Multi-mode fruit and vegetable pre-cooling device and pre-cooling method

Abstract

The invention relates to a multi-mode fruit and vegetable pre-cooling device and a pre-cooling method. The multi-mode fruit and vegetable pre-cooling device comprises a pre-cooling cabinet, a partition plate mechanism installed in the pre-cooling cabinet, a telescopic flow guide structure installed on the partition plate mechanism according to needs and an atomization pipe. The partition plate mechanism can divide the interior of the pre-cooling cabinet according to needs, meanwhile, the telescopic structure is unfolded, invalid space is actively eliminated, and energy losses are reduced. Under the action of the telescopic flow guide structure, a flow guide sky curtain containing a flow guide channel is formed during unfolding, airflow is guided to enter the flow guide channel, so that water vapor generated by evaporation in fruits and vegetables can be pumped away with the shortest path and the highest efficiency in the pre-cooling process, and the surfaces of the fruits and the vegetables are always kept at lower steam partial pressure; the evaporation cooling process is continuously carried out at a high speed; local independent spray can be generated at the bottom of each goods shelf layer according to the types of fruits and vegetables under the action of the atomizing pipes, an evaporation source can be directly provided on the surfaces of the fruits, internal migration resistance is bypassed, and the overall pre-cooling time is shortened.

Description

Technical Field

[0001] This invention relates to the field of post-harvest processing technology for agricultural products, specifically to a multi-mode fruit and vegetable precooling device and precooling method. Background Technology

[0002] Most fresh fruits and vegetables have a short natural shelf life, which limits their storage and long-distance transportation capabilities. Extending the shelf life of fruits and vegetables is crucial to meeting market demand. After harvesting, fruits and vegetables carry a large amount of field heat and have a high respiration rate; if they are not pre-cooled in time, the spoilage rate will increase, seriously affecting quality. Therefore, pre-cooling is a key link in cold chain logistics, and its timeliness directly determines the storage time of fruits and vegetables. Existing pre-cooling equipment relies entirely on the evaporation of moisture from the fruits and vegetables themselves to establish the humidity environment inside the chamber. The pre-cooling speed is entirely determined by the initial moisture content, tissue structure, and vacuum pump capacity of the fruits and vegetables. This method results in slow cooling in the initial stage due to insufficient steam, and later, excessive humidity may affect evaporation efficiency. Therefore, a multi-mode fruit and vegetable pre-cooling device and method are urgently needed to solve these problems. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-mode fruit and vegetable precooling device and precooling method to solve the problems existing in the background art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-mode fruit and vegetable precooling device, comprising: Pre-cooling cabinet; One or more partition mechanisms are located within the pre-cooling cabinet. Each partition mechanism includes a pair of side panels connected by a telescopic structure, which is configured to adjust the distance between the two side panels. The telescopic structure is provided with a flow guide pipe and a humidification pipe, and the connecting ends of the flow guide pipe and the humidification pipe extend to the two side panels. Several retractable flow guiding structures are configured to be spliced ​​on the side plate as needed and connected to the flow guiding pipe on the side plate through connecting pipes. When the retractable flow guiding structures are deployed, they form a flow guiding canopy containing flow guiding channels, guiding the airflow into the flow guiding channels and converging into the flow guiding pipe along the flow guiding channels. Several atomizing tubes are configured to be spliced ​​on the side plate as needed, and connected to the humidification pipe on the side plate via connecting pipes. Each atomizing tube is equipped with multiple atomizing nozzles.

[0005] Preferably, rollers or roller shafts are provided at the top and bottom of the side panel, and airbag strips are installed on the edge of the side panel. The airbag strips are configured to fill the gap between the side panel and the corresponding inner wall of the pre-cooling cabinet when inflated.

[0006] Preferably, the airflow guiding canopy includes: An upper inflatable layer is provided with a number of perforated ribs. When the upper inflatable layer is inflated, the perforated ribs expand and support the upper inflatable layer, forming a flow channel within the upper inflatable layer. The lower air intake layer has multiple air inlets on its downward-facing side, and the air inlets are connected to the flow guide channel. The air inlets are configured to guide airflow into the flow guide channel.

[0007] Preferably, the atomizing tube is composed of multiple sub-tube units connected by movable joints, the movable joints being configured to adjust the angle between adjacent sub-tube units as needed, and each sub-tube unit being provided with one or more atomizing nozzles.

