JPH09105699A - Sealability inspecting apparatus for tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealability inspecting apparatus for tube joint which makes it possible to simplify the structure and to lighten the weight. SOLUTION: Expansive fluid 34 is introduced into first and second elastic tubes 35, 37 to be expanded. The structure that first and second sealing members 36, 38 are extended along the tapered surfaces 38a, 38a of a cylindrical element 33 and brought into pressure contact with the inner peripheral surfaces of the tubes 2, 4 is formed. As a result, the structure can be simplified as a sealability inspecting apparatus 30 while maintaining the testing performance in the sealability inspection high, thereby making it possible to improve the operating efficiency such as to lighten the weight and to conduct the moving operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint such as a cast iron pipe or an iron pipe used for a sewage pressure-feeding pipe, which is joined in a state where the pipe joint is well sealed and hermetically sealed. The present invention relates to an apparatus for inspecting the tightness of pipe joints used for checking whether or not the pipe joints have been checked.

[0002]

2. Description of the Related Art For example, in a ductile cast iron pipe used for supplying clean water, at the time of completion inspection of the pipeline, the cleanliness of the pipe joint is inspected by actually supplying clean water to the pipeline to apply water pressure. Is done. However, in the sewage pumping pipeline, there is no source of tap water, it is difficult to secure the amount of sewage that can fill the entire pipeline at the time of completion, or only the sewage pumping pump is sufficient for the sealing test. Since it is difficult to secure a sufficient water pressure, there are many difficulties in conducting the sealability inspection of the joint part.

As a pipe joint sealability inspection device that solves these problems, those shown in FIGS. 3 and 4 have been proposed. First, before describing the hermeticity inspection device 10, a pipe joint 1 using the hermeticity inspection device 10 will be described with reference to FIG. 3, and a receptacle 3 formed at an end of one pipe 2 will be described. On the inner circumference, a tapered seal material pressure contact surface 3a is formed on the opening end side, and an insertion port accommodation portion 3b is formed on the inner side. Further, the insertion port 5 formed at the end of the other tube 4 is inserted into the inside of the receiving port 3, and between the sealing material pressure contact surface 3 a of the receiving port 3 and the outer peripheral surface of the insertion port 5, an annular shape is formed. The sealing material 6 is arranged. A push ring 7 is fitted in the insertion slot 5, and the push ring 7 is fastened to the flange 9 at the opening end of the receiving slot 3 by the T-head bolt 8, so that the sealing material 6 is compressed by the push ring 7 and compared. It exhibits a predetermined sealing function that can withstand extremely high pressure.

As shown in FIG. 3, the hermeticity inspection device 10
Are first and second push ring bodies 11 and 12 arranged to form a pair in the axial direction of the pipes 2 and 4 joined by the pipe joint 1, and these first and second push ring bodies 11 , 12
Between the first pressing ring 11 and the interior member 13, the interior member 13 disposed between the first inner ring 13 and the inner ring 13 is made of rubber and is annular. The seal member 14, and the rubber-made annular second seal member 15 which is arranged between the second push ring body 12 and the interior member 13 so as to face the inner peripheral surface of the other tube 4. A center-hole type hydraulic jack 16 for moving the first push ring body 11 and the second push ring body 12 toward and away from each other along the tube axis direction.
And a test fluid supply pipe 21 which is connected to a test fluid supply means (not shown) at the base and supplies a test fluid 23 (see FIG. 4) such as air or nitrogen gas.

Further, a first member is provided on both side surfaces of the peripheral portion of the interior member 13.
And vertical pressing surfaces 13a and 13b for vertically pressing the second seal members 14 and 15 toward the tube axis direction are formed, and the outer peripheral surfaces of the first and second push ring bodies 11 and 12 are provided with outer surfaces. Tapered surfaces 11a and 12a that are inclined in the direction are formed. Correspondingly, vertical pressing surfaces 14a and 15a that are perpendicular to the tube axis direction are formed in the first and second seal members 14 and 15 in contact with the interior member 13. The first and second push ring bodies 11 in the first and second seal members 14 and 15,
Tapered surfaces 14b and 15b are formed in a portion in contact with 12 so as to be inclined obliquely toward the inner peripheral direction.

Further, a center-hole type hydraulic jack 1
Support rod 1 projecting from 6 and arranged at the axial center of the pipe
The first push ring body 11, the interior member 13, and the second push ring body 12 are slidably pierced and supported by the 6a, and a retractable piston 16c retracted from the main body portion 16b of the hydraulic jack 16 is used. The second push ring 12 is pressed from the side surface along the tube axis direction. In addition, 1
Reference numeral 6d is a hydraulic oil supply path for supplying hydraulic oil as a fluid for inspection of the hydraulic jack 16.

