CN111006015A

CN111006015A - Mechanical sealing device and sealing method for container pipe joint

Info

Publication number: CN111006015A
Application number: CN201911401539.7A
Authority: CN
Inventors: 赵登东; 白海永; 金刚; 王帅; 张美静; 朱晓霞; 王玮; 赵子艳; 李澍
Original assignee: Harbin Electric Group Qinhuangdao Heavy Equipment Co Ltd
Current assignee: Harbin Electric Group Qinhuangdao Heavy Equipment Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-14
Anticipated expiration: 2039-12-30
Also published as: CN111006015B

Abstract

The invention discloses a mechanical sealing device for a container pipe joint, which comprises a sealing gland, a sealing top cover, a pull bearing plate and a press ring sealing structure.

Description

Mechanical sealing device and sealing method for container pipe joint

Technical Field

The invention belongs to the field of sealing detection, and particularly relates to a mechanical sealing device and a sealing method for a pressure container in a hydraulic test and an air pressure test.

Background

In the manufacturing field of nuclear power pressure vessels and petrochemical pressure vessels, hydraulic pressure tests and pneumatic pressure tests of the pressure vessels are mainly used for hydraulic pressure sealing and pneumatic pressure sealing of welded pipe joints without flanges by welding end covers at the end parts of the pipe joints, and when the hydraulic pressure and the pneumatic pressure are finished, the lower sealing covers are cut.

The sealing structure is complex to operate and high in cost, the pipe opening needs to be subjected to processes such as groove processing after the lower sealing cover is cut, the field construction condition is insufficient, the defect of groove processing is easily caused, and potential safety hazards are buried for the operation of the pressure container.

Therefore, the prior art needs to research and design a simple and effective sealing structure capable of withstanding high pressure.

Disclosure of Invention

In order to overcome the above problems, the present inventors have made intensive studies and designed a mechanical sealing device for a vessel pipe joint, which comprises a sealing gland, a sealing cap, a pull-bearing plate, and a press ring sealing structure, wherein the pull-bearing plate contacting the inside of a vessel is used as a force bearing point, the sealing gland and the sealing cap are used for sealing the vessel pipe joint, the press ring sealing structure is used for sealing between the sealing gland and the sealing cap, and the sealing effect at the pipe joint is improved by a double sealing means, thereby completing the present invention.

Specifically, one of the objects of the present invention is to provide a mechanical sealing device for a vessel pipe joint, which comprises a sealing gland and a sealing top cover arranged below the sealing gland.

In the invention, the sealing gland is arranged on the outer edge of the container interface, and the cover sealing gasket is arranged at the position of the sealing gland corresponding to the container interface. Preferably, the gland is threadedly coupled to the gland such that the gland presses against the cap seal by tightening the gland to effect a seal.

According to a preferred embodiment, a pulling plate is provided on the inside of the container neck, parallel to the gland and the closure cap, preferably in threaded connection with the closure cap. Preferably, the surface of the pulling bearing plate contacted with the inner wall of the container is arc-shaped.

In the invention, a pressure ring sealing structure is arranged between the sealing gland and the sealing top cover, preferably comprises a pressure ring screw, a sealing pressure ring and a pressure ring sealing gasket, more preferably, an annular groove is arranged on the lower surface of the sealing gland, and a threaded through hole is arranged in the annular groove.

In a preferred embodiment of the invention, the sealing press ring is arranged in the annular groove, the press ring screw is arranged in the threaded through hole, the upper surface of the sealing top cover is provided with a small annular boss, the press ring sealing gasket is arranged on the small annular boss, and the small annular boss is clamped with the annular groove. Preferably, a large annular boss for engaging with the small annular boss is provided on the lower surface of the gland.

According to the invention, the sealing pressure ring is in contact with the inclined surface of the pressure ring sealing gasket, and the lower end of the sealing pressure ring is provided with a notch for accommodating the pressure ring sealing gasket.

It is another object of the present invention to provide a method of sealing a container tube interface using the above apparatus, the method comprising the steps of:

step 1, putting a pull bearing plate into a container;

step 2, connecting the sealing top cover on the pull bearing plate;

and 3, connecting the sealing gland to the sealing top cover.

