Outer sleeve structure of fan, noise reduction device and ventilation treatment equipment

Abstract

The utility model relates to an outer sleeve structure of a fan, a noise reduction device and ventilation treatment equipment, and relates to the technical field of breathing machines. The outer sleeve structure of the draught fan comprises the flexible motor outer sleeve, the motor outer sleeve is a protective sleeve arranged outside a motor part, and air (the air is provided for a patient to breathe) flows in a cooling inflow channel jointly formed by a supporting part of the motor outer sleeve and the inner wall of a cavity. The air can flow through the outer wall of the motor part, so that heat of the motor part is taken away, the purpose of cooling the motor part is achieved, cooling and cooling of the motor part of the fan can be achieved without additional cooling components, the structure of the outer sleeve and the structure of the noise reduction device applied to the outer sleeve can be simplified, and the noise reduction efficiency is improved. And the maintainability is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to a breathing machine technical field, especially a fan's outer cover structure, noise reduction device and ventilation treatment equipment. BACKGROUND

[0002] Ventilation treatment equipment is a kind of auxiliary breathing treatment device, it can provide breathing gas to patient, by increasing the lung ventilation of patient, can effectively improve the respiratory function of patient, can be applied to the treatment of respiratory failure, respiratory insufficiency, sleep apnea syndrome, chronic obstructive pulmonary disease and other respiratory diseases.

[0003] Ventilation treatment equipment usually adopts fan to provide certain treatment pressure ventilation gas, especially the higher pressure and the greater flow of ventilation gas provided, the higher speed of fan, so that the motor heating of fan is also greater. The motor overheating of fan not only affects the electrical safety of itself, but also causes the power drop of itself. The existing ventilation treatment equipment in solving the problem of motor overheating of fan, the measures generally taken are to set additional cooling components to cool the fan, thereby causing the problems of complex structure, inconvenient maintenance and the like of ventilation treatment equipment. SUMMARY

[0004] The utility model provides a fan's outer cover structure, noise reduction device and ventilation treatment equipment for solving at least one technical problem of above.

[0005] According to the first aspect of the utility model, the utility model provides a fan's outer cover structure, including flexible motor outer cover, the motor outer cover is used to cover the motor part of fan, the inside of motor outer cover is constructed with the cavity along the axial direction through motor outer cover, the cavity can accommodate the motor part;

[0006] The inner wall of cavity and the outer wall of motor part form cooling inflow passage for making gas flow, and the motor outer cover is further provided with gas outlet portion, and 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 motor outer cover through the gas outlet portion.

[0007] In one embodiment, the gas outlet portion includes one or more grooves arranged at the end of the motor outer cover, and the one or more grooves extend along the axial direction of the motor outer cover and are distributed at intervals in the circumferential direction of the motor outer cover, and the gas in the cooling inflow passage can flow to the outside of the motor outer cover through the one or more grooves.

[0008] In one embodiment, the inner wall of the cavity is provided with a support portion for contacting the outer wall of the motor portion to support the motor portion, the support portion and the inner wall of the cavity jointly forming a cooling inlet channel for gas flow.

[0009] In one embodiment, the support portion protrudes inwardly along 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 along the radial direction of the cavity.

[0010] In one embodiment, the number of the support portions is at least two, and the at least two support portions are spaced apart along the circumferential direction of the cavity.

[0011] In one embodiment, the two ends of the support portion are respectively provided with a guide slope inclined towards the center of the cavity.

[0012] In one embodiment, the outer wall of the motor sleeve is further provided with a plurality of annular protrusions.

[0013] In one embodiment, a flexible volute sleeve is further included, the volute sleeve being used to cover the volute portion of the fan, the bottom end of the volute sleeve being provided with an air inlet hole, and the motor sleeve being located on the side of the volute sleeve away from the air inlet hole.

[0014] In one embodiment, the bottom end of the volute sleeve is further provided with a hanging structure and a supporting structure, the hanging structure and the supporting structure extending along the same direction of the axial direction of the volute sleeve from the surface of the volute sleeve, the end of the hanging structure being located below the air inlet hole, and the end of the supporting structure being located above the air inlet hole.

[0015] In one embodiment, the hanging structure includes a lug extending along the axial direction of the volute sleeve, and the two sides of the lug are respectively provided with a fixing portion protruding away from the lug.

[0016] In one embodiment, the fixing portion is provided in the form of a baffle structure extending obliquely from the surface of the lug away from the end of the lug.

[0017] In one embodiment, the lug is configured in the form of an arc structure having the same circumferential profile as the volute sleeve.

[0018] In one embodiment, the end of the lug is provided with a mounting guide portion, and the surface of the mounting guide portion is provided with an anti-skid operation structure.

[0019] In one embodiment, the suspension structure is at least two, and the at least two suspension structures are arranged at intervals along the circumference of the volute shell, and the support structure is located between the suspension structures.

[0020] In one embodiment, the axial end surface of the support structure has one or more sound-attenuating channels configured as grooves or sound-attenuating holes on the support structure.

[0021] In one embodiment, the volute shell and the motor shell are integrated or separate structures.

[0022] According to a second aspect of the present application, the present application provides a noise reduction device comprising the above-mentioned fan shell structure.

[0023] In one embodiment, the noise reduction device further comprises an upper shell, and the upper shell comprises:

[0024] a first gas chamber for fluid communication with a first air inlet device to receive a first gas;

[0025] a second gas chamber for fluid communication with a second air inlet device to receive a second gas, the first gas chamber being in fluid communication with the second gas chamber; and

[0026] a mixing baffle comprising a plurality of baffle pieces extending along the 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 arranged at intervals to form baffle openings between adjacent baffle pieces, the first gas chamber or the second gas chamber being in fluid communication with the mixing chamber through the baffle openings, and the mixing chamber being in fluid communication with the cooling inlet passage.

[0027] In one embodiment, a middle shell is further included, the middle shell being connected to the upper shell, and a middle shell baffle being arranged in the middle shell, an upper chamber and a lower chamber being formed above and below the middle shell baffle respectively, and the fan shell structure being located in the lower chamber.

[0028] In one embodiment, the middle shell baffle is further provided with a mounting hole penetrating through the middle shell baffle, the motor shell being arranged in the mounting hole, a portion of the mounting hole extending into the mixing chamber, and a gap being formed between the mixing chamber and the outer wall of the mounting hole.

[0029] In one embodiment, the middle shell baffle is further provided with an annular baffle, the annular baffle being located in the lower chamber and arranged outside the mounting hole, and the end of the annular baffle extending beyond the end of the mounting hole.

[0030] In one embodiment, the air inlet pipe is further provided with a first hole on the middle shell baffle, and a second hole is provided on the first sidewall of the middle shell, and the axes of the first hole and the second hole are perpendicular to each other.

[0031] The first end of the air inlet pipe extends into the first gas chamber through the first hole, and the second end of the air inlet pipe extends out of the first sidewall of the middle shell through the second hole.

[0032] In one embodiment, the flow guide device further comprises a flange plate and a flow guide pipe provided on the flange plate,

[0033] The flange plate is located between the lower chamber of the middle shell and the lower shell, the flow guide pipe penetrates through the flange plate, one end of the flow guide pipe extends into the lower chamber of the middle shell, and the other end of the flow guide pipe extends into the lower shell.

[0034] In one embodiment, a flow guide cone is arranged at a position opposite to the air inlet of the fan in the lower shell, and at least one resonance cavity is arranged in one or more of the upper shell, the middle shell and the lower shell.

[0035] In addition, the ventilation treatment equipment in the prior art can adopt different treatment modes for patients with different symptoms and needs, such as providing the patient with oxygen therapy gas with a specific concentration, etc. In this mode, if only oxygen and air are separately introduced into the ventilation treatment equipment, since the oxygen is not pre-mixed with the air before entering the fan, it is difficult to obtain mixed gas that is uniformly mixed and has consistent oxygen concentration everywhere.

[0036] According to a third aspect of the present application, the present application provides a noise reduction device for mixing two kinds of gas to obtain uniformly mixed gas with consistent concentration.

[0037] The noise reduction device of the present application comprises a gas mixing chamber and a fan chamber, the gas mixing chamber comprises a first gas inlet and a second gas inlet, the first gas and the second gas can enter the gas mixing chamber through the first gas inlet and the second gas inlet respectively and be pre-mixed in the gas mixing chamber; wherein the gas mixing chamber and the fan chamber are in fluid communication, and the gas pre-mixed in the gas mixing chamber can enter the fan chamber.

