Sealed and fixed threaded clamp flange structure

Abstract

The utility model relates to the technical field of pipe fitting sealing connection, and discloses a sealed and fixed threaded type clamp flange structure which is used for sealing and connecting pipelines and comprises a clamp pipeline assembly, a threaded type clamp fixing ring and a sealing backing ring. The clamp pipeline assembly is provided with an inner taper annular face, the threaded clamp fixing ring is provided with a V-shaped taper annular face and a thread, and the end of the clamp pipeline assembly is provided with a thread matched with the thread. The sealing backing ring is provided with a taper annular face matched with the inner taper annular face. And the hoop pipeline assembly is in threaded connection with the threaded type hoop fixing ring through threads. According to the sealed and fixed threaded type clamp flange structure, the inner face and the outer face of the flange connector are designed to be the taper annular faces, the extrusion area of the clamp assembly and the flange connector is increased, stress concentration is reduced, and it can be guaranteed that the flange connector and the sealing ring are effectively meshed together; the sealing performance of the pipeline is ensured.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting sealing connection technology, specifically a threaded clamp flange structure for sealing and fixing. Background Technology

[0002] Pipeline transportation is widely used in the transport of fluid media such as water, fuel oil, and natural gas, including water supply pipelines, natural gas pipelines, and working fluid pipelines in compressors. Pipeline transportation offers advantages such as low cost, good continuity, and high safety. However, due to limitations in transportation routes and distances, pipeline transportation is rarely accomplished with a single pipe fitting. Furthermore, the transportation process requires corresponding fittings to regulate the transport task; therefore, pipeline transportation systems often consist of multiple or various pipe fittings connected together. The connection method between fittings must ensure the pipeline's sealing and safety while also saving costs and facilitating installation. Currently, common flange connection methods used in oil, natural gas, high-temperature, and high-pressure water pipelines include bolting and welding. Bolted connections require high precision in the flange and corresponding threaded hole positions to ensure even stress distribution and sealing. While welding has lower requirements for flange structure machining precision compared to threaded connections, welding is generally not repeatable, resulting in poor utilization. Additionally, flanges are usually sealed with a gasket between two flanges, which is prone to leakage, especially in high-pressure pipeline applications.

[0003] To address this issue, we propose a threaded clamp flange structure for sealing and fixing. Utility Model Content

[0004] The purpose of this utility model is to provide a threaded clamp flange structure for sealing and fixing, which solves the problems in the background art mentioned above.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing and fixing threaded clamp flange structure for sealing and connecting pipelines, comprising a clamp pipeline assembly, a threaded clamp fixing ring, and a sealing gasket ring; the clamp pipeline assembly has an inner tapered annular surface, the threaded clamp fixing ring has a V-shaped tapered annular surface and a thread one, and the end of the clamp pipeline assembly is provided with a thread two adapted to the thread one; the sealing gasket ring has a tapered annular surface adapted to the inner tapered annular surface; the clamp pipeline assembly is connected to the thread one of the threaded clamp fixing ring through the thread two, and the tapered annular surface of the sealing gasket ring is in sealing fit with the inner tapered annular surface of the clamp pipeline assembly; it also includes two clamps, each clamp having a tapered annular surface adapted to the V-shaped tapered annular surface of the threaded clamp fixing ring, and the two clamps are fixedly connected by a double-ended bolt and a nut to clamp the threaded clamp fixing ring.

[0006] Preferably, the inner tapered annular surface of the clamp pipeline assembly, the V-shaped tapered annular surface of the threaded clamp fixing ring, and the tapered annular surface of the sealing gasket ring are all provided with an arc-shaped 23° angle.

[0007] Preferably, the tapered annular surface edge of the sealing gasket ring has a rounded corner of R1.5.

[0008] Preferably, the sealing ring is made of 316 stainless steel.

[0009] Preferably, there are two clamps, and the two clamps are symmetrically clamped to the threaded clamp fixing ring by double-ended bolts and nuts.

[0010] Preferably, the two threaded clamp fixing rings are respectively fixedly connected to the end of the pipe to be connected by threads to form a sealing structure.

[0011] Preferably, the tapered annular surface of the clamp and the V-shaped tapered annular surface of the threaded clamp fixing ring form a compression sealing fit to increase the contact area and reduce stress concentration.