In the invention, step 3 comprises double sealing operations, namely, the sealing gland and the sealing top cover are fixedly connected by using a bolt and a nut to realize the sealing between the sealing gland and the pipe joint of the container; and secondly, a pressing ring screw is screwed into the threaded through hole to push the sealing pressing ring to move downwards to extrude the pressing ring sealing gasket, so that the pressing ring sealing gasket is deformed, and the sealing between the sealing gland and the sealing top cover is realized.

The invention has the advantages that:

1) the mechanical sealing device for the container pipe joint provided by the invention can resist high pressure, has two layers of sealing structures, has good sealing effect and is not easy to leak;

2) according to the mechanical sealing device for the container pipe joint, the nut is screwed down, so that the mechanical sealing device can be quickly installed, the working efficiency can be improved, and the mechanical sealing device can be repeatedly used;

3) the mechanical sealing device for the container pipe joint, provided by the invention, has the advantages of simple structure, easiness in manufacturing, simplicity in operation and strong practicability.

Drawings

Fig. 1 is an assembly view showing a mechanical sealing device for a pipe joint of the present invention and the pipe joint;

fig. 2 is a plan view showing the mechanical sealing device for a pipe joint of the present invention assembled with the pipe joint;

FIG. 3 shows a block diagram of a pull plate according to the present invention;

FIG. 4 shows a top view of a pull carrier plate according to the present invention;

figure 5 shows a cross-sectional view of a gland according to the present invention;

figure 6 shows a top view of a gland according to the present invention;

FIG. 7 shows a cross-sectional view of a seal cap according to the present invention;

FIG. 8 shows a top view of a seal cap according to the present invention;

figure 9 shows a cross-sectional view of a pressure ring gasket according to the invention;

figure 10 shows a cross-sectional view of a sealed pressure ring according to the present invention.

The reference numbers illustrate:

1-sealing gland;

11-an annular groove;

12-a threaded through hole;

13-large annular bosses;

2-sealing the top cover;

21-small annular boss;

3-pulling the bearing plate;

4-a container interface;

5-cover gasket;

6-a compression ring screw;

7-sealing the pressure ring;

71-notch

8-pressure ring sealing gasket.

Detailed Description

The invention is explained in more detail below with reference to the figures and examples. The features and advantages of the present invention will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

For the pressure container which needs to carry out the hydraulic pressure test and the air pressure test, the prior art mainly carries out the hydraulic pressure sealing or the air pressure sealing by welding an end cover at the end part of the pipe joint and cuts the lower sealing cover when the hydraulic pressure and the air pressure are finished.

To this end, according to one aspect of the present invention, there is provided a mechanical sealing apparatus for a vessel pipe joint, which includes a gland 1 and a gland cap 2, as shown in fig. 1.

In the present invention, in order to seal the pressure vessel, a seal cover 1 capable of sealing the vessel inlet 4 is first provided on the outer edge of the vessel inlet 4.

In order to make the gland 1 better seal the vessel mouth 4, in a preferred embodiment of the invention, a lid gasket 5 is provided at a position of the gland 1 corresponding to the outer edge circumference of the vessel mouth 4.

In the present invention, a seal top cover 2 is provided below a seal cover 1 in a container mouth 4.

According to a preferred embodiment of the present invention, the gland 1 is threadedly coupled to the gland cap 2. Therefore, threaded holes are formed in the sealing gland 1 and the sealing top cover 2, the sealing top cover 2 is pressed to the cover sealing gasket 5 by screwing the nut on the sealing gland 1, the cover sealing gasket 5 deforms under the action of the nut extrusion force, and the purpose of sealing the pipe interface or the container interface 4 is achieved.

The mechanical sealing device for the container pipe joint is mainly suitable for carrying out a hydraulic pressure test and a pneumatic pressure test on a pressure container, and in order to avoid the sealing device from being ejected out under the action of hydraulic pressure or air pressure, the connection strength between the sealing device and a pipe joint or a container joint needs to be enhanced as much as possible.

