JPH0637740U - Flange pipe joint pressure resistance tester - Google Patents

Abstract

(57) [Abstract] [Purpose] A pressure proof tester with a seal ring mechanism that occupies a small volume related to the test, has high durability, close contact force and high pressure resistance, and is capable of performing high pressure tests. We provide test equipment suitable for leak test and pressure resistance test. [Structure] An annular body 7 having a flange contact plate 7a at one end
A pressurizing type seal space portion 3 for partitioning the test space portion 1 of the joint between the flange facing plate and the outer peripheral surface of the
Is provided and the flange contact plate 7a and the flange surface are tightened and fixed in a sealed state, and the pressure type seal space portion 3 is easily expanded in the outer diameter direction but is not easily deformed in the lateral direction. A reinforcing movable seal ring 8 made of a rubber-like elastic body reinforced by a reinforcing cord 9 is inserted into the inner wall of the annular body 7, and an inlet port for introducing a pressurized fluid into the test space portion 1 and the pressurizing seal space portion 3 is provided in the peripheral wall portion of the annular body 7. The configuration provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure resistance test device for a joint part capable of performing a pressure resistance test only at a local portion of the joint part, and more particularly to a pressure resistance test device for the joint part of a flange pipe in which a flange is joined to a pipe body. Is.

[0002]

[Prior art]

 Conventionally, in pipes and storage tanks, pipes having circular cross sections or pipes and flanges have been joined by various joining means such as welding, screwing, and bonding. If these joints are incomplete, water leakage will occur and the strength will be reduced.For equipment with joints, not only piping and storage tanks, but also leak tests and pressure tests are performed to check for leaks. There is a need.

Many devices having a joint to be tested have a large internal volume, and large devices are important as test targets, and all devices are targets. As a test method, for example, all of the open ports of the equipment are closed with a blind cover, and a gas or liquid is filled inside to perform a leak test and a pressure test.

In this case, it takes a long time to fill and discharge the fluid, and there is a waste of discharging and discarding compressed air or water. Also, if water is used, it may cause rust depending on the material, causing rust to occur over the entire volume and wasting a lot of construction cost for its removal and cleaning. In addition, equipment that handles anaerobic materials must be completely dried.

[0005] Incidentally, in devices that use gas, an airtight test is necessary, but when the test pressure is high, a large capacity is accompanied by a danger, and therefore the watertight test is unavoidable in many cases. However, it is not a complete test because it may leak in gas even if it does not leak in water. Therefore, if one tries to perform a high-pressure airtight test on large-capacity equipment, most of the volume will be filled with liquid, and gas will be used for a part of the joint necessary to confirm a leak. .

In this case, there is a difference in specific gravity between the gas and the liquid, and it is not easy to seal the gas only in a necessary small portion. Also, even when conducting a water tightness test, it is difficult to completely replace the atmosphere inside with a liquid.

Even in the case of a leak test of a large-capacity device, a method of limiting it to a very limited part of the joint, that is, the large volume of the large-capacity device is opened at atmospheric pressure In order to test the limited part of the joint to be tested in the state, it is necessary to form a small-volume test space part for enclosing the pressurized fluid for the test in the limited part. is there. In addition, a sealing mechanism is needed to seal this limited test space. In this case, since the inner diameter of the pipe body has a considerably large dimensional tolerance, a sealing mechanism corresponding to the dimensional tolerance is required. Also, a seal mechanism that can obtain a sufficient pressure resistance test is required.

An example of a test device for a joint between pipes is disclosed in Japanese Utility Model Publication No. 54-42955, Japanese Utility Model Publication No. 48-24775, and the like.

[0009]

[Problems to be solved by the device]

 However, as described in Japanese Utility Model Publication No. 54-42955, in the method of adopting the packing type sealing mechanism consisting only of the rubber-like elastic body, the pressure contact surface undergoes plastic deformation and a high pressure contact force cannot be obtained. Furthermore, as shown in the above publication, when a ring-shaped collar is provided to suppress expansion, a higher sealability cannot be obtained.

Further, as described in Japanese Utility Model Publication No. 48-24775, a seal material having a circular cross-section body obtained by subjecting a woven fabric to a rubber treatment is used to obtain a constant inflation like an air bag. It is a non-expansion restraint system that seals by linear contact by reinforcement so that it does not expand beyond a certain size, and it is relatively free to deform when lateral stress is applied. However, a strong increase in sealing performance cannot be expected.

