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US20040047751A1 - Reciprocating compressor - Google Patents

Reciprocating compressor Download PDF

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Publication number
US20040047751A1
US20040047751A1 US10/642,814 US64281403A US2004047751A1 US 20040047751 A1 US20040047751 A1 US 20040047751A1 US 64281403 A US64281403 A US 64281403A US 2004047751 A1 US2004047751 A1 US 2004047751A1
Authority
US
United States
Prior art keywords
valve
suction
piston
gas
compressor
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
US10/642,814
Other languages
English (en)
Inventor
Byung-Jik Kim
Hyeong-Seok Kim
Dong-Han Kim
Jin-Sung Park
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, BYUNG-JIK, KIM, DONG-HAN, KIM, HYEONG-SEOK, PARK, JIN-SUNG
Publication of US20040047751A1 publication Critical patent/US20040047751A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • 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
    • F04B39/0005—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 adaptations of pistons
    • F04B39/0016—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 adaptations of pistons with valve arranged in the piston
    • 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
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/102—Adaptations or arrangements of distribution members the members being disc valves

Definitions

  • the present invention relates to a reciprocating compressor, and particularly, to a reciprocating compressor which increases a compression performance by improving the structures of a suction valve for controlling gas suction and a discharge valve for controlling gas discharge.
  • a compressor is an instrument for compressing a refrigerant gas under conditions of low temperature and pressure, which is introduced from an evaporator and discharging the gas by changing the conditions to high temperature and pressure.
  • Compressors can be classified as a rotary compressor, reciprocating compressor and a scroll compressor according to the method of compressing the fluid.
  • the reciprocating compressor takes-in and compresses fluid while a piston moves linearly
  • such reciprocating compressor is divided into a method (and device) which compresses fluid by converting the rotary movement of a driving motor into a reciprocating movement of the piston, and a method (and device) which takes-in and compresses fluid by having the piston perform a reciprocating movement as the driving motor performs a linear reciprocating movement.
  • FIG. 1 is a cross-sectional view showing a conventional reciprocating compressor
  • FIG. 2 is a partially cross-sectional view showing an operation state of a suction valve and a discharge valve in performing gas suction in FIG. 1
  • FIG. 3 is a partially cross-sectional view showing an operation state of the suction valve and the discharge valve in performing gas discharge in FIG. 1.
  • the conventional reciprocating compressor includes a case 10 having a gas suction pipe SP and gas discharge pipe DP, a frame unit 20 which is elastically installed inside the case 10 , a reciprocating motor 30 for generating a driving force while fixed to the frame unit 20 , a compression unit 40 for sucking, compressing and discharging gas by using a linear reciprocating force of the reciprocating motor 30 , and a resonance spring unit 50 for inducing resonating movement by elastically supporting the compression unit 40 in the movement direction.
  • the reciprocating motor 30 includes an outer stator 31 which is installed between the middle frame 22 and rear frame 23 , an inner stator 32 which is secured or coupled to the outer stator 31 at a predetermined spacing and is inserted and secured or coupled with the rear frame 23 , and a movable element 33 which is installed between the outer stator 31 and inner stator 32 for performing a linear reciprocating movement.
  • the compression unit 40 includes a cylinder 41 which is integrally formed in the front frame 21 , a piston 42 which is coupled with the movable element 33 of the reciprocating motor 30 for performing a reciprocating movement in a compression space P 1 of the cylinder 41 , a suction valve 43 which is mounted at the front end of the piston 42 for controlling suction of gas by opening and closing the suction path F of the piston 42 , and a discharging valve assembly 70 which is mounted at the discharging side of the cylinder 41 for controlling discharge of compression gas by opening and closing the compression space P 1 .
  • the discharging valve assembly 70 includes a discharging cover 71 for covering a side of the cylinder 41 , a discharging valve 72 which is inserted inside the discharging cover 71 for opening and closing the compression space P 1 of the cylinder 41 , and a valve spring 73 installed at the inner side of the discharging cover 71 for elastically supporting the discharging valve 72 .
  • An insertion groove 72 b is formed at a pressure supporting surface 72 a , that is, a rear surface of the discharge valve 72 , and a head of a bolt B which fixed to the suction valve 43 protrudes therefrom. Accordingly, the head of the bolt is constructed to be inserted to the insertion groove 72 b at the time of driving gas compression.
  • the discharging valve 72 As the pressure of the gas is higher than a predetermined pressure, when it becomes higher than an elastic force of the valve spring 73 , the discharging valve 72 is moved. As the sequential process that the compression gas is discharged into the compression space P 2 is repeated, gas is discharged by opening and closing of the discharging valve 72 is discharged to the outside through a gas discharging pipe DP which is formed in the discharging cover 71 .
