JP4063568B2 - Horizontal multistage compression rotary compressor - Google Patents

Horizontal multistage compression rotary compressor Download PDF

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Publication number
JP4063568B2
JP4063568B2 JP2002090282A JP2002090282A JP4063568B2 JP 4063568 B2 JP4063568 B2 JP 4063568B2 JP 2002090282 A JP2002090282 A JP 2002090282A JP 2002090282 A JP2002090282 A JP 2002090282A JP 4063568 B2 JP4063568 B2 JP 4063568B2
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oil
rotary compression
sealed container
baffle plate
electric
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JP2003286987A (en
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俊行 江原
兼三 松本
孝 佐藤
大 松浦
里  和哉
裕之 松森
隆泰 斎藤
晴久 山崎
昌也 只野
悟 今井
淳志 小田
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三洋電機株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C18/3562Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
    • F04C18/3564Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008Hermetic pumps

Description

【0001】
【発明の属する技術分野】
本発明は、第1の回転圧縮要素で圧縮されて密閉容器内に吐出された冷媒ガスを第2の回転圧縮要素に吸引し、圧縮して吐出する横型多段圧縮式ロータリコンプレッサに関するものである。
【0002】
【従来の技術】
二酸化炭素(CO2)を冷媒として使用し、第1の回転圧縮要素と第2の回転圧縮要素から成る回転圧縮機構部を備える多段圧縮式ロータリコンプレッサ、特に内部中間圧型の多段圧縮式ロータリコンプレッサは、通常縦型の密閉容器内上部に電動要素を配置し、下部に当該電動要素の回転軸で駆動される回転圧縮機構部を配置して構成されている。そして、第1の回転圧縮要素の吸込ポートからCO2冷媒ガスがシリンダの低圧室側に吸入され、ローラとベーンの動作により圧縮されて中間圧となり、シリンダの高圧室側より吐出ポート、吐出消音室を経て密閉容器内に吐出される。
【0003】
この密閉容器内の中間圧の冷媒ガスは第2の回転圧縮要素の吸込ポートからシリンダの低圧室側に吸入され、ローラとベーンの動作により2段目の圧縮が行われて高温高圧の冷媒ガスとなり、高圧室側より吐出ポート、吐出消音室を経て、コンプレッサ外部の放熱器に流入する構成とされていた。
【0004】
また、係る縦型のロータリコンプレッサでは、回転圧縮機構部の下方に位置する密閉容器内底部がオイル溜めとされており、回転軸下端に構成された給油手段としてのオイルポンプによりオイル溜めからオイルが吸引され、回転圧縮機構部に供給されて回転圧縮機構部や回転軸の摺動部の摩耗等を防いでいた。
【0005】
【発明が解決しようとする課題】
ところで、このような多段圧縮式ロータリコンプレッサを横型として用いた場合、第1の回転圧縮要素にて圧縮された冷媒ガスと共に密閉容器内に吐出されたオイルは回転圧縮機構部側だけで無く、電動要素側の密閉容器底部にも溜まるようになる。そのため、回転軸の回転圧縮機構部側の端部に構成されるオイルポンプによるオイルの吸引が円滑に行えなくなる問題が生じる。
【0006】
また、2段目となる第2の回転圧縮要素に吸い込まれる冷媒ガスは密閉容器内にあるため、この第2の回転圧縮要素に吸い込まれる冷媒ガスとオイルを良好に分離しないと、第2の回転圧縮要素から外部に大量のオイルが吐出されて密閉容器内におけるオイル不足が発生する原因となる。
【0007】
本発明は、係る技術的課題を解決するために成されたものであり、所謂内部中間圧型の多段圧縮式ロータリコンプレッサを横型として用いる場合に、摺動部へのオイルの供給を円滑に行えるようにすることを目的とする。
【0008】
【課題を解決するための手段】
即ち、請求項1の発明は横型の密閉容器内に電動要素と、該電動要素にて駆動される第1及び第2の回転圧縮要素から成る回転圧縮機構部とを備え、前記第1の回転圧縮要素で圧縮された冷媒ガスを前記密閉容器内に吐出し、更にこの吐出された中間圧の冷媒ガスを前記第2の回転圧縮要素で圧縮する横型多段圧縮式ロータリコンプレッサであって、密閉容器内の底部に設けられ、該密閉容器内に封入されたオイルを貯留するためのオイル溜めと、密閉容器内を電動要素側と回転圧縮機構部側とに区画して差圧を構成するためのバッフル板と、該バッフル板の回転圧縮機構部側に設けられ、密閉容器内に封入されたオイルを回転圧縮機構部に供給するための給油手段と、密閉容器内における前記バッフル板の前記回転圧縮機構部側の冷媒ガスを前記第2の回転圧縮要素に吸い込ませるための吸気通路と、密閉容器内におけるバッフル板の電動要素側と回転圧縮機構部側とを連通する連通管とを備え、第1の回転圧縮要素で圧縮された冷媒ガスを前記バッフル板の前記電動要素側に吐出させると共に、連通管の一端は、前記バッフル板の前記電動要素側における前記密閉容器内下部の前記オイル溜めのオイルの油面より低い位置にて開口し、他端は前記バッフル板の前記回転圧縮要素側における前記オイル溜めのオイルの油面より高い位置にて開口しているものである
【0009】
請求項2の発明は横型の密閉容器内に電動要素と、該電動要素にて駆動される第1及び第2の回転圧縮要素から成る回転圧縮機構部とを備え、前記第1の回転圧縮要素で圧縮された冷媒ガスを前記密閉容器内に吐出し、更にこの吐出された中間圧の冷媒ガスを前記第2の回転圧縮要素で圧縮する横型多段圧縮式ロータリコンプレッサであって、前記密閉容器内の底部に設けられ、該密閉容器内に封入されたオイルを貯留するためのオイル溜めと、前記密閉容器内を前記電動要素側と回転圧縮機構部側とに区画して差圧を構成するためのバッフル板と、該バッフル板の前記回転圧縮機構部側に設けられ、前記密閉容器内に封入されたオイルを前記回転圧縮機構部に供給するための給油手段と、前記密閉容器内における前記バッフル板の前記回転圧縮機構部側の冷媒ガスを前記第2の回転圧縮要素に吸い込ませるための吸気通路と、前記密閉容器内における前記バッフル板の前記電動要素側と回転圧縮機構部側とを連通する連通管とを備え、前記第1の回転圧縮要素で圧縮された冷媒ガスを前記バッフル板の前記電動要素側に吐出させると共に、
前記連通管の一端は、前記バッフル板の前記電動要素側における前記密閉容器内下部の前記オイル溜めのオイルの油面より低い位置にて開口し、他端は前記密閉容器の底面から前記バッフル板の高さ寸法の10%より高い位置で、前記オイル溜めのオイルの油面より高い位置の当該バッフル板の前記回転圧縮要素側に開口しているものである。
【0010】
請求項3の発明では閉容器と前記バッフル板との間隔を密閉容器の内径に対して5%以下としたものである。
【0011】
【発明の実施の形態】
次に、図面に基づき本発明の実施形態を詳述する。図1は本発明の横型多段圧縮式ロータリコンプレッサの実施例としての第1及び第2の回転圧縮要素32、34を備えた内部中間圧型の横型多段(2段)圧縮式ロータリコンプレッサ10の縦断側面図、図2は図1のロータリコンプレッサ10の平断面図をそれぞれ示している。
【0012】
各図において、実施例のロータリコンプレッサ10は二酸化炭素(CO2)を冷媒とする内部中間圧型の横型多段圧縮式ロータリコンプレッサで、このロータリコンプレッサ10は両端が密閉された横長円筒状の密閉容器12を備え、この密閉容器12の底部をオイル溜めとしている。この密閉容器12内には電動要素14と、電動要素14の回転軸16により駆動される第1の回転圧縮要素32及び第2の回転圧縮要素34からなる回転圧縮機構部18が収納されている。
【0013】
密閉容器12の電動要素14側の端部には円形の取付孔12Dが形成されており、この取付孔12Dには電動要素14に電力を供給するためのターミナル20が取り付けられている。
【0014】
