JPS6116505Y2 - - Google Patents

Description

[Detailed description of the invention] For example, when inspecting metal pipes attached to drinking water vending machines, the present invention applies hydraulic pressure to the pipe while it is inserted into the end of the pipe and fixed. This is a hydraulic pressure testing plug for testing whether or not there is a leak in a pipe under certain conditions.More specifically, it is a cylindrical body that can be fitted inside the end of the pipe to be tested, and an elastic seal is fitted onto the outside to hold it. The present invention relates to a plug for hydraulic pressure testing, which is provided with a seal pressing member that presses the elastic seal from inside and outside in the direction of the tube axis to elastically deform it into a sealing state in which it is brought into elastic close contact with the outer circumferential surface of a cylindrical body and the inner circumferential surface of a tube to be inspected.

The hydraulic pressure testing plug configured in this manner can deform the elastic seal itself under strong pressure and significantly improve the adhesion with the watertight part. As shown, a bottomed cylindrical plug member with a valve is fitted onto the end of the pipe to be inspected, and an O Compared to the case where the plug member is sealed with a sealing material such as a ring and a locking member attached to the plug member is engaged with the outer peripheral surface of the pipe to be inspected to prevent the plug member from coming off.
This type of hydraulic pressure inspection plug can significantly improve sealing performance and is easy to remove after inspection. Since the plug is configured to be held against the hydraulic pressure applied to the pipe to be inspected using only the frictional force of the The frictional force between the inner surface of the test tube and the elastic sealing material is reduced, resulting in problems such as the plug being unable to withstand the pressure of the test liquid and slipping out.

As mentioned above, the present invention employs a structure in which an elastic seal is inserted into the inner circumferential side of the tube to be inspected, and its sealing performance is improved by deformation under pressure. Even with such pipes to be inspected, hydraulic pressure tests can be carried out safely without the plug accidentally coming out and while avoiding damage to the inner surface of the pipe to be inspected. Its purpose is to allow easy removal of the plug.

The features of the present invention to achieve the above object include a cylindrical body that can be fitted into the end of the tube to be inspected;
An annular elastic seal is inserted into the inside of the tube to be inspected while being fitted onto the outside of the cylindrical body, and the elastic seal is pressed from both sides of the tube to be inspected in the tube axis direction to move the elastic seal into the tube. a seal clamping mechanism that elastically brings the outer circumferential surface of the shaped body into close contact with the inner circumferential surface of the pipe to be inspected;
a retaining mechanism for fixing the cylindrical body, the elastic seal, and the seal clamping mechanism to the tube to be inspected so as to prevent them from coming out; a tightening operation tool that is screwed into a flange portion formed on the insertion end side of the cylindrical body and a male threaded portion formed on the outer peripheral surface of the other end side of the cylindrical body;
a seal pressing member that clamps the elastic seal in cooperation with the flange by moving toward and away from the flange as the tightening operation tool is operated; An annular retaining member having a through hole with a diameter slightly larger than the outer diameter of the tube to be inspected, and a biasing member that urges the retaining member to take an inclined attitude with respect to the axis of the tube to be inspected. a biasing mechanism; and the inclined retaining member.
The tube to be inspected is configured with a connector that connects the side of the tube to be inspected that is biased toward the end of the tube in the tube axis direction to a seal pressing member located outside of the tube to be inspected, and this structure provides the following effects. play.

In other words, during a hydraulic pressure test, the pressure is affected by the frictional force acting between the inner surface of the tube to be inspected and the elastic sealing material that is elastically adhered thereto, and the force of movement of the seal pressing member in the extraction direction due to the test liquid pressure. Combined with the anti-removal action of the anti-removal member that bites into the outer surface of the test tube, it ensures that the plug will not be accidentally removed even if the inner surface of the test tube is wet. This allows safe hydraulic testing under high pressure. Furthermore, since the retaining member is inclined and is configured to bite into the outer circumferential surface of the tube to be inspected, it is possible not only to avoid unexpected damage to the inner surface of the tube to be inspected, but also to prevent the retaining member from falling out. In the wide space around the outer periphery of the seal pressing member, it can be easily bitten and released by simply changing the degree of inclination of the retaining member, making it easier to remove the plug after inspection. I was able to do it smoothly.

Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 to 3 show an example of the hydraulic pressure testing plug of the present invention, which is a metal cylindrical body 1 that can be fitted into the end of the pipe to be tested P in communication with the end of the pipe to be tested P. A dish-shaped annular receiving member 2 is disposed oppositely at an appropriate interval in the axial direction of the cylindrical body at a position corresponding to the internal fitting of the cylindrical body.
The elastic seal 3 is externally fitted and held via A and 2B, and this elastic seal 3 is attached to the pipe P to be inspected.
a seal clamping mechanism 4 that clamps the elastic seal 3 from both sides in the tube axis direction to elastically bring the elastic seal 3 into close contact with the outer circumferential surface of the cylindrical body 1 and the inner circumferential surface of the tube to be inspected P; and a retaining mechanism 9 for fixing the elastic seal 3 and the seal clamping pressure mechanism 4 to the pipe P to be inspected so as to prevent them from coming off.

The cylindrical body 1 has a flange portion 1a formed at the end thereof inserted into the pipe P to be inspected, and a male threaded portion 1A formed on the outer circumferential surface of the other end, and A cap 5 having an air vent hole 5a formed in its peripheral wall is screwed onto its end.

The seal clamping pressure mechanism 4 includes a flange portion 1 formed on the insertion end side of the cylindrical body 1 into the pipe P to be inspected.
a, a tightening operation tool 6 that is screwed into the external threaded part 1A formed on the outer peripheral surface of the other end of the cylindrical body 1, and as the tightening operation tool 6 is operated, the tightening operation tool 6 is tightened relative to the flange part 1a. The seal pressing member 7 clamps the elastic seal 3 in cooperation with the flange portion 1a by moving near and far. The elastic seal 3, whose movement inward of the pipe is restricted by the flange portion 1a of the cylindrical body 1 by movement in the seal pressing direction,
The cylindrical body 1 is made to bulge and deform in the diameter direction of the pipe P to be inspected.
By bringing the outer circumferential surface and the inner circumferential surface of the pipe P into close elastic contact with each other, it is configured to seal between these two 1 and P.

The retaining mechanism 9 is configured to prevent the pipe to be inspected P.
An annular retaining member 8 which is oval in shape when viewed in the direction of the tube axis and has a through hole 8A slightly larger than the outer diameter of the pipe P to be inspected is fitted onto the outside of the retaining member 8. Among both ends 8a and 8b in the long diameter direction, one end 8a in which a long hole 8c along the tube axis direction is formed is fixed to the tip end side of the seal pressing member 7 in the pressing direction as a coupling tool 10. A bracket 11 that fits and engages the pin and is fixed to the outer circumference of the seal pressing member 7 at a location opposite to the pin 10 that stands upright in the radial direction has a rod 12 that extends along the tube axis direction. is pivotally attached to the other end 8b of the retaining member 8 in a state of penetrating it, and the outer circumferential portion of this rod 12 has a direction in which the other end 8b of the retaining member 8 is separated from the bracket 11. A spring 13 serving as a biasing mechanism that biases the entire retaining member 8 so as to be inclined with respect to the tube axis of the pipe P to be inspected by moving and biasing the retaining member 8 is fitted onto the outside of the spring 13. The opposing portions of the inner peripheral edges of the through holes 8A of 8 are separated from each other by an appropriate distance in the tube axis direction on the outer peripheral surface of the pipe P to be inspected by the force of movement of the seal pressing member 7 in the extraction direction due to the pressure of the test liquid. The structure is such that the above-mentioned biting is released by biting into the part and moving it close to the bracket 11 against the biasing force of the spring 13.

