Silencer

Abstract

The utility model relates to a silencer, and belongs to the technical field of silencers, the silencer comprises a silencing cavity assembly, an air inlet pipe and an exhaust pipe, the silencing cavity assembly comprises a shell and at least one silencing pipe arranged in the shell, one end of the air inlet pipe and one end of the exhaust pipe are both communicated with the shell, at least one kidney-shaped hole is formed in the silencing pipe, and the waist-shaped hole is communicated with the shell. The cross sectional area of the silencing pipe is smaller than that of the air inlet pipe and that of the exhaust pipe. According to the silencer, sound wave reflection is conducted through sudden change of the cross sectional area between the silencing pipe and the air inlet pipe and the cross sectional area between the silencing pipe and the exhaust pipe to achieve sound wave attenuation so as to achieve the noise reduction purpose, the kidney-shaped holes are formed to communicate with the inner cavity of the shell, and compared with round holes, the resistance to airflow can be reduced; the possibility that the stability of the compressor becomes poor due to too large pressure drop caused by sudden change of the cross sectional area of the hush pipe is avoided, the increase of energy consumption is avoided, meanwhile, the increase of heat productivity is avoided, and the possibility that the service life is shortened due to fatigue of parts such as a bearing is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of mufflers, and in particular to a muffler. Background Art

[0002] During the operation of the screw compressor, the compression chamber and the suction and exhaust chamber are periodically connected, resulting in unstable gas flow, causing air flow pulsation in the suction and exhaust chambers and generating large noise. Nowadays, small-volume, low-cost compressors are becoming more and more popular, and high-speed compressors have emerged. However, the increase in compressor speed will simultaneously increase the vibration noise in the suction and exhaust chambers. When the compressor is under-compressed or over-compressed, the air flow pulsation generated by the high-speed compressor will induce more serious pneumatic noise problems. Utility Model Content

[0003] The present application provides a muffler to solve the high-frequency air flow pulsation noise caused by the periodic connection of the exhaust high pressure in the compressor to the exhaust port.

[0004] The present application provides a silencer, including a silencer chamber assembly, an intake pipe and an exhaust pipe. The silencer chamber assembly includes a shell and at least one silencer pipe arranged in the shell. One end of the intake pipe and the exhaust pipe are both connected to the shell. At least one waist-shaped hole is provided on the silencer pipe. The cross-sectional area of ​​the silencer pipe is smaller than the cross-sectional area of ​​the intake pipe and the cross-sectional area of ​​the exhaust pipe, respectively.

[0005] According to the silencer of the present application, the cross-sectional area of ​​the silencer pipe is set to be smaller than the cross-sectional area of ​​the intake pipe and the cross-sectional area of ​​the exhaust pipe respectively, and the sudden change in the cross-sectional area between the silencer pipe and the intake pipe and the exhaust pipe is used to reflect the sound waves to achieve sound wave attenuation to achieve the purpose of noise reduction, thereby attenuating the airflow pulsation amplitude and reducing the aerodynamic noise induced by the airflow pulsation. However, the sudden change in cross-sectional area will also lead to an increase in resistance, which will increase the pressure drop of the compressor. By setting a waist-shaped hole connected to the inner cavity of the shell, a resonance cavity can be formed with the shell by the waist-shaped hole, and resonance sound absorption can be utilized. Compared with the round hole, the waist-shaped hole can reduce the resistance to the airflow, avoid the possibility of excessive pressure drop caused by the sudden change in the cross-sectional area of ​​the silencer pipe, which will deteriorate the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and shortening their lifespan.

[0006] According to the silencer of the present application, the shell includes a first end and a second end arranged along a first direction, the first end is connected to the intake pipe, the second end is connected to the exhaust pipe, the silencer pipe extends along the first direction, and the waist-shaped hole extends along the first direction.

[0007] According to the silencer of the present application, the silencer pipe is arranged to extend in the same direction as the shell, and the waist-shaped hole is arranged to extend in the same direction as the shell, so that the pressure loss can be reduced, and the possibility of the stability of the compressor being deteriorated due to excessive pressure drop can be minimized as much as possible, thereby avoiding an increase in energy consumption, and at the same time avoiding an increase in heat generation, and avoiding the possibility of fatigue of parts such as bearings and resulting in a shortened life.