電動要素14は密閉容器12の内周面に沿って環状に取り付けられたステータ22と、このステータ22の内側に若干の間隔を設けて挿入設置されたロータ24とからなる。このロータ24は中心を通り密閉容器12の軸心方向に延在する回転軸16に固定されている。
【0015】
回転軸16の回転圧縮機構部18側の端部には給油手段としてのオイルポンプ101が形成されている。このオイルポンプ101は、密閉容器12内の底部に形成されたオイル溜めから潤滑油としてのオイルを吸い上げて回転圧縮機構部18の摺動部に供給して摩耗を防止するために設けられており、このオイルポンプ101からは密閉容器12の底部に向かってオイル吸上パイプ101Aが降下し、オイル溜めにて開口している。
【0016】
また、前記ステータ22は、ドーナッツ状の電磁鋼板を積層した積層体26と、この積層体26の歯部に直巻き(集中巻き)方式により巻装されたステータコイル28を有している。そして、前記ロータ24もステータ22と同様に電磁鋼板の積層体30で形成され、この積層体30内に永久磁石MGを挿入して形成されている。
【0017】
前記第1の回転圧縮要素32と第2の回転圧縮要素34は第1及び第2のシリンダ38、40により構成され、これらシリンダ38、40間には中間仕切板36が狭持されている。即ち、回転圧縮機構部18は、第1の回転圧縮要素32及び第2の回転圧縮要素34と、中間仕切板36とから構成されている。また、第1及び第2の回転圧縮要素32、34は、それぞれ中間仕切板36の両側(図1では左右)に配置された第1及び第2のシリンダ38、40と、180度の異相差を有して回転軸16に設けられた第1及び第2の偏心部42、44に嵌合され、第1及び第2のシリンダ38、40内を偏心回転する第1及び第2のローラ46、48と、これらローラ46、48にそれぞれ当接してシリンダ38、40内をそれぞれ低圧室側と高圧室側とに区画する第1及び第2のベーン50、52と、シリンダ38の電動要素14側の開口面とシリンダ40の電動要素14とは反対側の開口面をそれぞれ閉塞して回転軸16の軸受けを兼用する支持部材54、56とから構成されている。
【0018】
ベーン50、52の外側(図1では下側)には、ベーン50、52の外側端部に当接して、常時ベーン50、52をローラ46、48側に付勢するスプリング74、76が設けられている。更に、スプリング74、76の密閉容器12側には金属製のプラグ122、123が設けられ、スプリング74、76の抜け止めの役目を果たす。また、第1のベーン50には図示しない背圧室が構成され、この背圧室にはシリンダ38内の高圧室側の圧力が背圧として印加される。
【0019】
また、支持部材54、56には、吸込ポート161、162にてシリンダ38、40内部の低圧室側とそれぞれ連通する吸込通路58、60と、一部を凹陥させ、この凹陥部を後述するバッフル板100及びカバー68にてそれぞれ閉塞することにより形成される吐出消音室62、64とが設けられている。即ち、吐出消音室62は支持部材54の凹陥部をバッフル板100にて閉塞することにより、吐出消音室64は支持部材56の凹陥部をカバー68にて閉塞することにより形成されている。
【0020】
吐出消音室64と密閉容器12内は、シリンダ38、40や中間仕切板36、バッフル板100を貫通して電動要素14側に開口する図示しない連通路にて連通されており、連通路の端部には中間吐出管121が立設され、この中間吐出管121から第1の回転圧縮要素32で圧縮された中間圧の冷媒ガスが密閉容器12内の電動要素14側に吐出される。このとき、冷媒ガス中には第1の回転圧縮要素32に供給されたオイルが混入しているが、このオイルも密閉容器12内の電動要素14側に吐出されることになる。ここで、冷媒ガス中に混入したオイルは冷媒ガスから分離して密閉容器12内底部のオイル溜めに溜まる。
【0021】
そして、前述したバッフル板100は密閉容器12内を電動要素14側と回転圧縮機構部18側とに区画して、密閉容器12内に差圧を構成するために設けられる。このバッフル板100は、ドーナッツ状の鋼板からなるもので、前記密閉容器12とは所定の間隔Sを存して設けられている。この間隔Sは、密閉容器12の内径をD1、バッフル板100の外径をD2とした場合、S=D1−D2で表され、間隔Sは密閉容器12の内径に対して5%以下((S/D1)×100が5%以下)となるように設定されている。従って、密閉容器12の内面とバッフル板100の外縁との間、即ち半径方向の間隔S/2は密閉容器12の内径D1に対して2.5%以下となる。
【0022】
本実施例では、この半径方向の間隔S/2を2mm以下としており、具体的には、密閉容器12の内径D1を109mm、バッフル板100の外径D2を106mmとしている。これにより、半径方向の間隔S/2は1.5mmとなる(間隔Sは密閉容器12の内径D1に対して2.8%、半径方向の間隔S/2は密閉容器12の内径D1に対して1.38%)。
【0023】
このように、間隔Sを密閉容器12の内径D1に対して5%以下(半径方向の間隔S/2は密閉容器12の内径D1に対して2.5%以下)とすることにより、バッフル板100を介して、電動要素14側と回転圧縮機構部18側との間に所望の差圧を構成することができる。
【0024】
ここで、第1の回転圧縮要素32で圧縮され、密閉容器12内の電動要素14側に吐出された中間圧の冷媒ガスの一部は、密閉容器12とバッフル板100の間に形成された間隔Sを通って回転圧縮機構部18側に流入することになるが、係るバッフル板100の存在により、密閉容器12内にはバッフル板100の電動要素14側の圧力は高く、回転圧縮機構部18側が低い差圧が構成される。また、バッフル板100は、前述のように支持部材54の一部を凹陥させて形成した吐出消音室62のカバーを兼ねているので、部品点数の削減による構造の簡素化とコストの低減並びに寸法の小型化を図ることができるようになる。
【0025】
尚、密閉容器12内には、電動要素14側と回転圧縮機構部18側とを連通する連通管130が設けられている。連通管130は電動要素14側のオイルと冷媒ガスとを回転圧縮機構部18側に供給するために設けられている。バッフル板100の電動要素14側における密閉容器12内の下部のオイル溜めのオイルの油面より低い位置に一端の開口部135が開口し、電動要素14のバッフル板100側の軸心方向に延在して、密閉容器12の上部に向かって起立した後、バッフル板100を貫通して、バッフル板100の回転圧縮機構部18側に他端の開口部136が開口しており、回転圧縮機構部18側に連通するように形成されている。
【0026】
ここで、バッフル板100の回転圧縮機構部18側に設けられた連通管130他端の開口部136は、密閉容器12の底部のバッフル板100の高さ寸法の40%の位置に設けられている。これは密閉容器12内の底部のオイル溜めのオイルの油面より高い位置であるため、他端の開口部136から回転圧縮機構部18側に流入する冷媒ガスとオイルとが、オイル溜めのオイルと接することにより生じるオイルの発泡を未然に回避できると共に、冷媒ガスとオイルとを分離するための特別なオイル分離機構を設けることなく、冷媒ガスとオイルとを分離することができるようになる。
【0027】
そして、前述する差圧によって密閉容器12内底部のオイル溜めに貯溜されたオイルは連通管130を通って回転圧縮機構部18側に流入し、バッフル板100より回転圧縮機構部18側のオイルレベルが上昇する。これにより、オイル吸上ポンプ101Aの開口は支障なくオイルに浸漬されるようになるので、オイルポンプ101による回転圧縮機構部18の摺動部へのオイルの供給が円滑に行われるようになる。
【0028】
また、このバッフル板100には、密閉容器12内の中間圧の冷媒ガスを第2の回転圧縮要素34に導入するために、前述した吸込通路58と連通する吸気通路102が設けられている。この吸気通路102の吸気口104は、バッフル板100の回転圧縮機構部18側の上部に開口しており、この吸気口104から中間圧の冷媒ガスを吸入する。そして、この吸気通路102はバッフル板100内を貫通し、バッフル板100の電動要素14側を配管が通過した後、バッフル板を貫通して吸込通路58と連通するように構成されている。
【0029】
そして、吸気通路102の取付箇所以外の部分は当該バッフル板100から離間して設けられている。これにより、回転圧縮機構部18の熱により吸気通路102が加熱され難くなるので、この吸気通路102内を通過して第2の回転圧縮要素34に導入される冷媒ガスも加熱され難くなり、第2の回転圧縮要素34における圧縮効率の向上を図ることができるようになる。また、吸気通路102が回転圧縮機構部18と干渉することが無くなり、密閉容器12内の部品配置が容易となる。そして、吸気通路102の吸気口104は、中間吐出管121が開口する電動要素14側とはバッフル板100を挟んで反対側の回転圧縮機構部18側上部にて開口しているので、吸気通路102に吸い込まれる冷媒ガスのオイル分離が円滑に行われるようになる。
【0030】
