Indoor unit of vehicle air conditioning system and vehicle

Abstract

The invention provides an indoor unit of a vehicle air conditioning system and a vehicle, and belongs to the technical field of air conditioners. The indoor unit comprises a shell provided with a fresh air opening, an air outlet and an air return opening; the drying filter is embedded in the fresh air opening; the evaporator is located in the shell and divides the shell into an air inlet cavity and an air outlet cavity, the air inlet cavity communicates with the fresh air opening and the air return opening, and the air outlet cavity communicates with the air outlet; the heater is located in the air outlet cavity; the fresh air door is located at the fresh air opening and movably connected with the shell; the air distribution door is positioned at the air outlet and is movably connected with the shell; the bypass assembly is connected with the shell, and a bypass channel is formed in the bypass assembly. The dehumidification effect of the vehicle air conditioning system can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of air conditioners, and particularly relates to an indoor unit of a vehicle air conditioning system and a vehicle. BACKGROUND

[0002] Vehicle air conditioning systems (such as air conditioning systems equipped in engineering vehicles and commercial vehicles) mostly take temperature control as the core function, aiming to provide a suitable driving environment for the driver. Such systems mainly focus on refrigeration and heating performance in design to meet the basic comfort needs in different seasons.

[0003] In the related art, a vehicle air conditioning system includes an indoor unit and an outdoor unit. The outdoor unit is usually installed outside the vehicle and is responsible for heat exchange with the external environment and provides power for the system. The indoor unit is installed inside the cab and is responsible for air processing and sending into the vehicle cabin. The indoor unit includes a housing, an evaporator, a distribution air door, and a fresh air door. The housing is spaced apart from a fresh air inlet, a return air inlet, and an air outlet. The fresh air inlet is used to introduce fresh outdoor air into the housing. The return air inlet is used to introduce return air in the cab into the housing. The air outlet is used to output air processed by the evaporator into the cab. The evaporator is located in the housing and defines an air inlet duct with the housing. One end of the air inlet duct is in communication with the fresh air inlet and the return air inlet, and the other end of the air inlet duct faces the evaporator. The distribution air door is located at the air outlet and is movably connected with the housing to adjust the air outlet direction and open and close the air outlet. The fresh air door is located at the fresh air inlet and is movably connected with the housing to control the opening and closing of the fresh air inlet.

[0004] However, the above vehicle air conditioning system has obvious shortcomings in dealing with high humidity conditions, especially when running in a humid environment. A large amount of high humidity fresh air entering the cab can cause a sharp rise in humidity, which not only seriously affects comfort, but also easily causes the front windshield and side window glass to quickly fog, threatening driving safety. If dehumidification of indoor air is needed in winter, the refrigeration function must be started. However, this will significantly reduce the temperature in the cab, reduce comfort, and the overall dehumidification efficiency is low. SUMMARY

[0005] The present disclosure provides an indoor unit of a vehicle air conditioning system and a vehicle, which can improve the dehumidification effect of the vehicle air conditioning system. The technical solution is as follows:

[0006] The indoor unit of the vehicle air conditioning system provided by the embodiments of the present disclosure comprises a shell, a dry filter, an evaporator, a heater, a fresh air damper, a distribution damper, a bypass assembly, and a humidity sensor.

[0007] In another implementation manner of the present disclosure, the outlet cavity is divided into a first sub-cavity and a second sub-cavity by the heater, and the first sub-cavity is arranged adjacent to the evaporator; the bypass assembly comprises a bypass shell and a bypass damper, the bypass shell is located on one side of the shell, the bypass damper is located at the connection between the second sub-cavity and the bypass channel, and is movably connected with the shell to control the on-off of the bypass channel and the second sub-cavity and the on-off of the second sub-cavity and the outlet.

[0008] In another implementation manner of the present disclosure, the bypass shell is a long strip-shaped hollow plate structure, and the cavity in the bypass shell defines the bypass channel.

[0009] In another implementation manner of the present disclosure, the vehicle air conditioning system further comprises a cold-hot air damper, the cold-hot air damper is located in the first sub-cavity, and the cold-hot air damper is movably connected with the shell to control the on-off of the first sub-cavity and the outlet.

[0010] In another implementation manner of the present disclosure, the vehicle air conditioning system further comprises a humidity sensor, and a detection part of the humidity sensor is connected with the filter element.

[0011] In another implementation manner of the present disclosure, the vehicle air conditioning system further comprises a controller, and the controller is electrically connected with the humidity sensor and the bypass damper, the fresh air damper, the distribution damper, and the cold-hot air damper.

[0012] In another implementation manner of the present disclosure, the vehicle air conditioning system further comprises a fan, and the fan is connected with the shell, and a suction port of the fan is located in the inlet cavity.

[0013] In yet another implementation form of the disclosure, the air suction port of the fan is opposite to the return air port.

