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China factory 90kw Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor for Industry with Great quality

Product Description

Low-Pressure Compressor Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor for Industry, 15KW, 22KW, 30KW, 37KW, 45KW, 55KW, 75KW, 90KW, 110KW, 132KW, 160KW, 185KW, 200KW, 250KW


Product Structure

Internal Structure Frontside

Internal Structure Backside

Working Principle

In an ideal air compression process, the power required for single-stage pressure transmission is equal to the sum of the power required for multi-stage compression. However, in the actual compression process, the actual working power will become larger due to the transmission power loss of the coupling, the friction coefficient of the bearing and the cooling effect of liquid viscosity and other factors. Therefore, useless power can be reduced by reducing the compression ratio of each stage, so that the total power required for multi-stage compression is less than that required for single-stage compression.

The two-stage screw air compressor is composed of a two-stage rotary screw compressor. Each stage has an active screw and a passive screw. The active screw drives the passive screw to rotate through an external power transmission device. The first stage of the two-stage screw air compressor uses a low-pressure rate screw group, and the second stage uses a high-pressure rate screw group. There is a sealing air film around each screw. While rotating, the gas is compressed through 3 processes: suction, pressurization, and exhaust.

First stage compression: The first stage of the two-stage screw air compressor uses a low-pressure rate screw group, and the gas is squeezed between them. The gas enters the screw compression chamber through the suction valve. Under the high-speed rotation of the screw rotor, the gas is gradually squeezed out and transferred to the second stage.

Second stage compression: In the second stage screw group, the gas enters a tighter screw space and is squeezed at higher temperature and pressure. The exhaust valve will open, removing high-pressure gases from the system.

Natural air enters the first stage of compression through the air filter, mixes with a small amount of lubricating oil in the compression chamber, and simultaneously compresses the mixed gas to the interstage pressure. The compressed gas enters the cooling channel and comes into contact with a large amount of oil mist, thereby greatly reducing the temperature. The cooled compressed gas enters the second-stage rotor, undergoes two-stage compression, and is compressed to the final exhaust pressure. Finally, the compressor is discharged through the exhaust valve to complete the entire compression process.


Detailed Photos



1) High efficiency of PM motor: The constant torque range and weak magnetic range are wider, The efficiency of the permanent magnet motor is higher by 20-30% than that of the regular motor. When the permanent magnet motor operates away from the rated frequency, its efficiency is basically unchanged, and it can still maintain extremely high motor efficiency.

2)Two-stage compression unique air end: The two-stage compression screw machine has a unique design for the air end. It combines the first-stage compression rotor and the second-stage compression rotor in a case, and rotates them directly through gears respectively, so that each stage of the rotor can obtain the best linear speed, so that the compression efficiency is higher.

3)Integrated frequency converter: Adopt the top frequency system in China, with a wide range of speed regulation, and high precision, according to the user’s actual gas demand frequency modulation operation, the air compressor energy saving effect is remarkable.

4)Reduce internal leakage: Two-stage compression is adopted, which reduces the compression ratio of each compression, reduces the internal leakage from the high-pressure end to the low-pressure end, and improves the volume efficiency.

5)Variable frequency start and the soft start of the motor are realized, which greatly reduce the impact on the power grid equipment and do not cause damage to the electrical equipment.

6)Reduce energy consumption: Frequency conversion range from 25% to 100% (ordinary frequency conversion from 50% to 100%), compared with fixed speed air compressor, energy saving up to more than 30%; Compared with the ordinary variable frequency air compressor, the energy saving is about 5%. And the larger the fluctuation of the system gas consumption, the more obvious the energy-saving effect.

7)No transmission loss: the permanent magnet motor and the compressor adopt the embedded integrated shaft directly connected structure, which is more compact in structure. There is no coupling and other transmission parts, and the transmission efficiency is 100%.

8)Air cooling method: using high energy saving air cooling method, good cooling effect, greatly reduces the temperature of compressed air, achieves close to isothermal compression, but also can reduce the pressure loss between the first and second, reduce the compression ratio, improve the compression efficiency.

9)Smart Touch Controller: Superior built-in intelligence requires minimal manual operation. A high-precision color electronic screen, clear graphics display, and indication of maintenance information, fault alarms, and safety shutdown alarms.

10)Special Type Intake Valve: Automatic control of the opening, to ensure the engine fuel injection and lubricating oil circulation.
Ultra-low oil circuit loss, overall efficiency improvement.
Normally open solenoid valve control, emergency stop automatically closed, prevent oil injection.

