Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage pressure transmission matches the total energy needed for multi-stage compression. However, due to factors like coupling transmission losses, bearing friction, and the cooling effect of viscosity, the actual operational power increases. By reducing the compression ratio at each stage, overall power consumption in multi-stage compression can be significantly lowered, making it far more efficient than single-stage compression.
The two-stage screw air compressor boasts a brilliant dual-stage rotary screw system, incorporating both active and passive screws at each stage. The active screw propels the passive screw through an external power mechanism. In the first stage, a low-pressure rate screw assembly is utilized, while the second stage employs a high-pressure rate screw assembly. Each screw is encased in a sealing air film. During operation, air undergoes three critical processes: suction, pressurization, and exhaust.
First Stage Compression: Initially, the two-stage screw air compressor's low-pressure rate screw assembly compresses the gas between the screws. The gas is drawn into the compression chamber through the suction valve. As the screw rotor rotates at high speed, the gas is progressively compressed and transferred to the next stage.
Second Stage Compression: In this phase, the gas enters a more confined screw space, facing increased temperatures and pressures. The exhaust valve subsequently opens to discharge the high-pressure gases from the system, completing the compression process.
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 intermediate pressure. The compressed gas then travels through a cooling channel, encountering a significant oil mist that dramatically reduces its temperature. This cooled gas then enters the second-stage rotor for further compression, achieving the final exhaust pressure. Finally, the compressor expels the gas through the exhaust valve, concluding the intricate 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 an extraordinary leap in efficiency with our advanced PM motor! Featuring a wide constant torque and weak magnetic ranges, it delivers an astounding 20-30% efficiency boost over traditional motors. Even beyond the rated frequency, our permanent magnet motor maintains its superior output, ensuring top-notch performance at all times.
2) Maintenance-Free Motor:Say goodbye to the hassle of bearing maintenance and replacements. Our state-of-the-art permanent magnet motor is expertly engineered without bearings, providing you with a truly maintenance-free, cost-effective solution.
3) Advanced Integrated Frequency Converter:Equipped with China's leading frequency system, our unit excels in extensive speed regulation and unparalleled precision. It seamlessly synchronizes with actual gas demands, delivering outstanding 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 absolute zero transmission loss.
5) Variable and Soft Start MechanismsProtect your power grid equipment with our variable frequency start and soft start features. These mechanisms reduce impact and prevent potential damage to electrical components.
6) Enhanced Energy Conservation:With a frequency conversion range of 25% to 100%, compared to the usual 50%-100%, our unit achieves over 30% energy savings versus fixed-speed compressors. In systems with fluctuating gas consumption, the energy savings are even more significant.
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. Driven by gears, each stage achieves optimal linear speeds, vastly enhancing overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Our pioneering internal spray curtain cooling method dramatically lowers compressed air temperature, achieving near-isothermal compression. This technique reduces pressure loss and significantly boosts compression efficiency.
9) Minimized Internal Leakage:Through two-stage compression, we reduce the compression ratio for each stage, effectively minimizing internal leakage and enhancing volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression process not only reduces the compression ratio but also significantly decreases noise levels, especially during unloading, ensuring quieter, smoother operation.
11) Effortless Maintenance and Service:Maintenance and service are remarkably straightforward. Beyond the advanced screw air end, our two-stage compressor systems and structures are similar to single-stage units, ensuring ease of maintenance and user-friendly operation.
12) Door Panels are Removable:The unit's casing is made of metal plate with noise reduction treatment, and the casing panel is equipped with high-density sound-absorbing material, ensuring the noise level meets international standards. The door plate can be opened and disassembled, offering a 270-degree all-round space, facilitating maintenance personnel access to the interior, thus enhancing service efficiency.
1. Unbeatable Price Advantage
We offer our clients not just prices, but highly competitive ex-factory rates that ensure you stand out in the marketplace. Embrace unmatched value that significantly boosts your profitability.
2. Direct Transactions
Our products are dispatched directly from our factory, allowing us to present you with the most cost-effective solutions possible. Bypass intermediaries for pure, undiluted value.
3. Comprehensive OEM & ODM Services
Utilizing our extensive production and management expertise, we seamlessly fulfill your OEM and ODM service requirements. We transform your unique ideas into tangible, high-quality realities.
