Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission is theoretically equal to the sum of the power required for multi-stage compression. However, real-world dynamics such as coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity cause the actual working power to increase. By reducing the compression ratio of each stage, we can minimize these losses, making the total power required for multi-stage compression significantly less than that for single-stage compression.
The two-stage screw air compressor features a sophisticated design involving a two-stage rotary screw mechanism. Each stage includes an active and a passive screw, with the active screw driving the passive one via an external power transmission system. The first stage utilizes a low-pressure rate screw set, while the second stage employs a high-pressure rate screw set. An air film seals around each screw, facilitating gas compression through three pivotal processes: suction, pressurization, and exhaust.
First Stage Compression: At the initial stage, the low-pressure rate screw set compresses the gas. The gas is drawn into the screw compression chamber through a suction valve. With the high-speed rotation of the screw rotor, the gas is gradually compressed and then transferred to the second stage.
Second Stage Compression: In this stage, the gas enters a more confined screw space where it is compressed at significant temperature and pressure. The exhaust valve then opens, expelling the high-pressure gases from the system.
The air compression journey begins as natural air enters the first stage through an air filter, mixing with a small amount of lubricating oil in the compression chamber. The mixed gas is then compressed to an intermediate pressure. The resultant compressed gas is directed into a cooling channel where it encounters a large volume of oil mist, dramatically reducing its temperature. This cooled, compressed gas then enters the second-stage rotor, undergoes further compression, and is finally expelled through the exhaust valve, completing the entire compression process.
Water-cooled compressors utilize water as the primary cooling medium. As the cooling water circulates within the air compressor, it not only cleans but also lubricates, significantly enhancing the lifespan of friction-worn components. During operation, the cooling water efficiently extracts heat from both the cylinder and the compressed gas, thereby reducing exhaust temperature, lowering power consumption, and cutting operational costs of the air compressor. However, it's important to address the potential issue of scaling within the water cooling system.
1) High Efficiency of PM Motor:With an expansive constant torque and weak magnetic range, the efficiency of the permanent magnet motor surpasses that of conventional motors by 20-30%. Even when operating outside the rated frequency, the permanent magnet motor maintains its exceptional efficiency, ensuring consistently high motor performance.
2) Maintenance-Free Motor:The permanent magnet motor is designed without internal bearings, thereby eliminating the costs associated with bearing maintenance and replacement.
3) Integrated Frequency Converter: Featuring China's top frequency system, this converter offers a wide range of speed regulation with high precision. By adjusting frequency based on actual gas demand, the air compressor achieves remarkable energy savings.
4) No Transmission Loss: The integrated, directly-connected structure of the permanent magnet motor and compressor eliminates coupling and other transmission parts, ensuring 100% transmission efficiency with a more compact design.
5) Variable Frequency Start and Soft StartThis feature significantly reduces the impact on power grid equipment, preventing damage to electrical components.
6) Energy Consumption Reduction: With a frequency conversion range from 25% to 100% (compared to ordinary conversion ranges of 50% to 100%), this system can save over 30% in energy compared to fixed-speed air compressors. It also offers an additional 5% energy savings over traditional variable frequency air compressors. The greater the system's gas consumption fluctuation, the more pronounced the energy-saving effect.
7) Unique Two-Stage Compression Air End:This innovative design integrates the first and second stage compression rotors within a single case, driven independently by gears. Each rotor achieves optimal linear speed, enhancing compression efficiency.
8) Internal Spray Curtain Cooling Method: Employing a high energy-saving internal spray curtain cooling technique, this method significantly reduces the temperature of compressed air, approximating isothermal compression. It also minimizes pressure loss between stages, lowers the compression ratio, and boosts compression efficiency.
9) Reduction of Internal Leakage:The two-stage compression system decreases the compression ratio for each stage, reducing internal leakage from high-pressure to low-pressure ends and improving volumetric efficiency.
10) Noise Reduction:By lowering the compression ratio, two-stage compression notably reduces noise levels, especially during unloading.
11) Easy Maintenance and Service:Apart from the screw air end, other systems and structures in the two-stage compressor unit are similar to those in single-stage units, facilitating ease of maintenance and use.
1. Price Advantage
We offer direct ex-factory prices to our customers, ensuring they remain highly competitive in their markets.
2. Direct Deals
All our products are delivered straight from the factory, ensuring you receive the most cost-effective solutions available.
3. OEM & ODM Services
Leveraging our robust production and management capabilities, we provide top-notch OEM/ODM services tailored to your needs.
4. Customised Service
We accommodate non-standard orders, export orders, and custom specifications for voltage, power, and pressure. Reach out to us with your specific requirements for bespoke solutions.
5. Small Order Acceptance
Begin with a small trial order to evaluate the exceptional quality of our products firsthand.
6. Expedited Delivery
Receive high-quality products with the assurance of timely delivery every single time.
7. Comprehensive Authorisation
For our distributors, we offer complete authorization certificates, empowering you to market and sell our prestigious 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 expect a prompt lead time of typically 15 working days after confirming your order. If you require custom non-standard voltage specifications, please reach out to our dedicated sales team for tailored delivery timelines.
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 provide an industry-leading warranty, offering one year of 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 carried out after 500 hours of operation. After that, routine maintenance intervals are set 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 guarantee the availability of spare parts for all our machines to ensure 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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