JP3823190B2

JP3823190B2 - Sealed helium scroll compressor

Info

Publication number: JP3823190B2
Application number: JP2001156374A
Authority: JP
Inventors: 正夫椎林; 勝章矢野; 康伊豆永
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2001-05-25
Filing date: 2001-05-25
Publication date: 2006-09-20
Anticipated expiration: 2021-05-25
Also published as: JP2002349461A

Description

【０００１】
【発明の属する技術分野】
本発明は、冷凍サイクルに用いる密閉形ヘリウム用スクロール圧縮機に係り、作動ガスとしてヘリウムガスを用いている超高真空分野のクライオポンプ装置用ヘリウム圧縮機等に好適な密閉形ヘリウム用スクロール圧縮機に関するものである。
【０００２】
【従来の技術】
従来の密閉形ヘリウム用スクロール圧縮機で、その密閉容器内を高圧状態に保っている、いわゆる高圧チャンバ方式を採用し、潤滑油による冷却、いわゆる油注入方式すなわち油インジェクション方式を採用しているものにおいて、例えば特開昭６１−１１２７９４号公報に開示されているように、密閉容器底部に溜めた潤滑油を一旦容器外に導き油冷却器を介して再度スクロール圧縮機の圧縮機部へ注入するようにした構成のものがある。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来技術のものは、ヘリウム圧縮機ユニットのサイクル配管の構成如何によっては次のような問題が生じる場合がある。図１１は、従来技術の底チャンバ構造を示す。図１１に示すように、油出口部３０の油吸込み管部３０ａの上方部にはヘリウムガスが溜まりやすくなるという現象の起きる場合がある。これは、従来技術の油板４６の外周部に均等に十数個設けた矩形状の通路４６ｃによって、電動機ステータ３ａの外縁部のステータス外周通路２５ｂを鉛直方向に通ったヘリウムガスが上記複数の通路４６ｃをくぐり、油板４６の下側にいたり、そこで溜まるという弊害によるものであることが実験的にわかった。しかも、図１１に示すように、底チャンバの油溜めの油面がガス流の風圧によって押し下げられることがわかった。
【０００４】
このため、上記した油出口部３０の油吸込み管部３０ａの吸込み口から潤滑油２４中にヘリウムガスが混入することになるというものである。その結果、インジェクション配管にガスが間欠的に混入するため、異状振動とともに耳障りな異常音が発生し、圧縮機ユニットとしても騒音レベルが高くなるという問題が、油インジェクション量が大量の場合において発生する場合がある。
【０００５】
また、従来例の図９、図１０に示した油板４６の場合、空調用スクロール圧縮機の場合には適正な構造であるが、インジェクション油量が大量に通過する密閉形ヘリウムスクロール圧縮機の場合には、通路４６ａ，４６ｂ，４６ｃの全体の通路面積が小さく油板４６上面に油が溜まり、結果的に上記ガス溜り現象と密閉容器自体の油上がり現象を助長することになる。
【０００６】
本発明の目的は、上記のような従来技術の問題点を解決して、密閉形ヘリウム用スクロール圧縮機において、インジェクション配管の異状振動を防止し、騒音低減を図り、スクロール圧縮機の信頼性向上と品質向上ができる注油式の密閉形ヘリウム用スクロール圧縮機を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、本発明による密閉形ヘリウム用スクロール圧縮機は、特許請求の範囲の各請求項に記載されたところを特徴とするものであるが、特に独立項としての請求項１に係る発明による密閉形ヘリウム用スクロール圧縮機は、密閉容器の内部に、固定スクロール、旋回スクロール及びフレームを組合せてなる圧縮機部と、該圧縮機部を駆動するためのステータ及びロータからなる電動機部とを収納配設し、前記圧縮機部に作動ヘリウムガスを冷却するための油注入機構を備え、前記圧縮機部のフレーム外側に、圧縮ヘリウムガスが吐出される密閉容器内上部空間とヘリウムガスの吐出管を取付けた電動機上側の密閉容器内中部空間とを連通するフレーム外周通路を備えると共に、前記電動機部のステータ外側に、前記密閉容器内中部空間と電動機下側の密閉容器内下部空間とを連通し、１本は前記フレーム外周通路に対面する複数本のステータ外周通路を備え、一方密閉容器底部には油溜めを被う油板を設け、該油溜めに各軸受部に潤滑油を供給する回転軸に連設する油吸上管を有し、底キャップの胴体部に、前記油溜めに浸漬され、油吸込み管部と外部配管との接続口となる油継ぎ手部とを一体とした潤滑油を吐出する油出口部を設けた密閉形ヘリウム用スクロール圧縮機において、前記油板は、前記油溜めの油面に前記ヘリウムガスの流れを至らせないように機能する半周部に設けた無孔の衝突板機能部と、該半周部とは反対側の半周部に設けた充分な排油機能をもった有孔の排出油通路機能部とを有し、前記油板には補強リブ構造となるように環状の凹凸部を備え、更に前記油出口部の上方に向いた前記油吸込み管部の油吸込み口が、圧縮機が約１０度前後鉛直軸方向に対して傾斜しても、前記油吸上管の最下端部の位置より、上方の位置にあることを特徴とするものである。同じく、独立項としての請求項２に係る発明による密閉形ヘリウム用スクロール圧縮機は、請求項１に記載の構成上の特徴に加えて、前記油板の排出油通路機能部の全排出油通路面積を、前記ステータ外周通路の全面積の２倍以上に設定したことを特徴とするものである。
