JP2006207656A - Fluid conduit shut-off tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably shut off the flow of fluid by allowing easy insertion of a fluid conduit such as a bent pipe into a prescribed position, even if it has a complicated shape, such as a bent pipe. <P>SOLUTION: In this fluid conduit shut-off tool, a hollow pipe 1 made of a flexible material is inserted into the fluid conduit for shutting off the flow of the fluid in the fluid conduit. In at least one position in the longitudinal direction of the hollow pipe 1, a diameter-enlargement operating part 5 is provided. The fluid conduct shut-off tool is expanded in the radial direction of the hollow pipe and pressed brought into contact with the inner wall of the fluid conduit to increase the inner pressure of the hollow pipe 1 to shut off the flow of the fluid in the fluid conduit. Other portions are formed on a non-diameter-enlargement operating part 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid conduit breaker that inserts a hollow tube made of a flexible material into a fluid conduit to block the flow of fluid in the fluid conduit.

  In existing piping work such as gas pipes and water pipes, when repairing the middle part of the pipe or connecting a new branch pipe to the middle part, gas or tap water etc. on the upstream side of the pipe work part It is necessary to temporarily block the fluid flow.

Therefore, conventionally, a fluid conduit breaker equipped with a bag body made of rubber or elastic synthetic resin is inserted into the pipe, and the bag body is inflated at a predetermined position to block the inside of the pipe (patent) Reference 1).
Japanese Utility Model Publication No. 6-631995

  However, this conventional fluid conduit breaker has a configuration in which both ends of the bag body 10 are caulked with inflexible metal cylinder members 11 as shown in FIG. Therefore, for example, if an attempt is made to insert a conventional fluid conduit breaker into a crank-shaped pipe in which an elbow pipe and a straight pipe are combined, the inflexible metal cylinder member 11 becomes an obstacle, resulting in a pipe bending portion or the like. Therefore, there is a problem in that it is difficult to insert the bag body to a predetermined position and the workability is poor.

  The present invention has been made in view of the above circumstances, and even a fluid conduit having a complicated shape such as a curved pipe can be easily inserted to a predetermined position, and the fluid flow can be reliably performed. Provided is a fluid conduit breaker capable of blocking

  A first characteristic configuration of the present invention is a fluid conduit breaker that inserts a hollow tube made of a flexible material into a fluid conduit to block the flow of fluid in the fluid conduit, and includes an internal pressure in the hollow tube. Is increased in diameter in the longitudinal direction of the hollow tube so as to expand in the radial direction of the hollow tube, press against the inner wall of the fluid conduit, and block the flow of fluid in the fluid conduit. It is provided in at least one place, and the other part is a fluid conduit breaker formed in the non-diameter expanding portion.

[Action and effect]
Since the fluid conduit breaker inserts a hollow tube made of a flexible material into the fluid conduit and blocks the flow of fluid in the fluid conduit, the position where the fluid flow is blocked is directly connected to, for example, the elbow tube. Even when the hollow pipe has to pass through the curved pipe, the pipe is bent because the entire length is flexible. It is possible to easily pass through without being caught in the part and insert it to a predetermined position.

  Further, by increasing the internal pressure in the hollow tube, the diameter-expanding action portion that swells in the radial direction of the hollow tube, presses against the inner wall of the fluid conduit, and can block the flow of the fluid in the fluid conduit is provided. Since the hollow tube is provided in at least one place in the longitudinal direction and the other part is formed in the non-diameter expanding portion, after inserting the hollow tube to a predetermined position of the fluid conduit, for example, using a compressor or the like When air or the like is supplied into the hollow tube and its internal pressure is increased, the diameter expanding action portion expands in the radial direction of the hollow tube and presses against the inner wall of the fluid conduit, so that the fluid in the fluid conduit Can be blocked. In addition, since the said diameter-expansion action part is provided in at least one place and the other part is formed in the non-diameter-expansion action part, for example, all the parts are comprised by the diameter-expansion action part. The supply amount of air or the like for increasing the internal pressure is less than that of the pipe, and the flow of fluid in the fluid conduit can be quickly cut off.

