A fish tail type tidal current power generation device

Abstract

The application discloses a fish tail type tidal current energy power generation device, which solves the problem that the existing tidal current energy power generation device cannot be effectively applied to the near-shore shallow sea area, has the advantages of large sweeping area and high power generation efficiency, and has the technical scheme that the device comprises a first swing energy absorbing mechanism and a second swing energy absorbing mechanism; the first swing energy absorbing mechanism comprises a first cross arm, the end of the first cross arm is hinged to a first hydrofoil, and the first cross arm is connected with a first hydraulic pump and a first air pump; the second swing energy absorbing mechanism comprises a second cross arm, the end of the second cross arm is hinged to a second hydrofoil, and the second cross arm is connected with a second hydraulic pump and a second air pump; the first hydraulic pump is connected with a second hydraulic motor, the second hydraulic motor is connected with the second hydrofoil, and the second hydraulic motor drives the second hydrofoil to swing along the hinged position of the second cross arm; the second hydraulic pump is connected with a first hydraulic motor, the first hydraulic motor is connected with the first hydrofoil, and the first hydraulic motor drives the first hydrofoil to swing along the hinged position of the first cross arm.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tidal current energy power generation, in particular to a fish tail type tidal current energy power generation device. BACKGROUND

[0002] The rapid development of society requires more and more energy, which will inevitably cause serious energy crisis. At the same time, the overexploitation and utilization of traditional energy cause serious air pollution (such as haze) and natural environment destruction. In the new era, actively developing clean and renewable energy has become the international consensus. The research and development of solar energy, wind energy, geothermal energy, ocean energy, biomass energy and hydropower, nuclear power are the most rapid. New energy and renewable energy will become one of the fastest growing new industries in the world.

[0003] Ocean energy is one of the important renewable energies. About 70% of the global area of the ocean contains rich renewable energy, mainly in the form of wave energy, tidal current energy, tidal energy, temperature difference energy and so on. Tidal phenomenon is the regular movement of seawater due to the gravitational effect of the sun and the moon, and the horizontal flow is tidal current. The area with the most concentrated tidal current energy resources is the strait, narrow waterway and the entrance of the bay. The development of tidal current energy does not need to build dams in the sea, does not occupy farmland and coastline, does not significantly change the natural path of water flow, and has less impact on the marine environment, which has good environmental and social benefits.

[0004] At present, there are three common forms of tidal current energy power generation principles: horizontal axis water turbine, vertical axis water turbine and oscillation type energy harvesting device.

[0005] The rotating shaft of the horizontal axis water turbine is parallel to the direction of water flow, and the power generation power is large. When the direction of water flow has an angle with the direction of rotating shaft, the energy harvesting efficiency decreases rapidly, and a yaw control system is generally needed to be installed to adjust to improve the power generation output power. The blade design of the water turbine is a complex technology, which is closely related to the processing technology of the water turbine, the variable pitch mechanism and the operation strategy. The horizontal axis water turbine has the advantages of compact structure, high efficiency and stable unit output power; the disadvantages are complex blade structure, high strength requirement, easy cavitation, difficulty in underwater sealing of generator and variable pitch mechanism, and high cost.

[0006] The rotating shaft of the vertical axis water turbine is perpendicular to the horizontal plane, and its operation is not affected by the direction of water flow, which not only reduces the design of the yaw control system, but also can output the captured energy directly through the torque of the rotating shaft, reducing the loss of mechanical transmission. According to the structure of the blade, the vertical axis water turbine blade can be divided into straight blade type and spiral type. The vertical axis water turbine has the advantages of simple blade structure, easy processing, low working speed ratio and not easy to cavitate; the disadvantages are that the impeller structure is not compact, the efficiency is slightly low, the self-starting ability is weak, and the water power load is unstable.

[0007] The oscillation type energy harvesting device is based on the water wings oscillating up and down in the vertical plane under the action of water flow lift. Compared with the axial flow or cross flow impeller technology, the oscillation water wing technology has advantages in energy capture and power generation in shallow water, so the application field is wider.

[0008] The current tidal current power generation principles including horizontal axis water turbine, vertical axis water turbine and oscillation type energy harvesting device are not suitable for relatively shallow nearshore waters. In summary, there is still a lack of effective solutions to the problem that the existing technology cannot effectively generate power in nearshore shallow waters. SUMMARY

[0009] In order to overcome the deficiencies of the prior art, the present application provides a fishtail type tidal current power generation device, which is a horizontal oscillation type energy harvesting device suitable for nearshore shallow waters, and has the advantages of large sweeping area and high power generation efficiency.

