JPH01210761A - Refrigerating device - Google Patents
Refrigerating deviceInfo
- Publication number
- JPH01210761A JPH01210761A JP3509288A JP3509288A JPH01210761A JP H01210761 A JPH01210761 A JP H01210761A JP 3509288 A JP3509288 A JP 3509288A JP 3509288 A JP3509288 A JP 3509288A JP H01210761 A JPH01210761 A JP H01210761A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- valve
- pressure
- check valve
- suction
- 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
- 239000003507 refrigerant Substances 0.000 claims abstract description 8
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000007246 mechanism Effects 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、高圧チャンバ方式の圧縮機を備えた冷凍装置
に係り、特に、安定した状態で稼動せしめ得るように改
良した冷凍装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a refrigeration system equipped with a high-pressure chamber type compressor, and particularly relates to a refrigeration system that has been improved so as to be able to operate in a stable state. be.
（従来の技術〕
従来技術によって、例えばショーケースなどを所定の温
度範囲に冷凍するには一一般に、圧縮機の吸入側圧力に
基づいて該圧縮機の運転・停止を制御している。(Prior Art) According to the conventional art, in order to freeze a showcase or the like to a predetermined temperature range, the operation and stop of the compressor is generally controlled based on the pressure on the suction side of the compressor.
この種の制御技術に関しては特公昭６０−５１０２１号
が公知である。Regarding this type of control technology, Japanese Patent Publication No. 60-51021 is known.
第３図は上記公知例の冷凍サイクルを示す系統図、第４
１！！Ｉはその制御回路図である。FIG. 3 is a system diagram showing the refrigeration cycle of the above-mentioned known example;
1! ! I is its control circuit diagram.
第３図に示すショーケース’Ｌｘ、７−２内にサーモス
タット１７−１’、 １７−２’ （第４図）が設けら
れていて、これらのサーモスタットそれぞれが液電磁弁
を開閉制御する。Thermostats 17-1' and 17-2' (FIG. 4) are provided in the showcase 'Lx, 7-2 shown in FIG. 3, and each of these thermostats controls opening and closing of a liquid electromagnetic valve.
上記の液電磁弁は第３図に８−ｔ、８−２で表わされ、
第４図に８−ｔ’、 ８−２’で表わされて、いる、以
下、第４図に表わされている構成部分の図面参照番号に
括弧を付して示す（上記の例では液電磁弁８−１．８−
２ （８−ｔ’、 ８−２’）と記す）。The above liquid solenoid valves are represented by 8-t and 8-2 in FIG.
The drawing reference numbers of the constituent parts shown in FIG. 4 are shown in parentheses (in the above example, they are indicated by 8-t' and 8-2'). Liquid solenoid valve 8-1.8-
2 (written as 8-t', 8-2')).
圧縮機１ｂ（ｌｂ’）は、吸入管路に設けられた低圧圧
力スイッチ１３ （１３’）によって電路を開閉され、
吸入圧が所定値未満になると運転を停止せしめられる。The compressor 1b (lb') has an electric circuit opened and closed by a low pressure switch 13 (13') provided in the suction pipe.
When the suction pressure becomes less than a predetermined value, the operation is stopped.
ショーケース内の温度がサーモスタット１’Ｌｔ’。The temperature inside the showcase is thermostat 1'Lt'.
１’Ｌ２’の復帰温度に上昇した時、液電磁弁８−１（
８−ｔ’） 、 ８−２ （８−２’）を開路させ、高
圧液冷媒が低圧側のショーケース’Ｌｔ、７−２に流れ
ると。When the return temperature rises to 1'L2', the liquid solenoid valve 8-1 (
8-t'), 8-2 (8-2') is opened and the high-pressure liquid refrigerant flows to the low-pressure side showcase 'Lt, 7-2.
