A wear-resistant ball valve and a spraying method for a tungsten carbide and DLC composite coating

Abstract

The present invention discloses a wear-resistant ball valve and a method for spraying a tungsten carbide and DLC composite coating, specifically relating to the field of ball valves. The valve valve comprises two detachably connected valve bodies, wherein a valve core is provided inside the valve body, and a through hole extending in the same direction as the valve body is passed through the valve core. A valve seat is installed inside each valve body, and the valve seat is sleeved on the outside of the valve core. A base is installed at the bottom of one of the valve bodies, and a lower shaft is installed at the end of the base located inside the valve body. The lower shaft is inserted into the valve core, and the extended axis of the lower shaft coincides with the spherical center of the valve core. A driver is installed on the top of one of the valve bodies. The present invention reduces the contact pressure between the sealing ring and the valve core surface when the valve core changes state by providing a ridge on the spherical surface of the valve core, thereby reducing the friction between the sealing ring and the valve core, greatly improving the wear resistance of the valve core, and further extending the service life of the valve core by spraying a tungsten carbide and DLC composite coating on the ridge.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and more particularly to a wear-resistant ball valve and a spraying method of a tungsten carbide and DLC composite coating. Background Art

[0002] Ball valves are widely used in aerospace, petroleum, natural gas, long-distance pipelines, light industry, and food processing industries due to their low flow resistance, rapid opening and closing, excellent sealing performance, long service life, and ease of pneumatic and electronic control. With the rise of industries such as coal chemical industry in recent years, ball valves have become increasingly popular due to their excellent sealing performance and long service life under high-temperature, high-pressure, and high-wear conditions.

[0003] Ball valves achieve sealing by creating a sufficient sealing pressure ratio between the preload force set between the valve seat and ball, combined with the force generated by the medium pressure on the seat sealing surface. This preload is typically achieved by inserting an elastic element, such as a cylindrical spring or disc spring, between the seat and body. During the opening and closing process, the preload force between the seat and ball, as well as the medium pressure, constantly acts on the sealing surface between the seat and ball. Therefore, the opening and closing torque of a ball valve is greater than that of other valve types. Furthermore, the sealing surface between the seat and ball in a ball valve is more susceptible to wear.

[0004] During the opening or closing process of a wear-resistant ball valve, the valve seat and the ball sealing surface always maintain contact. Due to the large contact area between the valve seat and the ball sealing surface, the friction torque that needs to be overcome is large, which intensifies the wear between the valve seat and the ball sealing surface and shortens the service life of the ball valve. Summary of the Invention

[0005] The present invention provides a wear-resistant ball valve and a spraying method for a tungsten carbide and DLC composite coating, aiming to solve the problem that the existing ball valve has poor wear resistance.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a wear-resistant ball valve, comprising two detachably connected valve bodies, a valve core provided inside the valve bodies, a through hole extending in the same direction as the valve bodies, valve seats installed inside both valve bodies, and the valve seats sleeved outside the valve cores, a base installed at the bottom of one of the valve bodies, a lower shaft installed at the end of the base located inside the valve body, the lower shaft inserted into the valve core, and an extended axis of the lower shaft coincident with the spherical center of the valve core, a driver installed at the top of one of the valve bodies, the driver driving the valve core to rotate in the valve body to realize the opening and closing of the ball valve;

[0007] A sealing ring is embedded inside the valve seat, and an annular ridge is integrally formed on the spherical surface of the valve core. The ridge is adapted to the sealing ring, and when the ball valve is in the open and closed states, the ridge close to the valve seat is always in close contact with the sealing ring, thereby achieving sealing of the valve core in the valve body.

[0008] In a preferred embodiment, four ribs are provided and distributed around the axis of the lower shaft, and two opposing ribs are coaxially arranged with the through hole, and the center line connecting the other two opposing ribs is perpendicular to the axis of the through hole.

