Movable phase change cold storage device for refrigerated container

Abstract

The utility model relates to the technical field of refrigerated containers, and discloses a movable phase change cold storage device for a refrigerated container, which comprises a fixed frame and a plurality of box bodies arranged on the fixed frame, the plurality of box bodies are at least divided into one group; the plurality of box bodies in each group are communicated through a connecting pipe and form at least one inlet and at least one outlet which are respectively used for filling and discharging the phase change medium into and out of the box bodies before the refrigerated container is transported; the box body is of a telescopic structure and is used for automatically stretching out and drawing back to conduct volume change matched with phase change of a phase change medium when the phase change medium is subjected to phase change under the cooling effect of a refrigeration system of the refrigerated container and / or goods in the refrigerated container. A conventional mode that goods need to be precooled outside the refrigerated container is changed, the phase change cold storage technology is reasonably fused into the refrigerated container through the device, the functions of goods precooling and cold chain transportation are directly carried out in the refrigerated container, goods transfer is not needed, and the total refrigeration cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerated containers, in particular to a movable phase-change cold storage device for refrigerated containers. Background Art

[0002] In the field of cold chain transportation, a refrigerated container is a special container with good thermal insulation function and the ability to maintain a certain low temperature requirement. It is suitable for the transportation and storage of various types of perishable foods. Generally, long-term and long-distance refrigerated transportation is required.

[0003] Based on factors such as the limited space of refrigerated containers, the power consumption of refrigeration systems, and the cost of transportation refrigeration, existing refrigerated containers have strict requirements on the temperature of goods when loading. The goods need to be pre-cooled outside the box in advance, and then loaded into refrigerated containers for cold chain transportation after reaching the storage temperature of the goods. This is because the refrigeration system of refrigerated containers has limited power and insufficient refrigeration capacity. The container refrigeration power required for the goods to maintain a certain low temperature for a long time in cold chain transportation and storage is low, while the total refrigeration capacity required for the goods to be cooled from room temperature to storage low temperature is large, so the cooling time is long. If the cooling time is reduced by increasing the refrigeration power, the number and weight of equipment required for the container refrigeration system will increase, and the occupied space will increase while the equipment cost will also increase accordingly; in addition, the refrigeration power required for the container in the process of cold chain transportation and storage of goods is much lower than the refrigeration power required for the process of cooling from room temperature, so the power increased to reduce the cooling time is not effectively used when the goods are stored in the cold chain transportation, and the equipment increased due to the increase in power increases the overall weight of the container during transportation, and increases the energy consumption during transportation. Therefore, the method of increasing the refrigeration power has higher manufacturing and transportation costs, which is not conducive to the use of containers, and this method is not usually chosen. For this reason, the goods are usually pre-cooled before loading, but this method requires pre-cooling facilities independent of the refrigerated container and also increases the number of cargo transshipments.

[0004] With the advancement of science and technology, the application of phase change cold storage in refrigerated containers or cold storage has also received more and more attention. Phase change cold storage is the process of storing and releasing cold during the phase transition of substances, which uses the property that substances require higher heat when changing from solid, liquid, to gas. By utilizing the characteristics of phase change materials that absorb and release large amounts of heat when the temperature changes, the operating time of refrigeration equipment can be reduced, the operating power consumption of refrigeration equipment can be reduced, the refrigeration cost can be reduced, and the economic benefits can be improved. Currently, in the field of cold chain transportation, phase change materials are usually made into container walls or stored in dedicated spaces as a permanent part of the refrigeration system to play a role in phase change cold storage. The phase change materials used are formulated organic or inorganic materials, which usually have harmful properties such as micro-toxicity and flammability, and the material life cycle is limited. Utility Model Content

[0005] The utility model aims to provide a movable phase-change cold storage device for a refrigerated container, so as to solve the technical problem that the existing refrigerated container cannot take into account both the pre-cooling and storage functions.

[0006] The basic scheme provided by the utility model is: a movable phase-change cold storage device for a refrigerated container, comprising a fixing frame and a plurality of boxes installed on the fixing frame; the plurality of boxes are divided into at least one group; the plurality of boxes in each group are connected by a connecting pipe, and form at least one inlet and at least one outlet; the inlet and the outlet are respectively used for the refrigerated container to fill the phase-change medium into and out of the box before the transportation of goods; the box adopts a retractable structure, and is used for the box to automatically retract and expand to perform a volume change adapted to the phase change of the phase-change medium when the phase-change medium undergoes a phase change under the action of the refrigeration system of the refrigerated container and / or the heat dissipation of the goods in the refrigerated container.

