Exhaust muffling structure and compressor

Abstract

The application relates to an exhaust muffling structure and a compressor, which comprise an exhaust end muffling base and multiple mufflers. The exhaust end muffling base is internally provided with a muffling mounting cavity and a muffling exhaust port communicated with the muffling mounting cavity, and is also provided with a gas inlet connected with the muffling mounting cavity. The multiple mufflers are all mounted in the muffling mounting cavity, each of the mufflers is provided with a muffling shell surrounding a muffling cavity, the muffling shell is provided with multiple muffling through holes communicated with the muffling cavity, and the multiple mufflers have different inherent frequencies. The multiple mufflers with different inherent frequencies are used to suppress airflow pulsation noise of different frequencies, so that the airflow pulsation noise under variable working conditions can be well reduced.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an exhaust noise reduction structure and a compressor. Background Technology

[0002] Screw compressors generate electromagnetic noise, mechanical vibration noise, and airflow pulsation noise during operation. While mechanical vibration noise has been improved with increased manufacturing and assembly precision, airflow pulsation noise still needs to be reduced.

[0003] Generally, components that reduce airflow pulsation noise can only reduce airflow pulsation under specific operating conditions. For variable operating conditions, such as variable frequency screw compressors operating at variable speeds, such mechanisms cannot effectively reduce airflow pulsation noise. Summary of the Invention

[0004] This invention addresses the problem of poor reduction of airflow pulsation noise under varying operating conditions by proposing an exhaust silencer structure and compressor. It utilizes multiple silencers with different perforation rates to suppress airflow pulsation noise at different frequencies, thereby achieving a better reduction effect on airflow pulsation noise under varying operating conditions.

[0005] An exhaust muffler structure, comprising:

[0006] An exhaust-end muffler base is provided with a muffler mounting cavity and a muffler exhaust port communicating with the muffler mounting cavity. The exhaust-end muffler base is also provided with a gas inlet connected to the muffler mounting cavity.

[0007] Multiple mufflers are installed in the muffler mounting cavity. Each muffler has a muffler housing that surrounds the muffler cavity. The muffler housing has multiple muffler through holes that communicate with the muffler cavity. The multiple mufflers have different natural frequencies.

[0008] In one embodiment, the volumes of the various silencing cavities are different;

[0009] And / or the perforation rates of each of the mufflers are different.

[0010] In one embodiment, the exhaust end muffler seat is further provided with a bearing mounting cavity for installing the exhaust end bearing, and all the mufflers are arranged at intervals from the bearing mounting cavity.

[0011] In one embodiment, a plurality of the mufflers are arranged at intervals in the muffler mounting cavity.

[0012] In one embodiment, all the mufflers are cylindrical, and the center distance between two adjacent mufflers is not less than 1.05 times the outer diameter of the cylinder of the muffler.

[0013] In one embodiment, the surface passing through the muffler exhaust port and perpendicular to the air intake direction of the muffler exhaust port is a virtual projection surface. All the mufflers constitute a muffler unit, and the projection of the muffler unit on the virtual projection surface covers the location of the muffler exhaust port.

[0014] In one embodiment, the surface passing through the muffler exhaust port and perpendicular to the air intake direction of the muffler exhaust port is a virtual projection surface. All the mufflers constitute a muffler unit, and the muffler unit includes multiple muffler layers. Each muffler layer includes at least one muffler, and the multiple muffler layers are arranged sequentially at intervals in the direction close to the virtual projection surface.

[0015] In one embodiment, all the mufflers are cylindrical, the center distance between two adjacent mufflers belonging to the same muffler layer is H1, and the center distance between two adjacent mufflers belonging to different muffler layers is H2, where H1 is greater than H2.

[0016] In one embodiment, all the silencers are cylindrical, and the direction from the gas inlet to the silencer exhaust port is a first direction, with the axial direction of the silencer intersecting the first direction.

[0017] In one embodiment, the exhaust-end muffler seat includes a first seat body and a second seat body, which are movably connected, allowing the exhaust-end muffler seat to have a closed state and an open state. In the closed state, the first seat body and the second seat body form the muffler mounting cavity. In the open state, the first seat body and the second seat body are at least partially separated, forming an installation opening for placing and removing the muffler. The muffler exhaust port is formed in the first seat body or the second seat body, and the gas inlet is formed in the first seat body or the second seat body. All the mufflers are detachably installed in the muffler mounting cavity.

