US20040086406A1 - Cylinder assembly for hermetic compressor - Google Patents

Cylinder assembly for hermetic compressor Download PDF

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Publication number
US20040086406A1
US20040086406A1 US10/663,069 US66306903A US2004086406A1 US 20040086406 A1 US20040086406 A1 US 20040086406A1 US 66306903 A US66306903 A US 66306903A US 2004086406 A1 US2004086406 A1 US 2004086406A1
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US
United States
Prior art keywords
cylinder
valve
discharge
assembly
discharge chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/663,069
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English (en)
Inventor
Sung-Tae Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Gwangju Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Gwangju Electronics Co Ltd filed Critical Samsung Gwangju Electronics Co Ltd
Assigned to SAMSUNG GWANGJU ELECTRONICS CO., LTD. reassignment SAMSUNG GWANGJU ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEE, SUNG-TAE
Publication of US20040086406A1 publication Critical patent/US20040086406A1/en
Abandoned legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • F04B39/10Adaptations or arrangements of distribution members
    • F04B39/1073Adaptations or arrangements of distribution members the members being reed valves
    • F04B39/108Adaptations or arrangements of distribution members the members being reed valves circular reed valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • F04B39/10Adaptations or arrangements of distribution members
    • F04B39/1066Valve plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • F04B39/10Adaptations or arrangements of distribution members
    • F04B39/1073Adaptations or arrangements of distribution members the members being reed valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • F04B39/12Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/125Cylinder heads

