Refrigerated vehicle low wind resistance flow guide device and refrigerated vehicle

Abstract

The application relates to a low-wind-resistance flow guide device of a refrigeration truck and the refrigeration truck. The flow guide device comprises a main flow guide cover arranged between a cooling device and a cab, the main flow guide cover comprises a first side, a second side and a third side, the first side is arranged against the cab, the second side is arranged against a truck compartment, and at least part of the third side is provided with a flow guide gap between the cooling device; side flow guide covers are arranged between the cab and the truck compartment, and the side flow guide covers are at least two, the at least two side flow guide covers are arranged on opposite sides of the cab in a first direction, and the side flow guide covers are arranged against the first side. The application effectively disperses air flow and reduces the wind resistance of the cooling device and the truck compartment; the main flow guide cover and the cooling device are provided with the flow guide gap, the gap can make part of the air flowing along the main flow guide cover enter the gap and enter the cooling device from bottom to top to participate in heat exchange, the heat dissipation air flow path of the cooling device is optimized, and the overall wind resistance of the refrigeration truck is not increased.

Description

Technical Field

[0001] This application relates to the field of refrigerated truck technology, and in particular to a low wind resistance airflow guiding device for refrigerated trucks and a refrigerated truck. Background Technology

[0002] With the development of the logistics industry, the demand for refrigerated trucks will further increase. Therefore, the structural optimization of refrigerated trucks has become an increasingly important focus in the field. Due to the special structure of refrigerated trucks, the fairing structure in related technologies is not suitable for refrigerated trucks, and the traditional fairing structure has the problem of excessive wind resistance caused by unreasonable flow field. Summary of the Invention

[0003] Therefore, it is necessary to provide a low-wind-resistance airflow guiding device and a refrigerated truck with a reasonable flow field design to address the above-mentioned technical problems.

[0004] On one hand, a low-drag airflow guiding device for refrigerated trucks is provided, disposed between the cab and the cargo compartment of the refrigerated truck. A cooling device is provided on the side of the cargo compartment facing the cab, and the cooling device is located above the cab. The airflow guiding device includes:

[0005] A main airflow fairing is disposed between the cooling device and the driver's cab. The main airflow fairing includes a first side, a second side, and a third side. The first side abuts against the driver's cab, the second side abuts against the passenger compartment, and at least a portion of the third side has a flow guide between it and the cooling device. The flow guide is connected to the heat dissipation passage of the cooling device.

[0006] Side fairings are disposed between the cab and the cargo compartment. At least two side fairings are provided on opposite sides of the cab in a first direction, and the side fairings are disposed against the first side. The first direction is defined as a direction that is perpendicular to the forward direction of the refrigerated truck and parallel to the road surface on which the refrigerated truck travels.

[0007] In one embodiment, the main flow shield includes a first main flow portion and a second main flow portion, the second main flow portion being located on opposite sides of the first main flow portion in a first direction, the first main flow portion and the second main flow portion being located between the first side and the second side; the first main flow portion includes an upper edge facing the cooling device, the upper edge forming part of the third side, and a gap being present between the upper edge and the cooling device.

[0008] In one embodiment, the first main flow section includes a flow guide groove recessed toward a second direction; the second direction is defined as the direction opposite to the forward direction of the refrigerated truck, and the second direction is perpendicular to the first direction.

[0009] In one embodiment, the second main flow section is provided with a snap-fit ​​portion for connection with the cab.

[0010] In one embodiment, the second main flow section includes a buffer section and a dispersion section; the buffer section abuts against the top surface of the cab, and the orthographic projection of the buffer section onto the top surface is located within the top surface; the dispersion section has a second side edge and is configured to abut against the side fairing.

[0011] In one embodiment, the air deflector further includes a fixing assembly capable of connecting the main air deflector and the side air deflectors to the cab. The fixing assembly includes a first fixing member and a second fixing member, the first fixing member being configured to connect the main air deflector and the side air deflectors, and the second fixing assembly being configured to connect the side air deflectors to the cab.

