Mixed-flow water turbine of hydroelectric power plant

Abstract

The utility model discloses a mixed-flow water turbine of a hydroelectric power station, which comprises a mixed-flow water turbine main body used for hydroelectric power generation operation in the hydroelectric power station; a water inlet pipe of the mixed-flow water turbine body is fixedly communicated with the water outlet end of an acceleration structure through two connecting flanges and connecting bolts, the acceleration structure comprises a booster pump, the water outlet end of the booster pump is fixedly communicated with the water inlet end of an acceleration pipeline, and a gradually-decreasing channel is formed in the acceleration pipeline. According to the mixed-flow water turbine of the hydroelectric power station, the acceleration structure is arranged, filtered water flow is subjected to primary acceleration through the booster pump, the water flow subjected to primary acceleration enters the acceleration pipeline, and the gradually-decreased channel and the acceleration ring in the acceleration pipeline are used for performing secondary acceleration on the water flow subjected to primary acceleration; the impact of water flow on guide vanes in the mixed-flow water turbine body is improved, and then the power generation effect of the mixed-flow water turbine body is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydroelectric power stations, in particular to a mixed flow turbine of a hydroelectric power station. Background Art

[0002] A hydroelectric power station is a power station that uses the kinetic energy of a strong water flow generated by a water level difference to generate electricity. It is referred to as a "hydropower station". It is an industrial enterprise that uses the water energy of a river to drive a turbine to drive a generator set to generate electricity. In a hydroelectric power station, a mixed flow turbine is often used for power generation.

[0003] The Francis turbine has a compact structure, high efficiency, and can adapt to a wide range of water heads. It is one of the turbine types currently widely used in countries around the world. When water flows through the turbine wheel, it enters radially and flows out axially, so it is also called a radial axial flow turbine.

[0004] However, the Francis turbines in current hydroelectric power stations have the following defects:

[0005] Firstly, in order to prevent debris from entering the mixed flow turbine with the water flow and damaging its internal guide vanes, the current mixed flow turbine will set a filtering structure at the water inlet pipe to filter the debris in the water flow, but the filtering structure will reduce the water flow velocity when filtering the flowing water, reduce the impact of the water flow on the guide vanes inside the mixed flow turbine, and thus affect the power generation effect of the mixed flow turbine; secondly, at the same time, the filtering structure currently set at the water inlet pipe of the mixed flow turbine is fixed, which is inconvenient to disassemble, resulting in inconvenient maintenance of the filtering structure, and the mesh of the filter in the filtering structure will be clogged by debris after long-term use, thereby affecting the water intake of the mixed flow turbine. Utility Model Content

[0006] The purpose of the utility model is to provide a mixed flow turbine for a hydroelectric power station, so as to solve the problem proposed in the above background technology that the filtering structure of the current mixed flow turbine will reduce the water flow velocity when filtering the flowing water, reduce the impact of the water flow on the guide vanes inside the mixed flow turbine, and thus affect the power generation effect of the mixed flow turbine.

[0007] To achieve the above object, the utility model provides the following technical solution: a Francis turbine of a hydroelectric power station, comprising:

[0008] Francis turbine body, used in hydroelectric power station for hydroelectric power generation operation;

[0009] The water inlet pipe of the Francis turbine body is fixedly connected to the water outlet end of the acceleration structure through two connecting flanges and connecting bolts, and a sealing gasket is arranged between adjacent connecting flanges;

[0010] The acceleration structure includes a booster pump, a water outlet end of the booster pump is fixedly connected to a water inlet end of a speed-increasing pipe, a gradually decreasing channel is provided inside the speed-increasing pipe, three acceleration rings with gradually decreasing diameters are arranged on the inner wall of the gradually decreasing channel in sequence from left to right, and an anti-slip pad is fixedly provided at the bottom end of the booster pump.

[0011] As a preferred technical solution of the utility model, the water inlet end of the booster pump is fixedly connected to the water outlet end of the temporary water storage tank through one of the transmission pipes, and the water inlet end of the temporary water storage tank is fixedly connected to the water outlet end of another transmission pipe.

[0012] As a preferred technical solution of the utility model, an inlet and outlet groove is provided on the top of the front side of the temporary water storage tank, and the interior of the inlet and outlet groove is communicated with the water storage cavity of the temporary water storage tank. The front side of the inlet and outlet groove is slidably connected with the front side of the detachable filtering structure.

[0013] As a preferred technical solution of the utility model, the detachable filtering structure includes a fixed frame, and connecting grooves are provided in the middle and both ends of the inner walls on both sides of the fixed frame, one end of the six connecting grooves are respectively slidably connected to one end of twelve connecting sliders, and one side of the twelve connecting sliders are respectively fixedly connected to the middle and both ends of both sides of the second filter net and the middle and both ends of both sides of the first filter net.

[0014] As a preferred technical solution of the utility model, limiting sliders are fixedly provided on the tops of both sides of the fixed frame, one end of the two limiting sliders are respectively slidably connected to one end of the two limiting slide grooves, and the two limiting slide grooves are respectively provided on the tops of the inner walls on both sides of the entrance and exit grooves.

