Features and structure of high pressure diesel pump

High pressure diesel pump refers to a centrifugal pump with multiple impellers installed in series and flow in series, so it is called high pressure diesel pump.

In essence, the head of a single-stage centrifugal pump is determined by the type of impeller structure and circumferential speed.

If the speed cannot be improved due to other boundary conditions, and if the specific speed is too small due to the increase of the impeller diameter and the efficiency is not high, the head can be improved through the series connection of multiple stage chambers.

By changing the number of stage chambers while the size and speed remain the same.

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The flow rate of the pressure diesel pump changes because the power demand and head are proportional to the number of stage chambers.

A typical example of this type of pump is a segment pump with a number of identical stage chambers connected in series.

This type of structure is more suitable for boiler feed water pump and industrial areas where pressure requirements are higher.

The stage chambers of the multi-stage pump do not have to be installed in tandem.

It can also be mounted in pairs or in groups to better balance the axial thrust.

The characteristic of high pressure diesel pump is that it has good economy for higher pressure operation occasions.

Other advantages of the multistage structure include the ease of use of the guide tubes behind each stage chamber.

Empty chambers are reserved for increased pressure in the rear.

All high pressure diesel pumps have a common disadvantage: with the increase in the number of stage chambers.

The sensitivity of the pump rotor to external or self-induced vibration is also increasing.

Each stage chamber contains an impeller, a guide wheel and a set of rotary guide vanes, which are mounted together on the stage chamber pump housing.

Multi-stage pump products regardless of the number of stage chamber, in front of the first stage chamber need to install an inlet housing with radial or axial inlet connecting pipe, the last stage chamber (tail chamber) is installed in the outlet housing, the inlet housing is equipped with a pressure relief device and shaft seal.

Shared pump shafts, connecting bolts and pedestals must be appropriate for the number of stage chambers.