[0018] In one embodiment, the muffler mounting cavity is a cylindrical space, the exhaust end muffler seat includes a radial side and an axial end, the radial side constitutes the sidewall of the cylindrical space, the axial end constitutes one end wall of the cylindrical space, the gas inlet is formed at one end of the radial side, the other end of the radial side is connected to the axial end, and the muffler exhaust port is formed at the axial end.

[0019] A compressor includes a compression section, a compressor housing, and an exhaust silencer structure as described in any one of the above claims. The compressor housing has a receiving space, the compression section is installed in the receiving space, the receiving space has a compression exhaust port, the compression section and the compressor housing enclose the compression space, the compression exhaust port communicates with the compression space, the exhaust end silencer is connected to the compressor housing, and the compression exhaust port is aligned and communicated with the gas inlet of the exhaust end silencer.

[0020] In one embodiment, the exhaust end muffler seat is detachably connected to the compressor housing, and all the mufflers are detachably installed in the muffler mounting cavity.

[0021] In one embodiment, the compressor further includes an exhaust end bearing for supporting the compression section, the exhaust end bearing being assembled in the exhaust end muffler.

[0022] The above solution provides an exhaust silencing structure and a compressor. The high-pressure working fluid compressed by the compression section in the accommodating space is discharged from the compression exhaust port into the silencing mounting cavity. Since the silencing mounting cavity is equipped with multiple silencers with different inherent frequencies, it can suppress airflow pulsation noise of various frequencies, thereby achieving a good reduction effect on airflow pulsation noise under varying operating conditions. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of the compressor described in this embodiment;

[0026] Figure 2 This is a cross-sectional view of the exhaust end muffler seat described in this embodiment;

[0027] Figure 3 This is a schematic diagram of a Helmholtz resonator.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Compressor; 11. Female screw rotor; 12. Male screw rotor; 13. Compression section; 20. Exhaust silencer structure; 21. Compressor housing; 211. Accommodation space; 212. Compression exhaust port; 22. Exhaust end silencer seat; 221. Silencer mounting cavity; 222. Silencer exhaust port; 223. Radial side; 224. Axial end; 23. Silencer unit; 231. Silencer; 2311. Silencer through hole; 232. First silencer layer; 233. Second silencer layer; 234. Third silencer layer. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] This application presents an exhaust muffler structure 20 designed to improve the reduction of airflow pulsation noise, such as... Figure 1 As shown in some embodiments, the exhaust silencer structure 20 is assembled to the compressor housing 21 and can be used to reduce the airflow pulsation of the working fluid discharged from the compression exhaust port 212 of the compressor housing 21. The compressor housing 21 has a receiving space 211 for accommodating the compression section. The receiving space 211 has the compression exhaust port 212. In this application, the compression section refers to the component in a compressor used to compress the working fluid, such as the part on the two screw rotors of a screw compressor 10 used to compress the working fluid. Figure 1 The female screw rotor 11 and the male screw rotor 12 are matched with each other, and the two screw rotors and the compressor housing 21 enclose a compression space. When the female screw rotor 11 and the male screw rotor 12 rotate, the working fluid is gradually compressed in the compression space, and finally the working fluid with higher pressure is rapidly discharged from the compression exhaust port 212 to the outside of the compression space.

[0032] In the air conditioning field, the high-pressure working fluid discharged from the compressor exhaust port 212 can be transported to a heat exchanger for heat exchange.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments, the exhaust muffler structure 20 includes an exhaust end muffler seat 22 and a plurality of mufflers 231.

[0034] The exhaust-end muffler seat 22 has a muffler mounting cavity 221 and a muffler exhaust port 222 communicating with the muffler mounting cavity 221. The exhaust-end muffler seat 22 also has a gas inlet connected to the muffler mounting cavity 221. The exhaust-end muffler seat 22 is used to connect with the compressor housing 21, and when the two are connected, the compression exhaust port 212 is aligned and connected with the gas inlet. The high-pressure working fluid discharged from the compression exhaust port 212 enters the muffler mounting cavity 221 and is then discharged from the muffler exhaust port 222.

