Inverters can be used in 32 fields. How many do you know

Inverters can be used in 32 fields. How many do you know

1. Air conditioning load

　　 Office buildings, shopping malls, some supermarkets, and factories all have central air conditioners. During the peak of electricity consumption in summer, air conditioners consume a lot of electricity. In hot weather, air-conditioning power consumption in Beijing, Shanghai, and Shenzhen all account for more than 40% of peak power. Therefore, using a frequency conversion device to drive the refrigeration pump, cold water pump, and fan of the air conditioning system is a very good power saving technology. At present, many companies specializing in short-selling electricity regulation have emerged across the country, and the main technology is frequency conversion speed regulation and electricity saving.

　　2, crusher load

　　 Many crushers and ball mills are used in metallurgical mines and building materials. The effect of frequency conversion for this type of load is remarkable.

　　3, large kiln calciner load

　　 Metallurgy, building materials, caustic soda and other large-scale industrial rotary kilns (converters) used mostly DC, commutator motors, slip motors, cascade speed control or intermediate frequency unit speed control in the past. Because these speed regulation methods may have slip rings or low efficiency, in recent years, many units have adopted frequency conversion control with excellent results.

　　4, compressor load

　　 Compressors are also widely used loads. Low-pressure compressors are commonly used in various industrial sectors, and high-pressure large-capacity compressors are widely used in steel (such as oxygen generators), mines, fertilizers, and ethylene. The use of frequency conversion speed regulation brings advantages such as low starting current, energy saving, and optimization of equipment service life.

　　5, rolling mill load

In the metallurgical industry, in the past, large-scale rolling mills used AC-AC inverters. In recent years, AC-DC-AC inverters have been used. AC conversion of rolling mills has become a trend, especially in light-load rolling mills, such as the multi-stands of Ningxia National Aluminum Products Factory. The aluminum rolling mill adopts a general-purpose frequency converter to meet low-frequency load starting, synchronous operation between stands, constant tension control, simple and reliable operation.

　　6, hoist load

　　The hoist load adopts frequency conversion speed regulation, which is stable and reliable. The blast furnace hoisting equipment of the iron plant is the main ironmaking raw material conveying equipment. It requires smooth starting and braking, uniform acceleration and deceleration, and high reliability. In the past, cascade, DC or rotor series resistance speed regulation methods were mostly used, which has low efficiency and poor reliability. Using AC frequency converter to replace the above-mentioned speed regulation method can achieve ideal results.

　　7, converter load

　　 Converter load, replacing DC unit with AC frequency conversion is simple, reliable and stable.

　　 8. Roller type load

　　 Roller table loads, mostly in the steel and metallurgy industry, adopt AC motor frequency conversion control, which can improve equipment reliability and stability.

　　9, pump load

　　Pump load, with a large volume and a wide range, including water pumps, oil pumps, chemical pumps, mud pumps, sand pumps, etc. There are low pressure medium and small capacity pumps, as well as high pressure large capacity pumps.

　　Many water pumps in water companies, chemical pumps in the chemical and fertilizer industries, reciprocating pumps, and mud pumps in non-ferrous metal industries use variable frequency speed regulation, all of which produce very good results.

　　10, cranes, dump trucks and other loads

　　The load torque of cranes and dump trucks is large and stable, and the positive and negative are frequent and reliable. Frequency conversion devices control cranes and dump trucks can meet these requirements.

　　11, wire drawing machine load

　　The wire drawing machine for producing steel wire requires high-speed and continuous production. The steel wire strength is 200Kg/mm2, and the speed control system requires high precision, high stability and synchronization.

　　12、Transport vehicle load

　　 The use of frequency conversion technology for coal loading trucks in coal mines or molten steel trucks in steel mills is very effective. Quick start and stop, strong overload capacity, flexible forward and reverse rotation, to achieve a flat coal surface and correct weight (no more or less loading), basically no manual operation is required, which improves the production efficiency of raw coal and saves electricity.

