Silencing device of compressor

Abstract

The embodiment of the utility model provides a silencer of a compressor. The silencing device comprises a silencer and a check valve. The silencer comprises a shell and a silencing assembly, the shell is provided with a first connecting end, the first connecting end is provided with a first opening structure communicated with an inner cavity of the shell, the silencing assembly is arranged in the inner cavity, and the exhaust end of the silencing assembly extends to the first opening structure. The check valve comprises a valve body and a valve element assembly arranged in the valve body, the valve body is provided with a second connecting end, a first air inlet is formed in the middle of the second connecting end, the second connecting end is connected with the first connecting end, the second connecting end blocks the first opening structure, and the exhaust end of the silencing assembly is connected with the first air inlet. In this way, the silencer and the check valve are connected through a simple and compact connecting structure, and miniaturization and light weight of the silencer of the compressor can be achieved.

Description

Technical Field

[0001] The exemplary embodiments of the present application generally relate to the technical field of compressors, and particularly to a silencing device for a compressor. Background Art

[0002] A silencer and a check valve are usually provided on the exhaust pipeline of a compressor. The exhaust noise is reduced by the silencer, and the gas backflow is prevented by the check valve. The silencer used in the high-pressure exhaust pipeline usually adopts a horn-shaped structure, and the check valve is usually installed at the connection between the high-pressure exhaust pipeline and the cooler. This not only results in a relatively large size of the silencer itself, but also a complex connection structure between the silencer and the check valve, and a relatively large overall structural size. Summary of the Utility Model

[0003] The purpose of the present application is to provide a silencing device for a compressor to solve or at least partially solve the above problems and / or other potential problems existing in the traditional silencer and check valve.

[0004] The present application provides a silencing device for a compressor. The silencing device for the compressor includes: a silencer, including a housing and a silencing component, the housing has a first connection end, the first connection end is provided with a first opening structure communicating with the inner cavity of the housing, the silencing component is arranged in the inner cavity and the exhaust end of the silencing component extends to the first opening structure; a check valve, including a valve body and a valve core component arranged in the valve body, the valve body has a second connection end, the second connection end is provided with a first air inlet, the second connection end is connected to the first connection end, and the second connection end blocks the first opening structure, and the exhaust end of the silencing component is connected to the first air inlet.

[0005] In some embodiments, the exhaust end of the silencing component protrudes with a first cylindrical structure for exhausting; the second connection end is provided with a first annular groove surrounding the first air inlet, and the first cylindrical structure extends into the first annular groove and is hermetically connected to the first annular groove.

[0006] In some embodiments, the silencing component includes a gas guide cylinder with mesh holes opened on the cylinder wall and a silencing structure body wrapped around the outer peripheral side of the gas guide cylinder, and one end of the gas guide cylinder protrudes from the silencing structure body to form the first cylindrical structure.

[0007] In some embodiments, the inner peripheral wall of the first annular groove is provided with a first sealing ring; the outer peripheral surface of the first cylindrical structure contacts the first sealing ring to form a sealed connection.

[0008] In some embodiments, the end of the first cylindrical structure abuts against the stepped portion of the first annular groove to limit the movement of the silencing component towards the check valve.

[0009] In some embodiments, the valve cavity of the valve body extends to the second connection end to form a second opening structure. A baffle ring for blocking the second opening structure is provided at the second connection end. A first air inlet is provided in the middle of the baffle ring, and a first annular groove is provided on the side of the baffle ring facing the silencing component.

[0010] In some embodiments, a second annular groove surrounding the second opening structure and communicating with the second opening structure is provided at the second connection end, and at least a part of the baffle ring is embedded in the second annular groove.

[0011] In some embodiments, a sealing surface surrounding the first air inlet is provided on the side of the baffle ring facing away from the silencing component, and the valve core assembly can contact the sealing surface to block the first air inlet.

