The shaft sleeve of the screw machine rotor is the core protective component of the screw compressor/screw pump shaft system, directly inserted between the rotor shaft and the bearing seat. Its core characteristics revolve around "high-precision fit, strong working condition tolerance, and long life stable operation" design, and it is a key component to ensure the high-speed and smooth operation of the rotor.

🔍 Core Precision Characteristics

Ultra high Fit Accuracy: The inner diameter tolerance is strictly controlled at H7/H8 level, and the form and position tolerance accuracy can reach micrometer level. It achieves precise fit with the rotor shaft without clearance, completely avoiding radial/axial offset during rotor operation, ensuring that the clearance between the male and female rotors is always stable in the design range, and preventing rotor sweeping and rubbing.

Extremely high coaxiality: After overall processing, the overall runout deviation is controlled within 0.01mm, reducing vibration and noise during high-speed operation from the root and greatly improving the overall running stability of the machine.

.

🛡️ Material and working condition tolerance characteristics

Super wear resistance: High chromium alloys, tungsten alloys, or tin bronze materials are commonly used, with a surface hardness of HRC55 or above. The wear rate is extremely low under high-speed sliding friction conditions, and the service life is 3-5 times that of ordinary steel sleeves, avoiding rapid wear and failure of the shaft sleeve and rotor locking. Excellent corrosion resistance: Models suitable for special working conditions will use stainless steel or duplex steel materials, which can withstand long-term immersion in refrigerants, oil and gas, and weakly corrosive media without corrosion or pitting problems. They are suitable for special screw machine scenarios such as chemical and oil and gas transportation. Anti impact and anti vibration: The special structural design can absorb the impact load during rotor operation, buffer vibration transmission, avoid direct alternating stress on the shaft shoulder, protect the rotor shaft from wear and deformation, and greatly reduce the risk of fatigue fracture of the shaft system.

⚙️ Operating Features: Self lubricating and Low Friction: Some high-end shaft sleeves are embedded with solid lubricants or have precise oil grooves, which can quickly form a uniform oil film on the friction surface during operation, greatly reducing friction power consumption. Even if there is a short-term lack of oil, it will not directly cause dry wear and lock up, improving equipment fault tolerance.

Auxiliary sealing protection: The end face of the shaft sleeve is precisely attached to the sealing element, which can prevent external dust and impurities from entering the bearing chamber, while preventing internal lubricating oil from leaking out, ensuring a long-term clean and stable lubrication environment for the shaft system.

. Easy to replace and reduce maintenance costs: As a vulnerable part, the shaft sleeve can be replaced separately without the need to scrap the expensive rotor spindle as a whole, greatly reducing equipment maintenance costs. 35% of unplanned shutdowns of screw machines can be effectively avoided by replacing the shaft sleeve in advance.

📌 Adaptation and selection characteristics: Strong compatibility, customizable according to the shaft diameter, load, and speed of different models. From small air compressors to large industrial screw refrigeration compressors, corresponding shaft sleeve parameters can be matched to meet the working conditions of the entire series of screw machines.

For high-pressure heavy-duty models, the load-bearing capacity can be improved by thickening the wall thickness of the shaft sleeve, which can easily withstand the radial and axial unbalanced forces during rotor operation, ensuring long-term stable operation at full load of the equipment.

.