　　 13. Elevator overhead tourist car load

　　 Because the elevator is a manned tool, the driving system is required to be highly reliable, and frequent acceleration, deceleration, and forward and reverse rotation are required. The improvement of the dynamic characteristics and reliability of the elevator increases the safety, comfort and efficiency of the elevator. In the past, elevator speed control was mostly DC. In recent years, it has gradually changed to AC motor variable frequency speed control, whether in Japan or Germany. Many elevator factories in China are scrambling to equip elevators with frequency conversion speed regulation. For example, Shanghai Mitsubishi, Guangzhou Hitachi, Qingdao Fuji, Tianjin Otis, etc. all adopt AC frequency conversion speed control. Many elevators originally produced have also undergone frequency conversion transformation.

　　14, feeder load

　　 There are many feeders in metallurgy, electric power, coal, chemical and other industries. Whether it is a disc feeder or a vibrating feeder, the effect of frequency conversion speed regulation is very significant. The disc feeder of the sulphuric acid production line of Jilin Chemical Company’s dye plant was originally designed for slip speed regulation, with small low-frequency torque, many failures, and frequent jamming. After adopting frequency conversion speed regulation, because it is an asynchronous machine, it has high reliability and energy saving. More importantly, the closed loop with the temperature transmitter ensures the accuracy of the conveyed materials, and prevents accidents caused by excessive and over-temperature conveying of oxidant, ensuring production The orderliness.

　　 15, stacker and reclaimer load

　　 Stacker-reclaimer is the main equipment for stacking and reclaiming materials in coal yards, docks, and mines. The main function is stacking and reclaiming materials. The realization of automatic stacking and semi-automatic reclaiming improves the reliability of the equipment, and the equipment runs smoothly without impact and shaking. The reclaiming process is rotated according to the 1/cosφ rule, which improves the efficiency of bucket wheel reclaiming and the belt conveying coal. Uniformity is very popular among workers.

　　16, fan load

　　 Fan load is a wide range of equipment, steel mills, power plants, non-ferrous metals, mining, chemical, textile, chemical fiber, cement, paper and other industries. Most of them use adjusting the opening of the baffle to adjust the air volume, which wastes a lot of electric energy. Using frequency conversion speed control can save electricity and reduce mechanical wear and extend the life of the equipment.

　　17, mixer load

　　 There are a lot of mixers in the chemical and pharmaceutical industries. The use of frequency conversion speed control instead of other speed control methods has many advantages.

　　18, spinning machine load

　　The spinning process is complicated, with many stations, requiring tension control, and some requiring position control. The frequency conversion speed regulation effect is good.

　　19, special power load

　　Many power supplies, such as experimental power supplies and aircraft drag power supplies (400Hz) can be completed with frequency conversion devices. The advantages are low investment, quick results, small size and simple operation.

　　20, paper machine load

　　 The paper machines in my country's paper industry mostly use SCR DC speed regulation methods that require high precision, and some use slip motors and commutator motors. Due to the existence of slip rings and carbon brushes, the reliability and accuracy are not high. As a result, the papermaking machinery is backward, and the general speed is only about 200m/min, which is difficult to compare with 2000m/min abroad. Therefore, the frequency conversion of papermaking machinery is the general trend.

　　21, laundry equipment load

　　 In the past, washing machines and ironing equipment in larger hotels mostly used mechanical speed regulation or pole-changing speed regulation, which could only provide one speed or several speeds, which is not ideal for fabrics that require repeated washing and ironing. Using frequency conversion speed regulation, greatly improving the efficiency of the washing machine.

　　 22, musical fountain load

　　 is a musical fountain that attracts tourists very much. The height and volume of the water are controlled by frequency conversion.

　　23, mechanical load such as grinder

　　The spindle of the grinder is concerned about the high speed, and the frequency of the power supply is also high, including 200Hz, 400Hz or even 800Hz. In the past, the power supply of the spindle motor was mostly driven by an intermediate frequency generator set. The intermediate frequency unit is large in size, low in efficiency, noisy, and poor in accuracy.

