KR19990017346A - Suction Muffler in Hermetic Reciprocating Compressor - Google Patents
Suction Muffler in Hermetic Reciprocating Compressor Download PDFInfo
- Publication number
- KR19990017346A KR19990017346A KR1019970040249A KR19970040249A KR19990017346A KR 19990017346 A KR19990017346 A KR 19990017346A KR 1019970040249 A KR1019970040249 A KR 1019970040249A KR 19970040249 A KR19970040249 A KR 19970040249A KR 19990017346 A KR19990017346 A KR 19990017346A
- Authority
- KR
- South Korea
- Prior art keywords
- refrigerant
- noise
- discharge pipe
- suction
- suction muffler
- Prior art date
Links
- 239000003507 refrigerant Substances 0.000 claims abstract description 42
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002238 attenuated effect Effects 0.000 description 9
- 230000004308 accommodation Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Classifications
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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
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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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/12—Kind or type gaseous, i.e. compressible
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
- F05B2260/962—Preventing, counteracting or reducing vibration or noise by means creating "anti-noise"
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S417/00—Pumps
- Y10S417/902—Hermetically sealed motor pump unit
Abstract
본 발명은 기상냉매의 수용공간을 형성하며, 외부의 냉매공급관이 접속되는 흡입포트와, 압축실린더에 냉매를 전달하는 배출관을 가지는 밀폐형 왕복동식 압축기용 흡입머플러에 관한 것으로서, 상기 배출관은 평행한 한쌍의 유동로를 가지며, 상기 유동로중 적어도 어느 하나는 일부영역에서 유동단면적이 증대되어 있다. 이에 의해, 다양한 주파수 및 특정주파수의 소음을 감쇠시키는 감쇠효과를 향상시킬 수 있다.The present invention relates to a suction muffler for a hermetic reciprocating compressor having a suction port to which an external refrigerant supply pipe is connected, and a discharge pipe for transferring refrigerant to a compression cylinder, the discharge pipe being a parallel pair. It has a flow path of at least any one of the flow path has a flow cross-sectional area is increased in some areas. Thereby, the attenuation effect which attenuates the noise of various frequencies and a specific frequency can be improved.
Description
본 발명은 밀폐형 왕복동식 압축기의 흡입머플러에 관한 것으로서, 소음감소 효과를 증대시킨 밀폐형 왕복동식 압축기의 흡입머플러에 관한 것이다.The present invention relates to a suction muffler of a hermetic reciprocating compressor, and more particularly to a suction muffler of a hermetic reciprocating compressor having an increased noise reduction effect.
밀폐형 왕복동식 압축기는, 통상적으로 냉장고와 같은 냉동시스템에 설치되어 냉매를 고온고압으로 압축하여 냉동시스템을 구동한다. 압축기는, 도 1에 도시된 바와 같이, 냉매를 압축하는 피스톤을 가진 실린더장치(5)와, 실린더장치(5)를 구동하는 구동부(3)로 이루어져 있다. 이러한 압축기는 냉매의 압축을 위한 피스톤의 구동시 순간적인 압축에 의해 소음이 발생하며, 이 소음을 감소시키기 위해 냉매의 압축작동을 행하는 실린더장치(5)와 냉매가 공급되는 냉매공급관 사이에 흡입머플러가 설치되어 있다. 흡입머플러내에는 공명실이 형성되어 있으며, 공명실의 공명길이를 조절하여 특정주파수의 소음을 감소시킬 수 있다.The hermetic reciprocating compressor is typically installed in a refrigeration system such as a refrigerator to compress the refrigerant at high temperature and high pressure to drive the refrigeration system. As shown in FIG. 1, the compressor consists of the cylinder apparatus 5 which has a piston which compresses a refrigerant | coolant, and the drive part 3 which drives the cylinder apparatus 5. As shown in FIG. Such a compressor generates noise by momentary compression when driving a piston for compressing a refrigerant, and a suction muffler is provided between a cylinder device 5 that performs a compression operation of the refrigerant and a refrigerant supply pipe supplied with a refrigerant to reduce the noise. Is installed. A resonance chamber is formed in the suction muffler, and the resonance length of the resonance chamber can be adjusted to reduce noise of a specific frequency.