[0008] Optionally, there are multiple waist-shaped holes, and the multiple waist-shaped holes are arranged at intervals along the circumference of the muffler.

[0009] According to the silencer of the present application, multiple waist-shaped holes affect the flow of gas in the silencer pipe in the circumferential direction, and can decelerate the airflow in multiple directions in the circumferential direction, thereby improving the noise reduction effect, so that the noise reduction requirements can be met without setting the diameter of the silencer pipe too small.

[0010] Optionally, when projected in the radial direction of the shell, the projections of the intake pipe and the muffler pipe have a first overlapping portion, and the projections of the exhaust pipe and the muffler pipe have a second overlapping portion.

[0011] According to the muffler of the present application, the projection of the intake pipe and the muffler has a first overlapping portion, and the projection of the exhaust pipe and the muffler has a second overlapping portion, which can guide the airflow and facilitate the airflow to enter the muffler through the intake pipe and facilitate the airflow to enter the exhaust pipe through the muffler.

[0012] Optionally, there are multiple silencer pipes, and the multiple silencer pipes are distributed at intervals along the circumferential direction of the shell.

[0013] According to the silencer of the present application, a plurality of silencer pipes are arranged and spaced apart along the circumferential direction of the shell, so as to better guide the gas when it moves in the shell, avoid the generation of vortex when the gas flows, and thus further reduce the pressure loss.

[0014] Optionally, the first overlapping portion of each silencer pipe and the intake pipe is equal, and the second overlapping portion of each silencer pipe and the exhaust pipe is equal.

[0015] According to the silencer of the present application, the first overlapping part between each silencer pipe and the intake pipe is equal, and the second overlapping part between each silencer pipe and the exhaust pipe is equal, so the position setting of the silencer pipe can be simplified, so that the silencer and noise reduction effects at various points of the airflow are similar, avoiding the polarization caused by the airflow concentrating at a certain point, which weakens the noise reduction effect.

[0016] Optionally, the area of ​​the first overlapping portion is S1, the cross-sectional area of ​​the air intake pipe is S2, nS1>0.4S2, wherein n is a positive integer greater than or equal to 1.

[0017] According to the silencer of the present application, such a configuration can also reduce the resistance to the airflow, avoid the possibility of a sudden change in the cross-sectional area of ​​the silencer pipe causing excessive pressure drop and deteriorating the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and resulting in a reduced lifespan.

[0018] Optionally, the area of ​​the second overlapping portion is S3, the cross-sectional area of ​​the exhaust pipe is S4, nS3>0.4S4, wherein n is a positive integer greater than or equal to 1.

[0019] According to the silencer of the present application, such a configuration can also reduce the resistance to the airflow, avoid the possibility of a sudden change in the cross-sectional area of ​​the silencer pipe causing excessive pressure drop and deteriorating the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and resulting in a reduced lifespan.

[0020] According to the silencer of the present application, the waist-shaped hole includes a first sub-hole and two second sub-holes respectively connected to the two ends of the length direction of the first sub-hole, the first sub-hole is rectangular, the second sub-hole is semicircular, the radius r of the second sub-hole ranges from 16 to 29 mm, and the length L2 of the first sub-hole ranges from 50 to 80 mm.

[0021] According to the silencer of the present application, the larger the radius r of the second sub-hole is, the ability to generate resonance will gradually decrease, and the smaller the radius r of the second sub-hole is, the noise reduction frequency of the compressor will shift to a low frequency. This is mainly because when the radius r of the second sub-hole decreases, the perforation area will decrease and the perforation rate will decrease, thereby causing the resonance frequency to shift to a low frequency. Therefore, it is necessary to set a suitable r size; the length L2 of the first sub-hole is limited by the length of the silencer pipe. The larger the length L2 of the first sub-hole is, the shorter the life of the silencer pipe will be and the more fatigue of the silencer machine will be. The smaller the length L2 of the first sub-hole is, the more it will affect the perforation rate, thereby causing the resonance frequency to shift to a low frequency. Therefore, it is necessary to set a suitable L2 size.

