The unloading and anti-friction structure design of the vane compressor is to reduce the mechanical friction between the vane and the cylinder, and improve the operating efficiency and service life of the equipment. The following are some key unloading and anti-friction structures:

1.Unloading ring: Unloading rings that can rotate freely are arranged at both ends of the cylinder. The inner diameter of the unloading ring is slightly smaller than the inner diameter of the cylinder. When the vane is thrown out by the centrifugal force, it is close to the inner wall of the unloading ring. The unloading ring bears the centrifugal force of the vane, avoiding the contact between the vane and the cylinder wall, thereby reducing wear. Although the specific pressure of the vane on the unloading ring is relatively large, the relative movement speed between the vane and the unloading ring is very low because the unloading ring can rotate, so the mechanical friction loss and wear are reduced accordingly.

2.External unloading structure: The unloading ring can also be placed on the axial length of both ends outside the effective length of the cylinder to form an external unloading structure. This structure has better unloading and wear reduction effects, but it may make the shape of the slide more complicated and the protruding parts at both ends difficult to process.

3.Sliding vane material and lubrication method: The material of the sliding vane is usually selected according to the lubrication method. For example, steel sliding vanes are suitable for drip lubrication, while phenolic resin fiber laminates or alloy cast iron and aluminum alloy sliding vanes are suitable for oil injection lubrication. Self-lubricating materials such as filled graphite and filled organic synthetic materials are suitable for oil-free lubricated sliding vane air compressors.

4.Matching of cylinder and slide: The inner circle of the cylinder and the wall of the end cover should have low roughness and high hardness, and are often nitrided or chrome-plated to reduce the friction between the slide and the cylinder and improve wear resistance.

Through these structural designs, the vane compressor can achieve an efficient compression process while reducing energy loss and equipment wear due to friction.