WO2015078098A1 - Electricity Generation System Using Weight Potential Energy - Google Patents

Electricity Generation System Using Weight Potential Energy Download PDF

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Publication number
WO2015078098A1
WO2015078098A1 PCT/CN2014/001068 CN2014001068W WO2015078098A1 WO 2015078098 A1 WO2015078098 A1 WO 2015078098A1 CN 2014001068 W CN2014001068 W CN 2014001068W WO 2015078098 A1 WO2015078098 A1 WO 2015078098A1
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Prior art keywords
weight
potential energy
storage device
electricity generation
generation system
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PCT/CN2014/001068
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French (fr)
Inventor
Dianjun LIU
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Liu Dianjun
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Publication of WO2015078098A1 publication Critical patent/WO2015078098A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G3/00—Other motors, e.g. gravity or inertia motors
    • F03G3/087—Gravity or weight motors
    • F03G3/094—Gravity or weight motors specially adapted for potential energy power storage stations; combinations of gravity or weight motors with electric motors or generators

Definitions

  • the present invention relates to an electricity generation system using weight potential energy, in particular to a system which raises a weight to an elevated height using the off-peak electricity at night, and drops the weight successively from the elevated height when the electricity is in peak demand during the day. Thus, a gravitational potential energy is produced to drive a generator to generate electricity.
  • the present invention pertains to a technical field of electricity generation.
  • the energy storage technology for electricity generation in prior art includes: pumped-storage, compressed air energy storage, flywheel energy storage, etc.
  • Pumped-storage technology refers to pumping the water from a lower reservoir to an upper reservoir during an electric off-peak period to convert electric energy into stored potential energy. The water stored in the upper reservoir is released to generate electricity during the peak-load period.
  • the pumped-storage requires specific geological condition and site. Further, due to the excessive land requirement and longer construction period, the pumped-storage is not suitable to standardized construction.
  • the compressed air energy storage technology refers to converting the electric energy into compressed air at night when the power grid load is in an off-peak period, and sealing the compressed air in an abandoned mine, a cave, an oil and gas well, or a newly-built gas tank. The compressed air is released to drive a steam turbine to generate electricity during an electric peak-load period.
  • the low electricity generation efficiency of the compressed air energy storage technology and the high cost hinder its development.
  • the flywheel energy storage technology refers to driving a large flywheel to rotate at high speed when the power grid load is in an off-peak period so as to store high-speed kinetic energy.
  • the high-speed kinetic energy is released when the power grid load is in a peak-load period to drive a generator to generate electricity. Due to the short generation time and the low power output, the flywheel energy storage is not suitable for large-scale application. Electricity generation using battery energy storage also has the low power output and contributes to the environment pollution, so large-scale development is difficult.
  • the object of the present invention is to solve the insufficiency and defects in the existing design principle for generating electricity using weight potential energy.
  • An electricity generation system using weight potential energy which raises a weight to an elevated height using the overnight off-peak electricity, and releases the weight from the elevated height successively during peak energy usage during the day is provided, thereby a gravitational potential energy is produced to drive a generator to generate electricity.
  • the system has the following advantages: higher energy storage density, less land occupation, shorter construction period, no specific geographical environment requirement and longer utilization. Therefore, the system enables high power and large scale development.
  • the electricity generation system using weight potential energy plays an important role in smoothing the demand fluctuation of the power grid.
  • an electricity generation system using weight potential energy includes a generator and a weight driving device used for driving the generator, wherein the weight driving device includes a stand, a first weight storage device disposed on the stand, and a potential-to-kinetic energy conversion device.
  • the potential energy of the weight is converted into the kinetic energy by the conversion device when the weight descends from the first storage device successively to drive the generator to generate electricity. .
  • the potential-to-kinetic energy conversion device includes: a first sprocket wheel 2 disposed on a stand 8, a second sprocket wheel 6 disposed on the ground, a first chain 7 connecting the first sprocket wheel 2 with the second sprocket wheel 6, and a first metal ball storage device disposed on the stand.
