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Multi-stage shielding electric pump comprising inner circulating hole

A technology of shielding electric pump and internal circulation, which is applied to the components, pumps, pump devices and other directions of pumping devices for elastic fluids, can solve the problems of increasing the connection structure, reducing the safety, increasing the pipeline, etc., and achieves structural safety. Reliable, reduce flow loss, increase the effect of mechanical strength

Pending Publication Date: 2020-11-13
DALIAN HERMETIC PUMP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the application of series-type multi-stage canned electric pumps, the demand for large-flow high-lift pumps is increasing day by day. Although the internal circulation and external circulation pipelines can be changed to meet the large-flow requirements, but the increase in pipelines and connection structures will lead to leakage points. , reduced security

Method used

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  • Multi-stage shielding electric pump comprising inner circulating hole
  • Multi-stage shielding electric pump comprising inner circulating hole

Examples

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Embodiment 1

[0023] This embodiment discloses a multi-stage shielded electric pump with internal circulation holes, the structure of which is as follows Figure 1-2 As shown, it includes a shielded motor stator housing 7, a front impeller group and a rear impeller group. The inner side of the shielded motor stator housing 7 is covered with non-magnetic Hastelloy to avoid the invasion and damage of the conveying medium. The shielded motor stator casing 7 is provided with a shielded electric pump shaft rotor assembly 8, and an air gap is provided between the shielded motor stator casing 7 and the shielded electric pump shaft rotor assembly 8 (the air gap is generally about 2 mm to 3 mm ), the chamber of the front impeller group 2 communicates with the air gap.

[0024] The rotor shaft of the shielded electric pump shaft rotor assembly 8 is a hollow shaft, and the central hole diameter of the hollow shaft is determined according to the design of the motor and the design of the circulation cha...

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Abstract

The invention provides a multi-stage shielding electric pump comprising an inner circulating hole. The multi-stage shielding electric pump comprises a shielding motor stator casing, a front impeller group and a back impeller group; a shielding electric pump shaft rotor assembly penetrates through the shielding motor stator casing; a shielding motor casing front cover and a shielding motor back cover are arranged at the two ends of the shielding motor stator casing; a rotating shaft of the front impeller group is connected with a rotating shaft of the back impeller group through the shielding electric pump shaft rotor assembly; a suction end cover of the front impeller group covers one side, opposite to the shielding motor stator casing, of a shielding motor front impeller group; a pump body of the back impeller group is connected with a rotating shaft of a shielding motor back impeller group; and a back sealing cover covers one side, opposite to the shielding motor stator casing, of ashielding motor back impeller group. The electric pump is safe and reliable in structure, through optimization of the inner structure, the inner flow state of a fluid is improved, and the flow requirement of the series type multi-stage shielding electric pump is increased.

Description

technical field [0001] The invention relates to electric pump technology, in particular to a multi-stage shielded electric pump with internal circulation holes. Background technique [0002] Sealless shielded electric pumps are widely used in petroleum, petrochemical, nuclear power and other high-risk fluid transportation fields. Series multistage canned electric pumps are suitable for high head working conditions. With the application of series-type multi-stage canned electric pumps, the demand for large-flow high-lift pumps is increasing day by day. Although the internal circulation and external circulation pipelines can be changed to meet the large-flow requirements, but the increase in pipelines and connection structures will lead to leakage points. , the security is reduced. Contents of the invention [0003] The purpose of the present invention is to propose a multi-stage shielded electric pump with internal circulation holes in response to the increasing demand fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D13/06F04D1/08F04D29/58F04D29/046F04D29/06
CPCF04D13/0606F04D1/08F04D29/5806F04D29/046F04D29/061
Inventor 孙德福邹立莉杨春兰李海博邱罡孟晖张荣玮刘冀鹏杨波
Owner DALIAN HERMETIC PUMP
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