An elevator energy recovery system and recovery method

Abstract

The application provides an elevator energy recovery system and a recovery method, and relates to the technical field of elevator energy saving.The elevator energy recovery system comprises a motor, a multi-stage flywheel energy storage device, a speed change mechanism, a mechanical transmission mechanism and a control unit; the motor is connected with a driving wheel through the speed change mechanism; the multi-stage flywheel energy storage device comprises a first flywheel, a second flywheel and a third flywheel; the multi-stage flywheel energy storage device is connected with the driving wheel; in a first linkage state, the first flywheel is used for being connected with the driving wheel through the mechanical transmission mechanism and the speed change mechanism; in a second linkage state, the second flywheel is used for being connected with the driving wheel through the mechanical transmission mechanism and the speed change mechanism; in a third linkage state, the third flywheel is used for being connected with the driving wheel through the mechanical transmission mechanism and the speed change mechanism; and the control unit is electrically connected with the motor and the mechanical transmission mechanism respectively.The elevator energy recovery system can effectively reduce the waste of energy and the operation cost of the elevator, and improve the energy recovery efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elevator energy saving, in particular to an elevator energy recovery system and a recovery method. BACKGROUND

[0002] The elevator is a kind of transport equipment, which is used for transporting passengers and goods quickly and safely in buildings. It is composed of one or more cars, drive systems, control systems, safety devices and shafts. It is widely used in current buildings due to its safety, convenience, comfort, reliability and adaptability. In the running process of the elevator, the motor of the drive system has two operating states, i.e. motor state and generator state. In some elevator operating states, for example, when the elevator starts and accelerates, the motor needs to overcome a certain static friction and resistance to pull the car of the elevator, at this time the motor is in the motor state. When the elevator is descending or decelerating, the motor does not need to provide power, at this time the motor is actually in the generator state. The electric energy generated when the motor is in the generator state needs to be handled in time, otherwise it will cause serious harm to the motor (mainly the electric energy generated by the motor is reversed to the DC end of the frequency converter through the three-phase IGBT inverter bridge of the frequency converter, and is stored in the DC capacitor. Since the storage capacity of the DC capacitor is limited, it may cause the voltage of the DC bus to be too high, thereby causing irreversible damage to the motor).

[0003] At present, in order to avoid the influence of the electric energy generated when the motor is in the generator state on the performance of the motor, two schemes are generally used. The first is to use energy consumption resistance to consume the electric energy and convert it into heat energy, but this also requires a heat exchange or heat dissipation device to be added to the elevator related equipment to ensure that the temperature in the machine room is maintained below a certain threshold. This also increases the energy waste and operating cost of the elevator. The second is to feed back the electric energy to the power grid in real time to realize energy recovery, but since the operating state of the elevator is not stable, the power generation and harmonics are also unstable, which has a great impact on the power grid and the recovery utilization rate is very low.

[0004] Therefore, how to design a new elevator energy recovery scheme to reduce the operating cost and energy waste of the elevator while having a high recovery utilization rate has become a problem to be solved. SUMMARY

[0005] In order to solve the technical problems in the related art, the present application provides an elevator energy recovery system and a recovery method.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application comprises:

[0007] According to a first aspect of the present application, an elevator energy recovery system is provided, comprising a motor, a multi-stage flywheel energy storage device, a variable speed mechanism, a mechanical transmission mechanism and a control unit;

[0008] The motor is connected to the drive wheel of the elevator through the variable speed mechanism, so that the kinetic energy of the motor is transmitted to the drive wheel through the variable speed mechanism;

[0009] The multi-stage flywheel energy storage device comprises a first flywheel, a second flywheel and a third flywheel; wherein the energy storage capacity of the first flywheel is less than that of the second flywheel, and the energy storage capacity of the second flywheel is less than that of the third flywheel; the multi-stage flywheel energy storage device is connected to the drive wheel through the mechanical transmission mechanism and the variable speed mechanism;

[0010] The mechanical transmission mechanism is configured to be able to switch between a first linkage state, a second linkage state and a third linkage state; in the first linkage state, the first flywheel is connected to the drive wheel through the mechanical transmission mechanism and the variable speed mechanism, so that the first flywheel can be used to store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel; in the second linkage state, the second flywheel is connected to the drive wheel through the mechanical transmission mechanism and the variable speed mechanism, so that the second flywheel can store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel; in the third linkage state, the third flywheel is connected to the drive wheel through the mechanical transmission mechanism and the variable speed mechanism, so that the third flywheel can store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel;

[0011] The control unit is electrically connected to the motor and the mechanical transmission mechanism, respectively.

