JP4480242B2 - Pipe connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure between pipe parts such as a vertical pipe and an invert part.
[0002]
[Prior art]
For example, the drop (1) shown in FIG. 1 comprises a riser pipe (2) and an invert (3) with a pipe receiving part (4) provided downward. If such a mold (1) is integrally injection-molded, the mold becomes large and expensive. Therefore, the riser pipe (2) having a simple shape is manufactured by extrusion molding to produce a long pipe, which is cut to a predetermined size, and the invert part (3) is produced by injection molding, and the riser pipe (2) is bonded to the riser pipe (2) with an adhesive. A method of bonding, a method of inserting the lower part of the riser pipe (2) into a mold, injection molding the invert part (3), and fusing it integrally to the riser pipe (2), etc. are considered.
According to the above method, since only the insert part is manufactured in the mold, the mold is not enlarged and the mold cost can be reduced.
[0003]
[Problems to be solved by the invention]
Such masculine is mainly made of vinyl chloride resin, but since vinyl chloride resins are poorly fused, the inverted part (3) is injection-molded at the end of the riser pipe (2) inserted in the mold. In this method, the bonding strength between the riser pipe (2) and the invert part (3) is not sufficient. The method of bonding the riser (2) and the invert part (3) with an adhesive takes time and effort to apply the adhesive, and the adhesive strength is not sufficient.
[0004]
[Means for Solving the Problems]
The present invention as means for solving the conventional problems described above, and inserted into an injection molding die (5) by applying a hot melt adhesive H to the end of the tube portion of the hand (2, 12), the other In the pipe connection structure in which the other pipe part ( 3, 13) is injection-molded , hot melt adhesive H is applied to the inner periphery of the connection end of the one pipe part (2, 12), and the other pipe part (3 , 13) is formed with a step (9, 19B) on the outer periphery of the connection end, and the step (9, 19B) on the outer periphery of the connection end of the other pipe (3, 13) is the one pipe (2) The pipe connection structure that is inside the connection end of (2,12), and an injection mold (5) by applying hot melt adhesive H to the end of one pipe (2,12) In the pipe connection structure in which the other pipe part (3, 13) is injection-molded, hot melt adhesive H is applied to the outer periphery of the connection end of the one pipe part (2, 12), and the other pipe part A step (9 ') is formed on the inner periphery of the connection end of the portion (3, 13). Provided is a pipe connection structure in which the step (9 ′) on the inner periphery of the connection end of the other pipe (3, 13) is outside the connection end of the one pipe (2, 12). Is.
For example, a relay pipe of the one pipe section (2, 12) Hamas (1, 11), a tube section of said other (3, 13) Hamas (1, 11) invert portion (3, 13) It is desirable to be.
The present invention is particularly useful when both the pipe portions (2 , 3 , 12, 13 ) are made of vinyl chloride resin.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention is shown in FIGS. This example relates to the drop (1). As shown in FIG. 1, the riser pipe (2) of the vinyl chloride resin is obtained by cutting a long pipe produced by extrusion molding into a predetermined dimension. The hot melt adhesive H is applied to the inner periphery of the lower end. The hot melt adhesive is selected to have good adhesion to a vinyl chloride resin. Examples of such hot melt adhesives include polyester adhesives, polyvinylidene chloride adhesives, and vinyl acetate-ethylene copolymers. Etc.
[0006]
The riser pipe (2) is inserted at its lower end into the mold (5) as shown in FIG. The mold (5) includes an outer mold (6), an upper inner mold (7), and a lower inner mold (8). The vinyl chloride resin similar to that of the riser pipe (2) is injected into the mold (5) to form the invert part (3) as shown in FIG. A step portion (9) is formed on the outer periphery of the upper end portion of the invert portion (3), and the invert portion (3) is formed at the lower end portion of the riser pipe (2) in the step portion (9) as shown in FIG. It is fused via a hot melt adhesive H.
[0007]
In this embodiment, the adhesive strength (tensile test) of the bonding portion between the riser (2) and the inverted portion (3) is 2.5 kN, and 1.5 kN when the hot melt adhesive is not applied, When 2) and the inverted part (3) were bonded together with an adhesive, it was 1.9 kN, and the adhesive strength was greatly improved in the present invention. In this embodiment, the step portion (9) of the invert portion (3) is placed inside the riser pipe (2) (inner winding). In this case, after the invert portion (3) is molded and removed, the invert portion ( 3) is slightly cooled and shrunk, and as shown by the arrow in FIG. 4, the step (9) moves away from the inner periphery of the riser pipe (2), but the hot melt adhesive H antagonizes this shrinkage. It stepped portions (9) are retained so as not away with.