【０００８】
【発明の実施の形態】
以下、本発明の実施例を図１ないし図８によって詳細に説明する。
【０００９】
図１は、本発明による注油式の密閉形ヘリウム用スクロール圧縮機の縦断面図及び注油系統図を示している。図２は、図１のＣ−Ｃ断面図である。図１と図２を基に本実施例を説明する。
【００１０】
図１において、密閉容器２内の上方にはスクロール圧縮機部が、下方には電動機部３が、収納されている。そして、密閉容器２内は、フレーム１１によって密閉容器内上部空間である吐出室１ａと密閉容器内中部空間である電動機室１ｂとに区画されている。
【００１１】
スクロール圧縮機部は、固定スクロール５と旋回スクロール６を互いに噛み合せて密閉空間である圧縮室８を形成している。固定スクロール５は、円板状の鏡板５ａと、これに直立しインボリウト曲線あるいはこれに近似の曲線に形成されたラップ５ｂとからなり、その外周部に吸入口１４、中心部に吐出口１０を備えている。
【００１２】
図１に示すように、作動ガスがヘリウムガスであり、該作動ヘリウムガスを冷却するための油インジェクション管３１を、密閉容器２に貫通して固定スクロール５の鏡板部５ａに設けた油注入用ポート２２に接続し、該油注入用ポート２２の開口部は、旋回スクロール６のラップ６ｂの歯先面に対向して開口せしめている。
【００１３】
旋回スクロール６は、円板状の鏡板６ａと、これに直立し、固定スクロールのラップと同一形状に形成されたラップ６ｂと、鏡板の反ラップ面に形成されたボス部６ｃとからなっている。フレーム１１は、中央部に軸受部２６，２７を形成し、これらの軸受部２６，２７に回転軸１５が支承され、回転軸１５先端の偏心軸１５ａは、上記ボス部６ｃに旋回運動が可能なように挿入されている。
【００１４】
また、フレーム１１には、固定スクロール５が、複数本のボルトによって固定され、旋回スクロール６は、オルダムリング及びオルダムキーよりなるオルダム機構１２によってフレーム１１に支承され、旋回スクロール６は、固定スクロール５に対して、自転しないで旋回運動をするように構成されている。
【００１５】
回転軸１５には、下部に電動機軸１５ｂを一体に連設し、電動機部３を直結している。固定スクロール５の吸入口１４には、密閉容器２を貫通して垂直方向の吸入管１７が接続され、吐出口１０が開口している吐出室１ａは、フレーム外周通路１８ａ，１８ｂを介して電動機室１ｂと連通している。この電動機室１ｂには、密閉容器２を貫通する吐出管２０を設けている。また、電動機室１ｂの上部と下部とは、電動機ステータ３ａと密閉容器２の側壁２ｂとの間の複数個のステータ外周通路２５及び電動機ステータ３ａと電動機ロータ３ｂとの隙間を介して連通している。
【００１６】
なお、９ａと９ｂは、旋回スクロール６の旋回運動に伴い生じる遠心力を相殺するためのバランスウエイト及び副ウエイトである。また、吸入管１７と固定スクロール５との間には、高圧部と低圧部とをシールするＯリング２１を設けている。
【００１７】
また、図１に示したように、旋回スクロール６の鏡板の背面には、スクロール圧縮機部とフレーム１１で囲まれた空間２３（以下、背圧室と呼ぶ）が形成され、この背圧室２３には、旋回スクロールの鏡板に穿設した細孔６ｄを介し、吸入圧力と吐出圧力の中間の圧力が導入され、旋回スクロール６を固定スクロール５に押付ける軸方向の付与力を与えている。
【００１８】
潤滑油２４は、密閉容器２の底部の油溜めに溜められており、この潤滑油２４は、密閉容器２内の高圧圧力と、上記背圧室２３の中間圧力との差圧により油吸上管１３へ吸上げられた後、回転軸１５内の中央穴５０を上昇し、旋回軸受３２へ、また横穴５１を介して補助軸受２６から円筒コロ軸受部からなる主軸受２７へ給油される。各軸受部２６，２７，３２へ給油された油は、前記背圧室２３を経てスクロールラップの圧縮室８へ注入され圧縮ガスと混合され、次いで吐出ガスと共に吐出室１ａへ吐出される。なお、４０は、前記潤滑油２４の油面上に配設された油板を示す。
【００１９】
前記密閉容器２の底部には、該底部の潤滑油２４を器外へ取出す油出口部３０が設けられている。底キャップの胴体部に、油吸込み管部３０ａと外部配管との接続口となる油継ぎ手部３０ｂを一体とした油出口部３０を設け、電動機下方に密閉容器内下部空間である電動機下方の空間１ｃにおけるガスの流れを至らせないように機能する半周部に設けた無孔の衝突板機能部４０ｂと、電動機室下方の空間１ｃ内に流動するインジェクション油を底チャンバ油溜めに戻す該半周部とは反対側の半周部に設けた充分な排油機能をもった有孔の排出油通路機能部４０ａ，４０ｃ，４０ｄの両者機能を有する油板４０を、備えている。図１の場合、左半周部が衝突板機能部４０ｂであり、右半周部に排出油通路機能部４０ａ，４０ｃ，４０ｄを有している。
【００２０】
また、密閉容器２の上部には、スクロール圧縮機部の圧縮途中の圧縮室８へ油を注入する油インジェクション管３１が設けられている。この油インジェクション管３１は、固定スクロール５の鏡板５ａに穿設した油注入用ポート２２を介して圧縮室８にそれぞれ連通している。
【００２１】
前記油出口部３０と前記油インジェクション管３１とは、油冷却器３３を介設して油配管３６ａ及び絞り部６０を介して接続されている。
【００２２】
上記構成により、電動機ロータ３ｂに直結した電動機軸１５ｂが回転して偏心軸１５ａが、偏心回転すると、旋回軸受３２を介して旋回スクロール６は旋回運動を行う。この旋回運動により、圧縮室８は、次第に中心に移動して容積が減少する。
【００２３】
