Heat exchanger and air conditioner

Abstract

A heat exchanger includes tubes which are arranged in parallel and through which a fluid for heating air flows. Fins which are joined to the tubes. The tubes and the fins are arranged to form three or more heating parts and at least two bypass passages each of which is provided between adjacent heating parts, through which the air passes without exchanging heat with the thermal fluid. First and second tank parts are arranged at two longitudinal ends of the tubes and extend across the bypass passages and the heating parts. The bypass passages and the heating parts are arranged perpendicular to an air flow direction. The heating heat exchanger is disposed in an air conditioning case down stream from an evaporator. The air conditioning case is separated into two air outlets. Cold air from the bypass passages and hot air from the heating parts are mixed prior to being blown through the air outlets.

1 . An air conditioner for adjusting temperature of air to be blown into a compartment, the air conditioner comprising:
 a case for defining an air passage through which air flows into the compartment;   a heating heat exchanger, which is located in the case to heat air in the air passage, and to have an outer bypass passage outside of the heating heat exchanger within the case, through which air bypasses the heating heat exchanger, wherein the heating heat exchanger includes
 a plurality of tubes which are arranged in parallel and through which a thermal fluid for heating air flows, 
 a plurality of fins which are joined to the tubes and form heat transfer surfaces in contact with the air, wherein the tubes and the fins are arranged to form a plurality of heating parts in which the air is heated, and 
 an inner bypass passage provided between adjacent heating, parts, through which the air passes without exchanging heat with the thermal fluid; 
   a thermal insulating portion arranged at a boundary area between the outer bypass passage and an adjacent heating part and at a boundary area between the inner bypass passage and an adjacent heating part, to extend along the boundary areas in an air flow direction; and   a door member which is located in the case, wherein   the inner bypass passage, the outer bypass passage and the heating parts are arranged in an arrangement direction perpendicular to an air flow direction, and   wherein the door member is located to open and close the inner bypass passage, the outer bypass passage and air paths of the heating parts.   
     
     
         2 . The air conditioner according to  claim 1 ,
 wherein the outer bypass passage is provided at two outer sides of the heating parts positioned at two end parts in the heating heat exchanger in the arrangement direction.   
     
     
         3 . The air conditioner according to  claim 1 ,
 wherein the door member is a rotatable plate door having a rotation shaft.   
     
     
         4 . The air conditioner according to  claim 3 , wherein the rotation shaft is located at a boundary area between the inner bypass passage and the heating part in the arrangement direction. 
     
     
         5 . The air conditioner according to  claim 1 , wherein the door member is a slidable door that is slidable along surfaces of the heating parts and an open surface of the inner bypass passage. 
     
     
         6 . The air conditioner according to  claim 5 ,
 wherein the slidable door includes a rigid plate member slidable along the arrangement direction where the heating parts, the inner bypass passages and the outer bypass passage are arranged, and   wherein the rigid plate member has an open portion through which air passes, and a shutting portion which shuts the air flow.   
     
     
         7 . The air conditioner according to  claim 5 ,
 wherein the slidable door includes a flexible film member having an open portion through which air passes, and a shutting portion which shuts the air flow.   
     
     
         8 . The air conditioner according to  claim 7 ,
 wherein the film member is movable in a direction perpendicular to the arrangement direction where the heating parts, the inner bypass passages and the outer bypass passage are arranged.   
     
     
         9 . The air conditioner according to  claim 7 ,
 wherein the film member is movable in a state where both upstream and downstream sides of the heating heat exchanger in the air flow direction are covered by the film member.