Metallic seal ring gasket

Abstract

The application discloses a metal seal ring gasket, which comprises a ring body made of metal, the cross section shape of the upper and lower end faces of the ring body is trapezoidal or oval, V-shaped grooves are arranged on the upper and lower end faces of the ring body, V-shaped elastic sealing rings are arranged in the V-shaped grooves, extrusion sealing grooves are arranged in the centers of the V-shaped elastic sealing rings, and communication grooves are arranged between the extrusion sealing grooves and the inner sides of the outer end faces of the V-shaped elastic sealing rings. When the ring body is placed between pipeline connecting surfaces and is compressed for use, not only the upper and lower end faces of the ring body and the V-shaped mounting grooves are tightly sealed and matched, but also the V-shaped grooves are deformed inwardly, the V-shaped elastic sealing rings are extruded outwardly, the outer end faces of the V-shaped elastic sealing rings are also elastically contacted and sealed, the sealing performance is improved, the overall sealing is ensured to be good, and the anti-leakage capacity of the metal ring gasket hard sealing is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of hard sealing ring technology, and more particularly to metal sealing ring gaskets. Background Technology

[0002] Metal ring gaskets used for hard seals are placed between the equipment connection surfaces and pressed tightly to ensure a tight seal between the end face of the gasket and the equipment connection surface. In practice, due to machining and assembly errors or uneven distribution of clamping force, the contact between the gasket and the equipment connection surface may be insufficient, resulting in uneven tightness, poor sealing performance, potential leakage, and reduced sealing reliability. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the prior art by providing a metal sealing ring gasket.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a metal sealing ring gasket, comprising a metal ring body, the cross-sectional shape of the upper and lower end faces of the ring body being trapezoidal or elliptical, a V-shaped groove provided on both the upper and lower end faces of the ring body, a V-shaped elastic sealing ring provided in the V-shaped groove, an annular arch groove provided on the outer side wall of the ring body, an elastic hoop, an adhesive sealing ring and an elastic rubber gasket sequentially provided on the annular arch groove from the inside to the outside, the adhesive sealing ring being used to bond the annular arch groove, the elastic hoop and the elastic rubber gasket.

[0005] To further improve the design, a hard rubber sealing ring is installed on the outer bottom corner of the outer end face of the V-shaped elastic sealing ring.

[0006] To further refine the design, the material formulation of the rigid rubber sealing ring, by weight, includes the following substances: 10 parts natural rubber, 50 parts chloroprene rubber, 5 parts plasticizer, 10 parts palygorskite granules, 8 parts bakelite powder, 6 parts antioxidant, 5 parts N660 carbon black, 8 parts vulcanizing agent, 8 parts antimony oxide, 10 parts stearic acid, and 4 parts antioxidant. The above-mentioned materials are added to a mixer and mixed and kneaded at a temperature controlled at 125-130℃ for 3-4 hours to obtain the rubber.

[0007] Further improvements include a compression sealing groove at the center of the V-shaped elastic sealing ring, and a connecting groove between the compression sealing groove and the inner side of the outer end face of the V-shaped elastic sealing ring. A C-shaped support ring made of water-absorbing and expanding rubber is installed inside the compression sealing groove.

[0008] Further improvements include the fixed installation of an elastic inner sealing ring gasket on the inner hole of the ring body. The outer and inner sides of the inner sealing ring gasket are respectively provided with two embedded rings and two hook grooves. The embedded rings correspond to the positions of the expansion grooves. Several reinforcing ribs are provided at intervals on the expansion grooves. The inner sidewall of the ring body is provided with two embedded grooves, which are in concave-convex fit with the two embedded rings.

[0009] The beneficial effects of this invention are as follows: 1. The overall structure of the ring gasket of this invention is novel. When the ring body is placed between the pipe connection surfaces and pressed together, not only do the upper and lower end faces of the ring body and the V-shaped mounting groove make tight contact and seal, but the V-shaped groove deforms inward and squeezes the V-shaped elastic sealing ring outward, so that the outer end face of the V-shaped elastic sealing ring also makes elastic contact and seal with the sealing surface, increasing the sealing performance, ensuring good overall sealing fit, and greatly improving the anti-leakage capability of the metal ring gasket hard seal. 2. The composite material of the ring gasket of this invention is novel. The ring body is made of Ti-containing 304 stainless steel, which has good wear resistance and corrosion resistance. The material has low hardness and high toughness, making it suitable for manufacturing metal sealing ring gaskets with long service life. Hard rubber sealing rings are used at some corner positions of the V-shaped elastic sealing ring, which has excellent corrosion resistance and strong anti-leakage capability. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the installation of the present invention;

