CN114198244A - Multi-freedom-degree energy harvesting float-type wave energy power generation device - Google Patents
Multi-freedom-degree energy harvesting float-type wave energy power generation device Download PDFInfo
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- CN114198244A CN114198244A CN202111506906.7A CN202111506906A CN114198244A CN 114198244 A CN114198244 A CN 114198244A CN 202111506906 A CN202111506906 A CN 202111506906A CN 114198244 A CN114198244 A CN 114198244A
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- 238000010248 power generation Methods 0.000 title claims abstract description 24
- 238000003306 harvesting Methods 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 230000009347 mechanical transmission Effects 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 35
- 230000008859 change Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 8
- 238000004146 energy storage Methods 0.000 claims description 6
- 239000013535 sea water Substances 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 33
- 230000005611 electricity Effects 0.000 description 8
- 238000007667 floating Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 241000272517 Anseriformes Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- F03B13/1805—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 is hinged to the rem
- F03B13/181—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 is hinged to the rem for limited rotation
- F03B13/1815—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 is hinged to the rem for limited rotation with an up-and-down movement
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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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
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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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
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- 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
- Y02E10/20—Hydro energy
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- 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
Abstract
The invention relates to a float-type wave energy power generation device capable of harvesting energy with multiple degrees of freedom, which comprises a wave energy capturing module, a mechanical transmission module, an electric energy conversion module and a supporting platform, wherein the wave energy capturing module comprises a float, and the electric energy conversion module comprises a main generator, a first auxiliary generator and a second auxiliary generator; the mechanical transmission module comprises a push rod, a lead screw transmission device, a mechanical rectification gear box, a rolling frame and a pitching frame which are sequentially arranged from bottom to top; linear motion of the floater is converted into rotary motion of the screw through the screw transmission device, reciprocating rotary motion of the screw is converted into unidirectional rotary motion through the mechanical rectifier gearbox, and mechanical energy is converted into electric energy; two degrees of freedom of rolling and pitching are released through a rolling rotating shaft and a pitching rotating shaft, and two auxiliary generators are arranged at the same time to capture wave energy in different directions. The multi-freedom-degree energy harvesting device can realize multi-freedom-degree energy harvesting, improve the wave energy conversion efficiency, reduce the impact of waves on a guide system and improve the reliability of the device.
Description
Technical Field
The invention relates to the technical field of ocean wave energy power generation, in particular to a float type wave energy power generation device which is carried on an offshore platform and can capture energy with multiple degrees of freedom.
Background
249.7TWh wave energy resources can be utilized annually offshore in China. There are numerous islands in China, and sufficient power supply is essential in the process of island development and utilization. Because most islands are far away from the continent, the cost of transmitting power remotely through cables is too high, and if wave energy resources around the islands can be utilized to generate power, the development cost of the islands can be greatly reduced.
At present, the wave energy power generation devices mainly comprise floats, nodding ducks, oscillating water columns, rafts, pendulums and the like, and a plurality of countries correspondingly build some demonstration devices and put into use. The existing float type generating set mainly utilizes single-degree-of-freedom motion to generate electricity, and has a plurality of problems of self stability and structural reliability under extreme sea conditions. In practical engineering application, most devices use a hydraulic system for energy transmission, and the transmission efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional float type wave energy power generation device can only convert the single-degree-of-freedom motion of a float into electric energy and is easily damaged by lateral impact, and provides a float type wave energy power generation device for harvesting energy with multiple degrees of freedom.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a float-type wave energy power generation device capable of harvesting energy with multiple degrees of freedom comprises a wave energy capturing module, a mechanical transmission module, an electric energy conversion module and a supporting platform, wherein the wave energy capturing module comprises a float, and the electric energy conversion module comprises a main generator, a first auxiliary generator and a second auxiliary generator;
