Hydraulic system integrated with energy storage and power generation

Abstract

The present application relates to the technical field of hydraulic pressure, in particular to a kind of whole integrated hydraulic system of energy storage power generation, cooperate with wave energy capture structure, including pressure cylinder, hydraulic rod and multiple check valves, hydraulic rod is connected with wave energy capture structure, pressure cylinder is divided into at least four cavities, cavity is connected by check valve between;At least four cavities are provided with hydraulic rod, air bag, hydraulic medium and control and power generation device;Hydraulic rod does reciprocating linear motion in pressure cylinder, changes the pressure in at least four cavities by reciprocating linear motion, and hydraulic medium flows through at least four cavities by check valve, and each component is integrated as a whole by multiple cavities, and energy storage, energy storage and power generation are integrated, a large amount of space is saved, a large amount of hydraulic pipeline is reduced, and energy loss is also reduced;At the same time, since each cavity corresponds to each work link, each work link is connected by check valve, and the problems of hydraulic pipeline leakage and aging are avoided.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, and specifically to an integrated hydraulic system for energy storage and power generation. Background Technology

[0002] A hydraulic system uses a hydraulic medium to increase and transmit power by compressing and releasing the medium. Hydraulic systems can be divided into two categories: hydraulic transmission systems and hydraulic control systems.

[0003] Hydraulic transmission systems primarily function to transmit power and motion. Hydraulic control systems, on the other hand, ensure that the output of the hydraulic system meets specific performance requirements (especially dynamic performance). Generally, the term "hydraulic system" primarily refers to the hydraulic transmission system.

[0004] A complete hydraulic system generally consists of five parts: power element, actuator, control element, auxiliary element (accessory) and hydraulic medium.

[0005] In existing hydraulic devices for wave energy generation (i.e., hydraulic wave energy capture structures), the reciprocating motion of hydraulic cylinders is used to convert wave energy into mechanical energy, which can achieve a large installed power and stable output.

[0006] The hydraulic transmission system in a hydraulic wave energy harvesting structure consists of components such as hydraulic cylinders, accumulators, hydraulic motors, and generators. These components are connected by hydraulic pipelines and valve groups, resulting in complex and lengthy piping. This leads to significant hydraulic energy loss, reduced system reliability, and increased required space. This is difficult to implement for floating wave energy harvesting structures without a foundation platform at sea, increasing construction and maintenance costs, raising the risk of damage from wind and waves, and hindering the development of smaller and simpler systems. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art, namely, the complexity, large structure, high energy loss along the process, low reliability, and large layout space of the hydraulic system in the prior art. This invention provides an integrated hydraulic system for energy storage and power generation, which realizes the miniaturization of wave energy and the efficient conversion of energy.

[0008] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0009] An integrated hydraulic system for energy storage and power generation is used in conjunction with a wave energy capture structure. The integrated hydraulic system for energy storage and power generation includes a pressure-resistant cylinder, a hydraulic rod, and multiple check valves. The hydraulic rod is connected to the wave energy capture structure. Wave energy generation drives the hydraulic rod to perform reciprocating linear motion within the pressure-resistant cylinder. The pressure-resistant cylinder is divided into at least four chambers, which are connected to each other through the check valves.

[0010] The at least four cavities include a first cavity, a second cavity, a third cavity, and a fourth cavity. The first cavity contains the hydraulic rod, the second cavity contains the airbag, the third cavity contains the hydraulic medium, and the fourth cavity contains the control and power generation device.

[0011] The hydraulic rod reciprocates linearly within the pressure-resistant cylinder, causing pressure changes in at least four of the cavities through this reciprocating linear motion. The hydraulic medium flows through at least four of the cavities via the one-way valve.

[0012] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the first cavity, the second cavity, the third cavity and the fourth cavity are all coaxially arranged with the pressure-resistant cylinder, and the first cavity is located on the axis of the pressure-resistant cylinder;

[0013] The first cavity is a hollow cylindrical shape, and the second and third cavities are semi-circular annular cylinders, symmetrically arranged between the first cavity and the inner wall of the pressure-resistant cylinder.

[0014] The fourth cavity is disposed below the first cavity, the second cavity, and the third cavity.

[0015] The third cavity has a knife-shaped cross-section and includes a connected upper semicircular portion and a lower semicircular portion. The depth of the upper semicircular portion is the same as the depth of the first cavity and the second cavity, and the depth of the lower semicircular portion is the same as the depth of the fourth cavity.

