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Advantages of screw air compressor
1 Screw air compressor has the advantages of high stability, high efficiency, low vibration, low noise and other advantages.
2 The combination of the yin and yang rotor and the rotor and the casing is set so that the gas leaks back and there is no clearance volume at the same time, so the efficiency is high.
3 Injected lubricant has a seal, cooling and lubrication
4 Small parts, no suction, exhaust valve.
1, host: European and American brands, excellent performance, reliable operation.
2. Motor: The efficiency of class F air-cooled motors exceeds the EFFL standard.
3, the drive system: the motor drive end application of compressor oil lubrication, high efficiency, maintenance-free, high reliability.
4, fan: cooling air volume, low noise.
5, cooling system: The use of plate-fin structure, and high-quality materials to ensure that the cooler pressure, high heat dissipation, corrosion resistance is good.
6, air filter: heavy-duty, multi-stage air inlet filter, dust removal accuracy of 1um (98% was filtered), large contact surface, long service life.
7. Oil/gas separator: The new generation of separators uses a brand new filter material that is more efficient and has an air content of less than 2 ppm.
8. Intelligent controller: All operations and relevant data of the air compressor operation are displayed on the control panel, and the control is made between your fingers, which is easy, convenient and accurate.
The principle of compression
(1) Inhalation process: The motor drives the rotor. When the space between the tooth groove of the master and slave rotors turns to the inlet end wall opening, the space is large. The outside air is full of them. When the inlet side of the rotor turns away from the shell When the air inlet is in the air, the air between the tooth grooves is enclosed between the main and the rotor and the casing, and the air suction process is completed.
(2) Compression process: At the end of inhalation, the closed volumes formed by the primary and secondary rotor tooth peaks and the casing decrease with the change of the rotor angle and move in a spiral shape, which is a “compression process”.
(3) Compressed gas and injection process:
In the conveying process, the volume is continuously reduced, the gas is continuously compressed, the pressure is increased, the temperature is increased, and at the same time, the lubrication that becomes misty due to the air pressure is injected into the compression chamber, thereby achieving the effect of compression, reduction of temperature sealing and lubrication .
(4) Exhaust process:
When the closed tooth peak of the rotor rotates to meet with the exhaust port of the casing, the compressed air starts to discharge until the matching surface of the tooth peak and the tooth groove moves to the exhaust end face, and the tooth groove space is zero at this time, ie the row is completed. Gas process. At the same time, the other pair of tooth grooves of the primary and secondary rotors has been rotated to the intake side, forming the maximum space, and the suction process is started, thereby starting a new compression cycle.
Working pressure
The pressure unit is represented in many ways. Here, the pressure unit commonly used in screw air compressors is introduced.
1 Work pressure, domestic users often refer to the exhaust pressure. Working pressure refers to the highest pressure of the air compressor exhaust;
2 Common working pressure units are: bar or Mpa, 1 bar = 0.1 Mpa;
3 In general, the user usually refers to the unit of pressure as: Kg (kg), 1 bar = 1 Kg.
Volume capacity
1 volume flow, domestic users often say the amount of exhaust. Volumetric flow refers to the volume of gas discharged per unit time of the air compressor under the required exhaust pressure and converted to the state of intake air.
2 Volume flow units are: m3/min (cubic/min) or L/min (liter/min), 1m3 (cubic) = 1000L (litre);
3 In general, the commonly used flow units are: m3/min (cubic/minute);
4 Volumetric flow in our country is also known as displacement or nameplate flow.
Air compressor power
1 In general, the power of the air compressor refers to the nameplate power of the matched drive motor or diesel engine;
2 The unit of power is: KW (kW) or HP (hp/hp), 1KW ≈ 1.333HP.
Screw compressor use and maintenance
General safety precautions
1. The operation, maintenance and maintenance of the compressor must be performed by qualified personnel.
2. The compressor cannot be reversed. After the initial start-up or maintenance of the electronic control system, it must first confirm whether the motor rotation direction is consistent with the specified direction of rotation before starting the compressor.
3. When disassembling a high temperature component, it must be done before the temperature cools to ambient temperature.
4. It is recommended to use screw compressor oil. Different grades of lubricants are not allowed to be mixed.
5. Without permission from the manufacturer, do not make any changes to the compressor that affect the safety or reliability or add any devices.
6. The compressor original spare parts are specially designed and manufactured. It is recommended to use authentic spare parts to ensure the reliability and safety of the compressor.
7. It is absolutely not allowed to block the suction port of the compressor during operation.
8. It is absolutely forbidden to use compressed air for breathing unless it has been indicated that it can be used for breathing.
9. The compressor must not be operated beyond the specified pressure and temperature.
10. Once you find that the compressor is working abnormally, stop the compressor immediately and remove the abnormality in time.
11. Use the correct tools to maintain and repair the compressor.
12. After maintenance, confirm that all safety devices have been reinstalled and the tools have been removed from the compressor.
maintenance
1. Daily check the oil level, exhaust temperature and exhaust pressure, check for abnormal sound;
2. Open the separator drain valve every week before starting to discharge condensate, check for leaks everywhere, check the safety valve, and inspect the belt for wear (visual inspection);
3. Regularly check the air intake control valve, minimum pressure valve, electric control box connection terminal, safety valve, cooling fan;
4. Regularly clean and clean the cooler to test the reliability of the safety valve;
5. Regularly change the oil filter core, oil separator filter element, intake filter element and lubricant.
Common troubleshooting
1 machine does not start: check the main switch and power cord, check the motor;
2. After the machine is turned on, the machine is not loaded: adjust the pressure switch setting value or replace the pressure switch, check or replace the solenoid valve;
3. Compressor does not unload, safety valve discharge: adjust the pressure switch setting value or replace the pressure switch, check or replace the solenoid valve;
4. Too much fuel consumption: According to the recommended oil, reduce the oil level to the normal position, remove the oil return pipeline cleaning, replace the oil separator filter;
5. The discharge pressure is lower than the specified value: reduce the amount of gas used or increase the compressor, check the system leakage, clean or replace the intake filter core, replace the oil separator filter, check or replace the solenoid valve, repair the intake control valve, replace Belt, adjust the pressure switch setting value;
6. Compressor high temperature protection shutdown: improve the ventilation condition of the environment, clean or clean the cooler, add oil to the specified position, and replace the oil filter;
7. Compressor unloading operation, the discharge pressure is still slowly rising, safety valve discharge: check or replace the solenoid valve, repair the inlet control valve, overhaul unloading pipeline;
8. Relief of safety valve: Check or replace safety valve, check minimum pressure valve, replace oil separator element, repair or replace pressure switch, check intake control valve or solenoid valve.
Screw Air Compressor Fault Analysis
Screw air compressor is a common type of air compressor. The failure of screw air compressor will affect its service life and the personal safety of operators. Therefore, it is very important to understand the failure of screw air compressor in industrial production.
1. Screw air compressor failure phenomenon: large fuel consumption or high oil content of compressed air
The reason for this failure is due to too much coolant, the correct location should be observed when the unit is loaded, at this time the oil level should not be more than half; plugging of the return pipe can also cause screw air compressor failure;
Failure to install the return pipe will result in excessive fuel consumption in the screw-type air compressor. Exhaust pressure will be too low when the unit is running. Breakage of the oil separation core will lead to malfunction of the screw air compressor. Damage to the internal partition of the separation cylinder. Agent deterioration or extended use.
2. Screw air compressor failure phenomenon: unit pressure is low
The reason for this failure is that the actual gas consumption is greater than the output gas volume of the unit; screw air compressor deflation, intake valve failure (can not be closed when loaded); transmission system is not normal, the ambient temperature is too high, the air filter is blocked; load Solenoid valve (1SV) failure; minimum pressure valve stuck; user pipe network leak; pressure sensor, pressure gauge, pressure switch and other screw air compressor failure will lead to unit pressure is low; pressure sensor or pressure gauge input hose leak ;
3 screw air compressor failure phenomenon: fan motor overload
Fan deformation; fan motor failure; fan motor thermal relay failure (ageing); loose wiring; cooler plug; exhaust resistance.
4. Screw air compressor failure phenomenon: large unit current
The voltage is too low; the wiring is loose; the unit pressure exceeds the rated pressure; the oil separation core is blocked; the contactor is faulty; the main engine is faulty; the main motor is faulty;
Screw air compressor purchase knowledge
Exhaust pressure
The higher the compressor's exhaust pressure, the more energy it consumes. The sum of the pressure, line resistance loss, and pressure drop of the associated equipment will be determined as the lower limit of the rated discharge pressure of the optional screw air compressor. Under normal circumstances, the diameter of the gas transmission line should be selected larger. In order to reduce the loss of resistance, the purpose of reducing long-term operation to reduce energy consumption. The higher the compressor's exhaust pressure, the more energy it consumes. So don't use compressors with too high discharge pressure
2. Displacement
Calculate the actual total amount of gas ╳1.1-1.2 coefficient, as the type of exhaust gas selection, if the selection is too low, it can not reach the specified value of the gas equipment, if the selection is too large, it will result in large energy consumption of minus charge, minus The uneconomical nature of the charge. At the same time purchase a large displacement screw air compressor purchase costs are higher.
3. Compressed air quality
According to the requirements of the gas equipment in the industry for compressor gas, screw air compressors and supporting equipment should be selected. The following points need to be considered:
1) Reduce the oil content in the compressed gas. Degreasing purifier can be used. If the treatment index is high, multi-level treatment can be used.
2) Reduce the water content in compressed gas.
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