An inverted pendulum type frictional power generation device based on flow-induced vibration

Abstract

This invention discloses an inverted pendulum-type triboelectric generator based on flow-induced galloping, comprising an upper friction plate, a lower friction plate, a flow guide channel, a rigid support, a spring, an oscillator, a rotation fulcrum, an upper connecting rod, and a lower connecting rod. The upper and lower friction plates are arranged parallel to each other, with the lower surface of the upper friction plate contacting the upper surface of the lower friction plate. The oscillator is erected within the flow guide channel and is a polygonal prism obtained by removing two corners of the same long side of a cuboid, with the corner-removed end face facing the side where the fluid flows into the flow guide channel. In the initial state, the line connecting the center of gravity of the lower friction plate, the center of gravity of the oscillator, and the axis of the rotation fulcrum is a straight line perpendicular to the bottom surface of the flow guide channel. Using this invention, the power generation efficiency of the triboelectric generator at low flow velocities can be improved, and it has the advantages of simple structure, stability, reliability, and convenient installation.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, specifically relating to an inverted pendulum-type triboelectric power generation device based on flow-induced galloping. Background Technology

[0002] In recent years, using flow-induced vibration for power generation has become a new type of hydroelectric power generation. Under the influence of the incoming flow, alternating vortices appear behind the bluff body, which excites the oscillator to vibrate. Through appropriate methods, the mechanical energy of the oscillator's vibration can be converted into electrical energy, thus realizing flow-induced vibration power generation.

[0003] Utilizing the principle of flow-induced vibration for energy generation is a low-cost ocean current energy generation method suitable for relatively low-flow-velocity environments. Current flow-induced vibration power generation devices are mostly based on cutting magnetic field lines or piezoelectric materials, and their power generation efficiency in low-flow-velocity environments needs further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide an inverted pendulum-type triboelectric generator based on flow-induced galloping, which can improve the vibration intensity and energy utilization of the oscillator, increase the power generation efficiency of the triboelectric generator in low flow velocities, and has the advantages of simple structure, stability and reliability, and convenient installation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An inverted pendulum-type triboelectric generator based on flow-induced galloping includes an upper friction plate, a lower friction plate, a guide channel, a rigid support, a spring, an oscillator, a rotation fulcrum, an upper connecting rod, and a lower connecting rod.

[0007] The upper friction plate is fixedly connected to the top center of the guide channel by the rigid bracket, and the lower friction plate is movably connected to the top center of the guide channel by the spring. The upper friction plate and the lower friction plate are arranged in parallel vertically, and the lower surface of the upper friction plate is in contact with the upper surface of the lower friction plate.

[0008] The pivot point is fixed at the bottom center of the guide channel, and the axis of rotation of the pivot point is perpendicular to the cross-section of the guide channel.

[0009] The vibrator is erected in the flow channel. The vibrator is a polygonal prism obtained by cutting off two corners of the same long side of a cuboid. The end face of the vibrator after cutting off the corners faces the side where the fluid flows into the flow channel. The lower end of the vibrator is fixedly connected to the lower connecting rod, which is rotatably connected to the rotation fulcrum. The upper end of the vibrator is fixedly connected to the upper connecting rod, which is fixedly connected to the lower surface of the lower friction plate.

[0010] In the initial state, the line connecting the center of gravity of the lower friction plate, the center of gravity of the oscillator, and the axis of the rotation fulcrum is a straight line and perpendicular to the bottom surface of the guide groove.

[0011] As a preferred embodiment of the present invention, the angle between the beveled surface of the oscillator after the corners are cut off and its adjacent side surface is 45 degrees.

[0012] As a preferred embodiment of the present invention, the lateral width of the end face of the oscillator after the corners are cut off is 1 / 2 of the maximum lateral width of the oscillator.

[0013] As a preferred embodiment of the present invention, the distance from the wall of the guide channel to the vibrator is 4 to 5 times the maximum lateral width of the vibrator.

[0014] As a preferred embodiment of the present invention, the ratio of the vertical length of the oscillator to the maximum horizontal width of the oscillator is 10:1.

[0015] As a preferred embodiment of the present invention, the assembly pressure between the upper friction plate and the lower friction plate is 5N to 10N.

[0016] As a preferred embodiment of the present invention, the flow channel is provided with two flow guide plates on the side where the fluid flows in, and the two flow guide plates are arranged in a figure-eight pattern.

