Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy needed for single-stage pressure transmission equals the cumulative energy required for multi-stage compression. However, real-world conditions introduce factors like coupling transmission losses, bearing friction, and the cooling effect of viscosity, which increase operational power. By reducing the compression ratio at each stage, multi-stage compression can significantly lower overall power consumption, making it more efficient than single-stage compression.
The two-stage screw air compressor utilizes a dual-stage rotary screw system, with each stage featuring an active and a passive screw. The active screw drives the passive screw via an external power mechanism. The initial stage uses a low-pressure rate screw group, while the second stage employs a high-pressure rate screw group. Each screw is surrounded by a sealing air film. As they rotate, 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 to compress gas. The gas is drawn into the compression chamber through the suction valve, and as the screw rotor rotates at high speed, the gas is gradually compressed and transferred to the next stage.
Second Stage Compression: In this stage, the gas enters a more confined screw space, encountering higher temperatures and pressures. The exhaust valve then opens, expelling the high-pressure gases from the system.
Natural air is drawn into the first compression stage through an air filter, mixing with a small amount of lubricating oil. This mixture is compressed to an interstage pressure, then passes through a cooling channel where it encounters significant oil mist, substantially reducing its temperature. The 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 meticulously designed permanent magnet motor is entirely without bearings, thus eliminating the need for costly bearing maintenance and replacement, ensuring seamless operation.
3) Advanced Integrated Frequency Converter:Featuring China's top-tier frequency system, this unit offers unparalleled speed regulation and precision. It adeptly adapts to actual gas demand, delivering 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, thereby preventing damage to electrical components and ensuring longevity.
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 innovative two-stage compression screw design integrates both first and second-stage rotors within a single casing. Gears drive each stage to achieve optimal linear speeds, markedly 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 effectively lower the compression ratio for each stage, thereby reducing internal leakage and enhancing 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, creating a quieter work environment.
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 deliver our products at highly competitive ex-factory prices, ensuring you are always one step ahead in the market.
2. Direct Transactions
As our products come directly from the factory, we provide you with cost-effective solutions that maximize your value.
3. Comprehensive OEM & ODM Services
Leveraging our robust production and management capabilities, we seamlessly accommodate all your OEM/ODM service needs.
4. Tailored Customization
We specialize in non-standard, export, voltage/power/pressure custom orders. Contact us to discuss your unique requirements, and we will exceed your expectations.
5. Small Order Acceptance
Begin with a small trial order to experience the superior quality of our products firsthand.
6. Rapid Delivery
We ensure timely delivery of our premium products, guaranteeing the smooth operation of your business.
7. Comprehensive Authorization
For distributors, we offer full authorization certification, empowering you to successfully market and sell our esteemed SANZHI brand products.
Successful Cases
Sanzhi (Henan) Compressor Co., Ltd. stands as a distinguished manufacturer with over a decade of expertise in producing screw air compressors and vacuum pumps. Our comprehensive range includes normal and low-pressure screw air compressors, permanent magnet frequency conversion models, two-stage compression units, laser cutting air compressors, single and double-tank mobile compressors, electric and diesel mobile units, as well as screw vacuum pumps, among others.
In our cutting-edge production facility, we achieve unparalleled efficiency with our advanced, lean multi-air compressor assembly lines. Supported by a dedicated team of over 50 employees, we continuously enhance our management systems, such as ERP, to reduce lead times and ensure the rapid delivery of high-quality products.
Committed to quality management, our factory has earned ISO9001 certification. We rigorously adhere to stringent quality 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 tailored to 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 commit to delivering superior, reliable products and fostering long-term customer relationships. With our dedication to efficient delivery, exceptional quality, and competitive pricing, we are your trusted partner for optimal compressed air solutions.
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 a decade 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 requirements, our delivery time is impressively swift, at just 15 working days post-order confirmation. For non-standard specifications, please reach out to our devoted sales team for tailored assistance.
Q7. What's the payment term?
A: We accept a structured payment plan: 30% T/T in advance, 40% T/T before shipment, and the final 30% T/T upon receipt of the B/L copy. Payments are welcome in both USD or RMB.
Q8. How about your warranty?
A: We provide a comprehensive one-year warranty covering the entire machine. Additionally, we offer an extended two-year warranty for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should occur after the first 500 hours of operation. Thereafter, regular maintenance is recommended every 2000-3000 hours, adjusted based on the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are meticulously engineered to operate efficiently in high-temperature environments, with an operational temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we proudly provide both OEM & ODM services. With our expert design team, customized orders are highly welcomed and accommodated.
Q12. How long could your air compressor be used?
A: Our air compressors are built for remarkable durability, typically ensuring more than 10 years of reliable service.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we supply essential spare parts to guarantee the uninterrupted performance of your machines.
Q14. How about your after-sales service?
A: We deliver extensive after-sales support, including online installation and commissioning guidance. Additionally, we can arrange for our skilled engineers to assist with training and on-site installation.
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