[0014] In yet another implementation form of the disclosure, the shell comprises an upper half shell and a lower half shell, the upper half shell and the lower half shell are buckled together, one end of the upper half shell and one end of the lower half shell define the fresh air port, the other end of the upper half shell and the other end of the lower half shell define the air outlet, and the return air port is located between the upper half shell and the lower half shell and close to the area of the fresh air port.

[0015] In another aspect, the disclosure also provides a vehicle comprising the vehicle air conditioning system described above.

[0016] The technical scheme provided by the embodiments of the disclosure has the following beneficial effects:

[0017] Since the indoor unit comprises the drying filter, and the drying filter is embedded at the fresh air port and is in contact with the shell, the fresh air entering the shell from the fresh air port is dried and filtered by the drying filter to remove moisture, so that the humid air is filtered and dried into dry air. After the filtered and dried air is mixed with the air from the return air port, i.e. the circulating air in the cab, in the air inlet cavity, and then passes through the evaporator for refrigeration or the heater for heating, the dry cold air or hot air required by the user is delivered to the cab, which not only ensures the air quality in the cab, but also does not increase the humidity of the cab, thereby improving the comfort.

[0018] Moreover, since the indoor unit further comprises the bypass assembly, and the bypass assembly has a bypass channel for connecting the fresh air port and the air outlet cavity when the humidity of the filter core is higher than the threshold, when the humidity of the drying filter is higher than the threshold, the fresh air damper cuts off the path between the fresh air port and the air inlet cavity, the air distribution damper closes the air outlet, the bypass assembly connects the fresh air port and the air outlet cavity, and the heater starts to work. After the circulating air in the cab is heated by the heater, it is delivered to the drying filter through the bypass channel, the drying filter is heated and dried after absorbing water, and the hot air is finally discharged to the outside of the cab through the fresh air port in reverse, and at the same time, the dust adsorbed on the outer surface of the drying filter can also be blown off, achieving the effect of avoiding maintenance of the drying filter. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the disclosure, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structural schematic diagram of an indoor unit of a vehicle air conditioning system provided by an embodiment of the present disclosure;

[0021] Figure 2 is Figure 1 a schematic diagram of normal refrigeration of the indoor unit in

[0022] Figure 3 is Figure 1 a schematic diagram of normal heating of the indoor unit in

[0023] Figure 4 is Figure 1 a schematic diagram of the indoor unit heating and drying the drying filter in

[0024] The meanings of the symbols in the drawings are as follows:

[0025] 1, housing; 101, fresh air inlet; 102, air outlet; 103, return air inlet; 104, fresh air cavity; 105, air outlet cavity; 1051, first sub-cavity; 1052, second sub-cavity; 11, upper half housing; 111, top cover; 112, first air guide piece; 113, second air guide piece; 12, lower half housing; 121, bottom plate; 122, third air guide piece; 123, fourth air guide piece; 124, fifth air guide piece; 106, first flow passage; 107, second flow passage; 108, third flow passage;

[0026] 2, drying filter; 21, filter element;

[0027] 3, evaporator; 4, heater; 5, fresh air damper; 6, air distribution damper;

[0028] 7, bypass assembly; 701, bypass passage; 71, bypass housing; 72, bypass damper;

[0029] 8, cold and hot air damper; 9, humidity sensor; 10, fan. DETAILED DESCRIPTION

[0030] To make the purposes, technical solutions, and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in further detail below with reference to the drawings.

[0031] To clearly illustrate the working process of the vehicle air conditioning system provided by the embodiments of the present disclosure, here, the main structure and functions of the vehicle air conditioning system will be briefly introduced.

[0032] The vehicle air conditioning system includes an outdoor unit and an indoor unit. The outdoor unit is usually installed outside the cab and is responsible for heat exchange with the outside environment and provides power for the system. The outdoor unit includes a compressor, a condenser, a condenser fan, a liquid storage drying bottle, etc. Among them, the compressor is the "heart" of the entire air conditioning system, driven by the engine through the belt, belonging to the power structure of the outdoor unit. The condenser is used to dissipate heat and condense the high-temperature and high-pressure refrigerant gas from the compressor into a liquid. The condenser fan is used to help the condenser dissipate heat forcibly, which is particularly important when the vehicle is at low speed or idling. The liquid storage drying bottle is installed near the condenser outlet and is used to store, dry and filter the refrigerant. The main function of the outdoor unit is to complete the compression, condensation and liquefaction process of the refrigerant, and discharge heat to the outside environment. The indoor unit is installed inside the cab and is responsible for the final processing of air and sending it into the vehicle cabin. The indoor unit includes a shell, an evaporator, a heater, and a damper, etc. The shell is the "body" of the indoor unit, which wraps the evaporator, various dampers, etc. to provide a mounting base for them. The evaporator is the "cold source" of the air conditioning system, equivalent to the refrigeration fins of the indoor unit. The low-temperature refrigerant evaporates here, absorbing heat from the air flowing over its surface, achieving cooling and dehumidification. The damper is a flap controlled by the corresponding actuator, used to control the internal and external circulation, the blowing mode (blowing face, blowing foot, defrosting), and the mixing ratio of cold and hot air, which is the key to accurately control the air supply. The air conditioning system can be summarized as four key steps when refrigerating. The compressor compresses the low-temperature and low-pressure gaseous refrigerant medium into a high-temperature and high-pressure gaseous state. The high-temperature and high-pressure gaseous refrigerant changes into a low-temperature and high-pressure liquid refrigerant after being condensed by the condenser. The low-temperature and high-pressure liquid refrigerant is throttled and decompressed by the expansion valve to become a low-temperature and low-pressure mist mixture. The low-temperature and low-pressure mist mixture evaporates into a low-temperature and low-pressure gaseous refrigerant after passing through the evaporator. This process absorbs a large amount of heat from the air flowing through the evaporator, and the cooled air is sent into the cab to achieve refrigeration. The refrigerant (low-temperature and low-pressure gaseous refrigerant) that has absorbed heat is drawn back by the compressor, ready to start the next cycle.