[0038] Since the two kinds of gas in the first gas inlet and the second gas inlet can enter the gas mixing chamber for pre-mixing, and the pre-mixed gas enters the fan chamber, the mixed gas from the fan will be more uniform, and the gas concentration everywhere will be more consistent.

[0039] In one embodiment, the gas mixing chamber comprises:

[0040] a first gas chamber having the first gas inlet for being in fluid communication with a first gas inlet device to receive a first gas;

[0041] a second gas chamber having the second gas inlet for being in fluid communication with a second gas inlet device to receive a second gas, the first gas chamber being in fluid communication with the second gas chamber; and

[0042] a mixing baffle comprising a plurality of baffle pieces extending along a depth direction of the first gas chamber or the second gas chamber and a mixing chamber enclosed 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 in fluid communication with the mixing chamber through the baffle openings.

[0043] In one embodiment, the density of the baffle pieces gradually increases along a direction close to the gas inlet of the first gas chamber or the gas inlet of the second gas chamber.

[0044] In one embodiment, the depth of at least one of the baffle openings is less than the depth of other baffle openings.

[0045] In one embodiment, a portion of the plurality of baffle pieces form a side wall of the first gas chamber, and a portion of the plurality of baffle pieces form a side wall of the second gas chamber.

[0046] In one embodiment, the width of the baffle pieces forming the side wall of the first gas chamber is the largest among the plurality of baffle pieces.

[0047] In one embodiment, each of the baffle openings is located between the baffle pieces forming the side wall of the second gas chamber.

[0048] In one embodiment, a first baffle and a second baffle are arranged between the first gas chamber and the second gas chamber, the first baffle and the second baffle respectively forming a side wall of the first gas chamber, and the first baffle and the second baffle respectively forming a side wall of the second gas chamber;

[0049] wherein the height of the second baffle is less than the height of the baffle pieces.

[0050] In one embodiment, the first gas chamber is configured to receive air, and the second gas chamber is configured to receive oxygen, wherein the volume of the second gas chamber is greater than the volume of the first gas chamber.

[0051] In one embodiment, the first gas chamber is capable of accommodating a portion of the first gas inlet device, so that the first gas chamber receives the first gas flowing along the depth direction thereof; and / or

[0052] The side wall of the second gas chamber is provided with a gas inlet port for fluid communication with the second gas inlet device.

[0053] In one embodiment, the gas inlet port is configured to enable the second gas to enter the second gas chamber in a direction perpendicular to the gas inlet direction of the first gas.

[0054] In one embodiment, the outer side of the mixing baffle is provided with a plurality of reinforcing / flow guiding structures spaced along the circumference of the mixing baffle, the reinforcing / flow guiding structures having inclined surfaces inclined towards the first gas chamber or the second gas chamber.

[0055] In one embodiment, the noise reduction device further comprises an upper shell and a middle shell configured with the gas mixing chamber, the middle shell is connected with the upper shell, the inside of the middle shell is provided with a fan outer sleeve structure, the fan outer sleeve structure comprises a fan sleeve for sleeving outside the fan, a cooling inlet flow channel is formed between the fan sleeve and the fan, and the mixing chamber is in fluid communication with the cooling inlet flow channel of the fan outer sleeve structure.

[0056] In one embodiment, the middle shell is provided with a mounting hole, the fan sleeve is arranged in the mounting hole, a portion of the mounting hole extends into the mixing chamber, and a radial gap is formed between the mixing chamber and the outer wall of the mounting hole.

[0057] In one embodiment, an air inlet pipe is further included, the air inlet pipe is configured as an elbow structure, a first end of the air inlet pipe extends into the first gas chamber, and a second end of the air inlet pipe is connected with the side wall of the middle shell.

[0058] In one embodiment, the fan sleeve comprises a volute sleeve and a motor sleeve, the volute sleeve covers the volute portion of the fan, the motor sleeve covers the motor portion of the fan, and a gap is formed between the inner wall of the motor sleeve and the motor portion of the fan, the gap extends along the axial direction of the motor sleeve to form the cooling inlet flow channel.

[0059] In one embodiment, the noise reduction device further comprises a lower shell connected with the middle shell, the lower shell and the upper shell are respectively located on two sides of the middle shell, and the lower shell is in fluid communication with the middle shell through a flow guiding device.

[0060] According to a fourth aspect of the present application, the present application further provides a ventilation therapy device comprising the above-mentioned noise reduction device.

[0061] Compared with the prior art, the motor jacket is a protective jacket arranged outside the motor part, the gas (used for providing breathing for a patient) flows in the cooling inflow channel formed by the support part of the motor jacket and the inner wall of the cavity, so that the gas flows through the outer wall of the motor part, thereby taking away the heat of the motor part, so that the cooling and temperature reduction of the motor part of the fan can be realized without arranging additional cooling components, thereby the structure of the jacket and the structure of the noise reduction device applied thereto can be simplified, and the maintainability is better. BRIEF DESCRIPTION OF DRAWINGS

[0062] Hereinafter, the utility model will be described in more detail based on the embodiments and with reference to the drawings.

[0063] Figure 1 is a three-dimensional structure schematic view of the upper shell of the noise reduction device in the embodiment of the utility model (viewed from above);

[0064] Figure 2 and Figure 3 are respectively three-dimensional structure schematic views of the upper shell of the noise reduction device in the embodiment of the utility model (viewed from below);

[0065] Figure 4 is a three-dimensional structure schematic view of the noise reduction device in the embodiment of the utility model;

[0066] Figure 5 is a three-dimensional structure schematic view of the noise reduction device in the embodiment of the utility model, wherein the upper shell is not shown;

[0067] Figure 6 is a three-dimensional structure schematic view of the noise reduction device in the embodiment of the utility model, wherein the middle shell is not shown;

[0068] Figure 7a and Figure 7b are respectively three-dimensional structure schematic views of the middle shell in the embodiment of the utility model;

[0069] Figure 8 and Figure 9 are respectively sectional views of the noise reduction device in the embodiment of the utility model;

[0070] Figure 10 is a three-dimensional sectional view of the noise reduction device in the embodiment of the utility model;

[0071] Figure 11 is a three-dimensional structure schematic view of the fan structure installed in the noise reduction device in the embodiment of the utility model, wherein the air inlet pipe is shown;

[0072] Figure 12The cross-sectional view of the fan structure in the embodiment of the utility model;

[0073] Figure 13 The three-dimensional structure schematic diagram of the fan structure in the embodiment of the utility model is installed in the noise reduction device, wherein the air inlet pipe is not shown;

[0074] Figure 14 The three-dimensional structure schematic diagram of the fan structure in the embodiment of the utility model is installed in the noise reduction device and observed from below;

[0075] Figure 15 The three-dimensional structure schematic diagram of the lower shell in the embodiment of the utility model;

[0076] Figure 16 The three-dimensional structure schematic diagram of the noise reduction device in the embodiment of the utility model is observed from below, wherein the lower shell is not shown;

[0077] Figure 17 The three-dimensional structure schematic diagram of the noise reduction device in the embodiment of the utility model is observed from below, wherein the lower shell and the flange plate are not shown;

[0078] Figure 18 The three-dimensional structure schematic diagram of the fan structure in the embodiment of the utility model is observed from above;

[0079] Figure 19 The three-dimensional structure schematic diagram of the fan structure in the embodiment of the utility model is observed from below;

[0080] Figure 20 The plan view of the fan structure in the embodiment of the utility model;

[0081] Figure 21 The cross-sectional view of the fan structure in the embodiment of the utility model, wherein the gray part is a cross-sectional line schematic;

[0082] Figure 22 And Figure 23 The three-dimensional structure schematic diagram of the motor sleeve in the embodiment of the utility model respectively;

[0083] Figure 24 The plan view of the motor sleeve in the embodiment of the utility model;

[0084] Figure 25 The Figure 24 Cross-sectional view at A-A;

[0085] Figure 26 And Figure 27 The three-dimensional structure schematic diagram of the volute sleeve in the embodiment of the utility model respectively.

