JPH0724871A - Tank for heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the generation of an air bubble mixed part at a seal resin colliding position by a method wherein an annular recessed groove is formed to the annular skirt part provided along the opening part of a resin tank for a heat exchanger and an air bubble venting protruding part is formed to the bottom part of a position where a seal resin collides from both sides when a seal member is injected into the recessed groove to be molded. CONSTITUTION:A resin tank 31 has an annular skirt part 33 along the opening part thereof and an annnular recessed groove 37 having a rectangular cross section is formed to the skirt part 33. The skirt part 33 is received in a mold and a seal resin 39a is injected into the annular recessed groove 37 and the seal molding space of an upper mold to form a protruding part 40 to the bottom part of the recessed groove 37 at the position where the injected resin 39a collides from both sides. By this constitution, before the injected seal resin 39a is perfectly unified, the air on the bottom surface side of the recessed groove 37 collides with the protruding part to be discharged to the seal molding space and, therefore, the generation of an air bubble mixed part at the seal molding resin colliding position can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger such as a radiator, and more particularly to a heat exchanger tank having a seal member fixed to a hakama portion of the tank.

[0002]

2. Description of the Related Art Recently, in order to facilitate assembly of a heat exchanger and management of a sealing member, for example, as shown in FIG. 10, a dovetail-shaped groove formed in a hakama portion 13 of a tank 11 is used. Resin is injection-molded into the annular groove 15 to seal the seal member 17.
And a heat exchanger tank in which the sealing member 17 is fixed to the annular groove 15 has been developed.

Conventionally, such a heat exchanger tank is manufactured by the method for manufacturing a heat exchanger tank disclosed in, for example, Japanese Patent Laid-Open No. 3-138116. That is, in the method for manufacturing the heat exchanger tank disclosed in this publication, as shown in FIG. 11, the hakama portion 13 of the tank 11 is housed in the molds 19 and 21, and these molds 19 and 21 are used. Holding the outer side surface 13a and the inner side surface 13b of the hakama portion 13,
The outer surface 13 of the hakama 13 is formed by the protrusion 21a formed on the surface of the mold 21 that faces the outer surface 13a of the hakama 13.
While pressing a and the inner surface 13b in opposite directions,
The sealing resin 23 is provided in the annular groove 15 and the seal forming space 19a of the die 19 located in front of the annular groove 15.
Is injected, and the sealing resin 23 is solidified in this state, whereby the heat exchanger tank as shown in FIG. 10 is manufactured.

[0004]

However, in the conventional heat exchanger tank manufactured in this manner, the seal member 17 formed by injection-molding the resin is formed at the anti-gate position opposite to the injection gate position. There is a problem that a bubble mixed portion in which bubbles are mixed is generated.

The present inventor has found the following as a result of earnest research to solve such a conventional problem. That is, as shown in FIG. 12, the sealing resin 23 injected from the injection gate 25 has the annular molding groove 15 formed in the tank 11 and the seal molding space 1 formed in the mold 19.
9a, after being branched by the injection gate 25, as shown by the arrow, it flows from both sides toward the anti-gate position 27.

However, since the temperature of the mold 19 is higher than the temperature of the tank 11, the sealing resin 2 is used.
3, the fluidity on the seal molding space 19a side is the annular groove 15.
13 is better than the fluidity on the side, and as a result, as shown in FIG. 13A, in the vicinity of the anti-gate position 27, the sealing resin 23 on the seal molding space 19a side is
It is located closer to the anti-gate position 27 than the sealing resin 23 on the annular groove 15 side, and immediately before the sealing resin 23 collides at the anti-gate position 27, as shown in FIG. An air pocket 28 is formed on the bottom surface of
Thereafter, when the sealing resin 23 is united at the anti-gate position 27, a bubble mixed portion in which the bubbles 29 are mixed is formed in the sealing resin 23 as shown in (c), and a space where the sealing resin 23 does not exist. It was found that 30 would be formed.

The present invention has been made on the basis of such knowledge, and provides a tank for a heat exchanger capable of reliably preventing generation of a bubble mixed portion at a sealing resin collision position of a sealing member. With the goal.

[0008]

According to another aspect of the present invention, there is provided a heat exchanger tank in which an annular groove having a rectangular cross section is formed in an opening end surface of an annular hakker portion formed along an opening of a resin tank. ,
In a heat exchanger tank in which a sealing member is formed in the annular groove by injection molding, a protrusion for bubble removal is formed at the bottom of the annular groove where the sealing resin injected from the injection gate collides from both sides. It is formed by forming a part.

According to another aspect of the heat exchanger tank of the present invention, an annular groove having a rectangular cross section is formed on an opening end surface of an annular hak portion formed along the opening of the resin tank. ,
In a heat exchanger tank in which a seal member is formed by injection molding, the side surface of the annular groove communicates with the outside of the hakama at a position where the sealing resin injected from the injection gate in the annular groove collides from both sides. It is formed by forming a notched groove or hole for removing air bubbles.

