Mitsubishi Jukogyo Kabushiki Kaisha

Tetsuo Ono

Takahisa Hirano

Ryuhei Tanigaki

Tamio Sugimoto

Katsumi Hirooka

Yasuharu Maruiwa

Shoji Fukami

Masatoshi Mukai

Tsutomu Itahana

Takuyuki Itoh

Ryosaku Akimoto

Hideo Kanno

Susumu Kobayashi

Futoru Furuta

A rotary compressor is disclosed which is equipped with a bypass hole for bypassing a fluid under compression to the intake side and the capacity thereof is controlled through opening and closing of the bypass hole with a piston which is operated via a control valve, whereby the bypass hole is opened at or in the vicinity of a discharge port of the compressor and the capacity of the compressor is made to be controllable in the range of one hundred to substantially zero percent. By the application of such a rotary compressor to the compressor for an air conditioner, capacity control in the range of about zero to 100% of discharge quantity can be accomplished so that it becomes possible to obtain cooling capability which is in response to the heat load.

Rotary compressor

Scroll type compressor

An improvement in a capacity control valve for use in a fluid compressor with a relatively high pressure HP and a relatively low pressure LP for changing the operational characteristics thereof by using the relatively high pressure HP taking into consideration that an increased pressure loss of the refrigerant as generated from an increased flow rate thereof and the thermal load on the car cooler would occasionally occur on the part of the relatively high pressure HP during the operation. Wherein a capacity control valve, of the type operative to take the intermediate pressure AP, for the control of a specific amount of compressed gas to be bypassed to the suction side of the fluid compressor, as a linear function of the relatively low pressure LP using a differential pressure between the relatively high pressure HP and the relatively low pressure LP of the fluid compressor, comprises an adjusting device adapted to adjust the intermediate pressure AP in such a manner that the relative low pressure LP is made lower as the relatively high pressure HP becomes higher, and the relatively low pressure LP is made higher as the relatively high pressure HP becomes lower.

Capacity control valve for a compressor

A capacity control device controls an amount of fluid bypassed from a compression chamber formed between contacts of a stationary and revolving spiral elements into a suction chamber by an actuator. The capacity control device provides a feedback mechanism in which a relation between a suction pressure of the compressor and a pressure of actuating the actuator is a function of the first degree and controls the suction pressure to be constant. A capacity control amount of the compressor can be determined only by the suction pressure of the compressor independent of other variation factors. Accordingly, the minimum suction pressure can be restricted strictly and frost control can be attained by the compressor itself.

Capacity control device of scroll-type fluid compressor

A scroll type fluid machine comprising a pair of mutually engaged scroll members each including a side plate and a spiral lap uprightly disposed on an inside surface of the side plate; when the scroll members are relatively revolved in solar motion relationship, a fluid volume in sealed chambers defined by the pair of engaged scroll members being varied, so that a pressure of the fluid in the sealed chambers is thereby varied in order to discharge a gas therefrom, characterized by constituting so that stress may not concentrate at stress concentration portions of the scroll members, i.e., at corners of inner end base portions of the laps and the inside surfaces of the side plates in an eddy center section of the scroll members; and a method for forming the scroll members which permit improving productivity, characterized by forming, at the stress concentration portion of each scroll member, a round having a relatively large curvature radius which is enough to provide it with fatigue strength, and then finishing a relatively small round by means of a cutter for finish working.

Method for forming scroll members used in a scroll type fluid machine

A scroll type fluid machine comprising a pair of mutually engaged scroll members each including a side plate and a spiral lap uprightly disposed on an inside surface of the side plate; when the scroll members are relatively resolved in solar motion relationship, a fluid volume in sealed chambers defined by the pair of engaged scroll members being varied, so that a pressure of the fluid in the sealed chambers is thereby varied in order to discharge a gas therefrom, characterized by constituting so that stress may not concentrate at stress concentration portions of the scroll members, i.e., at corners of inner end base portions of the laps and the inside surfaces of the side plates in an eddy center section of the scroll members; and a method for forming the scroll members which permit improving productivity, characterized by forming, at the stress concentration portion of each scroll member, a round having a relatively large curvature radius which is enough to provide it with fatigue strength, and then finishing a relatively small round by means of a cutter for finish working.

Scroll type fluid machine with prevention of stress concentration

Growing community of inventors

Nagoya, Japan

Tetsuo Ono