Refrigeration cycle device

Abstract

A refrigeration cycle device includes an outside evaporator, an inside evaporator, an evaporating pressure adjusting valve, a charging port, a pressure change buffer. The outside evaporator exchanges heat between a refrigerant flowing out of a heater and an outside air. The inside evaporator exchanges heat between the refrigerant flowing out of the outside evaporator and a heat-exchange target medium. The evaporating pressure adjusting valve is disposed at a position downstream of the inside evaporator and adjusts an evaporating pressure of the refrigerant in the inside evaporator. The charging port is disposed at a position downstream of the evaporating pressure adjusting valve. The pressure change buffer is disposed between the evaporating pressure adjusting valve and the charging port and defines a buffer space.

What is claimed is: 
     
         1 . A refrigeration cycle device comprising:
 a compressor configured to compress and discharge a refrigerant;   a heater configured to heat a heat-exchange target fluid using the refrigerant, as a heat source, discharged from the compressor;   an outside evaporator configured to exchange heat between an outside air and the refrigerant flowing out of the heater;   an inside evaporator configured to exchange heat between the refrigerant flowing out of the outside evaporator and the heat-exchange target fluid;   a first refrigerant passage through which the refrigerant flowing out of the heater is guided toward an inlet of the outside evaporator;   a first decompressor disposed in the first refrigerant passage and configured to vary an opening area of the first refrigerant passage;   a second refrigerant passage through which the refrigerant flowing out of the outside evaporator passes through the inside evaporator and is guided toward a suction inlet of the compressor;   a second decompressor disposed in the second refrigerant passage between the outside evaporator and the inside evaporator and configured to vary an opening area of the second refrigerant passage;   an evaporating pressure adjusting valve disposed in the second refrigerant passage at a position downstream of the inside evaporator and configured to adjust an evaporating pressure of the refrigerant in the inside evaporator;   a third refrigerant passage having an end fluidly connected to a portion of the second refrigerant passage between the evaporating pressure adjusting valve and the compressor, the refrigerant flowing out of the outside evaporator being guided toward the suction inlet of the compressor through the third refrigerant passage;   an opening-closing member configured to selectively open and close the third refrigerant passage;   a charging port disposed in the second refrigerant passage at a position downstream of the evaporating pressure adjusting valve to supply the refrigerant therethrough; and   a pressure change buffer disposed in the second refrigerant passage between the evaporating pressure adjusting valve and the charging port, the pressure change buffer defining a buffer space therein to restrict an inner pressure in the second refrigerant passage from rapidly changing when the refrigerant is supplied through the charging port.   
     
     
         2 . The refrigeration cycle device according to  claim 1 , wherein
 the buffer space is defined by a reservoir that reserves an excess amount of the refrigerant.   
     
     
         3 . The refrigeration cycle device according to  claim 1 , wherein
 the buffer space is defined by a muffler that is configured to reduce a pressure pulsation generated when the refrigerant is discharged from the compressor.   
     
     
         4 . The refrigeration cycle device according to  claim 1 , wherein
 the buffer space is defined by a pipe.