JP3724667B2 - Plastic branch header - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch header used when a plurality of branch pipes are taken out from a main pipe, and more particularly to a resin branch header capable of connecting an electrofusion joint.
[0002]
[Prior art]
Conventionally, a branch header is often used when a plurality of branch pipes are taken out from a main water supply / hot water supply pipe and water and hot water are distributed to a bath or kitchen. For example, as shown in FIG. 6, the branch header has a cylindrical body 50 having a connection port 51 with the main pipe at one end and closed at the other end, and protrudes at right angles to the axis of the cylindrical body 50. And a plurality of cylindrical branch ports 52 to 55. In many cases, the branch port is usually one having 4 to 6 ports. Recently, plastic pipes (polyethylene, polybutene, etc.) using electrofusion joints are becoming mainstream, and this branch header is also made of a resin header made of a thermoplastic resin.
[0003]
However, in the conventional branch header, a certain number of branch ports are provided in advance so that a fixed number of 4 to 6 ports are integrally protruded in a certain direction. There was a disadvantage that the branch pipes could not be taken out in different directions. For example, as shown in FIG. 7, the direction of the branch ports 55 and 54 is suitable for the points a and b, but the direction of the branch ports 53 and 52 is inconvenient and impossible for the points c and d. There was a problem that there was no choice but to use wasteful piping.
[0004]
[Problems to be solved by the invention]
For this reason, for example, a branch header disclosed in Japanese Utility Model Laid-Open No. 5-77694 shown in FIG. 5 has been proposed. This branch header 60 has a T-type branch joint 64 having an electro-fusion type receiving port portion 62 with a heating wire 61 embedded at one end and a differential port portion 63 that can be fitted into the receiving port portion 62 at the other end. Alternatively, a T-type branch joint 64 ′ having an electro-fusion type outlet portion with a heating wire embedded at one end and a receiving portion receiving the outlet portion at the other end is prepared. The T-type branch joints 64 and 64 'were connected and piped flexibly by combining the number and direction of the branch ports.
[0005]
However, in this branch header, the above-mentioned T-type branch joint is fusion-bonded with an appropriate combination of number and direction when piping is constructed on-site, so it takes extra time and laborious work. In fact, it is not welcomed on site. In addition, once the fusion connection is made, it is difficult to use the change, and in particular, the direction cannot be changed.
[0006]
This invention solves such a problem, and it aims at providing the resin-made branch header which made the trunk | drum containing a branch port rotatable in a division | segmentation unit, and was able to select a taking-out direction suitably. .
[0007]
[Means for Solving the Problems]
The present invention relates to a resin branch header having a connecting portion at one end and a closed end at the other end and n branch ports protruding from the trunk portion, and the body portion is divided between the branch ports. 2 to n divided bodies made of thermoplastic resin, made of a material incompatible with the thermoplastic resin, arranged on the inner diameter side of each divided body, and a connecting member for connecting the divided bodies; A seal ring disposed between the connecting member and each of the divided bodies; and a cylindrical sleeve made of a thermoplastic resin adapted to compress the seal ring from the outer periphery, wherein each of the divided bodies is a seal It is a resin branch header that is rotatably connected to a connecting member via a ring.
[0008]
As described above, the divided bodies are connected to each other by the connecting member via the seal ring. However, since the divided body and the connecting member are not compatible with each other, they are connected so as not to come off in the axial direction. However, the rotation around the axis can be rotated without any binding force. Therefore, since the branch port can be rotated in a convenient direction for each unit of the divided body, the branch pipe itself can also be taken out without difficulty by selecting a rational direction.
[0009]
In addition, a seal ring is interposed between the rotating sliding surfaces of the connecting member and the divided body to obtain water tightness. However, if a sleeve is further interposed to apply a compressive force to the seal ring, the seal ring Fills the gap between the sleeve and the groove of the connecting member to improve the sealing performance. At the same time, when the body (divided body) is molded by injection molding, it is possible to avoid the molten resin from coming into contact with the seal ring and thermally deteriorating.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a resin branch header showing one embodiment.
The present embodiment includes a trunk portion 2 of a branch header 1 having four branch ports, a split body 2A having a closed end 22, branch ports 3a and 3b, a connection port 21, and branch ports 3c and 3d. The divided body 2B is divided into two parts, and the divided body 2A and the divided body 2B are connected by the connecting member 4 via the O-ring 5. Here, a thermoplastic resin such as polybutene, polyethylene, polyvinyl chloride (polyolefin resin), etc. is used as the material of the divided bodies 2A and 2B, and a material such as bronze, stainless steel or engineering is used as the material of the connecting member. A material that is not compatible with the thermoplastic resin, such as plastic, is used.
[0011]
Protruding portions 41 are provided at both ends of the connecting member 4 to form a concave groove 42, and an O-ring 5 is mounted in the concave groove 42. The projecting portion 41 (concave groove) functions to prevent the protrusions from moving in the axial direction when the divided body 2A and the divided body 2B are connected and molded.
