Refrigerant evaporator

Patent metadata

Field	Value
Publication number	US-10161659-B2
Application number	US-201414890689-A
Country	US
Kind code	B2
Filing date	May 16, 2014
Priority date	May 20, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A first evaporation unit and a second evaporation unit are coupled via a refrigerant interchanging portion having a first communication portion and a second communication portion. A first partition member is provided in a tank portion of the first evaporation unit to define a first tank internal space and a second tank internal space. The first partition member has a first communication hole to let the first tank internal space and the second tank internal space communicate with each other. A second partition member is provided in a tank portion of the second evaporation unit to define a third tank internal space and a fourth tank internal space. The second partition member has a second communication hole to let the third tank internal space and the fourth tank internal space communicate with each other.

First claim

What is claimed is:

1. A refrigerant evaporator that exchanges heat between fluid flowing outside to be cooled and refrigerant, comprising
a first evaporation unit and a second evaporation unit disposed in series in a flow direction of the fluid, wherein:
each of the first evaporation unit and the second evaporation unit has
a heat-exchanging core portion in which a plurality of tubes are stacked, the refrigerant flowing through the plurality of tubes, and
a pair of tank portions connected to both ends of the plurality of tubes to collect or distribute the refrigerant flowing inside the plurality of tubes;

the heat-exchanging core portion of the first evaporation unit has a first core portion defined by a part of the plurality of tubes of the first evaporation unit and a second core portion defined by a rest of the plurality of tubes of the first evaporation unit;
the heat-exchanging core portion of the second evaporation unit has a third core portion defined by a part of the plurality of tubes of the second evaporation unit opposing at least a part of the first core portion in the flow direction of the fluid and a forth core portion defined by a rest of the plurality of tubes of the second evaporation unit opposing at least a part of the second core portion in the flow direction of the fluid;
of the pair of tank portions of the first evaporation unit, one tank portion includes a first refrigerant collection portion to collect the refrigerant from the first core portion and a second refrigerant collection portion to collect the refrigerant from the second core portion;
of the pair of tank portions of the second evaporation unit, one tank portion includes a first refrigerant distribution portion to distribute the refrigerant to the third core portion and a second refrigerant distribution portion to distribute the refrigerant to the fourth core portion;
the first evaporation unit and the second evaporation unit are coupled via a refrigerant interchanging portion having a first communication portion that introduces refrigerant from the first refrigerant collection portion to the second refrigerant distribution portion and a second communication portion that introduces refrigerant from the second refrigerant collection portion to the first refrigerant distribution portion;
the first evaporation unit has a refrigerant inlet portion through which refrigerant is introduced into the other tank portion of the first evaporation unit at an end of the other tank portion in a stacking direction of the tubes;
the other tank portion of the first evaporation unit includes a dam portion to stop a flow of liquid phase refrigerant that has flowed into the other tank portion from the refrigerant inlet portion; and
the dam portion is located at a position so as to overlap a boundary between the third core portion and the fourth core portion of the second evaporation unit when viewed in the flow direction of the fluid; wherein
the dam portion is defined by a disc plate, and an outer peripheral surface of the disc plate is bonded to an inner peripheral surface of the other tank portion of the first evaporation unit,
the disc plate has
a through-hole disposed on an upper side of a center portion of the disc plate in a longitudinal direction of the tubes,
the dam portion defined by a lower side of the through-hole to stop the flow of liquid phase refrigerant, and
a protrusion portion defined by an upper side of the through-hole to drop the liquid phase refrigerant scattered when flowing inside from the refrigerant inlet portion.

2. The refrigerant evaporator according to claim 1 , wherein:
the disc plate is disposed to protrude from a lower side of the inner peripheral surface of the other tank portion adjacent to the heat-exchanging core portion of the first evaporation unit.

3. The refrigerant evaporator according to claim 1 , wherein:
the other tank portion of the first evaporation unit has an upper side of the inner peripheral surface opposite to the heat-exchanging core portion through longitudinal ends of the plurality of tubes of the first evaporation unit, and the upper side of the inner peripheral surface includes the protrusion portion protruding toward the heat-exchanging core portion; and
the protrusion portion is disposed at a position so as to overlap the boundary between the third core portion and the fourth core portion of the second evaporation unit when viewed in the flow direction of the fluid.

4. The refrigerant evaporator according to claim 1 , wherein:
the first evaporation unit and the second evaporation unit are disposed in such a manner that a longitudinal direction of the tube crosses a horizontal direction.

5. A refrigerant evaporator that exchanges heat between fluid flowing outside to be cooled and refrigerant, comprising
a first evaporation unit and a second evaporation unit disposed in series in a flow direction of the fluid, wherein:
each of the first evaporation unit and the second evaporation unit has
a heat-exchanging core portion in which a plurality of tubes are stacked, the refrigerant flowing through the plurality of tubes, and
a pair of tank portions connected to both ends of the plurality of tubes to collect or distribute the refrigerant flowing inside the plurality of tubes;

the heat-exchanging core portion of the first evaporation unit has a first core portion defined by a part of the plurality of tubes of the first evaporation unit and a second core portion defined by a rest of the plurality of tubes of the first evaporation unit;
the heat-exchanging core portion of the second evaporation unit has a third core portion defined by a part of the plurality of tubes of the second evaporation unit opposing at least a part of the first core portion in the flow direction of the fluid and a forth core portion defined by a rest of the plurality of tubes of the second evaporation unit opposing at least a part of the second core portion in the flow direction of the fluid;
of the pair of tank portions of the first evaporation unit, one tank portion includes a first refrigerant collection portion to collect the refrigerant from the first core portion and a second refrigerant collection portion to collect the refrigerant from the second core portion;
of the pair of tank portions of the second evaporation unit, one tank portion includes a first refrigerant distribution portion to distribute the refrigerant to the third core portion and a second refrigerant distribution portion to distribute the refrigerant to the fourth core portion;
the first evaporation unit and the second evaporation unit are coupled via a refrigerant interchanging portion having a first communication portion that introduces refrigerant from the first refrigerant collection portion to the second refrigerant distribution portion and a second communication portion that introduces refrigerant from the second refrigerant collection portion to the first refrigerant distribution portion;
the first evaporation unit has a refrigerant inlet portion through which refrigerant is introduced into the other tank portion of the first evaporation unit at an end of the other tank portion in a stacking direction of the tubes;
the other tank portion of the first evaporation unit includes a dam portion to stop a flow of liquid phase refrigerant that has flowed into the other tank portion from the refrigerant inlet portion; and
the dam portion is located at a position so as to overlap a boundary between the third core portion and the fourth core portion of the second evaporation unit when viewed in the flow direction of the fluid, wherein
the dam portion is defined by a boundary tube that is only one of the tubes of the first evaporation unit disposed at a position nearest to the boundary, and
an upper end of the boundary tube

Assignees

• Denso Corp

Inventors

• Ishizaka Naohisa
• Nishino Tatsuhiko
• Chatani Shota

Classifications

• F28D1/05391

  with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators · CPC title

• F25B39/00 Primary

  Evaporators; Condensers · CPC title

• F28F9/0265

  by using guiding means or impingement means inside the header box · CPC title

• F25B39/02 Primary

  Evaporators · CPC title

• F28D2021/0071

  Evaporators · CPC title