Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage pressure transmission equals the total energy needed for multi-stage compression. However, factors such as coupling transmission losses, bearing friction, and the cooling effect of viscosity mean the actual operational power increases. By reducing the compression ratio at each stage, we can substantially lower the overall power consumption in multi-stage compression, rendering it significantly more efficient than single-stage compression.
The two-stage screw air compressor boasts a masterfully engineered dual-stage rotary screw system, featuring both active and passive screws at each stage. The active screw propels the passive screw via an external power source. The first stage employs a low-pressure rate screw assembly, while the second stage utilizes a high-pressure rate screw assembly. Each screw is surrounded by a sealing air film. During operation, air undergoes three crucial 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 through the suction valve. As the screw rotor rotates swiftly, the gas is gradually compressed and transferred to the next stage.
Second Stage Compression: During this phase, the gas enters a more confined screw space, experiencing higher temperatures and pressures. The exhaust valve then opens to release 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 passes through a cooling channel, encountering a significant oil mist that greatly reduces 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, 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:Witness a paradigm shift in efficiency with our PM motor! Boasting an expansive constant torque and weak magnetic ranges, it enhances efficiency by an impressive 20-30% over conventional motors. Even beyond the rated frequency, our permanent magnet motor maintains its superior output, ensuring stellar performance in all conditions.
2) Maintenance-Free Motor:Say goodbye to the hassle of bearing maintenance and replacements. Our cutting-edge permanent magnet motor is ingeniously designed without bearings, offering you a truly maintenance-free and cost-effective solution.
3) Advanced Integrated Frequency Converter:Equipped with China's premier frequency system, our unit excels with extensive speed regulation and unparalleled precision. It seamlessly adapts to actual gas demands, delivering extraordinary energy-saving performance.
4) Zero Transmission Loss:Achieve unrivaled 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 Mechanisms:Protect your power grid equipment with our variable frequency start and soft start features. These mechanisms mitigate impact and prevent potential damage to electrical components.
6) Enhanced Energy Conservation:Our unit's frequency conversion range of 25% to 100%, compared to the ordinary 50%-100%, achieves over 30% energy savings versus fixed-speed compressors. In systems with fluctuating gas consumption, the energy savings are even more substantial.
7) Unique Two-Stage Compression Air End:Featuring a state-of-the-art two-stage compression screw design, our system integrates 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 groundbreaking internal spray curtain cooling method significantly reduces compressed air temperature, achieving near-isothermal compression. This technique minimizes pressure loss and enhances compression efficiency.
9) Minimized Internal Leakage:Through two-stage compression, we reduce the compression ratio for each stage, effectively minimizing internal leakage and boosting volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression process not only lowers the compression ratio but also significantly reduces noise levels, particularly during unloading, ensuring a quieter, smoother operation.
11) Effortless Maintenance and Service:Maintenance and service are exceptionally simple. Beyond the advanced screw air end, our two-stage compressor systems and structures resemble single-stage units, ensuring ease of maintenance and user-friendly operation.
12) Door Panels are Removable:The unit's casing is constructed from noise-reducing treated metal plates, with panels featuring high-density sound-absorbing material, ensuring the noise level meets international standards. The door panel can be opened and disassembled, offering a 270-degree all-around space, facilitating maintenance personnel's access to the unit's interior and 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 Transactions
Our products are delivered directly from our factory, allowing us to provide you with the most cost-effective solutions available. No intermediaries, just pure value.
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 the exceptional quality of our offerings 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 distinguished leader in the manufacturing industry, specializes in producing top-tier screw air compressors and vacuum pumps. With over a decade of consistent dedication, we offer a wide-ranging portfolio that includes standard and low-pressure screw air compressors, cutting-edge permanent magnet frequency conversion models, sophisticated two-stage compression units, specialized compressors for laser cutting, and adaptable mobile screw compressors. Our products are available in both single and double-tank configurations, with options in electric and diesel, as well as pioneering screw vacuum pumps.
Our production processes epitomize efficiency and modernity, boasting state-of-the-art multi-air compressor assembly lines. Supported by a team of over 50 skilled employees, we continuously enhance our ERP-based management systems, drastically cutting down lead times and ensuring the swift delivery of premium products.
Upholding rigorous standards, our factory proudly holds ISO9001 certification, reflecting our unwavering commitment to quality management. We strictly implement comprehensive quality control measures, ensuring each machine undergoes meticulous material inspections, production evaluations, and thorough pre-delivery checks before it leaves our facility.
Our customer service philosophy is second to none. Our pre-sales team provides expert guidance to help you choose the ideal air equipment, complemented by extensive customization options for appearance and configuration. We also excel in creating bespoke OEM products tailored to specific dealer requirements. Our after-sales team, comprising seasoned professionals, ensures rapid and effective responses to all customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, our mission is to deliver high-performance, dependable products that nurture enduring customer relationships. Our efficient delivery schedules, superior machines, and competitive pricing guarantee exceptional compressed air solutions every time.
Strategically situated in Xinzheng City, Henan Province, China, our factory offers easy access. We provide complimentary transportation from Xinzheng International Airport to our premises, a brief 30-kilometer journey taking approximately one hour. We warmly welcome your visit!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a specialized manufacturer focused on screw air compressors, with over a decade of professional expertise.
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: 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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