[0033] When heating is required, cool air enters the indoor unit, and the cool air is first cooled (lower temperature) by the evaporator, causing the water vapor in it to condense into water and be discharged. The cool air that has passed through (or bypassed) the evaporator then flows through the heater to be heated, causing the cool air to become warm air and be delivered to the cab through the control of the damper.

[0034] The present disclosure provides an indoor unit of a vehicle air conditioning system, as shown in Figure 1 The indoor unit includes a shell 1, a drying filter 2, an evaporator 3, a heater 4, a fresh air damper 5, an air distribution damper 6, and a bypass assembly. Among them, the shell 1 has a fresh air inlet 101, an air outlet 102, and an air return inlet 103 distributed at intervals.

[0035] The drying filter 2 is embedded in the fresh air inlet 101. The evaporator 3 is located in the shell 1, and divides the shell 1 into an air inlet cavity 104 and an air outlet cavity 105. The air inlet cavity 104 is connected to the fresh air inlet 101 and the return air inlet 103 respectively. The air outlet cavity 105 is connected to the air outlet 102.

[0036] The heater 4 is located in the air outlet cavity 105. The heater 4 is used when the humidity of the filter core 21 in the drying filter 2 is higher than a threshold value. The fresh air damper 5 is located at the fresh air inlet 101 and movably connected to the shell 1. The fresh air damper 5 is used to cut off the passage between the fresh air inlet 101 and the air inlet cavity 104 when the humidity of the filter core 21 is higher than the threshold value.

[0037] The air distribution damper 6 is located at the air outlet 102 and movably connected to the shell 1. The air distribution damper 6 is used to close the air outlet 102 when the humidity of the filter core 21 is higher than the threshold value.

[0038] The bypass assembly 7 is connected to the shell 1 and has a bypass passage 701 inside. The bypass passage 701 is used to connect the fresh air inlet 101 and the air outlet cavity 105 when the humidity of the filter core 21 is higher than the threshold value.

[0039] When the indoor unit provided by the embodiment of the present disclosure is used in a vehicle air conditioning system of a vehicle, since the indoor unit includes the shell 1, the shell 1 can provide a mounting basis for other components or parts. At the same time, since the indoor unit includes the drying filter 2, and the drying filter 2 is embedded at the fresh air inlet 101 and connected to the shell 1, the fresh air entering the shell 1 from the fresh air inlet 101 can be dried and filtered by the drying filter 2 to remove moisture, so that the humid air is filtered and dried into dry air. The filtered and dried air is mixed with the air flowing out of the return air inlet 103 in the air inlet cavity 104, and then cooled by the evaporator 3 or heated by the heater 4, and then the dry cold air or dry hot air required by the user is delivered to the cab. The dry fresh air not only ensures the air quality in the cab, but also does not increase the humidity in the cab, thereby improving the comfort.

[0040] Furthermore, since the indoor unit also includes a bypass component 7, and the bypass component 7 has a bypass channel 701 inside, the bypass channel 701 is used to connect the fresh air inlet 101 with the air outlet 105 when the humidity of the filter element 21 is higher than the threshold. Therefore, when the humidity of the dryer filter 2 is higher than the threshold, the fresh air damper 5 cuts off the passage between the fresh air inlet 101 and the air inlet 104, and at the same time the air distribution damper 6 closes the air outlet 102. The bypass component 7 connects the fresh air inlet 101 with the air outlet 105, and the heater 4 starts to work. The heater 4 heats the circulating air discharged from the driver's cab and then delivers it to the dryer filter 2 through the bypass channel 701 to heat and dry the dryer filter 2 after it has absorbed water. The hot air is finally discharged to the outside of the driver's cab through the fresh air inlet 101 in the opposite direction. At the same time, it can also blow away the dust adsorbed on the outer surface of the dryer filter 2, so as to achieve the effect of avoiding maintenance of the dryer filter 2.

