Silencer of air compressor and air compressor

Abstract

The embodiment of the utility model provides a silencer of an air compressor and the air compressor. The shell is provided with an inner cavity, an air inlet and an air outlet, and the air inlet and the air outlet are communicated with the inner cavity; the first silencing structure is cylindrical and is arranged in the inner cavity, the first silencing structure comprises a first sound absorption body, and the first sound absorption body comprises a plurality of first sound absorption material blocks which are regularly arranged; the second silencing structure is arranged in the first silencing structure, an airflow channel with an annular cross section is formed between the inner circumferential surface of the first silencing structure and the outer circumferential surface of the second silencing structure, and the two ends of the airflow channel are connected with the air inlet and the air outlet correspondingly; the second noise elimination structure comprises a second sound absorption body, and the second sound absorption body comprises a plurality of second sound absorption material blocks which are regularly arranged. Therefore, the silencing effect can be improved, the production efficiency can be improved, and the production cost can be reduced.

Description

Technical Field

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

[0002] A muffler is usually arranged in the air flow pipeline system of an air compressor to reduce the noise generated by the sudden change of air flow pressure in the air flow management system of the air compressor. Mufflers are generally divided into reactive mufflers and resistive mufflers. A resistive muffler uses sound-absorbing materials to absorb sound energy to reduce the noise level. The sound absorption effect of a resistive muffler is directly related to the size and shape of the sound-absorbing materials. The size of a single sound-absorbing material is relatively large. Although it can improve the sound absorption effect, it is prone to deformation, which will affect the sound absorption effect, and the production cost is relatively high. In addition, the sound absorption effect of traditional resistive mufflers for high-frequency noise needs to be improved. Summary of the Utility Model

[0003] The purpose of the present application is to provide a muffler for an air compressor and an air compressor to solve or at least partially solve the above problems and / or other potential problems existing in traditional mufflers.

[0004] The first aspect of the present application provides a muffler for an air compressor. The muffler includes: a housing having an inner cavity, and an air inlet and an air outlet communicating with the inner cavity; a first muffling structure in a cylindrical shape and arranged in the inner cavity, the first muffling structure including a first sound-absorbing body, and the first sound-absorbing body including a plurality of regularly arranged first sound-absorbing material blocks; a second muffling structure arranged in the first muffling structure, and an air flow channel with an annular cross-section is formed between the inner peripheral surface of the first muffling structure and the outer peripheral surface of the second muffling structure, and both ends of the air flow channel are respectively connected with the air inlet and the air outlet; the second muffling structure includes a second sound-absorbing body, and the second sound-absorbing body includes a plurality of regularly arranged second sound-absorbing material blocks.

[0005] In some embodiments, the first muffling structure further includes a first perforated muffling cover in a cylindrical shape, and the first perforated muffling cover is arranged in the cylindrical first sound-absorbing body and covers at least a part of the inner peripheral surface of the first sound-absorbing body.

[0006] In some embodiments, the first sound-absorbing material blocks are in an arc shape, and a plurality of first sound-absorbing material blocks are respectively regularly arranged along the axial direction and the circumferential direction of the first muffling structure to form a cylindrical first sound-absorbing body.

[0007] In some embodiments, the second sound-absorbing material blocks are in a cylindrical shape, and a plurality of second sound-absorbing material blocks are arranged along the axial direction of the cylinder to form a cylindrical second sound-absorbing body.

[0008] In some embodiments, the second sound absorption structure further includes a second perforated sound absorption cover in a cylindrical shape, and the second perforated sound absorption cover is sleeved on the outside of the second sound absorber and covers at least a part of the outer peripheral surface of the second sound absorber.

[0009] In some embodiments, at least some of the sound absorption material blocks among the plurality of first sound absorption material blocks and the plurality of second sound absorption material blocks are metal rubber blocks.

[0010] In some embodiments, the inner cavity has a first space and a second space. The first space has a first temperature range, and the second space has a second temperature range. The first temperature range is higher than the second temperature range. Among the plurality of first sound absorption material blocks and the plurality of second sound absorption material blocks, the sound absorption material blocks located in the first space are metal rubber blocks, and the sound absorption material blocks located in the second space are sponge blocks.

