A two-step opening and closing gate valve

Abstract

The application relates to the technical field of gate valves, and provides a two-step opening and closing gate valve which comprises a valve body and a gate plate, a flow channel and a mounting sliding groove are respectively arranged in the valve body, one end of the mounting sliding groove is communicated with the flow channel, and a mounting seat is slidably arranged in the mounting sliding groove; a valve rod is threadedly connected to the valve body, one end of the valve rod penetrates into the mounting sliding groove and is rotationally connected with the mounting seat; the gate plate is arranged in the flow channel, the gate plate is connected with a rotating column, the rotating column is rotationally connected with the mounting seat, and the mounting seat is provided with a driving assembly used for driving the gate plate to rotate. The two-step opening and closing gate valve can improve the opening and closing convenience of the gate valve.

Description

Technical Field

[0001] This application relates to the technical field of gate valves, and in particular to a two-step opening and closing gate valve. Background Technology

[0002] Gate valves are a common type of shut-off valve, primarily controlling the flow of media by raising and lowering a gate. They are suitable for pipeline systems carrying various media such as water, steam, and oil, and are widely used in industrial and civil applications.

[0003] In existing technologies, gate valves typically consist of a valve body, valve cover, gate, valve stem, and drive mechanism. During opening and closing, a handle or other tool is used to apply torque to the valve stem to control the raising and lowering of the gate, thus opening and closing the valve. However, in practical applications, in scenarios involving pressurized media, the gate valve experiences significant resistance to movement due to the pressure of the medium, making opening and closing difficult and increasing the workload of operators. Therefore, further improvements are needed. Summary of the Invention

[0004] To improve the ease of opening and closing of gate valves, this application provides a two-step gate valve.

[0005] The two-step opening and closing gate valve provided in this application adopts the following technical solution:

[0006] A two-step gate valve includes a valve body and a gate. The valve body has a flow channel and a mounting groove. One end of the mounting groove is connected to the flow channel, and a mounting seat is slidably installed in the mounting groove. A valve stem is threaded onto the valve body, and one end of the valve stem passes through the mounting groove and is rotatably connected to the mounting seat. The gate is disposed in the flow channel and is connected to a rotating column. The rotating column is rotatably connected to the mounting seat, and the mounting seat is provided with a drive assembly for driving the gate to rotate.

[0007] By adopting the above technical solution, when the valve body is opened, the drive assembly rotates the gate by a certain angle to open the flow channel and relieve pressure. Then, the valve stem drives the mounting seat to slide away from the flow channel, moving the gate into the mounting groove, thereby fully opening the flow channel for the medium to pass through. When closed, the mounting seat is driven to slide closer to the flow channel, forcing the gate into the flow channel. Then, the gate is driven to rotate by a certain angle, thereby fully closing the flow channel. The rotation of the gate reduces the workload of the operator during opening and closing, and improves the ease of opening and closing the gate valve under high-pressure media.

[0008] Optionally, the mounting base includes a first mounting part and a second mounting part, the valve stem is rotatably connected to the first mounting part, and the rotating column is rotatably connected to the second mounting part; the drive assembly includes a drive sleeve and a drive column, the drive sleeve is disposed in the first mounting part, and one end of the rotating column extends into the drive sleeve; the drive column is disposed on the inner peripheral wall of the drive sleeve, and the outer peripheral wall of the rotating column is provided with a guide groove for the drive column to be embedded; when the first mounting part drives the gate to move into the flow channel and continues to drive the first mounting part to slide towards the side closer to the flow channel, the drive column forces the gate to rotate through the guide groove to close the flow channel.

[0009] By adopting the above technical solution, when the gate is closed, the valve stem drives the first mounting part to slide closer to the flow channel, causing the gate to move into the flow channel. After the gate moves into the flow channel, the valve stem is rotated continuously. At this time, the second mounting part can no longer move, and under the action of the drive column of the drive sleeve, the rotating column rotates a certain angle, forcing the gate to completely close the flow channel, thus improving the operational convenience of the overall structure.

