JP2022010383A - Closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closing device which enables reduction of a pull force acting on a hose connected to a bag.

SOLUTION: A closing device 2 includes: a hose 21 in which a fluid can be sent from one end; and a bag 22 which is connected to the other end of the hose 21 and may be expanded by a pressure of the fluid. In the closing device 2, an introduction device 5 introduces the bag 22 from the side of a branch part 3a branched from a fluid pipe 1 into the fluid pipe 1 in a state in which the flow is not interrupted, and the bag 22 is expanded to close an interior of the fluid pipe 1. The hose 21 is configured to be detachably attached to a connection member 24 for connecting the hose 21 and the bag 22 and a tip part 23 of the introduction device 5.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a closing device that is introduced into the inside of the fluid pipe in a continuous flow state from the branch portion side that branches from the fluid pipe and temporarily shuts off the fluid inside the fluid pipe.

The conventional closing device is used, for example, when relocating a fluid pipe such as a water pipe or a gas pipe, and a bag connected to one end of a rubber hose is branched from the fluid pipe using an introduction device in a contracted state. After introducing the fluid from the branch side into the inside of the fluid pipe in a continuous flow state, a fluid such as water or air is sent from the other end side of the hose to inflate the bag, thereby blocking the flow path inside the fluid pipe and fluid. There is something that temporarily blocks.

In the water stop device bag (closing device) disclosed in Patent Document 1, one end of the hose is connected to the attachment port of the bag main body, and the bag main body side is connected to the mouthpiece attached to the other end of the hose. By providing a hose anti-folding pipe that expands toward the hose, even if the bag main body inflated inside the fluid pipe is swept downstream of the fluid pipe by the pressure of the fluid flowing through the fluid pipe, the hose anti-folding pipe is provided. The hose bends gently along the inclination in the pipe, and it is possible to prevent the hose from being damaged or cut due to the sudden bending.

Jikkenhei 6-12896 (P. 5, Fig. 2)

However, in Patent Document 1, the hose is pulled to the downstream side by the pressure of the fluid flowing through the fluid tube causing the bag main body inflated inside the fluid tube to be swept downstream of the fluid tube, resulting in excessive tension. There is a problem that the hose may be damaged due to the action of the force.

The present invention has been made focusing on such a problem, and an object of the present invention is to provide a closing device capable of reducing a tensile force acting on a hose connected to a bag.

In order to solve the above problems, the blocking device of the present invention is used.
A hose capable of feeding fluid from one end and a bag connected to the other end side of the hose and inflatable by the pressure of the fluid are provided, and the bag is branched from the fluid pipe by an introduction device. A closing device that is introduced into the inside of a fluid pipe in a continuous flow state and inflates the bag to close the inside of the fluid pipe.
It is characterized by including a protective member for connecting a connecting member for connecting the hose and the bag to the tip end portion of the introduction device.
According to this feature, the connecting member connecting the hose and the bag and the tip of the introduction device for introducing the bag from the branch portion into the inside of the fluid pipe are connected by the protective member, so that the fluid expands inside the fluid pipe. The pulling force acting on the hose can be received by the protective member when the made bag is swept downstream of the fluid pipe by the flow or pressure of the fluid in the fluid pipe, so that the tensile force acting on the hose connected to the bag can be received. Can be reduced.

The protective member is characterized by including a plate-shaped member pivotally supported at the connection member and the tip of the introduction device, respectively.
According to this feature, since the connecting member and the tip of the introduction device are connected by the plate-shaped member, the relative distance between the connecting member and the tip of the introduction device is substantially constant, and the plate-shaped member is formed. Is pivotally supported at the tip of the connecting member and the introduction device, so that the plate-shaped member can be rotated with respect to the connection member and the tip of the introduction device to bend the closing device. Only the stress in the bending direction can be applied without applying the tensile force.

The plate-shaped member is characterized in that at least two of the plate-shaped members are provided so as to face each other with the hose interposed therebetween.
According to this feature, at least two opposing plate-shaped members can protect both sides of the hose in the bending direction, so that the hose can be prevented from being damaged.

The plate-shaped members are provided in pairs with the hose interposed therebetween, and are characterized in that they are wider than the hose.
According to this feature, since the plate-shaped members are provided in pairs with the hose sandwiched between them and are wider than the hose, it is possible to secure a space formed between the pair of plate-shaped members in a bent state of the closing device. Moreover, since the wide plate-shaped member can prevent the hose from sticking out, the plate-shaped member can easily protect the hose.

