The role of the pump body
The casing of the pump (that is, the pump body and the pump cover) constitutes the working chamber of the pump. The impeller, shaft and rolling bearing are the rotors of the pump. The suspension bearing part supports the rotor part of the pump, and the rolling bearing is subjected to the radial force and axial force of the pump. In order to balance the axial force of the pump, sealing rings are provided at the front and rear of the impeller of most pumps, and a balance hole is provided on the rear cover of the impeller.
The axial sealing ring of the pump is composed of packing gland, packing ring and packing to prevent air intake or large water leakage. If the impeller of the pump is balanced, the cavity filled with soft packing communicates with the suction port of the impeller. If the liquid at the impeller inlet is in a vacuum state, it is easy to enter the air along the surface of the shaft sleeve, so a packing ring is installed in the packing cavity to pass through. The small hole on the pump cover guides the pressure water in the pump chamber to the packing ring for sealing. If the impeller of the pump has no balance hole, since the liquid pressure on the back of the impeller is greater than the atmospheric pressure, there is no air leakage problem, so the packing ring may not be installed. In order to avoid shaft wear, a shaft sleeve is installed where the shaft passes through the stuffing chamber for protection. There is an O-ring seal between the sleeve and the shaft to prevent air intake or water leakage along the mating surface.
The transmission mode of the pump is connected with the electric motor through the lengthened elastic coupling, and the rotation direction of the pump, viewed from the driving end, is clockwise.
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