JP2003184738A - Swash plate type compressor - Google Patents

Swash plate type compressor

Info

Publication number
JP2003184738A
JP2003184738A JP2001382429A JP2001382429A JP2003184738A JP 2003184738 A JP2003184738 A JP 2003184738A JP 2001382429 A JP2001382429 A JP 2001382429A JP 2001382429 A JP2001382429 A JP 2001382429A JP 2003184738 A JP2003184738 A JP 2003184738A
Authority
JP
Japan
Prior art keywords
crank chamber
swash plate
chamber
suction chamber
internal pressure
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.)
Withdrawn
Application number
JP2001382429A
Other languages
Japanese (ja)
Inventor
Hiroyuki Endo
弘之 遠藤
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.)
Sanden Corp
Original Assignee
Sanden Corp
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 Sanden Corp filed Critical Sanden Corp
Priority to JP2001382429A priority Critical patent/JP2003184738A/en
Priority to US10/315,975 priority patent/US20030118456A1/en
Publication of JP2003184738A publication Critical patent/JP2003184738A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036Component parts, details, e.g. sealings, lubrication
    • F04B27/109Lubrication
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036Component parts, details, e.g. sealings, lubrication

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swash plate type compressor preventing the stagnation of a liquid refrigerant in a crank chamber upon stopping operation in the swash plate type compressor provided with a discharge passage discharging a compressed leakage refrigerant which passes through a clearance between a piston and a cylinder bore and is leaked to the crank chamber, from the crank chamber to a suction chamber. <P>SOLUTION: This swash plate type compressor is provided with the discharge passage discharging the compressed leakage refrigerant which passes through the clearance between the piston and the cylinder bore and is leaked to the crank chamber, from the crank chamber to the suction chamber, and a check valve opening the discharge passage when crank chamber internal pressure is higher than suction chamber internal pressure and closing the discharge passage when the crank chamber internal pressure is not more than the suction chamber internal pressure. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、斜板式圧縮機に関
するものである。 【0002】 【従来の技術】ピストンとシリンダボアとの間の隙間を
通りクランク室へ漏出した圧縮漏れ冷媒をクランク室か
ら吸入室へ排出する排出路を備える斜板式圧縮機が、車
両空調装置等に広く使用されている。 【0003】 【発明が解決しようとする課題】斜板式圧縮機が停止し
ており、且つ圧縮機温度よりも空調装置冷却回路のエバ
ポレータやコンデンサー等の温度が高く、ひいてはクラ
ンク室内圧よりも吸入室内圧が高く、且つ空調装置冷却
回路のエバポレータやコンデンサー内冷媒の温度が飽和
温度よりも高い場合に、排出路を通って吸入室からクラ
ンク室へ冷媒が逆流し、冷却され液化されてクランク室
に溜まる。斜板式圧縮機の始動時に、斜板やピストンに
付着している潤滑油が、クランク室に溜まった液冷媒に
よって洗い流され、排出路を通って吸入室へ排出され
る。この結果、斜板とシューとの摺接部、ピストンとシ
リンダボアとの摺接部の潤滑油が不足し、前記摺接部が
金属接触となり磨耗する。本発明は上記問題に鑑みてな
されたものであり、ピストンとシリンダボアとの間の隙
間を通りクランク室へ漏出した圧縮漏れ冷媒をクランク
室から吸入室へ排出する排出路を備える斜板式圧縮機で
あって、運転停止時にクランク室に液冷媒が溜まらない
斜板式圧縮機を提供することを目的とする。 【0004】 【課題を解決するための手段】上記課題を解決するため
に、本発明においては、ピストンとシリンダボアとの間
の隙間を通りクランク室へ漏出した圧縮漏れ冷媒をクラ
ンク室から吸入室へ排出する排出路と、クランク室内圧
が吸入室内圧より高い場合に排出路を開放し、クランク
室内圧が吸入室内圧以下の場合に排出路を閉鎖する逆止
弁とを備えることを特徴とする斜板式圧縮機を提供す
る。本発明に係る斜板式圧縮機においては、圧縮機の運
転時または停止直後で圧縮漏れ冷媒ガスによってクラン
ク室内圧が吸入室内圧よりも高い場合には、排出路が開
放されるので、クランク室内の圧縮漏れガスは排出路を
介して吸入室へ排出される。圧縮機の停止時にクランク
室内圧が吸入室内圧と同等以下になると、排出路が閉鎖
されるので、吸入室の冷媒ガスはクランク室へ逆流しな
い。従って、クランク室には冷媒は溜まらない。 【0005】 【発明の実施の形態】本発明の実施例に係る斜板式圧縮
機を説明する。図1に示すように、斜板式圧縮機100
は、複数のシリンダボア1aとセンターボア1bとが形
成されたシリンダブロック1と、シリンダブロック1と
共働してクランク室3を形成するフロントハウジング2
とを備えている。シリンダヘッド4がシリンダブロック
1と共働して吸入弁5と弁板6と吐出弁7とを挟持して
いる。シリンダヘッド4内に吸入室8と吐出室9とが形
成されている。吸入室8は図示しない吸入ポートに連通
し、吐出室9は図示しない吐出ポートに連通している。
吸入ポート、吐出ポートは図示しない車両空調装置の冷
却回路に接続している。 【0006】斜板式圧縮機100は更にクランク室3内
で延在する駆動軸10を備えている。駆動軸10の一端
はフロントハウジング2を貫通してフロントハウジング
2外へ延び、他端はシリンダブロックのセンターボア1
bに取り付けられた軸受に嵌合している。 【0007】クランク室3内に配設された斜板11が駆
動軸10に固定されている。斜板11の周縁部に、斜板
11を挟んで一対のシュー12が摺動可能に当接してい
る。複数の一対のシュー12が、周方向に互いに間隔を
隔てて配設されている。各一対のシュー12は、それぞ
れピストン13の尾部に形成されたシュー保持部により
保持されている。ピストン13の筒部はシリンダボア1
aに摺動可能に挿入されている。 【0008】シリンダブロック1のセンターボア1b
は、図示しない冷媒通路を介して吸入室8に連通してい
る。センターボア1bと前記冷媒通路とによりピストン
13の筒部とシリンダボア1aとの摺接部を通りクラン
ク室3へ漏出した圧縮漏れ冷媒を、クランク室3から吸
入室8へ排出する排出路が形成されている。 【0009】センターボア1b内に逆止弁14が配設さ
れている。図2に示すように、逆止弁14は、開放端が
クランク室3へ差し向けられた有底筒状のケース14a
を有している。ケース14aはセンターボア1bに嵌合
している。ケース14aとセンターボア1bとの当接部
はOリング14bによりシールされている。ケース14
aの開放端に形成されたフランジに複数の係止穴14c
が形成されている。環状の弁座14dが、周縁部に形成
された複数の爪14d′を係止穴14cに係合させた状
態で、ケース14aの開放端に当接している。ケース1
4aの底壁に複数の通気穴14eが形成されている。ケ
ース14a内にバネ14fが配設されている。バネ14
