Vehicle air conditioning system with photo-thermal defrosting function and vehicle

Abstract

The invention provides a vehicle air conditioning system with a photo-thermal defrosting function and a vehicle. The vehicle air conditioning system with the photo-thermal defrosting function comprises a first heat exchange system, a fin heat exchanger, a second heat exchange system, a third heat exchange system, a control module and an infrared light source, wherein the first heat exchange system and the fin heat exchanger are arranged outside a compartment; the first heat exchange system comprises a compressor, a condenser, a throttle valve and a first evaporator which are connected in sequence and form a closed loop; the second heat exchange system comprises a first inner heat exchanger, a coolant pump and a first heat exchange section which are sequentially connected to form a first loop; the third heat exchange system comprises a secondary refrigerant pump, a second heat exchange section, a second evaporator and a second inner heat exchanger which are connected in sequence and form a second loop; the fin type heat exchanger comprises a first fin with a carbon nano tube deposition layer, and the infrared light source is used for irradiating and heating the first fin. According to the vehicle air conditioning system, the use safety of the vehicle air conditioning system is improved, and the vehicle air conditioning system also has high defrosting capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air conditioning systems, and in particular to a vehicle air conditioning system with a photothermal defrosting function. The present invention also relates to a vehicle equipped with the vehicle air conditioning system with a photothermal defrosting function. Background Art

[0002] The Kigali Amendment to the Montreal Protocol states that hydrofluorocarbon refrigerants with high global warming potential (GWP) should be gradually reduced and phased out. The GWP of R290 (propane) is close to 0, which is much lower than the GWP of traditional automotive air conditioning refrigerants such as R134a and R410A. Therefore, R290 has great potential in responding to global climate change, can meet the future demand for environmentally friendly refrigerants in automotive air conditioning, and is in line with the general trend of energy conservation and emission reduction.

[0003] In addition, R290 has the following advantages: as a hydrocarbon refrigerant, it has a wide source and low acquisition cost; it has good thermodynamic properties and high refrigeration efficiency; it has a large cooling capacity per unit volume, so it is beneficial to reduce the refrigerant charge in the vehicle air-conditioning system, which is beneficial to the lightweight production of automobiles and reduces automobile energy consumption.

[0004] However, we also need to pay attention to the safety issues brought by R290 as a refrigerant. R290 is a hydrocarbon and is highly flammable. Its lower combustion limit is about 2.1%. A mixed gas containing a small amount of R290 is very likely to burn or explode when it encounters a suitable ignition source. In a vehicle, the refrigerant of a conventional vehicle air-conditioning system will pass through the interior of the vehicle. Using R290 as a refrigerant will pose a safety hazard and affect the safety of the vehicle air-conditioning system. Summary of the invention

[0005] In view of this, the present invention aims to provide a vehicle air-conditioning system with a photothermal defrosting function to improve the safety of the vehicle air-conditioning system.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A vehicle air conditioning system with a photothermal defrosting function, comprising:

[0008] A first heat exchange system and a fin heat exchanger, a second heat exchange system, a third heat exchange system, a control module and an infrared light source are arranged outside the vehicle compartment;

[0009] The first heat exchange system comprises a compressor, a condenser, a throttle valve and a first evaporator which are sequentially connected to form a closed loop;

[0010] The second heat exchange system comprises a first internal heat exchanger, a coolant pump and a first heat exchange section which are sequentially connected and form a first loop, the first heat exchange section is in contact with the condenser and forms heat transfer, and the first internal heat exchanger is arranged in the air duct of the vehicle compartment;

[0011] The third heat exchange system comprises a refrigerant pump, a second heat exchange section, a second evaporator and a second internal heat exchanger arranged in the air duct, which are sequentially connected to form a second loop, and the second heat exchange section is in contact with the first evaporator to form heat transfer;

[0012] The control module is used to control the fin heat exchanger to be connected to the first circuit or the second circuit, and to control the second internal heat exchanger to be connected to or disconnected from the second circuit; when the vehicle air-conditioning system is in a cooling state, the fin heat exchanger is connected to the first circuit and releases heat, and the second internal heat exchanger is connected to the second circuit and absorbs heat; when the vehicle air-conditioning system is in a heating state, the fin heat exchanger is connected to the second circuit and absorbs heat, and the second internal heat exchanger is disconnected from the second circuit;

[0013] The fin heat exchanger includes a first fin having a carbon nanotube deposition layer, and the infrared light source is used to irradiate and heat the first fin.