[0016] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, a sealing component is provided at the bottom of the hydraulic rod, and the sealing component and the bottom surface of the first cavity form a fifth cavity, which is connected to the second cavity and the third cavity respectively.

[0017] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the diameter of the sealing component is the same as the inner diameter of the first cavity, and the sealing component can reciprocate within the pressure-resistant cylinder along with the hydraulic rod.

[0018] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the plurality of check valves include a first check valve, a second check valve, a third check valve and a fourth check valve.

[0019] The first check valve connects the fifth chamber and the third chamber, and the hydraulic medium flows from the third chamber to the fifth chamber;

[0020] The second check valve connects the second chamber and the fifth chamber, and the hydraulic medium flows from the fifth chamber to the second chamber;

[0021] The third check valve connects the second cavity and the control and power generation device, and the hydraulic medium flows from the second cavity to the control and power generation device;

[0022] The fourth check valve connects the control and power generation device and the third chamber, and the hydraulic medium flows from the control and power generation device to the third chamber.

[0023] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the control and power generation device includes a controller, a hydraulic motor, a generator and a coupling, wherein the generator is connected to the hydraulic motor through the coupling;

[0024] The hydraulic motor is disposed in the fourth chamber, and the oil inlet of the hydraulic motor is connected to the second chamber, and the oil outlet of the hydraulic motor is connected to the third chamber through the fourth check valve;

[0025] The controller is located between the third check valve and the hydraulic motor inlet. The controller is used to detect the pressure in the second chamber and control the opening and closing of the third check valve.

[0026] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, an exhaust channel is provided between the pressure-resistant cylinder and the second cavity, and the exhaust channel is connected to the fifth cavity.

[0027] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the third cavity is also provided with an interface for connecting to the outside world, and the interface is used to input or discharge the hydraulic medium.

[0028] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the airbag includes an initial state and a usage state. When the airbag is in the initial state, the airbag is pre-filled with a first amount of gas. When the airbag is in the usage state, the airbag is filled with a second amount of gas, which allows the airbag to fill the inner cavity of the second cavity. The first amount of gas is less than the second amount of gas.

[0029] As an improvement to the technical solution of the integrated hydraulic system for energy storage and power generation of the present invention, the pressure-resistant cylinder is a pressure-resistant cylinder that can store energy, store oil and / or generate electricity.

[0030] The beneficial effects of this invention are:

[0031] In this invention, the various components are integrated into a single unit through multiple cavities, combining energy storage, energy conservation, and power generation into one, saving significant space. The cavities are connected via check valves, reducing the amount of hydraulic piping required and minimizing energy loss during transmission. Furthermore, since each cavity corresponds to a specific working stage, and check valves connect these stages, issues such as hydraulic pipeline leakage and aging are avoided. Moreover, the hydraulic medium flows back directly through check valves installed at the bottom of the cavities, preventing the formation of hydraulic oil foam and thus avoiding any threat to equipment safety. Attached Figure Description

[0032] Fig. 1 This is a front view of the wave energy capture structure of the present invention.

[0033] Fig. 2 This is a top view of the wave energy capture structure of the present invention.

[0034] Fig. 3 This is a left-side cross-sectional view of the wave energy capture structure of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1-Hydraulic rod; 2-Pressure cylinder; 3-First chamber; 4-Second chamber; 5-Third chamber; 6-Fourth chamber; 7-Sealing component; 8-Exhaust port; 9-Hydraulic medium; 10-Airbag; 11-1-First check valve; 11-2-Second check valve; 11-3-Third check valve; 11-4-Fourth check valve; 12-1-Inlet; 12-2-Outlet; 13-Controller; 14-Hydraulic motor; 15-Generator; 16-Interface; 17-Fifth chamber. Detailed Implementation

[0036] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0037] like Figs. 1 to 3 As shown, the integrated hydraulic system for energy storage and power generation is used in conjunction with the wave energy capture structure. The integrated hydraulic system for energy storage and power generation includes a pressure-resistant cylinder 2, a hydraulic rod 1, and multiple check valves. The hydraulic rod 1 is connected to the wave energy capture structure, and the wave energy capture structure drives the hydraulic rod 1 to perform reciprocating linear motion within the pressure-resistant cylinder 2. The characteristic feature is that the pressure-resistant cylinder 2 is divided into at least four cavities, and the cavities are connected to each other through check valves.

[0038] At least four cavities include a first cavity 3, a second cavity 4, a third cavity 5 and a fourth cavity 6. A hydraulic rod 1 is installed in the first cavity 3, an airbag 10 is installed in the second cavity 4, a hydraulic medium 9 is installed in the third cavity 5, and a control and power generation device is installed in the fourth cavity 6.

