Submersible electric pump with intermediate bearing as main stress bearing

Abstract

The invention discloses a submersible electric pump with an intermediate bearing as a main stress bearing. The submersible electric pump mainly comprises a motor, a pump and an outer housing, wherein the motor is arranged inside the outer housing; the pump is arranged on the motor and the outer housing; a water inlet is arranged in the barrel wall at the lower end of the outer housing; an annular channel for passing water flow is arranged between a motor shell and the outer housing; the pump comprises an upper water pump cover, a lower water pump cover, an impeller, a guide vane, a guide vane barrel, a final-stage guide vane, a spacer bushing and a base plate, which are sleeved on a motor shaft in sequence except from the upper water pump cover, and are fastened by a nut at the shaft end; the motor shaft is arranged inside the motor shell by a bottom bearing, an intermediate bearing and a top bearing respectively. According to the submersible electric pump disclosed by the invention, the bottom bearing, the intermediate bearing and the top bearing form three-point support for the motor shaft, and the intermediate bearing bears all axial force and partial radial force, so that the sealing reliability of the motor is improved, the accumulated error is reduced, and operation precision and working efficiency of the electric pump are greatly improved.

Description

technical field [0001] The invention relates to a submersible electric pump whose intermediate bearing is a stressed main bearing, and belongs to the technical field of pumps. Background technique [0002] The submersible electric pump is a pump that is integrated with a motor and submerged into water to pump water. It is generally composed of a pump body, a water pipe, a pump base, a submersible motor and a starting protection device. In layman's terms, it is a machine that combines a pump and a motor to transport liquids. It is a widely used water treatment tool. Whether it is in agricultural production or industrial processing, submersible pumps exist everywhere. As far as the medium used, submersible pumps can be roughly divided into three categories: clean water submersible pumps, sewage submersible pumps, and seawater submersible pumps (corrosive). [0003] At present, domestically produced submersible pumps can be divided into up-pump type and down-suction type accor...

AI Technical Summary

Problems solved by technology

[0010] (1) Since the stressed main bearing is installed at the bottom of the submersible pump, the bottom bearing seat is easy to fall off and be damaged. Even if the bottom bearing seat wall is thickened, the bottom bearing seat is still prone to fall off due to the huge axial force Phenomenon;

[0011] (2) The motor cavity needs to be reliably sealed, but because the stressed main bearing is placed at the bottom, the force is unreasonable, causing the motor cavity to bear a large outward expansion force, which affects the sealing reliability of the motor cavity;

[0012] (3) Since the stressed main bearing is installed at the bottom of the submersible pump, the installation position of the stressed main bearing at the bottom is also the benchmark for the entire design and manufacture of the dimensional chain. The dimensional chain starts from the bottom and reaches the top. The dimensional chain is long and the cumulative error Large, so that the operation accuracy of the electric pump is reduced

[0013] (4) The cost is high. Since the bearing bearing the axial force is at the bottom, it starts from the bottom and reaches the top. Because the force arm is long, according to the principle of leverage, the force on each part is relatively large, and it is necessary to increase the wall thickness of the part and improve the quality of the part. machining accuracy, which increases the production cost

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