Unleash unparalleled performance and efficiency with the robust Large Power Oil Lubricated Screw Compressor from Sanzhi (Henan) Compressor Co., Ltd. As an industry-leading supplier in China, we proudly present our Factory Price Permanent Magnet Variable Frequency Two-Stage Screw Air Compressors. These exceptional machines are seamlessly integrated with premium quality Industrial Centrifugal Fans, offering an unbeatable combination of Energy Saving and High Efficiency. Designed with a Stationary Type build, our compressors are tailor-made to meet all your industrial needs with unmatched precision and reliability.
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 combined power needed for multi-stage compression. However, real-world conditions introduce factors such as coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity, which increase actual working power. To counteract these inefficiencies, reducing the compression ratio at each stage can significantly lower the total power requirement for multi-stage compression, making it more efficient than single-stage compression.
The two-stage screw air compressor features a dual rotary screw mechanism, with each stage comprising an active and a passive screw. The passive screw is driven by the active screw through an external transmission device. The first stage employs a low-pressure rate screw group, while the second stage utilizes a high-pressure rate screw group. Each screw is enveloped by a sealing air film. As the screws rotate, gas is compressed through three distinct phases: suction, pressurization, and exhaust.
First Stage Compression: In the initial stage of the two-stage screw air compressor, a low-pressure rate screw group draws gas into the screw compression chamber via the suction valve. The high-speed rotation of the screw rotor progressively compresses the gas, which is then transferred to the second stage for further compression.
Second Stage Compression: At this stage, the gas enters a more confined screw space, where it is subjected to elevated temperatures and pressures. The exhaust valve then opens to expel the high-pressure gases from the system.
The process begins with natural air being drawn into the compressor through an air filter and mixed with a small amount of lubricating oil in the compression chamber. This mixture is compressed to interstage pressure and then cooled in the cooling channel, where it contacts a large amount of oil mist, significantly reducing its temperature. The cooled, compressed gas proceeds to the second-stage rotor for further compression to the final exhaust pressure. The entire process concludes with the gas being expelled 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. |
The centrifugal fan features an advanced high-speed rotating impeller meticulously designed to manage air flow with precision. Utilizing axial air intake, it provides superior motor cooling, far surpassing traditional air-cooled fans. This cutting-edge technology guarantees uninterrupted compressor operation, thereby significantly extending its lifespan.
1) High Efficiency of *** Motor:The permanent magnet (***) motor showcases an exceptional torque range and a broad weak magnetic range. It delivers an impressive 20-30% increase in efficiency compared to conventional motors. Even when operating outside its rated frequency, the *** motor maintains outstanding efficiency, ensuring consistent high-level performance.
2) Maintenance-Free Motor:The *** motor is ingeniously designed without internal bearings, completely eliminating the need for expensive bearing maintenance and replacements.
3) Integrated Frequency Converter:Utilizing China's leading frequency system, this unit offers a wide range of speed regulation with remarkable precision. It adapts to real-time gas demands, achieving unparalleled energy savings.
4) Zero Transmission Loss:The direct integrated shaft connection between the *** motor and compressor results in a more streamlined structure. By removing couplings and other transmission components, it guarantees 100% transmission efficiency.
5) Variable Frequency and Soft Start:This feature significantly reduces the impact on power grid equipment, safeguarding electrical systems from potential harm.
6) Reduced Energy Consumption:With an expansive frequency conversion range of 25% to 100% (compared to the standard 50% to 100%), this compressor achieves over 30% energy savings versus fixed-speed models, and approximately 5% more than standard variable frequency compressors. The greater the fluctuation in gas consumption, the more substantial the energy savings.
7) Unique Two-Stage Compression Air End:This revolutionary design incorporates both first and second stage compression rotors within a single casing, driven by gears for optimal performance. This significantly boosts compression efficiency.
8) Internal Spray Curtain Cooling Method:Our high-efficiency internal spray curtain cooling system markedly lowers compressed air temperatures. Achieving near-isothermal compression, it minimizes pressure loss and compression ratios, thereby enhancing overall efficiency.
9) Minimized Internal Leakage:The two-stage compression design decreases the compression ratio per stage, reducing internal leakage from high to low pressure ends and enhancing volumetric efficiency.
10) Noise Reduction:The dual-stage compression design notably reduces the compression ratio, leading to a significant decrease in both operational and unloading noise levels.
11) Easy Maintenance and Service:With shared structures and systems similar to single-stage units, aside from the screw air end, the two-stage compressor unit ensures maintenance and service are straightforward and user-friendly.
1. Unbeatable Price Advantage
We offer our customers direct ex-factory prices, ensuring you maintain a competitive edge in your market. Experience unparalleled cost savings with us.
2. Seamless Direct Deal
Our products come straight from the factory, allowing us to present you with more economical and efficient solutions, cutting out intermediaries for better value.
