Elevator energy-saving device

Abstract

The invention provides an elevator energy-saving device which is connected to an elevator frequency converter bus in parallel and comprises a battery pack, a BMS battery management system, a power control system, a DC-DC direct-current power source and a PLC, the DC-DC direct-current power source is connected with the BMS battery management system and connected to the elevator frequency converter bus in parallel, and the power control system is connected with the PLC. The PLC is connected with the DC-DC direct-current power supply, and the DC-DC direct-current power supply transforms the voltage accessed from the battery pack to the second preset voltage under the action of the PLC, so that the voltage of the high-voltage end is controlled to be the second preset voltage; under the action of the high-low voltage difference, when the elevator generates power, the voltage on the elevator frequency converter bus does not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device. The invention has the characteristics of energy conservation, high efficiency, reduced operation cost, stable operation, reduced power grid pressure and prolonged service life of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator equipment, and in particular to an elevator energy-saving device. Background Art

[0002] An elevator (vertical elevator) is a type of transportation equipment that transports pedestrians or goods vertically. It is a common transportation equipment in people's daily lives. Here are some common elevator energy-saving devices:

[0003] (1) Elevator energy feedback device

[0004] Energy feedback technology is gradually maturing. By recycling and reusing the regenerative electrical energy generated during the operation of the elevator, energy consumption is effectively reduced. At the same time, the application of intelligent control systems also makes the operation of elevators more efficient, and can flexibly adjust the operation mode according to actual usage, reducing unnecessary energy consumption. In addition, the use of new materials in elevator components, such as lighter and stronger alloy materials, reduces the weight of the elevator itself, thereby reducing the energy demand during operation.

[0005] This technology still has some defects and shortcomings:

[0006] 1. Cost issue. The initial investment of the energy feedback system is relatively high, which limits its large-scale application to a certain extent, especially for the renovation of some old elevators, the cost factor has become one of the obstacles.

[0007] 2. Compatibility issues. Elevators of different brands and models have differences in electrical characteristics and other aspects, which may lead to poor compatibility between the energy feedback system and the elevator system, affecting its normal operation and energy-saving effect.

[0008] 3. Environmental adaptability. Under some special environmental conditions, such as high temperature, high humidity, and strong electromagnetic interference, the performance of the energy feedback system may be affected to a certain extent, resulting in problems such as decreased stability.

[0009] 4. Energy feedback quality. Although electric energy can be fed back, the quality of the electric energy may fluctuate to a certain extent, causing certain interference to the power grid, and further optimization of the control strategy is needed to improve it.

[0010] 5. Inconsistent technical standards. The quality of energy feedback system products on the market varies greatly, and there is a lack of unified and clear technical standards and specifications, which brings certain troubles to users when choosing and using them.

[0011] (2) Capacitor type elevator energy saving device

[0012] Capacitor type elevator energy saving device is a technology that uses capacitors to store electrical energy, which is used to improve the energy efficiency of elevators. The following is a detailed description of the development status, defects and shortcomings of capacitor type elevator energy saving device technology:

[0013] Capacitor-type elevator energy-saving device technology has been developed in recent years. As the focus on energy efficiency increases, the elevator industry is also actively exploring energy-saving technologies. Capacitor-type energy-saving devices reduce the energy consumption of elevators by recycling and storing energy during elevator operation and then releasing this energy when needed. Some elevator manufacturers have begun to integrate capacitor-type energy-saving devices into their products and have achieved certain energy-saving effects. In addition, research institutions and scholars are also constantly exploring and improving capacitor-type energy-saving technologies to improve their performance and reliability.

[0014] This technology still has some defects and shortcomings:

[0015] 1. Limited energy storage capacity: The energy storage capacity of capacitors is relatively small, which limits their application in elevator energy saving. For large elevators or high-load operation, larger capacity energy storage devices may be required to achieve significant energy saving effects.

[0016] 2. Charge and discharge efficiency: There is a certain amount of energy loss in the charge and discharge process of the capacitor, which will affect the overall efficiency of the energy-saving device. In addition, frequent charge and discharge cycles may also affect the life of the capacitor.

