Cold air circulation structure in refrigerator car box and working method of cold air circulation structure

Abstract

The cold air circulation structure in the refrigerator car box body comprises the refrigerator car box body and a refrigerating unit arranged on the refrigerator car box body, a cold air flow guide unit is arranged on the refrigerator car box body, and the cold air flow guide unit can evenly blow cold air to all areas in the front, back, left and right directions of the box body from top to bottom; according to the low-temperature storage box, it can be guaranteed that cold air flows smoothly under the condition that the box body is filled with goods, the situation that the goods on the rear portion in the box body cannot reach the needed low-temperature storage environment later, and consequently the box body is rotten and deteriorated can be avoided, and serious economic losses caused by freight practitioners and transportation demanders are reduced.

Description

Technical Field

[0001] This invention belongs to the field of air-cooled refrigeration in large refrigerated trucks. Specifically, this invention relates to a cold air circulation structure inside a refrigerated truck and its working method. Background Technology

[0002] Most existing refrigerated truck refrigeration units are front-mounted and split-type, with the evaporator typically located directly inside the upper part of the front panel of the truck body, and the condenser located on the upper outer part of the front panel. This design is suitable for small refrigerated trucks with smaller cargo volumes and shorter lengths. However, in large refrigerated trucks with longer cargo volumes, this can lead to prolonged uneven temperatures within the truck body. Cold air from the rear of the truck, which is slowly transferred from the front, cools down more slowly. This is especially problematic when cargo is piled up, blocking the evaporator's vents. In such extreme cases, cold air from the front of the truck struggles to penetrate the gaps in the cargo to reach the rear. Cargo at the rear then takes a very long time to reach, or may not even reach, the required low-temperature storage environment. This results in spoilage and damage to cargo in the rear, causing significant economic losses for both freight operators and transport customers. Summary of the Invention

[0003] This invention addresses the aforementioned problems and aims to provide a refrigerated truck body cold air circulation structure that can evenly distribute cold air from top to bottom to all areas in the front, back, left, and right directions of the cargo box, ensuring smooth cold air flow even when the cargo box is full of goods. This structure prevents spoilage and deterioration of goods inside the cargo box due to the rear not reaching the required low-temperature storage environment. To achieve the above objective, the technical solution adopted by this invention is as follows: The present invention provides a cold air circulation structure inside a refrigerated truck body, characterized by including a refrigerated truck body and a refrigeration unit installed on the refrigerated truck body, wherein a cold air guiding unit is provided on the refrigerated truck body.

[0004] The refrigerated truck body cold air circulation structure provided by the present invention may also have the following features: the refrigerated truck body includes a front panel, a bottom panel, a top panel, and side panels. One side of the side panel is connected to the bottom panel, and the other side of the side panel is connected to the top panel. The front panel is connected to the bottom panel, the top panel, and the side panels.

[0005] The refrigerated truck body cold air circulation structure provided by the present invention may also have the following features: the side panels of the body are respectively connected to the left rear door panel and the right rear door panel, one side of the left rear door panel is movably connected to the side panel of the body, and one side of the right rear door panel is movably connected to the side panel of the body.

[0006] The cold air circulation structure inside the refrigerated truck body provided by the present invention may also have the following features: the cold air guiding unit includes a main flow plate at the top of the body and a rear sealing plate. The left and right sides of the main flow plate at the top of the body are respectively connected to the side panels of the body. The front side of the main flow plate at the top of the body is connected to the front panel of the body. One side of the rear sealing plate is connected to the rear side of the main flow plate at the top of the body, and the other side of the rear sealing plate is connected to the top panel of the body.

[0007] The refrigerated truck body cold air circulation structure provided by the present invention may also have the following features: the top of the body has a main flow plate with a mounting clearance groove on the side near the front panel of the body. The mounting clearance groove has a mounting plate, a first side patch plate and a second side patch plate. The first side patch plate is respectively set on the left and right sides of the mounting plate. The side of the first side patch plate away from the mounting plate is connected to the top panel of the body. One side of the second side patch plate is connected to the mounting plate, and the other side of the second side patch plate is connected to the top panel of the body.

[0008] The refrigerated truck body cooling air circulation structure provided by the present invention may also have the following features: the refrigeration unit includes a refrigeration unit condenser and a refrigeration unit evaporator connected to the refrigeration unit condenser. The refrigeration unit condenser is installed on the front panel of the body, and the refrigeration unit evaporator is installed on the mounting plate and located in the mounting clearance groove of the main flow plate at the top of the body.

[0009] The refrigerated truck body cooling air circulation structure provided by the present invention may also have the following feature: the cooling air guiding unit further includes a diffuser disposed on the main flow plate at the top of the body, and the diffuser is evenly disposed on the main flow plate at the top of the body.

