Air conditioning system, automobile

Abstract

The present invention provides an air conditioning system and an automobile, wherein the air conditioning system includes: when the air conditioning system operates in a cooling mode and the evaporator group needs to be self-cleaned, in a parallel state, either a first evaporator or a second evaporator is controlled to be frosted, and after the corresponding evaporator is frosted, the evaporator group is controlled to switch to a series state, so that the refrigerant flowing out of the condenser flows into the frosted one of the first and second evaporators to defrost. According to the present invention, when defrosting is required, the evaporator group is controlled to switch from a parallel state to a series state, so that the refrigerant flowing out of the condenser first enters the frosted evaporator for defrosting, and the frost layer melts into water to perform a cleaning function. The refrigerant then enters the throttling element from the frosted evaporator for throttling and pressure reduction, and finally flows into the unfrosted evaporator to evaporate, absorb heat, and generate cooling energy. The cooling energy is blown toward the cab via the evaporating fan, thereby achieving normal cooling during the self-cleaning of the heat exchanger of the air conditioning system.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning system and a car. Background Art

[0002] The heat exchanger is a crucial component of an air conditioning system, and its heat exchange efficiency directly impacts its performance. In actual use, due to the fins' constant contact with air and the small spacing between them, dust and debris easily accumulate on the fins as the filter's filtration capacity decreases. This ultimately leads to reduced heat exchange performance, poor air conditioning, and odorous airflow. Therefore, regular cleaning of the heat exchanger is essential. For automotive air conditioning systems, manual cleaning of the heat exchanger is difficult, complex, and incomplete due to the specific installation and environment. This has led to the emergence of self-cleaning technologies that rely solely on the air conditioner's own functions. Existing self-cleaning technologies for heat exchangers primarily involve frosting the heat exchanger surface during operation. Once the frost reaches a certain level, the heat exchanger is defrosted, allowing the defrost water to flush the surface, thereby cleaning the heat exchanger. However, most self-cleaning systems require entering their own independent self-cleaning program. When entering the defrost stage of self-cleaning, normal refrigeration cannot be taken into account, thus failing to meet the refrigeration needs of car users. Summary of the Invention

[0003] Therefore, the present invention provides an air-conditioning system that can overcome the deficiency of existing air-conditioning systems that cannot take into account normal cooling when performing self-cleaning of the heat exchanger, thereby failing to meet the cooling needs of automobile users.

[0004] In order to solve the above problems, the present invention provides an air-conditioning system, comprising: an evaporator group, a condenser, the evaporator group comprising a first evaporator, a second evaporator and a throttling element, the evaporator group having a parallel state and a series state, in the parallel state, the refrigerant flowing out of the condenser is throttled by the throttling element and then flows into the first evaporator and the second evaporator in parallel, in the series state, the refrigerant flowing out of the condenser flows into one of the first evaporator and the second evaporator and then flows into the other of the first evaporator and the second evaporator after throttling by the throttling element, when the air-conditioning system operates in a cooling mode and the evaporator group needs to be self-cleaned, in the parallel state, the first evaporator is controlled to frost, and after the first evaporator is frosted, the evaporator group is controlled to switch from the parallel state to the series state, so that the refrigerant flowing out of the condenser flows into the first evaporator to achieve defrosting of the first evaporator.

[0005] In some embodiments, after the first evaporator is defrosted, the evaporator group is controlled to switch from the series state to the parallel state, and in the parallel state, the second evaporator is controlled to frost. After the second evaporator is frosted, the evaporator group is controlled to switch from the parallel state to the series state, so that the refrigerant flowing out of the condenser flows into the second evaporator to achieve defrosting of the second evaporator.

[0006] In some embodiments, after the second evaporator is defrosted, the evaporator group is controlled to switch from the series state to the parallel state.

[0007] In some embodiments, a damper and an evaporating fan are further included, and the damper has a first position, a second position and a third position respectively. When the damper is in the first position, the damper can block the first evaporator so that the airflow generated when the evaporating fan is running only passes through the second evaporator; when the damper is in the second position, the damper can block the second evaporator so that the airflow generated when the evaporating fan is running only passes through the first evaporator; when the damper is in the third position, the airflow generated when the evaporating fan is running flows through the first evaporator and the second evaporator at the same time.

[0008] In some embodiments, the damper is located in the area between the first evaporator and the second evaporator, and the damper can be controlled to rotate about the first end of the damper as the axis, and the rotation of the damper enables the damper to switch between the first position, the second position and the third position.

