A preservation box for cold-chain logistics transportation

Abstract

This application discloses a cold chain logistics transport container, which includes a storage box inside. The side wall of the storage box extends downwards beyond the second bottom plate to form an annular support leg, which is sealed and fixed to the bottom plate of the container. An annular cavity is formed between the side walls of the container and the storage box, and a cold air cavity is formed between the bottom plates of the container and the storage box. Ventilation holes are provided on the bottom plate of the storage box. Several steel cylinders are arranged in the annular cavity, and ice packs are placed between adjacent steel cylinders. Each steel cylinder is equipped with a helical compression spring and a piston, and a one-way valve is installed in the piston. The top surfaces of the storage box and the steel cylinders are lower than the top surface of the container. When the container bounces during transportation, the piston bounces and sends the cold air from the steel cylinders into the storage box, causing air circulation inside the storage box. This prevents heat accumulation in the fresh food in the middle of the storage box and maintains the quality of the fresh food.

Description

Technical Field

[0001] This utility model relates to a storage box for cold chain logistics transportation. Background Technology

[0002] Cold chain storage boxes are used to store fresh foods such as vegetables and fruits during transportation. To maintain a low-temperature environment, ice packs are usually used as a cold source. To prevent the ice packs from scratching or freezing the fresh foods, a layer is usually installed around the storage box, with the ice packs inside. While this design effectively prevents scratches or freezing of the fresh foods, it also results in the air inside the storage box being relatively stagnant and unable to circulate. This not only hinders the rapid drop in temperature inside the storage box but also causes the food in the middle of the storage box to be relatively warmer. In addition, fresh foods such as vegetables and fruits generate heat during storage due to respiration, which exacerbates the temperature rise in the middle area of ​​the storage box, causing the fresh foods in this area to spoil due to high temperatures and affecting their quality. Utility Model Content

[0003] To improve the temperature uniformity inside the storage box and prevent the spoilage of fresh food due to excessively high local temperatures, this application proposes a storage box for cold chain logistics transportation, which includes a box body and a box lid hinged to the top of the box body. A storage box is provided inside the box body. The storage box includes a second side wall and a second bottom plate installed at the bottom of the second side wall. The second side wall extends downward and beyond the second bottom plate to form an annular support leg. The support leg is sealed and fixed to the first bottom plate of the box body. An annular cavity is formed between the first side wall of the box body and the second side wall of the storage box. A cold air cavity is formed between the first bottom plate of the box body and the second bottom plate of the storage box. A vent is provided on the second bottom plate of the storage box, and the vent connects the cold air cavity and the inner cavity of the storage box.

[0004] Along the circumferential direction of the annular cavity, several spaced steel cylinders are arranged inside the annular cavity. The steel cylinders extend vertically, with their lower ends connected to the cold air chamber and their upper ends connected to the upper part of the inner cavity of the storage box. Each steel cylinder is equipped with a helical compression spring and a piston. The piston is located above the helical compression spring and is in clearance fit with the inner wall of the steel cylinder. A one-way valve is installed inside the piston. When the piston moves downward, the one-way valve closes, and when the piston moves upward, the one-way valve opens.

[0005] The space between adjacent steel cylinders forms a refrigerant chamber, and ice packs are placed inside the refrigerant chamber; the top surfaces of both the storage box and the steel cylinders are lower than the top surface of the main body. To improve heat exchange efficiency, the storage box is preferably made of metal sheet, specifically stainless steel, aluminum, copper, or other alloy metal sheets.

[0006] When the storage box described in this application is in use, fresh food is first placed inside the box, then ice packs are placed in the refrigerant chamber, and finally the lid is closed and locked to the box body. During transportation, if the storage box bounces, the piston will bounce and, under the return of the compressed helical spring, bounce multiple times, allowing the piston to move vertically within the steel cylinder. When the piston moves downwards, the one-way valve closes, sending the cold air from the steel cylinder through the cold air chamber into the storage box, thus circulating the air within the box and preventing heat buildup in the fresh food in the middle of the box, maintaining the quality of the fresh food. When the one-way valve moves upwards, the central ball of the one-way valve presses against the central ring, opening the valve orifice and allowing air to flow between the upper and lower ends of the piston.