[0010] The refrigerated truck body cold air circulation structure provided by the present invention may also have the following features: the cold air guiding unit further includes a front plate bending guiding groove provided on the front panel of the body; the cold air guiding unit further includes a bottom plate bending guiding groove provided on the bottom plate of the body; the cold air guiding unit further includes a top plate bending guiding groove provided on the top plate of the body; the cold air guiding unit further includes a side plate bending guiding groove provided on the side plate of the body; the cold air guiding unit further includes door panel bending guiding grooves provided on the left rear door panel and the right rear door panel.

[0011] The cold air circulation structure inside the refrigerated truck body provided by the present invention may also have the following features: the cold air is first blown out from top to bottom through diffusers that are evenly distributed on the main flow plate at the top of the body, and then flows downward through the guide grooves on the front panel, left and right side panels, and rear left and right door panels of the body and the gaps between the cargo stacking. When the cold air flows to the bottom of the body, it flows to various areas of the bottom plate of the body through the bottom plate bending guide grooves on the bottom plate of the body.

[0012] This invention also provides a working method based on the above-mentioned cold air circulation structure inside the refrigerated truck body, characterized by the following steps: Step S1, the refrigeration unit starts, the evaporator of the refrigeration unit generates cold air, and the cold air enters the guide channel formed by the main flow plate at the top of the body; Step S2, the cold air is blown out from top to bottom through diffusers evenly arranged on the main flow plate at the top of the body, forming a main cold air flow from top to bottom; Step S3, the cold air flow from top to bottom flows downward along the side wall of the body and the gap between the goods under the guidance of the bending guide grooves of the front panel, the side panel, and the door panel; Step S4, the cold air flowing to the bottom of the body is evenly diffused to various areas of the bottom plate of the body under the guidance of the bending guide grooves of the bottom plate, realizing a uniform distribution of cold air at the bottom of the body; Step S5, the heated gas after absorbing heat flows back upward and re-enters the evaporator of the refrigeration unit for cooling circulation, forming a continuous and uniform cold air circulation inside the body. The technical effects of this invention are as follows: The cold air circulation structure inside the refrigerated truck body provided by this invention includes a refrigerated truck body and a refrigeration unit installed on the refrigerated truck body. The refrigerated truck body is equipped with a cold air guiding unit, which can evenly blow cold air from top to bottom to various areas in the front, back, left and right directions of the body. It can ensure smooth flow of cold air even when the body is full of goods, and can prevent spoilage and deterioration caused by the rear goods not reaching the required low temperature storage environment in time. This reduces serious economic losses to freight operators and both parties in transportation. Attached Figure Description

[0013] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the airflow direction of the left and right side plates in an embodiment of the present invention; Figure 5 This is a schematic diagram of the airflow direction of the front panel and rear door panel in an embodiment of the present invention.

[0014] The following are labeled in the diagram: Refrigerated truck body - 10, front panel - 11, bottom panel - 12, top panel - 13, side panel - 14, left rear door panel - 15, right rear door panel - 16, refrigeration unit - 20, refrigeration unit condenser - 21, refrigeration unit evaporator - 22, cold air guiding unit - 30, top main airflow plate - 31, mounting clearance groove - 311, mounting plate - 312, first side reinforcement plate - 313, second side reinforcement plate - 314, rear sealing plate - 32, diffuser - 33, front panel bending guide groove - 34, bottom panel bending guide groove - 35, top panel bending guide groove - 36, side panel bending guide groove - 37, door panel bending guide groove - 38. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0016] Figure 1 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the cold air circulation structure inside the refrigerated truck body in an embodiment of the present invention. Figure 3 .

[0017] like Figure 1 , Figure 2 as well as Figure 3 As shown, the cold air circulation structure inside the refrigerated truck body provided by the present invention includes a refrigerated truck body 10 and a refrigeration unit 20 installed on the refrigerated truck body 10. The refrigerated truck body 10 is provided with a cold air guiding unit 30, which can blow cold air evenly from top to bottom to various areas in the front, back, left and right directions of the refrigerated truck body 10. It can ensure smooth flow of cold air when the refrigerated truck body 10 is full of goods, and can avoid spoilage and deterioration caused by the rear goods not reaching the required low temperature storage environment in the refrigerated truck body 10. It reduces serious economic losses to freight operators and both parties in transportation needs, and fundamentally solves a series of technical problems of traditional refrigerated truck bodies when fully loaded with goods, such as poor cold air circulation, high temperature at the rear of the body, localized temperature rise of goods, easy spoilage and deterioration, poor temperature uniformity, high energy consumption, and low refrigeration efficiency.