the mechanical transmission module comprises a push rod, a lead screw transmission device and a mechanical rectifier gearbox which are sequentially arranged from bottom to top; the screw rod transmission device comprises a lower sealing sleeve, a screw rod and a screw rod nut, wherein the screw rod and the screw rod nut are arranged in the lower sealing sleeve; the lower end of the push rod is fixedly connected with the floater, and the upper end of the push rod extends into the lower sealing sleeve and is fixedly connected with the screw nut; the upper end of the screw rod is connected with an input shaft of the mechanical rectifier gearbox, and an output shaft of the mechanical rectifier gearbox is connected with an input shaft of a main generator of the electric energy conversion module; the mechanical rectifier gearbox and the main generator are integrally arranged in the upper sealing sleeve; the mechanical transmission module further comprises a rolling frame and a pitching frame which are arranged above the mechanical rectifying gear box, the rolling frame is positioned on the lower portion or the upper portion of the pitching frame, and when the rolling frame is positioned on the lower portion of the pitching frame: the upper end of the upper sealing sleeve is connected with the rolling frame through a rolling rotating shaft, the rolling rotating shaft and a lower device of the rolling rotating shaft can integrally rotate relative to the rolling frame, the end part of the rolling rotating shaft is connected with a first auxiliary generator input shaft of the electric energy conversion module, the upper end of the rolling frame is connected with the pitching frame through a pitching rotating shaft, the pitching rotating shaft and a lower device of the pitching rotating shaft can integrally rotate relative to the pitching frame, the end part of the pitching rotating shaft is connected with a second auxiliary generator input shaft of the electric energy conversion module, and the pitching frame is fixedly arranged on the supporting platform; when the roll frame is located at the upper portion of the pitch frame: the upper end of the upper sealing sleeve is connected with the pitching frame through a pitching rotating shaft, the pitching rotating shaft and a lower device of the upper sealing sleeve can integrally rotate relative to the pitching frame, the end part of the pitching rotating shaft is connected with a first auxiliary generator input shaft of the electric energy conversion module, the upper end of the pitching frame is connected with the rolling frame through a rolling rotating shaft, the rolling rotating shaft and the lower device of the rolling rotating shaft can integrally rotate relative to the rolling frame, the end part of the rolling rotating shaft is connected with a second auxiliary generator input shaft of the electric energy conversion module, and the rolling frame is fixedly arranged on the supporting platform; the rolling rotating shaft and the pitching rotating shaft are vertically arranged in a horizontal plane.
In the above scheme, the mechanical transmission module further comprises a rotation limiting device, and the rotation limiting device comprises a float bracket, a slider frame and a vertical guide rod; the vertical guide rod is fixedly arranged on the periphery of the lower sealing sleeve; the sliding block frame is arranged on the vertical guide rod and can slide up and down along the vertical guide rod; the float support comprises a horizontal support and a connecting rod, the horizontal support is fixedly connected with the float, the lower end of the connecting rod is fixedly connected with the horizontal support, and the upper end of the connecting rod is fixedly connected with the slider frame.
In the scheme, a second linear bearing is arranged at the joint of the inner side of the sliding block frame and the vertical guide rod, and the vertical guide rod and the second linear bearing are coaxially arranged.
In the scheme, the springs with adjustable rigidity or the dampers with adjustable damping are connected between the rolling frame and the rolling rotating shaft and between the pitching frame and the pitching rotating shaft, and when the swing angle of the floating body is too large to influence the overall energy recovery efficiency, the adjustment of the posture of the floating body is realized by controlling the rigidity of the springs or the damping of the dampers.
In the scheme, the lower sealing sleeve comprises a lead screw cavity shell, a lead screw cavity upper end face flange and a lead screw cavity lower end face flange, wherein the upper end and the lower end of the lead screw cavity shell are respectively connected with the lead screw cavity upper end face flange and the lead screw cavity lower end face flange; the upper sealing sleeve comprises a gearbox shell and a gear box upper end face flange, the lower end of the gearbox shell is connected with the screw rod cavity upper end face flange, and the upper end of the gearbox shell is connected with the gear box upper end face flange; when the rolling frame is positioned at the lower part of the pitching frame, the flange on the upper end surface of the gear box is connected with the rolling frame through the rolling rotating shaft; when the rolling frame is positioned at the upper part of the pitching frame, the flange on the upper end surface of the gear box is connected with the pitching frame through the pitching rotating shaft.
