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Title:
SILENCER FOR A HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/058350
Kind Code:
A1
Abstract:
The present application discloses a silencer for a heating, ventilation, and air conditioning system comprising a silencing channel having an outlet and an inlet, such that airflow flows in from the inlet and flows out from the outlet, and a check valve disposed in the silencing channel. The check valve has a bivalve butterfly structure, such that airflow in the silencing channel flows unidirectionally to the outlet after flowing through the check valve from the inlet, instead of flowing from the outlet to the inlet after flowing through the check valve. The present application also discloses a compressor, wherein at least a portion of the exhaust channel of the compressor is constructed as the aforementioned silencing channel and in which a check valve having a bivalve butterfly structure is disposed.

Inventors:
DING, Xiaofeng (No. 32, Changjiang Road High-Tech. Industrial Development Zon, Wuxi Jiangsu 8, 214028, CN)
YANG, Shengmei (No. 32, Changjiang Road High-Tech. Industrial Development Zon, Wuxi Jiangsu 8, 214028, CN)
CHEN, Jing (No. 32, Changjiang Road High-Tech. Industrial Development Zon, Wuxi Jiangsu 8, 214028, CN)
ZHANG, Fengzhi (No. 32, Changjiang Road High-Tech. Industrial Development Zon, Wuxi Jiangsu 8, 214028, CN)
Application Number:
IB2018/057382
Publication Date:
March 28, 2019
Filing Date:
September 25, 2018
Export Citation:
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Assignee:
YORK (WUXI) AIR CONDITIONING AND REFRIGERATION CO., LTD. (No. 32, Changjiang Road High-Tech. Industrial Development Zon, Wuxi Jiangsu 8, 214028, CN)
JOHNSON CONTROLS TECHNOLOGY COMPANY (2875 High Meadow Circle, Auburn Hills, Michigan, 48326-2773, US)
International Classes:
F24F13/14; F01N1/16; F24F13/24
Domestic Patent References:
WO2003073016A12003-09-04
Foreign References:
FR2876434A12006-04-14
CN201507336U2010-06-16
CN205047275U2016-02-24
CN202403466U2012-08-29
US20120180465A12012-07-19
KR20010059259A2001-07-06
DE102012205984A12013-10-17
DE19849863A11999-05-06
DE19701358A11998-07-23
Other References:
None
Attorney, Agent or Firm:
TUO YING LAW OFFICES (SHANGHAI) (Suite 306, Modern Universe Business PlazaNo.99 Huichuan Road, Changning Distric, Shanghai Shanghai 0, 200050, CN)
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Claims:
1. A silencer (100) for a heating, ventilation, and air conditioning system, comprising:

a silencing channel (110), wherein the silencing channel (110) includes an outlet (106) and an inlet (104) to allow airflow (116) to flow in from the inlet (104) and flow out of the outlet (106); and

a check valve (120), wherein the check valve (120) is disposed in the silencing channel (110), and the check valve (120) is a bivalve butterfly structure, such that airflow (116) in the silencing channel (110) flows unidirectionally to the outlet (106) after flowing through the check valve (120) from the inlet (104), instead of flowing from the outlet (106) to the inlet (104) after flowing through the check valve (120).

2. The silencer (100) of claim 1, wherein the bivalve butterfly structure of the check valve (120) comprises a shaft (202) and two semi-circular butterfly fins (122, 124),

wherein the two semi-circular butterfly fins (122, 124) are radially and symmetrically disposed on the shaft (202) with respect to the shaft (202), and both ends of the shaft (202) are fixed on a wall (119) of the silencing channel (110), and

wherein a torsion spring (204) is disposed on the shaft (202), the torsion spring (204) is configured to be pre-stressed, and the pre-stress causes the two semi-circular butterfly fins (122, 124) to abut against a surface (150) of the silencing channel (110).

