CN112901407B - A three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism - Google Patents

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

A three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism

technical field

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

Background technique

Wave energy is one of several new energy sources that are known to be reproducible and has important strategic value. Its research, development and utilization are of great significance to my country's energy security. The wave energy generation device is mainly composed of two parts: an energy capture system and an energy conversion system. The main forms of energy capture system are: oscillating water column type, oscillating float type, pendulum type, duck type, etc. The energy conversion system is to convert the captured wave energy into some form of mechanical energy and then further into other energy forms. At present, the more commonly used method is to convert wave energy into electrical energy by using a hydraulic motor with a generator. However, the rotary hydraulic The volumetric efficiency of the pump has a nonlinear relationship with the speed, and the volumetric efficiency is low at low speeds, and the cost of the hydraulic motor is much higher than that of the hydraulic piston cylinder. In addition, since the waves are mainly generated by the wind blowing on the sea surface, the main energy of the waves is concentrated in the three degrees of freedom directions of pitch, surge and heave. Although the existing six-degree-of-freedom systems can completely absorb The other degrees of freedom other than the three degrees of freedom, surge and heave have less energy, which leads to the use of complex mechanisms to capture low-energy density motions, resulting in increased costs and low energy capture efficiency, which is not conducive to economic benefits. improve. To sum up, it is yet to be invented an energy harvesting device specially used to absorb the energy of the three main degrees of freedom of pitch, surge and heave.

Contents of the invention

The invention provides a three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism, which solves the problem of low energy harvesting efficiency of the existing energy harvesting device.

For achieving above object, the technical scheme that the present invention takes is:

A three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism, comprising a three-degree-of-freedom six-link pendulum device arranged on a base, a floating floating Components, and the energy conversion device arranged on the three-degree-of-freedom six-link pendulum device and the energy harvesting device and the base arranged on the base, the energy conversion device directly from the three-degree-of-freedom six-link pendulum Energy in pitch, surge and heave directions is extracted in the device and stored in the energy harvesting device.

Preferably, the three-degree-of-freedom six-link pendulum device includes a floating connection part, a first transmission part and a second transmission part, the floating connection part includes a first connecting rod connecting the main shaft and the floating member, and the first There are two connecting rods, which are relatively arranged at both ends of the main shaft, and a first slide rail is also arranged between the two first connecting rods, and a first slider is arranged on the first slide rail, so The first slider is connected to the base through the extension shafts of the first sliders on both sides to fix the position of the first slider relative to the base, and the floating part drives the first connecting rod to move, so The first connecting rod drives the first slider to move along the first slide rail;

The first transmission part includes a second connecting rod connecting the main shaft and the base. There are two second connecting rods, which are oppositely arranged at both ends of the main shaft. The second connecting rods are fixed by the second connecting rods The shaft is connected to the base, and the movement of the main shaft drives the movement of the second connecting rod;

The second transmission part includes a third connecting rod with one end connected to the main shaft. There are two third connecting rods, which are arranged at opposite ends of the main shaft. The other end of the third connecting rod passes through the second slider The extension shafts of the second sliders on both sides are connected to the second sliders, the second sliders are arranged on the second slide rails, the second slide rails are arranged on the base, and the first connecting rod drives the The main shaft moves, the main shaft drives the third connecting rod to move, and the third connecting rod drives the second slider to move along the second slide rail.

Preferably, the energy conversion device includes a first hydraulic cylinder connected to one end of the piston rod of the first hydraulic cylinder and a second hydraulic cylinder connected to one end of the piston rod of the second hydraulic cylinder, the first hydraulic cylinder is arranged on the first slide On the 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 to the first slider, and the other end of the piston rod of the second hydraulic cylinder is connected to the second slider .

Preferably, the energy harvesting device includes a first valve block group connected with the first hydraulic cylinder and the first accumulator, and a second valve block group connected with the second hydraulic cylinder and the second accumulator, and the The oil tank connected to the first valve block group and the second valve block group, the accumulator switch valve and the hydraulic cylinder switch valve, the first valve block group, the second valve block group, the first accumulator, and the second energy storage The device, the oil tank, the switch valve of the accumulator and the switch valve of the hydraulic cylinder are arranged on the base.

Preferably, the floating member is a sphere, and the surface of the floating member in contact with waves is sealed.

Preferably, the first connecting rod and the floating member are relatively stationary.

The beneficial effects of the present invention are:

1. The present invention adopts a six-bar structure, which drives non-parallel dual hydraulic cylinders to capture wave energy. The six-bar mechanism can move up and down, left and right, and rotate in a plane to realize three-degree-of-freedom wave energy absorb. The three main wave motions of wave heave, surge and pitch are absorbed in a targeted manner, which greatly improves the efficiency and benefit of wave energy capture;

2. The structure of the present invention is clear, and the hydraulic cylinder is used to directly capture energy from the relative movement of the connecting rod, which solves the problem of low volumetric efficiency of the rotary hydraulic pump at low speed, so it can be used under various sea conditions and wave inputs. high efficiency. The piston rod of the hydraulic cylinder is connected to the slider, which directly captures energy with the movement of the connecting rod. The high volume ratio of the hydraulic cylinder is used to improve the energy capture efficiency, thereby further improving the energy conversion efficiency;

3. The present invention adopts the design of the hydraulic cylinder directly connected to the connecting rod. Compared with the expensive hydraulic motor, the selected dual hydraulic cylinder greatly reduces the cost of the three-degree-of-freedom pendulum wave energy harvesting device based on the six-bar mechanism .

