CN112177887B - Exhaust silencing structure and compressor - Google Patents

Exhaust silencing structure and compressor Download PDF

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Publication number
CN112177887B
CN112177887B CN202011045037.8A CN202011045037A CN112177887B CN 112177887 B CN112177887 B CN 112177887B CN 202011045037 A CN202011045037 A CN 202011045037A CN 112177887 B CN112177887 B CN 112177887B
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China
Prior art keywords
silencing
cavity
side wall
pipe
exhaust
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CN202011045037.8A
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Chinese (zh)
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CN112177887A (en
Inventor
魏会军
刘源泉
徐敏
张问贵
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Publication of CN112177887A publication Critical patent/CN112177887A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0066—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using sidebranch resonators, e.g. Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0083—Pulsation and noise damping means using blow off silencers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/122—Cylinder block

Abstract

The invention provides an exhaust silencing structure and a compressor, wherein the exhaust silencing structure comprises an air cylinder seat and a first silencing pipe, and the air cylinder seat is provided with an exhaust channel and a first silencing cavity; the first silencing pipe is arranged in the first silencing cavity, a first inlet, a first outlet and a plurality of first silencing holes are formed in the side wall of the first silencing pipe, a first cavity is formed in the space between the first silencing pipe and the inner wall of the first silencing cavity, each first silencing hole is communicated with the first cavity, and the exhaust channel is communicated with the first inlet. By adopting the scheme, the refrigerant air flow enters the cavity of the first silencing pipe through the exhaust passage, a part of sound wave of exhaust pulsation noise in the first silencing pipe passes through the first silencing hole, the sound wave enters the first cavity after passing through the first silencing hole, after entering, the part of sound wave can generate air column resonance with the air flow in the first cavity, so that part of sound energy is converted into heat energy to be consumed, and the part of sound wave is reflected back to the cavity to be offset with the incident sound wave, thereby achieving the effects of silencing and reducing noise.