[0015] As a preferred technical solution of the utility model, a speed-increasing switch is provided on one side of the Francis turbine body, and the booster pump is electrically connected to the output end of the Francis turbine body power generation structure through the speed-increasing switch.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. By setting up an acceleration structure, the filtered water flow passes through a booster pump for a first acceleration, and the water flow after the first acceleration enters the acceleration pipe. The gradually decreasing channel and the acceleration ring in the acceleration pipe accelerate the water flow after the first acceleration for a second time, so as to increase the impact of the water flow on the guide vanes in the main body of the Francis turbine, thereby effectively improving the power generation effect of the main body of the Francis turbine.

[0018] 2. By setting the entry and exit slots, the limiting slide grooves and the detachable filter structure, the entry and exit slots and the limiting slide grooves can make the detachable filter structure easily slide out of the temporary water storage tank. At the same time, the first filter screen and the second filter screen can be easily taken out from the fixed frame through the connecting slide grooves and the connecting slider, so that the first filter screen and the second filter screen can be convenient for later maintenance, thereby preventing the first filter screen and the second filter screen from being blocked and affecting the water intake of the mixed flow turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the acceleration structure of the utility model;

[0021] Figure 3 It is an exploded view of the detachable filtering structure of the utility model.

[0022] In the figure: 1. Mixed flow turbine body; 2. Connecting flange; 3. Sealing gasket; 4. Accelerating structure; 5. Temporary water storage tank; 6. Inlet and outlet slots; 7. Removable filtering structure; 8. Limiting slide; 9. Transmission pipeline; 10. Speed ​​increasing pipeline; 11. Booster pump; 12. Gradually decreasing channel; 13. Accelerating ring; 14. Anti-skid pad; 15. Fixed frame; 16. Limiting slider; 17. Connecting slide; 18. Connecting slider; 19. First filter screen; 20. Second filter screen. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-3 The utility model provides a technical solution for a mixed flow turbine of a hydroelectric power station:

[0025] Embodiment 1:

[0026] according to Figure 1 and Figure 2As shown, it includes: a mixed flow turbine body 1, which is used for hydroelectric power generation operation in a hydroelectric power station; the water inlet pipe of the mixed flow turbine body 1 is fixedly connected with the water outlet end of the acceleration structure 4 through two connecting flanges 2 and connecting bolts, and a sealing gasket 3 is arranged between adjacent connecting flanges 2, and the sealing gasket 3 can strengthen the sealing between the connecting flanges 2 to prevent water from flowing out from between the connecting flanges 2, and the acceleration structure 4 includes a booster pump 11, and the water outlet end of the booster pump 11 is fixedly connected with the water inlet end of the speed-increasing pipe 10, and the interior of the speed-increasing pipe 10 is provided with a gradually decreasing channel 12, and the inner wall of the gradually decreasing channel 12 is sequentially provided with three gradually decreasing diameter speed-increasing pipes 10 from left to right. The filtered water flow passes through the booster pump 11 for a speed increase, and the water flow after the first speed increase enters the speed increase pipe 10. The gradually decreasing channel 12 and the acceleration ring 13 in the speed increase pipe 10 perform a second speed increase on the water flow after the first speed increase, so as to increase the impact of the water flow on the guide vanes in the mixed flow turbine body 1, thereby effectively improving the power generation effect of the mixed flow turbine body 1. An anti-skid pad 14 is fixedly provided at the bottom end of the booster pump 11, and the anti-skid pad 14 can improve the anti-skid stability of the booster pump 11. A speed increase switch is provided on one side of the mixed flow turbine body 1, and the booster pump 11 is electrically connected to the output end of the power generation structure of the mixed flow turbine body 1 through the speed increase switch.

[0027] When in use, the filtered water flows through the transmission pipe 9 into the booster pump 11, and the booster pump 11 performs a boosting operation on the water flow entering the inside. The boosted water flow is then discharged into the speed increasing pipe 10 by the booster pump 11. The gradually decreasing channel 12 and the acceleration ring 13 in the speed increasing pipe 10 accelerate the pressurized water flow. The accelerated water flow finally enters the inside of the mixed flow turbine body 1 and impacts the guide vanes inside the mixed flow turbine body 1, so that the mixed flow turbine body 1 generates electricity.