3. The silencer (100) of claim 2, wherein, when the airflow (116) flows from the inlet (104) of the silencing channel (110) to the check valve (120) and the airflow (116) has a pressure difference on opposite sides of the check valve (120) that is larger than the pre-stress of the torsion spring (204), the check valve (120) is configured to be opened so that the airflow (116) flows from the inlet (104) of the silencing channel (110) to the outlet (106), and

wherein, when the airflow (116) flows from the outlet (106) of the silencing channel (110) toward the inlet (104) of the silencing channel (110) or when the airflow (116) has a pressure difference on opposite sides of the check valve (120) that is smaller than the pre-stress of the torsion spring (204), the check valve (120) is configured to remain closed, and the airflow (116) cannot flow from the inlet (104) or the outlet (106) of the silencing channel (110) through the check valve (120) to the inlet (104) or the outlet (106) of the silencing channel (110).

4. The silencer (100) of claim 3, wherein a diameter of the inlet (104) of the silencing channel (110) and/or a diameter of the outlet (106) is/are smaller than a diameter of a portion (112) between the inlet (104) and the outlet (106) of the silencing channel (110), and

wherein a support structure (108) is provided between the inlet (104) and the outlet (106) of the silencing channel (110), and a cavity (118) between the inlet (104) and the support structure (108) and between the outlet (106) and the support structure (108) is configured to reduce noise of the airflow (116).

5. The silencer (100) of claim 4, wherein: an inner tube (114) is disposed in a middle of the support structure (108), and

the check valve (120) is disposed at a front end (123) or a rear end (121) of the inner tube (114).

6. The silencer (100) of claim 1, wherein:

an inner wall (434) between the inlet (104) and the outlet (106) of the silencing channel (110) is provided with a sound-absorbing material (433), and the sound-absorbing material (433) forms a sound-absorbing material channel for reducing noise of the airflow (116).

7. The silencer (100) of claim 1, wherein:

an inner wall (434) of the silencing channel (110) is provided with a sound-absorbing material (433); and

the check valve (120) is disposed at the inlet (104) of the silencing channel (110), at the outlet (104) of the silencing channel (110), or at any position between the inlet (104) and the outlet (106) of the silencing channel (110).

8. The silencer (100) of claim 7, wherein:

the inlet (304) and the outlet (306) of the silencing channel (310), and a portion (312) between the inlet (304) and the outlet (306) of the silencing channel (310) have the same inner diameter.

9. A compressor (500), comprising: an exhaust channel (540); and

a check valve (120);

wherein at least a portion of the exhaust channel (540) is provided as a silencing channel (510), wherein the silencing channel (510) includes an outlet (507) and an inlet (504), such that airflow (535) flows in from the inlet (504) and flows out from the outlet (507); and

wherein the check valve (120) is disposed in the silencing channel (510), the check valve (120) comprises a bivalve butterfly structure, such that the airflow (535) in the silencing channel (510) flows unidirectionally to the outlet (507) after flowing through the check valve (120) from the inlet (504), instead of flowing from the outlet (507) to the inlet (504) after flowing through the check valve (120).

10. The compressor (500) of claim 9, wherein:

the bivalve butterfly structure of the check valve (120) comprises a shaft (202) and two semi-circular butterfly fins (122, 124),

wherein the two semi-circular butterfly fins (122, 124) are radially and symmetrically disposed on the shaft (202) with respect to the shaft (202), and both ends of the shaft (202) are fixed on a wall (119) of the silencing channel (510), wherein a torsion spring (204) is disposed on the shaft (202), the torsion spring (204) is configured to be pre-stressed, and the pre-stress causes the two semi-circular butterfly fins (122, 124) to abut against a surface (150) of the silencing channel (510).

Description:
Silencer for a Heating, Ventilation, and Air Conditioning System Technical Field

The present application relates to components within an air conditioning unit, and in particular to a silencer and check valve apparatus for an air conditioning unit.

Background Art

Silencers (also known as mufflers) and check valves are commonly used in the suction and exhaust pipelines of air conditioning units. The function of a silencer is to reduce the noise of airflows in the suction and exhaust pipelines. The purpose of a check valve is to prevent compressor reversal caused by backlash of airflow during shutdown. Generally, a silencer and a check valve are mounted as two separate parts on suction and exhaust pipelines. This arrangement increases the complexity of pipeline installation. In some applications, a silencer and a check valve may be combined into one part. However, existing, integrated silencer check valves have disadvantages, including a complicated structure, a large pressure drop, susceptibility to valve jamming, and poor silencing effect.

