Multi-stage pressure reduction intelligent noise reduction conical regulating valve
Through the design of a multi-stage pressure-reducing intelligent silencer conical regulating valve, the conical valve core and guide vanes are used to separate the flow channel. Combined with the pressure-reducing guide cover and multi-stage pressure-reducing orifice plate, the cavitation, vibration and noise problems during the discharge of the bypass valve of the hydro-turbine generator set are solved, and the construction cost of the energy dissipation pool is reduced.
Patent Information
- Application Number
- CN202520174739.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2035-01-26
AI Technical Summary
When the bypass valve of the existing hydro-generator set is discharged, the outlet fluid pressure is high, which causes cavitation, vibration and noise, and requires an energy dissipation pool, which increases construction costs.
A multi-stage pressure-reducing intelligent silencer conical regulating valve is designed. The conical valve core and guide vanes are used to separate the flow channel. Combined with the pressure-reducing guide cover and the multi-stage pressure-reducing orifice plate, the fluid energy is reduced by mixing the fluid with the air.
It achieves good fluid energy dissipation effect, small cavitation and vibration, low noise, and greatly reduces the construction cost of the energy dissipation pool.
Smart Images
Figure CN223331261U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of valves, and in particular relates to a multi-stage pressure-reducing intelligent silencer conical regulating valve. The utility model is suitable for use as a bypass discharge valve in hydro-generator sets or small and medium-sized water conservancy projects. Background Art
[0002] When a hydroelectric generator set is shut down for maintenance, the inlet water needs to be discharged through a bypass valve on the bypass pipe. Existing bypass valves generally use stop valves, butterfly valves, or ball valves. When the hydroelectric generator set is operating normally, the bypass valve is normally closed. When the hydroelectric generator set is shut down for maintenance, the inlet valve is closed and the bypass valve is opened to discharge water, ensuring safe maintenance of the hydroelectric generator set. However, a major problem with this type of hydroelectric generator bypass valve is that the pressure of the discharged fluid at the bypass valve outlet is very high during discharge. This generally requires an energy dissipation tank at the bypass valve outlet, increasing the construction cost of the discharge system. Furthermore, the high-pressure water flow causes cavitation and vibration in the bypass pipe, resulting in a very loud noise. Utility Model Content
[0003] In response to the problems existing in the prior art, the utility model provides a multi-stage pressure-reducing intelligent silencer conical regulating valve which can perform multi-stage pressure reduction on the discharged fluid. By controlling the discharge angle of the fluid, the fluid and air are fully mixed, the energy dissipation effect is good, cavitation and vibration are small, and noise is low, which can significantly reduce the construction cost of the energy dissipation pool.
[0004] The technical solution of the utility model is:
[0005] A multi-stage pressure-reducing intelligent silencer conical regulating valve comprises a valve body, a valve core, an opening and closing assembly, a transmission assembly and an actuator. The valve body adopts a circular tube structure and is composed of a buried pipeline and an outlet pipeline connected by a flange. The inlet end of the buried pipeline is connected to the system pipeline. The valve core adopts a conical valve core, and a valve core sealing surface is provided on the outer circumferential surface at the maximum diameter of the conical valve core. The valve core is characterized in that a plurality of guide vanes are evenly arranged in the circumferential direction on one side of the conical surface of the conical valve core, and each guide vane extends radially from the center line of the conical valve core, and the outer end face is welded to the inner wall of the valve body outlet pipeline. There is an axial distance between the end face of the valve body outlet pipe and the valve core sealing surface, and a number of flow windows are formed between the axial distance and the guide vanes; the opening and closing assembly is composed of a sleeve arranged for dynamic sealing on the outer circumference of the valve body outlet pipe, the outer circumferential surface of the sleeve is connected to the actuator through a transmission assembly, and a sealing surface that cooperates with the valve core sealing surface is provided on the end face of the sleeve located on the side of the valve core sealing surface; a pressure reducing guide cover is arranged on the outer circumference of the valve body outlet pipe, and an annular flow channel is formed between the inner wall of the pressure reducing guide cover and the flow window, and a number of pressure reducing orifice plates are arranged axially in the pressure reducing guide cover.
