CN103321820B - Multidirectional self-adaptive suspended tidal current energy turbine - Google Patents

Abstract

The invention discloses a multi-directional self-adaptive suspension type tidal current energy turbine, which comprises an upper balance blade, a lower balance blade, a shroud, a turbine blade, a generator, a connection fixing rod and an anchor ring, an upper balance blade and a lower balance blade Installed above and below the windshield, the turbine blades are fixed on the outer side of the rotor of the generator, the generator is fixed on the windshield through a connection fixing rod, and an anchor ring is installed on the outer side of the windshield. Among them, there are three connecting and fixing rods, which are uniformly arranged radially with the axis of the generator as the center, and the angle between every two connecting and fixing rods is 120°. After the device is installed, the suspension system can make real-time downstream posture adjustment according to the change of tidal current flow direction, and keep the incoming flow direction consistent with the axis of the shroud, that is, perpendicular to the blade rotation plane. It has considerable power generation efficiency at a small flow rate.

Description

Multidirectional self-adaptive suspended tidal current energy turbine

The present invention is a divisional application with the application number 201110095866.1, the application date is April 18, 2011, and the invention name is "multidirectional self-adaptive suspension type tidal current energy turbine".

technical field

The invention relates to tidal energy power generation equipment, in particular to a multi-directional self-adaptive suspension type tidal energy water turbine suitable for sea areas where the ocean current velocity is not high and the incoming flow direction changes frequently.

Background technique

Tidal current energy is a renewable form of energy generated by the flow of sea water caused by tidal fluctuations. The utilization principle of tidal current energy is similar to that of wind power generation, and its power generation device is vividly compared to an "underwater windmill". Since the density of seawater is more than 800 times that of air, the more common sea current energy flow density of 2m/s is equivalent to a wind speed of 18.8m/s with a wind speed of level 8. Moreover, the current is mainly caused by the gravitational effect of the moon, which is more regular than the wind energy caused by uneven solar radiation. In addition, compared with tidal energy, tidal current energy utilization also has the advantages of less investment, no need to build dams, and less negative impact on the environment. The development of tidal current energy and renewable energy is not only the strategic need for future energy technology reserves, but also the only choice to solve the shortage of energy supply in island areas.

British SMDHydrovision Company has designed an underwater mooring axial flow turbine named TidEL. The system is fixed to the seabed by two taut mooring cables, and the buoyancy of the wing chamber and the rotor provides tension on the vertical cables, keeping the system suspended underwater. The specially designed variable speed and constant frequency technology enables TidEL to achieve the best hydrodynamic performance in each flow velocity range; the design of the fixed inclination angle of the blade can effectively simplify the turbine structure and reduce the overall cost of the system; the hollow and sealed airfoil chamber can be used as a suspension device It provides buoyancy and provides an anti-overturning moment for maintaining the balance of the system; the anchoring and fixing method enhances the flexibility of the entire device, is easy to install and move, and can be completely submerged in water. However, the system’s ability to resist the harsh marine environment is relatively weak. The main manifestations are: 1. There is no protective facility around the turbine blades. Under high-speed tidal currents, the rotating blades are in danger of touching the mooring cables; 2. The buoyancy provided by the wing chamber and the rotor is difficult to resist the overturning moment caused by the impact of the water flow. , in the complex marine environment, its adaptive survivability is poor.

Contents of the invention

In order to overcome the defects of low power generation efficiency at low flow rates and poor stability and self-adjustment in complex incoming flow directions of existing axial flow hydroelectric generators, the present invention provides a multi-directional self-adaptive suspension type tidal current energy generator equipped with a shroud. water turbine.

The technical solution adopted by the present invention to solve its technical problems is:

The multi-directional self-adaptive suspension type tidal current energy turbine includes an upper balance blade, a lower balance blade, a shroud, a turbine blade, a generator, a connection fixing rod and an anchor ring, and the upper balance blade and the lower balance blade are installed on the side of the shroud. Above and below, the turbine blades are fixed on the outer side of the rotor of the generator, the generator is fixed on the spinner by connecting the fixing rod, and the outer side of the spinner is equipped with an anchor ring. Among them, there are three connecting and fixing rods, which are uniformly arranged radially with the axis of the generator as the center, and the angle between every two connecting and fixing rods is 120°.

