detailed description:
[0093] The key parameters such as the operating parameters of the system, the opening and closing of the air supplement and ventilation solenoid valves, the adjustment of the throttle valve, the reading of the temperature sensor parameters, and whether to defrost or not are all controlled by the centralized control unit. The present invention proposes a pure electric passenger car air-conditioning system capable of defrosting in zones. By setting up two independent heat pump type air-conditioning systems and adopting a centralized control unit, it is used for cooling and heating in the car, and when it is in a low temperature environment, Sequentially defrost the left and right systems to ensure that at least one of the subsystems in the entire system is in the normal heating mode. At this time, the hot air on one side can be sent to the other side through the connecting air duct to satisfy the heat in the car. Comfortable needs.
[0094] Option One:
[0095] figure 1 Shown is the schematic diagram of the air-conditioning dual system principle. The main circuit mainly includes: the first compressor 1', the second compressor 1 (compressor 1'is used below to represent the first compressor 1', and the compressor 1 represents the second compressor 1 ), the first four-way valve 2', the second four-way valve 2 (the following four-way valve 2'represents the first four-way valve 2', the four-way valve 2 represents the second four-way valve 2), the first outdoor change Heater 3', the second outdoor heat exchanger 3 (hereinafter the condenser 3'represents the first outdoor heat exchanger 3', and the condenser 3 represents the second outdoor heat exchanger 3) and the first filter drier 4', The second dry filter 4 (the dry filter 4'is used below to represent the first dry filter 4', and the dry filter 4 represents the second dry filter 4), the first sight glass 5', and the second sight glass 5 (The sight glass 5'is used below to represent the first sight glass 5', and the sight glass 5 represents the second sight glass 5), the first throttle element 6', and the second throttle element 6 (the throttle element is used below 6'represents the first throttle element 6', the throttle element 6 represents the second throttle element 6), the first flasher 7', the second flasher 7 (the flasher 7'is used below to represent the first flasher Flasher 7', flasher 7 represents the second flasher 7), third throttle element 8', fourth throttle element 8 (the second throttle element 8'is used below to represent the third throttle element 8' , The second throttling element 8 represents the fourth throttling element 8), the first indoor heat exchanger 9', the second indoor heat exchanger 9 (the evaporator 9'is used below to represent the first indoor heat exchanger 9', evaporating Device 9 represents the second indoor heat exchanger 9), the first gas-liquid separator 10', the second gas-liquid separator 10 ((the gas-liquid separator 10' is used below to represent the first gas-liquid separator 10', The separator 10 represents the second gas-liquid separator 10), and the two system components are the same). Other devices include a first temperature sensor 12' and a second temperature sensor 12 (the temperature sensing bag 12' is used below to represent the first temperature sensor 12', and the temperature sensing bag 12 represents the second temperature sensor 12), and a set of centralized control unit 14 , Used to control the actions of all devices and monitor system operating parameters.
[0096] The exhaust port of compressor 1 (1') is connected to one end of condenser 3 (3') via four-way valve 2 (2'), and the other end of condenser 3 (3') is passed through filter drier 4 (4'), The sight glass 5 (5') enters the first throttling element 6 (6'), and then connects to the first port of the flasher 7 (7'), and the second port of the flasher 7 (7') passes through The second throttling element 8 (8') enters the evaporator 9 (9'), and then connects to the four-way valve 2 (2'), and then passes through the gas-liquid separator 10 (10') to the compressor 1 (1) ') The suction port is connected, the compressor line and each temperature sensor and other various controller circuits are connected to the centralized control unit. The third port of the flasher 7 (7') is connected to the air supply port of the compressor 1 (1') through the air supply branch, and the air supply solenoid valve 11 (11') is provided on the air supply branch for control Whether the air-conditioning system performs supplementary air operation.
[0097] For ordinary cooling (heating), the left and right systems can operate cooling (heating) independently according to the instructions issued by the centralized control unit. At the same time, it can be determined whether to open the second solenoid valve 11 ( 11') to run the air supplement function.
