Refrigerant compressor, function - GF83.55-P-2100-02P
Function
The rotary movement of the belt pulley (1) is transmitted via the refrigerant compressor shaft (13) to the stop plate (12), which is permanently fastened to the refrigerant compressor shaft (13) by way of a press fit.
The rotation of the stop plate (12) is transmitted to the swash plate (4) by means of a hinged mechanism.
Conversion of the swash plate's (4) rotary motion into the oscillating motion of the seven pistons (6) takes place via two sliding shoes each (11).
The evaporation tank on the pressure side (5) and evaporation tank on the suction side (7) reduce gas pulsation in the refrigerant compressor by providing for uniform refrigerant flow. This helps to prevent noise in the compression process
Volume control
The refrigerant compressor control valve (8) has a corresponding control current applied to it to match the output requested. This in turn enables the compression volume to be regulated between 2 and 100 %.
The position of the swash plate (4) is determined through monitoring, processing and evaluation of the following automatic air conditioning controlled variables:
- Pressure in the crankcase (2) of the refrigerant compressor
- Diaphragm pressure in the refrigerant compressor control valve (8) (approx. 2 bar)
- Suction pressure of refrigerant compressor
The change in suction pressure which is dependent on the control current on the refrigerant compressor control valve (8) induces a change of pressure in the crankcase (2) and thus a corresponding adjustment of the swash plate (4).
Automatic air conditioning (AAC [KLA]) OFF
If the automatic air conditioning is regulated or manually switched off, the refrigerant compressor control valve (8) is completely opened. Refrigerant flows unobstructed over the high pressure side into the crankcase (2). This in turn leads to a rapid pressure rise in the crankcase (2). The coil body (10), for closing the refrigerant compressor, is displaced here to the right against the valve plate (9) and thus stops the flow of refrigerant over the intake side.
Refrigerant compressor lubrication when automatic air conditioning switched off
An internal lubrication circuit ensures the lubrication supply for all moving parts.
Lubrication is ensured at a minimum refrigerant compressor volumetric flow by means of two valves being regulated. In doing so, the refrigerant is transported together with the compressor oil located in the crankcase (2) over the bored refrigerant compressor shaft (13). The mixture enters the cylinder housing, where it is compressed and then pumped into the refrigerant circuit.