CN106401856B - Half active fluid pressure type series connection flapping foil marine tidal-current energy is caught can device - Google Patents

Abstract

The invention provides a semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device, which consists of front and rear hydrofoil drive hydraulic cylinders, front and rear hydrofoil assemblies, hydrofoil swing arms, columns, bases, energy acquisition hydraulic cylinders and other components. , the hydrofoil is driven by the crank-slider mechanism with the two-way hydraulic cylinder as the driving part to realize the pitching motion with the angle of attack running according to the predetermined law. The swing drive energy acquisition hydraulic cylinder obtains high-pressure oil, and the energy acquisition hydraulic cylinder outputs high-pressure oil to drive the hydraulic motor and the power generation device to generate electricity, realizing the energy conversion from tidal current energy to electric energy. The device is composed of two sets of hydrofoil assemblies arranged in series in front and back. This series arrangement realizes the full utilization of tidal current energy under the condition of constant sweep area. The invention has the characteristics of simple and compact structure, convenient installation, low noise, adaptability to different cross-sectional areas of water flow, full acquisition of tidal current energy, and easy application in shallow water.

Description

Semi-active hydraulic series swing hydrofoil tidal current energy harvesting device

technical field

The invention relates to an energy harvesting device, in particular to a semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device.

Background technique

The discovery and utilization of petroleum has promoted the rapid development of industry, and therefore petroleum has become the "blood of industry". The extraction cost of oil is low, but oil is non-renewable, and oil reserves are expected to decrease sharply in the next few decades. Finding renewable energy alternatives to petroleum will become a top priority.

In recent years, various types of renewable energy have been continuously developed and utilized, such as nuclear energy, solar energy, and wind energy. Among them, tidal current energy is an important part of new energy, and its reserves in the world are more than 10×10 ⁸ W. China has abundant tidal current energy resource reserves. The development and utilization of tidal current energy resources are very important for the improvement of energy structure and the sustainable development of energy. strategic significance. The hydraulic oscillating turbine captures energy from the incoming flow and converts the incoming flow energy into electrical energy. This damless turbine is similar to a wind turbine, and the kinetic energy of water flow is superior to that of wind in many ways, the most important of which are greater energy density and better predictability.

At present, the utilization of tidal current energy is mostly the use of rotating blade turbines and corresponding generators for energy capture. However, there are some problems in this tidal current energy capture method, such as: large footprint, fast tidal current speed, large noise, relatively The movement of the fast-rotating water turbine blades will have disadvantages such as affecting the surrounding marine life.

Organisms in the ocean, such as tuna, dolphins, sharks, etc., use the swing of the tail/fin to obtain energy from the surrounding water to swim, which has the characteristics of high efficiency, low noise, and good hydrodynamic characteristics. Inspired by this, in recent years, there has been a new research on fluid energy capture technology based on swinging hydrofoils. It has the advantages of low impact on the environment, low noise, high energy capture efficiency, and can be used in shallow water. Basic research in this area was carried out earlier in the United Kingdom, Ireland, the United States, Canada and other countries. my country has vast tidal current energy marine resources. At present, there are relatively few domestic technical reports on swinging tidal current energy harvesting devices and related technology research in China compared with foreign countries.

At present, there are semi-active hydraulic series swing hydrofoil tidal current energy harvesting devices in China, such as the patent application number 201310473753. The kinetic energy of the up and down movement is converted into the hydraulic energy of the hydraulic system connected to it, and then the converted hydraulic energy is converted into the electric energy of the generator. The principle and working process are different. For example, the patent application number is 201410663950.2, and the name is "swing-type hydrofoil tidal current energy generation device", which realizes energy extraction through the principle of crank-rocker mechanism, and controls the angle of attack through another set of crank-rocker mechanism. The principle of hydrofoil angle-of-attack control and The device structure and the patent of the present invention are all different. Domestically, there are no related invention patents for the tidal current energy harvesting device that hydraulically controls the swing to realize the hydrofoil cycle cycle.

