Elevator energy recovery system and recovery method

Abstract

The invention provides an elevator energy recovery system and method, and relates to the technical field of elevator energy conservation, and 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 the driving wheel through a 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 the first linkage state, the first flywheel is used for being connected with a driving wheel through the mechanical transmission mechanism and the speed change mechanism; in the 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 the 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; the control unit is electrically connected with the motor and the mechanical transmission mechanism. According to the elevator energy recovery system, energy waste and elevator operation cost can be effectively reduced, and the energy recovery efficiency is improved.

Description

Technical Field

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

[0002] An elevator is a type of transportation equipment used to transport passengers and goods quickly and safely within a building. It consists of one or more cars, a drive system, a control system, a safety device, and a hoistway. It is widely used in current buildings because of its many advantages, such as safety, convenience, comfort, reliability, and adaptability. During the operation of the elevator, the motor of its drive system has two operating states, namely, the motor state and the 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 elevator car. At this time, the motor is in the motor state; when the elevator is in the downward or deceleration state, the motor does not need to provide power. At this time, the motor is actually in the generator state. The electric energy generated by the motor when it is in the generator state needs to be processed in time, otherwise it will cause serious damage to the motor (mainly because the electric energy generated by the motor is reversed back to the DC end of the frequency converter through the three-phase IGBT inverter bridge of the inverter and 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 prevent the electric energy generated by the motor in the generator state from affecting the performance of the motor, there are generally two solutions adopted. The first is to use energy-consuming resistors for energy-consuming braking to convert this part of the electric energy into heat energy for dissipation. However, this also requires the addition of a heat exchange or heat dissipation device to the elevator-related equipment to ensure that the temperature in the machine room is maintained below a certain threshold, which increases energy waste and the operating cost of the elevator. The second is to feed this part of the electric energy back to the power grid in real time to achieve energy recovery. However, since the operating state of the elevator is not stable, its power generation power and harmonics are unstable, which has a greater impact on the power grid and the recovery rate is very low.

[0004] Therefore, how to design a new elevator energy recovery solution that can reduce the operating cost and energy waste of the elevator while also having a high recycling rate has become an urgent problem to be solved. Summary of the invention

[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 objectives, the technical solutions adopted in this application include:

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

[0008] The motor is used to connect with the driving wheel of the elevator through the speed change mechanism, so that the kinetic energy of the motor is transmitted to the driving wheel through the speed change 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 smaller than the energy storage capacity of the second flywheel, and the energy storage capacity of the second flywheel is smaller than the energy storage capacity of the third flywheel; the multi-stage flywheel energy storage device is connected to the driving wheel through the mechanical transmission mechanism and the speed change mechanism;

[0010] The mechanical transmission mechanism is configured to be switchable between a first linkage state, a second linkage state and a third linkage state; in the first linkage state, the first flywheel is used to connect with the drive wheel through the mechanical transmission mechanism and the speed change mechanism, so that the first flywheel can be used to store the mechanical energy of the drive wheel, or can convert its stored energy into the mechanical energy of the drive wheel; in the second linkage state, the second flywheel is used to connect with the drive wheel through the mechanical transmission mechanism and the speed change mechanism, so that the second flywheel can store the mechanical energy of the drive wheel, or can convert its stored energy into the mechanical energy of the drive wheel; in the third linkage state, the third flywheel is used to connect with the drive wheel through the mechanical transmission mechanism and the speed change mechanism, so that the third flywheel can store the mechanical energy of the drive wheel, or can convert its 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 0.1kWh-1kWh, the energy storage capacity of the second flywheel is 3kWh-7kWh, and the energy storage capacity of the third flywheel is 13kWh-17kWh.

