High-pressure metal sealing ring gasket

Abstract

The utility model discloses a high-pressure metal sealing ring gasket which comprises a ring gasket body, a round-bottom elastic telescopic groove is formed in the side face of the ring gasket body, a first taper sealing face and a second taper sealing face are arranged on the upper side and the lower side of the side face of the ring gasket body respectively, and a 14-degree included angle is formed between the first taper sealing face and the vertical line. And an included angle of 16 degrees is formed between the second taper sealing surface and the vertical line. The utility model has the advantages of elasticity and reusability.

Description

Technical Field

[0001] The utility model relates to the field of ring gaskets, in particular to a high-pressure metal sealing ring gasket. Background Art

[0002] Disadvantages of current traditional metal sealing ring gaskets:

[0003] 1. Traditional metal seals that are sealed by plastic deformation cannot be reused, resulting in huge material waste;

[0004] 2. The flange groove needs to withstand high loads. To avoid damage to the flange groove, the hardness of the sealing ring is required to be high, which increases the manufacturing difficulty;

[0005] 3. Low surface roughness and low sealing performance;

[0006] 4. The ring groove sealing structure designed for non-elastic sealing has poor self-sealing function or even fails. Utility Model Content

[0007] The purpose of the utility model is to provide a high-pressure metal sealing ring gasket to solve the problems raised in the above background technology, which has the advantages of elasticity and reusability.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-pressure metal sealing ring gasket, comprising a ring gasket body, a side surface of the ring gasket body being provided with a round-bottomed elastic expansion groove, and a first tapered sealing surface and a second tapered sealing surface being provided on the upper and lower sides of the side surface of the ring gasket body, the first tapered sealing surface forming an angle of 14° with the vertical line, and the second tapered sealing surface forming an angle of 16° with the vertical line.

[0009] Preferably, an inclined surface is provided on the inner side of the ring gasket body, and the inclined surface forms an angle of 30° with the horizontal line.

[0010] Preferably, a flange is provided on the outer side of the ring gasket body, a sealing groove is provided in the flange, a screw is passed through the flange, and nuts are threadedly connected at both ends of the screw.

[0011] Preferably, the ring gasket body is provided with a coating, and the coating is made of one of molybdenum disulfide, polytetrafluoroethylene, and silver.

[0012] Preferably, the sealing surface roughness of the ring gasket is set to Ra≤0.8µm.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The elastic sealing design principle is that the outer diameter round bottom groove not only provides elastic expansion space for the sealing part, but also provides more effective resilience for the sealing part compared with ordinary grooves;

[0015] 2. Double-tapered sealing surface design improves the accuracy of face sealing;

[0016] 3. Low bolt preload is used to make the seal elastically deform without damaging the flange groove surface. Therefore, no hardness requirement is required for the sealing ring, which subverts the technical requirements on hardness of traditional metal sealing rings and eliminates the difficulty of manufacturing that requires special processes.

[0017] 4. Define the selection principle of sealing ring materials. Metal materials with high rebound ability should be used.

[0018] 5. Types of surface coatings, technical requirements and installation methods related to different coatings;

[0019] 6. It has high-pressure self-sealing function, which greatly improves the sealing reliability;

[0020] 7. The ability to be reused can save raw materials and reduce manufacturing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the ring gasket body;

[0022] Figure 2 for Figure 1 A partial enlarged view of area A in the middle;

[0023] Figure 3 Schematic diagram of the structure of the ring gasket body;

[0024] Figure 4 This is a schematic diagram of the structure of the embodiment before assembly;

[0025] Figure 5 This is a schematic diagram of the structure after assembly of the embodiment;

[0026] Figure 6 is a schematic diagram of the design load direction of the embodiment;

[0027] Figure 7 A cross-sectional view of an embodiment.

[0028] In the figure: 1. Ring gasket body; 2. Round bottom elastic expansion groove; 3. First taper sealing surface; 4. Second taper sealing surface; 5. Inclined surface; 6. Flange; 7. Sealing groove; 8. Screw; 9. Nut. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the embodiment of the present utility model,

[0031] A high pressure metal sealing ring gasket, such as Figure 1-Figure 7 As shown, it includes a ring gasket body 1, and a round-bottom elastic expansion groove 2 is provided on the side of the ring gasket body 1. The upper and lower sides of the side of the ring gasket body 1 are both provided with a first tapered sealing surface 3 and a second tapered sealing surface 4. The first tapered sealing surface 3 forms an angle of 14° with the vertical line, and the second tapered sealing surface 4 forms an angle of 16° with the vertical line.

[0032] An inclined surface 5 is provided on the inner side of the ring gasket body 1 , and the inclined surface 5 forms an angle of 30° with the horizontal line.

[0033] A flange 6 is provided on the outer side of the ring gasket body 1 , a sealing groove 7 is provided in the flange 6 , a screw 8 is passed through the flange 6 , and nuts 9 are threadedly connected at both ends of the screw 8 .