[0011] In some embodiments, it further includes flow guiding covers respectively arranged at both ends of the second sound absorption structure.

[0012] In some embodiments, the outer shape of the side of the flow guiding cover in contact with the air flow is conical or a cone with an arc-shaped top end.

[0013] In some embodiments, it further includes positioning brackets arranged at both ends of the second sound absorption structure. The positioning brackets are used to position the second sound absorption structure inside the first sound absorption structure, and the flow guiding covers are arranged on the positioning brackets.

[0014] In some embodiments, the first sound absorption structure further includes a first perforated sound absorption cover in a cylindrical shape. The first perforated sound absorption cover is arranged inside the first sound absorber in a cylindrical shape, and both ends of the first perforated sound absorption cover protrude from the first sound absorber. The two positioning brackets are respectively arranged in the parts where both ends of the first perforated sound absorption cover protrude from the first sound absorber.

[0015] In some embodiments, the positioning bracket includes an annular frame and an intermediate bracket located inside the annular frame. The end of the second sound absorption structure is connected to the intermediate bracket, and the outer peripheral part of the annular frame abuts against the part where the first perforated sound absorption cover protrudes from the first sound absorber.

[0016] In some embodiments, the housing includes an air inlet end with an air inlet and an air outlet end with an air outlet, and flange plates are respectively arranged at the air inlet end and the air outlet end.

[0017] The second aspect of the present application provides an air compressor, including the muffler as described above.

[0018] For the muffler of the air compressor in the embodiments of the present application, the first sound-absorbing body includes a plurality of first sound-absorbing material blocks, and the plurality of first sound-absorbing material blocks are arranged according to a certain rule to form the first sound-absorbing body. The second sound-absorbing body includes a plurality of second sound-absorbing material blocks, and the plurality of second sound-absorbing material blocks are also arranged according to a certain rule to form the second sound-absorbing body. In this way, the shapes and sizes of the first sound-absorbing body and the second sound-absorbing body are no longer limited by the processing technology and processing difficulty, and the first sound-absorbing body and the second sound-absorbing body with relatively large overall sizes can be formed, which is beneficial to improving the sound absorption effect. In addition, since the individual sizes of the first sound-absorbing material blocks and the second sound-absorbing material blocks are relatively small, they are easy to produce and process, which is beneficial to improving production efficiency and reducing production costs. Brief Description of the Drawings

[0019] In conjunction 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 apparent. In the drawings, the same or similar reference numerals denote the same or similar elements, where:

[0020] Figure 1 Shows a three-dimensional view of a muffler according to some embodiments of the present application;

[0021] Figure 2 Shows a side view of a muffler according to some embodiments of the present application;

[0022] Figure 3 Shows a cross-sectional view of a muffler according to some embodiments of the present application;

[0023] Figure 4 Shows a three-dimensional view of a first sound-absorbing body according to some embodiments of the present application;

[0024] Figure 5 Shows a three-dimensional view of a second sound-absorbing body according to some embodiments of the present application;

[0025] Figure 6 Shows a three-dimensional view of a partial internal structure of a muffler according to some embodiments of the present application;

[0026] Figure 7 Shows a three-dimensional view of an example of a flow deflector according to some embodiments of the present application; and

[0027] Figure 8 Shows a three-dimensional view of another example of a flow deflector according to some embodiments of the present application.

[0028] Description of the Reference Numerals:

[0029] 10 - Housing; 11 - Inner cavity; 12 - Air inlet; 13 - Air outlet; 14 - First housing part; 15 - Second housing part; 16 - Third housing part; 17 - First flange; 18 - Second flange; 19 - Air flow channel;

[0030] 20 - First sound - absorption structure; 21 - First sound - absorption body; 22 - First sound - absorption material block; 23 - First perforated sound - absorption cover;

[0031] 30 - Second sound - absorption structure; 31 - Second sound - absorption body; 32 - Second sound - absorption material block; 33 - Second perforated sound - absorption cover;

[0032] 41 - Deflector; 42 - Positioning bracket; 43 - Ring - shaped frame; 44 - Intermediate bracket. Detailed implementation manners

[0033] The preferred embodiments of the present application will be described in more detail below 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.