[0098] figure 2 It is shown that when heating is operated in a low temperature and high humidity environment, the condenser 3 (3') is prone to frost, which affects the heating capacity sent to the car. In this case, sub-system defrosting is required. 1) The heating mode of the left system operation: the high-temperature refrigerant discharged from the compressor 1'passes through the four-way valve 2'and then enters the evaporator 9'for condensation and heat dissipation, heating the car environment, and then passing through the second throttle element 8' After throttling, the gas-liquid two-phase refrigerant flows in from the second port of the flasher 7'and is separated in the flasher 7'. The liquid refrigerant flows out of the first port of the flasher 7'and then passes through the first section. The flow element 6'throttles, and then passes through the sight glass 5', the filter drier 4', and enters the condenser 3'to evaporate and absorb heat. The gaseous refrigerant flows from the third port of the flasher 7'into the air supplement branch through the supplement The gas solenoid valve 11' enters the air supply port of the compressor 1', and finally the refrigerant from the condenser 3'passes through the four-way valve 2'and the gas-liquid separator 10' and then enters the suction port of the compressor 1'to complete the entire refrigerant cycle. 2) The defrosting mode of the right system operation: the high-temperature refrigerant discharged from the compressor 1 passes through the four-way valve 2 and enters the condenser 3, defrosts the frost on the condenser 3, and then passes through the filter dryer 4 and the sight glass 5 Entering the first throttling element 6, the gas-liquid two-phase refrigerant flows from the first port of the flasher 7 into the flasher 7 and is separated, and the liquid refrigerant flows out of the second port of the flasher 7 and then passes through the second port. The throttle element 8 throttling, enters the evaporator 9 to evaporate, and then connects with the four-way valve 2, and then connects with the suction port of the compressor 1 through the gas-liquid separator 10, and finally completes the entire refrigerant cycle. 3) After the condenser 3 on the right system is defrosted (the centralized control unit judges according to the temperature sensor 12 on the condenser 3), it will switch to the heating mode to heat the car, and the left system will heat from The mode is switched to the defrosting mode to remove the frost on the condenser 3'. 4) If the condenser 3 (3') has detected no frost, it will operate in the normal heating mode.
[0099] As above, the centralized control unit supplies heat at the same time or district heating according to the actual operating conditions to realize continuous heating in the car. In addition, in order to maximize the comfort of heating in the car, there are two heating and heating systems in the left and right systems. When defrosting on the other side, a connecting air duct can be set between the left and right air ducts in the car, and the opening is controlled by a solenoid valve in the middle. When defrosting on one side, the fan is stopped to prevent cold air from blowing. When the solenoid valve is opened, the hot air on the other side is introduced to this side, so that hot air is sent to both sides, such as Figure 4.
[0100] Compressor 1 (1') can be a scroll quasi-two-stage compressor, a dual-rotor two-stage supplemental gas enthalpy-enhancing compressor, or a combination of two single-stage compressors in any form.
[0101] In the above-mentioned various modes, when the supplemental air enthalpy increase is not required, the supplemental air solenoid valve 11 (11') can be switched to the normal mode of the air conditioning system.
[0102] Option II:
[0103] Such as image 3 As shown, compared with scheme 1, this scheme is that the ordinary air-conditioning system does not have the function of supplementing air and increasing the enthalpy. The compressor is an ordinary single-stage compressor without flasher 7 (7') and second throttling element 8. (8') and supplemental air solenoid valve 11 (11') and the supplementary air branch. This scheme can also realize continuous heating operation during defrosting, but the low-temperature heating capacity will be slightly lower than scheme 1.
[0104] third solution:
[0105] Such as Figure 4 As shown, compared with the first solution, this solution does not have a connecting air duct. This solution can also achieve continuous heating operation during defrosting, but there will be no hot air blowing when one side is defrosted, and the comfort is slightly worse.