[0018] like Figure 1 , Figure 2 as well as Figure 3As shown, the refrigerated truck body 10 includes a front panel 11, a bottom panel 12, a top panel 13, and side panels 14. One side of the side panel 14 is connected to the bottom panel 12, and the other side of the side panel 14 is connected to the top panel 13. The two side panels 14 are arranged parallel to each other and are located on the left and right sides of the bottom panel 12. The front panel 11 is connected to the bottom panel 12, the top panel 13, and the side panels 14. The front panel 11 is located in front of the bottom panel 12 and on the side of the bottom panel 12 closest to the driver's cab, making the refrigerated truck body 10 rectangular.

[0019] The front panel 11 of the refrigerated truck body is located at the end of the refrigerated truck body closest to the cab. It serves as the installation carrier for the refrigeration unit and also participates in the cold air flow and sealing of the body. The front panel 11 is made of heat insulation board and filled with a high-density polyurethane insulation layer. The outer panel and the inner panel are made of fiberglass or color-coated steel plate composite molding, which has the characteristics of high strength, good heat insulation performance, corrosion resistance and easy cleaning.

[0020] The bottom plate 12 of the container is a horizontal load-bearing structure used to support the weight of the goods. The bottom plate has a reinforced frame inside to ensure load-bearing strength, and the surface is equipped with anti-slip texture and drainage structure for easy cleaning and water removal. The bottom plate 12 of the container also adopts a heat preservation structure to prevent cold air from escaping from the bottom.

[0021] The top panel 13 is located at the top of the cabinet and is connected to the front panel 11 and the side panel 14 to form a closed top structure. The top panel 13 not only plays a role in sealing and heat preservation, but also works with the cold air guiding unit to form a closed top guiding space, so that the cold air can only flow along the preset path and avoid the loss of cold energy.

[0022] The side panels 14 of the enclosure include a left side panel and a right side panel, which are symmetrically arranged on the left and right sides of the bottom plate 12 of the enclosure. They are vertically arranged and parallel to each other. The side panels 14 are sealed to the front panel 11, the top panel 13, and the bottom plate 12 of the enclosure to form the left and right side enclosure structure of the enclosure. The side panels are also made of thermal insulation composite board to ensure the overall thermal insulation performance and structural strength.

[0023] The left rear door panel 15 and the right rear door panel 16 are respectively installed at the rear ends of the left and right side panels 14 of the container via hinges. The door panels can be flipped outwards to open and load / unload goods. When the left rear door panel 15 and the right rear door panel 16 are closed, they form a sealed closed structure with the side panels 14, the top panel 13, and the bottom panel 12 of the container to prevent cold air from escaping. The interior of the door panels is also equipped with an insulation layer to ensure the insulation effect of the rear door area.

[0024] Through the above structure, the refrigerated truck body 10 forms a low-temperature body structure that is closed at the front end, openable at the rear end, insulated on all sides, and has strong overall rigidity, providing a stable and reliable installation foundation and working environment for the cold air circulation structure.

[0025] Two side panels 14 of the refrigerated truck body are respectively connected to a left rear door panel 15 and a right rear door panel 16. One side of the left rear door panel 15 is hinged to the side panel 14, allowing it to be flipped open. Similarly, one side of the right rear door panel 16 is hinged to the side panel 14, enabling easy loading and unloading of goods inside the refrigerated truck body 10. When the left and right rear door panels 15 and 16 are closed, they form a sealed structure with the side panels 14, the top panel 13, and the bottom panel 12, preventing cold air leakage. An insulation layer is also installed inside the door panels to ensure proper insulation of the rear door area.

[0026] like Figure 1 , Figure 2 as well as Figure 3 As shown, the cold air guiding unit 30 is used to collect, guide, divide, distribute, and recirculate cold air to achieve uniform circulation throughout the entire area. The cold air guiding unit 30 includes a main flow plate 31 at the top of the housing and a rear sealing plate 32. The left and right sides of the main flow plate 31 at the top of the housing are connected to the side panels 14 of the housing, and the front side of the main flow plate 31 at the top of the housing is connected to the front panel 11 of the housing. The main flow plate 31 at the top of the housing is located below the top panel 13 of the housing. One side of the rear sealing plate 32 is connected to the rear side of the main flow plate 31 at the top of the housing. The other side is connected to the top plate 13 of the cabinet, so that a closed space is formed between the main diffuser plate 31 and the top plate 13 of the cabinet. This closed space provides a stable transmission space for the cold air, so that the cold air is delivered from the front evaporator position to the rear and evenly distributed to the entire length of the top of the cabinet. At the same time, the rear sealing plate 32 is set vertically, with its upper end connected to the top plate 13 of the cabinet and its lower end connected to the main diffuser plate 31 of the top of the cabinet, so as to seal the rear end of the guide channel, prevent the cold air from overflowing directly from the rear, and ensure that the cold air can only be sent out downward from the diffuser.