[0012] Optionally, the energy storage capacity of the first flywheel is 0.1 kWh-1 kWh, the energy storage capacity of the second flywheel is 3 kWh-7 kWh, and the energy storage capacity of the third flywheel is 13 kWh-17 kWh.

[0013] Optionally, the mechanical transmission mechanism is provided in any one of the following structures:

[0014] A clutch combination structure with three output ends, a differential structure with three output ends, a solenoid valve and a hydraulic motor structure with three output ends, a mechanical reversing structure with three output ends.

[0015] According to a second aspect of the present application, an elevator energy recovery method is provided, which is applied to the elevator energy recovery system of any one of the technical solutions in the first aspect of the present application, and the elevator energy recovery method comprises the following steps:

[0016] Step S1: the control unit acquires the running data of the motor to identify the current running state of the elevator, which includes the down state, the deceleration state, the start-up and acceleration state, the stop state;

[0017] Step S2: the control unit switches the linkage state of the mechanical transmission mechanism according to the current running state of the elevator;

[0018] When the elevator is in the down state or the deceleration state, the control unit switches the linkage state of the mechanical transmission mechanism according to the energy storage state of the first flywheel, the second flywheel and the third flywheel, so that the mechanical energy of the drive wheel can be stored by the first flywheel, the second flywheel or the third flywheel;

[0019] When the running state of the elevator is the start-up and acceleration state, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert the stored energy into the mechanical energy of the drive wheel;

[0020] When the running state of the elevator is the stop state, the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can convert the stored energy into the mechanical energy of the drive wheel.

[0021] Optionally, in the step S2, when the elevator is in the down state or the deceleration state, and the elevator is in a running low peak period, wherein the running low peak period is the running number of the elevator within a preset time interval is less than the set running number threshold;

[0022] The control unit first switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can be used to store the mechanical energy of the drive wheel;

[0023] When the first flywheel reaches the maximum energy storage state, the control unit switches the mechanical transmission mechanism to the second linkage state, so that the second flywheel can be used to store the mechanical energy of the drive wheel;

[0024] When the second flywheel reaches the maximum energy storage state, the control unit switches the mechanical transmission mechanism to the third linkage state, so that the third flywheel can be used to store the mechanical energy of the drive wheel.

[0025] Optionally, when the elevator is in the down state or the deceleration state, and the elevator is in a running high peak period, wherein the running high peak period is the running number of the elevator within a preset time interval is greater than or equal to the set running number threshold;

[0026] The control unit switches the mechanical transmission structure to the second linkage state or the third linkage state first, so that the second flywheel or the third flywheel can be used to store the mechanical energy of the driving wheel;

[0027] In the process that the elevator switches from the descending state or the decelerating state to the starting and accelerating state through the stopping state, the control unit switches the mechanical transmission structure to the second linkage state or the third linkage state first, so that the energy stored in the second flywheel or the third flywheel can be converted into the mechanical energy of the driving wheel.

[0028] Optionally, in the step S2, when the elevator is in the starting and accelerating state, the current energy storage condition of the first flywheel is obtained;

[0029] If the current energy storage of the first flywheel satisfies: wherein A is a proportional coefficient, is the maximum energy storage capacity of the first flywheel, the control unit switches the mechanical transmission structure to the first linkage state, so that the first flywheel can convert the energy stored therein into the mechanical energy of the driving wheel;

[0030] If the current energy storage of the first flywheel satisfies: the control unit switches the mechanical transmission structure to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can convert the energy stored therein into the mechanical energy of the driving wheel.

[0031] Optionally, when the elevator is in the starting and accelerating state, and the current energy storage of the first flywheel satisfies: the current energy storage condition of the second flywheel is obtained;

[0032] If the current energy storage of the second flywheel satisfies: wherein B is a proportional coefficient, is the maximum energy storage capacity of the second flywheel, the control unit switches the mechanical transmission structure to the second linkage state, so that the second flywheel can convert the energy stored therein into the mechanical energy of the driving wheel;

[0033] If the current energy storage of the second flywheel satisfies: the control unit switches the mechanical transmission structure to the third linkage state, so that the third flywheel can convert the energy stored therein into the mechanical energy of the driving wheel.

[0034] According to a third aspect of the present application, a computer device is further provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the elevator energy recovery method according to any one of the first aspect of the present application.

[0035] According to a fourth aspect of the present application, a computer readable storage medium is further provided, which stores a computer program, wherein the computer program is executable on a processor to implement the steps of the elevator energy recovery method according to any one of the first aspect of the present application.

