JPH0655944B2 - Refrigerant composition - Google Patents
Refrigerant compositionInfo
- Publication number
- JPH0655944B2 JPH0655944B2 JP2067527A JP6752790A JPH0655944B2 JP H0655944 B2 JPH0655944 B2 JP H0655944B2 JP 2067527 A JP2067527 A JP 2067527A JP 6752790 A JP6752790 A JP 6752790A JP H0655944 B2 JPH0655944 B2 JP H0655944B2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- intermediate heat
- heat exchanger
- weight
- evaporator
- 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 - Fee Related
Links
- 239000003507 refrigerant Substances 0.000 title claims description 38
- 239000000203 mixture Substances 0.000 title claims description 8
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 claims description 21
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 claims description 6
- UMNKXPULIDJLSU-UHFFFAOYSA-N dichlorofluoromethane Chemical compound FC(Cl)Cl UMNKXPULIDJLSU-UHFFFAOYSA-N 0.000 claims description 4
- 229940099364 dichlorofluoromethane Drugs 0.000 claims description 4
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 description 13
- 238000009835 boiling Methods 0.000 description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- RJCQBQGAPKAMLL-UHFFFAOYSA-N bromotrifluoromethane Chemical compound FC(F)(F)Br RJCQBQGAPKAMLL-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 description 1
- 239000010725 compressor oil Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明は、非共沸混合冷媒を用いる超低温冷凍装置に好
適であり、且つ、オゾン層を破壊する危険性がない冷媒
組成物に関する。TECHNICAL FIELD The present invention relates to a refrigerant composition suitable for an ultra-low temperature refrigerating apparatus using a non-azeotropic mixed refrigerant and having no risk of destroying the ozone layer.
（ロ）従来の技術 従来、非共沸混合冷媒を用いる冷凍装置は、より沸点の
高い冷媒の蒸発と最終段の蒸発器からの低温帰還冷媒に
よって、より沸点の低い冷媒を順次凝縮して行くことに
より、最終段において最も沸点の低い冷媒を蒸発させて
超低温を得ている。この様な冷凍装置に用いられている
混合冷媒はジクロロフルオロメタン（ＣＨＣｌ２Ｆ、Ｒ
２１）と、ブロモトリフルオロメタン（ＣＢｒＦ３、Ｒ
１３Ｂ１）と、テトラフルオロメタン（ＣＦ４、Ｒ１
４）とから構成されていた。(B) Conventional technology In a conventional refrigeration system using a non-azeotropic mixed refrigerant, the refrigerant having a lower boiling point is sequentially condensed by the evaporation of the refrigerant having a higher boiling point and the low-temperature return refrigerant from the evaporator at the final stage. As a result, the refrigerant having the lowest boiling point is evaporated in the final stage to obtain an ultralow temperature. The mixed refrigerant used in such a refrigeration system is dichlorofluoromethane (CHCl 2 F, R
21) and bromotrifluoromethane (CBrF 3 , R
13B1) and tetrafluoromethane (CF 4 , R1
4) and.
各冷媒の沸点はそれぞれ大気圧においてＲ２１は＋８．
９５℃、Ｒ１３Ｂ１は−５７．７５℃、Ｒ１４は−１２
７．８５℃であり、複数の気液分離器と中間熱交換器を
用い、第１段の中間熱交換器においてＲ２１を蒸発させ
てＲ１３Ｂ１を凝縮し、第２段の中間熱交換器において
Ｒ１３Ｂ１を蒸発させてＲ１４を凝縮して、このＲ１４
を最終段の蒸発器にて蒸発させるとにより−８０乃至−
９０℃の超低温を得ている。The boiling point of each refrigerant is +8.
95 ° C, R13B1 is -57.75 ° C, R14 is -12
7.85 ° C., using a plurality of gas-liquid separators and an intermediate heat exchanger, R21 is evaporated in the first stage intermediate heat exchanger to condense R13B1, and R13B1 is used in the second stage intermediate heat exchanger. R14 is condensed to condense R14
-80 to-
An ultra low temperature of 90 ° C is obtained.
上記Ｒ２１はＲ１３Ｂ１を凝縮する役目を果たすがそれ
以外に冷凍装置中の圧縮機オイルをそれに溶け込ませた
状態で圧縮機に帰還せしめる働きをする。The R21 plays a role of condensing the R13B1 but otherwise functions to return the compressor oil in the refrigeration system to the compressor in a state of being dissolved therein.
