JPH0829288A - Jig for hermetical sealing of pipe end - Google Patents

Abstract

PURPOSE:To provide a jig, for hermetical sealing of a pipe end, by which the pipe end can be hermetically sealed surely and which can be attached and removed easily and quickly. CONSTITUTION:A bottomed cylindrical body 11, a gripping cover 12 which can be coupled to an outer flange 26 for a pipe 25 and a sliding plate 13 which is installed at the inside of the body 11 and which can be slid in the axial direction are installed. The gripping cover 12 is attached temporarily to the end part of the pipe 25, and a fluid is force-fitted into a cylinder 11A as an inside space between the bottom face of the body 11 and the sliding plate 13. Thereby, the sliding plate 13 is pressed to an end-part opening 25A so as to be hermetically sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end sealing jig, which can be used for leak inspection or the like in which the end of a pipe with an outer flange is sealed and the pressure inside the pipe is measured.

[0002]

2. Description of the Related Art Conventionally, when performing a leak inspection inside a pipe, first, a lid flange is attached to an outer flange portion of a pipe end, and a fluid is press-fitted into the pipe through a communication hole provided in the lid flange. Furthermore, the pressure drop inside the pipe with the passage of time is detected by a pressure gauge or the like to perform a leak test. At this time, it is general to attach the lid flange by fastening a plurality of bolts using bolt holes formed in the outer flange from the past.

[0003]

However, in the conventional attachment of the lid flange with a plurality of bolts, there is a problem that it takes a lot of time to tighten a large number of bolts. Further, since a plurality of bolts are tightened, there is a problem that fluid leakage in the pipe may occur due to partial tightening.

On the other hand, in recent years, JP-A-63-1560
As described in Japanese Patent Laid-Open No. 46-46945 and Japanese Patent Laid-Open No. 4-45946, the lid-shaped member is brought into pressure contact with the outer flange of the pipe end by tightening a single push bolt to easily seal the pipe end. A pipe end sealing jig has been developed to enable the above. However, even when these pipe end sealing jigs are used, it is still necessary to rotate and tighten the push bolts, etc. There is a problem that you can not.

On the other hand, in order to simplify the operation, it may be possible to attach a clamp or the like to the lid flange to facilitate the installation of the lid flange. However, the tightening force of the clamp changes depending on the thickness of the outer flange or the like. Or, there is a problem that it cannot be attached. On the other hand, if an attempt is made to adjust the tightening force to a predetermined value, there is a problem that a complicated work is required each time the mounting is performed. An object of the present invention is to provide a pipe end sealing jig that can reliably seal the pipe end and can be easily and quickly attached and detached.

[0006]

The pipe end sealing jig of the present invention achieves the above object by omitting a tightening operation of a bolt or the like by generating an adhesion force of an abutting member by the pressure of a fluid. Is what you are trying to do. Specifically, it is a pipe end sealing jig for sealing the end opening of a pipe with an outer flange, and has a bottomed cylindrical main body having an opening on one side and a bottom surface on the other side, and an opening of this main body. A locking portion that is formed to project radially inward on the end side and is engageable with the outer flange, and a contact portion that is housed inside the main body, is movable in the axial direction of the main body, and is in close contact with the end opening. It is characterized by comprising a contact member and a fluid flow hole for communicating an inner space between the bottom surface of the main body and the contact member to the outside.

Further, it is desirable that the outer circumference of the contact member and the inner circumference of the main body are brought into airtight sliding contact with each other through a seal member extending the previous week. Further, it is preferable that the abutting member is formed such that a central portion thereof on the internal space side is formed in a concave shape, and the end portion opening side is formed flat. A projected area in the moving direction of the contact member on the side of the internal space is larger than an opening area of the end opening, and the contact member has a fluid introduction hole that communicates the internal space with the inside of the end opening. Including that it is provided.

The locking portion has a tubular portion connected to the main body, and an inner flange having the same diameter formed on the opposite side of the tubular body from the main body. It is desirable that an insertion cutout portion that is continuous with the inner peripheral opening portion of the inner flange and that can radially pass through the outer flange be provided. Further, in the pipe end sealing jig of the present invention, the main body and the locking portion may be continuously integrated.

