5.11. The To/in compressor, - the general information and a functioning principle
To/in compressor design
Scheme of management in size of a piston stroke
Increase in a piston stroke
Piston stroke reduction
The design of air of the Infiniti QX4 models of the compressor of variatorny type (V-6) applied in central airs is presented on an illustration
the К/В compressor Design.
Basic element of a design of variatorny compressors is the shaking otboyny plate providing possibility of management of a piston stroke depending on requirements, shown to the current hladoproizvoditelnost of system. The size of a piston stroke of the compressor is defined by a tilt angle качающеся plates and provides necessary level of a discharge of a coolant in a range from 14.5 to 184 cm 3 (see an illustration the Scheme of management in size of a piston stroke).
The operating valve is switched on in soaking-up (low-pressure head) part of a refrigerator path and opens / is closed depending on pressure in a low-pressure head contour. At the expense of operations of the valve pressure control in a case is carried out. The corner of provision of a shaking plate is defined by a difference of pressure in a case and the working cylinder.
With increase in temperature loadings pressure in a low-pressure head part of system also increases, in a consequence of that the silfonny operating valve provides opening low-pressure head and closing high-pressure head path valves (see an illustration Increase in a piston stroke). Result of such switchings is alignment of karterny pressure with pressure in a low-pressure head part of system. Now pressure in the working cylinder becomes essential above karterny that leads to transfer of a shaking otboyny plate to the situation corresponding to the maximum piston stroke.
At movement with high speeds, and also at low temperatures in salon or outside of the car pressure in a low-pressure head part of system goes down (see an illustration piston stroke Reduction). Expansion сильфона occurs when lowering pressure to value about 177 kPas. Thus, pressure drop in a low-pressure head part of system leads to closing of soaking-up (inlet) port and opening digit (final) therefore karterny pressure raises. The difference of pressure ahead of and behind the piston provides the effort influencing a driving finger, located near a shaking otboyny plate. A driving finger with a pad take a position in which piston develops the maximum pressure. The size of piston pressure is between Ps values (pressure in a soaking-up contour) and close Pd to it (pressure from the digit party). At increase in karterny pressure (Pd) at the command of management the effort influencing a driving finger leads to reduction of a tilt angle of a shaking plate and, respectively, piston stroke reduction.
In other words, increase of karterny pressure leads to switching of a difference of pressure in a case and the working cylinder, and to corresponding change of an inclination of a shaking plate.
The coupling of coupling of the compressor is in an active condition, its compulsory disconnection from the main switch, the switch of the fan of a heater or the ignition switch will not be made yet. Automatic shutdown of the coupling is made for protection of the compressor also at low ambient temperatures and excessive lowering of level of a coolant in system.