fのクランク室3側の端部に弁体14gが固定されてい
る。ケース14aに、吸入室8側へ差し向けられた複数
の脚14hが形成されている。 【0010】本発明に係る斜板式圧縮機100において
は、駆動軸10が外部駆動源により回転駆動され、駆動
軸10の回転に伴って斜板11が回転し、シュー12を
介して斜板11によりピストン13が往復駆動される。
車両空調装置の冷却回路から圧縮機100へ還流した冷
媒ガスが、吸入ポートを介して吸入室8流入し、弁板6
に形成された吸入穴と吸入弁5とを介してシリンダボア
1a内へ吸引され、ピストン13により加圧圧縮され、
弁板6に形成された吐出穴と吐出弁7とを介して吐出室
9へ吐出し、吐出ポートを介して車両空調装置の冷却回
路へ還流する。 【0011】斜板式圧縮機100の運転時に、ピストン
13の筒部とシリンダボア1aとの摺接部を通って圧縮
漏れ冷媒ガスがクランク室3へ漏出する。斜板式圧縮機
100の運転時または停止直後で、圧縮漏れ冷媒ガスに
よってクランク室3内圧Pcが吸入室8内圧Psよりも
高く、クランク室3内圧Pcによって弁体14gに印加
される力が吸入室8内圧Psとバネ14fとによって弁
体14gに印加される力よりも大きい場合には、バネ1
4fの付勢力に抗して弁体14gが弁座14dから離
れ、センターボア1bと図示しない冷媒通路とにより形
成された排出路が開放される。この結果、クランク室3
内の圧縮漏れガスは排出路を介して吸入室8へ排出され
る。クランク室3内圧Pcと吸入室8内圧Psとの差圧
により、逆止弁14が弁板6方向へ移動しても、脚14
hが弁板6に当接するので、ケース14aの底壁に形成
された通気穴14eが他部材によって塞がれるおそれは
無い。 【0012】クランク室3内圧Pcが吸入室8内圧Ps
と同等以下になると、吸入室8内圧Psとバネ14fと
によって弁体14gに印加される力がクランク室3内圧
Pcによって弁体14gに印加される力よりも大きくな
り、弁体14gが弁座14dに当接し、センターボア1
bと図示しない冷媒通路とにより形成された排出路が閉
鎖される。斜板式圧縮機100の停止から時間が経過す
ると、斜板式圧縮機100の温度よりも空調装置冷却回
路のエバポレータやコンデンサー等の温度が高く、ひい
てはクランク室3内圧Pcよりも吸入室8内圧Psが高
く、且つ空調装置冷却回路のエバポレータやコンデンサ
ー内冷媒の温度が飽和温度よりも高い場合を生ずる。こ
のような場合でも、排出路が閉鎖されているので、吸入
室8の冷媒ガスはクランク室3へ逆流せず、クランク室
3には冷媒は溜まらない。従って、斜板式圧縮機100
の始動時に、斜板11やピストン13に付着している潤
滑油が、液冷媒によって洗い流されるおそれは無く、斜
板11とシュー12との摺接部、ピストン13とシリン
ダボア1aとの摺接部の潤滑油が不足し、前記摺接部が
金属接触となり磨耗するおそれも無い。 【0013】図3に示すように、一端がクランク室3に
連通し他端が吸入室8に連通する貫通穴24aが形成さ
れ、貫通穴24aの吸入室8側端部に上向きの漏斗状の
弁座24a′が形成され、弁座24a′に当接可能なゴ
ム、プラスチック等で形成された軽量の球状の弁体24
bが配設された柱状の逆止弁24をセンターボア1bに
嵌合させても良い。逆止弁24とセンターボア1bの当
接部はOリング24cによってシールする。クランク室
3内圧Pcが吸入室8内圧Psよりも高く、内圧Pcが
弁体24bに印加する力が、弁体24bの自重と内圧P
sが弁体24bに印加する力よりも大きい場合には、弁
体24bが弁座24a′から離れて、排出路が開放さ
れ、クランク室内圧Pcが吸入室Ps以下の場合には、
弁体24bは自重により弁座24a′に着座し、排出路
が閉鎖される。逆止弁14、24に代えて、リード弁を
有する逆止弁を配設しても良い。 【0014】図4に示す逆止弁34をセンターボア1b
に嵌合させても良い。逆止弁34は、開放端が吐出室9
へ差し向けられた有底筒状のケース34aを有してい
る。ケース34aのクランク室3側部位の外径は、吐出
室9側部位の外径よりも大きな値に設定されている。ケ
ース34aの大外径部はセンターボア1bに嵌合してい
る。ケース34aの大外径部とセンターボア1bとの当
接部はOリング34bによりシールされている。ケース
34aの通気穴が形成された底壁が弁座34cを形成し
ている。ケース34aの小外径部側壁に複数の通気穴3
4dが形成されている。ケース34aの開放端に形成さ
れたフランジに蓋34eが弾性係合している。ケース3
4a内に弁体34fが配設されている。弁体34fと蓋
34eとの間にバネ34gが配設されている。クランク
室3内圧Pcが吸入室8内圧Psよりも高く、クランク
室3内圧Pcによって弁体34fに印加される力が吸入
室8内圧Psとバネ34gとによって弁体34fに印加
される力よりも大きい場合には、バネ34gの付勢力に
抗して弁体34fが弁座34cから離れ、センターボア
1bと図示しない冷媒通路とにより形成された排出路が
開放される。この結果、クランク室3内の圧縮漏れガス
は排出路を介して吸入室8へ排出される。クランク室3
内圧Pcと吸入室8内圧Psとの差圧により、逆止弁3
4が弁板6方向へ移動しても、ケース34aの小外径部
側壁に形成された通気穴34dが他部材によって塞がれ
るおそれは無い。クランク室3内圧Pcが吸入室8内圧
Psと同等以下になると、吸入室8内圧Psとバネ34
gとによって弁体34fに印加される力がクランク室3
内圧Pcによって弁体34fに印加される力よりも大き
くなり、弁体34fが弁座34cに当接し、センターボ
ア1bと図示しない冷媒通路とにより形成された排出路
が閉鎖される。 【0015】 【発明の効果】以上説明したごとく、本発明に係る斜板
式圧縮機においては、圧縮機の運転時または停止直後で
圧縮漏れ冷媒ガスによってクランク室内圧が吸入室内圧
よりも高い場合には、排出路が開放されるので、クラン
ク室内の圧縮漏れガスは排出路を介して吸入室へ排出さ
れる。従ってクランク室には冷媒は溜まらない。圧縮機
の停止時にクランク室内圧が吸入室内圧以下になると、
排出路が閉鎖されるので、吸入室の冷媒ガスはクランク
室へ逆流しない。従って、クランク室には冷媒は溜まら
ない。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor. 2. Description of the Related Art A swash plate type compressor having a discharge path for discharging compressed leakage refrigerant leaked into a crank chamber through a gap between a piston and a cylinder bore from a crank chamber to an intake chamber is used in a vehicle air conditioner or the like. Widely used. [0003] The swash plate type compressor is stopped, and the temperature of the evaporator and the condenser of the air conditioner cooling circuit is higher than the compressor temperature, and thus the suction chamber is higher than the crank chamber pressure. When the pressure is high, and the temperature of the refrigerant in the evaporator or condenser of the air conditioner cooling circuit is higher than the saturation temperature, the refrigerant flows backward from the suction chamber to the crank chamber through the discharge path, is cooled and liquefied, and is cooled to the crank chamber. Accumulate. When the swash plate compressor starts, the lubricating oil adhering to the swash plate and the piston is washed away by the liquid refrigerant accumulated in the crank chamber, and discharged to the suction chamber through the discharge passage. As a result, the lubricating oil at the sliding contact portion between the swash plate and the shoe and the sliding contact portion between the piston and the cylinder bore is insufficient, and the sliding contact portion comes into metallic contact and is worn. The present invention has been made in view of the above-described problems, and is directed to a swash plate type compressor including a discharge path