How to improve the self-lubricating cooling conditions of the magnetic pump and prevent the liquid film of the friction pair from vaporizing and causing dry friction is the key to solving the demagnetization of the magnetic rotor in the magnetic pump. At the same time, considering that the conveyed medium is volatile and vaporized, according to the principle of energy conservation, the vaporization temperature of the medium can be increased by reducing the velocity energy of the medium and increasing the static pressure energy. be effectively prevented. According to the above ideas, a scheme of transforming the shaft and the impeller of the magnetic pump at the same time is proposed, which is expected to completely solve the problem of demagnetization of the magnetic rotor in the magnetic pump. The specific reform measures are as follows:
(1) Change the magnetic pump shaft from half-hollow to full-hollow and drill the return hole into a through hole to increase the cooling and lubricating flow of the medium.
(2) During installation, the spiral grooves of a pair of sliding bearings (the spiral grooves help the medium to flush and lubricate the shaft, and the direction of rotation of the spiral grooves should be paid special attention to) match the rotation directions, so that the cooling medium flows more smoothly, and the outer magnetic rotor rotates at a high speed. The heat generated by the induced eddy current can be taken away in time, improving the cooling and lubricating effect of the sliding bearing, the pump shaft and the thrust ring, and maintaining a liquid film between the friction pairs to achieve liquid friction.
(3) Cut the impeller. Cutting the impeller under the condition that the efficiency is basically unchanged, on the one hand, the vaporization temperature of the medium can be increased by reducing the velocity energy of the liquid and increasing the static pressure energy; And vaporize. At the same time, the operating range of the magnetic pump is expanded, and the influence of process fluctuations on the pump is reduced.
(4) Install the magnetic pump protection system. When the driven parts of the magnetic drive are running under overload conditions or the inner magnetic rotor is stuck due to the shaft, the main and driven parts of the magnetic drive will automatically slip off to protect the pump.