A compressor is actually an unit that essentially has the ability to increase the pressure on air (a gas) in a cylinder by making use of pressure to the air and and thus lowering its volume. Quite simply, air is pumped into a cylinder on a steady basis, therefore increasing pressure on the air and thus decreasing the volume of the air. Such compressed air is then released to offer energy in driving tools and other purposes.
There are actually effectively 3 key forms of compressor examples, i.e.: Open, Hermetically sealed (a tight and perfect closure) and Semi-hermitically sealed.
Every type of compressor has its use area and the variances lie fundamentally in the construction of these units.
An open compressor is a machine where the motor that drives the compressor is positioned outside the sealed compressor tank and it will depend on lubrication to be put on its seals in order to conserve a non leaking environment. As long as the device is in operation the lube process is maintained and no leaks arise. Seals are often made of leather or rubber. If the compressor is not in use these seals can become dry and gas leakages will result. The main benefit of an open system is that the components are independently reachable for upkeep and further may be driven by means of an internal combustion engine or a turbine. Therefore huge compressors can be built and applied to development sites or in mines. Smaller sized open systems could also be used in say a fridge but as time passes it is bound to leak gasses.
A hermetically sealed compressor is one where the complete functioning system is enclosed within a single machine and no leakage can occur. The advantage of such units is that everything is sealed in a single unit and no leakages can occur and the motor is cooled down by the surrounding gasses being compressed. The issue with such units is if they go faulty, the whole unit needs to be replaced. These units are well-liked in the use of delivering pressurised systems in fridges and freezers in a small form.
A semi-hermetic system is one where the motor and the compressor is housed in a single shell or envelope, but uses seals to enclose the machine. Should either the motor or the compressor fall short they could be exchanged and the repaired unit can be sealed again. So the main benefit from a hermetically sealed or a semi- hermetically sealed compressor lies in the fact that they cannot leak. Even left abandoned for a time frame, they will function flawlessly well on being cranked up again. An open system, on the other hand, needs to be operated often to retain its gasses. Application of open systems like in the case of car air conditioning will demand the replacement of gasses on occasion. The use of compressors is very extensive and varies from massive open systems used on construction sites to tiny hermetically sealed units, which are typically desk top units, used by artists in air brush applications.
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