JPH0128437Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing member for a pipe hydraulic testing machine.

At steel mills and the like, water pressure tests are conducted on manufactured pipes to confirm their quality. In a hydraulic testing machine, after the pipe is fixed in place, the openings at both ends of the pipe are covered with test heads.
A water pressure test is performed by increasing the pressure of water injected into a pipe to a predetermined pressure using water pressure equipment.

The structure of this test head is shown in FIG.

Figure 1 shows its longitudinal section, with 1 being the test head body, 2 being a hole into which the test pipe 3 is inserted, 4 being a through hole for injecting water into the pipe and pressurizing the water, and 5 being a ring-shaped A groove is provided around the side wall of the hole 2 to attach the seal packing 6, and 7 is a hole through which pressurized water is introduced into the groove 5 in order to press the seal packing 6 against the outer peripheral surface of the test pipe 3 for sealing. be. That is, before creating a test pressure in the pipe 3, high pressure water is forced into the hole 7 using water pressure equipment (not shown), and the seal packing 6 is
The water pressure is applied to the outer circumferential surface of the pipe to reduce the diameter of the seal packing 6 and bring the inner circumference of the seal packing into close contact with the outer circumference of the pipe. Therefore, the seal packing 6 is required to have elasticity in the diametrical direction.

This conventional seal packing 6 has an annular elastic body 8 made of rubber or the like, as shown in FIG.
and a girder spring 9 embedded in the elastic body 8. This garter spring 9 is for preventing the elastic body 8 from deforming and bulging outward due to the force of the high pressure water in the pipe.

However, as a recent trend, due to changes in the shape and structure of pipes, and demands for ease of operation,
The gap d between the hole 2 and the pipe 3 (see Figure 1) is extremely large.

However, the garter spring 9 embedded in the seal packing 6 is almost a close-fitting spring in the form of a ring, and its elasticity is not very large.
Therefore, if there is a large gap d, sufficient watertightness cannot be obtained. In addition, in recent years, in order to test as many pipes as possible in a short period of time and improve the work efficiency of pipe hydraulic tests, the seal packing 6 has been designed to shorten its deformation time, especially the time required to return from a contracted state to an open state. is desired.

Therefore, a proposal was made in which a step is formed on the edge of the inner circumferential surface of the seal packing, a plurality of plates are arranged in an annular shape on this step, and a compression spring is provided between each plate. (For example, Utility Model 1974-
145185).

However, with the technique disclosed in the above publication, it is necessary to attach a pin to fix the plate to the seal packing, and to provide a guide member to guide the movement of the plate in the circumferential direction, which increases the number of parts. There was a drawback that the amount increased.

The purpose of this invention is to have high elasticity, to be usable even when the gap d between the pipe and the pipe is large, and to be able to return from a contracted state to an open state in a short time.
Moreover, it is an object of the present invention to provide a sealing member for pipe water pressure testing that has a small number of parts.

In order to achieve the above object, the sealing member for pipe water pressure tests of the present invention has a step formed on at least one of the inner circumferential edges of the sealing member main body made of a ring-shaped elastic body. The sealing member is made up of a plurality of plate bodies arranged in an annular shape, and the plate body has protrusions formed on two surfaces that contact the sealing member main body, and one of the protruding parts is formed on the two sides of the plate body that are in contact with the sealing member main body. The other protrusion is biased in the circumferential direction by an elastic member disposed between the protrusion of an adjacent plate, and one end of the plate is secured to the other end of the adjacent plate. It is characterized by being provided with a recessed part into which it fits.

According to the above configuration, when performing a pipe hydraulic test, when the pipe is inserted into the head on which the seal member body is attached and the seal member body is pressed in the diametrical direction from the outside, the The plurality of plates move toward each other against the elastic force of the elastic member, and the other end of the adjacent plate fits into the recess at one end of the plate. For this reason, the ring formed by the plate is reduced, and the inner surface of the plate comes into close contact with the outer peripheral surface of the pipe, making it possible to seal the end of the pipe with the head. In addition, when stopping the pipe hydraulic test, when the pressure on the sealing member body is stopped, the plurality of plates immediately move away from each other due to the elastic force of the elastic member, and the ring formed by the plates expands. So,
The sealed state at the end of the pipe can be quickly released.

