Flow and pressure regulating valve group for head of canal

Abstract

The application relates to the technical field of flow-regulating and pressure-regulating valves, and discloses a flow-regulating and pressure-regulating valve group for a head channel pressure stabilizing tower, which comprises a valve body, a flow-through cavity for water flow is arranged in the inner side of the valve body, a piston for closing the flow-through cavity is slidably connected to one side of the valve body, and a squirrel cage for adjusting the opening degree of the flow-through cavity is fixedly connected to one side of the piston. The cavity close to the first connecting pipe is compressed by the sliding plug, the medium is filled into the first sealing capsule cavity through the first connecting pipe under the action of water pressure, the sealing pressure is increased under the condition that the pressure difference on the two sides of the sealing capsule is large, the adjusting rod is reset when the valve body is opened, the sliding plug is reset through the convex block, the extra pressure is removed, and when multiple groups of sealing capsules are arranged, the sealing capsule in contact with the sliding plug is switched through the adjusting mechanism, so that the sealing is reliable, the service life of the sealing capsule is prolonged, and the working condition that the head channel pressure stabilizing tower needs to be frequently adjusted is adapted.

Description

Technical Field

[0001] This application relates to the field of flow regulating and pressure regulating valve technology, and in particular to a flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower. Background Technology

[0002] The headworks pressure stabilizing tower is a water pressure stabilizing device used to connect the end branch pipe section of the water conveyance tunnel to the headworks of the main canal. During the water pressure regulation process of the pressure stabilizing tower, a flow regulating and pressure regulating valve group installed in the flow regulating and pressure regulating chamber is used to adjust the opening of several steel pipes connected to the branch pipes, thereby regulating the flow rate delivered to the stabilization pool to ensure that the water level in the stabilization pool remains constant within the rated elevation. The existing flow regulating and pressure regulating valve includes a valve body with a flow chamber on the inside for connecting the two pipes. A piston is installed inside the valve body, and the valve body is slidably connected to the piston through an elastic sealing ring. A squirrel cage is fixed to one end of the piston. Several pressure regulating valves are respectively installed on the corresponding water conveyance pipes. In use, the piston is driven axially by a drive mechanism to adjust the corresponding area of ​​the flow chamber, piston wall, and squirrel cage, thereby adjusting the opening of the flow chamber. The overall opening of the flow regulating and pressure regulating valve group is adjusted according to the needs of the stabilization pool.

[0003] However, in the use of traditional flow regulating valves, the pressure stabilizing tower needs to frequently adjust the opening of the flow regulating valve according to the liquid level height maintained by the flow stabilizing tank. For example, after the water level in the flow stabilizing tank continues to rise above the constant water level, it is necessary to open the vent valve of the flow stabilizing tank and close the flow regulating valve at the same time. This causes the sealing ring to rub against the piston for a long time, requiring frequent maintenance and repair. Moreover, when the flow regulating valve is closed, the water pressure difference on both sides of the sealing ring is greater than when the valve body is open. In order to ensure the sealing performance of the sealing ring, the sealing ring needs to be installed in the valve body with the maximum contact pressure required to seal the piston. As a result, when the valve body is open, even when the water pressure at both ends of the sealing ring is similar, the sealing ring still rubs against the piston with a higher contact pressure, resulting in additional wear and increased downtime maintenance frequency. This affects the normal use of water conservancy projects, making it difficult for traditional flow regulating valve groups to adapt to the working conditions of the headworks pressure stabilizing tower that require frequent adjustments. Summary of the Invention

[0004] This application proposes a flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower, which has the advantage of dynamically adjusting the contact pressure between the sealing ring and the piston to extend the service life of the sealing ring, thereby solving the problem of short service life when the sealing ring contacts the piston at a large pressure and the piston needs to be frequently adjusted.

