JP2001059594A - Branch saddle with fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance responsiveness to pressure difference and flowing power of a fluid when excessive outflow is brought in a secondary side piping, to secure sure blocking at the abnormal time, to facilitate piping excecution when a branch pipe is branched from a main piping to conduct piping, to compactify a size, and to secure safety. SOLUTION: This saddle is a branch saddle for branching a branch pipe 18 from main piping 1 to conduct piping by drilling the piping 1 using a tapping cutter 20 connected to a surface of the main pipe 1 and equipped inside a drill pipe part 11, and the tapping cutter 20 is moved to close a valve port 32 provided inside the pipe part 11 when a pressure difference between an upstreamand and a downstream comes to a prescribed value or more. The saddle is composed of a saddle part 15 fused onto a surface of the resin pipe 1, the drill pipe part 11 upright in the saddle part 15, the tapping cutter 20 equipped to the pipe part 11, a valve element 22 is provided in the tapping cutter to be fitted loosely, and the valve element 22 closes a passage inside the pipe 11 when the pressure difference between the upstream and the downstream comes to the prescribed value 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 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. 4 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 react 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. The present invention solves the above-mentioned problems and has good responsiveness due to the pressure difference and fluid flow when the secondary pipe is over-drained. Provided is a branch saddle with a fuse, which is easy to perform piping work and secures safety in a compact manner.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a branch saddle for piercing a pipe with a tapping cutter connected to the surface of the original pipe and mounted in a perforated pipe section, extracting a branch pipe from the pipe, and piping. The tapping cutter moves to close a valve port provided in a perforated pipe section when a pressure difference between the downstream side and the downstream side becomes a predetermined value or more. Further, the present invention comprises a saddle portion fused to the surface of the resin tube, a perforated pipe portion standing upright on the saddle portion, and a tapping cutter attached to the perforated tube portion. The valve body closes the passage in the perforated pipe when the valve is loosely fitted and the pressure difference between the upstream side and the downstream side becomes a predetermined value or more.

[0005] In the above, the tapping cutter comprises a feed screw portion screwed into a female screw provided in the perforated tube portion, a forsaw portion perforated on the surface of the tube, and a valve body seated on a valve seat provided in the perforated tube portion. It is characterized by. In the above, the tapping cutter is a branch saddle with a fuse in which the forsaw portion and the valve body are connected by a shaft, the feed screw portion and the shaft are connected by a plurality of ribs, and a fluid passes between the ribs. . In the above, the perforated pipe portion has a female screw into which the feed screw of the tapping cutter is screwed, an inner peripheral portion of the cylinder into which the tapping cutter is loosely fitted, and a valve seat member through which fluid passes and the valve element of the tapping cutter opens and closes.

In the above, a spring is mounted between the tapping cutter and the valve seat member, and when the pressure difference between the upstream side and the downstream side becomes greater than a predetermined value, the valve body of the tapping cutter is opposed to the spring. The seat is closed. In the above, a small hole communicating from the upstream side to the downstream side is formed in the valve body or the valve seat member of the tapping cutter, so that the fluid flows from the upstream side to the downstream side little by little even when the valve body closes the valve port. It has become. In the above description, the branch saddle body is made of synthetic resin or metal.

[0007]

The present invention has the above-mentioned structure, and when a branch pipe is taken out of the original pipe and piped, the tapping cutter is connected to the original pipe surface and drilled on the pipe surface with a tapping cutter. When the pressure difference between the upstream side and the downstream side becomes greater than a predetermined value, the tapping cutter moves to close the valve port provided in the perforated pipe section. Therefore, if there is something wrong with the downstream pipe on the branch pipe side and a large amount of gas is ejected,
Tapping cutter automatically closes the valve port in the perforated pipe,
Prevent major accidents. Further, according to the present invention, the tapping cutter is loosely fitted in the perforated pipe portion after being connected to the original pipe surface and connected to the pipe surface, and the valve element provided in the tapping cutter has a predetermined pressure difference between the upstream side and the downstream side. Since the valve element closes the passage in the perforated pipe portion when the above becomes the case, when an abnormal situation such as generation of a large amount of gas in the downstream pipe occurs, the tapping cutter is automatically turned on. The valve body closes the valve opening to prevent a major accident.

[0008] A feed screw portion of the tapping cutter is screwed into a female screw provided in the perforated pipe portion and perforates the original pipe surface with a forsaw portion. Further, the forsaw portion and the valve body are connected by a shaft, and the shaft and the feed screw portion are connected by a plurality of ribs to be integrated. Further, since the fluid flows between the ribs, the fluid in the pipe after the perforation passes through the tapping cutter and is supplied to the downstream side on the branch pipe side. Further, when an abnormal situation such as a large amount of gas spouting from the valve body connected to the shaft to the downstream pipe occurs, the valve seat member is closed to shut off the fluid, thereby preventing a major accident. The saddle drilling pipe has a female screw into which the tapping cutter is screwed, a cylindrical inner periphery into which the tapping cutter is loosely fitted, and a valve seat member through which fluid passes and the tapping cutter valve opens and closes. When tapping, the tapping cutter is returned to the inner periphery of the cylinder where the tapping cutter is loosely fitted and is loosely fitted in the bored pipe, and gas is ejected to the downstream pipe. When an abnormality such as the occurrence of an abnormality occurs, the valve body of the tapping cutter sits on the valve seat member to shut off the fluid.