[0027] The top of the housing has a main flow plate 31 with a mounting clearance groove 311 on the side near the front panel 11. The mounting clearance groove 311 provides space for the installation of the refrigeration unit 20. The mounting clearance groove 311 contains a mounting plate 312, a first side reinforcement plate 313, and a second side reinforcement plate 314. The two first side reinforcement plates 313 are respectively located on the left and right sides of the mounting plate 312. The side of the first side reinforcement plate 313 away from the mounting plate 312 is connected to the top panel 13 of the housing to seal the lateral gap. One side of the second side plate 314 is connected to the mounting plate 312, and the other side of the second side plate 314 is connected to the top plate 13 of the housing. The connection achieves the sealing of the mounting clearance groove 311. Through the setting of the mounting plate 312, the first side plate 313 and the second side plate 314, the top guide channel forms a channel structure that is closed in front, back, left, right and top. Only the diffuser is opened on the main flow plate 31 at the top of the housing as a downward air outlet to achieve directional delivery and uniform distribution of cold air.

[0028] The refrigeration unit 20 includes a refrigeration unit condenser 21 and a refrigeration unit evaporator 22 connected to the refrigeration unit condenser 21. The refrigeration unit condenser 21 is mounted on the front panel 11 of the housing, and the refrigeration unit evaporator 22 is mounted on the mounting plate 312 and located in the mounting clearance groove 311 of the main flow plate 31 at the top of the housing.

[0029] The condenser 21 of the refrigeration unit is installed on the outside of the front panel 11 of the housing to dissipate heat to the external environment. The condenser 21 is equipped with components such as a fan, condenser coil, and compressor to complete the condensation and heat release process in the refrigeration cycle. The evaporator 22 of the refrigeration unit is installed inside the front panel 11 of the housing, located within the cold air guiding unit, to directly supply cold air into the housing. The evaporator 22 includes structures such as an evaporator coil, fan, and guide shroud. During operation, the low-temperature refrigerant flows within the evaporator coil, absorbing heat from the air and lowering the air temperature to form low-temperature cold air, which is then sent into the guiding channel by the fan. The air outlet of the evaporator 22 faces the closed guiding channel formed between the top panel 13 of the housing and the main flow plate 31 on the top of the housing, ensuring that all cold air preferentially enters the guiding channel and is then evenly distributed to the entire housing area through a preset path, avoiding direct concentrated spraying of cold air towards the front area.

[0030] The airflow guiding unit 30 also includes a diffuser 33 disposed on the main flow plate 31 at the top of the box. The diffuser 33 is evenly disposed on the main flow plate 31 at the top of the box. The diffuser 33 is evenly arranged in a matrix along the front-back direction and left-right direction of the refrigerated truck box 10. The diffuser 33 has a circular, square or strip-shaped opening structure. The opening is equipped with guide vanes to make the airflow blow out vertically downward or slightly forward or backward, ensuring that the cold air can cover the entire area below the top of the box.

[0031] The number, aperture, and arrangement density of the diffusers 33 are optimized based on parameters such as the length, width, cooling capacity, and set temperature of the refrigerated truck body. In long truck bodies, the density of the diffusers at the rear can be appropriately increased to ensure sufficient airflow at the rear and avoid insufficient air volume at the rear. The function of the diffusers 33 is to decompose the concentrated airflow in the top guide channel into multiple uniform small airflows, allowing the cold air to be vertically delivered into the interior of the truck body from top to bottom, forming a uniform air curtain covering the entire width and length. This avoids problems such as excessively low local temperatures, airflow impacting goods, and goods drying out due to single-point large airflow. When goods are stacked high, the air curtain can flow downwards along the surface of the goods and enter the gaps between them. Through the uniform airflow from the diffusers, the cold air circulation structure inside the refrigerated truck body provided by this invention achieves full-area air supply from the top, solving the problem of uneven airflow distribution caused by traditional single-point air supply from the source.

[0032] The cold air guiding unit 30 also includes a front plate bending guide groove 34 disposed on the front plate of the housing. The front plate bending guide groove 34 is disposed on the inner side of the front plate 11 of the housing, and is arranged vertically or obliquely. It is used to guide the cold air flowing down from the top to flow downward along the front plate, while guiding the bottom return air upward into the evaporator. The front plate bending guide groove 34 can reduce the resistance of airflow along the wall, increase the airflow speed, and enhance the circulation power.

[0033] The airflow guiding unit 30 also includes a bottom plate bending guide groove 35 disposed on the bottom plate of the cabinet. The bottom plate bending guide groove 35 is disposed on the upper surface of the bottom plate 12 of the cabinet and is arranged alternately or parallel in the front-back and left-right directions. When the cold air flows to the bottom, the bottom plate bending guide groove 35 guides and diffuses the airflow, so that the cold air is evenly distributed to various areas of the bottom, avoiding local high temperature at the bottom, and at the same time guiding the airflow at the bottom to flow back upward to form a complete cycle.

