JP2600378B2 - Scroll compressor - Google Patents

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、空調機、冷蔵庫等の冷凍機用のスクロー
ル圧縮機に関するものである。Description: TECHNICAL FIELD The present invention relates to a scroll compressor for a refrigerator such as an air conditioner and a refrigerator.

従来の技術 スクロール圧縮機は、固定渦巻き羽根と旋回渦巻羽根
で構成する圧縮室の洩れ隙間の密封や羽根先端の密封材
の潤滑の目的で圧縮機に供給される少量の潤滑油のほか
は、各摺動部を潤滑後、密閉容器に飛散させる構造にな
っている。一般に密閉容器の内部に吸入側の冷媒気体の
圧力が作用するいわゆる「低圧形」の圧縮機は、必然的
に、潤滑油溜めが吸入側に設けられ、圧縮機から出た潤
滑油は全てそのまま圧縮機から吐出され、また各摺動部
を潤滑し、密閉容器内に飛散された潤滑油は、吸入冷媒
の流速が非常に大きい場合などには多量に吸入口より圧
縮室に吸い込まれ、そのまま圧縮機から吐出されるよう
な構造になっている。圧縮機から吐出される潤滑油が多
すぎると、密閉容器内の潤滑油溜めに確保される潤滑油
量が、少量あるいは不安定となり、潤滑不良を招き信頼
性を低下させるばかりでなく、冷凍機の冷凍能力も低下
させる。2. Description of the Related Art Scroll compressors include a small amount of lubricating oil that is supplied to a compressor for the purpose of sealing a leakage gap of a compression chamber composed of fixed spiral blades and orbiting spiral blades and lubricating a sealing material at the tip of the blades. After lubricating each sliding part, it is configured to be scattered in a closed container. Generally, so-called "low-pressure" compressors, in which the pressure of the refrigerant gas on the suction side acts inside the closed container, are inevitably provided with a lubricating oil reservoir on the suction side, and all the lubricating oil discharged from the compressor is left as it is. A large amount of lubricating oil discharged from the compressor and lubricating each sliding part and scattered in the sealed container is sucked into the compression chamber from the suction port in a large amount when the flow velocity of the suction refrigerant is extremely large, and is left as it is. The structure is such that it is discharged from the compressor. If the amount of lubricating oil discharged from the compressor is too large, the amount of lubricating oil reserved in the lubricating oil reservoir in the closed container becomes small or unstable, which not only leads to poor lubrication and lowers reliability, but also reduces the refrigerating machine. Also lowers the refrigeration capacity.

従って、低圧式の圧縮機は常に適量の潤滑油を圧縮機
から吐出させると伴に、潤滑油溜めに充分な潤滑油を確
保することが重要である。従来この種の圧縮機は、例え
ば特開昭63−140879号公報に示されているように、第２
図のような構造になっていた。Therefore, it is important for a low-pressure compressor to always discharge an appropriate amount of lubricating oil from the compressor and to secure sufficient lubricating oil in a lubricating oil reservoir. Conventionally, this type of compressor has been disclosed in Japanese Unexamined Patent Publication No. 63-140879, for example.
The structure was as shown in the figure.