이러한 흡입머플러는, 도 3에 도시된 바와 같이, 머플러본체(71)와, 외부로부터 냉매를 공급하는 냉매공급관(61)에 접속되는 흡입포트(76)와, 실린더장치(5)로 냉매를 배출하는 한 쌍의 배출관(74)을 가지며, 머플러본체(71)내에는 격벽(75)에 의해 기상냉매를 수용하는 한 쌍의 수용공간이 형성되어 있다. 이에 따라, 흡입포트(76)와 배출관(74)이 각각 다른 공간에 수용되게 되며, 흡입포트(76)를 수용하는 수용공간을 주공명실(72)이라하고, 배출관(74)을 수용하는 수용공간을 부공명실(73)이라 한다. 주공명실(72)과 부공명실(73)은 격벽(75)을 관통하여 형성된 관상의 배플(80)에 의해 연통되어 있다. 한편, 배출관(74)과 실린더장치(5) 사이에는 실린더헤드(59)가 설치되어 있으며, 배출관(74)은 실린더헤드(59)에 형성된 도시않은 흡입공을 통해 실린더장치(5)의 내부와 연통된다. 흡입공은 실린더헤드(59)에 설치된 흡입밸브(57)에 의해 폐쇄되어 있으며, 흡입밸브(57)는 실린더장치(5)내의 피스톤의 왕복운동시 압력에 의해 연동하여 흡입공을 개폐한다.As shown in FIG. 3, the suction muffler discharges the refrigerant to the muffler main body 71, the suction port 76 connected to the refrigerant supply pipe 61 for supplying the refrigerant from the outside, and the cylinder device 5. It has a pair of discharge pipe 74, a pair of receiving space is formed in the muffler main body 71 to receive the gaseous refrigerant by the partition wall (75). Accordingly, the suction port 76 and the discharge pipe 74 are respectively accommodated in different spaces, the accommodation space for receiving the suction port 76 is called the main resonance chamber 72, the accommodation space for accommodating the discharge pipe 74 This is called the negative resonance chamber (73). The main resonance chamber 72 and the sub resonance chamber 73 communicate with each other by a tubular baffle 80 formed through the partition wall 75. On the other hand, the cylinder head 59 is installed between the discharge pipe 74 and the cylinder device 5, the discharge pipe 74 and the inside of the cylinder device 5 through the suction hole (not shown) formed in the cylinder head 59 Communicating. The suction hole is closed by the suction valve 57 provided in the cylinder head 59, and the suction valve 57 interlocks with the pressure hole during the reciprocating movement of the piston in the cylinder device 5 to open and close the suction hole.
이러한 압축기가 구동하면, 냉매공급관(61)으로부터의 냉매가 흡입포트(76)를 통하여 유입되고, 유입된 냉매는 배플(80)을 통하여 배출관(74)으로 안내된다. 그리고, 냉매는 한 쌍의 배출관(74)을 따라 흡입공을 통해 실린더장치(5)내로 흡입되어 실린더장치(5)내에서 압축된다. 이 때, 흡입밸브(57)가 고속으로 흡입공을 개폐함에 따라 흡입밸브(57)에 의한 흡입공의 타격으로 소음이 발생하게 되며, 이 소음은 냉매의 흐름과 반대방향인 배출관(74)을 통해 이동하여 부공명실(73)에서 공명된 주파수와 간섭하여 일차적으로 감쇠된다. 그리고, 일차감쇠된 소음은 배플(80)을 통해 주공명실(72)에서 발생하는 특정주파수, 예를 들면 500Hz와 간섭하여 소음이 감쇠되어 냉매공급관(61)으로 향하게 된다. 이에 따라, 소음의 진동이 상쇄되어 소음이 감쇠되게 된다.When the compressor is driven, the refrigerant from the refrigerant supply pipe 61 is introduced through the suction port 76, and the introduced refrigerant is guided to the discharge pipe 74 through the baffle 80. The refrigerant is sucked into the cylinder device 5 through the suction hole along the pair of discharge pipes 74 and compressed in the cylinder device 5. At this time, as the suction valve 57 opens and closes the suction hole at a high speed, noise is generated by the suction hole of the suction valve 57, and the noise causes the discharge pipe 74 to be opposite to the flow of the refrigerant. It travels through and interferes with the frequency resonated in the sub resonance chamber 73 and is primarily attenuated. In addition, the primary attenuated noise interferes with a specific frequency generated in the main resonance chamber 72 through the baffle 80, for example, 500 Hz, and the noise is attenuated to the refrigerant supply pipe 61. Accordingly, the vibration of the noise is canceled and the noise is attenuated.