（ハ）発明が解決しようとする課題 然し乍ら上記冷媒の内、Ｒ１３Ｂ１は地球のオゾン層を
破壊する恐れがあるため、その使用が不可能となって来
たため、オゾン層を破壊する危険性のない冷媒による非
共沸混合冷媒の開発が要望されていた。(C) Problems to be Solved by the Invention However, among the above-mentioned refrigerants, R13B1 may destroy the ozone layer of the earth, and since it has become impossible to use it, there is no danger of destroying the ozone layer. There has been a demand for the development of a non-azeotropic mixed refrigerant using a refrigerant.
本発明は、係る課題を解決することを目的とする。The present invention aims to solve such problems.
（ニ）課題を解決するための手段 請求項１の発明は、ジクロロフルオロメタン（Ｒ２１）
と、クロロジフルオロメタン（ＣＨＣｌＣＦ２、Ｒ２
２）と、トリフルオロメタン（ＣＨＦ３、Ｒ２３）及び
テトラフルオロメタン（Ｒ１４）とから冷媒組成物を構
成したものである。(D) Means for Solving the Problems The invention of claim 1 provides dichlorofluoromethane (R21)
And chlorodifluoromethane (CHClCF 2 , R2
2) and trifluoromethane (CHF 3 , R23) and tetrafluoromethane (R14) to form a refrigerant composition.
請求項２の発明は上記において、Ｒ２１を５０乃至６５
重量％、Ｒ２２を４乃至１４重量％、Ｒ２３を１０乃至
２１重量％、Ｒ１４を１３乃至２４重量％としたもので
ある。According to the invention of claim 2, R21 is 50 to 65 in the above.
%, R22 is 4 to 14% by weight, R23 is 10 to 21% by weight, and R14 is 13 to 24% by weight.
（ホ）作用 本発明のいずれの冷媒もオゾン層を破壊する危険性はな
い。また、Ｒ２２の沸点は大気圧において−４０．７５
℃であり、Ｒ２３は−８２．０５℃であり、最終段の蒸
発器からの帰還冷媒と、Ｒ２２の蒸発によってＲ２３及
びＲ１４を順次凝縮して行って、最終段の蒸発器にてＲ
１４を蒸発させることができる。(E) Action None of the refrigerants of the present invention has a risk of destroying the ozone layer. The boiling point of R22 is −40.75 at atmospheric pressure.
And R23 is −82.05 ° C., and R23 and R14 are sequentially condensed by evaporation of R22 and the return refrigerant from the evaporator of the final stage, and then R23 is evaporated in the evaporator of the final stage.
14 can be evaporated.
特に、実験によればＲ２１を５０乃至６５重量％、Ｒ２
２を４乃至１４重量％、Ｒ２３を１０乃至２１重量％、
Ｒ１４を１３乃至２４重量％とすることにより最終段の
蒸発器において−９０℃以下の超低温が得られた。Especially, according to the experiment, R21 is 50 to 65% by weight, R2 is
2 to 4 to 14% by weight, R23 to 10 to 21% by weight,
By setting R14 to 13 to 24% by weight, an ultralow temperature of -90 ° C or lower was obtained in the final stage evaporator.
（ヘ）実施例 次に図面において実施例を説明する。図面はＲ２１、Ｒ
２２、Ｒ２３及びＲ１４から成る非共沸混合冷媒を用い
た場合の冷媒回路を示している。(F) Example Next, an example will be described with reference to the drawings. Drawing is R21, R
The refrigerant circuit when a non-azeotropic mixed refrigerant composed of 22, R23 and R14 is used is shown.
圧縮機１の吐出側配管２は凝縮器３を通過し、フレーム
パイプ２０を通り圧縮機１のオイルクーラー４に接続さ
れる。オイルクーラー４を出た配管は再び凝縮器３を通
過して第１の気液分離器５に接続されている。第１の気
液分離器５から出た液相配管６は第１のキャピラリチュ
ーブ７に接続され、第１のキャピラリチューブ７は第１
の中間熱交換器８に接続される。第１の気液分離器５か
ら出た気相配管９は第１の中間熱交換器８中を通過して
第２の気液分離器１０に接続されている。The discharge side pipe 2 of the compressor 1 passes through the condenser 3, passes through the frame pipe 20, and is connected to the oil cooler 4 of the compressor 1. The pipe exiting the oil cooler 4 passes through the condenser 3 again and is connected to the first gas-liquid separator 5. The liquid phase pipe 6 coming out of the first gas-liquid separator 5 is connected to the first capillary tube 7, and the first capillary tube 7 is the first capillary tube 7.
Connected to the intermediate heat exchanger 8. The gas-phase pipe 9 exiting from the first gas-liquid separator 5 passes through the first intermediate heat exchanger 8 and is connected to the second gas-liquid separator 10.
