Delphi Inside Compressors

Delphi Inside Compressors
TECHNICAL BULLETIN
Technical Information – What does Delphi Inside consist of?
The job of a compresser
The Compressor is commonly referred to as the heart of the system. It is a
belt-driven pump (unless the car is a hybrid or electric vehicle) and is responsible for
compressing and transferring the refrigerant gas. IT MUST NOT TRY TO
COMPRESS LIQUID. If it does, it will lock, and fail.
The air conditioning system is split into two areas: high-pressure and low-pressure.
These can be broadly defined as discharge and suction. The intake or suction side of
the compressor draws in refrigerant gas from the low pressure side, and the
discharge side pushes out high pressure gas to the condenser.
The main type of compressor is a displacement (piston) type compressor. This will
either be a Fixed Displacement or Variable Displacement (often referred to as CVC).
Fixed Displacement
Fixed displacement compressors have a swash plate which is set at a fixed angle.
This means that whenever the compressor is turning, the pistons are always moving
through the same travel, compressing the gas. The only variables therefore are
compressor speed and quantity of refrigerant in the system. Fixed displacement
compressors have a clutch which turns it on and off.
Variable Displacement CVC)
Variable displacement compressors have a swash plate which is held at an angle
with two springs. These will react to pressure, and therefore the swash plate angle
can be adjusted. The actuator (by which you can identify this as a variable
compressor) controls the pressure to the swash plate. This means that there is a
variable output for this compressor. It is so effective that in some cases there is no
clutch fitted to these and they spin continuously, varying the refrigerant compression
according to demand. The variables therefore are compressor speed, quantity of
refrigerant in the system and swash angle
To talk with a technical expert on this subject, call
00442078586890 or email dpss.helpline@delphi.com
Delphi Inside Compressors
TECHNICAL BULLETIN
Technical Information – What does Delphi Inside consist of?
Delphi has proven high quality OE technology in compressors. This has been made
available to the aftermarket. The CVC technology has been put into the shells which
fit aftermarket applications. So what are the features of the CVC compressor that
make them so good even compared with most OE manufacturers?
The CVC Pistons
The pictures on the right below show an OE compressor with the pistons still inside
and then the pistons removed. This is a typical set up and uses pistons fixed to the
swash plate. The pictures on the left show a Delphi Inside CVC. Notice the very light
pistons which float (are not fixed) on the swash plate>this reduces weight, friction
and pumping losses allowing the compressor to match the output of the comparison
with less emissions, less heat and more efficiency. Note these two compressors are
for the same application.
To talk with a technical expert on this subject, call
00442078586890 or email dpss.helpline@delphi.com