that discharges compressed leakage refrigerant leaked to a crank chamber through a gap between a piston and a cylinder bore from a crank chamber to a suction chamber. It is another object of the present invention to provide a swash plate compressor in which liquid refrigerant does not accumulate in a crank chamber when operation is stopped. [0004] In order to solve the above-mentioned problems, according to the present invention, the refrigerant leaking into the crank chamber through the gap between the piston and the cylinder bore is transferred from the crank chamber to the suction chamber. A discharge path for discharging, and a check valve for opening the discharge path when the pressure in the crank chamber is higher than the suction chamber pressure, and closing the discharge path when the pressure in the crank chamber is equal to or lower than the suction chamber pressure. Provide a swash plate type compressor. In the swash plate type compressor according to the present invention, when the pressure in the crank chamber is higher than the pressure in the suction chamber due to the compression leaking refrigerant gas during or immediately after the operation of the compressor, the discharge path is opened. The compressed leakage gas is discharged to the suction chamber via the discharge path. If the pressure in the crank chamber becomes equal to or lower than the pressure in the suction chamber when the compressor is stopped, the discharge path is closed, so that the refrigerant gas in the suction chamber does not flow back to the crank chamber. Therefore, the refrigerant does not accumulate in the crank chamber. [0005] A swash plate type compressor according to an embodiment of the present invention will be described. As shown in FIG. 1, the swash plate type compressor 100
A cylinder block 1 having a plurality of cylinder bores 1a and a center bore 1b; and a front housing 2 forming a crank chamber 3 in cooperation with the cylinder block 1.
And The cylinder head 4 cooperates with the cylinder block 1 to hold the suction valve 5, the valve plate 6, and the discharge valve 7. A suction chamber 8 and a discharge chamber 9 are formed in the cylinder head 4. The suction chamber 8 communicates with a suction port (not shown), and the discharge chamber 9 communicates with a discharge port (not shown).
The suction port and the discharge port are connected to a cooling circuit of a vehicle air conditioner (not shown). The swash plate type compressor 100 further includes a drive shaft 10 extending in the crank chamber 3. One end of the drive shaft 10 extends out of the front housing 2 through the front housing 2 and the other end thereof has a center bore 1 of the cylinder block.
b. [0007] A swash plate 11 disposed in the crank chamber 3 is fixed to the drive shaft 10. A pair of shoes 12 slidably abut the swash plate 11 with the swash plate 11 interposed therebetween. A plurality of pairs of shoes 12 are arranged at intervals in the circumferential direction. Each pair of shoes 12 is held by a shoe holding portion formed at the tail of the piston 13. The cylinder of the piston 13 is the cylinder bore 1
a so as to be slidable. [0008] Center bore 1b of cylinder block 1
Communicates with the suction chamber 8 via a refrigerant passage (not shown). The center bore 1b and the refrigerant passage form a discharge passage for discharging the compressed leakage refrigerant leaked to the crank chamber 3 through the sliding contact between the cylinder portion of the piston 13 and the cylinder bore 1a from the crank chamber 3 to the suction chamber 8. ing. A check valve 14 is provided in the center bore 1b. As shown in FIG. 2, the check valve 14 has a bottomed cylindrical case 14 a having an open end directed toward the crank chamber 3.
have. The case 14a is fitted in the center bore 1b. The contact portion between the case 14a and the center bore 1b is sealed by an O-ring 14b. Case 14
a plurality of locking holes 14c in the flange formed at the open end of
Is formed. The annular valve seat 14d is in contact with the open end of the case 14a in a state where the plurality of claws 14d 'formed on the periphery are engaged with the locking holes 14c. Case 1
A plurality of ventilation holes 14e are formed in the bottom wall of 4a. A spring 14f is provided in the case 14a. Spring 14
