JPS6314229Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] In this invention, the main body of the tank and the water pipe provided on the outer wall of the tank are separately molded, and then the water pipe is formed on the connecting wall of the main body of the tank. The present invention relates to an improvement of a resin tank for a heat exchanger which is fitted into a joining hole to integrally connect the two.

[Conventional technology]

Recently, radiator tanks have been made of resin instead of the conventional ones made of brass (including aluminum), mainly from the viewpoints of ease of manufacture, weight reduction, and cost reduction. I'm getting old.

By the way, in the radiator tank (atsupa tank and lower tank), the inlet
Since water conduits such as pipes, outlet pipes, filler necks, etc. are provided, in the case of structures made of resin as described above, these conduit pipes (a) are usually formed integrally with the tank main body (b) as illustrated in Fig. 1. It was designed to take advantage of the moldability of resin. However, in the case of such an integrally molded type, especially when the water pipe a is subjected to a bending moment due to vibration or other action like a filler neck, the area near the root of the water pipe a connected to the tank main body b, c. There is a problem that cracks occur in the metal, causing functional deterioration. In addition, the structure of the mold becomes complicated, and since a core punch hole d is formed, it is necessary to weld a lid e to close the hole d, which reduces work efficiency.

For this reason, many conventional resin tanks have a tank main body b' and a water conduit pipe, as shown in Figure 2.
The structure is such that a' is molded separately and then integrally joined. To explain this joint part in detail, joint flanges f and g are formed at each joint end of tank main body b' and water conduit a', and either joint flange f or g (in the case of illustration, joint flange An O-ring groove h is formed in the end face of g), and the tank main body b' and water conduit a' are connected to the O-ring groove h.
After inserting the O-ring i into the ring groove h, both the joining flanges f and g are joined and connected by fastening them with a plurality of bolts j and nuts k.

[Problem that the invention attempts to solve]

By the way, in the case of such a joint type, it is possible to considerably reduce the problems of the above-mentioned integrally molded type, but on the other hand,
Another problem occurred, as described below, and it was not practical. That is, since the tank main body b' and the water conduit a' are connected by a plurality of bolts j, not only is the assembly work time-consuming, but also the connection flange f depends on the tightening force of the bolts j. , g may be bent and the watertightness may be impaired, or the joint flanges f and g may be poorly connected and the watertightness may be impaired, making it extremely difficult to tighten the bolt j.
Even if the O-rings i are connected in a watertight state by adjusting the temporary bolts j, the bolts i will loosen when subjected to vibration, resulting in a poor connection and loss of watertightness.

[Purpose of invention]

This idea was devised in view of the above circumstances, and aims to improve the efficiency of the work of connecting the main body of the tank and the water pipe, and to provide a resin tank for a heat exchanger that ensures good watertightness at the joint. With the goal.

[Means for solving problems]

In order to achieve this purpose, this invention provides a resin tank for a heat exchanger that is integrally connected to the tank main body by fitting a water conduit into a connection hole formed in the wall portion of the tank main body. A plurality of retaining claws are formed on the outer peripheral surface of the inner end of the water conduit pipe, and a flange is formed behind the retaining claws, and a plurality of retaining claws are formed on the inner peripheral surface of the connecting hole provided in the main body of the tank along the hole direction. A pawl guide groove for guiding the retaining pawl of the water conduit pipe, and a plurality of arc-shaped grooves at the inner end of which the groove width is gradually narrowed in the rotational direction of the conduit pipe and the valley diameter is reduced, and a pawl retaining recess is provided at the end. A connecting groove is provided, and a packing material that is pressed into contact with the flange of the water pipe is attached to the connecting portion of the water pipe and the coupling hole.

[Effect of invention]

According to this invention, the water conduit pipe is inserted into the coupling hole of the tank main body while the retaining claw of the water conduit is engaged with the guide groove of the tank main body, and the retaining claw is connected to the catch recess through the arcuate communication groove. By rotating into engagement, the water conduit is coupled to the tank body. The water pipe is installed with a high clamping force by the retaining claw and the flange, and the pressure contact force of the flange is increased by the elasticity of the retaining claw that engages with the retaining recess and is compressed in the thickness direction. Therefore, sufficient watertightness of the joint by the packing material is ensured.