[0036] Advantages:

[0037] 1. According to the above technical solution, when the motor of the elevator is in the state of a generator, the mechanical energy of the driving wheel can be stored by the multi-stage flywheel energy storage device through the speed change mechanism and the mechanical transmission mechanism, and used by the motor when the motor of the elevator is in the state of a motor. In this way, first, there is no need to set up energy-consuming resistors for energy consumption braking, and there is no need to set up heat exchange or heat dissipation equipment, which can effectively reduce the waste of energy and the operation cost of the elevator. Second, it will not involve the feedback of the computer generated when the motor is in the state of a generator to the power grid, so as not to cause impact on the power grid. Third, the mechanical energy of the driving wheel can be stored by the multi-stage flywheel energy storage device, which not only has high power output characteristics, but also can effectively improve the energy recovery efficiency.

[0038] In addition, since the mechanical energy of the driving wheel can be stably and reliably stored by the multi-stage flywheel energy storage device, and the stored energy can be converted into the mechanical energy of the driving wheel when needed, the multi-stage flywheel energy storage device of the present application not only can be used as an energy recovery device, but also can be used as an auxiliary electric energy supply device and a backup electric energy supply device, which can not only effectively realize efficient energy recovery, but also effectively reduce the energy consumption and operation reliability during the use of the elevator.

[0039] 2. Other advantages or benefits of the present application will be described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Among them:

[0042] Figure 1 is a schematic diagram of an elevator energy recovery system arrangement provided by an example embodiment of the present application, in which an elevator car, counterweight, hoisting rope and drive wheel are also shown;

[0043] Figure 2 is a schematic diagram of a step flow of an elevator energy recovery method provided by an example embodiment of the present application.

[0044] Explanation of reference numerals in the drawings:

[0045] 100 - elevator car; 101 - counterweight; 102 - hoisting rope; 103 - drive wheel; 1 - motor; 2 - multi-stage flywheel energy storage device; 21 - first flywheel; 22 - second flywheel; 23 - third flywheel; 3 - speed change mechanism; 4 - mechanical transmission mechanism. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all of the embodiments of the present application.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative effort based on the embodiments in the present application are within the scope of protection of the present application.

[0048] In addition, the terms "comprising" and "having" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. It should be noted that in the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance or illustration. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0049] It should be noted that the drawings in the present application are only intended to show the specific embodiments of the present application, and thus the shapes of the components in the drawings do not limit the shapes of the components in the embodiments of the present application. Figure 1In addition, the elevator car 100, the counterweight 101, the traction rope 102 and the drive wheel 103 are shown, wherein the elevator car 100 is used to carry people or goods, the counterweight 101 is used to balance the weight of the elevator car 100 and to reduce the fluctuation during the operation of the elevator, and the traction rope 102 is wound around the drive wheel 103 and the two ends thereof are connected to the counterweight 101 and the elevator car 100, respectively.

[0050] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

[0051] Embodiment 1

[0052] As Figure 1 shown, according to the first aspect of the present application, an elevator energy recovery system is provided, comprising a motor 1, a multi-stage flywheel energy storage device 2, a speed change mechanism 3, a mechanical transmission mechanism 4 and a control unit.

[0053] The motor 1 is connected to the drive wheel 103 of the elevator through the speed change mechanism 3, so that the kinetic energy of the motor 1 is transmitted to the drive wheel 103 through the speed change mechanism 3.

[0054] The multi-stage flywheel energy storage device 2 comprises a first flywheel 21, a second flywheel 22 and a third flywheel 23; wherein the energy storage capacity of the first flywheel 21 is less than that of the second flywheel 22, and the energy storage capacity of the second flywheel 22 is less than that of the third flywheel 23; the multi-stage flywheel energy storage device 2 is connected to the drive wheel 103 through the mechanical transmission mechanism 4 and the speed change mechanism 3.

[0055] The mechanical transmission mechanism 4 is configured to be able to switch between a first linkage state, a second linkage state and a third linkage state; in the first linkage state, the first flywheel 21 is connected to the drive wheel 103 through the mechanical transmission mechanism 4 and the speed change mechanism 3, so that the first flywheel 21 can be used to store the mechanical energy of the drive wheel 103, or can convert the stored energy into the mechanical energy of the drive wheel 103; in the second linkage state, the second flywheel 22 is connected to the drive wheel 103 through the mechanical transmission mechanism 4 and the speed change mechanism 3, so that the second flywheel 22 can store the mechanical energy of the drive wheel 103, or can convert the stored energy into the mechanical energy of the drive wheel 103; in the third linkage state, the third flywheel 23 is connected to the drive wheel 103 through the mechanical transmission mechanism 4 and the speed change mechanism 3, so that the third flywheel 23 can store the mechanical energy of the drive wheel 103, or can convert the stored energy into the mechanical energy of the drive wheel 103.