[0012] In some embodiments, the valve core assembly includes a mushroom-shaped valve core and a reset elastic member. The valve core is movably connected in the valve cavity of the valve body; the reset elastic member is connected to the valve core and is used to apply a reset elastic force to the valve core.

[0013] In some embodiments, a support portion is provided in the middle of the valve cavity. A guide hole is provided in the middle of the support portion. A guide rod is provided on the side of the valve core facing away from the first air inlet, and the guide rod is movably connected in the guide hole.

[0014] In some embodiments, the support portion is connected to the inner wall of the valve cavity through a plurality of connecting ribs. The plurality of connecting ribs are arranged at intervals along the outer periphery of the support portion, and an exhaust passage is formed between adjacent connecting ribs.

[0015] In some embodiments, the housing has a second air inlet. A partition plate with a through hole is provided in the housing to divide the inner cavity of the housing into an air inlet chamber and a silencing chamber that communicate with each other through the through hole. The air inlet chamber is communicated with the second air inlet, the silencing chamber is communicated with the first opening structure, and the silencing component is arranged in the silencing chamber.

[0016] In some embodiments, an annular protrusion portion protruding towards the air inlet chamber is provided along the periphery of the through hole on the partition plate.

[0017] In some embodiments, a third annular groove surrounding the through hole is provided on the side of the partition plate facing the silencing chamber; a second cylindrical structure for air inlet protrudes from the air inlet end of the silencing component, and the second cylindrical structure extends into the third annular groove and is hermetically connected to the third annular groove.

[0018] In some embodiments, the end of the second cylindrical structure abuts against the step portion of the third annular groove to limit the movement of the silencing component towards the partition plate.

[0019] In some embodiments, a first flange is provided on the periphery of the first connection end, and a second flange is provided on the periphery of the second connection end. The first connection end and the second connection end are connected through the first flange and the second flange.

[0020] The silencing device of the compressor according to the embodiment of the present application, the first connection end of the housing of the silencer is provided with a first opening structure, and the exhaust end of the silencing component extends to the first opening structure. The second connection end of the valve body of the check valve is provided with a first air inlet. By connecting the first connection end and the second connection end, the connection between the exhaust end of the silencing component and the first air inlet can be realized, and the second connection end can also block the first opening structure of the silencer. In this way, the connection between the silencer and the check valve is realized through a simple and compact connection structure, which is beneficial to the miniaturization and light weight of the silencing device of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In combination with the accompanying drawings and with reference to the following detailed description, the above and other features, advantages and aspects of the embodiments of the present application will become more obvious. In the drawings, the same or similar reference numerals represent the same or similar elements, where:

[0022] Figure 1 The side view of the silencing device of the compressor according to some embodiments of the present application is shown;

[0023] Figure 2 The sectional view of the silencing device of the compressor according to some embodiments of the present application is shown;

[0024] Figure 3 The three-dimensional sectional view of the silencing device of the compressor according to some embodiments of the present application is shown;

[0025] Figure 4 The exploded view of the silencing device of the compressor according to some embodiments of the present application is shown;

[0026] Figure 5 The side view of the check valve according to some embodiments of the present application is shown;

[0027] Figure 6 The exploded view of the check valve according to some embodiments of the present application is shown;

[0028] Figure 7 Shows Figure 2 The partial enlarged view of part A; and

[0029] Figure 8 Shows Figure 2 The partial enlarged view of part B.

[0030] Description of the reference numerals:

[0031] 100 - silencer;

[0032] 110 - housing; 111 - first connection end; 112 - first opening structure; 113 - first law

[0033] Landing plate; 114 - Second air inlet; 115 - Air inlet chamber; 116 - Soundproof chamber;

[0034] 120 - Soundproof component; 121 - Air guide cylinder; 122 - Soundproof structure body; 123 - First cylinder

[0035] Structure; 124 - Second cylinder structure;

[0036] 130 - Partition plate; 131 - Through hole; 132 - Annular convex part; 133 - Third annular groove; 134 - Third sealing ring;

[0037] 200 - Check valve;