[0035] The multiple silencers 231 are all installed within the silencer mounting cavity 221, and the natural frequencies of the multiple silencers 231 are different. As a result, the resonant frequencies of each silencer 231 are different, and the frequency range of airflow pulsations that they can focus on suppressing are different.

[0036] While continuously compressing the working fluid, the compression section also draws in gas, which is compressed along with the working fluid. As the high-pressure working fluid exits from the compression exhaust port 212, a high-pressure airflow is simultaneously discharged from the same port, creating airflow pulsation. The mixture of high-pressure working fluid and high-pressure gas passes through multiple silencers 231, each suppressing the airflow pulsation to reduce noise. Since the silencers 231 have different natural frequencies, they each effectively suppress different pulsation frequencies. Therefore, through the combined action of multiple silencers 231, airflow pulsations of different frequencies can be suppressed, resulting in a high reduction effect even in varying operating conditions.

[0037] Furthermore, such as Figure 3 As shown, in some embodiments, each of the silencers 231 is a Helmholtz resonant silencer, which uses the Helmholtz resonator principle to achieve noise reduction. A Helmholtz resonator mainly consists of a short tube (short tube length L) and a cavity (cavity volume V). When the frequency of the incident sound wave is close to the natural frequency within the Helmholtz cavity, the medium in the short tube of the Helmholtz resonator vibrates strongly. During this vibration, the medium overcomes frictional resistance and thus dissipates sound energy.

[0038] like Figure 1 and Figure 2As shown, in some embodiments of this application, each silencer 231 has a silencer housing surrounding a silencer cavity, and the silencer housing is provided with a plurality of silencer through holes 2311, all of which communicate with the silencer cavity. The silencer through holes 2311 are equivalent to the short tube in a Helmholtz resonator, and the silencer cavity is equivalent to the cavity in a Helmholtz resonator. When the environment in which the silencer 231 is located vibrates, and the vibration frequency is close to the natural frequency of the silencer 231, the medium in the silencer through holes 2311 will generate strong vibrations. During the vibration process, the medium needs to overcome frictional resistance to consume the energy of the vibration sound waves, thereby achieving the effect of reducing airflow pulsation. Moreover, only a small amount of working fluid in the silencer mounting cavity 221 travels back and forth through the silencer through holes 2311. When the working fluid travels back and forth through the silencer through holes 2311 of different silencers 231, it forms vibration waves of different frequencies. These vibration waves will interact with and be reduced by the original main vibration wave of the working fluid in the silencer mounting cavity 221, thus achieving the effect of vibration reduction. Therefore, by adopting the Helmholtz resonator principle, this application can reduce pressure loss as much as possible while reducing vibration.

[0039] Specifically, in some embodiments, the perforation rate of each muffler 231 is different, resulting in different natural frequencies for each muffler 231. In other embodiments, the volume of each silencing cavity is different, resulting in different natural frequencies for each muffler 231.

[0040] like Figure 1 As shown, the silencing housing is a cylindrical shell closed at both ends, and multiple silencing through holes 2311 are provided on the side wall of the silencing housing. The axial direction and height direction of the silencing housing are consistent. In some embodiments, the height of each silencing housing is not lower than the height of the apex of the silencing exhaust port 222. In other words, vibration waves must pass through the silencing housing before they can be transmitted to the silencing exhaust port, and the vibration waves are suppressed and reduced when passing through the silencing housing. Therefore, the limitation of the height of the silencing housing ensures that the airflow pulsation noise of the silencing exhaust port 222 is greatly reduced under the action of each silencer 231.

[0041] like Figure 1 As shown, in some embodiments, all the mufflers 231 are cylindrical. The direction of interval from the gas inlet to the muffler exhaust port 222 is a first direction; in other words, the direction of interval from the compressed exhaust port 212 to the muffler exhaust port 222 is the first direction. The axial direction of the muffler 231 intersects the first direction. Specifically, in one embodiment, as... Figure 1As shown, the axial direction of the muffler 231 is perpendicular to the first direction. Airflow pulsations, as they propagate along the first direction towards the muffler exhaust port 222, pass through the muffler 231. Since the circumference of the muffler 231 intersects the first direction, airflow pulsations with vibration frequencies near the natural frequency of the muffler 231 are more easily intercepted and reduced by the muffler.