[0010] Further, the application adopts the following technical solutions:

[0011] A fishtail type tidal current power generation device, comprising a first swing energy absorption mechanism and a second swing energy absorption mechanism, the first swing energy absorption mechanism and the second swing energy absorption mechanism rotate around the same stand; the first swing energy absorption mechanism comprises a first cross arm, the end of the first cross arm is hinged with a first water wing, and the first cross arm is connected with a first hydraulic pump and a first air pump; the second swing energy absorption mechanism comprises a second cross arm, the end of the second cross arm is hinged with a second water wing, and the second cross arm is connected with a second hydraulic pump and a second air pump; the first hydraulic pump is connected with a second hydraulic motor, the second hydraulic motor is connected with the second water wing, and the second hydraulic motor drives the second water wing to swing along the hinged part of the second cross arm; the second hydraulic pump is connected with a first hydraulic motor, the first hydraulic motor is connected with the first water wing, and the first hydraulic motor drives the first water wing to swing along the hinged part of the first cross arm; the first air pump and the second air pump are both communicated with a gas storage device through pipelines, and the gas storage device is connected with a generator.

[0012] Further, the first cross arm and the second cross arm have a set included angle, and the first water wing and the second water wing have a set phase difference.

[0013] Further, the first hydraulic pump and the second hydraulic motor are communicated through a hydraulic pipeline, and the second hydraulic pump and the first hydraulic motor are communicated through a hydraulic pipeline, realizing linkage of the two water wings.

[0014] Further, the first swing energy absorption mechanism and the second swing energy absorption mechanism are arranged adjacently on the outside of the stand.

[0015] Further, the first hydraulic pump, the first air pump, the second hydraulic pump and the second air pump are arranged inside the stand and can rotate around the central axis of the stand.

[0016] Further, the first cross arm and the second cross arm are swingable around the column.

[0017] Further, the column top is provided with a flow velocity meter, the flow velocity meter is connected with the controller, and the controller is connected with the first hydraulic motor and the second hydraulic motor.

[0018] Further, the column bottom is fixedly connected with the base, and a reinforcing rod is further arranged between the column and the base.

[0019] Further, the first water wing and the second water wing are both in the shape of a shuttle.

[0020] Further, the swing angle range of the first water wing and the second water wing is -75°-75°.

[0021] Further, the swing angle range of the first cross arm and the second cross arm is -45°-45°.

[0022] Compared with the prior art, the power generation device has the beneficial effects that:

[0023] The first cross arm and the second cross arm swing around the column under the action of water flow, and then drive the air pump and the hydraulic pump to move, the hydraulic pump drives the water wing to perform a bionic fish tail pitching motion through the hydraulic motor, and the high-pressure gas of the air pump is provided to the generator through the gas storage device to generate electricity; the oscillating water wing motion in the device is a coupled motion composed of horizontal cross arm swing and water wing swing, the water wing performs left and right oscillating motion under the action of water flow, converts the flow kinetic energy of water flow into mechanical energy of left and right oscillating of the cross arm, and thus realizes the energy capture of tidal current energy, and is more suitable for tidal current energy power generation in near-shore shallow sea areas.

[0024] The power generation device is provided with double water wings, the hydraulic pumps of the two water wings are connected through hydraulic pipes between the hydraulic motors, the two water wings have a phase difference in swing, the two water wings can realize linkage, when one water wing is at a mechanical dead point, the other water wing (not at the dead point) can be driven to cross the dead point by using the force of the other water wing, the continuity of the oscillating motion of the water wing is ensured, the influence of the dead point on the oscillating motion is eliminated, and the power generation system has good self-maintenance and self-starting performance and stability of total energy capture instantaneous power. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Embodiments of the application, and

[0026] Figure 1 Structure diagram of the power generation device of the present application;

[0027] Figure 2 Energy flow diagram of the power generation device of the present application;

[0028] Figure 3 Connection diagram of the first hydraulic motor and the second hydraulic pump;

[0029] Figure 4 Connection diagram of the second hydraulic motor and the first hydraulic pump;

[0030] Figure 5 Phase diagram of the oscillating hydrofoil;

[0031] Figure 6 Diagram of the fish tail left and right swing;

[0032] In the drawings, 1 - first air pump; 2 - first hydraulic pump; 3 - second hydraulic pump; 4 - second air pump; 5 - stand; 6 - reinforcing rod; 7 - base; 8 - second hydrofoil; 9 - second hydraulic motor; 10 - second cross arm; 11 - first hydraulic motor; 12 - first hydrofoil; 13 - first cross arm; 14 - flow meter. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0034] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should also be noted that, as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] As introduced in the background, the prior art has the problem that tidal current power generation cannot be effectively applied to near-shore shallow water areas. In order to solve the above technical problem, the present application proposes a fish tail type tidal current power generation device.