[0038] 210 - Valve body; 211 - Main body part; 212 - Valve cavity; 213 - Second connection end; 214 - Second flange; 215 - Second opening structure; 216 - Second annular groove; 217 - Second groove;

[0039] 218 - Second sealing ring; 219 - Reinforcing rib;

[0040] 220 - Baffle ring; 221 - First air inlet; 222 - First annular groove; 223 - First

[0041] Sealing ring; 224 - Sealing surface; 225 - First groove;

[0042] 230 - Spool assembly; 231 - Spool; 232 - Reset elastic member; 233 - Support part; 234 - Guide hole; 235 - Guide rod; 236 - Connecting rib. Detailed implementation manners

[0043] Hereinafter, preferred embodiments of the present application will be described in more detail with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0044] As used herein, the term "comprising" and its variants mean open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The term "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects.

[0045] The embodiment of the present application provides a soundproof device for a compressor. Refer to Figures 1 to 4As shown, the sound silencing device of the compressor according to the embodiment of the present application includes a silencer 100 and a check valve 200.

[0046] The silencer 100 includes a housing 110 and a sound silencing component 120. The housing 110 has a first connection end 111, and the first connection end 111 is provided with a first opening structure 112 communicating with the inner cavity of the housing 110. The sound silencing component 120 is arranged in the inner cavity, and the exhaust end of the sound silencing component 120 extends to the first opening structure 112. The sound silencing component 120 here is used to perform sound silencing treatment on the flowing air flow to reduce the intensity of the noise generated by the air flow.

[0047] Alternatively or additionally, the housing 110 may include a cylindrical structure (such as a cylindrical shape or approximately a cylindrical shape), and the first connection end 111 may be one end of the cylindrical structure in the axial direction. The first connection end 111 of the cylindrical structure may be open to form the first opening structure 112. The sound silencing component 120 is arranged in the inner cavity near the first connection end 111, and the exhaust end of the sound silencing component 120 may be aligned with the first connection end 111, or the exhaust end of the sound silencing component 120 may also protrude from the end face of the first connection end 111.

[0048] The check valve 200 includes a valve body 210 and a valve core assembly 230 arranged in the valve body 210. The valve core assembly 230 here is used to cooperate with the valve body 210 to form the check valve function of the check valve 200 to prevent the reverse flow of gas. The valve body 210 has a second connection end 213, and the second connection end 213 is provided with a first air inlet 221. The second connection end 213 is connected to the first connection end 111, and the second connection end 213 blocks the first opening structure 112, and the exhaust end of the sound silencing component 120 is connected to the first air inlet 221.

[0049] Alternatively or additionally, cooperate Figures 1 - 6 As shown, the valve body 210 may have a main body portion 211, a valve cavity 212 is provided in the main body portion 211, and a first air inlet 221 may be provided at one end of the main body portion 211 close to the silencer 100 (that is, the second connection end 213).

[0050] Alternatively or additionally, a first flange 113 may be provided on the outer peripheral portion of the first connection end 111. A second flange 214 may be provided on the outer peripheral portion of the second connection end 213. The first connection end 111 and the second connection end 213 may be connected through the first flange 113 and the second flange 214. Exemplarily, the outer peripheral edge of the first connection end 111 may extend radially outward to form the first flange 113. The outer peripheral edge of the second connection end 213 may extend radially outward to form a second flange 214 matching the first flange 113. The second flange 214 and the first flange 113 may be connected to each other through a plurality of bolts.

[0051] Alternatively or additionally, a plurality of reinforcing ribs 219 may be provided between the back side of the second flange 214 and the outer peripheral portion of the main body 211, and the plurality of reinforcing ribs 219 are arranged at intervals along the circumferential direction of the main body 211. Alternatively or additionally, the main body 211, the second flange 214 and the plurality of reinforcing ribs 219 may adopt an integral structure. For example, the valve body 210 may adopt an integral casting structure.