[0028] Embodiment 2:

[0029] Based on the first embodiment, according to Figure 1 and Figure 3As shown, the water inlet end of the booster pump 11 is fixedly connected with the water outlet end of the temporary water storage tank 5 through one of the transmission pipes 9, and the water inlet end of the temporary water storage tank 5 is fixedly connected with the water outlet end of another transmission pipe 9, and the water flows into the temporary water storage tank 5 through the transmission pipe 9. The top of the front of the temporary water storage tank 5 is provided with an inlet and outlet groove 6, and the interior of the inlet and outlet groove 6 is connected with the water storage cavity of the temporary water storage tank 5. The front of the inlet and outlet groove 6 is slidably connected with the front of the detachable filter structure 7. The inlet and outlet groove 6 and the limiting slide groove 8 can make the detachable filter structure 7 easily slide out of the temporary water storage tank 5. The detachable filter structure 7 includes a fixed frame 15, and the middle and both ends of the inner walls on both sides of the fixed frame 15 are provided with connecting slide grooves 17, and one end of the six connecting slide grooves 17 is respectively connected to twelve One end of the connecting slider 18 is slidably connected, and one side of the twelve connecting sliders 18 is fixedly connected to the middle and both ends of the second filter screen 20 and the middle and both ends of the first filter screen 19 respectively. The first filter screen 19 and the second filter screen 20 can be easily taken out from the fixed frame 15 through the connecting slide 17 and the connecting slider 18, so that the first filter screen 19 and the second filter screen 20 can be convenient for later maintenance, thereby preventing the first filter screen 19 and the second filter screen 20 from being blocked and affecting the water intake of the mixed flow turbine body 1. Limiting sliders 16 are fixedly provided on the top of both sides of the fixed frame 15, and one end of the two limiting sliders 16 is slidably connected to one end of the two limiting slide grooves 8 respectively, and the two limiting slide grooves 8 are respectively arranged on the top of the inner walls on both sides of the inlet and outlet grooves 6.

[0030] During use, water flows into the temporary water storage tank 5 through the transmission pipe 9, and the water flowing into the temporary water storage tank 5 will fall into the fixed frame 15. At this time, the first filter screen 19 and the second filter screen 20 in the fixed frame 15 perform double filtration on the water flow, and the filtered water flows into the booster pump 11 through the transmission pipe 9. After the first filter screen 19 and the second filter screen 20 have been used for a period of time, the entire detachable filter structure 7 is pulled out of the temporary water storage tank 5 through the access groove 6 and the limiting slide groove 8, and then the first filter screen 19 and the second filter screen 20 are lifted from the bottom of the fixed frame 15 to disengage the connecting slider 18 from the connecting slide groove 17, so as to take the first filter screen 19 and the second filter screen 20 out of the fixed frame 15, and finally the first filter screen 19 and the second filter screen 20 are cleaned.

[0031] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A Francis turbine for a hydroelectric power station, comprising: A Francis turbine body (1) is used for hydroelectric power generation in a hydroelectric power station; The invention is characterized in that the water inlet pipe of the Francis turbine body (1) is fixedly connected to the water outlet end of the acceleration structure (4) through two connecting flanges (2) and connecting bolts, and a sealing gasket (3) is provided between adjacent connecting flanges (2); The acceleration structure (4) comprises a booster pump (11), the water outlet end of the booster pump (11) is fixedly connected to the water inlet end of the speed-increasing pipe (10), a gradually decreasing channel (12) is provided inside the speed-increasing pipe (10), three acceleration rings (13) with gradually decreasing diameters are arranged in sequence from left to right on the inner wall of the gradually decreasing channel (12), and an anti-slip pad (14) is fixedly arranged at the bottom end of the booster pump (11).

2. A Francis turbine for a hydroelectric power station according to claim 1, characterized in that: The water inlet end of the booster pump (11) is fixedly connected to the water outlet end of the temporary water storage tank (5) through one of the transmission pipes (9), and the water inlet end of the temporary water storage tank (5) is fixedly connected to the water outlet end of another transmission pipe (9).

3. A Francis turbine for a hydroelectric power station according to claim 2, characterized in that: The top of the front side of the temporary water storage tank (5) is provided with an inlet and outlet slot (6), and the interior of the inlet and outlet slot (6) is communicated with the water storage chamber of the temporary water storage tank (5), and the front side of the inlet and outlet slot (6) is slidably connected with the front side of the detachable filtering structure (7).

4. A Francis turbine for a hydroelectric power station according to claim 3, characterized in that: The detachable filtering structure (7) comprises a fixed frame (15), and connecting grooves (17) are provided in the middle and both ends of the inner walls on both sides of the fixed frame (15), one end of the six connecting grooves (17) is respectively slidably connected to one end of twelve connecting slide blocks (18), and one side of the twelve connecting slide blocks (18) is respectively fixedly connected to the middle and both ends of both sides of the second filter screen (20) and the middle and both ends of both sides of the first filter screen (19).

5. A Francis turbine for a hydroelectric power station according to claim 4, characterized in that: Limiting slide blocks (16) are fixedly arranged at the top of both sides of the fixed frame (15), one end of the two limiting slide blocks (16) is slidably connected to one end of two limiting slide grooves (8), and the two limiting slide grooves (8) are respectively arranged at the top of the inner walls on both sides of the entry and exit slots (6).

6. The Francis turbine of a hydroelectric power station according to claim 1, characterized in that: A speed-increasing switch is provided on one side of the Francis turbine body (1), and the booster pump (11) is electrically connected to the output end of the power generation structure of the Francis turbine body (1) via the speed-increasing switch.

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