[0012] In one embodiment, the side fairing includes a first side fairing and a second side fairing, the first side fairing and the second side fairing being respectively disposed on opposite sides of the cab in a first direction; the first side fairing is provided with an air inlet, the second side fairing is provided with an air outlet, and the air inlet and the air outlet are connected.

[0013] On the one hand, a refrigerated truck is provided, including the aforementioned low wind resistance airflow guiding device for refrigerated trucks.

[0014] In one embodiment, the cooling device includes an airflow inlet and an airflow outlet, the airflow inlet being located on the side of the cooling device closer to the gap, and the airflow outlet being located on the side of the cooling device farther from the cab.

[0015] In one embodiment, the vehicle compartment includes a front wall and a side wall perpendicular to the front wall; the front wall is disposed toward the driver's cab and is provided with a cooling device; the side fairing abuts between the front wall and the driver's cab, and the outer surface of the side fairing forms an angle with the plane of the side wall.

[0016] The aforementioned refrigerated truck and its low-drag airflow guiding device effectively disperse airflow and reduce the increased airflow resistance of the cooling device and the truck body by combining the main airflow shield and the side airflow shield. There is a gap between the main airflow shield and the cooling device, which allows a portion of the gas flowing along the main airflow shield to enter into it and enter the cooling device from bottom to top to participate in heat exchange, thus optimizing the heat dissipation airflow path of the cooling device without increasing the overall airflow resistance of the refrigerated truck. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a refrigerated truck structure according to an embodiment of this application.

[0018] Figure 2 This is a front view of the main fairing according to an embodiment of this application.

[0019] Figure 3 This is a top view of the main fairing according to an embodiment of this application.

[0020] Figure 4 This is a front view of a side fairing according to an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the disassembled structure of the flow guiding device and the driver's cab according to an embodiment of this application. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly 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 or an electrical connection; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0028] Research has found that when vehicle speed exceeds 90 km / h, approximately 65% ​​of the fuel consumption of heavy-duty trucks is used to overcome air resistance, making reducing wind resistance one of the main means of reducing fuel consumption. In related technologies, refrigerated trucks equipped with independent refrigeration units generally have higher wind resistance, and therefore higher fuel consumption. While fairings can be used to reduce wind resistance, the fairing structures in traditional vehicles are not suitable for refrigerated trucks, and traditional fairing structures suffer from unreasonable flow fields, resulting in an inability to effectively reduce wind resistance. Therefore, this application provides a low-wind-resistance airflow guiding device for refrigerated trucks to meet the demand for low fuel consumption in refrigerated trucks.

[0029] See Figure 1 , Figure 1This diagram illustrates the structure of a low-drag airflow guiding device for a refrigerated truck 1 according to an embodiment of this application. The airflow guiding device 100 provided in this embodiment is suitable for a refrigerated truck 1, which also includes a cargo compartment 400, a cooling device 200, and a driver's cab 300. The airflow guiding device 100 is disposed between the driver's cab 300 and the cargo compartment 400 of the refrigerated truck 1. The cooling device 200 is provided on the side of the cargo compartment 400 facing the driver's cab 300, and is located above the driver's cab 300, that is, on the side of the driver's cab 300 away from the road surface on which the refrigerated truck 1 travels.

[0030] The cooling device 200 primarily achieves the required refrigeration temperature through the circulation of refrigerant. The cooling device 200 typically consists of a compressor, a condenser, an evaporator, and a control system. The compressor compresses the refrigerant to a high-temperature, high-pressure state, then the condenser cools the refrigerant, turning it into a high-pressure liquid. Finally, the evaporator evaporates the high-pressure liquid refrigerant into low-temperature, low-pressure vapor, thus achieving the cooling effect inside the refrigerated truck 1. At least a portion of the cooling device 200 is located outside the refrigerated truck 1, allowing the condenser to cool the refrigerant through heat exchange with the outside. Furthermore, the compressor, condenser, or control device of the cooling device 200 can be integrated and located outside the truck compartment 400. In this embodiment, the cooling device 200 specifically refers to the structure located outside the truck compartment 400.

