Three-degree-of-freedom wave energy capturing and power generating device with parallel hydraulic cylinders driven by three floating bodies

Abstract

The invention provides a three-floating-body-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capturing and power generating device. The three-floating-body-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capturing and power generating device comprises a fixed platform, rotating hinges, parallel hydraulic cylinders, spherical hinges, tripods and semi-ellipsoid floating bodies. A rotating hinge is arranged on the fixed platform, a spherical hinge is arranged on the tripod, one end of the parallel hydraulic cylinder is connected with the rotating hinge, and the other end of the parallel hydraulic cylinder is connected with the spherical hinge; and a plurality of semi-ellipsoid floating bodies are mounted on the tripod. The three semi-ellipsoidal floating bodies are adopted, the area of the floating bodies under the action of wave water power is increased, the three-degree-of-freedom motion energy of the three semi-ellipsoidal floating bodies is captured through parallel driving, and the wave energy capturing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of ocean wave energy power generation, and particularly to a three-float-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device. Background Art

[0002] Wave energy is a kind of ocean renewable clean energy with high energy density and rich reserves, and has broad development prospects. Developing and utilizing wave energy helps to meet the continuous energy growth demand and improve environmental pollution.

[0003] After several generations of technological development of wave energy capture methods, among which oscillating float hydraulic power generation is currently a research hotspot. At present, most oscillating float wave energy capture devices adopt a single-degree-of-freedom motion driving mode of the float, and the multi-degree-of-freedom float wave energy power generation method is relatively rare. Low capture efficiency is a major factor restricting wave energy power generation technology, so it is necessary to provide a wave energy capture and power generation device with improved wave energy capture efficiency. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a three-float-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device.

[0005] According to a three-float-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device provided by the present invention, it includes: a fixed platform, a rotating hinge, a parallel hydraulic cylinder, a ball hinge, a tripod, and a semi-ellipsoidal float;

[0006] A rotating hinge is arranged on the fixed platform, a ball hinge is arranged on the tripod, one end of the parallel hydraulic cylinder is connected to the rotating hinge, and the other end is connected to the ball hinge;

[0007] A plurality of semi-ellipsoidal floats are installed on the tripod.

[0008] Preferably, the parallel hydraulic cylinder includes three groups of single-rod hydraulic cylinders, and each end of each group of single-rod hydraulic cylinders is connected to a rotating hinge and a ball hinge respectively.

[0009] Preferably, the tripod is set as a triangle, and a semi-ellipsoidal float is installed at each vertex of the triangle.

[0010] Preferably, the parallel hydraulic cylinder is installed with a wave energy hydraulic power generation device, and the wave energy hydraulic power generation device is composed of a one-way valve group, a hydraulic power generation circuit, and a make-up oil circuit.

[0011] Preferably, the hydraulic power generation circuit includes: a high-pressure pipeline overflow valve, a high-pressure accumulator, a low-pressure accumulator, a generator, and a hydraulic motor;

[0012] The one-way valve group is connected to the high-pressure pipeline overflow valve, the high-pressure pipeline overflow valve is connected to the high-pressure accumulator, the high-pressure accumulator is connected to the inlet end of the hydraulic motor, the outlet end of the hydraulic motor is connected to the low-pressure accumulator, the low-pressure accumulator is connected to the one-way valve group, and the generator is rigidly connected to the hydraulic motor coaxially.

[0013] Preferably, three sets of one-way valve groups are provided and respectively correspond to a single-rod hydraulic cylinder. The one-way valve group includes: a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve;

[0014] The outlet end of the first one-way valve and the outlet end of the second one-way valve are connected to the high-pressure pipeline overflow valve, and the inlet end of the third one-way valve and the inlet end of the fourth one-way valve are connected to the low-pressure accumulator.

[0015] Preferably, the oil replenishing circuit includes: a fifth one-way valve, a sixth one-way valve, an oil replenishing circuit overflow valve, a hydraulic pump, a motor, and a fuel tank;

[0016] The outlet ends of the fifth one-way valve and the sixth one-way valve are connected to the parallel hydraulic cylinder, the inlet ends of the fifth one-way valve and the sixth one-way valve are connected to the outlet end of the hydraulic pump, and the inlet end of the hydraulic pump is connected to the fuel tank;

[0017] The hydraulic pump is connected to the motor, and both ends of the oil replenishing circuit overflow valve are connected to both ends of the hydraulic pump.

[0018] Preferably, the spherical hinge is located on the side of the tripod facing away from the semi-ellipsoidal floating body, and the spherical hinge is located at the center position of the semi-ellipsoidal floating body.

