According to the different working principles of the pump, there are mainly the following categories of marine pumps:
(1) Positive displacement pump
The positive displacement pump relies on the movement of the working parts to cause the periodic increase and decrease of the working volume to absorb and discharge the liquid.
When the working volume increases and the pressure decreases, the liquid is sucked in,
When the working volume decreases and the pressure increases, the liquid is discharged, and the pressure of the liquid can be directly increased by extrusion.
Depending on the way the moving parts move,It can be divided into two types: reciprocating pump and rotary pump.The former has piston pump and plunger pump.
Piston pump working principle diagram
Working principle diagram of hydraulic plunger pump
(2) impeller pump
The impeller pump uses the impeller to drive the liquid to perform high-speed rotary motion, continuously produces suction and discharge, and transmits mechanical energy to the liquid being transported, so that the pressure of the liquid can be increased and the purpose of transporting the liquid can be achieved.
According to the different structural characteristics of the impeller and flow channel of the pump, It can be divided into centrifugal pump and vortex pump.
Working principle diagram of centrifugal pump
Vortex pump working principle diagram
(3) Jet pump
The jet pump relies on the working fluid with a certain pressure to generate high-speed jet ejection fluid in the nozzle, and then increases the energy of the ejected fluid through momentum exchange.
Depending on the working fluid used,It can be divided into water jet pump, steam jet pump and air jet pump.
Working principle diagram of steam jet pump
In addition to being classified according to different working principles, pumps can also be divided into vertical pumps and horizontal pumps according to the position of the pump shaft;
☆According to the number of suction ports, it can be divided into single-suction pump and double-suction pump;
☆According to the prime mover driving the pump, it is divided into electric pump, steam pump and diesel engine pump.
Generally, the pumps are named according to the function of the pump on board, such as the main engine sea water cooling pump, main engine lubricating oil pump, etc.