[0031] The air deflector 100 includes a main air deflector 110 and side air deflectors 120. The main air deflector 110 is disposed between the cooling device 200 and the cab 300, and the side air deflectors 120 are disposed between the cab 300 and the cargo compartment 400. The main air deflector 110 includes a first side 111, a second side 112, and a third side 113. The first side 111 is disposed against the cab 300, the second side 112 is disposed against the cargo compartment 400, and at least a portion of the third side 113 has an air deflector 130 between itself and the cooling device 200, the air deflector 130 communicating with the heat dissipation passage of the cooling device 200. At least two side air deflectors 120 are included, and at least two side air deflectors 120 are disposed on opposite sides of the cab 300 in a first direction X, and the side air deflectors 120 abut against the first side 111. The first direction X is defined as a direction perpendicular to the forward direction of the refrigerated truck 1 and parallel to the road surface on which the refrigerated truck 1 travels. The main fairing 110 and the side fairings 120 enclose the space between the cab 300, the cooling unit 200 and the carriage 400.

[0032] The main fairing 110 is arched in shape. Since the cab 300 is positioned relatively far from the cooling device 200 in the second direction, the arched main fairing 110 connects the cab 300 and the cooling device 200, creating a gradually widening stepped surface from the top surface of the cab 300 to the cooling device 200. The second direction Y is defined as the direction opposite to the forward direction of the refrigerated truck 1, and the second direction Y is perpendicular to the first direction X.

[0033] like Figure 2 , Figure 3 As shown, the main flow shield 110 includes a first main flow section 114 and a second main flow section 115. The second main flow section 115 is located on opposite sides of the first main flow section 114 in a first direction X, and the first main flow section 114 and the second main flow section 115 are located between a first side 111 and a second side 112. A guide port 130 is provided between the first main flow section 114 and the cooling device 200. The first main flow section 114 and the second main flow section 115 extend in different directions, forming an arched main flow shield 110. The lower edge of the first main flow section 114 and the second main flow section 115 together forms the first side 111, and the upper edge of the first main flow section 114 and the second main flow section 115 together forms the third side 113.

[0034] The first main airflow section 114 is arc-shaped. The lower edge of the first main airflow section 114 is close to the side of the top surface of the cab 300 facing the direction of travel of the vehicle, so that the windshield of the cab 300 and the first main airflow section 114 have a small gap in the second direction Y. The minimum straight-line gap between the windshield of the cab 300 and the first main airflow section 114 in the second direction Y is less than or equal to 12% of the width of the cab 300 in the second direction Y. The windshield of the cab 300 and the first main airflow section 114 form an angle, which is less than or equal to 20°. The upper edge of the first main airflow section 114 is arranged around the lower edge of the cooling device 200, and a guide opening 130 is provided between the upper edge of the first main airflow section 114 and the lower edge of the cooling device 200. Furthermore, the upper edge of the first main airflow section 114 matches the shape of the lower edge of the cooling device 200. It can be understood that "upper" and "lower" in this embodiment refer to the relative positional relationship in the third direction Z. The third direction Z is defined as the direction the refrigerated truck 1 is facing on the road surface. The third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

[0035] The cooling device 200 includes an airflow inlet and an airflow outlet 210, which connect to a heat dissipation passage within the cooling device 200. The airflow inlet is located on the side of the cooling device 200 near the guide port 130 and is oriented towards the direction of travel of the refrigerated truck 1 and / or towards the cab 300. In this embodiment, the airflow inlet includes a first airflow inlet 220 oriented towards the direction of travel of the refrigerated truck 1 and a second airflow inlet (not shown in the figure) oriented towards the cab 300. The airflow outlet 210 is located on the side of the cooling device 200 away from the cab 300 and is oriented towards the third direction Z. By providing the guide port 130, a portion of the gas flowing along the first main flow section 114 enters the guide port 130 and enters the cooling device 200 from bottom to top through the guide port 130 via the second airflow inlet to participate in heat exchange, while another portion of the gas flowing along the first main flow section 114 enters the cooling device 200 from the first airflow inlet 220 to participate in heat exchange.

