Sealing leather cup for oil and gas conveying pipeline

Abstract

A sealing leather cup for an oil and gas pipeline belongs to the field of sealing equipment. Comprising a base and a connecting part, and the upper end of the base is fixedly connected with the connecting part; a plurality of protrusions are fixedly connected to the upper end of the outer side circular face of the connecting part in the circumferential direction of the connecting part. And an annular sealing ring is arranged at the joint of the base and the connecting part. The spiral protrusions are additionally arranged in the circumferential direction of the leather cup to cater to a welding seam, meanwhile, the sealing performance of the position of the welding seam is improved through the ductility of the protrusions, the sealing capacity of the leather cup on a local micro seam is improved, the sealing difficulty of an air pipeline is reduced, and safety is improved.

Description

Technical Field

[0001] The utility model relates to a sealing leather cup for oil and gas pipelines, belonging to the field of sealing equipment. Background Technique

[0002] The sealing leather cup is the main seal for opening, plugging and repairing oil and gas pipelines. After the pipeline is opened, it is sent into the pipeline through a plugging device to block and seal the pipeline medium. The sealing leather cup has a good performance in the plugging application of liquid media such as crude oil and refined oil. With the large-scale development of natural gas in the country, gas pipelines have been laid across the country, so the demand for maintenance equipment for gas pipelines has gradually increased. Gas media are different from liquid media. Because their molecular weight is much smaller than that of liquid media, the requirements for sealing are higher.

[0003] In pipelines for transporting oil and natural gas, when the pipeline diameter is greater than DN300, the rolled plate process is usually used for production and manufacturing. The pipelines produced in this way often have an obvious weld seam on the inner and outer walls of the pipeline. The weld seams usually include straight weld seams and spiral weld seams, and spiral weld seam pipes are more common in pipeline applications. When the pipe diameter is greater than DN500, double-welded seams will also appear. Such weld seams are more convex due to the weld beads, making the sealing more difficult.

[0004] In the disc plugging, the outer circle of the leather cup needs to be closely attached to the inner wall of the pipeline to achieve sealing. However, the weld seam bulges inside the pipe, which will cause the leather cup to be lifted when the sealing leather cup fits with the inner wall of the pipeline due to the local bulge of the weld seam. Due to the physical properties of the hardness and ductility of the leather cup itself, there will be micro-cracks locally when it fits with the inner wall of the pipeline. This micro-crack can be ignored in the plugging of liquid media, but in the plugging of gas media, due to the small molecular weight of the media, it will pass through the micro-crack, resulting in local micro-leakage and potential safety hazards. In view of this problem, we have modified the original leather cup structure. Content of the Utility Model

[0005] The purpose of the utility model is to solve the above problems existing in the background technique and provide a sealing leather cup for oil and gas pipelines.

[0006] The utility model realizes the above purpose and adopts the following technical solutions:

[0007] A sealing leather cup for oil and gas pipelines includes a base and a connecting part. The upper end of the base is fixedly connected with the connecting part; a plurality of protrusions are fixedly connected along the circumferential direction of the upper end of the outer circular surface of the connecting part; an annular sealing ring is arranged at the connection between the base and the connecting part.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: By adding spiral protrusions in the circumferential direction of the leather cup to accommodate the weld seam, and at the same time improving the sealing performance at the weld seam position through the ductility of the protrusions, the sealing ability of the leather cup at local micro-seams is improved, reducing the sealing difficulty of the gas pipeline and enhancing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is the front view of a sealing leather cup for an oil and gas transportation pipeline of the present utility model;

[0010] Figure 2 is the schematic diagram of the position of the sealing ring of a sealing leather cup for an oil and gas transportation pipeline of the present utility model;

[0011] Figure 3 is the cross-sectional view of a sealing leather cup for an oil and gas transportation pipeline of the present utility model.

[0012] In the figure: 1, base; 2, connecting part; 3, sealing ring; 4, protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0014] Specific Embodiment 1: As Figures 1-3 shown, this embodiment describes a sealing leather cup for an oil and gas transportation pipeline, including a base 1 and a connecting part 2. The upper end of the base 1 is fixedly connected with the connecting part 2; a plurality of protrusions 4 are fixedly connected along the circumferential direction of the upper end of the outer circular surface of the connecting part 2; an annular sealing ring 3 is arranged at the connection between the base 1 and the connecting part 2. The main function of the sealing ring 3 is to achieve sealing with sufficient interference here.

[0015] The material of the base 1 is nitrile rubber composite with cloth, and the structure is to enable the leather cup to have sufficient strength during the friction process and avoid tearing the leather cup under the huge friction force during the feeding process of the leather cup.

[0016] The material of the connecting part 2 is nitrile rubber, in order to improve the ductility of the leather cup so that it still has good sealing performance when there are defects in the inner sealing surface of the pipeline.

[0017] The included angle between the protrusion 4 and the horizontal plane is 50° - 75°. The direction and angle of the protrusion 4 are the same as those of the spiral weld of the pipeline, and it can be closely attached to the spiral weld to solve the problem of micro-leakage of the gas medium at the weld seam.

[0018] Each of the protrusions 4 is conical.

[0019] The diameter of the cross-section of one end of each protrusion 4 close to the base 1 is greater than the diameter of the cross-section of the end away from the base 1.

[0020] The multiple protrusions 4 are evenly distributed on the outer circumferential surface of the connecting portion 2.

[0021] The direction and angle of the protrusion 4 are the same as those of the spiral weld of the pipeline, and can be closely attached to the spiral weld, thereby solving the problem of micro-leakage of the gas medium at the weld.

Claims

1. A sealing cup for oil and gas pipeline, characterized in that: The invention comprises a base (1) and a connecting part (2), wherein the upper end of the base (1) is fixedly connected to the connecting part (2); the upper end of the outer circular surface of the connecting part (2) is fixedly connected to a plurality of protrusions (4) along its circumferential direction; and an annular sealing ring (3) is provided at the connection between the base (1) and the connecting part (2).

2. The sealing cup for oil and gas pipeline according to claim 1, characterized in that: The base (1) is made of a composite cloth-reinforced nitrile rubber.

3. The sealing cup for oil and gas pipeline according to claim 2, characterized in that: The material of the connecting part (2) is nitrile rubber.

4. A sealing leather cup for oil and gas pipeline according to claim 1 or 3, characterized in that: The angle between the protrusion (4) and the horizontal plane is 50°-75°.

5. The sealing cup for oil and gas pipeline according to claim 4, characterized in that: Each of the protrusions (4) is cone-shaped.

6. The sealing cup for oil and gas pipeline according to claim 5, characterized in that: The diameter of the cross section of each protrusion (4) at one end close to the base (1) is larger than the diameter of the cross section at one end away from the base (1).

7. The sealing cup for oil and gas pipeline according to claim 6, characterized in that: The plurality of protrusions (4) are evenly distributed on the outer circumferential surface of the connecting portion (2).

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