  • Trays 10 for receiving a plurality of weights are disposed on the first chain 7 uniformly.
  • the first sprocket wheel 2 and the second sprocket wheel 6 are driven to rotate when the weights are dropped into the trays on the first chain successively.
  • a rotor of the generator is driven by a power output shaft of the first sprocket wheel 2 or the second sprocket wheel 6.
  • the electricity generation system using weight potential energy further includes a weight lifting device.
  • the weight lifting device comprises an electric-to-potential energy conversion device and a second weight storage device disposed on the ground.
  • the weight stored in the second storage device is put into the first storage device by the electric-to-potential energy conversion device.
  • the electric-to-potential energy conversion device includes a third sprocket wheel 13 disposed on a stand, a fourth sprocket wheel 15 disposed on the ground, a second chain 16 connecting the third sprocket wheel with the fourth sprocket wheel 15, and an electromotor 14 used for driving the fourth sprocket wheel 15 to rotate.
  • Trays for receiving a plurality of weights are disposed on the second chain 16 uniformly.
  • the fourth sprocket wheel 15 is driven to rotate by the electromotor 14 so as to drive the second chain to move upward, the weights on its tray are transported to an elevated height and stored in the first storage device.
  • the first storage device and the second storage device are in the shape of a spiral rail, in which the end receiving the metal balls is higher than the end throwing the metal balls.
  • the electricity generation system using weight potential energy can convert a potential energy produced by dropping the weight from an elevated height into a kinetic energy, and raise the weight to an elevated height using the overnight off-peak electricity, and drop down the weight from the elevated height successively during peak energy periods during the day, thereby a kinetic energy is produced to drive the generator to generate electricity.
  • the system has the following advantages: higher energy storage density, less land occupation, shorter construction period, no specific geographical environment requirement and longer utilization. Therefore, the system enables high power and large scale development.
  • the electricity generation system using weight potential energy plays an important role in smoothing the demand fluctuation of the power grid.
  • FIG. 1 is a schematic diagram of an electricity generation system using weight potential energy in accordance with one embodiment of the present invention.
  • FIG. 2 is a schematic diagram viewed from the A perspective of FIG. 1 in accordance with one embodiment of the present invention.
  • FIG. 1 is a schematic diagram of an electricity generation system using weight potential energy provided by the present invention.
  • FIG. 2 is a schematic diagram viewed from the A perspective of FIG. 1 provided by the present invention.
  • the electricity generation system using weight potential energy provided by the present invention includes a generator and a weight driving device used for driving the generator.
  • the weight driving device includes a stand 21, a first weight storage device 19 disposed on the stand, and a potential-to-kinetic energy conversion device.
  • the potential energy is converted into the kinetic energy by the potential-to-kinetic energy conversion device when the weight is dropped from the first storage device successively so as to drive the generator to generate electricity.
  • the weight is preferably a metal ball.
  • the potential-to-kinetic energy conversion device includes a stand 8; a first sprocket wheel 2 disposed on the stand 8 via a bearing bushing seat 1; a second sprocket wheel 6 disposed on the ground via the bearing bushing seat; a first chain 7 connecting the first sprocket wheel 2 with the second sprocket wheel 6; a guiding rail 9 installed on the stand 8 and disposed at a side of the first chain 7, used for guiding a tray 8 bearing the weight balls, a first metal ball storage device 19 disposed on the stand 21.
  • the trays 10 for receiving a plurality of metal balls are disposed on the first chain 7 uniformly.
  • the first sprocket wheel 2 and the second sprocket wheel 6 are driven to rotate so as to convert the potential energy of the weights into the kinetic energy when the metal balls are dropped into the tray on the first chain.
  • the first sprocket wheel 2 or the second sprocket wheel 6 is provided with a power output draft which is connected with a low-speed input draft of a speed-increasing gearbox 3 via a coupling.
