China OEM 7.5kw-250kw Industrial Weg Motor Rotary Direct Drive Screw Water Lubricated Oil Free Screw Air Compressor for Oxygen Plant / Food Industry/ Medical Industry arb air compressor

Product Description


Product Description

Our Advantages


ZIQI Oil Free Water Lubricant Screw Air Compressor Advantages:


1. 100% oil-free , good reliability
There is no oil in the water-lubricated screw body, which will not cause oil pollution of the compressed air. It belongs to a
completely oil-free screw air compressor. Dry-type oil-free machine bearings, gearboxes, and intercoolers require oil to
participate in lubrication and sealing. The high temperature of the unit can easily cause oil leakage to pollute the compressed air. It is a semi-oil-free compressor.

2. Isothermal compression, high efficiency, no flammable, explosive, etc.
The operating temperature of the oil-free screw machine does not exceed 50ºC, and the gas does not expand to save energy by more than 15%. The exhaust temperature of the semi-oil-free screw machine is above 180ºC. The high temperature makes the bearing, screw, body, and sealing material have a very short service life and must be expensive. s material. The volatilization of lubricating oil at high temperatures can cause fires and explosions.

3. Power saving: water-lubricated compressor is 1 of the lower energy consumption of oil-free machines in the world.
ZIQI air dry oil-free air compressor 90KW, nameplate capacity 12.50m?/min (10bar), water-jet all oil-free air compressor 90KW, the actual measured air volume is 14.52m?/min (10bar), the displacement has increased by 16%, This means that users save 16% of electricity. According to the calculation based on running 24 hours a day and the electricity cost of 1.0 yuan/kWh, each unit can save 1.26 million yuan in electricity costs for 10 years.

4. The compression temperature is relatively low, the host has a long life, the maintenance cost is relatively low, and the
trouble-free operation cycle is long.The main engine of the water-jet all-oil-free compressor has a general warranty of 5 years and a design life of more than 25 years. Low maintenance costs are a reliable choice for formal enterprises to focus on energy management and reduce product costs.

5. Simple maintenance and no worries

It is as simple as a “water pump” to ensure no worries.

The water content in compressed air is low. All compressors produce 100% saturated water vapor. The pressure dew point of water-injected and oil-free compressed air is less than 40 degrees Celsius. Actually, it contains less water, and a lot of water in the air will be discharged. .


Motor Air pressure Air Flowing Motor power Dimension Weight
mpa bar psi m3/min cfm hp kw L(mm)*W(mm)*H(mm) kgs
OF-11A 0.7 7 102 1.6 56 15 11 1100mm*800mm*1000mm 500
0.8 8 116 1.5 53
1 10 145 1.3 46
OF-15A 0.8 8 116 1.8 64 20 15 1130mm*900mm*1571mm 550
OF-18.5A 0.7 7 102 3.1 109 25 18.5 1400mm*1000mm*1200mm 600
0.8 8 116 2.8 99
1 10 145 2.5 88
OF-22A 0.7 7 102 3.7 131 30 22 1400mm*1000mm*1200mm 655
0.8 8 116 3.4 120
1 10 145 3 106
OF-30A 0.7 7 102 5.2 184 41 30 1920mm*1170mm*1320mm 1150
0.8 8 116 4.7 166
1 10 145 4.3 152
OF-37A 0.7 7 102 6.1 215 50 37 1920mm*1170mm*1320mm 1200
0.8 8 116 5.6 198
1 10 145 5 177
OF-45A 0.7 7 102 7.5 265 61 45 1920mm*1170mm*1320mm 1320
0.8 8 116 6.8 240
1 10 145 6 212
OF-55A 0.7 7 102 10 353 75 55 1930mm*1320mm*1535mm 1520
0.8 8 116 9 318
1 10 145 7.8 275
OF-75A 0.7 7 102 13 459 102 75 1930mm*1320mm*1535mm 1620
0.8 8 116 12 424
1 10 145 10 353
OF-90A 0.7 7 102 15.5 547 122 90 1930mm*1320mm*1535mm 1800
0.8 8 116 14 494
1 10 145 12.5 441
OF-110A 0.7 7 102 20 706 150 110 2150mm*1600mm*1680mm 3100
0.8 8 116 18 636
1 10 145 16 565
OF-132A 0.7 7 102 25 883 179 132 2150mm*1600mm*1680mm 3250
0.8 8 116 23 812
1 10 145 20 706
OF-160W 0.7 7 102 27 953 217 160 2860mm*1500mm*1750mm 4500
0.8 8 116 25.5 900
1 10 145 24 847
OF-185W 0.7 7 102 30 1059 251 185 2860mm*1500mm*1750mm 4500
0.8 8 116 28 989
1 10 145 25 883
OF-200W 0.7 7 102 36 1271 272 200 2860mm*1500mm*1750mm 4500
0.8 8 116 33 1165
1 10 145 27 953

*For more model,please contact the salesman person.