作動ガスは、吸入管１７から吸入口１４を経て吸入室５ｆへ入ると共に、軸受２６，２７，３２を潤滑した潤滑油２４が、旋回スクロール６の旋回スクロール鏡板外周部のフレーム室１１ｆから微少隙間等を介して吸入室５ｆへ流入して前記作動ガスに混入する。軸受２６，２７，３２を経由した潤滑油２４と前記した油注入用ポート２２から注入された潤滑油２４とを含んだ作動ガスは、前記圧縮室８で圧縮されて吐出口１０から吐出室１ａへ吐出され、フレーム外周通路１８ａ，１８ｂを通って電動機室１ｂへ流入する。なお、実線の矢印は、作動ガスであるヘリウムガスの流れを、破線の矢印は、潤滑油２４の流れをそれぞれ示している。
【００２４】
ヘリウムガスと潤滑油２４は、狭いフレーム外周通路１８ａ，１８ｂから広い空間の電動機室１ｂに流入し、その主流は、電動機ステータ３ａの外縁部のステータ外周通路２５ｂを鉛直方向に通り、本発明の油板４１に至る。一方、電動機ステータ３ａ上面に衝突した混合流は、流れ方向が変更し、その過程で、ガス中に含まれる油の一部分が分離され、作動ガスは、吐出管２０内へ流出する。
【００２５】
一方潤滑油２４は、電動機ロータ外周部の隙間を通って流下し、密閉容器２底部に留まる。密閉容器２の底部に溜められた潤滑油２４は、油面が水平に保持されヘリウムガスを混入することなく密閉容器２内の吐出圧力と前記油注入用ポート２２と係る圧縮室８の圧力との差圧によって油出口部３０の油吸込み管部３０ａから該油出口部３０内に流入していく。油出口部３０内へ流入した潤滑油２４は、油インジェクション管３６を通って油冷却器３３へ至り、ここで適宜冷却された後、油配管３６ａ、油インジェクション管３６ｂ、３１及び油注入用ポート２２を経て圧縮室８へ注入される。
【００２６】
圧縮室８へ注入された潤滑油２４は、該圧縮室８内において作動ガスの冷却作用及びスクロールラップ先端部等の摺動部を潤滑する役目を果す。そして、この潤滑油２４は、作動ガスと共に圧縮された後、吐出口１０より吐出室１ａへ吐出され、前述と同様に電動機室１ｂで作動ガスから分離して密閉容器２の底部に溜まる。なお、各軸受２６，２７，３２への給油は、密閉容器２内の圧力と背圧室２３内の中間圧力との差圧により、油吸上管１３、回転軸１５内の給油通路を介して行われる。
【００２７】
図３ないし図６を用いて本発明の作用を説明する。図３において、油板４１の端部Ｓ点が、図２においてフレーム外周通路１８ａ，１８ｂの中央端部Ｒ点に一致するように組み立てるものである。また、油板４１の端部Ｓ点が図６においてステータ外周通路２５ｂの中央端部Ｑ点に一致するように組み立てるものである。
【００２８】
図５において、狭いフレーム外周通路１８ａ，１８ｂから広い空間の電動機室１ｂに流入した潤滑油２４とガスの主流は、電動機ステータ３ａの外縁部のステータ外周通路２５ｂを鉛直方向に通り、本発明の油板４１に至る。そこで、ヘリウムガス流は、まず電動機下方の空間１ｃにおけるガスの流れに伴う油面の攪拌作用を防止する衝突板機能部４１ｂに衝突して水平方向に方向変換する。このとき、ガス中の潤滑油２４は分離される。
【００２９】
次に、該潤滑油２４の電動機室下方の空間１ｃ内に流動するインジェクション油を底チャンバ油溜めに戻す排出油通路機能部４１ａ，４１ｃ，４１ｄの大小の穴部にて下方に落下する。なお、油板４１には、薄板１ｍｍ前後を金型によるプレス成形加工にて製作するため、剛性を増加させるため環状の補強リブ４１ｐ部（図４参照）の構造を備えている。図３に示すように、半周部に上記衝突板機能部４１ｂを、反対の半周部に上記排出油通路機能部４１ａ，４１ｃ，４１ｄを備えているものであり、両者機能を分離して機能させていることが特徴である。
【００３０】
このため、図５に示すように、油板４１の上側には油が溜まる現象がなくなり、従来例のそこで油が溜まるという弊害が解消される。仮に、油面が低下して油板４１近くの油板４１下方にあったとしても、油面が水平で均一に保持されるので、上記した油出口部３０の油吸込み管部３０ａの流入口から潤滑油２４中にヘリウムガスが混入することがなくなるというものである。
【００３１】
図５において、底キャップ２ｃの胴体部２ｕにおいて、油吸込み管部３０ａと油インジェクション管３６との接続口となる油継ぎ手部３０ｂを一体とした油出口部３０を設け、該油吸込み管部３０ａが図５のように上方に向き、油吸込み口が、旋回軸受部３２、フレーム１１下端部の補助軸受部２６への給油のための回転軸１５の下端に設けた油吸上管１３の最下端部の位置より、上方の位置にある。
【００３２】
なお、図１、図５の実施例は、油出口部３０の上方に向いた油吸込み管部３０ａの油吸込み口が、回転軸１５が約１０度前後鉛直軸に対して傾斜しても、前記回転軸１５の下端に設けた油吸上管１３の最下端部の位置より、上方の位置にあることを特徴とした実施例で、軸受部への給油切れが未然に防止できる効果がある。
【００３３】
図６は、図１のＤ−Ｄ断面図である。図６において、電動機部３下端部と油出口部３０との間に、油板４１を圧縮機の密閉容器２の内壁面に設けている。図６は、電動機ステータ３ａの外周部に設けたステータ外周通路２５ｂの位置と該油板４１の位置関係をしめしている。なお、ステータ外周通路２５ａ，２５ｃ，２５ｄは、主に上方向に流れるヘリウムガスの通路となる。
【００３４】
インジェクション油量が、大量に通過するヘリウム圧縮機の場合には、空調用の場合の通路４６ａ，４６ｂ，４６ｃの全体の通路面積より２倍〜２．５倍の通路面積を確保するものである。ヘリウム用圧縮機の場合、冷媒フロン２２のようにヘリウムガスが潤滑油２４に溶け込むことがないため、潤滑油２４が冷媒により希釈されることがなく油粘度が数倍高くなる。このため、油板４６の上に溜まった潤滑油２４ａ（図１１参照）を底チャンバ部に戻すには通路抵抗を大きく減らすため、通路面積を大きく確保する必要がある。具体的には、油板４１の排出油通路面積を次の比率に設定することが実用的である。
【００３５】