吸入圧力の上昇により、圧縮機１ｂ（ｌｂ’）が運転を
開始する。各ショーケース’Ｌｔ、７−２は、サーモス
タット１’Ｌｔ’、 １７−２’により単独に電磁弁ｌ
ｔ （８−ｔ’） 、 ８−２ （８−２’）を制御し
圧縮機１ｂ（ｌｂ’）は吸入圧力の変化により、運転制
御されている。上に述べた従来例における圧縮機は何れ
も低圧チャンバ方式であるから上述のような運転制御が
可能である。Due to the increase in suction pressure, compressor 1b (lb') starts operating. Each showcase 'Lt', 7-2 is independently operated by a solenoid valve l by a thermostat 1'Lt', 17-2'.
t (8-t') and 8-2 (8-2'), and the operation of the compressor 1b (lb') is controlled by changes in suction pressure. Since the compressors in the conventional examples described above are all of the low pressure chamber type, the operation control as described above is possible.
（発明が解決しようとする課題〕
ところが、圧縮機がスクリュー式やスクロール式のよう
な高圧チャンバ方式の場合は従来のような冷凍サイクル
構成による運転制御では種々問題点が多く運転制御する
ことができない、即ち。(Problem to be solved by the invention) However, when the compressor is of a high-pressure chamber type such as a screw type or scroll type, there are various problems that make it impossible to control the operation using the conventional refrigeration cycle configuration. , i.e.
運転停止時、高圧チャンバ内の圧力が低圧側に流入し、
吸入圧力を上昇させ、圧縮機が停止しても又すぐ運転開
始となってしまう、又、高圧側管路にバルブが無いため
、凝縮機から高圧チャンバ内に冷媒液が流入してくる場
合がある。When the operation is stopped, the pressure in the high pressure chamber flows into the low pressure side,
Even if the suction pressure is increased and the compressor stops, it will immediately start operating again.Also, since there is no valve on the high-pressure side pipe, refrigerant liquid may flow into the high-pressure chamber from the condenser. be.
本発明の目的は、高圧チャンバ方式の圧縮機を用いた場
合にも安定した運転制御が可能なように改良した冷凍機
を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerator that is improved so that stable operation control is possible even when a high-pressure chamber type compressor is used.
Ｃ課題を解決するための手段〕
上記の目的を達成する為に劇作した本発明の冷凍機は、
圧縮機の吸入側管路と吐出側管路に逆止弁を設けたこと
を特徴とする６
本発明を実施する場合、吸入側、若しくは吐出側の何れ
か一方に逆止弁を設けただけでも一応の効果は得ら九る
が、吸入側、吐出側の双方に設けることが望ましい。Means for Solving Problem C] The refrigerator of the present invention, which has been developed to achieve the above object, has the following features:
A check valve is provided in the suction side pipe line and the discharge side pipe line of the compressor 6. When carrying out the present invention, a check valve is only provided on either the suction side or the discharge side. However, although some effects may not be obtained, it is desirable to provide them on both the suction side and the discharge side.
更に１本発明を実施する場合の態様として、高圧チャン
バ内と低圧（吸入）側との圧力をバランスさせる為のバ
イパス管を設けることが推奨される。Furthermore, as an embodiment of the present invention, it is recommended to provide a bypass pipe for balancing the pressures in the high pressure chamber and the low pressure (suction) side.
上記の手段を講じた冷凍機においては、吸入側と吐出側
にそれぞれ取付けた逆止弁により、（ｉ）圧縮機停止時
、凝縮器側から圧縮機チャンバ内に冷媒液が流入してく
るのを防止すると共に、（…）圧縮機チャンバ内の高圧
ガスは低圧側へ流れず、吸入圧力を上昇させることもな
い。In a refrigerator with the above measures, check valves installed on the suction side and discharge side prevent (i) refrigerant liquid from flowing into the compressor chamber from the condenser side when the compressor is stopped; In addition, (...) the high-pressure gas in the compressor chamber does not flow to the low-pressure side and does not increase the suction pressure.
