Marine vortex pumps are a special form of centrifugal pumps, also called centrifugal vortex pump., 1.5CWX centrifugal vortex pump widely used in modern ships. Because the centrifugal vortex pump has simple structure and small volume, it can be made into a type of self-priming and can pump gas-liquid mixture.
Therefore, the application of centrifugal vortex pumps in small flow, high head and low power occasions has unique advantages. It has been widely used on ships. For example, the cooling water pump or lubricating oil pump of the supercharger installed at the high position of the main engine adopts the centrifugal vortex pump, daily water service for Hydrophore tank and Calorifier tank.
The vortex pump consists of a disc-shaped impeller with equal thickness installed on the pump shaft, and a pump casing and cover plate that are close to the impeller. The outer diameter of the impeller and the pump casing are provided with an annular flow channel, and the upper part is connected with a discharge port and a suction port.
When the vortex pump is working, the liquid advances helically in the flow channel, which makes the liquid gain energy many times, so it can generate a higher pressure head than the single-stage centrifugal pump. However, the liquid is constantly impacted during the spiral advance, and the energy consumption is large, so the efficiency of the centrifugal vortex pump is not high.
The most popular model of marine vortex pump in ships is 1.5CWX-2, the model meaning is:
1.5：Pump Inlet and Outlet Flange Divide 25 (mm)
CWX: Marine Horizontal Self-priming Centrifugal Vortex Pump
2：Specific Speed Divide 10 （integer）
If there is 1.5CWX-2A, the A meaning:
A：Pump Head Supported with Bracket (direct connection type not marked)
The installation fit clearance of the main parts of the vortex pump is as follows:
(1) The radial runout error of the shaft journal at each fitting of the pump shaft shall not exceed 0.02mm.
(2) The non-perpendicular error between the two ends of the impeller of the vortex pump and the center line of the pump shaft does not exceed 0.02mm.
(3) The axial gap between the impeller of the vortex pump and the pump body (or partition) is 0.15 ~ 0.25mm; this gap can be adjusted by the thickness of the paper pad between the pump body and the pump cover