[0010] Optionally, the two ends of the guide groove form a first point and a second point, respectively. The first point and the second point are offset along the circumference of the rotating column, and the second point is located on the side of the first point closer to the flow channel. When the gate moves into the mounting groove, the driving column is located at the first point. When the gate moves into the flow channel and forces the driving column to move into the second point, the gate closes the flow channel.

[0011] By adopting the above technical solution, when the gate is located in the mounting groove, the drive column is at the first position. The effect achieved is that when the first mounting part is slid towards the flow channel in this state, the gate cannot rotate. This allows the first mounting part to drive the second mounting part to slide, bringing the gate into the flow channel. Once the gate is in the flow channel, continuing to drive the first mounting part towards the flow channel moves the drive column from the first position to the second position, thereby rotating the gate to completely close the flow channel and improving the overall operational convenience of the structure.

[0012] Optionally, the second mounting part is adapted to the cross-sectional shape of the mounting groove, and when the gate moves into the flow channel, the second mounting part blocks the groove of the mounting groove near the flow channel.

[0013] By adopting the above technical solution, the second mounting part is used to seal the groove opening of the mounting slide near the flow channel, thereby improving the overall sealing performance.

[0014] Optionally, the mounting base includes a first mounting portion and a second mounting portion, the valve stem is rotatably connected to the first mounting portion, and the rotating column is rotatably connected to the second mounting portion; the drive assembly includes a first drive bar, a second drive bar, a connecting rod, and a drive member, one end of the first drive bar is connected to the outer peripheral wall of the rotating column, and the second drive bar is slidably mounted on the second mounting portion; one end of the connecting rod is hinged to the first drive bar, and the other end is hinged to the second drive bar; the drive member is disposed in the first mounting portion to drive the second drive bar to slide.

[0015] By adopting the above technical solution, when the gate is closed, the valve stem drives the first mounting part to slide closer to the flow channel, causing the gate to move into the flow channel. After the gate moves into the flow channel, the valve stem is rotated further. At this time, the second mounting part cannot move further. The driving component forces the second driving bar to slide, and under the action of the connecting rod, it pushes the first driving bar of the rotating column, thereby causing the rotating column to rotate at a certain angle, so as to force the gate to completely close the flow channel, improving the operational convenience of the overall structure.

[0016] Optionally, the driving component includes a driving rod, one end of which is connected to the first mounting portion. The driving rod gradually moves away from the rotating column from the end near the first mounting portion to the end away from the first mounting portion. The second driving bar has a pushing groove through which the driving rod passes. When the gate moves into the flow channel and continues to drive the first mounting portion to slide towards the side near the flow channel, the driving rod forces the rotating column to rotate so that the gate closes the flow channel.

[0017] By adopting the above technical solution, when the gate is located in the mounting groove, it cannot rotate. Therefore, when the first mounting part is driven to slide towards the side closer to the flow channel, the drive rod cannot push the second drive bar to slide, thus allowing the first mounting part to drive the second mounting part to slide towards the side closer to the flow channel. After the first mounting part drives the gate into the flow channel, the gate (i.e., the second mounting part) cannot continue to slide in this state. Continuing to drive the first mounting part to slide towards the side closer to the flow channel allows the drive rod to drive the second drive bar to slide, forcing the gate to rotate around the rotating column by a certain angle to completely close the flow channel, thus improving the overall operational convenience of the structure.

[0018] Optionally, the drive rod includes a vertical section and an inclined section. One end of the vertical section is connected to the first mounting part, and the other end of the vertical section is connected to the inclined section. The inclined section gradually moves away from the rotating column from the end closer to the first mounting part to the end farther away from the first mounting part. A limit rod is slidably mounted on the second mounting part, and a first spring is provided between the limit rod and the second mounting part. When the gate closes the flow channel and continues to drive the first mounting part to slide towards the side closer to the flow channel, the inclined section pushes the limit rod and forces the limit rod to abut against the surface of the gate near the outlet end of the flow channel.