[0012] This utility model provides a threaded clamp flange structure for sealing and fixing. This threaded clamp flange structure has the following advantages:

[0013] This sealed and fixed threaded clamp flange structure designs both the inner and outer surfaces of the flange joint as tapered annular surfaces, increasing the compression area between the clamp assembly and the flange joint, reducing stress concentration, and ensuring that the flange joint and the sealing ring are effectively engaged together. Through the compression between the clamp assembly and the flange joint, the sealing performance of the pipeline is guaranteed. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of an embodiment of the threaded clamp flange structure for sealing and fixing according to the present invention.

[0015] Figure 2 This is a schematic diagram of the axial structure of the threaded clamp flange in the sealing and fixing threaded clamp flange structure of this utility model.

[0016] In the diagram: 1. Clamping pipe assembly; 2. Threaded clamp fixing ring; 3. Thread 1; 4. Thread 2; 5. Clamp; 6. Tapered annular surface; 7. V-shaped tapered annular surface; 8. Sealing gasket ring; 9. Inner tapered annular surface; 10. Bolt; 11. Nut. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, this utility model provides a technical solution: a threaded clamp flange structure for sealing and fixing pipes, including a clamp pipe assembly 1, a threaded clamp fixing ring 2, and a sealing gasket ring 8; the clamp pipe assembly 1 has an inner tapered annular surface 9, the threaded clamp fixing ring 2 has a V-shaped tapered annular surface 7 and a thread 3; the inner tapered annular surface 9 of the clamp pipe assembly 1, the V-shaped tapered annular surface 7 of the threaded clamp fixing ring 2, and the tapered annular surface 6 of the sealing gasket ring 8 are all provided with an arc-shaped 23° angle; the end of the clamp pipe assembly 1 is provided with a thread 4 adapted to the thread 3; the sealing gasket ring 8 has a tapered annular surface 6 adapted to the inner tapered annular surface 9; the edge of the tapered annular surface 6 of the sealing gasket ring 8 has a radius of R1.5; the sealing gasket ring 8 is made of 316 stainless steel; the clamp pipe... Assembly 1 is connected to thread 3 of threaded clamp fixing ring 2 via thread 2 4. The tapered annular surface 6 of sealing gasket ring 8 is sealed to the inner tapered annular surface 9 of clamp pipeline assembly 1. It also includes two clamps 5, each clamp having a tapered annular surface adapted to the V-shaped tapered annular surface 7 of threaded clamp fixing ring 2. The two clamps 5 are fixedly connected by double-ended bolts 10 and nuts 11 to clamp the threaded clamp fixing ring 2. There are two clamps 5, and the two clamps 5 symmetrically clamp the threaded clamp fixing ring 2 via double-ended bolts 10 and nuts 11. The two threaded clamp fixing rings 2 are respectively fixedly connected to the end of the pipe to be connected by threads to form a sealing structure. The tapered annular surface of clamp 5 and the V-shaped tapered annular surface 7 of threaded clamp fixing ring 2 form a compression sealing fit to increase the contact area and reduce stress concentration.

[0019] When using this sealed and fixed threaded clamp flange structure:

[0020] I. Core Design Principles of Sealing Structures

[0021] Conical surface meshing sealing mechanism

[0022] The inner tapered annular surface of the flange joint fits tightly with the tapered surface of the sealing ring, while the outer tapered annular surface forms a compression fit with the V-shaped clamping surface of the clamping pipe assembly. This tapered surface structure converts axial pressure into radial sealing force, causing the sealing ring to undergo elastic deformation, filling the microscopic gaps on the contact surface, and achieving initial sealing.

[0023] The conical design increases the contact area (compared to a flat seal), reduces stress concentration, and maintains uniform sealing pressure even under high-pressure conditions.

[0024] Cooperative fixing of threads and clamps

[0025] The two flange joints are directly connected to the pipeline via threads to ensure stable axial positioning; the clamp pipeline assembly consists of two clamps that are tightened by double-ended bolts and nuts, which transmit the axial force to the outer conical surface of the flange joint, further compressing the sealing ring and enhancing the sealing effect.

[0026] II. Sealing Compensation Process under Dynamic Pressure

[0027] Fluid pressure enhanced seal

[0028] When the fluid in the pipeline generates pressure, the medium pressure acts on the inner side of the sealing ring, pushing the sealing ring against the inner conical surface of the flange joint. At the same time, the V-shaped clamping surface of the clamp maintains pressure on the outer conical surface of the flange joint due to axial force. This "bidirectional compression" effect causes the sealing surface pressure to increase as the medium pressure rises, forming a self-tightening seal, which is especially suitable for high-pressure scenarios.