[0014] Further, the control module includes a first control valve and a second control valve connected in series between the coolant pump and the first heat exchange section, a third control valve and a fourth control valve connected in series between the second heat exchange section and the second evaporator, and a controller connected to the first control valve, the second control valve, the third control valve, and the fourth control valve in communication with each other;

[0015] The fin heat exchanger is connected between the first control valve and the second control valve, and a third pipeline is connected between the first control valve and the second control valve; the controller controls the working state of the first control valve and the second control valve to connect the fin heat exchanger to or disconnect from the first circuit;

[0016] The second internal heat exchanger is connected between the third control valve and the fourth control valve, and the fin heat exchanger is connected between the third control valve and the fourth control valve; the controller controls the working state of the third control valve and the fourth control valve so that the fin heat exchanger or the second internal heat exchanger is connected to the second circuit.

[0017] Furthermore, a first pipeline is connected between the third control valve and the fourth control valve;

[0018] The vehicle air conditioning system also has a defrost state; when the vehicle air conditioning system is in the defrost state, the first pipeline is in a conducting state, the second internal heat exchanger and the fin heat exchanger are disconnected from the second circuit, and the fin heat exchanger is connected to the first circuit and releases heat.

[0019] Furthermore, a fifth control valve and a heat accumulator are sequentially connected in series between the coolant pump and the second heat exchange section along the coolant flow direction;

[0020] A second pipeline is connected between the fifth control valve and the second heat exchange section. The controller is connected to the fifth control valve for communication and controls the working state of the fifth control valve to connect the heat accumulator to or disconnect from the second circuit.

[0021] Furthermore, the heat accumulator is a phase change heat accumulator.

[0022] Furthermore, the heat accumulator is provided with a temperature sensor electrically connected to the controller for collecting the temperature of the phase change energy storage material in the heat accumulator. When the temperature of the phase change energy storage material reaches a threshold value, the controller controls the fifth control valve to change the working state to disconnect the heat accumulator from the second circuit.

[0023] Furthermore, the carbon nanotube deposition layer is provided on both sides of the first fin;

[0024] The fin heat exchanger further includes a second fin without the carbon nanotube deposition layer, and the first fin and the second fin are arranged alternately;

[0025] The infrared light source illuminates the first fin from both sides of the first fin.

[0026] Furthermore, one side of the first fin is provided with the carbon nanotube deposition layer, and the infrared light source irradiates the side of the first fin having the carbon nanotube deposition layer.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] The vehicle air-conditioning system with photothermal defrosting function described in the present invention arranges the first heat exchange system outside the vehicle compartment, and a flammable heat exchange medium such as R290 can be used in the first heat exchange system. The second heat exchange system and the third heat exchange system use conventional non-flammable heat exchange mediums, so that the second heat exchange system can absorb heat from the condenser in the first heat exchange system and send the heat into the vehicle compartment or discharge it through the fin heat exchanger, and the third heat exchange system can also dissipate heat from the first evaporator in the first heat exchange system and absorb heat from the vehicle compartment. While realizing the cooling and heating functions, the flammable heat exchange medium in the first heat exchange system will not enter the vehicle compartment, thereby improving the safety of the vehicle air-conditioning system. At the same time, an infrared light source is arranged to irradiate the fin heat exchanger, which can accelerate the temperature rise of the fin heat exchanger and accelerate defrosting. A carbon nanotube deposition layer is arranged on the surface of the first fin, which can make the first fin have a good frost suppression effect and extremely low adhesion. There is almost no defrost water retention at the end of defrosting, which reduces the frost nucleation point in the next stage, thereby avoiding excessive performance degradation due to frosting under heating conditions.

[0029] Secondly, the control module is provided with a controller capable of controlling the working states of the first control valve, the second control valve, the third control valve and the fourth control valve, so as to facilitate the rapid switching of the cooling state or the heating state of the vehicle air conditioning system. The first pipeline is provided so that the second internal heat exchanger and the fin heat exchanger can be simultaneously disconnected from the second circuit, so that the second internal heat exchanger does not absorb the heat in the vehicle compartment, and the heat of the first heat exchange system is transferred to the fin heat exchanger, so that the fin heat exchanger is heated up and defrosted.

[0030] In addition, the fifth control valve and the heat accumulator are provided, which can store heat when the vehicle air conditioning system is heating, and release heat to the first evaporator during the defrosting process, which can accelerate defrosting and provide heat to the first evaporator, reduce energy consumption, and reduce the temperature fluctuation in the cabin during the defrosting process, thereby improving comfort. The heat accumulator adopts a phase change heat accumulator, which has good thermal stability, low cost, easy to obtain and great plasticity. A temperature sensor is provided, which can automatically disconnect the heat accumulator from the second circuit after the heat storage is completed.

[0031] Furthermore, the first fins and the second fins are alternately arranged, which can reduce the number of first fins and reduce investment costs while having a better defrosting effect. The first fin adopts a method of setting a carbon nanotube deposition layer on one side, which can reduce the number of first fins and reduce investment costs while having a better defrosting effect.

[0032] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the vehicle air conditioning system with the photothermal defrosting function as described above.