[0017] 3. Higher cost: Compared with traditional elevator systems, capacitor-type energy-saving devices have higher costs. This includes the cost of the capacitor itself as well as the cost of the related control system and circuit. The higher cost may limit its widespread application in some markets.

[0018] 4. Environmental adaptability: Capacitors are sensitive to ambient conditions such as temperature and humidity, and additional measures may be required to ensure their reliability and performance in different environments.

[0019] 5. Maintenance and management: Capacitor-type energy-saving devices require regular maintenance and inspection to ensure their normal operation and performance. This increases the maintenance cost and complexity of the elevator system.

[0020] (3) Ard Elevator Automatic Rescue Device

[0021] The development of automatic elevator rescue devices can be traced back to the 1990s, when some elevator manufacturers began to develop and produce automatic elevator power outage rescue devices. These devices mainly use batteries as backup power sources. When the elevator loses power, the batteries can provide a short period of power for the elevator, allowing the elevator to run to the nearest floor and open the door to allow passengers to leave safely.

[0022] With the continuous advancement of technology, the performance and functions of elevator automatic rescue devices have been continuously improved. At present, the elevator automatic rescue devices on the market have a variety of functions, such as automatic detection of elevator faults, automatic start of rescue procedures, automatic charging, etc. At the same time, some new elevator automatic rescue devices also use more advanced technologies, such as supercapacitors and lithium, etc. The application of these technologies not only improves the performance and reliability of elevator automatic rescue devices, but also reduces their cost and maintenance difficulty.

[0023] This technology still has some defects and shortcomings:

[0024] 1. Limited scope of application: Elevator automatic rescue devices can usually only provide short-term power support when the elevator loses power or fails, and cannot solve the problem of long-term elevator shutdown or major failure.

[0025] 2. Reliability needs to be improved: The elevator automatic rescue device is a mechatronic device, and its reliability is affected by many factors, such as life, circuit failure, mechanical component damage, etc. If the elevator automatic rescue device fails, it may lead to rescue failure and endanger the lives of passengers.

[0026] 3. High maintenance cost: The automatic rescue device of the elevator needs regular maintenance and upkeep, such as replacement, circuit inspection, cleaning of mechanical parts, etc. These maintenance tasks require professional technicians and equipment, and the maintenance cost is high.

[0027] 4. High environmental requirements: The elevator automatic rescue device has high environmental requirements, such as temperature, humidity, dust, etc. If the environmental conditions are harsh, it may affect the performance and reliability of the elevator automatic rescue device.

[0028] 5. Lack of unified standards: At present, the standards and specifications of elevator automatic rescue devices are not perfect enough. There are large differences in performance, function, reliability, etc. between elevator automatic rescue devices produced by different manufacturers, which brings certain difficulties to users' selection and use. Summary of the invention

[0029] The object of the present invention is to solve at least one of the technical drawbacks.

[0030] To this end, an object of the present invention is to provide an elevator energy-saving device to solve the problems mentioned in the background technology and overcome the shortcomings of the prior art.

[0031] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides an elevator energy-saving device, wherein one end of a main contactor is connected to a power grid, and the other end of the main contactor is connected to an elevator frequency converter, wherein the elevator frequency converter rectifies the connected power grid voltage and transmits it to the elevator frequency converter bus, and a high-frequency switch and a brake resistor connected in series are connected in parallel on the elevator frequency converter bus; an inverter is connected to the rear ends of the high-frequency switch and the brake resistor, and the inverter is further connected to the elevator;

[0032] After the elevator potential energy generates electricity, the voltage of the elevator inverter bus rises, and when it rises to a first preset voltage, the braking resistor works, and the high-frequency switch is switched on and off to maintain the voltage at the first preset voltage;

[0033] The elevator energy-saving device is connected in parallel to the elevator inverter bus, and includes: a battery pack, a BMS battery management system, a power control system, a DC-DC direct current power supply and a PLC controller, wherein the DC-DC direct current power supply is connected to the BMS battery management system and connected in parallel to the elevator inverter bus, the PLC controller is connected to the DC-DC direct current power supply, and the DC-DC direct current power supply, under the action of the PLC controller, transforms the voltage connected from the battery pack to the second preset voltage to control the voltage at the high-voltage end to the second preset voltage;

[0034] Under the effect of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus will not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device.