A spring is mounted between the tapping cutter and the valve seat member, and when the pressure difference between the upstream side and the downstream side exceeds a predetermined value, the valve body is seated on the valve seat member against the spring. Therefore, it works effectively as a shutoff valve mechanism.
Also, if a small hole is made in the tapping cutter valve body or valve seat member to flow from the upstream side to the downstream side, even if the valve body closes the valve seat member, the upstream branch is gradually branched from the downstream side to the downstream side. When the fluid flows to the pipe and the repair of the gas ejection point etc. of the downstream pipe is completed, it flows to the downstream pipe, so the downstream pressure gradually increases, and the upstream side of the valve body seated on the valve seat member Since the pressure difference between the downstream sides disappears, 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.

[0010]

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 showing an embodiment of the present invention. A saddle main body 10 is connected to the surface of a main pipe 1 and a hexagon wrench is inserted from the upper end of a perforated pipe section 11 to form a tapping cutter 20. , The hole 2 is drilled in the original pipe 1 and then pulled up while holding the section 2 after drilling in the forsaw 21 of the tapping cutter. To a state in which the tapping cutter 20 is loosely slidably fitted within the cylindrical inner peripheral surface 14, and the upper end is a cap 16.
And hermetically closed.

The branch saddle body 10 of this embodiment is made of polyethylene resin, and has a saddle-shaped saddle portion 15, a perforated pipe portion 11 standing upright on the saddle portion, and a branch pipe portion 1 branched from the perforated pipe portion.
8 and a cap 16 for closing the upper end of the perforated tube 11. A tapping cutter 20, a valve seat member 30, and a coil spring 35 are mounted in the perforated tube portion 11. A heating wire is embedded on the inner peripheral side of the saddle portion 15 so that it can be easily fused to the surface of the resin-made original pipe 1. When the saddle main body 10 is made of metal, it is connected to the original pipe 1 by an existing clamp member, band, or the like. The tapping cutter 20 is made of metal, provided with a forsaw 21 for piercing the original pipe 1 at the lower end of the center, and a valve body 22 at the upper end of the center,
The forsaw 21 and the valve body 22 are connected by a shaft 23.
A packing is attached to the valve body 22 in consideration of sealing properties.

As shown in FIG. 2, a plurality of ribs 24 are provided on the shaft 23, and an external male screw 29 is provided integrally therewith. A fluid flow passage 26 is provided between the ribs 24. A hexagonal hole 25 is provided in the center of the valve body 22. A hexagonal wrench is inserted from the upper end of the perforated tube 11 to rotate the forsaw 21, and the male screw 29 is screwed into the female screw 13 of the perforated tube to advance and retreat. It is an operation unit that pierces the pipe 1 and pulls back after piercing. The valve seat member 30 has a male screw 31 on the outer circumference and a valve port 3 on the inner circumference.
2 and the valve port 32 forms a valve seat 33 on which the valve body 22 of the tapping cutter is seated. An elastic sheet may be attached to the valve seat 33 so as to improve the sealing property with the valve body. A coil spring 35 is mounted between the valve seat member 30 and the tapping cutter 20. During normal use, the coil spring 35 is urged in a direction separating the valve seat 33 and the valve body 22,
The fluid after drilling in the main pipe 1 flows into the flow passage 26 between the ribs.
Through the valve body 22 and the valve seat 33, and through the valve port 32 to the branch pipe portion 18.

FIG. 3 shows a state in which some abnormality has occurred in the downstream secondary pipe after the branch pipe section 18 and the valve body 22 is seated on the valve seat 33. For example, when a shovel during road construction hooks the secondary pipe to create a hole 19 in the pipe 18, a large amount of gas is ejected from the secondary pipe 18. In addition, a large amount of gas may be ejected abnormally due to some abnormality in the piping in the house where the customer lives. In such a case,
The secondary pressure on the downstream side is lower than the primary pressure on the upstream side of the valve body, and also overlaps with the flow force of the gas jet flowing to the downstream side, so that the pressure inside the cylindrical inner peripheral surface 14 of the perforated pipe portion 11 is reduced. The tapping cutter 20, which is loosely fitted, slides and is drawn to the downstream side,
The valve body 22 of the tapping cutter is connected to the valve seat 3 of the valve seat member 30.
3 and closes the valve port 32. In particular, in the present invention, the valve mechanism is provided in the perforated pipe section 11 of the branch saddle, so that even when the branch pipe section 18 is hooked by a shovel, the valve mechanism in the perforated pipe section 18 is not broken, and the reliability of the valve mechanism is reduced. The nature is planned.

