Drainage device for draft tube of hydroelectric generating set
By designing a drainage device for the tailpipe of the water-electric unit, high-pressure water flow or air flow backlash to remove debris, the problem of easy jamming of the disc valve and causing water leakage is solved, effectively closing the drain hole, and reducing the work burden of the drain pump.
Patent Information
- Application Number
- CN202421626213.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The disc-shaped valve in the tailpipe of the water turbine generator set is easily stuck by floating objects during use, resulting in the drainage hole being unable to be completely closed, resulting in continuous water leakage and increasing the working burden of the drainage pump.
A drainage device for the tailpipe of the water-electric unit is designed, including a telescopic device and a valve plate. There are flow guide holes in the telescopic rod, and there are multiple flow outlets at the lower end, and the interface is connected to a high-pressure water pump or compressed air source. When the valve disk is closed, high-pressure water or air flow backshots through the discharge hole to remove debris, so that the valve disk can effectively close the drain hole.
Removal of debris by backflushing of high-pressure water or air flow ensures that the valve plate can completely close the drain hole, solves the water leakage problem and reduces the work burden of the drain pump.
Smart Images
Figure CN222759883U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tailwater pipe drainage of a water turbine unit, in particular to a tailwater pipe drainage device for a water turbine unit. Background Art
[0002] The tailwater pipe of the hydro-turbine generator set is provided with a drainage hole, which is connected to the drainage gallery and is equipped with a disc valve. When the disc valve needs to be opened or closed, the disc valve servo piston is pushed up and down by operating the oil pump in a hydraulic manner. The movement of the piston drives the long drive shaft to move, thereby controlling the opening and closing of the valve disc. When the disc valve is opened, the unit starts to drain water; when the disc valve is closed, the unit stops draining water.
[0003] At present, when the disc valve at the tailwater pipe is in use, floating objects are easily stuck on the valve disc of the disc valve. When the disc valve tries to close, these foreign objects will prevent the valve disc from closing completely, resulting in the drainage hole not being completely closed, causing continuous water leakage in the drainage hole, which increases the workload of the drainage pump in the drainage gallery. Utility Model Content
[0004] The utility model aims to provide a drainage device for the tailwater pipe of a hydropower unit, wherein a guide hole is arranged in a telescopic rod of the telescopic device, a plurality of drainage holes are arranged on the telescopic rod below a valve disc, an interface is arranged on the upper end of the telescopic rod, and the interface is connected with a high-pressure water pump or a compressed air source through a pipeline, and when the valve disc is closed, high-pressure water flow or high-pressure air flow is discharged from the drainage hole, and the area around the drainage hole is backwashed to clear the debris around the drainage hole, so that the valve disc can close the drainage hole.
[0005] To achieve the above-mentioned purpose, the utility model provides a drainage device for a tailwater pipe of a hydropower unit, comprising a telescopic device and a valve disc, wherein the telescopic device is located above the tailwater pipe of the turbine unit, a drainage hole is arranged on the lower side of the tailwater pipe, the lower end of a telescopic rod of the telescopic device extends downward through the upper wall of the tailwater pipe and is aligned with the drainage hole, the valve disc is mounted on the lower end of the telescopic rod, a guide hole is arranged inside the telescopic rod, a plurality of drainage holes are arranged on the telescopic rod below the valve disc, and an interface is arranged on the upper end of the telescopic rod.
[0006] The telescopic device is a pneumatic cylinder, an oil cylinder or a screw lift.
[0007] The interface is connected to the pressure supply system through a pipeline.
[0008] It also includes a valve seat, which is installed on the drain hole; the valve seat includes a seat ring, the inner hole of the seat ring is provided with a sealing ring surface, and water sealing is achieved when the outer circumference of the valve disc contacts the sealing ring surface.
[0009] The valve seat also includes an inner ring, an outer ring, a support rod and a bottom ring. The bottom ring is located at the lower side of the seat ring. The outer ring is fixed between the seat ring and the bottom ring. The lower end of the telescopic rod extends downward and slides through the inner ring. The inner ring and the outer ring are connected and fixed by multiple support rods.
[0010] A sealing gasket is installed on the valve disc.