[0011] Figure 2 This is a schematic diagram of the structure after applying preload according to the present invention;

[0012] Figure 3 A schematic diagram of the ring structure when the inner sealing ring gasket is installed;

[0013] Figure 4 This is an enlarged schematic diagram of the structure without the annular arch groove;

[0014] Figure 5 for Figure 4 Enlarged schematic diagram of the cross-sectional structure of the V-shaped elastic sealing ring;

[0015] Explanation of reference numerals in the attached drawings: 1. Ring body, 2. V-groove, 3. V-shaped elastic sealing ring, 4. Extrusion sealing groove, 5. Connecting groove, 6. Hard rubber sealing ring, 7. Air storage groove, 8. Isolation ring, 9. Positioning groove, 10. C-shaped support ring, 11. Annular arch groove, 12. Elastic hoop, 13. Adhesive sealing ring, 14. Elastic rubber gasket, 15. Inner sealing ring gasket, 16. Embedded ring, 17. Expansion groove, 18. Reinforcing rib, 19. Embedded groove. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] See attached document Figure 1-2In this embodiment 1, the metal sealing ring gasket includes a metal ring body 1. The cross-sectional shape of the upper and lower end faces of the ring body 1 is trapezoidal or elliptical. V-grooves 2 are provided on both the upper and lower end faces of the ring body 1, and V-shaped elastic sealing rings 3 are provided within the V-grooves 2. The material of the ring body 1, by mass percentage, comprises: 60%–65% iron, 0.01%–0.03% carbon, 18%–20% chromium, 8%–10% nickel, 0.20%–0.30% manganese, 0.05%–0.07% silicon, and 2%–4% titanium. After the above components are mixed into powder, a ring blank is obtained using powder metallurgy or metal casting methods. Then, it is forged to form a ring preform. Finally, the ring preform is machined to obtain the required ring size. The Ti-containing 304 stainless steel metal ring prepared by this invention has a simple material composition, good wear resistance and corrosion resistance, low hardness and high toughness, long service life, light weight, and is suitable for use in the manufacture of metal sealing rings and gaskets.

[0018] During installation and use, a metal sealing ring gasket is placed between the connecting flange faces of pipes, valves, etc. After compression, the upper and lower end faces of the ring body 1 are in close contact with their respective connecting flange faces for a sealing fit. The seal is achieved through the end face or chamfered face. Due to the V-groove 2, the structural elasticity is enhanced, making it easier for the upper and lower ends of the ring body 1 to undergo elastic deformation under pressure. This ensures full and uniform contact between the ring gasket sealing surface and the connecting flange face, improving the sealing fit effect. When the V-groove 2 undergoes slight inward deformation, it compresses the V-shaped elastic sealing ring 3. The outer end face of the V-shaped elastic sealing ring 3 is in close contact with the connecting flange face, and the two sides of the V-shaped elastic sealing ring 3 are in close contact with the V-groove 2, thereby enhancing the sealing performance between the metal sealing ring gasket and the flange and greatly improving the anti-leakage capability of the metal ring gasket seal. The outer wall of the ring body 1 is provided with an annular arch groove 11, which can reduce the weight of the ring body 1 and improve its axial elasticity and radial rigidity. In use, the ring 1 is fixedly installed between the trapezoidal grooves of the two flanges. The chamfer of the metal ring gasket contacts the two inner sides of the trapezoidal groove. As the flange pressure increases, the metal ring gasket and the trapezoidal groove are tightly fitted, forming a good seal. When a certain torque is further applied to the bolts of the flange, the inner surface of the ring 1 will bulge and deform, improving its resistance to high-pressure media and thus increasing the sealing performance.