[0034] The term "including" and its variants used herein mean open - ended inclusion, i.e., "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 terms "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.

[0035] The embodiments of the present application provide a muffler for an air compressor. Referring to Figures 1 to 3 As shown, the muffler of the embodiments of the present application includes a housing 10, a first sound - absorption structure 20, and a second sound - absorption structure 30.

[0036] The housing 10 has an inner cavity 11, and an air inlet 12 and an air outlet 13 communicating with the inner cavity 11. The first sound - absorption structure 20 is cylindrical and disposed in the inner cavity 11. The first sound - absorption structure 20 includes a first sound - absorption body 21, and the first sound - absorption body 21 includes a plurality of regularly arranged first sound - absorption material blocks 22. The second sound - absorption structure 30 is disposed within the first sound - absorption structure 20, and an air flow channel 19 with an annular cross - section is formed between the inner peripheral surface of the first sound - absorption structure 20 and the outer peripheral surface of the second sound - absorption structure 30. The two ends of the air flow channel 19 are respectively connected to the air inlet 12 and the air outlet 13. The second sound - absorption structure 30 includes a second sound - absorption body 31, and the second sound - absorption body 31 includes a plurality of regularly arranged second sound - absorption material blocks 32.

[0037] Alternatively or additionally, the housing 10 may include a first housing portion 14 in a cylindrical shape, and the first sound absorption structure 20 and the second sound absorption structure 30 may be disposed within the first housing 10. Alternatively or additionally, the housing 10 may further include a second housing portion 15 and a third housing portion 16 in a cylindrical shape and having a diameter smaller than that of the first housing portion 14. The second housing portion 15 may be connected to one end of the first housing portion 14 close to the air inlet 12, and the third housing portion 16 may be connected to one end of the first housing portion 14 close to the air outlet 13. Thus, it is beneficial to improve the stability of the air flow in and out.

[0038] Alternatively or additionally, the axes of the first housing portion 14, the second housing portion 15, and the third housing portion 16 may coincide, so that the first housing portion 14, the second housing portion 15, and the third housing portion 16 are centered, which is beneficial to reducing the resistance to the air flow. Of course, the above housing 10 is only exemplary, and the housing 10 may be constructed into any suitable shape and structure according to actual needs.

[0039] Alternatively or additionally, the housing 10 may further include an air inlet end having the air inlet 12 and an air outlet end having the air outlet 13, and flange plates are respectively provided at the air inlet end and the air outlet end. Exemplarily, the housing 10 may include a first flange plate 17 and a second flange plate 18. The first flange plate 17 may be connected to one end of the second housing portion 15 away from the first housing portion 14, and the second flange plate 18 may be connected to one end of the third housing portion 16 away from the first housing portion 14. The provision of the flange plates facilitates the connection of the muffler to the front-end intake pipeline and the rear-end exhaust pipeline. It should be noted that the front-end intake pipeline and the rear-end exhaust pipeline here may include gas transmission pipelines or may also include equipment.

[0040] Alternatively or additionally, the second sound absorption structure 30 may be in a cylindrical shape, and the axes of the second sound absorption structure 30 and the first sound absorption structure 20 may coincide. Thus, an air flow channel 19 having a cross-section in a circular ring shape or approximately in a circular ring shape can be formed, which is beneficial to improving the stability and uniformity of the air flow, and further beneficial to reducing the resistance to the gas. Of course, the above first sound absorption structure 20 and second sound absorption structure 30 are only exemplary, and in actual applications, the first sound absorption structure 20 and the second sound absorption structure 30 may also be constructed into other shapes. For example, the cross-section of the housing 10 may also be in a rectangular shape. The first sound absorption structure 20 may be constructed into a cylindrical structure with a rectangular cross-section, and the second sound absorption structure 30 may be constructed into a columnar structure with a rectangular cross-section, so as to form an air flow channel 19 with a rectangular ring-shaped cross-section.

