WO2019061840A1 - Compound multi-stage tidal current energy power generation water turbine - Google Patents

Abstract

Provided is a water turbine based on compound multi-stage tidal current energy power generation, comprising a guide cover (1), a bearing support frame (3), and a rotary wheel composed of a rotating shaft (2) and an impeller, wherein the impeller comprises multiple pear-shaped linear airfoil blades (4); the rotary wheel is fixedly arranged at the two-thirds position of a middle section of the guide cover (1); the guide cover (1) has two trumpet-shaped ends with a narrow inlet and a wide outlet, the middle section thereof is of a linear shape, and the top and the bottom of the guide cover (1) are both of a horizontal plane; and the pear-shaped linear airfoil blades (4) are provided on a blade fixing plate, with the rotating shaft (2) acting as the centre, and the pear-shaped linear airfoil blades (4) are spatially circumferentially distributed and are welded and fixed to the bearing support frame (3). The water turbine has a simple structure and is efficient, and not only can same be used as a water turbine for power generation using ocean tidal current energy, but same can also be used for power generation under conditions of a minute amount of tidal current energy from streams in a mountainous area, plains, a mountain spring, a small reservoir, etc.

Description

[Correct according to Rule 26 27.12.2017] A hybrid multi-stage tidal energy turbine Technical field

The invention belongs to the technical field of fluid machinery and hydropower engineering equipment, and particularly relates to a water turbine based on composite multi-stage tidal energy power generation.

Background technique

Countries in the world today have placed hydropower development at the forefront of energy development. China's total water energy resources are very rich, not only have medium and high head resources, but also low-head resources (including tidal energy) of about 0.8-100 million kilowatts. The development and utilization of new energy, especially the development and utilization of ocean energy, is extremely Development potential. The ocean current power generation relies on the impact of the sea current to make the turbine rotate at a high speed, and then drives the generator to generate electricity. It does not need a high head to create the initial pressure. The power flow can be realized only by the flow velocity of the sea current, and its economic value is very significant.

The turbine impeller is one of the most critical components of the marine tidal generator. The performance of the impeller directly affects the performance of the entire unit, and its manufacturing cost also accounts for about 20% of the entire generator set. The impeller blades of the traditional low-micro-head turbines generally adopt asymmetrically twisted tubular blades, while the marine tidal energy generating turbines mostly draw on the fan blades. The applicable conditions and operating ranges are different, the impeller structure is complex, the manufacturing cost is high, and the operating efficiency is high. Lower.

Chinese Patent Application No. 201310496139 discloses "a marine engine capable of generating a turbine impeller with a shroud", the solution comprising a rotating shaft and a hub and a blade mounted on the hub, the rotating shaft, the hub and the blade are all placed in the impeller chamber, the impeller The two ends of the chamber are the inlet side and the outlet side respectively, and the water flows from the inlet side to the outlet side in the axial direction, and the hub adopts a spherical shape to facilitate the installation of the blade, thereby improving the functional force of the blade. However, the scheme also has the following shortcomings: First, the structure of the shroud is simple, can not play a better energy-concentrating effect, directly affects economic performance; second, it belongs to a single-stage ocean current energy turbine, and the efficiency of power generation by using ocean current energy is low.

Chinese Patent Application No. 201310496522.0 discloses a two-way impeller of a turbine having a shroud for ocean current power generation, comprising a rotating shaft and a hub installed in the impeller chamber, and an "S" type blade mounted on the hub and having a number of 5-7; the impeller chamber The two sides are the inlet side and the outlet side respectively. When generating electricity in the forward direction, the water flows from the inlet side to the outlet side through the shroud. When the power is generated in reverse, the water flows axially to the inlet side through the outlet side. Although the scheme can efficiently convert sea flow energy under the flow of two-way flow, it still The following problems exist: First, it belongs to a single-stage ocean current turbine, and the efficiency of using ocean current energy to generate electricity is low. Second, the turbine blade design still belongs to the traditional design theory. The airfoil is too simple to use the water body flowing through the runner. energy.

Chinese Patent Application No. 201210342709 discloses "a tidal current tidal energy turbine generator set with a shroud type elliptical trajectory, which includes a shroud, a rail bracket, an elliptical rail, a linear bearing, a guiding arm, a straight blade, etc. Although a shroud is used It has improved the energy-collecting effect of tidal energy, but it also has the following shortcomings: First, its vertical-axis blade adopts single elliptical blade design, which can not provide efficient output power; second, it belongs to single-stage ocean current turbine, which utilizes the efficiency of ocean current energy generation. Lower.

