CN116198669A - Wave energy power generation device - Google Patents

Abstract

The invention discloses a wave energy power generation device, which comprises an underwater floating body, an energy conversion unit installed inside the underwater floating body, and a central floating body fixed on the upper end of the underwater floating body. The outer wall of the central floating body is covered with a main float, and the main float passes through the The pressure cylinder is connected to the energy conversion unit, at least two groups of mooring units are arranged on the periphery of the underwater floating body, and several auxiliary float units are symmetrically distributed on the periphery of the main float, and the auxiliary float units are rigidly connected to the main float. The beneficial effect of the present invention is: by arranging on the peripheral side of the main float a number of sub-float units that are rigidly connected, the sub-float units increase the contact area between the device and the sea surface, enhance the overall water blocking effect of the device, and can Effectively suppress the freedom of the main buoy in the five directions of sway, surge, yaw, roll and pitch, and the device can independently maintain the initial floating state, and maintain the wave energy capture movement of the single degree of freedom of the heave, improving Capture efficiency of wave energy.

Description

Wave energy generator

technical field

The invention relates to the field of marine energy capture equipment, in particular to a wave energy generating device.

Background technique

Equipment that converts wave energy into electrical energy is called a wave energy generator. In recent years, there have been many reports on the research progress of wave power generation devices, but the technology is not yet mature, and there is still a lot of research space and potential.

According to the principle of capturing wave energy, it can be divided into oscillating water column type, oscillating buoy type, pendulum type, over-wave type, etc. The oscillating buoy type wave energy generating device is the device with the most types and the fastest development at present. At present, there are still many single-body wave energy generation devices, and there are few forms for multi-body wave energy devices. The multi-body wave energy generation device shares a base body, which has the characteristics of low cost, high reliability, and good adaptability, and is more suitable for improving the efficiency of wave energy capture and improving the utilization rate of sea area per unit area.

For example, Chinese invention patent application CN113090439A discloses a wave energy generating device based on a multi-float array, which can realize multi-point energy absorption by using a multi-float annular array, improve the stability of wave energy capture, and generally improve the efficiency of the floats. Power generation efficiency; at the same time, each float captures wave energy in the process of moving up and down, which further improves the power generation efficiency of the float.

However, each float in the multi-float array of the above-mentioned device is individually configured with a hinge mechanism, so each float operates independently, and the device as a whole will be subjected to multi-degree-of-freedom energy in waves, so a single float can only move from The energy carried by heaving motion is captured in uncertain multi-degree-of-freedom motion, and the energy conversion rate is low. In addition, the main structure of the above-mentioned device will also perform heaving motion following the waves, so the float and the main body may float up or sink at the same time. In this extreme case, there is no power input to the hinge mechanism, resulting in the overall energy conversion rate of the device per unit time. On the low side.

Contents of the invention

In view of the above problems, the present invention proposes a wave energy generating device, which mainly solves the problem of low energy capture efficiency caused by a single float in the existing multi-floor wave energy generating device generating electricity through an independent hinge mechanism.

In order to solve the problems of the technologies described above, the technical solution of the present invention is as follows:

A wave energy generating device, comprising an underwater floating body, an energy conversion unit installed inside the underwater floating body, and a central floating body fixed on the upper end of the underwater floating body, the outer wall of the central floating body is provided with a main float, The main float is connected to the energy conversion unit through a pressure cylinder, at least two groups of mooring units are arranged on the peripheral side of the underwater floating body, several auxiliary float units are symmetrically distributed on the peripheral side of the main float, and the auxiliary The float unit is rigidly connected to the main float.

In some embodiments, the central axis of the central buoy coincides with the central axis of the main buoy.

In some embodiments, the main float is composed of two semi-cylinders whose centers do not coincide.

In some embodiments, the auxiliary float unit includes a support rod and an auxiliary float, and two ends of the support rod are fixedly connected to the auxiliary float and the main float respectively.

In some embodiments, one end of the strut passes through the center of the sphere of the auxiliary float, and the other end passes through the center of the sphere of the main float.

In some embodiments, the auxiliary float and the main float are located on the same plane.

In some embodiments, the top and bottom of the auxiliary float are respectively provided with vent holes and drain holes.

In some embodiments, two one-way valves are provided inside the auxiliary float, and the two one-way valves respectively control the opening and closing of the exhaust hole and the drain hole.

In some embodiments, the mooring unit includes an anchor chain and an anchor block, one end of the anchor chain is connected to the side wall of the underwater floating body, and the other end of the anchor chain is connected to the anchor block.

In some embodiments, it also includes a coil arranged on the outer wall of the central float, and a magnet arranged inside the main float, the magnet is in the shape of a tube, and the coil is wound along the axial direction of the main float , and the two ends of the coil are coupled to the input end of the energy conversion unit.

