Pipeline connecting flange

Abstract

The utility model discloses a pipeline connecting flange which comprises a fixed flange plate and a loose flange plate, the primary sides, away from each other, of the fixed flange plate and the loose flange plate are fixedly connected with flange necks, and a metal spiral wound gasket is arranged between the fixed flange plate and the loose flange plate. Flange holes are formed in the fixed flange plate and the loose flange plate correspondingly, through holes are formed in the metal spiral wound gasket, fixing bolts are arranged between the flange holes and the through holes, and a threaded block is fixedly connected to one side of the fixed flange plate. One end of the fixing bolt extends into the threaded block and is in threaded connection with the inner wall of the threaded block. Rapid centering is achieved through sliding fit of the L-shaped positioning clamping block and the locking groove, precise pre-alignment can be completed before bolt fastening in combination with secondary positioning of the sealing embedded ring and the embedded groove, and the installation efficiency is remarkably improved; and meanwhile, the positioning block is matched with the positioning hole of the metal spiral-wound gasket to prevent the gasket from deflecting and ensure that the sealing surface is uniformly pressed.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection technology, specifically a pipeline connection flange. Background Technology

[0002] Pipe connections are a crucial component of industrial piping systems, aiming to achieve secure connections and seals between different pipes or equipment. Common pipe connection methods include welding, threaded connections, and flange connections. Among these, flange connections are widely used in various piping systems due to their ease of installation, quick disassembly, and wide applicability.

[0003] Existing flanges present alignment difficulties during installation, especially in confined spaces where bolt hole misalignment can lead to poor sealing. Furthermore, conventional sealing structures (such as flat gaskets) are prone to creep failure under pipe vibration or thermal expansion and contraction conditions, requiring frequent maintenance. To address these issues, we propose a new type of pipe connection flange. Utility Model Content

[0004] The purpose of this invention is to provide a pipe connection flange to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipe connection flange, comprising a fixed flange and a loose flange, wherein flange necks are fixedly connected to the opposite sides of the fixed flange and the loose flange, a metal spiral wound gasket is provided between the fixed flange and the loose flange, flange holes are provided inside the fixed flange and the metal spiral wound gasket is provided with a through hole, a fixing bolt is provided between the flange hole and the through hole, a threaded block is fixedly connected to one side of the fixed flange, and one end of the fixing bolt extends into the interior of the threaded block and is threadedly connected to its inner wall.

[0006] As a further preferred embodiment of this technical solution, an L-shaped positioning block is fixedly connected to one side of the fixed flange, and a locking groove is provided on one side of the loose flange. One end of the L-shaped positioning block extends into the interior of the locking groove and is slidably connected to its inner wall.

[0007] As a further preferred embodiment of this technical solution, a sealing embedded ring is fixedly connected to one side of the fixed flange, and an embedded groove is provided on one side of the loose flange, with one end of the sealing embedded ring extending into the interior of the embedded groove.

[0008] As a further preferred embodiment of this technical solution, a sealing gasket is fixedly connected to the inner side of the fixed flange, and a sealing groove is provided on the inner side of the loose flange, with the outer side of the sealing gasket abutting against the inner wall of the sealing groove.

[0009] As a further preferred embodiment of this technical solution, a positioning block is fixedly connected to one side of the loose flange, and a positioning hole is provided inside the metal spiral wound gasket, with the inner wall of the positioning hole slidably connected to the positioning block.

[0010] This utility model provides a pipe connection flange, which has the following advantages:

[0011] (1) This utility model achieves rapid centering through the sliding cooperation of the L-shaped positioning block and the locking groove. Combined with the secondary positioning of the sealing embedded ring and the embedded groove, it can complete the precise pre-alignment before the bolt is tightened, which significantly improves the installation efficiency. At the same time, the positioning block cooperates with the positioning hole of the metal spiral gasket to prevent the gasket from deflecting and ensure that the sealing surface is evenly pressured.

[0012] (2) This utility model forms the first sealing barrier by the interference fit between the sealing gasket and the sealing groove. Combined with the high elasticity compensation characteristics of the metal spiral wound gasket, it can still maintain contact stress when there is vibration or temperature change. The floating design of the loose flange and the fixed flange allows for ±2° deflection compensation. The stress self-adaptive adjustment is achieved by the progressive locking of the threaded block and the fixing bolt, which reduces the installation difficulty and extends the sealing life. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of a half-section of the present invention;

[0015] Figure 3 This is a schematic diagram of the separation structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the fixed flange structure of this utility model;

[0017] Figure 5 This is a schematic diagram of the loose flange structure of this utility model;

[0018] In the diagram: 1. Fixed flange; 2. Loose flange; 3. Spiral wound gasket; 4. L-shaped positioning block; 5. Sealing insert ring; 6. Sealing gasket; 7. Locking groove; 8. Insert groove; 9. Sealing groove; 10. Positioning block; 11. Positioning hole; 12. Through hole; 13. Flange hole; 14. Fixing bolt; 15. Threaded block; 16. Flange neck. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] This utility model provides a technical solution: such as Figures 1-5As shown, in this embodiment, a pipe connection flange includes a fixed flange 1 and a loose flange 2. Flange necks 16 are fixedly connected to the opposite sides of both the fixed flange 1 and the loose flange 2. A spiral wound gasket 3 is provided between the fixed flange 1 and the loose flange 2. Flange holes 13 are provided inside both the fixed flange 1 and the loose flange 2. A through hole 12 is provided inside the spiral wound gasket 3. A fixing bolt 14 is provided between the flange hole 13 and the through hole 12. A threaded block 15 is fixedly connected to one side of the fixed flange 1. One end of the fixing bolt 14 extends into the threaded block 15 and is threadedly connected to its inner wall. A positioning block 10 is fixedly connected to one side of the loose flange 2. A positioning hole 11 is provided inside the spiral wound gasket 3, and the inner wall of the positioning hole 11 is slidably connected to the positioning block 10.