[0008] Preferably, the atomizing nozzle is provided with a flow equalization plate, which is configured to guide the atomizing nozzle to generate single-point spray in a specified direction to form multi-point spray.

[0009] Preferably, the flow equalization plate has a connecting pipe at its bottom, which is used to install on the atomizing nozzle and receive all the spray generated by the atomizing nozzle; the flow equalization plate has several mist outlets at its top; the flow equalization plate has a central channel and side channels, the diameter of the central channel is smaller than the inner diameter of the connecting pipe, and it is coaxial with the connecting pipe; the side channels include a main channel and branches, each branch is connected to the main channel, and the inner diameter of the main channel gradually decreases from the central channel to both sides of the central channel; the central channel and each branch are connected to an independent mist outlet.

[0010] Preferably, the connecting pipe is movably connected to the atomizing nozzle and is used to adjust the position and orientation of the flow equalization plate as needed.

[0011] Preferably, the side plate is provided with a plurality of first mounting positions and a plurality of second mounting positions; the first mounting positions are arranged in pairs, including a pair of opposite first sliding grooves arranged in the vertical direction, a first slider is slidably installed in the first sliding groove, a first connecting block is installed on the first slider, and the first connecting block is used to splice with both ends of the retractable flow guide structure and to support and fix the retractable flow guide structure. The second mounting position includes a second sliding groove arranged in a vertical direction, a second slider is slidably installed in the second sliding groove, and a second connecting block is installed on the second slider. The second connecting block is used to connect with one end of the atomizing tube and to support and fix the atomizing tube.

[0012] Preferably, the second mounting position is located below the first mounting position in the vertical direction, and a plurality of first mounting positions and a plurality of second mounting positions are alternately arranged in the vertical direction on the side plate.

[0013] This invention also discloses a multi-mode fruit and vegetable precooling method, which uses a multi-mode fruit and vegetable precooling device to precool fruits and vegetables, including the following steps: S1. Stack the fruits and vegetables onto one or more shelves and push them into the pre-cooling cabinet; S2. Move the partition mechanism to the gap between two shelves or between the shelf and the pre-cooling cabinet, unfold the telescopic structure so that one side panel is close to the shelf and the other side panel is close to the inner wall of the pre-cooling cabinet or another shelf, filling the gap between the two shelves or between the pre-cooling cabinet and the shelf. S3. Pull the retractable flow guide structure to form a flow guide canopy above each shelf layer; at the same time, pull the atomizing tube to position it below each shelf layer, and adjust the position and orientation of the flow distribution plate according to the fruits and vegetables placed on the shelf. S4. Inflate the airbag strips of the side panel and the upper air layer of the air-guiding canopy, fill the gap between the side panel and the corresponding inner wall of the pre-cooling cabinet with the airbag strips, and inflate the upper air layer to expand the perforated ribs and support the upper air layer, forming a flow channel in the upper air layer. S5. Close the pre-cooling cabinet door and perform multi-mode pre-cooling as needed, including: Mode 1: Independently open the diversion pipes, and in conjunction with the diversion canopy, form a high-speed steam channel at the top of each shelf layer, so that the water vapor generated by evaporation inside the fruits and vegetables can be drawn away along the shortest path. Mode 2: Independently activate the humidification pipes, and in conjunction with the atomizing pipes, generate multiple spray points at the bottom of each shelf layer to perform localized independent water replenishment operations as needed; Mode 3: Simultaneously activate the flow diversion pipe and the humidification pipe.

