CN212253193U

CN212253193U - Rotating device for tracking solar energy

Info

Publication number: CN212253193U
Application number: CN202021433933.7U
Authority: CN
Inventors: 孙欢; 穆化敏; 郭银萍; 谭彭燕; 全龙浩; 陈春; 范洪营
Original assignee: Spaceflight Building Design Research Institute Co ltd
Current assignee: Spaceflight Building Design Research Institute Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-12-29
Anticipated expiration: 2030-07-20

Abstract

The utility model relates to the technical field of solar energy resource utilization, in particular to a rotary device for tracking solar energy, which comprises a fixed seat, a driving wheel, a driven wheel, a driving device, a heat collecting device and a heat radiating device; the driving device comprises a shape memory alloy, a driving push rod, a driving magnetic piece and a driven magnetic piece, wherein the magnetic poles of the driving magnetic piece and the driven magnetic piece are the same; a driven spring is arranged on the driven wheel; the heat collecting device comprises a heat collecting cover; the heat collecting cover is provided with a vent hole; the heat dissipation device comprises a sealing element which is connected with the heat collection cover in a sliding mode. The utility model discloses a shape memory alloy is as drive assembly, trails sun autogiration, "go motor" and "go electricization", need not external strong and weak current input, need not electrical system, need not extra power supply, autotracking sun, energy-concerving and environment-protective. The system does not need a complex control system, is simple to operate and maintain, has low cost, and saves manpower and material resources. The action process is completed by pure machinery, and is safe and reliable.

Description

Rotating device for tracking solar energy

Technical Field

The utility model belongs to the technical field of solar energy resource utilization technique and specifically relates to a rotary device for trail solar energy is related to.

Background

Under the condition of energy situation shortage, solar energy is increasingly paid attention to people as renewable clean energy. However, the utilization rate is relatively low due to the low solar energy density and the changing illumination direction. At the present stage, the traditional solar power generation and photo-thermal equipment installed at a fixed angle cannot track the change of the position of the sun, and the solar energy utilization rate is limited.

The existing solar automatic tracking system senses the position of the sun by using a sensor, controls a motor system by using a frequency converter, a PLC (programmable logic controller) or a single chip microcomputer, outputs a signal by using the sensor, amplifies the signal and then sends the amplified signal to a control unit, and the control unit starts to work and instructs an actuator to act to adjust a solar thermal collector, so that the function of tracking the sun by using the system is realized, and the utilization efficiency of solar energy is improved.

However, the existing solar automatic tracking system is complex in control and operation, needs professional maintenance regularly, and is high in cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotary device for following track solar energy to solve the complicated technical problem of control operation that exists among the prior art.

In order to solve the technical problem, the utility model provides a rotating device for tracking solar energy, which comprises a fixed seat, a driving wheel, a driven wheel, a driving device, a heat collecting device and a heat radiating device, wherein the driving wheel and the driven wheel are all in the shape of a circular ring; the driving wheel and the driven wheel are coaxially arranged and are both rotationally connected to the fixed seat;

the driving device comprises a shape memory alloy, a driving push rod, a driving magnetic part and a driven magnetic part, wherein the magnetic poles of the driving magnetic part and the driven magnetic part are the same; one end of the shape memory alloy is fixed with the driving wheel, and the other end of the shape memory alloy is fixed with the driving magnetic piece; the driven magnetic part is fixed with the driven wheel; when the other end of the shape memory alloy extends and is close to the driven magnetic part, the repulsive force between the driving magnetic part and the driven magnetic part can push the driving wheel to rotate;

a driven spring is arranged on the driven wheel; one end of the driving push rod is fixed with the driving wheel; when the driving wheel rotates, the other end of the driving push rod can be abutted against the driven spring and compress the driven spring;

the heat collecting device comprises a heat collecting cover; the heat collection cover is fixed with the driving wheel and covers the shape memory alloy; the heat collection cover is provided with a vent hole;

the heat dissipation device comprises a sealing element which is connected with the heat collection cover in a sliding mode; the sealing element is used for sealing the vent hole; the shape memory alloy is coupled to the seal for driving the seal away from the vent opening to open the vent opening.