In the scheme, the push rod is a hollow rod with a hollow inner part, the lower end of the lead screw is matched with the inner wall of the push rod through a ball cage bearing, and the upper end of the lead screw is connected with the input shaft of the mechanical rectifying gear box through a first coupler; the screw rod is connected with the flange on the upper end surface of the screw rod cavity through a bidirectional thrust bearing.
In the scheme, a first linear bearing is sleeved on the outer wall of the push rod and is arranged in the center of a flange on the lower end face of the lead screw cavity; a sliding dynamic seal is arranged inside a flange on the lower end face of the screw cavity, so that seawater is prevented from entering the inside of the screw cavity shell.
In the scheme, the upper end of the push rod is coaxially connected with the nut sleeve through the expansion sleeve, the nut sleeve is coaxially connected with the lead screw nut through the bolt, and the lead screw nut is positioned on the inner side of the nut sleeve.
In the above scheme, the main generator, the first auxiliary generator and the second auxiliary generator are all provided with a speed change gear box, and the output end of the speed change gear box is connected with the input end of the generator.
In the above scheme, the electric energy conversion module further includes a charging system and an energy storage system, and the charging system and the energy storage system are respectively arranged in the supporting platform and used for managing and storing the energy collected by the three generators.
The invention has the beneficial effects that:
1. according to the device, linear motion of the floater is converted into rotary motion of the lead screw through the ball screw transmission device, reciprocating rotary motion of the lead screw is converted into unidirectional rotary motion through the mechanical rectifier gearbox, an output shaft of the mechanical rectifier gearbox is connected with an input shaft of a main generator of the electric energy conversion module, mechanical energy is converted into electric energy, and wave energy in the heaving direction is captured. In order to reduce the service life of the lateral impact extension device and simultaneously utilize wave energy to the maximum, the device is further provided with a multi-freedom-degree conversion module for releasing two degrees of freedom of rolling and pitching, two auxiliary generators are arranged at the same time for capturing wave energy in different directions, a second auxiliary generator arranged at the pitching rotating shaft is used for capturing the energy of the two degrees of freedom of floating pitching and pitching, and a first auxiliary generator arranged at the rolling rotating shaft is used for capturing the energy of the two degrees of freedom of floating rolling and pitching. Therefore, the device can realize multi-degree-of-freedom energy harvesting, improve the conversion efficiency of wave energy, reduce the impact of waves on a guide system and improve the reliability of the device.
2. According to the invention, the springs with adjustable rigidity or the dampers with adjustable damping are connected between the rolling frame and the rolling rotating shaft and between the pitching frame and the pitching rotating shaft, when the rolling and pitching tilt angles of the floating body are too large to influence the energy collection in the heave direction, the tilt angle is reduced by adjusting the constrained damping on the two degrees of freedom of rolling and pitching, and the wave energy conversion efficiency of the device is improved.
3. The device is provided with a rotation limiting device for limiting the rotary motion of the floater around the axis of the floater, so that the axial movement of the floater relative to the lower sealing sleeve is ensured; and simultaneously, the linear motion of the floater is guided.
4. The lower sealing sleeve and the upper sealing sleeve form a sealing cavity together, so that components such as a lead screw, a mechanical rectifier gear box, a main generator and the like in the sealing cavity are protected, and the service life of the device is prolonged.
5. The device can efficiently utilize wave energy to generate power, and can be applied to a plurality of scenes such as remote island power supply, ocean platform power supply, offshore monitoring equipment power supply and the like.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the overall structure of a float-type wave energy power generation device with multi-degree of freedom energy harvesting;
FIG. 2 is a schematic perspective view of the power generation apparatus shown in FIG. 1 with the lower sleeve and the upper sleeve removed;
FIG. 3 is a front view of the power generation device shown in FIG. 2;
FIG. 4 is an exploded top view of the power plant of FIG. 1;
fig. 5 is a schematic view showing the connection of the lower end of the screw of the power generation apparatus shown in fig. 1.