The split body 2A and the split body 2B of the branch header 1 are integrally formed by injection molding, but the split bodies 2A and 2B are separated and independent from each other so as not to move in the axial direction by the connecting member 4. Connect to restraint. However, since the divided bodies 2A and 2B and the connecting member 4 are not compatible with each other, they are not integrated at the time of injection molding, and are weak against rotational force. Separation and rotation are possible. Therefore, it can be rotated by hand while maintaining watertightness by the O-ring 5 thereafter.
[0012]
Next, another embodiment of the present invention will be described with reference to FIGS. 2 is a cross-sectional view of a resin branch header 6 having five branch ports, FIG. 3 is an enlarged cross-sectional view of a connecting portion, and FIG. 4 is a molding view including a mold.
In this example, the branch header 6 having five branch ports is divided into two and three ports, and a divided body 7A having a closed end 72 and branch ports 8a and 8b, a connection port 71 and a branch port 8c. , 8d, 8e. These divided bodies 7A and 7B are molded from a thermoplastic resin material (for example, polybutene) in the same manner as in the above embodiment, while the connecting member 9 is made of a material (for example, bronze) that is not compatible with this thermoplastic resin material. Become. Further, the connecting member 9 has a cylindrical shape, and both ends thereof are formed with projections 91 and 91 that prevent axial movement and prevent them from coming off, and O-rings 5 and 5 that are seal rings are mounted adjacent thereto. Concave grooves 92, 92 are provided.
Further, in this example, cylindrical sleeves 10a and 10b made of a thermoplastic resin compatible with the divided bodies 7A and 7B, preferably the same resin material (for example, polybutene) are compressed by the O-rings 5 and 5. The outer periphery of the lever is fitted.
[0013]
In order to mold the resin branch header 6, first, the O-ring 5 is mounted in the concave groove 92 of the connecting member 9, and the sleeves 10 a and 10 b separately molded are compressed on the O-rings 5 and 5 and the outer peripheral surface thereof. Attach to. Next, the connecting member 9 is mounted on a core C1 as shown in FIG. 4, and this core is placed at a predetermined position in the injection molds D1 and D2, and at the same time, the cores C2 to C6 (C5 and C6 are shown in the figure). A cavity 70 is formed as a result. Then, after the molds D1 and D2 are closed, molten resin is injected into the cavity 70 from an injection gate port (not shown) in the direction perpendicular to the paper surface, and the divided bodies 7A and 7B are formed. At this time the molten resin is in contact with the sleeve 10 a, 10 b in the cavity 70, its surface is melted together each divided body 7A, are integrated and 7B and the sleeve 10 a, 10 b. However, the molten resin in the O-ring 5 on the inside than the sleeve 10 a, 10 b do not make contact.
Thereafter, when the cavity portion 70 is cooled and solidified, the molds D1 and D2 are opened, the cores C1 to C6 are removed, and the branch header 6 is taken out.
[0014]
According to the present embodiment, the seal rings 5 and 5 can be sufficiently compressed by the sleeves 10a and 10b that are pre-shaped and mounted, and the molten resin does not directly contact the seal ring, so there is no thermal deterioration, and the connecting member and the sleeve The gap is sufficiently sealed to improve the sealing performance. Further, since the sleeves 10a and 10b and the divided bodies 7A and 7B are integrated by melting each other, there is no gap between them. On the other hand, since the connecting member 9 and the sleeves 10a and 10b are not integrated, the divided bodies 7A and 7B can be rotated with each other if a rotational torque is applied after molding.
In each of the above-described embodiments, the branch port is divided into 2 to 2 or 2 to 3, but this is divided into 1 to 1 and 2 or 3 or 1 to 1 to 1 and 2. There may be four divisions, and the number of divisions can be changed as appropriate.
[0015]
【The invention's effect】
As described above, according to the resin-made branch header of the present invention, the piping can be taken out in a convenient direction according to the situation at the time of construction on site, so that the workability is good.
[Brief description of the drawings]
FIG. 1 is a sectional view of a resin branch header showing an embodiment of the present invention.
FIG. 2 is a sectional view of a resin-made branch header showing another embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of a connecting portion in FIG. 2;
FIG. 4 is a mold forming diagram for explaining the forming method of the embodiment.
FIG. 5 is a cross-sectional view showing an example of a conventional resin branch header.
FIG. 6 is a cross-sectional view showing an example of a branch header.
FIG. 7 is a diagram illustrating an example in which a pipe is taken out from each branch port.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 6 ... Resin branch header 2A, 2B, 7A, 7B ... Divided bodies 3a-3d, 8a-8e ... Branch port 4, 9 ... Connecting member 5 ... Seal ring (O-ring) 10a, 10b ... Sleeve
41, 91 ... Projection 42, 92 ... Concave groove
21, 71 ... Connection port 22, 72 ... Closed end
50 ... trunk 52 ~ 55 ... branch
61 ... Heating wire 62 ... Receiving part
63 ... Deck 64 ... Electro-fusion T-type branch joint
70 ... Cavity C1-C4 ... Core D1-D3 ... Mold

Claims (1)

In a resin branch header having a connection port at one end and a trunk portion closed at the other end, and n branch ports protruding from the barrel portion,
Dividing the body part between the branch ports, forming a divided body made of 2 to n thermoplastic resins, made of a material incompatible with the thermoplastic resin, arranged on the inner diameter side of each divided body, A connecting member for connecting the respective divided bodies, a seal ring disposed between the connecting member and each of the divided bodies, and a cylindrical sleeve made of a thermoplastic resin that compresses the seal ring from the outer periphery. And each of the divided bodies is rotatably connected to a connecting member via a seal ring.

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