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Heat exchanger

a heat exchanger and heat exchanger technology, applied in the direction of indirect heat exchangers, lighting and heating apparatus, stationary conduit assemblies, etc., can solve the problems of deterioration affecting so as to improve the durability of the heat exchanger and reduce the thermal stress difference

Inactive Publication Date: 2009-05-21
CALSONIC KANSEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to an aspect of the present invention there is provided a heat exchanger, in which flowing medium flows, including a first tank, a second tank, a core part and a flow accelerating means. The first tank is provided with an inlet port, and the second tank is disposed apart from the first tank. The core part has a plurality of tubes and a plurality of fins, the tubes having both end portions being fluidically connected with the first tank and the second tank, respectively, and each of the fins being arranged between the adjacent tubes. The flow accelerating mean is provided inside the first tank so as to accelerate a flow speed of the flowing medium, which enters an inner space of the first tank through the inlet port, in the first tank in a longitudinal direction of the first tank.
[0011]Therefore, the heat exchanger of the present invention can decrease thermal stress differences of a tank and a core part, thereby improving durability of the heat exchanger.

Problems solved by technology

The above known conventional heat exchanger, however, encounters a problem in that durability of the heat exchanger is deteriorated due to thermal stress caused because of the following reasons.
It takes a long time for the high-temperature flowing medium to reach the far-away portion and replace the low-temperature flowing medium existing there.
It further causes a notable temperature difference among the tubes according to their locations.
Consequently, different thermal expansions thereof are generated among the tubes to deteriorate the durability of the heat exchanger.

Method used

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Experimental program
Comparison scheme
Effect test

first embodiment

[0044]The operation and effects of the radiator 1 of the first embodiment will be described.

[0045]The high-temperature flowing medium, which enters the right tank 2 through the inlet port 13, is cooled down due to heat exchanger between the flowing medium and an air flow generated by the motor vehicle running (and / or an air flow generated by a motor fan), while it flows to the left tank 3 through the tubes 7 of the core part 4. The low-temperature flowing medium in the left tank 3 is discharged through the outlet port 10 to be supplied to the object. The flowing medium cooled down the object, and then returns to the inlet port 13 of the radiator 1 to circulate in this cooling circuit.

[0046]In this operation, after the high-temperature flowing medium enters the inner space of the right tank 2 through the inlet port 13, its flow speed is accelerated, because it is guided by the rim portion 18 to flow through the front side passage 19, of the right tank 2, that the first rib portion 18...

second embodiment

[0056]In the radiator of the second embodiment, high-temperature flowing medium entering the front side passage 19 through the inlet port increases its flow speed due to a narrow flow area thereof to swiftly flow to a top portion and a bottom portion of the inner space of the right tank 2, being mixed up with low-temperature flowing medium existing in the front side passage 19 in a short time. Then the flowing medium flow to a left tank through all of not-shown tubes used for a core part at approximately uniform temperature.

[0057]On the other hand, the low-temperature flowing medium in the chambers 31-37 is mixed up with the high-temperature, flowing medium flowing through the front side passage 19, via a clearance formed between tip portions of the first and second rib portions 18 and 30 and the wall portion formed by a not-shown tube plate. In this mix-up state, the second rib portions 30 obstruct the low-temperature flowing medium to flow in the longitudinal direction of the righ...

third embodiment

[0060]Next, the present invention will be described.

[0061]As shown in FIG. 9, in a radiator of the third embodiment, the heights of a first rib portion 18 and first-rib-portion side portions of second rib portions 30 are set to be lower than those of the second embodiment. The other parts are constructed similarly to those of the first embodiment.

[0062]Therefore, the radiator of the third embodiment can provide the following effect in addition to those of the second embodiment.

[0063]The first rib portion 18 and the portions of the second rib portions 30 are formed lower, which can simplify a shaping die for a tank formed by using resin mold, thereby saving a cost of the shaping die.

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Abstract

A heat exchanger, in which flowing medium flows, includes a first tank, a second tank, a core part and a flow accelerating means. The first tank is provided with an inlet port, the second tank being disposed apart from the first tank. The core part has a plurality of tubes and a plurality of fins. The tubes have both end portions being fluidically connected with the first tank and the second tank, respectively. Each of the fins is arranged between the adjacent tubes. The flow accelerating mean is provided inside the first tank so as to accelerate a flow speed of the flowing medium, which enters an inner space of the first tank through the inlet port, in the first tank in a longitudinal direction of the first tank.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a heat exchanger using cooling flowing medium that runs through tubes fluidically connected between tanks.[0003]2. Description of the Related Art[0004]A conventional heat exchanger is disclosed in Japanese Patent Application laid-open publication No. 2007-107799. This conventional heat exchanger includes a pair of long tanks, a plurality of tubes and a plurality of fins. The tanks are arranged apart from each other in a vertical direction, where an upper one of them is provided with an inlet port and a lower one thereof is provided with an outlet port. The tubes are disposed between the tanks, both end portions of the tubes being inserted into and fixed to the tanks, respectively. This enables flowing medium, such as coolant, to flow into the upper tank through the inlet port and then flow to the lower tank through the tubes, finally being discharged through the outlet port from the lowe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28D1/04
CPCF28F9/0204F28F9/0268F28F9/0263
Inventor SANNOHE, KOJI
Owner CALSONIC KANSEI CORP