なお、空調用の場合の通路４６ａ，４６ｂ，４６ｃの全体の通路面積比は、Ｚｓ＝０．０７〜０．１以下である。
【００３６】
また、従来例の図１１に示すような油板４６の上に溜まった潤滑油２４ａを底チャンバ部に戻すための通路抵抗を大きく減らすため、電動機下端部と油出口部３０との間に、油板４０，４１を圧縮機のケーシング２ｂの内壁面に設け、該油板４０，４１の排出用油通路面積Ｂｓを電動機ステータ３ａの外周部に設けたステータ外周通路２５の全面積の２倍以上に設定していることも特徴である。
【００３７】
図７と図８は、油板４２の他の実施例である。両図に示すように、ほぼ半周部のみに上記衝突板機能部を備えた油板構造である。上記した排出油通路機能部は、板構造を切除しており、ガス流による油面攪拌作用の弊害はより小さく押さえられる。本構造においても、本発明の作用・効果が得られる。
【００３８】
【発明の効果】
本発明によれば、次の作用効果がある。
（１）油出口部の油吸込み管部の流入口から潤滑油中にヘリウムガスが混入することがなくなり、インジェクション配管の異状振動がなくなり、ひいては配管亀裂などの事故を未然に防止できる。
（２）耳障りな異常騒音がなくなり、圧縮機ユニット全体としての騒音低減が図られ、製品の品質向上が図れる。
（３）底チャンバの油面が常時水平に保たれるので、軸受部への給油切れ現象が解消され、圧縮機の信頼性が向上できる。
（４）インジェクション油量が大量に通過するヘリウム圧縮機の場合には油板の通路面積が十分確保され、密閉容器自体の油上がり低減効果が得られる。
（５）油板は補強リブ構造となるように環状の凹凸部を備えるものとしたので、油板の剛性を高め、組立性の向上が図られる。
（６）油出口部の上方に向いた油吸込み管部の油吸込み口が、圧縮機が約１０度前後鉛直軸方向に対して傾斜しても、前記油吸上管の最下端部の位置より、上方の位置にあるので、軸受部への給油切れが未然に防止できる。
【００３９】
以上のことから、ヘリウム用スクロール圧縮機の信頼性向上と品質向上が達成される注油式の密閉形ヘリウムスクロール圧縮機を提供することができるものである。
【図面の簡単な説明】
【図１】本発明の注油式の密閉形ヘリウムスクロール圧縮機の実施例を示す縦断面図、及び注油系統図である。
【図２】図１のＣ- Ｃ断面図である。
【図３】油板の実施例を示す平面図である。
【図４】油板の実施例の縦断面図である。
【図５】図１の油出口部及び油板周辺部を拡大した部分縦断面図である。
【図６】図１のＤ- Ｄ断面図で、油板と電動機ステータとの位置関係を示す。
【図７】油板の他の実施例を示す平面図である。
【図８】油板の他の実施例の縦断面図である。
【図９】従来技術の油板構造を示す平面図である。
【図１０】従来技術の油板構造を示す縦断面図である。
【図１１】従来技術の油板構造による底チャンバの油面が傾斜した状態における油出口部周辺部を拡大した部分縦断面図である。
【符号の説明】
１ａ…吐出室
１ｂ…電動機室
１ｃ…電動機下方の空間
２…密閉容器
２ｂ…側壁
２ｃ…底キャップ
２ｕ…胴体部
３…電動機部
３ａ…電動機ステータ
３ｂ…電動機ロータ
５…固定スクロール
５a …鏡板
５ｂ…ラップ
５ｆ…吸入室
６…旋回スクロール
６ａ…鏡板
６ｂ…ラップ
６ｃ…ボス部
６ｄ…細孔
８…圧縮室
９ａ…バランスウェイト
９ｂ…副ウェイト
１０…吐出口
１１…フレーム
１１ｆ…フレーム室
１２…オルダム機構
１３…油吸上管
１４…吸入口
１５…回転軸
１５ａ…偏心軸
１５ｂ…電動機軸
１７…吸入管
１８ａ，１８ｂ…フレーム外周通路
２０…吐出管
２１…Ｏリング
２２…油注入用ポート
２３…背圧室
２４，２４ａ…潤滑油
２５，２５ａ，２５ｂ，２５ｃ，２５ｄ…ステータ外周通路
２６…補助軸受
２７…主軸受
３０…油出口部
３０ａ…油吸込み管部
３０ｂ…油継ぎ手部
３１…油インジェクション管
３２…旋回軸受
３３…油冷却器
３６，３６ｂ…油インジェクション管
３６ａ…油配管
４０，４１，４２，４６…油板
４０ａ，４０ｃ，４０ｄ…排出油通路機能部
４０ｂ…衝突板機能部
４１ａ，４１ｃ，４１ｄ…排出油通路機能部
４１ｂ…衝突板機能部
４１ｐ…補強リブ
４６ａ，４６ｂ，４６ｃ…通路
５０…中央穴
５１…横穴
６０…絞り部[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed helium scroll compressor used in a refrigeration cycle, and is suitable for a helium compressor for a cryopump apparatus in an ultra-high vacuum field using helium gas as a working gas. It is about.
[0002]
[Prior art]
This is a conventional sealed helium scroll compressor that uses a so-called high-pressure chamber system that keeps the inside of the sealed container at a high pressure, and uses cooling by lubricating oil, a so-called oil injection system, that is, an oil injection system. In Japanese Patent Application Laid-Open No. 61-112794, for example, the lubricating oil accumulated in the bottom of the sealed container is once guided out of the container and again injected into the compressor section of the scroll compressor through the oil cooler. There is a thing of the structure made like this.
[0003]
[Problems to be solved by the invention]
However, the above prior art may cause the following problems depending on the configuration of the cycle piping of the helium compressor unit. FIG. 11 shows a prior art bottom chamber structure. As shown in FIG. 11, there may be a phenomenon in which helium gas tends to accumulate in the upper part of the oil suction pipe part 30 a of the oil outlet part 30. This is because helium gas vertically passing through the status outer peripheral passage 25b of the outer edge portion of the motor stator 3a by the dozen rectangular passages 46c provided uniformly on the outer peripheral portion of the oil plate 46 of the prior art. It has been experimentally found that this is due to an adverse effect of passing through the passage 46c and being under the oil plate 46 and collecting there. Moreover, as shown in FIG. 11, it was found that the oil level of the oil sump in the bottom chamber was pushed down by the wind pressure of the gas flow.
[0004]
For this reason, helium gas is mixed into the lubricating oil 24 from the suction port of the oil suction pipe portion 30a of the oil outlet portion 30 described above. As a result, the gas is intermittently mixed into the injection piping, so that abnormal noise is generated along with abnormal vibration, and the problem that the noise level of the compressor unit becomes high occurs when the amount of oil injection is large. There is a case.
[0005]
In the case of the oil plate 46 shown in FIGS. 9 and 10 of the conventional example, the structure is appropriate in the case of the scroll compressor for air conditioning, but the sealed helium scroll compressor through which a large amount of injection oil passes is used. In this case, the entire passage area of the

