Outer sleeve structure for fan, noise reduction device, and ventilation therapy apparatus

Abstract

An outer sleeve structure (5) for a fan (530), a noise reduction device, and a ventilation therapy apparatus. The outer sleeve structure (5) for a fan comprises a first fan sleeve (510) configured to cover a volute portion (531) of a fan (530). The fan (530) comprises a fan air inlet (533), a fan sleeve air inlet (512) is provided at one end of the first fan sleeve (510), the fan sleeve air inlet (512) corresponds to the fan air inlet (533), and the fan sleeve air inlet (512) is coaxial with the fan air inlet (533). A suspension structure (560) is provided on the surface on the side of the first fan sleeve (510) close to the fan sleeve air inlet (512), the suspension structure (560) extends outward from the surface of the first fan sleeve (510) in the axial direction of the first fan sleeve (510), and the suspension structure (560) comprises a limiting portion (562) configured to restrict the movement of the first fan sleeve (510) within a preset range when the first fan sleeve (510) is fixedly mounted.

Description

Fan outer cover structure, noise reduction device and ventilation therapy equipment Cross-reference to related applications

[0001] This application claims priority to Chinese application No. 202411382528.X filed on September 30, 2024, Chinese application No. 202411383922.5 filed on September 30, 2024, Chinese application No. 202423261947.6 filed on December 27, 2024, and Chinese application No. 202423133812.1 filed on December 18, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present specification relates to the technical field of ventilation therapy, in particular to a fan outer cover structure, a noise reduction device and a ventilation therapy equipment. BACKGROUND

[0003] Ventilation therapy equipment is a medical device that provides breathing gas to assist users in breathing, which effectively improves respiratory function by increasing lung ventilation, and is widely used in the treatment of respiratory system diseases such as respiratory failure, respiratory insufficiency, sleep apnea syndrome, and chronic obstructive pulmonary disease.

[0004] The equipment usually relies on a fan to generate ventilation gas with a certain treatment pressure. In actual operation, the fan runs at high speed, which may cause the motor to overheat, affecting the electrical safety and power stability of the equipment. The existing technology usually adds cooling components for heat dissipation, but this may lead to complex equipment structure and increased maintenance costs. At the same time, the fan generates high noise when running, and conventional noise reduction methods (e.g., wrapping sound-absorbing noise-reducing cotton) can suppress mechanical noise to some extent, but there is a risk of material aging and particle shedding, which may contaminate the flowing gas and endanger patient safety. In addition, the existing noise reduction structure has limited effect on noise suppression caused by breathing gas flow. During the patient's exhalation phase, the exhalation flow and the intake direction of the ventilation therapy equipment are opposite, and the two may cause airflow collision in the chamber, causing cavity resonance to produce "hollow noise", which seriously affects the patient's use experience.

[0005] Therefore, it is necessary to provide a fan outer cover structure, a noise reduction device and a ventilation therapy equipment that can effectively dissipate heat and comprehensively reduce noise for the ventilation therapy equipment and internal components without increasing the complexity of the overall structure. SUMMARY

[0006] One of the embodiments of the present specification provides a casing structure of a fan. The casing structure comprises a first fan casing configured to cover a volute portion of the fan, the fan comprising a fan inlet, the first fan casing having a fan casing inlet at one end, the fan casing inlet corresponding to the fan inlet, the fan casing inlet being coaxial with the fan inlet; wherein a surface of the first fan casing near a side of the fan casing inlet is provided with a hanging structure, the hanging structure extending outward along an axial direction of the first fan casing from the surface of the first fan casing, the hanging structure comprising a limiting portion configured to limit movement of the first fan casing within a preset range when the first fan casing is fixedly installed.

[0007] One of the embodiments of the present specification provides a noise reduction device of a ventilation therapy device. The noise reduction device comprises a first chamber, the first chamber being provided with an air inlet for receiving air; a second chamber configured to accommodate a fan; a third chamber, the fan inlet being exposed to the third chamber; the three chambers being arranged along an axial direction of the fan, the first chamber being in fluid communication with the second chamber, and the second chamber being in fluid communication with the third chamber; air entering from the air inlet can flow in the first chamber, the second chamber and the third chamber in sequence, and finally flow to the fan inlet.

[0008] One of the embodiments of the present specification provides a casing structure of a fan. The casing structure comprises a motor casing for covering a motor portion of the fan, the motor casing being internally structured with a cavity penetrating through the motor casing along an axial direction, the cavity being capable of accommodating the motor portion; a cooling inlet flow channel for flowing gas is formed between an inner wall of the cavity and an outer wall of the motor portion, the motor casing is further provided with a gas outlet portion, the cooling inlet flow channel is in fluid communication with the gas outlet portion, and the gas in the cooling inlet flow channel can flow to the outside of the motor casing through the gas outlet portion.

[0009] One of the embodiments of the present specification provides an air inlet structure of a ventilation therapy device. The air inlet structure comprises a gas passage in which a gas flow flows; and a gas resistance adjusting device provided in the gas passage, the gas resistance adjusting device being configured such that the gas resistance when the gas flow in the gas passage flows in a first direction is smaller than the gas resistance when an exhalation gas flow in the gas passage flows in a second direction, wherein the gas flow in the first direction and the gas flow in the second direction are gas flows in opposite directions.

[0010] One of the embodiments of the present specification provides a ventilation therapy device. The ventilation therapy device comprises an air inlet structure of a ventilation therapy device as described in the embodiments of the present specification.

[0011] One of the embodiments of the present specification provides a flow guiding device of a noise reduction device. The flow guiding device comprises a fluid chamber for fluid flow, the fluid chamber comprising a fluid inlet and a fluid outlet, the fluid chamber being configured such that fluid entering the fluid chamber from the fluid inlet exits the fluid chamber from the fluid outlet after at least one angular turn.

[0012] One of the embodiments of the present specification provides a noise reduction device. The noise reduction device comprises a flow guiding device as described in the embodiments of the present specification, the noise reduction device further comprising one or more noise reduction chambers, the flow guiding structure being disposed within any of the noise reduction chambers, or disposed between two of the noise reduction chambers for communicating the two noise reduction chambers.

[0013] One of the embodiments of the present specification provides a noise reduction device. The noise reduction device comprises a casing structure of a fan as described in the embodiments of the present specification.

[0014] One of the embodiments of the present specification provides a ventilation therapy device. The ventilation therapy device comprises a noise reduction device as described in the embodiments of the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present specification will be further described in the way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, in these embodiments, the same reference numbers represent the same structures, wherein:

[0016] Fig. 1 is a perspective view of an upper casing of a noise reduction device according to some embodiments of the present specification (viewed from above);

[0017] Fig. 2 and Fig. 3 are perspective views of an upper casing of a noise reduction device according to some embodiments of the present specification (viewed from below), respectively;

[0018] Fig. 4 is a perspective view of a noise reduction device according to some embodiments of the present specification;

[0019] Fig. 5 is a perspective view of a noise reduction device according to some embodiments of the present specification, wherein the upper casing is not shown;

[0020] Fig. 6 is a perspective view of a noise reduction device according to some embodiments of the present specification, wherein the middle casing is not shown;

[0021] Fig. 7a and Fig. 7b are perspective views of a middle casing according to some embodiments of the present specification, respectively;

[0022] Fig. 8 and Fig. 9 are cross-sectional views of a noise reduction device according to some embodiments of the present specification, respectively;

[0023] Fig. 10 is a perspective view of a noise reduction device according to some embodiments of the present specification;

[0024] Fig. 11 is a perspective view of a fan structure installed in a noise reduction device according to some embodiments of the present specification, wherein a first air inlet pipe is shown;

[0025] Fig. 12 is a cross-sectional view of a fan structure according to some embodiments of the present specification;

[0026] Fig. 13 is a perspective view of a fan structure installed in a noise reduction device according to some embodiments of the present specification, wherein a first air inlet pipe is not shown;

[0027] Fig. 14 is a perspective view of a fan structure installed in a noise reduction device according to some embodiments of the present specification, viewed from below;

[0028] Fig. 15 is a perspective view of a lower shell according to some embodiments of the present specification;

[0029] Fig. 16 is a perspective view of a noise reduction device according to some embodiments of the present specification, viewed from below, wherein a lower shell is not shown;

[0030] Fig. 17 is a perspective view of a noise reduction device according to some embodiments of the present specification, viewed from below, wherein a lower shell and a second partition are not shown;

[0031] Fig. 18 and Fig. 19 are perspective views of a fan structure according to some embodiments of the present specification, viewed from above;

[0032] Fig. 20 is a perspective view of a fan structure according to some embodiments of the present specification, viewed from below;

[0033] Fig. 21 is a top view of a fan structure according to some embodiments of the present specification;

[0034] Fig. 22 is a perspective cross-sectional view of a fan structure according to some embodiments of the present specification, wherein the grey portion is a cross-sectional line illustration;

[0035] Fig. 23 and Fig. 24 are perspective views of a motor casing according to some embodiments of the present specification, respectively;

[0036] Fig. 25 is a top view of a motor casing according to some embodiments of the present specification;

[0037] Fig. 26 is a cross-sectional view of Fig. 25 at A-A;

[0038] Fig. 27, Fig. 28a and Fig. 28b are perspective views of a first fan cover according to some embodiments of the present specification, respectively;

[0039] Figure 29a is a perspective view of a noise reduction structure, according to some embodiments of the present specification;

[0040] Figure 29b is a perspective view of a noise reduction structure, according to some embodiments of the present specification;

[0041] Figure 30a is a schematic view of a first fan cover over a fan, according to some embodiments of the present specification, showing the motor portion of the fan;

[0042] Figure 30b is a schematic view of a first fan cover over a fan, according to some embodiments of the present specification, showing the motor portion of the fan;

[0043] Figure 31a is a schematic view of a first fan cover over a fan, according to some embodiments of the present specification, viewed from below;

[0044] Figure 31b is a schematic view of a first fan cover over a fan, according to some embodiments of the present specification, viewed from the front;

[0045] Figure 32 is a perspective view of a first fan cover, according to some embodiments of the present specification, viewed from above;

[0046] Figure 33 is a perspective view of a first fan cover, according to some embodiments of the present specification, viewed from below;

[0047] Figure 34 is an enlarged view of Figure 33 at A;

[0048] Figure 35 is a schematic view of a sound deadening channel on a first fan cover, according to some embodiments of the present specification;

[0049] Figure 36 is a perspective schematic view of a noise reduction device, according to some embodiments of the present specification;

[0050] Figure 37 is an axial cross-sectional view of a noise reduction device, according to some embodiments of the present specification, without showing the impeller of the fan and the casing covering the impeller;

[0051] Figures 38 and 39a are perspective cross-sectional views of a noise reduction device, according to some embodiments of the present specification, without showing the impeller of the fan and the casing covering the impeller;

[0052] Figure 39b is a perspective cross-sectional view of a noise reduction device, according to some embodiments of the present specification, from another angle, without showing the impeller of the fan and the casing covering the impeller, with the greyed-out portion indicating the cross-section;

[0053] Figure 40 is a perspective schematic view of a noise reduction device, according to some embodiments of the present specification, without showing the upper casing;

[0054] Fig. 41 is a perspective view of a noise reduction device according to some embodiments of the present specification, without showing the upper shell;

[0055] Fig. 42a is a perspective view of a lower shell of a noise reduction device according to some embodiments of the present specification;

[0056] Fig. 42b is a perspective view of a lower shell of a noise reduction device according to some embodiments of the present specification, without showing the first partition;

[0057] Fig. 42c is a perspective view of a lower shell of a noise reduction device according to some embodiments of the present specification, after the first partition is installed, with the gray part showing the hatching of the cutaway;

[0058] Fig. 43 is a front view of a noise reduction device according to some embodiments of the present specification;

[0059] Fig. 44a is a cross-sectional view of Fig. 43 at B-B;

[0060] Fig. 44b is a cross-sectional view of Fig. 43 at C-C;

[0061] Fig. 45 is a schematic view of the cooperation between the limiting part and the hanging groove of a noise reduction structure according to some embodiments of the present specification;

[0062] Fig. 46 is a cross-sectional view of a lower shell of a noise reduction device according to some embodiments of the present specification;

[0063] Fig. 47 is a cross-sectional view of a lower shell of a noise reduction device according to some embodiments of the present specification, without showing the first partition;

[0064] Fig. 48 is a perspective view of a first partition of a noise reduction device according to some embodiments of the present specification, viewed from above;

[0065] Fig. 49 is a perspective view of a first partition of a noise reduction device according to some embodiments of the present specification, viewed from below;

[0066] Fig. 50 is a bottom view of a first partition of a noise reduction device according to some embodiments of the present specification;

[0067] Fig. 51a is a perspective view of a flange of a noise reduction device according to some embodiments of the present specification, viewed from above;

[0068] Fig. 51b is a perspective view of a sealing structure of a noise reduction device according to some embodiments of the present specification, viewed from below;

[0069] Fig. 51c is a perspective view of a sealing structure of a noise reduction device according to some embodiments of the present specification, viewed from above;

[0070] Figure 52 is a perspective cut view of a flange of a noise reduction device, according to some embodiments of the present specification;

[0071] Figure 53 is a perspective structural schematic view of an upper shell of a noise reduction device from a lower side, according to some embodiments of the present specification;

[0072] Figure 54 is a perspective structural schematic view of an upper shell of a noise reduction device from a lower side, according to some embodiments of the present specification, wherein a first partition is not shown;

[0073] Figure 55 is a perspective structural schematic view of an upper shell of a noise reduction device from a lower side, according to some embodiments of the present specification, wherein a first partition and a noise reduction structure are not shown;

[0074] Figure 56 is a perspective structural schematic of a ventilation therapy device, according to some embodiments of the present specification;

[0075] Figure 57 is a cut view of a ventilation therapy device, according to some embodiments of the present specification;

[0076] Figure 58 is a top view of an air intake structure of a ventilation therapy device installed in the ventilation therapy device, according to some embodiments of the present specification, wherein an air resistance adjustment device is in a closed state;

[0077] Figure 59 is a perspective cut view of an air intake structure of a ventilation therapy device installed in the ventilation therapy device, according to some embodiments of the present specification, wherein an air resistance adjustment device is in a closed state;

[0078] Figure 60 is a perspective structural schematic of an air resistance adjustment device shown in 58;

[0079] Figure 61 is a top view of an air intake structure of a ventilation therapy device installed in the ventilation therapy device, according to some embodiments of the present specification, wherein an air resistance adjustment device is in an open state;

[0080] Figure 62 is a perspective cut view of an air intake structure of a ventilation therapy device installed in the ventilation therapy device, according to some embodiments of the present specification, wherein an air resistance adjustment device is in an open state;

[0081] Figure 63 is a perspective structural schematic view of a flow guide structure from an upper side, according to some embodiments of the present specification, wherein a fluid port is a fluid outlet;

[0082] Figure 64 is a perspective structural schematic view of a flow guide structure from a lower side, according to some embodiments of the present specification, wherein a fluid port is a fluid outlet;

[0083] Figure 65 is a perspective structural schematic view of a flow guide structure from an upper side, according to some embodiments of the present specification, wherein a fluid port is a fluid inlet;

[0084] Fig. 66a and Fig. 66b are perspective cross-sectional views of a flow guiding structure, according to some embodiments of the present specification;

[0085] Fig. 67 is a perspective cross-sectional view of a flow guiding structure, according to some embodiments of the present specification, in which both ends of the flow guiding tube are open ends;

[0086] Fig. 68 is a perspective cross-sectional view of a flow guiding structure, according to some embodiments of the present specification, in which one end of the flow guiding tube is an open end and the other end is a closed end;

[0087] Fig. 69 is a perspective cross-sectional view of a flow guiding structure, according to some embodiments of the present specification, in which both ends of the flow guiding tube are open ends and the first fluid port and the second fluid port are staggered with respect to each other;

[0088] Fig. 70a, Fig. 70b and Fig. 70c are perspective cross-sectional views of a flow guiding structure, according to some embodiments of the present specification, in which one end of the flow guiding tube is an open end and the other end is a closed end and the first fluid port and the second fluid port are staggered with respect to each other;

[0089] Fig. 71 is a perspective view of a noise reduction device, according to some embodiments of the present specification;

[0090] Fig. 72 is a cross-sectional view of a noise reduction device, according to some embodiments of the present specification;

[0091] Fig. 73 is a top view of a lower shell of a noise reduction device, according to some embodiments of the present specification;

[0092] Fig. 74 is a perspective view of a noise reduction device, according to some embodiments of the present specification, in which the upper shell is not shown;

[0093] Fig. 75 is a front view of a noise reduction device, according to some embodiments of the present specification, in which the upper shell is not shown;

[0094] Fig. 76 is a top view of a noise reduction device, according to some embodiments of the present specification, in which the upper shell is not shown;

[0095] Fig. 77 is a cross-sectional view of a noise reduction device, according to some embodiments of the present specification, in which the upper shell is not shown.

[0096] Reference signs:

[0097] 1. upper shell;

[0098] 10. shell side wall; 11. air outlet;

[0099] 110. first gas chamber;

[0100] 120, second gas chamber; 121, second gas inlet;

[0101] 130, mixing baffle; 131, baffle piece; 132, mixing chamber; 133, baffle opening;

[0102] 1311, first baffle piece; 1312, second baffle piece; 1331, first baffle opening; 1332, second baffle opening;

[0103] 141, first baffle; 142, second baffle; 143, reinforcing / flow guiding structure; 144, inclined surface;

[0104] 2, middle shell;

[0105] 21, air inlet; 221, first flow channel;

[0106] 210, first partition; 220, mounting hole; 230, annular baffle; 240, air outlet; 234, inflow flow channel; 235, connecting groove; 236, resonance cavity inlet; 237, air outlet hole;

[0107] 250, first gas inlet; 260, third gas inlet; 270, first chamber; 280, second chamber;

[0108] 3, lower shell;

[0109] 310, flow guiding cone; 320, resonance cavity; 330, third chamber; 31, flange; 311, suspension groove; 312, trapezoidal groove; 313, flow guiding piece; 314, trapezoidal boss; 315, mounting groove; 316, first center hole;

[0110] 4, first gas inlet pipe; 410, first end; 420, second end; 411, notch;

[0111] 5, outer sleeve structure (or noise reduction structure, noise reduction shell);

[0112] 510, first fan sleeve; 520, second fan sleeve (motor sleeve); 521, second groove; 530, fan (or fan assembly); 540, cooling inflow passage; 550, third fan sleeve;

[0113] 560, suspension structure; 570, support structure; 571, first groove; 572, sound absorbing hole;

[0114] 511, buffer structure; 512, fan sleeve air inlet; 513, fan sleeve air outlet;

[0115] 522, cavity; 523, support part; 524, recessed part; 525, protrusion; 526, guide inclined surface;

[0116] 531, volute portion; 532, motor portion; 533, fan air inlet; 534, fan air outlet;

[0117] 561, lifting lug; 562, limiting portion (or fixing portion); 563, mounting guide portion; 564, anti-skid operation structure; 565, mating end face;

[0118] 6, sealing structure; 61, hanging mating face; 62, clamping boss; 63, second center hole; 64, air outlet baffle; 65, ventilation opening;

[0119] 7, flow guide device; 71, flow guide pipe; 711, first flow guide pipe; 712, second flow guide pipe; 713, flow guide inclined surface; 72, second partition plate; 73, flow guide body; 731, fluid hole; 7311, first fluid hole; 7312, second fluid hole; 74, first flow guide structure; 75, second flow guide structure; 76, fluid chamber; 77, covering element; 78, first end of flow guide body 73; 79, second end of flow guide body 73;

[0120] 71-1, first end of flow guide pipe 71; 71-2, second end of flow guide pipe 71; 77-1, first end of covering element; 77-2, second end of covering element;

[0121] 8, flow monitoring device;

[0122] 9, gas passage; 91, limiting member;

[0123] 1000, air resistance adjusting device; 1010, one-way valve piece; 1020, rotating shaft; 1030, connecting portion;

[0124] 1100, ventilation therapy device. DETAILED DESCRIPTION

[0125] The exemplary embodiments or implementations will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar elements, unless otherwise represented. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0126] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0127] It should be understood that the use of "first", "second", and "third" words in the present application specification and claims do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limitation, but represent the existence of at least one. Unless otherwise indicated, "front", "back", "lower" and / or "upper" and similar words are only for convenience of description, and are not limited to a position or spatial orientation. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects.

[0128] One of the embodiments of the present specification provides a casing structure of a fan.

[0129] The fan 530 refers to the core power component of the ventilation therapy device, which is used to provide controllable airflow and pressure for the ventilation therapy device. In some embodiments, as shown in FIGS. 29a-35, the fan 530 includes a motor (or motor part) 532 and a volute (or volute part) 531. The volute 531 includes an impeller and a housing. The motor part 532 is connected with the impeller to drive the impeller to rotate. The volute 531 at least surrounds the outside of the impeller. In some embodiments, as shown in FIGS. 31a and 31b, the fan 530 further includes a fan air inlet 533. For example, the fan air inlet 533 can be located at the bottom end of the fan axial direction (the direction D shown in FIG. 32). In some embodiments, as shown in FIG. 32, the fan 530 further includes a fan air outlet 534. For example, the circumferential side of the fan 530, i.e., the tangential direction of the circumference, has the fan air outlet 534.

[0130] The casing structure 5 refers to the protective and functional integrated assembly covering the fan, which is used to realize the protection, vibration reduction, noise reduction and airflow guiding / cooling functions of the fan.

[0131] In some embodiments, as shown in FIGS. 18-21, 27-35, the casing structure 5 includes a first fan cover 510. The first fan cover refers to the housing member covering the volute of the fan, which is used to accommodate and fix the volute of the fan, and realize the overall fixation and vibration reduction and noise reduction of the fan assembly. The first fan cover 510 can be made of various materials. For example, the first fan cover 510 can be made of flexible material (for example, silicone material, etc., to realize the functions of vibration reduction and noise reduction, facilitate deformation and thus facilitate installation, etc.).

[0132] In some embodiments, the first fan cover 510 covers at least a portion of the fan 530. In some embodiments, the first fan cover 510 is configured to cover the volute portion 531 of the fan 530. As shown in FIGS. 30a and 30b, the first fan cover 510 can partially cover the volute 531 of the fan 530 or completely cover the volute 531 of the fan 530.

[0133] In some embodiments, as shown in FIGS. 17, 20, 28a, 28b, 32 and 33, one end of the first fan cover 510 is provided with a fan cover air inlet 512. The fan cover air inlet 512 corresponds to the fan air inlet 533, and the fan cover air inlet 512 is coaxial with the fan air inlet 533 (for example, the axial direction D shown in FIG. 32). Specifically, as shown in FIG. 33, the fan cover air inlet 512 is located at one end of the first fan cover 510 (for example, the bottom end of the corresponding installation position when the first fan cover is normally working, etc.), and the fan cover air inlet 512 is in communication with the space inside the first fan cover 510 for accommodating the fan 530. The gas outside the first fan cover 510 can enter the fan 530 through the fan cover air inlet 512 and the fan air inlet 533.

[0134] It can be understood that, on the one hand, the first fan cover 510 can position the fan 530; on the other hand, the first fan cover 510 can also fix the fan 530, thereby playing a role in reducing vibration and noise when the fan 530 is working. When the ventilation treatment device is subjected to external impact or accidental falling, the first fan cover 510 covering the outside of the fan 530 can also play a role in resisting impact and preventing collision, thereby protecting the fan 530, and the limiting portion 562 (see below) on the first fan cover 510 can enable the fan 530 to be kept at the designed installation position without being damaged.

[0135] In some embodiments, as shown in FIGS. 28a and 32, the surface of the first fan cover 510 near the side of the fan cover air inlet is provided with a hanging structure 560. The hanging structure refers to a component for achieving suspension and fixation, which is used to achieve the function of suspension load bearing to ensure the normal installation of the fan assembly. It can be understood that, when the fan 530 is in the normal working position, the fan air inlet 533 is located at the bottom end of the whole fan 530, and therefore the fan cover air inlet 512 covering the fan air inlet 533 is located at the bottom end side of the first fan cover 510, i.e., the side of the first fan cover 510 near the fan cover air inlet.

[0136] In some embodiments, the hanging structure 560 extends outward from the surface of the first fan cover 510 along the axial direction (for example, the axial direction D shown in FIG. 32) of the first fan cover 510. The hanging structure 560 and the first fan cover 510 can be a split structure (i.e., a detachable structure) or an integrally formed structure.

[0137] In some embodiments, the suspension structure 560 comprises a limiting portion (or fixing portion) 562. The limiting portion refers to a component that limits the movement of the position, and is used to achieve a safety locking function to prevent the fan assembly from being forced out. The limiting portion 562 is configured to limit the movement of the first fan cover 510 within a predetermined range when the first fan cover 510 is fixedly installed.

