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 is designed with a dual-stage rotary screw system, featuring active and passive screws at each stage. The active screw drives the passive screw through an external power mechanism. The first stage utilizes 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. During operation, air undergoes three critical processes: suction, pressurization, and exhaust.
First Stage Compression: In the initial stage of the two-stage screw air compressor, a low-pressure rate screw group compresses the gas between the screws. The gas is drawn into the compression chamber via the suction valve. As the screw rotor rotates at high speed, the gas is gradually compressed and transferred to the next stage.
Second Stage Compression: During this stage, the gas enters a more confined screw space, experiencing elevated temperatures and pressures. The exhaust valve then opens to release 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, encountering significant oil mist that substantially reduces its temperature. This cooled gas then enters the second-stage rotor for further compression, achieving the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, completing the 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:Experience unprecedented efficiency with our PM motor! Its wide-ranging constant torque and weak magnetic ranges deliver an impressive 20-30% higher efficiency than traditional motors. Even beyond the rated frequency, our permanent magnet motor maintains its superior efficiency, ensuring exceptional performance anytime, anywhere.
2) Maintenance-Free Motor:Say goodbye to costly bearing maintenance and replacements. Our innovative permanent magnet motor is designed without bearings, ensuring a truly maintenance-free experience.
3) Advanced Integrated Frequency Converter:Equipped with China's premier frequency system, our unit offers extensive speed regulation and unparalleled precision. It adapts seamlessly to actual gas demand, delivering remarkable energy-saving performance.
4) Zero Transmission Loss:Achieve 100% transmission efficiency with our compact, integrated shaft connection. The direct drive structure eliminates couplings and other transmission components, ensuring zero transmission loss.
5) Variable and Soft Start MechanismsProtect your power grid equipment with our variable frequency start and soft start functionalities. These features minimize impact and prevent damage to electrical components.
6) Enhanced Energy Conservation:Our unit's frequency conversion range of 25% to 100%, compared to the ordinary 50%-100%, results in over 30% energy savings compared to fixed-speed compressors. In systems with fluctuating gas consumption, the energy-saving impact is even more substantial.
7) Unique Two-Stage Compression Air End:Our innovative two-stage compression screw design integrates first and second-stage rotors within a single casing, with gears driving each stage to achieve optimal linear speeds, significantly enhancing overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Our high-energy saving internal spray curtain cooling method significantly reduces compressed air temperature, achieving nearly isothermal compression. This innovative approach reduces pressure loss and enhances compression efficiency.
9) Minimized Internal Leakage:By utilizing two-stage compression, we lower the compression ratio for each stage, effectively reducing internal leakage and improving volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression process not only reduces the compression ratio but also significantly lowers noise levels, particularly during unloading, ensuring a quieter operation.
11) Effortless Maintenance and Service:Maintenance and service are a breeze. Apart from the advanced screw air end, our two-stage compressor's systems and structures are akin to single-stage units, ensuring user-friendly maintenance and operation.
1. Unbeatable Price Advantage
We present our clients with highly competitive ex-factory prices, ensuring you maintain a significant edge in the marketplace.
2. Direct Transactions
Our products are delivered directly from our factory, allowing us to provide you with the most cost-effective solutions available.
3. Comprehensive OEM & ODM Services
Leveraging our extensive production and management capabilities, we proficiently meet your OEM and ODM service requirements without a hitch.
4. Tailored Customization
We embrace non-standard, export, and customized voltage/power/pressure orders. Connect with us to discuss your unique specifications, and we will meet your needs to perfection.
5. Small Order Acceptance
Initiate with a small trial order to experience the exceptional quality of our offerings firsthand.
6. Rapid Delivery
We guarantee prompt and timely delivery of our superior products, ensuring the seamless continuity of your operations.
7. Comprehensive Authorization
For our valued distributors, we provide complete authorization certification, empowering you to market and sell our esteemed SANZHI brand products with confidence.
Successful Cases
Sanzhi (Henan) Compressor Co., Ltd. stands as a distinguished leader in the manufacturing of screw air compressors and screw vacuum pumps, with over ten years of unparalleled industry know-how. Our comprehensive product range features normal and 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 for laser cutting, versatile single-tank and double-tank mobile screw air compressors, as well as electric and diesel mobile screw air compressors and screw vacuum pumps, among other innovative offerings.
In our cutting-edge production facility, we set the benchmark for efficiency with our advanced, lean multi-air compressor assembly lines. Our dedicated team of over 50 skilled employees continually refines our robust management systems, including ERP, to minimize lead times and guarantee the swift delivery of superior quality products.
Our unwavering commitment to quality management has earned us the prestigious ISO9001 certification. We adhere to the highest standards, rigorously inspecting each machine through comprehensive material checks, meticulous production evaluations, and thorough pre-delivery assessments.
Our exceptional customer service spans from pre-sales to after-sales support. Before purchase, we offer expert guidance in selecting the perfect air equipment and provide high degrees of customization, including bespoke OEM products tailored to specific dealer requirements. Post-purchase, our professional sales and service teams stand ready to respond promptly to customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd., our mission is to deliver outstanding, dependable products while cultivating enduring customer relationships. With our commitment to timely delivery, unmatched quality, and competitive pricing, we are your trusted partner for unrivaled compressed air solutions.
Our factory is strategically located in Xinzheng City, Henan Province, China, ensuring easy access. We provide complimentary transportation from Xinzheng International Airport to our facility, just 30 kilometers away-a convenient one-hour journey. We eagerly anticipate welcoming you to our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a seasoned manufacturer of screw air compressors, backed by over a decade of industry expertise.
Q2. How do you control quality?
A: 1. We implement stringent inspections on all raw materials.
2. We enforce strict control over installation processes.
3. Each machine undergoes a rigorous minimum of 5 hours of continuous testing prior to 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 this information, and we will customize the perfect 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 come in 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p, with further customization available to meet your exact specifications.
Q6. How long is the delivery time?
A: For standard voltage configurations, our delivery time is an impressively swift 15 working days following the confirmation of your order. For any non-standard requirements, we invite you to reach out to our dedicated sales team for personalized assistance.
Q7. What are the payment terms?
A: We accept a 30% T/T advance payment, followed by a 40% T/T payment before shipment, and the final 30% T/T upon receipt of the B/L copy. Payments are accepted in both USD and RMB.
Q8. What is your warranty policy?
A: We provide a comprehensive one-year warranty for the entire machine, alongside an extended two-year warranty specifically for the screw air compressor, excluding consumable spare parts.
Q9. What is the maintenance schedule?
A: Initial maintenance should be performed after the first 500 hours of operation. Subsequent maintenance should be conducted every 2000-3000 hours, depending on the actual working environment.
Q10. Can your machines operate in high-temperature environments?
A: Absolutely. Our machines are meticulously engineered to function efficiently even in high-temperature environments, with an operational temperature range from -20°C to 45°C (-4°F to 113°F).
Q11. Do you provide OEM services?
A: Yes, we proudly offer both OEM and ODM services. Our expert design team welcomes customized orders with enthusiasm.
Q12. What is the lifespan of your air compressors?
A: Our air compressors are designed for longevity, typically offering more than 10 years of reliable service.
Q13. Do you supply spare parts for your machines?
A: Certainly. We provide a full range of spare parts to ensure the uninterrupted operation of your machines.
Q14. What kind of after-sales service do you offer?
A: We offer extensive after-sales support, including online installation and commissioning instructions. Additionally, we can arrange for our skilled engineers to assist with training and on-site installation.
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