The embodiments shown in the accompanying drawings will be described below.

FIG. 3 shows a sealing member 10 according to an embodiment of the present invention.
FIG. The sealing member 10 is an elastic body (rubber in this embodiment) having a stepped portion 11 formed by notching one peripheral edge of the inner peripheral surface over the entire circumference.
a ring-shaped sealing member main body 12 made of
It consists of a truncated fan-shaped plate body 13 arranged at 1. Further, the seal member main body 12 is provided with a groove 12B on its outer peripheral surface.

4 is a front view of the seal member main body 12, FIG. 5 is a perspective view of the plate body 13, and FIG. 6 is an enlarged view of the main parts of the seal member 10.

The plate 13 has a truncated fan shape when viewed from the front. A protrusion 14 is provided at one end thereof to protrude in the direction of fan-shaped diameter expansion and the thickness direction of the plate. Further, a recess 15 is provided at one end.

When disposing this plate 13 in the throw part 11, the protruding part 14 should be on the side that contacts the stepped part 11, and the other end 16 of the plate 13 adjacent to the recess 15 should be
(See Figure 6).

And the protruding parts 1 of the adjacent plate bodies 13, 13...
4, 14... are provided with elastic members 12A,....
In the illustrated embodiment, the elastic member 12A is made of rubber and is integrated with the seal member main body 12, which is made of rubber.

FIG. 7 is a sectional view of a sealing member 20 according to a different embodiment of the present invention, and corresponds to FIG. 3 of the aforementioned embodiment. In this embodiment, a step portion 2 is provided at the other end edge of the inner circumferential surface of the seal member main body 12.
1 is provided, and a plate body 23 is disposed annularly on this stepped portion 21.

FIG. 8 is a front view of the plate body 23, and FIG. 9 is a cross-sectional view taken along the line of FIG. 8. This plate body 23 has a truncated fan shape and is provided with a pin 25. FIG. 10 is a view of the plate 23 disposed on the step 21 as seen from the direction of arrow X (see FIG. 7), and as shown, the ring formed by the plate 13 ( (see FIG. 6), the ends of the plates 23 are arranged at a predetermined gap without overlapping each other, and are annular.

The sealing members 10, 20 are inserted into the grooves 5 shown in FIG.
In order to attach the plate 1 of the seal members 10 and 20 to
Attach it so that the side with 3 facing toward the opening of hole 2.

Next, a pipe water pressure test using a head equipped with a seal member as described above will be explained.

After inserting pipe 3 into hole 2 of head 1, insert pipe 3 into hole 7.
Pressurized water is injected into the groove 5 from below. The sealing member 10 or 20 is contracted by the pressure of the pressurized water and comes into contact with the outer circumferential surface of the pipe 3, and is pressed even more strongly.
At this time, as shown in FIGS. 11 and 12, the ring formed by the plate 13 and the ring formed by the plate 23 are respectively reduced.
Therefore, the inner circumferential surface of each of the plates 13 and 23 comes to be strongly pressed against the outer circumferential surface of the pipe 3, and the sealing member main body 12 tends to bulge out due to the water pressure received from inside the pipe or from the outer circumferential surface thereof. is prevented.

FIGS. 11 and 12 show the plate 13,
23 is a diagram showing a reduction deformation of the ring formed by
The right half of the figure shows the diameter expansion before pressurization, and the left half shows the diameter contraction after pressure deformation.

However, in the present invention, the sealing member deforms extremely quickly. That is, the time required to transform from the open state to the sealed state depends on the flow rate of pressurized water injected from the hole 7 in the head, but the return from the sealed state to the open state depends on the elastic force of the seal member main body 12. It tends to take a lot of time to recover. Furthermore, if the seal members 10 and 20 do not contract uniformly over the entire circumference when they contract, a similar phenomenon will occur when they expand, and it will take a particularly long time for a certain part of the circumference to return. .

