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 needed for multi-stage compression. However, in reality, this process encounters increased working power due to transmission power loss, bearing friction, and liquid viscosity cooling effects. By reducing the compression ratio at each stage, unnecessary power consumption can be minimized, making the total power for multi-stage compression less than that of single-stage compression.
The two-stage screw air compressor features a two-stage rotary screw system, each comprising an active and a passive screw. The active screw drives the passive screw via an external power transmission device. In this system, the first stage involves a low-pressure rate screw group, while the second stage operates at a high-pressure rate. Each screw is surrounded by a sealing air film. During rotation, gas undergoes a three-step process of suction, pressurization, and exhaust.
First Stage Compression: The first stage of the two-stage screw air compressor utilizes a low-pressure rate screw group. Gas is drawn into the compression chamber through the suction valve and is squeezed progressively by the high-speed rotating screw rotor, readying it for the second stage.
Second Stage Compression: In the second stage screw group, gas is further compressed in an even tighter screw space at higher temperature and pressure. The exhaust valve then opens to release the high-pressure gas from the system.
Natural air enters the first stage of compression via an air filter, mixing with a small amount of lubricating oil in the compression chamber. This mixed gas is compressed to interstage pressure, then enters the cooling channel where it encounters a substantial amount of oil mist, significantly lowering its temperature. The cooled gas proceeds to the second-stage rotor, undergoing final compression before being discharged through the exhaust valve, completing the entire compression cycle.
Water-cooled compressors harness the power of water as a cooling medium. By allowing cooling water to flow inside the air compressor, it not only performs a vital cleaning role but also enhances lubrication, thereby extending the lifespan of friction-wearing parts. During operation, the cooling water effectively removes heat from the cylinder and the compressed gas, significantly lowering exhaust temperatures and power consumption, which in turn reduces the operating costs of the air compressor. However, users must be vigilant about the potential scaling issues in the water cooling system.
1) High Efficiency of PM Motor: The permanent magnet (PM) motor boasts a broader constant torque range and a wider weak magnetic range. Its efficiency surpasses that of regular motors by an impressive 20-30%. Even when operating away from its rated frequency, the PM motor maintains its exceptional efficiency, ensuring high-performance levels at all times.
2) Maintenance-Free Motor:The PM motor is designed without internal bearings, eliminating the need for bearing maintenance and replacement costs.
3) Integrated Frequency Converter:Equipped with China's top frequency system, this feature offers an extensive range of speed regulation and high precision. It adjusts according to the user's actual gas demand, resulting in remarkable energy-saving benefits for the air compressor.
4) No Transmission Loss:The PM motor and compressor are seamlessly integrated using an embedded, direct-connected shaft structure. This compact design eliminates the need for couplings and other transmission parts, ensuring 100% transmission efficiency.
5) Variable Frequency Start and Soft Start:This technology significantly reduces the impact on power grid equipment, preventing damage to electrical systems.
6) Reduced Energy Consumption:With a frequency conversion range from 25% to 100% (compared to the ordinary range of 50% to 100%), this system offers energy savings of over 30% compared to fixed-speed air compressors and approximately 5% more than ordinary variable frequency air compressors. The more fluctuating the system's gas consumption, the greater the energy-saving effect.
7) Unique Two-Stage Compression Air End:This innovative design incorporates the first-stage and second-stage compression rotors within a single casing, each driven by gears to achieve optimal linear speed. This results in higher compression efficiency.
8) Internal Spray Curtain Cooling Method:This high energy-saving method delivers excellent cooling performance, significantly reducing the temperature of compressed air. It achieves near-isothermal compression, lowers pressure loss between stages, reduces the compression ratio, and enhances compression efficiency.
9) Reduced Internal Leakage:By adopting two-stage compression, the compression ratio is lowered for each stage, reducing internal leakage from high to low pressure and improving volumetric efficiency.
10) Noise Reduction:The two-stage compression system lowers the compression ratio, thereby significantly reducing noise levels, particularly during unloading.
11) Easy Maintenance and Service:Despite its advanced two-stage compression design, the unit's other systems and structures remain similar to single-stage compressors, ensuring ease of maintenance and user convenience.
1. Unbeatable Price Advantage
By offering direct ex-factory prices, we empower our customers to stay more competitive in the market.
2. Direct Transactions
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 offer top-tier OEM/ODM services tailored to your needs.
4. Tailored Customization
We welcome non-standard orders, export orders, and specific customization in voltage, power, pressure, etc. Reach out to us with your requirements.
5. Small Order Acceptance
Initiate with a small trial order to assess the exceptional quality of our products.
6. Swift Delivery
Experience the perfect blend of high-quality products and prompt delivery.
7. Comprehensive Authorization
We provide full authorization certificates for distributors to sell our prestigious SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd is a distinguished manufacturer specializing in the production of premium screw air compressors and screw vacuum pumps, boasting over a decade of industry expertise. Our extensive product lineup encompasses normal pressure and low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors tailored 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, and screw vacuum pumps, among others.
In production, we achieve unparalleled efficiency through the deployment of modern, lean multi-air compressor assembly lines. Supported by a dedicated workforce of over 50 employees, we continuously optimize our management systems, including ERP, to minimize lead times and ensure the swift delivery of high-quality products.
In management, our factory has earned the prestigious ISO9001 quality management system certification. We strictly adhere to rigorous quality control processes, ensuring that each machine undergoes thorough material inspection, production inspection, and pre-delivery assessment, consistently meeting the highest standards.
In customer service, we excel in both pre-sales and after-sales support. Pre-sales, our experts guide customers in selecting the ideal air equipment for various facilities, offering high customization options in appearance and configuration, as well as OEM solutions to meet specific dealer requirements. For after-sales, we have a professional sales and service team ready to provide prompt responses and support.
At Sanzhi (Henan) Compressor Co., Ltd, our commitment is to deliver superior and stable products, fostering long-term relationships with our customers. With efficient delivery, high-quality machines, and competitive pricing, we are your reliable partner for all your compressed air solutions.
Our factory is conveniently located in Xinzheng City, Henan Province, China. We offer complimentary transportation from Xinzheng International Airport to our facility, a short 30-kilometer journey that takes approximately one hour. We warmly welcome you to visit our company!
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. Strict raw material inspection.
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 standard voltage specifications, our lead time is typically 15 working days following order confirmation. If custom non-standard voltage specifications are necessary, please reach out to our sales team for precise delivery timelines.
Q7. What's the payment term?
A: Our payment terms are carefully structured to ensure smooth transactions: an initial 30% T/T deposit in advance, followed by 40% T/T before shipment, and the remaining 30% T/T upon receipt of the B/L copy. We accept payments in both USD and RMB.
Q8. How about your warranty?
A: We offer an extensive warranty program: one year for the entire machine and an impressive two years for the screw air compressor, with the exclusion of consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be performed after 500 operating hours. Subsequent maintenance intervals are recommended between 2000-3000 hours, depending on specific working conditions.
Q10. Can machines be run in high-temperature environments?
A: Absolutely, our machines are meticulously engineered to perform efficiently in high-temperature environments, operating flawlessly within a temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we provide both OEM and ODM services. Our expert design team ensures maximum flexibility to meet your specific requirements.
Q12. How long could your air compressor be used?
A: Our air compressors are masterfully built for durability, boasting a typical lifespan that exceeds 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we guarantee the availability of essential spare parts for all our machines.
Q14. How about your after-sales service?
A: We offer robust after-sales support, including online guidance for installation and commissioning. Additionally, we can dispatch skilled engineers for on-site training and installation assistance.
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