And the middle and low pressure fire pump is different, high and low pressure fire pump can usually be a separate output of low pressure or high pressure, can also be used in conjunction with high and low pressure, is the output of high pressure and low pressure two kinds of pressure water pump. High and low pressure fire pump according to its structure is divided into high and low pressure centrifugal vortex pump and high and low pressure series centrifugal pump two types.
1. High and low pressure centrifugal vortex pump :
Centrifugal vortex pump is high pressure pump model typical, by single or double stage centrifugal pump and vortex pump series, it is a low pressure centrifugal pump function, and can generate high pressure water according to the needs, to the need of high pressure water jet water supply equipment and appliances. Centrifugal vortex pump has the advantages of small size, compact structure, especially the general configuration of the high pressure hose reel and high-pressure water gun system, the fire quickly dispatched, to meet the requirements of rapid response. High pressure water gun can spray and direct water mist spray, the fire water use is flexible and can greatly improve the efficiency of fire water. The disadvantage is that the pressure is small and the water supply is weak.
2. High and low pressure series centrifugal pump :
High and low voltage series centrifugal pump by low pressure centrifugal pump and high pressure centrifugal pump series, two pump room independently, the middle separated by a partition, two pump room to ask the Unicom water conducting pipeline, water pipeline is provided with a high pressure switching valve, by controlling the switching valve, the pump chamber two series operation.
Low pressure centrifugal pump adopts single or double stage centrifugal pump, high pressure centrifugal pump adopts double stage or multistage centrifugal pump. Its structure is similar to the low pressure series centrifugal pump, impeller is quantity, pump shaft is long, difficult manufacture, high cost, high price.
