Vehicular air-conditioning system

Abstract

A heating-use heat exchanger which includes a first heater core which exchanges heat between a first liquid and air blown into a passenger compartment and a second heater core which exchanges heat between a second liquid which is higher in temperature and smaller in flow rate than the first liquid and blown air which is heated by the first heater core is held in an air-conditioning case so that an inlet side tank part is at the bottom and an exit side tank part is at the top and the tube longitudinal direction is slanted. Due to this, the high temperature second liquid flowing into the second heater core is stored inside of the inlet side tank part in a region above the tube inlet side ends over the entire stacking direction of the plurality of tubes, then flows into the plurality of tubes.

1 . A vehicular air-conditioning system comprising a heating-use heat exchanger which uses a first liquid and a second liquid with a higher temperature and smaller flow rate than said first liquid as heat sources to heat air blown into a passenger compartment, wherein
 said heating-use heat exchanger comprises a first heat exchange part which exchanges heat between said first liquid and said blown air, and a second heat exchange part which exchanges heat between said second liquid and said blown air which was heated by said first heat exchange part,   said second heat exchange part comprises a plurality of tubes stacked together, an inlet side tank part which is connected to first end sides of said plurality of tubes in the longitudinal direction and which forms a liquid inlet side, and an exit side tank part which is connected to the other end sides of the plurality of tubes in the longitudinal direction and which forms a liquid exit side,   said second heat exchange part is held in an air-conditioning case so that said inlet side tank part is positioned at a lower side in a gravity direction and so that said exit side tank part is positioned at an upper side in a gravity direction, and   said second heat exchange part is configured to store the second liquid which flows into said inlet side tank part and which is higher in temperature than the liquid inside said exit side tank part in liquid storage parts in said inlet side tank part across the entire stacked direction of said plurality of tubes, then release it to said plurality of tubes.   
     
     
         2 . A vehicular air-conditioning system as set forth in  claim 1 , wherein
 said second heat exchange part is mounted in a vehicle while held in said air-conditioning case in a state so that, when viewing the second heat exchange part from the side, the angle formed by the longitudinal direction of said tubes and the vertical direction forms an acute angle, and   said liquid storage part is formed inside said inlet side tank part in a region above the inlet side end of said tube by making said second heat exchange part slanted.   
     
     
         3 . A vehicular air-conditioning system as set forth in  claim 1 , wherein said liquid storage part is formed by making part of the wall forming said inlet side tank part bulge outside from the other parts. 
     
     
         4 . A vehicular air-conditioning system as set forth in  claim 1 , wherein
 said first heat exchange part comprises a plurality of tubes stacked together, an inlet side tank part which is connected to first end sides of said plurality of tubes in the longitudinal direction and which forms a liquid inlet side, and an exit side tank part which is connected to other end sides of the plurality of tubes in the longitudinal direction and which forms a liquid exit side,   an insertion length of said tubes which are inserted inside of said inlet side tank part of the second heat exchange part is longer than an insertion length of said tubes which are inserted into said inlet side tank part of said first heat exchange part, and   said liquid storage part is formed inside said inlet side tank part of said second heat exchange part in a region above inlet side ends of said tubes in the gravity direction.   
     
     
         5 . A vehicular air-conditioning system as set forth in  claim 1 , wherein
 when projecting an end opening of a liquid introduction path introducing said second liquid to said inlet side tank part of said second heat exchange part in a longitudinal direction of said inlet side tank part, at least part of the end opening of said liquid introduction path is positioned other than right under the inlets of said tubes in the gravity direction.   
     
     
         6 . A vehicular air-conditioning system as set forth in  claim 5 , wherein at least part of the end opening of said liquid introduction path is positioned outside from between two imaginary lines which are drawn from the inside walls of said tubes at the inlet side ends of said tubes in parallel in the gravity direction. 
     
     
         7 . A vehicular air-conditioning system as set forth in  claim 5 , wherein at least part of the end opening of said liquid introduction path is positioned at an upper side from an imaginary line extending in line with the inlet side end faces of said tubes. 
     
     
         8 . A vehicular air-conditioning system as set forth in  claim 5 , wherein a part of 35% or more of the total area of the end opening of said liquid introduction path is positioned other than right under the inlets of said tubes in the gravity direction. 
     
     
         9 . A vehicular air-conditioning system as set forth in  claim 1 , wherein said second heat exchange part is mounted in a vehicle while held in said air-conditioning case in a slanted state so that said second liquid flows from one end side of said inlet side tank part in a longitudinal direction thereof and so that a top wall of said inlet side tank part is positioned with one end side of said inlet side tank part in the longitudinal direction upward in the gravity direction compared with the other end side. 
     
     
         10 . A vehicular air-conditioning system as set forth in  claim 1 , wherein inside said inlet side tank part of said the second heat exchange part, a flow velocity raising means is provided for making the flow velocity of the second liquid flowing to said inlet side tank part rise. 
     
     
         11 . A vehicular air-conditioning system as set forth in  claim 1 , wherein
 said first heat exchange part comprises a     plurality of tubes stacked together, an inlet side tank part which is connected to first end sides of said plurality of tubes in the longitudinal direction thereof and which forms a liquid inlet side, and an exit side tank part which is connected to other end sides of the plurality of tubes in the longitudinal direction and which forms a liquid exit side, and   a channel sectional area of the inlet side tank part of the second heat exchange part is smaller than the channel sectional area of the inlet side tank part of said first heat exchange part.   
     
     
         12 . A vehicular air-conditioning system as set forth in  claim 1 , wherein
 said first heat exchange part comprises a plurality of tubes stacked together, an inlet side tank part which is connected to first end side's of said plurality of tubes in a longitudinal direction thereof and which forms a liquid inlet side, and an exit side tank part which is connected to other end sides of the plurality of tubes in the longitudinal direction and which forms a liquid exit side, and   a channel sectional area of a liquid introduction path which introduces said second liquid to said inlet side tank part of the second heat exchange part is smaller than a channel sectional area of a liquid introduction path which introduces said first liquid to the inlet side tank part of said first heat exchange part.   
     
     
         13 . A vehicular air-conditioning system comprising a heating-use heat exchanger which uses a first liquid and a second liquid with a higher temperature and smaller flow rate than said first liquid as heat sources to heat air blown into a passenger compartment, wherein
 said heating-use heat exchanger comprises a first heat exchange part which exchanges heat between said first liquid and said blown air, and a second heat exchange part which exchanges heat between said second     liquid and said blown air which was heated by said first heat exchange part,   said second heat exchange part comprises a plurality of tubes stacked together, an inlet side tank part which is connected to first end sides of said plurality of tubes in a longitudinal direction thereof and which forms a liquid inlet side, and an exit side tank part which is connected to the other end sides of the plurality of tubes in the longitudinal direction and which forms a liquid exit side,   said second heat exchange part is held in an air-conditioning case so that said inlet side tank part is positioned at a lower side in a gravity direction and so that said exit side tank part is positioned at an upper side in a gravity direction, and   inside of said inlet side tank part, a flow velocity raising means is provided to raise the flow velocity of the second liquid which flows into said inlet side tank part.