[0006] In the above technical solution, the transmission assembly consists of a main bevel gear transmission device and a first sub-bevel gear transmission device and a second sub-bevel gear transmission device symmetrically arranged on both sides of the valve body; the main bevel gear transmission device consists of a driving gear and a first driven gear and a second driven gear that are meshed with the driving gear; the first sub-bevel gear transmission device consists of a first driving bevel gear and a first driven bevel gear, and the second sub-bevel gear transmission device consists of a second driving bevel gear and a second driven bevel gear; the driving gear is fixedly connected to the transmission shaft of the actuator, and the first driven gear and the second driven gear are respectively connected to the first driving bevel gear and the second driving bevel gear through a transmission rod; the first driven bevel gear and the second driven bevel gear are respectively threadedly connected to the screw holes of the transmission blocks arranged on both sides of the outer circumference of the sleeve through screws.
[0007] In the above technical solution, the valve core sealing surface is composed of a metal sealing surface on the radial outer surface of the conical valve core and a fluoroplastic sealing ring, and the fluoroplastic sealing ring is fixedly mounted on the annular step at the right end of the conical valve core by a pressure plate.
[0008] In the above technical solution, a sealing ring is provided on the outer circular surface of the right end of the outlet pipe to dynamically seal with the inner hole wall of the sleeve, and mutually cooperating axial guide ribs and guide grooves are provided between the outer circular surface of the outlet pipe and the inner hole wall of the sleeve on the left side of the sealing ring.
[0009] Compared with existing technologies, this utility model has the following advantages: a tapered valve core is welded to the inner wall of the valve body outlet flow channel via guide vanes on its back, dividing the fluid into multiple flow channels and reducing fluid vortexes. A pressure-reducing shroud is provided at the valve body outlet, allowing the fluid to diffuse at a wide conical angle into the shroud's annular flow channel, where it is fully mixed with air before passing through multi-stage pressure-reducing orifices for multi-stage pressure reduction and energy dissipation, thereby reducing fluid energy. This design offers advantages such as excellent energy dissipation, minimal cavitation and vibration, and low noise, significantly reducing the construction cost of outlet energy dissipation pools or spillways. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural diagram of the present utility model.
[0011] Figure 2 This utility model Figure 1 Schematic diagram of the connection structure between the transmission assembly and the sleeve.
[0012] In the figure: 1 buried pipeline, 2 outlet pipeline, 3 sleeve, 4 guide vane, 5 annular flow channel, 6 conical valve core, 7 rubber sealing ring, 8 pressure plate, 9 first pressure reducing orifice plate, 10 second pressure reducing orifice plate, 11 pressure reducing guide cover, 12 flow window, 13 sealing ring, 14 guide groove, 15 axial guide rib, 16 main bevel gear transmission device, 17 first sub-bevel gear transmission device, 18 second sub-bevel gear transmission device, 19 transmission rod, 20 screw rod, 21 transmission block. DETAILED DESCRIPTION
[0013] like Figure 1 The multi-stage pressure-reducing intelligent silencer conical regulating valve shown in the figure includes a valve body, a valve core, an opening and closing assembly, a transmission assembly and an actuator. The valve body adopts a circular tube structure, which is composed of a buried pipeline 1 and an outlet pipeline 2 connected by a flange. The inlet end of the buried pipeline 1 is connected to the system pipeline. The valve core adopts a conical valve core 6, and a valve core sealing surface is provided on the outer circumferential surface of the conical valve core 6 at the maximum diameter. The valve is characterized in that: a plurality of guide vanes 4 are evenly arranged in the circumferential direction on one side of the conical surface of the conical valve core 6, and each guide vane 4 is circumferentially spaced from the center line diameter of the conical valve core 6. The outer end face of the guide blade 4 is welded to the inner wall of the outlet pipe 2, and the conical valve core 6 is fixedly connected to the outlet side of the outlet pipe 2, and the inner channel of the outlet pipe 2 is isolated into multiple fan-shaped flow channels along the circumferential direction to reduce fluid vortex, cavitation and vibration. There is an axial spacing between the right end face of the outlet pipe 2 and the valve core sealing surface. The axial spacing and the guide blade 4 form a number of flow windows 12. When the valve is opened, the fluid flows from the flow window 12 along the conical valve. The conical surface of the core 6 forms a trumpet-shaped jet fluid, which