[0019] Preferably, the outlet ends of the fifth one-way valve and the sixth one-way valve are connected to the inlets of the upper chamber and the lower chamber of a single-rod hydraulic cylinder.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present application uses three ellipsoidal floating bodies, which increases the area of the floating body affected by wave hydrodynamic forces, and parallel drive is used to capture the energy of the three-degree-of-freedom motion of the three semi-ellipsoidal floating bodies, improving the wave energy capture efficiency.

[0022] 2. The number of hydraulic cylinders in the three-degree-of-freedom drive mode of the present application is small, which can reduce the friction loss of the hydraulic cylinders. At the same time, the structure is simplified, the cost is reduced, and it has high load capacity and stability.

[0023] 3. The present application uses parallel hydraulic cylinders to increase the load-bearing capacity, which is suitable for the large thrust of waves. Hydraulic transmission is flexible transmission, which is suitable for the low frequency of waves. Moreover, high and low pressure accumulators are used for energy storage and absorption of pressure fluctuations, making the output stable. Brief Description of the Drawings

[0024] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non - restrictive embodiments read in conjunction with the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of a three - floating - body - driven parallel hydraulic cylinder three - degree - of - freedom wave energy capture and power generation device;

[0026] As shown in the figure:

[0027] Detailed implementation manners

[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can be made. These all belong to the protection scope of the present invention.

[0029] Embodiment 1

[0030] As Figure 1 shown, this embodiment includes: a fixed platform 101, a rotating hinge 102, a parallel hydraulic cylinder 103, a ball hinge 104, a tripod 105, and a semi - ellipsoidal floating body 106; a rotating hinge 102 is provided on the fixed platform 101, a ball hinge 104 is provided on the tripod 105, one end of the parallel hydraulic cylinder 103 is connected to the rotating hinge 102, and the other end is connected to the ball hinge 104; a plurality of semi - ellipsoidal floating bodies 106 are installed on the tripod 105.

[0031] In one implementation manner, the parallel hydraulic cylinder 103 includes three groups of single - rod hydraulic cylinders, and each end of each group of single - rod hydraulic cylinders is connected to a rotating hinge 102 and a ball hinge 104 respectively. The tripod 105 is set as a triangle, and a semi - ellipsoidal floating body 106 is installed at each vertex of the triangle. The ball hinge 104 is located on the side of the tripod 105 facing away from the semi - ellipsoidal floating body 106, and the ball hinge 104 is located at the center position of the semi - ellipsoidal floating body 106. This embodiment uses three semi - ellipsoidal floating bodies 106. Under the same design parameters, the capture efficiency of the ellipsoidal - shaped floating body is greater than that of the cylinder, hemispherical floating body, and cone. The three semi - ellipsoidal floating bodies 106 further increase the area of the floating body affected by the wave hydrodynamic force.

[0032] The parallel hydraulic cylinder 103 is equipped with a wave energy hydraulic power generation device, and the wave energy hydraulic power generation device is composed of a one - way valve group, a hydraulic power generation circuit, and a oil - replenishing circuit.

[0033] The hydraulic power generation circuit includes: a high-pressure pipeline overflow valve 211, a high-pressure accumulator 212, a low-pressure accumulator 213, a generator 214, and a hydraulic motor 215; a check valve group is connected to the high-pressure pipeline overflow valve 211, the high-pressure pipeline overflow valve 211 is connected to the high-pressure accumulator 212, the high-pressure accumulator 212 is connected to the inlet end of the hydraulic motor 215, the outlet end of the hydraulic motor 215 is connected to the low-pressure accumulator 213, the low-pressure accumulator 213 is connected to the check valve group, and the generator 214 is rigidly connected to the hydraulic motor 215 coaxially.

[0034] There are three groups of check valve groups, each corresponding to a single-rod hydraulic cylinder. The check valve group includes: a first check valve 201, a second check valve 202, a third check valve 203, and a fourth check valve 204; the outlet end of the first check valve 201 and the outlet end of the second check valve 202 are connected to the high-pressure pipeline overflow valve 211, and the inlet end of the third check valve 203 and the inlet end of the fourth check valve 204 are connected to the low-pressure accumulator 213.