Summary of the Disclosure

An objective of the present application is to solve at least the above-mentioned technical problems. According to a first aspect of the present application, a silencer includes a silencing channel having an outlet and an inlet to allow airflow to flow in from the inlet and out from the outlet, and a check valve disposed in the silencing channel, wherein the check valve has a bivalve butterfly structure, such that airflow in the silencing channel flows unidirectionally to the outlet after flowing through the check valve from the inlet, instead of flowing from the outlet to the inlet after flowing through the check valve.

According to present embodiments, the bivalve butterfly structure of the check valve comprises a shaft and two semi-circular butterfly fins, wherein the two semi-circular butterfly fins are radially and symmetrically disposed on the shaft with respect to the shaft, and both ends of the shaft are fixed on a wall of the silencing channel. The bivalve butterfly structure of the check valve also includes a torsion spring disposed on the shaft, wherein the torsion spring is configured to be pre-stressed, and the pre-stress causes the two semi-circular butterfly fins to abut against a surface of the silencing channel.

According to present embodiments, when the airflow flows from the inlet of the silencing channel to the check valve, and the airflow has a pressure difference on both sides of the check valve that is larger than the pre-stress of the torsion spring, the check valve is configured to be opened so that the airflow flows from the inlet of the silencing channel to the outlet. When the airflow flows from the outlet of the silencing channel toward the inlet of the silencing channel, or when the airflow has a pressure difference on both sides of the check valve that is smaller than the pre-stress of the torsion spring, the check valve is configured to remain closed, and the airflow cannot flow from the inlet or outlet of the silencing channel through the check valve to the inlet or outlet of the silencing channel.

According to present embodiments, a diameter of the inlet of the silencing channel and/or a diameter of the outlet is/are smaller than a diameter of a portion of the silencing channel between the inlet and the outlet of the silencing channel. A support structure is provided between the inlet and the outlet of the silencing channel, and a cavity between the inlet and the support structure and between the outlet and the support structure is configured to reduce noise of the airflow.

According to present embodiments, an inner tube is disposed in the middle of the support structure, and the check valve may be disposed at a front end or a rear end of the inner tube.

According to present embodiments, an inner wall of the inlet is provided with a sound-absorbing material, and the sound-absorbing material forms a sound-absorbing material channel for reducing noise of the airflow.

According to present embodiments, an inner wall of the silencing channel is provided with a sound-absorbing material, the silencing channel has an inlet and an outlet, and the check valve is disposed at the inlet of the silencing channel, the outlet of the silencing channel, or at any position between the inlet and the outlet of the silencing channel.

According to present embodiments, the inlet of the silencing channel, the outlet of the silencing channel, and a portion between the inlet and the outlet of the silencing channel have the same diameter.

According to another aspect of the present application, a compressor includes an exhaust channel and a check valve, wherein at least a portion of the exhaust channel is provided as a silencing channel having an outlet and an inlet, such that airflow flows in from the inlet and flows out from the outlet, and the check valve is disposed in the silencing channel. The check valve may be a bivalve butterfly structure, such that airflow in the silencing channel flows unidirectionally to the outlet after flowing through the check valve from the inlet, instead of flowing from the outlet to the inlet after flowing through the check valve.

According to present embodiments, the bivalve butterfly structure of the check valve comprises a shaft and two semi-circular butterfly fins, wherein the two semi-circular butterfly fins are radially and symmetrically disposed on the shaft with respect to the shaft, and both ends of the shaft are fixed on a wall of the silencing channel. A torsion spring is disposed on the shaft, wherein the torsion spring is configured to be pre-stressed, and the pre-stress causes the two semi-circular butterfly fins to abut against a surface of the silencing channel.

According to present embodiments, a check valve is designed as a bivalve butterfly structure and can be applied in combination in relevant positions of an existing silencer, pipeline, or compressor exhaust channel. Compared with conventional embodiments and prior art, presently disclosed embodiments including a structure that is simpler and more compact, has a small pressure drop, is capable of improving the silencing effect of the silencer, and improves spool reliability.