第２の気液分離器１０から出た液相配管１１は第２のキ
ャピラリチューブ１２に接続され、第２のキャピラリチ
ューブ１２は第２の中間熱交換器１３に接続される。第
２の気液分離器１０から出た気相配管１４は第２の中間
熱交換器１３及び第３の中間熱交換器１５中を順次通過
して第３のキャピラリチューブ１６に接続され、第３の
キャピラリチューブ１６は蒸発器１７に接続される。蒸
発器１７から出た配管１８は第３の中間熱交換器１５に
接続され、第３の中間熱交換器は第２の中間熱交換器１
３に接続されると共に、第２の中間熱交換器１３は第１
の中間熱交換器８に順次接続され、第１の中間熱交換器
８は圧縮機１の吸込側配管１９に接続される。The liquid phase pipe 11 coming out of the second gas-liquid separator 10 is connected to the second capillary tube 12, and the second capillary tube 12 is connected to the second intermediate heat exchanger 13. The gas-phase pipe 14 exiting from the second gas-liquid separator 10 sequentially passes through the second intermediate heat exchanger 13 and the third intermediate heat exchanger 15 and is connected to the third capillary tube 16. The capillary tube 16 of No. 3 is connected to the evaporator 17. The pipe 18 exiting from the evaporator 17 is connected to the third intermediate heat exchanger 15, and the third intermediate heat exchanger is the second intermediate heat exchanger 1.
The second intermediate heat exchanger 13 is connected to the first
Are sequentially connected to the intermediate heat exchanger 8 and the first intermediate heat exchanger 8 is connected to the suction side pipe 19 of the compressor 1.
この冷媒回路内にはＲ２１、Ｒ２２、Ｒ２３及びＲ１４
から成る非共沸混合冷媒が充填される。各冷媒の沸点は
大気圧において、Ｒ２１が＋８．９５℃、Ｒ２２が−４
０．７５℃、Ｒ２３が−８２．０５℃、Ｒ１４が−１２
７．８５℃である。また、実施例で使用する各冷媒の組
成はＲ２１が６２重量％、Ｒ２２が６重量％、Ｒ２３が
１６重量％、Ｒ１４が１６重量％とした。In this refrigerant circuit R21, R22, R23 and R14
Is filled with a non-azeotropic mixed refrigerant. The boiling points of the refrigerants are + 8.95 ° C. for R21 and −4 for R22 at atmospheric pressure.
0.75 ° C, R23 is -82.05 ° C, R14 is -12
7.85 ° C. The composition of each refrigerant used in the examples was 62% by weight for R21, 6% by weight for R22, 16% by weight for R23, and 16% by weight for R14.
次に動作を説明する。圧縮機１から吐出された高温高圧
のガス状混合冷媒は凝縮器３に流入して放熱し、オリル
クーラー４で圧縮機１の潤滑オイルを冷却して、再び凝
縮器３で放熱し、その内のＲ２１及びＲ２２の大部分は
液化して第１の気液分離器５に入る。そこで液状のＲ２
１とＲ２２は液相配管６へ、また、未だ気体のＲ２２の
残りとＲ２３及びＲ１４は気相配管９へと分離される。
液相配管６に流入したＲ２１とＲ２２は第１のキャピラ
リチューブ７にて減圧されて第１の中間熱交換器８に流
入し、そこで蒸発する。第１の中間熱交換器８には蒸発
器１７からの帰還冷媒が流入しているので、その温度は
−１５．８℃程になっている。Next, the operation will be described. The high-temperature and high-pressure gaseous mixed refrigerant discharged from the compressor 1 flows into the condenser 3 to radiate heat, the lubricating oil of the compressor 1 is cooled by the Orill cooler 4, and the condenser 3 radiates heat again. Most of R21 and R22 are liquefied and enter the first gas-liquid separator 5. So liquid R2
1 and R22 are separated into the liquid phase pipe 6, and the remaining gas R22 and R23 and R14 are separated into the gas phase pipe 9.
R21 and R22 that have flowed into the liquid phase pipe 6 are decompressed by the first capillary tube 7, flow into the first intermediate heat exchanger 8, and evaporate there. Since the return refrigerant from the evaporator 17 flows into the first intermediate heat exchanger 8, its temperature is about -15.8 ° C.
