Pre-cooling unit

Abstract

The utility model belongs to freight technology field, concretely relates to a precooling unit. The precooling unit includes: multiple containing boxes;Multiple separators correspond with multiple containing boxes one to one, and the separator is located in the corresponding containing box to form circulation cavity and storage cavity, and the circulation cavity is communicated with the storage cavity;The air draft subassembly is located on the separator and is located in the storage cavity, and the air draft subassembly is communicated with the circulation cavity;Multiple gasification subassemblies correspond with multiple containing boxes one to one, and the gasification subassembly is communicated with the storage cavity of the corresponding containing box;Liquid nitrogen supply subassembly is communicated with multiple gasification subassemblies.

Description

Technical Field

[0001] This application belongs to the field of freight technology, specifically relating to a precooling unit. Background Technology

[0002] Tropical fruits (such as durian) carry a lot of field heat after being picked (the field environment is hot and the fruit respiration is vigorous), resulting in an initial temperature that is too high (usually above 30°C).

[0003] After harvesting, tropical fruits are directly transported in refrigerated trucks. However, the continuous release of heat during transport causes drastic temperature fluctuations within the refrigerated trucks, requiring the refrigeration units to operate at high loads to maintain a low-temperature environment. This not only increases energy consumption but may also lead to problems such as increased cargo damage rates due to insufficient refrigeration, a surge in refrigeration unit load, and increased transportation energy consumption. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a pre-cooling unit, which aims to at least partially solve the technical issues of increased energy consumption and higher damage rates caused by directly transporting harvested tropical fruits into refrigerated trucks.

[0005] The technical solution of this utility model is as follows: A precooling unit, characterized in that it comprises: multiple receiving tanks; multiple partitions corresponding one-to-one with the multiple receiving tanks, the partitions being disposed within the corresponding receiving tanks to form a circulation chamber and a storage chamber, the circulation chamber being in communication with the storage chamber; an exhaust assembly disposed on the partitions and located within the storage chamber, the exhaust assembly being in communication with the circulation chamber; multiple vaporization assemblies corresponding one-to-one with the multiple receiving tanks, the vaporization assemblies being in communication with the storage chamber of the corresponding receiving tank; and a liquid nitrogen supply assembly in communication with the multiple vaporization assemblies.

[0006] In some embodiments, the vaporization assembly includes: a first vaporization tube connected to the liquid nitrogen supply assembly; two second vaporization tubes connected at an angle to the first vaporization tube, the two second vaporization tubes being spaced apart; wherein the second vaporization tubes are provided with a plurality of first nozzles connected to the storage cavity.

[0007] In some embodiments, the vaporization assembly further includes: a plurality of third vaporization tubes communicating at an angle with the second vaporization tube, the plurality of third vaporization tubes being spaced apart; wherein, the third vaporization tubes are provided with a plurality of second nozzles communicating with the storage cavity.

[0008] In some embodiments, the separator is located between the two second vaporization tubes.

[0009] In some embodiments, the separator has four sides, at least one of which is spaced from the inner wall of the container, and the remaining sides are connected to the inner wall of the container.

[0010] In some embodiments, the liquid nitrogen supply assembly includes: a first delivery pipe; a plurality of second delivery pipes corresponding one-to-one with the plurality of vaporization components, the two ends of the second delivery pipes being connected to the first delivery pipe and the corresponding vaporization component respectively; and a plurality of control valves corresponding one-to-one with the plurality of second delivery pipes, the control valves being disposed on the corresponding second delivery pipes for controlling the on / off state of the second delivery pipes.

[0011] In some implementations, the precooling unit further includes: a first controller electrically connected to the control valve; and a temperature sensor disposed in the storage cavity and electrically connected to the first controller.

[0012] In some embodiments, the exhaust assembly includes one or more circulating fans; wherein, when there are multiple circulating fans, the multiple circulating fans are spaced apart along the height direction of the housing.

[0013] In some implementations, the precooling unit further includes: a second controller; an exhaust valve connected to the containment tank and electrically connected to the second controller; and a pressure sensor located inside the containment tank and electrically connected to the second controller.

