Heat exchanger

Patent metadata

Field	Value
Publication number	US-10184733-B2
Application number	US-201514979404-A
Country	US
Kind code	B2
Filing date	Dec 27, 2015
Priority date	Feb 4, 2015
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A heat exchanger includes: a first flow passage where first liquid flows; a second flow passage where second liquid flows; and a heat exchanger main body configured to exchange heat between the first liquid and the second liquid. The heat exchanger main body includes a cross-sectional area adjuster configured to change a flow passage cross-sectional area of at least one of the first flow passage and the second flow passage by thermal deformation. The cross-sectional area adjuster adjusts a value of the flow passage cross-sectional area in a low temperature range to be larger than a value of the flow passage cross-sectional area in a high temperature range.

First claim

What is claimed is:

1. A heat exchanger, comprising:
a first flow passage where first liquid flows;
a second flow passage where second liquid flows, the first flow passage being separated from the second flow passage by a separator; and
a heat exchanger main body configured to exchange heat between the first liquid and the second liquid, the heat exchanger main body including a cross-sectional area adjuster configured to change a flow passage cross-sectional area of each of the first flow passage and the second flow passage by thermal deformation, the cross-sectional area adjuster adjusting a value of the flow passage cross-sectional area in a low temperature range to be larger than a value of the flow passage cross-sectional area in a high temperature range, wherein
the cross-sectional area adjuster includes a first fin in the first flow passage and the first fin is connected to the separator and to a wall of the first flow passage opposite to the separator,
the cross-sectional area adjuster includes a second fin in the second flow passage and the second fin is connected to the separator and to a wall of the second flow passage opposite to the separator,
a decrease rate of kinetic viscosity, which is a decrease rate of a value of kinetic viscosity in a high temperature range relative to a value of kinetic viscosity in the low temperature range, of the second liquid is smaller than a decrease rate of kinetic viscosity of the first liquid, and
the cross-sectional area adjuster adjusts a value of a decrease rate of the cross-sectional area, which is a decrease rate of the flow passage cross-sectional area in the high temperature range relative to the flow passage cross-sectional area in the low temperature range, of the first flow passage to be larger than a value of a decrease rate of the cross-sectional area of the second flow passage.

2. The heat exchanger according to claim 1 , further comprising:
a bypass flow passage configured to flow the first liquid by bypassing the first flow passage; and
a second cross-sectional area adjuster provided at the bypass flow passage, and configured to adjust a flow passage cross-sectional area of the bypass flow passage in the high temperature range to be smaller than a flow passage cross-sectional area of the bypass flow passage in the low temperature range.

3. The heat exchanger according to claim 1 , wherein
at least one of the first fin and the second fin contains mercury or polyethylene as a material.

4. The heat exchanger according to claim 1 , wherein the cross-sectional area adjuster is configured to change the flow passage cross-sectional area of the first flow passage and the second flow passage by thermal deformation.

5. The heat exchanger according to claim 1 , wherein a flow direction of the first flow passage is orthogonal to a direction of the second flow passage.

6. The heat exchanger according to claim 1 , wherein the separator is a partitioning member that exchanges heat between the first flow passage and the second flow passage.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tominaga Satoshi
• Tokozakura Daisuke
• Shiina Takahiro
• Arakawa Kazuya
• Takayama Hitoshi
• Ichige Keisuke
• Iritani Masanori

Classifications

• F28F13/04

  by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation {(F28F13/18 takes precedence)} · CPC title

• F28F13/08 Primary

  by varying the cross-section of the flow channels · CPC title

• F28F13/06

  by affecting the pattern of flow of the heat-exchange media {(F28F13/003 takes precedence; static flow control means in header boxes F28F9/026)} · CPC title

• F28F27/02

  for controlling the distribution of heat-exchange media between different channels ({static flow control means in header boxes F28F9/026}; arrangements of guide plates or guide vanes F28F9/22, F28F25/12) · CPC title

• F28D2021/0089

  Oil coolers · CPC title