阅读说明：本技术 一种高压自紧式管道封堵装置 (High-pressure self-tightening pipeline plugging device ) 是由 黄贤滨 单广斌 潘隆 刘艳 于 2019-10-08 设计创作，主要内容包括：本发明属于管道配件技术领域,涉及一种用于管道管端的封闭装置。一种高压自紧式管道封堵装置,包括拉紧杆、密封环、管端套筒,所述管端套筒套装在管道的端部；所述拉紧杆设置于所述管端套筒的内部；所述的密封环套在拉紧杆的外部,其内环与拉紧杆外壁贴合,其外环与管道的内壁贴合；所述拉紧杆通过旋转自紧作用于密封环实现管端密封。本发明的高压自紧式管道封堵装置,用于工业管道和其他日常管道的管口封堵,结构简单,拆装方便,密封牢固,可适用于大部分管道。(The invention belongs to the technical field of pipe fittings, and relates to a sealing device for a pipe end of a pipeline. A high-pressure self-tightening pipeline plugging device comprises a tensioning rod, a sealing ring and a pipe end sleeve, wherein the pipe end sleeve is sleeved at the end part of a pipeline; the tensioning rod is arranged inside the pipe end sleeve; the sealing ring is sleeved outside the tensioning rod, the inner ring of the sealing ring is attached to the outer wall of the tensioning rod, and the outer ring of the sealing ring is attached to the inner wall of the pipeline; the tensioning rod acts on the sealing ring through rotation self-tightening to realize pipe end sealing. The high-pressure self-tightening pipeline plugging device is used for plugging the pipe orifices of industrial pipelines and other daily pipelines, has a simple structure, is convenient to disassemble and assemble, is firm in sealing, and can be suitable for most pipelines.)

1. The utility model provides a high pressure self-clinching formula pipeline plugging device which characterized in that: comprises that

The pipe end sleeve is sleeved at the end part of the pipeline;

the tensioning rod is arranged inside the pipe end sleeve;

the sealing ring is sleeved outside the tension rod, the inner ring of the sealing ring is attached to the outer wall of the tension rod, and the outer ring of the sealing ring is attached to the inner wall of the pipeline;

the tensioning rod acts on the sealing ring through rotation self-tightening to realize pipe end sealing.

2. The high pressure, self-tightening, pipeline plugging device of claim 1, wherein: the pipe end sleeve consists of an inner cylinder and an outer cylinder, the end part of the outer cylinder, which is positioned at the tail end of the pipeline, is a closed end, and the tensioning rod is arranged in the inner cylinder.

3. The high pressure self-tightening pipe plugging device of claim 2, wherein: the tensioning rod is divided into a cylindrical section and a conical section, and the sealing ring is sleeved on the conical section.

4. The high pressure self-tightening pipe plugging device of claim 3, wherein: the tail end of the cylindrical section is provided with an external thread, and the external thread is connected with a nut or a pipe end sleeve.

5. The high pressure self-tightening pipe plugging device of claim 2, wherein: the inner diameter of the outer cylinder is 1.01 times of the outer diameter of the pipeline.

6. The high pressure self-tightening pipe plugging device of claim 3, wherein: the outer diameter of the inner cylinder is 0.85 times of the inner diameter of the pipeline, and the inner diameter of the inner cylinder is 1.1 times of the diameter of the cylindrical section of the tension rod.

7. The high pressure self-tightening pipe plugging device of claim 4, wherein: the length of the tension rod is not less than that of the outer cylinder; and the external thread of the tightening rod protrudes at least partially from the end face of the pipe end sleeve.

8. The high pressure self-tightening pipe plugging device of claim 3, wherein: the length of the inner cylinder is smaller than that of the tension rod.

9. The high pressure, self-tightening pipe plugging device of claim 8, wherein: the tail end of the inner cylinder is in contact with a sealing ring sleeved on the conical section.

10. The high pressure, self-tightening, pipeline plugging device of claim 9, wherein: the number of the sealing rings is not less than two.

11. The high pressure, self-tightening, pipeline plugging device of claim 10, wherein: the outer diameters of the at least two groups of sealing rings are the same, and the inner diameters of the at least two groups of sealing rings are changed along the diameter change of the conical section of the tightening rod.

