Heat exchanger and heat pump type hot water supply apparatus equipped with same

Abstract

A heat exchanger 21 is provided with a metal tube 47 that has a support member 55 inhibiting deformation in the thickness direction in a fluid flow channel 53, and a multiple-hole metal tube 45 that is stacked on one side of the metal tube 47 in the thickness direction and has an opposing surface disposed opposite an outer surface 61 on the one side of the metal tube 47 and joined by at least part thereof to the outer surface 61 on the one side.

1 . A heat exchanger comprising:
 a metal tube that has a flat shape with a width greater than a thickness, a fluid flow channel formed inside thereof along a longitudinal direction, respective outer surfaces formed on one side and the other side in a thickness direction, and a support portion formed in the fluid flow channel and inhibiting deformation in the thickness direction; and   a multiple-hole metal tube stacked on one side of the metal tube in the thickness direction, the multiple-hole metal tube that has a flat shape with a width greater than a thickness, a plurality of fluid flow channels formed inside thereof along the longitudinal direction, and an opposing surface disposed opposite the outer surface on said one side of the metal tube and joined by at least part thereof to the outer surface on said one side.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the support portion has a plurality of columnar bodies arranged along the longitudinal direction of the fluid flow channel, one end of each of the columnar bodies in an axial direction is joined to an inner surface on either side in the thickness direction of the fluid flow channel, and the other end of each of the columnar bodies in the axial direction is disposed on an inner surface side on the other side in the thickness direction of the fluid flow channel.   
     
     
         3 . The heat exchanger according to  claim 2 , wherein
 both ends in the axial direction of at least one of the plurality of columnar bodies are respectively joined to the inner surface on one side and the inner surface on the other side of the fluid flow channel.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the support portion has a plurality of first columnar bodies arranged along the longitudinal direction of the fluid flow channel on an inner surface on one side in the thickness direction of the fluid flow channel and a plurality of second columnar bodies arranged along the longitudinal direction of the fluid flow channel on an inner surface on the other side in the thickness direction of the fluid flow channel,   the first columnar bodies extend from the inner surface on said one side toward the inner surface on said other side, and   the second columnar bodies extend from the inner surface on said other side toward the inner surface on said one side, and distal end portions thereof abut on or are disposed close to respective distal end portions of the plurality of first columnar bodies.   
     
     
         5 . The heat exchanger according to  claim 4 , wherein
 at least one of the plurality of first columnar bodies and at least one of the plurality of second columnar bodies are joined together at the distal end portions thereof   
     
     
         6 . The heat exchanger according to  claim 1 , wherein
 the support portion is a corrugated plate-like body disposed along the longitudinal direction of the fluid flow channel.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein
 the support portion has a plurality of protruding portions arranged along the longitudinal direction of the fluid flow channel, and each of the protruding portions protrudes from an inner surface on either side in the thickness direction of the fluid flow channel toward an inner surface on the other side in the thickness direction.   
     
     
         8 . The heat exchanger according to  claim 7 , wherein
 a size of each of the protruding portions in a width direction is less than a size thereof in said longitudinal direction.   
     
     
         9 . The heat exchanger according to  claim 7 , wherein
 the protruding portions are formed by causing the outer surfaces on one side and other side in the thickness direction to recede toward said other side or said one side.   
     
     
         10 . The heat exchanger according to  claim 1 , wherein
 the support portion has a plurality of first protruding portions arranged along the longitudinal direction of the fluid flow channel on an inner surface on one side in the thickness direction of the fluid flow channel, and a plurality of second protruding portions arranged along the longitudinal direction of the fluid flow channel on an inner surface on the other side in the thickness direction of the fluid flow channel, and   the first protruding portions protrude from the inner surface on said one side toward the inner surface on said other side, and the second protruding portions protrude from the inner surface on said other side toward the inner surface on said one side.   
     
     
         11 . The heat exchanger according to  claim 10 , wherein
 the first protruding portions are formed by causing the outer surface on one side in the thickness direction to recede toward said other side, and the second protruding portions are formed by causing the outer surface on said other side in the thickness direction to recede toward said one side.   
     
     
         12 . The heat exchanger according to  claim 10 , wherein
 some or all of the plurality of first protruding portions are provided at positions opposite the second protruding portions in the thickness direction.   
     
     
         13 . The heat exchanger according to  claim 12 , wherein
 the first protruding portions and the second protruding portions respectively have elongated shapes in a plan view thereof, and   the first protruding portions and the second protruding portions, which are facing each other in the thickness direction, are provided so as to cross each other in a plan view thereof.   
     
     
         14 . The heat exchanger according to  claim 13 , wherein
 a longitudinal direction of the first protruding portions is inclined to one side in a width direction of the metal tube with respect to the longitudinal direction of the metal tube,   a longitudinal direction of the second protruding portions is inclined to the other side in the width direction with respect to the longitudinal direction of the metal tube, and   an inclination angle of the first protruding portions with respect to the longitudinal direction is equal to an inclination angle of the second protruding portions with respect to the longitudinal direction.   
     
     
         15 . The heat exchanger according to  claim 12 , wherein
 the first protruding portions and the second protruding portions respectively have elongated shapes in a plan view thereof, and   a longitudinal direction of the first protruding portions and the second protruding portions, which are facing each other in the thickness direction, is parallel to the longitudinal direction of the metal tube.   
     
     
         16 . The heat exchanger according to  claim 12 , wherein
 the plurality of first protruding portions are arranged so that three or more rows thereof extending in the longitudinal direction are formed, and in a row positioned in a central portion in the width direction from among these rows, the first protruding portions are provided at positions opposite the second protruding portions in the thickness direction.   
     
     
         17 . The heat exchanger according to  claim 16 , wherein in rows positioned at both sides of the row positioned in the central portion in the width direction, the first protruding portions are provided at positions displaced in the longitudinal direction with respect to the second protruding portions. 
     
     
         18 . The heat exchanger according to  claim 17 , wherein
 the plurality of first protruding portions are arranged so that a plurality of rows thereof extending in a inclination direction inclined with respect to the longitudinal direction are formed,   the plurality of second protruding portions are arranged so that a plurality of rows thereof extending in the inclination direction are formed, and   the rows of the first protruding portions in the inclination direction and the rows of the second protruding portions in the inclination direction are disposed alternately along the longitudinal direction.   
     
     
         19 . The heat exchanger according to  claim 1 , wherein
 the fluid flow channel includes a first fluid flow channel and a second fluid flow channel provided parallel to each other in the width direction and extending in the longitudinal direction,   the first fluid flow channel is formed by folding a metal sheet at a position along the longitudinal direction and bending the metal sheet into a tubular shape so that one end side in the width direction of the metal sheet abuts on a surface on one side of the metal sheet, and said one end side is joined to said one surface along the longitudinal direction,   the second fluid flow channel is formed by folding the metal sheet at another position along the longitudinal direction and bending the metal sheet into a tubular shape so that another end side in the width direction of the metal sheet abuts on said one surface at a position adjacent to said one end side, and the other end side is joined to said one surface along the longitudinal direction, and   the support portion is constituted by parts of the metal sheet, each part extending from said one end side and said other end side in the thickness direction or a direction inclined from the thickness direction.   
     
     
         20 . The heat exchanger according to  claim 1 , wherein the multiple-hole metal tube is a first multiple-hole metal tube, and
 the heat exchanger further comprises a second multiple-hole metal tube stacked on said other side of the metal tube in the thickness direction, the second multiple-hole metal tube that has a flat shape with a width greater than a thickness, a plurality of fluid flow channels formed inside thereof along the longitudinal direction, and an opposing surface that is disposed opposite an outer surface on said other side of the metal tube and joined by at least part thereof to the outer surface on said other side.   
     
     
         21 . The heat exchanger according to  claim 1 , wherein substantially the entire opposing surfaces are joined to the outer surfaces. 
     
     
         22 . The heat exchanger according to  claim 1 , which is spirally wound so that one end in the longitudinal direction is disposed inside and another end in the longitudinal direction is disposed outside. 
     
     
         23 . A heat pump type hot water supply apparatus comprising:
 a coolant circuit having a compressor, the heat exchanger according to  claim 1 , a pressure reducing mechanism, an evaporator, and a pipe for connecting these elements; and   a hot water storage circuit having a tank storing water, a water inlet pipe for introducing water from the tank into the fluid flow channel of the heat exchanger, and a hot water outlet pipe for returning water heated by the heat exchanger into the tank.