Novel vertical multistage pump

Abstract

The invention discloses a novel vertical multistage pump. The novel vertical multistage pump comprises a pump body shell; a pump shaft is mounted in the pump body shell, and is provided with multiple impellers; a half-integrated mechanical seal is mounted on the pump shaft at the tops of the impellers, and includes a machine seal shaft sleeve; the machine seal shaft sleeve is provided with a clamping groove; a movable ring is embedded in the clamping groove; the machine seal shaft sleeve is coated with a static ring base on the outer peripheral surface on the movable ring, and is provided with a groove in the bottom; a static ring is tightly matched and embedded in the groove, and is tightly bonded with a friction surface of the movable ring; two steps are arranged on the outer peripheral surface of the static ring base, and are respectively a large step and a small step; the large step is connected with a machine seal gland through multiple small springs; meanwhile, the small step is sealed with the machine seal gland through a sealing ring; a high-pressure cavity is betwen the outer side of the half-integrated mechanical seal and the inner wall surface of the pump body shell; an input port is in the lower part of one end of the pump body shell; and an output port is in the upper part of one end of the pump body shell, and is communicated with an outlet of the final-stage impeller. The novel vertical multistage pump is excellent in reliability and long in service life.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a novel vertical multistage pump. Background technique [0002] The vertical multistage pump is a kind of power equipment that greatly improves the energy of the liquid, and its working pressure is relatively high. The structure of the vertical multistage pump in the prior art is: a casing, and a pump shaft is installed in the casing. An impeller is installed on the pump shaft, and a balance drum or a balance disc is installed on the pump shaft at the top of the impeller, and the top of the balance drum or balance disc is sealed by a shaft seal; the inlet pressure of each impeller is lower than the outlet pressure, and the balance drum position, the pressure of the lower part is greater than the pressure of the upper part, and the balance drum or balance plate balances the axial force of the part. Since the balance drum or balance plate releases pressure through the gap, the ...

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Problems solved by technology

[0002] The vertical multistage pump is a kind of power equipment that greatly improves the energy of the liquid, and its working pressure is relatively high. The structure of the vertical multistage pump in the prior art is: a casing, and a pump shaft is installed in the casing. An impeller is installed on the pump shaft, and a balance drum or a balance disc is installed on the pump shaft at the top of the impeller, and the top of the balance drum or balance disc is sealed by a shaft seal; the inlet pressure of each impeller is lower than the outlet pressure, and the balance drum position, the pressure of the lower part is greater than the pressure of the upper part, and the balance drum or balance plate balances the axial force of the part. Since the balance drum or balance plate releases pressure through the gap, the balance chamber communicates with the low-pressure chamber of the water inlet chamber, and the leakage is serious. For small flow and high The effect of the efficiency reduction of head multi-stage pumps is particularly obvious

[0003] For vertical multistage pumps with small flow rate and high head, the pressure behind the last stage impeller is very high. If measures to balance the axial force are not taken, it will cause a lot of load pressure on the bearings, which is not conducive to the normal operation of the pump. The traditional design generally adopts the above-mentioned The balance drum or balance disc structure can balance part of the axial force, but the leakage is large, which reduces the pump efficiency a lot

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