[0007] The working principle and advantages of the utility model are as follows: before the transportation of the refrigerated container, the phase change medium is filled in multiple boxes through the inlet of the movable phase change cold storage device of the scheme, and under the action of the refrigeration system of the refrigerated container, the phase change medium undergoes a phase change to store cold. After reaching the preset phase change requirement, the goods that do not meet the low temperature requirements of conventional transportation are loaded into the refrigerated container, and the goods are pre-cooled through the refrigeration of the refrigerated container refrigeration system and / or the heat absorption of the phase change medium. When the goods meet the pre-cooling requirement, that is, the low temperature required for transportation, the cold amount of the phase change medium is released and the phase change occurs. The phase change medium in the box is discharged through the outlet to reduce the transportation weight; then the refrigerated container carries out cold chain transportation of the goods, and under the action of the refrigeration system of the refrigerated container, the goods are kept at a low temperature for long-term transportation and storage.

[0008] Compared with the existing technology, it breaks through the technical difficulty that the existing refrigerated container refrigeration cannot take into account the pre-cooling and storage functions, and changes the conventional way that the goods need to be pre-cooled outside the refrigerated container. Through this device, the phase change cold storage technology is reasonably integrated into the refrigerated container, which can achieve the effect of increasing the refrigeration power at low cost and without adding refrigeration equipment, and realize the function of directly pre-cooling and cold chain transportation of goods in the refrigerated container. No additional independent pre-cooling facilities and pre-cooling space are required, and no cargo transfer is required, which reduces the overall refrigeration cost; in addition, the phase change medium is filled into the box, and the refrigeration system of the refrigerated container is combined during the cooling process of the goods to realize the supplement of refrigeration power consumption and quickly complete the cooling of the goods. No additional refrigeration equipment and space for increasing power are required. At the same time, after the cooling and pre-cooling of the goods are completed and before the cold chain transportation, the phase change medium is discharged from the box, which reduces the total weight of the refrigerated container transportation process and reduces the overall power consumption of transportation; at the same time, the setting of the retractable structure of the box is used to make the change of the box volume compatible with the phase change of the phase change medium, which can reduce the volume of the box when it is not used, thereby reducing the overall space occupied by the device and improving the economy of cold chain transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of a movable phase-change cold storage device for a refrigerated container provided in an embodiment of the utility model;

[0010] Figure 2 The box structure provided by the embodiment of the utility model is schematically shown Figure 1 ;

[0011] Figure 3 The box structure provided by the embodiment of the utility model is schematically shown Figure 2 . DETAILED DESCRIPTION

[0012] The following is a further detailed description through specific implementation methods:

[0013] The symbols in the drawings of the specification include: refrigerated container 1, fixed frame 2, fixed beam 21, reinforcing rod 22, chassis 23, box body 3, corrugated section 31, plane section 32, lifting lug 33, quick-connect connection 34, connecting pipe 4, upper stop valve 41, lower stop valve 42.

[0014] The embodiment is basically as shown in the attached Figure 1 As shown: a movable phase change cold storage device for a refrigerated container 1, comprising a fixing frame 2 and a plurality of boxes 3 mounted on the fixing frame 2, which are placed in the refrigerated container 1 for use as a whole; the box 3 has an inner cavity space for containing a phase change medium, and under the action of the refrigeration system of the refrigerated container 1 and / or the heat dissipation of the goods in the refrigerated container 1, the phase change medium undergoes a phase change, thereby forming an environmental space in the refrigerated container 1 for cooling the goods from normal temperature to storing low temperature. In this embodiment, the phase change medium is water, and the phase change is from liquid to solid, from solid to liquid, that is, water to ice, and ice to water.

