A cold insulation tank using a VIP

Abstract

The application provides a cold preservation box adopting VIP, which comprises a box body spliced by front, rear, left and right plates and a bottom plate, the front, rear, left and right plates respectively comprise an inner protective layer, a VIP and a PU layer which are sequentially laminated; the inner protective layer and the VIP are uniformly and alignedly distributed in length and width, the PU layer is only distributed on the outer side of the VIP, the bottom end of the PU layer is alignedly distributed with the bottom end of the VIP, the left and right edges and the top edge of the PU layer extend outward relative to the VIP by a preset distance to form a stepped portion; the bottom plate comprises a VIP, a PU layer covering the bottom surface and the peripheral side surface of the VIP, and a protective layer covering only the top surface of the VIP; the stepped portions on the left and right sides of the front plate are respectively engaged with the stepped portions on the front sides of the left and right plates; the stepped portions on the left and right sides of the rear plate are respectively engaged with the stepped portions on the rear sides of the left and right plates; the bottom edge of a rectangular frame is arranged on the bottom plate, and the peripheral outer side surfaces of the rectangular frame are respectively aligned with the peripheral outer side surfaces of the bottom plate.

Description

Technical Field

[0001] This invention relates to a cold storage box made of PU material and vacuum insulation board. Background Technology

[0002] Most existing cold storage boxes are made by splicing together multiple insulation panels, in which the insulation panels are made by completely covering the vacuum insulation panel with foam material.

[0003] The foaming material is generally expanded polystyrene (EPS) foam or rigid polyurethane foam, etc.

[0004] EPS is a lightweight polymer. It is made by adding a foaming agent to polystyrene resin and heating it to soften it. The foaming agent generates gas, forming a rigid, closed-cell foam plastic. Its processing methods can be divided into molding and extrusion methods depending on the foaming process. The thermal conductivity of polystyrene is 0.116 W / (m·K) at 30°C.

[0005] Polyurethane foam (PU) is a high-molecular polymer made primarily from isocyanate and polyether, mixed with foaming agents, catalysts, flame retardants, and other additives using specialized equipment, and then foamed on-site through high-pressure spraying. Polyurethane foam comes in two types: flexible and rigid. Flexible foam has an open-cell structure, while rigid foam has a closed-cell structure. Rigid polyurethane foam is mainly used in building exterior wall insulation, integrated roof waterproofing and insulation, cold storage insulation, pipe insulation materials, building panels, and refrigerated truck and cold storage insulation materials.

[0006] Vacuum insulation panels (VIPs) typically have a thermal conductivity of less than 0.003 W / (m·K) at 30°C. Under the same conditions, the thermal conductivity of polyurethane (PU) is generally an order of magnitude higher than that of VIPs.

[0007] VIP (Vacuum Insulation Board) products are generally flat, but can also be made into curved panels. VIPs include a membrane bag used for vacuum-sealing the core material, but the membrane bag is not wear-resistant or impact-resistant; once the membrane bag is damaged and leaks air, the VIP fails, and the thermal conductivity of the failed VIP will increase significantly. Therefore, it is necessary to cover one or more sides of the VIP with a layer of foamed material to protect it. The corresponding insulation board is called PU-VIP, and PU-VIP is used to make cold storage boxes.

[0008] In existing cold boxes made of PU-VIP, there are two layers of polyurethane foam (i.e., PU layer) at the joint of two adjacent PU-VIP pieces. The electrothermal coefficient of the PU layer is an order of magnitude higher than that of the VIP, which weakens the overall insulation performance of the cold box. How to further leverage the advantages of VIP to significantly improve the cold insulation effect is a technical problem to be solved in this field. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a cold box with a simple structure and improved cold preservation effect, so as to further give full play to the insulation advantages of VIP.