[0017] As a preferred embodiment of the present invention, the guide plate is connected and fixed to the wall of the guide channel, and the angle between the guide plate and the wall of the guide channel is 45 degrees.

[0018] The advantages of implementing the inverted pendulum-type triboelectric power generation device based on flow-induced galloping provided by this invention compared with the prior art are as follows:

[0019] (1) The structure of the oscillator adopts an asymmetric bluff body, which can excite stronger galloping at low flow rates, thereby obtaining more energy per unit flow rate;

[0020] (2) Combining sliding friction and inverted pendulum structure can improve the stability and reliability of power generation device, and the structure is simple and easy to install. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0022] Figure 1 This is a front view of an inverted pendulum-type triboelectric power generation device based on flow-induced galloping, according to an embodiment of the present invention.

[0023] Figure 2 This is a top view of an inverted pendulum-type triboelectric power generation device based on flow-induced galloping, according to an embodiment of the present invention.

[0024] The diagram shows: 1. Upper friction plate; 2. Lower friction plate; 3. Guide channel; 4. Rigid support; 5. Spring; 6. Vibrator; 7. Rotation fulcrum; 8. Upper connecting rod; 9. Lower connecting rod; 10. Guide plate; 61. Beveled surface of vibrator after corners are removed; 62. End face of vibrator after corners are removed. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] Please refer to the following: Figure 1 and Figure 2 The inverted pendulum-type triboelectric generator based on flow-induced galloping provided in the embodiments of the present invention will now be described.

[0030] like Figure 1 and Figure 2As shown, the inverted pendulum-type triboelectric generator based on flow-induced galloping according to an embodiment of the present invention includes an upper friction plate 1, a lower friction plate 2, a guide channel 3, a rigid support 4, a spring 5, an oscillator 6, a rotation fulcrum 7, an upper connecting rod 8, and a lower connecting rod 9. The upper friction plate 1 is fixedly connected to the top center of the guide channel 3 via the rigid support 4, and the lower friction plate 2 is movably connected to the top center of the guide channel 3 via the spring 5. The upper friction plate 1 and the lower friction plate 2 are arranged parallel to each other vertically, and the lower surface of the upper friction plate 1 contacts and abuts the upper surface of the lower friction plate 2. The rotation fulcrum 7 is fixed to the bottom center of the guide channel 3. The axis of rotation is perpendicular to the cross-section of the guide channel 3; the vibrator 6 is erected inside the guide channel 3. The vibrator 6 is a polygonal prism obtained by cutting off two corners of the same long side of a cuboid. The end face of the vibrator 6 after cutting off the corners faces the side where the fluid flows into the guide channel 3. The lower end of the vibrator 6 is fixedly connected to the lower connecting rod 9, which is rotatably connected to the rotation fulcrum 7. The upper end of the vibrator 6 is fixedly connected to the upper connecting rod 8, which is fixedly connected to the lower surface of the lower friction plate 2. In the initial state, the line connecting the center of gravity of the lower friction plate 2, the center of gravity of the vibrator 6, and the axis of the rotation fulcrum 7 is a straight line and perpendicular to the bottom surface of the guide channel 3.

[0031] In use, the device is first fixed in the water. The upper friction plate 1 of the triboelectric generator is fixed by a rigid bracket 4 to prevent it from rotating. The lower friction plate 2 of the triboelectric generator is fixed by a spring 5 to ensure that the free liquid level is higher than the oscillator 6 and lower than the lower friction plate 2 of the triboelectric generator. The oscillator 6 is constrained to rotate in a specific direction (i.e., lateral oscillation) by a rotation fulcrum 7, so that the upper and lower friction plates of the triboelectric generator always remain facing each other. In addition, the oscillator 6 has an asymmetric blunt body structure, which can generate stronger galloping at low flow rates, thereby obtaining more energy per unit flow rate. Thus, the oscillator 6 can gallop under the action of the incoming flow, and drive the lower friction plate 2 to perform frictional motion relative to the upper friction plate 1, so that the triboelectric generator can do work to generate electrical energy, realizing triboelectric power generation. It can be seen that the inverted pendulum triboelectric generator based on flow-induced galloping in this embodiment, which combines sliding friction and an inverted pendulum structure, can improve the stability and reliability of the triboelectric generator, and has a simple structure and is easy to install.

