JP4664114B2 - Multi-plate heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and in particular, includes a core that forms a cooling fluid flow passage in a layered manner, and a case that surrounds the core and forms a cooling fluid flow passage between the core. It relates to a plate heat exchanger.

  Conventionally, as one type of heat exchanger, a multi-plate type in which a cooling fluid such as cooling water is circulated in a layer in a core and heat exchange is performed with a fluid to be cooled such as air flowing outside the core. Heat exchangers are known.

  As shown in FIG. 11, this type of multi-plate heat exchanger 1 is formed so as to surround a core (not shown) formed by stacking hollow bodies having an elongated flat shape, and the core. The case 2 is generally configured, and a reinforcing rib 3 is formed in the case 2 to ensure pressure resistance (see, for example, Patent Document 1).

Then, heat exchange is performed between the cooling water that has flowed into the core from the cooling water inlet 4 and the air that has flowed into the case 2 from the air inlet 5, and then the cooling water and the air are respectively supplied to the cooling water outlet. 6 and the air outlet 7 are discharged to the outside.
JP 59-23592 A

  However, in the conventional multi-plate heat exchanger 1 described above, in order to ensure the pressure resistance of the case 2, a reinforcing rib 3 is processed on the case 2, or the case 2 is thickened. It was necessary to increase the rigidity by attaching a reinforcing plate to 2. Therefore, there is a problem that it is difficult to reduce the manufacturing cost and to reduce the size because the weight and the outer dimensions of the case 2 increase and the material cost and processing cost increase.

  The present invention has been made to solve the above-described problems, and is intended to provide a multi-plate heat exchanger that can increase the pressure resistance of the case while reducing the manufacturing cost and reducing the size. is there.

  The present invention relates to a core formed by stacking hollow bodies in which a cooling fluid flow passage is formed, and a case in which the cooling fluid flow passage is formed between the core and the core. Is provided such that the core and the inner surface of the case can be partially brazed and joined.

  Preferably, a convex portion is formed on the outer peripheral portion of the hollow body, and the core and the inner surface of the case can be partially brazed and joined via the convex portion. It is good.

  Further, the convex portion may be formed so that the hollow body can make point contact with the inner surface of the case, and the convex portion is formed so that the hollow body can make line contact with the inner surface of the case. May be.

  The case may be formed with a recess, and the core and the inner surface of the case may be partially brazed and joined via the recess.

  The recess may be formed so that the hollow body can make point contact with the inner surface of the case, and the recess is formed so that the hollow body can make line contact with the inner surface of the case. May be.

  Further, the outer peripheral portion of the hollow body and the case are formed with engaging portions that can be engaged with each other, and the core and the inner surface of the case are partially brazed and joined via the engaging portions. It may be configured as possible.

  According to the present invention, since the core and the inner surface of the case are configured to be partially brazed and joined, the pressure resistance of the case can be improved without processing a rib or the like on the case. In addition, the case can be made thinner and the heat exchanger can be made lighter and more compact, and costs such as material costs and processing costs can be reduced.

  In addition, since the contact area between the core and the case is small and the contact resistance between the core and the case can be suppressed, the core and the case are kept in contact with each other at the time of assembling or brazing the core and the case The core and the case can be easily and smoothly slid with a limited force to perform the positioning operation. Accordingly, it is possible to prevent deformation of the case in the manufacturing process of the heat exchanger, improve workability and productivity, and further improve the reliability and performance of the product. The excellent effect can be obtained.

  Hereinafter, a multi-plate heat exchanger according to an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a perspective view showing the multi-plate heat exchanger according to the present embodiment, FIG. 2 is an exploded perspective view showing the multi-plate heat exchanger, and FIG. 3 is a cross-sectional view showing the multi-plate heat exchanger. 4 is an AA arrow view of FIG.

  The multi-plate heat exchanger 11 is schematically configured from a core 13 formed by laminating flat hollow bodies 12 and a case 14 provided so as to surround the core 13. At both ends of each hollow body 12, round hole-like communication portions 15, 16 are formed at diagonal positions, and the hollow bodies 12 communicate with each other via the communication portions 15, 16. It is like that. Further, by stacking the communication portions 15 and 16, header portions 17 and 18 are formed at both ends of the core 13, respectively, and an inlet 19 for cooling fluid projects forward in one header portion 17. The cooling fluid outlet 20 is connected to the other header portion 18 so as to protrude forward. In addition, outer fins 21 are interposed between the hollow bodies 12, and the outer fins 21 fill a gap between the core 13 and the case 14 as shown in FIG. Thus, it may be formed to protrude outward from each hollow body 12.

  As shown well in FIG. 4, each hollow body 12 is formed by superposing two pairs of plates 22 and 22 ′ in the front and rear so that a cooling fluid flow passage 32 is formed therein, Convex portions 23 and 23 ′ are formed in a dimple shape on the outer peripheral portion of each hollow body 12 at two locations on the top and bottom. The convex portions 23 and 23 ′ are formed by bending the end portions of the plates 22 and 22 ′ inwardly in a U shape, and the inner surfaces of the core 13 and the case 14 via the convex portions 23 and 23 ′. Are partly point-contactable.

  The case 14 has a rectangular parallelepiped box shape, the first peripheral wall portion 25 and the second peripheral wall portion 26 combined vertically so as to form a rectangular tube-shaped peripheral wall portion 24, and the front and rear openings of the peripheral wall portion 24. The front lid portion 27 and the rear lid portion 28 are provided so as to be able to close the cooling fluid. The inlet 19 and the outlet 20 for the cooling fluid are provided through the front lid portion 27. An inlet 29 and an outlet 30 for the fluid to be cooled are respectively provided at both ends of the case 14, and the fluid to be cooled flows between the case 14 and the core 13 and between the hollow bodies 12. A path 31 is formed. As a result, the cooling fluid and the fluid to be cooled generally circulate in directions facing each other, so that the heat exchange efficiency can be improved.

