power generation device

Abstract

This utility model discloses a power generation device. The power generation device includes: an impeller, which is sleeved on a rotating shaft, and the impeller has multiple blades evenly distributed thereon, the blades being shape-memory metal blades; and a casing, which surrounds a portion of the impeller, the area surrounded by the casing being the hot zone of the impeller and the area not surrounded by the casing being the cold zone of the impeller. When the blades move from the cold zone to the hot zone, they change from contraction to extension, generating a driving force on the cold zone. The end of the casing located in the cold zone that enters the hot zone interacts with the outer end of the blades, causing the blades to rotate towards the hot zone under the action of a reaction force. When the blades in the hot zone enter the cold zone, they are cooled and change from extension to contraction before re-entering the hot zone, continuously rotating in a cycle. This device achieves the alternation of hot and cold ends of the shape-memory metal blades without relying on gravity, and generates electricity by utilizing the driving force generated by the deformation of the blades at the interface between the cold and hot zones, resulting in less force loss, more converted mechanical energy, and significantly improved energy recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of energy recovery technology, and in particular to a power generation device. Background Technology

[0002] There is a significant demand for heat in the industrial and commercial sectors, resulting in substantial waste heat generation. With increasing per capita energy consumption and worsening environmental pollution, energy conservation and emission reduction have become a social consensus. High-temperature waste heat can be utilized through waste heat power generation, a method already widely adopted. However, for low-temperature waste heat and smaller-volume waste heat, aside from a small portion used to generate hot water locally, most is wasted. This is particularly evident in the automotive sector. Despite improvements in engine and combustion technologies, only about 40% of the energy consumed by car engines is converted into usable energy, while 60% is dissipated as waste heat, making it difficult to effectively utilize these low-temperature energy sources.

[0003] In related technologies, there are waste heat recovery devices that utilize the thermal contraction of shape memory alloys to move a slider, which in turn drives a coil to cut magnetic field lines and generate electricity, thus achieving partial energy recovery. However, the thermal alternation of the shape memory alloy is achieved by shifting the device's center of gravity through slider movement and using gravitational potential energy. This means that the device can only be assembled along the direction of gravity, greatly limiting its application scenarios. Furthermore, since shape memory alloys are assembled on both sides of the slider, when one side of the shape memory alloy deforms to do work, it must overcome both the gravitational potential energy of the slider and the deformation resistance of the other side of the shape memory alloy, resulting in extremely low energy utilization. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a power generation device that can achieve the alternation of hot and cold ends of shape memory metal blades without the aid of gravity. It generates electricity by utilizing the driving force generated by the deformation of the blades when passing through the interface between the cold and hot zones, resulting in less force loss, more converted mechanical energy, and significantly improved energy recovery efficiency.

[0005] The power generation device according to an embodiment of the present invention includes: an impeller sleeved on a rotating shaft, the impeller having a plurality of blades evenly distributed thereon, the blades being shape memory metal blades; and a housing surrounding a portion of the impeller, the area surrounded by the housing being the hot zone of the impeller and the area not surrounded by the housing being the cold zone of the impeller. When the blades move from the cold zone to the hot zone, they change from contraction to extension, generating a pushing force on the cold zone. The end of the housing located in the cold zone that enters the hot zone interacts with the outer end of the blades, causing the blades to rotate towards the hot zone under the action of a reaction force. When the blades in the hot zone enter the cold zone, they are cooled and change from extension to contraction before re-entering the hot zone, continuously rotating in a cycle.

[0006] According to the embodiment of the present invention, the power generation device adopts a wheel-type circulation structure to realize the cyclic rotation of the blades. The cold and hot ends of the shape memory metal blades can be alternated without the aid of gravity. The power generation is generated by the deformation of the shape memory metal blades at the junction of the cold and hot zones. This can realize the conversion of thermal energy into electrical energy. The shape of the blades makes the force loss small and the mechanical energy converted more, which can significantly improve the energy recovery efficiency.