  • a flywheel 4 is installed on a high-speed output draft of the speed-increasing gearbox 3 and plays roles in stabilizing speed and storing energy.
  • the power output shaft of flywheel 4 is connected with the rotor of the generator 5.
  • the electricity generation system using weight potential energy further includes a weight lifting device.
  • the weight lifting device comprises an electric-to-potential energy conversion device and a second weight storage device 21 disposed on the ground.
  • the weight stored in the second storage device is put into the first storage device by the electric-to-potential energy conversion device.
  • the electric-to-potential energy conversion device includes a stand 29, a third sprocket wheel 13 disposed on the stand 29 via a bearing bushing seat 12, a fourth sprocket wheel 15 disposed on the ground via the bearing bushing seat, a second chain 16 connecting the third sprocket wheel with the fourth sprocket wheel 15, and an electromotor 14 used for driving the fourth sprocket wheel 15 to rotate.
  • the trays 17 for receiving a plurality of metal balls are disposed on the second chain 16 uniformly.
  • the fourth sprocket wheel 15 is driven to rotate by the electromotor 14 so as to drive the second chain to move, the metal balls on its trays are transported to an elevated height and stored in the first storage device 19.
  • the stand 8, the stand 21 and the stand 29 can be one stand or a ground located at a high elevation.
  • the first storage device 19 and the second storage device 21 are in the shape of a spiral rail, in which the end receiving the metal balls is higher than the other end throwing the metal balls.
  • the lower end of the second sprocket wheel 6 directly facing the bottom of the first chain is provided with a sphere sliding rail.
  • One end of the sliding rail is disposed beneath the first chain and the other end is connected with a sphere receiving opening of the second storage device which is in the shape of a spiral rail.
  • the end disposed beneath the first chain is higher than the end connected with the second storage device.
  • the end of the sphere receiving opening of the second storage device which is in the shape of a spiral rail is higher than the end of a sphere throwing opening.
  • the end of the sphere throwing opening is provided with a block plate 25.
  • the power-output shaft of a servo motor 23 is connected with an eccentric wheel. Said eccentric wheel is provided beneath the front end of the block plate 25.
  • the operating state of the servo motor is controlled by an optoelectronic switch 28.
  • the end of a sphere receiving opening of the first storage device is disposed beside the third sprocket wheel and the end of a sphere throwing opening thereof is disposed beside the first sprocket wheel.
  • the end of the sphere throwing opening is provided with a block plate 26.
  • the power-output shaft of a servo motor 24 is provided with an eccentric wheel.
  • the eccentric wheel is provided beneath the front end of the block plate 25.
  • the operating state of the servo motor 24 is controlled by an optoelectronic switch 27.
  • the servo motors 23 and 24 are controlled through the controller 22 by the optoelectronic switch 28 and optoelectronic switch 27, respectively.
  • the working process of the power device using weight potential energy of the present invention is described as follows: the electromotor 14 is turned on when the electricity utilization is in an off-peak state at night, and the sprocket wheel 15 is driven to rotate by the electromotor 14, then the second chain 16 engaged with the sprocket wheel 15 is moving upward; the first tray on the second chain 16 is departing from a predefined position and moving upward, then the optoelectronic switch 28 is switched on, and the servo motor 23 drives the eccentric wheel on the power-output shaft to rotate so as to make the block plate moving downward, thereby one ball in the second storage device is thrown into the first tray. Next, the second tray passes into the predefined position, and then the optoelectronic switch 28 is switched off.
  • the servo motor 23 drives the eccentric wheel connected to the power-output shaft thereof to rotate so as to make the block plate moving upward, thereby the ball is blocked. Above process is repeated, such that when the balls in the second storage are transported to the top of the sprocket wheel 13 successively, the balls drop down with its own gravity and fall into the sphere receiving opening of the first storage device 19. In this way, the electric energy can be stored in the form of weight potential energy.