[0009]

In the present invention as described above, the main body is arranged at the pipe end, the pipe end opening is opposed to the contact member, and the outer flange of the pipe is positioned between the contact member and the locking portion. By press-fitting the fluid into the pipe, the pressure moves the contact member toward the opening end side, and the outer flange is locked by the locking part, and the contact member is pressed against the pipe end to seal the pipe end opening. To do.
Therefore, the conventional tightening operation of the bolt or the like is not required, the mounting is performed easily and promptly, the leakage of the fluid in the pipe due to the partial tightening of the bolt is prevented, and the reliable sealing can be performed. Thereby, the above-mentioned object is achieved.

Further, the airtightness of the internal space is further improved by bringing the outer circumference of the contact member and the inner circumference of the main body into airtight sliding contact with each other through the sealing material extending over the entire circumference.

Then, the axial cross section of the contact member is formed to be concave toward the inner space side, and the tube contact side is formed flat so that the airtightness between the end opening is improved. The complexity of gasket installation etc. can be eliminated. That is, conventionally, a gap is generated due to the warp of the joint surface of the outer flange of the pipe, etc., and it is difficult to form a completely airtight joint between the lid flange and the outer flange. Therefore, it is necessary to attach a gasket or the like for preventing leakage between the lid flange and the outer flange.

On the other hand, by forming the abutting member as described above, the central portion is thinned to reduce its rigidity, and the thinned portion is formed into the shape of the outer flange by the uniform pressure of the internal space. Because it deforms so that it sticks closely along,
The warp of the joint surface or the like is absorbed, and the pipe end is surely sealed by contacting the entire circumference of the inner peripheral edge of the end opening. Therefore, the hermeticity of the pipe end is further improved, the necessity of attaching a gasket or the like between the abutting member and the outer flange can be eliminated, and the workability is further improved.

Further, the projected area of the surface of the contact member facing the inner space side is made larger than the opening area of the end opening, and the contact member has a fluid introduction hole for communicating the inner space with the inside of the pipe. With this structure, the fluid flows into the pipe through this flow hole, and the contact member comes into close contact with the pipe end due to the difference in pressure receiving area between the internal space side and the pipe side. Therefore, if the pressure in the pipe is measured using this fluid as a measurement medium, a leak inspection or the like can be performed, and the work efficiency of the sealing work and the leak inspection is improved.

The locking portion is provided with a tubular portion connected to the main body, and an inner flange having the same diameter formed on the opposite side of the tubular portion from the main body. If the notch for insertion which is continuous with the peripheral opening and allows the outer flange to be inserted in the radial direction is provided, the outer flange can be inserted from the notch for insertion to facilitate installation at the pipe end. In addition, since the main body and the locking portion are continuously integrated to facilitate handling, installation at the pipe end becomes easier, and work efficiency is further improved.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a pipe end sealing jig 10 according to the present invention. Jig 10 for sealing the pipe end of the present embodiment
Is for attaching to an end of a pipe 25 used for piping of a petroleum refining plant or a chemical plant, and performing a leak inspection. Here, an end opening 25A is provided at the end of the pipe 25, and an outer flange 26 is formed around the end opening 25A. Further, the inside of the pipe 25 has an end opening 25A.
The flow passage 27 continues to the flow passage 27. The flow passage 27 can be blocked at the other end of the pipe 25 by a relay valve or the like not shown.

The pipe end sealing jig 10 includes a bottomed cylindrical main body 11 having a circular bottom surface and an opening at one end. Inside the main body 11, a cylindrical cylinder 11A which is an internal space
Is formed therein, and a sliding plate 13 as an abutting member is accommodated therein. A grip cover 12, which is a locking portion, is connected to the opening end side of the main body 11. A handle 14 is provided on the outside of the bottom surface of the main body 11, and a depressurizing hole 15 that is a fluid circulation hole is provided in the center.