[0086] Reference signs:

[0087] 1, upper shell; 10, shell side wall;

[0088] 110, first gas chamber;

[0089] 120, second gas chamber; 121, gas inlet;

[0090] 130, mixing baffle; 131, baffle piece; 132, mixing chamber; 133, baffle opening;

[0091] 1311, first baffle piece; 1312, second baffle piece; 1331, first baffle opening; 1332, second baffle opening;

[0092] 141, first baffle; 142, second baffle; 143, reinforcing / guiding structure; 144, inclined surface;

[0093] 2, middle shell;

[0094] 210, middle shell baffle; 220, mounting hole; 230, annular baffle; 240, air outlet hole;

[0095] 250, first hole; 260, second hole; 270, upper chamber; 280, lower chamber;

[0096] 3, lower shell; 310, flow guide cone; 320, resonance cavity; 330, flow guide cavity;

[0097] 4, air inlet pipe; 410, first end; 420, second end; 411, notch;

[0098] 5, outer sleeve structure;

[0099] 510, volute outer sleeve; 520, motor outer sleeve; 530, fan; 540, cooling inlet passage;

[0100] 550, muffling passage; 560, suspension structure; 570, support structure;

[0101] 511, air outlet passage; 512, air inlet hole;

[0102] 521, groove; 522, cavity; 523, support portion; 524, recessed portion; 525, protrusion; 526, guide inclined surface;

[0103] 531, volute portion; 532, motor portion; 533, air inlet; 534, air outlet;

[0104] 561, ear; 562, fixed portion; 563, mounting guide portion; 564, anti-slip operation structure;

[0105] 6, sealing structure;

[0106] 7, flow guide device; 71, flow guide pipe; 72, flange. DETAILED DESCRIPTION

[0107] The utility model will be further described below with reference to the drawings.

[0108] According to the first aspect of the utility model, the utility model provides a fan's outer sleeve structure 5, please combine Figures 18-27 And Figures 8-10 , the outer sleeve structure 5 includes the fan sleeve, and the fan sleeve includes flexible motor outer sleeve 520 and flexible volute outer sleeve 510, wherein, the motor outer sleeve 520 is used to cover the motor part 532 of fan 530, and the volute outer sleeve 510 is used to cover the volute part 531 of fan 530.Motor outer sleeve 520 is located above volute outer sleeve 510, and both can be integrated structure or split structure.

[0109] Please combine Figure 8 、 Figure 9 And Figure 10 As shown, volute outer sleeve 510 and motor outer sleeve 520 are flexible material, for example, silicone material, which can not only fix fan 530, so as to play the positioning of fan 530, especially motor outer sleeve 520 can protect the motor part 532 of fan 530, so that the motor part 532 is not damaged under the premise, can also guarantee its location in the designed position.

[0110] Specifically, as Figure 22 、 Figure 23 、 Figure 24 And Figure 25 As shown, please combine Figure 18 、 Figure 20 And Figure 21 , the internal structure of motor outer sleeve 520 has the cavity 522 that penetrates along the axial direction through motor outer sleeve 520, and the cavity 522 can accommodate the motor part 532 of fan 530.

[0111] Therefore, the inner wall of cavity 522 and the outer wall of motor part 532 form a cooling inflow passage 540 for gas flow, and the motor outer sleeve 520 is further provided with a gas outlet portion, and 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.

[0112] Further, as Figure 22 As shown, the inner wall of cavity 522 is provided with a support portion 523, and the support portion 523 is used to contact the outer wall of motor part 532 to support motor part 532.As Figure 24 And Figure 25As shown, the support portions 523 protrude inwardly from the inner wall of the cavity 522 in a radial direction of the cavity 522, and extend in an axial direction of the cavity 522. Thus, 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 may, for example, be at least two, and the at least two support portions 523 are arranged at intervals in a 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 the example, the support portions 523 are arranged at intervals in the circumferential direction of the cavity 522. On one hand, the support portions 523 arranged at intervals can facilitate processing; on the other hand, the support portions 523 can form four uniform cooling inflow passages 540 therebetween, so that the gas can flow uniformly over 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. Figure 24 As shown, the four support portions 523 are arranged at intervals in the circumferential direction of the cavity 522. On one hand, the support portions 523 arranged at intervals can facilitate processing; on the other hand, the support portions 523 can form four uniform cooling inflow passages 540 therebetween, so that the gas can flow uniformly over 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.

[0113] Please refer to Figure 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 in the axial direction of the cavity 522.

[0114] 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. Thus, the gas can take away the heat of the motor portion 532 during the flow, to achieve the purpose of cooling the motor portion 532.

[0115] As Figure 22 As shown in the example, the support portions 523 extend in a linear manner in the axial direction of the cavity 522, and thus the cooling inflow passages 540 defined by the support portions 523 and the inner wall of the cavity 522 are straight channels extending in the axial direction of the cavity 522. Thus, the gas in the cooling inflow passages 540 flows along the outer wall of the motor portion 532 in the axial direction of the cavity 522.

[0116] Conversely, the support portion 523 can also extend spirally along the axial direction of the cavity 522. The cooling inlet channel 540 defined by the support portion 523 and the inner wall of the cavity 522 becomes a spiral flow channel extending spirally along the axial direction of the cavity 522. This allows the gas in the cooling inlet channel 540 to flow spirally across the outer wall of the motor portion 532 along the axial direction of the cavity 522. With this type of cooling inlet channel 540, the outer surface area of ​​the motor portion 532 through which the gas can flow is increased, resulting in a better cooling effect.

[0117] like Figure 24 As shown, and please refer to Figure 18 The gas outlet section includes one or more recesses 521 located at the end of the motor housing 520. (Please refer to...) Figure 23 Each groove 521 is located between two adjacent support portions 523. Multiple grooves 521 extend axially along the motor housing 520 and are spaced apart circumferentially on the motor housing 520. All grooves 521 are in fluid communication with the cooling inlet channel 540. Therefore, the gas in the cooling inlet channel 540 can flow through the grooves 521 to the outside of the motor housing 520. On one hand, during the gas flow, it can carry away some of the heat from the motor portion 532, thus cooling the motor portion 532 of the fan 530. On the other hand, the cooling inlet channel 540 can regulate and guide the gas flow, thus also reducing noise.

[0118] For further information, please continue to refer to [link / reference]. Figure 24 and Figure 25 The support portion 523 is also provided with a recessed portion 524 that is recessed radially inward along the cavity 522. By providing the recessed portion 524, the contact area between the support portion 523 and the motor portion 532 is reduced, and a heat dissipation groove is formed between the support portion 523 and the motor portion 532, thereby further helping to reduce the temperature of the motor portion 532.

[0119] like Figure 22 and Figure 23 As shown, the support portion 523 has guide ramps 526 at both ends, inclined towards the center of the cavity 522. The guide ramps 526 guide the motor portion 53 to smoothly enter the cavity 522. It can be understood that, as... Figure 22 As shown, the guide slope 526 at the upper end of the support 523 slopes downwards; as Figure 23As shown, the guide slope 526 at the lower end of the support part 523 is inclined upward. Among them, the guide slope 526 at the upper end of the support part 523 can play a guiding and directing role for the airflow; the guide slope 526 at the lower end of the support part 523 can play a guiding role for the airflow in addition to being able to play a guiding role for the airflow when the motor part 532 is installed into the cavity 522.

[0120] As shown in Figure 23 and Figure 25 , the outer side of the motor sleeve 520 is also provided with a plurality of annular protrusions 525, please combine Figure 10 , the protrusions 525 are used to be in contact with the inner wall of the mounting hole 220 described below, thereby reducing the contact area between the outer side of the motor sleeve 520 and the inner wall of the mounting hole 220, so that the motor sleeve 520 can be more easily installed into the mounting hole 220.

[0121] As shown in Figure 26 and Figure 27 , please combine Figure 18 and Figure 21 , the volute sleeve 510 is used to cover the volute part 531 of the fan 530, and the bottom end of the volute sleeve 510 is provided with an air inlet hole 512, and the motor sleeve 520 is located on the side of the volute sleeve away from the air inlet hole 512.

[0122] More specifically, as described in Figure 18 , after the volute sleeve 510 is wrapped on the volute part 531 of the fan 530, the bottom end of the motor sleeve 520 can abut against the end face of the volute part 531, so that each groove 521 at the bottom end of the motor sleeve 520 cooperates with the end face of the volute part 531 to define a gas outflow passage, that is, the gas in the cooling inlet passage 540 can flow to the outside of the motor sleeve 520 through the gas outflow passage.