[0014] Beneficial effects: This invention, through the partition mechanism, can divide the pre-cooling cabinet into multiple independent spaces as needed, based on the number of shelves inside. Furthermore, by deploying a retractable structure, it actively fills all free space outside the gaps between goods, eliminating ineffective space. This allows the pressure to drop rapidly to near the water saturation point during vacuum pre-cooling, reducing energy loss. The retractable airflow guiding structure creates an airflow canopy above the fruits and vegetables, based on their position on the shelves. This ensures that water vapor generated during evaporation from the fruits and vegetables is extracted with the shortest path and highest efficiency during pre-cooling. The system maintains a consistently low vapor pressure on the surface, ensuring a continuous and rapid evaporation and cooling process. It can be flexibly configured according to the fruit and vegetable stacking position to actively guide the internal flow field, effectively shortening the overall cooling time. Through the atomizing tubes, independent localized sprays can be generated at the bottom of each shelf layer based on the type of fruit and vegetable, directly providing an evaporation source on the fruit surface, bypassing internal migration resistance and reducing overall pre-cooling time. Furthermore, the use of a flow-guiding canopy in conjunction with the atomizing tubes efficiently guides the generated spray, optimizing the spatial flow field within each shelf layer, preventing localized condensation and ensuring continuous cooling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the multi-mode fruit and vegetable precooling device of the present invention; Figure 2 This is a schematic diagram of the partition mechanism of the present invention; Figure 3 This is a front view of the partition mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the airflow guiding canopy of the present invention; Figure 5 For the present invention Figure 2 Schematic diagram of the structure of region A in the middle; Figure 6 This is a schematic diagram of the internal structure of the flow equalization plate of the present invention; The diagram is labeled as follows: 1. Pre-cooling cabinet; 21. Side panel; 22. Telescopic structure; 23. Guide pipe; 24. Humidification pipe; 25. Roller; 26. Airbag strip; 27. Groove; 28. First mounting position; 281. First slide groove; 282. First slider; 283. First connecting block; 29. ​​Second mounting position; 291. Second slide groove; 292. Second slider; 293. Second connecting block; 3. Telescopic guide structure; 31. Guide canopy; 311. Upper air layer; 312. Lower air intake layer; 313. Perforated rib; 314. Guide channel; 315. Air inlet; 41. Sub-pipe unit; 42. Movable joint; 43. Atomizing nozzle; 44. Flow equalization plate; 441. Mist outlet; 442. Central flow channel; 443. Side flow channel; 4431. Main channel; 4432. Branch channel. Detailed Implementation

[0016] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0017] Example: Figure 1 As shown, a multi-mode fruit and vegetable precooling device includes a precooling cabinet 1 and one or more partition mechanisms installed inside the precooling cabinet 1, one or more retractable flow guide structures 3 and atomizing tubes installed on the partition mechanisms as needed; Reference Figure 2 and Figure 3As shown, the partition mechanism includes a pair of side plates 21 connected by a telescopic structure 22. The telescopic structure 22 is configured to adjust the distance between the two side plates 21, thereby adjusting the volume of the entire partition mechanism as needed and eliminating ineffective space as much as possible. The telescopic structure 22 can be a corrugated pipe or metal corrugated pipe with an inner lining or reinforcing ring to achieve a high elastic modulus and resistance to instability. The telescopic structure 22 is provided with a flow guide pipe 23 and a humidification pipe 24, and the connecting ends of the flow guide pipe 23 and the humidification pipe 24 extend to the two side plates 21. Rollers 25 or roller shafts are provided at the top and bottom of the side plates 21, and airbag strips 26 are installed on the edges of the side plates 21. The airbag strips 26 are configured to fill the gap between the side plate 21 and the corresponding inner wall of the pre-cooling cabinet 1 when inflated.

[0018] The retractable flow guide structure 3 is configured to be spliced ​​onto the side plate 21 as needed, and is connected to the connecting end of the flow guide pipe 23 on the side plate 21 via a connecting pipe. When the retractable flow guide structure 3 is unfolded, it forms a flow guide canopy 31 containing a flow guide channel 314, guiding the airflow into the flow guide channel 314 and converging into the flow guide pipe 23 along the flow guide channel 314; Reference Figure 2 and 4 As shown, multiple pipes are installed on the retractable flow guide structure 3, and the pipes are connected to the connecting end of the flow guide pipe 23 located at the side plate 21. A groove 27 is opened on the side plate 21, and multiple first mounting positions 28 are arranged on both sides of the groove 27 along the vertical direction. A first connecting block 283 is provided at the first mounting position 28. A structure that splices with the first connecting block 283 is provided at both ends of the retractable flow guide structure 3. The retractable flow guide structure 3 can be stably fixed to one side of the side plate 21 by using two first connecting blocks 283. When in use, the retractable flow guide structure 3 is pulled to unfold it to form a flow guide canopy 31. In one embodiment, reference Figure 2 As shown, a first sliding groove 281 is vertically arranged in the first mounting position 28. A first slider 282 is slidably installed in the first sliding groove 281, and a first connecting block 283 is installed on the first slider 282. By utilizing the cooperation between the first slider 282 and the first sliding groove 281, the position of the retractable flow guiding structure 3 can be adjusted vertically along the first sliding groove 281, so that the distance between the flow guiding canopy 31 and the fruits and vegetables can be flexibly adjusted according to the specific situation of fruit and vegetable stacking, thereby more effectively guiding the steam flow.

