Deep-well centrifugal pump with two thrust bearing pairs on each impeller

Abstract

The invention relates to a deep-well centrifugal pump with two thrust bearing pairs on each impeller. Each impeller is a closed impeller with a front cover plate and a rear cover plate; the diameter of the rear cover plate of the impeller is smaller than that of the front cover plate of the impeller; an inlet of the impeller adopts an end surface sealing way, and an end surface sealing pair at theinlet of the impeller is made into a thrust bearing pair capable of bearing axial force; an axial hole of the impeller is in clearance fit with a pump shaft; an impeller hub and a flow-guiding shellhub form a second thrust bearing pair; the lower end of the impeller hub is provided with wear-resistant rubber rotating together with the impeller hub; the upper end of the flow-guiding shell hub isprovided with a stainless steel flat plate integrated with a flow-guiding shell; and a contact surface between the wear-resistant rubber and the stainless steel flat plate is a bearing surface of thesecond thrust bearing pair. The invention has the advantages that the axial force of the impeller can be balanced and borne independently, the service life of the deep-well centrifugal pump is greatlyprolonged, and a solution is simple and reliable and needs low manufacture cost.

Description

Technical field [0001] The invention relates to a fluid machine for pumping deep well groundwater, in particular to a deep well centrifugal pump which needs to overcome axial force. Background technique [0002] At present, the known deep well centrifugal pumps all have serious axial force problems, because when the impellers are working, axial forces will be generated on the impellers. If there are more impellers in the deep well centrifugal pumps, the axial force problem will be serious. Generally, deep well centrifugal pumps use radial sealing rings and balance holes on the impeller to balance part of the axial force, and the remaining axial force is borne by the thrust bearing inside the motor. For deep well centrifugal pumps, the remaining axial force is sometimes very large. Large, and the thrust bearing in the submersible motor has limited ability to withstand axial force, so there is still the possibility of damage. The invention patent with the patent number ZL2006...

AI Technical Summary

Problems solved by technology

Generally, deep well centrifugal pumps use radial sealing rings and balance holes on the impeller to balance part of the axial force, and the remaining axial force is borne by the thrust bearing inside the motor. For deep well centrifugal pumps, the remaining axial force is sometimes very large. Large, and the thrust bearing in the submersible motor has limited ability to withstand axial force, so there is still the possibility of damage

The invention patent with the patent number ZL200610038596.X "a multi-stage centrifugal pump with self-balancing axial force of the impeller" adopts the method of reducing the diameter of the impeller rear cover plate to balance the axial force of the impeller, which has the defect of reducing the efficiency of the water pump, that is, to achieve the impeller For the automatic balance of the axial force, the diameter of the impeller rear cover must be greatly reduced, and the efficiency of the water pump will be significantly reduced at this time. The axial force acts on the end seal of the impeller, and when the well water contains sand, the end seal of the impeller will be damaged quickly

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