JP2001065773A - Branch saddle with fuse function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch saddle with a fuse function having proper responsiveness of a fuse function when a secondary side piping becomes excessive outflow, for surely cutting off the piping at the time of abnormality, facilitating piping work in taking out and piping a branch pipe from an original piping, and ensuring safety. SOLUTION: In a branch saddle connected to the surface of an original piping 1 and taking out and piping a branch tube, a drill tube part 12 for drilling the piping 1 and a taking out tube part 13 communicating with a drilled hole to take out the branch tube are provided on a saddle part 11 connected to the piping 1, and the tube part 13 automatically closes a passage when a pressure difference between upstream and downstream sides becomes a given difference or more. This saddle is provided with: the saddle part 11 connected to the surface of the piping 1, the tube parts 12 and 13 standing upright from the saddle part 11, a communication recess groove 14 for connecting the tube parts 12 and 13, a tapping cutter 20 mounted on the tube part 12, and a fuse valve mechanism 30 for closing the passage in the tube part 13 when the pressure difference between upstream and downstream sides becomes a given difference or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch saddle joint for taking out a branch pipe from an existing pipe through which a fluid such as a gas flows, and more particularly to an overflow state such as a breakage of a secondary side pipe. The present invention relates to a branch saddle with a fuse function that can automatically shut off a flow passage in a saddle joint in the event of an emergency and prevent a secondary disaster on the downstream side and ensure safety.

[0002]

2. Description of the Related Art Conventionally, there is one shown in FIG. 5 disclosed in Japanese Utility Model Laid-Open No. 2-128892. This is one in which a butterfly check valve is built in the perforated pipe portion of the branch extraction joint.

[0003]

The above-mentioned conventional branch take-out joint has a rotating shaft at one end of a plate-shaped valve body.
A plate-shaped valve element is provided with a butterfly check valve that closes a valve port. In this butterfly type valve structure, the response performance of opening and closing due to the flow and pressure difference of the fluid is difficult to respond until a certain pressure of the fluid is received. The disadvantage is that the body is less susceptible to pressure and thus does not respond sensitively and thus does not function as an effective emergency shut-off valve. In addition, since it affects the gravitational force of the plate-shaped valve element, it greatly affects the installation state.

[0004] The present invention solves the above-mentioned problems, and has a good responsiveness of the fuse function when the secondary side piping over-flows,
Provided is a branch saddle with a fuse function, which is surely shut off in case of abnormality, takes out a branch pipe from the original pipe, and facilitates pipe construction when piping, and ensures safety.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a branch saddle which is connected to the surface of an original pipe and takes out and pipes a branch pipe. An extraction pipe section for extracting the branch pipe is provided in a saddle section connected to the original pipe, and the extraction pipe section automatically closes the passage when the pressure difference between the upstream side and the downstream side becomes a predetermined value or more. This is a branch saddle with a fuse function, which is provided with a fuse mechanism. Further, the present invention provides a saddle portion connected to the surface of the original pipe, a perforated pipe portion erecting from the saddle portion, an extraction pipe portion erecting from the saddle portion, and a communication concave groove communicating with the perforated pipe portion and the extraction pipe portion. And a tapping cutter attached to the perforated pipe portion, and a fuse mechanism provided with a fuse mechanism for closing the passage in the extraction pipe portion when the pressure difference between the upstream side and the downstream side becomes greater than or equal to a predetermined value. This is a branch saddle with functions.

[0006]

According to the present invention, when a branch pipe is taken out of a main pipe and a pipe is taken out from the main pipe, a saddle portion is connected to the surface of the main pipe, and a tapping cutter of a perforated pipe section is used to perforate the pipe surface. The saddle portion is provided with a perforated tube portion and a take-out tube portion. Gas from the perforated portion perforated by the tapping cutter flows to the take-out tube portion, and is branched and taken out to a branch pipe connected to the take-out tube portion. When the pressure difference between the upstream side and the downstream side becomes more than a predetermined value, the passage in the branch pipe section closes. For this reason, in the event that a large amount of gas is blown out due to some abnormality in the branch-side piping after the extraction pipe, the extraction pipe is automatically closed to prevent a major accident.

