Fujikoki Corporation

Fuji Koki Manufacturing Co., Ltd.

Fujikoki Mfg. Co., Ltd.

Tokyo Electron Limited

Fujikori Corporation

Masamichi Yano

Kazuhiko Watanabe

Kazuto Kobayashi

Mitsuya Fujimoto

Masakatsu Minowa

Daisuke Watari

Tetsurou Ikoma

Eiji Fukuda

Makoto Sudo

Takuji Furuta

Takashi Okayama

Tanaka Hazime

Tetsuro Ikoma

An expansion valve includes a valve body having a valve body hole, a first passage, a bottomed valve chamber, a second passage, a third passage and a guide member disposed in the valve body hole between the first passage and the third passage. The valve body hole has a first valve body hole portion and a second valve body hole portion of different diameters forming a valve body step between the second passage and the first passage. The guide has a first guide portion and a second guide portion of different diameters forming a guide portion step. The guide is sized to be slidably received by the valve body hole in a close-fitting relationship with the first valve body hole portion receiving the first guide portion, the second valve body hole portion receiving the second guide portion and the valve body step and the guide portion step contacting each other.

Expansion valve

The body of a valve has an orifice that internally connects a high-pressure passage through which a refrigerant flows in and a low-pressure passage through which the refrigerant flows out. The valve includes a valve plug for adjusting the flow rate of the refrigerant flowing in the orifice, an operating rod for moving the valve plug in a valve opening direction, and a temperature sensing drive unit for driving the operating rod. A support ring for constraining the spherical valve plug is located on the upper-stream side of the high-pressure passage with respect to the orifice. The support ring is formed of a circular annular portion capable of elastic deformation and vibration-proof springs. The springs support the valve plug.

An evaporatorof an air conditioner comprises a refrigerant entrance portand a refrigerant exit port. A division wallof the evaporator is extended to form a housing. The housingcomprises an inletfor the refrigerant traveling from a compressor, an outletcommunicating with the entrance portof the evaporator, and a refrigerant pathreturning from the evaporator. The cassette unitcomprises a pipe member, a flange memberand a lid member, with major components of the expansion valve such as a diaphragm and a driving member for driving a valve means assembled thereto. The cassette unitis accommodated in a holewith steps of the housingto complete the expansion valve.

An expansion valvecomprises a piping memberhaving passages to which pipes for refrigerant are connected, and a cassette unit, which are formed as separate components. The cassette unitcomprises a flange portionand a tube memberwhich are welded together, and to the interior of which are fixed a guide member, an orifice memberand a plate member. According to the pressure of gas filled in a gas charge chamberdefined by a lidand a diaphragm, the diaphragmis displaced, the movement of which is transmitted through a stopperto a shaft member. The shaft memberis guided by a guide memberand drives a valve memberdisposed within a valve chamber. The cassette unitis inserted to the piping memberand fixed by a ring. Seal membersare fit to necessary areas.

An expansion valvecomprises a piping memberequipped with passages to which refrigerant pipes are connected, and a cassette unitthe two members being formed as separate units. The cassette unitcomprises a tube memberhaving a flange portionand at the interior of the tube memberare fixed a guide memberan orifice memberand a plate memberThe pressure of the gas filled in a gas charge chamberdefined by a lidand a diaphragmdisplaces the diaphragm, the displacement being transmitted through a stopper memberto a shaft memberThe shaft memberis guided by a guide memberand controls the valve meansinside a valve chamberThe cassette unitis inserted to the piping memberand fixed to position by a ringSeal membersandare equipped to appropriate areas between the cassette unit and the piping member.

An expansion valveincludes a square rod-shaped valve body. A first pathinto which refrigerant is introduced, a valve chamberformed near the bottom of the path, a second pathfor refrigerant heading toward an evaporator and a third pathfor refrigerant returning from the evaporator are provided to the valve body. A valve memberprovided inside the valve chamber is operated by a power elementvia an actuating rod. In order to assemble the expansion valve, an assembled orifice memberand an assembled guide memberare press-fitted into an opening provided to the valve body

An expansion valvecomprises a piping memberhaving passages to which pipes for a refrigerant are connected, and a cassette unit, which are formed as separate components. The cassette unitcomprises a tube memberaccommodating a guide member, an orifice memberand a plate member. A diaphragmsandwiched between a rising portionof a lidand an endof the tube memberand defining a gas charge chamberis displaced, the movement of which is transmitted to a shaft member. The shaft memberis guided by a guide memberand drives a valve memberdisposed within a valve chamber. The cassette unitis inserted to the piping memberand fixed by a ring. Seal membersare disposed to necessary areas.

