Water heat exchanger, manufacturing method of water heat exchanger, and refrigeration cycle apparatus

Abstract

To provide a water heat exchanger, a manufacturing method of the water heat exchanger, and a refrigeration cycle apparatus capable of preventing corrosion of a brazing material and deterioration of a refrigerant. The water heat exchanger according to the present embodiment includes a plurality of stacked heat-exchange plates, a joint (9) provided on at least one cover plate (14) of a pair of cover plates sandwiching the plurality of heat exchange plates, a first refrigerant pipe (10) brazed to the joint (9) by a brazing material (11), and a protector (12) provided to prevent contact between the brazing material (11) and the refrigerant circulating to the plurality of heat exchange plates through the first refrigerant pipe (10) and the joint (9).

1 . A water heat exchanger comprising:
 a plurality of heat-exchange plates that are stacked;   a pair of cover plates that sandwich the plurality of heat-exchange plates;   a joint that is provided on at least one of the pair of cover plates;   a refrigerant pipe that is brazed to the joint by a brazing material; and   a protector provided in a manner that prevents contact between the brazing material and a refrigerant flowing through the plurality of heat-exchange plates via the refrigerant pipe and the joint.   
     
     
         2 . The water heat exchanger according to  claim 1 , wherein the protector is made of vinyl resin. 
     
     
         3 . A manufacturing method of the water heat exchanger according to  claim 1 , comprising a step of forming the protector by dipping a joint part in a solution containing the vinyl resin. 
     
     
         4 . A refrigeration cycle apparatus comprising:
 a compressor;   an expander and;   the water heat exchanger according to  claim 1  connected to the compressor and the expander and configured to function as at least one of an evaporator and a condenser.   
     
     
         5 . A refrigeration cycle apparatus comprising:
 a compressor;   an expander and;   the water heat exchanger according to  claim 2  connected to the compressor and the expander and configured to function as at least one of an evaporator and a condenser.