[0007] According to some embodiments of the present invention, the rotating shaft is evenly distributed with multiple stages of impellers along its axial length, and the blades of each stage of the impellers have different deformation temperatures; wherein, the rotating shaft is selectively driven by one stage of the impellers to rotate continuously.

[0008] According to some embodiments of the present invention, the deformation temperature of the blades of the multi-stage impeller varies stepwise along the axial length of the rotating shaft.

[0009] According to some embodiments of the present invention, a sleeve is provided at the center of the impeller, the sleeve is sleeved on the rotating shaft, the rotating shaft has a hollow center and is provided with a plurality of first openings, and the sleeve of each stage of the impeller is provided with a second opening corresponding to the first opening; it also includes: a telescopic device, the telescopic device including a plurality of telescopic members, each telescopic member being provided at the first opening of the rotating shaft, and the telescopic member being movable into the corresponding first opening and second opening.

[0010] According to some embodiments of the present invention, the telescopic device further includes: a temperature sensor for detecting the temperature of the hot zone; a processor configured to determine, based on the first temperature detected by the temperature sensor, whether the first temperature reaches the deformation temperature of a certain stage of the impeller; if the first temperature reaches the deformation temperature of the certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the rotating shaft to the corresponding first opening and second opening.

[0011] According to some embodiments of the present invention, the processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the shaft to its corresponding first opening and second opening; after time t1, if the second temperature detected by the temperature sensor is lower than the deformation temperature of the impeller of that stage, the telescopic member corresponding to that stage of the impeller retracts from the first opening and the second opening back into the shaft.

[0012] According to some embodiments of the present invention, the processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the rotating shaft to its corresponding first opening and second opening; after time t2, the third temperature detected by the temperature sensor reaches the deformation temperature of the impeller of the previous stage, the telescopic member corresponding to that stage of the impeller retracts into the rotating shaft, and the telescopic member corresponding to the impeller of the previous stage moves from the rotating shaft to its corresponding first opening and second opening.

[0013] According to some embodiments of the present invention, the multi-stage impeller includes at least a first-stage impeller, a second-stage impeller, and a third-stage impeller. The first-stage impeller has a first deformation temperature T1, the second-stage impeller has a second-stage deformation temperature T2, and the third-stage impeller has a third-stage deformation temperature T3. Wherein, T3 > T2 > T1, and the difference between T3 and T2 is equal to the difference between T2 and T1.

[0014] According to some embodiments of the present invention, the power generation device further includes: a heat insulation plate, which is disposed between adjacent impellers and is used to separate the hot zone and the cold zone.

[0015] According to some embodiments of the present invention, the inner wall of the outer shell at the end where the cold zone enters the hot zone is formed with a pushing groove. When the blade enters the pushing groove from the cold zone into the hot zone, it changes from contraction to extension to generate a pushing force on the cold zone, and the blade rotates towards the hot zone under the action of the reaction force.

[0016] According to some embodiments of the present invention, the sidewall of the push groove adjacent to the cold zone is flat, and the sidewall of the push groove away from the cold zone and its bottom are curved.

[0017] According to some embodiments of the present invention, the power generation device further includes a charging system, one end of the rotating shaft being connected to the charging system for converting the mechanical energy of the impeller into electrical energy.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of a power generation device according to an embodiment of the present utility model;

[0021] Figure 2 This is a partial structural diagram of a power generation device according to an embodiment of the present utility model. Figure 1 ;

[0022] Figure 3 This is a partial structural diagram of a power generation device according to an embodiment of the present utility model. Figure 2 ;

[0023] Figure 4 This is a partial cross-sectional schematic diagram of a power generation device according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the power generation principle of the power generation device according to an embodiment of the present utility model.