[0138] In some embodiments, as shown in FIG. 28a and FIG. 32, the surface of the first fan cover 510 near the side of the fan cover air inlet 512 is provided with a support structure 570. The support structure refers to a component that achieves support and bearing, and is used to bear the fan and absorb vibration. The support structure 570 can be in various shapes. For example, the support structure 570 can be a buffer flange, a buffer edge, or the like structure protruding from the surface of the first fan cover 510. For another example, the support structure 570 can be a part of the end surface on the surface of the first fan cover 510. The support structure 570 can be made of flexible material.

[0139] In some embodiments, the support structure 570 extends outward along the axial direction of the first fan cover 510 from the surface of the first fan cover 510. In some embodiments, when the first fan cover 510 is fixedly installed, the free end of the support structure 570 can be in contact with the installation surface of the first fan cover 510.

[0140] In some embodiments, as shown in FIG. 13 and FIG. 28a, the first fan cover 510 is used to be installed on the second partition plate 72 described later, and thus the suspension structure 560 and the support structure 570 are respectively used to cooperate with the second partition plate 72.

[0141] In some embodiments, the support structure 570 is configured to abut against the hanging matching surface 61 (see below, which can also be the end surface of the second partition plate 72). It can be understood that, when the fan 530 is normally installed and used, the volute 531 is located below the overall fan 530, and the heavier motor part 532 is located above the overall fan 530, so that the fan 530 wrapped by the first fan cover 510 has a downward movement tendency due to gravity when fixedly installed. At this time, the support structure 570 located above the fan cover air inlet 512 will abut against the hanging matching surface 61 (which can also be the end surface of the second partition plate 72) of the first fan cover 510 under the gravity of the fan 530, thereby buffering and supporting the fan 530. Compared with the mode of directly abutting the end surface of the lower half of the first fan cover 510 against the hanging matching surface 61, in the embodiment of the present specification, a rim structure protruding from the surface of the first fan cover 510 and extending along the axial direction of the first fan cover 510 is arranged in the lower half of the first fan cover 510 as the support structure 570, which can make the first fan cover 510 and the hanging matching surface 61 indirectly contact through the support structure 570 of flexible material, effectively buffer the vibration generated during the operation of the fan 530, avoid the transmission of vibration to the hanging matching surface 61, thereby reducing the noise of the fan operation and improving the noise reduction effect.

[0142] In some embodiments, the hanging structure 560 and the support structure 570 extend in the same direction (i.e., the hanging structure 560 and the support structure 570 extend in the same direction along the axial direction of the first fan cover 510 from the surface of the first fan cover 510, as shown by the dotted line D in FIG. 32), and the axial extension length of the hanging structure 560 is greater than the axial extension length of the support structure 570, so that the end of the hanging structure 560 extends beyond the fan cover air inlet 512 and is located below the fan cover air inlet 512, and the end of the support structure 570 is located above the fan cover air inlet 512.

[0143] In some embodiments, as shown in FIG. 28a, the number of hanging structures 560 is at least two, and the at least two hanging structures 560 are arranged at intervals along the circumferential direction of the first fan cover 510. For example, FIG. 33 shows an embodiment in which three hanging structures 560 are arranged at equal intervals along the circumferential direction of the first fan cover 510. In some embodiments, the support structure 570 is located between the hanging structures 560 along the circumferential direction of the first fan cover 510. It can be understood that, when the support structure 570 is located between the at least two hanging structures 560, it is essentially a bottom wall structure of the first fan cover 510 between the two hanging structures 560. In some embodiments, the length of the hanging structure 560 extending along the axial direction from the surface of the first fan cover 510 is greater than the axial extension length of the support structure 570.

[0144] In some embodiments, as shown in FIG. 28a, the axial end surface of the support structure 570 has one or more sound-absorbing channels. The sound-absorbing channel refers to a structure that absorbs sound, which is used to reduce the noise of the air flow during the operation of the device. In some embodiments, the sound-absorbing channel is in communication with the chamber inside the first fan cover 510, i.e., the volute portion 531 in which the fan 530 is installed.

[0145] In some embodiments, as shown in FIGS. 28a-28b, the sound-absorbing channel can be provided as a groove or a sound-absorbing hole 572 on the support structure 570. For example, the sound-absorbing channel can be the first groove 571 on the support structure 570, or can be regarded as a space jointly defined by the first groove 571 and the surface (e.g., the second partition plate 72 described below, etc.) abutting against the support structure 570. For another example, the sound-absorbing channel can be the sound-absorbing hole 572 (exemplarily, a hole structure provided on the axial side wall of the support structure 570, etc.) on the support structure 570. As shown in FIG. 35, the first groove 571 is provided on the axial end surface of the support structure 570, and the first groove 571 extends along the axial direction of the first fan cover 510. By providing the first groove 571 on the support structure 570, a gap (i.e., the sound-absorbing channel) is formed between the axial end surface of the support structure 570 and the flat surface (e.g., the suspension matching surface 61 described below, etc.) cooperating therewith. In some embodiments, the width of the first groove 571 can be 0.1 mm to 20 mm. Preferably, the width of the first groove 571 (i.e., the dimension of the first groove 571 along the radial direction of the first fan cover 510) can be 1 mm. In some embodiments, the height of the first groove 571 (i.e., the dimension of the first groove 571 along the axial direction of the first fan cover 510) can be 0.1 mm to 20 mm. Preferably, the height of the first groove 571 can be 5 mm. In some embodiments, the length of the first groove 571 (i.e., the dimension of the groove along the circumferential direction of the first fan cover 510) can be 5 mm to 11 mm. Preferably, the length of the first groove 571 can be 8 mm. By limiting the dimensions of the aforementioned first groove 571, the air flow can pass through the first groove 571 without affecting the air volume of the fan 530.

[0146] In some embodiments, when the first fan cover 510 is fixedly installed, the air flow enters the fan inlet 533 through the sound-absorbing channel. The noise reduction principle of the sound-absorbing channel is based on the sound wave interference effect. It can be understood that the main air flow flows along the outer side of the first fan cover 510 to the fan cover inlet 512 at the bottom side of the first fan cover 510, and then enters the fan 530 through the fan inlet 533; at the same time, part of the branch air flow directly enters the fan 530 through the fan inlet 533 through the sound-absorbing channel. Since the path lengths of the main air flow and the branch air flow are different, the sound waves of the main air flow and the sound waves of the branch air flow will have a phase difference of about 1 / 4 wavelength when they converge, so that the two sound waves superimpose and interfere with each other, achieving the purpose of noise reduction.

[0147] In some embodiments, the number of sound-damping channels can be one or more. For example, one or more first grooves 571 can be arranged on the support structure 570 between every two suspension structures 560, one or more first grooves 571 can be arranged on the support structure 570 between any two suspension structures 560, and the like.

[0148] Further, since the suspension structure 560 includes the limiting portion 562, the support structure 570 and the limiting portion 562 can be respectively matched and fixed to the first fan cover 510 from opposite sides of the first fan cover 510 when the first fan cover 510 is fixed.

[0149] In some embodiments, as shown in FIGS. 33 and 34, the suspension structure 560 includes a lug 561 extending along the axial direction of the first fan cover 510. The lug 561 refers to a hoisting connection carrier between components, and as a core force receiving component of the suspension structure 560, it is used to transmit the weight of the fan to the equipment shell and guide the installation direction.

[0150] The lug 561 can have various shapes and structures. In some embodiments, the lug 561 has an arc-shaped structure. For example, the lug 561 can be configured as an arc-shaped structure having the same circumferential profile as the first fan cover 510, i.e., the arc-shaped lug is an arc-shaped sheet structure that is curved away from the air inlet 512 of the fan cover.

[0151] In some embodiments, as shown in FIG. 34, the limiting portion is arranged on both sides of the lug 561 (e.g., both sides of the lug 561 in the extension direction, etc.) and protrudes from the surface of the lug 561.

[0152] In some embodiments, the limiting portion 562 can be arranged as a baffle structure extending obliquely from the surface of the lug 561 in a direction away from the free end of the lug 561. For example, the limiting portion 562 can be arranged as a horn-shaped baffle structure that gradually opens in a direction toward the second partition 72 described below, and the like. In some embodiments, the limiting portion 562 can also be arranged as a rectangular bar structure protruding from the surface of the lug 561, and the like.

[0153] When installing, as shown in FIG. 45, the lug 561 can be inserted into the hole or groove (for example, the hanging groove 311 described below, etc.) matched therewith from top to bottom, and since there is a gap space between the limiting portion 562 and the surface of the lug 561, the gap space can facilitate the deformation of the limiting portion 562, so that the limiting portion 562 can pass through the aforementioned hole or groove together with the lug 561 and be located below the aforementioned hole or groove. As shown in FIG. 34, the end face of the limiting portion 562 close to the air inlet 512 of the fan cover is a matching end face 565, and after the aforementioned installation is completed, the matching end face 565 is located below the second partition plate 72 (which can also be the second partition plate 72 of the flow guide device 7) where the aforementioned hole or groove is located. And since the limiting portion 562 is arranged in a horn-shaped baffle structure that gradually opens in the direction towards the second partition plate 72 (that is, the horizontal distance between the pair of limiting portions 562 on both sides of the lug 561 gradually decreases with the increase of the vertical distance from the second partition plate 72, which can also be understood as the closer to the second partition plate 72, the greater the horizontal distance between the pair of limiting portions 562), when the fan 530 and the first fan cover 510 move upward, the matching end face 565 of the horn-shaped baffle structure of the limiting portion 562 contacts the surface of the second partition plate 72, and further deforms under the action of the upward traction force, so that the horizontal distance between the pair of limiting portions 562 is further expanded, thereby preventing the lug 561 from being pulled out of the gap of the aforementioned hole or groove upward, avoiding the situation that the fan 530 moves upward and is pulled out, etc.

[0154] In some embodiments, as shown in FIG. 28a and FIG. 20, the free end of the lug 561 is provided with an installation guide portion 563. The installation guide portion 563 can be a round corner, a chamfer, etc. structure, so that the insertion operation can make the lug 561 more smoothly inserted into the hole or groove matched therewith. In some embodiments, the surface of the installation guide portion 563 is provided with an anti-skid operation structure 564. The anti-skid operation structure 564 can be a structure protruding outward from the surface of the lug 561, for example, an anti-skid protrusion, an anti-skid protruding strip, etc.

[0155] When the lug 561 is inserted into the hole or groove matched therewith, correspondingly, the support structure 570 abuts against the plane (for example, the hanging matching surface 61 described below, etc.) where the hole or groove is located from above, and therefore, the first fan cover 510 is supported by the support structure 570 above the plane (for example, the hanging matching surface 61 described below, etc.) where the first fan cover 510 is installed.

[0156] In some embodiments, as shown in FIG. 29b, the first fan cover 510 is provided with a flexible buffer structure 511 on the side away from the fan cover air inlet 512. The buffer structure 511 extends along the axial direction of the first fan cover 510 from the surface of the first fan cover 510, and the extension direction of the buffer structure 511 is opposite to the extension direction of the suspension structure 560. When the first fan cover 510 is installed on the fan 530, the top end of the free end of the buffer structure 511 is higher than the top end of the motor part 532 of the fan. The buffer structure refers to a component that achieves shock absorption, and is used to protect the motor and prevent damage to the motor. In some embodiments, the buffer structure 511 has various shapes. For example, the buffer structure 511 can be a support column or the like.

[0157] In some embodiments, the number of buffer structures 511 is at least two, and the at least two buffer structures 511 are arranged at intervals along the circumferential direction of the first fan cover 510 and surround the motor part 532 of the fan 530. The at least two buffer structures 511 extend along the axial direction of the first fan cover 510 from the side of the first fan cover 510 away from the fan cover air inlet 512, and extend beyond the end of the motor part 532 of the fan 530. The buffer structure 511 can not contact the fan 530, but only surrounds the fan 530 in the circumferential direction and is higher than the end of the fan 530 in the axial direction, forming a structure surrounding the motor part 532. When the ventilation treatment device is subjected to external impact or accidental falling, the buffer structure 511 can resist impact and prevent collision on the motor part 532 of the fan 530, thereby protecting the fan 530, so that the fan 530 can remain in the designed installation position without being damaged, or reduce damage caused by falling impact in the uninstalled state.

[0158] In some embodiments, the buffer structure 511 and the first fan cover 510 are a split structure or an integrally formed structure.

[0159] In some embodiments, the outer cover structure 5 can further include a second fan cover 520. The second fan cover 520 refers to a cover structure that covers the motor of the fan, and is used to absorb the vibration and noise generated by the operation of the motor and protect the normal operation of the motor. The second fan cover 520 can be made of various materials. For example, the second fan cover 520 can be made of a flexible material (for example, a silicone material or the like), so as to achieve the functions of vibration reduction and noise reduction, facilitate deformation and thus facilitate installation, and the like.

[0160] In some embodiments, as shown in FIGS. 8-10, 29a, the second fan cover 520 is disposed on a side of the first fan cover 510 distal to the fan cover air inlet 512 (e.g., the second fan cover 520 can be disposed axially above the first fan cover 510, etc.), and the second fan cover 520 is configured to cover the motor portion 532 of the fan 530 (e.g., the motor portion 532 of the fan 530, etc.). It can be understood that the second fan cover 520 covers the outside of the motor portion, thereby playing a role in reducing vibration and noise when the fan 530 is working. At the same time, when the ventilation treatment device is subjected to external impact or accidental falling, the second fan cover 520 covering the outside of the motor portion can also play a role in resisting impact and preventing collision for the fan 530, thereby protecting the fan 530 so that it can remain in the designed installation position without being damaged.

[0161] In some embodiments, the second fan cover 520 and the first fan cover 510 are in a split structure or an integrally formed structure. When the second fan cover 520 and the first fan cover 510 are in a split structure, the second fan cover 520 can be fixedly connected to the first fan cover 510, or the second fan cover 520 can be fixedly connected to the motor portion 532 of the fan 530.

[0162] In some embodiments, the buffer structure 511 can be disposed on the outside (in the radial direction of the second fan cover 520) of the second fan cover 520. For example, at least two buffer structures 511 are disposed at intervals along the circumference of the second fan cover 520 and surround the second fan cover 520. In some embodiments, the buffer structure 511 can also be omitted (e.g., in the case where the second fan cover 520 is provided).

[0163] In some embodiments, as shown in FIGS. 18-19, 21-22, and 23-26, the inside of the second fan cover 520 is provided with a cavity 522 extending through the second fan cover 520 in the axial direction, and the cavity 522 is capable of accommodating the motor portion 532 of the fan 530.

[0164] In some embodiments, the inner wall of the cavity 522 and the outer wall of the motor portion 532 form a cooling inlet channel 540 for flowing gas, and the second fan cover 520 is further provided with a gas outlet portion, the cooling inlet channel 540 is in fluid communication with the gas outlet portion, and the gas in the cooling inlet channel 540 can flow to the outside of the second fan cover 520 through the gas outlet portion. The cooling inlet channel 540 refers to an auxiliary channel for introducing external fluid, which is used to guide the fluid to flow through the surface of the motor to achieve motor cooling and airflow preheating. The gas outlet portion refers to an airflow outlet structure, which is used to guide the airflow flowing through the motor in the cooling inlet channel 540 to flow normally, thereby ensuring normal airflow. It can be understood that, since the cavity 522 penetrates through the second fan cover 520, the upper end of the cavity 522 is an open end, and the gas can enter the cooling inlet channel 540 from the upper end thereof and flow along the cooling inlet channel 540, so that the gas can exchange heat with the motor portion 532, and thus the heat of the motor portion 532 can be taken away by the gas during the flow process, thereby achieving the purpose of cooling the motor portion 532.

[0165] In some embodiments, the gas outlet portion includes one or more second grooves 521, which are arranged at the end of the second fan cover 520 close to the first fan cover 510 along the axial direction of the second fan cover 520, and extend along the axial direction of the second fan cover 520 and are spaced apart in the circumferential direction of the second fan cover 520. The gas in the cooling inlet channel 540 can flow to the outside of the second fan cover 520 through the one or more second grooves 521. As shown in FIGS. 18-19 and 24-25, the gas outlet portion includes one or more second grooves 521 arranged at the end of the second fan cover 520, and each second groove 521 is located between two adjacent support portions 523 (see the related content described later). The plurality of second grooves 521 extend along the axial direction of the second fan cover 520 and are spaced apart in the circumferential direction of the second fan cover 520, and each of the plurality of second grooves 521 is in fluid communication with the cooling inlet channel 540, so that the gas in the cooling inlet channel 540 can flow to the outside of the second fan cover 520 through the second grooves 521. It can be understood that, on the one hand, the gas can take away part of the heat of the motor portion 532 during the flow process, thereby achieving the cooling effect; on the other hand, the cooling inlet channel 540 can arrange and guide the flow of the gas, thereby also achieving the noise reduction effect.

[0166] In some embodiments, as shown in FIG. 23, the inner wall of the cavity 522 is provided with support portions 523, which are structural components for providing radial or axial support to ensure the stability of the fan components during operation. The support portions 523 are configured to contact the outer wall of the motor portion 532 to support the motor portion 532. In some embodiments, as shown in FIG. 18, the support portions 523 and the inner wall of the cavity 522 collectively form the cooling inflow channels 540 for the gas flow, i.e., the cooling inflow channels 540 can be collectively defined by the inner wall of the cavity 522, the side walls of two adjacent support portions 523, and the outer wall of the motor portion 532. It can be understood that the number of cooling inflow channels 540 corresponds to the number of support portions 523, and the cooling inflow channels 540 extend along the axial direction of the cavity 522.

[0167] In some embodiments, as shown in FIGS. 25 and 26, the support portions 523 protrude inwardly along the radial direction of the cavity 522 from the inner wall of the cavity 522, and the support portions 523 extend along the axial direction of the cavity 522. In some embodiments, the support portions 523 can extend along the axial direction of the cavity 522 in various shapes. As shown in FIG. 23, the support portions 523 can extend linearly along the axial direction of the cavity 522, and the cooling inflow channels 540 defined by the support portions 523 and the inner wall of the cavity 522 are straight channels extending along the axial direction of the cavity 522, and the gas in the cooling inflow channels 540 flows along the axial direction of the cavity 522 through the outer wall of the motor portion 532. For another example, the support portions 523 can also extend helically along the axial direction of the cavity 522, and the cooling inflow channels 540 defined by the support portions 523 and the inner wall of the cavity 522 are helical channels extending helically along the axial direction of the cavity 522, and the gas in the cooling inflow channels 540 can flow helically along the axial direction of the cavity 522 through the outer wall of the motor portion 532. It can be understood that the helically extending cooling inflow channels 540 can increase the surface area of the motor portion 532 through which the gas flows, thereby having a better cooling effect. In some embodiments, as shown in FIGS. 25 and 26, the support portions 523 are further provided with recessed portions 524 recessed inwardly along the radial direction of the cavity 522. By providing the recessed portions 524, the contact area between the support portions 523 and the motor portion 532 is reduced, and heat dissipation grooves are formed between the support portions 523 and the motor portion 532, thereby further facilitating the reduction of the temperature of the motor portion 532.

[0168] In some embodiments, the number of support portions 523 is at least two, and the at least two support portions 523 are spaced along the circumference of the cavity 522, so that the motor portion 532 can be supported from at least two radial directions to ensure stability. As shown in FIG. 25, four support portions 523 are equally spaced along the circumference of the cavity 522. It can be understood that, on the one hand, the equally spaced support portions 523 can facilitate processing; on the other hand, the support portions 523 can form four uniform cooling inlet channels 540 therebetween, so that the gas can flow uniformly over the surface of the motor portion 532, so that the motor portion 532 can be uniformly cooled to ensure the performance of the motor portion 532.

[0169] In some embodiments, as shown in FIGS. 23 and 24, the support portion 523 is provided with a guide slope 526 inclined toward the center of the cavity 522 at the two ends of the cavity 522 in the axial direction. The guide slope 526 can guide the motor portion 532 to smoothly enter the cavity 522. It can be understood that, as shown in FIG. 23, the guide slope 526 of the upper end of the support portion 523 is inclined downward; as shown in FIG. 24, the guide slope 526 of the lower end of the support portion 523 is inclined upward. The guide slope 526 of the upper end of the support portion 523 can guide and direct the gas flow; in addition to the function of guiding the gas flow, the guide slope 526 of the lower end of the support portion 523 can also function as an installation guide when the motor portion 532 is installed into the cavity 522.

[0170] In some embodiments, as shown in FIGS. 24 and 26, the outer wall of the second fan cover 520 is further provided with a plurality of annular protrusions 525. As shown in FIG. 10, the protrusions 525 are used to abut against the inner wall of the mounting hole 220, so as to reduce the contact area between the outer side of the second fan cover 520 and the inner wall of the mounting hole 220, so that the second fan cover 520 can be more easily installed into the mounting hole 220.

[0171] In some embodiments, as shown in FIG. 18, after the first fan cover 510 is wrapped around the volute portion 531 of the fan 530, the bottom end of the second fan cover 520 can abut against the end face of the volute portion 531, so that each second groove 521 of the bottom end of the second fan cover 520 cooperates with the end face of the volute portion 531 to define a gas outflow channel (gas outlet portion), that is, the gas in the cooling inlet channel 540 can flow to the outside of the second fan cover 520 through the gas outflow channel.

[0172] In some embodiments, as shown in FIG. 32, the outer sleeve structure 5 can further include a third fan sleeve 550 configured to cover the fan air outlet 534. The third fan sleeve 550 refers to a sleeve structure covering the fan air outlet, used to reduce the noise generated by the high-speed flow of the air outlet airflow. The third fan sleeve 550 can be made of various materials. For example, the third fan sleeve 550 can be made of a flexible material (e.g., silicone material, etc.) to achieve the functions of vibration reduction and noise reduction, facilitate deformation to facilitate installation, etc. It can be understood that since the outer side of the fan air outlet 534 is covered with the third fan sleeve 550 having vibration buffering and connecting sealing functions, and the end of the third fan sleeve 550 has an opening, which can form a fan sleeve air outlet 513, the fan sleeve air outlet 513 is wrapped around the outer side of the fan air outlet 534, and the fan sleeve air outlet 513 is coaxial with the fan air outlet 534. In some embodiments, the gas can be output to the outside of the first fan sleeve 510 and its application noise reduction device through the fan air outlet 534 and the fan sleeve air outlet 513.

[0173] In some embodiments, the first fan sleeve 510 and the third fan sleeve 550 can be a split structure or an integrally formed structure. The third fan sleeve 550 and the inside of the first fan sleeve 510 form a space communication structure for accommodating the fan 530, i.e., the first fan sleeve 510 and the third fan sleeve 550 accommodate a part of the fan 530 respectively, and FIG. 32 shows that the fan air outlet 534 is located in the third fan sleeve 550. The fan air outlet 534 and the fan sleeve air outlet 513 can also adopt other corresponding installation forms.

[0174] In some embodiments of the present specification, by providing the outer sleeve structure 5 of the fan, the following effects can be achieved:

[0175] 1. The motor part 532 and the volute part 531 of the fan 530 are fixed, thereby playing a positioning role for the fan 530;

[0176] 2. It plays a role in resisting impact and falling, thereby protecting the motor part 532 of the fan 530, and ensuring that the motor part 532 is located at the designed installation position without being damaged;

[0177] 3. It plays a role in reducing vibration and noise, and a role in arranging and guiding airflow, especially forming airflow with a phase difference at the first fan sleeve 510, and using the principle of superposition and interference of sound waves to achieve the purpose of noise reduction;

[0178] 4. The motor part 532 of the fan 530 is cooled, especially the motor part 532 is cooled by the gas flowing in the casing structure 5 (the gas is used to provide the patient with breathing gas) when the casing structure 5 is working, and thus the casing structure 5 and the noise reduction device to which the casing structure 5 is applied can be simplified without additional cooling devices or components such as cooling and heat dissipation structures.

[0179] 5. The gas flowing in the casing structure 5 is preheated by the heat of the motor part 532, and the casing structure 5 has the dual functions of cooling and preheating.

[0180] One of the embodiments of the present specification provides a noise reduction device. The noise reduction device refers to a component that realizes a noise control function and is used to suppress the noise of a ventilation therapy device. In some embodiments, the noise reduction device can include the casing structure 5 of the fan as described in the embodiments of the present specification.

[0181] One of the embodiments of the present specification provides a ventilation therapy device. The ventilation therapy device refers to a medical device that assists or replaces the breathing of a patient and is used to realize a "gas flow generation-treatment-delivery" process to provide the patient with ventilation gas meeting certain requirements (such as a specific pressure, flow rate, or oxygen concentration). The ventilation therapy device includes a high-flow humidified oxygen therapy device or a ventilator. The ventilation therapy device can include the noise reduction device described above.

[0182] One of the embodiments of the present specification provides a noise reduction device of a ventilation therapy device.

[0183] In some embodiments, the noise reduction device of the ventilation therapy device can include a first chamber 270, a second chamber 280, and a third chamber 330.

[0184] The first chamber 270 refers to a chamber in the noise reduction device for initially receiving and temporarily storing external fluid (such as air) and is used to provide the fluid with a preliminary buffer and flow guide space. In some embodiments, the first chamber 270 is provided with a gas inlet (for example, a first gas inlet 250, a second gas inlet 121, and an air inlet 21) for receiving the gas.

