End sealing structure of ultrahigh-pressure pipeline

Abstract

The utility model provides an ultrahigh pressure pipeline end sealing structure, and belongs to the technical field of industrial pipeline sealing. The sealing structure comprises a plug hole and a threaded plug, the plug hole is formed in the end of the pipeline, a conical sealing face is arranged at the bottom of the plug hole, and internal threads are arranged on the side wall of the plug hole. The threaded plug comprises a plug body, a sealing face is arranged at the end of the plug body, and the sealing face is matched with the conical sealing face. And external threads are arranged on the outer surface of the plug body and are matched with the internal threads. The end part of the threaded plug is processed into a sealing structure matched with the sealing surface of the end part of the pipeline, so that the functions of plugging and sealing the end part of the pipeline can be realized at the same time, and the problem of sealing the end part of the pipeline under an ultrahigh-pressure working condition is solved; due to the fact that the threaded plug is in threaded connection with the plug hole in the end of the pipeline, the end seal of the pipeline can be quickly disassembled and overhauled, and the disassembly and assembly workload is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial pipeline sealing, and in particular relates to an ultra-high pressure pipeline end sealing structure. Background Art

[0002] Conventional ultra-high pressure pipeline end sealing uses flange covers and threaded flanges for sealing, which is generally suitable for scenarios with smaller pipe diameters. However, for large-diameter pipe ends, under ultra-high pressure conditions (generally pressure exceeding 100 MPa), the flange size will become very large, operation and maintenance will be difficult, the manufacturing cost will be high, and the sealing effect will be poor. Utility Model Content

[0003] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide an ultra-high pressure pipeline end sealing structure that can be used for sealing and plugging the ultra-high pressure pipeline end, thereby improving the sealing effect and reducing the workload of disassembly and maintenance.

[0004] The utility model is realized through the following technical solutions:

[0005] The utility model provides an ultra-high pressure pipeline end sealing structure, comprising a plug hole and a threaded plug.

[0006] The plug hole is provided at the end of the pipeline, the bottom of the plug hole is provided with a conical sealing surface, and the side wall of the plug hole is provided with an internal thread;

[0007] The threaded plug includes a plug body, the end of the plug body is provided with a sealing surface, and the sealing surface cooperates with the conical sealing surface; the outer surface of the plug body is provided with an external thread, and the external thread cooperates with the internal thread.

[0008] The further improvement of the present invention is:

[0009] The sealing surface provided at the end of the plug body is a spherical surface, and the curvature radius of the spherical surface is 1.6 to 2 times the inner diameter of the pipeline.

[0010] The further improvement of the present invention is:

[0011] The acute angle formed by the straight line connecting the point where the sealing surface contacts the conical sealing surface and the center of the sealing surface and the central axis of the plug body is 20° to 30°.

[0012] The further improvement of the present invention is:

[0013] The helix angle of the external thread does not exceed 2°.

[0014] The further improvement of the present invention is:

[0015] The number of teeth of the external thread is not less than 4 and not more than 20.

[0016] The further improvement of the present invention is:

[0017] A sealing filling layer is provided between the internal thread and the external thread.

[0018] The further improvement of the present invention is:

[0019] The plug body is provided with a first transition section between the external thread and the sealing surface.

[0020] The further improvement of the present invention is:

[0021] The length of the first transition section is 5 to 20 mm.

[0022] The further improvement of the present invention is:

[0023] A second transition section is provided in the plug hole between the internal thread and the conical sealing surface, and the position of the second transition section corresponds to that of the first transition section.

[0024] The further improvement of the present invention is:

[0025] The smoothness of the outer surface of the first transition section and the inner surface of the second transition section is not less than Ra0.8.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The utility model processes the end of the threaded plug into a sealing structure that matches the sealing surface of the pipe end, which can simultaneously achieve the functions of blocking and sealing. It is suitable for sealing the pipe ends of large-diameter pipes under ultra-high pressure, and is also suitable for sealing the pipe ends of small-diameter pipes under ultra-high pressure, solving the problem of pipe end sealing under ultra-high pressure conditions.

[0028] In the utility model, since the threaded plug is connected to the plug hole at the end of the pipeline through a thread, the pipeline end seal can be quickly disassembled and repaired, and the disassembly and assembly workload is greatly reduced; the structure is compact and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a pipe end sealing structure according to an embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a threaded plug in an embodiment of the present utility model.

[0031] In the figure,

[0032] 1. Plug the head hole;

[0033] 2. Threaded plug, 201. Plug body, 202. Sealing surface, 203. External thread, 204. First transition section;

[0034] 3. Pipeline. DETAILED DESCRIPTION

[0035] The present invention is described in further detail below with reference to the accompanying drawings:

[0036] [Example 1]

[0037] like Figure 1 As shown, the embodiment of the present invention provides a pipe end sealing structure, including a plug hole 1 and a threaded plug 2.

[0038] The plug hole 1 is provided at the end of the pipe 3, the bottom of the plug hole 1 is provided with a conical sealing surface, and the inner wall of the plug hole 1 is provided with an internal thread;

[0039] The threaded plug 2 is an integrated structure, including a plug body 201. A sealing surface 202 is provided at the end of the plug body 201. The sealing surface 202 cooperates with the conical sealing surface to simultaneously achieve the functions of sealing and plugging the end of the pipe 3; the outer surface of the plug body 201 is provided with an external thread 203, and the external thread 203 cooperates with the internal thread to achieve threaded connection and sealing between the threaded plug 2 and the plug hole 1.

