| 摘要 |
An expansion valve incorporated in the refrigerant circuit of, for example, a refrigerator and adapted for controlling the flow rate of the refrigerant in said refrigerant circuit. The expansion valve has a pressure chamber (2) formed in the valve body (1) and adapted for receiving the discharge pressure of the refrigerant circuit, a deflectable partition member (8) disposed in the pressure chamber (2) and presenting a pressure-receiving surface (8a) at the free end thereof, an electric actuator (21) connected to the surface of the pressure-receiving surface (8a) opposite to the pressure-receiving surface (8a) through a compression spring (13), a needle (15) connected to the pressure-receiving surface (8a) and adapted to cooperate with an orifice (16) which provides a communication between two valve chambers (3a, 3b) in the valve body (1), and a controller for operating the electric actuator (21) in accordance with the temperature of the refrigerant gas in the compressor discharge side of the refrigerant cycle, whereby the needle (15) operates in response to the displacement of the partition member (8) which is caused in accordance with changes in the temperature and the pressure of the refrigerant gas in the compressor discharge side of the refrigerant circuit, whereby the degree of opening of the orifice (16) is changed to control the degree of superheating of the refrigerant at the discharge side of the compressor. |
