Expansion valve and refrigeration cycle

• US 20030189104A1
• Filed: 03/26/2003
• Published: 10/09/2003
• Est. Priority Date: 04/08/2002
• Status: Active Grant

• Current Assignee: Fujikoki Corporation
• Original Assignee: Fujikoki Corporation
• Inventors: Watanabe, Kazuhiko, Shimura, Tomonori
• Granted Patent: US 6,758,055 B2
• Time in Patent Office: Days
• US Class Current: 236/92B
• CPC Class Codes: F25B 2341/0683 the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas
• CPC Class Codes: F25B 41/335 via diaphragms
• CPC Class Codes: F25B 9/002 characterised by the refrigerant

Abstract

An orifice member 10 disposed at an orifice 32a of a valve body 30 is formed of a material such as stainless steel harder than the aluminum material forming valve body 30. Orifice member 10 is substantially cylindrical, with one open end 10a having a flat surface that comes in planar contact with a contact surface of valve body 30 constituting orifice 32a, and the other open end being tapered so as to oppose to a valve member 32d. A screw portion is formed to the outer side of orifice member 10 enabling it to be engaged to a screw portion formed on orifice 32a of valve body 30. The joint can be secured by applying and curing an adhesive between orifice member 10 and orifice 32a. Since orifice member 10 comes in planar contact with valve body 30 having an anodized aluminum film, the film is not damaged by orifice member.

Claims

1. An expansion valve comprising:

a valve body including a high-pressure-side path, a low-pressure-side path and a valve opening communicating said two paths;

a valve member disposed so as to oppose to said valve opening; and

a diaphragm for moving said valve member via an actuating rod;

wherein said valve body receives an aluminum anodization treatment, and said orifice is equipped with an orifice member harder than the valve body and having a flat contact surface that comes into planar contact with said valve body.

2. An expansion valve according to claim 1, wherein said orifice member is a substantially cylindrical member, comprising one open end constituting the flat contact surface that comes into planar contact with the valve body, another open end constituting a surface to which is opposed said valve member, and a screw portion formed to an outer side portion of said orifice member by which said orifice member is fixed to said valve body.

3. An expansion valve according to claim 2, wherein an adhesive is applied to said screw portion.

4. A refrigeration cycle comprising:

a compressor, a condenser for condensing a gaseous refrigerant heated and compressed by the compressor, a liquid tank for separating the condensed refrigerant into vapor and liquid and for removing moisture and dust from the refrigerant, an expansion valve for expanding the refrigerant from the liquid tank, and an evaporator for realizing heat-exchange between the refrigerant and air, the components all connected by a piping;

wherein said refrigerant is a non-chlorinated halogenated hydrocarbon, and said expansion valve is the expansion valve according to claim 1.

5. A refrigeration cycle comprising:

a compressor, a condenser for condensing a gaseous refrigerant heated and compressed by the compressor, a liquid tank for separating the condensed refrigerant into vapor and liquid and for removing moisture and dust from the refrigerant, an expansion valve for expanding the refrigerant from the liquid tank, and an evaporator for realizing heat-exchange between the refrigerant and air, the components all connected by a piping;

wherein said refrigerant is a non-chlorinated halogenated hydrocarbon, and said expansion valve is the expansion valve according to claim 2.

6. A refrigeration cycle comprising:

a compressor, a condenser for condensing a gaseous refrigerant heated and compressed by the compressor, a liquid tank for separating the condensed refrigerant into vapor and liquid and for removing moisture and dust from the refrigerant, an expansion valve for expanding the refrigerant from the liquid tank, and an evaporator for realizing heat-exchange between the refrigerant and air, the components all connected by a piping;

wherein said refrigerant is a non-chlorinated halogenated hydrocarbon, and said expansion valve is the expansion valve according to claim 3.