[0041] During actual use, gas flows into the inner cavity 11 of the housing 10 from the air inlet 12 and enters the annular air flow channel 19. Sound waves can enter the first sound-absorbing body 21 of the first sound-absorbing structure 20 and the second sound-absorbing body 31 of the second sound-absorbing structure 30 within the air flow channel 19. The sound waves can rub and collide with the first sound-absorbing body 21 and the second sound-absorbing body 31, and part of the energy of the sound waves will be converted into heat energy of the sound-absorbing material, thereby achieving the purpose of reducing the noise intensity. Finally, the air flow will be discharged into the rear exhaust pipe through the air outlet 13.

[0042] For the muffler according to the embodiment of the present application, the first sound-absorbing body 21 includes a plurality of first sound-absorbing material blocks 22, and the plurality of first sound-absorbing material blocks 22 are arranged regularly to form the first sound-absorbing body 21. The second sound-absorbing body 31 includes a plurality of second sound-absorbing material blocks 32, and the plurality of second sound-absorbing material blocks 32 are also arranged regularly to form the second sound-absorbing body 31. In this way, the shapes and sizes of the first sound-absorbing body 21 and the second sound-absorbing body 31 are no longer limited by the processing technology and processing difficulty, and relatively large-sized first sound-absorbing body 21 and second sound-absorbing body 31 can be formed, which is beneficial to improving the sound-absorbing effect. In addition, since the sizes of the first sound-absorbing material blocks 22 and the second sound-absorbing material blocks 32 are relatively small, they are easy to produce and process, which is beneficial to improving production efficiency and reducing production costs.

[0043] In some embodiments, in cooperation with Figure 3 and Figure 4 as shown, the first sound-absorbing material blocks 22 are arc-shaped, and the plurality of first sound-absorbing material blocks 22 are respectively arranged regularly along the axial direction and the circumferential direction of the first sound-absorbing structure 20 to form a cylindrical first sound-absorbing body 21. The arc-shaped first sound-absorbing material here should be understood as an arc-shaped structure having a certain thickness in the radial direction. The plurality of first sound-absorbing material blocks 22 can be arranged in sequence along the circumferential direction of the first sound-absorbing structure 20 to form an annular structure, and the plurality of annular structures can be arranged in sequence along the axial direction of the first sound-absorbing structure 20 to form a cylindrical first sound-absorbing body 21.

[0044] It can be understood that the specific structure of the above-mentioned first sound-absorbing material blocks 22 is only exemplary. In actual applications, the first sound-absorbing material blocks 22 can also be constructed into other shapes. The plurality of first sound-absorbing material blocks 22 are not limited to being arranged in the above manner, and the plurality of first sound-absorbing material blocks 22 can be arranged according to any appropriate rule to form a cylindrical or approximately cylindrical first sound-absorbing body 21. For example, the first sound-absorbing material blocks 22 can also be rectangular parallelepiped-shaped material blocks, and the plurality of rectangular parallelepiped-shaped material blocks can be arranged along the axial direction of the first sound-absorbing structure 20 to form an approximately cylindrical first sound-absorbing body 21.

[0045] In some embodiments, in cooperation with Figure 3As shown, the first sound absorption structure 20 further includes a first perforated sound absorption cover 23 in a cylindrical shape. The first perforated sound absorption cover 23 is disposed within the first sound absorber 21 in a cylindrical shape and covers at least a part of the inner peripheral surface of the first sound absorber 21. In this way, during the flow of the air flow along the air flow passage 19, the sound wave will pass through the holes of the first perforated sound absorption cover 23, and during the process of passing through the holes, it will collide and rub against the holes, and part of the energy of the sound wave will be converted into heat, thereby reducing the noise intensity. By providing the first perforated sound absorption cover 23, it is beneficial to improve the sound absorption effect of the muffler. Moreover, the first perforated sound absorption cover 23 can protect the first sound absorber 21 and prevent the air flow from damaging the sound absorption material.

[0046] In some embodiments, Figure 5 As shown, the second sound absorption material block 32 is cylindrical, and a plurality of second sound absorption material blocks 32 are arranged along the axial direction of the cylinder to form a cylindrical second sound absorber 31. Exemplarily, the second sound absorption material block 32 can be in a flat cylindrical shape. That is, the ratio between the size in the diameter direction and the size in the axial direction of the second sound absorption material block 32 is relatively large. In this way, it is beneficial to reduce the production and processing difficulty and production cost.