passages

46a, 46b, and 46c is small, and oil accumulates on the upper surface of the oil plate 46. As a result, the gas accumulation phenomenon and the oil rising phenomenon of the sealed container itself are promoted.
[0006]
The object of the present invention is to solve the above-mentioned problems of the prior art, and in a sealed helium scroll compressor, to prevent abnormal vibration of the injection piping, to reduce noise, and to improve the reliability of the scroll compressor. The object is to provide an oil-filled hermetic scroll compressor for helium that can improve quality.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the scroll compressor for sealed helium according to the present invention is characterized by what is described in each claim, and particularly in claim 1 as an independent claim. A hermetically sealed scroll compressor for helium according to the invention includes a compressor unit formed by combining a fixed scroll, an orbiting scroll, and a frame inside a sealed container, and an electric motor unit including a stator and a rotor for driving the compressor unit. And an oil injecting mechanism for cooling the working helium gas in the compressor section, and the upper space inside the sealed container in which the compressed helium gas is discharged and the helium gas outside the frame of the compressor section A frame outer peripheral passage that communicates with the middle space in the hermetically sealed container on the upper side of the motor to which the discharge pipe is attached, and on the outer side of the stator of the motor portion, An oil plate which communicates the inner and middle spaces with the lower space in the sealed container below the motor, and includes one stator outer peripheral passage facing the outer peripheral passage of the frame, while the bottom of the closed container is covered with an oil sump. The oil sump has an oil suction pipe connected to a rotating shaft that supplies lubricating oil to each bearing part. The body part of the bottom cap is immersed in the oil sump and has an oil suction pipe part and an external part. In a sealed helium scroll compressor provided with an oil outlet that discharges lubricating oil integrated with an oil joint serving as a connection port with a pipe, the oil plate is placed on the oil surface of the oil sump with the helium gas. Perforated discharge oil with a non-perforated collision plate function provided in the half-periphery that functions to prevent the flow of water and a sufficient oil discharge function provided in the half-periphery opposite to the half-periphery and a passage function unit, irregularity of the annular so that the reinforcing rib structure on the oil plate Provided, be further inclined oil inlet of the oil suction pipe part facing the upper side of the oil outlet section, compressor relative to about 10 degrees before and after the vertical axis direction, the lowermost end of the oil suction pipe It is characterized by being in a position above the position . Similarly, in the sealed helium scroll compressor according to the invention according to claim 2 as an independent claim, in addition to the structural features according to claim 1, the entire discharged oil passage of the discharged oil passage function portion of the oil plate is provided. The area is set to be twice or more of the total area of the stator outer peripheral passage.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
[0009]
FIG. 1 shows a longitudinal sectional view and a lubrication system diagram of an oil-filled sealed helium scroll compressor according to the present invention. 2 is a cross-sectional view taken along the line CC of FIG. A present Example is demonstrated based on FIG. 1 and FIG.
[0010]
In FIG. 1, the scroll compressor part is accommodated in the upper part in the airtight container 2, and the electric motor part 3 is accommodated in the lower part. The inside of the sealed container 2 is partitioned by a frame 11 into a discharge chamber 1a that is an upper space in the sealed container and an electric motor chamber 1b that is a middle space in the sealed container.
[0011]
The scroll compressor unit forms a compression chamber 8 which is a sealed space by meshing the fixed scroll 5 and the orbiting scroll 6 with each other. The fixed scroll 5 is composed of a disc-shaped end plate 5a and a wrap 5b which stands upright and has an involute curve or a curve approximate thereto, and has a suction port 14 at the outer peripheral portion and a discharge port 10 at the central portion. I have.
[0012]
As shown in FIG. 1, the working gas is helium gas, and an oil injection pipe 31 for cooling the working helium gas passes through the hermetic container 2 and is provided in the end plate portion 5 a of the fixed scroll 5. Connected to the port 22, the opening of the oil injection port 22 is opened facing the tooth tip surface of the wrap 6 b of the orbiting scroll 6.
[0013]
The orbiting scroll 6 is composed of a disc-shaped end plate 6a, a wrap 6b that stands upright and is formed in the same shape as the fixed scroll wrap, and a boss portion 6c formed on the anti-wrap surface of the end plate. . The frame 11 has bearing

portions

26 and 27 at the center, and the rotating shaft 15 is supported by these bearing

portions

26 and 27, and the eccentric shaft 15a at the tip of the rotating shaft 15 is capable of swiveling with the boss portion 6c. Has been inserted.
[0014]
A fixed scroll 5 is fixed to the frame 11 by a plurality of bolts. The orbiting scroll 6 is supported on the frame 11 by an Oldham mechanism 12 including an Oldham ring and Oldham key. The orbiting scroll 6 is fixed to the fixed scroll 5. On the other hand, it is comprised so that it may turn without rotating.
[0015]
An electric motor shaft 15b is integrally connected to the lower portion of the rotating shaft 15, and the electric motor unit 3 is directly connected thereto. The suction port 14 of the fixed scroll 5 is connected to a vertical suction pipe 17 passing through the hermetic container 2, and the discharge chamber 1 a in which the discharge port 10 is opened is connected to the electric motor via the frame outer

peripheral passages

18 a and 18 b. It communicates with the chamber 1b. The electric motor chamber 1 b is provided with a discharge pipe 20 that penetrates the sealed container 2. The upper and lower portions of the motor chamber 1b communicate with each other through a plurality of stator outer peripheral passages 25 between the motor stator 3a and the side wall 2b of the hermetic container 2 and gaps between the motor stator 3a and the motor rotor 3b. Yes.
[0016]
In addition, 9a and 9b are balance weights and subweights for canceling out centrifugal force generated with the orbiting motion of the orbiting scroll 6. An O-ring 21 is provided between the suction pipe 17 and the fixed scroll 5 to seal the high pressure part and the low pressure part.
[0017]
Further, as shown in FIG. 1, a space 23 (hereinafter referred to as a back pressure chamber) surrounded by the scroll compressor portion and the frame 11 is formed on the back surface of the end plate of the orbiting scroll 6, and this back pressure chamber is formed. 23, an intermediate pressure between the suction pressure and the discharge pressure is introduced through a fine hole 6 d formed in the end plate of the orbiting scroll, and an axial force for pressing the orbiting scroll 6 against the fixed scroll 5 is given. .
[0018]
The lubricating oil 24 is stored in an oil sump at the bottom of the sealed container 2, and this lubricating oil 24 absorbs oil by a differential pressure between the high pressure in the sealed container 2 and the intermediate pressure in the back pressure chamber 23. After being sucked up by the pipe 13, the central hole 50 in the rotary shaft 15 is raised and supplied to the rotary bearing 32 and from the auxiliary bearing 26 to the main bearing 27 including the cylindrical roller bearing portion via the lateral hole 51. The oil supplied to the