In the present invention, a protrusion 14 is provided on the plate 13, and an elastic member 12A is provided between the protrusions 14 of adjacent plates 13, 13, . . . . Elastic member 1
2A is the same number of sealing member bodies 1 as the plate bodies 13;
They are provided almost equally in the circumferential direction of 0 and 20. Therefore, when the seal members 10 and 20 contract in the radial direction and come into close contact with the pipe, the elastic member 12A is simultaneously compressed and deformed in the circumferential direction, and when the seal members 10 and 20 are opened, the elastic member 12A is compressed and deformed against the plate body 13. A force in the circumferential direction is applied by the elastic body 12A, so that the seal members 10 and 20 can quickly return to the open state.

Further, according to this embodiment, since the elastic members 12A are arranged almost evenly in the circumferential direction, the entire circumference of the sealing member is evenly and uniformly contracted and expanded in the radial direction. Therefore, the seal members 10, 20
The release/return time is made uniform over the entire circumference. At the same time, there is an advantage that the life of the seal members 10, 20 is extended because non-uniform deformation stress can be avoided.

In the above embodiment, the elastic member 12A is integrated with the seal member main body 12, but it may be a separate member. Further, in order to strengthen the elastic force, a compression coil spring may be embedded in the elastic member 12A.

Furthermore, in the embodiments shown in FIGS. 7 to 11, the stepped portion 2
Although the plate 23 is disposed at the step 21, the plate 13 may also be disposed at the stepped portion 21.

In addition, since a large stress is generated in the plate bodies 13, 23 when pressurized in this way, the plate bodies 13, 23
is preferably made of high-strength steel or light alloy.

As described above, in the sealing member according to the present invention, the end edge of the inner circumferential surface is a stepped portion, and a plate is arranged in an annular manner in the stepped portion, so that the swelling of the sealing member due to pressurized water is completely prevented. Prevented. Particularly, even when the difference between the outside diameter of the pipe and the inside diameter of the hole in the head is large, watertightness can be ensured, and the workability of the pipe hydraulic test is improved.

Furthermore, the sealing member of the present invention shrinks and returns extremely quickly, making it possible to test a large number of pipes in a short period of time. In addition, since this deformation of contraction and return occurs evenly, the sealing performance is extremely high, and there is no local deterioration and the life is long.

Furthermore, the sealing member of the present invention has a small number of parts and is easy to handle.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the head for water pressure testing of pipes.
FIG. 2 is a sectional view of a conventional seal member, FIGS. 3 and 7 are sectional views of a seal member according to an embodiment of the present invention, and FIG. 4 is a side view of a seal member main body according to an embodiment of the present invention. 5 is a perspective view of the plate 13, FIG. 6 is an enlarged front view of the sealing member, FIG. 8 is a front view of the plate 23, FIG. 9 is a sectional view taken along the line of FIG. Figure 10 is a rear view of the seal member, the first
1 and 12 are views showing deformation of the annularly arranged plates 13 and 23, respectively. 1... Test head body, 2... Hole, 5...
Groove, 6... Seal packing, 7... Hole, 10, 2
0... Seal member, 11, 21... Step portion, 12...
... Seal member main body, 12A ... Elastic member, 13,
23...Plate body, 14...Protrusion part, 15...Recessed part,
25...Pin.

Claims (1)

[Claims for Utility Model Registration] 1. A step is formed on at least one edge of the inner peripheral surface of a sealing member body made of a ring-shaped elastic body, and a plurality of plates are arranged in an annular shape on this step. This plate body has protrusions formed on two sides in contact with the seal member main body, one of the protrusions is latched to the seal member main body, and the other protrusion is It is biased in the circumferential direction by an elastic member disposed between the protrusions of adjacent plate bodies, and one end of the plate body is provided with a recess into which the other end of the adjacent plate body fits. A sealing member for pipe water pressure testing characterized by: 2. The sealing member for pipe hydraulic testing according to claim 1, wherein the elastic member is integrated with the sealing member main body. 3. The sealing member for pipe hydraulic testing according to claim 1 or 2, wherein a coil spring is embedded in the elastic member.