27は密閉容器で、内部に電動機28の固定子29と回転子
30を配設し、電動機28の上方にスクロール式の圧縮機構
31を設け、その駆動軸のクランク軸32は回転子30に結合
されている。33は吸入管で、この吸入管33から吸入され
た冷媒は、密閉容器27に入り、吸入口34から圧縮機構31
を経て、圧縮機の外部へ吐出される。35は固定渦巻羽根
部品、36は旋回渦巻羽根部品で、37はその旋回渦巻羽根
軸であり、両者がかみ合い複数個の圧縮室40を形成す
る。41はクランク軸32の第１主軸、42は同第２主軸であ
り、43、44はこの第１主軸41、第２主軸42を支承する為
に、軸受部品45に設けられた第１主軸受、第２主軸受で
ある。46は旋回渦巻羽根部品36の自転を防止して旋回の
みをさせる自転拘束部品で、47は旋回渦巻羽根部品36の
軸方向の附勢力を受ける旋回羽根スラスト軸受、48はク
ランク軸32の第１主軸41と第２主軸42の間に当該クラン
ク軸にかかる軸方向の荷重を支承するクランク軸スラス
ト軸受部、49は、クランク軸32の偏心軸受部であり、旋
回渦巻羽根軸37が嵌入される。50はクランク軸の下端に
取り付けられた給油ポンプであり、51はクランク軸32の
クランク軸スラスト軸受部48と、偏心軸受部49とを連通
するように設けられた連通孔、52は軸受部品45に水平方
向に設けられた返油口であり、潤滑後の油を電動機28の
回転子30の外径より外方に油の勢いで排出するようにな
っている。53は密閉容器27の底部に設けられた潤滑油溜
めである。Reference numeral 27 denotes a sealed container, in which a stator 29 of a motor 28 and a rotor
30 and a scroll-type compression mechanism above the motor 28
A crankshaft 32 of the drive shaft is connected to the rotor 30. Reference numeral 33 denotes a suction pipe, and the refrigerant sucked from the suction pipe 33 enters the closed container 27, and enters the compression mechanism 31 through the suction port.
Is discharged to the outside of the compressor. Numeral 35 denotes a fixed spiral blade component, numeral 36 denotes a swirling spiral blade component, and numeral 37 denotes a swirling spiral blade shaft, which meshes to form a plurality of compression chambers 40. 41 is a first main shaft of the crankshaft 32, 42 is a second main shaft thereof, and 43 and 44 are first main bearings provided on a bearing part 45 for supporting the first main shaft 41 and the second main shaft 42. , The second main bearing. Reference numeral 46 denotes a rotation restricting component that prevents rotation of the swirling spiral blade component 36 and performs only rotation. 47 denotes a rotating blade thrust bearing that receives an urging force in the axial direction of the swirling spiral blade component 36. 48 denotes a first of the crankshaft 32. A crankshaft thrust bearing portion 49 for supporting an axial load applied to the crankshaft between the main shaft 41 and the second main shaft 42 is an eccentric bearing portion of the crankshaft 32, and the swirling spiral blade shaft 37 is fitted therein. . Reference numeral 50 denotes a refueling pump attached to the lower end of the crankshaft, 51 denotes a communication hole provided to communicate the crankshaft thrust bearing 48 of the crankshaft 32 and the eccentric bearing 49, and 52 denotes a bearing part 45. The lubricating oil outlet is provided in the horizontal direction, and discharges the lubricated oil outward from the outer diameter of the rotor 30 of the electric motor 28 with the force of the oil. Reference numeral 53 denotes a lubricating oil reservoir provided at the bottom of the closed container 27.

発明が解決しようとする課題 しかし、このような構造の潤滑経路はいくつかの課題
を有していた。Problems to be Solved by the Invention However, the lubrication path having such a structure has several problems.

第１に返油口を水平に設け、油の排出の勢いで回転子
より外側に排出し、回転子によって油が飛び散り、吸入
冷媒と一緒に圧縮室内に入り、圧縮機から多量のオイル
が吐出されるのを防ぐ構造になっているが、油に勢いが
少ない低回転の運転では排出した油が軸受部品を伝って
しまい、回転子の方向に流れ、油を飛散させる課題があ
った。また、返油口を垂直下方にあけることも従来取ら
れていたがこの方法では回転子外径より余り離れた位置
に取れず、完全に飛散を防ぐことが出来ない。また、特
開昭62−135692号公報ではこの問題を解決するために圧
縮機構部から排出する油の経路と吸入冷媒の経路を電動
機固定子を使って、分離する方法が示されている。この
方法は吸入冷媒への排出油の巻き込み防止においては完
全ではあるが、構造が複雑であり、吸入冷媒経路が複雑
となり、吸入冷媒が加熱され効率が低下するという課題
を有している。First, an oil return port is provided horizontally, and the oil is discharged from the rotor by the force of oil discharge. Oil is scattered by the rotor, enters the compression chamber together with the suctioned refrigerant, and discharges a large amount of oil from the compressor. However, in low-speed operation where the oil has little momentum, the discharged oil travels through the bearing parts, flows in the direction of the rotor, and has a problem of scattering the oil. Also, it has been conventionally used to open the oil return port vertically downward. However, in this method, the oil return port cannot be set at a position far away from the outer diameter of the rotor, and scattering cannot be completely prevented. In order to solve this problem, Japanese Patent Application Laid-Open No. 62-135592 discloses a method of separating the path of the oil discharged from the compression mechanism from the path of the suction refrigerant using a motor stator. Although this method is perfect in preventing the discharge oil from being caught in the suction refrigerant, it has a problem that the structure is complicated, the suction refrigerant path is complicated, and the suction refrigerant is heated and the efficiency is reduced.

