JPH0357364U

JPH0357364U -

Info

Publication number: JPH0357364U
Application number: JP11557989U
Authority: JP
Priority date: 1989-09-29
Filing date: 1989-09-29
Publication date: 1991-06-03

Description

[Brief explanation of drawings]

第１図は本考案の低温エアコン用冷凍装置にお
ける機能対応図、第２図は本考案の実施例１にか
かる低温エアコン用冷凍装置の冷媒回路図、第３
図は本考案の実施例１にかかる低温エアコン用冷
凍装置のデフロスト運転時における作用を説明す
るためのフローチヤート、第４図は本考案の実施
例２にかかる低温エアコン用冷凍装置の冷媒回路
図、第５図は本考案の実施例２にかかる低温エア
コン用冷凍装置のデフロスト運転時の作用を説明
するためのフローチヤートである。１……圧縮機、２……凝縮器、３……減圧機構
、４……蒸発器、５……主冷媒回路、６……吐出
管、７……低圧冷媒配管、８……電磁開閉弁、９
……デフロスト用減圧機構、１０……バイパス回
路、１１……温度検知手段、１２……コントロー
ラ、１３……第１判定手段、１４……第２判定手
段、１５……制御手段、Ａ……冷媒流量調整手段
。 Fig. 1 is a function correspondence diagram of the refrigeration system for a low temperature air conditioner according to the present invention, Fig. 2 is a refrigerant circuit diagram of the refrigeration system for a low temperature air conditioner according to Embodiment 1 of the present invention, and Fig. 3
The figure is a flowchart for explaining the action during defrost operation of the refrigeration system for a low temperature air conditioner according to the first embodiment of the present invention, and FIG. 4 is a refrigerant circuit diagram of the refrigeration system for a low temperature air conditioner according to the second embodiment of the present invention. , FIG. 5 is a flow chart for explaining the operation during defrost operation of the refrigeration device for a low temperature air conditioner according to the second embodiment of the present invention. 1... Compressor, 2... Condenser, 3... Pressure reduction mechanism, 4... Evaporator, 5... Main refrigerant circuit, 6... Discharge pipe, 7... Low pressure refrigerant piping, 8... Solenoid on-off valve ,9
... Defrost pressure reducing mechanism, 10 ... Bypass circuit, 11 ... Temperature detection means, 12 ... Controller, 13 ... First judgment means, 14 ... Second judgment means, 15 ... Control means, A ... Refrigerant flow rate adjustment means.

Claims

[Scope of claims for utility model registration] 1 Compressor 1, condenser 2, pressure reducing mechanism 3, evaporator 4
The main refrigerant circuit 5 includes a discharge pipe 6 of the compressor 1 and a low-pressure refrigerant pipe 7 on the inlet side of the evaporator 4.
In the refrigeration system for a low temperature air conditioner, a bypass circuit 10 is interposed between the defrost circuit and the defrost circuit. a refrigerant flow rate adjusting means A that adjusts the refrigerant flow rate flowing through the bypass circuit 10 during operation;
a first determination means that outputs a signal when the refrigerant temperature detected by the temperature detection means 11 becomes equal to or higher than a first set temperature that is equal to a refrigerant temperature that should cause ice to melt to an extent that the ice on the evaporator 4 does not peel off; 13, a second determination means 14 that outputs a signal when the refrigerant temperature detected by the temperature detection means 11 becomes equal to or lower than a second set temperature, which is lower than the first set temperature; and an output signal from the first determination means 13. The refrigerant flow rate adjusting means A is controlled to reduce the refrigerant flow rate flowing through the bypass circuit 10, and the second
A refrigeration system for a low-temperature air conditioner, characterized in that a control means 15 is provided for controlling the refrigerant flow rate adjusting means A to increase the flow rate of refrigerant flowing through the bypass circuit 10 based on an output signal from the determination means 14. 2. The refrigeration system for a low-temperature air conditioner according to claim 1, wherein the refrigerant flow rate adjusting means A is an electromagnetic on-off valve 8 interposed in the bypass circuit 10. 3. The refrigeration system for a low-temperature air conditioner according to claim 1, wherein the refrigerant flow rate adjusting means A is a three-way proportional valve 16 interposed at a connection site between the bypass circuit 10 and the main refrigerant circuit 5. Device.