Vehicle air conditioner and truck having the same

Abstract

The utility model discloses a kind of vehicle air conditioner and truck with it, belong to truck technical field, the vehicle air conditioner includes air conditioner host and negative ion generator, air conditioner host has air inlet air duct, in the air inlet direction of air inlet air duct, the flow area in air inlet air duct first decreases, then increases, negative ion generator is installed in air conditioner host, negative ion generator is used to generate negative ion in the position of minimum flow area. According to the vehicle air conditioner of the utility model embodiment, the flow area in air inlet air duct first decreases, then increases, negative ion generator generates negative ion in the position of minimum flow area, negative ion can be fully diffused in air inlet air duct along airflow, to improve the uniformity of negative ion and airflow inner air mixing, to improve the purification ability and purification effect flow of vehicle air conditioner to air.

Description

Technical Field

[0001] This utility model relates to the field of trucks, and more specifically, to a vehicle air conditioner and a truck having the same. Background Technology

[0002] Trucks are typically used for long-distance cargo transportation, which often requires drivers to drive continuously for extended periods in the passenger compartment. Passenger compartment comfort is a key concern for drivers. Truck air conditioning can not only regulate the temperature of the passenger compartment but also purify the air entering the passenger compartment to improve passenger comfort.

[0003] In related technologies, vehicle air conditioning typically purifies the air solely through a filter structure, resulting in a relatively simple purification effect. Furthermore, if the filter is not replaced regularly, the purification effect will decrease, affecting the comfort of the passenger cabin. Utility Model Content

[0004] This invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, this invention proposes a vehicle air conditioner that can improve the air purification effect of the vehicle air conditioner.

[0005] This utility model also proposes a truck with the above-mentioned vehicle air conditioning.

[0006] According to an embodiment of the present invention, a vehicle air conditioner includes: an air conditioning unit having an air intake duct, wherein the flow area within the air intake duct first decreases and then increases in the air intake direction; and a negative ion generator installed on the air conditioning unit, wherein the negative ion generator is used to generate negative ions at the location where the flow area is smallest.

[0007] According to an embodiment of the present invention, in the air intake direction of the air intake duct, the flow area inside the air intake duct first decreases and then increases. The negative ion generator is used to generate negative ions at the position with the smallest flow area. The negative ions can be fully diffused in the air intake duct with the airflow to improve the uniformity of the mixing of negative ions with the air in the airflow, thereby improving the air purification capacity and purification effect of the vehicle air conditioner.

[0008] According to some embodiments of this utility model, the flow area at the outlet of the air inlet duct is S1, and the minimum flow area of ​​the air inlet duct is S2, satisfying the relationship: 6≤S1 / S2≤14.

[0009] According to some embodiments of the present invention, the inner wall of the air inlet duct expands in a stepped manner at the point where its flow area increases.

[0010] According to some embodiments of the present invention, the negative ion generator includes: a high-voltage generator installed outside the air inlet duct; and an ionization electrode connected to the high-voltage generator, which passes through the air inlet duct, with one end of the ionization electrode located at the position with the smallest flow area within the air inlet duct.

[0011] According to some embodiments of the present invention, an installation groove is formed on the outside of the air inlet duct, and the high-voltage generator is installed in the installation groove.

[0012] According to some embodiments of the present invention, the flow area at the inlet of the air inlet duct is smaller than the flow area at the outlet of the air inlet duct.

[0013] According to some embodiments of the present invention, the vehicle air conditioner further includes an air inlet box, which is connected to the inlet of the air inlet duct.

[0014] According to some embodiments of the present invention, the air conditioning unit also has multiple air outlet ducts, each of which is connected to the outlet of the air inlet duct.

[0015] According to another embodiment of the present invention, a truck includes the above-described vehicle air conditioner.

[0016] According to the truck of this utility model embodiment, in the air intake direction of the air intake duct, the flow area in the air intake duct first decreases and then increases. The negative ion generator is used to generate negative ions at the position with the smallest flow area. The negative ions can be fully diffused in the air intake duct with the airflow to improve the uniformity of the mixing of negative ions with the air in the airflow, thereby improving the air purification capacity and purification effect of the vehicle air conditioner and improving the comfort of the passenger cabin.