In summary, how to overcome the shortcomings of the prior art has become one of the key problems to be solved urgently in the technical field of fluid machinery and hydropower engineering equipment.

Summary of the invention

The object of the present invention is to provide a hydraulic turbine based on composite multi-stage tidal energy generation in order to overcome the deficiencies of the prior art. The invention has the advantages of simple structure and high efficiency, and can be used for a marine tidal power generating turbine or in a mountainous area. Power generation is used under conditions of small tidal currents such as plains, mountain springs, and pond dams.

A hydraulic turbine based on composite multi-stage tidal energy generation according to the present invention is characterized in that it comprises a runner, a bearing support frame, a rotating shaft and an impeller comprising a plurality of pear-shaped wire wings. The type of blade; the runner is fixedly disposed at 2/3 of the middle section of the shroud, the two sides of the shroud are horn-shaped, the inlet is thin, the outlet is thick, the middle section is linear, and the shroud is The top and bottom are horizontal planes; the pear-shaped airfoil blades are centered on a rotating shaft on the blade fixing plate, and the pear-shaped airfoil blades are circumferentially distributed in a space, and are welded and fixed to the bearing support frame; The coordinates of the key points of the wire-wing blade are expressed as follows, where X represents the spatial abscissa value of the key point on the section airfoil curve of the single blade, and Y represents the spatial ordinate value of the key point on the section airfoil curve of the single blade, The parameters are shown in Table 1.

Table 1:

Serial number	X	Y	Serial number	X	Y
1	-6.3651	-8.6932	11	-5.2918	-7.4914
2	-5.3666	-12.4651	12	-4.9568	-8.2264
3	-6.9776	-9.2302	13	-4.4743	-8.8824
4	-8.0461	-10.4499	14	-3.9786	-9.5288
5	-6.1767	-12.3873	15	-3.5105	-10.1953
6	-5.7661	-8.1415	16	-3.1525	-10.9245
7	-7.5615	-9.7976	17	-3.1531	-11.7202

8	-8.2029	-11.2309	18	-3.7656	-12.2275
9	-7.7028	-11.8485	19	-4.5539	-12.4242
10	-6.9668	-12.1922	20	-5.3008	-7.4817

The mathematical equations for the parameters described in Table 1 are: x = 1 + sint; y = a · cost · (1 + sint).

The implementation principle of the present invention is as follows: the specific application process of the present invention is: when the water flows from the water inlet of the shroud into the tidal energy turbine, the work is performed on the runner, and each group of wheels is rotated by the external force, and the rotation output torque thereof; At the same time, multiple sets of runners revolve around the central spindle of the support frame, and the revolution produces another part of the torque. The composite multi-stage tidal energy conversion device can generate two kinds of torques to be transmitted to an external generator set connected thereto to convert tidal current into electric energy. The diversion hood of the tidal energy turbine is designed with a small inlet and a large outlet shape, which can improve the concentrating energy and increase the output power of the tidal energy turbine to enhance the efficiency of the tidal energy turbine.

The significant effect of the present invention over the prior art is:

First, the blade of the hydraulic multi-stage tidal power generating turbine of the present invention adopts a pear-shaped airfoil design, which greatly increases the output of the runner and improves the efficiency of work.

Secondly, the shroud of the combined multi-stage tidal energy power generation turbine of the present invention has a small inlet shape and a large outlet shape, which can improve the concentrating energy gathering energy and increase the tidal flow rate flowing through the turbine; It can improve the inflow effect, smooth the water flow and ensure the stability of the turbine operation.

Thirdly, the combined multi-stage tidal energy power generating turbine of the present invention can utilize the characteristics of tidal current water flow, and the water flow velocity can be generated above 1 m/s, and the low flow rate can be self-started, and can be applied to 0.2 m to 1.5 m. The micro-head water can be converted into water.

Fourth, the hybrid multi-stage tidal power generating turbine of the present invention can not only provide torque to the main shaft by the array of pear-shaped airfoil blades, but also collect the kinetic energy generated by the rotation of each set of pear-shaped airfoil blades. Maximize energy recovery efficiency.

Fifth, the combined multi-stage tidal energy power generating turbine of the present invention can be used not only for a marine tidal power generating turbine, but also for generating electricity under the conditions of small tidal currents such as mountains, plains, mountain springs, and pond dam water.