그런데, 이러한 종래의 압축기용 흡입머플러(70)는, 소음을 일으키는 진동이 배플(80)을 거쳐 부공명실에서 주공명실(72)로 진행하는 동안에는 소음감쇠가 잘 이루어지지 아니하며, 부공명실(73)과 주공명실(72)에서는 각 공명실의 공명길이에 의한 특정주파수의 소음만이 감쇠되므로 소음을 충분히 감쇠시켜 주지 못한다는 단점이 있다.However, in the conventional compressor suction muffler 70, the noise attenuation is not performed well while the vibration causing noise passes from the sub resonance chamber to the main resonance chamber 72 through the baffle 80, and the sub resonance chamber 73 In the main resonance chamber 72, since only the noise of a specific frequency due to the resonance length of each resonance chamber is attenuated, the noise cannot be sufficiently attenuated.
따라서 본 발명의 목적은, 다양한 주파수의 소음을 감소시킬 수 있는 밀폐형 왕복동식 압축기의 흡입머플러를 제공하는 것이다.It is therefore an object of the present invention to provide a suction muffler of a hermetic reciprocating compressor which can reduce noise of various frequencies.
도 1은 밀폐형 왕복동식 압축기의 측단면도,1 is a side cross-sectional view of a hermetic reciprocating compressor,
도 2는 본 발명에 따른 흡입머플러의 단면도,2 is a cross-sectional view of the suction muffler according to the present invention;
도 3은 종래의 흡입머플러의 단면도이다.3 is a cross-sectional view of a conventional suction muffler.
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
1 : 케이싱 3 : 구동부1: casing 3: drive part
5 : 실린더장치 7 : 흡입밸브5 cylinder device 7 suction valve
9 : 실린더헤드 11 : 냉매공급관9: cylinder head 11: refrigerant supply pipe
20 : 흡입머플러 21 : 머플러본체20: suction muffler 21: muffler body
22 : 주공명실 23 : 부공명실22: main resonance room 23: secondary resonance room
24 : 배출관 25 : 격벽24 discharge pipe 25 bulkhead
26 : 흡입포트 30 : 배플26: suction port 30: baffle
35 : 배출관격벽 36 : 유동로35 discharge pipe bulkhead 36 flow path
상기 목적은, 본 발명에 따라, 기상냉매의 수용공간을 형성하며, 외부의 냉매공급관이 접속되는 흡입포트와, 압축실린더에 냉매를 전달하는 배출관을 가지는 밀폐형 왕복동식 압축기용 흡입머플러에 있어서, 상기 배출관은 평행한 한쌍의 유동로를 가지며, 상기 유동로중 적어도 어느 하나는 일부영역에서 유동단면적이 증대되어 있는 것을 특징으로 하는 밀폐형 왕복동식 압축기용 흡입머플러에 의해 달성된다.According to the present invention, in the sealed reciprocating compressor suction muffler having a suction port to form a receiving space for the gaseous refrigerant, the external refrigerant supply pipe is connected, and the discharge pipe for delivering the refrigerant to the compression cylinder, The discharge pipe has a pair of parallel flow paths, and at least one of the flow paths is achieved by a suction muffler for a hermetic reciprocating compressor, characterized in that the flow cross-sectional area is increased in some areas.
여기서, 상기 유동단면적이 증대되는 영역에서 상기 유동로를 상호 연통시키는 연통부가 마련되어 있는 것이 바람직하다. 그리고, 상기 한쌍의 유동로 사이에는 격벽이 마련되어 있으며, 상기 연통부는 상기 격벽을 관통하는 것이 바람직하다.Here, it is preferable that the communicating part which communicates with the said flow path in the area | region which the said flow cross-sectional area increases is provided. The barrier rib is provided between the pair of flow paths, and the communication portion penetrates the barrier rib.
이하, 도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.