[0005] To achieve the above objectives, this application adopts the following technical solution: a flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower, comprising a valve body, a flow chamber for water flow is provided on the inner side of the valve body, a piston for closing the flow chamber is slidably sleeved on one side of the valve body, a squirrel cage for adjusting the opening of the flow chamber is fixedly connected to one side of the piston, a first sealing bladder is fixedly provided on the inner side of the valve body, a second sealing bladder is fixedly provided on one side of the valve body, a fixed box is fixedly provided on one side of the fixed box, a fixed cylinder is fixedly provided on one side of the fixed box, an exchange pipe is fixedly connected to one side of the bottom of the fixed cylinder, a first connecting pipe is fixedly connected to the top of the fixed cylinder, a sliding plug is slidably sleeved inside the fixed cylinder, and an adjusting rod is slidably sleeved on one side of the fixed cylinder;

[0006] It also includes an adjustment mechanism, which can drive the adjustment rod to move in coordination with the water inlet pressure of the exchange pipe to adjust the position of the sliding plug, so that the sliding plug adjusts the medium pressure in the No. 1 connecting pipe according to the corresponding position of the piston, the squirrel cage and the flow chamber, and increases the contact pressure between the No. 1 sealing bag and the piston when the piston closes the flow chamber.

[0007] Furthermore, a protrusion is fixedly provided at the top position of the adjusting rod, and both the first and second sealing bladders are made of elastic, hollow bladders. The first connecting pipe connects the fixed cylinder to the corresponding first sealing bladder. A second connecting pipe is fixedly provided on one side of the valve body. The number of valve bodies is set to several, and several valve bodies cooperate to form a flow regulating and pressure regulating valve group.

[0008] Furthermore, a drive shaft is rotatably mounted on one side of the valve body, and the drive shaft is rotatably sleeved with the fixed box. The adjustment mechanism includes an adjustment disc, which is fixedly sleeved on the outside of the drive shaft. An adjustment groove is opened on one end face of the adjustment disc, and a limit groove is opened on one end face of the adjustment disc. The adjustment groove and the limit groove form a curved groove. An adjustment shaft is movably sleeved in the curved groove. A connecting block is fixedly connected to the bottom of the adjustment rod, and the connecting block is fixedly connected to the adjustment shaft.

[0009] Furthermore, the extension length of the curved groove is adapted to the rotation range of the drive shaft. The distance from different positions of the adjustment groove to the axis of the drive shaft is different and the distance changes in one direction, so that when the adjustment shaft slides from one end of the adjustment groove to the other end, the distance from the adjustment shaft to the drive shaft changes in one direction. The distance from the limiting groove to the axis of the drive shaft is equal.

[0010] Furthermore, the number of the first sealing bladder and the second sealing bladder is set to two. A limit rod is slidably provided on one side of the fixed cylinder. A protrusion is fixedly provided on the limit rod near the top position. A movable rod is fixedly connected to one end of the limit rod. A reciprocating screw is provided at one end of the movable rod, which can drive the movable rod to move axially back and forth. The reciprocating screw is threadedly connected to the movable rod. An overrunning mechanism is provided at the bottom of the reciprocating screw.

[0011] Furthermore, the number of the fixed cylinder, the second connecting pipe, and the curved groove are matched with the number of the first sealing bladder. The positions of the limiting rods and the limiting sliding plugs corresponding to the two fixed cylinders are different, so that the protrusion of one of the two limiting rods is close to the first connecting pipe, and the protrusion of the other limiting rod is far away from the first connecting pipe.

[0012] Furthermore, the overtaking mechanism includes an external gear, which is rotatably disposed on one side of the fixed box. A ratchet is rotatably disposed on the inner side of the external gear. A stop pawl is rotatably connected to one side of the external gear. A spring is fixedly connected to one side of the stop pawl. The ratchet is coaxially fixedly connected to the reciprocating screw.

[0013] Furthermore, a rack is provided on one side of the overtaking mechanism, and sliding rods are fixedly connected to both ends of the rack. The sliding rods are slidably sleeved with the fixed box. A baffle is fixedly provided on one side of the rack, and a spring is fixedly connected to one side of the baffle. The rack meshes with the external gear. A moving rod is fixedly connected between the two corresponding sliding rods, and a connecting rod is fixedly connected to one side of the moving rod.

