JP2000018872A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type heat exchanger having easy assembling property and a high pressure resistance. SOLUTION: A pair of trapezoidal protrusions 7 each having small fin stopper and reinforcement are projected on its inner surface side at a boundary between both ends of a flat channel 3 of a slender plate 4 and a manifold 2. When the pair of the plates 4 are superposed in a reverse direction, protruding end faces of the protrusions 7 are connected to one another. An inner fin 5 is disposed between the pair of the protrusions 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate type heat exchanger used for an oil cooler for a vehicle, which is easy to assemble and has high pressure resistance.

[0002]

2. Description of the Related Art In a plate type heat exchanger, each plate is formed into an elongated dish shape by press molding, and a pair of communicating holes aligned with each other are formed at both ends thereof. Bulges outward in the thickness direction to form a manifold portion. At the same time, a groove-shaped flat flow path shallower than the depth is formed between both manifold portions. Such a pair of plates are overlapped in the opposite direction, an inner fin is provided inside, an element is formed, and a plurality of elements are stacked to complete a plate heat exchanger.

[0003]

In the conventional plate type heat exchanger element, the peripheral edges of the respective plates are aligned with each other, and the internal flat flow passages are brazed and fixed via inner fins. The pressure resistance of the brazed portion is relatively high. However, the boundary portion between the manifold portion and the flat flow passage formed on the periphery of the communication hole has a disadvantage that the pressure resistance is relatively weak because there is no brazing portion. Further, although the plate heat exchanger is assembled by stacking the respective components, the inner fin and the plate may move in the longitudinal direction during assembly or brazing, and may be displaced. Therefore, an object of the present invention is to solve these problems.

[0004]

In the plate heat exchanger of the present invention, a pair of communicating holes 1 aligned with each other at both ends are formed, and the edge of the communicating hole 1 is formed in the thickness direction. Bulge outward to form a pair of manifold portions 2 and
It has a plurality of elongated plates 4 in which flat flow channels 3 are formed in a groove shape shallower than the depth between the two manifold portions 2, and a pair of the plates 4 are opposite to each other and each of the flat flow channels 3 are overlapped so as to face each other, and the inner fin 5 is provided in the flat flow path 3.
The periphery of the plate 4 is liquid-tightly joined to each other to form an element 6, and a plurality of the elements 6 are liquid-tightly joined at the communication holes 1 to form a stacked plate heat exchanger. A pair of small trapezoidal convex portions 7 for fin stoppers and reinforcement protrude toward the inner surface of each plate 4 at the boundaries between both ends of the flat flow path 3 and the manifold portion 2, respectively.
The projecting height of the projection 7 is such that when a pair of plates 4 constituting the element 6 are overlapped in the opposite direction, the projecting end faces are in contact with each other, and the projections 7 are integrated with each other in the element 6. The length of the inner fin 5 is such that both end edges thereof are in contact with the pair of projections 7 or slightly located on the center side in the longitudinal direction thereof, and both sides in the thickness direction are the plate. 4, and is integrally joined to the inner surface of the second member.

According to the present invention, the inner fin 5 is positioned by the pair of small trapezoidal projections 7 at the boundary between both ends of the flat flow path 3 and the manifold portion 2 to provide a highly reliable plate heat exchanger. Can be configured. At the same time, at the peripheral edge of the manifold portion 2, the boundary between the flat channel 3 and the weakest internal pressure against the internal pressure is reinforced by the convex portions 7 joined to each other on the inner surface, so that a highly reliable plate-type heat exchanger is provided. Can be provided.

According to a second aspect of the present invention, in the first aspect, a joining flange 8 is formed in an annular shape around the periphery of each of the plates 4, and the notch 9 for locking is formed on the flange 8. , And a plate-type heat exchanger provided with a claw portion 10 which is fitted in alignment with the plate portion. According to the present invention, it is possible to provide a plate heat exchanger in which the positioning of the plates 4 is easy and the assembling property is good.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view on the inner surface side of a plate 4 used in the plate heat exchanger of the present invention, and FIG. 2 is an exploded longitudinal sectional view of an element 6 constituted by one plate 4. Further, FIG.
Fig. 4 is an overall front view of the plate-type heat exchanger. This plate-type heat exchanger is used as an oil cooler, and has a large number of plates 4 of the same shape alternately stacked in opposite directions. Each plate 4 is formed in an elongated dish shape by press molding, and a pair of communication holes 1 aligned with both ends thereof.
Are formed, and the hole edges of the respective communication holes 1 bulge outward in the thickness direction to form a pair of manifold portions 2.
A groove-shaped flat flow path 3 shallower than the depth is formed between the two manifold portions 2. A small flange 8 is formed in the periphery of the plate 4 in an annular shape, and the flange 8 is formed with a notch 9 and a claw 10 alternately in the longitudinal direction. The notch 9 and the claw 10 are a pair of plates 4
Are provided at positions where they are fitted and aligned with each other when they are overlapped in opposite directions.

