公开(公告)号：JPH11351173A

公开(公告)日：1999-12-21

申请号：JP17401698

申请日：1998-06-05

Applicant: ZEXEL CORP

Inventor： ONO MITSUYA ,  SAKAMOTO KATSUMI ,  SUZUKI HIROYUKI ,  IZAWA RYOSUKE ,  TAGUCHI KOICHI

IPC: F04C29/06 ,  F04C18/344 ,  F04C28/06 ,  F04C29/12 ,  F04C29/10

Abstract: PROBLEM TO BE SOLVED: To surely avoid the compression of liquid without decreasing discharge performance during starting. SOLUTION: The front side end face 1c of a cam ring 1 and a groove 40 of predetermined sectional area to communicate a valve storage room 1a and a compression room 12a with each other are provided. When the operation of a compressor is stopped, lubricant is tending to enter into a back pressure room 13a in the process that pressure in the compressor is balanced, but cooling medium gas in the valve storage room 1a (a discharge room 10) escapes through the groove 40 to the compression room 12a, pressure in the back pressure room 13a rapidly rises and pressure in the compressor is balanced in a short time, so that the quantity of the lubricant entering into the back pressure room 13a can be restricted. As a result, noise due to the compression of liquid is reduced when the operation of the compressor is restarted.