A valve body 14g is fixed to an end of the crankcase 3 on the side of f. A plurality of legs 14h directed toward the suction chamber 8 are formed in the case 14a. In the swash plate type compressor 100 according to the present invention, the drive shaft 10 is rotationally driven by an external drive source, the swash plate 11 rotates with the rotation of the drive shaft 10, and the swash plate 11 As a result, the piston 13 is reciprocated.
The refrigerant gas recirculated from the cooling circuit of the vehicle air conditioner to the compressor 100 flows into the suction chamber 8 through the suction port, and the valve plate 6
Is sucked into the cylinder bore 1a through the suction hole formed in the cylinder and the suction valve 5, and is compressed and compressed by the piston 13,
It discharges to the discharge chamber 9 through a discharge hole formed in the valve plate 6 and the discharge valve 7, and returns to the cooling circuit of the vehicle air conditioner through the discharge port. During the operation of the swash plate type compressor 100, the refrigerant gas leaking through the compressor leaks into the crank chamber 3 through the sliding contact between the cylindrical portion of the piston 13 and the cylinder bore 1 a. During or immediately after the operation of the swash plate type compressor 100, the internal pressure Pc of the crank chamber 3 is higher than the internal pressure Ps of the suction chamber 8 due to the compressed leakage refrigerant gas, and the force applied to the valve body 14g by the internal pressure Pc of the crank chamber 3 is reduced. 8 If the force applied to the valve element 14g by the internal pressure Ps and the spring 14f is greater than
The valve body 14g separates from the valve seat 14d against the urging force of 4f, and the discharge passage formed by the center bore 1b and the refrigerant passage (not shown) is opened. As a result, the crankcase 3
The compressed leak gas inside is discharged to the suction chamber 8 via the discharge path. Due to the pressure difference between the internal pressure Pc of the crank chamber 3 and the internal pressure Ps of the suction chamber 8, even if the check valve 14 moves toward the valve plate 6,
Since h is in contact with the valve plate 6, there is no possibility that the ventilation hole 14e formed in the bottom wall of the case 14a is closed by another member. The internal pressure Pc of the crank chamber 3 is equal to the internal pressure Ps of the suction chamber 8.
When the pressure becomes equal to or less than the force applied to the valve element 14g by the internal pressure Ps of the suction chamber 8 and the spring 14f, the force applied to the valve element 14g by the internal pressure Pc of the crank chamber 3 becomes greater than the force applied to the valve element 14g. Abuts 14d, center bore 1
The discharge passage formed by b and the refrigerant passage (not shown) is closed. After a lapse of time from the stop of the swash plate type compressor 100, the temperature of the evaporator and the condenser of the air conditioner cooling circuit is higher than the temperature of the swash plate type compressor 100, and the internal pressure Ps of the suction chamber 8 is higher than the internal pressure Pc of the crank chamber 3. In some cases, the temperature is high and the temperature of the refrigerant in the evaporator or the condenser in the air conditioner cooling circuit is higher than the saturation temperature. Even in such a case, since the discharge path is closed, the refrigerant gas in the suction chamber 8 does not flow back to the crank chamber 3, and the refrigerant does not accumulate in the crank chamber 3. Therefore, the swash plate type compressor 100
There is no danger that the lubricating oil adhering to the swash plate 11 and the piston 13 will be washed away by the liquid refrigerant at the start of the operation, and the sliding contact portion between the swash plate 11 and the shoe 12 and the sliding contact portion between the piston 13 and the cylinder bore 1a. Insufficient lubricating oil is used, and there is no possibility that the sliding contact portion is brought into metallic contact and is worn. As shown in FIG. 3, a through hole 24a having one end communicating with the crank chamber 3 and the other end communicating with the suction chamber 8 is formed, and an upward funnel-shaped funnel is formed at the end of the through hole 24a on the suction chamber 8 side. A valve seat 24a 'is formed, and a lightweight spherical valve body 24 made of rubber, plastic, or the like, which can contact the valve seat 24a'.
The column-shaped check valve 24 provided with b may be fitted to the center bore 1b. The contact portion between the check valve 24 and the center bore 1b is sealed by an O-ring 24c. The internal pressure Pc of the crank chamber 3 is higher than the internal pressure Ps of the suction chamber 8, and the force applied to the valve body 24b by the internal pressure Pc is equal to the weight of the valve body 24b and the internal pressure Ps.
When s is greater than the force applied to the valve body 24b, the valve body 24b is separated from the valve seat 24a ', the discharge path is opened, and when the crank chamber pressure Pc is equal to or lower than the suction chamber Ps,
The valve element 24b is seated on the valve seat 24a 'by its own weight, and the discharge path is closed. Instead of the check valves 14 and 24, a check valve having a reed valve may be provided. The check valve 34 shown in FIG.
May be fitted. The check valve 34 has an open end at the discharge chamber 9.
It has a bottomed cylindrical case 34a directed to the side. The outer diameter of the case 34a on the side of the crank chamber 3 is set to a value larger than the outer diameter of the part on the side of the discharge chamber 9. The large outer diameter portion of the case 34a is fitted in the center bore 1b. The contact portion between the large outer diameter portion of the case 34a and the center bore 1b is sealed by an O-ring 34b. The bottom wall of the case 34a where the ventilation holes are formed forms a valve seat 34c. A plurality of ventilation holes 3 are formed in the small outer diameter side wall of the case 34a.
4d is formed. A lid 34e is elastically engaged with a flange formed at the open end of the case 34a. Case 3
A valve body 34f is provided in 4a. A spring 34g is provided between the valve body 34f and the lid 34e. The internal pressure Pc of the crank chamber 3 is higher than the internal pressure Ps of the suction chamber 8, and the force applied to the valve body 34f by the internal pressure Pc of the crank chamber 3 is higher than the force applied to the valve body 34f by the internal pressure Ps of the suction chamber 8 and the spring 34g. If larger, the valve body 34f separates from the valve seat 34c against the urging force of the spring 34g, and the discharge passage formed by the center bore 1b and the refrigerant passage (not shown) is opened. As a result, the compressed leakage gas in the crank chamber 3 is discharged to the suction chamber 8 via the discharge path. Crank chamber 3
Due to the differential pressure between the internal pressure Pc and the internal pressure Ps of the suction chamber 8, the check valve 3
Even if 4 moves in the direction of the valve plate 6, there is no possibility that the ventilation hole 34d formed in the small outer diameter side wall of the case 34a will be closed by another member. When the internal pressure Pc of the crank chamber 3 becomes equal to or less than the internal pressure Ps of the suction chamber 8, the internal pressure Ps of the suction chamber 8 and the spring 34
g and the force applied to the valve body 34f
The force applied to the valve body 34f by the internal pressure Pc becomes larger, the valve body 34f comes into contact with the valve seat 34c, and the discharge path formed by the center bore 1b and the refrigerant passage (not shown) is closed. As described above, in the swash plate compressor according to the present invention, when the pressure in the crank chamber is higher than the pressure in the suction chamber due to compression leakage refrigerant gas during or immediately after operation of the compressor. Since the discharge passage is opened, the compressed leakage gas in the crank chamber is discharged to the suction chamber via the discharge passage. Therefore, no refrigerant accumulates in the crank chamber. If the pressure in the crank chamber drops below the suction chamber pressure when the compressor is stopped,
Since the discharge path is closed, the refrigerant gas in the suction chamber does not flow back to the crank chamber. Therefore, the refrigerant does not accumulate in the crank chamber.