[0052] In the silencing device of the compressor according to the embodiment of the present application, a first opening structure 112 is provided at the first connection end 111 of the housing 110 of the silencer 100, and the exhaust end of the silencing component 120 extends to the first opening structure 112. A first air inlet 221 is provided at the second connection end 213 of the valve body 210 of the check valve 200. By connecting the first connection end 111 and the second connection end 213, the connection between the exhaust end of the silencing component 120 and the first air inlet 221 can be realized, and the first opening structure 112 of the silencer 100 can also be blocked. In this way, the direct connection between the silencer 100 and the check valve 200 is realized through a simple and compact connection structure, which is beneficial to the miniaturization and light weight of the silencing device of the compressor.

[0053] In some embodiments, in cooperation Figure 2 and Figure 6 As shown, a first cylinder structure 123 for exhausting air is convexly provided at the exhaust end of the silencing component 120. The second connection end 213 is provided with a first annular groove 222 surrounding the first air inlet 221, and the first cylinder structure 123 extends into the first annular groove 222 and is hermetically connected to the first annular groove 222. In this way, during assembly and maintenance, only by opposing the first connection end 111 and the second connection end 213, and opposing the first cylinder structure 123 of the silencing component 120 to the first annular groove 222 and inserting it into the first annular groove 222, the sealing connection between the exhaust end of the silencing component 120 and the first air inlet 221 of the check valve 200 can be realized simultaneously, with a simple structure and being beneficial to improving the convenience of assembly and maintenance.

[0054] Alternatively or additionally, the silencing component 120 may include a gas guide cylinder 121 and a silencing structure body 122 wrapped around the outer peripheral side of the gas guide cylinder 121. A plurality of mesh holes are formed in the cylinder wall of the gas guide cylinder 121, and the silencing structure body 122 may be formed by a silencing material. One end of the gas guide cylinder 121 may protrude from the silencing structure body 122 to form the first cylinder structure 123 for exhausting air.

[0055] Alternatively or additionally, the axis of the silencing component 120 and the axis of the first air inlet 221 may coincide. In this way, the centering of the silencing component 120 and the first air inlet 221 can be realized, and it can be ensured that the airflow flowing out of the silencing component 120 stably flows into the first air inlet 221.

[0056] Alternatively or additionally, a first sealing ring 223 is provided on the inner peripheral wall of the first annular groove 222. The outer peripheral surface of the first cylindrical structure 123 contacts the first sealing ring 223 to form a circumferential sealing connection. Exemplarily, an annular step portion may be provided around the first air inlet 221 outside the first air inlet 221, and the first annular groove 222 communicating with the first air inlet 221 is formed outside the first air inlet 221 through the annular step portion. Exemplarily, a first groove 225 may be circumferentially formed on the inner peripheral wall of the first annular groove 222, the first sealing ring 223 is disposed in the first groove 225, and the inner peripheral portion of the first sealing ring 223 protrudes from the first groove 225. The first cylindrical structure 123 extends into the first annular groove 222 and passes through the first sealing ring 223, and the outer peripheral surface of the first cylindrical structure 123 is in close contact with the inner peripheral portion of the first sealing ring 223 to form a circumferential sealing connection.

[0057] In some embodiments, mating Figure 2 , Figure 6 and Figure 7 As shown, the valve cavity 212 of the valve body 210 extends to the second connection end 213 to form a second opening structure 215. The second connection end 213 is provided with a baffle ring 220 that shields the second opening structure 215. A first air inlet 221 is provided in the middle of the baffle ring 220, and a first annular groove 222 is provided on the surface of the baffle ring 220 opposite to the silencing component 120. Thus, during the assembly or maintenance of the check valve 200, the spool assembly 230 can be first installed in the valve cavity 212, and then the second opening structure 215 can be blocked by the baffle ring 220, which can improve the convenience of assembling the check valve 200.

[0058] Alternatively or additionally, the second connection end 213 is provided with a second annular groove 216 that surrounds the second opening structure 215 and communicates with the second opening structure 215, and at least a part of the baffle ring 220 is embedded in the second annular groove 216. Thus, the end surface of the second connection end 213 can be kept flat.

