Cold air exhaust passage and refrigerated vehicle

Abstract

The utility model provides a cold air exhaust passage and refrigerated car belong to cold chain transportation technical field, including passageway body and a plurality of air ducts, passageway body is long strip structure, is used for fixed mounting in the top of car, and along the length direction of car arrangement, passageway body inside is equipped with along the length direction arrangement's air collecting chamber, and one end is equipped with the air inlet that links to each other with air collecting chamber, passageway body is equipped with a plurality of along the circumferential interval arrangement and links to each other with air collecting chamber's air outlet group, and a plurality of air outlets in air outlet group along the length direction of passageway body arrangement, air duct and air outlet group one to one correspondence, air duct is located in air collecting chamber, and is fixedly connected with passageway body, the lower end of air duct and air outlet butt joint, and air duct and air outlet coaxial arrangement, the cold air exhaust passage provided by the utility model greatly promotes the cold air flow evenness in car, makes the temperature difference of different areas in car greatly reduce, improves the cooling effect.

Description

Technical Field

[0001] This utility model belongs to the field of cold chain transportation technology, and more specifically, it relates to a cold air exhaust channel and a refrigerated vehicle. Background Technology

[0002] In modern logistics systems, cold chain logistics is a crucial link in ensuring the quality of perishable goods such as fresh food and pharmaceuticals. Its technological level directly determines the quality stability of goods from production to consumption. Refrigerated trucks, as the core transport vehicle in cold chain logistics, play a vital role in maintaining suitable storage temperatures for goods during long-distance transportation, and their refrigeration systems are the core support for achieving this function. The refrigeration system of a refrigerated truck mainly consists of a refrigeration unit, cold air delivery ducts, and a cargo compartment insulation structure. Its working principle is that the refrigeration unit generates low-temperature cold air, which is then distributed to various areas of the cargo compartment via ducts laid inside, thereby achieving overall cooling and preservation of the goods within the compartment.

[0003] Currently, refrigerated trucks mostly use fixed rectangular or circular pipe structures for cold air delivery. These pipes are typically laid along the top or side walls of the truck bed, with several air outlets on their surface. Low-temperature cold air is output from the refrigeration unit, flows through the pipes to the outlets, and then is discharged into the truck bed. However, this traditional pipe system easily results in the cold air flowing in a single direction, leading to poor uniformity of the cold airflow within the truck bed and directly affecting the cooling effect on the goods. Utility Model Content

[0004] The purpose of this utility model is to provide a cold air exhaust channel and a refrigerated truck to solve the technical problem that in the prior art, when the pipes exhaust cold air, the cold air is very likely to flow in a single direction, resulting in poor uniformity of cold air flow in the compartment, which directly affects the cooling effect of the goods.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cold air exhaust channel, comprising: The passage body is a long strip structure, used for fixed installation on the top of the carriage and arranged along the length of the carriage; the passage body has an air collecting chamber arranged along the length, and one end has an air inlet connected to the air collecting chamber; the passage body has multiple air outlet groups arranged circumferentially and connected to the air collecting chamber, and the multiple air outlets in the air outlet groups are arranged along the length of the passage body. There are multiple air ducts, each corresponding to one of the multiple air outlets; the air ducts are located inside the air collection chamber and are fixedly connected to the channel body; the lower end of the air duct is connected to the air outlet, and the air ducts and the air outlets are arranged coaxially.

[0006] In one possible implementation, the channel body includes a long, bent plate and an end plate. The long, bent plate has multiple mounting planes arranged sequentially along the circumference. Multiple air outlet groups correspond one-to-one with the multiple mounting planes, and the air outlets are respectively opened on the mounting planes. The upper two sides of the long, bent plate are used for fixed installation on the top of the carriage. One end of the long, bent plate is the air inlet and is fixedly installed at the front of the carriage. The end plate is fixedly installed at the other end of the long, bent plate and is used to close the air collection chamber.

[0007] In one possible implementation, long strip connecting plates are provided on both sides of the upper end of the long strip bent plate and on the upper end of the end plate, and one end of the long strip bent plate is provided with a bent connecting plate arranged in a conformal shape and surrounding the air inlet.

[0008] In one possible implementation, both the elongated butt plate and the bent butt plate are provided with mounting holes and fasteners for fixed connection.

