A silencer and compressor

Abstract

The present application relates to the compressor field, specifically to a kind of muffler and compressor, the muffler is arranged on the flange plate of the pump body assembly of compressor, the flange plate is provided with exhaust hole;The muffler includes first shell, the first shell is covered on the flange plate and is sealed with the outer edge of the flange plate Connection;First protrusion and second protrusion protruding away from the flange plate are provided on the first shell, the inside of the first protrusion forms first resonance cavity towards the flange plate, the inside of the second protrusion is provided with second resonance cavity towards the flange plate, the air inlet of the first resonance cavity and the air inlet of the second resonance cavity are opposite with the exhaust hole, the depth of the second resonance cavity is less than the depth of the first resonance cavity, to carry out muffling to the noise of different frequency band.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressors, in particular to a silencer and a compressor. BACKGROUND

[0002] With the development of high speed and miniaturization of compressors, as an important source of rotor compressor noise, the gas flow noise will cause the compressor to produce a large exhaust noise when the compressor works under full load for a long time, thereby causing the noise of the air conditioner indoor unit and affecting the user's experience.

[0003] Generally, the compressor housing is filled with high-pressure gas, in order to reduce the gas pressure pulsation and exhaust noise when discharging, a silencer is generally installed. At present, single-layer or double-layer silencers are mostly used. The refrigerant gas discharged from the cylinder flows in the cavity between the silencer and the cylinder, thereby reducing the exhaust noise. However, due to the effect of the cavity structure of the silencer, the cavity mode is determined, and after eliminating part of the noise, new gas resonance noise will be generated, and the noise of other frequency bands cannot be eliminated.

[0004] Patent No. 202120298823.2 provides a silencing device, as shown in Figure 5 The silencing device includes: an inner silencer, the inner cavity of the inner silencer forms an exhaust cavity; an outer silencer, the outer silencer covers the inner silencer; a closed space is formed between the inner and outer silencers, and a hole pipe and the closed space together form a Helmholtz resonance cavity; the compressor can effectively reduce noise in a specific frequency band of 10Hz to 500Hz, but the silencing device cannot effectively reduce noise in more frequency bands.

[0005] Patent No. 202110087224.0 provides a silencer and a rotary compressor comprising the same, as shown in Figure 6 The silencer is a double-layer structure, the resonance cavities with different widths and / or heights are arranged in series, and the inner layer silencer is provided with a hole. When the airflow in the compressor passes through the silencer, the series arrangement of the resonance cavities and the hole arrangement of the inner layer silencer both increase the frictional resistance when the airflow passes through, thereby consuming sound energy, further reducing the medium and high frequency airflow pulsation in the compressor, reducing the aerodynamic noise of high-pressure refrigerant, and improving the silencing effect of the silencer; However, the silencer can only silence specific sound frequency bands and cannot reduce noise in more sound frequency bands.

[0006] How to silence noise in different frequency bands and further improve the exhaust noise of the compressor is a technical problem that needs to be solved at present. SUMMARY

[0007] In order to silence noise in different frequency bands, a silencer and a compressor are provided.

[0008] The muffler is arranged on a flange plate of a pump body assembly of a compressor, and the flange plate is provided with an exhaust hole; the muffler comprises a first shell which covers the flange plate and is in sealing connection with the outer edge of the flange plate;

[0009] The first shell is provided with a first protrusion and a second protrusion protruding away from the flange plate, the first protrusion is internally formed with a first resonance cavity facing the flange plate, the second protrusion is internally provided with a second resonance cavity facing the flange plate, the air inlet of the first resonance cavity and the air inlet of the second resonance cavity are opposite to the exhaust hole, and the depth of the second resonance cavity is smaller than the depth of the first resonance cavity.

[0010] Preferably, the first resonance cavity is internally provided with a sound attenuation pipe, and the pipe wall of the sound attenuation pipe is provided with a plurality of sound attenuation holes.

