Hitachi, Ltd.

Kenji Emi

Kosaku Sayo

Toshihiko Fukushima

Seigo Miyamoto

Yukio Takahashi

Isao Hayase

Masaru Ito

Kunihiko Takao

Masao Mizukami

Kenichi Kawashima

Atsushi Suginuma

Toshikazu Ito

Akira Tezuka

Toshio Sudo

Hideo Usui

Seijiro Tani

Kiyosi Yamamoto

Masahiro Moritaka

A variable displacement compressor comprises a housing forming a crank chamber, a shaft, expansible chambers including pistons, a swash plate connected to the shaft so as to be smoothly changeable in inclination against the shaft and driven to rotate, a wobble plate rotatable on the swash plate, a rotation preventing mechanism including a shoe member slidable in an axial direction, and a pressure control valve which is provided in a refrigerant passage from a suction port of the compressor to the expansible chamber to control the pressure of refrigerant to be sucked responsive to the suction pressure and both to the suction pressure and to the discharge pressure when the discharge pressure is high. The refrigerant passage has a sharply bent portion for separating lubrication oil from a refrigerant flowing therein and communicates with the crank chamber to discharge blow-by gas therefrom.

Variable displacement wobble plate compressor with capacity control valve

A refrigerant flow rate measuring apparatus has a means for detecting the opening degree A of an expansion valve of a refrigeration cycle, a pressure detecting means for detecting the refrigerant pressure Pi at upstream side of the expansion valve, a pressure detecting means for detecting the refrigerant pressure Po at downstream side of the expansion valve, a refrigerant density detecting means for detecting the density .gamma.i of the refrigerant at the inlet side of the expansion valve, a converting means for directly or indirectly converting the values detected by the detecting means into electric signals, and a calculating means for calculating the flow rate of the refrigerant in accordance with the following formula, from the electric signals. ##EQU1##

Apparatus for measuring refrigerant flow rate in refrigeration cycle

In a refrigeration cycle in which the opening of the expansion valve is controlled by the super-heat degree of the refrigerant periodically detected at the outlet of the evaporator, a negative control signal is produced to rapidly change the opening of the expansion valve when the detected super-heat degree has reached zero. As a result, occurrence of the liquid back is prevented.

Refrigerant flow control device

Growing community of inventors

Katsuta, Japan

Kenji Emi