JPH0720521Y2 - Cryogenic refrigerator - Google Patents
Cryogenic refrigeratorInfo
- Publication number
- JPH0720521Y2 JPH0720521Y2 JP12935088U JP12935088U JPH0720521Y2 JP H0720521 Y2 JPH0720521 Y2 JP H0720521Y2 JP 12935088 U JP12935088 U JP 12935088U JP 12935088 U JP12935088 U JP 12935088U JP H0720521 Y2 JPH0720521 Y2 JP H0720521Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- low
- pipe
- pressure pipe
- compressor
- 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.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Pipeline Systems (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Description
【考案の詳細な説明】 （イ）産業上の利用分野 この考案は低圧側の圧力を調整する弁を備えた極低温用
冷凍装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an improvement of a cryogenic refrigeration system provided with a valve for adjusting the pressure on the low pressure side.
（ロ）従来の技術 従来の極低温用冷凍装置は例えば、実公昭52−9638号公
報に示されているように構成されている。ここで、この
公報を参考に従来例を説明する。第２図において、50,5
1は圧縮機および圧力調整弁、52,53は圧縮機50の電源に
連動する自動弁、54はフィルタからなる高圧機器、55は
極低温膨張機、56,57は復帰路およびガスホルダであ
る。(B) Prior Art A conventional cryogenic refrigeration system is constructed, for example, as shown in Japanese Utility Model Publication No. 52-9638. Here, a conventional example will be described with reference to this publication. In Figure 2, 50,5
Reference numeral 1 is a compressor and a pressure control valve, 52 and 53 are automatic valves that are interlocked with the power source of the compressor 50, 54 is a high-pressure device including a filter, 55 is a cryogenic expander, and 56 and 57 are return paths and gas holders.
この構造の極低温用冷凍装置では圧縮機50で圧縮された
作動流体を圧力調整弁51で復帰路56に戻して極低温膨張
機55に供給する作動流体の圧力を調整した後、自動弁5
2、高圧機器54および自動弁53を通って極低温膨張機55
で寒冷を作るとともに、停止時に自動弁52,53を閉じて
高圧機器54内の作動流体を高圧状態でこの高圧機器内に
封じ込めるようにしている。In the cryogenic refrigeration system of this structure, the working fluid compressed by the compressor 50 is returned to the return path 56 by the pressure regulating valve 51 and the pressure of the working fluid supplied to the cryogenic expander 55 is adjusted, and then the automatic valve 5
2, cryogenic expander 55 through high pressure equipment 54 and automatic valve 53
While making cold, the automatic valves 52 and 53 are closed at the time of stop so that the working fluid in the high-pressure equipment 54 is contained in the high-pressure equipment in a high pressure state.
（ハ）考案が解決しようとする課題 しかしながら、圧力調整弁51は圧縮された作動流体の高
圧圧力のみを調整しているため、圧縮機50に復帰路56を
介して戻る作動流体の低圧圧力が調整できず、この低圧
圧力が極端に低くなった場合に、低圧側が負圧になり空
気が冷凍装置内に入り込み、低温膨張機内で固化して運
転が不安定になったり、冷凍能力が低下する問題があっ
た。(C) Problem to be Solved by the Invention However, since the pressure regulating valve 51 regulates only the high pressure of the compressed working fluid, the low pressure pressure of the working fluid returned to the compressor 50 via the return path 56 is reduced. If this pressure cannot be adjusted and this low pressure becomes extremely low, the low pressure side becomes negative pressure and air enters the refrigeration system, solidifies in the low temperature expander and becomes unstable in operation, or the refrigeration capacity decreases. There was a problem.
この考案は上記の問題を解決するもので、圧縮機に戻る
作動流体の低圧圧力を設定圧力以上に保持して冷凍能力
を向上させると共に運転を安定させることを目的とした
ものである。This invention solves the above-mentioned problems, and aims to maintain the low pressure of the working fluid returning to the compressor above a set pressure to improve the refrigerating capacity and stabilize the operation.
