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Posted by PaPaPeng on January 16, 2008, 4:57 pm
On Wed, 16 Jan 2008 19:50:28 -0000, AZ Nomad
>
>>Not likely. The motor is hermetically sealed inside the heavy gauge
>>metal canister (took me forever to cut open one) and bathed in oil.
>>That's why it is "silent". The only rubber inside it is a short
>>length of insulated wire. If this burns the odors wouldn't escape
>>from inside the canister and you won't be able to smell it.
>
>the compressor doesn't have a seal with a shaft going through it?
The outside connections are
1. short wire from the relay to the motor brushes.
3. three tubes: one refrigerant out, one refrigerant return and one
refrigerant recharge. This last one is normally pinch sealed.
>
>
The compressor and motor have a common housing and shaft. The
compressor is a very simply constructed single cylinder banger built
like a tank and will never break down. This compressor crankshaft is
extended to form the electric motor shaft. This compressor-motor
combo is mounted vertically on four compression springs welded to the
bottom of the canister. The compressor to spring mounting is with
rubber grommets. This locates the combo in the middle of the
canister and the arrangement is for noise isolation. This is also
why you must not lay down a fridge or air conditioner on its side as a
grommet may pop out off its spring. That causes the combo to be
unbalanced and you will hear an annoying metallic clunk every time the
compressor starts up or stops. The wobble from inertia causes the
combo to hit the side of the canister. With time that flexes the
inside electrical wire to the motor and fractures it. That how I
got my (office fridge) compressor to cut open. Internal compressor
problems are not fixable.
The vertical mounted combo has its motor shaft end dipped in around
two inches of oil at the bottom of the canister. The motor
commutator is half submerged in oil, so neither the brushes nor the
commutator will wear out over the life of the fridge. Something else
will crap out first. The function of the oil is to act as a solvent
and therefore a storage reservoir for the refrigerant. It of course
serves as a lubricant. There is a third function I had not suspected
of before and which most fridge guys don't know about. When the
compressor runs oil is drawn through the motor shaft-crankshaft and
spews out the top like a lawn sprinkler. As the oil passes through
the crankshaft it absorbs heat from the compressor. The hot oil
spewing out from the top is flung to the side of the canister where it
runs down to the reservoir. The wall of the canister dissipates heat
from the hot oil. This means the compressor canister will fell hot
but will never get hot enough to scald or to set something on fire.
The design features of the fridge compressor have been around for
probably as long as modern fridges have been around. I can't conceive
any improvements that can be made to this design. The only change I
know of is the replacement of Freon with a non CFC eco friendly
refrigerant. This advertised claims of high efficiency fridges for
which you pay a premium price is no more than improvements in
insulation and cosmetic changes.
the canister. The motor commutator is half submerged in oil, so
neither the brushes nor the commutator will wear out over the life of
the fridge. Something else will crap out first. The function of the
oil is to act as a solvent and therefore a storage reservoir for the
refrigerant. It of course serves as a lubricant. There is a third
function I had not suspected of before and which most fridge guys
don't know about. When the compressor runs oil is drawn through the
crankshaft-motor shaft and it spews out at the top like a lawn
sprinkler. As the oil passes through the crankshaft it absorbs heat
from the compressor. The hot oil spewing out from the top is flung to
the side of the canister where it runs down to the reservoir. The
walls of the canister dissipates heat from the hot oil. This means
the compressor canister will fell hot but will never get hot enough to
scald or to set something on fire.
The design features of the fridge compressor have been around for
probably as long as modern fridges have been around. I can't conceive
any improvements that can be made to this design. The only change I
know of is the replacement of Freon with a non CFC eco friendly
refrigerant. This advertised claims of high efficiency fridges for
which you pay a premium price is no more than improvements in
insulation and cosmetic changes..
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