In the figure: 10. a float;
20. a push rod; 21. a first linear bearing; 22. a connecting seat;
30. a lead screw drive; 31. a lead screw cavity housing; 32. a flange is arranged on the upper end face of the screw cavity; 33. a flange on the lower end face of the screw cavity; 34. a lead screw; 35. a lead screw nut; 351. a nut sleeve; 352. expanding and tightening the sleeve; 36. a ball cage bearing; 37. a thrust bearing;
40. a mechanical rectifier gearbox; 41. a gearbox housing; 42. a flange on the upper end face of the gear box; 43. a gearbox housing; 44. a first coupling; 45. a second coupling;
51. a float support; 511. a horizontal support; 512. a connecting rod; 52. a slider frame; 521. a second linear bearing; 53. a vertical guide bar; 531. a guide rod seat;
61. a main generator; 611. a main generator base; 62. a first secondary generator; 621. a change speed gear box; 63. a second secondary generator;
70. a roll frame; 71. rolling the rotating shaft; 72. a rolling rotating shaft seat;
80. a pitching frame; 81. the rotating shaft is vertically shaken.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the multiple-degree-of-freedom float-type wave energy power generation device for harvesting energy provided by the embodiment of the invention comprises a wave energy capturing module, a mechanical transmission module, an electric energy conversion module and a support platform.
The wave energy capturing module comprises a floater 10, and the floater 10 has multi-degree-of-freedom wave energy capturing capacity.
The electric energy conversion module includes a main generator 61, a first sub-generator 62, and a second sub-generator 63, which respectively convert mechanical inputs in three directions into electric energy.
The mechanical transmission module comprises a push rod 20, a lead screw transmission device 30, a mechanical rectification gear box 40, a rolling rotating shaft 71, a rolling frame 70, a pitching rotating shaft 81 and a pitching frame 80 which are sequentially arranged from bottom to top. The lead screw transmission device 30 includes a lower sealing sleeve, and a lead screw 34 and a lead screw nut 35 which are arranged inside the lower sealing sleeve, and the lead screw nut 35 is sleeved on the lead screw 34. The lower end of the push rod 20 is fixedly connected with the floater 10, the upper end of the push rod 20 extends into the lower sealing sleeve and is fixedly connected with the screw nut 35, wave force acting on the floater 10 is transmitted to the screw nut 35 through the push rod 20 to drive the screw nut 35 to move up and down, and further drive the screw 34 to rotate relative to the screw nut 35, and in the process, the linear motion of the floater 10 is converted into the rotating motion of the screw 34. The lower sealing sleeve can effectively protect the lead screw 34 and related components, and the service life of the device is prolonged. The upper end of the screw 34 is connected with the input shaft of the mechanical rectification gear box 40 through a first coupler 44, and the reciprocating rotation motion of the screw 34 is converted into unidirectional rotation motion through the mechanical rectification gear box 40; the output shaft of the mechanical rectifier gearbox 40 is connected to the input shaft of the main generator 61 of the electrical energy conversion module via a second coupling 45 to convert mechanical energy into electrical energy. The mechanical rectification gearbox 40 and the main generator 61 are integrally arranged inside an upper sealing sleeve, and the upper sealing sleeve can effectively protect the mechanical rectification gearbox 40 and the main generator 61. The upper end of the upper sealing sleeve is connected with a rolling frame 70 through a rolling rotating shaft 71, the rolling rotating shaft 71 and a lower device thereof can integrally rotate relative to the rolling frame 70, and the end part of the rolling rotating shaft 71 is connected with an input shaft of a first secondary generator 62 of the electric energy conversion module; the upper end of the rolling frame 70 is connected with the pitching frame 80 through a pitching rotating shaft 81, the pitching rotating shaft 81 and the lower device thereof can integrally rotate relative to the pitching frame 80, and the end part of the pitching rotating shaft 81 is connected with the input shaft of the second auxiliary generator 63 of the electric energy conversion module; the rolling rotating shaft 71 and the pitching rotating shaft 81 are vertically arranged in a horizontal plane; the pitch frame 80 is fixedly mounted to the support platform by a top anchor bracket. When the floater 10 is subjected to horizontal wave force, the wave energy capturing module and the mechanical transmission module of the device are subjected to certain lateral impact, so that structural damage is caused. In order to reduce the service life of the lateral impact extension device and simultaneously utilize wave energy to the maximum, the device is provided with a multi-freedom-degree conversion module to release two degrees of freedom of rolling and pitching, and two auxiliary generators are arranged to capture the wave energy in different directions. The second auxiliary generator 63 arranged at the pitching rotating shaft 81 is used for capturing the energy of the two degrees of freedom of the floater 10 in pitching and pitching, and the first auxiliary generator 62 arranged at the rolling rotating shaft 71 is used for capturing the energy of the two degrees of freedom of the floater 10 in rolling and pitching, namely the energy of the three degrees of freedom of the floater 10 in pitching, heaving and pitching when the floater encounters wave-following and wave-facing sea conditions; when encountering the wave conditions, the energy of three degrees of freedom of the floater 10, namely the swaying, the heaving and the rolling can be captured; while encountering oblique waves may capture energy in five degrees of freedom of the float 10 in surging, swaying, heaving, rolling and pitching. Therefore, the invention can improve the conversion efficiency of wave energy, reduce the impact of waves on the guide system and improve the reliability of the device.
