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A hermetic compressor is a sealed unit that combines the compressor and motor, making it smaller and more efficient. It does not require lubricants and can be stored for long periods. However, it cannot be opened for repairs and must be replaced if there is a problem. Gas is used to power it, but if there is a leak, it can cause extensive damage.
A hermetic compressor is a compressor unit which, unlike others, is completely sealed. Most compressors must have the compressor and motor connected via a belt to function properly, but a hermetic compressor combines the two units. One problem with this type of drive is that it cannot be opened; if there is a problem, the compressor usually needs to be replaced. The whole unit is sealed so there is almost no way for the gas to escape unless the shielding is broken. No lubricants are needed to keep this compressor running and it can typically be stored for months or years without starting problems.
Most superchargers are actually made up of two pieces: the motor and the supercharger. A belt is usually needed so the two can be connected and the motor can drive the supercharger. With a hermetic compressor, both pieces are sealed within a steel shield. This normally makes the compressor smaller and operators rarely have to worry about the motor not driving the compressor.
Gas is often used to power a hermetic compressor and this could be a problem with other compressors. If the seals are not maintained, gas can leak out and damage these compressors. Shielding on a hermetically sealed compressor keeps the gas trapped inside the unit. At the same time, if a gas leak occurs, it can cause extensive internal damage, which ultimately renders the compressor inoperable.
Most compressors need lubricants to keep rubber, leather or belt materials soft and supple; otherwise, the materials dry out and become unusable. When these compressors are stored for a long time, the lubricant will dissolve and the belt will need to be replaced before these compressors can be used again. The hermetic compressor does not have a belt and the compressor is not open to the world, so there is no need for lubricants. This means that a hermetic compressor can be stored for months or years and can usually be restarted without problems.
While airtight sealing offers many benefits, there is one major drawback. A normal compressor can be opened and repaired in case of problems. Opening a hermetic compressor cannot be done without seriously damaging the unit. If opened, the steel shield must be replaced by hermetically sealing a new shield to the compressor. Opening and repairing this type of compressor is often expensive and difficult, so it is commonly thrown out and replaced with a new compressor.
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