Technology: Mechanical Seals for Zero Leakage

Mechanical Seals for Zero Leakage

Written by Thomas Yoon

A centrifugal water pump contains a few basic components as follows:

1) The housing for containing repparttar water. 2) The impeller attached to a rotating shaft that moves repparttar 133423 water. 3) The coupling that transmits repparttar 133424 rotating action of a motor (or other prime movers) to repparttar 133425 pump shaft. 4) The seal between repparttar 133426 housing and repparttar 133427 rotating shaft. 5) The bearings for ensuring that repparttar 133428 shaft turns smoothly. 6) The inlet and repparttar 133429 outlet ports for channeling repparttar 133430 water flow through repparttar 133431 pump.

In order for a pump to work, repparttar 133432 pump impeller must generate pressures inside repparttar 133433 pump housing. The seal between repparttar 133434 housing and repparttar 133435 rotating shaft plays a critical role in making repparttar 133436 pump work.

One of repparttar 133437 most common ways of sealing a rotating pump shaft is by using mechanical seals.

The 3 components of a mechanical seal are: 1) The rotating component that moves together with repparttar 133438 rotating shaft. 2) The stationary component that is fixed to repparttar 133439 pump housing. 3) The spring that presses repparttar 133440 rotating component onto repparttar 133441 stationary component axially.

Rotating Component

This is a ring, usually consisting of 2 types of materials - a soft carbon piece with a highly polished axial surface, and a rubber material or o-ring that is able to grip repparttar 133442 shaft for sealing against water leak through repparttar 133443 shaft surface.

Simple But Powerful Centrifugal Chillers

Written by Thomas Yoon

Centrifugal chillers are used for cooling large buildings in a centralized air conditioning system. There are other types of chillers using screw compressors and reciprocating compressors. These are usually smaller in size. Today's topic is about centrifugal chillers - repparttar

ultimate choice for any air conditioning installations higher than 500 RT (refrigeration tons)

Basically, centrifugal chillers use centrifugal fans to move repparttar 133422 refrigerant within repparttar 133423 chiller circuit. As with any refrigeration circuit, there must be a compressor, a condenser, an expansion device, and repparttar 133424 evaporator.

In repparttar 133425 case of repparttar 133426 centrifugal chiller, repparttar 133427 fan is repparttar 133428 compressor. Rotating at very high speeds, it is capable of pressurizing repparttar 133429 refrigerant gas so as to increase its temperature. Because repparttar 133430 pressure is so dependent on repparttar 133431 efficiency of repparttar 133432 impeller of repparttar 133433 compressor, repparttar 133434 impeller is very carefully designed to match repparttar 133435 system.

The clearances between repparttar 133436 impeller and repparttar 133437 housing at repparttar 133438 mouth ring (impeller suction) are made very small so as to reduce leaks back to repparttar 133439 discharge.

Usually inlet vanes that throttle repparttar 133440 gas control repparttar 133441 flow of repparttar 133442 gas, and thus repparttar 133443 chiller load. The expansion of repparttar 133444 liquid to gas is usually made through a fixed orifice.

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