[0014] Furthermore, a crank is fixedly sleeved on the shaft of the drive shaft, one end of the crank is rotatably connected to a transmission rod, one end of the transmission rod is rotatably connected to a sliding frame, and the sliding frame is fixedly sleeved with the piston.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This application provides a flow and pressure regulating valve assembly for a headworks pressure stabilizing tower. A drive shaft rotates a regulating disc, causing a regulating rod to move according to the corresponding positions of the piston, squirrel cage, and flow chamber. When the piston moves away from the drive shaft and closes the flow chamber, the regulating rod moves closer to the first connecting pipe, allowing the sliding plug to move and compress the cavity near the first connecting pipe. Water is then introduced into the fixed cylinder through the exchange pipe, and the water pressure pushes the sliding plug to move, filling the medium into the first sealing chamber through the first connecting pipe. This increases the sealing pressure when the valve body is closed and the pressure difference between the two sides is large. When the valve body is open, the regulating rod resets, and the protrusion drives the sliding plug to reset, thus removing the additional pressure. This allows the sealing chamber to contact the piston at the corresponding pressure when the pressure difference between the two sides is small, ensuring sealing stability while extending the service life of the sealing chamber and reducing the frequency of downtime maintenance.

[0017] 2. The flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower provided in this application uses an adjusting mechanism to drive a corresponding limit rod to restrict the position of a corresponding sliding plug, thereby switching the sliding plug whose position can be adjusted by the corresponding adjusting rod. This adjusts the pressure inside the corresponding sealing chamber and switches the contact state between different sealing chambers and the piston. Thus, without increasing the contact area involved in friction during operation and dynamically adjusting the sealing chamber pressure according to the piston position, the overall friction area is increased, further extending the service life of the sealing chamber. This makes the flow regulating and pressure regulating valve assembly adaptable to the frequent adjustment conditions required by the headworks pressure stabilizing tower. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0019] Figure 1 This is a schematic diagram of the flow control valve assembly structure of this application;

[0020] Figure 2 This is a partial cross-sectional view of the overall structure of the flow regulating valve in this application;

[0021] Figure 3 This is a schematic cross-sectional view of the valve body structure of this application;

[0022] Figure 4 This is a schematic diagram of the structure of the regulating disc in this application;

[0023] Figure 5 This is a schematic diagram of the reciprocating screw in this application;

[0024] Figure 6 This is a schematic diagram of the structure of the agency beyond the scope of this application;

[0025] Figure 7 This is a schematic diagram comparing the structural limiting positions at the limiting rod of this application.

[0026] In the diagram: 1. Valve body; 2. Flow chamber; 3. Piston; 4. Squirrel cage; 5. No. 1 sealing bladder; 6. No. 2 sealing bladder; 7. Overtaking mechanism; 701. External gear; 702. Ratchet; 703. Stop pawl; 8. Drive shaft; 9. Crank; 10. Transmission rod; 11. No. 1 connecting pipe; 12. Fixed box; 13. Adjusting disc; 14. Adjusting groove; 15. Limiting groove; 16. Connecting block; 17. Adjusting shaft; 18. Adjusting rod; 19. Fixed cylinder; 20. Sliding plug; 21. Exchange pipe; 22. Rack; 23. Sliding rod; 24. Reciprocating screw; 25. Movable rod; 26. Limiting rod; 27. Moving rod; 28. Connecting rod; 29. ​​Sliding frame; 30. No. 2 connecting pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1, as Figures 1-5 and Figure 7 A flow regulating and pressure regulating valve group for a headworks pressure stabilizing tower includes a valve body 1 of a flow regulating valve. The valve body 1 is installed on the corresponding water supply pipeline. The number of valve bodies 1 is set to several, and the several valve bodies 1 cooperate to form a pressure regulating valve group. The several valve bodies 1 adjust the opening of the corresponding water supply pipeline, thereby regulating the overall water supply flow. Specifically, a flow cavity 2 for water flow is opened on the inner side of the valve body 1. The two ends of the flow cavity 2 are respectively connected to the cavity of the corresponding connecting pipeline. A piston 3 for closing the flow cavity is slidably sleeved on one side of the valve body 1. The piston 3 can slide axially relative to the valve body 1. A squirrel cage 4 for adjusting the opening of the flow cavity is fixedly connected to one side of the piston 3.

