A flow-induced vibration power generator with controllable vibration magnitude

Abstract

The present invention discloses a flow-induced vibration power generation vibrator with controllable vibration size. The vibrator consists of two end plates and three vibrators. Each of the vibrators is a regular triangular prism structure of the same size. A sliding shaft running through the top and bottom of the vibrator is provided at the center of gravity of each vibrator. Slide grooves 120° to each other are provided on the opposite surfaces of the two end plates around the geometric center of the end plates. The sliding shafts at both ends of each vibrator are embedded in the slide grooves to form a sliding connection. Two vibrators are arranged upstream of the water flow direction and one vibrator is arranged downstream. All the vibrators are arranged with one side perpendicular to the water flow direction, and the top angle of each vibrator opposite to the side perpendicular to the water flow direction is facing the downstream direction.

Description

Technical Field

[0001] The present application relates to the fields of offshore new energy, ocean current power generation, and fluid mechanics, and is a form of flow-induced vibration power generation vibrator that can realize vibration size control. Background Art

[0002] Global ocean currents are widely distributed and have huge reserves. The exploitable ocean current energy exceeds 6×10 6 MW. Flow-induced vibration power generation, as a cutting-edge technology for ocean current power generation, has significant advantages such as high energy density, low starting flow velocity, no occupation of arable land, and no impact on navigation. It uses ocean currents to induce oscillator vibration to capture energy and has good application prospects.

[0003] At present, there are many studies on the shape of flow-induced vibration power generation vibrators, the purpose of which is to increase the vibration intensity and thus obtain more fluid kinetic energy. Among them, some non-circular cross-section vibrators, due to their non-axisymmetric cross-section characteristics, will experience galloping under high flow conditions. They have a larger amplitude and can better achieve energy conversion. However, due to the large amplitude and the continuous increase in the amplitude of the vibrator as the flow velocity increases, it is easy for the vibration amplitude to exceed the vibration limit. Once the limit is exceeded, it is easy to cause destructive safety accidents. For this reason, it is necessary to propose a structure or method suitable for suppressing flow-induced vibration or shutdown. At this stage, the methods that can be used are mostly to increase the system load, forcing the system damping to increase, thereby suppressing vibration. This method mostly relies on automatic control equipment. If a simpler method can be provided, it will not only increase double safety protection, but also have certain economic benefits. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a flow-induced vibration power generation vibrator that can control the vibration magnitude in order to achieve vibration suppression and emergency shutdown effects based on the characteristics of flow-induced vibration power generation.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A flow-induced vibration power generation vibrator with controllable vibration size consists of two end plates and three vibrators, each of which is a regular triangular prism structure of the same size. A sliding shaft running through the top and bottom of the vibrator is provided at the center of gravity of each vibrator, and sliding grooves 120° to each other are provided on the opposite surfaces of the two end plates around the geometric center of the end plates. The sliding shafts at both ends of each vibrator are embedded in the sliding grooves to form a sliding connection. Two vibrators are arranged upstream of the water flow direction and one vibrator is arranged downstream. All vibrators are arranged with one side perpendicular to the water flow direction, and the top angle of each vibrator opposite to the side perpendicular to the water flow direction is facing downstream.

[0007] Furthermore, the vibrator is made of one of steel, aluminum alloy, plastic, and organic glass.

[0008] Furthermore, the side length of the vibrator is 8 cm to 25 cm, and the length perpendicular to the water flow direction is 8 to 12 times the side length.

[0009] Furthermore, the cross-sectional shape of the end plate is circular or square, the cross-sectional size is 4 to 6 times the side length of the vibrator, the thickness is 1 to 2 cm, and it is made of one of steel, aluminum alloy, plastic, and organic glass.

[0010] Furthermore, the end plate is connected to the transmission structure of the flow-induced vibration power generation system, transmitting the vibration of the three vibrators to the power generation system to achieve energy conversion.

[0011] Furthermore, the length of the chute is equal to the side length of the vibrator, and the three vibrators can slide synchronously radially inward or outward along the three chute around the geometric center of the end plate, and during the sliding process, the angles of the three vibrators relative to the water flow direction remain unchanged.

[0012] Furthermore, when the vibration needs to be increased, the three vibrators are synchronously concentrated toward the center through the sliding axis, eventually forming an integral triangular prism. When the water flows through the integral triangular prism composed of the three vibrators, vortex shedding is alternately generated above and below the integral triangular prism, eventually driving each vibrator to vibrate up and down synchronously, increasing the vibration intensity and improving the energy utilization effect.

