Today, I’d like to introduce some knowledge about the vacuum pump of the water ring, including the precautions for pipeline layout and the reason for adding some water. If you are interested, please read it
water ring vacuum pump design and layout of pipes notes
1. The discharge pipe of water ring vacuum pump and its pipe joint shall consider the maximum pressure that they can bear.
2. The pipeline of water ring vacuum pump shall be arranged as straight as possible to minimize the accessories in the pipeline and the length of the pipeline. When it is necessary to turn, the bending radius of the elbow shall be 3-5 times the diameter of the pipeline, and the angle shall be greater than 90 ℃.
3. The reasonable selection of pipe diameter for water ring vacuum pump is that the pipe diameter is large, the liquid flow speed is small and the resistance loss is small under the same flow rate, but the price is high and the pipe diameter is small, which will cause the resistance loss to increase sharply, increase the head of the selected pump, increase the belt power, increase the cost and operation cost. Therefore, it should be considered comprehensively from the perspective of technology and economy.
4. The discharge side of the water ring vacuum pump must be equipped with valves (ball valve or stop valve, etc.) and check valves. The valve is used to regulate the working point of the pump. The check valve can prevent the pump from reversing when the liquid flows back and prevent the pump from being hit by water hammer. (when the liquid flows back, it will generate huge reverse pressure, which will damage the pump)
water ring vacuum pump adding proper amount of water reason
The pump body of water ring vacuum pump is filled with appropriate amount of water as working fluid. When the impeller rotates in a clockwise direction, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness, which is determined by the shape of the pump cavity. The inner surface of the lower part of the water ring is just tangent to the impeller hub, and the inner surface of the upper part of the water ring is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring). At this time, a crescent space is formed between the impeller hub and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller.
If the bottom 0 ° of the impeller is taken as the starting point, the volume of the small cavity of the water ring vacuum pump increases from small to large when the impeller rotates 180 ° before, and is connected with the suction port on the end face, at this time, the gas is inhaled, and when the suction is finished, the small cavity is isolated with the suction port; when the impeller continues to rotate, the small cavity changes from large to small, so that the gas of the water ring vacuum pump is compressed; when the small cavity is connected with the exhaust port, the gas It is discharged from the vacuum pump.
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