[0014] In some embodiments, the containment box includes: a first box body; a second box body disposed within the first box body; and a thermal insulation element disposed between the first box body and the second box body.

[0015] The beneficial effects of this utility model include at least the following: Because multiple partitions correspond one-to-one with multiple receiving boxes, and the partitions are located within the corresponding receiving boxes to form circulation chambers and storage chambers, goods can be placed into the storage chambers. Since the exhaust system is located on the partitions and within the storage chambers, and is connected to the circulation chamber, multiple vaporization components correspond one-to-one with multiple receiving boxes, and are connected to the storage chambers of the corresponding receiving boxes, and the liquid nitrogen supply system is connected to the multiple vaporization components, when tropical fruits need to be pre-cooled, the liquid nitrogen supply system delivers liquid nitrogen to the multiple vaporization components. The multiple vaporization components vaporize the liquid nitrogen to form nitrogen gas, which is then sent into the storage chambers. Under the extraction action of the exhaust system, the nitrogen gas can quickly and directly impact and cool the goods, achieving pre-cooling of the goods, reducing the initial temperature of the goods, reducing the load on the refrigeration unit during transportation, increasing the driving range, and reducing transportation energy consumption and cargo damage rate. The exhaust system draws the nitrogen gas, which has cooled the goods, into the circulation chamber. Since the circulation chamber is connected to the storage chamber, the nitrogen gas entering the circulation chamber can enter the storage chamber to cool the goods again, thus realizing the recycling of nitrogen gas, reducing the amount of liquid nitrogen used, and lowering costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 These are schematic diagrams of the precooling unit in some embodiments; Figure 2 for Figure 1 Schematic diagram of the gasification components of the precooling unit; Figure 3 for Figure 2 Schematic diagram of the gasification unit; Figure 4 for Figure 1 Schematic diagram of the liquid nitrogen supply assembly of the intermediate precooling unit; Figure 5 for Figure 1 Schematic diagram of the exhaust system layout for the precooling unit; Figure 6 for Figure 1 Schematic diagram of the exhaust valve of the intermediate precooling unit; Figure 7 for Figure 1 A schematic diagram of the structure of the housing box of the precooling unit.

[0018] In the attached image: 10 containing container, 11 circulating chamber, 12 storage chamber, 13 first box, 14 second box; Separator 20; Exhaust assembly 30, circulating fan 31; Vaporization assembly 40, first vaporization pipe 41, second vaporization pipe 42, first nozzle 43, third vaporization pipe 44, second nozzle 45; liquid nitrogen supply assembly 50, first delivery pipe 51, second delivery pipe 52, control valve 53. Exhaust valve 60. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] This application is described below with reference to the accompanying drawings and specific embodiments: The precooling unit provided in this embodiment aims to at least partially solve the technical problem of increased energy consumption and higher cargo damage rate caused by directly transporting harvested tropical fruits into refrigerated trucks.

[0024] Figure 1 This is a structural schematic diagram of a precooling unit according to some embodiments. (Combined with...) Figure 1 The precooling unit in this embodiment includes: a housing 10, partitions 20, an exhaust assembly 30, a vaporization assembly 40, and a liquid nitrogen supply assembly 50. Multiple partitions 20 correspond one-to-one with multiple housing 10s, and are disposed within the corresponding housing 10s to form a circulation chamber 11 and a storage chamber 12, which are connected. The exhaust assembly 30 is disposed on the partitions 20 and located within the storage chamber 12, and is connected to the circulation chamber 11. Multiple vaporization assemblies 40 correspond one-to-one with multiple housing 10s, and are connected to the storage chamber 12 of the corresponding housing 10. The liquid nitrogen supply assembly 50 is connected to the multiple vaporization assemblies 40.

[0025] The fan assembly is located in the middle of the partition 20.