As a further optimization of the above-mentioned technical solution, the shroud is a two-way tubular structure with an arc-shaped inner surface. The shroud is based on the section line A-A in the middle, and the upper part is a completely hollow body, which is mainly used to provide an upper surface for the entire suspension structure. Buoyancy, the lower part of the shroud is a semi-hollow body with adjustable volume, and its lower end needs to be filled with counterweights. The center of buoyancy and the center of gravity are on the same horizontal axis. The center of buoyancy is on the top, and the center of gravity of the system is on the top; It should be determined according to the actual sea conditions and power generation efficiency requirements. If the perennial ocean current is small in the area where the turbine is placed, a small amount of counterweights should be filled in the lower part of the dome to improve the power generation efficiency of the turbine, so as to ensure that the suspension structure is basically at a higher speed of the ocean current. the upper layer. If the ocean current velocity in the sea area where the turbine is placed is high all the year round, it is necessary to fill more loads to ensure that the suspension structure is in the low velocity area near the seabed under the large ocean current velocity. Although this reduces the power generation efficiency of the turbine, it also reduces the The risk of structural strength damage to the suspended structure under extreme sea conditions; the increase or decrease of counterweights should also refer to the structural stability requirements. The upper limit of the counterweight is at the design maximum current speed, the suspension structure does not touch the bottom, and the lower limit of the counterweight is the design minimum current. At high speeds, the central axis of the shroud can still be kept in line with the direction of the incoming flow, that is, the structure will not overturn due to insufficient counterweight; the upper balance wing is a memory titanium alloy hollow body or a glass fiber reinforced plastic hollow body.

The device is moored in the waters with rich ocean currents through the mooring cable. The lower end of the cable is connected with the collar on the upper end of the underwater pile foundation. The collar can freely rotate 360 degrees along the axis of the pile foundation; the anchoring cable must be long enough. However, the upper limit of the length should ensure that it does not expose the sea surface at the design minimum current speed, and it is best not to affect the water surface transportation.

The advantages of the present invention are: the guide cover itself has a self-suspension function and has good stability against overturning. After the device is installed, the suspension system can make real-time downstream posture adjustment according to the change of tidal current flow direction. The incoming flow direction is consistent with the axis of the shroud, that is, perpendicular to the blade rotation plane. It has considerable power generation efficiency at a small flow rate. The shroud is a two-way tubular structure with an arc-shaped inner surface. There are trumpet-shaped openings on both sides of the front and rear sides along the flow. The diameter of the openings is equal. Speed, so as to effectively improve the power generation efficiency and low-speed start-up performance of the turbine system. The opening structure of the rear horn mainly diffuses the internal fluid rapidly. This structure can further improve the flow velocity and the stability of the flow field in the cover, and optimize the flow field in the cover. The effect is obvious. The outer diameter of the shroud remains unchanged, and its outer surface is smooth and smooth, so that the surrounding flow field is stable, the streamline is straight, the stability of the suspension system is enhanced, and the common two-way tubular flow gathering device is effectively avoided due to the reduction of the outer diameter of the middle section. vortex phenomenon. The device is in a suspended state in the water, so it can adjust the suspension adaptively in the water depth direction and horizontal plane according to the flow velocity and direction changes. According to the principle of static force balance, the system automatically floats into the high flow velocity close to the sea surface under the low current velocity. area, to ensure that the turbine system has considerable power generation efficiency. Under high sea current velocity, the system automatically dives to the low flow velocity area near the seabed, effectively reducing the risk of breakage of the turbine blades in a strong ocean current environment. The upper and lower balance wings are arranged back and forth in the direction of water flow, the upper balance wing is located on the downstream side, and the lower balance wing is located on the upstream side. This arrangement can effectively resist the overturning moment of the suspension device at too high or too low sea current speed, thereby Improve the anti-overturning performance of the suspension system.

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a perspective view of a multidirectional self-adaptive suspension type tidal energy turbine of the present invention.

Fig. 2 is a front view of the multidirectional self-adaptive suspension type tidal energy turbine of the present invention.

Fig. 3 is a rear view of the multi-directional self-adaptive suspension type tidal energy water turbine of the present invention.

Fig. 4 is a sectional view of plane A-A of the multi-directional self-adaptive suspension type tidal energy water turbine of the present invention.

Fig. 5 is a right view of the multi-directional self-adaptive suspension type tidal energy water turbine of the present invention.

detailed description

As shown in Figures 1-5, a multi-directional self-adaptive suspension type tidal current energy turbine of the present invention is an axial flow structure, including an upper balance wing 1, a shroud 2, a turbine blade 3, a generator 4, and a connecting fixed rod 5 , mooring ring 6 and lower balance wing 7, two balance wings 1, 7 are respectively installed on the top and the bottom of the wind deflector 2, and are arranged front and back in the water flow direction, and the upper balance wing 1 is located at the downstream of the axis of the wind deflector 2 side, the lower balance wing 7 is located on the upstream side of the axis of the spinner 2, the turbine blade 3 is fixed on the outer side of the rotor of the generator 4, and the base of the generator 4 is fixed on the inner side of the spinner 2 by connecting the fixed rod 5, and the flow guide A pair of left-right symmetrical anchor rings 6 are installed on the outer side of the cover 2 .