4. Tailored Customization
We gladly accommodate non-standard, export, and custom voltage/power/pressure orders. Engage with us to discuss your specific needs, and we will deliver with precision. Discover the pinnacle of personalization.
5. Small Order Acceptance
Start with a small trial order to firsthand experience the superior quality of our products. See our unwavering commitment to excellence right from the beginning.
6. Rapid Delivery
We assure swift and punctual delivery of our premium products, maintaining the seamless flow of your operations. Count on us for exceptional reliability and speed.
7. Comprehensive Authorization
For our esteemed distributors, we provide full authorization certification, allowing you to confidently market and sell our prestigious SANZHI brand products. Broaden your business horizons with SANZHI.
Sanzhi (Henan) Compressor Co., Ltd, a renowned leader in the manufacturing industry, specializes in producing exceptional screw air compressors and vacuum pumps with over a decade of steadfast commitment. Our comprehensive portfolio encompasses standard and low-pressure screw air compressors, cutting-edge permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, and versatile mobile screw compressors. We provide single and double-tank configurations available in both electric and diesel options, along with innovative screw vacuum pumps.
Our production processes epitomize efficiency and modernity, featuring cutting-edge multi-air compressor assembly lines. With a dedicated team of over 50 skilled employees, we consistently refine our ERP-based management systems, significantly reducing lead times and ensuring the prompt delivery of top-tier products.
Adhering to stringent standards, our factory proudly holds ISO9001 certification, reflecting our unwavering commitment to quality management. We rigorously enforce strict quality control measures, ensuring each machine undergoes thorough material inspections, meticulous production evaluations, and comprehensive pre-delivery checks before it leaves our facility.
Our customer service philosophy is unmatched. Our pre-sales team provides expert guidance to help you select the ideal air equipment, supported by extensive customization options for appearance and configuration. We excel in crafting bespoke OEM products tailored to specific dealer requirements. Our after-sales team, comprising seasoned professionals, guarantees rapid and effective responses to all customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are devoted to delivering high-performance, reliable products that nurture enduring customer relationships. Our efficient delivery schedules, superior machines, and competitive pricing ensure you receive outstanding compressed air solutions every time.
Conveniently situated in Xinzheng City, Henan Province, China, our factory is easily accessible. We offer complimentary transportation from Xinzheng International Airport to our premises, a brief 30-kilometer journey that takes approximately one hour. We warmly welcome your visit!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a dedicated manufacturer specializing in screw air compressors with over a decade of professional experience.
Q2. How do you control quality?
A: 1. Strict inspection of raw materials.
2. Rigorous control of 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. 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 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 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: Expect a swift lead time of approximately 15 working days post order confirmation for our standard voltage specifications. For custom non-standard voltage needs, we encourage you to contact our dedicated sales team for a bespoke delivery schedule tailored to your requirements.
Q7. What's the payment term?
A: Our payment terms are as straightforward as they are secure: an initial 30% T/T deposit in advance, followed by 40% T/T before shipment, with the remaining 30% T/T due upon receipt of the B/L copy. To enhance your convenience, we accept payments in both USD and RMB.
Q8. How about your warranty?
A: We proudly offer an industry-leading warranty, which includes one year of comprehensive coverage for the entire machine, along with an extended two-year warranty specifically for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: Initial maintenance should be conducted after 500 hours of operation. Thereafter, we recommend routine maintenance intervals between 2000-3000 hours, depending on specific working conditions, to maintain optimal performance.
Q10. Can machines be run in high-temperature environment?
A: Absolutely. Our machines are meticulously engineered to perform efficiently even in high-temperature environments, boasting an operational temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we proudly offer both OEM and ODM services. Our professional design team is dedicated to providing flexible solutions tailored to meet your specific requirements.
Q12. How long could your air compressor be used?
A: Our air compressors are engineered for exceptional durability, typically offering an impressive lifespan that exceeds 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we ensure the availability of essential spare parts for all our machines, guaranteeing seamless and uninterrupted operation.
Q14. How about your after-sales service?
A: We provide comprehensive after-sales support, which includes online guidance for installation and commissioning. Additionally, we can dispatch experienced engineers for on-site training and installation assistance to fully ensure your satisfaction.
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