[0185] The second chamber 280 refers to an intermediate transition chamber in the noise reduction device connecting the first chamber 270 and the third chamber 330 and is used to realize the secondary buffering, temporary storage, and diversion of the gas flow. In some embodiments, the second chamber 280 is configured to accommodate the fan.

[0186] The third chamber 330 refers to the final processing chamber in the noise reduction device before the gas flow enters the fan and is used to realize the precise guidance, final noise reduction, and stable delivery of the gas flow. In some embodiments, the fan air inlet is exposed to the third chamber 330.

[0187] In some embodiments, the three chambers are arranged along the axial direction of the fan, the first chamber 270 is in fluid communication with the second chamber 280, and the second chamber 280 is in fluid communication with the third chamber 330.

[0188] In some embodiments, the gas entering through the air inlet can flow in the first chamber 270, the second chamber 280, and the third chamber 330 in sequence, and finally flow to the fan air inlet.

[0189] In some embodiments, the noise reduction device can further include an upper shell 1, a middle shell 2, a lower shell 3, a first partition plate 210, and a second partition plate 72, which are configured to form the first chamber 270, the second chamber 280, and the third chamber 330.

[0190] The upper shell 1 refers to the top shell assembly of the noise reduction device, the middle shell 2 refers to the middle shell assembly of the noise reduction device, and the lower shell 3 refers to the bottom shell assembly of the noise reduction device.

[0191] In some embodiments, the second partition plate 72 is provided with a ventilation opening 65, so that the fan air inlet 533 is exposed to the third chamber 330 through the ventilation opening 65.

[0192] After the first fan cover 510 and the fan 530 are installed on the second partition plate 72, the fan cover air inlet 512 and the corresponding fan air inlet 533 are exposed to the third chamber 330; while the fan cover air outlet 513 and the fan cover air inlet 512 are separated from each other, and the fan air inlet 533 and the fan air outlet 534 are also separated from each other. In other words, the second partition plate 72 can support the noise reduction structure of the fan, and separate the fan cover air inlet 512 and the fan cover air outlet 513 from each other, and separate the fan air inlet 533 corresponding to the fan cover air inlet 512 and the fan air outlet 534 corresponding to the fan cover air outlet 513 from each other. Thus, the air inlet side (low pressure side) and the air outlet side (high pressure side) of the fan 530 are separated from each other without affecting each other.

[0193] In some embodiments, the outer sleeve structure 5 (or referred to as the noise reduction structure) of the fan is connected to the second partition plate 72 through the suspension structure 560 described above. The fan 530 is located in the second chamber 280 and is connected to the second partition plate 72 through the suspension structure 560 on the noise reduction structure 5 of the fan. The second partition plate 72 can support the noise reduction device and expose the fan air inlet 533 installed in the first fan sleeve 510 to the third chamber 330 through the ventilation opening 65. The fan sleeve air inlet 512 and the fan air inlet 533 are both directed towards the third chamber 330 so as to be in fluid communication with the third chamber 330, so that the airflow in the third chamber 330 enters the fan 530 through the fan air inlet 533, and the fan 530 outputs the airflow by pressurizing the suctioned airflow through the fan air outlet 534. The third chamber 330 is in fluid communication with the fan sleeve air inlet 512 and the fan air inlet 533 through the ventilation opening 65 on the second partition plate 72. When the outer sleeve structure is connected to the second partition plate 72 through the suspension structure 560 described above, the fan sleeve air inlet 512 is coaxial with the ventilation opening 65. The gas enters the first chamber 270 through the air inlet, flows in the first chamber 270 to the second chamber 280, and then flows from the second chamber 280 to the third chamber 330, and then enters the fan sleeve air inlet 512 through the ventilation opening 65 from the third chamber 330, and then enters the fan air inlet 533. The gas of the fan air outlet 534 is discharged through the air outlet.

[0194] In some embodiments, the first partition plate 210 can be made of a flexible material, for example, made of silica gel material, etc. By setting the first partition plate 210 to be flexible, the first partition plate 210 can effectively absorb the airflow vibration in the chamber formed by the first partition plate 210, thereby achieving good buffering and noise reduction purposes.

[0195] In some embodiments, the second partition plate 72 is provided with a ventilation opening 65 corresponding to the position of the fan sleeve air inlet 512, so that the fluid entering the noise reduction device from the air inlet can flow through the first chamber 270, the second chamber 280 and the third chamber 330 in sequence, and then flow to the fan air inlet 533 installed in the first fan sleeve 510 through the ventilation opening 65.

[0196] In use, the noise reduction device is installed in the ventilation therapy equipment, the chambers of the noise reduction device are arranged perpendicular to the direction of the bottom plate of the ventilation therapy equipment, the first chamber 270 is the air inlet chamber, the second chamber 280 is the chamber where the fan 530 is located, the fan air inlet 533 can be arranged between the second chamber 280 and the third chamber 330 (i.e. aligned with the second partition 72 in the vertical height), or extended into the third chamber 330, to ensure that the fan air inlet 533 is only in fluid communication with the third chamber 330. The flow direction of the airflow between each chamber is perpendicular to the bottom plate of the ventilation therapy equipment, and the motor shaft of the fan 530 is also perpendicular to the bottom plate of the ventilation therapy equipment. Since the three chambers are arranged vertically relative to the horizontal plane of the bottom plate of the ventilation therapy equipment, and the axial direction of the fan 530 is also perpendicular to the horizontal plane of the bottom plate of the ventilation therapy equipment, the flow direction of the airflow between the chambers is also perpendicular to the horizontal plane of the bottom plate of the ventilation therapy equipment.

[0197] In some embodiments, the noise reduction device further comprises a first fan cover 510 configured to cover the volute portion 531 of the fan, the fan comprising a fan air inlet 533, one end of the first fan cover 510 having a fan cover air inlet 512 corresponding to the fan air inlet 533, the fan cover air inlet 512 being coaxial with the fan air inlet 533; wherein the surface of the first fan cover 510 near the side of the fan cover air inlet 512 is provided with a hanging structure 560 extending outward along the axial direction of the first fan cover 510 from the surface of the first fan cover 510, the hanging structure 560 comprising a limiting portion configured to limit the movement of the first fan cover 510 within a predetermined range when the first fan cover 510 is fixedly installed. For more information about the first fan cover 510, please refer to the foregoing relevant description.

[0198] In some embodiments, the second partition 72 comprises a hanging matching surface 61. The hanging matching surface 61 is used to cooperate with the supporting structure 570 of the first fan cover 510. For example, the hanging matching surface 61 is a surface on the upper surface of the second partition 72 that abuts against the surface of the supporting structure 570 or the first fan cover 510. Specifically, the supporting structure 570 of the first fan cover 510 or the surface of the lower half of the first fan cover 510 is in close contact with the hanging matching surface 61.

[0199] In some embodiments, the second partition plate 72 is provided with a hanging groove 311 corresponding to the hanging structure 560, the hanging structure 560 passes through the hanging groove 311, so that the limiting portion 562 is located below the hanging groove 311. Illustratively, the lug 561 is inserted into the hanging groove 311 from top to bottom, since there is a gap between the limiting portion 562 and the lug 561, the gap can facilitate the limiting portion 562 to deform and move towards the surface of the lug 561, so that the limiting portion 562 passes through the hanging groove 311 together with the lug 561, thereby making the limiting portion 562 located below the hanging groove 311. The end face of the limiting portion 562 close to the air inlet 512 of the first fan cover 510 is a matching end face 565, so when the limiting portion 562 passes through the hanging groove 311, it is located below the hanging groove 311, and the first fan cover 510 can be fixed from below the hanging groove 311, thereby blocking or preventing the lug 561 from being pulled out of the gap on the hanging groove 311 upwards, thereby avoiding the situation that the fan 530 is pulled out upwards.

[0200] In some embodiments, the hanging groove 311 is provided as a flared groove, the width of the flared groove towards one end of the first fan cover 510 is greater than the width away from the one end of the first fan cover 510. That is, the width of the upper end of the hanging groove 311 is larger, and the width of the lower end is smaller, so that when the limiting portion 562 passes through the hanging groove 311 together with the lug 561, the limiting portion 562 can prevent the lug 561 from being pulled out of the hanging groove 311.

[0201] In some embodiments, as shown in FIGS. 48-52, the second partition plate 72 includes a flange plate 31 and a sealing structure 6 matched with the flange plate 31, the edge of the sealing structure 6 can extend between the upper shell 1 and the middle shell 2, or between the middle shell 2 and the lower shell 3, thereby sealing the upper shell 1 and the middle shell 2, or the middle shell 2 and the lower shell 3 from each other. The flange plate 31 and the sealing structure 6 can be an integral structure or a split structure, in the case of a split structure, the flange plate 31 and the sealing structure 6 can be connected by fitting.

[0202] In some embodiments, the flange 31 and the sealing structure 6 are connected through the interlocking concave-convex structure. For example, as shown in FIG. 51a and FIG. 52, the edges of the upper surface of the flange 31 are provided with interlocking trapezoidal grooves 312 and trapezoidal bosses 314, and correspondingly, as shown in FIG. 51b, the edges of the lower surface of the sealing structure 6 are also provided with interlocking trapezoidal grooves 312 and trapezoidal bosses 314. When the sealing structure 6 is placed on the flange 31, the trapezoidal grooves 312 on the sealing structure 6 are matched with the trapezoidal bosses 314 on the flange 31, and the trapezoidal bosses 314 on the sealing structure 6 are matched with the trapezoidal grooves 312 on the flange 31, so as to fix the flange 31 and the sealing structure 6. It can be understood that the trapezoidal grooves 312 and the trapezoidal bosses 314 can also be other structures, such as dovetail grooves and dovetail bosses, as long as they can form a mortise and tenon connection between the flange 31 and the sealing structure 6.

[0203] In some embodiments, as shown in FIG. 39b, FIG. 51a and FIG. 51b, the ventilation opening 65 includes a first central hole 316 on the flange 31 and a second central hole 63 on the sealing structure 6, the first central hole 316 and the second central hole 63 have the same diameter and are coaxial, and the axis thereof is coaxial with the fan cover air inlet 512 of the first fan cover 510. A plurality of mounting grooves 315 are arranged on the flange 31 along the circumference of the first central hole 316, and as shown in FIG. 51b, a plurality of clamping bosses 62 are arranged on the sealing structure 6 along the circumference of the second central hole 63, the clamping bosses 62 correspond to the mounting grooves 315 one by one, and the clamping bosses 62 and the mounting grooves 315 are clamped with each other from below, so as to ensure the stable connection between the flange 31 and the sealing structure 6.

[0204] In some embodiments, the clamping boss 62 is located on the lower side surface of the sealing structure 6, that is, the side of the sealing structure 6 away from the first fan cover 510. In some embodiments, as shown in FIG. 48, the hanging matching surface 61 is located at the corresponding position of the clamping boss 62 on the upper side of the sealing structure 6. The hanging matching surface 61 is used to match with the support structure 570 of the first fan cover 510. In other embodiments, especially when the flange 31 and the sealing structure 6 are integrated, the hanging matching surface 61 is a surface of the upper surface of the second partition plate 72 which abuts against the surface of the support structure 570 or the first fan cover 510. Specifically, the support structure 570 of the first fan cover 510 or the surface of the lower half of the first fan cover 510 abuts against the hanging matching surface 61.

[0205] In some embodiments, the second partition 72 is provided with a hanging groove 311 corresponding to the hanging structure 560, the hanging structure 560 passes through the hanging groove 311, so that the limiting portion 562 is located below the hanging groove 311. As shown in FIGS. 45 and 46, the lug 561 is inserted into the hanging groove 311 from top to bottom, and since there is a gap between the limiting portion 562 and the lug 561, the gap can facilitate the deformation of the limiting portion 562 to move in the direction close to the surface of the lug 561, so that the limiting portion 562 passes through the hanging groove 311 together with the lug 561, thereby making the limiting portion 562 located below the hanging groove 311. As shown in FIG. 34, the end surface of the limiting portion 562 close to the air inlet 512 of the first fan cover 510 is a matching end surface 565, so that when the limiting portion 562 passes through the hanging groove 311, it is located below the hanging groove 311, and the first fan cover 510 can be fixed from below the hanging groove 311, thereby blocking or preventing the lug 561 from being pulled out upward from the gap on the hanging groove 311, thereby avoiding the upward pulling out of the fan 530.

[0206] In some embodiments, as shown in FIGS. 40 and 45, the hanging groove 311 is provided as a flared groove, the width of the flared groove towards one end of the first fan cover 510 is greater than the width away from the one end of the first fan cover 510. That is, the width of the upper end of the hanging groove 311 is greater, and the width of the lower end is smaller, so that when the limiting portion 562 passes through the hanging groove 311 together with the lug 561, the limiting portion 562 can prevent the lug 561 from being pulled out of the hanging groove 311.

[0207] In some embodiments, the noise reduction device can further include a second fan cover 520 configured to cover the motor portion of the fan, the second fan cover 520 is provided with a cavity 522 passing through the second fan cover 520 along the axial direction of the second fan cover 520, the cavity 522 is configured to accommodate the motor portion; the inner wall of the cavity 522 and the outer wall of the motor portion form a cooling inlet passage 540 for gas flow; the second fan cover 520 is further provided with a gas outlet portion, the cooling inlet passage 540 and the gas outlet portion are in fluid communication, and the gas in the cooling inlet passage 540 can flow to the outside of the second fan cover 520 through the gas outlet portion. For more information about the second fan cover 520, please refer to the foregoing relevant description, which will not be repeated here.

[0208] In some embodiments, as shown in FIGS. 1-4, the first partition 210 forms a first chamber 270 with the upper housing 1. In some embodiments, the first chamber 270 is provided with a first gas inlet 250 for receiving a first gas and a second gas inlet 121 for receiving a second gas. The first gas and the second gas can be determined based on experience or requirements. For example, the first gas can be air or the like, and the second gas can be oxygen or the like. It can be understood that the first chamber 270 is in fluid communication with the second chamber 280, and the first gas and the second gas can enter the first chamber 270 through the first gas inlet 250 and the second gas inlet 121 respectively, and then enter the second chamber 280 after premixing in the first chamber 270. The first chamber 270 can premix the first gas and the second gas before entering the fan, thereby improving the uniformity of the gas concentration at the fan outlet.

[0209] In some embodiments, the first partition 210, the second partition 72, and the middle housing 2 form the second chamber 280.

[0210] In some embodiments, the second partition 72 forms a third chamber 330 with the lower housing 3.

[0211] In some embodiments, as shown in FIGS. 2-4 and 8, the upper housing 1 includes a first gas chamber 110, a second gas chamber 120, and a mixing baffle 130.

[0212] In some embodiments, the first gas chamber 110 is configured to receive a first gas. For example, the first gas chamber 110 can be in fluid communication with a first gas inlet device to receive the first gas.

[0213] In some embodiments, the second gas chamber 120 is configured to receive a second gas. For example, the second gas chamber 120 can be in fluid communication with a second gas inlet device to receive the second gas. In some embodiments, the first gas chamber 110 is in fluid communication with the second gas chamber 120.

[0214] In some embodiments, as shown in FIG. 2, the mixing baffle 130 includes a plurality of baffle pieces 131 extending along the depth direction (e.g., the Z-axis direction shown in FIG. 2) of the first gas chamber 110 or the second gas chamber 120, and a mixing chamber 132 surrounded by the plurality of baffle pieces 131.

[0215] The mixing baffle 130 includes a plurality of baffle pieces 131 extending along the depth direction (e.g., the Z-axis direction shown in FIG. 2) of the first gas chamber 110 or the second gas chamber 120, and a mixing chamber 132 surrounded by the plurality of baffle pieces 131. The axial direction (i.e., the depth direction) of the mixing chamber 132 is the same as the depth direction (i.e., the Z-axis direction shown in FIG. 2) of the first gas chamber 110 and the second gas chamber 120.

[0216] In some embodiments, the barrier fins 131 are spaced apart to form barrier openings 133 between adjacent barrier fins 131, through which the first gas chamber 110 or the second gas chamber 120 can be in fluid communication with the mixing chamber 132.

[0217] For example, the first gas chamber 110 receives air, the second gas chamber 120 receives oxygen, and the first gas chamber 110 or the second gas chamber 120 can be in fluid communication with the mixing chamber 132 through the barrier openings 133. Since the first gas chamber 110 and the second gas chamber 120 are in fluid communication, the air in the first gas chamber 110 can flow into the second gas chamber 120 and, together with the oxygen in the second gas chamber 120, flow into the mixing chamber 132 through the barrier openings 133, thereby prolonging the flow path of the air into the mixing chamber 132 and allowing the air and the oxygen to mix for a longer time, so as to improve the uniformity of the mixture.

[0218] In some embodiments, as shown in FIG. 2, the upper shell 1 includes a shell side wall 10, and the interior chamber enclosed by the shell side wall 10 is the aforementioned first gas chamber 110, the second gas chamber 120, and the mixing chamber 132. The first gas chamber 110 has a first air inlet 250 (corresponding to the first end 410 of the first air inlet pipe 4 described below, please refer to FIG. 6) above it, so that the first gas chamber 110 receives the first gas flowing in the depth direction (Z-axis direction shown in FIG. 2) of the first gas chamber 110, i.e. the air inlet direction of the first gas chamber 110 is in the depth direction (as shown by the arrow in FIG. 2). The second gas chamber 120 is provided with a second air inlet 121 on the side wall, which extends in a direction perpendicular to the depth direction (X-axis direction shown in FIG. 2) of the first gas chamber 110, i.e. the air inlet direction of the second gas chamber 120 is in the length direction (as shown by the arrow in FIG. 2), and the air inlet directions of the first gas chamber 110 and the second gas chamber 120 are perpendicular to each other. It can be understood that the second gas enters the upper shell 1 at a high speed, and when it hits the barrier fins 131 or other inner walls in the upper shell 1, it will produce noise, which is not conducive to noise reduction. In order to suppress the noise caused by the impact of high-speed airflow, the size of the upper shell 1 in the depth direction (Z-axis direction shown in FIG. 2) can be set smaller, and the size of the upper shell 1 in the horizontal direction (X-axis direction shown in FIG. 2) can be set larger, so that the second air inlet 121 is arranged to extend in the X-axis direction shown in FIG. 2, which is conducive to buffering the high-pressure and high-speed oxygen flow entering from the second air inlet 121.

[0219] In some embodiments, as shown in FIG. 2, the density of the barrier fins 131 gradually increases in the direction close to the first gas inlet 250 of the first gas chamber 110 or the second gas inlet 121 of the second gas chamber 120, i.e. the barrier fins 131 are distributed more densely at the position close to the gas inlet, and the width (the size in the circumferential direction of the mixing chamber 132) of the barrier openings 133 formed between adjacent barrier fins 131 is smaller; on the contrary, the barrier fins 131 are distributed more sparsely at the position far away from the gas inlet, and the width (i.e. the size in the circumferential direction of the mixing chamber 132) of the barrier openings 133 formed between adjacent barrier fins 131 is larger. With this design, the two gases can flow more easily to the position far away from the first gas inlet 250 or close to the second gas inlet 121, promoting uniform mixing and making the uniformly mixed gas flow through the motor portion at a uniform flow rate to achieve effective heat dissipation.

[0220] In some embodiments, the depth (i.e. the size in the axial direction of the mixing chamber 132) of at least one of the plurality of barrier openings 133 is smaller than that of the other barrier openings 133. As shown in FIG. 2, in the gas inlet direction of the second gas chamber 120, the barrier opening 133 farthest from the second gas inlet 121 is the first barrier opening 1331, which has the shallowest depth; the other barrier openings 133 are the second barrier openings 1332, which can have the same or different depths (deeper than the depth of the first barrier opening 1331). It can be understood that the second gas enters the upper shell 1 at a faster speed, and in order to avoid as much as possible the noise caused by the collision between the second gas and the barrier fins 131, the second barrier openings 1332 close to the second gas inlet 121 are set deeper to reduce the collision area between the second gas and the barrier fins 131; and the depth of the first barrier opening 1331 is set shallower, so that the first gas and the second gas can stay relatively longer at this position, thereby promoting uniform mixing.

[0221] In addition, the second barrier openings 1332 can have the same or different widths (i.e. the size in the circumferential direction of the mixing chamber 132). For example, the width of the second barrier openings 1332 can be gradually reduced in the direction close to the gas inlet, so that the barrier fins 131 are distributed more densely.

[0222] In some embodiments, a portion of the plurality of baffle pieces 131 form the sidewall of the first gas chamber 110, a portion of the plurality of baffle pieces 131 form the sidewall of the second gas chamber 120, and the baffle piece 131 forming the sidewall of the first gas chamber 110 has the largest width. As shown in FIG. 2, one of the plurality of baffle pieces 131 is a first baffle piece 1311 forming the sidewall of the first gas chamber 110, and the other baffle pieces 131 are second baffle pieces 1312 forming the sidewall of the second gas chamber 120. The width (i.e., the dimension in the circumferential direction of the mixing chamber 132) of the first baffle piece 1311 is greater than the width of each of the second baffle pieces 1312. The first baffle piece 1311 forming the sidewall of the first gas chamber 110 can block the flow of the first gas in the first gas chamber 110 to some extent, so that the first gas can only flow around the first baffle piece 1311 to enter the second gas chamber 120, thereby promoting uniform mixing between the first gas and the second gas.

[0223] In some embodiments, the baffle openings 133 on both sides of the first baffle piece 1311 are second baffle openings 1332, and the second baffle openings 1332 and the first baffle openings 1331 are both located outside the first gas chamber 110, i.e., each baffle opening 133 is located between the baffle pieces 131 forming the sidewall of the second gas chamber 120. In this case, the first gas chamber 110 does not directly communicate with the baffle openings 133, but communicates with the baffle openings 133 through the second gas chamber 120. Therefore, the first gas in the first gas chamber 110 needs to pass through the first gas chamber 110 and enter the second gas chamber 120 before it can enter the mixing chamber 132 together with the second gas in the second gas chamber 120 through the baffle openings 133, thereby extending the flow path of the first gas in the first gas chamber 110 as much as possible, so that the first gas and the second gas are mixed more uniformly.

[0224] In some embodiments, as shown in FIGS. 2 and 3, a first baffle plate 141 and a second baffle plate 142 are provided between the first gas chamber 110 and the second gas chamber 120, wherein the first baffle plate 141 and the second baffle plate 142 form the sidewall of the first gas chamber 110, and the first baffle plate 141 and the second baffle plate 142 form the sidewall of the second gas chamber 120. That is, the sidewall of the first gas chamber 110 is the housing sidewall 10, the first baffle plate 141, the first baffle piece 1311, and the second baffle plate 142. In some embodiments, the height h1 (the dimension in the Z-axis direction shown in FIG. 2) of the second baffle plate 142 is less than the height h2 of the housing sidewall 10, and the height h2 of the housing sidewall 10 is less than the height h3 of the first baffle piece 1311.

[0225] In some embodiments, the first baffle 141 can be configured to have the same height h3 as the first louvers 1311. It can be appreciated that the first baffle 141 can block the flow of the first gas in the first gas chamber 110, so that the first gas can only flow around the first baffle 141 and the first louvers 1311 to enter the second gas chamber 120, thereby facilitating the uniform mixing of the first gas and the second gas.

[0226] In some embodiments, the first baffle 141 can also be configured to have a recessed structure, so that a portion of the first baffle 141 has the same height as the first louvers 1311, and another portion of the first baffle 141 has the same height as the housing side wall 10. The portion having the same height as the first louvers 1311 can block the flow of the first gas in the first gas chamber 110, and the portion having the same height as the housing side wall 10 can form an interlocking contact structure with the middle housing 2 to be described later, thereby facilitating positioning and installation.

[0227] In some embodiments, the side walls of the second gas chamber 120 are the housing side wall 10, the first baffle 141, the second louvers 1312, and the second baffle 142.

[0228] Since the height h1 of the second baffle 142 is less than the height h2 of the housing side wall 10, the first gas chamber 110 can be in fluid communication with the second gas chamber 120 at the second baffle 142, i.e. the first gas in the first gas chamber 110 can pass over the second baffle 142 to enter the second gas chamber 120 to mix with the second gas in the second gas chamber 120. As shown in FIG. 2, the second gas chamber 120 is configured to receive the second gas, and thus has a larger volume than the first gas chamber 110 configured to receive the first gas, so that more second gas can be mixed with the first gas.

[0229] In some embodiments, the first gas chamber 110 can accommodate a portion of the first gas inlet device (the first gas inlet pipe 4 to be described later), i.e. a portion of the first gas inlet device can be vertically inserted into the first gas chamber 110, so that the first gas chamber 110 receives the first gas flowing in the depth direction thereof.

[0230] In some embodiments, the side wall of the second gas chamber 120 (i.e. the housing side wall 10) is provided with a second gas inlet 121 for fluid communication with the second gas inlet device, and the second gas can enter the second gas chamber 120 from the second gas inlet 121 in a direction perpendicular to the inlet direction of the first gas. Therefore, the inlet directions of the second gas and the first gas are different, i.e. the turning of the different gas flows can be increased, thereby achieving a good noise reduction effect.