[0026] Since multiple separators 20 correspond one-to-one with multiple containers 10, and the separators 20 are located in the corresponding containers 10 to form a circulation cavity 11 and a storage cavity 12, goods can be placed into the storage cavity 12. Since the exhaust assembly 30 is located on the partition 20 and inside the storage cavity 12, the exhaust assembly 30 is connected to the circulation cavity 11. Multiple vaporization assemblies 40 correspond one-to-one with multiple receiving boxes 10, and the vaporization assemblies 40 are connected to the storage cavity 12 of the corresponding receiving box 10. The liquid nitrogen supply assembly 50 is connected to the multiple vaporization assemblies 40. Therefore, when it is necessary to pre-cool tropical fruits, the liquid nitrogen supply assembly 50 delivers liquid nitrogen to the multiple vaporization assemblies 40. The multiple vaporization assemblies 40 vaporize the liquid nitrogen to form nitrogen gas and send the nitrogen gas into the storage cavity 12. Under the extraction action of the exhaust assembly 30, the nitrogen gas can quickly and directly impact and cool the goods, thereby pre-cooling the goods, reducing the initial temperature of the goods, reducing the load on the refrigeration unit during transportation, increasing the driving range, and reducing transportation energy consumption and cargo damage rate. The exhaust assembly 30 draws the nitrogen gas that has cooled the goods into the circulation chamber 11. Since the circulation chamber 11 is connected to the storage chamber 12, the nitrogen gas that enters the circulation chamber 11 can enter the storage chamber 12 to cool the goods again, realizing the recycling of nitrogen gas, which can reduce the amount of liquid nitrogen used and reduce costs.

[0027] In some embodiments, the partition 20 has a mounting hole, and the exhaust assembly 30 is mounted in the mounting hole. The mounting hole penetrates the partition 20 along the thickness direction of the partition 20 to achieve communication between the exhaust assembly 30 and the circulation chamber 11.

[0028] Figure 2 for Figure 1 Schematic diagram of the gasification components of the precooling unit; Figure 3 for Figure 2 A schematic diagram of the gasification unit. (Combined with...) Figure 1 , Figure 2 and Figure 3 To achieve the vaporization of liquid nitrogen, the vaporization assembly 40 includes a first vaporization pipe 41 and two second vaporization pipes 42. The first vaporization pipe 41 is connected to the liquid nitrogen supply assembly 50. The two second vaporization pipes 42 are connected to the first vaporization pipe 41 at an angle and are spaced apart. Each second vaporization pipe 42 is provided with multiple first nozzles 43 that communicate with the storage chamber 12. The first nozzles 43 can be liquid nitrogen atomizing nozzles.

[0029] The liquid nitrogen supply assembly 50 delivers liquid nitrogen to the first vaporization pipe 41, which in turn supplies liquid nitrogen to two second vaporization pipes 42. The liquid nitrogen in the second vaporization pipes 42 is atomized by multiple first nozzles 43 and sprayed into the storage cavity 12 along the thickness direction of the receiving cavity 10 to cool the goods in the storage cavity 12 and achieve pre-cooling of the goods.

[0030] The arrangement of multiple first nozzles 43 allows the nitrogen gas formed after liquid nitrogen vaporization to be simultaneously sprayed into the storage cavity 12 from different positions. The liquid nitrogen enters from multiple points, avoiding the concentration of liquid nitrogen in one area as with a single nozzle, thus providing wider coverage of the goods within the storage cavity 12. This ensures that the nitrogen gas is evenly distributed around the goods, resulting in more uniform cooling of all parts of the goods. Furthermore, the uniform liquid nitrogen spray helps reduce the temperature gradient within the storage cavity 12. The uniform spraying from multiple first nozzles 43 makes the temperature distribution within the storage cavity 12 more even, preventing localized overheating or undercooling, and ensuring that the goods reach the ideal cooling temperature throughout the entire storage cavity 12.

[0031] Liquid nitrogen vaporization is an endothermic process. After the first nozzle 43 vaporizes the liquid nitrogen, it rapidly absorbs a large amount of heat from the surrounding environment (including the cargo). Moreover, compared to liquid nitrogen, vaporized nitrogen can exchange heat with the cargo more quickly, shortening the cooling time. The vaporized nitrogen diffuses evenly within the storage cavity 12 in gaseous form, ensuring comprehensive contact with the cargo. The gas's excellent diffusion properties allow it to penetrate every corner and crevice of the cargo, ensuring thorough heat exchange with the nitrogen in all parts of the cargo and achieving uniform cooling.

