CN204327392U - A kind of vertical-axis tide energy electricity generating device - Google Patents

Abstract

The utility model relates to a vertical axis tidal current energy generating device. The generating device includes a first base, a second base, a generator, an upper impeller and a lower impeller; the generator includes a rotor and a stator; The rotor is assembled on the first rotating shaft; one end of the first rotating shaft is connected to the generator, and the other end is connected to the upper impeller; the other end of the upper impeller is connected to the first base through a connecting device; the power generation The lower end of the machine is connected to the second rotating shaft, one end of the second rotating shaft is connected to the stator, and the other end is connected to the lower impeller; the upper impeller and the lower impeller are both SAVONIUS type blades; the blades include concave blades and convex blades , where the overlapping ratio S/D of concave and convex vanes is fixed at 0.2. Its advantages are as follows: good self-starting performance; improved device stability and working conditions of connecting devices; improved power generation efficiency; complex gear transmission mechanism and other mechanical components are omitted.

Description

A vertical axis tidal current energy generating device

technical field

The utility model relates to the technical field of comprehensive utilization of marine renewable energy, in particular to a vertical axis tidal current energy generating device.

Background technique

As a clean and pollution-free green renewable new energy, tidal current energy has the characteristics of large reserves, wide distribution, strong predictability, and low environmental pollution. The development and utilization of tidal current energy has important practical significance for alleviating energy shortage and reducing environmental pollution. The main form of tidal current energy utilization is to use the tidal current energy generating device to generate electricity. The principle is: the tidal current energy impacts the water turbine and converts the kinetic energy of the tidal current energy flow into the mechanical energy of the water turbine. The water turbine drives the generator to generate electricity through the mechanical transmission device, and converts the mechanical energy into electrical energy. Tidal current energy generating devices are divided into horizontal axis type and vertical axis type according to the structure of the turbine.

In the prior art, the horizontal-axis tidal current energy generation device is very similar to the current wind power generator, and is often called an "underwater windmill". The principle is that the horizontally arranged impeller starts to rotate under the action of water flow, and then transmits energy to the generator through the hub shaft and transmission system, and drives the generator to generate electricity. The disadvantage of the horizontal axis tidal current energy generation device is that it needs to constantly adjust the direction to keep in line with the direction of the tidal energy, the blades are huge and complex in shape, the manufacturing is difficult and costly, and the hub structure and installation of the nacelle are inconvenient.

Most of the vertical-axis tidal current energy generation devices adopt the structure of straight blades with fixed deflection angles. The self-starting performance of such blades is relatively poor, and the angle of attack of the airfoil changes continuously during the rotation of the blades, which makes the blades unable to work all the time. The best airfoil angle of attack, so the efficiency of impeller energy capture is low; the periodic changes in the position of the blades also cause periodic changes in the force on the rotating shaft, the vibration of the unit is large, and the working conditions of the rotating shaft and bearings are poor.

Chinese patent document CN201020621184.0, the patent name is "A Vertical Axis Tidal Current Power Generation Device", which discloses a vertical tidal current power generation device, which includes three modules: an upper platform part, a support frame part, and an impeller part; the upper platform part includes a generator , gearbox, horizontal connecting shaft, supporting platform, pillars and vertical connecting shaft; the supporting frame part is composed of upper frame plate, lower frame plate, left frame plate and right frame plate; the impeller part includes main shaft, spoke sleeve, spoke, spoke Shafts, blades, blade shafts, rims and adaptive angle-of-attack devices.

This scheme has good structural strength and can be developed in the direction of large-scale. It can be applied under floating platforms, pile foundations and tension legs, which is convenient for production, manufacturing, installation and commissioning. However, the whole structure is relatively complicated, and the transmission motion form of the whole device from the impeller to the generator is complex, the utilization rate of useful power gradually decreases during the transmission process, and the energy collection efficiency and energy conversion rate are low.

Chinese patent document CN200910073171.6, the patent name is "high-power vertical tidal current shaft device", discloses a high-power vertical tidal current shaft device. On the top of the tower, anchor chain plate eyes are distributed on the outer edge of the engine room to connect the buoy to the anchor with cables. The main shaft of the water turbine is sleeved on the tower. Bearings are arranged at both ends of the main shaft of the water turbine. Fixed on the hub of the main shaft, the bevel gear on the main shaft engages with the small bevel gear on the generator shaft in the nacelle, the upper end of the main shaft and the lower wall of the nacelle and the tower column are equipped with a sealed bushing, the base and the universal ball joint are connected by flanges.

