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The working principle of screw air compressor and the advantages of frequency conversion air compressor! Learn about

  • Categories:Industry News
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  • Time of issue:2020-11-30 13:30
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(Summary description)   At present, the air compressor adopts two-point control (upper and lower limit control) or start-stop control (small air compressor), that is, when the pressure in the compressed gas cylinder reaches the upper limit of the set value, the air compressor passes its own air pressure Or the oil pressure closes the intake valve and the small air compressor stops. When the pressure drops to the lower limit of the set value, the air compressor opens the intake valve, and the small air compressor starts again. The traditional control method is easy to cause an impact on the power grid, and it also has certain damage to the air compressor itself, especially when the air consumption fluctuates frequently.

The working principle of screw air compressor and the advantages of frequency conversion air compressor! Learn about

(Summary description)   At present, the air compressor adopts two-point control (upper and lower limit control) or start-stop control (small air compressor), that is, when the pressure in the compressed gas cylinder reaches the upper limit of the set value, the air compressor passes its own air pressure Or the oil pressure closes the intake valve and the small air compressor stops. When the pressure drops to the lower limit of the set value, the air compressor opens the intake valve, and the small air compressor starts again. The traditional control method is easy to cause an impact on the power grid, and it also has certain damage to the air compressor itself, especially when the air consumption fluctuates frequently.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-11-30 13:30
  • Views:
Information

Working principle of screw air compressor

         At present, the air compressor adopts two-point control (upper and lower limit control) or start-stop control (small air compressor), that is, when the pressure in the compressed gas cylinder reaches the upper limit of the set value, the air compressor passes its own air pressure Or the oil pressure closes the intake valve and the small air compressor stops. When the pressure drops to the lower limit of the set value, the air compressor opens the intake valve, and the small air compressor starts again. The traditional control method is easy to cause an impact on the power grid, and it also has certain damage to the air compressor itself, especially when the air consumption fluctuates frequently.

   Under normal working conditions, the air is compressed into the air tank. The detection of each point of the air compressor (including compressed air temperature, pressure, screw temperature, cooling water pressure and temperature, oil pressure, oil temperature, etc.) and overall control are controlled by the main control single board computer. When the outlet pressure of the air compressor reaches the upper limit of the set value, the air inlet is closed through the oil pressure bypass valve, and the internal circulation pipeline is opened at the same time for self-circulation operation. At this time, the gas-consuming unit continues to use gas. When the pressure drops to the lower limit of the set value, the oil pressure bypass valve closes the circulation pipeline, opens the air inlet, and the air is compressed into the air tank by the filter. In the static state, the original starting mode (Y-△), and loading and unloading will cause great impact on the power supply and distribution equipment and the screw. Especially the serious waste of energy. The main motor speed drops, the shaft power will drop a lot. The energy saving potential is considerable.

The effect of variable frequency energy saving is very significant, especially for systems and equipment with a large adjustment range. Through practical applications, it can be intuitively seen that as long as the speed (frequency) changes when the flow changes, the shaft power will be increased to a greater extent. Because of this feature, the frequency conversion speed regulation (energy saving) method has become a trend and is continuously applied to various industries and various adjustment fields.


Control principle of frequency conversion screw air compressor


  

Air compressors generally have the following characteristics: the configured capacity is larger than the actual air volume, the air volume consumption is unstable, the air pressure requirement is stable, and the noise should be as low as possible (especially at night). The variable frequency air compressor automatically changes the speed of the main engine according to the amount of air used to reflect changes in system pressure and maintain a stable system pressure; when the air consumption of the system decreases; the amount of compressed air provided by the compressor will be greater than the consumption of the system. The inverter compressor will reduce the speed and output compressed air at the same time to maintain a stable system pressure value. If the air consumption of the system increases, the amount of compressed air provided by the compressor will be less than the consumption of the system at this time, the speed of the inverter compressor will be relatively increased, and the amount of compressed air will be output to maintain a stable system pressure value.
This mode of operation allows the inverter compressor to directly and quickly respond to system pressure changes and provide the air volume changes required for system consumption. Through this mode of operation, the inverter compressor can maintain between the output air volume and energy consumption The best operating efficiency.


Advantages of variable frequency screw air compressor


  

   Advantage 1: You can remotely control the frequency conversion air compressor

  Using advanced control, monitoring and communication systems, through the Internet, users can conveniently obtain timely technical assistance from suppliers all over the world.

  Advantage 2: Variable-frequency air compressor can set pressure at will and maintain constant pressure

  1. The unit will always maintain a constant pressure of ±0.1bar under the set pressure;

  2. Satisfied users can set the pressure arbitrarily in the range of 3~14bar, without changing gears or belts;

   (Note: The highest pressure value should be determined when purchasing the machine);

  3. When the air consumption is small, the pressure remains the same and the speed is automatically reduced, so that only enough air is satisfied.

  4. When the air consumption is large, the pressure remains unchanged and the speed is automatically compensated to ensure the air supply needs;

   Advantage 3: High efficiency and power saving

  1. With variable speed control technology, the compressor displacement can be perfectly combined with the user's air consumption, completely avoiding the loss of unloading power;

  2. Under the condition of intermittent air consumption, through the zero-load effect of soft start, the current and torque peaks are avoided, so the unit can start and stop unlimited times. Really achieve 0-100% stepless speed change, and control the generation of useless work to the maximum extent;

  3. Eliminate the extra pressure burden of 2bar, allowing the air compressor unit to directly save energy by 14%, because every 1bar reduction in working pressure can save 7% of energy loss.

   Advantage 4: Energy saving

   Compared with traditional air compressors, air compressors equipped with frequency converters: air compressors equipped with frequency converters can automatically adjust the operation of the air compressor according to the air consumption, which can save energy and have significant effects.

   Advantage 5: Energy saving and emission reduction, scientific development

   Energy-saving in one year to recover the price difference compared with non-inverter units, and three-year energy-saving to recover the investment cost of the entire inverter unit!

   Advantage 6: More reliable

   1. The frequency conversion soft start avoids electrical shock and mechanical shock;

  2. Eliminate the unfavorable factors of long-term high-speed operation of the unit;

  3, no contactor, to avoid electrical contact failure;

  4. Eliminate the 2bar higher pressure, reducing the probability of system leakage.

   Advantage 7: Extend the service life of the air compressor

The frequency converter starts the air compressor from 0Hz, which can adjust the start time of the air compressor, thereby reducing the impact on some electrical or mechanical parts inside the air compressor when starting, enhancing the reliability of the system and ensuring the service life of the compressor extend.

   In addition, the frequency conversion control can reduce the current fluctuation when the unit starts, and this fluctuating current will affect the power consumption of the grid and other equipment. Sanjing inverter can effectively reduce the starting current peak value to the minimum.

   Advantage 8: The equipment is in place and start immediately

Any frequency conversion air compressor unit we recommend does not require special installation foundation. The low-speed axial fan and modern vibration isolation and noise reduction measures make the noise of the compressor very low during operation, so it is convenient for users to place it on the production site. As long as the equipment is in place and the pipeline is connected quickly, it can be started immediately.

   Advantage 9: The noise of the air compressor is reduced

   After the inverter is installed, the motor speed of the compressor is obviously slowed down under the required working conditions, which significantly reduces the noise generated by the air compressor. According to on-site inspections, the current noise is 3-7 decibels lower than the original noise.

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