[0032] If liquid nitrogen is sprayed directly in liquid form, it may cause localized supercooling near the injection point, while other areas may not be adequately cooled. After the first nozzle 43 vaporizes the liquid nitrogen, the nitrogen gas can be evenly distributed within the storage cavity 12, preventing sudden temperature drops caused by localized liquid nitrogen accumulation. Regardless of the complexity of the goods' arrangement within the storage cavity 12, the vaporized nitrogen gas can evenly coat the goods. For irregularly shaped or densely packed goods, the vaporized nitrogen gas can easily penetrate the gaps between the goods, ensuring that each item receives uniform cooling.

[0033] In some embodiments, a plurality of first nozzles 43 are evenly spaced at equal intervals.

[0034] In some embodiments, to further ensure uniform cooling of the cargo, the cargo is positioned between two second vaporization pipes 42. The two second vaporization pipes 42 respectively inject liquid nitrogen vaporization from both sides of the cargo, allowing the vaporized nitrogen to cool the cargo from different angles. Compared to a single vaporization pipe, this multi-angle cooling method avoids temperature differences caused by insufficient cooling on one side of the cargo. Furthermore, because the cargo is positioned between the two second vaporization pipes 42, the vaporized nitrogen can more fully fill the space around the cargo, reducing the existence of cooling dead zones and ensuring overall uniform cooling of the cargo.

[0035] In some embodiments, the liquid nitrogen supply component 50 is connected to the middle of the first vaporization tube 41, and the two second vaporization tubes 42 can be connected to both ends of the first vaporization tube 41. The liquid nitrogen supply component 50 delivers liquid nitrogen to the first vaporization tube 41, and the first vaporization tube 41 distributes liquid nitrogen to the two second vaporization tubes 42.

[0036] In some embodiments, the included angle between the first vaporization tube 41 and the second vaporization tube 42 can be set from 45° to 135°. In this embodiment, the included angle between the first vaporization tube 41 and the second vaporization tube 42 is 90°, that is, the first vaporization tube 41 and the second vaporization tube 42 are set perpendicularly, and this should not be construed as a limitation of this application.

[0037] In some embodiments, to further ensure uniform cooling of the goods, the vaporization assembly 40 further includes a third vaporization pipe 44. A plurality of third vaporization pipes 44 are connected at an angle to the second vaporization pipe 42, and the plurality of third vaporization pipes 44 are spaced apart. Each third vaporization pipe 44 is provided with a plurality of second nozzles 45 communicating with the storage chamber 12. The second nozzles 45 may be liquid nitrogen atomizing nozzles.

[0038] The liquid nitrogen supply assembly 50 delivers liquid nitrogen to the first vaporization pipe 41, which in turn supplies liquid nitrogen to two second vaporization pipes 42. The liquid nitrogen in the second vaporization pipes 42 is then delivered to the third vaporization pipe 44. The liquid nitrogen in the fourth vaporization pipe 44 is atomized by multiple second nozzles 45 and sprayed into the storage chamber 12 along the height of the receiving cavity 10 to cool the goods in the storage chamber 12 and achieve pre-cooling of the goods.

[0039] The arrangement of multiple second nozzles 45 allows the nitrogen gas formed after liquid nitrogen vaporization to be simultaneously injected into the storage cavity 12 from different positions. The liquid nitrogen enters from multiple points, avoiding the concentration of liquid nitrogen in one area as with a single nozzle, thus providing wider coverage of the goods within the storage cavity 12. This ensures that the nitrogen gas is evenly distributed around the goods, resulting in more uniform cooling of all parts of the goods. Furthermore, the uniform liquid nitrogen injection helps reduce the temperature gradient within the storage cavity 12. The uniform spraying from multiple second nozzles 45 makes the temperature distribution within the storage cavity 12 more even, preventing localized overheating or undercooling, and ensuring that the goods reach the ideal cooling temperature throughout the entire storage cavity 12.