[0011] A connecting sleeve is also arranged at the lower side of the mounting hole of the valve disc, a collecting ring is arranged on the connecting sleeve, the collecting ring corresponds to the position of the discharge hole, and a plurality of recoil holes are arranged on the collecting ring.
[0012] A nozzle is installed on the recoil hole.
[0013] A sealing device is also installed on the inner wall of the tailwater pipe, and the sealing device includes a sealing sleeve, a sealing member and a pressure ring. The sealing sleeve is installed on the inner wall of the tailwater pipe, and the telescopic rod passes through the sealing sleeve. An annular groove is provided in the sealing sleeve, and the sealing member is installed in the annular groove. The pressure ring is installed on the sealing sleeve by bolts, and a flange on one side of the inner hole of the pressure ring extends into the annular groove and abuts against the sealing member.
[0014] Compared with the prior art, the utility model has the following technical effects:
[0015] 1. A guide hole is arranged in the telescopic rod of the telescopic device of the utility model, and a plurality of drainage holes are arranged on the telescopic rod below the valve disc. An interface is arranged on the upper end of the telescopic rod, and the interface is connected with a high-pressure water pump or a compressed air source through a pipeline. When the valve disc moves from top to bottom to close, high-pressure water flow or high-pressure air flow is discharged from the drainage hole, and the area around the drainage hole is recoiled to clear the debris around the drainage hole, so that the valve disc can close the drainage hole.
[0016] 2. The utility model also has a connecting sleeve disposed on the lower side of the mounting hole of the valve disc, and a collecting ring is disposed on the connecting sleeve. The collecting ring corresponds to the position of the drainage hole, and a plurality of recoil holes are evenly distributed in an annular pattern on the collecting ring. This reduces the distance between the recoil hole and the edge of the drainage hole, and the collecting ring has a larger diameter, so more recoil holes can be disposed on the collecting ring.
[0017] 3. The inner wall of the tailwater pipe of the utility model is also equipped with a sealing device, which realizes the sliding sealing between the upper side wall of the tailwater pipe and the telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0019] Figure 1 It is a structural schematic diagram of the utility model when the valve disc is opened.
[0020] Figure 2for Figure 1 Enlarged structural diagram at A in the middle.
[0021] Figure 3 for Figure 1 Enlarged structural diagram at B in the middle.
[0022] Figure 4 It is a structural schematic diagram of the utility model when the valve disc is closed.
[0023] In the figure:
[0024] Tailwater pipe 10, drainage hole 11,
[0025] Valve seat 20, seat ring 21, sealing ring surface 22, inner ring 23, outer ring 24, support rod 25, bottom ring 26;
[0026] Telescopic device 30, telescopic rod 31, guide hole 311, drainage hole 32, interface 33,
[0027] Valve disc 40 , sealing gasket 41 , connecting sleeve 42 , collecting ring 43 , backflushing hole 44 , nozzle 45 .
[0028] Sealing device 50, sealing sleeve 51, annular groove 511, sealing member 52, pressure ring 53, flange 531, bolt 54,
[0029] Pressure supply system 60 , hydraulic system or compressed air system 70 , bracket 80 . DETAILED DESCRIPTION
[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0031] See also Figure 1-4 A drainage device for a tailwater pipe of a hydropower unit includes a telescopic device 30 and a valve disc 40. The telescopic device 30 is located above the tailwater pipe 10 of the turbine unit. A drainage hole 11 is provided at the lower side of the tailwater pipe 10. The lower end of a telescopic rod 31 of the telescopic device 30 extends downward through the upper wall of the tailwater pipe 10 and is aligned with the drainage hole 11. The valve disc 40 is installed at the lower end of the telescopic rod 31. A guide hole 311 is provided inside the telescopic rod 31. The telescopic rod 31 is provided with a plurality of drainage holes 32 below the valve disc 40. An interface 33 is provided at the upper end of the telescopic rod 31.
