阅读说明：本技术 风机组件和空调器 (Fan assembly and air conditioner ) 是由 董明珠 向新贤 陈志伟 陈英强 吴俊鸿 梁博 黄鑫 于 2019-11-08 设计创作，主要内容包括：本申请提供一种风机组件和空调器。该风机组件包括风机壳体(10),风机壳体(10)内设置有安装支架(11)、电机(12)和风叶,电机(12)固定设置在安装支架(11)上,风叶设置在电机(12)的驱动端,风机壳体(10)的第一端设置有安装止口(14),风机壳体(10)的第二端设置有紧固结构(15)。根据本申请的风机组件,能够简化风机的拆装结构,提高风机的拆装效率。(The application provides a fan subassembly and air conditioner. The fan assembly comprises a fan shell (10), wherein a mounting support (11), a motor (12) and fan blades are arranged in the fan shell (10), the motor (12) is fixedly arranged on the mounting support (11), the fan blades are arranged at the driving end of the motor (12), a mounting spigot (14) is arranged at the first end of the fan shell (10), and a fastening structure (15) is arranged at the second end of the fan shell (10). According to the fan assembly, the disassembly and assembly structure of the fan can be simplified, and the disassembly and assembly efficiency of the fan is improved.)

1. The fan assembly is characterized by comprising a fan shell (10), wherein a mounting support (11), a motor (12) and fan blades are arranged in the fan shell (10), the motor (12) is fixedly arranged on the mounting support (11), the fan blades are arranged at the driving end of the motor (12), a mounting spigot (14) is arranged at the first end of the fan shell (10), and a fastening structure (15) is arranged at the second end of the fan shell (10).

2. The fan assembly of claim 1, wherein the fan blades are counter-rotating axial fan blades (13).

3. The fan assembly according to claim 1, wherein the mounting bracket (11) comprises an annular connecting portion (16) and a connecting arm (17) disposed on a peripheral side of the annular connecting portion (16), the connecting arm (17) extending in a radial direction of the annular connecting portion (16), the motor (12) being fixedly disposed on the annular connecting portion (16).

4. The fan assembly according to claim 3, wherein a connecting convex ring (18) is arranged in the middle of the motor (12), and the annular connecting portion (16) is sleeved outside the motor (12) and is fixedly connected with the connecting convex ring (18).

5. The fan assembly according to claim 4, characterized in that the circumferential edge of the mounting bracket (11) is provided with a circumferential flange (19), and the circumferential flange (19) is turned over in a direction away from the annular connecting part (16).

6. The fan assembly according to claim 5, characterized in that the end of the connecting arm (17) is further provided with an end flange (20), the end flange (20) is spaced apart from the circumferential flange (19), and the end flange (20) is provided with a connecting hole.

7. The fan assembly according to claim 4, characterized in that a wire passage groove (21) is provided on the circumferential flange (19) of at least one of the connecting arms (17).

8. The fan assembly according to claim 2, wherein the mounting distance between two of the counter-rotating axial-flow fan blades (13) is b, the axial length of the fan housing (10) is a, the diameter of the fan blades is d, wherein a/b is more than or equal to 8 and less than or equal to 12, and b/d is more than or equal to 0.3 and less than or equal to 0.6.

9. The fan assembly according to claim 3, wherein a clamping groove (22) is formed in the inner peripheral wall of the fan housing (10), and the connecting arm (17) is clamped in the clamping groove (22) and fixedly connected with the fan housing (10).

10. An air conditioner comprising a fan assembly, wherein the fan assembly is as claimed in any one of claims 1 to 9.

11. The air conditioner according to claim 10, further comprising a base (23), a first air opening assembly (24) and a second air opening assembly (25) which are sequentially arranged from bottom to top, wherein the fan assembly is detachably connected between the first air opening assembly (24) and the second air opening assembly (25).

12. The air conditioner according to claim 11, further comprising a heat exchanger disposed in the first air inlet assembly (24), wherein a flow guiding device is disposed in an air duct between the heat exchanger and the fan, the flow guiding device comprises a flow guiding ring (1) and a rectifying plate (2) disposed in the flow guiding ring (1), the rectifying plate (2) extends along an axial direction of the flow guiding ring (1), two sides of the rectifying plate (2) are connected to an inner wall of the flow guiding ring (1), and the rectifying plate (2) divides a flow guiding channel of the flow guiding ring (1) into at least two rectifying areas.