[0035] Preferably, in any of the above schemes, the first preset voltage is 550-680V, ​​and the second preset voltage is 580V.

[0036] Preferably, from any of the above schemes, when the power generation of the elevator exceeds a threshold value, after the elevator energy-saving device is fully loaded, the excess electric energy causes the voltage to rise to the first preset voltage, and the braking resistor is started to consume the excess electric energy.

[0037] Preferably, any of the above schemes is that the elevator energy-saving device is connected in parallel with a plurality of elevators, and the elevator inverter bus of each elevator is connected in parallel to the high-voltage end of the DC-DC direct current power supply after passing through a circuit breaker and a contactor.

[0038] Preferably, any of the above schemes controls the current of the elevator in power generation state to flow directly to the elevator in power consumption state through the elevator energy saving device;

[0039] When multiple elevators generate or discharge electricity at the same time, the battery pack will be used first, and the grid will be used for power supply after the battery pack power drops to the preset value;

[0040] When the elevator is not in power-using state, the current first flows to the DC-DC power supply and then is stored in the battery pack.

[0041] Preferably, any of the above schemes further includes one or more DC meters, which correspond to the elevators one by one, are connected between the elevators and the elevator energy-saving device, and are used to record the power data exchanged between the corresponding single elevator and the elevator energy-saving device.

[0042] Preferably, any of the above schemes comprises: voltage, current, forward electric energy and reverse electric energy.

[0043] Preferably, any of the above schemes uses the DC meter to charge by recording the amount of electricity that flows out of or into the meter in one direction, including the amount of electricity used from the battery pack and the amount of electricity generated by other equipment that directly acts on the elevator.

[0044] Preferably, any of the above schemes is that each of the DC meters is connected to the negative pole of the elevator inverter bus and the negative pole of the high-voltage bus of the corresponding elevator through a shunt, and the high-voltage DC relay is connected to the positive pole of the elevator inverter bus and the positive pole of the high-voltage bus of the corresponding elevator.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. Energy saving and high efficiency: It can recycle the potential energy and kinetic energy generated during the operation of the elevator and convert them into electrical energy for storage for use in subsequent operation of the elevator, thereby significantly reducing the energy consumption of the elevator.

[0047] 2. Reduce operating costs: By saving energy, electricity consumption is reduced, saving a lot of electricity expenses for elevator operators.

[0048] 3. Smooth operation: It helps to improve the smooth operation of the elevator, reduce the impact during starting and stopping, and improve the comfort of passengers.

[0049] 4. Reduce grid pressure: During peak hours of electricity consumption, energy storage batteries can power elevators, reducing dependence on the grid and reducing grid load pressure.

[0050] 5. Environmental protection and emission reduction: Reducing energy consumption means reducing greenhouse gas emissions, which has positive significance for environmental protection.

[0051] 6. Emergency backup: In emergency situations such as power outages, the energy storage battery pack can provide a certain amount of power support to ensure the basic operation of the elevator and ensure the safety of passengers.

[0052] 7. Extend equipment life: Smooth operation and reasonable energy management help reduce the wear of elevator mechanical parts and extend the service life of the elevator.

[0053] 8. Strong adaptability: It can be applied to elevators of various types and specifications and has broad application prospects.

[0054] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0056] Figure 1 is a structural diagram of an elevator energy-saving device according to an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of multiple elevator devices connected in parallel according to an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of calculating the power generation of an elevator by a DC meter according to an embodiment of the present invention;

[0059] Figure 4 1 is a wiring diagram of a high-voltage bus, a bidirectional DC-DC, a high-voltage DC relay and a contactor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0061] This invention proposes an elevator energy-saving device, which controls the elevator inverter bus voltage to automatically match the current path, giving priority to the energy-saving device line. If the energy-saving device supplies insufficient power, it automatically uses the grid current. The process is automatically matched by the circuit, which does not affect the elevator, does not need to stop the elevator, and the elevator runs smoothly.