[0040] Liquid nitrogen vaporization is an endothermic process. After the second nozzle 45 vaporizes the liquid nitrogen, it rapidly absorbs a large amount of heat from the surrounding environment (including the cargo). Moreover, compared to liquid nitrogen, vaporized nitrogen can exchange heat with the cargo more quickly, shortening the cooling time. The vaporized nitrogen diffuses evenly within the storage cavity 12 in gaseous form, ensuring comprehensive contact with the cargo. The gas's excellent diffusion properties allow it to penetrate every corner and crevice of the cargo, ensuring thorough heat exchange with the nitrogen in all parts of the cargo and achieving uniform cooling.

[0041] If liquid nitrogen is sprayed directly in liquid form, it may cause localized supercooling near the injection point, while other areas may not be adequately cooled. After the second nozzle 45 vaporizes the liquid nitrogen, the nitrogen gas can be evenly distributed within the storage cavity 12, preventing sudden temperature drops caused by localized liquid nitrogen accumulation. Regardless of the arrangement of the goods within the storage cavity 12, the vaporized nitrogen gas can evenly coat the goods. For irregularly shaped or densely packed goods, the vaporized nitrogen gas can easily penetrate the gaps between the goods, ensuring that each item receives uniform cooling.

[0042] In some embodiments, a plurality of second nozzles 45 are evenly spaced.

[0043] In some embodiments, the included angle between the third vaporization tube 44 and the second vaporization tube 42 can be set to 45° to 135°. In this embodiment, the included angle between the third vaporization tube 44 and the second vaporization tube 42 is 90°, that is, the third vaporization tube 44 and the second vaporization tube 42 are set perpendicularly, and this should not be construed as a limitation of this application.

[0044] In some embodiments, to more clearly describe the arrangement of the first vaporization tube 41, the second vaporization tube 42, and the third vaporization tube 44, the following orientations are defined: the receiving box 10 can be defined relative to the following three mutually perpendicular axes: the transverse axis x, the front-rear axis y, and the central vertical axis z. The transverse axis x is essentially an extension of the width direction of the receiving box 10, the front-rear axis y is essentially the thickness direction of the receiving box 10, and the central vertical axis z is essentially the height direction of the receiving box 10. That is, the first vaporization tube 41 is arranged along the transverse axis x, the second vaporization tube 42 is arranged along the front-rear axis y, and the third vaporization tube 44 is arranged along the central vertical axis z.

[0045] Combination Figure 1 In some embodiments, to ensure that the exhaust assembly 30 can draw nitrogen into the circulation chamber 11, a separator 20 is located between the two second vaporization pipes 42. When the exhaust assembly 30 on the separator 20 is running, it can guide the vaporized nitrogen to flow along a predetermined path. Under the action of the separator 20, the nitrogen will not diffuse randomly, but will flow more concentratedly towards the direction of the exhaust assembly 30, so that the exhaust assembly 30 can draw nitrogen more efficiently.

[0046] Combination Figure 1 In some embodiments, in order to achieve communication between the storage cavity 12 and the circulation cavity 11, the separator 20 has four sides, at least one of which is spaced apart from the inner wall of the container 10, so that nitrogen in the circulation cavity 11 can enter the storage cavity 12 through the gap between at least one of the four sides and the inner wall of the container 10. The remaining four sides are connected to the inner wall of the container 10 to support the separator 20 and ensure the stability of the separator 20 installation.

[0047] In some embodiments, the four sides include a top side, a bottom side, and two side sides. The bottom side is connected to the inner wall of the housing 10 to support the partition 20 through the housing 10. The top side and the two side sides are spaced apart from the inner wall of the housing 10 to form a ventilation channel.