[0041] Figure 2 yes Figure 1 A diagram illustrating the normal cooling operation of the indoor unit, combined with... Figure 2 When the temperature inside the cab is high and cooling is required (e.g., the temperature inside the cab exceeds 30°C), the air conditioning system is in cooling mode. The fresh air damper 5 is partially or fully open. Air with a certain humidity from outside is dried and filtered by the dryer filter 2. This dried air mixes with the return air from the cab in the air inlet cavity 104, and is then cooled by the evaporator 3 to form cold air. The cold air enters the air outlet cavity 105. According to the user's required air delivery method, the air distribution damper 6 controls the air delivery direction, delivering the cold air to different parts of the cab (including the driver's face, feet, and the windshield, or any combination thereof). After cooling for a period of time, when the humidity of the filter element 21 of the dryer filter 2 exceeds the threshold, the air conditioning system enters automatic dehumidification mode (that is, automatically drying the filter element 21 of the dryer filter 2). The fresh air damper 5 and the air distribution damper 6 activate to cut off the passage between the fresh air inlet 101 and the air inlet cavity 104, and to close the air outlet 102, respectively. The return air from the driver's cab enters the air intake chamber 104 through the return air inlet 103. After being cooled by the evaporator 3, it is heated by the heater 4 to become dry return air. This dry return air is blown towards the dryer filter 2 via the bypass channel 701, heating and drying the dryer filter 2. After passing through the dryer filter 2, the hot air is blown out of the driver's cab through the fresh air inlet 101. When the humidity of the filter element 21 of the dryer filter 2 is lower than the set value, the air conditioning system is restored to the cooling mode before the dehumidification mode.

[0042] Figure 3 yes Figure 1 A diagram illustrating normal heating operation of the indoor unit, combined with... Figure 3When the temperature in the cab is low and heating is required (for example, the temperature in the cab is lower than 15°), the air conditioning system is in heating mode, the fresh air door 5 is partially or fully opened, the cold air with certain humidity from the outside is filtered into dry air through the drying filter 2, mixed with the return air in the cab in the air inlet cavity 104, and then enters the air outlet 102 after being heated by the evaporator 3 and the heater 4. According to the user's requirement for the air supply mode, the air supply direction is controlled by adjusting the air distribution damper 6, and the hot air is delivered to one or any combination of the user's face, feet, and front windshield in the cab.

[0043] Figure 4 is Figure 1 a schematic diagram of the indoor unit heating and drying filter, in combination with Figure 4 When the air conditioner is used for a period of time, the humidity of the drying filter 2 is greater than the set value, and the air conditioning system is in automatic dehumidification mode (that is, the filter element 21 of the drying filter 2 is automatically heated and dried), the fresh air door 5 and the air distribution damper 6 are actuated to respectively cut off the path between the fresh air outlet 101 and the air inlet cavity 104 and control the air outlet 102 to be closed. The return air in the cab enters the air inlet cavity 104 through the return air outlet 103, first passes through the evaporator 3, and then is heated by the heater 4 to become dry return air. The dry indoor return air is blown to the drying filter 2 through the bypass passage 701 to heat and dry the drying filter 2. The return air after passing through the drying filter 2 is blown to the outside of the cab from the fresh air outlet 101 in reverse. When the humidity of the filter element 21 of the drying filter 2 is lower than the set value, the air conditioning system returns to the previous heating mode.

[0044] in combination with Figure 1 Optionally, the air outlet cavity 105 is divided into a first sub-cavity 1051 and a second sub-cavity 1052 by the heater 4, and the first sub-cavity 1051 is arranged adjacent to the evaporator 3.

[0045] The bypass assembly 7 includes a bypass housing 71 and a bypass damper 72. The bypass housing 71 is located on one side of the shell 1, and the bypass damper 72 is located at the connection between the second sub-cavity 1052 and the bypass passage 701 and is movably connected with the shell 1 to control the opening and closing of the bypass passage 701 and the second sub-cavity 1052 and control the opening and closing of the second sub-cavity 1052 and the air outlet 102.

[0046] In the above implementation manner, the bypass housing 71 is used to connect with the shell 1 and provide a setting place for the bypass passage 701. The opening and closing of the bypass damper 72 is used to control the opening and closing of the bypass passage 701 and the air outlet cavity 105 or the opening and closing of the second sub-cavity 1052 and the air outlet 102. The arrangement of the first sub-cavity 1051 and the second sub-cavity 1052 can make the air flowing out of the air outlet cavity 105 whether be heated by the heater 4.

[0047] Optionally, the bypass shell 71 is a long strip-shaped hollow plate structure, and the cavity inside the bypass shell 71 defines the bypass passage 701.

[0048] The long strip-shaped hollow plate structure refers to an elongated profiled plate structure, and the inside is hollow rather than solid.