[0007] Furthermore, in order to allow the condensate generated in the annular cavity to converge and be discharged from the same point, there is a gap between the lower end of the steel cylinder and the first base plate, and adjacent refrigerant cavities are connected through this gap.

[0008] Furthermore, to facilitate the discharge of condensate in the annular cavity, the bottom surface of the annular cavity is inclined, and a water collection tank is set at the lowest point of the annular cavity. The drain pipe passes through the box from the outside to the inside and extends into the water collection tank, and a drain valve is installed at the outer end of the drain pipe.

[0009] Furthermore, to facilitate the connection between the steel cylinder and the cold air chamber, an end plate is sealed at the bottom of the steel cylinder. One end of the air guide pipe passes through the end plate in a sealed manner and connects to the inner cavity of the steel cylinder. The other end of the air guide pipe passes through the support leg in a sealed manner and connects to the cold air chamber.

[0010] Specifically, the one-way valve includes a valve hole disposed in the piston, the valve hole extending vertically and penetrating the upper and lower ends of the piston, a hollow external thread nut screwed on the upper end of the valve hole, and a central ring disposed at the lower end of the valve hole, the central ring being connected to the inner wall of the valve hole via fins, an airflow channel being formed between adjacent fins, and a central ball being placed in the valve hole and located between the hollow external thread nut and the central ring;

[0011] The outer diameter of the central ball is larger than the inner diameter of the hollow external thread nut and the inner diameter of the central ring, but smaller than the inner diameter of the valve hole. Under external force, the central ball can move upward and abut against the hollow external thread nut to seal the inner hole of the nut. After the external force is removed, under the action of gravity, the central ball can move downward and abut against the central ring. When the central ball abuts against the central ring, viewed vertically, the central ball can at most cover only part of the airflow channel. The central ball is preferably made of a hollow ball or a lightweight material, such as a hollow plastic ball or a hollow rubber ball.

[0012] The one-way valve does not have an elastic element for pressing the central ball against the hollow external thread nut. Therefore, even when the storage box is in a stable state, the one-way valve is open. The denser cold air in the steel cylinder can flow downwards and enter the storage box through the cold air chamber to cool the fresh food in the storage box. When the piston moves up and down due to shaking of the storage box, it can accelerate the speed at which the cold air in the steel cylinder enters the storage box.

[0013] Furthermore, to prevent the helical compression spring from jumping, the lower end of the helical compression spring is fixed to the steel cylinder.

[0014] Furthermore, to prevent the piston from exceeding the top surface of the steel cylinder and colliding with the cover when moving upward, thus causing damage to the cover, a hollow external thread limiting component is screwed onto the top of the steel cylinder.

[0015] Specifically, to facilitate the screwing of the hollow external thread limiting component, the inner cavity of the hollow external thread limiting component is a regular polygon. This design allows the hollow external thread limiting component to be completely screwed into the steel cylinder, preventing the hollow external thread limiting component from extending upwards beyond the steel cylinder and causing inconvenience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of this application.

[0017] Figure 2 yes Figure 1 A view from the center AA direction.

[0018] Figure 3 This is a schematic diagram of the piston and one-way valve.

[0019] Figure 4 yes Figure 3 A view from the center (BB direction). Detailed Implementation

[0020] Please see Figure 1 and Figure 2 A cold chain logistics transport storage box includes a box body 11 and a box cover 41 hinged to the top of the box body 11. A latch 42 is installed at the end of the box cover away from the hinge. A lock lug 43 matching the latch is installed on the top of the box body. The lock lug 43 is specifically installed on the top of the first side wall 111 described below.

[0021] A storage box 12 is provided inside the box body. The box body 11 includes a first side wall 111 extending vertically and a first bottom plate 112 sealed at the bottom of the first side wall. The storage box 12 includes a second side wall 121 extending vertically and a second bottom plate 122 installed at the bottom of the second side wall. The second side wall 121 extends downward and beyond the second bottom plate 122 to form an annular support leg 124. The support leg is sealed and fixed to the first bottom plate 112 of the box body. An annular cavity is formed between the first side wall of the box body and the second side wall of the storage box. A cold air cavity 16 is formed between the first bottom plate of the box body and the second bottom plate of the storage box. A vent hole 123 is provided on the second bottom plate of the storage box. The vent hole 123 connects the cold air cavity and the inner cavity of the storage box.

