Drainage device for volute of water turbine

Abstract

A water drainage device for a water turbine volute comprises a push-pull device and a valve plate, the push-pull device is located below a water drainage hole of the water turbine volute, the water turbine volute is connected with a water drainage pipe on the lower side of the water drainage hole, a telescopic rod of the push-pull device extends upwards to penetrate through the water drainage pipe and the water drainage hole, and the valve plate is connected to the top of the telescopic rod; the telescopic rod is a hollow pipe body, a plurality of water spraying holes are formed in the upper end of the telescopic rod, and a connector is arranged at the lower end of the telescopic rod. A telescopic rod of the push-pull device is a hollow pipe body, a plurality of water spraying holes are formed in the upper end of the telescopic rod, and high-pressure water sprayed out of the water spraying holes is used for backflushing the drainage holes, so that sundries on the periphery of the drainage holes are removed, and the valve plate can seal the drainage holes.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine volute drainage, in particular to a drainage device for a water turbine volute. Background Art

[0002] A hydro-turbine generator is referred to as a water turbine. A disc valve is installed at the bottom of the volute of the hydro-turbine generator. When the disc valve is opened, the volute starts to drain water; when the disc valve is closed, the volute stops draining water.

[0003] During the drainage process of hydropower station units, a common problem is that 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, causing the valve disc to not fit tightly, thus causing continuous leakage. When the unit is running, this leakage not only increases the workload of the drainage pump, causing it to start and stop frequently, but also affects the stability of the water flow in the entire volute flow channel, aggravating the vibration of the unit, which may pose a serious threat to the safe and stable operation of the unit. Manually handling these stuck foreign objects requires unit drainage operations, which will occupy the unit maintenance period. Therefore, it is particularly necessary to study and develop a turbine volute drainage device that can prevent foreign objects from getting stuck. Utility Model Content

[0004] The utility model aims to provide a drainage device for a turbine volute, wherein the telescopic rod of the push-pull device is a hollow tube, and a plurality of water spray holes are arranged on the upper end of the telescopic rod, and the drainage holes are backwashed by high-pressure water sprayed from the water spray holes, thereby removing debris around the drainage holes and enabling the valve plate to close the drainage holes.

[0005] To achieve the above-mentioned purpose, the utility model provides a drainage device for a turbine volute, comprising a push-pull device and a valve plate, wherein the push-pull device is located below the drainage hole of the turbine volute, the turbine volute is connected to a drainage pipe at the lower side of the drainage hole, the telescopic rod of the push-pull device extends upward through the drainage pipe and the drainage hole, and the valve plate is connected to the top of the telescopic rod; the telescopic rod is a hollow tube body, a plurality of water spray holes are arranged at the upper end of the telescopic rod, and a joint is arranged at the lower end of the telescopic rod.

[0006] The push-pull device is a pneumatic cylinder, an oil cylinder or a screw lift.

[0007] The push-pull device is installed on a support.

[0008] The joint is provided with a water pump via a pipeline.

[0009] A valve is installed at the lower end of the telescopic rod or on the pipeline.

[0010] A support ring with a conical lower portion is fixedly installed on the lower side of the valve plate. The support ring is connected and fixed to the telescopic rod, and a plurality of recoil holes are arranged on the support ring.

[0011] A piston cavity is arranged inside the upper end of the telescopic rod, a piston and a spring are installed in the piston cavity, one end of the spring abuts against the valve plate, and the other end abuts against the piston.

[0012] The drain pipe is also provided with a sealing device, which is used for slidingly sealing the drain pipe and the telescopic rod.

[0013] The sealing device includes a sealing sleeve, a sealing member and a pressure ring. The sealing sleeve is installed on the drain pipe. The telescopic rod passes through the sealing sleeve. An annular groove is provided in the sealing sleeve. The sealing member is installed in the annular groove. The pressure ring is installed on the sealing sleeve by bolts. The 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. The telescopic rod of the push-pull device of the utility model is a hollow tube body, and a plurality of water spray holes are arranged on the upper end of the telescopic rod. The high-pressure water sprayed from the water spray holes is used to backwash the drainage holes, thereby removing the debris around the drainage holes, so that the valve plate can close the drainage holes.

[0016] 2. A support ring with a conical lower part is fixedly installed on the lower side of the valve plate of the utility model. The support ring is connected and fixed to the telescopic rod, and a plurality of recoil holes are arranged on the support ring. The support ring has two functions: one is to guide and limit the valve plate so that the valve plate is aligned with the drain hole when closed; the other is that the outer circumference of the support ring is closer to the drain hole, and a plurality of recoil holes are arranged on the support ring, so that the water flow can recoil the drain hole more forcefully.