The grip cover 12 is used to attach the main body 11 to the pipe 25, and the main body 1 is fixed by bolts 18.
It has a cylindrical portion 12A having the same diameter as the main body 11 connected to 1, and an inner flange 12B formed at the end of the cylindrical portion 12A on the side opposite to the main body 11. Further, the grip cover 12 is provided with an insertion notch portion 12C through which the outer flange 26 can be radially inserted so as to be continuous from the side surface of the cylindrical portion 12A to the inner peripheral opening of the inner flange 12B. With such a grip cover 12, it is possible to temporarily attach the pipe end sealing jig 10 to the end of the pipe 25 by inserting the outer flange 26 of the pipe 25 from the notch for insertion. In this temporarily attached state, the center of the tube end opening 25A and the center of the sliding plate 13 are arranged on substantially the same axis. .

The sliding plate 13 is formed in a concave shape on the bottom surface side of the main body 11 and is movable in the axial direction (arrow in FIG. 1) inside the cylinder 11A. Further, rubber sliding O-rings 21 are provided in two rows on the outer periphery of the sliding plate 13 to keep the cylinder 11A airtight. An O-ring 23 for contact is provided on the grip plate 12 side of the sliding plate 13, and a space between the sliding plate 13 and the grip cover 12 is a grip space 19.

Further, at the center of the sliding plate 13, a fluid introduction hole 24 for communicating the inside of the cylinder 11A with the end opening 25A.
Is provided. At this time, the outer diameter D of the sliding plate 13 is designed to be larger than the opening diameter d of the end opening 25A (that is, D> d), and the sliding plate 13 has a projected area of a surface in contact with the cylinder 11A at the end. It is larger than the projected area of the surface in contact with the opening 25A (flow passage 27).

The handle 14 is formed in a U shape and has a depressurizing hole 1
It is provided in two places in parallel with each other with 5 in between. The depressurization hole 15 is provided so as to communicate the outside with the inside of the cylinder 11A, and by installing a measurement gauge such as an air valve or a pressure gauge, depressurization and pressure measurement inside the pipe are possible.

In the following, the jig 10 for sealing the pipe end of the present embodiment will be described.
A work procedure in the case of performing a leak inspection of the pipe 25 by using and the operation of the pipe end sealing jig 10 will be described. First, hold the handle 14 and insert the notch 12C for insertion through the outer flange 2
6 is inserted and the pipe end sealing jig 10 is temporarily attached to the end of the pipe 25. Next, an openable / closable air valve (not shown) is attached to the depressurization hole 15 in a closed state, and a relay valve (not shown) connected to the other end of the pipe 25 is opened to flow high-pressure air of the measurement medium. Press into the passage 27.

At this time, the high-pressure air from the flow passage 27 is ejected from the end opening 25A of the pipe 25, part of which leaks to the outside through the insertion notch portion 12C, but the other part of the end opening. The fluid flows into the cylinder 11A through the fluid circulation hole 24 facing 25A to increase the internal pressure of the cylinder 11A. Then, as the internal pressure of the cylinder 11A rises, the sliding plate 13
Is pushed toward the pipe 25 and abuts the outer flange 26.
In this state, the high pressure air is prevented from leaking to the outside. When high-pressure air further flows in, the internal pressure of the cylinder 11A and the internal pressure of the flow passage 27 are equal pressure and are in equilibrium.

Here, the outer diameter D of the sliding plate 13 is equal to the end opening 2
Since the opening diameter d is larger than 5 A and the pressure receiving areas are different on the respective surfaces of the sliding plate 13 in the axial direction, even if the inside of the cylinder 11A and the inside of the flow passage 27 are at equal pressure, the inside of the cylinder 11A is The force toward the end opening 25A of the sliding plate 13 due to the pressure is the cylinder 11A of the sliding plate 13 due to the internal pressure of the flow passage 27.
Since the force exceeds the directional force, the sliding plate 13 is pressed against the end opening 25A of the outer flange 26 by the pressure corresponding to the difference in the force, and is kept in close contact. As a result, the pipe end sealing jig 10 is completely attached to the end of the pipe 25.