[0040] The utility model can realize the functions of blocking and sealing the end of the pipeline under ultra-high pressure working conditions, and can realize the rapid disassembly and maintenance of the seal of the end of the pipeline, greatly reducing the disassembly and assembly workload; the structure is compact and cost-effective.

[0041] [Example 2]

[0042] The sealing surface 202 provided at the end of the plug body 201 is a spherical surface, and the curvature radius of the spherical surface is 1.6 to 2 times the inner diameter of the pipe. This can ensure that the threaded plug 2 completely blocks and seals the end of the pipe 3, thereby improving the sealing effect.

[0043] The acute angle formed between the straight line connecting the point where the sealing surface contacts the conical sealing surface and the center of the sealing surface and the central axis of the plug body is 20° to 30°, so that under the action of the thread preload, elastic or plastic deformation occurs at the position where the sealing surface 202 contacts the conical sealing surface to form a contact ring, ensuring that the sealing surface 202 fits tightly with the conical sealing surface, thereby ensuring the sealing effect and forming the first seal at the end of the pipeline.

[0044] Preferably, the smoothness of the sealing surface 202 and the conical sealing surface is not less than Ra0.8 to ensure the sealing effect of the contact surface.

[0045] [Example 3]

[0046] The external thread 203 provided on the outer surface of the plug body 201 is formed by turning or rolling, the helix angle of the external thread 203 does not exceed 2°, and the internal thread provided on the inner wall of the plug hole 1 matches the external thread 203 to ensure that the threaded plug 2 and the plug hole 1 are connected by threads and fit tightly. At the same time, the contact pressure between the threads can effectively prevent the leakage of the medium through the threads, thereby ensuring the sealing effect.

[0047] The number of threads of the external thread 203 is not less than 4 and not more than 20 to ensure the blocking and sealing effect.

[0048] In order to further improve the sealing effect, a sealing filling layer is set between the internal thread and the external thread 203. Specifically, during the installation process, thread sealant is filled in the gap between the internal thread and the external thread to increase the contact area of ​​the thread and improve the sealing effect.

[0049] [Example 4]

[0050] The plug body 201 is provided with a first transition section 204 between the external thread 203 and the sealing surface 202 . The length of the first transition section 204 is 5 to 20 mm.

[0051] A second transition section is provided between the internal thread and the conical sealing surface in the plug hole 1. The position of the second transition section corresponds to that of the first transition section 204. The second transition section cooperates with the first transition section 204 to play a positioning role, which facilitates the installation of the threaded plug 2.

[0052] The outer diameter of the first transition section 204 is the same as the inner diameter of the second transition section. Preferably, the gap between the outer surface of the first transition section 204 and the inner surface of the second transition section is less than 0.1 mm, and the smoothness of the outer surface of the first transition section 204 and the inner surface of the second transition section should be no less than Ra0.8 to ensure the sealing effect of the contact surface.

[0053] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0054] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0055] The above technical solution is only one implementation method of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. An ultra-high pressure pipeline end sealing structure, characterized in that: Including plug holes and threaded plugs, The plug hole is provided at the end of the pipeline, the bottom of the plug hole is provided with a conical sealing surface, and the side wall of the plug hole is provided with an internal thread; The threaded plug includes a plug body, the end of the plug body is provided with a sealing surface, and the sealing surface cooperates with the conical sealing surface; the outer surface of the plug body is provided with an external thread, and the external thread cooperates with the internal thread.

2. The ultra-high pressure pipeline end sealing structure according to claim 1, characterized in that: The sealing surface provided at the end of the plug body is a spherical surface, and the curvature radius of the spherical surface is 1.6 to 2 times the inner diameter of the pipeline.

3. The ultra-high pressure pipeline end sealing structure according to claim 2, characterized in that: The acute angle formed by the straight line connecting the point where the sealing surface contacts the conical sealing surface and the center of the sealing surface and the central axis of the plug body is 20° to 30°.

4. The ultra-high pressure pipeline end sealing structure according to claim 1, characterized in that: The helix angle of the external thread does not exceed 2°.

5. The ultra-high pressure pipeline end sealing structure according to claim 1 or 4, characterized in that: The number of teeth of the external thread is not less than 4 and not more than 20.

6. The ultra-high pressure pipeline end sealing structure according to claim 1, characterized in that: A sealing filling layer is provided between the internal thread and the external thread.

7. The ultra-high pressure pipeline end sealing structure according to claim 1, characterized in that: The plug body is provided with a first transition section between the external thread and the sealing surface.

8. The ultra-high pressure pipeline end sealing structure according to claim 7, characterized in that: The length of the first transition section is 5 to 20 mm.

9. The ultra-high pressure pipeline end sealing structure according to claim 7, characterized in that: A second transition section is provided in the plug hole between the internal thread and the conical sealing surface, and the position of the second transition section corresponds to that of the first transition section.

10. The ultra-high pressure pipeline end sealing structure according to claim 9, characterized in that: The smoothness of the outer surface of the first transition section and the inner surface of the second transition section is not less than Ra0.8.

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