[0022] Optionally, the length of the shell ranges from 190 to 230 mm.

[0023] According to the silencer of the present application, increasing the length of the shell can enhance the effect of silencing and reducing noise, but too large a length of the shell will increase the overall volume of the silencer, thereby increasing the overall volume occupancy. Therefore, a suitable length of the shell needs to be set. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 A cross-sectional view of a silencer with a single silencer pipe provided in an embodiment of the present application;

[0028] Figure 2 A schematic structural diagram of a silencer with a single silencer pipe provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of a muffler with multiple muffler pipes provided in an embodiment of the present application;

[0030] Figure 4 A schematic cross-sectional view of a muffler with multiple muffler pipes provided in an embodiment of the present application;

[0031] Figure 5 Another cross-sectional schematic diagram of a silencer with multiple silencer pipes provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] The silencer chamber assembly 10 , the shell 11 , the silencer pipe 12 , the waist-shaped hole 121 , the air inlet pipe 20 , the exhaust pipe 30 , and the flange 40 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0037] like Figure 1 and Figure 2 As shown, the silencer according to the embodiment of the present application includes a silencer chamber assembly 10, an intake pipe 20 and an exhaust pipe 30. The silencer chamber assembly 10 includes a shell 11 and at least one silencer pipe 12 arranged in the shell 11. One end of the intake pipe 20 and the exhaust pipe 30 are both connected to the shell 11. At least one waist-shaped hole 121 is provided on the silencer pipe 12. The cross-sectional area of ​​the silencer pipe 12 is smaller than the cross-sectional area of ​​the intake pipe 20 and the cross-sectional area of ​​the exhaust pipe 30, respectively.

[0038] In detail, the cross-sectional area of ​​the silencer 12 is smaller than the cross-sectional area of ​​the intake pipe 20 and the cross-sectional area of ​​the exhaust pipe 30, respectively. Thus, when the airflow enters the silencer 12 through the intake pipe 20, the sudden change in area can reflect the airflow for sound waves to achieve the effect of sound wave attenuation, thereby realizing noise reduction. When the airflow flows into the exhaust pipe 30 through the silencer 12, the airflow expands, thereby realizing noise reduction. The waist-shaped hole 121 is connected to the inner cavity of the shell 11, and a resonance cavity can be formed by the waist-shaped hole 121 and the shell 11. By utilizing resonance sound absorption, the waist-shaped hole 121 can reduce the resistance to the airflow and the pressure drop compared to the round hole, thereby avoiding the increase in energy consumption, and at the same time avoiding the increase in heat generation, and avoiding the possibility of fatigue of parts such as bearings and shortening the life.

[0039] The cross-sectional shape of the housing 11 includes but is not limited to circular, square or rectangular; the cross-sectional shape of the muffler 12 includes but is not limited to circular, square or rectangular. In a specific embodiment, the cross-sectional shape of the housing 11 is circular, the cross-sectional shape of the muffler 12 is circular, the cross-sectional shape of the air intake pipe 20 is circular, the radius of the air intake pipe 20 is R0, and the radius of the air intake pipe 20 is greater than the radius of the muffler 12.

[0040] In addition, when setting the specific size of the silencer, the diameter d of the silencer pipe 12 should be increased as much as possible to reduce the fluid flow rate and reduce the pressure loss. At the same time, the diameter D of the shell 11 should be increased as much as possible to increase the expansion ratio and enhance the noise reduction effect of the silencer. The length of the shell 11 is limited by the length of the compressor unit, so it needs to be matched accordingly.

[0041] In addition, at least one silencer pipe 12 disposed in the shell 11 means that the number of the silencer pipes 12 is one or more, and at least one waist-shaped hole 121 is disposed on the silencer pipe 12, which means that the number of the waist-shaped holes 121 is one or more.