[0047] It can be understood that the specific structure of the above-mentioned second sound absorption material block 32 is only exemplary. In actual application, the second sound absorption material block 32 can also be constructed into other shapes. The plurality of second sound absorption material blocks 32 are not limited to being arranged in the above manner. The plurality of second sound absorption material blocks 32 can be arranged according to any appropriate rule to form the second sound absorber 31. For example, the second sound absorption material block 32 can also be in an annular shape, and a plurality of annular second sound absorption material blocks 32 can be arranged in sequence along the axial direction of the second sound absorption structure 30 to form a cylindrical second sound absorber 31.

[0048] In some embodiments, Figure 3 and Figure 6 As shown, the second sound absorption structure 30 further includes a second perforated sound absorption cover 33 in a cylindrical shape. The second perforated sound absorption cover 33 is sleeved outside the second sound absorber 31 and covers at least a part of the outer peripheral surface of the second sound absorber 31. In this way, during the flow of the air flow along the air flow passage 19, the sound wave will pass through the holes of the second perforated sound absorption cover 33, and during the process of passing through the holes, it will collide and rub against the holes, and part of the energy of the sound wave will be converted into heat, thereby reducing the noise intensity. By providing the second perforated sound absorption cover 33, it is beneficial to improve the sound absorption effect of the muffler. Moreover, the second perforated sound absorption cover 33 can protect the second sound absorber 31 and prevent the air flow from damaging the sound absorption material of the second sound absorber 31.

[0049] In some embodiments, at least some of the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 are metal rubber blocks. The metal rubber blocks herein refer to porous block structures with a certain elasticity formed by pressing (such as stamping or rolling, etc.) metal wires. By arranging the metal rubber blocks, a better sound absorption effect can be achieved for high-frequency noise, and the metal rubber blocks have the characteristic of high temperature resistance, enabling the muffler to be applicable to high-temperature environments or used for reducing the noise of high-temperature gases. Alternatively or additionally, the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 may include a plurality of metal rubber blocks with different densities. By arranging metal rubber blocks with different densities, noises in different frequency bands can be eliminated to increase the frequency band range covered by the muffler.

[0050] In some embodiments, a part of the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 are metal rubber blocks, and another part of the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 are sponge blocks. In this way, the sound absorption effect, high temperature resistance characteristics, and production cost can be taken into account. Alternatively or additionally, the inner cavity 11 has a first space and a second space. The first space has a first temperature range, and the second space has a second temperature range, and the first temperature range is higher than the second temperature range. The sound-absorbing material blocks located in the first space among the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 are metal rubber blocks, and the sound-absorbing material blocks located in the second space among the plurality of first sound-absorbing material blocks 22 and the plurality of second sound-absorbing material blocks 32 are sponge blocks. The first temperature range may be the working temperature range of the first space during the operation of the muffler or the temperature range that may occur in the first space during the production and processing of the muffler. Similarly, the second temperature range may be the temperature range of the first space during the operation of the muffler or the temperature range that may occur in the first space during the production and processing of the muffler. The first space and the second space here may be continuous spaces or discontinuous spaces. There may be an obvious boundary line between the first space and the second space, or there may be no obvious boundary line. The inner cavity 11 is not limited to including only the first space and the second space, and may also include other controls outside the first space and the second space, such as a third space, a fourth space, etc. The embodiments of the present disclosure do not limit this.

[0051] For example, during the production and processing of the muffler, welding is required at both ends of the housing 10. The temperature of the space near both ends of the housing 10 in the inner cavity 11 is relatively high, and the temperature of the space near the middle of the housing 10 in the inner cavity 11 is relatively low. The space near both ends of the housing 10 in the inner cavity 11 can be used as the first space, and the space near the middle of the housing 11 in the inner cavity 11 can be used as the second space. Metal rubber blocks can be arranged near both ends of the inner cavity 11, and sponge blocks can be arranged in the middle of the inner cavity 11.

