High lift floating impeller well submersible pump

Abstract

The invention relates to a submersible electric pump for a high-lift floating impeller well; a submersible motor is fixedly arranged on the lower end of a water inlet joint; a connecting seat is fixedly arranged on the upper end of the water inlet joint; a first stage of impeller is arranged in the inner cavity of the connecting seat; a first stage of diversion shell is arranged on the connecting seat; a second stage of impeller is arranged in the inner cavity of the first stage of diversion shell; a second stage of diversion shell is arranged on the first stage of diversion shell; a third stage of impeller is arranged in the inner cavity of the second stage of diversion shell; a final stage of impeller is arranged in the inner cavity of the previous stage of diversion shell; a last stage of diversion shell is arranged on the previous stage of diversion shell; the impellers are connected and sleeved on a pump shaft through keys and can trip along the axial direction of the pump shaft; a water outlet seat is arranged on the last stage of diversion shell; and the water inlet joint, the connecting seat, the diversion shells and the water outlet seat are tightened, fixed and sealed through tiepieces, and the tripping gaps of the impellers are reserved between the upper end surfaces of the impellers and the lower end surfaces of the diversion shells. According to the submersible electric pump for the high-lift floating impeller well, the automatic balance of axial force is realized, the operation is stable and reliable, the service life of the motor is prolonged, and the efficiency and the single-stage lift of the water pump are improved.

Description

technical field [0001] The invention belongs to the technical field of submersible electric pumps for wells, and in particular relates to a high-lift floating impeller submersible electric pump for wells. Background technique [0002] The existing submersible pumps for wells are composed of submersible motors, water inlet joints, impellers, guide vanes, pump casings, pump shafts, water outlet seats and other components. When working, the pump shaft transmits the power of the motor to the impeller. The work done by the impeller transmits the water flow through the guide vane to the next impeller. There are following defects: [0003] 1. Since the impeller adopts an axially fixed and step-by-step compression structure, the single-stage impeller does not have the ability to adjust up and down by itself. During operation, the pressure difference generated by the front and rear cover plates of the impeller generates an axial force, which is transmitted to the motor step by step,...

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Problems solved by technology

[0004] 2. Due to the processing error of the impeller (generally 0 to 0.1mm), after multi-stage assembly (more than 30 stages, that is, accumulatively assembling 30 impellers), the accumulated processing error will offset the overall design momentum of the submersible pump (generally is 3.5 mm), the final effective momentum is 0, or even negative, resulting in the impeller stuck and unable to operate, especially for high-lift (above 600 meters) multi-stage pumps

[0005] 3. When working, the water flow is transmitted to the guide vane through the impeller. The guide vane adopts positive and negative double-sided guide vanes. The water flow is not smooth, the hydraulic loss is large, the efficiency is low, and the single-stage lift is low.

[0006] 4. The upper pump casing is pressed with a fixed nut. The fixed nut has been eroded by water flow for a long time, and the phenomenon of rust is serious. It is not easy to install and maintain, and the shaft sleeve and other parts are added, and the cost is high.

[0007] 5. The guide part of each stage is composed of pump casing and guide vane, which increases the number of parts and components to be processed, and the production cost is high

[0008] 6. The impeller inlet adopts a sealing ring structure. When the submersible pump stops, the sediment in the water will accumulate at the impeller inlet ring. When it starts up again, it is easy to cause the impeller to be stuck or the motor load to increase, resulting in failure to start or motor overload. burnt out

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