[0009] In a preferred embodiment, leakage areas are formed on the surface of the valve core above and below the overlapping points of two adjacent ridges. When the driver drives the valve core to rotate in the valve body, when the ridge is separated from the sealing ring, the leakage area is connected to the medium channel inside the valve body; when the ridge is in close contact with the sealing ring, the leakage area and the medium channel inside the valve body are closed.

[0010] In a preferred embodiment, a valve stem passes through the top of the valve body, the top end of the valve stem is connected to the driving end of the driver, a mounting groove is opened on the surface of the valve core, and the bottom end of the valve stem is matched with the mounting groove.

[0011] In a preferred embodiment, an inner chamber is formed between the top and bottom of the valve core and the interior of the valve body, the inner chamber is connected to the leakage area, and sealing plates are installed on the shafts of the lower shaft and the valve stem. The internal pressure of the inner chamber increases, driving the sealing plate along the axial direction of the lower shaft or the valve stem to approach the inner wall of the valve body.

[0012] In a preferred embodiment, an elastic bellows is fixedly sleeved on the shaft of the valve stem, and the top of the elastic bellows is fixedly connected to the bottom of the sealing plate.

[0013] In a preferred embodiment, a plurality of staggered stepped holes are provided on the top of the sealing plate, and a plurality of channels connected to the stepped holes are provided on the outer peripheral side of the sealing plate. The channels are spiral trajectories, and the rotation directions of the plurality of channels are the same. Cleaning channels are passed through the top and bottom of the valve body, and a cleaner is connected to the end of the cleaning channel outside the valve body.

[0014] In a preferred embodiment, the inner wall of the valve body is provided with a plurality of protrusions, and the plurality of protrusions corresponds one-to-one to the plurality of stepped holes.

[0015] A method for spraying a tungsten carbide / DLC composite coating comprises the following steps:

[0016] S1, clean the valve core surface;

[0017] S2, tungsten carbide is injected into the ridges on the surface of the valve core by ion implantation, so that a transition layer of tungsten carbide and steel is formed on the surface of the ridges;

[0018] S3, spraying primer on the ridge surface and drying the primer;

[0019] S4, spraying a composite coating of tungsten carbide and DLC on the surface of the ridge along the spraying track of the spray primer, and drying the coating.

[0020] Technical effects and advantages of the present invention:

[0021] 1. The present invention provides ridges on the spherical surface of the valve core, thereby reducing the contact pressure between the sealing ring and the valve core surface when the valve core is changing state, thereby reducing the friction between the sealing ring and the valve core, greatly improving the wear resistance of the valve core. In addition, the composite coating of tungsten carbide and DLC sprayed on the ridges is more conducive to extending the service life of the valve core.

[0022] 2. In the present invention, the medium rushes into the inner chamber in the medium channel, increasing the pressure in the chamber and pushing the sealing plate upward. The protruding columns and stepped holes are staggered and plugged in to block the top of the inner cavity of the valve body, thereby preventing the medium from leaking from the top of the valve body and improving the sealing performance of the sealing plate.

[0023] 3. The present invention presses cleaning water into the inner chamber, driving the sealing plate to move along the axis. At the same time, the water flows into the stepped hole and is guided by the inclined channel to form a forward or reverse rotating water flow on the outer peripheral side of the sealing plate and sprayed toward the surrounding of the inner chamber, thereby performing high-pressure flushing on the difficult-to-clean parts of the inner wall of the inner chamber to improve the cleaning effect. On the other hand, the sprayed water flow in the same rotation direction will drive the sealing plate to rotate, oscillating the water in the chamber, further improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the overall structure of the present invention;

[0025] Figure 2 It is a side view schematic diagram of the overall structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Schematic cross-section from a medium AA perspective;

[0027] Figure 4 Schematic diagram of the structure of the valve core and valve seat of the present invention;

[0028] Figure 5 This is a front view structural diagram of the valve core and valve seat of the present invention;

[0029] Figure 6 Schematic diagram of the three-dimensional structure of the valve core of the present invention;

[0030] Figure 7 For the present invention Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0031] Figure 8 Schematic diagram of the structure of the sealing plate of the present invention;

[0032] Figure 9 A schematic top view of the cross-sectional structure of the sealing plate of the present invention.