第２に特開昭63−140879号公報、特開昭62−135692号
公報などに見られる潤滑経路においては返油口に戻る油
はクランク軸の軸受を潤滑した油であり、旋回羽根スラ
スト軸受を潤滑した油は旋回渦巻部品の外周に流れ出す
構造になっている。このため旋回羽根スラスト軸受を潤
滑した油は、遠心力のはたらきで自転拘束部品と旋回渦
巻部品との隙間を経て圧縮室内に入ってしまい多量の油
が圧縮機の外部へ持ち出され、各摺動部の潤滑不良を招
くおそれを有していた。Secondly, in the lubrication path disclosed in JP-A-63-140879 and JP-A-62-135692, the oil returning to the oil return port is oil lubricating the bearing of the crankshaft, and the rotating blade thrust bearing The lubricated oil flows out to the outer periphery of the swirling spiral part. As a result, the oil lubricating the swirl vane thrust bearings enters the compression chamber through the gap between the rotation restraining component and the swirl spiral component due to the action of centrifugal force, and a large amount of oil is taken out of the compressor and There was a risk of causing poor lubrication of the part.

そこで本発明は、上記従来の問題点を解消するもの
で、簡単な構造で各摺動部を潤滑後の油を、吸入冷媒に
巻き込まれにくくして、圧縮室への吸入を防ぐととも
に、旋回羽根スラスト軸受を潤滑した油の圧縮室への吸
入をも防ぎ、圧縮機外部に吐出される油の量を低減し、
密閉容器底部の潤滑油を確保し、各摺動部への潤滑油の
供給を安定化し、信頼性の高い圧縮機を得ること目的と
するものである。Therefore, the present invention solves the above-mentioned conventional problems, and makes it difficult for the oil after lubricating each sliding portion to be drawn into the suction refrigerant with a simple structure, thereby preventing the oil from being sucked into the compression chamber and turning the oil. It also prevents the oil that lubricated the blade thrust bearings from being sucked into the compression chamber, reducing the amount of oil discharged outside the compressor,
It is an object of the present invention to secure a lubricating oil at the bottom of a sealed container, stabilize the supply of the lubricating oil to each sliding portion, and obtain a highly reliable compressor.

課題を解決するための手段 上記課題を解決するために本発明は密閉容器内の上方
に圧縮機構を配設し、下方に電動機を配設し、底部に潤
滑油溜を設け、前記圧縮機構を、固定渦巻き羽根部品
と、その固定渦巻き羽根部品の下側に位置する旋回渦巻
き羽根部品と、前記電動機に固着し、前記旋回渦巻き羽
根部品を駆動するクランク軸と、このクランク軸を支承
する軸受部品と、前記旋回渦巻き羽根部品と前記軸受部
品の間に位置し、前記旋回渦巻き羽根部品にかかる軸方
向の附勢力を支える旋回羽根スラスト軸受と、前記旋回
渦巻き羽根部品と前記軸受部品との間で、かつ前記旋回
羽根スラスト軸受の外側に位置し、前記旋回渦巻き羽根
部品の自転を防止する自転拘束部品とを含んで構成し、
給油ポンプから供給された潤滑油が前記旋回羽根スラス
ト軸受を潤滑した後、前記軸受部品に下方外向きに傾斜
させて設けられ、入口が前記旋回羽根スラスト軸受、前
記自転拘束部品、前記軸受部品および前記旋回渦巻き羽
根部品とで形成される空間に開口する返油孔より排出さ
れ、前記密閉容器の下方へ至る潤滑給油回路を設けたも
のである。Means for Solving the Problems In order to solve the above problems, the present invention arranges a compression mechanism in the upper part of the closed container, arranges a motor below, provides a lubricating oil reservoir at the bottom, and sets the compression mechanism A fixed spiral blade component, a swirling spiral blade component located below the fixed spiral blade component, a crankshaft fixed to the electric motor and driving the swirling spiral blade component, and a bearing component supporting the crankshaft. A swirling blade thrust bearing, which is located between the swirling spiral blade component and the bearing component and supports an axial urging force applied to the swirling spiral blade component, between the swirling spiral blade component and the bearing component; And a rotation restraining component that is located outside the turning blade thrust bearing and that prevents rotation of the turning spiral blade component,
After lubricating oil supplied from an oil supply pump lubricates the swirl vane thrust bearing, the lubricating oil is provided on the bearing component so as to be inclined downward and outward, and an inlet is provided at the swirl vane thrust bearing, the rotation restraining component, the bearing component and A lubricating oil supply circuit is provided, which is discharged from an oil return hole opened in a space formed by the swirling swirl vane component and extends below the closed container.