[0011] Preferably, the first shell is further provided with a third protrusion protruding away from the flange plate, the third protrusion is internally formed with a third resonance cavity facing the flange plate, and the third resonance cavity is internally provided with a sound attenuation baffle extending from the bottom wall of the third resonance cavity towards the flange plate.

[0012] The side of the first shell facing the flange plate is provided with a groove, and the groove is in communication with the first resonance cavity, the second resonance cavity and the third resonance cavity.

[0013] Preferably, one side of the third protrusion is provided with a fourth protrusion, the fourth protrusion is internally provided with a first sound attenuation cavity facing the flange plate, and the air inlet of the first sound attenuation cavity is in communication with the groove.

[0014] Preferably, the first sound attenuation cavity comprises a large cavity and a small cavity, the small cavity is arranged close to the air inlet of the first sound attenuation cavity, and the large cavity is provided with a first air outlet hole.

[0015] Preferably, the first shell is further provided with a fifth protrusion protruding away from the flange plate, the fifth protrusion is internally formed with a second sound attenuation cavity facing the flange plate, the fifth protrusion is provided with a second air outlet hole facing the center of the flange plate, and the air inlet of the second sound attenuation cavity is in communication with the groove.

[0016] Preferably, the first shell is further provided with a sixth protrusion protruding away from the flange plate, the sixth protrusion is internally formed with a third sound attenuation cavity facing the flange plate, the sixth protrusion is provided with a plurality of third air outlet holes facing the center of the flange plate and a plurality of fourth air outlet holes facing away from the center of the flange plate, and the air inlet of the third sound attenuation cavity is in communication with the groove.

[0017] Preferably, the sixth protruding top end is stepped and comprises a first step surface and a second step surface; the first step surface is close to the center of the flange and is higher than the second step surface.

[0018] Preferably, the center of the first shell is provided with a first accommodation hole; the first protrusion, the third protrusion, the sixth protrusion and the fifth protrusion are arranged around the first accommodation hole in sequence; the groove is annular and is arranged around the first accommodation hole.

[0019] Preferably, the muffler further comprises a second shell;

[0020] The second shell covers the first shell, and the edge of the second shell is sealingly connected with the edge of the first shell; an expansion cavity is formed between the second shell and the first shell.

[0021] In another aspect, the application further provides a compressor comprising a flange and the muffler.

[0022] Preferably, the center of the flange is provided with a journal extending towards the compressor muffling cavity; the center of the first shell is provided with a first accommodation hole, the center of the second shell is provided with a second accommodation hole, the muffler is interference fitted on the journal through the first accommodation hole and the second accommodation hole, and the edge of the first shell is sealingly connected with the flange.

[0023] The journal is provided with a communication groove, and the gas in the expansion cavity can be discharged through the communication groove.

[0024] The application improves the muffling effect of the muffler by arranging a first resonance cavity and a second resonance cavity on the first shell, the depths of the two resonance cavities are different (the depth of the second resonance cavity is smaller than that of the first resonance cavity), and the gas inlet of each resonance cavity is opposite to the exhaust hole on the flange; the gas discharged from the exhaust hole enters the first resonance cavity and the second resonance cavity at the same time, and the different depths of the first resonance cavity and the second resonance cavity enable the two resonance cavities to weaken the sound of different frequency bands, thereby improving the muffling effect of the muffler. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0026] The structures, proportions, sizes, etc. shown in the specification are merely used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and do not define the limiting conditions for implementing the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the disclosed technology.

[0027] Figure 1 A first shell of an embodiment of the present application is shown in the figure.

[0028] Figure 2 A first radial cross-sectional view of the first shell of the embodiment of the present application is shown in the figure.

[0029] Figure 3 A second radial cross-sectional view of the first shell of the embodiment of the present application is shown in the figure.

[0030] Figure 4 A second shell of an embodiment of the present application is shown in the figure.

[0031] Figure 5 A first embodiment of the prior art is shown in the figure.