[Example of idea]

Examples of the case where this invention is applied to a radiator tank are shown in Figures 3 and 4 below.
This will be explained based on the diagram.

The upper tank UT of this embodiment is equipped with an inlet pipe and a fillet neck in the same manner as is known in the art, but since they all have the same connection structure, the inlet pipe will be explained here.

In the figure, 1 is a tank main body, and 2 is a bent inlet pipe that is fitted into a coupling hole 4 formed in a coupling wall 3 of the tank main body 1.

The coupling hole 4 of the tank main body 1 is formed in an inwardly facing boss 5 portion, and the outer end 6 of the hole is provided with a flange engagement step 7 and an O-ring in the inward direction, as shown in FIG. A mounting stage 8 is formed, and the inner circumferential surface 9 has a plurality of (in this case, two facing each other) rectangular pawl guide grooves 10, 10' along the hole direction, as shown in FIG.
As shown in FIGS. 7 and 8, the claw guide grooves 10, 10' are connected to the respective claw guide grooves 10, 10' and are provided at the inner end 11 of the boss 5.
Arcuate communication grooves 12, 12' are formed in which the groove width l narrows and the valley diameter φ decreases as the distance from the connecting part with the boss 5 increases.
2, 12' and an arcuate communication groove 1
A rectangular pawl recess 13 which is slightly deeper than the connecting part root diameter φ ₁ of the connecting grooves 12 and 12' and approximately the same depth as the root diameter φ ₂ of the starting end of the arcuate communication grooves 12 and 12';
13' is formed. The pawl recesses 13, 13' are here offset by 90 DEG to the pawl guide grooves 10, 10'.

On the other hand, as shown in FIG. 9, the curved inlet pipe 2 has rectangular retaining claws 14, 14' formed on the upper and lower sides of the outer peripheral surface of its inner end, and the retaining claws 14,
A flange 15 is formed on the outer peripheral surface rearward of 14'. The retaining claws 14, 14' are provided here at positions perpendicular to the bending direction of the bent portion 16, and the width _l1 thereof is equal to the retaining recess 13,
13' width l ₂ or slightly smaller (l ₁ ≦l ₂ ), and the outer diameter φ ₃ is set to be the same as or slightly smaller than the root diameter φ ₂ of the arcuate connecting grooves 12, 12' (φ ₃ ≦2φ ₂ ) is set.

A curved inlet configured like this
The pipe 2 has an O on the outer peripheral surface of the inner end of the flange 15.
- After installing the ring 17, each retaining claw 14, 1
4' into the pawl guide grooves 10, 10', and insert it into the coupling hole 4 of the tank main body 1, so that the O-ring 17 is
- Rotate clockwise when it abuts the ring mounting stage 8 (see Figure 3). In this way, each of the retaining claws 14, 14' is connected to the respective arcuate communication grooves 12, 1.
2' while being gradually compressed in the thickness direction and height direction, and is locked in the pawl locking recesses 13, 13'.
At this time, the retaining claws 14, 14' are decompressed in the height direction and restored in the height direction, thereby preventing rotation and retaining. At the same time, the pressure contact force of the flange 15 is increased by the elasticity of the retaining claws 14, 14' which are compressed in the thickness direction, and the bent inlet pipe 2 is held by the high clamping force of the retaining claws 14, 14' and the flange 15. installed, and
The O-ring 17 ensures watertightness of the joint.

As described above, according to the present embodiment, while the retaining claws 14, 14' of the bent inlet pipe 2 are engaged with the claw guide grooves 10, 10' of the tank main body 1, the bent inlet pipe 2 is inserted into the tank main body 1. 1 into the coupling hole 4, and pass the retaining claws 14, 14' through the arcuate communication grooves 12, 12' into the retaining recesses 13, 1.
3', the bent inlet pipe 2 can be easily connected to the tank main body 1 by simply rotating it so that it engages with the inlet pipe 3'. Compared to this, the efficiency of the joining work has improved. Moreover, the bent inlet pipe 2 is installed with a high clamping force by the retaining claws 14, 14' and the flange 15, and the retaining retainer is engaged with the retaining recesses 13, 13' and compressed in the thickness direction. Since the pressure force of the flange 15 is increased by the elasticity of the claws 14, 14', the O-
Sufficient watertightness of the joint by the ring 17 was ensured.