[0033] Furthermore, the second evaporator is provided at least at the battery or the motor of the vehicle.

[0034] The vehicle of the present invention, by providing the above-mentioned vehicle air conditioning system, can use a refrigerant such as R290, which is beneficial to the lightweight of the vehicle and the reduction of energy consumption. At the same time, the flammable refrigerant will not enter the vehicle compartment, which has better safety protection and makes the vehicle safer when using the vehicle air conditioning system. The second evaporator is provided at the battery and / or motor of the vehicle, so that the third heat exchange system can cool the battery and / or motor, enriching the function of the vehicle air conditioning system. At the same time, in the heating state, the third heat exchange system can also supply the absorbed heat to the first evaporator to improve the heating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 A schematic diagram of a vehicle air conditioning system according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of a vehicle air conditioning system in a cooling state according to an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a vehicle air conditioning system in a heating state according to an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of a vehicle air conditioning system in a defrosting state according to an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of a fin heat exchanger and an infrared light source according to an embodiment of the present invention;

[0041] Figure 6 It is a schematic diagram of another arrangement of the fin heat exchanger and the infrared light source according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of another arrangement of the fin heat exchanger and infrared light source described in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. The first heat exchange system;

[0045] 101. compressor; 102. condenser; 103. throttle valve; 104. first evaporator;

[0046] 2. The second heat exchange system;

[0047] 201, first heat exchanger; 202, coolant pump; 203, first heat exchange section; 204, third pipeline;

[0048] 3. The third heat exchange system;

[0049] 301, refrigerant pump; 302, second heat exchange section; 303, second evaporator; 304, second internal heat exchanger; 305, heat accumulator; 306, second pipeline;

[0050] 4. Fin heat exchanger; 401. first fin; 4011. carbon nanotube deposition layer; 402. second fin;

[0051] 5. Control module;

[0052] 501, first control valve; 502, second control valve; 503, third control valve; 504, fourth control valve; 505, fifth control valve;

[0053] 6. First pipeline;

[0054] 7. Infrared light source;

[0055] 8. Air duct;

[0056] 9. Air valve. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0058] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0060] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0061] Embodiment 1

[0062] The present embodiment relates to a vehicle air-conditioning system with a photothermal defrosting function, so as to improve the safety of use of the vehicle air-conditioning system.

[0063] In terms of overall structure, a vehicle air conditioning system with a light-heat defrosting function in this embodiment is combined with Figures 1 to 5 As shown, including:

[0064] The first heat exchange system 1 and the fin heat exchanger 4 , the second heat exchange system 2 , the third heat exchange system 3 , the control module 5 and the infrared light source 7 are arranged outside the vehicle compartment.

[0065] The first heat exchange system 1 includes a compressor 101, a condenser 102, a throttle valve 103 and a first evaporator 104 which are connected in sequence to form a closed loop. The second heat exchange system 2 includes a first internal heat exchanger, a coolant pump 202 and a first heat exchange section 203 which are connected in sequence to form a first loop, the first heat exchange section 203 is in contact with the condenser 102 and forms heat transfer, and the first internal heat exchanger is arranged in the air duct 8 of the vehicle compartment. The third heat exchange system 3 includes a refrigerant pump 301, a second heat exchange section 302, a second evaporator 303 which are connected in sequence to form a second loop, and a second internal heat exchanger 304 which is arranged in the air duct 8, and the second heat exchange section 302 is in contact with the first evaporator 104 and forms heat transfer.

[0066] The control module 5 is used to control the fin heat exchanger 4 to be connected to the first circuit or the second circuit, and to control the second internal heat exchanger 304 to be connected to or disconnected from the second circuit. When the vehicle air conditioning system is in the cooling state, the fin heat exchanger 4 is connected to the first circuit and releases heat, and the second internal heat exchanger 304 is connected to the second circuit and absorbs heat. When the vehicle air conditioning system is in the heating state, the fin heat exchanger 4 is connected to the second circuit and absorbs heat, and the second internal heat exchanger 304 is disconnected from the second circuit.

[0067] The fin heat exchanger 4 includes a first fin 401 having a carbon nanotube deposition layer 4011 , and the infrared light source 7 is used to irradiate and heat the first fin 401 .

[0068] As set above, the vehicle air conditioning system of this embodiment sets the first heat exchange system 1 outside the vehicle compartment, and can use flammable heat exchange medium such as R290 in the first heat exchange system 1, and the second heat exchange system 2 and the third heat exchange system 3 use conventional non-flammable heat exchange medium, which can make the second heat exchange system 2 absorb heat from the condenser 102 in the first heat exchange system 1 and send the heat into the vehicle compartment or discharge it through the fin heat exchanger 4, and also make the third heat exchange system 3 dissipate heat from the first evaporator 104 in the first heat exchange system 1 and absorb heat from the vehicle compartment, realizing the cooling and heating functions, while the flammable heat exchange medium in the first heat exchange system 1 will not enter the vehicle compartment, thereby improving the safety of the vehicle air conditioning system. In addition, the first heat exchange system 1 has a simple structure and a short path, which can also reduce the use of flammable refrigerants and further improve the safety of the vehicle system.

