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 engineered with a dual-stage rotary screw system, where each stage is equipped with both an active and passive screw. The active screw drives the passive screw with the help of an external power source. This innovative design employs a low-pressure rate screw group for the initial stage and transitions to a high-pressure rate screw group in the second stage. Each screw is encased in a sealing air film to optimize efficiency. As the screws rotate, the air undergoes a comprehensive transformation through three pivotal processes: suction, pressurization, and exhaust.
First Stage Compression: Within the initial stage of the two-stage screw air compressor, a specialized low-pressure rate screw group works diligently to compress the gas, which is drawn into the compression chamber via the suction valve. The high-speed rotation of the screw rotor compresses the gas, preparing it for the subsequent stage.
Second Stage Compression: As the gas progresses into this stage, it encounters a more confined screw space, significantly elevating its temperature and pressure. The exhaust valve opens strategically to release the high-pressure gases efficiently from the system, marking the culmination of the compression process.
Natural air is meticulously drawn into the first compression stage through an air filter, where it harmoniously blends with a precise amount of lubricating oil. This mixture is adeptly compressed to an interstage pressure. Post-compression, the gas journeys through a cooling channel, encountering a substantial oil mist that dramatically lowers its temperature. This cooled gas is then propelled into the second-stage rotor, undergoing further compression to achieve the desired final exhaust pressure. Ultimately, the compressor expertly expels the gas through the exhaust valve, flawlessly completing the entire 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:The breadth of constant torque and weak magnetic ranges in our PM motor is remarkably wider, enhancing efficiency by 20-30% compared to traditional motors. This permanent magnet motor retains its superior efficiency even when operating away from the rated frequency, delivering extraordinary performance consistently.
2) Maintenance-Free Motor:Ingeniously crafted without bearings, our permanent magnet motor eradicates the need for costly bearing maintenance and replacement, ensuring a maintenance-free experience.
3) Advanced Integrated Frequency Converter:Equipped with China's premier frequency system, this unit boasts extensive speed regulation and high precision, adapting seamlessly to the actual gas demand with outstanding energy-saving capabilities.
4) Zero Transmission Loss:The compact, integrated shaft connection between the permanent magnet motor and compressor eliminates couplings and other transmission components, achieving a perfect 100% transmission efficiency.
5) Variable and Soft Start MechanismsOur variable frequency start and soft start functions protect power grid equipment by minimizing impact, thus safeguarding electrical components from damage.
6) Enhanced Energy Conservation:Boasting a frequency conversion range of 25% to 100% (unlike the usual 50%-100%), this unit achieves over 30% energy savings compared to fixed-speed compressors. For systems with fluctuating gas demands, the energy-saving effect is even more substantial.
7) Unique Two-Stage Compression Air End:Our two-stage compression screw design integrates both the first and second-stage rotors within a single casing. Driven by gears, each stage optimizes linear speeds, significantly increasing overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Utilizing a high-energy saving internal spray curtain cooling technique, it markedly decreases the compressed air temperature, achieving nearly isothermal compression. This innovation reduces pressure loss and boosts compression efficiency.
9) Minimized Internal Leakage:Through two-stage compression, the compression ratio for each stage is lowered, effectively reducing internal leakage and enhancing volumetric efficiency.
10) Superior Noise Reduction:The two-stage compression design not only decreases the compression ratio but also dramatically lessens noise levels, particularly noticeable during unloading.
11) Effortless Maintenance and Service:With system and structural similarities to single-stage compression units, aside from the screw air end, the two-stage compressor ensures user-convenient maintenance and operation.
12) Door Panels are Removable:Constructed with sound-dampening metal panels and lined with high-density sound-absorbing materials, the unit complies with international noise standards. The removable door panels offer expansive 270-degree access, significantly simplifying maintenance tasks and enhancing service efficiency.
1. Unbeatable Price Advantage
We offer our valued customers access to competitive, factory-direct pricing, ensuring you maintain a leading edge in the market dynamics.
2. Direct Transactions
Leveraging direct factory supply for all our products, we are equipped to present you with the most cost-effective solutions available.
3. Comprehensive OEM & ODM Services
Harnessing our extensive production expertise and robust management capabilities, we efficiently fulfill all your OEM/ODM service requirements with unrivaled precision.
4. Tailored Customization
Embrace our bespoke approach with custom orders that cater to non-standard, export, voltage/power/pressure specifications. Engage with us to discuss your unique needs, and we will craft a solution that perfectly meets your demands.