The beneficial effect of the present invention is: by arranging several sub-float units rigidly connected around the circumference of the main float, the sub-float units increase the contact area between the device and the sea surface, enhance the overall water blocking effect of the device, and can Effectively suppress the freedom of the main buoy in the five directions of sway, surge, yaw, roll and pitch, and the device can independently maintain the initial floating state, and maintain the wave energy capture movement with a single degree of freedom in the heave, improving Capture efficiency of wave energy.

Description of drawings

Fig. 1 is a structural schematic diagram of a wave energy generating device disclosed in an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an auxiliary float unit disclosed in an embodiment of the present invention;

Fig. 3 is a structural schematic diagram of another wave energy generating device disclosed in an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clear and definite, the content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

This embodiment proposes a wave energy power generation device, as shown in Figure 1, comprising an underwater floating body 1, an energy conversion unit 9 installed inside the underwater floating body 1, and a central floating body 2 fixed on the upper end of the underwater floating body 1. The outer wall of the floating body 2 is provided with a main float 3, the main float 3 is connected to the energy conversion unit 9 through the pressure cylinder 8, at least two groups of mooring units 5 are arranged on the peripheral side of the underwater floating body 1, and the peripheral sides of the main float 3 are symmetrically distributed. Several auxiliary float units 4, the symmetrical distribution of the auxiliary float units 4 can keep the main float 3 in balance and adjust the floating state in time, and the auxiliary float units 4 and the main float 3 are rigidly connected.

In this embodiment, several sub-float units 4 that are rigidly connected are arranged around the circumference of the main float 3, and the sub-float units 4 increase the contact area between the device and the sea surface, and enhance the overall water blocking effect of the device. , can effectively restrain the degrees of freedom of the main buoy 3 in the five directions of sway, surge, yaw, roll and pitch. Movement improves the capture efficiency of wave energy. The mechanical energy captured by the main buoy 3 is input into the energy conversion unit 9 through the pressure cylinder 8, and the mechanical energy is converted into electrical energy and stored.

The above-mentioned energy conversion unit 9 can be any device that can convert mechanical energy into electrical energy, and it can be provided with multiple intermediate-level energy converters, such as hydraulic accumulators, to convert the mechanical energy input by the pressure cylinder 8 into hydraulic energy. When the pressure relief threshold is reached, the hydraulic accumulator automatically releases the high-pressure hydraulic oil, reconverting the hydraulic energy into mechanical energy to drive the turbine, and the turbine finally drives the generator to output electric energy.

The working principle of the present invention is as follows: the wave energy generating device floats on the water surface, half of the main float 3 and the auxiliary float unit 4 are submerged in the bottom of the water, and half of them float on the water surface. Under the action of waves, when the main float 3 moves along the central floating body 2, the hydraulic rod of the pressure cylinder 8 is pulled to move up and down, and the low-pressure hydraulic oil is sucked from the low-pressure oil tank in the energy conversion system 1, and converted into high-pressure hydraulic oil to press into energy In the hydraulic accumulator of the conversion system 1, when the pressure reaches the pressure relief threshold, the hydraulic accumulator automatically releases the high-pressure hydraulic oil.

Under the action of waves, when the main buoy 3 is moving, the auxiliary buoy unit 4 assists it to move only in the vertical direction. Due to the rigid connection between the main floater 3 and the auxiliary floater unit 4, when the floating state of the main floater 3 changes, the balance state of the auxiliary floater unit 4 is also destroyed, and the buoyancy changes, but the gravity does not change. The buoyancy and gravity A restoring moment is formed between them, which prevents the floating state of the main float 3 and the auxiliary float unit 4 from changing. Therefore, except for the motion in the heaving direction, the other degrees of freedom of the main buoy 3 are suppressed, that is, the main buoy 3 can only do single-degree-of-freedom motions that can capture wave energy, that is, heave motion, and the captured wave energy will not be converted into The other degrees of freedom are invalid motions, i.e. the captured wave energy will not be dissipated. On the other hand, the special shape of the central floating body 2 has a water-blocking effect, restricting its movement in waves, not only ensuring the relative movement range between it and the main float 3, but also ensuring the smooth relative movement of the two.

It can be seen from FIG. 2 that the above-mentioned auxiliary float unit 4 adopts a special structural design of eight floating floats. The structure of the device is simple, the floating state is stable, and the degree of freedom of movement is single. Compared with the existing hinged power input, the device has less mechanical wear and is not easy to be damaged, and is suitable for use in complex marine environments.

In one example, continue to refer to FIG. 2 , the auxiliary float unit 4 includes a support rod 401 and an auxiliary float 402 , and both ends of the support rod 401 are fixedly connected to the auxiliary float and the main float respectively. Obviously, the strut 401 mainly plays the role of rigid connection and extension. More specifically, one end of the strut 401 passes through the center of the ball of the auxiliary float 402, and the other end passes through the center of the ball of the main float 3, so that the auxiliary float and the main float Motion is synchronized.

