A debuggable wave energy hydraulic energy conversion system and control method

Abstract

The present invention discloses an adjustable hydraulic energy conversion system for a wave energy power generation device, and relates to control technology for the hydraulic energy conversion system of a wave energy power generation device. The system includes an oil tank, a hydraulic pump, an electric motor, a frequency converter, a relief valve, an adjusting spring, a three-position four-way electromagnetic reversing valve, a hydraulically controlled one-way valve, a ball valve, a one-way valve, a working hydraulic cylinder, a two-way cartridge valve, a two-position three-way electromagnetic reversing valve, and an electric accumulator group. This debugging system, based on the hydraulic energy conversion system of the wave energy device, adds some electrical and hydraulic equipment. It uses an electric motor and a pump as the power source, and an electromagnetic reversing valve controls the direction of the oil circuit to drive the hydraulic cylinder of the wave energy device's power element to reciprocate up and down. This enables large-scale wave energy power generation devices to be debugged using their own energy conversion system, greatly reducing the economic and time costs of debugging, and reducing the construction difficulty during offshore debugging.

Description

Technical Field

[0001] The present invention relates to a control technology for a hydraulic energy conversion system of a wave energy power generation device, and in particular to an adjustable wave energy hydraulic energy conversion system and a control method. Background Art

[0002] With rapid socioeconomic development and rising demands for improved quality of life and the natural environment, clean, pollution-free renewable energy has become a necessity for energy consumption in every country. Ocean wave energy is a clean, pollution-free, renewable marine energy source. With the rapid development of various wave energy technologies, numerous prototype wave energy devices have undergone real-sea testing, and a small number have been connected to the grid and are now operating commercially. Therefore, in the future, an increasing number of large-scale wave energy devices will be operating in real-sea conditions, providing clean energy for coastal areas and isolated islands and reefs.

[0003] There are many types of wave energy devices. Based on the wave energy conversion principle, wave energy devices can be divided into pneumatic, hydraulic, hydraulic, and special motor types. Hydraulic wave energy devices utilize hydraulic systems to convert and transmit energy. Because hydraulic systems are widely used in various industries and their components are standard industrial products, the reliability of hydraulic energy conversion systems can be guaranteed. In addition, short-term energy storage devices can be added to the hydraulic system to stabilize the unstable energy caused by the randomness of the waves, making the final power generation more stable and improving the quality of power generation. Therefore, the majority of wave energy devices currently use hydraulic energy conversion systems.

[0004] For large hydraulic wave energy generators, the hydraulic energy conversion system must be debugged after it is built in the factory. However, since wave energy generators operating in real sea conditions typically have high installed power and are very heavy, the wave absorbing floats of the wave energy generators are also relatively heavy. Typically, a single wave absorbing float in a 100-kilowatt wave energy generator weighs 60 tons or even more. To debug the power generation function of a wave energy generator, a crane weighing hundreds of tons is required to simulate wave motion. This is extremely costly, and the startup and hoisting of large cranes is very time-consuming, significantly increasing the debugging time. At sea, wave energy generators also require system debugging after regular maintenance. During this time, large cranes cannot be used, and on-site debugging requires high-powered marine winches. This increases the difficulty of marine engineering construction and requires a long construction window, which in turn leads to higher debugging costs. Therefore, how to enable the wave energy power generation device to use its own equipment as a power source and perform corresponding control so that the pre-operation debugging of the wave energy power generation device does not require the use of super-large equipment, thereby reducing the operation and testing costs of the wave energy power generation device, is an issue that needs to be considered when designing the wave energy power generation device. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention provides an adjustable wave energy hydraulic energy conversion system and control method, which utilizes the wave energy conversion system of the wave energy power generation device itself to simulate the wave-driven float, thereby realizing pre-factory debugging and power generation capacity testing of the wave energy power generation device.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An adjustable wave energy hydraulic energy conversion system includes: an oil tank, a hydraulic pump, a relief valve, a three-position four-way electromagnetic reversing valve, a working hydraulic cylinder, a two-way cartridge valve, a hydraulically controlled one-way valve, a two-position three-way electromagnetic reversing valve and an accumulator group, wherein:

[0008] The gas port Q of the oil tank is connected to the rodless chamber of the working hydraulic cylinder;

[0009] The oil suction port R of the oil tank is connected to two branches, wherein one branch is connected to the rod chamber of the working hydraulic cylinder, and the other branch is connected to the inlet of the hydraulic pump;

[0010] The oil return port S of the oil tank is connected to four branches, wherein one branch is connected to the outlet J of the overflow valve, one branch is connected to the B port of the three-position four-way solenoid reversing valve, one branch is connected to the F port of the two-position three-way solenoid reversing valve, and one branch is connected to the I port of the two-way cartridge valve;

[0011] The oil inlet K of the overflow valve is connected to two branches, one of which is connected to the outlet of the hydraulic pump, and the other is connected to the C port of the three-position four-way electromagnetic reversing valve;

[0012] The D port of the three-position four-way electromagnetic reversing valve is connected to the M port of the hydraulically controlled one-way valve, and the A port of the three-position four-way electromagnetic reversing valve is connected to the L port of the hydraulically controlled one-way valve.

