The Main Components of Centrifugal Pump

Date: 2022-10-21     From: Longding     Author: admin

The main components of centrifugal pump are impeller, pump shell and shaft sealing device. Centrifugal pump is widely used in the mining processing flow. Small size, simple operation and long service life are the outstanding advantages of centrifugal pumps.

1. Impeller

The role of the impeller is to transfer the mechanical energy of the prime mover directly to the liquid to increase the static pressure energy and kinetic energy of the liquid (mainly increase the static pressure energy). The impeller generally has 6~12 pieces of curved blade. Impeller has single suction and double suction two suction methods.

Impeller has open, semi-closed and closed three. The OPEN IMPELLER HAS NO COVER plate ON BOTH sides of the blade, which is easy to manufacture and easy to clean. It is suitable for conveying materials with large amount of suspended matter, and the liquid pressure of conveying is not high. The semi-closed impeller has no cover plate on one side of the suction inlet, and a cover plate on the other side. It is suitable for conveying materials easy to settle or contain particles, and the efficiency is also low. Closed impeller has front and rear cover plates on both sides of the impeller blade, high efficiency, suitable for conveying clean liquid without impurities. General centrifugal pump impeller for this kind of.

2. Pump casing

The role of the pump shell is to seal the impeller in a certain space, so that the impeller suction and pressure out of the liquid. Pump shell made more volute shape, it is also known as volute. Due to the gradual expansion of the cross-sectional area of the flow channel, the velocity of the high-speed liquid flung out from around the impeller gradually decreases, so that part of the kinetic energy is effectively converted into static pressure energy. The pump housing not only collects the liquid thrown out by the impeller, but also serves as an energy conversion device.

3. The shaft sealing device

The function of the shaft seal device is to prevent the liquid in the pump shell from leaking out along the shaft or the outside air from leaking into the pump shell. The commonly used shaft seal device has packing seal and mechanical seal two kinds. The packing is usually made of asbestos rope dipped in oil or coated with graphite. Mechanical seal is mainly installed on the shaft of the ring and fixed on the pump shell between the end face of the ring for relative motion to achieve the purpose of sealing.