JPS61236968A - Piston - Google Patents
PistonInfo
- Publication number
- JPS61236968A JPS61236968A JP7636885A JP7636885A JPS61236968A JP S61236968 A JPS61236968 A JP S61236968A JP 7636885 A JP7636885 A JP 7636885A JP 7636885 A JP7636885 A JP 7636885A JP S61236968 A JPS61236968 A JP S61236968A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- machined
- temperature
- moisture
- phenol resin
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/01—Pistons; Trunk pistons; Plungers characterised by the use of particular materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Compressor (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、ピストンｔこ係り、特に極低温冷凍装置の往
復動式膨張機に使用さｎるピストンｔこ関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to pistons, particularly to pistons used in reciprocating expanders of cryogenic refrigeration equipment.
極低温冷凍装置の往復動式膨張機でのピストンは、シリ
ンダ室内への熱侵入量を減少させるため断熱性の高いプ
ラスチック材料で形成されている。A piston in a reciprocating expander of a cryogenic refrigeration system is made of a highly insulating plastic material in order to reduce the amount of heat entering the cylinder chamber.
（例えば、中釜、 クロードサイクル＠緻小形冷凍機１
、低温°工学協会冷凍部会講習会資料、昭和５５年９月
１２日や松原、Ｃｒｙｏｅｌｅｃｔｒｏｎｉｃｓの冷凍
システム」、低温工学、Ｖｏｌ、１５９階］。(For example, medium boiler, Claude cycle @ compact refrigerator 1
, Cryogenic Engineering Association Refrigeration Subcommittee Seminar Materials, September 12, 1980, Ya Matsubara, "Refrigerating Systems of Cryoelectronics", Cryogenic Engineering, Vol. 159].
１９８０年）
しかし、フェノール樹脂やナイロン等の断熱性の高いプ
ラスチック材料で形成されたピストンは。(1980) However, pistons made of highly insulating plastic materials such as phenolic resin and nylon.
温度や温度の変化によりステンレス鋼等金属材料で形成
さｎたピストンの１０倍以上にも及ぶ寸法変化や曲りの
発生が見られる。ピストンが２のように変形しても円滑
な運転を継続させるためには予めピストンの変形量を見
込んでピストンとシリンダのすきまを拡げておかなけ１
ばならず、寒冷損失が増大するという問題があった。一
方、寒冷損失を防止するためには運転中のピストンの変
形を減少させなけｎばならないが、このためには高温で
のアニーリングや、常温と低温の間でのヒートサイクル
試＠を加えるなど複雑な処理を必要とするという問題が
あった。Due to temperature changes, dimensional changes and bending occur more than 10 times as much as pistons made of metal materials such as stainless steel. In order to continue smooth operation even if the piston is deformed as shown in 2, the gap between the piston and cylinder must be increased in advance to account for the amount of piston deformation 1
However, there was a problem of increased cooling loss. On the other hand, in order to prevent cooling loss, it is necessary to reduce the deformation of the piston during operation, but this requires complicated methods such as annealing at high temperatures and adding heat cycle tests between room temperature and low temperature. The problem was that it required extensive processing.
本発明の目的は、アニーリング処理等の複雑な処理を施
こすことなしに温度や湿度の変化による変形を抑制でき
るピストン？提供することにある。The purpose of the present invention is to create a piston that can suppress deformation due to changes in temperature and humidity without performing complicated treatments such as annealing treatment. It is about providing.
未
、本発明は、断熱性の高いプラスチック材料と糸布とを
積層した積層材料をピストンの形状に加工した後に、該
加工表面にプラスチック材料の被膜を形成したことを特
徴とするもので、アニーリング処理等の複雑な処理を施
こすことなしに温度や湿度の変化によるピストンの変形
を抑制しようとしたものである。The present invention is characterized in that after a laminated material made by laminating a highly insulating plastic material and thread cloth is processed into the shape of a piston, a film of the plastic material is formed on the processed surface, and annealing is performed. This is an attempt to suppress the deformation of the piston due to changes in temperature and humidity without performing complicated treatments.