[0123] As shown in Figure 27 , the bottom end of the volute sleeve 510 is also provided with a hanging structure 560 and a support structure 570, please combine Figure 13 , the volute sleeve 510 is used to be installed on the flow guide device 7 described below, specifically, the volute sleeve 510 is fixed on the flange plate 72 of the flow guide device 7, so the hanging structure 560 and the support structure 570 are respectively used to cooperate with the flange plate 72 of the flow guide device 7.

[0124] Specifically, as Figure 27As shown, the suspension structure 560 and the support structure 570 extend in the same axial direction of the volute cover 510 along the surface of the volute cover 510, and both of the suspension structure 560 and the support structure 570 extend in the direction close to the air inlet hole 512, and the extension length of the suspension structure 560 is greater than that of the support structure 570, thus it can be understood that the end of the suspension structure 560 extends beyond the air inlet hole 512, i.e. below the air inlet hole 512, while the end of the support structure 570 is above the air inlet hole 512.

[0125] As shown in Figure 27 , the suspension structure 560 is at least two, and the at least two suspension structures 560 are arranged at intervals along the circumference of the volute cover 510, and the support structure 570 is located between each suspension structure 560. The support structure 570 is essentially a part of the end surface of the volute cover 510, which is used to abut the end surface of the flange plate 72 of the flow guide device 7. Since the volute part 531 of the fan 530 is located at the lower position, and the heavier motor part 532 is located at the upper position, the volute cover 510 and the motor cover 520 covered outside will have a downward movement tendency due to gravity even when fixed, and therefore the main function of the support structure 570 is to abut the surface of the flange plate 72 when the flange plate 72 of the volute cover 510 is fixed, thereby playing a supporting role.

[0126] The suspension structure 560 includes a lug 561 extending in the axial direction of the volute cover 510, and the lug 561 is provided with a fixing part 562 protruding in the direction away from the lug 561 on both sides of the lug 561. Among them, the lug 561 is configured as an arc-shaped structure with the same circumferential profile as the volute cover 510.

[0127] As shown in Figure 27 , the fixing part 562 is provided as a baffle structure extending obliquely from the surface of the lug 561 in the direction away from the end of the lug 561. Alternatively, the fixing part 562 can be a rectangular bar or other structure protruding from the surface of the lug 561 in the direction away from the end of the lug 561, so as to achieve the function of fixing the lug 561.

[0128] The end surface of the fixing part 562 close to the air inlet hole 512 can fix the volute cover 510 from below the flange plate 72 of the flow guide device 7, thereby blocking or preventing the lug 561 from being pulled out upwardly from the gap on the flange plate 72 of the flow guide device 7, thus avoiding the situation that the fan 530 moves upwardly and may be pulled out upwardly from the flange plate 72 of the flow guide device 7.

[0129] As shown in Figure 27 and Figure 19As shown, the end of the lug 561 is provided with a mounting guide 563, and the surface of the mounting guide 563 is provided with an anti-skid operation structure 564. The mounting guide 563 may, for example, be a structure such as a round corner or a chamfer, which can make the lug 561 more smoothly inserted into a hole or a groove matched therewith.

[0130] Further, as shown, Figure 27 the axial end surface of the support structure 570 is provided with one or more sound-attenuating channels 550, which are in communication with the chamber inside the volute casing 510. Please refer to Figure 13 , the support structure 570 abuts against the end surface of the flange plate 72 of the flow guide device 7, and thus the sound-attenuating channels 550 on the support structure 570 can be in communication with the chamber inside the volute casing 510 (the volute portion 531 in which the fan 530 is installed), so that part of the gas (the branch gas flow) outside the volute casing 510 can enter the chamber inside the volute casing 510 via the groove or the sound-attenuating hole (please refer to Figure 13 ), and then enter the air inlet 533 of the fan 530; while the other gas (the main gas flow) outside the volute casing 510 has a different flow path, so that when the sound waves of the main gas flow and the sound waves of the branch gas flow converge after passing through the above two channels, the wavelengths of the two sound waves will differ by 1 / 4 wavelength in phase, so that the two sound waves will be superimposed and interfere with each other, thereby achieving the purpose of noise reduction.

[0131] The sound-attenuating channels 550 are configured as grooves on the support structure 570. For example, the width of the groove is 0.1mm-20mm, preferably 1mm; the height of the groove is 0.1mm-20mm, preferably 5mm; and the length of the groove is 5mm-11mm, preferably 8mm. Among them, the width of the groove is the dimension along the radial direction of the volute casing 510, the height of the groove is the dimension along the axial direction of the volute casing 510, and the length of the groove is the dimension along the circumferential direction of the volute casing 510. The dimensions of the groove are designed so that part of the gas flow can flow through the groove without affecting the air volume of the fan 530.

[0132] In addition, the sound-attenuating channels 550 can also be configured as sound-attenuating holes on the support structure 570.

[0133] As shown, Figure 27 and please refer to Figure 17 and Figure 19 , the bottom of the volute casing 510 is further provided with an air inlet hole 512, and the air inlet 533 of the fan 530 is arranged in the air inlet hole 512 and coaxially arranged with the air inlet hole 512, so that the gas outside the volute casing 510 can enter the fan 530 via the air inlet hole 512 and the air inlet 533 of the fan 530.

[0134] As shown, Figure 27As shown, the volute cover 510 is further provided with an air outlet passage 511, which extends to the outside of the noise reduction device to which the volute cover 510 is applied. The air outlet 534 of the fan 530 is arranged in the air outlet passage 511, so that the gas can be output to the outside of the volute cover 510 and the noise reduction device to which the volute cover 510 is applied via the air outlet passage 511 of the air outlet 534 of the fan 530.

[0135] In summary, the outer cover structure 5 outside the fan 530 has the following functions: first, it can fix the motor part 532 and the volute part 531 of the fan 530, thereby playing a positioning role for the fan 530; second, it can resist 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 position without being damaged; third, it can play a role in reducing vibration and noise and arranging and guiding the airflow, especially forming the airflow with a phase difference at the volute cover 510, thereby achieving the purpose of noise reduction by using the superposition and interference principle of sound waves; fourth, it can play a role in cooling the motor part 532 of the fan 530, especially using the gas flowing in the outer cover structure 5 (the gas is used to provide breathing for the patient) to cool the motor part 532, so that additional devices or components such as cooling and heat dissipation structures are not needed, thereby simplifying the structure of the outer cover structure 5 and the noise reduction device to which the outer cover structure 5 is applied; and the heat of the motor part 532 can be used to preheat the gas flowing in the outer cover structure 5, thereby having the dual functions of cooling and preheating.

[0136] According to a second aspect of the present application, the present application provides a noise reduction device. The noise reduction device comprises the outer cover structure of the fan described above.

[0137] According to a third aspect of the present application, the present application provides a noise reduction device, which comprises a gas mixing chamber and a fan chamber. The gas mixing chamber comprises a first gas inlet and a second gas inlet, and the first gas and the second gas can enter the gas mixing chamber through the first gas inlet and the second gas inlet respectively and be premixed in the gas mixing chamber. The gas mixing chamber is in fluid communication with the fan chamber, and the gas premixed in the gas mixing chamber can enter the fan chamber. The gas mixing chamber can mix two kinds of gases (for example, oxygen and air) and then introduce them into the fan chamber. In this way, the oxygen is premixed with the air before entering the fan chamber, so that the mixed gas discharged from the fan 530 is more uniform, and the gas concentration at each position is more consistent.

[0138] In some optional embodiments, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the noise reduction device includes an upper shell 1 and a middle shell 2 configured with a gas mixing chamber. The gas mixing chamber includes a first gas chamber 110, a second gas chamber 120, a mixing baffle 130, and an upper chamber 270. As shown in Figure 4 and Figure 8 As shown, the upper shell 1 of the noise reduction device is configured with the first gas chamber 110, the second gas chamber 120, and the mixing baffle 130, and the middle shell 2 of the noise reduction device is configured with the upper chamber 270.

[0139] Specifically, the first gas chamber 110 is configured to be in fluid communication with the first gas inlet device to receive the first gas. The second gas chamber 120 is configured to be in fluid communication with the second gas inlet device to receive the second gas. The first gas chamber 110 and the second gas chamber 120 are in flow communication.