Further, since the axial section of the sliding plate 13 is formed to be concave on the bottom surface side of the main body 11 and the abutting side of the outer flange 26 is formed flat, the sliding plate 13 is formed.
The rigidity of the thin portion in the central portion is relaxed, and the thin portion is deformed along the shape of the outer flange 26 by the uniform pressure in the cylinder 11A, so that the warp of the contact surface of the outer flange 26 is absorbed, The pipe end is hermetically sealed by contacting the entire inner peripheral edge of the opening 25A.

Then, after the high-pressure air is continuously press-fitted for a predetermined time, the relay valve is closed to stop the press-fitting. Then, when a measuring gauge such as a pressure gauge is connected to the other side of the air valve and the air valve is opened, the pressure in the pipe 25 is displayed on the pressure gauge or the like. After that, after a predetermined time has elapsed, the pressure drop is measured by a pressure gauge or the like, so that a leak test of the pipe 25 is performed. Further, the pipe end sealing jig 10 is removed by closing the air valve, removing the measurement gauge, and opening the air valve again to release the pressure.

According to this embodiment, the following effects are obtained. That is, the operator is required to use the pipe end sealing jig 10
The outer flange 26 when the pipe is installed at the pipe end.
It can be easily carried out by accommodating it in the gripping space 19 through the two notches 12C. Further, by injecting a fluid such as high pressure air from the side of the flow passage 27, the pipe end opening can be easily sealed. As a result, it is not necessary to tighten and attach the bolt as in the prior art, so that the sealing work can be facilitated, the working time can be significantly shortened, and the bolt can be securely tightened without partial tightening.

Since the sliding plate 13 is provided with a fluid introduction hole 24 which communicates the cylinder 11A and the end opening 25A, the pipe 2 with high pressure air for sealing the pipe end as a measuring medium.
5 can be checked for leaks. Accordingly, it is not necessary to separately press-fit the measurement medium after the pipe end is closed, so that the work efficiency of the leak inspection can be improved.

Here, in order to confirm the easiness of the work,
Using the pipe end sealing jig 10 of the present example and the conventional lid flange, the total working time when a leak test was performed was compared. At this time, the pipe was a 1 / 2B flange type, the inspection pressure was 8 kg / square cm, and the pressurizing medium was air. According to the result, when the conventional lid flange was used, the total work time was 2 hours and 3 hours (6 hours), whereas when the pipe end sealing jig 10 was used, the total work time was 2 hours. The working time for one person was 1 hour (1 hour person), and the working efficiency could be improved 6 times. The above-mentioned effect was also confirmed from this result.

Further, the sliding plate 13 has a sliding O-ring 2
Since 1 is attached, the airtightness in the cylinder 11A can be improved. As a result, the sliding plate 13
Can be pressed against the outer flange 26 in a stable state over a long period of time.

Further, the sliding plate 13 is formed so that its axial cross section is concave toward the cylinder 11A side, and the rigidity of the thinned central portion is relaxed, so that the end opening 25 is formed as described above.
The airtightness of A can be improved. Further, since the contact side of the sliding plate 13 is flat, the sliding plate 13 is fixed to the end opening 25A even if the opening diameter of the end opening 25A is different.
It is possible to make close contact with the inner peripheral edge over the entire circumference, and the hermeticity can be further improved.

Further, the sliding plate 13 is provided with a sealing O-ring 23, and the thin wall portion seals the inner peripheral edge of the end opening 25A and the sealing O-ring seals the pipe 25. The hermeticity can be further improved.
As a result, the work efficiency can be improved by omitting the attachment of a gasket or the like which has been conventionally used.

Since the grip cover 12 is integrated with the main body 11, it is not necessary to separately carry the main body 11 and the grip cover 12 when carrying the pipe end sealing jig 10, etc. It can be easily handled when installing on the pipe end. Further, the main body 11 has a handle 14
Since it is provided, it is possible to carry the pipe end sealing jig 10 and install it on the pipe end more easily.

The present invention is not limited to the above-mentioned embodiments, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are included in the present invention. For example, although the sliding O-ring 23 is provided on the side surface of the sliding plate 13 in the above-described embodiment, the sliding O-ring 23 is not limited to rubber, and a commonly used material is used. May be appropriately determined in consideration of the measurement pressure for leak inspection, the type of measurement medium, and the like. Also, the sliding plate 13 and the cylinder 1
The sliding O-ring 23 may be omitted, for example, by making the gap with 1A small to make it airtight with a lubricating oil film.
However, the provision of the sliding O-ring 23 is desirable because the gap can be increased and the workability and slidability are improved.

