CN111692038A - Wave energy storage power generation system based on mechanical-hydraulic coupling transmission - Google Patents

Wave energy storage power generation system based on mechanical-hydraulic coupling transmission Download PDF

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Publication number
CN111692038A
CN111692038A CN202010579687.4A CN202010579687A CN111692038A CN 111692038 A CN111692038 A CN 111692038A CN 202010579687 A CN202010579687 A CN 202010579687A CN 111692038 A CN111692038 A CN 111692038A
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energy
hydraulic
mechanical
guide
power generation
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Chinese (zh)
Inventor
刘鹏
史宏达
宋文杰
冯亮
温京亚
蒋庆林
李新娟
高金龙
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Oceanographic Instrumentation Research Institute Shandong Academy of Sciences
Institute of Oceanographic Instrumentation Shandong Academy of Sciences
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Oceanographic Instrumentation Research Institute Shandong Academy of Sciences
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Priority to CN202010579687.4A priority Critical patent/CN111692038A/en
Publication of CN111692038A publication Critical patent/CN111692038A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/20—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" wherein both members, i.e. wom and rem are movable relative to the sea bed or shore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The invention belongs to the technical field of ocean new energy, and relates to an ocean wave energy power generation device. The system comprises an energy capturing device, a mechanical transmission device and a hydraulic transmission device, wherein the energy capturing device is used for capturing wave energy, the mechanical transmission device is connected with the energy capturing device and used for converting the wave energy into mechanical energy, and the hydraulic transmission device is connected with the mechanical transmission device and used for converting the mechanical energy into hydraulic energy; the hydraulic transmission device is connected with the power generation system. The invention discloses a wave energy storage power generation system based on mechanical-hydraulic coupling transmission, which has the beneficial effects that: by adopting a mechanical-hydraulic coupling transmission mode, the device not only can adapt to complex and variable sea conditions, ensure that the floater works reliably and simultaneously captures wave energy to the maximum extent, but also can realize continuous, stable and controllable output of energy. The hydraulic transmission system controls the multiple groups of energy accumulators to realize the cooperative and ordered work of the multiple groups of energy accumulators, so that the utilization rate of wave energy can be improved, and the waste of the wave energy is reduced.

Description

Wave energy storage power generation system based on mechanical-hydraulic coupling transmission
Technical Field
The invention belongs to the technical field of ocean new energy, and relates to an ocean wave energy power generation device.
Background
The close combination of island energy demonstration and deep sea resource development is a development direction of ocean energy development technology in China. In recent years, ocean energy development in China mainly takes power generation as a main part, and in general, wave energy power generation devices in China are developed in a plurality of types. The oscillating float has the advantages of simple structure, relatively high energy conversion efficiency and the like, and is more suitable for the characteristics of short wave period and relatively low energy density of offshore sea conditions in China. The oscillating floater type wave energy device utilizes a floater as a wave energy absorption carrier, the floater generates reciprocating motion under the action of wave energy, and then the power generation device is pushed to generate power through mechanical transmission or hydraulic transmission and the like.
The existing mechanical transmission wave energy power generation devices (CN 201662008, CN 201711176186) adopt a chain transmission mode, a flywheel is adopted at the output end of a chain wheel to store energy, and a generator is driven to generate power, so that continuous energy can be output to a certain extent, but the output performance of the flywheel cannot be effectively controlled, so that the power generation stability is greatly influenced by a wave condition. Furthermore, this type of chain transmission generally passes through the interior of the float, thus leaving room in the middle of the float, which makes inefficient use of the float's capacity to capture wave energy (CN 201610262008); and a square hole or other special-shaped holes arranged in the middle of the floater are easy to form stress concentration points under the action of wave force load, thereby causing the damage of the floater (CN 201711176186).
The existing hydraulic transmission wave energy power generation system mostly adopts a hydraulic cylinder as an execution element, and a floater drives the hydraulic cylinder to discharge hydraulic oil under the action of waves, so that the pressure of the hydraulic oil is low, high-pressure oil needs to be provided for the hydraulic system after the pressure of a supercharger is increased, and the application difficulty is increased. In addition, the hydraulic cylinder is adopted as an actuating element and is suitable for sea conditions with small wave height, and when the wave height is high, the movement of the floater is limited by the length of the hydraulic cylinder, so that the hydraulic cylinder cannot adapt to complicated and variable sea conditions in deep and far sea areas.