[0042] According to the silencer of the embodiment of the present application, the cross-sectional area of ​​the silencer 12 is set to be smaller than the cross-sectional area of ​​the intake pipe 20 and the cross-sectional area of ​​the exhaust pipe 30, respectively, and the cross-sectional area mutation between the silencer 12 and the intake pipe 20 and the exhaust pipe 30 is used to reflect sound waves to achieve sound wave attenuation to achieve the purpose of noise reduction, thereby attenuating the airflow pulsation amplitude and reducing the aerodynamic noise induced by the airflow pulsation. However, the sudden change in cross-sectional area will also lead to an increase in resistance, thereby increasing the pressure drop of the compressor. Compared with the round hole, the waist-shaped hole 121 can reduce the resistance to the airflow, avoid the possibility of excessive pressure drop caused by the sudden change in the cross-sectional area of ​​the silencer 12, which will deteriorate the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and shortening their lifespan.

[0043] like Figure 3As shown, in some application scenarios, a flange 40 is provided at one end of the inlet pipe 20 away from the housing 11, and a flange 40 is also provided at one end of the exhaust pipe 30 away from the housing 11, so as to facilitate fixing with other structures. Among them, the muffler can be arranged inside the compressor or outside the compressor; when the muffler is arranged outside, the size of the compressor can be reduced while ensuring the refrigeration capacity.

[0044] According to the silencer of the embodiment of the present application, the shell 11 includes a first end and a second end arranged along a first direction, the first end is connected to the intake pipe 20, and the second end is connected to the exhaust pipe 30, the silencer pipe 12 extends along the first direction, and the waist-shaped hole 121 extends along the first direction.

[0045] According to the silencer of the embodiment of the present application, the silencer pipe 12 is arranged to extend in the same direction as the shell 11, and the waist-shaped hole 121 is extended in the same direction as the shell 11, which can reduce the pressure loss and minimize the possibility of poor stability of the compressor due to excessive pressure drop, thereby avoiding an increase in energy consumption and an increase in heat generation, and avoiding the possibility of fatigue of parts such as bearings and resulting in a shortened life.

[0046] It should be noted that the first direction is only for the convenience of describing the introduced direction, and can be any direction, as long as the extension directions of the silencer 12, the waist-shaped hole 121 and the shell 11 are in the same direction.

[0047] like Figure 4 and Figure 5 As shown, in some embodiments, there are multiple waist-shaped holes 121 , and the multiple waist-shaped holes 121 are arranged at intervals along the circumference of the muffler 12 .

[0048] According to the silencer of the embodiment of the present application, the multiple waist-shaped holes 121 affect the flow of gas in the silencer pipe 12 in the circumferential direction, and can decelerate the airflow in multiple directions in the circumferential direction, thereby improving the noise reduction effect, so that the noise reduction requirements can be met without setting the diameter of the silencer pipe 12 too small.

[0049] In some embodiments, when projected in the radial direction of the housing 11 , the projections of the intake pipe 20 and the muffler pipe 12 have a first overlapping portion, and the projections of the exhaust pipe 30 and the muffler pipe 12 have a second overlapping portion.

[0050] According to the silencer of the embodiment of the present application, the projections of the intake pipe 20 and the silencer 12 have a first overlapping portion, and the projections of the exhaust pipe 30 and the silencer 12 have a second overlapping portion, which can guide the airflow and facilitate the airflow to enter the silencer 12 through the intake pipe 20 and facilitate the airflow to enter the exhaust pipe 30 through the silencer 12, thereby reducing the resistance to the airflow, reducing the pressure drop, avoiding an increase in energy consumption, and at the same time avoiding an increase in heat, and avoiding the possibility of fatigue of parts such as bearings and resulting in a reduced lifespan.

[0051] like Figure 3 As shown, in some embodiments, there are multiple silencer pipes 12 , and the multiple silencer pipes 12 are distributed at intervals along the circumferential direction of the shell 11 .

[0052] According to the silencer of the embodiment of the present application, a plurality of silencer pipes 12 are arranged and spaced apart along the circumferential direction of the shell 11, so as to better guide the gas when it moves in the shell 11, avoid the generation of vortex when the gas flows, and thus further reduce the pressure loss.