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

[0014] A clutch combination structure at three output ends, a differential structure at three output ends, a solenoid valve and a hydraulic motor structure at three output ends, and a mechanical reversing structure at 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 described in any technical solution in the first aspect of the present application, and the elevator energy recovery method comprises the following steps:

[0016] Step S1: The control unit obtains the operation data of the motor to identify the current operation state of the elevator, wherein the current operation state of the elevator includes a downward state, a deceleration state, a start and acceleration state, and a stop state;

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

[0018] Wherein, when the elevator is in a downward state or a 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 driving wheel can be stored by the first flywheel, the second flywheel or the third flywheel;

[0019] When the elevator is in 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 its stored energy into the mechanical energy of the driving wheel;

[0020] When the elevator is in a stopped state, the control unit 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 convert its stored energy into mechanical energy of the driving wheel.

[0021] Optionally, in step S2, 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 when the number of operations of the elevator within a preset time interval is less than a set operation number threshold;

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

[0025] Optionally, when the elevator is in a downward state or a decelerating state, and the elevator is in a peak operation period, wherein the peak operation period is when the number of operations of the elevator within a preset time interval is greater than or equal to a set operation number threshold;

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

[0027] Furthermore, in the process of the elevator switching from a downward state or a deceleration state to a stop state to a starting and acceleration 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 mechanical energy of the drive wheel.

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

[0029] If the first flywheel currently stores energy satisfy: When, A is the proportionality 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 its stored energy into the mechanical energy of the driving wheel;

[0030] 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 driving wheel.

[0031] Optionally, when the elevator is in the starting and accelerating state, and the first flywheel currently stores energy satisfy: , obtain the current storage energy of the second flywheel;

[0032] If the second flywheel currently stores energy satisfy: When, B is the proportionality 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 the mechanical energy of the driving wheel;

[0033] If the second flywheel currently stores energy satisfy: When the control unit switches the mechanical transmission mechanism to the third linkage state, the third flywheel can convert its stored energy into the mechanical energy of the driving wheel.

[0034] According to the third aspect of the present application, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the elevator energy recovery method described in any one of the technical solutions in the first aspect of the present application can be implemented.

[0035] According to the fourth aspect of the present application, a computer-readable storage medium is also provided, on which a computer program is stored, characterized in that when the computer program is executed by a processor, it can implement the steps of the elevator energy recovery method described in any technical solution in the first aspect of the present application.

[0036] Beneficial effects:

[0037] 1. Through the above technical solution, when the elevator motor is in the generator state, the mechanical energy of the drive wheel can be stored through the multi-stage flywheel energy storage device through the speed change mechanism and the mechanical transmission mechanism, and supplied to the motor when the elevator motor is in the motor state. In this way, first, there is no need to set up energy-consuming resistors for energy-consuming braking, and there is no need to set up heat exchange or heat dissipation equipment, which can effectively reduce energy waste and elevator operating costs. Second, it does not involve the need to feed back the computer generated when the motor is in the generator state to the power grid, so it will not cause an impact on the power grid. Third, the mechanical energy of the drive wheel can be stored by the multi-stage flywheel energy storage device, which not only has a higher power output characteristic, 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 can not only be used as an energy recovery device, but also as an auxiliary power supply device and a backup power supply device, which can not only effectively realize efficient energy recovery, but also effectively reduce the energy consumed and operational reliability during the use of the elevator.

[0039] 2. Other beneficial effects or advantages of the present application will be described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] in:

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

[0043] Figure 2 It is a schematic flow chart of the steps of an elevator energy recovery method provided by an exemplary embodiment of the present application.

[0044] Description of the reference numerals in the accompanying drawings:

[0045] 100- elevator car; 101- counterweight; 102- traction rope; 103- driving 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 purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0048] In addition, the terms "including" and "having" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusions. 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 optionally includes other steps or units that are not listed, or optionally includes other steps or units that are inherent to these processes, methods, products or devices. Among them, it should also be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0049] It should be noted that in the appendix to this application Figure 1In the figure, an elevator car 100, a counterweight 101, a traction rope 102 and a driving wheel 103 are also 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 volatility during the operation of the elevator, and the traction rope 102 is wound around the driving wheel 103 and its two ends are respectively connected to the counterweight 101 and the elevator car 100.