Further preferably, the mechanical transmission module further comprises a rotation limiting device, and the rotation limiting device comprises a float bracket 51, a slider frame 52 and a vertical guide rod 53. The vertical guide rod 53 is fixedly installed at the outer circumference of the lower sealing sleeve. The slider frame 52 is mounted on the vertical guide rod 53 and can slide up and down along the vertical guide rod 53, specifically, a second linear bearing 521 is arranged at the joint of the inner side of the slider frame 52 and the vertical guide rod 53, and the vertical guide rod 53 and the second linear bearing 521 are coaxially mounted. The floater bracket 51 comprises a horizontal bracket 511 and a connecting rod 512, the horizontal bracket 511 is fixedly connected with the floater 10, specifically, the horizontal bracket 511 is connected with the floater 10 through a threaded rod and a nut, the threaded rod sequentially penetrates through the horizontal bracket 511 and the floater 10, and two ends of the threaded rod are fastened through the nut. The lower end of the connecting rod 512 is fixedly connected with the horizontal bracket 511, and the upper end of the connecting rod 512 is fixedly connected with the sliding block frame 52. The lower end of the push rod 20 is fixedly connected with the horizontal bracket 511 through a connecting seat 22, the bottom surface of the connecting seat 22 is coaxially connected with the horizontal bracket 511, and the connecting seat 22 is coaxially and fixedly connected with the push rod 20 through a locking bolt. The rotary motion of the floater 10 around the axis of the floater is limited by a rotary limiting device, so that the axial movement of the floater 10 relative to the lower sealing sleeve is ensured; while guiding the linear movement of the float 10.
Further optimization, springs with adjustable rigidity or dampers with adjustable damping are connected between the rolling frame 70 and the rolling rotating shaft 71 and between the pitching frame 80 and the pitching rotating shaft 81, when the energy collection in the heave direction is influenced by overlarge rolling angle of the floating body, the rolling angle is reduced by adjusting the constrained damping on two degrees of freedom of rolling and pitching, and the wave energy conversion efficiency of the device is improved.
Further optimize, lower seal sleeve includes lead screw chamber casing 31, lead screw chamber up end flange 32 and lead screw chamber lower extreme face flange 33, and the upper and lower both ends of lead screw chamber casing 31 are connected with lead screw chamber up end flange 32 and lead screw chamber lower extreme face flange 33 respectively. The upper sealing sleeve comprises a gear box shell 41 and a gear box upper end face flange 42, the lower end of the gear box shell 41 is connected with the lead screw cavity upper end face flange 32, and the upper end of the gear box shell 41 is connected with the gear box upper end face flange 42. The gear box upper end flange 42 is connected with the roll frame 70 through a roll rotating shaft 71.
Preferably, the push rod 20 is a hollow rod with a hollow inside, the lower end of the lead screw 34 is matched with the inner wall of the push rod 20 through the ball cage bearing 36, and the optical axis part at the upper end of the lead screw 34 is connected with the input shaft of the mechanical rectifying gear box 40 through the first coupler 44. The lead screw 34 is connected with the flange 32 of the upper end face of the lead screw cavity through a two-way thrust bearing 37, specifically, the lead screw 34 is connected with the two-way thrust bearing 37 through a nut matched with threads, the lead screw 34 can rotate around an axis, and the two-way thrust bearing 37 is coaxially connected with the flange 32 of the upper end face of the lead screw cavity through a bolt.
Further optimize, the outer wall of the push rod 20 is sleeved with a first linear bearing 21, the first linear bearing 21 is arranged at the central position of the lower end face flange 33 of the screw cavity, and is fixed at the lower part of the lower end face flange 33 of the screw cavity through a bolt. A sliding dynamic seal is arranged inside the lower end face flange 33 of the screw cavity to prevent seawater from entering the inside of the screw cavity housing 31.
Further preferably, the vertical guide rod 53 is arranged on the periphery of the screw cavity shell 31, and the upper end and the lower end of the vertical guide rod 53 are respectively fixedly connected with the screw cavity upper end face flange 32 and the screw cavity lower end face flange 33 through the guide rod seat 531.
Further optimizing, the mechanical rectification gear box 40 is connected with the flange 32 on the upper end face of the screw cavity through a gear box support 43, and the lower part of the gear box support 43 is fixedly connected with the flange 32 on the upper end face of the screw cavity through bolts and symmetrically arranged along the axis of the flange. The upper part of the gear box bracket 43 is fixedly connected with the lower part of the main generator base 611 through bolts, and the main generator 61 is arranged on the main generator base 611.
Further preferably, the upper end of the push rod 20 is coaxially connected with the nut sleeve 351 through the expansion sleeve 352, the nut sleeve 351 is coaxially connected with the lead screw nut 35 through a bolt, and the lead screw nut 35 is located on the inner side of the nut sleeve 351.
Preferably, the main generator 61, the first auxiliary generator 62 and the second auxiliary generator 63 are all provided with a speed change gear box, and the output end of the speed change gear box is connected with the input end of the corresponding generator. Only the variable speed gearbox 621 corresponding to the first secondary generator 62 is shown.
Further optimizing, the middle part of the rolling rotating shaft 71 is fixedly arranged on the rolling rotating shaft seat 72, the lower end face of the rolling rotating shaft seat 72 is fixedly connected with the flange 42 on the upper end face of the gear box, and two ends of the rolling rotating shaft 71 are rotatably connected with the rolling frame 70 through bearings and bearing seats. The middle part of the pitching rotating shaft 81 is fixedly arranged on the pitching rotating shaft 81 seat, the lower end face of the pitching rotating shaft 81 seat is fixedly connected with the rolling frame 70, and the two ends of the pitching rotating shaft 81 are rotatably connected with the pitching frame 80 through bearings and bearing seats.
Further optimizing, the electric energy conversion module further comprises a charging system and an energy storage system, wherein the charging system and the energy storage system are respectively arranged in the supporting platform and used for managing and storing the energy collected by the three generators.
In the present embodiment, the roll frame 70 is disposed below the pitch frame 80; in other embodiments, the positions of the roll frame 70 and the pitch frame 80 can be changed, and the connection method is similar and will not be described herein.
The invention relates to a working principle of a floater 10 type wave energy power generation device with multi-degree of freedom for energy harvesting, which comprises the following steps:
when the device of the invention is operated in waves, the pitching frame 80 is fixed to the support platform, the entire device is suspended above the water surface, and the float 10 floats in the water. Under the action of the waves, the float 10 undergoes surge, sway, heave, roll and pitch motions. When a wave comes, the float 10 pushes the push rod 20 to move upwards, the push rod 20 drives the lead screw nut 35 to do linear motion, the float 10 cannot rotate around the axial direction due to the limitation of the slider frame 52, the lead screw 34 does rotary motion relative to the lead screw nut 35, and the upward linear motion of the float 10 is converted into the rotary motion of the lead screw 34 in the process. The upper end of the screw rod 34 is connected with an input shaft at the lower part of the mechanical rectifying gear box 40, and an output shaft at the upper part of the mechanical rectifying gear box 40 is connected with a main generator 61 to drive the main generator 61 to generate electricity. When the wave trough comes, the float 10 drives the push rod 20 to move downwards, at this time, the rotation direction of the lead screw 34 is opposite to that before, the rotation direction of the input shaft of the mechanical rectification gear box 40 connected with the lead screw is changed at the same time, the rotation direction of the output shaft of the mechanical rectification gear box 40 is kept unchanged after being adjusted by the mechanical rectification gear box 40, and then the main generator 61 is driven to generate electricity. Therefore, the floater 10 can realize power output to drive the main generator 61 to generate electricity during the ascending and descending processes.
The float 10 will not only produce heave motion under the action of waves, but will also be subjected to lateral forces to produce roll and pitch motion about the hinge axis. The heave conversion mechanism of the device is matched with the multi-degree-of-freedom module, so that the lateral impact of waves on the device is reduced, and the service life of the device is prolonged. When the device undergoes a rolling motion about the hinge axis, the rolling shaft 71 drives the first sub-generator 62 to generate electricity via the change gear box 621. When the device undergoes a pitching motion about the hinge axis, the pitching rotation shaft 81 drives the second sub-generator 63 through the change speed gear box to generate electricity. When the device is subjected to overlarge lateral force, the energy collection in the heave direction can be influenced by the rolling and pitching motions of the device.
In conclusion, the invention can convert the motions of the floater 10 with a plurality of degrees of freedom, such as surging, swaying, heaving, pitching and rolling, under the action of waves into rotary motions to drive the generator to generate electricity. The invention can utilize the motion of a plurality of degrees of freedom of the floater 10 under the action of waves to generate electricity, thereby improving the conversion efficiency of wave energy, reducing the lateral impact of the waves on the guide system and increasing the reliability of the device. The invention can be applied to a plurality of scenes such as remote island power supply, ocean platform power supply, offshore monitoring equipment power supply and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A float-type wave energy generating device with multi-degree-of-freedom energy harvesting comprises a wave energy capturing module, a mechanical transmission module, an electric energy conversion module and a supporting platform, wherein the wave energy capturing module comprises a float,
the electric energy conversion module comprises a main generator, a first auxiliary generator and a second auxiliary generator;
the mechanical transmission module comprises a push rod, a lead screw transmission device and a mechanical rectifier gearbox which are sequentially arranged from bottom to top; the screw rod transmission device comprises a lower sealing sleeve, a screw rod and a screw rod nut, wherein the screw rod and the screw rod nut are arranged in the lower sealing sleeve; the lower end of the push rod is fixedly connected with the floater, and the upper end of the push rod extends into the lower sealing sleeve and is fixedly connected with the screw nut; the upper end of the screw rod is connected with an input shaft of the mechanical rectifier gearbox, and an output shaft of the mechanical rectifier gearbox is connected with an input shaft of a main generator of the electric energy conversion module; the mechanical rectifier gearbox and the main generator are integrally arranged in the upper sealing sleeve; the mechanical transmission module further comprises a rolling frame and a pitching frame which are arranged above the mechanical rectifying gear box, the rolling frame is positioned on the lower portion or the upper portion of the pitching frame, and when the rolling frame is positioned on the lower portion of the pitching frame: the upper end of the upper sealing sleeve is connected with the rolling frame through a rolling rotating shaft, the rolling rotating shaft and a lower device of the rolling rotating shaft can integrally rotate relative to the rolling frame, the end part of the rolling rotating shaft is connected with a first auxiliary generator input shaft of the electric energy conversion module, the upper end of the rolling frame is connected with the pitching frame through a pitching rotating shaft, the pitching rotating shaft and a lower device of the pitching rotating shaft can integrally rotate relative to the pitching frame, the end part of the pitching rotating shaft is connected with a second auxiliary generator input shaft of the electric energy conversion module, and the pitching frame is fixedly arranged on the supporting platform; when the roll frame is located at the upper portion of the pitch frame: the upper end of the upper sealing sleeve is connected with the pitching frame through a pitching rotating shaft, the pitching rotating shaft and a lower device of the upper sealing sleeve can integrally rotate relative to the pitching frame, the end part of the pitching rotating shaft is connected with a first auxiliary generator input shaft of the electric energy conversion module, the upper end of the pitching frame is connected with the rolling frame through a rolling rotating shaft, the rolling rotating shaft and the lower device of the rolling rotating shaft can integrally rotate relative to the rolling frame, the end part of the rolling rotating shaft is connected with a second auxiliary generator input shaft of the electric energy conversion module, and the rolling frame is fixedly arranged on the supporting platform; the rolling rotating shaft and the pitching rotating shaft are vertically arranged in a horizontal plane.
2. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device of claim 1, wherein the mechanical transmission module further comprises a rotation limiting device, and the rotation limiting device comprises a float bracket, a slider frame and a vertical guide rod; the vertical guide rod is fixedly arranged on the periphery of the lower sealing sleeve; the sliding block frame is arranged on the vertical guide rod and can slide up and down along the vertical guide rod; the float support comprises a horizontal support and a connecting rod, the horizontal support is fixedly connected with the float, the lower end of the connecting rod is fixedly connected with the horizontal support, and the upper end of the connecting rod is fixedly connected with the slider frame.
3. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 2, wherein a second linear bearing is arranged at the joint of the inner side of the slider frame and the vertical guide rod, and the vertical guide rod and the second linear bearing are coaxially mounted.
4. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 1, wherein springs or dampers with adjustable rigidity or adjustable damping are connected between the rolling frame and the rolling rotating shaft and between the pitching frame and the pitching rotating shaft, and when the swing angle of the float is too large to affect the overall energy recovery efficiency, the adjustment of the float posture is achieved by controlling the spring rigidity or the damper damping.
5. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 1, wherein the lower sealing sleeve comprises a lead screw cavity shell, a lead screw cavity upper end face flange and a lead screw cavity lower end face flange, and the upper end and the lower end of the lead screw cavity shell are respectively connected with the lead screw cavity upper end face flange and the lead screw cavity lower end face flange; the upper sealing sleeve comprises a gearbox shell and a gear box upper end face flange, the lower end of the gearbox shell is connected with the screw rod cavity upper end face flange, and the upper end of the gearbox shell is connected with the gear box upper end face flange; when the rolling frame is positioned at the lower part of the pitching frame, the flange on the upper end surface of the gear box is connected with the rolling frame through the rolling rotating shaft; when the rolling frame is positioned at the upper part of the pitching frame, the flange on the upper end surface of the gear box is connected with the pitching frame through the pitching rotating shaft.
6. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 5, wherein the push rod is a hollow rod with a hollow interior, the lower end of the lead screw is matched with the inner wall of the push rod through a ball cage bearing, and the upper end of the lead screw is connected with the input shaft of the mechanical rectifying gear box through a first coupler; the screw rod is connected with the flange on the upper end surface of the screw rod cavity through a bidirectional thrust bearing.
7. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 5, wherein a first linear bearing is sleeved on the outer wall of the push rod and arranged in the center of a flange on the lower end face of the lead screw cavity; a sliding dynamic seal is arranged inside a flange on the lower end face of the screw cavity, so that seawater is prevented from entering the inside of the screw cavity shell.
8. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device of claim 1, wherein the upper end of the push rod is coaxially connected with a nut sleeve through an expansion sleeve, the nut sleeve is coaxially connected with the lead screw nut through a bolt, and the lead screw nut is located on the inner side of the nut sleeve.
9. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device according to claim 1, wherein the main generator, the first auxiliary generator and the second auxiliary generator are all provided with a speed change gear box, and the output end of the speed change gear box is connected with the input end of the generator.
10. The multi-degree-of-freedom energy harvesting float-type wave energy power generation device of claim 1, wherein the electric energy conversion module further comprises a charging system and an energy storage system, the charging system and the energy storage system are respectively arranged in the support platform and used for managing and storing energy collected by the three generators.
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