【図面の簡単な説明】 【図1】本発明の実施例に係る斜板式圧縮機の断面図で
ある。 【図2】図1の部分拡大図である。 【図3】本発明の他の実施例に係る斜板式圧縮機の断面
図である。 【図4】本発明の他の実施例に係る斜板式圧縮機の部分
拡大断面図である。 【符号の説明】 1 シリンダブロック 1a シリンダボア 1b センターボア 2 フロントハウジング 3 クランク室 4 シリンダヘッド 8 吸入室 11 斜板 12 シュー 13 ピストン 14、24、34 逆止弁
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a swash plate compressor according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a sectional view of a swash plate type compressor according to another embodiment of the present invention. FIG. 4 is a partially enlarged sectional view of a swash plate type compressor according to another embodiment of the present invention. [Description of Signs] 1 Cylinder block 1a Cylinder bore 1b Center bore 2 Front housing 3 Crank chamber 4 Cylinder head 8 Suction chamber 11 Swash plate 12 Shoe 13 Piston 14, 24, 34 Check valve

Claims (1)

【特許請求の範囲】 【請求項1】 ピストンとシリンダボアとの間の隙間を
通りクランク室へ漏出した圧縮漏れ冷媒をクランク室か
ら吸入室へ排出する排出路と、クランク室内圧が吸入室
内圧より高い場合に排出路を開放し、クランク室内圧が
吸入室内圧以下の場合に排出路を閉鎖する逆止弁とを備
えることを特徴とする斜板式圧縮機。
Claims: 1. A discharge path for discharging compressed leakage refrigerant leaking into a crank chamber through a gap between a piston and a cylinder bore from a crank chamber to a suction chamber, and a pressure in the crank chamber being higher than a pressure in the suction chamber. A swash plate compressor comprising: a check valve that opens a discharge passage when the pressure is high and closes the discharge passage when a pressure in the crank chamber is equal to or lower than a pressure in the suction chamber.
JP2001382429A 2001-12-17 2001-12-17 Swash plate type compressor Withdrawn JP2003184738A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2001382429A JP2003184738A (en) 2001-12-17 2001-12-17 Swash plate type compressor
US10/315,975 US20030118456A1 (en) 2001-12-17 2002-12-11 Swash plate-type compressors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001382429A JP2003184738A (en) 2001-12-17 2001-12-17 Swash plate type compressor

