JPH0526398Y2 - - Google Patents

Description

[Detailed Description of the Invention] ``Object of the Invention'' The present invention relates to a leak detection stopper, and aims to provide a stopper that can detect leakage at the end of a pipe and provide a seal.

(Industrial application field) A plug for sealing the end of installed piping and detecting leaks.

(Prior Art) In piping work, it is common to put a stopper at the end of the pipe. That is, a plug is placed on the end of the pipe to close it off, and when the pipe is to be extended, the plug is removed and the pipe is extended.

Conventionally, such water stop valves have been generally used to close the pipe by driving a stopper into the pipe body, but the inventor of the present invention created a stop valve with a U-shaped cross section between the push plate and the receiving plate. A plug body is provided in which a packing is inserted, the U-shaped packing is pushed outward by pressing the push plate against the receiving plate, and the bulging part of the packing thus pushed out is pressed and sealed to the inner surface of the pipe body. It has been proposed and has been put into practical use to some extent.

(Problems to be Solved by the Invention) Since it is not possible to check for leakage after installation of conventional water stop valves as described above, water often enters from the outside during use. In other words, it may not be possible to obtain an effective seal due to unevenness inside the pipe, and water and mud often seep in through the pipe end seal.Especially in gas pipes, it is not possible to wash out the inside of the pipe after piping is completed. The problem is big.

The above-mentioned disadvantages of the conventional devices can be appropriately solved by the above-mentioned proposal by the inventors of the present invention. That is, by pressing the push plate toward the receiving plate with the nut, the packing can be pushed out and effectively sealed. However, even in this case, complete sealing may not always be achieved due to partial deformation or attachments on the inner surface of the tube, and even if the tube is sealed in this way, leakage at the sealing position cannot be detected, so there are certain defects. There is no choice but to leave a mark of perfection.

"Structure of the invention" (Means for solving the problem) A pair of packings having a U-shaped cross section and an intervening plate positioned between the packings are provided between the receiving plate and the pushing plate, and A shaft member is attached to the plate and inserted through the packing, the intervening plate, and the push plate, and when the shaft member is pressed against the push plate, the nut is screwed together, and the above-mentioned packing, receiving plate, and A shaft hole is formed in the space formed between the push plates to connect a measuring device having a meter in the shaft member and a pipe line provided with a valve between the measuring device and a high-pressure air supply source. A coupler is provided, a high-pressure air supply source is communicated with the space through the shaft hole of the shaft member, and a cap having an engagement tube that engages with the nut and rotates the nut is attached to the coupler portion. A leak detection stopper characterized by being removably installed.

(Function) A pair of packings having a U-shaped cross section and an intervening plate positioned between the packings are provided between the receiving plate and the pushing plate, and the packings and the intervening plate are attached to the receiving plate. By providing a shaft member inserted through the shaft member, a nut screwed onto the shaft member can provide sufficient interference with the packing, and a sealing mechanism between the shaft member and the push plate can be incorporated.

In addition, by engaging and rotating the engaging tube provided on the cap with the nut screwed together with a sufficient tightening margin as described above, the packing mentioned above can be properly tightened with the nut. The tube is expanded in the circumferential direction and sealed to the inner surface of the tube.

A pipe line with a measuring device is connected to the coupler provided in the shaft member, and high-pressure air is injected into the space between both packings (i.e., the seal portion) through the shaft hole of the shaft member. The integrity of the pressure seal can be inspected by closing the valve, filling it with high-pressure air, and observing a meter provided in the sealed portion.

As described above, the cap having the engagement tube is covered with the nut and coupler portion with the measuring device removed, thereby protecting the coupler and nut portion and preventing damage and corrosion thereof.

By providing a protrusion on the pressure contact surface of the packing described above, the pressure of the contact surface for sealing can be sufficiently increased.

(Example) Specific embodiments of the present invention as described above are shown in the accompanying drawings. That is, in the present invention as well, a packing 5 having a U-shaped cross section is interposed between the receiving plate 1 and the pushing plate 2, and by tightening and pressing the pushing plate 2 with the nut 3, the packing 5 is pressed and expanded to form a tube body. The pressure sealing on the inner surface of 4 is the same as the previous proposal by the present inventors, etc., but in the present invention, the packing 5 as described above is adopted in combination, and the Between the packings 5, 5 interposed in a composite manner between the plate 1 and the push plate 2, a tapered surface is formed on these packings 5, 5 so as to obtain both the functions of the receiving plate 1 and the push plate 2 described above. The intervening plates 6 formed on the front and back sides are positioned, and the packing 5, 5, the receiving plate 1 and the pushing plate 2 are positioned.
A space 25 is formed between them. A thread 17 is formed on the distal end side of the shaft member 7 whose base end is fixed to the receiving plate 1, and the nut 3 is screwed thereto. A sealing material 13 such as an O-ring is provided between the receiver tube 8 and the shaft member 7 to ensure airtightness between the shaft member 7 and the receiver tube 8. .

A flange portion 8a is formed on the base end side of the receiver tube 8,
The nut 3 exerts a tightening action on the flange 8a, but another thread 18 is formed on the outside of the flange 8a, and the holder 9 is screwed into the thread 18. A locking edge 19 formed on the distal end side of the holder 9 is an engaging cylinder that engages with the aforementioned nut 3 during rotation in the circumferential direction, but does not engage during sliding action in the axial direction. 16 locking rings 15.

