CN112901407B

CN112901407B - Three-degree-of-freedom pendulum wave energy harvesting device based on six-rod mechanism

Info

Publication number: CN112901407B
Application number: CN202110075839.1A
Authority: CN
Inventors: 田昊; 周博洋; 张增猛; 陈圣涛; 弓永军
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2023-01-17
Anticipated expiration: 2041-01-20
Also published as: CN112901407A

Abstract

The invention provides a three-degree-of-freedom pendulum type wave energy harvesting device based on a six-rod mechanism, and relates to the field of new energy. The invention adopts a six-rod structure, drives the double hydraulic cylinders which are arranged in a non-parallel way to carry out wave energy capture by the six-rod structure, realizes special absorption of main components of kinetic energy contained in incident waves, and greatly improves the wave energy capture benefit.

Description

Three-degree-of-freedom pendulum wave energy harvesting device based on six-rod mechanism

Technical Field

The invention relates to the field of new energy, in particular to a three-degree-of-freedom pendulum type wave energy harvesting device based on a six-rod mechanism.

Background

Wave energy is one of several kinds of new energy which can be repeatedly acquired at present, has important strategic value, and the research, development and utilization of the wave energy have important significance for the energy safety of China. The wave energy power generation device mainly comprises an energy capture system and an energy conversion system. The main forms of energy capture systems are: oscillating water columns, oscillating floats, pendants, ducks and the like. The energy conversion system converts captured wave energy into mechanical energy in a certain form and further converts the mechanical energy into other energy forms, the current common method is to convert the wave energy into electric energy by using a hydraulic motor to generate a generator continuously, but the volumetric efficiency and the rotating speed of the rotary hydraulic pump are in a nonlinear relation, the volumetric efficiency is low at low speed, and the cost of the hydraulic motor is far higher than that of a hydraulic piston cylinder. In addition, because waves are mainly generated by blowing of sea surface wind, the main energy of the waves is concentrated in the directions of three degrees of freedom, namely pitching, surging and heaving, although the existing six-degree-of-freedom system can completely absorb the energy, the other degrees of freedom except the three degrees of freedom, namely pitching, surging and heaving, have less energy, and the motion with low energy density is captured by adopting a complex mechanism, so that the cost is increased, the energy capture efficiency is low, and the economic benefit is not improved. In conclusion, an energy harvesting device specially used for absorbing energy with three main degrees of freedom, namely pitching, pitching and heaving, is to be invented.

Disclosure of Invention

The invention provides a three-degree-of-freedom pendulum type wave energy harvesting device based on a six-rod mechanism, and solves the problem that the existing energy harvesting device is low in energy harvesting benefit.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:

a three-degree-of-freedom pendulum wave energy harvesting device based on a six-rod mechanism comprises a three-degree-of-freedom pendulum device arranged on a base, a floating piece connected with the three-degree-of-freedom pendulum device, an energy conversion device arranged on the three-degree-of-freedom pendulum device, an energy collecting device arranged on the base and the base, wherein the energy conversion device directly extracts energy in the longitudinal shaking, longitudinal swinging and heaving directions from the three-degree-of-freedom pendulum device and stores the energy into the energy collecting device.

Preferably, the three-degree-of-freedom six-connecting-rod pendulum device comprises a floating connecting part, a first transmission part and a second transmission part, the floating connecting part comprises two first connecting rods which are connected with a main shaft and a floating part, the two first connecting rods are oppositely arranged at two ends of the main shaft, a first slide rail is further arranged between the two first connecting rods, a first slide block is arranged on the first slide rail, the first slide block is connected to a base through first slide block extending shafts at two sides to fix the position of the first slide block relative to the base, the floating part drives the first connecting rods to move, and the first connecting rods drive the first slide block to move along the first slide rail;

the first transmission part comprises two second connecting rods which are connected with the main shaft and the base and are oppositely arranged at two ends of the main shaft, the second connecting rods are connected with the base through second connecting rod fixing shafts, and the main shaft moves to drive the second connecting rods to move;

the second transmission part comprises two third connecting rods, one end of each third connecting rod is connected with the main shaft, the two third connecting rods are oppositely arranged at two ends of the main shaft, the other end of each third connecting rod is connected with a second sliding block through a second sliding block extending shaft at two sides of the second sliding block, the second sliding block is arranged on a second sliding rail, the second sliding rail is arranged on the base, the first connecting rod drives the main shaft to move, the main shaft drives the third connecting rod to move, and the third connecting rod drives the second sliding block to move along the second sliding rail.