[0032] Figure 6 A second embodiment of the prior art is shown in the figure.

[0033] The following signs are used in the figures:

[0034] 1, first shell; 101, first protrusion; 102, second protrusion; 103, third protrusion; 104, fourth protrusion; 105, fifth protrusion; 106, sixth protrusion; 1011, first resonance cavity; 1021, second resonance cavity; 1031, third resonance cavity; 1041, first sound-attenuating cavity; 1051, second sound-attenuating cavity; 1061, third sound-attenuating cavity; 1141, first air outlet; 1151, second air outlet; 1361, third air outlet; 1461, fourth air outlet; 1012, sound-attenuating pipe; 1013, sound-attenuating hole; 1032, sound-attenuating partition; 1042, large cavity; 1043, small cavity; 1261, first step surface; 1262, second step surface; 2, second shell; 3, flange; 301, air outlet; 302, groove; 303, journal; 304, communication groove; 4, groove; 5, expanded cavity; 601, first clearance hole; 602, second clearance hole. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting on the application or its uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort fall within the scope of the present application.

[0036] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise.

[0037] In addition, it should also be understood that when the terms "comprise" and / or "include" are used in the specification, it indicates the presence of a feature, step, operation, device, component and / or combinations thereof; the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the goods or systems including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such goods or systems. Without more limitations, the element defined by the phrase "including a" does not exclude the presence of additional identical elements in the goods or systems including the element.

[0038] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0039] Unless otherwise specified, the relative arrangement of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the art may not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0041] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0042] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and does not have a sequential order; unless otherwise stated, the above words have no special meaning, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0043] The present application relates to the field of compressors, in particular to a silencer and a compressor.

[0044] With the development of high speed and miniaturization of compressors, air flow noise as an important source of rotor compressor noise, the compressor will produce larger exhaust noise when working under full load for a long time, thereby causing the noise of the air conditioner indoor unit and affecting the user's experience.

[0045] Generally, the compressor housing is high-pressure gas, in order to reduce the gas pressure pulsation and exhaust noise when discharging, generally equipped with a muffler. At present, single-layer muffler or double-layer muffler is mostly used. The refrigerant gas discharged from the cylinder flows in the cavity between the muffler and the cylinder, thereby reducing the exhaust noise. But due to the effect of the cavity structure of the muffler, the cavity mode is determined, and after eliminating part of the noise, new gas resonance noise will be produced, and the noise of other frequency bands cannot be eliminated.

[0046] Patent No. 202120298823.2 provides a kind of muffler, as shown in Figure 5 The muffler includes: an inner muffler, the internal cavity of the inner muffler forms an exhaust cavity;An outer muffler, the outer muffler covers the inner muffler;Form a closed space between the inner and outer mufflers, form a Helmholtz resonance cavity with the closed space through the hole pipe;Realize the effective noise reduction of compressor in 10Hz to 500Hz specific frequency band, but the muffler cannot effectively reduce more sound frequency band.

[0047] Patent No. 202110087224.0 provides a kind of muffler and a rotor compressor comprising the same, as shown in Figure 6 The muffler is a double-layer structure, forms a resonance cavity with different width and / or height in series, and the inner layer of the muffler is provided with a hole, when the airflow in the compressor passes through the muffler, the resonance cavity in series and the hole of the inner layer of the muffler increase the friction resistance when the airflow passes through, thereby consuming sound energy, and then reducing the medium and high frequency airflow pulsation in the compressor, reducing the aerodynamic noise of high-pressure refrigerant, and improving the sound attenuation effect of the muffler;However, the muffler can only attenuate specific sound frequency band, and cannot reduce and attenuate more sound frequency band.

[0048] In order to attenuate noise of different frequency bands, a muffler and a compressor are provided.

