JPH037856A - Cryo-expansion device - Google Patents

Cryo-expansion device

Info

Publication number
JPH037856A
JPH037856A JP14243889A JP14243889A JPH037856A JP H037856 A JPH037856 A JP H037856A JP 14243889 A JP14243889 A JP 14243889A JP 14243889 A JP14243889 A JP 14243889A JP H037856 A JPH037856 A JP H037856A
Authority
JP
Japan
Prior art keywords
cylinder
piston
sliding
thermal conductivity
sliding part
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.)
Pending
Application number
JP14243889A
Other languages
Japanese (ja)
Inventor
Hiroyuki Morishita
森下 弘之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP14243889A priority Critical patent/JPH037856A/en
Publication of JPH037856A publication Critical patent/JPH037856A/en
Pending legal-status Critical Current

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  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

PURPOSE:To restrict a temperature rise of sliding heat of a piston ring and to reduce an amount of wear of the sliding part by a method wherein the sliding part of the piston ring of a piston is provided with a cylindrical liner composed of material having a high thermal conductivity. CONSTITUTION:Sliding parts of each of piston rings 5 and 5, i.e., inner surface of a cylinder 1 are provided with a cylindrical liner 12 composed of material having high thermal conductivity such as aluminum or copper or the like. This liner 12 is formed such that a separate member is press fitted or installed at the inner surface of the cylinder 1 through adhesion or formed to a predetermined thickness at the inner surface of the cylinder 1 through plating or vapor deposition or the like. Each of the piston rings 5 and 5 of a slacking piston 2 and a displacing element 3 is reciprocated and slid at the inner surface of the cylinder 1. A sliding heat generated by this operation is released in a longitudinal direction through the cylindrical liner 12, so that a temperature at the sliding part can be prevented from being increased. Accordingly, even if the cylinder 1 is made of stainless steel having a low thermal conductivity in order to prevent a thermal entrance from a surrounding releasing part to a heating stage 11, it is possible to reduce an amount of wear at the sliding part.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、超電導マグネ−/ )等の冷却に使用される
絶対温度数十に程度の極低温を得る極低温膨張機に関す
る。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cryogenic expander that obtains cryogenic temperatures of several tens of degrees in absolute temperature, which is used for cooling superconducting magnets, etc.

(従来の技術) 従来、実開昭62−28088号公報に開示され、かつ
、第2図に示すように、ヘリウム等の高圧ガスの導入と
低圧ガスの排気とが繰り返されるシリンダ(S)の内部
にピストン(P)を内装し、このピストン(P)を、外
周部に嵌合したピストンリング(R)を介して前記シリ
ンダ(P)の内面に往復摺動させ、シリンダ(S)の端
部膨張空間に隣接して設けるヒートステージに極低温を
得るようにしている。
(Prior Art) Conventionally, as disclosed in Japanese Utility Model Application Publication No. 62-28088, and as shown in FIG. A piston (P) is installed inside, and this piston (P) is slid back and forth on the inner surface of the cylinder (P) via a piston ring (R) fitted to the outer circumference, and the end of the cylinder (S) is An extremely low temperature is obtained in the heat stage provided adjacent to the partial expansion space.

(発明が解決しようとする課題) ところで、この種膨張機では、極低温とされるヒートス
テージ周りを真空室に収容し、大気開放側からヒートス
テージに熱が侵入するのを阻止するため、シリンダ(S
)は熱伝導率の低いステンレス等で形成するのが一般的
である。
(Problem to be Solved by the Invention) In this type of expander, the area around the heat stage, which is said to be at an extremely low temperature, is housed in a vacuum chamber, and in order to prevent heat from entering the heat stage from the side open to the atmosphere, the cylinder (S
) is generally made of stainless steel, etc., which has low thermal conductivity.