[0009] In some embodiments, the first evaporator and the second evaporator are arranged in a V shape, and the first end of the damper is located at the junction of the first evaporator and the second evaporator. When the damper rotates to a limit position at the first evaporator, it is in the first position, and when the damper rotates to a limit position at the second evaporator, it is in the second position.

[0010] In some embodiments, a first evaporation fan and a second evaporation fan are further included, wherein the first evaporation fan is used to independently drive the airflow of the first evaporator, and the second evaporation fan is used to independently drive the airflow of the second evaporator.

[0011] In some embodiments, the invention further includes a first branch, a second branch, a third branch, a fourth branch, a main flow path and a pipeline switching component, wherein the pipeline switching component has a first port, a second port, a third port and a fourth port, the first end of the first branch is connected to the first port, the first end of the second branch is connected to the second port, the first end of the third branch is connected to the third port, the first end of the main flow path is connected to the fourth port, the second ends of the first branch and the second branch are both connected to the second end of the main flow path, the condenser and the throttling element are both arranged on the main flow path, and the throttling element is located between the condenser and the second end of the main flow path, a compressor is further provided on the main flow path, and the compressor is located between the condenser and the first end of the main flow path, and the first evaporator is provided The first branch is provided with a first stop valve, the first stop valve is located between the second end of the first branch and the first evaporator, the second evaporator is located on the second branch, and the main flow is further provided with a fourth stop valve, the fourth stop valve is located between the throttling element and the condenser, the second end of the third branch is connected to the main flow, and the second end of the third branch is located between the fourth stop valve and the condenser, the third branch is provided with a third stop valve, the first end of the fourth branch is connected to the first branch, and the first end of the fourth branch is located between the first evaporator and the first stop valve, the second end of the fourth branch is connected to the main flow, and the second end of the fourth branch is located between the throttling element and the fourth stop valve.

[0012] In some embodiments, the pipeline switching component is a four-way valve, which has a first state. When the four-way valve is in the first state, the first port, the second port, and the fourth port are interconnected in the four-way valve.

[0013] In some embodiments, the four-way valve further has a second state. When the four-way valve is in the second state, the first port and the third port are in communication within the four-way valve, and the second port and the fourth port are in communication within the four-way valve.

[0014] In some embodiments, a first one-way valve is provided on the fourth branch.

[0015] In some embodiments, the second branch is further provided with a second stop valve, which is located between the second end of the second branch and the second evaporator, and also includes a fifth branch, the first end of the fifth branch is connected to the second branch, and the first end of the fifth branch is located between the second evaporator and the second stop valve, the second end of the fifth branch is connected to the main flow, and the second end of the fifth branch is located between the throttling element and the fourth stop valve.

[0016] In some embodiments, the four-way valve further has a third state. When the four-way valve is in the third state, the second port and the third port are communicated in the four-way valve, and the first port and the fourth port are communicated in the four-way valve.

[0017] In some embodiments, a second one-way valve is provided on the fifth branch.

[0018] The present invention also provides a car comprising the above-mentioned air-conditioning system.

[0019] The present invention provides an air conditioning system and a vehicle. When the air conditioning system operates in cooling mode and the evaporator group needs to self-clean, the evaporator groups are first controlled to be in a parallel state. The refrigerant flowing out of the condenser is throttled and reduced in pressure by a throttling element and then flows in parallel into a first evaporator and a second evaporator. The second evaporator operates normally while the first evaporator is controlled to frost, thereby ensuring that the air conditioning system can operate normally during the frosting stage. Next, the evaporator groups are controlled to switch from the parallel state to a series state. The refrigerant flowing out of the condenser directly enters the frosted first evaporator. After heat exchange with the frost layer on the evaporator surface, the frost layer melts into water, which acts as a cleansing agent, thereby achieving the purpose of self-cleaning. The refrigerant then flows from the first evaporator into the throttling element. The throttled and reduced-pressure refrigerant flows into the second evaporator, where it evaporates, absorbs heat, and generates cooling energy. The cooling energy is blown toward the driver's cab via an evaporating fan, ultimately ensuring that the air conditioning system maintains normal cooling even during defrosting and cleaning. Therefore, the air conditioning system can maintain normal cooling throughout the self-cleaning process, thereby meeting the cooling needs of the vehicle user. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a first evaporator of an air-conditioning system in a frosted state according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a second evaporator of an air-conditioning system in a frosted state according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of a first evaporator of an air-conditioning system in a defrosting state according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a second evaporator of an air-conditioning system in a defrosting state according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a first evaporator and a second evaporator of an air-conditioning system according to an embodiment of the present invention both being in a normal cooling state;

