Leakage-proof connecting structure of process pipeline

Abstract

The utility model relates to the technical field of pipeline leakage prevention, in particular to a leakage-proof connecting structure of a process pipeline. The wedge-shaped gaskets are jointly arranged in the conical grooves, the belleville springs matched with the bolts in size are installed between the bolts and the installation holes, the pre-compressed belleville springs are arranged between the bolts and the installation holes, and elastic force can be released in real time under the vibration working condition through the elastic energy storage characteristic of the pre-compressed belleville springs; belleville springs can dynamically compensate bolt pre-tightening force loss caused by vibration, the sealing crushing risk caused by a traditional rigid pre-tightening mode is reduced, when the wedge-shaped gaskets embedded in the conical grooves are subjected to axial pressure, part of axial force is converted into radial expansion force through wedge-shaped arrangement of the wedge-shaped gaskets and geometric matching of the conical grooves, and therefore the sealing effect is improved. The radial pressure directly acts on the sealing face formed by the first flange plate and the second flange plate, even if the bolt pre-tightening force is lost due to long-term vibration, the tight contact of the sealing face can still be maintained through the radial pressure, and the leakage prevention of the structure is jointly guaranteed through the synergistic effect of the belleville spring and the wedge-shaped gasket.

Description

Technical Field

[0001] This utility model relates to the field of pipeline leakage prevention technology, specifically to a leakage prevention connection structure for process pipelines. Background Technology

[0002] Leak-proof connections for process piping typically use flange connections as the most basic sealing method. The core of this system consists of a pair of flanges with sealing surfaces and evenly distributed bolts and nuts. During installation, the flanges are fixed to the pipe ends by welding or threading. Axial pressure is generated by symmetrically tightening the bolts, thus achieving a media seal. This structure is simple, reliable, and easy to disassemble and maintain, making it widely applicable to medium and low-pressure conditions and a common solution for leak prevention in industrial piping systems. Some process pipelines require the flow of high-pressure media. High-pressure media can cause frequent vibrations in the pipeline, which may lead to gaps in the connection structure.

[0003] Existing technologies typically use preload applied to rigid components on both sides to compensate for gaps. However, long-term application of preload can lead to bolt fatigue and easily cause crushing of the sealing surface, resulting in structural leakage. Therefore, we propose a leak-proof connection structure for process pipelines. Utility Model Content

[0004] This utility model provides a leak-proof connection structure for process pipelines. It uses a wedge-shaped gasket to convert part of the axial force into radial expansion force to maintain tight contact of the sealing surface. It also works in conjunction with a disc spring to compensate for the preload reduction caused by bolt fatigue, thus achieving leak prevention.

[0005] To achieve the above objectives, the system includes a first protective sleeve and a second protective sleeve that are symmetrically arranged. The outer walls of the first and second protective sleeves are respectively fixedly connected to a first flange and a second flange, and the first and second flanges are flange-connected. Both the first and second flanges have arrayed mounting holes, which correspond one-to-one and are used to install bolts. The sealing surfaces of the first and second flanges have two pairs of symmetrical conical grooves, and each pair of conical grooves has a wedge-shaped gasket that contacts the inner wall of the conical groove. A disc spring adapted to the bolt size is installed between the bolt and the mounting hole.

[0006] In the above technical solution, the wedge gasket is set in a symmetrical conical groove. The wedge gasket contacts the inner wall of the conical groove and uses the wedge cross section to convert the axial preload into radial expansion force, which acts directly on the sealing surface between the first tooth block and the first flange. This reduces the dependence on the axial load of the bolt and avoids the sealing surface from being crushed due to overload of a single axial pressure. The disc spring is pre-compressed and installed between the bolt and the mounting hole. It absorbs vibration energy through its elastic energy storage characteristics, compensates for the preload attenuation caused by bolt fatigue in real time, and suppresses the formation of sealing gaps.

[0007] Based on this, the wedge-shaped gasket is axially clamped at the position where the conical groove meets. Utilizing the geometric constraint of the conical groove, the wedge-shaped gasket is fixed at the axially stressed position, forcing the axial preload to be converted into radial expansion force, while avoiding sealing failure caused by wedge-shaped gasket displacement. The inner wall of the conical groove is provided with a graphite layer, which is closely attached to the inner wall of the wedge-shaped gasket. Through the low friction characteristics and high temperature resistance of the graphite layer, the sliding resistance between the wedge-shaped gasket and the conical groove is reduced, and the micro gaps are filled to ensure adaptive fitting of the sealing interface under dynamic working conditions.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] By setting a pre-compressed disc spring between the bolt and the mounting hole, its elastic energy storage characteristics can release the elastic force in real time under vibration conditions. The disc spring can dynamically compensate for the loss of bolt preload caused by vibration, reducing the risk of seal crushing caused by traditional rigid preload methods. When the wedge-shaped gasket embedded in the conical groove is subjected to axial pressure, its wedge shape and geometric fit with the conical groove will convert part of the axial force into radial expansion force, which will directly act on the sealing surface formed by the first flange and the second flange. Even if the bolt preload is lost due to long-term vibration, the tight contact of the sealing surface can still be maintained by radial pressure. The synergistic effect of the disc spring and the wedge gasket together ensures the leakage prevention of the structure. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is an exploded view of a partial structure of the present invention;

[0012] Figure 3 This is a side view schematic diagram of the structure of the second protective sleeve of this utility model.