  According to a second characteristic configuration of the present invention, the hollow tube is composed of an inner tube layer and an outer tube layer, and a cylindrical fiber reinforcing layer formed therebetween, and the non-diameter expanding action portion. The fiber reinforcing layer is composed of a longitudinal reinforcing fiber layer along the longitudinal direction of the tube and a transverse reinforcing fiber layer in a direction intersecting with the longitudinal direction of the tube, and the fiber reinforcing layer of the diameter expanding action portion is only the longitudinal reinforcing fiber layer. It is in the point which consists of.

[Action and effect]
Since the hollow tube is composed of an inner tube layer and an outer tube layer and a cylindrical fiber reinforcing layer formed between them, for example, the inner tube layer and the outer tube layer are made of a rubber material. In addition, the fluid conduit breaker of the present invention can be manufactured by a method of manufacturing a normal pressure hose or the like having a configuration in which the fiber reinforcing layer is knitted with an appropriate reinforcing fiber.

  Further, the fiber reinforcement layer of the non-diameter expanding action part is composed of a longitudinal reinforcing fiber layer along the pipe longitudinal direction and a transverse reinforcing fiber layer in a direction intersecting the pipe longitudinal direction, and the fiber reinforcement of the diameter expanding action part. Since the layer is composed only of the longitudinal reinforcing fiber layer, if the internal pressure in the hollow tube is increased, the non-diameter expanding action part does not expand, but the thin diameter expanding action part of the fiber reinforcing layer cannot withstand the internal pressure and expands. Can do. At this time, since only the longitudinal reinforcing fiber layer along the longitudinal direction of the tube is formed in the diameter expansion action portion, the expansion in the longitudinal direction of the hollow tube is suppressed, and the radial expansion preferentially, The flow of fluid in the fluid conduit can be blocked efficiently.

  The 3rd characteristic structure of this invention exists in the point with which the said diameter expansion effect | action part is provided in multiple places in the longitudinal direction of the said hollow tube.

[Action and effect]
Since the diameter expansion action part is provided at a plurality of positions in the longitudinal direction of the hollow tube, when the internal pressure in the hollow tube is increased, the diameter expansion action part is expanded at the same time at a plurality of positions, and the expansion on the upstream side is temporarily assumed. Even if the fluid overflows the diameter acting part, the diameter expanding action part on the downstream side can block the flow of the overflow fluid, so compared with the case where the diameter expanding action part is provided only at one place of the hollow tube Thus, the flow of the fluid in the fluid conduit can be blocked more reliably.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment
FIG. 1 is a longitudinal sectional view of a main part of a pressure hose body 1 (an example of a hollow tube) constituting a fluid conduit breaker of the present invention. The pressure hose body 1 is composed of an inner tube rubber layer 2 and an outer tube rubber layer 3, and a fiber reinforcing layer 4 (longitudinal reinforcing fiber layer 4a and lateral reinforcing fiber layer 4b) formed therebetween.

  FIG. 3 (a) is a partially cutaway cross-sectional view at the tip of the pressure hose body 1. A plug 7 that closes one end of the pressure hose body 1 and a diameter expansion action portion 5 are provided at one end of the pressure hose body 1. The non-diameter expanding portion 6 constitutes a main part of the pressure hose body 1, and the fiber reinforcement layer 4 includes a longitudinal reinforcement fiber layer 4 a in which fibers are arranged along the longitudinal direction of the pressure hose body 1, and It is comprised from the horizontal reinforcement fiber layer 4b by which a fiber is arrange | positioned in the direction which cross | intersects with respect to a longitudinal direction. However, the fiber reinforcement layer 4 in the diameter expansion action part 5 is comprised only from the longitudinal reinforcement fiber layer 4a.

  A known material can be used for the inner tube rubber layer 2, the fiber reinforcement layer 4, and the outer tube rubber layer 3. For example, as a material for the inner tube rubber layer 2 and the outer tube rubber layer 3, natural rubber and various synthetic rubbers can be used alone or in any mixture. Specifically, natural rubber, styrene rubber, butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, silicon rubber, urethane rubber, or a copolymer synthesized by arbitrarily combining these may be used.

  Examples of the material for the fiber reinforcing layer 4 include aramid fibers, polyester, nylon, rayon, vinylon, aramid fiber yarns, and those formed by blended yarns thereof.

