Energy-saving emergency rescue device for elevator and control method

Abstract

The invention provides an elevator energy-saving emergency rescue device and a control method. The elevator energy-saving emergency rescue device comprises a traction machine, an elevator frequency converter, a bidirectional DC-DC converter, an energy storage device, a DC-AC inverter, an elevator controller and a power failure emergency controller. The high-voltage side of the bidirectional DC-DC converter is connected with a direct-current bus of the elevator frequency converter, and the low-voltage side of the bidirectional DC-DC converter is connected to the energy storage device; the direct current side of the DC-AC inverter is connected to the energy storage device, and the alternating current side of the DC-AC inverter is connected with the alternating current input end of the elevator frequency converter; the power failure emergency controller is connected to the DC-AC inverter, when power failure of a power grid is detected, the DC-AC inverter inverts direct current in the energy storage device into alternating current, the alternating current obtained through inversion is transmitted to the alternating current input end of the elevator frequency converter and the elevator controller, and the elevator frequency converter outputs the alternating current to the elevator controller. And the elevator runs to the flat layer, and the car door is opened.

Description

Technical Field

[0001] The invention belongs to the field of elevators, and in particular relates to an elevator energy-saving emergency rescue device and a control method. Background Art

[0002] At present, there are about 10 million elevators in China. In order to meet the demand for emission reduction, it is necessary to promote energy-saving applications of elevators as soon as possible while improving the safety of elevators.

[0003] Traditional elevators use braking resistors (energy consumption resistors) to directly dissipate the energy generated by the traction machine when it is working in braking conditions as heat, resulting in energy waste. In addition, when the power grid fails, the elevator requires manual rescue, and the trapped people cannot escape in time, which is dangerous. Figure 1 As shown, the elevator wastes a lot of energy and does not have emergency rescue function.

[0004] Therefore, a better elevator energy-saving emergency rescue device and control method are needed to solve the above problems. Summary of the invention

[0005] The present invention provides an elevator energy-saving emergency rescue device and a control method.

[0006] The present invention provides an elevator energy-saving emergency rescue device, which comprises a traction machine, an elevator frequency converter, a bidirectional DC-DC converter, an energy storage device, a DC-AC inverter, an elevator controller and a power failure emergency controller; the high voltage side of the bidirectional DC-DC converter is connected to the DC bus of the elevator frequency converter, and the low voltage side of the bidirectional DC-DC converter is connected to the energy storage device; the energy storage device is used to store the energy generated when the traction machine is working; the DC side of the DC-AC inverter is connected to the energy storage device, and the AC side of the DC-AC inverter is connected to the AC input end of the elevator frequency converter, and the elevator frequency converter is used to control the main circuit; the power failure emergency controller is connected to the DC-AC inverter, and is used to control the DC-AC inverter to invert the DC power in the energy storage device into AC power when detecting a power failure in the power grid, and transmit the inverted AC power to the AC input end of the elevator frequency converter and the elevator controller, so that the elevator controller runs the elevator to a level floor and opens the car door.

[0007] The present invention also provides a method for an elevator energy-saving emergency rescue device, comprising: if a power outage in the power grid corresponding to the elevator is detected, the power outage emergency controller controls the DC-AC inverter to invert the direct current in the energy storage device to obtain alternating current; the alternating current is transmitted to the AC input end of the elevator inverter and the elevator controller; according to the elevator controller and the elevator inverter, the elevator is controlled to run to a target level and the car door is opened, the target level being the nearest floor to which the elevator corresponds when the power grid corresponding to the elevator is out of power.