[0056] The control unit is electrically connected to the motor 1 and the mechanical transmission mechanism 4, respectively.

[0057] By the above technical solution, when the motor 1 of the elevator is in the generator 1 state, the mechanical energy of the driving wheel 103 can be stored by the multi-stage flywheel energy storage device 2 through the speed change mechanism 3 and the mechanical transmission mechanism 4, and supplied to the motor 1 when the motor 1 of the elevator is in the motor state. In this way, first, there is no need to set up energy-consuming resistors for energy consumption braking, and there is no need to set up heat exchange or heat dissipation equipment, which can effectively reduce the waste of energy and the operation cost of the elevator. Second, it does not involve the need to feed back the computer generated when the motor 1 is in the generator 1 state to the power grid, so as not to cause impact on the power grid. Third, the mechanical energy of the driving wheel 103 can be stored by the multi-stage flywheel energy storage device 2, which not only has high power output characteristics, but also can effectively improve the energy recovery efficiency.

[0058] In addition, since the mechanical energy of the driving wheel 103 can be stably and reliably stored by the multi-stage flywheel energy storage device 2, and the stored energy can be converted into mechanical energy of the driving wheel 103 when needed, the multi-stage flywheel energy storage device 2 of the present application not only can be used as an energy recovery device, but also can be used as an auxiliary electric energy supply device and a backup electric energy supply device, which can not only effectively realize efficient energy recovery, but also effectively reduce the energy consumption and operation reliability during the use of the elevator.

[0059] It should be particularly noted that in the present application, the multi-stage flywheel energy storage device 2 adopts a three-stage flywheel structure with increasing energy storage capacity, which not only can adapt to the needs of any operating state of the elevator, but also can effectively improve the overall energy storage capacity of the multi-stage flywheel energy storage device 2 and the amount of electric energy provided as a backup electric energy supply device.

[0060] Specifically, the first flywheel 21 provided in the present application has the smallest energy storage capacity, but due to its smallest energy storage capacity, it has the fastest response speed. That is, when the elevator starts and accelerates, the first flywheel 21 with low energy storage capacity and high response speed can quickly release the stored energy to help the elevator start and accelerate. At the same time, the third flywheel 23 provided in the present application has the largest energy storage capacity, and when the elevator is in a stopped state, the driving wheel 103 gradually slows down to a non-rotating state, and a large amount of energy needs to be stored and recovered. Therefore, the third flywheel 23 with high energy storage capacity can meet the energy storage needs of these energies. In addition, the energy storage capacity of the second flywheel 22 is moderate, which can be used as a buffer and adjustment energy storage unit to buffer and adjust when the first flywheel 21 is insufficient or the third flywheel 23 is insufficient, so as to ensure the smooth operation of the elevator energy recovery and energy supply to the elevator.

[0061] In an embodiment of the present application, the first flywheel 21 has a storage capacity of 0.1 kWh-1 kWh, the second flywheel 22 has a storage capacity of 3 kWh-7 kWh, and the third flywheel 23 has a storage capacity of 13 kWh-17 kWh. When the first flywheel 21 has a storage capacity of 0.1 kWh-1 kWh, it has a faster response speed and can help the elevator start and accelerate in time. Meanwhile, the first flywheel 21 with the storage capacity can meet the starting and accelerating requirements of most elevators. When the third flywheel 23 has a storage capacity of 13 kWh-17 kWh, it has a large enough storage capacity to effectively ensure the mechanical energy of the driving wheel 103 during the stopping process of the elevator to be recycled, thereby ensuring the energy recycling efficiency. When the second flywheel 22 has a storage capacity of 3 kWh-7 kWh, it has a large enough buffering capacity to serve as a backup power supply when the first flywheel 21 cannot supply enough power, and to store excess energy when the third flywheel 23 cannot store enough energy.

[0062] It can be understood that in this embodiment, the present application only provides a preferred scheme, and the specific storage capacity of the first flywheel 21, the second flywheel 22, and the third flywheel 23 can be adjusted according to the actual elevator, which is not limited in the present application. For example, in a specific embodiment, the first flywheel 21 can have a storage capacity of 1 kWh, the second flywheel 22 can have a storage capacity of 5 kWh, and the third flywheel 23 can have a storage capacity of 15 kWh.