[0019] By adopting the above technical solution, after the valve stem forces the gate to completely close the flow channel, the valve stem is rotated to force the first mounting part to continue sliding towards the side closer to the flow channel. At this time, the inclined section can push the limit rod, forcing the limit rod to abut against the surface of the gate near the outlet end of the flow channel, thereby forming a support effect on the gate, reducing the rotational burden on the rotating column, and reducing the possibility of the gate rotating due to the pressure of the medium.

[0020] Optionally, the side wall of the gate is provided with a sealing ring groove, and a sealing ring is embedded in the sealing ring groove; the gate is provided with an expansion component, which is used to force the sealing ring to press against the inner wall of the flow channel.

[0021] By adopting the above technical solution, after the gate completely closes the flow channel, the expansion component forces the sealing ring to press against the inner wall of the flow channel, thereby improving the overall sealing performance.

[0022] Optionally, the expansion assembly includes an expansion airbag and an inflator. The expansion airbag is embedded in a sealing ring groove, and the sealing ring is disposed on the outside of the expansion airbag. The inflator is disposed in a gate to force the expansion airbag to expand.

[0023] By adopting the above technical solution, after the gate completely closes the flow channel, the inflation component forces the expansion bladder to expand, thereby squeezing the sealing ring and making the sealing ring more tightly pressed against the inner wall of the flow channel, thus improving the overall sealing performance.

[0024] Optionally, the gate has an inflation chamber, and the inflation bladder is connected to an inflation tube, one end of which is connected to the inflation chamber. The inflation component includes a compression head and a second spring. The compression head is slidably installed in the inflation chamber and is connected to a compression rod. One end of the compression rod passes through the end face of the rotating column near the first mounting part. The second spring is disposed between the compression head and the inner wall of the inflation chamber. When the gate closes the flow channel and continues to drive the first mounting part to slide towards the side closer to the flow channel, the first mounting part pushes the compression head and squeezes the air in the inflation chamber into the inflation bladder.

[0025] By employing the above technical solution, rotating the valve stem forces the gate to move into the flow channel. Continuing to rotate the valve stem causes the gate to rotate at a certain angle, completely closing the flow channel. Then, continuing to rotate the valve stem causes the first mounting part to slide further towards the side closest to the flow channel, pushing the extrusion head and forcing air from the inflation chamber into the expansion bladder, thus inflating the expansion bladder and improving the overall sealing performance.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By configuring the drive assembly, when the valve body is open, the drive assembly rotates the gate by a certain angle to open the flow channel and relieve pressure. Then, the valve stem drives the mounting seat to slide away from the flow channel, moving the gate into the mounting groove, thus fully opening the flow channel for the medium to pass through. When closing, the drive assembly moves the mounting seat towards the flow channel, forcing the gate into the flow channel. Then, the drive assembly rotates the gate by a certain angle, thus fully closing the flow channel. Utilizing the rotation of the gate reduces the operator's workload during opening and closing, and improves the ease of opening and closing the gate valve under high-pressure media.

[0028] 2. By setting the limit rod, after the valve stem forces the gate to completely close the flow channel, the valve stem is rotated to force the first mounting part to continue sliding towards the side closer to the flow channel. At this time, the inclined section can push the limit rod, forcing the limit rod to abut against the surface of the gate near the outlet end of the flow channel, thereby forming a support effect on the gate, reducing the rotational burden of the rotating column, and reducing the possibility of the gate rotating due to the pressure of the medium.

[0029] 3. By rotating the valve stem through the expansion assembly, the gate is forced into the flow channel. Continuing to rotate the valve stem causes the gate to rotate at a certain angle, completely closing the flow channel. Then, continuing to rotate the valve stem causes the first mounting part to slide further towards the flow channel, pushing the extrusion head and forcing air from the inflation chamber into the expansion bladder, thus inflating the bladder and improving the overall sealing performance. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the overall structure of Embodiment 1;

[0031] Figure 2 This is a partial cross-sectional view of the driving component in Embodiment 1;

[0032] Figure 3 This is a partial cross-sectional view of Embodiment 1 illustrating the gate flipping and depressurization.

