A high-pressure diesel pump refers to a centrifugal pump with multiple impellers installed in series and flowing in series, so it is called a high-pressure diesel pump.
Essentially, the lift of a single-stage centrifugal pump is determined by the impeller structure type and peripheral speed.
If the speed cannot be increased due to other boundary conditions, and the specific speed is too small due to the increase in the diameter of the impeller, the efficiency is not high, and the lift can be increased by connecting multiple chambers in series.
By changing the number of stage chambers, the size and speed remain the same.
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The flow rate of a pressure diesel pump varies because the power demand and head are proportional to the number of stages.
A typical example of this type of pump is a segmented pump with multiple identical stage chambers connected in series.
This structure is more suitable for boiler feed pumps and industrial fields with higher pressure requirements.
The stages of a multistage pump do not have to be installed in series.
It can also be installed in pairs or groups to better balance axial thrust.
The high pressure diesel pump is characterized by its good economy for operating occasions with higher pressure.
Other advantages of the multi-stage structure include ease of access to the conduits behind each stage.
A cavity is reserved to increase the pressure at the rear.
All high pressure diesel pumps have a common disadvantage: as the number of stage chambers increases.
The susceptibility of pump rotors to external or self-excited vibrations is also increasing.
Each stage cavity contains an impeller, a guide wheel and a set of rotating guide vanes, which are installed together on the stage cavity pump casing.
Regardless of the number of stages of multistage pump products, an inlet housing with a radial or axial inlet connection pipe needs to be installed in front of the first stage chamber, the last stage chamber (tail chamber) is installed in the outlet housing, and the inlet housing is equipped with With pressure relief device and shaft seal.
The shared pump shaft, connecting bolts and base must be suitable for the number of stages.