bearings

26, 27, 32 is injected into the compression chamber 8 of the scroll wrap through the back pressure chamber 23, mixed with the compressed gas, and then discharged into the discharge chamber 1a together with the discharge gas. Reference numeral 40 denotes an oil plate disposed on the oil surface of the lubricating oil 24.
[0019]
An oil outlet 30 is provided at the bottom of the sealed container 2 to take out the lubricating oil 24 from the bottom. The bottom part of the body of the bottom cap is provided with an oil outlet part 30 integrated with an oil joint part 30b that serves as a connection port between the oil suction pipe part 30a and the external pipe. A non-perforated collision plate function part 40b provided in a half-peripheral part functioning so as not to bring the gas flow in 1c, and the half-periphery part for returning the injection oil flowing in the space 1c below the motor chamber to the bottom chamber oil sump An oil plate 40 having both functions of perforated drain oil passage function portions 40a, 40c, and 40d having a sufficient oil drain function provided in a half-circumferential portion on the opposite side of the cylinder is provided. In the case of FIG. 1, the left half periphery is the collision plate function part 40b, and the right half periphery has the discharge oil passage function parts 40a, 40c, and 40d.
[0020]
Further, an oil injection pipe 31 for injecting oil into the compression chamber 8 in the middle of compression of the scroll compressor unit is provided at the upper part of the hermetic container 2. The oil injection pipe 31 communicates with the compression chamber 8 via an oil injection port 22 formed in the end plate 5 a of the fixed scroll 5.
[0021]
The oil outlet part 30 and the oil injection pipe 31 are connected via an oil pipe 36 a and a throttle part 60 via an oil cooler 33.
[0022]
With the above configuration, when the motor shaft 15b directly connected to the motor rotor 3b rotates and the eccentric shaft 15a rotates eccentrically, the orbiting scroll 6 performs the orbiting motion via the orbiting bearing 32. By this turning motion, the compression chamber 8 gradually moves to the center and the volume decreases.
[0023]
The working gas enters the suction chamber 5 f from the suction pipe 17 through the suction port 14, and the lubricating oil 24 that lubricates the

bearings

26, 27, and 32 is slightly separated from the frame chamber 11 f on the outer periphery of the orbiting scroll end plate of the orbiting scroll 6. Or the like and flows into the suction chamber 5f to be mixed into the working gas. The working gas containing the lubricating oil 24 that has passed through the

bearings

26, 27, and 32 and the lubricating oil 24 injected from the oil injection port 22 is compressed in the compression chamber 8 and discharged from the discharge port 10 to the discharge chamber 1a. And flows into the motor chamber 1b through the frame outer

peripheral passages

18a and 18b. The solid line arrows indicate the flow of the helium gas that is the working gas, and the broken line arrows indicate the flow of the lubricating oil 24.
[0024]
The helium gas and the lubricating oil 24 flow into the motor chamber 1b in a wide space from the narrow frame outer

peripheral passages

18a and 18b, and the main flow passes through the stator outer peripheral passage 25b at the outer edge portion of the motor stator 3a in the vertical direction. The oil plate 41 is reached. On the other hand, the mixed flow that has collided with the upper surface of the motor stator 3 a changes the flow direction, and in the process, part of the oil contained in the gas is separated, and the working gas flows out into the discharge pipe 20.
[0025]
On the other hand, the lubricating oil 24 flows down through the gap in the outer periphery of the motor rotor and stays at the bottom of the sealed container 2. The lubricating oil 24 stored at the bottom of the hermetic container 2 has the oil level held horizontally, and the discharge pressure in the hermetic container 2 and the pressure in the compression chamber 8 associated with the oil injection port 22 without mixing helium gas. The differential pressure of the oil flows from the oil suction pipe portion 30a of the oil outlet portion 30 into the oil outlet portion 30. The lubricating oil 24 that has flowed into the oil outlet 30 passes through the oil injection pipe 36 to the oil cooler 33, where it is appropriately cooled, and then the oil pipe 36a, the

oil injection pipes

36b and 31, and the oil injection port. It is injected into the compression chamber 8 through 22.
[0026]
The lubricating oil 24 injected into the compression chamber 8 serves to cool the working gas in the compression chamber 8 and lubricate sliding portions such as the scroll wrap tip. The lubricating oil 24 is compressed together with the working gas, and then is discharged from the discharge port 10 to the discharge chamber 1a. In the same manner as described above, the lubricating oil 24 is separated from the working gas in the electric motor chamber 1b and collected at the bottom of the sealed container 2. The

bearings

26, 27, and 32 are supplied with oil through the oil suction pipe 13 and the oil supply passage in the rotary shaft 15 due to the differential pressure between the pressure in the sealed container 2 and the intermediate pressure in the back pressure chamber 23. Done.
[0027]
The operation of the present invention will be described with reference to FIGS. 3, the end S point of the oil plate 41 is assembled so as to coincide with the central end R point of the frame outer

peripheral passages

18a, 18b in FIG. Further, the oil plate 41 is assembled so that the end S point of the oil plate 41 coincides with the central end Q point of the stator outer peripheral passage 25b in FIG.
[0028]
In FIG. 5, the main flow of the lubricating oil 24 and gas flowing into the motor chamber 1b in a wide space from the narrow frame outer