[0035] The oil replenishing circuit includes: a fifth check valve 205, a sixth check valve 206, an oil replenishing circuit overflow valve 207, a hydraulic pump 208, a motor 209, and a fuel tank 210; the outlet ends of the fifth check valve 205 and the sixth check valve 206 are separately connected to the inlets of the upper chamber and the lower chamber of a single-rod hydraulic cylinder. The inlet ends of the fifth check valve 205 and the sixth check valve 206 are connected to the outlet end of the hydraulic pump 208, the inlet end of the hydraulic pump 208 is connected to the fuel tank 210; the hydraulic pump 208 is connected to the motor 209, and both ends of the oil replenishing circuit overflow valve 207 are connected to both ends of the hydraulic pump 208.

[0036] When the pressure of the low-pressure circuit is insufficient, the motor 209 drives the hydraulic pump 208 to replenish oil to the low-pressure circuit. For example, when the single-rod hydraulic cylinder moves upward and the pressure of the lower chamber connected to the low-pressure circuit is insufficient, the sixth check valve 206 opens, and the lower chamber corresponding to the single-rod hydraulic cylinder is connected to the low-pressure circuit for oil replenishment. When the single-rod hydraulic cylinder moves downward and the pressure of the upper chamber connected to the low-pressure circuit is insufficient, the fifth check valve 205 opens to replenish oil to the upper chamber connected to the low-pressure circuit. The working principles of the other two groups of check valve groups are the same. When the pressure of the oil replenishing circuit exceeds the set pressure, the oil replenishing circuit overflow valve 207 opens, and the excess oil flows back to the fuel tank 210.

[0037] Working principle:

[0038] When the three semi-elliptical floating bodies 106 are subjected to the upward action of waves, the parallel hydraulic cylinders 103 are driven to move upward. The pressure in the upper chamber of the single-rod hydraulic cylinder increases, and the pressure in the lower chamber of the single-rod hydraulic cylinder decreases. The second one-way valve 202 and the third one-way valve 203 open, and the one-way valves corresponding to the other two groups of one-way valve groups also open. The upper chamber of the single-rod hydraulic cylinder outputs high pressure, and the lower chamber returns low-pressure fluid. The high-pressure accumulator 212 stores energy. The energy captured by the three single-rod hydraulic cylinders is gathered into the high-pressure accumulator 212. The pressure difference between the high-pressure accumulator 212 and the low-pressure accumulator 213 drives the hydraulic motor 215, and the hydraulic motor 215 drives the generator 214 to generate electricity. When the parallel hydraulic cylinder 103 moves downward, the first one-way valve 201 and the fourth one-way valve 204 open, and the corresponding one-way valves of the other two groups of one-way valve groups open. After the energy is gathered, it is stored in the high-pressure accumulator 212. The lower chamber of the single-rod hydraulic cylinder outputs high pressure, and the upper chamber of the single-rod hydraulic cylinder returns. The pressure difference between the high-pressure accumulator 212 and the low-pressure accumulator 213 drives the hydraulic motor 215, and the hydraulic motor 215 drives the generator 214 to generate electricity. When the pressure in the high-pressure circuit is higher than the safety pressure, the high-pressure pipeline relief valve 211 unloads.

[0039] Embodiment 2

[0040] Embodiment 2 is a preferred example of Embodiment 1.

[0041] As Figure 1 shown, this embodiment includes: a fixed platform 101, a rotating hinge 102, a parallel hydraulic cylinder 103, a spherical hinge 104, a tripod 105, and three semi-elliptical floating bodies 106. Among them, three groups of rotating hinges 102 are uniformly fixedly installed on the fixed platform 101, and three groups of spherical hinges 104 are uniformly fixedly installed on the tripod 105. One end of the three single-rod hydraulic cylinders of the parallel hydraulic cylinder 103 is respectively connected to the upper rotating hinge 102, and the other end is connected to the lower spherical hinge 104. The three semi-elliptical floating bodies 106 are connected to the tripod 105. The semi-elliptical floating body 106 generates multi-dimensional motion under the excitation of waves, driving the piston of the parallel hydraulic cylinder 103 to reciprocate.

[0042] The wave energy hydraulic energy storage power generation device includes: a one-way valve group, a hydraulic power generation circuit, and a make-up oil circuit.

[0043] The one-way valve group includes: a first one-way valve 201, a second one-way valve 202, a third one-way valve 203, and a fourth one-way valve 204. The outlet end of the first one-way valve 201 and the outlet end of the second one-way valve 202 are connected to the high-pressure pipeline relief valve 211 through a pipeline and are also connected to the high-pressure accumulator 212. The inlet end of the third one-way valve 203 and the inlet end of the fourth one-way valve 204 are connected to the low-pressure accumulator 213 through a pipeline.