[0033] Figure 4 This is a partial cross-sectional view of Embodiment 1 illustrating a fully closed flow channel of the gate;

[0034] Figure 5 This is a partial cross-sectional view of the driving component in Embodiment 2;

[0035] Figure 6 This is a partial cross-sectional view of the first drive bar in Embodiment 2;

[0036] Figure 7 This is a partial cross-sectional view of Embodiment 3 showing the limiting rod;

[0037] Figure 8 This is a partial cross-sectional view of the expansion component in Embodiment 3.

[0038] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Flow channel; 12. Mounting groove; 13. Valve stem; 131. Handwheel; 14. Valve cover; 15. Limiting strip; 2. Gate; 21. Rotating column; 211. Guide groove; 212. First position; 213. Second position; 22. Sealing ring groove; 23. Sealing ring; 24. Inflation chamber; 3. Mounting seat; 31. First mounting part; 32. Second mounting part; 33. Limiting strip. Positioning rod; 331, First spring; 4, Drive assembly; 41, Drive sleeve; 42, Drive column; 43, First drive bar; 44, Second drive bar; 441, Push groove; 45, Connecting rod; 46, Drive rod; 461, Vertical section; 462, Inclined section; 463, Anti-detachment block; 5, Expansion assembly; 51, Inflatable airbag; 511, Inflatable tube; 52, Extrusion head; 521, Extrusion rod; 53, Second spring. Detailed Implementation

[0039] The following combination Figures 1-8 This application will be described in further detail. Example 1

[0040] This application discloses a gate valve that requires two-step opening and closing.

[0041] Reference Figure 1 , Figure 2 A two-step gate valve includes a valve body 1 and a gate 2. A flow channel 11 is provided inside the valve body 1 for the passage of a medium. A valve cover 14 is mounted on the valve body 1, and a valve stem 13 passes through the valve cover 14. The valve stem 13 and the valve cover 14 are threaded together (the thread of the valve stem 13 is shown in the figure). A handwheel 131 is mounted on the end of the valve stem 13 away from the valve body 1.

[0042] A mounting groove 12 is provided inside the valve body 1, and one end of the mounting groove 12 is connected to the flow channel 11. A mounting seat 3 is slidably installed in the mounting groove 12. In this embodiment, the mounting seat 3 includes a first mounting part 31 and a second mounting part 32. Both the first mounting part 31 and the second mounting part 32 are slidably installed in the mounting groove 12. The second mounting part 32 is located on the side of the first mounting part 31 closer to the flow channel 11. The end of the valve stem 13 away from the handwheel 131 passes through the mounting groove 12 and is rotatably connected to the first mounting part 31.

[0043] Reference Figure 2 , Figure 3 , Figure 4The gate 2 is disposed within the flow channel 11. A rotating column 21 is fixedly connected to the side wall of the gate 2 near the mounting groove 12. The rotating column 21 is rotatably connected to the second mounting part 32, and the gate 2 is rotatably mounted on the second mounting part 32 via the rotating column 21. It should be noted that in this embodiment, when the gate 2 moves into the mounting groove 12, the gate 2 fully opens the flow channel 11, and in this state, the plate surface of the gate 2 is not perpendicular to the medium flow direction. Specifically, when the gate 2 moves into the mounting groove 12, the angle between the plate surface of the gate 2 and the medium flow direction is between 8-15°. This can be understood as follows: when the gate 2 moves into the flow channel 11, if the gate 2 is not driven to rotate, the gate 2 does not completely close the flow channel 11.

[0044] Reference Figure 2 , Figure 3 The mounting base 3 is provided with a drive assembly 4 for driving the gate 2 to rotate. In this embodiment, the drive assembly 4 includes a drive sleeve 41 and a drive column 42. One end of the drive sleeve 41 is fixedly installed on the side wall of the first mounting part 31 near the second mounting part 32. The drive sleeve 41 and the rotating column 21 are coaxially arranged, and the end of the rotating column 21 away from the gate 2 extends into the drive sleeve 41. The drive column 42 is fixedly installed on the inner peripheral wall of the drive sleeve 41, and the outer peripheral wall of the rotating column 21 is provided with a guide groove 211 for the drive column 42 to be inserted. When the first mounting part 31 drives the gate 2 to move into the flow channel 11 and continues to drive the first mounting part 31 to slide towards the side closer to the flow channel 11, the drive column 42 forces the gate 2 to rotate through the guide groove 211 to close the flow channel 11.