Thus, according to a preferred embodiment of the invention, the inner wall of the container is also used as a force bearing point, for which purpose a pulling and bearing plate 3 is additionally provided on the inside of the container finish 4, in particular at the mouth of the spout or finish (where the container internal diameter begins to narrow, forming the finish), said pulling and bearing plate 3 being parallel to the gland 1 and the closure cap 2 and in contact with the inner surface of the container.

According to a preferred embodiment of the present invention, the pulling plate 3 is screwed with the gland cover 2, so that the gland cover 2 is connected between the gland cover 1 and the pulling plate 3, i.e. the gland cover 2 is fixedly connected with the gland cover 1 and the pulling plate 3 by bolts and nuts, respectively.

In the invention, because the joint of a general pressure container and a pipe joint or a container joint is an arc-shaped curved surface, in order to increase the contact area between the inner wall of the container and the pull bearing plate 3, according to a preferred embodiment of the invention, the surface of the pull bearing plate 3 in contact with the inner wall of the container (particularly the edge of the pull bearing plate 3, particularly the part in complete contact with the inner wall of the container) is arranged to be arc-shaped, so that the pull bearing plate 3 can be attached to the inner wall of the container, and the connection firmness of the whole sealing device and the container pipe joint is further improved.

In order to facilitate the installation of the pulling deck 3 inside the pipe joint, it is preferred that the pulling deck 3 is arranged according to the inner structure of the container, and is arranged in a cross shape for the joint pipe joint, as shown in fig. 3-4. The barrel pipe joint is arranged in a batten type.

In the invention, the pulling bearing plate 3 is firstly put into the container through the manhole channel of the container and then is connected with the sealing top cover through screw threads.

In the present invention, since the gland 1 and the gland 2 are connected by bolts, in order to prevent leakage of water pressure or gas pressure (or leakage of liquid or gas) at the bolt connection, in a preferred embodiment of the present invention, a press ring sealing structure is provided between the gland 1 and the gland 2, the press ring sealing structure being provided radially outside the bolts for connecting the gland 1 and the gland 2.

According to the invention, the pressure ring sealing structure comprises a pressure ring screw 6, a sealing pressure ring 7 and a pressure ring gasket 8, as shown in fig. 1.

In a preferred embodiment of the present invention, an annular groove 11 is formed in a lower surface of the gland 1, and a plurality of screw through holes 12 are formed in the annular groove 11 in a direction perpendicular to an upper surface of the gland 1.

Preferably, the sealing press ring 7 is arranged in the annular groove 11, and the press ring screw 6 is arranged in the threaded through hole 12.

Further preferably, a small annular boss 21 is arranged on the upper surface of the seal top cover 2, the small annular boss 21 is engaged with the annular groove 11, and the pressure ring seal gasket 8 is arranged on the small annular boss 21.

In the invention, the compression ring screw 6 is screwed to push the sealing compression ring 7 to move downwards to extrude the compression ring sealing gasket 8, so that the compression ring sealing gasket 8 deforms, and the sealing purpose of the sealing top cover and the sealing gland is realized.

In order to enhance the sealing performance of the pressure ring sealing structure, in a preferred embodiment of the present invention, the contact surface between the sealing pressure ring 7 and the pressure ring gasket 8 is an inclined surface.

In the invention, the width of the pressure ring sealing gasket 8 is the same as that of the small annular boss 21 on the sealing top cover 2, and the section of the pressure ring sealing gasket 8 perpendicular to the radial direction is in a right-angled trapezoid shape, as shown in fig. 9.

According to a preferred embodiment of the present invention, a notch 71 is formed at the lower end of the sealing collar 7, and the notch 71 has the same shape as the shape of the collar gasket 8 and is used for accommodating the collar gasket 8, as shown in fig. 10.

When the contact surface of the sealing pressure ring 7 and the pressure ring sealing gasket 8 is a plane, the pressure applied to the pressure ring sealing gasket 8 is vertical to the pressure, and the pressure ring sealing gasket 8 is uniformly deformed to the periphery. When the contact surface of the sealing pressure ring 7 and the pressure ring sealing gasket 8 is an inclined plane, the force applied to the pressure ring sealing gasket 8 is uneven, the pressure ring sealing gasket is more deviated to the extrusion deformation of the inner wall of the annular groove 11, and the sealing effect at the moment is better.