[0025] Figure label:

[0026] 1. Impeller; 11. Blade; 12. Sleeve; 13. Second opening; 14. First stage impeller; 15. Second stage impeller; 16. Third stage impeller; 17. Fourth stage impeller; 2. Shaft; 21. First opening; 3. Outer shell; 31. Push groove; 4. Telescopic component; 5. Heat insulation plate; 6. Charging system. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0028] The following is for reference. Figures 1-5 This invention describes a power generation device according to an embodiment of the present invention.

[0029] like Figures 1-5 As shown, the power generation device includes an impeller 1 and a housing 3. The impeller 1 is mounted on a rotating shaft 2 and has multiple blades 11 evenly distributed on it. The blades 11 are shape memory metal blades 11. The housing 3 surrounds a portion of the impeller 1. The area surrounded by the housing 3 is the hot zone of the impeller 1, and the area not surrounded by the housing 3 is the cold zone of the impeller 1.

[0030] Among them, blade 11 is made of shape memory metal, whose crystal structure changes with temperature when it is in the solid state. For example, the crystal structure of nickel-titanium alloy is different above and below 40°C. When the temperature changes at 40°C, the nickel-titanium alloy will shrink or expand, causing its shape to change. That is, 40°C is the deformation temperature of nickel-titanium shape memory alloy.

[0031] In this embodiment, the blade 11 made of shape memory metal undergoes different deformations at high and low temperatures. The blade 11 shrinks at low temperatures and extends at high temperatures. Specifically, the blade 11 is arc-shaped. When the external temperature rises, the curvature of the blade 11 decreases, and when the external temperature returns to normal, the curvature of the blade 11 returns to its original shape.

[0032] The impeller 1 has multiple blades 11 made of shape memory metal evenly arranged on it, forming a wheel-like rotating structure. A portion of the impeller 1 is covered by a shell 3. This area covered by the shell 3 is the hot zone where the impeller 1 is located; this hot zone is where waste heat is generated by the vehicle or other equipment / devices. When the blades 11 of the impeller 1 rotate into the hot zone, they exchange heat with the hot zone, thus carrying away the heat. The area of ​​the impeller 1 not covered by the shell 3 is the cold zone where the impeller 1 is located; this cold zone is where the impeller 1 comes into contact with the ambient airflow. When the impeller 1 rotates under the propulsion of the airflow in the cold zone, it can exchange heat carried by the blades 11 in the hot zone with the airflow in the cold zone, effectively cooling the blades 11. In other words, the rotation of the impeller 1 achieves cooling and heat dissipation in the hot zone.

[0033] Based on this, when the blade 11 moves from the cold zone to the hot zone, it changes from contraction to extension, generating a driving force on the cold zone. The outer shell 3, located at the end where the blade 11 moves from the cold zone to the hot zone, interacts with the outer end of the blade 11, causing the blade 11 to rotate towards the hot zone under the action of the reaction force. When the blade 11 in the hot zone moves into the cold zone, it is cooled and changes from extension to contraction before re-entering the hot zone, continuously rotating in a cycle.

[0034] Specifically, the blades 11 on impeller 1 tend to straighten as they move from the cold zone to the hot zone, generating a pushing force on the cold zone. At this time, the outer end of the blade 11 pushes against the cold zone at the end of the outer casing 3 where it enters the hot zone. Since the outer casing 3 is fixed, the blade 11 rotates towards the hot zone under the action of the reaction force, simultaneously driving the shaft 2 to rotate. When the next undeformed blade 11 approaches the outer casing 3 at the end where it enters the hot zone, the blade 11 deforms again as it passes from the cold zone to the hot zone, driving the shaft 2 to rotate. This cycle repeats, effectively dissipating heat from the hot zone. Furthermore, one end of the shaft 2 is connected to the charging system 6, which consists of a fixed magnet and a magnetic coil. When the shaft 2 rotates, the connected magnetic coil cuts magnetic lines of force to generate electrical energy, thus converting heat energy into electrical energy and effectively utilizing the waste heat from the hot zone.