[0048] Of course, in some other embodiments, the peripheral surface of the partition 20 is connected to the inner wall of the receiving box 10 to achieve the installation of the partition 20. The partition 20 has multiple through holes, the two ends of which are connected to the circulation chamber 11 and the storage chamber 12 respectively, so that nitrogen in the circulation chamber 11 can enter the storage chamber 12 through the through holes, realizing the recycling of nitrogen. The exhaust assembly 30 is located in the middle of the partition 20, and the through holes are closer to the peripheral surface of the partition 20 than the exhaust assembly 30, to avoid the exhaust assembly 30 interfering with the nitrogen in the circulation chamber 11 entering the storage chamber 12 through the through holes.

[0049] Figure 4for Figure 1 A schematic diagram of the liquid nitrogen supply assembly of the intermediate precooling unit. (Combined with...) Figure 1 and Figure 4 To supply liquid nitrogen to the vaporization assembly 40, the liquid nitrogen supply assembly 50 includes a first delivery pipe 51, a second delivery pipe 52, and control valves 53. Multiple second delivery pipes 52 correspond one-to-one with multiple vaporization assemblies 40, and their two ends are connected to the first delivery pipe 51 and the corresponding vaporization assembly 40, respectively. Multiple control valves 53 correspond one-to-one with multiple second delivery pipes 52, and are located on the corresponding second delivery pipes 52 to control the on / off state of the second delivery pipes 52.

[0050] The first conveying pipe 51 conveys liquid nitrogen to multiple second conveying pipes 52, and the multiple second conveying pipes 52 convey liquid nitrogen to the corresponding vaporization components 40 respectively, so as to realize the conveying of liquid nitrogen.

[0051] In some embodiments, a delivery pump may be installed on the first delivery pipeline 51 to deliver liquid nitrogen.

[0052] In some embodiments, in order to control the temperature within the receiving cavity 10, the precooling unit further includes: a first controller electrically connected to a control valve. A temperature sensor is disposed within the storage cavity 12 and electrically connected to the first controller.

[0053] A temperature sensor detects the real-time temperature value inside the storage cavity 12 and sends it to the controller. The controller compares the real-time temperature value with a first set temperature value. If the real-time temperature value is less than or equal to the first set temperature value, the controller sends a shut-off signal to the control valve, causing the control valve to cut off the second delivery pipe 52 and stop supplying liquid nitrogen to the vaporization assembly 40, thus conserving liquid nitrogen. If the real-time temperature value is greater than or equal to the second set temperature value, the controller sends an open signal to the control valve, causing the control valve to open the second delivery pipe 52 and supply liquid nitrogen to the vaporization assembly 40 to cool the goods. The first set temperature value can be -37℃, and the second set temperature value can be -17℃.

[0054] Figure 5 for Figure 1 A schematic diagram of the exhaust fan assembly layout for the precooling unit. (Combined with...) Figure 1 and Figure 5 The exhaust assembly 30 includes one or more circulating fans 31. When there are multiple circulating fans, they are spaced apart along the height of the housing 10. The multiple circulating fans 31 can draw nitrogen from the storage chamber 12, so that the nitrogen can flow quickly, ensuring air volume and uniform cooling.

[0055] In some embodiments, the circulating fan 31 consists of a motor and a fan. The housing 10 contains three low-temperature resistant circulating fans 31, each with a motor power of 550W and a speed of up to 1400 rpm. The fan is a low-temperature stainless steel fan with a diameter of 400mm and a uniform wind speed of up to 10 m / s. The circulating fan 31 enhances airflow turbulence by drawing air from the cargo, ensuring enhanced heat exchange between nitrogen and the cargo and accelerating the pre-cooling speed of the cargo.

[0056] Figure 6 for Figure 1 A schematic diagram of the exhaust valve of the intermediate precooling unit. (Combined with...) Figure 1 and Figure 6 To ensure the safety of the housing 10, the precooling unit also includes a second controller, an exhaust valve 60, and a pressure sensor. The exhaust valve 60 is connected to the housing 10 and electrically connected to the second controller. The pressure sensor is located inside the housing 10 and is electrically connected to the second controller.