[0062] Combine the following Figures 1 to 4 The elevator energy-saving device according to the embodiment of the present invention is described.

[0063] like Figure 1As shown, one end of the main contactor 2 is connected to the power grid 1, and the other end of the main contactor 2 is connected to the elevator inverter 3. The elevator inverter 3 rectifies the connected power grid voltage and transmits it to the elevator inverter bus 8, and the elevator inverter bus 8 is connected in parallel with a high-frequency switch and a brake resistor 4 connected in series. The rear end of the high-frequency switch and the brake resistor 4 is connected to an inverter 5, and the inverter 5 is further connected to the motor M of the elevator. The motor M is further connected to the elevator car 6 and the counterweight 7.

[0064] In the embodiment of the present invention, the elevator inverter 3 may adopt a rectifier.

[0065] After the elevator potential energy generates electricity, the voltage of the elevator inverter bus 8 rises. When it rises to the first preset voltage, the braking resistor 4 works, and the high-frequency switch is turned on and off to maintain the voltage at the first preset voltage.

[0066] The elevator energy-saving device 100 is connected in parallel to the elevator inverter busbar and includes: a battery pack 110 , a BMS battery management system 140 , a power control system, a DC-DC direct current power supply 120 and a PLC controller 130 .

[0067] Specifically, the DC-DC power supply 120 is connected to the BMS battery management system 140 and is connected in parallel to the elevator inverter bus 8. The PLC controller 130 is connected to the DC-DC power supply 120. Under the action of the PLC controller 130, the DC-DC power supply 120 transforms the voltage connected from the battery pack 110 to a second preset voltage to control the voltage at the high voltage end at the second preset voltage.

[0068] In the embodiment of the present invention, the DC-DC direct current power supply 120 can be bi-phase transformed from 400V to 500-700V through the configured boost standard, specifically changing the terminal voltage of the battery pack 110 of 400V to the required target voltage of 580V.

[0069] Under the effect of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus 8 will not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device 100. When the power generation of the elevator exceeds the threshold, after the elevator energy-saving device 100 is fully loaded, the excess electric energy causes the voltage to rise to the first preset voltage, and the brake resistor 4 is started to consume the excess electric energy.

[0070] In the embodiment of the present invention, the first preset voltage is 550-680 V, and the second preset voltage is 580 V. It should be noted that the values ​​of the first preset voltage and the second preset voltage are not limited to the above examples, and can be adjusted as needed.

[0071] The power control system refers to electronic components such as DC contactors, AC contactors, electric meters, fuses, etc., which are in the electrical cabinet and are controlled by the PLC controller 130.

[0072] Specifically, refer to Figure 1 , the grid voltage is usually 380V, and the voltage of the elevator inverter bus 8 is 540V after rectification by the elevator inverter. When the elevator potential energy generates electricity, the voltage of the elevator inverter bus 8 will rise. Generally, when it reaches 700V, the brake resistor 4 will work, and the voltage is maintained at 700V by switching the high-frequency switch back and forth. The elevator energy-saving device 100 will be connected in parallel to the elevator inverter bus 8, and the voltage at the high-voltage end will be controlled at 580V through the DC-DC direct current power supply 120. Through the high and low voltage difference, when the elevator generates electricity, the bus voltage will not rise to 700V, and the current will automatically flow directly to the energy-saving device. If the power generation is too large, after the elevator energy-saving device 100 is fully loaded, the excess electric energy will cause the voltage to rise to 700V, start the brake resistor 4, and consume the excess electric energy. Therefore, the elevator main line will not be affected, and the grid voltage will be very stable.

[0073] like Figure 2 As shown, the elevator energy-saving device 100 is connected in parallel with a plurality of elevators, and the elevator inverter bus 8 of each elevator is connected to the high-voltage end of the DC-DC power supply 120 through a circuit breaker and a contactor.