[0032] See also Figure 2A guide hole 311 is provided in the telescopic rod 31 of the telescopic device 30, and a plurality of drainage holes 32 are provided on the telescopic rod 31 below the valve disc 40. An interface 33 is provided on the upper end of the telescopic rod 31, and the interface 33 is connected to a high-pressure water pump or a compressed air source through a pipeline. When the valve disc 40 moves from top to bottom to close, high-pressure water flow or high-pressure air flow is discharged from the drainage hole 32, and the area around the drainage hole 11 is recoiled to clear the debris around the drainage hole, so that the valve disc 40 can close the drainage hole 11.
[0033] In this embodiment, the upper side of the drain hole 11 is a plane. When the valve disc 40 moves downward, the valve disc 40 covers the plane outside the drain hole 11, thereby closing the drain hole 11.
[0034] Specifically, the telescopic device 30 is a gas cylinder or oil cylinder or a screw lift. When the telescopic device 30 is an oil cylinder or a gas cylinder, the telescopic device 30 is connected to the hydraulic system or the compressed air system 70 through a pipeline, and the piston rod of the oil cylinder or the gas cylinder is the telescopic rod 31; when the telescopic device 30 is a screw lift, the screw lift is driven by a motor, and the main shaft screw of the screw lift is the telescopic rod 31.
[0035] During installation, the telescopic device 30 is installed on a support 80 of the steel structure, and the support 80 is connected and fixed to the ground.
[0036] When using, see Figure 1 , 4 The interface 33 is connected to the pressure supply system 60 through a pipeline. The pressure supply system 60 is a high-pressure water pump or a compressed air source, and the compressed air source can also be an air compressor.
[0037] See also Figure 2 The drainage device of the present application further includes a valve seat 20, which is installed on the drainage hole 11. The valve seat 20 includes a seat ring 21, and the inner hole of the seat ring 21 is provided with a sealing ring surface 22. When the outer circumference of the valve disc 40 contacts the sealing ring surface 22, water sealing is achieved. By providing the valve seat 20, the sealing effect is improved.
[0038] Furthermore, a sealing gasket 41 is installed on the valve disc 40. When the valve disc 40 is closed, the sealing gasket 41 and the sealing ring surface 22 are in close contact and sealed.
[0039] Specifically, in Figure 2 In the embodiment, the sealing ring surface 22 is a conical surface which is larger at the top and smaller at the bottom.
[0040] See also Figure 2The valve seat 20 further includes an inner ring 23, an outer ring 24, a support rod 25 and a bottom ring 26. The bottom ring 26 is located at the lower side of the seat ring 21. The outer ring 24 is fixed between the seat ring 21 and the bottom ring 26. The lower end of the telescopic rod 31 extends downward and slides through the inner ring 23. The inner ring 23 and the outer ring 24 are connected and fixed by a plurality of support rods 25. The telescopic rod 31 is slidably guided and limited by the inner ring 23 to improve the stability of the operation of the telescopic rod 31.
[0041] Continue to see Figure 2 Since the guide hole 311 is far from the edge of the drain hole 11, the energy loss of the water flow or air flow ejected through the guide hole 311 is large. Therefore, a connecting sleeve 42 is also provided on the lower side of the mounting hole of the valve disc 40, and a collecting ring 43 is provided on the connecting sleeve 42. The collecting ring 43 corresponds to the position of the drain hole 32, and a plurality of recoil holes 44 are evenly distributed in an annular manner on the collecting ring 43. In this way, firstly, the distance between the recoil hole 44 and the edge of the drain hole 11 is reduced, and secondly, the collecting ring 43 has a larger diameter, so that more recoil holes 44 can be provided on the collecting ring 43.
[0042] Furthermore, a nozzle 45 is installed on the recoil hole 44 to further reduce the distance from the edge of the drainage hole 11 .
[0043] See also Figure 3 The inner wall of the tailwater pipe 10 is also provided with a sealing device 50. The sealing device 50 is used to achieve sliding sealing between the upper side wall of the tailwater pipe 10 and the telescopic rod 31.
[0044] Specifically, the sealing device 50 includes a sealing sleeve 51, a sealing member 52 and a pressure ring 53. The sealing sleeve 51 is installed on the inner wall of the tailwater pipe 10. The telescopic rod 31 passes through the sealing sleeve 51. The sealing sleeve 51 is provided with an annular groove 511. The sealing member 52 is installed in the annular groove 511. The pressure ring 53 is installed on the sealing sleeve 51 through bolts 54. The flange 531 on one side of the inner hole of the pressure ring 53 extends into the annular groove 511 and abuts against the sealing member 52. The sealing member 52 can be a skeleton seal or a packing used on a water pump. Through the above structure, the telescopic rod 31 can move up and down and can achieve sealing.