[0231] In some embodiments, as shown in FIG. 2 and FIG. 3, the outer side of the mixing baffle 130 is provided with a plurality of reinforcing / guiding structures 143 which are spaced along the circumference of the mixing baffle 130, and the reinforcing / guiding structures 143 have inclined surfaces 144 which are inclined towards the first gas chamber 110 or the second gas chamber 120. The reinforcing / guiding structures 143 can fix the plurality of baffle pieces 131 in the upper shell 1 on the one hand, and on the other hand, the reinforcing / guiding structures 143 have the inclined surfaces 144 which can guide the gas in the first gas chamber 110 and the second gas chamber 120 to the mixing chamber 132.

[0232] In some embodiments, as shown in FIG. 7a-FIG. 8, the first partition plate 210 is provided with a mounting hole 220, and the second fan sleeve 520 which covers the motor portion 532 of the fan 530 is arranged in the mounting hole 220.

[0233] In some embodiments, as shown in FIG. 7a-FIG. 8, the first partition plate 210 is provided with a mounting hole 220 which penetrates the first partition plate 210, and the second fan sleeve 520 is arranged in the mounting hole 220, and a part of the mounting hole 220 extends into the mixing chamber 132.

[0234] It can be understood that a part of the mounting hole 220 extends into the mixing chamber 132, so that each baffle piece 131 surrounds the part of the mounting hole 220 which is located outside the mixing chamber 132, thereby playing the role of a screen to block the transmission of noise to the outside of the upper shell 1 to achieve the effect of noise reduction.

[0235] In some embodiments, there is a gap between the mixing chamber 132 and the outer wall of the mounting hole 220. As shown in FIG. 9, the gap can be a radial gap d1, i.e. the difference between the inner diameter radius of the mixing chamber 132 and the outer diameter radius of the mounting hole 220. The mixed gas which enters the mixing chamber 132 can pass through the radial gap between the inner wall of the mixing chamber 132 and the outer wall of the mounting hole 220, enter the cooling flow channel 540 from the upper end of the second fan sleeve 520, flow along the axial direction of the second fan sleeve 520 downward as shown by the arrow in FIG. 8, and flow from the second groove 521 at the bottom end of the second fan sleeve 520 to the outside of the second fan sleeve 520, i.e. to the second chamber 280 in which the second fan sleeve 520 is located, and finally to the fan inlet 533. It can be understood that the first gas and the second gas have been mixed once in the mixing chamber 132 before entering the fan inlet 533, and this mixing process can also be referred to as "pre-mixing"; after entering the fan inlet 533, the first gas and the second gas are mixed again in the fan 530, and are outputted from the fan outlet 534, so as to provide the patient with ventilation gas which is mixed more uniformly and has more accurate concentration control.

[0236] In some embodiments, as shown in FIGS. 7a, 7b and 10, the first partition plate 210 is further provided with annular baffles 230, which are located in the second chamber 280 and are arranged outside the mounting hole 220 along the axial direction of the mounting hole 220, with the end of the annular baffles 230 extending beyond the mounting hole 220.

[0237] In some embodiments, the number of annular baffles 230 can be multiple, and the multiple annular baffles 230 can have different heights to guide and arrange the airflow.

[0238] In some embodiments, the noise reduction device further comprises a first air inlet pipe 4 configured to receive the first gas. The first air inlet pipe 4 can have various shapes. For example, the first air inlet pipe 4 can have a bent pipe structure. The first air inlet pipe 4 can have various materials. For example, the first air inlet pipe 4 can be flexible. It can be understood that the air inlet is configured as a bent pipe structure, which can change the direction of the airflow to increase the cost of noise transmission outside the noise reduction device, so that part of the noise sound waves are converted into heat to achieve the purpose of noise reduction. On the other hand, the bent pipe structure of flexible material can absorb part of the noise sound waves and convert them into vibrations to achieve the effect of noise reduction.

[0239] In some embodiments, as shown in FIGS. 7a-8, the first partition plate 210 is provided with a first air inlet 250, and the first side wall of the middle shell 2 is provided with a third air inlet 260, and the axes of the first air inlet 250 and the third air inlet 260 are perpendicular to each other.

[0240] In some embodiments, as shown in FIGS. 5-7b, the first end 410 of the first air inlet pipe 4 passes through the first air inlet 250 and extends into the first gas chamber 110, and the second end 420 of the first air inlet pipe 4 passes through the third air inlet 260 and extends outside the first side wall of the middle shell 2 to be in fluid connection with the air inlet of the ventilation therapy device. It can be understood that, due to the decrease in air pressure in the noise reduction device when the fan 530 is working, external air can enter the first air inlet pipe 4 through the first air inlet 250 of the ventilation therapy device and then enter the noise reduction device.

[0241] In some embodiments, as shown in FIGS. 6 and 11, the first end 410 of the first air inlet pipe 4 is provided with a notch 411, and the position of the notch 411 is away from the aforementioned first partition plate 1311. This position setting can avoid the first gas flowing from the first end 410 of the first air inlet pipe 4 into the first gas chamber 110 directly flowing into the mixing chamber 132 through the first partition plate 1311, thereby ensuring that the aforementioned first gas can flow through the second baffle 142 into the second gas chamber 120 according to the predetermined flow direction, promoting the mixing of the gases.

[0242] In some embodiments, as shown in FIG. 4 and FIG. 9, the middle shell 2 is further provided with an air outlet 240, and the fan cover air outlet is arranged in the air outlet 240, and the air output from the fan air outlet 534 can be output to the outside through the pipeline connected to the air outlet 240. The air outlet 240 can be located on the second side wall of the middle shell 2, for example, wherein the second side wall is arranged opposite to the first side wall of the middle shell 2.

[0243] In some embodiments, the second partition plate 72 forms a second chamber 280 with the upper shell 1. In some embodiments, as shown in FIG. 36, FIG. 44a and FIG. 55, the upper shell 1 is located above the lower shell 3, and the upper shell 1 is provided with an air outlet 11 located on the top wall of the upper shell 1, and the air (fluid) entering the fan can flow out of the noise reduction device from the air outlet 11.

[0244] In some embodiments, an air outlet cavity is further formed between the upper shell 1 and the second partition plate 72, and the air outlet 11 is arranged in the region of the upper shell 1 corresponding to the air outlet cavity. The air outlet cavity is fluidly isolated from the second chamber 280, and when the fan 530 is installed in the noise reduction device through the fan noise reduction structure 5, the fan air outlet 534 extends into the air outlet cavity, so that the fan air inlet side and the fan air outlet side are fluidly isolated. As shown in FIG. 48, the flange plate 31 of the second partition plate 72 is further provided with an air outlet baffle 64, and the air outlet baffle 64 and the upper shell 1 form an air outlet cavity. As shown in FIG. 40, the third fan cover 550 extends to the region where the air outlet baffle 64 is located, so that the fan cover air outlet 513 is located in the air outlet cavity. Please refer to FIG. 53-FIG. 55, the air outlet baffle 64 extends along the axial direction of the first fan cover 510. The air outlet baffle 64 can be an arc-shaped baffle formed on the flange plate 31, for example, and the airflow in the fan 530 can flow from the fan cover air outlet 513 to pass through the air outlet baffle 64. The air outlet baffle 64 can arrange and guide the airflow, so that the airflow can flow to the outside of the noise reduction device through the air outlet 11.

[0245] Therefore, it can be known that after the first fan cover 510 and the fan 530 are installed on the second partition plate 72, the fan cover air inlet 512 and the corresponding fan air inlet 533 are exposed to the third chamber 330; and the fan cover air outlet 513 and the corresponding fan air outlet 534 are exposed to the air outlet cavity, that is, the fan cover air inlet 512 and the fan cover air outlet 513 are isolated from each other, and the fan air inlet 533 and the fan air outlet 534 are also isolated from each other. In other words, the second partition plate 72 can support the fan noise reduction structure 5, and the fan cover air inlet 512 and the fan cover air outlet 513 are isolated from each other, and the fan air inlet 533 corresponding to the fan cover air inlet 512 and the fan air outlet 534 corresponding to the fan cover air outlet 513 are isolated from each other. Thus, the air inlet side (low pressure side) and the air outlet side (high pressure side) of the fan 530 are isolated from each other and do not affect each other.

[0246] In some embodiments, the first baffle 210, the second baffle 72 and the middle shell 2 form a third chamber 330. In some embodiments, the noise reduction structure 5 of the fan is connected to the second baffle 72 by the aforementioned suspension structure 560. As shown in FIG. 37, the fan 530 is located in the second chamber 280 formed by the second baffle 72 and the upper shell 1, and is connected to the second baffle 72 by the suspension structure 560 on the noise reduction structure 5 of the fan. The second baffle 72 can support the noise reduction device, and the fan air inlet 533 installed in the first fan cover 510 is exposed to the third chamber 330 formed by the first baffle 210, the second baffle 72 and the middle shell 2 through the ventilation opening 65. As shown in FIG. 39b, the fan cover air inlet 512 and the fan air inlet 533 are both directed towards the third chamber 330 so as to be in fluid communication with the third chamber 330, so that the airflow in the third chamber 330 enters the fan 530 through the fan air inlet 533, and the fan 530 outputs the sucked airflow through the fan air outlet 534. As shown in FIG. 37, the third chamber 330 is in fluid communication with the fan cover air inlet 512 and the fan air inlet 533 through the ventilation opening 65 on the second baffle 72 (see FIG. 39b and FIG. 48). When the noise reduction device is connected to the second baffle 72 by the aforementioned suspension structure 560, the fan cover air inlet 512 is coaxial with the ventilation opening 65. The arrows in FIG. 37 show the airflow in the chambers. The air enters the first chamber 270 through the air inlet 21 on the lower shell 3, flows in the first chamber 270 to the second chamber 280, and then flows from the second chamber 280 to the third chamber 330, and then enters the fan cover air inlet 512 and the fan air inlet 533 from the third chamber 330 through the ventilation opening 65. The air from the fan air outlet 534 is discharged through the air outlet 11.

[0247] In some embodiments, as shown in FIG. 42a and FIG. 46, the first baffle 210 can be made of a flexible material, such as a silicone material, etc. As shown in FIG. 42a and FIG. 42b, and in combination with FIG. 39b, the first baffle 210 is arranged in the lower shell 3, so that the lower side of the first baffle 210 and the inner wall of the lower shell 3 define and seal the first chamber 270 to form a sealed chamber capable of flowing air. Similarly, the upper side of the first baffle 210 and the second baffle 72 define the third chamber 330 to form a sealed chamber capable of flowing air. Arranging the first baffle 210 to be made of a flexible material can effectively absorb the airflow vibration in the first chamber 270 and the third chamber 330 formed by the first baffle 210, thereby achieving good buffering and noise reduction purposes.

[0248] In some embodiments, the first partition 210 forms a first chamber 270 with the lower shell 3. In some embodiments, as shown in FIG. 36, FIG. 42b, FIG. 43 and FIG. 44a, the lower shell 3 is provided with an air inlet 21 on a sidewall of the lower shell 3 through which air enters the first chamber 270.

[0249] In some embodiments, the second partition 72 is provided with a ventilation opening 65 (as shown in FIG. 39b) at a position corresponding to the fan cover inlet 512 of the noise reduction device, so that the fluid entering the noise reduction device from the air inlet 21 can flow through the first chamber 270, the second chamber 280 and the third chamber 330 in sequence, and then flow to the fan inlet 533 of the fan installed in the first fan cover 510 through the ventilation opening 65.

[0250] In use, the noise reduction device is installed in the ventilation therapy device, and the chambers of the noise reduction device are arranged perpendicular to the direction of the bottom plate of the ventilation therapy device. The first chamber 270 is an air inlet chamber, the second chamber 280 is a chamber where the fan 530 is located, and the fan inlet 533 can be arranged between the second chamber 280 and the third chamber 330 (i.e. aligned with the second partition 72 in the vertical height), or extended into the third chamber 330, so as to ensure that the fan inlet 533 is only in fluid communication with the third chamber 330. The flow direction of the airflow between each chamber is perpendicular to the bottom plate of the ventilation therapy device, and the motor shaft of the fan 530 is also perpendicular to the bottom plate of the ventilation therapy device. In some embodiments, the first chamber 270 is the lowermost chamber of the entire noise reduction device, the second chamber 280 is the uppermost chamber of the entire noise reduction device, and the third chamber 330 is the middle chamber of the entire noise reduction device, i.e. between the first chamber 270 and the second chamber 280. Since the three chambers are arranged vertically relative to the horizontal plane of the bottom plate of the ventilation therapy device, and the axial direction of the fan 530 is also perpendicular to the horizontal plane of the bottom plate of the ventilation therapy device, the flow direction of the airflow between the chambers is also perpendicular to the horizontal plane of the bottom plate of the ventilation therapy device.

[0251] In some embodiments, as shown in FIG. 42a, FIG. 43 and FIG. 44a, the lower portion of the first partition 210 and the first chamber 270 further enclose a flow inlet channel 234 for guiding the air flow entering the first chamber 270 from the air inlet 21. Since the air inlet 21 is located on the sidewall of the lower shell 3, the air inlet 21 can be in fluid communication with the first chamber 270 through the flow inlet channel 234 to extend the air flow path. As shown in FIG. 44a, one end of the flow inlet channel 234 is aligned with and in fluid communication with the air inlet 21. Since the first partition 210 is located above the first chamber 270, the flow inlet channel 234 is configured in a bent pipe structure. By changing the size of the cross section of the flow inlet channel 234 once, the air flow entering the flow inlet channel 234 from the air inlet 21 (flowing in a direction perpendicular to the sidewall of the lower shell 3) can be changed to a vertically downward direction in the first chamber 270. As shown in FIG. 53-FIG. 55, the air outlet 11 in the upper shell 1 is correspondingly arranged with the air outlet baffle 64 on the flange plate 31. As shown in FIG. 55, an air outlet hole 237 is arranged on one sidewall of the upper shell 1. The fan cover air outlet 513 passes through the air outlet hole 237 and extends into the air outlet cavity. The air outlet hole 237 can fix the third fan cover 550. The air flow from the fan air outlet 534 can enter the air outlet cavity and flow out from the air outlet 11.

[0252] In some embodiments, as shown in FIG. 42b and FIG. 47, the first chamber 270 includes a first flow channel 221 for guiding and directing the air flow. In some embodiments, the first flow channel 221 extends inside the lower shell 3 and both ends of the first flow channel 221 are directed towards the sidewall of the lower shell 3 where the air inlet 21 is located. The air inlet end of the first flow channel 221 is in fluid communication with the air inlet 21 of the lower shell 3, and the air outlet end of the first flow channel 221 is in fluid communication with the first flow guide device. It can be understood that after the air enters the first flow channel 221 from the air inlet 21, it needs to flow a longer path inside the lower shell 3 to meet the requirement of reducing noise. Therefore, the first flow channel 221 is configured to make the air flow path in the lower shell 3 as long as possible.

[0253] In some embodiments, the number of first flow channels 221 can be multiple. The air inlet ends of the multiple first flow channels 221 are arranged side by side, and the air outlet ends of the multiple first flow channels 221 are diverged radially outward along the volute portion 531 of the fan. For example, multiple partitions can be arranged in the first chamber 270 to construct the first flow channel 221. The partitions can be one or more of straight partitions, inclined partitions and arc-shaped partitions. The shapes of the corresponding first flow channels 221 can be various shapes. FIG. 42b and FIG. 47 respectively show two different structural forms of the first flow channel 221.

[0254] In some embodiments, as shown in FIG. 42b, the number of first flow channels 221 is 3, and the air inlet ends of the first flow channels 221 are arranged side by side so as to be in communication with the air inlet 21, and the air outlet ends of the first flow channels 221 are radially divergent. Since the flow guide body is provided with a flow guide inclined surface 713 (see the relevant content described later) corresponding to the fluid inflow end and is located above the air outlet end of the first flow channel 221, the air outlet end of the first flow channel 221 is arranged in a radial divergent structure, so that the airflow flowing out of the air outlet end of the first flow channel 221 is also divergent, which is more conducive to the uniform entry of airflow into each first flow guide pipe 711.

[0255] In some embodiments, as shown in FIG. 47, a flow monitoring device 8, such as a flow sensor, can be arranged in the first flow channel 221 to monitor the airflow in the first flow channel 221.

[0256] In some embodiments, a flow guide cone 310 is arranged at a position opposite to the fan air inlet in the third chamber 330, and the flow guide cone 310 is configured to guide the airflow in the third chamber 330 to the fan air inlet; along the axial direction of the fan, the flow guide cone 310 is arranged below the air inlet and extends towards the air inlet, the flow guide cone 310 is coaxial with the air inlet, and the flow guide cone 310 is a tapered structure with a diameter that decreases towards the air inlet.

[0257] In some embodiments, as shown in FIG. 15, the flow guide cone 310 is arranged below the fan air inlet 533 and extends towards the fan air inlet 533, and the flow guide cone 310 is coaxial with the fan air inlet 533. In some embodiments, the flow guide cone 310 is a tapered structure with a diameter that decreases towards the fan air inlet 533, and the airflow in the third chamber 330 can be guided by the flow guide cone 310 to enter the fan air inlet 533. The mixed gas entering the mixing chamber 132 flows along the cooling flow channel 540 and enters the second chamber 280, the gas in the second chamber 280 can flow along the flow guide body 73 and enter the third chamber 330, and the gas in the third chamber 330 enters the fan air inlet 533 under the guidance of the flow guide cone 310. Therefore, the flow direction of the gas between the chambers is along the axial direction of the fan 530 (i.e., perpendicular to the direction of the bottom plate of the ventilation therapy device).

[0258] In some embodiments, as shown in FIGS. 37-39b and 42a, the lower surface of the third chamber 330 (e.g., the lower surface of the first partition 210 or the lower surface of the lower shell 3) is provided with a flow guide cone 310, which is located below and extends towards the air inlet 512 of the fan cover, and is coaxial with the air inlet 512 of the fan cover. The flow guide cone 310 is a tapered structure that narrows towards the air inlet 512 of the fan cover. The airflow in the third chamber 330 can be guided by the flow guide cone 310 into the air inlet 533 of the fan.

[0259] In some embodiments, as shown in FIG. 49, the lower side of the second partition 72 is also provided with a plurality of flow guide fins 313, which extend into the third chamber 330 to arrange and guide the airflow in the third chamber 330 to enter the air inlet 533 of the fan cover along the flow guide cone 310. The flow guide fins 313 can be various structural forms such as arc-shaped fins, bent fins, straight plates, inclined plates, etc., which are not limited in the present application.

[0260] In some embodiments, at least one resonance cavity 320 is further provided in one or more of the upper shell 1, the middle shell 2, and the lower shell 3, which is configured to enable the airflow in the resonance cavity 320 to resonate with external sound waves of a specific frequency. The resonance cavity 320 can have various shapes. For example, the cross-sectional shape of the resonance cavity 320 can be rectangular, cylindrical, or other shapes, as long as its volume meets the above formula. The resonance cavity can have various positions.

[0261] In some embodiments, as shown in FIG. 15, the inside of the lower shell 3 is further provided with a resonance cavity 320, which can be located, for example, on one side of the third chamber 330. The resonance cavity 320 is configured to enable the airflow in the resonance cavity 320 to resonate with sound waves of a specific frequency, thereby reducing noise of the specific frequency. It can be understood that when a sound wave of a certain frequency passes through the resonance cavity 320, it will cause resonance of the airflow in the resonance cavity 320. The vibration can convert part of the energy of the noise sound wave into heat energy, thereby achieving the purpose of reducing noise of the whole machine.

[0262] In some embodiments, as shown in FIG. 42a, the resonance cavity 320 can be provided in the third chamber 330 and enclosed by the upper side of the first partition 210 and the second partition 72. The resonance cavity 320 can be a separate chamber separated in the third chamber 330.

[0263] In some embodiments, as shown in FIGS. 42a and 42c, the third chamber 330 can have two resonance cavities 320, each of which has a resonance cavity inlet 236 configured as a hole or a slot penetrating through the first partition 210. For example, as shown in FIG. 42a, each resonance cavity inlet 236 is configured as an elongated hole.

[0264] In some embodiments, as shown in FIG. 42c, since the resonance cavity inlet 236 penetrates the first partition plate 210, it can be known that the resonance cavity 320 can be in fluid communication with the first cavity 270 below the third cavity 330 through the resonance cavity inlet 236. That is, the air in the first cavity 270 can enter the resonance cavity 320 through the resonance cavity inlet 236, so as to cause resonance of the airflow in the resonance cavity 320, so as to achieve the purpose of noise reduction.

[0265] In some embodiments, the resonance cavity 320 can be arranged in the following manner. The noise reduction device is subjected to noise frequency test to obtain the frequency (for example, 1500 Hz) at which the maximum noise is located; the volume V of the resonance cavity 320 is calculated according to the following formulas (1) and (2). Wherein, V is the volume of the resonance cavity 320; c is the speed of sound, which can be calculated as 340 m / s; f is the frequency at which the maximum noise is located; S c is the diameter of the opening of the resonance cavity 320; and l c is the length of the opening of the resonance cavity 320.

[0266] In some embodiments, the noise reduction device further comprises a flow guide device, the flow guide device extends to two cavities in the first cavity 270, the second cavity 280 and the third cavity 330 along the axial direction of the fan, and the two cavities are in fluid communication through the flow guide device.

[0267] The flow guide device refers to the overall component that realizes the flow guide function. In some embodiments, the flow guide device comprises at least one flow guide body, the flow guide body extends along the axial direction of the fan; and / or the flow guide body is provided with a flow guide inclined surface 713 corresponding to the end where the fluid flows in.

[0268] In some embodiments, as shown in FIGS. 8-12, the noise reduction device further comprises a flow guide device 7, as shown in FIG. 11, the flow guide device 7 comprises a second partition plate 72 and a flow guide body 73 arranged on the second partition plate 72, wherein the second partition plate 72 covers the lower shell 3, and more specifically, the second partition plate 72 is located between the second cavity 280 of the middle shell 2 and the lower shell 3. Therefore, it can be known that the upper end surface of the second partition plate 72 can seal the second cavity 280, and the lower end surface thereof can seal the third cavity 330 inside the lower shell 3. In some embodiments, the flow guide body 73 comprises a flow guide pipe 71, or can be regarded as identical to the flow guide pipe 71.

[0269] In some embodiments, as shown in FIG. 10, FIG. 14 and FIG. 16, the second partition plate 72 is provided with an opening, and the flow guide body 73 penetrates the second partition plate 72 through the opening, one end of the flow guide body 73 extends into the second chamber 280 of the middle shell 2, and the other end extends into the lower shell 3. The flow guide body 73 can be a plurality of tubular structures arranged in the form of a sector, and each tubular structure can be in communication with each other or not.

[0270] In some embodiments, as shown in FIG. 10, the flow guide body 73 can communicate the second chamber 280 of the middle shell 2 and the third chamber 330 of the lower shell 3. The mixed gas entering the cooling inlet passage 540 flows downward along the axis of the second fan sleeve 520, and flows from the second groove 521 at the bottom end of the second fan sleeve 520 into the second chamber 280 of the middle shell 2. Under the guidance of the annular baffle 230, the mixed gas can enter the flow guide body 73 from above the flow guide body 73, and flow from below the flow guide body 73 into the third chamber 330 inside the lower shell 3.

[0271] It should be noted that the third chamber 330 of the lower shell 3 is only in fluid communication with the second chamber 280 in the middle shell 2 through the flow guide body 73, and not through the through hole of the fan sleeve air inlet 512 of the first fan sleeve 510 installed on the second partition plate 72. Therefore, the fan sleeve air inlet 512 of the first fan sleeve 510 is sealed at the edge of the corresponding through hole, so that the third chamber 330 and the second chamber 280 are not directly in fluid communication through the through hole. Since the fan air inlet 533 is exposed to the third chamber 330, the fan air inlet 533 can only absorb the airflow in the third chamber 330, and cannot directly absorb the airflow in the second chamber 280 where the fan 530 is located. Through such a setting mode, the flow transmission path of the airflow in the noise reduction device can be prolonged, so that a better sound reduction purpose can be achieved.

[0272] In some embodiments, as shown in FIG. 37-FIG. 39b, the middle shell 2 is provided with a first flow guide device penetrating the middle shell 2, and the two ends of the first flow guide device extend into the first chamber 270 and the second chamber 280 respectively, and the second chamber 280 is in fluid communication with the first chamber 270 through the first flow guide device.

[0273] In some embodiments, as shown in FIG. 37, FIG. 40 and FIG. 41, the first flow guide device includes at least one first flow guide pipe 711. The number of first flow guide pipes 711 can be set according to experience or demand. As shown in FIG. 40, a plurality of first flow guide pipes 711 are arranged side by side, each first flow guide pipe 711 extends along the axis of the first fan sleeve 510 and penetrates the flange plate 31 and the first partition plate 210, and the centers of the plurality of first flow guide pipes 711 are located on a virtual circle concentric with the contour line of the first fan sleeve 510, that is, the plurality of first flow guide pipes 711 are distributed in the form of a sector on one side of the first fan sleeve 510.

