Shield electric pump for conveying media easy to solidify and crystallize

Abstract

The invention relates to a shield electric pump for conveying media easy to solidify and crystallize. The shield electric pump comprises a machine case, a stator and a rotor. The rotor is installed through a front bearing pedestal and a rear bearing pedestal which are arranged at the two ends of the machine case respectively. The stator is coaxially arranged in the machine case in a sleeved mode. The rotor protrudes and extends out of the front bearing pedestal and is fixedly connected with an impeller. The impeller is covered with a pump body, and the pump body and the machine case are fixed in a sealed mode. The side end of the pump body is provided with a feed port communicated with a pump cavity of the pump body. The upper end of the pump body is provided with a discharge port communicated with the pump cavity. An air gap passage is formed between the stator and the rotor. The position, corresponding to the stator, of the outer wall of the machine case is fixedly sleeved with a water jacket. Two steam jackets are fixedly arranged on the outer side of the pump body and the outer side of the rear bearing pedestal respectively in an attached mode. Through the arrangement of the steam jackets on the two sides and the water jacket, when solidified or crystallized media remain in the shield electric pump, the temperature of the shield electric pump can be raised by connecting steam to the shield electric pump so that the solidified or crystallized media can be molten; consequently, the problem that the media are solidified or crystallized is effectively and timely solved, and damage caused by blockage is avoided.

Description

technical field [0001] The invention relates to a canned electric pump, in particular to a canned electric pump for transporting easily solidified or easily crystallized medium. Background technique [0002] Canned electric pump is a kind of non-leakage pump, which is used to transport corrosive, harmful (such as highly toxic, radioactive), flammable, explosive, expensive or other special liquids. Due to the special purpose of the canned electric pump, its structure is also quite different from the ordinary electric pump. [0003] However, when traditional canned electric pumps are transporting, for some easily solidified media (such as heavy oil, asphalt, etc.) Solidification or crystallization phenomenon, especially when the canned electric pump is restarted after shutdown, there is often a certain amount of solidified or crystallized medium inside, which will cause blockage and damage in severe cases. Contents of the invention [0004] The purpose of the present inven...

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Problems solved by technology

[0003] However, when the traditional canned electric pump is transporting, for some easily solidified media (such as heavy oil, asphalt, etc.) and some easy to crystallize media (such as benzene, urea solution, etc.), due to the low freezing point of these substances, it is easy Solidification or crystallization phenomenon, especially when the canned electric pump is restarted after shutdown, there is often a certain amount of solidified or crystallized medium inside, which will cause blockage and damage in severe cases

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