更に、前述の如く密閉容器12とバッフル板100との間隔Sを密閉容器12の内径D1に対して5%以下としたので、第1の回転圧縮要素32で圧縮されてバッフル板100の電動要素14側に吐出された冷媒ガスとオイルとは、専ら連通管130を通ってバッフル板100の回転圧縮機構部18側に供給されるため、確実に冷媒ガスとオイルとを分離することができるようになるものである。
【0031】
そして、この場合冷媒としては、地球環境にやさしく可燃性及び毒性等を考慮して自然冷媒である前記二酸化炭素(CO2)を使用し、密閉容器12内に封入される潤滑油としてのオイルとしては、例えば鉱物油(ミネラルオイル)、アルキルベンゼン油、エーテル油、エステル油、PAG(ポリアルキルグリコール)等既存のオイルが使用される。
【0032】
密閉容器12の側面には、支持部材56と54の側部に対応する位置にスリーブ142、143がそれぞれ溶接固定されている。そして、スリーブ142内にはシリンダ40に冷媒を導入するための冷媒導入管94の一端が挿入接続され、吸込通路60に連通されている。また、スリーブ143内には冷媒吐出管96が挿入され、この冷媒導入管96の一端は吐出消音室62に連通されている。更に、密閉容器12の底部には取付用台座110が設けられている(図2では図示しない)。
【0033】
以上の構成で次にロータリコンプレッサ10の動作を説明する。ターミナル20及び図示しない配線を介して電動要素14もステータコイル28に通電されると、電動要素14が起動してロータ24が回転する。この回転により回転軸16と一体に設けられた偏心部42、44に嵌合されてローラ46、48がシリンダ38、40内を偏心回転する。
【0034】
これにより、冷媒導入管94及び支持部材56に形成された吸込通路60を経由して吸込ポート162から第1の回転圧縮要素32のシリンダ40の低圧室側に低圧の冷媒ガスが吸入され、ローラ48とベーン52の動作により圧縮されて中間圧となり、シリンダ40の高圧室側より図示しない連通路を経て中間吐出管121から密閉容器12内の電動要素14側に吐出される。このとき、密閉容器12内の電動要素14側に吐出された中間圧の冷媒ガス中には、第1の回転圧縮要素32に供給されたオイルが混入しており、このオイルは分離して密閉容器12内底部のオイル溜めに溜まる。そして、冷媒ガスの一部はバッフル板100と密閉容器12との間に形成された僅かな間隔Sから回転圧縮機構部18側に流入する。
【0035】
ここで、冷媒ガスがバッフル板100と密閉容器12との間に形成された間隔Sを通過するという作用により、前述の如く密閉容器12内の圧力は、電動要素14側より回転圧縮機構部18側の方が低くなる。
【0036】
これにより、冷媒ガスとオイルとはこの差圧により密閉容器12内の電動要素14の下部に形成された連通管130の一端の開口部135から連通管130内に流入し、容易に他端の開口部136から回転圧縮機構部18側に供給される。
【0037】
そして、連通管130の他端の開口部136は、密閉容器12内の底部に設けられたオイル溜めに貯留するオイルの油面より高い位置にて開口しているので、オイル溜めのオイルが発泡すること無く、冷媒ガスとオイルとが分離され、オイルは密閉容器12内の底部に形成された回転圧縮機構部18側のオイル溜めに戻る。
【0038】
一方、回転圧縮機構部18側に流入した中間圧の冷媒ガスは吸気口104から吸気通路102内に流入する。吸気通路102内に流入した冷媒ガスは、内部を通過して吸込通路58に流入し、吸込ポート161から第2の回転圧縮要素34のシリンダ38の低圧室側に吸入される。吸入された中間圧の冷媒ガスは、ローラ46とベーン50の回転により2段目の圧縮が行われて高温高圧の冷媒ガスとなり、高圧室側から図示しない吐出ポートを通り、支持部材54に形成された吐出消音室62、冷媒吐出管96を経て外部の放熱器に流入する。
【0039】
このように、電動要素14側と回転圧縮機構部18側とに区画して差圧を構成するためのバッフル板100を設けることにより、密閉容器12内底部に溜まるオイルはバッフル板100の回転圧縮機構部18側に移動し、そこに設けられたオイルポンプ101により吸入されるようになるので、回転圧縮機構部18などの摺動部への給油を円滑に行うことができるようになる。
【0040】
特に、密閉容器12内におけるバッフル板100の回転圧縮機構部18側の冷媒ガスを第2の回転圧縮要素34に吸い込ませるための吸気通路102と、密閉容器12内におけるバッフル板100の電動要素14側と回転圧縮機構部18側とを連通する連通管130とを備え、第1の回転圧縮要素32で圧縮された冷媒ガスをバッフル板100の電動要素14側に吐出させると共に、連通管130の一端は、バッフル板100の電動要素14側における密閉容器12内の下部のオイル溜めのオイルの油面より低い位置にて開口し、他端はバッフル板100の回転圧縮機構部18側におけるオイル溜めのオイルの油面より高い位置にて開口しているので、オイルと冷媒ガスとを分離するための特別なオイル分離機構を設けることなく、オイルと冷媒ガスとを分離することができるようになると共に、バッフル板100の電動要素14側に吐出された冷媒ガスを連通管130で回転圧縮機構部18側に戻してから吸気通路102により第2の回転圧縮要素34に吸い込ませることで、冷媒ガスと当該冷媒ガス中に混入するオイルとがより一層分離できるようになる。
【0041】
更に、コンプレッサ10が電動要素14側に低く傾斜した場合にもバッフル板100の電動要素14側における密閉容器12内の下部のオイル溜めのオイルの油面より低い位置にて開口している連通管130の一端から確実にオイルと冷媒ガスを回転圧縮機構部18側に供給することができようになるため、車載に好適となる。
【0042】
また、密閉容器12とバッフル板100との間隔Sを密閉容器12の内径D1に対して5%以下としたので、第1の回転圧縮要素32で圧縮されてバッフル板100の電動要素14側に吐出された冷媒ガスとオイルとは、専ら連通管130を通ってバッフル板100の回転圧縮機構部18側に供給され、確実にオイルを分離することができるようになる。
【0043】
実施例では連通管130の他端の開口部136を密閉容器12の底面のバッフル板100の高さ寸法の40%の位置に設けたが、これに限らず、油面の高さにより連通管130の他端の開口部136の位置は適宜決めるものとする。尚、本実施例においてはオイルの油面がバッフル板100の高さ寸法の10%未満であるため、開口部136をバッフル板100の高さ寸法の10%の位置に設ければ、オイル分離は可能となる。この場合には、連通管130の長さを最小限に抑えることができ、これによりコストの削減を図ることができるようになる。
【0044】
また、実施例において、密閉容器12の内面とバッフル板100の外縁との間に形成される半径方向の間隔S/2を1.5mmとしたが、本発明は半径方向の間隔S/2を1mm以下とした場合に最も効果を発揮する。
【0045】
尚、本実施例においては冷媒として二酸化炭素(CO2)を用いたが、これに限ら、炭化水素(HC)、アンモニア(NH3)等の冷媒を用いても本発明は有効である。
【0046】
更に、バッフル板100は吐出消音室62のカバーを兼ねるものとしたが、これに関わらず、バッフル板100と吐出消音室62のカバーとを別のものとした場合にも、本発明は有効である。
【発明の効果】
以上詳述した如く請求項1の発明によれば、密閉容器内の圧力はバッフル板の電動要素側よりも回転圧縮機構部側が低くなる。この差圧により、密閉容器内底部に溜まるオイルはバッフル板の回転圧縮機構部側に移動し、そこに設けられた給油手段により吸入されるようになるので、回転圧縮機構部などの摺動部への給油を円滑に行うことができるようになる。
【0047】
特に、密閉容器内におけるバッフル板の回転圧縮機構部側の冷媒ガスを第2の回転圧縮要素に吸い込ませるための吸気通路と、密閉容器内におけるバッフル板の電動要素側と回転圧縮機構部側とを連通する連通管とを備え、第1の回転圧縮要素で圧縮された冷媒ガスをバッフル板の電動要素側に吐出させると共に、連通管の一端は、バッフル板100の電動要素14側における密閉容器12内の下部のオイル溜めのオイルの油面より低い位置にて開口し、他端はバッフル板の回転圧縮要素側におけるオイル溜めのオイルの油面より高い位置にて開口しているので、オイルと冷媒ガスとを分離するための特別なオイル分離装置を設けることなく、オイルと冷媒ガスとを分離することができるようになると共に、バッフル板の電動要素側に吐出された冷媒ガスを連通管で回転圧縮機構部側に戻してから吸気通路により第2の回転圧縮要素に吸い込ませることで、冷媒ガスと当該冷媒ガス中に混入するオイルとがより一層分離できるようになるものである。
【0048】
更に、連通管によりコンプレッサが電動要素側に低く傾斜した場合にも連通管から確実にオイルと冷媒ガスを回転圧縮機構部側に供給することができようになるため、車載に好適となる。
【0049】
請求項2の発明によれば、請求項1の効果に加えて、連通管の長さを最小限に抑えることができ、これによりコストの削減を図ることができるようになる。
【0050】
