JPH0447192A - Compression device for extremely low temperature refrigerator - Google Patents
Compression device for extremely low temperature refrigeratorInfo
- Publication number
- JPH0447192A JPH0447192A JP15655690A JP15655690A JPH0447192A JP H0447192 A JPH0447192 A JP H0447192A JP 15655690 A JP15655690 A JP 15655690A JP 15655690 A JP15655690 A JP 15655690A JP H0447192 A JPH0447192 A JP H0447192A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- separator
- sump
- compression element
- return passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000006835 compression Effects 0.000 title claims abstract description 43
- 238000007906 compression Methods 0.000 title claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 27
- 239000001307 helium Substances 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（Ｍ業上の利用分野）
本発明は、作動流体にヘリウムガスを用い、圧縮ガスの
異常温度上昇を抑制するため圧縮室内に油インジェクン
ａンを行うようにした極低温冷凍機の圧縮装置に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of application in M business) The present invention relates to an electric motor which uses helium gas as a working fluid and injects oil into the compression chamber in order to suppress an abnormal temperature rise of the compressed gas. The present invention relates to a compression device for a low temperature refrigerator.
（従来の技術）
従来、実開昭５６−８５０８７号公報に開示され且つ第
３図に示すように、一対のスクロール（Ａ）（Ｂ）をも
つ圧縮要素（Ｃ）の吐出ライン（Ｈ）に、油分離器（Ｓ
）を介装して、該油分離器（Ｓ）と前記圧縮要素（Ｃ）
に開口する油性入口（Ｊ）との間に、減圧手段（Ｖ）を
もつ油インジェクシｅン管（Ｒ）を接続し、高低差圧を
利用して圧縮ガスに油を注入し、この注入油でガス冷却
を行い、吐出ガスと共に流出される前記注入油を油分屋
器（Ｓ）で分離して、再び注入口（Ｊ）を介して注入す
るようにしている。(Prior Art) Conventionally, as disclosed in Japanese Utility Model Application Publication No. 56-85087 and shown in FIG. , oil separator (S
), the oil separator (S) and the compression element (C)
An oil injection pipe (R) with a pressure reducing means (V) is connected between the oil inlet (J) that opens at the The injected oil, which flows out together with the discharged gas, is separated by an oil separator (S) and then injected again through the inlet (J).
（発明が解決しようとする課題）
しかし、底部に油溜を備え、設入ガスを開放する低圧ド
ーム形のケーシング内に圧縮−要素を配設したものでは
、前記油分離器（Ｓ）と圧縮要素（Ｃ）との間で単に一
定量の油が循環するだけでなく、前記圧縮要素（Ｃ）に
は、油溜から油ポンプ等を介して各摺動部を潤滑した後
の油等、ケーシング内に浮遊する油分が吸入ガスと共に
取込まれるため、この吸入ガスと一緒に取込まれる油が
吐出ライン（Ｈ）に余分に吐出され、長時間運転後には
、前記油分離器（Ｓ）に溜る油量が増え、逆に、ケーシ
ング底部の油溜の油面が徐々に低下して、摺動部の潤滑
に必要な油が不足し、軸受部の焼付き等、圧縮機の運転
に重大な障害が発生する問題がある。(Problem to be Solved by the Invention) However, in the case where the compression element is arranged in a low-pressure dome-shaped casing that has an oil reservoir at the bottom and releases the introduced gas, the oil separator (S) and the compression Not only does a certain amount of oil circulate between the element (C), but also oil, etc. that has been used to lubricate each sliding part from the oil reservoir via an oil pump etc. Since oil floating in the casing is taken in together with the suction gas, excess oil taken in with the suction gas is discharged into the discharge line (H), and after long-term operation, the oil separator (S) On the other hand, the oil level in the oil reservoir at the bottom of the casing gradually decreases, resulting in a lack of oil needed to lubricate the sliding parts, which can cause problems such as seizure of bearings and problems with compressor operation. There is a problem that causes a serious failure.
本発明の主な目的は、油インジェクションによるガス冷
却が行えながら、低圧ドームを構成するケーシング底部
の油溜の油面を適正に保ち、潤滑を保証して信頼性の向
上が図れる極低温冷凍機の圧縮装置を提供することにあ
る。The main purpose of the present invention is to provide a cryogenic refrigerator that can perform gas cooling using oil injection while maintaining an appropriate oil level in the oil reservoir at the bottom of the casing that makes up the low-pressure dome, ensuring lubrication and improving reliability. The purpose of this invention is to provide a compression device for.