  • the servo motor 24 When the electricity is in peak demand during the day, the servo motor 24 is turned on to drive the eccentric wheel connected to its power-output shaft to rotate. As a result, the block plate moves downward.
  • One ball in the first storage device 19 is thrown into the first tray in the first chain. Due to the own gravity of the ball, the first chain is driven to move down by the ball, so that the first sprocket wheel and the second sprocket wheel are driven to rotate by the first chain. Meanwhile, the optoelectronic switch 28 is switched on.
  • the servo motor 24 drives the eccentric wheel disposed on its power-output shaft to rotate continually so that the block plate is driven to move upward and the second ball in the first storage device 19 is blocked.
  • the second tray on the first chain causes the optoelectronic switch 28 to switch off.
  • the servo motor 24 drives the eccentric wheel disposed on its power-output shaft to rotate continually so that the block plate is driven to continue moving downward and the second ball in the first storage device 19 drops into the second tray in the first chain. Due to the own gravity of the ball, the first chain is driven to move down by the ball, so that the first sprocket wheel and the second sprocket wheel are driven to rotate by the first chain. Above process is repeated, so that when the first sprocket wheel and the second sprocket wheel are rotating, the power-output shafts disposed on which are driven to rotate.
  • the low-speed input shaft of the speed-increasing gearbox 3 is driven to rotate by the power-output shaft.
  • the high-speed input shaft of the speed-increasing gearbox 3 is rotating so as to drive the flywheel 4 to rotate.
  • the rotor of the generator 5 is driven to rotate by the power-output shaft of the flywheel 4 such that the generator is driven to output electric energy.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

An electricity generation system using weight potential energy includes a generator and a weight driving device used for driving the generator. The weight driving device includes a stand (21), a first weight storage device (19) disposed on the stand (21), and a potential-to-kinetic energy conversion device. The potential energy of the weight is converted into the kinetic energy by the potential-to-kinetic energy conversion device when the weight is dropping down from the first storage device so as to drive the generator to generate electricity. The electricity generation system using weight potential energy stores the off-peak electricity in the form of weight potential energy, and has higher energy storage density, less land occupation and shorter construction period.

Description

Electricity Generation System Using Weight Potential Energy
FIELD OF TECHNOLOGY
The present invention relates to an electricity generation system using weight potential energy, in particular to a system which raises a weight to an elevated height using the off-peak electricity at night, and drops the weight successively from the elevated height when the electricity is in peak demand during the day. Thus, a gravitational potential energy is produced to drive a generator to generate electricity. The present invention pertains to a technical field of electricity generation.
BACKGROUND
The energy storage technology for electricity generation in prior art includes: pumped-storage, compressed air energy storage, flywheel energy storage, etc. Pumped-storage technology refers to pumping the water from a lower reservoir to an upper reservoir during an electric off-peak period to convert electric energy into stored potential energy. The water stored in the upper reservoir is released to generate electricity during the peak-load period. The pumped-storage requires specific geological condition and site. Further, due to the excessive land requirement and longer construction period, the pumped-storage is not suitable to standardized construction. The compressed air energy storage technology refers to converting the electric energy into compressed air at night when the power grid load is in an off-peak period, and sealing the compressed air in an abandoned mine, a cave, an oil and gas well, or a newly-built gas tank. The compressed air is released to drive a steam turbine to generate electricity during an electric peak-load period. However, the low electricity generation efficiency of the compressed air energy storage technology and the high cost hinder its development.
The flywheel energy storage technology refers to driving a large flywheel to rotate at high speed when the power grid load is in an off-peak period so as to store high-speed kinetic energy. The high-speed kinetic energy is released when the power grid load is in a peak-load period to drive a generator to generate electricity. Due to the short generation time and the low power output, the flywheel energy storage is not suitable for large-scale application. Electricity generation using battery energy storage  also has the low power output and contributes to the environment pollution, so large-scale development is difficult.