[0008] Compared with the prior art, the energy generated when the traction machine is braked is stored in the energy storage device through the bidirectional DC-DC converter, and when the traction machine is in traction working condition, the energy is released from the energy storage device through the bidirectional DC-DC converter, which greatly improves the energy saving rate of the elevator. At the same time, when the elevator is powered off, the energy stored in the energy storage device is also used for automatic emergency rescue of the elevator. The power outage emergency controller inverts the energy stored in the energy storage device through the DC-AC inverter and uses it to power the elevator. After the elevator is operated to the level floor, the door is automatically opened, and the trapped people can evacuate by themselves, which improves the safety of the elevator during power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural block diagram of an elevator device in the prior art; Figure 2 A schematic structural diagram of an elevator energy-saving emergency rescue device provided by a first embodiment of the present invention; Figure 3 A schematic structural diagram of an elevator energy-saving emergency rescue device provided by a second embodiment of the present invention; Figure 4 A schematic flow chart of a control method for an elevator energy-saving emergency rescue device provided by the present invention. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0011] See also Figure 2 , Figure 2 A schematic structural diagram of an elevator energy-saving emergency rescue device provided by a first embodiment of the present invention; The elevator energy-saving emergency rescue device 100 includes a traction machine 10, an elevator frequency converter 20, a bidirectional DC-DC converter 40, an energy storage device 50, a DC-AC inverter 60, an elevator controller 30, and a power failure emergency controller 70; the high-voltage side of the bidirectional DC-DC converter 40 is connected to the DC bus of the elevator frequency converter 20, and the low-voltage side of the bidirectional DC-DC converter 40 is connected to the energy storage device 50; the energy storage device 50 is used to store the energy generated by the traction machine 10 when it is working; the DC side of the DC-AC inverter 60 is connected to the The energy storage device 50, the AC side of the DC-AC inverter 60 is connected to the AC input end of the elevator inverter 20, and the elevator inverter 20 is used to control the main circuit; the power outage emergency controller 70 is connected to the DC-AC inverter 60, and is used to control the DC-AC inverter 60 to invert the DC power in the energy storage device 50 into AC power when a power outage is detected in the power grid, and transmit the inverted AC power to the AC input end of the elevator inverter 20 and the elevator controller 30, so that the elevator controller 30 runs the elevator to the level floor and opens the car door.

[0012] The traction machine 10 is connected to the bidirectional DC-DC converter 40 via the elevator inverter. The traction machine 10 includes a car (not shown), a counterweight (not shown) and a traction wheel (not shown). The car and the counterweight are suspended on both sides of the traction wheel by ropes. The traction machine 10 includes two working states. When the traction machine 10 is in a traction state, the total weight of the car is greater than the weight of the counterweight, and the car moves upward, or the total weight of the car is less than the weight of the counterweight, and the car moves downward; when the traction machine 10 is in a braking state, the total weight of the car is less than the weight of the counterweight, and the car moves upward, or the total weight of the car is greater than the weight of the counterweight, and the car moves downward.

[0013] When the hoisting machine 10 is in a braking condition, the high voltage side of the bidirectional DC-DC converter 40 is connected to the DC bus of the elevator inverter 20, and the low voltage side of the bidirectional DC-DC converter 40 is connected to the energy storage device 50. The energy generated by the hoisting machine 10 is stored in the energy storage device 50 via the bidirectional DC-DC converter 40, thereby avoiding the situation that when the hoisting machine 10 is in a braking state, the energy generated by the motor in the generating state will cause the bus voltage of the elevator inverter 20 to rise. The elevator controller 30 controls the braking resistor to intervene, and the excess energy is directly consumed by the braking resistor. Only when the braking power exceeds the power of the bidirectional DC-DC converter 40 or the energy storage device 50 is fully charged, will it be consumed through the braking resistor.

[0014] When the hoisting machine 10 is in traction operation, the energy stored in the energy storage device 50 is released to the DC bus of the elevator inverter 20 through the bidirectional DC-DC converter 40 to supply the traction work of the hoisting machine 10. When the power required by the hoisting machine 10 exceeds the power of the bidirectional DC-DC converter 40 or the energy storage device 50 is insufficient, power can also be drawn from the power grid through the elevator inverter 20, so that the energy storage device 50 can complete the storage and utilization of energy, thereby improving the energy saving rate of the elevator.

[0015] It should be noted that the DC-AC inverter 60 is a three-phase inverter or a single-phase inverter, which can be adapted according to different elevator models. A single-phase inverter can also be used to output 220VAC, which is then converted into 380VAC for elevator use through an ordinary industrial frequency transformer. There is no specific limitation.

[0016] It should be further explained that the energy storage device 50 can be any structure of a super capacitor, a battery, or a nano capacitor, and any structure is acceptable as long as it has the function of storing energy, and there is no specific limitation.

[0017] See also Figure 3 , Figure 3 A schematic diagram of the structure of an elevator energy-saving emergency rescue device provided in the second embodiment of the present invention; in this embodiment, the DC-AC inverter 60A is connected to the high-voltage DC bus side of the bidirectional DC-DC converter 40A, and the energy storage device 50A is connected to the bidirectional DC-DC converter 40A. When the power outage emergency controller 70A detects a power outage in the power grid, the electric energy of the energy storage device 50A is released through the bidirectional DC-DC converter 40A, and the bidirectional DC-DC converter 40A boosts the circuit voltage, and the DC-AC inverter 60A no longer needs to boost the circuit voltage. The DC-AC inverter 60A inverts the high-voltage DC power into the required AC power, which is different from the DC-AC inverter 60 in the first embodiment, which first boosts the voltage of the energy storage device 50 and then inverts it into AC power.