（課題を解決するための手段）
そこで、本発明では、上記目的を達成するため、底部に
油溜（１）をもつ低圧ドーム形のケーシング（２）に、
油性入口（３）をもつ圧縮要素（４）を内装した極低温
冷凍機の圧縮装置であって、前記圧縮要素（４）の吐出
ライン（５）に油分離器（６）を設けて、この油分離器
（６）の底部と前記油性入口（３）との間を、油インジ
ェクション通路（７）で接続すると共に、前記油分離器
（６）の規定油面高さ位置に、前記油溜（１）に連通ず
る油戻し通路（８）を開口した。(Means for Solving the Problem) Therefore, in the present invention, in order to achieve the above object, a low pressure dome-shaped casing (2) having an oil sump (1) at the bottom,
A compression device for a cryogenic refrigerator equipped with a compression element (4) having an oil inlet (3), wherein an oil separator (6) is provided in the discharge line (5) of the compression element (4). The bottom of the oil separator (6) and the oil inlet (3) are connected by an oil injection passage (7), and the oil reservoir is installed at a specified oil level height position of the oil separator (6). An oil return passage (8) communicating with (1) was opened.
第２に、上記構成で、油戻し通路（８）の減圧手段に、
オリフィス（９）を用いた。Secondly, in the above configuration, the pressure reducing means of the oil return passage (8)
Orifice (9) was used.
第３に、油分離器を単段構成ではなく、圧縮要素（４）
の吐出ライン（５）に第１及び第２油分離器（８ａ）（
Ｅｌｂ）を直列に設けて、初段側の第１油分離器（６ａ
）の底部と油性入口（３）との間を、油インジェクシ６
７通路（７）で接続すると共に、前記第１油分離器（６
ａ）の規定油面高さ位置に、油溜（１）に連通ずる第１
油戻し通路（８ａ）を、又、前記第２油分離器（６ｂ）
の底部に、油溜（１）に連通ずる第２油戻し通路（８ｂ
）を各々開口した。Third, the oil separator is not a single stage configuration, but a compression element (4)
The first and second oil separators (8a) (
Elb) are installed in series, and the first oil separator (6a
) between the bottom of the oil injector 6 and the oil inlet (3).
7 passages (7), and the first oil separator (6).
At the specified oil level height position in a), there is a first pipe connected to the oil sump (1).
The oil return passage (8a) is also connected to the second oil separator (6b).
A second oil return passage (8b) communicating with the oil sump (1) is provided at the bottom of the
) were each opened.
第４に、上記第３の構成で、第１油戻し通路（８ａ）の
減圧手段に、オリフィス（９）を、第２油戻し通路（８
ｂ）の減圧手段に、キャピラリーチューブ（１０）をそ
れぞれ用いた。Fourthly, in the third configuration, the orifice (9) is connected to the pressure reducing means of the first oil return passage (8a), and the second oil return passage (8a) is provided with the orifice (9).
A capillary tube (10) was used as the pressure reducing means in b).
（作用）
油分離器（６）で分離された油は、油インジェクション
通路（７）を介して差圧により圧縮要素（４）に注入さ
れ、吐出ガスの冷却が行えると共に、ケー／ング（２）
内に浮遊する油分等が圧縮要素（４）内に取込まれて吐
出ライン（５）に流出される油量が増え、油分離器（６
）での分離油が増えても、該油分離器（６）に溜る油が
規定油面を越えると、過剰な油は、油戻し通路（８）を
介して油溜（１）に返され、油溜（１）での油面低下を
防止できる。(Function) The oil separated by the oil separator (6) is injected into the compression element (4) via the oil injection passage (7) by differential pressure, cooling the discharged gas, and )
Floating oil and other substances are taken into the compression element (4) and the amount of oil flowing out to the discharge line (5) increases, causing the oil separator (6
Even if the separated oil increases in the oil separator (6), if the oil accumulated in the oil separator (6) exceeds the specified oil level, the excess oil is returned to the oil sump (1) via the oil return passage (8). , it is possible to prevent the oil level from dropping in the oil sump (1).
第２の手段によれば、オリフィスの特性上、その油量は
油の粘度のほぼ３分の１乗に比例して変化するのみで、
油の粘度即ち油温の変化による影響を受けにくく又、そ
の通過流速がヘリウムの音速を越えないため、油分離器
（６）の油面が低い場合にも、油戻し通路（８）を介し
て吐出ガスが吸入側へバイパスする量を低減できる。According to the second means, due to the characteristics of the orifice, the amount of oil changes only in proportion to approximately one third power of the viscosity of the oil,
Since it is not easily affected by changes in oil viscosity, that is, oil temperature, and its passing flow rate does not exceed the sonic speed of helium, even when the oil level in the oil separator (6) is low, it can be used through the oil return passage (8). This can reduce the amount of discharged gas that bypasses to the suction side.
