Generally, according to the machine gas production 10-20% to choose, or according to the customer terminal gas consumption 120% to choose, there is no fixed value, air compressor tanks play the role of cooling, buffering, sewage, so, greater pressure fluctuations can be appropriately increased, Climate hot areas (Middle East, North Africa, etc.) can be appropriately increased.

Power frequency; in addition to 7.5 kW is a direct start, more than 7.5 kW power frequency using star triangle start, power frequency also has soft start (SOFT START) mode, need to be equipped with soft starter. Frequency conversion: frequency conversion start, in fact, is also a soft start mode, frequency converter start is to change the frequency of the start mode, starting torque is large, the soft-start is decompression start, not suitable for large load system.

Compared with power frequency, the frequency conversion machine has many advantages. It can reduce impulse current and prolong motor life. It can adjust the motor frequency according to actual gas consumption and save up to 30% of electric energy. Can provide pressure stable air for gas equipment, the disadvantage is high cost, maintenance cost.

There are generally IP23,IP55/IP65, power frequency IP23/IP55, our company generally choose IP55, one air-cooled frequency conversion only IP23, split frequency conversion general choice, and oil-cooled motor (are one), belong to the IP65.

We generally configure air dryer power supply belongs to 220 v50hz, single-phase electricity, some countries 220 v60hz, but belong to three-phase electricity, receive single-phase words is 127 v or so, can not use, so encounter voltage grade and China is different customer, want to inquire clearly, What is the voltage level? The air dryer is to single-phase, dual-phase or three-phase.

When the air compressor is running, about 15% of the energy is converted into air potential energy and 85% into heat energy, so it is very necessary to recycle heat. Recycled heat can be used to make hot water, for bathing, boiler water preheating, heating heat, and so on, saving a lot of energy.

Belt connection is to use pulley and belt, motor drive mainframe, its advantage is that it can adjust speed through the proportion of pulley, prevent accidental blocking, burn out the motor, save housing space, the disadvantage is easy to slip, transmission efficiency is low, Direct connection is to connect mainframe and motor through the coupling.

Oil-free screw machine and fuel injection screw mechanism are almost the same, but do not need to lubricate the rotor, is the rotor surface coated with special materials, wear-resistant, the two screws are engaged, through bipolar compression, the air pressure to set pressure, the pressure is slightly smaller, the screw blower is different, the two screws are not engaged, but driven by gears, because of the different structure, the compression ratio is very small, so the blower pressure is very small, but the air volume is very large.

After the air compressor is discharged, the gas storage tank, cold dryer, and precision filter, dryer are all reprocessing equipment.

The formula of synchronous speed and frequency of the motor is:

n=60 f/p

n= speed of the motor (rpm);

60—— Number of seconds per minute (seconds);

f—— frequency (hertz);

p——Pole logarithm of rotating magnetic field of motor

The rotational speed of the rotating magnetic field is only related to the logarithm of the magnetic pole. The rotational speed of the rotating magnetic field is low:

The pole logarithm p=1, the rotational speed of the rotating magnetic field n=3000;

The pole logarithm p=2, the rotational speed of the rotating magnetic field n=1500;

The pole logarithm p=3, the rotational speed of the rotating magnetic field n=1000;

The pole logarithm p=4, the rotating speed of the rotating magnetic field n=750;

Therefore, when the voltage level is 60hz, according to the formula, the synchronous speed of the motor will increase compared with the speed of 50hz, the speed of the main engine will increase, and the required shaft power will increase. So sometimes change the main engine to match the motor, so the gas production will be different.

When it comes to laser cutting air compressors, many laser cutting users may have questions about how to choose the type of air compressor to match the laser cutting machines correctly.

Generally from the exhaust volume, we should choose a larger air compressor than the actual use, but do not blindly pursue the air volume, if the air compressor exhaust volume is too large, much larger than the actual demand, even if the air compressor has frequency conversion regulation, It may cause air compressor to run at the lowest frequency.

In order to maintain the stability of gas supply pressure, once the gas continues, the air compressor has to start operation. Such frequent "start-working-dormancy-start-working-dormancy ", easy to cause bubbles and emulsification of lubricating oil in oil and gas separator, which will shorten the life of the air compressor and increase the oil content of the exhaust port.

In terms of pressure, when the laser power is large enough, the higher the pressure, the better the cutting quality and the higher the cutting efficiency. But if the laser power is not large enough, no matter how high the pressure will not help, after all, the laser power is large enough to melt the cutting material faster.

Also most importantly, the quality of compressed air has a very direct effect on the quality of laser cutting. The compressed air contains water mist and oil. If it is not treated clean, high pressure spray onto the protective mirror of the laser cutting head.

A superpower laser cutting machine may also burn out the laser head. At present in the industry, laser cutting machines launched special products. Usually, the micro-oil twin-screw and post-processing equipment are combined to form a complete air source system, which we call a four-in-one laser cutting air compressor.

According to some commonly used configuration, we take carbon steel as an example, roughly statistics the standard of selecting a special air compressor for laser cutting:

Laser cutting machine

Air compressor

Recommended cut thickness (carbon steel)

Less than 1.5 kW

11kw 16bar

2mm

Less than 3kw

15kw 16bar

4mm

Less than 6kw

15kw16bar(Atmospheric)

Less than 10kw

22kw 16bar

8mm

12-15kw

22/37kw 20bar

10-12mm