[0274] In some embodiments, as shown in FIG. 37, FIG. 38 and FIG. 52, the first flow guide 711 extends into and is in fluid communication with the first chamber 270 and the second chamber 280, respectively. Thus, air in the first chamber 270 can flow upwardly into the second chamber 280 via the first flow guide 711. It can be appreciated that the first flow guides 711 can be in fluid communication with each other or can be provided with communication slots on the sidewalls of the first flow guides 711 so as to be in fluid communication with each other.

[0275] In some embodiments, the second flow guide device is provided on the second partition 72 and extends into and is in fluid communication with the second chamber 280 and a third chamber 330, respectively, the third chamber 330 being in fluid communication with the second chamber 280 via the second flow guide device.

[0276] In some embodiments, as shown in FIG. 37, FIG. 40, FIG. 41 and FIG. 52, the second flow guide device comprises at least one second flow guide 712, the number of the second flow guides 712 being set according to experience or requirement. As shown in FIG. 40, the second flow guide 712 can be formed by a plurality of pipes in communication, each of the pipes extending in the axial direction of the first fan cover 510 and penetrating through the flange plate 31. Thus, the second flow guide 712 is also distributed in the form of a sector on the other side of the first fan cover 510 compared to the first flow guide device. It can be appreciated that the second flow guide device can also adopt the structural form of the plurality of first flow guides 711.

[0277] As shown in FIG. 37, the second flow guide 712 is different from the first flow guide 711 in that the second flow guide 712 extends in the axial direction of the first fan cover 510 and penetrates through the flange plate 31 but does not penetrate through the first partition 210 (as shown in FIG. 39b). That is, the second flow guide 712 extends into and is in fluid communication with the second chamber 280 and the third chamber 330, respectively. Thus, air in the second chamber 280 can flow downwardly into the third chamber 330 via the second flow guide 712.

[0278] In some embodiments, as shown in FIG. 37, FIG. 52 and FIG. 53, the end of the first flow guide pipe 711 in the first chamber 270 corresponding to the end where the fluid flows in is provided with a flow guide inclined surface 713 to facilitate the air in the first chamber 270 to smoothly enter the first flow guide pipe 711. It is envisaged that the end of the second flow guide pipe 712 in the second chamber 280 corresponding to the end where the fluid flows in is also provided with a flow guide inclined surface 713. It is noted that the second chamber 280 and the third chamber 330 are only in fluid communication through the second flow guide device, and not through the ventilation opening 65 provided on the second partition plate 72, so the fan sleeve air inlet 512 of the first fan sleeve 510 is sealed to the opening edge corresponding to the ventilation opening 65, so that the second chamber 280 and the third chamber 330 are not directly in fluid communication through the ventilation opening 65; the fan air inlet 533 is exposed to the third chamber 330, so the fan air inlet 533 can only absorb the airflow in the third chamber 330, and cannot directly absorb the airflow in the second chamber 280 where the fan 530 is located. Through such a setting mode, the airflow transmission path in the noise reduction device can be prolonged, so that a better sound reduction purpose can be achieved.

[0279] In some embodiments, as shown in FIG. 39b, the second flow guide pipe 712 penetrates the flange plate 31 and extends into the third chamber 330 to fluidly connect the second chamber 280 and the third chamber 330. The second flow guide pipe 712 penetrates the flange plate 31 and the first partition plate 210 (i.e. the middle shell 2) in sequence and extends into the second chamber 280 to fluidly connect the first chamber 270 and the second chamber 280. It is understood that since the first chamber 270 is located below the third chamber 330, the axial length of the first flow guide pipe 711 should be greater than the axial length of the second flow guide pipe 712 (please refer to FIG. 52).

[0280] In some embodiments, as shown in FIG. 36-FIG. 39b, the airflow path in the noise reduction device is as follows: the air enters the first chamber 270 from the air inlet 21 of the side wall of the lower shell 3, flows into the first flow guide pipe 711 in the first chamber 270, flows into the second chamber 280 through the first flow guide pipe 711, flows into the third chamber 330 through the second flow guide pipe 712, and enters the fan air inlet 533 from the third chamber 330. The air of the fan air outlet 534 is discharged from the fan sleeve air outlet 513 to the air outlet 11 on the top wall of the upper shell 1, and is discharged out of the noise reduction device.

[0281] Therefore, it can be seen that the air flow path in the noise reduction device is long, thereby achieving the purpose of reducing noise. Moreover, when the air flows in the chambers, it undergoes multiple changes in cross section of the flow chambers. For example, when the air enters the first chamber 270 from the air inlet 21, it enters the flow chamber (i.e. the first chamber 270) with a larger cross section from the air inlet 21 with a smaller cross section. Then, the air enters the first flow guide pipe 711 with a smaller cross section from the first chamber 270 with a larger cross section. Then, the air flows into the second chamber 280 with a larger cross section from the first flow guide pipe 711 with a smaller cross section. Then, the air enters the second flow guide pipe 712 with a smaller cross section from the second chamber 280 with a larger cross section. Then, the air flows into the third chamber 330 with a larger cross section from the second flow guide pipe 712 with a smaller cross section. Finally, the air enters the fan air inlet 533 with a smaller cross section from the third chamber 330 with a larger cross section. By making the air flow through the flow chambers with changing cross sections in sequence, the sound can be effectively and well absorbed and reduced.

[0282] In some embodiments, the first partition 210 is provided with a connecting groove 235, and the first flow guide pipe 711 can pass through the connecting groove 235 and extend into the first chamber 270 to communicate the first chamber 270 with the second chamber 280.

[0283] In some embodiments, as shown in FIGS. 63-65, the flow guide device includes a fluid chamber 76 for fluid flow, and the fluid chamber 76 includes a fluid inlet and a fluid outlet. In some embodiments, the fluid chamber 76 is used to guide the fluid flow from one chamber to another chamber of the noise reduction device, or to guide the fluid flow in one chamber of the noise reduction device, thereby achieving the purpose of reducing the noise of the noise reduction device. The fluid chamber 76 can extend along the axial direction of the flow guide device (or the subsequent flow guide body 73, the flow guide pipe 71, etc.), and thus the fluid direction of the fluid in the fluid chamber 76 is along the axial direction of the flow guide device (or the subsequent flow guide body 73, the flow guide pipe 71, etc.).

[0284] In some embodiments, the fluid chamber 76 is configured such that the fluid entering the fluid chamber from the fluid inlet undergoes at least one angle change before flowing out of the fluid chamber 76 from the fluid outlet. Specifically, the fluid entering the fluid chamber 76 can change its original fluid direction and flow out of the fluid chamber 76 after a certain angle change. The purpose of using such a flow guide structure is to change the direction of the fluid, so that the sound waves carried by the fluid change direction during transmission. The sound waves will be reflected and refracted during the change of direction, thereby consuming the energy of the sound waves, and thus achieving the purpose of reducing noise.

[0285] In some embodiments, the fluid flowing through the fluid inlet has a flow direction that forms an angle greater than 0° and less than 180° with the fluid flowing through the fluid outlet. It can be appreciated that by setting the angle, the fluid can change its original fluid direction and make an angle turn.

[0286] In some embodiments, as shown in FIGS. 63-65, the flow guide device includes a flow guide body 73, which has a fluid chamber 76 inside, and the flow guide body 73 includes a first end and a second end.

[0287] In some embodiments, the first end 78 of the flow guide body 73 is an open end, and the second end 79 is an open end or a closed end. The open end is an end that can communicate with the outside of the flow guide body. For example, fluid can flow into the inside of the flow guide body 73 through the first end 78, or fluid in the inside of the flow guide body 73 can flow out of the flow guide body 73 through the first end 78. In some embodiments, as shown in FIGS. 63-65, the first end 78 of the flow guide body 73 is a flat structure with a flat cross section. It can be envisaged that the first end 78 of the flow guide body 73 can also be a bevel structure, thereby forming a flow guide bevel 713. The closed end is an end that can isolate the flow guide body from the outside. It can be a structure of hard material or a structure of flexible material.

[0288] In some embodiments, the flow guide body 73 is configured such that the angle between the flow direction of the fluid flowing through the first end 78 of the flow guide body 73 and the flow direction of the fluid flowing through the second end 79 of the flow guide body 73 is 0°, or greater than 0° and less than 180°. The flow direction of the fluid flowing through the second end refers to the flow direction of the fluid after it turns at the second end 79. It can be appreciated that when the angle is 0°, the flow guide body 73 is in the form of a straight pipe; when the angle is greater than 0° and less than 180°, the flow guide body 73 is in the form of a bent pipe.

[0289] In some embodiments, one of the fluid inlet and the fluid outlet is configured as the first end 78 of the flow guide body 73, and the other of the fluid inlet and the fluid outlet is configured between the first end and the second end or as the second end 79 of the flow guide body 73.

[0290] In some embodiments, the flow guide body is configured such that the angle between the flow direction of the fluid flowing through the open end and the flow direction of the fluid flowing through the closed end is 0°; the first end of the flow guide body 73 is an open end, and the second end of the flow guide body 73 is a closed end; one of the fluid inlet and the fluid outlet is configured as the open end, and the other of the fluid inlet and the fluid outlet is configured on the side wall of the flow guide body between the open end and the closed end.

[0291] For example, as shown in FIGS. 63-65, when the flow guide body 73 is in the form of a straight tube, the fluid inlet is the first end 78, and the fluid outlet is a fluid hole 731 provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79, then the fluid enters the flow guide body 73 through the first end 78 and flows out of the flow guide body 73 through the fluid outlet. Conversely, when the fluid outlet is the first end 78, and the fluid inlet is a fluid hole 731 provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79, then the fluid enters the flow guide body 73 through the fluid hole 731 and flows out of the flow guide body 73 through the first end 78. When the flow guide body 73 is in the form of a straight tube, in order to make the fluid enter the fluid chamber 76 through the fluid inlet and flow out of the fluid chamber through the fluid outlet after at least one angle change, one end of the straight tube of the flow guide body 73 is configured as the fluid inlet, and the fluid outlet is provided on the side wall with an angle deflection relative to the one end of the straight tube to achieve the angle change from the fluid inlet to the fluid outlet.

[0292] For example, the fluid inlet is the first end 78, and the fluid outlet is a fluid hole 731 provided on the side wall of the flow guide tube between the first end 78 and the second end 79.

[0293] As shown in FIGS. 63-65, the fluid outlet is provided on one side wall of the flow guide body 73. Providing the fluid outlet on one side wall is beneficial when multiple flow guide tubes are provided in the same space (see the relevant content described later) to minimize the airflow influence of the fluid outlets of different flow guide tubes on each other, reduce noise, and reduce turbulence. For example, providing fluid outlets on both sides of the flow guide tube can affect the airflow of the fluid outlet of the flow guide tube on the opposite side.

[0294] Specifically, the fluid outlet is configured as a fluid hole 731 that penetrates one side wall of the flow guide body 73. The fluid hole 731 is a through hole, and its axial direction is substantially parallel to the radial direction of the flow guide body 73. Therefore, the angle between the axial direction of the fluid outlet (fluid hole 731) and the axial direction of the flow guide body 73 is substantially 90°. Since the angle between the flow direction of the fluid flowing through the first end 78 and the flow direction of the fluid flowing through the second end 79 is 0°, i.e., the fluid in the fluid chamber 76 flows along the axial direction of the flow guide body 73, and the fluid direction is along the axial direction of the flow guide body 73, at the fluid outlet (fluid hole 731), the fluid direction changes by substantially 90°, i.e., changes to flow along the radial direction of the flow guide body 73, and flows out of the fluid outlet (fluid hole 731). When the fluid changes the fluid direction by the above-mentioned turning, the sound waves will be reflected and refracted, thereby consuming their energy to achieve the purpose of noise reduction.

[0295] In some embodiments, the flow guide body is arranged such that the flow direction of the fluid flowing through the open end forms an angle with the flow direction of the fluid flowing through the closed end, and the angle is greater than 0° and less than 180°. In this case, the first end of the flow guide body 73 is an open end, and the second end of the flow guide body 73 is an open end or a closed end. When the second end of the flow guide body 73 is an open end, one of the fluid inlet and the fluid outlet is arranged at the first end of the flow guide body 73, and the other of the fluid inlet and the fluid outlet is arranged at the second end of the flow guide body 73. When the second end of the flow guide body 73 is a closed end, one of the fluid inlet and the fluid outlet is arranged at the first end of the flow guide body 73, and the other of the fluid inlet and the fluid outlet is arranged on the side wall of the flow guide body between the first end and the second end of the flow guide body.

[0296] For example, as shown in FIGS. 63-65, when the flow guide body 73 is in the form of an elbow pipe, one of the fluid inlet and the fluid outlet is arranged at the first end 78, and the other of the fluid inlet and the fluid outlet is arranged at the second end 79 or on the side wall of the flow guide body 73 between the first end 78 and the second end 79. If the second end 79 of the flow guide body 73 is an open end, the other of the fluid inlet and the fluid outlet is arranged at the second end 79 of the flow guide body 73.

[0297] In the case where the flow guide body 73 is in the form of an elbow pipe, one of the fluid inlet and the fluid outlet can be arranged directly at the second end 79 of the flow guide body 73, which is an open second end of the flow guide body 73, and the turning of the fluid can be achieved by the bending of the flow guide body 73 itself. Alternatively, one of the fluid inlet and the fluid outlet can be arranged on the side wall of the flow guide body 73 between the first end 78 and the second end 79, and the fluid can be turned once at the bending of the flow guide body 73 itself and turned again at the fluid outlet on the side of the second end 79. In the embodiments of the present disclosure, the fluid chamber 76 can enable the fluid entering the fluid chamber 76 through the fluid inlet to be turned at least once in angle before being discharged from the fluid chamber 76 through the fluid outlet, thereby changing the original direction of the fluid and achieving the purpose of noise reduction.

[0298] In some embodiments, the second end 79 of the flow guide body 73 is an integrally formed closed end. It can be understood that the second end 79 of the flow guide body 73 can be arranged as an integrally formed closed end of the flow guide body, which preferably ensures the sealing of the closed end and has good use reliability.

[0299] In some embodiments, as shown in FIGS. 66a-70c, the flow guide body 73 includes a flow guide pipe 71 and a covering element 77. The covering element 77 can be made of various materials, such as silicone material, hard material, etc. In some embodiments, the covering element is fixedly connected or detachably connected with the flow guide pipe.

[0300] In some embodiments, the covering element comprises an open first end 77-1 and a second end 77-2, which can be an open end or a closed end. The covering element is inserted or sleeved at the first end 71-1 of the flow guide tube through the first end 77-1 of the covering element; the second end 77-2 of the covering element covers the first end 71-1 of the flow guide tube; the position of the second end 77-2 of the covering element is higher than the first end 71-1 of the flow guide tube, and the second end 77-2 of the covering element is taken as the second end 79 of the flow guide body 73; and part of the sidewall of the covering element overlaps part of the sidewall of the flow guide tube. The first end 71-1 of the flow guide tube 71 is an open end or a closed end, and the second end 71-2 of the flow guide tube 71 is an open end. The second end 71-2 of the flow guide tube 71 is taken as the open first end of the flow guide body 73. The flow guide tube 71 can be a straight tube or a bent tube. The covering element can be a straight tube or a bent tube.

[0301] In some embodiments, a first through hole (for example, 731 in FIG. 66b) is formed on the sidewall of the covering element that does not coincide with the sidewall of the flow guide tube, as a fluid inlet or fluid outlet, in which case the first end 71-1 of the flow guide tube is an open end to ensure that the gas can flow from the flow guide tube to the first through hole, as shown in FIG. 66b; or a second through hole (for example, 731 in FIG. 66a) is formed on the sidewall of the covering element that coincides with the sidewall of the flow guide tube, as a fluid inlet or fluid outlet, in which case the first end 71-1 of the flow guide tube is an open end to ensure that the gas can flow from the flow guide tube to the second through hole, as shown in FIG. 66a; or a third through hole and a fourth through hole (for example, 7311 and 7312 in FIGS. 67-70a) are formed on the coinciding sidewalls of the flow guide tube and the covering element, as fluid inlets or fluid outlets, the axes of the third through hole and the fourth through hole coincide or do not coincide, in which case the first end 71-1 of the flow guide tube is an open end or a closed end, as shown in FIGS. 67-70a; or a fifth through hole (for example, 7311 in FIGS. 70b and 70c) is formed on the sidewall of the covering element that does not coincide with the sidewall of the flow guide tube, and a sixth through hole (for example, 7312 in FIGS. 70b and 70c) is formed on the sidewall of the covering element that coincides with the sidewall of the flow guide tube, as fluid inlets or fluid outlets, in which case the first end 71-1 of the flow guide tube is an open end or a closed end, as shown in FIGS. 70b-70c; or a seventh through hole is formed on the coinciding sidewalls of the flow guide tube and the covering element.

[0302] In some embodiments, the flow guide body 73 is in the form of a straight tube, one of the fluid inlet and the fluid outlet is the first end 78, and the other of the fluid inlet and the fluid outlet is provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79. The fluid outlet can be provided on the side wall of the covering element 77 which does not overlap with the side wall of the flow guide tube 71 (as shown in FIG. 66a and FIG. 66b), or on the side wall of the flow guide tube 71 which does not overlap with the side wall of the covering element 77, or on the side wall of the flow guide tube 71 which overlaps with the covering element 77. The fluid outlet is in communication with the fluid chamber 76. For example, the fluid inlet is the first end 78, and the fluid outlet is the fluid hole 731 provided on the side wall of the covering element 77 between the first end 78 and the second end 79. The fluid enters the flow guide body 73 through the first end 78 and flows out of the flow guide body 73 through the fluid outlet. Conversely, the fluid outlet is the first end 78, and the fluid inlet is the fluid hole 731 provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79. The fluid enters the flow guide tube 71 through the fluid hole 731 and flows out of the flow guide body 73 through the first end 78.

[0303] When the flow guide tube 71 and the covering element 77 are both straight tubes, the flow guide tube 71 and the covering element 77 form a straight tube flow guide body. At this time, the first end of the covering element 77 is a closed end, and the second end is an open end. In some embodiments, a first through hole is provided on the side wall of the covering element which does not overlap with the side wall of the flow guide tube as a fluid inlet or a fluid outlet. In this case, the first end 71-1 of the flow guide tube is an open end to ensure that the gas can flow from the flow guide tube to the first through hole, as shown in FIG. 66b. Alternatively, a second through hole (e.g., 731 in FIG. 66a) is provided on the side wall of the covering element which overlaps with the side wall of the flow guide tube as a fluid inlet or a fluid outlet. In this case, the first end 71-1 of the flow guide tube is an open end to ensure that the gas can flow from the flow guide tube to the second through hole, as shown in FIG. 66a. Alternatively, a third through hole and a fourth through hole (e.g., 7311 and 7312 in FIGS. 67-70a) are provided on the side wall of the flow guide tube which overlaps with the side wall of the covering element as a fluid inlet or a fluid outlet. The axes of the third through hole and the fourth through hole overlap or do not overlap. In this case, the first end 71-1 of the flow guide tube is an open end or a closed end, as shown in FIGS. 67-70a. Alternatively, a fifth through hole (e.g., 7311 in FIGS. 70b and 70c) is provided on the side wall of the covering element which does not overlap with the side wall of the flow guide tube, and a sixth through hole (e.g., 7312 in FIGS. 70b and 70c) is provided on the side wall of the flow guide tube which overlaps with the side wall of the covering element as a fluid inlet or a fluid outlet. In this case, the first end 71-1 of the flow guide tube is an open end or a closed end, as shown in FIGS. 70b-70c.

[0304] When the flow guide pipe 71 is a bent pipe and the covering element 77 is a straight pipe, or the flow guide pipe 71 is a straight pipe and the covering element 77 is a bent pipe, or the flow guide pipe 71 and the covering element 77 are both bent pipes, or when the flow guide pipe 71 and the covering element 77 form a bent flow guide body. At this time, the first end of the covering element 77 is an open end or a closed end, and the second end is an open end. The through hole arrangement when the flow guide pipe 71 and the covering element 77 are both straight pipes is still applicable to this embodiment, and on the basis thereof, a seventh through hole can also be formed in the coinciding side wall of the flow guide pipe and the covering element. At this time, the second end of the covering element can be an open end, serving as a fluid inlet or a fluid outlet.

[0305] Take the fluid inlet as the first end 78 and the fluid outlet as the fluid hole 731 provided on the side wall of the covering element 77 between the first end 78 and the second end 79 as an example for description.

[0306] Specifically, the flow guide body 73 is internally provided with a fluid chamber 76 extending along the axial direction thereof, and the fluid direction in the fluid chamber 76 is along the axial direction of the flow guide pipe 71. The covering element 77 has substantially the same shape as the flow guide pipe 71, that is, the covering element 77 is also configured in the form of a straight pipe. The covering element 77 is arranged at the end of the flow guide pipe 71, and part of the side wall thereof overlaps part of the side wall of the flow guide pipe 71 close to the end, that is, the covering element 77 can cover part of the flow guide pipe 71 and one end of the flow guide pipe 71 along the axial direction of the flow guide pipe 71.

[0307] As shown in FIGS. 66a and 66b, when the fluid outlet is provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79, the fluid outlet is a fluid hole 731 provided on the side wall of the covering element 77 and in fluid communication with the fluid chamber 76.

[0308] In this embodiment, both of the two opposite ends of the flow guide pipe 71 can be the first end 78 with an open structure, and one of the first ends 78 is covered with the covering element 77 to form the second end 79. The fluid enters the fluid chamber 76 from the first end 78 of the flow guide pipe 71 which is not covered by the covering element 77, flows along the fluid chamber 76, and then flows out from the fluid outlet (the fluid hole 731) on the covering element 77.

[0309] In the above embodiment, the fluid undergoes two angle changes. One of the angle changes occurs at the end of the flow guide pipe 71 covered by the covering element 77, and the other angle change occurs at the fluid outlet. Therefore, when the fluid changes the fluid direction by undergoing the above-mentioned changes, the sound wave will be reflected and refracted multiple times, thereby consuming its energy to achieve the purpose of noise reduction.

[0310] In some embodiments, the flow guide body 73 is in the form of an elbow pipe, one of the fluid inlet and fluid outlet is the first end 78, and the other is arranged on the second end 79. In the case that the flow guide body 73 is in the form of an elbow pipe, the second end 79 can also be formed by the covering element 77 arranged at the end of the flow guide body 73. As shown above, the covering element 77 is arranged at the end of the flow guide pipe 71, and a part of the side wall of the covering element 77 overlaps with a part of the side wall of the flow guide pipe 71 close to the end. The covering element 77 can only cover the end of the flow guide pipe 71 after the bending, i.e. the covering element 77 can only be in the form of a straight pipe. When one of the fluid inlet and fluid outlet is arranged on the second end 79, it can be located at the front end of the covering element 77 away from the first end 78 of the flow guide pipe 71, and the fluid outlet is in communication with the fluid chamber 76, then the turning of the fluid can be realized by the bending of the flow guide body 73 itself; or one of the fluid inlet and fluid outlet can also be arranged on the side wall of the flow guide body 73 between the first end 78 and the second end 79, then the fluid can be turned once at the bending of the flow guide body 73 itself, and turned twice at the fluid outlet on the side wall of the flow guide body 73.

[0311] In the embodiments in which one of the fluid inlet and fluid outlet is arranged on the side wall of the flow guide body 73 between the first end 78 and the second end 79, one of the fluid inlet and fluid outlet can be arranged on the side wall of the covering element 77 which does not overlap with the side wall of the flow guide pipe 71, or on the side wall of the flow guide pipe 71 which does not overlap with the side wall of the covering element 77, or on the side wall of the part of the flow guide pipe 71 which overlaps with the covering element 77.

[0312] In some embodiments, the covering element 77 can be arranged in the form of an elbow pipe, and the flow guide pipe 71 is arranged in the form of a straight pipe with both ends open. The covering element 77 is arranged on one of the open ends of the flow guide pipe 71 to form the second end 79. The turning of the fluid can be realized by the bending of the covering element 77, and the fluid outlet can be arranged at the front end or the side of the covering element 77.

[0313] In some embodiments, the fluid outlet or the fluid inlet can be arranged at the overlapping area where a part of the side wall of the covering element 77 overlaps with a part of the side wall of the flow guide pipe 71 close to the end.

[0314] In some embodiments, the flow guide pipe 71 is in the form of a straight pipe, one of the fluid inlet and the fluid outlet is the first end 78, the other of the fluid inlet and the fluid outlet is provided on the side wall of the cover element 77 and the side wall of the flow guide pipe 71 partially overlapping the cover element 77 (as shown in Figures 67-70c), and the fluid outlet is in communication with the fluid chamber 76. For example, the fluid inlet is the first end 78, and the fluid outlet is the first fluid hole 7311 provided on the side wall of the cover element 77 and the second fluid hole 7312 provided on the side wall of the flow guide pipe 71 partially overlapping the cover element 77, then the fluid enters the flow guide pipe 71 through the first end 78 and flows out of the flow guide pipe 71 through the first fluid hole 7311 and the second fluid hole 7312. Conversely, the fluid outlet is the first end 78, and the fluid inlet is the first fluid hole 7311 and the second fluid hole 7312, then the fluid enters the flow guide pipe 71 through the first fluid hole 7311 and the second fluid hole 7312, and flows out of the flow guide pipe 71 through the first end 78.