  As a manufacturing method of the pressure hose body 1, a known method can be adopted. As a preferred method, unvulcanized rubber, so-called raw rubber, is put into an extrusion molding apparatus to extrude the inner tube rubber layer 2. Subsequently, the reinforcing fiber is knitted on the outer peripheral surface of the inner tube rubber layer 2 with a bobbin or the like. At this time, the longitudinal reinforcing fiber layer 4a is first formed, and then the fibers are wound spirally thereon to form the lateral reinforcing fiber layer 4b. In addition, the lateral reinforcing fiber layer 4b is not formed in the portion constituting the diameter expansion action portion 5. Then, the outer tube rubber layer 3 is extruded so as to cover the knitted fiber reinforcement layer 4, and an unvulcanized raw rubber hose is molded. Finally, this raw rubber hose is heated and vulcanized to form a pressure hose.

  One end of the pressure hose body 1 thus obtained is plugged and closed. As the stopper 7, a rubber material similar to that of the pressure hose body 1 may be bonded and fixed with an adhesive or the like, or it can withstand the internal pressure of the pressure hose body 1 and reliably close one end. If it is a structure, the material used for the stopper 7 and the fixing method are arbitrary. For convenience, one end of the pressure-resistant hose body 1 that is plugged is referred to as the front end side, and the one that is not plugged is referred to as the rear end side.

  FIG. 3B shows a state in which a fluid (for example, air) is supplied from the rear end side of the pressure hose body 1 using a compressor or the like (not shown), and the internal pressure is increased. . As shown in FIG. 3B, when the internal pressure of the pressure-resistant hose body 1 is increased, the non-diameter expanding portion 6 does not expand, but the thin diameter expanding portion 5 of the fiber reinforcement layer cannot withstand the internal pressure and can expand. At this time, since only the longitudinal reinforcing fiber layer 4a is formed in the diameter expansion action part 5, the expansion of the pressure-resistant hose body 1 in the longitudinal direction is suppressed, and the expansion is preferentially expanded in the radial direction. Examples of the fluid that can be used to increase the internal pressure of the pressure-resistant hose body 1 include air and water. However, the fluid is not limited to these, and other gases (for example, various inert gases) may be used as necessary. Etc.) and liquid (oil etc.) can be used.

In FIG. 2, the pressure hose body 1 is inserted into the crank-shaped fluid conduit 8 and the tip side is fed to a predetermined position T (FIG. 2 (A)), and then a fluid such as air is supplied from the rear end side. The state (FIG. 2 (B)) is shown in which the internal pressure is increased to expand the diameter expanding action portion 5 to block the fluid conduit 8. Since the pressure hose body 1 has no change in outer diameter and is flexible before increasing its internal pressure, it can be inserted and passed through a fluid conduit including a curved pipe without being easily caught. it can. In addition, since the fiber reinforcing layer of the pressure hose body 1 has at least the longitudinal reinforcing fiber layer 4a over the entire longitudinal direction, the stiffness of the pressure hose body 1 can be guaranteed to some extent over the entire length direction. Therefore, even when the pressure-resistant hose body 1 is inserted into the fluid conduit including the bent tube, the problem that the stiffness of the pressure resistant hose body 1 is broken in the middle of the fluid conduit and it becomes difficult to insert into the fluid conduit can be prevented.
The fluid conduit to which the present invention is applied includes various pipes such as a gas pipe and a water pipe, but is not limited to these.

[Another embodiment]
FIG. 4 is a partially cutaway cross-sectional view of the tip portion of the pressure hose body 1 showing another embodiment of the present invention, and FIG. 4 (a) shows a state before the internal pressure of the pressure hose body 1 is increased. FIG. 4B shows a state when the internal pressure of the pressure hose body 1 is increased.
As shown in FIG. 4A, the tip end portion of the pressure-resistant hose body 1 is provided with a plug 7 that closes one end portion of the pressure-resistant hose body 1 and a diameter expansion action portion 5. And the fiber reinforcement layer 4 is not formed on the outer peripheral surface of the inner pipe rubber layer 2 of the diameter expansion action part 5, but the vertical reinforcement is carried out to the other outer peripheral part (non-diameter expansion action part 6) of the inner pipe rubber layer 2. The fiber layer 4a and the lateral reinforcing fiber layer 4b are formed. Further, a wire member 9 (for example, a piano wire) is stretched along the axis of the pressure hose body 1, one end of which is fixed to the stopper 7, and the other end is on the rear end side. It is fixed (not shown).

