JPS6332989B2 - - Google Patents
Info
- Publication number
- JPS6332989B2 JPS6332989B2 JP11759077A JP11759077A JPS6332989B2 JP S6332989 B2 JPS6332989 B2 JP S6332989B2 JP 11759077 A JP11759077 A JP 11759077A JP 11759077 A JP11759077 A JP 11759077A JP S6332989 B2 JPS6332989 B2 JP S6332989B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- pressure
- low
- switch
- low pressure
- 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
Links
- 238000005057 refrigeration Methods 0.000 claims 2
- 238000001816 cooling Methods 0.000 description 15
- 239000003507 refrigerant Substances 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Description
【発明の詳細な説明】
蒸発器の蒸発温度を必要以上に下げないように
して温度コントロールの安定化を図り、また圧縮
機の吸入圧力が必要以上に低下することにより生
じる圧縮機過熱等のトラブルを防止し、さらには
圧縮機を必要以上に運転することによる余分な電
力消費を避けるために、圧縮機の運転を、吸入側
圧力がある限度まで低下すると停止させるように
しているが、従来方式のものは、圧縮機の吸入側
にただ１個の低圧圧力スイツチを設けているにす
ぎない。[Detailed description of the invention] Temperature control is stabilized by preventing the evaporation temperature of the evaporator from lowering more than necessary, and troubles such as compressor overheating caused by lowering the suction pressure of the compressor more than necessary are solved. In order to prevent this and to avoid unnecessary power consumption due to compressor operation more than necessary, compressor operation is stopped when the suction side pressure drops to a certain limit, but conventional methods The latter has only one low-pressure pressure switch on the suction side of the compressor.
したがつて従来のものでは、たとえば昼間に対
して夜間とか、あるいは夏場に対して冬場などと
冷却負荷を異にして、制御低圧圧力を異にするば
あいでも、低圧圧力スイツチを最大冷却負荷のば
あいにセツトしてある。すなわち、夜間でも昼間
のばあいの最大負荷に相当する低圧圧力で、また
冬場でも夏場の最大負荷に相当する低圧圧力で冷
凍機が運転される。 Therefore, with the conventional system, even if the control low pressure is changed depending on the cooling load, such as during the day versus night, or during the summer versus winter, the low pressure switch is set to the maximum cooling load. It has been set in case. That is, the refrigerator is operated at a low pressure corresponding to the maximum load during the daytime even at night, and at a low pressure corresponding to the maximum load during the summer even during the winter.
一例を挙げると、冷却器を備える冷蔵、冷凍シ
ヨーケースの冷却のばあい、夏場と冬場ではケー
ス周囲の環境温度（室内温度）は異なる。 For example, when cooling a refrigerator or freezer case equipped with a cooler, the environmental temperature (indoor temperature) around the case is different in summer and winter.
したがつてケース内を０℃に冷却するばあい、
夏場におけるケース周囲の環境温度が例えば25
℃、湿度が60％、ケース負荷が100％だとすると、
冷却器の冷媒蒸発温度を−15℃位にする必要があ
るのに対し、冬場におけるケース周囲の環境温度
が例えば18℃、湿度が40％、ケース負荷が60％だ
とすると、冷却器の冷媒蒸発温度は−９℃位で済
む。 Therefore, when cooling the inside of the case to 0℃,
For example, if the environmental temperature around the case in summer is 25
℃, humidity is 60%, and case load is 100%.
The refrigerant evaporation temperature of the cooler needs to be around -15℃, but if the environmental temperature around the case in winter is, for example, 18℃, the humidity is 40%, and the case load is 60%, then the refrigerant evaporation temperature of the cooler is The temperature is around -9℃.
しかし、従来の冷凍機では低圧圧力制御用のス
イツチは１個しかないので、冷却器の冷媒蒸発温
度は冬場でも夏場と同じ−15℃のままであり、冬
場には冷凍機の運転時間を夏場よりも短くするこ
とによつてケース内を０℃程度に保つようにして
いる（このようにセツトしないと、夏場に充分な
冷却をすることができない。）。 However, because conventional refrigerators have only one switch for low-pressure control, the refrigerant evaporation temperature in the cooler remains at -15°C even in winter, the same as in summer. By making the length shorter than that, the temperature inside the case can be maintained at about 0°C (if it is not set in this way, it will not be possible to cool it sufficiently in the summer).
ために、冷却負荷の小なる冬場には圧縮機が無
駄に運転させられ、エネルギーが浪費される。 Therefore, during the winter when the cooling load is small, the compressor is run unnecessarily and energy is wasted.