Technical Field

The application relates to the technical field of air conditioning, in particular to a fan assembly and an air conditioner.

Background

With the improvement of living standard of people, the requirement on the air conditioner is higher and higher. The conventional mode of cooling and heating cannot meet the requirements of people. Therefore, heating carpet type air supply and refrigerating waterfall type air supply are becoming a trend of the air conditioning industry. The existing cabinet machine usually adopts two modes of air inlet at two sides, air outlet at the upper part, air inlet at the rear part and air outlet at the front part, and the two modes can not realize the heating carpet type air supply and the refrigerating waterfall type air supply functions of the cabinet machine, thereby influencing the use comfort of users.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a fan subassembly and air conditioner, can simplify the dismouting structure of fan, improves the dismouting efficiency of fan.

In order to solve the problem, the application provides a fan assembly, including the fan casing, be provided with installing support, motor and fan blade in the fan casing, the motor is fixed to be set up on the installing support, and the fan blade setting is at the drive end of motor, and the first end of fan casing is provided with the installation tang, and the second end of fan casing is provided with fastening structure.

Preferably, the fan blades are counter-rotating axial flow fan blades.

Preferably, the mounting bracket includes an annular connecting portion and a connecting arm disposed on a peripheral side of the annular connecting portion, the connecting arm extends in a radial direction of the annular connecting portion, and the motor is fixedly disposed on the annular connecting portion.

Preferably, the middle part of the motor is provided with a connecting convex ring, and the annular connecting part is sleeved outside the motor and is fixedly connected with the connecting convex ring.

Preferably, the periphery of the mounting bracket is provided with a circumferential flange, and the circumferential flange is turned towards the direction far away from the annular connecting part.

Preferably, the end of the connecting arm is further provided with an end flanging, the end flanging and the circumferential flanging are arranged at intervals, and the end flanging is provided with a connecting hole.

Preferably, a wire passing groove is arranged on the circumferential turn-over edge of at least one connecting arm.

Preferably, the installation distance between two blades of the counter-rotating axial-flow fan blade is b, the axial length of the fan shell is a, the diameter of the fan blade is d, wherein a/b is more than or equal to 8 and less than or equal to 12, and b/d is more than or equal to 0.3 and less than or equal to 0.6.

Preferably, a clamping groove is formed in the inner peripheral wall of the fan shell, and the connecting arm is clamped in the clamping groove and fixedly connected with the fan shell.

According to another aspect of the present application, there is provided an air conditioner including a fan assembly as described above.

Preferably, the air conditioner further comprises a base, a first air opening assembly and a second air opening assembly which are sequentially arranged from bottom to top, wherein the fan assembly is detachably connected between the first air opening assembly and the second air opening assembly.

Preferably, the air conditioner further comprises a heat exchanger arranged in the first air port assembly, a flow guide device is arranged in an air duct between the heat exchanger and the fan, the flow guide device comprises a flow guide ring and a rectifying plate arranged in the flow guide ring, the rectifying plate extends along the axial direction of the flow guide ring, two sides of the rectifying plate are connected to the inner wall of the flow guide ring, and the rectifying plate divides a flow guide channel of the flow guide ring into at least two rectifying areas.

The application provides a fan subassembly, including fan casing, be provided with installing support, motor and fan blade in the fan casing, the motor is fixed to be set up on the installing support, and the fan blade setting is at the drive end of motor, and fan casing's first end is provided with the installation tang, and fan casing's second end is provided with fastening structure. This fan subassembly is including setting up the installation tang at first end and setting up the fastening structure at the second end, can dismantle the connection through realizing between installation tang and the fastening structure and the adjacent structure, and connection structure is simple, installs and removes the convenience, be convenient for realize the modular design of fan subassembly, be favorable to improving production efficiency, because the fan subassembly is solitary modular structure, consequently can reduce the operation degree of difficulty in the fan installation, simplify the dismouting structure of fan, and then improve the dismouting efficiency of fan.

Drawings

Fig. 1 is a schematic perspective view illustrating a deflector of an air conditioner according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view illustrating a deflector of an air conditioner according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is an exploded view of a fan assembly according to an embodiment of the present disclosure;

FIG. 5 is an isometric view of a fan assembly according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional structural view of a blower assembly according to an embodiment of the present application;

fig. 7 is a structural view of an air conditioner according to an embodiment of the present application.