  As shown in FIG. 4B, when the internal pressure of the pressure-resistant hose body 1 is increased, the diameter expansion action portion 5 expands. At this time, the diameter expansion action part 5 can expand in both the longitudinal direction and the radial direction of the pressure-resistant hose body 1, but the tension in the wire member 9 can suppress the expansion in the longitudinal direction. For this reason, unlike the above-mentioned embodiment, since the longitudinal reinforcement fiber layer 4a is not formed in the diameter expansion action part 5, it can expand | swell more radially and can interrupt | block a fluid conduit more quickly and reliably. Is possible. In addition, the strength of the stiffness in the diameter expansion action part 5 can be guaranteed to some extent by the tension of the wire member 9. Therefore, even when the pressure-resistant hose body 1 is inserted into the fluid conduit including the bent tube, the problem that the stiffness of the pressure resistant hose body 1 is broken in the middle of the fluid conduit and it becomes difficult to insert into the fluid conduit can be prevented.

[Other Embodiments]
1. The flexible material is not limited to the rubber material used in the embodiment, and has flexibility that allows insertion and passage in a fluid conduit including a curved pipe, and expands. Any material can be used as long as it can close the fluid conduit. For example, a flexible synthetic resin material such as flexible polyurethane or polyethylene can be used instead of the rubber material.
2. Although the diameter expansion action part shown to embodiment and another embodiment is set as the structure provided only in the front-end | tip side of a pressure | voltage resistant hose main body, it is not limited to this, About the position and number to provide, it is arbitrary as needed. Can be set to
3. If necessary, the pressure hose body of the present invention may be provided with a sensor for measuring the internal pressure of the fluid conduit, a small camera for inspecting the inside of the fluid conduit, and the like.

Longitudinal sectional view of a pressure hose body constituting the fluid conduit breaker of the present invention The figure which shows a mode that the pressure | voltage resistant hose main body of this invention is inserted in a crank-shaped fluid conduit | pipe, a diameter expansion action part is expanded, and a fluid conduit | pipe is interrupted | blocked. Partial cutaway cross-sectional view at the tip of the pressure hose body of the present invention Partial cutaway cross-sectional view of the pressure hose main body tip showing another embodiment of the present invention Figure showing a conventional fluid conduit breaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure-resistant hose main body 2 Inner tube rubber layer 3 Outer tube rubber layer 4 Fiber reinforcement layer 4a Vertical reinforcement fiber layer 4b Horizontal reinforcement fiber layer 5 Diameter expansion action part 6 Non-diameter expansion action part 7 Plug 8 Fluid conduit 9 Wire member 10 Bag body 11 Metal cylinder member T Predetermined position

Claims (3)

A fluid conduit breaker that inserts a hollow tube of flexible material into a fluid conduit to block the flow of fluid in the fluid conduit;
By increasing the internal pressure in the hollow tube, the hollow tube has a diameter-expanding action portion that swells in the radial direction of the hollow tube, presses against the inner wall of the fluid conduit, and blocks the flow of fluid in the fluid conduit. A fluid conduit breaker provided at at least one place in the longitudinal direction of the pipe and the other part being formed in the non-diameter expanding portion.   The hollow tube is composed of an inner tube layer and an outer tube layer, and a cylindrical fiber reinforcing layer formed between them, and the fiber reinforcing layer of the non-diameter expanding portion is a tube length 2. The fluid according to claim 1, comprising a longitudinal reinforcing fiber layer along a direction and a transverse reinforcing fiber layer in a direction intersecting with a longitudinal direction of the pipe, and the fiber reinforcing layer of the diameter expanding action portion includes only the longitudinal reinforcing fiber layer. Conduit breaker.   The fluid conduit breaker according to any one of claims 1 to 2, wherein a plurality of the diameter expanding action portions are provided in a longitudinal direction of the hollow tube.

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