運転開始信号により圧縮機チャンバ内の高圧ガスをバイ
パス管により、低圧側へ逃した後に圧縮機を起動させれ
ば、起動も容易であり、圧縮機電動機を最小限の電力に
することが可能である。′【実施例〕
以下１本発明の一実施例を第１図、第２図により説明す
る。圧縮機１ａ、凝縮器３′、受液器４゜複数台のショ
ーケース’Ｌｔ、 ？−２．アキュームレータ１１の主
要機器で冷凍サイクルが形成されている。前述の如く圧
縮機の運転・停止は、ショーケース側の負荷に応じて、
低圧圧力を低圧スイッチ１３で検知して行なっている。If the compressor is started after the high-pressure gas in the compressor chamber is released to the low-pressure side through the bypass pipe in response to the operation start signal, startup is easy and the compressor motor can be powered to a minimum. be. [Example] An example of the present invention will be described below with reference to FIGS. 1 and 2. Compressor 1a, condenser 3', liquid receiver 4゜Multiple showcase 'Lt, ? -2. The main equipment of the accumulator 11 forms a refrigeration cycle. As mentioned above, the compressor starts and stops depending on the load on the showcase side.
This is done by detecting low pressure with a low pressure switch 13.
低圧機１ａは、バルブ機構の無い容積形のスクリュー式
又はスクロール式となっており、運転停止中に高圧側か
ら低圧側に冷媒が逆流して逆転しないように、吐出側（
以下、Ｄ側と略称する）逆止弁２を介装接続しである。The low pressure machine 1a is a positive displacement screw type or scroll type without a valve mechanism, and the discharge side (
Hereinafter, a check valve 2 (hereinafter abbreviated as the D side) is connected.
通液防止の役目は逆止弁を吸入側（Ｓ側と略称）に取付
けても良いが、Ｄ制逆止弁がないと次のような不具合を
生じる。圧縮機にはＤ側のバルブが無くチャンバ内は高
圧側となっており運転停止中に、凝縮器３から液冷媒が
、圧縮機１ａ内部に流入してくる場合が生じ、再始動時
、急激なフォーミングや油上りなど圧縮機１ａの正常な
運転を妨げる現象を生じる虞れがある。A check valve may be installed on the suction side (abbreviated as S side) to prevent liquid flow, but without the D check valve, the following problems will occur. The compressor does not have a valve on the D side, and the inside of the chamber is on the high pressure side, so liquid refrigerant may flow into the compressor 1a from the condenser 3 while the operation is stopped. There is a possibility that phenomena such as excessive foaming and oil leakage may occur that disturb the normal operation of the compressor 1a.
また、Ｄ側のみに逆止弁を設けても、Ｓ側に逆止弁が無
いと１次記のような不具合を生じる。即ち、Ｄ制逆止弁
２にて逆転及び逆流を防止できても、ショーケースなど
で低圧圧力にて運転制御する場合は各ショーケース７−
１．７−２のサーモスタットＩＬｔ’、 １７−２’に
より電磁弁８−ｔ （８−ｔ’） 。Further, even if a check valve is provided only on the D side, if there is no check valve on the S side, the following problems will occur. In other words, even if reverse rotation and backflow can be prevented with the D check valve 2, if the operation is controlled at low pressure in a showcase etc., each showcase 7-
1. Solenoid valve 8-t (8-t') is activated by thermostat ILt', 17-2' of 7-2.
８−２（８−２’）をＯＮ、ＯＦＦさせ、１それにより
低圧圧力を低圧スイッチ１３により圧縮機１ａを運転制
御するべきところ、運転停止した時にＤ制逆止弁２にて
高圧側を遮断していても、圧縮機１ａのチャンバ内の高
圧ガスが低圧側に逆流し、低圧圧力が上昇して低圧スイ
ッチ１３が復帰してしまい、すぐまた運転状態となり、
このようにして運転・停止を繰返してしまう。これを防
止するため、本実施例はＳ側逆止弁１２を取付けている
。本実施例は、Ｄ制逆止弁２とＳ側逆止弁１２とを取付
けて。8-2 (8-2') is turned ON and OFF, and when the low pressure switch 13 should be used to control the operation of the compressor 1a, when the operation is stopped, the high pressure side is controlled by the D check valve 2. Even if it is shut off, the high-pressure gas in the chamber of the compressor 1a flows back to the low-pressure side, the low-pressure pressure rises, and the low-pressure switch 13 returns to its original state, immediately returning to the operating state.