[0008]
In the present invention, as shown in FIG. 6, the step portion (9 ′) of the invert portion (3) may be provided outside the riser pipe (2) (external winding).
[0009]
7 to 10 relate to the second embodiment of the present invention, and this embodiment relates to the step adjustment (11). The step adjustment (11) shown in FIG. 7 and FIG. 8 is composed of a riser pipe (12) and an invert part (13) from which a pipe insertion part (14) is inserted from the side, and as shown in FIG. A step (19A) is formed on the inner periphery of the lower end of (12), hot melt adhesive H is applied to the inner periphery of the step (19A), and the lower end of the riser pipe (12) is a mold. Inserted in (15). The mold (15) consists of an outer mold (16), an upper inner mold (17), and an inner mold (18) for forming a tube insertion portion, and the upper inner mold (17) is a riser pipe (12). It is inserted from the upper end opening part.
[0010]
When the invert portion (13) is molded by injecting resin into the mold (15), a step portion (19B) is formed on the outer periphery of the upper end portion of the invert portion (13), as shown in FIG. In the stepped portions (19A, 19B), the inverted portion (13) is fused to the lower end portion of the riser pipe (12) via a hot melt adhesive H.
[0011]
As shown in FIG. 7, a connecting portion mounting hole (20) is constricted in a predetermined portion of the riser pipe (12) of the step (11) which eliminates the step of the present embodiment, and a saddle (20) is formed in the mounting hole (20). A pipe connecting part (insertion part) (21) marked with 22) is attached.
[0012]
Even in the case of the present embodiment, the structure of the connecting portion of the riser pipe (12) and the invert section (13) may be the inner winding shown in FIG. 5 or the outer winding shown in FIG. However, in the case of the present embodiment, the pipe connection part (21) may be attached at the position of the connection part, and in this case, if it is externally wound, the saddle (22) of the pipe connection part (21) interferes and the pipe connection part (21) becomes difficult to install.
[0013]
【The invention's effect】
In the present invention, since the pipe connection portions are connected to each other via a hot melt adhesive, a high adhesive strength can be obtained even in the case of a resin having poor fusion properties such as a vinyl chloride resin.
[Brief description of the drawings]
1 to 5 show a first embodiment of the present invention.
[Figure 1] Drop perspective view [Figure 2] Rise pipe insert state mold side cross section [Figure 3] Invert part injection molding state mold side cross section [Figure 4] Drop drop side cross section [Figure 5] Connection part Enlarged sectional view FIG. 6 is an enlarged sectional view of a connecting portion of another structure. FIGS. 7 to 10 show a second embodiment of the present invention.
[Fig. 7] Perspective view that eliminates the step [Fig. 8] Disassembled perspective view that eliminates the step [Fig. 9] Cross-sectional side view explaining the forming of the invert part [Fig.
1,11 will
2,12 Rise pipe (pipe part)
3,13 Invert section (pipe section)
5,15 Mold
9,19A, 19B Step H Hot melt adhesive

Claims (4)

Was inserted into an injection molding mold by applying hot melt adhesive to the end of the tube portion of the hand, in the tube connection structure were injection molded pipe part of the other hand, the connection end portion periphery of the one pipe section the A hot melt adhesive is applied to the outer periphery of the connection end of the other tube, and a step is formed on the outer periphery of the connection end of the other tube. A pipe connection structure characterized by being inside. In a pipe connection structure in which a hot-melt adhesive is applied to the end of one pipe part and inserted into an injection mold, and the other pipe part is injection-molded, the hot melt is applied to the outer periphery of the connection end of the one pipe part. Adhesive is applied, a step is formed on the inner periphery of the connection end of the other tube, and the step on the inner periphery of the connection end of the other tube is outside the connection end of the one tube. A pipe connection structure characterized by being made. The pipe connection structure according to claim 1 or 2 , wherein the one pipe part is a further connecting pipe, and the other pipe part is an inverted part . The pipe connection structure according to any one of claims 1 to 3, wherein both the pipe parts are made of vinyl chloride resin .

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