Discover the pinnacle of industrial excellence with the Large Power Oil-Lubricated Screw Compressor, brought to you by China's premier supplier, Sanzhi (Henan) Compressor Co., Ltd. Enjoy the unmatched benefits of Factory-direct pricing with our cutting-edge Permanent Magnet Variable Frequency Two-Stage Screw Air Compressor, meticulously engineered for unparalleled energy savings and remarkable efficiency. Featuring top-tier High-Quality Centrifugal Fans, this stationary compressor redefines reliability and performance, making it the ultimate choice for the most demanding applications.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the power needed for single-stage pressure transmission equals the cumulative power for multi-stage compression. However, in practical applications, the actual power required increases due to factors like coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity. To optimize efficiency and reduce wasted power, decreasing the compression ratio at each stage ensures that the total power needed for multi-stage compression is lower than the power required for single-stage compression.
The two-stage screw air compressor boasts a dual-stage rotary screw mechanism, featuring an active and a passive screw in each stage. The active screw, driven by an external transmission device, propels the passive screw. Initially, a low-pressure rate screw group is employed in the first stage, followed by a high-pressure rate screw group in the second stage. Each screw is enveloped by a sealing air film, guiding the gas through suction, pressurization, and exhaust processes.
First Stage Compression: The gas is initially compressed using a low-pressure rate screw group. Entering the screw compression chamber via the suction valve, the high-speed rotation of the screw rotor further compresses the gas, transferring it to the second stage.
Second Stage Compression: In this stage, the gas is funneled into a tighter screw space, where it is subjected to higher temperature and pressure. Upon reaching optimal pressure, the exhaust valve opens, releasing the high-pressure gases from the system.
Natural air is drawn into the first stage through an air filter, where it mixes with a small amount of lubricating oil in the compression chamber. The gas is compressed to interstage pressure and then cooled in the cooling channel by contact with oil mist, significantly reducing its temperature. The cooled gas then enters the second-stage rotor for further compression to the final exhaust pressure, completing the process as the high-pressure gas is discharged through the exhaust valve.
| 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. |
Experience unparalleled power with our Sanzhi High Volume Centrifugal Fan Two-Stage Air Compressor. Utilizing a high-speed rotating impeller, it expertly accelerates and decelerates air, entering axially to cool the motor more efficiently than typical air-cooled fans. This ensures continuous operation, significantly extending the compressor's life span.
1) High efficiency of PM motor:Our permanent magnet motor boasts a broader constant torque range and weak magnetic range, delivering 20-30% higher efficiency compared to standard motors. Even when operating outside the rated frequency, it maintains exceptional efficiency.
2) Maintenance-free motor:The permanent magnet motor is designed without bearings, eliminating maintenance and replacement costs associated with motor bearings.
3) Integrated frequency converter: Our compressor features China's premier frequency system, offering a broad speed regulation range and precision. It adjusts to actual gas demand, ensuring outstanding energy-saving performance.
4) No transmission loss: Featuring an embedded integrated shaft directly connected structure, our permanent magnet motor and compressor eliminate the need for couplings or transmission parts, ensuring 100% transmission efficiency.
5) Variable frequency start and soft startare achieved, significantly reducing the impact on power grid equipment and preventing electrical system damage.
6) Reduced energy consumption: Our frequency conversion ranges from 25% to 100% compared to the ordinary 50% to 100%. This results in over 30% energy savings compared to fixed-speed compressors and approximately 5% savings compared to standard variable frequency compressors. The more significant the fluctuation in system gas consumption, the more noticeable the energy-saving effect.
7) Unique two-stage compression air end:Our two-stage compression screw machine features an innovative air end design, combining first-stage and second-stage compression rotors in a single case. Driven directly by gears, each rotor achieves optimal linear speed and higher compression efficiency.
8) Internal spray curtain cooling method: Utilizing a high energy-saving internal spray curtain cooling system, it ensures excellent cooling effects, significantly reducing compressed air temperature. This achieves near-isothermal compression, lowers stage pressure loss, reduces compression ratios, and enhances efficiency.
9) Reduced internal leakage:Our two-stage compression approach lowers compression ratios for each stage, minimizes internal leakage from high to low pressure ends, and boosts volume efficiency.
10) Noise reduction:Two-stage compression reduces the compression ratio, significantly lowering noise levels, especially unloading noise.
11) Easy maintenance and service:Our two-stage compressor unit, apart from the screw air end, features systems and structures similar to single-stage compression, making maintenance straightforward and user-friendly.