In this way, operation and stopping are repeated. In order to prevent this, an S-side check valve 12 is installed in this embodiment. In this embodiment, the D check valve 2 and the S side check valve 12 are installed.
停止中圧縮機１ａのチャンバ内を高圧に保っているが、
更に次の問題を考えねばならない。While the compressor 1a is stopped, the chamber of the compressor 1a is kept at high pressure.
Furthermore, we must consider the following problem.
バルブ機構のない容積形の圧縮機の場合には、高いバラ
ンス圧力の状態から始動させたときは。In the case of a positive displacement compressor without a valve mechanism, when starting from a state of high balance pressure.
容積比に応じて吐出圧力が著しく上昇し、圧縮機１ａの
電動機出力を大幅に大きくしないと始動できず、又、圧
縮機構の機械的強度も増しておかなくてはならない。（
非容積形ポンプや、バルブ機構を備えた容積形ポンプで
は、必ずしもこの問題は生じない）。The discharge pressure increases significantly depending on the volume ratio, and the motor output of the compressor 1a must be significantly increased to start the compressor, and the mechanical strength of the compression mechanism must also be increased. (
This problem does not necessarily occur with non-displacement pumps or positive displacement pumps with valve mechanisms).
そこで本実施例は、圧縮機チャンバ内の圧力をＳ側逆止
弁１２から低圧側に逃すバイパス管１４を取付け、該バ
イパス管１４の途中にバイパス電磁弁１５を取付けであ
る。低圧スイッチ１３が復帰し運転信 ４号と共にバイ
パス電磁弁１５を開路させ、圧縮機チャンバ内の圧力を
低圧側に逃している。バイパス電磁弁１５の開路と共に
限時継電器１６’に通電させ、一定時間経過後に圧縮機
１ａ（ｌａ’）を運転させている。Therefore, in this embodiment, a bypass pipe 14 is installed to release the pressure in the compressor chamber from the S side check valve 12 to the low pressure side, and a bypass solenoid valve 15 is installed in the middle of the bypass pipe 14. The low pressure switch 13 returns to operation and opens the bypass solenoid valve 15 along with the operation signal No. 4, releasing the pressure inside the compressor chamber to the low pressure side. When the bypass solenoid valve 15 is opened, the time-limited relay 16' is energized, and after a certain period of time has elapsed, the compressor 1a (la') is operated.
以上説明した如く、本実施例によれば高圧チャンバ方式
の圧縮機の場合にて、低圧圧力制御運転を実施する場合
確実に運転制御が可能となり、圧縮機電動機も必要最小
限に出力を小さくでき、又、圧縮機に無理な作用が働か
ず安定した運転が可能となる。As explained above, according to this embodiment, in the case of a high-pressure chamber type compressor, when performing low-pressure pressure control operation, it is possible to reliably control the operation, and the output of the compressor motor can be reduced to the minimum necessary. Moreover, stable operation is possible without any unreasonable action being exerted on the compressor.
本発明によれば、高圧チャンバ方式の圧縮機の場合の低
圧制御運転を可能にすると共に、圧縮機の停止中は圧縮
機内部への冷媒の侵入を防止でき、始動時のフォーミン
グ、油上がりの防止が可能である。更に、圧縮機電動機
の容量を必要最小限まで低減でき、圧縮機構成部材の所
要強度を低減できる。According to the present invention, it is possible to perform low-pressure control operation in the case of a high-pressure chamber type compressor, and to prevent refrigerant from entering the compressor while the compressor is stopped, preventing forming and oil drainage at startup. Prevention is possible. Furthermore, the capacity of the compressor motor can be reduced to the necessary minimum, and the required strength of the compressor components can be reduced.