[0013] Furthermore, when the machine is shut down or vibration needs to be reduced, the three vibrators slide outward synchronously through the sliding shaft, forming a Y-shaped flow channel in the middle of the three vibrators. When the water flows through the two upstream vibrators, vortices will be generated at the sharp corners of their respective sides. At the same time, the water will flow through the Y-shaped flow channel formed in the middle of the three vibrators, affecting the shedding of the aforementioned vortices, and then affecting the intensity of the vibration, causing the three vibrators to no longer vibrate.

[0014] The present invention also provides a flow-induced vibration power generation vibrator with controllable vibration size, which consists of two end plates and three vibrators. Each of the vibrators is a regular triangular prism structure of the same size. A sliding shaft is provided on the top and bottom of each vibrator from the center of gravity to one of the vertex angles. Slide grooves 120° to each other are provided on the opposite surfaces of the two end plates around the geometric center of the end plates. The sliding shafts at both ends of each vibrator are embedded in the slide groove to form a sliding connection. Two vibrators are arranged upstream of the water flow direction and one vibrator is arranged downstream. All the vibrators are arranged with one side perpendicular to the water flow direction, and the vertex angle of each vibrator opposite to the side perpendicular to the water flow direction is facing the downstream direction.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0016] The flow-induced vibration power generation vibrator provided by the present invention is composed of three synchronously sliding regular triangular prism vibrators. First, the three regular triangular prism vibrators are concentrated and tightened inward to form a complete large regular triangular prism, so that the vibration can exhibit typical galloping phenomenon, with a large amplitude and a large potential for vibration energy conversion; secondly, after the three regular triangular prisms spread outward, the natural Y-shaped flow channel formed will hinder the shedding of vortices generated by the upper and lower vibrators, thereby achieving the effect of suppressing vibration; thirdly, the three regular triangular prisms can slide quickly inside the slide groove. When encountering an emergency, the vibrator can respond quickly, and the vibration control and emergency shutdown can be achieved by the vibrator whose cross-sectional shape can change, thereby reducing the amplitude and ensuring the safety of the equipment; in addition, the structure of the above-mentioned vibrator, slide groove, and slide shaft is very simple, easy to operate and implement, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic cross-sectional view of a flow-induced vibration power generator with controllable vibration magnitude in working state;

[0018] Figure 2 A schematic cross-sectional view of a flow-induced vibration power generation vibrator with controllable vibration magnitude in a stopped state;

[0019] Figure 3 A cross-sectional diagram of a flow-induced vibration power generator with controllable vibration magnitude in working state (wake flow shape);

[0020] Figure 4 A schematic cross-sectional view of a flow-induced vibration generator with controllable vibration magnitude in a stopped state (wake flow morphology);

[0021] In the figure, 1A-oscillator A; 1B-oscillator B; 1C-oscillator C; 2A-sliding shaft A; 2B-sliding shaft B; 2C-sliding shaft C; 3A-chute A; 3B-chute B; 3C-chute C; 4-end plate; 5-water flow; 6-vortex. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides a flow-induced vibration power generation vibrator with controllable vibration magnitude, comprising three vibrators 1A, 1B, and 1C, slide shafts 2A, 2B, and 2C, chutes 3A, 3B, and 3C, and an end plate 4. The vibrators 1A, 1B, and 1C are identical regular triangular prisms with a cross-sectional side length of 10 cm and a length perpendicular to the water flow direction of 1 meter, and can be made of steel.

[0025] Sliding shafts 2A, 2B, and 2C that pass through the top and bottom of the three vibrators 1A, 1B, and 1C are set at the center of gravity of the three vibrators 1A, 1B, and 1C, that is, the center of the cross-section at both ends perpendicular to the water flow direction. The sliding shafts 2A, 2B, and 2C are fixedly connected to the vibrators 1A, 1B, and 1C respectively.