[0021] When connecting pipe flanges, first connect the fixed flange 1 to the external pipe. Then, place the spiral wound gasket 3 on one side of the loose flange 2. Next, align the loose flange 2 with the fixed flange 1 (i.e., align the flange holes 13 of the fixed flange 1 and the loose flange 2 with the through hole 12 of the spiral wound gasket). Finally, use the fixing bolt 14 to pass through the two flange holes 13 and the through hole 12, so that the outer side of the fixing bolt 14 is threadedly connected to the threaded block 15.

[0022] like Figures 1-5 As shown, an L-shaped positioning block 4 is fixedly connected to one side of the fixed flange 1, and a locking groove 7 is provided on one side of the loose flange 2. One end of the L-shaped positioning block 4 extends into the interior of the locking groove 7 and is slidably connected to its inner wall. A sealing embedded ring 5 is fixedly connected to one side of the fixed flange 1, and an embedded groove 8 is provided on one side of the loose flange 2. One end of the sealing embedded ring 5 extends into the interior of the embedded groove 8. A sealing gasket 6 is fixedly connected to the inner side of the fixed flange 1, and a sealing groove 9 is provided on the inner side of the loose flange 2. The outer side of the sealing gasket 6 abuts against the inner wall of the sealing groove 9.

[0023] During the docking process of the fixed flange 1 and the loose flange 2, the L-shaped positioning block 4, the sealing embedded ring 5, and the sealing gasket 6 are first extended into the locking groove 7, the embedded groove 8, and the sealing groove 9, respectively. After the L-shaped positioning block 4 enters the locking groove 7, the loose flange 2 is rotated to make the L-shaped positioning block 4 slide around the locking groove 7, thereby achieving initial positioning. The sealing embedded ring 5 is embedded in the embedded groove 8 to achieve secondary positioning. After adjustment, the flange holes 13 inside the fixed flange 1 and the loose flange 2 are aligned, which facilitates the subsequent tightening work.

[0024] This utility model provides a pipe connection flange, and its specific working principle is as follows: When connecting the pipe flange, firstly, the fixed flange 1 and the loose flange 2 are welded and fixed to the pipe respectively. Then, the metal spiral wound gasket 3 is attached to the loose flange 2 (positioning is achieved by using the positioning block 10 and the positioning hole 11). The pre-positioning is achieved by the cooperation of the L-shaped positioning block 4 and the locking groove 7. The loose flange 2 is rotated so that the sealing embedded ring 5 accurately enters the embedded groove 8. Finally, after ensuring that all connection holes are coaxially aligned, the fixing bolts 14 are used to connect and tighten them in sequence.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe connection flange, comprising a fixed flange (1) and a loose flange (2), characterized in that: The fixed flange (1) and the loose flange (2) are both fixedly connected to flange necks (16) on opposite sides. A metal spiral wound gasket (3) is provided between the fixed flange (1) and the loose flange (2). Flange holes (13) are provided inside the fixed flange (1) and the loose flange (2). A through hole (12) is provided inside the metal spiral wound gasket (3). A fixing bolt (14) is provided between the flange hole (13) and the through hole (12). A threaded block (15) is fixedly connected to one side of the fixed flange (1). One end of the fixing bolt (14) extends into the inside of the threaded block (15) and is threaded to its inner wall.

2. A pipe connection flange according to claim 1, characterized in that: An L-shaped positioning block (4) is fixedly connected to one side of the fixed flange (1), and a locking groove (7) is provided on one side of the loose flange (2). One end of the L-shaped positioning block (4) extends into the interior of the locking groove (7) and is slidably connected to its inner wall.

3. A pipe connection flange according to claim 1, characterized in that: A sealing insert ring (5) is fixedly connected to one side of the fixed flange (1), and an insert groove (8) is provided on one side of the loose flange (2), with one end of the sealing insert ring (5) extending into the interior of the insert groove (8).

4. A pipe connection flange according to claim 1, characterized in that: A sealing gasket (6) is fixedly connected to the inner side of the fixed flange (1), and a sealing groove (9) is provided on the inner side of the loose flange (2). The outer side of the sealing gasket (6) abuts against the inner wall of the sealing groove (9).

5. A pipe connection flange according to claim 1, characterized in that: A positioning block (10) is fixedly connected to one side of the loose flange (2), and a positioning hole (11) is provided inside the metal spiral wound gasket (3). The inner wall of the positioning hole (11) is slidably connected to the positioning block (10).

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