[0033] The accompanying drawings are marked as follows: 1. Valve body; 11. Base; 12. Lower shaft; 2. Driver; 21. Valve stem; 3. Valve core; 31. Through hole; 32. Mounting groove; 33. Raised ridge; 34. Leakage area; 4. Valve seat; 41. Sealing ring; 5. Inner chamber; 6. Sealing plate; 61. Stepped hole; 62. Channel; 7. Cleaning channel; 8. Cleaner; 9. Elastic bellows. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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. Example

[0035] Refer to the instruction manual Figures 1 to 9 , a wear-resistant ball valve, comprising two detachable valve bodies 1, a valve core 3 is provided inside the valve body 1, and the valve core 3 is penetrated by a through hole 31 in the same direction as the valve body 1, a valve seat 4 is installed inside the two valve bodies 1, and the valve seat 4 is sleeved outside the valve core 3, a base 11 is installed at the bottom of one of the valve bodies 1, a lower shaft 12 is installed at the end of the base 11 located inside the valve body 1, the lower shaft 12 is inserted into the valve core 3, and the extended axis of the lower shaft 12 coincides with the spherical center of the valve core 3, a driver 2 is installed on the top of one of the valve bodies 1, and the driver 2 drives the valve core 3 to rotate in the valve body 1 to realize the opening and closing of the ball valve;

[0036] A sealing ring 41 is embedded inside the valve seat 4, and an annular ridge 33 is integrally formed on the spherical surface of the valve core 3. The ridge 33 is adapted to the sealing ring 41, and when the ball valve is in the open and closed states, the ridge 33 close to the valve seat 4 is always in close contact with the sealing ring 41, thereby achieving sealing of the valve core 3 in the valve body 1.

[0037] In this embodiment, the implementation scenario is specifically as follows: the valve seat 4 is embedded in the interior of the valve body 1 and seals the side wall of the valve body 1, so that the medium can only flow into the center hole of the valve seat 4 from the end of the valve body 1. The output end of the driver 2 is connected to the top of the valve core 3, and the outer surface of the valve core 3 is in close contact with the valve seat 4. When the through hole 31 of the valve core 3 rotates to coincide with the center hole of the valve seat 4, the ball valve opens, and the medium flows from the end of the valve body 1 through the center hole of the valve seat 4, and then flows out from the port of the other valve body 1 through the through hole 31; when the ball valve needs to be closed, the driver 2 controls the valve core 3 to rotate 90 degrees clockwise or counterclockwise until the axis of the through hole 31 is perpendicular to the axis of the center hole of the valve seat 4. At this time, the valve core 3 isolates the left and right valve bodies 1, thereby achieving closure of the ball valve;

[0038] By providing a ridge 33 on the spherical surface of the valve core 3, since the sealing ring 41 is in a close contact state when cooperating with the ridge 33, when the driver 2 controls the valve core 3 to rotate, the portion of the valve core 3 surface that is in tight contact with the sealing ring 41 is only the ridge 33. When the sealing ring 41 contacts other surfaces of the valve core 3 (except the ridge 33), the sealing ring 41 changes from a tight compression state to a slightly loose compression state, thereby reducing the pressure between the sealing ring 41 and the surface of the valve core 3, and further reducing the friction between the sealing ring 41 and the valve core 3, greatly improving the wear resistance of the valve core 3, and combined with the composite coating of tungsten carbide and DLC sprayed on the ridge 33, it is more conducive to extending the service life of the valve core 3.

