Sunday, June 16, 2013

UNLOADING MECHANISM OF REFRIGERATION COMPRESSOR (pics included)


UNLOADING MECHANISM OF REFRIGERATION COMPRESSOR!

unloaded position
When   the   compressor   is   not   in   operation,   the unloader  mechanism  is  in  the  unloaded  position. The mechanism is operated by oil pressure  from  the  capacity  control  valve.  The  oil pressure pushes the unloader spring against the unloader piston. 



loaded position
This action moves the unloader rod to the left, thereby  rotating  the  cam  rings.  As  the  cam  rings  are rotated, the lifting pins are forced upward, raising the suction valve off its seat. The suction valve is held in this  position  until  the  compressor  is  started  and  oil pressure of approximately 30 psi is reached. At that time, the oil pressure from the capacity control valve pushes the unloader piston back to the right against the unloader spring.  The  motion  transmitted  through  the  pushrod, it rotates  the  cam  ring.  This  lowers  the  lifting  pins  and allows the suction valve to close or operate normally and the  cylinder  to  become  loaded.  On  most compressors the unloader is connected to the cylinders in pairs.


2 comments:

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