第１図は本発明の冷凍サイクルの一実施例を示す系統図
、第２図は上記実施例の操作回路図である。
第３図は従来例の冷凍サイクルの系統図、第４図は上記
従来例の操作回路図である。
ｌａ、 ｌｂ・・・圧縮機、２・・・Ｄ制逆止弁、’Ｌ
＋。
７−２・・・ショーケース、８−＋、８−２・・・液電
磁弁、１２・・・Ｓ側逆止弁、１３・・・低圧スイッチ
、１４・・・バイパス管、１５・・・バイパス電磁弁、
ｌａ’・・・圧縮機用電磁接触器、１ａ′・・・圧縮機
用電磁圧縮器す接点、ｌｂ’・・・圧縮器用電磁接触器
、８−１’、 ８−２’・・・液電磁弁。
１３’・・・低圧スイッチ、１５′・・・バイパス電磁
弁、１６′・・・限時継電器、１７−１’、 １７−２
’・・・サーモスタット。
代理人弁理士 秋 本 正 実第１図
第２図
第３図
第４図FIG. 1 is a system diagram showing an embodiment of the refrigeration cycle of the present invention, and FIG. 2 is an operating circuit diagram of the above embodiment. FIG. 3 is a system diagram of a conventional refrigeration cycle, and FIG. 4 is an operating circuit diagram of the conventional example. la, lb...compressor, 2...D check valve, 'L
+. 7-2...Showcase, 8-+, 8-2...Liquid solenoid valve, 12...S side check valve, 13...Low pressure switch, 14...Bypass pipe, 15...・Bypass solenoid valve,
la'...Magnetic contactor for compressor, 1a'...Magnetic compressor contact for compressor, lb'...Magnetic contactor for compressor, 8-1', 8-2'...Liquid solenoid valve. 13'...Low pressure switch, 15'...Bypass solenoid valve, 16'...Time-limiting relay, 17-1', 17-2
'···thermostat. Representative Patent Attorney Tadashi Akimoto Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
張弁と、蒸発器とを備えた冷凍サイクルを構成し、 （ｂ）上記の圧縮機は、圧縮された冷媒ガスを圧縮機チ
ャンバ内に放出する構造であって、 （ｃ）冷媒ガスの吸入圧力を検知する手段を有し、 （ｄ）上記吸入圧力検出手段によって検出された吸入圧
力が所定の値未満であれば前記の圧縮機を停止せしめ、
所定の値以上であれば該圧縮機を運転せしめる自動制御
手段を設けた冷凍装置において、 （ｅ）前記圧縮機の吸入系統および吐出系統の少なくと
も何れか一方に逆止弁を設けたこと、 を特徴とする冷凍装置。 ２、（ｆ）前記の逆止弁は吸入側管路及び吐出側管路の
双方に設けたものであり、 （ｇ）かつ、 （イ）該双方の逆止弁の間と、 （ロ）吸入側逆止弁よりも蒸発器側の低圧側管路 と、をバイパスさせる管路を設け、 （ｈ）上記バイパス管路に電磁開閉弁を介装接続し、 （ｉ）更に、 （ハ）圧縮機の運転を停止した後、吸入圧力が所定の値
に上昇したときに前記電磁開閉弁を開路させ、 （ニ）上記の開路から設定時間を経過した時点で前記圧
縮機を運転させると共に、 （ホ）前記電磁開閉弁を閉路せしめる自動制御手段を設
けたこと を特徴とする特許請求の範囲第１項に記載の冷凍装置。[Claims] 1. (a) A refrigeration cycle comprising at least a refrigerant compressor, a condenser, an expansion valve, and an evaporator; (c) has means for detecting the suction pressure of the refrigerant gas, and (d) has a structure in which the suction pressure detected by the suction pressure detection means is a predetermined value. If it is less than that, the compressor is stopped;
In a refrigeration system equipped with automatic control means that operates the compressor if the value exceeds a predetermined value, (e) a check valve is provided in at least one of the suction system and the discharge system of the compressor. Characteristic refrigeration equipment. 