請求項3の発明によれば、上記発明に加えて第1の回転圧縮要素で圧縮されてバッフル板の電動要素側に吐出された冷媒ガスとオイルとは、専ら連通管を通ってバッフル板の回転圧縮機構部側に供給され、確実にオイルを分離することができるようになる。
【0051】
特に、コンプレッサが電動要素側に低く傾斜した場合にも、回転圧縮機構部側のオイルが密閉容器とバッフル板との間に形成された間隔から電動要素側に流入してしまうことも殆ど無く、電動要素側のオイルが回転圧縮機構部側に戻り易くなるように構成されているため、給油手段から回転圧縮機構部の摺動部にオイルを充分に供給できるようになるものである。
【図面の簡単な説明】
【図1】本発明の実施例の横型多段圧縮式ロータリコンプレッサの縦断側面図である。
【図2】図1のロータリコンプレッサの平断面図である。
【符号の説明】
10 横型多段圧縮式ロータリコンプレッサ
12 密閉容器
32 第1の回転圧縮要素
34 第2の回転圧縮要素
38、40 シリンダ
54、56 支持部材
58、60 吸込通路
62、64 吐出消音室
100 バッフル板
101 オイルポンプ
101A オイル吸上パイプ
102 吸気通路
104 吸気口
130 連通管
135 一端の開口部
136 他端の開口部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a horizontal multistage compression rotary compressor that sucks refrigerant gas compressed by a first rotary compression element and discharged into a sealed container into a second rotary compression element, and compresses and discharges the refrigerant gas.
[0002]
[Prior art]
A multi-stage compression rotary compressor using carbon dioxide (CO 2) as a refrigerant and having a rotary compression mechanism unit composed of a first rotary compression element and a second rotary compression element, particularly an internal intermediate pressure type multi-stage compression rotary compressor, Usually, the electric element is arranged in the upper part of the vertical sealed container, and the rotary compression mechanism part driven by the rotating shaft of the electric element is arranged in the lower part. Then, the CO2 refrigerant gas is sucked into the low pressure chamber side of the cylinder from the suction port of the first rotary compression element, and is compressed by the operation of the roller and the vane to become an intermediate pressure. And then discharged into the sealed container.
[0003]
The intermediate-pressure refrigerant gas in the sealed container is sucked into the low-pressure chamber side of the cylinder from the suction port of the second rotary compression element, and the second-stage compression is performed by the operation of the roller and the vane, and the high-temperature and high-pressure refrigerant gas. Thus, it is configured to flow from the high pressure chamber side to the radiator outside the compressor through the discharge port and the discharge silencer chamber.
[0004]
Further, in such a vertical rotary compressor, the bottom of the hermetic container located below the rotary compression mechanism is an oil reservoir, and oil is supplied from the oil reservoir by an oil pump as an oil supply means configured at the lower end of the rotary shaft. It is sucked and supplied to the rotary compression mechanism part to prevent wear of the rotary compression mechanism part and the sliding part of the rotary shaft.
[0005]
[Problems to be solved by the invention]
By the way, when such a multistage compression rotary compressor is used as a horizontal type, the oil discharged into the hermetic container together with the refrigerant gas compressed by the first rotary compression element is not only the rotary compression mechanism section side but also the electric It also collects at the bottom of the sealed container on the element side. Therefore, there arises a problem that oil cannot be smoothly sucked by the oil pump configured at the end of the rotary shaft on the side of the rotary compression mechanism.
[0006]
In addition, since the refrigerant gas sucked into the second rotary compression element in the second stage is in the hermetic container, the refrigerant gas sucked into the second rotary compression element and the oil must be separated well if the second gas is not well separated. A large amount of oil is discharged from the rotary compression element to the outside, causing a shortage of oil in the sealed container.
[0007]
The present invention has been made to solve the technical problem, and when using a so-called internal intermediate pressure type multistage compression rotary compressor as a horizontal type, the oil can be smoothly supplied to the sliding portion. The purpose is to.
