JPH0545957Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a blind cap device that closes the end face of a pipe using a flange attached to the end of the pipe, which is used during airtightness and pressure resistance tests of the pipe. It is something.

[Conventional technology]

Airtightness and pressure resistance tests of various types of piping used in petrochemical plants, pipelines, etc. are performed by applying a blind cover to the end surface of the pipe body.

Figures 5 and 6 are for example Utility Model No. 58-153343.
This figure shows a conventional blind lid device for pressure-tightness and airtightness testing disclosed in the above publication, and numeral 31 is a blind lid disposed on the end surface of the tube body 1, and numeral 32 is formed at a portion of the blind lid 31 that faces the tube body. an annular groove into which the end face of the tube body 1 is fitted; 3;
3 is a gasket disposed within this annular groove 32. Reference numeral 34 designates a plurality of flanges fitted onto the outer peripheral surface of the end portion of the tube body 1, and includes a pair of circular arc plates 35a, 35b that abut against the outer peripheral surface of the tube body 1, and a flange welded onto the circular arc plates 35a, 35b. Standing board 36
a, 36b, and support pieces 37a, 37b welded to both ends of each arcuate plate 35a, 35b and rising plate 36a, 36b, and are connected to each other by a bolt 38 and a nut 39.

Reference numeral 40 denotes a through bolt inserted into an insertion hole formed in the outer periphery of the upright plates 36a, 36b and the blind lid 31, and 41 denotes a tightening nut that is screwed into the through bolt 40 and press-fitted to the blind lid 31. be.

Next, the operation during a pressure test using this device will be explained.

First, the flange 34 is disposed on the outer peripheral surface of the end of the tube 1, and the support pieces 37a and 37b are connected to each other by bolts 38 and nuts 39, and the flange 34 is attached to the tube 1.

Next, insert a gasket 33 into the annular groove 32 of the blind lid 31.
After inserting the annular groove 32 into the end surface of the tube body 1, each through bolt 40 is inserted into the rising plate 36.
a, 36b and the blind lid 31, and a tightening nut 41 is screwed onto the through bolt 40, and each tightening nut 41 is pressed against the blind lid 31.

This pressure contact brings the gasket 33 into pressure contact with the end surface of the tube body 1, thereby maintaining airtightness.

[Problem that the invention attempts to solve]

However, since the conventional blind lid device is configured as described above, a thrust force is transmitted to the end face side of the tube body through the blind lid and the through bolt due to the internal pressure generated inside the tube body. The fastening material of the flange must be firmly tightened so that the above-mentioned flange does not slide and the surface pressure can be maintained at the current level, and the tightening nuts that press the blind cover are all tightened evenly. Otherwise, leakage will occur from the annular groove through the gasket, making it impossible to perform a normal pressure test.

Furthermore, this device cannot be used for pipes with different diameters;
This created the problem of having to manufacture and manage a wide variety of devices.

This idea was created to solve the problems mentioned above. It can be easily attached to the end surface of a pipe by using a flange attached to the end of the pipe, and it can also be used for pipes with different diameters. The purpose is to obtain a blind lid device that can be used.

[Means for solving problems]

The blind lid device according to this invention includes a blind lid body that is larger in diameter than the flange attached to the end of the tube, a piston disposed in the center of the blind lid body, and a connection to one side of the piston. an arm fixed by a member, a cam disposed at the end of the arm via a rotation shaft and abutting near the outer periphery of the blind lid body, and a cam disposed on the cam via a rotation shaft. A fastening member having a support member that abuts near the outer periphery of the blind lid body, a locking plate that connects the support member and the flange, and a sealing material on the other surface of the piston. It is equipped with an air bleed conduit that passes through the lid body and the sealing material or the piston and the sealing material, and an air bleed tank that is arranged above the test object.