[0049] The present application provides a kind of muffler, as shown in Figures 1-3 The muffler is arranged on the flange plate 3 of the pump body assembly of the compressor, and the flange plate 3 is provided with an exhaust hole 301;The muffler includes a first shell 1, the first shell 1 covers the flange plate 3 and is sealingly connected with the outer edge of the flange plate 3;

[0050] The first housing 1 is provided with a first protrusion 101 and a second protrusion 102 protruding away from the flange 3. The interior of the first protrusion 101 forms a first resonant cavity 1011 facing the flange 3, and the interior of the second protrusion 102 is provided with a second resonant cavity 1021 facing the flange 3. The air inlet of the first resonant cavity 1011 and the air inlet of the second resonant cavity 1021 are both opposite to the exhaust hole 301. The depth of the second resonant cavity 1021 is less than the depth of the first resonant cavity 1011.

[0051] The gas discharged from the compressor is discharged through the exhaust port 301 on the flange 3. Part of the gas directly enters the first resonant cavity 1011, where it is silenced. The remaining gas enters the second resonant cavity 1021, where it is silenced. Since the depth of the second resonant cavity 1021 is less than that of the first resonant cavity 1011, the noise reduction frequency of the second resonant cavity 1021 is different from that of the first resonant cavity 1011. This increases the range of noise reduction frequencies that the silencer can reduce, thus improving the noise reduction effect.

[0052] Considering the actual installation and the installation of the motor that drives the compressor, in the radial direction of the flange 3, the second protrusion 102 can be set outside the first protrusion 101, so that the top of the second protrusion 102 is lower than the top of the first protrusion 101; this arrangement facilitates the installation of the motor above the muffler.

[0053] When the compressor is in a vertical position, the first housing 1 is located on the upper side of the upper flange and fixed to the upper flange. When the compressor is used as a refrigeration or heating device, the gas discharged by the compressor is a high-temperature and high-pressure refrigerant. The refrigerant goes upward through the exhaust port 301 of the upper flange and enters the silencer (the cavity between the first housing 1 and the upper flange).

[0054] Preferred, such as Figure 2 As shown, a silencing tube 1012 is provided inside the first resonant cavity 1011, and a plurality of silencing holes 1013 are provided on the tube wall of the silencing tube 1012.

[0055] The sound attenuation pipe 1012 is arranged in the first resonance cavity 1011, and sound attenuation holes 1013 on the sound attenuation pipe 1012 increase the friction resistance of the high-pressure gas when flowing, thereby achieving consumption of sound energy and reducing the pressure pulsation of the gas; the sound attenuation pipe 1012 can be arranged along the axial direction of the flange plate 3 and fixed on the bottom wall of the first resonance cavity 1011. The bottom wall of the first resonance cavity 1011 refers to the wall surface opposite to the gas inlet of the first resonance cavity 1011. There is a gap between the outer wall surface of the sound attenuation pipe 1012 and the inner wall surface of the first resonance cavity 1011, which facilitates the flow of the gas around the sound attenuation pipe 1012, and the sound attenuation holes 1013 on the sound attenuation pipe 1012 can better reduce the pressure pulsation of the gas when the gas flows around the sound attenuation pipe 1012.

[0056] Preferably, as shown in Figure 1 and Figure 3 The first shell 1 is further provided with a third protrusion 103 protruding away from the flange plate 3, and a third resonance cavity 1031 is formed inside the third protrusion 103 and faces the flange plate 3, and a sound attenuation partition plate 1032 extending from the bottom wall of the third resonance cavity 1031 towards the flange plate 3 is arranged in the third resonance cavity 1031.

[0057] The first shell 1 is provided with a groove 4 on the side facing the flange plate 3, and the groove 4 communicates with the first resonance cavity 1011, the second resonance cavity 1021 and the third resonance cavity 1031.

[0058] The gas flowing out of the first resonance cavity 1011 and the second resonance cavity 1021 flows along the groove 4 to the third resonance cavity 1031, and the third resonance cavity 1031 further reduces the noise of the gas; the sound attenuation partition plate 1032 in the third resonance cavity 1031 divides the third resonance cavity 1031 into smaller cavities, which form Helmholtz sound attenuation cavities to further reduce noise. The sizes of the two cavities are different, thereby attenuating noise of different frequency bands.