[0039] The hydraulic rod 1 reciprocates linearly within the pressure-resistant cylinder 2, causing pressure changes in at least four chambers through this reciprocating linear motion. The hydraulic medium 9 flows through at least four chambers via a one-way valve.

[0040] When in use, the hydraulic rod 1 reciprocates within the first cavity 3 to change the pressure between the cavities. This pressure change allows the hydraulic medium 9 to flow. Furthermore, in this invention, the cavities are interconnected, and a one-way valve controls the flow of the hydraulic medium 9 between different cavities, eliminating the need for connecting pipelines, reducing the required layout space, and making it suitable for floating wave energy capture structures without foundation platforms at sea.

[0041] In this invention, the pressure-resistant cylinder 2 is a pressure-resistant cylinder that can store energy, store oil, and / or generate electricity.

[0042] In detail, in this invention, since the pressure-resistant cylinder 2 is connected to the wave energy capture structure, when the wave energy capture structure collects wave energy along with the waves, the obtained wave energy is converted into hydraulic energy and stored in the pressure-resistant cylinder 2, that is, the pressure-resistant cylinder 2 achieves the effect of energy storage; moreover, since the pressure-resistant cylinder 2 stores hydraulic medium 9, that is, the pressure-resistant cylinder 2 achieves the effect of oil storage, where the oil referred to here refers to hydraulic medium 9; and since the pressure-resistant cylinder 2 is also equipped with a control and power generation device, that is, the pressure-resistant cylinder 2 can achieve the effect of power generation.

[0043] Furthermore, the first cavity 3, the second cavity 4, the third cavity 5 and the fourth cavity 6 are all coaxially arranged with the pressure-resistant cylinder 2, and the first cavity 3 is located on the axis of the pressure-resistant cylinder 2;

[0044] The first cavity 3 is a hollow cylindrical shape, and the second cavity 4 and the third cavity 5 are semi-circular annular cylinders, which are symmetrically arranged between the inner walls of the first cavity 3 and the pressure-resistant cylinder 2.

[0045] The fourth cavity 6 is located below the first cavity 3, the second cavity 4, and the third cavity.

[0046] The third cavity 5 has a knife-shaped cross-section and includes an upper semicircular ring and a lower semicircular ring that are connected. The depth of the upper semicircular ring is the same as the depth of the first cavity 3 and the second cavity 4, and the depth of the lower semicircular ring is the same as the depth of the fourth cavity 6.

[0047] In detail, each cavity can have a different shape, as long as it can achieve the effect of connecting the cavities through a one-way valve. In this invention, the preferred shape and arrangement of each cavity are as described above. More preferably, the pressure-resistant cylinder 2 is a cylindrical hollow cylinder with a smooth inner wall, and its thickness can be set according to the pressure it bears.

[0048] The hydraulic rod 1 is a cylindrical hollow rod, which is coaxial with the pressure-resistant cylinder 2. Its length is greater than the depth of the first cavity 3. One end of the hydraulic rod 1 outside the pressure-resistant cylinder 2 is connected to the wave-absorbing float of the wave energy capture structure. Under the action of the wave-absorbing float in the wave energy capture structure, the hydraulic rod 1 achieves the effect of reciprocating motion inside the pressure-resistant cylinder 2.

[0049] Furthermore, a sealing component 7 is provided at the bottom of the hydraulic rod 1. The sealing component 7 and the bottom surface of the first cavity 3 form a fifth cavity 17, which is connected to the second cavity 4 and the third cavity 5 respectively. A sealing component 7 is provided at one end of the hydraulic rod 1 inside the pressure-resistant cylinder 2. The sealing component 7 can be a sealing ring or a sealing gasket, and its diameter is the same as the inner diameter of the first cavity 3. The sealing component 7 can reciprocate within the first cavity 3 along with the hydraulic rod 1. The sealing component 7 can seal the hydraulic medium 9 within the fifth cavity 17, preventing the hydraulic medium 9 from leaving the pressure-resistant cylinder 2.

[0050] In some embodiments of the present invention, the plurality of check valves include a first check valve 11-1, a second check valve 11-2, a third check valve 11-3, and a fourth check valve 11-4; the first check valve 11-1 connects the fifth chamber 17 and the third chamber 5, and the hydraulic medium 9 flows from the third chamber 5 to the fifth chamber 17; the second check valve 11-2 connects the second chamber 4 and the fifth chamber 17, and the hydraulic medium 9 flows from the fifth chamber 17 to the second chamber 4; the third check valve 11-3 connects the second chamber 4 and the control and power generation device, and the hydraulic medium 9 flows from the second chamber 4 to the control and power generation device; the fourth check valve 11-4 connects the control and power generation device and the third chamber 5, and the hydraulic medium 9 flows from the control and power generation device to the third chamber 5.

