Gravity energy storage power recovery system based on inertia flywheel

Abstract

The utility model discloses a gravity energy storage power recovery system based on an inertia flywheel. The gravity energy storage power recovery system comprises a gravity energy storage system and an inertia flywheel kinetic energy recovery system. A generator motor of the gravity energy storage system is sequentially connected with an energy storage driving clutch, a brake device and a winding drum through a gearbox by utilizing a rotating shaft; the inertia flywheel kinetic energy recovery system clutch is connected with one side of the winding drum, the other side of the winding drum is connected with an inertia flywheel through a fixed gearbox and a stepless gearbox, the inertia flywheel is arranged in a vacuum box, and a vacuum pump is arranged to be connected with the vacuum box. In the process that the gravity energy storage system stops energy storage or energy release, the inertia flywheel kinetic energy recovery system absorbs waste kinetic energy transmitted by the gravity energy storage system and converts the waste kinetic energy into flywheel rotation kinetic energy to be stored; in the starting stage of starting lifting of the weight block and starting of energy release, kinetic energy stored by rotation of the flywheel is released, the rotation kinetic energy stored by the inertia flywheel is transmitted to the weight block to be accelerated to the speed close to the rated running speed, and recycling of the kinetic energy is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gravity energy storage, and in particular relates to a gravity energy storage power recovery system based on an inertial flywheel. Background Art

[0002] At present, gravity energy storage technology is gradually being valued in the field of energy storage worldwide, and demonstration projects of various types of energy storage technology routes have been built or are under construction. Different types of gravity energy storage technologies, whether based on mountain-type or tower-type gravity energy storage, or based on mine-type gravity energy storage technology, all rely on the motor to drive the weight block to achieve vertical movement, increase the potential energy of the weight block for energy storage, and in the energy release stage, reduce the potential energy of the weight block to drive the generator to rotate for energy release and power generation.

[0003] During the startup phase of energy storage or release, the heavy objects in the gravity energy storage system need to be equipped with special equipment, such as using a frequency converter to configure an asynchronous generator to accelerate the running speed of the heavy objects to the rated operating speed.

[0004] During the shutdown stage when the gravity energy storage system's heavy objects are storing or releasing energy, a brake system is generally configured to brake and decelerate the heavy objects, reducing the running speed of the heavy objects from the rated value to a stationary state. Since the brake system is used for braking and the heavy objects have a huge mass, some energy loss will occur during operation. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a gravity energy storage power recovery system based on an inertial flywheel, which can convert the kinetic energy of the gravity energy storage system during the shutdown process at the end of energy storage and energy release into the mechanical energy of the rotation of the inertial flywheel for storage; in the startup phase when energy storage and energy release begin, the mechanical energy stored in the inertial flywheel is released, and the heavy objects in the gravity energy storage system are accelerated from static to close to the rated operating speed, thereby effectively improving the net efficiency of the gravity energy storage system.

[0006] The utility model is realized by the following technical solutions:

[0007] A gravity energy storage power recovery system based on an inertial flywheel, comprising a gravity energy storage system and an inertial flywheel kinetic energy recovery system;

[0008] The gravity energy storage system is used to absorb the surplus power of the power grid when the load demand of the power grid is low. The electric motor is used to lift the vertical height of the weight block. When the load demand of the power grid is high, the weight block is lowered to release the gravity potential energy to drive the generator to generate electricity to supplement the power gap of the power grid. The gravity energy storage system transfers part of the kinetic energy of the weight block to the inertial flywheel kinetic energy recovery system during the shutdown stage when the weight block is lifted and the energy is released.

[0009] The inertial flywheel kinetic energy recovery system is used to absorb the waste kinetic energy transmitted by the gravity energy storage system during the shutdown stage when the gravity energy storage system finishes lifting the heavy block and releasing the energy, and convert it into the mechanical energy of the inertial flywheel rotation for storage; in the startup stage when the heavy block starts to be lifted and the energy release begins, the inertial flywheel mechanical energy is released to accelerate the heavy block to a speed close to the rated operating speed of the heavy block, thereby realizing the reuse of kinetic energy recovery.

