Noise reduction structure and noise reduction device of fan and ventilation treatment equipment

Abstract

The utility model relates to a noise reduction structure and a noise reduction device of a fan and ventilation treatment equipment, and relates to the technical field of breathing machines. The noise reduction structure of the draught fan comprises a flexible first draught fan sleeve. Due to the fact that the flexible first draught fan sleeve can at least cover a part of the draught fan, vibration generated by the draught fan in operation can be effectively buffered, sound isolation is carried out, and the noise reduction effect is achieved; in addition, a supporting part, a fixing part and a limiting part on the first fan sleeve can effectively limit the first fan sleeve when the first fan sleeve is fixedly installed, so that a fan installed in the first fan sleeve can be stably fixed when vibration is generated in the operation process, and furthermore, due to the fact that a hanging structure where the limiting part is located is also arranged to be a flexible structure, the fan can be stably installed on the first fan sleeve. And vibration generated during operation of the fan can be effectively buffered, so that the stability of fixed installation of the fan is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ventilators, and in particular to a noise reduction structure and a noise reduction device of a fan, and ventilation therapy equipment. Background Art

[0002] As an assisted respiratory therapy device with artificial ventilation function, ventilation therapy equipment supplies breathing gas to the patient through the breathing tube and the patient interface, effectively improving the patient's respiratory function by increasing the patient's lung ventilation volume. It is now widely used in the treatment of respiratory diseases such as respiratory failure, respiratory insufficiency, sleep apnea syndrome, chronic obstructive pulmonary disease, etc., and can play an important role in assisting patients' breathing, saving and prolonging patients' lives.

[0003] Ventilation therapy equipment generally uses a fan to provide ventilation gas at a certain therapeutic pressure. However, due to the high noise generated by the fan during operation, noise reduction treatment is required. Existing noise reduction methods mainly use sound-absorbing and noise-reducing cotton around the fan. However, the quality of the sound-absorbing and noise-reducing cotton can be difficult to guarantee. In particular, after ventilation therapy equipment has been used for a period of time, the sound-absorbing and noise-reducing cotton may age, making it difficult to ensure that the fluid flowing through the sound-absorbing and noise-reducing cotton is not contaminated. As a result, contaminated fluid may be delivered to the patient end, causing safety issues. Utility Model Content

[0004] The present application provides a noise reduction structure, a noise reduction device and a ventilation treatment device for a fan, which are used to solve at least one of the above-mentioned technical problems.

[0005] The present application provides a noise reduction structure for a fan, comprising a flexible first fan cover, the first fan cover being used to cover at least a portion of the fan, the fan comprising an air inlet, one end of the first fan cover having a fan cover air inlet, the fan cover air inlet corresponding to the air inlet of the fan, the fan cover air inlet being coaxial with the air inlet of the fan;

[0006] In which, a flexible suspension structure is provided on the surface of the first fan cover close to the air inlet of the fan cover, and the suspension structure extends from the surface of the first fan cover along the axial direction of the first fan cover; the suspension structure includes a limiting portion, and the limiting portion is configured to limit the movement of the first fan cover within a preset range when the first fan cover is fixedly installed.

[0007] In one embodiment, a flexible support structure is provided on the surface of the first fan sleeve close to the air inlet of the fan sleeve, and the support structure extends from the surface of the first fan sleeve along the axial direction of the first fan sleeve; the support structure is constructed so that when the first fan sleeve is fixedly installed, the free end of the support structure contacts the installation surface of the first fan sleeve.

[0008] In one embodiment, the number of the suspension structures is at least two, and at least two of the suspension structures are arranged at intervals along the circumference of the first fan sleeve. The support structure is constructed to be located between the suspension structures along the circumference of the first fan sleeve, and the length of the suspension structure extending axially from the surface of the first fan sleeve is greater than the axial extension length of the support structure.

[0009] In one embodiment, the suspension structure includes a lifting ear extending along the axial direction of the first fan sleeve, and the limiting portions are located on both sides of the lifting ear and protrude from the surface of the lifting ear.

[0010] In one embodiment, the limiting portion is configured as a blocking piece structure that extends obliquely from the surface of the lifting ear in a direction away from the free end of the lifting ear.

[0011] In one embodiment, the lifting ear is an arc-shaped structure having the same circumferential profile as that of the first fan sleeve.

[0012] In one embodiment, the free end of the lifting ear is provided with a mounting guide portion, and the surface of the mounting guide portion is provided with an anti-slip operation structure.

[0013] In one embodiment, the axial end surface of the support structure has one or more silencer channels, and the silencer channels are configured so that when the first fan sleeve is fixedly installed, air flows through the silencer channels and passes through both sides of the support structure.

[0014] In one embodiment, the fan includes a motor, an impeller and a casing, the motor is connected to the impeller to drive the impeller to rotate, the casing at least surrounds the outside of the impeller, and the first fan cover at least covers the surface of the casing corresponding to the impeller.

[0015] In one embodiment, a flexible buffer structure is provided on the side of the first fan cover away from the air inlet of the fan cover, and the buffer structure extends from the surface of the first fan cover along the axial direction of the first fan cover, and the extension direction of the buffer structure is opposite to the extension direction of the suspension structure; the buffer structure is constructed so that when the first fan cover is covered and installed on the fan, the top of the free end of the buffer structure is higher than the top of the motor of the fan.

[0016] In one embodiment, the buffer structure includes at least two buffer structures, and the at least two buffer structures are arranged at intervals along the circumference of the first fan sleeve and surround the motor of the fan; and / or

[0017] The buffer structure and the first fan cover are split structures or integrally formed structures.

[0018] In one embodiment, a flexible second fan cover is further included, which is located on the side of the first fan cover away from the air inlet of the fan cover. The second fan cover is used to cover the motor of the fan, and the second fan cover and the first fan cover are a split structure or an integral molded structure.

[0019] In one embodiment, a third flexible fan cover is further included, the fan includes an air outlet, and the third fan cover is used to cover the air outlet of the fan; and / or

[0020] The first fan cover and the third fan cover are of a split structure or an integrally formed structure.

[0021] According to a second aspect of the present application, the present application provides a noise reduction device, comprising the above-mentioned noise reduction structure of the fan, characterized in that it further comprises:

[0022] a lower shell, wherein an air inlet is provided in the lower shell;

[0023] an upper shell, the upper shell and the lower shell being engaged with each other, and an air outlet being provided in the upper shell; and

[0024] A middle shell, the middle shell comprising a sealing baffle disposed on a side close to the upper shell and a fastening member disposed on a side close to the lower shell;

[0025] A first chamber is formed between the fastening member and the lower shell, a second chamber is formed between the sealing baffle and the upper shell, and a third chamber is formed between the sealing baffle and the fastening member;

[0026] The noise reduction structure of the fan is fixedly mounted on the sealing baffle via the suspension structure, and a ventilation opening is provided on the sealing baffle at a position corresponding to the air inlet of the fan housing, so that the air inlet of the fan installed in the first fan housing is exposed to the third chamber through the ventilation opening;

[0027] The first chamber is in fluid communication with the second chamber, and the second chamber is in fluid communication with the third chamber;

[0028] The fluid entering the noise reduction device through the air inlet can flow in the first chamber, the second chamber, and the third chamber in sequence, and then flow to the air inlet of the fan.

[0029] In one embodiment, an air outlet cavity is further formed between the upper shell and the sealing baffle, and the air outlet is arranged in an area of the upper shell corresponding to the air outlet cavity. The air outlet cavity is fluidically isolated from the second chamber, and the sealing baffle allows the air outlet of the fan to extend into the air outlet cavity when the fan is installed in the noise reduction device through the noise reduction structure of the fan, and the air inlet side of the fan is fluidically separated from the air outlet side of the fan.

[0030] In one embodiment, the fastener is made of a flexible material.

[0031] In one embodiment, a guide cone is provided on the fastening member, the guide cone is located below the air inlet of the fan sleeve and extends in a direction toward the air inlet of the fan sleeve, and the guide cone is coaxial with the air inlet of the fan sleeve.

[0032] In one embodiment, a hanging groove corresponding to the hanging structure is provided on the sealing baffle, the hanging structure passes through the hanging groove, and the limiting portion is located below the hanging groove.

[0033] In one embodiment, the hanging groove is configured as a flared groove, and the width of the flared groove on a side facing the first fan sleeve is greater than the width of the flared groove on a side away from the first fan sleeve.

[0034] In one embodiment, a first flow guide device is provided on the middle shell and passes through the middle shell, and two ends of the first flow guide device extend into the first chamber and the second chamber respectively, and the second chamber is fluidically connected to the first chamber through the first flow guide device.

[0035] In one embodiment, a second flow guiding device is provided on the sealing baffle, and two ends of the second flow guiding device extend into the second chamber and the third chamber respectively. The third chamber is fluidically connected to the second chamber through the second flow guiding device.