Brief Description of the Drawings

Figure 1A is a schematic structural view of an embodiment of a silencer of the present application, wherein a check valve is disposed at a rear end of an inner tube of the silencer;

Figure IB is a schematic structural view of the check valve of Figure 1A in an opened position;

Figure 1C is a schematic structural view of another embodiment of the same type of silencer of Figure 1A, wherein the check valve is disposed at an inlet of a silencing channel of the silencer;

Figure ID is a schematic structural view of another embodiment of the same type of silencer of Figure 1A, wherein the check valve is disposed at an outlet of the silencing channel;

Figure IE is a schematic structural view of another embodiment of the same type of silencer of Figure 1A, wherein the check valve is disposed at a front end of the inner tube of the silencer;

Figure 2 is a perspective view of a check valve of the present application disposed at a rear end of the inner tube shown in Figure 1 A;

Figure 3 is a schematic structural view of an embodiment of another type of the silencer of the present application;

Figure 4 is a schematic structural view of an embodiment of a silencer of the present application, including a sound-absorbing material in the silencer shown in Figure 1A;

Figure 5A is a schematic structural view of an embodiment of a compressor provided with a silencer of the present application, wherein at least a portion of an exhaust channel of the compressor is configured as a silencing channel;

Figure 5B is an enlarged view illustrating the compressor structure of area B of Figure 5 A.

Detailed Description

Various specific embodiments of the present application will be described below with reference to the drawings which form a part of this Specification. It should be understood that although the terms referring to directions, such as "front", "back", "upper", "lower", "left", "right", etc., are used in this application to describe various example structural parts and elements of the present application, these terms are used herein for convenience of description only, determined on the basis of the example orientations shown in the figures. Since the embodiments disclosed herein may be arranged in different orientations, these terms are merely illustrative and are not to be considered as limiting.

Figures 1A to IE show four embodiments of one type of silencer according to the present application. In these four embodiments, the check valves are disposed at different positions within the silencer. In particular, Figures 1A and IB show two states of the check valve in the same embodiment of a silencer, and Figures 1C to IE show three other embodiments with check valves at different positions within a silencer, respectively.

The silencer shown in Figures 1 A to IE is a reactive silencer, and its working principle is to generate reflection and interference of acoustic energy by a change in impedance during the sound propagation caused by a sudden change in the cross-sectional area of the gas pipeline. In this manner, outward radiation of sound energy from the silencer is reduced to achieve the purpose of silencing or reducing noise of the airflow.

In the embodiment shown in Figures 1A and IB, a check valve is disposed at a rear end of an inner tube of the silencer. As shown in Figure 1A, a silencer 100 comprises a silencing channel 110. The silencing channel 110 comprises an inlet 104 and an outlet 106. According to one embodiment of the present application, the silencing channel 110 is formed by a tubular component 102, wherein the tubular member 102 may be, for example, part of a suction and/or exhaust pipeline of an air conditioning unit. Certainly, the silencing channel 110 can also be formed by a component that is not tubular. In the present embodiment, the respective inner diameters (or cross sections) of the inlet 104 and the outlet 106 of the silencing channel 110 are smaller than the inner diameter (or cross section) of a portion 112 of the silencing channel 110 between the inlet 104 and the outlet 106 of the silencing channel 110. As a result, when an airflow 116 flows into or out of the silencing channel 110, attenuation of sound energy of the airflow 116 occurs to achieve the purpose of silencing or reducing noise of the airflow 116. However, the respective inner diameters of the inlet 104 and the outlet 106 may even be larger than the inner diameter of the portion 112 of the silencing channel 110 between the inlet 104 and the outlet 106, depending on the amount of noise reduction and acceptable pressure loss of the system having the silencer 100. The inlet 104 and the outlet 106 may be in communication with a gas channel of an air conditioner. A gas, such as the airflow 116, may enter the silencing channel 110 via the inlet 104 and may flow out of the silencing channel 110 via the outlet 106. After the gas passes through the silencing channel 110, a change in impedance is generated to reduce the sound energy of the gas (e.g., airflow 116).