[0036] In a typical embodiment of the present application, as Figures 1-6As shown, a fish tail type tidal current power generation device is provided, comprising a first swing energy absorbing mechanism and a second swing energy absorbing mechanism, the first swing energy absorbing mechanism and the second swing energy absorbing mechanism rotate around the same stand column 5; the first swing energy absorbing mechanism comprises a first cross arm 13, the end of the first cross arm 13 is hinged with a first hydrofoil 12, the first cross arm 13 is connected with a first hydraulic pump 2 and a first air pump 1, the second swing energy absorbing mechanism comprises a second cross arm 10, the end of the second cross arm 10 is hinged with a second hydrofoil 8, the second cross arm 10 is connected with a second hydraulic pump 3 and a second air pump 4; the first hydraulic pump 2 is connected with a second hydraulic motor 9, the second hydraulic motor 9 is connected with the second hydrofoil 8, the second hydraulic motor 9 drives the second hydrofoil 8 to swing along the hinged part of the second cross arm 10; the second hydraulic pump 3 is connected with a first hydraulic motor 11, the first hydraulic motor 11 is connected with the first hydrofoil 12, the first hydraulic motor 11 drives the first hydrofoil 12 to swing along the hinged part of the first cross arm 13; the first air pump 1 and the second air pump 4 are both communicated with a gas storage device through pipelines, the gas storage device is connected with a generator; the water foil of the present application swings left and right, pushes the air pump, outputs high pressure air, and the high pressure air can be stored in a tank or a large underground closed cavity or cave. High pressure air can be used for power generation, or directly as mechanical power.

[0037] The water foil of the present application swings left and right, and the bionic fish tail effect is achieved, like Figure 6 As shown, the fish swims forward by swinging the fish tail left and right.

[0038] The first cross arm 13 and the second cross arm 10 have a set included angle, and the first hydrofoil 13 and the second hydrofoil 10 have a set phase difference.

[0039] The first hydraulic pump 2 and the second hydraulic motor 9 are communicated through a hydraulic pipeline, the second hydraulic pump 3 and the first hydraulic motor 11 are communicated through a hydraulic pipeline, so that the two hydrofoils are linked. When one hydrofoil is at a mechanical dead point, the force of the other hydrofoil (not at the dead point) can be used to drive it to pass the dead point.

[0040] The first swing energy absorbing mechanism and the second swing energy absorbing mechanism are arranged adjacently above and below outside the stand column 5.

[0041] The first hydraulic pump 2, the first air pump 1, the second hydraulic pump 3 and the second air pump 4 are arranged inside the stand column 5 and can rotate around the central axis of the stand column 5.

[0042] The first hydrofoil 12 and the second hydrofoil 8 are both in the shape of a shuttle. The first hydrofoil 12 and the second hydrofoil 8 are symmetrical hydrofoils of the same airfoil type.

[0043] In space, the two hydrofoils are arranged vertically above and below. The oscillation movement of each hydrofoil is a combination of the cross arm swing β(t) and the hydrofoil swing α(t) movement around the stand column.

[0044] In the present application, the oscillating hydrofoil movement is a coupled movement composed of horizontal direction cross arm swing beta (t) and hydrofoil swing alpha (t). The hydrofoil oscillates left and right under the action of water flow, converting the flow kinetic energy of water flow into mechanical energy of cross arm swing left and right, thereby realizing the energy capture of tidal current energy. The hydrofoil swing alpha (t) and the cross arm swing beta (t) are simple harmonic motions of the same frequency. The swing of the second cross arm 10 and the swing of the second hydrofoil 8 are beta1 (t) and alpha1 (t) respectively; the swing of the first cross arm 13 and the swing of the first hydrofoil 12 are beta2 (t) and alpha2 (t) respectively.