[0063] In an embodiment of the present application, the mechanical transmission mechanism 4 is provided in any one of the following structures: a three-output clutch combination structure, a three-output differential structure, an electromagnetic valve and a three-output hydraulic motor structure, and a three-output mechanical reversing structure.

[0064] In this embodiment, the above-mentioned transmission structure with three outputs can selectively transmit the mechanical energy of the driving wheel 103 to the first flywheel 21, the second flywheel 22, or the third flywheel 23, so as to selectively store the mechanical energy of the driving wheel 103 in the first flywheel 21, the second flywheel 22, or the third flywheel 23. Similarly, the energy stored in the first flywheel 21, the second flywheel 22, or the third flywheel 23 can be selectively converted into the mechanical energy of the driving wheel 103.

[0065] Specifically, the mechanical transmission mechanism 4 can have various alternative embodiments. For example, in one embodiment, the mechanical transmission mechanism 4 can be configured as a three-output clutch combination structure. That is, a plurality of clutches (which can be dry clutches, wet clutches, or electromagnetic clutches) are combined to control the connection relationship between the main shaft of the transmission mechanism 3 and the three driven shafts in the multi-stage flywheel storage device. Each clutch can be independently engaged or disengaged, thereby selectively transmitting the mechanical energy of the driving wheel 103 to the first flywheel 21, the second flywheel 22, or the third flywheel 23.

[0066] In another embodiment, the mechanical transmission mechanism 4 can be configured as a three-output differential structure. That is, a differential with three outputs is designed using the principle of differential, so that the main shaft of the transmission mechanism 3 can selectively drive the three driven shafts in the multi-stage flywheel storage device.

[0067] In another embodiment, the mechanical transmission mechanism 4 can be configured as an electromagnetic valve and three-output hydraulic motor structure. That is, the main shaft of the transmission mechanism 3 is connected to a hydraulic pump, and the hydraulic oil is selectively flowed to the corresponding hydraulic motor of the different three outputs through the electromagnetic valve, thereby selectively driving the three driven shafts in the multi-stage flywheel storage device.

[0068] In another embodiment, the mechanical transmission mechanism 4 can be configured as a three-output mechanical reversing structure. By using a plurality of switchable gears, different rotation paths are achieved by moving a selection lever or a switching plate.

[0069] It can be understood that the three-output clutch combination structure, the three-output differential structure, the electromagnetic valve and three-output hydraulic motor structure, and the three-output mechanical reversing structure described above are all maturely applied in the related art in the field, and the specific structure and working principle thereof will not be described herein.

[0070] According to a second aspect of the present application, as shown in Figure 2 the elevator energy recovery method is applied to the elevator energy recovery system of any one of the technical solutions of the first aspect of the present application. The elevator energy recovery method comprises the following steps:

[0071] Step S1: The control unit obtains the running data of the motor to identify the current running state of the elevator, which includes the down state, the deceleration state, the start-up and acceleration state, and the stop state.

[0072] Step S2: The control unit switches the linkage state of the mechanical transmission mechanism according to the current running state of the elevator.

[0073] When the elevator is in the descending state or the decelerating state, the control unit switches the linkage state of the mechanical transmission mechanism according to the energy storage states of the first flywheel, the second flywheel and the third flywheel, so that the mechanical energy of the drive wheel can be stored by the first flywheel, the second flywheel or the third flywheel;

[0074] When the running state of the elevator is the starting and accelerating state, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert the stored energy into the mechanical energy of the drive wheel;

[0075] When the running state of the elevator is the stopping state, the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can convert the stored energy into the mechanical energy of the drive wheel.

[0076] In this way, through the elevator energy recovery method, after the control unit identifies the current running state of the elevator through the operation data of the motor, corresponding energy storage or energy release processes can be performed according to different running states of the elevator, so as to realize energy recovery and reuse of the drive wheel, which not only can effectively improve the recovery efficiency of the mechanical energy of the drive wheel, but also is beneficial to reduce the waste of energy and the operation cost of the elevator.

[0077] Specifically, when the elevator is in the descending or decelerating state, the control unit can store the mechanical energy of the drive wheel by switching the linkage state of the mechanical transmission mechanism; wherein, first, when the elevator is in the starting and accelerating state, the first flywheel with the smallest energy storage capacity but the fastest response speed can be used to convert the stored energy into the mechanical energy of the drive wheel, so as to help the elevator start and accelerate more quickly; second, when the elevator is in the stopping state (i.e. the elevator gradually decelerates from the moving state to the stopping state), the mechanical energy of the drive wheel can be stored by the second flywheel or the third flywheel to meet the energy storage needs of this process.