[0025] Figure 6This is a structural schematic diagram of an HVAC assembly of an air-conditioning system according to an embodiment of the present invention when the damper is in a first position;

[0026] Figure 7 This is a schematic structural diagram of an HVAC assembly of an air-conditioning system according to an embodiment of the present invention when the damper is in a second position;

[0027] Figure 8 Schematic diagram of the structure of the HVAC assembly of the air conditioning system according to an embodiment of the present invention when the damper is in the third position;

[0028] Figure 9 This is a structural schematic diagram of a four-way valve of an air-conditioning system according to an embodiment of the present invention when it is in a first state;

[0029] Figure 10 This is a structural schematic diagram of a four-way valve of an air-conditioning system according to an embodiment of the present invention when it is in a second state;

[0030] Figure 11 This is a structural diagram of the four-way valve of the air-conditioning system according to an embodiment of the present invention when it is in the third state.

[0031] The reference numerals indicate:

[0032] 1. First evaporator; 2. Second evaporator; 3. Evaporating fan; 4. Damper; 5. First branch; 6. Second branch; 7. Main branch; 8. Throttle element; 9. First stop valve; 10. Second stop valve; 11. Third branch; 12. Fourth branch; 13. Third stop valve; 14. Fourth stop valve; 15. First check valve; 16. Fifth branch; 17. Second check valve; 18. Pipeline switching component; 181. First port; 182. Second port; 183. Third port; 184. Fourth port; 19. Third check valve; 20. Compressor; 21. Fourth check valve; 22. Condenser; 23. Condensing fan; 24. HVAC assembly; 25. Rotating shaft. DETAILED DESCRIPTION

[0033] See also Figures 1 to 11As shown, according to an embodiment of the present invention, an air conditioning system is provided, comprising: an evaporator group and a condenser 22. The evaporator group includes a first evaporator 1, a second evaporator 2, and a throttling element 8. The evaporator group has a parallel state and a series state. In the parallel state, the refrigerant flowing out of the condenser 22 is throttled by the throttling element 8 and then flows into the first evaporator 1 and the second evaporator 2 in parallel. In the series state, the refrigerant flowing out of the condenser 22 flows into one of the first evaporator 1 and the second evaporator 2 and then throttled by the throttling element 8 and then flows into the other of the first evaporator 1 and the second evaporator 2. When the air conditioning system operates in cooling mode and the evaporator group needs to be self-cleaned, in the parallel state, the first evaporator 1 is controlled to frost. After the first evaporator 1 is frosted, the evaporator group is controlled to switch from the parallel state to the series state so that the refrigerant flowing out of the condenser 22 flows into the first evaporator 1 to defrost the first evaporator 1. In this technical solution, the air conditioning system of the present application can perform evaporator self-cleaning under normal cooling conditions, which is very suitable for vehicle use. When the air conditioning system operates in cooling mode and the evaporator group requires self-cleaning, the evaporator groups are first controlled to operate in parallel. The refrigerant flowing from the condenser 22 is throttled and depressurized by the throttling element 8 and then flows in parallel into the first evaporator 1 and the second evaporator 2. The second evaporator 2 operates normally while the first evaporator 1 is controlled to frost. This ensures that the air conditioning system can operate normally during the frosting phase. Next, the evaporator groups are controlled to switch from parallel to series operation. The refrigerant flowing from the condenser 22 directly enters the frosted first evaporator 1. After heat exchange with the frost layer on the evaporator surface, the frost melts into water, which acts as a cleansing agent, thereby achieving the self-cleaning purpose. The refrigerant then flows from the first evaporator 1 into the throttling element 8. After throttling and depressurizing, the refrigerant flows into the second evaporator 2, where it evaporates and absorbs heat to generate cooling energy. This cooling energy is then blown toward the driver's cabin by the evaporator fan 3. Ultimately, the air conditioning system maintains normal cooling even during defrosting and cleaning. This ensures that the air conditioning system maintains normal cooling throughout the evaporator self-cleaning process, thereby meeting the cooling needs of the vehicle user.

[0034] Specifically, after the first evaporator 1 is defrosted, the evaporator group is controlled to switch from a series state to a parallel state, and in the parallel state, the second evaporator 2 is controlled to frost. After the second evaporator 2 is frosted, the evaporator group is controlled to switch from a parallel state to a series state, so that the refrigerant flowing out of the condenser 22 flows into the second evaporator 2 to realize the defrosting of the second evaporator 2.