  • the piston 42 moves to an upper dead point (b) after reaching to the lower dead point a, the suction valve 43 returns to an initial state and the suction path F is closed, thereby compressing the refrigerant gas sucked in the compression space P 1 of the cylinder 41 .
  • the discharge valve 72 supported by the valve spring 73 does not move horizontally in the gas compression process, but moves in a slanted state.
  • valve spring 73 hardly has a horizontal disposition in a structure.
  • an object of the present invention is to provide a reciprocating compressor which increases a compression performance by improving the structures of a suction valve for controlling gas suction and a discharge valve for controlling gas discharge.
  • a reciprocating compressor comprising: a piston which reciprocates in a cylinder by receiving a driving force of a reciprocating motor and has a gas suction path therein; a suction valve mounted at an end surface of the piston to control flow of gas taken-in through the suction path; a valve assembly having a discharge cover engaged to one side of the cylinder, a discharge valve installed at an end portion of the cylinder to control gas discharge of a compression space formed by the cylinder and the piston, and a valve spring that elastically supports the discharge valve; and a suction valve fixing member engaged to a frontal surface of the piston that movably receives the suction valve back and forth.
  • the suction valve is provided with supporting surfaces at the outer circumference thereof, and suction surfaces that pass gas are formed between the supporting surfaces.
  • the suction valve fixing member is provided with a through hole connected to the suction path at a center of the frontal surface thereof.
  • a protrusion surface is formed at a center of the rear surface of the discharge valve to correspond to the through hole.
  • a reciprocating compressor comprising: a piston which reciprocates in a cylinder by receiving a driving force of a reciprocating motor and has a gas suction path therein; a suction valve mounted at an end surface of the piston to control flow of gas taken-in through the suction path; a valve assembly having a discharge cover engaged to one side of the cylinder, a discharge valve installed at an end portion of the cylinder to control gas discharge of a compression space formed by the cylinder and the piston, and a valve spring that elastically supports the discharge valve; a round head rivet that fixes the suction valve to the piston; and an insertion groove formed at the rear surface of the discharge valve to insert the round head rivet.
  • FIG. 1 is a sectional view of the conventional reciprocating compressor
  • FIG. 2 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating suction of gas in the compressor of FIG. 1;
  • FIG. 3 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating discharge of gas in the compressor of FIG. 1;
  • FIG. 4 is a longitudinal sectional view showing a reciprocating compressor according to one preferred embodiment of the present invention.
  • FIG. 5 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating suction of gas in the compressor of FIG. 4;
  • FIG. 6 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating discharge of gas in the compressor of FIG. 4;
  • FIG. 7 is a disassembled perspective view showing an engagement mechanism of the suction valve and the piston
  • FIG. 8 is a disassembled perspective view showing another engagement mechanism of the suction valve and the piston;
  • FIG. 9 is a frontal view showing a suction valve fixing member of the compressor of FIG. 4.
  • FIGS. 10 and 11 show a part of the reciprocating compressor according to another preferred embodiment of the present invention, wherein FIG. 10 is a longitudinal sectional view showing an operation state of the discharge valve assembly in suctioning gas; and
  • FIG. 11 is a longitudinal sectional view showing an operation state of the discharge valve assembly in compressing gas.
  • FIG. 4 is a longitudinal sectional view showing a reciprocating compressor according to one preferred embodiment of the present invention
  • FIG. 5 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating suction of gas in the compressor FIG. 4
  • FIG. 6 is a partially cross-sectional view showing an operation state of the discharge valve assembly in operating discharge of gas in the compressor FIG. 4
  • FIG. 7 is a disassembled perspective view showing an engagement mechanism of the suction valve and the piston
  • FIG. 8 is a disassembled perspective view showing another engagement mechanism of the suction valve and the piston
  • FIG. 9 is a frontal view showing a suction valve fixing member of the compressor FIG. 4.
  • a reciprocating compressor comprises: a case 10 having a gas suction pipe SP and gas discharge pipe DP; a frame unit 20 installed in the case 10 ; a reciprocating motor 30 having a movable element which moves linearly; a piston 142 which reciprocates in the cylinder 141 by being connected to the movable element and has a gas suction path F therein; a suction valve 143 mounted at an end surface of the piston 142 for controlling a flow of gas sucked through the suction path F; a valve assembly 170 for controlling a discharge of compressed gas; and a suction valve fixing member 144 engaged to the frontal surface of the piston 142 for movably receiving the suction valve 143 as it moves back and forth.
