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 reality, this ideal is disrupted by coupling transmission losses, bearing friction, and the cooling effect of viscosity. These factors cause an increase in actual operational power. By minimizing the compression ratio at each stage, the overall power consumption is reduced in multi-stage compression, making it significantly more efficient than single-stage compression.
The two-stage screw air compressor incorporates a dual-stage rotary screw system with active and passive screws at each stage. The active screw drives the passive screw through an external power mechanism. The first stage features a low-pressure rate screw group, while the second stage is equipped with a high-pressure rate screw group. Each screw is enveloped by a sealing air film. During operation, the air undergoes three essential processes: suction, pressurization, and exhaust.
First Stage Compression: In this initial stage, the two-stage screw air compressor employs a low-pressure rate screw group to compress the gas between the screws. The gas is drawn into the compression chamber through the suction valve. As the screw rotor spins at high speed, the gas is progressively compressed and subsequently transferred to the next stage.
Second Stage Compression: In this stage, the gas enters a more confined screw space, experiencing heightened temperatures and pressures. The exhaust valve then opens, releasing the high-pressure gases from the system, thus completing the compression cycle.
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 interstage pressure. The compressed gas passes through a cooling channel, encountering significant oil mist that substantially lowers its temperature. This cooled gas enters the second-stage rotor for further compression, achieving the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, finalizing 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 the pinnacle of efficiency with our PM motor! Boasting a broad constant torque and weak magnetic range, this motor achieves an astounding 20-30% higher efficiency compared to conventional motors. Even beyond the rated frequency, our permanent magnet motor continues to deliver exceptional efficiency, guaranteeing superior performance whenever you need it.
2) Maintenance-Free Motor:Eliminate the high costs associated with bearing maintenance and replacements. Our revolutionary permanent magnet motor features a design without bearings, providing a truly maintenance-free experience.
3) Advanced Integrated Frequency Converter:Fitted with China's top-tier frequency system, our unit offers extensive speed regulation and unmatched precision. It effortlessly adapts to real-time gas demand, offering remarkable energy savings and performance.
4) Zero Transmission Loss:Achieve perfect transmission efficiency with our compact, integrated shaft connection. The direct drive structure removes the need for couplings and other transmission components, ensuring zero loss in transmission.
5) Variable and Soft Start MechanismsSafeguard your power grid equipment with our variable frequency start and soft start functions. These features minimize impact and prevent damage to your electrical components.
6) Enhanced Energy Conservation:Thanks to a frequency conversion range of 25% to 100%, compared to the usual 50%-100%, our unit delivers over 30% energy savings compared to fixed-speed compressors. In systems with fluctuating gas consumption, the energy-saving impact is even greater.
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. Gears drive each stage to achieve optimal linear speeds, significantly boosting overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Our highly efficient internal spray curtain cooling method drastically lowers compressed air temperature, achieving near-isothermal compression. This innovative approach reduces pressure loss and enhances compression efficiency.
9) Minimized Internal Leakage:Utilizing 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 lowers the compression ratio but also significantly reduces noise levels, especially during unloading, ensuring a quieter operation.
11) Effortless Maintenance and Service:Maintenance and service are simplified. Besides the advanced screw air end, our two-stage compressor features systems and structures similar to single-stage units, ensuring straightforward maintenance and 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 inside of the unit, thus enhancing service efficiency.
1. Unbeatable Pricing Power
We offer our clients incredibly competitive ex-factory prices, ensuring you sustain a significant competitive edge in the marketplace.
2. Direct Supply Chain
Our products are dispatched directly from our factory, allowing us to offer you the most cost-effective solutions available.
3. Comprehensive OEM & ODM Services
Utilizing our broad production and management capabilities, we efficaciously fulfill your OEM and ODM service requirements seamlessly.
4. Customized Solutions
We welcome non-standard, export, and customized voltage/power/pressure orders. Reach out to discuss your unique specifications, and we will surpass your expectations.
5. Small Order Acceptance
Start with a small trial order to witness the exceptional quality of our offerings firsthand.
6. Speedy Delivery
We ensure prompt and timely delivery of our superior products, guaranteeing the seamless continuity of your operations.
7. Full Authorization
For our esteemed distributors, we provide complete authorization certification, empowering you to market and sell our renowned SANZHI brand products with confidence.
Sanzhi (Henan) Compressor Co., Ltd, an established powerhouse in the manufacturing realm, excels in crafting superior screw air compressors and vacuum pumps, with over ten years of unwavering dedication. Our extensive range includes standard and low-pressure screw air compressors, advanced permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, and versatile mobile screw compressors. We offer single and double-tank configurations in both electric and diesel options, as well as innovative screw vacuum pumps.
Our production processes are a testament to efficiency and modernity, featuring state-of-the-art multi-air compressor assembly lines. With a team of over 50 proficient employees, we continually refine our ERP-based management systems, significantly reducing lead times and guaranteeing the prompt delivery of superior quality products.
Adhering to rigorous standards, our factory proudly holds ISO9001 certification, underscoring our commitment to quality management. We meticulously enforce stringent quality control measures, ensuring each machine undergoes comprehensive material inspections, production evaluations, and thorough pre-delivery checks before it leaves our facility.
Our customer service ethos is unparalleled. Our pre-sales team offers expert advice to help you choose the perfect air equipment, backed 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, comprised of seasoned professionals, guarantees rapid and effective responses to all customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering high-performance, reliable products that foster lasting customer relationships. Our efficient delivery schedules, top-notch machines, and competitive pricing ensure you receive outstanding compressed air solutions every time.
Conveniently located 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, boasting 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: 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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