[0009] In one possible implementation, both the elongated butt joint plate and the bent butt joint plate are provided with sealing gaskets.

[0010] In one possible implementation, multiple air outlets in two adjacent air outlet groups are arranged either aligned or staggered.

[0011] In one possible implementation, the exhaust duct is a straight pipe.

[0012] In one possible implementation, the lower end of the passage body is provided with an airflow outlet for forming an air curtain, and the airflow outlet is located on the side of the passage body near the rear of the carriage.

[0013] The beneficial effects of the cold air exhaust channel provided by this utility model are as follows: Compared with the prior art, during installation, the channel body is fixed to the top of the truck bed using bolts, clips, and other fasteners, ensuring that the channel body remains horizontal and stable along the length of the truck bed, preventing displacement due to vehicle movement. Simultaneously, one end of the channel body has an air inlet that connects to the cold air output end of the refrigeration unit of the refrigeration truck through a sealed connector, ensuring no cold air leakage at the connection. In use, when the refrigeration unit of the refrigeration unit is started, the low-temperature cold air generated by the refrigeration unit enters the air collection chamber of the channel body through the air inlet. After being buffered by the air collection chamber, the cold air enters each air duct under its own wind pressure, and is then guided by the air duct to the corresponding air outlet group. Finally, through the air outlets distributed circumferentially and along the length, the cold air is evenly discharged into the truck bed from multiple directions, achieving comprehensive cooling of the goods inside the truck bed. This structure significantly improves the uniformity of cold airflow within the carriage. The circumferentially spaced air outlets allow cold air to cover the carriage from multiple directions. Combined with the precise airflow guidance provided by the long-length air outlets and ductwork, it effectively avoids the problems of localized overcooling and undercooling common in traditional duct systems. This greatly reduces temperature differences between different areas within the carriage, ensuring all goods are kept in a suitable cooling environment. Furthermore, the buffering effect of the air collection chamber reduces air pressure fluctuations during cold air delivery, and the ductwork ensures that cold air is delivered to each outlet with stable volume, speed, and direction, further enhancing the cooling uniformity and overall cooling effect within the carriage.

[0014] Another objective of this invention is to provide a refrigerated truck, including any of the aforementioned cold air exhaust channels.

[0015] In one possible implementation, the number of cold air exhaust channels is multiple, and they are arranged in parallel at intervals.

[0016] This utility model provides a refrigerated truck. Due to the adoption of a cold air exhaust channel, the uniformity of cold air flow in the compartment is greatly improved. Through the circumferentially spaced air outlet group, cold air can cover the compartment from multiple directions. Combined with the precise air guiding effect of the air outlets arranged along the length direction and the air duct, the problem of local overcooling and undercooling in traditional pipelines is effectively avoided. This greatly reduces the temperature difference between different areas in the compartment and ensures that all goods are in a suitable refrigeration temperature environment. In addition, the buffering effect of the air collection chamber reduces the air pressure fluctuation during the cold air delivery process. Under the action of the air duct, the cold air can be delivered to each air outlet with a stable air volume, air speed and air direction, further improving the cooling uniformity in the compartment and improving the cooling effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Schematic diagram of the structure of the cold air exhaust channel provided in the embodiment of this utility model Figure 1 ; Figure 2 Schematic diagram of the structure of the cold air exhaust channel provided in the embodiment of this utility model Figure 2 ; Figure 3 Cross-sectional view of the cold air exhaust channel provided in the embodiment of this utility model Figure 1 ; Figure 4 Cross-sectional view of the cold air exhaust channel provided in the embodiment of this utility model Figure 2 ; Figure 5 Partial schematic diagram of the cold air exhaust channel provided in the embodiment of this utility model Figure 1 ; Figure 6 Partial schematic diagram of the cold air exhaust channel provided in the embodiment of this utility model Figure 2 ; Figure 7 Partial schematic diagram of the cold air exhaust channel provided in the embodiment of this utility model Figure 3 ; Figure 8 A schematic diagram of the structure of multiple cold air exhaust channels installed in the carriage according to an embodiment of this utility model.