Description

Exhaust silencing structure and compressor
Technical Field
The invention relates to the technical field of compressors, in particular to an exhaust silencing structure and a compressor.
Background
With the improvement of life quality, the demand of a terminal refrigerator market for silent products is more and more strong, and a compressor is used as a core part of a refrigerator and is one of main noise sources causing noise of the refrigerator, so that the vibration and noise reduction of a piston compressor is very important.
The noise source of the piston compressor is mainly low-frequency suction noise, so the main noise improvement related patents of compressor manufacturers mainly improve the suction noise, and related technical solutions rarely exist for exhaust noise.
With the popularization and application of the frequency conversion technology of the piston compressor, the study finds that the middle-high frequency noise of the frequency conversion compressor is also very obvious, and the exhaust noise of the compressor is mainly at the middle-high frequency, so the study on the exhaust noise of the piston compressor is also very necessary.
Among the existing compressor technology, refrigerant gas enters into the cylinder through the muffler of breathing in, then enters into the exhaust runner through the piston compression, again from the exhaust runner entering exhaust muffler, and most simple structure of current exhaust muffler, it is not very obvious to exhaust pulsation noise abatement effect. The exhaust pulsation of the compressor is transmitted to the outer side of the compressor shell through the exhaust pipe, so that the vibration noise of the refrigerator is large, and the noise reduction effect is influenced.
Disclosure of Invention
The invention provides an exhaust silencing structure and a compressor, which are used for reducing exhaust noise of the compressor.
In order to achieve the above object, according to one aspect of the present invention, there is provided an exhaust silencing structure including: a cylinder block having an exhaust passage and a first muffling chamber; the first silencing pipe is arranged in the first silencing cavity, a first inlet, a first outlet and a plurality of first silencing holes are formed in the side wall of the first silencing pipe, a first cavity is formed in the space between the first silencing pipe and the inner wall of the first silencing cavity, each first silencing hole is communicated with the first cavity, and the exhaust channel is communicated with the first inlet.
Further, the first silencing pipe is a corrugated pipe, at least one first annular protrusion is arranged on the side wall of the first silencing pipe, and the first annular protrusion is abutted to the inner wall of the first silencing cavity so as to divide the first cavity into at least two first sub-cavities.
Furthermore, first annular arch includes interconnect's first lateral wall and second lateral wall, first lateral wall with the contained angle has between the second lateral wall, first lateral wall with it has a plurality of first bloops to divide equally on the second lateral wall.
Further, the plurality of first muffling holes in the first side wall are distributed along the circumferential direction of the first side wall, and the plurality of first muffling holes in the second side wall are distributed along the circumferential direction of the second side wall; the first silencing holes in the first side wall and the first silencing holes in the second side wall are arranged in a staggered mode in the circumferential direction of the first silencing pipe.
Furthermore, the side wall of the first silencing tube is provided with two first annular bulges which are arranged at intervals, and the first cavity is divided into three first sub-cavities by the two first annular bulges.
Further, the volumes of the three first sub-cavities are the same; the lengths of the three first sub-cavities are different in the axial direction of the first silencing pipe.
Further, the exhaust silencing structure further includes: the first cover body is arranged at the opening of the first silencing cavity; and the first sealing ring is arranged on one side of the first cover body facing the first silencing pipe.
Further, the cylinder block further has a second sound-deadening chamber and a communication hole, the first outlet is communicated with the communication hole, and the exhaust sound-deadening structure further includes: the second silencing pipe is arranged in the second silencing cavity, a second inlet, a second outlet and a plurality of second silencing holes are formed in the side wall of the second silencing pipe, a second cavity is formed in the space between the second silencing pipe and the inner wall of the second silencing cavity, each second silencing hole is communicated with the second cavity, and the communication hole is communicated with the second inlet.
Further, the second silencing pipe is a corrugated pipe, at least one second annular bulge is arranged on the side wall of the second silencing pipe, and the second annular bulge is abutted to the inner wall of the second silencing cavity so as to divide the second cavity into at least two second sub-cavities.
Furthermore, the side wall of the second silencing pipe is provided with two second annular bulges which are arranged at intervals, the second cavity is divided into three second sub-cavities by the two second annular bulges, and the volumes of the three second sub-cavities are different.
Further, the depth of the first silencing cavity is equal to the length of the first silencing tube, the depth of the second silencing cavity is equal to the length of the second silencing tube, and the depth of the second silencing cavity is smaller than the depth of the first silencing cavity.
According to another aspect of the present invention, there is provided a compressor including the above-described discharge sound deadening structure.