[0010]

In the heat exchanger tank according to the first aspect of the present invention, since the sealing resin injected from the injection gate in the annular groove is collided from both sides with a protruding portion for removing bubbles, the sealing resin is formed. Before they completely merge at the collision position, the air on the bottom surface side of the annular groove collides with the protrusion and is discharged to the seal forming space side that covers the annular groove.

In the heat exchanger tank according to the second aspect of the present invention, at the collision position where the sealing resin injected from the injection gate in the annular concave groove collides from both sides, the air bubble vent that communicates from the side surface of the annular concave groove to the outside of the hakama portion. Since the notch groove or hole for forming is formed, the air on the bottom surface side of the annular groove is discharged to the outside from the notch groove or hole before the sealing resin is completely combined at the collision position.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment of a heat exchanger tank according to the present invention. In the drawings, reference numeral 31 denotes a resin tank.

An annular skirt portion 33 is formed along the opening of the tank 31, and an opening end surface 35 of the skirt portion 33 is formed.
An annular recessed groove 37 having a dovetail shape is formed in the groove. Then, one side of an annular seal member 39 made of sealing resin is housed and fixed in the annular groove 37.

As the sealing resin, for example, a silicone type thermosetting resin, a nylon type thermoplastic resin or the like is used. Examples of the nylon type thermoplastic resin include:
Polyamide elastomer, polyamide 11 or 12, etc. are used.

In this embodiment, however, the thermosetting resin of silicon type is used as the sealing resin, and as shown in FIG. 3, at the bottom portion of the annular groove 37 facing the injection gate position, A protrusion 40 for removing bubbles is formed.

In this embodiment, the protrusion 40 is sized as shown in FIG. 3, and both sides of the protrusion 40 are inclined surfaces 40a. Such a heat exchanger tank is manufactured as described below.

That is, first, as shown in FIG. 4, the opening end face 3 of the annular skirt portion 33 is formed by a resin tank molding die.
5, a tank 31 in which an annular groove 41 having a rectangular cross section is formed
Is molded.

After this, as shown in FIG. 5, the hakama 33 of the tank 31 is housed in the seal forming mold. This seal forming die is composed of a slide die 46 that covers the outer side surface 43 of the hakama 33, a lower die 45 that covers the lower part, and an upper die 49 that covers the open end surface 35 side and the inner side surface 47 of the hakama 33. Has been done.

The lower die 45 is fixed, and the slide die 4
6 is movable in the horizontal direction, and the upper mold 49 is movable in the vertical direction. The slide type 46 has
A protrusion 51 having a triangular cross section is formed at a position near the opening end surface 35 of the outer side surface 43 of the hakama 33, and a seal molding space 53 is formed in the upper mold 49.

The hakama 33 is placed in the seal forming mold.
6, the slide mold 46 and the upper mold 49 are moved to the hakama 33 side, and the slide mold 46 and the upper mold 49 allow the outer surface 43 and the inner surface 53 of the hakama 33 to move.
And are pressed in opposite directions.

After the pressing, the protrusion 51 bites into the hakama 33, and the annular groove 37 is deformed into a dovetail shape. And
In this state, as shown in FIG. 7, an annular groove 37 deformed into a dovetail shape from the injection gate 55 formed between the upper die 49 and the slide die 46 and an upper groove located in front of the annular groove 37. The sealing resin 3 is placed in the seal forming space 53 of the mold 49.
9a is ejected.

The sealing resin 39a injected from the injection gate 55 causes the annular recessed groove 37 formed in the tank 31 and the seal molding space 53 formed in the upper mold 49 to enter into the injection gate as shown by the arrow. After branching at 55, flow from both sides toward the anti-gate position 57,
Coalesce in.

After the injection of the sealing resin 39a, the mold is held for a predetermined time to cure and cool the sealing resin 39a, and thereafter, the upper mold 49 and the slide mold 46 are moved in the direction opposite to the hakama 33. As a result, as shown in FIG. 1, it is possible to obtain the heat exchanger tank in which one side of the seal member 39 is housed and fixed in the dovetail-shaped annular groove 37.

In the heat exchanger tank described above, however, since the protruding portion 40 for removing bubbles is formed at the bottom of the anti-gate position 57 in the annular groove 37 facing the injection gate 55, the sealing resin 39a is formed. Is the anti-gate position 57
Before being completely combined with each other, the air on the bottom surface side of the annular groove 37 collides with the protrusion 40 and is discharged to the seal molding space 53 side that covers the annular groove 37.
It is possible to reliably prevent generation of a bubble mixed portion at the anti-gate position 57.

That is, in the heat exchanger tank described above, since the temperature of the upper mold 49 is higher than the temperature of the tank 31, the fluidity of the sealing resin 39a on the seal molding space 53 side is on the annular groove 37 side. Of the anti-gate position 57, as shown in FIG. 8 (a).
, The sealing resin 39a on the seal molding space 53 side is closer to the anti-gate position 57 than the sealing resin 39a on the annular groove 37 side, and the annular groove 37
Although an air pocket 59 is formed on the bottom surface of the, when the sealing resin 39a further approaches the anti-gate position 57,
As shown in (b), the sealing resin 39a has a protrusion 40
At this time, the air on the bottom surface side of the annular groove 37 is discharged to the seal molding space 53 side that covers the annular groove 37, and is discharged to the outside through the degassing portion provided in the mold. After that, the sealing resin 39a is united at the anti-gate position 57.

