Automatic drainage equipment and method suitable for point floating wave energy power generation device

Abstract

The present invention provides an automatic drainage device and method suitable for a point floating wave energy power generation device, wherein the point floating wave energy power generation device comprises a float system and an energy conversion system, wherein the automatic drainage device comprises an automatic drainage device without power, wherein the automatic drainage device without power comprises a drainage push plate, wherein the drainage push plate is placed in the shell of the energy conversion system and forms a closed cavity with the lower part of the inner cavity of the shell; wherein the drainage push plate comprises an inner plate and an outer plate, wherein two outer plates are provided, and the two outer plates are respectively provided at both ends along the horizontal direction of the inner plate; wherein the outer plate is connected to the inner plate by a hinge; wherein a reset part is provided at the hinge connection; and the design realizes a fast, timely and efficient drainage function of "draining water while working". The device saves a huge expenditure on the purchase of drainage equipment and power consumption, and reduces the operating cost. At the same time, the simple automatic drainage device without power reduces the volume of a single point floating wave energy power generation device and increases the number of power generation devices per unit area.

Description

Technical Field

[0001] The invention belongs to the technical field of renewable energy power generation, and in particular relates to an automatic drainage device and method suitable for a point floating wave energy power generation device. Background Art

[0002] Ocean wave energy refers to the kinetic energy and potential energy of waves on the ocean surface. The global wave energy reserves are huge. On every square kilometer of sea surface, the fluctuating waves contain about 300,000 kilowatts of energy, and the wave energy that can be developed is about 3 billion kilowatts. It can be seen that wave energy has great development and application value. The exploitable amount of wave energy resources in my country is estimated to be up to 12.84 million kW, and the nearshore resources are mainly concentrated in Zhejiang, Guangdong, Fujian, Shandong, Hainan, Jiangsu and other places. At present, the wave energy power generation technology types at home and abroad are roughly divided into oscillating water column, point absorption (oscillating float), raft type, pendulum type, overpass type (contracted wave channel), etc. The oscillating water column type has the disadvantages of low conversion efficiency and unstable power generation under small wind and small waves, which cannot meet the actual commercial needs and has been gradually abandoned by the industry. The contracted wave channel type has strict requirements on the terrain and is difficult to promote widely. Although the raft type has the advantage of high single-machine power, there is great uncertainty in its safety performance. Compared with the above forms, the point floating type has the remarkable characteristics of lower requirements for wave energy resource conditions, flexible layout, and higher conversion efficiency under small waves. It is in line with the characteristics of my country's wave energy resources and has gradually become a major technical direction for the development of my country's wave energy technology.

[0003] Point floating wave energy power generation devices generally consist of several parts, including an oscillating float, a connecting rod, an energy conversion system, a base, and cables. During the power generation process of the power generation device, the connecting rod continuously moves up and down as a piston, which is input into the energy conversion system as a power source. Since the working environment is always in the marine environment, sealing protection is required at the gap between the connecting rod and the shell of the energy conversion system. Once the sealing protection measures fail, seawater will enter the energy conversion system through the gap, causing great damage to the internal equipment, resulting in the equipment being unable to operate safely. The sealing problem (safety) of point floating power generation devices has also received increasing attention. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic drainage device and method suitable for a point floating wave energy power generation device, which solves the sealing problem of the existing point floating power generation device.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides an automatic drainage device suitable for a point-floating wave energy power generation device, wherein the point-floating wave energy power generation device comprises a float system and an energy conversion system, wherein the automatic drainage device comprises a powerless automatic drainage device, wherein the powerless automatic drainage device comprises a drainage push plate, wherein the drainage push plate is disposed in a housing of the energy conversion system and forms a closed cavity with the lower part of the housing inner cavity;

[0007] The drainage push plate comprises an inner plate and an outer plate, wherein two outer plates are provided, and the two outer plates are respectively provided at both ends of the inner plate in a horizontal direction;

[0008] The outer plate is connected to the inner plate via a hinge; a reset member is provided at the hinge connection;

[0009] The bottom of the shell is provided with a plurality of drainage openings, and the drainage openings are communicated with the closed cavity.