[0052] In some embodiments, the muffler may further include positioning brackets 42 disposed at both ends of the second muffling structure 30. The positioning brackets 42 are used to position the second muffling structure 30 within the first muffling structure 20. In this way, the stability of the muffler can be improved. Alternatively or additionally, the first sound-absorbing body 21 may be disposed within the first housing portion 14, the first perforated muffling cover 23 is disposed within the first sound-absorbing body 21, and both ends of the first perforated muffling cover 23 may protrude from the first sound-absorbing body 21, and the protruding portions of both ends of the first perforated muffling cover 23 may respectively extend into the second housing portion 15 and the third housing portion 16. The two positioning brackets 42 are respectively disposed within the portions where both ends of the first perforated muffling cover 23 protrude from the first sound-absorbing body 21 to limit the second muffling structure 30 between the two positioning brackets 42. For example, both ends of the second muffling structure 30 may be respectively connected to the middle portions of the two positioning brackets 42, the two positioning brackets 42 may be respectively disposed within these two protruding portions, and the outer peripheral portions of the two positioning brackets 42 may be in contact with the inner peripheral portions of these two protruding portions. In this way, not only can the displacement of the second muffling structure 30 in the axial direction be restricted, but also the displacement of the second muffling structure 30 in the radial direction can be restricted to stably position the second muffling structure 30 within the first muffling structure 20.

[0053] In some embodiments, as Figure 6 shown, the positioning bracket 42 may include an annular frame 43 and an intermediate bracket 44 located within the annular frame 43. The end of the second muffling structure 30 may be connected to the intermediate bracket 44, and the outer peripheral portion of the annular frame 43 may be in contact with the portion where the first perforated muffling cover 23 protrudes from the first sound-absorbing body 21. Alternatively or additionally, the intermediate bracket 44 may be in a cross shape or other shapes. It can be understood that the specific structure, installation position, and connection method of the above-mentioned positioning bracket 42 are all exemplary. In actual applications, any appropriate positioning bracket 42 can be selected according to actual needs. The present application is not limited in this regard.

[0054] In some embodiments, in cooperation with Figure 3 and Figure 6 shown, the muffler may further include flow guiding covers 41 respectively disposed at both ends of the second muffling structure 30. The flow guiding covers 41 can guide the air flow to smoothly flow into the air flow channel 19 and can guide the air flow in the air flow passage to smoothly flow out, which is beneficial to reducing the resistance to the air flow and reducing the pressure drop of the gas.

[0055] In some embodiments, in cooperation with Figure 7 shown, the flow guiding cover 41 may be configured as a cone with an arc-shaped top end, so that the flow guiding cover 41 has a better flow guiding effect. In some other embodiments, in cooperation with Figure 8As shown, the fairing 41 can be configured as a cone. In this way, both the flow guiding effect and the production and processing cost can be taken into account. It should be understood that the cone or conical shape here refers to the external shape of the side of the fairing 41 in contact with the air flow, and the inside of the fairing 41 can be a solid structure. The fairing 41 can also be a hollow structure to reduce the production cost.

[0056] Alternatively or additionally, the fairing 41 can be arranged on the positioning bracket 42. In this way, the positioning bracket 42 is reused to support the fairing 41, providing a simple and feasible implementation method for the installation of the fairing 41, which is beneficial to simplifying the structure of the muffler. Exemplarily, a plurality of card slots corresponding to the cross-shaped intermediate bracket 44 can be provided at the root end of the fairing 41, and the fairing 41 can be clamped on the intermediate bracket 44 through the card slots.

[0057] The embodiment of the present application also provides an air compressor, including the muffler described in any of the above embodiments. The muffler can be arranged at the air outlet of the air compressor or at the air outlet of the exhaust pipe of the air compressor. Since the above muffler has a relatively low production cost and excellent sound absorption effect, applying the above muffler is beneficial to reducing the production cost of the air compressor and reducing the noise level of the air compressor.