12. The high pressure, self-tightening, pipeline plugging device of claim 11, wherein: the maximum inner ring diameter of the sealing ring is smaller than the maximum diameter of the conical section of the tensioning rod.

13. The high pressure, self-tightening, pipeline plugging device of any one of claims 1-12, wherein: the sealing ring is a solid metal annular gasket.

14. The high pressure, self-tightening, pipeline plugging device of any one of claims 2-12, wherein: and an arc chamfer is arranged on the inner side of the opening end of the outer barrel.

15. The high pressure, self-tightening, pipeline plugging device of any one of claims 2-12, wherein: the outer wall of the inner cylinder is a conical surface.

Technical Field

The invention belongs to the technical field of pipe fittings, and relates to a sealing device for a pipe end of a pipeline.

Background

In petroleum and petrochemical production, pipelines need to be plugged when the process is changed. Because the material is flammable and explosive, the requirement on the sealing performance of the plug for sealing the end part of the pipeline is high, and sometimes the plug cannot be plugged in a welding mode. In the prior art, the pipe end sealing is realized by the main blind plate plugging modes of the pipeline and the like, and the problems of unreliable sealing performance, poor connection stability, complex installation, difficult disassembly and the like exist. The plug, also called pipe cap, as the pipeline medium shutoff, prevent the instrument of pipeline medium outflow, current plug through threaded connection or welded fastening on the pipeline, generally need to polish to the pipeline opening, tapping, mantle fiber or welding etc. mode just can realize sealed, to operating space narrow, the operation of working on fire is implemented difficultly, under the short many condition restriction environment of operating time, the operation such as tapping, welding of being not convenient for more is dismantled the inspection.

In order to solve the above problems, CN203809948U discloses a novel pipe and plug sealing connection structure, as shown in fig. 1, a tapered sealing rubber gasket and an end flat gasket are adopted, and are connected with the pipe plug by screwing a nut, so as to extrude the tapered sealing rubber gasket and the end flat gasket to form a seal with the pipe. The plug can be installed quickly without firing operation. However, the sealing connection structure for the pipeline and the plug disclosed in CN203809948U is poor in sealing performance and weak in connection fixation firmness, and although the tapered sealing rubber pad and the end flat pad have sealing and anti-slip effects, the tapered inclined direction of the tapered sealing rubber pad and the end flat pad is arranged towards the direction of the pipe orifice, so that self-locking cannot be formed.

CN207179029U discloses a self-locking industrial pipe sealing plug, as shown in fig. 2, two thread sleeves are designed, and by screwing down the pipe plug, the axial force acting on the pipe plug is converted into the pressure on the clasping ring, thereby realizing the sealing of the pipe, having a certain self-tightening function, and being convenient for dismounting in the environment with narrow space and high requirement. However, the pipe sealing plug disclosed in CN207179029U mainly relies on the sealing material in the sealing groove 211 and the internal thread sleeve connected with the pipe plug to form sealing at the plug side, and has the disadvantages of complex structure, large plug volume, high processing precision, high requirement for coaxiality of the sealed pipe, low gasket sealing specific pressure, and difficulty in being used in high-pressure environment.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a high-pressure self-tightening type pipeline plug which is simple in structure, convenient to install and disassemble and capable of achieving quick plugging of a pipeline.

The technical scheme adopted by the invention for solving the technical problems is as follows: a high pressure self-tightening pipe plugging device comprising:

the pipe end sleeve is sleeved at the end part of the pipeline;

the tensioning rod is arranged inside the pipe end sleeve;

the sealing ring is sleeved outside the tension rod, the inner ring of the sealing ring is attached to the outer wall of the tension rod, and the outer ring of the sealing ring is attached to the inner wall of the pipeline;

the tensioning rod acts on the sealing ring through rotation self-tightening to realize pipe end sealing.

In a preferred embodiment of the present invention, the pipe end sleeve is composed of an inner cylinder and an outer cylinder, the outer cylinder is located outside the pipeline, and the inner cylinder is located inside the pipeline; the end part of the outer cylinder, which is positioned at the tail end of the pipeline, is a closed end, the other end of the outer cylinder is an open end, and the tensioning rod is arranged in the inner cylinder.

