Working Principle
The motor of a power frequency screw compressor operates at a fixed speed, converting three-phase alternating current into direct current, with control completed by a controller. Its output pressure and flow rate are both fixed, and the output of the compressor is typically controlled by adjusting the inlet guide vanes or an unloading device to limit the amount of compressed air.
| Motor power | Exhaust pressure | Exhaust volume | net weight | Dimensions |
| 7.5kw | 0.8MPa | 1.06(m3/min) | 145kg | 780/540/685mm |
Products Description
Advantages: The structure is simple, operating at a fixed frequency. The control system and circuit design are relatively simple, resulting in lower manufacturing costs and relatively affordable prices, making it suitable for small and medium-sized enterprises.
Disadvantages:Low energy efficiency: It cannot adjust the speed according to actual demand, which may result in energy waste during partial load operation, leading to relatively low energy efficiency.High noise: It produces a lot of noise during startup and operation, which may adversely affect the working environment.High maintenance costs: Due to limited load capacity, running for long periods under high load may cause premature degradation of the equipment, increasing maintenance and repair costs.Relatively short lifespan: It cannot intelligently adjust the operating power based on load conditions, which may result in a relatively short service life.
Main components
Screw compressor:
It is the core component of the air compressor, which compresses air through the intermeshing of male and female
screws. Motor:
Provides power to the screw compressor, usually using a three-phase asynchronous motor that operates at a fixed frequency speed.
Oil-gas separator:
Used to separate oil and air from the compressed air, ensuring that the oil content of the output compressed air meets the requirements.
Cooling system:
Includes parts such as cooling fans and coolers, which are used to reduce the heat generated during the operation of the air compressor to ensure normal operation of the equipment.
FAQ
Q:What is the main difference between power frequency screw machine and frequency conversion screw machine?
A: 1.Control mode: the power frequency machine runs through a fixed frequency (50Hz/60Hz), and the speed is constant; The frequency converter can adjust the frequency, and the speed changes dynamically with the load.
2.Energy saving: The power frequency machine has higher energy consumption at low load, and the inverter can be adjusted on demand, and the energy saving effect is better.
Q: What should I do if the power frequency screw machine is noisy when it is running?
A: 1.Check the installation of the equipment: confirm whether the unit is fixed smoothly and whether the anchor bolts are loose.
2.Troubleshoot component issues: Check whether fans, bearings, or rotors are worn out, and replace aging parts in a timely manner.
3.Increase sound insulation measures: Install sound insulation cotton or sound insulation cover in the computer room to reduce noise transmission.
Q: What are the common reasons for frequent downtime of power frequency screw machines?
A:1.Overload protection: If the system pressure is too high or the motor is overheated, the protection mechanism is triggered.
2.Insufficient lubrication: Insufficient amount of lubricating oil or deterioration of oil, resulting in excessive friction on components.
3.Circuit failure: Poor contactor contact, voltage instability, or sensor failure.
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