Sealing flange convenient for pipeline connection for petroleum wellhead

Abstract

The utility model relates to the technical field of flanges, in particular to a petroleum wellhead sealing flange convenient for pipeline connection, which comprises a sealing flange body, a plurality of bolt holes are arranged on the surface of the sealing flange body, rubber sleeves are inserted into the bolt holes, and rubber clamping rings are integrally formed in the rubber sleeves. A reserved groove is formed in the outer ring face of the sealing flange body, a limiting cover is arranged in the reserved groove in a sleeved mode, a screw rod is inserted into the surface of the limiting cover and fixed in the reserved groove, and a nut is arranged on a rod body of the screw rod in a sleeved and screwed mode. The sealing structure has the beneficial effects that the super-thick sealing gasket is matched with the annular embedding groove, so that the sealing gasket is always centered in the compression process, and unbalance loading is avoided; an I-shaped rubber sleeve and a rubber clamping ring protruding in the middle are arranged in a bolt hole, and the bolt is bidirectionally limited through elastic deformation; an annular reserved groove is formed in the outer ring face and matched with an L-shaped section limiting cover, and mechanical clamping after flange butt joint is achieved.

Description

Technical Field

[0001] This utility model relates to the field of flanges, specifically a sealing flange for oil wellheads that facilitates pipeline connection. Background Technology

[0002] In the field of oil wellhead pipeline connections, traditional sealing flanges have the following technical drawbacks:

[0003] Insufficient sealing reliability: The gaskets of conventional flanges are prone to displacement due to vibration or pressure fluctuations, and the compression is difficult to control, which increases the risk of seal failure.

[0004] Lack of bolt anti-loosening mechanism: Traditional bolt holes lack limit design. If the nut is not tightened in time during installation, the bolt is easy to fall out of the hole, causing safety hazards.

[0005] Low installation efficiency: When connecting pipes, external tooling is required for temporary fixation, which is difficult and time-consuming, especially in high-altitude or narrow working environments.

[0006] Poor structural stability: Lacking a pre-limiting device, the pipeline may accidentally detach due to external forces (such as wind or vibration) when the bolts are not fully tightened, threatening operational safety. Utility Model Content

[0007] The purpose of this invention is to provide a sealing flange for oil wellheads that facilitates pipeline connection, in order to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sealing flange for easy pipeline connection at oil wellheads, comprising a sealing flange body, multiple bolt holes on the surface of the sealing flange body, a rubber sleeve inserted into the bolt holes, a rubber clamping ring integrally formed inside the rubber sleeve, a reserved groove on the outer circumferential surface of the sealing flange body, a limiting cover fitted inside the reserved groove, a screw inserted into the surface of the limiting cover, the screw fixed in the reserved groove, and a nut screwed onto the shank of the screw. Preferably, both sides of the sealing flange body have an insert groove, the insert groove is annular, a sealing gasket is fixed inside the insert groove, the thickness of the sealing gasket is greater than the depth of the insert groove, and the sealing gasket has an annular plate structure.

[0009] Preferably, both ends of the bolt hole are provided with side grooves, which are annular grooves, and the rubber sleeve is in the shape of an "I".

[0010] The rubber sleeve is fixed at both ends of the U-shaped round tube in the two side grooves at both ends of the bolt hole.

[0011] Preferably, the rubber clamp has a ring structure, and the rubber clamp protrudes inward from both ends to the middle.

[0012] Preferably, the reserved groove is an annular groove, the limiting cover is a circular ring structure with an L-shaped cross section, two through holes are formed on the surface of the limiting cover, and a screw rod is inserted into each of the two through holes and fixed at two parallel sidewalls of the reserved groove.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The sealing flange convenient for pipeline connection for oil well heads has the advantages that: the cooperation of the ultra-thick sealing gasket and the annular embedding groove ensures that the sealing gasket is always centered during compression and avoids eccentric load; the I-shaped rubber sleeve and the rubber clamping ring protruding in the middle are arranged in the bolt hole to bi-directionally limit the bolt through elastic deformation; the annular reserved groove is arranged on the outer ring surface to realize mechanical clamping after the flanges are butted through cooperation with the L-shaped cross section limiting cover. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model;

[0016] Figure 2 It is a structural side view of the utility model;

[0017] Figure 3 It is Figure 2 It is a structural sectional view of A-A;

[0018] Figure 4 It is Figure 3 It is an enlarged schematic view of A;

[0019] Figure 5 It is a structural schematic view of the utility model after the limiting cover is extended;

[0020] Figure 6 It is Figure 5 It is an enlarged schematic view of B.