（ニ）課題を解決するための手段 この考案は圧縮機と、極低温膨張機と、これらの圧縮機
と極低温膨張機との間に夫々接続された吸気弁を有する
高圧管及び排気弁を有する低圧管と、圧縮機と並列に高
圧管と低圧管とに接続されたバイパス管とで構成し、こ
のバイパス管には高圧管内の圧力と低圧管内の圧力との
差が設定圧以上になったときに高圧管側から低圧管側に
向って作動流体の流れを許容する差圧調整弁が設けられ
ている極低温用冷凍装置において、高圧管と低圧管とに
は低圧管内の圧力を設定圧以上に保持する低圧調整弁を
差圧調整弁に並列に配管接続したものである。(D) Means for Solving the Problems This invention includes a compressor, a cryogenic expander, and a high pressure pipe and an exhaust valve each having an intake valve connected between the compressor and the cryogenic expander. It consists of a low-pressure pipe and a bypass pipe connected to the high-pressure pipe and the low-pressure pipe in parallel with the compressor. In this bypass pipe, the difference between the pressure in the high-pressure pipe and the pressure in the low-pressure pipe exceeds the set pressure. In a cryogenic refrigeration system equipped with a differential pressure regulating valve that allows the flow of working fluid from the high-pressure pipe side to the low-pressure pipe side, the pressure inside the low-pressure pipe is set for the high-pressure pipe and the low-pressure pipe. A low-pressure regulating valve that holds pressure above the pressure is connected in parallel to the differential pressure regulating valve by piping.
（ホ）作用 この考案は上記のように構成したことにより、圧縮機の
高圧側の高圧管と低圧側の低圧管とを連通するバイパス
管に差圧調整弁を設け、この差圧調整弁に並列に設けた
低圧調整弁で高圧管内の作動流体を、低圧管内の圧力が
設定圧力以上に保持されるように低圧管内に戻し、圧縮
機の冷凍能力を向上させるとともに、安定した運転が行
なわれるようにしたものである。(E) Action This invention is configured as described above, and thus a differential pressure adjusting valve is provided in the bypass pipe that connects the high pressure side high pressure pipe and the low pressure side low pressure pipe of the compressor. The low-pressure regulating valves provided in parallel return the working fluid in the high-pressure pipe back into the low-pressure pipe so that the pressure in the low-pressure pipe is maintained above the set pressure, improving the refrigerating capacity of the compressor and performing stable operation. It was done like this.
（ヘ）実施例 以下この考案を第１図に示す実施例に基いて説明する。(F) Embodiment Hereinafter, the present invention will be described based on an embodiment shown in FIG.
１は作動流体を圧縮する圧縮機、２はオイルセパレー
タ、３は油粒子を吸着するアドソーバ、４は極低温膨張
機、５はアキュームレータである。そして、圧縮機１と
極低温膨張機４との間には、オイルセパレータ２とアド
ソーバ３を介して高圧管６が接続されている。極低温膨
張機４の入口側の高圧管６には吸気弁７が設けられてい
る。極低温膨張機４と圧縮機１との間にはアキュームレ
ータ５を介して低圧管８が接続されている。極低温膨張
機４の出口側の低圧管８には排気弁９が設けられてい
る。10はオイルセパレータ２とアドソーバ３との間の高
圧管６と、アキュームレータ５と圧縮機１との間の低圧
管８とに接続されるバイパス管で、このバイパス管には
設定圧以上の差圧で動作する差圧調整弁11が設けられて
いる。12は差圧調整弁11に並列に設けた低圧調整弁で、
この低圧調整弁はバイパス管10に接続され、低圧管８内
の圧力が設定圧力よりも低くなると、高圧管６から低圧
管８へ向って作動流体を流すようにしている。1 is a compressor for compressing a working fluid, 2 is an oil separator, 3 is an adsorber for adsorbing oil particles, 4 is a cryogenic expander, and 5 is an accumulator. A high pressure pipe 6 is connected between the compressor 1 and the cryogenic expander 4 via an oil separator 2 and an adsorber 3. An intake valve 7 is provided in the high pressure pipe 6 on the inlet side of the cryogenic expander 4. A low pressure pipe 8 is connected between the cryogenic expander 4 and the compressor 1 via an accumulator 5. An exhaust valve 9 is provided in the low pressure pipe 8 on the outlet side of the cryogenic expander 4. Reference numeral 10 is a bypass pipe connected to a high pressure pipe 6 between the oil separator 2 and the adsorber 3 and a low pressure pipe 8 between the accumulator 5 and the compressor 1. A differential pressure regulating valve 11 that operates in accordance with 1. is provided. 12 is a low pressure adjusting valve provided in parallel with the differential pressure adjusting valve 11,
This low-pressure regulating valve is connected to the bypass pipe 10 so that when the pressure in the low-pressure pipe 8 becomes lower than the set pressure, the working fluid flows from the high-pressure pipe 6 to the low-pressure pipe 8.