FIG. 4 shows another embodiment, in which the pipe to be inspected P
A ring-shaped retaining member 8, which is oval in shape when viewed in the direction of the tube axis and has a through hole 8A slightly larger than the outside diameter of the pipe P to be inspected, is fitted onto the outside of the retaining member 8. One end 8a in the long diameter direction of the seal pressing member 7 is fitted onto a bolt as a connecting tool 10 which is screwed and fixed to the large diameter portion 7A of the seal pressing member 7 via a nut 14, and at the outer peripheral part of the bolt, and
Between one end 8a of the retaining member 8 and the seal pressing member 7, there is an inclined state in which the other end 8b of the retaining member 8 is separated from the large diameter portion 7A of the seal pressing member 7, in other words, A spring 13 is interposed that urges the opposing portion of the inner circumferential edge of the through hole 8A of the retaining member 8 to bite into the outer circumferential surface of the tube P to be inspected.

When the retaining member 8 and the seal pressing member 7 are connected at one place in this manner, there is an advantage that the structure can be simplified by reducing the number of members.

FIG. 5 shows yet another embodiment of the structure in which the locking member 8 is connected at one point as shown in FIG. Due to the moving force of the pipe to be inspected P
An auxiliary retaining member portion 8' that bites into two locations in the tube axis direction on the outer circumferential surface is integrally provided. This configuration has the advantage of being able to effectively prevent unexpected movement of the plug.

Further, as shown in FIG. 6, the auxiliary retaining member portion 8' is connected to the other end portion 8b of the retaining member 8.
Alternatively, it may be integrally provided intersecting with the retaining member 8.

[Brief explanation of the drawing]

The drawings show an embodiment of the hydraulic pressure testing plug according to the present invention, and FIG. 1 is a sectional view showing the seal pressed state;
FIG. 2 is a cross-sectional view, FIG. 3 is a cross-sectional view showing a state in which the seal pressure is released, and FIGS. 4 to 6 are cross-sectional views showing other embodiments. 1... Cylindrical body, 1a... Flange portion, 1A...
Male thread part, 3... Elastic seal, 4... Seal clamping mechanism, 6... Tightening operation tool, 7... Seal pressing member, 8... Removal prevention member, 8A... Through hole, 9...
Removal prevention mechanism, 10... Connector, 13... Urging mechanism, P... Pipe to be inspected.

Claims (1)

[Scope of utility model registration request] A cylindrical body 1 that can be fitted into the end of the tube to be inspected P, an annular elastic seal 3 that is fitted onto the outside of the cylindrical body 1 and inserted into the inside of the tube to be inspected P, and its elasticity. A seal clamping mechanism that clamps the seal 3 from both sides of the pipe P to be inspected in the tube axis direction to elastically bring the elastic seal 3 into close contact with the outer circumferential surface of the cylindrical body 1 and the inner circumferential surface of the tube P to be inspected. 4, and a retaining mechanism 9 for fixing the cylindrical body 1, the elastic seal 3, and the seal clamping pressure mechanism 4 to the tube to be inspected P in a state where they are not removed, and the seal clamping pressure mechanism 4 is fixed to the pipe P to be inspected. A tightening operation tool 6 screwed into a flange portion 1a formed on the insertion end side of the cylindrical body 1 into the inside of the tube to be inspected P, and a male thread portion 1A formed on the outer peripheral surface of the other end side of the cylindrical body 1;
and a seal pressing member 7 that clamps the elastic seal 3 in cooperation with the flange portion 1a by moving toward and away from the flange portion 1a relative to the flange portion 1a as the tightening operation tool 6 is operated, The retaining mechanism 9 includes an annular retaining member 8 having a through hole 8A having a diameter slightly larger than the outer diameter of the tube P to be inspected, and the retaining member 8 being attached to the axis of the tube P to be inspected. The biasing mechanism 13 that biases the biasing mechanism 13 to take the tilted posture and the side of the tilted retaining member 8 that is biased toward the end of the tube in the tube axis direction of the tube to be inspected P are placed on the outside of the tube to be inspected P. A hydraulic pressure testing plug comprising a connecting tool 10 connected to a seal pressing member 7 located at.