Zexel Valeo Climate Control Corporation

Tgk Co., Inc.

Valeo Japan Co., Ltd.

Shunji Muta

Hiroshi Kanai

Shunichi Furuya

Kenji Iijima

Yuji Kawamura

Ryuji Kanno

Kazutaka Kowada

Yoshie Sato

The outer diameter &PHgr;d of a top face-side end portion of pistons is made slightly smaller than the outer diameter &PHgr;d of a hollow cylindrical portion of the pistons other than the top face-side end portion . Thus, the tilt load of a top face-side portion of the piston is divided and distributed, and at the same time, lubricating oil is held at the top face-side end portion of the piston

Swash plate type refrigerant compressor

An expansion device capable of preventing an abnormal increase in the high-pressure in a freezing cycle and having, as an integrated unit thereof, a mechanism capable of quickly responding to an abnormal increase in the high-pressure and the low-pressure is provided. A means for displacement (bellows) which becomes displaced in correspondence to the high-pressure is linked to a valve element of a restrictor valve mechanism to displace a rod provided with a safety valve mechanism . If the high-pressure reaches a level equal to or higher than a first specific pressure (the limit to the normal operating pressure), a first portion of the safety valve mechanism becomes disengaged from a relief hole that communicates between a high-pressure space and a low-pressure passage to be replaced by a second portion which allows passage through the relief hole , thereby leaking the coolant in the high-pressure space to the low-pressure passage and preventing a further increase in the high-pressure. In addition, a low-pressure side rupture disk mechanism that becomes ruptured if the low-pressure reaches a level equal to a second specific pressure to communicate between the low-pressure passage and the atmosphere is provided at the low-pressure passage . A high-pressure side rupture disk mechanism that becomes ruptured if the high-pressure reaches a level equal to or higher than a third specific pressure to communicate between the high-pressure passage and the atmosphere is provided at the high-pressure passage

Expansion device

The freezing cycle according to the present invention is provided with a first means for safety that leaks the high pressure to the low-pressure side when the high pressure reaches a level equal to or higher than a first specific pressure, a second means for safety that releases the high pressure into the atmosphere when the high pressure reaches a level equal to or higher than a second specific pressure, a third means for safety that stops the operation of the compressor when the high pressure reaches a level equal to or lower than a third specific pressure and a fourth means for safety that releases the low-pressure into the atmosphere when the low-pressure reaches a level equal to or higher than a specific pressure. In addition, a splash-preventing film is formed over specific areas of devices constituting the freezing cycle.

Refrigerating cycle

Growing community of inventors

Saitama, Japan

Shunji Muta