[0315] For example, the fluid inlet is the first end 78, and the fluid outlet is the first fluid hole 7311 provided on the side wall of the cover element 77 and the second fluid hole 7312 provided on the side wall of the flow guide pipe 71 partially overlapping the cover element 77.

[0316] Specifically, the flow guide pipe 71 is internally provided with a fluid chamber 76 extending along the axial direction of the flow guide pipe 71, and the fluid direction in the fluid chamber 76 is along the axial direction of the flow guide pipe 71. The cover element 77 has substantially the same shape as the flow guide pipe 71, and the cover element 77 is arranged at the end of the flow guide pipe 71, and part of the side wall of the cover element 77 overlaps part of the side wall of the flow guide pipe 71 close to the end, that is, the cover element 77 can cover part of the flow guide pipe 71 and cover one end of the flow guide pipe 71 along the axial direction of the flow guide pipe 71.

[0317] As shown in Figures 67-70c, when the fluid outlet is provided on the side wall of the flow guide body 73 between the first end 78 and the second end 79, the fluid outlet is provided on the side wall of the cover element 77 and the side wall of the flow guide pipe 71 partially overlapping the cover element 77, respectively. Among them, the fluid outlet on the side wall of the cover element 77 is the first fluid hole 7311, and the fluid outlet on the side wall of the flow guide pipe 71 partially overlapping the cover element 77 is the second fluid hole 7312, the first fluid hole 7311 and the second fluid hole 7312 are in fluid communication, and both are in fluid communication with the fluid chamber 76.

[0318] In this embodiment, one of the two opposite ends of the flow guide pipe 71 is an open end, and the other is an open end or a closed end. As shown in Figure 67, both of the two opposite ends of the flow guide pipe 71 are open ends, as shown in Figure 68, the second end (lower end) of the flow guide pipe 71 is an open end, and the first end (upper end) is a closed end.

[0319] Since the side wall of the flow guide pipe 71 is also provided with a fluid outlet (i.e. the second fluid hole 7312) which is in communication with the fluid outlet (i.e. the first fluid hole 7311) on the side wall of the covering element 77, the fluid can directly enter the second fluid hole 7312 from the first fluid hole 7311 and flow out to the outside of the flow guide pipe 71, and the end of the flow guide pipe 71 can be an open end or a closed end.

[0320] As shown in FIGS. 67 and 68, the first fluid hole 7311 and the second fluid hole 7312 are axially aligned with each other in the flow guide pipe 71, i.e. the axis of the first fluid hole 7311 coincides with the axis of the second fluid hole 7312.

[0321] As shown in FIG. 67, when both ends of the flow guide pipe 71 are open ends, the covering element 77 covers one of the open ends to make the fluid change direction; as shown in FIG. 68, when the end of the flow guide pipe 71 is a closed end, it can be an end integrally formed with the flow guide pipe 71, or a closed end formed by being blocked by the covering element 77.

[0322] For example, when both ends of the flow guide pipe 71 are open ends, one of the open ends (the lower end) of the flow guide pipe 71 serves as a fluid inlet, at this time the fluid in the fluid chamber 76 flows along the axial direction of the flow guide pipe 71, and the fluid direction is along the axial direction of the flow guide pipe 71, the fluid can flow out from the other open end of the flow guide pipe 71 to the space between the flow guide pipe 71 and the covering element 77, i.e. the fluid changes direction for the first time, and then flows out through the first fluid hole 7311, i.e. the fluid changes direction for the second time, this fluid flow mode is similar to the scheme of the embodiment 2, i.e. the fluid changes direction twice; or since the flow guide pipe 71 and the covering element 77 are both provided with fluid outlets, the fluid can also flow out from the flow guide pipe 71 to the second fluid hole 7312 and directly flow out through the first fluid hole 7311, i.e. the fluid changes direction once.

[0323] It is conceivable that, as shown in FIG. 69, on the basis of the embodiment shown in FIG. 67, the first fluid hole 7311 and the second fluid hole 7312 are axially staggered with each other in the flow guide pipe 71, i.e. the axis of the first fluid hole 7311 does not coincide with the axis of the second fluid hole 7312, but they are parallel to each other (or they can have an included angle therebetween). As shown in FIG. 69, the first fluid hole 7311 is higher than the second fluid hole 7312 in the axial direction of the flow guide pipe 71, or the first fluid hole 7311 can be lower than the second fluid hole 7312 in the axial direction of the flow guide pipe 71.

[0324] In addition, as shown in FIGS. 70a-70c, on the basis of the embodiment shown in FIG. 68, the first fluid hole 7311 and the second fluid hole 7312 are staggered in the axial direction of the flow guide pipe 71, that is, the axis of the first fluid hole 7311 and the axis of the second fluid hole 7312 do not coincide, but are parallel to each other (or an angle therebetween can be included). As shown in FIGS. 70a-70c, the first fluid hole 7311 is higher than the second fluid hole 7312 in the axial direction of the flow guide pipe 71, or the first fluid hole 7311 can also be lower than the second fluid hole 7312 in the axial direction of the flow guide pipe 71.

[0325] Since the first fluid hole 7311 and the second fluid hole 7312 are staggered in the axial direction of the flow guide pipe 71, when the fluid enters the first fluid hole 7311 from the fluid hole 731 on the flow guide pipe 71, the fluid can also be turned twice in angle.

[0326] In some embodiments, the flow guide pipe 71 is in the form of a bent pipe, one of the fluid inlet and the fluid outlet is the first end 78, and the other of the fluid inlet and the fluid outlet is provided on the second end 79. In the form of the bent pipe of the flow guide body 73, the second end 79 can also be formed by the covering element 77 provided on the end of the flow guide body 73. As shown above, the covering element 77 is provided on the end of the flow guide pipe 71, part of the side wall thereof overlaps part of the side wall of the flow guide pipe 71 close to the end, the covering element 77 has substantially the same shape as the flow guide pipe 71, and thus the covering element 77 is also configured in the form of a bent pipe. When the fluid outlet is provided on the second end 79, the fluid outlet is located at the end of the covering element 77 away from the first end of the flow guide pipe 71, and the fluid outlet communicates with the fluid chamber 76, the turning of the fluid can be realized by the bending of the flow guide body 73 itself; or the fluid outlet can also be provided on the side of the covering element 77, and then the fluid can be turned once at the bending of the flow guide body 73 itself and turned twice at the fluid outlet on the side of the covering element 77.

[0327] In some embodiments, the number of flow guide bodies is one or more, and when the number of flow guide bodies is multiple, the fluid chambers in the flow guide bodies communicate with each other, the fluid inlet is provided as one or more, and the fluid outlet is provided as one or more.

[0328] In some embodiments, the number of flow guide bodies is multiple, and each flow guide body corresponds to one fluid outlet, the aperture of the fluid outlet is 1 mm to 5 mm, and the radial distance between adjacent fluid outlets is 1 mm to 30 mm.

[0329] In some embodiments, the cross-sectional area of the fluid inlet is greater than or smaller than the cross-sectional area of the fluid outlet.

[0330] By making the cross-sectional area of the fluid inlet different from the cross-sectional area of the fluid outlet, the fluid will undergo compression and expansion when passing through the fluid outlet, thereby changing the state of the fluid, causing different frequencies of noise to interfere with each other and cancel out, and also causing more reflections and refractions, thereby achieving the purpose of noise reduction.

[0331] In some embodiments, the noise reduction device further comprises a gas resistance adjusting device 1000, which is arranged in the gas passage between the air inlet and the fan air inlet.

[0332] The gas passage 9 is a gas passage before the fan assembly of the ventilation therapy device inhales air, and its specific arrangement position can be selected according to the space in the ventilation therapy device. For example, as shown in FIGS. 58-62, the gas passage 9 flows with a first direction airflow or a second direction airflow, and the flow directions of the first direction airflow and the second direction airflow are substantially opposite. In some embodiments, the first direction airflow is the inhalation airflow inhaled by the patient end from the noise reduction device, and the second direction airflow is the exhalation airflow exhaled by the patient end.

[0333] In some embodiments, the gas resistance adjusting device 1000 is configured to make the gas resistance in the gas passage when the first direction airflow flows in the gas passage smaller than the gas resistance in the gas passage when the second direction airflow flows in the gas passage, wherein the first direction airflow and the second direction airflow are airflows with opposite flow directions. It can be understood that when the inhalation airflow flows in the gas passage 9, it corresponds to the ventilation therapy device providing ventilation gas to the patient, i.e., the inhalation mode of the patient; when the exhalation airflow flows in the gas passage 9, it corresponds to the exhalation mode of the patient, and the inhalation airflow and the exhalation airflow in the gas passage 9 are airflows with substantially opposite flow directions, and the gas resistance in the gas passage 9 when the inhalation airflow flows in the gas passage 9 is different from the gas resistance in the gas passage 9 when the exhalation airflow flows in the gas passage 9, and the latter is larger.

[0334] In some embodiments, the gas resistance adjusting device 1000 is arranged to make the ventilation cross-sectional area of the gas passage when the inhalation airflow flows in the gas passage larger than the ventilation cross-sectional area of the gas passage when the exhalation airflow flows in the gas passage. It can be understood that the gas resistance adjusting device 1000 can change the gas resistance of the gas passage 9 by changing the ventilation cross-sectional area of the gas passage 9 at its position.

[0335] In some embodiments, as shown in FIG. 60, the air resistance adjustment device 1000 includes a one-way valve flap 1010 capable of blocking a portion of the ventilation cross-section of the air passage 9. The one-way valve flap 1010 can have various shapes. For example, a rectangular flap shape, a circular flap shape, a circular flap shape, etc. It can be understood that the shape of the one-way valve flap 1010 can be adapted to the shape of the radial cross-section of the air passage 9. In some embodiments, the thickness of the one-way valve flap 1010 can be small, so as not to hinder the flow of the inhalation gas in the air passage 9 as much as possible.

[0336] In some embodiments, the one-way valve flap is movably connected in the air passage and is configured to change the cross-sectional area of the air passage at the location of the one-way valve flap. The one-way valve flap is configured to pass the inhalation gas through the air passage at the location of the one-way valve flap at a first cross-sectional area when the inhalation gas flows in the air passage, and pass the exhalation gas through the air passage at the location of the one-way valve flap at a second cross-sectional area when the exhalation gas flows in the air passage, wherein the second cross-sectional area is smaller than the first cross-sectional area. In some embodiments, the one-way valve flap is configured to open to increase the cross-sectional area of the air passage at the location of the one-way valve flap when the inhalation gas flows in the air passage, and close to decrease the cross-sectional area of the air passage at the location of the one-way valve flap when the exhalation gas flows in the air passage.

[0337] In some embodiments, as shown in FIGS. 58 and 59, the upper end of the one-way valve flap 1010 is rotationally connected with the air passage 9, so that the one-way valve flap 1010 can be rotated relative to the air passage 9 to a closed state, at which a portion of the ventilation cross-section (or all) of the air passage 9 is covered by the one-way valve flap 1010, so that the exhalation gas flowing therein is blocked by the one-way valve flap 1010 and can only flow through the portion of the air passage 9 not covered by the one-way valve flap 1010, so that the exhalation gas will pass through the air passage 9 with greater air resistance.

[0338] In some embodiments, as shown in FIGS. 61 and 62, the one-way valve flap 1010 is rotationally connected with the air passage 9, so that the one-way valve flap 1010 can be rotated relative to the air passage 9 to an open state, at which the air passage 9 is not covered by the one-way valve flap 1010, so that the inhalation gas flowing therein can pass through the air passage 9 with less air resistance than the exhalation gas.

[0339] In some embodiments, as shown in FIGS. 61 and 62, when the one-way valve flap 1010 is rotated clockwise relative to the gas passage 9 to the open state, the angle of rotation of the one-way valve flap 1010 relative to the gas passage 9 can be 0° to 90°. Preferably, the angle of rotation of the one-way valve flap 1010 relative to the gas passage 9 is 90°, i.e. the one-way valve flap 1010 is rotated relative to the gas passage 9 to be parallel to the axial direction of the gas passage 9, at which time the gas passage 9 is completely opened, and the actual gas passage cross-sectional area of the gas passage 9 is the radial cross-sectional area of the gas passage 9 (e.g. as shown in FIG. 58, the diameter of the gas passage 9 is D, and the radial cross-sectional area of the gas passage 9 is π(D / 2) 2 ).

[0340] In some embodiments, as shown in FIGS. 58 and 59, when the one-way valve flap 1010 is rotated counterclockwise relative to the gas passage 9 to the closed state, the maximum rotation position of the one-way valve flap 1010 is perpendicular to the axial direction of the gas passage 9, at which time the gas passage 9 can be completely blocked by the one-way valve flap 1010, and the gas passage cross-sectional area of the gas passage 9 is 0; or only a part of the gas passage 9 can be blocked by the one-way valve flap 1010, and the actual gas passage cross-sectional area of the gas passage 9 is (the radial cross-sectional area of the gas passage 9 - the cross-sectional area of the one-way valve flap 1010).

[0341] In some embodiments, the one-way valve flap is arranged to block at least 2 / 3 of the gas passage cross-sectional area at the position of the one-way valve flap when the exhalation gas flow flows in the gas passage.

[0342] In some embodiments, as shown in FIG. 59, the size of the one-way valve flap 1010 in the radial direction of the gas passage 9 is smaller than the radial diameter of the gas passage 9, i.e. when the one-way valve flap 1010 is rotated counterclockwise relative to the gas passage 9 to the closed state, there is still a certain distance between the lower end of the one-way valve flap 1010 and the inner wall of the gas passage 9 to form a gas passage cross-section for the exhalation gas. The reason for this arrangement is that if the gas passage 9 is completely blocked by the one-way valve flap 1010, i.e. the gas passage cross-sectional area of the gas passage 9 is 0, it will cause excessive resistance in the gas passage 9, which will make the patient feel difficult to exhale and reduce the comfort of use. Therefore, by allowing the one-way valve flap 1010 to block only a part of the gas passage cross-sectional area of the gas passage 9, for example, to block 2 / 3 of the gas passage cross-sectional area of the gas passage 9, the unblocked part of the gas passage 9 can be used for flowing exhalation gas, thereby ensuring the comfort of use.

[0343] In some embodiments, as shown in FIG. 59, the one-way valve sheet 1010 can completely block the gas passage 9 in the length direction when in the closed state, but not completely block the gas passage 9 in the width direction, so that the exhalation gas can flow into the gas passage 9 from the lower end of the one-way valve sheet 1010. Alternatively, the one-way valve sheet 1010 can not completely block the gas passage 9 in the length direction when in the closed state, but completely block the gas passage 9 in the width direction, so that the exhalation gas can flow into the gas passage 9 from the left end or the right end (or both ends) of the one-way valve sheet 1010. Alternatively, the one-way valve sheet 1010 can not completely block the gas passage 9 in the length direction when in the closed state, and also not completely block the gas passage 9 in the width direction, so that the exhalation gas can flow into the gas passage 9 from the left end, the right end, or the upper end and the lower end of the one-way valve sheet 1010.

[0344] In some embodiments, as shown in FIG. 60, the gas resistance adjusting device 1000 further comprises a rotating shaft 1020 connected to the gas passage, and the end of the one-way valve sheet 1010 is provided with a connecting portion 1030 fixedly connected to the rotating shaft 1020. The connecting portion 1030 can have various structures, for example, a columnar structure slightly bent to one side of the one-way valve sheet 1010. The rotating shaft 1020 is fixed to the end of the connecting portion 1030 so as to form a gap between the upper end of the one-way valve sheet 1010, thereby facilitating the rotation of the one-way valve sheet 1010.

[0345] In some embodiments, as shown in FIG. 59, a limiting member 91 is arranged in the gas passage 9, the one-way valve sheet is located on one side of the limiting member, and when the inhalation gas flows in the gas passage, the one-way valve sheet at least partially moves away from the limiting member to be in the open state, and when the exhalation gas flows in the gas passage, the one-way valve sheet abuts against the limiting member to be in the closed state. The limiting member 91 extends in the radial direction of the gas passage 9, the rotating shaft 1020 is rotatably arranged in the limiting member 91, and the one-way valve sheet 1010 is located on one side of the limiting member 91. As shown in FIG. 62, when the one-way valve sheet 1010 rotates in the first direction, it moves away from the limiting member 91, and when the one-way valve sheet 1010 rotates in the second direction, it moves close to the limiting member 91 to abut against the limiting member 91.

[0346] In some embodiments, the limiting member 91 can be arranged in the form of two parallel arranged blocking sheets. On the one hand, the two parallel arranged blocking sheets can form an airway in the gas passage 9, thereby guiding the gas. On the other hand, the two parallel arranged blocking sheets can provide support for the installation of the rotating shaft 1020 and limit the rotation of the one-way valve sheet 1010 in the second direction, i.e., the maximum position of the one-way valve sheet 1010 rotating in the second direction is abutting against one side of the blocking sheet (as shown in FIG. 59), thereby avoiding the phenomenon that the one-way valve sheet 1010 rotates in the second direction beyond the closed position and causes the gas resistance to increase again.

[0347] In some embodiments, as shown in FIGS. 59 and 61, the rotating shaft 1020 of the one-way valve piece 1010 is installed between two blocking pieces, and the spacing between the two blocking pieces is less than the axial direction of the rotating shaft 1020, so as to ensure that the rotating shaft 1020 cannot be pulled out from between the two blocking pieces. The two ends of the rotating shaft 1020 can be respectively arranged in grooves or holes on the two blocking pieces and can rotate in the grooves or holes. Bearings or other components that can facilitate the rotation of the rotating shaft 1020 can be arranged in the grooves or holes on the blocking pieces.

[0348] In some embodiments, as shown in FIGS. 58-61, a one-way valve piece 1010 is arranged in the gas passage 9, and one end (for example, the upper end) of the one-way valve piece 1010 is rotatably connected to the gas passage 9, that is, the lower end of the one-way valve piece 1010 can rotate relative to the upper end to open or close. When the inhalation gas flow flows in the gas passage 9, the one-way valve piece 1010 is at least partially away from the limiting piece 91 to be in an open state, and when the exhalation gas flow flows in the gas passage 9, the one-way valve piece 1010 abuts against the limiting piece 91 to be in a closed state. It should be noted that, in the preferred embodiment, when the one-way valve piece 1010 is in the closed state, the gas passage 9 at the position where the one-way valve piece 1010 is arranged is not completely closed and blocked, but the cross-sectional area of the gas passage 9 at the position is reduced compared with the open state.

[0349] In some embodiments, in the embodiment in which the one-way valve piece 1010 is rotatably connected to the gas passage 9, when the one-way valve piece 1010 is in the open state, one end of the one-way valve piece 1010 is connected to the limiting piece 91 or the gas passage 9, and the other end rotates relative to the fixed end to open the gas passage 9 at the position; when the one-way valve piece 1010 is in the closed state, the rotating end is reset to close the gas passage 9 at the position.

[0350] In some embodiments, when the one-way valve piece 1010 is connected to the limiting piece 91 or the gas passage 9 by a spring, when the one-way valve piece 1010 is in the open state, the one-way valve piece 1010 moves away from the limiting piece 91 under the action of the inhalation gas flow to be in the open state; and when the one-way valve piece 1010 is in the closed state, the one-way valve piece 1010 moves towards the limiting piece 91 under the action of the exhalation gas flow to be in the closed state.

[0351] In some embodiments, two one-way valve pieces 1010 can be arranged in the gas passage 9, and the two one-way valve pieces 1010 can provide a certain safety redundancy for the gas passage 9, so that when one of the one-way valve pieces 1010 cannot normally open, the exhalation gas flow can still flow through the other one-way valve piece 1010.

[0352] Specifically, the upper end of one of the one-way valve pieces 1010 can be rotationally connected with the gas passage 9, and the lower end of the other one-way valve piece 1010 can be rotationally connected with the gas passage 9, that is, the two one-way valve pieces 1010 are arranged opposite to each other in the radial direction of the gas passage 9, so that when the two one-way valve pieces 1010 are rotated to the open state or the closed state, the two one-way valve pieces 1010 are rotated in opposite directions, respectively. In addition, the two one-way valve pieces 1010 can have a gap therebetween, that is, when the two one-way valve pieces 1010 are rotated to the closed state, the gas passage 9 is not completely blocked by the two one-way valve pieces 1010, and the gap between the two one-way valve pieces 1010 can also be used to pass the exhalation gas, so as to avoid the discomfort of the patient from suffocation.

[0353] One of the embodiments of the present specification provides a ventilation therapy device comprising the above-mentioned noise reduction device.

[0354] The present application provides a ventilation therapy device comprising the above-mentioned noise reduction device, and further comprising a water tank, the noise reduction device being in fluid communication with the water tank, the gas flowing out of the gas outlet in the noise reduction device can enter the water tank for humidification, and the humidified gas can be provided for the patient to breathe. In addition, the ventilation therapy device can further comprise other components necessary for its functions, which can be implemented in various ways in the prior art, and the present application will not be repeated here.

[0355] One of the embodiments of the present specification provides a fan outer sleeve structure, which comprises a motor outer sleeve 520 (i.e. the aforementioned second fan sleeve 520), and the motor outer sleeve 520 is used to cover the motor part of the fan.

[0356] In some embodiments, the motor outer sleeve 520 is made of flexible material, for example, silicone material, which not only can fix the fan 530, thereby positioning the fan 530, but also can protect the motor part 532 of the fan 530, so that the motor part 532 can be ensured to be located at the designed position without being damaged.

[0357] Specifically, as shown in FIGS. 23, 24, 25 and 26, and please refer to FIGS. 18, 19, 21 and 22, the internal structure of the motor outer sleeve 520 has a cavity 522 penetrating through the motor outer sleeve 520 in the axial direction, and the cavity 522 can accommodate the motor part 532 of the fan 530.

[0358] Therefore, a cooling inflow passage 540 for flowing gas is formed between the inner wall of the cavity 522 and the outer wall of the motor part 532, and a gas outlet portion is further provided on the motor outer sleeve 520, the cooling inflow passage 540 is in fluid communication with the gas outlet portion, and the gas in the cooling inflow passage 540 can flow to the outside of the motor outer sleeve 520 through the gas outlet portion.

[0359] Further, as shown in FIG. 23, the inner wall of the cavity 522 is provided with support portions 523, which are configured to contact the outer wall of the motor portion 532 to support the motor portion 532. As shown in FIGS. 25 and 26, the support portions 523 protrude inwardly along the radial direction of the cavity 522 from the inner wall of the cavity 522, and extend along the axial direction of the cavity 522. Therefore, it can be understood that the support portions 523 and the inner wall of the cavity 522 jointly form the cooling inflow passages 540 for the gas to flow. The number of the support portions 523 can be, for example, at least two, and the at least two support portions 523 are spaced apart along the circumferential direction of the cavity 522, so as to support the motor portion 532 from at least two radial directions to ensure stability. As shown in FIG. 25, four support portions 523 are equally spaced apart along the circumferential direction of the cavity 522. On one hand, the equally spaced apart support portions 523 can facilitate processing; on the other hand, the four cooling inflow passages 540 can be formed between the support portions 523, so that the gas can flow uniformly through the surface of the motor portion 532, and the motor portion 532 can be uniformly cooled to ensure the performance of the motor portion 532.

[0360] Please refer to FIG. 18, as described above, the support portions 523 and the inner wall of the cavity 522 jointly form the cooling inflow passages 540 for the gas to flow. More specifically, the cooling inflow passages 540 are jointly defined by the inner wall of the cavity 522, the side walls of two adjacent support portions 523, and the outer wall of the motor portion 532. It can be understood that the number of the cooling inflow passages 540 corresponds to the number of the support portions 523, and the cooling inflow passages 540 also extend along the axial direction of the cavity 522.

[0361] Since the cavity 522 penetrates through the motor housing 520, the upper end of the cavity 522 is an open end, and the gas can enter the cooling inflow passages 540 from the upper end thereof, and flow along the cooling inflow passages 540, so as to exchange heat with the motor portion 532. Therefore, the gas can take away the heat of the motor portion 532 during the flow, so as to achieve the purpose of cooling the motor portion 532.

[0362] In the example shown in FIG. 23, the support portions 523 extend in a straight line along the axial direction of the cavity 522, and therefore the cooling inflow passages 540 defined by the support portions 523 and the inner wall of the cavity 522 are straight channels extending along the axial direction of the cavity 522, and the gas in the cooling inflow passages 540 flows along the axial direction of the cavity 522 through the outer wall of the motor portion 532.