[0017] According to some embodiments of the present invention, the vehicle air conditioner is located inside the front bulkhead of the truck. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description

[0018] Figure 1 This is a front view of a vehicle air conditioner according to an embodiment of the present utility model;

[0019] Figure 2 This is a left view of a vehicle air conditioner according to an embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 Enlarged view at point A;

[0021] Figure 4 yes Figure 2Cross-sectional view at BB;

[0022] Figure 5 This is a structural schematic diagram of the air conditioning unit and air inlet box at the connection point according to an embodiment of the present utility model;

[0023] Figure 6 This is a structural diagram of the vehicle air conditioner at the air outlet duct according to an embodiment of the present utility model.

[0024] Figure label:

[0025] Air conditioning unit 1; housing 11; air inlet duct 12; contraction section 121; expansion section 122; air outlet duct 13; mounting base 14; wiring harness slot 15;

[0026] Negative ion generator 2; High voltage generator 21; Power supply harness 211; Ionization electrode 22;

[0027] Air inlet box 3;

[0028] Car air conditioner 10. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The following describes in detail, with reference to the accompanying drawings, an in-vehicle air conditioner 10 and a truck having the same, according to embodiments of the present invention.

[0034] Reference Figures 1-6 As shown, the vehicle air conditioner 10 according to an embodiment of the present utility model includes: an air conditioning unit 1 and a negative ion generator 2. The air conditioning unit 1 has an air inlet duct 12. In the air inlet direction of the air inlet duct 12, the flow area in the air inlet duct 12 first decreases and then increases. The negative ion generator 2 is installed on the air conditioning unit 1. The negative ion generator 2 is used to generate negative ions at the position with the smallest flow area.

[0035] The vehicle air conditioner 10 can be used in vehicles, such as cars, SUVs, and trucks. The air conditioning unit 1 includes a housing 11, an evaporator, and a heater. The housing 11 defines an air inlet duct 12. The evaporator and heater can be installed inside the housing. Air can enter the housing 11 from the air inlet duct 12, and after the temperature is regulated by the evaporator or heater, it flows into the vehicle's cabin to regulate the cabin temperature.

[0036] In the air intake direction of the air intake duct 12, the flow area within the air intake duct 12 first decreases and then increases. The air intake direction of the air intake duct 12 can be... Figures 4-6 In the direction from front to back, that is, the air intake duct 12 can form a contraction section 121 with a gradually decreasing flow area and an expansion section 122 with a gradually increasing flow area. When air passes through the air intake duct 12 from front to back, it forms an airflow. The airflow is affected by the change in flow area. The airflow will accelerate in the contraction section 121 and diffuse in the expansion section 122. The air intake duct 12 can be a Laval nozzle-like structure.

[0037] Negative ion generator 2 is installed in air conditioner unit 1. Negative ion generator 2 can ionize molecules such as O and H2O in the air to produce O2. - OH - Negative ions can diffuse with airflow and combine with charged particles such as PM2.5 and dust, causing them to settle. Some negative ions can also oxidize and decompose formaldehyde, as well as odor molecules such as benzene and ammonia. In addition, negative ions can destroy the protein structure on the surface of bacteria and viruses, thereby inhibiting the growth of microorganisms.

[0038] The negative ion generator 2 generates negative ions at the position with the smallest flow area. That is, the negative ion generator 2 generates negative ions between the contraction section 121 and the expansion section 122 of the air intake duct 12. After the airflow in the air intake duct 12 is accelerated through the contraction section 121, it mixes with the negative ions generated by the negative ion generator 2. Then, as the airflow diffuses in the expansion section 122, the negative ions can diffuse fully with the airflow to improve the uniformity of the mixing of negative ions with the air in the airflow. This helps to reduce the number of negative ion generators 2 used and reduce the manufacturing and assembly costs of the vehicle air conditioner 10.