[0036] In one embodiment, the first flow guiding device comprises at least one first flow guiding pipe, and the first flow guiding pipe extends along the axial direction of the first fan sleeve; and / or

[0037] The end of the first flow guide pipe corresponding to the inflow of fluid is provided with a flow guide inclined surface.

[0038] In one embodiment, the second flow guiding device includes at least one second flow guiding pipe, the second flow guiding pipe extends along the axial direction of the first fan sleeve, and an end of the second flow guiding pipe corresponding to the inflow of the fluid is provided with a flow guiding inclined surface.

[0039] In one embodiment, the first chamber includes a first flow channel, which extends inside the lower shell and connects the air inlet end of the first flow channel to the air inlet fluid of the lower shell. The air outlet end of the first flow channel is located at the position of the first flow guide device corresponding to the fluid inlet end.

[0040] In one embodiment, there are multiple first flow channels, the air inlet ends of the multiple first flow channels are arranged side by side, and the air outlet ends of the multiple first flow channels diverge outward along the radial direction of the first fan sleeve.

[0041] In one embodiment, at least one of the first chamber, the second chamber, and the third chamber is provided with at least one resonance cavity, and the resonance cavity is configured to enable the airflow in the resonance cavity to resonate with external sound waves of a specific frequency.

[0042] According to a third aspect of the present application, the present application provides a ventilation therapy device, comprising the above-mentioned noise reduction device and a water tank, wherein the noise reduction device is fluidically connected to the water tank.

[0043] Compared with the prior art, the advantage of the present application is that, since the flexible first fan cover can at least cover a part of the fan, it can effectively buffer the vibration generated by the running fan and isolate the sound to achieve the effect of noise reduction; in addition, the upper limit portion of the first fan cover can effectively limit the first fan cover when it is fixedly installed, so that the fan installed in the first fan cover can also be firmly fixed when it vibrates during operation, and since the suspension structure where the limiting portion is located is also set to a flexible structure, it can further effectively buffer the vibration generated by the operation of the fan, thereby improving the stability of the fixed installation of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Hereinafter, the present application will be described in more detail based on embodiments with reference to the accompanying drawings.

[0045] Figure 1a is a three-dimensional diagram of a noise reduction structure in one embodiment of the present application;

[0046] Figure 1b is a perspective view of a noise reduction structure in another embodiment of the present application;

[0047] Figure 2a 1 is a schematic diagram of the structure of the first fan cover covering the fan in the embodiment of the present application, which shows the motor part of the fan;

[0048] Figure 2b This is a schematic diagram of the structure of the first fan cover covering the fan in the embodiment of the present application, wherein the motor part of the fan is hidden;

[0049] Figure 3a This is a schematic structural diagram of the embodiment of the present application in which the first fan cover is wrapped around the fan and observed from below;

[0050] Figure 3b This is a schematic structural diagram of an embodiment of the present application in which a first fan cover is wrapped around a fan and viewed from the front;

[0051] Figure 4 is a three-dimensional view of the first fan housing observed from above in an embodiment of the present application;

[0052] Figure 5 is a three-dimensional view of the first fan housing observed from below in an embodiment of the present application;

[0053] Figure 6 yes Figure 5 Enlarged view at point A;

[0054] Figure 7 Schematic diagram of the structure of the muffler channel on the first fan housing in the embodiment of the present application;

[0055] Figure 8 is a schematic diagram of the three-dimensional structure of the noise reduction device in an embodiment of the present application;

[0056] Figure 9 is an axial cross-sectional view of the noise reduction device in an embodiment of the present application, wherein the impeller of the fan and the housing covering the impeller are not shown;

[0057] Figure 10 and Figure 11a They are three-dimensional cross-sectional views of the noise reduction device in the embodiment of the present application, wherein the impeller of the fan and the housing covering the impeller are not shown;

[0058] Figure 11b is a three-dimensional cross-sectional view of the noise reduction device in an embodiment of the present application from another angle, wherein the impeller of the fan and the housing covering the impeller are not shown, and the gray portion in the figure represents the cross-sectional hatching;

[0059] Figure 12 is a schematic diagram of the three-dimensional structure of the noise reduction device in an embodiment of the present application, wherein the upper shell is not shown;

[0060] Figure 13 is a schematic diagram of the three-dimensional structure of the noise reduction device in an embodiment of the present application, wherein the upper shell and the noise reduction structure are not shown;

[0061] Figure 14a is a schematic diagram of the three-dimensional structure of the lower shell of the noise reduction device in an embodiment of the present application;

[0062] Figure 14b is a schematic diagram of the three-dimensional structure of the lower shell of the noise reduction device in an embodiment of the present application, wherein the fastening member is not shown;

[0063] Figure 14c 1 is a schematic diagram of the three-dimensional structure of the noise reduction device after the lower shell and the fastening member are installed in the embodiment of the present application, and the gray part in the figure represents the cross-sectional hatching;

[0064] Figure 15 is a front view of the noise reduction device in an embodiment of the present application;

[0065] Figure 16a yes Figure 15 Cross-sectional view at BB;

[0066] Figure 16b yes Figure 15 Cross-sectional view at CC;

[0067] Figure 17 Schematic diagram of the coordination between the limiting portion and the suspension groove of the noise reduction structure in an embodiment of the present application;

[0068] Figure 18 is a cross-sectional view of the lower shell of the noise reduction device in an embodiment of the present application;

[0069] Figure 19 is a cross-sectional view of the lower shell of the noise reduction device in an embodiment of the present application, wherein the fastening member is not shown;

[0070] Figure 20 is a schematic diagram of the three-dimensional structure of the fastening member of the noise reduction device in an embodiment of the present application observed from above;

[0071] Figure 21 is a schematic diagram of the three-dimensional structure of the fastening member of the noise reduction device in an embodiment of the present application observed from below;

[0072] Figure 22 is a bottom view of a fastening member of a noise reduction device in an embodiment of the present application;

[0073] Figure 23a is a schematic diagram of the three-dimensional structure of the flange of the noise reduction device in an embodiment of the present application as viewed from above;

[0074] Figure 23b is a schematic diagram of the three-dimensional structure of the sealing structure of the noise reduction device in an embodiment of the present application observed from below;

[0075] Figure 23c is a schematic diagram of the three-dimensional structure of the sealing structure of the noise reduction device in an embodiment of the present application observed from above;

[0076] Figure 24 is a three-dimensional cross-sectional view of a flange of a noise reduction device in an embodiment of the present application;

[0077] Figure 25 is a schematic diagram of the three-dimensional structure of the upper shell of the noise reduction device in the embodiment of the present application observed from below;

[0078] Figure 26 is a schematic diagram of the three-dimensional structure of the upper shell of the noise reduction device in an embodiment of the present application observed from below, wherein the sealing baffle is not shown;

[0079] Figure 27 This is a schematic diagram of the three-dimensional structure of the upper shell of the noise reduction device in the embodiment of the present application observed from below, in which the sealing baffle and the noise reduction structure are not shown.

[0080] Reference numerals:

[0081] 1. Upper shell; 11. Air outlet; 12. Second chamber; 13. Air outlet;

[0082] 2. Lower shell; 21. Air inlet; 22. First chamber; 221. First flow channel;

[0083] 3. Middle shell;

[0084] 23. Fastener; 231. Third chamber; 232. Resonance chamber; 233. Guide cone; 234. Inlet flow channel; 235. Connecting groove; 236. Resonance chamber inlet;

[0085] 30. Sealing baffle; 31. Flange; 311. Hanging groove; 312. Trapezoidal groove; 313. Guide vane; 314. Trapezoidal boss; 315. Mounting groove; 316. First center hole;

[0086] 32. Sealing structure; 321. Suspension mating surface; 322. Engaging boss; 323. Second center hole;

[0087] 33. First flow guide pipe; 331. Diversion inclined surface;

[0088] 34. Second flow guide pipe;

[0089] 35. Air outlet baffle; 36. Ventilation opening;

[0090] 4. Noise reduction structure;

[0091] 41. First fan housing; 411. Fan housing air inlet; 412. Fan housing air outlet; 413. Third fan housing;

[0092] 42. Suspension structure; 421. Lifting lug; 422. Position limiting portion; 423. Guide portion; 424. Matching end surface; 425. Anti-slip operation structure;

[0093] 43. Support structure; 44. Groove; 45. Buffer structure; 46. Second fan cover;

[0094] 5. Fan; 51. Motor; 52. Housing; 53. Fan air inlet; 54. Fan air outlet;

[0095] 6. Flow monitoring device. DETAILED DESCRIPTION

[0096] The present application will be further described below with reference to the accompanying drawings.

[0097] According to the first aspect of this application, Figure 1a-Figure 7 As shown, the present application provides a noise reduction structure 4 for a fan, including a flexible first fan cover 41. The first fan cover 41 covers at least a portion of a fan 5. The fan 5 includes a motor 51, an impeller, and a casing (or volute). The motor 51 is connected to the impeller to drive the impeller to rotate. The casing 52 surrounds at least the outside of the impeller. The first fan cover 41 covers at least the surface of the casing 52 corresponding to the impeller.

[0098] Figure 2a and Figure 2b As shown, the first fan cover 41 may cover a portion of the outer shell 52 of the fan 5 or completely cover the outer shell 52 of the fan 5 .

[0099] The fan 5 also has an air inlet 53 (such as Figure 3a and Figure 3b As shown), Figure 4 and Figure 5 As shown, the first fan cover 41 has a fan cover air inlet 411, wherein the fan cover air inlet 411 corresponds to the fan air inlet 53 and the axes of the two are collinear. More specifically, as Figure 5 As shown, the fan cover air inlet 411 is located at one end of the first fan cover 41 (for example, it can be the bottom end when in a normal working installation position), and is connected to the space inside the first fan cover 41 for accommodating the fan 5.

[0100] like Figure 4 As shown, the circumferential side portion of the fan 5, i.e., the tangential direction of the circumference, has an air outlet 54 of the fan. The noise reduction structure 4 also includes a third fan cover 413, which is used to cover the air outlet 54 of the fan. Since the outer side of the air outlet 54 of the fan is covered with the third fan cover 413, which has vibration buffering and connection sealing functions, the end of the third fan cover 413 has an opening, which can form a fan cover air outlet 412. The fan cover air outlet 412 covers and surrounds the outer side of the fan outlet 54, and the fan cover air outlet 412 is collinear with the axis of the fan outlet 54.

[0101] The third fan cover 413 can also be a flexible fan cover, and can be a separate structure from the first fan cover 41 or a one-piece structure connected to the first fan cover 41. The third fan cover 413 and the interior of the first fan cover 41 form a space communicating structure for accommodating the fan 5, that is, the first fan cover 41 and the third fan cover 413 respectively accommodate a part of the fan 5. Figure 4 It is shown that the air outlet 54 of the fan is located in the third fan cover 413. It is understandable that the air outlet 54 of the fan and the air outlet 412 of the fan cover can also adopt other corresponding installation forms. The flexible first fan cover 41 is wrapped around the outside of the fan 5, and the fan 5 can be positioned; in addition, the first fan cover 41 can also fix the fan 5, thereby playing a role in reducing vibration and noise when the fan 5 is working. Moreover, when the first fan cover 41 is wrapped around the outside of the fan 5, when there is an external force or when it falls accidentally, the first fan cover 41 can also play a role in resisting impact and preventing collision for the fan 5, thereby protecting the fan 5, and the limiting part 422 on the first fan cover 41 can also maintain the designed position without damaging the fan 5.

[0102] like Figure 1a and Figure 1b As shown, the noise reduction structure 4 of the fan may also include Figure 1a The flexible second fan sleeve 46 or Figure 1b The buffer structure 45 is shown.

[0103] like Figure 1a As shown, the second fan cover 46 is located on a side of the first fan cover 41 away from the fan cover air inlet 411. The second fan cover 46 is used to cover the motor 51 of the fan 5. The second fan cover 46 covers the outside of the motor 51, thereby playing a role in reducing vibration and noise when the fan 5 is working. Moreover, the second fan cover 46 covers the outside of the fan 5, and when there is an external force or an accidental fall, the second fan cover 46 can also play a role in resisting impact and collision for the fan 5, thereby protecting the fan 5 and allowing it to remain in the designed position without being damaged.

[0104] like Figure 4 As shown, a suspension structure 42 is provided on one side of the first fan cover 41 close to the fan cover air inlet 411 (i.e., when the fan 5 is in the normal working position, the fan's air inlet 53 is located at the bottom end of the fan 5 as a whole, and therefore the fan cover air inlet 411 surrounding the fan's air inlet 53 is also located at the bottom end side of the first fan cover 41). The suspension structure 42 extends from the surface of the first fan cover 41 along the axial direction of the first fan cover 41; the suspension structure 42 includes a limiting portion 422, which limits the movement of the first fan cover 41 within a preset range when the first fan cover 41 is fixedly installed. In this embodiment, the suspension structure 42 is constructed as an integrally formed structure with the first fan cover 41; in other embodiments, the suspension structure 42 can be configured as a structure detachably connected to the first fan cover 41.

[0105] like Figure 4As shown, a flexible support structure 43 is provided on the surface of the first fan cover 41 on the side close to the fan cover air inlet 411, and the support structure 43 extends from the surface of the first fan cover 41 along the axial direction of the first fan cover 41; when the first fan cover 41 is fixedly installed, the free end of the support structure 43 contacts the installation surface of the first fan cover.

[0106] In this embodiment, the support structure 43 is a buffer flange or buffer edge structure raised from the surface of the first fan cover 41; in other embodiments, the support structure 43 itself can be a part of the end surface on the surface of the first fan cover 41. In this embodiment, the suspension structure 42 and the support structure 43 are formed by the surface of the first fan cover 41 along the same direction of the axial direction of the first fan cover 41 (such as Figure 4 The suspension structure 42 is extended (as shown by the mid-dotted line), and the extension length of the suspension structure 42 is greater than the extension length of the support structure 43, so the end of the suspension structure 42 extends beyond the fan cover air inlet 411 and is located below the fan cover air inlet 411, while the end of the support structure 43 is located above the fan cover air inlet 411.

[0107] The support structure 43 is used to abut against the suspension mating surface 321 described below. Since the housing 52 of the fan 5 is located at a lower position of the fan 5 as a whole during normal installation and use, and the heavier motor 51 is located at an upper position of the fan 5 as a whole, the fan 5 covered with the first fan cover 41 will tend to move downward due to gravity when fixedly installed. Therefore, the support structure 43 located above the fan cover air inlet 411 will abut against the surface of the suspension mating surface 321 fixed to the first fan cover 41 due to the gravity of the fan 5, thereby providing a buffering support for the fan 5. Compared with other embodiments, a circle of end faces located in the lower half of the first fan cover 41 is directly brought into contact with the suspension mating surface 321. In this embodiment, a circle of support structure 43 with an edge structure protruding from the surface of the first fan cover 41 and extending axially thereof is provided in the lower half of the first fan cover 41. When the first fan cover 41 is supported and connected with the suspension mating surface 321, the support structure 43 protruding from the surface of the first fan cover 41 is brought into contact with the suspension mating surface 321. Since the support structure 43 is made of flexible material, the first fan cover 41 is indirectly in contact with the suspension mating surface 321 through the flexible support structure 43, which cushions and reduces the vibration generated by the fan 5 installed in the first fan cover 41 during operation, and avoids the vibration generated by the fan operation from being transmitted outward to the suspension mating surface 321, thereby achieving the effect of further reducing the noise generated by the fan 5 during operation, and the noise reduction effect is further improved.

[0108] The number of the suspension structures 42 is at least two, and at least two suspension structures 42 are arranged at intervals along the circumference of the first fan cover 41. The support structure 43 is constructed to be located between the suspension structures 42 along the circumference of the first fan cover 41, and the length of the suspension structure 42 extending axially from the surface of the first fan cover 41 is greater than the axial extension length of the support structure 43.

[0109] Specifically, the suspension structure 42 includes a limiting portion 422 . When the first fan cover 41 is fixed, the support structure 43 and the limiting portion 422 cooperate to fix the first fan cover 41 from opposite sides of the first fan cover 41 .

[0110] like Figure 5 and Figure 6 As shown, the suspension structure 42 further includes a lug 421 extending axially along the first fan housing 41. The lug 421 is configured as an arc-shaped structure having the same circumferential profile as the first fan housing 41. That is, the arc-shaped lug is an arc-shaped sheet structure that bends in a direction away from the fan housing air inlet 411.

[0111] like Figure 6 As shown, the limiting portions 422 are located on both sides of the lifting ear 421 (more specifically, on both sides in the extending direction of the lifting ear 421 ) and protrude from the surface of the lifting ear 421 .

[0112] In some embodiments, the stopper 422 is configured as a blocking structure extending obliquely from the surface of the ear 421 in a direction away from the free end of the ear 421. In other embodiments, the stopper 422 is configured as a rectangular strip or other structure protruding from the surface of the ear 421.

[0113] When installing, please combine Figure 17 , the ear 421 is inserted from top to bottom into the hole or slot (such as the hanging slot 311 described below) that matches it. Since there is a gap between the limiting portion 422 and the surface of the ear 421, the gap can facilitate the deformation of the limiting portion 422, so that the limiting portion 422 and the ear 421 pass through the hole or slot together, so that the limiting portion 422 is located below the hole or slot. Figure 6As shown, the end surface of the limiting portion 422 close to the air inlet 411 of the fan sleeve is the matching end surface 424. Therefore, after the limiting portion 422 passes through the hole or slot, the matching end surface 424 of the limiting portion 422 is located below the sealing baffle 30 where the hole or slot is located. In addition, the horizontal spacing between the pair of limiting portions 422 (baffle structures) located on both sides of the ear 421 gradually decreases as the vertical distance from the sealing baffle 30 increases, that is, the closer the limiting portions 422 are to the sealing baffle 30, the larger the horizontal spacing between them is, that is, the baffle structure presents a vertical spacing along the direction toward the sealing baffle. The trumpet-shaped structure gradually opens in the direction of the plate 30. The purpose of this design is that when the fan 5 and the first fan cover 41 move upward, the mating end surface 424 of the limiting portion 422 formed by the trumpet-shaped baffle structure contacts the surface of the sealing baffle 30, and under the action of the upward traction force, it further deforms, so that the horizontal distance between the pair of limiting portions 422 is further expanded, thereby blocking or preventing the ear 421 from escaping upward from the gap of the hole or groove, thereby avoiding the situation where the fan 5 may escape upward when moving upward.

[0114] like Figure 6 As shown, the free end of the ear 421 (arc-shaped ear) (i.e., the end away from the air inlet 411 of the fan sleeve) is provided with a mounting guide portion 423. The guide portion 423 can be, for example, a rounded corner, a chamfered corner or the like, which can make it easier for the ear 421 to be inserted into the hole or slot that matches it. In addition, the surface of the mounting guide portion 423 is also provided with an anti-slip operating structure 425, which can protrude outward from the surface of the ear 421, or the anti-slip operating structure 425 can be, for example, an anti-slip protrusion or an anti-slip rib or the like. In addition, the size of the portion of the ear 421 located below the limiting portion 422 is gradually reduced to facilitate its easy insertion into the hole or slot that matches it.

[0115] The number of the suspension structures 42 is at least two, and at least two suspension structures 42 are spaced apart along the circumference of the first fan casing 41. Figure 5 As shown, an embodiment is shown in which three suspension structures 42 are arranged at equal intervals along the circumference of the first fan cover 41.

[0116] The support structure 43 is located between at least two suspension structures 42. The support structure 43 is essentially a bottom wall structure on the first fan cover 41 located between the two suspension structures 42. When the lugs 421 are inserted into the corresponding holes or slots, the support structure 43 abuts against the plane where the holes or slots are located (such as the suspension mating surface 321 described below) from above. Therefore, the first fan cover 41 is supported above the plane where the first fan cover 41 is installed (such as the suspension mating surface 321 described below) by the support structure 43.

[0117] Since the support structure 43 and the limiting portion 422 cooperate to fix the first fan cover 41 and the fan 5 therein from opposite sides of the first fan cover 41 , the first fan cover 41 and the fan 5 therein can be fixed at a designed position.

[0118] It can be understood that the "upper side", "lower side" and "bottom end" mentioned in this article are all relative to the orientation of the fan 5 when it is working. They are only for the purpose of facilitating understanding and are not intended to limit this application.

[0119] The axial end surface of the support structure 43 has a muffler channel, which can reduce noise. The muffler channel is configured so that when the first fan cover 41 is fixedly installed, air flows through the muffler channel and passes through both sides of the support structure 43.

[0120] Specifically, the muffler channel is defined by the groove 44 on the support structure 43 and a surface (such as the sealing baffle 30 described below) that abuts the support structure 43. Alternatively, the muffler channel can be configured as a muffler hole on the support structure 43.

[0121] like Figure 7 As shown, a groove 44 is provided on the axial end face of the support structure 43, and the groove 44 extends along the axial direction of the first fan sleeve 41. By providing the groove 44 on the support structure 43, a gap is formed between the axial end face of the support structure 43 and the plane matching it (such as the suspension matching surface 321 described below).

[0122] Furthermore, the groove 44 is constructed such that its width is 0.1 mm to 20 mm, preferably 1 mm; its height is 0.1 mm to 20 mm, preferably 5 mm; and its length is preferably 8 mm. The width of the groove 44 is the dimension along the radial direction of the first fan housing 41; the height of the groove 44 is the dimension along the axial direction of the first fan housing 41; and the length of the groove 44 is the dimension along the circumferential direction of the first fan housing 41. The dimensions of the groove 44 are designed to allow a portion of the airflow to flow through the groove 44 without affecting the airflow of the fan 5.

[0123] Likewise, the groove 44 may also be constructed as a hole or the like provided on the axial side wall of the support structure.

[0124] The noise reduction principle of the silencer channel is as follows. The main airflow flows outside the first fan cover 41 and flows to the fan cover air inlet 411 at the bottom thereof, thereby entering the fan air inlet 53 and entering the fan 5 through the fan air inlet 53; since the support structure 43 of the first fan cover 41 has one or more silencer channels, a portion of the branch airflow will pass through these silencer channels and directly enter the fan 5 through the fan air inlet 53; since the path lengths of the channel for the main airflow and the channel for the branch airflow are different, when the sound waves of the main airflow and the sound waves of the branch airflow pass through the above two channels and merge, the wavelengths of the two sound waves will differ by a phase of 1 / 4 wavelength, which will cause the two sound waves to superimpose and interfere with each other to cancel each other out, thereby achieving the purpose of noise reduction.

[0125] The number of the muffler channels may be one or more. For example, one or more grooves 44 may be provided on the support structure 43 between every two suspension structures 42 ; or one or more grooves 44 may be provided on the support structure 43 between any two suspension structures 42 .

[0126] The first fan cover 41 is a silicone cover, which has certain flexibility and has certain advantages in reducing vibration and noise. The suspension structure 42 thereon is also made of silicone material, which can be deformed and thus facilitates installation.

[0127] The second fan cover 46 and the first fan cover 41 are of a split structure or an integrally formed structure. When the second fan cover 46 and the first fan cover 41 are of a split structure, the second fan cover 46 can be fixedly connected to the first fan cover 41, or the second fan cover 46 can be fixedly connected to the motor 51 of the fan 5.

[0128] The second fan cover 46 may also be a silicone cover. In particular, when the second fan cover 46 and the first fan cover 41 are an integrally formed structure, it is more convenient to install the fan 5 if the second fan cover 46 is a silicone cover.

[0129] like Figure 1b As shown, a flexible buffer structure 45 is provided on a side of the first fan cover 41 away from the fan cover air inlet 411. The buffer structure 45 extends from the surface of the first fan cover 41 along the axial direction of the first fan cover 41, and the extension direction of the buffer structure 45 is opposite to the extension direction of the suspension structure 42. When the first fan cover 41 is mounted on the fan 5, the top of the free end of the buffer structure 45 is higher than the top of the fan motor 51.

[0130] The buffer structure 45 can be at least two support columns, which are arranged at intervals along the circumference of the first fan cover 41 and surround the motor 51 of the fan 5. At least two support columns extend from the side of the first fan cover 41 away from the fan cover air inlet 411 along the axial direction of the first fan cover 41, and at least two support columns extend to exceed the end of the motor 51 of the fan 5. The support columns do not need to contact the fan 5, but only surround the fan 5 in the circumferential direction and are higher than the end of the fan 5 in the axial direction. Therefore, when the support columns surround the motor 51 of the fan 5, when there is an external force or when it accidentally falls, the support columns can also resist impact and collision for the motor 51 of the fan 5, thereby protecting the fan 5 so that it can remain in the designed position without being damaged, or reduce impact damage when it is impacted or falls when it is not installed.

[0131] The support columns and the first fan cover 41 are detachable split structures or integrally formed structures.

[0132] According to the second aspect of this application, Figure 8-Figure 27 As shown, please refer to Figure 1a-Figure 7 The present application also provides a noise reduction device, including the above-mentioned noise reduction structure 4 of the fan, such as Figure 8 As shown, it also includes a lower shell 2, an upper shell 1 and a middle shell 3.

[0133] like Figure 8 、 Figure 14b 、 Figure 15 and Figure 16a As shown, an air inlet 21 is provided in the lower shell 2. Figure 14b As shown, the air inlet 21 is located on the side wall of the lower shell 2, and the interior of the lower shell 2 forms a concave chamber (please refer to Figure 11b ), air can enter the chamber through the air inlet 21.

[0134] like Figure 8 、 Figure 16a and Figure 27 As shown, the upper shell 1 is located above the lower shell 2, and an air outlet 11 is provided in the upper shell 1. Figure 8 As shown, the air outlet 11 is located on the top wall of the upper shell 1 , and a recessed chamber is formed inside the upper shell 1 , in which the air can flow out of the noise reduction device through the air outlet 11 .

[0135] like Figure 2a and Figure 20-25As shown, the middle shell includes a sealing baffle 30 disposed near the side of the upper shell 1 and a fastening member 23 disposed near the side of the lower shell 2. The fastening member 23 and the recessed chamber of the lower shell 2 form a sealed first chamber 22, the sealing baffle 30 and the recessed chamber of the upper shell 1 form a sealed second chamber 12, and the sealing baffle 30 and the fastening member 23 form a sealed third chamber 231. The first chamber 22 is in fluid communication with the second chamber 12, and the second chamber 12 is in fluid communication with the third chamber 231.

[0136] A ventilation opening 36 (such as Figure 11b As shown), the fluid entering the noise reduction device from the air inlet 21 circulates in the first chamber 22, the second chamber 12 and the third chamber 231 in sequence, and flows through the ventilation opening 36 to the air inlet 53 of the fan installed in the first fan sleeve 41.

[0137] The noise reduction structure of the fan is connected to the sealing baffle 30 through the above-mentioned suspension structure 42. The sealing baffle 30 is as shown in FIG. Figure 9 As shown, the fan 5 is located in the second chamber 12 formed by the sealing baffle 30 and the upper shell 1, and is connected to the sealing baffle 30 through the suspension structure 42 on the noise reduction structure 4 of the fan. The sealing baffle 30 can support the noise reduction structure 4 of the fan and make the air inlet 53 of the fan installed in the first fan cover 41 exposed to the third chamber 231 formed by the sealing baffle 30 and the fastening member 23 through the ventilation opening 36, as shown in FIG. Figure 11b As shown, the fan sleeve air inlet 411 and the fan air inlet 53 are both facing the third chamber 231 so as to be fluidically connected to the third chamber 231, so that the airflow in the third chamber 231 enters the fan 5 through the fan air inlet 53, and the fan 5 pressurizes the inhaled airflow and outputs it through the fan outlet 54.

[0138] More specifically, if Figure 9 As shown, the third chamber 231 is opened through the ventilation opening 36 on the sealing baffle 30 (see Figure 11b and Figure 20 ) is in fluid communication with the fan housing air inlet 411 and the fan air inlet 53. When the fan noise reduction structure is connected to the sealing baffle 30 through the above-mentioned suspension structure 42, the fan housing air inlet 411 is coaxial with the ventilation opening 36. Figure 9 The arrows in the figure show the flow of air in each chamber. Air enters the first chamber 22 through the air inlet 21 on the lower housing 2, flows from the first chamber 22 to the second chamber 12, and then flows from the second chamber 12 to the third chamber 231. From the third chamber 231, air enters the fan housing air inlet 411 through the ventilation opening 36 and then enters the fan air inlet 53. The air at the fan outlet 54 is discharged through the air outlet 11.

[0139] During use, the noise reduction device is installed within a ventilation therapy device. Each chamber of the noise reduction device is arranged perpendicularly to the chassis of the ventilation therapy device. The first chamber 22 serves as the air inlet chamber, and the second chamber 12 houses the fan 5. The fan's air inlet 53 is either located between the second chamber 12 and the third chamber 231, vertically aligned with the sealing baffle 30, or extends into the third chamber 231. In short, the fan's air inlet 53 is in fluid communication only with the third chamber 231. The airflow between each chamber is perpendicular to the chassis of the ventilation therapy device, and the motor shaft of the fan 5 is also perpendicular to the chassis of the ventilation therapy device. For example, in this embodiment, the first chamber 22 is located at the bottommost chamber of the noise reduction device, the second chamber 12 is located at the topmost chamber of the device, and the third chamber 231 is located in the middle of the device, between the first chamber 22 and the second chamber 12. Since the three chambers are arranged vertically relative to the horizontal plane of the chassis of the ventilation therapy device, and the axial direction of the fan 5 is also perpendicular to the horizontal plane of the chassis of the ventilation therapy device, the flow direction of the airflow between the chambers is also perpendicular to the horizontal plane of the chassis of the ventilation therapy device.

[0140] like Figure 20 、 Figure 21 、 Figure 22 、 Figure 23a and Figure 24 As shown, the sealing baffle 30 includes a flange 31 and a sealing structure 32 that cooperates with the flange 31. The edge of the sealing structure 32 can extend between the upper shell 1 and the lower shell 2, thereby sealing the upper shell 1 and the lower shell 2. The flange 31 and the sealing structure 32 can be an integrated structure or a separate structure. If the flange 31 and the sealing structure 32 are a separate structure, the two can be connected by interlocking.

[0141] The flange 31 and the sealing structure 32 are connected by means of staggered concave and convex structures. Figure 23a and Figure 24 As shown, the edge of the upper surface of the flange 31 is staggeredly provided with trapezoidal grooves 312 and trapezoidal bosses 314. Figure 23b As shown, trapezoidal grooves 312 and trapezoidal bosses 314 are also alternately provided at the edge of the lower surface of the sealing structure 32. When the sealing structure 32 is placed on the flange 31, the trapezoidal grooves 312 on the sealing structure 32 cooperate with the trapezoidal bosses 314 on the flange 31, and the trapezoidal bosses 314 on the sealing structure 32 cooperate with the trapezoidal grooves 312 on the flange 31, thereby fixing the two to each other.

[0142] It is understandable that the trapezoidal groove 312 and the trapezoidal boss 314 may also be other structural forms, such as a dovetail groove and a dovetail boss, etc., as long as they are structures that can form a mortise and tenon joint connection between the flange 31 and the sealing structure 32.

[0143] Furthermore, if Figure 23a and Figure 23b As shown, please combine Figure 11b The ventilation opening 36 includes a first central hole 316 located on the flange 31 and a second central hole 323 located on the sealing structure 32. The first central hole 316 and the second central hole 323 have the same aperture and are coaxial, and their axes are coaxial with the fan cover air inlet 411 of the first fan cover 41. The flange 31 is provided with a plurality of mounting grooves 315 along the circumference of the first central hole 316, such as Figure 23b As shown, a plurality of engaging bosses 322 are provided on the sealing structure 32 along the circumference of the second center hole 323. The engaging bosses 322 correspond one-to-one to the mounting grooves 315 and the engaging bosses 322 engage with the mounting grooves 315 from below, thereby ensuring a stable connection between the flange 31 and the sealing structure 32.

[0144] In addition, the engaging boss 322 is located on the lower surface of the sealing structure 32, that is, the side of the sealing structure 32 away from the first fan cover 41. Figure 20 As shown, the hanging mating surface 321 is located on the upper side of the sealing structure 32 at a position corresponding to the engaging boss 322. The hanging mating surface 321 is used to cooperate with the support structure 43 of the first fan cover 41. In other embodiments, especially when the flange 31 and the sealing structure 32 are an integrated structure, the hanging mating surface 321 is a circle of the upper surface of the sealing baffle 30 that abuts against the support structure 43 or the surface of the first fan cover 41. Specifically, a circle of the surface of the support structure 43 of the first fan cover 41 or the lower half of the first fan cover is in contact with the hanging mating surface 321.

[0145] The flange 31 is provided with a hanging groove 311 corresponding to the hanging structure 42. The hanging structure 42 passes through the hanging groove 311 so that the limiting portion 422 is located below the hanging groove 311. Figure 17 and Figure 18 As shown, the ear 421 is inserted into the hanging groove 311 from top to bottom. Since there is a gap between the limiting portion 422 and the ear 421, the gap can facilitate the limiting portion 422 to deform and move toward the surface of the ear 421, so that the limiting portion 422 and the ear 421 pass through the hanging groove 311 together, so that the limiting portion 422 is located below the hanging groove 311. Figure 6As shown, the end face of the limiting portion 422 close to the air inlet 411 of the fan sleeve is a matching end face 424. Therefore, after the limiting portion 422 passes through the hanging groove 311, it is located below the hanging groove 311, and can fix the first fan sleeve 41 from below the hanging groove 311, thereby blocking or preventing the ear 421 from escaping upward from the gap on the hanging groove 311, thereby avoiding the situation where the fan 5 moves upward and may escape upward.

[0146] Please continue to refer to Figure 17 , and please combine Figure 12 The hanging slot 311 is configured as a flared slot, with the width of the end of the flared slot facing the first fan housing 41 being greater than the width of the end away from the first fan housing 41. In other words, the width of the hanging slot 311 is greater at the upper end and smaller at the lower end. Therefore, when the stopper 422 and the lifting lug 421 pass through the hanging slot 311 together, the stopper 422 can prevent the lifting lug 421 from falling out of the hanging slot 311.

[0147] An air outlet cavity is formed between the upper shell 1 and the sealing baffle 30, and the air outlet 11 is provided in the upper shell 1 in an area corresponding to the air outlet cavity. The air outlet cavity is fluidically isolated from the second chamber 12. When the fan 5 is installed in the noise reduction device through the fan noise reduction structure 4, the fan's air outlet 54 extends into the air outlet cavity, so that the fan's air inlet side is fluidically isolated from the fan's air outlet side. Figure 20 As shown, the flange 31 of the sealing baffle 30 is also provided with an air outlet baffle 35, and the air outlet baffle 35 and the upper shell 1 are enclosed to form an air outlet cavity. Figure 12 As shown, the third fan cover 413 extends to the area where the air outlet baffle 35 is located, so that the fan cover air outlet 412 is located in the air outlet cavity, please refer to Figure 25 、 Figure 26 and Figure 27 The air outlet baffle 35 extends along the axial direction of the first fan housing 41. The air outlet baffle 35 can be, for example, an arc-shaped baffle formed on the flange 31. The air flow in the fan 5 can flow from the fan housing air outlet 412 to pass through the air outlet baffle 35. The air outlet baffle 35 can organize and guide the air flow so that the air flow can flow to the outside of the noise reduction device through the air outlet 11.

[0148] Therefore, it can be seen that after the first fan cover 41 and the fan 5 are installed on the sealing baffle 30, the fan cover air inlet 411 and the corresponding fan air inlet 53 are exposed to the third chamber 231; while the fan cover air outlet 412 and the corresponding fan air outlet 54 are exposed to the air outlet cavity, that is, the fan cover air inlet 411 and the fan cover air outlet 412 are separated from each other, and the fan air inlet 53 and the fan air outlet 54 are also separated from each other. In other words, the sealing baffle 30 can support the noise reduction structure of the fan, and separate the fan cover air inlet 411 and the fan cover air outlet 412 from each other, and the fan air inlet 53 corresponding to the fan cover air inlet 411 and the fan air outlet 54 corresponding to the fan cover air outlet 412 are separated from each other. As a result, the air inlet side (low-pressure side) and the air outlet side (high-pressure side) of the fan 5 are separated from each other and do not affect each other.

[0149] As described above, since the first chamber 22 is located below the second chamber 12 and the third chamber 231 is located between the first chamber 22 and the second chamber 12 , the first and second flow guiding devices are required to connect the corresponding chamber fluids.

[0150] Specifically, if Figure 9 、 Figure 10 、 Figure 11a and Figure 11b As shown, a first flow guide device is provided on the middle shell, which passes through the middle shell. The two ends of the first flow guide device extend into the first chamber 22 and the second chamber 12 respectively. The second chamber 12 is in fluid communication with the first chamber 22 through the first flow guide device. It should be noted that in order to better show the first fan cover 41, Figure 9 、 Figure 10 、 Figure 11a and Figure 11b The impeller of the fan 5 and the casing covering the impeller are not shown.

[0151] like Figure 9 As shown, please combine Figure 12 and Figure 13 The first flow guide device includes at least one first flow guide pipe 33. The number of the first flow guide pipes 33 can be set as needed. Figure 12 As shown, an example of multiple first air guide tubes 33 is shown, and the multiple first air guide tubes 33 are arranged side by side. Each first air guide tube 33 extends along the axial direction of the first fan cover 41 and passes through the flange 31 and the fastener 23, and the center of the multiple first air guide tubes 33 is located on a virtual circle concentric with the outline of the first fan cover 41. That is to say, the multiple first air guide tubes 33 are distributed in a fan shape on one side of the first fan cover 41.

[0152] like Figure 9 、 Figure 10 and Figure 24As shown, both ends of the first flow conduit 33 extend into the first chamber 22 and the second chamber 12 respectively and are in fluid communication with the first chamber 22 and the second chamber 12 respectively. Therefore, the air in the first chamber 22 can flow upward into the second chamber 12 via the first flow conduit 33.

[0153] It is understandable that the first flow guide tubes 33 may not be connected to each other, or a communication groove may be provided on the side wall of each first flow guide tube 33 so that the fluid between the first flow guide tubes 33 is connected.

[0154] A second flow guide device is provided on the sealing baffle 30 , and two ends of the second flow guide device extend into the second chamber 12 and the third chamber 231 respectively. The third chamber 231 is fluidically connected to the second chamber 12 through the second flow guide device.

[0155] like Figure 9 As shown, please combine Figure 12 、 Figure 13 and Figure 24 The second flow guiding device includes at least one second flow guiding pipe 34, and the number of the second flow guiding pipes 34 can be set as needed. Figure 12 As shown, an example of a second flow guide tube 34 is shown. Figure 12 and Figure 13 The second flow guide pipe 34 can be formed by multiple connected pipes, each of which extends along the axial direction of the first fan sleeve 41 and passes through the flange 31. Therefore, the second flow guide pipe 34 is also distributed in a fan shape on the other side of the first fan sleeve 41 compared to the first flow guide device.

[0156] It is understandable that the second flow guiding device may also adopt a structural form of multiple first flow guiding tubes 33 .

[0157] like Figure 9 As shown, the second guide tube 34 is different from the first guide tube 33 in that the second guide tube 34 extends along the axial direction of the first fan sleeve 41 and only passes through the flange 31 but not through the fastening member 23 (as shown in FIG. Figure 11b That is, both ends of the second air guide tube 34 extend into the second chamber 12 and the third chamber 231, respectively, and are in fluid communication with the second chamber 12 and the third chamber 231, respectively. Therefore, air in the second chamber 12 can flow downward into the third chamber 231 via the second air guide tube 34.

[0158] like Figure 9 、 Figure 24 and Figure 25As shown, the end of the first flow guide tube 33 located in the first chamber 22, corresponding to the end where the fluid flows in, is provided with a flow-guiding inclined surface 331 to facilitate smooth flow of air from the first chamber 22 into the first flow guide tube 33. It is conceivable that the end of the second flow guide tube 34 located in the second chamber 12, corresponding to the end where the fluid flows in, is also provided with a flow-guiding inclined surface. It should be noted that the second chamber 12 and the third chamber 231 are fluidically connected only through the second flow-guiding device, and not through the ventilation opening 36 provided on the sealing baffle 30. Therefore, the fan housing air inlet 411 of the first fan housing 41 is sealed to the opening edge corresponding to the ventilation opening 36, preventing direct fluid communication between the second chamber 12 and the third chamber 231 through the ventilation opening 36. Since the fan's air inlet 53 is exposed to the third chamber 231, it can only absorb airflow from the third chamber 231 and does not directly absorb airflow from the second chamber 12, where the fan 5 is located. By adopting such an arrangement, the flow transmission path of the airflow in the noise reduction device can be extended, thereby achieving a better purpose of sound attenuation and noise reduction.

[0159] like Figure 11b As shown, the second flow conduit 34 passes through the flange 31 and extends into the third chamber 231, so as to connect the second chamber 12 with the third chamber 231. The second flow conduit 34 passes through the flange 31 and the fastener 23 (i.e., the middle shell 3) in sequence and extends into the second chamber 12, so as to connect the first chamber 22 with the second chamber 12. It can be understood that since the first chamber 22 is located below the third chamber 231, the axial length of the first flow conduit 33 should be greater than the axial length of the second flow conduit 34 (please refer to the reference figure for the reference figure). Figure 24 ).

[0160] like Figure 8 、 Figure 9 、 Figure 10 、 Figure 11a and Figure 11b As shown, the air flow path within the noise reduction device is as follows: air enters the first chamber 22 through the air inlet 21 on the side wall of the lower housing 2, flows from the first chamber 22 to the first flow conduit 33, and then flows through the first flow conduit 33 into the second chamber 12. After entering the first chamber 22 from the air inlet 21, the air undergoes a nearly 180° circumferential rotation in the first flow channel 221 before reaching the gas inlet end of the first flow conduit 33, thus maximizing the airflow path within the first flow channel 221. After entering the second chamber 12, the air flows from the second chamber 12 to the second flow conduit 34, flows through the second flow conduit 34 into the third chamber 231, and from the third chamber 231 enters the fan's air inlet 53. Air at the fan's air outlet 54 exits the air chamber through the fan housing outlet 412 and is discharged out of the noise reduction device through the air outlet 11 on the top wall of the upper housing 1.

[0161] Therefore, it can be seen that the air flow path in the noise reduction device is longer, thereby achieving the purpose of reducing noise. In addition, when the air flows in each chamber, it undergoes a process of multiple changes in the cross-section of the flow chamber; for example, when the air enters the first chamber 22 from the air inlet 21, it enters the flow chamber with a larger cross-section (i.e., the first chamber 22) from the air inlet 21 with a smaller cross-section, and then enters the first guide tube 33 with a smaller cross-section from the first chamber 22, which is from the flow chamber with a larger cross-section to the flow chamber with a smaller cross-section; then it flows through the first guide tube 33 into the second chamber 12 with a larger cross-section, which is from the flow chamber with a smaller cross-section to the flow chamber with a larger cross-section; and then in The air flows from the second chamber 12 into the second air guide tube 34 with a smaller cross-section, and then from the flow chamber with a larger cross-section into the flow chamber with a smaller cross-section; then it flows through the second air guide tube 34 into the third chamber 231 with a larger cross-section, and then from the flow chamber with a smaller cross-section into the flow chamber with a larger cross-section; finally, it flows from the third chamber 231 into the air inlet 53 of the fan with a smaller cross-section, and then from the flow chamber with a larger cross-section into the air flow inlet with a smaller cross-section. By allowing the air to pass through the flow chambers with changing cross-sections in turn, it can effectively and effectively eliminate and reduce noise.

