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 for multi-stage compression. However, in real-world scenarios, the actual working power increases due to transmission power losses from the coupling, bearing friction, and the cooling effect of liquid viscosity. To minimize these losses, reducing the compression ratio of each stage ensures that the total power required for multi-stage compression is less than for single-stage compression.
The two-stage screw air compressor features a dual-stage rotary screw mechanism. Each stage consists of an active and a passive screw. The active screw, powered externally, drives the passive screw. The first stage uses a low-pressure screw group, while the second stage employs a high-pressure screw group. Sealing air films encircle each screw, and as they rotate, the gas undergoes three processes: suction, pressurization, and exhaust.
First stage compression: The first stage utilizes a low-pressure screw group to compress the gas. Gas enters the screw compression chamber via the suction valve. As the screw rotor rotates at high speed, the gas is squeezed out and moves to the second stage.
Second stage compression: In the second stage, the gas enters a tighter screw space, experiencing higher temperatures and pressures. The exhaust valve opens to release the high-pressure gas from the system.
Natural air passes through the air filter into the first stage, where it mixes with lubricating oil in the compression chamber and is compressed to interstage pressure. The compressed gas then moves through the cooling channel, encountering oil mist that significantly reduces its temperature. The cooled gas enters the second-stage rotor for further compression to the final exhaust pressure, and is ultimately discharged through the exhaust valve, completing the compression cycle.
Water-cooled compressors utilize water as the primary cooling medium, enhancing the overall performance and longevity of the system. The water circulates within the unit, effectively cleaning and lubricating, which significantly extends the life of frictional parts. As the compressor operates, the cooling water absorbs heat from the cylinder and compressed gas, thereby reducing both the exhaust temperature and power consumption. This process leads to lower operational costs. However, it is crucial to manage and monitor potential scaling issues within the water cooling system to ensure optimal performance.
1) Superior Efficiency of PM Motor:The constant torque and weak magnetic ranges are notably broad, resulting in a permanent magnet motor that is 20-30% more efficient than standard motors. Even when operating away from the rated frequency, the efficiency remains consistently high, ensuring unparalleled motor performance.
2) Maintenance-Free Motor:Engineered without internal bearings, the permanent magnet motor eliminates the need for costly bearing maintenance and replacement.
3) Integrated Frequency Converter:Employing China's premier frequency system, it offers extensive speed modulation and precision. Tailored to the user's specific gas demands, this feature significantly enhances the air compressor's energy-saving capabilities.
4) Zero Transmission Loss:The integrated shaft directly connects the permanent magnet motor and compressor, resulting in a compact structure devoid of couplings and other transmission components, thereby achieving 100% transmission efficiency.
5) Variable Frequency Soft Start:This feature minimizes the impact on power grid equipment, preventing any potential damage to electrical components.
6) Reduced Energy Consumption:With a frequency conversion range spanning from 25% to 100% (compared to ordinary conversions of 50% to 100%), this system offers up to 30% more energy savings than fixed-speed compressors and about 5% more than standard variable frequency models. The greater the fluctuation in system gas consumption, the more pronounced the energy-saving effect.
7) Unique Two-Stage Compression Air End:The innovative two-stage compression screw design integrates the first and second stage rotors within a single casing, driven by gears to optimize linear speed at each stage, thereby enhancing compression efficiency.
8) Internal Spray Curtain Cooling:Utilizing an advanced internal spray curtain cooling method, this system delivers exceptional cooling results. It substantially lowers the temperature of compressed air, achieves near-isothermal compression, reduces pressure loss between stages, and enhances overall compression efficiency.
9) Minimized Internal Leakage:The two-stage compression design lowers the compression ratio for each stage, reducing internal leakage and improving volumetric efficiency.
10) Noise Reduction:This design also significantly lowers noise levels, particularly during unloading, thanks to the reduced compression ratio.
11) Easy Maintenance and Service:Despite the advanced two-stage compression unit, all other systems and structures remain consistent with single-stage compressors, ensuring ease of maintenance and user convenience.
1. Price Advantage
We offer customers direct ex-factory prices, enhancing their competitive edge in the market.
2. Direct Deal
All products are supplied directly from our factory, ensuring you receive the most cost-effective solutions.
3. OEM & ODM Services
Our factory's robust production and management capabilities enable us to provide comprehensive OEM/ODM services tailored to your needs.
4. Customized Service
We accept non-standard orders and export orders, with customizable voltage, power, pressure, etc. Contact us for bespoke solutions.
5. Accept Small Orders
Place a small trial order to evaluate the superior quality of our products.
6. Fast Delivery
We ensure timely delivery of premium-quality products.
7. Complete Authorization
For distributors, we provide full authorization certificates, empowering you to sell our SANZHI brand products confidently.
Sanzhi (Henan) Compressor Co., Ltd is a premier manufacturer specializing in the production of screw air compressors and screw vacuum pumps, with over a decade of industry expertise. Our extensive product range includes normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors for laser cutting, single-tank mobile screw air compressors, double-tank mobile screw air compressors, electric mobile screw air compressors, diesel mobile screw air compressors, screw vacuum pumps, and more.
Our production process is streamlined and highly efficient, thanks to our modern, lean multi-air compressor assembly lines. Supported by a dedicated team of over 50 employees, we continuously optimize management systems such as ERP to minimize lead times, ensuring the rapid delivery of high-quality products.
We have achieved ISO9001 quality management system certification, reflecting our commitment to stringent quality standards. Each machine undergoes rigorous material inspection, production inspection, and pre-delivery inspection, guaranteeing top-notch quality and reliability.
Our customer service is unparalleled. In pre-sales, we provide expert guidance to help customers select the perfect air equipment, offering high customization options for appearance and configuration. We also create unique, OEM products tailored to meet specific dealer demands. Our after-sales team, composed of seasoned sales and service professionals, ensures quick and efficient responses to any customer inquiries.
At Sanzhi (Henan) Compressor Co., Ltd, our mission is to deliver superior and reliable products while building long-term relationships with our clients. We pride ourselves on efficient delivery, high-quality machines, and competitive pricing, making us your trusted partner for all your compressed air solutions.
Our factory is conveniently located in Xinzheng City, Henan Province, China. We offer complimentary pick-up services from Xinzheng International Airport to our factory, a short 30-kilometer journey that takes about an hour. 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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