[0045] The guide groove 211 has a first point 212 and a second point 213 at its two ends. The first point 212 and the second point 213 are offset around the circumference of the rotating column 21, and the second point 213 is located on the side of the first point 212 closer to the flow channel 11. When the gate plate 2 moves into the mounting groove 12, the driving column 42 is located at the first point 212. When the gate plate 2 moves into the flow channel 11 and forces the driving column 42 to move into the second point 213, the gate plate 2 closes the flow channel 11. It should be noted that in this embodiment, there are multiple driving columns 42 (only one is shown in the figure). The multiple driving columns 42 are arranged at intervals around the central axis of the driving sleeve 41, and the number of corresponding guide grooves 211 is set accordingly.

[0046] The second mounting part 32 is adapted to the cross-sectional shape of the mounting groove 12. When the gate 2 moves into the flow channel 11, the second mounting part 32 blocks the groove of the mounting groove 12 near the flow channel 11.

[0047] A sealing ring groove 22 is provided on the side wall of the gate 2, and a sealing ring 23 is embedded in the sealing ring groove 22. The sealing ring 23 is annular, and the rotating column 21 passes through the sealing ring 23. When the plate surface of the gate 2 rotates to be perpendicular to the medium flow direction, the sealing ring 23 abuts against the inner wall of the flow channel 11 to completely close the flow channel 11. A limit strip 15 is fixedly installed on the inner wall of the flow channel 11. When the gate 2 completely closes the flow channel 11 (i.e., when the plate surface of the gate 2 rotates to be perpendicular to the medium flow direction), the limit strip 15 abuts against the plate surface of the gate 2. A sealing strip is embedded in the limit strip 15 near the side wall of the gate 2.

[0048] The implementation principle of Embodiment 1 of this application is as follows: When the valve body 1 is opened, the handwheel 131 is turned to drive the valve stem 13 to rotate, thereby driving the first mounting part 31 to slide away from the flow channel 11, forcing the drive column 42 to slide from the second point 213 to the first point 212, thereby driving the rotating column 21 to rotate, causing the gate plate 2 to flip at a certain angle, opening the flow channel 11 to achieve pressure relief. By continuing to turn the handwheel 131, the gate plate 2 can be moved into the mounting groove 12, thereby fully opening the flow channel 11.

[0049] When valve body 1 is closed, the handwheel 131 is rotated in the opposite direction, causing the first mounting part 31 to slide towards the side closer to the flow channel 11, thereby bringing the gate 2 into the flow channel 11. After the gate 2 enters the flow channel 11, the handwheel 131 is rotated again, forcing the drive pin 42 to slide from the first position 212 to the second position 213, thereby forcing the gate 2 to rotate at a certain angle, thus completely closing valve body 1. By utilizing the rotation of the gate 2, the pressure from the medium on the gate 2 is released in advance, reducing the workload of the operator during the opening and closing process and improving the ease of opening and closing the gate valve under high-pressure media. Example 2

[0050] This application discloses a gate valve that requires two-step opening and closing.

[0051] The difference between the two-step opening and closing gate valve disclosed in this application and Embodiment 1 is that:

[0052] Reference Figure 5 , Figure 6 In this embodiment, the drive assembly 4 includes a first drive bar 43, a second drive bar 44, a connecting rod 45, and a drive component. One end of the first drive bar 43 is fixedly connected to the outer peripheral wall of the rotating column 21. The second drive bar 44 is slidably mounted on the side wall of the second mounting part 32 near the first mounting part 31, so as to be able to approach or move away from the rotating column 21. One end of the connecting rod 45 is hinged to the first drive bar 43, and the other end is hinged to the second drive bar 44. It should be noted that in this embodiment, multiple first drive bars 43 are provided around the outer peripheral wall of the rotating column 21, and the number of corresponding second drive bars 44 and connecting rods 45 is arranged accordingly.

