CN201730734U - Straight blade vertical shaft swing type tidal energy conversion device - Google Patents

Abstract

The utility model relates to a straight blade vertical axis swing type tidal current energy conversion device, which belongs to the technical field of marine renewable energy utilization. It includes blade A (3), blade B (9), blade horizontal shaft (7), blade support (6), main shaft (1), auxiliary shaft (4), main swing arm (2), auxiliary swing arm ( 5), the base (8) and the generator; the blades A and B can drive the main and auxiliary swing arms to swing back and forth around the main and auxiliary axes; Quadrilateral linkage mechanism; when the swing arm rotates, the blade horizontal axis locker in the blade support locks the blade horizontal axis, when the blade A and the swing arm swing to one end to the preset maximum angle, the blade horizontal axis locks Loosen the blade A and the horizontal axis of the blade to rotate 180 degrees, the lock of the horizontal axis of the blade is locked again, the lift acting on the straight blade changes to the opposite direction, so that the blade A and the swing arm swing in the opposite direction to reach the maximum Repeat the above actions at the angle to make the swing arm swing back and forth continuously.

Description

Straight blade vertical axis swing type tidal current energy conversion device

technical field

The utility model relates to a straight blade vertical shaft swing type tidal current energy conversion device, which is further improved on the basis of the existing vertical shaft straight blade tidal current energy conversion device, and belongs to the technical field of marine renewable energy utilization.

Background technique

At present, tidal current energy conversion devices mainly include horizontal-axis impeller type and vertical-axis impeller type. In principle, existing tidal current energy conversion devices use hydrodynamic forces to act on the blades to generate torque and drive the shaft to rotate, thereby converting tidal current energy into The mechanical energy of the rotational motion of the shaft. Obviously, the greater the torque driving the shaft, the higher the output mechanical energy of the shaft, which means the higher the primary conversion efficiency from tidal current energy to mechanical energy. The advantage of the horizontal axis impeller device is that the energy conversion efficiency is relatively high, and the advantage of the vertical axis impeller device is that it can adapt to different tidal current directions, and the structure is simple and easy to manufacture.

The main disadvantage of the existing horizontal axis impeller device is: the diameter of the impeller is limited by the water depth and cannot be very large; in order to make the blades reach the optimal hydrodynamic characteristics everywhere along the span direction, the angle of attack of each section of the blades needs to be changed. The shape of the blade is complicated, the manufacturing difficulty is large, and the cost is high. In addition, from the perspective of the basic structure, the blade root is connected to the hub, the moment arm from the blade root section to the center of the rotating shaft is the shortest, and the moment arm from the blade tip section to the center of the rotating shaft is the longest. Therefore, there is always a small moment arm between some blades and the center of the rotating shaft, and the generated moment is also small.

The main disadvantage of the existing vertical axis impeller device is: due to the 360-degree rotation of the impeller, for a single blade, the position and direction of the blade are not optimal for more than half of the time, so its tidal current energy conversion efficiency is lower than Horizontal shaft impeller.

How to develop a high-efficiency tidal current energy conversion device that has both the advantages of the vertical-axis impeller and the horizontal-axis impeller is a problem that needs to be solved.

Utility model content

The utility model improves the circular motion of the blades and the rotary arm in the vertical axis impeller type tidal current energy conversion device to a small-angle swing motion mode, so that the blades of the tidal current energy conversion device are always kept in the optimal stress state and provide as large a force as possible. torque to increase the output power of the shaft. The vertical shaft device is adopted, and the arm rotates in the horizontal direction. When the strength and stiffness permit, the length of the arm can not be limited by the water depth. Under the condition that the blade is subjected to the same hydrodynamic force, a high torque can be obtained by lengthening the force arm; using straight blades, And the parallelogram linkage mechanism is used to make the blade always face the water flow direction at the optimal angle of attack, so that the maximum lift value can be achieved at all parts of the blade at the same time; the blade drives the swing arm to swing within a small angle range, which is different from the existing vertical axis The circular motion of the impeller device can prevent the blade from being in an unfavorable force-bearing position for a long time and reduce efficiency.

