Type D multistage pump main components

Before the d-type multi-stage water pump replacement or repair, have to know the D type multistage pump which parts, replace the related parts to facilitate maintenance. Type D multistage pump parts mainly include centrifugal pump water pump casing, impeller, seal nut, pump cover, impeller, mechanical parts, motor and other parts.

D type multistage pump effect of main components:

1, the action of type D multi-stage pump shell. Holds the impeller sealing in a certain space, so that by the effect of impeller of suction and pressure liquid. shell into a spiral shape, it is also called the volute. , because of the port area gradually expanded from the impeller around the high-speed liquid gradually reduce the flow velocity, the part of the kinetic energy is converted to static pressure can effectively. Not only collected by the impeller pump shell out liquid, but it is also an energy conversion device.

most of the horizontal multi-stage centrifugal pump shell shapes are basically the volute, multi-stage horizontal centrifugal pump is radial split shell is usually round or ring shell. Volute pump shell lumen a spiral type liquid, to collect from the impeller in the liquid, and the spread of the pipe to the outlet of a centrifugal pump. Centrifugal pump pump shell under all the work pressure and heat load of the medium.

2, D type multistage pump impeller. Is a centrifugal pump impeller, the moving parts through multistage pump impeller for medium to hard, the form of impeller are closed, open impeller, half open impeller impeller 3 kinds. Closed impeller efficiency is higher, open impeller efficiency is low, the commonly used multistage centrifugal pump products are closed impeller, so the type D oh more efficient.

the role of the impeller is the prime mover's mechanical energy directly to the liquid, in order to increase the static pressure of the liquid and the kinetic energy ( The main can increase the static pressure) 。

impeller generally have curved blade after 6 ~ 12 pieces.

impeller has open, half closed and closed three.

open impeller in blade on both sides of the cover plate, simple manufacture, convenient cleaning, suitable for conveying materials containing relatively large amounts of suspended solids, low efficiency, the transmission of liquid pressure is not high. Half closed on the suction side of impeller cover plate, and on the other side has a flat, suitable for conveying easy precipitation or materials containing particles, and a low efficiency; In closed impeller impeller blade on both sides of the plate before and after, high efficiency and is suitable for conveying clean fluid contains no impurities. Centrifugal pump impeller for such more generally.

there are single suction and double suction impeller liquid two ways.

3, D type multistage pump seal ring. Centrifugal pump seal ring is often said that the o-rings, o-rings role is to prevent the internal leakage of the pump and external leakage, by four fluorine material or fluorine rubber and nitrile butadiene rubber o-rings, put on the cover plate of the impeller and pump shell, the damage can be replaced.

4, D type multistage pump shaft and bearing. Fixed impeller centrifugal pump pump shaft head, a head of motor rotor, or coupling coupling with the pump head. According to the size of the centrifugal pump, can choose different forms of bearing in the rolling bearing and sliding bearing.

5, D type multistage pump seal. Role is to prevent the liquid in the pump casing leakage along the axis or outside air leakage into the pump housing. Centrifugal pump seal mechanical seal or packing two kinds commonly. Filler in general use oiled or coated with graphite asbestos rope. Mechanical seal is by mounted on the shaft collar and fixed on the pump casing between static ring end face of relative motion and achieve the purpose of sealing.

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