[0008]
[Means for Solving the Problems]
    That is, the invention of claim 1 comprises an electric element and a rotary compression mechanism portion comprising first and second rotary compression elements driven by the electric element in a horizontal sealed container, and the first rotation. A horizontal multi-stage compression rotary compressor that discharges refrigerant gas compressed by a compression element into the sealed container, and further compresses the discharged intermediate-pressure refrigerant gas by the second rotary compression element. An oil sump for storing oil sealed in the sealed container, and for forming a differential pressure by partitioning the sealed container into an electric element side and a rotary compression mechanism part side. A baffle plate, an oil supply means provided on the rotary compression mechanism portion side of the baffle plate, for supplying oil sealed in the sealed container to the rotary compression mechanism portion, and the rotary compression of the baffle plate in the sealed vessel Refrigerant gas on the mechanism side An intake passage for sucking into the second rotary compression element; and a communication pipe that communicates the electric element side of the baffle plate and the rotary compression mechanism portion side in the sealed container, and is compressed by the first rotary compression element. Discharged refrigerant gas to the electric element side of the baffle plateIn addition, one end of the communication pipe opens at a position lower than the oil level of the oil in the oil reservoir in the lower part in the closed container on the electric element side of the baffle plate, and the other end of the rotary compression element of the baffle plate It is opened at a position higher than the oil level of the oil reservoir in the side.
[0009]
    According to a second aspect of the present invention, the first rotary compression element includes an electric element and a rotary compression mechanism portion including first and second rotary compression elements driven by the electric element in a horizontal sealed container. A horizontal type multi-stage compression rotary compressor that discharges the refrigerant gas compressed in step 2 into the sealed container and further compresses the discharged intermediate-pressure refrigerant gas by the second rotary compression element. An oil sump for storing oil sealed in the sealed container, and the sealed container is divided into the electric element side and the rotary compression mechanism part side to constitute a differential pressure. A baffle plate, an oil supply means for supplying oil sealed in the sealed container to the rotary compression mechanism unit, and the baffle in the sealed container. Said rotation of the plate An intake passage for sucking refrigerant gas on the contraction mechanism portion side into the second rotary compression element, and a communication pipe communicating the electric element side of the baffle plate and the rotary compression mechanism portion side in the sealed container; The refrigerant gas compressed by the first rotary compression element is discharged to the electric element side of the baffle plate, and
    One end of the communication pipe opens at a position lower than the oil level of the oil in the oil reservoir in the lower part of the sealed container on the electric element side of the baffle plate, and the other end extends from the bottom surface of the sealed container to the baffle plate. Position higher than 10% of the height dimension ofAt a position higher than the oil level of the oil reservoir.The baffle plate is open to the rotary compression element side.
[0010]
    In invention of Claim 3,DenseThe interval between the closed container and the baffle plate was set to 5% or less with respect to the inner diameter of the sealed container.Is.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of an internal intermediate pressure type horizontal multi-stage (two-stage) compression rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of a horizontal multi-stage compression rotary compressor of the present invention. FIG. 2 and FIG. 2 show plan sectional views of the rotary compressor 10 of FIG.
[0012]
In each figure, the rotary compressor 10 of the embodiment is an internal intermediate pressure type horizontal multistage compression rotary compressor using carbon dioxide (CO2) as a refrigerant. The rotary compressor 10 includes a horizontally long cylindrical sealed container 12 sealed at both ends. And the bottom of the sealed container 12 is used as an oil reservoir. The sealed container 12 houses a rotary compression mechanism portion 18 including an electric element 14 and a first rotary compression element 32 and a second rotary compression element 34 driven by the rotary shaft 16 of the electric element 14. .
[0013]
A circular attachment hole 12D is formed at the end of the sealed container 12 on the electric element 14 side, and a terminal 20 for supplying electric power to the electric element 14 is attached to the attachment hole 12D.
[0014]
The electric element 14 includes a stator 22 that is annularly attached along the inner peripheral surface of the hermetic container 12 and a rotor 24 that is inserted and installed inside the stator 22 with a slight gap. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the axial direction of the sealed container 12.
[0015]
An oil pump 101 as an oil supply means is formed at the end of the rotary shaft 16 on the rotary compression mechanism 18 side. The oil pump 101 is provided to suck up oil as lubricating oil from an oil reservoir formed at the bottom of the sealed container 12 and supply it to the sliding portion of the rotary compression mechanism 18 to prevent wear. The oil suction pipe 101A descends from the oil pump 101 toward the bottom of the hermetic container 12, and is opened by an oil reservoir.
[0016]
The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. The rotor 24 is also formed of a laminated body 30 of electromagnetic steel sheets, like the stator 22, and is formed by inserting a permanent magnet MG into the laminated body 30.
[0017]
The first rotary compression element 32 and the second rotary compression element 34 are constituted by first and second cylinders 38 and 40, and an intermediate partition plate 36 is sandwiched between the cylinders 38 and 40. That is, the rotary compression mechanism unit 18 includes a first rotary compression element 32, a second rotary compression element 34, and an intermediate partition plate 36. Further, the first and second rotary compression elements 32 and 34 are different from the first and second cylinders 38 and 40 disposed on both sides (left and right in FIG. 1) of the intermediate partition plate 36 by 180 degrees. The first and second rollers 46 are fitted into first and second eccentric portions 42 and 44 provided on the rotary shaft 16 and rotate eccentrically in the first and second cylinders 38 and 40. , 48, first and second vanes 50, 52 that abut against the rollers 46, 48, respectively, and divide the inside of the cylinders 38, 40 into a low pressure chamber side and a high pressure chamber side, respectively, and the electric element 14 of the cylinder 38 The side opening surface and the opening surface on the side opposite to the electric element 14 of the cylinder 40 are respectively closed, and support members 54 and 56 that also serve as bearings for the rotating shaft 16 are configured.
[0018]
On the outer side (lower side in FIG. 1) of the vanes 50 and 52, springs 74 and 76 that abut against the outer ends of the vanes 50 and 52 and constantly bias the vanes 50 and 52 toward the rollers 46 and 48 are provided. It has been. Furthermore, metal plugs 122 and 123 are provided on the closed container 12 side of the springs 74 and 76, and serve to prevent the springs 74 and 76 from coming off. Further, a back pressure chamber (not shown) is formed in the first vane 50, and the pressure on the high pressure chamber side in the cylinder 38 is applied as a back pressure to the back pressure chamber.
[0019]
In addition, the support members 54 and 56 have suction passages 58 and 60 that respectively communicate with the low pressure chambers inside the cylinders 38 and 40 through the suction ports 161 and 162, and a part of the suction passages 58 and 60, respectively. Discharge silencer chambers 62 and 64 formed by closing the plate 100 and the cover 68 are provided. That is, the discharge silencer chamber 62 is formed by closing the recessed portion of the support member 54 with the baffle plate 100, and the discharge silencer chamber 64 is formed by closing the recessed portion of the support member 56 with the cover 68.
[0020]
The discharge silencer chamber 64 and the sealed container 12 are communicated with each other through a communication path (not shown) that passes through the cylinders 38 and 40, the intermediate partition plate 36, and the baffle plate 100 and opens to the electric element 14 side. An intermediate discharge pipe 121 is erected in the section, and an intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 is discharged from the intermediate discharge pipe 121 to the electric element 14 side in the sealed container 12. At this time, the oil supplied to the first rotary compression element 32 is mixed in the refrigerant gas, but this oil is also discharged to the electric element 14 side in the sealed container 12. Here, the oil mixed in the refrigerant gas is separated from the refrigerant gas and collected in an oil reservoir at the bottom of the sealed container 12.
