Discover the ultimate in industrial performance with the Large Power Oil-Lubricated Screw-Compressor from China's leading supplier-Sanzhi (Henan) Compressor Co., Ltd. Offering Factory-direct pricing, this Permanent Magnet Variable Frequency Two-Stage Screw Air Compressor is engineered for unmatched energy savings and high efficiency. Equipped with premium High-Quality Centrifugal Fans, this stationary type compressor sets the standard for reliability and performance in demanding applications.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission equals the sum of the power needed for multi-stage compression. However, in real-world scenarios, the actual working power increases due to factors such as coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity. To minimize wasted power, reducing the compression ratio of each stage ensures the total power needed for multi-stage compression is less than that for single-stage compression.
The two-stage screw air compressor features a dual-stage rotary screw mechanism, each with an active and a passive screw. The active screw, powered by an external transmission device, drives the passive screw. The first stage employs a low-pressure rate screw group, while the second stage uses a high-pressure rate screw group. Each screw is surrounded by a sealing air film, compressing the gas through suction, pressurization, and exhaust processes as they rotate.
First Stage Compression: Utilizing a low-pressure rate screw group, the gas is initially compressed. The gas enters the screw compression chamber via the suction valve. The high-speed rotation of the screw rotor further compresses the gas and transfers it to the second stage.
Second Stage Compression: In the second stage, the gas enters a tighter screw space where it is compressed at higher temperature and pressure. The exhaust valve then opens, releasing the high-pressure gases from the system.
Natural air is drawn into the first stage through an air filter, mixing 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 coming into contact with oil mist. This significantly reduces the temperature before the cooled gas enters the second-stage rotor for further compression to the final exhaust pressure. The entire compression process concludes as the compressor discharges the high-pressure gas 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 the power of our High Volume Centrifugal Fan Two-Stage Air Compressor, where a high-speed rotating impeller expertly accelerates and decelerates the air. Air enters the impeller axially, rapidly cooling the motor more efficiently than typical air-cooled fans. This ensures continuous compressor operation and significantly extends its service life.
1) High efficiency of PM motor:The permanent magnet motor offers a wider constant torque range and weak magnetic range, delivering 20-30% higher efficiency compared to regular motors. Even when operating away from the rated frequency, it maintains exceptional motor efficiency.
2) Motor maintenance-free:With no bearings inside, the permanent magnet motor eliminates the costs associated with motor bearing maintenance and replacement.
3) Integrated frequency converter: Our compressor features the premier frequency system in China, offering a broad speed regulation range and high precision. It adjusts to the user's actual gas demand, providing outstanding energy-saving performance.
4) No transmission loss: The permanent magnet motor and compressor utilize an embedded integrated shaft directly connected structure, creating a more compact design. This lack of couplings or other transmission parts ensures 100% transmission efficiency.
5) Variable frequency start and soft startare achieved, significantly reducing the impact on power grid equipment and preventing damage to electrical systems.
6) Reduce energy consumption: Frequency conversion ranges from 25% to 100% (compared to ordinary frequency conversion from 50% to 100%). This results in energy savings of over 30% when compared to fixed-speed air compressors. Compared to standard variable frequency air compressors, the energy savings are approximately 5%. The more significant the fluctuation in system gas consumption, the more noticeable the energy-saving effect.
7) Two-stage compression unique air end:Our two-stage compression screw machine features a uniquely designed air end, combining the first-stage and second-stage compression rotors in a single case. They are driven directly by gears, allowing each rotor to achieve optimal linear speed and higher compression efficiency.
8) Internal spray curtain cooling method: Utilizing a high energy-saving internal spray curtain cooling method, this system ensures excellent cooling effects, significantly reducing the temperature of compressed air. This achieves near-isothermal compression, lowers pressure loss between stages, reduces the compression ratio, and enhances compression efficiency.
9) Reduce internal leakage:Our two-stage compression approach lowers the compression ratio for each stage, minimizes internal leakage from high-pressure to low-pressure ends, and boosts volume efficiency.
10) Noise reduction:Two-stage compression reduces the compression ratio, which in turn significantly lowers noise levels, particularly unloading noise.
11) Easy maintenance and service:With a two-stage compressor unit, apart from the screw air end, other systems and structures remain similar to those in single-stage compression, making maintenance and user servicing straightforward and convenient.
1. Exceptional Price Advantage
We offer direct ex-factory prices, ensuring our customers stay highly competitive in their markets.
2. Direct Transactions
Our products come straight from the factory, allowing us to provide more cost-effective solutions.
3. Comprehensive OEM & ODM Services
With our robust production and management capabilities, we offer exceptional OEM and ODM services tailored to your needs.
4. Personalized Customization
We welcome non-standard, export, and custom orders for voltage, power, pressure, etc. Contact us to discuss your specific requirements.
5. Small Order Acceptance
Place a small trial order to experience the superior quality of our products firsthand.
6. Rapid Delivery
Benefit from our high-quality products paired with timely and efficient delivery services.
7. Full Authorization
For our distributors, we provide comprehensive authorization certificates, empowering you to market our SANZHI brand products with confidence.
Successful Cases
Sanzhi (Henan) Compressor Co., Ltd is a seasoned manufacturer specializing in screw air compressors and screw vacuum pumps, boasting over a decade of industry expertise. Our extensive product portfolio encompasses 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.
In our production processes, we achieve unparalleled efficiency through our lean, modern multi-air compressor assembly lines. With the dedication of over 50 skilled employees, we continually optimize management systems such as ERP to reduce lead times, ensuring the swift delivery of top-quality products.
Regarding management, our factory is certified by the ISO9001 quality management system. We rigorously enforce high-quality management standards, following stringent quality control protocols. Each machine undergoes thorough material inspections, production assessments, and pre-delivery checks before leaving our facility.
In customer service, our pre-sales team offers expert guidance in selecting the ideal air equipment for diverse facilities, providing extensive customization options including appearance and configuration. We also excel in creating unique OEM products to meet specific dealer demands. Our after-sales team, composed of experienced sales and service professionals, ensures rapid responses to customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we commit to delivering superior and stable products, fostering long-term customer relationships. With our efficient delivery, high-quality machines, and competitive prices, we reliably offer you outstanding compressed air solutions.
Our factory is conveniently situated 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 tailor a solution 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, our lead time is 15 working days post-confirmation. For non-standard voltage requirements, kindly reach out to our sales team for precise timelines.
Q7. What's the payment term?
A: We require a payment structure of 30% T/T in advance, 40% T/T before shipment, and the remaining 30% T/T upon receipt of the B/L copy. We accept both USD and RMB as payment currencies.
Q8. How about your warranty?
A: Our warranty covers one year for the entire machine and two years for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The first maintenance should be conducted after 500 operating hours. Subsequent maintenance is required every 2000-3000 hours, depending on the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are designed to operate efficiently in high-temperature environments, with a 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, backed by our professional design team, making us highly adaptable to your unique needs.
Q12. How long could your air compressor be used?
A: Our air compressors have a robust lifespan, typically exceeding 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we will definitely provide spare parts for the machines.
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 engineers to provide training and installation support.
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