The connecting member is characterized by including a regulating portion that regulates the rotation of the plate-shaped member.
According to this feature, since the connecting member connecting the hose and the bag is provided with a regulating portion for restricting the rotation of the plate-shaped member, when the bag is introduced into the fluid pipe from the branch portion side by the introducing device. Can provide a closing device that bends a fluid tube in only one direction.

The bag is characterized in that it is removable from the connecting member.
According to this feature, the closing device can be used repeatedly by replacing the bag that can be attached to and detached from the connecting member.

It is characterized by being provided between the connection member and the tip end portion of the introduction device and provided with a deformable cover member.
According to this feature, the cover member can protect the hose in the circumferential direction without the cover member interfering with the bending of the closing device.

It is a front sectional view which shows the fluid tube which attached the occlusion device in an Example. It is a side sectional view which shows the fluid tube to which the closing device is attached. It is a front view which shows the situation which a bag is connected to a closing device. (A) is a front view showing the structure of the closing device, (b) is also a side view, and (c) is also a side sectional view. It is a perspective view which shows the state which the occlusion device was bent. It is a side sectional view which shows the process of introducing the bag of a closing device into the inside of a fluid pipe from a branch part side. FIG. 6 is a side sectional view showing a process of further introducing a bag of a closing device from FIG. FIG. 7 is a side sectional view showing a process of further introducing a bag of a closing device from FIG. 7. FIG. 8 is a side sectional view showing a process of further introducing a bag of a closing device from FIG. It is a side sectional view which shows the situation which the bag of a closing device is inflated, and the inside of a fluid tube is closed. (A) is a front view of a partial cross section showing a cover member attached to the closing device, and (b) is a side view of a partial cross section. (A) is a front view showing a modified example 1 of the closing device, and (b) is also a side view. (A) is a front view of a partial cross section showing a modification 2 of the closing device, and (b) is a side view of a partial cross section. (A) is a front view of a partial cross section showing a modified example 3 of the closing device, and (b) is a side view of a partial cross section.

An embodiment for carrying out the blocking device according to the present invention will be described below based on examples. For convenience of explanation, the left side of the paper in FIG. 2 is the upstream side of the fluid pipe, and the right side is the downstream side.

The blocking device according to the embodiment will be described with reference to FIGS. 1 to 10. First, the configuration of the fluid pipe, the introduction device and the block device, and the details of each part structure will be described with reference to FIGS. 1 to 5, and then the fluid using the block device with reference to FIGS. 2 and 6 to 10. The process of closing the pipe will be described.

The existing fluid pipe 1 used as a water supply (hereinafter, simply referred to as “fluid pipe 1”) is buried in the ground, and a plurality of branch pipes (not shown) are connected to the fluid pipe 1 and these branch pipes are connected to each other. Is installed in each home / facility.

As shown in FIG. 1, the fluid tube 1 is made of ductile cast iron, is formed in a substantially circular shape in cross section, and its inner peripheral surface is covered with an epoxy resin layer. The fluid pipe according to the present invention may be made of other metal such as cast iron or steel, or may be made of concrete, vinyl chloride, polyethylene, polyolefin or the like. Furthermore, the inner peripheral surface of the fluid tube is not limited to the epoxy resin layer, and may be coated with, for example, mortar, or an appropriate material may be coated on the inner peripheral surface of the fluid tube by powder coating. Further, the materials of the housing 3, the short pipe 4, the introduction pipe 51 and the like, which will be described later, may also be suitable for the above.

The closing device 2 of the present invention branches from the fluid pipe 1 in consideration of the convenience of the supply area when the predetermined section of the fluid pipe 1 is temporarily or permanently removed due to a defect such as deterioration over time. It is introduced into the fluid pipe 1 from the branch portion 3a side in a continuous flow state, and is used to temporarily shut off the fluid in the fluid pipe 1. In this embodiment, the fluid in the fluid pipe is clean water, but it is not limited to the clean water of this embodiment, for example, industrial water, agricultural water, sewage, gas or a gas-liquid mixture of gas and liquid. It doesn't matter.

First, the configuration of the fluid pipe 1 and the structure of each part will be described. As shown in FIGS. 1 and 2, a housing 3 constituting the branch portion 3a is attached to the fluid pipe 1. More specifically, in this embodiment, the housing 3 has a structure in which the fluid pipe 1 is divided into two in the radial direction, the first divided housing 31 and the second divided housing 32. By connecting the 32 to each other, openings 3b and 3b along the outer periphery of the fluid tube 1 are formed, and the openings 3b and 3b are configured to be hermetically fitted to the fluid tube 1.