[0059] Preferably, as shown in Figure 2 The side of the third protrusion 103 is provided with a fourth protrusion 104, and a first sound attenuation cavity 1041 facing the flange plate 3 is arranged inside the fourth protrusion 104, and the gas inlet of the first sound attenuation cavity 1041 communicates with the groove 4.

[0060] The gas flowing out of the first resonance cavity 1011 and the second resonance cavity 1021 enters the first sound attenuation cavity 1041 in the fourth protrusion 104 through the groove 4, and the first sound attenuation cavity 1041 further attenuates the noise of the gas.

[0061] Preferably, as shown in Figure 3As shown, the first sound attenuation cavity 1041 includes a large cavity 1042 and a small cavity 1043, the small cavity 1043 is arranged close to the air inlet of the first sound attenuation cavity 1041, and the large cavity 1042 is provided with a first air outlet hole 1141.

[0062] The gas enters the first sound attenuation cavity 1041 from the air inlet, first flows through the small cavity 1043, then enters the large cavity 1042, and finally is discharged from the first air outlet hole 1141. The first sound attenuation cavity 1041 constitutes an expansion chamber muffler, which further reduces and attenuates the noise of the gas, thereby improving the sound attenuation effect of the muffler.

[0063] In the radial direction of the flange plate 3, since the first sound attenuation cavity 1041 is divided into the small cavity 1043 and the large cavity 1042 in the axial direction of the flange plate 3, the overall height is relatively high. Therefore, the fourth protrusion 104 can be arranged radially inward of the third protrusion 103, and the height of the third protrusion 103 is higher than that of the fourth protrusion 104, which facilitates the arrangement of the motor above the muffler.

[0064] Preferably, as shown in the drawings, Figure 3 As shown, the first housing 1 is further provided with a fifth protrusion 105 protruding away from the flange plate 3, the fifth protrusion 105 is internally formed with a second sound attenuation cavity 1051 facing the flange plate 3, the fifth protrusion 105 is provided with a second air outlet hole 1151 facing the center of the flange plate 3, and the air inlet of the second sound attenuation cavity 1051 is in communication with the groove 4.

[0065] The gas enters the second sound attenuation cavity from the groove 4, and the second sound attenuation cavity further reduces the noise of the gas. The gas is discharged from the second air outlet hole 1151 towards the middle of the flange plate 3 to avoid direct impact of the gas on the inner wall of the first housing 1, thereby causing additional noise.

[0066] When the flange plate 3 is provided with a groove 302 facing the first housing 1 and in communication with the exhaust hole 301, the groove 302 can extend to and communicate with the second sound attenuation cavity 1051, so that the gas discharged from the exhaust hole 301 can directly enter the second sound attenuation cavity 1051 through the groove 302.

[0067] Preferably, as shown in the drawings, Figure 2 As shown, the first housing 1 is further provided with a sixth protrusion 106 protruding away from the flange plate 3, the sixth protrusion 106 is internally formed with a third sound attenuation cavity 1061 facing the flange plate 3, the sixth protrusion 106 is provided with a plurality of third air outlet holes 1361 facing the center of the flange plate 3 and a plurality of fourth air outlet holes 1461 facing away from the center of the flange plate 3; and the air inlet of the third sound attenuation cavity 1061 is in communication with the groove 4.

[0068] The air entering the third sound attenuation cavity 1061 from the groove 4 is reflected back and forth in the third sound attenuation cavity 1061 along the radial direction of the flange plate 3, and the gas is gradually discharged through the third gas outlet hole 1361 and the fourth gas outlet hole 1461 during the reflection, thereby achieving the effect of reducing the pressure pulsation of the gas; the gas attenuates different frequency sound waves during the reflection, thereby reducing the size of the noise; since the third gas outlet hole 1361 and the fourth gas outlet hole 1461 are oppositely arranged in the radial direction of the flange plate 3, the forces generated by the gas when discharging from the third gas outlet hole 1361 and the fourth gas outlet hole 1461 can be relatively balanced, reducing the impact on the sixth protrusion 106, thereby reducing the vibration of the sixth protrusion 106 itself.