[0015] The size and material selection of the fixed frame 2 are comprehensively considered with factors such as the size of the refrigerated container 1, the size of the box body 3 and the overall weight after loading the phase change medium, so that it can stably carry the empty box body 3 and the box body 3 after loading the phase change medium. In this embodiment, the fixed frame 2 includes a number of beams and a reinforcing rod 22, which is used to connect and fix the beams; the fixed frame 2 also includes a chassis 23 with moving wheels; the fixed frame 2 and the box body 3 can be moved by the moving wheels, and the moving wheels have a self-locking fixing structure, which can be locked after positioning to avoid displacement, and the self-locking fixing structure can be realized by existing technology. The beams, reinforcing rods 22, and chassis 23 are connected to form a stable frame structure. In other embodiments, other components can also be set to improve the stability of the fixed frame 2. In this example, the length of the fixed frame 2 is slightly smaller than the length of the refrigerated box, and is placed on the walls on both sides of the container to ensure that the center of gravity of the container does not shift. The height of the bracket is slightly lower than the allowable height of the cargo filling in the container, and the height difference is controlled within the range of 50-100mm, which does not affect the flow of the air duct in the box. In this embodiment, the bracket height can be selected as 1750mm, which can adapt to the allowable height of the cargo filling in the conventional container. The thickness of the bracket is less than 150mm, which occupies less cargo space and can reserve a suitable placement space for the cargo, so that the space occupied by the fixed frame 2 and the cargo placement space are reasonably balanced. The cargo is placed in the middle of the container and isolated from the two side brackets by supporting items such as air bags to make the cargo position relatively fixed. The box 3 storing the phase change medium on both sides exchanges heat with the cargo in the middle through the internal air duct of the refrigerated container 1, so that the cargo is evenly cooled.

[0016] The plurality of boxes 3 are at least divided into one group; the plurality of boxes 3 in each group are connected by a connecting pipe 4, and form at least one inlet and at least one outlet; the inlet and outlet are both equipped with a stop valve. In this embodiment, the plurality of boxes 3 are arranged in an array, aligned up and down, such as Figure 1, 4 rows and 8 columns can be set, which are a group as a whole. The boxes 3 in the 1st and 4th rows are connected in the whole row by horizontal connecting pipes 4, and the boxes 3 in the 2nd and 3rd rows are connected in the whole column by vertical connecting pipes 4. They have one inlet and one outlet. The inlet is connected to the external water source (phase change medium storage place), and the outlet is connected to the drainage place (phase change medium discharge place). The inlet and outlet are switched by the stop valve to control the flow rate of the phase change medium filling into and out of the box 3. Such an arrangement can meet the situation of a conventional external water source interface and has strong versatility. In other embodiments, the number, layout and connection of the boxes 3 can be reasonably carried out according to actual needs, such as cooling capacity, cooling time, size of the refrigerated container 1, size of the box 3, etc. At the same time, if the external water source of the use site has multiple interfaces, and the drainage place can meet the simultaneous drainage of multiple outlets, multiple inlets and multiple outlets can also be arranged in groups, as long as the phase change medium can be quickly filled into the box 3 and flowed out of the box 3, and the structural complexity, cost and use site conditions can be balanced.

[0017] like Figure 2 and Figure 3 As shown, the box body 3 adopts a retractable structure, which is used for automatically retracting and performing a volume change that matches the phase change of the phase change medium when the phase change medium undergoes a phase change under the action of the refrigeration system of the refrigerated container 1 and / or the heat dissipation of the goods in the refrigerated container 1. The retractable structure is that at least one retractable corrugated section 31 is arranged on the box body 3. In this embodiment, the box body 3 adopts a rectangular structure, wherein the length is controlled within the range of 300-350mm, the width is controlled within the range of 120-150mm, and the height is controlled within the range of 400-450mm. There are two corrugated sections 31, and a plane section 32 is arranged below each corrugated section 31. The corrugations and the planes are arranged crosswise, and the whole box body 3 is formed in one piece. The corrugated section 31 is a V-shaped continuous structure, the V-shaped height is 40mm, and the concave and convex surface size is 20mm. The setting of the corrugated section 31 can automatically expand and contract when the phase change of the medium in the box causes a change in volume, which plays a role in preventing the water tank from bursting and collapsing. At the same time, the corrugated section 31 can also increase the contact area between the box body 3 and the air, and enhance the heat dissipation of the goods. The top of the box body 3 is provided with a lifting ear 33, which is used to fix the box body 3 on the beam through the lifting ear 33. At least one quick-connection port 34 is provided on the box body 3; the quick-connection port 34 is provided with a seal for connecting the box body 3 with the connecting pipe 4; the position of the plane node 32 of the quick-connection port 34 on the box body 3 is reasonably set according to the connection requirements with the adjacent box body 3, such as Figure 1 As shown, each row and the first and last two rows of each row are set specifically according to the connectivity requirements.

