CN220378398U - Diagonal flow type water pump turbine - Google Patents

Abstract

The water turbine with inclined flow pump has water inlet pipe connected to the inlet of the spiral casing, fixed guide vanes inside the spiral casing, movable guide vanes inside the spiral casing, rotating wheel inside the spiral casing, and the main shaft with power generating motor. The utility model has novel and unique structure, effectively solves the problems of long construction period, high construction cost and difficult site selection of the pumped storage power station, greatly saves the construction cost and has obvious economic benefit, social benefit, energy conservation and environmental protection benefit.

Description

A diagonal flow water pump turbine

Technical field

The invention relates to the field of hydraulic turbines, in particular to a diagonal flow pump turbine used for converting a conventional hydropower station into a pumped storage power station.

Background technique

At present, the realization of the "double carbon" goal requires vigorous development of clean energy. However, due to the intermittent and unstable nature of clean energy, if clean energy power generation is directly integrated into the power grid, it will have a greater impact on the power grid. For this part of clean energy, we mainly rely on Building supporting energy storage power stations solves the problem. However, the construction of large-scale pumped storage power stations is limited by geographical location, and there are problems such as difficult site selection, long development cycle, and large investment. Currently, the locations of pumped storage power stations that can be developed are limited and the development cycle is long, which is far from meeting the demand for pumped storage power stations in the short term. If conventional power stations can be transformed into pumped-storage power stations without changing infrastructure such as power station dams and workshops, it can not only achieve resource reuse but also promote the development of pumped-storage power stations. Inclined flow pump turbines are suitable for power stations with low water heads and large head fluctuations, and their overall efficiency is high. In order to solve the above problems, if the diagonal flow turbine can be redesigned and improved to make it a diagonal flow pump turbine that can meet the bidirectional operation, the diagonal flow pump turbine can make the water flow state in the pump working condition and the turbine working condition. It's in good condition, but there have been no reports about it so far.

Contents of the invention

In view of the above situation, in order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a diagonal flow pump turbine, which can effectively solve the problems of high construction cost, long construction period and difficult site selection of new pumped storage power stations.

In order to achieve the above object, the technical solution of the present invention is a diagonal flow water pump turbine, which includes an inlet pipe and a draft pipe. The outlet of the inlet pipe is connected with the inlet of the volute, and fixed devices are evenly distributed in the outlet of the volute. Guide vanes, the volute at the outlet of the fixed guide vanes is concentrically equipped with evenly distributed movable guide vanes, and the volute at the outlet of the movable guide vanes is concentrically equipped with a runner. The runner outlet is connected to the draft pipe, and the runner includes alternate openings. The blades, hub, upper ring and lower ring are evenly distributed. The inner side of the blade is connected to the hub, the upper end is connected to the upper ring, and the lower end is connected to the lower ring. The blade exit angle is 21°-23°, and the blade inlet angle is 15°-16°. , the blade wrap angle is 34°-35°, the central axis hole of the runner is connected to the main shaft through a key, and the main shaft extending above the volute is equipped with a generator motor.

The invention has a novel and unique structure, effectively solves the problems of long construction period, high construction cost and difficult site selection of pumped storage power stations, and greatly saves construction costs. It is an innovation in the construction of diagonal flow pumped storage power stations and is also an innovation for conventional diagonal flow. It has provided technical support for the transformation of pumped storage power stations, and has achieved significant economic benefits, social benefits, energy conservation and environmental protection benefits.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a longitudinal sectional schematic diagram of the present invention.

Figure 3 is a schematic structural diagram of the runner of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and specific situations.

Given in conjunction with the accompanying drawings, a diagonal flow water pump turbine includes an inlet pipe and a draft pipe. The outlet of the inlet pipe 1 is connected with the inlet of the volute 2, and fixed guide vanes 3 are distributed in the outlet of the volute 2. The volute 2 at the outlet of the fixed guide vane 3 is concentrically equipped with uniformly distributed movable guide vanes 4, and the volute 2 at the outlet of the movable guide vane 4 is concentrically equipped with a runner 5. The outlet of the runner 5 is connected with the draft pipe 6. The runner 5 includes evenly spaced blades 501, a hub 502, an upper ring 503 and a lower ring 504. The inner side of the blade 501 is connected to the hub 502, the upper end is connected to the upper ring 503, and the lower end is connected to the lower ring 504. The exit angle of the blade 501 is 21°-23°, the blade inlet angle is 15°-16°, and the blade wrap angle is 34°-35°. The central axis hole of the runner 5 is connected to the main shaft through a key. The main shaft extending above the volute 2 is equipped with a generator motor.

In order to ensure better implementation effects, the volute 2 is one of a turbine volute-type water inlet chamber, a multi-stage pump vortex chamber type water inlet chamber, or a multi-stage pump annular pressurized water chamber type water inlet chamber.

The draft tube 6 is annular, straight conical or elbow-shaped.