[0039] According to the embodiment of the present invention, in the air intake duct 10, the flow area in the air intake duct 12 first decreases and then increases in the air intake direction. The negative ion generator 2 is used to generate negative ions at the position with the smallest flow area. The negative ions can be fully diffused in the air intake duct 12 with the airflow to improve the uniformity of the mixing of negative ions with the air in the airflow, thereby improving the air purification capacity and purification effect of the vehicle air conditioner 10.

[0040] In some embodiments of this utility model, reference is made to Figure 6 As shown, the flow area at the outlet of the air inlet duct 12 is S1, and the minimum flow area of ​​the air inlet duct 12 is S2, satisfying the relationship: 6≤S1 / S2≤14.

[0041] Specifically, in the air intake direction of the air intake duct 12, the outlet of the air intake duct 12 is the downstream end of the air intake duct 12 (i.e. Figure 6 The minimum flow area of ​​the air intake duct 12 can be located in the middle of the air intake duct 12 (i.e., at the junction of the contraction section 121 and the expansion section 122). The flow area S1 at the outlet of the air intake duct 12 is 6 to 14 times the minimum flow area S2 of the air intake duct 12, so that negative ions can be fully diffused in the expansion section 122 of the air intake duct 12 with the airflow, and the uniformity of the mixing of negative ions with the air in the airflow can be better improved.

[0042] Understandably, if S1 / S2 < 6, negative ions are prone to insufficient diffusion when passing through the air inlet duct 12; if S1 / S2 > 14, the air pressure drop at the outlet of the air inlet duct 12 is too large, reducing the air intake speed of the air conditioning unit 1. Preferably, S1 / S2 = 9, thereby ensuring the air intake speed of the air conditioning unit 1 while allowing negative ions to diffuse sufficiently.

[0043] In some embodiments of this utility model, reference is made to Figure 6 As shown, the inner wall of the air inlet duct 12 expands in a stepped manner at the point where its flow area increases.

[0044] Specifically, in the expansion section 122 of the air inlet duct 12, where the flow area gradually increases, the inner wall of the air inlet duct 12 expands in a stepped manner. That is to say, in the air inlet direction of the air inlet duct 12, i.e. Figure 6 In the direction from front to back, the inner wall of the expansion section 122 is a non-smoothly expanding curved surface. The process of the flow area of ​​the expansion section 122 gradually increasing is non-uniform. The inner wall of the expansion section 122 expands in a stepped manner. As a result, the flow velocity and direction of the airflow change when it flows through the inner wall of the stepped structure of the expansion section 122, so as to form turbulence. Negative ions can be more fully mixed with the air in the airflow under the action of turbulence, so as to better improve the uniformity of the mixing of negative ions with the air in the airflow.

[0045] In some embodiments of this utility model, reference is made to Figure 1 , Figure 3 and Figure 4 As shown, the negative ion generator 2 includes a high-voltage generator 21 and an ionization electrode 22. The high-voltage generator 21 is installed outside the air inlet duct 12, and the ionization electrode 22 is connected to the high-voltage generator 21. The ionization electrode 22 passes through the air inlet duct 12, and one end of the ionization electrode 22 is located at the position with the smallest flow area inside the air inlet duct 12.

[0046] The high-voltage generator 21 can be installed on the outside of the air inlet duct 12 by means of snap-fit, adhesive, or fastener connection. The high-voltage generator 21 may include an oscillation circuit, a step-up transformer, and a rectifier circuit connected in sequence. The high-voltage generator 21 can convert low-voltage DC power (e.g., 12V) into high-voltage DC power (e.g., 5kV). The ionization electrode 22 is electrically connected to the high-voltage generator 21. The ionization electrode 22 can be made of corrosion-resistant metal materials such as tungsten or titanium into a needle-like structure. The high-voltage generator 21 can supply power to the ionization electrode 22, so that a high-voltage electric field is formed at one end of the ionization electrode 22 inside the air inlet duct 12 and electrons are released. The electrons combine with molecules such as O and H2O in the air to produce O2. - OH - Negative ions.

