Zexel Gmbh

Valeo Thermal Systems Japan Corporation

Kiyoshi Tanda

Kunihiko Nishishita

Seiji Inoue

Hitoshi Sakata

Naoto Hayashi

Ryoichi Kataoka

Mitsuhiko Akahoshi

A heat exchangerincludes at least a plurality of tubesand an upper tankcommunicating with an upper end portion of a tube group formed by the tubesso as to distribute coolant along the up/down direction. The coolant flows in through an inflow portlocated at the upper tankin the heat exchanger. An open-top coolant intake guide passageis disposed at the inflow portand the coolant intake guide passageis thus inserted at the upper tank. With this configuration, coolant flowing at a very low flow rate has improved distribution, and uniformity in the output air temperature is achieved, while ensuring that the structure does not create excessive resistance against the coolant flow at a high flow rate.

Heat exchanger

In a laminated heat exchanger with a pair of tank portions formed at one side of each tube element and intake/outlet portions for heat exchanging medium provided at one end in the direction of the lamination or in the direction running at a right angle to the direction of the lamination, a constricting portion for limiting the flow passage cross section is provided in an area in the tank portions where the flow shifts from an even-numbered pass to an odd-numbered pass in a plurality of passes. This allows the heat exchanging medium to flow in sufficient quantities into the tube elements near the outlet side of the partitioning portion, preventing inconsistency in temperature distribution. This constricting portion, which is formed in the tank group opposite the tank group where the partitioning portion is provided, is provided at the same lamination position as the partitioning portion. The constricting portion may be also formed with a plurality of holes. Thus, by ensuring that heat exchanging medium flows in an even, consistent manner, an improvement in heat exchanging efficiency is achieved.

Laminated heat exchanger

In a laminated heat exchanger with a pair of tank portions formed at one side of each tube element and intake/outlet portions for heat exchanging medium provided at one end in the direction of the lamination or in the direction running at a right angle to the direction of the lamination, a constricting portion for limiting the flow passage cross section is provided in an area in the tank portions where the flow shifts from an even-numbered pass to an odd-numbered pass in a plurality of passes. This allows the heat exchanging medium to flow in sufficient quantities into the tube elements near the outlet side of the partitioning portion, thereby avoiding inconsistency in temperature distribution. This constricting portion, which is formed in the tank group opposite the tank group where the partitioning portion is provided, is provided at the same lamination position as the partitioning portion. The constricting portion may be also formed with a plurality of holes. Thus, by ensuring that heat exchanging medium flows in an even, consistent manner, an improvement in heat exchanging efficiency is achieved.

Growing community of inventors

Konan, Japan

Kiyoshi Tanda