makes the fluid diffuse and aerate in the air to achieve the energy dissipation requirement; the opening and closing component is composed of a sleeve 3 set on the outer circumference of the outlet pipe 2 for dynamic sealing, and the outer circumference of the sleeve 3 is connected to the actuator through a transmission component. The end face of the sleeve 3 close to the valve core sealing surface is provided with a sealing surface that cooperates with the valve core sealing surface. The actuator drives the sleeve 3 to move axially through the transmission component to realize the opening and closing control of the valve and the regulation of the discharge flow; a pressure reducing guide cover 11 is set on the outer circumference of the outlet pipe The left end of the pressure reducing shroud 11 is fixedly connected to the buried pipeline 1 through a flange. An annular flow channel 5 is formed between the inner wall of the pressure reducing shroud 11 and the circulation window 12. Several pressure reducing orifices are axially arranged in the pressure reducing shroud 11. The pressure reducing orifices are composed of a first-stage pressure reducing orifice 9 and a second-stage pressure reducing orifice 10. After the fluid is decompressed and energy-dissipated in the annular flow channel 5, it is decompressed again through the first-stage pressure reducing orifice 9 and the second-stage pressure reducing orifice 10, thereby reducing the pressure and energy of the outlet fluid and lowering the impact resistance requirements for the outlet side energy dissipation pool or flood discharge channel. An air supply device is provided on the pressure reducing shroud 11 outside the annular flow channel 5. The air supply device is composed of a ball valve and a one-way valve. When the valve is opened for discharge, the ball valve is first opened to inhale air into the annular flow channel 5 to eliminate the negative pressure inside the pressure reducing shroud 11.
[0014] like Figure 2As shown, the transmission assembly consists of a main bevel gear transmission device 16 and a first sub-bevel gear transmission device 17 and a second sub-bevel gear transmission device 18 symmetrically arranged on both sides of the valve body; the main bevel gear transmission device 16 consists of a driving gear, a first driven gear, and a second driven gear, and the driving gear and the first driven gear and the second driven gear are meshed with each other using bevel gears; the first sub-bevel gear transmission device 17 consists of a first driving bevel gear and a first driven bevel gear, and the second sub-bevel gear transmission device 18 consists of a second driving bevel gear and a second driven bevel gear; the gear boxes of the main bevel gear transmission device 16, the first sub-bevel gear transmission device 17, and the second sub-bevel gear transmission device 18 are fixedly mounted on the outer circumference of the buried pipeline 1, and the three form an isosceles triangle structure. The first sub-bevel gear transmission device 17 and the second sub-bevel gear transmission device 18 are located at both ends of the diameter of the buried pipeline 1; the driving gear is fixedly connected to the transmission shaft of the actuator, and the transmission shaft of the actuator is connected to the transmission shaft of the actuator. The shaft drives the driving gear to rotate, and the first driven gear and the second driven gear are respectively connected to the first driving bevel gear and the second driving bevel gear through the transmission rod 19, and the first driven gear and the second driven gear drive the first driving bevel gear of the first sub-bevel gear transmission device 17 and the second driving bevel gear of the second sub-bevel gear transmission device 18 to rotate through the transmission rod 19; the first driven bevel gear of the first sub-bevel gear transmission device 17 is meshed with the first driving bevel gear, and the second driven bevel gear of the second sub-bevel gear transmission device 18 is meshed with the second driving bevel gear, and the first driven bevel gear and the second driven bevel gear are respectively connected to the screw holes of the transmission blocks 21 provided on both sides of the outer circumference of the sleeve 3 through the screw 20. When the first driven bevel gear and the second driven bevel gear rotate, the screw 20 is driven to rotate, and the transmission block 21 moves axially on the screw 20, driving the sleeve 3 to move axially on the outer circumference of the outlet pipe 2, thereby realizing the opening, closing or opening adjustment of the valve.
[0015] The valve core sealing surface is composed of a metal sealing surface on the radial outer surface of the conical valve core 6 and a fluoroplastic sealing ring 7. The fluoroplastic sealing ring 7 is fixedly mounted on the annular step at the right end of the conical valve core 6 by a pressure plate 8. The metal sealing surface and the fluoroplastic sealing ring 7 cooperate with the sealing surface of the sleeve 3 to form a double sealing structure.