Further, the first split housing 31 is extended with a branch portion 3a extending upward in a direction substantially perpendicular to the fluid pipe 1, and the branch portion 3a is an on-off valve device 30 capable of opening and closing the branch portion 3a. The short tube 4 is attached via the above. Further, at the tip of the short pipe 4, an introduction pipe 51 of an introduction device 5 for introducing the bag 22 of the closing device 2 described later, which closes the inside of the fluid pipe 1, into the inside of the fluid pipe 1 in an uninterrupted state is attached. There is.

Further, a perforated portion 1a perforated by a perforating device (not shown) is formed at the top of the fluid pipe 1 to which the housing 3 is attached, and an introduction device described later from the branching portion 3a side via the perforating portion 1a. The guide member 53 and the closing device 2 of 5 can be introduced inside the fluid pipe 1.

In this embodiment, the first divided housing 31 constituting the upper part of the housing 3 and the second divided housing 32 constituting the lower part will be referred to, but the divided direction of the housing is not limited to the vertical direction, for example. It may be in the horizontal direction or in the inclined direction of a predetermined angle. Further, the number of divisions may be 3 or more. Similarly, the piping direction of the fluid pipe 1 is not limited to horizontal, and may be, for example, vertical.

Next, the configuration of the introduction device 5 and the structure of each part will be described. As shown in FIGS. 1 and 2, the introduction device 5 has an introduction pipe 51 which is attached to the short pipe 4 in communication with the above-mentioned short pipe 4, and is inserted into the introduction pipe 51 in a sealed manner from the branch portion 3a side. It is mainly composed of a shaft member 52 that can move forward and backward toward the inside of the fluid pipe 1 and a guide member 53 that is slidably fitted in the introduction pipe 51 in the axial direction with respect to the shaft member 52. ing. The introduction pipe 51 is attached to the branch portion 3a of the housing 3 via the short pipe 4 and the on-off valve device 30, and is inside the fluid pipe 1 via the perforated portion 1a in the open state of the on-off valve device 30. Communicate with.

More specifically, the introduction pipe 51 is provided with annular sealing materials 51b and 51b made of elastic bodies along the inner circumference of the insertion port 51a formed on the upper end side, so that the shaft member 52 can be inserted into the insertion port. It is inserted in a sealed shape with respect to 51a and is slidable in the axial direction.

As shown in FIGS. 1 to 3, the shaft member 52 is a cylindrical body made of a cylindrical metal material inserted into the introduction pipe 51 via the insertion port 51a of the introduction pipe 51 (FIG. 4 (c)). Refer to), and the flow rate adjusting valve 11 is detachable from the upper end portion 52a of the shaft member 52 via the joint 10. Further, a flow path through which air supplied / discharged via the flow rate adjusting valve 11 can pass is formed in the shaft member 52. Further, a first connecting member 23 (a tip portion of an introduction device), which will be described later, is attached to a lower end portion 52b (see FIG. 4C) of the shaft member 52. In this embodiment, the fluid supplied / discharged to the flow path formed in the shaft member 52 is air, but the fluid is not limited to the air in this embodiment, but a gas other than air, clean water, or the like. It may be a fluid such as a liquid.

Further, the shaft member 52 is provided with three arms 52c, 52c', 52c extending in the radial direction from the outer peripheral surface of the upper end portion 52a, and for example, the arms 52c, 52c extending opposite to each other are gripped and manually operated. By doing so, it is possible to move forward and backward in the axial direction and rotate around the axis in the introduction pipe 51. In this embodiment, the moving means of the shaft member 52 is a manual operation using the arms 52c and 52c. For example, a hoist is erected on the arms 52c and 52c to move the shaft member 52 forward and backward, and the arm 52c and the like. The shaft member 52 may be moved back and forth by using a hydraulic drive device or the like without using the 52c.

Further, the arms 52c, 52c'and 52c are arranged at the upper end portion 52a of the shaft member 52 at approximately 90 degree intervals in the circumferential direction, respectively, and the arms 52c'are provided at positions between the arms 52c and 52c described above. Is extended in the same direction as the bending direction of the closing device 2, which will be described later, and can be aligned in the circumferential direction of the shaft member 52 with reference to the arm 52c'.

As shown in FIGS. 1 and 2, the guide member 53 is a tubular body made of a metal material externally fitted to the shaft member 52, and a wall portion 53a is partially cut out at the lower end portion of the guide member 53. An opening 53b is formed to be opened. The opening 53b is configured such that the extension of the opening in the axial direction is substantially the same as the diameter of the fluid pipe 1 (see FIG. 6). The guide member 53 is not limited to the one made of a metal material, and may be made of a resin material or the like.

Circular through holes 53c and 53c are formed in the wall portion 53a at positions facing the opening 53b. Further, a plurality of elongated through holes 53d are formed in the wall portion 53a at positions above the opening 53b in the circumferential direction. Since these through holes 53d serve as a flow path for flowing the fluid existing in the introduction pipe 51 into and out of the guide member 53, it is easy to move the bag 22 of the closing device 2 described later in the guide member 53. It has become. Further, the through holes 53c and 53d are bypasses (not shown) in the mounting portion 30b communicating with the inside of the valve housing instead of the plug 30a of the on-off valve device 30 in the closed state of the fluid pipe 1 by the closing device 2 described later. When the pipe is arranged, it is configured as a part of the bypass flow path.

Further, a cap 54 having a flange portion formed at the upper end thereof is inserted into the upper end portion of the guide member 53, and is tightened to the wall portion 53a of the guide member 53 by a plurality of bolts 12. The cap 54 is formed with an insertion port 54b penetrating in the axial direction, and annular sealing materials 54c and 54c made of an elastic body are provided on the inner circumference of the insertion port 54b. It is hermetically inserted into the guide member 53 via the guide member 53, and is slidable in the axial direction with respect to the insertion port 54b. It is aligned in the opening direction of.

The shaft member 52 is not limited to the one made of a metal material, but may be made of a resin material or the like, but has higher rigidity than the above-mentioned annular sealing materials 51b and 54c and has a higher coefficient of friction than these annular sealing materials. It is preferably a low material.

Next, the configuration and the structure of each part of the closing device 2 according to the present invention will be described. As shown in FIG. 3, the closing device 2 includes a rubber hose 21 capable of feeding fluid from one end side, a bag 22 expanded by the fluid fed through the hose 21, and the shaft member described above. The first connecting member 23 attached to the lower end portion 52b of 52, the second connecting member 24 (connecting member) connecting the hose 21 and the bag 22, and the first connecting member 23 and the second connecting member 24 can be moved relative to each other. It is mainly composed of a protective member 25 to be connected.

One end side (the left side of the paper surface of FIG. 4 (c)) of the hose 21 is connected to the first joint 26 provided in the first connection member 23, and the other end side (the right side of the paper surface of FIG. 4 (c)) is the second connection. It is connected to a second joint 27 provided in the member 24. Further, the hose 21 is connected by the first joint 26 and the second joint 27 at the axial center positions of the first connecting member 23 and the second connecting member 24 (see FIGS. 4A to 4C). ..

The first joint 26 and the second joint 27 are provided with so-called bamboo shoot-shaped connection portions 26a and 27a in which a plurality of return structures for preventing disconnection are provided on one end side to which the hose 21 is connected, and the connection portions 26a and 27a are provided with the connection portions 26a and 27a. By inserting both ends of the hose 21 into the hose 21, the hose 21 cannot be easily pulled out from the connecting portions 26a and 27a even if a tensile force acts in the longitudinal direction of the hose 21. Further, since the hose 21 can be attached to and detached from the connection portions 26a and 27a of the first joint 26 and the second joint 27, the closing device 2 is repeated by replacing the hose 21 with a new hose when the hose 21 is damaged. Since it can be used, the cost can be suppressed.

As shown in FIG. 3, the bag 22 is provided with an opening 22a having a female screw portion (not shown), and the opening 22a is provided on the other end side of the above-mentioned second joint 27 (paper surface of FIG. 4C). By screwing to the male screw portion 27b provided on the right side), the bag 22 can be connected to the hose 21 via the second joint 27. Further, since the bag 22 can be attached to and detached from the male screw portion 27b of the second joint 27, the closing device 2 can be used repeatedly by replacing the bag 22 with a new bag 22 when the bag 22 is damaged. , Cost can be suppressed. The mounting structure of the bag 22 and the second connecting member 24 is not limited to the above, and for example, the opening of the bag has a male threaded portion and the second joint has a female threaded portion screwed to the male threaded portion. It may have a bayonet structure or a socket / insertion structure.

As shown in FIG. 4A, the protective member 25 is made of a metal material and is composed of a pair of side plates 25a and 25a (plate-shaped members) facing each other. Further, the side plates 25a and 25a are configured to be wider than the outer diameter of the hose 21 (see FIG. 4B). The protective member 25 is not limited to a metal material as long as it has at least a higher rigidity than the hose 21, and may be made of, for example, a high-strength resin material.

As shown in FIG. 4C, the first connecting member 23 is a substantially tubular body made of a metal material, and a step portion 23b is formed by partially expanding the diameter of the inner peripheral portion 23a thereof. The flange portion 26c of the first joint 26 described above is locked to the step portion 23b, and the insertion portion 26b provided on the other end side of the first joint 26 (on the left side of the paper surface in FIG. 4C). 1 23 is connected to the lower end portion 52b of the shaft member 52. The first connecting member 23 is not limited to the one made of a metal material, and may be made of a high-strength resin material or the like.

Further, a pair of projecting plates 23c and 23c having a substantially semicircular side view are provided on one end side of the first connecting member 23 (on the right side of the paper surface in FIGS. 4A to 4C), and these projecting plates 23c are provided. On the outer surface of the, 23c, the shaft portions 23f, 23f projecting laterally are projected substantially concentrically. These shaft portions 23f, 23f are inserted into the hole portions 25c, 25c formed on one end side (the left side of the paper surface of FIGS. 4A to 4C) of the side plates 25a, 25a of the protective member 25 described above. The protective member 25 is pivotally supported by the first connecting member 23.

As shown in FIGS. 4A and 4B, the protruding plates 23c and 23c have regulating portions 23d and 23d protruding in the thickness direction at positions on the outer peripheral side of the bending protective member 25 as described later, respectively. It is formed. The restricting portions 23d and 23d are provided at positions that substantially abut on the outer peripheral edge of the side plates 25a and 25a pivotally supported by the projecting plates 23c and 23c, and the side plates 25a and 25a are provided on the restricting portions 23d and 23d. The rotation of the protective member 25 with respect to the first connecting member 23 toward the regulating portion 23d can be restricted by bringing the protective member 25 into contact with the first connecting member 23.

As shown in FIG. 4C, the second connecting member 24 is a substantially tubular body made of a metal material, and is described above in the insertion port 24a formed on one end side (the right side of the paper surface in FIG. 4C). With the male screw portion 27b of the second joint 27 inserted, the flange portion 27c of the second joint 27 is tightened by bolts 16 and 16. The second connecting member 24 is not limited to the one made of a metal material, and may be made of a high-strength resin material or the like.

Further, a pair of projecting plates 24c and 24c having a substantially semicircular side view are provided on the other end side of the second connecting member 24 (on the left side of the paper surface in FIGS. 4A to 4C), and these projecting plates are provided. On the outer surfaces of the 24c and 24c, the shaft portions 24f and 24f projecting laterally are projected substantially concentrically. These shaft portions 24f, 24f are inserted into the holes 25d, 25d formed in the other end side of the side plates 25a, 25a of the protective member 25 described above (the right side of the paper surface in FIGS. 4A to 4C). As a result, the protective member 25 is pivotally supported by the second connecting member 24.

As shown in FIGS. 4A and 4B, the protruding plates 24c and 24c are formed with regulating portions 24d and 24d protruding in the thickness direction at positions on the outer peripheral side of the bending protective member 25, respectively. .. The restricting portions 24d and 24d are provided at positions that substantially abut on the outer peripheral edge of the side plates 25a and 25a pivotally supported by the projecting plates 24c and 24c, and the side plates 25a and 25a are provided on the restricting portions 24d and 24d. The rotation of the second connecting member 24 toward the regulating portion 24d with respect to the protective member 25 can be restricted by bringing the second connecting member 24 into contact with the protective member 25.

Therefore, the bending direction of the closing device 2 is restricted to one direction (right direction in FIG. 9) by the regulating portions 23d and 24d provided on the first connecting member 23 and the second connecting member 24.

Further, in this embodiment, the bending direction of the closing device 2 is a direction toward the downstream side of the fluid pipe 1 from the branch portion 3a. Further, in this embodiment, the first connecting member 23 is connected to the lower end portion 52b of the shaft member 52 in a state where the bending direction of the closing device 2 and the indicated direction of the arm 52c'provided on the shaft member 52 described above are aligned. ing.

As shown in FIG. 5, in a state where the closing device 2 is bent, the hose 21 connected between the first connecting member 23 and the second connecting member 24 has almost no change in length, and the hose 21 is connected to the second connecting member 24. The inner diameter where air flows is not crushed and is bent with a gentle curve. Further, the hose 21 is arranged inside the side plates 25a and 25a of the protective member 25, and both side portions in the bending direction are protected by the side plates 25a and 25a which are wider than the hose 21 as described above. Although not shown, the protective member 25 is formed in a substantially H-shape in front view by the side plates 25a and 25a of the protective member 25 and the connecting plate connecting them, and the side opposite to the bending direction of the hose 21 ( The upstream side of the fluid pipe 1) may be protected.

Next, the step of closing the fluid pipe 1 using the closing device 2 will be described in detail. First, as shown in FIG. 2, the shaft member 52 having the bag 22 in the non-expanded state at the tip thereof is directed toward the downstream side of the fluid pipe 1 with the opening 53b of the guide member 53 directed in the direction indicated by the arm 52c'. The arms 52c and 52c are gripped and the shaft member 52 is moved downward in a state of being positioned in the circumferential direction so as to be opened. At this time, the guide member 53 advances and moves downward together with the shaft member 52, and the lower end of the wall portion 53a of the guide member 53 abuts on the inner peripheral surface 1b of the fluid pipe 1, so that the guide member 53 advances and moves. Is finished (see FIG. 6). In a state where the lower end of the wall portion 53a of the guide member 53 is in contact with the inner peripheral surface 1b of the fluid pipe 1, the fluid is allowed to flow to the downstream side of the fluid pipe 1 through the through holes 53c and 53c provided in the wall portion 53a. Therefore, the work can be performed without obstructing the flow of the fluid in the pipe.

Next, as shown in FIG. 7, the shaft member 52 slides in the axial direction with respect to the insertion port 54b of the cap 54 of the guide member 53 that has finished moving, and the closing device 2 slides on the wall of the guide member 53. It will move further downward in the portion 53a.

Next, as shown in FIG. 8, as the lower end of the bag 22 is pushed into the inner peripheral surface of the fluid pipe, a reaction force from the inner peripheral surface acts on the protective member 25 to obtain a second. The connecting member 24 rotates to the downstream side of the fluid pipe 1, and the rotation of the second connecting member 24 promotes the rotation of the protective member 25 to the downstream side of the fluid pipe 1 with respect to the first connecting member 23. Then, the closing device 2 begins to gently bend to the downstream side of the fluid pipe 1. Further, when the second connecting member 24 to which the bag 22 is connected to the tip advances to the position of the opening 53b of the guide member 53, the outer surface of the non-expanded bag 22 receives the fluid flow and pressure of the fluid tube 1. The force that is swept downstream also acts to further promote bending. As described above, since the restricting portions 23d and 24d restrict the rotation of the protective member 25 to the upstream side, the protective member 25 rotates only to the downstream side. At this time, even if the protective member 25 rotates largely to the downstream side of the fluid pipe 1 with respect to the first connecting member 23, the side plates 25a and 25a of the protective member 25 that are wider than the hose 21 are opened at the openings 53b. Since the hose 21 can be preferentially contacted with the upper end portion of the protective member 25, the hose 21 arranged inside the side plates 25a and 25a of the protective member 25 is protected, and the hose 21 comes into contact with the perforated portion 1a of the fluid pipe 1 and is damaged. The fear can be avoided.

Next, as shown in FIG. 9, the moving position of the closing device 2 is moved downward by moving the shaft member 52 downward to a position where the upper end portion 52a of the shaft member 52 substantially abuts on the upper end surface of the introduction pipe 51. It can be aligned with the opening 53b of the guide member 53. It should be noted that the advancing position of the closing device 2 may be aligned with reference to the scale provided on the shaft member 52.

Then, a reaction force accompanying pushing the bag 22 is generated from the inner peripheral surface of the fluid pipe 1, and the bag 22 receives the flow and pressure of the fluid of the fluid pipe 1 and is swept downstream through the opening 53b. The second connecting member 24 rotates downstream with respect to the protective member 25, the protective member 25 rotates downstream with respect to the first connecting member 23, and the closing device 2 rotates downstream of the fluid pipe 1. It bends greatly to the side. According to this, the bag 22 can be easily introduced into the inside (downstream side) of the fluid pipe 1 from the branch portion 3a side by moving the shaft member 52 of the introduction device 5 downward.