このように構成された極低温用冷凍装置において、圧縮
機１で圧縮された作動流体はオイルセパレータ２内で内
部に含まれているオイルを分離されている。この分離さ
れたオイルは圧縮機１に戻される。また、オイルセパレ
ータ２から流出した作動流体はアドソーバ３を通過する
際に、このオイルセパレータで分離しきれなかった油粒
子をアドソーバ３で吸着させてオイルが十分に除去され
るようにしている。アドソーバ３を出た作動流体は吸気
弁７が開放しているとき、極低温膨張機４に入って膨張
して寒冷を発生している。また、寒冷を発生した作動流
体は排気弁９が開放することにより、極低温膨張機４内
で熱交換して外気温度と略同等になってアキュームレー
タ５を介して圧縮機１に帰還するようにしている。吸気
弁７と排気弁９とは交互に開閉して作動流体を極低温膨
張機４に高圧管６側から流入して低圧管８側へ流出させ
るようにしている。In the cryogenic refrigeration system thus configured, the working fluid compressed by the compressor 1 is separated from the oil contained inside the oil separator 2. The separated oil is returned to the compressor 1. Further, when the working fluid flowing out from the oil separator 2 passes through the adsorber 3, the adsorber 3 adsorbs oil particles that have not been separated by the oil separator, so that the oil is sufficiently removed. The working fluid discharged from the adsorber 3 enters the cryogenic expander 4 and expands when the intake valve 7 is open to generate cold. Further, the working fluid that has generated cold is exchanged with heat in the cryogenic expander 4 by opening the exhaust valve 9 so that it becomes substantially equal to the outside air temperature and is returned to the compressor 1 via the accumulator 5. ing. The intake valve 7 and the exhaust valve 9 are alternately opened and closed so that the working fluid flows into the cryogenic expander 4 from the high pressure pipe 6 side and flows out to the low pressure pipe 8 side.
バイパス管10に設けられた差圧調整弁11は高圧管６内の
作動流体の圧力と、低圧管８内の作動流体の圧力との差
圧が設定以上になると開放し、高圧管６内の作動流体を
低圧管８に戻すことにより、圧縮機１の高圧側と低圧側
との差圧を常に一定圧力以下に保持するようにしてい
る。また、差圧調整弁11に並列に設けられた低圧調整弁
12は低圧管８内の作動流体の圧力が設定圧力以下になる
と開放し、高圧管６内の作動流体を低圧管８に戻すこと
により、この低圧管内の圧力を設定圧力以上に保持する
ようにしている。そのため、この考案は低圧管８内の圧
力が低くなるのを防止され、冷凍能力が低下するのを防
止されるとともに、連続運転が継続され、装置の一時停
止によって、極低温膨張機が急激に温度上昇するのを防
止できるようにしている。The differential pressure adjusting valve 11 provided in the bypass pipe 10 is opened when the pressure difference between the pressure of the working fluid in the high pressure pipe 6 and the pressure of the working fluid in the low pressure pipe 8 becomes equal to or more than a set value, and By returning the working fluid to the low-pressure pipe 8, the differential pressure between the high-pressure side and the low-pressure side of the compressor 1 is always kept below a certain pressure. In addition, a low pressure adjustment valve provided in parallel with the differential pressure adjustment valve 11.
12 is opened when the pressure of the working fluid in the low-pressure pipe 8 becomes equal to or lower than the set pressure, and the working fluid in the high-pressure pipe 6 is returned to the low-pressure pipe 8 so that the pressure in the low-pressure pipe is maintained above the set pressure. ing. Therefore, according to this invention, the pressure in the low-pressure pipe 8 is prevented from being lowered, the refrigerating capacity is prevented from being lowered, the continuous operation is continued, and the cryogenic expander is suddenly abruptly stopped by temporarily stopping the device. It is designed to prevent the temperature from rising.