[0140] As shown in Figure 1 , Figure 2 and Figure 3 The upper shell 1 can mix the two gases before passing them into the fan, so that the mixed gas coming out of the fan is more uniform, and the gas concentration is more consistent.

[0141] Specifically, as shown in Figure 2 and Figure 3 The upper shell 1 includes the first gas chamber 110, the second gas chamber 120, and the mixing baffle 130. The first gas chamber 110 is configured to be in fluid communication with the first gas inlet device to receive the first gas. The second gas chamber 120 is configured to be in fluid communication with the second gas inlet device to receive the second gas. The first gas chamber 110 and the second gas chamber 120 are in flow communication.

[0142] In the specific application of the upper shell 1, the first gas is air, and the second gas is oxygen, so the following is described by way of example.

[0143] As shown in Figure 2 The mixing baffle 130 includes a plurality of baffle pieces 131 extending along the depth direction of the first gas chamber 110 or the second gas chamber 120 (e.g., the Z-axis direction as shown in Figure 2 The mixing baffle 130 includes a plurality of baffle pieces 131 extending along the depth direction of the first gas chamber 110 or the second gas chamber 120 (e.g., the Z-axis direction as shown in Figure 2 The mixing baffle 130 includes a plurality of baffle pieces 131 extending along the depth direction of the first gas chamber 110 or the second gas chamber 120 (e.g., the Z-axis direction as shown in

[0144] The baffle pieces 131 are spaced apart to form baffle openings 133 between adjacent baffle pieces 131, and the first gas chamber 110 or the second gas chamber 120 can be in fluid communication with the mixing chamber 132 through the baffle openings 133.

[0145] As mentioned above, the first gas chamber 110 receives air, and the second gas chamber 120 receives oxygen, so the first gas chamber 110 can be in fluid communication with the mixing chamber 132 through the baffle opening 133. More specifically, since the first gas chamber 110 and the second gas chamber 120 are in flow 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 baffle opening 133, so as to prolong the flow path of the air into the mixing chamber 132, and as long as possible to make the air and the oxygen have a longer mixing time, so as to improve the uniformity of the mixture of the two.

[0146] As shown in Figure 2 , the upper shell 1 has a shell side wall 10, which forms an internal chamber, which is respectively the first gas chamber 110, the second gas chamber 120 and the mixing chamber 132. The first gas chamber 110 has a first gas inlet (which corresponds to the first end 410 of the air inlet pipe 4 described below, please refer to Figure 6 ), so that the first gas chamber 110 receives the first gas flowing in the depth direction (the Z-axis direction as shown in Figure 2 ) of the first gas chamber 110, that is, the air inlet direction of the first gas chamber 110 is along its depth direction (as shown by the arrow in Figure 2 ). The side wall of the second gas chamber 120 is provided with a second gas inlet, which is configured as an air inlet 121, so that the first gas chamber 110 receives the gas entering from the air inlet 121, and the air inlet 121 can extend along the direction perpendicular to the depth direction (the X-axis direction as shown in Figure 2 ) of the first gas chamber 110, that is, the air inlet direction of the second gas chamber 120 is along its length direction (as shown by the arrow in Figure 2 ). Therefore, it can be seen that the air inlet directions of the first gas chamber 110 and the second gas chamber 120 are perpendicular to each other.

[0147] The second gas (oxygen) enters the upper shell 1 at a relatively fast speed, and after hitting the baffle piece 131 or other inner wall in the upper shell 1, noise will be generated, which is not conducive to noise reduction. For the purpose of noise reduction, the size in the depth direction (the Z-axis direction as shown in Figure 2 ) of the upper shell 1 is set to be small, and the size in the horizontal direction (the X-axis direction as shown in Figure 2 ) is set to be large, so the air inlet 121 is set to extend along the X-axis direction as shown in Figure 2 , which is conducive to buffering the high-pressure and high-speed oxygen flow entering from the air inlet 121.

[0148] As shown in Figure 2As shown, the density of the baffle plates 131 gradually increases in the direction close to the air inlet of the first gas chamber 110 or the air inlet of the second gas chamber 120. That is, the baffle plates 131 are distributed more densely at the position close to the air inlet of the first gas chamber 110 or the air inlet 121, and the width (the size in the circumferential direction of the mixing chamber 132) of the baffle openings 133 formed between adjacent baffle plates 131 is smaller; on the contrary, the baffle plates 131 are distributed more sparsely at the position far away from the air inlet of the first gas chamber 110 or the air inlet 121, and the width (i.e. the size in the circumferential direction of the mixing chamber 132) of the baffle openings 133 formed between adjacent baffle plates 131 is larger. With this design, the two kinds of gas can more easily flow to the position far away from the air inlet of the first gas chamber 110 or close to the air inlet 121, thereby promoting the mixing of the two kinds of gas, so that the two kinds of gas enter the fan 530 in a more uniform mixed gas state. Moreover, the air and oxygen flow around the motor portion 532 of the fan 530 at a uniform flow rate, which can uniformly cool the motor portion 532.

[0149] In addition, the mixing baffle 130 can also function as a screen, which can block the transmission of noise upwardly out of the upper shell 1, thereby also functioning as a noise reduction.

[0150] Further, the depth (i.e. the size in the axial direction of the mixing chamber 132) of at least one of the baffle openings 133 is smaller than that of the other baffle openings 133. As shown, Figure 2 As shown, in the air inlet direction of the second gas chamber 120, the baffle opening 133 farthest away from the air inlet 121 is the first baffle opening 1331, which has the smallest depth; the other baffle openings 133 are second baffle openings 1332, which can have the same depth (or can also have different depths). In addition, each second baffle opening 1332 can have the same width (the size in the circumferential direction of the mixing chamber 132), or have different widths. For example, the width of the second baffle openings 1332 gradually decreases in the direction close to the air inlet of the first gas chamber 110 or close to the air inlet 121, so that the baffle plates 131 are distributed more densely.

[0151] The second gas (oxygen) enters the upper shell 1 at a relatively fast speed, in order to avoid as much as possible the noise generated by the collision between the oxygen and the baffle plates 131, therefore the second baffle openings 1332 close to the air inlet 121 are set deeper to reduce the area of collision between the oxygen and the baffle plates 131; and the depth of the first baffle opening 1331 is set to be smaller, so that the oxygen and air can stay at this position for a relatively long time, thereby promoting the uniform mixing thereof.

[0152] Among the plurality of louvers 131, some of the louvers 131 form the side wall of the first gas chamber 110, some of the louvers 131 form the side wall of the second gas chamber 120, and the louvers 131 forming the side wall of the first gas chamber 110 have the largest width.

[0153] As shown in Figure 2 Among the plurality of louvers 131, one of the louvers 131 is a first louver 1311 which forms the side wall of the first gas chamber 110. In addition, other louvers 131 among the plurality of louvers 131 are second louvers 1312, and the width (the size in the circumferential direction of the mixing chamber 132) of the first louver 1311 is greater than the width of each of the second louvers 1312 which form the side wall of the second gas chamber 120. The first louver 1311 forming the side wall of the first gas chamber 110 can block the flow of air in the first gas chamber 110 to some extent, so that the air can only flow around the first louver 1311 to enter the second gas chamber 120, thereby facilitating uniform mixing with the oxygen.

[0154] In addition, the louver openings 133 on both sides of the first louver 1311 are second louver openings 1332, and the first louver openings 1331 and the second louver openings 1332 are all located outside the first gas chamber 110, that is, each louver opening 133 is located between the louvers 131 forming the side wall of the second gas chamber 120, so that the first gas chamber 110 does not directly communicate with the louver openings 133, but communicates with the louver openings 133 through the second gas chamber 120. Therefore, the air 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 oxygen in the second gas chamber 120 through each louver opening 133, thereby as much as possible to prolong the flow path of the air in the first gas chamber 110, so that the air and the oxygen are more uniformly mixed.

[0155] As shown in Figure 2 and Figure 3 The first gas chamber 110 and the second gas chamber 120 are provided with a first baffle 141 and a second baffle 142, wherein the first baffle 141 and the second baffle 142 form the side wall of the first gas chamber 110 respectively, and the first baffle 141 and the second baffle 142 form the side wall of the second gas chamber 120 respectively.

