DG boiler feed pump structure description: DG type boiler feed pump pump housing mainly by the bearing body, the front section, the middle section, the rear section, the guide vane and other bolts with the overall connection, the front suction inlet midline and horizontal, but also was Horizontal line. Spit out the middle of the latter vertical and horizontal, but also showed a horizontal line. Part of the rotor mainly by the shaft and mounted on the shaft of the impeller, bushings, balance plate and other components. The shaft parts are tightened with plain keys and sleeve nuts to make them integral with the shaft. The entire rotor is supported on both sides of the pump housing by the bearings on both sides. The impeller in the rotor section is based on the pump series. The rotor is driven by the motor, from the motor end, the pump rotates clockwise. DG type boiler feed pump using rolling bearings, according to different models, are not subject to axial force, the pump should be allowed to run in the pump rotor axial movement in the shell, can not use radial ball bearings. Bearings with calcium-based grease lubrication. Seal between the pump front section, middle section and rear section are sealed with molybdenum disulfide grease, and the sealing between the rotor part and the fixed part is by sealing ring, guide vane sleeve and packing. When the degree of wear of the sealing ring and guide vane sleeve Has affected the pump work and performance should be promptly replaced. DG-type boiler feed pump using packing seal or mechanical seal, the use of packing and mechanical seal position security should be correct, packing and mechanical seal tightness must be appropriate to the fluid can be a drop of exudation appropriate.
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