JPS59208434A - Apparatus for sealing tube end against liquid pressure - Google Patents

Abstract

PURPOSE:To apply specified liquid pressure, by contacting the end of a tube to the sealing part of the tube end of a movable sleeve, which is inserted into a spool of a frame that is fixed by tie rods, setting the structure in this way, and obtaining the thickness of the tube, which is to be used for the final purpose. CONSTITUTION:A frame 4' is linked by tie rods 5, 5.... A spool 9 is fixed in the inside of the frame through bolts 8, 8.... A tapered flare 15 is formed at a tube end 2 of a tube 1 so that the flare 15 agrees with a tapered part 14 of the sealing part of a sleeve 11 by an appropriates means. The flare 15 is made to agree with said tapered part 14 of the sleeve 11, which is slidden in the water drained spool 9 in a watertight manner. A sealing jaw 16 is contacted from the outside, and tightened to a flange part 13 by the bolt 8. Thus the tube end 2 of the tube 1 is tightened to the entire surface of the tapered part 14 of the sealing part of the sleeve 11 in a watertight state. Then a starting switch is depressed and a high pressure water pump is operated through a switching valve. Then high pressure water is sent in a feeding and draining chamber of the spool 9 through a water introducing port 6'.

Description

[Detailed Description of the Invention] Technical Classification/Field> The disclosed technology belongs to the field of hydraulic sealing technology for pipe ends used for hydraulic pressure testing and hydraulic expansion of various pipes.

<Explanation of the gist> The invention of this application is a pipe end hydraulic sealing device used for pipe pressure tests and hydraulic expansion, in which the main body of the sealing device is closely pressed against the entire circumference of the end of the pipe to be set. This invention relates to a pipe end hydraulic sealing device which is equipped with a supply/discharge frame for supplying pressure liquid to the inside of the pipe and is tightened between the frames via a tie rod, and in particular, a spool is attached to the frame. The proximal end of the spool is fixed, a sleeve having a ring-shaped stepped portion is slidably inserted onto the spool, and a tube end seal portion is formed at the distal end of the sleeve so as to be brought into close contact with the tube end. On the other hand, the present invention relates to a pipe end hydraulic sealing device, in which a pressure fluid supply/discharge cavity for pumping pressure fluid into the pipe is provided inside the spool, extending over the end thereof and communicating from the sleeve to the sealing portion.

<Prior Art> As is well known, piping is widely used in many industrial fields, and depending on its use, pressure resistance and corrosion resistance are particularly required. Corrosion-resistant treatment such as pipe expansion is carried out.

In this type of work on the tube body, considerable hydraulic pressure acts inside the tube, and therefore a tube end hydraulic sealing device is required.

The general form of the pipe end hydraulic sealing device that has been commonly used in the past is as shown in FIG. The frames 4.4 at both ends are pressed and sealed via the tie rods 5.5, the water inlet 6 of one frame 4 is closed, and a predetermined high pressure is applied from the water inlet 6 of the frame 4 being used. Supplying water under pressure into the pipe 1 to carry out the specified work:
is being kept.

Even though, above)! 11 In the conventional pipe end hydraulic sealing device, as the pressure of the pressurized water supplied into the pipe 1 rises, the pressure of PxS, which is obtained by applying an overpressure P to the cross-sectional area S of the limb pipe 1, increases as the axis. As a result, the tie rod 5 stretches and the sealing function of the seal 3 deteriorates, resulting in leakage. There was a problem that the tube could not be expanded.

To deal with this, it is possible to make the preload of the packing 3 sufficiently large and the tension of the tie rod 5 sufficiently large. When the pressure was large, there were yellow dots such as buckling deformation of the limb canal 1 due to the excessive compressive load applied to the canal 1.

3- Also, there was a disadvantage that the designed thickness of the tube 1 to be used for the final purpose did not match the above-mentioned thickness, resulting in an increase in cost.

<Object of the Invention> The object of the invention of this application is to solve the problem of the sealing of the pipe end hydraulic sealing device based on the above-mentioned prior art, while keeping the thickness of the pipe to the thickness of the pipe for the final use. An object of the present invention is to provide an excellent pipe end hydraulic sealing device that can apply a prescribed hydraulic pressure, seal reliably, and prevent buckling deformation, etc., and is useful for pipe utilization in various industries. It is.

<Structure of the Invention> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the above-mentioned claims in accordance with the above-mentioned object, is to provide a movable sleeve which is fitted onto a spool of a frame fixed by a tie rod. The pipe end of the pipe is set in contact with the pipe end seal part, and a predetermined pressure liquid is supplied from the spool to create a pressure of 4- from the sleeve into the pipe via the liquid supply and drainage cavity of the spool. A liquid is applied to perform a predetermined operation, and during this time, the applied liquid pressure increases and the axial force due to the pressure inside the pipe also increases, but the ring-shaped step part of the sleeve of the sealing device main body outside the spool Since the applied liquid is equal to or greater than the axial force, the seal at the pipe end is reliably maintained and there is no leakage, and furthermore, the hydraulic cylinder fixed to the frame is A technical measure is taken in which the iron is fixed to the bracket of the sleeve to further ensure the sealing of the sealing part.