Moreover, as mentioned above, in this embodiment, the tank main body 1
Since no bolts are used to connect the bent inlet pipe 2 to the bent inlet pipe 2, problems such as poor connection due to tightening or loosening of the bolts do not occur. In addition, an auxiliary part for joining is an O-ring 17.
Since only a packing material such as .

As shown in FIGS. 10 and 11, the O-ring 17 is formed at a position on the flange 15' or at the outer end 6' of the hole in the tank main body 1 so as not to contact the pawl guide grooves 10, 10'. If the O-ring 17 is mounted on the mounting stages 8' and 8'', the sealing function and life of the O-ring 17 can be improved.

[Effect of idea]

As described above, according to this invention, when the water conduit pipe is fitted into the coupling hole of the tank main body, the plurality of retaining claws formed on the outer peripheral surface of the inner end are inserted into the inner circumferential surface of the coupling hole in the direction of the hole. When the flange formed at the rear of the retaining pawl contacts the joint surface of the main body of the tank and rotates in one direction, the retaining pawl rotates. An arc-shaped communication groove at the inner end of the coupling hole is formed at the inner end of the coupling hole, which gradually narrows the groove width in the direction and the diameter of the valley is gradually compressed in the thickness direction and the height direction. Since it is fitted into the pawl stopper recess with the height direction compression released, bolts are not required to connect the tank main body and the water pipe, and it can be easily installed without tools. Problems such as poor joining due to tightening or loosening are eliminated. Further, since the packing material is attached to the connecting portion of the water guide pipe and the coupling hole by being pressed into contact with the flange formed on the water guide pipe, sufficient watertightness can be ensured.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional side views showing a resin tank of a heat exchanger having a conventional structure, respectively. FIG. 3 is a perspective view of an embodiment of this invention. FIG. 4 is an enlarged vertical sectional side view of the same main part. FIG. 5 is an enlarged longitudinal sectional side view showing a coupling hole formed in the main body of the tank.
FIG. 6 is a view in the direction of arrow A. FIG. 7 is a view taken in the direction of arrow B. FIG. 8 is an enlarged longitudinal sectional side view of the main part of the coupling hole. FIG. 9 is a perspective view of the inlet pipe. FIG. 10 and FIG. 11 are longitudinal sectional side views of the same modification. Explanation of the symbols of the main parts, 1...tank main body,
2...Curved inlet pipe (water pipe), 3
... Connection wall, 4 ... Connection hole, 7 ... Flange engagement step (joint surface), 9 ... Inner peripheral surface, 10, 10' ... Claw guide groove, 11 ... Inner end, 12, 12' ...Arc-shaped communication groove, 13, 13'...Claw recess, 14, 14'...
...Preventing claw, 15...Flange, 17...O-ring (packet material), l...Groove width of claw guide groove, φ...
...Valley diameter of the pawl guide groove.

Claims (1)

[Scope of utility model registration request] In a resin tank of a heat exchanger in which a water conduit is fitted into a coupling hole formed in a wall portion of the tank main body to be integrally connected to the tank main body, a plurality of retaining claws are provided on the outer circumferential surface of the inner end of the water conduit. As well as forming
A flange is formed at the rear of the retaining pawl, and a pawl guide groove for guiding the retaining pawl of the water conduit pipe along the hole direction on the inner peripheral surface of the coupling hole provided in the main body of the tank, and a pawl guide groove at the inner end thereof. The groove width is gradually narrowed in the rotational direction of the water conduit pipe, and the valley diameter is reduced in diameter, and a plurality of arcuate communication grooves each having a pawl recess at the end are provided, and the joint portion between the water conduit pipe and the coupling hole is provided with a plurality of arcuate communication grooves. A resin tank for a heat exchanger, characterized in that it is equipped with a packing material that is pressed into contact with the flanges of the water conduit pipes.