[0019] The annular arch groove 11 is provided with an elastic hoop 12, a sealing ring 13, and an elastic rubber washer 14 sequentially from the inside to the outside. The sealing ring 13 is used to bond the annular arch groove 11, the elastic hoop 12, and the elastic rubber washer 14, playing a bonding and composite role, making the three into a whole and improving the composite mechanical properties. The elastic hoop 12 can be a rubber band or a U-shaped metal spring ring. The elastic hoop 12 can provide inward clamping force to the ring body 1, making the ring body 1 uniformly stressed, reducing local internal stress, and making it less prone to cracking. The elastic rubber washer 14 provides sealing and support protection for the outer end of the annular arch groove 11, preventing the ring body 1 from rusting and corrosion and the annular arch groove 11 from collapsing, and also plays a role in shock absorption. The elastic rubber washer 14 can squeeze the glue inward, making it fully fill the gap, and finally cure into the sealing ring 13. When handling the metal ring pad, workers roll it by making the elastic rubber washer 14 contact the ground. The elastic rubber washer 14 effectively protects the metal ring pad from impacts. The elastic rubber washer 14 can be a one-piece structure or composed of multiple rubber blocks.

[0020] See attached document Figure 3 To further improve the sealing performance of the inner ring, an elastic inner sealing ring gasket 15 is fixedly installed on the inner hole of the ring body 1. The inner sealing ring gasket 15 is made of elastic rubber or soft and tough metal material. The upper and lower end faces of the inner sealing ring gasket 15 can be pressed against the flange surface to achieve a sealing connection. The inner sealing ring gasket 15 has two embedded rings 16 and two hook grooves 17 on its outer and inner sides, respectively. The embedded rings 16 correspond to the expansion grooves 17. The expansion grooves 17 can increase the inner surface area of ​​the inner sealing ring gasket 15, so that the force is evenly distributed and applied to the embedded rings 16. Several reinforcing ribs 18 are provided at intervals on the expansion grooves 17, which can improve the expansion grooves 17's resistance to collapse and ensure that the expansion grooves 17 can expand outward under the inner force to achieve sealing. The inner wall of the ring body 1 has two embedded grooves 19. The two embedded grooves 19 and the two embedded rings 16 are in concave-convex fit. When the inner sealing ring gasket 15 is compressed and expands outward, the embedded rings 16 can squeeze the embedded grooves 19, improving the sealing between the ring body and the trapezoidal groove on the flange.

[0021] See attached document Figure 4-5The V-shaped elastic sealing ring 3 has a compression sealing groove 4 at its center, and a connecting groove 5 is provided between the compression sealing groove 4 and the inner side of the outer end face of the V-shaped elastic sealing ring 3. Initially, the compression sealing groove 4 contains air, which can achieve an airtight seal on the inner gap through air pressure. When a high-pressure leak occurs on the inner side of the metal sealing ring gasket, the medium flows through the connecting groove 5 into the compression sealing groove 4, displacing the air inside. This process requires overcoming the air resistance in the compression sealing groove 4. The high-pressure medium can press the V-shaped elastic sealing ring 3 from the inside out, achieving a self-sealing effect and improving the leakage prevention capability of the outer side of the metal sealing ring gasket. The cross-sectional shape of the compression sealing groove 4 is circular, and the diameter of the circular cross-section of the compression sealing groove 4 is larger than the width of the connecting groove 5. The shell-like structure of the V-shaped elastic sealing ring 3 can increase the contact area for outward elastic deformation of the V-shaped elastic sealing ring 3. The inner side of the connecting groove 5 is tangent to the compression sealing groove 4.

[0022] A rigid rubber sealing ring 6 is installed on the outer bottom corner of the outer end face of the V-shaped elastic sealing ring 3. The rigid rubber sealing ring 6 has high rigidity and is not easily collapsed or damaged. When the V-shaped elastic sealing ring 3 is pressed outward, the rigid rubber sealing ring 6 can be embedded into the outer joint, improving the sealing ability.

[0023] The material formulation of the hard rubber sealing ring 6, by weight, includes the following substances: 10 parts natural rubber, 50 parts chloroprene rubber, 5 parts plasticizer, 10 parts palygorskite particles, 8 parts bakelite powder, 6 parts antioxidant, 5 parts N660 carbon black, 8 parts vulcanizing agent, 8 parts antimony oxide, 10 parts stearic acid, and 4 parts antioxidant. The above-mentioned materials are added to a mixer and mixed and kneaded at a temperature controlled at 125-130℃ for 3-4 hours to obtain the rubber. The rubber of this invention exhibits superior corrosion resistance, high hardness, wear resistance, and impact resistance. It is resistant to corrosion from acids, alkalis, inorganic salts, and various organic substances, and has strong anti-leakage ability.