In the case of performing the sealing test, the push-out piston 16c of the hydraulic jack 16 is made to project from the state shown in FIG. 3, and the first push ring body 11, the interior member 13, and the second push ring body 12 are connected. Bring them closer to each other. As a result, the first seal member 14 is pressed by the vertical pressing surface 13a of the interior member 13, expands in diameter along the tapered surface 11a of the first push ring body 11, and the inner peripheral surface of the one pipe 2 is pressed. Is pressed against. Similarly, the second seal member 15 is pressed by the vertical pressing surface 13b of the interior member 13, expands in diameter along the tapered surface 12a of the second pressing ring body 12, and then the inner peripheral surface of the other tube 4 is pressed. Is pressed against.

After this, the pipe joint 1 and the seal members 14, 15
A test fluid 23 is supplied from a test fluid supply pipe 21 having a distal end connected to the space 22 to the space 22 formed by the interior member 13 and the test fluid pressure is applied to the pipe joint 1 Check if there is any leakage from the outside (for example, apply soapy water etc. to the outside of the pipe fitting 1 beforehand,
The airtightness can be checked by confirming whether or not air bubbles are generated.

Particularly, according to the hermeticity inspection device 10,
The driving force along the tube axis direction of the hydraulic jack 16 is directly transmitted from the vertical pressing surfaces 13a and 13b to the seal members 14 and 15, and each seal member 14 and 15 has a single tapered surface 1.
Since the pressure is applied to the inner peripheral surfaces of the pipes 2 and 4 while expanding the diameters by 1a and 12a, the surface pressure of the pressure contact portions by the seal members 14 and 15 can be increased, and there is a possibility of being used even for high pressure. It is possible to perform an airtightness test on a certain pipe joint 1 or the like under a high pressure load.

[0010]

However, in the above-described conventional pipe joint sealability inspection device 10, the first push ring body 11, the interior member 13, and the second member such as the hydraulic jack 16 are provided.
Means for moving the push ring body 12 of the pipe joint 1 away from each other, and the sealing tester 10 having the approaching and separating means is attached to the pipe joint 1
Since the structure is to be transferred up to the point, there is a problem that the structure of the hermeticity inspection device 10 becomes relatively complicated and heavy, and the transfer work becomes heavy labor.

The present invention solves the above problems, and an object of the present invention is to provide a pipe joint sealability inspection device which can be simplified in structure and can be reduced in weight.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a hermeticity of a pipe joint for inspecting a fluid leak from the inside to the outside in a pipe joint for joining one pipe and the other pipe. An inspection device, which is arranged so as to face each other from the inner peripheral surface of one pipe to the inner peripheral surface of the other pipe inside the pipe joint, and has first and second annular recesses each having an obliquely outward taper surface. And a first elastic tube that is housed in the first annular recess of the tubular body and expands when the inflation fluid is injected, and the first annular recess of the tubular body. In the above, an annular first seal member, which is housed in contact with the tapered surface and is arranged in a posture facing the inner peripheral surface of one of the tubes, and a second annular recess of the tubular body, A second elastic tube that expands when injected with
An annular second seal member that is housed in contact with the tapered surface in the second annular recess of the tubular body and is arranged in a posture facing the inner peripheral surface of the other tube, and first and second elastic members. By supplying the expansion fluid to the tube to expand it, the diameter of the first seal member is expanded along the tapered surface and brought into pressure contact with the inner peripheral surface of one of the tubes, and the second seal member is expanded along the tapered surface. The expansion fluid supply path that expands the diameter and press-contacts the inner peripheral surface of the other pipe, and the inspection fluid in the space formed by pressing the first and second sealing members to the inner peripheral surface of the tube. And an inspection fluid supply path for supplying the inspection fluid.

