JPH03158698A - Header tank constituting body for heat exchanger - Google Patents

Abstract

PURPOSE:To improve sealing ability between a header tank constituting body and a header plate by a method wherein an annular groove is formed in the surface, making close contact with a header plate, of a flange formed on the peripheral edge of an opening part throughout a whole periphery, resilient resin is injected in the annular groove, and a gasket a part of which is protruded from the groove is formed. CONSTITUTION:A header tank 2 comprises a boxform header tank constituting body 10 made of a metal having an out flange 11 for mounting a header plate formed integrally with the peripheral edge of an opening, and a header plate 13 made of a metal closing the opening of the tank constituting body 10. An annular groove 14 is formed in the surface, where the header plate 13 is brought into close contact with a flange 12, of the header constituting body 10 throughout the whole periphery of the flange 12. Resilient resin is injected in the annular groove 14, and a gasket, a part of which is protruded from the groove 14, is formed integrally with the groove. It is preferable that the portion, protruded from the groove, of the gasket 12 is polished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a plastic box-shaped header tank structure for forming a header tank of a heat exchanger used in vehicle radiators, vehicle heaters, and the like.

Prior Art and Problems of the Invention This type of heat exchanger has two header tanks arranged vertically at a predetermined interval, a plurality of header tanks arranged at a predetermined interval left and right between the two header tanks, and each has heat exchange tubes connected to the upper and lower header tanks, and corrugated fins arranged between adjacent heat exchange tubes. The header tank consists of a plastic box-shaped tank structure in which an outward flange for attaching a header plate is integrally formed around the opening periphery, and a tank structure in which the periphery of one side is tightly fixed to the flange via a gasket. It consists of a metal header plate that closes the opening in the body.

An annular groove extending all the way around the flange is formed in the surface of the outward flange of the tank structure that the header plate is brought into close contact with, and an endless gasket formed separately from the flange is fitted and held in the annular groove.

However, gaskets used in conventional heat exchangers need to be tightly fitted and fixed into the annular groove and in close contact with the header plate. Therefore, after forming the gasket into an endless shape using elastic resin, The entire piece is polished and finished before being fitted inside. However, elongation occurs during the polishing process, resulting in variations in finished dimensions. As a result, when such a gasket is fitted into an annular groove, the gasket deforms and gaps are created between the gasket and the circumferential surface of the annular groove and between the gasket and the header plate, from which leakage occurs. There is a risk that this may occur.

An object of the present invention is to provide a header tank structure for a heat exchanger that solves the above problems.

Means for Solving the Problems A header tank structure for a heat exchanger according to the present invention is a header tank in a heat exchanger comprising a box-shaped header tank structure and a header plate that closes an opening of the header tank structure. In the structure, an outward flange for attaching a header plate is integrally formed on the periphery of the opening, and an annular groove extending around the entire circumference of the flange is formed on the surface of the flange to which the header plate is brought into close contact. An elastic resin is injected into the groove, and a gasket is integrally formed with a portion of the gasket protruding outside the groove.

In the above, silicone, ethylene propylene terpolymer, nitrile butadiene rubber, etc. are used as the elastic resin.

Function: The header tank structure for a heat exchanger of the present invention includes an outward flange for attaching a header plate integrally formed on the periphery of the opening, and an annular ring extending around the entire periphery of the flange on the surface of the flange to which the header plate is brought into close contact. A groove is formed, an elastic resin is injected into the annular groove, and a gasket with a part protruding outside the groove is integrally formed, so there is no gap between the gasket and the circumferential surface of the annular groove. can be prevented. Furthermore, even if the portion of the gasket protruding from the annular groove is polished, the gasket will not stretch, and a gap between the gasket and the header plate can be prevented. Therefore, the sealing performance between the header tank structure and the header plate is improved.

Example Embodiments of the invention will be described below with reference to the drawings.