Therefore, the anti-gate position 5 of the seal member 39
7, it is possible to reliably prevent the occurrence of a bubble mixed portion. FIG. 9 shows a second embodiment of the present invention. In this embodiment, the annular groove 37 is provided at the counter gate position 57 of the annular groove 37 opposite to the injection gate 55 position.
A cutout groove 61 for removing bubbles is formed so as to communicate with the outside of the hakama 33 from the side surface of the.

In the heat exchanger tank of this embodiment, when the sealing resin 39a approaches the anti-gate position 57, the air on the bottom surface side of the annular groove 37 is discharged to the outside through the notch groove 61, and thereafter. Since the sealing resin 39a is united at the counter gate position 57, it is possible to obtain substantially the same effect as that of the first embodiment.

In the second embodiment described above, the notch groove 6 that communicates from the side surface of the annular groove 37 to the outside of the hakama 33.
Although the example in which No. 1 is formed has been described, the present invention is not limited to such an example, and it goes without saying that a hole may be formed instead of the notch groove.

Further, in the above-mentioned first and second embodiments, the example in which the protruding portion 40 or the notch groove 61 for removing bubbles is formed at the position facing the injection gate 55, the present invention is The present invention is not limited to this embodiment, and the sealing resin 39a injected from the injection gate 55 is used.
Needless to say, it may be a position where the collision occurs from both sides.

[0030]

As described above, in the method for manufacturing the heat exchanger tank according to the first aspect of the invention, in the annular groove, the sealing resin injected from the injection gate collides from both sides for removing bubbles from the bottom of the collision position. Since the protrusions are formed, the air on the bottom surface side of the annular groove collides with the protrusions and is discharged to the seal molding space side that covers the annular groove before the sealing resin completely merges at the collision position. Therefore, it is possible to reliably prevent generation of a bubble mixed portion at the sealing resin collision position of the sealing member.

In the heat exchanger tank according to claim 2,
At the collision position where the sealing resin injected from the injection gate in the annular groove collides from both sides, a notch groove or hole for bubble removal that communicates from the side surface of the annular groove to the outside of the hakama is formed. Since the air on the bottom side of the annular groove is discharged to the outside from the notch groove or the hole before the resin for use is completely combined at the collision position, a bubble mixed portion is formed at the sealing resin collision position of the seal member. There is an advantage that it can be surely prevented from occurring.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a heat exchanger tank of the present invention.

2 is a top view of the heat exchanger tank of FIG. 1. FIG.

FIG. 3 is an explanatory view showing a protrusion formed at a position opposite to a gate of the heat exchanger tank of FIG.

FIG. 4 is a cross-sectional view showing a state in which a rectangular annular groove is formed at the open end of the heat exchanger tank.

FIG. 5 is a sectional view showing a state in which a hakama portion is housed in a mold.

FIG. 6 is a cross-sectional view showing a state in which a hakama portion is pressed by a mold.

FIG. 7 is an explanatory diagram showing a resin flow in the annular groove in the heat exchanger tank of FIG. 1.

8 is an explanatory view showing a flow of sealing resin at a counter gate position in the heat exchanger tank of FIG. 1. FIG.

FIG. 9 is an explanatory view showing a second embodiment of the heat exchanger tank of the present invention.

FIG. 10 is a cross-sectional view showing a conventional heat exchanger tank.

11 is a cross-sectional view showing the method of manufacturing the heat exchanger tank of FIG.

12 is an explanatory diagram showing a resin flow in the annular groove in the heat exchanger tank of FIG.

13 is an explanatory diagram showing the flow of sealing resin at the anti-gate position in the heat exchanger tank of FIG.

[Explanation of symbols]

 31 Tank 33 Hakama 35 Open End 37, 41 Annular Groove 39 Seal Member

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Claims (2)

[Claims] 1. An annular groove (37) having a rectangular cross section is formed in an opening end face (35) of an annular hak (33) formed along an opening of a resin tank (31), In a heat exchanger tank in which a sealing member (39) is formed in the annular groove (37) by injection molding, a sealing resin (39a) injected from an injection gate (55) in the annular groove (37). A heat exchanger tank, characterized in that a protrusion (40) for removing bubbles is formed at the bottom of a position (57) where the two collide with each other. 2. An annular groove (37) having a rectangular cross section is formed in an opening end surface (35) of an annular hak (33) formed along the opening of a resin tank (31), In a heat exchanger tank in which a sealing member (39) is formed in the annular groove (37) by injection molding, a sealing resin (39a) injected from an injection gate (55) in the annular groove (37). A notch groove (61) for removing air bubbles, which communicates from the side surface of the annular groove (37) to the outside of the hakama (33) at a position (57) where the two collide with each other.
Alternatively, the heat exchanger tank is characterized by being formed with holes.