本発明の一実施例を第１図〜第４図により説明する。 An embodiment of the present invention will be described with reference to FIGS. 1 to 4.
第】因で１作動ガス、例えば、ヘリウムガスの紛中排気
と同期してシリンダーｏの内部をピストン２０が往復動
する。ガス人口−】から供給さｎた高圧のヘリウムガス
は、シリンダ内室１２で膨張することにより寒冷を発生
し、その後、ガス排出口】３から排出さする。ここで、
寒冷が高温側のシＩＪ ン’ｆ外室］ ４の方へ逃げる
のを防ぐためには、シールリング】５を設けるだけでは
なく、シリンダーＯとピストン２０とのす＃まを出来る
限り小さくすることが必要である。Therefore, the piston 20 reciprocates inside the cylinder o in synchronization with the exhaust of a working gas, for example, helium gas. The high-pressure helium gas supplied from the gas port 12 expands in the cylinder interior 12 to generate cold air, and is then discharged from the gas outlet 3. here,
In order to prevent cold air from escaping toward the high temperature side of the cylinder (outer chamber), it is necessary not only to provide a seal ring (5) but also to make the space between the cylinder O and the piston 20 as small as possible. is necessary.
第２図、第３図（第２図のＡ−人視断面図）で。In FIGS. 2 and 3 (A-human sectional view in FIG. 2).
プラスチック材料、例えば、フェノール樹脂２１本
とｐ布２２とを、この場合、同心円状１こ交互に積ｍｔ
＝たＭ層材料２３は、まず、所要のピストン精度を確保
するために、この場合、機械加工される。In this case, 21 pieces of plastic material, such as phenolic resin, and 22 pieces of P cloth are stacked alternately in concentric circles mt
The M-layer material 23 is first machined in this case to ensure the required piston accuracy.
夫
この機械加工のため、基布２２が加工表面に露出ピスト
ンの寸法が変化する。尚、この場合、積層材料２３自体
が方向性のないもので曲りが少ないためピストンの曲り
も少ない。そこで、ピストンの寸法変化を抑制するため
、第４図に示すように機械加工表面には１例えば、フェ
ノール樹脂系ｌニスが厚さ５〜３０μｍ塗布さｊ、る。Due to this machining, the dimensions of the piston change, with the base fabric 22 exposed on the machined surface. In this case, since the laminated material 23 itself has no directionality and bends less, the piston also bends less. Therefore, in order to suppress the dimensional change of the piston, the machined surface is coated with, for example, phenol resin varnish to a thickness of 5 to 30 μm, as shown in FIG.
その後、温度８０〜１００℃で約１時間乾燥させること
で１機械加工表面には、堅固で吸湿性の低い被膜２４が
形成される。Thereafter, by drying at a temperature of 80 to 100° C. for about 1 hour, a hard coating 24 with low hygroscopicity is formed on the machined surface.
第２図に示すようＣ機械加工したままのものでは、吸湿
率が１％にも及ぶのに対し第４図に示すように被膜２４
を形成したものでは、吸湿率が０゜１％以下であり、そ
の結果５寸法の変化が小さくなる。As shown in Fig. 2, the moisture absorption rate is as high as 1% in the C-machined product, whereas as shown in Fig. 4, the coating 24
The moisture absorption rate is 0.1% or less, and as a result, the change in the five dimensions is small.
本実施例では、方向性めない積層材料でピストンを形成
し、機械加工表面に被膜を形成しているため、温度や湿
度の変化によるピストンの変形ヲア二−リング処理等の
複雑な処理を施こすことなく抑制することができる。In this example, the piston is formed from a laminated material with no directionality, and a coating is formed on the machined surface, so complex treatments such as annealing for deformation of the piston due to changes in temperature and humidity are performed. It can be suppressed without rubbing.