<Embodiment - Configuration> Next, an embodiment of the invention of this application will be described as follows based on FIG. 2.3. Note that the same parts as in FIG. 1 will be explained using the same reference numerals.

In the embodiment shown in FIG. 2, numeral 7 is a pipe end hydraulic sealing device which constitutes the gist of the invention of this application, and is used for sealing the pipe end 2 of the pipe 1. Although this is shown, tie rods 5.5, .
・It is connected and combined by.

The frame 4' has bolts 8.8 inside it.
A spool 9 is fixedly installed through the spool 9, and a water supply and drainage cavity 10 is formed inside the spool 9 through a water inlet 6' connected to a high pressure water pump (not shown).

Reference numeral 11 denotes a sleeve, which has a supply/discharge cavity 10' formed therein with a ring-shaped stepped portion 12 having a predetermined depth as described below. The spool 9 is slidably and fluid-tightly fitted onto the spool 9.

On the other hand, the front end side of the sleeve 11 is formed into a tapered part 14 via a flange part 13 so as to form a watertight abutting seal part all around the flare 15 formed at the pipe end 2 of the pipe 1. has been done.

16 is a sealing jaw, which is divided into two in the circumferential direction, contacts the 7-lead 15 of the tube 1 from the outside, and connects the 7-run 9 section 1
3 is removably fastened via bolts 8, and the flare 15 is pressed and tightened to the tapered portion 14 of the seal portion.

<Embodiment - Effect> In the above-mentioned configuration, the tube end 2 of the tube 1 is formed into a tapered 7-reare 15 that matches the tapered portion 14 of the seal portion of the sleeve 11 by an appropriate means, and this is formed in the draining state. The sleeve 11 slides onto the spool 9 in a watertight manner, and the sleeve 11 is brought into contact with the tapered portion 14 of the sleeve 11 from the outside. is fastened to the tapered portion 14 of the seal portion of the sleeve 11 in a watertight state all around.

Then, by pressing a start switch (not shown), a high pressure water pump is operated via a cut/repulp (also not shown), and high pressure water is fed into the supply/discharge cavity 10 of the spool 9 from the water inlet 6'.

Then, the fed high pressure water is supplied to the supply/discharge cavity 1 of the spool 9.
0 into the supply space 10' of the sleeve 11, through which it is fed into the tube 1 and subjected to a predetermined hydraulic test or hydraulic tube expansion.

7- Then, as the pressurized water pressure gradually increases, if the cross-sectional area of the pipe 1 is S and the cross-sectional area of the supply/discharge stop 10' of the sleeve 11 is 8, then Px (S -A)
The axial force acts on the sleeve 11 as a reaction force.

However, in the invention of this application, the sleeve 1
The annular cross-sectional area of the ring-shaped stepped portion 12 of the sleeve 11 in the liquid chamber 10 of the spool 9 of 1 is designed to be equal to the cross-sectional area of (SA) above, so that the supply/discharge cavity 10 The pushing force in the direction of the tube 1 at is substantially equal to the axial force and can be applied in the opposite direction, so that the sleeve 11 does not move laterally with respect to pressure.

Therefore, there is no possibility that a leak will occur due to the poor sealing of the seal portion of the sleeve 11 with respect to the seven-lead 15 of the tube 1.

On the other hand, as the water pressure inside the tube 1 increases, its diameter expands and becomes larger, and its axial length contracts accordingly.
Since the sealing jaw 16 is reliably clamped to the sleeve 11 via the bolt 8, the sleeve 11 slides inward and is drawn toward the pipe 1, and from that point as well, The seal becomes hot and no leaks occur.

Therefore, the water pressure test and the water pressure expansion of the pipe 1 are reliably performed.

During this time, the spool 0 and the supply v1 cavity 1 of the movable sleeve 11
A leak of 0.10' is reliably prevented by the seals 3', 3'.

When the prescribed work is completed, either switch the switching valve to drain the water from the water inlet 6', or remove the water pressure and remove the bolt 8, dissociate the seal 1G, and remove the sleeve 1.
Remove @1 from 1.

In this embodiment, by making the cross-sectional area of the stepped portion 12 larger than the above-mentioned cross-sectional area <5-A by the designed amount, the sleeve 11 can be moved to the pressure set in the direction of the pipe 1 during operation. It is also possible to positively guarantee the seal by leaving it in place.

Further, in this case, it is necessary to design the culm stone so that buckling deformation of the tube 1 does not occur.

As a design change, a hydraulic cylinder may be used for tightening the seal instead of using the bolt 8.

Various design changes are also possible, such as attaching the tube end hydraulic sealing device to one end of the tube and simply using a pressure sealing device at the other end.

Furthermore, in the embodiment shown in FIG. 3, the movable sleeve 11
A predetermined number of hydraulic cylinders 18, 18... are provided toward the outside of the frame 4', and the pistons are The tip of a rod 20 fixed to 19 and extending forward is fixed to a flange-shaped bracket 21 fixed to the movable sleeve 11', and a hydraulic circuit 22 from the hydraulic cylinder 18 is connected to a switching valve 23 and a hydraulic pump. In this embodiment, it is connected to a bolt 25 via a bolt 24.