[0053] It should be noted that the number of the silencer pipes 12 can be set as needed, for example, two, three, four, five and six. Too many silencer pipes 12 are not easy to install on the one hand, and on the other hand, they will also reduce the cross-sectional size of each silencer pipe 12, and will also cause pressure drop at the same time. Therefore, it is necessary to set a suitable number. In a specific embodiment, the number of silencer pipes 12 is five. In this embodiment, the noise reduction capabilities at the base frequency (300HZ) and the first 4 times (1200HZ) of the airflow pulsation excitation are both more than 10dB, and even more than 20dB at the base frequency and 2 times (600HZ), which can effectively reduce the aerodynamic noise induced by airflow pulsation.

[0054] In some embodiments, the first overlapping portion of each muffler pipe 12 and the intake pipe 20 is equal, and the second overlapping portion of each muffler pipe 12 and the exhaust pipe 30 is equal.

[0055] According to the silencer of the embodiment of the present application, the first overlapping part of each silencer pipe 12 and the intake pipe 20 is equal, and the second overlapping part of each silencer pipe 12 and the exhaust pipe 30 is equal, which can simplify the position setting of the silencer pipe 12 so that the silencer and noise reduction effects at various points of the airflow are similar, avoiding the polarization caused by the airflow concentrating at a certain point, which weakens the noise reduction effect.

[0056] In some embodiments, the area of ​​the first overlapping portion is S1, the cross-sectional area of ​​the intake pipe 20 is S2, nS1>0.4S2, where n is a positive integer greater than or equal to 1.

[0057] Among them, n is the number of the silencer pipes 12. In a specific embodiment, when the number of the silencer pipes 12 is 1, n is 1; when the number of the silencer pipes 12 is 2, n is 2; when the number of the silencer pipes 12 is 3, n is 3, and so on.

[0058] According to the silencer of the embodiment of the present application, such a configuration can also reduce the resistance to the airflow, avoid the possibility of a sudden change in the cross-sectional area of ​​the silencer pipe 12 causing excessive pressure drop and deteriorating the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and resulting in a reduced lifespan.

[0059] In some embodiments, the area of ​​the second overlapping portion is S3, the cross-sectional area of ​​the exhaust pipe 30 is S4, nS3>0.4S4, where n is a positive integer greater than or equal to 1.

[0060] Among them, n is the number of the silencer pipes 12. In a specific embodiment, when the number of the silencer pipes 12 is 1, n is 1; when the number of the silencer pipes 12 is 2, n is 2; when the number of the silencer pipes 12 is 3, n is 3, and so on.

[0061] According to the silencer of the embodiment of the present application, such a configuration can also reduce the resistance to the airflow, avoid the possibility of a sudden change in the cross-sectional area of ​​the silencer pipe 12 causing excessive pressure drop and deteriorating the stability of the compressor, avoid an increase in energy consumption, and at the same time avoid an increase in heat generation, and avoid the possibility of fatigue of parts such as bearings and resulting in a reduced lifespan.

[0062] According to the silencer of the embodiment of the present application, the waist-shaped hole 121 includes a first sub-hole and two second sub-holes respectively connected to the two ends of the length direction of the first sub-hole, the first sub-hole is rectangular, the second sub-hole is semicircular, the radius r of the second sub-hole ranges from 16 to 29 mm, and the length L2 of the first sub-hole ranges from 50 to 80 mm.

[0063] According to the silencer of the embodiment of the present application, the larger the radius r of the second sub-hole is, the ability to generate resonance will gradually decrease, and the smaller the radius r of the second sub-hole is, the noise reduction frequency of the compressor will shift to a low frequency. This is mainly because when the radius r of the second sub-hole decreases, the perforation area will decrease and the perforation rate will decrease, thereby causing the resonance frequency to shift to a low frequency. Therefore, it is necessary to set a suitable r size; the length L2 of the first sub-hole is limited by the length of the silencer pipe 12. The larger the length L2 of the first sub-hole is, the shorter the life of the silencer pipe 12 will be, and the increased machine fatigue of the silencer will be. The smaller the length L2 of the first sub-hole is, the more it will affect the perforation rate, thereby causing the resonance frequency to shift to a low frequency. Therefore, it is necessary to set a suitable L2 size.

[0064] Among them, the radius r of the second sub-hole can be 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm and 29mm.

