High-pressure large-diameter soft sealing ball valve with anti-explosion sealing pair

Abstract

The utility model relates to the technical field of ball valves, in particular to a high-pressure large-diameter soft sealing ball valve with an anti-explosion sealing pair, which comprises a valve body and a ball body, the ball body is connected with a valve rod, and a valve seat matched with the ball body is arranged on the valve body. A compression spring is arranged in the spring hole, and the two ends of the compression spring make contact with the valve seat and the valve body respectively. A first annular mounting groove is formed in the side, close to the ball body, of the valve seat, a sealing ring II is arranged in the first annular mounting groove, a second annular mounting groove is formed between the outer side face of the sealing ring II and the valve seat, and a sealing ring I is arranged in the second annular mounting groove; the distance between the sealing ring I and the sealing surface of the ball is smaller than that between the sealing ring II and the sealing surface of the ball; and a fireproof graphite ring and an O-shaped ring are arranged between the valve seat and the valve body. A triple sealing structure is adopted, leakage of the valve can be avoided, and the service life of the valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically, to a high-pressure, large-diameter soft-seal ball valve with explosion-proof sealing pair. Background Technology

[0002] Against the backdrop of a global push for low-carbon emissions and a green transformation of the energy structure, the convergence of industry and the energy revolution is giving rise to new economic growth points. To achieve sustainable development, businesses must accelerate technological innovation, especially in energy transmission systems, where safe and reliable valves are crucial for ensuring the efficient transport of energy media such as oil, natural gas, and hydrogen.

[0003] However, traditional ball valves have a short service life and pose safety hazards due to their easily damaged sealing rings, simple structural design, and lack of fire resistance, and cannot fully meet the complex needs of modern energy systems.

[0004] Therefore, it is necessary to improve existing technologies. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a high-pressure large-diameter soft-seal ball valve with explosion-proof sealing pairs is provided, which has a longer service life, higher safety, and stronger adaptability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] An explosion-proof, high-pressure, large-diameter soft-seal ball valve includes a valve body and a ball. The ball is connected to a valve stem. A valve seat that mates with the ball is provided on the valve body. The valve seat is slidably mounted on the valve body. A spring hole is provided on the valve seat. A compression spring is provided in the spring hole. The two ends of the compression spring are in contact with the valve seat and the valve body, respectively.

[0008] The valve seat has a first annular mounting groove on the side near the ball, and a sealing ring II is provided in the first annular mounting groove. A second annular mounting groove is formed between the outer side of the sealing ring II and the valve seat, and a sealing ring I is provided in the second annular mounting groove. The distance between the sealing ring I and the sealing surface of the ball is less than the distance between the sealing ring II and the sealing surface of the ball.

[0009] A fireproof graphite ring and an O-ring are provided between the valve seat and the valve body.

[0010] Preferably, the valve seat is provided with an arc-shaped sealing surface, and the distance between the arc-shaped sealing surface and the sealing surface of the ball is less than the distance between the sealing ring I and the sealing surface of the ball.

[0011] Preferably, the outer annular surface of the valve seat includes a first annular surface, a second annular surface, and a third annular surface with successively smaller diameters. O-ring mounting grooves are provided on both the second and third annular surfaces, and the O-rings are installed in the O-ring mounting grooves.

[0012] An annular groove is provided on the second annular surface outside the O-ring mounting groove, and the fireproof graphite ring is disposed in the annular groove.

[0013] Preferably, the spring hole is disposed on the end face between the first annular surface and the second annular surface.

[0014] Preferably, the valve seat surface is coated with a 0.03mm-0.075mm thick nickel-phosphorus alloy.

[0015] Preferably, the ball and the valve stem are connected by a cross-slider coupling.

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] 1. This utility model adopts a triple sealing structure. When sealing ring I wears, the valve seat, under the action of the compression spring, drives sealing ring II to cooperate with the sealing surface of the ball to achieve a seal. When sealing ring II fails, the arc-shaped sealing surface of the valve seat approaches the sealing surface of the ball, achieving a final hard seal. This triple sealing structure can further prevent valve leakage and improve the service life of the valve.

[0018] 2. This utility model moves the center circle of the compression spring that provides the pre-tightening pressure outward, so that the second and third annular surfaces of the valve seat can use smaller diameters, thereby reducing the overall design weight of the valve seat, saving costs, improving production efficiency, and reducing the labor intensity of operators.

[0019] 3. The valve stem and the ball of this utility model are connected by a cross-slider coupling, which allows the ball to make a small radial movement relative to the valve stem. When the ball valve is in the closed state, the ball moves towards the valve seat on one side under the action of liquid pressure. The tangential force between the ball and the valve stem can be reduced by the cross-slider connecting shaft. Attached Figure Description

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 A magnified view of part A in the image;

[0023] Figure 3 This is a schematic diagram of an exploded cross-slider coupling.

[0024] In the diagram: 1-valve body, 2-ball, 3-valve stem, 4-valve seat, 41-spring hole, 42-compression spring, 43-first annular mounting groove, 44-sealing ring II, 45-sealing ring I, 46-arc-shaped sealing surface, 47-first annular surface, 48-second annular surface, 49-third annular surface, 410-O-ring mounting groove, 411-annular groove, 5-fireproof graphite ring, 6-O-ring, 7-cross slider coupling. Detailed Implementation

[0025] 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.

[0026] Example:

[0027] like Figures 1 to 3 As shown, a high-pressure large-diameter soft-seal ball valve with explosion-proof sealing pair includes a valve body 1 and a ball 2. The ball 2 is disposed inside the valve body 1. Valve seats 4 that cooperate with the ball 2 are provided on both sides of the inner cavity of the valve body 1. The ball 2 is connected to a valve stem 3, and the rotation of the ball 2 is controlled by the valve stem 3.