[0069] The plurality of third gas outlet holes 1361 and the plurality of fourth gas outlet holes 1461 are arranged in horizontal rows from top to bottom; in the height direction, the third gas outlet holes 1361 of each horizontal row are staggered with the fourth gas outlet holes 1461 of each horizontal row (not equal in height in the height direction); or, the third gas outlet holes 1361 of each horizontal row are opposite to the fourth gas outlet holes 1461 of each horizontal row (i.e. equal in height). Alternatively, the plurality of third gas outlet holes 1361 and the plurality of fourth gas outlet holes 1461 are arranged irregularly.

[0070] Preferably, the top end of the sixth protrusion 106 is stepped and includes a first step surface 1261 and a second step surface 1262; the first step surface 1261 is close to the center of the flange plate 3 and higher than the second step surface 1262.

[0071] By arranging the first step surface 1261 close to the center of the flange plate 3 and higher than the second step surface 1262, the depth of the third sound attenuation cavity 1061 is different, further reducing the pulsation of the gas; at the same time, the second step surface 1262 forms a space for the motor to be installed.

[0072] Preferably, as shown in Figure 2 The center of the first housing 1 is provided with a first space hole 601; the first protrusion 101, the third protrusion 103, the sixth protrusion 106 and the fifth protrusion 105 are arranged around the first space hole 601 in sequence; the groove 4 is annular and is arranged around the first space hole 601.

[0073] The gas discharged by the first resonant cavity 1011 and the second resonant cavity 1021 flows along the circumference of the flange plate 3 in two ways, one of which flows to the third resonant cavity 1031 and the first muffler cavity 1041, the gas flowing out of the third resonant cavity 1031 and the gas not entering the third resonant cavity 1031 and not entering the first muffler cavity 1041 flows along the groove 4 and enters the third muffler cavity 1061; the other flows to the second muffler cavity 1051, part of which enters the second muffler cavity 1051, and the other part flows along the groove 4 and enters the third muffler cavity 1061; the above two ways finally enter the third muffler cavity 1061, and after mixing in the third muffler cavity 1061, they flow out from the third gas outlet 1361 and the fourth gas outlet 1461. That is, the gas discharged from the exhaust port of the flange plate 3 passes through the first resonant cavity 1011 and the second resonant cavity 1021 (the first resonant cavity 1011 and the second resonant cavity 1021 are parallel) in turn, and is divided into two ways, one of which flows to the third resonant cavity 1031 and the first muffler cavity 1041 (the third resonant cavity 1031 and the first muffler cavity 1041 are parallel), and then flows out of the third muffler cavity 1061; the other part enters the second muffler cavity 1051 and flows out, and the other part continues to flow into the third muffler cavity 1061 and then flows out. By making the gas pass through different resonant cavities and muffler cavities in turn, and then consuming sound energy and muffling noise in multiple stages for different frequency bands, the gas flow pulsation and noise of the compressor are effectively reduced, and the noise reduction effect of the muffler is improved.

[0074] Preferably, as shown in Figure 1 and Figure 4 The muffler further comprises a second shell 2.

[0075] The second shell 2 covers the first shell 1, and the edge of the second shell 2 is sealingly connected to the edge of the first shell 1; an expansion cavity 5 is formed between the second shell 2 and the first shell 1.

[0076] The expansion cavity 5 is the entire space between the first shell 1 and the second shell 2.

