Sealing structure of wear-resistant ball valve

Abstract

The invention provides a sealing structure of a wear-resistant ball valve, and relates to the technical field of ball valves, the sealing structure comprises a ball valve body, a valve ball and a handle, the valve ball is rotatably mounted in the ball valve body, the valve ball can seal the ball valve body, and one end of the handle penetrates through the ball valve body and is fixedly connected with the valve ball; two sealing grooves are formed in the inner wall of the ball valve body and located in the two sides of the valve ball correspondingly, metal sealing rings are installed in the sealing grooves, and a constant-force abutting mechanism is installed on the ball valve body and used for driving the metal sealing rings to abut against the valve ball with constant acting force. According to the sealing structure of the wear-resistant ball valve, through the arrangement of the ball valve body, the valve ball, the handle, the metal sealing ring and the constant-force abutting mechanism, after the valve ball and the metal sealing ring are used for a long time and are abraded, it can be guaranteed that the metal sealing ring abuts against the valve ball with the constant acting force, and the sealing performance of the ball valve is guaranteed; and the influence on the sealing effect of the ball valve due to abrasion is reduced.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and more particularly to a sealing structure for a wear-resistant ball valve. Background Technology

[0002] In industrial fields such as mining, metallurgy, chemical industry, and powder conveying, the media often contain a large number of hard particles, and the conveying conditions are mostly high pressure and high flow rate, which places extremely high demands on the wear resistance and sealing performance of valves used for pipeline opening and closing. Wear-resistant ball valves, with their flexible opening and closing of the ball, unobstructed flow path, and excellent wear resistance, have become the core control component of pipeline systems in these fields. To adapt to harsh wear-resistant conditions, existing wear-resistant ball valves mostly adopt a metal sealing structure. Among them, a common one is to set a disc spring driven bimetallic sealing ring structure at the ball valve seat. That is, metal sealing rings are installed on both sides of the ball valve body cavity. The side of the sealing ring away from the valve ball abuts against the disc spring assembly. The pre-tightening rebound force of the disc spring drives the two metal sealing rings to tightly abut against the sealing surfaces on both sides of the valve ball, thereby achieving bidirectional sealing during the opening and closing process of the ball valve. Due to the wear resistance of the metal sealing rings, the service life of the ball valve is improved to a certain extent. However, in actual long-term operation, the metal sealing structure driven by disc springs gradually reveals the problem of reduced sealing reliability. During long-term friction with the valve ball, the metal sealing ring will wear down. The increased compression distance of the disc spring leads to a decrease in the force exerted by the disc spring on the metal sealing ring. The tight fit of the sealing surface, which originally relied on the rebound force of the disc spring, cannot be effectively compensated for due to the decrease in the force of the disc spring. This results in a gap between the sealing ring and the sealing surface of the valve ball, which not only reduces the sealing performance of the ball valve and causes media leakage, but may also cause the leaked media to flush the valve body cavity, further shortening the overall service life of the wear-resistant ball valve. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention proposes a sealing structure for a wear-resistant ball valve.

[0004] The present invention proposes a sealing structure for a wear-resistant ball valve, comprising a ball valve body, a ball, and a handle. The ball is rotatably mounted in the ball valve body and can seal the ball valve body. One end of the handle passes through the ball valve body and is fixedly connected to the ball. The inner wall of the ball valve body has two sealing grooves, which are located on both sides of the valve ball. Metal sealing rings are installed in the sealing grooves. A constant force clamping mechanism is installed on the ball valve body. The constant force clamping mechanism is used to drive the metal sealing rings against the valve ball with a constant force.

[0005] Preferably, the constant force clamping mechanism includes multiple constant force springs; the ball valve body has multiple drive slots arranged in a ring array, and the multiple constant force springs are respectively installed in the multiple drive slots. The inner ring end of the constant force spring is fixed in the drive slot, and the outer ring end of the constant force spring is connected to the side of the metal sealing ring away from the valve ball.

[0006] Preferably, the constant force clamping mechanism further includes a limiting protective block; the inner wall of the sealing groove is provided with a protective hole that slides with the limiting protective block, and the two ends of the limiting protective block are respectively fixedly connected to the side of the metal sealing ring away from the valve ball and the outer ring end of the constant force spring.

[0007] Preferably, the ball valve body is also equipped with an adjustment mechanism, which is used to adjust the sliding friction of the metal sealing ring in the sealing groove.