[0019] In one embodiment, reference Figure 4As shown, the airflow canopy 31 includes an upper inflatable layer 311 and a lower air inlet layer 312. The upper inflatable layer 311 has several perforated ribs 313 and is connected to an external inflation device via inflation pipes. The upper inflatable layer 311 is configured such that the perforated ribs 313 expand and support the upper inflatable layer 311 when inflated, forming a flow channel 314 within the upper inflatable layer 311. The lower air inlet layer 312 has multiple air inlets 315 on its downward-facing side. Furthermore, the air inlet 315 is connected to the flow channel 314. The air inlet 315 is configured to guide the airflow into the flow channel 314. When not inflated, the perforated rib 313 is in a retracted state, and the entire flow canopy 31 can be flexibly folded and hidden. In addition, the weight of the entire flow canopy 31 is greatly reduced. At the same time, it can adapt to different spaces by utilizing its own deformability based on its inflation characteristics, thus solving the problem that traditional flow deflectors are limited by space and cannot be flexibly deployed.

[0020] Several atomizing tubes are configured to be spliced ​​onto the side panel 21 as needed, and connected to the connection end of the humidification pipe 24 on the side panel 21 via connecting pipes. Multiple atomizing nozzles 43 are provided on the atomizing tubes. (See reference...) Figure 2 and Figure 5 As shown, the atomizing tube is composed of multiple sub-tube units 41 connected by movable joints 42. The movable joints 42 are configured to adjust the angle between adjacent sub-tube units 41 as needed. Each sub-tube unit 41 is provided with one or more atomizing nozzles 43.

[0021] In one embodiment, a flow equalization plate 44 is provided on the atomizing nozzle 43. The flow equalization plate 44 is configured to guide the atomizing nozzle 43 to generate single-point spray in a specified direction to form multi-point spray. (Refer to...) Figure 5 and Figure 6 As shown, a connecting pipe is provided at the bottom of the flow equalization plate 44. The connecting pipe is used to install on the atomizing nozzle 43 and receive all the spray generated by the atomizing nozzle 43. Several mist outlets 441 are provided at the top of the flow equalization plate 44. A central flow channel 442 and a side flow channel 443 are provided inside the flow equalization plate 44. The diameter of the central flow channel 442 is smaller than the inner diameter of the connecting pipe, and it is coaxial with the connecting pipe. The side flow channel 443 includes a main channel 4431 and branches 4432. Each branch 4432 is connected to the main channel 4431, and the main channel 4431... The inner diameter gradually decreases from the central flow channel 442 to both sides of the central flow channel 442; the central flow channel 442 and each branch 4432 are connected to an independent mist outlet 441, and the connecting pipe is movably connected to the atomizing nozzle 43, which is used to adjust the position and orientation of the flow equalization plate 44 as needed. Compared with the traditional spray structure, on the one hand, it can reduce the number of spray heads, and on the other hand, it can adjust the spray direction by adjusting the position and orientation of the flow equalization plate 44 according to the fruit and vegetable stacking position, without the need to adjust the spray head orientation, making it more convenient to use.

[0022] In one embodiment, reference Figures 2-3As shown, a second mounting position 29 is provided below each first mounting position 28 within the groove 27. The second mounting position 29 includes a second sliding groove 291 arranged vertically. A second slider 292 is slidably installed within the second sliding groove 291. A second connecting block 293 is installed on the second slider 292. The second connecting block 293 is used to connect with one end of the atomizing tube and to support and fix the atomizing tube. By using the second slider 292 in conjunction with the second sliding groove 291, the position of the atomizing tube can be adjusted vertically along the second sliding groove 291 so that it can be arranged close to the fruit and vegetable stacking position, so as to fully transfer steam to the surface of the fruit and vegetables.