第３の手段によれば、第１油分離器（６ａ）での分離油
は油インジェクシロン通路（７）を介して圧縮要素（４
）に注入され、又、第１油分離器（６ａ）に過剰に溜る
油及びこの第１油分離器（６ａ）では分離されずに第２
油分離器（６ｂ）で分離される油は、それぞれ第１及び
第２油戻し通路（８ａ） （８ｂ）を介して油溜（１
）に返され、２段階に油分離及びその油戻しが行える。According to the third means, the separated oil in the first oil separator (6a) is passed through the oil injection passage (7) to the compression element (4).
), and the oil that accumulates in excess in the first oil separator (6a) and the oil that is not separated in this first oil separator (6a) and are injected into the second oil separator (6a).
The oil separated by the oil separator (6b) is transferred to the oil sump (1) via the first and second oil return passages (8a) and (8b), respectively.
), and oil separation and oil return can be performed in two stages.
第４の手段によれば、第１油分離器（６ａ）から油溜（
１）への油戻しは、オリフィス（９）を介して行われる
ため、油の粘度による影響を低減できると共に、吐出ガ
スのバイパス量を低減できる。一方、第２油分離器（６
ｂ）での戻し油量は少なく、第２油戻し通路（８ｂ）に
は開口率の小さな減圧機構を用いれば足り、この場合に
、オリフィスではその穴径の微小加工が困難であるのに
対して、キャピラリーチューブ（１０）を用いたため、
該チューブ（１０）を小径にすることによりその開口率
を容易に小さくすることができ、第２油分離器（６ｂ）
と低圧側との連通面積を縮小できて、該第２油分離器（
６ｂ）からの吐出ガスのバイパス量も低減できる。According to the fourth means, from the first oil separator (6a) to the oil sump (
Since the oil is returned to 1) through the orifice (9), the influence of the viscosity of the oil can be reduced, and the bypass amount of the discharged gas can be reduced. On the other hand, the second oil separator (6
The amount of oil returned in b) is small, and it is sufficient to use a pressure reducing mechanism with a small opening ratio for the second oil return passage (8b), whereas in this case, it is difficult to micro-machin the hole diameter with an orifice. Since the capillary tube (10) was used,
By making the tube (10) small in diameter, its opening ratio can be easily reduced, and the second oil separator (6b)
and the low pressure side can be reduced, and the second oil separator (
The bypass amount of the discharged gas from 6b) can also be reduced.
（実施例）
第１図において、（１００）はヘリウムガスを圧縮する
圧縮機本体であり、底部に油溜（１）をもつ低圧ドーム
形のケーシング（２）に、圧縮行程途中の圧縮室に開口
する油性入口（３）をもつスクロール形式の圧縮要素（
４）を内装している。前記圧縮要素（４）は、クランク
部（４１）及び駆動軸（４２）を介してモータ（４３）
に連動しており、吸入ライン（２０）を介してケーシン
グ（２）内に取込む低圧ガスを圧縮して、高圧ガスを吐
出ライン（５）に吐出するようにしている。又、駆動軸
（４２）の下部には定容積式等の油ポンプ（４４）を設
け、軸受（４５）（４Ｂ）等の摺動部分に給油するよう
にしている。(Example) In Fig. 1, (100) is the main body of a compressor that compresses helium gas, and it has a low-pressure dome-shaped casing (2) with an oil reservoir (1) at the bottom, and a compression chamber in the middle of the compression stroke. A scroll-type compression element (with an open oil inlet (3)
4) is installed inside. The compression element (4) is connected to a motor (43) via a crank part (41) and a drive shaft (42).
The low-pressure gas taken into the casing (2) through the suction line (20) is compressed, and the high-pressure gas is discharged into the discharge line (5). Further, an oil pump (44) of a fixed displacement type or the like is provided at the lower part of the drive shaft (42) to supply oil to sliding parts such as the bearings (45) (4B).