[0035] Therefore, this utility model embodiment adopts a wheel-type circulation structure to realize the cyclic rotation of the blades 11. The cold and hot ends of the shape memory metal blades 11 can be alternated without the aid of gravity. Furthermore, the propulsion force generated by the deformation of the shape memory metal blades 11 at the junction of the cold and hot zones can generate electricity, thereby converting thermal energy into electrical energy. The shape of the blades 11 results in less force loss and more converted mechanical energy, which can significantly improve energy recovery efficiency.

[0036] Furthermore, the rotating shaft 2 has multiple impellers 1 evenly distributed along its length, and the blades 11 of each impeller 1 have different deformation temperatures; wherein, the rotating shaft 2 is selectively driven by one of the impellers 14 to rotate continuously.

[0037] In other words, impellers 1 with different temperature gradients are evenly distributed on the rotating shaft 2. When the temperature of the hot zone reaches the deformation temperature of a certain stage of impeller 1, the impeller 1 of that stage drives the rotating shaft 2 to rotate, thereby generating electricity through the continuous rotation of the impeller 1. If the power generation device only has one type of impeller 1 with a deformation temperature, when the temperature of the hot zone is too high, the impeller 1 may not cool down to the corresponding temperature after one rotation, causing the curvature of the impeller 1 to not return to its previous straight state. This will result in the impeller 1 not being able to continue to generate enough force to drive the rotating shaft 2 to rotate, thus interrupting the thermal power generation process. For example, when the temperature of the hot zone reaches 70°C, when the blade 11 passes from the cold zone to the hot zone, the blade 11 tends to straighten due to the high temperature. The driving force generated by the blade 11 is blocked at the end of the outer casing 3 located between the cold and hot zones, causing the reaction force generated by the blade 11 to drive the impeller 1 to rotate. The rotating impeller 1 drives the rotating shaft 2 to rotate, and the rotating shaft 2 transmits the power to the power generation system. The entire process converts thermal energy into kinetic energy. When the temperature in the hot zone exceeds 70℃ and reaches 80℃, due to the increased temperature difference, impeller 1 may not cool back to its original temperature after one rotation, resulting in insufficient deformation of the blades 11 to drive the shaft 2 to rotate. However, by setting multiple stages of impellers 1 on the shaft 2, when the temperature in the hot zone reaches 80℃, the shaft 2 is decoupled from the impeller 1 with a deformation temperature of 70℃, and the shaft 2 is driven to rotate by the impeller 1 with a deformation temperature of 80℃. At this time, the power of the entire power generation device is mainly provided by the rotation of the impeller 1 with a deformation temperature of 80℃. The different deformation temperatures of the blades 11 in each stage of the impeller 1 can be achieved by changing the composition of the shape memory metal. It should be noted that each stage of the impeller 1 includes at least one impeller 1.

[0038] Therefore, this embodiment uses shape memory metal with multi-stage temperature gradient changes. Based on the actual temperature of the hot zone and the deformation temperature of each stage of impeller 1, the rotating shaft 2 is selectively bound to one stage of impeller 1. As the temperature difference between the hot zone and the external environment increases, the rotating shaft 2 is selectively bound to the impeller 1 with a higher deformation temperature and unbound from the previously bound impeller 1. This ensures that the impeller 1 always has sufficient power to drive the rotating shaft 2 to rotate, ensuring continuous power generation from heat energy. It effectively avoids the shape memory metal from recovering too slowly due to excessively high temperatures, greatly improving energy recovery efficiency.

[0039] Furthermore, the deformation temperature of the blades 11 of the multi-stage impeller 1 varies stepwise along the axial length of the shaft 2. In other words, the deformation temperature of the multi-stage impeller 1 increases / decreases stepwise from one end of the shaft 2 to the other, exhibiting a stepped temperature gradient. Thus, as the temperature difference between the hot zone and the ambient temperature of the cold zone increases, each stage of the impeller 1, from the lower temperature stage to the higher temperature stage, sequentially drives the shaft 2 to rotate, which is beneficial to the stable operation of the overall power generation device.