[0036] Furthermore, the maximum width of the guide port 130 accounts for 5-30% of the straight-line width of the main flow shield 110 in the second direction Y. Preferably, the maximum width of the guide port 130 accounts for 10%, 15%, or 20% of the straight-line width of the main flow shield 110 in the second direction Y. If the proportion of the guide port 130 is too large, it will cause disturbance and affect the stability of the flow field. If the proportion is too small, it will not provide sufficient air intake. When the maximum width of the guide port 130 accounts for 5-30% of the straight-line width of the main flow shield 110 in the second direction Y, the airflow can be effectively and smoothly introduced from the guide port 130.

[0037] The first main flow section 114 includes a guide groove 1141 recessed in the second direction Y. The guide groove 1141 can divide the airflow passing through the main flow cover 110 into a distribution flowing along the first main flow section 114 and a portion flowing towards the sides of the second main flow section 115, thereby reducing wind resistance. The guide groove 1141 is located in the middle of the first main flow section 114, corresponding to the position of the guide port 130, so that the airflow passing through the main flow cover 110 can more accurately enter the guide port 130 along the guide groove 1141.

[0038] The second main flow section 115 is provided with a snap-fit ​​portion 116 for connecting with the cab 300. Correspondingly, the top of the cab 300 is provided with a connecting portion (not shown in the figure) for connecting with the snap-fit ​​portion 116. In this embodiment, the snap-fit ​​portion 116 protrudes from the first side 111, and correspondingly, the connecting portion on the top surface of the cab 300 is a groove. In this embodiment, the snap-fit ​​portion 116 can be integrally formed with the second main flow section 115.

[0039] like Figure 3As shown, the second main flow section 115 includes a buffer section 1151 and a dispersion section 1152 arranged sequentially along the second direction Y. The buffer section 1151 abuts against the top surface of the cab 300, and the orthographic projection of the buffer section 1151 onto the plane containing the top surface lies within the top surface. The dispersion section 1152 has a second side 112 and is configured to abut against the side fairing 120 and the carriage 400. Specifically, the buffer section 1151 does not extend beyond the cab 300 in the first direction X. The buffer section 1151 is arc-shaped, and the arc-shaped buffer section 1151 can connect the cab 300 and the cooling device 200, which are spaced far apart. Furthermore, the buffer section 1151 can connect the side door of the cab 300 and the side surface of the cooling device 200, which are spaced far apart. The dispersion section 1152 is arranged substantially parallel to the side guide shroud 120, and can connect the spaced side guide shroud 120 and the side of the cooling device 200.

[0040] The carriage 400 includes a front wall 410 and a side wall 420 perpendicular to the front wall 410. The front wall 410 is perpendicular to a second direction, and the side wall 420 is perpendicular to a first direction X. The front wall 410 faces the driver's cab 300 and is equipped with a cooling device 200. A side fairing 120 abuts between the front wall 410 and the driver's cab 300, and the two sides of the side fairing 120 abut against the front wall 410 and the driver's cab 300 respectively match the shapes of the front wall 410 and the driver's cab 300. The outer surface of the side fairing 120 forms an angle with the plane containing the side wall 420. Specifically, the angle between the outer surface of the side fairing 120 and the plane of the side wall 420 is greater than the angle between the side of the cab 300 and the plane of the side wall 420, so that the side fairing 120 can smoothly connect the side wall 420 of the compartment 400 and the side of the cab 300. The airflow flowing from the side of the cab 300 is smoothly guided to the side wall 420 of the compartment 400, reducing the wind resistance caused by the wider compartment 400.