Contents of the invention

The purpose of the present invention is to provide a semi-active hydraulic series swing hydrofoil tidal current energy harvesting device with simple mechanical structure, convenient installation, high reliability and high efficiency, which is a device capable of capturing tidal current energy or river energy. device.

The object of the present invention is achieved in that it includes a support part, an energy extraction part, a hydrofoil swing angle control part and an airfoil movement part, the support part includes a base and a column arranged on the base, and the energy extraction part includes a swing Arm, two energy harvesting hydraulic cylinders, the center position of the swing arm and the upper end of the column are hinged through the hydrofoil swing arm shaft, the two energy harvesting hydraulic cylinders are symmetrically arranged on both sides of the column, and each energy harvesting hydraulic cylinder The cylinder body is hinged to the column, and the piston rod is hinged to the swing arm. The hydrofoil swing angle control part includes two driving hydraulic cylinders and two drive shafts symmetrically arranged at both ends of the swing arm. Two symmetrically arranged on the swing arm Drive the hydraulic cylinder shaft, the cylinder body of each drive hydraulic cylinder is hinged with the corresponding drive hydraulic cylinder shaft, the end of the piston rod is connected with the corresponding drive shaft through the ear ring, and the airfoil moving part includes symmetrically arranged on each drive shaft Hydrofoils at both ends, and each hydrofoil is also connected with the swing arm through the hydrofoil rotating shaft.

The present invention also includes such structural features:

1. Each hydrofoil includes the hydrofoil blade, the hydrofoil inner baffle and the hydrofoil outer baffle arranged at both ends of the hydrofoil blade, and the baffle end caps respectively arranged on the hydrofoil inner baffle and the hydrofoil outer baffle , the hydrofoil rotating shaft passing through the hydrofoil blade, the hydrofoil inner baffle and the hydrofoil outer baffle, and the shaft sleeve fixedly connected with the baffle end cover, and the shaft sleeve is connected with the end of the hydrofoil drive shaft.

2. The hydrofoil blade is a hollow fiberglass structure.

3. The base is provided with a sliding guide rail, and the bottom of the column is inserted into the sliding guide rail and fixed with bolts.

Compared with the prior art, the beneficial effects of the present invention are: 1. The semi-active hydraulic series swing hydrofoil tidal current energy harvesting device uses energy acquisition cylinders, swing booms and columns to form components such as swing booms as active parts The unique crank rocker mechanism realizes the conversion of swing mechanical energy and hydraulic energy. The hydrofoil is driven by hydraulic pressure to realize the pitching motion, and the piston of the hydraulic cylinder is used as the original moving part to form a crank slider mechanism with the hydrofoil and the swinging arm to realize the regular swing of the hydrofoil; it has the advantages of simple structure, convenient installation, low noise and easy operation. Shallow water applications and other advantages, there is a lot of room for development in the future tidal current energy capture. 2. Controlling the amount of hydraulic oil can realize the random swing of the hydrofoil. The swing law of the arm of the passive tidal energy harvesting device and the law of the pitching motion of the hydrofoil have been fixed in a single motion form. Compared with the passive tidal energy harvesting device In other words, the device can realize arbitrary regular movement under the hydraulic drive, realize the control of different motion rules and the change control of different attack angles of the hydrofoil, and the device has flexible transmission and convenient control. 3. The column and base of the device are designed with slide rails, which overcomes the shortcomings of the connection fatigue between the column and the base caused by the back and forth swing of the hydrofoil. The specific structure is shown in Figure 6; it has the advantages of simple structure and reliable connection. 4. The base is made of welded plates, and the contact area between the base and the ground is large, which greatly reduces the shortcomings of the base sinking or inconvenient installation due to the large amount of sediment on the river bed or seabed. 5. Compared with the previous water turbine with rotating blades, it has the advantages of high transmission efficiency, low noise, and easy application in shallow water, and has little impact on the environment and aquatic organisms.

