(18) Nanjing Iveco light car air conditioning circuit
Nanjing Iveco light-duty air-conditioning system is a non-independent structure, driven by the engine crankshaft pulley through the electromagnetic clutch of the compressor, and the electromagnetic clutch is determined by the temperature control switch (manual or automatic and manual combination) to determine the separation and combination, the refrigeration part It consists of compressor, condenser, liquid reservoir, expansion valve, evaporator, electric control system and pipeline. The refrigerant is R-12 (Freon), and the refrigeration method is vapor compression refrigeration. After the refrigerant absorbs the heat in the cab in the evaporator, it evaporates and vaporizes into a vapor body, and after being insulated and compressed by the compressor, it becomes a high-temperature (about 7 ° C) high-pressure (about 1.5 MPa) vapor body and is sent to the front of the car. Cooling in the condenser.
After the high temperature and high pressure refrigerant vapor enters the condenser, it condenses into a high pressure liquid, releases the heat of condensation, and transfers the heat in the refrigerant to the atmosphere, thereby lowering the temperature of the refrigerant. The liquid of the high-pressure refrigerant is discharged from the condenser, dried and filtered by the liquid storage, throttled by the expansion valve and greatly reduced to about 0.2 MPa, and becomes a low-pressure liquid-gas mixture and enters the evaporator again.
The refrigerant after throttling and depressurization is vaporized into a low-pressure (0.2 MPa) and low-temperature (O°C - 5 ° C) refrigerant vapor in a vaporized state in an evaporator, thereby absorbing heat around the evaporator (vaporization) Heat), the temperature inside the toilet is lowered. As long as the compressor is running continuously, the above process will continue to circulate (compression, heat dissipation, condensation, throttling, heat absorption, evaporation, compression, heat dissipation and condensation...), and the temperature and humidity in the vehicle are regulated in an appropriate range. Inside.
1. The role of each component on the air conditioning control panel (Figure 20)
(1) The power/air volume switch (SA) is a four-position knob switch, the “0†block cuts off the power supply; the “IIIIII†block (or L, M, H blocks) turns on the power, and at the same time makes the evaporator fan supply air. The quantity is correspondingly in a small, medium, and large state.
(2) The cooling mode switch (SA2) is only A40.10. The light vehicle enhanced air conditioning system has this switch. It is a single-pole, single-throw switch. When the upper end is pressed (ie HAND block), the air conditioning system adopts forced cooling mode. At this time, the temperature inside the car is not affected by the temperature controller (WKQ), and the cooling process continues until this switch. When disconnected, when the lower end of the mode switch is pressed (ie AU-TO block), the air conditioning system is temperature-controlled and cold-type, and the start and stop of the cooling process are controlled by the thermostat.
(3) The thermostat potentiometer (RP) is mounted on the printed circuit board of the thermostat, which can be used to set the indoor cooling temperature. When the potentiometer is in two extreme positions, the temperature in the cabin is set to 18~32 °C (or the evaporator outlet temperature is set at 3~18 °C). When the potentiometer is in the middle position, the temperature in the cabin is set to 25 °C (or the outlet temperature of the evaporator is set at 11 °C). When the actual temperature in the car is higher than the set temperature, the cooling starts, and the cooling stops when the actual temperature is lower than the set temperature.
(4) There are only one indicator light on the air conditioning control panel of some models, indicating that the refrigeration system is put into the working force port of 30.10V, 40.10V, 40.10VS and 35.10. However, most of them are equipped with power indicator (POWER), cooling indicator (COOU, low voltage fault warning light (LP) and high voltage fault warning light (HP). Their functions are as follows: power indicator (POlVER): air volume switch is not When the position is zero, the light is on, indicating that the air conditioning system control power is on.
Cooling indicator (COOL; this light is on when cooling, indicating that the air conditioner compressor and its electromagnetic clutch are working, the light is off when the cooling is stopped. The low pressure fault indicator (LP), when the refrigerant pressure in the pipeline is too low (such as serious Leakage), the light is on. At the same time, under the action of the pressure control switch, the compressor stops working. High-pressure fault indicator (HP): When the refrigerant pressure in the pipeline is too high (such as pipeline blockage, condenser fan motor does not work) When the light is on, the compressor is stopped under the action of the pressure control switch.
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