[0022] Along the circumferential direction of the annular cavity, several spaced-apart steel cylinders 21 are arranged within the annular cavity. These steel cylinders are made of seamless steel tubing and extend vertically. The lower end of each steel cylinder connects to the cooling air chamber 16, and the upper end connects to the upper part of the storage box's inner cavity. Each steel cylinder contains a helical compression spring 22 and a piston 50, positioned above the helical compression spring. The piston is in clearance fit with the inner wall of the steel cylinder. A one-way valve 500 is installed within the piston; it closes when the piston moves downwards and opens when the piston moves upwards. The top surfaces of both the storage box and the steel cylinders are lower than the top surface of the box body, allowing the upper end of the steel cylinder to communicate with the inner cavity of the storage box.

[0023] Please see Figure 3 and Figure 4 In this embodiment, the one-way valve 500 includes a valve hole 51 disposed in the piston 50. The valve hole 51 extends vertically and passes through the upper and lower ends of the piston. A hollow external thread nut 54 is screwed on the upper end of the valve hole. A central ring 52 is disposed at the lower end of the valve hole. The central ring 52 is connected to the inner wall of the valve hole 51 via fins 53. An airflow channel 57 is formed between adjacent fins. A central ball 56 is placed in the valve hole and located between the hollow external thread nut and the central ring.

[0024] The outer diameter of the central ball is larger than the inner diameter of the hollow external thread nut and the inner diameter of the central ring, but smaller than the inner diameter of the valve hole. Under the action of external force, the central ball can move upward and abut against the hollow external thread nut to seal the inner hole 541 of the hollow external thread nut. After the external force is removed, under the action of gravity, the central ball can move downward and abut against the central ring 52. When the central ball abuts against the central ring, viewed vertically, the central ball can at most cover only part of the airflow channel 57, allowing the air at both ends of the piston to communicate. To reduce the weight of the central ball, in this embodiment, the central ball is a PVC hollow ball. It is understood that in other embodiments, a rubber hollow ball or a metal hollow ball can also be used.

[0025] The space between adjacent steel cylinders forms a refrigerant chamber 13, and ice packs are placed inside the refrigerant chamber (not shown in the attached diagram). The box body and lid in this embodiment are manufactured using existing mature technologies, and will not be described in detail further. The storage box is made of stainless steel plate.

[0026] In this embodiment, there is a gap 212 between the lower end of the steel cylinder 21 and the first base plate, and the adjacent refrigerant chamber 13 is connected through this gap. The bottom surface of the annular cavity is inclined, and a water collection tank 31 is provided at the lowest point of the annular cavity. The drain pipe 32 passes through the box from the outside to the inside and extends into the water collection tank, and a drain valve 33 is installed at the outer end of the drain pipe. Figure 1 The direction of the middle arrow X indicates the downward tilt of the bottom surface of the annular cavity.

[0027] An end plate 25 is sealed at the bottom of the steel cylinder 21. One end of the air guide pipe 26 is sealed through the end plate and connects to the inner cavity of the steel cylinder, while the other end of the air guide pipe is sealed through the support leg and connects to the cold air chamber. To prevent the helical compression spring from jumping, the helical compression spring is fixed to the end plate 25, that is, the lower end of the helical compression spring is fixed to the steel cylinder.

[0028] To prevent the piston from impacting the cylinder cover by extending upwards from the steel cylinder during its movement, an internal thread is provided on the inner wall of the top of the steel cylinder, and a hollow external thread limiting member 24 is screwed onto this internal thread. In this embodiment, the hollow external thread limiting member 24 is cylindrical, and its inner cavity is a regular hexagon, so as to facilitate screwing it onto the steel cylinder with a regular hexagonal wrench. It can be understood that in other embodiments, the inner cavity of the hollow external thread limiting member 24 may also be an equilateral triangle, a square, or other regular polygons.