Description of drawings

Fig. 1 is the overall three-dimensional structural diagram of the present invention;

Fig. 2 is a structural diagram of the energy conversion part of the present invention;

Fig. 3 is the cross-sectional view of the hydrofoil swing angle control part of the present invention;

Fig. 4 is the structural diagram of the hydrofoil swing angle control part of the present invention;

Fig. 5 is the sectional view of airfoil part structure of the present invention;

Fig. 6 is a structural schematic diagram of the supporting part of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The components included in the present invention are: hydrofoil drive shaft 1, hydrofoil drive shaft sleeve 2, front hydrofoil inner baffle end cover 3, hydrofoil shaft end cover 4, hydrofoil shaft 5, front hydrofoil inner baffle 6 , hydrofoil blade 7, front hydrofoil outer baffle plate 8, swing arm 9, hydrofoil driving cylinder rotating shaft lug end cover 10, hydrofoil driving cylinder rotating shaft ear seat 11, hydrofoil driving cylinder rotating shaft 12, hydrofoil driving cylinder 13 , hydrofoil drive cylinder piston rod 14, rear hydrofoil inner baffle plate 15, rear hydrofoil outer baffle plate 16, energy acquisition cylinder piston rod lug 17, energy acquisition cylinder piston rod shaft 18, hydrofoil swing arm shaft 19, energy Extraction cylinder piston rod 20, column 21, energy acquisition cylinder body 22, energy acquisition cylinder ear seat shaft 23, energy acquisition cylinder ear seat 24, base 25, hydrofoil end plate tension screw 26, rear hydrofoil outer stop Plate end cover 27, front hydrofoil outer baffle end cover 28.

The present invention describes a novel semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device. The overall structure is shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. The wing swing angle control part, the airfoil movement part and the support part, etc., the front and rear ends of the swing arm of the energy extraction part are arranged in the middle of the front hydrofoil assembly and the rear hydrofoil assembly, and the airfoil movement part The up and down heave motion under the action of the incoming flow is converted into the reciprocating swing of the swing arm, which is transmitted to the energy conversion part to obtain high-pressure hydraulic oil, which drives the hydraulic motor to generate electricity; the hydrofoil swing angle control part is connected to the airfoil movement through control Partly drives the hydraulic cylinder to control the angle of attack of the airfoil movement part. The support part mainly plays the role of supporting the whole device and connecting the structures of each part. The energy conversion part finally realizes the conversion of the mechanical energy of the reciprocating swing of the swing arm into high-pressure oil. The advantage is that firstly, the hydrofoils are arranged in series to realize the full extraction of energy under the condition of constant sweep area, and the overall structure is compact and efficient; secondly, the hydraulic cylinder is used to actively control the angle of attack of the hydrofoils to realize different angles of attack of the hydrofoils. The real-time control of the movement law can openly control the sweep area of the hydrofoil to realize the energy extraction to adapt to different flow conditions.

The energy extraction part is shown in Figure 1, Figure 2, and Figure 6, which converts the heave and swing mechanical energy of the airfoil movement part into hydraulic energy, mainly including the piston rod ear seat 17 of the energy acquisition cylinder, the piston rod shaft 18 of the energy acquisition cylinder, and the hydrofoil swing Arm shaft 19, energy harvesting cylinder piston rod 20, column 21, energy harvesting cylinder body 22, energy harvesting cylinder lug seat rotating shaft 23, energy harvesting cylinder ear seat 24; energy harvesting hydraulic cylinder 22 is divided into front and rear symmetrical sets, The energy harvesting hydraulic cylinder 22 is used to transform the mechanical energy of the swing arm into hydraulic energy. A swing arm 9 with symmetrical front and rear structures is used for connecting the airfoil moving part and driving the movement of the hydraulic cylinder 22 . The swing arm 9 is connected to the column 21 through a sliding bearing and a hydrofoil swing arm shaft 19. The swing arm 9 is made of aluminum alloy material. The bottom of the swing arm 9 is 250mm from the center of the swing arm shaft axis, and a connecting lug 17 is provided. Among them are the bearings, lugs for attachment to the piston shaft lugs of the energy harvesting hydraulic cylinders. A connecting lug 24 is provided at a place 330 mm away from the shaft center below the column, and there is a bearing inside, and the lug is used for connecting the earrings of the energy harvesting cylinder body. The swing arm 9, the energy acquisition cylinder 22 and the column 21 form a crank-rocker mechanism to realize the conversion of swing mechanical energy into hydraulic energy in the form of high-pressure oil.