[0019] The following are the labeling elements in the figure: 10. Channel body; 11. Air collection chamber; 12. Air inlet; 13. Air outlet assembly; 14. Air outlet; 15. Long strip bent plate; 16. End plate; 17. Mounting plane; 18. Long strip connecting plate; 19. Bent connecting plate; 20. Air duct; 30. Fastener; 31. Mounting hole; 32. Airflow outlet; 40. Carriage. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0023] 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 two or more, unless otherwise explicitly specified.

[0024] Please see Figures 1 to 8 The present invention provides a description of a cold air exhaust channel. A cold air exhaust channel includes a channel body 10 and an exhaust pipe 20. The channel body 10 is a long strip structure, used for fixed installation on the top of a vehicle compartment 40, and arranged along the length of the vehicle compartment 40. The channel body 10 has an air collecting chamber 11 arranged along its length, and one end has an air inlet 12 connected to the air collecting chamber 11. The channel body 10 has multiple air outlet groups 13 arranged circumferentially and connected to the air collecting chamber 11, with multiple air outlets 14 arranged along the length of the channel body 10. Multiple exhaust pipes 20 are provided, each corresponding to one of the multiple air outlets 14. The exhaust pipes 20 are located within the air collecting chamber 11 and are fixedly connected to the channel body 10. The lower end of the exhaust pipe 20 is connected to the air outlet 14, and the exhaust pipe 20 and the air outlet 14 are arranged coaxially.

[0025] Compared with the prior art, the cold air exhaust channel provided by this utility model has a long strip structure for the channel body 10, which not only adapts to the narrow space of the refrigerated truck compartment 40, but also ensures that the cold air delivery range covers the entire length of the compartment 40 by being fixedly installed on the top of the compartment 40 and arranged along the length of the compartment 40, thus avoiding local air delivery blind spots caused by improper layout of traditional pipelines. The air collection chamber 11 arranged along the length of the channel body 10 can temporarily store and buffer the low-temperature cold air delivered by the refrigeration unit, preventing unstable air delivery due to sudden changes in air pressure when the cold air is directly delivered. The air inlet 12 connected to one end of the air collection chamber 11 serves as a key interface for cold air input, which can be precisely connected to the air outlet 14 of the existing refrigeration unit of the refrigerated truck to ensure the cold air supply. The sealing and efficiency of the conveying system are crucial. More importantly, the channel body 10 is equipped with multiple circumferentially spaced air outlet groups 13 that communicate with the air collection chamber 11. Each air outlet group 13 contains multiple air outlets 14 arranged along the length of the channel body 10, breaking the limitation of traditional ducts that only allow air to flow in one direction. This allows cold air to be discharged from different circumferential directions of the channel body 10. The air intake pipes 20, corresponding one-to-one with the air outlet groups 13, precisely guide the cold air within the air collection chamber 11, ensuring that the cold air is stably delivered to each air outlet 14 along the axial direction of the air intake pipes 20. This prevents turbulence in the air collection chamber 11 from causing insufficient airflow in some outlets 14 and excessive airflow in others, further ensuring the stability and uniformity of air delivery from each outlet 14.

[0026] During installation, the passageway body 10 is fixed to the top of the compartment 40 using bolts, clips, and other fasteners, ensuring that the passageway body 10 remains horizontal and stable along the length of the compartment 40 to prevent displacement due to vehicle movement. Simultaneously, one end of the passageway body 10 has an air inlet 12, which is connected to the cold air output end of the refrigeration unit of the refrigeration truck via a sealed connector to ensure no cold air leakage at the connection. During use, the refrigeration unit of the refrigeration truck is started. The low-temperature cold air generated by the refrigeration unit enters the air collection chamber 11 of the passageway body 10 through the air inlet 12. After being buffered by the air collection chamber 11, the cold air enters each air duct 20 under its own wind pressure, and is then guided by the air duct 20 to the corresponding air outlet group 13. Finally, it is evenly discharged into the compartment 40 from multiple directions through the air outlets 14 distributed circumferentially and along the length, achieving comprehensive cooling of the goods inside the compartment 40. This structure significantly improves the uniformity of cold airflow within the carriage 40. The circumferentially spaced air outlets 13 allow cold air to cover the carriage 40 from multiple directions. Combined with the precise airflow guidance provided by the air outlets 14 arranged along the length and the air ducts 20, it effectively avoids the problems of localized overcooling and undercooling found in traditional ductwork. This significantly reduces temperature differences between different areas within the carriage 40, ensuring all goods are kept in a suitable cooling temperature environment. Furthermore, the buffering effect of the air collection chamber 11 reduces air pressure fluctuations during cold air delivery. Under the influence of the air ducts 20, cold air is delivered to each air outlet 14 with stable airflow, speed, and direction, further improving the cooling uniformity within the carriage 40 and enhancing the cooling effect.