[0050] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] like Figure 1 As shown, according to the first aspect of the present application, there is provided an elevator energy recovery system, 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 used to connect with the driving wheel 103 of the elevator through the speed change mechanism 3, so that the kinetic energy of the motor 1 is transmitted to the driving wheel 103 through the speed change mechanism 3;

[0054] 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 the energy storage capacity of the second flywheel 22, and the energy storage capacity of the second flywheel 22 is smaller than the energy storage capacity of the third flywheel 23; the multi-stage flywheel energy storage device 2 is connected to the driving wheel 103 through a mechanical transmission mechanism 4 and a speed change mechanism 3;

[0055] The mechanical transmission mechanism 4 is configured to be switchable between a first linkage state, a second linkage state and a third linkage state; in the first linkage state, the first flywheel 21 is used to connect with 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 its stored energy into the mechanical energy of the drive wheel 103; in the second linkage state, the second flywheel 22 is used to connect with 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 its stored energy into the mechanical energy of the drive wheel 103; in the third linkage state, the third flywheel 23 is used to connect with 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 its 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] Through the above technical solution, when the motor 1 of the elevator is in the generator 1 state, the mechanical energy of the drive wheel 103 can be stored through 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-consuming braking, and there is no need to set up heat exchange or heat dissipation equipment, which can effectively reduce energy waste and elevator operation costs. 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 it will not cause an impact on the power grid. Third, the mechanical energy of the drive wheel 103 can be stored by the multi-stage flywheel energy storage device 2, which not only has a higher power output characteristic, 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 the mechanical energy of the driving wheel 103 when needed, the multi-stage flywheel energy storage device 2 of the present application can not only be used as an energy recovery device, but also can be used as an auxiliary power supply device and a backup power supply device, which can not only effectively realize efficient energy recovery, but also effectively reduce the energy consumed and operational reliability during the use of the elevator.

[0059] Among them, 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 successively increasing energy storage capacity, which can not only adapt to the needs of any operating state of the elevator, but also effectively improve the overall energy storage capacity of the multi-stage flywheel energy storage device 2 and the amount of power provided as a backup power supply device.

[0060] Specifically, the first flywheel 21 provided in the present application has the smallest energy storage capacity, but precisely because of its smallest energy storage capacity, its corresponding response speed is the fastest, that is, when the elevator starts and accelerates, the first flywheel 21 with low energy storage capacity and high response speed can quickly release its 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. When the elevator is stopped, the rotation state of the drive wheel 103 gradually slows down the rotation speed to no rotation, and there may be a large amount of energy that needs to be stored and recovered. In this way, the third flywheel 23 provided with a high energy storage capacity can meet the storage needs of these energies. In addition, the energy storage capacity of the second flywheel 22 is centered, and it can be used as a buffer adjustment energy storage unit to act as a buffer adjustment when the energy supply of the first flywheel 21 is insufficient or the storage capacity of the third flywheel 23 is insufficient, so as to ensure the smooth progress of the elevator energy recovery operation and the energy supply operation for the elevator.

[0061] In one embodiment of the present application, the energy storage capacity of the first flywheel 21 of the present application is 0.1kWh-1kWh, the energy storage capacity of the second flywheel 22 is 3kWh-7kWh, and the energy storage capacity of the third flywheel 23 is 13kWh-17kWh. Among them, when the energy storage capacity of the first flywheel 21 is 0.1kWh-1kWh, it has a faster response speed and can help the elevator start and accelerate in time. At the same time, the first flywheel 21 of this energy storage capacity can also adapt to the starting and acceleration requirements of most elevators. When the energy storage capacity of the third flywheel 23 is 13kWh-17kWh, it can have a sufficiently large energy storage capacity to effectively ensure that the mechanical energy of the drive wheel 103 during the elevator stop process is recovered, thereby ensuring the energy recovery efficiency. When the energy storage capacity of the second flywheel 22 is between 3kWh and 7kWh, the second flywheel 22 can have sufficient buffering capacity, and can be used as a backup energy supply when the energy supply of the first flywheel 21 is insufficient, and can also store excess energy when the energy storage capacity of the third flywheel 23 is insufficient.