Further, the heat collecting device comprises a condenser lens arranged at the top of the heat collecting cover;

and/or the heat collecting device comprises a shading plate arranged at the top of the heat collecting cover; when the driving wheel rotates, the light shielding plate can shield sunlight from irradiating the condensing lens.

Furthermore, the heat dissipation device comprises a connecting rod, a return spring and a fixing piece fixed with the driving wheel; the fixing piece is provided with a connecting hole; the connecting rod is slidably arranged in the connecting hole in a penetrating way; the sealing element is fixed at one end of the connecting rod, one end of the return spring is abutted against the sealing element, and the other end of the return spring is abutted against the fixing element; the return spring is compressed when the shape memory alloy pushes the seal away from the vent hole.

Furthermore, both ends of the heat collecting cover are provided with vent holes; sealing elements are arranged at two ends of the connecting rod; the sealing element at one end is positioned in the heat collection cover, and the sealing element at the other end is positioned outside the heat collection cover; the two sealing elements are respectively positioned on the same side of the two ventilation holes so as to seal the two ventilation holes.

Further, the fixing piece is circular; the fixing piece is sleeved outside the driving wheel and is fixed in the heat collection cover; the shape memory alloy can pass through the inner ring hole of the fixing piece to reciprocate.

Further, the driving magnetic part and the driven magnetic part are respectively a driving magnetic ring and a driven magnetic ring; the driving magnetic ring and the driven magnetic ring are both sleeved on the driving wheel.

Furthermore, a driven support rod is fixed on the driven wheel; the driven magnetic ring is fixed on the driven support rod.

Further, the shape memory alloy is spiral and is sleeved outside the driving wheel.

Furthermore, the heat collection cover is cylindrical, and two ends of the heat collection cover are provided with through holes; the heat collecting cover is fixedly arranged on the driving wheel in a penetrating way through the through hole.

Further, the sealing element is annular; the sealing element is sleeved outside the driving wheel.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a rotary device for trail solar energy adopts shape memory alloy as drive assembly, trails sun autogiration, "go motor" and "go electricization", need not external strong and weak current input, need not electrical system, need not extra power supply, autotracking sun, energy-concerving and environment-protective. The system does not need a complex control system, is simple to operate and maintain, has low cost, and saves manpower and material resources. The action process is completed by pure machinery, and is safe and reliable.

Drawings

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

Fig. 1 is a schematic structural diagram of a rotating device for tracking solar energy according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a heat collecting device provided in an embodiment of the present invention;

fig. 3 is another schematic structural diagram of a heat collecting device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a heat dissipation device according to an embodiment of the present invention.

Reference numerals:

1-a driving wheel; 2-a heat collecting device; 3-driven wheel;

4-active push rod; 5-a driven spring; 6-fixing the base;

7-passive support rods; 8-a vent hole; 9-a heat collecting cover;

10-shape memory alloy; 11-a pusher; 12-an active magnetic element;

13-a condenser; 14-a visor; 15-driven magnetic element;

16-perforating; 17-a seal; 18-a fixing member;

19-a return spring; 20-a connecting rod; 21-connecting hole.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be further explained with reference to specific embodiments.

As shown in fig. 1 to 4, the rotating device for tracking solar energy provided by this embodiment includes a fixing base 6, a driving wheel 1 and a driven wheel 3, which are both circular, a driving device, a heat collecting device 2, and a heat dissipating device; the driving wheel 1 and the driven wheel 3 are coaxially arranged and are both rotatably connected to the fixed seat 6; the driving device comprises a shape memory alloy 10, a driving push rod 4, a driving magnetic part 12 and a driven magnetic part 15, wherein the magnetic poles of the driving magnetic part and the driven magnetic part are the same; one end of the shape memory alloy 10 is fixed with the driving wheel 1, and the other end is fixed with the driving magnetic part 12; the driven magnetic part 15 is fixed with the driven wheel 3; when the other end of the shape memory alloy 10 extends and is close to the driven magnetic part 15, the repulsion force between the driving magnetic part 12 and the driven magnetic part 15 can push the driving wheel 1 to rotate;