尚、積層材料の形状は、棒状であっても中空管状であっ
ても良い。又、ピストンの胴体部分に中空管状の積層材
料を、ピストンの端板部分に平板状の積層材料を使用し
１両者をねじで結當した後に被膜を形成するようｔこし
ても良い。１ξ被膜の厚さが不均一になったり、厚すぎ
るようになった場ｅｓｃは、それらを矯正するように被
膜表面を機械加工しても良い。Note that the shape of the laminated material may be rod-like or hollow-tubular. Alternatively, a hollow tubular laminated material may be used for the body portion of the piston, and a flat laminated material may be used for the end plate portion of the piston, and the coating may be formed after the two are tied together with screws. If the thickness of the 1ξ coating becomes uneven or too thick, the surface of the coating may be machined to correct it.
本発明は１以上説明したように、アニーリング処理等の
複雑な処理を施こすことなしに温度や湿度の変化による
ピストンの変形を抑制できるという効果がある。As described above, the present invention has the effect of suppressing deformation of the piston due to changes in temperature and humidity without performing complicated treatments such as annealing treatment.
第】図は、本発明によるピストンの一実施例を示す往復
動式の膨張機のシリンダ部の長手方向断面図、第２−〜
第４図は、第１図のピストンの加工過程を示す断面図で
ある。
２０・・・・・・ピストン、２３・・・・・・積層材料
、２４・・・・・・（ｌＩＩｌ！Fig. 2 is a longitudinal sectional view of a cylinder portion of a reciprocating expander showing an embodiment of a piston according to the present invention;
FIG. 4 is a cross-sectional view showing the machining process of the piston shown in FIG. 1. 20... Piston, 23... Laminated material, 24... (lIIl!
Claims (1)
積層材料をピストンの形状に加工した後に、該加工表面
にプラスチック材料の被膜を形成したことを特徴とする
ピストン。1. A piston characterized in that a laminated material made by laminating a highly insulating plastic material and thread cloth is processed into the shape of a piston, and then a film of plastic material is formed on the processed surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7636885A JPS61236968A (en) | 1985-04-12 | 1985-04-12 | Piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7636885A JPS61236968A (en) | 1985-04-12 | 1985-04-12 | Piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61236968A true JPS61236968A (en) | 1986-10-22 |
Family
ID=13603400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7636885A Pending JPS61236968A (en) | 1985-04-12 | 1985-04-12 | Piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61236968A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353462A1 (en) * | 1988-07-21 | 1990-02-07 | Elring Dichtungswerke GmbH | Pistons, particularly plunger pistons for compressors |
| JPH02282297A (en) * | 1989-04-24 | 1990-11-19 | Kawai Musical Instr Mfg Co Ltd | Parameter signal forming device |
| JPH0343167U (en) * | 1989-09-05 | 1991-04-23 | ||
| JP2008064115A (en) * | 1997-09-24 | 2008-03-21 | Hitachi Ltd | Reciprocating type compressor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5962772A (en) * | 1982-09-29 | 1984-04-10 | Nissin Kogyo Kk | Plastic piston for disc brake |
-
1985
- 1985-04-12 JP JP7636885A patent/JPS61236968A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5962772A (en) * | 1982-09-29 | 1984-04-10 | Nissin Kogyo Kk | Plastic piston for disc brake |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353462A1 (en) * | 1988-07-21 | 1990-02-07 | Elring Dichtungswerke GmbH | Pistons, particularly plunger pistons for compressors |
| JPH02282297A (en) * | 1989-04-24 | 1990-11-19 | Kawai Musical Instr Mfg Co Ltd | Parameter signal forming device |
| JPH0343167U (en) * | 1989-09-05 | 1991-04-23 | ||
| JP2008064115A (en) * | 1997-09-24 | 2008-03-21 | Hitachi Ltd | Reciprocating type compressor |
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