Discover the pinnacle of industrial performance with the Large Power Oil-Lubricated Screw-Compressor from China's foremost supplier - Sanzhi (Henan) Compressor Co., Ltd. This extraordinary Permanent Magnet Variable Frequency Two-Stage Screw Air Compressor is a testament to engineering excellence, offering unparalleled energy savings and superior efficiency at factory-direct pricing. Outfitted with state-of-the-art, 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 a perfect world of air compression, the power necessary for single-stage pressure transmission equals the cumulative power required for multi-stage compression. However, reality introduces complexities like coupling transmission power loss, bearing friction, and the cooling effects of liquid viscosity, which increase the actual working power. To maximize efficiency and reduce power wastage, decreasing the compression ratio at each stage ensures that the total power needed for multi-stage compression is less than that for single-stage compression.
The two-stage screw air compressor boasts an innovative dual-stage rotary screw mechanism, each equipped with an active and a passive screw. The active screw, driven by an external transmission device, propels the passive screw. The first stage features a low-pressure rate screw group, while the second stage comprises a high-pressure rate screw group. Each screw is enveloped by a sealing air film, facilitating gas compression through the stages of suction, pressurization, and exhaust as they rotate.
First Stage Compression: Leveraging a low-pressure rate screw group, the gas undergoes initial compression. It enters the screw compression chamber via the suction valve, where the high-speed rotation of the screw rotor compresses the gas further, preparing it for transfer to the second stage.
Second Stage Compression: Within this stage, the gas is channeled into a tighter screw space where it experiences higher temperature and pressure. The exhaust valve subsequently opens, allowing the release of the high-pressure gases from the system.
Natural air is initially drawn into the first stage through an air filter, merging with a small amount of lubricating oil within the compression chamber. The gas is compressed to interstage pressure and then cooled in the cooling channel as it encounters oil mist. This cooling substantially reduces the gas temperature before it proceeds to the second-stage rotor for further compression to the final exhaust pressure. The entire compression process culminates 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 unparalleled power with our High Volume Centrifugal Fan Two-Stage Air Compressor. This marvel of engineering utilizes a high-speed rotating impeller to expertly accelerate and decelerate air. Air enters axially, allowing for rapid motor cooling far superior to conventional air-cooled fans. This ensures uninterrupted compressor operation and significantly prolongs the service life of the entire unit.
1) High Efficiency of PM Motor:Our state-of-the-art permanent magnet motor boasts a wider constant torque range and a weak magnetic range, delivering 20-30% higher efficiency compared to standard motors. It maintains exceptional efficiency, even when operating outside the rated frequency.
2) Maintenance-Free Motor:The permanent magnet motor features a bearing-free design, eliminating the costs and downtime associated with motor bearing maintenance and replacement.
3) Integrated Frequency Converter: Our compressor is equipped with China's premier frequency system, offering a broad speed regulation range and high precision. It adapts seamlessly to the user's actual gas demand, providing outstanding energy-saving performance.
4) No Transmission Loss: The direct connection between the permanent magnet motor and compressor through an embedded integrated shaft ensures a compact design. This coupling-free setup guarantees 100% transmission efficiency.
5) Variable Frequency Start and Soft Startoffer significant reduction in the impact on power grid equipment and prevent potential damage to electrical systems.
6) Energy Consumption Reduction: Our frequency conversion ranges from 25% to 100% (unlike ordinary conversions from 50% to 100%), leading to energy savings of over 30% compared to fixed-speed compressors. Compared to standard variable frequency compressors, the energy savings are approximately 5%. The more significant the fluctuation in system gas consumption, the more noticeable the energy-saving effect.
7) Unique Two-Stage Compression Air End:Our innovative two-stage compression screw machine features a uniquely designed air end, combining first-stage and second-stage compression rotors within a single case. Driven directly by gears, each rotor achieves optimal linear speed, ensuring higher compression efficiency.
8) Internal Spray Curtain Cooling Method: Our advanced internal spray curtain cooling method ensures excellent cooling effects, significantly reducing the temperature of compressed air. This approach achieves near-isothermal compression, lowers pressure loss between stages, reduces the compression ratio, and enhances overall compression efficiency.
