Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission equals the sum of the power required for multi-stage compression. However, in real-world scenarios, the actual working power is higher due to factors such as coupling transmission power loss, bearing friction coefficients, and the cooling effect of liquid viscosity. To minimize these energy losses, reducing the compression ratio at each stage results in the total power required for multi-stage compression being less than that of single-stage compression.
The two-stage screw air compressor features a sophisticated design composed of a dual rotary screw compressor system. Each stage comprises an active screw and a passive screw; the active screw drives the passive screw through an external power transmission mechanism. In the first stage, low-pressure rate screw groups are utilized, while the second stage employs high-pressure rate screw groups. Surrounding each screw is a sealing air film which facilitates the compression of gas through three critical processes: suction, pressurization, and exhaust.
First Stage Compression: The initial stage employs a low-pressure rate screw group that compresses the gas as it enters the screw compression chamber through the suction valve. Under the high-speed rotation of the screw rotor, the gas is progressively compressed and then transferred to the subsequent stage.
Second Stage Compression: In the second stage, the gas is admitted into a tighter screw space where it undergoes further compression at higher temperatures and pressures. The exhaust valve opens to expel the high-pressure gases from the system, completing the compression cycle.
Operational Excellence: Natural air is first filtered and then enters the initial compression stage where it mixes with a small amount of lubricating oil. This mixture is compressed to the interstage pressure. The compressed gas then flows through a cooling channel, encountering a substantial oil mist that significantly reduces its temperature. Once cooled, the gas moves into the second-stage rotor for additional compression, achieving the final exhaust pressure. The entire process culminates as the fully compressed gas is discharged through the exhaust valve.
Water-cooled compressors harness the power of water as the cooling medium. As cooling water circulates within the air compressor, it serves a dual purpose: cleaning and lubrication, thus extending the lifespan of friction-wearing parts. During compressor operation, this cooling water absorbs heat from both the cylinder and the compressed gas, significantly reducing exhaust temperature and power consumption, leading to lower operating costs. However, careful attention must be given to prevent scaling within the water cooling system.
1) High Efficiency of PM Motor:Boasting a wide constant torque range and expanded weak magnetic range, the efficiency of the permanent magnet motor surpasses that of regular motors by 20-30%. Remarkably, even when operating away from the rated frequency, the permanent magnet motor maintains its outstanding efficiency, ensuring persistent high performance.
2) Maintenance-Free Motor:The permanent magnet motor is devoid of bearings, eliminating the need for costly motor bearing maintenance and replacement.
3) Integrated Frequency Converter: Equipped with China's premier frequency system, it offers a wide range of speed regulation and high precision. This allows for frequency modulation operation based on the user's actual gas demand, resulting in remarkable energy-saving effects.
4) No Transmission Loss: The compressor features an embedded integrated shaft directly connected to the permanent magnet motor, creating a more compact structure. Absence of coupling and other transmission parts results in 100% transmission efficiency.
5) Variable Frequency Start and Soft Start:This technology significantly mitigates the impact on power grid equipment, preventing damage to electrical components.
6) Reduced Energy Consumption: With a frequency conversion range of 25% to 100% (compared to ordinary frequency conversion of 50% to 100%), this system delivers energy savings exceeding 30% compared to fixed-speed air compressors, and approximately 5% compared to standard variable frequency air compressors. The greater the fluctuation in system gas consumption, the more pronounced the energy-saving effect.
7) Unique Two-Stage Compression Air End:The two-stage compression screw machine's air end is ingeniously designed, integrating the first-stage and second-stage compression rotors within a single casing. These rotors are driven directly through gears, optimizing linear speed for each rotor and enhancing overall compression efficiency.
8) Internal Spray Curtain Cooling Method: Utilizing a high energy-saving internal spray curtain cooling technique, this method offers superior cooling effects, dramatically lowering the temperature of compressed air to near isothermal compression levels. Additionally, it minimizes pressure loss between stages, reduces the compression ratio, and boosts compression efficiency.
9) Reduced Internal Leakage:Adopting two-stage compression reduces the compression ratio for each stage, minimizing internal leakage from the high-pressure end to the low-pressure end, thus improving volumetric efficiency.
10) Noise Reduction:Two-stage compression not only lowers the compression ratio but also significantly diminishes noise levels, with substantial reductions in unloading noise.
