Unleash unparalleled performance with the Large Power Oil-Lubricated Screw Compressor from Sanzhi (Henan) Compressor Co., Ltd.! As a distinguished leader in the Chinese market, we proudly offer Factory Price Permanent Magnet Variable Frequency Two-Stage Screw Air Compressors, meticulously integrated with top-tier Industrial Centrifugal Fans. Expect nothing short of excellence with our energy-saving and high-efficiency solutions, crafted in a robust stationary type design to seamlessly meet all your industrial requirements. Our compressors promise remarkable reliability, superior functionality, and unmatched durability, ensuring your operations run smoothly and efficiently. Choose Sanzhi for innovation, quality, and unparalleled industrial air compression solutions.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission is comparable to the combined power needed for multi-stage compression. However, in practical applications, actual working power increases due to coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity. To mitigate these effects, reducing the compression ratio at each stage can significantly decrease the total power needed for multi-stage compression, making it more efficient than single-stage compression.
The two-stage screw air compressor is engineered with a sophisticated two-stage rotary screw mechanism, featuring an active and a passive screw in each stage. The active screw drives the passive screw via 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 systematically compressed through three phases: suction, pressurization, and exhaust.
First Stage Compression: During the initial phase, the two-stage screw air compressor uses a low-pressure rate screw group. Gas is drawn into the screw compression chamber via the suction valve, where it is incrementally compressed by the high-speed rotation of the screw rotor before being transferred to the second stage.
Second Stage Compression: In the second phase, the gas enters a more confined screw space and is subjected to higher temperatures and pressures. The exhaust valve then opens, releasing the high-pressure gases from the system.
Natural air is initially drawn into the compressor through an air filter and mixed with a small quantity of lubricating oil in the compression chamber. This mixture is compressed to interstage pressure. The compressed gas flows through the cooling channel, encountering significant oil mist, which drastically reduces its temperature. The cooled, compressed gas then enters the second-stage rotor for further compression to the final exhaust pressure. The process culminates with the gas being 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. |
The centrifugal fan features an advanced high-speed rotating impeller meticulously engineered for optimal airflow acceleration and deceleration. Together with axial air intake, it markedly enhances motor cooling over traditional air-cooled fans. This revolutionary design ensures seamless compressor operation and significantly extends its lifespan.
1) Superior Efficiency of *** Motor:The permanent magnet (***) motor is celebrated for its extensive constant torque and weak magnetic range, offering 20-30% higher efficiency than conventional motors. Remarkably, even at frequencies beyond its rating, the *** motor maintains its exceptional efficiency, ensuring stellar, consistent performance.
2) Maintenance-Free Motor Design:Engineered to operate without internal bearings, the *** motor eliminates the need for costly bearing maintenance and replacement, ensuring impeccable and uninterrupted performance.
3) Advanced Integrated Frequency Converter:Utilizing China's leading frequency system, this unit offers precise and broad speed regulation. It dynamically adjusts its functioning based on real-time gas demands, delivering outstanding energy-efficient performance.
4) Zero Transmission Loss Achieved:The *** motor and compressor boast a direct integrated shaft connection, creating a more compact design. By removing couplings and other transmission components, it ensures 100% transmission efficiency.
5) Variable Frequency & Soft Start Feature:This feature significantly reduces the impact on power grid equipment, safeguarding electrical systems from potential damage.
6) Dramatically Reduced Energy Consumption:With a frequency conversion range of 25% to 100% (versus the standard 50% to 100%), this compressor achieves over 30% energy savings compared to fixed-speed models and approximately 5% more than typical variable frequency compressors. Greater fluctuations in system gas consumption lead to even more substantial energy savings.
7) Unique Two-Stage Compression Air End Design:This innovative design integrates first and second stage compression rotors in a single case, driven by gears for optimal speed, significantly enhancing compression efficiency.
8) Highly Efficient Internal Spray Curtain Cooling:Our advanced internal spray curtain cooling significantly lowers compressed air temperatures. Achieving nearly isothermal compression, it minimizes pressure loss and compression ratios, greatly enhancing overall efficiency.
9) Minimized Internal Leakage for Efficiency:The two-stage compression technique lowers the compression ratio at each stage, reducing internal leakage from high to low pressure ends, thereby improving volumetric efficiency.
10) Significant Noise Reduction:The dual-stage compression design significantly lowers the compression ratio, resulting in a considerable reduction in both operational and unloading noise levels.