SUMMARY
The object of the present invention is to solve the insufficiency and defects in the existing design principle for generating electricity using weight potential energy. An electricity generation system using weight potential energy which raises a weight to an elevated height using the overnight off-peak electricity, and releases the weight from the elevated height successively during peak energy usage during the day is provided, thereby a gravitational potential energy is produced to drive a generator to generate electricity. The system has the following advantages: higher energy storage density, less land occupation, shorter construction period, no specific geographical environment requirement and longer utilization. Therefore, the system enables high power and large scale development. The electricity generation system using weight potential energy plays an important role in smoothing the demand fluctuation of the power grid.
To achieve the object of the invention, an electricity generation system using weight potential energy is provided. The system includes a generator and a weight driving device used for driving the generator, wherein the weight driving device includes a stand, a first weight storage device disposed on the stand, and a potential-to-kinetic energy conversion device. The potential energy of the weight is converted into the kinetic energy by the conversion device when the weight descends from the first storage device successively to drive the generator to generate electricity. .
Wherein, the potential-to-kinetic energy conversion device includes: a first sprocket wheel 2 disposed on a stand 8, a second sprocket wheel 6 disposed on the ground, a first chain 7 connecting the first sprocket wheel 2 with the second sprocket wheel 6, and a first metal ball storage device disposed on the stand. Trays 10 for receiving a plurality of weights are disposed on the first chain 7 uniformly. The first sprocket wheel 2 and the second sprocket wheel 6 are driven to rotate when the weights are dropped into the trays on the first chain successively. A rotor of the generator is driven by a power output shaft of the first sprocket wheel 2 or the second sprocket wheel 6.
Preferably, the electricity generation system using weight potential energy further includes a weight lifting device. The weight lifting device comprises an electric-to-potential energy conversion device and a second weight storage device disposed on the ground. The weight stored in the second storage device is put into the first storage device by the electric-to-potential energy conversion device.
Wherein, the electric-to-potential energy conversion device includes a third sprocket wheel 13 disposed on a stand, a fourth sprocket wheel 15 disposed on the ground, a second chain 16 connecting the third sprocket wheel with the fourth sprocket wheel 15, and an electromotor 14 used for driving the fourth sprocket wheel 15 to rotate. Trays for receiving a plurality of weights are disposed on the second chain 16 uniformly. As the fourth sprocket wheel 15 is driven to rotate by the electromotor 14 so as to drive the second chain to move upward, the weights on its tray are transported to an elevated height and stored in the first storage device.
Preferably, the first storage device and the second storage device are in the shape of a spiral rail, in which the end receiving the metal balls is higher than the end throwing the metal balls.
Compared to the existing technology, the electricity generation system using weight potential energy provided by the present invention can convert a potential energy produced by dropping the weight from an elevated height into a kinetic energy, and raise the weight to an elevated height using the overnight off-peak electricity, and drop down the weight from the elevated height successively during peak energy periods during the day, thereby a kinetic energy is produced to drive the generator to generate electricity. The system has the following advantages: higher energy storage density, less land occupation, shorter construction period, no specific geographical environment requirement and longer utilization. Therefore, the system enables high power and large scale development. The electricity generation system using weight potential energy plays an important role in smoothing the demand fluctuation of the power grid.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of an electricity generation system using weight potential energy in accordance with one embodiment of the present invention； and
FIG. 2 is a schematic diagram viewed from the A perspective of FIG. 1 in  accordance with one embodiment of the present invention.
DETAILED DESCRIPTION
The present invention will now be described in fully detail hereinafter with reference to the accompanying drawings. Like reference numerals refer to like elements throughout.
