What is an electric bus air conditioner?
An electric bus air conditioner is a temperature control system designed specifically for electric buses. It does not rely on the engine of a traditional fuel bus, but is driven by a high-voltage power pack to achieve cooling, heating and air circulation functions.
What are the core components of electric bus air conditioners?
1. Electric bus air conditioner compressor
Drive mode: The power battery pack drives the permanent magnet synchronous motor through high voltage electricity, thereby driving the scroll compressor to operate, without the need for engine belt drive.
Energy efficiency optimization: The speed can be adjusted using variable frequency technology to adapt to different load requirements and improve energy efficiency.
2. Refrigeration cycle system
Core components: compressore, condensatore, evaporatore, valvola di espansione, dry filter, eccetera.
Working principle: The compressor compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gas, which becomes liquid after heat dissipation through the condenser. Dopo di che, it enters the evaporator through the expansion valve throttling to absorb heat, and finally sends cold air through the blower. Circulation work to achieve heat transfer in the bus. The operating principle is basically the same as that of traditional bus air conditioners.
3. Sistema di riscaldamento
UN. PTC electric heating: Directly heat the air or coolant through the electric thermistor, with a simple structure but high energy consumption.
B. Heat pump technology: Switch the refrigerant flow direction through a four-way reversing valve, use ambient heat for heating, and have significant energy-saving effects, but the structure is complex and the cost is high.
How to maintain an electric bus air conditioner?
Daily maintenance is mainly based on observation, cleaning, and basic inspection. If any abnormality is found, deal with it in time to avoid small problems from turning into major failures.
1. Observe the operating status: whether the start and stop are normal, and whether there is a fault code. Observe whether there are obvious abnormal sounds and vibrations during operation.
2. Clean the condenser fins: Check whether there is any blockage, and use a high-pressure air gun to blow it clean from the back.
3. Check the pipes and joints: Observe whether the refrigerant pipes are worn or cracked, and whether the joints are loose or leaking oil.
4. Check the drain hole: Check whether the drain hole at the bottom of the evaporator is blocked. It is recommended to use a thin wire or other methods to dredge and clean up the debris.
Maintenance precautions:
1. The vehicle high-voltage power supply must be disconnected before maintenance, and wait for more than 5 minutes for the capacitor to discharge. Inoltre, tools such as insulating gloves must be used.
2. Although R407C is an environmentally friendly refrigerant, direct inhalation will still cause safety issues, so it needs to be operated in a well-ventilated area;
3. The maintenance of electric bus air conditioning involves both electrical and refrigeration areas, and it is recommended that it be operated by trained professionals.
What is the refrigerant for electric bus air conditioning system?
Generalmente, it is R407C. R407C is an environmentally friendly refrigerant with a large cooling capacity per unit volume. It has a better cooling capacity per unit volume than R134A, and is more environmentally friendly than R22 and will not damage the ozone layer.