As shown in Figure 1A, a support structure 108 is further disposed laterally inside the silencing channel 110, and an inner tube 114 is disposed in the middle of the support structure 108. The support structure 108 divides a cavity 118 of the silencing channel 110 between the inlet 104 and the outlet 106 into a left portion and a right portion. That is, a left chamber 133 and a right chamber 135 of the cavity 118 are separated by the support structure 108 so that gas in the left chamber 133 passes through the inner tube 114 to reach the right chamber 135. Before and after the gas passes through the inner tube 114, turbulence may occur twice, e.g., in the left chamber 133 and in the right chamber 135 of the silencing channel 110, thereby achieving a better silencing effect.

The silencer 100 further comprises a check valve 120 disposed inside the silencing channel 110. The check valve 120 may be a bivalve butterfly structure comprising a shaft 202 (Figure 2) and two semi-circular butterfly fins 122, 124. Figure 2 illustrates an embodiment of the check valve 120 in further detail. The two semi-circular butterfly fins 122, 124 are radially and symmetrically disposed on the shaft 202 with respect to the shaft 202. Both ends of the shaft 202 are fixed on a wall 119 (e.g., an inner wall) of the inner tube 114 or silencing channel 110. The two semi-circular butterfly fins 122, 124 are unidirectionally biased or closed by the torsion of torsion spring 204.

In the embodiment shown in Figure 1A, the check valve 120 is disposed at a rear end 121 (or downstream end) of the inner tube 114. When the pressure of gas (e.g., airflow 116) flowing from upstream of the inlet 104 into the silencing channel 110 and entering the check valve 120 is greater than the pressure of gas downstream of the check valve 120, and the pressure difference between the two is greater than the torsion of the torsion spring 204 of the check valve 120, the two semi-circular butterfly fins 122, 124 of the check valve 120 are pushed open, and the gas can flow through the check valve 120. On the contrary, if gas flows in from the outlet 106 of the check valve 120, or if the gas pressure difference across the two semi-circular butterfly fins 122, 124 of the check valve 120 is less than the torsion of the torsion spring 204, then the two semi-circular butterfly fins 122, 124 of the check valve 120 remain closed under the action of the torsion spring 204. The state shown in Figure 1A is a state in which the check valve 120 is in a closed position. Figure IB shows a state when the check valve 120 shown in Figure 1 A is in an opened position. As shown in Figure IB, when the check valve 120 is in an open state, the two semi-circular butterfly fins 122, 124 of the check valve 120 are opened, and a gas can flow through the check valve 120 into the downstream right chamber 135 and through the outlet 106.

As can be seen from the illustrated embodiment, when the gas (e.g., airflow 116) flows through the check valve 120, the airflow 116 is split into two streams, due to the bivalve butterfly structure of the check valve 120, that respectively enter the downstream right chamber 135. The shunting of the gas can generate more turbulence and enhance the silencing effect of the silencing channel 110.

In fact, the check valve 120 of the present application can be disposed at a plurality of positions of the silencer 100, particularly by arranging the check valve 120 at different positions in the silencing channel 110. For example, in the embodiment shown in Figure 1C, the check valve 120 is disposed at the inlet 104 of the silencing channel 110. In the embodiment shown in Figure ID, the check valve 120 is disposed at the outlet 106 of the silencing channel 110. In the embodiment shown in Figure IE, the check valve 120 is disposed at a front end 123 (or upstream end) of the inner tube 114. These embodiments are similar to the embodiment shown in Figure 1A, except that the position of the check valve 120 is different, and details are not described herein. In addition to the various mounting positions of the check valve 120 shown in Figures 1A to IE, the check valve 120 can be disposed at other locations of the silencing channel 110 and/or inner tube 114, all of which are within the scope of the present application. Figure 2 is a perspective structural view of an embodiment of the check valve 120 of the present application when the check valve 120 is disposed at the rear end 121 of the inner tube 114 shown in Figure 1A. Figure 2 illustrates a specific structure of the check valve 120.