[0062] It is understandable that, in this embodiment, the present application only provides a preferred solution, 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 situation of the elevator, and the present application does not make specific restrictions on this. For example, in a certain specific embodiment, the energy storage capacity of the first flywheel 21 can be set to 1kWh, the energy storage capacity of the second flywheel 22 can be set to 5kWh, and the energy storage capacity of the third flywheel 23 can be set to 15kWh.

[0063] In one embodiment of the present application, the mechanical transmission mechanism 4 of the present application is configured as any one of the following structures: 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, and a mechanical reversing structure with three output ends.

[0064] In this embodiment, the transmission structure with three output ends can selectively transmit the mechanical energy of the drive wheel 103 to the first flywheel 21, the second flywheel 22 or the third flywheel 23, so that the mechanical energy of the drive wheel 103 can be selectively stored 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 drive wheel 103.

[0065] Specifically, the mechanical transmission mechanism 4 can have a variety of optional implementations. For example, in one implementation, the mechanical transmission mechanism 4 can be set as a clutch combination structure with three output ends, which is a combination of multiple clutches in the existing related technology (which can be dry clutches, wet clutches or electromagnetic clutches) to control the connection relationship between the main shaft of the speed change 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 drive 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 set as a differential structure with three output ends, that is, using the differential principle, a differential with three output ends is designed so that the main shaft of the speed change 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 set as a solenoid valve and a hydraulic motor structure with three output ends, that is, the main shaft of the speed change mechanism 3 is connected to a hydraulic pump, and the hydraulic oil is controlled by the solenoid valve to selectively flow to the hydraulic motors corresponding to the three different output ends, thereby selectively driving the three driven shafts in the multi-stage flywheel storage device.

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

[0069] It can be understood that the above-mentioned three-output clutch combination structure, three-output differential structure, solenoid valve and three-output hydraulic motor structure, and three-output mechanical reversing structure have mature applications in the relevant technologies in this field, and the specific structure and working principle will not be elaborated in this application.

[0070] According to the second aspect of the present application, Figure 2 As shown, an elevator energy recovery method is provided, which is applied to the elevator energy recovery system of any technical solution in the first aspect of the present application, and the elevator energy recovery method comprises the following steps:

[0071] Step S1: The control unit obtains the operation data of the motor to identify the current operation state of the elevator, and the current operation state of the elevator includes a downward state, a deceleration state, a start and acceleration state, and a stop state;

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

[0073] Wherein, when the elevator is in a downward state or a 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 driving wheel can be stored by the first flywheel, the second flywheel or the third flywheel;

[0074] When the elevator is in 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 its stored energy into the mechanical energy of the driving wheel;

[0075] 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 mechanical energy of the driving wheel.

[0076] In this way, through such an elevator energy recovery method, after the control unit identifies the current operating state of the elevator through the operating data of the motor, it can perform corresponding energy storage or release processes according to the different operating states of the elevator to achieve energy recovery and reuse of the drive wheel, which can not only effectively improve the mechanical energy recovery efficiency of the drive wheel, but also help to reduce energy waste and elevator operating costs.