[0059] Exemplarily, the second annular groove 216 may communicate with the second opening structure 215. A second groove 217 may be formed around the second opening structure 215 at the bottom of the second annular groove 216. A second sealing ring 218 may be embedded in the second groove 217, and a part of the second sealing ring 218 protrudes from the second groove 217. The baffle ring 220 is embedded in the second annular groove 216 and is connected to the valve body 210 through a connecting member such as a bolt. Thus, a sealing connection is achieved between the baffle ring 220 and the valve body 210.

[0060] In some embodiments, mating Figure 2 and Figure 7As shown, on the side of the baffle ring 220 facing away from the silencing component 120, there is a sealing surface 224 surrounding the first air inlet 221, and the valve core component 230 can contact the sealing surface 224 to block the first air inlet 221. In this way, the baffle ring 220 can not only be hermetically connected to the silencing component 120, but also cooperate with the valve core component 230 to prevent reverse gas flow, which is beneficial to simplifying the structure of the check valve 200 and improving the convenience of production and processing. Exemplarily, as Figure 7 shown, on the side of the baffle ring 220 facing away from the silencing component 120, a gradually expanding conical inclined surface can be provided around the first air inlet 221, and the sealing surface 224 can be formed through this conical inclined surface.

[0061] In some embodiments, in cooperation with Figures 2 to 4 、 Figure 7 shown, the valve core component 230 includes a mushroom-shaped valve core 231 and a return elastic member 232. The valve core 231 is movably connected in the valve cavity 212 of the valve body 210. The return elastic member 232 is connected to the valve core 231 and is used to apply a return elastic force to the valve core 231 so that the valve core 231 has a tendency to move towards the sealing surface 224. When the air flow pressure discharged by the silencing component 120 is large enough, the air flow can push the valve core 231 to overcome the return elastic force of the return elastic member 232, and the valve core 231 moves away from the sealing surface 224 and disengages from the sealing surface 224, and the air flow enters the valve cavity 212 through the gap between the valve core 231 and the sealing surface 224. When the air pressure is small, the valve core 231 is in close contact with the sealing surface 224 under the action of the return elastic force to seal the first air inlet 221 and prevent reverse air flow.

[0062] In some embodiments, in cooperation with Figure 2 and Figure 3 shown, a support portion 233 is provided in the middle of the valve cavity 212, a guiding hole 234 is provided in the middle of the support portion 233, a guiding rod 235 is provided on the side of the valve core 231 facing away from the first air inlet 221, and the guiding rod 235 is movably connected in the guiding hole 234. In this way, the valve core 231 can stably move along the extension direction of the guiding rod 235 and the guiding hole 234, which is beneficial to improving the stability and reliability of the check valve 200. Exemplarily, the return elastic member 232 can include a return spring. The return spring can be sleeved on the guiding rod 235, and the two ends of the return spring can be respectively abutted against the valve core 231 and the support portion 233. The return spring can be configured to be in a compressed state so that the return spring has a tendency to stretch, thereby being able to apply a return elastic force towards the sealing surface 224 to the valve core 231. Of course, the return elastic member 232 is not limited to a spring and can also be formed by other elastic members.

[0063] In some embodiments, in cooperation with Figure 3As shown, the support portion 233 is connected to the inner wall of the valve cavity 212 through a plurality of connecting ribs 236, and the plurality of connecting ribs 236 are arranged at intervals along the outer periphery of the support portion 233, and an exhaust channel is formed between adjacent connecting ribs 236. In this way, the plurality of connecting ribs 236 can not only stably support the support portion 233 in the middle of the valve cavity 212, but also ensure smooth exhaust of the airflow through the exhaust channel between adjacent connecting ribs 236 to reduce gas resistance.