[0029] A first sealing bladder 5 is fixedly installed on the inner side of the valve body 1, and a second sealing bladder 6 is fixedly installed on one side of the valve body 1. Both the first sealing bladder 5 and the second sealing bladder 6 are elastic bladders and are located between the valve body 1 and the piston 3, fitting against the outer wall of the piston 3. Both the first sealing bladder 5 and the second sealing bladder 6 can be rubber bladders. A drive shaft 8 is rotatably installed on one side of the valve body 1. The drive shaft 8 is driven to rotate by a drive assembly. A crank 9 is fixedly sleeved on the shaft of the drive shaft 8. A transmission rod 10 is rotatably connected to one end of the crank 9. A sliding frame 29 is rotatably connected to one end of the transmission rod 10. The sliding frame 29 is fixedly sleeved with the piston 3. The water outlet end of the flow chamber 2, that is, the end of the valve body 1 near the squirrel cage 4, is connected to the pipe that connects to the flow stabilizing tank.

[0030] During operation, the drive assembly drives the drive shaft 8 to rotate, which in turn drives the crank 9 to rotate. The crank 9 drives one end of the transmission rod 10 to rotate around the axis of the drive shaft 8, causing the transmission rod 10 to drive the sliding frame 29 to move axially. The sliding frame 29 then drives the piston 3 to move axially, thereby adjusting the corresponding positions of the piston 3 and the squirrel cage 4 with the flow chamber 2, and adjusting the opening of the flow chamber 2. When the piston 3 and the flow chamber 2 are in the same position, and the piston 3 closes the flow chamber 2, the water pressure inside the piston 3 is relatively large compared to the water pressure inside the flow chamber 2. When the squirrel cage 4 is in the same position as the flow chamber 2, the flow chamber 2 is in the maximum opening state, and the water flows through the grid-shaped outer wall of the squirrel cage 4 to the front pipe. At this time, the water pressure inside the piston 3 is relatively small compared to the water pressure inside the flow chamber 2.

[0031] A fixed housing 12 is fixedly installed on one side inside the valve body 1. The drive shaft 8 is rotatably sleeved with the fixed housing 12. A fixed cylinder 19 is fixedly installed on one side inside the fixed housing 12. An exchange pipe 21 is fixedly connected to one side of the bottom of the fixed cylinder 19. The exchange pipe 21 is fixedly sleeved with the valve body 1. One end of the exchange pipe 21 extends into the flow chamber 2. (See reference...) Figure 3 A first connecting pipe 11 is fixedly connected to the top of the fixed cylinder 19. Both the first sealing bladder 5 and the second sealing bladder 6 are hollow bladders. The first connecting pipe 11 connects the fixed cylinder 19 to the corresponding first sealing bladder 5. A second connecting pipe 30 is fixedly installed on one side of the valve body 1, connecting to the corresponding first sealing bladder 5 and second sealing bladder 6. (See reference...) Figure 7 A sliding plug 20 is slidably sleeved inside the fixed cylinder 19. The first connecting pipe 11 and the exchange pipe 21 are located at the top and bottom of the sliding plug 20, respectively. An adjusting rod 18 is slidably sleeved on one side of the fixed cylinder 19.

[0032] A protrusion is fixedly installed near the top of the adjusting rod 18 to limit the sliding plug 20 from approaching the first connecting pipe 11. An adjusting disc 13 is installed on one side inside the fixed box 12. The adjusting disc 13 is fixedly sleeved on the outside of the drive shaft 8. An adjusting groove 14 and a limiting groove 15 are opened on one end face of the adjusting disc 13. The adjusting groove 14 and the limiting groove 15 are connected to form a curved groove. An adjusting shaft 17 is movably sleeved in the curved groove. The adjusting shaft 17 can be slidably connected to the curved groove through a bearing. The extension length of the curved groove is related to the drive shaft 8. The rotation range of the drive shaft 8 is adapted to the driving shaft 8. When the drive shaft 8 rotates within the rated range, the adjusting shaft 17 slides along the curved groove. The distance from different positions of the adjusting groove 14 to the axis of the drive shaft 8 is different and changes in one direction. That is, when the adjusting shaft 17 slides from one end of the adjusting groove 14 to the other end, the distance from the adjusting shaft 17 to the drive shaft 8 increases or decreases in one direction. The distance from the groove of the limiting groove 15 to the axis of the drive shaft 8 is equal. The bottom of the adjusting rod 18 is fixedly connected to the connecting block 16, and the connecting block 16 is fixedly connected to the adjusting shaft 17.