[0010] Preferably, the outer panel is connected to the inner panel via a hinge.

[0011] Preferably, the reset element is a return spring wire.

[0012] Preferably, the drainage push plate is a rectangular plate, and sealing rings are mounted around the edges of the drainage push plate.

[0013] Preferably, the non-electric automatic drainage equipment includes a connecting rod, which is an inverted L-shaped structure and is provided with two connecting rods; the two connecting rods are arranged in a mirror-like structure; the vertical ends of the two connecting rods are connected to the inner side plate; the horizontal ends of the two connecting rods are connected to the float system.

[0014] Preferably, each drain outlet is provided with a one-way sealing valve.

[0015] Preferably, the energy conversion system comprises a housing, a hydraulic cylinder, a hydraulic subsystem and a generator, wherein the housing is a rectangular parallelepiped space, and the hydraulic cylinder, the hydraulic subsystem and the generator are placed inside the housing; the output end of the hydraulic cylinder is connected to the input end of the hydraulic subsystem; the output end of the hydraulic subsystem is connected to the input end of the generator;

[0016] The piston in the float system is placed in the hydraulic cylinder, and the hydraulic cylinder forms two closed chambers;

[0017] The hydraulic subsystem includes an integrated valve block and a hydraulic motor, wherein the integrated valve block is provided with a high-pressure side hydraulic oil outlet and a low-pressure side hydraulic oil return port; the high-pressure side hydraulic oil outlet is connected to the hydraulic motor; the hydraulic oil outlet on the hydraulic motor is connected to the low-pressure side hydraulic oil return port through a pipeline; the two input ends of the integrated valve block are respectively connected to the two closed chambers of the hydraulic cylinder;

[0018] A solenoid valve is arranged on the connecting pipeline between the hydraulic oil outlet on the high-pressure side and the hydraulic motor; the solenoid valve is connected to an external control system for controlling the start and stop of its operation.

[0019] An automatic drainage method applicable to a point floating wave energy power generation device, based on the automatic drainage device applicable to a point floating wave energy power generation device, comprises the following steps:

[0020] When the floating power generation device is working normally, the connecting rod and the drainage push plate of the power-free automatic drainage equipment follow the float system to perform up and down drainage actions in real time; when the sealing failure occurs in the shell gap, the seawater entering the shell causes the outer plate of the drainage push plate to fold inward due to gravity, so that the seawater will quickly enter the space formed between the drainage push plate and the bottom of the energy conversion system shell; when there is no seawater on the upper part of the outer plate, the reset member resets the outer plate to be parallel to the inner plate to form a closed space; the drainage push plate moves up and down to push the seawater out of the energy conversion system shell from the drain port, realizing the power-free automatic drainage function.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides an automatic drainage device and method suitable for point floating wave energy power generation devices, which adds a drainage device that does not require electrical energy inside the energy conversion system, saving huge drainage equipment purchase expenses and electrical energy consumption, and reducing operating costs. At the same time, the simple automatic non-electrical drainage device reduces the volume of a single point floating wave energy power generation device and increases the number of power generation devices per unit area.

[0023] Furthermore, since the drainage device simply moves with the external wave energy, it is not easily damaged and does not require regular maintenance and replacement costs, saving maintenance costs and time. At the same time, the device can operate continuously for 24 hours without the need for personnel supervision or the use of monitoring equipment. It is simple, convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a general structural diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the energy conversion system involved in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the drainage push plate involved in the present invention;

[0027] Figure 4 It is a working schematic diagram of the drainage push plate involved in the invention;

[0028] Among them, 1. float system 2. energy conversion system 3. cable 4. supporting foundation 5. automatic drainage equipment without electricity 1-1, top float 1-2, piston rod 1-3, piston 2-1, shell 2-2, hydraulic cylinder 2-3, hydraulic subsystem 2-4, hydraulic oil 2-5, generator 5-1, connecting rod 5-2, drainage push plate 5-3, one-way sealing valve 2-3-1, integrated valve block 2-3-2, hydraulic motor 2-3-3, pipeline 5-2-1, drainage inner push plate 5-2-2, drainage outer push plate. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, the present invention provides an automatic drainage device suitable for a point-floating wave energy power generation device, comprising a float system 1, an energy conversion system 2, a cable 3, a support foundation system 4 and a power-free automatic drainage device 5; wherein the float system 1 is used to convert the wave energy in the ocean into the mechanical energy of the up and down movement of the piston rod; the energy conversion system 2 is used to finally convert the mechanical energy of the piston rod into electrical energy through the internal hydraulic subsystem and the generator; finally, the generated electrical energy is transmitted to the onshore transformer station through the cable 3 at the output end of the generator for grid-connected power generation.

[0031] The float system 1 comprises a top float 1-1 and a piston rod 1-2, wherein the top float 1-1 floats on the sea surface and is an energy absorbing component of the entire wave energy power generation device, and moves up and down following the rise and fall of waves.

[0032] The piston rod 1-2 is arranged at the bottom at the geometric center of the top float 1-1; the piston rod 1-2 and the float 1-1 are connected by threads; the other end of the piston rod 1-2 enters the hydraulic cylinder 2-2 cavity of the energy conversion system 2, and a piston 1-3 is arranged at its end.

[0033] The connection mode of the piston rod 1-2 and the piston 1-3 is the same as the threaded connection mode.

[0034] The supporting foundation system 4 plays a supporting and fixing role. One end of the supporting foundation system 4 is fixed on the seabed, and the other end is fixed on the bottom of the shell of the energy conversion system 2.

[0035] The non-electric automatic drainage device 5 is placed in the shell of the energy conversion system 2; it includes a connecting rod 5-1 and a drainage push plate 5-2, wherein the connecting rod 5-1 is an inverted L-shaped structure, and there are two of them, and the two connecting rods 5-1 are arranged in a mirror-image structure.

[0036] The vertical ends of the two connecting rods 5 - 1 are connected to the two ends of the drainage push plate 5 - 2 ; the horizontal ends of the two connecting rods 5 - 1 are connected to the piston rod 1 - 2 of the float system 1 .

[0037] The drainage push plate 5-2 is a rectangular thin aluminum alloy plate. The drainage push plate 5-2 is placed in the shell of the energy conversion system 2, and a sealing ring is provided between the inner wall of the shell to seal the gap between the inner wall of the shell and the drainage push plate, forming a closed chamber with the lower part of the shell 2-1.

[0038] The connecting rod 5 - 1 moves up and down following the float system 1 , thereby driving the drainage push plate 5 - 2 to move up and down to push the seawater that flows into the enclosed space out of the device once the seal fails.

[0039] The up and down movement range of the connecting rod 5-1 and the drainage push plate 5-2 of the drainage equipment 5 is the same as the designed allowable movement range of the 1-3 piston in the hydraulic cylinder 2-2, that is, the size of the piston movement is related to the size of the external waves. When the external wave energy is not large, the piston moves up and down normally. When the external wave is too large and exceeds the allowable movement range of the piston, the remote operator will close the solenoid valve on the high-pressure side hydraulic pipeline through the control system, so that the entire oil circuit is locked and does not flow, and the piston does not move. The space design of the connecting rod 5-1 and the drainage push plate 5-2 ensures that the upper and lower end movement stroke requirements are met and they will not hit the housing 2-1 or the hydraulic equipment.

[0040] like Figure 3 , Figure 4 As shown, the drainage push plate 5-2 includes an inner plate 5-2-1 and an outer plate 5-2-2, wherein two outer plates 5-2-2 are provided, and the two outer plates 5-2-2 are respectively provided at both ends of the drainage push plate 5-2 in the horizontal direction.

[0041] The outer side plate 5-2-2 and the inner side plate 5-2-1 are connected via hinges.

[0042] A return spring wire is arranged at the hinge connection; when there is no external force, the inner plate 5-2-1 and the outer plate 5-2-2 are in a parallel state; when seawater enters the shell 2-1, it flows to the upper edge of the outer plate 5-2-2 of the drainage push plate, and due to the gravity of the seawater, the outer plate 5-2-2 folds inward, and the seawater enters the space formed by the shell 2-1 and the drainage push plate 5-2; when there is no seawater on the upper edge of the outer plate 5-2-2, the return spring wire resets it, thus forming a closed chamber.

[0043] Therefore, the outer side plate of the drainage push plate 5-2 is a one-way opening plate (seawater can only flow in but not out).

[0044] like Figure 2As shown, the energy conversion system 2 includes a shell 2-1, a hydraulic cylinder 2-2, a hydraulic subsystem 2-3 and a generator 2-5, wherein the shell 2-1 is a rectangular space, the outside of which is immersed in seawater; the hydraulic cylinder 2-2, the hydraulic subsystem 2-3 and the generator 2-5 are placed in the shell 2-1.

[0045] The output end of the hydraulic subsystem 2 - 3 is connected to the input end of the generator 2 - 5 .

[0046] The hydraulic cylinder 2-2 is automatically divided into two closed chambers because the piston 1-3 is placed therein; both chambers of the hydraulic cylinder 2-2 have an inlet and outlet port connected to the hydraulic subsystem 2-3, thereby connecting the output end of the hydraulic cylinder with the input end of the hydraulic subsystem.

[0047] Hydraulic oil 2-4 is contained in each pipeline of the hydraulic cylinder and the hydraulic subsystem.

[0048] The hydraulic subsystem 2-3 includes an integrated valve block 2-3-1, a hydraulic motor 2-3-2 and related pipelines 2-3-3, wherein the piston rod 1-2 is provided with one end of the piston 1-3 inserted into the inner cavity of the hydraulic cylinder 2-2, so that the hydraulic cylinder 2-2 forms two closed chambers.

[0049] The two closed chambers of the hydraulic cylinder 2-2 are connected to the port of the integrated valve block 2-3-1 through a hydraulic oil hose; the integrated valve block 2-3-1 is provided with a high-pressure side hydraulic oil outlet and a low-pressure side hydraulic oil return port.

[0050] The high-pressure side hydraulic oil outlet is connected to the hydraulic motor 2-3-2 through a pipeline 2-3-3; the hydraulic oil outlet on the hydraulic motor 2-3-2 is connected to the low-pressure side hydraulic oil return port through a pipeline, thereby forming a circulation loop of the hydraulic oil.

[0051] Inside the integrated valve block 2-3-1, two ports are provided with one-way valves (A, B) in the direction of "port→high pressure side" respectively, which are connected to the high pressure side hydraulic oil outlet; similarly, two one-way valves (C, D) in the direction of "low pressure side→two ports" are provided at the low pressure side hydraulic oil return port inside the integrated valve block. In this way, when the piston 1-3 moves up and down in the hydraulic cylinder 2-2, the hydraulic oil in a certain chamber (upper or lower) of the hydraulic cylinder will flow to the port of the integrated valve block 2-3-1 and then flow through the one-way valve of "port→high pressure side" to generate hydraulic energy and flow to the high pressure side pipeline. The hydraulic oil at the low pressure side hydraulic oil return port flows back to the other chamber (lower or upper) through the one-way valve of "low pressure side→port". In this way, while ensuring that the properties of the high pressure side and low pressure side pipelines never change, the two sets of hydraulic oil circulation loops (loop A, D or loop B, C) are completed.

[0052] The solenoid valve is connected to an external control system for controlling the start and stop of its operation.

[0053] The up and down movement range of the connecting rod 5-1 and the drainage push plate 5-2 is the same as the designed allowable movement range of the piston 1-3 in the hydraulic cylinder 2-2, and the size of the piston movement is related to the size of the external waves. When the external wave energy is not large, the piston moves up and down within the normal design allowable stroke range. When the external waves are too large and exceed the allowable movement range of the piston, the remote operator will close the solenoid valve on the high-pressure side hydraulic pipeline through the external control system, so that the entire oil circuit is locked and does not flow, and the piston does not move. Therefore, when reserving space for the connecting rod 5-1 and the drainage push plate 5-2, it is ensured that the upper and lower end movement distance requirements are met and they will not touch the housing 2-1 or hydraulic equipment.

[0054] The hydraulic motor 2-3-2 is connected to the generator 2-5, so that when the high-pressure hydraulic oil flows through the hydraulic motor 2-3-2, the hydraulic energy in the above-mentioned high-pressure side oil circuit will be converted into the rotational mechanical energy of the hydraulic motor, and then drive the generator 2-5 to operate and generate electricity. The output end of the generator is connected to the cable 3 to transmit the generated electric energy to the onshore transformer station for grid-connected power generation, thereby realizing the power generation function of the point floating wave energy power generation device.

[0055] In summary, the power generation process of the point floating wave energy power generation device mainly relies on the float system 1 and the energy conversion system 2 to generate electrical energy. The float system follows and absorbs wave energy to move up and down, driving the piston 1-3 to move up and down in the hydraulic cylinder 2-2. Then, through the energy conversion system (mainly relying on the hydraulic subsystem 2-3 and the hydraulic oil 2-4), the mechanical energy of the up and down movement is converted into hydraulic energy with pressure and flow rate, and finally the hydraulic motor 2-3-2 and the generator 2-5 realize the process of converting hydraulic energy into electrical energy.

[0056] The bottom of the housing 2-1 is provided with a plurality of drain ports, each of which is provided with a one-way sealing valve 5-3.

[0057] When the pressure in the inner cavity formed between the shell and the drainage push plate 5-2 reaches a certain level, the one-way sealing valve 5-3 works. At this time, seawater can only flow out, and external seawater cannot flow in.

[0058] The working principle of the present invention is:

[0059] Power generation process: The float 1-1 in the float system 1 of the point floating wave energy power generation device moves up and down following the crest and trough of the wave energy, thereby driving the piston rod 1-2 and the piston 1-3 in the hydraulic cylinder 2-2 in the energy conversion system 2 to move up and down; the hydraulic cylinder 2-2 and the hydraulic subsystem 2-3 oil circuit in the energy conversion system 2 are filled with hydraulic oil 2-4, and the reciprocating motion of the piston 1-3 pushes the hydraulic oil 2-4 to flow in the oil circuit composed of the hydraulic cylinder 2-2 and the hydraulic subsystem 2-3, and drives the hydraulic motor 2-3-2 to rotate so that the generator 2-5 generates electricity. In this way, the wave energy in the ocean is converted into electrical energy, and the resulting electrical energy is transmitted and transported using the cable 3.

[0060] Drainage process: When the floating power generation device moves up and down and works normally, the one-way valve in the pipeline is in an open state, and the piston rod 1-2 of the float system 1 also moves up and down, driving the inverted L-shaped connecting rod 5-1 to move up and down, and then driving the drainage push plate 5-2 to move up and down to perform drainage action at all times. Once the sealing failure occurs in the shell gap, the seawater entering the shell 2-1 will cause the outer plate 5-2-2 of the drainage push plate 5-2 to fold inward due to gravity, so that the seawater will quickly enter the space formed between the drainage push plate and the bottom of the energy conversion system shell 2-1. When there is no seawater on the upper edge of the outer plate 5-2-2, the spring at the hinge will quickly reset the outer end plate to be parallel to the inner end plate to form a closed space. The drainage push plate 5-2 moves up and down to push the seawater out of the one-way sealing valve 5-3 to discharge the outside of the energy conversion system shell 2-1, realizing the drainage function of "draining water while working". The seawater can be discharged quickly, timely and efficiently to avoid the accumulation of seawater in the internal system for a long time, causing the internal equipment to fail to work normally.

Claims

1. An automatic drainage device suitable for a point-floating wave energy power generation device, the point-floating wave energy power generation device comprising a float system (1) and an energy conversion system (2), characterized in that: The automatic drainage device comprises a non-electrical automatic drainage device (5), the non-electrical automatic drainage device comprises a drainage push plate (5-2), the drainage push plate (5-2) is placed in the shell of the energy conversion system (2), and forms a closed cavity with the lower part of the inner cavity of the shell; The drainage push plate (5-2) comprises an inner plate (5-2-1) and an outer plate (5-2-2), wherein two outer plates (5-2-2) are provided, and the two outer plates (5-2-2) are respectively provided at two ends of the inner plate (5-2-1) in a horizontal direction; The outer plate (5-2-2) and the inner plate (5-2-1) are connected via a hinge; a reset member is provided at the hinge connection; The bottom of the shell is provided with a plurality of drain ports, the drain ports being connected to the enclosed cavity; The non-electric automatic drainage device (5) comprises a connecting rod (5-1), wherein the connecting rod (5-1) is an inverted L-shaped structure, and two connecting rods (5-1) are provided; the two connecting rods (5-1) are arranged in a mirror-image structure; the vertical ends of the two connecting rods (5-1) are connected to the inner side plate (5-2-1); the horizontal ends of the two connecting rods (5-1) are connected to the float system (1); The energy conversion system (2) comprises a housing (2-1), a hydraulic cylinder (2-2), a hydraulic subsystem (2-3) and a generator (2-5), wherein the housing (2-1) is a rectangular parallelepiped space, and the hydraulic cylinder (2-2), the hydraulic subsystem (2-3) and the generator (2-5) are arranged in the housing (2-1); the output end of the hydraulic cylinder (2-2) is connected to the input end of the hydraulic subsystem (2-3); the output end of the hydraulic subsystem (2-3) is connected to the input end of the generator (2-5); The piston (1-3) in the float system is placed in the hydraulic cylinder (2-2), and the hydraulic cylinder (2-2) forms two closed chambers; The hydraulic subsystem (2-3) comprises an integrated valve block (2-3-1) and a hydraulic motor (2-3-2), wherein the integrated valve block (2-3-1) is provided with a high-pressure side hydraulic oil outlet and a low-pressure side hydraulic oil return port; the high-pressure side hydraulic oil outlet is connected to the hydraulic motor (2-3-2); the hydraulic oil outlet on the hydraulic motor (2-3-2) is connected to the low-pressure side hydraulic oil return port via a pipeline; the two input ends of the integrated valve block (2-3-1) are respectively connected to the two closed chambers of the hydraulic cylinder (2-2); A solenoid valve is provided on the connecting pipeline between the high-pressure side hydraulic oil outlet and the hydraulic motor (2-3-2); the solenoid valve is connected to an external control system for controlling the start and stop of its operation.

2. The automatic drainage device suitable for a point floating wave energy power generation device according to claim 1, characterized in that: The outer plate (5-2-2) and the inner plate (5-2-1) are connected via hinges.

3. The automatic drainage device suitable for a point floating wave energy power generation device according to claim 1, characterized in that: The reset element is a return spring wire.

4. The automatic drainage device suitable for a point floating wave energy power generation device according to claim 1, characterized in that: The drainage push plate (5-2) is a rectangular plate, and sealing rings are mounted around the edges of the drainage push plate (5-2).

5. The automatic drainage device suitable for a point floating wave energy power generation device according to claim 1, characterized in that: Each drain port is provided with a one-way sealing valve (5-3).

6. An automatic drainage method suitable for a point floating wave energy power generation device, characterized in that: An automatic drainage device suitable for a point floating wave energy power generation device according to any one of claims 1 to 5 comprises the following steps: When the point floating power generation device is working normally, the connecting rod (5-1) and the drainage push plate (5-2) of the powerless automatic drainage device follow the float system (1) to perform up and down drainage actions in real time; when the sealing failure occurs in the shell gap, the seawater entering the shell (2-1) causes the outer plate (5-2-2) of the drainage push plate (5-2) to be folded inwards due to gravity, so that the seawater quickly enters the space formed between the drainage push plate and the bottom of the energy conversion system shell (2-1); when there is no seawater on the upper part of the outer plate (5-2-2), the reset member resets the outer plate to be parallel to the inner plate to form a closed space; the drainage push plate (5-2) moves up and down to push the seawater out of the energy conversion system shell (2-1) from the drainage port, thereby realizing the powerless automatic drainage function.

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