[0042] Furthermore, in some embodiments, the surface passing through the muffler exhaust port 222 and perpendicular to the air intake direction of the muffler exhaust port 222 is a virtual projection surface. For example... Figure 2 As shown, all the mufflers 231 constitute a muffler unit 23. The projection of the muffler unit 23 on the virtual projection surface covers the location of the muffler exhaust port 222. The muffler unit 23 intercepts the airflow pulsation in front of the muffler exhaust port 222, preventing the airflow pulsation from being directly transmitted to the muffler exhaust port 222, ensuring that the muffler unit 23 can effectively reduce the airflow pulsation noise of the muffler exhaust port 222.

[0043] Specifically, such as Figure 1 and Figure 2 As shown, the noise reduction unit 23 includes multiple noise reduction layers, each of which includes at least one muffler 231, and the multiple noise reduction layers are arranged sequentially at intervals in the direction close to the virtual projection surface.

[0044] like Figure 2 As shown, in one embodiment, the silencing unit 23 includes three silencing layers: the layer closest to the silencing exhaust port 222 is the third silencing layer 234, the layer furthest from the silencing exhaust port 222 is the first silencing layer 232, and the middle layer is the second silencing layer 233. Both the first silencing layer 232 and the second silencing layer 233 include two mufflers 231 arranged side-by-side, with the two mufflers 231 on the same silencing layer spaced apart. The second silencing layer 233 includes one muffler 231. The muffler 231 included in the second silencing layer 233 corresponds to the gap between the two mufflers 231 included in the other two silencing layers.

[0045] When the airflow pulsations pass through the first anechoic layer 232, the airflow pulsation noise near a certain frequency is reduced. The unreduced noise is transmitted backward through the second anechoic layer 233, where it reduces the airflow pulsation noise near another frequency. This process continues, and after passing through three anechoic layers, most of the noise is reduced, resulting in a more stable working fluid discharged from the anechoic exhaust port 222.

[0046] like Figure 1 and Figure 2As shown, multiple silencers 231 are arranged at intervals in the silencer mounting cavity 221. A silencer 231 is positioned behind the gap between two spaced silencers 231, ensuring that the vibration wave passes through at least one silencer 231. Here, "behind a feature" refers to the side downstream of this feature along the working fluid flow direction.

[0047] In one specific embodiment, all the silencers 231 are cylindrical, and the center distance between two adjacent silencers 231 is not less than 1.05 times the outer diameter of the cylinder of the silencer 231. There are gaps between the two silencers 231 for the working fluid to flow directly through, and the vibration is reduced when the working fluid passes through the gaps.

[0048] The center distance between two adjacent silencers 231 belonging to the same anechoic layer is H1, and the center distance between two adjacent silencers 231 belonging to different anechoic layers is H2, where H1 is greater than H2. A larger spacing between two adjacent silencers 231 belonging to the same anechoic layer reduces obstruction to the forward flow of the working fluid and minimizes pressure loss. Conversely, less fluid crossflow occurs in the direction parallel to the direction of fluid movement, so adjacent silencers 231 in different anechoic layers can be arranged more compactly, meaning the spacing between them can be smaller. This ensures effective vibration reduction while minimizing the kinetic energy loss of the working fluid. Figure 2 As shown, the silencing mounting cavity 221 is provided with 5 silencers 231, of which the centers of 4 silencers 231 are respectively distributed at the four corners in a positive direction, and the center of the remaining silencer 231 is located at the geometric center in this positive direction.

[0049] Furthermore, in some embodiments, the exhaust end muffler seat 22 is also provided with a bearing mounting cavity for installing the exhaust end bearing, and all the mufflers 231 are arranged at intervals from the bearing mounting cavity. This means that each muffler 231 will not interfere with the bearing in the bearing mounting cavity, ensuring that the compression section 13 can be installed normally.

[0050] Specifically, in some embodiments, the bearing mounting cavity is a space formed within the exhaust end muffler seat 22 and spaced apart from the muffler mounting cavity 221, and the bearing mounting cavity and the muffler mounting cavity 221 are not connected. Alternatively, in other embodiments, the bearing mounting cavity is part of the muffler mounting cavity 221, and the bearing mounting cavity is located on the side of each muffler 231 near the gas inlet.