In the above embodiment, the sliding plate 13 is the main body 11
Although it is formed in a concave shape on the bottom surface side, it may not be formed in a concave shape. However, the configuration as in the above-mentioned embodiment is desirable from the viewpoint of improving the hermeticity of the pipe end and omitting the gasket.

In the above-described embodiment, the high-pressure air is press-fitted from the flow passage 27 side, but the relay valve may be closed and the air valve may be opened to press-fit from the depressurization hole 15. Further, at this time, when there is no circulation hole 24 or can be sealed with a bolt or the like, the press-fitted fluid from the depressurization hole 15 is sealed in the cylinder 11A,
A leak test may be performed by attaching a valve or a pressure gauge for press-fitting the measurement medium to the pipe 25. However, by providing the flow hole 24 and press-fitting the measurement medium from the depressurizing hole 15 or the flow passage 27 side, the end opening can be closed and the measurement medium can be press-fitted at the same time, which improves working efficiency, which is preferable. .

In the above-mentioned embodiment, the pipe end sealing jig 10 is used for leak inspection of the pipe 25. However, as described above, the press-fitting fluid is sealed in the cylinder 11A so that the pipe 2 is closed.
The end opening of No. 5 can be hermetically sealed, and can be used as a pipe end sealing jig even when a leak test is not performed.

In the above embodiment, air was used as the press-fitting fluid, but the fluid is not limited to air and may be nitrogen gas or the like. The press-fitted fluid may be a liquid such as water or oil in addition to gas, and may be appropriately determined in consideration of the actual usage conditions of the pipe 25.

In the above-described embodiment, the depressurizing hole 15 is provided at one place in the cylinder 11A, but the depressurizing hole and the hole for attaching the measuring gauge or the like may be provided separately. By doing so, when removing the pipe end sealing jig 10, it is possible to save the troublesome work of removing the measuring gauge and depressurizing it, so that the working efficiency is further improved.

In the above embodiment, the grip cover 12 is connected to the main body 11 by the bolt 18, but the connecting method may be welding or the like. Further, the main body 11 and the grip cover 12 may be integrally manufactured in advance by machining such as shaving or injection molding of synthetic resin.

In the above embodiment, the gripping cover 12 is provided with an insertion notch 12C for inserting the outer flange 26 therethrough.
Is provided, but the size of the notch is the outer flange 2
It may be arbitrarily determined as long as 6 can be inserted and has a predetermined strength.

The grip cover 12 has an inner flange 12B.
The outer flange 26 is configured to be locked with, but, for example, a plurality of L-shaped protrusions are formed on the outer peripheral edge of the body 11 at predetermined intervals, and the tip side of the protrusions is the body 11 of the outer flange 26. It may be a structure or the like that engages with the surface on the side opposite to. However, it is preferable to form the flange shape as in the above-mentioned embodiment because the structure becomes simple.

Then, the grip cover 12 is divided into two parts of a half-divided structure in which the insertion notch 12C is omitted, one of them is connected to the main body 11 in advance, and the other is attached after the outer flange 26 is inserted. Alternatively, the grip cover may include a portion integrated with the main body 11 and a divided portion.

Further, one end of the main body 1 engages with the outer flange 26, and the other side extends through the side surface of the main body 11 to extend the main body 1.
The structure may be such that it engages with the bottom surface of the main body 11, and the bottom surface of the main body 11 and the outer flange 26 are sandwiched and held, and a grip cover or the like separate from the main body 11 may be used. Further, in the separate structure, the opening side of the main body 11 is formed into an outer flange shape having the same diameter as the outer flange 26, and after both flanges are brought into contact with each other, the outer peripheries of both flanges can be sandwiched at the same time. A grip cover having a U-shaped cross section may be used.