밀폐형 왕복동식 압축기는, 도 1과 관련하여 설명한 바와 같이, 케이싱(1)내에 왕복동하는 피스톤을 갖는 냉매를 압축하는 실린더장치(5)와, 실린더장치(5)에 구동력을 제공하는 구동부(3)로 이루어진다. 구동부(3)의 구동력에 의해 피스톤이 실린더장치(5)내에서 왕복동하여 냉매를 압축하며, 냉매의 압축시 소음이 발생하게 된다. 이에 따라, 실린더장치(5)의 일측에는 냉매의 유동을 안내하며, 실린더장치(5)의 구동시 발생하는 소음을 감쇠시키기 위한 흡입머플러가 설치되어 있다.The hermetic reciprocating compressor includes, as described with reference to FIG. 1, a cylinder device 5 for compressing a refrigerant having a reciprocating piston in the casing 1, and a drive unit 3 for providing a driving force to the cylinder device 5. Is made of. The piston reciprocates in the cylinder device 5 by the driving force of the driving unit 3 to compress the refrigerant, and noise is generated when the refrigerant is compressed. Accordingly, one side of the cylinder device 5 is provided with a suction muffler for guiding the flow of the coolant and attenuating noise generated when the cylinder device 5 is driven.
도 2는 본 발명에 따른 흡입머플러의 단면도이다. 흡입머플러(20)는, 흡입머플러본체(21)내에 소음을 감쇠시키는 공명실이 형성되어 있으며, 공명실은 격벽(25)에 의해 분리되어 주공명실(22)과 부공명실(23)을 형성한다. 주공명실(22)과 부공명실(23)은 격벽(25)을 관통하며 형성된 관상의 배플(30)에 의해 상호 연통되어 있다. 그리고, 주공명실(22)의 일측에는 외부로부터의 기상냉매를 공급하는 냉매공급관(61)과 결합되는 흡입포트(26)가 형성되어 있으며, 부공명실(23)의 중앙영역에는 냉매를 압축하는 실린더장치(5)로 냉매를 안내하는 한 쌍의 배출관(24)이 형성되어 있다. 한 쌍의 배출관(24)의 사이에는 각 배출관(24)을 분할하는 배출관격벽(35)이 형성되어 있으며, 각 배출관(24)은 배출관격벽(35)에 의해 소정거리 이격되도록 형성되어 냉매의 유로를 분할하여 냉매의 유동이 원활해지도록 한다. 그리고, 배출관의 축선방향을 따라 배출관격벽(35)의 중앙영역에는 각 배출관(24)을 상호 관통하는 유통로가 형성되어 있다.2 is a cross-sectional view of the suction muffler according to the present invention. In the suction muffler 20, a resonance chamber for damping noise is formed in the suction muffler main body 21, and the resonance chamber is separated by the partition wall 25 to form the main resonance chamber 22 and the sub resonance chamber 23. The main resonance chamber 22 and the sub resonance chamber 23 communicate with each other by a tubular baffle 30 formed through the partition wall 25. In addition, a suction port 26 is formed at one side of the main resonance chamber 22 to be coupled with a refrigerant supply pipe 61 for supplying gaseous refrigerant from the outside, and a cylinder for compressing the refrigerant in the central region of the sub resonance chamber 23. A pair of discharge pipes 24 are formed which guide the refrigerant to the apparatus 5. A discharge pipe partition wall 35 is formed between the pair of discharge pipes 24 to divide each discharge pipe 24. Each discharge pipe 24 is formed to be spaced apart by a predetermined distance by the discharge pipe partition wall 35, thereby providing a flow path for the refrigerant. By dividing the flow of the refrigerant to be smooth. In the central region of the discharge pipe partition wall 35 along the axial direction of the discharge pipe, a flow passage passing through each of the discharge pipes 24 is formed.
한편, 배출관(24)과 실린더장치(5)는 실린더헤드(9)에 의해 연결되며, 실린더헤드(9)에는 실린더장치(5)로 냉매가 유입되는 도시않은 흡입공이 형성되어 있다. 이 흡입공은 흡입밸브(7)에 의해 폐쇄되어 있으며, 흡입밸브(7)는 판상으로 형성되어 실린더장치(5)내의 피스톤의 왕복동에 의한 압력에 의해 흡입공을 개폐한다.On the other hand, the discharge pipe 24 and the cylinder device 5 is connected by the cylinder head 9, the cylinder head 9 is formed with a suction hole (not shown) through which the refrigerant flows into the cylinder device (5). This suction hole is closed by the suction valve 7, and the suction valve 7 is formed in a plate shape to open and close the suction hole by the pressure of the piston in the cylinder device 5 by the reciprocating motion.