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a plan view of the present invention.

Fig. 3 is a schematic diagram of the energy conversion and collection circuit of the present invention.

Explanation of reference numbers:

1. Floating part; 2. The first connecting rod; 3. The first slider; 4. The outreach shaft of the first slider; 5. The piston rod of the first hydraulic cylinder; 6. The first slide rail; 7. The first hydraulic pressure Cylinder; 8, main shaft; 9, the third connecting rod; 10, the extension shaft of the second slider; 11, the second slider; 12, the piston rod of the second hydraulic cylinder; 13, the second hydraulic cylinder; 14, the second Slide rail; 15, second connecting rod; 16, second connecting rod fixed shaft; 17, base; 17, base; 18, first accumulator; 19, second accumulator; 20, first valve Block group; 21, second valve block group; 22, fuel tank; 23, accumulator switching valve; 24, hydraulic cylinder switching valve.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be clear that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. In the absence of a contrary description, these orientation words do not indicate or imply the device or element referred to. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the scope of the present invention: the orientation words "inside and outside" refer to inside and outside relative to the outline of each part itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. 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 the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. its underlying device or construction". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of the present invention.

The present invention provides a technical solution: a three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism, its structure is shown in Figure 1 and Figure 2, including a base 17, three A six-link pendulum device with degrees of freedom, a floating member 1 connected to the six-link pendulum device with three degrees of freedom, an energy conversion device arranged on the six-link pendulum device with three degrees of freedom, and an energy conversion device arranged on the base 17 The schematic diagram of the energy harvesting device and the energy conversion harvesting circuit is shown in Fig. 3 . The energy conversion device directly extracts the energy in the pitch, surge and heave directions from the three-degree-of-freedom six-link pendulum device, and stores the energy in the energy harvesting device. The floating part 1 is a sphere, and the surface of the floating part 1 in contact with waves is sealed.

The three-degree-of-freedom six-link pendulum device includes a floating connection part, a first transmission part, and a second transmission part. The floating connection part includes the first connecting rod 2 connecting the main shaft 8 and the floating part 1. 1 The relative position remains unchanged. There are two first connecting rods 2, which are relatively arranged at both ends of the main shaft 4, and a first slide rail 4 is also arranged between the two first connecting rods 2, and a first slide block 3 is arranged on the first slide rail 4 , the first slider 3 is connected to the base 17 through the extension shafts 4 of the first slider on both sides to fix the position of the first slider 8 relative to the base, and the floating part 1 drives the first connecting rod 2 to move , the first connecting rod 2 drives the first slider 3 to move along the first slide rail 6;

The first transmission part includes the second connecting rod 15 connecting the main shaft 8 and the base 17. There are two second connecting rods 15, which are oppositely arranged at the two ends of the main shaft 8. The second connecting rod 15 fixes the shaft 16 through the second connecting rod. Connect the base 17, the movement of the main shaft 8 drives the movement of the second connecting rod 15;

The second transmission part includes a third connecting rod 9 with one end connected to the main shaft 8. There are two third connecting rods 9, which are arranged at opposite ends of the main shaft 8. The other end of the third connecting rod passes through the two sides of the second slider 11. The extension shaft 10 of the second slider is connected to the second slider 11, the second slider 11 is arranged on the second slide rail 14, the second slide rail 14 is arranged on the base 17, and the first connecting rod 2 drives the main shaft 8 to move , the main shaft 8 drives the third connecting rod 9 to move, and the third connecting rod 9 drives the second slider 11 to move along the second slide rail 14 .

The six-bar mechanism includes the first connecting rod 2, the first slider 3, the second connecting rod 15, the third connecting rod 9, the second slider 11 and the second slide rail 14. This six-bar structure drives the whole device to carry out energy captured.

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

The energy harvesting device includes a first valve block group 20 connected with the first hydraulic cylinder 3 and the first accumulator 18 and a second valve block group 21 connected with the second hydraulic cylinder 13 and the second accumulator 19, the first The valve block group 20, the second valve block group 21, the first accumulator 18 and the second accumulator 19 are arranged on the base 17, and the first valve block group 20 and the second valve block group 21 are connected to an oil tank 22. The oil tank 22 is set on the base to provide hydraulic oil for the device. The other ends of the first valve block group 20 and the second valve block group 21 are connected to the accumulator switch valve 23 and the hydraulic cylinder switch valve 24. The accumulator switch valve 23 and the hydraulic cylinder switching valve 24 are both arranged on the base, so as to independently control the two accumulators, coupled control the two piston cylinders, and increase the freedom of energy conversion and collection control.