The hydrofoil swing angle control part is shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, hydrofoil drive shaft 1, hydrofoil drive shaft sleeve 2, hydrofoil shaft end cover 4, hydrofoil shaft 5, swing arm 9, hydrofoil Wing driving cylinder rotating shaft trunnion end cover 10, hydrofoil driving cylinder rotating shaft trunnion 11, hydrofoil driving cylinder rotating shaft 12, hydrofoil driving cylinder 13, hydrofoil driving cylinder piston rod 14; , the hydraulic flow is controlled through an external hydraulic base station, the position and speed of the piston rod 14 of the hydraulic cylinder operate according to a predetermined rule, and then the real-time control of the swing angle of the airfoil is realized through the transmission of the slider crank mechanism with the slider as the driving part; The driving hydraulic cylinder 13 is fixed on the swing arm 9 of the energy extraction part. The swing arm 9 is provided with an ear seat 11 with bearings inside. The earrings of the cylinder body of the hydraulic drive cylinder are connected to the ear seat to realize the rotation of the cylinder body 13 around the ear seat 11 . The hydraulic cylinder piston rod earring 14 is connected to the drive shaft 1 of the hydrofoil moving part to realize the rotation of the ear around the axis of the drive shaft. The swing angle control requirements of the hydrofoil are determined according to the piston position of the hydraulic pump station driving the cylinder. It can effectively control the hydrofoil to achieve different swing angles (that is, different attack angles of motion).

The hydrofoil angle of attack movement control part is composed of front and rear hydrofoils. The front hydrofoil movement part consists of hydrofoil 7NACA0012 blades, front hydrofoil inner baffle 6, front hydrofoil outer baffle 8, front hydrofoil inner baffle end cover 3, Front hydrofoil outer baffle plate end cover 28, hydrofoil rotating shaft 4, hydrofoil driving shaft 1, hydrofoil driving shaft bushing 2 and other parts are connected to form. A total of four identical hydrofoil blades are selected, and each two hydrofoils constitute a hydrofoil unit, and the two hydrofoils are connected by a threaded drive shaft to form a single hydrofoil unit; a single hydrofoil is based on the hydrofoil blade 7 is the main body, the two ends of the hydrofoil are inserted into the front hydrofoil inner baffle 6 and the front hydrofoil outer baffle 8, the inner and outer baffles are provided with slotted holes, the front hydrofoil inner baffle end cover 3, the front hydrofoil outer baffle The plate end cover 28 is embedded in it, and two long bolts 26 intersperse the hydrofoil drive shaft sleeve 2, the inner hydrofoil baffle 6, the hydrofoil blade 7, the outer hydrofoil baffle 8, and the outer hydrofoil end cover 28 together, The hydrofoil rotation shaft intersperses the inner hydrofoil baffle 6, hydrofoil blade 7, outer hydrofoil baffle 8, and outer hydrofoil end cover 28; the hydrofoil rotation shaft is connected to the swing arm 9 of the energy acquisition part, and the hydrofoil The wing drive shaft sleeve is connected to the hydrofoil drive shaft 1. The hydrofoil consists of four hydrofoils, two of which are connected in series on the swing arm of the energy harvesting part; the hydrofoil is made of fiberglass and has a hollow structure. The baffle is made of welded and milled aluminum alloy sheet. Due to the influence of the swing range of the front and rear hydrofoil drive shafts, the structures of the front and rear hydrofoil end covers are different. As shown in Figure 5, the axis of the front hydrofoil drive shaft is located at the leading edge of the hydrofoil. The axis of the rear hydrofoil drive shaft is located at the rear edge of the hydrofoil. If the same hydrofoil structure is used, there must be interference between the hydrofoil drive shaft at one end and the swing arm.