作用 上記手段により本願発明は、圧縮機構摺動部を潤滑し
た油は、圧縮機構下部に下方外向きに傾斜させて設けら
れた返油孔より排出される。排出された油は斜め下方に
向かうため確実に回転子の外径の外側に落とすことがで
き、回転子で油が飛散される可能性が少ない。また、回
転数が低い運転でも返油孔を出た油が回転子の方向であ
る内側に向かって伝わって落ちる可能性が少ない。According to the present invention, the oil lubricating the sliding portion of the compression mechanism is discharged from the oil return hole provided at the lower portion of the compression mechanism so as to be inclined downward and outward. Since the discharged oil goes obliquely downward, it can be reliably dropped outside the outer diameter of the rotor, and there is little possibility that the oil is scattered by the rotor. In addition, even when the engine is operated at a low rotation speed, there is little possibility that the oil that has exited from the oil return hole is transmitted toward the inside of the rotor and falls.

さらに、本願発明は、潤滑油が旋回羽根スラスト軸受
を潤滑した後、前記軸受部品に下方外向きに傾斜させて
設けられた返油孔より***されるので、旋回羽根スラス
ト軸受を潤滑した油のほとんどが、返油孔から排出可能
となり、自転拘束部品をこえ、旋回羽根部品の外周から
圧縮室内に吸入される油の量を少なくすることが出来
る。返油孔は自転拘束部品の内側に開口すると自転拘束
部品がしきりとなり、圧縮室内にはいる油の量をより抑
えることが出来る。Further, according to the present invention, since the lubricating oil is excreted from the oil return hole provided in the bearing component so as to be inclined downward and outward after lubricating the swirling vane thrust bearing, the lubricating oil of the lubricating vane thrust bearing is provided. Most of the oil can be discharged from the oil return hole, exceeding the rotation restricting component, and reducing the amount of oil sucked into the compression chamber from the outer periphery of the turning blade component. When the oil return hole is opened inside the rotation restricting component, the rotation restricting component becomes full and the amount of oil entering the compression chamber can be further suppressed.

これらの結果、圧縮機外部に吐出される油の量を低減
することができ、密閉容器底部の潤滑油は充分に確保さ
れ、各摺動部への潤滑油の供給は安定し、信頼性の高い
圧縮機を得ることが出来る。As a result, the amount of oil discharged to the outside of the compressor can be reduced, the lubricating oil at the bottom of the sealed container is sufficiently ensured, the lubricating oil supply to each sliding portion is stable, and the reliability is improved. A high compressor can be obtained.