[0078] In this embodiment, it can be understood that the first flywheel provided by the application has the smallest energy storage capacity, but due to the smallest energy storage capacity, the corresponding response speed is the fastest, that is, when the elevator starts and accelerates, the first flywheel with low energy storage capacity and high response speed can quickly release the stored energy to help the elevator start and accelerate. At the same time, the third flywheel provided by the application has the largest energy storage capacity, and when the elevator is in a stop state, the rotation state of the driving wheel gradually slows down to a non-rotation state, and a large amount of energy needs to be stored and recovered. Therefore, the third flywheel with high energy storage capacity can meet the storage needs of these energies. In addition, the energy storage capacity of the second flywheel is moderate, which can be used as a buffer adjustment energy storage unit to buffer and adjust when the first flywheel energy supply is insufficient or the third flywheel storage capacity is insufficient, to ensure the smooth operation of the elevator energy recovery operation and the energy supply operation of the elevator.

[0079] In an embodiment of the application, in step S2 of the application, when the elevator is in a downward state or a deceleration state, and the elevator is in a low peak operation period, wherein the low peak operation period is that the number of operations of the elevator in a preset time interval is less than a set operation threshold; the control unit can first switch the mechanical transmission mechanism to the first linkage state, so that the first flywheel can be used to store the mechanical energy of the driving wheel;

[0080] When the first flywheel reaches the maximum energy storage state, the control unit switches the mechanical transmission mechanism to the second linkage state, so that the second flywheel can be used to store the mechanical energy of the driving wheel;

[0081] When the second flywheel reaches the maximum energy storage state, the control unit switches the mechanical transmission mechanism to the third linkage state, so that the third flywheel can be used to store the mechanical energy of the driving wheel.

[0082] In this way, during the low peak operation period of the elevator, the operation frequency of the elevator is low, and through the above technical solution, first, a gradient energy storage can be formed to ensure that the mechanical energy of the driving wheel can be completely stored by the first flywheel, the second flywheel and the third flywheel in order of energy storage capacity, avoiding energy waste and improving energy recovery rate. Second, the energy storage and energy release functions of the first flywheel can be fully utilized to improve the responsiveness of the elevator start and acceleration state, to adapt to the elevator operation requirements during the low peak operation period.

[0083] In an embodiment of the application, when the elevator is in a downward state or a deceleration state, and the elevator is in a high peak operation period, wherein the high peak operation period is that the number of operations of the elevator in a preset time interval is greater than or equal to a set operation threshold;

[0084] The control unit first switches the mechanical transmission structure to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can be used to store the mechanical energy of the drive wheel; and in the process that the elevator switches from the descending state or the decelerating state to the starting and accelerating state through the stopping state, the control unit first switches the mechanical transmission mechanism to the second linkage state or the third linkage state, so that the energy stored in the second flywheel or the third flywheel can be converted into the mechanical energy of the drive wheel.

[0085] In this way, during the peak period of elevator operation, the elevator needs to be frequently started and stopped, and the energy required to be stored and released in this process is large. Compared with the mode of first using the first flywheel to store and release energy (the first flywheel may not be sufficient to meet the requirements of energy storage and release, and the second flywheel or the third flywheel needs to be used for energy storage or release), the embodiment can meet the energy required to be stored in the process of each start and stop of the elevator and the energy required to be released by the multi-stage flywheel energy storage device, and can effectively improve the operation efficiency of the elevator energy recovery system (without adjusting the linkage state of the mechanical transmission structure).

[0086] In an embodiment of the present application, in step S2 of the present application, when the elevator is in the starting and accelerating state, the current energy storage condition of the first flywheel is obtained;

[0087] If the current energy storage of the first flywheel satisfies: wherein A is a proportional coefficient, is the maximum energy storage capacity of the first flywheel, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert the energy stored therein into the mechanical energy of the drive wheel;

[0088] If the current energy storage of the first flywheel satisfies: the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can convert the energy stored therein into the mechanical energy of the drive wheel.

[0089] In this way, the first flywheel can always have a certain initial energy storage, i.e., the first flywheel is always in a normal rotating state, which can avoid cold start of the first flywheel, thereby reducing energy waste and improving energy recovery rate and utilization efficiency.