11)Excellent Air Filter: An air filter with excellent air purification capability ensures a clean air system and three-stage filtration to maximize air purification and meet standard emissions, it can remove a lot of steam and a small amount of dust gas occasions.

12)High-Quality Soundproof Cotton: Compact noise reduction housing, achieving no vibration amplitude during operation, cooperates with high-quality soundproof cotton to further improve noise reduction levels.

13)Motor maintenance-free: The permanent magnet motor has no bearings inside, which eliminates the cost of motor bearing maintenance and replacement.

14)Noise reduction: Two-stage compression reduces the compression ratio and greatly reduces the noise, especially the unloading noise.

15)Easy to do maintenance and service: Two-stage compressor unit, except the screw air end, other systems and structures of the unit are basically the same as single-stage compression, which brings convenience to the maintenance and use of users.


Product Parameters

Model Power Exhaust pressure Free air delivery* of unit at working pressure Voltage Frequency Air outlet discharge size Weight Dimensions
KW Mpa m³/min V Hz Inch Kg L*W*H(mm)
SZ15VF-II 15 0.5 4.00 380 50 G1½ 660 1450*780*1180
0.8 3.00
1.3 2.00
SZ19VF-II 18.5 0.5 5.00 380 50 G1½ 680 1450*780*1180
0.8 4.00
1.3 3.80
1.6 2.20
SZ22VF-II 22 0.5 6.60 380 50 G1½ 730 1650*880*1280
0.8 4.20
1.3 3.00
1.6 2.50
SZ30VF-II 30 0.5 7.00 380 50 G1½ 980 2000*1260*1560
0.8 6.40
1.3 4.00
1.6 3.00
SZ37VF-II 37 0.5 10.00 380 50 G1½ 1080 2000*1260*1560
0.8 7.00
1.3 5.50
1.6 4.00
SZ45VF-II 45 0.5 13.00 380 50 G2 1980 2000*1260*1560
0.8 10.00
1.3 6.50
1.6 5.00
SZ55VF-II 55 0.5 17.00 380 50 G2 2180 2150*1300*1730
0.8 12.00
1.3 8.60
1.6 5.00
SZ75VF-II 75 0.5 20.00 380 50 G2 2280 2150*1300*1730
0.8 16.50
1.3 11.00
1.6 9.00
SZ90VF-II 90 0.5 24.00 380 50 DN65 3200 2700*1920*1820
0.8 20.00
1.3 14.00
1.6 11.00
SZ110VF-II 110 0.5 28.00 380 50 DN65 3360 2700*1920*1820
0.8 24.50
1.3 18.00
1.6 14.00
                                                                Due to product updates, the above parameters are subject to deviation in kind.


Our Advantages

1. Price advantage

Direct to provide customers with ex-factory prices, so that customers are more competitive.

2. Direct deal
All products are supplied directly from the factory and we will offer more cost-effective products.

3. OEM & ODM services
The strong production and management capacity of the factory can provide OEM/ODM service for you.

4. Customised service
We accept non-standard orders, export orders, voltage/power/pressure, etc, which can be customized. If you have demands, please contact us.

5. Accept small order
You can place a small trial order first to test the quality of our products.

6. Fast delivery
High-quality products with timely delivery.

7. Complete authorisation
For distributors, we can provide the full authorization certificate to allow you to sell our SANZHI brand products.


Packaging & Shipping

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Company Profile

Sanzhi (ZheJiang ) Compressor Co., Ltd is a manufacturer in the production of screw air compressors and screw vacuum pumps, with more than 10 years of experience. The extensive product range includes normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors for laser cutting, single-tank mobile screw air compressors, double-tank mobile screw air compressor, electric mobile screw air compressor, diesel mobile screw air compressor, screw vacuum pump, etc.

In production, we are able to achieve the most efficient production by multi-air compressor assembly lines which are lean and modern. With the effort of over 50 employees, we continue to optimize management systems such as ERP to shorten the lead time and deliver qualified products at a fast speed.

In management, our factory passed ISO9001 quality management system certification. We always adhere to the implementation of the stringent quality management system, and strictly implement the standard quality control processes. The outgoing of each machine is an experience of material inspection, production inspection and pre-delivery inspection.

In customer service, on the hand of pre-sales, we offer our customers a professional guide to choosing air equipment for multiple facilities and supply with high customization like its appearance and allocation, and we are even able to create unique products to meet dealer’s demand, that is OEM. Meanwhile, for after-sales, we staffed a professional sales & service team for quick response to customers.

We Sanzhi (ZheJiang ) Compressor Co., Ltd, devote ourselves to delivering superior and stable products, for building long-term relationships with our customers. Efficient delivery, qualified machine, and worthy price, we are reliable to provide you with a satisfactory compressed air solution.