[0035] In this embodiment, when the first evaporator 1 is defrosted, it indicates that the self-cleaning of the first evaporator 1 has ended, and the second evaporator 2 needs to be self-cleaned next. First, the evaporator group is controlled to switch from a series state to a parallel state. The refrigerant flowing out of the condenser 22 is throttled and reduced in pressure by the throttling element 8 and then flows into the first evaporator 1 and the second evaporator 2 in parallel. The first evaporator 1 is cooled normally, and the second evaporator 2 is controlled to frost. This ensures that the air conditioning system can perform normal cooling during the frosting stage. Next, the evaporator group is controlled to switch from a parallel state to a series state. The refrigerant flowing out of the condenser 22 directly enters the frosted second evaporator 2. After the refrigerant exchanges heat with the frost layer on the evaporator surface, the frost layer melts into water, which has a cleaning effect, thereby achieving the purpose of self-cleaning. The refrigerant then flows from the second evaporator 2 into the throttling element 8. After throttling and reducing the pressure, the refrigerant flows into the first evaporator 1 to evaporate, absorb heat and generate cold energy. The cold energy is blown toward the cab through the evaporating fan 3. Ultimately, the air-conditioning system can maintain normal cooling even when the second evaporator 2 is self-cleaning, thereby meeting the cooling needs of car users.

[0036] As a specific embodiment, after the second evaporator 2 is defrosted, the evaporator group is controlled to switch from a series state to a parallel state. When the second evaporator 2 is defrosted, it marks the end of the entire self-cleaning process. Next, the evaporator group needs to be controlled to switch from a series state to a parallel state. The first evaporator 1 and the second evaporator 2 both participate in the cooling of the system, thereby putting the air conditioning system into a high-efficiency cooling mode.

[0037] Specifically, the air conditioner further includes a damper 4 and an evaporating fan 3. The damper 4 has a first position, a second position, and a third position. When the damper 4 is in the first position, the damper 4 blocks the first evaporator 1, so that the airflow generated by the evaporating fan 3 passes only through the second evaporator 2. When the damper 4 is in the second position, the damper 4 blocks the second evaporator 2, so that the airflow generated by the evaporating fan 3 passes only through the first evaporator 1. When the damper 4 is in the third position, the airflow generated by the evaporating fan 3 passes through both the first evaporator 1 and the second evaporator 2. The damper 4 is further provided to facilitate or accelerate frosting when the first or second evaporator 1 or 2 enters the self-cleaning frosting stage. When the damper 4 blocks the first or second evaporator 1 or 2, the blocked evaporator cannot fully exchange heat with the circulating air generated by the evaporating fan 3, thereby facilitating or accelerating frosting of the blocked evaporator. When the damper 4 is in the third position, the airflow generated by the operation of the evaporating fan 3 flows through the first evaporator 1 and the second evaporator 2 at the same time, and the air-conditioning system enters the high-efficiency cooling mode.

[0038] In a specific embodiment, the damper 4 is located between the first evaporator 1 and the second evaporator 2. The damper 4 can be controlled to rotate about the first end of the damper 4. The rotation of the damper 4 switches the damper 4 between the first position, the second position, and the third position. The damper 4 can simply be rotated left or right to block the first evaporator 1 or the second evaporator 2. This design is convenient and practical.

[0039] See also Figures 6 to 8 As shown, the first evaporator 1 and the second evaporator 2 are arranged in a V-shape. The first end of the damper 4 is located at the junction of the first and second evaporators 1 and 2. When the damper 4 rotates to its limit position at the first evaporator 1, it is in the first position; when the damper 4 rotates to its limit position at the second evaporator 2, it is in the second position. The first evaporator 1, the second evaporator 2, and the damper 4 constitute an HVAC assembly 24. A rotating shaft 25 is mounted on the first end of the damper 4. Rotation of the damper 4 is achieved by a motor driving the rotating shaft 25. Because the first and second evaporators 1 and 2 are arranged in a V-shape, when the damper 4 rotates to the first position to block the first evaporator 1, or when the damper 4 rotates to the second position to block the second evaporator 2, the gap between the damper 4 and the first or second evaporator 1 or 2 is small or even non-existent. This allows the damper 4 to more tightly block the first or second evaporator 1 or 2, thereby facilitating or accelerating frosting on the first or second evaporator 1 or 2. Figure 8 The damper 4 is shown in the third position. At this time, the first evaporator 1 and the second evaporator 2 are symmetrical with respect to the damper 4, and the evaporating fan 3 is directly opposite the damper 4. When the air conditioning system is cooling normally and the damper 4 is in the third position, the airflow generated by the evaporating fan 3 is evenly distributed through the first evaporator 1 and the second evaporator 2, and the first evaporator 1 and the second evaporator 2 participate in the cooling of the system in the same state. The first evaporator 1 and the second evaporator 2 are both rectangular structures. The first evaporator 1 and the second evaporator 2 both have a first side facing the damper 4, and the shape and size of the first side match the shape and size of the damper 4. In this way, the size of the damper 4 is minimized while the damper 4 effectively blocks the first evaporator 1 and the second evaporator 2, which helps save the required installation space.