[Effect]

The blind lid device of this invention brings the surface of the blind lid body on which the sealing material is arranged into contact with the end surface of the tube, and also connects the flange attached to the end of the tube and the anti-sealing material disposed surface of the blind lid body. Loosen the fastening material that connects the support body installed near the outer periphery, and rotate the locking plate fixed to this fastening material to lock it to the flange surface on the side opposite to the contact surface of the blind lid body. By tightening, the tube surface is sealed.

In addition, in the blind lid device that is fastened as described above, the piston and the arm fixed to the opposite end of the piston are moved along the axis of the tube by filling the inside of the tube with test fluid etc. and increasing the internal pressure. Although it is pushed out toward the center, the blind lid main body is pressed against the tube end surface by a cam disposed at the end of the arm via a rotating shaft, further improving sealing performance.

[Example of idea]

Hereinafter, one embodiment of the blind lid device of this invention will be described with reference to FIGS. 1 to 3.

1 is a tube body with a flange 2 fixed to the end;
4 indicates a blind lid main body that is formed with an outer diameter larger than the outer diameter of this flange 2 and has a hollow portion in the center that is larger than the diameter of the pipe body 1 where the end surface side of the pipe body 1 has a larger diameter; 5 is a piston formed with a diameter slightly smaller than the diameter of the hollow portion which is disposed so as to be slidable in the thickness direction of the hollow portion of the blind lid main body 3, and 5 is a piston facing the end surface of the tube body 1. This is a sealing material that has openings smaller than the diameter of the tube body 1 on the tube end surface side arranged on four sides.

Further, 6 is formed parallel to the surface of the blind lid body 3 with a length shorter than the diameter of the blind lid body 3 fixed by a plurality of bolts 7 to the back surface of the piston 4 on which the sealing material 5 is disposed. The outer periphery of the blind lid main body 3 is provided at each end of the arm 6 via a rotation axis 9 that is perpendicular to the arm 6 and parallel to the surface of the blind lid main body 3. This is a cam that rotates in the thickness direction of the blind lid main body 3 in the vicinity and has a contact surface formed in a convex curve.

In addition, 10 is a rotation shaft disposed parallel to the outer circumferential side of the rotation shaft 9 disposed on the cam 8, and 11 is a rotation shaft disposed on the extension line of the arm 6 via the rotation shaft 10. This figure shows a rectangular parallelepiped support joined to the support body 11, and a through hole communicating with the outer circumferential side of the support body 11 from the rotation axis 10 and the surface near the outer circumference of the blind lid main body 3 is provided.

Furthermore, 12 is a bolt that is inserted through the support body 11 and the through hole of the blind lid main body 3 and has a length longer than the distance from the flange 2 to the cam 8, and 13 is a bolt that is perpendicular to the flange 2 side of this bolt 12 and is L. 14 indicates a rectangular locking plate fixed to a bolt 12.
This is a wing nut that is screwed together and abuts against the support body 11.

The operation of the blind lid device of the present invention configured as described above during a pressure test will be described.

First, loosen the wing nut 14 that is hinged to one end of each bolt 12 that passes through the support 11 of the blind lid main body 3. At the same time, the locking plate 13 fixed to the end of each bolt 12 is rotated about the bolt 12 as an axis, so that the flange 2 attached to the end of the tube 1 is rotated. The blind lid main body 3 is fastened to the end face of the pipe body 1 by locking it to the pipe end face side and tightening the wing nut 14 through the support body 11, and the sealing material is pressure-welded to maintain airtightness. .

In the blind lid device that has been tightened in this way, a test medium such as water or air is filled into the tube body 1 using a pump, etc., and the internal pressure is increased to push it out in the axial direction of the tube body 1. A thrust is generated, and this thrust slides on the piston 4 and at the same time is transmitted to the cam 8 via the arm 6 connected to the piston 4 and the rotation shaft 9.
The cam 8 is rotated in the thickness direction of the blind lid main body 3 about the rotating shaft 10, so that the entire blind lid main body 3 is evenly pressed against the tube surface, further improving sealing performance. do.