[0058] 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 skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A muffler for an air compressor, characterized in that: include: A shell having an inner cavity, and an air inlet and an air outlet communicated with the inner cavity; A first sound-absorbing structure, which is cylindrical and disposed in the inner cavity, wherein the first sound-absorbing structure comprises a first sound-absorbing body, and the first sound-absorbing body comprises a plurality of regularly arranged first sound-absorbing material blocks; The second sound-absorbing structure is arranged in the first sound-absorbing structure, and an air flow channel with a circular cross-section is formed between the inner circumference of the first sound-absorbing structure and the outer circumference of the second sound-absorbing structure, and the two ends of the air flow channel are respectively connected to the air inlet and the air outlet; the second sound-absorbing structure includes a second sound-absorbing body, and the second sound-absorbing body includes a plurality of regularly arranged second sound-absorbing material blocks.

2. The muffler of the air compressor according to claim 1, characterized in that: The first sound-absorbing structure further includes a first cylindrical perforated sound-absorbing cover, which is disposed in the first cylindrical sound-absorbing body and covers at least a portion of the inner circumference of the first sound-absorbing body.

3. The muffler of the air compressor according to claim 1, characterized in that: The first sound absorbing material block is in an arc shape, and a plurality of the first sound absorbing material blocks are regularly arranged along the axial direction and the circumferential direction of the first sound-absorbing structure to form the first cylindrical sound absorbing body.

4. The muffler for an air compressor according to claim 1, characterized in that: The second sound absorbing material block is cylindrical, and a plurality of the second sound absorbing material blocks are arranged along the axial direction of the cylinder to form a cylindrical second sound absorbing body.

5. The muffler for an air compressor according to claim 1, characterized in that: The second sound-absorbing structure further includes a second perforated sound-absorbing cover in a cylindrical shape, wherein the second perforated sound-absorbing cover is sleeved on the outer side of the second sound-absorbing body and covers at least a part of the outer peripheral surface of the second sound-absorbing body.

6. The muffler for an air compressor according to claim 1, characterized in that: At least some of the plurality of first sound absorbing material blocks and the plurality of second sound absorbing material blocks are metal rubber blocks.

7. The muffler for an air compressor according to claim 6, characterized in that: The inner cavity has a first space and a second space, the first space has a first temperature range, the second space has a second temperature range, and the first temperature range is higher than the second temperature range; the sound absorbing material blocks located in the first space among the plurality of first sound absorbing material blocks and the plurality of second sound absorbing material blocks are metal rubber blocks, and the sound absorbing material blocks located in the second space among the plurality of first sound absorbing material blocks and the plurality of second sound absorbing material blocks are sponge blocks.

8. The muffler for an air compressor according to claim 1, characterized in that: It also includes guide covers respectively arranged at two ends of the second sound-absorbing structure.

9. The muffler for an air compressor according to claim 8, characterized in that: The outer shape of the side of the deflector that contacts the airflow is a cone or a cone with an arc-shaped top.

10. The muffler for an air compressor according to claim 8, characterized in that: It also includes positioning brackets arranged at both ends of the second sound-absorbing structure, the positioning brackets are used to position the second sound-absorbing structure in the first sound-absorbing structure, and the air guide cover is arranged on the positioning brackets.

11. The muffler for an air compressor according to claim 10, characterized in that: The first sound-absorbing structure also includes a first cylindrical perforated sound-absorbing cover, which is arranged in the first cylindrical sound-absorbing body and has two ends protruding from the first sound-absorbing body. The two positioning brackets are respectively arranged in the parts of the first perforated sound-absorbing body protruding from the two ends of the first perforated sound-absorbing cover.

12. The muffler for an air compressor according to claim 11, characterized in that: The positioning bracket includes an annular frame and an intermediate bracket located in the annular frame, the end of the second sound-absorbing structure is connected to the intermediate bracket, and the outer periphery of the annular frame abuts against the portion of the first perforated sound-absorbing cover protruding from the first sound-absorbing body.

13. The muffler for an air compressor according to claim 1, characterized in that: The shell comprises an air inlet end having the air inlet and an air outlet end having the air outlet, and the air inlet end and the air outlet end are respectively provided with flanges.

14. An air compressor, characterized in that: Comprising a muffler as claimed in any one of claims 1 to 13.

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