[0053] A driving component is disposed on the first mounting portion 31 to drive the second driving bar 44 to slide. In this embodiment, the driving component is a driving rod 46, one end of which is fixedly connected to the first mounting portion 31. The driving rod 46 gradually moves away from the rotating column 21 from the end near the first mounting portion 31 to the end away from the first mounting portion 31. A pushing groove 441 is provided on the side wall of the second driving bar 44. The end of the driving rod 46 away from the first mounting portion 31 passes through the pushing groove 441 and is fixedly mounted with an anti-detachment block 463. When the gate 2 moves into the flow channel 11 and continues to drive the first mounting portion 31 to slide towards the side closer to the flow channel 11, the driving rod 46 forces the rotating column 21 to rotate, so that the gate 2 completely closes the flow channel 11.

[0054] The implementation principle of Embodiment 2 of this application is as follows: When the gate plate 2 is located in the mounting groove 12, since the gate plate 2 cannot rotate when it is located in the mounting groove 12, when the first mounting part 31 is driven to slide towards the side closer to the flow channel 11, the drive rod 46 cannot push the second drive bar 44 to slide, thereby enabling the first mounting part 31 to drive the second mounting part 32 to slide towards the side closer to the flow channel 11.

[0055] When the first mounting part 31 drives the gate 2 into the flow channel 11, the gate 2 (i.e. the second mounting part 32) cannot continue to slide in this state. If the first mounting part 31 continues to be driven to slide towards the side closer to the flow channel 11, the second driving bar 44 can be driven to slide through the driving rod 46, forcing the gate 2 to rotate around the rotating column 21 at a certain angle to completely close the flow channel 11, thereby improving the operational convenience of the overall structure and making the opening and closing process of the valve body 1 more labor-saving. Example 3

[0056] This application discloses a gate valve that requires two-step opening and closing.

[0057] The difference between the two-step opening and closing gate valve disclosed in this application and Embodiment 2 is that:

[0058] Reference Figure 7 , Figure 8 In this embodiment, the drive rod 46 includes a vertical section 461 and an inclined section 462. One end of the vertical section 461 is fixedly installed on the side wall of the first mounting part 31 near the second mounting part 32. The other end of the vertical section 461 is connected to the inclined section 462. The inclined section 462 gradually moves away from the rotating column 21 from the end near the first mounting part 31 to the end away from the first mounting part 31. The anti-detachment block 463 is fixedly installed on the end of the inclined section 462 away from the vertical section 461.

[0059] A limiting groove is formed in the second mounting part 32, and a limiting rod 33 is slidably installed in the limiting groove. A first spring 331 is installed in the limiting groove. One end of the first spring 331 is fixedly connected to the limiting rod 33, and the other end is fixedly connected to the inner wall of the limiting groove. Under normal conditions, the first spring 331 forces the end face of the limiting rod 33 near the flow channel 11 to move into the limiting groove, and the first spring 331 forces the end face of the limiting rod 33 away from the flow channel 11 to protrude from the limiting groove so that the anti-detachment block 463 can abut against it. When the gate 2 closes the flow channel 11 and continues to drive the first mounting part 31 to slide towards the side closer to the flow channel 11, the anti-detachment block 463 of the inclined section 462 pushes the limiting rod 33 and forces the limiting rod 33 to abut against the surface of the gate 2 near the outlet end of the flow channel 11.

[0060] The gate 2 is provided with an expansion assembly 5, which is used to force the sealing ring 23 to press against the inner wall of the flow channel 11. In this embodiment, the expansion assembly 5 includes an expansion airbag 51 and an inflation component. The expansion airbag 51 is embedded in the sealing ring groove 22, and the sealing ring 23 is sleeved on the outside of the expansion airbag 51.