DRAWINGS

1 is a schematic view showing the overall structure of an impeller of the present invention.

Figure 2 is a schematic illustration of the dimensional relationship of the various portions of the impeller of the present invention.

Figure 3 is a side view of the overall structure of the present invention.

Figure 4 is a schematic view of a single blade section of the present invention.

The numbering in the drawing shows: the flow guide 1, the rotating shaft 2, the rotating wheel support 3, the pear-shaped airfoil blade 4, the water inlet side 5 of the air guiding cover 1, and the water outlet side 6 of the air guiding cover 1; a ₀ is the width of the intermediate section of the flow hood, the width a of the shroud inlet section 1 _1, the width of the outlet section of the shroud 1, a _2, the length of the inlet section of the shroud 1 L _1, shroud 1 the length L _2, the outlet section of the shroud of the intermediate section of a length L _3, the rotary shaft diameter of D ₀ 2, H B ₀ D ₁ of the impeller diameter, the diameter D 3 of the bearing holder _2, runner, The height B _{1 of the} shroud ₁ .

Detailed ways

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

Example 1.

1 to 4, a hydraulic turbine based on composite multi-stage tidal energy generation is characterized in that it comprises a shroud 1, a bearing support frame 3, a rotating shaft 2 and a wheel composed of an impeller. The impeller includes a plurality of pear-shaped airfoil blades 4; the runner is fixedly disposed at 2/3 of the middle portion of the shroud 1, the shroud 1 has a trumpet shape at both ends, and the inlet is thin and the outlet Thick, the middle section is straight, the top and bottom of the shroud 1 are both horizontal planes; the pear-shaped airfoil blades 4 are centered on the rotating shaft 2 on the blade fixing plate, and the space of the pear-shaped airfoil blades 4 The upper circumference is distributed and fixed to the bearing support frame 3; the coordinates of the key points of the pear-shaped airfoil blade 4 are expressed as follows, and X represents the spatial abscissa value of the key point on the sectional airfoil curve of the single blade 4. , Y represents the spatial ordinate value of the key point on the sectional airfoil curve of the single blade 4, and the parameters are shown in Table 1.

Table 1:

Serial number	X	Y	Serial number	X	Y
1	-6.3651	-8.6932	11	-5.2918	-7.4914
2	-5.3666	-12.4651	12	-4.9568	-8.2264
3	-6.9776	-9.2302	13	-4.4743	-8.8824
4	-8.0461	-10.4499	14	-3.9786	-9.5288
5	-6.1767	-12.3873	15	-3.5105	-10.1953
6	-5.7661	-8.1415	16	-3.1525	-10.9245
7	-7.5615	-9.7976	17	-3.1531	-11.7202
8	-8.2029	-11.2309	18	-3.7656	-12.2275
9	-7.7028	-11.8485	19	-4.5539	-12.4242
10	-6.9668	-12.1922	20	-5.3008	-7.4817

The mathematical equations for the parameters described in Table 1 are: x = 1 + sint; y = a · cost · (1 + sint).

Example 2.

FIG. 1 and FIG. 2, the shape of the rotation shaft 2 of the present invention is cylindrical, the shaft diameter ratio of the impeller 2 D ₀ D ₁ is the diameter of the rotation of 0.08 to 0.15, the diameter of the rotation shaft 2 and D ₀ The ratio of the diameter D ₂ of the runner is 0.065 to 0.077.

Example 3.

In conjunction with FIGS. 2 and 3, the ratio of the length of the middle section of L ₁ and the length L ₀ of the shroud of the shroud segment of the present invention, the inlet 1 of 0.08 to 0.15, an outlet section of the shroud 6 ratio of the length of L ₁ and L ₂ is the length of the intermediate section of the shroud 1 0.51 to 0.58; ratio of the width a ₀ shroud inlet section width a 5 1 ₁ and the intermediate section of the shroud 1 is 1.05 to 1.11, the ratio of the width A ₂ of the outlet section 6 of the shroud 1 to the width A ₀ of the intermediate section of the shroud 1 is 1.47 to 1.54; the height B _{0 of the} runner and the height B ₁ of the shroud ₁ The ratio is 0.65 to 0.71.

Each of the interfaces of the shroud 1 perpendicular to the flow direction is rectangular, and the heights of the respective rectangles are equal. In the interface perpendicular to the flow direction, the shroud 1 is vertically symmetrical with the central axis of the hub; the shroud Each of the cross-sections of the first section is equal, the two sections are horn-shaped, and the middle section is streamlined to a straight line.

