JPH11210949A - Branch piping structure for gas service - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure to easily connect a metallic flexible pipe for gas service to a header joint, in a branch piping structure wherein a header joint, to which a metallic flexible pipe extending to a gas use spot is connected, is connected to a gas service pipe. SOLUTION: This branch piping structure for gas service is formed such that a header joint to which a metallic flexible pipe extending to a gas use spot is connected is connected to a gas service pipe. The branch piping structure has a union joint 1 comprising a union unit 11; a union flange 12 with a male screw connected to one end of the union nut 11; and a union elbow 13 connected to the other end of the union nut 11. The union flange 12 is connected to the header joint, and the union elbow 13 is connected to the metallic flexible pipe 2 for gas service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a pipe for drawing gas into a gas consumer such as a house, and more particularly to a branch pipe structure for branching a gas drawing pipe from a gas meter at a header joint.

[0002]

2. Description of the Related Art Conventionally, so-called steel pipes for gas have been used as indoor piping for city gas or the like. However, in recent years, metal pipes or pipes have not been cut or threaded at the time of piping. Flexible tubes (bellows tubes) made of synthetic resin or the like have come to be used frequently. In piping using a flexible tube of metal or the like, a header joint having a plurality of connection ports is connected to a stage subsequent to the gas meter, and each connection port has a joint portion for connecting the flexible tube. I have. Therefore, each of the header joints is connected by a single flexible pipe from each connection port to each gas use point in the house, and no pipe joint is required between the header and the connection device at the use point. . In addition, piping work and subsequent piping management have also become easier. As described above, the indoor piping is becoming a flexible tube, but the lamp tube up to the header joint is still a pipe using a steel pipe for gas, so it is a bottleneck in the piping work. I have.

[0003] Such a drawing pipe is, for example, shown in FIG.
The structure is as shown in FIG. Here, reference numeral 41 denotes a header joint, and a plurality of connection ports of the header joint are each provided with a joint 42 for a flexible pipe. This flexible pipe joint 42
And a flexible pipe 43 is connected to each gas use point.
5 is a gas meter, 6 is a lamp outside supply pipe, and 7 is a meter cock. As the piping of the buried portion up to the gas meter 5, a polyethylene pipe is gradually used, and the buried pipe in the lamp branched by the service tee 60 from the polyethylene external supply pipe 6 is a polyethylene pipe 61. The pipes 64 and 66 before and after the meter cock 7 are steel pipes for gas, and the rising part from the polyethylene pipe 61 to the gas meter 5 has:
A transition joint 63 for connecting the polyethylene pipe 61 and the steel pipe for gas 64 is connected via an electrofusion joint 62. Next, the steel pipe for gas 64
An insulating joint 65 is used to cut off the current between the gas meter 5 and the gas meter 5, and the connection to the gas meter 5 via the meter cock 7 is performed using the meter joint 51.

Next, between the gas meter 5 and the header joint 41, via a meter joint 52, a gas steel pipe 53, a measuring joint 54, and an insulating joint 55, a buried portion is coated with a vinyl chloride resin to prevent corrosion. Steel pipe 56, resin-coated joint 57
And is connected to the union joint 45 by piping up to the side of the header joint 41. In this figure, the resin-coated joint 5
7 and the union joint 45 are connected via a union flange with a male thread on the union joint 45 or a union flange with a female thread via a pipe nipple. The union joint 45 and the header joint 41 are connected via a nipple 44.

[0005]

The piping from the header joint 41 to each gas use point uses a flexible tube 43, so that the piping is simple and the piping work has been facilitated. However, the piping after the gas meter 5 and the piping around the header joint 41 have many parts and remain troublesome. Therefore, it is conceivable that various kinds of connecting devices required between the gas meter 5 and the header joint 41 are replaced with a metal flexible tube, thereby simplifying the piping and simplifying the piping work. However, connecting with a flexible metal tube requires a plumbing device suitable for the connection.

Therefore, according to the present invention, a branch pipe structure of a gas inlet pipe including a header joint to which a metal flexible pipe connected to each gas use point is connected, and the metal inlet pipe is easily connected to the header joint. It is an object of the present invention to provide a piping structure that can be used.

[0007]

According to the present invention, there is provided a branch pipe structure for gas drawing, in which a header joint to which a metal flexible pipe extending to a gas use location is connected is connected to the gas drawing pipe. A union joint having a nut, a threaded union flange connected to one end of the union nut, and a union elbow connected to the other end of the union nut, wherein the union flange is a header joint And the union elbow is connected to a metal flexible tube for drawing gas.