[0049] In the above implementation, the bypass shell 71 is a long strip-shaped hollow plate structure, which not only naturally defines the bypass passage 701 through the hollow inside the plate structure, but also facilitates connection with the bottom of the shell 1, further serving as a part of the structure to support or strengthen the shell 1, thereby improving the structural integrity and reliability of the entire product. It does not need additional brackets or protective sleeves to fix the passage, simplifying the overall design.

[0050] Optionally, the vehicle air conditioning system further comprises a cold-hot air door 8, which is located in the first sub-cavity 1051, and the cold-hot air door 8 is movably connected with the shell 1 to control the on-off between the first sub-cavity 1051 and the air outlet 102.

[0051] In the above implementation, the arrangement of the cold-hot air door 8 can control the mixing ratio of cold and hot air, thereby accurately controlling the outlet air temperature. The air cooled by the evaporator is "cold air". The air heated by the heater is "hot air". By changing the opening angle of the cold-hot air door 8, the mixing ratio of cold and hot air can be controlled, thereby controlling the outlet air temperature. For example, the cold-hot air door 8 is rotated to completely block the air duct leading to the heater 4. All cold air from the evaporator is blocked by the cold-hot air door 8 and cannot enter the heater 4, but can only directly pass to the air outlet 102. At this time, the coldest air is blown out, which is used for rapid cooling in summer. When the cold-hot air door 8 is rotated to completely block the cold air duct bypassing the heater 4. All cold air from the evaporator is forced to pass through the heater 4 and is fully heated. At this time, the hottest warm air is blown out, which is used for heating in winter. When the cold-hot air door 8 is at an intermediate angle, the cold air flow from the evaporator is divided into two streams. One stream passes through the gap between the cold-hot air door 8 and the shell 1 and directly blows to the air outlet 102 to maintain the "cold air" state. The other stream is guided by the cold-hot air door 8 to pass through the heater 4 to become "hot air", and then the hot air blows to the air outlet 102. The two streams of air with different temperatures mix in the air outlet 102, and finally produce a mixed air between the coldest and the hottest.

[0052] Optionally, the filter element 21 comprises a base layer, a water absorption layer, and a filter layer.

[0053] In the above implementation, the drying filter 2 is designed in such a way that the high-humidity fresh air is preliminarily dried by the water absorption layer of the filter element 21 before entering the air conditioning system, thereby reducing the absolute humidity of the air and reducing the main dehumidification load of the evaporator from the source. At the same time, the filter layer can also be used to preliminarily filter the fresh air to prevent foreign matter from entering the shell 1.

[0054] Exemplarily, the substrate is generally composed of a high-porosity fibrous material, such as glass fiber, synthetic polymer fiber or non-woven fabric. The main function of the substrate is to provide structural support for other layers and form a large and stable surface area for subsequent coating or compounding of the water absorption layer. The water absorption layer is composed of a high-hygroscopic (hydrophilic) material (such as silica gel, molecular sieve or activated alumina), which is usually in the form of a coating or nanocomposite fiber on the substrate. The filter layer has both filtering functions and is generally a high-efficiency particulate air filter. In this way, a multifunctional integrated filter with "dehumidification + dust removal + odor removal" can be formed.

[0055] Optionally, the vehicle air conditioning system further comprises a humidity sensor 9, and the detection part of the humidity sensor 9 is connected to the filter element 21.

[0056] In the above implementation, the humidity sensor 9 is used to monitor the humidity state of the filter element 21 in real time, to provide key data for the decision-making of the controller in the vehicle air conditioning system, thereby achieving efficient dehumidification of the filter element 21. The specific working process is as follows: the humidity sensor 9 continuously monitors the humidity of the filter element 21. When the humidity value exceeds the preset threshold value, a signal of "the filter element 21 is saturated and needs to be regenerated" is sent to the controller. After receiving the signal, the controller automatically controls the fresh air door 5 to close the path between the fresh air outlet 101 and the air inlet cavity 104, cutting off the source of humid air, and controls the air outlet 102 to be closed. Then the bypass air door 72 is controlled to make the bypass passage 701 communicate with the air outlet cavity 105, and the return air from the return air outlet 103 is heated by the heater 4 and then blown through the saturated filter element 21. The hot air evaporates and carries away the water absorbed by the filter element 21, and is discharged outside the vehicle. If there is no humidity sensor 9, the filter element 21 can only be used as a common and disposable desiccant, which loses its effectiveness after saturation and cannot realize the real intelligent, efficient and sustainable active dehumidification function.

[0057] In this embodiment, when the drying filter 2 is heated and dried, the humidity sensor 9 detects that the humidity of the filter element 21 is lower than the threshold value, the fan 10 is first adjusted to the maximum air volume, so that the return air can continuously blow to the filter element 21 and maintain for more than 60 seconds, so that the dust on the outer surface of the filter element 21 can be blown away to clean the filter element 21, and then the air conditioning system can be restored to the cooling or heating mode before the dehumidification mode.