[0047] In the above example, the high-voltage generator 21 is installed outside the air inlet duct 12, which facilitates the installation and maintenance of the high-voltage generator 21 and avoids the high-voltage generator 21 blocking the airflow in the air inlet duct 12, reducing airflow resistance and improving the air intake efficiency of the air inlet duct 12. One end of the ionization electrode 22 is located in the position with the smallest flow area in the air inlet duct 12 to improve the uniformity of negative ion diffusion.

[0048] In some other embodiments of this utility model (not shown in the figure), the negative ion generator 2 includes a high voltage generator 21 and an ionization electrode 22. The high voltage generator 21 can be installed inside the air intake duct 12. The ionization electrode 22 is connected to the high voltage generator 21. The ionization electrode 22 is located at the position with the smallest flow area in the air intake duct 12. The high voltage generator 21 located inside the air intake duct 12 is less likely to interfere with other components in the vehicle, thereby improving the versatility of the vehicle air conditioner 10.

[0049] In some embodiments of this utility model (not shown in the figure), the negative ion generator 2 includes: a high-voltage generator 21, a high-voltage wire, and an ionization electrode 22. The high-voltage generator 21 is electrically connected to the ionization electrode 22 through the high-voltage wire. The high-voltage generator 21 can be installed on the compressor of the air conditioning unit 1. The compressor and the high-voltage generator 21 can share the same power supply port to facilitate the power supply to the high-voltage generator 21. The ionization electrode 22 can be fixed in the position with the smallest flow area in the air intake duct by means of snap-fit, screw-fit, plug-in, etc. The high-voltage generator 21 can supply power to the ionization electrode 22 through the high-voltage wire. The setting of the high-voltage wire allows the high-voltage generator 21 and the ionization electrode 22 to be arranged in different positions of the air conditioning unit 1, so as to improve the flexibility of the arrangement of the high-voltage generator 21, reduce the risk of interference between the high-voltage generator 21 and other components in the vehicle, thereby improving the versatility of the vehicle air conditioning unit 10.

[0050] In some embodiments of this utility model, reference is made to Figure 3 and Figure 4 As shown, an installation groove is formed on the outside of the air inlet duct 12, and the high-pressure generator 21 is installed in the installation groove.

[0051] The air inlet duct 12 can be an hourglass-shaped (two hollow frustums connected at the top) structure. The external mounting groove of the air inlet duct 12 corresponds to the position with a smaller flow area inside the air inlet duct 12. The air inlet duct 12 can be injection molded, and at least part of the high-pressure generator 21 can be embedded in the mounting groove.

[0052] In the above embodiment, the high-voltage generator 21 is installed in the mounting groove outside the air intake duct 12, thereby reducing the outward protrusion of the high-voltage generator 21 relative to the air conditioning unit 1, improving the space utilization of the vehicle air conditioner 10, and reducing the risk of interference between the high-voltage generator 21 and other components in the vehicle. For example, for left-hand drive vehicles and right-hand drive vehicles for overseas export models, the high-voltage generator 21 installed in the mounting groove is less likely to interfere with its external steering mechanism, thereby improving the structural versatility of the vehicle air conditioner 10 and facilitating the platformization of the vehicle air conditioner 10.

[0053] Reference Figures 1-4As shown, the mounting groove is annular and located in the middle of the air inlet duct 12. The high-voltage generator 21 can be installed on the left side of the external mounting groove of the air inlet duct 12 to facilitate the assembly and maintenance of the high-voltage generator 21.

[0054] In some embodiments of this utility model, reference is made to Figure 3 As shown, the mounting groove has a mounting base 14, and the high-voltage generator 21 is detachably connected to the mounting base 14 by fasteners.

[0055] The mounting base 14 may have a mounting hole, and the fastener may be a fastening screw, which may pass through the housing of the high voltage generator 21 and be threaded into the mounting hole. Alternatively, the fastener may be an expansion screw, which may pass through the housing of the high voltage generator 21 and be fastened into the mounting hole.

[0056] It should be noted that there can be multiple mounting bases 14 and multiple fasteners. Each fastener corresponds to one mounting base 14. The high-voltage generator 21 can be connected to the corresponding mounting base 14 through multiple fasteners to improve the stability and reliability of the connection between the high-voltage generator 21 and the air inlet duct 12.