一方、気相配管９に流入したＲ２２、Ｒ２３及びＲ１４
の中のＲ２２及びＲ２３の一部分は第２の中間熱交換器
８内を通過する過程で、そこで蒸発するＲ２１とＲ２２
及び蒸発器１７からの帰還冷媒により冷却されて凝縮液
化して第２の気液分離器１０に入る。そこで液状のＲ２
２とＲ２３は液相配管１１へ、また、未だ気体のＲ２３
の残りとＲ１４は気相配管１４へと分離される。液相配
管１１に流入したＲ２２とＲ２３は第２のキャピラリチ
ューブ１２にて減圧されて第２の中間熱交換器１３に流
入し、そこで蒸発する。第２の中間熱交換器１３には蒸
発器１７からの帰還冷媒が流入しているので、その温度
は−４７．３℃程になっている。On the other hand, R22, R23 and R14 which have flowed into the vapor phase pipe 9
Part of R22 and R23 in the process of passing through the inside of the second intermediate heat exchanger 8, R21 and R22 which evaporate there.
And, it is cooled by the return refrigerant from the evaporator 17, condensed and liquefied, and enters the second gas-liquid separator 10. So liquid R2
2 and R23 to the liquid phase pipe 11 and R23 which is still gas
The rest of R and R14 are separated into the vapor phase pipe 14. R22 and R23 that have flowed into the liquid phase pipe 11 are decompressed by the second capillary tube 12, flow into the second intermediate heat exchanger 13, and evaporate there. Since the return refrigerant from the evaporator 17 flows into the second intermediate heat exchanger 13, its temperature is about -47.3 ° C.
他方、気相配管１４に流入したＲ２３及びＲ１４の中の
Ｒ２３は第２の中間熱交換器１３内を通過する過程で、
そこで蒸発するＲ２２とＲ２３及び蒸発器１７からの帰
還冷媒により冷却されて凝縮液化し、次に第３の中間熱
交換器１５を通過する。ここで、第３の中間熱交換器１
５は蒸発器１７を出てすぐの冷媒が流入しており、温度
は−７０．３℃程になっている。従って、気相配管１４
を流れるＲ１４もここで凝縮し、これら液化したＲ２３
及びＲ１４は第３のキャピラリチューブ１６で減圧され
て蒸発器１７に流入し、そこで蒸発して周囲を冷却す
る。この時蒸発器１７の温度は−９６．３℃程の超低温
になった。この蒸発器１７を例えば冷凍庫の庫内の冷却
に用いることにより庫内を−９４．３℃程に冷却でき
た。On the other hand, R23 flowing into the gas-phase pipe 14 and R23 in R14 pass through the second intermediate heat exchanger 13,
There, it is cooled by the vaporized R22 and R23 and the return refrigerant from the evaporator 17, condensed and liquefied, and then passes through the third intermediate heat exchanger 15. Here, the third intermediate heat exchanger 1
Refrigerant 5 immediately after exiting the evaporator 17 is flowing in, and the temperature is about -70.3 ° C. Therefore, the gas phase piping 14
R14 flowing in the liquid also condenses here and these liquefied R23
R14 and R14 are decompressed by the third capillary tube 16 and flow into the evaporator 17, where they evaporate and cool the surroundings. At this time, the temperature of the evaporator 17 became an ultra-low temperature of about -96.3 ° C. By using the evaporator 17 for cooling the inside of the freezer, for example, the inside of the freezer can be cooled to about -94.3 ° C.
蒸発器１７を出た冷媒は各中間熱交換器１５、１３、８
に次々に流入してそこで蒸発する冷媒を合流して吸込配
管１９より圧縮機１に帰還する。The refrigerant exiting the evaporator 17 is transferred to the intermediate heat exchangers 15, 13, 8
The refrigerant that flows in one after another and evaporates there is merged and returned to the compressor 1 through the suction pipe 19.
冷媒回路中を循環する圧縮機１のオイルはＲ２１に溶け
込んだ状態で圧縮機１に戻される。又、Ｒ２１は圧縮機
１の吐出温度を下げる役割も果たしている。The oil of the compressor 1 circulating in the refrigerant circuit is returned to the compressor 1 in a state of being dissolved in R21. R21 also plays a role of lowering the discharge temperature of the compressor 1.
これら各冷媒の組成は実施例に限られるものではない。
即ち、実験によりＲ２１を５０〜６５重量％、Ｒ２２を
４〜１４重量％、Ｒ２３を１０〜２１重量％、Ｒ１４を
１３〜２４重量％の範囲内で混合することにより蒸発器
１７において−９０℃以下の超低温が得られることが確
かめられた。The composition of each of these refrigerants is not limited to the examples.
That is, by experiment, R21 was mixed in an amount of 50 to 65% by weight, R22 in an amount of 4 to 14% by weight, R23 in an amount of 10 to 21% by weight, and R14 in an amount of 13 to 24% by weight. It was confirmed that the following ultra-low temperature was obtained.
