32 fields of Inverter Application
32 fields of Inverter Application
1 air conditioning load
2 crusher load
Many crushers and ball mills are used in metallurgical mines, building materials and other industries, and the effect is remarkable after frequency conversion.
Three. Load of calciner in large kiln
In the past, large industrial rotary kilns (converters) such as metallurgy, building materials and caustic soda used DC, commutator, differential motor, cascade speed regulation or intermediate frequency unit. In recent years, many units have adopted frequency conversion control, and the effect is very good.
4 compressor load
Compressors are also widely used loads. Low pressure compressor is widely used in various industrial departments, high-pressure and large capacity compressors are widely used in iron and steel (such as oxygen generator), mining, chemical fertilizer, ethylene and other industries. The frequency conversion speed regulation has the advantages of small starting current, energy saving and optimizing the service life of equipment.
5 mill load
In the metallurgical industry, the AC-DC-AC converter was used in large rolling mills in the past. In recent years, AC-DC-AC converter has been applied in large rolling mill. AC-DC-AC converter has been applied to light load rolling mill, such as Ningxia aluminum mill with multiple stands, which can meet the requirements of low frequency on load start, synchronous operation between stands, constant tension control, simple and reliable operation.
6 hoist load
The winch load adopts frequency conversion speed regulation, which is stable and reliable. Blast furnace lifting equipment in iron making plant is the main conveying equipment of iron making raw materials. It is required to start and brake smoothly, accelerate and decelerate evenly, and have high reliability. In the past, series, DC or rotor series resistance speed regulation is adopted, which has low efficiency and poor reliability. The ideal speed regulation effect can be obtained by replacing the above-mentioned speed regulation with AC frequency converter.
7 inverter load
The converter load is simple, reliable and stable by replacing DC unit with AC frequency conversion.
8 roller load
Roller load, mostly in the steel industry, adopts AC motor frequency conversion control, can improve the reliability and stability of the equipment.
9 pump load
The pump has large load, large quantity and wide range, including water pump, oil pump, chemical pump, mud pump, sand pump, etc., and has low pressure and medium capacity pump and high-pressure and large capacity pump.
Water companies, chemical fertilizer industry, reciprocating pumps, non-ferrous metal mud pumps and other industries of water pumps are mostly frequency conversion speed regulation, and achieved good results.
10 crane and dumper loads
The load torque of crane and dumper is large, and the requirements are stable and the positive and negative frequency are reliable. The inverter can control the crane and dumper to meet these requirements.
11 load of wire drawing machine
The drawing machine for producing steel wire requires high-speed continuous production. The strength of steel wire is 200kg/mm2, and the speed regulating system requires high precision, high stability and synchronization.
12 load of transport vehicle
The results show that the frequency conversion speed regulation technology is very effective in coal mines or steel plants. It has the advantages of fast start and stop, strong overload capacity, flexible positive and reverse direction, smooth coal surface, correct weight (less or less loading), and it basically does not need manual operation, improves the production efficiency of raw coal and saves power.
13 load of elevator overhead traveling vehicle
Because elevator is a tool for carrying people, it requires high reliability of drive system, and also requires frequent acceleration and deceleration and forward and reverse rotation. The improvement of dynamic characteristics and reliability of elevator improves the safety, comfort and efficiency of elevator. In the past, most elevators used DC speed regulation, in recent years, they have gradually changed to AC motor frequency conversion speed regulation, whether in Japan or Germany. Many elevator factories in China are scrambling to provide the elevator with frequency conversion speed regulation. For example, Shanghai Mitsubishi, Guangzhou Hitachi, Qingdao Fuji, Tianjin Otis and so on all adopt AC frequency conversion speed regulation. Many of the elevators produced in the original have also been frequency conversion transformation.
14 feeder load
In metallurgy, power, coal, chemical industry, there are many feeders. Whether it is a disc feeder or a vibrating feeder, the effect of frequency conversion speed regulation is very significant. The disc feeder of sulfuric acid production line of Jihua company adopts slip speed regulation, low frequency torque is small, fault is more and clogging is frequent. After adopting frequency conversion speed regulation, because of asynchronous motor, it has high reliability and power saving. More importantly, it is closed-loop with temperature transmitter to ensure the accuracy of material transportation, avoid accidents caused by too high temperature of oxidant transportation, and ensure orderly production.
15 stacker reclaimer type load
Stacker reclaimer is the main equipment for stacking materials in coal yard, wharf, mine and so on. Its main function is stacking and recycling. The automatic stacking and semi-automatic material collection are realized. The reliability of the equipment is improved. The equipment is stable in operation without impact and shaking. Press φ 1. Recovery process adjustment. The efficiency of bucket wheel rotating material extraction is improved, and the uniformity of coal transportation is improved. It is very popular with workers.
16 fan load
Fan is a large load equipment, widely used in steel plants, power plants, non-ferrous metals, mines, chemical industry, textile, chemical fiber, cement, paper industry and other industries. Most of them use adjustable baffle opening to adjust air volume, which wastes a lot of electric energy. Frequency conversion speed regulation can save power, reduce mechanical wear and prolong the service life of equipment.