[0040] As a specific embodiment, the system further includes a first evaporation fan and a second evaporation fan. The first evaporation fan is used to independently drive airflow to the first evaporator 1, and the second evaporation fan is used to independently drive airflow to the second evaporator 2. When the first evaporator 1 or the second evaporator 2 enters the self-cleaning frosting stage, the first evaporation fan or the second evaporation fan can be controlled to stop operation, thereby ensuring smooth or accelerated frosting of the first evaporator 1 or the second evaporator 2. The provision of the first and second evaporation fans can replace the solution of the evaporation fan 3 and the damper 4.

[0041] Specifically, it also includes a first branch 5, a second branch 6, a third branch 11, a fourth branch 12, a main flow path 7 and a pipeline switching component 18. The pipeline switching component 18 has a first port 181, a second port 182, a third port 183 and a fourth port 184. The first end of the first branch 5 is connected to the first port 181, the first end of the second branch 6 is connected to the second port 182, the first end of the third branch 11 is connected to the third port 183, the first end of the main flow path 7 is connected to the fourth port 184, and the second ends of the first branch 5 and the second branch 6 are both connected to the second end of the main flow path 7. The condenser 22 and the throttling element 8 are both arranged on the main flow path 7, and the throttling element 8 is located between the condenser 22 and the second end of the main flow path 7. A compressor 20 and a fourth one-way valve 21 are also provided on the main flow path 7. The compressor 20 is located between the condenser 22 and the first end of the main flow path 7, and the fourth one-way valve 21 is located between the compressor 20 and the condenser 22. The first evaporator 1 is disposed on the first branch 5, which is also provided with a first stop valve 9 located between the second end of the first branch 5 and the first evaporator 1. The second evaporator 2 is disposed on the second branch 6, and a fourth stop valve 14 is further provided on the main flow path 7, located between the throttling element 8 and the condenser 22. The second end of the third branch 11 is connected to the main flow path 7, and the second end of the third branch 11 is located between the fourth stop valve 14 and the condenser 22. The third branch 11 is provided with a third stop valve 13. The first end of the fourth branch 12 is connected to the first branch 5, and the first end of the fourth branch 12 is located between the first evaporator 1 and the first stop valve 9. The second end of the fourth branch 12 is connected to the main flow path 7, and the second end of the fourth branch 12 is located between the throttling element 8 and the fourth stop valve 14. By connecting each branch to the main flow path through a pipeline switching component 18, the evaporator groups can be switched between parallel and series connection under the switching action of the pipeline switching component 18.

[0042] See also Figure 1 、 Figure 2 and Figure 11As shown, the pipeline switching component 18 is a four-way valve having a first state. When the four-way valve is in the first state, the first port 181, the second port 182, and the fourth port 184 are interconnected within the four-way valve. The four-way valve has a valve core that controls the connectivity of each port. When the pipeline switching component 18 is a four-way valve, the piping layout of the entire air conditioning system can be simplified. When the four-way valve is in the first state, the evaporator groups are controlled to be in parallel, and the air conditioning system can initiate self-cleaning under cooling conditions. The damper 4 is controlled to be in the first position or the second position, and the second evaporator 2 or the second evaporator 2 enters a frosted state. At this time, the states of the stop valves are: the first stop valve 9 and the fourth stop valve 14 are open, and the third stop valve 13 is closed. The gas refrigerant compressed by the compressor 20 is condensed into liquid through the condenser 22. Because the first one-way valve 15 is provided on the fourth branch 12 and the second one-way valve 17 is provided on the fifth branch 16, the liquid refrigerant only flows through the throttling element 8. After throttling and reducing the pressure by the throttling element 8, it is evenly distributed to the first evaporator 1 and the second evaporator 2 for evaporation. The cold energy is blown toward the cab through the evaporating fan 3. The evaporated refrigerant is collected in the pipeline switching component 18, flows back to the main flow 7 through the fourth port 184 of the pipeline switching component 18, and finally returns to the compressor 20. In this process, one of the first evaporator 1 or the second evaporator 2 participates in the normal cooling of the system, and the other evaporator is frosted under the cover of the damper 4. At the same time, when the four-way valve is in the first state, the air-conditioning system can also operate in a high-efficiency cooling mode with both evaporators participating instead of self-cleaning. Furthermore, a third one-way valve 19 is provided on the third branch 11. The third one-way valve 19 is located between the third stop valve 13 and the third port 183 of the four-way valve, and is close to the third port 183. When the four-way valve is in the first state, the third one-way valve 19 can prevent the refrigerant entering the four-way valve from the first branch 5 and the second branch 6 from flowing into the third branch 11 through the third port 183.

