Hard sealing ball valve with anti-blocking structure and superhard coating

Abstract

The utility model provides a hard sealing ball valve with an anti-blocking structure and a superhard coating, which comprises a main valve body and an auxiliary valve body, and valve seat components are arranged in an inner cavity of the main valve body and an inner cavity of the auxiliary valve body. An adjusting pad, a shaft sleeve and a sealing piece are arranged among the valve rod, the ball core and the stuffing box, foreign matter is prevented from entering a gap between the valve rod and the stuffing box, and the phenomenon that the valve rod is stuck during rotation is prevented; an adjusting pad, a shaft sleeve and a sealing piece are arranged between the bottom shaft and the ball core, foreign matter is prevented from entering a gap between the bottom shaft and the ball core, and the phenomenon that the ball core is stuck during rotation is prevented; valve seat assemblies are arranged in an inner cavity of the main valve body and an inner cavity of the auxiliary valve body, metal corrugated pipes in the valve seat assemblies are welded to the inner cavities of the valve bodies, sealing pieces are arranged between the other ends of valve seats and the valve bodies, foreign matter is prevented from entering gaps between the valve seats and the valve bodies, and the phenomenon that the valve seats are stuck is prevented; the ball core adopts stainless steel matrix spray welding hard alloy and a superhard coating, so that the service life of the valve is prolonged, and the valve is particularly suitable for high-frequency opening and closing and wear-resistant harsh working condition occasions.

Description

Technical Field

[0001] The utility model relates to the field of valves, and in particular to a hard-sealed ball valve with an anti-sticking structure and a super-hard coating. Background Art

[0002] In the modern industrial system, the petroleum, petrochemical, chemical, electric power, and natural gas industries occupy a vital position, and their stable operation plays a key supporting role in the development of the national economy and the normal operation of society. In the production process of these industries, valves are key components for controlling fluid delivery, and their performance and quality are directly related to the safety, stability, and efficiency of the entire system. The Chinese utility model patent application number: CN201721515718.X proposes a new type of hard-sealed ball valve, including a valve stem and a valve body, the valve body includes a joint, a ball hole and a flow channel are arranged inside the joint, a ball is installed in the ball hole, a socket is arranged on the ball, the socket and the flow channel can be connected, the diameter of the ball is larger than the area of ​​the flow channel cross section, and the flow channel and the socket are used for the flow of water; one end of the valve stem is inserted into the ball, and the valve stem can drive the ball to rotate and adjust the overlap between the socket and the flow channel.

[0003] In actual application scenarios, hard-sealed ball valves face complex and harsh working conditions. A large amount of slag, catalyst solid particle impurities will be generated during the operation. When the fluid containing these impurities flows in the pipeline and passes through the hard-sealed ball valve, it will cause serious wear to the internal parts of the ball valve. Under the action of long-term scouring and friction, the valve seat and the ball core of the ball valve will gradually show signs of wear, resulting in a decrease in sealing performance and internal leakage of the valve. Once the valve leaks internally, it will not only cause a waste of fluid, but also may cause safety accidents. For example, the leakage of flammable and explosive fluids may cause fire and explosion hazards, and the leakage of toxic and harmful fluids will pose a serious threat to the environment and personnel health.

[0004] In addition, wear and tear will also affect the smoothness of the valve opening and closing process. Slag and catalyst impurities may enter the gap between the valve seat and the valve body, between the ball core and the shaft, and between the valve stem and the stuffing box, causing these parts to be blocked during movement and become stuck and not smooth. This not only increases the difficulty of operation and reduces work efficiency, but may also cause the valve to fail to accurately achieve the opening and closing action, affecting the normal operation of the entire equipment and device.

[0005] In some occasions where production continuity is extremely high, such as the continuous production process of large chemical plants, valve jamming or failure may cause the entire production line to shut down, resulting in huge economic losses. Therefore, how to improve the wear resistance and anti-jamming performance of hard-sealed ball valves has become an important issue that needs to be solved in the current industrial field.

