JP3239624B2 - Liquid tank made of resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin liquid tank used in a liquid flow path of a liquid supply device or the like.

[0002]

2. Description of the Related Art A conventional resin liquid tank used in a cooling water supply device for supplying cooling water for an electronic device is shown in FIG.
As shown in FIG. 1, a resin container 1 having an opening 1a at the bottom center and a hollow ring-shaped insert fitting 2 buried around the opening 1a are provided, and a rubber packing 3 is provided on a contact surface 2a thereof. The flange-type pipe joint 4 has the flange portion 4a fixed by screws 5 and is connected to the outside. The insert fitting 2 is buried integrally with the resin container 1.

[0003]

However, in the conventional resin-made liquid tank, the insert metal fitting is formed by a straight portion having no concave groove or convex portion on the outer periphery and the inner periphery to prevent slipping. . For this reason, when the surrounding temperature change width is large due to a difference in the thermal expansion coefficient between the insert fitting and the resin container, a gap may be formed between the two members. Further, when the flange fitting is fixed with a screw and a tensile stress is applied to the insert fitting, there is a concern that the insert fitting itself may move due to insufficient burying strength.

[0004] When such a phenomenon occurs, there is a possibility that the cooling water at the joint portion penetrates into a gap formed at the boundary between the resin and the insert fitting and leaks to the outside. Therefore, when the temperature change width is large and even if the flange type pipe joint is strongly fixed, no gap is generated at the boundary between the resin and the insert fitting.
Moreover, it is an object of the present invention to provide a resin-made liquid tank which is connected to the outside by a flange type pipe joint which is easy to manufacture.

[0005]

In order to achieve the above object, a container for storing a liquid having an opening at the bottom center, and an insert fitting buried around the opening and provided with a contact surface are provided. In a resin liquid tank connected to the outside by a flange type pipe joint fixed to the contact surface, an insert fitting with a circumferential concave groove, a circumferential protrusion, and a screw hole on the contact surface is formed. Then, it is assumed that the contact surface is exposed and the resin is integrally molded with the container and buried.

[0006] In addition, a circumferential convex portion having a step lower than the contact surface on the inner periphery of the insert fitting and a concave portion on the surface are provided.
It is preferable that the convex portion is embedded with the resin of the container which is substantially flush with the contact surface of the insert fitting. Further, it is effective to embed the contact surface of the insert fitting so as to protrude at least from the outer bottom surface of the outer peripheral portion of the container.

[0007]

In the above construction, an insert fitting having a circumferential groove, a circumferential protrusion, and a screw hole in the contact surface is formed, the contact surface is exposed, and the container is made of resin. When integrally molded and buried, the thermal expansion coefficient of the resin is larger than that of the insert, so at high temperatures, the degree of adhesion increases due to the expansion of the resin in the inner peripheral portion of the insert and the groove, thereby maintaining airtightness.
Blocks liquid penetration. When the temperature is low, the degree of adhesion increases due to shrinkage of the resin at the outer peripheral portion and the convex portion of the insert fitting, thereby maintaining airtightness and blocking liquid permeation. In addition, the movement of the insert fitting in the pull-out direction is suppressed even at high and low temperatures because the resin has buried the movement path by the concave groove and the convex part.

In addition, a circumferential convex portion having a step lower than the contact surface is provided on the inner periphery of the insert fitting, and a concave portion is provided on the surface.
When the protruding portion is embedded with the resin of the container having substantially the same surface as the contact surface of the insert fitting, the resin portion forming the same surface as the insert fitting is circumferentially recessed from the contact surface due to sink during resin molding. To be distorted. Since this distortion has a spring property, the convexity of the insert fitting is embraced to maintain the degree of closeness of the projection, thereby improving the airtightness.

Further, when the abutment surface of the insert is protruded and embedded at least from the outer bottom surface of the outer periphery of the container, the outer bottom surface of the container does not protrude from the abutment surface of the insert due to variations during molding. Improves the reliability of contact between packing and flange type pipe joint.
Moreover, even if the outer bottom surface of the container has unevenness, the resin molding of the container is facilitated because it does not matter.

[0010]

An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2 showing the embodiment and FIG. 3 showing the conventional example, the same parts are denoted by the same reference numerals. In FIG. 1, a container 1 serves as a container for storing a cylindrical cooling water made of a synthetic resin having an upper lid (not shown) and a circulating water supply port at a bottom. Opening 1a and a flange portion 4 of a flange type pipe joint 4 around the opening 1a for coupling to the outside.
a for fixing a.
The insert metal fitting 2 is for tightly and mechanically fixing the container 1 and the flange type pipe joint with air tightness, and must be completely integrated with the resin of the container 1. For this reason, the insert fitting 2 is a metallic hollow ring having a substantially L-shaped cross section, and two circumferential concave grooves 2b arranged side by side on its outer circumference, a circumferential convex part 2c on the middle and inner circumferences, and a small inner ring. A peripheral groove 2d is provided on the periphery, and a plurality of screw holes 2e for fixing the flange portion 4a are provided. The insert fitting 2 thus configured is integrally formed of a synthetic resin so as to be embedded in the container 1 with the contact surface 2a exposed, thereby forming a resin liquid tank.