このような無駄な運転は夜間運転のばあいも同
様に行われる。 This kind of wasteful driving also occurs when driving at night.
本発明は、圧縮機の吸入側に動作圧力の異なる
複数の低圧圧力開閉器をそれぞれ並列に接続して
おき、上記低圧圧力開閉器中その時の冷却負荷に
対応するものを選択し、この選択された低圧圧力
開閉器によつて最適な吸入圧力で圧縮機を起動・
停止することにより、冷却シヨーケース用冷凍機
の運転が、冷却負荷に応して合理的かつ経済的に
行なわれるようにした。 The present invention connects a plurality of low-pressure switches having different operating pressures in parallel on the suction side of a compressor, selects one of the low-pressure switches that corresponds to the cooling load at that time, and selects the one corresponding to the cooling load at that time. The compressor can be started at the optimum suction pressure using the low-pressure switch.
By stopping the cooling system, the refrigerator for the cooling case can be operated rationally and economically according to the cooling load.
以下添付図面に示す一実施例を参照して本発明
を詳説する。 The present invention will be described in detail below with reference to an embodiment shown in the accompanying drawings.
図において、符号１は圧縮機、２は凝縮器、３
は膨張弁、４は冷却シヨーケース内の蒸発器、５
は受液器を示す。 In the figure, 1 is a compressor, 2 is a condenser, and 3 is a compressor.
is an expansion valve; 4 is an evaporator in the cooling case; 5 is an evaporator in the cooling case;
indicates a liquid receiver.
また、LP1，LP2…LPoは圧縮機１の吸入側に
設けられた低圧圧力開閉器で、それぞれ異なる吸
入圧力下において開路するように設定してある。 Furthermore, LP 1 , LP 2 . . . LP o are low-pressure switches provided on the suction side of the compressor 1, and are set to open under different suction pressures.
低圧圧力開閉器LP1〜LPoにはそれぞれリレー
R1，R2…Roの各接点r1，r2…roを直列に接続して
あつて、電磁開閉器CTに対してｎ個のアンド回
路（r1とLP1，r2とLP2…roとLPo）から成るｎ個
のオア回路を形成するようにしてあり、各リレー
R1，R2…Roには、選択器Ｐによつて選択される
リレー選択スイツチP1〜Poを接続してある。 Each low pressure switch LP 1 to LP o has a relay.
The contacts r 1 , r 2 ... r o of R 1 , R 2 ... R o are connected in series, and n AND circuits (r 1 and LP 1 , r 2 and LP 2 ...r o and LP o ) are formed to form n OR circuits, and each relay
Relay selection switches P 1 to P o selected by a selector P are connected to R 1 , R 2 . . . R o .
次ぎにこのシーケンスの動作について説明す
る。 Next, the operation of this sequence will be explained.
たとえば夏場のように、圧縮機１における吸入
圧力の下限が低い場合は、選択器Ｐによつてたと
えばリレー選択スイツチPoをオンにする。 For example, when the lower limit of the suction pressure in the compressor 1 is low, such as in summer, the selector P turns on, for example, the relay selection switch P o .
かくすることにより、リレーRoが励磁されて、
その接点roが閉成し、圧縮機１は作動する。圧縮
機１の冷媒吸入圧が低圧圧力開閉器LPoの制御低
圧圧力になると、低圧圧力開閉器LPoがオフとな
り、圧縮機１は停止する。 By doing this, relay R o is energized and
The contact r o is closed and the compressor 1 is activated. When the refrigerant suction pressure of the compressor 1 reaches the low pressure controlled by the low pressure switch LP o , the low pressure switch LP o is turned off and the compressor 1 is stopped.
また冬場には、夏場より高い制御低圧圧力でオ
フとなるように、たとえばリレー選択スイツチ
P1を選択器Ｐによつて選択すると、リレーR1が
励磁されて、その接点r1が閉成し、圧縮機１は作
動する。そして圧縮機１の冷媒吸入圧が低圧圧力
開閉器LP1の制御低圧圧力になると、低圧圧力開
閉器LP1がオフとなつて圧縮機１は停止する。 In addition, in winter, for example, a relay selection switch can be set to turn off at a higher control low pressure than in summer.
When P 1 is selected by the selector P, the relay R 1 is energized, its contact r 1 is closed, and the compressor 1 is operated. When the refrigerant suction pressure of the compressor 1 reaches the low pressure controlled by the low pressure switch LP 1 , the low pressure switch LP 1 is turned off and the compressor 1 is stopped.