According to the above construction, by injecting the expansion fluid into the first and second elastic tubes and expanding them, the seal member is expanded and brought into pressure contact with the inner peripheral surface of the tube. Since it is not necessary to attach a conventional hydraulic cylinder or the like, the structure of the airtightness inspection device can be simplified and the weight can be reduced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The components having the same functions as those of the related art are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 1, the hermeticity inspection device 30.
Are arranged inside the pipe joint 1 so as to face each other from the inner peripheral surface of the one pipe 2 to the inner peripheral surface of the other pipe 4, and have first and second tapered surfaces 31a, 32a that are inclined outward. By accommodating the tubular body 33 in which the annular recesses 31 and 32 are formed and the first annular recess 31 of the tubular body 33 and injecting the expansion fluid 34 (see FIG. 2) such as nitrogen gas, The inflating annular first elastic tube 35 and the tapered surface 31a and the first annular recess 31 of the tubular body 33
The first annular sealing member 36, which is housed in contact with the elastic tube 35 and is arranged in a posture facing the inner peripheral surface of the one tube 2, and the second annular recess 32 of the tubular body 33. The second elastic tube 37, which expands when the expansion fluid 34 is injected, and the second annular recess 32 of the tubular body 33, which is in contact with the tapered surface 32a and the second elastic tube 37, are housed. The expansion fluid 3 is attached to the annular second seal member 38 and the first and second elastic tubes 35 and 37 which are arranged so as to face the inner peripheral surface of the other tube 4.
The fluid 22 for expansion for supplying 4 and the space 22 formed by pressing the first and second seal members 36 and 38 against the inner peripheral surfaces of the pipes 2 and 4 are used to inspect water or nitrogen gas. And a test fluid supply path 21 for supplying a working fluid 23 (see FIG. 2). Here, the expansion fluid supply path 39 is connected to the expansion fluid supply means (not shown) at the base, and the first and second elastic tubes 35, 3 at the tip.
7 are connected in parallel.

More specifically, the tubular body 33 is
It is arranged so as to face the inner peripheral surface of one tube 2,
A first tubular portion 41 provided with a first annular recess 31;
It is arranged so as to face the inner peripheral surface of the other pipe 4,
A second tubular portion 42 having a second annular recess 32,
It is composed of a connecting tubular portion 43 arranged between the first tubular portion 41 and the second tubular portion 42 and integrally fixing the tubular portions 41, 42.

The above-described tapered surfaces 31a and 32a are formed in the first annular concave portion 31 and the second annular concave portion 32 at positions near the connecting tubular portion 43, and the first and second annular concave portions are formed. Tapered surfaces 31 and 32
Vertical surfaces 31b and 32b that are perpendicular to the tube axis are formed on the side facing a and 32a. In addition, the first
Also in the second seal members 36 and 38, the tapered surfaces 36a and 38a are formed at the portions of the first and second annular recesses 31 and 32 that come into contact with the tapered surfaces 31a and 32a, respectively. Vertical surfaces 36b and 38b are formed on the side surface opposite to 38a.

Furthermore, the first and second annular recesses 31, 32
From the vertical surfaces 31b, 32b to the bottom surface of
The second elastic tubes 35, 37 are brought into contact with each other, and the first, second
The vertical surfaces 36b, 38 of the first and second seal members 36, 38 on the remaining side surfaces of the elastic tubes 35, 37 of
b.

The tapered surfaces 31a, 32 of the cylindrical body 33 are
a and the tapered surfaces 36 of the first and second sealing members 36 and 38
The inclination angles of a and 38a are, for example, about 3 with respect to the tube axis direction.
The angle is set to 6 degrees.

In the case of performing the sealability inspection, the sealability inspection device 30 is inserted into the pipe in the posture shown in FIG. 1 and moved to the position of the pipe joint 1 to be inspected. In this case, since the hermeticity inspection device 30 has a structure that does not have a hydraulic cylinder or the like as in the related art, the structure of the hermeticity inspection device 30 is simplified and reduced in weight. Therefore, the work of moving the sealability inspection device 30 to the inspection location can be performed more easily than in the conventional case, and it does not require heavy labor as in the conventional case.

Next, in the state shown in FIG. 1, the expansion fluid 34 is supplied from the expansion fluid supply path 39 into the first and second elastic tubes 35 and 37 to apply a fluid pressure to the first and second elastic tubes 35 and 37 to apply the fluid pressure. The second elastic tubes 35, 37 are expanded. As a result, the first and second sealing members 36 and 38 are
The elastic tubes 35 and 37 are pressed toward the tapered surfaces 31a and 32a of the tubular body 33, and the diameter is increased along these tapered surfaces 31a and 32a, while the inner surfaces of the tubes 2 and 4 are high. Press with pressure.

Thereafter, the inspection fluid 23 is supplied from the inspection fluid supply pipe 21 to the space 22 formed by the pipe joint 1, the first and second seal members 36 and 38, and the tubular body 33. , Check the presence or absence of leakage from the outside of the pipe joint 1 by applying the inspection fluid pressure (for example, apply soap water or the like to the outside of the pipe joint 1 in advance and check if bubbles are generated).
Therefore, the hermeticity test is performed.