[0040] Furthermore, the multi-stage impeller 1 includes at least a first-stage impeller 14, a second-stage impeller 15, and a third-stage impeller 16. The first-stage impeller 14 has a first deformation temperature T1, the second-stage impeller 15 has a second-stage deformation temperature T2, and the third-stage impeller 16 has a third-stage deformation temperature T3. Among these, T3 > T2 > T1, and the difference between T3 and T2 is equal to the difference between T2 and T1.

[0041] In a specific embodiment, the multi-stage impeller 1 includes a first-stage impeller 14, a second-stage impeller 15, a third-stage impeller 16, and a fourth-stage impeller 17. For example, the first-stage impeller 14 has a first deformation temperature of 70°C, the second-stage impeller 15 has a second-stage deformation temperature of 80°C, the third-stage impeller 16 has a third-stage deformation temperature of 90°C, and the fourth-stage impeller 17 has a fourth-stage deformation temperature of 100°C. The deformation temperature difference between adjacent impeller stages 1 is 10°C. This utility model includes, but is not limited to, the above embodiments.

[0042] Furthermore, a sleeve 12 is provided at the center of the impeller 1, and the sleeve 12 is fitted onto the rotating shaft 2. The rotating shaft 2 has a hollow structure at its center and is provided with multiple first openings 21. Each sleeve 12 of the impeller 1 is provided with a second opening 13 corresponding to the first opening 21. The impeller 1 also includes a telescopic device, which includes multiple telescopic components 4. Each telescopic component 4 is provided at the first opening 21 of the rotating shaft 2 and can move into the corresponding first opening 21 and second opening 13.

[0043] Specifically, a hollow sleeve 12 is provided at the center of the impeller 1, and one end of the blade 11 is fixed to the sleeve 12. The sleeve 12 is fitted onto the rotating shaft 2. The rotating shaft 2 has multiple first openings 21, and each stage of the impeller 1's sleeve 12 has a second opening 13. The first openings 21 and second openings 13 are the same size. Each telescopic component 4 is located at the first opening 21 in the rotating shaft 2 and can move into its corresponding first opening 21 or second opening 13. By moving the telescopic component 4 from the first opening 21 to the first opening 21 or second opening 13 in the rotating shaft 2, the impeller 1 corresponding to the telescopic component 4 can be bound to the rotating shaft 2. When the telescopic component 4 retracts from the first opening 21 or second opening 13 back to the first opening 21 in the rotating shaft 2, the impeller 1 is unbound from the rotating shaft 2. Therefore, based on the hot zone temperature and the deformation temperature of each stage of the impeller 1, the rotating shaft 2 can be selectively driven to rotate by one of the impeller stages 14, achieving continuous power generation from thermal energy. That is, the telescopic device is used to realize or release the fixed connection between the rotating shaft 2 and one of the first-stage impellers 14.

[0044] Furthermore, the telescopic device also includes a temperature sensor and a processor. The temperature sensor is used to detect the temperature of the hot zone. The processor is configured to determine whether the first temperature detected by the temperature sensor has reached the deformation temperature of a certain stage impeller 1. If the first temperature reaches the deformation temperature of a certain stage impeller 1, the telescopic member 4 corresponding to that stage impeller 1 moves from the rotating shaft 2 to the corresponding first opening 21 and second opening 13.

[0045] Specifically, a temperature sensor is installed in the hot zone to detect the real-time temperature of the hot zone. When the processor receives the first temperature of the hot zone detected by the temperature sensor, the processor determines whether the first temperature has reached the deformation temperature of one stage impeller 14 based on the first temperature and the deformation temperature of each stage impeller 1. If the first temperature reaches the deformation temperature of one stage impeller 14, the telescopic member 4 corresponding to that stage impeller 1 moves from the rotating shaft 2 to the corresponding first opening 21 and second opening 13, locking the stage impeller 1 to the rotating shaft 2, and the stage impeller 1 drives the rotating shaft 2 to rotate.