Publications (1)

Publication Number Publication Date
JP2003184738A true JP2003184738A (en) 2003-07-03

Family

ID=19187481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001382429A Withdrawn JP2003184738A (en) 2001-12-17 2001-12-17 Swash plate type compressor

Country Status (2)

Country Link
US (1) US20030118456A1 (en)
JP (1) JP2003184738A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100675547B1 (en) 2005-04-06 2007-01-30 가부시키가이샤 도요다 지도숏키 Piston type compressor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004013096A1 (en) * 2004-03-17 2005-10-13 Zexel Valeo Compressor Europe Gmbh Compressor, in particular axial piston compressor for a vehicle air conditioning
JP5458965B2 (en) * 2010-03-08 2014-04-02 株式会社豊田自動織機 Capacity control mechanism in variable capacity compressor
CN102913418B (en) * 2011-08-03 2015-08-12 陈海水 High-efficiency gain type air compression structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429679A (en) * 1987-07-24 1989-01-31 Sanden Corp Capacity variable swash plate type compressor
JPH0746787Y2 (en) * 1987-12-08 1995-10-25 サンデン株式会社 Variable capacity scroll compressor
JPH03100375A (en) * 1989-09-11 1991-04-25 Toyooki Kogyo Co Ltd Oil hydraulic pump
JP3820766B2 (en) * 1998-03-06 2006-09-13 株式会社豊田自動織機 Compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100675547B1 (en) 2005-04-06 2007-01-30 가부시키가이샤 도요다 지도숏키 Piston type compressor

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