A small hole 27 is formed in the valve body 22 so that the gas gradually flows to the downstream pipe even when the valve body 22 closes the valve port 32. For example, when the abnormal state of the secondary pipe is restored and the leakage of the secondary pipe stops, gas flows little by little from the small hole 27 provided in the valve body 22, and the pressure of the secondary pipe gradually increases, and Equilibrate with the pressure of the downstream piping. When the pressure difference between the upstream side and the downstream side disappears, the valve 2
2 is the valve seat 3 in combination with the repulsive force of the coil spring 35.
3 and return to normal distribution. The small hole 27 may be provided to penetrate the valve seat member 30 so that fluid always flows through the valve seat member.

[0015]

As described above, the branch saddle with a fuse according to the present invention has a simple structure, can cope with an emergency in the event of an abnormality in the secondary piping, and ensures safety. In addition, since it is a mechanism that the valve body and the horsaw are integrated,
The fuse function is added only by drilling work like a conventional branch saddle, and there is no need to provide a special fuse valve device in the middle of piping. Further, since there is no valve mechanism in the secondary pipe of the branch pipe portion, a bending force such as land subsidence or hooking with a shovel acts to prevent damage to the valve mechanism, thereby securing long-term reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of the present invention and showing a normal use state after drilling a main pipe.

FIG. 2 is a view showing an AA cross section of the tapping cutter in FIG. 1;

FIG. 3 is a cross-sectional view showing the embodiment of the present invention and showing a state where a valve body closes a valve seat when an abnormality occurs.

FIG. 4 is a sectional view showing a conventional technique.

[Explanation of symbols]

1 source piping 2 section 10 branch saddle main body 11 perforated pipe section 13 internal thread 14 cylindrical inner peripheral surface 15 saddle section 16 cap 18 branch pipe section 20 tapping cutter 21 forsaw 22 valve element 23 shaft 24 rib 25 hexagonal hole 26 flow passage 27 small hole 29 Male feed screw 30 Valve seat member 31 Male screw 32 Valve port 33 Valve seat 35 Coil spring

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ken Kato 2 Daifuku, Kuwana-shi, Mie Hitachi Metals, Ltd. Kuwana Plant (72) Inventor Hiroshi Oya 2nd Daifuku, Kuwana-shi, Mie Hitachi Metals, Kuwana Plant F Terms (reference) 3H019 BA04 BB02 BB08 CB01 DA03 GA03

Claims (7)

[Claims] 1. A branch saddle for piercing a pipe with a tapping cutter connected to the surface of a source pipe and mounted in a perforated pipe section, and for taking out a branch pipe from the pipe, wherein a pressure difference between an upstream side and a downstream side is more than a predetermined value. Wherein the tapping cutter moves to close a valve port provided in a perforated pipe section when the pressure becomes zero. And a tapping cutter mounted on the perforated pipe portion, the perforated pipe portion standing upright on the saddle portion, and a tapping cutter mounted on the perforated pipe portion. A branch saddle with a fuse, wherein the valve body closes a passage in a perforated pipe when the valve body is loosely fitted and a pressure difference between an upstream side and a downstream side becomes a predetermined value or more. 3. The tapping cutter comprises a feed screw portion screwed into a female screw provided in a perforated tube portion, a forsaw portion perforated on the surface of the tube, and a valve body seated on a valve seat provided in the perforated tube portion. The branch saddle with a fuse according to claim 1 or 2, wherein 4. The tapping cutter according to claim 1, wherein the forsaw portion and the valve body are connected by a shaft, the feed screw portion and the shaft are connected by a plurality of ribs, and a fluid passes between the ribs. The branch saddle with a fuse according to claim 1, wherein: 5. The drilling pipe portion has a female screw into which a feed screw of a tapping cutter is screwed, a cylindrical inner peripheral portion into which the tapping cutter is loosely fitted, a valve seat member through which fluid passes and a valve body of the tapping cutter opens and closes. The branch saddle with a fuse according to claim 1, further comprising: 6. A spring is mounted between the tapping cutter and the valve seat member, and when the pressure difference between the upstream side and the downstream side becomes greater than a predetermined value, the valve body of the tapping cutter is opposed to the spring. The branch saddle with a fuse according to any one of claims 1 to 5, wherein the saddle is closed. 7. The tapping cutter according to claim 1, wherein a small hole is formed in a valve body of the tapping cutter so that fluid flows from the upstream side to the downstream side little by little even when the valve body closes the valve port. Item 7. A branch saddle with a fuse according to items 1 to 6.