[0010] A further improvement of the utility model is that the gravity energy storage system includes a generator motor, an energy storage gearbox, an energy storage drive clutch, a brake device, a drum, a wire rope and a heavy object;

[0011] The generator motor is connected to the energy storage drive clutch, the brake device and the drum in sequence through the energy storage gearbox by means of a rotating shaft; the wire rope is wound around the drum, and the free end of the wire rope is connected to a heavy object.

[0012] A further improvement of the utility model is that the generator motor has a generator function and a motor function at the same time, and can be automatically switched according to the working state of the gravity energy storage system.

[0013] A further improvement of the utility model is that the inertial flywheel kinetic energy recovery system comprises a kinetic energy recovery clutch, a fixed gear ratio gearbox, a continuously variable gearbox, an inertial flywheel, a vacuum pump and a vacuum box;

[0014] One side of the reel is connected to a kinetic energy recovery clutch, a fixed gear ratio gearbox and a continuously variable transmission in sequence by a rotating shaft, and the outlet of the continuously variable transmission is connected to an inertia flywheel; the inertia flywheel is placed in a vacuum box, the vacuum box is connected to the inlet of a vacuum pump through a pipeline, and the outlet of the vacuum pump is connected to the atmospheric environment.

[0015] A further improvement of the utility model is that the continuously variable transmission has a continuously variable speed change function within a set speed change range, and its control system can automatically match the speed ratio according to the reel speed and the inertia flywheel speed.

[0016] A further improvement of the utility model is that both the energy storage drive clutch and the kinetic energy recovery clutch have a bidirectional power transmission function and an interlocking function.

[0017] A further improvement of the utility model lies in that the vacuum pump is a water ring vacuum pump or a Roots vacuum pump.

[0018] A further improvement of the utility model is that the vacuum pump is used to provide a vacuum environment for the vacuum box, thereby reducing the energy loss of the inertial flywheel during the standby operation.

[0019] Compared with the prior art, the utility model has at least the following beneficial technical effects:

[0020] The inertial flywheel kinetic energy recovery system composed of a clutch, a fixed gear ratio gearbox, a continuously variable transmission and a vacuum device is combined with the gravity energy storage system to achieve the goal that when the gravity energy storage system is shut down at the end of the energy storage process and the end of energy release, part of the kinetic energy of the movement of the heavy object is transferred to the inertial flywheel kinetic energy recovery system to store the energy in the form of flywheel rotational kinetic energy, rather than all of it being braked by the brake system and dissipated and wasted in the form of heat.

[0021] Furthermore, the utility model realizes that the gravity energy storage system releases the flywheel rotational kinetic energy stored in the inertial flywheel kinetic energy recovery system at the beginning stage of energy release, that is, the startup stage when the weight block stores and releases energy, so as to accelerate the weight block to a speed close to the rated operating speed of the weight block, thereby realizing the recovery and reuse of kinetic energy, thereby effectively reducing the energy consumption during the startup process of the gravity energy storage system.

[0022] Furthermore, an energy storage drive clutch and kinetic energy recovery clutch with interlocking function are used to achieve close workflow coordination between the inertial flywheel kinetic energy recovery system and the gravity energy storage system in the energy absorption process and the start and end stages of energy release, thereby achieving continuity and stability in system operation.

[0023] Furthermore, a continuously variable transmission is used to enable the inertial flywheel kinetic energy recovery system to maximize the kinetic energy recovery rate of the heavy object block during energy absorption and to minimize the flywheel speed during energy release, thereby effectively improving the overall efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a gravity energy storage inertial flywheel kinetic energy recovery system based on liquid compressed air energy storage described in an example of the utility model.

[0025] Description of reference numerals:

[0026] 1-generator motor, 2-energy storage gearbox, 3-energy storage drive clutch, 4-brake device, 5-reel, 6-wire rope, 7-weight block, 8-kinetic energy recovery clutch, 9-fixed gear ratio gearbox, 10-continuously variable gearbox, 11-inertia flywheel, 12-vacuum pump, 13-vacuum box. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific implementation methods, which are intended to explain the present invention rather than to limit it.

[0028] like Figure 1 As shown, the utility model provides a gravity energy storage power recovery system based on an inertial flywheel, including a gravity energy storage system and an inertial flywheel kinetic energy recovery system.

