The impurities, tiny solid particles in the water body, or the gas nucleus that exist in the gap between the contact surface of the liquid and solid contact surface will quickly grow into an empty bubble that can be seen by the naked eye. Under the action of pressure, the process and discharge process of empty bubbles involve multi -physical and chemical phenomena, which will generate noise and vibration, and erosion on the material of overcurrent components. This phenomenon is called the erosion of pipeline sewage pumps.

The main hazards of three aspects of the pipe pumping steam erosion: worsen the performance of the pipe pump, and a large amount of empty bubbles will be generated during the occurrence of steam erosion. When the water contains a large amount of empty bubbles, the normal law of the water flow will be destroyed, so that the leaf grooves effectively excessive the flow surface area Decreased, the direction of flow changes, and the energy loss increases, which causes the rapid decline in pipeline pump flow, raising and efficiency, and even disconnection occurs when steam erosion is severe.

Damaged overcurrent components and data show that when the empty bubbles are brought to the high -pressure area to quickly condense and disappeared, the water flow mass impacts at a high speed to the empty bubble, which will cause a strong impact. In the past, its instant local pressure can reach dozens to hundreds of mega Pa, and the frequency of action can reach 20-30,000 times per script, which is very impact.

Under the repeated effect of high -intensity impact, the pipe pump wall surface produces local deformation and hardening and brittleness, producing metal fatigue, and causing metal to break and peel off. In addition to the mechanical effect, it is also mixed with the chemical corrosion of metal and the electrochemical corrosion of the metal in the metal of the deep lively gas (such as oxygen) in the water body. Under the comprehensive effect, the pipe pump wall appeared at first, and then became a honeycomb -shaped. In severe cases, the wall surface would be hit in the short term.