[0046] Furthermore, the processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage impeller 1, the telescopic member 4 corresponding to that stage impeller 1 moves from the rotating shaft 2 to its corresponding first opening 21 and second opening 13; after time t1, if the second temperature detected by the temperature sensor is lower than the deformation temperature of that stage impeller 1, the telescopic member 4 corresponding to that stage impeller 1 retracts from the first opening 21 and second opening 13 back into the rotating shaft 2.

[0047] Specifically, during the process of binding the impeller 1 and the shaft 2, the impeller rotates synchronously. After time t1, if the second temperature detected by the temperature sensor is lower than the deformation temperature of the impeller 1, the blades 11 of the impeller 1 will return to their original shape. Then, the telescopic component 4 corresponding to the impeller 1 will retract to the first opening 21 in the shaft 2, thus releasing the binding between the impeller 1 and the shaft 2.

[0048] Furthermore, the processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage impeller 1, the telescopic component 4 corresponding to the stage impeller 1 moves from the rotating shaft 2 to its corresponding first opening 21 and second opening 13; after time t2, the third temperature detected by the temperature sensor reaches the deformation temperature of the stage impeller 14 of the previous stage impeller 1, the telescopic component 4 corresponding to the stage impeller 1 retracts into the rotating shaft 2, and the telescopic component 4 corresponding to the previous stage impeller 14 moves from the rotating shaft 2 to its corresponding first opening 21 and second opening 13.

[0049] Specifically, during the process of binding the impeller 1 to the shaft 2, the impeller rotates synchronously. After time t2, the third temperature detected by the temperature sensor reaches the deformation temperature of the impeller 14 above the impeller 1, which means that the power provided by the impeller 1 is insufficient. Therefore, the telescopic component 4 corresponding to the impeller 1 retracts into the shaft 2, and the telescopic component 4 corresponding to the impeller 14 moves from the shaft 2 to the corresponding first opening 21 and second opening 13, so that the impeller 14 above can provide power.

[0050] Specifically, in this embodiment, when the temperature of the hot zone reaches 70°C, it reaches the deformation temperature of the first-stage impeller 14, controlling the extension of the telescopic component 4 to extend and lock the first-stage impeller 14 and the shaft 2 corresponding to the telescopic component 4. When the first-stage impeller 14 passes from the cold zone to the hot zone, the blades 11 tend to straighten due to the high temperature. The outer end of the blades 11 is blocked at the end of the outer casing 3 where the hot air enters the cold zone. The resulting reaction force drives the impeller 1 to rotate. The rotating first-stage impeller 14 drives the shaft 2 to rotate, and the shaft 2 transmits power to the power generation system. The entire process converts thermal energy into kinetic energy. When the temperature of the hot zone exceeds 70°C and reaches 80°C, due to the increased temperature difference, the first-stage impeller 14 may not cool back to its original temperature after one rotation, resulting in insufficient deformation of the impeller 1 to drive the shaft 2 to rotate. At this point, the telescopic component 4 at the secondary impeller 15 extends, locking the secondary impeller 15 and the shaft 2. Simultaneously, the telescopic component 4 at the primary impeller 14 retracts, unbinding the primary impeller 14 and the shaft 2. The rotation of the primary impeller 14 will not drive the shaft 2 to rotate, and the power of the entire recovery device is mainly provided by the secondary impeller 15. Similarly, when the hot zone temperature rises to 90℃, the telescopic component 4 of the tertiary impeller 16 activates, locking the tertiary impeller 16 and the shaft 2. At the same time, the telescopic component 4 of the secondary impeller 15 retracts, unbinding the secondary impeller 15 and the shaft 2. When the hot zone temperature rises to 100℃, the working principle is the same as described above, and will not be repeated.