[0034] The airflow guiding unit 30 also includes a top plate bending guide groove 36 set on the top plate of the housing. The top plate bending guide groove 36 is set below the top plate 13 of the housing and works in conjunction with the main flow plate 31 on the top of the housing to optimize the airflow state in the top guide channel, reduce eddies and resistance, and make the airflow from front to back smoother.

[0035] The cold air guiding unit 30 also includes a side plate bending guide groove 37 disposed on the side plate of the box. The side plate bending guide groove 37 is disposed on the inner side of the side plate 14 of the box and is arranged in a vertical or inclined direction. When the cold air flows downward from the top diffuser 33, the side plate bending guide groove 37 guides the airflow, so that the cold air flows steadily downward along the side plate 14 of the box. At the same time, when the box is fully loaded with goods, the airflow is guided to pass through the gap between the side plate 14 of the box and the goods, ensuring that there are no high temperature dead corners on the left and right sides of the box.

[0036] The airflow guiding unit 30 also includes door panel bending guide grooves 38 disposed on the left rear door panel 15 and the right rear door panel 16. The door panel bending guide grooves 38 are disposed on the inner side of the left rear door panel 15 and the right rear door panel 16. The rear of a traditional refrigerated truck is the most likely place to form a high temperature zone. The present invention uses door panel bending guide grooves to allow airflow to flow smoothly to the rearmost part of the refrigerated truck body 10 and flow downward along the rear door panel to ensure that the temperature of the rear door area is consistent with that of the front.

[0037] Figure 4 This is a schematic diagram of the airflow direction of the left and right side plates in an embodiment of the present invention; Figure 5 This is a schematic diagram of the airflow direction of the front panel and rear door panel in an embodiment of the present invention.

[0038] like Figure 4 and Figure 4As shown, the cold air circulation path of the present invention is clear, orderly, and closed-loop. The specific flow process is as follows: the refrigeration unit 20 operates, and the evaporator 22 of the refrigeration unit generates stable low-temperature cold air. All the cold air enters the closed guide channel between the top plate 13 of the top housing and the main flow plate 31 on the top of the housing. It diffuses evenly from front to back in the closed guide channel, filling the entire top space. The cold air is blown vertically downward through the evenly distributed diffusers 33, forming a large-area uniform airflow field. The airflow field flows along the bends on the front plate 11, side plate 14, left rear door 15, and right rear door 16 of the housing. The airflow flows downwards, and when goods are present, the airflow simultaneously enters the gaps between the stacked goods, allowing for thorough heat exchange. Upon reaching the bottom of the refrigerated truck body 10, the airflow diffuses outwards under the action of the bent guide channels 35 in the bottom plate, achieving uniform flow throughout the bottom area. After absorbing heat from the goods, the cold air's temperature rises and its density decreases. Driven upwards by buoyancy and fresh air, the heated air rises along the gaps between the walls and the goods, returning to the evaporator 22 of the refrigeration unit at the front of the refrigeration truck body 10. The evaporator 22 then cools the heated air again, forming a continuous closed-loop cycle. This circulation path has the following characteristics: clear airflow direction, no short circuits, no eddies, and no dead zones; good circulation is maintained both fully loaded and empty; large contact area between the cold air and goods, resulting in high heat exchange efficiency; high temperature uniformity, with the temperature difference between the front and rear sections controllable within 1℃; low operating load of the refrigeration unit, resulting in significant energy savings.

[0039] A key advantage of this invention is its ability to maintain efficient airflow even when fully loaded. In traditional refrigerated trucks, cargo occupies most of the space, obstructing airflow and preventing it from reaching the rear. However, in this invention, the diffuser 33 on the main airflow plate 31 at the top of the container provides full-area airflow, covering the upper surface of the cargo with cool air. The front panel bend guide groove 34, side panel bend guide groove 37, and door panel bend guide groove 38 provide wall-mounted airflow channels, allowing cool air to bypass the cargo and reach the rear. The bottom panel bend guide groove 35 ensures cool air flows beneath the cargo, achieving bottom cooling. Rising airflow is not completely obstructed by cargo and can flow smoothly back. Therefore, even when the container is completely filled with cargo, cool air can still circulate throughout, allowing the rear, corners, and bottom of the container to quickly reach the set temperature, preventing spoilage, deterioration, and failure caused by localized high temperatures.

[0040] This invention significantly improves the temperature uniformity of the container by optimizing airflow organization. Under no-load conditions, the temperature difference inside the container is ≤0.5℃; under full-load conditions, the temperature difference inside the container is ≤1℃. The temperature stabilization speed is increased by more than 30% compared with traditional structures. The number of start-stop cycles of the refrigeration unit is reduced, and energy consumption is reduced by 15% to 25%. For goods such as fresh fruits and vegetables, frozen meat, low-temperature dairy products, vaccines, and biological agents, this invention can strictly meet the temperature stability requirements during transportation, reduce the damage rate, and improve transportation safety and economic benefits.