[0033] During operation, the drive shaft 8 rotates, thereby driving the piston 3 to move and simultaneously driving the adjusting plate 13 to rotate. The adjusting plate 13 drives the curved groove to rotate relative to the adjusting shaft 17. When the flow chamber 2 switches from open to closed, the piston 3 drives the squirrel cage 4 to move away from the corresponding position in the flow chamber 2. The piston 3 moves to close the flow chamber 2. During this process, the adjusting shaft 17 slides along the limiting groove 15. When the piston 3 is about to close the flow chamber 2, the adjusting shaft 17 slides from the limiting groove 15 into the adjusting groove 14, and continues to slide from the end of the adjusting groove 14 near the axis of the drive shaft 8 to the end away from the axis of the drive shaft 8, until the piston 3 completes to close the flow chamber 2. At this time, the inner wall of the adjusting groove 14 abuts against the adjusting shaft 17 and drives the adjusting shaft 17 to move radially, so that the adjusting shaft 17 drives the connecting block 16 to move, and liquid can be filled into the first sealing bladder 5 and the second sealing bladder 6.

[0034] The connecting block 16 drives the adjusting rod 18 to move the protrusion to a position close to the first connecting pipe 11, removing the limit on the sliding plug 20. High-pressure water is filled into the cavity of the fixed cylinder 19 located at the bottom of the sliding plug 20 through the exchange pipe 21 and pushes the sliding plug 20 to move. The sliding plug 20 fills the first sealing bladder 5 through the first connecting pipe 11 and continues to fill the corresponding second sealing bladder 6 through the second connecting pipe 30. This increases the contact pressure between the first sealing bladder 5 and the second sealing bladder 6 and the outer wall of the piston 3 when the piston 3 closes the valve body 1, ensuring the reliability of the seal and compensating for wear. This reduces the contact pressure between the piston 3 and the first sealing bladder 5 and the second sealing bladder 6 when the water pressure on both sides is similar when the piston 3 moves. While ensuring the stability of the seal, it reduces the wear of the first sealing bladder 5 and the second sealing bladder 6, increases the service life, and extends the maintenance cycle of the flow regulating valve.

[0035] Example 2, as Figures 2-7 Based on Embodiment 1, the number of sealing bladder 5 and sealing bladder 6 is set to two. The number of fixing cylinders 19, connecting pipe 30, and curved grooves is adapted to the number of sealing bladders 5. The two fixing cylinders 19 are symmetrically arranged about the center plane of the adjusting plate 13. A limiting rod 26 is slidably provided on one side of the fixing cylinder 19. A protrusion is fixedly provided near the top of the limiting rod 26 to limit the sliding plug 20 from approaching the connecting pipe 11. (See reference...) Figure 7 The positions of the limiting rods 26 and the limiting sliding plugs 20 corresponding to the two fixed cylinders 19 are different.

[0036] That is, when the protrusion of one of the two limiting rods 26 is close to the first connecting pipe 11, the sliding plug 20 moves in the same way as the sliding plug 20 in Embodiment 1, and can move axially with the adjusting rod 18 under the action of water pressure. When the protrusion of the other limiting rod 26 is far away from the first connecting pipe 11, the limiting rod 26, in conjunction with the corresponding protrusion, drives the sliding plug 20 to move to a position far away from the first connecting pipe 11, until the sliding plug 20 draws in some air from the first connecting pipe 11, causing the corresponding first sealing bladder 5 and second sealing bladder 6 to contract to the rated amount and remove contact with the piston 3, thus avoiding multiple first sealing bladders 5 and second sealing bladders 6 from contacting the piston 3 at the same time. When the corresponding adjusting rod 18 moves axially, the corresponding sliding plug 20 remains stationary relative to the fixed cylinder 19 due to the limiting of the limiting rod 26.

[0037] One end of the limiting rod 26 is fixedly connected to a movable rod 25. One end of the movable rod 25 is provided with a reciprocating screw 24. The reciprocating screw 24 is threadedly connected to the movable rod 25. The rotation of the reciprocating screw 24 can drive the movable rod 25 to move axially back and forth. The bottom of the reciprocating screw 24 is provided with an overrunning mechanism 7. Specifically, the overrunning mechanism 7 includes an external gear 701. The external gear 701 is rotatably disposed on one side inside the fixed box 12. A ratchet 702 is rotatably disposed on the inner side of the external gear 701. A stop pawl 703 is rotatably connected to one side of the external gear 701. A spring is fixedly connected to one side of the stop pawl 703 for pushing the stop pawl 703 to engage in the ratchet teeth of the ratchet 702. The external gear 701, together with the stop pawl 703 and the spring, is used to drive the ratchet 702 to rotate in one direction. The ratchet 702 is fixedly connected to the reciprocating screw 24 in a coaxial manner.

