Method and device for generating reciprocating mechanical energy by utilizing fluid kinetic energy

Abstract

The invention discloses a method and a device for generating reciprocating mechanical energy by utilizing fluid kinetic energy, which are characterized in that a vortex street generator generates periodically falling vortexes in a flow field to drive a flexible vibrating body to do reciprocating motion, and the mechanical energy is converted into electric energy. The device has the advantages of being small in occupied space, high in adaptability, high in energy conversion efficiency, free of torque overflow and the like, and is particularly suitable for recycling airflow kinetic energy of a moving carrier (such as a running vehicle).

Description

Technical Field

[0001] The present invention relates to the technical field of fluid power engineering, and particularly to a method and device for generating reciprocating mechanical energy by using fluid kinetic energy, which is especially suitable for converting fluid kinetic energy (such as wind energy, water flow energy or air kinetic energy generated during vehicle driving) into mechanical energy and further converting it into electrical energy or other forms of energy. Background Art

[0002] Currently, the utilization of fluid kinetic energy mainly relies on blade structures (such as wind turbines or water turbines), which drive rotational motion by generating a unidirectional pressure difference on the blades by the fluid, thereby converting fluid kinetic energy into mechanical energy. However, this traditional method has the following disadvantages:

[0003] 1. Large space occupation: The rotating mechanism requires a large radial space and is difficult to be applied in a compact environment.

[0004] 2. High direction sensitivity: It has strict requirements on the fluid direction, and the efficiency decreases significantly in a variable-direction flow field.

[0005] 3. Poor low-flow velocity performance: It is difficult to start or has low efficiency under low-flow velocity conditions.

[0006] 4. Torque will be generated during operation: Torque overflow will be generated during operation, affecting the pile foundation.

[0007] In the prior art, the above problems have not been effectively solved, especially the solutions for efficiently recovering fluid kinetic energy on mobile carriers (such as moving vehicles) are still insufficient. Summary of the Invention

[0008] The purpose of the present invention is to provide a method and device for generating reciprocating mechanical energy by using fluid kinetic energy, and by optimizing the design, solve the problems of large space occupation, low efficiency and torque overflow in the traditional technology.

[0009] Technical Solution:

[0010] The present invention adopts the following technical solutions:

[0011] 1. Force-receiving body: A vibrating body with flexible characteristics is adopted, which can generate reciprocating motion under the action of the fluid.

[0012] 2. Auxiliary device: including but not limited to a vortex street generator (such as a cylinder), which is used to generate periodically shed vortices in the flow field, thereby forming an alternating pressure difference on both sides of the force-receiving body.

[0013] 3. Energy conversion system: Converts the reciprocating mechanical energy of the force-receiving body into electrical energy or other forms of energy.

[0014] Beneficial Effects:

[0015] 1. High space efficiency: Through reciprocating motion, the occupied space of the device is significantly reduced.

[0016] 2. Strong adaptability: It can work efficiently under variable-direction flow fields or low flow velocity conditions.

[0017] 3. High energy conversion efficiency: Through optimized design, the energy conversion efficiency is improved.

[0018] 4. No torque overflow: Through optimizing the fixing method or using a combination of multiple force-bearing bodies, the dynamic balance of the entire device during operation can be achieved. Description of the Drawings

[0019] Figure 1 The following shows a top view schematic diagram of the method device:

[0020] 1. Force-bearing body (vibrating body).

[0021] 2. Coil.

[0022] 3. Auxiliary device (cylinder).

[0023] 4. Magnet.

[0024] 5. Node (fixed point). Detailed Implementation Modes

[0025] The present invention will be described in detail below in conjunction with the implementation cases:

[0026] Example 1: Vehicle-mounted air flow kinetic energy recovery device

[0027] 1. Device composition:

[0028] - Vibrating body: A long strip-shaped flexible structure, flat in the middle, with drag reduction treatment at both ends, and fixed to the vehicle at the node.

[0029] - Vortex street generator: A cylinder with a diameter D = 10 cm, installed in front of the vibrating body, used to generate the Karman vortex street effect.

[0030] - Magnetoelectric conversion module: Comprising a permanent magnet and a copper coil, the permanent magnet is fixed near the node of the vibrating body, and the copper coil is fixed near the vibrating body.

[0031] - Energy storage system: Comprising an electric energy control system and a supercapacitor energy storage unit.

[0032] 2. Working process:

[0033] - When the vehicle is running, the air flows through the cylinder to generate the Karman vortex street effect.

[0034] - The vortex street effect forms an alternating pressure difference on both sides of the vibrating body, driving the vibrating body to make reciprocating motion.

[0035] - The reciprocating motion of the vibrating body drives the permanent magnet to move, cutting the copper coil to generate an induced electromotive force.

[0036] - Electrical energy is transmitted through the wire to the electrical energy control system and finally stored in the energy storage device.

Claims

1. A method for generating reciprocating mechanical energy using fluid kinetic energy, characterized in that Including the following steps: a) Place the force-bearing body in a flowing fluid; b) Form an alternating pressure difference on both sides of the force-bearing body through an auxiliary device; c) The force-bearing body makes a reciprocating motion under the action of the pressure difference; d) Convert the mechanical energy of the reciprocating motion into electrical energy or other forms of energy.

2. The method according to claim 1, wherein: The auxiliary device includes, but is not limited to, a vortex street generator for periodically changing the pressure difference on both sides of the force-bearing body in the flow field.

3. The method according to claim 1, wherein: The nodes of the force-bearing body are fixed and the number is indefinite.

4. The method according to claim 1, wherein: One or more of the force-bearing bodies can be used in combination.

5. The method according to claim 1, wherein: The method of converting the mechanical energy of the reciprocating motion into electrical energy includes, but is not limited to, the layout method of the magnet and the coil in the implementation case.

6. The method according to claim 1, wherein: Convert the mechanical energy of the reciprocating motion into other forms of mechanical energy, including, but not limited to, using the phase difference generated when the non-node part of the force-bearing body moves.

7. An apparatus for generating reciprocating mechanical energy using fluid kinetic energy, characterized in that Including: a) Force-bearing body: used to bear the fluid kinetic energy and generate a reciprocating motion; b) Auxiliary device: used to form an alternating pressure difference on both sides of the force-bearing body; c) Energy conversion system: used to convert the mechanical energy of the reciprocating motion into electrical energy.

8. The method according to claim 7, wherein The shape of the force-bearing body can be designed according to the product requirements as appropriate. It includes, but is not limited to, a long strip-shaped flexible structure with a flat middle and drag reduction treatment at both ends.

9. The method according to claim 7, characterized in that The material properties of the force-bearing body, including, but not limited to, its flexibility, ductility, rigidity, etc., can be selected or combined according to the product requirements as appropriate.

10. The method according to claim 7, wherein The shape, material and other characteristics of the auxiliary device can be set according to the usage situation.

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