しかし、シリンダ(S)を熱伝導率の低い材料で形成す
ることは、一方では、ピストンリング(R)とシリンダ
(S)の壁面間に生じる摺動熱を逃げにくくすることに
なるから、摺動部分が高温になり、摩耗量が大きくなる
問題が起こる。このため、通常、定期的にピストンリン
グ(R)の交換を行う必要が生じるが、早期摩耗により
メンテナンス間隔が短期間となり、ランニングコストが
かさむ問題がある。しかも、この種膨張機は、医療用磁
気画像処理装置等に組込まれる超電導マグネット等を冷
却するという特殊な使命を担うことも多いため、運転中
断が容易に行えない事情もある。
However, forming the cylinder (S) from a material with low thermal conductivity makes it difficult for the sliding heat generated between the piston ring (R) and the cylinder (S) to escape. The problem arises that the moving parts become hot and the amount of wear increases. For this reason, it is usually necessary to periodically replace the piston ring (R), but there is a problem in that early wear shortens the maintenance interval and increases running costs. Moreover, this type of expander often has a special mission of cooling superconducting magnets and the like that are incorporated into medical magnetic image processing apparatuses and the like, so there are circumstances in which it is difficult to interrupt the operation.

本発明の目的は、熱侵入の弊害を防止できながら、ピス
トンリング部分で生じる摺動熱を逃がして摺動部分の温
度を低減し、摺動摩耗量の低減により、メンテナンス間
隔を長期間にできる極低そこで、高圧ガスの導入と低圧
ガスの排気とが繰り返されるシリンダ(1)にピストン
(4)を内装し、このピストン(4)を、外周部に嵌合
したピストンリング(5)を介して前記シリンダ(1)
の内面に往復摺動させるようにした極低温膨張機におい
て、前記シリンダ(1)の内面であって前記ピストンリ
ング(5)の摺動部に、高熱伝導率材料から成る筒形ラ
イナー(12)を介装することにした。
The purpose of the present invention is to reduce the temperature of the sliding part by releasing the sliding heat generated in the piston ring part while preventing the harmful effects of heat intrusion, and by reducing the amount of sliding wear, it is possible to extend the maintenance interval for a long time. Therefore, a piston (4) is installed inside a cylinder (1) in which high-pressure gas is introduced and low-pressure gas is exhausted repeatedly, and this piston (4) is connected via a piston ring (5) fitted to the outer periphery. The cylinder (1)
In the cryogenic expander, a cylindrical liner (12) made of a high thermal conductivity material is provided on the inner surface of the cylinder (1) and on the sliding part of the piston ring (5). I decided to intervene.

(作用) シリンダ(1)の内面に、ピストン(4)のピストンリ
ング(5)が往復摺動する際に発生する摺動熱は、高熱
伝導率材料とした筒形ライナー(12)を介して逃げる
ため、摺動部分の温度上昇を抑制でき、シリンダ(1)
を熱伝導率の低いステンレスで形成する場合にも、摺動
部分の摩耗nを低減でき、メンテナンス間隔が長期化で
きるのである。
(Function) The sliding heat generated when the piston ring (5) of the piston (4) reciprocates on the inner surface of the cylinder (1) is transferred through the cylindrical liner (12) made of a high thermal conductivity material. Because it escapes, the temperature rise of the sliding part can be suppressed, and the cylinder (1)
Even when it is made of stainless steel, which has low thermal conductivity, the wear n of the sliding parts can be reduced and the maintenance interval can be extended.

(実施例) 第1図に示すものは、ステンレス製のシリンダ(1)の
内部に、スラックピストン(2)とディスプレーサ(3
)とから成るピストン(4)を、テフロン樹脂製のピス
トンリング(5)(5)を介して摺動自由に内装し、シ
リンダ(1)への高圧ガスの導入と低圧ガスの排気とを
繰り返し行うと共に、ピストン(4)をシリンダ(1)
内で往復動させて、シリンダ(1)の下部の膨張空間(
10)に隣接するヒートステージ(11)に極低温を得
るようにしたものである。
(Example) The one shown in Fig. 1 has a slack piston (2) and a displacer (3) inside a stainless steel cylinder (1).
) is freely slidable inside the piston (4) through Teflon resin piston rings (5) (5), and repeatedly introduces high pressure gas into the cylinder (1) and exhausts low pressure gas. At the same time, insert the piston (4) into the cylinder (1).
The expansion space at the bottom of the cylinder (1) is
10), the heat stage (11) adjacent to the heat stage (11) is provided with an extremely low temperature.