[0029] Among them, the gravity energy storage system includes a generator motor 1, an energy storage gearbox 2, an energy storage drive clutch 3, a brake device 4, a reel 5, a wire rope 6 and a heavy object 7 and other equipment; the inertial flywheel kinetic energy recovery system includes a kinetic energy recovery clutch 8, a fixed gear ratio gearbox 9, a continuously variable transmission 10, an inertial flywheel 11, a vacuum pump 12 and a vacuum box 13 and other equipment.

[0030] The above-mentioned generator motor 1 has a power generation function and also a motor function; under certain operating conditions, when the energy storage drive clutch 3 is disengaged, the kinetic energy recovery clutch 8 is engaged at the same time, and when the energy storage drive clutch 3 is engaged, the kinetic energy recovery clutch 8 is disengaged at the same time; the continuously variable transmission 10 has a continuously variable speed change function within a set speed range, and its control system can automatically match the speed ratio according to the speed of the reel 5 and the speed of the inertial flywheel 11; the vacuum pump 12 can be a water ring vacuum pump, a Roots vacuum pump or other types of vacuum pumps.

[0031] The connection methods of each device are as follows:

[0032] The generator motor 1 is connected to the energy storage drive clutch 3, the brake device 4, and the drum 5 in sequence through the energy storage gearbox 2 by means of a rotating shaft; the wire rope 6 is wound around the drum 5, and the free end is connected to the heavy object 7;

[0033] One side of the reel 5 is connected with a kinetic energy recovery clutch 8, a fixed gear ratio gearbox 9, and a continuously variable transmission 10 in sequence by a rotating shaft, and the outlet of the continuously variable transmission 10 is connected to an inertial flywheel 11; the inertial flywheel 11 is placed in a vacuum box 13, and the vacuum box 13 is connected to an inlet of a vacuum pump 12 through a pipeline, and the outlet of the vacuum pump 12 is connected to the atmospheric environment.

[0034] The energy absorption working process of the inertial flywheel kinetic energy recovery system is:

[0035] When the weight block 7 of the gravity energy storage system is in the lifting and energy release stage, the energy storage drive clutch 3 is in the engaged state, the kinetic energy recovery clutch 8 is in the disengaged state, the vacuum pump 12 is in the stopped state, the vacuum box 13 is in the negative pressure state, and the inertial flywheel 11 is in the stationary state;

[0036] At the beginning of the shutdown phase when the gravity energy storage system has finished lifting the weight block and releasing the energy, the vacuum pump 12 starts to increase the vacuum degree of the vacuum box 13, the energy storage drive clutch 3 is switched to the disengaged state, and the kinetic energy recovery clutch 8 is switched to the engaged state, and the reel 5 drives the inertia flywheel 11 through the clutch 8, the fixed gear ratio gearbox 9, and the continuously variable gearbox 10 to accelerate;

[0037] As the speed of the inertial flywheel 11 increases, the running speed of the reel 5 and the weight 7 decreases. When the running speed of the reel 5 and the weight 7 exceeds the effective speed range of the continuously variable transmission 10 and cannot drive the inertial flywheel 11 to continue to accelerate, the kinetic energy recovery clutch 8 is disengaged, and the brake device 4 brakes at the same time to stop the reel 5 and the weight 7.

[0038] When the reel 5 and the weight block 7 stop operating, the brake device 4 is in a braking state, the energy storage drive clutch 3 and the kinetic energy recovery clutch 8 are both in a disengaged state, and the vacuum pump 12 is in an operating state.

[0039] The energy release working process of the inertial flywheel kinetic energy recovery system is:

[0040] When the gravity energy storage system weight block 7 is in a static state, the energy storage drive clutch 3 and the kinetic energy recovery clutch 8 are both in a disengaged state, the vacuum pump 12 is in a running state, the vacuum box 13 is maintained in a negative pressure state, and the inertial flywheel 11 is in a rotating running state;

[0041] Before the weight block 7 of the gravity energy storage system is about to store energy or release energy, the brake device 4 is switched to a non-braking state, the kinetic energy recovery clutch 8 is switched to an engaged state, and the inertial flywheel 11 drives the reel 5 to start rotating and accelerating through the continuously variable transmission 10, the fixed gear ratio transmission 9 and the kinetic energy recovery clutch 8, thereby gradually accelerating the weight block 7 to a speed close to the designed operating speed;

[0042] When the inertial flywheel 11 can no longer drive the reel 5 and the heavy object 7 to continue accelerating, the energy storage drive clutch 3 switches to the engaged state, while the kinetic energy recovery clutch 8 switches to the disengaged state, and the generator motor 1 enters the working state to generate electricity or drive the reel 5 to continue working.

