Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission is equal to the combined power for multi-stage compression. However, in reality, actual working power increases due to factors like coupling power loss, bearing friction, and the cooling effect of liquid viscosity. By reducing the compression ratio at each stage, the total power needed for multi-stage compression becomes less than that required for single-stage compression, effectively cutting down unnecessary power consumption.
The two-stage screw air compressor incorporates a sophisticated two-stage rotary screw mechanism. Each stage consists of an active and a passive screw, where the active screw propels the passive screw using an external power transmission device. The first stage employs a low-pressure screw group, while the second stage features a high-pressure screw group. Surrounding each screw is a sealing air film. As the screws rotate, gas undergoes suction, pressurization, and exhaust processes, resulting in efficient compression.
First Stage Compression: The initial stage of the two-stage screw air compressor utilizes a low-pressure screw group to compress the gas between the screws. Gas enters the screw compression chamber via the suction valve. As the screw rotor rotates at high speed, the gas is gradually compressed and subsequently transferred to the second stage.
Second Stage Compression: In the second-stage screw group, the gas enters a more confined screw space, where it undergoes further compression at higher temperatures and pressures. The exhaust valve then opens, expelling the high-pressure gas from the system.
Natural air is drawn into the first stage of compression 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 moves through a cooling channel, encountering a significant amount of oil mist, which substantially lowers its temperature. The cooled, compressed gas then enters the second-stage rotor, undergoes further compression to the final exhaust pressure, and is finally discharged through the exhaust valve, completing the entire compression cycle.
Water-cooled compressors leverage water as the cooling medium to deliver numerous benefits. As cooling water circulates through the air compressor, it not only purifies but also enhances lubrication, consequently extending the lifespan of friction-wearing components. During operation, cooling water absorbs heat from the cylinder and compressed gas, effectively reducing exhaust temperature and power consumption, which lowers operating costs. However, it's essential to monitor and manage potential scaling issues within the water cooling system.
1) Outstanding Efficiency of PM Motor:Boasting a broader constant torque and weak magnetic range, the permanent magnet motor operates with 20-30% greater efficiency compared to conventional motors. Even when operating away from the rated frequency, the efficiency remains consistently high, ensuring optimal performance.
2) Maintenance-Free Motor:The design of the permanent magnet motor eliminates internal bearings, thus cutting costs associated with bearing maintenance and replacement.
3) Integrated Frequency Converter:Utilizing China's top frequency system, the converter offers a wide speed regulation range and high precision. It adjusts operation based on actual gas demand, significantly boosting the air compressor's energy efficiency.
4) Zero Transmission Loss:Thanks to the integrated shaft design that directly connects 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 significantly 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 than fixed-speed models and about 5% more than conventional variable frequency compressors. Larger fluctuations in system gas consumption further enhance energy-saving effects.
7) Unique Two-Stage Compression Air End:The ingenious two-stage compression screw design incorporates both first-stage and second-stage rotors within a single case, driven directly by gears. This ensures optimal linear speed for each rotor stage, maximizing compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Employing an energy-efficient internal spray curtain cooling method, the system delivers superior cooling. This significantly lowers the temperature of compressed air, nearly achieving isothermal compression while reducing pressure loss between stages, thus improving overall compression efficiency.
9) Minimized Internal Leakage: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 during unloading.
11) Simplified Maintenance and Service:Apart from the screw air end, the systems and structures of the two-stage compressor unit are largely similar to those of single-stage compressors, offering easier maintenance and service for users.
1. Unbeatable Price Advantage
We provide our customers with factory-direct prices, ensuring you maintain a competitive edge in the market.
2. Seamless Direct Transactions
Our products are shipped directly from the factory, enabling us to offer you the most economical options available.
3. Tailor-Made OEM & ODM Services
With our robust production and management capabilities, we offer bespoke OEM/ODM services meticulously designed to meet your unique requirements.
4. Personalized Customization
We accommodate non-standard and export orders, with customizable options in voltage, power, pressure, and more. Connect with us to discuss your exact requirements.
5. Small Orders Welcome
Start with a small trial order to assess the exceptional quality of our products.
6. Swift and Reliable Delivery
We guarantee that our 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 SANZHI brand products with confidence.
Successful Cases
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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