[0018] When the movable phase-change cold storage device of this scheme is used:

[0019] One is installed on each of the two opposite sides (non-door side) of the refrigerated container cargo box (no cargo is loaded at this time), the moving wheel is self-locking and stabilized in the appropriate position, the inlet (lower stop valve) is connected to the external water source, and water is injected into the box from low to high until all the boxes are filled with water, or when water is discharged from the outlet (upper stop valve), the upper stop valve and the lower stop valve are closed, and the refrigeration system of the refrigerated container is turned on until the water in all the boxes reaches below the freezing point. In this process, due to the phase change and volume change in the process of water to ice, the box is adaptively adjusted through the corrugated section until the water in all the boxes reaches below the freezing point, and a large amount of cold energy is preserved in the frozen (phase change) state; then the room temperature cargo is placed in the container. Alternatively, goods with a certain amount of heat can be directly loaded into a refrigerated container, which is located between two movable phase-change cold storage devices. The box releases its coldness while the refrigeration system turns on the refrigeration, which can quickly cool the goods to storage low temperature. At this time, the ice phase changes into water due to the absorption of heat from the goods. Before the goods are transported, the water can be discharged from the container in time through the drain valve, which reduces the weight of the goods during transportation and reduces the power consumption of the refrigerated container. In addition, the entire device can be moved out of the container before transportation, and the box, connecting pipes and other components can be flexibly replaced, as well as the overall size of the device can be flexibly adjusted. In order to reduce scale or debris inside the box, the water entering the box can be purified to reduce impurities.

[0020] The movable phase change cold storage device for refrigerated containers provided in this embodiment uses water as the phase change medium, which is pollution-free to the environment and is common in life. It can be taken and discharged at any time, making the device more versatile, more applicable, and more energy-saving and environmentally friendly. In addition, it should be emphasized that compared with water storage, the volume required for ice storage to store the same amount of cold will be much smaller than the volume required for water storage. Therefore, this scheme adopts ice storage, and the ice storage system mainly uses the phase change latent heat of water and ice (334.4kJ / kg) for cold storage and cold release. Ice storage is a way of making water into ice, and using the phase change latent heat of ice to store cold. Compared with water storage, the volume required for ice storage to store the same amount of cold will be much smaller than the volume required for water storage, so the space advantage of this device can be reflected. Through calculation, the pre-cooling of goods in the refrigerated container by the device and the refrigeration system can be reduced from about 8 days to about 2 days compared with the pre-cooling of the refrigeration system alone, which greatly reduces the cooling time.

[0021] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A movable phase-change cold storage device for a refrigerated container, characterized in that: It comprises a fixing frame and a plurality of boxes mounted on the fixing frame; the plurality of boxes are divided into at least one group; the plurality of boxes in each group are connected by a connecting pipe to form at least one inlet and at least one outlet; the inlet and the outlet are respectively used for the refrigerated container to fill the phase change medium into and out of the box before the cargo is transported; the box adopts a retractable structure, and is used for the box to automatically retract and expand to perform a volume change adapted to the phase change of the phase change medium when the phase change medium undergoes a phase change under the action of the refrigeration system of the refrigerated container and / or the heat dissipation of the cargo in the refrigerated container.

2. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The phase change medium is water.

3. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The retractable structure is that at least one retractable bellows section is arranged on the box body.

4. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The boxes are arranged in a matrix.

5. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The fixing frame comprises a chassis on which moving wheels are installed; the moving wheels are provided with a self-locking fixing structure.

6. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The fixing frame comprises a plurality of cross beams; the top of the box body is provided with hanging ears for fixing the box body on the cross beams.

7. The movable phase-change cold storage device for a refrigerated container according to claim 6, characterized in that: The fixing frame is also provided with a reinforcing rod; the reinforcing rod is used to connect and fix a plurality of cross beams.

8. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The inlet and the outlet are both equipped with stop valves.

9. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: At least one quick-connection port is provided on the box body; and a sealing member is provided on the quick-connection port.

10. The movable phase-change cold storage device for a refrigerated container according to claim 1, characterized in that: The box body adopts a rectangular parallelepiped structure, wherein the length is controlled within the range of 300-350 mm, the width is controlled within the range of 120-150 mm, and the height is controlled within the range of 400-450 mm.

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