One Inch Four Stroke Centrifugal Pump
Gas bearing phenomenon: If the centrifugal pump is full of gas before the centrifugal pump is started, the center of the impeller after starting can't form enough vacuum degree at this point, so the liquid in the storage tank cannot be sucked away. This phenomenon is called gas bonding. To...
Gas bearing phenomenon: If the centrifugal pump is full of gas before the centrifugal pump is started, the center of the impeller after starting can't form enough vacuum degree at this point, so the liquid in the storage tank cannot be sucked away. This phenomenon is called gas bonding.
To prevent the air from sticking, the centrifugal pump must be filled with external liquid to fill the space inside the pump casing before starting the centrifugal pump. This step is called an irrigation pump. In order to prevent the liquid injected into the pump casing from flowing into the lower casing due to gravity, a check valve (bottom valve) is installed at the inlet of the pump inlet. If the position of the pump is lower than the level in the tank, you do not need to start the pump. Pump.
(1) The impeller is mounted on the periphery of the impeller, so that the liquid energy conversion efficiency in the pump is high. The guide wheel is a stationary blade ring located on the periphery of the impeller. The bending direction of these blades is opposite to the bending direction of the impeller blades. The bending angle is exactly the same as the direction of liquid flow from the impeller, guiding the liquid to change direction steadily within the channel of the pump housing, minimizing energy loss, and converting dynamic pressure energy into static. Pressure energy is efficient.
(2) The balance hole on the rear cover eliminates axial thrust. The pressure of the liquid leaving the periphery of the impeller is already high, and a part of it will infiltrate behind the rear cover of the impeller, and the front inlet of the impeller is at a low pressure, thus creating an axial thrust pushing the impeller towards the inlet side of the pump. This can easily cause wear of the impeller in contact with the pump housing and can cause vibration under severe conditions. The balance hole leaks part of the high pressure liquid to the low pressure area, reducing the impeller and front and rear pressure differentials. However, this also leads to a reduction in pump efficiency.
(3) The shaft seal device ensures the normal and efficient operation of the centrifugal pump. Centrifugal pump in the work of the pump shaft rotation and the housing does not move, if the gap is not sealed or sealed, the outside air will infiltrate the low pressure area of the center of the impeller, so that the pump speed and efficiency of the decline. Severe flow is zero - gas bundling. In general, mechanical seals or packing seals can be used to achieve the seal between the shaft and the housing.