尚、上記混合冷媒においてＲ２３の代わりにＲ１３（ク
ロロトリフルオロメタン、ＣＣｌＦ３、沸点−８１．３
５℃）を使用しても同様の超低温は得られるが、Ｒ１３
はオゾン層を破壊する危険性があるので実用的ではな
い。Instead of R23 in the mixture refrigerant R13 (chlorotrifluoromethane, CClF 3, boiling point -81.3
The same ultra low temperature can be obtained by using
Is not practical because it has a risk of destroying the ozone layer.
（ト）発明の効果 本発明によれば、いずれの冷媒もオゾン層を破壊する危
険性はない。また、冷凍装置に適用することにより、最
終段の蒸発器からの帰還冷媒と、Ｒ２２やＲ２３の蒸発
によってＲ２３やＲ１４を順次凝縮して行って、最終段
の蒸発器にてＲ１４を蒸発させることができ、所望の超
低温を達成することができる。(G) Effect of the Invention According to the present invention, there is no risk that any refrigerant will destroy the ozone layer. Further, by applying to a refrigerating device, R23 and R14 are sequentially condensed by evaporation of R22 and R23, and the return refrigerant from the final-stage evaporator, and R14 is evaporated in the final-stage evaporator. The desired ultra-low temperature can be achieved.
特に、Ｒ２１を５０乃至６５重量％、Ｒ２２を４乃至１
４重量％、Ｒ２３を１０乃至２１重量％、Ｒ１４を１３
乃至２４重量％とすることにより最終段の蒸発器におい
て円滑に所望の超低温が得られる。Particularly, R21 is 50 to 65% by weight and R22 is 4 to 1
4 wt%, R23 10 to 21 wt%, R14 13
By setting the content to 24% by weight, the desired ultra-low temperature can be smoothly obtained in the final stage evaporator.
図面は冷媒回路図である。 １……圧縮機、５、１０……第１及び第２の気液分離
器、７、１２、１６……第１、第２及び第３のキャピラ
リチューブ、８、１３、１５……第１、第２及び第３の
中間熱交換器、１７……蒸発器。The drawing is a refrigerant circuit diagram. 1 ... Compressor, 5, 10 ... First and second gas-liquid separators, 7, 12, 16 ... First, second and third capillary tubes, 8, 13, 15 ... First , Second and third intermediate heat exchangers, 17 ... Evaporator.
Claims (2)
ロメタンとトリフルオロメタン及びテトラフルオロメタ
ンから成る冷媒組成物。1. A refrigerant composition comprising dichlorofluoromethane, chlorodifluoromethane, trifluoromethane and tetrafluoromethane.
量％、クロロジフルオロメタンが４乃至１４重量％、ト
リフルオロメタンが１０乃至２１重量％、テトラフルオ
ロメタンが１３乃至２４重量％であることを特徴とする
請求項１の冷媒組成物。2. Dichlorofluoromethane is 50 to 65% by weight, chlorodifluoromethane is 4 to 14% by weight, trifluoromethane is 10 to 21% by weight, and tetrafluoromethane is 13 to 24% by weight. The refrigerant composition according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2067527A JPH0655944B2 (en) | 1990-03-16 | 1990-03-16 | Refrigerant composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2067527A JPH0655944B2 (en) | 1990-03-16 | 1990-03-16 | Refrigerant composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03269083A JPH03269083A (en) | 1991-11-29 |
| JPH0655944B2 true JPH0655944B2 (en) | 1994-07-27 |
Family
ID=13347539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2067527A Expired - Fee Related JPH0655944B2 (en) | 1990-03-16 | 1990-03-16 | Refrigerant composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0655944B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003013049A (en) * | 2001-07-03 | 2003-01-15 | Nihon Freezer Kk | Three component-based refrigerant for ultra low temperature |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001023494A1 (en) | 1999-09-28 | 2001-04-05 | Sanyo Electric Co., Ltd. | Refrigerant composition and refrigerating circuit employing the same |
| KR100395221B1 (en) * | 2001-03-21 | 2003-08-19 | 송현갑 | Refrigerant mixture |
| CN107663444B (en) * | 2016-12-23 | 2019-04-05 | 兰州空间技术物理研究所 | A composite refrigerant suitable for temperature range of -45℃～90℃ |
-
1990
- 1990-03-16 JP JP2067527A patent/JPH0655944B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003013049A (en) * | 2001-07-03 | 2003-01-15 | Nihon Freezer Kk | Three component-based refrigerant for ultra low temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03269083A (en) | 1991-11-29 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |