JPH08326988A - Sealing method of pipe - Google Patents

Abstract

PURPOSE: To provide a method and a device for stopping tube fluid flow working efficiently under a pressure higher than a conventional one. CONSTITUTION: A positioning device 2 is airtightly installed onto a tube 1, in which fluid flow is to be stopped, and the tube is bored through the positioning device 2. An expandable body 8 is inserted into the tube 8 by means of a closing apparatus 7 housed inside a supporting tube 9 through the bore. For temporarily closing the fluid flow inside the tube, the expandable body 8 is supported when/after it is inserted, especially when/after it is expanded against the fluid flow inside the tube, and high pressure resistive ability against a high fluid pressure is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for closing a fluid in a pipe, in which a positioning device is hermetically provided on the pipe,
A hole is made in the tube through the positioning device while maintaining airtightness, an inflatable body can be inserted into the positioning device using a closure, and a hole is made in the tube to temporarily close the flow of fluid in the tube. A method and apparatus for inserting an inflatable body through a tube into a tube, the inflatable body being supported by a support tube inserted into the positioning device during insertion into the tube and during expansion in the direction of fluid flow within the tube The tube relates to a method and device characterized in that it holds a closure inserted through a positioning device.

[0002]

2. Description of the Related Art Conventional methods and devices for temporarily shutting off fluid flow in a pressure tube while maintaining airtightness include, for example,
As described in Swedish Patent Nos. 8605208-1 and 9301793-7, in which the rubber balloon-shaped inflatable body inserted in the tube to be closed expands to close the tube. It is disclosed. In this example, the rubber balloon remains in place only due to the slight frictional force on the inner surface of the tube. Therefore, if the fluid is at high pressure, or if the piping system is pulsating, the utility of this device is diminished. Due to high pressure or pulsation, the rubber balloon easily slides on the inner surface of the tube and eventually bursts. Furthermore, the inner surface of the welded pipe is not always smooth, and sharp burrs on the weld line easily damage the sliding rubber balloon, resulting in the rubber balloon bursting.

[0003]

The object of the present invention is to achieve a method and a device as claimed in the claims, thereby obviating the drawbacks of the prior art mentioned above and under higher pressure than ever before. It is possible to use the current closing method, and it is possible to significantly prevent the rupture of the closing expansion body.

[0004]

SUMMARY OF THE INVENTION The above object is to have a closure and an inflatable body, the lower end portion of which projects into the pipe, the lower end portion of which gradually forms a half-split pipe, the opening of which is the fluid in the pipe. Can be achieved by inserting a support tube facing in the flow direction into the tube through a positioning device. When the support pipe is inserted deep into the pipe, it reaches the bottom of the pipe, and the lower end of the support pipe supports the inflatable body that has expanded and is located at a fixed position inside the pipe regardless of the frictional force between the expander and the inner surface of the pipe. Hold the expander. This is especially important when the heating tube is closed, as the warm fluid tends to reduce the frictional force between the tube and the rubber balloon anyway, and also when closing a large diameter tube,
The support tube is important because it allows the rubber balloon to expand significantly. Thus, a rubber balloon of a given size, for example a rubber balloon sized to the size of the holes drilled in the tube, can be used for tubes of various diameters. That is, the number of balloons of different sizes can be reduced. Practical test results have shown that the closure method according to the present invention can withstand 3 to 5 times higher fluid pressure in the pipe than conventional closure methods using the same inflated rubber balloon.

In order to further enhance the action of the support tube, particularly in the case of a large-diameter tube, the flat lower end portion of the half-tube shaped support tube facing the flow direction of the fluid in the tube is gradually formed into a half-rod shape. It is also possible to attach a flap that automatically lowers to the flat part of the rod. The flap is slidably mounted and lowers to the lower surface when the lower end of the tubular support reaches the bottom of the tube. Conversely, the flap causes the closure to be withdrawn from the interior of the tube and when the flap contacts the inner surface of the top of the tube, retracts into the center of the rod, allowing the support tube to be withdrawn through the hole in the tube.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention, and an embodiment of which is set forth in the claims and the attached drawings, FIG. 1 is a side view of the present invention, in which a support tube is inserted into a positioning device and an expansion The possible body has not yet been inserted inside the tube to be closed and the closure is at the top of the support tube. 2 is a side view similar to FIG. 1, but after inserting the expandable body inside the tube. FIG.
FIG. 5 is a similar side view, but with the expandable body expanded within the tube to close the tube. FIG. 4 is a schematic cross-sectional view of the support tube, showing a state of the flap before the support tube is inserted inside the tube. FIG. 5 is a schematic cross-sectional view of the support tube, showing a state in which the flap is lowered after the support tube is inserted inside the tube.

In FIG. 1, 1 is a part of the tube to close the fluid flow, 2 is a positioning device, which is hermetically attached to the tube by means of a threaded connector (not shown). The positioning device is provided with a valve device 5 actuated by a drill or support tube 9 and a threaded extension 12 with an inner seal 4 at the uppermost end which hermetically seals the drill or support tube 9. The extension 12 is provided with a rotatably arranged fixing clamp 15 by means of which the fixing device 14 fixes the extension. Fixing device 14
Consists of a fixed cylinder 16 with a spring spring 19 whose fixing pin engages with the groove 17 of the closing device to fix the closing device 7 when the support tube 9 is inside the positioning device 2 and its extension 12, After the closure has been inserted into the tube 1 with the inflatable body 8, it engages the groove 18 of the closure to secure the closure 7. The support tube 9 consists of a thin-walled tube which can move vertically inside the positioning device extension, which is hermetically sealed by the sealing body 4. The upper portion has a collar, which maintains the relative positional relationship between the support tube and the extension. The part of the support tube projecting into the tube 1 gradually forms a half-tube 10, the opening 11 of which faces the direction of fluid flow in the tube, in particular the expandable body expands,
It is intended to act as a support for the inflatable body while closing the flow of fluid in the tube. The closure 7 together with the inflatable body 8 is inserted in the support tube 9 with the fixing device 14,
The fixing pin of the fixing device meshes with the groove 17 of the closing device inside the positioning device 2 and the extension 12 thereof, so that the fixing device 7 is closed.
Is fixed with a fixed clamp. In this position, the lower part 10 of the support tube is in its final position inside the tube 1, but the inflatable body 8 is in the space 6 of the positioning device.

In FIG. 2, the fixed cylinder 16 is the groove 1 of the closing tool.
Figure 7 shows the position of the closure 7 after it has been separated from the closure 7, which is pushed into the tube 1 with the inflatable body, the fixed cylinder-1
6 engages with and secures the groove 18 of the closure. At the upper end of the closure, the connecting pipe 25 having a closing plug, the compressed air connecting pipe 2
6 and a multi-branch pipe 24 having a connecting pipe or a pressure gauge 27.

In FIG. 3, compressed air is supplied through the connecting tube 26 to a sufficient pressure to expand the expandable body. The pressure is read by the pressure gauge 27. The expanded inflatable body closes the tube.

After closing, the closing tool is removed by the reverse operation. The compressed air is exhausted through the connecting pipe 26, and the closing device 7
Is withdrawn until the fixed cylinder engages the groove 17 of the closure. The support tube with the closure is removed from the fixed clamp and withdrawn from the positioning device. After that, the valve device 5 is automatically closed to prevent the fluid from leaking from the pipe 1.

FIG. 4 shows flaps 20a, 2 which are automatically lowered and returned before being inserted into the tube 1.
0b shows a schematic cross section of a support tube 9 provided with 0b. Although the flaps overlap each other in this state, the two headed pins 22 are slidably slidable on the flat surface of the rod at the lower end of the support tube.
And is slid along a groove 21 provided on the flap at an angle of 45 ° with respect to the horizontal plane.

FIG. 5 shows the closing device when the support tube is completely inserted into the tube 1. Here, the flaps increase the support area. Flap 2 in the lowered position
Since 0a, 20b extend further below the rod of the support tube, when the support tube is inserted into the tube, the flap is spread outwards by the groove provided at an angle. Conversely, when the support tube is pulled out of the tube, the flap returns to its original position.

The present invention is not limited by the embodiments shown above, but the support portion of the support tube can be, for example,
Other solutions may be included, such as expanding with means such as open wings or hinged flaps.

[0014]

According to the present invention, it is possible to use the existing closing method under a higher pressure than ever before, and it is possible to greatly prevent the closing expansion body from bursting.

[Brief description of drawings]

1 is a side view of a closure device according to the present invention, the support tube being inserted into the positioning device, the inflatable body not yet inserted into the tube to be closed, the closure being the upper part of the support tube, FIG. It is in.

FIG. 2 is a side view similar to FIG. 1, but after inserting the expandable body inside the tube.

FIG. 3 is a similar side view, but with the expandable body expanded within the tube to close the tube.

FIG. 4 is a schematic cross-sectional view of the support tube, showing a state of the flap before the support tube is inserted inside the tube.

FIG. 5 is a schematic cross-sectional view of a similar support tube, showing a state in which the flap is lowered after the support tube is inserted inside the tube.

[Explanation of symbols]

 1 Pipe 2 Positioning Device 4 Inner Seal 5 Valve Device 6 Space 8 Expandable Body 9 Support Pipe 10 Half Divided Pipe 11 Half Divided Pipe Opening 12 Support Pipe Extension 13 Color 14 Fixing Device 15 Fixed Clamp 16 Fixed Cylinder- 17 Grooves 18 Grooves 19 Spring Springs 20 Flaps 21 Groove Holes 22 Headed Pins 23 Recesses 24 Multi-branch Pipes 25 Connection Pipes with Closing Plugs 26 Compressed Air Connection Pipes 27 Pressure Gauges

Claims (5)

[Claims] 1. A method for temporarily arranging an inflatable body (8) inside a pressure tube (1) containing a fluid, wherein a positioning device (2) is arranged at a position where the inflatable body (8) is to be arranged. Placed on the tube of the device such that there is a tight seal between the tube surface and the positioning device (2) and a drill or closure (7) is inserted through the perforated channel (3) into the extension (12) of the positioning device. ,
The extension (12) of the positioning device is provided with a seal (4) that hermetically seals the perforated channel when a drill or closure (7) is inserted into the channel, and the drill or closure. A releasable valve device (5) is provided between the perforated channel and the space (6), the drill is removed after the hole has been opened, the valve device (5) is automatically closed and the closure is used. A method of inserting an inflatable body into a tube through a perforated channel of a positioning device, in which a closure tube (7) and an attached inflatable body (8) are housed together in a support tube (9), The lower part of the support tube (9) gradually forms a half tube (10), the opening (11) of the half tube (10) faces the fluid in the tube, and the support tube (9) is closed using a closure. ) Through the expandable body (8) in the pipe (1) And the support tube (9) acts as a support for the inflatable body (8) when it is inflated and when the inflatable body (8) closes the flow of fluid. how to. 2. An apparatus for carrying out the method according to claim 1, wherein the support tube (9) is an extension (1) of the positioning device.
2) It consists of a thin-walled thick tube that can move vertically inside, and the thin-walled thick tube is hermetically sealed by a sealing body (4),
On top of the thin-walled thick tube is a color (1) which defines the position of the support tube (9) in relation to the positioning device extension (12).
3) is provided, the collar (13) of which is fixed to the positioning device extension by a fixing device (14) using a rotatable fixing clamp (15) provided in the positioning device extension, the pipe (1) A part of the support tube (9) protruding inward gradually forms a half tube (10), and the opening (1
1) A device characterized in that it faces the direction of fluid flow in the pipe. 3. The device according to claim 2, wherein said fixing device (14) comprises a spring (19) actuated fixed cylinder (16), and a fixing pin of the cylinder (16) is the support tube (16). 9) is inside the positioning device (2) and the extension (12), the closure (7) is inserted into the groove (1).
7) and then inserted into the tube (1) with the inflatable body (8) to which the closure (7) is attached.
8) A device characterized by being fixed using. 4. The device according to claim 3, wherein a part of the support pipe (9) protruding into the pipe (1) gradually forms a half-split pipe and faces the flow direction of the fluid in the pipe. On the flat surface of the split tube, two headed pins (22) and two flaps (21) provided at an angle of 45 ° with respect to the horizontal plane to slide a flap in a lateral direction ( 20
a, 20b), each flap extending along two headed pins on the flat surface of the half-tube or returning to the retracted position in which they overlap each other. Device characterized in that it is provided with two recesses (23) through which the headed pin (22) passes. 5. The device according to claim 4, characterized in that the distance between the lower end of the flap (20a, 20b) in the retracted position and the lower end of the support is longer than the vertical height of the slot (21). apparatus.