Pipeline shielding structural electric pump working in manner of internal circulation

Abstract

The invention discloses a pipeline shielding structural electric pump working in a manner of internal circulation. The pipeline shielding structural electric pump comprises a pump body and a shielding motor connected to the pump body and is characterized in that a circulation through hole is arranged in a rotor shaft, one end of the circulation through hole is communicated with an impeller inlet,and the other end thereof is communicated with an inner cavity of an upper bearing seat; and grooves are respectively arranged on an upper graphite bearing and a lower graphite bearing, a gap betweena rotor shielding sleeve and a stator shielding sleeve is connected with the inner cavity of the upper bearing seat and a cavity body between an impeller back ring and a lower bearing seat through the grooves arranged on the upper graphite bearing and the lower graphite bearing, and the cavity body between the impeller back ring and the lower bearing seat is connected with an impeller chamber through an impeller balanced hole. Through decreasing total weight of a rotor and reducing pressure of the rotor acting on the lower bearing seat synchronously, the invention improves the axial force adjustment capacity of the shielding electric pump per se and prolongs the service life of the graphite bearings and the shielding electric pump; and the electric pump in an internal circulation structure can effectively prevent from leakage of the electric pump.

Description

Technical field: [0001] The invention relates to the field of pipeline-shielded electric pumps, in particular to a pipeline-shielded structural electric pump that works in an internal circulation mode. Background technique: [0002] The canned pump is a centrifugal pump, which uses a high-speed rotating impeller to make the liquid gain energy under the action of inertial centrifugal force to increase the pressure during operation. Compared with ordinary electric pumps, canned pumps have excellent advantages, and are widely used in various work systems, such as ground source heat pump air conditioning circulating water system; lithium bromide air conditioning unit system; heating heating circulating water system; fire water Pressurization system; tap water pressurization system; toxic and harmful liquid delivery system, etc. [0003] At present, some pipeline shielded electric pumps in the market mainly adopt the characteristics of the outer circulation structure. When in us...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that for the external circulation structure pipeline shield electric pump currently used in our country, due to the heavy weight of the rotor assembly itself, the graphite bearing in the lower bearing is too high, resulting in excessive wear of the graphite bearing. High, poor self-adjustment ability of axial force, and the operation of the outer circulation structure is reliable and poor, which may easily cause leakage of the outer circulation pipe and low service life. A pipeline shielded electric pump with an inner circulation structure is provided to meet the economical, performance needs

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