5.5 kw air compressor is our small screw compressor. And this is belt driven rotary screw air compressor. Belt drive screw compressor is different from other direct drive compressors. It is more suitable for air compressors with low power. The air flow of this 7.5 hp screw compressor is 28 cfm @7bar. So if you want 25 cfm rotary screw air compressor, you can choose this one. And its available pressure is 7 bar, 8bar, 10 bar and 12.5bar. Our 5.5kw screw air compressor is quiet and has low noise. Moreover, we can customize the special voltages. The regular voltage of this 7.5 hp screw air compressor is 380V 50HZ 3-phase. But we also provide 220V, 440V, 460V 60HZ.
Specifications & parameters of our 5.5 kw air compressor
| No. | Parameter Name | Unit | Data of 7.5 HP Screw Compressor |
| 1 | Nominal Flow/Rated Exhaust Pressure of Belt Driven Screw Compressor | （m3/min）/ Bar | 0.8Nm³/min @7bar; |
| 0.7Nm³/min @8bar; | |||
| 0.6Nm³/min @10bar; | |||
| 2 | Application Temperature | ℃ | -5～+45 |
| 3 | Rotary Air Compressor Cooling Method | Air-cooled type | |
| 4 | Outlet Exhaust Temp. | ℃ | ≤ambient temp. + 15 |
| 5 | Lubricating Oil Q’ty | L/kg | 4L |
| 6 | Compressor Drive Type | Belt drive | |
| 7 | Air Volume Adjustment Method | ON/OFF | |
| 8 | Oil Content in Outlet Compressed Air | ppm | ≤3 |
| 9 | Belt Drive Rotary Screw Air Compressor Noise | dB(A) | 68±2 |
| 10 | Compressor Lubricant Oil Brand | Kaipu brand oil | |
| 11 | Motor Power of This Belt Driven Screw Compressor | kW | 5.5 |
| Rotary Air Compressor Motor Speed | rpm | 2980 | |
| Industrial Compressor Start Type | Y-△ Start | ||
| Available Compressor Voltage / Frequency | V/Hz | 380/50 | |
| Air Compressor Motor Protection /insulation class | IP54/F Class | ||
| 12 | External Dimensions of 5.5 KW Air Compressor | mm | 760x600x800 |
| 13 | Machine Net Weight | kg | 150 |
| 14 | Outlet Port Diameter | in | Rp3/4 |
Why choose our 5.5 kw belt driven rotary screw air compressor
(1) Adopt high quality drive belt
This 7.5 hp screw compressor uses heavy-duty belt. It has a long life and high reliability. Besides, it can maintain constant belt tension in every phase of operation. So it has consistently good drive efficiency. In addition, there is a convenient tensioning device. Therefore, this makes maintenance work easy.
(2) High performance compressor airend
Our 5.5 kw air compressor is with Baosi airend. Baosi is one of the best airend manufacturers in China. Its rotors are of large diameter structure. And it uses the advanced 5:6 tooth profile. So it ensures effective compression efficiency and sufficient air volume. Furthermore, the bearings are durable SKF heavy-duty bearings. They have a service life of up to 100,000 hours.
(3) Reliable and intelligent control
This belt driven screw compressor comes with intelligent microcomputer control technology. So you can fully monitor and manage the entire air compressor under command. Unattended operation is possible. Besides, there is a user-friendly human-machine interface. It can display commands and parameters. And it has a self-diagnostic fault and alarm function.
(4) This 5.5 kw air compressor is with reasonable system structure design
In order to achieve better heat dissipation, our designers use larger heat exchanger with large area. This is why our air compressors have good heat dissipation efficiency and lower noise levels.
Belt drive rotary screw air compressor vs direct drive
Belt driven screw compressor can use pulleys of different diameters to change the speed of the rotor. The direct drive screw air compressor is different. It refers to the way that the motor shaft drives the rotor through the transmission of the coupling and the gear box. These two methods are good transmission types. But what is the difference between the two?
(1) Belt driven screw compressor
The connection drive between the air compressor motor and the airend is connected by a belt. For example, our 5.5 kw air compressor uses this kind of transmission. The advantages of the belt drive mode are as follows: the structure is relatively simple. Moreover, the economy and practicability are good. It is also easier to replace later if necessary. Besides, we can quickly change the pressure according to the requirements of users. The disadvantages of belt drive are below: the belt is easy to wear after a long time of use. This can cause slippage. The transmission efficiency is slightly lower than other transmissions.
(2) Direct drive rotary screw air compressor
The screw compressor motor is connected with the airend through a coupling. For example, our big industrial air compressors generally use the direct drive type. The motor and the airend run at the same speed. Therefore, the service life is longer. Besides, its direct transmission efficiency is higher. In addition, it does not require complicated maintenance work. Only need to replace the rubber spring pads of the coupling. Due to the high transmission efficiency, direct drive becomes more and more popular in the market.
FAQ
Q1: Is your 5.5 kw air compressor belt drive or direct drive?
A1: Our 7.5 hp 5.5 kw screw air compressor is belt driven.
Q2: What’s the voltage of your 7.5 hp screw compressor?
A2: The regular voltage of our industrial rotary air compressor is 380V 50HZ 3-phase. Of course, if you need other voltages, such as 220V, 460V, 440V 60HZ, we also manufacture it.
Q3: How to replace the belt of rotary screw air compressor?
A3: Belt driven screw compressor has many advantages. But we need to replace transmission belt. Firstly, stop the belt drive rotary screw air compressor. Secondly, loosen the mounting bolts on the airend. Afterwards, rotate the adjusting screw. Adjust the belt to the correct tightness. Finally tighten the airend fixing bolts. Need to pay attention: Do not splash lubricating oil on the belt or pulley to prevent the belt from slipping.
Q4: Can I also buy some spare belts with this 5.5 kw air compressor?
A4: Sure. We usually advise customers to purchase some belts for replacement in the future.