[0156] Therefore, it can be seen that the side wall of the first gas chamber 110 is the housing side wall 10, the first baffle 141, the first louver 1311, and the second baffle 142 respectively. Among them, the height h1 of the second baffle 142 is greater than the height h2 of the first baffle 141, and the height h2 of the first baffle 141 is greater than the height h3 of the first louver 1311. Figure 2The height hi of the second baffle 142 is less than the height h2 of the housing side wall 10, and the height h2 of the housing side wall 10 is less than the height h3 of the first louvers 1311.

[0157] The first baffle 141 can be configured to have the same height as the height h3 of the first louvers 1311, and the first baffle 141 is used to block the air flow in the first gas chamber 110, so that the air 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 with oxygen.

[0158] Alternatively, the first baffle 141 can be configured to have a recessed structure, so that a part of the first baffle 141 has the same height as the first louvers 1311, and another part of the first baffle 141 has the same height as the housing side wall 10. The part having the same height as the first louvers 1311 can block the air flow in the first gas chamber 110, and the part having the same height as the housing side wall 10 can form an interlocking contact structure with the middle shell 2 described below, facilitating positioning and installation.

[0159] 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, respectively.

[0160] Since the height hi 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, that is, the air in the first gas chamber 110 can pass through the second baffle 142 to enter the second gas chamber 120 to mix with the oxygen in the second gas chamber 120. As shown, Figure 2 The second gas chamber 120 is used to receive oxygen, so its volume is greater than that of the first gas chamber 110 used to receive air, so that more oxygen can be mixed with air.

[0161] The first gas chamber 110 can accommodate a part of the first air inlet device (air inlet pipe 4 described below), that is, a part of the first air 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.

[0162] The side wall of the second gas chamber 120 (i.e. the housing side wall 10) is provided with an air inlet 121 for fluid communication with the second air inlet device, and the oxygen can enter the second gas chamber 120 in a direction perpendicular to the air inlet direction of the air. Therefore, the air inlet directions of oxygen and air are different, that is, the turning of different air flows is increased, thereby playing a good role in reducing noise.

[0163] As shown in Figure 2 and Figure 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 a certain extent to guide the gas into the mixing chamber 132.

[0164] In a preferred embodiment, the noise reduction device comprises the above-mentioned fan outer sleeve structure 5. Please refer to Figure 8 , the inner part of the middle shell 2 is provided with the above-mentioned fan outer sleeve structure 5. As mentioned above, the cooling inlet passage 540 is formed between the motor outer sleeve 520 and the motor part 532 of the fan 530, and the mixing chamber 132 is in fluid communication with the cooling inlet passage 540, so that the mixed gas in the mixing chamber 132 can enter the cooling inlet passage 540 and continue to flow into the fan 530.

[0165] Further, the noise reduction device further comprises an air inlet pipe 4 which is configured as an elbow structure. Please refer to Figure 5 and Figure 2 , the first end 410 of the air inlet pipe 4 extends into the first gas chamber 110, and the second end 420 of the air inlet pipe 4 is connected to the first side wall of the middle shell 2. The air inlet is configured as an elbow structure, which can change the direction of the airflow on the one hand, thereby increasing the difficulty of transmitting noise to the outside of the noise reduction device, so that part of the noise waves are converted into heat, thereby achieving the purpose of noise reduction; on the other hand, the air inlet is configured as an elbow structure, and the elbow structure is made of silica gel material, which can itself absorb part of the noise waves and convert them into vibrations, thereby achieving the purpose of noise reduction.

[0166] Specifically, as shown in Figure 7a , Figure 7b and Figure 8 , the middle shell 2 comprises a middle shell baffle 210 which divides the inner space of the middle shell 2 into an upper chamber 270 and a lower chamber 280, and the outer sleeve structure 5 is located in the inner space of the middle shell 2 away from the lower chamber 280 of the upper shell. The middle shell baffle 210 is provided with a first hole 250, and the first side wall of the middle shell 2 is provided with a second hole 260, and the axes of the first hole 250 and the second hole 260 are perpendicular to each other. Please refer to Figure 5 , Figure 6 and Figure 7bThe first end 410 of the air inlet pipe 4 passes through the first hole 250 and extends into the first gas chamber 110, and the second end 420 of the air inlet pipe 4 passes through the second hole 260 and extends to the outside of the first side wall of the middle shell 2 to be in fluid connection with the air inlet of the ventilation treatment device. When the fan 530 is working, the air pressure in the noise reduction device is reduced, so that external air enters the air inlet pipe 4 through the air inlet of the ventilation treatment device and then enters the noise reduction device.

[0167] Please refer to Figure 6 and Figure 11 , the first end 410 of the air inlet pipe 4 is provided with a notch 411, which is away from the first baffle piece 1311 described above, so that the air flowing from the first end of the air inlet pipe 4 into the first gas chamber 110 can not directly flow into the mixing chamber 132 through the first baffle piece 1311, but can flow into the second gas chamber 120 through the second baffle 142 according to the predetermined flow direction.

[0168] Please refer to Figure 7a , Figure 7b and Figure 8 , the middle shell 2 is provided with a mounting hole 220, and the fan cover described above is arranged in the mounting hole 220. Specifically, the motor cover 520 covering the motor part 532 of the fan 530 is arranged in the mounting hole 220, the mounting hole 220 penetrates the middle shell baffle 210, and a part of the mounting hole 220 extends into the mixing chamber 132, and there is a gap between the inner wall of the mixing chamber 132 and the outer wall of the mounting hole 220, which is a radial gap d1 (as shown in Figure 9 It can be understood that the radial gap d1 is the difference between the inner diameter (radius) of the mixing chamber 132 and the outer diameter (radius) of the mounting hole 220.

[0169] A part of the mounting hole 220 extends into the mixing chamber 132, so that each baffle piece 131 surrounds the outside of the part of the mounting hole 220 located in the mixing chamber 132, so that each baffle piece 131 can play the role of a screen, which can block the transmission of noise to the outside of the upper shell 1, thereby also playing the role of noise reduction.

[0170] Therefore, the mixed gas entering the mixing chamber 132 can enter the cooling inlet passage 540 from the upper end of the motor cover 520 through the radial gap between the inner wall of the mixing chamber 132 and the outer wall of the mounting hole 220, as shown in Figure 8As indicated by the middle arrow, the mixed gas entering the cooling inflow passage 540 flows along the axial direction of the motor jacket 520 downward, and flows from the groove 521 at the bottom end of the motor jacket 520 to the outside of the motor jacket 520, i.e., to the lower chamber 280 of the middle shell 2 in which the motor jacket 520 is located, and finally to the air inlet 533 of the fan 530.

[0171] Therefore, it can be understood that the air and oxygen have been mixed once in the mixing chamber 132 before entering the air inlet 533 of the fan 530, and this mixing process can also be referred to as "premixing"; the air and oxygen after entering the air inlet 533 of the fan 530 are mixed again in the fan, and are output outwardly from the air outlet 534 of the fan 530, so that the patient can be provided with ventilation gas that is more uniform in mixing and more accurate in concentration control.

[0172] Please refer to Figure 7a , Figure 7b and Figure 10 , the middle shell baffle 210 is further provided with an annular baffle 230, the annular baffle 230 is located in the lower chamber 280 and is arranged outside the mounting hole 220, and the end of the annular baffle 230 extends beyond the mounting hole 220. The number of annular baffles 230 can be multiple, and the multiple annular baffles 230 can have different heights, which can play a role in guiding and arranging the airflow.

[0173] In addition, as shown in Figure 4 and Figure 9 , the middle shell 2 is further provided with an air outlet hole 240, the air outlet passage 511 of the volute jacket 510 is arranged in the air outlet hole 240, and the gas output from the air outlet 534 of the fan 530 can be output outwardly through the pipeline connected to the air outlet hole 240. The air outlet hole 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 described above.

[0174] In some preferred embodiments, in addition to the upper shell 1 and the middle shell 2 described above, the noise reduction device can further include a lower shell 3.

[0175] As shown in Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , the noise reduction device further includes a flow guide device 7, as shown in Figure 11 , the flow guide device 7 includes a flange plate 72 and a flow guide pipe 71 arranged on the flange plate 72, wherein the flange plate 72 covers the lower shell 3, and more specifically, the flange plate 72 is located between the lower chamber 280 of the middle shell 2 and the lower shell 3. Therefore, it can be known that the upper end surface of the flange plate 72 can seal the lower chamber 280, and the lower end surface of the flange plate 72 can seal the flow guide cavity 330 inside the lower shell 3.