An expansion valvecomprises a square-column-shaped valve body, and a spherical valve meanshoused within a valve chamberopposing against a valve seat. A working shaftcoming into contact with said valves meansconnects to a stopper member, thereby transmitting to the valve meansthe movement of a diaphragmbeing displaced by the pressure change in a pressure chamberof a power element. A lower housingof the power elementis provided with an opening portion and claws, which enable the power element to be coupled to a mounting unitformed to the top portion of the valve body. An elastic packing memberenables the element to be securely and airtightly coupled to the body. According to the present invention, the assembling of the valve is simplified and the manufacturing cost is reduced.

Two case members of the same shape are attached to the body of an expansion valve and a temperature sensing drive element through sound insulating members. Each of the two case members is formed having upper retaining and retainable portions at its upper part and lower retaining and retainable portions at its lower part. The upper retaining portion, upper retainable portion, lower retaining portion, and lower retainable portion of one of the case members are in engagement with the upper retainable portion, upper retaining portion, lower retainable portion, and lower retaining portion, respectively, of the other case member.

An expansion valve comprises a housing having refrigerant paths and a cassette unit . The cassette unit comprises a flange and a tube member formed integrally thereto. An adjustment plate member is mounted to the small-diameter end of the tube member having steps, the plate member having an external thread formed thereto. A bottom portion of the inner bore of the housing for mounting the cassette is provided with an internal thread . A head portion of the lid member of the cassette unit has a hexagonal shape, which enables the cassette unit to be screwed onto the housing using a tool such as a wrench.

The valve body has an orifice that provides communication between a high-pressure side passage through which a cooling medium flows in and a low-pressure side passage through which the cooing medium flows out. Also, the valve is provided with a valve element that adjusts the volume of the cooling medium passing through this orifice, an operating rod that operates the valve element in the valve opening position, and a temperature-sensing drive section that drives this operating rod. On the upstream side of the orifice of the high-pressure side passage is disposed a support ring that constrains the ball-shaped valve element of the valve body.

A method for preventing hunting of a thermal expansion valve used to control the flow of refrigerant supplied to an evaporator in a refrigeration cycle. A refrigeration apparatus is provided with a compressor, a condenser, a receiver, an expansion valve, and an evaporator connected in this order, spherically activated carbon made of phenol having pore sizes fit for molecular sizes of a working fluid is prepared; and the spherically activated carbon is provided into the expansion valve; whereby hunting, or the repeated opening and closing of the expansion valve, is prevented.

Method for preventing hunting of expansion valve within refrigeration cycle

An expansion valve comprises a piping member equipped with passages to which refrigerant pipes are to be connected, and a cassette unit the two members being formed as separate units. The cassette unit comprises a tube member having a flange portion and at the interior of the tube member are fixed a guide member an orifice member and a plate member The pressure of gas filled in a gas charge chamber defined by a lid and a diaphragm displaces the diaphragm the displacement being transmitted to a shaft member through a stopper member including at the center thereof a tubed portion storing an absorbent. The shaft member is guided by a guide member and controls the valve means inside a valve chamber The cassette unit is inserted to the piping member and fixed to position by a ring Seal members and are equipped to appropriate areas between the cassette unit and the piping member.

An expansion valve comprises a substantially prismatic-shaped valve body made of aluminum alloy. On the valve body is formed a first passage through which a liquid-phase refrigerant travels towards an evaporator, and a second passage through which a gas-phase refrigerant travels from the evaporator toward a compressor. On the upper portion of the valve body is mounted a power element portion for driving the valve mounted in the middle of a first passage On the side surfaces of the valve body are formed protruding portions and to the protruding portions, penetrating holes for inserting the bolt for mounting the expansion valve are formed.

A system and method for preventing hunting of a thermal expansion valve used to control the flow of refrigerant supplied to an evaporator in a refrigeration cycle. A refrigeration apparatus is provided with a compressor, a condenser, a receiver, an expansion valve, and an evaporator connected in this order, spherically activated carbon made of phenol having pore sizes fit for molecular sizes of a working fluid is prepared; and the spherically activated carbon is provided into the expansion valve; whereby hunting, or the repeated opening and closing of the expansion valve, is prevented.

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Tokyo, Japan

Masamichi Yano