ディスプレーサ(3)の内部には、銅や鉛等の蓄冷器(
30)を内装していると共に、上部には、スラックピス
トン(2)に係合する連動ピン(31)を設けている。
Inside the displacer (3), there is a regenerator (made of copper, lead, etc.).
30), and an interlocking pin (31) that engages with the slack piston (2) is provided at the top.

又、シリンダ(1)のヒートステージ側は真空容器(1
00)の内部に収容している。
In addition, the heat stage side of the cylinder (1) is equipped with a vacuum container (1).
00).

そして、前記シリンダ(1)の内面であって前記各ピス
トンリング(5)(5)の摺動部に、アルミや銅等の高
熱伝導率材料から成る筒形ライナー(12)を介装する
。このライナー(12)は別部材のものをシリンダ(1
)の内面に圧入又は接着等により介装する他、シリンダ
(1)の内面にメツキや蒸着等により所定厚みに形成す
るようにしてもよい。
A cylindrical liner (12) made of a material with high thermal conductivity such as aluminum or copper is interposed on the inner surface of the cylinder (1) at the sliding portion of each piston ring (5) (5). This liner (12) is a separate member from the cylinder (12).
) may be inserted into the inner surface of the cylinder (1) by press-fitting or adhesion, or may be formed to a predetermined thickness by plating, vapor deposition, etc. on the inner surface of the cylinder (1).

前記シリンダ(1)の内部に通じる導排出通路(6)に
は、高圧開閉弁(71)及び低圧開閉弁(72)から成
る切換弁装置(7)を介して、ヘリウム圧縮ユニット(
8)から延びる高圧ガス管(81)と低圧ガス管(82
)とを接続しており、又、前記シリンダ(1)の上部室
(13)は、キャピラリー(14)を介して前記導排出
通路(6)に接続すると共に可変ブリード(15)を介
して前記低圧ガス管(82)に接続しており、該上部室
(13)の内部を中間圧力に保持するようにしている。
A helium compression unit (
A high pressure gas pipe (81) and a low pressure gas pipe (82) extending from
), and the upper chamber (13) of the cylinder (1) is connected to the introduction/discharge passage (6) via a capillary (14), and the upper chamber (13) of the cylinder (1) is connected via a variable bleed (15) to the It is connected to a low pressure gas pipe (82) to maintain the inside of the upper chamber (13) at an intermediate pressure.

切換弁装置(7)を構成する高圧及び低圧開閉弁(71
)(72)は可逆的な開閉を繰り返し行うように制御さ
れる。
High-pressure and low-pressure on-off valves (71) constituting the switching valve device (7)
) (72) is controlled to repeatedly open and close reversibly.