[0044] The oil replenishing circuit includes: a fifth one-way valve 205, a sixth one-way valve 206, an oil replenishing circuit overflow valve 207, a hydraulic pump 208, an electric motor 209, and an oil tank 210. Among them, the outlet ends of the fifth one-way valve 205 and the sixth one-way valve 206 are connected to the upper and lower chambers of the single-rod hydraulic cylinder, and the inlet ends are both connected to the outlet end of the hydraulic pump 208.

[0045] The hydraulic power generation circuit includes: a high-pressure accumulator 212, a low-pressure accumulator 213, a hydraulic motor 215, and a generator 214. The inlet end of the hydraulic motor 215 is connected to the high-pressure accumulator 212, the outlet end is connected to the low-pressure accumulator 213, and the generator 214 is rigidly connected to the hydraulic motor 215 coaxially.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0047] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A three-float-driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device, characterized in that: include: A fixed platform (101), a rotating hinge (102), a parallel hydraulic cylinder (103), a ball hinge (104), a tripod (105) and a semi-ellipsoidal float (106); The fixed platform (101) is provided with a rotating hinge (102), the tripod (105) is provided with a ball hinge (104), one end of the parallel hydraulic cylinder (103) is connected to the rotating hinge (102), and the other end is connected to the ball hinge (104); A plurality of semi-ellipsoidal floats (106) are mounted on the tripod (105).

2. According to claim 1, the three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device is characterized by: The parallel hydraulic cylinder (103) includes three groups of single-rod hydraulic cylinders, and each group of single-rod hydraulic cylinders is connected to a rotary hinge (102) and a ball hinge (104) at both ends.

3. According to claim 2, the three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device is characterized by: The tripod (105) is arranged in a triangle shape, and a semi-ellipsoidal float (106) is installed at each vertex of the triangle.

4. According to claim 2, the three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device is characterized by: The parallel hydraulic cylinder (103) is equipped with a wave energy hydraulic power generation device, which is composed of a one-way valve group, a hydraulic power generation circuit and an oil replenishment circuit.

5. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 4 is characterized in that: The hydraulic power generation circuit comprises: a high-pressure pipeline overflow valve (211), a high-pressure accumulator (212), a low-pressure accumulator (213), a generator (214) and a hydraulic motor (215); The one-way valve group is connected to a high-pressure pipeline overflow valve (211), the high-pressure pipeline overflow valve (211) is connected to a high-pressure accumulator (212), the high-pressure accumulator (212) is connected to an inlet end of a hydraulic motor (215), the outlet end of the hydraulic motor (215) is connected to a low-pressure accumulator (213), the low-pressure accumulator (213) is connected to the one-way valve group, and the generator (214) is rigidly connected to the hydraulic motor (215) coaxially.

6. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 5 is characterized in that: The one-way valve group comprises: a first one-way valve (201), a second one-way valve (202), a third one-way valve (203) and a fourth one-way valve (204); The outlet end of the first one-way valve (201) and the outlet end of the second one-way valve (202) are connected to a high-pressure pipeline overflow valve (211), and the inlet end of the third one-way valve (203) and the inlet end of the fourth one-way valve (204) are connected to a low-pressure accumulator (213).

7. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 4 is characterized in that: The oil replenishment circuit comprises: a fifth one-way valve (205), a sixth one-way valve (206), an oil replenishment circuit overflow valve (207), a hydraulic pump (208), an electric motor (209) and an oil tank (210); The outlet ends of the fifth one-way valve (205) and the sixth one-way valve (206) are connected to the parallel hydraulic cylinder (103), the inlet ends of the fifth one-way valve (205) and the sixth one-way valve (206) are connected to the outlet end of the hydraulic pump (208), and the inlet end of the hydraulic pump (208) is connected to the oil tank (210); The hydraulic pump (208) is connected to the electric motor (209), and two ends of the oil replenishment circuit overflow valve (207) are connected to two ends of the hydraulic pump (208).

8. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 3 is characterized by: The ball hinge (104) is located on the side of the tripod (105) facing away from the semi-ellipsoidal floating body (106), and the ball hinge (104) is located at the center of the semi-ellipsoidal floating body (106).

9. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 7, characterized in that: The outlet ends of the fifth one-way valve (205) and the sixth one-way valve (206) are respectively connected to the inlets of the upper chamber and the lower chamber of the corresponding single-rod hydraulic cylinder.

10. The three-floating body driven parallel hydraulic cylinder three-degree-of-freedom wave energy capture and power generation device according to claim 6, characterized in that: The one-way valve groups are provided in three groups and each group corresponds to a single-rod hydraulic cylinder.

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