Discover the unparalleled capabilities of the Large Power Oil-Lubricated Screw Compressor by a renowned China Supplier, available at factory-direct pricing. This state-of-the-art Permanent Magnet Variable Frequency Two-Stage Screw Air Compressor boasts high-quality centrifugal fans, offering remarkable energy savings and exceptional efficiency. Designed as a stationary type, this equipment promises robust performance and reliability for your industrial needs.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage compression equals the sum of the power needed for multi-stage compression. However, real-world conditions introduce additional power demands due to factors such as coupling transmission losses, bearing friction, and the cooling effects of liquid viscosity. Consequently, by minimizing the compression ratio at each stage, we can reduce unnecessary power consumption, making multi-stage compression more energy-efficient than single-stage compression.
The two-stage screw air compressor features a pair of rotary screw compressors for each stage. Each stage consists of an active screw, which drives a passive screw through an external power transmission mechanism. The first stage employs a low-pressure screw group, while the second stage utilizes a high-pressure screw group. Surrounding each screw is a sealing air film. During operation, the gas undergoes three processes-suction, pressurization, and exhaust-resulting in efficient compression.
First Stage Compression: The initial stage of the two-stage screw air compressor uses a low-pressure screw group to compress the gas. The gas is drawn into the screw compression chamber via the suction valve. As the screw rotor spins at high speed, the gas is gradually compressed and transferred to the second stage.
Second Stage Compression: Within the second stage, the gas is further compressed in a tighter screw space, subject to higher temperature and pressure. The exhaust valve opens to release the high-pressure gas, completing the second stage of compression.
Initially, natural air is drawn into the first stage of compression via an air filter. Here, it mixes with a small amount of lubricating oil in the compression chamber and is compressed to interstage pressure. The compressed gas then passes through a cooling channel, where it encounters substantial oil mist, significantly reducing its temperature. This cooled, compressed gas enters the second-stage rotor for two-stage compression, ultimately reaching the final exhaust pressure before being expelled through the exhaust valve, completing the compression process.
| Sanzhi (Henan) Compressor Co,. Ltd. |
| Two-Stage Compression Permanent Magnet Variable Frequency Screw Air Compressor |
| 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. |
The centrifugal fan harnesses a high-speed rotating impeller to expertly accelerate and decelerate the air. This results in the air entering the impeller from the axial direction, allowing it to reduce the motor's temperature faster than a general air-cooled fan. This ensures continuous compressor operation and significantly extends the compressor's service life.
1) High Efficiency of PM Motor:The constant torque range and weak magnetic range are notably wider. The efficiency of the permanent magnet motor surpasses that of a regular motor by 20-30%. Even when operating away from the rated frequency, it maintains consistent, extremely high efficiency.
2) Motor Maintenance-Free:The permanent magnet motor is designed without bearings, eliminating maintenance and replacement costs associated with motor bearings.
3) Integrated Frequency Converter:Our system incorporates China's leading frequency system, offering a wide range of speed regulation with high precision. It adjusts frequencies according to actual gas demand, leading to remarkable energy-saving effects in the air compressor.
4) No Transmission Loss:The permanent magnet motor and compressor feature an embedded integrated shaft directly connected structure. This compact design eliminates the need for couplings and other transmission parts, achieving 100% transmission efficiency.
5) Variable Frequency Start and Soft Startare actualized, significantly reducing the impact on power grid equipment and preventing damage to electrical gear.
6) Reduced Energy Consumption:With a frequency conversion range of 25% to 100% (ordinary conversion ranges from 50% to 100%), it saves over 30% energy compared to fixed-speed air compressors. Compared to ordinary variable frequency air compressors, it saves approximately 5% more energy. The more the system's gas consumption fluctuates, the more pronounced the energy-saving effect.
7) Two-Stage Compression Unique Air End:The two-stage compression screw machine features a uniquely designed air end, combining the first-stage and second-stage compression rotors in a single case. These rotors are directly driven by gears, enabling each stage to achieve optimal linear speed and higher compression efficiency.
8) Internal Spray Curtain Cooling Method:Utilizes a high energy-saving internal spray curtain cooling method, delivering superior cooling effects. This significantly reduces the temperature of compressed air, achieving near-isothermal compression and minimizing the pressure loss between stages, thereby improving compression efficiency.
9) Reduced Internal Leakage:By adopting two-stage compression, the compression ratio for each stage is reduced, minimizing internal leakage from high-pressure to low-pressure ends and enhancing volume efficiency.
10) Noise Reduction:Two-stage compression lowers the compression ratio, dramatically reducing noise, particularly during unloading.
11) Easy Maintenance and Service:The two-stage compressor unit, apart from the screw air end, shares similar systems and structures with single-stage compression units, simplifying maintenance and usage for users.
1. Price advantage
We offer competitive ex-factory prices directly to our customers, empowering them to stand out in the market.
2. Direct deal
All our products come straight from the factory, ensuring that you receive the most cost-effective options available.
3. OEM & ODM services
Our factory's robust production and management capabilities allow us to provide comprehensive OEM/ODM services tailored to your needs.
4. Customised service
We accommodate non-standard, export, and customized orders for voltage, power, pressure, and more. Contact us with your specific requirements.
5. Accept small order
Start with a small trial order to evaluate the superior quality of our products.
6. Fast delivery
Benefit from our high-quality products paired with prompt delivery services.
7. Complete authorisation
As an authorized distributor, you will receive full certification to market our esteemed SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd. is a distinguished manufacturer specializing in screw air compressors and vacuum pumps, boasting over a decade of industry expertise. Our expansive product lineup features normal pressure and low-pressure screw air compressors, permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, versatile single-tank and double-tank mobile screw compressors, electric and diesel mobile screw compressors, and advanced screw vacuum pumps.
Our production capabilities are unparalleled, utilizing state-of-the-art multi-air compressor assembly lines that ensure lean, modern manufacturing processes. Driven by a dedicated team of over 50 employees, we continuously refine our management systems, including ERP, to reduce lead times and ensure the swift delivery of high-quality products.
In management, we proudly uphold the ISO9001 quality management system certification. Our commitment to stringent quality control is unwavering, with meticulous inspections at every stage-material, production, and pre-delivery-ensuring each machine meets our rigorous standards.
Our customer service is second to none. Pre-sales, we provide expert guidance to help customers select the perfect air equipment for their diverse needs, offering high levels of customization in appearance and configuration. We also excel in OEM production, crafting unique products to meet dealer specifications. Post-sales, our professional sales and service team stands ready to respond swiftly to any customer inquiries.
At Sanzhi (Henan) Compressor Co., Ltd., we are committed to delivering top-notch, reliable products and fostering long-term relationships with our clients. With our efficient delivery systems, high-quality machines, and competitive pricing, we are your trusted partner for premium compressed air solutions.
Our factory is conveniently situated in Xinzheng City, Henan Province, China. We are pleased to offer transportation from Xinzheng International Airport to our facility, located just 30 kilometers away, approximately a one-hour journey. We warmly welcome you to visit our company!
Successful Cases
FAQ
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 two 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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