[0008] Preferably, the adjusting mechanism includes a clamping block, an adjusting cap, a driving assembly, and a positioning assembly; the ball valve body has multiple adjusting slots arranged in a ring array, the number of clamping blocks is the same as the number of adjusting slots and they are set one-to-one, the clamping blocks are slidably installed in the adjusting slots, and one end of the clamping block abuts against the outer periphery of the metal sealing ring; The adjusting cap is rotated and mounted on the ball valve body. The drive assembly is used to convert the rotation of the adjusting cap into the movement of the pressing block pressing against the outer circumference of the metal sealing ring. The positioning component is used to fix the position of the adjusting cap on the ball valve body.

[0009] Preferably, the drive assembly includes a ramp block and a drive ramp block; the ramp block is fixedly connected to the end of the abutment block away from the metal sealing ring, and the drive ramp block is connected to the inner wall of the adjusting cap, with the ramp of the drive ramp block slidingly engaging with the ramp of the ramp block.

[0010] Preferably, the drive assembly further includes a return spring; a limiting groove is provided in the ball valve body to slide with the inclined block, the return spring is located in the limiting groove, and the two ends of the return spring abut against the inner wall of the end of the limiting groove and the inclined block, respectively.

[0011] Preferably, the positioning assembly includes a positioning tooth block, a pressing rod, and a rebound component; a positioning groove is provided in the body of the ball valve, the positioning tooth block is slidably installed in the positioning groove, the inner wall of the positioning groove is provided with a tooth groove that meshes with the positioning tooth block, and one end of the pressing rod passes through the adjusting cap and extends into the positioning groove to be fixedly connected to the positioning tooth block;

[0012] The rebound component is used to drive the positioning tooth block into the tooth groove.

[0013] Preferably, the rebound component includes a sliding box and an ejector; the sliding box is slidably disposed in the positioning groove, and the sliding box has a storage groove that can accommodate the positioning tooth block; The ejector is located inside the receiving slot, and the ejector can cause the positioning tooth block to tend to move out of the receiving slot.

[0014] Preferably, the ejector includes a positioning spring; the positioning spring is located in the receiving groove, and its two ends abut against the positioning tooth block and the inner wall of the end of the receiving groove, respectively.

[0015] The sealing structure of the wear-resistant ball valve proposed in this invention has the following beneficial effects: by setting the ball valve body, ball, handle, metal sealing ring and constant force pressing mechanism, even after the ball and metal sealing ring are worn after long-term use, the metal sealing ring can still be ensured to press against the ball with a constant force, ensuring the sealing performance of the ball valve and reducing the impact of wear on the sealing effect of the ball valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the sealing structure of a wear-resistant ball valve proposed in this invention; Figure 2 This is a cross-sectional view of the sealing structure of a wear-resistant ball valve proposed in this invention; Figure 3 The present invention proposes a sealing structure for a wear-resistant ball valve. Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the end face of the driving inclined block at the position inside the ball valve body in the sealing structure of the wear-resistant ball valve proposed in this invention. Figure 5 This is a cross-sectional view of the end face of the positioning component in the valve body of a wear-resistant ball valve according to the present invention. Figure 6 The present invention proposes a sealing structure for a wear-resistant ball valve. Figure 5 Enlarged view at point B in the middle; Figure 7 This is a schematic diagram of the pressing rod and positioning tooth block in the sealing structure of a wear-resistant ball valve proposed in this invention.

[0017] In the diagram: 1. Ball valve body; 2. Valve ball; 3. Handle; 4. Metal sealing ring; 5. Constant force spring; 6. Limiting protection block; 7. Pressing block; 8. Adjusting cap; 9. Inclined block; 10. Drive inclined block; 11. Return spring; 12. Positioning tooth block; 13. Pressing rod; 14. Slide box; 15. Positioning spring. Detailed Implementation