[0017] 3. The drain pipe of the utility model is also equipped with a sealing device, which is used to slide and seal the drain pipe and the telescopic rod, and is also used to support and guide 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 plate is opened.

[0020] Figure 2 for 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 plate is closed.

[0023] In the figure:

[0024] Turbine volute 10, drainage hole 11;

[0025] Drain pipe 20, longitudinal section 21, horizontal section 22;

[0026] Push-pull device 30, telescopic rod 31, piston chamber 32, piston 33, spring 34, water spray hole 35, joint 36;

[0027] Valve plate 40 , support ring 41 , back-flushing hole 42 .

[0028] Sealing device 50, sealing sleeve 51, annular groove 52, sealing member 53, pressure ring 54, flange 541;

[0029] Support 60;

[0030] Hydraulic system or air compressor 70;

[0031] Water pump 80, valve 81. DETAILED DESCRIPTION

[0032] 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.

[0033] See also Figure 1-4 A drainage device for a turbine volute includes a push-pull device 30 and a valve plate 40. The push-pull device 30 is located below the drainage hole 11 of the turbine volute 10. The turbine volute 10 is connected to a drainage pipe 20 at the lower side of the drainage hole 11. The telescopic rod 31 of the push-pull device 30 extends upward through the drainage pipe 20 and the drainage hole 11. The valve plate 40 is connected to the top of the telescopic rod 31. The telescopic rod 31 is a hollow tube body. A plurality of water spray holes 35 are arranged at the upper end of the telescopic rod 31. A joint 36 is arranged at the lower end of the telescopic rod 31. The telescopic rod 31 of the push-pull device 30 is a hollow tube body. A plurality of water spray holes 35 are arranged at the upper end of the telescopic rod 31. The drainage hole 11 is backwashed by high-pressure water sprayed from the water spray holes 35, thereby clearing the debris around the drainage hole 11, so that the valve plate 40 can close the drainage hole.

[0034] Specifically, the push-pull device 30 is a gas cylinder or oil cylinder or a screw lift. When the push-pull device 30 is an oil cylinder or a gas cylinder, the piston rod is a telescopic rod 31, and both ends of the piston rod extend out of the cylinder body, and the push-pull device 30 is connected to the hydraulic system or the air compressor 70 through a pipeline. When the push-pull device 30 is a screw lift, the central screw of the screw lift is a telescopic rod 32.

[0035] Further, the push-pull device 30 is installed on a support 60, and the support 60 is installed on the ground, and the push-pull device 30 is supported and fixed by the support 60. The support 60 is a steel structure.

[0036] See also Figure 1 The joint 36 is provided with a water pump 80 through a pipeline, and water is supplied to the telescopic rod 31 through the water pump 80. The water pump 80 is a high-pressure water pump. The pipeline adopts a hose, or a part is a steel pipe and the other part is a hose.

[0037] Further, a valve 81 is installed at the lower end of the telescopic rod 31 or on the pipeline. The telescopic rod 31 is closed by the valve 81 to prevent the water in the volute from flowing out of the telescopic rod 31.

[0038] See also Figure 1 , 2 A support ring 41 with a conical lower portion is fixedly installed on the lower side of the valve plate 40. The support ring 41 is connected and fixed to the telescopic rod 31, and a plurality of recoil holes 42 are arranged on the support ring 41. The support ring 41 has two functions: one is to guide and limit the valve plate 40 so that the valve plate is aligned with the drain hole 11 when closed; the other is to make the outer circumference of the support ring 41 closer to the drain hole 11. The plurality of recoil holes 42 arranged on the support ring 41 can make the water flow recoil the drain hole 11 more effectively.

[0039] Specifically, the upper end of the support ring 41 is a circular ring, and the lower end is a cone structure, and a plurality of recoil holes 42 surround the circular ring arranged on the upper end.

[0040] See also Figure 2 The upper end of the telescopic rod 31 is provided with a piston chamber 32, in which a piston 33 and a spring 34 are installed, one end of the spring 34 abuts against the valve plate 40, and the other end abuts against the piston 33. Through the above structure, a one-way valve is formed, which can also prevent the water in the volute from flowing out of the telescopic rod 31.

[0041] See also Figure 1 A sealing device 50 is also installed on the drain pipe 20. The sealing device 50 is used to slide and seal the drain pipe 20 and the telescopic rod 31, and is also used to support and guide the telescopic rod 31.