そして、前記高圧ライン（５）及び低圧ライン（２０）
に、各々サージアブソーバ（５１）及びサージボリウム
（２１）を接続すると共に、これらを介してヘリウム膨
張機等の極低温冷却機器（２００）を接続し、この冷却
機器（２００）のヒートステージに絶対温度数に〜数十
に程度の極低温を得るようにしている。尚、（２２）は
吸入フィルタである。And the high pressure line (5) and the low pressure line (20)
A surge absorber (51) and a surge regulator (21) are connected to each, and a cryogenic cooling device (200) such as a helium expander is connected through these, and the heat stage of this cooling device (200) is We are trying to obtain extremely low temperatures in the order of several tens of degrees. Note that (22) is a suction filter.
以上の構成で、前記吐出ライン（５）に、ファン（６２
ａ）を付設する空冷熱交換器（５２）を介して油分離器
（６）を接続し、この油分離器（６）の底部と前記油性
入口（３）との間を、フィルタ（７１）及びオリフィス
で構成する減圧手段（７２）をもつ油インジェクシロン
通路（７）で接続する。又、前記油分離器（６）の側壁
部における規定油面高さ位置に、前記油溜（１）に連通
ずる油戻し通路（８）を開口する。With the above configuration, the fan (62) is connected to the discharge line (5).
An oil separator (6) is connected via an air-cooled heat exchanger (52) attached to a), and a filter (71) is connected between the bottom of the oil separator (6) and the oil inlet (3). and an oil injector passageway (7) having a pressure reducing means (72) constituted by an orifice. Further, an oil return passage (8) communicating with the oil sump (1) is opened at a specified oil level height position on the side wall of the oil separator (6).
前記油冷却器（６）の前段に設ける空冷熱交換器（５２
）は、そのガス冷却コイル（５２ｂ）に吐出ガスを流通
させ、吐出ガス並びにこの吐出ガス中に含まれる油を冷
却するようにしている。An air-cooled heat exchanger (52) provided upstream of the oil cooler (6)
) allows the discharge gas to flow through the gas cooling coil (52b) to cool the discharge gas and the oil contained in the discharge gas.
又、この空冷熱交換器（５２）は前記油溜（１）の油の
冷却をも兼用するもので、その油冷却コイル（５２ｃ）
に油ポンプ（４４）で汲上げる油の一部を流通させると
共に、油戻しライン（４７）を吸入ライン（２０）に接
続して、この吸入ライン（２０）を介して再び前記油溜
（１）に油を返すようにしている。This air-cooled heat exchanger (52) also serves to cool the oil in the oil reservoir (1), and its oil cooling coil (52c)
A part of the oil pumped up by the oil pump (44) is circulated through the oil pump (44), and an oil return line (47) is connected to the suction line (20), and the oil is returned to the oil sump (1) through this suction line (20). ) to return the oil.
前記油戻し通路（８）は、フィルタ（８１）及び減圧手
段を構成するオリフィス（９）を介装し、前記オリフィ
ス（９）の下流部を油戻しライン（４７）に接続し、該
油戻しライン（４７）及び吸入ライン（２０）を介して
、前記油溜（１）に連通させるようにしている。The oil return passage (8) is provided with a filter (81) and an orifice (9) constituting a pressure reducing means, and a downstream part of the orifice (9) is connected to an oil return line (47). He is trying to communicate with the oil sump (1) via a line (47) and a suction line (20).
以上の構成によれば、前記油分離器（６）で分！された
油は、油インジェクン日ン通路（７）を介して差圧によ
り圧縮要素（４）に注入され、吐出ガスを冷却できると
共に、ケーシング（２）内に浮遊する油分等が圧縮要素
（４）内に取込まれて吐出ライン（５）に流出される油
量が増え、油分離器（６）での分離油が増えても、該油
分離器（６）に溜る油が規定曲面を越えると、この過剰
な油は、前記油戻し通路（８）並びに、油戻しライン（
４７）及び吸入ライン（２０）を介して前記油溜（１）
に返されるため、該油溜（１）での油面低下を防止でき
、潤滑に必要な油量を確保できて信頼性の向上が図れる
のである。According to the above configuration, the oil separator (6) can be used in minutes! The oil is injected into the compression element (4) via the oil injector passage (7) by a differential pressure, and the discharged gas can be cooled, and the oil etc. floating in the casing (2) is injected into the compression element (4). ) The amount of oil taken into the oil separator (6) and discharged into the discharge line (5) increases, and even if the amount of oil separated in the oil separator (6) increases, the oil accumulated in the oil separator (6) will not exceed the specified curved surface. Once exceeded, this excess oil flows through the oil return passage (8) as well as the oil return line (
47) and the oil sump (1) via the suction line (20).