（ト）考案の効果 この考案の極低温用冷凍装置は圧縮機と、極低温膨張機
と、これらの圧縮機と極低温膨張機との間に夫々接続さ
れた吸気弁を有する高圧管及び排気弁を有する低圧管
と、これらの高圧管と低圧管とに圧縮機と並列に接続さ
れたバイパス管、このバイパス管に設けられた差圧調整
弁とを備え、この差圧調整弁に並列に低圧管内の圧力を
設定圧力以上に保持する低圧調整弁を接続したものであ
るから、低圧管内の圧力が設定圧力以下になったとき
に、低圧調整弁を開放して高圧管内の作動流体を低圧管
内に供給することによって、この低圧管内の圧力を設定
圧力以上に保持でき、低圧管内の圧力が負圧になること
を回避して、空気が冷凍装置内に入ることを防止し、運
転を安定することができ、かつ冷凍能力が低下するのを
防止できる。しかも、高圧側と低圧側との圧力差を一定
圧力以下に保持するとともに、低圧側の圧力を一定圧力
以上に保持することにより、圧縮機の連続運転が継続で
き、装置の一時停止に基く極低温膨張機の温度上昇によ
る障害を回避できるものである。(G) Effect of the Invention The cryogenic refrigeration system of the invention is a compressor, a cryogenic expander, a high pressure pipe having an intake valve connected between the compressor and the cryogenic expander, and an exhaust gas. A low pressure pipe having a valve, a high pressure pipe and a low pressure pipe, a bypass pipe connected in parallel with the compressor, and a differential pressure adjusting valve provided in the bypass pipe. Since a low-pressure regulating valve that keeps the pressure in the low-pressure pipe above the set pressure is connected, when the pressure in the low-pressure pipe falls below the set pressure, the low-pressure regulating valve is opened to reduce the working fluid in the high-pressure pipe to a low pressure. By supplying into the pipe, the pressure in the low-pressure pipe can be maintained above the set pressure, avoiding negative pressure in the low-pressure pipe, preventing air from entering the refrigeration system, and stabilizing operation. And prevent the refrigeration capacity from decreasing. it can. Moreover, by keeping the pressure difference between the high-pressure side and the low-pressure side below a certain pressure, and by keeping the pressure on the low-side pressure above a certain pressure, continuous operation of the compressor can be continued, and the polarity based on temporary suspension of the device It is possible to avoid the obstacle caused by the temperature rise of the low temperature expander.
第１図はこの考案の一実施例を示す極低温用冷凍装置の
冷却回路図、第２図は従来例を示す冷却回路図である。 １…圧縮機、４…極低温膨張機、６…高圧管、７…吸気
弁、８…低圧管、９…排気弁、10…バイパス管、11…差
圧調整弁、12…低圧調整弁。FIG. 1 is a cooling circuit diagram of a cryogenic refrigerating apparatus showing an embodiment of the present invention, and FIG. 2 is a cooling circuit diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Compressor, 4 ... Cryogenic expander, 6 ... High pressure pipe, 7 ... Intake valve, 8 ... Low pressure pipe, 9 ... Exhaust valve, 10 ... Bypass pipe, 11 ... Differential pressure regulating valve, 12 ... Low pressure regulating valve.
Claims (1)
で圧縮された作動流体を膨張させて寒冷を生じさせる極
低温膨張機と、圧縮機と極低温膨張機との間に吸気弁を
有して接続された高圧管と、極低温膨張機と圧縮機との
間に排気弁を有して接続された低圧管と、圧縮機に並列
に高圧管と低圧管とに接続されたバイパス管とで構成
し、このバイパス管には高圧管内の圧力と低圧管内の圧
力との差圧が設定圧以上になったときに高圧管側から低
圧管側に向って作動流体の流れを許容する差圧調整弁が
設けられている極低温用冷凍装置において、高圧管と低
圧管とには低圧管内の圧力を設定圧力以上に保持する低
圧調整弁が差圧調整弁に並列に配管接続されていること
を特徴とする極低温用冷凍装置。1. A compressor for compressing a working fluid, a cryogenic expander for expanding the working fluid compressed by the compressor to produce cold, and an intake valve between the compressor and the cryogenic expander. And a low pressure pipe connected with an exhaust valve between the cryogenic expander and the compressor, and a high pressure pipe and a low pressure pipe connected in parallel to the compressor. It consists of a bypass pipe, and allows the working fluid to flow from the high-pressure pipe side to the low-pressure pipe side when the differential pressure between the pressure in the high-pressure pipe and the pressure in the low-pressure pipe exceeds the set pressure. In a cryogenic refrigeration system equipped with a differential pressure regulating valve, a low pressure regulating valve that holds the pressure inside the low pressure pipe above a set pressure is connected in parallel to the high pressure pipe and the low pressure pipe. A cryogenic refrigeration system characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12935088U JPH0720521Y2 (en) | 1988-09-30 | 1988-09-30 | Cryogenic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12935088U JPH0720521Y2 (en) | 1988-09-30 | 1988-09-30 | Cryogenic refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0252061U JPH0252061U (en) | 1990-04-13 |
| JPH0720521Y2 true JPH0720521Y2 (en) | 1995-05-15 |
Family
ID=31383548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12935088U Expired - Lifetime JPH0720521Y2 (en) | 1988-09-30 | 1988-09-30 | Cryogenic refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0720521Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6975066B2 (en) * | 2018-02-20 | 2021-12-01 | 住友重機械工業株式会社 | Cryogenic freezer |
-
1988
- 1988-09-30 JP JP12935088U patent/JPH0720521Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0252061U (en) | 1990-04-13 |
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