이러한 구성에 의한 압축기가 구동하면, 냉매공급관(11)으로부터의 기상냉매가 흡입포트(26)를 통해 흡입머플러(20)내로 유입된다. 유입된 냉매는 배플(30)을 지나 한 쌍의 배출관(24)을 통과하여 흡입공을 통해 실린더장치(5)내로 흡입된다. 이 때, 실린더장치(5)내의 피스톤의 왕복동운동에 의해 흡입밸브(7)가 고속으로 흡입공을 개폐함에 따라 소음이 발생하게 되며, 이 소음은 냉매의 흐름과 반대방향인 배출관(24)을 통해 이동하게 된다. 한 쌍의 배출관(24)에 의해 분할되어 각 배출관(24)을 따라 냉매와 반대방향으로 이동하던 소음은, 배출관격벽(35)에 형성된 유동로(36)에 의해 유동단면적이 확장되면서 상호 간섭을 일으키며 소정 저주파수의 소음을 감쇠시키게 된다. 그런 다음, 부공명실(23) 및 주공명실(22)에서 특정주파수의 소음이 감쇠되어 냉매공급관(11)을 통해 방출된다.When the compressor having such a configuration is driven, the gaseous refrigerant from the refrigerant supply pipe 11 flows into the suction muffler 20 through the suction port 26. The introduced refrigerant passes through the baffle 30, passes through the pair of discharge pipes 24, and is sucked into the cylinder device 5 through the suction hole. At this time, noise is generated as the suction valve 7 opens and closes the suction hole at a high speed by the reciprocating motion of the piston in the cylinder device 5, and this noise causes the discharge pipe 24 which is opposite to the flow of the refrigerant. Will go through. The noise, which is divided by a pair of discharge pipes 24 and moves in the opposite direction to the refrigerant along each discharge pipe 24, expands the cross sectional area of the flow path 36 formed in the discharge pipe bulkhead 35, thereby mutually interfering with each other. And attenuate noise of a certain low frequency. Then, the noise of a specific frequency is attenuated in the sub resonance chamber 23 and the main resonance chamber 22 is discharged through the refrigerant supply pipe (11).
여기서, 소음의 감쇠가 이루어지는 주파수는, 공명길이의 네배를 소음의 속도로 나눈 주파수가 된다. 따라서, 각 공명실과 소음의 유동경로상의 유동단면적을 다르게 하면 다양한 주파수의 소음을 감쇠시킬 수 있게 된다. 또한 압축기의 특성에 따라 공명실과 유동단면적을 변형하여 제작하면 원하는 주파수의 소음을 감쇠시킬 수 있다.Here, the frequency at which the noise is attenuated is a frequency obtained by dividing four times the resonance length by the speed of the noise. Therefore, if the cross-sectional area of each resonance chamber and the flow path of the noise is different, it is possible to attenuate the noise of various frequencies. In addition, by modifying the resonance chamber and the flow cross-sectional area according to the characteristics of the compressor can reduce the noise of the desired frequency.
이와 같이, 소음이 배출관격벽(35)의 유동로(36)를 지나면서 감쇠되어 배플을 통해 냉매공급관으로 직접 배출되는 소음이 양이 줄어든다.As such, the noise is attenuated while passing through the flow path 36 of the discharge pipe bulkhead 35, so that the amount of noise directly discharged to the refrigerant supply pipe through the baffle is reduced.
이상에서 설명한 바와 같이, 본 발명에 따르면, 각 배출관을 연통시켜 저주파수의 소음을 감쇠시킴으로써, 다양한 주파수 및 특정주파수의 소음을 감쇠시키는 감쇠효과를 향상시킬 수 있다.As described above, according to the present invention, the attenuation effect of attenuating noise of various frequencies and specific frequencies can be improved by attenuating low frequency noise by communicating each discharge pipe.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970040249A KR100229469B1 (en) | 1997-08-22 | 1997-08-22 | Suction muffler of a hermetic reciprocating compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019970040249A KR100229469B1 (en) | 1997-08-22 | 1997-08-22 | Suction muffler of a hermetic reciprocating compressor |
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| KR100229469B1 KR100229469B1 (en) | 2000-01-15 |
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