実施例 以下、本発明の一実施例を添付図面にもとずいて説明
する。第１図は本発明の一実施例を示すスクロール圧縮
機の縦断面図で、図中27は密閉容器で、内部に電動機28
の固定子29と回転子30を配設し、電動機28の上方にスク
ロール式の圧縮機構31を設け、その駆動軸のクランク軸
32は回転子30に結合されている。33は吸入管で、この吸
入管33から吸入された冷媒は、密閉容器27に入り、吸入
口34から圧縮機構31を経て、圧縮機の外部へ吐出され
る。35は固定渦巻羽根部品、36は旋回渦巻羽根部品で、
37はその旋回渦巻羽根軸であり、両者がかみ合い複数個
の圧縮室40を形成する。41はクランク軸32の第１主軸、
42は同第２主軸であり、43、44はこの第１主軸41、第２
主軸42を支承する為に、軸受部品45に設けられた第１主
軸受、第２主軸受である。46は旋回渦巻羽根部品36の自
転を防止して旋回のみをさせる自転拘束部品で、その内
側に旋回渦巻羽根部品36の軸方向の附勢力を受ける旋回
羽根スラスト軸受47が配されている。48はクランク軸32
の第１主軸41と第２主軸42の間に当該クランク軸にかか
る軸方向の荷重を支承するクランク軸スラスト軸受部、
49は、クランク軸32の偏心軸受部であり、旋回渦巻羽根
軸37が嵌入される。50はクランク軸32の下端に取り付け
られた給油ポンプであり、51はクランク軸32のクランク
軸スラスト軸受部48と、偏心軸受部49とを連通するよう
に設けられた連通孔である。53は密閉容器27の底部に設
けられた潤滑油溜めである。55は軸受部品45の水平部に
設けられた返油孔であり、圧縮機構側に開口する返油孔
の入口55aは前記旋回羽根スラスト軸受47の外側、自転
拘束部品46の内側に位置している。一方返油孔55の出口
55bは入口位置に対し斜め外側下方に位置し、返油孔は
下方外向きに傾斜してあけられている。出口55bは円周
方向においては吸入口34とは離れて位置し、半径方向に
おいては回転子外径より外側に位置している。Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.
The stator 29 and the rotor 30 are arranged, and a scroll-type compression mechanism 31 is provided above the electric motor 28, and the crankshaft of the drive shaft thereof is provided.
32 is coupled to rotor 30. Reference numeral 33 denotes a suction pipe. The refrigerant sucked from the suction pipe 33 enters the closed container 27, and is discharged from the suction port 34 to the outside of the compressor via the compression mechanism 31. 35 is a fixed spiral blade part, 36 is a swirl spiral blade part,
Numeral 37 denotes a swirling spiral blade shaft, which meshes with each other to form a plurality of compression chambers 40. 41 is a first main shaft of the crankshaft 32,
42 is the second main spindle, 43 and 44 are the first main spindle 41 and the second main spindle.
A first main bearing and a second main bearing are provided on a bearing component 45 for supporting the main shaft 42. Reference numeral 46 denotes a rotation restricting component for preventing the rotation of the swirling spiral blade component 36 and performing only the rotation. A rotating blade thrust bearing 47 for receiving the urging force of the swirling spiral blade component 36 in the axial direction is disposed inside thereof. 48 is the crankshaft 32
A crankshaft thrust bearing portion for supporting an axial load applied to the crankshaft between the first main shaft 41 and the second main shaft 42;
Reference numeral 49 denotes an eccentric bearing of the crankshaft 32, into which the swirling spiral blade shaft 37 is fitted. Reference numeral 50 denotes a refueling pump attached to the lower end of the crankshaft 32, and reference numeral 51 denotes a communication hole provided to communicate the crankshaft thrust bearing 48 of the crankshaft 32 with the eccentric bearing 49. Reference numeral 53 denotes a lubricating oil reservoir provided at the bottom of the closed container 27. Reference numeral 55 denotes an oil return hole provided in a horizontal portion of the bearing component 45, and an inlet 55a of the oil return hole opening to the compression mechanism side is located outside the turning blade thrust bearing 47 and inside the rotation restraining component 46. I have. On the other hand, the exit of oil return hole 55
55b is positioned obliquely outward and downward with respect to the inlet position, and the oil return hole is formed to be inclined downward and outward. The outlet 55b is located apart from the suction port 34 in the circumferential direction, and is located outside the outer diameter of the rotor in the radial direction.

以上のように構成されたスクロール圧縮機について、
以下その動作を説明する。電動機28によりクランク軸32
が回転されると、給油ポンプ50により潤滑油溜め53の潤
滑油は、クランク軸32の内方を通って第２軸受44に供給
される。第２軸受44を下方から上方へ流れ、クランク軸
スラスト軸受部48に到り、そこで分岐して、第１主軸受
43を潤滑して、旋回羽根スラスト軸受47に到る回路と、
連通孔51を経て偏心軸受49を潤滑して、旋回羽根スラス
ト軸受47に到る回路に分かれる。Regarding the scroll compressor configured as above,
The operation will be described below. Crankshaft 32 by electric motor 28
Is rotated by the oil supply pump 50, the lubricating oil in the lubricating oil reservoir 53 is supplied to the second bearing 44 through the inside of the crankshaft 32. It flows upward from the second bearing 44 to the crankshaft thrust bearing portion 48, where it branches off to form the first main bearing.
A circuit that lubricates 43 and reaches the swirl vane thrust bearing 47;
The eccentric bearing 49 is lubricated through the communication hole 51, and is divided into a circuit reaching the swirl vane thrust bearing 47.