[0077] Specifically, when the elevator is in a downward or decelerating state, the control unit can store the mechanical energy of the driving wheel in the first flywheel, the second flywheel or the third flywheel by switching the linkage state of the mechanical transmission mechanism; wherein, first, when the elevator is in a starting and accelerating state, the first flywheel with a smaller energy storage capacity but the fastest response speed can be used to convert its stored energy into the mechanical energy of the driving wheel, thereby helping the elevator to start and accelerate more quickly; second, when the elevator is in a stopped state (that is, the elevator gradually decelerates from a moving state to a stopped state), the mechanical energy of the driving wheel can be stored in 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 in the present application has the smallest energy storage capacity, but it is precisely because of its smallest energy storage capacity that its 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 its stored energy to help the elevator start and accelerate. At the same time, the third flywheel provided in the present application has the largest energy storage capacity. When the elevator is stopped, the rotation state of the driving wheel gradually slows down the rotation speed to no rotation, and there may be a large amount of energy that needs to be stored and recovered. In this way, the third flywheel provided with a high energy storage capacity can meet the storage needs of these energies. In addition, the energy storage capacity of the second flywheel is centered, and it can be used as a buffer adjustment energy storage unit to act as a buffer adjustment when the first flywheel is insufficient in energy supply or the third flywheel has insufficient storage capacity, so as to ensure the smooth progress of the elevator energy recovery operation and the energy supply operation for the elevator.

[0079] In one embodiment of the present application, in step S2 of the present 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 when the number of operations of the elevator within a preset time interval is less than a set operation number threshold; the control unit may 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 off-peak period of elevator operation, the operating frequency of the elevator is low. Through the above technical solution, first, gradient energy storage can be formed to ensure that the mechanical energy of the drive wheel can be completely stored by the first flywheel, the second flywheel and the third flywheel one by one in the 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 timeliness of the response of the elevator start-up and acceleration state to adapt to the elevator operation needs during the off-peak period.

[0083] In one embodiment of the present application, when the elevator is in a downward state or a deceleration state, and the elevator is in a peak operation period, wherein the peak operation period is when the number of operations of the elevator within a preset time interval is greater than or equal to a set operation number 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 driving wheel; and, in the process of the elevator switching from the downward state or the deceleration state to the stop state to the starting and acceleration 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 driving wheel.

[0085] In this way, during the peak operation period of the elevator, the elevator needs to start and stop frequently, and the energy required to be stored and released in this process is relatively large. Compared with the method of first using the first flywheel to store and release energy (the first flywheel is likely to be insufficient to meet the requirements of energy storage and release, and the second flywheel or the third flywheel is needed to store or release energy), this implementation method makes it possible for the second flywheel or the third flywheel to meet the energy required to store and release the energy required by the multi-stage flywheel energy storage device during each start and stop of the elevator, thereby effectively improving the operating efficiency of the elevator energy recovery system (without the need to adjust the linkage state of the mechanical transmission structure).

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

[0087] If the first flywheel currently stores energy satisfy: When, A is the proportionality 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 its stored energy into mechanical energy of the driving wheel;

[0088] If the first flywheel currently stores energy satisfy: When the second flywheel or the third flywheel is in a state of rotation, 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 driving wheel.

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

[0090] In one embodiment of the present application, when the elevator is in the starting and accelerating state, and the first flywheel currently stores energy satisfy: , obtain the current storage energy of the second flywheel;

[0091] If the second flywheel currently stores energy satisfy: When, B is the proportionality 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 drive wheel;

[0092] If the second flywheel currently stores energy satisfy: When the third flywheel is in the state of rotation, 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 driving wheel.

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

[0094] According to the second aspect of the present application, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the elevator energy recovery method in any one of the technical solutions in the first aspect of the present application can be implemented.

[0095] It is understood that in this embodiment, the memory may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a read-only memory, a flash memory, a hard disk or a solid state drive; in addition, the memory may also include a combination of the above-mentioned types of memory. This application does not specifically limit this.

[0096] Similarly, the processor may be a processor that implements or executes various exemplary logic steps described in conjunction with the disclosure of the present application. The processor may 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. It may implement or execute various exemplary logic steps described in conjunction with the disclosure of the present application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0097] According to the third aspect of the present application, a computer-readable storage medium is also provided, on which a computer program is stored, characterized in that when the computer program is executed by a processor, the steps of the elevator energy recovery method in any technical solution in the first aspect of the present application can be implemented.