[0018] Reference Figures 1-7This invention proposes a sealing structure for a wear-resistant ball valve, comprising a ball valve body 1, a ball 2, and a handle 3. The ball 2 is rotatably installed inside the ball valve body 1 and can seal the ball valve body 1. One end of the handle 3 penetrates the ball valve body 1 and is fixedly connected to the ball 2. A through hole is provided on the ball 2. By rotating the handle 3, the ball 2 is driven to rotate synchronously, thereby controlling the connection or blockage within the ball valve body 1. Two sealing grooves are provided on the inner wall of the ball valve body 1, located on both sides of the ball 2. A metal sealing ring 4 is installed in the sealing groove. A constant force clamping mechanism is installed on the ball valve body 1. The constant force clamping mechanism is used to drive the metal sealing ring 4 against the ball 2 with a constant force. In actual use, the rotation of the ball 2 will cause wear between it and the metal sealing ring 4. To ensure the sealing performance between the metal sealing ring 4 and the ball 2, it is necessary to ensure the tightness between the metal sealing ring 4 and the ball 2. In addition, it is also necessary to ensure the clamping force between the metal sealing ring 4 and the valve ball 2. If the clamping force is too large, it will affect the rotation of the valve ball 2 and increase wear. If the clamping force is too small, it will affect its sealing performance. Therefore, a constant force clamping mechanism is set to drive the metal sealing ring 4 against the valve ball 2 with a constant force, thereby ensuring the sealing performance and ensuring the smooth rotation of the valve ball 2, reducing the occurrence of jamming. An adjustment mechanism is also installed on the ball valve body 1. The adjustment mechanism is used to adjust the sliding friction force of the metal sealing ring 4 in the sealing groove. In some special cases, it is necessary to adjust the clamping force between the metal sealing ring 4 and the valve ball 2. For example, under high pressure conditions, the medium pressure will try to push the sealing ring open. Sufficient clamping force is needed to counteract the medium pressure and ensure stable sealing. By adjusting the sliding friction force of the metal sealing ring 4 in the ball valve body 1 through the adjustment mechanism, the magnitude of the force of the metal sealing ring 4 against the valve ball 2 can be adjusted according to actual needs.

[0019] like Figure 2 and Figure 3 As shown, the constant force pressing mechanism includes multiple constant force springs 5; the ball valve body 1 has multiple drive slots arranged in a ring array, and the multiple constant force springs 5 ​​are respectively installed in the multiple drive slots. The inner ring end of the constant force spring 5 is fixed in the drive slot, and the outer ring end of the constant force spring 5 is connected to the side of the metal sealing ring 4 away from the valve ball 2. According to the characteristics of the constant force spring 5, a constant force can be applied evenly to the metal sealing ring 4, so that the metal sealing ring 4 can abut against the valve ball 2 with a constant force regardless of whether it is before or after wear, thereby ensuring the smoothness and sealing of the valve ball 2 rotation.

[0020] like Figure 2 and Figure 3As shown, the constant force clamping mechanism also includes a limiting protective block 6; the inner wall of the sealing groove is provided with a protective hole that slides with the limiting protective block 6. The two ends of the limiting protective block 6 are fixedly connected to the side of the metal sealing ring 4 away from the valve ball 2 and the outer ring end of the constant force spring 5, respectively. In actual practice, the limiting protective block 6 can block the protective hole, so that the sealing groove is in a relatively closed space, so that the constant force spring 5 will not come into contact with the external medium, thereby reducing the corrosion of the constant force spring 5 and ensuring the service life of the constant force spring 5 and the constant force on the metal sealing ring 4.

[0021] like Figure 2 , Figure 3 and Figure 4 As shown, the adjusting mechanism includes a clamping block 7, an adjusting cap 8, a driving assembly, and a positioning assembly. Multiple adjusting slots arranged in a circular array are provided inside the ball valve body 1. The number of clamping blocks 7 is the same as the number of adjusting slots and they are arranged in a one-to-one correspondence. The clamping blocks 7 are slidably installed in the adjusting slots, with one end of each clamping block 7 abutting against the outer periphery of the metal sealing ring 4. The adjusting cap 8 is rotatably fitted onto the ball valve body 1. The driving assembly converts the rotation of the adjusting cap 8 into the movement of the clamping blocks 7 pressing against the outer periphery of the metal sealing ring 4. The positioning assembly fixes the position of the adjusting cap 8 on the ball valve body 1. When adjusting the sliding friction of the metal sealing ring 4, rotate the adjusting cap 8. The drive component converts the rotation of the adjusting cap 8 into the movement of the pressing block 7 pressing against the outer circumference of the metal sealing ring 4, increasing the force of the pressing block 7 against the outer circumference of the metal sealing ring 4. Multiple pressing blocks 7 are pressed against the outer circumference of the metal sealing ring 4, so that the outer circumference of the metal sealing ring 4 is evenly stressed, ensuring that the magnitude of the sliding friction of the metal sealing ring 4 is adjusted. The operation is simple and convenient. In addition, the position of the adjusting cap 8 is fixed by the positioning component to prevent the adjusting cap 8 from rotating and causing a change in the sliding friction of the metal sealing ring 4.