[0051] In some embodiments of the present invention, the control and power generation device includes a controller 13, a hydraulic motor 14, a generator 15 and a coupling, wherein the generator 15 is connected to the hydraulic motor 14 via the coupling.

[0052] The hydraulic motor 14 is installed in the fourth chamber 6, and the oil inlet 12-1 of the hydraulic motor 14 is connected to the second chamber 4, and the oil outlet 12-2 of the hydraulic motor 14 is connected to the third chamber 5 through the fourth check valve 11-4.

[0053] The controller 13 is located between the third check valve 11-3 and the oil inlet 12-1 of the hydraulic motor 14. The controller 13 is used to detect the pressure in the second chamber 4 and control the opening and closing of the third check valve 11-3.

[0054] In some embodiments of the present invention, the airbag 10 includes an initial state and a usage state. When the airbag 10 is in the initial state, it is pre-filled with a first amount of gas. When the airbag 10 is in the usage state, it is filled with a second amount of gas, which is sufficient to fill the inner cavity of the second cavity 4. The first amount of gas is less than the second amount of gas. The inflation method of the airbag 10 is as described in the prior art. As an example of the prior art, the airbag 10 can be externally connected to an inflation device, which is connected to the airbag 10 via an inflation tube to inflate the airbag 10.

[0055] In some embodiments of the present invention, an exhaust channel is provided between the pressure-resistant cylinder 2 and the second cavity 4, and the exhaust channel is connected to the fifth cavity 17. Specifically, the exhaust channel is located between the second cavity 4 and the pressure-resistant cylinder 2, and is connected to the fifth cavity 17. The exhaust channel is connected to the outside environment. During use, when the hydraulic rod 1 reciprocates within the pressure-resistant cylinder 2, it can exhaust or replenish gas to the fifth cavity 17 through the exhaust port. As one embodiment of the present invention, the exhaust channel is connected to the fifth cavity 17, and the exhaust channel is located on one side of the first cavity 3, with the exhaust port of the exhaust channel located in the upper part of the second cavity 4.

[0056] In some embodiments of the present invention, the third cavity 5 is further provided with an interface 16 that communicates with the outside world, the interface 16 being used for inputting or discharging hydraulic medium 9.

[0057] When in use, the wave-capturing structure of the present invention reciprocates under the action of waves, which in turn drives the hydraulic rod 1 to reciprocate along the first cavity 3.

[0058] When the hydraulic rod 1 moves out of the first cavity 3, that is, when the hydraulic rod 1 extends outward, the volume of the fifth cavity 17 gradually increases, and the pressure inside the fifth cavity 17 decreases. The pressure balance inside the fifth cavity 17 is broken, and the hydraulic medium 9 is forced into the fifth cavity 17 through the first check valve 11-1.

[0059] When the hydraulic rod 1 retracts into the first chamber 3, that is, when the hydraulic rod 1 retracts inward, the volume of the fifth chamber 17 gradually decreases and the pressure in the fifth chamber 17 increases. The pressure balance in the fifth chamber 17 is broken, and the hydraulic medium 9 is forced into the second chamber 4 through the second check valve 11-2.

[0060] Repeat the above movements, and the low-pressure hydraulic medium 9 in the third chamber 5 is forced into the second chamber 4.

[0061] As the hydraulic medium 9 in the second chamber 4 slowly increases, the air bladder 10 in the second chamber 4 is compressed, the pressure in the second chamber 4 gradually increases, and the pressure of the hydraulic medium 9 in the second chamber 4 also increases accordingly.

[0062] At this time, when the controller 13 detects that the pressure in the second chamber 4 has reached the preset pressure value, it opens the third check valve 11-3, and the high-pressure hydraulic medium 9 in the third chamber 5 is released instantly.

[0063] High-pressure hydraulic medium 9 enters the hydraulic motor 14 through the oil inlet 12-1, thereby driving the generator 15 to rotate and generate electricity.

[0064] The energy of the high-pressure hydraulic medium 9, after passing through the hydraulic motor 14, becomes low-pressure hydraulic medium 9, which flows into the third chamber 5 through the fourth check valve 11-4. At this time, the hydraulic medium 9 in the third chamber 5 is gradually released, the pressure in the third chamber 5 gradually decreases, and the airbag 10 gradually increases in volume under the action of the internal gas pressure, gradually returning to its original shape.