[0006] Traditional hard-sealed ball valves often fail to meet actual needs when facing these complex working conditions. Their structural design and material selection may not effectively resist the wear and erosion of slag and catalyst impurities, and are prone to seal failure and jamming. Therefore, we have made improvements to this and proposed a hard-sealed ball valve with an anti-jamming structure and super-hard coating. Utility Model Content

[0007] The purpose of the utility model is to address the problems raised by the existing background technology. In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions: a hard-sealed ball valve with an anti-stuck structure and a super-hard coating, comprising a main valve body and an auxiliary valve body, a sealing gasket is provided between the main valve body and the auxiliary valve body, a ball core is provided between the main valve body and the auxiliary valve body, a bottom shaft is installed in the hole of the ball core, and valve seat assemblies are provided in the inner cavity of the main valve body and the inner cavity of the auxiliary valve body.

[0008] As an optimal technical solution of the present invention, the metal bellows in the valve seat assembly is welded to the inner cavity of the main valve body, a spring seat is arranged on the side of the metal bellows, a spring is arranged above the spring seat, a valve seat is arranged on the side of the spring seat, a sealing ring is arranged at one end of the valve seat, a second sealing member is arranged between the other end of the valve seat and the main valve body, a pressure ring is arranged on the side of the second sealing member, a retaining ring is arranged on the upper end surface of the pressure ring, a sealing ring is arranged through one end of the valve seat, and a second sealing member is arranged between the other end of the valve seat and the main valve body to prevent foreign matter from entering the gap between the valve seat and the valve body, thereby preventing the valve seat from getting stuck.

[0009] As a preferred technical solution of the utility model, a first adjustment pad, a first sleeve and a first seal are provided between the bottom shaft and the ball core to prevent foreign matter from entering the gap between the bottom shaft and the ball core, thereby preventing the ball core from getting stuck when rotating.

[0010] As a preferred technical solution of the utility model, a sealing gasket is provided between the bottom shaft and the main valve body, and the bottom shaft and the main valve body are connected by a first hexagon socket screw;

[0011] As a preferred technical solution of the utility model, a stuffing box is provided between the main valve body and the valve stem, and a stuffing box is provided with a stuffing and a stuffing gland, and the valve stem is installed in the hole of the ball core.

[0012] As a preferred technical solution of the utility model, a second adjustment pad and a third sleeve are installed between the stuffing box and the valve stem, and a second sleeve and a third seal are provided between the stuffing box and the ball core.

[0013] As a preferred technical solution of the utility model, a second adjustment pad, a third sleeve and a third seal are provided between the valve stem, the ball core and the stuffing box to prevent foreign matter from entering the gap between the valve stem and the stuffing box, thereby preventing the valve stem from getting stuck when rotating.

[0014] As a preferred technical solution of the utility model, a connecting plate is installed above the stuffing box, a sealing gasket is provided between the main valve body and the stuffing gland, and they are connected by a second hexagonal nut and a second stud.

[0015] As a preferred technical solution of the utility model, the main valve body and the auxiliary valve body are connected by using a first hexagonal nut and a first stud.

[0016] As the preferred technical solution of the utility model, the ball core adopts a stainless steel substrate, and the substrates of the ball core and the valve seat are spray-welded with hard alloy and superhard coating, which improves the service life of the valve and is particularly suitable for high-frequency switching and wear-resistant harsh working conditions.

[0017] Compared with the prior art, the utility model has the following beneficial effects: an adjustment pad, a shaft sleeve and a seal are arranged between the valve stem, the ball core and the stuffing box, so as to prevent foreign matter from entering the gap between the valve stem and the stuffing box, and prevent the valve stem from getting stuck when rotating;

[0018] The utility model provides an adjustment pad, a shaft sleeve and a sealing member between the bottom shaft and the ball core, which prevents foreign matter from entering the gap between the bottom shaft and the ball core, and prevents the ball core from getting stuck when rotating.

[0019] The utility model provides valve seat assemblies in both the inner cavity of the main valve body and the inner cavity of the auxiliary valve body. The metal bellows in the valve seat assembly is welded to the inner cavity of the valve body. A sealing member is provided between the other end of the valve seat and the valve body to prevent foreign matter from entering the gap between the valve seat and the valve body, thereby preventing the valve seat from getting stuck.