旋回羽根スラスト軸受47に到った潤滑油は、このスラ
スト軸受を潤滑した後、その外側に出る。旋回羽根スラ
スト軸受47と自転拘束部品46で形成される空間には返油
孔55の入口55aが開口しており、大部分の潤滑油は返油
孔55に入る。自転拘束部品56は潤滑油が旋回羽根部品の
外周に流出する仕切りとなるため、圧縮室40に入る、潤
滑油を少なくすることが出来る。一方、返油孔55に入っ
た潤滑油は斜め下方に向かって流れ、返油孔55の出口55
bから排出される。排出された油は斜め下方に向かって
落下するため、回転子にあたることなく、固定子の外側
を密閉容器27の底部の潤滑油溜め53に戻る。潤滑油は斜
め下方に向かって落ちるため、油の排出する勢いの少な
い低回転数でも軸受部品45を伝って、回転子側に流れる
ことはない。このため、回転子にあたって潤滑油が飛び
散ることがなく、吸入冷媒に巻き込まれる油を少なくす
ることが出来る。さらに、返油孔55の出口55bと吸入口3
4とは同一角度に設けられていない為、返油孔55より排
出された潤滑油は吸入冷媒の流速の速い場所から離すこ
とができ、落下する潤滑油のしぶきを吸入冷媒に巻き込
むことがない。これらの結果、圧縮室内40に入る潤滑油
を経らすことが出来る。The lubricating oil that has reached the swirl vane thrust bearing 47, after lubricating the thrust bearing, flows out of the thrust bearing. An inlet 55a of an oil return hole 55 is opened in a space formed by the swirl vane thrust bearing 47 and the rotation restricting component 46, and most of the lubricating oil enters the oil return hole 55. Since the rotation restricting component 56 serves as a partition through which lubricating oil flows out to the outer periphery of the swirling blade component, lubricating oil entering the compression chamber 40 can be reduced. On the other hand, the lubricating oil that has entered the oil return hole 55 flows diagonally downward, and
Emitted from b. Since the discharged oil falls obliquely downward, it returns outside the stator to the lubricating oil reservoir 53 at the bottom of the sealed container 27 without hitting the rotor. Since the lubricating oil falls obliquely downward, the lubricating oil does not flow to the rotor side through the bearing component 45 even at a low rotation speed at which the oil is not momentarily discharged. Therefore, the lubricating oil does not splash on the rotor, and the amount of oil caught in the suction refrigerant can be reduced. Further, the outlet 55b of the oil return hole 55 and the suction port 3
Since the lubricating oil discharged from the oil return hole 55 is not provided at the same angle as that of 4, the lubricating oil discharged from the oil return hole 55 can be separated from the place where the flow velocity of the suction refrigerant is fast, and the splash of the lubricating oil falling does not get caught in the suction refrigerant . As a result, the lubricating oil entering the compression chamber 40 can be passed.

従って、各摺動部を潤滑した油が圧縮室内40に運ば
れ、圧縮機の外部に吐出される量を低減することがで
き、安定して密閉容器底部の潤滑油溜53に返される。こ
の結果、潤滑油は充分に確保され、各摺動部への潤滑油
の供給は安定し、信頼性の高い圧縮機を得ることが出来
る。また、返油孔をあけるだけの簡単な方法で潤滑油の
圧縮機からの吐出量を低減できる。Therefore, the oil lubricating each sliding portion is carried into the compression chamber 40, and the amount discharged to the outside of the compressor can be reduced, and the oil is stably returned to the lubricating oil reservoir 53 at the bottom of the sealed container. As a result, the lubricating oil is sufficiently ensured, the lubricating oil supply to each sliding portion is stable, and a highly reliable compressor can be obtained. Further, the discharge amount of the lubricating oil from the compressor can be reduced by a simple method of opening the oil return hole.