Therefore, it is possible to prevent the oil level from decreasing in the oil sump (1), ensure the amount of oil necessary for lubrication, and improve reliability.
又、前記油戻し通路（８）の減圧手段としてオリフィス
（９）を用いたから、オリフィスの特性上、その油量は
油の粘度のほぼ３分の１乗に比例して変化するのみで、
油の粘度即ち油温の変化による影響を受けに＜＜、安定
した油戻しが行えると共に、同じくオリフィスの特性上
、その通過流速がヘリウムの音速を越えることがないた
め、油分離器（６）の油面が低い場合にも、油戻し通Ｈ
（８）を介して吐出ガスが吸入側へバイパスする量を低
減することができる。Furthermore, since the orifice (9) is used as a pressure reducing means for the oil return passage (8), due to the characteristics of the orifice, the amount of oil changes only in proportion to approximately one third power of the viscosity of the oil.
The oil separator (6) allows for stable oil return without being affected by changes in oil viscosity, that is, oil temperature, and also because the flow rate through the orifice does not exceed the sonic speed of helium. Even when the oil level is low, the oil return
(8) The amount of discharged gas bypassed to the suction side can be reduced.
以上のものでは、油分離器（６）を１段だけ設けたが、
第２図に示すように、圧縮要素（４）の吐出ライン（５
）に、第１油分離器（６ａ）と第２油分離器（６ｂ）と
を直列に２段設けて、初段側の第１油分離器（６ａ）の
底部と前記圧縮要素（４）の油性入口（３）との間を、
油インジェクション通路（７）で接続すると共に、第１
油分離器（６ａ）の規定油面高さ位置に、油戻しライン
（４７）及び吸入ライン（２０）を介して油溜（１）に
連通ずる第１油戻し通路（８ａ）を、第２油分離器（６
ｂ）の底部に、同じく油戻しライン（４７）及び吸入ラ
イン（２０）を介して油溜（１）に連通ずる第２油戻し
通路（８ｂ）を各々開口させるようにしてもよい。In the above, only one stage of oil separator (6) was provided, but
As shown in FIG. 2, the discharge line (5) of the compression element (4)
), a first oil separator (6a) and a second oil separator (6b) are provided in two stages in series, and the bottom of the first oil separator (6a) on the first stage side and the compression element (4) Between the oil inlet (3)
It is connected through the oil injection passage (7) and the first
A first oil return passage (8a) communicating with the oil sump (1) via an oil return line (47) and a suction line (20) is connected to a specified oil level height position of the oil separator (6a), and a second Oil separator (6
b), a second oil return passage (8b) which communicates with the oil sump (1) via the oil return line (47) and suction line (20) may be respectively opened.
この場合には、第１油分離器（６ａ）で分離され、油イ
ンジェクシロン通路（７）を介して供給される油により
吐出ガスの冷却が行え、又、この第１油分離器（６ａ）
に過剰に溜る油及びこの第１油分離器（６ａ）では分離
されずに第２油分離器（６ｂ）で分離される油は、それ
ぞれ第１及び第２油戻し通路（８ａ） （８ｂ）を介
して油溜（１）に返すことができ、２段階の油分離及び
その油戻しにより、前記油溜（１）の油面を一層良好に
保つことができる。In this case, the discharged gas can be cooled by the oil separated by the first oil separator (6a) and supplied through the oil injection passage (7), and the first oil separator (6a)
The oil that accumulates in excess and the oil that is not separated in the first oil separator (6a) but is separated in the second oil separator (6b) are removed from the first and second oil return passages (8a) and (8b), respectively. The oil can be returned to the oil sump (1) through the oil sump (1), and the oil level in the oil sump (1) can be maintained even better by two-stage oil separation and oil return.
又、この第２図に示す構成で、第１油戻し通路（８ａ）
の減圧手段に、オリフィス（９）を、第２油戻し通路（
８ｂ）の減圧手段に、キャピラリーチューブ（１０）を
それぞれ用いる。In addition, with the configuration shown in FIG. 2, the first oil return passage (8a)
The orifice (9) is connected to the pressure reducing means of the second oil return passage (
A capillary tube (10) is used as the pressure reducing means in step 8b).