As shown in Figure 2, as an example, the rear end 121 of the inner tube 114 has two lugs 223 and 225 which are outwardly formed and are symmetrically arranged with respect to the axis of the inner tube 114. Both ends of the shaft 202 are respectively fixed to the inner walls of the lugs 223 and 225. Two semi-circular butterfly fins 122, 124 are rotatably coupled to the shaft 202, such that the two semi-circular butterfly fins 122, 124 form a butterfly wing arrangement relative to the shaft 202. A torsion spring 204 is disposed on the shaft 202. The torsion spring 204 is configured to be pre-stressed, and the pre-stress causes the two semi-circular butterfly fins 122, 124 to abut against an end 150 (e.g., a wall or surface) of the inner tube 114 so that the check valve 120 can close against the inner tube 114. The two semi-circular butterfly fins 122, 124 of the check valve 120 shown in Figure 2 are in an open state.

Whether the two semi-circular butterfly fins 122, 124 of the check valve 120 are opened depends on whether the pressure difference between an upstream side 152 and a downstream side 154 of the two semi-circular butterfly fins 122, 124 of the check valve 120 and/or of the inner tube 114 is greater than the pre-stress of the torsion spring 204.

When the airflow 116 flows from the upstream side 152 of the inner tube 114 through the check valve 120, the gas pressure upstream of the two semi-circular butterfly fins 122, 124 may be greater than the gas pressure downstream thereof, and the pressure difference may be greater than the pre-stress of the torsion spring 204. In such circumstances, the two semi-circular butterfly fins 122, 124 of the check valve 120 are pushed open by the upstream gas or airflow 116. Conversely, when airflow 116 flows from the downstream side 154 of the inner tube 114 to the upstream side 152 of the inner tube 114, or when the pressure difference between the two sides 152, 154 of the semi-circular butterfly fins 122, 124 (e.g., greater upstream side 152 pressure than downstream side 154 pressure) is smaller than the pre-stress of the torsion spring 204, the check valve 120 cannot be opened. This is how the check valve 120 works in unidirectional passage.

Figure 3 shows an embodiment of another type of silencer, according to the present application.

A silencer 300 shown in Figure 3 is a dissipative silencer, which is different from the reactive silencer shown in Figure 1A. In a dissipative silencer, sound waves propagate in a porous sound-absorbing material, and sound energy is converted into heat and is dissipated due to friction, thereby achieving the purpose of silencing. The silencing function of a dissipative silencer relies on the sound-absorbing material in the silencing channel of the silencer. As shown in Figure 3, the silencer 300 is provided with a silencing channel 310, where the silencing channel 310 has an inlet 304 and an outlet 306, and the inlet 304 and the outlet 306 are connected to a system having a gas channel, such as an air conditioner. According to one embodiment of the present application, the silencing channel 310 is formed by a tubular component 302. Certainly, the silencing channel 310 can also be formed by a component that is not tubular. In the illustrated embodiment, the respective inner diameters (or cross sections) of the inlet 304 and the outlet 306 of the silencing channel 310 are the same as the inner diameter (or cross section) of a portion 312 between the inlet 304 and the outlet 306 of the silencing channel 310. A sound-absorbing material 320 is disposed on an inner wall 314 of the silencing channel 310, and the sound-absorbing material 320 mainly functions to absorb sound energy.

The check valve 120 can be disposed at the inlet 304, the outlet 306, or any location between the inlet 304 and the outlet 306. As an embodiment, the check valve 120 shown in Figure 3 is disposed adjacent to the outlet 306. The principle and method of opening and closing the check valve 120 are the same as those of the foregoing embodiments, and thus are not described again herein.

Figure 4 shows an embodiment of another type of silencer according to the present application. In the illustrated embodiment, the silencer includes a sound-absorbing material disposed inside the silencing channel of a silencer similar to that shown in Figure 1A.

