Inner cooling circulation system structure for magnetic pump

Abstract

The invention provides an inner cooling circulation system structure for a magnetic pump. The inner cooling circulation system structure is characterized by being composed of a liquid inlet hole (A), a liquid inlet hole (B), a liquid inlet hole (C), a liquid outlet hole (D) and a pressure balance back flow hole (E), wherein the liquid inlet hole (A) is formed in a pump cover (2) and leads to a shaft cavity (4) between a left sliding bearing (3a) and a right sliding bearing (3b); the liquid inlet hole (B) is formed in a main shaft (5) and leads to the back end of the main shaft (5); the liquid inlet hole (C) is distributed and radially formed in the back end surface of an inner magnetic rotor (6) and communicates with the liquid inlet hole (B) in the main shaft; the liquid outlet hole (D) is formed in the pump cover (2) and leads to an isolation sleeve inner cavity (70b) on the front side of the inner magnetic rotor (6); the pressure balance back flow hole (E) is formed in an impeller (1); and a medium conducts centrifugal pump effect action when passing the liquid inlet hole (C) in the inner magnetic rotor (6), so that the flowing capacity of the cooling medium is promoted. The inner cooling circulation system structure for the magnetic pump is suitable for conveying easily-cavitated media, prevents the situation that heat of a magnetic vortex returns to an inlet of the impeller and produces steam explosion and cavitation phenomena, improves the anti-cavitation performance of the magnetic pump, and is more suitable for complicated working conditions.

Description

technical field [0001] The invention relates to a magnetic pump, in particular to the structure of the internal cooling circulation system of the magnetic pump. Background technique [0002] The internal cooling circulation system of the magnetic pump transports the medium in the pump chamber to the isolation sleeve as a circulating coolant to take away the heat from the isolation sleeve, front and rear thrust plates, and front and rear sliding bearings. The bearing acts as a lubricant. [0003] The internal cooling circulation system of the magnetic pump in the prior art consists of a liquid inlet hole leading to the inner cavity of the isolation sleeve opened on the pump cover corresponding to the high pressure area at the outlet of the impeller of the pump chamber, and a return hole opened in the center of the pump shaft. The pressure balance return hole opened at the root of the wall, the medium conveyed in the pump chamber enters the inner cavity of the isolation sleev...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned prior art, when the flow rate of the medium at the outlet of the pump chamber is too low and the flow rate is too slow, the natural circulation capacity of the internal cooling circulation system of the above-mentioned magnetic pump is greatly reduced, and the medium flow rate in the internal cooling circulation system of the magnetic pump is not enough for cooling. When the heat is taken away, it will cause the inner magnetic rotor to lose magnetism due to excessive temperature rise; at the same time, it will also cause the temperature of the sliding bearing to be too high

[0005] Moreover, when the temperature of the conveyed medium is high, the internal cooling circulation system of the magnetic pump cannot effectively remove heat, and it will further heat the isolation sleeve, internal magnetic rotor, sliding bearing, etc., causing damage to the magnetic pump

[0006] In addition, when the transported medium is easy to cavitation medium, when the medium heated as cooling liquid passes through the inner cavity of the spacer sleeve and enters the center of the impeller (low pressure area) from the return hole opened in the center of the pump shaft, due to the pressure drop of the medium Steam explosion and cavitation are very easy to occur; at the same time, when the heated medium meets and mixes with the low-temperature medium at the entrance of the impeller center (low pressure area), it will heat the low-temperature medium, thus causing low-temperature medium to easily produce steam explosion. , cavitation phenomenon, vibration and dry sound, resulting in unstable operation of the magnetic pump and accelerated damage to the magnetic pump

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