Control system composition and working principle 1.1 system consists of the system by the power switch cabinet. The frequency converter, intelligent port regulator, wind pressure sensor and on-site air compressor unit form a complete closed-loop regulation system. The power switch cabinet is installed in the system, the purpose is to keep the original step-down start control cabinet as a backup to ensure the reliability of the air compressor operation. The system composition is shown in Figure 1.
1.2 Working principle The air compressor is used to increase the air pressure and deliver the gas. The machine is a king machine that converts the motive power of the prime mover into gas pressure energy. The AC motor drives the gas compressor to reciprocate through the belt, compresses the air into compressed air in the cylinder, and then delivers it to the user through the pipeline.
When the air volume is constant, the pressure of the compressor output is positive with the moving frequency of the cylinder. The larger the moving frequency of the cylinder is, the larger the output pressure is. The smaller the moving frequency of the cylinder is, the smaller the output pressure is. The cylinder's motion frequency is proportional to the motor's speed.
2 Operational effect analysis After installing one Japanese Fushun inverter on the air compressor with rated air output of Yongan Vehicle Section 2011 motor rated power of 1321, the energy saving effect is obvious, the operation reliability is used, and the use is more than 4 years. There has been a malfunction.
The relative energy saving of the variable frequency air compressor is closely related to the gas supply quantity, and the gas supply quantity is constantly changing under different pressures. Therefore, it is difficult to directly calculate the electric energy saved by using the frequency conversion ratio instead of using the frequency conversion. Generally, accurate data is obtained by comparing the operating parameters before and after the energy saving reform. We tested the data before and after the system transformation of the front end of the switch cabinet.
The service life of the air compressor has increased. The air compressor realizes the soft start function and eliminates the instantaneous mechanical shock of the start. At the same time, in the frequency conversion state, the air valve of the air compressor becomes the backup operation and protection, the number of actions is greatly reduced, and the failure rate is reduced to prolong the service life.
The gas supply pressure is stable. In the frequency conversion state, the pipe network pressure can be stabilized at around 0.693, ensuring stable use of gas equipment and improving work quality. Improved protection performance. The frequency conversion equipment has good power cut protection. The power supply undervoltage, overvoltage protection and current overcurrent protection, therefore, the protection function of the control system is improved.
The working environment has been improved. The application of the variable frequency speed control technology air compressor is stable and noiseless, which greatly improves the working environment. 3 Notes and maintenance 3.1 The inverter is the most important component of the variable frequency speed control system. Pay attention to the following matters when installing.
Power grid. It cannot be used on the line where the power supply is used for the railway network. The instantaneous fluctuation of the railway network voltage is large and the harmonics are high, which will cause the inverter to malfunction. This phenomenon is confirmed when it is used on the shovel air compressor station.
Ambient temperature. When the temperature is too high and the temperature changes greatly, the inside of the inverter is prone to condensation and its insulation performance will be greatly reduced or even cause a short circuit accident.
Vibration and shock. When the control cabinet equipped with the inverter is subjected to mechanical vibration and shock, it may cause poor electrical contact. Therefore, in addition to improving the mechanical strength of the control cabinet, away from the vibration source and the impact source, the anti-vibration rubber pad should also be used to fix the control cabinet.
Corrosive gas. If the concentration of corrosive gas used in the environment is large or the air is too humid, it will not only corrode the leads of the components. Printed circuit boards, etc., and will accelerate the aging of plastic devices to reduce insulation performance.
In order to extend the service life of the inverter and protect the normal operation of the system, it is very important and effective to carry out regular inspection and maintenance of the inverter. In addition to cleaning and maintenance of the equipment, the main contents to be checked are: smoothing of the main circuit. Capacitor, logic control loop, power loop. Inverter drives the electrolytic capacitor of the protection circuit and the fan in the cooling system.
1.2 Working principle The air compressor is used to increase the air pressure and deliver the gas. The machine is a king machine that converts the motive power of the prime mover into gas pressure energy. The AC motor drives the gas compressor to reciprocate through the belt, compresses the air into compressed air in the cylinder, and then delivers it to the user through the pipeline.
When the air volume is constant, the pressure of the compressor output is positive with the moving frequency of the cylinder. The larger the moving frequency of the cylinder is, the larger the output pressure is. The smaller the moving frequency of the cylinder is, the smaller the output pressure is. The cylinder's motion frequency is proportional to the motor's speed.
2 Operational effect analysis After installing one Japanese Fushun inverter on the air compressor with rated air output of Yongan Vehicle Section 2011 motor rated power of 1321, the energy saving effect is obvious, the operation reliability is used, and the use is more than 4 years. There has been a malfunction.
The relative energy saving of the variable frequency air compressor is closely related to the gas supply quantity, and the gas supply quantity is constantly changing under different pressures. Therefore, it is difficult to directly calculate the electric energy saved by using the frequency conversion ratio instead of using the frequency conversion. Generally, accurate data is obtained by comparing the operating parameters before and after the energy saving reform. We tested the data before and after the system transformation of the front end of the switch cabinet.
The service life of the air compressor has increased. The air compressor realizes the soft start function and eliminates the instantaneous mechanical shock of the start. At the same time, in the frequency conversion state, the air valve of the air compressor becomes the backup operation and protection, the number of actions is greatly reduced, and the failure rate is reduced to prolong the service life.
The gas supply pressure is stable. In the frequency conversion state, the pipe network pressure can be stabilized at around 0.693, ensuring stable use of gas equipment and improving work quality. Improved protection performance. The frequency conversion equipment has good power cut protection. The power supply undervoltage, overvoltage protection and current overcurrent protection, therefore, the protection function of the control system is improved.
The working environment has been improved. The application of the variable frequency speed control technology air compressor is stable and noiseless, which greatly improves the working environment. 3 Notes and maintenance 3.1 The inverter is the most important component of the variable frequency speed control system. Pay attention to the following matters when installing.
Power grid. It cannot be used on the line where the power supply is used for the railway network. The instantaneous fluctuation of the railway network voltage is large and the harmonics are high, which will cause the inverter to malfunction. This phenomenon is confirmed when it is used on the shovel air compressor station.
Ambient temperature. When the temperature is too high and the temperature changes greatly, the inside of the inverter is prone to condensation and its insulation performance will be greatly reduced or even cause a short circuit accident.
Vibration and shock. When the control cabinet equipped with the inverter is subjected to mechanical vibration and shock, it may cause poor electrical contact. Therefore, in addition to improving the mechanical strength of the control cabinet, away from the vibration source and the impact source, the anti-vibration rubber pad should also be used to fix the control cabinet.
Corrosive gas. If the concentration of corrosive gas used in the environment is large or the air is too humid, it will not only corrode the leads of the components. Printed circuit boards, etc., and will accelerate the aging of plastic devices to reduce insulation performance.
In order to extend the service life of the inverter and protect the normal operation of the system, it is very important and effective to carry out regular inspection and maintenance of the inverter. In addition to cleaning and maintenance of the equipment, the main contents to be checked are: smoothing of the main circuit. Capacitor, logic control loop, power loop. Inverter drives the electrolytic capacitor of the protection circuit and the fan in the cooling system.
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