[0032] It should also be noted that the stiffness of spring 5 can be adjusted according to actual needs, so that the resonant frequency of oscillator 6 is between 1 and 3 Hz, thereby achieving frequency modulation to adapt to the power generation needs under different operating conditions.

[0033] For example, the angle between the beveled surface 61 of the vibrator 6 after the corners are removed and its adjacent side is 45 degrees; the lateral width of the end face 62 of the vibrator 6 after the corners are removed is half of the maximum lateral width of the vibrator 6; the distance from the wall of the guide groove 3 to the vibrator 6 is 4 to 5 times the maximum lateral width of the vibrator 6; the ratio of the vertical length of the vibrator 6 to the maximum lateral width of the vibrator 6 is 10:1. Therefore, by optimizing the shape and parameters of the vibrator 6, the flow field structure around the vibrator 6 can be improved, further enhancing the vibration intensity and energy utilization rate of the vibrator 6, and improving the power generation efficiency of the triboelectric generator.

[0034] For example, the assembly pressure between the upper friction plate 1 and the lower friction plate 2 is 5N to 10N to ensure the friction strength between the upper friction plate 1 and the lower friction plate 2.

[0035] For example, the flow channel 3 has two guide plates 10 on the fluid inflow side, arranged in a figure-eight pattern. Specifically, the guide plates 10 are connected and fixed to the channel wall of the flow channel 3, and the angle between the guide plates 10 and the channel wall of the flow channel 3 is 45 degrees. Thus, under the action of the incoming flow, the figure-eight arranged guide plates 10 can increase the flow velocity between the thin walls, and at the same time change the flow field distribution around the oscillator 6 to promote the vibration of the oscillator 6.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An inverted pendulum-type triboelectric power generation device based on flow-induced galloping, characterized in that, It includes an upper friction plate, a lower friction plate, a guide channel, a rigid support, a spring, an oscillator, a rotating fulcrum, an upper connecting rod, and a lower connecting rod; The upper friction plate is fixedly connected to the top center of the guide channel by the rigid bracket, and the lower friction plate is movably connected to the top center of the guide channel by the spring. The upper friction plate and the lower friction plate are arranged in parallel vertically, and the lower surface of the upper friction plate is in contact with the upper surface of the lower friction plate. The pivot point is fixed at the bottom center of the guide channel, and the axis of rotation of the pivot point is perpendicular to the cross-section of the guide channel. The vibrator is erected in the flow channel. The vibrator is a polygonal prism obtained by cutting off two corners of the same long side of a cuboid. The end face of the vibrator after cutting off the corners faces the side where the fluid flows into the flow channel. The lower end of the vibrator is fixedly connected to the lower connecting rod, which is rotatably connected to the rotation fulcrum. The upper end of the vibrator is fixedly connected to the upper connecting rod, which is fixedly connected to the lower surface of the lower friction plate. In the initial state, the line connecting the center of gravity of the lower friction plate, the center of gravity of the oscillator, and the axis of the rotation fulcrum is a straight line and perpendicular to the bottom surface of the guide groove; Wherein, the angle between the beveled surface of the vibrator after the corners are cut off and its adjacent side is 45 degrees; the lateral width of the end face of the vibrator after the corners are cut off is 1 / 2 of the maximum lateral width of the vibrator.

2. The flow-induced vibration-based inverted pendulum type frictional electric power generation device according to claim 1, characterized by The distance from the wall of the guide channel to the vibrator is 4 to 5 times the maximum lateral width of the vibrator.

3. The flow-induced vibration-based inverted pendulum type frictional electric power generation device according to claim 1, characterized by The ratio of the vertical length of the oscillator to the maximum horizontal width of the oscillator is 10:

1.

4. The flow-induced vibration-based inverted-pendulum-type frictional electric power generation device according to claim 1, characterized by The assembly pressure between the upper friction plate and the lower friction plate is 5N to 10N.

5. The flow-induced vibration-based inverted-pendulum-type frictional electric power generation device according to claim 1, characterized by The flow channel has two flow guide plates on the side where the fluid flows in, and the two flow guide plates are arranged in a figure-eight pattern.

6. The inverted pendulum-type triboelectric power generation device based on flow-induced galloping according to claim 5, characterized in that, The guide plate is fixedly connected to the wall of the guide channel, and the angle between the guide plate and the wall of the guide channel is 45 degrees.

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