[0051] The aforementioned muffler mounting cavity 221 is directly formed within the exhaust end muffler seat 22, which is used to mount the exhaust end bearing. The mixed fluid can simultaneously reduce noise while being discharged from the compressed exhaust port 212, further enhancing the noise reduction effect. The exhaust end muffler seat 22 primarily supports the exhaust end bearing, which in turn supports the compression section. Forming the muffler mounting cavity 221 onto the exhaust end muffler seat 22, rather than adding a separate part to machine the muffler mounting cavity 221, also makes the overall structure of the exhaust muffler structure 20 more compact.

[0052] Furthermore, in some embodiments, the exhaust-end muffler seat 22 is detachably connected to the compressor housing 21, and all the mufflers 231 are detachably installed in the muffler mounting cavity 221. After removing the exhaust-end muffler seat 22 from the compressor housing 21, the mufflers 231 in the muffler mounting cavity 221 can be replaced.

[0053] When using it, a suitable muffler 231 can be selected as needed to ensure that the natural frequency of the muffler 231 meets the noise reduction requirements. For example, based on the frequency range of the compressor during operation, the airflow pulsation frequency range of the mixed fluid discharged from the compressor exhaust port 212 can be obtained. Each muffler 231 can be selected according to this frequency range so that the suppression range of each muffler 231 covers the airflow pulsation frequency range as much as possible.

[0054] A sealing ring is provided between the exhaust end muffler seat 22 and the compressor housing 21 to ensure that the sealing between the two is high when the exhaust end muffler seat 22 and the compressor housing 21 are connected together, so that the working fluid can move forward in the compression space to complete the compression process.

[0055] Alternatively, in some embodiments, the exhaust-end muffler seat 22 includes a first seat body and a second seat body, which are movably connected, allowing the exhaust-end muffler seat to have a closed state and an open state. In the closed state, the first seat body and the second seat body form the muffler mounting cavity 221. In the open state, the first seat body and the second seat body are at least partially separated, forming a mounting opening for placing and removing the muffler 231. The muffler exhaust port 222 is formed in the first seat body or the second seat body, the gas inlet is formed in the first seat body or the second seat body, and all the mufflers 231 are detachably mounted within the muffler mounting cavity 221.

[0056] When it is necessary to replace the muffler 231 in the muffler mounting cavity 221, first switch the first body and the second body to the open state so that the muffler 231 is exposed; after replacing the new muffler 231, assemble the first body and the second body together.

[0057] In some embodiments, the muffler mounting cavity 221 is a cylindrical space, and the exhaust end muffler seat 22 is obtained by a virtual cross section passing through the axis of this cylindrical space to obtain the first seat body and the second seat body.

[0058] Alternatively, the first body and the second body can be separated in other ways, without specific restrictions here.

[0059] More specifically, such as Figure 1 and Figure 2 As shown, in some embodiments, the exhaust-end muffler seat 22 includes a radial side portion 223 and an axial end portion 224. The radial side portion 223 forms the sidewall of the cylindrical space, and the axial end portion 224 forms one end wall of the cylindrical space. The gas inlet is formed at one end of the radial side portion 223, and the other end of the radial side portion 223 is connected to the axial end portion 224. The muffler exhaust port 222 is formed at the axial end portion 224. Here, one end and the other end of the radial side portion 223 refer to the two ends along the axial direction of the cylindrical space.

[0060] One end of the radial side 223 is connected to the compressor housing 21. The compression exhaust port 212 is located on the side of the radial side 223 close to the compressor housing 21. The mixed fluid discharged from the compression exhaust port 212 into the silencer mounting cavity 221 must pass through multiple silencers 231 before reaching the silencer exhaust port 222.

[0061] In some embodiments of this application, a compressor 10 is provided, including a compression section 13, a compressor housing 21 and the above-mentioned exhaust silencer structure 20. The compression section 13 is installed in the accommodating space 211, and the compression section 13 and the compressor housing 21 form a compression space. The compression exhaust port 212 is connected to the compression space.

[0062] The high-pressure working fluid compressed by the compression section in the accommodating space 211 will be discharged from the compression exhaust port 212 into the silencer mounting cavity 221. Since the silencer mounting cavity 221 is equipped with multiple silencers 231 with different perforation rates, it can suppress airflow pulsation noise of various frequencies, thereby achieving a good reduction effect on airflow pulsation noise under varying operating conditions.