これによれば、第１油分離器（６ａ）から油溜（１）へ
の油戻しは、オリフィス（９）を介して行われるため、
油の粘度による影響を低減できると共に、吐出ガスのバ
イパス量を低減することができる。一方、第２油分離器
（６ｂ）では、第１油分離器（６ａ）で分離されなかっ
た油を分離するものでその戻し油量は本来的に少なく、
第２油戻し通路（８ｂ）には開口率の小さな減圧機構を
用いれば足り、この場合に、オリフィスではその穴径の
微小加工が困難であるのに対して、前記キャピラリーチ
ューブ（１０）を用いたため、該チューブ（１０）を小
径にすることによりその開口率を容易に小さくすること
ができ、このため、第２油分離器（６ｂ）と低圧側との
連通面積を縮小でき、該第２油分離器（６ｂ）からの吐
出ガスのバイパス量を低減することができる。尚、特性
的に、キャピラリーチューブでは、その油量が油の粘度
にほぼ比例して変化するため、オリフィスを用いた場合
に比べて温度による影響を受は易いが、第２油分離器（
６ｂ）から戻す油量は本来少ないため、これが問題とな
ることはない。According to this, since oil is returned from the first oil separator (6a) to the oil sump (1) via the orifice (9),
Not only can the influence of oil viscosity be reduced, but also the bypass amount of discharged gas can be reduced. On the other hand, the second oil separator (6b) separates the oil that was not separated in the first oil separator (6a), and the amount of returned oil is inherently small.
It is sufficient to use a pressure reducing mechanism with a small opening ratio for the second oil return passageway (8b). Therefore, by making the tube (10) small in diameter, its opening ratio can be easily reduced, and therefore, the communication area between the second oil separator (6b) and the low pressure side can be reduced, and the second oil separator (6b) can communicate with the low pressure side. The bypass amount of discharged gas from the oil separator (6b) can be reduced. In addition, in a capillary tube, the amount of oil changes almost in proportion to the viscosity of the oil, so it is more easily affected by temperature than in the case of using an orifice, but the second oil separator (
Since the amount of oil returned from 6b) is originally small, this does not pose a problem.
（発明の効果）
以上、本発明では、圧縮要素（４）の吐出ライン（５）
に油分離器（６）を設けて、この油分離器（６）の底部
と油性入口（３）との間を、油インジェクション通路（
７）で接続すると共に、前記油分離器（６）の規定油面
高さ位置に、油溜（１）に連通ずる油戻し通路（８）を
開口したから、吐出ガスの冷却が行えると共に、油溜（
１）の油面を適正に保つことができ、潤滑を保証できて
信頼性の向上を図ることができる。(Effects of the Invention) As described above, in the present invention, the discharge line (5) of the compression element (4)
An oil separator (6) is provided in the oil separator (6), and an oil injection passage (
7), and an oil return passage (8) communicating with the oil sump (1) is opened at a specified oil level height position of the oil separator (6), so that the discharged gas can be cooled. Oil sump (
1) The oil level can be maintained at an appropriate level, lubrication can be guaranteed, and reliability can be improved.
第２に、上記の構成で、油戻し通路（８）の減圧手段に
オリフィス（９）を用いたから、油溜（１）への油戻し
を油温に拘らず安定して行えると共に、油分離器（６）
から低圧側への吐出ガスのバイパス量を低減でき、性能
の低下を抑制することができる。Secondly, in the above configuration, since the orifice (9) is used as the pressure reducing means in the oil return passage (8), the oil can be returned to the oil sump (1) stably regardless of the oil temperature, and the oil can be separated. Vessel (6)
It is possible to reduce the bypass amount of the discharged gas from the to the low pressure side, and it is possible to suppress a decrease in performance.
第３に、圧縮要素（４）の吐出ライン（５）に第１及び
第２油分離器（６ａ） （８ｂ）を直列に設けて、初
段側の第１油分離器（６ａ）の底部と油性入口（３）と
の間を、油インジェクシ日ソ通路（７）で接続すると共
に、前記第１油分離器（６ａ）の規定油面高さ位置に、
油溜（１）に連通ずる第１油戻し通路（８ａ）を、又、
前記第２油分離器（６ｂ）の底部に、油溜（１）に連通
ずる第２油戻し通路（８ｂ）を各々開口したから、吐出
ガスの冷却が行えると共に、２段階の油分離及び油戻し
により、油溜（１）の油面を一層良好に保つことができ
る。Thirdly, the first and second oil separators (6a) (8b) are provided in series in the discharge line (5) of the compression element (4), and the bottom of the first oil separator (6a) on the first stage side Connected to the oil inlet (3) by an oil injector passage (7), and at a specified oil level height position of the first oil separator (6a),
A first oil return passage (8a) communicating with the oil sump (1),
Since second oil return passages (8b) communicating with the oil sump (1) are opened at the bottoms of the second oil separators (6b), the discharged gas can be cooled, and two-stage oil separation and oil By returning the oil, the oil level in the oil sump (1) can be maintained even better.