[0074] A plurality of elevators are connected in parallel, and the elevator energy-saving device 100 is used to control the current of the elevator in power generation state to flow directly to the elevator in power consumption state.

[0075] When multiple elevators generate or discharge electricity at the same time, the battery pack 110 is used first, and the power grid is used for power supply after the battery pack 110 drops to a preset value. When there is no elevator in power-using state, the current first flows to the DC-DC power supply 120 and then is stored in the battery pack 110.

[0076] refer to Figure 2 , three elevators (first elevator, second elevator and third elevator) are connected in parallel with the elevator energy saving device 100, which is connected to the DC-DC power supply 120 through a circuit breaker and a contactor. After the circuit is connected, one elevator is generating electricity and the other is using electricity. The current will flow directly to the line of the elevator using electricity. If there is no elevator using electricity, the current will flow to the DCDC and then stored in the energy storage battery pack 110. It is automatically executed by the circuit without additional control.

[0077] In addition, the following situations also apply:

[0078] (1) The three elevator devices generate electricity at the same time, and the electric energy is stored in the battery pack 110, and the brake resistor 4 consumes the stored energy;

[0079] (2) When the three elevators use electricity at the same time, the battery pack 110 is used first, and if it is insufficient, it is directly supplemented by the power grid;

[0080] (3) There are two generators and one power user. The generator gives priority to the user, and the remaining power is stored in the battery bank 110.

[0081] like Figure 3 As shown, the elevator energy saving device 100 of the embodiment of the present invention further includes: one or more DC meters 200. The DC meters 200 correspond to the elevators one by one, are connected between the elevators and the elevator energy saving device 100, and are used to record the power data exchanged between the corresponding single elevator and the elevator energy saving device 100.

[0082] like Figure 4 As shown, each DC meter 200 is connected to the negative pole of the elevator inverter bus 8 and the negative pole of the high-voltage bus of the corresponding elevator through a shunt, and the high-voltage DC relay is connected to the positive pole of the elevator inverter bus 8 and the positive pole of the high-voltage bus of the corresponding elevator.

[0083] In the embodiment of the present invention, the electric quantity data includes: voltage, current, forward electric energy and reverse electric energy, etc. It should be noted that the electric quantity data is not limited to the above examples, and may also include other data, which is set as required and will not be described in detail here.

[0084] Specifically, the power recording method of the elevator equipment can record the power in and out of the line by connecting a single device to the shunt and the electric meter, including voltage, current, forward power and reverse power. Each elevator is connected to a DC meter 200 to accurately record the power exchanged between the single elevator and the elevator energy saving device 100.

[0085] The billing method of the DC meter 200 is to record the amount of electricity that flows out of or into the meter in one direction, including the amount of electricity used from the battery pack 110 and the amount of electricity generated by other devices that directly acts on the elevator. This method can avoid calculating the amount of electricity consumed by the power consumption of the equipment. The use of a one-way statistical method can avoid two-way mutual cancellation. If calculated in a one-way outflow method, factors such as equipment internal consumption and conversion efficiency can all be included in the equipment, and the amount of electricity that goes out is the amount of electricity saved. If calculated in a one-way inflow method, the actual amount of electricity generated by the elevator can be calculated. Which method to use depends on the customer's specific situation.

[0086] The elevator energy-saving device of the embodiment of the present invention controls the direction of the current by changing the control frequency converter elevator inverter bus voltage; realizes multiple devices connected in series and automatic matching, and the electricity generated by the power-generating elevator directly acts on the power-consuming elevator; adopts the meter billing method to record the outflow of electricity and avoid interference from other factors (such as power loss). Compared with the energy feedback system, the energy storage type of the device of the present invention can avoid causing fluctuations in the power grid, has higher energy-saving efficiency and lower cost. Compared with the capacitor type, the energy storage type of the device of the present invention can store a large amount of electricity, has a high power saving ratio, is more applicable to a wider range of scenarios, and has lower cost.

