Screw style air compressor is different from piston air compressor. It has stable exhaust pressure. Moreover, the noise is lower. We are screw type air compressor manufacturer. And produce high quality electric rotary screw air compressor. This product is 40 hp industrial air compressor. Its air flow is about 180 cfm @7bar. The regular voltage of our 30kw screw air compressor is 380V 50HZ 3-phase. Of course, we can also customize the special voltages, such as 220V, 240V, 415V, 440V and 460V 60HZ.

① Firstly, electric rotary screw air compressor adopts high-quality airend. The airend is the best Hanbell brand in China. It has excellent rotor linearity. Moreover, the airend has little vibration and low noise. And it uses top quality and durable SKF bearings. So make the operation more stable.

② Secondly, low-speed motors use high-strength Ru-Fe-B magnets. When the motor starts, the torque is large. The air compressor motor has good insulation performance. Low noise and low vibration. Besides, it’s with phase sequence protection. So can prevent the motor from reversing.

③ Thirdly, our screw style air compressor adopts quality oil-air separator. It is resistant to high pressure and high temperature. Air filters can filter out tiny solid particles in the air. So as to ensure the normal operation and service life of the equipment.

④ The air compressor is with an advanced air volume regulating intake valve. It accepts microcomputer control system instructions. Thus, achieve execute precise adjustment of exhaust volume.

⑤ The screw type air compressor has a humanized LCD display interface. Therefore, the operation is convenient. It can automatically monitor the operating conditions and parameters of the air compressor. 24 hours automatic work under unattended.

⑥ Finally, the cooler adopts advanced guide design. Make the cold and heat exchange more complete. The outlet compressed air temperature is only 15°C higher than the ambient temperature. Meet various working conditions of users.

Electric rotary screw air compressor belongs to positive displacement compressors. It achieves the air compression by gradually reducing the working volume.

Its working volume composes of a pair of intermeshing rotor cogs and a casing. When the machine is running, the teeth of the two rotors are inserted into each other’s tooth slots. As the rotor rotates, this volume progressively decreases. The pressure gradually increases. This process is until reaching the required pressure. At this time, the alveolar side communicates with the exhaust port. So it achieve the air exhaust.

With the operation of screw style air compressor, the suction volume continues to expand. At the same time, the volume of the compressed air is continuously reduced. Thereby, it realizes the suction compression process in each tooth slot. The compressed air pressure reaches the required exhaust pressure in the tooth groove. At this moment, the alveolar just in time communicates with the exhaust port. The venting process begins.

The change of suction volume and compression volume is repeated. In this way, the compressor can continuously inhale, compress and exhaust.

① The composition of the two air compressors is different
Screw style air compressor composes of several parts. That is, screw airend, motor, air and oil filter, oil-air separator, refrigeration system, and automatic control system, etc. Piston air compressor generally contains an air storage tank. It does not contain the airend, oil filter and oil-air separator.

② Different performance
Electric rotary screw air compressor has many advantages. Firstly, the vibration is small. Mover, it has low noise and high efficiency. The exhaust pressure is stable. It is generally fixed. But the piston air compressor is different. The rated power of the motor is usually high. The working pressure of the exhaust pipe is not stable. Exhaust temperature is high. Besides, its noise is too loud. In addition, piston air compressors are generally movable.

③ Common problems are different
There are fewer common problems with screw style air compressor. Just do the maintenance on time. For example, replace the filter element, oil filter and oil-air separator, etc. Or replace the lubricating oil. But the failure rate of piston air compressor is relatively high. For example, cylinders, pistons, and piston rings are prone to wear and tear.

① The airend vibration is large
Common reasons are as follows: Accessory collision. Or the bearing gear processing is not good, etc. We can check the source of vibration and noise. Troubleshoot noise issues based on the source of the sound.

② Airend high temperature
Generally, it is because the oil supply of the screw style air compressor airend is insufficient. This makes the cooling system a problem. You can check whether the oil intake is sufficient. At the same time, check whether the inlet oil temperature is higher than the ambient temperature. Make sure the cooling system is functioning properly.

③ Insufficient air supply
Air filter clogged: clean or replace air filter. If the environment is harsh, please install a pre-filter.
Excessive leaks in work lines: check work lines for leaks with soapy water.
The intake valve is not fully opened: check whether the solenoid valve and relief valve are working normally.

④ Over temperature fault of electric rotary screw air compressor
Under normal circumstances, the exhaust temperature of the screw airend should be between 75 and 95°C. If the exhaust temperature is too high, it will cause damage to many components. In severe cases, the airend will be burned. Screw style air compressor is usually with ultra-high temperature protection function. Once the exhaust temperature exceeds 100°C, an alarm will be issued and the machine will automatically shut down.

The system is short of oil: During the operation, the oil level cannot be lower than the low oil level mark. If find that the oil is insufficient, it should stop immediately to refuel.

Insufficient oil supply: first check whether the oil filter and oil-air separator are blocked. If there is blockage, replace them in time.

Malfunctioning thermostatic valve: If the thermostatic valve malfunctions, the lubricating oil may not pass through the cooler. And the oil will enter directly into the nose. Therefore, the oil temperature cannot be lowered, so cause overheating. Then need to repair or replace it.

Q1: Is this electric rotary screw air compressor fixed speed or variable speed?

A1: This 40 hp industrial air compressor is fixed speed.

Q2: How about the warranty time of your screw style air compressor?

A2: Our screw air compressor machine warranty is one year. And the screw airend warranty time is two years.