第４に、上記第３の構成で、第１油戻し通路（８ａ）の
減圧手段にオリフィス（９）を、第２油戻し通路（８ｂ
）の減圧手段にキャピラリーチューブ（１０）をそれぞ
れ用いたから、第１油分離器（６ａ）からの油戻しを油
温に拘らず安定して行えると共に、第１及び第２油分離
器（６ａ）（８ｂ）双方につき、吐出ガスのバイパス量
を低減することができる。Fourthly, in the third configuration, the orifice (9) is provided in the pressure reducing means of the first oil return passage (8a), and the orifice (9) is provided in the pressure reducing means of the first oil return passage (8a).
), the capillary tubes (10) are used as decompression means for the first oil separator (6a), so the oil can be returned stably from the first oil separator (6a) regardless of the oil temperature, and the oil can be returned from the first and second oil separators (6a) (8b) In both cases, the bypass amount of the discharged gas can be reduced.
第１図は本発明に係る圧縮装置の第１実施例を示す配管
構成図、第２図は同第２実施例を示す配管構成図、第３
図は従来例の断面図である。
（１）・・・・油溜
（２）・・・・ケーシング
（３）・・・・油性入口
（４）・・・・圧縮要素
（５）・・・・吐出ライン
（６）・・・・油分離器
（７）・・・・油インジェクシ日ン通路（８）・・・・
油戻し通路
（９）・・・・オリフィス
（１０）・・・・キャピラリーチューブ（６ａ）・・・
・第１油分離器
（６ｂ）・・・・第２油分離器
（８ａ）・・・・第１油戻し通路
（８ｂ）・・・・第２油戻し通路FIG. 1 is a piping configuration diagram showing a first embodiment of the compression device according to the present invention, FIG. 2 is a piping configuration diagram showing the second embodiment, and FIG.
The figure is a sectional view of a conventional example. (1) Oil sump (2) Casing (3) Oil inlet (4) Compression element (5) Discharge line (6)・Oil separator (7)...Oil injector passageway (8)...
Oil return passage (9)... Orifice (10)... Capillary tube (6a)...
・First oil separator (6b)...Second oil separator (8a)...First oil return passage (8b)...Second oil return passage
Claims (4)
グ（２）に、油性入口（３）をもつ圧縮要素（４）を内
装した極低温冷凍機の圧縮装置であって、前記圧縮要素
（４）の吐出ライン（５）に油分離器（６）を設けて、
この油分離器（６）の底部と前記油性入口（３）との間
を、油インジェクション通路（７）で接続すると共に、
前記油分離器（６）の規定油面高さ位置に、前記油溜（
１）に連通する油戻し通路（８）を開口したことを特徴
とする極低温冷凍機の圧縮装置。(1) A compression device for a cryogenic refrigerator comprising a compression element (4) having an oil inlet (3) inside a low-pressure dome-shaped casing (2) having an oil reservoir (1) at the bottom; providing an oil separator (6) in the discharge line (5) of the element (4);
Connecting the bottom of the oil separator (6) and the oil inlet (3) with an oil injection passage (7),
The oil sump (
1) A compression device for a cryogenic refrigerator, characterized in that an oil return passage (8) communicating with the oil return passageway (8) is opened.
）を用いている請求項１記載の極低温冷凍機の圧縮装置
。(2) An orifice (9) is installed in the pressure reducing means of the oil return passage (8).
) A compression device for a cryogenic refrigerator according to claim 1, wherein the compression device uses:
グ（２）に、油性入口（３）をもつ圧縮要素（４）を内
装した極低温冷凍機の圧縮装置であって、前記圧縮要素
（４）の吐出ライン（５）に第１及び第２油分離器（６
ａ）（６ｂ）を直列に設けて、初段側の第１油分離器（
６ａ）の底部と前記油性入口（３）との間を、油インジ
ェクション通路（７）で接続すると共に、前記第１油分
離器（６ａ）の規定油面高さ位置に、前記油溜（１）に
連通する第１油戻し通路（８ａ）を、又、前記第２油分
離器（６ｂ）の底部に、前記油溜（１）に連通する第２
油戻し通路（８ｂ）を各々開口したことを特徴とする極
低温冷凍機の圧縮装置。(3) A compression device for a cryogenic refrigerator comprising a compression element (4) having an oil inlet (3) in a low-pressure dome-shaped casing (2) having an oil reservoir (1) at the bottom, First and second oil separators (6) are installed in the discharge line (5) of the element (4).
a) (6b) are installed in series, and the first oil separator (
6a) and the oil inlet (3) are connected by an oil injection passage (7), and the oil sump (1) is connected at a specified oil level height position of the first oil separator (6a). ), and a second oil return passageway (8a) communicating with the oil sump (1) at the bottom of the second oil separator (6b).