[0029] In this embodiment, fresh food is first placed in the storage box, then ice packs are placed in the refrigerant chamber, and finally the lid is closed, using the latch and locking lug to lock the lid onto the box body. When the storage box bounces during transport, the piston bounces and, under the return of the compressed helical spring, bounces multiple times, allowing the piston to move vertically within the steel cylinder. When the piston moves downwards, the center ball of the one-way valve presses against the hollow external thread nut, closing the one-way valve and allowing cold air from the steel cylinder to be sent into the storage box through the cold air chamber, thus circulating the air within the storage box and preventing heat buildup from the fresh food in the middle of the storage box. When the one-way valve moves upwards, the center ball of the one-way valve presses against the center ring, opening the one-way valve and allowing air to flow between the upper and lower ends of the piston.

Claims

1. A cold chain logistics transport preservation box, characterized in that, The device includes a box body and a lid hinged to the top of the box body. A storage box is provided inside the box body. The storage box includes a second side wall and a second bottom plate installed at the bottom of the second side wall. The second side wall extends downward and beyond the second bottom plate to form an annular support leg. The support leg is sealed and fixed to the first bottom plate of the box body. An annular cavity is formed between the first side wall of the box body and the second side wall of the storage box. A cold air cavity is formed between the first bottom plate of the box body and the second bottom plate of the storage box. A vent is provided on the second bottom plate of the storage box, and the vent connects the cold air cavity and the inner cavity of the storage box. Along the circumferential direction of the annular cavity, several spaced steel cylinders are arranged inside the annular cavity. The steel cylinders extend vertically, with their lower ends connected to the cold air chamber and their upper ends connected to the upper part of the inner cavity of the storage box. Each steel cylinder is equipped with a helical compression spring and a piston. The piston is located above the helical compression spring and is in clearance fit with the inner wall of the steel cylinder. A one-way valve is installed inside the piston. When the piston moves downward, the one-way valve closes, and when the piston moves upward, the one-way valve opens. The space between adjacent steel cylinders forms a refrigerant chamber, and ice packs are placed inside the refrigerant chamber; the top surfaces of both the storage box and the steel cylinders are lower than the top surface of the box body.

2. The cold chain logistics transport preservation box according to claim 1, characterized in that, There is a gap between the lower end of the steel cylinder and the first base plate, and the adjacent refrigerant chambers are connected through this gap.

3. The cold chain logistics transport preservation box according to claim 2, characterized in that, The bottom of the annular cavity is inclined, and a water collection tank is set at the lowest point of the annular cavity. The drain pipe passes through the box from the outside to the inside and extends into the water collection tank. A drain valve is installed at the outer end of the drain pipe.

4. The cold chain logistics transport preservation box according to claim 1, characterized in that, An end plate is sealed at the bottom of the steel cylinder. One end of the air guide pipe passes through the end plate and connects to the inner cavity of the steel cylinder, while the other end of the air guide pipe passes through the support leg and connects to the cold air chamber.

5. The cold chain logistics transport preservation box according to claim 1, characterized in that, The one-way valve includes a valve hole located inside the piston, which extends vertically and passes through both ends of the piston. A hollow external thread nut is screwed onto the upper end of the valve hole, and a central ring is located at the lower end of the valve hole. The central ring is connected to the inner wall of the valve hole via fins, and an airflow channel is formed between adjacent fins. A central ball is placed inside the valve hole and located between the hollow external thread nut and the central ring. The outer diameter of the central ball is larger than the inner diameter of the hollow external thread nut and the inner diameter of the central ring, but smaller than the inner diameter of the valve hole. Under the action of external force, the central ball can move upward and abut against the hollow external thread nut to seal the inner hole of the hollow external thread nut. After the external force is removed, under the action of gravity, the central ball can move downward and abut against the central ring. When the central ball abuts against the central ring, when viewed vertically, the central ball can at most cover only part of the airflow channel.

6. The cold chain logistics transport preservation box according to claim 1, characterized in that, The lower end of the helical compression spring is fixed to the steel cylinder.

7. The cold chain logistics transport preservation box according to claim 1, characterized in that, A hollow external threaded limiter is screwed onto the top of the steel cylinder.

8. The cold chain logistics transport preservation box according to claim 7, characterized in that, The inner cavity of the hollow external thread limiter is a regular polygon.

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