[0020] The utility model ball core is installed between the main valve body seat and the auxiliary valve body seat. The ball core adopts a stainless steel base spray-welded hard alloy and a super-hard coating, which increases the service life of the valve and is particularly suitable for high-frequency switching and wear-resistant harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is a schematic diagram of the valve seat assembly structure of the utility model:

[0023] Figure 3 This is a schematic diagram of the valve stem anti-stuck structure of the utility model:

[0024] Figure 4 This is a schematic diagram of the bottom shaft anti-stuck structure of the utility model:

[0025] Figure 5 This is a schematic diagram of the structure of the superhard coating of the sealing pair of the utility model.

[0026] Indicated in the figure:

[0027] 1. Bottom shaft; 2. First hexagon socket screw; 3. Main valve body; 4. First adjustment pad; 5. First sealing element; 6. First sleeve;

[0028] 7A, valve seat assembly; 7A1, metal bellows; 7A2, spring seat; 7A3, spring; 7A4, valve seat; 7A5, sealing ring; 7A6, second sealing member; 7A7, pressure ring; 7A8, clamping ring;

[0029] 8. Ball core; 9. Valve stem; 10. Second sleeve; 11. Third seal; 12. Second adjustment pad; 13. Third sleeve; 14. Stuffing box; 15. Sealing pad; 16. Packing; 17. Connecting plate; 18. Second hexagon socket screw; 19. Packing gland; 20. First hexagon nut; 21. First stud; 22. Auxiliary valve body; 23. Second hexagon nut; 24. Second stud; 25. Cemented carbide; 26. Superhard coating. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0031] Therefore, the following detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model for which protection is sought, but merely represents some embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. It should be noted that the embodiments of the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] Example 1: Please refer to Figure 1-Figure 5A hard-sealed ball valve with an anti-sticking structure and a super-hard coating comprises a main valve body 3 and an auxiliary valve body 22, a sealing gasket 15 is arranged between the main valve body 3 and the auxiliary valve body 22, a ball core 8 is arranged between the main valve body 3 and the auxiliary valve body 22, a bottom shaft 1 is installed in the hole of the ball core 8, and valve seat assemblies 7A are arranged in the inner cavities of the main valve body 3 and the auxiliary valve body 22. The metal bellows 7A1 in the valve seat assembly 7A is welded to the inner cavity of the main valve body 3, a spring seat 7A2 is arranged on the side of the metal bellows 7A1, a spring 7A3 is arranged above the spring seat 7A2, a valve seat 7A4 is arranged on the side of the spring seat 7A2, a sealing ring 7A5 is arranged at one end of the valve seat 7A4, a second sealing member 7A6 is arranged between the other end of the valve seat 7A4 and the main valve body 3, a pressure ring 7A7 is arranged on the side of the second sealing member 7A6, a clamping ring 7A8 is arranged on the upper end surface of the pressure ring 7A7, a sealing ring 7A5 is arranged through one end of the valve seat 7A4, and a second sealing member 7A6 is arranged between the other end of the valve seat 7A4 and the main valve body 3 to prevent foreign matter from entering the gap between the valve seat and the valve body, thereby preventing the valve seat from getting stuck.

[0033] A first adjustment pad 4, a first sleeve 6 and a first seal 5 are provided between the bottom shaft 1 and the ball core 8 to prevent foreign matter from entering the gap between the bottom shaft and the ball core, and to prevent the ball core from getting stuck when rotating. A seal 15 is provided between the bottom shaft 1 and the main valve body 3, and the bottom shaft 1 and the main valve body 3 are connected by a first hexagon socket screw 2; a stuffing box 14 is provided between the main valve body 3 and the valve stem 9, and a stuffing 16 and a stuffing gland 19 are provided in the stuffing box 14, and the valve stem 9 is installed in the hole of the ball core 8. A second adjustment pad 12 and a third sleeve 13 are provided between the stuffing box 14 and the valve stem 9, and a second sleeve 10 and a third seal 11 are provided between the stuffing box 14 and the ball core 8.