[0065] When the pressure in the third chamber 5 gradually increases and exceeds the preset value, some of the hydraulic medium 9 flows directly into the third chamber 5 without passing through the third check valve 11-3.

[0066] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. An integrated hydraulic system for energy storage and power generation, used in conjunction with a wave energy capture structure, wherein the integrated hydraulic system for energy storage and power generation includes a pressure-resistant cylinder, a hydraulic rod, and multiple one-way valves; the hydraulic rod is connected to the wave energy capture structure; and the wave energy generation drives the hydraulic rod to perform reciprocating linear motion within the pressure-resistant cylinder, characterized in that... The pressure-resistant cylinder is divided into at least four chambers, which are connected to each other by the one-way valve; The at least four cavities include a first cavity, a second cavity, a third cavity, and a fourth cavity. The first cavity contains the hydraulic rod, the second cavity contains an airbag, the third cavity contains a hydraulic medium, and the fourth cavity contains a control and power generation device. The hydraulic rod reciprocates linearly within the pressure-resistant cylinder, causing pressure changes in at least four of the cavities through this reciprocating linear motion. The hydraulic medium flows through at least four of the cavities via the one-way valve. The first cavity, the second cavity, the third cavity, and the fourth cavity are all coaxially arranged with the pressure-resistant cylinder, and the first cavity is located on the axis of the pressure-resistant cylinder; The first cavity is a hollow cylindrical shape, and the second and third cavities are semi-circular annular cylinders, symmetrically arranged between the inner wall of the first cavity and the pressure-resistant cylinder. The fourth cavity is disposed below the first cavity, the second cavity, and the third cavity. The third cavity has a knife-shaped cross-section and includes a connected upper semicircular ring and a lower semicircular ring. The depth of the upper semicircular ring is the same as the depth of the first cavity and the second cavity, and the depth of the lower semicircular ring is the same as the depth of the fourth cavity. The bottom of the hydraulic rod is provided with a sealing component, and the sealing component and the bottom surface of the first cavity form a fifth cavity. The fifth cavity is connected to the second cavity and the third cavity respectively. The plurality of check valves includes a first check valve, a second check valve, a third check valve, and a fourth check valve; The first check valve connects the fifth chamber and the third chamber, and the hydraulic medium flows from the third chamber to the fifth chamber; The second check valve connects the second chamber and the fifth chamber, and the hydraulic medium flows from the fifth chamber to the second chamber; The third check valve connects the second cavity and the control and power generation device, and the hydraulic medium flows from the second cavity to the control and power generation device; The fourth check valve connects the control and power generation device and the third chamber, and the hydraulic medium flows from the control and power generation device to the third chamber; The control and power generation device includes a controller, a hydraulic motor, a generator, and a coupling, wherein the generator is connected to the hydraulic motor via the coupling; The hydraulic motor is disposed in the fourth chamber, and the oil inlet of the hydraulic motor is connected to the second chamber, and the oil outlet of the hydraulic motor is connected to the third chamber through the fourth check valve; The controller is located between the third check valve and the hydraulic motor inlet. The controller is used to detect the pressure in the second chamber and control the opening and closing of the third check valve.

2. The integrated hydraulic system for energy storage and power generation according to claim 1, characterized in that, The diameter of the sealing component is the same as the inner diameter of the first cavity, and the sealing component reciprocates within the pressure-resistant cylinder along with the hydraulic rod.

3. The integrated hydraulic system for energy storage and power generation according to claim 1, characterized in that, An exhaust channel is provided between the pressure-resistant cylinder and the second cavity, and the exhaust channel is connected to the fifth cavity.

4. The integrated hydraulic system for energy storage and power generation according to claim 1, characterized in that, The third cavity is also provided with an interface for connecting to the outside world, which is used to input or discharge the hydraulic medium.

5. The integrated hydraulic system for energy storage and power generation according to claim 1, characterized in that, The airbag includes an initial state and a usage state. When the airbag is in the initial state, it is pre-filled with a first amount of gas. When the airbag is in the usage state, it is filled with a second amount of gas, which allows the airbag to fill the inner cavity of the second cavity. The first amount of gas is less than the second amount of gas.

6. The integrated hydraulic system for energy storage and power generation according to claim 1, characterized in that, The pressure-resistant cylinder is a pressure-resistant cylinder that can store energy, oil, and / or generate electricity.

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