China best 4kw 5.5kw 7.5kw 11kw Belt OEM Screw Air Compressor China Factory Fix Speed Made for Industry air compressor portable

Product Description

Q1: What information do I need to provide to get the suitable machine?
1. How much air delivery capacity ( Unit:CFM or M3/Min )
2 How much working pressure ( Unit:PSI, Bar or Mpa )
3.What is the voltage and frequency of my country of residence ( V/Hz )
4. Whether I need other accessories such as air tank, filters and/or air dryers.
Tell us the answer, we will offer scheme for you!

Q2: What are the general unit conversion?
1bar = 0.1Mpa = 14.5psi 1m³/min = 35.32cfm 1KW = 1.34HP

Q3: Are you factory or trading company?
We are factory. Our factory is located in 39 Xihu (West Lake) Dis. Rd, HangZhou, ZHangZhoug

Q4: Which trade term can you accept?
FOB, CIF, CFR, EXW, etc.

Q5: How long will you take to arrange production?
15 days for Regular Products, 35 days for Customizing Models


Ambient Temperature -5ºC to +45 ºC
Max Pressure (bar) 8
Air Delivery (m3/min) 1.5
Compression Stage Single Stage Compression
Cooling Method Air Cooled
Discharge Temperature (ºC) ≤ 75ºC
Oil  Cotent (ppm) ≤3
Transmission Method Belt Driven
Sound Level dB(A) 66±3
Lubricating Oil Amount 7.5L
Motor Power 11KW/15HP
Motor Level Of Protection  IP55
Voltage 380V/3ph/50Hz
Dimensions (mm) 1050×740×1150(L*W*H)
Weight 225KG
Discharge Outlet Thread 1/2”

After-sales Service: Operation Training; Maintenance
Warranty: 2-Year-Warranty
Lubrication Style: Lubricated
Cooling System: Air Cooling
Power Source: AC Power
Installation Type: Stationary Type
US$ 800/set
1 set(Min.Order)

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air compressor

What Is the Role of Oil in Lubricated Screw Compressors?

In lubricated screw compressors, oil plays a crucial role in ensuring optimal performance, reliability, and longevity of the compressor. Here’s a detailed explanation of the role of oil in lubricated screw compressors:

Lubrication: One of the primary functions of oil in screw compressors is to provide lubrication to the moving parts, particularly the screw rotors. The oil forms a thin film between the rotors and the compressor housing, reducing friction and wear. This lubrication minimizes mechanical losses and helps maintain efficient operation by reducing energy consumption.

Sealing: Oil also acts as a sealing medium in lubricated screw compressors. The oil film created between the rotors and the compressor housing helps create a seal, preventing air or gas leakage between the high-pressure and low-pressure sides of the compressor. This sealing action is crucial for maintaining the compressors’ efficiency and preventing losses in compression performance.

Cooling: Oil plays a vital role in cooling various components of the screw compressor. As the compressed air or gas is compressed, it generates heat. The oil absorbs a significant amount of this heat and carries it away from the compression chamber. The oil then circulates through the compressor’s oil cooling system, where it dissipates the heat to the surrounding environment or through an oil cooler. Efficient oil cooling helps prevent overheating of the compressor components, ensuring reliable operation and extending the compressor’s lifespan.

Cleaning: The oil in lubricated screw compressors acts as a cleaning agent. It carries away contaminants, such as dirt, dust, and metal particles, that may enter the compressor during operation. The oil passes through filters and separators, removing these impurities and preventing them from accumulating in the compressor’s internal components. Clean oil helps maintain the integrity of the compressor’s internal parts and reduces the risk of damage or malfunctions.

Sealing Element Lubrication: In some lubricated screw compressors, the oil also serves to lubricate the sealing elements, such as the shaft seals or labyrinth seals. Proper lubrication of these seals helps maintain their effectiveness in preventing oil leakage and maintaining the separation between the oil and the compressed air or gas.

Corrosion Protection: Oil in screw compressors often contains additives that provide corrosion protection to the internal components. These additives form a protective layer on the metal surfaces, preventing corrosion caused by moisture or contaminants present in the compressed air or gas. Corrosion prevention helps maintain the compressor’s performance, efficiency, and reliability over time.

It’s important to note that lubricated screw compressors require regular oil monitoring, oil analysis, and oil changes to ensure optimal performance. The oil level, quality, and viscosity should be regularly checked and maintained within the manufacturer’s recommended specifications.

In summary, oil in lubricated screw compressors serves crucial functions such as lubrication, sealing, cooling, cleaning, sealing element lubrication, and corrosion protection. These functions collectively contribute to the efficient and reliable operation of the compressor, extending its service life and minimizing maintenance requirements.

air compressor

What Is the Role of Air Dryers in Screw Compressor Systems?

Air dryers play a crucial role in screw compressor systems by removing moisture from the compressed air. Here’s a detailed explanation:

Air contains moisture in the form of water vapor, which can be problematic when compressed. As air is compressed, its temperature rises, causing the moisture to condense into liquid water. This moisture can cause various issues within the compressed air system, including equipment corrosion, decreased efficiency, and compromised air quality.

The role of air dryers in screw compressor systems is to remove this moisture from the compressed air, ensuring dry and clean air for reliable and efficient operation. Here are the key functions and benefits of air dryers:

1. Moisture Removal:

Air dryers extract moisture from the compressed air, reducing its dew point temperature. By lowering the dew point, the risk of condensation and subsequent issues, such as corrosion and water damage to pneumatic equipment, is minimized. Dry air is essential for maintaining the integrity and longevity of the system components.

