Heat exchange – Three non-communicating fluids
Reexamination Certificate
1999-02-08
2001-10-23
Leo, Leonard (Department: 3743)
Heat exchange
Three non-communicating fluids
C165S135000, C165S175000
Reexamination Certificate
active
06305465
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application relates to and claims priority from Japanese Patent Applications No. Hei. 10-42303 filed on Feb. 24, 1998 and No. Hei. 10-196018 filed on Jul. 10, 1998, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a double heat exchanger having several core portions such as a condenser core for a refrigerant cycle and a radiator core for cooling engine cooling water of a vehicle.
2. Related Art
In a conventional double heat exchanger having a condenser core and a radiator core, a condenser header tank and a radiator header tank are disposed to be close to each other to reduce the size of the double heat exchanger. When the condenser and the radiator header tanks are respectively assembled to the condenser and radiator cores, the condenser and radiator header tanks tends to be inclined. Therefore, in this case, the condenser and radiator header tanks may contact to each other in a relatively large area, and may be bonded to each other through brazing. As a result, heat transfers from the radiator header tank to the condenser header tank, thereby decreasing heat exchange performance of the condenser core of the double heat exchanger.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide a double heat exchanger having a first and second cores, which prevents a first header tank connected to the first core and a second header tank connected to the second core from being inclined while improving heat exchange performance.
According to the present invention, in a double heat exchanger having a first core and a second core, a first header tank connected to the first core has a protruding portion protruding toward a second header tank connected to the second core, and the protruding portion of the first header contacts the second header tank. Therefore, the first and second header tanks are prevented from being inclined toward each other, thereby preventing the first and second header tanks from contacting and being brazed to each other in a large area. Thus, heat conduction between the first and second header tanks is restricted, and heat exchanger performance of the double heat exchanger is improved.
Preferably, at least three protrusions are separately formed on the first header tank along a longitudinal direction of the first header tank. Therefore, the double heat exchanger prevents the first and second header tanks from being inclined without greatly reducing the heat exchange performance.
Further, a total of each length of each contact surface between the protrusions of the first header tank and the second header tank in a longitudinal direction of the second header tank is set to be equal to 50% or less of an entire longitudinal length of the second header tank. Even in this case, the double heat exchanger can prevent the heat exchange performance from being greatly reduced.
More preferably, the first header tank is composed of a first plate and a first tank portion. The first plate has a clamping portion and the protruding portion is formed on the first tank portion. When the first tank portion is connected to the first plate of the first header tank, the clamping portion of the first plate is bent in the longitudinal direction of the first header tank to clamp the protruding portion. Thus, the first plate and the first tank portion of the first header tank can be readily assembled.
Still more preferably, the second header tank is composed of a second plate and a second tank portion connected to the second plate, each of the second plate and the second tank portion is formed into a L-shaped cross-section to have a bending portion extending in a longitudinal direction of the second header tank, and the bending portion of the second plate is arranged at a side adjacent to the first header tank to face the first header tank. Therefore, the second plate and the second tank portion of the second header tank can be readily assembled, and connection portions of the second header tank can be readily checked.
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Muto Satomi
Sakane Takaaki
Sugimoto Tatsuo
Uchikawa Akira
Denso Corporation
Harness Dickey & Pierce PLC
Leo Leonard
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