[0069] At the same time, the infrared light source 7 is arranged to irradiate the fin heat exchanger 4, which can accelerate the temperature rise of the fin heat exchanger 4 and accelerate defrosting. The carbon nanotube deposition layer 4011 is arranged on the surface of the first fin 401, which can make the first fin 401 have a good frost suppression effect and extremely low adhesion, and the frost layer is easier to peel off in blocks. There is almost no defrost water retention at the end of defrosting, which reduces the frost nucleation point in the next stage, thereby avoiding excessive performance degradation due to frosting under heating conditions.

[0070] Based on the above overall introduction, still refer to Figures 1 to 3 As shown, this embodiment takes the first heat exchange system 1 using R290 as the refrigerant, the second heat exchange system 2 using ethylene glycol solution as the coolant, and the third heat exchange system 3 using ethylene glycol solution as the secondary coolant as an example. Of course, the first heat exchange system 1 also uses other high-pressure explosive refrigerants, such as R32 (difluoromethane), carbon dioxide, etc., which can also correspondingly improve the safety of the air-conditioning system.

[0071] The circuit of the first heat exchange system 1 is compressor 101-condenser 102-throttle valve 103-first evaporator 104-compressor 101. The first heat exchange section 203 is arranged in the condenser 102 to absorb heat from the condenser 102; the second heat exchange section 302 is arranged in the first evaporator 104 to dissipate heat to the first evaporator 104. There is at least one second evaporator 303, which can be arranged at the heat generating components of the vehicle, such as the battery, motor, electronic control device, etc. When multiple second evaporators 303 are arranged, each second evaporator 303 is connected in series. In this embodiment, two second evaporators 303 are arranged. The first heat exchange section 203 and the condenser 102, and the second heat exchange section 302 and the first evaporator 104 are all in the form of countercurrent heat exchange to enhance the heat exchange effect.

[0072] Secondly, the second internal heat exchanger 304 and the first internal heat exchanger are sequentially arranged along the air flow direction in the air duct 8, and the first internal heat exchanger is equipped with an air valve 9. When the air valve 9 is opened, the air in the air duct 8 can directly flow and fully contact the first internal heat exchanger; when the air valve 9 is closed, the air valve 9 can prevent the air from passing through the first internal heat exchanger.

[0073] When the vehicle air conditioning system is in a cooling state, the fin heat exchanger 4 is connected to the first circuit of the second heat exchange system 2. The first circuit is specifically a cycle of coolant pump 202-fin heat exchanger 4-first heat exchange section 203-first internal heat exchanger-coolant pump 202. The first heat exchange section 203 absorbs the heat of the condenser 102, and after passing through the first internal heat exchanger and the coolant pump 202, it is sent to the fin heat exchanger 4 for heat dissipation, and the heat is dissipated to the external environment. After the coolant is cooled by the fin heat exchanger 4, it re-enters the first heat exchange section 203 for heat exchange. At this time, the air valve 9 is closed, and the heat of the first internal heat exchanger is basically not dissipated into the air duct 8.

[0074] At the same time, the second internal heat exchanger 304 is connected to the second circuit of the third heat exchange system 3, and the second circuit is specifically a cycle of the coolant pump 301-the second heat exchange section 302-the second internal heat exchanger 304-the second evaporator 303-the coolant pump 301. The second heat exchange section 302 dissipates and transfers heat to the first evaporator 104, and the temperature of the coolant inside decreases. After entering the second internal heat exchanger 304, it absorbs the heat of the air in the air duct 8, so that cold air is generated in the air duct 8 to achieve cooling of the vehicle compartment. The coolant flowing out of the second internal heat exchanger 304 will enter the two second evaporators 303 in turn, absorb the heat generated by the vehicle components, and cool the vehicle components.

[0075] When the vehicle air conditioning system is in the heating state, the first circuit of the first heat exchange system 1 is specifically a cycle of coolant pump 202-first heat exchanger 201-first internal heat exchanger-coolant pump 202. The air valve 9 is opened, and the coolant in the first circuit absorbs heat from the condenser 102 through the first heat exchange section 203, and then enters the first internal heat exchanger. The air in the air duct 8 contacts the first internal heat exchanger to absorb heat and generate hot air, which can heat the vehicle compartment.