[0363] It is conceived that the support portions 523 can also extend in a helical manner along the axial direction of the cavity 522, and the cooling inflow passage 540 defined by the support portions 523 and the inner wall of the cavity 522 is a helical flow channel extending in a helical manner along the axial direction of the cavity 522, so that the gas in the cooling inflow passage 540 can flow in a helical manner along the axial direction of the cavity 522 to the outer wall of the motor portion 532. In this way, the cooling inflow passage 540 can flow through the outer surface of the motor portion 532, thereby having a better cooling effect.

[0364] As shown in FIG. 25, and in combination with FIGS. 18 and 19, the gas outlet portion includes one or more second grooves 521 arranged at the end of the motor jacket 520. As shown in FIG. 24, each of the second grooves 521 is located between two adjacent support portions 523. The plurality of second grooves 521 extend along the axial direction of the motor jacket 520 and are spaced apart in the circumferential direction of the motor jacket 520. The plurality of second grooves 521 are in fluid communication with the cooling inflow passage 540, so that the gas in the cooling inflow passage 540 can flow to the outside of the motor jacket 520 through the second grooves 521. On the one hand, the gas can carry away part of the heat of the motor portion 532 during the flow process, thereby cooling and reducing the temperature of the motor portion 532 of the fan 530; on the other hand, the cooling inflow passage 540 can arrange and guide the flow of the gas, thereby also playing a role in reducing noise.

[0365] Further, please continue to refer to FIGS. 25 and 26, the support portions 523 are further provided with recessed portions 524 recessed inwardly along the radial direction of the cavity 522. By arranging the recessed portions 524, the contact area between the support portions 523 and the motor portion 532 is reduced, and a heat dissipation groove is formed between the support portions 523 and the motor portion 532, thereby further reducing the temperature of the motor portion 532.

[0366] As shown in FIGS. 23 and 24, the two ends of the support portions 523 are respectively provided with guide bevels 526 inclined toward the center of the cavity 522, which can guide the motor portion 532 to smoothly enter the cavity 522. As shown in FIG. 23, the guide bevel 526 of the upper end of the support portion 523 is inclined downward; as shown in FIG. 24, the guide bevel 526 of the lower end of the support portion 523 is inclined upward. Among them, the guide bevel 526 of the upper end of the support portion 523 can play a role in guiding and directing the airflow; in addition to the role in guiding the airflow, the guide bevel 526 of the lower end of the support portion 523 can also play a role in guiding the installation when the motor portion 532 is installed into the cavity 522.

[0367] As shown in FIG. 24 and FIG. 26, the outer side of the motor housing 520 is further provided with a plurality of annular protrusions 525. Please refer to FIG. 10, the protrusions 525 are used to contact the inner wall of the mounting hole 220, so as to reduce the contact area between the outer side of the motor housing 520 and the inner wall of the mounting hole 220, so that the motor housing 520 can be more easily installed into the mounting hole 220.

[0368] One of the embodiments of the present specification provides a noise reduction device, comprising the above-mentioned fan housing structure.

[0369] One of the embodiments of the present specification provides a ventilation therapy device, comprising the above-mentioned noise reduction device.

[0370] One of the embodiments of the present specification provides an air inlet structure of a ventilation therapy device, comprising a gas passage in which an airflow flows; and a gas resistance adjusting device arranged in the gas passage, the gas resistance adjusting device being configured to cause the gas resistance in the gas passage to be smaller when an airflow in a first direction flows in the gas passage than when an exhalation airflow in a second direction flows in the gas passage, wherein the airflow in the first direction and the airflow in the second direction are airflows in opposite directions.

[0371] In some embodiments, the airflow in the first direction is an inhalation airflow inhaled by a patient end from the ventilation therapy device, and the airflow in the second direction is an exhalation airflow exhaled by the patient end.

[0372] In some embodiments, the gas resistance adjusting device is configured to cause the ventilation cross-sectional area of the gas passage to be larger when the inhalation airflow flows in the gas passage than when the exhalation airflow flows in the gas passage.

[0373] In some embodiments, the gas resistance adjusting device comprises a one-way valve piece capable of shielding the ventilation cross section of the gas passage, the one-way valve piece being movably connected in the gas passage to change the cross-sectional area of the gas passage at the position thereof; the one-way valve piece being configured to cause the inhalation airflow to pass through the gas passage at the position of the one-way valve piece with a first cross-sectional area when the inhalation airflow flows in the gas passage, and to cause the exhalation airflow to pass through the gas passage at the position of the one-way valve piece with a second cross-sectional area when the exhalation airflow flows in the gas passage, wherein the second cross-sectional area is smaller than the first cross-sectional area.

[0374] In some embodiments, the one-way valve piece is configured to shield at least 2 / 3 of the ventilation cross section of the gas passage at the position thereof when the exhalation airflow flows in the gas passage.

[0375] In some embodiments, the gas resistance adjusting device further comprises a rotating shaft rotatably connected with the gas passage, and an end portion of the one-way valve piece is provided with a connecting portion fixedly connected with the rotating shaft.

[0376] In some embodiments, the one-way valve flap is configured to open to increase the cross-sectional area of the gas passage at the location where the one-way valve flap is located when the inhalation gas flow flows in the gas passage; and the one-way valve flap is configured to close to decrease the cross-sectional area of the gas passage at the location where the one-way valve flap is located when the exhalation gas flow flows in the gas passage.

[0377] In some embodiments, a stopper is arranged in the gas passage, the one-way valve flap is located at one side of the stopper, and the one-way valve flap is at least partially away from the stopper to be in the open state when the inhalation gas flow flows in the gas passage, and the one-way valve flap abuts against the stopper to be in the closed state when the exhalation gas flow flows in the gas passage.

[0378] The specific components of the air inlet structure can refer to the relevant descriptions of the corresponding components of the aforementioned air resistance adjusting device.

[0379] One of the embodiments of the present specification provides a ventilation therapy device, which comprises the air inlet structure of the aforementioned ventilation therapy device.

[0380] As shown in FIGS. 56 and 57, the ventilation therapy device 1100 (or breathing machine) further comprises a fan assembly (or fan) and a noise reduction shell (or noise reduction structure), the fan 530 is arranged in the noise reduction structure 5, the noise reduction structure 5 comprises an air inlet 21 communicating with external air, the fan 530 comprises a fan air inlet 533, a gas passage 9 is arranged in the noise reduction structure 5 between the air inlet 21 and the fan air inlet 533, and external air outside the noise reduction structure 5 is transmitted to the fan air inlet 533 through the gas passage 9.

[0381] The ventilation therapy device can be the ventilation therapy device 1100, as shown in FIGS. 56 and 57, the noise reduction structure 5 of the ventilation therapy device 1100 comprises an upper shell 1, a middle shell 2 and a lower shell 3, a first chamber 270 is formed between the lower shell 3 and the middle shell 2 and is sealed, a second chamber 280 is formed between the upper shell 1 and the middle shell 2 and is sealed, and a third chamber 330 is formed in the middle shell 2 and is sealed, wherein the first chamber 270 is in fluid communication with the second chamber 280, the second chamber 280 is in fluid communication with the third chamber 330, the fan 530 is located in the second chamber 280, and the fan air inlet 533 is exposed to the third chamber 330 to be in fluid communication with the third chamber 330. By arranging the above-mentioned multiple chambers, the noise of the fan 530 in the ventilation therapy device 1100 can be reduced.

[0382] As shown in FIGS. 56 and 58, the lower shell 3 is further provided with the air inlet 21, which is in fluid communication with the first chamber 270. The upper shell 1 is provided with the air outlet 11, which is in fluid communication with the air outlet of the fan 530.

[0383] The external air outside the noise reduction structure 5 enters the ventilation therapy device 1100 through the air inlet 21, and sequentially passes through the first chamber 270, the second chamber 280 and the third chamber 330, and then enters the fan 530 from the fan air inlet 533 for pressurization treatment. The air after the pressurization treatment can be output through the air outlet 11 for the patient to breathe.

[0384] It can be understood that the first direction of the airflow described above is the inhalation airflow in the inhalation direction of the patient, that is, the external air entering the noise reduction structure 5 through the air inlet 21 and flowing to the fan air inlet 533; the second direction of the airflow is the exhalation airflow in the exhalation direction of the patient, that is, the patient exhales and transmits in the noise reduction structure 5 in the opposite direction compared with the inhalation direction. The first chamber 270, the second chamber 280 and the third chamber 330 described above are all gas paths before the air inlet of the fan 530, so the gas passage 9 can be constructed in any one or more of the first chamber 270, the second chamber 280 and the third chamber 330. As shown in FIG. 58, since the gas passage 9 formed in the first chamber 270 is a relatively regular airway, it has a better space to set the gas resistance adjusting device 1000, and the air inlet 21 of the noise reduction structure 5 is located in the first chamber 270, so setting the gas resistance adjusting device 1000 in the airway of the gas passage 9 formed in the first chamber 270 can effectively prevent the exhalation airflow noise from being transmitted to the outside of the noise reduction structure 5 through the air inlet 21.

[0385] Specifically, the flow monitoring device 8 is arranged in the airway of the gas passage 9 in the first chamber 270, and the gas resistance adjusting device 1000 can be arranged at a position close to the air inlet side of the flow monitoring device 8 to avoid affecting the monitoring result of the flow monitoring device 8.

[0386] One of the embodiments of the present specification provides a flow guide device of a noise reduction device, comprising a fluid chamber for fluid flow, the fluid chamber comprising a fluid inlet and a fluid outlet, the fluid chamber being configured to pass through at least one angle turn for the fluid entering the fluid chamber from the fluid inlet and then flowing out of the fluid chamber from the fluid outlet.

[0387] In some embodiments, the fluid flow direction through the fluid inlet and the fluid direction through the fluid outlet have an included angle greater than 0° and less than 180°.

[0388] In some embodiments, the flow guide device comprises a flow guide body, an inner portion of the flow guide body is provided with a fluid chamber, the flow guide body comprises a first end and a second end; the flow guide body is arranged such that an included angle between a flow direction of fluid flowing through the first end and a flow direction of fluid flowing through the second end is 0°, or greater than 0° and less than 180°; the first end is an open end, and the second end is an open end or a closed end; one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged between the first end and the second end or at the second end.

[0389] In some embodiments, the flow guide body is arranged such that an included angle between a flow direction of fluid flowing through the open end and a flow direction of fluid flowing through the closed end is 0°; the first end is an open end, and the second end is a closed end; one of the fluid inlet and the fluid outlet is arranged at the open end, and the other of the fluid inlet and the fluid outlet is arranged on a side wall of the flow guide body between the open end and the closed end.

[0390] In some embodiments, the flow guide body is arranged such that an included angle between a flow direction of fluid flowing through the open end and a flow direction of fluid flowing through the closed end is greater than 0° and less than 180°; when the second end is an open end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged at the second end; when the second end is a closed end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged on a side wall of the flow guide body between the first end and the second end.

[0391] In some embodiments, the second end of the flow guide body is a one-piece closed end; or the flow guide body comprises a flow guide tube and a covering element; the covering element comprises a first end and a second end, the first end of the covering element is an open end, and the second end of the covering element is an open end or a closed end; the covering element is inserted into or sleeved on the first end of the flow guide tube through the first end of the covering element; the second end of the covering element covers the first end of the flow guide tube; the position of the second end of the covering element is higher than the first end of the flow guide tube, and the second end of the covering element is taken as the second end of the flow guide body; a part of the side wall of the covering element overlaps a part of the side wall of the flow guide tube; the first end of the flow guide tube is an open end or a closed end, and the second end of the flow guide tube is an open end, which is taken as the first end of the flow guide body.

[0392] In some embodiments, the first through hole is formed on the side wall of the covering element which does not coincide with the side wall of the flow guide pipe, as the fluid inlet or fluid outlet; or the second through hole is formed on the side wall of the covering element which coincides with the side wall of the flow guide pipe, as the fluid inlet or fluid outlet; or the third through hole and the fourth through hole are respectively formed on the side wall of the covering element which coincides with the side wall of the flow guide pipe, as the fluid inlet or fluid outlet; or the fifth through hole is formed on the side wall of the covering element which does not coincide with the side wall of the flow guide pipe, and the sixth through hole is formed on the side wall of the covering element which coincides with the side wall of the flow guide pipe, as the fluid inlet or fluid outlet.

[0393] In some embodiments, the axes of the third through hole and the fourth through hole coincide or do not coincide.

[0394] In some embodiments, the covering element is fixedly connected or detachably connected with the flow guide pipe.

[0395] In some embodiments, the number of flow guide bodies is one or more, and when the number of flow guide bodies is more than one, the fluid chambers in each flow guide body are in communication with each other, the fluid inlet is provided as one or more, and the fluid outlet is provided as one or more.

[0396] In some embodiments, the number of flow guide pipes is more than one, each flow guide pipe corresponds to one fluid outlet, the pore size of the fluid outlet is 1mm to 5mm, and the radial distance between adjacent fluid outlets is 1mm to 30mm.

[0397] In some embodiments, the cross-sectional area of the fluid inlet is greater than or less than the cross-sectional area of the fluid outlet.

[0398] For the specific components of the flow guide device, please refer to the relevant description of the corresponding components of the flow guide device described above.

[0399] As shown in FIGS. 71-77, one of the embodiments of the present specification provides a noise reduction device, which comprises the flow guide device described above. In addition, the noise reduction device further comprises at least one noise reduction chamber. When the noise reduction device comprises a plurality of noise reduction chambers, the flow guide structure is arranged in any one of the noise reduction chambers, or arranged between two noise reduction chambers for communicating the two noise reduction chambers.

[0400] Specifically, as shown in FIGS. 71-73, the noise reduction device comprises an upper shell 1, a lower shell 3, and a middle shell 2 located between the upper shell 1 and the lower shell 3. The upper shell 1 is located above the lower shell 3, and the upper shell 1 is provided with an air outlet 11. The air outlet 11 is located on the top wall of the upper shell 1. The side wall of the lower shell 3 is provided with an air inlet 21.

[0401] As shown in FIGS. 72 and 73, the interior of the lower shell 3 forms a recessed chamber into which air can enter through the air inlet 21; as shown in FIGS. 71 and 72, the interior of the upper shell 1 forms a recessed chamber in which air can exit from the air outlet 11 out of the noise reduction device, where the arrows in FIGS. 72 and 73 show the direction of fluid (air) flow.

[0402] As shown in FIG. 72, the noise reduction device is provided with 3 noise reduction chambers, which are the first chamber 270 formed between the recessed chambers of the middle shell 2 and the lower shell 3, the second chamber 280 formed between the recessed chamber of the upper shell 1 and the middle shell 2, and the third chamber 330 formed in the interior of the middle shell 2. The fan assembly 530 is located in the second chamber 280, and the fan air inlet 533 of the fan assembly 530 is exposed in the third chamber 330 so as to be in fluid communication with the third chamber 330.

[0403] For such a noise reduction device with 3 noise reduction chambers, the number of flow guide structures is two, which is one less than the number of noise reduction chambers. One of the flow guide structures is used to communicate the first chamber 270 and the second chamber 280, and the other flow guide structure is used to communicate the second chamber 280 and the third chamber 330.

[0404] As shown in FIG. 72, the two flow guide structures are the first flow guide structure 74 and the second flow guide structure 75, which are respectively located on the left and right sides of the fan assembly 530. The first flow guide structure 74 on the left side is used to communicate the first chamber 270 and the second chamber 280, and the second flow guide structure 75 on the right side is used to communicate the second chamber 280 and the third chamber 330.

[0405] Please refer to FIG. 72, air enters the first chamber 270 from the air inlet 21 on the lower shell 3, and the first end (lower end) of the first flow guide structure 74 is an open end, which is located in the first chamber 270 so as to be in fluid communication with the first chamber 270. The first flow guide structure 74 is as shown in the above embodiments, where the fluid inlet is the open end of the first flow guide structure 74, and the fluid outlet is located between the first end 78 and the second end 79 of the flow guide body 73 or on the second end 79, and is located in the second chamber 280 so as to be in fluid communication with the second chamber 280. Therefore, the fluid in the first chamber 270 enters the flow guide body 73 of the first flow guide structure 74 through the lower end thereof, and flows along the fluid chamber 76 in the flow guide body 73, and flows out from the fluid port on the side of the flow guide body 73 to the second chamber 280. As shown in the above embodiments, the fluid makes at least one angle turn in the flow, so as to reduce noise.

[0406] The first end (lower end) of the second flow guiding structure 75 is an open end, located in the third chamber 330, thus communicating with the third chamber 330 in fluid communication. As shown in the above embodiment, the fluid outlet of the second flow guiding structure 75 is the open end of the first flow guiding structure 74, and the fluid inlet is located between or on the second end 79 of the flow guiding body 73, and is located in the second chamber 280, thus communicating with the second chamber 280 in fluid communication. Fluid in the second chamber 280 flows from the fluid inlet of the second flow guiding structure 75 into its flow guiding body 73, and flows along the fluid chamber 76 of the flow guiding body 73 to the first end (lower end) of the second flow guiding structure 75, thereby entering the third chamber 330. As shown in the above embodiment, the fluid undergoes at least one angular deflection during flow to reduce noise.

[0407] The fluid in the third chamber 330 can enter the fan assembly 530 through the fan inlet 533 for pressurization. The pressurized air flows out from the fan outlet 530 to the air outlet 11 and is supplied to the patient for breathing.

[0408] As shown in Figures 74-77, and referring to Figure 72, the fluid outlet (e.g., fluid hole 731) in the first flow guiding structure 74 and the fluid inlet (e.g., fluid hole 731) in the second flow guiding structure 75 are both located in the second chamber 280. Furthermore, as shown in Figures 74 and 77, the fluid outlet (e.g., fluid hole 731) in the first flow guiding structure 74 is located inside the flow guiding body 73, i.e., on the side facing the fan assembly 530, while the fluid inlet (e.g., fluid hole 731) in the second flow guiding structure 75 is located outside the flow guiding body 73, i.e., on the side away from the fan assembly 530. Therefore, it can be seen that the air flowing out from the fluid outlet (e.g., fluid hole 731) in the first flow guiding structure 74 needs to cross the fan assembly 530 to reach the other side of the fan assembly 530 before entering through the fluid inlet (e.g., fluid hole 731) in the second flow guiding structure 75. This prolongs the airflow path, causing some of the energy carried to attenuate, thus further reducing noise.

[0409] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0410] Also, the use of "a" or "an" or "the" are intended to include both singular and the plural, unless the context clearly indicates otherwise. Additionally, the use of "one" or "one" is intended to mean "at least one", "one or more" or "one or more", unless otherwise indicated by context. Furthermore, the use of the term "including" as well as other forms for, e.g., "include", "includes", "included", "including", "contain", "containing", "contains", "carry", "carrying", "carries", or "comprising" are not limiting and are used for clarity only. The use of "e.g." means "for example" and is used for explanation only. It is to be noted that the use of certain terms, such as "first", "second", "third", etc., are used herein solely for purposes of description and do not constitute a limitation on the scope of uses of the various embodiments of the present disclosure. It is to be noted that the use of the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or as is clear from the context of the surrounding disclosure, the use of "or" in this disclosure is intended to mean "and / or" unless it is explicitly stated otherwise. It is to be further noted that the use of the term "about" is intended to mean "approximately" or "around", unless otherwise explicitly stated.

[0411] Also, the order of execution or performance of the elements of the embodiments of the disclosure illustrated and described herein is not essential, unless otherwise specified. Moreover, it is recognized that a plurality of hardware and software based devices and circuits can be utilized to implement the elements of the embodiments of the present disclosure, and that such devices and circuits can be interconnected in any combination suitable to implement the elements of the embodiments of the disclosure. Also, while the embodiments of the present disclosure have been described in the context of a few embodiments, it should be recognized that where equivalents are functional, they have been and can be utilized. For example, although specific configurations of the system components have been described above, the described system can also be implemented by only software solutions, such as installing the described system on existing servers or mobile devices.

[0412] Similarly, it is to be noted that, for reasons of convenience and conciseness, and to not unnecessarily obscure the teachings of the present disclosure, the description of the embodiments of the present disclosure set forth herein and depicted in the drawings can have omitted certain features that are not necessary for an understanding of the present disclosure. However, it should be appreciated that the teaching of the present disclosure can include at least one of these features.

[0413] Some embodiments use numerical descriptors to describe compositions, amounts of attributes. It should be understood that such numerical descriptors used in the description of embodiments are, in some examples, modified by the adjectives "about", "approximately", or "generally". Unless otherwise stated, "about", "approximately", or "generally" means that the number allows for ±20% variation. Accordingly, in some embodiments, numerical parameters in the description and claims are approximations that can vary depending on the requirements of the particular embodiments. In some embodiments, numerical parameters should be considered in the context of the number of significant digits used for measurement and the acceptable error for the measurement at hand. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of equivalence in the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, can contain certain errors associated with testing measurements.

[0414] Each patent, patent application, patent publication, and other material cited in this specification is hereby incorporated by reference in its entirety herein for the teachings relevant to the sentence and / or paragraph in which the reference is presented. Document histories, to the extent not inconsistent with the pertinent prior art, are also incorporated by reference herein for the teachings relevant to the sentence and / or paragraph in which the reference is presented. To the extent that any meaning or definition of a term in this specification conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this specification shall govern.

[0415] Finally, it should be understood that the embodiments described herein are merely exemplary of the principles of the present description. Other variations having essentially the same structure and function are within the scope of the present description. Thus, while the present description has been described with respect to exemplary embodiments, it will be understood that the present description is not limited to these embodiments.

Claims

1. A casing structure of a fan, characterized by comprising: The outer sleeve structure comprises a first fan sleeve configured to cover a volute portion of the fan, the fan comprising a fan air inlet, one end of the first fan sleeve having a fan sleeve air inlet corresponding to the fan air inlet, the fan sleeve air inlet being coaxial with the fan air inlet; The surface of the first fan sleeve on the side close to the fan sleeve air inlet is provided with a hanging structure, the hanging structure extending outward along the axial direction of the first fan sleeve from the surface of the first fan sleeve, the hanging structure comprising a limiting portion configured to limit the movement of the first fan sleeve within a preset range when the first fan sleeve is fixedly installed.

2. The jacket structure of claim 1, wherein The surface of the first fan sleeve on the side close to the fan sleeve air inlet is provided with a support structure, the support structure extending outward along the axial direction of the first fan sleeve from the surface of the first fan sleeve, the support structure being configured to contact the installation surface with the free end of the support structure when the first fan sleeve is fixedly installed.

3. The jacket structure of claim 2, wherein, The number of the hanging structures is at least two, the at least two hanging structures being spaced apart along the circumferential direction of the first fan sleeve, the support structure being arranged between the hanging structures along the circumferential direction of the first fan sleeve, the axial extension length of the hanging structure being greater than the axial extension length of the support structure.

4. The jacket structure of claim 2 or 3, wherein, The axial end surface of the support structure has one or more sound reduction channels, the sound reduction channels being provided as grooves or sound reduction holes on the support structure, the sound reduction channels being configured to allow airflow to enter the fan air inlet through the sound reduction channels when the first fan sleeve is fixedly installed.

5. The jacket structure of any of claims 1-4, wherein, The hanging structure comprises an ear extending along the axial direction of the first fan sleeve, the limiting portion being arranged on both sides of the ear and protruding from the surface of the ear.

6. The jacket structure of claim 5, wherein, The limiting portion is arranged as a baffle structure extending obliquely from the surface of the ear away from the free end of the ear.

7. The jacket structure of claim 5 or 6, wherein, The ear has an arc-shaped structure.

8. The jacket structure of any of claims 5-7, wherein, The free end of the ear is provided with an installation guide portion, the surface of the installation guide portion being provided with an anti-slip operation structure.

9. The jacket structure of any of claims 1-8, wherein, The side of the first fan sleeve away from the fan sleeve air inlet is provided with a flexible buffer structure extending along the axial direction of the first fan sleeve from the surface of the first fan sleeve, the extension direction of the buffer structure being opposite to the extension direction of the hanging structure, the buffer structure being configured such that the top end of the free end of the buffer structure is higher than the top end of the motor of the fan when the first fan sleeve is installed on the fan.

10. The jacket structure of claim 9, wherein, The number of the buffer structures is at least two, the at least two buffer structures being spaced apart along the circumferential direction of the first fan sleeve and surrounding the motor of the fan.

11. The jacket structure of claim 9 or 10, wherein, The buffer structure and the first fan sleeve are a split structure or an integrally formed structure.

12. The jacket structure of any one of claims 1-11, wherein, The outer sleeve structure further comprises a second fan sleeve arranged on the side of the first fan sleeve away from the fan sleeve air inlet, the second fan sleeve being configured to cover the motor portion of the fan.

13. The jacket structure of claim 12, wherein, The second fan sleeve and the first fan sleeve are a split structure or an integrally formed structure.

14. The jacket structure of claim 12 or 13, wherein, An inner portion of the second fan cover is provided with a cavity penetrating through the second fan cover along an axial direction of the second fan cover, and the cavity is configured to accommodate the motor portion of the fan; An inner wall of the cavity and an outer wall of the motor portion form a cooling inflow channel for gas flow, and the second fan cover is further provided with a gas outlet portion, the cooling inflow channel is in fluid communication with the gas outlet portion, and the gas in the cooling inflow channel can flow to the outside of the second fan cover through the gas outlet portion.