When the floating part 1 moves up and down with the waves, the first connecting rod 2 moves together with the floating part 1. The movement includes: surge, heave, and pitch. The main shaft 8 connected to the first connecting rod 2 moves with the first connecting rod 2 The end moves, the main shaft 8 drives the third connecting rod 9 to move, and the third connecting rod 9 drives the second slider 11 to reciprocate along the second slide rail 14 . At the same time, the movement of the first connecting rod 2 drives the first slider 3 to reciprocate along the first slide rail 6 . The first slider 3 drives the first hydraulic cylinder piston rod 5 to inject energy into the first hydraulic cylinder 7, and the energy is transmitted to the first valve block group 20 through the hydraulic pipe, and the first valve block group 20 transmits the energy to the first accumulator The energy device 18 stores energy. The second slider 11 drives the second hydraulic cylinder piston rod 12 to inject energy into the second hydraulic cylinder 13, and the energy is delivered to the second valve block group 21 through the hydraulic pipe, and the second valve block group 21 passes the energy through the accumulator switch The valve 23 and the hydraulic cylinder switch valve 24 are sent to the second accumulator 19 for energy storage.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (5)

1. A three-degree-of-freedom pendulum type wave energy harvesting device based on a six-bar mechanism, characterized in that: comprise a three-degree-of-freedom six-link pendulum device arranged on the base (17), and the three-degree-of-freedom The floating member (1) connected to the six-link pendulum device, and the energy conversion device arranged on the three-degree-of-freedom six-link pendulum device, the energy harvesting device arranged on the base (17), and the base ( 17), the energy conversion device directly extracts the energy in pitch, surge and heave directions from the three-degree-of-freedom six-link pendulum device, and stores the energy in the energy harvesting device; The three-degree-of-freedom six-link pendulum device includes a floating connection part, a first transmission part and a second transmission part, and the floating connection part includes a first connecting rod (2) connecting the main shaft (8) and the floating part (1). ), the first connecting rod (2) is two, relatively arranged at the two ends of the main shaft (8), between the two first connecting rods (2) is also provided with a first slide rail ( 6), the first slide rail (6) is provided with a first slider (3), and the first slider (3) is connected to the base through the first slider extension shafts (4) on both sides (17) is used to fix the position of the first slider (3) relative to the base, the floating member (1) drives the first connecting rod (2) to move, and the first connecting rod (2) Drive the first slider (3) to move along the first slide rail (6); The first transmission part includes a second connecting rod (15) connecting the main shaft (8) and the base (17). There are two second connecting rods (15), which are oppositely arranged on the Both ends, the second connecting rod (15) is connected to the base (17) through the second connecting rod fixed shaft (16), and the movement of the main shaft (8) drives the movement of the second connecting rod (15); The second transmission part includes a third connecting rod (9) with one end connected to the main shaft (8), and there are two third connecting rods (9), which are arranged at opposite ends of the main shaft (8). The other end of the third connecting rod is connected to the second slider (11) through the second slider (10) on both sides of the second slider (11), and the second slider (11) is arranged on the second slider (11). On the slide rail (14), the second slide rail (14) is arranged on the base (17), the first connecting rod (2) drives the movement of the main shaft (8), and the main shaft (8) drives The third connecting rod (9) moves, and the third connecting rod (9) drives the second sliding block (11) to move along the second sliding rail (14). 2. The three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism according to claim 1, characterized in that: the energy conversion device includes a first hydraulic cylinder connected to one end of the piston rod (5). A hydraulic cylinder (7) and a second hydraulic cylinder (13) connected to one end of the second hydraulic cylinder piston rod (12), the first hydraulic cylinder (7) is arranged on the first slide rail (6), the first hydraulic cylinder The two hydraulic cylinders (13) are arranged on the second slide rail (14), the other end of the first hydraulic cylinder piston rod (5) is connected to the first slide block (3), and the second hydraulic cylinder piston rod (12 ) is connected to the second slider (11) at the other end. 3. The three-degree-of-freedom pendulum type wave energy harvesting device based on the six-bar mechanism according to claim 2, characterized in that: the energy harvesting device includes a first hydraulic cylinder (7) and a first accumulator ( 18) The connected first valve block group (20) and the second valve block group (21) connected with the second hydraulic cylinder (13) and the second accumulator (19), the first valve block group (20 ), the second valve block group (21), the first accumulator (18) and the second accumulator (19) are arranged on the base (17). 4. The three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism according to claim 1, characterized in that: the floating member (1) is a sphere, and the floating member (1) is in contact with waves Surface sealed. 5. The three-degree-of-freedom pendulum wave energy harvesting device based on a six-bar mechanism according to claim 1, characterized in that: the first connecting rod (2) and the floating member (1) are relatively stationary.

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