[0076] At the same time, the fin heat exchanger 4 is connected to the second circuit of the third heat exchange system 3, and the second circuit is specifically a cycle of the coolant pump 301-the second heat exchange section 302-the fin heat exchanger 4-the second evaporator 303-the coolant pump 301. After the coolant dissipates heat to the first evaporator 104 through the second heat exchange section 302, it enters the fin heat exchanger 4. At this time, the temperature of the fin heat exchanger 4 will be lower than the external temperature. The fin heat exchanger 4 absorbs heat from the external environment, and the coolant temperature rises. After that, the coolant absorbs heat through the two second evaporators 303, and the temperature rises further. Then, the coolant can be sent to the second heat exchange section 302 by the coolant pump 301 to dissipate heat to the first evaporator 104.

[0077] Regarding the specific structure of the control module 5, the control module 5 of this embodiment includes a first control valve 501 and a second control valve 502 connected in series between the coolant pump 202 and the first heat exchange section 203, a third control valve 503 and a fourth control valve 504 connected in series between the second heat exchange section 302 and the second evaporator 303, and a controller that is communicatively connected to the first control valve 501, the second control valve 502, the third control valve 503, and the fourth control valve 504, respectively.

[0078] The fin heat exchanger 4 is connected between the first control valve 501 and the second control valve 502, and a third pipe 204 is connected between the first control valve 501 and the second control valve 502. The controller controls the working state of the first control valve 501 and the second control valve 502 to connect or disconnect the fin heat exchanger 4 to the first circuit. The second internal heat exchanger 304 is connected between the third control valve 503 and the fourth control valve 504, and the fin heat exchanger 4 is connected between the third control valve 503 and the fourth control valve 504. The controller controls the working state of the third control valve 503 and the fourth control valve 504 to connect the fin heat exchanger 4 or the second internal heat exchanger 304 to the second circuit. The control module 5 is provided with a controller capable of controlling the working state of the first control valve 501, the second control valve 502, the third control valve 503 and the fourth control valve 504, so as to facilitate the rapid switching of the cooling state or the heating state of the vehicle air conditioning system.

[0079] Specifically, the first control valve 501 is connected between the coolant pump 202 and the fin heat exchanger 4, and the second control valve 502 is connected between the fin heat exchanger 4 and the first heat exchange section 203. The first control valve 501 and the second control valve 502 are three-way valves. In addition, the controller is also connected to the air valve 9 through communication, and can control the opening and closing of the air valve 9 to adapt to different working states of the vehicle air conditioning system.

[0080] It should be noted that when the vehicle air-conditioning system is in the heating state and the external ambient temperature is low, frost may form on the fin heat exchanger 4 because the temperature of the fin heat exchanger 4 is lower than the ambient temperature, and the fin heat exchanger 4 needs to be defrosted.

[0081] Therefore, in order to meet the defrosting requirements, refer to Figure 4As shown, the vehicle air conditioning system also has a defrosting state, and a first pipe 6 is connected between the third control valve 503 and the fourth control valve 504. When the vehicle air conditioning system is in the defrosting state, the first pipe 6 is in a conducting state, the second internal heat exchanger 304 and the fin heat exchanger 4 are disconnected from the second circuit, and the fin heat exchanger 4 is connected to the first circuit and releases heat. The first pipe 6 is provided to enable the second internal heat exchanger 304 and the fin heat exchanger 4 to be disconnected from the second circuit at the same time, so that the second internal heat exchanger 304 will not absorb the heat in the vehicle compartment, and the heat of the first heat exchange system 1 is transferred to the fin heat exchanger 4, so that the fin heat exchanger 4 is heated up and defrosted. At this time, the air valve 9 is closed, and the coolant in the first circuit absorbs the heat of the condenser 102 through the first heat exchange section 203, and then enters the fin heat exchanger 4 through the first internal heat exchanger and the coolant pump 202, so that the fin heat exchanger 4 is heated up to melt the frost on its surface, thereby achieving the defrosting effect.

[0082] Specifically, in this embodiment, the third control valve 503 is arranged between the second heat exchange section 302 and the second internal heat exchanger 304, and the fourth control valve 504 is arranged between the second internal heat exchanger 304 and the second evaporator 303. The third control valve 503 and the fourth control valve 504 are four-way valves.

[0083] Furthermore, in order to make the defrosting process more stable, a fifth control valve 505 and a heat accumulator 305 are connected in series along the flow direction of the refrigerant between the refrigerant pump 301 and the second heat exchange section 302. A second pipe 306 is connected between the fifth control valve 505 and the second heat exchange section 302. The controller communicates with the fifth control valve 505 and controls the working state of the fifth control valve 505 so that the heat accumulator 305 is connected to or disconnected from the second circuit. The fifth control valve 505 and the heat accumulator 305 are provided to store heat when the vehicle air conditioning system is heating, and release heat to the first evaporator 104 during the defrosting process, which can accelerate defrosting and provide heat to the first evaporator 104, reduce energy consumption, and reduce the temperature fluctuation in the cabin during the defrosting process, thereby improving comfort. Among them, the fifth control valve 505 adopts a three-way valve.