11) Easy Maintenance and Service:Besides the screw air end, the two-stage compressor unit shares similar systems and structures with single-stage compressors, facilitating user maintenance and service.
Packaging & Shipping
Our Advantages
1. Competitive Pricing
We offer direct ex-factory prices to our customers, empowering them to stay ahead of the competition with more attractive pricing.
2. Direct Transactions
Our products are supplied straight from the factory, ensuring that you receive cost-effective solutions without any intermediaries.
3. Comprehensive OEM & ODM Services
Leveraging our factory's robust production and management capabilities, we provide extensive OEM/ODM services tailored to your needs.
4. Customization Options
We welcome non-standard, export, and tailored orders to meet your specific voltage/power/pressure requirements. Contact us to discuss your customization needs.
5. Small Order Acceptance
Feel free to place a small trial order to evaluate the superior quality of our products.
6. Rapid Delivery
Benefit from our high-quality products with prompt and timely delivery to meet your demands.
7. Full Authorization
Distributors receive comprehensive authorization certificates, empowering you to market and sell our prestigious SANZHI brand products with confidence.
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Company Profile
Sanzhi (Henan) Compressor Co., Ltd. is a distinguished manufacturer specializing in screw air compressors and vacuum pumps, boasting over a decade of industry expertise. Our expansive product lineup features normal pressure and low-pressure screw air compressors, permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, versatile single-tank and double-tank mobile screw compressors, electric and diesel mobile screw compressors, and advanced screw vacuum pumps.
Our production capabilities are unparalleled, utilizing state-of-the-art multi-air compressor assembly lines that ensure lean, modern manufacturing processes. Driven by a dedicated team of over 50 employees, we continuously refine our management systems, including ERP, to reduce lead times and ensure the swift delivery of high-quality products.
In management, we proudly uphold the ISO9001 quality management system certification. Our commitment to stringent quality control is unwavering, with meticulous inspections at every stage-material, production, and pre-delivery-ensuring each machine meets our rigorous standards.
Our customer service is second to none. Pre-sales, we provide expert guidance to help customers select the perfect air equipment for their diverse needs, offering high levels of customization in appearance and configuration. We also excel in OEM production, crafting unique products to meet dealer specifications. Post-sales, our professional sales and service team stands ready to respond swiftly to any customer inquiries.
At Sanzhi (Henan) Compressor Co., Ltd., we are committed to delivering top-notch, reliable products and fostering long-term relationships with our clients. With our efficient delivery systems, high-quality machines, and competitive pricing, we are your trusted partner for premium compressed air solutions.
Our factory is conveniently situated in Xinzheng City, Henan Province, China. We are pleased to offer transportation from Xinzheng International Airport to our facility, located just 30 kilometers away, approximately a one-hour journey. We warmly welcome you to visit our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors, with more than 10 years of experience.
Q2. How do you control quality?
A: 1. The raw materials are strictly inspected.
2. Installation procedures are strictly controlled.
3. Each machine must pass at least 5 hours of continuous testing before leaving the factory.
Q3. What information must I provide to get the suitable machine?
1. How much air delivery capacity (Unit: CFM or m³/Min)
2. How much working pressure (Unit: PSI, Bar or Mpa)
3. What is the voltage and frequency of my country of residence (V/Hz)
4. Whether I need other accessories such as an air tank, filters, and/or air dryers.
Tell us the answer, we will offer a scheme 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 available voltage include 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, and can be customized according to your requirements.
Q6. How long is the delivery time?
A: For standard voltage,15 working days after the confirmed order. Non-standard, please contact our sales.
Q7. What's the payment term?
A: 30% T/T in advance, 40% T/T before shipment, and 30% T/T against the B/L copy. USD, RMB can be accepted.
Q8. How about your warranty?
A: One year for the whole machine and two years for screw air compressor, except for consumable spare parts.
Q9. What about the maintenance?
A: First maintenance needs to be done after 500 hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.
Q10. Can machines be run in high-temperature environment?
A: Yes, machines would run in high-temperature environment countries. Working temperature from -20° to 45°(-4ºF-113ºF).
Q11. Do you offer OEM service?
A: Yes, with a professional design team, both OEM & ODM orders are highly welcome.
Q12. How long could your air compressor be used?
A: Generally, more than 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, of course.
Q14. How about your after-sales service?
A: Provide customers with installation and commissioning online instructions, and arrange for our engineers to help you with training and installation.
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