[0098] In this embodiment, the computer readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: an electrical connection with one or more wires, a portable computer disk, 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 disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above, or any other form of computer readable storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an application-specific integrated circuit (ASIC). In the embodiments of the present application, a computer-readable storage medium may be any tangible medium that contains or stores a program, which may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0099] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An elevator energy recovery system, characterized in that: It comprises 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 used to connect to the driving wheel of the elevator through the speed change mechanism (3), so that the kinetic energy of the motor (1) is transmitted to the driving wheel through the speed change mechanism (3); 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 smaller than the energy storage capacity of the second flywheel (22), and the energy storage capacity of the second flywheel (22) is smaller than the energy storage capacity of the third flywheel (23); the multi-stage flywheel energy storage device (2) is used to be connected to the driving wheel via the mechanical transmission mechanism (4) and the speed change mechanism (3); The mechanical transmission mechanism (4) is configured to be switchable between a first linkage state, a second linkage state and a third linkage state; in the first linkage state, the first flywheel (21) is used to connect with the drive wheel 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, or can convert its stored energy into the mechanical energy of the drive wheel; in the second linkage state, the second flywheel (22) is used to connect with the drive wheel 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, or can convert its stored energy into the mechanical energy of the drive wheel; in the third linkage state, the third flywheel (23) is used to connect with the drive wheel 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, or can convert its 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.

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

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

4. An elevator energy recovery method, characterized in that: Applied to the elevator energy recovery system according to any one of claims 1 to 3, the elevator energy recovery method comprises the following steps: Step S1: The control unit obtains the operation data of the motor to identify the current operation state of the elevator, wherein the current operation state of the elevator includes a downward state, a deceleration state, a start and acceleration state, and a stop state; Step S2: The control unit switches the linkage state of the mechanical transmission mechanism according to the current operating state of the elevator; Wherein, when the elevator is in a downward state or a 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 driving wheel can be stored by the first flywheel, the second flywheel or the third flywheel; When the elevator is in 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 its stored energy into the mechanical energy of the driving wheel; When the elevator is in a stopped state, the control unit 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 convert its stored energy into mechanical energy of the driving wheel.

5. The elevator energy recovery method according to claim 4, characterized in that: In step S2, when the elevator is in a downward state or a decelerating state, and the elevator is in a low-peak operation period, wherein the low-peak operation period is when the number of operations of the elevator within a preset time interval is less than a set operation number threshold; The control unit first switches the mechanical transmission mechanism to a first linkage state so that the first flywheel can be used to store the mechanical energy of the driving wheel; 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; 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.

6. The elevator energy recovery method according to claim 4, characterized in that: When the elevator is in a downward state or a decelerating state, and the elevator is in a peak operation period, wherein the peak operation period is when the number of operations of the elevator within a preset time interval is greater than or equal to a set operation number threshold; The control unit first switches the mechanical transmission structure to a second linkage state or a third linkage state, so that the second flywheel or the third flywheel can be used to store mechanical energy of the driving wheel; Furthermore, in the process of the elevator switching from a downward state or a deceleration state to a stop state to a starting and acceleration 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 mechanical energy of the drive wheel.

7. The elevator energy recovery method according to claim 4, characterized in that: In step S2, when the elevator is in the starting and accelerating state, the current stored energy of the first flywheel is obtained; If the first flywheel currently stores energy satisfy: When A is the proportionality 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 its stored energy into the mechanical energy of the driving 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 driving wheel.

8. The elevator energy recovery method according to claim 7, characterized in that: When the elevator is in the starting and accelerating state, and the first flywheel currently stores energy satisfy: , obtain the current storage energy of the second flywheel; If the second flywheel currently stores energy satisfy: When, B is the proportionality 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 the mechanical energy of the driving wheel; If the second flywheel currently stores energy satisfy: When the control unit switches the mechanical transmission mechanism to the third linkage state, the third flywheel can convert its stored energy into the mechanical energy of the driving wheel.

9. 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, the steps of the elevator energy recovery method described in any one of claims 4 to 8 can be implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the elevator energy recovery method described in any one of claims 4 to 8 can be implemented.

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