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. However, in practice, factors like coupling transmission losses, bearing friction, and the viscosity's cooling effect result in increased operational power. By minimizing the compression ratio at each stage, overall power consumption in multi-stage compression is significantly reduced, making it much more efficient than single-stage compression.
The two-stage screw air compressor from Sanzhi (Henan) Compressor Co., Ltd. is ingeniously designed with a dual-stage rotary screw system that features both active and passive screws at each stage. The active screw drives the passive screw via an external power mechanism. The initial stage utilizes a low-pressure rate screw assembly, while the secondary stage employs a high-pressure rate screw assembly. Each screw is enveloped by a sealing air film. During operation, air undergoes three vital processes: suction, pressurization, and exhaust.
First Stage Compression: In the initial phase of the two-stage screw air compressor, a low-pressure rate screw assembly 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 subsequent stage.
Second Stage Compression: During this phase, 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, concluding 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 then compressed to an intermediate pressure. The compressed gas 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 this intricate and highly efficient 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 a revolutionary leap in efficiency with our PM motor! Featuring a broad constant torque and weak magnetic ranges, it delivers a phenomenal 20-30% efficiency boost over traditional motors. Even beyond the rated frequency, our permanent magnet motor retains its superior output, ensuring exceptional performance at all times.
2) Maintenance-Free Motor:Eliminate the hassle of bearing maintenance and replacements. Our innovative permanent magnet motor is expertly engineered without bearings, offering you a truly maintenance-free, cost-effective experience.
3) Advanced Integrated Frequency Converter:Fitted with China's leading frequency system, our unit excels in extensive speed regulation and unmatched precision. It seamlessly aligns with actual gas demands, delivering exceptional 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 to ensure absolute zero transmission loss.
5) Variable and Soft Start MechanismsSafeguard 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 ordinary 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 cutting-edge 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 drastically lowers compressed air temperature, achieving near-isothermal compression. This technique reduces pressure loss and boosts compression efficiency.
9) Minimized Internal Leakage:Through two-stage compression, we lower the compression ratio for each stage, effectively reducing internal leakage and enhancing volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression process not only diminishes the compression ratio but also significantly curtails noise levels, especially during unloading, ensuring a 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 resemble those of 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. This ensures 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 inside of the unit, thus enhancing service efficiency.
1. Unbeatable Price Advantage
We offer our clients highly competitive ex-factory prices, ensuring you maintain a significant edge in the marketplace. Experience unmatched value that enhances your profitability.
2. Direct Factory Transactions
Our products are delivered directly from our factory, allowing us to provide you with the most cost-effective solutions available. No intermediaries mean pure value for you.
3. Comprehensive OEM & ODM Services
Leveraging our extensive production and management capabilities, we proficiently meet your OEM and ODM service requirements without a hitch. We turn your customized ideas into reality with excellence.
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. Personalization at its finest.
5. Small Order Acceptance
Initiate with a small trial order to experience our exceptional quality firsthand. Witness our commitment to excellence from the very start.
6. Rapid Delivery
We guarantee prompt and timely delivery of our superior products, ensuring the seamless continuity of your operations. Depend on us for reliability and speed.
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. Expand your business horizons with SANZHI.
Sanzhi (Henan) Compressor Co., Ltd, a renowned leader in the manufacturing industry, specializes in producing high-quality screw air compressors and vacuum pumps. With over a decade of dedicated expertise, our comprehensive product line includes standard and low-pressure screw air compressors, innovative permanent magnet frequency conversion models, robust two-stage compression units, specialized compressors for laser cutting, and versatile mobile screw compressors. We provide both single and double-tank configurations in electric and diesel variants, along with pioneering screw vacuum pumps.
Our production processes epitomize efficiency and modernization, featuring cutting-edge multi-air compressor assembly lines. With a skilled team of over 50 employees, we constantly enhance our ERP-based management systems, significantly reducing lead times and ensuring the timely delivery of superior products.
Adhering to strict standards, our factory proudly boasts ISO9001 certification, highlighting our unwavering commitment to quality management. We rigorously implement stringent quality control protocols, ensuring that each machine undergoes comprehensive material inspections, detailed production evaluations, and thorough pre-delivery checks before leaving our facility.
Our customer service philosophy is second to none. Our pre-sales team provides expert recommendations to help you select the ideal air equipment, supported by extensive customization options for appearance and configuration. We also excel in crafting bespoke OEM products tailored to specific dealer needs. Our after-sales team, composed of experienced professionals, ensures quick and effective responses to all customer inquiries and requirements.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering high-performance, reliable products that cultivate enduring customer relationships. Our efficient delivery schedules, high-quality machines, and competitive pricing guarantee you receive exceptional compressed air solutions every time.
Strategically located in Xinzheng City, Henan Province, China, our factory is easily accessible. We offer complimentary transportation from Xinzheng International Airport to our premises, a short 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. Stringent inspection of raw materials.
2. Rigorous control of assembly 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: For our standard voltage specifications, you can anticipate a swift lead time of approximately 15 working days post order confirmation. Should you need custom non-standard voltage specifications, please contact our dedicated sales team for a personalized delivery schedule.
Q7. What's the payment term?
A: Our payment terms are designed to be straightforward and 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. We accept payments in both USD and RMB for your convenience.
Q8. How about your warranty?
A: We offer an industry-leading warranty, which includes one year of comprehensive coverage 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: Initial maintenance should be conducted after 500 hours of operation. Subsequently, routine maintenance intervals are recommended between 2000-3000 hours, depending on specific working conditions, to ensure 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, with an operational temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we offer both OEM and ODM services. Our professional design team is committed to providing flexible solutions 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 a lifespan that exceeds 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we ensure the availability of spare parts for all our machines to guarantee seamless operation.
Q14. How about your after-sales service?
A: We provide comprehensive after-sales support, including online guidance for installation and commissioning. Additionally, we can dispatch experienced engineers for on-site training and installation assistance to ensure your satisfaction.
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