  As described above, according to the multi-plate heat exchanger according to the above-described embodiment, the core 13 and the inner surface of the case 14 are partially in point contact via the convex portions 23 and 23 ′ of the hollow body 12. Therefore, the case 14 and the core 13 can be integrally brazed and joined by using at least one of the outer surface side of the convex portions 23 and 23 ′ and the inner surface side of the case 14 as a brazing material surface. It is possible to improve the pressure strength of the. Therefore, the case 14 and the plates 22 and 22 'can be thinned without attaching a reinforcing member such as a reinforcing plate or processing a reinforcing rib, and the heat exchanger can be made lighter and more compact. Costs such as costs can be reduced.

  Moreover, since the core 13 and the case 14 are partially in contact and the contact area is small, the contact resistance between the core 13 and the case 14 can be suppressed. Therefore, when the core 13 and the case 14 are assembled, compressed (pressurized), or brazed, the core 13 and the case 14 can be easily held with a minimum force while keeping the core 13 and the case 14 in contact with each other. In addition, since the positioning operation can be performed by sliding smoothly, deformation of the case 14 and the like in the manufacturing process of the heat exchanger can be prevented, and workability and productivity can be improved. Furthermore, since the assembling work and brazing work between the members can be surely performed, the occurrence of internal leakage from the gap between the case 14 and the plates 22, 22 ′ can be prevented, and the reliability of the product and The performance can be improved.

  In addition, the shape of the joint part between the core 13 and the case 14 is not limited to the shape described in the above-described embodiment. For example, as shown in FIG. A convex portion 41 having a gently raised shape is formed on the outer peripheral side of the hollow body 12 so as to be able to make point contact, or the core 13 and the inner surface of the case 14 are partially formed as shown in FIG. A trapezoidal convex portion 51 is formed on the outer peripheral side of the hollow body 12 so as to be able to make linear contact, or the case 13 side so that the core 13 and the inner surface of the case 14 can be partially point-contacted. A dimple-like recess 61 (see FIG. 7) or a gently raised recess (not shown) is formed in the case, or the core 13 and the inner surface of the case 14 can be in partial line contact. A trapezoidal convex part on the 14 side (not shown) Or to form, or, as shown in FIG. 8, etc., respectively on the outer peripheral portion and the casing 14 of the hollow body 12 or to form an engaging engagement portions 71 and 72 to each other, a variety of changes are possible. When the engaging portions 71 and 72 that can be engaged with each other are formed on the outer peripheral portion of the hollow body 12 and the case 14, respectively, the positioning operation of the core 13 and the case 14 is further facilitated. Can be further improved.

  Further, in the above-described embodiment, the convex portions 23 and 23 ′ are formed by bending the end portions of the plates 22 and 22 ′ inwardly in a U shape, but this is merely an example. For example, as shown in FIG. 9, the end portions of the plates 22 and 22 ′ are bent inwardly without gaps to form convex portions 81 and 81 ′, or as shown in FIG. 10, Various changes can be made, such as forming convex portions 91 and 91 ′ by bending the end portions of the plates 22 and 22 ′ outwardly in a U-shape.

  Furthermore, as shown in FIG. 10, a plurality of cooling fluid flow passages 92 are formed inside the hollow body 12 by bending the plates 22 and 22 'partially inward along the flow of the cooling fluid and closely contacting them. In this case, since the cooling fluid flows without stagnating throughout the entire interior of the hollow body 12, the heat exchange performance can be further enhanced.

1 is a perspective view showing a multi-plate heat exchanger according to an embodiment of the present invention. It is a disassembled perspective view which shows the multi-plate type heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows the multi-plate type heat exchanger which concerns on embodiment of this invention. It is an AA arrow line view of FIG. It is sectional drawing which shows another example of the junction part of the core and case in the multi-plate heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows another example of the junction part of the core and case in the multi-plate heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows another example of the junction part of the core and case in the multi-plate heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows another example of the junction part of the core and case in the multi-plate heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows another example of the convex part in the multi-plate heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows another example of the convex part in the multi-plate heat exchanger which concerns on embodiment of this invention. It is a perspective view which shows the conventional multi-plate type heat exchanger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Multi-plate type heat exchanger 12 Hollow body 13 Core 14 Case 23 Convex part 31 Flow path of fluid to be cooled 32 Flow path of cooling fluid 41 Convex part 51 Convex part 61 Concave part 71 Engaging part 72 Engaging part 81 Convex part 91 Convex part Part 92 Flow path

Claims (1)

A core configured by stacking hollow bodies in which a cooling fluid flow path is formed, and a case surrounding the core and forming a cooling fluid flow path between the core and the core. In a multi-plate heat exchanger,
A convex portion is formed on the inner surface of the case so that the inner surface of the case can partially make point contact with the outer surface of the hollow body, and the outer surface of the hollow body can partially make point contact with the inner surface of the case. A convex portion is formed on the outer surface of the hollow body, and the convex portion of the case and the convex portion of the hollow body are provided to be engageable with each other, and the convex portion of the case and the convex portion of the hollow body are The multi-plate heat exchanger is characterized in that the core and the inner surface of the case can be partially brazed.

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