a driven spring 5 is arranged on the driven wheel 3; one end of the driving push rod 4 is fixed with the driving wheel 1; when the driving wheel 1 rotates, the other end of the driving push rod 4 can be abutted against the driven spring 5 and compress the driven spring 5; the heat collecting device 2 comprises a heat collecting cover 9; the heat collecting cover 9 is fixed with the driving wheel 1 and covers the shape memory alloy 10; the heat collecting cover 9 is provided with a vent hole 8; the heat dissipation device comprises a sealing element 17 which is connected with the heat collection cover 9 in a sliding way; the sealing member 17 is used to seal the vent hole 8; the shape memory alloy 10 is connected to the sealing member 17 for driving the sealing member 17 away from the ventilation hole 8 to open the ventilation hole 8.

Wherein, the utility model discloses a shape memory alloy 10 be two-way memory alloy, through its operating temperature artificial settlement after reasonable domestication to should consider thermal-arrest and heat abstractor's thermal-arrest and radiating effect. When the temperature in the heat collecting and radiating device is higher than the operating temperature, the shape memory alloy 10 is elongated, and when the temperature is lower than the operating temperature, the memory alloy is contracted.

When using, fix solar device the utility model provides a on the rotary device, sealing member 17 is sealed with ventilation hole 8 on the thermal-arrest cover 9 during the initial time. As the heat collecting cover 9 receives the irradiation of sunlight, the temperature in the heat collecting cover 9 gradually rises, and when the operating temperature of the shape memory alloy 10 is reached, the shape memory alloy 10 stretches and the driving magnetic part 12 at the end part of the shape memory alloy gradually approaches to the driven magnetic part 15. Since the driving magnetic member 12 and the driven magnetic member 15 have the same polarity, they generate a repulsive force, which pushes the driving wheel 1 to rotate in a direction away from the driven magnetic member 15, and at this time, the driven wheel 3 remains stationary. Meanwhile, a driving push rod 4 on the driving wheel 1 is contacted with a driven spring 5 on the driven wheel 3 and gradually compresses the driven spring 5; when the shape memory alloy 10 extends to a certain extent, the sealing member 17 on the shape memory alloy is driven to move, so that the sealing member 17 is separated from the vent hole 8 of the heat collection cover 9, the vent hole 8 is opened, and heat dissipation of the heat collection cover 9 is started. Along with the heat dissipation effect of the vent holes 8, the temperature in the heat collection cover 9 is gradually reduced, the shape memory alloy 10 begins to shrink and drives the driving magnetic part 12 on the shape memory alloy to be far away from the driven magnetic part 15, the repulsive force between the driving magnetic part and the driven magnetic part is gradually reduced, the driven spring 5 is in a compression state, the elastic force of the driven spring 5 begins to push the driven wheel 3 to rotate towards the direction the same as the rotating direction of the driving wheel 1, and the driven magnetic part 15 is close to the driving magnetic part 12. And as the shape memory alloy 10 contracts, the sealing member 17 thereon also moves, thereby sealing the vent hole 8 again. At this time, the rotating device completes one rotation and simultaneously drives the solar device on the rotating device to rotate once. The rotation device rotates in the same direction continuously, so that the solar device is adjusted to be always in the sunlight irradiation direction.

Because initiative magnetic part 12 and driven magnetic part 15 set up the position difference, the utility model provides an action wheel 1 can clockwise rotation or anticlockwise rotation (in the top view direction), the user can set up and solar device between the relation of connection according to actual need, select the setting. Taking fig. 2 as an example, the driven magnetic element 15 is located at the right side of the driving magnetic element 12, and the driving wheel 1 rotates in the clockwise direction.