17 mixer load
There are many mixers in the chemical and pharmaceutical industries. There are many advantages in replacing other speed regulation methods with frequency conversion.
18 spinning machine load
Spinning process is complex, there are many stations, which require tension control, and some stations need position control. The frequency conversion speed regulation effect is good.
19 special power load
The experimental power supply, aircraft drag power supply (400Hz) and other power supplies can be completed by frequency conversion device. It has the advantages of less investment, quick effect, small volume, simple operation and so on.
20 paper machine load
The precision of paper machine is required by paper industry in China. SCR DC speed regulation is mostly adopted, and slip motor and commutator motor are used in some parts. Due to the existence of slip ring and carbon brush, its reliability and accuracy are not high. This leads to the backward of paper machine. The general speed is only about 200m/min, which is difficult to compare with that of foreign countries. Therefore, the paper machine frequency conversion speed regulation is the general trend.
21 load of washing and ironing equipment
In the past, the washing machine and ironing equipment in large hotels used mechanical speed regulation or variable pole speed control, which can only provide one or several speeds, which is not ideal for fabrics requiring repeated washing and ironing. The efficiency of washing machine is greatly improved by adopting frequency conversion speed regulation.
22 music fountain load
The water level and water volume of music fountain are controlled by frequency conversion, which attracts tourists very much.
23 grinding machines and other mechanical loads
The spindle speed of grinder is very high, and the power frequency is also very high, including 200Hz, 400Hz and even 800Hz. In the past, the main shaft motor power supply was mostly driven by if generator sets. If unit is large in volume, low in efficiency, noisy and poor in accuracy.
24 cigarette machine load
In the past, cigarette machines imported, whether it is Molin 8 or Molin 0, are not stepless speed regulation. Therefore, in the cigarette industry, it mainly solves the stepless speed regulation and reliability problems, which is simple in technology, simple in frequency converter and has great effect.
25 load of vibration reduction and noise reduction
Many loads, such as large air compressor and medium frequency unit, have large noise and vibration. Frequency conversion technology can reduce vibration and noise and meet the standard.
26 printing and dyeing machine load
Most printing and dyeing machines are multi-unit equipment. In this process, each unit is required to operate synchronously at the same line speed and maintain constant tension. Otherwise, there will be quality problems such as broken cloth, cloth wrapping, uneven color, insufficient color and too large shrinkage. In the past, the DC speed regulating system was used in the common power supply and the split power supply mode of printing and dyeing machinery.
Due to the inherent shortcomings of DC, the printing and dyeing industry gradually adopts AC frequency conversion technology. The circular screen printing machine is composed of cloth feeding unit, printing unit, drying room guide unit and falling unit, which belongs to a complex printing and dyeing speed control system. The speed chain is controlled by frequency conversion. The synchronization performance is good, the precision is high, and the reliability is high.
27 injection molding machine load
Injection molding machine is the key equipment of plastic processing and molding, which has large quantity and high power consumption. Most of the energy saving methods in the past have changed from delta type to Y type (star type), with general effect. The pressure of the original injection molding machine can be maintained, such as keeping the injection molding machine not shut down, not stopping, and so on, which can replace the throttle and speed regulation mode of the original proportional valve, greatly reducing the energy consumption. Many injection molding plants in Pearl River Delta have been transformed with frequency conversion. When reforming the injection molding machine, attention should be paid to the acceleration of the closing speed, otherwise the output will be reduced, and the harmonic interference at the input and output ends shall be noticed.
28 environmental protection load such as sewage treatment
The environmental protection related to human living environment is paid more and more attention. Green energy appears in cities. Frequency conversion speed regulation can be used in three aspects of environmental load. First, industrial sewage treatment, second is garbage power plant, and the third is to control industrial smoke exhaust, exhaust and dust removal.
29 load of glass, ceramics, medicine, beverage, food, packaging and other production lines
The production lines of glass, ceramics, pharmaceutical, beverage, food and packaging adopt frequency conversion speed regulation, and have achieved good results.
30 offshore platform load
The frequency conversion speed regulation of AC motor for oil drilling is far better than that of DC, especially in dust and dust, because the AC motor is reliable. The frequency conversion speed regulating device is required for offshore oil drilling platform.
31 electric submersible pump load
Electric submersible pump is a kind of oil production method in oil field. Most of the electric submersible pumps work in wells below 1800m, and most of them are started at full pressure and operated at constant speed, which have the following disadvantages:
? The starting current is too high to damage the motor insulation
? Impact moment is generated, which damages the pump structure;
? The pump suddenly produces a large suction force, it is easy to inhale sand particles, causing the pump to jam. Because of the absence of voltage stabilizing system, the underground liquid level fluctuates greatly, resulting in instability of voltage and current, resulting in over excitation and under excitation of submersible motor, and causing failure.
32 polyester chip load
Polyester chip is one of the main products of petrochemical industry. Because of the high precision of frequency conversion, it is easy to control multiple control points, and it is stable and reliable. After adopting frequency conversion speed regulation, the product quality can be improved and great benefits will be brought to the enterprise. Many enterprises adopt frequency conversion technology in capacity expansion.