FIG. 1 is a schematic diagram of an electricity generation system using weight potential energy provided by the present invention. FIG. 2 is a schematic diagram viewed from the A perspective of FIG. 1 provided by the present invention. As shown in FIGS. 1 and 2, the electricity generation system using weight potential energy provided by the present invention includes a generator and a weight driving device used for driving the generator. The weight driving device includes a stand 21, a first weight storage device 19 disposed on the stand, and a potential-to-kinetic energy conversion device. The potential energy is converted into the kinetic energy by the potential-to-kinetic energy conversion device when the weight is dropped from the first storage device successively so as to drive the generator to generate electricity. The weight is preferably a metal ball. The potential-to-kinetic energy conversion device includes a stand 8； a first sprocket wheel 2 disposed on the stand 8 via a bearing bushing seat 1； a second sprocket wheel 6 disposed on the ground via the bearing bushing seat； a first chain 7 connecting the first sprocket wheel 2 with the second sprocket wheel 6； a guiding rail 9 installed on the stand 8 and disposed at a side of the first chain 7, used for guiding a tray 8 bearing the weight balls, a first metal ball storage device 19 disposed on the stand 21. The trays 10 for receiving a plurality of metal balls are disposed on the first chain 7 uniformly. The first sprocket wheel 2 and the second sprocket wheel 6 are driven to rotate so as to convert the potential energy of the weights into the kinetic energy when the metal balls are dropped into the tray on the first chain. The first sprocket wheel 2 or the second sprocket wheel 6 is provided with a power output draft which is connected with a low-speed input draft of a speed-increasing gearbox 3 via a coupling. A flywheel 4 is installed on a high-speed output draft of the speed-increasing gearbox 3 and plays roles in stabilizing speed and storing energy. The power output shaft of flywheel 4 is connected with the rotor of the generator 5.
The electricity generation system using weight potential energy further includes  a weight lifting device. The weight lifting device comprises an electric-to-potential energy conversion device and a second weight storage device 21 disposed on the ground. The weight stored in the second storage device is put into the first storage device by the electric-to-potential energy conversion device. The electric-to-potential energy conversion device includes a stand 29, a third sprocket wheel 13 disposed on the stand 29 via a bearing bushing seat 12, a fourth sprocket wheel 15 disposed on the ground via the bearing bushing seat, a second chain 16 connecting the third sprocket wheel with the fourth sprocket wheel 15, and an electromotor 14 used for driving the fourth sprocket wheel 15 to rotate. The trays 17 for receiving a plurality of metal balls are disposed on the second chain 16 uniformly. As the fourth sprocket wheel 15 is driven to rotate by the electromotor 14 so as to drive the second chain to move, the metal balls on its trays are transported to an elevated height and stored in the first storage device 19. The stand 8, the stand 21 and the stand 29 can be one stand or a ground located at a high elevation.
The first storage device 19 and the second storage device 21 are in the shape of a spiral rail, in which the end receiving the metal balls is higher than the other end throwing the metal balls. The lower end of the second sprocket wheel 6 directly facing the bottom of the first chain is provided with a sphere sliding rail. One end of the sliding rail is disposed beneath the first chain and the other end is connected with a sphere receiving opening of the second storage device which is in the shape of a spiral rail. The end disposed beneath the first chain is higher than the end connected with the second storage device. The end of the sphere receiving opening of the second storage device which is in the shape of a spiral rail is higher than the end of a sphere throwing opening. The end of the sphere throwing opening is provided with a block plate 25. _The power-output shaft of a servo motor 23 is connected with an eccentric wheel. Said eccentric wheel is provided beneath the front end of the block plate 25. The operating state of the servo motor is controlled by an optoelectronic switch 28. The end of a sphere receiving opening of the first storage device is disposed beside the third sprocket wheel and the end of a sphere throwing opening thereof is disposed beside the first sprocket wheel. The end of the sphere throwing opening is provided with a block plate 26. The power-output shaft of a servo motor 24 is provided with an eccentric wheel. The eccentric wheel is provided beneath the front end of the block plate 25. The operating state of the servo motor 24 is controlled by an optoelectronic  switch 27. The servo motors 23 and 24 are controlled through the controller 22 by the optoelectronic switch 28 and optoelectronic switch 27, respectively.
