Patent ID: 7530235
Filing Date: 2009-05-12
Classification: F01K

Abstract:
1. A pump apparatus comprising: a closed vessel; a refrigerant introduction path connected to the vessel at a lower part of the vessel; a valve disposed in the refrigerant introduction path; a refrigerant discharge path connected to the vessel at an upper part of the vessel; a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; a temperature regulating device for heating and cooling a refrigerant into the closed vessel; and a conduit connecting to the refrigerant discharge path or to the upper part of the closed vessel and a valve for decreasing the pressure in the closed vessel and allowing introduction of the refrigerant into the closed vessel through the conduit; wherein the temperature regulating device includes a cooling apparatus disposed inside the closed vessel in an upper region of the closed vessel, and a heating apparatus disposed inside the closed vessel in a lower region of the closed vessel.