[0057] A pressure sensor detects the real-time pressure value inside the storage cavity 12 and sends it to the controller. The controller compares the real-time pressure value with a set pressure value. If the real-time pressure value is greater than or equal to the set pressure value, the controller sends an open signal to the exhaust valve 60 to release part of the nitrogen gas inside the container 10, preventing deformation of the container 10 and ensuring its safety. If the real-time pressure value is less than the set pressure value, the controller sends a close signal to the exhaust valve 60 to allow the nitrogen gas to cool the goods. The set pressure value can be 0.1 kPa.

[0058] In some embodiments, the first controller and the second controller may be the same controller. Of course, in other embodiments, the first controller and the second controller may be two independent controllers.

[0059] Figure 7 for Figure 1 A schematic diagram of the housing of the intermediate precooling unit. (Combined with...) Figure 7 To achieve thermal insulation, the container 10 includes a first container 13, a second container 14, and a thermal insulation component. The second container 14 is located inside the first container 13. The thermal insulation component is located between the first container 13 and the second container 14. When goods are placed inside the second container 14, the thermal insulation component effectively blocks heat transfer between the first container 13 and the second container 14, preventing the loss of cold air from the first container 13 and ensuring the cooling effect on the goods. At the same time, it also reduces the influence of the external temperature on the temperature inside the first container 13.

[0060] In some embodiments, in order to achieve thermal insulation, the insulation element can be made of polyurethane and has a thickness of 150 mm.

[0061] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0064] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0065] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A precooling unit, characterized in that, include: Multiple containers; Multiple partitions correspond one-to-one with multiple containers, and the partitions are disposed in the corresponding containers to form a circulation cavity and a storage cavity, wherein the circulation cavity and the storage cavity are in communication; An exhaust assembly is disposed on the partition and located inside the storage cavity; the exhaust assembly is connected to the circulation cavity. Multiple vaporization components correspond one-to-one with multiple receiving boxes, and the vaporization components are connected to the storage chambers of the corresponding receiving boxes; A liquid nitrogen supply assembly is connected to multiple of the aforementioned vaporization assemblies.

2. The precooling unit according to claim 1, characterized in that, The gasification component includes: The first vaporization pipe is connected to the liquid nitrogen supply assembly; Two second vaporization tubes are connected to the first vaporization tube at an angle, and the two second vaporization tubes are spaced apart; The second vaporization pipe is provided with a plurality of first nozzles that communicate with the storage cavity.

3. The precooling unit according to claim 2, characterized in that, The gasification component also includes: Multiple third vaporization tubes are connected to the second vaporization tube at an angle, and the multiple third vaporization tubes are spaced apart; The third vaporization pipe is equipped with multiple second nozzles that communicate with the storage cavity.

4. The precooling unit according to claim 2, characterized in that, The separator is located between the two second vaporization tubes.

5. The precooling unit according to any one of claims 1-4, characterized in that, The separator has four sides, at least one of which is spaced apart from the inner wall of the container, and the remaining sides are connected to the inner wall of the container.

6. The precooling unit according to any one of claims 1-4, characterized in that, The liquid nitrogen supply assembly includes: First transport pipeline; Multiple second conveying pipes correspond one-to-one with multiple gasification components, and the two ends of the second conveying pipes are respectively connected to the first conveying pipe and the corresponding gasification component; Multiple control valves are provided, each corresponding to one of the multiple second delivery pipelines. The control valves are located on the corresponding second delivery pipelines and are used to control the opening and closing of the delivery pipelines.

7. The precooling unit according to claim 6, characterized in that, The precooling unit also includes: A first controller is electrically connected to the control valve; A temperature sensor is located inside the storage cavity and is electrically connected to the first controller.

8. The precooling unit according to any one of claims 1-4, characterized in that, The exhaust assembly includes one or more circulating fans; When there are multiple circulating fans, the multiple circulating fans are arranged at intervals along the height direction of the housing.

9. The precooling unit according to any one of claims 1-4, characterized in that, The precooling unit also includes: Second controller; An exhaust valve is connected to the containment box and electrically connected to the second controller; A pressure sensor is located inside the housing and is electrically connected to the second controller.

10. The precooling unit according to any one of claims 1-4, characterized in that, The container includes: First box; The second enclosure is located inside the first enclosure; A thermal insulation component is disposed between the first housing and the second housing.

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