Here, usually, since there are a plurality of gas use places, a plurality of metal flexible tubes are connected to the header joint. Further, it is preferable that the union flange screw is directly connected to the header joint. The union elbow can be fixed by attaching one straight pipe part of the union elbow to a support part with a fixing bracket, or by attaching a mounting base directly to the union elbow and attaching it to the support part.

Further, in the gas inlet branch pipe structure of the present invention, the opening of the union elbow connected to the gas inlet metal flexible tube faces the ground (usually downward). Is preferred.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a gas inlet branch pipe structure according to the present invention. FIG.
FIG. 2 is an explanatory diagram of piping around a gas meter including the branch piping structure for gas drawing-in of the present invention. FIG. 2 is a side view of a union joint used in the present invention. The connection with the flexible tube is a sectional view. In addition, the connection part with a flexible tube shows the left half before screwing a lock nut, and the right half after screwing a lock nut. FIG. 3 is an enlarged cross-sectional view of a connection portion of the union joint shown in FIG. 2 with a flexible tube, and the left-right relationship is the same as FIG. In these figures, the same parts as those in FIG. 4 illustrating the related art are denoted by the same reference numerals.

FIG. 1 is an explanatory view of a piping around a gas meter including a branch piping structure for drawing gas according to the present invention. In FIG. And between the gas meter 5 and the metal flexible tube 6 via a transition joint 67 connecting the polyethylene tube and the metal flexible tube.
The pipe 8 is connected to the gas meter 5 via a meter cock 7a.

On the other hand, from the gas meter 5 to the header joint 41
Between them, a metal flexible tube 2 and a union joint 1 are used for piping. In the portion where the metal flexible tube 2 is buried in the soil, it usually passes through a conduit tube 21 indicated by a dotted line. From the header joint 41 to each gas use point, a flexible pipe 43 is connected via a flexible pipe joint 42 attached to each connection port of the header joint 41 as in the related art.

As shown in FIG. 2, the union joint 1 has a union nut 11 and a threaded union flange 12 attached to one end of the union nut 11, and a union elbow 13 is connected to the other end of the union nut 11. Union Tsuba with Male Thread 1
2 is directly connected to the header joint 41 by its male screw 121.
It is screwed into a female screw. The union flange and the header joint may have opposite male and female threads. The union elbow 13 is provided with a connection portion 131 with the metal flexible tube at the other end integrally facing downward (toward the ground).

As shown in FIG. 3, a connection portion 131 of the union elbow 13 with the metal flexible tube is provided with a female screw 1 on the inner surface of the tube end opening.
A lock nut 14 provided with a male screw 141 to be screwed with the lock nut 32 is screwed in advance. However, between the lock nut 14 and the connection portion 131 of the union elbow 13 is temporarily fixed with a C-shaped ring 142 before the connection in order to maintain the position of the lock nut 14 with respect to the connection portion 131. A refractory packing 16 is fitted into a step portion at the back of the tube end opening of the connection portion 131, and when the flexible metal tube 2 is inserted into the opening, the refractory packing 16 abuts on the refractory packing 16. Further, a lock ring 15 having a protruding portion whose tip is directed inward is fitted in the opening.
A claw is attached to the tail end of the lock ring 15, and the lock nut 15 is caught in an inner concave groove 143 (however, this may be an outer concave groove). Even if it is pushed to the back side, it will prevent it from going any further.

Here, the metal flexible tube 2 is inserted into the tube end opening of the connection portion 131 with the metal flexible tube in the state shown in the left half of FIG.
(If the outer circumference of the stainless steel bellows flexible tube is covered with vinyl chloride resin or the like, save the portion to be inserted.) Insert the fireproof packing 1 at the back step.
Make sure it hits 6. At the time of insertion of the metal flexible tube 2, one or several peaks of the distal end of the lock ring 15 are made to protrude over the flexible tube (one peak in this example). When the flexible tube 2 passes through the protrusion of the lock ring 15, the peak of the flexible tube 2 may interfere with the protrusion of the distal end, and the lock ring 15 may be pulled toward the back. If you make a slit in 15 vertically,
When the interference occurs, the protrusion is opened to allow the flexible tube 2 to pass.
In addition, since the lock ring 15 has a claw at the tail end, the lock ring 15 is caught by the lock nut 14 and stops, so that the flexible tube 2 does not move backward. Next, the C-shaped ring 142
Is removed, and the lock nut 14 is turned to tighten the female thread 132 on the inner surface of the tube end of the connecting portion 131.
Push the end of the to the back. The diameter of the lock ring 15 is also reduced by the tapered opening wall in which the radius of the lock ring 15 is reduced toward the back of the opening. Then, the portion of the metal flexible tube 2 deeper than the protrusion is crushed by the protrusion inside the radius at the tip of the lock ring 15 between the protrusion and the refractory packing 16, and the metal flexible tube 2 is pressed. The space between the flexible tube 2 and the refractory packing 16 is sealed.