In this embodiment, the end of the pipe 1 which is brought into contact with the end of the movable sleeve 11' through the packing 3 is connected to one cavity 10 which is supplied with pressurized water from the water inlet 6' of the spool 9, as in the above-mentioned embodiment. The supply 1 is introduced into the pipe 1 through the cavity 10', and the same operation as above) is carried out, but the sleeve against the pipe 1 is 11' is of course set and reset, and a follower fine pressure adjustment is performed, so that the sleeve 11' can be minutely advanced in response to the water pressure change V opening against the pipe 1.

In this embodiment, the supply and drainage cavity 10 in the sleeve 11'
It is also possible to change the design so that the pressure of the hydraulic cylinder is adjusted appropriately via an automatic adjustment device while detecting the water pressure of the cylinder.

<Sen's Embodiment> Note that the embodiments of the invention of this application are of course not limited to the above embodiments; for example, there are various embodiments in which the tie rod is used as a pole screw or the like to adjust the fastening. can be adopted.

<Effects of the Invention> As described above, the invention of this application basically supplies a high-pressure liquid into the pipe in a pipe end hydraulic sealing device used for hydraulic pressure tests and hydraulic pipe expansion. As a result, even if the limb canal expands in the radial direction and contracts in the axial direction, the sealing part is always tightly pressed and the seal is completed, so that the applied pressure fluid never leaks and the limb canal is closed. An excellent effect is obtained in that the hydraulic pressure does not change even if deformation occurs in the radial and axial directions.

Therefore, the accuracy will be good! Ij3i! An excellent effect is achieved in that the accuracy and control of the products being processed are well performed.

Therefore, the seal for the seal at the end of the tube is formed at the tip of the sleeve that can be inserted and slid against the spool fixed to the frame, so that the movable sleeve is always smooth against the expansion and contraction behavior of the tube. This has the excellent effect of keeping the seal against the end of the tube stable.

In addition, since the sleeve has a supply/discharge cavity in the cylinder and a pressure fluid supply/discharge cavity for the seal portion at the end of the tube, even though the movable sleeve slides in accordance with the expansion and contraction of the tube, The excellent effect of stably supplying pressure liquid is achieved.

12- Also, since the rod of the hydraulic cylinder is connected to the bracket of the sleeve, the setting and resetting of the pipe is not only carried out smoothly and reliably by the hydraulic cylinder, but also the rod of the hydraulic cylinder is connected to the bracket of the sleeve. Another advantageous effect is that the pressure can be adjusted by the hydraulic cylinder in the event that the sleeve changes in the course of supplying the liquid by following the flow of the sleeve.

The sleeve has a stepped portion in the cylinder, so that the cross-sectional area of the stepped portion can be made equal to or larger than the cross-sectional area of the tube in the axial direction of the tube during pressurization. Although the sleeve follows the deformation,
Since a large axial force is not applied to the sleeve, or rather no pressure is applied at all, or even a slight pressure can be applied, an excellent effect is achieved in that the seal is maintained more reliably.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a pipe end hydraulic sealing device based on the prior art, Fig. 2.3 is an explanatory view of an embodiment of the invention of this application, and Fig. 2 is a longitudinal cross-sectional view of one embodiment. , FIG. 3 is a longitudinal sectional view of another embodiment. 2... Pipe end, 17... Supply/discharge frame, 1
1.11'... Seal device body, plunger, 5...
・Tie rod, 4.4'...Frame, 9...Spool, 11.11'...Sleeve, 14...Seal part, , 12...Step part, 11...Pressure fluid supply and discharge Frame, 2o...Rod, 21...Bracket Applicant Kawasaki Heavy Industries Co., Ltd. Agent Tomi 1) Yukiharu 15-195- JP-A-59-208434 (6)

Claims (2)

[Claims] (1) In a pipe end hydraulic sealing device in which the sealing device main body having a pressure fluid supply/discharge frame and a pressure fluid supply/discharge frame is in pressure contact with the entire circumference of the pipe end and is installed on a frame fixed to a tie rod, a spool is fixed to the frame. A tube end seal portion is provided at the tip of a sleeve as a sealing device main body that is externally inserted onto the spool via a supply/discharge frame, and a ring-shaped stepped portion is provided inside the supply/discharge cavity of the sleeve. A pipe end hydraulic sealing device characterized in that a pressure fluid supply/discharge frame is formed in the spool and communicates with the sleeve and the seal portion. (2) In a pipe end hydraulic sealing device in which the sealing device main body having a pressurized liquid supply/discharge frame and which is in pressure contact with the entire circumference of the pipe end is provided on a frame fixed to a tie rod, the spool is fixed to the frame. , a tube end seal part is provided at the tip of the sleeve as the sealing device main body that is inserted onto the spool.
A ring-shaped stepped portion is provided inside the sleeve, and a pressurized fluid supply/discharge frame communicating with the sleeve and the seal portion is formed within the spool.
A pipe end hydraulic sealing device, characterized in that an nrad of a hydraulic cylinder provided on the frame is connected to a bracket provided on the sleeve.