Definitions

  • the present invention is generally related to a compressor and more specifically, to a cylinder assembly for a hermetic compressor.
  • a cylinder assembly as shown in FIGS. 1 and 3, includes a hermetic casing 100 wherein a drive unit 200 and a compression unit 300 are formed.
  • the hermetic casing 100 includes an upper casing 110 and a lower casing 120 , and an inlet tube 130 is formed in the hermetic casing 100 .
  • Lubricating oil is contained at the bottom of the lower casing 100 .
  • the drive unit 200 includes a stator 210 fixed inside the hermetic casing 100 , a rotor 220 which spins inside the stator 210 , and also a crank shaft 230 integrally formed with the rotor 220 to spin along with the rotor 220 .
  • the compression unit 300 consists of a connecting rod 310 that is connected to an eccentric portion 240 of the crank shaft 230 and that converts circular movement of the rotor 220 into backward and forward linear movement of a piston 320 , which is connected to one end of the connecting rod 310 .
  • a cylinder assembly 400 accepts and guides the reciprocating motion of the piston 320 .
  • the cylinder assembly 400 includes a cylinder block 420 having a cylinder 410 , a cylinder head 430 which is connected to the cylinder block 420 to seal the cylinder 410 , and a valve assembly 440 disposed together with gaskets 480 , 490 between the cylinder block 420 and the cylinder head 430 .
  • the inside of the cylinder head 430 is divided by a partition 431 into a suction chamber 432 and a discharge chamber 433 .
  • a partition 431 Formed at a side of the cylinder head 430 is an inlet hole 434 (FIG. 2) to connect a suction muffler 500 and a suction chamber 432 .
  • the cylinder block 420 has a discharge muffler 421 to reduce noise generated by compressed refrigerant flow.
  • the discharge muffler 421 is connected to the discharge chamber 433 of the cylinder head 430 through an outlet path 422 which is formed in one side of the cylinder block 420 .
  • the valve assembly 440 includes a valve plate 450 , a suction valve 460 and a discharge valve 470 .
  • the valve plate 450 has a suction port 451 and a discharge port 452 .
  • the cylinder 410 of the cylinder block 420 and the suction chamber 432 of the cylinder head 430 are in fluid communication via the suction port 451 . Moreover, so are the cylinder 410 of the cylinder block 420 and the discharge chamber 433 of the cylinder head 430 via the discharge port 452 .
  • the suction valve 460 is positioned near the cylinder block 420 of the valve plate 450 in order to selectively open the suction port 451 .
  • the suction valve 460 is formed by cutting out a part of the suction valve sheet 461 disposed between the cylinder block 420 and the valve plate 450 .
  • the discharge valve 470 is located nearby the cylinder head 430 of the valve plate 450 in order to selectively open the discharge port 452 . Formed at the back of the discharge valve 470 by turns are a stopper 471 and a keeper 472 to control lift of the discharge valve 470 .
  • the suction valve 460 and the discharge valve 470 move freely according to pressure in the cylinder 410 , opening and closing the suction port 451 and the discharge port 452 , which makes it possible for refrigerant of the suction chamber 432 to flow into the cylinder 410 and for refrigerant of the cylinder 410 to be discharged into the discharge chamber 433 .
  • Specific explanation of prior cylinder assembly 400 follows with reference to FIG. 3.
  • the piston 320 compresses the refrigerant in the cylinder 410 by moving from the lower end of its travel toward the upper end of its travel, and accordingly, the pressure of the cylinder 410 increases.
  • the suction valve 460 is moved to close the suction port 451 , as shown in solid line of FIG. 3, by the high pressure in the cylinder 410 .
  • the piston 320 moves further towards its upper end of front dead end, and the pressure of the cylinder 410 more increases.
  • the pressure inside the cylinder 410 is at its maximum.
  • the cylinder pressure has the discharge valve 470 move as shown in solid line in FIG. 3, thereby opening the discharge port 452 . Therefore, the compressed refrigerant in the cylinder 410 is discharged into the discharge chamber 433 of the cylinder head 430 through the discharge port 452 .
  • the conventional cylinder assembly 400 has another drawback: high manufacturing cost due to the big size of the valve plate 450 and the suction sheet 461 , and the complex structure of the valve assembly 440 .
  • the present invention overcomes these problems of the prior art.
  • the main object of the invention is to provides a quieter hermetic compressor. This is achieved by applying a sound transmission loss theory, so that the sound wave generated when a discharge valve strikes a valve plate is discharged through two separate discharge chambers in a cylinder head to a discharge muffler.
  • Another object of the present invention is to provide a cost-effective cylinder assembly for a hermetic compressor by employing a small and simple valve assembly.
  • the novel cylinder assembly for hermetic compressors capable of achieving the above objects includes a cylinder block having a cylinder in which a piston reciprocates, the cylinder head being connected to the cylinder block to seal the cylinder.
  • the head is equipped with an inlet hole, and a first and second discharge chambers serve as an outlet path.
  • the valve assembly is located between the cylinder block and the cylinder head, and that assembly controls refrigerant outflow and on flow to and from the cylinder according to the pressure difference inside and outside the cylinder.
  • a partition has one or more connecting holes to connect the first and second discharge chamber.
  • the partition is cylindrical, the space inside is defined as the first discharge chamber, and it has a valve assembly seating surface for the valve assembly to be mounted thereon.
  • An inlet path is positioned inside the partition, but it is not connected to the first discharge chamber. Outside the partition is defined as the second discharge chamber.
  • the valve assembly has a valve plate having a suction port for putting the inlet hole and the cylinder in fluid communication.
  • a suction valve sheet has a suction valve for opening and closing the suction port; and a discharge valve sheet has a discharge valve for opening and closing the discharge port.
  • a gasket is located between the discharge valve sheet and the valve assembly seating surface so as to block the inlet hole and the first discharge chamber. The gasket has an cut-away portion positioned to secure and limit the lift travel of the discharge valve.
  • the first discharge chamber has a stopper portion for controlling the lift of the discharge valve, which is formed at the same or lower height as that of the valve assembly seating surface.
  • a cylinder gasket is located between the cylinder head and the cylinder block in order to seal the cylinder.
  • FIG. 1 is a sectional view showing a conventional hermetic compressor
  • FIG. 2 is an exploded perspective view showing a conventional cylinder assembly