[0043] See also Figure 3 and Figure 9As shown, the four-way valve also has a second state. When the four-way valve is in the second state, the first port 181 and the third port 183 are connected within the four-way valve, and the second port 182 and the fourth port 184 are connected within the four-way valve. When the four-way valve is in the second state, the evaporator groups switch from a parallel state to a series state, and the air conditioning system performs a self-cleaning defrost and washing operation on the first evaporator 1 under cooling conditions. When the first evaporator 1 is defrosted, the first stop valve 9 and the fourth stop valve 14 are controlled to close, and the third stop valve 13 is controlled to open. The main channel 7, the third branch 11, the first branch 5, the fourth branch 12, the main channel 7, the second branch 6, and then the main channel 7 are then connected in sequence. In this case, the speed of the condensing fan 23 can be appropriately reduced to reduce the condensing capacity of the condenser 22, so that the refrigerant that has not been fully heat exchanged flows from the main flow path 7 through the third branch 11 into the pipeline switching component 18, and then flows into the first evaporator 1 through the pipeline switching component 18. After the liquid refrigerant exchanges heat with the frost layer on the surface of the first evaporator 1, the frost layer melts into water, which has a cleaning effect. The excess heat continues to heat the first evaporator 1, causing the water hanging on the surface of the first evaporator 1 to heat up and accelerate evaporation. The refrigerant is then further condensed in the first evaporator 1, enters the main flow path 7 through the fourth branch 12, and then flows from the main flow path 7 into the throttling element 8 for throttling and pressure reduction. Finally, it flows into the second evaporator 2 to evaporate, absorb heat, and generate cooling energy. The cooling energy is blown toward the cab via the evaporating fan 3. The evaporated refrigerant then flows back to the compressor 20 through the pipeline switching component 18 to form a cycle.

[0044] Specifically, a first one-way valve 15 is provided on the fourth branch 12. When the first evaporator 1 participates in the normal refrigeration of the system or is controlled to be in a frosting state, the first stop valve 9 is opened, and a portion of the refrigerant throttled by the throttling element 8 flows into the first evaporator 1 from the first branch 5. When the first one-way valve 15 is provided on the fourth branch 12, it can prevent the refrigerant entering the first branch 5 from flowing back into the main flow path 7 through the fourth branch 12. The one-way flow principle of the one-way valve is as follows: during the flow of the refrigerant, the inlet of the first one-way valve 15 is the throttled low-pressure refrigerant, and the outlet is the undisturbed high-pressure refrigerant. Relying on the one-way flow of the one-way valve and the high-low pressure difference, it is ensured that the refrigerant can only flow into the evaporator after passing through the throttling element 8.

[0045] As a specific embodiment, a second stop valve 10 is also provided on the second branch 6, and the second stop valve 10 is located between the second end of the second branch 6 and the second evaporator 2. It also includes a fifth branch 16, and the first end of the fifth branch 16 is connected to the second branch 6, and the first end of the fifth branch 16 is located between the second evaporator 2 and the second stop valve 10, the second end of the fifth branch 16 is connected to the main flow 7, and the second end of the fifth branch 16 is located between the throttling element 8 and the fourth stop valve 14.

[0046] In this embodiment, after the first evaporator 1 has completed self-cleaning, the second evaporator 2 must also be self-cleaned. When the second evaporator 2 is self-cleaning, it is still necessary to control the evaporator group to switch between parallel and series states. When the first evaporator 1 is in the self-cleaning defrosting stage, the series order of the evaporator group is: first evaporator 1-throttling element 8-second evaporator 2; and when the second evaporator 2 is in the self-cleaning defrosting stage, the series order of the evaporator group is required to be: second evaporator 2-throttling element 8-first evaporator 1. A second stop valve 10 is added to the second branch 6, a fifth branch 16 is added to the system, and the switching function of the pipeline switching component 18 is added. It can be achieved that when the second evaporator 2 needs to be defrosted, the series order of the evaporator group is: second evaporator 2-throttling element 8-first evaporator 1.