[0022] like Figure 2 , Figure 3 and Figure 4 As shown, the drive assembly includes a ramp block 9 and a drive ramp block 10. The ramp block 9 is fixedly connected to the end of the abutment block 7 away from the metal sealing ring 4. The drive ramp block 10 is connected to the inner wall of the adjusting cap 8. The ramp surface of the drive ramp block 10 slides with the ramp surface of the ramp block 9. When adjusting the sliding friction of the metal sealing ring 4, the adjusting cap 8 is rotated, and the adjusting cap 8 drives multiple drive ramp blocks 10 to rotate synchronously. When the drive ramp block 10 rotates, the ramp surfaces of the drive ramp block 10 and the ramp block 9 slide together, driving the ramp block 9 to slide inside the ball valve body 1. The ramp block 9 drives the abutment block 7 to slide synchronously and press against the outer periphery of the metal sealing ring 4.

[0023] like Figure 3 and Figure 4As shown, the drive assembly also includes a return spring 11; a limiting groove is provided in the ball valve body 1 to slide with the inclined block 9, the return spring 11 is located in the limiting groove, and the two ends of the return spring 11 abut against the inner wall of the end of the limiting groove and the inclined block 9, respectively. When reducing the sliding friction of the metal sealing ring 4, by rotating the adjusting cap 8, the inclined block 9 and the pressing block 7 are driven away from the metal sealing ring 4 under the rebound action of the return spring 11, thereby reducing the force between the pressing block 7 and the metal sealing ring 4 and reducing the sliding friction of the metal sealing ring 4. The operation is simple and convenient.

[0024] like Figure 3 , Figure 5 and Figure 6 As shown, the positioning assembly includes a positioning tooth block 12, a pressing rod 13, and a rebound component. A positioning groove is provided inside the ball valve body 1. The positioning tooth block 12 is slidably installed in the positioning groove. The inner wall of the positioning groove is provided with a tooth groove that meshes with the positioning tooth block 12. One end of the pressing rod 13 passes through the adjusting cap 8 and extends into the positioning groove to be fixedly connected to the positioning tooth block 12. The rebound component is used to drive the positioning tooth block 12 into the tooth groove. In actual operation, the adjusting cap 8 is rotated, and the pressing rod 13 is pressed down first, so that the pressing rod 13 drives the positioning tooth block 12 to disengage from the tooth groove. Then, the adjusting cap 8 is rotated to drive the positioning tooth block 12 to slide in the positioning groove. After reaching the designated position, the pressing rod 13 is released. Under the driving action of the rebound component, the positioning tooth block 12 is driven into the tooth groove at the corresponding position, thereby restricting the sliding of the positioning tooth block 12 in the positioning groove and fixing the position of the adjusting cap 8.

[0025] like Figure 5 and Figure 6 As shown, the rebound component includes a sliding box 14 and an ejector. The sliding box 14 is slidably disposed in the positioning groove. The sliding box 14 has a receiving groove that can accommodate the positioning tooth block 12. The ejector is located in the receiving groove and can make the positioning tooth block 12 tend to move out of the receiving groove. The ejector includes a positioning spring 15. The positioning spring 15 is located in the receiving groove. The two ends of the positioning spring 15 abut against the inner wall of the end of the positioning tooth block 12 and the receiving groove, respectively. When the adjusting cap 8 is rotated, the pressing rod 13, the positioning tooth block 12 and the sliding box 14 will slide synchronously to ensure that the ejector can move with the displacement of the positioning tooth block 12. Then, the rebound action of the positioning spring 15 drives the positioning tooth block 12 to be inserted into the tooth groove at the corresponding position, thus completing the fixation of the position of the positioning tooth block 12 and the adjusting cap 8.