1. Exceptional Price Advantage
We offer direct ex-factory prices to keep our customers at the forefront of their markets, ensuring unbeatable competitiveness.
2. Direct Transactions
With factory-direct products, we are able to deliver highly cost-effective solutions directly to you.
3. Comprehensive OEM & ODM Services
Our robust production and management capabilities allow us to provide top-tier OEM and ODM services, meticulously crafted to meet your specific needs.
4. Personalized Customization
We gladly accommodate non-standard, export, and custom orders for voltage, power, pressure, and more. Reach out to us to discuss your unique requirements.
5. Small Order Acceptance
Try a small trial order to witness the exceptional quality of our products firsthand.
6. Rapid Delivery
Enjoy the perfect combination of high-quality products and our prompt, efficient delivery services.
7. Full Authorization
For our distributors, we offer comprehensive authorization certificates, granting you the confidence to market our SANZHI brand products effectively.
Sanzhi (Henan) Compressor Co., Ltd is a distinguished manufacturer specializing in screw air compressors and screw vacuum pumps, with over a decade of unparalleled industry expertise. Our vast product portfolio includes an array of options such as normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, specialized screw air compressors for laser cutting, single-tank and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and screw vacuum pumps, among others.
Our production processes epitomize efficiency, thanks to our advanced, streamlined multi-air compressor assembly lines. With the commitment and expertise of over 50 skilled employees, we continuously refine our management systems, including ERP, to minimize lead times, ensuring the prompt delivery of superior products.
In terms of management, our factory proudly holds the ISO9001 quality management system certification. We adhere to rigorous quality management standards, enforcing stringent quality control protocols. Each machine undergoes meticulous material inspections, production assessments, and pre-delivery checks before it leaves our facility, ensuring top-notch quality.
Our customer service is second to none. Our pre-sales team provides expert guidance in selecting the optimal air equipment for various facilities, offering extensive customization options, including appearance and configuration. We also specialize in creating unique OEM products to meet specific dealer demands. Our after-sales team, consisting of seasoned sales and service professionals, guarantees quick responses to customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior and reliable products, nurturing long-term customer relationships. With our efficient delivery, high-quality machines, and competitive prices, we consistently provide outstanding compressed air solutions.
Our factory is ideally located in Xinzheng City, Henan Province, China. We offer complimentary transportation from Xinzheng International Airport to our factory, a brief 30-kilometer journey taking approximately one hour. We warmly welcome your visit!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a dedicated manufacturer of screw air compressors with over 10 years of professional experience.
Q2. How do you control quality?
A: 1. Strict inspection of raw materials.
2. Rigorous control of installation procedures.
3. Each machine undergoes a minimum of 5 hours of continuous testing before dispatch.
Q3. What information must I provide to get the suitable machine?
1. The required air delivery capacity (Unit: CFM or m³/Min).
2. The necessary working pressure (Unit: PSI, Bar, or Mpa).
3. The voltage and frequency of your location (V/Hz).
4. Any additional accessories needed, such as an air tank, filters, or air dryers.
Provide us with these details, and we will customize a solution specifically tailored 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 offers compressors in voltages of 380V/50Hz/3P, 400V/50Hz/3P, 415V/50Hz/3P, 220V/60Hz/3P, 440V/60Hz/3P, and can customize according to your requirements.
Q6. How long is the delivery time?
A: For standard voltage configurations, our lead time is a swift 15 working days post-confirmation. For non-standard voltage requirements, kindly reach out to our dedicated sales team for precise timelines tailored to your needs.
Q7. What's the payment term?
A: Our payment structure is as follows: 30% T/T in advance, 40% T/T before shipment, and the remaining 30% T/T upon receipt of the B/L copy. We conveniently accept both USD and RMB as payment currencies.
Q8. How about your warranty?
A: Our comprehensive warranty covers one year for the entire machine and extends to two years for the screw air compressor, with the exception of consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be conducted after 500 operating hours. Thereafter, subsequent maintenance is required every 2000-3000 hours, contingent on the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are meticulously engineered to operate efficiently in high-temperature environments, with a robust working temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we offer both OEM and ODM services, supported by our professional design team, making us highly adaptable to your unique specifications.
Q12. How long could your air compressor be used?
A: Our air compressors boast a robust lifespan, typically exceeding an impressive 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we provide a full range of spare parts for the machines, ensuring seamless operation.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales service, including online guidance for installation and commissioning. Additionally, we can arrange for our expert engineers to provide on-site training and installation support.
Audited Supplier 
){kind=link}