CN1828042B - Counter-rotating tubular flow turbine runner capable of bidirectional power generation - Google Patents

Abstract

The invention relates to a disrotation through flow hydraulic turbine wheel with bidirectional generation. It is characterized in that: it comprises two groups of wheels that reversely mounted along the middle axle of hydraulic turbine, which are mounted with S-shape blades in same number and in reverse rotational directions. The invention can realize bidirectional generation, without guide blade. It has simple structure, while the back wheel uses the circular amount at the outlet of front wheel; the water flows out axially. And the positive and passive directions have same efficiency, to fully utilize the tide energy.

Description

Counter-rotating tubular flow turbine runner capable of bidirectional power generation

technical field

A counter-rotating tubular water turbine runner capable of bidirectional power generation belongs to the technical field of fluid machinery and engineering equipment, and particularly relates to the design technical field of tubular water turbines.

Background technique

Tubular turbine is a kind of hydropower equipment widely used in low water head conditions, and is also widely used in tidal power stations. The water flow axially flows into the blades of the runner, pushes the runner to do work, and flows out axially, basically without changing the flow direction. Tubular turbines are generally suitable for water heads below 25 meters, with outputs ranging from hundreds of kilowatts to hundreds of thousands of kilowatts.

With the development of industry and agriculture and the advancement of science and technology, the development and utilization of new energy is becoming more and more urgent. At present, in the development of marine energy, the tidal power generation technology is basically mature, and the main power generation equipment is the tubular turbine. A tubular turbine generally consists of a water guide mechanism, a runner, a runner chamber, and a draft tube. The water guiding mechanism is installed before the runner and the runner chamber, providing a certain amount of positive circulation for the water flow entering the runner chamber, so as to push the runner blades to do work; the runner is the main device for energy conversion, which converts the energy of the water flow into The mechanical energy is finally converted into electrical energy; the draft tube mainly plays the role of recovering energy and improving the utilization rate of water flow energy. During the working process of the above-mentioned tubular water turbine, the water flow flows in one direction, and only one set of runner blades rotates in one direction, so it can only generate electricity in one direction. At present, there are two-way tubular water turbines using S-shaped blades in tidal power stations. This unit has only one set of runner blades that rotate in one direction. Although it can realize two-way power generation, its structure is complicated and its efficiency is not high, so it has not been widely used. .

Contents of the invention

The purpose of the present invention is to design a tubular water turbine runner with a new structure, which can realize two-way power generation by the generator set, and has a simple structure and high efficiency. It can be widely used in tidal power stations to further improve the utilization rate of tidal energy.

The present invention is characterized in that it comprises two sets of runners installed in opposite directions along the central axis of the water turbine, the two runners are equipped with S-shaped blades with the same number of blades, and the rotation directions of the two runners are opposite.

The distance between the two sets of runners in the axial direction is 45%-95% of the average chord length.

The number of S-shaped blades of the two sets of runners is 3-6.

The rotational speed ratio of the two sets of runners is 1:1-2:1.

Compared with the prior art, the present invention has the following advantages and outstanding effects: it can generate electricity in two directions; it does not need to assemble guide vanes and has a simple structure; the rear runner utilizes the circulation of the outlet of the front runner; The flow path is straight, the loss is small, the efficiency is high, and the high efficiency area is wide; the forward and reverse efficiency is the same under the same working conditions, and the tidal energy is more fully utilized.

Description of drawings

Figure 1 Schematic diagram of the structure of the counter-rotating through-flow runner.

Figure 2 is the A-A sectional view at the radius R, that is, the S-shaped blade sectional view.

In the figure: 1-runner chamber; 2-front runner; 3-rear runner; 4-S-type runner blade; 5-turbine shaft; 6-pivot; 7-center shaft.

Detailed ways:

Fig. 1 is a schematic structural view of a counter-rotating through-flow runner provided by the present invention. This counter-rotating through-flow runner includes two sets of runners using S-shaped blades 4, namely the front runner 2 and the rear runner 3, and both sets of runners use the same S-shaped blade 4 to form a Counter-rotating tubular runner. The two sets of runners are arranged axially, and the installation direction of the inlet and outlet sides of the blades of the front runner 2 is opposite to that of the blades of the rear runner 3, that is, the inlet side of the blades of the front runner is used as the rear rotor The outlet side of the wheel blade is placed, and the outlet side of the front runner blade is placed as the inlet side of the rear runner blade, as shown in Figure 2. The rotation directions of the front and rear runners are opposite, and the speed ratio is 1-2. The distance between the two sets of runners in the axial direction is 45% to 95% of the average chord length of the blades. The number of blades of the front and rear runners is equal, 3 to 6 respectively.

When the counter-rotating tubular turbine works, the water flows in and out axially, and the turbine does not need guide vanes. When the water flows through the first runner, the inlet circulation is zero and the outlet circulation is negative. Since the rotation direction of the rear runner is opposite to that of the front runner, the negative circulation of the outlet of the front runner is replaced by the rear runner. The runner is used to become the positive circulation volume of the inlet of the rear impeller. Since the two sets of runners both use S-shaped blades, bidirectional power generation can be realized, and the forward and reverse turbines have the same performance under the same working conditions. The tubular turbine with counter-rotating wheels has a simple structure, straight flow path, small loss, relatively high efficiency, and a wide high-efficiency area, which can make full use of tidal energy.

Claims (1)

1. can two-way generating to revolving the tubular turbine runner, it is characterized in that contain the runner that two covers are oppositely installed along the water turbine axis, described two runners are equipped with the S type blade of the identical number of blade, the sense of rotation of these two runners is opposite; Described two cover runners are 45%～95% of mean chord in axial spacing; The S type number of blade of described two cover runners is 3～6; The rotating speed ratio of described two cover runners is 1: 1～2: 1.