  • the discharging valve assembly 170 includes a discharge cover 171 having a predetermined shape and formed to cover one side of the cylinder 141 , a discharge valve 172 inserted to the inner portion of the discharge cover 171 for opening and closing the compression space P 1 of the cylinder 141 ; and a valve spring 173 supported on the inner side of the discharge cover 171 and engaged to the discharge valve 172 for elastically supporting the discharge valve 172 while setting the position of the discharge valve 172 .
  • a suction valve fixing member 144 is engaged to a frontal surface of the piston 142 with a predetermined spacing in order to movably receive the suction valve 143 as it moves backward and forward, and a connection hole H connected to the suction path F is formed at a center of the frontal surface of the suction valve fixing member 144 .
  • a dead volume preventing surface 172 a protrudes from a center of the rear surface of the discharge valve 172 corresponding to the connection hole H.
  • the suction valve fixing member 144 having a cylindrical shape includes a cylindrical body 144 b engaged to the piston 142 , and a stopping portion 144 a extending traversely from the end portion surface of the body 144 b for restricting the movement of the suction valve 143 .
  • the suction valve fixing member 144 when the suction valve fixing member 144 is engaged to the piston 142 , the suction valve fixing member 144 can be forcibly fit to a frontal side of the piston 142 .
  • the suction valve fixing member 144 can be engaged to the piston 142 by a male screw S 1 formed in front of the piston 142 and a female screw S 2 formed at the inner circumferential surface of the suction valve fixing member 144 .
  • the suction valve is formed as a thin plate and can include any components which are smoothly operated when gas is taken-in and compressed.
  • the suction valve 143 opens the suction path F at the time when gas is taken in, and closes the suction path F at the time when gas is compressed.
  • the suction valve 143 includes a supporting surface 143 b at an outer circumference and a suction surface 143 a formed between the supporting surfaces 143 b to pass gas.
  • the supporting surface 143 b is stopped by the stopping portion 144 a of the suction valve fixing member 144 , and the suction surface 143 a opens the suction path F of the piston 142 when operating to take-in gas and closes the connection hole H of the suction valve 143 when operating in compression of gas.
  • the suction valve 143 installed at an inner surface of the suction valve fixing member 144 moves backward and thereby opens the suction path F.
  • gas which passed the suction path F passes the suction surface 143 a of the suction valve 143 to pass the connection hole H, thereby being introduced to the compression space P 1 .
  • the dead volume preventing surface 172 a of the discharge valve 172 is inserted to the connection hole H of the suction valve fixing member 144 , thereby preventing components from coming into contact and preventing a collision from occurring and minimizing the dead volume.
  • suction path F is formed at the center of the piston 142 , gas is uniformly discharged, thereby not causing mass unbalance.
  • FIGS. 10 and 11 show a part of the reciprocating compressor according to another preferred embodiment of the present invention, wherein FIG. 10 is a longitudinal sectional view showing an operation state of the discharge valve assembly in performing gas suction and FIG. 11 is a longitudinal sectional view showing an operation state of the discharge valve assembly during gas compression.
  • a reciprocating compressor comprising: a case 10 having a gas suction pipe SP and gas discharge pipe DP; a frame unit 20 installed in the case 10 ; a reciprocating motor 30 having a movable element which linearly moves; a piston 242 which reciprocates in the cylinder 241 by being connected to the movable element and has a gas suction path F therein; a suction valve 243 mounted at an end surface of the piston 242 for controlling a flow of sucked gas through the suction path F; a valve assembly 270 for controlling a discharge of compressed gas; a round head rivet R for fixing the suction valve 243 to the piston 242 ; and an insertion groove 272 b formed at the rear surface of the discharge valve 272 for inserting the round head rivet R.
  • the discharging valve assembly 270 includes a discharge cover 271 having a predetermined shape and formed to cover one side of the cylinder 241 , a discharge valve 272 inserted to the inner portion of the discharge cover 271 for opening and closing the compression space P 1 of the cylinder 241 ; and a valve spring 273 supported on the inner side of the discharge cover 271 and engaged to the discharge valve 272 for elastically supporting the discharge valve 272 while setting or defining the position of the discharge valve 272 .
  • an insertion groove 272 b is formed at the rear surface of the discharge valve 272 in order to receive the round head rivet R.
  • the suction valve 243 goes backward and thereby opens the suction path F. At the same time, gas which passed the suction path F is introduced to the compression space P 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US10/642,814 2002-09-05 2003-08-19 Reciprocating compressor Abandoned US20040047751A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR0053586/2002 2002-09-05
KR10-2002-0053586A KR100486575B1 (ko) 2002-09-05 2002-09-05 왕복동식 압축기의 가스 압축장치