Preferably, the energy conversion device comprises a first hydraulic cylinder connected with one end of a piston rod of the first hydraulic cylinder and a second hydraulic cylinder connected with one end of a piston rod of the second hydraulic cylinder, the first hydraulic cylinder is arranged on the first slide rail, the second hydraulic cylinder is arranged on the second slide rail, the other end of the piston rod of the first hydraulic cylinder is connected with the first sliding block, and the other end of the piston rod of the second hydraulic cylinder is connected with the second sliding block.

Preferably, the energy collecting device comprises a first valve block group connected with the first hydraulic cylinder and the first energy accumulator, a second valve block group connected with the second hydraulic cylinder and the second energy accumulator, an oil tank connected with the first valve block group and the second valve block group, an energy accumulator switch valve and a hydraulic cylinder switch valve, wherein the first valve block group, the second valve block group, the first energy accumulator, the second energy accumulator, the oil tank, the energy accumulator switch valve and the hydraulic cylinder switch valve are arranged on the base.

Preferably, the float is a sphere, the float sealing against the surface of the wave in contact.

Preferably, the first link is stationary relative to the float.

The invention has the beneficial effects that:

1. the six-rod mechanism is adopted to drive the double hydraulic cylinders which are arranged in a non-parallel mode to capture wave energy, and the six-rod mechanism can move up and down, left and right and rotate in a plane, so that three-degree-of-freedom wave energy absorption is achieved. The three main wave motions of wave heaving, surging and surging are absorbed in a targeted manner, so that the wave energy capture efficiency and benefit are greatly improved;

2. the invention has clear structure, and solves the problem of low volumetric efficiency of the rotary hydraulic pump at low speed by using the mode that the hydraulic cylinder captures energy directly from the relative motion of the connecting rod, so that the rotary hydraulic pump has high efficiency under the condition of wave input under various sea conditions. The piston rod of the hydraulic cylinder is connected with the sliding block, the energy is directly captured along with the movement of the connecting rod, and the energy capture efficiency is improved by utilizing the characteristic of high volume rate of the hydraulic cylinder, so that the energy conversion efficiency is further improved;

3. the design of the hydraulic cylinders and the direct connecting rods is adopted, and compared with an expensive hydraulic motor, the cost of the three-degree-of-freedom pendulum type wave energy harvesting device based on the six-rod mechanism is greatly reduced by the selected double hydraulic cylinders.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a plan view of the present invention.

FIG. 3 is a schematic diagram of an energy conversion harvesting circuit according to the present invention.

The reference numbers illustrate:

1. a float member; 2. a first link; 3. a first slider; 4. a first slider outrigger shaft; 5. a first hydraulic cylinder piston rod; 6. a first slide rail; 7. a first hydraulic cylinder; 8. a main shaft; 9. a third link; 10. a second slider outrigger shaft; 11. a second slider; 12. a second hydraulic cylinder piston rod; 13. a second hydraulic cylinder; 14. a second slide rail; 15. a second link; 16. a second connecting rod fixing shaft; 17. a base; 17. a base; 18. a first accumulator; 19. a second accumulator; 20. a first set of valve blocks; 21. a second set of valve blocks; 22. an oil tank; 23. an accumulator on-off valve; 24. and a hydraulic cylinder switch valve.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "above … …", "above … …", "above … … upper surface", "above", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The invention provides a technical scheme that: a three-degree-of-freedom pendulum type wave energy harvesting device based on a six-rod mechanism is structurally shown in figures 1 and 2 and comprises a base 17, a three-degree-of-freedom six-connecting-rod pendulum type device arranged on the base 17, a floating piece 1 connected with the three-degree-of-freedom six-connecting-rod pendulum type device, an energy conversion device arranged on the three-degree-of-freedom six-connecting-rod pendulum type device and an energy collection device arranged on the base 17, wherein the schematic diagram of an energy conversion and collection loop is shown in figure 3. The energy conversion device directly extracts energy in the pitching, the surging and the heaving directions from the three-degree-of-freedom six-connecting-rod swinging device and stores the energy into the energy collection device. The floating member 1 is a sphere, and the surface of the floating member 1 contacted with waves is sealed.