[0023] In another embodiment, a multi-mode fruit and vegetable precooling method is also disclosed, which uses a multi-mode fruit and vegetable precooling device to precool fruits and vegetables, including the following steps: S1. Stack the fruits and vegetables onto one or more shelves and push them into the pre-cooling cabinet 1; S2. Move the partition mechanism to the gap between two shelves or between the shelf and the pre-cooling cabinet 1, and unfold the telescopic structure 22 so that one side panel 21 is close to the shelf and the other side panel 21 is close to the inner wall of the pre-cooling cabinet 1 or another shelf, filling the gap between the two shelves or between the pre-cooling cabinet 1 and the shelf. S3. Pull the retractable flow guide structure 3 and use the first slider 282 to adjust the position of the retractable flow guide structure 3, positioning the flow guide canopy 31 10-15 cm above the top of each shelf layer; at the same time, pull the atomizing tube to position it below each shelf layer, and adjust the position and orientation of the flow equalization plate 44 according to the density of fruit and vegetable placement to ensure that the atomization coverage has no dead angles; use the matching pipes to connect the retractable flow guide structure 3 to the flow guide pipe 23, and the atomizing tube to the humidification pipe 24. The flow guide pipe 23 and the humidification pipe 24 are both connected to the pre-set air extraction pipe and water replenishment pipe in the pre-cooling cabinet 1 through the matching pipes, and the corresponding air extraction and water replenishment operations are performed as needed through the external vacuum system and water replenishment system; S4. Inflate the airbag strips 26 of the side panel 21 and the upper inflation layer 311 of the air-guiding canopy 31. Use the airbag strips 26 to fill the gap between the side panel 21 and the inner wall of the corresponding pre-cooling cabinet 1. Inflate the upper inflation layer 311 to make the perforated ribs 313 expand and support the upper inflation layer 311, forming a flow channel 314 in the upper inflation layer 311. S5. Close the door of pre-cooling cabinet 1, start the vacuum system, and perform multi-mode pre-cooling as needed, including: Mode 1: Independently open the flow guide pipe 23, and in conjunction with the flow guide canopy 31, form a high-speed steam channel at the top of each shelf layer, so that the water vapor generated by evaporation inside the fruits and vegetables can be drawn away along the shortest path. Mode 2: Independently activate the humidification pipe 24, and in conjunction with the atomizing pipe, generate multiple spray points at the bottom of each shelf layer to perform localized independent water replenishment as needed; Mode 3: Simultaneously activate the flow guide pipe 23 and the humidification pipe 24, and set the circulation program: alternate between air extraction and atomization; in the initial stage, mode 1 is the main mode for rapid cooling; in the middle stage, switch to mode 2 to replenish moisture and balance the water loss rate; in the later stage, a hybrid mode is used to finely control the temperature and humidity.

[0024] The embodiments of the present invention have been described in detail above with reference to the examples. However, the present invention is not limited to the above embodiments. For those skilled in the art, after learning the contents described in the present invention, several equivalent changes and substitutions can be made without departing from the principle of the present invention. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A multi-mode fruit and vegetable precooling device, characterized in that: include: Pre-cooling cabinet; One or more partition mechanisms are located within the pre-cooling cabinet. Each partition mechanism includes a pair of side panels connected by a telescopic structure, which is configured to adjust the distance between the two side panels. The telescopic structure is provided with a flow guide pipe and a humidification pipe, and the connecting ends of the flow guide pipe and the humidification pipe extend to the two side panels. Several retractable flow guiding structures are configured to be spliced ​​on the side plate as needed and connected to the flow guiding pipe on the side plate through connecting pipes. When the retractable flow guiding structures are deployed, they form a flow guiding canopy containing flow guiding channels, guiding the airflow into the flow guiding channels and converging into the flow guiding pipe along the flow guiding channels. Several atomizing tubes are configured to be spliced ​​on the side plate as needed, and connected to the humidification pipe on the side plate via connecting pipes. Each atomizing tube is equipped with multiple atomizing nozzles.

2. The multi-mode fruit and vegetable precooling device according to claim 1, characterized in that: Rollers or rollers are provided at the top and bottom of the side panel, and airbag strips are installed on the edge of the side panel. The airbag strips are configured to fill the gap between the side panel and the corresponding inner wall of the pre-cooling cabinet when inflated.

3. The multi-mode fruit and vegetable precooling device according to claim 2, characterized in that: The airflow guiding canopy includes: An upper inflatable layer is provided with a number of perforated ribs. When the upper inflatable layer is inflated, the perforated ribs expand and support the upper inflatable layer, forming a flow channel within the upper inflatable layer. The lower air intake layer has multiple air inlets on its downward-facing side, and the air inlets are connected to the flow guide channel. The air inlets are configured to guide airflow into the flow guide channel.