  • FIG. 3 is a sectional view showing the conventional cylinder assembly of FIG. 2 in use
  • FIG. 4 is an exploded perspective view showing a cylinder assembly for a hermetic compressor provided in accordance with a preferred embodiment of the present invention
  • FIG. 5 is a sectional view showing the cylinder assembly of the present invention of FIG. 4 as it may appear when it is being assembled.
  • FIG. 6 and 7 are sectional views showing the cylinder assembly according to a preferred embodiment of the present invention as it may appear when in use.
  • a cylinder assembly for hermetic compressor 600 includes a cylinder block 610 , a cylinder head 620 , and a valve assembly 630 .
  • the cylinder block 610 has a cylinder 611 with a piston 320 (See FIG. 5) and a discharge muffler 612 (See FIGS. 6 and 7) for reducing discharge pulse pressures of refrigerant discharged from the cylinder 611 .
  • Formed on one side of the cylinder block 610 is an outlet path 613 connecting the cylinder to the discharge muffler 612 .
  • the cylinder head 620 is combined with the cylinder block 610 to enclose the cylinder 611 and has a partition 621 formed therein.
  • the partition 621 can take forms other than being cylindrical).
  • Inside, the cylinder head 620 is divided by the partition 621 into a first 622 and a second 623 discharge chamber.
  • Formed inside the partition 621 are an inlet path 624 through which the refrigerant flows in, and a valve assembly seating surface 625 on which the valve assembly 630 is seated.
  • the inlet path 624 is connected to an inlet pipe 510 that is joined with the suction muffler 500 , the refrigerant of the suction muffler 500 (See FIG. 5) is directed into the inlet path 624 through the inlet pipe 510 .
  • the first discharge chamber 622 and the second discharge chamber 623 are interconnected by a connecting hole 621 a formed in the partition 621 and the second discharge chamber 623 is connected to the outlet path 613 of the cylinder block 610 .
  • the more than one connecting hole 621 a can be provided.
  • the compressed refrigerant escaping from the cylinder 611 is discharged to the first discharge chamber 622 , and then to the second discharge chamber 623 through the connecting hole 621 a.
  • a stopper portion 626 is formed with the same or lower height as the valve assembly seating surface 625 .
  • the stopper portion 626 controls the lift of the discharge valve 636 of the valve assembly 630 whereby the discharge valve 636 swiftly opens and closes a discharge port 633 b.
  • the valve assembly 630 is cylindrical so that the valve assembly seating surface 625 precisely fits with the partition 621 .
  • the valve assembly 630 includes a gasket 631 , a discharge valve 632 , a valve plate 633 and a suction valve sheet 634 . Inserted in the discharge chamber 622 are, in order, of the gasket 631 , the discharge valve sheet 632 , the valve plate 633 and the suction valve sheet 634 .
  • the valve assembly 630 is substantially the same as the partition 621 in height.
  • the discharge valve sheet 632 and the valve plate 633 are suction ports 631 a , 632 a , 633 a connected to the inlet path 624 , and the discharge ports 633 b , 634 a are formed on both the valve plate 633 and the suction valve sheet 634 .
  • the gasket 631 secures a space for a lift of the discharge valve 636 towards the first discharge chamber 622 by spacing the valve assembly seating surface 625 apart from the discharge valve sheet 632 .
  • the gasket 631 has a cut-away portion 631 b which creates a lifting gap as thick as the gasket 631 between the valve assembly seating surface 625 and the discharge valve sheet 632 . Therefore, the discharge valve 636 can be lifted towards the first discharge chamber 622 through the cut-away portion 631 b.
  • the suction valve sheet 634 has the suction valve 635 formed therein in the form of a partly cut portion for selectively opening the suction port 633 a .
  • the same form also applies to the discharge valve 636 formed on the discharge valve sheet 632 in order to selectively open the discharge port 633 b.
  • a cylinder gasket 640 Inserted between the cylinder block 610 and the cylinder head 620 is a cylinder gasket 640 which seals between the second discharge chamber 622 and the cylinder 611 to prevent any refrigerant flow between the two. There is a path hole 640 a in one part of the cylinder gasket 640 to connect the second discharge chamber 623 and the outlet path of the cylinder block 610 .
  • valve assembly 630 When the valve assembly 630 is assembled in the partition 621 , it exactly fits into the partition 621 protrudes. Further, when the cylinder block 610 compresses the valve assembly 630 towards the cylinder head 620 , the protrusion of the valve assembly 630 is pushed into the partition 621 , thereby causing the valve assembly 630 and the cylinder gasket 640 to fit without void.
  • the refrigerant in the cylinder 611 is compressed as the piston 320 moves from the lower dead end of its travel to the upper dead end of its travel and accordingly, the pressure in the cylinder 611 rises. Because of the pressure, the suction valve 635 is moved as shown in dotted line of FIG. 6 to close the suction port 633 a.
  • the pressure in the cylinder 611 maximizes.
  • the discharge valve 636 opens to the first discharge chamber 622 of the cylinder head 620 through the cut-away portion 631 b of the gasket 631 as shown in FIG. 7, opening the discharge port 633 b.
  • the lift of the discharge valve 636 is controlled when the discharge valve hits the stopper portion 626 of the discharge chamber 622 .
  • the compressed refrigerant in the cylinder 611 is discharged to the first discharge chamber 622 of the cylinder head 620 through the discharge port 633 b.
  • the refrigerant from the cylinder 611 passes through the first and second discharge chambers 622 , 623 in the cylinder head 620 , and consequently, the discharge pulsation is reduced.
  • the sound wave which is generated when the suction valve 635 or the discharge valve 636 hits the valve plate 633 , escapes to the discharge valve 612 through the first and second discharge chamber 622 , 623 , sound transmission loss occurs due to boundary interference and as a result, the sound wave is reduced.
  • noise during operation of the compressor can be reduced.
  • the refrigerant discharged from the cylinder 611 flows to the discharge muffler 612 through both the first and the second discharge chambers 622 , 623 , so discharge pulsation is lessened.
  • parts of the valve plate 633 , the suction valve sheet 634 , the discharge valve sheet 632 and the discharge assembly 630 are small in size and simple in design in order to be easily fit into the inside partition 621 . Because of this, cylinder assembly manufacturing cost including material and assembling cost can be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
US10/663,069 2002-11-06 2003-09-16 Cylinder assembly for hermetic compressor Abandoned US20040086406A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2002-0068446A KR100494527B1 (ko) 2002-11-06 2002-11-06 밀폐형 압축기의 실린더 조립체
KR2002-68446 2002-11-06