Next, as shown in FIG. 10, the flow rate adjusting valve 11 is attached to the joint 10 provided at the upper end portion 52a of the shaft member 52 in a state where the closing device 2 is bent and the bag 22 is introduced inside the fluid pipe 1. By connecting and supplying air, the bag 22 can be inflated by the air sent from the flow path in the shaft member 52 and the hose 21, and the inside of the fluid pipe 1 can be closed to shut off the fluid.

As described above, the closing device 2 is the lower end of the second connecting member 24 for connecting the hose 21 and the bag 22 and the shaft member 52 constituting the introduction device 5 for introducing the bag 22 from the branch portion 3a into the fluid pipe 1. Since the first connecting member 23 connected to the portion 52b is connected by the protective member 25, the bag 22 inflated inside the fluid pipe 1 is connected to the fluid pipe 1 by the flow or pressure of the fluid in the fluid pipe 1. Since the protective member 25 can receive the tensile force acting by being swept downstream, the tensile force acting on the hose 21 can be reduced. In particular, the bag 22 in the process of expansion swings to the left and right as its outer surface expands, and receives a greater flow and pressure of the fluid in the fluid pipe 1, but the protective members 25 arranged on both the left and right sides make it possible. The tensile force acting on the hose 21 is significantly reduced, and air can be supplied to the bag 22 in a stable state of the hose 21. Since the bag 22 in the completed expansion state can resist the flow and pressure of the fluid due to the frictional force generated in close contact between the outer surface thereof and the inner peripheral surface 1b of the fluid tube 1, the hose described above can be used. The stable state of 21 can be maintained.

Further, by connecting the first connecting member 23 and the second connecting member 24 from the side plates 25a and 25a of the protective member 25, the relative distance between the first connecting member 23 and the second connecting member 24 is substantially constant. In addition, the side plates 25a and 25a are pivotally supported by the first connecting member 23 and the second connecting member 24, respectively, so that the protective member 25 rotates with respect to the first connecting member 23 and the second connecting member 24, respectively. Since the closing device 2 can be bent by the hose, only the stress in the bending direction can be applied without applying a tensile force to the hose 21.

Further, since the protective member 25 can protect both side portions of the hose 21 in the bending direction by the two opposing side plates 25a and 25a, it is possible to prevent the hose 21 from being damaged.

A pair of side plates 25a and 25a of the protective member 25 are provided with the hose 21 interposed therebetween, and are formed wider than the hose 21 so that the side plates 25a and 25a are formed between the pair of side plates 25a and 25a in a bent state. Since the wide side plates 25a and 25a can prevent the hose 21 from protruding, the side plates 25a and 25a can easily protect the hose 21.

Further, the introduction device 5 provides the second connecting member 24 for connecting the hose 21 and the bag 22 with the restricting portions 23d, 23d, 24d, 24d for restricting the rotation of the side plates 25a, 25a of the protective member 25. It is possible to provide a closing device 2 that bends only one direction of the fluid pipe 1 when the 22 is introduced into the inside of the fluid pipe 1 from the branch portion 3a side.

Further, in addition to the closing device 2 described above, as shown in FIGS. 11A and 11B, a non-woven fabric, a high-strength resin, or the like is formed on the outer peripheral portions of the first connecting member 23 and the second connecting member 24. By attaching the cover member 61, which is a substantially cylindrical tubular body that is deformable, using caulking members 62, 62, etc., the outer periphery of the hose 21 and the protective member 25 is covered with the cover member 61. You may. According to this configuration, the cover member 61 can protect the hose 21 arranged inside the protective member 25 in the circumferential direction without disturbing the bending of the closing device 2.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions that do not deviate from the gist of the present invention are included in the present invention. Will be.

For example, as the closing device 2'according to the modification 1 of the present invention, as shown in FIGS. 12A and 12B, the protruding plates 23c and 23c of the first connecting member 23 have the side plates 25a of the protective member 25. The second regulating portions 23e and 23e projecting in the thickness direction are formed at positions facing the regulating portions 23d and 23d with the 25a interposed therebetween, and the second regulating portions 23e and 23e are pivotally supported by the projecting plates 23c and 23c. By providing the second regulating portions 23e and 23e at positions separated from the edges of the 25a and 25a by a predetermined distance, the side plates 25a and 25a of the rotating protective member 25 are brought into contact with the second restricting portions 23e and 23e, and the protective member for the first connecting member 23 is brought into contact with the side plates 25a and 25a. It may be configured to limit the rotation range of the 25 to the second regulating portion 23e side.