[0045] The working principle or action process of the utility model is as follows:
[0046] See also Figure 1 , 2 , this is the state when the valve disc is open. When the valve disc 40 needs to be closed, the telescopic rod 31 of the telescopic device 30 is controlled to extend downward, and while the valve disc 40 moves downward, high-pressure water or compressed air is delivered to the guide hole 311 through the pressure supply system 60, and the high-pressure water or compressed air is sprayed from the nozzle 45 to backwash the area around the drain hole 11, clear the debris around the drain hole, and enable the valve disc 40 to close the drain hole 11.
Claims
1. A drainage device for tailwater pipe of a hydropower unit, characterized by: The invention comprises a telescopic device (30) and a valve disc (40), wherein the telescopic device (30) is located above the tailwater pipe (10) of the turbine unit, a drainage hole (11) is provided at the lower side of the tailwater pipe (10), a lower end of a telescopic rod (31) of the telescopic device (30) extends downward through the upper wall of the tailwater pipe (10) and is aligned with the drainage hole (11), the valve disc (40) is mounted at the lower end of the telescopic rod (31), a guide hole (311) is provided inside the telescopic rod (31), a plurality of drainage holes (32) are provided on the telescopic rod (31) below the valve disc (40), and an interface (33) is provided at the upper end of the telescopic rod (31).
2. A tailwater pipe drainage device for a hydropower unit according to claim 1, characterized in that: The telescopic device (30) is a pneumatic cylinder, an oil cylinder, or a screw lift.
3. The tailwater pipe drainage device for a hydropower unit according to claim 1, characterized in that: The interface (33) is connected to the pressure supply system (60) via a pipeline.
4. The tailwater drainage device for a hydropower unit according to claim 1, characterized in that: It also includes a valve seat (20), which is mounted on the drain hole (11); the valve seat (20) includes a seat ring (21), the inner hole of the seat ring (21) is provided with a sealing ring surface (22), and water sealing is achieved when the outer circumference of the valve disc (40) contacts the sealing ring surface (22).
5. A tailwater pipe drainage device for a hydropower unit according to claim 4, characterized in that: The valve seat (20) further comprises an inner ring (23), an outer ring (24), support rods (25) and a bottom ring (26); the bottom ring (26) is located at the lower side of the seat ring (21); the outer ring (24) is fixed between the seat ring (21) and the bottom ring (26); the lower end of the telescopic rod (31) extends downward and slides through the inner ring (23); the inner ring (23) and the outer ring (24) are connected and fixed by a plurality of support rods (25).
6. A tailwater drainage device for a hydropower unit according to claim 4, characterized in that: A sealing gasket (41) is installed on the valve disc (40).
7. The tailwater drainage device for a hydropower unit according to claim 1, characterized in that: A connecting sleeve (42) is further provided at the lower side of the mounting hole of the valve disc (40), a collecting ring (43) is provided on the connecting sleeve (42), the collecting ring (43) corresponds to the position of the discharge hole (32), and a plurality of backwash holes (44) are provided on the collecting ring (43).
8. The tailwater drainage device for a hydropower unit according to claim 7, characterized in that: A nozzle (45) is installed on the recoil hole (44).
9. The tailwater pipe drainage device for a hydropower unit according to claim 1, characterized in that: A sealing device (50) is also installed on the inner wall of the tailwater pipe (10). The sealing device (50) comprises a sealing sleeve (51), a sealing member (52) and a pressure ring (53). The sealing sleeve (51) is installed on the inner wall of the tailwater pipe (10). The telescopic rod (31) passes through the sealing sleeve (51). An annular groove (511) is provided in the sealing sleeve (51). The sealing member (52) is installed in the annular groove (511). The pressure ring (53) is installed on the sealing sleeve (51) by means of bolts (54). A flange (531) on one side of the inner hole of the pressure ring (53) extends into the annular groove (511) and abuts against the sealing member (52).