JP3505631B2 - Synthetic resin tank structure of heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a synthetic resin tank.
The present invention relates to caulking between a tube plate and a tank body in a waste portion (flat portion) formed between a base portion of a pipe and an opening of a tank. 2. Description of the Related Art As shown in FIG. 4, a synthetic resin tank body 2 of a conventional heat exchanger is formed in an elongated box shape with one end opening, and a small flange portion 1 slightly protrudes from the outer periphery of the opening edge. Have been. Further, a pipe 6 for a heat exchange medium entrance and exit is integrally provided on the side surface of the tank body 2. On the outer periphery of the distal end portion of the pipe 6, a hose retaining protrusion 13 is formed in an annular shape. To injection-mold the synthetic resin tank body 2 having such a pipe 6 in a mold, the pipe 6
It is necessary to use a mold in which the parting line 10 is formed on the side surface on the diameter line of. For example, the male mold side of the tank body 2 is located on the inner surface of the tank body 2, the end face and the side face of the small flange section 1, and the lower face in the drawing of the pipe 6, and between the lower side and the small flange section 1 side face. A flat surface 7 is formed. Then, the female mold forms the other outer surface of the tank body 2 and the upper surface side of the pipe 6. In addition, pipe 6
Inside, a round bar-shaped mold that enters and exits sideways is arranged. In this state, a resin material is injected into the mold, and after curing, the side round bar-shaped mold is pulled out and the upper and lower molds are opened to obtain the tank body 2 as shown in FIG. A tube plate 4 (see FIG. 3) is fitted to the small flange portion 1 of the tank body 2 via an O-ring 5, and a claw portion 9a on the outer periphery of the tube plate 4 is bent at a right angle. The tube plate 4 is fixed in a liquid-tight manner. [0003] However, in the conventional synthetic resin tank main body, as shown in FIG. 4, a lower root portion of a pipe 6 in the figure has a flat surface 7 protruding for convenience of molding. Correspond to the surface of the small flange portion 1. Therefore, the claw 9b of the tube plate 4 cannot be bent and crimped on the flat surface 7 as shown in FIG. Then, there is a possibility that the pressure resistance is reduced in the portion where the bending cannot be performed. Therefore, an object of the present invention is to provide a synthetic resin tank structure of a heat exchanger that can squeeze the claws well even on the flat surface 7 at the base of the pipe 6. For this purpose, the following configuration is adopted. SUMMARY OF THE INVENTION [0004] The present invention is manufactured by injection molding, and has a small flange portion on the outer surface of the rim at one end opening.
An elongated synthetic resin tank body (2) with (1) protruding,
A tube plate (4) having an annular recess (3) aligned with the opening formed on the outer periphery thereof; and
Heat said opening through said O-ring (5) while being fitted in the annular recess (3), the annular recess (3) is fastened and fixed to the small flange of the opening by caulking (1) of Exchange
A tank body made of synthetic resin,
A pipe (6) is integrally protruded from the side surface of (2), and the outer surface of the pipe (6) on the diameter line thereof and a surface parallel to the surface of the opening are joined to a parting line (10) of an injection molding die. ), The surface between the pipe (6) and the outer surface of the opening coincides with the outer surface of the small flange portion (1), and the thickness thereof is larger than the thickness of most of the tank body (2). It is formed thick and has a flat surface (7) whose width is equal to the outer diameter of the pipe (6), and a groove-shaped crimping tool is formed at the boundary between the small flange (1) and the flat surface (7). A concave portion (8) is formed, and the small flange portion is formed.
The heat exchanger made of synthetic resin is a heat exchanger in which only the space between (1) and both ends in the width direction of the flat surface (7) is integrally connected by the legs (9) .
It has a tank structure . Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an essential part of an upper tank body 2 of the present invention, FIG. 2 is a front view of an essential part showing an assembled state thereof, and FIG. 3 is a sectional view taken along line III-III in FIG. This tank main body 2 is different from that of the conventional type shown in FIG. 4 in that a caulking recess 8 is formed at the boundary between the flat surface 7 at the base of the lower surface of the pipe 6 and the small flange 1 in the drawing. . In this example, both ends of the flat surface 7 in the width direction and the small flange 1 are connected by a pair of legs 9, and a caulking recess 8 is provided between the pair of legs 9. The depth of the caulking recess 8 is formed such that the wall thickness excluding it is equal to the thickness of most of the tank body 2. In order to form such a tank body 2, in addition to the conventional male and female molds and a round bar-shaped mold for the inner surface of the pipe 6, a mold for the caulking recess 8 is provided so as to be freely inserted and removed. Just do it. As the mold for providing the crimping recess 8 relatively small and partly as described above, a mold used for an undercut processing means in a conventionally known injection molding mold may be applied. The tank body 2 thus formed
Are usually arranged in a pair in the heat exchanger.
(The lower tank is omitted in FIG. 2). The tank is constituted by the tank body 2 and the tube plate 4. The tube plate 4 has an annular recess 3 which is aligned with the small flange portion 1 on the outer periphery as shown in FIG. A large number of tubes 11 are formed in parallel and penetrate the tube plate 4 respectively, and the penetrating portions are fixed in a liquid-tight manner.
The fins 12 are arranged as shown in FIG. The small flange portion 1 of the tank main body 2 is fitted to the annular concave portion 3 of the tube plate 4 via the O-ring 5, and the tank main body 2 is pressed against the annular concave portion 3 while standing on the outer wall of the annular concave portion 3. A liquid-tight tank can be formed by bending the raised claws 9a, 9b at right angles to the small flange 1 side. At this time, the claw portion 9b is also bent at the crimping concave portion 8. Therefore, the width of the caulking recess 8 is set so that the tip of the caulking jig can be inserted therein. The tank structure made of synthetic resin of the heat exchanger according to the present invention has a parting line 10 for an injection molding die on the diameter line of the outer surface of the pipe 6. A grooved caulking recess 8 is formed at the boundary between the small flange portion 1 and the flat surface 7 in the case where the flat surface 7 which is the same plane as the small flange portion 1 exists on the opening side, and the width of the flat surface 7 is formed. Direction
One leg 9 is flush with only the end and the caulking recess 8.
Because it is connected to the body, the presence of its legs 9
6 to improve the strength. That is, the thick flat surface 7 and the small
In the same way, by integrating the flange 1 with the thick leg 9,
External force applied to the pipe 6 is applied to the small
It can also be supported by the flange portion 1. Therefore, the base of the pipe 6
High strength and a highly reliable synthetic resin tank structure.
You can. Also, due to the presence of the caulking recess 8, the pipe 6
A highly reliable tank structure that can be caulked beside
You.