3. Premier OEM & ODM Services
Thanks to our strong production and management capabilities, our factory is perfectly poised to deliver first-class OEM and ODM services tailored to your specifications.
4. Tailored Customization Service
We handle non-standard and export orders, customizing voltage, power, pressure, and more to suit your exact requirements. Reach out to us to explore and discuss your needs.
5. Small Orders Welcomed
Begin with a small trial order to assess the exceptional quality of our offerings. We're confident you'll be impressed.
6. Swift and Reliable Delivery
We guarantee that our high-quality products will reach you quickly and efficiently, ensuring your operations continue without delay.
7. Comprehensive Authorization
For our distributors, we provide complete authorization certificates, empowering you to market and sell our SANZHI brand products with full confidence and legitimacy.
Sanzhi (Henan) Compressor Co., Ltd, is a renowned manufacturer specializing in screw air compressors and screw vacuum pumps. With over a decade of unparalleled industry expertise, we take pride in our extensive product portfolio that 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 compressors, electric mobile screw air compressors, diesel mobile screw air compressors, and cutting-edge screw vacuum pumps.
Our production processes epitomize efficiency, leveraging lean and state-of-the-art multi-air compressor assembly lines. Driven by a dedicated team of over 50 employees, we consistently optimize our management systems, including ERP, to minimize lead times and ensure the rapid delivery of premium-quality products.
In terms of management, our factory proudly holds the ISO9001 quality management system certification. We meticulously adhere to stringent quality management protocols and standardized quality control processes. Each machine undergoes comprehensive material inspection, meticulous production inspection, and rigorous pre-delivery inspection to guarantee impeccable quality.
Our customer service is second to none. During pre-sales, we provide expert guidance to help customers select the ideal air equipment for various facilities, offering highly customizable solutions, including bespoke OEM products tailored to meet specific dealer demands. For after-sales, our professional sales and service team ensures prompt responses to customer inquiries, delivering unparalleled service.
At Sanzhi (Henan) Compressor Co., Ltd, we are dedicated to delivering superior and dependable products, fostering long-term relationships with our valued customers. With our efficient delivery system, high-quality machines, and competitive pricing, we pledge to provide you with top-tier compressed air solutions.
Our factory, located in Xinzheng City, Henan Province, China, offers convenient pick-up services from Xinzheng International Airport, which is approximately 30 kilometers away-a journey of about one hour. We warmly welcome you to visit our company and experience our hospitality firsthand!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors with over 10 years of experience, dedicated to delivering high-quality and reliable products.
Q2. How do you control quality?
A: 1. We implement rigorous quality control measures, starting with the thorough inspection of all raw materials.
2. Our installation procedures are meticulously controlled to ensure precision and excellence at every step.
3. Each machine undergoes a minimum of 5 hours of continuous testing before leaving the factory, ensuring durability and performance.
Q3. What information must I provide to get the suitable machine?
1. Desired air delivery capacity (Unit: CFM or m³/Min)
2. Required working pressure (Unit: PSI, Bar, or Mpa)
3. Voltage and frequency specifications in your country (V/Hz)
4. Additional accessories needed, such as an air tank, filters, and/or air dryers.
Share this information with us, and we will recommend the best solution for you!
Q4. What is the general unit conversion?
1Bar = 0.1Mpa = 14.5PSI
1m³/min = 35.32cfm
1KW = 1.34HP
Q5. What are the available voltage options for air compressors?
A: Sanzhi provides a variety of voltage options to meet diverse requirements, including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p. Custom voltage options are also available upon request.
Q6. How long is the delivery time?
A: For standard voltage configurations, expect delivery within 15 working days post-order confirmation. For non-standard requirements, please contact our sales team for a tailored delivery schedule.
Q7. What's the payment term?
A: We offer a flexible payment structure: 30% T/T in advance, 40% T/T before shipment, and the remaining 30% T/T against the B/L copy. Payments can be made in both USD and RMB.
Q8. How about your warranty?
A: We provide a comprehensive warranty for your peace of mind: one year for the entire machine and two years for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: Initial maintenance is required after 500 hours of operation, followed by regular maintenance every 2000-3000 hours, with adjustments based on 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 environments, with a working temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we proudly offer OEM & ODM services. Our expert design team is ready to cater to your specific needs and customize solutions tailored for you.
Q12. How long could your air compressor be used?
A: Our robust air compressors are engineered for longevity, ensuring reliable performance for over 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we will provide all the essential spare parts to ensure your machine operates at peak performance and efficiency.
Q14. How about your after-sales service?
A: We offer a comprehensive after-sales service package, which includes detailed online instructions for installation and commissioning. Additionally, our skilled engineers are available to assist you with personalized training sessions and on-site installation support.
Audited Supplier 
){kind=link}
){kind=link}