The technical scheme of the invention is applied, and the exhaust silencing structure comprises a cylinder seat and a first silencing pipe, wherein the cylinder seat is provided with an exhaust passage and a first silencing cavity; the first silencing pipe is arranged in the first silencing cavity, a first inlet, a first outlet and a plurality of first silencing holes are formed in the side wall of the first silencing pipe, a first cavity is formed in the space between the first silencing pipe and the inner wall of the first silencing cavity, each first silencing hole is communicated with the first cavity, and the exhaust channel is communicated with the first inlet. By adopting the scheme, the refrigerant airflow enters the cavity of the first silencing pipe through the exhaust passage, a part of sound wave of exhaust pulsation noise in the first silencing pipe passes through the first silencing hole, the sound wave enters the first cavity after passing through the first silencing hole, after entering, a part of sound wave can generate air column resonance with the airflow in the first cavity, so that a part of sound energy is converted into heat energy to be consumed, and a part of sound wave is reflected back to the cavity to be mutually offset with the incident sound wave, thereby achieving the effects of silencing and reducing noise.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows an exploded view of an exhaust silencing structure provided by an embodiment of the present invention;
fig. 2 shows an assembly view of the exhaust silencing structure of fig. 1;
fig. 3 shows a perspective view of the first silencer duct of fig. 1;
fig. 4 shows a plan view of the first silencer duct of fig. 3;
fig. 5 shows a perspective view of the second silencer duct of fig. 1;
fig. 6 shows a plan view of the second silencer duct of fig. 5.
Wherein the figures include the following reference numerals:
10. a cylinder block; 11. an exhaust passage; 12. a first muffling chamber; 13. a second muffling chamber; 14. a communicating hole; 20. a first muffling tube; 21. a first muffling hole; 22. a first cavity; 23. a first annular projection; 24. a first side wall; 25. a second side wall; 31. a first cover body; 32. a first seal ring; 33. a first fastener; 34. a second cover body; 35. a second seal ring; 36. a second fastener; 40. a second muffler pipe; 41. a second muffling hole; 42. a second cavity; 43. a second annular protrusion.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 1 to 6, an embodiment of the present invention provides an exhaust silencing structure including: a cylinder block 10, the cylinder block 10 having an exhaust passage 11 and a first muffling chamber 12; the first muffling pipe 20 is arranged in the first muffling chamber 12, a first inlet, a first outlet and a plurality of first muffling holes 21 are formed in the side wall of the first muffling pipe 20, a first cavity 22 is formed in the space between the first muffling pipe 20 and the inner wall of the first muffling chamber 12, each first muffling hole 21 is communicated with the first cavity 22, and the exhaust passage 11 is communicated with the first inlet.
By adopting the scheme, the refrigerant airflow enters the cavity of the first silencing pipe 20 through the exhaust channel 11, a part of sound wave of exhaust pulsating noise in the first silencing pipe 20 passes through the first silencing hole 21, the sound wave enters the first cavity 22 after passing through the first silencing hole 21, after entering, a part of sound wave can generate air column resonance with the airflow in the first cavity 22, so that a part of sound energy is converted into heat energy to be consumed, and a part of sound wave is reflected back into the cavity to be mutually offset with the incident sound wave, thereby achieving the effects of silencing and reducing noise.
Specifically, the first muffling tube 20 is a corrugated tube, the side wall of the first muffling tube 20 has at least one first annular protrusion 23, and the first annular protrusion 23 abuts against the inner wall of the first muffling chamber 12 to divide the first cavity 22 into at least two first sub-chambers. The first cavity 22 is divided into at least two first sub-cavities, and sound waves passing through the first sound-deadening holes 21 can enter different first sub-cavities, so that the sound-deadening effect can be further improved.
Optionally, the first annular projection 23 is in interference fit with the inner wall of the first sound-deadening chamber 12. The shape of the first muffling hole 21 may be circular, rhombic, rectangular, triangular, or the like. The diameters of the first silencing holes 21 on different wall surfaces can be set to be different, and the effect of controlling the diameter to be less than 1mm is good.
In the present embodiment, the first annular protrusion 23 includes a first sidewall 24 and a second sidewall 25 connected to each other, an included angle is formed between the first sidewall 24 and the second sidewall 25, and a plurality of first muffling holes 21 are distributed on the first sidewall 24 and the second sidewall 25. Thus, the first muffling holes 21 are distributed at different positions, so that the gas flow and the sound wave throughput can be improved, and the muffling effect can be improved.
Further, the plurality of first muffling holes 21 on the first side wall 24 are distributed along the circumferential direction of the first side wall 24, and the plurality of first muffling holes 21 on the second side wall 25 are distributed along the circumferential direction of the second side wall 25; the plurality of first muffling holes 21 of the first side wall 24 and the plurality of first muffling holes 21 of the second side wall 25 are arranged to be offset in the circumferential direction of the first muffling tube 20. This avoids interference of the air flow over the first side wall 24 and the air flow over the second side wall 25.
In the present embodiment, the first silencing tube 20 has two first annular protrusions 23 spaced apart from each other on a side wall thereof, and the two first annular protrusions 23 divide the first cavity 22 into three first sub-cavities. The volumes of the three first sub-cavities can be the same or different.