[0061] An inflatable component is disposed within the gate plate 2 to force the inflatable airbag 51 to inflate. An inflation chamber 24 is provided within the gate plate 2. The inflatable airbag 51 is connected to an inflation tube 511, with one end of the inflation tube 511 away from the inflatable airbag 51 connected to the inflation chamber 24. A tube slot is provided within the gate plate 2 for installing the inflation tube 511. The inflatable component includes a compression head 52 and a second spring 53. The compression head 52 is slidably mounted within the inflation chamber 24 and is fixedly connected to a compression rod 521. One end of the compression rod 521 protrudes from the end face of the rotating column 21 near the first mounting portion 31. The second spring 53 is disposed within the inflation chamber 24, with one end fixedly connected to the compression head 52 and the other end fixedly connected to the inner wall of the inflation chamber 24. Under normal conditions, the second spring 53 forces the compression head 52 to slide towards the side closer to the mounting groove 12, so that the first mounting portion 31 can abut against it. When the gate 2 closes the flow channel 11 and continues to drive the first mounting part 31 to slide towards the side closer to the flow channel 11, the first mounting part 31 pushes the extrusion rod 521 of the extrusion head 52 and squeezes the air in the inflation chamber 24 into the expansion airbag 51.

[0062] The implementation principle of Embodiment 3 of this application is as follows: After the valve stem 13 forces the gate 2 to completely close the flow channel 11, the valve stem 13 is rotated to force the first mounting part 31 to continue to slide towards the side closer to the flow channel 11. At this time, the inclined section 462 can push the limiting rod 33, forcing the limiting rod 33 to abut against the surface of the gate 2 near the outlet end of the flow channel 11, so that the limiting rod 33 and one of the limiting bars 15 are supported on the back of the gate 2, reducing the rotational burden of the rotating column 21 and reducing the possibility of the gate 2 rotating due to the pressure of the medium.

[0063] In addition, during the process of the limit rod 33 abutting against the surface of the gate plate 2 near the outlet end of the flow channel 11, the first mounting part 31 pushes the extrusion head 52, thereby squeezing the air in the inflation chamber 24 into the expansion airbag 51, forcing the expansion airbag 51 to expand and improving the sealing of the overall structure.

[0064] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gate valve with two-step opening and closing, characterized in that: The device includes a valve body (1) and a gate (2). The valve body (1) has a flow channel (11) and a mounting groove (12) respectively. One end of the mounting groove (12) is connected to the flow channel (11), and a mounting seat (3) is slidably installed in the mounting groove (12). A valve stem (13) is threaded onto the valve body (1), and one end of the valve stem (13) passes through the mounting groove (12) and is rotatably connected to the mounting seat (3). The gate (2) is located in the flow channel (11) and is connected to a rotating column (21). The rotating column (21) is rotatably connected to the mounting seat (3), and the mounting seat (3) is provided with a drive assembly (4) for driving the gate (2) to rotate. The mounting seat (3) includes a first mounting part (31) and a second mounting part (32). The first mounting part (31) is rotatably connected to the first mounting part (31), and the rotating column (21) is rotatably connected to the second mounting part (32). The drive assembly (4) includes a drive sleeve (41) and a drive column (42). The drive sleeve (41) is disposed on the first mounting part (31), and one end of the rotating column (21) extends into the drive sleeve (41). The drive column (42) is disposed on the inner peripheral wall of the drive sleeve (41), and the outer peripheral wall of the rotating column (21) is provided with a guide groove (211) for the drive column (42) to be embedded. When the first mounting part (31) drives the gate (2) to move into the flow channel (11) and continues to drive the first mounting part (31) to slide towards the side closer to the flow channel (11), the drive column (42) forces the gate (2) to rotate through the guide groove (211) to close the flow channel (11).

2. The gate valve with two-step opening and closing according to claim 1, characterized in that: The guide groove (211) has a first point (212) and a second point (213) at its two ends respectively. The first point (212) and the second point (213) are offset along the circumference of the rotating column (21), and the second point (213) is located on the side of the first point (212) that is close to the flow channel (11). When the gate (2) moves into the mounting groove (12), the driving column (42) is located at the first point (212). When the gate (2) moves into the flow channel (11) and forces the driving column (42) to move into the second point (213), the gate (2) closes the flow channel (11).