[0034] A second adjustment pad 12, a third sleeve 13 and a third seal 11 are provided between the valve stem 9, the ball core 8 and the stuffing box 14 to prevent foreign matter from entering the gap between the valve stem and the stuffing box, and to prevent the valve stem from getting stuck when rotating. A connecting plate 17 is installed above the stuffing box 14, and a sealing pad 15 is provided between the main valve body 3 and the stuffing gland 19, and they are connected by a second hexagonal nut 23 and a second stud 24. The main valve body 3 and the auxiliary valve body 22 are connected by a first hexagonal nut 20 and a first stud 21. The ball core 8 adopts a stainless steel base, and the bases of the ball core 8 and the valve seat 7A4 are spray-welded with hard alloy 25 and superhard coating 26, which increases the service life of the valve and is particularly suitable for high-frequency switching and wear-resistant harsh working conditions.

[0035] The working principle of the utility model is that the valve seat assembly 7A is a key component to prevent the valve seat from getting stuck. The metal bellows 7A1 is welded to the inner cavity of the main valve body 3, which plays a connecting and certain buffering role. The spring seat 7A2 and the spring 7A3 provide elastic support for the valve seat 7A4, so that the valve seat can fit closely with the ball core 8 to ensure the sealing performance. A sealing ring 7A5 is provided at one end of the valve seat 7A4, and a second sealing member 7A6 is provided between the other end and the main valve body 3. These two sealing components form a double protection to prevent foreign matter in the fluid from entering the gap between the valve seat and the valve body. Once foreign matter enters, the valve seat may not be able to move flexibly during the rotation of the ball, resulting in a stuck phenomenon. The presence of the sealing ring 7A5 and the second sealing member 7A6 can effectively avoid this situation and ensure that the valve seat always maintains good activity performance. The pressure ring 7A7 and the clamping ring 7A8 play a role of fixing and limiting to ensure the relative position stability of the various components of the valve seat assembly.

[0036] The bottom shaft 1 is installed in the hole of the ball core 8, and a first adjustment pad 4, a first sleeve 6 and a first seal 5 are arranged between them. The first adjustment pad 4 can be used to adjust the gap between the bottom shaft and the ball core to ensure the matching accuracy; the first sleeve 6 plays a role of supporting and reducing friction, so that the ball core can rotate flexibly on the bottom shaft; the first seal 5 prevents foreign matter from entering the gap between the bottom shaft and the ball core. If foreign matter enters the gap, it will increase the resistance to the rotation of the ball core, and even cause the ball core to get stuck and unable to rotate. These sealing and protective components effectively prevent the ball core from getting stuck when rotating. The valve stem 9 is installed in the hole of the ball core 8, and a stuffing box 14 is arranged between the main valve body 3 and the valve stem 9. The stuffing 16 in the stuffing box 14 plays a sealing role to prevent fluid leakage. The stuffing gland 19 is used to compress the stuffing to ensure the sealing effect.

[0037] A second adjustment pad 12 and a third sleeve 13 are installed between the stuffing box 14 and the valve stem 9, and a second sleeve 10 and a third seal 11 are installed between the stuffing box 14 and the ball core 8. The second adjustment pad 12 can adjust the gap between the valve stem and the stuffing box; the third sleeve 13 reduces the friction when the valve stem rotates; the second sleeve 10 supports the valve stem and ensures its rotation stability; the third seal 11 prevents foreign matter from entering the gap between the valve stem and the stuffing box. These components work together to prevent the valve stem from getting stuck due to foreign matter entering during rotation.

[0038] A sealing gasket 15 is provided between the bottom shaft 1 and the main valve body 3, and they are connected by a first hexagon socket screw 2. The sealing gasket 15 prevents fluid from leaking from the connection between the bottom shaft and the main valve body, and the first hexagon socket screw 2 ensures the firmness of the connection.

[0039] A sealing gasket 15 is provided between the main valve body 3 and the auxiliary valve body 22, and the first hexagonal nut 20 and the first stud 21 are used to connect them. The sealing gasket 15 prevents fluid leakage at the connection part of the main and auxiliary valve bodies, and the first hexagonal nut 20 and the first stud 21 tightly connect the main and auxiliary valve bodies together.