以上のように本発明では、圧縮機の吸入側にそ
れぞれ異なる圧力において作動する複数の圧力開
閉器を持続し、冷却負荷に応じて低圧圧力開閉器
を選択し、選択された低圧圧力開閉器の開閉動作
に応じて前記圧縮機の動作を制御することを特徴
とするから、圧縮機を冷却負荷に適合させた状態
で運転せしめることができ、運転効率を向上させ
るとともに電力の無駄を無くし、さらに圧縮機の
過熱等によるトラブルを可及的に少なくできる
等々、すぐれた効果を奏することができる。 As described above, in the present invention, a plurality of pressure switches operating at different pressures are maintained on the suction side of the compressor, a low pressure switch is selected according to the cooling load, and the selected low pressure switch is Since the operation of the compressor is controlled according to the opening/closing operation, the compressor can be operated in a state adapted to the cooling load, improving operational efficiency and eliminating waste of electric power. It is possible to achieve excellent effects such as reducing troubles caused by overheating of the compressor as much as possible.
第１図は本発明の一実施例を示す冷却回路図、
第２図は電気回路図である。
図中１……圧縮機、２……凝縮器、３……膨張
弁、４……蒸発器、５……受液器、LP1〜LPo…
…低圧圧力開閉器、Ｐ……選択器、P1〜Po……
リレー選択スイツチ、R1〜Ro……リレー、CT…
…電磁開閉器。
FIG. 1 is a cooling circuit diagram showing an embodiment of the present invention;
FIG. 2 is an electrical circuit diagram. In the figure, 1...compressor, 2...condenser, 3...expansion valve, 4...evaporator, 5...liquid receiver, LP 1 to LP o ...
...Low pressure switch, P...Selector, P 1 ~ P o ...
Relay selection switch, R 1 ~ R o ...Relay, CT...
…electromagnetic switch.
Claims (1)
れ、かつそれぞれ冷凍負荷に対応する異なる低圧
圧力でオフ作動する複数個の常閉の低圧圧力開閉
器と、選択器により選択され、前記低圧圧力開閉
器にそれぞれ対応するリレー選択スイツチと、こ
れらリレー選択スイツチへそれぞれ直列に接続さ
れたリレーとを備え、前記低圧圧力開閉器へ前記
各リレーの接点をそれぞれ直列に接続したアンド
回路を並列に接続し、そのアンド回路を圧縮機発
停用の電磁開閉器へ直列に接続し、前記リレー選
択スイツチを選択することにより、対応する低圧
圧力開閉器にて圧縮機が起動・停止させられるよ
うにしたことを特徴とする冷凍機における圧縮機
の運転制御装置。1 A plurality of normally-closed low-pressure switches are provided on the suction side of the compressor in the refrigeration circuit and are turned off at different low-pressure pressures corresponding to the refrigeration load, and the low-pressure switches are selected by a selector and and relays connected in series to the relay selection switches respectively, and an AND circuit in which the contacts of each of the relays are connected in series to the low pressure pressure switch is connected in parallel. By connecting the AND circuit in series to an electromagnetic switch for starting and stopping the compressor, and selecting the relay selection switch, the compressor can be started and stopped by the corresponding low pressure switch. An operation control device for a compressor in a refrigerator, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11759077A JPS5451011A (en) | 1977-09-30 | 1977-09-30 | Compressor unloader for refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11759077A JPS5451011A (en) | 1977-09-30 | 1977-09-30 | Compressor unloader for refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5451011A JPS5451011A (en) | 1979-04-21 |
| JPS6332989B2 true JPS6332989B2 (en) | 1988-07-04 |
Family
ID=14715574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11759077A Granted JPS5451011A (en) | 1977-09-30 | 1977-09-30 | Compressor unloader for refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5451011A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0234474Y2 (en) * | 1980-05-14 | 1990-09-17 | ||
| JPS5863384U (en) * | 1981-10-26 | 1983-04-28 | 富士電機株式会社 | Low pressure switch for refrigerators |
| JPS59186493U (en) * | 1983-05-30 | 1984-12-11 | 株式会社東芝 | Refrigeration equipment |
| JPS60253766A (en) * | 1984-04-04 | 1985-12-14 | ゼネラル・エレクトリツク・カンパニイ | Heat transfer system, and device and method for controlling said system, and air-conditioning system containing related mechanism detecting and indicating condition of liquid reduction of said system and specific small-sized pressure switch and control method and device thereof |
| JPH0541317Y2 (en) * | 1985-10-15 | 1993-10-19 |
-
1977
- 1977-09-30 JP JP11759077A patent/JPS5451011A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5451011A (en) | 1979-04-21 |
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