Internal Structure Frontside
Internal Structure Backside
Working Principle
In the ideal scenario of air compression, the energy required for single-stage pressure transmission equates to the cumulative energy needed for multi-stage compression. In reality, due to factors such as coupling transmission losses, bearing friction, and the viscosity's cooling effect, the actual operational power increases. By minimizing the compression ratio at each stage, we can lower the overall power consumption in multi-stage compression, making it more efficient than single-stage compression.
The two-stage screw air compressor features a dual-stage rotary screw system, with each stage comprising an active and a passive screw. The active screw propels the passive screw using an external power mechanism. The initial stage employs a low-pressure rate screw group, while the second stage utilizes a high-pressure rate screw group. Encircling each screw is a sealing air film. During rotation, air undergoes three core processes: suction, pressurization, and exhaust.
First Stage Compression: The initial stage of the two-stage screw air compressor employs a low-pressure rate screw group, compressing the gas between them. The gas is drawn into the compression chamber via the suction valve. With the high-speed rotation of the screw rotor, the gas is gradually compressed and transferred to the subsequent stage.
Second Stage Compression: In this stage, the gas enters a more confined screw space, experiencing higher temperatures and pressures. The exhaust valve then opens to expel the high-pressure gases from the system.
Natural air is drawn into the first compression stage through an air filter, where it mixes with a small amount of lubricating oil. This mixture is compressed to an interstage pressure. The compressed gas then passes through a cooling channel, where it encounters significant oil mist, substantially reducing its temperature. This cooled gas enters the second-stage rotor for further compression, reaching the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, completing the entire compression cycle.
| 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. |
1) Unparalleled Efficiency of PM Motor:The constant torque and weak magnetic ranges are significantly wider, offering 20-30% higher efficiency compared to conventional motors. Even away from the rated frequency, the permanent magnet motor maintains its outstanding efficiency, ensuring exceptional performance at all times.
2) Maintenance-Free Motor:Our permanent magnet motor is designed without bearings, eliminating the need for costly bearing maintenance and replacement.
3) Advanced Integrated Frequency Converter:Featuring China's top frequency system, this unit offers extensive speed regulation and high precision. It adapts to the actual gas demand with remarkable energy-saving results.
4) Zero Transmission Loss:The permanent magnet motor and compressor utilize a compact, integrated shaft connection. This direct drive structure eliminates couplings and other transmission components, ensuring 100% transmission efficiency.
5) Variable and Soft Start MechanismsThe variable frequency start and soft start functionalities minimize impact on power grid equipment, preventing damage to electrical components.
6) Enhanced Energy Conservation:With a frequency conversion range from 25% to 100% (compared to the ordinary 50%-100%), this unit delivers over 30% energy savings against fixed-speed compressors. For systems with fluctuating gas consumption, the energy-saving impact is even more pronounced.
7) Unique Two-Stage Compression Air End:Our two-stage compression screw design combines both first and second-stage rotors within a single casing. Gears drive each stage to achieve optimal linear speeds, enhancing overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Employing a high-energy saving internal spray curtain cooling method, it significantly lowers compressed air temperature, achieving nearly isothermal compression. This method reduces pressure loss and enhances compression efficiency.
9) Minimized Internal Leakage:By adopting two-stage compression, we lower the compression ratio for each stage, reducing internal leakage and improving volumetric efficiency.
10) Superior Noise Reduction:Two-stage compression not only reduces the compression ratio but also significantly cuts down noise levels, particularly during unloading.
11) Effortless Maintenance and Service:Apart from the screw air end, the two-stage compressor's systems and structures are similar to single-stage compression units, ensuring convenience in maintenance and usage for users.
1. Unbeatable Price Advantage
We offer customers competitive ex-factory prices directly, ensuring you stay ahead of the market.
2. Direct Transactions
All our products are supplied straight from the factory, enabling us to offer you more cost-effective options.
3. Comprehensive OEM & ODM Services
With our robust production and management capabilities, we can cater to your OEM/ODM service needs seamlessly.
4. Tailored Customization
We welcome non-standard, export, voltage/power/pressure custom orders. Contact us to discuss your specific requirements and we will fulfill your demands.
5. Small Order Acceptance
Start with a small trial order to evaluate the premium quality of our products.
6. Rapid Delivery
We promise timely delivery of our high-quality products, ensuring your operations run smoothly.
7. Comprehensive Authorization
For distributors, we provide full authorization certification, empowering you to sell our prestigious SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd. is a renowned manufacturer specializing in the production of screw air compressors and screw vacuum pumps, boasting over a decade of industry expertise. Our extensive product portfolio includes normal pressure and 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 and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and screw vacuum pumps, among others.
In our state-of-the-art production facility, we achieve unparalleled efficiency through our advanced, lean multi-air compressor assembly lines. Supported by a dedicated team of over 50 employees, we continuously enhance our management systems, including ERP, to reduce lead times and ensure the rapid delivery of high-quality products.
In our commitment to quality management, our factory has earned ISO9001 certification. We rigorously adhere to stringent quality management protocols, ensuring each machine undergoes thorough inspections, including material checks, production evaluations, and pre-delivery assessments.
Our superior customer service extends from pre-sales to after-sales. Before purchase, we provide expert guidance in selecting the ideal air equipment and offer high levels of customization, including unique OEM products designed to meet specific dealer requirements. Post-purchase, our professional sales and service team is always ready to respond swiftly to customer needs.
At Sanzhi (Henan) Compressor Co., Ltd., we are dedicated to delivering superior, reliable products and fostering long-term customer relationships. With our commitment to efficient delivery, exceptional quality, and competitive pricing, we are your trusted partner for optimal compressed air solutions.
Our factory is conveniently located in Xinzheng City, Henan Province, China. We offer complimentary transportation from Xinzheng International Airport to our facility, just 30 kilometers away, approximately a one-hour journey. We look forward to welcoming you to our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors, with over 10 years of industry experience.
Q2. How do you control quality?
A: 1. We conduct stringent inspections of all raw materials.
2. We maintain strict control over 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. Desired air delivery capacity (Unit: CFM or m³/Min)
2. Required working pressure (Unit: PSI, Bar or Mpa)
3. Voltage and frequency in your country (V/Hz)
4. Additional accessories needed, such as air tanks, filters, or air dryers.
Provide us with this information, 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 are the available voltage options for air compressors?
A: Sanzhi air compressors are available in 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p, with further customization options available to meet your specific needs.
Q6. How long is the delivery time?
A: For standard voltage, our delivery time is a swift 15 working days post-confirmation of your order. For non-standard requirements, kindly reach out to our dedicated sales team for assistance.
Q7. What's the payment term?
A: We accept 30% T/T in advance, 40% T/T before shipment, and the final 30% T/T upon receipt of the B/L copy. Payments can be made in USD or RMB.
Q8. How about your warranty?
A: We offer a comprehensive one-year warranty for the entire machine and an extended two-year warranty for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The first maintenance should be conducted after 500 hours of operation. Subsequently, regular maintenance should be performed every 2000-3000 hours, considering the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are engineered 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. With our expert design team, customized orders are highly welcomed.
Q12. How long could your air compressor be used?
A: Our air compressors are built for durability and can generally be used for more than 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we provide spare parts to ensure the seamless operation of your machines.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online installation and commissioning instructions, and can arrange for our skilled engineers to assist with training and installation.
Audited Supplier 
){kind=link}
){kind=link}