As a further improvement of the invention, the inner diameter of the outer cylinder is 1.01 times of the outer diameter of the pipeline, the outer diameter of the inner cylinder is 0.85 times of the inner diameter of the pipeline, and the inner diameter of the inner cylinder is 1.1 times of the diameter of the tension rod.

As a preferable mode of the invention, the tension rod is divided into a cylindrical section and a conical section, and the tail end of the cylindrical section is provided with an external thread; the sealing ring is sleeved on the conical section; the external thread is connected with the screw cap or the pipe end sleeve.

As a preferable mode of the present invention, the length of the tension bar is not less than the length of the outer cylinder; and the external thread of the tightening rod protrudes at least partially from the end face of the pipe end sleeve.

In a preferred embodiment of the present invention, the length of the inner cylinder is smaller than the length of the tension rod.

In a preferred mode of the invention, the end of the inner cylinder is in contact with a sealing ring sleeved on the conical section.

In a preferred mode of the invention, the number of the sealing rings is not less than two.

In a preferred mode of the invention, the outer diameters of the at least two sets of sealing rings are the same, and the inner diameter of the at least two sets of sealing rings varies along the diameter variation of the tapered section of the tightening rod.

In a preferred form of the invention, the maximum inner ring diameter of the sealing ring is smaller than the maximum diameter of the tapered section of the tightening rod.

In a preferred embodiment of the present invention, the sealing ring is a solid metal annular gasket.

In a preferred aspect of the present invention, an arc chamfer is provided on an inner side of the open end of the outer cylinder.

In a preferred embodiment of the present invention, the outer wall of the inner cylinder has a tapered surface.

According to the high-pressure self-tightening pipeline plugging device, the tightening rod compresses the outer ring of the sealing ring on the inner wall of the pipeline and compresses the inner ring of the sealing ring on the outer wall of the tightening rod through rotation self-tightening, so that the end of the pipeline is sealed.

The high-pressure self-tightening pipeline plugging device is used for plugging the pipe orifices of industrial pipelines and other daily pipelines, has a simple structure, is convenient to disassemble and assemble, is firm in sealing, and is suitable for most pipelines.

Drawings

FIG. 1 is a schematic cross-sectional view of the high pressure self-tightening pipeline plugging device of the present invention taken along the axial direction of a pipeline;

FIG. 2 is a cross-sectional view of the pipe end sleeve;

fig. 3 is a schematic view of a tension bar.

Detailed Description

The high-pressure self-tightening pipeline plugging device is described in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the high-pressure self-tightening pipeline plugging device of the present embodiment includes a tightening rod 1, a sealing ring 2, and a pipe end sleeve 3. The pipe end sleeve 3 is composed of an inner cylinder 31 and an outer cylinder 32, the pipe end sleeve 3 is installed at the end of the pipeline body 4, the outer cylinder 32 is located outside the pipeline body 4, and the inner cylinder 31 is located inside the pipeline body 4. As shown in fig. 2, the end of the outer cylinder 32 located at the end of the duct body 4 is a closed end, and the other end is an open end 33. The inner cylinder 31 is open at both ends, and the opening at one end is connected with the hole 34 on the pipe end sleeve 3. The hole 34 in the middle of the pipe end sleeve 3 is a smooth hole or a threaded hole.

The tension rod 1 is installed inside the inner cylinder 31. As shown in fig. 3, the tension rod 1 consists of a cylindrical section 11 and a conical section 12, with an external thread 13 being provided at the end of the cylindrical section 11. The external thread 13 is used for mounting the screw cap 5.

In a more preferred embodiment, instead of using a nut to connect to the external thread, an internal thread may be provided in the bore 34 of the ferrule 3 and may be engaged with the external thread 13 on the tightening rod 1 to achieve rotational self-tightening of the tightening rod 1.

The sealing ring 2 is sleeved outside the conical section 12 of the tension rod 1. The outer ring of the sealing ring 2 is attached to the inner surface of the pipe body 4. Because the diameter of the conical section 12 of the tension rod 1 is gradually increased inwards along the axial direction of the pipeline, the diameter of the inner ring of the sealing ring 2 is gradually increased, but the diameter of the outer ring of all the sealing rings is kept unchanged, and the inner diameters of all the sealing rings are in an arithmetic progression. And the maximum inner ring diameter of the sealing ring is smaller than the maximum diameter of the conical section of the tensioning rod, so that the last sealing ring can be prevented from falling off from the conical section.

