Magnetic drive pump with pump shaft axial displacement monitoring device

Abstract

The invention discloses a magnetic drive pump with a pump shaft axial displacement monitoring device. The magnetic drive pump is characterized in that an eddy current sensor probe (10) is installed ona pump cover (2), and the head of the eddy current sensor probe (10) goes deep into the side portion of a shaft shoulder of the pump shaft (3) or goes deep into the side portion of a shaft sleeve component (B) fixedly connected to the pump shaft (3). The high-frequency oscillation current of the eddy current sensor probe generates an alternating magnetic field in a coil at the head of the probe to act with a metal surface close to the magnetic field, the single-value function of the distance delta is obtained from the characteristic impedance of the eddy current sensor, and the distance deltais converted into the change of the current through processing, so that the axial displacement of the pump shaft is monitored in real time, and when the axial displacement exceeds an allowable range,an alarm is given, and the pump is stopped for maintenance.

Description

technical field [0001] The invention relates to a magnetic pump, in particular to a magnetic pump with a pump shaft axial gap monitoring device. Background technique [0002] The silicon carbide thrust bearing of the magnetic pump and the end face of the sliding bearing form a pair of axial friction pairs, which bear unbalanced axial force. The magnetic pump seriously deviates from the working point, or the density and viscosity of the medium will affect the axial force of the pump. The magnitude and direction of . After the friction pair surface of the thrust bearing and the sliding bearing is worn, the axial displacement of the magnetic pump shaft will increase, and the axial fit clearance and displacement of the rotor on the pump shaft will increase. The sealing rings between the pump bodies fail to cooperate, and even the magnetic rotor and the bearing seat have friction, which seriously affects the normal and safe operation of the pump. However, the wear state of the ...

AI Technical Summary

Problems solved by technology

After the friction pair surface of the thrust bearing and the sliding bearing is worn, the axial displacement of the magnetic pump shaft will increase, and the axial fit clearance and displacement of the rotor on the pump shaft will increase. The sealing rings between the pump bodies fail to cooperate, and even the magnetic rotor and the bearing seat have friction, which seriously affects the normal and safe operation of the pump.

However, the wear state of the pump shaft bearing device and the axial movement of the pump shaft cannot be observed from the outside of the pump, resulting in damage to the pump.

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