In addition, the seal system composed only of a rubber-like elastic body cannot obtain a high degree of pressure resistance due to the characteristics of the rubber-based viscoelastic body. That is, as a characteristic of a viscoelastic body, under a constant stress, it appears as a deformation or a creep added to the initial elastic deformation with the passage of time, and a free state portion is subjected to a constant stress. It gradually sustains a slow permanent deformation, and appears as stress attenuation at the contact surface. Therefore, when using a rubber-based material as a sealant, it is necessary to take into account the characteristics of the rubber-based viscoelastic body that causes such creep phenomenon and stress attenuation, and an appropriate reinforcement structure is required.

Further, all of the above-mentioned conventional examples disclose a leak test and a pressure resistance test apparatus at a joint portion between pipe bodies, and a leak test at the joint portion of a flange pipe to which a flange is joined, No suitable test equipment has been provided so far for the withstand voltage test.

Therefore, an object of the present invention is to provide a structure that occupies a small volume related to a test, is safe, and is simple and quick in the test. In the seal ring mechanism, a rubber-like elastic material with good creepability is used as a sealing material, and its durability and close contact force and pressure resistance are increased to enable high-pressure testing, and a flange pipe that has not been provided in the past. We are providing the optimum test equipment for the leak test and pressure resistance test of the joint part.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, the inventors first developed a reinforced movable seal ring as a seal mechanism adapted to a rubber-based viscoelastic body and capable of always maintaining a strong sealing property. The reinforced movable seal ring is inserted into the pressurization type seal space part formed in the shape of a groove by the ridge on the outer peripheral surface, and the pressurized fluid is introduced from the lower part to exert a strong sealing property.

The reinforced movable seal ring is a ring made of a rubber-like elastic material and having a square cross section. The ring has a seal lip on the inner diameter side, and a pressure contact is made inside the outer circumferential portion of the ring. This is to reinforce the body so that the pressure contact force is fully actuated and the operation of the seal ring is not suppressed.

That is, the reinforced movable seal ring of the present invention is different from the reinforced structure such as woven fabric that suppresses the overall variation by the vertical-horizontal linkage structure, and the reinforcement cord such as a tire cord is used as the seal ring. Inside the outer diameter circumferential portion, the cords are oriented laterally, and independent cords are juxtaposed in parallel to reinforce the cords.

Therefore, when a pressure fluid is introduced into the pressurizing type seal space, the rubber between the cords easily extends in the outer diameter direction like an accordion without being restrained by the cords, and a strong pressure contact force acts. If the portion that protrudes from the groove-shaped seal space under pressure is made of only a rubber-like elastic body, rubber is a viscoelastic body, so plastic deformation easily occurs, and the deformation increases over time. Although it cannot support high pressure, the above-mentioned reinforced movable seal ring has a special reinforcement structure and exerts a strong lateral deformation preventing force on the sealing surface. Therefore, the force in the outer diameter direction of the rubber surface is increased and a strong pressure resistance is obtained.

A pressure resistance test apparatus for performing a pressure resistance test on a joint between a pipe body and a flange using such a reinforced movable seal ring is configured as follows.

That is, in a pressure resistance test apparatus for a joint portion of a flange pipe in which a flange is joined to a pipe body, a groove shape is formed by a pair of projecting edges on an outer peripheral surface of an annular body having a flange contact plate at one end. A pressure seal space is formed on the flange facing plate to separate the test space of the joint, and is fixed in the seal groove of the flange facing plate. The pressurizing seal space part has seal lips on both inner and inner diameter sides of the ring made of rubber-like elastic material and has a square cross section. Is a reinforcing movable seal ring that is reinforced by embedding independent reinforcing cords in parallel in the width direction and expanding easily in the outer diameter direction but not easily deforming in the lateral direction. It is a pressure resistance tester for flange pipe joints that is equipped with an inlet for introducing pressurized fluid into the test space and pressure seal space on the peripheral wall of the annular body.

[0020]

[Action]

 Therefore, this pressure resistance test device can be fixed between the flange of the pipe and the flange contact plate while obtaining a hermetically sealed state by the fixed seal ring, and the pressure type seal space portion separately provided on the outer peripheral surface of the annular body and the above-mentioned A test space part of the joint is divided between the seal ring and the seal ring.If a pressurized fluid is introduced into the pressurization type seal space part to obtain a pressure contact seal state between the reinforced movable seal ring and the inner surface of the pipe, it will be sealed. It is possible to form a test space section that is divided into states, and by introducing the required pressure fluid into this test space section, it is possible to perform a desired pressure resistance test of the joint between the flange and the pipe.