[0077] The gas discharged by the first muffling cavity 1041, the second muffling cavity 1051 and the third muffling cavity 1061 enters the expansion cavity 5, suddenly expands in the third muffling cavity 1061, so that the first gas outlet hole 1141 on the first muffling cavity 1041 and the expansion cavity 5 form an expansion chamber muffler, further muffling the gas discharged by the first gas outlet; the second gas outlet hole 1151 on the second muffling cavity 1051 and the expansion cavity 5 form an expansion chamber muffler, further muffling the gas discharged by the second gas outlet hole 1151; the third gas outlet hole 1361 on the third muffling cavity 1061 and the expansion cavity 5 form an expansion chamber muffler, muffling the gas discharged by the third gas outlet hole 1361; the fourth gas outlet hole 1461 on the third muffling cavity 1061 and the expansion cavity 5 form an expansion chamber muffler, muffling the gas discharged by the fourth gas outlet hole 1461. The expansion chamber muffler can reduce the pressure pulsation of the gas and the aerodynamic noise. The expansion cavity 5 itself also forms a sound insulation cavity to insulate the noise in the first shell 1.

[0078] The application further provides a compressor comprising the flange plate 3 and the muffler.

[0079] Preferably, the center of the flange plate 3 is provided with a shaft neck 303 extending towards the compressor muffling cavity; the center of the first shell 1 is provided with a first allowance hole 601, the center of the second shell 2 is provided with a second allowance hole 602, the muffler is interference fitted on the shaft neck 303 through the first allowance hole 601 and the second allowance hole 602, and the edge of the first shell 1 is sealingly connected with the flange plate 3.

[0080] The shaft neck 303 is provided with a communication groove 304, and the gas in the expansion cavity 5 can be discharged through the communication groove 304.

[0081] The edge of the first shell 1 is sealingly connected with the flange plate 3, and the center of the first shell 1 is interference connected with the shaft neck 303 of the flange plate 3 through the first allowance hole 601, so that the first shell 1 can be more firmly fixed on the flange plate 3; similarly, the edge of the second shell 2 is fixed on the edge of the first shell 1, and the center of the second shell 2 is interference connected with the shaft neck 303 of the flange plate 3 through the second allowance hole 602, so that the second shell 2 can be more firmly fixed on the flange plate 3; the gas in the expansion cavity 5 is discharged through the communication groove 304.

[0082] The fixing mode of the second shell 2 in the prior art is generally that the second shell 2 is fixed with the first shell 1 only through the edge of the second shell 2, and the second accommodating hole 602 of the second shell 2 and the shaft neck 303 of the flange plate 3 form an annular space; in this way, the gas is discharged from the annular space; compared with the prior art, the center of the second shell 2 is also fixed with the shaft neck 303 of the flange plate 3, so that when the gas flowing in the expansion cavity 5 impacts the second shell 2, the second shell 2 will not vibrate unnecessarily, especially when the second shell 2 is relatively flat in the axial direction of the flange plate 3, the gas is easy to make the second shell 2 vibrate in the axial direction of the flange plate 3, and the center interference is used to fix the second shell 2, so as to avoid the vibration in the axial direction of the flange plate 3, further reduce the noise generated by the compressor, and effectively improve the overall noise level of the compressor.

[0083] In the prior art, the first shell 1 corresponds to an inner shell, and the second shell 2 corresponds to an outer shell, and the inner shell and the outer shell constitute a double-layer silencer.

[0084] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be regarded as the protection scope of the present application.