Example 4.

1 to 4, the number of pear-shaped airfoil blades 4 of the impeller of the present invention is two; the number of impellers disposed on the bearing support frame 3 is three; in the process of flowing, the pear shape The airfoil blade 4 rotates around the axis of the bearing support frame 3 to output torque, and the bearing support frame 3 drives three sets of pear-shaped airfoil blades 4 to revolve around the rotating shaft 2 to output torque; wherein the rotation and revolution power The output ratio is approximately 1:7.

Specific embodiments of the main component dimensions of the present invention are further disclosed below in conjunction with the accompanying drawings.

Example 5.

2 and 3, the diameter of the rotating shaft 2 of the present invention is 14 cm, the diameter of the impeller is 94 cm, and the diameter of the bearing support frame 3 is 183 cm. The inlet section 5 of the shroud 1 has a diameter of 302 cm, the intermediate section of the shroud 1 has a diameter of 270 cm, the outlet section 6 of the shroud 1 has a diameter of 400 cm, and the inlet section 5 of the shroud 1 has a length of 22 cm. The length of the middle section of the shroud 1 is 123 cm, and the length of the outlet section 6 of the shroud 1 is 105 cm. The height of the runner is 47 cm and the height of the shroud 1 is 66 cm. The number of impellers disposed on the bearing support frame is three, and the number of pear-shaped airfoil blades 4 of each group of impellers is two. During the inflow process, the pear-shaped airfoil blade 4 rotates around the axis of the bearing support frame 3 to output torque. The bearing support frame 3 drives the three sets of pear-shaped airfoil blades 4 to revolve around the rotating shaft 2 to output torque; wherein the power output ratio of the rotation and the revolution is 1:7.

Example 6.

2 and 3, the diameter of the rotating shaft 2 of the present invention is 21 cm, the diameter of the impeller is 142 cm, and the diameter of the bearing support frame 3 is 275 cm. The inlet section 5 of the shroud 1 has a diameter of 453 cm, the middle section of the shroud 1 has a diameter of 405 cm, the outlet section 6 of the shroud 1 has a diameter of 606 cm, and the inlet section 5 of the shroud 1 has a length of 33 cm. The length of the intermediate section of the shroud 1 is 184 cm, and the length of the outlet section 6 of the shroud 1 is 158 cm. The height of the runner is 71 cm and the height of the shroud 1 is 100 cm. The number of impellers disposed on the bearing support frame is three, and the number of pear-shaped airfoil blades 4 of each group of impellers is two. During the inflow process, the pear-shaped airfoil blade 4 rotates around the axis of the bearing support frame 3 to output torque, and the bearing support frame 3 drives the three sets of pear-shaped airfoil blades 4 to revolve around the rotating shaft 2 Output torque; the power output ratio of rotation and revolution is 1:7.

Example 7.

2 and 3, the rotating shaft 2 of the present invention has a diameter of 25 cm, the impeller has a diameter of 170 cm, and the bearing support frame 3 has a diameter of 330 cm. The inlet section 5 of the shroud 1 has a diameter of 544 cm, the middle section of the shroud 1 has a diameter of 486 cm, the outlet section 6 of the shroud 1 has a diameter of 728 cm, and the inlet section 5 of the shroud 1 has a length of 40 cm. The length of the middle section of the shroud 1 is 221 cm, and the length of the outlet section 6 of the shroud 1 is 190 cm. The height of the runner is 85 cm and the height of the shroud 1 is 118 cm. The number of impellers disposed on the bearing support frame is three, and the number of pear-shaped airfoil blades 4 of each group of impellers is two. During the inflow process, the pear-shaped airfoil blade 4 rotates around the axis of the bearing support frame 3 to output torque, and the bearing support frame 3 drives the three sets of pear-shaped airfoil blades 4 to revolve around the rotating shaft 2 Output torque; the power output ratio of rotation and revolution is 1:7.

It has been verified by experiments that a hydraulic turbine based on composite multi-stage tidal energy generation can be self-starting at a flow rate of 1 m/s or more and has high efficiency. Compared with the traditional dam power generation, the turbine of the present invention not only can well protect the natural environment, but also greatly reduces the cost of the generator set and achieves the purpose of efficiently utilizing the tidal energy.

Descriptions not mentioned in the Detailed Description of the Invention are well known in the art and can be implemented with reference to known techniques.

The invention has been verified by trial and error and has achieved satisfactory trial results.