In particular, Figure 4 illustrates a silencer 430 that is a reactive/dissipative composite silencer. Such a composite silencer, which combines the reactive silencer shown in Figure 1 A with the dissipative silencer shown in Figure 3, utilizes features of the reactive silencer to reduce the sound energy through a change in the inner diameter of the silencing channel and also utilizes features of the dissipative silencer to absorb sound energy with a sound-absorbing material. Specifically, the silencer 430 is formed by adding a sound-absorbing material 433 similar to that of the silencer 300 shown in Figure 3 to an inner wall 434 of the silencing channel 110 of the silencer 100 shown in Figure 1A. This allows the silencer 430 to have dual silencing characteristics, including the respective silencing characteristics of the silencer 100 of Figure 1A and the silencer 300 of Figure 3, thereby achieving a better silencing effect.

The check valve 120 in the silencer 430 is mounted in the same manner as the silencer 100, but may be disposed at any of a plurality of positions of the silencer 430, such as any of the plurality of positions shown in Figures 1C, ID, and IE. The mounting structure and working principle of the silencer 430 are also the same as those of Figure 1A, Figure 1C, Figure ID and Figure IE, and thus are not described again herein.

Figure 5A is a schematic structural view of an embodiment of a compressor provided with a silencer of the present application, wherein at least a portion of an exhaust channel of the compressor is configured as a silencing channel. Figure 5B is an enlarged view illustrating the structure of area B in Figure 5A.

As shown in Figures 5A and 5B, a compressor 500, such as an air conditioning compressor, is provided with a housing 532, a cavity 534 disposed within the housing 532, where the cavity 534 is provided with a gas inlet 531 and an exhaust channel 540. One, two, or more rotors 536 are disposed within the cavity 534. The rotor(s) 536 is rotated by a motor (not shown), and a gas 535 is sucked through the gas inlet 531 of the cavity 534. The gas 535 is compressed and then discharged from the exhaust channel 540. In the present application, at least one portion of the exhaust channel 540 is configured as a silencing channel 510, and a check valve 120 is disposed therein to form a silencer 550, such that the gas 535 can be silenced as it flows through the silencer 550. The specific structure of the silencer 550 is shown in Figure 5B.

As shown in Figure 5B, a portion of the exhaust channel 540 with a larger inner diameter 542 forms the silencing channel 510, and the silencing channel 510 is provided with an outlet 507 and an inlet 504, such that airflow (e.g., the gas 535) flows in from the inlet 504 and out of the outlet 507. The inner diameter 542 of a remaining portion 544 of the silencing channel 510 is larger than respective inner diameters of the outlet 507 and the inlet 504 so that sound energy is attenuated when airflow flows into and out of the silencing channel 510, thereby achieving the purpose of silencing. A support structure 508 is disposed in the silencing channel 510, an inner tube 516 is disposed in the middle of the support structure 508, and the check valve 120 is disposed at a rear end 520 of the inner tube 516. The check valve 120 may be a bivalve butterfly structure, such that airflow (e.g., gas 535) enters the silencing channel 510 through the inlet 504 and flows to the outlet 507 after flowing through the check valve 120 unidirectionally, instead of flowing into the inlet 504 after flowing through the check valve 120 from the outlet 507, thereby achieving the effect of unidirectional airflow passage.

Similarly, the bivalve butterfly structure of the check valve 120 shown in Figures 5 A and 5B is arranged in the same manner as that in Figure 1A. Likewise, the check valve 120 shown in Figures 5 A and 5B, similar to that in Figures 1C to IE, can also be disposed at different locations within the silencing channel 510.

In the illustrated embodiment, at least a portion of the exhaust channel 540 of the air conditioning compressor 500 is constructed as a silencing channel, and a check valve according to the present application is installed in the silencing channel so that the silencer is integrated inside the compressor 500. In this manner, the functions of checking airflow with a low pressure drop and silencing airflow can be simultaneously achieved, while saving internal space of an appliance having the compressor 500, thereby achieving high integration and high reliability.

While the present application has been described with reference to the embodiments illustrated in the drawings, it is understood that a silencer according to the present application can have many variations without departing from the spirit and scope of the present disclosure. Further, it will be appreciated by those of ordinary skill in the art that various methods of changing the parameters in the embodiments disclosed in the present application fall within the spirit and scope of the present application and claims.