[0021] In the drawing: sealing flange body 1, embedding groove 2, sealing gasket 3, bolt hole 4, edge groove 5, rubber sleeve 6, rubber clamping ring 7, reserved groove 8, limiting cover 9, through hole 10, screw rod 11, nut 12. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme of the utility model clear, complete and the advantages more clear and apparent, the following will be further described in detail by combining the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the utility model, not all the embodiments, and are only used to explain the embodiments of the utility model, and do not limit the embodiments of the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] Please see Figures 1-6 This utility model provides a technical solution: a sealing flange for easy pipeline connection at an oil wellhead, comprising a sealing flange body 1, with an insertion groove 2 on both sides of the sealing flange body 1. The insertion groove 2 is an annular groove, and a sealing gasket 3 is fixed inside the insertion groove 2. The thickness of the sealing gasket 3 is greater than the depth of the insertion groove 2, and the sealing gasket 3 has an annular plate structure. Multiple bolt holes 4 are provided on the surface of the sealing flange body 1. The sealing flange body 1 is fitted and fixed to the end of the oil wellhead pipeline. Both pipelines that need to be connected are fitted with the sealing flange body 1. The two sealing flange bodies 1 are fixed together with bolts to achieve the connection and fixation of the two pipelines together.

[0024] A rubber sleeve 6 is inserted into the bolt hole 4. A rubber clamping ring 7 is integrally formed inside the rubber sleeve 6. Both ends of the bolt hole 4 are provided with side grooves 5, which are annular grooves. The rubber sleeve 6 is an "I"-shaped round tube. The two ends of the rubber sleeve 6 are respectively fixed in the two side grooves 5 at both ends of the bolt hole 4. The rubber clamping ring 7 has an annular structure and protrudes inward from both ends to the middle. The reason for installing the rubber sleeve 6 and the rubber clamping ring 7 inside the bolt hole 4 is to limit the bolt inserted into the bolt hole 4. That is, when the bolt is not locked and after the bolt passes through the bolt hole 4, the bolt will not fall out of the bolt hole 4.

[0025] A pre-reserved groove 8 is provided on the outer circumferential surface of the sealing flange body 1. A limiting cover 9 is fitted inside the pre-reserved groove 8. A screw 11 is inserted into the surface of the limiting cover 9 and fixed in the pre-reserved groove 8. A nut 12 is screwed onto the body of the screw 11. The pre-reserved groove 8 is an annular groove, and the limiting cover 9 is an L-shaped annular structure. Two through holes 10 are provided on the surface of the limiting cover 9. A screw 11 is inserted into each of the two through holes 10. The two ends of the screw 11 are fixed to two parallel side walls of the pre-reserved groove 8. The reason for adding the limiting cover 9 is that when two sealing flange bodies 1 are close together, the limiting cover 9 can be moved to fit onto the adjacent sealing flange body 1 that does not have the limiting cover 9 installed. At this time, the two sealing flange bodies 1 are not connected by bolts, and the pipeline will not fall off. This achieves the pre-limiting of the pipelines with the two sealing flange bodies 1 installed. Then, the bolts are passed through the bolt holes 4 on the surface of the two sealing flange bodies 1 and locked.