The reference numerals are represented as:

1. a flow guide ring; 2. a rectifying plate; 3. a first muffling hole; 4. a first inner cylinder; 5. a first outer barrel; 6. a second inner barrel; 7. a second outer barrel; 8. a transverse baffle; 9. a second muffling hole; 10. a fan housing; 11. mounting a bracket; 12. a motor; 13. counter-rotating axial flow fan blades; 14. installing a spigot; 15. a fastening structure; 16. an annular connecting portion; 17. a connecting arm; 18. a connecting convex ring; 19. flanging circumferentially; 20. flanging the end part; 21. a wire passing groove; 22. a card slot; 23. a base; 24. a first tuyere assembly; 25. a second tuyere assembly.

Detailed Description

Referring to fig. 1 to 7 in combination, according to an embodiment of the present application, the fan assembly includes a fan housing 10, a mounting bracket 11, a motor 12 and a fan blade are disposed in the fan housing 10, the motor 12 is fixedly disposed on the mounting bracket 11, the fan blade is disposed at a driving end of the motor 12, a first end of the fan housing 10 is provided with a mounting spigot 14, and a second end of the fan housing 10 is provided with a fastening structure 15.

This fan subassembly is including setting up at the installation tang 14 of first end and setting up the fastening structure 15 at the second end, can dismantle the connection through realizing between installation tang 14 and fastening structure 15 and the adjacent structure, and connection structure is simple, and the convenience is installed and removed, be convenient for realize the modularized design of fan subassembly, be favorable to improving production efficiency, because the fan subassembly is solitary modular structure, consequently, can reduce the operation degree of difficulty in the fan installation, simplify the dismouting structure of fan, and then improve the dismouting efficiency of fan.

The installation seam allowance 14 is a stepped installation bulge or a stepped installation groove, insertion matching with other structures can be achieved, a connection structure is further arranged at the position of the installation seam allowance 14, after the fan assembly is in insertion matching with other structures through the installation seam allowance 14, connection and fixation between the fan assembly and other structures can be achieved through the connection structure, and stability and reliability of the connection structure between the fan assembly and the structures are guaranteed.

The fastening structure 15 is, for example, a connecting block, and the connecting block may be provided with bolt holes for aligning with connecting holes of other structures and then fixing the connecting holes by using bolts.

This fastening structure 15 also can be L shape folded plate, and the minor face fixed connection of this L shape folded plate is on fan casing 10, forms the draw-in groove between the long limit of L shape folded plate and fan casing 10, is provided with the bolted connection hole on the long limit of L shape folded plate, is provided with corresponding connecting plate in other structures, and the connecting plate can block after this recess in, realizes fixed connection through the bolt.

The fan assembly is fixedly assembled with other structures through the installation seam allowance 14 and the fastening structure 15, the structure is simple, the assembly and the disassembly are easy, and the production efficiency can be improved.

Preferably, the fan blades are counter-rotating axial flow fan blades 13. When the counter-rotating axial-flow fan blades 13 are adopted, the number of the motors 12 is two, one motor 12 corresponds to one counter-rotating axial-flow fan blade 13, the two fan blades are arranged in a counter-rotating mode, the reversing of air flow is achieved by adjusting the rotation direction of the motor 12, and the use comfort of a user is improved.

The mounting bracket 11 includes an annular connecting portion 16 and a connecting arm 17 disposed on a peripheral side of the annular connecting portion 16, the connecting arm 17 extends in a radial direction of the annular connecting portion 16, and the motor 12 is fixedly disposed on the annular connecting portion 16. Annular connecting portion 16 can cup joint in the periphery of motor 12, conveniently realizes the fixed setting of motor 12 on installing support 11, and linking arm 17 can increase the connection length of installing support 11 for installing support 11 can conveniently fixed connection on fan housing 10, and then realizes that the installation of motor 12 in fan housing 10 is fixed.