[0039] The rib 33 is provided with four ribs (such as Figure 6 As shown), the two opposing ridges 33 are coaxially arranged with the through hole 31, and the center line of the two opposing ridges 33 is perpendicular to the axis of the through hole 31; this is conducive to ensuring that the sealing ring 41 can be in close contact with the surface of the valve core 3 in both the open and closed states, so as to avoid leakage of the medium in both the flowing and blocked states in these two states.

[0040] Leakage areas 34 are formed on the surface of the valve core 3 above and below the overlapping parts of two adjacent ridges 33. When the actuator 2 drives the valve core 3 to rotate in the valve body 1, when the ridges 33 are separated from the sealing ring 41, the leakage area 34 is connected to the medium channel inside the valve body 1; when the ridges 33 are in close contact with the sealing ring 41, the leakage area 34 and the medium channel inside the valve body 1 are closed.

[0041] It should be noted that, since the ridge 33 and the sealing ring 41 are tightly fitted together only when the ball valve is in the open and closed states, the sealing ring 41 will separate from the ridge 33 during the rotation of the valve core 3 in the valve body 1. During separation, the medium channel inside the valve body 1 will be connected to the leakage area 34, so the medium in the medium channel will flow from the medium channel into the leakage area 34. Moreover, since the sealing ring 41 is located between the medium channel and the leakage area 34, after the medium flows into the leakage area 34, the medium will remain on the surface of the sealing ring 41. When the medium is a fluid (such as oil), the fluid remains on the surface of the sealing ring 41. At this time, the fluid will act as a lubricant, reducing the friction between the ridge 33 and the sealing ring 41, thereby further improving the wear resistance of the valve core 3.

[0042] A valve stem 21 passes through the top of the valve body 1 , the top of the valve stem 21 is connected to the driving end of the driver 2 , a mounting groove 32 is provided on the surface of the valve core 3 , and the bottom end of the valve stem 21 is fitted and connected to the mounting groove 32 .

[0043] An inner chamber 5 is formed between the top and bottom of the valve core 3 and the interior of the valve body 1. The inner chamber 5 is in communication with the leakage area 34. A sealing plate 6 is mounted on the lower shaft 12 and the valve stem 21. When the internal pressure of the inner chamber 5 increases, the sealing plate 6 is driven along the axial direction of the lower shaft 12 or the valve stem 21 to approach the inner wall of the valve body 1.

[0044] It should be noted that the medium in the medium channel usually has a certain pressure, and the medium will rush into the inner chamber 5 from the medium channel (due to the pressure difference), which may cause the medium to leak from the top of the valve body 1;

[0045] The medium rushing into the inner chamber 5 pushes the sealing plate 6 upward to block the top of the inner chamber of the valve body 1, thereby preventing the medium from leaking from the top of the valve body 1.

[0046] An elastic bellows 9 is fixed on the axis of the valve stem 21, and the top of the elastic bellows 9 is fixedly connected to the bottom of the sealing plate 6. The elastic bellows 9 provides support for the sealing plate 6 and also seals the gap between the sealing plate 6 and the valve stem 21, further improving the anti-leakage performance of the sealing plate 6.

[0047] The top of the sealing plate 6 is provided with a plurality of staggered stepped holes 61. The outer peripheral side of the sealing plate 6 is provided with a plurality of channels 62 connected to the stepped holes 61. The channels 62 are spiral tracks, and the rotation direction of the plurality of channels 62 is the same. The top and bottom of the valve body 1 are penetrated by cleaning channels 7. The ends of the cleaning channels 7 located outside the valve body 1 are connected to the cleaner 8.