[0038] A rack 22 is provided on one side of the overtaking mechanism 7. Sliding rods 23 are fixedly connected to both ends of the rack 22. The sliding rods 23 are slidably sleeved with the fixed box 12. A baffle is fixedly provided on one side of the rack 22. A spring is fixedly connected to one side of the baffle. The spring tends to push the baffle to move, thereby driving the rack 22 to move towards the sliding frame 29. This is used to push the rack 22 to reset later. The rack 22 meshes with the external gear 701. A moving rod 27 is fixedly connected between the two corresponding sliding rods 23. A connecting rod 28 is fixedly connected to one side of the moving rod 27.

[0039] During operation, the drive shaft 8 rotates, causing the transmission rod 10 to move the sliding frame 29 closer to the fixed box 12. The piston 3 moves the squirrel cage 4 closer to the drive shaft 8, increasing the area of ​​the area corresponding to the flow chamber 2 until the squirrel cage 4 is in place, maximizing the opening of the flow chamber 2. At this point, the sliding frame 29 moves to contact the connecting rod 28. The drive shaft 8 continues to rotate, causing the piston 3 to continue to approach the drive shaft 8 while maintaining contact with the first sealing bladder 5. The adjusting shaft 17 slides along the limiting groove 15. The sliding frame 29 abuts against the connecting rod 28, causing the connecting rod 28 to move closer to the fixed box 12. The connecting rod 28 moves the moving rod 27, which in turn moves the sliding rod 23, thereby causing the rack 22 to move relative to the external gear 701. The rack 22 then drives the external gear 701 to rotate. The external gear 701, in conjunction with the corresponding spring and stop pawl 703, drives the ratchet 702 to rotate.

[0040] Ratchet 702 drives reciprocating screw 24 to rotate at a rated angle until movable rod 25 slides from one end of reciprocating screw 24 to the other end, thereby causing movable rod 25 to drive corresponding limit rod 26 to move, changing the position of the two limit rods 26 limiting the corresponding sliding plug 20. That is, the limit rod 26 switches between positions close to and away from the first connecting pipe 11, switching the contact state between the first sealing bladder 5, the second sealing bladder 6 and the piston 3. Without increasing the area of ​​the sliding friction surface with the piston, and on the basis of dynamically adjusting the sealing pressure, the total area that can participate in friction is increased, thereby further extending the overall service life of the first sealing bladder 5 and the second sealing bladder 6. This makes the flow regulating and pressure regulating valve group adaptable to the flow regulating conditions of the pressure stabilizing tank that require frequent flow adjustment, improving the adaptability and reliability of the flow regulating and pressure regulating valve group. When the sliding frame 29 moves away from the fixed box 12, the rack 22 is reset under the push of the corresponding spring. At this time, the external gear 701 rotates relative to ratchet 702.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower, comprising a valve body (1), wherein a flow chamber (2) for water flow is provided on the inner side of the valve body (1), a piston (3) for closing the flow chamber is slidably sleeved on one side of the valve body (1), and a squirrel cage (4) for adjusting the opening of the flow chamber is fixedly connected to one side of the piston (3), characterized in that, A first sealing bladder (5) is fixedly installed on the inner side of the valve body (1), a second sealing bladder (6) is fixedly installed on one side of the valve body (1), a fixed box (12) is fixedly installed on one side of the valve body (1), a fixed cylinder (19) is fixedly installed on one side of the fixed box (12), an exchange pipe (21) is fixedly connected to one side of the bottom of the fixed cylinder (19), a first connecting pipe (11) is fixedly connected to the top of the fixed cylinder (19), a sliding plug (20) is slidably sleeved inside the fixed cylinder (19), and an adjusting rod (18) is slidably sleeved on one side of the fixed cylinder (19). It also includes an adjustment mechanism, which can drive the adjustment rod (18) to move in coordination with the water inlet pressure adjustment of the exchange pipe (21) to adjust the position of the sliding plug (20), so that the sliding plug (20) adjusts the medium pressure in the first connecting pipe (11) according to the corresponding position of the piston (3), the cage (4) and the flow chamber, and increases the contact pressure between the first sealing bag (5) and the piston (3) when the piston (3) closes the flow chamber (2).