In order to reduce the cost of building a pumped storage power station and shorten the construction period, the diagonal flow pump turbine of the present invention is based on the original hydropower station. Without changing the layout and foundation pit of the original conventional hydropower station, the runner is redesigned based on the pump working conditions. The runner is calibrated based on the turbine working conditions to obtain a diagonal flow pump turbine that can meet bidirectional operation.

The axial surface dimensions of the diagonal flow water pump turbine of the present invention are the same as those of the original power generation turbine runner. The guide vane is changed from an airfoil with one-way flow to an airfoil with two-way flow. The other components are made of turbine components from the original hydropower station. The location and type are the same as the original hydraulic generator set.

When the invention is actually working, there are two working states: one is the power-generating turbine working condition, and the other is the pumping water pump working condition. When the power generation turbine is operating, water flows in from the inlet of the water inlet pipe 1, enters the volute 2, flows through the fixed guide vane 3 and the movable guide vane 4 in sequence, flows out from the outlet of the movable guide vane 4, and flows through the runner 5 The rotation of the runner 5 drives the main shaft to rotate, converting the kinetic energy of the water flow into mechanical energy. The generator motor generates electricity. After the water flow flows out from the outlet of the runner 5, it enters the draft pipe 6 and flows out from the outlet of the draft pipe 6.

When the water pump is working, the water flow is the reverse process of the power generation hydraulic turbine. When the water pump is working, the water flow is the reverse process of the turbine. The water is sucked in from the draft pipe 6, and enters the movable guide vane 4 through the runner 5 and is fixed. The guide vane 3 flows out from the fixed guide vane 3, enters the volute 2, and then flows out from the water inlet pipe 1. At this time, the generator motor drives the runner 5 to rotate through the main shaft, converting the mechanical energy of its own rotation into the kinetic energy of the water flow, thereby converting the Excess electrical energy is converted into water energy and stored.

The water flow in the water flow channel formed by the upper reservoir, water inlet pipe, volute, fixed guide vane, movable guide vane, runner, draft pipe, outlet pipe, and lower reservoir can run forward and reverse, forming a Bidirectional conversion structure between mechanical energy and water energy. It can not only use the water in the upper reservoir to generate electricity, but also use the electric energy in the power grid to pump the water in the lower reservoir to the upper reservoir for energy storage, realizing the conversion of the one-way power generation function of the hydropower station into the two-way energy storage and power generation function of pumped storage power generation. .

The design of the invention is scientific and reasonable. It has been verified by experiments and has good effects. The specific parameter information is shown in Table 1, and the runner parameters are shown in Table 2.

Table 1 Main parameters of diagonal flow pump turbine

Table 2 Main parameters of runner

It has been verified by experiments that under the design working conditions, the maximum working efficiency of the turbine is 85.71%, and the maximum working efficiency of the water pump is 86.25%. This efficiency can meet the engineering needs.

The invention has a simple structure, a novel and unique design, utilizes the engineering and equipment resources of the original hydropower station, and saves most of the engineering and equipment investment. Under the condition that the foundation pit of the original hydropower station remains unchanged, an inclined slope that can meet the bidirectional operation is designed. The flow pump turbine can convert a conventional power station into a pumped storage power station, saving about 70% of the construction cost and about 60% of the construction period. It is an innovation in the construction of diagonal flow pumped storage power stations and provides an alternative to pumped storage of conventional hydropower stations. The power station transformation provided technical support and achieved significant social benefits, economic benefits, energy conservation and environmental protection benefits.

Claims (3)

1. The utility model provides a diagonal flow pump hydraulic turbine, includes inlet tube and draft tube, its characterized in that, inlet tube (1) export be linked together with spiral case (2) import, spiral case (2) export in equipartition are equipped with fixed guide vane (3), be equipped with movable guide vane (4) of equipartition in spiral case (2) of fixed guide vane (3) exit, spiral case (2) of movable guide vane (4) exit are equipped with runner (5) with one heart, runner (5) export is linked together with draft tube (6), runner (5) are including blade (501), wheel hub (502), go up ring (503) and lower ring (504) that alternate equipartition, blade (501) inboard links to each other with wheel hub (502), the upper end links to each other with last ring (503), the lower extreme links to each other with lower ring (504), blade (501) exit angle is 21-23, blade entrance angle is 15-16, blade wrap angle is 34-35, the central shaft hole of runner (5) links to each other with the main shaft through the key, be equipped with the generator motor on the main shaft that stretches out above spiral case (2).

2. The diagonal flow pump turbine according to claim 1, wherein the volute (2) is one of a turbine volute inlet chamber, a multistage pump volute inlet chamber, or a multistage pump annular pumping chamber inlet chamber.

3. The diagonal flow pump turbine according to claim 1, characterized in that the draft tube (6) is ring-shaped, right cone-shaped or elbow-shaped.