[0021]
The baffle plate 100 described above is provided to divide the inside of the sealed container 12 into the electric element 14 side and the rotary compression mechanism unit 18 side, and to form a differential pressure in the sealed container 12. The baffle plate 100 is made of a donut-shaped steel plate, and is provided with a predetermined distance S from the sealed container 12. This interval S is expressed by S = D1−D2 where the inner diameter of the sealed container 12 is D1 and the outer diameter of the baffle plate 100 is D2, and the interval S is 5% or less (( S / D1) × 100 is set to 5% or less). Therefore, the space S / 2 between the inner surface of the sealed container 12 and the outer edge of the baffle plate 100, that is, the radial distance S / 2 is 2.5% or less with respect to the inner diameter D1 of the sealed container 12.
[0022]
In the present embodiment, the radial distance S / 2 is 2 mm or less. Specifically, the inner diameter D1 of the sealed container 12 is 109 mm, and the outer diameter D2 of the baffle plate 100 is 106 mm. As a result, the radial interval S / 2 is 1.5 mm (the interval S is 2.8% with respect to the inner diameter D1 of the hermetic container 12, and the radial interval S / 2 is smaller than the inner diameter D1 of the hermetic container 12). 1.38%).
[0023]
Thus, the baffle plate is obtained by setting the interval S to 5% or less with respect to the inner diameter D1 of the sealed container 12 (the radial interval S / 2 is 2.5% or less to the inner diameter D1 of the sealed container 12). Through 100, a desired differential pressure can be formed between the electric element 14 side and the rotary compression mechanism 18 side.
[0024]
Here, a part of the intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 and discharged to the electric element 14 side in the sealed container 12 was formed between the sealed container 12 and the baffle plate 100. Although it flows into the rotary compression mechanism part 18 side through the space | interval S, the pressure by the side of the electric element 14 of the baffle plate 100 is high in the airtight container 12 by the presence of the baffle plate 100, and the rotary compression mechanism part. A low differential pressure is configured on the 18th side. Further, since the baffle plate 100 also serves as a cover for the discharge silencer chamber 62 formed by recessing a part of the support member 54 as described above, the structure is simplified by reducing the number of parts, the cost is reduced, and the dimensions are reduced. The size can be reduced.
[0025]
    In the sealed container 12, a communication pipe 130 is provided for communicating the electric element 14 side and the rotary compression mechanism portion 18 side. The communication pipe 130 is provided to supply oil and refrigerant gas on the electric element 14 side to the rotary compression mechanism unit 18 side.An opening 135 at one end opens at a position lower than the oil level of the oil in the lower oil reservoir in the closed container 12 on the electric element 14 side of the baffle plate 100.The electric element 14 extends in the axial direction on the baffle plate 100 side and rises toward the upper portion of the sealed container 12, and then passes through the baffle plate 100 to the rotary compression mechanism 18 side of the baffle plate 100. An opening 136 at the other end is opened and is formed to communicate with the rotary compression mechanism 18 side.
[0026]
Here, the opening 136 at the other end of the communication pipe 130 provided on the baffle plate 100 on the rotary compression mechanism portion 18 side is provided at a position of 40% of the height of the baffle plate 100 at the bottom of the sealed container 12. Yes. Since this is a position higher than the oil level of the oil in the bottom of the oil reservoir in the sealed container 12, the refrigerant gas and oil flowing into the rotary compression mechanism 18 from the opening 136 at the other end are the oil in the oil sump. Can be avoided beforehand, and the refrigerant gas and the oil can be separated without providing a special oil separation mechanism for separating the refrigerant gas and the oil.
[0027]
Then, the oil stored in the oil reservoir at the bottom of the inside of the sealed container 12 due to the above-described differential pressure flows into the rotary compression mechanism portion 18 side through the communication pipe 130, and the oil level on the rotary compression mechanism portion 18 side from the baffle plate 100. Rises. Accordingly, the opening of the oil suction pump 101A is immersed in the oil without any trouble, so that the oil is smoothly supplied to the sliding portion of the rotary compression mechanism portion 18 by the oil pump 101.
[0028]
Further, the baffle plate 100 is provided with an intake passage 102 that communicates with the suction passage 58 described above in order to introduce the intermediate-pressure refrigerant gas in the hermetic container 12 into the second rotary compression element 34. An intake port 104 of the intake passage 102 is opened at an upper portion of the baffle plate 100 on the rotary compression mechanism portion 18 side, and intermediate pressure refrigerant gas is sucked from the intake port 104. The intake passage 102 is configured to pass through the baffle plate 100 and pass through the baffle plate 100 after the piping passes through the electric element 14 side of the baffle plate 100 to communicate with the suction passage 58.
[0029]
The portions other than the attachment location of the intake passage 102 are provided apart from the baffle plate 100. As a result, the intake passage 102 is less likely to be heated by the heat of the rotary compression mechanism 18, and the refrigerant gas that passes through the intake passage 102 and is introduced into the second rotary compression element 34 is also less likely to be heated. The compression efficiency of the second rotary compression element 34 can be improved. In addition, the intake passage 102 does not interfere with the rotary compression mechanism 18, and the arrangement of components in the sealed container 12 is facilitated. Since the intake port 104 of the intake passage 102 is opened at the upper part on the side of the rotary compression mechanism portion 18 on the opposite side of the baffle plate 100 from the electric element 14 side where the intermediate discharge pipe 121 is opened, the intake passage Oil separation of the refrigerant gas sucked into 102 is performed smoothly.
[0030]
Furthermore, since the interval S between the sealed container 12 and the baffle plate 100 is 5% or less with respect to the inner diameter D1 of the sealed container 12 as described above, the electric element of the baffle plate 100 is compressed by the first rotary compression element 32. The refrigerant gas and oil discharged to the 14 side are supplied exclusively to the rotary compression mechanism 18 side of the baffle plate 100 through the communication pipe 130, so that the refrigerant gas and oil can be reliably separated. It will be.
[0031]
In this case, as the refrigerant, the carbon dioxide (CO2), which is a natural refrigerant in consideration of flammability and toxicity, is used as the refrigerant, and the oil as the lubricating oil sealed in the sealed container 12 is used. For example, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, and PAG (polyalkyl glycol) are used.
[0032]
Sleeves 142 and 143 are welded and fixed to the side surfaces of the sealed container 12 at positions corresponding to the side portions of the support members 56 and 54, respectively. One end of a refrigerant introduction pipe 94 for introducing the refrigerant into the cylinder 40 is inserted into the sleeve 142 and communicated with the suction passage 60. In addition, a refrigerant discharge pipe 96 is inserted into the sleeve 143, and one end of the refrigerant introduction pipe 96 communicates with the discharge silencer chamber 62. Further, a mounting base 110 is provided at the bottom of the sealed container 12 (not shown in FIG. 2).
[0033]
Next, the operation of the rotary compressor 10 with the above configuration will be described. When the electric element 14 is also energized to the stator coil 28 via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the rollers 46 and 48 are eccentrically rotated in the cylinders 38 and 40 by being fitted to the eccentric portions 42 and 44 provided integrally with the rotary shaft 16.
[0034]
As a result, the low-pressure refrigerant gas is sucked into the low-pressure chamber side of the cylinder 40 of the first rotary compression element 32 from the suction port 162 via the refrigerant introduction pipe 94 and the suction passage 60 formed in the support member 56. The intermediate pressure is compressed by the operation of 48 and the vane 52, and is discharged from the high pressure chamber side of the cylinder 40 through the communication passage (not shown) from the intermediate discharge pipe 121 to the electric element 14 side in the sealed container 12. At this time, the oil supplied to the first rotary compression element 32 is mixed in the intermediate-pressure refrigerant gas discharged to the electric element 14 side in the sealed container 12, and this oil is separated and sealed. It accumulates in the oil sump at the bottom of the container 12. Then, a part of the refrigerant gas flows into the rotary compression mechanism 18 side from a slight space S formed between the baffle plate 100 and the sealed container 12.