[0043] The energy storage drive clutch 3 and the kinetic energy recovery clutch 8 both have a bidirectional power transmission function and an interlocking function. That is, under certain operating conditions, when the energy storage drive clutch 3 is disengaged, the kinetic energy recovery clutch 8 is engaged at the same time, and when the energy storage drive clutch 3 is engaged, the kinetic energy recovery clutch 8 is disengaged at the same time.

[0044] The utility model combines a gravity energy storage system with an inertia flywheel equipped with a continuously variable transmission, so that when the gravity energy storage system stops storing energy or stops releasing energy, the energy storage function of the inertia flywheel energy storage system is started to recover part of the kinetic energy of the weight block during the shutdown process, thereby decelerating the weight block and transferring the running kinetic energy of the weight block to the rotational kinetic energy of the inertia flywheel for storage.

[0045] When the gravity energy storage system starts storing energy or stops releasing energy, the energy release function of the inertial flywheel energy storage system is started to transfer the rotational kinetic energy stored in the inertial flywheel to the weight block for acceleration, and accelerates it to a speed close to the rated operating speed, thereby realizing the reuse of kinetic energy recovery.

[0046] The above description is only a preferred specific implementation method of the utility model, and does not limit the patent scope of the utility model. Any use of the contents of the utility model specification and drawings directly or indirectly in other related technical fields is also included in the patent protection scope of the utility model.

Claims

1. A gravity energy storage power recovery system based on an inertial flywheel, characterized in that: Including gravity energy storage system and inertial flywheel kinetic energy recovery system; The gravity energy storage system comprises a generator motor (1), an energy storage gearbox (2), an energy storage drive clutch (3), a brake device (4), a drum (5), a wire rope (6) and a heavy object (7); the generator motor (1) is connected to the energy storage drive clutch (3), the brake device (4) and the drum (5) in sequence through the energy storage gearbox (2) by means of a rotating shaft; the wire rope (6) is wound around the drum (5), and the free end of the wire rope (6) is connected to the heavy object (7); The inertial flywheel kinetic energy recovery system comprises a kinetic energy recovery clutch (8), a fixed gear ratio gearbox (9), a continuously variable gearbox (10), an inertial flywheel (11), a vacuum pump (12) and a vacuum box (13); one side of the reel (5) is connected to the kinetic energy recovery clutch (8), the fixed gear ratio gearbox (9) and the continuously variable gearbox (10) in sequence by means of a rotating shaft, and the outlet of the continuously variable gearbox (10) is connected to the inertial flywheel (11); the inertial flywheel (11) is placed in the vacuum box (13), the vacuum box (13) is connected to the inlet of the vacuum pump (12) through a pipeline, and the outlet of the vacuum pump (12) is connected to the atmospheric environment.

2. A gravity energy storage power recovery system based on an inertial flywheel according to claim 1, characterized in that: The generator motor (1) has a generator function and a motor function at the same time, and can be automatically switched according to the working state of the gravity energy storage system.

3. The gravity energy storage power recovery system based on inertial flywheel according to claim 1, characterized in that: The continuously variable transmission (10) has a continuously variable speed change function within a set speed change range, and its control system can automatically match the speed ratio according to the speed of the reel (5) and the speed of the inertial flywheel (11).

4. The gravity energy storage power recovery system based on inertial flywheel according to claim 1, characterized in that: The energy storage drive clutch (3) and the kinetic energy recovery clutch (8) both have a bidirectional power transmission function and an interlocking function.

5. The gravity energy storage power recovery system based on inertial flywheel according to claim 1, characterized in that: The vacuum pump (12) is a water ring vacuum pump.

6. The gravity energy storage power recovery system based on inertial flywheel according to claim 1, characterized in that: The vacuum pump (12) is a Roots vacuum pump.

7. The gravity energy storage power recovery system based on inertial flywheel according to claim 1, characterized in that: The vacuum pump (12) is used to provide a vacuum environment for the vacuum box (13) to reduce the energy loss of the inertial flywheel (11) during the standby operation.

Images