[0051] Furthermore, the power generation device also includes: a heat insulation plate 5, which is disposed between adjacent impellers 1 and serves to separate the hot zone and the cold zone. This arrangement, as... Figure 1 As shown, the heat insulation plate 5 is positioned between adjacent impellers 1. The center of the heat insulation plate 5 is concentric with the rotating shaft 2, and one end of the heat insulation plate 5 is connected to one end of the outer casing 3 and the other end of the heat insulation plate 5 is connected to the other end of the outer casing 3. This is used to separate the hot zone and the cold zone, and at the same time separate each stage of the impeller 1.

[0052] Furthermore, a pushing groove 31 is formed on the inner wall of the outer shell 3 at the end where the cold zone enters the hot zone. When the blade 11 enters the pushing groove 31 from the cold zone, it changes from contraction to extension, generating a pushing force on the cold zone. Under the action of the reaction force, the blade 11 rotates towards the hot zone.

[0053] Specifically, the push groove 31 is located at the junction of the cold zone and the hot zone. Driven by the airflow in the cold zone, the blades 11 on the impeller 1 tend to straighten as they enter the push groove 31 from the cold zone to the hot zone, thus generating a pushing force on the cold zone. At this time, the outer end of the blade 11 generates a pushing force on the cold zone towards the push groove 31 of the outer casing 3. Since the outer casing 3 is fixed, the blade 11, under the action of the component force F1 of the reaction force F, drives the rotating shaft 2 to rotate towards the hot zone, and the force of F2 is consumed. At this time, the deformed blade 11 rotates away from the push groove, and the next undeformed blade 11 approaches the push groove 31. At this time, the blade 11 again deforms as it passes from the cold zone to the hot zone, driving the rotating shaft 2 to rotate, and so on in a cycle.

[0054] Furthermore, the sidewall of the push groove 31 adjacent to the cold zone is flat, while the sidewall of the push groove 31 away from the cold zone and its bottom are curved. Specifically, the sidewall of the push groove 31 adjacent to the cold zone is straight, while the sidewall of the push groove 31 away from the cold zone and its bottom together form an arc. This shape facilitates the contact between the blade 11 and the sidewall of the push groove 31 adjacent to the cold zone to generate thrust during deformation. The other walls of the push groove 31 are also curved, which can prevent the blade 11 from generating resistance when it contacts the outer casing 3, thus avoiding hindering the relative rotation of the rotating shaft 2 and consuming unnecessary energy. In addition, in this embodiment, the outer casing 3 is semi-circular and coaxial with the rotating shaft 2.

[0055] Furthermore, the power generation device also includes a charging system 6, one end of which is connected to the rotating shaft 2 to convert the mechanical energy of the impeller 1 into electrical energy. The charging system 6 includes a fixed magnet and a magnetic coil. When the rotating shaft 2 rotates, the magnetic coil connected to it cuts the magnetic field lines to generate electrical energy, thereby converting heat energy into electrical energy and realizing the effective utilization of waste heat in the hot zone.

[0056] Therefore, the power generation device of this utility model embodiment has the following advantages compared with the prior art: First, by adopting a wheel-type circulation structure, the blades 11 are rotated in a circular manner, achieving the alternation of hot and cold ends of the shape memory metal blades 11 without the aid of gravity. Second, by using the driving force generated by the deformation of the blades 11 made of shape memory metal at the junction of the cold and hot zones, thermal energy can be converted into electrical energy. The shape of the blades 11 minimizes force loss and converts more mechanical energy, significantly improving energy recovery efficiency. Third, by using shape memory metal with multi-stage temperature gradient shape changes, the impeller 1 always has sufficient power to drive the shaft 2 to rotate, effectively avoiding slow shape memory metal recovery due to excessively high temperatures, greatly improving energy recovery efficiency.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A power generation device characterized by comprising: include: An impeller, which is sleeved on a rotating shaft, has multiple blades evenly distributed on it, and the blades are shape memory metal blades; The outer casing is disposed around a portion of the impeller. The area enclosed by the outer casing is the hot zone where the impeller is located, and the area not enclosed by the outer casing is the cold zone where the impeller is located. When the blades move from the cold zone to the hot zone, they change from contraction to extension, generating a driving force on the cold zone. The outer casing at the end where the blades enter the hot zone interacts with the outer end of the blades, causing the blades to rotate towards the hot zone under the action of the reaction force. When the blades in the hot zone enter the cold zone, they are cooled and their extension changes to contraction before they re-enter the hot zone, continuously rotating in a cycle.

