China's elevator industry is developing rapidly. While the elevator industry is developing rapidly, high power consumption cannot be ignored. According to incomplete statistics, among the more than 600,000 elevators in use in the country in 2013, energy-saving elevators accounted for only 1.92%. By 2015, if all elevators in the country are still using non-energy-saving elevators, our elevators will consume about 80 billion kwh more electricity, which is equivalent to the annual power generation of the Three Gorges Power Station. The figures show how important it is for elevators to save energy. The following is an introduction to six ways to save energy in elevators and six new energy-saving technologies.
Single well double car running technology
In order to improve the efficiency of lifts and the utilization of hoistways in high-rise buildings, single-track dual-car technology has emerged in recent years. According to the car position and operating conditions, it can be divided into three types: Super Double-Side Conjoined Car, Adjustable Double-Car Link and Double Car.
The single well double car technology works on the basis of two independent cars in the same hoistway. The intelligent control system monitors the positions of the two cars through sensors to prevent collisions and make it safe for independent operation. And to increase the capacity to achieve energy savings.
Target selection intelligence
Through the efficient operation and scheduling of the intelligent diversion mode at the destination layer, it is possible to effectively improve the elevator operation efficiency and reduce the time required for passengers to wait for a ladder or to take a taxi.
The purpose-selection layer intelligence technology consists of group control unit, destination layer selector and floor indicator module. It is based on expert system, fuzzy logic and neural network control technology. It has a dynamic decentralized standby, peak self-identification, and dynamic partitioning service. Configure service layer, deployment strategy selection and timely forecasting.
Wireless power transmission and wireless signal transmission technology
By means of wireless power transmission and wireless signal transmission, the elevator car is free of accompanying elevators, which can not only save the elevator but also improve the load balance, signal interference, safety performance and other safety and energy saving issues of the elevator.
The elevator car accompanying the elevator connects the car and the control cabinet of the elevator room to transmit power and signals. Through the interaction of transformers at each level of the shaft wall and at the top of the car, the frequency of the current is increased, and a high-frequency magnetic field is generated in the magnetic core coil. When the secondary coil of the car approaches, an inductive current is generated, and then rectified into a direct current to charge the battery, as the power supply for the elevator car and the landing door.
The elevator car side switch signal is collected by the original signal acquisition device, then hard-wired to the car side wireless signal transmission device, the antenna transceiver sends the signal to the landing door side wireless signal transmission device, and then the signal is transmitted through the cable. Connect to the monitoring center. The opposite of the switch signal line from the monitoring center to the elevator car. In this way, the work of the elevator car to transmit wireless signals without the accompanying elevator is completed, so as to achieve the safety and energy saving of the elevator operation.
Optimize pair reconfiguration
The average load ratio of the elevator is about 20% of the rated load, and the currently recognized elevator balance coefficient is 40%-50%. After a large number of tests and analysis, the industry suggested that the balance coefficient can be optimized as 0.35 for traction drives, 0.21 for energy regeneration devices, and 0.30 for hydraulic elevators, indicating that optimized counterweight configuration can also reduce elevator energy consumption during operation.
In the elevator energy feedback, the energy recovery is generally 20%-40% due to the type of ladder, frequency of use, and load capacity. At present, the national energy consumption standards for elevators have not yet been issued. The energy feedback energy saving is the use of PWM active inverter in the elevator voltage inverter original resistance braking unit terminal ERB device installed to achieve the effect of energy feedback, this method is suitable for heavy load, high frequency of use of the elevator .
Reasonably optimize the selection and management of elevators
According to the nature of the building, service targets, use area, flow rate and destination, etc., a reasonable configuration of elevator layout, quantity, operation, and parking layout can achieve energy-saving effects and is the most practical approach.
The linear motor can directly convert electric energy into linear motion mechanical energy without any conversion device. A linear motor-driven linear elevator, which was put into use in Tokyo, Japan in 1990, has a carrying capacity of 600kg, a speed of 1.75m/s and an elevated height of 22.90m.
A new generation of linear motor-driven, ropeless elevators without machine room, counterweight and traction steel ropes, have the advantages of simple structure, easy maintenance, no noise, no pollution and 60% energy saving.
Therefore, the linear motor-driven traction rope-free elevator may become the development direction of elevators in high-rise buildings in the future.
At present, China has become the country that promotes and uses energy-efficient elevators the most in the world. The relevant departments indicated that they will promote the popularization of energy-efficient elevators nationwide within a certain period of time. According to the survey, if energy-saving elevators are first applied in government buildings and public buildings of government offices and public buildings, the power of these elevators in the state of power generation can be recycled, and savings can be saved by 9 billion yuan per year based on average energy saving rate of 30%. Degree of electricity. The promotion task of elevator energy-saving technology is arduous, but its future is bright.
This paper tags: Energy-saving elevators Energy-saving elevators Energy feedback Elevators