[Brief description of the drawings] FIG. 1 is a perspective view of a main part of an upper tank body 2 of the present invention. FIG. 2 is a front view of a main part showing the assembled state. FIG. 3 is a sectional view taken along the line III-III in FIG. 2; FIG. 4 is a perspective view of a main part of a conventional tank body 2. FIG. 5 is a front view of a main part showing the assembled state. [Explanation of symbols] 1 Small flange 2 Tank body 3 annular recess 4 Tube plate 5 O-ring 6 pipes 7 Flat surface 8 Recess for caulking 9 legs 9a, 9b claw 10 Parting line 11 tubes 12 Fins 13 Hose retaining projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 9/02

Claims (1)

(1) An elongated synthetic resin tank body (2) manufactured by injection molding and having a small flange (1) protruding from an outer peripheral surface of an opening at one end thereof. A tube plate (4) having an annular recess (3) aligned with the opening formed on the outer periphery thereof; and the opening of the tank body (2) having an O-ring (5) on the annular recess (3). And the annular concave portion (3) is fixed to the small flange portion (1) of the opening by caulking, and the tank main body (2) A pipe (6) is integrally protruded from the side surface of the pipe, and the outer surface of the pipe (6) on the diameter line and a surface parallel to the surface of the opening is defined as a parting line (10) of an injection molding die. The surface between the pipe (6) and the outer surface of the opening matches the outer surface of the small flange portion (1), and A flat surface having a thickness greater than the bulk of the tank body (2) and a width equal to the outer diameter of the pipe (6);
A groove-shaped caulking recess (8) is formed at the boundary between the small flange (1) and the flat surface (7), and the small flange portion (1) and the flat surface ( 7) Both ends in the width direction
Synthetic resin tank structure of the heat exchanger with the legs (9) integrally connected only flush with the parts .