[0041] like Figure 4As shown, the side deflector 120 includes a first side deflector 121 and a second side deflector 122, which are respectively disposed on opposite sides of the cab 300 in the first direction X. The first side deflector 121 is provided with an air inlet 123, and the second side deflector 122 is provided with an air outlet 124, which are connected. Since the main deflector 110 and the side deflector 120 enclose the space between the cab 300, the cooling device 200, and the carriage 400, by providing the air inlet 123 and the air outlet 124, part of the airflow is introduced into the enclosed area. It can also participate in heat exchange through the second airflow inlet, and can also introduce the swirling airflow formed on the side of the cab 300 into the enclosed area for decomposition and flow out from the air outlet 124. It can also dissipate heat from the rear side wall 420 of the cab 300 through the flow of fluid. Specifically, the air inlet 123 and / or the air outlet 124 are in the shape of a grille, which makes the airflow more dispersed. In this embodiment, the air outlet 124 is in the shape of a grille, and the plane where the air outlet 124 is located has an angle with the approximate plane where the second side guide shield is located.

[0042] like Figure 5 As shown, the air deflector 100 further includes a fixing assembly 500 capable of connecting the main air deflector 110 and the side air deflectors 120 to the cab 300. The fixing assembly 500 includes a first fixing member 510 and a second fixing member 520. The first fixing member 510 is configured to connect the main air deflector 110 and the side air deflectors 120, and the second fixing assembly 500 is configured to connect the side air deflectors 120 to the cab 300. The first fixing member 510 and the second fixing member 520 each include multiple spaced apart. In this embodiment, the first fixing member 510 and the second fixing member 520 can also be integrated together. Furthermore, the second fixing assembly 500 is configured to connect the side air deflectors 120 to the back panel of the cab 300.

[0043] Specifically, the first fixing member 510 includes a first base 511 and a first rod 512. The first base 511 is connected to the side fairing 120, and the first rod 512 connects the first base 511 and the main fairing 110. In this embodiment, multiple second fixing members 520 are provided, and the multiple second fixing members 520 are spaced apart along the third direction Z between the side fairing 120 and the cab 300. Some of the multiple second fixing members 520 include a first connecting member 521 connecting the first base 511 and the cab 300, and some of the multiple second fixing members 520 include a second connecting member 522 connecting the side fairing and the cab 300. During assembly, the side fairing 120 is first assembled to the cab 300 using the second fastener 520, and then the main fairing 110 is assembled to the side fairing 120 and the cab 300 using the first fastener 510 and the snap-fit ​​part 116. This facilitates the installation and positioning of the main fairing 110, and the overall installation is convenient and the connection is stable.

[0044] It should be noted that the connection between the fairing and the top cover in the relevant technology is a bolt connection. This method requires the bolts to be driven through the fairing, resulting in the bolt heads being exposed on the outside of the fairing. After the vehicle and the fairing are assembled, the exposed bolt heads on the outside of the fairing detract from the overall aesthetics of the fairing. In addition, the fairing will have bolt mounting holes, which will damage the overall structure of the fairing to a certain extent.

[0045] The embodiment of this application uses a snap-fit ​​part 116 to snap the main fairing 110 to the cab 300, and the first fastener 510 internally connects the main fairing 110 and the side fairing 120. This structure only requires related fixing and connection operations on the inner surface of the main fairing 110, and will not cause much or no damage to the outer surface structure of the main fairing 110. As a result, after the main fairing 110 is assembled in the cab 300, there are no foreign object protrusions on the outer surface of the main fairing 110, and the overall structure of the main fairing 110 is less damaged. Since the fluid is mainly guided and diverted through the main fairing 110, the main fairing 110 can effectively reduce the generation of circumferential flow, thereby effectively reducing wind resistance.