[0042] For details, see Figure 3The sealing device 50 includes a sealing sleeve 51, a sealing member 53 and a pressing ring 54. The sealing sleeve 51 is installed on the drain pipe 20. The telescopic rod 31 passes through the sealing sleeve 51. The sealing sleeve 51 is provided with an annular groove 52. The sealing member 53 is installed in the annular groove 52. The pressing ring 54 is installed on the sealing sleeve 51 through bolts 55. The flange 541 on one side of the inner hole of the pressing ring 54 extends into the annular groove 52 and abuts against the sealing member 53. The sealing member 53 can be a skeleton seal, and the skeleton seal is fixed by the pressing ring 54; the sealing member 53 can also be a packing used on a water pump, and the packing is compressed by the flange 541 on the pressing ring 54, and the packing can also be compressed by bolts 55 after water leakage.

[0043] The working principle or action process of the utility model is as follows:

[0044] See also Figure 1 At this time, the valve plate 40 is in a closed state. When the valve plate 40 needs to be opened, the telescopic rod 31 of the push-pull device 30 is driven to move upward. At this time, the valve plate 40 is opened, and the water in the volute can be discharged through the drain pipe 20.

[0045] When the valve plate 40 needs to be closed, the water pump 80 is turned on, the valve 81 is opened, and the high-pressure water enters the telescopic rod 31 through the pipeline, enters the cavity of the support ring 41 from the water spray hole 35 at the top of the telescopic rod 31, and finally the high-pressure water is sprayed out from the backwash hole 42 arranged around the support ring 41. Then the telescopic rod 31 of the push-pull device 30 is driven to move downward, and at this time the valve plate 40 gradually moves downward and closes. During the closing process, the high-pressure water sprayed from the backwash hole 42 backwashes the surrounding area of ​​the drainage hole 11, thereby preventing the valve plate 40 from being blocked.

Claims

1. A drainage device for a turbine volute, characterized in that: The invention comprises a push-pull device (30) and a valve plate (40), wherein the push-pull device (30) is located below a drainage hole (11) of a turbine volute (10), the turbine volute (10) is connected to a drainage pipe (20) at the lower side of the drainage hole (11), a telescopic rod (31) of the push-pull device (30) extends upward through the drainage pipe (20) and the drainage hole (11), and the valve plate (40) is connected to the top of the telescopic rod (31); the telescopic rod (31) is a hollow tube, a plurality of water spray holes (35) are arranged at the upper end of the telescopic rod (31), and a joint (36) is arranged at the lower end of the telescopic rod (31).

2. A drainage device for a turbine volute according to claim 1, characterized in that: The push-pull device (30) is a pneumatic cylinder, an oil cylinder, or a screw lift.

3. A drainage device for a turbine volute according to claim 1 or 2, characterized in that: The push-pull device (30) is installed on a support (60).

4. A drainage device for a turbine volute according to claim 1, characterized in that: The joint (36) is provided with a water pump (80) via a pipeline.

5. A drainage device for a turbine volute according to claim 4, characterized in that: A valve (81) is installed at the lower end of the telescopic rod (31) or on the pipeline.

6. A drainage device for a turbine volute according to claim 1, characterized in that: A support ring (41) with a conical lower portion is fixedly mounted on the lower side of the valve plate (40); the support ring (41) is connected and fixed to the telescopic rod (31); and a plurality of recoil holes (42) are provided on the support ring (41).

7. A drainage device for a turbine volute according to claim 1 or 6, characterized in that: A piston chamber (32) is provided inside the upper end of the telescopic rod (31), a piston (33) and a spring (34) are installed in the piston chamber (32), one end of the spring (34) abuts against the valve plate (40), and the other end abuts against the piston (33).

8. The drainage device for a turbine volute according to claim 1, characterized in that: A sealing device (50) is also installed on the drainage pipe (20), and the sealing device (50) is used to slide and seal the drainage pipe (20) and the telescopic rod (31).

9. A drainage device for a turbine volute according to claim 8, characterized in that: The sealing device (50) comprises a sealing sleeve (51), a sealing member (53) and a pressing ring (54); the sealing sleeve (51) is mounted on the drain pipe (20); the telescopic rod (31) passes through the sealing sleeve (51); an annular groove (52) is provided in the sealing sleeve (51); the sealing member (53) is mounted in the annular groove (52); the pressing ring (54) is mounted on the sealing sleeve (51) by means of bolts (55); a flange (541) on one side of the inner hole of the pressing ring (54) extends into the annular groove (52) and abuts against the sealing member (53).

Images