The utility model discloses a shape memory alloy 10 is as drive assembly, trails sun autogiration, "go motor" and "go electricization", need not external strong and weak current input, need not electrical system, need not extra power supply, and the autotracking sun is energy-concerving and environment-protective. The system does not need a complex control system, is simple to operate and maintain, has low cost, and saves manpower and material resources. The action process is completed by pure machinery, and is safe and reliable.

When the driving magnetic member 12 approaches the driven magnetic member 15, the repulsive force therebetween can push the driving wheel 1 to rotate in a direction away from the driven magnetic member 15, while the driven wheel 3 remains stationary. Therefore, the connection between the driving wheel 1 and the driven wheel 3 and the fixed seat 6 is required correspondingly. For example, the force to start rotating the driving pulley 1 is smaller than the force to start rotating the driven pulley 3. The realization mode can be that the screwing force of the driving wheel 1 and the fixed seat 6 is less than the screwing force of the driven wheel 3 and the fixed seat 6. For another example: the driving wheel 1 and the driven wheel 3 are rotatably connected with the fixing seat 6 through a flywheel, the flywheel can enable the driving wheel 1 and the driven wheel 3 to rotate only in the direction from the driven magnetic part 15 to the driving magnetic part 12, and therefore the driven wheel 3 cannot be pushed to rotate in the direction from the driving magnetic part 12 to the driven magnetic part 15 when being subjected to repulsive force, and therefore the driving wheel and the driven wheel are kept motionless.

Preferably, the driven wheel 3 is provided with a recess in which the driven spring 5 is located.

Preferably, the heat collecting device 2 comprises a condenser lens 13 disposed on the top of the heat collecting cover 9; and/or the heat collecting device 2 comprises a shading plate 14 arranged at the top of the heat collecting cover 9; when the driving wheel 1 rotates, the light shielding plate 14 can shield the sunlight from the condenser 13. The condensing lens 13 plays a condensing role, so that the temperature in the heat collection cover 9 is increased, and after the driving wheel 1 rotates, the light shielding plate 14 shields the condensing lens 13, so that the condensing lens 13 can not receive direct irradiation of sunlight and is matched with the heat dissipation effect of the ventilation holes 8, and the heat dissipation of the heat collection cover 9 can be realized quickly.

Wherein, the heat dissipating double-fuselage includes the brace rod 20, the reset spring 19, and the fixed part 18 fixed with driving wheel 1; the fixing member 18 is provided with a connecting hole 21; the connecting rod 20 is slidably arranged in the connecting hole 21 in a penetrating way; the sealing member 17 is fixed at one end of the connecting rod 20, one end of the return spring 19 is abutted with the sealing member 17, and the other end of the return spring 19 is abutted with the fixing member 18; the return spring 19 is compressed when the shape memory contract pushes the seal 17 away from the vent 8. When the shape memory alloy 10 is stretched, it pushes the sealing member 17 to move toward the driven magnetic member 15, the vent hole 8 is gradually opened, and the return spring 19 is compressed, which is in a heat dissipation mode. After the driving wheel 1 rotates and the shape memory alloy 10 contracts, the sealing element 17 moves back under the action of the return spring 19 to cover the ventilation hole 8 again, and the ventilation hole 8 is tightly pressed at the ventilation hole 8 through the elastic force of the return spring 19 to seal the ventilation hole 8, and at the moment, the heat collection mode is realized. That is, the ventilation hole 8 is opened to be in a heat radiation mode, the ventilation hole 8 is closed to be in a heat collection mode, and the heat collection-heat radiation mode can be circularly switched through the structure, so that the driving wheel 1 is pushed to rotate, and meanwhile, the return spring 19 can improve the sealing effect.

Preferably, a pushing member 11 is fixed on the shape memory alloy 10, the pushing member 11 moves along with the elongation of the shape memory alloy 10, and when the pushing member 11 reaches the position of the sealing member 17, the pushing member 11 pushes the sealing member 17 to move. The pushing piece 11 can be abutted with the sealing piece 17 through the vent hole 8, and can also be abutted with the sealing piece 17 through the perforation 16 on the heat collecting cover 9, so that the sealing piece 17 is pushed to move.