The scheme provides a vertical axis tidal current energy generating device capable of solving the overall structural problems of large-scale hydro turbines and realizing high-power stand-alone units. However, the water turbine has poor self-starting performance, great manufacturing difficulty, high cost, inconvenient installation of the hub structure of the nacelle, and short service life.

In summary, there is an urgent need for a vertical axis tidal current energy generation device that improves energy collection efficiency and energy conversion efficiency, improves power generation efficiency, simplifies the mechanical structure, prolongs the service life, and has good self-starting performance. The power generation device has not been reported yet.

Contents of the invention

The purpose of the utility model is to address the deficiencies in the prior art, and provide a vertical axis tidal current power generation device with improved energy collection efficiency and energy conversion efficiency, improved power generation efficiency, simplified mechanical structure, extended service life, and good self-starting performance.

In order to achieve the above object, the technical scheme that the utility model takes is:

A vertical axis tidal current energy generating device, the generating device includes a first base, a second base, a generator, an upper impeller, and a lower impeller; the generator includes a rotor and a stator; the rotor and the stator Coaxial reverse rotation; the rotor is assembled on the first rotating shaft; one end of the first rotating shaft is connected to the generator, and the other end is connected to the upper impeller; the other end of the upper impeller is connected to the second rotating shaft through a connecting device A base is connected; the lower end of the generator is connected to the second rotating shaft, one end of the second rotating shaft is connected to the stator, and the other end is connected to the lower impeller; the other end of the lower impeller is connected to the second base through a connecting device connection; the upper impeller and the lower impeller have the same structural shape, the upper impeller and the lower impeller are installed on the same axis, and the installation directions of the upper impeller and the lower impeller are opposite; the upper impeller and the lower impeller are both SAVONIUS type blades; the blade It includes concave blades and convex blades, wherein the overlapping ratio S/D of the concave blades and the convex blades is fixed at 0.2; the concave blades and the convex blades are integrally formed at one time; the surface of the concave blades and the convex blades is smooth; the The concave blades of the upper impeller correspond to the convex blades of the lower impeller, and the convex blades of the upper impeller correspond to the concave blades of the lower impeller.

The number of blades of the upper impeller and the lower impeller is 2.

The power generation device also includes an anchor chain fixing frame and a bearing support frame; four anchor chain fixing frames are fixedly riveted between the first base and the second base, and the anchor chain fixing frame is connected to the bearing bracket; The bearing bracket described above is fixedly connected to the outer wall of the bearing; the inner wall of the bearing is fixedly connected to the generator through screws.

The number of the power generating device is at least one.

The utility model has the advantages that:

1. The selection of SAVONIUS blades overcomes the disadvantage of poor self-starting performance of fixed-angle straight blades. No matter which direction the water flows through, the upper impeller and the lower impeller can rotate in the opposite direction on the same axis. It can be rotated and has good self-starting performance;

2. The upper impeller and the lower impeller are coaxial and reversed, and the torques cancel each other out, which improves the stability of the device and improves the working conditions of the connecting device;

3. The stator and rotor rotate in opposite directions, which increases the relative movement speed between them and improves the power generation efficiency;

4. The impeller of the vertical axis tidal current energy generation device has a type of upper and lower double impellers, and is directly connected with the stator and the rotor, which saves the complicated mechanical parts such as gear transmission mechanism, simplifies the mechanical structure and prolongs the service life;

5. This device can supply power for off-shore and off-grid lighthouses, buoys and other devices.

Description of drawings

Accompanying drawing 1 is a structural schematic diagram of a vertical axis tidal current energy generating device of the present invention.

Accompanying drawing 2 is the front view of a vertical axis tidal current energy generating device of the present utility model.

Accompanying drawing 3 is the structure diagram of upper impeller of the present utility model.

Accompanying drawing 4 is the top view of the upper impeller of the present utility model.

Figure 5 is a structural schematic diagram of another vertical axis tidal current energy generating device of the present invention.

Accompanying drawing 6 is a structural schematic diagram of another vertical axis tidal current energy generating device of the present invention.

Detailed ways

The specific embodiment provided by the utility model will be described in detail below in conjunction with the accompanying drawings.

