Method and device for inhibiting cavitation in liquid machinery
A liquid and mechanical technology, applied in the field of suppressing cavitation generation and devices in liquid machinery, to achieve the effect of suppressing noise and vibration
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Embodiment 1
[0021] Embodiment one: see figure 1 , the method for suppressing cavitation in liquid machinery is characterized in that a cooling pipe 2 with good thermal conductivity is installed on the leading edge of the blade 1 in the liquid machinery or a low-pressure flow area where "cavitation" is easy to occur, and the cooling pipe 2 The cooling medium 3 is introduced to reduce the temperature of the liquid flowing through the area of the blade 1 by 1-100°C, thereby reducing the saturation pressure of the liquid in this area, avoiding vaporization, suppressing the occurrence of initial cavitation, and achieving corrosion inhibition.
Embodiment 2
[0022] Embodiment two: if figure 1 , the device for suppressing cavitation in liquid machinery. The blade is the stationary blade 1 of an axial flow turbine. A cooling pipe 2 is installed along the span direction on the front edge of the blade 1. Air is selected as the cooling medium 3, and dry ice is used as the cold source 4. The cooling pipe 2 flowing through the blade 1 is made of a material with good thermal conductivity, and the exposed part of the cooling pipe 2 is wrapped with a heat insulating material. A fan 5 is installed in the cooling pipe 2 loop to drive the flow of the cooling medium in the loop. The cooling pipe 2 flowing through the cold source 4 is designed as a traditional heat exchanger shape to ensure sufficient heat exchange, and the cold source 4 is filled with an appropriate amount of dry ice. In this way, the temperature of the water flowing through the leading edge of the blade drops by 5-10 degrees, which reduces the saturation temperature by 800-1...
Embodiment 3
[0023] Example 3: Participate Figure 4 with Figure 5 This is a device for suppressing cavitation in liquid machinery. The blade is a propeller blade 1. A cooling pipe 2 is installed on the leading edge of the blade 1 and a lower pressure area on the surface of the blade. Air is selected as the cooling medium 3. The source 4 adopts a refrigerator, and the high-pressure end (inflow) of the cooling pipe 2 communicates with the high-pressure ring 8 in the rotating shaft 7, and the low-pressure end (outflow) of the cooling pipe 2 communicates with the low-pressure ring 9 in the rotating shaft 7. A conventional sealing device 10 is adopted between the rotating shaft 7 and the stator 11. In the stator, the high-pressure ring 8 and the low-pressure ring 9 are folded into an inlet 12 and an outlet 13 respectively, and a fan 5 and a fan 5 are installed upstream of the inlet 12. The valve 6, the upstream of the valve 6 is a refrigerator 4, and the upstream of the refrigerator 4 commun...
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