2. (f) The above check valve is provided in both the suction side pipe line and the discharge side pipe line, (g) and (a) between both check valves, and (b) A low-pressure side line on the evaporator side than the suction side check valve is provided, (h) an electromagnetic on-off valve is interposed and connected to the bypass line, (i) further, (c) After stopping the operation of the compressor, when the suction pressure rises to a predetermined value, the electromagnetic on-off valve is opened, (d) when a set time has elapsed from the opening, the compressor is started to operate, (e) The refrigeration system according to claim 1, further comprising automatic control means for closing the electromagnetic on-off valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63035092A JP2506141B2 (en) | 1988-02-19 | 1988-02-19 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63035092A JP2506141B2 (en) | 1988-02-19 | 1988-02-19 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01210761A true JPH01210761A (en) | 1989-08-24 |
| JP2506141B2 JP2506141B2 (en) | 1996-06-12 |
Family
ID=12432312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63035092A Expired - Lifetime JP2506141B2 (en) | 1988-02-19 | 1988-02-19 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2506141B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002130146A (en) * | 2000-10-19 | 2002-05-09 | Kobe Steel Ltd | Oil-cooled compression type refrigerator |
| WO2013145027A1 (en) * | 2012-03-30 | 2013-10-03 | 三菱電機株式会社 | Refrigeration device and refrigeration cycle apparatus |
| JP2016017644A (en) * | 2014-07-04 | 2016-02-01 | ホシザキ電機株式会社 | Refrigeration circuit of freezer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936482U (en) * | 1982-08-31 | 1984-03-07 | 三菱電機株式会社 | air conditioner |
| JPS59137391U (en) * | 1983-03-02 | 1984-09-13 | 三洋電機株式会社 | Refrigeration equipment |
-
1988
- 1988-02-19 JP JP63035092A patent/JP2506141B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936482U (en) * | 1982-08-31 | 1984-03-07 | 三菱電機株式会社 | air conditioner |
| JPS59137391U (en) * | 1983-03-02 | 1984-09-13 | 三洋電機株式会社 | Refrigeration equipment |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002130146A (en) * | 2000-10-19 | 2002-05-09 | Kobe Steel Ltd | Oil-cooled compression type refrigerator |
| JP4521967B2 (en) * | 2000-10-19 | 2010-08-11 | 株式会社神戸製鋼所 | Oil-cooled compression refrigerator |
| WO2013145027A1 (en) * | 2012-03-30 | 2013-10-03 | 三菱電機株式会社 | Refrigeration device and refrigeration cycle apparatus |
| CN104220819A (en) * | 2012-03-30 | 2014-12-17 | 三菱电机株式会社 | Refrigeration device and refrigeration cycle apparatus |
| JPWO2013145027A1 (en) * | 2012-03-30 | 2015-08-03 | 三菱電機株式会社 | Refrigeration apparatus and refrigeration cycle apparatus |
| CN104220819B (en) * | 2012-03-30 | 2016-05-11 | 三菱电机株式会社 | Refrigerating plant and freezing cycle device |
| US9651288B2 (en) | 2012-03-30 | 2017-05-16 | Mitsubishi Electric Corporation | Refrigeration apparatus and refrigeration cycle apparatus |
| JP2016017644A (en) * | 2014-07-04 | 2016-02-01 | ホシザキ電機株式会社 | Refrigeration circuit of freezer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2506141B2 (en) | 1996-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |