A fan for a breathing machine with noise reduction function

Abstract

The application discloses a fan with a noise reduction function for a breathing machine, which comprises a volute, a volute air inlet and a volute air outlet are formed in the volute, the volute is internally provided with a wind cavity, an impeller is installed in the volute, the volute is internally provided with a shock absorption space for absorbing vibration energy generated when the impeller operates, the shock absorption space is filled with shock absorption medium, the shock absorption space is used for absorbing vibration energy generated when the impeller operates, a wind guide is installed in the wind cavity, the wind guide is internally provided with Q air channels, N winds entering the wind cavity flow out after flowing through the air channels in whole or in part, the impeller and the volute are provided with a backflow gap, and a noise reduction assembly is arranged in the backflow gap, the fan is provided with the shock absorption space, the noise reduction assembly, the noise reduction hole and the wind guide and the like, and the structures are associated with each other and influence each other, so that the noise reduction effect of the fan is very remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the fan technical field, specifically relates to a breathing machine fan with noise reduction function. BACKGROUND

[0002] In modern clinical medicine, breathing machine as an effective means to replace the self-ventilation function, has been widely used in respiratory failure caused by various reasons, anesthesia and respiratory management during major operation, respiratory support therapy and emergency resuscitation, in the modern medical field occupies a very important position. Breathing machine is a kind of vital medical equipment that can prevent and treat respiratory failure, reduce complications, save and prolong the life of patients.

[0003] The key components of breathing machine turbine fan. Because of the breathing machine manufacturer product iteration on turbine fan requirements increasing, the traditional breathing machine noise value is high, especially the wind noise, easy to affect the sleep of the patient, therefore, it is urgent to need to reduce the noise. SUMMARY

[0004] Therefore, the present application provides a breathing machine fan with noise reduction function, which can reduce the noise of the fan.

[0005] The technical scheme is as follows: a breathing machine fan with noise reduction function, comprising a volute, the volute is provided with a volute air inlet and a volute air outlet, the volute has a wind cavity inside, the volute is provided with an impeller, the impeller is close to the volute air inlet, and the key lies in that:

[0006] The volute has a shock absorption space, the shock absorption space is filled with shock absorption medium, and the shock absorption space is used for absorbing the vibration energy generated by the operation of the impeller;

[0007] The wind cavity is provided with a wind guide, the wind guide is located between the impeller and the volute air outlet, the wind guide has Q wind channels, Q is a natural number, and the wind entering the wind cavity flows out after flowing through the wind channels;

[0008] The impeller and the volute have a backflow gap, the backflow gap is provided with a noise reduction assembly, and the noise reduction assembly reduces the size of the backflow gap to achieve the purpose of noise reduction.

[0009] When the fan is running, the impeller will generate kinetic energy in the wind cavity, the kinetic energy collides with the inner wall of the volute to generate vibration, the vibration causes noise, the shock absorption space is set in the volute, the vibration energy generated in the shock absorption space, by the law of conservation of energy, the noise energy will make the shock absorption space vibrate, so as to reduce or eliminate the vibration, so as to reduce the noise.

[0010] The wind guide is arranged to guide the flow of the air, so that the flow direction of the air flowing out of the impeller is changed, the flow direction of the air is more consistent, and the flow speed is improved, so that the air does not form a multi-layer flow in the air cavity and does not hit the volute to generate a large sound, thereby reducing the noise.

[0011] The noise reduction assembly reduces the size of the backflow gap, increases the wind resistance of the backflow air, reduces the amount of backflow air, and further reduces the noise. The layers are associated with each other, and the noise reduction effect of the fan is very significant.

[0012] Preferably:

[0013] The above-mentioned impeller comprises two opposite panels, and blades are arranged between the two panels. A fan inlet is formed in one of the panels and faces the volute inlet. Adjacent blades form an air chamber, and the fan inlet is in communication with the air chamber. At least one panel has a noise reduction hole that connects at least one air chamber to the air cavity. The noise reduction hole functions as a flow guide. During the acceleration and deceleration of the fan, air enters the impeller through the noise reduction hole, reducing the flow rate in the volute cavity and preventing turbulence around the fan inlet caused by excessive or rapid flow rate changes, thereby reducing noise.

[0014] The above-mentioned volute comprises a lower volute and an upper volute that cooperate with each other. The lower volute has the shock absorption space, and the shock absorption medium is air. This structure is easy to manufacture and has low cost.

[0015] The above-mentioned lower volute comprises a bottom plate with a horn-shaped edge that bends upward to form a shell side wall. A cylindrical noise reduction body is installed in the lower volute. The side wall of the noise reduction body is vertical, and the shock absorption space is formed between the side wall of the noise reduction body and the shell side wall. This structure has good noise reduction effect.

[0016] The above-mentioned lower volute has a hollow space inside the shell, which forms the shock absorption space. This structure has good noise reduction effect.

[0017] The above-mentioned air cavity is annular, and the angle between the flow direction of the air in the air duct and the plane where the impeller is located is alpha (0°≤ alpha ≤ 180°). This structure can meet the noise reduction purpose.

[0018] The above-mentioned air guide piece comprises a first ring body, a second ring body and Q air guide pieces, Q is a natural number greater than or equal to 2, the inner side wall of the first ring body is close to the inner ring of the air cavity, the Q air guide pieces are distributed along the circumference of the first ring body, the outer side edges of all the air guide pieces are jointly connected with the second ring body, at least a part of the outer side wall of the second ring body is close to the outer ring of the air cavity in a ring shape, and the air guide pieces are formed between adjacent air guide pieces. By adopting the structure, the noise reduction effect is good.

[0019] The above-mentioned air guide piece comprises a cylindrical cylinder body, the inner side wall of the cylinder body is close to the inner ring of the air cavity, at least a part of the outer side wall of the cylinder body is close to the outer ring of the air cavity in a ring shape, and Q air holes are formed in the cylinder body, the air holes forming the air duct. By adopting the structure, the noise reduction effect is good.

[0020] The air guide piece comprises a cylindrical cylinder body, the inner side wall of the cylinder body is close to the inner ring of the air cavity, and Q annular air grooves are formed in the outer side wall of the cylinder body, the air grooves are communicated with the air cavity, and the air grooves form the air duct. By adopting the structure, part of the air in the air cavity enters the air groove and flows along the air groove, the flow rate and direction of the air in the air groove are changed, the air in the air groove interferes with the noise generated by the impact of the air in the air cavity on the volute, and the noise reduction effect is achieved.

[0021] The above-mentioned noise reduction assembly comprises at least one first noise reduction convex strip, the first noise reduction convex strip is annular and surrounds the air inlet of the impeller;

[0022] Further comprising a circular annular second noise reduction convex strip and a circular annular noise reduction groove, the second noise reduction convex strip or the noise reduction groove is located on the impeller, and the other is located on the inner wall of the volute below the impeller, the second noise reduction convex strip surrounds the air inlet of the impeller, and the second noise reduction convex strip enters the noise reduction groove after passing through the backflow gap.

[0023] By adopting the above-mentioned scheme, the first noise reduction convex strip forms a similar air baffle structure on the backflow path of the backflow air, so that the backflow resistance is increased, the backflow amount is reduced, further, a small amount of backflow air needs to bypass the second noise reduction convex strip to continue to backflow, and since a part of the second noise reduction convex strip enters the noise reduction groove, it is very difficult to bypass the structure, so that the amount of backflow air is extremely small, and the noise of the fan can be greatly reduced.

[0024] Compared with the prior art, the beneficial effects of the present application are that the noise reduction holes on the impeller play a guiding role, in the process of acceleration and deceleration of the fan, air enters the inside of the impeller from the noise reduction holes, so that the fluid in the inner cavity of the volute is reduced and the flow rate is reduced, and the air inlet of the impeller will not produce turbulent flow due to excessive or rapid reduction of the flow rate, thereby reducing the noise;

[0025] And the fan in operation impeller in the wind cavity of volute produces kinetic energy, the kinetic energy and the inner wall of volute collide and produce vibration, vibration causes noise, by setting the shock absorbing space in the volute, the vibration energy generated will spread in the shock absorbing space, by the law of conservation of energy, the noise energy generated will make the shock absorbing space vibrate, thereby reducing or eliminating vibration, so that the noise emitted is reduced;

[0026] The effect of setting the air guide piece is that after the air flows out of the impeller, the air is guided by the air guide piece, so that the fluid originally flowing along the rotation direction of the impeller is reversed, the outflow direction of the fluid is more consistent, and the flow rate is improved, avoiding the formation of multi-layer flow in the wind cavity and impacting the volute to produce larger sound, thereby reducing noise;

[0027] And the noise reduction assembly reduces the size of the backflow gap, increases the wind resistance of the backflow air, reduces the backflow air volume, and further reduces the noise, so that the noise reduction effect of the fan is very significant. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application

[0029] Figure 2 It is a schematic diagram of the plane structure of the present application

[0030] Figure 3 It is Figure 2 A-A sectional view of

[0031] Figure 4 It is Figure 3 The enlarged view of a part of

[0032] Figure 5 It is a schematic diagram of another form of shock absorbing space

[0033] Figure 6 It is Figure 5 B-B sectional view of

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the impeller

[0035] Figure 8 It is a schematic diagram of the plane structure of the impeller

[0036] Figure 9 It is Figure 8 D-D sectional view of

[0037] Figure 10 It is Figure 8 C-C sectional view of

[0038] Figure 11 It is a schematic diagram of the three-dimensional structure of the first air guide piece

[0039] Figure 12 is a schematic view of a planar structure of a first air guide member;

[0040] Figure 13 is a schematic view of a planar structure of a first air guide member; Figure 12 is an E-E sectional view of the first air guide member;

[0041] Figure 14 is a schematic view of a three-dimensional structure of a second air guide member;

[0042] Figure 15 is a schematic view of a three-dimensional structure of a third air guide member;

[0043] Figure 16 is a schematic view of a three-dimensional structure of a fourth air guide member. DETAILED DESCRIPTION

[0044] The application will be further described below in conjunction with the embodiments and the accompanying drawings.

[0045] As shown in Figures 1-4 a blower with a noise reduction function for a breathing machine, comprising a volute 1, the volute 1 is provided with a volute air inlet 2 and a volute air outlet 3, the volute 1 has an air cavity 4 inside, the volute 1 is provided with an impeller 5, the impeller 5 is close to the volute air inlet 2, the impeller 5 is driven by a motor (not shown in the figure), air enters the impeller 5 from the volute air inlet 2 and then flows into the air cavity 4, and then flows out from the volute air outlet 3.

[0046] The volute 1 has a shock absorption space 8, the shock absorption space 8 is filled with shock absorption medium, the shock absorption space 8 is used to absorb the vibration energy generated by the impeller 5 during operation in the volute 1, the volute 1 comprises a lower volute 101 and an upper volute 102 which cooperate with each other, the lower volute 101 has the shock absorption space 8, and the shock absorption medium is air.

[0047] The lower volute 101 comprises a bottom plate 101a, the edge of the bottom plate 101a is bent upward to form a shell side wall 101b, the volute 1 is provided with a cylindrical noise reduction body 10, the side wall of the noise reduction body 10 is vertical, and the shock absorption space 8 is formed between the side wall of the noise reduction body 10 and the shell side wall 1b.

[0048] The side wall of the noise reduction body 10 is bent inward to form a mounting portion at the bottom, the mounting portion is fixedly installed on the bottom plate 101a, the inner wall of the noise reduction body 10 is stepped upward from the bottom, and in this embodiment, the mounting portion is integrally formed with the bottom plate 101a.

[0049] The volute 1 has a fan blade mounting space for mounting the impeller, the volute 1 below the fan blade mounting space is provided with a gas guide hole 11, and the area of the shell side wall 101b close to the bottom plate 101a is the fan blade mounting space. In this embodiment, the inside of the noise reduction body 10 is the fan blade mounting space, and the impeller 5 is mounted in the noise reduction body 10. The gas guide hole 11 can be located on the shell side wall 101b below the impeller 5 or on the bottom plate 101a.

[0050] In this example, the bottom plate 101a is provided with the air inlet 2, and the bottom plate 101a is provided with the gas guide hole 11. Preferably, the bottom plate 101a is provided with M gas guide holes 11, M is a natural number, and the M gas guide holes 11 are uniformly distributed around the air inlet 3. The gas guide hole 11 is a circular hole.

[0051] As shown in Figure 5 and 6 Another formation of the shock absorption space 8 is:

[0052] The shell inside the volute 1 has a hollow space, which forms the shock absorption space 8. Specifically, the inside of the bottom plate 101a and / or the shell side wall 101b is hollow to form the shock absorption space 8. In this example, the inside of the bottom plate 101a and the shell side wall 101b is hollow, and the hollow spaces of the two are connected to form the shock absorption space 8.

[0053] As shown in Figures 7-10 The impeller 5 includes two oppositely arranged panels 501, and blades 502 are arranged between the two panels 501. The top of all blades 502 is connected to one of the panels 501, and the bottom of all blades 502 is connected to the other panel 501. One of the panels 501 is provided with an impeller air inlet 504, which is opposite to the volute air inlet 2. All blades 502 are uniformly distributed around the impeller air inlet 504, and adjacent blades 502 form an air chamber 503. The impeller air inlet 504 is in communication with the air chamber 503. At least one of the panels 501 is provided with a noise reduction hole 505, which communicates at least one air chamber 503 with the air cavity 4.

[0054] The impeller air inlet 504 is communicated with the inner end of the air chamber 503, the outer end of the air chamber 503 is communicated with the air cavity 4, preferably, the noise reduction holes 505 are arranged on the two panels 501, further, the noise reduction holes 505 are arranged on the two panels 501 corresponding to each air chamber 503, the noise reduction holes 505 on the two panels 501 are communicated with the two side surfaces of the corresponding air chamber 503 and the inner cavity of the noise reduction body 10, and the inner cavity of the noise reduction body 10 is communicated with the air cavity 4.

[0055] The noise reduction holes 505 are circular holes, and all the noise reduction holes 505 on the same panel 501 are uniformly distributed around the impeller air inlet 504. Of course, the noise reduction holes 505 can also be square holes, triangular holes, special-shaped holes and the like, and the noise reduction holes 505 on the two panels 501 can be arranged opposite to each other or staggered, in the present application, the noise reduction holes 505 on one of the panels 501 are circular holes, the circular holes are close to the air inlet, and the noise reduction holes 505 on the other panel are special-shaped holes, the circular holes and the special-shaped holes corresponding to the same air cavity are close to the two adjacent blades 502 respectively.

[0056] As shown in Figure 3 and 4 The impeller 5 and the volute 1 have a backflow gap 9, and a noise reduction assembly is arranged in the backflow gap 9, the noise reduction assembly reduces the size of the backflow gap 9 to achieve the purpose of noise reduction.

[0057] The impeller 5 is a centrifugal impeller, and the impeller 5 and the lower volute 101 have the backflow gap 9.

[0058] The noise reduction assembly includes at least one first noise reduction convex strip 506, the first noise reduction convex strip 506 is annular and surrounds the impeller air inlet 504.

[0059] The noise reduction assembly further comprises a circular annular second noise reduction convex strip 507 and a circular annular noise reduction groove 508, the second noise reduction convex strip 507 or the noise reduction groove 508 is located on the impeller 503, and the other is located on the inner wall of the lower volute 101, the second noise reduction convex strip 507 surrounds the impeller air inlet 504, and the second noise reduction convex strip 507 enters the noise reduction groove 508 after passing through the backflow gap 9, that is, the second noise reduction convex strip 507 can be arranged on the impeller 5 or the inner wall of the lower volute 101, and in the application, the second noise reduction convex strip 507 is fixed on the panel of the impeller 5 close to the inner wall of the lower volute 101, the noise reduction groove 508 is arranged on the inner wall of the lower volute 101, and the width of the noise reduction groove 508 is greater than the arm thickness of the second noise reduction convex strip 507, so that when the impeller 5 rotates, the second noise reduction convex strip 507 can rotate freely in the noise reduction groove 508. Of course, it can also be the other way around, that is, the noise reduction groove is arranged on the impeller, and the second noise reduction convex strip 507 is arranged on the inner wall of the lower volute.

[0060] The two first noise reduction convex strips 506 are arranged on the two panels 501 of the impeller 5 respectively, and the two first noise reduction convex strips 506 are close to the edges of the panels respectively, the second noise reduction convex strip 507 is close to the impeller air inlet 504, so that when a part of the wind thrown by the impeller enters the backflow gap, the wind meets the blockage, the backflow amount is reduced, the wind meets the second first noise reduction convex strip 506 again when continuing to backflow, the wind resistance is further increased, the wind finally meets the second noise reduction convex strip 507, the wind resistance is suddenly and greatly increased, and the backflow amount is very small, so that the backflow amount is reduced, the noise caused by the backflow wind impacting the shell is reduced, and the small amount of backflow wind can be further discharged through the air guide hole 11.

[0061] The first noise reduction convex strip 506 and the second noise reduction convex strip 507 are integrally formed with the impeller.

[0062] Of course, a support structure can also be arranged on the inner wall of the shell or the surface of the impeller, and the first noise reduction convex strip 506 and the second noise reduction convex strip 507 are arranged on the support structure, as long as they are in the backflow gap.

[0063] As shown in Figure 3 As shown in FIG. 6, a wind guide 6 is arranged in the wind cavity 4, the wind guide 6 is located between the impeller 5 and the volute air outlet 3, the wind guide 6 has Q air channels 7, Q is a natural number, and all or part of the wind entering the wind cavity 4 flows out after flowing through the air channels 7.

[0064] The upper volute 102 comprises a cover plate which is buckled on the top of the shell side wall 101b, and the two are connected by buckle connection. A part of the cover plate in the middle is recessed towards the bottom plate 101a to form an inner cylinder, and the driving motor can be installed in the inner cylinder. The side wall of the inner cylinder and the shell side wall 101b form an annular air cavity 4, and the bottom of the inner cylinder and the bottom plate 101a form a impeller mounting space in which the impeller 5 is arranged. The driving shaft of the driving motor extends into the impeller mounting space and is connected with the impeller 5.

[0065] The angle between the flow direction of the air in the air duct 7 and the plane in which the impeller 5 is located is α, and 0°≤α≤180°. The value of Q can be 1, 2, 3, 4, 5, 6, and the like in turn.

[0066] The structure of the air guide piece 6 can be various, such as Figures 11-15 In this structure, all the air in the air cavity 4 flows out through the air duct 7, and at this time 0°<α<180°.

[0067] As shown in the figure, the first structure of the air guide piece is: Figures 11-13

[0068] The air guide piece 6 comprises a first ring body 602, a second ring body 603 and Q air guide pieces 601, Q is a natural number greater than or equal to 2, and in this example Q=6. The inner side wall of the first ring body 602 closely abuts the inner ring of the air cavity 4. The Q air guide pieces 601 are distributed along the circumference of the first ring body 602. The outer side edges of all the air guide pieces 601 are connected with the second ring body 603. At least a part of the outer side wall of the second ring body 603 closely abuts the outer ring of the air cavity 4 in a ring shape. The air duct 7 is formed between adjacent air guide pieces 601. The width of the air guide piece 602 refers to the width along the radial direction of the air cavity.

[0069] That is, the inner side wall of the first ring body 602 closely abuts and is connected with the side wall of the inner cylinder. The outer wall of the second ring body 603 can closely abut the shell side wall 101b in a ring shape or not. In this way, the air guide piece 6 is clamped in the air cavity 4 in the radial direction, and the air in it needs to pass through the air duct before it can be discharged, and cannot be discharged from other gaps. The air guide piece 601 is arranged obliquely, and the oblique angle is α, which can be 5°, 10°, 15°, 20°, 25°, 30°, and the like in turn.

[0070] Another deformation in this structure is that the air guide piece can not contain the first ring body and the second ring body. In this way, there are two deformations:

[0071] ​① The air guide 6 comprises Q pieces of air guide sheets 601, Q is a natural number greater than or equal to 2, the Q pieces of air guide sheets 601 are distributed circumferentially in the air cavity 4, the width of the air guide sheet 601 is equal to the width of the ring wall of the air cavity 4, the width of the air guide sheet 601 refers to the radial width of the air guide sheet 601, the air duct 7 is formed between adjacent air guide sheets 601, that is, the air guide sheets 601 are uniformly distributed along the circumference of the inner cylinder 104, the inner side of the air guide sheet 601 is connected to the inner wall of the shell side wall 101b, and the outer side of the air guide sheet 601 is connected to the inner wall of the shell side wall 101b. The air guide sheet 601 is arranged obliquely, and the oblique angle α can be 5°, 10°, 15°, 20°, 25°, 30°, and the like.

[0072] ② The air guide 6 comprises a first ring body 602 and Q pieces of air guide sheets 601, Q is a natural number greater than or equal to 2, the Q pieces of air guide sheets 601 are distributed circumferentially along the first ring body 602, the inner side wall of the first ring body 602 is close to the inner ring of the air cavity 4, and the width of any one of the air guide sheets 601 and the width of the ring wall of the first ring body 601 are equal to the width of the ring wall of the air cavity 4. The air duct 7 is formed between adjacent air guide sheets 601, and the width of the air guide sheet 602 refers to the radial width of the air guide sheet 602. That is, the inner side wall of the first ring body 602 is close to and connected to the side wall of the inner cylinder, and the outer side edge of the air guide sheet 601 abuts against the inner wall of the shell side wall 101b. The air guide sheet 601 is arranged obliquely, and the oblique angle α can be 5°, 10°, 15°, 20°, 25°, 30°, and the like.

[0073] As shown in Figure 14 , the second structure of the air guide is:

[0074] The air guide 6 comprises a cylindrical cylinder body 601', the inner side wall of the cylinder body 601' is close to the inner ring of the air cavity 4, and at least a part of the outer side wall of the cylinder body 601' is close to the outer ring of the air cavity 4. Q air holes are formed on the cylinder body 601', the air holes are arranged along the length direction of the cylinder body 601', and the air holes form the air duct 7. That is, the inner side wall of the cylinder body 601' is close to and connected to the side wall of the inner cylinder, and the outer side wall is close to the shell side wall. In the radial direction, the air guide 6 is clamped in the air cavity 4, and the air in the air guide 6 can be discharged only through the air holes, and cannot be discharged from other gaps. The air hole can be an inclined hole, as shown in Figure 14 , the inclined hole refers to the included angle β between the center line of the air hole and the center line of the cylinder body 601' being greater than zero. β can be any value, 5°, 10°, 20°, 30°, and so on up to infinitely close to 90°. Of course, the air hole can also be a vertical hole, as shown in Figure 15 , the vertical here refers to being parallel to the center line of the cylinder body 601'.

[0075] Figure 16For the fourth structure of the air guide 6, a part of the air in the air cavity 4 flows out through the air channel 7, and 0°≤α≤180°. Specifically, the air guide 6 comprises a cylindrical barrel 601', the inner side wall of the barrel 601' is close to the inner ring of the air cavity 4, that is, the inner side wall of the barrel 601' is close to and connected with the side wall of the inner barrel, and Q annular air grooves are formed on the outer side wall of the barrel 601', Q is a natural number, the air grooves are communicated with the air cavity 4, and the air grooves form the air channel 7, Figure 3 The air guide 6 installed in the middle is of this structure.

[0076] Finally, it should be noted that the above description is only the preferred embodiments of the present application, and those skilled in the art can make various similar modifications under the inspiration of the present application without departing from the purpose and scope of the present application, and such modifications fall within the protection scope of the present application.

Claims

1. A ventilator fan with noise reduction function, comprising a volute (1) having a volute inlet (2) and a volute outlet (3) thereon, the volute (1) having an air chamber (4) inside, and an impeller (5) installed inside the volute (1), the impeller (5) being close to the volute inlet (2), characterized in that: The volute (1) has a shock-absorbing space (8) inside, which is filled with a shock-absorbing medium. The shock-absorbing space (8) is used to absorb the vibration energy generated when the impeller (5) is running. An air guide (6) is installed inside the air cavity (4). The air guide (6) is located between the impeller (5) and the air outlet (3) of the volute. The air guide (6) has Q air ducts (7), where Q is a natural number. All or part of the air entering the air cavity (4) flows out after passing through the air ducts (7). The air cavity (4) is annular, and the angle between the airflow direction in the air duct (7) and the plane where the impeller (5) is located is α, 0°≤α≤180°; There is a reflux gap (9) between the impeller (5) and the volute (1), and a noise reduction component is provided in the reflux gap (9). The noise reduction component achieves the purpose of noise reduction by reducing the size of the reflux gap (9). The noise reduction component includes at least one first noise reduction ridge (506), which is annular and surrounds the impeller inlet (504). It also includes a second noise-reducing protrusion (507) in the shape of a ring and a noise-reducing groove (508) in the shape of a ring. The second noise-reducing protrusion (507) or the noise-reducing groove (508) is located on the impeller (5), and the other is located on the inner wall of the volute (1) below the impeller (5). The second noise-reducing protrusion (507) surrounds the air inlet (504) of the impeller. The second noise-reducing protrusion (507) passes through the return gap (9) and enters the noise-reducing groove (508). The bottom plate (101a) of the volute (1) is provided with a plurality of air guide holes (11), which are evenly distributed around the air inlet (2) of the volute. The air guide holes (11) connect the return gap (9) with the outside. The impeller (5) includes two opposing panels (501), with blades (502) disposed between the two panels (501). One of the panels (501) has an impeller inlet (504) which is directly opposite the volute inlet (2). An air chamber (503) is formed between adjacent blades (502), and the impeller inlet (504) communicates with the air chamber (503). Both panels (501) have... A noise reduction hole (505) is provided, wherein a plurality of circular noise reduction holes are provided on the panel (501) facing the air inlet (2) of the volute, the plurality of circular noise reduction holes are evenly distributed around the air inlet (504) of the impeller, and the noise reduction hole (505) connects at least one of the air chambers (503) to the air cavity (4), and a plurality of irregularly shaped noise reduction holes are provided on another panel (501), and the area of ​​the irregularly shaped noise reduction holes is larger than the area of ​​the circular noise reduction holes.

2. The ventilator fan with noise reduction function according to claim 1, characterized in that: The volute (1) includes a lower volute (101) and an upper volute (102) that cooperate with each other. The lower volute (101) has the shock-absorbing space (8) inside, and the shock-absorbing medium is air.

3. A ventilator fan with noise reduction function according to claim 2, characterized in that: The lower volute (101) includes a base plate (101a), the edge of which is bent upward in a trumpet shape to form a shell sidewall (101b). A cylindrical noise reduction body (10) is installed inside the lower volute (101). The sidewall of the noise reduction body (10) is vertical. The shock absorption space (8) is formed between the sidewall of the noise reduction body (10) and the shell sidewall (101b).

4. A ventilator fan with noise reduction function according to claim 2, characterized in that: The lower volute (101) has a hollow space inside, which forms the shock-absorbing space (8).

5. A ventilator fan with noise reduction function according to any one of claims 1-4, characterized in that: The air guide (6) includes a first ring body (602), a second ring body (603), and Q air guide vanes (601), where Q is a natural number greater than or equal to 2. The inner sidewall of the first ring body (602) is in close contact with the inner ring of the air cavity (4). N air guide vanes (601) are distributed circumferentially along the first ring body (602). The outer sides of all air guide vanes (601) are connected to the second ring body (603). At least a portion of the outer sidewall of the second ring body (603) is in close contact with the outer ring of the air cavity (4). The air duct (7) is formed between adjacent air guide vanes (601).

6. A ventilator fan with noise reduction function according to any one of claims 1-4, characterized in that: The air guide (6) includes a cylindrical body (601'), the inner sidewall of which is in close contact with the inner ring of the air cavity (4), and at least a portion of its outer sidewall is circumferentially attached to the outer ring of the air cavity (4). Q air holes are provided on the cylindrical body (601'), and the air holes form the air duct (7).

7. A ventilator fan with noise reduction function according to any one of claims 1-4, characterized in that: The air guide (6) includes a cylindrical body (601'), the inner wall of which is in close contact with the inner ring of the air cavity (4), and Q annular air grooves are provided on the outer wall of the cylindrical body (601'). The air grooves are connected to the air cavity (4) and thus form the air duct (7).

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