[0057] In the above embodiment, the high voltage generator 21 is detachably connected to the mounting base 14 by fasteners, making the installation and disassembly of the high voltage generator 21 more convenient, so as to facilitate the assembly and maintenance of the high voltage generator 21.

[0058] In some embodiments of this utility model, reference is made to... Figure 3 As shown, the air conditioning unit 1 also has a wiring harness slot 15, and the power supply harness 211 of the high voltage generator 21 is connected to the wiring harness slot 15.

[0059] The power supply harness 211 can be used to supply power to the high voltage generator 21. The housing 11 of the air conditioner unit 1 can be formed with a harness slot 15 during injection molding to improve the integration of the housing 11. Alternatively, a harness clip can be installed on the housing 11, and the harness clip can form a harness slot 15. The harness slot 15 can be a U-shaped structure. The harness slot 15 can be interference-fitted with the power supply harness 211 so that the power supply harness 211 can be snapped and fixed in the harness slot 15.

[0060] It should be noted that there can be multiple wire harness slots 15, so as to fix the power supply wire harness 211 through multiple wire harness slots 15 and control the wiring layout of the power supply wire harness 211.

[0061] In the above embodiment, the power supply harness 211 of the high voltage generator 21 is connected to the harness slot 15 of the air conditioning unit 1 to fix the power supply harness 211, prevent the harness 211 from shaking and wearing, and improve the reliability and service life of the vehicle air conditioner 10.

[0062] In some embodiments of this utility model, reference is made to... Figures 4-6 As shown, the flow area at the inlet of the air inlet duct 12 is smaller than the flow area at the outlet of the air inlet duct 12.

[0063] The smaller flow area at the inlet of the air intake duct 12 forces the airflow to accelerate, enhancing the air intake power. The high-speed airflow can quickly enter the air intake duct 12. After entering the air intake duct 12, the flow area continues to decrease until it reaches the position of the ionization electrode 22, after which the flow area gradually increases. The flow area first contracts and then expands, and the airflow can form a Laval nozzle effect. The airflow accelerates in the contraction section 121 and diffuses in the expansion section 122. The larger flow area at the outlet of the air intake duct 12 slows down the airflow velocity, thereby prolonging the mixing time between negative ions and the air in the airflow and improving the uniformity of negative ion diffusion.

[0064] In the above embodiment, the air inlet duct 12 of the air conditioning unit 1 adopts the design of "small inlet and large outlet". The small inlet flow area of ​​the air inlet duct 12 can force the airflow to accelerate and increase the air intake speed. The high-speed airflow diffuses in the expansion section 122. The large outlet flow area of ​​the air inlet duct 12 can prolong the airflow residence time and promote the uniformity of negative ions and airflow mixing.

[0065] In some embodiments of this utility model, reference is made to Figure 5 As shown, the vehicle air conditioner 10 also includes an air inlet box 3, which is connected to the inlet of the air inlet duct 12.

[0066] The air inlet box 3 may include a blower, an air damper, and a filter element. The blower may be a motor-driven centrifugal impeller, which generates negative pressure by rotating to draw in external air. The speed can be controlled by PWN (Pulse Width Modulation) to achieve multiple fan speed settings, driving air into the air inlet duct 12 to provide basic airflow for the air conditioning system. The air damper may be located upstream or downstream of the blower. The air damper is driven by a micro stepper motor or a vacuum driver and can adjust the gas flow rate from the air inlet box 3 to the air inlet duct 12. The filter element may be located upstream of the blower and may include a non-woven fabric pre-filter layer (intercepting large particles), an electrostatic electret fiber layer (capturing particles larger than PM0.3), and an activated carbon layer, which can be used to filter particulate matter in the air and adsorb odors and harmful gases.

[0067] In the above embodiment, the air inlet box 3 is connected to the inlet of the air inlet duct 12. The air inlet box 3 can draw in air and supply it to the air inlet duct 12 to improve the air intake efficiency of the air inlet duct 12.

[0068] In some embodiments of this utility model, reference is made to Figure 4As shown, the air conditioning unit 1 also has multiple air outlet ducts 13, each of which is connected to the outlet of the air inlet duct 12.