Packaging & Shipping



Company Profile






Are you manufacturer?
ZIQI: Yes,we are professional air compressor manufacturer over 10 years and our factory located in ZheJiang .
How long is your air compressor warranty?
ZIQI: For 1 year.
Do you provide After- sales service parts?
ZIQI: Of course, We could provide easy- consumable spares.
How long could your air compressor be used?
ZIQI: Generally, more than 10 years.
How about your price?
ZIQI: Based on high quality, Our price is very competitive in this market all over the world.
How about your customer service?
ZIQI: For email, we could reply our customers’ emails within 2 hours.
Do you support OEM?
ZIQI: YES, and we also provide multiple models to select.

How to get quicker quotation?

When you send us inquiry, please confirm below information at the same time:
* What is the air displacement (m3/min,cfm/min)?
* What is the air pressure (mpa,bar,psi)?
* What is the voltage in your factory (v/p/Hz)?
* It is ok if you need air tank, air dryer and filters.
This information is helpful for us to check suitable equipment solution and quotation quickly.

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After-sales Service: Online Support
Warranty: 1 Year
Lubrication Style: Oil-free
Cooling System: Air Cooling
Power Source: AC Power
Cylinder Position: Vertical


air compressor

How Does Variable Speed Control Work in Screw Compressors?

Variable speed control in screw compressors is a technology that allows the compressor’s rotational speed to be adjusted according to the compressed air or gas demand. This control method offers several benefits in terms of energy efficiency and system performance. Here’s a detailed explanation:

Variable speed control, also known as variable frequency drive (VFD) or inverter control, works by adjusting the speed of the compressor’s drive motor. The drive motor is typically an electric motor that powers the rotation of the compressor’s screw rotors.

The key components and operation of variable speed control in screw compressors are as follows:

  • 1. Drive Motor: The drive motor is connected to the compressor’s screw rotors and provides the rotational power required for compression. It is an electric motor capable of operating at variable speeds.
  • 2. Inverter or Variable Frequency Drive (VFD): The inverter or VFD is an electronic device that controls the speed of the drive motor. It converts the incoming electrical power into adjustable frequency and voltage, allowing precise control of the motor’s rotational speed.
  • 3. Control System: The control system of the screw compressor monitors and adjusts the speed of the drive motor based on the compressed air or gas demand. It receives input signals from sensors that measure parameters such as pressure, flow rate, or system demand, and sends corresponding signals to the inverter or VFD to regulate the motor speed.
  • 4. Speed Adjustment: When the demand for compressed air or gas decreases, the control system reduces the motor speed by decreasing the frequency and voltage supplied by the inverter or VFD. This results in a lower rotational speed of the screw rotors, reducing the compression capacity and power consumption of the compressor.
  • 5. Energy Efficiency: Variable speed control allows the compressor to match the output to the actual demand, avoiding energy wastage associated with constant-speed compressors. By operating at lower speeds during periods of lower demand, energy consumption can be significantly reduced. This energy-saving capability is particularly advantageous in applications with varying air or gas requirements.
  • 6. Smooth Operation: Variable speed control enables smooth and gradual motor acceleration and deceleration, minimizing mechanical stress on the compressor components and reducing the likelihood of sudden pressure surges or system shutdowns.
  • 7. System Stability: By adjusting the compressor’s speed to match the demand, variable speed control helps maintain stable system pressure and prevents excessive cycling of the compressor. This contributes to improved system performance and longevity.

It’s worth noting that variable speed control is more commonly found in larger screw compressors used in industrial and commercial applications. Smaller screw compressors may utilize fixed-speed motors due to cost considerations or simpler system requirements.

Overall, variable speed control in screw compressors offers precise capacity modulation, improved energy efficiency, enhanced system stability, and reduced maintenance requirements, making it a preferred choice in many applications where compressed air or gas demand fluctuates.

air compressor

Can Screw Compressors Be Used for Medical Air Supply?

Yes, screw compressors can be used for medical air supply. Here’s a detailed explanation:

Screw compressors are commonly employed in various applications, including medical air supply systems. Medical air is a critical utility in healthcare facilities, used for various purposes such as respiratory therapy, anesthesia, and surgical tools. Here are some key points to consider:

1. Reliability and Efficiency:

Screw compressors are known for their reliability and efficiency. They can provide a continuous and reliable source of compressed air, ensuring a stable supply for medical applications. The rotary screw design allows for smooth and efficient compression, minimizing energy consumption and maximizing system performance.