[0016] A sealing ring 13 is provided on the outer cylindrical surface of the right end of the outlet pipe 2 to dynamically seal with the inner hole wall of the sleeve 3. The sealing ring 13 is composed of fluoroplastic sealing rings arranged on both sides of a metal sealing ring. Axial guide ribs 15 and guide grooves 14 that cooperate with each other are provided between the outer cylindrical surface of the outlet pipe 2 and the inner hole wall of the sleeve 3 on the left side of the sealing ring 13. The axial guide rib 15 has a plurality of circumferential directions uniformly arranged on the inner hole wall of the sleeve 3. The axial guide rib 15 moves in the guide groove 14 on the outer circumference of the outlet pipe 2 to achieve axial movement guiding and movement limiting effects on the sleeve 3.
[0017] Directional words such as “left” and “right” in the present invention are only for directions in the drawings for the convenience of description and should not be understood as limiting the present invention.
Claims
1. A multi-stage pressure-reducing intelligent muffler conical regulating valve, comprising a valve body, a valve core, an opening and closing assembly, a transmission assembly and an actuator, wherein the valve body is composed of a buried pipeline (1) and an outlet pipeline (2) connected by a flange, the inlet end of the buried pipeline (1) is connected to the system pipeline, the valve core adopts a conical valve core (6), and a valve core sealing surface is provided on the outer circumference of the conical valve core (6) at the maximum diameter; the valve core is characterized by: A plurality of guide vanes (4) are evenly arranged in the circumferential direction on one side of the conical surface of the conical valve core (6), and a fan-shaped flow channel is formed between adjacent guide vanes (4). The outer end surface of the guide vane (4) is welded to the inner wall of the outlet pipe (2), and an axial spacing is provided between the right end surface of the outlet pipe (2) and the valve core sealing surface. The axial spacing and the guide vane (4) form a plurality of flow windows (12); the opening and closing component is composed of a sleeve (3) provided on the outer circumference of the outlet pipe (2) for dynamic sealing, the outer circumference of the sleeve (3) is connected to the actuator through a transmission component, and a sealing surface that cooperates with the valve core sealing surface is provided on the end surface of the sleeve (3) close to the valve core sealing surface; a pressure reducing guide cover (11) is provided on the outer circumference of the outlet pipe (2), and an annular flow channel (5) is formed between the inner wall of the pressure reducing guide cover (11) and the flow window (12), and a plurality of pressure reducing orifice plates are axially arranged in the pressure reducing guide cover (11).
2. The multi-stage pressure reducing intelligent silencer conical regulating valve according to claim 1 is characterized by: The transmission assembly is composed of a main bevel gear transmission device (16) and a first sub-bevel gear transmission device (17) and a second sub-bevel gear transmission device (18) symmetrically arranged on both sides of the valve body; the main bevel gear transmission device (16) is composed of a driving gear, a first driven gear, and a second driven gear, and the driving gear and the first driven gear and the second driven gear are meshed with each other using bevel gears; the first sub-bevel gear transmission device (17) is composed of a first driving bevel gear and a first driven bevel gear, and the second sub-bevel gear transmission device (18) is composed of a second driving bevel gear and a second driven bevel gear; the driving gear is fixedly connected to the transmission shaft of the actuator, and the first driven gear and the second driven gear are respectively connected to the first driving bevel gear and the second driving bevel gear through a transmission rod (19); The first driven bevel gear and the first active bevel gear are meshed with each other, and the second driven bevel gear and the second active bevel gear are meshed with each other. The first driven bevel gear and the second driven bevel gear are respectively connected to the screw holes of the transmission blocks (21) arranged on both sides of the outer circumference of the sleeve (3) through the screw rod (20).
3. The multi-stage pressure reducing intelligent silencer conical regulating valve according to claim 1 or 2 is characterized in that: The valve core sealing surface is composed of a metal sealing surface on the radial outer surface of the conical valve core (6) and a fluoroplastic sealing ring (7). The fluoroplastic sealing ring (7) is fixedly mounted on the annular step at the right end of the conical valve core (6) by a pressure plate (8).
4. The multi-stage pressure reducing intelligent silencer conical regulating valve according to claim 1 or 2 is characterized in that: A sealing ring (13) is provided on the outer cylindrical surface of the right end of the outlet pipe (2) to dynamically seal with the inner hole wall of the sleeve (3), and an axial guide rib (15) and a guide groove (14) that cooperate with each other are provided between the outer cylindrical surface of the outlet pipe (2) and the inner hole wall of the sleeve (3) on the left side of the sealing ring (13).