FIG. 2 shows a heat exchanger using the header tank structure of the present invention. In Fig. 2, the heat exchanger (1) consists of two header tanks (2) arranged vertically at a predetermined distance.
, a plurality of heat exchange tubes (3) arranged at a predetermined interval from side to side between both header tanks (2), and whose upper and lower ends are respectively connected to the upper and lower header tanks (2), and adjacent heat exchange tubes. (3) Corrugated fins (4) arranged between the corrugated fins.

As shown in Figure 1, the lower header tank (2) has an outward flange (11) for attaching a header plate around the opening.
) is integrally formed with a plastic box-shaped header tank structure (10), and the peripheral edge of one side is a gasket (12).
), which is closely fixed to the flange (11) to close the opening of the tank structure (lO). An annular groove (14) extending over the entire circumference of the flange (12) is formed on the surface of the outward facing flange (12) for attaching the header plate of the header tank structure (lO) to which the header plate (13) is brought into close contact. (14) Elastic resin is injected into the inside and some grooves (
14) is integrally formed with a gasket (12) protruding from the outside. It is preferable to polish the portion of the gasket (12) that protrudes from the groove, but the polishing is not limited thereto. Although detailed illustration is omitted, the upper header tank (2) also has the same configuration as the lower header tank (2).

The header tank structure (lO) is as shown in FIG.
It is manufactured by injection molding using a cavity mold (20) and a core mold (21). Core mold (21)
At the center of the width of the part forming the flange (12) in the cavity mold (20) of the core mold (21)
An annular recess (22) forming a portion protruding from the annular groove (14) of the gasket (12) is formed on the surface facing toward the entire circumference.

In addition, in a portion of the core mold (21) corresponding to the four portions (22) forming the flange (12), there is an elastic resin filling port (23) with one end opening into the four portions (22).
are formed. And the header tank structure (
In manufacturing the gasket-forming core (24), first, the annular groove-forming core (24) is placed in the gasket-forming four-part (22) so that a portion thereof protrudes outward from the four-part (22). The elastic resin filling port (23) is closed by this core (24) (see FIG. 3(a)). Next, a plastic material (not shown) is injected and filled into the cavity (25), and is cooled and solidified to form a flange (11) around the opening.
and an annular groove (14) in the flange (11).
Create a box-like body with . Then, the core mold (21) is removed and the core (24) is removed. After that, the core mold (2
1) is returned to its original position, elastic resin is injected from the elastic resin filling port (23), and by cooling and solidifying it, the elastic resin is injected into the annular groove (14) and a part of it fills the groove (14). An outwardly projecting gasket (12) is integrally formed. In this way, the header tank structure (10) is manufactured (see FIG. 3(b)).

Effects of the Invention According to the header tank structure for a heat exchanger of the present invention, as described above, it is possible to prevent a gap from forming between the gasket and the circumferential surface of the annular groove, and also to prevent the formation of a gap between the gasket and the header plate. This will prevent gaps from forming. Therefore, the sealing performance between the header tank structure and the header plate can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway partial perspective view showing an enlarged part of a heat exchanger using a header tank structure according to the present invention;
Fig. 2 is a partially omitted perspective view showing the overall structure of a heat exchanger using the header tank structure according to the present invention;
The figures are partially enlarged vertical sectional views showing the method of manufacturing a header tank structure according to the present invention in the order of steps. (lO)...Header tank structure, (11)...Outward flange for mounting header plate, (12)...Gasket, (13)...Header plate, (14)...
...Annular groove. that's all

Claims (1)

[Claims] A header tank structure in a heat exchanger equipped with a header tank consisting of a box-shaped header tank structure and a header plate that closes an opening of the header tank structure, the header tank structure having an outward flange for attaching the header plate on the periphery of the opening. is integrally formed, an annular groove is formed around the entire circumference of the flange on the surface of the flange that the header plate is brought into close contact with, and an elastic resin is injected into the annular groove so that a part of the gasket protrudes outside the groove. A header tank structure for a heat exchanger that is integrally formed.