As the reinforced movable seal ring, a ring having a rectangular cross section of a rubber-like elastic body is used, and the reinforced movable seal ring is provided with a special reinforced structure, so that it freely expands in the outer diameter direction. However, since lateral deformation is suppressed on the seal surface having a square cross section, plastic deformation on the pressure contact surface is prevented, and a decrease in pressure contact force can be prevented. In addition, the creep phenomenon and stress attenuation observed in the rubber-like elastic body are suppressed to ensure stable and reliable high-pressure sealability, and lateral deformation is suppressed, so that the force in the outer radial direction is reduced. Increased and stronger sealing pressure is obtained. Therefore, even if the test pressure applied from the lateral direction is increased, there is no risk of deformation and leakage, and high-pressure withstanding test can be performed.

Further, since the movable seal ring is prevented from being deformed in the lateral direction, it easily returns to the space between the projecting edges after the end of the pressure resistance test, so that there is no problem in removing the device and repeated use. Suitable for

[0023] Not only can the moth theory test space be made extremely small, but the loss of time and fluid is extremely small, and tests can be performed easily, quickly, and inexpensively, and compressed gas can be used freely. , A safe leak or pressure test is performed and the safety of the test is ensured.

[0024]

【Example】

 Hereinafter, an example of implementation of a pressure resistance test device for a flange pipe joint according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a withstand pressure test apparatus TE of the joint portion 11 of the flange pipe in which the flange 12 is welded to the pipe body 10 in its used state. The test apparatus TE has a flange contact plate 7a at one end of an annular body 7 having an inner diameter d and an outer diameter D. A circular seal groove 13 is formed in the flange contact plate 7a, and a fixed seal ring 14 inserted in this groove is pressed against the flange 12 and is tightened and fixed by a fastener 15 such as a bolt.

A pressurizing seal space, which is formed in a groove shape by a pair of projecting edges 5 and 6 on the outer peripheral surface of the annular body 7, and which defines the test space portion 1 of the joint portion 11 with the flange contact plate 7 a. A section 3 is provided. Reference numeral 8 is a reinforced movable seal ring made of a rubber-like elastic body made of an elastic polymer such as rubber or plastic, which is inserted into the pressurizing seal space portion 3. The seal lips 8a are provided on both inner diameter sides of the ring having a square cross section. Inside the circumferential portion of the ring in the radial direction, the reinforcing cords 9 are independently embedded in parallel in the width direction, and expand easily in the radial direction. It is reinforced so that it is not easily deformed in the lateral direction.

Reference numeral 2 is a test pressurized fluid inlet provided in the annular body 4, and 4 is a sealing pressurized fluid inlet. The pressurized fluid is introduced into the pressurized seal space portion 3 to reinforce the movable seal ring. When the pressure contact sealing state between the seal surface 8b of 8 and the inner surface of the tube body 10 is obtained, the test space portion 1 partitioned into a sealed state can be formed. Therefore, if a required pressure fluid is introduced into the test space portion 1, it is possible to perform a leak and pressure resistance test at the joint portion between the flange and the pipe.

This example shows an example in which the tubular body 10 has an annular shape. However, in the case of an elliptical shape and other deformations, the shape is similar to that of the annular body 7 of this device. Can be implemented in

It is also possible to adopt a configuration in which a pressure type seal space portion can be used instead of the fixed seal ring.

FIG. 2 is an enlarged cross-sectional view showing the cross-sectional shape of the reinforced movable seal ring 8 , and this reinforced movable seal ring made of a rubber-like elastic body is self-sealing on both sides on the inner diameter side as shown in the figure. The seal lips 8a for use in the tire are formed on both sides, and an independent reinforcing cord 9 such as a non-woven tire cord is provided inside the outer circumferential portion of the seal ring in the width direction. Independently, they are reinforced by embedding them in parallel.

That is, the independent reinforcing cords 9 are connected only by the rubber-like elastic body and have freedom, but in the lateral direction, extension is prevented by embedding the cords. Further, the plastic deformation in the lateral direction of the rubber-like elastic body, which is a viscoelastic body, is prevented, so that the durability is also increased. By reinforcing in this way, the reinforced movable seal ring 8 can be freely expanded in the outer diameter direction like an accordion by pressure, but the strength in the width direction (axial direction) is increased and the lateral direction is increased. Can be strongly supported against deformation, and the increased pressure in the pressure-type seal space part 3 causes a stronger pressure contact force to the DUT, but the rubber-like elasticity of the seal part. The body can maintain a strong sealing function to prevent lateral pressure due to the test pressure, thus enabling a high pressure resistance test.