15. The jacket structure of claim 14, wherein, The gas outlet portion includes one or more grooves provided at an end of the second fan cover close to the first fan cover along the axial direction of the second fan cover, the one or more grooves extend along the axial direction of the second fan cover and are spaced apart in a circumferential direction of the second fan cover, and the gas in the cooling inflow channel can flow to the outside of the second fan cover through the one or more grooves.

16. The jacket structure of claim 14 or 15, wherein, The inner wall of the cavity is provided with a support portion configured to be in contact with the outer wall of the motor portion to support the motor portion, and the support portion and the inner wall of the cavity jointly form the cooling inflow channel for gas flow.

17. The jacket structure of claim 16, wherein The support portion protrudes inwardly from the inner wall of the cavity along a radial direction of the cavity, and the support portion extends along an axial direction of the cavity, wherein the support portion is further provided with a recessed portion recessed inwardly along the radial direction of the cavity.

18. The jacket structure of claim 16 or 17, wherein, The number of the support portions is at least two, and the at least two support portions are spaced apart in the circumferential direction of the cavity.

19. The jacket structure of any of claims 16-18, wherein, The support portion is provided with a guide slope inclined toward the center of the cavity at two ends along the axial direction of the cavity.

20. The jacket structure of any of claims 16-19, wherein, The outer wall of the second fan cover is further provided with a plurality of annular protrusions.

21. The jacket structure of any one of claims 1-20, wherein, The outer cover structure further includes a third fan cover, and the fan includes a fan air outlet, and the third fan cover is configured to cover the fan air outlet.

22. The jacket structure of claim 21, wherein, The first fan cover and the third fan cover are in a split structure or an integrally formed structure.

23. A noise reduction device, characterized by An outer cover structure including the fan of any one of claims 1-22.

24. A ventilation therapy apparatus characterised by A noise reduction device of claim 23.

25. A noise reduction device of a ventilation therapy apparatus, comprising: a first chamber provided with a gas inlet for receiving gas; a second chamber configured to accommodate a fan; a third chamber in which a fan air inlet of the fan is exposed; the three chambers are arranged along an axial direction of the fan, the first chamber is in fluid communication with the second chamber, and the second chamber is in fluid communication with the third chamber; the gas entering through the gas inlet can flow in the first chamber, the second chamber and the third chamber in sequence, and finally flow to the fan air inlet.

26. The noise reducing device of claim 25, wherein, The noise reduction device further comprises: an upper shell, a middle shell, a lower shell, a first partition and a second partition configured to form a first chamber, a second chamber and a third chamber; the second partition is provided with a ventilation opening, so that the fan air inlet is exposed to the third chamber through the ventilation opening.

27. The noise reducing device of claim 26, wherein, The noise reduction device further comprises: A second fan cover configured to cover a motor portion of the fan, an inner portion of the second fan cover being provided with a cavity extending through the second fan cover in an axial direction of the second fan cover, the cavity being configured to accommodate the motor portion; a cooling inflow passage for flowing gas is formed between an inner wall of the cavity and an outer wall of the motor portion, the second fan cover is further provided with a gas outlet portion, the cooling inflow passage is in fluid communication with the gas outlet portion, and the gas in the cooling inflow passage is capable of flowing to an outside of the second fan cover through the gas outlet portion.

28. The noise reducing device of claim 27, wherein, The first partition plate and the upper shell form a first chamber; The first partition plate, the second partition plate, and the middle shell form a second chamber; The second partition plate and the lower shell form a third chamber; The first chamber is provided with a first gas inlet for receiving a first gas and a second gas inlet for receiving a second gas.

29. The noise reducing device of claim 28, wherein, The upper shell comprises: a first gas chamber for receiving the first gas; a second gas chamber for receiving the second gas, the first gas chamber being in fluid communication with the second gas chamber; and a mixing baffle comprising a plurality of baffle pieces extending in a depth direction of the first gas chamber or the second gas chamber and a mixing chamber surrounded by the plurality of baffle pieces, the plurality of baffle pieces being spaced apart to form baffle openings between adjacent baffle pieces, the first gas chamber or the second gas chamber being capable of being in fluid communication with the mixing chamber through the baffle openings, the mixing chamber being in fluid communication with the cooling inflow passage.

30. The noise reducing device of claim 29, wherein, The first partition plate is provided with a mounting hole extending through the first partition plate, the second fan cover is arranged in the mounting hole, a portion of the mounting hole extends into the mixing chamber, and there is a gap between the mixing chamber and an outer wall of the mounting hole.

31. The noise reducing device of claim 30, wherein, The first partition plate is further provided with an annular baffle, the annular baffle is located in the second chamber and is arranged outside the mounting hole, in an axial direction of the mounting hole, an end portion of the annular baffle extends beyond an end portion of the mounting hole.

32. A noise reducing device according to any one of claims 29-31, characterized in that The noise reduction device further comprises a first gas inlet pipe configured to receive the first gas; The first partition plate is provided with the first gas inlet, a first side wall of the middle shell is provided with a third gas inlet, and axes of the first gas inlet and the third gas inlet are perpendicular to each other; wherein a first end of the first gas inlet pipe extends through the first gas inlet and into the first gas chamber, and a second end of the first gas inlet pipe extends through the third gas inlet and outside the first side wall of the middle shell.

33. The noise reducing device of any one of claims 26-32, wherein, The second partition plate and the upper shell form a second chamber; The first partition plate, the second partition plate, and the middle shell form a third chamber; The first partition plate and the lower shell form a first chamber.

34. The noise reducing device of claim 33, wherein, The first chamber comprises a first flow passage extending inside the lower shell and making a gas inlet end of the first flow passage in fluid communication with an air inlet of the lower shell and a gas outlet end of the first flow passage in communication with the second chamber.

35. The noise reducing device of claim 34, wherein, The first flow channels are provided in plurality, and the air inlet ends of the plurality of first flow channels are arranged side by side, and the air outlet ends of the plurality of first flow channels are diverged along the radial direction of the volute portion of the fan.

36. The noise reducing device of any one of claims 26-35, wherein, The noise reduction device further comprises: A first fan cover configured to cover the volute portion of the fan, the fan comprising a fan air inlet, one end of the first fan cover having a fan cover air inlet corresponding to the fan air inlet, the fan cover air inlet being coaxial with the fan air inlet; The surface of the first fan cover on the side close to the fan cover air inlet is provided with a hanging structure, the hanging structure extending outward along the axial direction of the first fan cover, the hanging structure comprising a limiting portion configured to limit the movement of the first fan cover within a predetermined range when the first fan cover is fixedly installed.

37. The noise reducing device of claim 36, wherein, The second partition plate is provided with a hanging groove corresponding to the hanging structure, the hanging structure passes through the hanging groove, and the limiting portion is located below the hanging groove.

38. The noise reducing device of claim 37, wherein, The hanging groove is provided as an expanded groove, the width of the side of the expanded groove facing the first fan cover being greater than the width of the side away from the first fan cover.

39. The noise reducing device of any one of claims 26-38, wherein, A flow guide cone is arranged at a position opposite to the fan air inlet in the third chamber, the flow guide cone being configured to guide the airflow in the third chamber to the fan air inlet; Along the axial direction of the fan, the flow guide cone is arranged below the fan air inlet and extends towards the fan air inlet, the flow guide cone being coaxial with the fan air inlet, the flow guide cone being a conical structure with a diameter decreasing towards the fan air inlet.

40. The noise reducing device of any one of claims 26-39, wherein, One or more of the upper shell, the middle shell and the lower shell are further provided with at least one resonance cavity, the resonance cavity being configured to enable the airflow in the resonance cavity to resonate with external sound waves of a specific frequency.

41. The noise reducing device of any one of claims 26-40, wherein, The noise reduction device further comprises a flow guide device, the flow guide device extending to two of the first chamber, the second chamber and the third chamber along the axial direction of the fan, the two chambers being in fluid communication through the flow guide device.

42. The noise reducing device of claim 41, wherein, The flow guide device comprises at least one flow guide pipe extending along the axial direction of the fan; and / or The flow guide pipe is provided with a flow guide inclined surface at the end corresponding to the fluid inlet.

43. A noise reducing device according to claim 41 or 42, characterised in that The flow guide device comprises a fluid chamber for fluid flow, the fluid chamber comprising a fluid inlet and a fluid outlet, the fluid chamber being configured such that the fluid entering the fluid chamber through the fluid inlet undergoes at least one angle change before flowing out of the fluid chamber through the fluid outlet.

44. The noise reducing device of claim 43, wherein, The fluid flowing through the fluid inlet and the fluid flowing through the fluid outlet have an included angle greater than 0° and less than 180°.

45. A noise reducing device according to claim 43 or 44, characterised in that The flow guide device comprises a flow guide body, the interior of the flow guide body being provided with the fluid chamber, the flow guide body comprising a first end and a second end; The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the first end and the flow direction of the fluid flowing through the second end is 0°, or greater than 0° and less than 180°; The first end is an open end, and the second end is an open end or a closed end; One of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged between the first end and the second end or arranged at the second end.

46. The noise reducing device of claim 45, wherein, The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the open end and the flow direction of the fluid flowing through the closed end is 0°; The first end is the open end, and the second end is the closed end; One of the fluid inlet and the fluid outlet is arranged at the open end, and the other of the fluid inlet and the fluid outlet is arranged on the side wall of the flow guide body between the open end and the closed end.

47. The noise reducing device of claim 45, wherein, The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the open end and the flow direction of the fluid flowing through the closed end is greater than 0° and less than 180°; When the second end is the open end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged at the second end; When the second end is the closed end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged on the side wall of the flow guide body between the first end and the second end.

48. The noise reducing device of any one of claims 45-47, wherein, The second end of the flow guide body is an integrally formed closed end; or The flow guide body comprises the flow guide pipe and a covering element; the covering element comprises a first end and a second end, the first end of the covering element is an open end, the covering element is inserted into or sleeved on the first end of the flow guide pipe through the first end of the covering element; the second end of the covering element covers the first end of the flow guide pipe; the position of the second end of the covering element is higher than the first end of the flow guide pipe, and the second end of the covering element is taken as the second end of the flow guide body; part of the side wall of the covering element overlaps part of the side wall of the flow guide pipe; the first end of the flow guide pipe is an open end or a closed end, and the second end of the flow guide pipe is an open end, and the second end of the flow guide pipe is taken as the first end of the flow guide body.

49. The noise reduction device of claim 48, wherein, a first through hole is formed on the side wall of the covering element which does not coincide with the side wall of the flow guide pipe, as the fluid inlet or the fluid outlet; or a second through hole is formed on the side wall of the covering element which coincides with the side wall of the flow guide pipe, as the fluid inlet or the fluid outlet; or a third through hole and a fourth through hole are respectively formed on the coinciding side walls of the flow guide pipe and the covering element, as the fluid inlet or the fluid outlet; or a third through hole and a fourth through hole are respectively formed on the coinciding side walls of the flow guide pipe and the covering element, as the fluid inlet or the fluid outlet; or A fifth through hole is formed on the side wall of the cover element which does not coincide with the side wall of the draft tube, and a sixth through hole is formed on the side wall of the cover element which coincides with the draft tube, as the fluid inlet or the fluid outlet. A seventh through hole is formed on the side wall of the cover element which coincides with the draft tube.

50. The noise reducing device of claim 49, wherein, The axes of the third through hole and the fourth through hole coincide or do not coincide.

51. The noise reducing device of any one of claims 48-50, wherein, The cover element is fixedly connected or detachably connected with the draft tube.

52. The noise reducing device of any one of claims 45-51, wherein, The number of the draft tubes is one or more, and when the number of the draft tubes is more than one, the fluid chambers in the draft tubes are connected with each other, the fluid inlet is provided as one or more, and the fluid outlet is provided as one or more.

53. The noise reducing device of claim 52, wherein, When the number of the draft tubes is more than one, each of the draft tubes corresponds to one of the fluid outlets, the aperture of the fluid outlet is 1 mm to 5 mm, and the radial distance between adjacent fluid outlets is 1 mm to 30 mm.

54. The noise reducing device of any one of claims 43-53, wherein, The cross-sectional area of the fluid inlet is greater than or smaller than the cross-sectional area of the fluid outlet.

55. The noise reducing device of any one of claims 25-54, wherein, The noise reduction device further comprises: The air resistance adjusting device is arranged in the gas passage between the air inlet and the fan air inlet, and is configured to make the air resistance when the gas flows in the first direction smaller than the air resistance when the gas flows in the second direction, wherein the gas flowing in the first direction and the gas flowing in the second direction are gas flows in opposite directions.

56. The noise reducing device of claim 55, wherein, The gas flowing in the first direction is the inhalation gas flow inhaled by the patient end through the noise reduction device, and the gas flowing in the second direction is the exhalation gas flow exhaled by the patient end.

57. The noise reducing device of claim 56, wherein, The air resistance adjusting device is arranged to make the ventilation cross-sectional area of the gas passage when the inhalation gas flow flows in the gas passage larger than the ventilation cross-sectional area of the gas passage when the exhalation gas flow flows in the gas passage.

58. The noise reducing device of claim 57, wherein, The air resistance adjusting device comprises a one-way valve plate capable of shielding the ventilation cross section of the gas passage, and the one-way valve plate is movably connected in the gas passage and is configured to change the cross-sectional area of the gas passage at the position of the one-way valve plate; the one-way valve plate is arranged to pass through the gas passage at the position of the one-way valve plate with a first cross-sectional area when the inhalation gas flow flows in the gas passage, and pass through the gas passage at the position of the one-way valve plate with a second cross-sectional area when the exhalation gas flow flows in the gas passage, wherein the second cross-sectional area is smaller than the first cross-sectional area.

59. The noise reducing device of claim 58, wherein, The one-way valve plate is arranged to shield at least 2 / 3 of the area of the ventilation cross section of the gas passage at the position of the one-way valve plate when the exhalation gas flow flows in the gas passage.

60. The noise reducing device of claim 58 or 59, wherein, The air resistance adjusting device further comprises a rotating shaft rotationally connected with the gas passage, and an end portion of the one-way valve plate is provided with a connecting portion fixedly connected with the rotating shaft.

61. The noise reducing device of any one of claims 58-60, wherein, The one-way valve flap is configured to open when the inhalation gas flow flows in the gas passage to increase the cross-sectional area of the gas passage at the position of the one-way valve flap; and to close when the exhalation gas flow flows in the gas passage to decrease the cross-sectional area of the gas passage at the position of the one-way valve flap.

62. The noise reducing device of claim 61, wherein, A limiting member is arranged in the gas passage, and the one-way valve flap is located at one side of the limiting member. When the inhalation gas flow flows in the gas passage, the one-way valve flap is at least partially away from the limiting member to be in an open state. When the exhalation gas flow flows in the gas passage, the one-way valve flap abuts against the limiting member to be in a closed state.

63. A ventilation therapy apparatus, characterized by, The noise reduction device of any one of claims 25-62.

64. A casing structure of a fan, characterized by comprising: The motor cover is configured to cover a motor portion of the fan, and an inner portion of the motor cover is configured with a cavity extending through the motor cover in an axial direction, and the cavity is configured to accommodate the motor portion. An inner wall of the cavity and an outer wall of the motor portion form a cooling inflow passage for gas flow, and the motor cover is further provided with a gas outlet portion, the cooling inflow passage and the gas outlet portion are in fluid communication, and the gas in the cooling inflow passage can flow to the outside of the motor cover through the gas outlet portion.

65. The housing structure for a fan recited in claim 64, wherein, The gas outlet portion includes one or more grooves arranged at an end of the motor cover, the one or more grooves extend along the axial direction of the motor cover and are spaced apart in the circumferential direction of the motor cover, and the gas in the cooling inflow passage can flow to the outside of the motor cover through the one or more grooves.

66. The housing structure of a fan according to claim 64 or 65, wherein The inner wall of the cavity is provided with a support portion configured to contact the outer wall of the motor portion to support the motor portion, and the support portion and the inner wall of the cavity jointly form the cooling inflow passage for gas flow.

67. The housing structure of a fan according to claim 66, wherein The support portion protrudes inwardly in the radial direction of the cavity from the inner wall of the cavity, and the support portion extends along the axial direction of the cavity, wherein the support portion is further provided with a recessed portion recessed inwardly in the radial direction of the cavity.

68. The housing structure of a fan according to claim 66 or 67, wherein The number of the support portions is at least two, and the at least two support portions are spaced apart in the circumferential direction of the cavity.

69. The outer cover structure of any of claims 66-68, wherein, The two ends of the support portion are respectively provided with guide inclined surfaces inclined toward the center of the cavity.

70. The fan cover structure according to any one of claims 66 to 69, wherein The outer wall of the motor cover is further provided with a plurality of annular protrusions.

71. A noise reduction device, comprising: The cover structure of the fan of any one of claims 64-70.

72. A ventilation therapy apparatus, characterized by The noise reduction device of claim 71.

73. An air intake structure of a ventilation therapy apparatus, characterized by, Comprising: a gas passage in which a gas flow flows; and a gas resistance adjusting device arranged in the gas passage, the gas resistance adjusting device is configured such that the gas resistance when a first direction gas flow flows in the gas passage is smaller than the gas resistance when a second direction exhalation gas flow flows in the gas passage, wherein the first direction gas flow and the second direction gas flow are gas flows in opposite directions.

74. An air intake structure for a ventilation treatment apparatus according to claim 73, wherein, The first direction gas flow is an inhalation gas flow inhaled by the patient end from the ventilation treatment device, and the second direction gas flow is an exhalation gas flow exhaled by the patient end.

75. An air intake structure for a ventilation treatment apparatus according to claim 74, wherein, The air resistance adjusting device is configured such that a ventilation cross-sectional area of the air passage when an inhalation air flow flows in the air passage is larger than a ventilation cross-sectional area of the air passage when an exhalation air flow flows in the air passage.

76. An air intake structure for a ventilation treatment apparatus according to claim 74, wherein The air resistance adjusting device comprises a one-way valve plate capable of blocking the ventilation cross-section of the air passage, the one-way valve plate being movably connected in the air passage to change the cross-sectional area of the air passage at the location thereof; the one-way valve plate is configured to pass the inhalation air flow through the air passage at the location of the one-way valve plate at a first cross-sectional area when the inhalation air flow flows in the air passage, and pass the exhalation air flow through the air passage at the location of the one-way valve plate at a second cross-sectional area when the exhalation air flow flows in the air passage, wherein the second cross-sectional area is smaller than the first cross-sectional area.

77. An air inlet structure for a ventilation treatment apparatus according to claim 76, wherein, The one-way valve plate is configured to block at least 2 / 3 of the ventilation cross-section of the air passage at the location thereof when the exhalation air flow flows in the air passage.

78. The air intake structure of a ventilation therapy device of claim 76, wherein, The air resistance adjusting device further comprises a rotating shaft connected in rotation with the air passage, and an end portion of the one-way valve plate is provided with a connecting portion fixedly connected with the rotating shaft.

79. An air inlet structure for a ventilation treatment apparatus according to claim 76, wherein, The one-way valve plate is configured to be opened to increase the cross-sectional area of the air passage at the location thereof when the inhalation air flow flows in the air passage, and closed to decrease the cross-sectional area of the air passage at the location thereof when the exhalation air flow flows in the air passage.

80. An air inlet structure for a ventilation treatment apparatus according to claim 79, wherein, The air passage is provided with a limiting member, the one-way valve plate is located at one side of the limiting member, and the one-way valve plate is at least partially away from the limiting member to be in the opened state when the inhalation air flow flows in the air passage, and the one-way valve plate abuts against the limiting member to be in the closed state when the exhalation air flow flows in the air passage.

81. A ventilation treatment apparatus, characterized by, An air intake structure of a ventilation therapy device according to any one of claims 73-80.

82. The ventilation treatment apparatus of claim 81, wherein, Further comprising a fan assembly and a noise reduction housing, the fan assembly being disposed within the noise reduction housing, the noise reduction housing comprising an air inlet in communication with external air, the fan assembly comprising a fan air inlet, the air passage being disposed within the noise reduction housing between the air inlet and the fan air inlet, external air outside the noise reduction housing being transmitted to the fan air inlet through the air passage.

83. A flow guiding device of a noise reducing device, characterized in that A fluid chamber for fluid flow, the fluid chamber comprising a fluid inlet and a fluid outlet, the fluid chamber being configured such that fluid entering the fluid chamber from the fluid inlet exits the fluid chamber from the fluid outlet after at least one angular turn.

84. The flow diversion device of Claim 83, wherein, The fluid flow direction at the fluid inlet and the fluid flow direction at the fluid outlet have an included angle therebetween greater than 0° and less than 180°.

85. The flow diversion device of either of Claims 83 or 84, wherein, The flow guide device comprises a flow guide body, an interior of the flow guide body being provided with the fluid chamber, the flow guide body comprising a first end and a second end; The flow guide body comprises a flow guide body, an interior of the flow guide body being provided with the fluid chamber, the flow guide body comprising a first end and a second end; The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the first end and the flow direction of the fluid flowing through the second end is 0°, or greater than 0° and less than 180°; The first end is an open end, and the second end is an open end or a closed end; One of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged between the first end and the second end or arranged at the second end.

86. The flow diversion device of claim 85, wherein, The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the open end and the flow direction of the fluid flowing through the closed end is 0°; The first end is the open end, and the second end is the closed end; One of the fluid inlet and the fluid outlet is arranged at the open end, and the other of the fluid inlet and the fluid outlet is arranged on the side wall of the flow guide body between the open end and the closed end.

87. The flow diversion device of Claim 85, wherein, The flow guide body is arranged such that the angle between the flow direction of the fluid flowing through the open end and the flow direction of the fluid flowing through the closed end is greater than 0° and less than 180°; When the second end is the open end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged at the second end; When the second end is the closed end, one of the fluid inlet and the fluid outlet is arranged at the first end, and the other of the fluid inlet and the fluid outlet is arranged on the side wall of the flow guide body between the first end and the second end.

88. The shunt of any of claims 85-87, wherein, The second end of the flow guide body is an integrally formed closed end; or The flow guide body comprises the flow guide tube and a covering element; the covering element comprises a first end and a second end, the first end of the covering element is an open end, the covering element is inserted into or sleeved on the first end of the flow guide tube through the first end of the covering element; the second end of the covering element covers the first end of the flow guide tube; the position of the second end of the covering element is higher than the first end of the flow guide tube, and the second end of the covering element is taken as the second end of the flow guide body; part of the side wall of the covering element overlaps part of the side wall of the flow guide tube; the first end of the flow guide tube is an open end or a closed end, and the second end of the flow guide tube is an open end, and the second end of the flow guide tube is taken as the first end of the flow guide body.

89. The flow guide device according to claim 88, wherein, A first through hole is formed on the side wall of the covering element which does not coincide with the side wall of the flow guide tube, as the fluid inlet or the fluid outlet; or A second through hole is formed on the side wall of the covering element which coincides with the side wall of the flow guide tube, as the fluid inlet or the fluid outlet; or A third through hole and a fourth through hole are respectively formed on the coinciding side walls of the flow guide tube and the covering element, as the fluid inlet or the fluid outlet; or A third through hole and a fourth through hole are respectively formed on the coinciding side walls of the flow guide tube and the covering element, as the fluid inlet or the fluid outlet; or a fifth through hole is formed on the side wall of the cover element which does not coincide with the side wall of the flow guide pipe, and a sixth through hole is formed on the side wall of the cover element which coincides with the flow guide pipe, as the fluid inlet or the fluid outlet; or a seventh through hole is formed on the side wall of the cover element which coincides with the flow guide pipe.

90. The flow diversion device of Claim 89, wherein, The axis of the third through hole and the fourth through hole coincide or do not coincide.

91. The flow diverting device of any of claims 88-90, wherein, The cover element is fixedly connected or detachably connected with the flow guide pipe.

92. The shunt of any of claims 85-91, wherein, The number of the flow guide bodies is one or more, and when the number of the flow guide bodies is more than one, the fluid chambers in each of the flow guide bodies are in communication with each other, the fluid inlet is provided as one or more, and the fluid outlet is provided as one or more.

93. The flow diversion device of claim 92, wherein, The number of the flow guide pipes is more than one, each of the flow guide pipes corresponds to one of the fluid outlets, the aperture of the fluid outlet is 1mm to 5mm, and the radial distance between adjacent fluid outlets is 1mm to 30mm.

94. The shunt of any of claims 83-93, wherein, The cross-sectional area of the fluid inlet is greater than or less than the cross-sectional area of the fluid outlet.

95. A noise reduction device, comprising: The noise reduction device comprises the flow guide device according to any one of claims 83-94, and the noise reduction device further comprises one or more noise reduction chambers, The flow guide structure is arranged in any one of the noise reduction chambers or between two of the noise reduction chambers for communicating the two noise reduction chambers.

96. A ventilation therapy apparatus, characterized by, The noise reduction device comprises the flow guide device according to claim 95.

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