以上の構成で、高圧開閉弁(71)が開かれると、高圧
ガスは、ディスプレーサ(3)に内装した蓄冷器(30
)に流入すると共に、スラックピストン(2)に設ける
連通孔(20)を通って作用室(21)に流入する。そ
して、スラックピストン(2)は作用室(21)と上部
室(13)との差圧で上動し、やや時間遅れを伴って、
連動ビン(31)によりディスプレーサ(3)は引き上
げられ、膨張空間(10)に高圧ガスが充満される。こ
のとき、前回の排気行程(欠配)で冷却された蓄冷器(
30)に高圧ガスが通過しながら膨張空間(10)に導
入されるため、ヒートステージ(11)が冷却されるこ
とになる。次に、高圧開閉弁(71)が閉じて低圧開閉
弁(72)が開かれると、膨張空間(10)の高圧ガス
は、膨張しながら排出されると共に、作用室(21)の
圧力低下でスラックピストン(2)が押し下げられ、や
や時間遅れを伴ってディスプレーサ(3)も押し下げら
れて膨張空間(10)のガスは強制的に排出される。こ
の排気行程時の膨張作用で蓄冷器(30)の温度が次第
に低下されることになる。
With the above configuration, when the high pressure on-off valve (71) is opened, the high pressure gas is transferred to the regenerator (30) installed in the displacer (3).
), and also flows into the action chamber (21) through the communication hole (20) provided in the slack piston (2). Then, the slack piston (2) moves upward due to the pressure difference between the action chamber (21) and the upper chamber (13), and with a slight time delay,
The displacer (3) is pulled up by the interlocking bottle (31) and the expansion space (10) is filled with high pressure gas. At this time, the regenerator (
Since the high pressure gas is introduced into the expansion space (10) while passing through the heat stage (11), the heat stage (11) is cooled. Next, when the high-pressure on-off valve (71) is closed and the low-pressure on-off valve (72) is opened, the high-pressure gas in the expansion space (10) is discharged while expanding, and the pressure in the action chamber (21) is reduced. The slack piston (2) is pushed down, and with a slight delay, the displacer (3) is also pushed down, and the gas in the expansion space (10) is forcibly discharged. The temperature of the regenerator (30) gradually decreases due to the expansion action during this exhaust stroke.

以上の行程を繰り返し行うことにより、ヒートステージ
(10)は数十に程度の極低温に冷却されるのであり、
そしてこの時、シリンダ(1)の内面に、スラックピス
トン(2)及びディスプレーサ(3)の各ピストンリン
グ(5)(5)が往復摺動されることになるが、この摺
動に伴い発生する摺動熱は、高熱伝導率材料とした筒形
ライナー(12)を介してシリンダ(1)の長さ方向に
逃げるため、摺動部分の温度上昇を抑制できる。従って
、ヒートステージ(11)への大気開放側からの熱侵入
を阻止すべく、シリンダ(1)を熱伝導率の低いステン
レスで形成したにも拘わらず、摺動部分の摩耗量を低減
でき、メンテナンス間隔が長期化でき、ランニングコス
トの低減を図れると共に、運転の中断回数を減らせて、
医療等の特殊用途での使用の利便も図れるのである。
By repeating the above process, the heat stage (10) is cooled to an extremely low temperature of several tens of degrees.
At this time, the piston rings (5) (5) of the slack piston (2) and the displacer (3) will slide back and forth on the inner surface of the cylinder (1), but this sliding will cause problems to occur. Since the sliding heat escapes in the length direction of the cylinder (1) via the cylindrical liner (12) made of a material with high thermal conductivity, it is possible to suppress the temperature rise in the sliding portion. Therefore, even though the cylinder (1) is made of stainless steel with low thermal conductivity in order to prevent heat from entering the heat stage (11) from the atmosphere-opening side, the amount of wear on the sliding parts can be reduced. Maintenance intervals can be extended, running costs can be reduced, and the number of interruptions in operation can be reduced.
It can also be conveniently used for special purposes such as medical care.

又、摺動部分に発生する熱を低減化できるため、ディス
プレーサ(3)等を高速で往復動させることも可能にな
り、高能力化等への対応も図れる利点が得られるのであ
る。
Furthermore, since the heat generated in the sliding parts can be reduced, it becomes possible to reciprocate the displacer (3) and the like at high speed, which provides the advantage of being able to accommodate higher performance.

以上の実施例では、ディスプレーサ(3)を1段とし、
ヒートステージ(11)を1段としたものを示したが、
2段以上のディスプレーサをもち、ヒートステージを2
段以上としたものでも同様に適用できるのは云うまでも
ない。
In the above embodiment, the displacer (3) is one stage,
Although the one with one heat stage (11) is shown,
Has two or more displacers and two heat stages.
Needless to say, it can be applied in the same way even if the number of stages is higher than that.