[0045] The phase difference of the swing of the two hydrofoils causes the coupling between the two hydrofoils. When a hydrofoil is at the dead point position, the instantaneous power of the energy capture is zero, and the other hydrofoil will drive the swing to cross the dead point. At the same time, the stability of the total instantaneous power of the energy capture system is ensured.

[0046] The phase difference of the swing of the two hydrofoils is Phi = pi / 2. 2 , see Figure 5 , the motion law expression of the swing of the cross arm and the swing of the hydrofoil is:

[0047] alpha1 (t) = alpha0 sin (2 pi ft + phi) (1);

[0048] beta1 (t) = beta0 sin (2 pi ft + psi + phi) (2);

[0049] alpha2 (t) = alpha0 sin (2 pi ft) (3);

[0050] beta2 (t) = beta0 sin (2 pi ft + psi) (4).

[0051] Further, in the process of swing, when the chord line of the hydrofoil is parallel to the direction of the incoming flow, the geometric angle of attack of the hydrofoil is zero, and the swing force in the horizontal direction of the hydrofoil is zero. The point is the dead point position, see Figure 5 When the hydrofoil is at the dead point position, the swing force of the hydrofoil in the horizontal direction is zero, which leads to the low position of the output hydraulic / pneumatic system pressure, which is difficult to drive the swing of the hydrofoil, which leads to the final inability of the hydrofoil to perform oscillating movement. The principle of double hydrofoil linkage tidal current energy capture used in the present application can effectively utilize the energy captured by the swing of a hydrofoil to drive the swing of another hydrofoil during operation, ensuring the continuity of the oscillating movement of the hydrofoil. At the same time, the influence of the dead point on the oscillating movement is eliminated, and the self-sustaining and self-starting performance of the energy capture and power generation system is ensured.

[0052] In the present application, the double hydrofoil energy capture system uses the energy captured by the system to drive the control of the swing of the hydrofoil, overcomes the dead point position, and realizes the sustainable oscillating movement without external driving.

[0053] Further, the coupled motion of the swing of the cross arm beta(t) and the swing of the hydrofoil alpha(t) is realized by Figures 3-4 The first cross arm 13 is connected with the first hydraulic pump 2. The second cross arm 10 is connected with the second hydraulic pump 3. The high-pressure hydraulic oil generated by the first hydraulic pump 2 drives the second hydraulic motor 9 to rotate, and the second hydraulic motor 9 drives the second hydrofoil 8 to swing reciprocatingly. The high-pressure hydraulic oil generated by the second hydraulic pump 3 drives the first hydraulic motor 11 to rotate, and the first hydraulic motor 11 drives the first hydrofoil 12 to swing reciprocatingly.

[0054] The first cross arm 13 and the second cross arm 10 swing along the stand 5. Under the action of the water flow, the first hydrofoil generates a moment for swinging the first cross arm around the stand, and the second hydrofoil generates a moment for swinging the second cross arm around the stand. The first cross arm drives the first hydraulic pump to rotate around the stand, the second cross arm drives the second hydraulic pump to rotate around the stand, the first hydraulic pump drives the second hydraulic motor, and the second hydraulic pump drives the first hydraulic motor. Under the action of the first hydraulic motor and the second hydraulic motor, the attack angles of the two hydrofoils change reciprocatingly, and therefore the moments acting on the two cross arms also change reciprocatingly, so as to generate the reciprocating swing of the cross arms.

[0055] The stand 5 is provided with a flowmeter 14 at the top.

[0056] The stand 5 is fixedly connected with the base 7, and a reinforcing rod 6 is further arranged between the stand 5 and the base 7.

[0057] The swing angle of the first hydrofoil 12 and the second hydrofoil 8 ranges from -75° to 75°.

[0058] The swing angle of the first cross arm 13 and the second cross arm 10 ranges from -45° to 45°.