[0064] Alternatively or additionally, the support portion 233 is conical or has a conical tip with an arc surface, and the tip of the support portion 233 faces the first air outlet opposite to the first air inlet 221. In this way, the airflow can be guided to flow to the first air outlet, which is conducive to reducing exhaust resistance.

[0065] Alternatively or additionally, the valve body 210 , the support portion 233 , and the connecting rib 236 may be of an integral structure, for example, the valve body 210 , the support portion 233 , and the connecting rib 236 may be of an integral casting structure.

[0066] In some embodiments, Figure 2 and Figure 3 As shown, the housing 110 has a second air inlet 114 connected to the inner cavity, and a partition 130 is provided in the inner cavity, through which the inner cavity of the housing 110 is divided into an air inlet chamber 115 and a muffler chamber 116. A through hole 131 is provided in the middle of the partition 130, and the air inlet chamber 115 and the muffler chamber 116 are connected to each other through the through hole 131. The air inlet chamber 115 is connected to the second air inlet 114, and the muffler chamber 116 is connected to the first opening structure 112, and the muffler assembly 120 is arranged in the muffler chamber 116. In this way, the airflow flows into the air inlet chamber 115 through the second air inlet 114, and then flows into the muffler chamber 116 through the air inlet chamber 115, which is conducive to improving the muffler effect of the muffler 100.

[0067] Exemplarily, the housing 110 may include a cylindrical structure, one end of which is open to form a first opening structure 112, and the other end of the cylindrical structure may be sealed. The periphery of the cylindrical structure may be provided with a second air inlet 114, and the second air inlet 114 may be close to the other end of the cylindrical structure. The partition 130 may be provided in the cylindrical structure and close to the middle of the cylindrical structure itself in the axial direction.

[0068] Alternatively or additionally, an annular protrusion 132 protruding toward the air inlet chamber 115 is provided on the partition plate 130 along the periphery of the through hole 131. In this way, the airflow will be turned back and disturbed on the outer peripheral side of the annular protrusion 132, and then flow into the muffler assembly 120 through the annular protrusion 132, which is conducive to improving the muffler effect of the muffler 100.

[0069] In some embodiments, Figure 2 ,Figure 3 and Figure 8 As shown in Figure 8 , on one side of the anechoic chamber 116 facing the partition 130, a third annular groove 133 surrounding the through hole 131 is provided. The air inlet end of the sound absorption assembly 120 is convexly provided with a second cylindrical structure 124 for air intake. The second cylindrical structure 124 extends into the third annular groove 133 and is hermetically connected to the third annular groove 133. Exemplarily, the other end of the air guide cylinder 121 of the sound absorption assembly 120 may protrude from the sound absorption structure body 122 to form the second cylindrical structure 124. A third sealing ring 134 may be provided in the third annular groove 133. The second cylindrical structure 124 may pass through the third sealing ring 134 and be in close contact with the third sealing ring 134 to achieve a sealed connection.

[0070] In some embodiments, the end of the first cylindrical structure 123 may abut against the stepped portion (i.e., the bottom of the first annular groove 225) of the first annular groove 225, and the end of the second cylindrical structure 124 may abut against the stepped portion (i.e., the bottom of the third annular groove 133) of the third annular groove 133. In this way, the sound absorption assembly 120 can be stably restricted between the check valve 200 and the partition 130, avoiding the movement of the sound absorption assembly 120 towards the check valve 200 or the partition 130, which is beneficial to improving the stability of the sound absorption assembly 120.

[0071] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the disclosed embodiments.

Claims

1. A silencing device for a compressor, characterized in that, Comprising: A silencer, including a housing and a silencing component. The housing has a first connection end, and the first connection end is provided with a first opening structure communicating with the inner cavity of the housing. The silencing component is disposed in the inner cavity and the exhaust end of the silencing component extends to the first opening structure; A check valve, including a valve body and a spool assembly disposed in the valve body. The valve body has a second connection end, the second connection end is provided with a first air inlet, the second connection end is connected to the first connection end, and the second connection end blocks the first opening structure. The exhaust end of the silencing component is connected to the first air inlet.