[0024] The cross-sectional shape of the rigid rubber sealing ring 6 is a parallelogram, which allows the resultant force of the V-shaped elastic sealing ring 3 acting on the rigid rubber sealing ring 6 to be decomposed and transmitted to the sealing surface on the outside of the rigid rubber sealing ring 6.

[0025] The inner end face of the V-shaped elastic sealing ring 3 is provided with an arc-shaped air storage groove 7. The air storage groove 7 has an arched structure, which can make the V-shaped elastic sealing ring 3 form uniformly, and can form an annular air tube structure during installation, so that the V-shaped elastic sealing ring 3 can be subjected to uniform support force during installation.

[0026] An isolation ring 8 is provided in the middle of the gas storage tank 7, and a positioning groove 9 is provided at the bottom of the V-shaped groove 2. The positioning groove 9 and the isolation ring 8 are in a concave-convex sealing fit. The positioning groove 9 and the isolation ring 8 can play a positioning role for the V-shaped elastic sealing ring 3, and further improve the sealing performance between the V-shaped elastic sealing ring 3 and the V-shaped groove 2.

[0027] The extrusion sealing groove 4 is internally fitted with a C-shaped support ring 10 made of water-absorbing and expanding rubber, forming a composite structure. The C-shaped support ring 10 supports the extrusion sealing groove 4, making it less prone to collapse. When the C-shaped support ring 10 absorbs water, it expands in volume, increasing the external clamping force of the V-shaped elastic sealing ring 3 and improving the sealing performance.

[0028] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A metal sealing ring gasket, comprising a metal ring body (1), wherein the cross-sectional shape of the upper and lower end faces of the ring body (1) is trapezoidal or elliptical, characterized in that: The ring body (1) has V-grooves (2) on both the upper and lower end faces, and V-shaped elastic sealing rings (3) are provided in the V-grooves (2). The outer side wall of the ring body (1) has an annular arch groove (11). An elastic hoop (12), a sealing ring (13) and an elastic rubber gasket (14) are provided on the annular arch groove (11) from the inside to the outside. The sealing ring (13) is used to bond the annular arch groove (11), the elastic hoop (12) and the elastic rubber gasket (14). The V-shaped elastic sealing ring (3) has a compression sealing groove (4) at its center. A connecting groove (5) is provided between the compression sealing groove (4) and the inner side of the outer end face of the V-shaped elastic sealing ring (3). A C-shaped support ring (10) made of water-absorbing and expanding rubber is installed inside the compression sealing groove (4).

2. The metal sealing ring gasket according to claim 1, characterized in that: A hard rubber sealing ring (6) is installed on the outer bottom corner of the outer end face of the V-shaped elastic sealing ring (3).

3. The metal sealing ring gasket according to claim 2, characterized in that: The material formula of the hard rubber sealing ring (6) by weight includes the following substances: 10 parts natural rubber, 50 parts chloroprene rubber, 5 parts plasticizer, 10 parts palygorskite particles, 8 parts bakelite powder, 6 parts antioxidant, 5 parts N660 carbon black, 8 parts vulcanizing agent, 8 parts antimony oxide, 10 parts stearic acid, and 4 parts antioxidant. The above proportions of materials are added to a mixer and mixed and mixed in an internal mixer at a temperature controlled at 125-130℃ for 3-5 hours to obtain the rubber.

4. The metal sealing ring gasket according to claim 1, characterized in that: The material of the ring (1) by mass percentage comprises: 60% to 65% iron, 0.01% to 0.03% carbon, 18% to 20% chromium, 8% to 10% nickel, 0.20% to 0.30% manganese, 0.05% to 0.07% silicon, and 2% to 4% titanium.

5. The metal sealing ring gasket according to claim 1, characterized in that: An elastic inner sealing ring gasket (15) is fixedly installed on the inner hole of the ring body (1). The outer side of the inner sealing ring gasket (15) is provided with two embedded rings (16) and the inner side is provided with two expansion grooves (17). The embedded rings (16) and the expansion grooves (17) are positioned correspondingly. Several reinforcing ribs (18) are provided at intervals on the expansion grooves (17). The inner sidewall of the ring body (1) is provided with two embedded grooves (19). The two embedded grooves (19) and the two embedded rings (16) are in concave-convex fit.

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