In this case, as described above, the first and second
Since the seal members 36 and 38 increase the surface pressure of the pressure contact portions of the pipes 2 and 4 with respect to the inner peripheral surfaces of the pipes 2 and 4 to improve the sealing property, it is possible to increase the inspection fluid pressure and perform the test in the hermeticity inspection. Performance will be high.

According to the tightness inspection, the pipe 1 is satisfactorily pipe 2,
When it is confirmed that the four members are connected to each other, the sealability inspection device 30 is removed from the inside of the duct by performing the procedure reverse to the above. Also in this case, since the structure of the airtightness inspection device 30 is simplified and the weight is reduced, the moving work can be performed more easily than in the conventional case.

As the expansion fluid 34 and the inspection fluid 23, one kind of fluid such as nitrogen gas may be shared as described above, and in this case, only one fluid supply means is required. It is possible, and there is an advantage that the equipment scale can be small. However, the present invention is not limited to this, and it goes without saying that different fluids may be used. Further, the pressurizing force of the expansion fluid 34 and the inspection fluid 23 may be set so as to be suitable for each case, and further, the expansion fluid 34 and the inspection fluid 2
3 is not limited to nitrogen gas, and water or air may be used.

In the above embodiment, the tubular body 33 is connected to the first tubular portion 41, the second tubular portion 42, and the tubular portions 41, 42 integrally fixed to each other. Tubular part 4
Although the case where it is integrally formed from 3 and 3 is described, the invention is not limited to this. Further, it goes without saying that the present invention can be applied to pipe joints other than the pipe joint 1 described above.

[0027]

As described above, according to the pipe joint hermeticity inspection device of the present invention, the expansion fluid is injected into the first and second elastic tubes for expansion, and the sealing member is caused to follow the tapered surface. By pushing and expanding it to press it against the inner peripheral surface of the pipe, it is possible to simplify the structure as a sealability inspection device while maintaining high performance in the sealability inspection test performance.
The weight can be reduced, and the work efficiency can be improved such that the moving work can be performed more easily than in the conventional case.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pipe joint hermeticity inspection device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same hermeticity inspection device during inspection.

FIG. 3 is a cross-sectional view of a conventional pipe joint sealability inspection device.

FIG. 4 is a cross-sectional view at the time of inspection in the conventional pipe joint sealability inspection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 2, 4 Pipe 3 Receptacle 5 Insertion port 6 Sealing material 21 Inspection fluid supply path 22 Space 23 Inspection fluid 30 Sealability inspection device 31 First annular recess 31a, 32a Tapered surface 31b, 32b Vertical surface 32 2nd annular recessed part 33 Cylindrical body 34 Expansion fluid 35 1st elastic tube 36 1st sealing member 36a, 38a Tapered surface 36b, 38b Vertical surface 37 2nd elastic tube 38 2nd sealing member 39 Expansion Fluid supply path 41 First tubular portion 42 Second tubular portion 43 Connection tubular portion

Claims (1)

[Claims] 1. A hermeticity inspection device for a pipe joint, which inspects leakage of fluid from the inside to the outside of a pipe joint for joining one pipe and another pipe, wherein A tubular body having first and second annular recesses formed so as to face each other from the inner circumferential surface to the inner circumferential surface of the other tube and having obliquely outward taper surfaces, and a first tubular body of the tubular body. A first elastic tube which is housed in the first annular recess and expands when the inflation fluid is injected, and an inner circumference of one tube which is housed in contact with the tapered surface in the first annular recess of the tubular body. An annular first seal member arranged in a posture facing the surface, a second elastic tube housed in a second annular recess of the tubular body and inflated by injecting an inflation fluid,
An annular second seal member that is housed in contact with the tapered surface in the second annular recess of the tubular body and is arranged in a posture facing the inner peripheral surface of the other tube, and first and second elastic members. By supplying the expansion fluid to the tube to expand it, the diameter of the first seal member is expanded along the tapered surface and brought into pressure contact with the inner peripheral surface of one of the tubes, and the second seal member is expanded along the tapered surface. The expansion fluid supply path that expands the diameter and press-contacts the inner peripheral surface of the other pipe, and the inspection fluid in the space formed by pressing the first and second sealing members to the inner peripheral surface of the tube. A pipe joint sealability inspection device, comprising: an inspection fluid supply path to be supplied.