[0041] The present invention also provides a method for operating the above-described refrigerated truck body cold air circulation structure, characterized by the following steps: In step S1, the refrigeration unit 20 is started, and the compressor, refrigeration unit condenser 21 and refrigeration unit evaporator 22 enter the working state. The refrigeration unit evaporator 22 generates stable low-temperature cold air. Under the action of the evaporator fan, the cold air is sent into the closed guide channel formed between the main flow plate 31 on the top of the box and the top plate 13 of the box, and diffuses evenly from front to back along the length of the refrigerated truck box 10.

[0042] In step S2, the cold air in the closed guide channel is blown downward through the diffuser 33 evenly arranged on the main flow plate 31 at the top of the box, forming a uniform main airflow from top to bottom covering the entire width and length of the refrigerated truck box 10.

[0043] In step S3, the cold airflow from top to bottom flows steadily downward along the front wall, left and right side walls, and inner wall of the rear door of the refrigerated truck body 10 under the guidance of the front panel bending guide groove 34, side panel bending guide groove 37, and door panel bending guide groove 38, and at the same time enters the gap between the goods to fully exchange heat with the goods.

[0044] In step S4, the cold air flowing to the bottom of the refrigerated truck body 10 diffuses to various areas of the bottom of the refrigerated truck body 10 under the guidance of the bottom plate bending guide groove 35, achieving uniform cooling of the entire bottom area.

[0045] In step S5, after the cold air absorbs heat from the cargo, its temperature rises. Under the action of buoyancy and the thrust of fresh air, it flows upward and flows back to the front of the refrigerated truck body 10 along the gap between the wall and the cargo. The heated and returning air re-enters the evaporator of the refrigeration unit, is cooled down, and re-enters the guide channel, forming a continuous, stable, efficient, and uniform closed-loop cold air circulation.

[0046] The refrigerated truck body cooling air circulation structure provided by this invention has the following beneficial effects: Uniform airflow throughout the entire area is achieved through a top-sealed guide channel and matrix diffusers, fundamentally solving the problem of uneven airflow from traditional single-point distribution; Even when fully loaded, multiple bend guide channels can be set up to provide wall airflow channels, ensuring smooth airflow even when fully loaded; Temperature dead zones are eliminated with guide structures at the front, rear, left, right, top, and bottom, eliminating high-temperature blind spots at any point in the body; Reduced cargo damage rate and high temperature uniformity prevent cargo from spoiling due to localized high temperatures, significantly reducing economic losses; Energy saving and consumption reduction with high circulation efficiency and low refrigeration load, reducing fuel consumption and unit wear; Simple and reliable structure with no complex moving parts, low cost, low failure rate, long service life, and easy mass production; Does not occupy loading space as the guide structures are all wall-integrated, not reducing effective loading volume; Wide applicability, suitable for refrigerated trucks, frozen trucks, and fresh-keeping trucks of different lengths, widths, and tonnages.

[0047] The cold air circulation structure inside the refrigerated truck body provided by this invention can be directly modified based on the existing refrigerated truck body production. The main diffuser plate 31 and the rear sealing plate 32 on the top of the body are fixed by bolts or welding. The bent guide channel is integrally bent and formed with the body panel, which is simple to process. The diffuser has high opening precision and standardized installation. The evaporator installation position is compatible with the existing refrigeration unit, and the modification difficulty is low. During maintenance, it is only necessary to clean the dust and debris on the surface of the diffuser and guide channel regularly to ensure smooth airflow. No special tools or complicated operations are required.

[0048] In the refrigerated truck body cooling circulation structure provided by this invention, by integrating components such as the top main flow plate, rear sealing plate, diffuser, and multi-position bent flow guide grooves inside the refrigerated truck body, a complete closed airflow circulation system is formed, flowing from top to bottom, from the wall to the cargo, from the top to the bottom, and then back to the cold source. From multiple dimensions such as cooling airflow distribution, flow path organization, temperature field uniformity, cargo protection, energy consumption control, and structural practicality, a comprehensive optimization of the traditional refrigerated truck body cooling mode is achieved, with significant and stable technical effects.

[0049] The core technical effect of this invention lies in achieving uniform airflow throughout the refrigerated truck's interior, fundamentally solving the problem of uneven airflow distribution. Traditional refrigerated trucks often use single-point direct airflow at the front, making it difficult for cold air to diffuse to the rear, bottom, and corner areas of the truck body, easily creating high-temperature blind spots. This invention uses a main airflow deflector at the top of the truck body, combined with the top plate, to form a closed airflow channel. This smoothly delivers the cold air generated by the refrigeration unit from front to back, and then vertically downwards through a matrix of evenly arranged diffusers, forming a uniform air curtain covering the entire width and length of the truck body. This prevents the cold air from concentrating at the front of the truck body, instead distributing it evenly across the entire top area, achieving equalization of the airflow source and significantly improving the overall uniformity of airflow distribution.

