JPH0531421Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The invention relates to a heat exchanger, particularly a heat exchanger formed by laminating a large number of plates and transferring heat between cooling water and oil.

Conventional technology For example, Utility Model Application Publication No. 144379/1983 or Japanese Patent Application Publication No. 61/1989
As shown in Japanese Patent No. 223213, a plate-type oil cooler manufactured by laminating and brazing a large number of plates is known. Although not publicly known, Utility Application No. 199103 (Sho 63-109865) currently pending.
No. 4) An oil cooler of the same type as described in the specification and drawings will be explained with reference to FIG. FIG. 4 is a sectional view of a conventional oil cooler.

A known oil cooler 30 used as a heat exchanger is also called a housingless type oil cooler, and includes a core 32 formed by laminating and brazing a large number of plates 31, and an upper part fixed to the upper part of the core 32. It has a plate 33 and a cover 34 fixed to the lower part of the core 32. Depending on the type of heat exchanger, an oil filter is fixed to the upper part of the upper plate 33, and a connector pipe is inserted into the center hole of the core 32 as is known (not shown).

The core 32 includes a first passage 35 through which a first fluid passes, a first heat exchange chamber 36 communicating with the first passage 35, and a second passage 37 through which a second fluid passes.
and a second heat exchange chamber 3 communicating with the second passage 37
8. For example, the first fluid is oil heated within the engine, and the second fluid is cooling water cooled by a radiator.

In the above configuration, the first fluid flows from the inlet through the first heat exchange chamber 36 and the first passage 35 to the outlet. Further, the second fluid flows out from the inlet through the second heat exchange chamber 38 and the second passage 37 to the outlet 39. The first heat exchange chamber 36 and the second heat exchange chamber 38 are adjacent to each other with the plate 31 in between, and the first fluid in the first heat exchange chamber 36 and the second fluid in the second heat exchange chamber 38 are adjacent to each other with the plate 31 in between. Heat exchange occurs between the two fluids.
A housing-less type oil cooler is used as a water-cooled oil cooler for cooling lubricating oil or hydraulic oil of an automobile engine, and has the advantage of having a simple structure and being manufactured at low cost.

A cover 34 fixed to the lower part of the core 32 forms a fluid passageway for guiding the first fluid and the second fluid. Conventionally, the cover 34 is press-molded or made of corrosion-resistant metal such as stainless steel or aluminum.
Manufactured by forging or casting.

Problems to be Solved by the Invention In the conventional heat exchanger, the cover 34 is molded from a metal material, so the heat exchanger is heavy and cannot be transported in large quantities, making it inconvenient to handle. In particular, when used as a heat exchanger for an automobile, it is necessary to reduce the weight of the heat exchanger in order to reduce fuel consumption, but conventionally it has not been possible to reduce the weight of the cover 34. Moreover, the metal cover 34 conventionally used is expensive. In addition, a metal cover 34
The joint with the core 32 must be kept liquid-tight to prevent fluid leakage. Therefore, it is necessary to separately install a sealing material between the core 32 and the cover 34, or to tighten the gap between the core 32 and the cover 34 by brazing, bolting, etc., or caulking. Therefore, the manufacturing time is long and the manufacturing cost is high. Furthermore, metal cover 3
No. 4 requires surface treatment in order to maintain corrosion resistance, but if the surface treatment is not performed uniformly, corrosion will occur partially.

Furthermore, the cover 34 must be formed with separate pipes for fluid inlets and outlets.

The purpose of this invention is to solve the above problems and provide a lightweight housing-less heat exchanger by molding the cover from synthetic resin.

Means for Solving the Problems The heat exchanger of this invention has a core and a cover fixed to the lower part of the core, and the core is formed by laminating a number of plates and then brazing them. a first passage through which the first fluid passes, a first heat exchange chamber communicating with the first passage, and a second passage through which a second fluid exchanges heat with the first fluid. In a heat exchanger having a passage and a second heat exchange chamber communicating with the second passage, a flange portion protruding in the radial direction is provided at the lower part of the core, and the first passage or the second passage is connected to the second passage. It has a structure in which the cover having a third passage communicating with one side is fixed to the flange portion using synthetic resin.

Function The cover has a liquid-tight molded structure of synthetic resin at the bottom of the core, completely preventing fluid from leaking between the cover and the core.

Embodiment Hereinafter, an embodiment of this invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the heat exchanger 10 of this invention
has a core 11 and a cover 12 fixed to the bottom of the core 11. The core 11 is formed by laminating a large number of plates 11a and then brazing them. Although not shown in detail, the core 11, like the conventional core, includes a first passage through which the first fluid passes, a first heat exchange chamber communicating with the first passage, and a first heat exchange chamber in which the first fluid passes. It has a second passage through which a second fluid for heat exchange is passed, and a second heat exchange chamber communicating with the second passage. The cover 12 is made of synthetic resin such as FRP or nylon and is molded by injection molding. A radially projecting flange portion 13 is provided at a lower portion of the core 11. The flange portion 13 has a downwardly inclined portion 13a and an annular rim 13b extending further outward from the sloped portion 13a. The cover 12 is molded from synthetic resin so as to be engaged with the inclined portion 13a and the annular rim 13b of the flange portion 13. For this reason, cover 1
An annular projection 12a is formed on the side surface of 2.

