VALVE BEING USED AS BOTH CHECK VALVE AND ELECTRONIC EXPANSION VALVE COOLING AND HEATING SYSTEM AND HEAT PUMP SYSTEM

摘要

The present invention relates to an electronic expansion valve serving as a check valve, an air conditioning and heating system, and a heat pump system. A main body housing having a first port formed on the lower side and having a fluid inlet and outlet, and a second port formed around the upper side of the first port and through which the fluid enters and exits; A working rod assembly installed in an upper space in the main body housing and having a lifting rod for lifting and lowering; And a flow path between the first port and the second port is formed by opening the orifice hole when the lifting rod is lowered to perform the function of the expansion valve Orifice assembly; And an annular spaced space between the perimeter of the orifice assembly and the interior of the body housing for blocking flow through the annular spaced space of fluid entering through the first port and through the annular spaced space of fluid entering through the second port. And a check valve switching unit that performs a check valve function while permitting the flow of the check valve. The check valve function is performed when the orifice hole is blocked by the rise of the lifting rod. Further, a heating / cooling system and a heat pump system including the same are proposed.