9) Reduced Internal Leakage:The two-stage compression approach lowers the compression ratio for each stage, minimizing internal leakage from high-pressure to low-pressure ends and boosting volume efficiency.
10) Noise Reduction:The two-stage compression feature lowers the compression ratio, significantly reducing noise levels, especially unloading noise.
11) Easy Maintenance and Service:Our two-stage compressor unit maintains the same system and structure as single-stage compressors, apart from the screw air end. This design ensures straightforward and convenient maintenance and user servicing.
1. Unbeatable Price Advantage
We offer direct ex-factory prices, ensuring our customers maintain a significant competitive edge in their respective markets.
2. Direct Factory Transactions
Our products are shipped directly from the factory, enabling us to deliver the most cost-effective solutions to our clients.
3. Extensive OEM & ODM Services
Leveraging our extensive production and management capabilities, we provide outstanding OEM and ODM services specifically tailored to your unique needs.
4. Customized Personalization
We embrace non-standard, export, and custom orders for voltage, power, pressure, and more. Contact us to discuss your particular requirements.
5. Acceptance of Small Orders
Place a small trial order and experience the exceptional quality of our products firsthand.
6. Swift Delivery
Enjoy our premium-quality products complemented by our prompt and efficient delivery services.
7. Complete Authorization
For our distributors, we provide comprehensive authorization certificates, empowering you to market our SANZHI brand products with absolute confidence.
Sanzhi (Henan) Compressor Co., Ltd is a distinguished manufacturer with over a decade of expertise in screw air compressors and vacuum pumps. Our diversified product line includes normal pressure and 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.
Our production processes are marked by unmatched efficiency, thanks to our lean, state-of-the-art multi-air compressor assembly lines. With a workforce of over 50 skilled employees, we continually refine our management systems, including ERP, to minimize lead times and ensure the rapid delivery of premium-quality products.
Our factory's management adheres to the highest standards, certified by the ISO9001 quality management system. We enforce rigorous quality control protocols, conducting comprehensive material inspections, production assessments, and pre-delivery checks to guarantee that every machine meets our stringent standards.
Our pre-sales team provides expert guidance in selecting the ideal air equipment, offering extensive customization options in both appearance and configuration. We excel in creating tailored OEM products for specific dealer requirements. Our after-sales team, comprising experienced sales and service professionals, ensures prompt responses to customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior, reliable products and fostering long-term relationships with our clients. Through efficient delivery, high-quality machines, and competitive pricing, we consistently provide outstanding compressed air solutions.
Our factory is conveniently located in Xinzheng City, Henan Province, China. We offer complimentary transportation from Xinzheng International Airport to our factory, a brief 30-kilometer journey that takes approximately one hour. We warmly invite you to visit us!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a specialized manufacturer of screw air compressors with more than 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 configurations, our lead time is 15 working days from order confirmation. For custom or non-standard voltage requirements, please contact our sales team for specific timelines.
Q7. What's the payment term?
A: We adhere to the following payment structure: 30% T/T in advance, 40% T/T prior to shipment, and the remaining 30% T/T upon receipt of the B/L copy. We accept payments in both USD and RMB.
Q8. How about your warranty?
A: Our comprehensive warranty includes one year for the entire machine and two years for the screw air compressor, excluding consumable parts.
Q9. What about the maintenance?
A: The initial maintenance should be performed after 500 operating hours. Thereafter, maintenance is required every 2000-3000 hours, contingent upon the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are engineered to perform efficiently in high-temperature conditions, with an operational range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we offer comprehensive OEM and ODM services, supported by our professional design team, ensuring we meet your unique requirements.
Q12. How long could your air compressor be used?
A: Our air compressors boast a robust lifespan, typically exceeding 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we do provide essential spare parts for our machines to ensure seamless operation.
Q14. How about your after-sales service?
A: We provide extensive after-sales support, including online guidance for installation and commissioning. We can also arrange for our engineers to offer on-site training and installation assistance.
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