There are three connecting and fixing rods 5 in each shroud 2, which are used to fix the base of the generator 4. The cross-section of the connecting and fixing rods 5 is NACA-0012 airfoil, and they are evenly arranged radially around the generator axis. , are 120° to each other; each turbine 3 is composed of three 3 blades, the axis of the turbine is consistent with the axis of the generator 4, the shroud 2 and the incoming flow direction; the shroud 2 is a two-way tubular structure, and the inner surface is double Curved shape, smooth profile, small water blocking effect, trumpet-shaped openings on both sides of the front and rear sides of the flow, the opening diameters are equal, and the shroud 2 is based on the openings on both sides, covering a cylinder of the same material with the same diameter, forming two The outer surface of the air chamber should be kept smooth to enhance the structural stability of the suspension system under extreme sea conditions. Based on the section line A-A in the middle, the upper part of the shroud air chamber is a complete hollow body, and the lower part is a semi-hollow body with adjustable volume. The counterweight should be fixed at the bottom end of the adjustable hollow body, and the weight should be configured according to actual needs. ;The upper balance wing 1 is a memory titanium alloy hollow body or glass fiber reinforced plastic hollow body, and the cross section is NACA-0008 airfoil; the lower balance wing 1 is a solid glass fiber reinforced plastic body, and the cross section is NACA-0008 airfoil; the whole system is suspended in sea water state, the upper balance wing 1, the lower balance wing 7, the left and right air chambers of the fairing 2, and the drainage volume of the watertight generator provide buoyancy for the whole device, which is equal to the weight of the whole set of equipment, and the adjustable hollow body. The sum of the vertical component of the tension force of the counterweight and the mooring cable enables the suspension system to maintain a stable underwater power generation state under various sea conditions.

After the equipment is installed, it will be moored in waters with rich ocean currents through two mooring cables of equal length. The lower end is connected with the collar at the upper end of the underwater pile foundation, and the collar can freely rotate 360 degrees along the axis of the pile foundation.

When the multidirectional self-adaptive suspension type tidal energy turbine of the device is impacted by ocean currents, the turbine blades 3 start to rotate around the axis of the generator 4 to drive the generator 4 to generate electricity. Since the device is softly fixed by mooring cables underwater, and the collar connected to the lower end of the cable can freely rotate 360 degrees along the axis of the pile foundation, so when the direction of water flow changes, the whole device will automatically As the water flow direction rotates in the horizontal plane, the rotation plane of the turbine blade 3 is always perpendicular to the water flow direction, so that the maximum power generation efficiency can be maintained at any flow speed, so the device has good power generation efficiency.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall fall within the protection scope of the present invention.

Claims (2)

1. A multidirectional self-adaptive suspension type tidal current energy turbine comprises a first water turbine and a second water turbine arranged separately; said water turbine comprises a shroud (2), a turbine blade (3), a generator (4), Connect the fixed rod (5) and the anchor ring (6); it is characterized in that: it also includes an upper balance wing (1) and a lower balance wing (7), and the upper balance wing (1) is installed on the first The top of the water turbine and the flow guide cover of the second water turbine, and the upper balance wing (1) extends from the flow guide cover of the first water turbine to the flow guide cover of the second water turbine; the lower balance wing (7) installed below the spinners of the first turbine and the second turbine, and the lower balance wing (7) extends from the spinner of the first turbine to the second turbine Spinner cover; the first water turbine and the second water turbine are connected together by the upper balance blade (1) and the lower balance blade (7); the upper balance blade (1) and the lower balance blade (7) Arranged forward and backward in the direction of water flow, the upper balance wing (1) is located on the downstream side of the axis of the wind deflector (2), and the lower balance wing (7) is positioned on the upstream side of the axis of the wind deflector (2); The balance wing is a memory titanium alloy hollow body or a glass fiber reinforced plastic hollow body, and the lower balance wing is a glass fiber reinforced plastic solid body; the turbine blade (3) is fixed on the outside of the rotor of the generator (4), and the generator (4) is connected to the fixed rod (5 ) is fixed on the flow deflector (2), and an anchor ring (6) is installed on the outside of the flow deflector (2) of the first water turbine and the flow deflector (2) of the second water turbine; (2) It is a two-way tubular structure with an arc-shaped inner surface, with trumpet-shaped openings on both sides forward and backward along the flow. The diameters of the openings are equal, and the peripheral diameter of the shroud remains unchanged. 2. The multidirectional self-adaptive suspension type tidal energy turbine according to claim 1, characterized in that the shroud (2) is based on the openings on both sides and covers a cylinder of the same material with an equal diameter to form two sealed air The air guide is based on the middle section line A-A, and the upper part is a completely hollow body, which is mainly used to provide buoyancy for the entire suspension structure. The lower part of the air guide is a semi-hollow body with adjustable volume, and the counterweight is fixed on the adjustable The lowermost end of the hollow body.