2. The flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 1, characterized in that, The adjusting rod (18) has a protrusion fixedly installed at the top position. The first sealing bladder (5) and the second sealing bladder (6) are both set as elastic, hollow bladders. The first connecting pipe (11) connects the fixed cylinder (19) and the corresponding first sealing bladder (5). The second connecting pipe (30) is fixedly installed on one side of the valve body (1). The number of valve bodies (1) is set to several, and several valve bodies (1) cooperate to form a flow regulating and pressure regulating valve group.

3. The flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 1, characterized in that, A drive shaft (8) is rotatably mounted on one side of the valve body (1). The drive shaft (8) is rotatably sleeved with the fixed box (12). The adjustment mechanism includes an adjustment disc (13). The adjustment disc (13) is fixedly sleeved on the outside of the drive shaft (8). An adjustment groove (14) is opened on one end face of the adjustment disc (13). A limit groove (15) is opened on one end face of the adjustment disc (13). The adjustment groove (14) and the limit groove (15) form a curved groove. An adjustment shaft (17) is movably sleeved in the curved groove. A connecting block (16) is fixedly connected to the bottom of the adjustment rod (18). The connecting block (16) is fixedly connected to the adjustment shaft (17).

4. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 3, characterized in that, The extension length of the curved groove is adapted to the rotation range of the drive shaft (8). The distance from different positions of the adjustment groove (14) to the axis of the drive shaft (8) is different and changes in one direction. When the adjustment shaft (17) slides from one end of the adjustment groove (14) to the other end, the distance from the adjustment shaft (17) to the drive shaft (8) changes in one direction. The distance from the groove of the limiting groove (15) to the axis of the drive shaft (8) is equal.

5. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 3, characterized in that, The number of the first sealing bladder (5) and the second sealing bladder (6) are both set to two. A limit rod (26) is slidably provided on one side of the fixed cylinder (19). A protrusion is fixedly provided on the top position of the limit rod (26). A movable rod (25) is fixedly connected to one end of the limit rod (26). A reciprocating screw (24) is provided at one end of the movable rod (25) to drive the movable rod (25) to move axially back and forth. The reciprocating screw (24) is threadedly connected to the movable rod (25). An overrunning mechanism (7) is provided at the bottom of the reciprocating screw (24).

6. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 5, characterized in that, The number of fixed cylinders (19) and second connecting pipes (30), and the number of curved grooves are matched with the number of first sealing bladders (5). The positions of the limiting rods (26) and the limiting sliding plugs (20) corresponding to the two fixed cylinders (19) are different, so that the protrusion of one of the two limiting rods (26) is close to the first connecting pipe (11), and the protrusion of the other limiting rod (26) is far away from the first connecting pipe (11).

7. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 5, characterized in that, The overtaking mechanism (7) includes an external gear (701), which is rotatably disposed on one side inside the fixed box (12). A ratchet (702) is rotatably disposed on the inner side of the external gear (701). A stop pawl (703) is rotatably connected to one side of the external gear (701). A spring is fixedly connected to one side of the stop pawl (703). The ratchet (702) is fixedly connected to the reciprocating screw (24) in a coaxial manner.

8. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 5, characterized in that, A rack (22) is provided on one side of the overtaking mechanism (7). Sliding rods (23) are fixedly connected to both ends of the rack (22). The sliding rods (23) are slidably sleeved with the fixed box (12). A baffle is fixedly provided on one side of the rack (22). A spring is fixedly connected to one side of the baffle. The rack (22) meshes with the external gear (701). A moving rod (27) is fixedly connected between the two corresponding sliding rods (23). A connecting rod (28) is fixedly connected to one side of the moving rod (27).

9. A flow regulating and pressure regulating valve assembly for a headworks pressure stabilizing tower according to claim 3, characterized in that, The drive shaft (8) has a crank (9) fixedly sleeved on its shaft body. One end of the crank (9) is rotatably connected to a transmission rod (10). One end of the transmission rod (10) is rotatably connected to a sliding frame (29). The sliding frame (29) is fixedly sleeved with the piston (3).

Images