Publications (1)

Publication Number Publication Date
US20040047751A1 true US20040047751A1 (en) 2004-03-11

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ID=31885003

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/642,814 Abandoned US20040047751A1 (en) 2002-09-05 2003-08-19 Reciprocating compressor

Country Status (6)

Country Link
US (1) US20040047751A1 (zh)
JP (1) JP2004100685A (zh)
KR (1) KR100486575B1 (zh)
CN (1) CN1278039C (zh)
BR (1) BR0300264B1 (zh)
DE (1) DE10302065B4 (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005038781A1 (de) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linearverdichter, insbesondere Kältemittelverdichter
US20070041854A1 (en) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linear compressor, particularly refrigerant compressor
US20070041855A1 (en) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linear compressor, particularly refrigerant compressor
US20070134116A1 (en) * 2005-11-10 2007-06-14 Lg Electronics Inc. Linear compressor
US20070166176A1 (en) * 2006-01-16 2007-07-19 Lg Electronics Inc. Linear compressor
CN100412363C (zh) * 2004-09-27 2008-08-20 乐金电子(天津)电器有限公司 线性压缩机防止活塞和排出阀门冲撞装置
EP3163079A1 (en) * 2015-10-28 2017-05-03 LG Electronics Inc. Compressor and method for controlling the same
US10221846B2 (en) 2015-10-28 2019-03-05 Lg Electronics Inc. Linear compressor and method for controlling a linear compressor
IT201800002688A1 (it) * 2018-02-14 2019-08-14 Fiac S R L Dispositivo valvolare unidirezionale
US11384836B2 (en) * 2019-12-11 2022-07-12 Lg Electronics Inc. Piston for compressor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100539770B1 (ko) * 2004-08-16 2006-01-10 엘지전자 주식회사 왕복동식 압축기의 냉매흡입 안내구조
CN101776059A (zh) * 2010-03-08 2010-07-14 上海英范特冷暖设备有限公司 一种提高活塞式空气压缩机效率的结构
JP6298702B2 (ja) * 2014-04-28 2018-03-20 日立アプライアンス株式会社 一方向弁およびそれを備える流体システム
JP6425160B2 (ja) * 2014-04-28 2018-11-21 澤藤電機株式会社 振動型圧縮機
CN110425106B (zh) * 2019-08-16 2020-09-08 成都正升能源技术开发有限公司 一种直线压缩机用活塞组件
CN117231470A (zh) * 2023-11-13 2023-12-15 瑞纳智能设备股份有限公司 压缩机的气体轴承装置及压缩机