[0084] Specifically, the heat accumulator 305 of this embodiment adopts a phase change heat accumulator. The heat accumulator 305 adopts a phase change heat accumulator, which has good thermal stability, low cost, easy to obtain and great plasticity. Preferably, the phase change energy storage material of the heat accumulator 305 adopts paraffin, which usually has a melting point between 47 and 64°C. Paraffin has a large latent heat of phase change, good thermal stability, low cost, easy to obtain and great plasticity, and is easy to fill in the heat accumulator 305.

[0085] Regarding the specific way of connecting and disconnecting the heat accumulator 305 from the second circuit, in this embodiment, a temperature sensor electrically connected to the controller is provided on the heat accumulator 305, which is used to collect the temperature of the phase-change energy storage material in the heat accumulator 305. When the temperature of the phase-change energy storage material reaches the threshold, the controller controls the fifth control valve 505 to change the working state so that the heat accumulator 305 is disconnected from the second circuit. Specifically, the temperature sensor of this embodiment adopts a contact type, which is in contact with the paraffin in the heat accumulator 305, and the temperature threshold is 52°C, that is, when the temperature detected by the temperature sensor reaches 52°C, an electrical signal is output to the controller, and the controller controls the fifth control valve 505 to change the working state, so that the second pipeline 306 is turned on, and the heat accumulator 305 is disconnected from the second circuit.

[0086] In addition, the fin heat exchanger 4 of this embodiment is provided with a plurality of first fins 401 arranged at equal intervals. The first fins 401 are arranged vertically and provided with carbon nanotube deposition layers 4011 on both sides thereof. The infrared light source 7 is enabled only in the defrosting state and can be arranged, for example, above the first fin 401. The light emitted by the infrared light source 7 is incident on the surface of the first fin 401 at a certain angle to quickly heat up the surface, thereby achieving a high defrosting efficiency. The incident angle of the infrared light source 7 irradiating the first fin 401 can be adjusted according to the frosting condition on the surface of the first fin 401 and the surface spacing of the first fin 401. When actually testing the first fin 401, the infrared light source 7 is set to 0.2W / m 2 With the red illumination intensity, the surface temperature of the first fin 401 can rise by about 25° C. within 600 seconds, showing a good photothermal effect.

[0087] Specifically, the first fin 401 uses an aluminum sheet as a substrate, and adopts a composite processing method of laser processing and fluorinated modified carbon nanotube electroplating to obtain a super-hydrophobic aluminum-based carbon nanotube deposition layer 4011 with a photothermal effect. The micro-nano structure of the aluminum substrate after laser processing is more conducive to the subsequent deposition of fluorinated carbon nanotubes, so as to obtain a more durable photothermal super-hydrophobic surface.

[0088] The vehicle air conditioning system of this embodiment sets the first heat exchange system 1 outside the vehicle compartment. Inflammable heat exchange medium such as R290 can be used in the first heat exchange system 1. The second heat exchange system 2 and the third heat exchange system 3 use conventional non-flammable heat exchange medium. While achieving the cooling and heating functions, the inflammable heat exchange medium in the first heat exchange system 1 will not enter the vehicle compartment, thereby improving the safety of the vehicle air conditioning system. Through the control of the control module 5, the working state conversion of the vehicle air conditioning system can be realized more conveniently and the operation is stable. At the same time, the infrared light source 7 is set and the carbon nanotube deposition layer 4011 is set on the first fin 401 of the fin heat exchanger 4, which can improve the defrosting effect of the fin heat exchanger 4 and improve the use quality of the vehicle air conditioning system.

[0089] Embodiment 2

[0090] This embodiment relates to a vehicle air conditioning system with a photothermal defrosting function, which is different from the first embodiment in that the fin heat exchanger 4 further includes a second fin 402 without a carbon nanotube deposition layer 4011, and the first fin 401 and the second fin 402 are arranged alternately. The infrared light source 7 irradiates the first fin 401 from both sides of the first fin 401. Exemplarily, the second fin 402 of this embodiment is a bare aluminum surface fin.

[0091] With such arrangement, the bare aluminum surface of the second fin 402 is hydrophilic, and the surface of the first fin 401 is super-hydrophobic. The infrared light source 7 can be arranged above the first fin 401 to irradiate both sides of the first fin 401. Under the photothermal effect, the frost layer on the surface of the first fin 401 melts first, and only small-sized spherical droplets are retained after the defrosting is completed, and the maximum radius of these droplets is only about 0.35 mm. After that, the frost layer on the surface of the second fin 402 begins to melt, and the defrosted water will be discharged from the surface of the second fin 402 in the form of a liquid film. Because the fin spacing of the fin heat exchanger 4 is usually small, during the downward movement of the liquid film on the second fin 402, the bottom end of the liquid film contacts the small-sized droplets retained on the surface side of the adjacent carbon nanotube deposition layer 4011. Under the action of the surface tension of the liquid, the retained small droplets are completely absorbed by the downward-moving liquid film and taken away from the channel, which also avoids the blockage of the flow channel caused by the liquid bridge between the fins.

