JPS63120063U

JPS63120063U -

Info

Publication number: JPS63120063U
Application number: JP1309887U
Authority: JP
Priority date: 1987-01-30
Filing date: 1987-01-30
Publication date: 1988-08-03
Anticipated expiration: 2002-01-30
Also published as: JPH0519724Y2

Description

[Brief explanation of the drawing]

第１図および第２図は本考案の実施例を示し、
第１図は冷媒回路図、第２図は運転制御回路図で
ある。第３図は液ハンマーの発生原因の説明図で
ある。図中、１：圧縮機、５：受液器、９：電磁弁、
８：受液器５下流の高圧液管、８′：電磁弁９下
流の高圧液管、１０：吸入管、１１：低圧圧力ス
イツチ、１２：バイパス回路、１３：第２の電磁
弁、Ａ：限時手段、Ｂ：電磁弁制御手段、Ｃ：第
２の電磁弁制御手段、Ｄ：デフロスト指令手段。 1 and 2 show an embodiment of the present invention,
FIG. 1 is a refrigerant circuit diagram, and FIG. 2 is an operation control circuit diagram. FIG. 3 is an explanatory diagram of the cause of occurrence of liquid hammer. In the figure, 1: compressor, 5: liquid receiver, 9: solenoid valve,
8: High pressure liquid pipe downstream of liquid receiver 5, 8': High pressure liquid pipe downstream of solenoid valve 9, 10: Suction pipe, 11: Low pressure switch, 12: Bypass circuit, 13: Second solenoid valve, A: Time limit means, B: Solenoid valve control means, C: Second solenoid valve control means, D: Defrost command means.

Claims

[Claims for Utility Model Registration] (1) A low pressure switch 11 provided in the suction pipe 10 of the compressor 1, a liquid receiver 5, and a solenoid valve 9 provided in the high pressure liquid pipe 8 downstream of the liquid receiver 5. , a time limiter A that outputs a signal only for a certain period of time at the start of each heating operation and cooling operation; and a timer A that outputs a signal only for a certain period of time when starting each heating operation and a cooling operation; In a refrigeration system equipped with a pump-down mechanism consisting of a solenoid valve control means B for opening and closing, a bypass circuit 12 provided between the upper part of the liquid receiver 5 and a high-pressure liquid pipe 8' downstream of the solenoid valve 9;
A second solenoid valve 13 interposed in the bypass circuit 12
and second solenoid valve control means C that outputs a closing command signal to the second solenoid valve 13 while the time limit means A is outputting a signal. (2) The refrigeration system is heated by the four-way switching valve 2, the defrost command means D that determines whether or not defrost is necessary in the heat source side heat exchanger 3 and outputs a defrost command signal, and the defrost command signal that the defrost command means D outputs. The refrigeration system according to claim 1, which is a heat pump type refrigeration system including a reverse cycle defrost mechanism that temporarily switches the four-way switching valve 2 to a cooling operation side during operation. (3) The second solenoid valve control means C is configured to output a closing command signal to the second solenoid valve 13 when the time limit means A is outputting a signal and after the defrost finger cooling means D has stopped outputting the signal. The refrigeration device according to claim 2 of the utility model registration claim.