The union elbow 13 integrally has the connection portion 131 with the flexible metal tube as described above, so that the flexible metal tube 2 is inserted into the union elbow 13 to lock the lock nut 14. Just by tightening, the metal flexible tube 2 can be easily connected to the union elbow 13. For this reason, it is possible to connect before or after fixing the union elbow 13 to the support portion.

The header joint 41 and the union joint 1
In order to attach the incoming piping combined with
One of the straight pipes in the longitudinal direction of the union elbow 13 of the union joint 1 may be attached to the support part by the fixing bracket 3 such as a band. Therefore, it is preferable that one straight pipe portion of the union elbow 13 is slightly longer than the other, and the fixing fitting 3 is attached to the longer straight pipe portion. Alternatively, the union elbow 13 is made of a casting such as malleable cast iron, and the mounting base is union elbow 1
It is convenient to cast the three parts together with a casting.

In the above example, the external thread 121 of the union flange 12 of the union joint 1 is directly connected to the header joint 41.
Although the description has been given of the structure connected to the female screw, a bushing having a male screw and a female screw can be provided between the female screw and the female screw if necessary. However, there is no distance constraint between the union joint 1 and the header joint 41 itself,
In order to make the structure as simple as possible, direct connection is preferred. Further, it is preferable that the connecting portion 131 to the metal flexible tube has an insulating function.

As shown in FIG. 1, the gas meter 5 is often installed outdoors for meter reading. In the case of a detached house, the pipe from there is buried once, then started up and connected to the header joint 41. Often. in this case,
Since the connection portion 131 of the union elbow 13 of the union joint 1 used in the present invention with the metal flexible tube faces the ground, piping becomes easy.

[0020]

According to the branch piping structure for gas drawing of the present invention, the gas meter and the header joint can be connected by a flexible tube made of metal or the like without the need for a conventional steel pipe or nipple joint. It has become easier and piping work has been simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of piping around a gas meter including a branch piping structure for drawing gas according to the present invention.

FIG. 2 is a side view showing an upper half of a union joint used in the present invention in a sectional view.

FIG. 3 is an enlarged cross-sectional view of a connection portion of the union joint shown in FIG. 2 with a flexible tube.

FIG. 4 is an explanatory diagram of a conventional piping structure for drawing in around a gas meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Union joint 11 Union nut 12 Union flange with a male thread 121 Male thread 13 Union elbow 131 Connection part with a metal flexible tube 132 Female thread 14 Lock nut 141 Male thread 142 C-shaped ring 143 Inner concave groove 15 Lock ring 16 Fireproof packing 2, 68 Metal flexible tube 21 Conduit tube 3 Fixing bracket 41 Header joint 42 Joint for flexible tube 43 Flexible tube 44 Nipple 45 Union joint 5 Gas meter 51, 52 Meter joint 53, 64, 66 Steel pipe for gas 54 Testing joint 55 , 65 Insulation joint 56 Vinyl chloride resin-coated steel tube 57 Resin-coated joint 6 External lamp supply tube 60 Service tube 61 Polyethylene tube 62 Electrofusion joint 63, 67 Transition joint 7, 7a Meter cock

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16L 41/08 F16L 33/00 B F23K 5/00 301

Claims (5)

[Claims] In a branch piping structure in which a header joint to which a metal flexible pipe extending to a gas use location is connected is connected to a gas drawing pipe, a union nut is connected to one end of the union nut. It has a union joint having a threaded union flange and a union elbow connected to the other end of the union nut, wherein the union flange is connected to a header joint, and the union elbow is for drawing in gas. A branch piping structure for gas drawing, which is connected to a metal flexible tube. 2. The gas inlet branch piping structure according to claim 1, wherein said union flange external thread is directly connected to a header joint. 3. The gas inlet branch pipe structure according to claim 1, wherein one straight pipe portion of the union elbow is attached to a support portion by a fixing bracket. 4. The branch piping structure for gas intake according to claim 1, wherein a mounting base is formed on the union elbow, and the mounting base is mounted on a support portion. 5. The gas drawing device according to claim 1, wherein a port of the union elbow connected to the gas drawing metal flexible tube faces the ground. Branch piping structure.