[0028] The valve seat 4 is slidably connected to the valve body 1. The outer ring surface of the valve seat 4 includes a first annular surface 47, a second annular surface 48 and a third annular surface 49 with successively smaller diameters. Both the second annular surface 48 and the third annular surface 49 are provided with O-ring mounting grooves 410. O-rings 6 are provided in the O-ring mounting grooves 410 for sealing.

[0029] An annular groove 411 is provided on the second annular surface 48 outside the O-ring mounting groove. A fireproof graphite ring 5 is placed in the annular groove 411 to provide flame retardancy.

[0030] A spring hole 41 is provided on the valve seat 4, and a compression spring 42 is provided in the spring hole 41. The two ends of the compression spring 42 are in contact with the valve seat 4 and the valve body 1 respectively. The compression spring 42 provides a pre-tightening pressure so that the sealing element of the valve seat 4 is pressed tightly against the sealing surface of the ball.

[0031] Preferably, the spring hole 41 is located on the end face between the first annular surface 47 and the second annular surface 48. By moving the compression spring outward, the design weight of the entire valve seat is reduced, saving costs, improving production efficiency, and reducing the labor intensity of operators.

[0032] A first annular mounting groove 43 is provided on the side of the valve seat 4 near the ball 2. A sealing ring II 44 is provided in the first annular mounting groove 43. A second annular mounting groove is formed between the outer surface of the sealing ring II 44 and the valve seat 4. A sealing ring I 45 is provided in the second annular mounting groove. The distance between the sealing ring I 45 and the sealing surface of the ball 2 is less than the distance between the sealing ring II 44 and the sealing surface of the ball 2. An arc-shaped sealing surface 46 is provided on the valve seat 4. The distance between the arc-shaped sealing surface 46 and the sealing surface of the ball 2 is less than the distance between the sealing ring I 45 and the sealing surface of the ball 2. Preferably, when the sealing ring I 45 and the sealing surface of the ball 2 are in normal fit, the distance between the arc-shaped sealing surface 46 and the sealing surface of the ball 2 is 1 mm.

[0033] When the sealing ring I45 wears out, the valve seat 4, under the action of the compression spring 42, drives the sealing ring II44 to cooperate with the sealing surface of the ball 2 to achieve a seal. When the sealing ring II44 fails, the arc-shaped sealing surface 46 of the valve seat 4 approaches the sealing surface of the ball 2 to achieve the final hard seal.

[0034] Preferably, the surface of the valve seat 4 is coated with a 0.03mm-0.075mm thick nickel-phosphorus alloy. This achieves wear resistance, corrosion resistance, high pressure resistance, and high temperature resistance, effectively reducing the free movement and penetration of media molecules into the interior of the parts.

[0035] Preferably, the ball 2 and the valve stem 3 are connected by a cross-slider coupling 7. By utilizing the characteristic that the two rotating shafts of the cross-slider coupling can be non-concentric, the tangential force between the ball 2 and the valve stem 3 is reduced.

[0036] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A high-pressure, large-diameter soft-seal ball valve with explosion-proof sealing, comprising a valve body (1) and a ball (2), wherein the ball (2) is connected to a valve stem (3), and a valve seat (4) that mates with the ball (2) is provided on the valve body (1), characterized in that: The valve seat (4) is slidingly arranged on the valve body (1), the valve seat (4) is provided with a spring hole (41), the spring hole (41) is provided with a compression spring (42), and two ends of the compression spring (42) are in contact with the valve seat (4) and the valve body (1) respectively. The valve seat (4) is provided with a first annular mounting groove (43) on the side close to the ball (2), the first annular mounting groove (43) is provided with a sealing ring II (44), a second annular mounting groove is formed between the outer side surface of the sealing ring II (44) and the valve seat (4), the second annular mounting groove is provided with a sealing ring I (45), and the distance between the sealing ring I (45) and the sealing surface of the ball (2) is less than the distance between the sealing ring II (44) and the sealing surface of the ball (2). The valve seat (4) and the valve body (1) are provided with a fireproof graphite ring (5) and an O-shaped ring (6).

2. The anti-explosion sealing pair high-pressure large-diameter soft sealing ball valve according to claim 1, characterized in that: The valve seat (4) is provided with an arc-shaped sealing surface (46), and the distance between the arc-shaped sealing surface (46) and the sealing surface of the ball (2) is less than the distance between the sealing ring I (45) and the sealing surface of the ball (2).

3. The anti-explosion sealing pair high-pressure large-diameter soft sealing ball valve according to claim 1, characterized in that: The outer annular surface of the valve seat (4) comprises a first annular surface (47), a second annular surface (48) and a third annular surface (49) with gradually decreasing diameters, the second annular surface (48) and the third annular surface (49) are provided with O-shaped ring mounting grooves (410), and the O-shaped ring (6) is mounted in the O-shaped ring mounting grooves (410). The second annular surface (48) is provided with an annular groove (411) outside the O-shaped ring mounting groove, and the fireproof graphite ring (5) is arranged in the annular groove (411).

4. The anti-explosion sealing pair high-pressure large-diameter soft sealing ball valve according to claim 3, characterized in that: The spring hole (41) is arranged on the end surface between the first annular surface (47) and the second annular surface (48).

5. The anti-explosion sealing pair high-pressure large-diameter soft sealing ball valve according to claim 1, characterized in that: The surface of the valve seat (4) is sprayed with 0.03mm-0.075mm nickel-phosphorus alloy.

6. The anti-explosion sealing pair high-pressure large-diameter soft sealing ball valve according to claim 1, characterized in that: The ball (2) and the valve rod (3) are connected through a cross slider coupling (7).

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