The reference signs and components involved in the accompanying drawings are as follows:

1. The first base 2. The second base

3. Anchor chain holder 4. Bearing bracket

41. Bearing 5. Generator

6. First axis of rotation 61. Second axis of rotation

7. Upper impeller 71. Concave blade

72. Convex blade 8. Lower impeller

9. Connection device

Example 1

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a vertical axis tidal current energy generating device of the present invention. A vertical axis tidal current energy power generation device, the power generation device includes a first base 1 and a second base 2, and four anchor chain fixing frames 3 are fixedly riveted between the first base 1 and the second base 2 , the anchor chain fixture 3 is connected to the bearing bracket 4; the bearing bracket 4 is fixedly connected to the outer wall of the bearing 41; the inner wall of the bearing 41 is fixedly connected to the generator 5 by screws; the generator includes a rotor and Stator (not shown in the figure).

Please refer to FIG. 2 , which is a front view of a vertical axis tidal current energy generating device of the present invention. The rotor is assembled on the first rotating shaft 6; one end of the first rotating shaft 6 is connected to the generator 5, and the other end is connected to the upper impeller 7; the other end of the upper impeller 7 is connected to the first rotating shaft through a connecting device 9 A base 1 is connected; the lower end of the generator 5 is connected to the second rotating shaft 61, and one end of the second rotating shaft 61 is connected to the stator, and the other end is connected to the lower impeller 8; the other end of the lower impeller 8 passes through The connecting device 9 is connected with the second base 2 .

Please refer to FIG. 3 , which is a structural schematic diagram of the upper impeller of the present invention. The upper impeller 7 is provided with a SAVONIUS type blade, and the blade includes a concave blade 71 and a convex blade 72; the concave blade 71 and the convex blade 72 are integrally formed at one time, and the surface of the concave blade 71 and the convex blade 72 smooth.

Please refer to FIG. 4 , which is a top view of the upper impeller of the present invention. The concave vanes 71 and the convex vanes 72 overlap each other, wherein the overlapping ratio S/D of the concave vanes 71 and the convex vanes 72 is fixed at 0.2.

The shape and structure of the upper impeller 7 and the lower impeller 8 are the same, and the upper impeller 7 and the lower impeller 8 are installed on the same axis, and the installation directions of the upper impeller 7 and the lower impeller 8 are opposite, that is, the concave blades 71 of the upper impeller 7 and the lower impeller 8 The convex blade 72 of the upper impeller 7 corresponds to the concave blade 71 of the lower impeller 8 .

It should be noted that: the number of blades of the SAVONIUS type is selected, and the number of blades can be 2-8 blades. According to relevant tests, the preferred number of blades in this embodiment is 2 pieces. High, which makes the whole device lighter, and it is easier to place when the whole device hangs below the floating body; the overlap ratio S/D of the SAVONIUS blade is one of the parameters that affect the static and dynamic performance. According to practical experience, the overlap ratio S/D When it is 0.2, the energy collection efficiency and energy conversion efficiency are the highest.

The first base 1 and the second base 2 are the carriers of the entire power generation device; the anchor chain fixing frame 3 fixes the entire power generation device on the seabed through the anchor chain, and will not be washed down by tidal current energy; The bearing bracket 4 is connected to the anchor chain fixing frame 3. During the fixed installation process, the anchor chain fixing frame 3 is subjected to an outward pulling force, and the bearing bracket 4 provides an inward pulling force, so that the force on the anchor chain fixing frame 3 is balanced to avoid the anchor chain The fixed frame 3 is twisted and deformed due to uneven force; the bearing 41 is assembled on the generator 5 to prevent the radial movement of the generator 5; the installation directions of the upper impeller 7 and the lower impeller 8 are opposite, and the water Compared with other media, the tidal current can provide a larger rotational torque to the blades, and the self-starting performance is good; no matter which direction the hydraulic force can bear, the total time of the blades of the lower impeller 8 and the upper impeller 7 Can be in a force-bearing position, so no matter how the hydraulic direction changes, the upper impeller 7 and the lower impeller 8 are guaranteed to rotate; the upper impeller 7 is installed on the first rotating shaft 6, and when the current passes through the upper impeller 7, the hydraulic force pushes the blades Rotate, and drive the first rotating shaft 6 to rotate together at the same time, and then make the rotor on the first rotating shaft 6 move synchronously; The described lower impeller 8 is connected with the stator of the generator 5 through the second rotating shaft 61, when the tidal current energy passes through the lower When the impeller is 8, the lower impeller 8 rotates in the opposite direction to the upper impeller 7, that is, the stator and the rotor of the generator 5 can rotate, and the stator and the rotor are in the opposite direction, and are protected by a waterproof seal; The magnetic field, the stator rotates in the opposite direction to the rotor, essentially cuts the rotating magnetic field to generate induced electromotive force.