[0090] In an embodiment of the present application, when the elevator is in the starting and accelerating state and the current energy storage of the first flywheel satisfies: the current energy storage condition of the second flywheel is obtained;

[0091] if the second flywheel currently stores energy satisfies: wherein B is a proportional coefficient, is the maximum energy storage capacity of the second flywheel, the control unit switches the mechanical transmission mechanism to the second linkage state so that the second flywheel can convert its stored energy into mechanical energy of the driving wheel;

[0092] if the second flywheel currently stores energy satisfies: the control unit switches the mechanical transmission mechanism to the third linkage state so that the third flywheel can convert its stored energy into mechanical energy of the driving wheel.

[0093] In this way, the second flywheel can always have a certain initial stored energy, i.e., the second flywheel is always in a normal rotating state, which can avoid cold start of the second flywheel, thereby reducing waste of energy and improving energy recovery rate and utilization efficiency.

[0094] According to a second aspect of the present application, a computer device is further provided, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor can implement the steps of the elevator energy recovery method in any of the technical solutions of the first aspect of the present application when executing the computer program.

[0095] It can be understood that, in this embodiment, the memory can comprise a volatile memory, such as a random access memory; the memory can also comprise a non-volatile memory, such as a read-only memory, a flash memory, a hard disk or a solid state disk; in addition, the memory can also comprise a combination of the above-mentioned memories. The present application does not make a specific limitation in this regard.

[0096] Similarly, the processor can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof, which can implement or execute the various exemplary logical steps described in combination with the disclosure of the present application. The processor can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessor, etc.

[0097] According to a third aspect of the present application, a computer readable storage medium is further provided, which stores a computer program, and the computer program is executable by a processor to implement the steps of the elevator energy recovery method in any of the technical solutions of the first aspect of the present application.

[0098] In this embodiment, the computer readable storage medium, for example, can be, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a register, a hard disk, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above, or any other medium from which a computer can read instructions. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can be a part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). In this embodiment, the computer readable storage medium can be any tangible medium that contains or stores a program used by or in connection with an instruction execution system, apparatus, or device.

[0099] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An elevator energy recovery system, characterized in that, It includes a motor (1), a multi-stage flywheel energy storage device (2), a speed change mechanism (3), a mechanical transmission mechanism (4), and a control unit; The motor (1) is connected to the drive wheel of the elevator through the speed change mechanism (3) so that the kinetic energy of the motor (1) is transmitted to the drive wheel through the speed change mechanism (3); The multi-stage flywheel energy storage device (2) includes a first flywheel (21), a second flywheel (22), and a third flywheel (23); wherein the energy storage capacity of the first flywheel (21) is smaller than that of the second flywheel (22), and the energy storage capacity of the second flywheel (22) is smaller than that of the third flywheel (23); the multi-stage flywheel energy storage device (2) is connected to the drive wheel through the mechanical transmission mechanism (4) and the speed change mechanism (3); The mechanical transmission mechanism (4) is configured to switch between a first linkage state, a second linkage state, and a third linkage state. In the first linkage state, the first flywheel (21) is connected to the drive wheel via the mechanical transmission mechanism (4) and the speed change mechanism (3), so that the first flywheel (21) can store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel. In the second linkage state, the second flywheel (22) is connected to the drive wheel via the mechanical transmission mechanism (4) and the speed change mechanism (3), so that the second flywheel (22) can store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel. In the third linkage state, the third flywheel (23) is connected to the drive wheel via the mechanical transmission mechanism (4) and the speed change mechanism (3), so that the third flywheel (23) can store the mechanical energy of the drive wheel, or can convert the stored energy into the mechanical energy of the drive wheel. The control unit is electrically connected to the motor (1) and the mechanical transmission mechanism (4) respectively; When the elevator is in the start-up and acceleration state, obtain the current stored energy of the first flywheel; If the first flywheel currently stores energy satisfy: When, where A is the proportionality coefficient, To maximize the energy storage capacity of the first flywheel, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert its stored energy into the mechanical energy of the drive wheel. If the first flywheel currently stores energy satisfy: When the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, the second flywheel or the third flywheel can convert its stored energy into the mechanical energy of the drive wheel. When the elevator is in the start-up and acceleration state, and the first flywheel is currently storing energy satisfy: At that time, obtain the current energy storage status of the second flywheel; If the second flywheel currently stores energy When: , where B is the proportionality coefficient, To maximize the energy storage capacity of the second flywheel, the control unit switches the mechanical transmission mechanism to the second linkage state, so that the second flywheel can convert its stored energy into the mechanical energy of the drive wheel; If the second flywheel currently stores energy satisfy: At this time, the control unit switches the mechanical transmission mechanism to the third linkage state, so that the third flywheel can convert its stored energy into the mechanical energy of the drive wheel.