[0026] End plates 4 are arranged at both ends of the three vibrators 1A, 1B, and 1C perpendicular to the water flow direction. The cross-sectional shape of the end plate 4 can be circular, with a cross-sectional radius of 20 cm and a thickness of 1 cm. The material is steel. The end plate 4 is connected to the transmission structure of the flow-induced vibration power generation system; three chutes 3A, 3B, and 3C are arranged inside the end plate 4, with a length of 10 cm. The three vibrators 1A, 1B, and 1C are constrained to slide in the chutes by sliding shafts 2A, 2B, and 2C; the three vibrators 1A, 1B, and 1C and the three chutes 3A, 3B, and 3C are arranged radially at equal intervals around the geometric center of the end plate 4; the axes of the three chutes are 120° to each other.

[0027] Specifically, two vibrators 1A and 1C are arranged upstream, and 1B is arranged downstream; the three vibrators 1A, 1B, and 1C are arranged with one of their bottom edges perpendicular to the water flow direction, and the top angles of the three vibrators 1A, 1B, and 1C opposite to the side edges perpendicular to the water flow direction are directed toward the downstream direction; the three vibrators 1A, 1B, and 1C can slide radially inward and outward synchronously along the three chutes 3A, 3B, and 3C around the geometric center of the end plate 4, but no matter how they slide, the angles of the three vibrators relative to the water flow direction 5 do not change.

[0028] See Figure 3 and Figure 4 Specifically, when the vibration needs to be increased, the three vibrators 1A, 1B, and 1C are synchronously concentrated toward the center through the sliding shafts 2A, 2B, and 2C, and finally form an integral triangular prism. When the water flow 5 passes through the vibrators 1A, 1B, and 1C, vortices 6A, 6B, and 6C are alternately generated above and below them and fall off, eventually driving the vibrators 1A, 1B, and 1C to vibrate synchronously up and down, resulting in high vibration intensity and excellent energy utilization effect.

[0029] When the machine is shut down or other situations require vibration reduction, the three vibrators 1A, 1B, and 1C slide outward synchronously through the sliding shafts 2A, 2B, and 2C, forming a Y-shaped flow channel among the three vibrators 1A, 1B, and 1C. When the water flow 5 passes through the vibrators 1A and 1C, vortices 6A and 6B are generated at the sharp corners. However, at the same time, the water flow 5 will flow through the Y-shaped flow channel formed among the vibrators 1A, 1B, and 1C, thereby affecting the shedding of the vortices 6A and 6B, and further affecting the intensity of the vibration, causing the vibrators 1A, 1B, and 1C to no longer vibrate and no electrical energy to be utilized.

[0030] In this embodiment, the vibrator is suitable for a flow velocity range of 0.2 to 1.5 m / s, and the maximum power can reach 100 W.

[0031] Example 2

[0032] This embodiment provides a flow-induced vibration power generation vibrator with controllable vibration amplitude, comprising three vibrators 1A, 1B, and 1C, a sliding shaft, chutes 3A, 3B, and 3C, and an end plate 4. Vibrators 1A, 1B, and 1C are identical regular triangular prisms, each with a side length of 10 cm and a length perpendicular to the water flow of 1 meter. They can be made of steel.

[0033] Sliding shafts are provided at the top and bottom of the three vibrators 1A, 1B, and 1C from the center of gravity to one of the top corners, and the sliding shafts are fixedly connected to the vibrators 1A, 1B, and 1C respectively.

[0034] End plates 4 are arranged at both ends of the three vibrators 1A, 1B, and 1C perpendicular to the water flow direction. The cross-sectional shape of the end plate 4 can be circular, with a cross-sectional radius of 20 cm and a thickness of 1 cm. The material is steel. The end plate 4 is connected to the transmission structure of the flow-induced vibration power generation system; three chutes 3A, 3B, and 3C are arranged inside the end plate 4, with a length of 10 cm. The sliding shafts at both ends of the three vibrators 1A, 1B, and 1C are embedded in the chutes 3A, 3B, and 3C to form a sliding connection, and the three vibrators 1A, 1B, and 1C are constrained to slide in the chutes through the sliding shafts; the three vibrators 1A, 1B, and 1C and the three chutes 3A, 3B, and 3C are arranged radially at equal intervals around the geometric center of the end plate 4; the axes of the three chutes are 120° to each other.

[0035] Specifically, two vibrators 1A and 1C are arranged upstream, and 1B is arranged downstream; the three vibrators 1A, 1B, and 1C are arranged with one of their bottom edges perpendicular to the water flow direction, and the top angles of the three vibrators 1A, 1B, and 1C opposite to the side edges perpendicular to the water flow direction are directed toward the downstream direction; the three vibrators 1A, 1B, and 1C can slide radially inward and outward synchronously along the three chutes 3A, 3B, and 3C around the geometric center of the end plate 4, but no matter how they slide, the angles of the three vibrators relative to the water flow direction 5 do not change.

