Advantages of DSR Compressor Rotors
- High compression ratio: Increased efficiency while strong rigidity balances the compressed air generated by the rotor.
- High durability: Excellent corrosion and wear resistance, capable of operating in a variety of extreme environments.
- Strict sealing: High-precision manufacturing and assembly processes effectively prevent leakage and the escape of high-pressure gas.
- High geometric accuracy: Control errors are within ±5µm, and clearances can be as small as 12µm, minimizing leakage losses and improving exhaust efficiency.
Leading Compressor Rotor Supplier in China
Compressor rotors are key rotating components in compressors, driven at high speed by an electric motor to perform the tasks of sucking in and compressing gas. And we can manufacture compressor rotors tailored to your specific needs, whether you’re in the aerospace, medical, refrigeration, energy and power, or other industries.
DSR has advanced, intelligent programming software, allows us to precisely define machine cycles by specifying the number of passes and relative feeds. It can also automatically build internal and external tapered screw profiles and execute the cycle with a single click. This allows us to flexibly fulfill your orders within a short timeframe.
Also, DSR’s CNC machines feature sturdy steel construction to effectively reduce vibration. They utilize CBN or ceramic grinding wheels, and multi-axis machines offer rapid tool changes. Integrated measurement technology allows for rapid response and adjustment of part profiles.
Because of these technologies, DSR can customize a variety of cost-effective compressor rotors for you. Contact us now for a quote, and we’ll offer wholesale pricing, with preferential pricing for larger quantities.
Different Types Of Compressor Rotors DSR Can Process For You
Composed of a pair of helical male and female rotors, meshing together to move air to the outlet compression zone.
Composed of intermeshing rotating profiles, they are suitable for specific positive displacement compression tasks.
With sliding vanes that slide along the rotor cavity, they achieve volume change and are suitable for compact designs.
Consists of a fixed and an eccentrically moving spiral, forming a sealed chamber between them to compress air. They are commonly used in air conditioners and medical equipment.
Similar to a tapered screw structure with gradually tapered corners, they reduce the leakage area and can achieve a high-pressure ratio single-stage compression. However, they are difficult to process and relatively expensive, and are still under development and optimization.
A high-speed rotating impeller converts the kinetic energy of the gas into pressure energy. They are often used in applications with high flow requirements.
Consists of multiple stages of rotating blades, with airflow passing along the axial direction. They are commonly used in gas turbines and aircraft engines.
Various materials suitable for compressor rotors
Ductile ironA common material for screw compressors, it offers excellent strength, wear resistance, and cost advantages after quenching or surface hardening.
Alloy steelUsed for repairing worn rotors and restoring precision through grinding after welding, suitable for high-load operating environments.
Aluminum alloy or ordinary steelUsed for manufacturing large, lightweight rotors, particularly in cost-sensitive or simple mechanical systems.
Titanium alloyCommonly used in aviation and turbocharger systems, it offers high specific strength, fatigue-resistant structures, and lightweight advantages.
Nickel-chromium alloy or high-temperature alloyUsed in centrifugal or high-temperature turbo compressors, it offers high-temperature resistance, oxidation resistance, and stable mechanical strength, making it suitable for extreme operating conditions.
Metal matrix compositesLightweight, wear-resistant, and fatigue-resistant, they are used for advanced compressor rotors needing high strength and durability.
RESOURCE
This document provides a basic overview of compressor rotor performance and functionality, along with the types of compressor rotor CNC machining services DSR offers. It also provides an overview of our machine tools and certifications.
Detailed pricing for various part machining services, including post-process finishing. Also includes various packaging and shipping options.
This video covers DSR’s compressor rotor production, inspection processes, and an introduction to our production floor and company departments.
Different CNC Machining Services We Can Provide
Five-axis or multi-axis generative milling: Used for machining screw, scroll, or complex impeller shapes. For example, the “side milling” method can achieve high-precision spiral surface machining.
Commonly used for rough machining of rotors or shaping of shaft components, as the basis of subsequent milling or grinding. Integrated machining with a milling-turning machine improves efficiency.
Contour finishing and surface dressing: Performed after rough milling, this process can achieve micron-level accuracy. DSR’s equipment supports closed-loop control, one-click grinding wheel dressing, and automatic deviation correction.
A common practice is to perform pre-forming by milling, followed by finishing by grinding. This way combines milling efficiency with grinding accuracy, and is a proven process for manufacturing screw or impeller rotors.
Wear detection and automatic grinding wheel dressing are integrated into the process, creating a closed-loop feedback loop. Our equipment automatically measures and adjusts during machining to raise precision.
Drilling, chamfering, grooving, etc.: to create mounting holes, oil guide grooves, or to reduce sharp edges. While not core processes, they are often combined with milling and grinding in conjunction.
Cutting Cooling Technology: Coolant is used to lower the temperature during cutting, effectively maintaining cutting accuracy.
Tooth profile and shape errors: In screw compressors, the rotor meshing relationship is extremely sensitive. Manufacturing errors will lead to misalignment, poor contact, and, in severe cases, rotor seizure.
Currently, advanced machines can achieve profile control accuracy of ±5µm; the clearance between rotors can be as small as 12µm. Over-tightening significantly increases the risk of rotor contact and locking.
Axis non-parallelism and misalignment: Bearing hole position deviations or machining errors can cause rotor axis distortion, resulting in offset or uneven clearance when the two rotors mesh. These geometric errors can cause friction, sticking, or even locking.
Rotor imbalance: Due to uneven texture or thermal deformation, centrifugal unbalanced forces can be generated at high rotor speeds, causing vibration and increased bearing loads. Then, this can lead to seizure and mechanical locking.
Although not a manufacturing error, chips and metal fragments in the rotor structure can clog the meshing area, directly blocking the rotation path and causing instantaneous locking.
Rotor: Driven by the compressor shaft, it usually carries blades or an impeller. Its primary function is to accelerate the gas and increase the fluid’s kinetic energy (dynamic pressure).
Stator: Positioned behind the rotor, it does not rotate and is typically composed of fixed blades. Its purpose is to convert the fluid’s energy into pressure and guide the airflow to the rotor stage. Its functions can be considered “diffusion” and “flow correction.”
In a typical axial-flow compressor, each stage consists of a combination of rotor blades and stator blades, forming a multi-stage compression structure. The rotor’s rotational acceleration, combined with the stator’s diffusion and conversion, gradually increases gas pressure and efficiency.
Ceramic coatings: Enhance corrosion resistance, improve surface finish, and restore the surface quality of worn parts.
PTFE and molybdenum disulfide coatings: Commonly used in oil-free screw compressors, they provide tightness, reduce friction, and reduce heat buildup.
Wear-resistant/lubricating chemical composite coatings: Improve surface roughness and coating uniformity, while meeting lightweight and wear-resistant requirements and enhancing reliability.
PTFE coatings: Improve performance, extend life, and enhance corrosion resistance.
Corrosion-resistant hard coatings: Operate in harsh environments, resist wear, and are easy to maintain.
Abrasive powder coatings: Widely used to control seal clearances in jet engine impellers.
Thermal spray technology: Improves rotor surface hardness and durability.
Anti-wear and chemical conversion coatings: Improve wear resistance and reduce sliding damage.
Thermal barrier coatings: Similar technologies can be used for thermal insulation or to increase fatigue life in high-temperature compression environments.