Publications (1)

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US20040086406A1 true US20040086406A1 (en) 2004-05-06

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ID=36754278

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US10/663,069 Abandoned US20040086406A1 (en) 2002-11-06 2003-09-16 Cylinder assembly for hermetic compressor

Country Status (6)

Country Link
US (1) US20040086406A1 (it)
JP (1) JP2004156579A (it)
KR (1) KR100494527B1 (it)
CN (1) CN1255632C (it)
BR (1) BR0304800A (it)
IT (1) ITTO20030838A1 (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050191197A1 (en) * 2004-02-26 2005-09-01 Samsung Gwang Ju Electronics Co., Ltd Hermetic compressor
WO2007128713A1 (en) * 2006-05-02 2007-11-15 Arcelik Anonim Sirketi A compressor
WO2009124659A2 (de) * 2008-04-11 2009-10-15 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Ventilplatte für einen kompressor und verfahren zur kühlung komprimierter luft in einer ventilplatte eines kompressors
WO2010060169A1 (en) 2008-11-27 2010-06-03 Whirlpool S.A. Valve actuation system for a suction valve of a gas compressor for refrigeration equipment
WO2017191229A1 (en) * 2016-05-05 2017-11-09 Arcelik Anonim Sirketi A hermetic compressor with increased performance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104165133A (zh) * 2014-09-03 2014-11-26 安徽美芝制冷设备有限公司 压缩机曲轴箱和具有其的压缩机
CN110645165B (zh) * 2019-09-23 2021-05-25 广州万宝集团压缩机有限公司 缸头组件、压缩机和制冷装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392788A (en) * 1980-08-15 1983-07-12 Diesel Kiki Co., Ltd. Swash-plate type compressor having oil separating function
US4480965A (en) * 1981-10-09 1984-11-06 Diesel Kiki Co., Ltd. Capacity modulation device for compressor
US4930995A (en) * 1988-01-25 1990-06-05 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Device for reducing refrigerant gas pulsations in a compressor
US5860800A (en) * 1994-10-13 1999-01-19 Wabco Vermogensverwaltungs Gmbh Compressor cylinder head having a partition