peripheral passages

18a and 18b passes through the stator outer peripheral passage 25b at the outer edge portion of the motor stator 3a in the vertical direction. The oil plate 41 is reached. Therefore, the helium gas flow first collides with the collision plate function part 41b that prevents the oil surface agitating action accompanying the gas flow in the space 1c below the electric motor and changes its direction in the horizontal direction. At this time, the lubricating oil 24 in the gas is separated.
[0029]
Next, the injection oil flowing into the space 1c below the motor chamber of the lubricating oil 24 falls down in the large and small holes of the discharged oil

passage function portions

41a, 41c, 41d that return the bottom chamber oil sump. The oil plate 41 is provided with a structure of an annular reinforcing rib 41p (see FIG. 4) in order to increase rigidity because a thin plate of about 1 mm is manufactured by press molding using a mold. As shown in FIG. 3, the collision plate function part 41b is provided in the half circumference part, and the drain oil

passage function parts

41a, 41c, 41d are provided in the opposite half circumference part. It is a feature.
[0030]
For this reason, as shown in FIG. 5, the phenomenon that the oil is accumulated on the upper side of the oil plate 41 is eliminated, and the adverse effect that the oil is accumulated in the conventional example is solved. Even if the oil level is lowered and is below the oil plate 41 near the oil plate 41, the oil level is held horizontally and uniformly, so the inlet of the oil suction pipe part 30a of the oil outlet part 30 described above Therefore, the helium gas is not mixed in the lubricating oil 24.
[0031]
In FIG. 5, an oil outlet portion 30 is provided in the body portion 2u of the bottom cap 2c so that an oil joint portion 30b serving as a connection port between the oil suction tube portion 30a and the oil injection tube 36 is integrated, and the oil suction tube portion 30a. As shown in FIG. 5, the oil suction port is located at the bottom of the oil suction pipe 13 provided at the lower end of the rotary shaft 15 for supplying oil to the auxiliary bearing portion 26 at the lower end portion of the swing bearing portion 32 and the frame 11. It is in a position above the position of the lower end.
[0032]
1 and FIG. 5, the oil suction port of the oil suction pipe part 30 a facing upward from the oil outlet part 30 may be inclined even if the rotary shaft 15 is inclined about 10 degrees around the vertical axis. In an embodiment characterized by being located above the position of the lowermost end of the oil suction pipe 13 provided at the lower end of the rotary shaft 15, there is an effect that it is possible to prevent the oil supply to the bearing portion from being lost. .
[0033]
6 is a cross-sectional view taken along the line DD of FIG. In FIG. 6, an oil plate 41 is provided on the inner wall surface of the hermetic container 2 of the compressor between the lower end of the electric motor unit 3 and the oil outlet 30. FIG. 6 shows the positional relationship between the position of the stator outer peripheral passage 25b provided in the outer peripheral portion of the electric motor stator 3a and the oil plate 41. The stator outer

peripheral passages

25a, 25c, and 25d are helium gas passages that mainly flow upward.
[0034]
In the case of a helium compressor through which a large amount of injection oil passes, a passage area that is twice to 2.5 times the entire passage area of the

passages

46a, 46b, 46c in the case of air conditioning is ensured. . In the case of a compressor for helium, helium gas does not dissolve in the lubricating oil 24 unlike the refrigerant Freon 22, so that the lubricating oil 24 is not diluted with the refrigerant and the oil viscosity is increased several times. For this reason, to return the lubricating oil 24a (see FIG. 11) accumulated on the oil plate 46 to the bottom chamber portion, it is necessary to secure a large passage area in order to greatly reduce the passage resistance. Specifically, it is practical to set the discharged oil passage area of the oil plate 41 to the following ratio.
[0035]

Note that the overall passage area ratio of the

passages

46a, 46b, and 46c in the case of air conditioning is Zs = 0.07 to 0.1 or less.
[0036]
Further, in order to greatly reduce the passage resistance for returning the lubricating oil 24a accumulated on the oil plate 46 as shown in FIG. 11 of the conventional example to the bottom chamber portion, between the lower end portion of the motor and the oil outlet portion 30,

Oil plates

40 and 41 are provided on the inner wall surface of the casing 2b of the compressor, and the oil passage area Bs for discharging the

oil plates

40 and 41 is twice the total area of the stator outer peripheral passage 25 provided on the outer peripheral portion of the motor stator 3a. It is also a feature that it is set as described above.
[0037]
7 and 8 show another embodiment of the oil plate 42. FIG. As shown in both drawings, the oil plate structure is provided with the collision plate function portion only in a substantially half circumference portion. The above-described drain oil passage function portion has a plate structure cut away, and the adverse effect of the oil level agitating action due to the gas flow can be suppressed to a smaller extent. Also in this structure, the operation and effect of the present invention can be obtained.
[0038]
【The invention's effect】
The present invention has the following effects.
(1) Helium gas is not mixed into the lubricating oil from the inlet of the oil suction pipe section at the oil outlet section, abnormal vibration of the injection pipe is eliminated, and accidents such as pipe cracks can be prevented.
(2) Annoying abnormal noise is eliminated, the noise of the entire compressor unit is reduced, and product quality can be improved.
(3) Since the oil level of the bottom chamber is always kept horizontal, the lack of oil supply to the bearing is eliminated, and the reliability of the compressor can be improved.
(4) In the case of a helium compressor through which a large amount of injection oil passes, the passage area of the oil plate is sufficiently secured, and the effect of reducing the oil rise of the sealed container itself can be obtained.
(5) Since the oil plate is provided with an annular concavo-convex portion so as to have a reinforcing rib structure, the rigidity of the oil plate is increased and the assemblability is improved.
(6) The position of the lowermost end portion of the oil suction pipe even when the oil suction port of the oil suction pipe portion facing upward of the oil outlet portion is inclined with respect to the vertical axis direction about 10 degrees. Furthermore, since it is in the upper position, it is possible to prevent the bearing portion from being completely refueled.
[0039]
From the above, it is possible to provide an oil-filled hermetic helium scroll compressor in which the reliability and quality of the helium scroll compressor are improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of an oil-filled hermetic scroll compressor of the present invention, and an oil-filling system diagram.
FIG. 2 is a cross-sectional view taken along the line CC of FIG.
FIG. 3 is a plan view showing an embodiment of an oil plate.
FIG. 4 is a longitudinal sectional view of an embodiment of an oil plate.
5 is an enlarged partial vertical sectional view of an oil outlet portion and an oil plate peripheral portion in FIG. 1; FIG.
6 is a cross-sectional view taken along the line DD in FIG. 1, showing the positional relationship between the oil plate and the electric motor stator.
FIG. 7 is a plan view showing another embodiment of the oil plate.
FIG. 8 is a longitudinal sectional view of another embodiment of the oil plate.
FIG. 9 is a plan view showing a conventional oil plate structure.
FIG. 10 is a longitudinal sectional view showing a conventional oil plate structure.
FIG. 11 is an enlarged partial longitudinal sectional view of a peripheral portion of an oil outlet portion in a state where an oil level of a bottom chamber is inclined by a conventional oil plate structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a ... Discharge chamber 1b ... Motor room 1c ... Motor lower space 2 ... Sealed container 2b ... Side wall 2c ... Bottom cap 2u ... Body part 3 ... Motor part 3a ... Motor stator 3b ... Motor rotor 5 ... Fixed scroll 5a ... End plate 5b ... Wrap 5f ... Suction chamber 6 ... Orbiting scroll 6a ... End plate 6b ... Wrap 6c ... Boss portion 6d ... Fine hole 8 ... Compression chamber 9a ... Balance weight 9b ... Sub weight 10 ... Discharge port 11 ... Frame 11f ... Frame chamber 12 ... Oldham mechanism 13 ... Oil suction pipe 14 ... Suction port 15 ... Rotating shaft 15a ... Eccentric shaft 15b ... Motor shaft 17 ...