2. The silencing device for a compressor according to claim 1, characterized in that, The exhaust end of the silencing component protrudes with a first cylindrical structure for exhausting; the second connection end is provided with a first annular groove surrounding the first air inlet, and the first cylindrical structure extends into the first annular groove and is hermetically connected to the first annular groove.

3. The silencing device of the compressor according to claim 2, characterized in that, The silencing component includes a gas guide cylinder with mesh holes in the cylinder wall and a silencing structure body wrapped around the outer peripheral side of the gas guide cylinder. One end of the gas guide cylinder protrudes from the silencing structure body to form the first cylindrical structure.

4. The silencing device for a compressor according to claim 2, characterized in that, The inner peripheral wall of the first annular groove is provided with a first sealing ring; the outer peripheral surface of the first cylindrical structure contacts the first sealing ring to form a sealed connection.

5. The sound silencing device of the compressor according to claim 2, characterized in that, The end of the first cylindrical structure abuts against the stepped portion of the first annular groove to limit the movement of the silencing component towards the check valve.

6. The silencing device for a compressor according to claim 2, characterized in that, The valve cavity of the valve body extends to the second connection end to form a second opening structure. The second connection end is provided with a baffle ring blocking the second opening structure. The middle of the baffle ring is provided with the first air inlet, and the side of the baffle ring facing the silencing component is provided with the first annular groove.

7. The silencing device of the compressor according to claim 6, characterized in that, The second connection end is provided with a second annular groove surrounding the second opening structure and communicating with the second opening structure, and at least a part of the baffle ring is embedded in the second annular groove.

8. The silencing device for a compressor according to claim 6, characterized in that, The side of the baffle ring facing away from the silencing component is provided with a sealing surface surrounding the first air inlet, and the spool assembly can contact the sealing surface to block the first air inlet.

9. The silencing device of a compressor according to claim 1, characterized in that, The spool assembly includes a mushroom-shaped spool and a reset elastic member. The spool is movably connected in the valve cavity of the valve body; the reset elastic member is connected to the spool for applying a reset elastic force to the spool.

10. The silencing device for a compressor according to claim 9, characterized in that, A support portion is provided in the middle of the valve cavity. A guide hole is provided in the middle of the support portion. A guide rod is provided on the side of the spool facing away from the first air inlet. The guide rod is movably connected in the guide hole.

11. The silencing device of the compressor according to claim 10, characterized in that, The support portion is connected to the inner wall of the valve cavity through a plurality of connecting ribs. The plurality of connecting ribs are spaced apart along the outer periphery of the support portion, and an exhaust passage is formed between adjacent connecting ribs.

12. The silencing device of the compressor according to claim 1, characterized in that, The housing has a second air inlet. A partition plate with a through hole is provided in the housing to divide the inner cavity of the housing into an air inlet chamber and a silencing chamber that communicate with each other through the through hole. The air inlet chamber is communicated with the second air inlet, the silencing chamber is communicated with the first opening structure, and the silencing component is disposed in the silencing chamber.

13. The silencing device of the compressor according to claim 12, characterized in that, An annular protruding portion protruding towards the air inlet chamber is provided along the periphery of the through hole on the partition plate.

14. The silencing device of the compressor according to claim 12, characterized in that, One side of the anechoic chamber facing the partition is provided with a third annular groove surrounding the through hole; the air inlet end of the sound absorption component protrudes with a second cylindrical structure for air intake, and the second cylindrical structure extends into the third annular groove and is hermetically connected to the third annular groove.

15. The silencing device of a compressor according to claim 14, characterized in that, The end of the second cylindrical structure abuts against the stepped portion of the third annular groove to limit the movement of the sound absorption component towards the partition.

16. The silencing device of the compressor according to claim 1, characterized in that, A first flange is provided on the periphery of the first connection end, and a second flange is provided on the periphery of the second connection end. The first connection end and the second connection end are connected through the first flange and the second flange.

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