Lower support structure of long shaft pump

Abstract

The invention relates to a component structure of a long shaft pump, in particular to a lower support structure of a long shaft pump. The lower support structure of the long shaft pump comprises a pump body and an impeller arranged in the pump body, wherein a sliding bearing is arranged above an impeller shaft; the lower end of the impeller shaft is arranged on a bearing seat through a lower bearing, and the bearing seat is connected with the pump body through a section of barrel body; and a suction port which runs through inside and outside is arranged on the barrel wall of the barrel body. Compared with the traditional structure, the lower bearing device is additionally arranged, which makes the upper part and the lower part of the impeller obtain positioning support, ensures that the radial runout of the impeller is smaller in the running process and simultaneously reduces the axial force of the impeller in the running process, the abrasion of the sliding bearing and a shaft sleeve and the maintenance cost; meanwhile, the suction port setting requirement is solved by arranging the suction port on the barrel wall of the barrel body; the vortex phenomenon can be prevented by arranging a separating tongue so as to improve the anti-blocking performance of an inlet; and the inlet is in a negative pressure state in the running process of the pump, therefore, the impact to a lower bearing sealing device from liquid stream is reduced, and the sealing performance of a bearing body is improved.

Description

technical field [0001] The invention relates to a component structure of a long-axis pump, in particular to a lower support structure of a long-axis pump. Background technique [0002] Long shaft pumps are usually used in the occasions with deep submerged depth, large flow and high head, and are widely used in electric power, petrochemical, steel and other industries. The following problems exist in the operation of traditional long-axis pumps: when the depth of the liquid is large, the coaxiality of the long-axis pump operation cannot be guaranteed, and the dynamic balance is poor. Since the suction port is below the impeller, it is usually only provided with a slide above the impeller. Bearings and shaft sleeves cooperate with the support, and the wear is serious. The stability of the pump operation is poor after the matching gap is increased due to wear. The sliding bearings and shaft sleeves must be replaced frequently, which increases the cost of operation and maintenan...

AI Technical Summary

Problems solved by technology

The following problems exist in the operation of traditional long-axis pumps: when the depth of the liquid is large, the coaxiality of the long-axis pump operation cannot be guaranteed, and the dynamic balance is poor. Since the suction port is below the impeller, it is usually only provided with a slide above the impeller. Bearings and shaft sleeves cooperate with the support, and the wear is serious. The stability of the pump operation is poor after the matching gap increases due to wear. The sliding bearings and shaft sleeves must be replaced frequently, which increases the cost of operation and maintenance.

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