11) Effortless Maintenance and Service:Apart from the screw air end, the two-stage compressor unit shares similar structures and systems with single-stage units, making maintenance and service straightforward and user-friendly.
1. Unbeatable Price Advantage
We offer direct ex-factory prices, ensuring that our clients remain highly competitive in their markets. Benefit from maximum profitability and enhanced market share with our cost-efficient pricing model.
2. Seamless Direct Deal
Our products come straight from the factory to you, providing more cost-effective solutions by eliminating intermediary markups. Experience the benefits of a seamless direct deal.
3. Premium OEM & ODM Services
With advanced production and management capabilities, we offer superior OEM and ODM services. These are crafted to meet your exact specifications and business needs, ensuring the best fit for your market.
4. Tailored Customization Services
We excel in non-standard and export orders, customizing voltage, power, pressure, and more. Discuss your specific requirements with us to obtain personalized solutions that perfectly match your needs.
5. Small Order Flexibility
Initiate with a small trial order to evaluate the exceptional quality of our products. Witness the remarkable difference firsthand and build confidence in our offerings.
6. Rapid and Reliable Delivery
We guarantee swift and efficient delivery of our high-quality products, ensuring that your operations proceed without delay. Trust in our reliable logistics.
7. Comprehensive Authorization
For our distributors, we provide complete authorization certificates. This empowers you to sell SANZHI brand products with full confidence and comprehensive support from us.
Sanzhi (Henan) Compressor Co., Ltd. proudly stands as a prestigious leader in the world of screw air compressors and screw vacuum pumps. Boasting over a decade of rich industry expertise, we present an expansive and diverse product portfolio. Our offerings include normal pressure/low-pressure screw air compressors, cutting-edge permanent magnet frequency conversion screw air compressors, advanced two-stage compression screw air compressors, specialized screw air compressors designed for laser cutting, and versatile single-tank and double-tank mobile screw air compressors. Additionally, we provide electric and diesel mobile screw air compressors, along with high-performance screw vacuum pumps, ensuring we cater to all your needs.
Our state-of-the-art production operations epitomize efficiency and modernity, utilizing lean, multi-air compressor assembly lines. Supported by a dedicated workforce of over 50 professionals, we continually refine our management systems, including ERP, to reduce lead times and guarantee the swift delivery of top-tier products. Our commitment to operational excellence ensures that we remain at the forefront of the industry.
Our unwavering commitment to excellence is validated by our ISO9001 quality management system certification. By adhering to the most stringent quality management protocols and standardized control processes, we ensure that every machine undergoes rigorous material, production, and pre-delivery inspections. This guarantees that our products meet the highest standards of impeccable quality.
We take immense pride in delivering exceptional customer service. During the pre-sales phase, we offer expert guidance to help clients choose the ideal air equipment, complemented by highly customized solutions, including unique OEM products tailored to specific dealer requirements. Post-sales, our professional sales and service team ensures prompt and effective responses to customer inquiries, maintaining an unwavering commitment to customer satisfaction.
At Sanzhi (Henan) Compressor Co., Ltd., our mission is to deliver superior and reliable products, fostering enduring relationships with our valued clientele. With efficient delivery, machines of unmatched quality, and competitive pricing, we are dedicated to providing unparalleled compressed air solutions that exceed expectations.
Our factory is strategically located in Xinzheng City, Henan Province, China. We offer convenient pick-up services from Xinzheng International Airport to our factory, located approximately 30 kilometers away-a journey of about one hour. We warmly invite you to visit our company and witness our operations firsthand, where you will experience our dedication to quality and excellence.
Frequently Asked Questions (FAQ)
Q1. Are you a trading company or manufacturer?
A: We are a specialized manufacturer of screw air compressors with over a decade of professional expertise.
Q2. How do you control quality?
A: 1. Meticulous inspection of all raw materials.
2. Stringent control over every installation procedure.
3. Each compressor undergoes a minimum of 5 hours of rigorous 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 tailored to your needs!
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 comprehensive 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 initial 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 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 provide both OEM and ODM services, supported by our professional design team, allowing us to adapt to 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 will certainly provide spare parts for all our machines.
Q14. How about your after-sales service?
A: We offer an unparalleled after-sales service experience, providing comprehensive online guidance for both installation and commissioning. Furthermore, we can schedule our highly skilled engineers to deliver in-person training and hands-on installation support, ensuring your operations run smoothly and efficiently.
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