Disclosure of Invention
The invention aims to solve the problems that an existing wave energy power generation device is poor in controllability, cannot adapt to complex sea conditions, is insufficient in wave energy utilization and the like, and provides a wave energy storage power generation system based on mechanical-hydraulic coupling transmission and a control method thereof. The invention can not only adapt to complex and changeable sea conditions, ensure the reliable work of the floater and capture wave energy to the maximum extent, but also realize the continuous, stable and controllable output of energy.
The technical scheme adopted by the invention for solving the technical problems is as follows: a wave energy storage power generation system based on mechanical-hydraulic coupling transmission comprises an energy capturing device, a mechanical transmission device and a hydraulic transmission device, wherein the energy capturing device is used for capturing wave energy, the mechanical transmission device is connected with the energy capturing device and used for converting the wave energy into mechanical energy, and the hydraulic transmission device is connected with the mechanical transmission device and used for converting the mechanical energy into hydraulic energy; the hydraulic transmission device is connected with the power generation system.
As a preferable mode of the present invention, the energy capturing device comprises a float and a float guiding mechanism, wherein the float guiding mechanism comprises a guiding sleeve and a guiding column for fixing the float; the guide posts are three groups, the guide posts are circumferentially and uniformly distributed around the floats, and the floats are fixed on the guide sleeve and move up and down along the guide posts.
Further preferably, a limiting device is arranged on the guide post and used for limiting the movement stroke of the floater.
In a preferred embodiment of the present invention, the mechanical transmission device includes a guide device and a transmission device; the guide device is connected with the support frame; the transmission device is fixed on the guide device and does mechanical motion under the guidance of the guide device.
Further preferably, the guiding device comprises a guiding frame, a roller and a guiding rail; the roller is fixed on the guide frame and rolls in the guide rail groove; the guide frame is connected with the support frame through a connecting block.
Further preferably, the upper part of the connecting block is fixedly connected with the guide frame, and the lower part of the connecting block is connected with the supporting frame pin shaft.
Further preferably, the transmission device is a chain transmission device, a rack transmission device or a belt transmission device.
In a preferred embodiment of the present invention, the hydraulic transmission device includes a speed increaser, a bidirectional hydraulic pump, an accumulator, and a hydraulic motor; the speed increaser is connected with an output shaft of the mechanical transmission device, the bidirectional hydraulic pump is connected with the speed increaser, and the energy accumulator is filled with oil by applying work through double strokes; the accumulator outputs high-pressure oil to drive the hydraulic motor.
Further preferably, the hydraulic oil circuit is provided with a check valve, and the check valve is used for controlling the trend of hydraulic oil, so that the hydraulic oil enters the hydraulic loop through different oil circuits when the bidirectional hydraulic pump rotates forwards and backwards.
More preferably, the number of the energy accumulators is more than two, and the more than two groups of the energy accumulators are connected in parallel in the hydraulic circuit; a normally-on electromagnetic valve is arranged in front of the energy accumulator, and a normally-off electromagnetic valve is arranged behind the energy accumulator; at least one group of energy accumulators is filled with oil when other energy accumulators are drained.
The invention discloses a wave energy storage power generation system based on mechanical-hydraulic coupling transmission, which has the beneficial effects that: by adopting a mechanical-hydraulic coupling transmission mode, the device not only can adapt to complex and variable sea conditions, ensure that the floater works reliably and simultaneously captures wave energy to the maximum extent, but also can realize continuous, stable and controllable output of energy. The hydraulic transmission system controls the multiple groups of energy accumulators to realize the cooperative and ordered work of the multiple groups of energy accumulators, so that the utilization rate of wave energy can be improved, and the waste of the wave energy is reduced.
Drawings
FIG. 1 is a schematic view of an energy capture device and mechanical transmission in an embodiment of the present invention;
FIG. 2 is a schematic view of a guide;
FIG. 3 is a schematic structural view of the guide frame;
FIG. 4 is a rear side view of the guide frame;
FIG. 5 is a chain sprocket installation schematic;
fig. 6 is a schematic diagram of a hydraulic transmission.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
One embodiment provided by the invention is as follows: a wave energy storage power generation system based on mechanical-hydraulic coupling transmission mainly comprises an energy capturing device, a mechanical transmission device and a hydraulic transmission device, wherein wave energy is captured by the energy capturing device and transmitted to the mechanical transmission device, the mechanical transmission device converts the wave energy into mechanical energy and then transmits the mechanical energy to the hydraulic transmission device, and the hydraulic transmission device converts the mechanical energy into stable hydraulic energy and outputs the hydraulic energy to a power generation device for power generation.
As shown in fig. 1, the energy capturing device comprises a float 13 and a float guiding mechanism, and the vertical oscillation of the float is used for capturing wave energy. In order to limit the float 13 to only do single-degree-of-freedom heave motion, three guide pipes 9 are uniformly distributed along the circumference of the float 13, the guide columns 12 penetrate through the guide pipes 9, the upper ends of the guide columns are connected with the main deck 8, and the lower ends of the guide columns are connected with the base 11, so that the float 13 can do up-and-down motion along the guide columns 12, the influence of waves on the overturning oscillation of the float 13 is eliminated, and the collection and conversion of wave energy are facilitated.
The upper part and the lower part of each guide post 12 are provided with a buffering limiting device 10 which can limit the maximum stroke position of the up-and-down movement of the floater 13, thereby ensuring the safe and reliable work of the system.
As shown in fig. 1, the mechanical transmission device is mainly composed of a support frame 14, a guide device, a chain transmission device, a tensioning device, and the like. The chain transmission device is positioned above the floater 13, so that the problem of stress concentration caused by the fact that holes are formed in the floater 13 is avoided, and the floater can capture wave energy to the maximum extent.
The function of the support bracket 14 is to transmit the movement of the float 13 to the chain drive. The bottom of the support frame 14 is fixedly arranged on the floater 13, a through hole is arranged on the main deck 8, and the upper part of the support frame 14 extends out of the through hole and is connected with the guide frame 15 through a connecting block 18.
As shown in fig. 2, the guide device formed by the guide frame 15, the roller 19 and the guide rail 5 mainly guides the support frame 14. The guide rail 5 is arranged between the control console 3 and the main deck 8, 4 rollers 19 are respectively arranged on two sides of the guide frame 15, and the rollers 19 are arranged in the grooves of the guide rail 5, so that the support frame 14 can move up and down along the direction of the guide rail 5.
As shown in fig. 3 and 4, the guide frame 15 is mainly composed of an outer roller mounting frame 15-1, an inner roller mounting frame 15-2, a chain mounting square tube 15-3, a connecting square tube 15-4, and a connecting rib plate 15-5. The rollers 19 are fixedly mounted to the outer roller mounting bracket 15-1 and the inner roller mounting bracket 15-2 by bolts and can roll along the guide rail 5. The outer roller mounting frame 15-1 and the inner roller mounting frame 15-2 are welded together through a connecting square pipe 15-4. The chain mounting square pipe 15-3 is welded on one side of the two inner side roller mounting frames 15-2 and can be fixedly mounted with the chain 16 through bolts. The connecting block 18 is connected to the inside roller mounting frame 15-2 by a connecting rib 15-5 welded to the inside roller mounting frame 15-2.
Ideally, the float 13 moves vertically relative to the main deck under the action of wave force, but because the installation gap exists between the float 13 and the guide column, the float 13 can sway left and right while moving up and down, and the meshing of the chain wheel and the chain can be influenced undoubtedly. In order to eliminate the influence of the gap on the chain 16, a horizontal through hole is formed in the connecting block 18, the supporting frame 14 is connected with the connecting block 18 through a pin shaft 17, the connecting block 18 can only move vertically relative to the guide frame 15 and the guide rail 5, and therefore when the floater 13 swings and inclines, the pin shaft 17 moves left and right or moves back and forth in the through hole of the connecting block 18, and therefore the influence of the gap on the chain is eliminated, and the structure is shown in fig. 2.
As shown in fig. 1 and 5, the chain drive includes a sprocket I1, a sprocket II 6, and a chain 16. The function of the chain wheel and the chain is to convert the linear motion of the support frame 14 into the rotary motion. Sprocket I1 is installed in control cabinet 3 through sprocket I support 2, and sprocket II 6 is installed in main deck 8 through sprocket II support 7, and sprocket I1 and sprocket II 6 are arranged perpendicularly, and chain 16 forms vertical drive between sprocket I1 and sprocket II 6, and the accessible adjustment sprocket I1 adapts to different sea states with the centre-to-centre spacing of sprocket II 6. The chain 16 is connected to the guide frame 15 by a link plate 21, and in order to accommodate errors generated during installation, a spacer plate 20 is installed between the guide frame 15 and the chain 16 to adjust a gap generated during installation. The chain wheel shaft 23 of the chain wheel II 6 is matched with the bearing seat 22, and the bearing seat 22 is arranged on the chain wheel II support 7.
The function of the tensioning device 4 is to ensure effective engagement of the chain. The tensioning device 4 is mounted on the rail beam and is tensioned by suspending a weight on one side and pressing the tensioning wheel on the other side against the chain 16 in a gravity tensioning fashion.
It should be noted that the chain transmission device in the present embodiment may be replaced by a rack gear or a belt transmission device, and the function and the effect achieved by the chain transmission device in the present embodiment are the same.
During operation, the floater 13 drives the support frame 14 to move up and down under the action of wave energy, the support frame 14 acts on the guide frame 15 through the connecting block 18 and drives the roller 19 to roll along the guide rail 5, so that the support frame 14 drives the chain 16 to do linear motion along the direction of the guide rail, and the chain 16 drives the chain wheel I1 and the chain wheel II 6 to rotate under the meshing action, thereby realizing the conversion from the wave energy to the mechanical energy.
Because the mechanical energy output by the mechanical transmission device is influenced by waves, the continuity and the stability of the mechanical energy are poor, so that the hydraulic system is adopted to convert the mechanical energy output by the mechanical transmission device into hydraulic energy to realize continuous and stable power generation.
As shown in fig. 6, the hydraulic transmission device mainly includes a speed increaser, a bidirectional hydraulic pump 24, an accumulator 27, and a hydraulic motor 32. The speed increaser is connected with an output shaft of a chain wheel I1 of the mechanical transmission device, the rotating speed output by the output shaft of the chain wheel I1 is increased by the speed increaser and then drives the bidirectional hydraulic pump 24 to work, and the bidirectional hydraulic pump 24 can rotate forward and backward, so that double-stroke work doing in the up-and-down movement process of the floater is realized. The hydraulic pump 24 draws oil from the oil tank 35 and pumps the oil into the accumulator 27, and high pressure oil is output from the accumulator 27. The accumulator 27 is controlled to complete the oil charging and discharging actions through the set control strategy, and then the hydraulic motor 32 is driven to drive the generator 33 to complete the electric energy output.
And 5 one-way valves are arranged on the hydraulic oil circuit and used for realizing the unidirectionality of the hydraulic oil circuit. When the bidirectional hydraulic pump 24 rotates anticlockwise, hydraulic oil in the oil tank 35 is sucked into the hydraulic pump through the fourth one-way valve 25-4, and the oil is discharged out of the bidirectional hydraulic pump 24 and enters a hydraulic loop through the first one-way valve 25-1; conversely, when the bidirectional hydraulic pump 24 rotates clockwise, the hydraulic oil in the oil tank 35 is sucked into the hydraulic pump through the third check valve 25-3, and the hydraulic oil is discharged from the bidirectional hydraulic pump 24, enters the hydraulic circuit through the second check valve 25-2, flows through the accumulator 27, the hydraulic motor 32 and the fifth check valve 25-5, and finally flows back to the oil tank 35.
The hydraulic energy storage can realize that the float can all export stable hydraulic energy under different ripples condition, in this embodiment, utilizes solenoid valve and pressure relay can carry out effective control to hydraulic system.
In the hydraulic circuit, a two-position two-way normally-open solenoid valve (hereinafter referred to as a normally-open valve) 26 is arranged in front of the accumulator 27, the oil inlet side is connected with the two-way hydraulic pump 24, and the normally-open end of the oil outlet side is connected with the accumulator 27. The electromagnetic valve at the back of the accumulator 27 is a two-position two-way normally-off electromagnetic valve (hereinafter referred to as a normally-off valve) 28, and the oil outlet side is connected with the hydraulic motor 32, namely, a passage is formed between the accumulator 27 and the hydraulic motor 32 after the normally-off valve 28 is electrified. The first pressure relay 30-1 and the second pressure relay 30-2 are respectively used for setting the initial pressure and the release pressure of the accumulator 27, controlling the working state of the electromagnetic valve and monitoring the pressure condition of the system in real time through the pressure gauge 29.
When working, the single-group energy accumulator can only realize one action of oil charging or oil discharging, but not both actions. In fact, when the accumulator is drained, the float does not stop oscillating, and the hydraulic oil discharged by the hydraulic pump flows back to the oil tank because the hydraulic oil cannot be filled into the accumulator, which causes waste of wave energy. Therefore, in order to ensure that the wave energy absorbed by the front end is still fully utilized when the accumulator releases hydraulic oil to drive the generator to work, the embodiment adopts a plurality of groups of accumulators, and controls the working modes of the accumulators through a certain control strategy to enable the accumulators to work cooperatively, so that the oil is discharged from one part of the accumulators, and simultaneously, the oil is filled into the other part of the accumulators.
In this embodiment, taking 3 groups of accumulators as an example, the specific control manner is as follows:
1/3 duty cycle: when the pressure of the pressure gauge 29 is smaller than the set value of the first pressure relay 30-1, the first normal-way valve 26-1, the second normal-way valve 26-2 and the normally-off valves (28-1, 28-2 and 28-3) are powered off, the third normal-way valve 26-3 is powered on, at the moment, the first energy accumulator 27-1 and the second energy accumulator 27-2 are in an oil filling state, and the third energy accumulator 27-3 does not work. When the pressure of the pressure gauge 29 reaches the set value of the second pressure relay 30-2 for the first time, the first constant-pressure valve 26-1, the second constant-pressure valve 26-2, the first constant-pressure valve 28-1 and the second constant-pressure valve 28-2 are powered on, and the third constant-pressure valve 26-3 and the third constant-pressure valve 28-3 are powered off. At this time, the first accumulator 27-1 and the second accumulator 27-2 are in a discharge state, and the third accumulator 27-3 is in a charge state. The hydraulic oil released by the first accumulator 27-1 and the second accumulator 27-2 flows into the hydraulic motor 32 after being subjected to speed regulation by the speed regulating valve 31, and the hydraulic motor 32 rotates to drive the generator 33 to work, so that the output of electric energy is realized.
2/3 duty cycle: when the pressure of the pressure gauge 29 is reduced to a set value of the first pressure relay 30-1, the first normally-open valve 26-1, the first normally-open valve 28-1 and the second normally-open valve 28-2 are switched to be powered off, the second normally-open valve 26-2 is kept powered on, the third normally-open valve 26-3 and the third normally-open valve 28-3 are kept powered off, at the moment, the first energy accumulator 27-1 and the third energy accumulator 27-3 are in an oil-filled state, and the second energy accumulator 27-2 does not work. When the pressure of the pressure gauge 29 rises to the set value of the second pressure relay 30-2 again, the first normally-open valve 26-1, the third normally-open valve 26-3, the first normally-closed valve 28-1 and the third normally-open valve 28-3 are powered on, the second normally-open valve 26-2 and the second normally-open valve 28-2 are powered off, at the moment, the first energy accumulator 27-1 and the third energy accumulator 27-3 are in an oil discharge state, and the second energy accumulator 27-2 is in an oil charge state.
3/3 duty cycle: when the pressure is reduced to the set value of the first pressure relay 30-1 again, the third normal-way valve 26-3, the first normally-off valve 28-1 and the third normally-off valve 28-3 are switched to be powered off, the first normal-way valve 26-1 is kept powered on, the second normal-way valve 26-2 and the second normally-off valve 28-2 are kept powered off, at the moment, the second energy accumulator 27-2 and the third energy accumulator 27-3 are in an oil-filled state, and the first energy accumulator 27-1 does not work. When the pressure of the pressure gauge 29 reaches the set value of the first pressure relay 30-1 for the third time, the second normally-open valve 26-2, the third normally-open valve 26-3, the second normally-open valve 28-2 and the third normally-open valve 28-3 are powered on, the first normally-open valve 26-1 and the first normally-open valve 28-1 are powered off, at the moment, the second energy accumulator 27-2 and the third energy accumulator 27-3 are in an oil discharge state, and the first energy accumulator 27-1 is in an oil charge state. When the pressure again drops to the first pressure relay 30-1 setpoint, the system reenters 1/3 the duty cycle and begins the next energy storage, power generation cycle, as shown in Table 1.
TABLE 1 working states of valves and accumulators at different stages in a cycle
Figure 950772DEST_PATH_IMAGE001
Note, oo: representing the electromagnetic valve is electrified; x: representing the power failure of the electromagnetic valve; -: representing the accumulator is not operating.
By adopting the control mode, one group of energy accumulators can be in an oil charging state during the oil discharging period of the two groups of energy accumulators, and meanwhile, the capacity of the energy accumulators is reasonably calculated, so that the other group of energy accumulators is not fully charged when the oil discharging of the two groups of energy accumulators is finished. Therefore, at least one group of energy accumulators in the system can be ensured to be filled with oil all the time, and the wave energy is fully utilized.
On the other hand, the electromagnetic valve and the pressure relay control the hydraulic system, so that the power generation process of the generator is only related to the initial value and the release value set by the energy accumulator and is not influenced by the wave conditions, and the purpose that the power generation system can stably generate power under different wave conditions can be achieved.

Claims (10)

1. A wave energy storage power generation system based on mechanical-hydraulic coupling transmission is characterized in that: the wave energy capturing device comprises an energy capturing device, a mechanical transmission device and a hydraulic transmission device, wherein the energy capturing device is used for capturing wave energy, the mechanical transmission device is connected with the energy capturing device and used for converting the wave energy into mechanical energy, and the hydraulic transmission device is connected with the mechanical transmission device and used for converting the mechanical energy into hydraulic energy; the hydraulic transmission device is connected with the power generation system.
2. A wave energy storage power generation system based on a mechano-hydraulic coupling transmission according to claim 1, characterized in that: the energy catching device comprises a floater, a support frame and a floater guide mechanism, wherein the support frame is fixed on the floater and moves up and down along with the floater; the float guide mechanism comprises a guide sleeve and a guide post which are used for fixing the float; the guide posts are three groups, the guide posts are circumferentially and uniformly distributed around the floats, and the floats are fixed on the guide sleeve and move up and down along the guide posts.
3. A wave energy storage power generation system based on a mechano-hydraulic coupling transmission according to claim 2, characterized in that: and the guide post is provided with a limiting device, and the limiting device is used for limiting the movement stroke of the floater.
4. A wave energy storage power generation system based on a mechano-hydraulic coupling transmission according to claim 3, characterized in that: the mechanical transmission device comprises a guide device and a transmission device; the guide device is connected with the support frame; the transmission device is fixed on the guide device and does mechanical motion under the guidance of the guide device.
5. A wave energy storage power generation system based on a mechanical-hydraulic coupling transmission according to claim 4, characterized in that: the guide device comprises a guide frame, a roller and a guide rail; the roller is fixed on the guide frame and rolls in the guide rail groove; the guide frame is connected with the support frame through a connecting block.
6. A wave energy storage power generation system based on a mechanical-hydraulic coupling transmission according to claim 5, characterized in that: the upper part of the connecting block is fixedly connected with the guide frame, and the lower part of the connecting block is connected with the supporting frame pin shaft.
7. A wave energy storage power generation system based on a mechanical-hydraulic coupling transmission according to claim 4, 5 or 6, characterized in that: the transmission device is a chain transmission device, a rack transmission device or a belt transmission device.
8. A wave energy storage power generation system based on a mechano-hydraulic coupling transmission according to claim 1, characterized in that: the hydraulic transmission system comprises a speed increaser, a bidirectional hydraulic pump, an energy accumulator and a hydraulic motor; the speed increaser is connected with the mechanical transmission device, the bidirectional hydraulic pump is connected with the speed increaser, and the oil is injected into the energy accumulator by applying work through double strokes; the accumulator outputs high-pressure oil to drive the hydraulic motor.
9. A wave energy storage power generation system based on a mechano-hydraulic coupling transmission according to claim 8, characterized in that: the hydraulic oil circuit is provided with a one-way valve which is used for controlling the trend of hydraulic oil, so that the hydraulic oil enters the hydraulic loop through different oil circuits when the two-way hydraulic pump rotates forwards and backwards.
10. A wave energy storage power generation system based on a mechanical-hydraulic coupling transmission according to claim 8 or 9, characterized in that: the number of the energy accumulators is more than two, and the energy accumulators are connected in parallel in the hydraulic circuit; a normally-on electromagnetic valve is arranged in front of the energy accumulator, and a normally-off electromagnetic valve is arranged behind the energy accumulator; at least one group of energy accumulators is filled with oil when other energy accumulators are drained.
CN202010579687.4A 2020-06-23 2020-06-23 Wave energy storage power generation system based on mechanical-hydraulic coupling transmission Pending CN111692038A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115818395A (en) * 2022-07-11 2023-03-21 广州大学 Practice thrift domestic small-size elevator in space

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115818395A (en) * 2022-07-11 2023-03-21 广州大学 Practice thrift domestic small-size elevator in space

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