In a preferred embodiment, the number of seal rings 2 is determined according to actual needs, and is generally 2 or more. The sealing ring 2 is a solid metal annular gasket, and the cross section of the sealing ring 2 is circular or elliptical.

The length of the tension rod 1 is greater than or equal to the length of the outer cylinder 32 of the ferrule 3. The radius of the bottom surface of the conical section 12 of the tension rod 1 is slightly smaller than the inner diameter of the pipe body 4. The cylindrical section 11 of the tightening rod 1 protrudes outward beyond the end face of the pipe end sleeve 3, so that the external thread 13 is exposed to facilitate the installation and tightening of the nut 5. When the external thread 13 of the tightening rod 1 is screwed into the hole 34 of the pipe end sleeve 3, the external thread 13 does not need to protrude from the end surface of the pipe end sleeve 3, as long as at least partial threaded connection between the external thread 13 and the hole 34 is ensured, so that the tightening rod 1 can rotate under self-tightening.

In order to limit the outward axial displacement of the sealing ring 2 along the pipeline, in the embodiment, the length of the inner cylinder 31 is smaller than that of the tension rod 1, and the end of the cylinder wall of the inner cylinder 31 is contacted with the sealing ring 2. Under the jacking action of the inner cylinder 31, the sealing ring 2 is constrained on the tapered section of the tightening rod.

The inner diameter of the outer cylinder 32 of the pipe end sleeve 3 is slightly larger than the outer diameter of the pipeline body 4, in the embodiment, the inner diameter of the outer cylinder 32 is 1.01 times of the outer diameter of the pipeline body 4, the outer diameter of the inner cylinder 31 is 0.85 times of the inner diameter of the pipeline body 4, and the inner diameter of the inner cylinder 32 is 1.1 times of the diameter of the tensioning rod cylindrical section 11.

The pipe diameter of the pipe body 4 is increased under the action of the sealing ring 2, the inner side of the outer cylinder 32 of the pipe end sleeve is in close contact with the outer side of the pipe body 4, the transition deformation of the pipe body 4 is limited, and the sealing effect of the sealing ring is guaranteed. Further, for the sleeve attachment, a round chamfer 35 is provided inside the open end 33 of the outer cylinder 32 of the ferrule 3.

The outer wall of the inner cylinder 31 of the pipeline sleeve 3 is a conical surface, and a certain sealing specific pressure is formed between the conical surface of the inner cylinder 31 and the inner surface of the pipeline body 4 to form a low-pressure sealing structure.

The high-pressure self-tightening pipeline plugging device of the embodiment adopts the self-tightening principle that:

(1) the tension rod 1 is inserted into the pipeline body 4;

(2) sequentially sleeving the sealing rings 2 on the tensioning rod 1 according to the diameter of the inner ring;

(3) moving the sealing ring 2 onto the conical section 12 of the tightening rod 1 so that the sealing ring 2 is in place for the first time;

(4) sleeving the pipe end sleeve 3 at the end part of the pipeline body 4, enabling the tensioning rod 1 to penetrate through a hole 34 in the middle of the pipe end sleeve 3 and expose the external thread 13, and enabling the sealing ring 2 to be in place for the second time under the jacking action of the inner cylinder 31 of the pipe end sleeve 3;

(5) a nut 5 is arranged on the external thread 13 of the tightening rod 1, and after the bolt is tightened according to the calculated pretightening force, the sealing ring 2, the pipeline body 4 and the tightening rod 1 form initial sealing;

(6) after the inner wall of the pipeline body 4 is pressed by the sealing ring, the end face of the tension rod 1 is pressed by the axial force towards the outside of the pipeline, the sealing specific pressure between the sealing ring 2 and the tension rod 1 as well as between the seal rod and the pipeline body 4 is further increased, the outer wall of the pipeline body 4 is tightly attached to the outer cylinder 32, and self-tightening sealing is realized.