[0029] Stress Dispersion and Wear Compensation

[0030] The fit between the conical surface and the V-shaped clamping surface disperses concentrated stress into uniform surface contact stress, preventing seal failure caused by localized overload. Even after prolonged use and slight wear, the elastic clamping force of the clamp (through bolt pre-tightening) can compensate for gaps and maintain sealing performance.

[0031] III. Technical Advantages of Structural Details

[0032] 23° rounded chamfer design

[0033] All conical edges are chamfered with a 23° rounded corner (R1.5 rounded corner on the sealing ring edge) to eliminate machining burrs and stress concentration points, avoid scratching the pipe or sealing surface during assembly, and optimize the resistance of fluid flow to reduce erosion wear.

[0034] Repeatable disassembly and reassembly of threaded connections

[0035] Flange joints are connected to pipes via threads, which are easier to disassemble and maintain than welding. The thread fit accuracy requirements are lower than those of traditional bolt flanges, reducing processing costs and avoiding the impact of welding deformation on sealing performance.

[0036] IV. Operating Condition Adaptability and Safety Mechanisms

[0037] High-pressure scenarios: The high strength and corrosion resistance of the 316 stainless steel sealing ring, combined with the conical self-tightening seal, can withstand the long-term impact of high-pressure media such as oil and natural gas, and the sealing pressure increases synchronously with the medium pressure.

[0038] Temperature fluctuations: The thermal stability of stainless steel ensures that the sealing structure will not increase in gap due to thermal expansion and contraction in high-temperature (such as steam pipelines) or low-temperature environments, thus maintaining the reliability of the seal.

[0039] Ease of installation: The combination of clamps and bolts does not require precise alignment of threaded holes (compared to traditional flanges). During installation, sealing can be achieved simply by tightening the bolts evenly, reducing the difficulty of on-site construction.

[0040] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model. Furthermore, it should be noted that the components of this utility model are not limited to the overall application described above. Each technical feature described in the specification of this utility model can be used individually or in combination as needed. Therefore, this utility model naturally covers other combinations and specific applications related to the points of this utility model.

Claims

1. A threaded clamp flange structure for sealing and fixing pipes, characterized in that: The assembly includes a clamp-type pipeline assembly (1), a threaded clamp retaining ring (2), and a sealing gasket ring (8); the clamp-type pipeline assembly (1) has an inner tapered annular surface (9), the threaded clamp retaining ring (2) has a V-shaped tapered annular surface (7) and a first thread (3), and the end of the clamp-type pipeline assembly (1) is provided with a second thread (4) that is adapted to the first thread (3); the sealing gasket ring (8) has a tapered annular surface (6) that is adapted to the inner tapered annular surface (9); the clamp-type pipeline assembly (1) is connected by a screw... The second thread (4) is connected to the thread one (3) of the threaded clamp fixing ring (2), and the tapered annular surface (6) of the sealing gasket ring (8) is sealed to the inner tapered annular surface (9) of the clamp pipeline assembly (1); it also includes two clamps (5), which have tapered annular surfaces that are adapted to the V-shaped tapered annular surface (7) of the threaded clamp fixing ring (2). The two clamps (5) are fixedly connected by double-headed bolts (10) and nuts (11) to clamp the threaded clamp fixing ring (2).

2. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The inner tapered annular surface (9) of the clamp pipeline assembly (1), the V-shaped tapered annular surface (7) of the threaded clamp fixing ring (2), and the tapered annular surface (6) of the sealing gasket ring (8) are all provided with an arc-shaped 23° angle.

3. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The tapered annular surface (6) edge of the sealing gasket (8) has a radius of R1.

5.

4. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The sealing ring (8) is made of 316 stainless steel.

5. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The number of clamps (5) is 2, and the two clamps (5) are symmetrically clamped to the threaded clamp fixing ring (2) by double-headed bolts (10) and nuts (11).

6. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The two threaded clamp fixing rings (2) are respectively fixedly connected to the end of the pipe to be connected by threads to form a sealing structure.

7. The threaded clamp flange structure for sealing and fixing according to claim 1, characterized in that: The tapered annular surface of the clamp (5) and the V-shaped tapered annular surface (7) of the threaded clamp fixing ring (2) form a compression sealing fit to increase the contact area and reduce stress concentration.

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