[0058] Optionally, the vehicle air conditioning system also includes a controller, which is electrically connected to a humidity sensor 9 and a bypass vent 72, a fresh air vent 5, a distribution air vent 6, and a hot / cold air vent 8.

[0059] In this embodiment, the vehicle air conditioning system has a dedicated actuator for each damper, used to precisely control its opening and closing angle. Specifically, the fresh air damper 5, the distribution air damper 6, the bypass air damper 72, and the hot and cold air damper 8 are driven independently by their respective fresh air damper actuator, distribution air damper actuator, bypass air damper actuator, and hot and cold air damper actuator. (See also: damper and its corresponding actuator). Figures 2-4 The structure where the damper and airlock are connected (as indicated by the arrow, i.e., the block diagram in the figure) is directly connected via a hole-shaft assembly relationship. Each actuator controls the opening and closing of its corresponding damper. All the aforementioned actuators (fresh air damper actuator, distribution air damper actuator, bypass air damper actuator, and hot / cold air damper actuator) are electrically connected to the controller. By receiving control signals from the controller, the fresh air damper actuator, distribution air damper actuator, bypass air damper actuator, and hot / cold air damper actuator can automatically and precisely adjust the opening and closing state of their respective dampers.

[0060] The actuators mentioned above are essentially devices that convert electrical signals into precise mechanical motion. For example, a stepper motor actuator is controlled internally by pulse signals. Each time a pulse is received, the motor shaft rotates by a fixed angle (one step). The controller controls the rotation angle by sending the number of pulses and the rotation speed by sending the pulse frequency.

[0061] Optionally, the vehicle air conditioning system also includes a fan 10, which is connected to the housing 1, and the air intake of the fan 10 is located in the air intake cavity 104.

[0062] In the above implementation, the fan 10 generates suction within the casing 1, drawing in the air mixed with the filtered and dried fresh air and the return air flowing from the return air inlet 103 into the air inlet chamber 104. This mixed air is then forcibly blown towards and through the evaporator 3, then into the air outlet chamber 105, and finally delivered to the driver's cab. In other words, the fan 10 is responsible for making the air circulate. Without the fan 10, air circulation would be impossible.

[0063] Optionally, the air intake and return air inlet of the fan 10 are arranged facing each other. Here, "facing each other" means that the central axis of the air intake and the central axis of the return air inlet 103 are coaxial.

[0064] In the above implementation, the air inlet of the fan 10 is arranged opposite to the air return port 103 to create a straight and smooth air flow channel. The air can be directly and unobstructed sucked into the fan 10 from the air return port 103, avoiding vortex and pressure loss caused by sharp turns and winding paths, thereby reducing the overall energy consumption of the system.

[0065] Continuing to combine Figure 1 Optionally, the shell 1 comprises an upper half shell 11 and a lower half shell 12, the upper half shell 11 and the lower half shell 12 are buckled together, one end of the upper half shell 11 and one end of the lower half shell 12 define the fresh air port 101, the other end of the upper half shell 11 and the other end of the lower half shell 12 define the air outlet 102, and the air return port 103 is located between the upper half shell 11 and the lower half shell 12 and is close to the area of the fresh air port 101.

[0066] In the above implementation, the shell 1 is provided as an upper half shell 11 and a lower half shell 12, which is simpler in shape and easier to manufacture than a monolithic structure, reducing the complexity and cost of the machining process. Moreover, during assembly, all internal core components (such as the evaporator 3, the heater 4, the fan 10, etc.) can be easily placed and fixed in the lower half shell 12 first, and then the upper half shell 11 is covered and sealed, simplifying the assembly process. In addition, this split design can better adapt to the irregular and compact installation space under the automobile instrument panel, and by optimizing the shape of the upper and lower shells, the maximum internal volume and the minimum external occupied space can be achieved.

[0067] Moreover, the fresh air port 101 and the air outlet 102 are respectively arranged at the two ends of the shell 1, which can maximize the air flow in the shell 1, ensuring that the air is fully exchanged with the evaporator 3 and the heater 4, and improving the efficiency. The air return port 103 is located between the upper half shell 11 and the lower half shell 12, and the bypass channel 701 is integrated in the lower half shell 12, making the structure compact and the air flow path short and direct.

[0068] Continuing to refer to Figure 1 Optionally, the upper half shell 11 comprises a top cover 111, a first air guide sheet 112 and a second air guide sheet 113, the first air guide sheet 112 and the second air guide sheet 113 are spaced apart at one end of the top cover 111 away from the fresh air port 101, the second air guide sheet 113 is located between the first air guide sheet 112 and the evaporator 3, and the first air guide sheet 112 and the second air guide sheet 113 are connected to the top cover 111, and the second air guide sheet 113 covers part of the structure of the evaporator 3.