In this embodiment, a connection convex ring 18 is disposed in the middle of the motor 12, and the annular connection portion 16 is sleeved outside the motor 12 and is fixedly connected to the connection convex ring 18. The bottom of the annular connecting portion 16 is provided with a threaded connecting hole or a unthreaded hole, the connecting convex ring 18 is correspondingly provided with a threaded connecting hole or a unthreaded hole, and after the annular connecting portion 16 is aligned with the connecting convex ring 18, the annular connecting portion and the connecting convex ring can be fixedly connected through bolts, so that the motor 12 is fixed on the mounting bracket 11.

The periphery of the mounting bracket 11 is provided with a circumferential flange 19, and the circumferential flange 19 is turned over in a direction away from the annular connecting part 16. The circumference turn-ups 19 of the interior periphery side of installing support 11 is circular, and contacts with the periphery wall of motor 12, can increase the area of contact of motor 12 and installing support 11 in the axial direction, and then improves the stability and the reliability of motor 12 structural setting on installing support 11, guarantees the stability of motor 12 work. By adding the circumferential flanging 19, the structural strength of the mounting bracket 11 can be improved on the whole, and the bearing capacity of the mounting bracket 11 is improved.

The end part of the connecting arm 17 is also provided with an end flanging 20, the end flanging 20 and the circumferential flanging 19 are arranged at intervals, and the end flanging 20 is provided with a connecting hole. The end flanging 20 and the circumferential flanging 19 are arranged at intervals, so that the flanging difficulty of the flanging can be reduced, and the structural design of the flanging is facilitated. The end flange 20 is provided with a connecting hole, so that the connecting arm 17 and the fan shell 10 can be fixedly connected conveniently.

The line groove 21 is formed in the circumferential flanging 19 of the at least one connecting arm 17, the line grooves can be formed by the circumferential flanging 19 of the two sides of the mounting support 11, wiring is convenient, machine lines can be restrained by the line grooves 21, wiring efficiency is further improved, and the passing in and out of the motor lines is more reasonable.

The mounting distance between two blades of the counter-rotating axial flow fan blade 13 is b, the axial length of the fan shell 10 is a, the diameter of the fan blade is d, wherein a/b is more than or equal to 8 and less than or equal to 12, and b/d is more than or equal to 0.3 and less than or equal to 0.6.

By setting the proportional relation between the distance between the two blades of the disrotatory axial flow fan blade 13 and the axial length of the fan shell 10 and the proportional relation between the distance between the two blades of the disrotatory axial flow fan blade 13 and the diameter of the fan blade, the control of the air quantity, the air outlet speed and the noise of the fan assembly part can be effectively ensured, and the working performance of the fan assembly is improved.

The inner peripheral wall of the fan shell 10 is provided with a clamping groove 22, and the connecting arm 17 is clamped in the clamping groove 22 and fixedly connected with the fan shell 10. Keep off the ring in being provided with on fan casing 10's internal perisporium, keep off including and be provided with mated backstop board along circumference interval on the ring, every to the relative setting of backstop board, form draw-in groove 22, in this draw-in groove 22 is gone into to the card of linking arm 17, can form circumference spacing to the installation of installing support 11, conveniently carry out the axial of installing support 11 in fan casing 10 and the installation location of circumference, improve the installation effectiveness, reduce the installation degree of difficulty.

According to the embodiment of the application, the air conditioner comprises the fan assembly, and the fan assembly is the fan assembly. The air conditioner is, for example, a cabinet air conditioner.

The air conditioner also comprises a base 23, a first air opening component 24 and a second air opening component 25 which are sequentially arranged from bottom to top, wherein the fan component is detachably connected between the first air opening component 24 and the second air opening component 25, so that a detachable connection structure can be realized between the fan component and the first air opening component 24 and the second air opening component 25, the replacement and maintenance cost can be reduced, meanwhile, the assembly and the transportation are convenient, and the transportation cost is reduced.

When the motor 12 or the fan blade needs to be disassembled for maintenance, the fan assembly can be directly disassembled from the air conditioner, and then the motor 12 or the fan blade can be disassembled from the fan assembly, so that the disassembling and assembling efficiency is high compared with that of a conventional cabinet machine.

The air conditioner is still including setting up the heat exchanger in first wind gap subassembly 24, is provided with guiding device in the wind channel between heat exchanger and the fan, and guiding device includes water conservancy diversion circle 1 and sets up cowling panel 2 in water conservancy diversion circle 1, and cowling panel 2 extends along the axial of water conservancy diversion circle 1, and the both sides of cowling panel 2 are connected to the inner wall of water conservancy diversion circle 1, and cowling panel 2 is cut apart into two at least rectification regions with the water conservancy diversion passageway of water conservancy diversion circle 1.