[0036] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, those skilled in the art may make various specific modifications based on the teachings of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A flow-induced vibration power generator with controllable vibration magnitude, characterized in that: It consists of two end plates and three vibrators, each of which is a regular triangular prism structure of the same size. A sliding shaft passing through the top and bottom of the vibrator is set at the center of gravity of each vibrator, and sliding grooves with an angle of 120° to each other are set on the opposite surfaces of the two end plates around the geometric center of the end plates. The sliding shafts at both ends of each vibrator are embedded in the sliding groove to form a sliding connection. Two vibrators are arranged upstream in the direction of water flow, and one vibrator is arranged downstream. All vibrators are arranged with one side perpendicular to the direction of water flow, and the top angle of each vibrator opposite to the side perpendicular to the direction of water flow is facing downstream; the three vibrators can slide synchronously inward or outward in a radial manner along the three sliding grooves around the geometric center of the end plate, and the angles of the three vibrators relative to the direction of water flow remain unchanged during the sliding process.

2. A flow-induced vibration power generation vibrator with controllable vibration magnitude according to claim 1, characterized in that: The vibrator is made of one of steel, aluminum alloy, plastic and organic glass.

3. A flow-induced vibration power generation vibrator with controllable vibration magnitude according to claim 1 or 2, characterized in that: The side length of the vibrator is 8 cm to 25 cm, and the length perpendicular to the water flow direction is 8 to 12 times the side length.

4. The flow-induced vibration power generator with controllable vibration magnitude according to claim 1, characterized in that: The cross-section of the end plate is circular or square, the cross-section size is 4 to 6 times the side length of the vibrator, the thickness is 1 to 2 cm, and it is made of one of steel, aluminum alloy, plastic, and organic glass.

5. A flow-induced vibration power generation vibrator with controllable vibration magnitude according to claim 1 or 4, characterized in that: The end plate is connected to the transmission structure of the flow-induced vibration power generation system, and transmits the vibration of the three vibrators to the power generation system to achieve energy conversion.

6. The flow-induced vibration power generator with controllable vibration magnitude according to claim 1, characterized in that: The length of the slide groove is equal to the side length of the vibrator.

7. The flow-induced vibration power generator with controllable vibration magnitude according to claim 1, characterized in that: When the vibration needs to be increased, the three vibrators are synchronously concentrated toward the center through the sliding axis, eventually forming an integral triangular prism. When the water flows through the integral triangular prism composed of the three vibrators, vortex shedding is alternately generated above and below the integral triangular prism, eventually driving each vibrator to vibrate up and down synchronously, increasing the vibration intensity.

8. The flow-induced vibration power generator with controllable vibration magnitude according to claim 1, characterized in that: When the machine is shut down or vibration needs to be reduced, the three vibrators slide outward synchronously through the sliding shaft, forming a Y-shaped flow channel in the middle of the three vibrators. When the water flows through the two upstream vibrators, vortices will be generated at the sharp corners of their respective sides. At the same time, the water will flow through the Y-shaped flow channel formed in the middle of the three vibrators, affecting the shedding of the aforementioned vortices, and then affecting the intensity of the vibration, causing the three vibrators to no longer vibrate.

9. A flow-induced vibration power generator with controllable vibration magnitude, characterized in that: It consists of two end plates and three vibrators, each of which is a regular triangular prism structure of the same size. A sliding shaft is set on the top and bottom of each vibrator from the center of gravity to one of the vertex angles. Slide grooves with an angle of 120° to each other are set on the opposite surfaces of the two end plates around the geometric center of the end plates. The sliding shafts at both ends of each vibrator are embedded in the slide groove to form a sliding connection. Two vibrators are arranged upstream in the direction of water flow, and one vibrator is arranged downstream. All vibrators are arranged with one side perpendicular to the direction of water flow, and the vertex angle of each vibrator opposite to the side perpendicular to the direction of water flow faces downstream; the three vibrators can slide synchronously inward or outward in a radial manner along the three slide grooves around the geometric center of the end plate, and the angles of the three vibrators relative to the direction of water flow remain unchanged during the sliding process.

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