[0026] The detailed usage procedure for sealing flanges at oil wellheads is as follows:

[0027] Confirm that the sealing flange body 1 has no cracks, deformation, and the sealing gasket 3 in the embedded groove 2 is intact (the thickness needs to be greater than the groove depth to ensure the sealing property). Check whether the rubber sleeve 6 and the rubber clamp ring 7 are firmly embedded in the bolt hole 4, and whether the side groove 5 is clean without foreign matter. Verify that the screw rod 11 of the limiting cover 9 cooperates well with the nut 12, and that the reserved groove 8 has no rust. Clean the end face of the petroleum wellhead pipeline to ensure that there is no oil stain, burr or damage, and ensure that the contact surface with the sealing gasket 3 is flat.

[0028] Put the sealing flange body 1 into the end of the pipeline, and ensure that the embedded groove 2 is vertically aligned with the end face of the pipeline. Permanently fix the flange body 1 on the pipeline by welding or clamp (select the fixing method according to the pressure grade of the wellhead). Repeat the above steps for the other pipeline to be connected to ensure that the bolt holes 4 of the two flanges are uniformly distributed, and the reserved grooves 8 are opposite (to facilitate the subsequent nesting of the limiting cover 9). Slowly close the two pipelines to make the sealing gaskets 3 of the two flange bodies 1 contact each other and ensure the axis concentricity. Turn the limiting cover 9 of one side flange (turn in the reserved groove 8 through the screw rod 11) to make its "L" shaped section nest into the reserved groove 8 of the other side flange. The flange body 1 of the other side without the limiting cover needs to have the reserved groove 8 upward to facilitate the nesting. Effect: At this time, the two flanges are mechanically clamped through the limiting cover 9, and even if the bolt is not installed, the pipeline will not fall off. Pass the bolt through the aligned bolt holes 4 of the two flanges in turn, and fix the bolt by using the elastic contraction of the rubber clamp ring 7 (the bolt will not fall off when it is not locked). Diagonal pre-tightening: preliminarily tighten the nut in the order of the diagonal line to uniformly compress the sealing gasket 3. Recheck the alignment: check the flange concentricity again to avoid the partial load leading to the sealing failure. Lock all the bolts symmetrically and uniformly according to the specified torque (determined according to the flange specification and the pipeline pressure grade) to ensure that the parallelism of the flange end face is ≤0.1mm / m.

[0029] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing flange for easy pipe connection of oil wellheads, comprising a sealing flange body (1), the surface of the sealing flange body (1) is provided with a plurality of bolt holes (4), characterized in that: A rubber sleeve (6) is inserted inside the bolt hole (4). A rubber clamping ring (7) is integrally formed inside the rubber sleeve (6). A reserved groove (8) is opened on the outer ring surface of the sealing flange body (1). A limiting cover (9) is fitted inside the reserved groove (8). A screw (11) is inserted on the surface of the limiting cover (9). The screw (11) is fixed in the reserved groove (8), and a nut (12) is screwed onto the rod of the screw (11).

2. A sealing flange for facilitating pipe connection to a petroleum well head as claimed in claim 1, characterized in that: The sealing flange body (1) has an insert groove (2) on both sides. The insert groove (2) is an annular groove. A sealing gasket (3) is fixed inside the insert groove (2). The thickness of the sealing gasket (3) is greater than the depth of the insert groove (2). The sealing gasket (3) has an annular plate structure.

3. A sealing flange for facilitating pipe connection to a petroleum well head as claimed in claim 1, wherein: Both ends of the bolt hole (4) are provided with side grooves (5), which are annular grooves. The rubber sleeve (6) is an "I" shaped round tube, and the two ends of the rubber sleeve (6) are respectively fixed in the two side grooves (5) at both ends of the bolt hole (4).

4. A sealing flange for facilitating pipe connection to a petroleum well head as claimed in claim 1, wherein: The rubber clamp (7) has a ring structure and protrudes inward from both ends to the middle.

5. A sealing flange for facilitating pipe connection to a petroleum well head as claimed in claim 1, wherein: The reserved groove (8) is an annular groove, and the limiting cover (9) is an annular structure with an "L" shaped cross section. Two through holes (10) are opened on the surface of the limiting cover (9), and screws (11) are inserted into the two through holes (10). The two ends of the screws (11) are respectively fixed on the two parallel side walls of the reserved groove (8).

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