[0176] As shown in Figure 10 , Figure 14 and Figure 16 , the flange plate 72 is provided with an opening, and the flow guide pipe 71 penetrates the flange plate 72 through the opening, one end of which extends into the lower chamber 280 of the middle shell 2, and the other end extends into the lower shell 3. The flow guide pipe 71 can be a plurality of tubular structures arranged in the form of a fan surface, and each tubular structure can be in communication with each other or not.

[0177] As shown in Figure 10 , the flow guide pipe 71 can communicate the lower chamber 280 of the middle shell 2 and the flow guide cavity 330 of the lower shell 3. As described above, the mixed gas entering the cooling inlet flow channel 540 flows downward along the axis of the motor jacket 520, and flows from the groove 521 at the bottom end of the motor jacket 520 into the lower chamber 280 of the middle shell 2, which can enter the flow guide pipe 71 from above the flow guide pipe 71 under the guidance of the annular baffle 230, and flow from below the flow guide pipe 71 into the flow guide cavity 330 inside the lower shell 3.

[0178] As shown in Figure 9 and 10 , the lower end of the fan 530 has an air inlet 533, which is in fluid communication with the flow guide cavity 330 of the lower shell 3, and the flow guide cavity 330 of the lower shell 3 is provided with a flow guide cone 310 at a position opposite to the air inlet 533, which can guide the airflow in the lower shell 3 to the air inlet 533 and into the fan 530, and finally output by the air outlet 534 of the fan 530.

[0179] Therefore, it can be known that after the jacket structure 5 and the fan 530 are installed on the flange plate 72, the air inlet hole 512 of the volute jacket 510 and the air inlet 533 of the fan 530 corresponding thereto are both exposed in the flow guide cavity 330; while the air outlet passage 511 of the volute jacket 510 and the air outlet 534 of the fan 530 corresponding thereto extend in the lower chamber 280 of the middle shell 2, that is, the air inlet hole 512 and the air outlet passage 511 are separated from each other, and the air inlet 533 of the fan 530 corresponding to the air inlet hole 512 and the air outlet 534 of the fan 530 corresponding to the air outlet passage 511 are also separated from each other. In other words, the flange plate 72 can support the jacket structure 5, and make the air inlet hole 512 and the air outlet passage 511 separated from each other, and the air inlet 533 of the fan 530 corresponding to the air inlet hole 512 and the air outlet 534 of the fan 530 corresponding to the air outlet passage 511 are separated 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 and do not affect each other.

[0180] It should be noted that the flow guide cavity 330 of the lower shell 3 is only in fluid communication with the lower chamber 280 in the middle shell 2 through the flow guide pipe 71, and not through the through hole of the flange 72 for mounting the air inlet hole 512 of the volute outer sleeve 510. Therefore, the air inlet hole 512 of the volute outer sleeve 510 is sealed at the edge of the corresponding through hole, so that the flow guide cavity 330 and the lower chamber 280 are not directly in fluid communication through the through hole. Since the air inlet 533 of the fan 530 is exposed to the flow guide cavity 330, the air inlet 533 of the fan 530 can only absorb the airflow in the flow guide cavity 330, and cannot directly absorb the airflow in the lower chamber 280 where the fan 530 is located. By such a setting mode, the flow transmission path of the airflow in the noise reduction device can be prolonged, so that a better noise reduction purpose can be achieved.

[0181] As shown in Figure 15 , the inside of the lower shell 3 is provided with a flow guide cavity 330, and a flow guide cone 310 is arranged at about the center position of the flow guide cavity 330, which is used to guide the airflow in the flow guide cavity 330 to the air inlet 533. Specifically, the flow guide cone 310 is located below the air inlet 533 and extends towards the air inlet 533, and the flow guide cone 310 is coaxial with the air inlet 533. The flow guide cone 310 is configured as a tapered structure with a diameter that decreases towards the air inlet 533, and the airflow in the flow guide cavity 330 can be guided by the flow guide cone 310 to enter the air inlet 533.

[0182] As described above, the mixed gas entering the mixing chamber 132 flows along the cooling flow passage 540 and enters the lower chamber 280, the gas in the lower chamber 280 can flow along the flow guide pipe 71 and enter the flow guide cavity 330, and the gas in the flow guide cavity 330 enters the 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. the direction perpendicular to the bottom plate of the ventilation therapy device)

[0183] In addition, at least one resonance cavity is also arranged in one or more of the upper shell 1, the middle shell 2 and the lower shell 3. The resonance cavity can be arranged in the chambers described above.

[0184] Hereinafter, the resonance cavity arranged in the lower shell 3 is taken as an example for description.

[0185] Please continue to refer to Figure 15 , the inside of the lower shell 3 is also provided with a resonance cavity 320, which can be located on one side of the flow guide cavity 330, for example. 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.

[0186] Specifically, when a certain frequency of sound waves passes through the resonance cavity 320, resonance of the airflow in the resonance cavity 320 is caused, and the vibration can convert part of the energy of the noise sound waves into heat energy, so as to achieve the purpose of reducing the noise of the whole machine.

[0187] The resonance cavity 320 can be implemented in the following manner.

[0188] Firstly, the noise frequency of the noise reduction device is tested to obtain the frequency (for example, 1500HZ) at which the maximum noise occurs.

[0189] Secondly, the volume V of the resonance cavity 320 is calculated according to the following formulas (1) and (2).

[0190]

[0191] Wherein, V is the volume of the resonance cavity 320; c is the speed of sound, which can be calculated as 340m / s; f is the frequency at which the maximum noise occurs; S c is the diameter of the opening of the resonance cavity 320; l′ c is the length of the opening of the resonance cavity 320.

[0192] The cross-sectional shape of the resonance cavity 320 can be rectangular, cylindrical, etc., as long as its volume meets the above formula.

[0193] As shown in Figure 8 , the flow direction of the gas in the noise reduction device is shown.

[0194] Specifically, first, oxygen enters the second gas chamber 120 through the gas inlet 121, and air enters the first end 410 of the air inlet pipe 4 (please refer to Figure 6 ) through the second end 420 of the air inlet pipe 4, and enters the first gas chamber 110. The air and oxygen are mixed in the second gas chamber 120 and enter the mixing chamber 132.

[0195] The gas in the mixing chamber 132 enters the cooling inlet flow channel 540 from the upper end of the motor jacket 520 and flows along the cooling inlet flow channel 540, thereby cooling the motor part 532; and then enters the lower chamber 280 of the middle shell 2 from each groove 521.

[0196] On the one hand, part of the gas (i.e. the main airflow) in the lower chamber 280 of the middle shell 2 enters the flow guide pipe 71 through the upper end of the flow guide pipe 71 and flows along the flow guide pipe 71 to the flow guide cavity 330 of the lower shell 3, and the gas in the flow guide cavity 330 of the lower shell 3 enters the fan 530 from the air inlet 533 of the fan 530 under the guidance of the flow guide cone 310; on the other hand, please refer to Figure 13The other part of the gas in the lower chamber 280 of the middle shell 2 (i.e. the branch gas flow) can enter the chamber inside the volute cover 510 through one or more sound-eliminating channels 550 on the support structure 570 and flow to the air inlet 533 of the fan 530 in the chamber to enter the fan 530. The flow paths of the main gas flow and the branch gas flow are different, and the lengths are different, so when the sound waves of the main gas flow and the sound waves of the branch gas flow converge after passing through the two flow paths, the wavelengths of the two sound waves will differ by 1 / 4 wavelength phase, so that the two sound waves will be superimposed and interfere with each other to cancel out, thereby achieving the purpose of noise reduction.

[0197] Further, the gas entering the fan 530 from the air inlet 533 of the fan 530 can be output by the air outlet 534 of the fan 530 to the air outlet channel 511 of the volute cover 510, and thus can be output to the outside of the noise reduction device for the patient to breathe.

[0198] As described above in the optional implementation, the noise reduction device only includes the upper shell 1 and the middle shell 2. That is, in this implementation, the lower shell 3 described above can not be provided, or the middle shell 2 and the lower shell 3 described above can be considered as a whole component.