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JPS5642453Y2 (it) * 1976-11-18 1981-10-05
JPS5648944Y2 (it) * 1976-11-25 1981-11-14
JPS5943990A (ja) * 1982-09-02 1984-03-12 Sanyo Electric Co Ltd 密閉型圧縮機の消音装置
JPS6082591U (ja) * 1983-11-15 1985-06-07 三輪精機株式会社 エア−・コンプレツサ
JPH03206373A (ja) * 1990-01-09 1991-09-09 Sanden Corp 圧縮機の吐出弁機構
JP2001336478A (ja) * 2000-05-25 2001-12-07 Matsushita Refrig Co Ltd 密閉型電動圧縮機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392788A (en) * 1980-08-15 1983-07-12 Diesel Kiki Co., Ltd. Swash-plate type compressor having oil separating function
US4480965A (en) * 1981-10-09 1984-11-06 Diesel Kiki Co., Ltd. Capacity modulation device for compressor
US4930995A (en) * 1988-01-25 1990-06-05 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Device for reducing refrigerant gas pulsations in a compressor
US5860800A (en) * 1994-10-13 1999-01-19 Wabco Vermogensverwaltungs Gmbh Compressor cylinder head having a partition

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050191197A1 (en) * 2004-02-26 2005-09-01 Samsung Gwang Ju Electronics Co., Ltd Hermetic compressor
US7284971B2 (en) * 2004-02-26 2007-10-23 Samsung Gwangju Electronics Co., Ltd. Hermetic compressor
WO2007128713A1 (en) * 2006-05-02 2007-11-15 Arcelik Anonim Sirketi A compressor
US20110070101A1 (en) * 2008-04-11 2011-03-24 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Valve Plate for a Compressor, and Method for Cooling Compressed Air in a Valve Plate of a Compressor
WO2009124659A3 (de) * 2008-04-11 2009-12-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Ventilplatte für einen kompressor und verfahren zur kühlung komprimierter luft in einer ventilplatte eines kompressors
WO2009124659A2 (de) * 2008-04-11 2009-10-15 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Ventilplatte für einen kompressor und verfahren zur kühlung komprimierter luft in einer ventilplatte eines kompressors
US8337177B2 (en) 2008-04-11 2012-12-25 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Valve plate for a compressor, and method for cooling compressed air in a valve plate of a compressor
CN101952591B (zh) * 2008-04-11 2013-06-12 克诺尔商用车制动系统有限公司 压缩机的阀板和用于冷却其中压缩空气的方法
WO2010060169A1 (en) 2008-11-27 2010-06-03 Whirlpool S.A. Valve actuation system for a suction valve of a gas compressor for refrigeration equipment
JP2012510022A (ja) * 2008-11-27 2012-04-26 ワールプール,ソシエダッド アノニマ 冷凍機器用気体圧縮機の吸込弁のための弁作動システム
US8777589B2 (en) 2008-11-27 2014-07-15 Whirlpool S.A. Valve actuation system for a suction valve of a gas compressor for refrigeration equipment
KR101610986B1 (ko) 2008-11-27 2016-04-20 월풀 에쎄.아. 가스 압축기의 흡입밸브를 위한 밸브 작동 시스템
WO2017191229A1 (en) * 2016-05-05 2017-11-09 Arcelik Anonim Sirketi A hermetic compressor with increased performance

Also Published As

Publication number Publication date
KR20040040114A (ko) 2004-05-12
JP2004156579A (ja) 2004-06-03
ITTO20030838A1 (it) 2004-05-07
BR0304800A (pt) 2004-08-31
KR100494527B1 (ko) 2005-06-10
CN1499079A (zh) 2004-05-26
CN1255632C (zh) 2006-05-10

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AS Assignment

Owner name: SAMSUNG GWANGJU ELECTRONICS CO., LTD., KOREA, REPU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEE, SUNG-TAE;REEL/FRAME:014511/0632

Effective date: 20030710

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION