This is 10 hp 3 phase screw air compressor. As professional twin screw air compressor manufacturer, we provide reliable quality and good price. Double screw air compressor is more mature than single screw type. The air flow of this 7.5 kw compressor is about 40 cfm @7bar. And this 3 phase screw compressor is fixed speed drive type. Of course, if you want PM VSD type, we also produce it. Besides 380V 50HZ/60HZ, other voltages are also available, such as 220V, 240V, 415V, 440V and 460V 3 phase.

① Reliable quality

Our twin screw air compressor uses good spare parts. Firstly, the airend is most famous China brand ~ Hanbell. The bearings are also SKF brand. The airend has two years warranty time. Secondly, the three air compressor filters also have high quality. The lubricant oil is Shell brand. In addition, it uses the special low speed motor for air compressor. The efficiency is higher than similar products. Ensure trouble-free operation.

② Stable air pressure and air flow

Because of simple structure and quality parts, it has excellent stability. Double screw air compressor is not prone to failure. Air production is sufficient. The capacity of 10 hp 3 phase screw air compressor is 1.2m³/min.

③ 100% transmission efficiency

This 7.5 kw screw air compressor uses the direct connection structure. So there is no loss. Low maintenance costs. And easy to disassemble. Significantly reduces downtime.

④ Intelligent control system

If no air consumption for a long time, the twin screw air compressor will automatically stop. When the air is restored, it will start again. Besides, it can display various faults. Ensure the reliable operation of the air compressor to the greatest extent. Improve its service life.

⑤ OEM/ODM customization ability

Firstly, we can print your logo on the 10 hp 3 phase screw air compressor. Secondly, if you need special voltages, there are available. In addition, if you want to use other brand parts, we can also customize it.

(1) Whole machine comparison:

① Air compressor power is different

Assume the air flow is the same ~ 3m³/min. The single screw compressor power is 5.6~6.2KW. But the power of double screw air compressor is a bit bigger: 6.0~6.6KW.

② Noise and vibration

Single screw: no vibration (steel coins can stand upright and not fall down). The noise is: 60-68dB. Twin screw compressor: the vibration is greater because the forces cannot be balanced. The noise is: 68-88dB. For example, the noise of 10 hp 3 phase screw air compressor is 68dB.

③ Bearing durability

Single screw compressor: radial and axial balance. Long bearing life. Rotor bearing 30,000 hours. Star wheel bearing 50,000 hours.

Twin screw type compressor: no balance at all. The load of the second rotor is extremely large. The bearing life is short, generally: 8000-18000 hours. It needs professional personnel to replace the bearings.

④ Temperature: The exhaust temperature of the single screw compressor is <90°C. Twin-screw temperature <110°C.

(2) Usage cost comparison:

① Electricity fee (calculate at 3m³/min)

Single screw: 35.62508=33600KW/h. Twin-screw air compressor: 36.52508=39000KW/h.

② Normal maintenance fee

Assume both run for 30 years. The twin-screw machine needs to change the screw 5 times. The cost is equivalent to 1.5 times that of buying a new airend.

The single screw only needs to change the star wheel 3 times. Besides, the price of the star wheel is quite low. The cost of this piece of single-screw is only about 10% of that of twin-screw. If it’s fixed speed drive 10 hp 3 phase screw air compressor, there are 4pcs or 6pcs bearings. AC airend has 4pcs bearings. And AB airend has 6pcs bearings.

③ Oil consumption

Single screw has low operating temperature. So the oil itself is not demanding. Therefore the cost is low.

Twin screw air compressor runs at high temperature. Therefore, the requirements for oil are high. Additionally, high temperatures carbonize the oil. Need to replace oil many times. So the cost is high.

④ Bearing life (equal SKF bearing)

The bearing of the single screw compressor is replaced every 30,000 to 50,000 hours.

The twin-screw compressor is changed every 8000-18000 hours.

(3) Different working principles:

The former: single-screw rotor drives two symmetrically distributed star wheels to rotate. Screw groove and the inner wall of the casing form a closed chamber. Bring the air to the required pressure.

The latter: the airend consists of intermeshing rotors. When working, one rotor rotates clockwise. The other turns counterclockwise. So it generates the compressed air during intermeshing.

(4) Force balance

Single-screw air compressor: The force balance is excellent. Screw bears radial and axial air forces. They can be automatically balanced. The star gear teeth bears the forces. So it requires that the star gear teeth have sufficient strength and rigidity.

Twin screw type air compressor: the screw rotor bears large radial and axial air forces. The air forces are unbalanced. However, it can improve axial force balance through structural design. There are no unbalanced inertial forces.

(5) Manufacturing cost

Former: it can use ordinary bearings for screw and star wheel. Manufacturing costs are lower.

Latter: the load on the two-screw rotor is relatively large. Therefore, it requires to use high-precision bearings. Manufacturing costs are higher. For this 10 hp 3 phase screw air compressor, we can supply good price. Different spare parts, different prices.