The three-degree-of-freedom six-connecting-rod pendulum device comprises a floating connecting part, a first transmission part and a second transmission part, wherein the floating connecting part comprises a first connecting rod 2 which is connected with a main shaft 8 and a floating part 1, and the relative position of the first connecting rod 2 and the floating part 1 is kept unchanged. The two first connecting rods 2 are oppositely arranged at two ends of the main shaft 4, a first sliding rail 4 is further arranged between the two first connecting rods 2, a first sliding block 3 is arranged on the first sliding rail 4, the first sliding block 3 is connected to the base 17 through first sliding block extending shafts 4 at two sides to fix the position, relative to the base, of the first sliding block 8, the floating part 1 drives the first connecting rods 2 to move, and the first connecting rods 2 drive the first sliding blocks 3 to move along the first sliding rails 6;

the first transmission part comprises two second connecting rods 15 which are connected with the main shaft 8 and the base 17, the two second connecting rods 15 are oppositely arranged at two ends of the main shaft 8, the second connecting rods 15 are connected with the base 17 through second connecting rod fixing shafts 16, and the main shaft 8 moves to drive the second connecting rods 15 to move;

the second transmission part comprises two third connecting rods 9 with one ends connected with the main shaft 8, the three connecting rods 9 are oppositely arranged at two ends of the main shaft 8, the other ends of the third connecting rods are connected with a second sliding block 11 through second sliding block extending shafts 10 at two sides of the second sliding block 11, the second sliding block 11 is arranged on a second sliding rail 14, the second sliding rail 14 is arranged on a base 17, the first connecting rod 2 drives the main shaft 8 to move, the main shaft 8 drives the third connecting rods 9 to move, and the third connecting rods 9 drive the second sliding blocks 11 to move along the second sliding rail 14.

The six-rod mechanism comprises a first connecting rod 2, a first sliding block 3, a second connecting rod 15, a third connecting rod 9, a second sliding block 11 and a second sliding rail 14, and the six-rod structure drives the whole device to capture energy.

The energy conversion device comprises a first hydraulic cylinder 7 connected with one end of a first hydraulic cylinder piston rod 5 and a second hydraulic cylinder 13 connected with one end of a second hydraulic cylinder piston rod 12, the first hydraulic cylinder 7 is arranged on a first slide rail 6, the second hydraulic cylinder 13 is arranged on a second slide rail 14, the other end of the first hydraulic cylinder piston rod 5 is connected with a first slide block 3, and the other end of the second hydraulic cylinder piston rod 12 is connected with a second slide block 10.

The energy collecting device comprises a first valve block group 20 connected with the first hydraulic cylinder 3 and the first energy accumulator 18 and a second valve block group 21 connected with the second hydraulic cylinder 13 and the second energy accumulator 19, the first valve block group 20, the second valve block group 21, the first energy accumulator 18 and the second energy accumulator 19 are arranged on the base 17, the first valve block group 20 and the second valve block group 21 are both connected with an oil tank 22, the oil tank 22 is arranged on the base and provides hydraulic oil for the device, the other ends of the first valve block group 20 and the second valve block group 21 are connected with an energy accumulator switch valve 23 and a hydraulic cylinder switch valve 24, the energy accumulator switch valve 23 and the hydraulic cylinder switch valve 24 are both arranged on the base, so that the two energy accumulators are independently controlled, the two piston cylinders are controlled in a coupling mode, and the freedom degree of energy conversion and collection control is increased.