[0035]
Here, the refrigerant gas passes through the space S formed between the baffle plate 100 and the sealed container 12, so that the pressure in the sealed container 12 is rotated from the electric element 14 side as described above. The side is lower.
[0036]
As a result, the refrigerant gas and the oil flow into the communication pipe 130 from the opening 135 at one end of the communication pipe 130 formed at the lower portion of the electric element 14 in the sealed container 12 by this differential pressure, and easily at the other end. Supplied from the opening 136 to the rotary compression mechanism 18 side.
[0037]
Since the opening 136 at the other end of the communication pipe 130 opens at a position higher than the oil level of the oil stored in the oil reservoir provided at the bottom of the sealed container 12, the oil in the oil reservoir foams. Without being done, the refrigerant gas and the oil are separated, and the oil returns to the oil reservoir on the rotary compression mechanism portion 18 side formed at the bottom of the sealed container 12.
[0038]
On the other hand, the intermediate-pressure refrigerant gas that has flowed into the rotary compression mechanism portion 18 side flows into the intake passage 102 from the intake port 104. The refrigerant gas flowing into the intake passage 102 passes through the inside and flows into the suction passage 58 and is sucked into the low pressure chamber side of the cylinder 38 of the second rotary compression element 34 from the suction port 161. The suctioned intermediate-pressure refrigerant gas is compressed at the second stage by the rotation of the roller 46 and the vane 50 to become a high-temperature / high-pressure refrigerant gas, which is formed on the support member 54 from the high-pressure chamber side through a discharge port (not shown). The discharge silencer chamber 62 and the refrigerant discharge pipe 96 flow into the external radiator.
[0039]
As described above, by providing the baffle plate 100 that is divided into the electric element 14 side and the rotary compression mechanism portion 18 side to form the differential pressure, the oil accumulated in the inner bottom portion of the sealed container 12 is rotationally compressed by the baffle plate 100. Since it moves to the mechanism portion 18 side and is sucked by the oil pump 101 provided there, it is possible to smoothly supply oil to the sliding portion such as the rotary compression mechanism portion 18.
[0040]
    In particular, the intake passage 102 for sucking the refrigerant gas on the rotary compression mechanism portion 18 side of the baffle plate 100 in the sealed container 12 into the second rotary compression element 34, and the electric element 14 of the baffle plate 100 in the sealed container 12. And a communication pipe 130 that communicates the rotary compression mechanism portion 18 side with each other, discharges the refrigerant gas compressed by the first rotary compression element 32 to the electric element 14 side of the baffle plate 100, and One endThe baffle plate 100 is opened at a position lower than the oil level of the oil in the lower oil reservoir in the sealed container 12 on the electric element 14 side.Since the other end is opened at a position higher than the oil level of the oil in the oil reservoir on the rotary compression mechanism portion 18 side of the baffle plate 100, a special oil separation mechanism for separating the oil and the refrigerant gas is provided. The refrigerant gas can be separated from the oil gas and the refrigerant gas without being discharged, and the refrigerant gas discharged to the electric element 14 side of the baffle plate 100 is returned to the rotary compression mechanism portion 18 side through the communication pipe 130 before the intake passage. By sucking the second rotary compression element 34 by 102, the refrigerant gas and the oil mixed in the refrigerant gas can be further separated.
[0041]
    Furthermore, when the compressor 10 is inclined low toward the electric element 14 sideThe baffle plate 100 is opened at a position lower than the oil level of the oil in the lower oil reservoir in the sealed container 12 on the electric element 14 side.Since the oil and the refrigerant gas can be reliably supplied to the rotary compression mechanism 18 side from one end of the communication pipe 130 that is provided, it is suitable for in-vehicle use.
[0042]
Further, since the interval S between the sealed container 12 and the baffle plate 100 is set to 5% or less with respect to the inner diameter D1 of the sealed container 12, it is compressed by the first rotary compression element 32 and moved to the electric element 14 side of the baffle plate 100. The discharged refrigerant gas and oil are supplied exclusively to the rotary compression mechanism 18 side of the baffle plate 100 through the communication pipe 130, so that the oil can be reliably separated.
[0043]
In the embodiment, the opening 136 at the other end of the communication pipe 130 is provided at a position of 40% of the height dimension of the baffle plate 100 on the bottom surface of the hermetic container 12. The position of the opening 136 at the other end of 130 is determined as appropriate. In this embodiment, since the oil level of the oil is less than 10% of the height dimension of the baffle plate 100, if the opening 136 is provided at a position of 10% of the height dimension of the baffle plate 100, oil separation is performed. Is possible. In this case, the length of the communication pipe 130 can be minimized, thereby reducing the cost.
[0044]
In the embodiment, the radial distance S / 2 formed between the inner surface of the sealed container 12 and the outer edge of the baffle plate 100 is set to 1.5 mm. However, in the present invention, the radial distance S / 2 is set to 1.5 mm. The most effective when it is 1 mm or less.
[0045]
  In the present embodiment, carbon dioxide (CO2) is used as the refrigerant, but the present invention is not limited to this.ZThe present invention is effective even when a refrigerant such as hydrocarbon (HC) or ammonia (NH 3) is used.
[0046]
Further, although the baffle plate 100 also serves as the cover of the discharge silencer chamber 62, the present invention is effective even when the baffle plate 100 and the cover of the discharge silencer chamber 62 are different from each other. is there.
【The invention's effect】
As described above in detail, according to the first aspect of the invention, the pressure in the sealed container is lower on the rotary compression mechanism portion side than on the electric element side of the baffle plate. Due to this differential pressure, the oil accumulated at the bottom of the sealed container moves to the rotary compression mechanism part side of the baffle plate and is sucked by the oil supply means provided there, so that the sliding part such as the rotary compression mechanism part etc. It will be possible to smoothly refuel.
[0047]
    In particular, an intake passage for sucking refrigerant gas on the rotary compression mechanism portion side of the baffle plate in the sealed container into the second rotary compression element, an electric element side and a rotary compression mechanism portion side of the baffle plate in the sealed container, And a discharge pipe that discharges the refrigerant gas compressed by the first rotary compression element to the electric element side of the baffle plate, and one end of the communication pipe isThe baffle plate 100 is opened at a position lower than the oil level of the oil in the lower oil reservoir in the sealed container 12 on the electric element 14 side.Since the other end is opened at a position higher than the oil level of the oil in the oil reservoir on the rotary compression element side of the baffle plate, without providing a special oil separation device for separating the oil and the refrigerant gas, The oil and the refrigerant gas can be separated, and the refrigerant gas discharged to the electric element side of the baffle plate is returned to the rotary compression mechanism portion side through the communication pipe, and then the second rotary compression element by the intake passage. By sucking into the refrigerant gas, the refrigerant gas and the oil mixed in the refrigerant gas can be further separated.
[0048]
Furthermore, oil and refrigerant gas can be reliably supplied from the communication pipe to the rotary compression mechanism section side even when the compressor is inclined low toward the electric element side by the communication pipe.
[0049]
According to the second aspect of the invention, in addition to the effect of the first aspect, the length of the communication pipe can be minimized, thereby reducing the cost.
[0050]
According to the invention of claim 3, in addition to the above-described invention, the refrigerant gas and the oil compressed by the first rotary compression element and discharged to the electric element side of the baffle plate exclusively pass through the communication pipe and the baffle plate. The oil is supplied to the rotary compression mechanism and can be reliably separated.