The heat collecting cover 9 can be provided with a vent hole 8 at one end only, and can also be provided with vent holes 8 at both ends. Preferably, both ends of the heat collecting cover 9 are provided with vent holes 8; both ends of the connecting rod 20 are provided with sealing elements 17; wherein, the sealing element 17 at one end is positioned in the heat collecting cover 9, and the sealing element 17 at the other end is positioned outside the heat collecting cover 9; the two seals 17 are located on the same side of the two vent holes 8, respectively, so as to seal the two vent holes 8. Wherein, the one end of connecting rod 20 is located the heat collecting cover 9 inside, and the other end passes ventilation hole 8 and is located the outside of heat collecting cover 9, can realize like this that two sealing members 17 are located ventilation hole 8 same side for when two sealing members 17 moved towards same direction, ventilation hole 8 at both ends can be opened simultaneously. Specifically, the pushing member 11 pushes the sealing member 17 at one end to move, and can simultaneously drive the sealing member 17 at the other end to move.

Wherein, the sealing member 17 can be selectively arranged on the left side or the right side of the vent hole 8 according to the rotating direction of the driving wheel 1, taking fig. 2 as an example, the driving wheel 1 rotates clockwise, and the sealing member 17 is arranged on the right side of the vent hole 8. The return spring 19 is located between the left sealing member 17 and the fixing member 18, the shape memory alloy 10 moves towards the right, the sealing member 17 is pushed towards the right, and the return spring 19 is compressed.

The fixing member 18 can be in various structures, for example, the fixing member 18 is fixed on the inner wall of the heat collecting cover 9 and is positioned above or below the driving wheel 1. Preferably, the fixing member 18 is circular; the fixing piece 18 is sleeved outside the driving wheel 1 and is fixed in the heat collecting cover 9; the shape memory alloy 10 is capable of reciprocating through the inner annular ring of the fastener 18. The fixing part 18 is directly sleeved outside the driving wheel 1, so that the structure is compact, the occupied space is small, and the fixing part 18 is convenient to arrange. Preferably, the fixing member 18 is formed in a net shape, so that the ventilation holes 8 at both ends can be smoothly communicated, and the heat dissipation efficiency can be improved.

The shapes of the driving magnetic part 12 and the driven magnetic part 15 can be various, and preferably, the driving magnetic part 12 and the driven magnetic part 15 are a driving magnetic ring and a driven magnetic ring respectively; the driving magnetic ring and the driven magnetic ring are both sleeved on the driving wheel 1.

Preferably, a driven support rod 7 is fixed on the driven wheel 3; the driven magnetic ring is fixed on the driven support rod 7, so that the sliding connection between the driven magnetic ring and the driving wheel 1 can be realized, and the driven magnetic ring is fixedly connected with the driven wheel 3, and the structure is simple.

The shape memory alloy 10 can be arranged above or below the driving wheel 1, and preferably, the shape memory alloy 10 is spiral and is sleeved outside the driving wheel 1.

The shape of the heat collecting cover 9 can be various, the heat collecting cover 9 can be arranged above or below the driving wheel 1, preferably, the heat collecting cover 9 is cylindrical, and two ends of the heat collecting cover 9 are provided with through holes 16; the heat collecting cover 9 is fixed on the driving wheel 1 through a perforation 16.

The shape of the sealing member 17 may be various, and preferably, the sealing member 17 is a circular ring; the sealing element 17 is sleeved outside the driving wheel 1. As long as the sealing member 17 can cover the ventilation hole 8. The inner ring diameter of the seal 17 is larger than the diameter of the shape memory alloy 10 so that the seal 17 reciprocates outside the shape memory alloy 10.