In order to enhance the clamping effect between the gland 2 and the annular groove 11, in a preferred embodiment of the invention, a large annular boss 13 is provided on the lower surface of the gland 1, the large annular boss 13 having the same inner diameter as the outer diameter of the annular groove 11 for clamping with the small annular boss 21.

According to the second aspect of the present invention, there is also provided a method for sealing a vessel pipe joint, preferably using the mechanical sealing device for vessel pipe joints according to the first aspect of the present invention.

In the invention, the installation sequence of the mechanical sealing device of the container pipe interface is not particularly limited, and all the sequences capable of realizing the installation of the sealing device can be applied to the invention.

In a preferred embodiment, the method comprises the steps of:

step 1, putting a pull bearing plate 3 into a container;

in the step 1 of the invention, the pulling bearing plate 3 is firstly placed into the container through the manhole channel of the container, and then the pulling bearing plate 3 is placed flat, so that the surface with the arc-shaped edge is attached to the inner wall of the container.

Step 2, connecting the sealing top cover 2 to the pull bearing plate 3;

in the step 2 of the invention, a bolt is firstly connected on the sealing top cover 2, then the connected bolt passes through a unthreaded hole on the pull bearing plate 3, and the sealing top cover 2 and the pull bearing plate 3 are connected together by a nut.

And 3, connecting the sealing gland 1 to the sealing top cover 2.

In step 3 of the present invention, the method comprises the following substeps:

substep 3-1, mounting the cap seal 5 on the tube or container interface 4;

substep 3-2, mounting the pressure ring gasket 8 on the small annular boss 21 of the seal top cover 2;

substep 3-3, installing the sealing press ring 7 in the annular groove 11 of the sealing press cover 1;

substep 3-4, fixedly connecting the sealing gland 1 and the sealing top cover 2 by using a bolt and a nut to complete the sealing operation at the pipe interface or the container interface 4;

and 3-5, screwing a pressing ring screw 6 into the threaded through hole, pushing the sealing pressing ring 7 to move downwards to extrude the pressing ring sealing gasket 8, so that the pressing ring sealing gasket 8 deforms, and the sealing operation between the sealing gland 1 and the sealing top cover 2 is completed.

In a preferred embodiment, the pulling bearing plate 3 and the seal cap 2 can be connected together by bolts and nuts and then placed into the container tube interface 4. And then installing the sealing gland 1, the cap sealing gasket 5 and the pressure ring sealing structure according to the step 3.

Examples

The mechanical tube connector sealing device used in this embodiment is shown in fig. 3-10, wherein the pulling support plate 3 used in this embodiment is a cross-shaped pulling support plate, and four through holes are uniformly formed on the cross-shaped pulling support plate.

Four threaded blind holes corresponding to the unthreaded holes on the pull bearing plate 3 are uniformly formed in the lower surface of the seal top cover 2 adopted in the embodiment, and four threaded blind holes are uniformly formed in the upper surface of the seal top cover 2. A small annular boss 21 is further arranged on the upper surface of the seal top cover 2, wherein the outer diameter of the small annular boss 21 is the same as that of the seal top cover 2.

In the embodiment, the gland 1 is provided with four threaded holes corresponding to the blind threaded holes on the upper surface of the gland 2. An annular groove 11 is formed in the lower surface of the sealing gland 1, eight threaded through holes 12 are formed in the bottom of the groove, and the threaded through holes 12 are formed in the outer side of threaded holes corresponding to the threaded blind holes in the surface of the sealing top cover 2. A large annular boss 13 having an inner diameter identical to the outer diameter of the annular groove 11 is also provided on the lower surface of the gland 1.

The section of the pressure ring gasket 8 in the radial direction perpendicular to the pressure ring gasket used in this embodiment is a right trapezoid, and a notch 71 having the same shape as the pressure ring gasket 8 is formed in the lower end of the sealing pressure ring 7. The lid gasket 5 employed in the present embodiment is a rubber gasket.

When in use:

1) putting the pulling bearing plate 3 into the container;

firstly, the pulling bearing plate 3 is placed into the container from the manhole channel of the container, and then the pulling bearing plate 3 is placed flat, so that the side with the arc-shaped edge is attached to the inner wall of the container.