[0162] like Figure 14b and Figure 19 As shown, the first chamber 22 includes a first flow channel 221. The number of the first flow channels 221 can be, for example, multiple. The first flow channels 221 play a role in guiding and directing the airflow. Specifically, multiple baffles can be set in the first chamber 22 to construct the first flow channel 221. The baffles can be, for example, one or more of straight baffles, inclined baffles, and curved baffles. The shape of the first flow channel 221 can be various shapes, such as Figure 14b and Figure 19 Two different structural forms of the first flow channel 221 are shown respectively.

[0163] like Figure 14b and 19 As shown, the first flow channel 221 extends within the interior of the lower housing 2, with both ends of the first flow channel 221 facing the side wall of the lower housing 2 where the air inlet 21 is located. The first end of the first flow channel 221 is in fluid communication with the air inlet 21, while the second end of the first flow channel 221 is near the fluid inflow end of the first flow guide and is in fluid communication with the first flow guide. Therefore, it can be seen that after air enters the first flow channel 221 from the air inlet 21, it needs to flow a longer path within the lower housing 2 to meet the requirements of noise reduction. Therefore, the first flow channel 221 is constructed to ensure that the flow path of the airflow in the lower housing 2 is as long as possible.

[0164] like Figure 14bIn the example shown, the number of first flow channels 221 is three, and the first ends of the first flow channels 221 are arranged side by side so that they can all be connected to the air inlet 21. The second end of each first flow channel 221 diverges radially outward along the first fan sleeve 41. The second end of each first flow channel 221 diverges radially outward along the first fan sleeve 41. Since the guide inclined surface 331 of the first guide tube 33 extends into the first chamber 22 and is located above the second end of the first flow channel 221, the second end of the first flow channel 221 is set to a radially divergent structure, so that the airflow flowing out from the second end of the first flow channel 221 is also divergent, which is more conducive to the airflow entering each first guide tube 33 evenly.

[0165] In addition, if Figure 9 As shown, a flow monitoring device 6 , such as a flow sensor, may be further provided in the first flow channel 221 , which can monitor the flow rate of the airflow in the first flow channel 221 .

[0166] like Figure 14a and Figure 18 As shown, the fastener 23 can be made of a flexible material, such as a silicone material. Figure 14a and Figure 14b As shown, please combine Figure 11b The fastener 23 is disposed within the lower housing 2. The lower side of the fastener 23 and the inner wall of the lower housing 2 define and seal the first chamber 22, forming a sealed chamber through which air can flow. Similarly, the upper side of the fastener 23 and the sealing baffle 30 define a third chamber 231, also forming a sealed chamber through which air can flow. By making the fastener 23 from a flexible material, the fastener 23 can effectively absorb airflow vibrations within the first chamber 22 and the third chamber 231 formed by the fastener 23, thereby effectively buffering and reducing noise.

[0167] A connecting groove 235 is provided in the fastening member 23 , and the first flow guide tube 33 can pass through the connecting groove 235 and extend into the first chamber 22 so as to connect the first chamber 22 with the second chamber 12 .

[0168] like Figure 9 、 Figure 10 、 Figure 11a 、 Figure 11b and Figure 14a As shown, a guide cone 233 is provided on the lower surface of the third chamber 231, i.e., on the fastening member 23. The guide cone 233 is located below the fan housing air inlet 411 and extends toward the fan housing air inlet 411. The guide cone 233 is coaxial with the fan housing air inlet 411. The guide cone 233 is a tapered structure that decreases in diameter toward the fan housing air inlet 411. The airflow in the third chamber 231 can be guided by the guide cone 233 and enter the fan air inlet 53.

[0169] like Figure 21 As shown, the flange 31 (or the entire sealing baffle 30) is further provided with a plurality of guide vanes 313 on the underside. The guide vanes 313 extend into the third chamber 231, thereby organizing and guiding the airflow in the third chamber 231, allowing it to enter the fan's air inlet 53 along the guide cone 233. The guide vanes 313 can be of various structural forms, such as curved vanes, bent vanes, straight vanes, inclined vanes, etc., and this application is not limited thereto. At least one resonance cavity 232 is provided in at least one of the first chamber 22, the second chamber 12, and the third chamber 231.

[0170] The resonance cavity 232 is configured to allow the airflow within the resonance cavity 232 to resonate with sound waves of a specific frequency outside the resonance cavity 232 , thereby reducing noise at the specific frequency.

[0171] Specifically, when a sound wave of a certain frequency passes through the resonance cavity 232, it will cause resonance of the airflow in the resonance cavity 232. The vibration can convert part of the energy of the noise sound wave into heat energy, thereby achieving the purpose of noise reduction of the entire machine.

[0172] like Figure 14a As shown, an example is shown in which the resonance cavity 232 is located in the third cavity 231. The resonance cavity 232 in the third cavity 231 is also formed by the upper side of the fastener 23 and the sealing baffle 30. Figure 14a As shown, the resonance cavity 232 may be a separate cavity separated from the third cavity 231 .

[0173] like Figure 14a and Figure 14c As shown, an example is shown in which the third chamber 231 has two resonance cavities 232. Each resonance cavity 232 has a resonance cavity entrance 236, and each resonance cavity entrance 236 is configured as a hole or slot that passes through the fastening member 23, as shown in FIG. Figure 14a As shown, each resonance cavity inlet 236 is configured as an elongated hole.

[0174] like Figure 14c As shown, since the resonance cavity inlet 236 passes through the fastening member 23, it can be seen that the resonance cavity 232 can be fluidically connected to the first cavity 22 below the third cavity 231 through the resonance cavity inlet 236. In other words, the air in the first cavity 22 can enter the resonance cavity 232 through the resonance cavity inlet 236, thereby causing resonance of the airflow in the resonance cavity 232, thereby achieving the purpose of noise reduction.

[0175] The resonant cavity 232 may be implemented as follows.

[0176] First, perform a noise frequency test on the noise reduction device to obtain the frequency of the maximum noise (for example, 1500HZ).

[0177] Next, the volume V of the resonance cavity 232 is calculated according to the following formulas (1) and (2).

[0178]

[0179] Wherein, V is the volume of the resonance cavity 232; c is the speed of sound, which can be calculated as 340 m / s; f is the frequency of the maximum noise; S c is the diameter of the opening of the resonance cavity 232; l' c is the length of the opening of the resonance cavity 232.

[0180] The cross-sectional shape of the resonant cavity 232 can be rectangular, cylindrical, or any other shape, as long as its volume satisfies the above formula.

[0181] like Figure 14a 、 Figure 15 and Figure 16a As shown, the lower portion of the fastener 23 and the first chamber 22 also enclose an inlet flow channel 234, which is used to guide the airflow flowing in through the air inlet 21 into the first chamber 22. Since the air inlet 21 is located on the side wall of the lower shell 2, the air inlet 21 and the first chamber 22 can be fluidically connected through the inlet flow channel 234 to extend the flow path of the gas. Figure 16a As shown, one end of the inlet flow channel 234 is aligned with the air inlet 21 and is in fluid communication. Since the fastener 23 is located above the first chamber 22, the inlet flow channel 234 is constructed in the form of a bend structure. By changing the size of the air flow cross-section of the inlet flow channel 234, the Figure 16a As shown, the airflow (flowing in a direction perpendicular to the side wall of the lower shell 2) entering the inlet flow channel 234 from the air inlet 21 changes its flow direction to a vertical downward direction and then flows into the first chamber 22. Figure 25 、 Figure 26 and Figure 27 As shown, the air outlet 11 in the upper shell 1 is arranged correspondingly to the air outlet baffle 35 on the flange 31. Figure 27 As shown, an air outlet 13 is provided on a side wall of the upper shell 1, and the fan sleeve air outlet 412 passes through the air outlet 13 and extends into the air outlet cavity. The air outlet 13 can fix the third fan sleeve 413, and the air flow flowing out of the air outlet 54 of the fan can enter the air outlet cavity and flow out from the air outlet 11.

[0182] According to a third aspect of the present application, a ventilation therapy device is provided, comprising the aforementioned noise reduction device and a water tank. The noise reduction device is in fluid communication with the water tank, and gas flowing out of the air outlet 11 of the noise reduction device can enter the water tank for humidification. The humidified gas can then be provided to the patient for breathing. Furthermore, the ventilation therapy device may further include other components for achieving its necessary functions, all of which can be implemented using various existing methods, which will not be further described in this application.