[0047] See also Figure 4 As shown, the four-way valve also has a third state. In this state, the second port 182 and the third port 183 are connected within the valve, and the first port 181 and the fourth port 184 are connected within the valve. When the outer surface of the second evaporator 2 is sufficiently frosted and defrosting is required, the four-way valve is controlled to the third state, closing the second stop valve 10 and the fourth stop valve 14, and opening the first stop valve 9 and the third stop valve 13. This allows the main channel 7, the third branch channel 11, the second branch channel 6, the fifth branch channel 16, the main channel 7, the first branch channel 5, and finally the main channel 7 to connect in sequence. In this case, the speed of the condensing fan 23 can be appropriately reduced to reduce the condensing capacity of the condenser 22, so that the refrigerant that has not been fully heat-exchanged flows from the main flow path 7 through the third branch 11 into the four-way valve, and then flows into the second evaporator 2 through the four-way valve. After the liquid refrigerant exchanges heat with the frost layer on the surface of the second evaporator 2, the frost layer melts into water, which has a cleaning effect. The excess heat continues to heat the second evaporator 2, causing the water hanging on the surface of the second evaporator 2 to heat up and accelerate evaporation. The refrigerant is then further condensed by the second evaporator 2, enters the main flow path 7 through the fifth branch 16, and then flows from the main flow path 7 into the throttling element 8 for throttling and pressure reduction. Finally, it flows into the first evaporator 1 to evaporate, absorb heat, and generate cold energy. The cold energy is blown toward the cab via the evaporating fan 3. The evaporated refrigerant then flows back to the compressor 20 through the pipeline switching component 18 to form a cycle.

[0048] Specifically, a second one-way valve 17 is provided on the fifth branch 16. When the second evaporator 2 participates in the normal refrigeration of the system or is controlled to be in a frosting state, it is necessary to control the second stop valve 10 to open, and part of the refrigerant after throttling by the throttling element 8 flows into the second evaporator 2 from the second branch 6. When the second one-way valve 17 is provided on the fifth branch 16, it can prevent the refrigerant entering the second branch 6 from flowing back into the main flow path 7 through the fifth branch 16. The one-way circulation principle of the one-way valve is: during the movement of the refrigerant, the inlet of the second one-way valve 17 is the low-pressure refrigerant after throttling, and the outlet is the high-pressure refrigerant without throttling. Relying on the one-way circulation and high-low pressure difference of the one-way valve, it is ensured that the refrigerant can only flow into the evaporator after passing through the throttling element 8.

[0049] The present invention also provides a car comprising the above-mentioned air-conditioning system.

[0050] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An air conditioning system, characterized in that: The invention comprises an evaporator group and a condenser (22), wherein the evaporator group comprises a first evaporator (1), a second evaporator (2) and a throttling element (8). The evaporator group has a parallel state and a series state. In the parallel state, the refrigerant flowing out of the condenser (22) is throttled by the throttling element (8) and then flows into the first evaporator (1) and the second evaporator (2) in parallel. In the series state, the refrigerant flowing out of the condenser (22) flows into one of the first evaporator (1) and the second evaporator (2) and then flows into the other of the first evaporator (1) and the second evaporator (2) after being throttled by the throttling element (8). When the air-conditioning system operates in a cooling mode and the evaporator group needs to be self-cleaned, in the parallel state, the first evaporator (1) is controlled to frost, and after the first evaporator (1) is frosted, the evaporator group is controlled to switch from the parallel state to the series state so that the refrigerant flowing out of the condenser (22) flows into the first evaporator (1) to achieve defrosting of the first evaporator (1).

2. The air conditioning system according to claim 1, characterized in that After the first evaporator (1) is defrosted, the evaporator group is controlled to switch from the series state to the parallel state, and in the parallel state, the second evaporator (2) is controlled to frost. After the second evaporator (2) is frosted, the evaporator group is controlled to switch from the parallel state to the series state, so that the refrigerant flowing out of the condenser (22) flows into the second evaporator (2) to achieve defrosting of the second evaporator (2).

3. The air conditioning system according to claim 2, characterized in that After the second evaporator (2) has finished defrosting, the evaporator group is controlled to switch from the series state to the parallel state.

4. The air conditioning system according to claim 1, characterized in that The invention also includes a damper (4) and an evaporation fan (3), wherein the damper (4) has a first position, a second position, and a third position. When the damper (4) is in the first position, the damper (4) can block the first evaporator (1) so that the airflow generated when the evaporation fan (3) is in operation only passes through the second evaporator (2); when the damper (4) is in the second position, the damper (4) can block the second evaporator (2) so that the airflow generated when the evaporation fan (3) is in operation only passes through the first evaporator (1); when the damper (4) is in the third position, the airflow generated when the evaporation fan (3) is in operation flows through both the first evaporator (1) and the second evaporator (2).