2. Protection of Pneumatic Equipment:

Moisture in the compressed air can negatively impact pneumatic equipment, including valves, actuators, and air tools. It can cause rust, corrosion, and malfunctioning of these components. By using air dryers to remove moisture, the risk of damage to the equipment is significantly reduced, extending their lifespan and ensuring reliable performance.

3. Prevention of Contamination:

Moisture in compressed air can also lead to the growth of microorganisms, such as bacteria and fungi, within the system. These contaminants can contaminate the air and pose a health risk or cause product spoilage in sensitive applications, such as food and pharmaceutical industries. Air dryers help prevent the growth of these contaminants, ensuring clean and safe compressed air.

4. Enhanced Efficiency:

Dry compressed air improves the efficiency of the overall system. Moisture in the air can cause pressure drop issues, affecting the performance of pneumatic tools and equipment. Dry air allows for optimal operation, reducing energy consumption and enhancing system efficiency.

5. Reduced Maintenance and Downtime:

Moisture-related issues can lead to increased maintenance requirements and system downtime. By removing moisture with air dryers, the need for frequent maintenance and repairs caused by water-related problems is minimized. This helps in reducing costly downtime and improving productivity.

There are different types of air dryers commonly used in screw compressor systems:

a) Refrigerated Air Dryers: These dryers cool the compressed air, causing moisture to condense and separate from the air stream. The condensed water is then drained from the system, leaving behind dry air.

b) Desiccant Air Dryers: These dryers utilize desiccant materials, such as silica gel or activated alumina, to adsorb moisture from the compressed air. The desiccant material undergoes a regeneration process to remove the accumulated moisture, ensuring continuous drying of the compressed air.

c) Membrane Air Dryers: These dryers use permeable membranes to selectively remove moisture from the compressed air. The membranes allow water vapor to pass through while retaining dry air, effectively drying the compressed air stream.

The selection of the appropriate air dryer depends on factors such as the desired level of moisture removal, the specific application requirements, and the operating conditions of the screw compressor system.

In summary, air dryers play a vital role in screw compressor systems by removing moisture from the compressed air. They protect equipment, prevent contamination, enhance efficiency, and reduce maintenance and downtime. By ensuring dry and clean compressed air, air dryers contribute to the longevity, reliability, and optimal performance of the entire compressed air system.

air compressor

What Is a Screw Compressor?

A screw compressor is a type of positive displacement compressor that operates based on the principle of rotary motion. Here’s a detailed explanation:

Working Principle:

A screw compressor consists of two helical rotors, typically called male and female rotors, that rotate in opposite directions within a housing. The rotors have specially designed profiles that interlock with each other, creating a series of compression chambers as they rotate. As the rotors rotate, the volume of these chambers decreases, compressing the air or gas trapped inside.

Compression Process:

As the air or gas enters the screw compressor, it gets trapped between the rotors’ lobes or threads. As the rotors continue to rotate, the trapped air or gas is carried along the length of the rotors and gradually compressed. The compression occurs continuously and smoothly as the air or gas moves from the suction side to the discharge side of the compressor. The interlocking rotors ensure a continuous flow of compressed air or gas without pulsation.

Oil-Injected and Oil-Free Variants:

Screw compressors are available in both oil-injected and oil-free variants. In oil-injected screw compressors, a small amount of lubricating oil is injected into the compression chamber to provide lubrication, cooling, and sealing between the rotors. The oil also helps in reducing friction and minimizing wear. Oil-injected screw compressors are commonly used in various industrial applications where a small amount of oil in the compressed air is acceptable.

On the other hand, oil-free screw compressors are designed to operate without the need for oil lubrication. These compressors use specialized rotor coatings, such as PTFE (polytetrafluoroethylene) or other non-stick materials, to reduce friction and prevent the need for oil. Oil-free screw compressors are often favored in applications where oil-free and contaminant-free compressed air is essential, such as in food and beverage, pharmaceutical, and electronics industries.


Screw compressors are widely used in various industries for a range of applications. They are commonly employed in manufacturing plants, refineries, power generation facilities, and other industrial settings to supply compressed air or gas for pneumatic tools, process equipment, air conditioning systems, and more. The ability of screw compressors to deliver a continuous flow of compressed air or gas makes them suitable for applications that require a steady and reliable source of compressed air.


Screw compressors offer several advantages compared to other types of compressors. They provide high efficiency and can deliver a large volume of compressed air or gas. The continuous compression process results in smooth operation with minimal pulsation. Additionally, screw compressors are known for their compact design, low vibration levels, and relatively quiet operation.

In summary, a screw compressor is a rotary positive displacement compressor that uses interlocking helical rotors to compress air or gas. It operates based on a continuous compression process and is available in both oil-injected and oil-free variants. Screw compressors find widespread use in various industries for applications that require a reliable source of compressed air or gas.

China best 4kw 5.5kw 7.5kw 11kw Belt OEM Screw Air Compressor China Factory Fix Speed Made for Industry   air compressor portableChina best 4kw 5.5kw 7.5kw 11kw Belt OEM Screw Air Compressor China Factory Fix Speed Made for Industry   air compressor portable
editor by CX 2023-10-04

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