2) Connecting the sealing top cover 2 to the pull bearing plate 3;

four bolts are firstly connected in four threaded blind holes on the lower surface of the seal top cover 2, then the connected bolts penetrate through four unthreaded holes on the pull bearing plate 3, and the seal top cover 2 and the pull bearing plate 3 are connected together by utilizing four nuts.

And 3, connecting the sealing gland 1 to the sealing top cover 2.

Firstly, the cover sealing gasket 5 is arranged on the container pipe interface 4, the pressure ring sealing gasket 8 is arranged on the small annular boss 21 of the sealing top cover 2, and the sealing pressure ring 7 is arranged in the annular groove 11 of the sealing pressure cover 1.

And then the sealing gland 1 and the sealing top cover 2 are clamped through the small annular boss 21 and the large annular boss 13, then the four bolts are screwed into the threaded blind holes in the upper surface of the sealing top cover 2 through the threaded holes in the sealing gland 1, and nuts are arranged on the bolts, so that the sealing gland 1 extrudes the sealing gasket 5 to complete the sealing of the pipe interface.

Finally, the pressing ring screw 6 is screwed into the threaded through hole 12, the sealing pressing ring 7 can be pushed to move downwards, the pressing ring sealing gasket 8 is extruded, the pressing ring sealing gasket 8 is deformed, the purpose of sealing the sealing top cover 2 and the sealing gland 1 is achieved, and the sealing operation between the sealing gland 1 and the sealing top cover 2 is completed.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on an operating state of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention has been described above in connection with preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the invention can be subjected to various substitutions and modifications, and the substitutions and the modifications are all within the protection scope of the invention.

Claims

1. The mechanical sealing device for the container pipe joint is characterized by comprising a sealing gland (1) and a sealing top cover (2) arranged below the sealing gland (1).

2. The sealing arrangement according to claim 1, characterized in that the gland (1) is arranged on the outer edge of the container finish (4), and a cap seal (5) is arranged at the position of the gland (1) corresponding to the container finish (4).

3. A sealing arrangement according to claim 2, characterized in that the gland (1) is screwed to the gland cover (2), and sealing is achieved by tightening the gland cover (1) so that the gland cover (2) presses against the cover gasket (5).

4. A sealing arrangement according to claim 2 or 3, characterized in that a pulling and bearing plate (3) is provided on the inside of the container finish (4), the pulling and bearing plate (3) being parallel to the gland (1) and the gland (2), preferably being in threaded connection with the gland (2).

5. A sealing arrangement according to claim 4, characterized in that the side of the pulling and carrying plate (3) which is in contact with the inner wall of the container is curved.

6. A sealing arrangement according to one of claims 1 to 5, characterized in that a press ring sealing arrangement, preferably comprising a press ring screw (6), a sealing press ring (7) and a press ring gasket (8), is provided between the gland (1) and the gland cover (2), preferably with an annular groove (11) provided in the lower surface of the gland (1), the annular groove (11) being provided with a threaded through hole (12) therein.

7. The sealing device according to claim 6, characterized in that the sealing press ring (7) is arranged in the annular groove (11), the press ring screw (6) is arranged in the threaded through hole (12), a small annular boss (21) is arranged on the upper surface of the sealing top cover (2), the press ring sealing gasket (8) is arranged on the small annular boss (21), and the small annular boss (21) is clamped with the annular groove (11).

8. The sealing device according to claim 6 or 7, characterized in that the sealing press ring (7) is in inclined contact with the press ring gasket (8), and the lower end of the sealing press ring (7) is provided with a notch (71) for accommodating the press ring gasket (8).

9. A sealing arrangement according to claim 1, characterised in that a large annular boss (13) is provided on the lower surface of the gland (1) for engagement with a small annular boss (21).

10. A method of sealing a container coupling, preferably using a sealing device according to any one of claims 1 to 9, characterized in that it comprises the steps of:

step 1, putting a pull bearing plate (3) into a container;

step 2, connecting the sealing top cover (2) to the pull bearing plate (3);

and 3, connecting the sealing gland (1) to the sealing top cover (2).