Further, a perforated pipe section and a take-out pipe section stand upright from the saddle section, and the perforated pipe section and the take-out pipe section communicate with each other through a communication concave groove. The original pipe is formed by a tapping cutter mounted on the perforated pipe section. When the gas is pierced, the gas in the pierced portion flows to the outlet tube. The take-out pipe is provided with a fuse valve that closes the passage when the pressure difference between the upstream side and the downstream side exceeds a predetermined value.Therefore, when there is some abnormality on the downstream side, a large amount of gas is ejected. , The passage of the take-out pipe is closed,
Prevent major accidents.

Further, if a small hole is formed in the valve body, the fluid flows little by little from the upstream side to the downstream branch pipe portion, and when the repair of the gas ejection portion of the downstream pipe is completed, the fluid flows to the downstream pipe. The flow gradually increases the downstream pressure and eliminates the pressure difference between the upstream side and the downstream side of the valve body seated on the valve seat member, so that the abnormally closed valve body is automatically opened. Therefore, there is no need to dig the buried saddle portion to operate the shut-off valve mechanism, and the shut-off valve mechanism is automatically restored to the circulation state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a branch saddle with a fuse function according to an embodiment of the present invention, and shows a state where the saddle is connected to the surface of a main pipe 1. The branch saddle body 10 is made of cast iron or resin, and in the case of resin, a heating wire is embedded in the inner peripheral surface of the saddle portion 11 so as to be fused to the resin-made pipe 1. A perforated pipe section 12 and an extraction pipe section 13 penetrating the inner surface of the saddle section 11 are provided upright. A gas passage is formed between the perforated pipe section 12 and the extraction pipe section 13 by a communication concave groove 14. ing.

[0010] The perforated pipe section 12 is provided with a female screw 15 on the inner peripheral surface thereof, and is provided with a tapping cutter 20 screwed to the female screw 15. The tapping cutter 20 has a feed screw 21
An operation jig is inserted from the upper end of the perforated tube portion 12 to rotate the feed screw portion 21 and screw into the female screw 15 of the perforated tube portion to advance and retreat the forsaw 22 with respect to the original pipe 1. Let it. After piercing the original pipe 1, the piercing pipe section 12 is rotated again by holding the section in the
And the drilling operation is completed. After the end, the cap 16 is attached to the upper end, and the perforated pipe section 12 is closed.

The take-out tube portion 13 has a fuse unit 30 mounted on the inner surface, and a branch tube portion 17 is formed at an end thereof. The end of the take-out tube 13 is closed by a lid 18. A branch extraction pipe is connected to the branch pipe section 17.
FIG. 2 shows another embodiment, in which a branch pipe is directly connected to the discharge pipe section 13. In this case, the branch pipe section 17 of the embodiment of FIG. Otherwise, the rest is the same as the previous embodiment. The thickness of the take-out pipe portion 13 where the fuse unit 30 is mounted is provided at a thicker thickness 29 from the end side, so that even if external force such as bending stress is applied to the branch take-out pipe, the external force exerts on the fuse unit 30. Is provided so as not to exceed.

FIGS. 3 and 4 show the fuse unit 30 according to the embodiment of the present invention mounted on the take-out tube portion 13, showing a normal use state. A C-ring 4 is provided on the inner peripheral surface of the take-out pipe part 13.
2, a case 31 is hermetically fitted, and a valve member 32, a coil spring 33, and a retaining ring 34 are provided in the case 31 so that the valve member 32 is slidably provided in the axial direction. A valve seat surface 39 on which the body 38 sits is formed. Further, the valve member 32 is supported by a step portion on the inner surface of the case 31 so as not to open more than a predetermined amount, so that the valve body 38 does not open more than a predetermined amount with respect to the valve seat 39. In the valve member 32, the outer peripheral sliding ring 35 and the central valve shaft 36 are integrated by a rib 37,
A valve body 38 is connected to the valve shaft 36. A fluid passage is provided between the sliding ring 35 and the rib 37 of the valve shaft 36, and the retaining ring 34 is screwed into the case 31 to hold the coil spring 33. Therefore, the valve member 32 is urged by the coil spring 33 and slides inside the case 31 integrally with the valve body 38. Valve body 3
When 8 comes into contact with the valve seat 39 provided at the end of the case 31, the flow path in the case 31 is closed, and the flow path of the take-out pipe 13 is closed.