[0018] See also Figure 4 , Figure 4 The control method of the elevator energy-saving emergency rescue device provided by the present invention is a flow chart of the control method of the elevator energy-saving emergency rescue device. The control method of the elevator energy-saving emergency rescue device can be applied to any of the above embodiments, and the control method of the elevator energy-saving emergency rescue device includes: 901. If it is detected that the power grid corresponding to the elevator is out of power, control the DC-AC inverter 60 to invert the direct current in the energy storage device 50 to obtain alternating current; In this embodiment, the power failure emergency controller 70 can detect whether the power grid corresponding to the elevator is out of power, determine the operating voltage corresponding to the elevator, and control the DC-AC inverter 60 to invert the direct current in the energy storage device 50 according to the operating voltage to obtain the alternating current. It can be understood that the alternating current can be three-phase alternating current or single-phase alternating current to facilitate adaptation to different elevator models, and the volt alternating current of the elevator controller 30 can be 220VAC or 380VAC.

[0019] 902. Transmit the AC power to the AC input terminal of the elevator inverter 20 and the elevator controller 30; In this embodiment, the DC-AC inverter 60 transmits the AC power to the AC input terminal of the elevator inverter 20 and the elevator controller 30. When the power grid fails, the AC power can be used to power the elevator for a short time. The elevator controller 30 generates a control signal for the elevator based on the elevator inverter 20 to realize automatic power failure emergency rescue of the elevator.

[0020] 903. According to the elevator controller 30 and the elevator inverter 20, the elevator is controlled to run to a target level and the car door is opened. The target level is the nearest floor corresponding to the elevator when the power grid corresponding to the elevator is out of power.

[0021] In this embodiment, the elevator controller 30 and the elevator inverter 20 determine the operating status corresponding to the elevator; according to the operating status, the power failure emergency controller 70 controls the circuit of the energy storage device 50, so as to realize the energy transfer between the energy storage device 50 and the elevator inverter 20. It can be understood that the operating status refers to the speed at which the elevator completes the operation, the stopping floor, and other elevator-related information or a combination of one or more.

[0022] In addition to the case of a power outage in the power grid, in the case of normal operation of the power grid, in order to avoid the energy generated by the traction machine 10 being consumed by the braking resistor, the control method of the elevator energy-saving emergency rescue device also includes: Determine the operating condition of the traction machine 10; If the traction machine 10 is in a braking state, the bidirectional DC-DC converter 40 automatically detects the braking state, and the bidirectional DC-DC converter 40 stores the energy generated by the traction machine 10 in the energy storage device. The braking state is that the total weight of the elevator car is less than the weight of the elevator counterweight and the elevator is running upward, or the total weight of the elevator car is greater than the weight of the elevator counterweight and the elevator is running downward. If the traction machine 10 is in the traction working state, the bidirectional DC-DC converter 40 automatically detects the braking working state, and the bidirectional DC-DC converter 40 releases the energy stored in the energy storage device to the DC bus terminal of the elevator inverter 20. The traction working state is that the total weight of the elevator car is greater than the counterweight weight of the elevator and runs upward, or the total weight of the elevator car is less than the counterweight weight of the elevator and runs downward.

[0023] In this embodiment, if the traction machine 10 is in a traction condition and the power required by the traction machine 10 exceeds the power of the bidirectional DC-DC converter 40, power is taken from the power grid of the elevator through the elevator inverter to utilize the power of the power grid of the elevator to meet the normal operation of the elevator; in addition, if the energy storage device is insufficient, power is taken from the power grid through the elevator inverter to meet the normal operation of the elevator.

[0024] If the traction machine 10 is in a braking condition and the energy storage device 50 has sufficient power, the excess power will be consumed through the braking resistor; if the traction machine 10 is in a braking condition and the energy generated by the traction machine 10 is greater than the power of the bidirectional DC-DC converter 40, the excess power will be consumed through the braking resistor.

[0025] Compared with the prior art, the energy generated by the traction machine 10 during braking is stored in the energy storage device 50 through the bidirectional DC-DC converter 40, and is released from the energy storage device 50 through the bidirectional DC-DC converter 40 when the traction machine 10 is in the traction condition, which greatly improves the energy saving rate of the elevator. At the same time, when the elevator is powered off, the energy stored in the energy storage device 50 is also used for automatic emergency rescue of the elevator. The power failure emergency controller 70 inverts the energy stored in the energy storage device 50 through the DC-AC inverter 60 and uses it to power the elevator. The elevator automatically opens the door after running to the level floor, and the trapped people can evacuate by themselves, which improves the safety of the elevator during power failure.