3. A two-step opening and closing gate valve according to claim 1, characterized in that: The second mounting part (32) is adapted to the cross-sectional shape of the mounting groove (12). When the gate (2) moves into the flow channel (11), the second mounting part (32) blocks the groove of the mounting groove (12) near the flow channel (11).

4. A two-step opening and closing gate valve according to claim 1, characterized in that: The mounting base (3) includes a first mounting part (31) and a second mounting part (32). The valve stem (13) is rotatably connected to the first mounting part (31), and the rotating column (21) is rotatably connected to the second mounting part (32). The drive assembly (4) includes a first drive bar (43), a second drive bar (44), a connecting rod (45), and a drive member. One end of the first drive bar (43) is connected to the outer peripheral wall of the rotating column (21), and the second drive bar (44) is slidably mounted on the second mounting part (32). One end of the connecting rod (45) is hinged to the first drive bar (43), and the other end is hinged to the second drive bar (44). The drive member is disposed on the first mounting part (31) to drive the second drive bar (44) to slide.

5. A two-step opening and closing gate valve according to claim 4, characterized in that: The driving component includes a driving rod (46), one end of which is connected to the first mounting part (31). The driving rod (46) moves away from the rotating column (21) from the end near the first mounting part (31) to the end away from the first mounting part (31). The second driving bar (44) has a push groove (441) through which the driving rod (46) passes. When the gate (2) moves into the flow channel (11) and continues to drive the first mounting part (31) to slide towards the side near the flow channel (11), the driving rod (46) forces the rotating column (21) to rotate so that the gate (2) closes the flow channel (11).

6. A two-step opening and closing gate valve according to claim 5, characterized in that: The drive rod (46) includes a vertical section (461) and an inclined section (462). One end of the vertical section (461) is connected to the first mounting part (31), and the other end of the vertical section (461) is connected to the inclined section (462). The inclined section (462) gradually moves away from the rotating column (21) from the end close to the first mounting part (31) to the end away from the first mounting part (31). The second mounting part (32) is slidably mounted with a limit rod (33). A first spring (331) is provided between the limit rod (33) and the second mounting part (32). When the gate (2) closes the flow channel (11) and continues to drive the first mounting part (31) to slide towards the side close to the flow channel (11), the inclined section (462) pushes the limit rod (33) and forces the limit rod (33) to abut against the surface of the gate (2) near the outlet end of the flow channel (11).

7. A two-step opening and closing gate valve according to claim 4, characterized in that: The side wall of the gate (2) is provided with a sealing ring groove (22), and a sealing ring (23) is embedded in the sealing ring groove (22); the gate (2) is provided with an expansion component (5), which is used to force the sealing ring (23) to press against the inner wall of the flow channel (11).

8. A two-step opening and closing gate valve according to claim 7, characterized in that: The expansion assembly (5) includes an expansion airbag (51) and an inflator. The expansion airbag (51) is embedded in a sealing ring groove (22), and a sealing ring (23) is disposed on the outside of the expansion airbag (51). The inflator is disposed in a gate (2) to force the expansion airbag (51) to expand.

9. A two-step opening and closing gate valve according to claim 8, characterized in that: An inflation chamber (24) is provided inside the gate (2). An inflation bladder (51) is connected to an inflation tube (511). One end of the inflation tube (511) is connected to the inflation chamber (24). The inflation component includes a compression head (52) and a second spring (53). The compression head (52) is slidably installed in the inflation chamber (24). The compression head (52) is connected to a compression rod (521). One end of the compression rod (521) passes through the rotating column (21) and is close to the end face of the first mounting part (31). The second spring (53) is located between the compression head (52) and the inner wall of the inflation chamber (24). When the gate (2) closes the flow channel (11) and continues to drive the first mounting part (31) to slide towards the side close to the flow channel (11), the first mounting part (31) pushes the compression head (52) and squeezes the air in the inflation chamber (24) into the inflation bladder (51).

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