[0050] This invention ensures smooth airflow even when fully loaded, significantly improving refrigeration reliability under complex operating conditions. In traditional refrigerated trucks, airflow is easily blocked by cargo when the container is full, resulting in the rear cargo remaining in a high-temperature environment for extended periods. This invention addresses this by incorporating bent guide channels on the front, left and right side panels, rear door panel, and floor panel, providing dedicated wall-mounted flow channels for cold air. Cold air can bypass the cargo stack along these channels, smoothly reaching the rear and bottom of the container. Simultaneously, internal heat exchange is achieved through the gaps between cargo, ensuring stable airflow under different loading conditions—full load, half load, and empty—preventing circulation failure due to cargo obstruction.

[0051] This invention significantly eliminates temperature dead zones within the enclosure, greatly improving temperature uniformity and control accuracy. Through the synergistic effect of uniform airflow from the top, sidewall guidance, and bottom distribution, cold air can cover all areas of the enclosure—front, back, left, right, top, and bottom—avoiding localized overheating or undercooling and drastically reducing temperature differences within the enclosure. The resulting more stable and uniform temperature field effectively meets the storage and transportation requirements of temperature-sensitive goods such as fresh food, frozen products, and pharmaceuticals, reducing quality degradation and spoilage caused by excessive temperature fluctuations, and enhancing the safety and stability of low-temperature transportation.

[0052] This invention offers the technical benefits of enhanced air circulation efficiency and reduced refrigeration unit load and energy consumption. The enclosed flow channel reduces disordered air diffusion and energy loss, while the bent flow channel lowers airflow resistance along the wall, resulting in a smoother circulation path and more efficient heat exchange. After absorbing heat, the cold air can quickly return to the evaporator along the pre-designed channel for further cooling, forming a continuous and efficient closed-loop cycle. This eliminates the need for prolonged high-load operation of the refrigeration unit to maintain the set temperature, effectively reducing unit start-up and shutdown frequency, lowering energy consumption and wear, extending the refrigeration unit's lifespan, and reducing operating costs and failure rates during transportation.

[0053] This invention effectively protects the quality of goods, reduces damage rates, and minimizes economic losses. Due to the uniform temperature and stable airflow within the container, with no localized high-temperature blind spots, goods can remain in a stable and suitable low-temperature environment throughout the entire process. This slows down the aging of fresh fruits and vegetables, prevents frozen goods from softening, and avoids the deterioration of pharmaceutical cold chain products. It significantly reduces the risk of spoilage and deterioration during transportation, directly reducing economic losses for freight companies, cargo owners, and other transportation-related parties, and improving the overall efficiency of cold chain transportation.

[0054] This invention also boasts the advantages of simple structure, convenient implementation, and strong practicality. All flow guiding components are integrated with the box structure, occupying no additional loading space and not affecting cargo loading / unloading or box strength. The structure has no complex moving parts, simplifying processing, installation, and maintenance. It is adaptable to refrigerated truck boxes of different tonnages and sizes, exhibiting strong versatility. The overall structure improves refrigeration performance while balancing manufacturing costs and reliability, possessing significant market potential.

[0055] In summary, this invention, through systematic airflow organization and structural design, achieves uniform distribution, efficient circulation, and full coverage of cold air within the refrigerated truck body. It has achieved outstanding technical results in terms of temperature uniformity, operating condition adaptability, energy saving, cargo protection, and practicality. It effectively solves the long-standing technical problems of traditional refrigerated trucks, such as poor airflow, excessive temperature difference, high cargo damage, and high energy consumption, and is of great significance for improving the level of cold chain transportation equipment.

[0056] The cold air circulation structure inside the refrigerated truck body provided by this invention includes a refrigerated truck body 10 and a refrigeration unit 20 installed on the refrigerated truck body 10. The refrigerated truck body 10 is provided with a cold air guiding unit 30, which can blow cold air evenly from top to bottom to various areas in the front, back, left and right directions of the refrigerated truck body 10. It can ensure smooth flow of cold air when the refrigerated truck body 10 is full of goods, and can avoid spoilage and deterioration caused by the rear of the goods not reaching the required low temperature storage environment in time. It reduces serious economic losses to freight operators and both parties in transportation needs, and fundamentally solves a series of technical problems of traditional refrigerated truck bodies when fully loaded with goods, such as poor cold air circulation, high temperature at the rear of the body, localized temperature rise of goods, easy spoilage and deterioration, poor temperature uniformity, high energy consumption, and low refrigeration efficiency.

[0057] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A cold air circulation structure inside a refrigerated truck body, characterized in that, It includes a refrigerated truck body (10) and a refrigeration unit (20) installed on the refrigerated truck body (10), and the refrigerated truck body (10) is provided with a cold air guiding unit (30).

