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For the wear of slurry pumps conveying solid-liquid mixtures, theoretical analysis and research have been carried out on the wear mechanism and wear laws. At the same time, a large number of experimental work have been carried out, and the protective measures for pump wear and valuable data on the pump site have been proposed.

Slurry pump wear mechanism

Slurry pump wear will have adverse consequences. Due to the wear and tear of the pump, its working condition deteriorates and its efficiency decreases, which increases the energy consumption of the pump, shortens its service life, and finally fails to work. Slurry pump wear can be mainly divided into cavitation wear and abrasive wear.

1. Steam loss

The destruction of spherical cavitation bubbles in liquids is not instantaneous, but undergoes multiple decay processes. In this process, the liquid rushes to the center of the cavity at a very high speed, and most of its kinetic energy is converted into spherical shock waves propagating in all directions at the moment of forming a new cavity. The mechanical force of the shock wave acting on the wall of the flow-around structural element is the main cause of cavitation wear.

A large number of tests and observations have been carried out on cavitation damage of hydraulic machinery, and it can be assumed that there is a lawful relationship between the amount of wear W and the relative velocity V of the liquid flow

W-AV

In the formula, W-mass loss caused by cavitation;

A - the size factor related to the test conditions;

V--the relative velocity of liquid flow;

OK.

2. Abrasive wear

In addition to the above-mentioned wear, the wear of the flow parts of the slurry pump is abrasive wear. According to the wear characteristics, all the parts of the centrifugal fan can be divided into two categories. The first category includes the impeller and the pressurized water chamber, and the flow path is severely worn; the second category is the wear of the suspended reservoir flow from the high-pressure chamber to the low-pressure chamber. Parts: case body, impeller outer plate, seals and shaft seals. Starting from the fastest worn parts, the damage order is: D body diaphragm; @ blade inlet side, @ impeller seal ring, @ her seal; suction side Pump cavity: @pump body diffusion tube.

3. Wear mechanism

Micro-analysis of the surface of the material caused by material information, such as the former depends on the regulation (machine regulation), viscosity, service, etc., and the microscopic analysis of the reconciliation of the table shows this mechanism, which depends on the flow state.