[0013] The N port of the hydraulically controlled one-way valve is connected to two branches, one of which is connected to the rodless chamber of the working hydraulic cylinder, and the other is connected to the H port of the two-way cartridge valve;

[0014] The G port of the two-position three-way electromagnetic reversing valve is connected to the oil port O of the two-way cartridge valve;

[0015] The rod chamber of the working hydraulic cylinder is also connected to the accumulator group;

[0016] The H port of the two-way cartridge valve is connected to two branches, wherein one branch is connected to the pipeline between the hydraulically controlled one-way valve and the working hydraulic cylinder, and the other branch is communicated with the E port of the two-way cartridge valve.

[0017] The adjustable wave energy hydraulic energy conversion system as described above further includes an electric motor and a frequency converter, wherein the hydraulic pump is coaxially connected to the electric motor, and the electric motor is driven by the frequency converter.

[0018] The adjustable wave energy hydraulic energy conversion system as described above further includes a first ball valve and a second ball valve, wherein the first ball valve is arranged downstream of the main oil circuit oil port N outlet of the hydraulically controlled one-way valve; and the second ball valve is provided on the pipeline connecting the gas port Q of the oil tank and the rodless chamber of the working hydraulic cylinder.

[0019] The adjustable wave energy hydraulic energy conversion system as described above further includes a first one-way valve, a second one-way valve and a third one-way valve, wherein the first one-way valve is arranged on a pipeline connecting the oil suction port R of the oil tank and the rod chamber of the working hydraulic cylinder, the second one-way valve is arranged on a pipeline connecting the rod chamber of the working hydraulic cylinder and the accumulator group, and the third one-way valve is arranged on a pipeline connecting the oil return port of the oil tank and the F port of the two-position three-way electromagnetic reversing valve.

[0020] An adjustable wave energy hydraulic energy conversion control method, based on any of the adjustable wave energy hydraulic energy conversion systems described above, comprising:

[0021] The system is used in a first control mode and a second control mode in the working mode, wherein the first control mode is used to simulate the working condition when the wave-absorbing floating body moves upward; the second control mode is used to simulate the working condition when the wave-absorbing floating body moves downward;

[0022] The third and fourth control modes used for the system in the debugging mode, wherein the third control mode is used to simulate the working condition of the wave-driven wave-absorbing float moving upward, and the fourth control mode is used to simulate the working condition when the pipeline and the hydraulic valve block are blocked or misoperated in the third control mode;

[0023] The fifth control mode, the sixth control mode and the seventh control mode are used for the system in the debugging mode, and the fifth control mode, the sixth control mode and the seventh control mode are used to simulate the working condition that the wave drives the wave-absorbing float to move downward at a gradually increasing speed.

[0024] The adjustable wave energy hydraulic energy conversion control method as described above, further,

[0025] The first control mode and the second control mode both include the following process:

[0026] The inverter, motor and hydraulic pump are in the off state;

[0027] The relief valve is in the first pressure state, and its K port and J port are in the disconnected state;

[0028] The valve core of the three-position four-way solenoid directional valve is in the middle position, port C is disconnected, and ports D, A and B are connected;

[0029] The H port and I port of the two-way cartridge valve are blocked;

[0030] The valve core of the two-position three-way electromagnetic reversing valve is in the right position, the E port and the G port are connected, and the F port is disconnected;

[0031] In the first control mode, the second ball valve is in the open state; the first ball valve is in the closed state; the working hydraulic cylinder, driven by the wave absorbing float of the wave energy device, performs up and down reciprocating motion. When driven upward by the wave force, the piston of the working hydraulic cylinder moves upward synchronously, and the hydraulic oil in the rod chamber of the working hydraulic cylinder enters the accumulator group for energy storage and pressure stabilization; the rodless chamber of the working hydraulic cylinder draws gas from the upper part of the oil tank;

[0032] In the second control mode, the second ball valve is in the open state; the first ball valve is in the closed state; the working hydraulic cylinder is driven by the wave-absorbing float of the wave energy device to perform reciprocating motion up and down. When the float moves downward under the force of gravity, the piston of the working hydraulic cylinder moves downward synchronously. The rod chamber of the working hydraulic cylinder draws hydraulic oil from the oil suction port R of the oil tank, and the rodless chamber of the working hydraulic cylinder discharges the gas into the gas port Q of the oil tank.

[0033] The adjustable wave energy hydraulic energy conversion control method as described above, further,

[0034] The third control mode and the fourth control mode both include the following processes:

[0035] The first ball valve is in the open state;

[0036] The second ball valve is in the closed state;

[0037] The inverter is powered on and started, driving the motor and hydraulic pump to rotate. The hydraulic pump draws oil from the oil tank and pumps it into the relief valve and the three-position four-way solenoid reversing valve;

[0038] The valve core of the three-position four-way solenoid directional valve is in the left position. At this time, port C is connected to port D, and port A is connected to port B.

[0039] One branch of the hydraulic oil pumped out by the hydraulic pump enters the rodless chamber of the working hydraulic cylinder through the three-position four-way electromagnetic reversing valve and the hydraulically controlled one-way valve, and the other branch enters the two-way cartridge valve through the three-position four-way electromagnetic reversing valve and the hydraulically controlled one-way valve;

[0040] The H port and I port of the two-way cartridge valve are not connected;

[0041] The valve core of the two-position three-way solenoid directional valve is in the right position, and the E port and the G port are connected;

[0042] The hydraulic oil in the rodless chamber of the working hydraulic cylinder gradually increases, the piston continuously moves upward, and the wave-absorbing float connected to the working hydraulic cylinder is gradually lifted up; in the process of the piston moving upward, the hydraulic oil in the rod chamber of the working hydraulic cylinder is simultaneously discharged and enters the accumulator group to perform the energy storage and pressure stabilization process; wherein,

[0043] In the third control mode, the K port and the J port of the relief valve are disconnected and in an open circuit state; in the fourth control mode, the K port and the J port of the relief valve are connected to perform overflow.

[0044] The adjustable wave energy hydraulic energy conversion control method as described above, further,

[0045] The fifth control mode, the sixth control mode, and the seventh control mode all include the following processes:

[0046] The rod chamber of the working hydraulic cylinder synchronously draws oil from the oil tank to prepare for the next set of up and down reciprocating cycle motion;

[0047] The hydraulic oil in the rodless chamber of the working hydraulic cylinder is divided into three branches, one of which enters the oil port N of the hydraulic control one-way valve, one enters the front chamber through the H port of the two-way cartridge valve, and one enters the E port of the two-position three-way electromagnetic reversing valve.

[0048] In the fifth control mode, the hydraulic oil in the branch of the oil port N of the hydraulically controlled one-way valve flows normally, the hydraulic oil in the front chamber of the two-way cartridge valve is cut off, the valve core of the three-position four-way solenoid reversing valve is in the right position, and the hydraulic oil returns to the oil tank through the hydraulically controlled one-way valve and the three-position four-way solenoid reversing valve;

[0049] In the sixth control mode, the valve core of the three-position four-way solenoid directional valve is in the middle position, the hydraulic oil in the branch of the oil port N of the hydraulically controlled one-way valve is disconnected, the hydraulic oil in the front chamber of the two-way cartridge valve flows normally, and the hydraulic oil returns to the oil tank through the two-way cartridge valve;

[0050] In the seventh control mode, the valve core of the three-position four-way solenoid reversing valve is in the right position, the hydraulic oil entering the branch of the oil port N of the hydraulically controlled one-way valve flows normally, and the hydraulic oil entering the front chamber of the two-way cartridge valve flows normally. On the one hand, the hydraulic oil returns to the oil tank through the hydraulically controlled one-way valve and the three-position four-way solenoid reversing valve, and on the other hand, it returns to the oil tank through the two-way cartridge valve.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. Currently, there is no literature report on the technology of debugging large-scale wave energy power generation devices using their own energy conversion systems. This technology enables large-scale wave energy power generation devices to be debugged using their own energy conversion systems, greatly reducing the economic and time costs of debugging, and reducing the construction difficulty during offshore debugging.

[0053] 2. The system has a simple structure and is easy to install. During the design process, the corresponding working pressure of the hydraulic cylinder rodless chamber is designed according to the weight of the wave-absorbing float, and the pipelines and hydraulic components are connected according to the schematic diagram.

[0054] 3. No major changes are made to the original wave energy hydraulic energy conversion system. Only some standard hydraulic components and power systems are added to realize the system debugging function, which reduces the economic cost of the system and maintains the function of the original hydraulic energy conversion system to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 This is a diagram showing the composition of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention;

[0057] Figure 2This is a system diagram of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention when the wave absorbing float moves upward during normal operation;

[0058] Figure 3 This is a system diagram of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention when the wave-absorbing float moves downward in normal operation;

[0059] Figure 4 This is a system diagram of the hydraulic energy conversion system of an adjustable wave energy power generation device of the present invention when the wave absorbing float moves upward during the debugging;

[0060] Figure 5 This is a system diagram of the hydraulic energy conversion system of an adjustable wave energy power generation device of the present invention when the wave absorbing float moves upward and overflows during the debugging;

[0061] Figure 6 This is a system diagram of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention, when the wave-absorbing float moves downward and descends slowly during the debugging;

[0062] Figure 7 This is a system diagram of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention when the wave absorbing float moves downward at a medium speed during debugging;

[0063] Figure 8 This is a system diagram of a hydraulic energy conversion system of an adjustable wave energy power generation device according to the present invention when the wave absorbing float moves downward and the block drops rapidly during debugging.

[0064] Explanation of the accompanying symbols: 1. Oil tank; 2. Hydraulic pump; 3. Electric motor; 4. Frequency converter; 5. Overflow valve; 5.1. Adjusting spring; 6. Three-position four-way electromagnetic reversing valve; 6.1. Right return spring; 6.2. Left return spring; 6.3. Right electromagnetic relay; 6.4. Left electromagnetic relay; 7. Hydraulic-controlled one-way valve; 8. First ball valve; 9. Second ball valve; 10. First one-way valve; 11. Second one-way valve; 12. Working hydraulic cylinder; 12.1. Rod chamber; 12.2. Rodless chamber; 13. Two-way cartridge valve; 13.1. Front chamber; 13.2. Rear chamber; 14. Third one-way valve; 15. Two-position three-way electromagnetic reversing valve; 15.1. Electromagnetic relay; 15.2. Return spring; 16. Accumulator group. DETAILED DESCRIPTION

[0065] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0066] Example:

[0067] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0068] In the description of the present invention, "plurality" means at least two, such as two or three, unless otherwise specifically defined. Furthermore, unless otherwise specified or defined, the terms "mounted," "connected," and "connected" should be understood broadly, meaning, for example, fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention.