[0027] The air outlet 14 is designed as a circular hole, and the size and spacing of the circular holes are adjusted according to the air volume of the fan in the refrigeration unit to meet the needs of the goods. When rapid cooling is required, the diameter of the circular holes is increased and the spacing between the circular holes is shortened.

[0028] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5As a specific embodiment of the cold air exhaust channel provided by this utility model, the channel body 10 includes a long strip bent plate 15 and an end plate 16. The long strip bent plate 15 has multiple mounting planes 17 arranged sequentially along the circumference. Multiple air outlet groups 13 correspond one-to-one with multiple mounting planes 17, and air outlets 14 are respectively opened on the mounting planes 17. The upper two sides of the long strip bent plate 15 are used for fixed installation on the top of the carriage 40. One end of the long strip bent plate 15 is an air inlet 12, which is fixedly installed at the front of the carriage 40. The end plate 16 is fixedly installed at the other end of the long strip bent plate 15 and is used to close the air collection chamber 11. The main body 10 of the passageway consists of a long, bent plate 15 and an end plate 16. The long, bent plate 15 forms multiple circumferentially arranged mounting planes 17 by means of its bent portion. The air outlet group 13 corresponds one-to-one with the mounting planes 17, and the air outlets 14 are opened on the mounting planes 17. At the same time, the upper two sides of the long, bent plate 15 are fixed to the top of the carriage 40, one end forms an air inlet 12 and is fixed to the front of the carriage 40, and the other end is closed by the end plate 16 to form an air collection cavity 11. In this way, by means of multiple circumferentially arranged mounting planes 17, the air outlet group 13 can cover different areas of the carriage 40, avoiding the uneven distribution of cold air caused by traditional unidirectional air outlets, and improving the uniformity of temperature regulation inside the carriage 40; and under the action of multiple mounting planes 17, the orientation of multiple air outlets 14 is accurate, and the air outlets are uniform and stable. The upper two sides of the long strip bent plate 15 are fixed to fit the top structure of the carriage 40. The air inlet 12 is fixed at the front to facilitate connection with the cold air source, saving installation space and making it less prone to loosening. At the same time, the end plate 16 closes the other end of the long strip bent plate 15 to form a sealed air collection cavity 11, reducing the leakage of cold air in the channel and ensuring that the cold air is concentrated and discharged from the air outlet 14, thereby improving the cooling effect.

[0029] Please see Figures 1 to 3 , Figure 6 As a specific embodiment of the cold air exhaust channel provided by this utility model, long strip connecting plates 18 are provided on both sides of the upper end of the long strip bent plate 15 and the upper end of the end plate 16. One end of the long strip bent plate 15 is provided with a bent connecting plate 19 arranged in a conformal manner and surrounding the air inlet 12. The long strip connecting plate 18 provides a flat and regular contact carrier for the connection between the long strip bent plate 15, the end plate 16 and the top of the carriage 40, increasing the contact area and facilitating stable fixing by bolts and other components, avoiding the installation misalignment that is easy to occur with traditional direct connection. From the perspective of sealing the air inlet 12, the conformal bent connecting plate 19 fits the shape of the end of the long strip bent plate 15 and forms a closed connecting area around the air inlet 12, which can be precisely matched with the cold air source interface at the front of the carriage 40, reducing the leakage of cold air at the air inlet end and ensuring the efficiency of cold air delivery. At the same time, the connecting plate structure can enhance the structural rigidity of the long strip bent plate 15 and the end plate 16, disperse the force on the channel body 10, and prevent deformation after long-term use. The long strip connecting plate 18, which is installed on the long strip bending plate 15, is integrally formed with the long strip bending plate 15.