[0092] The arrangement of the fins in this embodiment reduces the number of first fins 401, and reduces the investment cost of modifying the fin surface with the carbon nanotube deposition layer 4011. At the same time, the infrared light source 7 only needs to irradiate the first fin 401, which also reduces the irradiation power of the infrared light source 7. When the fin heat exchanger 4 has a good defrosting efficiency, it reduces the energy waste in the defrosting process.

[0093] Embodiment 3

[0094] This embodiment relates to a vehicle air-conditioning system with a photothermal defrosting function. The difference from the first embodiment is that a carbon nanotube deposition layer 4011 is provided on one side of the first fin 401, and the other side is a hydrophilic bare aluminum surface. An infrared light source irradiates the side of the first fin 401 with the carbon nanotube deposition layer 4011.

[0095] Based on the above scheme, under the photothermal effect, the frost layer on one side of the carbon nanotube deposition layer 4011 of the first fin 401 melts first, and only small-sized spherical droplets remain at the end of defrosting, and the maximum radius of these droplets is only about 0.35 mm. After that, the frost layer on the bare aluminum surface of the first fin 401 begins to melt, and the defrosted water will be discharged downward in the form of a liquid film. Because the fin spacing of the fin heat exchanger 4 is usually small, during the downward movement of the liquid film, the bottom end of the liquid film contacts the small-sized droplets retained on the surface side of the carbon nanotube deposition layer 4011 of the adjacent first fin 401. Under the action of the surface tension of the liquid, the retained small droplets are completely absorbed by the downwardly moving liquid film and taken away from the channel, which also avoids the blockage of the flow channel caused by the liquid bridge between the first fins 401.

[0096] By adopting the arrangement of the first fin 401 of the present embodiment, only one side of the first fin 401 needs to be modified with the carbon nanotube deposition layer 4011 during the specific implementation, thereby reducing the investment cost of the modification of the fin 4011. The heat conduction of the first fin 401 is used to accelerate the defrosting process on both sides, and the infrared light source 7 only needs to irradiate the carbon nanotube deposition layer 4011 side of the first fin 401, thereby reducing the irradiation power of the infrared light source 7. When the fin heat exchanger 4 has a good defrosting efficiency, the energy waste in the defrosting process is reduced.

[0097] Embodiment 4

[0098] This embodiment relates to a vehicle, on which is provided the vehicle air-conditioning system with the photothermal defrosting function in the first embodiment.

[0099] By setting up the vehicle air-conditioning system with the photothermal defrost function of the first embodiment, a refrigerant such as R290 can be used, which is beneficial to the lightweight of the vehicle and reduces energy consumption. At the same time, the flammable refrigerant will not enter the vehicle compartment, which has better safety protection and makes the vehicle safer when using the vehicle air-conditioning system.

[0100] Secondly, the vehicle of this embodiment is provided with a second evaporator 303 at least at the battery or the motor, which enables the third heat exchange system 3 to cool the battery and / or the motor, enriching the function of the vehicle air conditioning system. At the same time, in the heating state, the third heat exchange system 3 can also supply the absorbed heat to the first evaporator 104 to improve the heating stability. Specifically, the two second evaporators 303 of this embodiment are respectively arranged at the battery and the motor. In the cooling state, the vehicle air conditioning system can assist in cooling the battery and the motor; in the heating state, it can use the excess heat of the battery and the motor to supply the first evaporator 104, improve the electric energy utilization rate of the vehicle, and be more environmentally friendly.