[0059] The specific working principle of the present application is as follows:

[0060] In the starting position, the second hydrofoil 8 and the first hydrofoil 12 both have a power-capturing effect (neither is at the dead point position), and the phase difference is Φ = π / 2. Under the action of the water flow, the second hydrofoil 8 generates lift and swings around the stand column 5, driving the second air pump 4 and the second hydraulic pump 3 to move; the first hydrofoil 12 swings around the stand column 5, driving the first air pump 1 and the first hydraulic pump 2 to move. The high-pressure hydraulic oil generated by the first hydraulic pump 2 drives the second hydraulic motor 9 to rotate, driving the second hydrofoil 8 to pitch, so that the angle of attack of the second hydrofoil 8 can be changed according to the water flow conditions provided by the flowmeter 14. The controller will calculate the stall angle of the hydrofoil at this flow rate according to the flow rate data provided by the flowmeter, and send instructions to the second hydraulic motor 9 to make the second hydraulic motor 9 drive the second hydrofoil 8 to pitch with an amplitude less than the stall angle at this speed. The high-pressure hydraulic oil generated by the second hydraulic pump 3 drives the first hydraulic motor 11 to rotate, driving the first hydrofoil 12 to pitch, so that the angle of attack of the first hydrofoil 12 can be changed according to the water flow conditions provided by the flowmeter 14. The controller will calculate the stall angle of the hydrofoil at this flow rate according to the flow rate data provided by the flowmeter, and send instructions to the first hydraulic motor 11 to make the first hydraulic motor 11 drive the first hydrofoil 12 to pitch with an amplitude less than the stall angle at this speed. The high-pressure gas generated by the first air pump 1 and the second air pump 4 can be stored in a tank or a closed cavity or a rock cave. The stored high-pressure gas can be used as mechanical power or drive a generator to generate electricity as needed, thereby realizing the conversion of tidal current energy captured by the hydrofoil into mechanical power or electrical energy. Since the second hydrofoil 8 and the first hydrofoil 12 have a phase difference of Φ = π / 2, the second hydrofoil 8 and the first hydrofoil 12 do not simultaneously have an angle of attack of zero, so that the hydrofoil with a non-zero angle of attack can drive the hydrofoil with a zero angle of attack to pass through the dead point.

[0061] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fish-tail type tidal current power generation device, characterized by, The first swing energy absorbing mechanism and the second swing energy absorbing mechanism rotate around the same stand; the first swing energy absorbing mechanism comprises a first cross arm, the end of which is hinged to a first hydrofoil, and the first cross arm is connected to a first hydraulic pump and a first air pump; the second swing energy absorbing mechanism comprises a second cross arm, the end of which is hinged to a second hydrofoil, and the second cross arm is connected to a second hydraulic pump and a second air pump; the first hydraulic pump is connected to a second hydraulic motor, the second hydraulic motor is connected to the second hydrofoil, and the second hydraulic motor drives the second hydrofoil to swing along the hinged part of the second cross arm; the second hydraulic pump is connected to a first hydraulic motor, the first hydraulic motor is connected to the first hydrofoil, and the first hydraulic motor drives the first hydrofoil to swing along the hinged part of the first cross arm; the first air pump and the second air pump are both connected to a gas storage device through pipelines, and the gas storage device is connected to a generator; Under the action of water flow, the first hydrofoil generates a moment that makes the first cross arm swing around the stand, the second hydrofoil generates a moment that makes the second cross arm swing around the stand, and then drives the air pump and the hydraulic pump to move, the hydraulic pump drives the hydrofoil to perform a bionic fish tail pitching motion through a hydraulic motor, and the high-pressure gas of the air pump is provided to the generator through the gas storage device to generate electricity. The swing angle range of the first hydrofoil and the second hydrofoil is -75°-75°, and the phase difference of the swing of the first hydrofoil and the second hydrofoil is .

2. The power generation device of claim 1, wherein The first hydraulic pump and the second hydraulic motor are connected through a hydraulic pipeline, and the second hydraulic pump and the first hydraulic motor are connected through a hydraulic pipeline.

3. The power generation device of claim 1, wherein The first swing energy absorbing mechanism and the second swing energy absorbing mechanism are arranged adjacently on the outside of the stand.

4. The power generation device of claim 1, wherein The first hydraulic pump, the first air pump, the second hydraulic pump and the second air pump are arranged in the inside of the stand and can rotate around the central axis of the stand.

5. The power generation device of claim 1, wherein The top of the stand is provided with a flow velocity meter, the flow velocity meter is connected to a controller, and the controller is connected to the first hydraulic motor and the second hydraulic motor.

6. The power generation device of claim 1, wherein The bottom of the stand is fixedly connected to a base, and a reinforcing rod is arranged between the stand and the base.

7. The power generation device of claim 1, wherein The first hydrofoil and the second hydrofoil are both in the shape of a shuttle.

8. The power generation device of claim 1, wherein The swing angle of the first cross arm and the second cross arm ranges from -45° to 45°.

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