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US5232354A (en) * 1992-07-02 1993-08-03 Tecumseh Products Company Compressor discharge valve assembly having plural wave ring biasing means
US5947708A (en) * 1995-08-21 1999-09-07 Lg Electronics Inc. Axial flow valve system for linear compressor
US5993178A (en) * 1996-05-06 1999-11-30 Lg Electronics, Inc. Linear compressor
US6152710A (en) * 1997-12-30 2000-11-28 Lg Electronics, Inc. Discharge valve system for linear compressor
US6530761B1 (en) * 2001-04-04 2003-03-11 Air Products And Chemicals, Inc. Double-acting, two-stage pump

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US1742332A (en) * 1927-10-14 1930-01-07 Robert I Vincent Method of decorating walls
US2522633A (en) * 1946-04-30 1950-09-19 William F Phillips Pump
US3934967A (en) * 1973-07-12 1976-01-27 Sundstrand Corporation Refrigeration compressor and system
US5163819A (en) * 1992-02-07 1992-11-17 General Motors Corporation Asymmetrical suction porting for swash plate compressor
US5232354A (en) * 1992-07-02 1993-08-03 Tecumseh Products Company Compressor discharge valve assembly having plural wave ring biasing means
US5947708A (en) * 1995-08-21 1999-09-07 Lg Electronics Inc. Axial flow valve system for linear compressor
US5993178A (en) * 1996-05-06 1999-11-30 Lg Electronics, Inc. Linear compressor
US6152710A (en) * 1997-12-30 2000-11-28 Lg Electronics, Inc. Discharge valve system for linear compressor
US6530761B1 (en) * 2001-04-04 2003-03-11 Air Products And Chemicals, Inc. Double-acting, two-stage pump

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100412363C (zh) * 2004-09-27 2008-08-20 乐金电子(天津)电器有限公司 线性压缩机防止活塞和排出阀门冲撞装置
US20070040456A1 (en) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linear compressor, particularly refrigerant compressor
US20070041854A1 (en) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linear compressor, particularly refrigerant compressor
US20070041855A1 (en) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linear compressor, particularly refrigerant compressor
US8062005B2 (en) 2005-08-17 2011-11-22 Secop Gmbh Linear compressor with spring arrangement for vibration suppression
DE102005038781A1 (de) * 2005-08-17 2007-02-22 Danfoss Compressors Gmbh Linearverdichter, insbesondere Kältemittelverdichter
US7748967B2 (en) 2005-11-10 2010-07-06 Lg Electronics Inc. Linear compressor
EP1785625A3 (en) * 2005-11-10 2009-11-25 LG Electronics Inc. Linear Compressor
US20070134116A1 (en) * 2005-11-10 2007-06-14 Lg Electronics Inc. Linear compressor
US20070166176A1 (en) * 2006-01-16 2007-07-19 Lg Electronics Inc. Linear compressor
US20110011258A1 (en) * 2006-01-16 2011-01-20 Lg Electronics Inc. Linear compressor
US7988430B2 (en) * 2006-01-16 2011-08-02 Lg Electronics Inc. Linear compressor
EP3163079A1 (en) * 2015-10-28 2017-05-03 LG Electronics Inc. Compressor and method for controlling the same
US10221846B2 (en) 2015-10-28 2019-03-05 Lg Electronics Inc. Linear compressor and method for controlling a linear compressor
US10309392B2 (en) 2015-10-28 2019-06-04 Lg Electronics Inc. Compressor and method for controlling a compressor
IT201800002688A1 (it) * 2018-02-14 2019-08-14 Fiac S R L Dispositivo valvolare unidirezionale
US11105325B2 (en) 2018-02-14 2021-08-31 Fiac S.R.L. One-way valve device
US11384836B2 (en) * 2019-12-11 2022-07-12 Lg Electronics Inc. Piston for compressor

Also Published As

Publication number Publication date
BR0300264B1 (pt) 2012-02-07
JP2004100685A (ja) 2004-04-02
DE10302065A1 (de) 2004-03-18
CN1278039C (zh) 2006-10-04
KR20040022320A (ko) 2004-03-12
CN1480649A (zh) 2004-03-10
DE10302065B4 (de) 2009-07-30
KR100486575B1 (ko) 2005-05-03
BR0300264A (pt) 2004-08-03

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