Heat exchanger

Patent metadata

Field	Value
Publication number	US-2016223274-A1
Application number	US-201514979404-A
Country	US
Kind code	A1
Filing date	Dec 27, 2015
Priority date	Feb 4, 2015
Publication date	Aug 4, 2016
Grant date	—

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; 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 at least one 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.

2 . The heat exchanger according to claim 1 , wherein
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 a low temperature range of the second liquid, is smaller than the decrease rate of kinetic viscosity of the first liquid, the cross-sectional area adjuster changes at least the flow passage cross-sectional area of the first flow passage, and the cross-sectional area adjuster adjusts a value of a decrease rate of a cross-sectional area, which is a decrease rate of the flow passage cross-sectional area in a high temperature range relative to the flow passage cross-sectional area in a low temperature range of the first flow passage, to be larger than a value of the decrease rate of the cross-sectional area of the second flow passage.

3 . 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 a high temperature range to be smaller than a flow passage cross-sectional area of the bypass flow passage in a low temperature range.

4 . The heat exchanger according to claim 2 , 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 a high temperature range to be smaller than a flow passage cross-sectional area of the bypass flow passage in a low temperature range.

5 . The heat exchanger according to claim 1 , wherein
the cross-sectional area adjuster includes a first fin disposed in the first flow passage and a second fin disposed in the second flow passage, and at least one of the first fin and the second fin contains mercury or polyethylene as a material.

6 . The heat exchanger according to claim 2 , wherein
the cross-sectional area adjuster includes a first fin disposed in the first flow passage and a second fin disposed in the second flow passage, and at least one of the first fin and the second fin contains mercury or polyethylene as a material.

7 . The heat exchanger according to claim 3 , wherein
the cross-sectional area adjuster includes a first fin disposed in the first flow passage and a second fin disposed in the second flow passage, and at least one of the first fin and the second fin contains mercury or polyethylene as a material.

8 . The heat exchanger according to claim 4 , wherein
the cross-sectional area adjuster includes a first fin disposed in the first flow passage and a second fin disposed in the second flow passage, and at least one of the first fin and the second fin contains mercury or polyethylene as a material.

Assignees

• Toyota Motor Co Ltd

Inventors

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

Classifications

• F28F2250/06

  Derivation channels, e.g. bypass · CPC title

• F28F21/067

  Details · CPC title

• F28F3/02

  Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations (F28F3/08 takes precedence) · CPC title

• F28D2021/0089

  Oil coolers · CPC title

• 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