[0046] A sealing layer (not shown in the figure) is provided between the airflow guide device 100 and the cab 300, the cargo box 400, and the cooling device 200. The sealing layer enhances the sealing performance of the airflow guide, ensuring that the airflow flows along the path defined by the airflow guide device 100, and strengthens the isolation between the cab 300 and the cargo box 400, thereby reducing the overall wind resistance of the refrigerated truck 1. The sealing layer can be a gasket or a sealant. When the sealing layer is a gasket, the material can be rubber or a polymer. Rubber has good elasticity and corrosion resistance; rubber materials can be nitrile rubber, fluororubber, or silicone rubber, etc. Polymers have good chemical corrosion resistance and high temperature resistance; polymer materials can be polytetrafluoroethylene (PTFE), polyimide (PI), etc. When the sealing layer is a sealant, the material can be butyl rubber, polyurethane, silicone rubber, or acrylate. The thickness of the sealing layer can be increased as needed. Increasing the thickness of the sealing layer can improve its filling and sealing effect, especially suitable for wider gaps or irregular surfaces. Filler materials, such as fibers, granules, or meshes, can be added to the sealing layer as needed.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A low-drag airflow guiding device for a refrigerated truck, disposed between the cab and the cargo compartment of the refrigerated truck, wherein a cooling device is provided on the side of the cargo compartment facing the cab, and the cooling device is located above the cab, characterized in that, The flow guiding device comprises: a main flow guide cover arranged between the cooling device and the cab, the main flow guide cover comprising a first side, a second side and a third side, the first side being arranged against the cab, the second side being arranged against the carriage, and at least part of the third side having a flow guiding opening between the cooling device, the flow guiding opening being in communication with a heat dissipation passage of the cooling device; and a side flow guide cover arranged between the cab and the carriage, the side flow guide cover comprising at least two side flow guide covers arranged on opposite sides of the cab in a first direction, and the side flow guide cover being arranged against the first side; the first direction being defined as a direction perpendicular to the moving direction of the refrigerator truck and parallel to the road surface on which the refrigerator truck travels. The main flow guide cover comprises a first main flow guide part and a second main flow guide part, the second main flow guide part being arranged on opposite sides of the first main flow guide part in the first direction, and the first main flow guide part and the second main flow guide part being arranged between the first side and the second side; the first main flow guide part comprises an upper edge facing the cooling device, the upper edge constituting part of the third side, and the upper edge having a gap with the cooling device.

2. The low-drag fairing for a refrigerated truck of claim 1, wherein, The first main flow guide part comprises a flow guiding groove recessed towards a second direction; the second direction being defined as a direction opposite to the moving direction of the refrigerator truck, and the second direction being perpendicular to the first direction.

3. The low-drag fairing for a refrigerated vehicle of claim 1, wherein, The second main flow guide part is provided with a clamping part for connecting with the cab.

4. The low-drag fairing for a refrigerated truck of claim 1, wherein, The second main flow guide part comprises a buffer part and a dispersion part; the buffer part is arranged against a top surface of the cab, and a normal projection of the buffer part on the top surface is located within the top surface; the dispersion part has the second side, and the dispersion part is arranged against the side flow guide cover.

5. The low-drag fairing for a refrigerated truck of claim 1, wherein, The flow guiding device further comprises a fixing assembly capable of connecting the main flow guide cover and the side flow guide cover to the cab, the fixing assembly comprising a first fixing part and a second fixing part, the first fixing part being configured to connect the main flow guide cover and the side flow guide cover, and the second fixing part being configured to connect the side flow guide cover and the cab.

6. The low-drag fairing for a refrigerated truck of claim 1, wherein, The side flow guide cover comprises a first side flow guide cover and a second side flow guide cover, the first side flow guide cover and the second side flow guide cover being arranged on opposite sides of the cab in the first direction; the first side flow guide cover is provided with an air inlet, and the second side flow guide cover is provided with an air outlet, the air inlet and the air outlet being in communication.

7. A refrigerated vehicle, characterized in that The flow guiding device of the refrigerator truck according to any one of claims 1 to 6.

8. The refrigerated vehicle of claim 7, wherein, The cooling device comprises an air inlet and an air outlet, the air inlet being located on a side of the cooling device close to the gap, and the air outlet being located on a side of the cooling device away from the cab.

9. The refrigerated vehicle of claim 7, wherein, The carriage comprises a front wall and a side wall perpendicular to the front wall; the front wall is arranged towards the cab, the front wall is provided with the cooling device, the side flow guide cover is arranged between the front wall and the cab, and an outer surface of the side flow guide cover has an included angle with a plane in which the side wall is located.

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