The technical scheme adopted in the utility model is:

A straight blade vertical shaft swing type tidal current energy conversion device, the tidal current energy conversion device includes blade A, blade B, blade horizontal shaft, blade support containing blade horizontal shaft locker, main shaft, auxiliary shaft, main swing arm , the auxiliary cantilever arm, the base containing the angular displacement limiter of the cantilever arm, and the generator; blades A and B can drive the main and auxiliary cantilever arms to swing back and forth around the main and auxiliary axes, and the swing angle is limited to a range of plus or minus 90 degrees symmetrical to the direction of water flow Inside.

The connecting line between the centers of the main shaft and the auxiliary shaft, the blade support, the main swing arm and the auxiliary swing arm form a parallelogram linkage, and the horizontal axis of the blade installed on the blade support is parallel to the flow direction of the current.

When the swing arm rotates, the blade horizontal axis locker in the blade support locks the blade horizontal axis; when the blade A and the main and auxiliary swing arms swing to one end to the preset maximum angle, the blade horizontal axis locker loosens. Open; blade A and the blade horizontal axis rotate 180 degrees, the blade horizontal axis locker locks again, the lift acting on the straight blade changes to the opposite direction, so that the blade A and the main and auxiliary arms swing in the opposite direction, reaching Repeat the above actions at the maximum angle to make the swing arm swing back and forth continuously.

The blade is fixed on the horizontal axis of the blade; the horizontal axis of the blade is installed on the blade support; the two ends of the blade support are respectively connected to the main swing arm and the secondary swing arm through a hinge device that can rotate in the horizontal plane; the main swing arm and the secondary swing arm They are respectively connected to the main shaft and the auxiliary shaft; the line connecting the blade support, the main and auxiliary swing arms, and the axes of the main and auxiliary shafts constitutes a parallelogram linkage mechanism, and the blades always face the direction of the water flow at the optimal angle of attack; the blades drive the swing arms, and the symmetrical Swing within a relatively small angle (less than plus or minus 90 degrees) of the current flow direction; when the swing arm rotates, the blade horizontal axis locker in the blade support is locked, and the blade horizontal axis cannot rotate; when the swing arm rotates to When one end swings to the preset maximum angular displacement, the blade horizontal axis locker is released, the blade and the blade horizontal axis rotate 180 degrees, the lift acting on the blade changes direction, and the blade horizontal axis locker locks again; Drive the swing arm to swing in the opposite direction, and when it reaches the preset maximum angular displacement of the swing, repeat the above actions.

The utility model has the beneficial effects of avoiding the shortcoming of the short arm of the horizontal axis impeller device and the poor conversion efficiency of the vertical axis impeller device, so that the straight blade is always in the state of maximum lift, and combined with the long spiral arm, the maximum The rotating torque greatly increases the output power of the main shaft, the structure is simple, and it is easy to manufacture and install.

Description of drawings

Figure 1a is a perspective view of a straight blade vertical axis swing type tidal current energy conversion device (the swing arm swings clockwise to the extreme position).

Fig. 1b is a top view of a straight blade vertical axis swing type tidal current energy conversion device.

Fig. 2a is a perspective view of the straight blade rotating around the horizontal axis when the swing arm swings to the extreme position.

Figure 2b is a top view of the straight blade rotating around the horizontal axis when the swing arm swings to the extreme position.

Figure 3a is a perspective view of the straight blade after turning 180 degrees around the horizontal axis.

Figure 3b is a top view of the straight blade after turning 180 degrees around the horizontal axis.

Fig. 4a is a perspective view of the swing arm swinging counterclockwise to the extreme position.

Figure 4b is a top view of the swing arm swinging counterclockwise to the extreme position.