The shaft member 7 is provided with a shaft hole 12 which opens into the space 25 in the packings 5, 5 interposed in a composite manner as described above, and is used to pressurize air or other gas.
However, what is screwed onto the tip of the shaft member 7 is a coupler 10, and the coupler 10 is separately shown in FIG. A measuring section 21 such as this or a tube or other conduit having such a measuring device 21 is connected to the measuring device 21, and a valve 22 is provided between the measuring device 21 and a connection port to a high-pressure air source. A cap 20 as shown in FIG. 1 is configured to cover the coupler 10 under the condition that such a measuring device 21 is not connected to the coupler 10. The above-mentioned engaging tube 16 is fixed to the holder, and the engaging tube 16 has a square inner hole 1 so as to engage with the nut 3.
6a as shown in FIG. The cap 20 is designed to tighten or loosen the packings 5, 5 by pressing, that is, the cap 20 functions as a rotation adjusting operation section for the nut 3.

Note that the receiving plate 1, pushing plate 2, and intervening plate 6 have tapers for effectively pushing out the U-shaped packings 5, 5 in cross section toward the inner surface of the tube body 4 by rotation of the nut 3 as described above. As shown in the figure, the parts are arranged in circles. Furthermore, by forming two protrusions 5a, 5a on the outer surfaces of the packings 5, 5, a water-stopping effect is achieved by stress concentration on these protrusions 5a, 5a, and a stable sealing relationship is achieved. This is the reason why it is formed. Furthermore, as for the above-mentioned intervening plate 6, one prepared in the same shape as the receiving plate 1 and the pushing plate 2 was placed back to back as shown in FIG. It is sufficient to leave a gap 27 communicating between
It is designed to lead to.

To explain the operation of using the device according to the present invention as described above, it is as shown in FIG. 4 and described above.
By engaging the engaging cylinder 16 of the cap 20 with the nut 3 as shown in FIG. Press in 6 and pack each 5, 5
are balanced and tightened, and the middle part of the U-shaped cross section is extruded in the circumferential direction to seal the inner surface of the tube body 4.

In this state, remove the holder 9, the cap 20, and the engagement tube 16, and connect the pipe line 23 of the measuring device 21 to the thus exposed coupler 10 as shown in FIG. When high-pressure air is introduced through the pipe line 23, the high-pressure air is forced into the packings 5, 5 through the shaft hole 12, and the pressure conditions are displayed on the meter 24 of the measuring device. If this is done, when the valve 22 is closed, the space 2 inside each packing 5, 5
5, the pressure conditions are maintained, but if any of the seals in each packing are not perfect, the reading on the meter 24 will gradually decrease due to leakage. Therefore, the inner surface and other parts of the tube body 4 are wiped clean, and the above-described settings and tests are repeated. When the seal is confirmed to be complete, the measuring device 21 and the pipe line 23 are removed, the cap 20 having the engaging cylinder 16 and the holder 9 are covered over the coupler 10 and the nut 3, and the pipe end is backfilled. That is, the cap 20 and the holder 9 are the coupler 10 in this case.
It acts as a protective member for the coupler 10 and nut 3 parts, so that these coupler 10 and nut 3 parts will not be damaged even when backfilled into the soil layer, and will appropriately prevent corrosion etc. The mechanism of the present invention can be removed from the end of the pipe body 2, and further piping can be connected to the pipe end.

"Effect of the invention" According to the invention as explained above, it is possible to seal the end of a pipe or the like and to test the integrity of the seal at the sealing position (specifically, the joint position of the packings 5, 5). Therefore, it is possible to always seal the pipe ends in a perfect state, and it is possible to achieve accurate sealing of pipe ends such as gas pipes and water pipes with relatively simple operations. This is a practical idea that is highly effective when applied to pipes that do not have an inner lining and cannot be washed away after piping is completed.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention; Fig. 1 is a sectional view of the device according to the present invention in a set state at the end of the tube, and Fig. 2 is a partial front view of the device with the cap removed. , FIG. 3 is a partial perspective view of the interposed plate, and FIG. 4 is a partially cutaway side view of the interposed plate in a leakage detection state. In these drawings, 1 is a receiving plate, 2 is a push plate, 3 is a nut, 4 is a tube body, 5 is a packing,
5a is the projection, 6 is the intervening plate, 7 is the shaft material, 8 is the receiver, 8a is the flange, 9 is the holder, 10 is the coupler, 11 is the spot welding, 12 is the shaft hole, and 13 is the sealing material. , 14 is a connection port, 15 is a locking ring, 16 is an engagement tube, 16a is a rectangular inner hole thereof, 17 and 18 are respective threads, 19 is a locking edge, 20 is a cap, 2
1 is a measuring device, 22 is a valve, 23 is a pipe, 24 is a meter, and 25 is a space.

Claims (1)

[Claims for Utility Model Registration] 1. A set of packings having a U-shaped cross section and an intervening plate positioned between the packings are provided between the receiving plate and the pushing plate, and the intervening plate is attached to the receiving plate and A shaft member is provided that is inserted through the packing, the intervening plate, and the push plate, and a nut that presses against the push plate is screwed onto the shaft member, and a shaft member is formed between each of the packings, the receiving plate, and the push plate. a measuring device having a meter and a coupler for connecting a pipe line provided with a valve between the measuring device and the high-pressure air supply source; A high-pressure air supply source is communicated with the space through the shaft hole of the shaft member, and a cap having an engaging cylinder that engages with the nut and rotates the nut is removably attached to the coupler portion. A leak detection stopper characterized by: 2. The leak detection stopper as set forth in claim 1 of the utility model registration claim, in which a protrusion is provided on the pressure contact surface of the packing having a U-shaped cross section.