The guide ring 1 is positioned between the fan and the heat exchanger and used for guiding the flow of air flow in the internal air channel, on one hand, the air flow flowing through the guide ring 1 is guided and rectified, on the other hand, the air flow flowing through the guide ring 1 can be silenced, the flowing noise of the air flow is reduced, and the flowing efficiency of the air flow is improved. The above-mentioned internal air duct communicates with the first tuyere assembly 24 and the second tuyere assembly 25, respectively.

In this embodiment, the upper edge of the deflector ring 1 extends to the top surface of the base 23, and the lower edge of the deflector ring 1 extends to the end surface of the heat exchanger and corresponds to the inner edge of the heat exchanger.

This guiding device has add cowling panel 2 in water conservancy diversion circle 1, because cowling panel 2 is located water conservancy diversion circle 1 inside, and separate for two at least rectification region through water conservancy diversion circle 1, consequently not only can utilize water conservancy diversion circle 1 itself to carry out the rectification to the air current of water conservancy diversion circle 1 internal circumference side, and also can utilize cowling panel 2 to carry out the rectification to the air current that flows through water conservancy diversion circle 1 and be close to cowling panel 2 region, consequently can carry out the rectification of wider scope and bigger region to the air current that flows through water conservancy diversion circle 1, make the air current homoenergetic of flowing through water conservancy diversion circle 1 effectively rectify, consequently can reduce the air current in the wind channel more greatly and the flow loss that causes in disorder flow, improve the air current flow efficiency, improve the water conservancy diversion effect of water conservancy diversion circle.

The extension line of cowling panel 2 along the axial is the straight line, can guarantee that cowling panel 2 can not take place the bending along the in-process that the axial direction extends, consequently can play more effective rectification effect for the air current homoenergetic that gets into in the water conservancy diversion circle 1 can form regular straight line air current under cowling panel 2's rectification effect, reduces the air current more effectively and flows the produced flow loss of in-process in the wind channel.

The rectifying plate 2 is a straight plate or an arc-shaped plate. In this embodiment, the rectifying plate 2 is a straight plate or an arc-shaped plate, specifically, on the basis that an extension line of the rectifying plate along the axial direction is a straight line, in a cross section perpendicular to the extension line, the rectifying plate is a straight line or an arc line. The rectifying plate formed under the condition can play a linear rectifying role on the airflow in the flowing direction of the airflow regardless of being an arc plate or a straight plate, and both the arc plate and the straight plate can play a good rectifying effect and reduce the flowing resistance of the airflow.

Preferably, there are a plurality of fairing plates 2, and a plurality of fairing plates 2 are parallel or intersect in the baffle 1. The plurality of rectifying plates 2 can divide the internal flow passage of the flow guiding ring 1 into more rectifying areas, so that the flow of gas flowing through each rectifying area is limited, the rectifying plates 2 on the peripheral side of each area have a more obvious rectifying effect on the gas flowing through the area, the gas flow in the center and the peripheral side of the flow guiding ring 1 can be effectively rectified, and a better rectifying effect is achieved.

Preferably, the fairing 2 includes at least two straight plates, wherein two straight plates intersect perpendicularly, and the intersection line is located the central axis of water conservancy diversion circle 1, can guarantee to be located the most central region the air current of being difficult to be rectified by the internal perisporium of water conservancy diversion circle 1, also can be rectified by straight platelike fairing 2 to each region of the water conservancy diversion passageway of water conservancy diversion circle 1 has all been guaranteed to effectively rectify, further improves rectification effect.

In this embodiment, the cowling panels 2 are a plurality of, and a plurality of cowling panels 2 divide into two sets ofly, and each cowling panel 2 in the first group cowling panel 2 is parallel to each other, and each cowling panel 2 in the second group cowling panel 2 is parallel to each other, and first group cowling panel 2 is perpendicular to second group cowling panel 2.