4. The multi-mode fruit and vegetable precooling device according to claim 1, characterized in that: The atomizing tube is composed of multiple sub-tube units connected by movable joints. The movable joints are configured to adjust the angle between adjacent sub-tube units as needed. Each sub-tube unit is provided with one or more atomizing nozzles.

5. A multi-mode fruit and vegetable precooling device according to claim 4, characterized in that: The atomizing nozzle is provided with a flow equalization plate, which is configured to guide the atomizing nozzle to generate single-point spray in a specified direction to form multi-point spray.

6. The multi-mode fruit and vegetable precooling device according to claim 5, characterized in that: The flow equalization plate has a connecting pipe at its bottom, which is used to install on the atomizing nozzle and receive all the spray generated by the atomizing nozzle. The flow equalization plate has several mist outlets at its top. The flow equalization plate has a central channel and side channels. The diameter of the central channel is smaller than the inner diameter of the connecting pipe, and the central channel is coaxial with the connecting pipe. The side channels include a main channel and branches. Each branch is connected to the main channel, and the inner diameter of the main channel gradually decreases from the central channel to both sides of the central channel. The central channel and each branch are connected to an independent mist outlet.

7. A multi-mode fruit and vegetable precooling device according to claim 6, characterized in that: The connecting pipe is movably connected to the atomizing nozzle and is used to adjust the position and orientation of the flow equalization plate as needed.

8. A multi-mode fruit and vegetable precooling device according to any one of claims 1-7, characterized in that: The side plate is provided with a plurality of first mounting positions and a plurality of second mounting positions; the first mounting positions are arranged in pairs, including a pair of opposite first sliding grooves arranged in the vertical direction, a first slider is slidably installed in the first sliding groove, a first connecting block is installed on the first slider, and the first connecting block is used to splice with both ends of the retractable flow guide structure and to support and fix the retractable flow guide structure. The second mounting position includes a second sliding groove arranged in a vertical direction, a second slider is slidably installed in the second sliding groove, and a second connecting block is installed on the second slider. The second connecting block is used to connect with one end of the atomizing tube and to support and fix the atomizing tube.

9. A multi-mode fruit and vegetable precooling device according to claim 8, characterized in that: The second mounting position is located below the first mounting position in the vertical direction, and multiple first mounting positions and multiple second mounting positions are alternately arranged in the vertical direction on the side plate.

10. A multi-mode fruit and vegetable precooling method, characterized in that: Pre-cooling fruits and vegetables using the multi-mode fruit and vegetable pre-cooling device according to claim 8 includes the following steps: S1. Stack the fruits and vegetables onto one or more shelves and push them into the pre-cooling cabinet; S2. Move the partition mechanism to the gap between two shelves or between the shelf and the pre-cooling cabinet, unfold the telescopic structure so that one side panel is close to the shelf and the other side panel is close to the inner wall of the pre-cooling cabinet or another shelf, filling the gap between the two shelves or between the pre-cooling cabinet and the shelf. S3. Pull the retractable flow guide structure to form a flow guide canopy above each shelf layer; at the same time, pull the atomizing tube to position it below each shelf layer, and adjust the position and orientation of the flow distribution plate according to the fruits and vegetables placed on the shelf. S4. Inflate the airbag strips of the side panel and the upper air layer of the air-guiding canopy. Utilize the gap between the airbag strip side panel and the corresponding inner wall of the pre-cooling cabinet to inflate the upper air layer, causing the perforated ribs to expand and support the upper air layer, forming a flow channel within the upper air layer. S5. Close the pre-cooling cabinet door and perform multi-mode pre-cooling as needed, including: Mode 1: Independently open the diversion pipes, and in conjunction with the diversion canopy, form a high-speed steam channel at the top of each shelf layer, so that the water vapor generated by evaporation inside the fruits and vegetables can be drawn away along the shortest path. Mode 2: Independently activate the humidification pipes, and in conjunction with the atomizing pipes, generate multiple spray points at the bottom of each shelf layer to perform localized independent water replenishment operations as needed; Mode 3: Simultaneously activate the flow diversion pipe and the humidification pipe.

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