The above specific embodiments and embodiments are specific support for the technical idea of the hydraulic turbine based on the composite multi-stage tidal energy generation, and the scope of protection of the present invention cannot be limited thereto. Any equivalent changes or equivalent modifications made on the basis of the technical solutions are still within the scope of protection of the technical solutions of the present invention.

Claims (5)

1. A hydraulic turbine based on composite multi-stage tidal energy power generation, comprising: a runner (1), a bearing support frame (3), a rotating shaft (2) and a wheel composed of an impeller, the impeller comprising a plurality of a pear-shaped airfoil blade (4); the runner is fixedly disposed at 2/3 of the middle portion of the shroud (1), the two ends of the shroud (1) are flared, and the inlet is thin. The outlet is thick, the middle section is linear, and the top and bottom of the shroud (1) are horizontal; the pear-shaped airfoil blade (4) is centered on the rotation axis (2) on the blade fixing plate, pear shape The linear airfoil blades (4) are spatially distributed circumferentially and welded to the bearing support frame (3); the coordinates of the key points of the pear-shaped airfoil blades (4) are expressed as follows, and X represents a single blade ( 4) The spatial abscissa value of the key point on the section airfoil curve, Y represents the spatial ordinate value of the key point on the section airfoil curve of the single blade (4), the parameters are shown in Table 1.

   Table 1:

   Serial number X Y Serial number X Y 1 -6.3651 -8.6932 11 -5.2918 -7.4914 2 -5.3666 -12.4651 12 -4.9568 -8.2264 3 -6.9776 -9.2302 13 -4.4743 -8.8824 4 -8.0461 -10.4499 14 -3.9786 -9.5288 5 -6.1767 -12.3873 15 -3.5105 -10.1953 6 -5.7661 -8.1415 16 -3.1525 -10.9245 7 -7.5615 -9.7976 17 -3.1531 -11.7202 8 -8.2029 -11.2309 18 -3.7656 -12.2275 9 -7.7028 -11.8485 19 -4.5539 -12.4242 10 -6.9668 -12.1922 20 -5.3008 -7.4817

   The mathematical equations for the parameters described in Table 1 are: x = 1 + sint; y = a · cost · (1 + sint).
2. A hydraulic turbine based on hybrid multi-stage tidal energy power generation according to claim 1, wherein said rotating shaft (2) has a cylindrical shape, a diameter D _{0 of the} rotating shaft (2) and an impeller ratio of the diameter D ₁ is 0.08 ~ 0.15, D ₂ is the diameter ratio of the diameter D ₀ of the rotating shaft and the runner (2) is 0.065 to 0.077.
3. A hydraulic turbine based on hybrid multi-stage tidal energy power generation according to claim 2, characterized in that: the length L ₀ of the inlet section of the shroud (1) and the middle section of the shroud (1) The ratio of the length L ₁ is 0.08 to 0.15, and the ratio of the length L ₂ of the outlet section of the shroud (1) to the length L ₁ of the intermediate section of the shroud (1) is 0.51 to 0.58; the shroud (1) The ratio of the inlet width A ₁ to the width A ₀ of the intermediate section of the shroud (1) is 1.05 to 1.11, and the width A ₂ of the outlet section of the shroud (1) and the middle section of the shroud (1) a ₀ is the ratio of the width of 1.47 to 1.54; the ratio of the height of the wheel and the shroud B ₀ (1) the height B ₁ is 0.65 to 0.71.
4. A hydraulic turbine based on hybrid multi-stage tidal energy power generation according to claim 3, wherein each of the interfaces of the shroud (1) perpendicular to the incoming flow direction is rectangular, and the heights of the respective rectangles are equal. In the interface perpendicular to the incoming flow direction, the shroud (1) is vertically symmetrical with the central axis of the hub; each of the shrouds (1) has the same cross-section, the two segments are horn-shaped, and the middle section is streamlined. To the straight line.
5. A hydraulic turbine based on hybrid multi-stage tidal energy power generation according to claim 4, wherein the number of the pear-shaped airfoil blades (4) of the impeller is two; and is disposed on the bearing support frame (3) The number of impellers is three; the pear-shaped airfoil blade (4) rotates around the axis of the bearing support frame (3) to output torque, and the bearing support frame (3) drives three sets of pear-shaped lines. The airfoil blade (4) revolves around the rotating shaft (2) to output torque; wherein the power output ratio of the rotation and the revolution is 1:7.

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