Bus Air Conditioner is a fully roof-mounted electric bus air conditioner.The condenser and evaporator assemblies of a Bus Air Conditioner are typically separate from the electric compressor and inverter power supply. This is a common situation.
The former is installed on the roof, while the latter is installed below the bus.
This setup takes up a lot of space in the vehicle.
Furthermore, the connection of the compressor, condenser, and evaporator assemblies requires piping and refrigerant charging only at the bus manufacturing site.
The connecting piping is approximately ten meters long, resulting in low heat exchange efficiency and high energy consumption.
Conserving materials and energy is a major trend, and therefore the bus market urgently needs new air conditioning products.
Utility Model Content
The fully roof-mounted Bus Air Conditioner features a compact and rational structure, occupies minimal roof space, and reduces costs and energy consumption.
Bus Air Conditioner solves its technical problems by employing the following technical solutions:
It comprises an air conditioner housing, a condenser core, a condenser fan, an evaporator core, an evaporator fan, a compressor, a power supply, and an electrical control unit. The evaporator core is located at one end of the air conditioner housing, the condenser core is located at the other end, and the compressor and power supply are located in the middle of the housing.
A PTC electric heater and evaporator fan are installed outside the evaporator core, while the condenser fan is located in the middle of the condenser core.
The compressor is connected to the condenser core, which in turn is connected to the evaporator core, and the evaporator core is connected to the compressor, forming a circulation system.
The pipes connecting the condenser core and the evaporator core are sequentially connected with a receiver-dryer and an expansion valve. The receiver-dryer comprises a receiver and a dryer, with a shutoff valve located between the receiver and the dryer.
1. Air conditioner housing, 2. Evaporator fan, 3. PTC electric heater, 4. Piping, 5. Compressor, 6. Dryer, 7. Shutoff valve, 8. Receiver, 9. Condenser fan, 10. Condenser core, 11. Intermediate chamber, 12. Power supply, 13. Expansion valve, 14. Evaporator chamber, 15. Evaporator core. The evaporator fan, condenser fan, and electrical control unit are driven by a low-voltage DC power supply, while the compressor is driven by an AC power supply.
Both the low-voltage DC power supply and the AC power supply are converted from the high-voltage DC power supply of the electric bus.
The evaporator core is located within the evaporator chamber, while the compressor and power supply are located within the intermediate chamber of the air conditioner housing.
Bus Air Conditioner has the following significant advantages:
Having all components located on the roof creates a compact and rational structure, occupies less roof space, reduces costs and energy consumption, and improves system performance.
The evaporator fan 2, condenser fan 9, and electrical control unit are driven by a low-voltage DC power supply.
The compressor 5 is driven by an AC power supply.
Both the low-voltage DC power supply and the AC power supply are converted from the high-voltage DC power supply of the electric bus.
The evaporator core 15 is located within the evaporator chamber 14.
The compressor 5 and power supply 12 are located within the intermediate chamber 11 of the air conditioner housing 1.
Intermediate chamber 11 serves as a heat sink, dissipating heat from the power supply 12.
Compressor 5 draws in low-temperature, low-pressure gaseous refrigerant at the outlet of evaporator core 15, compresses it into high-temperature, high-pressure gas, and discharges it from compressor 5.
The high-temperature, high-pressure superheated gaseous refrigerant enters condenser core 10 via pipeline 4, where it is cooled by the forced airflow created by the vehicle's forward motion.
The refrigerant condenses from gas to supercooled liquid, releasing a significant amount of heat energy into the atmosphere.
After passing through expansion valve 13, the higher-temperature and higher-pressure liquid refrigerant experiences a sharp drop in pressure and temperature, increasing in volume, and exits expansion valve 13 in a vapor-liquid two-phase state.
The vapor-liquid two-phase refrigerant enters evaporator core 15 via pipeline 4. Since the refrigerant's boiling point is significantly lower than the surface temperature of evaporator core 15, the liquid refrigerant evaporates into a gaseous state.
During the evaporation process, it absorbs a significant amount of heat energy from the surrounding air, generating a cooling and dehumidifying effect. The cooled air is then blown into the electric bus via evaporator fan 2.
Thus, the interior of the vehicle is cooled. The low-temperature, low-pressure gaseous refrigerant then enters compressor 5 and begins another cycle.
This process repeats itself, continuously lowering the temperature of the air surrounding evaporator core 15 and providing cooling to the electric bus via evaporator fan 2.
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