2. The cold air circulation structure inside the refrigerated truck body according to claim 1, characterized in that, The refrigerated truck body (10) includes a front panel (11), a bottom panel (12), a top panel (13), and a side panel (14). One side of the side panel (14) is connected to the bottom panel (12), and the other side of the side panel (14) is connected to the top panel (13). The front panel (11) is connected to the bottom panel (12), the top panel (13), and the side panel (14).

3. The cold air circulation structure inside the refrigerated truck body according to claim 2, characterized in that, The side panel (14) of the box is connected to the left rear door panel (15) and the right rear door panel (16) respectively. One side of the left rear door panel (15) is movably connected to the side panel (14) of the box, and one side of the right rear door panel (16) is movably connected to the side panel (14) of the box.

4. The cold air circulation structure inside the refrigerated truck body according to claim 3, characterized in that, The airflow guiding unit (30) includes a main airflow plate (31) on the top of the housing and a rear sealing plate (32). The left and right sides of the main airflow plate (31) on the top of the housing are connected to the side plates (14) of the housing, the front side of the main airflow plate (31) on the top of the housing is connected to the front plate (11) of the housing, one side of the rear sealing plate (32) is connected to the rear side of the main airflow plate (31) on the top of the housing, and the other side of the rear sealing plate (32) is connected to the top plate (13) of the housing.

5. The cold air circulation structure inside the refrigerated truck body according to claim 4, characterized in that, The top of the housing has a main flow plate (31) with a mounting clearance groove (311) on the side near the front panel (11) of the housing. The mounting clearance groove (311) is provided with a mounting plate (312), a first side plate (313) and a second side plate (314). The first side plate (313) is respectively located on the left and right sides of the mounting plate (312). The side of the first side plate (313) away from the mounting plate (312) is connected to the top panel (13) of the housing. One side of the second side plate (314) is connected to the mounting plate (312), and the other side of the second side plate (314) is connected to the top panel (13) of the housing.

6. The cold air circulation structure inside the refrigerated truck body according to claim 5, characterized in that, The refrigeration unit (20) includes a refrigeration unit condenser (21) and a refrigeration unit evaporator (22) connected to the refrigeration unit condenser (21). The refrigeration unit condenser (21) is disposed on the front panel (11) of the housing, and the refrigeration unit evaporator (22) is disposed on the mounting plate (312) and located in the mounting clearance groove (311) of the main flow plate (31) at the top of the housing.

7. The cold air circulation structure inside the refrigerated truck body according to claim 6, characterized in that, The airflow guiding unit (30) also includes a diffuser (32) disposed on the main airflow plate (31) at the top of the housing, and the diffuser (32) is evenly disposed on the main airflow plate (31) at the top of the housing.

8. The cold air circulation structure inside the refrigerated truck body according to claim 7, characterized in that, The airflow guiding unit (30) further includes a front plate bending guide groove (34) provided on the front plate (11) of the housing; the airflow guiding unit (30) further includes a bottom plate bending guide groove (35) provided on the bottom plate (12) of the housing; the airflow guiding unit (30) further includes a top plate bending guide groove (36) provided on the top plate (13) of the housing; the airflow guiding unit (30) further includes a side plate bending guide groove (37) provided on the side plate (14) of the housing; the airflow guiding unit (30) further includes a door plate bending guide groove (38) provided on the left rear door plate (15) and the right rear door plate (16).

9. The cold air circulation structure inside the refrigerated truck body according to claim 8, characterized in that, The cold air is first blown out from top to bottom through the diffusers (32) evenly distributed on the main flow plate (31) at the top of the box. Then it flows downward through the guide grooves on the front panel, left and right side panels, and rear left and right door panels of the box and the gaps between the goods. When the cold air flows to the bottom of the box, it flows to various areas of the bottom plate of the box through the bottom plate bending guide groove (35) on the bottom plate (12).

10. A method for operating the cold air circulation structure inside a refrigerated truck body according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: The refrigeration unit (20) is started, and the evaporator (22) of the refrigeration unit generates cold air. The cold air enters the guide channel formed by the main flow plate (31) at the top of the box. Step S2: The cold air is blown out from top to bottom through the diffusers (32) evenly arranged on the main flow plate (31) at the top of the box, forming a main cold air flow from top to bottom. Step S3: The cold air flow from top to bottom flows downward along the side wall of the box and the gap between the goods under the guidance of the front panel bending guide groove (34), the side panel bending guide groove (37), and the door panel bending guide groove (38). Step S4: The cold air flowing to the bottom of the box is evenly diffused to various areas of the bottom plate (12) of the box under the guidance of the bottom plate bending guide groove (35), realizing the uniform distribution of cold air at the bottom of the box. Step S5: The heated gas after absorbing heat flows back upward and re-enters the evaporator of the refrigeration unit for cooling circulation, forming a continuous and uniform cold air circulation inside the box.

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