Further, the second regulating portions 24e and 24e projecting in the thickness direction are formed at positions facing the regulating portions 24d and 24d with the side plates 25a and 25a of the protective member 25 sandwiched between the protruding plates 24c and 24c of the second connecting member 24, respectively. Then, by providing the second regulating portions 24e and 24e at positions separated from the edge of the side plates 25a and 25a axially supported by the projecting plates 24c and 24c at predetermined intervals, the second regulating portions 24e and 24e rotate to the second regulating portions 24e and 24e. The side plates 25a and 25a of the protective member 25 may be brought into contact with each other to limit the rotation range of the protective member 25 toward the second restricting portion 24e with respect to the second connecting member 24.

According to this configuration, since the closing device 2'can limit the range of the bending angle by the second regulating portions 23e and 24e provided on the first connecting member 23 and the second connecting member 24, the protective member 25 It is possible to prevent abrupt bending of the hose 21 arranged inside the side plates 25a and 25a, and to secure a flow path in the hose 21 in a state of being bent with a gentle curve.

The position of forming the second restricting portion in the first connecting member and the second connecting member is appropriately changed according to the angle of the branch portion with respect to the axial direction of the fluid pipe in order to limit the range of the bending angle of the closing device. It doesn't matter if it is a thing.

Further, for example, as the closing device 102 according to the second modification of the present invention, as shown in FIG. 13A, protective members 125, 125, ... The outer periphery of the hose 21 is covered with protective members 125, 125, ... While protecting, the closing device 102 may be configured to be bendable. Further, as shown in FIG. 13B, by providing a plate-shaped restricting portion 123d extending from the first connecting member 123 between the first connecting member 123 and the second connecting member 124, the closing device 102 is bent. It may be configured to regulate the direction.

Further, for example, as the closing device 202 according to the third modification of the present invention, as shown in FIG. 14A, the first connecting member 223 (tip portion of the introducing device) and the second connecting member 224 (connecting member). A protective member 225, which is a bellows-shaped tubular body made of a metal material, a resin material, or the like, is attached to the outer peripheral portion of the hose 21 by using a caulking member 262,262 or the like to protect the outer periphery of the hose 21 by the protective member 225. At the same time, the closing device 202 may be configured to be bendable. Further, as shown in FIG. 14B, by providing a plate-shaped restricting portion 223d to be tightened by a bolt 17 on the first connecting member 223 between the first connecting member 223 and the second connecting member 224. It may be configured to regulate the bending direction of the closing device 202.

1 Existing fluid pipe (fluid pipe)
2, 2'blocking device 3 housing 3a branch 5 introduction device 21 hose 22 bag 22a opening 23 first connection member (tip of introduction device)
23d Regulation unit 23e Second regulation unit 24 Second connection member (connection member)
24d Regulation part 24e Second regulation part 25 Protective member 25a Side plate (plate-like member)
26 1st joint 27 2nd joint 52 Shaft member 53 Guide member 53a Wall 53b Opening 61 Cover member 102 Closing device 123 1st connecting member (tip of introduction device)
123d Regulator 124 2nd connecting member (connecting member)
125 Protective member 202 Closing device 223 First connecting member (tip of introduction device)
223d Regulator 224 Second connecting member (connecting member)
225 Protective member

Claims (7)

A hose capable of feeding fluid from one end and a bag connected to the other end side of the hose and inflatable by the pressure of the fluid are provided, and the bag is branched from the fluid pipe by an introduction device. A closing device that is introduced into the inside of a fluid pipe in a continuous flow state and inflates the bag to close the inside of the fluid pipe.
The hose is a closing device configured to be detachably attached to a connecting member connecting the hose and the bag and a tip portion of the introduction device. The closing device according to claim 1, wherein the connection member and the tip end portion of the introduction device are provided with a connection portion having a hose disconnection prevention structure. The closing device according to claim 1 or 2, further comprising a protective member for connecting the connecting member and the tip end portion of the introduction device. The closing device according to claim 3, wherein the protective member has a higher rigidity than the hose. The closing device according to claim 3 or 4, wherein the tip portion of the connecting member or the introduction device includes a regulating portion that regulates the rotation of the protective member. The closing device according to any one of claims 1 to 5, wherein the bag is removable from the connecting member. The closing device according to any one of claims 1 to 6, further comprising a deformable cover member provided between the connecting member and the tip end portion of the introduction device.

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