Further, at the center of the boundary between both ends of the flat flow path 3 and the manifold portion 2, a pair of small trapezoidal convex portions 7 for stopper and reinforcement project from the inner surface side of the plate 4. The protruding height of the protrusion 7 is the same as that of the flange 8 at its end face. Further, one of the pair of communication holes 1 of each plate 4 is burred at the hole edge and protrudes outward, and the other has an inner peripheral hole that matches the outer periphery of the burring. Further, the thickness of the inner fin 5 provided in the flat flow path 3 is twice the depth of the flat flow path 3 of each plate 4, and the length thereof is, as shown in FIG. It is formed slightly smaller than between the edges. As the inner fin 5, a multi-entry type in which a metal plate is bent into a waveform and a large number of cut-and-raised portions are formed in each wave is usually used. The waves are trapezoidal or rectangular.

Thus, as shown in FIG.
And the flat flow path 3
The inner fin 5 is arranged inside. The inner fin 5 is positioned between a pair of protrusions 7 projecting from both ends of the flat flow path 3 and does not move in the longitudinal direction. It is to be noted that at least one of the outer surfaces of the parts that come into contact with each other is coated with a brazing material in advance. As shown in FIG. 4, an outer fin 14 is interposed between the elements 6, and an end plate 11
And a pair of pipe connection bosses 13 and brackets 12 are arranged at the lowermost stage, and inserted into a high-temperature furnace in a state where the whole is assembled, and the brazing material coated on each part is melted,
Then, by cooling and solidifying it, the components are integrally and liquid-tightly brazed and fixed to complete the plate heat exchanger of the present invention. At this time, the upper and lower surfaces of the inner fin 5 are joined to the inner surface of the plate 4, and the flanges 8 and the projections 7 on the peripheral edge of each plate 4 are joined to each other on the inner surface side. In the plate-type heat exchanger thus configured, high-temperature oil flows from one pipe connection boss 13 and flows through the flat flow path 3 of each element 6 to form the other pipe connection boss 13. From it it spills.
Then, cooling air is blown to the outer surface side of each element 6, and heat exchange is performed between the air and the oil.

[0010]

Operation and effect of the present invention The plate type heat exchanger of the present invention
A pair of small trapezoidal protrusions 7 is provided at the boundary between both ends of the flat flow path 3 and the manifold 2, and the respective protrusions 7 of the pair of plates 4 constituting the element 6 are in contact with each other, and the contact portion is Since it has a structure of being integrally joined, the inner fin 5 can be positioned between the pair of convex portions 7, and the inner fin 5 can be prevented from moving longitudinally in the plate during brazing or otherwise. . And a highly reliable plate type heat exchanger can be constituted. At the same time, since the convex portions 7 are joined to each other on the pair of plates, the pressure resistance of the peripheral portion of the manifold can be improved. That is, the boundary portion between the flat portion 3 and the peripheral portion of the manifold portion 2 has the weakest pressure resistance, but the convex portion 7 reinforces the portion, and a highly reliable plate heat exchanger can be provided. According to the second aspect of the present invention, the notches 9 and the claw portions 10 of the pair of plates 4 constituting each element 6 are configured to fit in alignment with each other, so that positioning of the plates 4 is easy. Thus, a plate-type heat exchanger having good assemblability can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of an inner surface of a plate 4 used in a plate heat exchanger of the present invention.

FIG. 2 is an exploded longitudinal sectional view of an element 6 constituted by one plate 4 used in the plate heat exchanger of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is an overall front view of the plate-type heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Communication hole 2 Manifold part 3 Flat flow path 4 Plate 5 Inner fin 6 Element 7 Convex part 8 Flange 9 Notch part 10 Claw part 11 End plate 12 Bracket 13 Pipe connection boss part 14 Outer fin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Murakami 3-25-3 Yoyogi Shibuya-ku, Tokyo Toyo Radiator Co., Ltd. (72) Inventor Hisae Nishikawa 3-25-3 Yoyogi Shibuya-ku, Tokyo Toyo radiator (72) Inventor Kiyoshi Sasaki 3-5-3 Yoyogi, Shibuya-ku, Tokyo Toyo Radiator Co., Ltd.

Claims (2)

[Claims] 1. A pair of communication holes 1 aligned with each other at both ends are formed, and a hole edge portion of the communication hole 1 bulges outward in a thickness direction to form a pair of manifold portions 2. A plurality of elongated plates 4 having flat flow channels 3 formed in a groove shape shallower than the depth between the two manifold portions 2, wherein the pair of plates 4 are opposite to each other and each of the flat flows Road 3 is overlapped so as to face each other,
Inner fins 5 are provided inside the flat flow path 3, and the periphery of the plate 4 is joined to each other in a liquid-tight manner to constitute an element 6. In the plate-type heat exchanger formed by joining and laminating, a small trapezoidal convex portion 7 for fin stopper and reinforcement is provided on each plate 4 at the boundary between both ends of the flat flow passage 3 and the manifold portion 2. When the pair of plates 4 constituting the element 6 are overlapped in the opposite direction, the protruding end faces thereof come into contact with each other. The inner fins 5 are integrally joined to each other within the element 6, and the length of the inner fins 5 is such that both end edges thereof are in contact with the pair of projections 7 or are located slightly closer to the center in the longitudinal direction, A plate-type heat exchanger, wherein both surfaces in the thickness direction are integrally joined to an inner surface of the plate 4. 2. The joining flange 8 according to claim 1, wherein a joining flange 8 is formed in an annular shape around the periphery of each of the plates 4, and the engaging notch 9 is fitted to the flange 8 in alignment therewith. A plate heat exchanger provided with the unit 10.