[0013] The meanings of the labels in the diagram are as follows:

[0014] 1. First protective sleeve; 11. First toothed block; 12. First flange; 2. Second protective sleeve; 21. Second toothed block; 22. Second flange; 3. Bolt; 31. Butterfly spring; 4. Sealing ring; 5. Wedge gasket; 6. Tapered groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Currently, the problem of bolt fatigue and sealing surface crushing due to prolonged preload, leading to structural leakage, is addressed by this invention, which provides a leak-proof connection structure for process pipelines. (See attached diagram.) Figures 1-3 As shown, it includes a first protective sleeve 1 and a second protective sleeve 2 that are symmetrical to each other. Specifically, the inner walls of the first protective sleeve 1 and the second protective sleeve 2 are provided with anti-slip textures. Users can insert the connected process pipes into the first protective sleeve 1 and the second protective sleeve 2. The anti-slip textures can reduce the slippage of the pipes and thus ensure that the structure is leak-proof. The first protective sleeve 1 and the second protective sleeve 2 protect the pipes.

[0017] Additionally, see Figure 2 As shown, a sealing ring 4 is embedded on the inner side of the connection between the first protective sleeve 1 and the second protective sleeve 2. The sealing ring 4 is used to achieve internal sealing of the structure and improve the sealing performance of the structure.

[0018] See Figure 2 As shown, the outer walls of the first protective sleeve 1 and the second protective sleeve 2 are respectively fixedly connected to the first flange 12 and the second flange 22, and the first flange 12 and the second flange 22 are flange-connected. The first flange 12 and the second flange 22 are both provided with arrayed mounting holes, which correspond one-to-one and are all fitted with bolts 3. Specifically, the outer wall of the first flange 12 is fixedly connected to multiple first toothed blocks 11, and the outer wall of the second flange 22 is fixedly connected to multiple second toothed blocks 21, which mesh with the first toothed blocks 11. When the user closes the first flange 12 and the second flange 22, the second toothed blocks 21 can be aligned with the first toothed blocks 11, and the bolts 3 can be installed in the mounting holes to prevent the first protective sleeve 1 and the second protective sleeve 2 from rotating relative to each other under vibration or torque. This ensures that the sealing surfaces formed by the first toothed blocks 11 and the first flange 12 are aligned and the bolts 3 are evenly distributed to generate pre-tightening force, thereby enhancing the connection stability.

[0019] Working principle: During installation, bolt 3 passes through the mounting holes of the first flange 12 and the second flange 22 and is tightened. The butterfly spring 31 is compressed and stores elastic potential energy. At this time, the spring provides initial preload, so that the first toothed block 11 and the first flange 12 form a seal and press the wedge gasket 5. The wedge gasket 5 is placed in the symmetrical conical groove 6 and is squeezed by the axial preload. Its wedge-shaped section contacts the inner wall of the conical groove 6, converting part of the axial force into radial expansion force, forcing the wedge gasket 5 to expand and form an initial seal. When pipeline vibration or pressure fluctuation causes the preload of bolt 3 to drop instantaneously, the butterfly spring 31 releases the stored elastic potential energy and compensates for the preload loss in real time through elastic rebound, suppressing the tendency of the first toothed block 11 to separate from the first flange 12. Vibration causes the first toothed block 11 and the first flange 12 to have a slight displacement, causing the wedge gasket 5 to slide slightly in the conical groove 6. Since the inner wall of the conical groove 6 is provided with a graphite layer, the wedge gasket 5 can continuously convert the residual axial pressure into radial expansion force, maintaining the stability of the sealing surface contact pressure.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leak-proof connection structure for a process pipeline, comprising a first protective sleeve (1) and a second protective sleeve (2) symmetrically arranged, wherein a first flange (12) and a second flange (22) are respectively fixedly connected to the outer walls of the first protective sleeve (1) and the second protective sleeve (2), and the first flange (12) and the second flange (22) are flange-connected, wherein an array of mounting holes are provided on both the first flange (12) and the second flange (22), and bolts (3) are installed in a common manner on each of the mounting holes, wherein two pairs of symmetrical conical grooves (6) are provided on the sealing surfaces of the first flange (12) and the second flange (22), characterized in that: A wedge-shaped gasket (5) is arranged in each of the conical grooves (6) and is in contact with the inner wall of the conical groove (6), and a butterfly spring (31) with a size matching that of the bolt (3) is arranged between the bolt (3) and the mounting hole.

2. The leak-tight connection structure of process piping according to claim 1, characterized by: The inner walls of the first protective sleeve (1) and the second protective sleeve (2) are provided with anti-skid lines.

3. The leak-tight connection structure of process piping according to claim 1, characterized by: The inner sides of the connection parts of the first protective sleeve (1) and the second protective sleeve (2) are embedded with sealing rings (4).

4. The leak-tight connection structure of process piping according to claim 1, characterized by: The outer wall of the first flange plate (12) is fixedly connected with a plurality of first tooth blocks (11), the outer wall of the second flange plate (22) is fixedly connected with a plurality of second tooth blocks (21), and the second tooth blocks (21) and the first tooth blocks (11) are mutually engaged.

5. The leak-tight connection structure of process piping according to claim 1, characterized by: The wedge-shaped gasket (5) is axially clamped at the position where the conical grooves (6) meet.

6. The leak-tight connection structure of process piping according to claim 1, characterized by: The inner wall of the conical groove (6) is provided with a graphite layer, and the graphite layer is in close contact with the inner wall of the wedge-shaped gasket (5).

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