The three -screw pump is a rotor -type volume pump. It uses the screw meshing principle and relies on rotating screws to mesh in the pump cover.

It is mainly composed of a band (pump cylinder) fixed in the pump body and the active screws inserted in the pump cylinder and the two motion screws that are blends from it. The three -rooted screws are formed by each guide in the pump cylinder as a sealing cavity, causing sealing between the absorbing mouth.

The three screw pumps closed the transported medium in the meshing cavity, pushed continuously along the axial direction of the screw to the outlet to provide stable pressure for the system. At the time of work, the pressure of the liquid at both ends, respectively, and axial thrust on the screw. In addition, the high -pressure oil was introduced into the bottom of the screw shaft cover through the central oil hole of the active screw, which will generate a balanced thrust that is opposite to the axial thrust in the lower end of the screw. Therefore, for small pumps with a pressure difference of less than 10 kg/CM2, the bearing can be used.

Due to the symmetrical meshing of the two -clarous screw and the left and right left and right of the active screw, the radial force of the three screw pumps on the active screw is completely balanced, and the active screw does not bear the bending load. The radial force of the dynamic screw is supported by the entire length of the pump cylinder, and there is no need to set the bearing at the outer end. Basically, the curved load is not affected. During the operation, a layer of oil film formed between the surface of the screw outer circle and the inner wall of the pump cylinder can prevent direct contact between metal and greatly reduce the wear of the screw tooth surface.

The three screw pumps are the same as other volume pumps. When the outlet of the pump is completely closed, the pressure in the pump will rise to the risk of damaging the pump or the overload of the motor overload. Therefore, at the pump's suction port, the safety valve must be set. A shaft seal usually uses a mechanical shaft, and can be adopted according to the pressure of the work pressure.

The significant feature of the three screw pumps is that the structure is simple, the pressure pulse is small, the flow is stable, the work is stable and reliable, the high speed, the low noise, the high efficiency, the long life, and the self -priming ability. According to the needs of the delivery medium, the screw pump device can provide heating or cooling structure. It is suitable for transporting various non -corrosive oils and similar oils and lubricating liquids. The viscosity range of the transport liquid is generally 3.0 ~ 760mm2/s (1.2 ~ 100 ° E). The high viscosity medium can be transported after heating and adhesion. The temperature generally does not exceed 150 ° C. Its flow range is generally 0.2 ~ 250m3/h, and the highest working pressure can reach 4MPa.