公开(公告)号：JPH0357896A

公开(公告)日：1991-03-13

申请号：JP19525689

申请日：1989-07-26

Applicant: ZEXEL CORP

Inventor： NAKAJIMA NOBUFUMI

IPC: F04C28/26 ,  F04B49/00 ,  F04C18/344 ,  F04C27/00 ,  F04C28/14

Abstract: PURPOSE:To make the turning movement of a control member smooth and improve startability and controllability, by arranging so that a seal member may be furnished at a side block instead of the pressure receiving portion of the control member and seal resistance may be reduced and also, gas leak through an opening may be utilized. CONSTITUTION:When the suction pressure Ps of a suction chamber 11 becomes more than a predetermined value due to the change of heat load, bellows 31a dwindles and a ball valve 31b is closed, and an opening/closing valve mechanism 31 comes to a closing valve condition. Afterwards, control pressure Pc1 becomes higher than Pc2, and a control member 50 conducts a quick rotation in the right direction. Next, when suction pressure Ps becomes less than a predetermined value, bellows 31a expands and the ball valve 31b is opened, and the opening/ closing valve mechanism 31 comes to an opening valve condition. Afterwards, control pressure Pc1 becomes smaller than Pc2, and the control member 50 makes a left rotation without starting hunting, and stops at a semi operation position. Thus, seal resistance is made small without furnishing a seal member 64 at a pressure receiving portion 53, and also, the turning control of the control member 50 is conducted by utilizing aggressively the leak of refrigerant gas which is from an opening 37 between the pressure receiving portion 53 and the inner wall of a pressure operation chamber 43, so a movement becomes smooth.

公开(公告)号：JPH033996A

公开(公告)日：1991-01-10

申请号：JP13969489

申请日：1989-06-01

Applicant: ZEXEL CORP

Inventor： NAKAJIMA NOBUFUMI ,  YAMAGUCHI TOSHIO

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

Abstract: PURPOSE:To easily rotate a control member at the time of a start and improve startability by providing an opening/closing valve opened when the difference between the discharge pressure and the control pressure is small and guiding the discharge pressure into the high- pressure chamber of a pressure operating chamber. CONSTITUTION:The pressure receiving section 26 of a control member is located at the extreme position of the partial operation side of a pressure operating chamber 23 when a compressor is started, the ball valve body 38C of an opening/closing valve 38 is located at the opened position by the exciting force of a spring 38d until the discharge pressure Pd reaches the preset value, the opening/closing valve 38 opens a communicating hole 38a, and the discharge pressure Pd is guided into a high-pressure chamber 23 via the communicating hole 38a. The pressure receiving section 26 is smoothly slid to the full operation position side by the introduction of the discharge pressure Pd, because the fastening margin of a seal member 27 is small and the friction resistance is small. When the discharge pressure Pd reaches the preset value into the stationary operation state after a start, the ball valve body 38c is displaced, and the communicating hole 38a is closed. The discharge pressure with the preset value or above is prevented from being guided into the high-pressure chamber 23, and the normal pressure control by the discharge pressure Pd from only an orifice 28 is performed.