[0069] The lower half shell 12 comprises a bottom plate 121, a third air guide sheet 122 and a fourth air guide sheet 123, which are spaced apart at an end of the bottom plate 121 away from the fresh air port 101, the third air guide sheet 122 is located between the fourth air guide sheet 123 and the heater 4, and the third air guide sheet 122 and the fourth air guide sheet 123 are connected with the bottom plate 121. The first flow passage 106 is formed between the third air guide sheet 122 and the second air guide sheet 113, and connects the communication outlet 102 and the first sub-cavity 1051. The second flow passage 107 is formed between the third air guide sheet 122 and the fourth air guide sheet 123, and connects the communication outlet 102 and the second sub-cavity 1052. The cold and hot air door 8 is located at the first flow passage 106, and is used to control the opening and closing of the first flow passage 106. The above structure facilitates the arrangement and installation of different air doors, thereby controlling the opening and closing of different passages.

[0070] In the embodiment, the lower half shell 12 further comprises a fifth air guide sheet 124, which is located on a side of the fourth air guide sheet 123 away from the third air guide sheet 122. The third flow passage 108 is formed between the fifth air guide sheet 124 and the fourth air guide sheet 123, and the first opening of the communication outlet 102 is formed between the third flow passage 108 and the bottom plate 121. The first opening is in communication with one end of the third flow passage 108. The second opening of the communication outlet 102 is formed between the fifth air guide sheet 124 and the second air guide sheet 113. The second opening is in communication with the other end of the third flow passage 108. The air distribution door 6 is two, and the two air distribution doors 6 are arranged side by side in the second opening, and one of them is arranged in the third flow passage 108.

[0071] The two air distribution doors 6 are linked and controlled by a shared actuator driving mode disc, so as to realize multiple air supply modes such as foot blowing, face blowing and glass blowing.

[0072] In addition, in order to facilitate manufacturing and processing, the bottom plate 121 can be an integral structure with the bypass shell 71.

[0073] On the other hand, the disclosure also provides a vehicle comprising the indoor unit of the vehicle air conditioning system.

[0074] The above vehicle has the same beneficial effects as described above, which will not be repeated here.

[0075] Among them, the above vehicle can be any one of engineering vehicles and commercial vehicles.

[0076] The working process of the vehicle air conditioning system provided by the embodiment of the disclosure will be briefly introduced as follows:

[0077] Combined Figure 2When the air conditioning system needs to cool, the controller controls the cool-hot damper 8 and the bypass damper 72 to be closed, and controls the fresh air damper 5 to be partially opened or fully opened. The air with certain humidity from the outside is dried and filtered by the filter 21 to become dry air, which is mixed with the return air from the cab in the inlet air chamber 104, cooled by the evaporator 3 to form cold air, and then enters the outlet air chamber 105. According to the user's requirement of air supply mode, the cold air is delivered to different parts of the cab (including the face, feet, and front windshield of the cab, one of them or any combination) by adjusting the air distribution damper 6. During the cooling process, the humidity sensor 9 continuously monitors the humidity of the filter 21.

[0078] In combination Figure 4 When the humidity value exceeds the preset threshold value, the humidity sensor 9 sends a "filter 21 is saturated" signal to the controller. After receiving the signal, the controller automatically controls the fresh air damper 5 to close the passage between the fresh air outlet 101 and the inlet air chamber 104, cutting off the source of humid air, and controls the outlet 102 to be closed. Then control the bypass damper 72 to make the bypass passage 701 communicate with the outlet air chamber 105, and the return air from the return air outlet 103 is heated by the heater 4 and blown through the saturated filter 21. The hot air evaporates and carries away the water adsorbed by the filter 21, and is discharged outside the vehicle. When the humidity of the filter 21 is lower than the threshold value, the vehicle air conditioning system returns to the cooling mode before the automatic dehumidification mode.

[0079] In combination Figure 3 When the air conditioning system needs to heat, the controller controls the cool-hot damper 8 and the bypass damper 72 to be closed, and controls the fresh air damper 5 to be partially opened or fully opened. The cold air with certain humidity from the outside is filtered by the filter 21 to become dry air, which is mixed with the return air from the cab in the inlet air chamber 104, heated by the heater 4 after passing through the evaporator 3, and enters the outlet 102. According to the user's requirement of air supply mode, the hot air is delivered to the face, feet, and front windshield of the cab personnel, one of them or any combination by adjusting the air distribution damper 6.

[0080] In combination Figure 4When the air conditioning system is used for a period of time, the humidity sensor 9 continuously monitors the humidity of the filter element 21. When the humidity value exceeds the preset threshold value, the humidity sensor 9 sends a signal to the controller that the filter element 21 is saturated and needs to be regenerated. After receiving the signal, the controller automatically controls the fresh air door 5 to close the passage between the fresh air outlet 101 and the air inlet cavity 104, cutting off the source of humid air, and controls the outlet 102 to be closed. Then control the bypass door 72 to make the bypass passage 701 communicate with the air outlet cavity 105, the cab return air enters the air inlet cavity 104 through the return air outlet 103, first passes through the evaporator 3, and then passes through the heater 4 to be heated into dry return air. Dry indoor return air is blown to the filter element 21 through the bypass passage 701 to heat and dry the filter element 21, and the return air after passing through the filter element 21 is blown to the outside of the cab from the fresh air outlet 101. When the humidity sensor 9 detects that the humidity of the filter element 21 is lower than the threshold value, the vehicle air conditioning system returns to the previous heating mode.