発明の効果 以上のように本発明によれば、返油孔の簡単の構造で
各摺動部を潤滑した油が圧縮室内に入る量を抑え圧縮機
運転中の油不足を防止し、安定した潤滑が行え、信頼性
の高い圧縮機がを実現できる等の効果を奏する。Advantageous Effects of the Invention As described above, according to the present invention, with a simple structure of the oil return hole, the amount of oil lubricating each sliding part is suppressed into the compression chamber and oil shortage during compressor operation is prevented, and stable Lubrication can be performed, and an effect that a highly reliable compressor can be realized is achieved.

【図面の簡単な説明】[Brief description of the drawings]

第１図は本発明の一実施例スクロール圧縮機の縦断面
図、第２図は従来のスクロール圧縮機の縦断面図であ
る。 27……密閉容器、28……電動機、30……回転子、31……
圧縮機構、32……クランク軸、34……吸入口、35……固
定渦巻羽根部品、36……旋回渦巻羽根部品、45……軸受
部品、46……自転拘束部品、47……旋回羽根スラスト軸
受、50……給油ポンプ、53……潤滑油溜め、55……返油
孔、55a……返油孔入口、55b……返油孔出口。FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional scroll compressor. 27 ... closed container, 28 ... motor, 30 ... rotor, 31 ...
Compression mechanism, 32 ... Crank shaft, 34 ... Suction port, 35 ... Fixed swirl vane part, 36 ... Swirl swirl vane part, 45 ... Bearing part, 46 ... Spinning restraint part, 47 ... Swirl vane thrust Bearings, 50: Oil supply pump, 53: Lubricating oil reservoir, 55: Oil return hole, 55a: Oil return hole inlet, 55b: Oil return hole outlet.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−135692（ＪＰ，Ａ) 実開 昭61−6691（ＪＰ，Ｕ) 実開 昭54−120710（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-135692 (JP, A) JP-A-61-16691 (JP, U) JP-A-54-120710 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】密閉容器内の上方に圧縮機構を配設し、下
方に電動機を配設し、底部に潤滑油溜を設け、前記圧縮
機構を、固定渦巻き羽根部品と、その固定渦巻き羽根部
品の下側に位置する旋回渦巻き羽根部品と、前記電動機
に固着し、前記旋回渦巻き羽根部品を駆動するクランク
軸と、このクランク軸を支承する軸受部品と、前記旋回
渦巻き羽根部品と前記軸受部品の間に位置し、前記旋回
渦巻き羽根部品にかかる軸方向の附勢力を支える旋回羽
根スラスト軸受と、前記旋回渦巻き羽根部品と前記軸受
部品との間で、かつ前記旋回羽根スラスト軸受の外側に
位置し、前記旋回渦巻き羽根部品の自転を防止する自転
拘束部品とを含んで構成し、給油ポンプから供給された
潤滑油が前記旋回羽根スラスト軸受を潤滑した後、前記
軸受部品に下方外向きに傾斜させて設けられ、入口が前
記旋回羽根スラスト軸受、前記自転拘束部品、前記軸受
部品および前記旋回渦巻き羽根部品とで形成される空間
に開口する返油孔より排出され、前記密閉容器の下方へ
至る潤滑給油回路を有するスクロール圧縮機。1. A compression mechanism is disposed in an upper part of an airtight container, an electric motor is disposed in a lower part, a lubricating oil reservoir is provided in a bottom part, and the compression mechanism is composed of a fixed spiral blade part and a fixed spiral blade part. A rotating swirl vane component located on the lower side, a crankshaft fixed to the electric motor and driving the swirl spiral blade component, a bearing component for supporting the crankshaft, a swirling spiral blade component and the bearing component. A swirl vane thrust bearing for supporting an axial biasing force applied to the swirl vane part, between the swirl vane part and the bearing part, and outside the swirl vane thrust bearing. A rotation restraining part for preventing the rotation of the swirling spiral blade part, and lubricating oil supplied from an oil supply pump lubricates the swirling blade thrust bearing. The inlet is discharged from an oil return hole opening in a space formed by the swirl vane thrust bearing, the rotation restricting part, the bearing part and the swirl spiral vane part. A scroll compressor having a lubricating oil supply circuit that goes down.