Suction pipe

18a, 18b ... Frame outer peripheral passage 20 ... Discharge pipe 21 ... O-ring 22 ... Oil injection port 23 ...

Back Pressure chambers

24, 24a ... Lubricating

oil

25, 25a, 25b, 25c, 25d ... Stator outer peripheral passage 26 ... Auxiliary bearing 27 ... Main bearing 30 ... Oil outlet 30a ... Oil Oil pipe portion 30b ... oil joint portion 31 ... oil injection tube 32 ... slewing bearing 33 ... oil cooler 36, 36b ... oil injection tube 36a ... oil piping 40, 41, 42, 46 ... oil plates 40a, 40c, 40d ... discharge Oil passage function part 40b ... Collision

plate function part

41a, 41c, 41d ... Drain oil passage function part 41b ... Collision plate function part 41p ...

Reinforcement ribs

46a, 46b, 46c ... Passage 50 ... Center hole 51 ... Side hole 60 ... Restriction part

Claims

A compressor unit formed by combining a fixed scroll, an orbiting scroll, and a frame and an electric motor unit including a stator and a rotor for driving the compressor unit are housed and disposed in the sealed container. An oil injection mechanism for cooling the working helium gas is provided, and the inside of the sealed container on the upper side of the electric motor in which the upper space inside the sealed container and the helium gas discharge pipe are installed outside the frame of the compressor unit A frame outer peripheral passage communicating with the middle space is provided, and the inner space inside the sealed container and the lower space inside the sealed container on the lower side of the motor are communicated with the outer side of the stator of the electric motor portion, and one is connected to the outer peripheral passage of the frame. A plurality of stator outer peripheral passages facing each other are provided, and an oil plate for covering an oil reservoir is provided at the bottom of the sealed container, and the oil reservoir is connected to a rotating shaft that supplies lubricating oil to each bearing portion. An oil outlet that has an oil suction pipe and discharges lubricating oil that is immersed in the oil reservoir in the body portion of the bottom cap, and that integrates an oil joint part that serves as a connection port between the oil suction pipe part and an external pipe. In a sealed helium scroll compressor provided with a section,
The oil plate is provided in a non-perforated collision plate function portion provided in a half-circular portion functioning so as not to allow the flow of the helium gas to reach the oil surface of the oil sump, and in a half-circular portion opposite to the half-circular portion. and a discharge oil passage function of perforated with sufficient oil discharge function has, on the oil plate comprises a concavo-convex portion of the annular so that the reinforcing rib structure, further improvement above the oil outlet The oil suction port of the oil suction pipe portion is located above the position of the lowermost end portion of the oil suction pipe even when the compressor is inclined about 10 degrees around the vertical axis direction. A sealed scroll compressor for helium.

A compressor unit formed by combining a fixed scroll, an orbiting scroll, and a frame and an electric motor unit including a stator and a rotor for driving the compressor unit are housed and disposed in the sealed container. An oil injection mechanism for cooling the working helium gas is provided, and the inside of the sealed container on the upper side of the electric motor in which the upper space inside the sealed container and the helium gas discharge pipe are installed outside the frame of the compressor unit A frame outer peripheral passage communicating with the middle space is provided, and the inner space inside the sealed container and the lower space inside the sealed container on the lower side of the motor are communicated with the outer side of the stator of the electric motor portion, and one is connected to the outer peripheral passage of the frame. comprising a plurality of stator outer periphery passage facing, whereas the closed container bottom is provided an oil plate covering the Me oil reservoir, Ren設Su the rotating shaft to supply the lubricating oil to the bearings in Me oil reservoir Has an oil suction pipe, the body portion of the bottom cap, is immersed in the oil reservoir Me discharges lubricating oil as a whole that the oil joint portion serving as the oil suction pipe section and an external piping connection port oil In a sealed helium scroll compressor provided with an outlet,
The oil plate, the impact plate function of the non-hole formed in half section acting so as not to bring the flow of the helium gas to the oil surface of the Me oil reservoir, the half portion on the side opposite to the semi-circumferential portion Provided with a perforated drainage oil passage function portion having a sufficient oil drainage function, and the oil plate is provided with an annular concavo-convex portion so as to form a reinforcing rib structure, and is directed above the oil outlet portion. The oil suction port of the oil suction pipe portion is located at a position higher than the position of the lowermost end portion of the oil suction pipe even when the compressor is inclined about 10 degrees around the vertical axis direction, All oil discharge passage area of the oil discharge passage function portion of the oil plate, sealed helium scroll compressor, characterized in that set to more than twice the total area of the stator outer periphery passage.

When the total drain oil passage area of the drain oil passage function part of the oil plate is Bs (cm ² ), the stroke volume of the compressor is Vth (cm ³ / rev), and Zs = Bs / Vth, Zs = 0 The scroll compressor for sealed helium according to claim 1, wherein the scroll compressor is for helium.