The working principle of a tidal energy vertical axis power generation device of the utility model is: under the action of water flow, no matter which direction the water flow flows in, the vertical axis tidal energy power generation device can generate a circumferential moment to the blades, thereby pushing the impeller to rotate , the upper impeller 7 and the lower impeller 8 coaxially rotate in opposite directions, and at the same time drive the stator and rotor of the generator 5 to rotate in opposite directions, the rotating motion of the rotor generates a rotating magnetic field, and the reverse rotation of the stator cuts the magnetic induction lines in the rotating magnetic field Thereby, an induced electromotive force is generated, and the tidal current energy is converted into electrical energy.

The tidal current energy vertical axis power generation device of the present utility model uses the SAVONIUS type blade to overcome the disadvantage of poor self-starting performance of the fixed-angle straight blade. The axis rotates in reverse, it can rotate at a low flow rate, and has good self-starting performance; the upper impeller 7 and the lower impeller 8 are coaxial and reversed, and the torques cancel each other out, which improves the stability of the device and improves the connection device 9 working conditions; the stator and the rotor rotate in opposite directions, which increases the relative motion speed between the two and improves the power generation efficiency; the impeller of the vertical axis tidal current energy generation device has an upper and lower double impeller type, and is directly connected with the stator and the rotor , eliminating the need for complex gear transmission mechanisms and other mechanical components, simplifying the mechanical structure and prolonging the service life.

Example 2

Please refer to FIG. 5 . FIG. 5 is a schematic structural diagram of another vertical-axis tidal current energy generating device of the present invention. This embodiment is basically the same as Embodiment 1, the difference is that there is no anchor chain fixing frame 3, bearing bracket 4, and bearing 41 in this embodiment, and the whole device is simple in structure and easy to operate; the whole device is placed under the object floating on the water surface , such as a ship. During use, pull down anchor chain fixing frame 3, it is fixed on the below of buoyant body again.

Example 3

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of another vertical-axis tidal current energy generating device of the present invention. This embodiment is basically the same as Embodiment 1, the difference is that in this embodiment, a total of two vertical axis power generation devices are selected, and the array is placed on the seabed where the tidal current energy passes to form a power field, wherein the number of vertical axis power generation fields in the array is different. Limitations and the number in this embodiment, the number of vertical axis power generation devices can be selected according to needs. This device can supply power for off-shore and off-grid lighthouses, buoys and other devices, and can also form an array and be fixed on the seabed or lake bottom where the tidal current can pass. Generate electricity and provide clean energy for electrical equipment.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the premise of the utility model method, some improvements and supplements can also be made, and these improvements and supplements also It should be regarded as the protection scope of the present utility model.

Claims (4)

1. a vertical-axis tide energy electricity generating device, is characterized in that, described electricity generating device comprises the first pedestal, the second pedestal, generator, upper impeller, lower impeller; Described generator comprises rotor and stator; Described rotor and the coaxial counterrotating of stator; Described rotor is assemblied on the first rotatingshaft; First described rotatingshaft one end is connected with generator, and the other end is connected with upper impeller; The other end of described upper impeller is connected with the first pedestal by connection set; Described generator lower end connects the second rotatingshaft, and second described rotatingshaft one end is connected with stator, and the other end is connected with lower impeller; The described lower impeller the other end is connected with the second pedestal by connection set; Described upper impeller is identical with lower blade wheel structure shape, and upper impeller and lower impeller coaxial line are installed, and wherein go up impeller contrary with lower impeller installation direction; Described upper impeller and lower impeller are SAVONIUS type blade; Described blade comprises concave-blade and convex surface blade, and wherein the overlap ratio S/D of concave-blade and convex surface blade is fixed as 0.2; Described concave-blade and convex surface blade are Integratively formed; Described concave-blade and convex surface smooth blade surface; The concave-blade of described upper impeller is corresponding with the convex surface blade of lower impeller, and the convex surface blade of upper impeller is corresponding with the concave-blade of lower impeller.

2. electricity generating device according to claim 1, is characterized in that, the number of blade of described upper impeller and lower impeller is 2.

3. electricity generating device according to claim 1, is characterized in that, described electricity generating device also comprises anchor chain fixing frame, bearing supporting frame; Fix riveted joint between described first pedestal and the second pedestal and have 4 anchor chain fixing frames, described anchor chain fixing frame connection bearing support; Described bearing bracket is fixedly connected with the outer wall of bearing; Described bearing inner wall is fixedly connected with generator by screw.

4. electricity generating device according to claim 3, is characterized in that, the quantity of described electricity generating device is at least one.