[0030] Please see Figures 1 to 8 As a specific embodiment of the cold air exhaust channel provided by this utility model, both the elongated connecting plate 18 and the bent connecting plate 19 are provided with mounting holes 31 and fasteners 30 for fixed connection. During installation, multiple fixing holes are pre-drilled at the top of the carriage 40 and the cold air source interface at the front of the carriage 40. The elongated bent plate 15 is installed on the carriage 40 and the cold air source interface by connecting the elongated connecting plate 18 and the bent connecting plate 19 respectively. After the mounting holes 31 and the fixing holes are coaxially aligned, the fasteners 30 are used to pass through the mounting holes 31 and the fixing holes to fix and connect to the carriage 40 and the cold air source interface. The elongated connecting plate 18 and the bent connecting plate 19 not only serve as connecting carriers, but also have precise and fixable assembly functions. Preferably, the fixing holes are screw holes, and the fasteners 30 are bolts; and the number of mounting holes 31 on the elongated connecting plate 18 and the bent connecting plate 19 are multiple, and they are evenly spaced along the length direction of the elongated connecting plate 18 and the bent connecting plate 19. Mounting hole 31 is an oblong hole to ensure a more secure and accurate installation.

[0031] As a specific embodiment of the cold air exhaust channel provided by this utility model, both the long strip connecting plate 18 and the bent connecting plate 19 are provided with sealing gaskets; the sealing gaskets are used to fill the gaps between the long strip connecting plate 18, the bent connecting plate 19 and the top of the carriage 40, and the cold air source interface, forming a sealing barrier; the sealing gaskets can compensate for the processing errors and assembly gaps of the connecting surfaces, prevent cold air from leaking from the connection seam between the long strip connecting plate 18 and the top of the carriage 40, and the connection point between the bent connecting plate 19 and the cold air source interface, reduce cold loss, and improve the cooling efficiency of the carriage 40.

[0032] Please see Figures 1 to 6 As a specific embodiment of the cold air exhaust channel provided by this utility model, the multiple air outlets 14 in two adjacent air outlet groups 13 are arranged in a one-to-one alignment or staggered arrangement; that is, the arrangement of the air outlets 14 in adjacent air outlet groups 13 can adopt two methods: "one-to-one alignment" or "staggered arrangement". With the one-to-one alignment arrangement, the airflow direction of adjacent air outlet groups 13 is more unified, which can form a concentrated and stable cold air delivery path and ensure higher uniformity of cold air delivery; with the staggered arrangement, the airflow of adjacent air outlets 14 can complement and cover each other, eliminate air delivery blind spots, and avoid uneven cold air and temperature in the carriage 40.

[0033] Please see Figures 1 to 4As a specific embodiment of the cold air exhaust channel provided by this utility model, the exhaust pipe 20 is a straight pipe; it adopts a linear channel shape without bends, which simplifies the structural complexity of the exhaust pipe 20 and forms a functional layout for straight air guidance. The straight pipe structure has no bending resistance, which can reduce the pressure loss and airflow turbulence of the cold air during the flow process, ensuring that the cold air is delivered from the air inlet to the air collection chamber 11 through a smoother path, reducing cold loss and improving the cooling effect.

[0034] Please see Figure 1 and Figure 7 As a specific embodiment of the cold air exhaust channel provided by this utility model, the lower end of the channel body 10 is provided with an airflow outlet 32 ​​for forming an air curtain, and the airflow outlet 32 ​​is located on the side of the channel body 10 near the rear of the carriage 40, allowing cold air to be discharged from the airflow outlet 32 ​​to form a barrier airflow. This causes the cold air discharged from the airflow outlet 32 ​​near the rear of the carriage 40 to form a vertical air curtain at the rear of the carriage 40, effectively blocking the intrusion of outside hot air from the carriage 40 doors (especially the normally open rear door), while reducing the outward loss of cold air inside the carriage 40, reducing cooling loss, and maintaining a stable internal temperature of the carriage 40. The air curtain maintains temperature by actively blocking rather than simply enhancing cooling.

[0035] Please see Figure 8 This utility model embodiment also provides a refrigerated truck, which includes any of the above-mentioned cold air exhaust channels.