In the figure: 1 main shaft, 2 main swing arms, 3 blades A, 4 secondary shafts, 5 pairs of swing arms, 6 blade supports, 7 blade horizontal shafts, 8 bases, and 9 blades B.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

In Fig. 1, both the main shaft 1 and the auxiliary shaft 4 are installed vertically on the base 8; the base 8 contains a swing arm angular displacement limiter to ensure that the swing arm can only rotate within a preset angle range; the blade 3 is fixedly installed on on the blade horizontal shaft 7; the blade horizontal shaft 7 is installed on the blade support 6, and can rotate around its own axis; the blade support 6 contains a blade horizontal shaft locker, and the locker locks the The horizontal axis of the blade is released when the swing arm moves to the preset maximum angular displacement, so that the blade and the horizontal axis of the blade are rotated 180 degrees and then locked again; the rear end of the blade support 6 is hinged with the main swing arm 2, and the blade support 6. The front end is hinged with the auxiliary swing arm 5, and the two hinge points can only rotate in the horizontal plane; in order to keep the center of gravity of the whole device on the main shaft, the rear blades 9 and their corresponding main and auxiliary swing arms and auxiliary shafts are arranged symmetrically to the main shaft and other components; the main shaft 1 and the auxiliary shaft 4 are connected, the main swing arm 2, the secondary swing arm 5, and the blade support 6. The four parts constitute a parallelogram mechanism, which ensures that the horizontal axis 7 of the blade always faces the direction of the incoming flow when the swing arm rotates ( It is assumed in the figure that the direction of water flow is from left to right); the main and auxiliary swing arms are staggered in height, so that they do not interfere with each other when rotating; the main shaft 1 is the power output shaft, which can drive a generator to generate electricity through gear transmission, or drive a hydraulic motor through a hydraulic device, and then Drive the generator to generate electricity.

In Fig. 1, the blade and the arm system are affected by the clockwise moment generated by the hydrodynamic force, and have swung to the clockwise limit position.

In Fig. 2, when the swing arm swings to the clockwise limit position, the locker in the blade support 6 is released, and by means of the moment generated by the force asymmetry of the blade on both sides of the horizontal axis (the blade on both sides of the horizontal axis size or angle of attack can be different), or use a servo motor to provide torque to make the blade 3 rotate around the horizontal axis 7 of the blade. Figure 2 is the state when the blades rotate to the horizontal position.

In Figure 3, when the blade 3 rotates 180 degrees around the horizontal axis 7 of the blade, the locker in the blade support is locked again, and the blade stops rotating. The torque makes the blade and the arm system start to swing counterclockwise.

In FIG. 4 , the blade and the swing arm system have swung to the counterclockwise extreme position, and the blade 3 will rotate 180 degrees around the blade horizontal axis 7 again. The above process is repeated continuously, so that the blade and the rotary arm system realize the reciprocating swing.

The two-way rotation of the main shaft can be converted into one-way rotation through the gear system to drive the generator to generate electricity. The hydraulic system can also be used to drive the hydraulic motor to rotate in one direction through the control of the one-way valve in the hydraulic circuit, and then drive the generator to generate electricity.

Claims (1)

1. a prismatic blade vertical shaft swing type trend can conversion equipment, it is characterized in that: this trend can conversion equipment comprises blade A (3), blade B (9), blade horizontal axis (7), the blade bearing (6) that includes blade horizontal axis locker, main shaft (1), countershaft (4), main jib (2), secondary spiral arm (5), includes the base (8) and the generator of spiral arm angular displacement limiter; Blade A (3) and blade B (9) can drive the major-minor spiral arm around major-minor axle reciprocally swinging, and pendulum angle is limited in and is symmetrical in the positive and negative 90 degree scopes of water (flow) direction;

The line of centres of main shaft (1) and countershaft (4), blade bearing (6), main jib (2), secondary spiral arm (5) constitute parallelogram linkage, and the blade horizontal axis (7) that is installed on the blade bearing (6) is parallel to the trend flow direction.

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