There is a rotation joint at the joint between the outer circle of AF foam pump impeller suction and the inner wall of the pump

There is a rotating joint between the outer circle of the impeller suction and the inner wall of the pump block, which is the interface between high and low pressure, and has a relatively moving part that is prone to leakage, as shown in Figure 2-4, Figure 12. In order to reduce the return flow of high-pressure water to the suction port inside the pump, two leakage reduction methods are generally adopted in the pump structure: ① reducing the leakage between joints (not exceeding 0.1-0.5m); ② Increase resistance in the leakage channel, etc. In practical applications, due to issues such as processing, installation, and axial force, it is easy to experience grinding between the impeller and pump at the joints. In order to extend the service life of the impeller and pump light, steel is usually applied to the pump light. A metal mouth ring can now be formed into a tooth shape between the ring joints. To increase muscle strength when water flows back. To enhance the beauty reduction of makeup, Le, and Guo, this mouth ring is commonly referred to as a leak reducing ring, as shown in Figure 2-11, which consists of three different forms of leak reducing rings.