Claims

1. A muffler characterized by comprising: The muffler is arranged on a flange plate (3) of a pump body assembly of a compressor, and an exhaust hole (301) is arranged on the flange plate (3); the muffler comprises a first shell (1), which covers the flange plate (3) and is in sealing connection with the outer edge of the flange plate (3); A first protrusion (101) and a second protrusion (102) are arranged on the first shell (1) and protrude away from the flange plate (3), a first resonance cavity (1011) is formed in the first protrusion (101) and faces the flange plate (3), a second resonance cavity (1021) is arranged in the second protrusion (102) and faces the flange plate (3), the air inlet of the first resonance cavity (1011) and the air inlet of the second resonance cavity (1021) are opposite to the exhaust hole (301), and the depth of the second resonance cavity (1021) is smaller than the depth of the first resonance cavity (1011); A groove (4) is arranged on one side of the first shell (1) and faces the flange plate (3), and the groove (4) is in communication with the first resonance cavity (1011) and the second resonance cavity (1021). A sixth protrusion (106) is arranged on the first shell (1) and protrudes away from the flange plate (3), a third muffling cavity (1061) is formed in the sixth protrusion (106) and faces the flange plate (3), a plurality of third air outlets (1361) face the center of the flange plate (3), and a plurality of fourth air outlets (1461) face away from the center of the flange plate (3); the air inlet of the third muffling cavity (1061) is in communication with the groove (4).

2. The muffler of claim 1, wherein An acoustic pipe (1012) is arranged in the first resonance cavity (1011), and a plurality of acoustic holes (1013) are arranged on the pipe wall of the acoustic pipe (1012).

3. The muffler of claim 2, wherein A third protrusion (103) is arranged on the first shell (1) and protrudes away from the flange plate (3), a third resonance cavity (1031) is formed in the third protrusion (103) and faces the flange plate (3), and an acoustic baffle (1032) is arranged in the third resonance cavity (1031) and extends from the bottom wall of the third resonance cavity (1031) and faces the flange plate (3). The groove (4) is in communication with the third resonance cavity (1031).

4. The muffler of claim 3, wherein A fourth protrusion (104) is arranged on one side of the third protrusion (103) and faces the flange plate (3), a first muffling cavity (1041) is arranged in the fourth protrusion (104) and faces the flange plate (3), and the air inlet of the first muffling cavity (1041) is in communication with the groove (4).

5. The muffler of claim 4, wherein The first muffling cavity (1041) comprises a large cavity (1042) and a small cavity (1043), the small cavity (1043) is arranged close to the air inlet of the first muffling cavity (1041), and a first air outlet (1141) is arranged on the large cavity (1042).

6. The muffler of claim 4, wherein The first shell (1) is further provided with a fifth protrusion (105) protruding away from the flange (3), a second sound-damping cavity (1051) is formed in the fifth protrusion (105) and faces the flange (3), the fifth protrusion (105) is provided with a second air outlet (1151) facing the center of the flange (3), and the air inlet of the second sound-damping cavity (1051) is communicated with the groove (4).

7. The muffler of claim 6, wherein The top end of the sixth protrusion (106) is stepped and comprises a first step surface (1261) and a second step surface (1262), the first step surface (1261) is close to the center of the flange (3) and is higher than the second step surface (1262).

8. The muffler of claim 7, wherein The first shell (1) is provided with a first clearance hole (601) in the center, the first protrusion (101), the third protrusion (103), the sixth protrusion (106) and the fifth protrusion (105) are arranged around the first clearance hole (601) in sequence, and the groove (4) is annular and is arranged around the first clearance hole (601).

9. The muffler of any one of claims 1-8, wherein, The muffler further comprises a second shell (2). The second shell (2) covers the first shell (1), the edge of the second shell (2) is sealingly connected with the edge of the first shell (1), and an expansion cavity (5) is formed between the second shell (2) and the first shell (1).

10. A compressor characterized by, The muffler comprises a flange (3) and the muffler of claim 9.

11. The compressor of claim 10, wherein, The center of the flange (3) is provided with a journal (303) extending towards the compressor sound-damping cavity, the center of the first shell (1) is provided with a first clearance hole (601), the center of the second shell (2) is provided with a second clearance hole (602), the muffler is interference-fitted on the journal (303) through the first clearance hole (601) and the second clearance hole (602), and the edge of the first shell (1) is sealingly connected with the flange (3). The journal (303) is provided with a communication groove (304), and the gas in the expansion cavity (5) can be discharged through the communication groove (304).

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