The working process of the power device using weight potential energy of the present invention is described as follows: the electromotor 14 is turned on when the electricity utilization is in an off-peak state at night, and the sprocket wheel 15 is driven to rotate by the electromotor 14, then the second chain 16 engaged with the sprocket wheel 15 is moving upward； the first tray on the second chain 16 is departing from a predefined position and moving upward, then the optoelectronic switch 28 is switched on, and the servo motor 23 drives the eccentric wheel on the power-output shaft to rotate so as to make the block plate moving downward, thereby one ball in the second storage device is thrown into the first tray. Next, the second tray passes into the predefined position, and then the optoelectronic switch 28 is switched off. The servo motor 23 drives the eccentric wheel connected to the power-output shaft thereof to rotate so as to make the block plate moving upward, thereby the ball is blocked. Above process is repeated, such that when the balls in the second storage are transported to the top of the sprocket wheel 13 successively, the balls drop down with its own gravity and fall into the sphere receiving opening of the first storage device 19. In this way, the electric energy can be stored in the form of weight potential energy.
When the electricity is in peak demand during the day, the servo motor 24 is turned on to drive the eccentric wheel connected to its power-output shaft to rotate. As a result, the block plate moves downward. One ball in the first storage device 19 is thrown into the first tray in the first chain. Due to the own gravity of the ball, the first chain is driven to move down by the ball, so that the first sprocket wheel and the second sprocket wheel are driven to rotate by the first chain. Meanwhile, the optoelectronic switch 28 is switched on. The servo motor 24 drives the eccentric wheel disposed on its power-output shaft to rotate continually so that the block plate is driven to move upward and the second ball in the first storage device 19 is blocked. After the first ball moves a distance downward, the second tray on the first chain causes the optoelectronic switch 28 to switch off. The servo motor 24 drives the eccentric wheel disposed on its power-output shaft to rotate continually so that the block plate is driven to continue moving downward and the second ball in the first storage device 19 drops into the second tray in the first chain. Due to the own gravity of the ball, the first chain is driven to move down by the ball, so that the first sprocket  wheel and the second sprocket wheel are driven to rotate by the first chain. Above process is repeated, so that when the first sprocket wheel and the second sprocket wheel are rotating, the power-output shafts disposed on which are driven to rotate. The low-speed input shaft of the speed-increasing gearbox 3 is driven to rotate by the power-output shaft. The high-speed input shaft of the speed-increasing gearbox 3 is rotating so as to drive the flywheel 4 to rotate. The rotor of the generator 5 is driven to rotate by the power-output shaft of the flywheel 4 such that the generator is driven to output electric energy.
The working principle of the present invention has been described above in details by combining with the accompanying drawings. However, the specific embodiment is used to illustrate the present invention exemplarily. The specification is only used to explain the claims. The scope of the present invention is not limited to the specification. The modification and replacement easily thought of by any skilled in the art within the technical scope disclosed in the present invention should fall within the scope of the present invention. Therefore, the scope of the present invention should be limited by the scope of the claims.

Claims (3)

  1. An electricity generation system using weight potential energy including an generator and a weight driving device used for driving the generator, characterized in that,
    the weight driving device includes a stand, a first weight storage device disposed on the stand, and a potential-to-kinetic energy conversion device, wherein the potential energy of the weight is converted into the kinetic energy by the potential-to-kinetic energy conversion device when the weight is dropped down from the first storage device successively to drive the generator to generate electricity.
  2. The electricity generation system using weight potential energy according to claim 1, characterized in that,
    the electricity generation system using weight potential energy further includes a weight lifting device, wherein the weight lifting device comprises a electric-to-potential energy conversion device and a second weight storage device disposed on the ground, wherein the weight stored in the second storage device is put into the first storage device by the electric-to-potential energy conversion device.
  3. The electricity generation system using weight potential energy according to claim 2, characterized in that,
    the first storage device and the second storage device are in a spiral rail shape, in which the end receiving the metal balls is higher than the other end throwing the metal balls.
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