(6) Applicability of single screw and twin screw air compressor are different

The former: it’s suitable for occasions with high exhaust pressure. It can also be made into a water-lubricated air compressor.

The latter: There are limitations in terms of rotor stiffness and bearing load. Therefore, it can only be suitable for the medium and low pressure range. The exhaust pressure generally doesn’t exceed 1.6Mpa.

A pair of rotors rotate in the airend casing. Thereby change the working volume. As a result, the air volume shrinks and its density increases. Finally increase the air pressure.

Its working process is divided into: inhale air, compression and exhaust. The rotors whirl. Then the teeth that mesh with each other complete the same work cycle successively.

Inhalation: At first, the air enters the rotors cavity volume. As the rotor turns, this volume continues to expand. When reaching the maximum value, the cavity volume and the suction hole port are disconnected. Then the inhalation process ends.

Compression stage of twin screw 10 hp 3 phase air compressor: The volume of the rotors cavity gradually decreases. This achieves the compression of the air. At the same time, lubricating oil is also sprayed into the compression chamber. These oils are mixed with air. When it is connected to the exhaust port again, the compression process ends.

Exhaust process: The volume of the rotor cavity is continuously reduced. The air and oil are gradually discharged through the exhaust orifice. This process continues until the profiles at the ends of the teeth are fully engaged. Both ends of the twin rotors are supported by high-speed bearings.

(1) The air compressor runs at high temperature

When the operation temperature of 10 hp 3 phase air compressor exceeds 95°C, we can solve it in three steps:

① Firstly confirm whether the room temperature is within the allowable range. Then check to see if the compressor oil level is normal.

② Secondly, check whether the temperature measuring element is faulty. We can calibrate it with a hand-held temperature measuring instrument.

③ If there is no problem with the temperature measuring element, check the temperature difference between the inlet and outlet of the oil cooler. See if it is within the normal range of 5-8°C.

If the temperature difference is greater than this range, it means that the oil flow is insufficient. Or the oil line is blocked. It is also possible that the temperature control valve doesn’t open fully.

Please check the oil filter and thermostat valve. We can take the valve disc. Close one end of the thermostatic valve. Force the oil all through the cooler. If still not solve the problem, consider whether the oil circuit has blockage.

If it is less than the normal range, it means poor heat dissipation. Check if the radiator is too dirty. Or whether the cooling fan is abnormal.

If it is within the normal range, the 10 hp 3 phase twin screw air compressor is still high temperature. It means that the airend heat is beyond the normal range. Check for overpressure operation. Or verify that the oil is in good condition. It is also possible that there is a problem with the bearings.

(2) Air compressor does not unload

The unloading pressure set by the twin screw air compressor is 0.77MPa. The loading pressure is 0.66 MPa. That is, when the pipeline pressure reaches 0.77 MPa, the airend should unload. Sometimes it has reached 0.8MPa without unloading. So the pressure of oil and air in the separator will be too high. Then it will cause the air compressor safety valve to operate continuously. Because the set value of safety valve action is 0.86MPa. As a result, the oil and air mixture will spray out of 10 hp 3 phase screw air compressor.

Possible reasons are as follows:
① Is an unloading command on the computer;
② Does the solenoid valve in the control loop operates;
③ Whether the action of the diaphragm converter of the intake valve is flexible;
④ Whether the inlet air temperature meets the requirements of double screw air compressor.

Treatment measures:

① Improve the inlet temperature of 10 hp 3 phase screw air compressor.

② Reset the unload value. Change it from the original 0.77MPa to 0.69MPa. The loading value is 0.61MPa. After reducing the pressure, the number of converter actions will increase. In this way, twin screw air compressor will operate normally.

Q1: What’s the air capacity of your 10 hp 3 phase screw air compressor?

A1: When pressure is 7 bar, the air flow is 42 cfm.

Q2: How about the oil content of your twin screw air compressor?

A2: It is less than 3ppm. If you have high requirement for air quality, it can add the refrigerated dryer and adsorption air dryer.

Q3: What’s the warranty policy for the twin screw type compressor?

A3: The machine has one year warranty time. And for airend, it’s two years. Besides, we provide the technical service all the time.

Q4: What’s the price of your 10 hp 3 phase screw air compressor?

A4: Firstly, this one is the fixed speed drive air compressor. Its price is cheaper than PM VSD type. Secondly, different spare parts, different prices for choice. The AC airend with 4 pcs SKF bearings is cheaper than AB airend with 6 pcs SKF bearings. Moreover, our motor has two kinds: IP54 and IP23. So pls kindly tell us your specific requirements: fixed speed or variable speed, AC airend or AB airend, IP54 or IP23 class motor? Thanks!

Q5: How long is your production time?

A5: If normal 380V 50HZ 10 hp 3 phase twin screw air compressor, it only takes 15~20 days. But if you have customization demand for voltage or color, the time will be a bit longer. It will take about 30~40 days.