[0065] The length L2 of the first sub-hole can be 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm and 80mm, etc.

[0066] In some embodiments, the length of the housing 11 ranges from 190 to 230 mm.

[0067] According to the silencer of the embodiment of the present application, increasing the length of the shell 11 can enhance the effect of silencing and reducing noise. However, if the length of the shell 11 is too large, the overall volume of the silencer will be increased, thereby increasing the overall volume occupancy. Therefore, it is necessary to set a suitable length of the shell 11.

[0068] Among them, the length of the shell 11 can be 190mm, 191mm, 192mm, 193mm, 194mm, 195mm, 196mm, 197mm, 198mm, 199mm, 200mm, 201mm, 202mm, 203mm, 204mm, 205mm, 206mm, 207mm, 208mm, 209mm, 210mm, 211mm, 212mm, 213mm, 214mm, 215mm, 216mm, 217mm, 218mm, 219mm, 220mm, 221mm, 222mm, 223mm, 224mm, 225mm, 226mm, 227mm, 228mm, 229mm and 230mm, etc.

[0069] In addition, the distance between the waist-shaped hole 121 and the first end of the shell 11 is L1, and the distance between the waist-shaped hole 121 and the second end of the shell 11 is L3. As L1 decreases and L3 increases, the insertion depths of L1 and L3 gradually approach, and the two noise reduction peak frequencies approach each other, which helps to improve the noise reduction effect in the local area.

[0070] In some embodiments, the ratio of the area of ​​the waist-shaped hole 121 to the area of ​​the inner surface of the housing 11 is 11% to 22%, for example, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21% and 22%.

[0071] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0072] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0073] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A muffler for a compressor, characterized in that: It includes a silencer chamber assembly, an air intake pipe and an exhaust pipe. The silencer chamber assembly includes a shell and at least one silencer pipe arranged in the shell. One end of the air intake pipe and the exhaust pipe are both connected to the shell. At least one waist-shaped hole is provided on the silencer pipe. The cross-sectional area of ​​the silencer pipe is smaller than the cross-sectional area of ​​the air intake pipe and the cross-sectional area of ​​the exhaust pipe.

2. The muffler according to claim 1, characterized in that: The shell includes a first end and a second end arranged along a first direction, the first end is communicated with the air intake pipe, the second end is communicated with the exhaust pipe, the muffler extends along the first direction, and the waist-shaped hole extends along the first direction.

3. The muffler according to claim 2, characterized in that: There are multiple waist-shaped holes, and the multiple waist-shaped holes are arranged at intervals along the circumference of the muffler pipe.

4. The muffler according to claim 2, characterized in that: Projected in the radial direction of the shell, the projections of the intake pipe and the muffler have a first overlapping portion, and the projections of the exhaust pipe and the muffler have a second overlapping portion.

5. The muffler according to claim 4, characterized in that: There are multiple silencer pipes, and the multiple silencer pipes are distributed at intervals along the circumferential direction of the shell.

6. The muffler according to claim 5, characterized in that: The first overlapping portion between each of the muffler pipes and the intake pipe is equal, and the second overlapping portion between each of the muffler pipes and the exhaust pipe is equal.

7. The muffler according to claim 4, characterized in that: The area of ​​the first overlapping portion is S1, the cross-sectional area of ​​the intake pipe is S2, nS1>0.4S2, wherein n is a positive integer greater than or equal to 1.

8. The muffler according to claim 4, characterized in that: The area of ​​the second overlapping portion is S3, the cross-sectional area of ​​the exhaust pipe is S4, nS3>0.4S4, wherein n is a positive integer greater than or equal to 1.

9. The muffler according to claim 1, characterized in that: The waist-shaped hole includes a first sub-hole and two second sub-holes respectively connected to the two ends of the first sub-hole in the length direction. The first sub-hole is rectangular, the second sub-hole is semicircular, the radius r of the second sub-hole ranges from 16 to 29 mm, and the length L2 of the first sub-hole ranges from 50 to 80 mm.

10. The muffler according to claim 9, characterized in that The length of the shell is in the range of 190 to 230 mm.

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