A self-pressurizing wave energy device energy extraction system

Abstract

The invention discloses an automatic supercharging wave energy device energy extraction system. The system comprises an oil tank, a main hydraulic cylinder, a first one-way valve, a second one-way valve, a hydraulic change-over valve, a first ball valve, a second ball valve, a third one-way valve, a fourth one-way valve, an energy accumulator set and a supercharging hydraulic cylinder. An outlet of the main hydraulic cylinder communicates with a rodless cavity of the supercharging hydraulic cylinder through the second one-way valve and an oil port P and an oil port A of the hydraulic change-over valve. An outlet of the main hydraulic cylinder communicates with an inlet of the fourth one-way valve, a rod cavity of the supercharging hydraulic cylinder and an inlet of the second ball valve through the third one-way valve. The automatic supercharging wave energy device energy extraction system automatically controls hydraulic oil going into the rod cavity and the rodless cavity of the supercharging hydraulic cylinder through the main hydraulic cylinder and the hydraulic change-over valve, can automatically increase the pressure of hydraulic oil going into the energy accumulator set. Accordingly, a small wave energy device can generate electricity from small waves normally and generate electricity from normal waves at high efficiency.

Description

technical field [0001] The invention relates to a hydraulic power generation control technology for a wave energy device, in particular to an energy extraction system for a wave energy device that can be automatically pressurized. Using the automatic pressurization system, the working pressure of the hydraulic system of a small wave energy device can be automatically increased, so that the small wave The energy device can also generate electricity normally when the waves are small, and it can generate electricity with high efficiency under normal waves. Background technique [0002] The energy extraction systems of wave power generation devices generally include pneumatic, hydraulic, and linear motor types, among which hydraulic energy extraction systems are the most common. The principle of the hydraulic energy extraction system is to convert the wave energy absorbed by the float into hydraulic energy and store it in the accumulator. The energy extraction system of the wave...

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Problems solved by technology

[0003] However, for small-scale wave energy generation devices, such as wave energy beacon light power generation systems, the normal installed capacity is only a few hundred watts, or even smaller, and the size of the wave-absorbing float is very small, and the output of the hydraulic cylinder connected to the float is relatively small, resulting in The pressure of the hydraulic oil pumped into the accumulator by the hydraulic cylinder is not high, usually only about 2MPa, even in the case of small waves, because the output of the hydraulic cylinder is too small, the pressure of the hydraulic oil pumped into the accumulator by the hydraulic cylinder cannot reach The start-up pressure of the accumulator causes the wave energy device to fail to generate electricity normally under small waves

[0004] There are only two ways to increase the pressure from the hydraulic cylinder to absorb oil into the accumulator. The first is to reduce the piston area of ​​the hydraulic cylinder, but the piston area of ​​the hydraulic cylinder cannot be made infinitely small. One is that the machining accuracy is relatively high, and the other is On the one hand, the diameter of the hydraulic cylinder is relatively small, and the friction loss of the hydraulic oil in the hydraulic cylinder becomes larger, resulting in a relatively large energy loss and reduced efficiency

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