[0036] The refrigerated truck provided by this utility model adopts the aforementioned cold air exhaust channel, thus significantly improving the uniformity of cold air flow inside the compartment 40. Through the circumferentially spaced air outlet group 13, cold air can cover the compartment 40 from multiple directions. Combined with the precise air guiding effect of the air outlet 14 arranged along the length direction and the air duct 20, the problem of local overcooling and local undercooling of traditional pipelines is effectively avoided, greatly reducing the temperature difference between different areas inside the compartment 40 and ensuring that all goods are in a suitable refrigeration temperature environment. Furthermore, the buffering effect of the air collection chamber 11 reduces the air pressure fluctuation during the cold air delivery process, and under the action of the air duct 20, the cold air can be delivered to each air outlet 14 with a stable air volume, air speed, and air direction, further improving the cooling uniformity inside the compartment 40 and improving the cooling effect.

[0037] Please see Figure 8As a specific embodiment of the refrigerated truck provided by this utility model, there are multiple cold air exhaust channels arranged in parallel and at intervals. This method of parallel air delivery through multiple independent cold air exhaust channels within the truck compartment 40 allows cold air to be simultaneously delivered to different areas of the truck compartment 40, overcoming the limitations of single-channel air delivery. The parallel and spaced distribution of multiple cold air exhaust channels can quickly and evenly diffuse cold air throughout the entire truck compartment 40, avoiding localized high temperatures caused by the limited coverage of a single channel. Simultaneous air delivery from multiple cold air exhaust channels increases the total cold air output and shortens the cooling time of the truck compartment 40. Furthermore, the multi-channel design provides redundancy; even if a single channel experiences a minor malfunction, the remaining cold air exhaust channels can still operate normally, ensuring the continuity of the refrigeration function and further improving the reliability and practicality of the refrigerated truck.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold air exhaust duct, characterized in that, include: The passage body is a long strip structure, used for fixed installation on the top of the carriage and arranged along the length of the carriage; the passage body has an air collecting chamber arranged along the length, and one end has an air inlet connected to the air collecting chamber; the passage body has multiple air outlet groups arranged circumferentially and connected to the air collecting chamber, and the multiple air outlets in the air outlet groups are arranged along the length of the passage body. There are multiple air ducts, each corresponding to one of the multiple air outlets; the air ducts are located inside the air collection chamber and are fixedly connected to the channel body; the lower end of the air duct is connected to the air outlet, and the air ducts and the air outlets are arranged coaxially.

2. The cold air exhaust duct as described in claim 1, characterized in that, The channel body includes a long, bent plate and an end plate. The long, bent plate has multiple mounting planes arranged sequentially along the circumference. Multiple air outlet groups correspond one-to-one with multiple mounting planes, and the air outlets are respectively opened on the mounting planes. The upper two sides of the long, bent plate are used for fixed installation on the top of the carriage. One end of the long, bent plate is the air inlet and is fixedly installed at the front of the carriage. The end plate is fixedly installed at the other end of the long, bent plate and is used to close the air collection chamber.

3. The cold air exhaust duct as described in claim 2, characterized in that, The upper sides of the long strip bent plate and the upper end of the end plate are provided with long strip connecting plates, and one end of the long strip bent plate is provided with a bent connecting plate arranged in a conformal shape and surrounding the air inlet.

4. The cold air exhaust channel as described in claim 3, characterized in that, Both the elongated butt joint plate and the bent butt joint plate are provided with mounting holes and fasteners for fixed connection.

5. The cold air exhaust duct as described in claim 3, characterized in that, Both the elongated butt joint plate and the bent butt joint plate are equipped with sealing gaskets.

6. The cold air exhaust duct as described in claim 1, characterized in that, The multiple air outlets in two adjacent air outlet groups are arranged either aligned or staggered.

7. The cold air exhaust duct as described in claim 1, characterized in that, The exhaust duct is a straight pipe.

8. The cold air exhaust duct as described in claim 1, characterized in that, The lower end of the passage body is provided with an airflow outlet for forming an air curtain, and the airflow outlet is located on the side of the passage body near the rear of the carriage.

9. A refrigerated truck, characterized in that, Includes the cold air exhaust channel as described in any one of claims 1-8.

10. The refrigerated truck as described in claim 9, characterized in that, The number of cold air exhaust channels is multiple, and they are arranged in parallel at intervals.

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