2. Oil-Free Operation:

In medical applications, it is crucial to ensure the purity of the compressed air. Screw compressors can be designed and certified to provide oil-free air, eliminating the risk of oil contamination in the medical air supply. Oil-free screw compressors incorporate specialized sealing systems and filtration to prevent oil carryover, making them suitable for medical air applications.

3. Air Quality Standards:

Medical air must meet specific air quality standards to ensure patient safety and treatment effectiveness. Standards such as the European Pharmacopoeia (Ph. Eur.) or the United States Pharmacopeia (USP) define the required purity levels for medical air, including limits on particulate matter, moisture content, and microbial contamination. Screw compressors can be equipped with appropriate filtration and purification systems to meet these standards.

4. Integrated Drying and Filtration:

Some screw compressors designed for medical air applications incorporate integrated drying and filtration systems. These systems remove moisture and contaminants from the compressed air, ensuring it meets the required quality standards. Integrated drying systems can include refrigerated dryers, desiccant dryers, or membrane dryers, depending on the specific needs of the medical air supply system.

5. Redundancy and Backup Systems:

Medical air supply systems often require a high level of reliability and continuity. Screw compressors can be configured with redundancy and backup systems to ensure uninterrupted supply. Multiple compressors can be installed in parallel, with automatic switching mechanisms to maintain supply in case of a compressor failure or maintenance activities.

6. Monitoring and Alarms:

Modern screw compressors used in medical air supply systems often feature advanced monitoring capabilities. They can continuously monitor and record key parameters such as pressure, temperature, and system performance. Alarms and alerts can be configured to notify operators or maintenance personnel in case of abnormal conditions or potential issues with the compressor.

7. Compliance with Standards and Regulations:

When using screw compressors for medical air supply, it is essential to comply with relevant standards and regulations. These may include medical device regulations, electrical safety standards, and guidelines specific to medical gas systems. Compliance ensures that the medical air supply system meets the necessary safety and quality requirements.

In summary, screw compressors can be used for medical air supply, providing reliable and efficient compressed air for various medical applications. With their reliability, oil-free operation, adherence to air quality standards, integrated drying and filtration capabilities, and the ability to incorporate redundancy and monitoring features, screw compressors are well-suited for medical air supply systems in healthcare facilities.

air compressor

Can Screw Compressors Handle High-Pressure Applications?

Yes, screw compressors are capable of handling high-pressure applications. Here’s a detailed explanation:

Screw compressors are known for their ability to deliver high-pressure compressed air or gas. The design of screw compressors allows them to achieve higher pressure ratios compared to other types of compressors, such as reciprocating piston compressors.

The compression process in screw compressors is continuous and smooth, which enables them to handle high-pressure requirements efficiently. The intermeshing rotors create compression chambers that gradually reduce in volume, resulting in the compression of air or gas. By adjusting the rotational speed of the rotors and optimizing the design parameters, screw compressors can generate the desired high discharge pressures.

However, it’s important to note that the maximum pressure capability of a screw compressor may vary depending on factors such as:

  • 1. Compressor Design: The design features of the screw compressor, including the rotor profile, sealing mechanism, and cooling system, can influence its maximum pressure capacity.
  • 2. Rotor Size and Speed: The size and rotational speed of the rotors impact the compression ratio and, consequently, the achievable discharge pressure. Larger rotors and higher rotational speeds generally allow for higher pressure ratios.
  • 3. Drive Power: The power of the drive motor connected to the screw compressor affects its ability to handle high-pressure applications. Adequate power is necessary to overcome the resistance and maintain the desired compression ratio.
  • 4. Structural Integrity: The structural integrity and material strength of the compressor housing, rotors, and other components determine the maximum pressure that the compressor can withstand without failure or leakage.

It’s important to select a screw compressor with the appropriate specifications and consult the manufacturer’s guidelines to ensure that it can handle the specific high-pressure requirements of the application.

Additionally, it’s worth noting that high-pressure applications may also require additional equipment, such as pressure vessels or downstream pressure regulators, to safely handle and control the compressed air or gas at the desired pressure levels.

China OEM 7.5kw-250kw Industrial Weg Motor Rotary Direct Drive Screw Water Lubricated Oil Free Screw Air Compressor for Oxygen Plant / Food Industry/ Medical Industry   arb air compressorChina OEM 7.5kw-250kw Industrial Weg Motor Rotary Direct Drive Screw Water Lubricated Oil Free Screw Air Compressor for Oxygen Plant / Food Industry/ Medical Industry   arb air compressor
editor by CX 2024-02-07

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