[0026] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sealing structure for a wear-resistant ball valve, characterized in that, The valve includes a ball valve body (1), a ball valve (2) and a handle (3). The ball valve (2) is rotatably installed inside the ball valve body (1) and can block the ball valve body (1). One end of the handle (3) passes through the ball valve body (1) and is fixedly connected to the ball valve (2). The inner wall of the ball valve body (1) has two sealing grooves, which are located on both sides of the ball (2). A metal sealing ring (4) is installed in the sealing groove. A constant force pressing mechanism is installed on the ball valve body (1). The constant force pressing mechanism is used to drive the metal sealing ring (4) against the ball (2) with a constant force.

2. The sealing structure of a wear-resistant ball valve according to claim 1, characterized in that, The constant force clamping mechanism includes multiple constant force springs (5); the ball valve body (1) has multiple drive slots arranged in a ring array, and the multiple constant force springs (5) are respectively installed in the multiple drive slots. The inner ring end of the constant force spring (5) is fixed in the drive slot, and the outer ring end of the constant force spring (5) is connected to the side of the metal sealing ring (4) away from the valve ball (2).

3. The sealing structure of a wear-resistant ball valve according to claim 2, characterized in that, The constant force clamping mechanism also includes a limiting protective block (6); the inner wall of the sealing groove is provided with a protective hole that slides with the limiting protective block (6), and the two ends of the limiting protective block (6) are respectively fixedly connected to the side of the metal sealing ring (4) away from the valve ball (2) and the outer ring end of the constant force spring (5).

4. The sealing structure of a wear-resistant ball valve according to claim 1, characterized in that, An adjustment mechanism is also installed on the ball valve body (1), which is used to adjust the sliding friction of the metal sealing ring (4) in the sealing groove.

5. The sealing structure of a wear-resistant ball valve according to claim 4, characterized in that, The adjustment mechanism includes a clamping block (7), an adjustment cap (8), a drive assembly, and a positioning assembly; the ball valve body (1) has multiple adjustment slots arranged in a ring array, the number of clamping blocks (7) is the same as the number of adjustment slots and they are set one by one, the clamping blocks (7) are slidably installed in the adjustment slots, and one end of the clamping block (7) abuts against the outer periphery of the metal sealing ring (4); The adjusting cap (8) is rotatably mounted on the ball valve body (1), and the driving assembly is used to convert the rotation of the adjusting cap (8) into the movement of the pressing block (7) pressing against the outer periphery of the metal sealing ring (4); The positioning component is used to fix the position of the adjusting cap (8) on the ball valve body (1).

6. The sealing structure of a wear-resistant ball valve according to claim 5, characterized in that, The drive assembly includes a ramp block (9) and a drive ramp block (10); the ramp block (9) is fixedly connected to the end of the abutment block (7) away from the metal sealing ring (4), and the drive ramp block (10) is connected to the inner wall of the adjusting cap (8). The ramp of the drive ramp block (10) and the ramp of the ramp block (9) slide together.

7. The sealing structure of a wear-resistant ball valve according to claim 6, characterized in that, The drive assembly also includes a reset spring (11); the ball valve body (1) has a limiting groove that slides with the inclined block (9), the reset spring (11) is located in the limiting groove, and the two ends of the reset spring (11) abut against the inner wall of the end of the limiting groove and the inclined block (9) respectively.

8. The sealing structure of a wear-resistant ball valve according to claim 5, characterized in that, The positioning assembly includes a positioning tooth block (12), a pressing rod (13), and a rebound component; a positioning groove is provided inside the ball valve body (1), the positioning tooth block (12) is slidably installed in the positioning groove, the inner wall of the positioning groove is provided with a tooth groove that meshes with the positioning tooth block (12), and one end of the pressing rod (13) passes through the adjusting cap (8) and extends into the positioning groove to be fixedly connected to the positioning tooth block (12); The rebound component is used to drive the positioning tooth block (12) into the tooth groove.

9. The sealing structure of a wear-resistant ball valve according to claim 8, characterized in that, The rebound component includes a sliding box (14) and an ejector; the sliding box (14) is slidably disposed in the positioning groove, and the sliding box (14) has a storage groove that can accommodate the positioning tooth block (12); The ejector is located inside the receiving groove, and the ejector can cause the positioning tooth block (12) to have a tendency to move out of the receiving groove.

10. The sealing structure of a wear-resistant ball valve according to claim 9, characterized in that, The ejector includes a positioning spring (15); the positioning spring (15) is located in the receiving groove, and the two ends of the positioning spring (15) abut against the positioning tooth block (12) and the inner wall of the end of the receiving groove, respectively.

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