Our factory is located in HangZhou City, ZheJiang Province, China. We can pick you up from HangZhou International Airport to our factory, 30 kilometers in about 1 hour. Welcome to our company!



Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors, with more than 10 years of experience.

Q2. How do you control quality?
A: 1. The raw materials are strictly inspected.
  2. Installation procedures are strictly controlled.
  3. Each machine must pass at least 5 hours of continuous testing before leaving the factory.

Q3. What information must I 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 an air tank, filters, and/or air dryers.
Tell us the answer, we will offer a scheme for you!

Q4. What is the general unit conversion?
1Bar = 0.1Mpa = 14.5PSI
1m³/min = 35.32cfm
1KW = 1.34HP

Q5. What is the available voltage air compressor?
A: Sanzhi available voltage include 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, and can be customized according to your requirements.

Q6. How long is the delivery time?
A: For standard voltage,15 working days after the confirmed order. Non-standard, please contact our sales.

Q7. What’s the payment term?
A: 30% T/T in advance, 40% T/T before shipment, and 30% T/T against the B/L copy. USD, RMB can be accepted.

Q8. How about your warranty?
A: One year for the whole machine and 2 years for screw air compressor, except for consumable spare parts.

Q9. What about the maintenance?
A: First maintenance needs to be done after 500 hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.

Q10. Can machines be run in high-temperature environment?
A: Yes, machines would run in high-temperature environment countries. Working temperature from -20° to 45°(-4ºF-113ºF).

Q11. Do you offer OEM service?
A: Yes, with a professional design team, both OEM & ODM orders are highly welcome.

Q12. How long could your air compressor be used?
A: Generally, more than 10 years.

Q13. Will you provide some spare parts for the machines?
A: Yes, of course.

Q14. How about your after-sales service?
A: Provide customers with installation and commissioning online instructions, and arrange for our engineers to help you with training and installation.
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Brand Name: Sanzhi
Power: 90kw
Exhaust Pressure: 0.5-1.6 MPa
US$ 13000/Piece
1 Piece(Min.Order)


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Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

air compressor

What are the advantages of using an air compressor in construction?

Using an air compressor in construction offers numerous advantages that contribute to increased efficiency, productivity, and versatility. Here are some key benefits of using air compressors in construction:

  • Powering Pneumatic Tools: Air compressors are commonly used to power a wide range of pneumatic tools on construction sites. Tools such as jackhammers, nail guns, impact wrenches, drills, and sanders can be operated using compressed air. Pneumatic tools are often preferred due to their lightweight, compact design and ability to deliver high torque or impact force.
  • Efficient Operation: Air compressors provide a continuous and reliable source of power for pneumatic tools, allowing for uninterrupted operation without the need for frequent battery changes or recharging. This helps to maintain a smooth workflow and reduces downtime.
  • Portability: Many construction air compressors are designed to be portable, featuring wheels or handles for easy maneuverability on job sites. Portable air compressors can be transported to different areas of the construction site as needed, providing power wherever it is required.
  • Versatility: Air compressors are versatile tools that can be used for various applications in construction. Apart from powering pneumatic tools, they can also be utilized for tasks such as inflating tires, cleaning debris, operating air-operated pumps, and powering air horns.
  • Increased Productivity: The efficient operation and power output of air compressors enable construction workers to complete tasks more quickly and effectively. Pneumatic tools powered by air compressors often offer higher performance and faster operation compared to their electric or manual counterparts.
  • Cost Savings: Air compressors can contribute to cost savings in construction projects. Pneumatic tools powered by air compressors are generally more durable and have longer lifespans compared to electric tools. Additionally, since air compressors use compressed air as their power source, they do not require the purchase or disposal of batteries or fuel, reducing ongoing operational expenses.
  • Reduced Electrocution Risk: Construction sites can be hazardous environments, with the risk of electrocution from electrical tools or equipment. By utilizing air compressors and pneumatic tools, the reliance on electrical power is minimized, reducing the risk of electrocution accidents.

It is important to select the appropriate air compressor for construction applications based on factors such as required air pressure, volume, portability, and durability. Regular maintenance, including proper lubrication and cleaning, is crucial to ensure the optimal performance and longevity of air compressors in construction settings.

In summary, the advantages of using air compressors in construction include powering pneumatic tools, efficient operation, portability, versatility, increased productivity, cost savings, and reduced electrocution risk, making them valuable assets on construction sites.

air compressor

How are air compressors utilized in pneumatic tools?

