Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission equals the combined power for multi-stage compression. However, due to factors such as coupling power loss, bearing friction, and the cooling effect of liquid viscosity, the actual working power is higher. By reducing the compression ratio at each stage, multi-stage compression requires less power than single-stage compression, effectively minimizing unnecessary power consumption.
The two-stage screw air compressor boasts a sophisticated two-stage rotary screw mechanism, featuring both an active and a passive screw in each stage. The active screw drives the passive one via an external power transmission device. The first stage utilizes a low-pressure screw group, while the second stage employs a high-pressure screw group. Encircling each screw is a sealing air film. As these screws rotate, gas undergoes suction, pressurization, and exhaust, thereby achieving highly efficient compression.
First Stage Compression: The initial stage of the two-stage screw air compressor utilizes a low-pressure screw group, compressing the gas between the screws. Gas enters the compression chamber through the suction valve. With the screw rotor's high-speed rotation, the gas is gradually compressed and then transferred to the second stage.
Second Stage Compression: In the second stage screw group, the gas enters a more confined screw space, where it is further compressed at elevated temperatures and pressures. The exhaust valve then opens, expelling the high-pressure gas from the system.
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 enters a cooling channel, where it encounters a substantial amount of oil mist, significantly lowering the temperature. The cooled, compressed gas proceeds to the second-stage rotor, undergoes further compression to the final exhaust pressure, and is ultimately discharged through the exhaust valve, completing the entire compression cycle.
Water-cooled compressors, leveraging water as the cooling medium, offer significant advantages. As cooling water circulates through the air compressor, it not only aids in cleaning but also enhances lubrication, thereby extending the lifespan of friction-wearing components. During operation, the cooling water absorbs heat from the cylinder and the compressed gas, effectively lowering exhaust temperature and power consumption, which in turn reduces operating costs. However, it's crucial to monitor and manage potential scaling issues in the water cooling system.
1) Outstanding Efficiency of PM Motor:Boasting a broader constant torque range and weak magnetic range, the permanent magnet motor operates with 20-30% higher efficiency compared to conventional motors. Remarkably, even when functioning away from the rated frequency, the efficiency remains consistently high, ensuring optimal performance.
2) Maintenance-Free Motor:The design of the permanent magnet motor is devoid of internal bearings, thereby eliminating the costs associated with bearing maintenance and replacement.
3) Integrated Frequency Converter:Utilizing China's premier frequency system, the converter offers a wide speed regulation range and high precision. It modulates operation based on actual gas demand, significantly enhancing the air compressor's energy efficiency.
4) Zero Transmission Loss:Thanks to the embedded integrated shaft design directly connecting the permanent magnet motor to the compressor, the structure is more compact. This eliminates couplings and other transmission parts, achieving 100% transmission efficiency.
5) Soft Variable Frequency Start:The motor's variable frequency and soft start capabilities drastically reduce impacts on power grid equipment, preventing potential damage to electrical components.
6) Enhanced Energy Conservation:With a frequency conversion range from 25% to 100% (compared to 50% to 100% in standard systems), this compressor saves over 30% more energy compared to fixed-speed models and about 5% more than conventional variable frequency compressors. Greater fluctuations in system gas consumption further amplify energy-saving effects.
7) Unique Two-Stage Compression Air End:The ingenious two-stage compression screw design houses both the first-stage and second-stage rotors within a single case, driven directly by gears. This configuration ensures optimal linear speed for each rotor stage, maximizing compression efficiency.
8) Innovative Internal Spray Curtain Cooling:By employing an energy-efficient internal spray curtain cooling method, the system delivers superior cooling. This approach significantly lowers the temperature of compressed air, nearly achieving isothermal compression, while also reducing pressure loss between stages, thus improving overall compression efficiency.
9) Minimized Internal Leakage:Adopting two-stage compression reduces the compression ratio for each stage, thereby minimizing internal leakage from high-pressure to low-pressure ends and enhancing volumetric efficiency.
10) Superior Noise Reduction:The two-stage compression method significantly lowers the compression ratio, resulting in a notable reduction in noise levels, especially the unloading noise.
11) Simplified Maintenance and Service:Apart from the screw air end, the two-stage compressor unit's systems and structures are largely similar to those of single-stage compressors, providing users with greater ease of maintenance and service.
1. Unbeatable Price Advantage
We offer our customers factory-direct prices, ensuring you stay ahead of the competition.
2. Seamless Direct Transactions
All our products come straight from the factory, allowing us to provide you with the most cost-effective options.
3. Tailor-Made OEM & ODM Services
Our robust production and management capabilities enable us to offer bespoke OEM/ODM services tailored to your needs.
4. Personalized Customization
We accept non-standard and export orders. Customizations in voltage, power, pressure, etc., are available to meet your specific demands. Contact us to discuss your requirements.
5. Small Orders Welcome
Start with a small trial order to evaluate the superior quality of our products.
6. Swift and Reliable Delivery
We ensure high-quality products are delivered to you promptly and efficiently.
7. Comprehensive Authorization
For our valued distributors, we provide full authorization certificates, empowering you to sell our SANZHI brand products confidently.
Successful Cases
Sanzhi (Henan) Compressor Co., Ltd, a renowned leader in the manufacturing industry, excels in producing top-tier screw air compressors and vacuum pumps. With over a decade of unwavering commitment, we offer an extensive range of products including 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. Our offerings also include single and double-tank configurations available in both electric and diesel options, alongside innovative screw vacuum pumps.
Our production processes are a paragon of efficiency and modernity, featuring state-of-the-art multi-air compressor assembly lines. Staffed by a team of over 50 proficient employees, we continually enhance our ERP-based management systems, significantly reducing lead times and ensuring the prompt delivery of superior quality products.
Adhering to stringent standards, our factory proudly holds ISO9001 certification, underscoring our commitment to exceptional quality management. We meticulously enforce rigorous quality control measures, ensuring each machine undergoes comprehensive material inspections, production evaluations, and thorough pre-delivery checks before leaving our facility.
Our customer service ethos is second to none. Our pre-sales team offers expert advice to help you select the perfect 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, comprised of seasoned professionals, ensures rapid and effective responses to all customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are dedicated to delivering high-performance, reliable products that foster long-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, with over a decade of professional experience.
Q2. How do you control quality?
A: 1. Stringent 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 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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