Suction stroke and lift of water pump
The absorption process is also called the "largest self-priming height" (also can be understood as "the degree of self suction). Micro pumps do not add water at the circumstances, can automatically water suction pump up the maximum height (the vertical distance from the pump to be pumped from the mouth of pumping liquid).Generally lower than the water pump positioned equal when there is self-priming pump required capacity. For example, outdoor tourism, need to extract the water in the river, with the best micro pump self-priming ability (impossible to people ran to the river water inlet pipe with water. It) or pumping the liquid corrosion, easy to add water and so on occasions.
For example: there is a kind of water pump, the model is called "BSP" series, the volume is not large, but the nominal suction process can be 4 meters, it can not add water to 4 meters, it is considered to be relatively high in the micro pumpIn micro pumps, not all pumps have self-priming capacity ("suction stroke")Some centrifugal pumps there is no self-priming ability to use must first do add water. Although some micro pump with self absorption capacity, but "suction" are often the subject of "and the water inlet pipe in all air, can smoke the vertical height of water gap, even only half not so. The pump selection, the absorption process is a relatively important parameter.
Lift pump lift pump can lift refers to the height, usually expressed in H, the unit is m. centrifugal pump lift to the impeller center line, divided by two parts. The vertical height from the pump impeller centerline to the water surface, the water pump to suck water up to the height, called water head, referred to as suction pump impeller; from the center line to the vertical height of the water tank, the water pump can put pressure on the height, called water pressure head, referred to as the pressure. The pump head = + suction head pressure water head should be pointed out that the nameplate marked head refers to the pump itself can produce lift, it is not with the pipe flow friction resistance caused by the loss of lift. In the selection of water pump, attention can not be ignored. Otherwise, will be pumping Sheung Shui.