When the pressure of the primary side flow path, for example, the communicating groove 14 becomes larger than the predetermined pressure of the secondary side flow path, for example, the branch pipe section 17, the valve body 38 compresses the coil spring 33. And the fuse unit 30 is seated on the valve seat 39.
Closes. Therefore, if a large amount of gas is blown out due to some abnormality on the branch pipe 17 side, the secondary pressure drops sharply compared with the primary pressure, so that the fuse unit 30 is automatically closed to ensure safety. Is done.

A small hole 40 is made in the valve body 38,
Even when the valve is seated on the valve seat 39 and is closed, the gas flows little by little to the branch pipe on the downstream side. For example, 2
When the construction of the abnormal state of the secondary side pipe is restored and the abnormal leakage part of the secondary side pipe is repaired, the gas gradually flows from the small hole 40 provided in the valve body 38 to the downstream branch pipe section 17 side, and gradually. The pressure in the secondary pipe rises and balances with the pressure in the primary pipe. When the pressure difference between the upstream side and the downstream side disappears, the valve body 38 separates from the valve seat 39 due to the repulsive force of the coil spring 33, and returns to the normal flow state. In the present invention, since no valve mechanism is provided in the horizontal pipe of the branch pipe section 17, damage to the fuse valve unit section is prevented even when bending force such as land subsidence or hooking with a shovel acts on the horizontal pipe. And long-term reliability is ensured.

[0015]

As described above, the branch saddle with the fuse function according to the present invention can easily perform drilling work on the original piping in the drilling pipe portion as in the prior art, and can reduce the possibility of branch pipe side secondary piping. It can deal with abnormal situations and ensure safety.
In addition, since the perforated pipe section and the take-out pipe section stand upright from the saddle section separately, the workability of drilling work and branch take-out pipe is good, and the rotation angle of the perforated pipe section and the take-out pipe section from the saddle section can be changed. Therefore, it can be provided so as to take out the branch extraction pipe in the horizontal direction by drilling work from the ground, and can cope with various piping conditions. Also, safety is ensured. Further, since the fuse valve mechanism is not provided in the horizontal pipe portion on the branch pipe side, even if a bending force acts on the branch pipe, damage to the fuse mechanism is prevented, and long-term reliability is secured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a normal use state after perforating a main pipe, showing one embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention, showing a normal use state after perforating the original pipe.

FIG. 3 is a sectional view showing a fuse unit 30 in FIGS. 1 and 2;

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a sectional view of a branch saddle showing a conventional technique.

[Explanation of symbols]

1 source piping 2 section 10 branch saddle 11 saddle-shaped saddle part 12 perforated pipe part 13 take-out pipe part 14 communication concave groove 16 cap 17 branch pipe part 20 tapping cutter 21 cutter feed screw part 22 cutter forsaw 30 fuse unit 31 case Reference Signs List 32 valve member 33 coil spring 34 retaining ring 35 sliding ring 36 valve shaft 37 rib 38 valve body 39 valve seat

Continued on the front page (72) Inventor Ken Kato 2 Daifuku, Kuwana-shi, Mie, Hitachi Metals, Ltd. Kuwana Plant (72) Inventor Shinichi Fujita 2nd Daifuku, Kuwana-shi, Mie, Hitachi Metals, Kuwana Plant F-term (reference) ) 3H019 BB02 CB01 GA03

Claims (2)

[Claims] 1. A branch saddle connected to the surface of a source pipe to take out and branch a branch pipe, wherein a pipe section perforates the source pipe and a take-out pipe section communicating with the hole pipe to take out the branch pipe. Is provided in a saddle portion connected to the original pipe,
The branch saddle with a fuse function, wherein the take-out pipe section is provided with a fuse mechanism for automatically closing a passage when a pressure difference between an upstream side and a downstream side becomes a predetermined value or more. 2. A saddle portion connected to a surface of the original pipe,
A perforated pipe section erecting from the saddle section, a take-out pipe section erecting from the saddle section, a communication concave groove communicating the perforated pipe section with the take-out pipe section, a tapping cutter mounted on the perforated pipe section, and a take-out pipe section. A branch saddle with a fuse function, comprising: a fuse mechanism for closing a passage in a take-out pipe when a pressure difference between an upstream side and a downstream side becomes a predetermined value or more.