[0051]
In particular, even when the compressor is inclined low toward the electric element side, the oil on the rotary compression mechanism portion side hardly flows into the electric element side from the interval formed between the sealed container and the baffle plate, Since the oil on the electric element side is configured to easily return to the rotary compression mechanism portion side, the oil can be sufficiently supplied from the oil supply means to the sliding portion of the rotary compression mechanism portion.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a horizontal multi-stage compression rotary compressor according to an embodiment of the present invention.
2 is a cross-sectional plan view of the rotary compressor of FIG. 1. FIG.
[Explanation of symbols]
10 Horizontal multistage compression rotary compressor
12 Sealed container
32 First rotary compression element
34 Second rotational compression element
38, 40 cylinders
54, 56 Support member
58, 60 Suction passage
62, 64 Discharge silencer
100 baffle plate
101 Oil pump
101A Oil suction pipe
102 Intake passage
104 Inlet
130 communication pipe
135 Opening at one end
136 Opening at the other end

Claims (3)

横型の密閉容器内に電動要素と、該電動要素にて駆動される第1及び第2の回転圧縮要素から成る回転圧縮機構部とを備え、前記第1の回転圧縮要素で圧縮された冷媒ガスを前記密閉容器内に吐出し、更にこの吐出された中間圧の冷媒ガスを前記第2の回転圧縮要素で圧縮する横型多段圧縮式ロータリコンプレッサであって、
前記密閉容器内の底部に設けられ、該密閉容器内に封入されたオイルを貯留するためのオイル溜めと、
前記密閉容器内を前記電動要素側と回転圧縮機構部側とに区画して差圧を構成するためのバッフル板と、
該バッフル板の前記回転圧縮機構部側に設けられ、前記密閉容器内に封入されたオイルを前記回転圧縮機構部に供給するための給油手段と、
前記密閉容器内における前記バッフル板の前記回転圧縮機構部側の冷媒ガスを前記第2の回転圧縮要素に吸い込ませるための吸気通路と、
前記密閉容器内における前記バッフル板の前記電動要素側と回転圧縮機構部側とを連通する連通管とを備え、
前記第1の回転圧縮要素で圧縮された冷媒ガスを前記バッフル板の前記電動要素側に吐出させると共に、
前記連通管の一端は、前記バッフル板の前記電動要素側における前記密閉容器内下部の前記オイル溜めのオイルの油面より低い位置にて開口し、他端は前記バッフル板の前記回転圧縮要素側における前記オイル溜めのオイルの油面より高い位置にて開口していることを特徴とする横型多段圧縮式ロータリコンプレッサ。
Refrigerant gas compressed by the first rotary compression element, comprising an electric element and a rotary compression mechanism portion composed of first and second rotary compression elements driven by the electric element in a horizontal sealed container A horizontal multi-stage compression rotary compressor that compresses the discharged intermediate-pressure refrigerant gas by the second rotary compression element,
An oil reservoir provided at the bottom of the sealed container, for storing oil sealed in the sealed container;
A baffle plate for partitioning the inside of the sealed container into the electric element side and the rotary compression mechanism part side to constitute a differential pressure;
Oil supply means provided on the rotary compression mechanism portion side of the baffle plate and for supplying oil sealed in the sealed container to the rotary compression mechanism portion;
An intake passage for sucking refrigerant gas on the rotary compression mechanism portion side of the baffle plate in the sealed container into the second rotary compression element;
A communication pipe communicating the electric element side of the baffle plate and the rotary compression mechanism part side in the sealed container;
The refrigerant gas compressed by the first rotary compression element is discharged to the electric element side of the baffle plate, and
One end of the communication pipe opens at a position lower than the oil level of the oil in the oil reservoir in the lower part of the sealed container on the electric element side of the baffle plate, and the other end is on the rotary compression element side of the baffle plate. The horizontal multistage compression rotary compressor is opened at a position higher than the oil level of the oil in the oil reservoir.
横型の密閉容器内に電動要素と、該電動要素にて駆動される第1及び第2の回転圧縮要素から成る回転圧縮機構部とを備え、前記第1の回転圧縮要素で圧縮された冷媒ガスを前記密閉容器内に吐出し、更にこの吐出された中間圧の冷媒ガスを前記第2の回転圧縮要素で圧縮する横型多段圧縮式ロータリコンプレッサであって、
前記密閉容器内の底部に設けられ、該密閉容器内に封入されたオイルを貯留するためのオイル溜めと、
前記密閉容器内を前記電動要素側と回転圧縮機構部側とに区画して差圧を構成するためのバッフル板と、
該バッフル板の前記回転圧縮機構部側に設けられ、前記密閉容器内に封入されたオイルを前記回転圧縮機構部に供給するための給油手段と、
前記密閉容器内における前記バッフル板の前記回転圧縮機構部側の冷媒ガスを前記第2の回転圧縮要素に吸い込ませるための吸気通路と、
前記密閉容器内における前記バッフル板の前記電動要素側と回転圧縮機構部側とを連通する連通管とを備え、
前記第1の回転圧縮要素で圧縮された冷媒ガスを前記バッフル板の前記電動要素側に吐出させると共に、
前記連通管の一端は、前記バッフル板の前記電動要素側における前記密閉容器内下部の前記オイル溜めのオイルの油面より低い位置にて開口し、他端は前記密閉容器の底面から前記バッフル板の高さ寸法の10%より高い位置で、前記オイル溜めのオイルの油面より高い位置の当該バッフル板の前記回転圧縮要素側に開口していることを特徴とする横型多段圧縮式ロータリコンプレッサ。
Refrigerant gas compressed by the first rotary compression element, comprising an electric element and a rotary compression mechanism portion composed of first and second rotary compression elements driven by the electric element in a horizontal sealed container A horizontal multi-stage compression rotary compressor that compresses the discharged intermediate-pressure refrigerant gas by the second rotary compression element,
An oil reservoir provided at the bottom of the sealed container, for storing oil sealed in the sealed container;
A baffle plate for partitioning the inside of the sealed container into the electric element side and the rotary compression mechanism part side to constitute a differential pressure;
Oil supply means provided on the rotary compression mechanism portion side of the baffle plate and for supplying oil sealed in the sealed container to the rotary compression mechanism portion;
An intake passage for sucking refrigerant gas on the rotary compression mechanism portion side of the baffle plate in the sealed container into the second rotary compression element;
A communication pipe communicating the electric element side of the baffle plate and the rotary compression mechanism part side in the sealed container;
The refrigerant gas compressed by the first rotary compression element is discharged to the electric element side of the baffle plate, and
One end of the communication pipe opens at a position lower than the oil level of the oil in the oil reservoir in the lower part of the sealed container on the electric element side of the baffle plate, and the other end extends from the bottom surface of the sealed container to the baffle plate. A horizontal multi-stage compression rotary compressor, wherein the baffle plate is opened to the rotary compression element side at a position higher than 10% of the height dimension of the oil reservoir and higher than the oil level of the oil in the oil reservoir .
前記密閉容器と前記バッフル板との間隔を密閉容器の内径に対して5%以下としたことを特徴とする請求項1又は請求項2の横型多段圧縮式ロータリコンプレッサ。  The horizontal multistage compression rotary compressor according to claim 1 or 2, wherein a distance between the sealed container and the baffle plate is 5% or less with respect to an inner diameter of the sealed container.
JP2002090282A 2002-03-28 2002-03-28 Horizontal multistage compression rotary compressor Expired - Fee Related JP4063568B2 (en)

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CN100412379C (en) * 2003-12-12 2008-08-20 乐金电子(天津)电器有限公司 Oil separating device in rotating type compressor

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