[0040] A sealing gasket 15 is provided between the main valve body 3 and the packing gland 19, and they are connected by a second hexagonal nut 23 and a second stud 24. The sealing gasket 15 prevents fluid leakage from the connection between the main valve body and the packing gland, and the second hexagonal nut 23 and the second stud 24 ensure the reliability of the connection.

[0041] The ball core 8 is made of stainless steel substrate, and hard alloy 25 and super-hard coating 26 are spray-welded on the substrates of the ball core 8 and the valve seat 7A4. The hard alloy 25 has high hardness and wear resistance, and can withstand the erosion and friction of particles in the fluid; the super-hard coating 26 further improves the hardness and wear resistance of the ball core and the valve seat surface. Under high-frequency switching conditions, the ball core and the valve seat frequently contact and move relative to the fluid. The super-hard coating can effectively reduce wear and greatly increase the service life of the valve, so that it can adapt to working conditions with demanding wear resistance requirements.

[0042] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or replacement of the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A hard-sealed ball valve with an anti-sticking structure and a super-hard coating, comprising a main valve body (3) and an auxiliary valve body (22), wherein a sealing gasket (15) is provided between the main valve body (3) and the auxiliary valve body (22), and characterized in that: A ball core (8) is arranged between the main valve body (3) and the auxiliary valve body (22), a bottom shaft (1) is inserted into the hole of the ball core (8), and valve seat assemblies (7A) are provided in the inner cavities of the main valve body (3) and the auxiliary valve body (22).

2. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 1, characterized in that: The metal bellows (7A1) in the valve seat assembly (7A) is welded to the inner cavity of the main valve body (3); a spring seat (7A2) is arranged on the side of the metal bellows (7A1); a spring (7A3) is arranged above the spring seat (7A2); a valve seat (7A4) is arranged on the side of the spring seat (7A2); a sealing ring (7A5) is arranged at one end of the valve seat (7A4); a second sealing member (7A6) is arranged between the other end of the valve seat (7A4) and the main valve body (3); a pressure ring (7A7) is arranged on the side of the second sealing member (7A6); and a retaining ring (7A8) is arranged on the upper end surface of the pressure ring (7A7).

3. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 1, characterized in that: A first adjustment pad (4), a first shaft sleeve (6) and a first sealing member (5) are provided between the bottom shaft (1) and the ball core (8).

4. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 3, characterized in that: A sealing gasket (15) is provided between the bottom shaft (1) and the main valve body (3), and the bottom shaft (1) and the main valve body (3) are connected by a first hexagon socket screw (2).

5. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 4, characterized in that: A stuffing box (14) is provided between the main valve body (3) and the valve stem (9), and a stuffing box (14) is provided with a stuffing (16) and a stuffing gland (19). The valve stem (9) is inserted into the hole of the ball core (8).

6. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 5, characterized in that: A second adjustment pad (12) and a third shaft sleeve (13) are arranged between the stuffing box (14) and the valve stem (9), and a second shaft sleeve (10) and a third sealing member (11) are arranged between the stuffing box (14) and the ball core (8).

7. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 6, characterized in that: A second adjustment pad (12), a third shaft sleeve (13) and a third sealing member (11) are provided between the valve stem (9), the ball core (8) and the stuffing box (14).

8. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 7, characterized in that: A connecting plate (17) is installed above the stuffing box (14), and a sealing gasket (15) is provided between the main valve body (3) and the stuffing gland (19), and the two are connected by a second hexagonal nut (23) and a second stud bolt (24).

9. The hard-sealed ball valve with an anti-sticking structure and super-hard coating according to claim 1, characterized in that: The main valve body (3) and the auxiliary valve body (22) are connected by means of a first hexagonal nut (20) and a first stud bolt (21).

10. The hard-sealed ball valve with anti-sticking structure and super-hard coating according to claim 1, characterized in that: The ball core (8) adopts a stainless steel substrate, and hard alloy (25) and superhard coating (26) are spray-welded on the substrates of the ball core (8) and the valve seat (7A4).

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