JPS6350629Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to the boss structure of a stacked heat exchanger in which hollow elements made of metal plates are stacked. This invention relates to something that can be easily done and has improved strength of the boss portion.

[Technical background of the invention and its problems] A conventional stacked heat exchanger has a structure as shown in FIG. 1, as an example. This is an oil cooling heat exchanger that is housed in one tank of an automobile radiator.

Each element constituting this heat exchanger is constructed by stacking a pair of elongated corrugated metal plates in opposite directions, as shown in FIGS. 1 to 3, with holes 1 bored at both ends. Three stages of such elements are stacked one on top of the other, and the boss 3 is positioned around the periphery of the hole 1 in the uppermost stage. At the same time, the lowermost element 2 has a hole on the lower side that is closed. The lower surface is formed as a concave curved surface as shown in FIG. 2, and has a structure capable of withstanding oil pressure. The metal plates constituting each of these elements are generally brazing sheets whose inner and outer surfaces are coated with a brazing material in advance. Then, as shown in FIG. 2, they are laminated, the spaces between them are fastened together using a suitable jig, and the elements are heated in a vacuum furnace or gas furnace to integrally braze the elements and the boss 3.

However, the boss structure of the heat exchanger as shown in FIG. 2 has the following drawbacks.

Since the boss 3 is brazed and fixed only to the upper metal plate of the uppermost element, if an external force is applied to the boss 3, the metal plate will deform, the brazed portion may peel off, or the flow path may be deformed. There was a risk that this would happen. Therefore, in order to increase the strength, it was necessary to use reinforcing materials such as reinforcements. Further, during brazing, it is necessary to firmly fasten and fix each element and boss using an appropriate jig so that the relative positions of each element and boss do not shift, which is troublesome. Furthermore, after brazing, it was necessary to remove the fastening jig. Furthermore, the jig was severely worn out due to the high temperature. Therefore, an object of the present invention is to provide a boss structure that eliminates the above problems.

[Summary of the idea]

In the boss structure of the present invention, the hollow element 2 is composed of two elongated metal plates, each metal plate has its respective peripheral edge raised up, and a hole 1 is bored in the end. The two metal plates are stacked so that the rising directions are opposite to each other. Then, a plurality of hollow elements are stacked and positioned so that the holes 1 formed in each element are aligned with each other. A boss 3 for connecting a flow path is positioned in the hole 1 of the outermost element 2, and the bosses 3 are brazed to each other. Here, the present invention particularly provides a threaded portion 4 at one end of the boss 3. A flange 8 is provided protruding from the outer periphery of the other end of the boss 3, and is brought into contact with the hole edge of the element. Furthermore, a through part 5 is formed in the middle part of the boss 3, and the through part 5 passes through each of the holes 1. . Further, one end of the communication hole 6 is opened in the end face of the boss 3, and the other end is opened in the through portion 5, so that the communication hole 6 communicates with each element. A fastening member 7 is screwed onto the threaded portion 4 so that the elements 2 can be fastened to each other.

Therefore, according to this structure, the hole 1 of each element
By passing the boss 3 through and screwing the fastening member 7, it is possible to accurately position each member. Since it is possible to fasten them together, a fastening jig for brazing is not required. Furthermore, since the boss 3 penetrates each element and restrains them integrally, the external force applied to the boss 3 is supported by all the elements, thereby providing a strong boss structure.

[Example of idea]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 4 is a longitudinal sectional view of the main part of this structure, and FIG. 5 is an elevational view of the boss 3 used in this structure.

The boss 3 used in this structure consists of a hollow body with one end closed as shown in FIGS. 4 and 5, and has a threaded portion 4 at its upper end and a flange 8 projecting from its lower end. At the same time, a penetrating portion 5 is formed in the intermediate portion, and the penetrating portion 5 has a communicating hole 6 formed of an elongated hole bored over almost the entire length thereof. In addition, the penetration part 5
In this embodiment, the length is approximately equal to the height of three stacked elements. Next, the fastening member 7 is attached to the boss 3
It is screwed onto the threaded portion 4 of the holder, and is formed into a ring or nut shape.

To complete the present boss structure, first, the three elements are passed through the boss 3. Next, each element is fastened and fixed using the fastening member 7 as shown in FIG. Although FIG. 4 shows only one boss portion in FIG. 1, the other boss portion is assembled in the same manner. At this time, the metal plates 13a and 13b constituting each element are made of the above-mentioned brazing sheet. Then, the thus assembled state is heated in a vacuum furnace or gas furnace, and the respective elements, the boss 3, and the fastening member 7 are integrally brazed to each other.