[0101] The provision of the infrared light source 7 and the fin 401 having the carbon nanotube deposition layer 4011 can enhance the defrosting effect of the fin heat exchanger 4 and improve the use quality of the vehicle air conditioning system.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle air conditioning system with a photothermal defrosting function, characterized in that: include: A first heat exchange system (1) and a fin heat exchanger (4), a second heat exchange system (2), a third heat exchange system (3), a control module (5), and an infrared light source (7) arranged outside the vehicle compartment; The first heat exchange system (1) comprises a compressor (101), a condenser (102), a throttle valve (103) and a first evaporator (104) which are connected in sequence to form a closed loop; The second heat exchange system (2) comprises a first internal heat exchanger, a coolant pump (202) and a first heat exchange section (203) which are connected in sequence and form a first loop, the first heat exchange section (203) is in contact with the condenser (102) and forms heat transfer, and the first internal heat exchanger is arranged in the air duct (8) of the vehicle compartment; The third heat exchange system (3) comprises a refrigerant pump (301), a second heat exchange section (302), a second evaporator (303), and a second internal heat exchanger (304) arranged in the air duct (8), which are sequentially connected to form a second loop, and the second heat exchange section (302) is in contact with the first evaporator (104) to form heat transfer; The control module (5) is used to control the fin heat exchanger (4) to be connected to the first circuit or the second circuit, and to control the second internal heat exchanger (304) to be connected to or disconnected from the second circuit; when the vehicle air conditioning system is in a cooling state, the fin heat exchanger (4) is connected to the first circuit and releases heat, and the second internal heat exchanger (304) is connected to the second circuit and absorbs heat; when the vehicle air conditioning system is in a heating state, the fin heat exchanger (4) is connected to the second circuit and absorbs heat, and the second internal heat exchanger (304) is disconnected from the second circuit; The fin heat exchanger (4) comprises a first fin (401) having a carbon nanotube deposition layer (4011), and the infrared light source (7) is used to irradiate and heat the first fin (401).

2. The vehicle air conditioning system with light-heat defrosting function according to claim 1, characterized in that: The control module (5) comprises a first control valve (501) and a second control valve (502) connected in series between the coolant pump (202) and the first heat exchange section (203), a third control valve (503) and a fourth control valve (504) connected in series between the second heat exchange section (302) and the second evaporator (303), and a controller connected in communication with the first control valve (501), the second control valve (502), the third control valve (503), and the fourth control valve (504), respectively; The fin heat exchanger (4) is connected between the first control valve (501) and the second control valve (502), and a third pipeline (204) is connected between the first control valve (501) and the second control valve (502); the controller controls the working states of the first control valve (501) and the second control valve (502) so as to connect the fin heat exchanger (4) to or disconnect from the first circuit; The second internal heat exchanger (304) is connected between the third control valve (503) and the fourth control valve (504), and the fin heat exchanger (4) is connected between the third control valve (503) and the fourth control valve (504); the controller controls the working state of the third control valve (503) and the fourth control valve (504) so ​​that the fin heat exchanger (4) or the second internal heat exchanger (304) is connected to the second circuit.

3. The vehicle air conditioning system with light-heat defrosting function according to claim 2, characterized in that: A first pipeline (6) is connected between the third control valve (503) and the fourth control valve (504); The vehicle air conditioning system also has a defrost state; when the vehicle air conditioning system is in the defrost state, the first pipe (6) is in a conducting state, the second internal heat exchanger (304) and the fin heat exchanger (4) are disconnected from the second circuit, and the fin heat exchanger (4) is connected to the first circuit and releases heat.

4. The vehicle air conditioning system with light-heat defrosting function according to claim 3, characterized in that: A fifth control valve (505) and a heat accumulator (305) are sequentially connected in series between the brine pump (301) and the second heat exchange section (302) along the brine flow direction; A second pipeline (306) is connected between the fifth control valve (505) and the second heat exchange section (302), and the controller is connected to the fifth control valve (505) in communication and controls the working state of the fifth control valve (505) so as to connect the heat accumulator (305) to or disconnect from the second circuit.

5. The vehicle air conditioning system with light-heat defrosting function according to claim 4, characterized in that: The heat accumulator (305) is a phase change heat accumulator.

6. The vehicle air conditioning system with light-heat defrosting function according to claim 5, characterized in that: The heat accumulator (305) is provided with a temperature sensor electrically connected to the controller, and is used to collect the temperature of the phase-change energy storage material in the heat accumulator (305). When the temperature of the phase-change energy storage material reaches a threshold value, the controller controls the fifth control valve (505) to change the working state so that the heat accumulator (305) is disconnected from the second circuit.

7. The vehicle air conditioning system with light-heat defrosting function according to claim 1, characterized in that: The carbon nanotube deposition layer (4011) is provided on both sides of the first fin (401); The fin heat exchanger (4) further comprises a second fin (402) not having the carbon nanotube deposition layer (4011), and the first fin (401) and the second fin (402) are arranged alternately; The infrared light source (7) illuminates the first fin from both sides of the first fin (401).

8. The vehicle air conditioning system with light-heat defrosting function according to claim 1, characterized in that: The carbon nanotube deposition layer (4011) is provided on one side of the first fin (401), and the infrared light source (7) irradiates the side of the first fin (401) having the carbon nanotube deposition layer (4011).

9. A vehicle, characterized in that: The vehicle is provided with the vehicle air conditioning system with a photothermal defrosting function according to any one of claims 1 to 8.

10. The vehicle according to claim 9, characterized in that: The second evaporator (303) is provided at least at the battery or the motor of the vehicle.

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