First, the pump shaft is supported by a single row of radial ball bearings. Smooth oil can be used for the bearing - the oil volume is controlled between the markings of the oil marker post; Can also be used smooth grease smooth - can participate in the assembly of the pump. During operation, the front cover and rear cover are disassembled to supplement; The screw plug at the upper end of the pump body is used for filling and water diversion or connecting the air extraction and water diversion of the vacuum pump.
Secondly, the diesel engine mixed flow pump is mainly composed of pump cover, impeller, packing chamber, pump body, pump shaft, shaft sleeve, bearing body (diameter ≤ 350mm) or bearing frame (diameter ≥ 400mm) and other main parts. The shaft sleeve is used to maintain the pump shaft. It can be changed in time after wear.
The third is that the pump cover is respectively connected with the pump body and the water inlet pipe. There shall be proper clearance between the plane of the pump cover and the plane of the impeller. If the clearance is too small, friction will occur; If the clearance is too large, a large amount of pressure water in the pump body will return, which will reduce the efficiency of the pump. In practice, the suitable clearance is 0.3 ~ 0.7mm (push the pump shaft to the inlet end of the pump), and the clearance can be adjusted by increasing or decreasing the thickness of the paper pad.
Finally, in order to expand the application scope of the pump and meet the different requirements of users, the outer diameter of the impeller can be cut or the impeller with different performance can be replaced. The installation of shaft seal is composed of packing, packing gland, packing ring and stuffing box on the pump body. Its function is to prevent air from being sucked into the pump and water from flowing out too much along the shaft.