(発明の効果) 以上本発明によれば、シリンダ(1)の内面であってピ
ストン(4)のピストンリング(5)の摺動部に高熱伝
導率材料から成る筒形ライナー(12)を介装したから
、ピストンリング(5)の摺動熱によるの温度上昇を抑
制でき、熱侵入を阻止すべくシリンダ(1)を熱伝導率
の低いステンレスで形成する場合にも、摺動部分の摩耗
量を低減でき、メンテナンス間隔が長期化でき、ランニ
ングコストの低減を図れると共に、運転の中断回数を減
らせて、医療等の特殊用途での使用の利便も図れるので
ある。
(Effects of the Invention) According to the present invention, a cylindrical liner (12) made of a high thermal conductivity material is provided on the inner surface of the cylinder (1) and on the sliding part of the piston ring (5) of the piston (4). Because of this, it is possible to suppress the temperature rise due to sliding heat of the piston ring (5), and even when the cylinder (1) is made of stainless steel with low thermal conductivity to prevent heat intrusion, wear of the sliding part can be suppressed. This makes it possible to reduce the amount of use, lengthen maintenance intervals, reduce running costs, and reduce the number of interruptions in operation, making it more convenient to use for special purposes such as medical care.

又、摺動部に発生する熱を低減できるため、ピストン(
4)を高速駆動することが可能になり、高能力化等への
対応も図れるのである。
In addition, since the heat generated in the sliding parts can be reduced, the piston (
4) can be driven at high speed, making it possible to respond to higher performance requirements.

【図面の簡単な説明】 第1図は本発明極低温膨張機の断面図、第2図は従来例
の断面図である。 (1)・・・・シリンダ (4)・・・・ピストン (5)・・・・ピストンリング (12)・・・・筒形ライナー 第1図
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of the cryogenic expander of the present invention, and FIG. 2 is a sectional view of a conventional example. (1)...Cylinder (4)...Piston (5)...Piston ring (12)...Cylindrical liner Fig. 1

Claims (1)

【特許請求の範囲】[Claims] 1)高圧ガスの導入と低圧ガスの排気とが繰り返される
シリンダ(1)にピストン(4)を内装し、このピスト
ン(4)を、外周部に嵌合したピストンリング(5)を
介して前記シリンダ(1)の内面に往復摺動させるよう
にした極低温膨張機において、前記シリンダ(1)の内
面であって前記ピストンリング(5)の摺動部に、高熱
伝導率材料から成る筒形ライナー(12)を介装したこ
とを特徴とする極低温膨張機。
1) A piston (4) is installed inside a cylinder (1) in which high-pressure gas is introduced and low-pressure gas is exhausted repeatedly, and this piston (4) is In a cryogenic expansion machine configured to reciprocate and slide on the inner surface of a cylinder (1), a cylindrical shape made of a high thermal conductivity material is installed on the inner surface of the cylinder (1) and on the sliding part of the piston ring (5). A cryogenic expansion machine characterized by being equipped with a liner (12).
JP14243889A 1989-06-05 1989-06-05 Cryo-expansion device Pending JPH037856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14243889A JPH037856A (en) 1989-06-05 1989-06-05 Cryo-expansion device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14243889A JPH037856A (en) 1989-06-05 1989-06-05 Cryo-expansion device

Publications (1)

Publication Number Publication Date
JPH037856A true JPH037856A (en) 1991-01-16

Family

ID=15315319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14243889A Pending JPH037856A (en) 1989-06-05 1989-06-05 Cryo-expansion device

Country Status (1)

Country Link
JP (1) JPH037856A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085621A (en) * 2005-09-21 2007-04-05 Noritz Corp Fluid control device
JP2009287569A (en) * 2009-09-07 2009-12-10 Mitsubishi Heavy Ind Ltd Piston ring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085621A (en) * 2005-09-21 2007-04-05 Noritz Corp Fluid control device
JP2009287569A (en) * 2009-09-07 2009-12-10 Mitsubishi Heavy Ind Ltd Piston ring

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