Note that the present invention is of course not limited to the above-described embodiments, and for example, the shape of each element and the shape of the communicating hole 6 of the boss 3 can be changed as appropriate.

[Effect of idea]

As is clear from the above description, the configuration of the boss structure of the present invention is such that the hollow element 2 is composed of two elongated metal plates, each metal plate has its peripheral edge raised up, and its end portion A hole 1 is bored in the hole 1. The two metal plates are stacked one on top of the other so that their rising directions are opposite to each other.
Then, a plurality of hollow elements are stacked and positioned so that the holes 1 formed in each element are aligned with each other. A boss 3 for connecting a flow path is positioned in the hole 1 of the outermost element 2, and the bosses 3 are brazed to each other. Here, the present invention particularly provides a threaded portion 4 at one end of the boss 3. A flange 8 is provided protruding from the outer periphery of the other end of the boss 3, and is brought into contact with the hole edge of the element. Furthermore, a through part 5 is formed in the middle part of the boss 3, and the through part 5 passes through each of the holes 1. Further, one end of the communication hole 6 is opened in the end face of the boss 3, and the other end is opened in the through portion 5, so that the communication hole 6 communicates with each element. A fastening member 7 is screwed onto the threaded portion 4 so that the elements 2 can be fastened to each other.

The boss structure of the present invention has the above configuration and has the following effects.

(1) Brazing work can be performed with each element 2 being fastened and fixed to some extent by the collar 8 of the boss 3 and the fastening member 7. Therefore, there is no need for a jig or the like to restrain each element during brazing, and the brazing work can be performed easily and quickly. At the same time, each element can be accurately positioned and restrained, and a laminated heat exchanger with stable quality can be provided.

(2) Also, since the boss 3 passes through each element and is integrally connected to all the elements, the connection strength between the boss portion and each element is increased.

(3) Also, since the boss 3 has a structure that penetrates each element, the bending moment force applied to the boss 3 from the direction perpendicular to its axis is shared by all elements, so only some elements are affected by external force. There is no risk of deformation or peeling of the brazed parts. In addition, it is possible to provide a boss structure with a long life.

(4) Furthermore, since the boss 3 of the present invention has a structure that penetrates all the elements, each element can have exactly the same shape. That is, in the conventional laminated heat exchanger, as shown in Fig. 2, the lowermost metal plate had to have hole 1 blocked, unlike the other metal plates, but in the present invention, all of the metal plates are made of the same metal. Each element made up of plates can be used. Thereby,
The number of molds for production is reduced, and the production can be carried out quickly. At the same time, since identical elements are stacked, the stacking order can be arbitrary, and assembly itself becomes easy.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional stacked heat exchanger;
FIG. 2 is a longitudinal sectional view showing the structure of the boss part, and FIG. 3 is each metal plate 13a, 13b constituting the element.
FIG. 4 is a longitudinal sectional view of a main part showing the boss structure of the present invention, and FIG. 5 is an elevational view of the boss 3 used in the same structure. 1...hole, 2...element, 3...boss, 4
...Threaded part, 5... Penetration part, 6... Communication hole, 7...
...Fastening member, 8... Flange, 9... Oil flow path,
10...Water flow passage, 11...Inlet, 12...Outlet, 13a, 13b...Metal plate.

Claims (1)

[Scope of utility model registration request] A hollow element 2 is constructed by stacking two elongated metal plates, each of which has a raised peripheral edge and a hole 1 formed at its end, so that the raised directions face each other. , a plurality of hollow elements 2 are stacked with the holes 1 aligned with each other, a boss 3 for connecting a flow path is located in the hole 1 of the outermost element 2, and each metal plate and each element and In the boss part structure of the laminated heat exchanger in which the spaces between the bosses 3 are brazed, a threaded part 4 is threaded on one end of the boss 3, and a threaded part 4 is provided protruding from the outer periphery of the other end of the boss 3. , a collar portion 8 that comes into contact with the hole edge of the element, and a boss 3
a through hole 5 that is formed in the middle of the hole and passes through each hole 1; a communication hole 6 that has one end open to the end surface of the boss 3 and the other end that opens to the through hole 5 and communicates with each element; A boss part structure of a laminated heat exchanger characterized by comprising a fastening member 7 which is screwed onto the part 4 and fastens each element 2 to each other.