[0069] Specifically, the number of air outlet ducts 13 of the air conditioning unit 1 is designed according to the space and needs of the vehicle interior. The air outlet ducts 13 can be distributed in different positions of the air conditioning unit 1 to deliver filtered and temperature-controlled air to different areas of the vehicle interior, achieving zoned temperature regulation. Each air outlet duct 13 can be equipped with an independent control valve to adjust the airflow. The negative ion generator 2 at the air inlet duct 12 ensures that the airflow from the air inlet duct 12 to each air outlet duct 13 has a uniform distribution of negative ions. This ensures that the air purification effect remains consistent when each air outlet duct 13 regulates the temperature in its zone, avoiding excessively high or low concentrations of negative ions in certain areas.

[0070] According to the truck of the present invention, the vehicle air conditioner 10 of the above embodiment is described.

[0071] According to the embodiments of the present invention, in the air intake duct 12 of the truck, the flow area inside the air intake duct 12 first decreases and then increases in the air intake direction. The negative ion generator 2 is used to generate negative ions at the position with the smallest flow area. The negative ions can be fully diffused in the air intake duct 12 with the airflow to improve the uniformity of the mixing of negative ions with the air in the airflow, thereby improving the air purification capacity and purification effect of the vehicle air conditioner 10 and improving the comfort of the passenger cabin.

[0072] In some embodiments of this utility model, the vehicle air conditioner 10 is located inside the front cover of the truck.

[0073] Specifically, the truck can be a new energy heavy-duty truck. The front bulkhead is located above the front bumper of the truck, and its upper part can extend to the bottom of the windshield. It connects to the side panels of the cab on both sides. The front bulkhead can be made of metal or composite materials. The front bulkhead can be used to reduce the vehicle's wind resistance and resist collision impacts. The vehicle air conditioner 10 is located inside the front bulkhead of the truck. When the vehicle air conditioner 10 needs maintenance, the front bulkhead can be opened at the front of the truck to facilitate the disassembly and repair of the vehicle air conditioner 10 by maintenance personnel.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A vehicle air conditioner characterized by comprising: include: An air conditioning unit (1) has an air inlet duct (12). In the air inlet direction of the air inlet duct (12), the flow area inside the air inlet duct (12) first decreases and then increases. A negative ion generator (2) is installed on the air conditioner unit (1) and is used to generate negative ions at the location with the smallest flow area.

2. The vehicle air conditioner according to claim 1, characterized by The flow area at the outlet of the air inlet duct (12) is S1, and the minimum flow area of ​​the air inlet duct (12) is S2, satisfying the relationship: 6≤S1 / S2≤14.

3. The vehicle air conditioner according to claim 1, characterized by The air inlet duct (12) expands in a stepped manner on the inner wall where its flow area increases.

4. The vehicle air conditioner according to claim 1, characterized by The negative ion generator (2) includes: A high-voltage generator (21) is installed outside the air inlet duct (12); An ionization electrode (22) is connected to the high-voltage generator (21). The ionization electrode (22) is installed in the air inlet duct (12). One end of the ionization electrode (22) in the air inlet duct (12) is located at the position with the smallest flow area.

5. The vehicle air conditioner according to claim 4, characterized by An installation groove is formed on the outside of the air inlet duct (12), and the high-voltage generator (21) is installed in the installation groove.

6. The vehicle air conditioner according to claim 1, characterized by The flow area at the inlet of the air inlet duct (12) is smaller than the flow area at the outlet of the air inlet duct (12).

7. The vehicle air conditioner according to any one of claims 1 to 6, characterized by The vehicle air conditioner also includes an air inlet box (3), which is connected to the inlet of the air inlet duct (12).

8. The vehicle air conditioner according to claim 7, characterized in that, The air conditioning unit (1) also has multiple air outlet ducts (13), each of which is connected to the outlet of the air inlet duct (12).

9. A truck characterized in that Including the vehicle air conditioner according to any one of claims 1-8.

10. The truck of claim 9, wherein, The vehicle air conditioner is located inside the front bulkhead of the truck.

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