Unleash unparalleled performance with the Large Power Oil Lubricated Screw-Compressor from Sanzhi (Henan) Compressor Co., Ltd. As a leading China supplier, we offer Factory Price Permanent Magnet Variable Frequency Two-Stage Screw Air Compressors integrated with premium quality Industrial Centrifugal Fans. Expect nothing less than Energy Saving, High Efficiency, and a Stationary Type design that meets all your industrial needs.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power necessary for single-stage pressure transmission equals the combined power needed for multi-stage compression. However, in real-world scenarios, actual working power increases due to factors such as coupling transmission power loss, bearing friction coefficient, and the cooling effect of liquid viscosity. To mitigate this, reducing the compression ratio at each stage can decrease the total power required for multi-stage compression, making it more efficient than single-stage compression.
The two-stage screw air compressor comprises a two-stage rotary screw mechanism, each stage featuring an active and a passive screw. The active screw powers 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 surrounded by a sealing air film. As the screws rotate, gas undergoes compression through three phases: suction, pressurization, and exhaust.
First Stage Compression: The initial stage of the two-stage screw air compressor employs a low-pressure rate screw group. Gas is drawn into the screw compression chamber through the suction valve, where it is progressively compressed by the high-speed rotation of the screw rotor, and then transferred to the second stage.
Second Stage Compression: In the second stage, the gas enters a more confined screw space, where it is subjected to higher temperatures and pressures. The exhaust valve then opens, expelling the high-pressure gases from the system.
Natural air is first drawn into the compressor through the air filter and mixed with a small amount of lubricating oil in the compression chamber. This mixture is compressed to interstage pressure. The compressed gas is then cooled in the cooling channel, where it contacts a large amount of oil mist, significantly reducing its temperature. The cooled, compressed gas enters the second-stage rotor for further compression to the final exhaust pressure. The entire process concludes 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 boasts an advanced high-speed rotating impeller designed to accelerate and decelerate air flow efficiently. With axial air intake, it enhances motor cooling more effectively than conventional air-cooled fans. This innovative design ensures continuous compressor operation and significantly extends its service life.
1) High Efficiency of PM Motor: The permanent magnet (PM) motor excels with a broader constant torque range and weak magnetic range. It achieves 20-30% higher efficiency compared to standard motors. Remarkably, the PM motor maintains its superior efficiency even when operating away from its rated frequency, ensuring consistent high performance.
2) Maintenance-Free Motor:The PM motor is designed without internal bearings, eliminating the need for costly bearing maintenance and replacement.
3) Integrated Frequency Converter:Employing China's premier frequency system, this unit offers extensive speed regulation with high precision. It adjusts operation based on real-time gas demands, delivering exceptional energy-saving performance.
4) Zero Transmission Loss:The PM motor and compressor feature a direct integrated shaft connection, resulting in a more compact structure. By eliminating couplings and other transmission parts, it ensures 100% transmission efficiency.
5) Variable Frequency and Soft Start:This feature minimizes impact on power grid equipment, protecting electrical systems from potential damage.
6) Reduced Energy Consumption:With a frequency conversion range of 25% to 100% (compared to the standard 50% to 100%), this compressor saves over 30% energy compared to fixed-speed models, and roughly 5% more than typical variable frequency compressors. The greater the system's gas consumption fluctuation, the more significant the energy savings.
7) Unique Two-Stage Compression Air End:This innovative design integrates first and second stage compression rotors within a single case, driven by gears for optimal speed. This enhances compression efficiency significantly.
8) Internal Spray Curtain Cooling Method:Our high-efficiency internal spray curtain cooling dramatically lowers compressed air temperatures. Achieving near-isothermal compression, it reduces pressure loss and compression ratios, boosting overall efficiency.
9) Minimized Internal Leakage:The two-stage compression reduces each stage's compression ratio, lessening the internal leakage from high to low pressure ends, and thereby improves volumetric efficiency.
10) Noise Reduction:The dual-stage compression design significantly lowers the compression ratio, leading to a substantial reduction in both operational and unloading noise levels.
11) Easy Maintenance and Service:The two-stage compressor unit shares similar structures and systems with single-stage units, aside from the screw air end, making maintenance and service straightforward and user-friendly.
1. Price Advantage
We provide customers with direct ex-factory prices, ensuring that our clients remain highly competitive in their markets.
2. Direct Deal
All our products come directly from the factory, allowing us to offer more cost-effective solutions.
3. OEM & ODM Services
With robust production and management capabilities, our factory is well-equipped to offer you top-tier OEM and ODM services.
4. Customized Service
We cater to non-standard and export orders, customizing voltage, power, pressure, and more according to your specific needs. Contact us to discuss your requirements.
5. Accept Small Orders
You can start with a small trial order to evaluate the superior quality of our products.
6. Fast Delivery
We ensure high-quality products are delivered to you promptly and efficiently.
7. Complete Authorization
For distributors, we provide full authorization certificates, enabling you to sell our SANZHI brand products with confidence.
Sanzhi (Henan) Compressor Co., Ltd, is a distinguished manufacturer specializing in screw air compressors and screw vacuum pumps, boasting over a decade of industry expertise. Our extensive product portfolio 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, screw vacuum pumps, and more.
Our production processes are highly efficient, utilizing lean and modern multi-air compressor assembly lines. Supported by a dedicated team of over 50 employees, we continuously optimize our management systems, such as ERP, to reduce lead times and ensure rapid delivery of top-quality products.
In terms of management, our factory has earned the ISO9001 quality management system certification. We strictly adhere to rigorous quality management protocols and standard quality control processes. Each machine undergoes thorough material inspection, production inspection, and pre-delivery inspection to ensure impeccable quality.
Our customer service is exceptional. During pre-sales, we provide expert guidance to help customers select the perfect air equipment for various facilities and offer highly customizable solutions, including unique OEM products to meet specific dealer demands. For after-sales, our professional sales and service team ensures a swift response to customer inquiries.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior and reliable products to foster long-term relationships with our customers. With efficient delivery, high-quality machines, and competitive pricing, we promise to provide you with a top-notch compressed air solution.
Our factory is situated 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 welcome you to visit our company!
Successful Cases
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.
Q2. How do you control quality?
A: 1. Raw materials undergo strict inspection.
2. Installation procedures are meticulously controlled.
3. Each machine must pass a minimum of 5 hours of continuous testing before leaving the factory.
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 offers multiple voltage options, including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p. We can also customize according to your specific requirements.
Q6. How long is the delivery time?
A: For standard voltage, expect a swift 15 working days after the confirmed order. For non-standard requirements, kindly contact our sales team for a personalized timeline.
Q7. What's the payment term?
A: 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. We accept both USD and RMB.
Q8. How about your warranty?
A: Enjoy peace of mind with our comprehensive warranty: one year for the entire machine and a generous 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 routine maintenance every 2000-3000 hours, adjusting as needed based 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 proudly offer OEM & ODM services, supported by our expert design team, to cater to your specific needs.
Q12. How long could your air compressor be used?
A: Our robust air compressors are built to last, providing reliable service for over 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we will provide the necessary spare parts to ensure your machine's optimal performance.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales service including online instructions for installation and commissioning, with our engineers available to assist with training and installation.
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