When the floating member 1 moves up and down with the wave, the first connecting rod 2 moves together with the floating member 1, and the movement comprises: surging, heaving and surging, the main shaft 8 connected with the first connecting rod 2 moves along with the tail end of the first connecting rod 2, the main shaft 8 drives the third connecting rod 9 to move, and the third connecting rod 9 drives the second sliding block 11 to do reciprocating motion along the second sliding rail 14. Meanwhile, the first connecting rod 2 moves to drive the first sliding block 3 to reciprocate along the first sliding rail 6. The first sliding block 3 drives the first hydraulic cylinder piston rod 5 to inject energy into the first hydraulic cylinder 7, the energy is transmitted to the first valve block group 20 through a hydraulic pipe, and the first valve block group 20 transmits the energy to the first energy accumulator 18 for energy accumulation. The second slider 11 drives the second hydraulic cylinder piston rod 12 to inject energy into the second hydraulic cylinder 13, the energy is transmitted to the second valve block group 21 through a hydraulic pipe, and the second valve block group 21 transmits the energy to the second energy accumulator 19 through the energy accumulator switch valve 23 and the hydraulic cylinder switch valve 24 for energy accumulation.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a three degree of freedom pendulum-type wave energy harvesting devices based on six-bar mechanism which characterized in that: the energy conversion device directly extracts energy in the pitching, pitching and heaving directions from the three-freedom six-connecting-rod swinging device and stores the energy into the energy collection device;

the three-degree-of-freedom six-connecting-rod pendulum device comprises a floating connecting part, a first transmission part and a second transmission part, wherein the floating connecting part comprises two first connecting rods (2) which are used for connecting a main shaft (8) and a floating part (1), the two first connecting rods (2) are oppositely arranged at two ends of the main shaft (8), a first sliding rail (6) is further arranged between the two first connecting rods (2), a first sliding block (3) is arranged on the first sliding rail (6), the first sliding block (3) is connected to a base (17) through first sliding block outward extending shafts (4) at two sides and used for fixing the position, relative to the base, of the first sliding block (3), the floating part (1) drives the first connecting rods (2) to move, and the first connecting rods (2) drive the first sliding block (3) to move along the first sliding rail (6);

the first transmission part comprises two second connecting rods (15) which are connected with the main shaft (8) and the base (17), the two second connecting rods (15) are oppositely arranged at two ends of the main shaft (8), the second connecting rods (15) are connected with the base (17) through second connecting rod fixing shafts (16), and the main shaft (8) moves to drive the second connecting rods (15) to move;

the second transmission part comprises two third connecting rods (9) with one ends connected with the main shaft (8), the three third connecting rods (9) are oppositely arranged at two ends of the main shaft (8), the other ends of the third connecting rods are connected with second sliding blocks (11) through second sliding block extending shafts (10) on two sides of the second sliding blocks (11), the second sliding blocks (11) are arranged on second sliding rails (14), the second sliding rails (14) are arranged on a base (17), the main shaft (8) is driven by the first connecting rods (2) to move, the main shaft (8) drives the third connecting rods (9) to move, and the third connecting rods (9) drive the second sliding blocks (11) to move along the second sliding rails (14).

2. The six-rod mechanism-based three-degree-of-freedom pendulum wave energy harvesting device according to claim 1, wherein: the energy conversion device comprises a first hydraulic cylinder (7) and a second hydraulic cylinder (13), wherein the first hydraulic cylinder (7) is connected with one end of a first hydraulic cylinder piston rod (5) and the second hydraulic cylinder (13) is connected with one end of a second hydraulic cylinder piston rod (12), the first hydraulic cylinder (7) is arranged on a first sliding rail (6), the second hydraulic cylinder (13) is arranged on a second sliding rail (14), the other end of the first hydraulic cylinder piston rod (5) is connected with a first sliding block (3), and the other end of the second hydraulic cylinder piston rod (12) is connected with a second sliding block (11).

3. The six-rod mechanism-based three-degree-of-freedom pendulum wave energy harvesting device according to claim 2, characterized in that: the energy collecting device comprises a first valve block group (20) connected with a first hydraulic cylinder (7) and a first energy accumulator (18) and a second valve block group (21) connected with a second hydraulic cylinder (13) and a second energy accumulator (19), wherein the first valve block group (20), the second valve block group (21), the first energy accumulator (18) and the second energy accumulator (19) are arranged on a base (17).

4. The six-rod mechanism-based three-degree-of-freedom pendulum wave energy harvesting device according to claim 1, characterized in that: the floating piece (1) is a sphere, and the surface of the floating piece (1) contacted with waves is sealed.

5. The six-rod mechanism-based three-degree-of-freedom pendulum wave energy harvesting device according to claim 1, characterized in that: the first connecting rod (2) and the floating piece (1) are relatively static.