[0026] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elevator energy-saving emergency rescue device, characterized in that: include: Traction machine, elevator inverter, bidirectional DC-DC converter, energy storage device, DC-AC inverter, elevator controller and power failure emergency controller; The high voltage side of the bidirectional DC-DC converter is connected to the DC bus of the elevator inverter, and the low voltage side of the bidirectional DC-DC converter is connected to the energy storage device; The energy storage device is used to store the energy generated when the traction machine is working; The DC side of the DC-AC inverter is connected to the energy storage device, and the AC side of the DC-AC inverter is connected to the AC input terminal of the elevator frequency converter, and the elevator frequency converter is used to control the main circuit; The power outage emergency controller is connected to the DC-AC inverter, and is used to control the DC-AC inverter to invert the DC power in the energy storage device into AC power when a power outage is detected in the power grid, and transmit the inverted AC power to the AC input end of the elevator inverter and the elevator controller, so that the elevator controller runs the elevator to the level floor and opens the car door.

2. An elevator energy-saving emergency rescue device according to claim 1, characterized in that: The DC-AC inverter is a three-phase inverter or a single-phase inverter.

3. The elevator energy-saving emergency rescue device according to claim 1, characterized in that: The energy storage device is any one of a super capacitor, a battery and a nano capacitor.

4. The elevator energy-saving emergency rescue device according to claim 1, characterized in that: The DC-AC inverter is connected to the high-voltage DC bus of the bidirectional DC-DC converter and is used to obtain electric energy from the high-voltage DC bus of the bidirectional DC-DC converter.

5. A control method for an elevator energy-saving emergency rescue device, characterized in that: The elevator energy-saving emergency rescue device used in any one of claims 1 to 4 comprises: If it is detected that the power grid corresponding to the elevator is out of power, the DC-AC inverter is controlled to invert the direct current in the energy storage device to obtain alternating current; Transmitting the AC power to the AC input terminal of the elevator inverter and the elevator controller; When the elevator is out of power, the power outage emergency controller controls the elevator to run to a target floor and opens the car door. The target floor is the nearest floor to which the elevator corresponds when the power grid to which the elevator corresponds is out of power.

6. The control method according to claim 5, characterized in that: The method further comprises: Determine the working condition of the traction machine; If the traction machine is in a braking working state, the bidirectional DC-DC converter automatically detects the braking working state, and the bidirectional DC-DC converter stores the energy generated by the traction machine in the energy storage device, and the braking working state is that the total weight of the elevator car is less than the weight of the elevator counterweight and the elevator is running upward, or the total weight of the elevator car is greater than the weight of the elevator counterweight and the elevator is running downward; If the traction machine is in the traction working state, the bidirectional DC-DC converter automatically detects the braking working state, and the bidirectional DC-DC converter releases the energy stored in the energy storage device to the DC bus terminal of the elevator inverter. The traction working state is that the total weight of the elevator car is greater than the counterweight weight of the elevator and runs upward, or the total weight of the elevator car is less than the counterweight weight of the elevator and runs downward.

7. The control method according to claim 5, characterized in that: The controlling the DC-AC inverter to invert the direct current in the energy storage device to obtain alternating current includes: Determining the operating voltage corresponding to the elevator; The DC-AC inverter is controlled according to the operating voltage to invert the direct current in the energy storage device to obtain the alternating current.

8. The control method according to claim 6, characterized in that: The method further comprises: If the power required by the traction machine exceeds the power provided by the bidirectional DC-DC converter when the traction machine is in traction operation, power is taken from the power grid of the elevator through the elevator inverter to meet the normal operation of the elevator; If the traction machine is in the traction condition and the energy storage device is insufficient in power, the elevator inverter is used to draw power from the power grid to meet the normal operation of the elevator.

9. The control method according to claim 6, characterized in that: The method further comprises: If the traction machine is in a braking condition and the energy storage device has sufficient power, the excess power will be consumed by the braking resistor; If the traction machine is in a braking condition and the energy generated by the traction machine is greater than the power of the bidirectional DC-DC converter, the excess power will be consumed through the braking resistor.

10. The control method according to claim 5, characterized in that: When the elevator is powered off, the power outage emergency controller controls the elevator to run to the target level including: Determining the operating status corresponding to the elevator; According to the operating status, the power outage emergency controller is controlled to invert the electric energy stored in the energy storage device into alternating current through the DC-AC inverter for emergency operation of the elevator, thereby realizing the transfer of energy between the energy storage device and the elevator frequency converter. The operating status refers to one or more combinations of the speed at which the elevator completes its operation, the stopping floor, and other elevator-related information.

Images