　　24, cigarette machine load

　　 The cigarette machines imported by the cigarette industry in the past, whether Maureen 8 or Maureen 0, are not stepless speed regulation. Therefore, in the cigarette industry, it is mainly to solve the problem of stepless speed regulation and reliability. The technology is simple, the frequency converter is simple to use, and the effect is great.

　　 25, vibration reduction and noise reduction load

　　Many loads, such as large air compressors, intermediate frequency units, etc. have high noise and vibration. Using frequency conversion technology can reduce vibration and noise, within the standard.

　　26, printing and dyeing machine load

　　Most printing and dyeing machinery are multi-unit joint work equipment. The technology requires all units to run synchronously at the same linear speed and maintain a constant tension, otherwise quality problems such as cloth breakage, entanglement, uneven chromaticity, insufficient chromaticity, and excessive shrinkage will occur. In the past, printing and dyeing machinery adopts DC speed control system whether it is a common power supply mode or a sub-power supply mode.

　　 Because of the inherent shortcomings of DC, the printing and dyeing industry gradually adopts AC frequency conversion technology. The rotary screen printing machine is composed of a cloth feed unit, a printing unit, a drying room guide belt unit and a cloth drop unit. It is a complex type of printing and dyeing speed control system. Using frequency conversion speed control to form a speed chain control. Good synchronization performance, high precision and high reliability.

　　27, injection molding machine load

　　Injection molding machine is the key equipment for plastic processing and molding. It has a large number and high power consumption. In the past, most energy-saving methods used delta (triangle) type (triangle type) to Y type (star type) to save electricity. Using frequency conversion speed regulation does not change the original structure of the injection molding machine, and controls the pressure or flow of the oil pump in several processes (such as mold clamping, mold clamping, injection, pressure holding, demolding, mold ejection, etc.), which can save power by 20% to 52 %, it has better replaced the past proportional valve throttling speed regulation method, and greatly reduced energy consumption. Many injection molding plants in the Pearl River Delta have carried out frequency conversion transformation. When transforming the injection molding machine, pay attention to the acceleration of mold clamping, otherwise the output will be reduced, and pay attention to the harmonic interference of the input and output ends.

　　28, environmental protection load such as sewage treatment

　　Environmental protection is paying more and more attention, and it is related to the environment on which humans depend. So clean energy and green cities have appeared. Variable frequency speed regulation can be used in three aspects of environmental protection loads. The first is industrial sewage treatment, the second is garbage power plants, and the third is the control of industrial smoke, exhaust, and dust removal.

　　29, glass, ceramics, pharmaceutical, beverage, food, packaging and other production lines load

　　The production lines of glass, ceramics, pharmacy, beverage, food, packaging, etc. adopt frequency conversion speed regulation, all of which have achieved good results.

　　30, offshore oil production platform load

　　 The use of AC motor frequency conversion speed regulation in oil drilling is much better than DC speed regulation, especially in places with windy sand and dust, because the AC motor is reliable. Offshore oil drilling platforms require variable frequency speed regulation devices.

　　31, electric submersible pump load

　　Electric submersible pumping is a method of oil field extraction. Electric submersible pumps mostly work in oil wells below 1800m. Most of them use power frequency full pressure start and constant speed operation. They have the following disadvantages:

　　 Excessive starting current will damage the motor insulation

　　 produces impact torque and damages the pump structure;

　　 The pump suddenly produces a large suction force, which is easy to suck in sand, causing the pump to jam. In addition, there is no voltage-stabilizing system and large fluctuations in the downhole liquid level, resulting in unstable voltage and current, causing the submersible motor to be over-excited and under-excited, causing malfunctions.

　　32, polyester chip load

　　 Polyester chips are one of the main products in the petrochemical industry. Due to the high precision of frequency conversion speed regulation, it is convenient for multiple control points to control, stable and reliable, and the use of frequency conversion speed regulation can increase product quality and bring great benefits to enterprises. Many companies use frequency conversion technology when expanding capacity.