Fujikoki Corporation

Tomonori Shimura

Kazuhiko Watanabe

Yusuke Takahashi

Eiji Fukuda

Ryo Matsuda

Tomoari Ohuchi

Masashi Hayasaka

Toshimichi Kureha

Shintaro Tano

Expansion valve with solenoid valve

To provide a stepping motor which can precisely and reliably detect stopping of a rotor with respect to a stopper with a simple structure, i.e., positioning of a base point of the rotor, and provide a motorized valve using it. The stepping motor includes a statorand a rotorrotationally driven by the stator, and a detection rotordetecting a rotation position of the rotor. The detection rotoris rotatably disposed on a co-axial center L with the rotorand rotationally driven via a rotation drive mechanism between the rotorand the detection rotor. The rotation drive mechanism has a drive play having a predetermined length or angle in the rotation direction.

Stepping motor and motorized valve using it

Expansion valve

An expansion valveintegrated with a solenoid valve includes a valve bodyand a valve chamberformed inside the valve bodyto which a high-pressure refrigerant is introduced. A valve memberforms a throttle flow path between a valve seat, and controls the amount of refrigerant flowing therethrough. The valve bodyis operated by the movement of a stopper memberof a power elementvia an actuating rod. The high-pressure refrigerant acts on a surfaceof the stopper memberopposite to a diaphragmvia a pressure equalizing passage, a connecting chamberof a solenoid valve, and a pressure equalizing passage. The stopper memberis sealed between the guide member, so that the high-pressure refrigerant does not act directly on the diaphragm.

Expansion valve integrated with solenoid valve

An orifice member disposed at an orifice of a valve body is formed of a material such as stainless steel harder than the aluminum material forming valve body . Orifice member is substantially cylindrical, with one open end having a flat surface that comes in planar contact with a contact surface of valve body constituting orifice , and the other open end being tapered so as to oppose to a valve member . A screw portion is formed to the outer side of orifice member enabling it to be engaged to a screw portion formed on orifice of valve body . The joint can be secured by applying and curing an adhesive between orifice member and orifice . Since orifice member comes in planar contact with valve body having an anodized aluminum film, the film is not damaged by orifice member.

Expansion valve and refrigeration cycle

Growing community of inventors

Tokyo, Japan

Tomonori Shimura