[0087] The device of the present invention can better promote the development of elevator energy feedback system technology. It is necessary to further reduce costs, improve compatibility and environmental adaptability, improve technical standards, and strengthen research and development to improve the quality and stability of energy feedback, so as to promote its wider and more effective application in the elevator field and make greater contributions to energy conservation and emission reduction.

[0088] The device of the present invention can supply 2-3 elevators at the same time, which has an absolute advantage in cost. At the same time, the power saving efficiency is greatly increased by instantly transmitting power between different elevators. There is a complete power recording and billing system.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0090] It is not difficult for those skilled in the art to understand that the present invention includes any combination of the invention content and specific implementation methods of the above specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0091] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elevator energy-saving device, characterized in that: One end of the main contactor is connected to the power grid, and the other end of the main contactor is connected to the elevator frequency converter, and the elevator frequency converter rectifies the connected power grid voltage and transmits it to the elevator frequency converter bus, and the elevator frequency converter bus is connected in parallel with a high-frequency switch and a brake resistor connected in series; an inverter is connected to the rear end of the high-frequency switch and the brake resistor, and the inverter is further connected to the elevator; After the elevator potential energy generates electricity, the voltage of the elevator inverter bus rises, and when it rises to a first preset voltage, the braking resistor works, and the high-frequency switch is switched on and off to maintain the voltage at the first preset voltage; The elevator energy-saving device is connected in parallel to the elevator inverter bus, and includes: a battery pack, a BMS battery management system, a power control system, a DC-DC direct current power supply and a PLC controller, wherein the DC-DC direct current power supply is connected to the BMS battery management system and connected in parallel to the elevator inverter bus, the PLC controller is connected to the DC-DC direct current power supply, and the DC-DC direct current power supply, under the action of the PLC controller, transforms the voltage connected from the battery pack to the second preset voltage to control the voltage at the high-voltage end to the second preset voltage; Under the effect of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus will not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device.

2. The elevator energy saving device according to claim 1, characterized in that: The first preset voltage is 550-680V, ​​and the second preset voltage is 580V.

3. The elevator energy saving device according to claim 1, characterized in that: When the power generation of the elevator exceeds a threshold value, after the elevator energy-saving device is fully loaded, the excess electric energy causes the voltage to rise to the first preset voltage, and the braking resistor is started to consume the excess electric energy.

4. The elevator energy saving device according to claim 1, characterized in that: The elevator energy-saving device is connected in parallel with a plurality of elevators, and the elevator inverter busbar of each elevator is connected in parallel to the high-voltage end of the DC-DC direct current power supply through a circuit breaker and a contactor.

5. The elevator energy saving device according to claim 4, characterized in that: The elevator energy-saving device controls the current of the elevator in the power generation state to flow directly to the elevator in the power consumption state; When multiple elevators generate or discharge electricity at the same time, the battery pack will be used first, and the grid will be used for power supply after the battery pack power drops to the preset value; When the elevator is not in power-using state, the current first flows to the DC-DC power supply and then is stored in the battery pack.

6. The elevator energy saving device according to claim 1 or 4, characterized in that: It also includes one or more DC meters, which correspond to the elevators one by one, are connected between the elevators and the elevator energy-saving device, and are used to record the power data exchanged between the corresponding single elevator and the elevator energy-saving device.

7. The elevator energy saving device according to claim 6, characterized in that: The electrical quantity data includes: voltage, current, forward electrical energy and reverse electrical energy.

8. The elevator energy saving device according to claim 6, characterized in that: The DC meter is charged by recording the amount of electricity that flows out of or into the meter in one direction, including the amount of electricity used from the battery pack and the amount of electricity generated by other equipment that directly acts on the elevator.

9. The elevator energy saving device according to claim 6, characterized in that: Each of the DC meters is connected to the negative pole of the elevator inverter bus and the negative pole of the high-voltage bus of the corresponding elevator through a shunt, and the high-voltage DC relay is connected to the positive pole of the elevator inverter bus and the positive pole of the high-voltage bus of the corresponding elevator.

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