Air compressors play a crucial role in powering and operating pneumatic tools. Here’s a detailed explanation of how air compressors are utilized in pneumatic tools:

Power Source:

Pneumatic tools rely on compressed air as their power source. The air compressor generates and stores compressed air, which is then delivered to the pneumatic tool through a hose or piping system. The compressed air provides the force necessary for the tool to perform various tasks.

Air Pressure Regulation:

Air compressors are equipped with pressure regulation systems to control the output pressure of the compressed air. Different pneumatic tools require different air pressure levels to operate optimally. The air compressor’s pressure regulator allows users to adjust the output pressure according to the specific requirements of the pneumatic tool being used.

Air Volume and Flow:

Air compressors provide a continuous supply of compressed air, ensuring a consistent air volume and flow rate for pneumatic tools. The air volume is typically measured in cubic feet per minute (CFM) and determines the tool’s performance capabilities. Higher CFM ratings indicate that the pneumatic tool can deliver more power and operate at a faster rate.

Tool Actuation:

Pneumatic tools utilize compressed air to actuate their mechanical components. For example, an air-powered impact wrench uses compressed air to drive the tool’s internal hammer mechanism, generating high torque for fastening or loosening bolts and nuts. Similarly, air-powered drills, sanders, nail guns, and spray guns rely on compressed air to power their respective operations.


One of the significant advantages of pneumatic tools is their versatility, and air compressors enable this flexibility. A single air compressor can power a wide range of pneumatic tools, eliminating the need for separate power sources for each tool. This makes pneumatic tools a popular choice in various industries, such as automotive, construction, manufacturing, and woodworking.


Air compressors come in different sizes and configurations, offering varying degrees of portability. Smaller portable air compressors are commonly used in applications where mobility is essential, such as construction sites or remote locations. The portability of air compressors allows pneumatic tools to be used in various work environments without the constraints of being tethered to a fixed power source.

Overall, air compressors are integral to the functionality and operation of pneumatic tools. They provide the necessary power, air pressure regulation, and continuous airflow required for pneumatic tools to perform a wide range of tasks efficiently and effectively.

air compressor

In which industries are air compressors widely used?

Air compressors find extensive usage across various industries due to their versatility and ability to generate compressed air. Here are some industries where air compressors are widely employed:

1. Manufacturing: Air compressors are essential in manufacturing processes for powering pneumatic tools and equipment. They are used for tasks such as operating assembly lines, powering robotic machinery, running paint sprayers, and driving pneumatic actuators.

2. Construction: Air compressors play a crucial role in the construction industry. They power pneumatic tools like jackhammers, nail guns, impact wrenches, and concrete breakers. Compressed air is also used for concrete spraying, sandblasting, and operating air-powered lifts and hoists.

3. Automotive: Air compressors are widely used in automotive manufacturing and repair. They power air tools used in auto body shops, tire inflation equipment, pneumatic lifts, and air-operated brake systems. Compressed air is also utilized in vehicle painting and drying processes.

4. Oil and Gas: The oil and gas industry extensively relies on air compressors for various applications. They are used for pneumatic drilling, powering pneumatic tools in refineries and petrochemical plants, operating pneumatic valves and actuators, and providing instrument air for control systems.

5. Food and Beverage: Air compressors are employed in the food and beverage industry for tasks such as packaging, bottling, and sealing. They power pneumatic conveying systems, control air pressure in food processing equipment, and provide clean compressed air for food handling and storage.

6. Pharmaceutical and Healthcare: Air compressors find application in pharmaceutical manufacturing and healthcare facilities. They are used for operating medical equipment, such as ventilators and dental tools. Compressed air is also utilized in pharmaceutical processes, including tablet coating, fluid bed drying, and aseptic packaging.

7. Aerospace: The aerospace industry relies on air compressors for various applications, including aircraft maintenance and assembly. They power pneumatic tools for aircraft repair, provide compressed air for cleaning and pressurizing systems, and support ground operations, such as tire inflation and aircraft de-icing.

8. Mining: Air compressors are extensively used in the mining industry. They power pneumatic tools for drilling, rock blasting, and excavation. Compressed air is also utilized for ventilation, conveying materials, and operating underground equipment.

9. Energy and Utilities: Air compressors play a vital role in the energy and utilities sector. They are used in power generation plants for pneumatic control systems, instrument air, and operating pneumatic valves. Compressed air is also employed for cleaning and maintenance purposes.

These are just a few examples of the industries where air compressors are widely utilized. The versatility and reliability of air compressors make them indispensable in numerous applications across diverse sectors.

China factory 90kw Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor for Industry   with Great qualityChina factory 90kw Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor for Industry   with Great quality
editor by CX 2024-04-26