[0069] See also Figure 1 , Figure 1 The structural connection relationship of the system is demonstrated. An adjustable hydraulic energy conversion system of a wave energy power generation device includes an oil tank 1, a hydraulic pump 2, an electric motor 3, a frequency converter 4, a relief valve 5, a three-position four-way electromagnetic reversing valve 6, a hydraulically controlled one-way valve 7, a first ball valve 8, a second ball valve 9, a first one-way valve 10, a second one-way valve 11, a working hydraulic cylinder 12, a two-way cartridge valve 13, a third one-way valve 14, a two-position three-way electromagnetic reversing valve 15 and an accumulator group 16.

[0070] Furthermore, the oil tank 1 is provided with three interfaces, namely an oil suction port R, an oil return port S and a gas port Q. The oil suction port R is connected to the hydraulic pump 2 and is connected to the rod chamber 12.1 of the hydraulic cylinder 12 through the first one-way valve 10.

[0071] Furthermore, the outlet of the hydraulic pump 2 is connected to the oil inlet K of the relief valve 5. The relief valve 5 is provided with an adjusting spring 5.1, which can adjust the safety pressure of the system. The outlet J of the relief valve 5 is connected to the oil return port S of the oil tank 1.

[0072] Furthermore, the outlet of hydraulic pump 2 is connected to port C of three-position, four-way solenoid directional valve 6. This valve is equipped with a right return spring 6.1, a left return spring 6.2, a right electromagnetic relay 6.3, and a left electromagnetic relay 6.4. Initially, the valve core of three-position, four-way solenoid directional valve 6 is in the neutral position, port C is disconnected, and port B is connected to ports D and A. When the left electromagnetic relay 6.4 is energized, the valve core shifts leftward, assuming the left position, connecting ports C and D, and ports A and B. After power is removed, the valve core returns to the neutral position under the action of right return spring 6.1. When the right electromagnetic relay 6.3 is energized, the valve core shifts rightward, assuming the right position, connecting ports D and B, and ports C and A. After power is removed, the valve core returns to the neutral position under the action of left return spring 6.2.

[0073] Furthermore, the D port of the three-position four-way solenoid reversing valve 6 is connected to the main oil circuit oil port M of the hydraulically controlled one-way valve 7, the A port of the three-position four-way solenoid reversing valve 6 is connected to the control oil port L of the hydraulically controlled one-way valve 7, and the B port of the three-position four-way solenoid reversing valve 6 is connected to the return oil port S of the oil tank.

[0074] Furthermore, the outlet N of the main oil circuit of the hydraulically controlled one-way valve 7 has three branches. The first branch is connected to the rodless chamber 12.2 of the working hydraulic cylinder 12 through the first ball valve 8; the second branch is connected to the H port of the two-way cartridge valve 13; and the third branch is connected to the E port of the two-position three-way electromagnetic reversing valve 15.

[0075] Furthermore, the two-way cartridge valve 13 is provided with a front chamber 13.1, which is the main oil circuit and can connect or disconnect the H port and the I port; and is provided with a rear chamber 13.2, which is provided with an oil port O, which is connected to the G port of the two-position three-way electromagnetic reversing valve 15; the I port of the two-way cartridge valve 13 is connected to the return oil port S of the oil tank 1.

[0076] Furthermore, the 2 / 3-way solenoid directional valve 15 is equipped with an electromagnetic relay 15.1 and a return spring 15.2. When electromagnetic relay 15.1 is de-energized, the return spring 15.2 causes the valve core of the 2 / 3-way solenoid directional valve 15 to be in the right position, connecting ports E and G and disconnecting port F. When electromagnetic relay 15.1 is energized, the valve core of the 2 / 3-way solenoid directional valve 15 is in the left position, disconnecting port E and connecting ports G and F. After power is removed, the return spring 15.2 causes the valve core of the 2 / 3-way solenoid directional valve 15 to return to the right position.

[0077] Furthermore, the F port of the two-position three-way electromagnetic reversing valve 15 is connected to the third one-way valve 14 , and the first one-way valve 10 is connected to the oil return port S of the oil tank 1 .

[0078] Furthermore, a branch of the rod chamber 12 . 1 of the working hydraulic cylinder 12 is connected to the accumulator group 16 through the first one-way valve 10 ; a branch of the rodless chamber 12 . 2 of the working hydraulic cylinder 12 is connected to the air port of the oil tank 1 through the second ball valve 9 .

[0079] See also Figure 2-Figure 8 , Figure 2-Figure 8 The present invention demonstrates the adjustable wave energy hydraulic energy conversion control method. When the wave energy power generation device is operating normally at sea, the power station portion of the system, including the frequency converter 4, motor 3, and hydraulic pump 2, is in the off state. The relief valve 5 is in a low-pressure state, with its K and J ports disconnected. The right electromagnetic relay 6.3 and the left electromagnetic relay 6.4 of the three-position four-way solenoid reversing valve 6 are de-energized. The valve core of the three-position four-way solenoid reversing valve 6 is in the neutral position, port C is disconnected, and ports D, A, and B are connected. Ports H and I of the two-way cartridge valve 13 are blocked. The electromagnetic relay 15.1 of the two-position three-way solenoid reversing valve 15 is de-energized, the valve core is in the right position, ports E and G are connected, and port F is disconnected. The second ball valve 9 is in the open state, and the rodless chamber 12.2 of the working hydraulic cylinder 12 is connected to the gas port Q of the fuel tank 1 through the second ball valve 9. The first ball valve 8 is closed to prevent gas from the upper part of the fuel tank 1 from entering the system. The rod chamber 12.1 of the working hydraulic cylinder 12 is connected to the oil intake port R of the oil tank 1 through the first one-way valve 10, and is connected to the accumulator group 16 through the second one-way valve 11. Driven by the wave energy device's wave absorbing float, the working hydraulic cylinder 12 performs up and down reciprocating motion. When driven upward by the wave force, the piston of the working hydraulic cylinder 12 moves upward synchronously, and the hydraulic oil in the rod chamber 12.1 enters the accumulator group 16 through the second one-way valve 11, performing the energy storage and pressure stabilization process. At the same time, the rodless chamber 12.2 draws gas from the upper part of the oil tank 1, as shown in FIG. Figure 2 As shown. When the float moves downward due to gravity, the piston of the working hydraulic cylinder 12 moves downward synchronously, the rod chamber 12.1 draws hydraulic oil from the oil suction port R of the oil tank 1 through the first one-way valve 10, and the rodless chamber 12.2 discharges gas into the gas port Q of the oil tank 1, as shown. Figure 3 As shown, the working hydraulic cylinder 12 moves up and down in this way under the action of waves, causing the pressure of the accumulator group 16 to gradually increase, thereby driving the power generation unit to generate electricity. The rod chamber 12.1 is in a working state, and the rodless chamber 12.2 acts as a breathing hole.

[0080] When system debugging is required, the first ball valve 8 should be opened, the second ball valve 9 should be closed, the frequency converter 4 should be energized and started, the drive motor 3 and the hydraulic pump 2 should rotate, the hydraulic pump 2 should suck oil from the oil tank 1 and pump it into two oil circuits, entering the relief valve 5 and the three-position four-way electromagnetic reversing valve 6 respectively. Since the system is in normal working condition, the K port and the J port of the relief valve 5 are not connected and are in an open circuit state.

[0081] When debugging is required to simulate the upward movement of the wave-driven absorbing float, the left electromagnetic relay 6.4 of the three-position four-way electromagnetic reversing valve 6 is energized, and the valve core of the three-position four-way electromagnetic reversing valve 6 moves to the left. The valve core is in the left position. At this time, ports C and D are connected, and ports A and B are connected. The hydraulic oil pumped out by hydraulic pump 2 enters the main oil circuit M of the hydraulic control check valve 7 through ports C and D, and flows out from port N. The control oil port L of the hydraulic control check valve 7 is connected to the return oil port S of the oil tank 1 through ports A and B. Since the return oil port S of the oil tank 1 is pressureless, the control oil port L of the hydraulic control check valve 7 is also pressureless. The main oil circuit of the hydraulic control check valve 7 is unidirectional, that is, it can only flow from port M to port N. The main oil outlet of hydraulically controlled check valve 7 is divided into three branches. The first branch enters rodless chamber 12.2 of working hydraulic cylinder 12 through first ball valve 8; the second branch enters front chamber 13.1 of two-way cartridge valve 13; and the third branch enters port E of two-position, three-way solenoid directional valve 15. This third branch is the control oil port, primarily controlling the opening and closing of ports H and I of two-way cartridge valve 13. When electromagnetic relay 15.1 of two-position, three-way solenoid directional valve 15 is de-energized, the valve core is in the right position due to the action of return spring 15.2, connecting ports E and G. Hydraulic oil in the third branch flows through ports E and G into rear chamber 13.2 of two-way cartridge valve 13. At this time, since both the front chamber 13.1 and the rear chamber 13.2 of the two-way cartridge valve 13 flow in from the hydraulically controlled one-way valve 7, the pressures are the same. The front chamber 13.1 and the rear chamber 13.2 are separated by an internal valve core. The rear chamber 13.2 is also connected to the valve core via a spring, exerting a spring force. When the oil pressures in the front and rear chambers 13.1 and 13.2 are the same, the valve core moves toward the front chamber 13.1, disconnecting the H and I ports of the two-way cartridge valve 13. Therefore, most of the hydraulic oil pumped out by the hydraulic pump 2 ultimately enters the rodless chamber 12.2 of the working hydraulic cylinder. As the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 gradually increases, the pressure gradually increases, the piston continuously moves upward, and the wave-absorbing float connected to the working hydraulic cylinder 12 is gradually lifted. During the upward movement of the piston, the hydraulic oil in the rod chamber 12.1 is discharged synchronously and enters the accumulator group 16 through the second one-way valve 11, so that the oil is stored and the pressure is stabilized, and finally the power generation unit generates electricity. Figure 4 shown.

[0082] By adjusting the frequency of the inverter 4, the speed of the motor 3 is adjusted, and then the flow of the hydraulic pump 2 is controlled, the flow of hydraulic oil entering the working hydraulic cylinder 12 can be adjusted, and finally the speed of the upward movement of the piston of the working hydraulic cylinder 12 can be controlled to simulate different wave conditions.

[0083] During the debugging process of driving the wave-absorbing float to move upward, if the pipeline and the hydraulic valve block are blocked or misoperated, the pressure at the outlet of the hydraulic pump 2 will rise sharply. When it reaches the safety pressure set by the relief valve 5, the J port and the K port of the relief valve 5 will be connected to overflow to ensure that the outlet pressure of the hydraulic pump 2 is too high and causes danger. The pressure adjustment of the relief valve 5 is achieved by adjusting the spring 5.1. Figure 5 shown.

[0084] When debugging the downward movement of the wave-absorbing float, it is necessary to use the gravity of the wave-absorbing float to press down the piston of the working hydraulic cylinder 12, that is, to release the pressure in the rodless chamber 12.2 of the working hydraulic cylinder 12. The present invention sets three modes to control the speed of the downward movement of the wave-absorbing float, namely slow descent, medium descent, and fast descent. Regardless of whether it is slow, medium or fast descent, the rod chamber 12.1 of the working hydraulic cylinder 12 synchronously draws oil from the oil tank 1 to prepare for the next set of up and down reciprocating cycles, such as Figure 6 、 7 , as shown in Figure 8.

[0085] The hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 also splits into three branches after passing through the first ball valve 8. The first branch enters port N of the hydraulically controlled check valve 7, the second branch enters the front chamber 13.1 of the two-way cartridge valve 13, and the third branch enters port E of the two-position, three-way solenoid directional valve 15. The third branch is the control port, whose main function is to control the opening and closing of ports H and I of the two-way cartridge valve 13.

[0086] During slow descent, the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 returns to the oil tank 1 through the first branch, and the second branch is disconnected. The specific operation is as follows: disconnect the left electromagnetic relay 6.4 of the three-position four-way electromagnetic reversing valve 6, energize the right electromagnetic relay 6.3, and move the valve core of the three-position four-way electromagnetic reversing valve 6 to the rightmost position. At this time, ports A and C are connected, and ports B and D are connected. The outlet hydraulic oil of the hydraulic pump 2 enters the control oil port L of the hydraulic control check valve 7 through ports A and C. A pressure source enters the control oil port L, allowing the hydraulic control check valve 7 to conduct in the reverse direction, that is, the hydraulic oil can flow from port N to port M. The hydraulic oil in the rodless chamber 12.2 of the hydraulic cylinder 12 passes through the first branch, passes through ports N and M of the hydraulic control check valve 7, and ports D and B of the three-position four-way electromagnetic reversing valve 6, and flows to the return port S of the oil tank 1 and returns to the oil tank 1. At the same time, the electromagnetic relay 15.1 of the two-position three-way electromagnetic reversing valve 15 of the third branch is in the de-energized state, so the H port and the I port of the two-way cartridge valve 13 are not connected, and the second branch is disconnected. In this mode, since the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 returns to the oil tank 1 through the hydraulically controlled second one-way valve 11 and the three-position four-way electromagnetic reversing valve 6, the flow rate is relatively small, and it is in a slow descent mode, such as Figure 6 shown.

[0087] When descending at medium speed, the oil returns to the oil tank 2 through the second branch, and the first branch is disconnected. The specific operation is as follows: the frequency converter 4, the motor 3 and the hydraulic pump 2 can be temporarily shut down. At this time, the right electromagnetic relay 6.3 of the three-position four-way electromagnetic reversing valve 6 is disconnected. Under the action of the left return spring 6.2, the valve core of the three-position four-way electromagnetic reversing valve 6 returns to the middle position. Since the control oil port L of the hydraulically controlled one-way valve 7 is connected to the oil return port of the oil tank 1, no pressure can be established. Therefore, the hydraulically controlled one-way valve 7 cannot be reversed, that is, the oil cannot flow from the N port to the M port. The hydraulic oil in the rodless chamber 12.2 of the hydraulic cylinder 12 cannot flow back to the oil tank 1 through the first branch, and the first branch is disconnected. At the same time, the electromagnetic relay 15.1 of the two-position three-way electromagnetic reversing valve 15 of the third branch is energized, the valve core moves to the left and is in the left position, the E port is disconnected, the F port and the G port are connected, and the rear chamber 13.2 of the two-way cartridge valve 13 flows back to the oil tank 1 through the F port and the G port of the two-position three-way electromagnetic reversing valve 15 through the third one-way valve 14, so that the pressure in the rear chamber 13.2 is released, and the front chamber 13.1 of the two-way cartridge valve 13 and the rodless chamber 12.2 of the working hydraulic cylinder 12 are the same in pressure, which are at a relatively high pressure. Therefore, the pressure in the front chamber 13.1 of the two-way cartridge valve 13 is higher than that in the rear chamber 13.2, the valve core of the two-way cartridge valve 13 moves downward, the H port and the I port are connected, and the hydraulic oil in the rodless chamber 12.2 of the hydraulic cylinder 12 can flow back to the oil tank 1 through the second branch. The flow rate of the two-way cartridge valve 13 is much larger than that of the hydraulic control one-way valve 7. Therefore, the flow rate of the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 flowing back to the oil tank through the two-way cartridge valve 13 is relatively large, and it is in the medium-speed descending mode. Figure 7 shown.

[0088] During rapid descent, the first branch and the second branch are opened at the same time, and the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 quickly returns to the oil tank. The specific operation method is as follows: the frequency converter 4, the motor 3 and the hydraulic pump 2 are turned on, the right electromagnetic relay 6.3 of the three-position four-way solenoid reversing valve 6 is energized, and the valve core of the three-position four-way solenoid reversing valve 6 moves to the rightmost position. At this time, the A port and the C port are connected, and the B port and the D port are connected. The hydraulic oil in the rodless chamber 12.2 of the hydraulic cylinder 12 passes through the first branch, the N port and the M port of the hydraulic control one-way valve 7 and the D port and the B port of the three-position four-way solenoid reversing valve 6, and flows to the return oil port of the oil tank 1 and returns to the oil tank 1. The first branch is opened, together with the second branch opened above, so that the hydraulic oil in the rodless chamber 12.2 of the working hydraulic cylinder 12 flows back to the oil tank from the hydraulic control one-way valve 7 and the two-way cartridge valve 13 at the same time. At this time, the flow rate is greater and it is in a rapid descent mode, such as Figure 8 shown.

[0089] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0090] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. An adjustable wave energy hydraulic energy conversion system, characterized in that: include: Oil tank, hydraulic pump, overflow valve, three-position four-way solenoid directional valve, working hydraulic cylinder, two-way cartridge valve, hydraulically controlled one-way valve, two-position three-way solenoid directional valve and accumulator group, among which, The gas port Q of the oil tank is connected to the rodless chamber of the working hydraulic cylinder; The oil suction port R of the oil tank is connected to two branches, wherein one branch is connected to the rod chamber of the working hydraulic cylinder, and the other branch is connected to the inlet of the hydraulic pump; The oil return port S of the oil tank is connected to four branches, wherein one branch is connected to the outlet J of the overflow valve, one branch is connected to the B port of the three-position four-way solenoid reversing valve, one branch is connected to the F port of the two-position three-way solenoid reversing valve, and one branch is connected to the I port of the two-way cartridge valve; The oil inlet K of the overflow valve is connected to two branches, one of which is connected to the outlet of the hydraulic pump, and the other is connected to the C port of the three-position four-way electromagnetic reversing valve; The D port of the three-position four-way electromagnetic reversing valve is connected to the M port of the hydraulically controlled one-way valve, and the A port of the three-position four-way electromagnetic reversing valve is connected to the L port of the hydraulically controlled one-way valve; The N port of the hydraulically controlled one-way valve is connected to two branches, one of which is connected to the rodless chamber of the working hydraulic cylinder, and the other is connected to the H port of the two-way cartridge valve; The G port of the two-position three-way electromagnetic reversing valve is connected to the oil port O of the two-way cartridge valve; The rod chamber of the working hydraulic cylinder is also connected to the accumulator group; The H port of the two-way cartridge valve is also connected to two branches, wherein one branch is connected to the pipeline between the hydraulically controlled one-way valve and the working hydraulic cylinder, and the other branch is connected to the E port of the two-position three-way electromagnetic reversing valve.

2. The adjustable wave energy hydraulic energy conversion system according to claim 1, characterized in that: It also includes an electric motor and a frequency converter, wherein the hydraulic pump is coaxially connected to the electric motor, and the electric motor is driven by the frequency converter.

3. The adjustable wave energy hydraulic energy conversion system according to claim 1, characterized in that: It also includes a first ball valve and a second ball valve. The first ball valve is arranged downstream of the main oil circuit oil port N outlet of the hydraulically controlled one-way valve; the second ball valve is provided on the pipeline connecting the gas port Q of the oil tank and the rodless chamber of the working hydraulic cylinder.

4. The adjustable wave energy hydraulic energy conversion system according to claim 1, characterized in that: It also includes a first one-way valve, a second one-way valve and a third one-way valve, wherein the first one-way valve is arranged on a pipeline connecting the oil suction port R of the oil tank and the rod chamber of the working hydraulic cylinder, the second one-way valve is arranged on a pipeline connecting the rod chamber of the working hydraulic cylinder and the accumulator group, and the third one-way valve is arranged on a pipeline connecting the oil return port of the oil tank and the F port of the two-position three-way electromagnetic reversing valve.

5. An adjustable wave energy hydraulic energy conversion control method, based on the adjustable wave energy hydraulic energy conversion system according to any one of claims 1 to 4, characterized in that: include: The first control mode and the second control mode are used for the system in the working mode, wherein the first control mode is used to simulate the working condition when the wave-absorbing float moves upward; The second control mode is used to simulate the working condition when the wave-absorbing float moves downward; The third and fourth control modes used for the system in the debugging mode, wherein the third control mode is used to simulate the working condition of the wave-driven wave-absorbing float moving upward, and the fourth control mode is used to simulate the working condition when the pipeline and the hydraulic valve block are blocked or misoperated in the third control mode; The fifth control mode, the sixth control mode and the seventh control mode are used for the system in the debugging mode, and the fifth control mode, the sixth control mode and the seventh control mode are used to simulate the working condition that the wave drives the wave-absorbing float to move downward at a gradually increasing speed.

6. The adjustable wave energy hydraulic energy conversion control method according to claim 5 is characterized in that: The first control mode and the second control mode both include the following process: The inverter, motor and hydraulic pump are in the off state; The relief valve is in the first pressure state, and its K port and J port are in the disconnected state; The valve core of the three-position four-way solenoid directional valve is in the middle position, port C is disconnected, and ports D, A and B are connected; The H port and I port of the two-way cartridge valve are blocked; The valve core of the two-position three-way electromagnetic reversing valve is in the right position, the E port and the G port are connected, and the F port is disconnected; In the first control mode, the second ball valve is in the open state; the first ball valve is in the closed state; the working hydraulic cylinder, driven by the wave absorbing float of the wave energy device, performs up and down reciprocating motion. When driven upward by the wave force, the piston of the working hydraulic cylinder moves upward synchronously, and the hydraulic oil in the rod chamber of the working hydraulic cylinder enters the accumulator group for energy storage and pressure stabilization; the rodless chamber of the working hydraulic cylinder draws gas from the upper part of the oil tank; In the second control mode, the second ball valve is in the open state; the first ball valve is in the closed state; the working hydraulic cylinder is driven by the wave-absorbing float of the wave energy device to perform reciprocating motion up and down. When the float moves downward under the force of gravity, the piston of the working hydraulic cylinder moves downward synchronously. The rod chamber of the working hydraulic cylinder draws hydraulic oil from the oil suction port R of the oil tank, and the rodless chamber of the working hydraulic cylinder discharges the gas into the gas port Q of the oil tank.

7. The adjustable wave energy hydraulic energy conversion control method according to claim 5, characterized in that: The third control mode and the fourth control mode both include the following processes: The first ball valve is in the open state; The second ball valve is in the closed state; The inverter is powered on and started, driving the motor and hydraulic pump to rotate. The hydraulic pump draws oil from the oil tank and pumps it into the relief valve and the three-position four-way solenoid reversing valve; The valve core of the three-position four-way solenoid directional valve is in the left position. At this time, port C is connected to port D, and port A is connected to port B. One branch of the hydraulic oil pumped out by the hydraulic pump enters the rodless chamber of the working hydraulic cylinder through the three-position four-way electromagnetic reversing valve and the hydraulically controlled one-way valve, and the other branch enters the two-way cartridge valve through the three-position four-way electromagnetic reversing valve and the hydraulically controlled one-way valve; the H port and the I port of the two-way cartridge valve are not connected; The valve core of the two-position three-way solenoid directional valve is in the right position, and the E port and the G port are connected; The hydraulic oil in the rodless chamber of the working hydraulic cylinder gradually increases, the piston continuously moves upward, and the wave-absorbing float connected to the working hydraulic cylinder is gradually lifted up; in the process of the piston moving upward, the hydraulic oil in the rod chamber of the working hydraulic cylinder is simultaneously discharged and enters the accumulator group to perform the energy storage and pressure stabilization process; wherein, In the third control mode, the K port and the J port of the relief valve are disconnected and in an open circuit state; in the fourth control mode, the K port and the J port of the relief valve are connected to perform overflow.

8. The adjustable wave energy hydraulic energy conversion control method according to claim 5 is characterized in that: The fifth control mode, the sixth control mode, and the seventh control mode all include the following processes: The rod chamber of the working hydraulic cylinder synchronously draws oil from the oil tank to prepare for the next set of up and down reciprocating cycle motion; The hydraulic oil in the rodless chamber of the working hydraulic cylinder is divided into three branches, one of which enters the oil port N of the hydraulic control one-way valve, one enters the front chamber through the H port of the two-way cartridge valve, and one enters the E port of the two-position three-way electromagnetic reversing valve. In the fifth control mode, the hydraulic oil in the branch of the oil port N of the hydraulically controlled one-way valve flows normally, the hydraulic oil in the front chamber of the two-way cartridge valve is cut off, the valve core of the three-position four-way solenoid reversing valve is in the right position, and the hydraulic oil returns to the oil tank through the hydraulically controlled one-way valve and the three-position four-way solenoid reversing valve; In the sixth control mode, the valve core of the three-position four-way solenoid directional valve is in the middle position, the hydraulic oil in the branch of the oil port N of the hydraulically controlled one-way valve is disconnected, the hydraulic oil in the front chamber of the two-way cartridge valve flows normally, and the hydraulic oil returns to the oil tank through the two-way cartridge valve; In the seventh control mode, the valve core of the three-position four-way solenoid reversing valve is in the right position, the hydraulic oil entering the branch of the oil port N of the hydraulically controlled one-way valve flows normally, and the hydraulic oil entering the front chamber of the two-way cartridge valve flows normally. On the one hand, the hydraulic oil returns to the oil tank through the hydraulically controlled one-way valve and the three-position four-way solenoid reversing valve, and on the other hand, it returns to the oil tank through the two-way cartridge valve.

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