Therefore, each concave groove and convex portion are
Solidly buried by filling and tying synthetic resin, and even when the temperature change width is large, the directions of shrinkage and expansion work in a mutually complicated manner to prevent the generation of a gap communicating with the boundary between the synthetic resin and the insert fitting. Can be. Also,
Since the pull-out strength of the insert fitting corresponds to the shearing force of the synthetic resin, it is firm.

Next, another embodiment will be described only with respect to parts different from the above. In FIG. 2, the insert fitting 11 is
A metallic hollow ring having a substantially L-shaped cross section, and a circumferential convex portion 11b having an abutment surface 11a and a step on its inner periphery;
On its outer surface, a circumferential concave groove 11c and a flange 4
and a plurality of screw holes 11e for fixing a. Insert fitting 11 configured in this way
Is integrally molded with a synthetic resin so that the contact surface 11a is exposed, and the convex portion 11b is embedded and embedded in the container 1, thereby forming a resin liquid tank.

Therefore, the resin portion 11d in which the convex portion 11b is embedded embraces the convex portion 11b with a spring property by sinking during integral molding. Therefore, complete airtightness can be maintained, and the movement of the insert fitting can be prevented. Further, in the two embodiments, when the abutment surface 2a shown in FIG. 1 or the abutment surface 11a shown in FIG. 2 of the insert fitting is made to project at least from the outer bottom surface 1b shown in FIG. This is effective because unevenness during resin molding does not affect the fixing of the flange portion 4a of the flange type pipe joint 4.

The resin liquid tank thus configured is
A packing 3 made of rubber or the like on the lower contact surface 2a or 11a, and a flange portion 4a of a flange type pipe joint 4 thereon.
Abuts on each other and is fixed by screws 5 and connected to the outside. In addition, when the flange type pipe joint 4 and the container 1 are connected in a state having tension, the degree of surface adhesion in the concave groove and the convex part is strengthened, so that an effect of increasing reliability for preventing water leakage is produced.

The resin liquid tank constructed as described above eliminates the problem of water leakage at the boundary between the insert fitting and the resin when connected to the outside with a flange-type pipe joint, and moves the insert fitting. No more worries.

[0016]

Since the present invention is configured as described above, it has the following effects. By forming an insert fitting with a circumferential concave groove, a circumferential convex part, and a screw hole in the contact surface, exposing the contact surface, integrally molding with the container with resin and embedding it Even when the temperature change width is large, a gap is not generated at the boundary between the two members due to the difference in the thermal expansion coefficient between the resin of the container and the insert fitting, and the water leakage from the resinous liquid tank is eliminated. In addition, the filling of the resin into the concave groove and the holding of the resin in the protruding portion eliminate the movement phenomenon of the insert fitting.

[0017] Further, a circumferential convex portion having a step lower than the contact surface is provided on the inner periphery of the insert metal fitting, and a concave portion is provided on the surface.
By embedding the protruding portion with the resin of the container having substantially the same surface as the contact surface of the insert fitting, the resin has a spring property to embrace the protruding portion of the insert fitting by sinking of the resin during molding. The shape prevents the formation of gaps and eliminates water leakage from the resinous liquid tank. Further, for the same reason, the movement of the insert fitting does not occur.

Further, by burying the contact surface of the insert fitting at least protruding from the outer bottom surface of the outer peripheral portion of the container, problems of the adhesiveness of the packing can be eliminated.
The production of the resin liquid tank is facilitated by reducing the surface finish.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a resin liquid tank showing an embodiment.

FIG. 2 is a sectional view of a main part of a resin liquid tank showing another embodiment.

FIG. 3 is a sectional view of a main part of a resin liquid tank showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Insert fitting 3 Packing 4 Flange type fitting 5 Screw 11 Insert fitting

Claims (3)

(57) [Claims] 1. A flange-type pipe joint comprising a container for storing a liquid having an opening at the bottom center and an insert fitting buried around the opening and having a contact surface, and fixed to the contact surface. In the resin liquid tank connected to the outside, an insert fitting having a circumferential groove, a circumferential protrusion, and a screw hole in the contact surface is formed. A liquid tank made of resin, which is molded integrally with the container and embedded. 2. The resin-made liquid tank according to claim 1, wherein a peripheral convex portion having a step lower than the contact surface is provided on an inner periphery of the insert fitting, and a concave portion is provided on the surface. A resin-made liquid tank characterized by being filled with a resin of a container which is substantially flush with a contact surface of an insert fitting. 3. The resin-made liquid tank according to claim 1, wherein the abutment surface of the insert fitting protrudes from at least the outer bottom surface of the outer periphery of the container.