[0063] The compression section 13 is part of the screw rotor, with both ends of the screw rotor mounted in bearings, and the compression section 13 located between the two bearings. The exhaust end muffler seat 22 is used to support the bearing located at one end of the screw rotor, namely the aforementioned exhaust end bearing.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An exhaust muffler structure, characterized in that, include: An exhaust-end muffler base is provided with a muffler mounting cavity and a muffler exhaust port communicating with the muffler mounting cavity. The exhaust-end muffler base is also provided with a gas inlet connected to the muffler mounting cavity. Multiple mufflers are installed in the muffler mounting cavity. Each muffler has a muffler housing that surrounds the muffler cavity. The muffler housing has multiple muffler through holes that communicate with the muffler cavity. The multiple mufflers have different natural frequencies. The surface passing through the muffler exhaust port and perpendicular to the air intake direction of the muffler exhaust port is a virtual projection surface. All the mufflers constitute a muffler unit. The muffler unit includes multiple muffler layers. Each muffler layer includes at least one muffler. The multiple muffler layers are arranged sequentially at intervals in the direction close to the virtual projection surface.

2. The exhaust muffler structure according to claim 1, characterized in that, The volume of each of the aforementioned silencing cavities is different; And / or the perforation rates of each of the mufflers are different.

3. The exhaust muffler structure according to claim 1, characterized in that, The exhaust end muffler seat is also provided with a bearing mounting cavity for installing the exhaust end bearing, and all the mufflers are arranged at intervals from the bearing mounting cavity.

4. The exhaust muffler structure according to claim 1, characterized in that, Multiple silencers are arranged at intervals in the silencer mounting cavity.

5. The exhaust muffler structure according to claim 4, characterized in that, All of the mufflers are cylindrical, and the center distance between two adjacent mufflers is not less than 1.05 times the outer diameter of the cylinder of the muffler.

6. The exhaust muffler structure according to claim 1, characterized in that, The surface passing through the muffler exhaust port and perpendicular to the air intake direction of the muffler exhaust port is a virtual projection surface. All the mufflers constitute a muffler unit, and the projection of the muffler unit on the virtual projection surface covers the location of the muffler exhaust port.

7. The exhaust muffler structure according to claim 1, characterized in that, All the mufflers are cylindrical. The center distance between two adjacent mufflers belonging to the same muffler layer is H1, and the center distance between two adjacent mufflers belonging to different muffler layers is H2. H1 is greater than H2.

8. The exhaust muffler structure according to claim 1, characterized in that, All of the mufflers are cylindrical, and the direction from the gas inlet to the muffler exhaust port is the first direction. The axial direction of the muffler intersects the first direction.

9. The exhaust muffler structure according to any one of claims 1 to 8, characterized in that, The exhaust-end muffler base includes a first body and a second body, which are movably connected, allowing the exhaust-end muffler base to have a closed state and an open state. In the closed state, the first body and the second body form the muffler mounting cavity. In the open state, the first body and the second body are at least partially separated, forming an installation opening for placing and removing the muffler. The muffler exhaust port is formed in the first body or the second body, and the gas inlet is formed in the first body or the second body. All the mufflers can be detachably installed in the muffler mounting cavity.

10. The exhaust muffler structure according to any one of claims 1 to 8, characterized in that, The muffler mounting cavity is a cylindrical space. The exhaust end muffler seat includes a radial side and an axial end. The radial side forms the side wall of the cylindrical space, and the axial end forms one end wall of the cylindrical space. The gas inlet is formed at one end of the radial side, and the other end of the radial side is connected to the axial end. The muffler exhaust port is formed at the axial end.

11. A compressor, characterized in that, The device includes a compression section, a compressor housing, and an exhaust silencing structure as described in any one of claims 1 to 10. The compressor housing has a receiving space, the compression section is installed in the receiving space, the receiving space has a compression exhaust port, the compression section and the compressor housing form a compression space, the compression exhaust port communicates with the compression space, the exhaust end silencing seat is connected to the compressor housing, and the compression exhaust port is aligned and communicated with the gas inlet of the exhaust end silencing seat.

12. The compressor according to claim 11, characterized in that, The exhaust end muffler seat is detachably connected to the compressor housing, and all the mufflers are detachably installed in the muffler mounting cavity.

13. The compressor according to claim 11, characterized in that, The compressor also includes an exhaust end bearing for supporting the compression section, the exhaust end bearing being assembled in the exhaust end muffler seat.

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