[0081] The vehicle air conditioning system can actively dehumidify, all air passing through the drying filter 2 will be dehumidified first, and then enter the cab, while maintaining the freshness of the driving air quality, ensuring that the humidity in the cab does not increase, improving the safety performance of driving. Moreover, even in high humidity conditions, the fresh air function can be turned on all the time, dehumidified in winter, without the need to open the refrigeration system for dehumidification, the air conditioner will not blow cold air, and energy is saved. At the same time, it can also achieve the purpose of maintenance-free drying filter 2.

[0082] The above only describes optional embodiments of the present disclosure and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An indoor unit of a vehicle air conditioning system, characterized by comprising: The vehicle air conditioning system comprises: a shell (1) having a fresh air inlet (101), an air outlet (102) and a return air inlet (103); a dry filter (2) embedded in the fresh air inlet (101); an evaporator (3) located in the shell (1) and dividing the shell (1) into an air inlet cavity (104) and an air outlet cavity (105), the air inlet cavity (104) being in communication with the fresh air inlet (101) and the return air inlet (103) respectively, and the air outlet cavity (105) being in communication with the air outlet (102); a heater (4) located in the air outlet cavity (105) and used to work when the humidity of a filter core (21) in the dry filter (2) is higher than a threshold value; a fresh air damper (5) located at the fresh air inlet (101) and movably connected with the shell (1) and used to cut off the passage between the fresh air inlet (101) and the air inlet cavity (104) when the humidity of the filter core (21) is higher than the threshold value; a distribution damper (6) located at the air outlet (102) and movably connected with the shell (1) and used to close the air outlet (102) when the humidity of the filter core (21) is higher than the threshold value; a bypass assembly (7) connected with the shell (1) and having a bypass passage (701) inside, the bypass passage (701) being used to communicate the fresh air inlet (101) with the air outlet cavity (105) when the humidity of the filter core (21) is higher than the threshold value.

2. The indoor unit of claim 1, characterized in that, The air outlet cavity (105) is divided by the heater (4) into a first sub-cavity (1051) and a second sub-cavity (1052), and the first sub-cavity (1051) is arranged adjacent to the evaporator (3); The bypass assembly (7) comprises a bypass shell (71) and a bypass damper (72), the bypass shell (71) is located on one side of the shell (1), the bypass damper (72) is located at the connection between the second sub-cavity (1052) and the bypass passage (701) and is movably connected with the shell (1) to control the on-off of the bypass passage (701) and the second sub-cavity (1052) and the on-off of the second sub-cavity (1052) and the air outlet (102).

3. The indoor unit of claim 2, characterized in that, The bypass shell (71) is a long strip-shaped hollow plate structure, and the cavity inside the bypass shell (71) defines the bypass passage (701).

4. The indoor unit of claim 2, characterized in that, The vehicle air conditioning system further comprises a cold and hot damper (8) located in the first sub-cavity (1051), and the cold and hot damper (8) is movably connected with the shell (1) to control the on-off of the first sub-cavity (1051) and the air outlet (102).

5. The indoor unit of claim 2, wherein, The vehicle air conditioning system further comprises a humidity sensor (9), and a detection part of the humidity sensor (9) is connected with the filter core (21).

6. The indoor unit of claim 5, characterized in that, The vehicle air conditioning system further comprises a controller, and the controller is electrically connected with the humidity sensor (9) and the bypass damper (72), the fresh air damper (5), the distribution damper (6) and the cold and hot damper (8).

7. The indoor unit according to any one of claims 1-6, characterized by, The vehicle air conditioning system further comprises a fan (10) connected with the shell (1), and the suction port of the fan (10) is located in the air inlet cavity (104).

8. The indoor unit of claim 7, characterized in that, The suction port of the fan (10) is opposite to the air return port (103).

9. The indoor unit according to any one of claims 1-6, 8, characterized in that, The shell (1) comprises an upper half shell (11) and a lower half shell (12), the upper half shell (11) and the lower half shell (12) are buckled together, one end of the upper half shell (11) and one end of the lower half shell (12) define the fresh air port (101), the other end of the upper half shell (11) and the other end of the lower half shell (12) define the air outlet (102), and the air return port (103) is located between the upper half shell (11) and the lower half shell (12) and close to the area of the fresh air port (101).

10. A vehicle characterized by comprising: The vehicle comprises the indoor unit according to any one of claims 1-9.

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