Talking about the scheme of applying SY4000 general frequency converter in compressor
Compressor introduction:
Compressor (compressor), a kind of driven fluid machinery that transports gas and increases gas pressure. It is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle to achieve Compression → condensation → expansion → evaporation (endothermic) refrigeration cycle. Compressors are divided into piston compressors and screw compressors. Piston compressors are generally composed of housing, motor, cylinder, piston, control equipment (starter and thermal protector) and cooling system. There are two cooling methods: oil cooling and natural cooling. The compressors of general household refrigerators and air conditioners use single-phase alternating current as a power source, and their structural principles are basically the same. The refrigerant used by the two is different. Compressors are widely used in industrial and mining enterprises. The capacity of electric motors is generally large, and most of them are continuously operated all year round, so there is great potential for power saving.
Common compressors have the following types according to different occasions:
(1) Air compressor—provide air power source to relevant equipment;
(2) Refrigeration compressor-used for freezing, cold storage, ice making, fresh keeping, etc.;
(3) Air-conditioning compressor-refrigeration, chilled water, etc.;
(4) Gas compressors-manufacturing oxygen, ammonia, hydrogen, nitrogen, etc.;
(5) Special compressor—such as coal gas, acetylene gas, etc.
The process flow of the air compressor is shown in Figure 1, and its working mode is the load of short-time work. Figure 2 No-load time T0, working time TP, general T0
Characteristics and power saving:
The air compressor (air compressor (English: air compressor) is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover (usually an electric motor) into gas pressure energy. It is a pressure generating device for compressed air. , The power saving rate N%=△n↓% is the percentage of the speed drop. And the power saving rate is generally ≤20%, when the speed drop is too much, it will cause the pulsation of the gas and form pressure fluctuations, which will occur at low speed If the air volume is too small, it is also necessary to consider whether the lubrication method is a separate oil pump or splash lubrication. In particular, the latter will cause cylinder heating and accelerated wear at low speeds. There are many types of air compressors, according to the working principle. Divided into positive displacement compressors, speed compressors, the working principle of positive displacement compressors is the volume of compressed gas, which increases the density of gas molecules per unit volume to increase the pressure of compressed air; the working principle of speed compressors is to increase The movement speed of the gas molecules converts the kinetic energy of the gas molecules into the pressure energy of the gas, thereby increasing the pressure of the compressed air.
In one sentence, it is impossible to meet the requirements of the process because of power saving. And to ensure the safety of the equipment as the premise, the working frequency is generally between 40 ~ 50Hz.
method of execution:
(1)Two-stage speed fixed frequency control-moderate and small power motor control, and the gas consumption is not large, that is, from full pressure to under pressure at time TQ>T, this method is more suitable. (2)Closed loop constant pressure control-suitable for medium and high power motor control, automatic speed regulation according to pressure changes. SY4000 series general-purpose inverters are suitable for constant torque or speed-regulated loads. They have good performance and have been used by many units.
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