[0183] It should be noted that the arrows in the drawings attached to this application indicate the direction of air flow.

[0184] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A noise reduction structure for a fan, characterized in that: comprising a flexible first fan cover, the first fan cover being used to cover at least a portion of the fan, the fan comprising an air inlet, one end of the first fan cover being provided with a fan cover air inlet, the fan cover air inlet corresponding to the air inlet of the fan, the fan cover air inlet being coaxial with the air inlet of the fan; In which, a flexible suspension structure is provided on the surface of the first fan cover close to the air inlet of the fan cover, and the suspension structure extends from the surface of the first fan cover along the axial direction of the first fan cover; the suspension structure includes a limiting portion, and the limiting portion is configured to limit the movement of the first fan cover within a preset range when the first fan cover is fixedly installed.

2. The noise reduction structure of the fan according to claim 1, characterized in that: A flexible support structure is provided on the surface of the first fan cover close to the air inlet of the fan cover, and the support structure extends from the surface of the first fan cover along the axial direction of the first fan cover; the support structure is constructed so that when the first fan cover is fixedly installed, the free end of the support structure contacts the installation surface of the first fan cover.

3. The noise reduction structure of the fan according to claim 2, characterized in that: The number of the suspension structures is at least two, and at least two of the suspension structures are arranged at intervals along the circumference of the first fan sleeve. The support structure is constructed to be located between the suspension structures along the circumference of the first fan sleeve, and the length of the suspension structure extending axially from the surface of the first fan sleeve is greater than the axial extension length of the support structure.

4. The noise reduction structure of a fan according to any one of claims 1 to 3, characterized in that: The suspension structure includes a lifting lug extending along the axial direction of the first fan sleeve, and the limiting portions are located on both sides of the lifting lug and protrude from the surface of the lifting lug.

5. The noise reduction structure of the fan according to claim 4, characterized in that: The limiting portion is configured as a blocking piece structure that extends obliquely from the surface of the lifting ear in a direction away from the free end of the lifting ear.

6. The noise reduction structure of the fan according to claim 4, characterized in that: The lifting lug is an arc-shaped structure having the same circumferential profile as that of the first fan sleeve.

7. The noise reduction structure of the fan according to claim 6, characterized in that: The free end of the lifting ear is provided with a mounting guide portion, and the surface of the mounting guide portion is provided with an anti-slip operation structure.

8. The noise reduction structure of a fan according to claim 2 or 3, characterized in that: The axial end surface of the support structure has one or more silencer channels, and the silencer channels are configured so that when the first fan sleeve is fixedly installed, air flows through the silencer channels and passes through both sides of the support structure.

9. The noise reduction structure of a fan according to any one of claims 1 to 3, characterized in that: The fan includes a motor, an impeller and a casing. The motor is connected to the impeller to drive the impeller to rotate. The casing at least surrounds the outside of the impeller. The first fan cover at least covers the surface of the casing corresponding to the impeller.

10. The noise reduction structure of the fan according to claim 9, characterized in that: A flexible buffer structure is provided on the side of the first fan cover away from the air inlet of the fan cover, and the buffer structure extends from the surface of the first fan cover along the axial direction of the first fan cover, and the extension direction of the buffer structure is opposite to the extension direction of the suspension structure; the buffer structure is constructed so that when the first fan cover is covered and installed on the fan, the top of the free end of the buffer structure is higher than the top of the motor of the fan.

11. The noise reduction structure of the fan according to claim 10, characterized in that: The buffer structure comprises at least two buffer structures, and the at least two buffer structures are arranged at intervals along the circumference of the first fan casing and surround the motor of the fan; and / or The buffer structure and the first fan cover are split structures or integrally formed structures.

12. The noise reduction structure of a fan according to any one of claims 1 to 3, characterized in that: It also includes a flexible second fan cover, which is located on the side of the first fan cover away from the fan cover air inlet, and is used to cover the motor of the fan. The second fan cover and the first fan cover are a split structure or an integral molded structure.

13. The noise reduction structure of a fan according to any one of claims 1 to 3, characterized in that: The invention further comprises a flexible third fan cover, wherein the fan comprises an air outlet, and the third fan cover is used for covering the air outlet of the fan; and / or The first fan cover and the third fan cover are of a split structure or an integrally formed structure.

14. A noise reduction device, comprising the noise reduction structure of a fan according to any one of claims 1 to 13, characterized in that: Also includes: a lower shell, wherein an air inlet is provided in the lower shell; an upper shell, the upper shell and the lower shell being buckled together, and an air outlet being provided in the upper shell; as well as A middle shell, the middle shell comprising a sealing baffle disposed on a side close to the upper shell and a fastening member disposed on a side close to the lower shell; A first chamber is formed between the fastening member and the lower shell, a second chamber is formed between the sealing baffle and the upper shell, and a third chamber is formed between the sealing baffle and the fastening member; The noise reduction structure of the fan is fixedly mounted on the sealing baffle via the suspension structure, and a ventilation opening is provided on the sealing baffle at a position corresponding to the air inlet of the fan housing, so that the air inlet of the fan installed in the first fan housing is exposed to the third chamber through the ventilation opening; The first chamber is in fluid communication with the second chamber, and the second chamber is in fluid communication with the third chamber; The fluid entering the noise reduction device through the air inlet can flow in the first chamber, the second chamber, and the third chamber in sequence, and then flow to the air inlet of the fan.

15. The noise reduction device according to claim 14, characterized in that: An air outlet cavity is also formed between the upper shell and the sealing baffle, and the air outlet is arranged in an area of the upper shell corresponding to the air outlet cavity. The air outlet cavity is fluidically isolated from the second chamber. The sealing baffle allows the air outlet of the fan to extend into the air outlet cavity when the fan is installed in the noise reduction device through the noise reduction structure of the fan, and the air inlet side of the fan is fluidically separated from the air outlet side of the fan.

16. The noise reduction device according to claim 14 or 15, characterized in that: The fastening component is made of flexible material.

17. The noise reduction device according to claim 14 or 15, characterized in that: A guide cone is provided on the fastening member, and the guide cone is located below the air inlet of the fan sleeve and extends in a direction close to the air inlet of the fan sleeve, and the guide cone is coaxial with the air inlet of the fan sleeve.

18. The noise reduction device according to claim 14 or 15, characterized in that: The sealing baffle 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.

19. The noise reduction device according to claim 18, characterized in that The hanging groove is configured as a flared groove, and a width of the flared groove on a side facing the first fan sleeve is greater than a width of the flared groove on a side away from the first fan sleeve.

20. The noise reduction device according to claim 14 or 15, characterized in that: The middle shell is provided with a first flow guide device that passes through the middle shell. Two ends of the first flow guide device extend into the first chamber and the second chamber respectively. The second chamber is fluidically connected to the first chamber through the first flow guide device.

21. The noise reduction device according to claim 14 or 15, characterized in that: A second flow guide device is provided on the sealing baffle, and two ends of the second flow guide device extend into the second chamber and the third chamber respectively. The third chamber is fluidically connected to the second chamber through the second flow guide device.

22. The noise reduction device according to claim 20, characterized in that The first flow guiding device includes at least one first flow guiding pipe, and the first flow guiding pipe extends along the axial direction of the first fan casing; and / or The end of the first flow guide pipe corresponding to the inflow of fluid is provided with a flow guide inclined surface.

23. The noise reduction device according to claim 21, characterized in that The second flow guiding device includes at least one second flow guiding pipe, the second flow guiding pipe extends along the axial direction of the first fan sleeve, and a flow guiding inclined surface is provided at one end of the second flow guiding pipe corresponding to the inflow of the fluid.

24. The noise reduction device according to claim 20, characterized in that The first chamber includes a first flow channel, which extends inside the lower shell and connects the air inlet end of the first flow channel to the air inlet fluid of the lower shell. The air outlet end of the first flow channel is located at the position of the first flow guide device corresponding to the fluid inlet end.

25. The noise reduction device according to claim 24, characterized in that There are multiple first flow channels, the air inlet ends of the multiple first flow channels are arranged side by side, and the air outlet ends of the multiple first flow channels diverge outward along the radial direction of the first fan sleeve.

26. The noise reduction device according to claim 14 or 15, characterized in that: At least one of the first chamber, the second chamber, and the third chamber is provided with at least one resonance cavity, and the resonance cavity is configured to enable the airflow in the resonance cavity to resonate with external sound waves of a specific frequency.

27. A ventilation therapy device, characterized in that: The noise reduction device according to any one of claims 14 to 26, further comprising a water tank, wherein the noise reduction device is in fluid communication with the water tank.

Images