2. The power generation device according to claim 1, characterized by The rotating shaft has multiple stages of impellers evenly distributed along its length, and the blades of each stage of the impeller have different deformation temperatures. The rotating shaft is selectively driven by one of the impellers to rotate continuously.

3. The power generation device of claim 2, wherein The deformation temperature of the blades of the multi-stage impeller varies stepwise along the axial length of the rotating shaft.

4. The power generation device of claim 2, wherein A sleeve is provided at the center of the impeller, and the sleeve is fitted onto the rotating shaft. The rotating shaft has a hollow center and is provided with multiple first openings. The sleeve of each impeller stage is provided with a second opening corresponding to the first opening. It also includes: a telescopic device, which includes a plurality of telescopic components, each of which is disposed at the first opening of the rotating shaft, and the telescopic component can move into the corresponding first opening and second opening.

5. The power generation device of claim 4, wherein The telescopic device further includes: a temperature sensor for detecting the temperature of the hot zone; and a processor configured to determine, based on the first temperature detected by the temperature sensor, whether the first temperature reaches the deformation temperature of a certain stage of the impeller; if the first temperature reaches the deformation temperature of a certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the rotating shaft to the corresponding first opening and second opening.

6. The power generation device of claim 5, wherein The processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the rotating shaft to its corresponding first opening and second opening; After time t1, if the second temperature detected by the temperature sensor is lower than the deformation temperature of a certain stage of the impeller, the telescopic component corresponding to that stage of the impeller retracts from the first opening and the second opening into the rotating shaft.

7. The power generation device of claim 5, wherein The processor is further configured to: based on the first temperature reaching the deformation temperature of a certain stage of the impeller, the telescopic member corresponding to that stage of the impeller moves from the rotating shaft to its corresponding first opening and second opening; After time t2, the third temperature detected by the temperature sensor reaches the deformation temperature of the impeller of the previous stage. The telescopic component corresponding to the impeller of this stage retracts into the shaft, and the telescopic component corresponding to the impeller of the previous stage moves from the shaft to the corresponding first opening and second opening.

8. The power generation device of claim 2, wherein The multi-stage impeller includes at least a first-stage impeller, a second-stage impeller, and a third-stage impeller. The first-stage impeller has a first deformation temperature T1, the second-stage impeller has a second-stage deformation temperature T2, and the third-stage impeller has a third-stage deformation temperature T3. Among them, T3 > T2 > T1, and the difference between T3 and T2 is equal to the difference between T2 and T1.

9. The power generation device of claim 2, wherein Also includes: A heat insulation plate is disposed between adjacent impellers and is used to separate hot and cold zones.

10. The power generation device of claim 1, wherein The inner wall of the outer shell at the end where the cold zone enters the hot zone has a pushing groove. When the blade enters the pushing groove from the cold zone into the hot zone, it changes from contraction to extension, generating a pushing force on the cold zone. Under the action of the reaction force, the blade rotates towards the hot zone.

11. The power generation device of claim 10, wherein, The sidewall of the pusher groove adjacent to the cold zone is flat, while the sidewall of the pusher groove away from the cold zone and its bottom are curved.

12. The power generation device of claim 1, wherein Also includes: A charging system, wherein one end of the rotating shaft is connected to the charging system for converting the mechanical energy of the impeller into electrical energy.

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