The first cavity 22 is divided into three sections of mutually independent closed spaces, and after the sound waves enter, partial sound waves and air flow in the cavity generate air column resonance, so that partial sound energy is converted into heat energy to be consumed; part of sound waves are reflected back into the cavity and offset with the incident sound waves, the structure has the silencing effect of an impedance composite type silencer, and wider silencing frequency can be achieved by designing different apertures and different distances between the exhaust cavity and the silencing pipe.
Further, the volumes of the three first sub-cavities are the same; the lengths of the three first sub-chambers are all different in the axial direction of the first muffling tube 20. Therefore, the noise of different frequencies can be eliminated by the different first sub-cavities, and the frequency range of the noise elimination is improved.
In this embodiment, the exhaust silencing structure further includes: a first cover 31 disposed at an opening of the first muffling chamber 12; the first seal ring 32 is provided on the first cover 31 on the side facing the first muffler pipe 20. The upper portion of the first muffling cavity 12 has an opening for taking and placing the first muffling tube 20, and the opening of the upper portion of the first muffling cavity 12 can be sealed by the first cover 31. The first sealing ring 32 can improve the sealing effect and avoid leakage.
Alternatively, the inner wall of the first muffling chamber 12 has a first step, the lower side of the first sealing ring 32 abuts against the first step and the first muffling tube 20, and the upper side of the first sealing ring 32 abuts against the first cover 31. The exhaust silencing structure further includes a first fastening member 33, and the first fastening member 33 is connected to the bottom wall of the first silencing chamber 12 through the first cover body 31. The first fastening member 33 may be a screw.
In the present embodiment, the cylinder block 10 further has a second sound-deadening chamber 13 and a communication hole 14, the first outlet port communicates with the communication hole 14, and the exhaust gas sound-deadening structure further includes: and a second muffling pipe 40 disposed in the second muffling chamber 13, wherein the second muffling pipe 40 has a second inlet, a second outlet and a plurality of second muffling holes 41 on a side wall thereof, a second cavity 42 is formed in a space between the second muffling pipe 40 and an inner wall of the second muffling chamber 13, each of the second muffling holes 41 is communicated with the second cavity 42, and the communication hole 14 is communicated with the second inlet. The silencing principles of the second silencing tube 40 and the second silencing chamber 13 are the same as those of the first silencing tube 20 and the first silencing chamber 12. Through the arrangement, the exhaust silencing effect can be further improved, and the noise is reduced.
Alternatively, the communication hole 14 includes a first hole section and a second hole section communicating with each other, the first hole section having a diameter larger than that of the second hole section, the first hole section communicating with the first outlet, and the second hole section communicating with the second inlet. In this way, the flow area of the gas flow changes during the flow through the communication hole 14, and the silencing effect can be further achieved.
In this embodiment, the second sound-deadening tube 40 is a corrugated tube, the side wall of the second sound-deadening tube 40 has at least one second annular bulge 43, and the second annular bulge 43 abuts against the inner wall of the second sound-deadening chamber 13 to divide the second cavity 42 into at least two second sub-chambers. This can further improve the sound deadening effect.
Specifically, the side wall of the second sound-deadening tube 40 is provided with two second annular bulges 43 arranged at intervals, the two second annular bulges 43 divide the second cavity 42 into three second sub-cavities, and the volumes of the three second sub-cavities are all different. Therefore, the different second sub-cavities can eliminate the noises with different frequencies, so that the silencing frequencies of the two silencing cavities are complementary, and the silencing frequency range is enlarged.
Further, the volume of the second sub-chamber is different from the volume of the first sub-chamber, which can further increase the range of the sound attenuation frequency. The volume of the cavity in this solution can also be understood as volume.
In the present embodiment, the depth of the first muffling chamber 12 is equal to the length of the first muffling tube 20, the depth of the second muffling chamber 13 is equal to the length of the second muffling tube 40, and the depth of the second muffling chamber 13 is smaller than the depth of the first muffling chamber 12. Through the arrangement, the first silencing cavity 12 and the second silencing cavity 13 can eliminate noises with different frequencies, and the silencing effect is improved. For example, the depth of the first sound-deadening chamber is 20mm, and the depth of the second sound-deadening chamber is 18mm.
In this embodiment, the exhaust silencing structure further includes: a second cover 34 disposed at the opening of the second muffling chamber 13; the second seal ring 35 is provided on the second cover 34 on the side facing the second muffler pipe 40. The upper part of the second muffling cavity 13 is provided with an opening for taking and placing the second muffling tube 40, and the opening of the upper part of the second muffling cavity 13 can be blocked by the second cover 34. The sealing effect can be improved by arranging the second sealing ring 35, and leakage is avoided.
Alternatively, the inner wall of the second muffling chamber 13 has a second step, the lower side of the second sealing ring 35 abuts against the second step and the second muffling tube 40, and the upper side of the second sealing ring 35 abuts against the second cover 34. The exhaust silencing structure further includes a second fastening member 36, and the second fastening member 36 is connected to the bottom wall of the second silencing chamber 13 through the second cover body 34. The second fastener 36 may be a screw.