In summary, taking the structure of fig. 1-4 as an example, the left end of the shape memory alloy 10 is fixed to the driving wheel 1, and the right end is fixed to the driving magnetic element 12; the driven magnetic part 15 is positioned at the right side of the driving magnetic part 12, and the sealing part 17 is positioned at the right side of the ventilation hole 8; the return spring 19 is positioned between the sealing member 17 at the left end and the fixing member 18; the driven spring 5 is located on the left side of the active push rod 4. The utility model provides a rotary device's complete function process does: as the temperature in the heat collecting cover 9 rises, the right end of the shape memory alloy 10 moves towards the right, the driving magnetic part 12 at the right end of the shape memory alloy gradually approaches the driven magnetic part 15, the repulsive force between the driving magnetic part and the driven magnetic part is gradually increased, the driving wheel 1 is pushed to rotate clockwise, and the driven wheel 3 is kept still at the moment. When the pushing piece 11 on the shape memory alloy 10 contacts with the sealing piece 17 at the right end along with the extension of the shape memory alloy, the pushing piece 11 pushes the sealing piece 17 at the right end, the connecting rod 20 and the sealing piece 17 at the left end to move rightwards, the ventilation hole 8 is opened, and the return spring 19 is compressed and is in a heat dissipation state. When the temperature is reduced, the shape memory alloy 10 contracts, and the return spring 19 restores the sealing element 17 to the original position and starts to be in a heat collection state again. Therefore, circulation is achieved, the rotating wheel continuously rotates for a certain angle in the clockwise direction, and the position of the solar device is adjusted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A rotating device for tracking solar energy is characterized by comprising a fixed seat, a driving wheel, a driven wheel, a driving device, a heat collecting device and a heat radiating device, wherein the driving wheel and the driven wheel are all in a circular ring shape;

the driving wheel and the driven wheel are coaxially arranged and are both rotationally connected to the fixed seat;

2. The rotating device for tracking solar energy as claimed in claim 1, wherein the heat collecting means comprises a condenser lens disposed on top of the heat collecting cover;

3. The rotating device for tracking solar energy as claimed in claim 1, wherein the heat dissipating means comprises a connecting rod, a return spring, a fixing member fixed with the driving wheel;

the fixing piece is provided with a connecting hole; the connecting rod is slidably arranged in the connecting hole in a penetrating way; the sealing element is fixed at one end of the connecting rod, one end of the return spring is abutted against the sealing element, and the other end of the return spring is abutted against the fixing element; the return spring is compressed when the shape memory alloy pushes the seal away from the vent hole.

4. The rotating device for tracking solar energy as claimed in claim 3, wherein both ends of the heat collecting cover are provided with ventilation holes; sealing elements are arranged at two ends of the connecting rod; the sealing element at one end is positioned in the heat collection cover, and the sealing element at the other end is positioned outside the heat collection cover; the two sealing elements are respectively positioned on the same side of the two ventilation holes so as to seal the two ventilation holes.

5. A rotary device for tracking solar energy as claimed in claim 3, wherein the fixed member is annular in shape; the fixing piece is sleeved outside the driving wheel and is fixed in the heat collection cover; the shape memory alloy can pass through the inner ring hole of the fixing piece to reciprocate.

6. The rotary device for tracking solar energy as claimed in claim 1, wherein the driving magnetic member and the driven magnetic member are a driving magnetic ring and a driven magnetic ring, respectively; the driving magnetic ring and the driven magnetic ring are both sleeved on the driving wheel.

7. A rotary device for tracking solar energy as defined in claim 6, wherein a passive support bar is fixed to the driven wheel; the driven magnetic ring is fixed on the driven support rod.

8. The rotary device for tracking solar energy as claimed in claim 1, wherein the shape memory alloy is in a spiral shape and is sleeved outside the drive wheel.

9. The rotating device for tracking solar energy as claimed in claim 1, wherein the heat collecting cover is cylindrical, and both ends of the heat collecting cover are provided with through holes; the heat collecting cover is fixedly arranged on the driving wheel in a penetrating way through the through hole.

10. A rotary device for tracking solar energy as defined in claim 1, wherein said seal is annular in shape; the sealing element is sleeved outside the driving wheel.