The cover 12 has a third passage 1 that communicates with either the first passage or the second passage provided in the core 11.
It has 4. The third passage 14 is used, for example, as a cooling water passage. Above the third passage 14 is a hole 15 in the lower plate 11a of the core 11.
A downwardly projecting annular projection 16 is formed around the hole 15. A rubber seal member 17 is provided around the annular projection 16.

During molding, the plate is assembled by charging the brazing material in a predetermined position, and then heated and cooled in a heating furnace.
Core 11 is manufactured by brazing at predetermined positions.
Next, a rubber sealing member 17 is attached around the annular projection 16, the core 11 is mounted in a mold (not shown), and the cover 12 is molded under the core 11. Actually, the cover 12 is supported upside down by being held between the top and side surfaces of the cover 12 and the mold,
Molten resin is press-fitted into the mold cavity and solidified. By this method, the synthetic resin is attached to the outside from the part adjacent to the flange part 13, and the cover 1 is
form 2.

The third passage 14 provided within the cover 12 is
For example, it is molded using a thermofusible core called a melting core. The molten core is made of a metal with a low melting point and is formed into a predetermined L-shape, and is supported within the cavity by a mold. After the molten resin is press-fitted into the cavity and solidified, the molded product is taken out together with the molten core. Thereafter, the molded product is heated to elute the low melting point molten core from the resin molded product. In addition to the molten core, a removable flexible material made of synthetic resin or the like may also be used after the cover 12 is formed.

FIG. 2 is a partial sectional view showing another embodiment of this invention. In this example, an annular metal reinforcing member 18 is fixed to a plate 11a provided at the bottom of the core 11 by brazing.

FIG. 3 is a partial cross-sectional view showing another embodiment of this invention. In this example, an annular sleeve 19 forming a third passage 14 is fixed to a plate 11a provided at the lowest part of the core 11 by brazing or the like. When the overall length of the annular sleeve 19 is short, it is possible to simultaneously form the annular sleeve 19 integrally by press molding the lowermost plate 15. The annular sleeve 16 abuts against the rod 20 of the mold when the cover 12 is molded to prevent leakage of molten resin.

Effects of the Invention As described above, in the heat exchanger of this invention, the cover has a structure in which the cover is liquid-tightly molded with synthetic resin at the lower part of the core. Therefore, the heat exchanger can be manufactured extremely lightweight and relatively inexpensively. Incidentally, the heat exchanger of this invention can reduce the weight by about 10 to 30% compared to conventional heat exchangers. Therefore, when used as a heat exchanger for automobile oil, it is possible to reduce the weight and reduce fuel consumption. Furthermore, since the synthetic resin forming the cover is in close contact with the lower part of the core, it is possible to completely prevent fluid from leaking between the cover and the core. For this reason, as in the past,
Installing a sealing material between the core and cover,
There is no need to tighten the core and cover by soldering, bolts, etc., or by caulking. Furthermore, since there is no need to perform surface treatment on the cover, local corrosion that would otherwise occur if surface treatment is not uniformly performed does not occur. Furthermore, conventionally, the inlet and outlet for fluids were formed as separate pipes and attached to the cover, but with this idea, the pipes that form the inlet and outlet attached to the cover can also be formed integrally with the cover. . Thus, this invention has extremely high practical value when used in heat exchangers.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat exchanger according to this invention, Fig. 2 is a partial sectional view showing another embodiment of this invention, and Fig. 3 is a partial sectional view showing yet another embodiment of this invention. , FIG. 4 is a sectional view of a conventional oil cooler. DESCRIPTION OF SYMBOLS 11... Core, 12... Cover, 13... Flange part, 13a... Inclined part, 13b... Annular rim, 14... Third passage.

Claims (1)

[Claims for Utility Model Registration] (1) It has a core and a cover fixed to the lower part of the core, and the core is formed by laminating a large number of plates and then brazing them together, and A first passage through which a fluid passes, a first heat exchange chamber communicating with the first passage, a second passage through which a second fluid that exchanges heat with the first fluid passes, and the second passage. A heat exchanger having a second heat exchange chamber that communicates with one of the first passage and the second passage, wherein a flange portion that projects in the radial direction is provided at the lower part of the core, and a second heat exchange chamber that communicates with one of the first passage and the second passage. A heat exchanger characterized in that the cover having three passages is formed by being locked to the flange portion using synthetic resin. (2) The heat exchanger according to claim (1), wherein the flange portion has a downwardly inclined portion.