[0034] The ring gasket body 1 is provided with a coating, and the coating is selected from one of molybdenum disulfide, polytetrafluoroethylene, and silver.

[0035] The sealing surface roughness of the ring gasket is set to Ra≤0.8µm.

[0036] It is worth noting that the conventional hardness differential between the RTJ gasket and the sealing groove 7, which should be manufactured using a forged ring, does not apply to the gasket body 1 in this paper. This gasket body 1 does not require special hardness requirements because the forces it must withstand are far less than those of RTJ gaskets, which require load management. In conventional flange 6 sealing connections, all bolt force is used to activate the gasket's sealing function through plastic deformation. In the sealing groove 7 described in this paper, however, only approximately 10% of the bolt preload is used to elastically deform the sealing ring. Due to the lower force transmitted, localized deformation or denting of the sealing groove 7 is unlikely. In practice, the hardness of the sealing ring material is typically higher than that of the flange 6 groove surface.

[0037] The gasket body is suitable for high-neck welding flanges, blind flanges, valve / equipment integral flanges, orifice plate gaskets, and threaded flanges used in pipelines in the petroleum, petrochemical, and natural gas industries. It is suitable for high-pressure metal sealing gaskets with pressure ratings up to Class 2500 and operating temperatures ranging from -196°C to +250°C.

[0038] Working principle:

[0039] The inclined surface 5 of the sealing groove 7 is subjected to the tightening force of the bolt and is squeezed to the first tapered sealing surface 3 and the second tapered sealing surface 4 of the ring gasket body 1 to produce an elastic seal.

[0040] 1. Unlike traditional metal ring gaskets that produce seals through plastic deformation, the ring gasket in this solution produces seals through elastic deformation. The elastic deformation space is mainly achieved through the round-bottom elastic expansion groove 2 on the outer diameter. A large number of practical applications have proved that under the same torque tightening force, the elastic expansion groove 2 on the outer diameter produces a better rebound force at the sealing part than the ordinary concave groove.

[0041] 2. For the sealing ring, the mating connection part is improved from the traditional RTJ flange 6 groove to a dedicated flange 6 groove for this sealing ring. The axial force of the flange 6 groove sealing surface after bolt tightening acts on the inclined surface 5 of the metal sealing ring and is converted into radial sealing force. In addition, as the preload increases, the inclined surface 5 closes, achieving surface-to-surface contact;

[0042] 3. Design of the first tapered sealing surface 3 and the second tapered sealing surface 4. Due to the allowable machining deviation between the sealing groove 7 and the gasket body 1, after the upper and lower flanges 6 are closed, the conventional single-angle sealing surface design is likely to produce a line seal with the flange 6 groove, rather than an ideal surface seal. Therefore, the design of the first tapered sealing surface 3 and the second tapered sealing surface 4 is to compensate for the fitting clearance caused by the machining limit deviation between the sealing groove 7 and the gasket body 1, ensuring that a surface seal can be achieved;

[0043] 4. High-pressure self-sealing function: As the pressure of the medium in the pipeline increases, the flange 6 begins to produce spacing, and the sealing part with elastic deformation characteristics begins to rebound to produce self-sealing. At the same time, the inner wall of the sealing ring is pressurized by the medium, and the internal pressure is transmitted to the outer diameter inclined surface 5 to produce self-sealing function. The greater the pressure, the better the self-sealing effect.

[0044] 5. The elastic sealing design enables the sealing ring to rebound to its original state after use and disassembly, so the intact sealing ring can be reused.

[0045] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-pressure metal sealing ring gasket, characterized by: The invention comprises a ring gasket body (1), wherein a round-bottom elastic expansion groove (2) is provided on the side surface of the ring gasket body (1), and a first tapered sealing surface (3) and a second tapered sealing surface (4) are provided on the upper and lower sides of the side surface of the ring gasket body (1), wherein the first tapered sealing surface (3) forms an angle of 14° with the vertical line, and the second tapered sealing surface (4) forms an angle of 16° with the vertical line.

2. The high-pressure metal sealing ring gasket according to claim 1, characterized in that: An inclined surface (5) is provided on the inner side of the ring gasket body (1), and the inclined surface (5) forms an angle of 30° with the horizontal line.

3. The high-pressure metal sealing ring gasket according to claim 1, characterized in that: A flange (6) is provided on the outer side of the ring gasket body (1), a sealing groove (7) is provided in the flange (6), a screw (8) is passed through the flange (6), and nuts (9) are threadedly connected at both ends of the screw (8).

4. The high-pressure metal sealing ring gasket according to claim 3, characterized in that: The ring gasket body (1) is provided with a coating, wherein the coating is selected from one of molybdenum disulfide, polytetrafluoroethylene, and silver.

5. The high-pressure metal sealing ring gasket according to claim 1, characterized in that: The sealing surface roughness of the ring gasket is set to Ra≤0.8µm.

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