[0048] The inner wall of the valve body 1 is provided with a plurality of protrusions, and the plurality of protrusions correspond one to one with the plurality of stepped holes 61;

[0049] It is further explained that the medium entering the inner chamber 5 will contaminate the different media output by the subsequent ball valve after it remains for a long time, so the residual medium in the inner chamber 5 needs to be cleaned regularly; the washer 8 is externally connected to a cleaning source and a pressure source, and the cleaning water is pressed into the inner chamber 5 through the cleaning channel 7 by the pressure source and the cleaning source to clean the inner chamber 5; the high-pressure cleaning water flow is filled into the inner chamber 5 from the cleaning channel 7, and squeezes the side of the sealing plate 6 close to the inner wall of the valve body 1, driving the sealing plate 6 to move downward along the axis (taking the upper sealing plate 6 as an example, if the lower sealing plate 6 is taken as an example, the sealing plate 6 moves upward along the lower axis 12), and at the same time, the water flows into the stepped hole 61, and is guided by the inclined channel 62 to form a groove on the outer peripheral side of the sealing plate 6. A forward or reverse rotating water flow is sprayed towards the four sides of the inner chamber 5, thereby performing high-pressure flushing on the difficult-to-clean positions on the inner wall of the inner chamber 5 to improve the cleaning effect. On the other hand, the water flow sprayed in the same rotation direction will cause the sealing plate 6 to generate a rotational force, thereby realizing the sealing plate 6 to rotate and move downward, compressing and twisting the elastic bellows 9 (the sealing plate 6 is fixedly connected to the elastic bellows 9). When the inner chamber 5 is filled with cleaning water, the sealing plate 6 moves downward and rotates, which can oscillate the water in the chamber, further improving the cleaning effect; and the convex column and the stepped hole 61 are arranged in coordination with each other. In the aforementioned, the medium rushed into the inner chamber 5 pushes the sealing plate 6 to move upward, and the convex column and the stepped hole 61 are staggered and plugged in to block the top of the inner cavity of the valve body 1, further improving the sealing performance of the sealing plate 6.

[0050] In this embodiment, the implementation scenario is as follows: the ball valve is used to control the flow of the fluid, and the driver 2 controls the valve stem 21 to drive the valve core 3 to rotate to realize the opening and closing of the ball valve;

[0051] During the switching process between the open and closed states of the ball valve, the sealing ring 41 and the ridge 33 are separated, the medium channel is connected to the leakage area 34, and the medium flows into the leakage area 34, acting as a lubricant between the sealing ring 41 and the ridge 33, reducing the friction between the ridge 33 and the sealing ring 41, thereby improving the wear resistance of the valve core 3;

[0052] At the same time, the medium in the medium channel rushes into the inner chamber 5, increasing the pressure in the chamber and pushing the sealing plate 6 upward. The protruding columns and the stepped holes 61 are staggered and plugged into each other, blocking the top of the inner chamber of the valve body 1, thereby preventing the medium from leaking from the top of the valve body 1 and improving the sealing performance of the sealing plate 6.

[0053] When it is necessary to clean the inside of the valve body 1, the cleaner 8 is connected to an external cleaning source and a pressure source, and the cleaning water is pressed into the inner chamber 5 through the cleaning channel 7, and the sealing plate 6 is squeezed to drive the sealing plate 6 to move along the axis. At the same time, the water flows into the stepped hole 61, and is guided by the inclined channel 62 to form a forward or reverse rotating water flow on the outer peripheral side of the sealing plate 6 and sprayed to the surrounding areas of the inner chamber 5, thereby performing high-pressure flushing on the difficult-to-clean positions on the inner wall of the inner chamber 5 to improve the cleaning effect. On the other hand, the sprayed water flow in the same rotation direction will drive the sealing plate 6 to rotate, oscillating the water in the chamber, further improving the cleaning effect.

[0054] A method for spraying a tungsten carbide and DLC composite coating comprises the following steps: S1, cleaning the surface of a valve core 3;

[0055] S2, tungsten carbide is injected into the ridge 33 on the surface of the valve core 3 by ion implantation, so that a transition layer of tungsten carbide and steel is formed on the surface of the ridge 33;

[0056] S3, spraying primer on the surface of the ridge 33 and drying the primer;

[0057] S4, spraying a composite coating of tungsten carbide and DLC on the surface of the ridge 33 along the spraying track of the spray primer, and drying the coating.