5. The air conditioning system according to claim 4, characterized in that The damper (4) is located in the area between the first evaporator (1) and the second evaporator (2), and the damper (4) can be controlled to rotate with the first end of the damper (4) as an axis. The rotation of the damper (4) enables the damper (4) to switch between the first position, the second position, and the third position.

6. The air conditioning system according to claim 5, characterized in that The first evaporator (1) and the second evaporator (2) are arranged in a V shape, and the first end of the damper (4) is located at the junction of the first evaporator (1) and the second evaporator (2). When the damper (4) rotates to a limit position at the first evaporator (1), it is in the first position, and when the damper (4) rotates to a limit position at the second evaporator (2), it is in the second position.

7. The air conditioning system according to claim 1, characterized in that It also includes a first evaporation fan and a second evaporation fan, wherein the first evaporation fan is used to independently drive the air flow of the first evaporator (1), and the second evaporation fan is used to independently drive the air flow of the second evaporator (2).

8. The air conditioning system according to any one of claims 1 to 7, characterized in that: The invention also includes a first branch (5), a second branch (6), a third branch (11), a fourth branch (12), a main flow path (7), and a pipeline switching component (18). The pipeline switching component (18) has a first port (181), a second port (182), a third port (183), and a fourth port (184). The first end of the first branch (5) is connected to the first port (181), the first end of the second branch (6) is connected to the second port (182), and the first end of the third branch (11) is connected to the third port (183). The first end of the main flow path (7) is in communication with the fourth port (184), the second ends of the first branch path (5) and the second branch path (6) are both in communication with the second end of the main flow path (7), the condenser (22) and the throttling element (8) are both arranged on the main flow path (7), and the throttling element (8) is located between the condenser (22) and the second end of the main flow path (7), and a compressor (20) is further provided on the main flow path (7), and the compressor (20) is located between the condenser (22) and the first end of the main flow path (7), and the first branch path (5) and the second branch path (6) are both in communication with the second end of the main flow path (7). The evaporator (1) is arranged on the first branch (5), and the first branch (5) is further provided with a first stop valve (9), and the first stop valve (9) is located between the second end of the first branch (5) and the first evaporator (1). The second evaporator (2) is arranged on the second branch (6). The main flow path (7) is further provided with a fourth stop valve (14), and the fourth stop valve (14) is located between the throttling element (8) and the condenser (22). The second end of the third branch (11) is communicated with the main flow path (7), and the The second end of the third branch (11) is located between the fourth stop valve (14) and the condenser (22), and the third stop valve (13) is provided on the third branch (11). The first end of the fourth branch (12) is connected to the first branch (5), and the first end of the fourth branch (12) is located between the first evaporator (1) and the first stop valve (9). The second end of the fourth branch (12) is connected to the main flow path (7), and the second end of the fourth branch (12) is located between the throttling element (8) and the fourth stop valve (14).

9. The air conditioning system according to claim 8, characterized in that The pipeline switching component (18) is a four-way valve, and the four-way valve has a first state. When the four-way valve is in the first state, the first port (181), the second port (182), and the fourth port (184) are interconnected in the four-way valve.

10. The air conditioning system according to claim 9, characterized in that The four-way valve also has a second state. When the four-way valve is in the second state, the first port (181) and the third port (183) are communicated in the four-way valve, and the second port (182) and the fourth port (184) are communicated in the four-way valve.

11. The air conditioning system according to claim 9, characterized in that A first one-way valve (15) is provided on the fourth branch (12).

12. The air conditioning system according to claim 11, characterized in that The second branch (6) is further provided with a second stop valve (10), which is located between the second end of the second branch (6) and the second evaporator (2). The second branch (6) also includes a fifth branch (16), a first end of the fifth branch (16) being in communication with the second branch (6), and a first end of the fifth branch (16) being located between the second evaporator (2) and the second stop valve (10), a second end of the fifth branch (16) being in communication with the main flow (7), and a second end of the fifth branch (16) being located between the throttling element (8) and the fourth stop valve (14).

13. The air conditioning system according to claim 12, characterized in that The four-way valve also has a third state. When the four-way valve is in the third state, the second port (182) and the third port (183) are communicated in the four-way valve, and the first port (181) and the fourth port (184) are communicated in the four-way valve.

14. The air conditioning system according to claim 12, wherein: A second one-way valve (17) is provided on the fifth branch (16).

15. An automobile, characterized in that: An air conditioning system comprising any one of claims 1-14.

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