Optionally, the auxiliary float 402 and the main float 3 are located on the same plane, ensuring that the auxiliary float and the main float are at the same draft.

The structure of the auxiliary buoy unit 4 above is simple, and the wave energy captured by the main buoy 3 can only be converted according to the heaving direction, and the conversion efficiency is high and the cost is low.

In addition to the spherical shape, the auxiliary float 402 described above can also be a hollow body of any other shape, as long as it can realize the floating effect.

Optionally, the shape of the pole 401 can be cylindrical or any other shape, and its length can be changed arbitrarily according to actual needs, that is, from nothing to any length.

The central axis of the central floating body 2 coincides with the central axis of the main float 3 to ensure their coaxiality and smooth movement.

The main float 3 is composed of two semi-cylinders whose centers do not coincide. The special streamline shape can make the main float 3 suffer less resistance from the water body during the heaving motion, and effectively use the wave force to increase the movement of the main float 3. The amplitude, the adaptability to the frequency of the wave.

More preferably, the top and bottom of the auxiliary float 402 are respectively provided with a vent hole 403 and a drain hole 404, the vent hole 403 and the drain hole 404 are used to adjust the floating state of the device and facilitate the throwing and recovery of the device.

The inside of the auxiliary float 402 is provided with two one-way valves, and the two one-way valves respectively control the opening and closing of the exhaust hole and the drain hole, and adjust the floating state of the device, that is, the draft. When it is necessary to reduce the draft of the device, high-pressure gas is filled into the auxiliary float 402 from the exhaust hole 402 to discharge the water inside it from the drain hole 404 . When it is necessary to increase the draft of the device, directly open the vent hole 403 and the drain hole 404, the air will automatically enter the vent hole 403, and the water will be discharged from the drain hole 404.

The mooring unit 5 limits the movement range of the central floating body 2 . In one example, the mooring unit 5 includes an anchor chain 501 and an anchor block 502 , one end of the anchor chain 501 is connected to the side wall of the underwater floating body 1 , and the other end of the anchor chain 501 is connected to the anchor block 502 .

In a more optimal embodiment, as shown in Figure 3, it also includes a coil 6 arranged on the outer wall of the center floating body 2, and a magnet 7 arranged on the inside of the main float 3, the magnet 7 is tubular, and the coil 6 is arranged along the main float. 3 is wound in the axial direction, and the two ends of the coil 6 are coupled with the input end of the energy conversion unit 9 . Under the action of waves, when the main buoy 3 performs reciprocating heaving motion relative to the central floating body 2, the coil 7 cuts the magnetic field lines of the magnet 7, thereby generating an induced electromotive force. Through the energy conversion system 1, the generated electric energy is collected for use by loads.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the content of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A wave energy generating device, characterized in that, comprises an underwater floating body, an energy conversion unit installed inside the underwater floating body, and a central floating body fixed on the upper end of the underwater floating body, the outer wall of the central floating body The main float is sleeved, and the main float is connected to the energy conversion unit through a pressure cylinder. At least two groups of mooring units are arranged on the peripheral side of the underwater floating body, and several auxiliary floats are symmetrically distributed on the peripheral side of the main float. unit, and the auxiliary float unit is rigidly connected to the main float. 2. The wave energy generating device according to claim 1, characterized in that, the central axis of the central floating body coincides with the central axis of the main buoy. 3. The wave energy generating device according to claim 1, wherein the main buoy is composed of two semi-cylinders whose centers do not coincide. 4. The wave energy generating device according to claim 1, wherein the auxiliary float unit comprises a strut and an auxiliary float, and the two ends of the strut are respectively fixedly connected with the auxiliary float and the main float . 5 . The wave energy generating device according to claim 4 , wherein one end of the strut passes through the spherical center of the auxiliary float, and the other end passes through the spherical center of the main float. 6. The wave energy generating device according to claim 4, characterized in that, the auxiliary float and the main float are located on the same plane. 7. The wave energy generating device according to claim 4, characterized in that, the top and the bottom of the auxiliary buoy are respectively provided with exhaust holes and drainage holes. 8. The wave energy generating device according to claim 7, characterized in that two check valves are arranged inside the auxiliary float, and the two check valves respectively control the exhaust hole and the drainage hole. The opening and closing of the hole. 9. The wave energy generating device according to claim 1, wherein the mooring unit comprises an anchor chain and an anchor block, wherein one end of the anchor chain is connected to the side wall of the underwater floating body, and the anchor The other end of the chain is connected to the anchor block. 10. The wave energy generating device according to claim 1, further comprising a coil arranged on the outer wall of the central buoy, and a magnet arranged on the inner side of the main buoy, the magnet is in the shape of a tube, so The coil is wound along the axial direction of the main float, and both ends of the coil are coupled to the input end of the energy conversion unit.

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