[0058] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wear-resistant ball valve, comprising two detachably connected valve bodies (1), characterized in that: A valve core (3) is provided inside the valve body (1), and a through hole (31) in the same direction as the valve body (1) is passed through the valve core (3). A valve seat (4) is installed inside the two valve bodies (1), and the valve seat (4) is sleeved outside the valve core (3). A base (11) is installed at the bottom of one of the valve bodies (1), and a lower shaft (12) is installed at the end of the base (11) located inside the valve body (1). The lower shaft (12) is inserted into the valve core (3), and the extended axis of the lower shaft (12) coincides with the spherical center of the valve core (3). A driver (2) is installed on the top of one of the valve bodies (1), and the driver (2) drives the valve core (3) to rotate in the valve body (1) to realize the opening and closing of the ball valve; A sealing ring (41) is embedded in the valve seat (4), and an annular ridge (33) is integrally formed on the spherical surface of the valve core (3). The ridge (33) is adapted to the sealing ring (41), and when the ball valve is in the open and closed states, the ridge (33) close to the valve seat (4) is always in close contact with the sealing ring (41), thereby achieving sealing of the valve core (3) in the valve body (1). The surface of the ridge (33) is sprayed with a composite coating of tungsten carbide and DLC; A valve stem (21) passes through the top of the valve body (1), and the top end of the valve stem (21) is connected to the driving end of the driver (2); An inner chamber (5) is formed between the top and bottom of the valve core (3) and the interior of the valve body (1), and a sealing plate (6) is mounted on the shaft of the lower shaft (12) and the valve stem (21). When the internal pressure of the inner chamber (5) increases, the sealing plate (6) is driven to approach the inner wall of the valve body (1) along the axial direction of the lower shaft (12) or the valve stem (21); An elastic bellows (9) is fixedly sleeved on the shaft of the valve stem (21), and the top of the elastic bellows (9) is fixedly connected to the bottom of the sealing plate (6); The top of the sealing plate (6) is provided with a plurality of staggered stepped holes (61), and the outer peripheral side of the sealing plate (6) is provided with a plurality of channels (62) connected to the stepped holes (61). The channels (62) are spiral tracks, and the rotation direction of the plurality of channels (62) is the same. The top and bottom of the valve body (1) are penetrated by a cleaning channel (7), and the end of the cleaning channel (7) located outside the valve body (1) is connected to a cleaner (8).

2. The wear-resistant ball valve according to claim 1, characterized in that: The convex ribs (33) are provided with four ribs distributed around the axis of the lower shaft (12), and two of the ribs (33) facing each other are coaxially arranged with the through hole (31), and the center line connecting the other two ribs (33) facing each other is perpendicular to the axis of the through hole (31).

3. The wear-resistant ball valve according to claim 2, characterized in that: A leakage area (34) is formed on the surface of the valve core (3) above and below the overlapping part of two adjacent ridges (33). When the driver (2) drives the valve core (3) to rotate in the valve body (1), when the ridge (33) is separated from the sealing ring (41), the leakage area (34) is connected to the internal medium channel of the valve body (1); when the ridge (33) is in close contact with the sealing ring (41), the leakage area (34) and the internal medium channel of the valve body (1) are closed.

4. The wear-resistant ball valve according to claim 3, characterized in that: A mounting groove (32) is provided on the surface of the valve core (3), and the bottom end of the valve stem (21) is cooperatively connected to the mounting groove (32).

5. The wear-resistant ball valve according to claim 4, characterized in that: The inner chamber (5) is in communication with the material leakage area (34).

6. The wear-resistant ball valve according to claim 5, characterized in that: The inner wall of the valve body (1) is provided with a plurality of protruding columns, and the plurality of protruding columns correspond one to one with the plurality of stepped holes (61).

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