In short, it suffices that the grip cover, which is formed so as to project radially inward and has a locking portion that engages with the outer flange 26, is provided on the open end side of the main body 11. However, by preliminarily integrating the main body 11 and the grip cover as in the above-described embodiment, the installation at the pipe end 25 becomes easy,
It is easy to carry and handle. In addition, it is preferable because it prevents loss of another member.

The material of the pipe end sealing jig 10 may be appropriately selected from generally used metal materials, synthetic resin materials and the like in consideration of the type of measurement medium, measurement pressure and the like.

[0046]

As described above, according to the present invention, since the abutting member is brought into close contact with the pipe end by the pressure of the press-fitting fluid, it is not necessary to use the conventional bolt tightening, and it is easy, quick and accurate. In addition, there is an effect that the pipe end can be closely attached. Further, by making the contact member and the main body airtightly in sliding contact with each other via the seal member, the airtightness in the main body is improved, and the contact member can be sealed in a stable state for a long period of time. effective.

By forming the abutting member in a concave shape on the bottom surface side of the main body, the thin center portion is deformed along the shape of the abutting portion of the outer flange, and closely contacts the entire circumference of the inner peripheral edge of the pipe end. Since it is possible to further improve the airtightness of the pipe, it is possible to omit attachment of a gasket or the like, and it is possible to improve work efficiency. Furthermore, by providing the contact member with the fluid introduction hole, it can be used for leak inspection in the pipe using the press-fitted fluid as the measurement medium, and the effect that the pipe end sealing work and the leak inspection can be performed efficiently. is there.

Further, the tubular portion of the locking portion is provided with the notch for insertion which is continuous with the inner peripheral opening of the inner flange and which allows the outer flange to be inserted in the radial direction. There is an effect that can be done. Then, by integrally integrating the main body and the locking portion, there is an effect that they can be easily handled when carrying or installing on the pipe end.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a right side view of the embodiment.

FIG. 3 is a left side view of the embodiment.

FIG. 4 is a perspective view of the embodiment.

[Explanation of symbols]

 10 Pipe End Sealing Tool 11 Main Body 11A Cylinder 12 Gripping Cover that is a Locking Part 12A Cylindrical Part 12B Inner Flange 12C Insertion Notch 13 Sliding Plate that is a Contact Member 15 Depressurizing Hole that is a Fluid Circulation Hole 21 Sliding O-ring that is a sealing member 24 Fluid introduction hole 25 Pipe 25A End opening 26 Outer flange

Claims (6)

[Claims] 1. A pipe end sealing jig for sealing an end opening of a pipe with an outer flange, comprising a bottomed cylindrical main body having an opening on one side and a bottom surface on the other side, and an opening of this main body. A locking portion that is formed to project radially inward on the end side and is engageable with the outer flange, and a contact portion that is housed inside the main body, is movable in the axial direction of the main body, and is in close contact with the end opening. A pipe end sealing jig, comprising: a contact member; and a fluid flow hole for communicating an inner space between the bottom surface of the main body and the contact member to the outside. 2. The pipe end sealing jig according to claim 1, wherein the outer circumference of the contact member and the inner circumference of the main body are in airtight sliding contact with each other through a seal member extending over the entire circumference. Jig for pipe end sealing characterized by 3. The pipe end sealing jig according to claim 1 or 2, wherein the contact member has a concave central portion on the internal space side and a flat end opening side. A jig for sealing a pipe end, which is characterized by being formed. 4. The pipe end sealing jig according to any one of claims 1 to 3, wherein a projected area in a moving direction of the contact member on the internal space side is larger than an opening area of the end opening. A pipe end sealing jig is characterized in that the contact member is provided with a fluid introduction hole that communicates the internal space with the inside of the end opening. 5. The pipe end sealing jig according to claim 1, wherein the locking portion is a tubular portion connected to the main body, and the tubular portion is opposite to the main body. An inner flange formed on the side, and the cylindrical portion is provided with an insertion notch portion that is continuous with the inner peripheral opening of the inner flange and that can radially insert the outer flange. A jig for sealing pipe ends, characterized by: 6. The pipe end sealing jig according to any one of claims 1 to 5, wherein the main body and the locking portion are continuously integrated. Jig for edge sealing.