In addition to this apparatus, an embodiment will be described below with reference to FIG. 4.

Reference numeral 15 extends from the outer surface of the plate thickness circumference of the blind lid main body 3 through the sealing material 5 and a large diameter portion provided in the center of the blind lid main body 3 where the piston 4 does not come into contact, and the end portion is connected to the pipe body. 1 is an air vent conduit arranged with a length that reaches the inside of the blind lid body 3, and 16 is an air vent conduit connected to this air vent conduit 15 and installed on the outer circumferential surface of the blind lid main body 3. be.

Reference numeral 17 denotes a bearing disposed on the circumference of the piston 4 where the piston 4 and the hollow part come into contact so that the piston 4 can easily slide in the hollow part of the blind lid main body 3, A protrusion is provided on the inner circumference of the hollow part at the opposite end of the disposed hollow part, and the piston 4 is formed in a convex shape with an outer diameter slightly smaller than the inner diameter of the hollow part and the protrusion. ,
This is intended to prevent the piston 4 from falling off.

This device configured as described above is fastened to the end face of the tube 1 so that the air bleed pot 16 is above the tube 1, and depressurization after the pressure test can be easily performed.

In the above embodiment, the blind lid body 3 is attached to one end of the tube body 1, but the blind lid body 3 may be attached to both ends of the tube body 1, and in this case, one blind lid body 3 is attached to one end of the tube body 1. A pressure nozzle shall be installed on the

[Effect of idea]

As explained above, according to the pipe end blind cap device of this invention, the blind cap body can be easily attached/detached and tightened using the locking material and the fastening material using the flange fixed to the end of the pipe body. Since the blind lid body can be attached, the time required for attaching the blind lid body can be reduced, and there is no need for a retaining member for press-fitting the blind lid body to the circumference of the end portion of the tube as in the conventional case.

In addition, this device has a mechanism that uses the internal pressure to automatically press the blind lid body evenly against the end surface of the tube by increasing the internal pressure inside the tube.
It is possible to achieve the following effects: sealing can be performed reliably, normal pressure tests can be carried out, and it can also be used for a certain range of pipe bodies.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a tube end blind cap device according to an embodiment of this invention, Fig. 2 is a side view taken along the line - of Fig. 1, and Fig. 3 is a side view taken along the line - of Fig. 2. 4 is a side view showing another embodiment of this invention, FIG. 5 is a partially cutaway side view showing a conventional tube end blind cap device, and FIG. 6 is a side view taken along the line - in FIG. FIG. 1... Pipe body, 2... Flange, 3... Blind lid body, 4... Piston, 5... Seal material, 6... Arm, 7... Bolt, 8... Cam, 9, 10...
Rotating shaft, 11...Support, 12...Bolt, 13
... Locking plate, 14 ... Wing nut, 15 ... Air bleed conduit, 16 ... Air bleed socket, 17 ... Bearing.

Claims (1)

[Claims for Utility Model Registration] (1) A pipe end blind lid device used in pressure testing of a pipe body having a flange at the end, which is formed with a larger external shape than the flange and has a hollow part in the center. A blind lid body, a piston disposed in the hollow portion, an arm fixed to one side of the piston with a connecting material, and the blind lid body disposed at the end of the arm via a rotation shaft. A fastener having a cam that abuts on a flat surface of the cam, a support that abuts the surface of the blind lid body that is disposed on the cam via a rotation shaft, and a locking plate that connects the support and the flange. A pipe end blind lid device for pressure resistance testing, characterized in that a sealing material is provided on the other surface of the piston. (2) An air bleed conduit that passes through the blind lid body and the seal material or the piston and the seal material, an air bleed tank that is placed above the tube under test, and an air bleed pipe that is placed on the outer circumferential surface of the piston. 2. The tube end blind lid device for pressure tests according to claim 1, characterized in that the device is equipped with a bearing provided therein.