A compression device for a cryogenic refrigerator, characterized in that each oil return passage (8b) is opened.
ス（９）を、第２油戻し通路（８ｂ）の減圧手段に、キ
ャピラリーチューブ（１０）をそれぞれ用いている請求
項３記載の極低温冷凍機の圧縮装置。(4) The orifice (9) is used as the pressure reducing means of the first oil return passage (8a), and the capillary tube (10) is used as the pressure reduction means of the second oil return passage (8b). Compression equipment for cryogenic refrigerators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2156556A JP2518455B2 (en) | 1990-06-14 | 1990-06-14 | Compressor for cryogenic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2156556A JP2518455B2 (en) | 1990-06-14 | 1990-06-14 | Compressor for cryogenic refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0447192A true JPH0447192A (en) | 1992-02-17 |
| JP2518455B2 JP2518455B2 (en) | 1996-07-24 |
Family
ID=15630379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2156556A Expired - Fee Related JP2518455B2 (en) | 1990-06-14 | 1990-06-14 | Compressor for cryogenic refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2518455B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006291861A (en) * | 2005-04-12 | 2006-10-26 | Hitachi Ltd | Displacement compressor |
| JP2011038461A (en) * | 2009-08-10 | 2011-02-24 | Hitachi Appliances Inc | Hermetic compressor and air-cooled helium compression equipment |
| JP2012247134A (en) * | 2011-05-27 | 2012-12-13 | Sanyo Electric Co Ltd | Cryogenic refrigerator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6444393U (en) * | 1987-09-11 | 1989-03-16 |
-
1990
- 1990-06-14 JP JP2156556A patent/JP2518455B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6444393U (en) * | 1987-09-11 | 1989-03-16 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006291861A (en) * | 2005-04-12 | 2006-10-26 | Hitachi Ltd | Displacement compressor |
| JP2011038461A (en) * | 2009-08-10 | 2011-02-24 | Hitachi Appliances Inc | Hermetic compressor and air-cooled helium compression equipment |
| JP2012247134A (en) * | 2011-05-27 | 2012-12-13 | Sanyo Electric Co Ltd | Cryogenic refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2518455B2 (en) | 1996-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7674099B2 (en) | Compressor with oil bypass | |
| US8187370B2 (en) | Horizontal bulk oil separator | |
| CN104315738B (en) | Refrigerating device | |
| US5094598A (en) | Capacity controllable compressor apparatus | |
| JPH0116350B2 (en) | ||
| CN111076453A (en) | Gas bearing gas supply system for compressor, operation method and refrigeration system | |
| JPH0447192A (en) | Compression device for extremely low temperature refrigerator | |
| JP2005076902A (en) | Compression unit for refrigerator | |
| JP2002276578A (en) | Rotary type multi-stage compressor | |
| JP2568711B2 (en) | Gas compressor | |
| JP2924269B2 (en) | Cryogenic refrigerator compressor | |
| CN111895682B (en) | Air-cooled heat pump system adopting single-unit two-stage hybrid screw compressor | |
| CN216894891U (en) | Helium compressor with oil cooling motor coil function | |
| CN217481539U (en) | Compressor oil return structure, compressor and air conditioner | |
| CN111921233B (en) | Oil way degassing system | |
| JP2022543544A (en) | Helium compressor system with unmodified scroll compressor | |
| JPH0648287Y2 (en) | Gas compression unit | |
| CN217354756U (en) | Working condition control system applied to double-screw compressor | |
| JP2766719B2 (en) | Gas compression unit | |
| CN114046247A (en) | Helium compressor with oil cooling motor coil function | |
| CN217107421U (en) | Oil lubrication helium compressor with air return cooling function | |
| RU2231689C2 (en) | Oil system of gas turbocompressor | |
| JP3278927B2 (en) | Helium refrigerator | |
| JP3065080B2 (en) | Scroll gas compressor | |
| JPH09100786A (en) | Scroll gas compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080517 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090517 Year of fee payment: 13 |
|
| LAPS | Cancellation because of no payment of annual fees |