Another embodiment of the present invention provides a compressor, which includes the above exhaust silencing structure. By adopting the scheme, the exhaust silencing effect of the compressor is improved, and the noise of the compressor is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An exhaust silencing structure, comprising:
a cylinder block (10), the cylinder block (10) having an exhaust passage (11) and a first muffling chamber (12);
the first silencing pipe (20) is arranged in the first silencing cavity (12), a first inlet, a first outlet and a plurality of first silencing holes (21) are formed in the side wall of the first silencing pipe (20), a first cavity (22) is formed in the space between the first silencing pipe (20) and the inner wall of the first silencing cavity (12), each first silencing hole (21) is communicated with the first cavity (22), and the exhaust channel (11) is communicated with the first inlet;
the first silencing pipe (20) is a corrugated pipe, at least one first annular bulge (23) is arranged on the side wall of the first silencing pipe (20), and the first annular bulge (23) is abutted with the inner wall of the first silencing cavity (12) so as to divide the first cavity (22) into at least two first sub-cavities;
the side wall of the first silencing pipe (20) is provided with two first annular bulges (23) which are arranged at intervals, and the first cavity (22) is divided into three first sub-cavities by the two first annular bulges (23);
the volumes of the three first sub-cavities are the same; the lengths of the three first sub-cavities are different in the axial direction of the first silencing pipe (20).
2. Exhaust gas silencing structure according to claim 1, wherein said first annular protrusion (23) comprises a first side wall (24) and a second side wall (25) connected to each other, said first side wall (24) and said second side wall (25) having an included angle therebetween, said first side wall (24) and said second side wall (25) having a plurality of first silencing holes (21) evenly distributed thereon.
3. Exhaust gas silencing structure according to claim 2, wherein said plurality of first silencing holes (21) in said first side wall (24) are distributed along a circumferential direction of said first side wall (24), and said plurality of first silencing holes (21) in said second side wall (25) are distributed along a circumferential direction of said second side wall (25); the plurality of first muffling holes (21) in the first side wall (24) and the plurality of first muffling holes (21) in the second side wall (25) are arranged in a staggered manner in the circumferential direction of the first muffling tube (20).
4. The exhaust silencing structure according to claim 1, further comprising:
a first cover body (31) arranged at the opening of the first silencing cavity (12);
and a first seal ring (32) provided on the side of the first cover (31) facing the first muffler pipe (20).
5. The exhaust gas silencing structure according to any one of claims 1 to 4, wherein said cylinder block (10) further has a second silencing chamber (13) and a communication hole (14), said first outlet port and said communication hole (14) communicating, said exhaust gas silencing structure further comprising:
the second silencing pipe (40) is arranged in the second silencing cavity (13), a second inlet, a second outlet and a plurality of second silencing holes (41) are formed in the side wall of the second silencing pipe (40), a second cavity (42) is formed in the space between the second silencing pipe (40) and the inner wall of the second silencing cavity (13), each second silencing hole (41) is communicated with the second cavity (42), and the communication hole (14) is communicated with the second inlet.
6. The exhaust silencing structure of claim 5, wherein said second silencing tube (40) is a bellows, said second silencing tube (40) having at least one second annular projection (43) on a side wall thereof, said second annular projection (43) abutting an inner wall of said second silencing chamber (13) to divide said second cavity (42) into at least two second subchambers.
7. The exhaust silencing structure according to claim 6, wherein said second silencing tube (40) has two spaced second annular protrusions (43) on its side wall, and said two second annular protrusions (43) divide said second cavity (42) into three second sub-cavities, each of which has a different volume.
8. The exhaust silencing structure of claim 5, wherein a depth of said first silencing chamber (12) is equal to a length of said first silencing pipe (20), a depth of said second silencing chamber (13) is equal to a length of said second silencing pipe (40), and a depth of said second silencing chamber (13) is smaller than a depth of said first silencing chamber (12).
9. A compressor characterized by comprising the exhaust gas silencing structure of any one of claims 1 to 8.
CN202011045037.8A 2020-09-28 2020-09-28 Exhaust silencing structure and compressor Active CN112177887B (en)

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CN112177887B true CN112177887B (en) 2022-10-28

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Publication number Priority date Publication date Assignee Title
KR102447345B1 (en) 2021-01-22 2022-09-26 엘지전자 주식회사 Reciprocating compressor
CN113982946B (en) * 2021-10-28 2023-02-21 广东美芝制冷设备有限公司 Compressor and refrigeration equipment

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Publication number Priority date Publication date Assignee Title
FR2288217A1 (en) * 1974-10-14 1976-05-14 Martinez Ginez Exhaust silencer for combustion engine - is built up from two concentric pipes made up from rings
JPS60247005A (en) * 1984-05-19 1985-12-06 Imakou Seisakusho:Kk Silencer for internal-combustion engine
CN102168665A (en) * 2011-05-03 2011-08-31 芜湖欧宝机电有限公司 Cylinder seat of piston type refrigerating compressor
KR101560696B1 (en) * 2013-12-24 2015-10-15 동부대우전자 주식회사 Compressor and discharging muffler thereof

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