5. Small Order Acceptance
Commence with a small trial order and experience firsthand the superior quality that our products consistently deliver.
6. Rapid Delivery
Our commitment to timely delivery ensures that our high-quality products reach you swiftly, keeping your operations uninterrupted and on track.
7. Comprehensive Authorization
For our esteemed distributors, we offer complete authorization certification, empowering you to confidently market our prestigious SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd. stands as a distinguished leader in the manufacturing realm, celebrated for our specialized expertise in screw air compressors and screw vacuum pumps. With over ten years of refined industry prowess under our belt, we offer an expansive array of products. Our impressive lineup encompasses normal pressure 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, dynamic single-tank and double-tank mobile screw air compressors, versatile electric and diesel mobile screw air compressors, and state-of-the-art screw vacuum pumps, among other innovations.
In our avant-garde production facility, we harness unmatched efficiency through our meticulously engineered, lean multi-air compressor assembly lines. Our operation is buoyed by a dedicated team of over 50 exceptional employees, thriving on continuous management system enhancements, including ERP, to seamlessly minimize lead times and guarantee the rapid delivery of superior quality products.
With an unwavering commitment to quality management, our factory proudly holds ISO9001 certification. We strictly observe rigorous quality management protocols, ensuring each machine is subject to comprehensive inspections, encompassing material checks, production evaluations, and rigorous pre-delivery assessments.
Our exemplary customer service journey spans from pre-sales to after-sales. Prior to purchase, we provide expert consultation to guide you in selecting the perfect air equipment, offering extensive customization, including bespoke OEM products tailored to meet specific dealer needs. Post-purchase, our highly skilled sales and service team remains at the ready, poised to swiftly address and fulfill customer requests.
At Sanzhi (Henan) Compressor Co., Ltd., we are unwaveringly devoted to delivering superior, dependable products while nurturing enduring customer relationships. Our steadfast commitment to efficient delivery, outstanding quality, and competitive pricing makes us your esteemed partner for the most effective compressed air solutions.
Our strategically situated factory in Xinzheng City, Henan Province, China, offers complimentary transportation from Xinzheng International Airport, located just 30 kilometers away. This convenient, approximately one-hour journey ensures a warm welcome to our esteemed company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a distinguished manufacturer specializing in screw air compressors, boasting over a decade of industry excellence.
Q2. How do you control quality?
A: 1. We conduct rigorous inspections of all raw materials to ensure top-notch quality.
2. We uphold strict control over installation procedures to maintain superior standards.
3. Every machine undergoes at least five hours of continuous testing before it is dispatched to guarantee reliability.
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 with this precise information, and we will craft a tailored solution to perfectly suit your needs!
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 cater to a variety of voltage requirements, including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p, with additional customization options available to precisely meet your unique specifications.
Q6. How long is the delivery time?
A: For orders with standard voltage, we pride ourselves on a remarkably quick delivery time of just 15 working days following your order confirmation. For non-standard specifications, please don't hesitate to contact our exceptional sales team for tailored assistance.
Q7. What's the payment term?
A: Our payment terms are designed for flexibility and convenience, accepting 30% T/T in advance, 40% T/T before shipment, and the final 30% T/T on receipt of the B/L copy. You may choose to make payments in either USD or RMB.
Q8. How about your warranty?
A: We proudly stand by our products with a robust one-year warranty for the entire machine, coupled with an enhanced two-year warranty for the screw air compressor. Please note, consumable spare parts are not included.
Q9. What about the maintenance?
A: The initial maintenance should be scheduled after 500 hours of operation. Following this, we recommend regular maintenance every 2000-3000 hours, tailored to the actual working environment to ensure optimal performance.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are expertly engineered to perform with excellence in high-temperature environments, comfortably operating within a temperature range of -20° to 45°(-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, indeed! We are delighted to offer OEM & ODM services. With the proficiency of our talented design team, we welcome customized orders to meet your unique requirements.
Q12. How long could your air compressor be used?
A: Our air compressors boast impressive durability, crafted to last and provide reliable performance for more than 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, to guarantee the uninterrupted operation of your machines, we supply essential spare parts as needed.
Q14. How about your after-sales service?
A: We offer a comprehensive suite of after-sales services, including online guidance for installation and commissioning. Furthermore, we can arrange for our highly skilled engineers to offer hands-on training and installation assistance.
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