[0199] It can be understood that in this implementation, the flow guide pipe 71 of the flow guide device 7 described above can not be provided, that is, the lower chamber 280 of the middle shell 2 can be directly in fluid communication with the air inlet 533 of the fan 530. Alternatively, in this implementation, the opening on the flange 72 described above for the flow guide pipe 71 to pass through can be retained, or another opening can be provided on the flange 72, and then a part of the gas in the lower chamber 280 of the middle shell 2 (i.e. the main gas flow) can flow directly to the air inlet 533 through the opening to enter the fan 530; another part of the gas in the lower chamber 280 of the middle shell 2 (i.e. the branch gas flow) can enter the chamber inside the volute cover 510 through one or more sound-eliminating channels 550 on the support structure 570 and flow to the air inlet 533 of the fan 530 in the chamber to enter the fan 530. The flow paths of the main gas flow and the branch gas flow are different, and the lengths are different, so when the sound waves of the main gas flow and the sound waves of the branch gas flow converge after passing through the two flow paths, the wavelengths of the two sound waves will differ by 1 / 4 wavelength phase, so that the two sound waves will be superimposed and interfere with each other to cancel out, thereby achieving the purpose of noise reduction.

[0200] Further optionally, in this embodiment, the flow guide device 7 as a whole, i.e. the lower chamber 280 of the middle shell 2, can be in fluid communication with the air inlet 533 of the fan 530 directly. And the motor casing 520 and / or the flexible volute casing 510 can be connected to the inner wall of the middle shell 2 by means of suspension / hanging. Therefore, it can be known that the gas in the lower chamber 280 of the middle shell 2 can flow directly to the air inlet 533 and enter the fan 530.

[0201] According to a fourth aspect of the present application, the present application provides a ventilation therapy device, which comprises a high-flow humidification oxygen therapy instrument or a breathing machine. The ventilation therapy device comprises the above-mentioned noise reduction device, and an air inlet (not shown) of the ventilation therapy device, and the noise reduction device is in fluid connection with the air inlet of the ventilation therapy device. Specifically, the second end 420 of the air inlet tube 4 is in fluid connection with the air inlet of the ventilation therapy device. Since the fan 530 is working, the air pressure in the noise reduction device will be reduced, so that the external air will enter the second end 420 of the air inlet tube 4 through the air inlet of the ventilation therapy device, then enter the gas mixing chamber of the noise reduction device, and finally enter the fan 530. The fan 530 can pressurize the mixed gas, and the pressurized gas can be provided for the patient to breathe.

[0202] In addition, the ventilation therapy device can further comprise other components for realizing its necessary functions, which can all adopt various implementation manners in the prior art, and the present application will not repeat them here.

[0203] It should be noted that the arrows in each drawing attached to the present application represent the flow direction of the gas.

[0204] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent substitutions can be made to the components thereof. In particular, each of the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A casing structure of a fan, characterized by comprising: The motor cover is flexible and covers the motor part of the fan, and a cavity is formed in the motor cover along the axial direction of the motor cover and can accommodate the motor part. An inner wall of the cavity and an outer wall of the motor part form a cooling inlet channel for gas flow, and a gas outlet is arranged on the motor cover, the cooling inlet channel is in fluid communication with the gas outlet, and the gas in the cooling inlet channel can flow to the outside of the motor cover through the gas outlet.

2. The casing structure of a fan according to claim 1, wherein The gas outlet comprises one or more grooves arranged on the 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 inlet channel can flow to the outside of the motor cover through the one or more grooves.

3. The casing structure of a fan according to claim 1 or 2, characterized in that, A support part is arranged on the inner wall of the cavity, and the support part is used to contact the outer wall of the motor part to support the motor part.

4. The casing structure of a fan according to claim 3, wherein The support part protrudes inwardly along the radial direction of the cavity from the inner wall of the cavity, and the support part extends along the axial direction of the cavity.

5. The casing structure of a fan according to claim 3, wherein The support part is provided with a recessed part recessed inwardly along the radial direction of the cavity.

6. The casing structure of a fan according to claim 3, wherein The number of support parts is at least two, and the at least two support parts are spaced apart in the circumferential direction of the cavity.

7. The casing structure of a fan according to claim 3, wherein Two ends of the support part are respectively provided with guide inclined surfaces inclined towards the center of the cavity.

8. The casing structure of a fan according to claim 1 or 2, wherein An outer wall of the motor cover is further provided with a plurality of annular protrusions.

9. The casing structure of a fan according to claim 8, wherein The volute cover is flexible and covers the volute part of the fan, and the bottom end of the volute cover is provided with an air inlet hole.

10. The casing structure of a fan according to claim 9, wherein The bottom end of the volute cover is further provided with a suspension structure and a support structure, the suspension structure and the support structure extend in the same direction along the axial direction of the volute cover, the suspension structure extends to the end thereof below the air inlet hole, and the end of the support structure is above the air inlet hole.

11. The casing structure of a fan according to claim 10, wherein The suspension structure comprises a lug extending along the axial direction of the volute cover, and two sides of the lug are respectively provided with a fixing part protruding away from the lug.

12. The casing structure of a fan according to claim 10, wherein The fixing part is arranged as a baffle structure inclinedly extending away from the end of the lug.

13. The casing structure of a fan according to claim 12, wherein The lug is arranged as an arc structure with the same circumferential profile as the volute cover.

14. The casing structure of a blower according to claim 9, wherein The end of the lug is provided with a mounting guide part, and the surface of the mounting guide part is provided with an anti-skid operation structure.

15. The housing structure of a fan according to claim 9, wherein The number of suspension structures is at least two, and the at least two suspension structures are spaced apart in the circumferential direction of the volute cover, and the support structure is located between the suspension structures.

16. The housing structure of a fan according to claim 8, wherein The axial end surface of the support structure has one or more sound reduction channels arranged as grooves or sound reduction holes on the support structure. The volute cover and the motor cover are integrated or separate structures.

17. A noise reduction device, characterized by The fan housing structure comprises the fan according to any one of claims 1-16.

18. The noise reducing device of claim 17, wherein, The noise reduction device further comprises an upper shell, wherein the upper shell comprises: a first gas chamber for being in fluid communication with the first air inlet device to receive a first gas; a second gas chamber for being in fluid communication with the second air inlet device to receive a 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 along 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 in fluid communication with the mixing chamber through the baffle openings, the mixing chamber being in fluid communication with the cooling inlet channel.

19. The noise reducing device of claim 18, wherein, The noise reduction device further comprises a middle shell connected to the upper shell, wherein the middle shell is provided with a middle shell baffle, and an upper chamber and a lower chamber are formed above and below the middle shell baffle respectively, and the fan housing structure is located in the lower chamber. The middle shell baffle is further provided with a mounting hole penetrating through the middle shell baffle, and the motor housing is arranged in the mounting hole, a part of the mounting hole extends into the mixing chamber, and a gap is formed between the mixing chamber and the outer wall of the mounting hole.

20. The noise reducing device of claim 19, wherein, The middle shell baffle is further provided with an annular baffle, the annular baffle is located in the lower chamber and is arranged outside the mounting hole, and the end of the annular baffle extends beyond the end of the mounting hole.

21. The noise reducing device of claim 19, wherein, The noise reduction device further comprises an air inlet pipe, the middle shell baffle is provided with a first hole, and the first side wall of the middle shell is provided with a second hole, the axes of the first hole and the second hole are perpendicular to each other. The first end of the air inlet pipe extends into the first gas chamber through the first hole, and the second end of the air inlet pipe extends out of the first side wall of the middle shell through the second hole.

22. The noise reducing device of claim 19, wherein, The noise reduction device further comprises a flow guide device and a lower shell, the flow guide device comprises a flange and a flow guide pipe arranged on the flange, The flange is located between the lower chamber of the middle shell and the lower shell, the flow guide pipe penetrates through the flange, one end of the flow guide pipe extends into the lower chamber of the middle shell, and the other end of the flow guide pipe extends into the lower shell.

23. The noise reducing device of claim 22, wherein, The lower shell is provided with a flow guide cone at a position opposite to the air inlet of the fan, and one or more of the upper shell, the middle shell, and the lower shell are further provided with at least one resonance cavity.

24. A ventilation therapy apparatus, characterized by The noise reduction device comprises the fan according to any one of claims 17-23. The noise reduction device comprises the fan according to any one of claims 17-23.

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