公开(公告)号：JPS6467575A

公开(公告)日：1989-03-14

申请号：JP22235187

申请日：1987-09-04

Applicant: MATSUSHITA REFRIGERATION

Inventor： MIYAMOTO ICHIRO ,  TOMIZAKI OSAMU ,  IKEDA FUMIO

IPC: F25B45/00

Abstract: PURPOSE: To enhance productivity by starting a compressor for a predetermined time when the inner pressure is reduced through a pressure reducing pipe provided at one position on the high pressure side and supplying the air from the pressure reduced side to the high pressure side thereby shortening the evacuation time. CONSTITUTION: When a vacuum pump 13 is started to evacuate the high pressure 26 side through a pressure reducing pipe 9, the inner pressure reaches 10 Torr or thereabout about 30 sec later. When an RC 2 is started by supplying power through plug-in 33, the air is fed forcibly from the low pressure side 27 to the high pressure side 26. When the RC 2 is stopped about 18 sec later and pressure reduction is continued further for 15 sec, a pressure of 2 Torr is achieved on the high pressure side 26. Inner pressure on the low pressure side 27 increases to 1.8 Torr because the pressure in a cooling system 1 is balanced after stopping the RC 2 but equilibrium is sustained subsequently. More specifically, when the RC 2 is operated during pressure reduction on the high pressure side 26, evacuation time is shortened and one more pressure reduction pipe can be eliminated.