The supporting part of the hydrofoil is shown in Fig. 1, Fig. 2 and Fig. 6; it is composed of a column 21 and a base 25. The column and the base are welded by Q235 plate and the surface is blued. There is a sliding guide rail on the top of the base 25, and the bottom of the column 21 is inserted into the guide rail, and connected by four evenly arranged bolts. Since the column 21 is swayed by the swing arm, it is easy to cause the column to be loosely connected to the base. The guide rail ensures that the column is completely fixed on the base. The energy acquisition part is connected to the column by the ear seat to ensure the fixed rotation of the swing arm of the energy acquisition part. The function of the support part is to fix the overall mechanism, connect the energy acquisition part, the hydrofoil movement part and other components and the fixed movement of each part. A fixed rotation of the swing arm of the energy harvesting section is guaranteed.

The working principle of the present invention is: the principle of the semi-active hydraulic series swing hydrofoil tidal current energy harvesting device: drive the hydraulic cylinder to control the different movement rules and changes of different attack angles of the front and rear hydrofoils. The lifting force is generated under the action, and the up and down continuous heave motion of the hydrofoil swing arm 9 is realized. The earring 17 of the swing arm 9 is connected to the energy acquisition hydraulic cylinder, and the up and down movement of the swing arm drives the piston rod of the energy acquisition hydraulic cylinder to drive the hydraulic oil to generate high pressure to drive the ground hydraulic station to generate electricity. The invention has the advantages of simple structure, convenient installation, low noise, and easy application in shallow water, and has great development space in the future tidal current energy capture.

Claims (5)

1. The semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device is characterized in that: it includes a support part, an energy extraction part, a hydrofoil swing angle control part and an airfoil movement part, and the support part includes a base and is arranged on the base The upper column, the energy extraction part includes a swing arm, two energy acquisition hydraulic cylinders, the center position of the swing arm and the upper end of the column are hinged through the hydrofoil swing arm shaft, and the two energy acquisition hydraulic cylinders are symmetrically arranged on the column On both sides, and the cylinder body of each energy harvesting hydraulic cylinder is hinged to the column, and the piston rod is hinged to the swing arm. The hydrofoil swing angle control part includes two drive hydraulic cylinders and two drive shafts symmetrically arranged at both ends of the swing arm. , two drive hydraulic cylinder shafts are symmetrically arranged on the swing arm, the cylinder body of each drive hydraulic cylinder is hinged to the corresponding drive hydraulic cylinder shaft, the end of the piston rod is connected to the corresponding drive shaft through an earring, and the wing The type moving part includes hydrofoils symmetrically arranged at both ends of each drive shaft, and each hydrofoil is also connected with the swing arm through the hydrofoil rotating shaft. 2. The semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device according to claim 1, characterized in that: each hydrofoil comprises a hydrofoil blade, a hydrofoil inner baffle and a hydrofoil that are arranged at both ends of the hydrofoil blade Foil outer baffles, baffle end covers respectively arranged on the hydrofoil inner baffles and hydrofoil outer baffles, hydrofoil rotating shafts passing through the hydrofoil blades, the hydrofoil inner baffles and the hydrofoil outer baffles, and the baffles The end cover is fixedly connected to the shaft sleeve, and the shaft sleeve is connected with the end of the hydrofoil driving shaft. 3. The semi-active hydraulic type series swing hydrofoil tidal current energy harvesting device according to claim 1 or 2, characterized in that: the hydrofoil blade is a hollow glass fiber reinforced plastic structure. 4. The semi-active hydraulic series swing hydrofoil tidal current energy harvesting device according to claim 1 or 2, characterized in that: the base is provided with a sliding guide rail, and the bottom of the column is inserted into the sliding guide rail and fixed with bolts . 5. The semi-active hydraulic series swing hydrofoil tidal current energy harvesting device according to claim 3, characterized in that: the base is provided with a sliding guide rail, and the bottom of the column is inserted into the sliding guide rail and fixed with bolts.