In this embodiment, each group of rectifying plates 2 includes three rectifying plates 2, six rectifying plates 2 in total cooperate with the flow guide ring 1, the flow guide channel of the flow guide ring 1 is divided into 16 rectifying regions, when the fan blows out a rotating and irregular airflow, the airflow flows through the 16 rectifying regions under the guidance of the flow guide ring 1, a regular linear airflow is formed, the effect of a gas rectifier is achieved, and the flow loss caused by the disordered flow of the airflow in the air duct is reduced.

Preferably, the inner peripheral wall of the deflector ring 1 is provided with a first muffling hole 3. Through set up the amortization hole on water conservancy diversion circle 1, can utilize the amortization hole on the water conservancy diversion circle 1 to carry out the amortization to the air current that flows through water conservancy diversion circle 1 to reduce the aerodynamic noise of the air current that flows through water conservancy diversion circle 1.

Preferably, the aperture of the first muffling hole 3 is 0.5-1.5 mm, and in the cross section perpendicular to the central axis, the distance between adjacent first muffling holes 3 is 6mm, so that a microporous muffling cylinder can be formed, which has the muffling characteristics of wide frequency band, small volume and high efficiency, and the aperture size is selected, so that the processing is convenient and the blockage is not easy to occur during the use.

The flow guide ring 1 comprises a first inner cylinder 4 and a first outer cylinder 5, the first inner cylinder 4 is located on the inner peripheral side of the first outer cylinder 5, and a first silencing hole 3 is formed in the first inner cylinder 4. A silencing cavity communicated with the first silencing hole 3 is formed between the first inner cylinder 4 and the first outer cylinder 5, and the silencing cavity can be used for further enhancing the noise reduction effect of the flow guide ring 1.

Preferably, a transverse baffle 8 is further arranged between the first inner cylinder 4 and the first outer cylinder 5, the transverse baffle 8 is arranged along the circumferential direction of the deflector ring 1, and the cavity surrounded by the first inner cylinder 4 and the first outer cylinder 5 is axially divided into at least two parts. Through setting up horizontal baffle 8, can prevent effectively that the sound wave propagation along the axial direction of pipe from taking place in the cavity between first inner tube 4 and the first urceolus 5, further improve amortization noise reduction effect.

Preferably, the thickness of the transverse baffle 8 is 3 mm.

A second inner cylinder 6 is arranged between the first inner cylinder 4 and the first outer cylinder 5, and a first silencing hole 3 is arranged on the second inner cylinder 6.

A second outer cylinder 7 is arranged between the second inner cylinder 6 and the first outer cylinder 5, and a first silencing hole 3 is arranged on the second outer cylinder 7. Through increasing second inner tube 6 and the outer section of thick bamboo 7 of second, and all set up the first bloop 3 that link up on second inner tube 6 and the outer section of thick bamboo 7 of second, can form the multilayer perforating section of thick bamboo to form multilayer amortization noise reduction structure on the section of thick bamboo wall of water conservancy diversion circle 1, play better amortization noise reduction effect.

Preferably, the thickness of the second inner cylinder 6 is greater than the thickness of the second outer cylinder 7. Specifically, in this embodiment, the thickness of the second inner cylinder 6 is 4mm, and the thickness of the second outer cylinder 7 is 2mm, so that the occupation of the cylinder body on the space of the cylinder wall of the flow guiding ring 1 can be reduced, a sound-deadening chamber can be formed more effectively, and the sound-deadening effect can be improved.

In this embodiment, the thickness of the second outer cylinder 7 is smaller than that of the second inner cylinder 6, because the second inner cylinder 6 is closer to the airflow, the effect of the vibration generated when the airflow flows on the second inner cylinder 6 is larger, and if the thickness of the second inner cylinder 6 is too small, the second inner cylinder 6 vibrates along with the airflow, so that the vibration and noise reduction effect of the second inner cylinder 6 on the airflow is reduced.

Preferably, the rectifying plate 2 is provided with a second muffling hole 9.

The rectifying plate 2 is made of sound-absorbing material.

When the airflow flows through the rectifying plate 2, the rectifying plate 2 can not only perform the rectifying function on the airflow, but also perform the silencing function, thereby reducing the airflow flowing loss and the airflow flowing noise.

When the inner wall of the flow guide ring 1 and the rectifying plate 2 are both provided with the silencing holes, the two are combined for silencing, so that the pneumatic noise and the air cavity resonance sound can be greatly reduced.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.