2. The elevator energy recovery system according to claim 1, characterized in that, The first flywheel (21) has an energy storage capacity of 0.1kWh-1kWh, the second flywheel (22) has an energy storage capacity of 3kWh-7kWh, and the third flywheel (23) has an energy storage capacity of 13kWh-17kWh.

3. The elevator energy recovery system according to claim 1, characterized in that, The mechanical transmission mechanism (4) is configured as any of the following structures: The three-output clutch combination structure, the three-output differential structure, the solenoid valve and the three-output hydraulic motor structure, and the three-output mechanical reversing structure.

4. A method for recovering energy in an elevator, characterized in that, The elevator energy recovery system according to any one of claims 1-3, the elevator energy recovery method includes the following steps: Step S1: The control unit acquires the motor's operating data to identify the elevator's current operating status, which includes the following: downward state, deceleration state, start and acceleration state, and stop state. Step S2: The control unit switches the linkage state of the mechanical transmission mechanism according to the current operating status of the elevator; When the elevator is in a downward or decelerating state, the control unit switches the linkage state of the mechanical transmission mechanism according to the energy storage state of the first flywheel, the second flywheel, and the third flywheel, so that the mechanical energy of the drive wheel can be stored by the first flywheel, the second flywheel, or the third flywheel. When the elevator is in the start-up and acceleration state, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert its stored energy into the mechanical energy of the drive wheel. When the elevator is in a stopped state, the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, so that the second flywheel or the third flywheel can convert its stored energy into the mechanical energy of the drive wheel; In step S2, when the elevator is in the start-up and acceleration state, the current stored energy of the first flywheel is obtained; If the first flywheel currently stores energy When: , where A is the proportionality coefficient, To maximize the energy storage capacity of the first flywheel, the control unit switches the mechanical transmission mechanism to the first linkage state, so that the first flywheel can convert its stored energy into the mechanical energy of the drive wheel. If the first flywheel currently stores energy satisfy: When the control unit switches the mechanical transmission mechanism to the second linkage state or the third linkage state, the second flywheel or the third flywheel can convert its stored energy into the mechanical energy of the drive wheel. When the elevator is in the start-up and acceleration state, and the first flywheel is currently storing energy satisfy: At that time, obtain the current energy storage status of the second flywheel; If the second flywheel currently stores energy satisfy: When, B is the proportionality coefficient, To maximize the energy storage capacity of the second flywheel, the control unit switches the mechanical transmission mechanism to the second linkage state, so that the second flywheel can convert its stored energy into the mechanical energy of the drive wheel; If the second flywheel currently stores energy satisfy: At this time, the control unit switches the mechanical transmission mechanism to the third linkage state, so that the third flywheel can convert its stored energy into the mechanical energy of the drive wheel.

5. The elevator energy recovery method according to claim 4, characterized in that, In step S2, when the elevator is in a downward or decelerating state and the elevator is in a low-peak operating period, the low-peak operating period is when the number of times the elevator runs within a preset time interval is less than a set threshold number of runs. The control unit first switches the mechanical transmission mechanism to the first linkage state so that the first flywheel can be used to store the mechanical energy of the drive wheel; When the first flywheel reaches its maximum energy storage state, the control unit switches the mechanical transmission mechanism to the second linkage state so that the second flywheel can be used to store the mechanical energy of the drive wheel. When the second flywheel reaches its maximum energy storage state, the control unit switches the mechanical transmission mechanism to the third linkage state so that the third flywheel can be used to store the mechanical energy of the drive wheel.

6. The elevator energy recovery method according to claim 4, characterized in that, When the elevator is in a downward or decelerating state, and the elevator is in a peak operating period, wherein the peak operating period is when the number of times the elevator runs within a preset time interval is greater than or equal to a set threshold number of runs; The control unit first switches the mechanical transmission mechanism to a second linkage state or a third linkage state, so that the second flywheel or the third flywheel can be used to store the mechanical energy of the drive wheel; Furthermore, during the process of the elevator switching from a downward or decelerating state to a stopped state and then to a starting or accelerating state, the control unit first switches the mechanical transmission mechanism to a second or third linkage state, so that the energy stored in the second or third flywheel can be converted into the mechanical energy of the drive wheel.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it is able to implement the steps of the elevator energy recovery method according to any one of claims 4-6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it can implement the steps of the elevator energy recovery method according to any one of claims 4-6.

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