The reinforcing movable seal ring 8 can form a higher pressure contact surface with the pressure contact surface by forming a groove on the outer peripheral seal surface according to the state of the pressure contact surface. Since it is strongly pressed against a wide pressure contact surface, high pressure is maintained in combination with the reinforcing structure.

FIG. 3 is a partially enlarged cross-sectional view of FIG. 1. When the reinforcing movable seal ring 8 is inserted into the pressurizing seal space portion 3, the seal lip 8 a is formed by the outer ridge 5 and the inner ridge 6. Although it is pushed in and a contact pressure is generated between both walls, when the pressurized fluid is further pressed from the pressurized fluid inlet 4 for the seal, the reinforcing movable seal ring 8 moves in the outer diameter direction. Since it expands freely and has the function of preventing deformation in the axial direction, the angular sealing surface 8b strongly contacts the inner surface of the circular body of the object to be measured and exhibits sealing performance, as well as the sealing lip. 8a is a pressure of the pressurized fluid itself, which is strongly pressed against the wall surfaces of both projecting edges, thereby exerting stronger self-sealing.

That is, this pressurizing type seal system can freely exert the seal function regardless of the dimensional tolerance, and further, the seal function can be freely changed by the pressurization, so that the contact surface can be changed. Not only is it capable of responding to changes in the state of, but also provides reliable and stable sealing performance.

[0035]

[Effect of device]

 As described above, the present invention has been able to provide a pressure resistance test device for flange pipe joints that has not been seen in the past, and not only can the test space be minimized, but it also has a sealing function between the inner surface of the pipe and the inside. Reinforcement of the pressurization type seal space part that exerts the effect that the movable seal ring has a reinforcement structure that expands easily in the outer diameter direction but does not deform easily in the lateral direction, so it is effective and stable against the inner surface of the pipe. In addition, a reliable and reliable pressure contact force can be obtained, and good sealing performance can be secured.High-pressure testing, which cannot be obtained with the conventional configuration, can be easily performed, and complete testing can be performed easily and inexpensively. Moreover, it has a feature that the test is simple, quick, and safe.

Further, since the movable seal ring is prevented from being deformed in the lateral direction, it easily returns to between the projecting edges after the end of the pressure resistance test, so that there is no problem in removing the device and repeated use. It was also suitable for this, and could provide a testing device with high practicality and reliability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a pressure resistance test apparatus according to the present invention in use,

FIG. 2 is an enlarged cross-sectional view of a reinforced movable seal ring used in the device.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Test space part 2 ... Test pressurizing fluid introduction port 3 ... Pressurization type seal space part 4 ... Sealing pressurizing fluid introduction port 5, 6 ... Projection edge 7 ... Annular body 7a ... Flange contact plate 8 ... Reinforcement movable Seal ring 8a ... Seal lip
8b ... Seal surface 9 ... Reinforcement cord 10 ... Tube 11 ... Joint part 1
2 ... Flange 13 ... Seal groove 14 ... Fixed seal ring 15 ...
Fastener TE ... Withstand pressure tester

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Totsuyo Ochi 5-8-4 Satakedai, Suita City, Osaka Prefecture (72) Nobuo Nishimura 5-2-22 Sakuraguchi-cho, Nada-ku, Kobe City, Hyogo Prefecture

Claims (1)

[Scope of utility model registration request] 1. A pressure resistance test apparatus for a joint portion of a flange pipe in which a flange 12 is joined to a pipe body 10, wherein a pair of projecting edges 5 are provided on an outer peripheral surface of an annular body 7 having a flange contact plate 7a at one end. , 6 in the shape of a groove, which defines a test space portion 1 of the joint between the flange contact plate and the flange contact plate, and a flange contact plate 7
The fixed seal ring 14 is attached to the seal groove of a and can be tightened and fixed to the flange surface with a fastener, and the pressurization type seal space portion 3 has a rectangular cross-section made of a rubber-like elastic body on the inner diameter side. The seal lips 8a are provided on both sides, and the reinforcing cords 9 are embedded in parallel in the outer circumferential portion of the ring in the width direction, and the reinforcing cords 9 are easily embedded in the outer diameter direction. The reinforcing movable seal ring 8 is reinforced so that it expands but is not easily deformed in the lateral direction, and the pressurized fluid is introduced into the test space portion 1 and the pressurizing seal space portion 3 in the peripheral wall portion of the annular body 7. Pressure resistance tester for flange pipe joints that is equipped with an inlet.