Application of Hydrodynamic Seal Technology of Heat Pump Deputy Impeller

Application of hydrodynamic seal technology of hot oil pump deputy impeller The so-called vice impeller hydrodynamic seal is to install an open impeller in the opposite direction to the coaxial direction near the back of pump impeller back cover. When the pump is working, the auxiliary impeller rotates with the pump main shaft, and the liquid in the auxiliary impeller will also rotate together. The rotating liquid will generate an outward centrifugal force that on the one hand withstands the liquid flowing to the mechanical seal and lowers the mechanical Sealing pressure. On the other hand prevent the solid particles in the medium from entering the friction pair of the mechanical seal, reduce the abrasion of the mechanical seal and prolong the service life of the mechanical seal. In addition to sealing the secondary impeller play a role, but also can play a role in reducing the axial force in the submersible sewage pump axial force is mainly caused by the liquid pressure on the impeller pressure force and the entire rotating part of the composition of gravity, which The direction of action of the two forces is the same, the resultant force is formed by the sum of two forces. It can be seen that in the case of identical performance parameters, the axial force of the submersible sewage pump is larger than that of the horizontal ones, and the balance is more difficult than the vertical ones. Therefore, in the submersible sewage pump, the bearing is easy to damage the reason is also a great relationship with the axial force. If the deputy impeller is installed, the direction of the liquid pressure exerted on the impeller is opposite to the resultant force of the above two forces, so that a part of the axial force can be canceled and the bearing life extended. However, there is also a disadvantage of using an aero-impeller seal system that consumes about 3% of the energy on the aero-impeller, but as long as the design is reasonable, this loss can be reduced to a minimum. Features of the seal structure of hot oil pump Note: The pump is a high temperature pump, if used, please read the instructions carefully. (1) double-end machine seal: the use of circular washing, plus external cooling, life is single 1.5-2 times. (2) metal bellows machine seal: compact structure, easy installation, in the case of the same auxiliary system, life expectancy of 2 to 3 times the normal seal. (3) The choice of hard and soft friction pairs (YG6 / YG8, SiC / SiC, etc.), for the high viscosity, with a small amount of solid particles of media or crystallization of media, with good results. (4) single-end seal: The use of injection flushing, flushing fluid is about 100 ℃ minus second-line wax, the pressure higher than the sealed cavity 0.05 ~ 0.15Mpa. Gattern outside with hot water (soft water) for rapid cooling. Generally can use a cycle (ten months).