[0010] To address the aforementioned problems, this invention provides a cooler box comprising: a box body assembled from front, rear, left, right panels and a bottom panel; the front, rear, left, and right panels each comprising a first inner protective layer, a first VIP, and a first PU layer stacked sequentially; the first inner protective layer has the same length and width as the first VIP and is aligned accordingly; the first PU layer is distributed only on the outer side of the first VIP, with its bottom edge aligned with the bottom edge of the first VIP; the left, right, and top edges of the first PU layer extend outwards by a predetermined distance relative to the first VIP to form a stepped portion with the side of the VIP; the bottom panel comprises: a second VIP, a second PU layer covering the bottom surface and surrounding sides of the second VIP, and a layer covering only the outer side of the first VIP. The protective layer on the top surface of the second VIP; the first and second PU layers have the same thickness, and the preset distance is the thickness of the first PU layer; the front, rear, left, and right panels form a rectangular frame, and the steps on the left and right sides of the front panel overlap with the steps on the front sides of the left and right panels respectively; the steps on the left and right sides of the rear panel overlap with the steps on the rear sides of the left and right panels respectively; the bottom edge of the rectangular frame is located on the base plate, and the outer sides of the rectangular frame are aligned with the outer sides of the base plate respectively, so that the bottom outer edge of the first VIP in the front, rear, left, and right panels is aligned with the edges of the second VIP respectively, and the outer sides of each first VIP are aligned with the sides of the second VIP respectively.

[0011] The cold storage box further includes: a cover plate; the cover plate includes a third inner protective layer, a third VIP and a third PU layer stacked in sequence; the third inner protective layer and the third VIP have the same length and width and are aligned, and the four sides of the third PU layer extend outward by the preset distance relative to the third VIP to form a stepped portion with the side of the VIP.

[0012] As another embodiment of the cover plate, the cover plate includes a third inner protective layer, a third VIP, and a third PU layer stacked in sequence; the third inner protective layer and the third VIP have the same length and width and are aligned and distributed to form a central composite plate; the four sides of the central composite plate are covered with a 1-5mm thick PU protective layer that is integral with the third PU layer; the four sides of the third PU layer extend outward by a predetermined distance relative to the PU protective layer of the central composite plate to form a stepped portion.

[0013] The first, second, and third inner protective layers are hollow boards or wood-plastic composite boards.

[0014] Hollow sheets are generally made of environmentally friendly, pollution-free, and recyclable thermoplastic polypropylene (PP), polyethylene (HDPE) resin, and various auxiliary materials. Another type is polycarbonate (PC) hollow sheet, also known as sun sheet, glass Kapron sheet, or PC hollow sheet, which is made of high-performance engineering plastic PC resin and has the characteristics of high transparency, light weight, impact resistance, sound insulation, heat insulation, flame retardancy, and aging resistance.

[0015] The hollow board used in this invention includes: upper and lower layers and a partition parallel to the upper and lower layers; a through hole is formed between adjacent partitions; a further preferred embodiment is that the two ends of each through hole are sealed with foam material so that each through hole forms an air pocket, thereby improving impact resistance and thermal insulation performance.

[0016] The top surface of each VIP in the front, rear, left, and right panels is covered with a PU protective layer that is integral with the first PU layer.

[0017] The stepped portion on the inner side of the cover plate is adapted to mate with the stepped portion at the top opening of the rectangular frame, and when mates, the four edges of the third VIP are respectively located directly above the top surface of the front, rear, left, and right plates.

[0018] This invention has positive effects compared to the prior art:

[0019] (1) In the cold box provided by the present invention, the VIPs in the two adjacent overlapping side panels are directly overlapped, and there is no polyurethane foam layer (i.e., PU layer) in between, thereby avoiding the weakening of the overall heat preservation performance of the cold box. (2) In order to prevent direct friction between the two adjacent overlapping VIPs and affect the service life of the VIPs, a hollow board is set at the overlap of the two adjacent VIPs. (3) The two adjacent side panels are overlapped by the stepped part, so that there is no straight gap at the overlap, and the path of the gap from the inside to the outside is Z-shaped, which is conducive to blocking the internal and external passage of airflow at the gap and improving the heat preservation effect. (4) In the two horizontally adjacent panels in the front, back, left and right panels, or between the bottom edge of the front, back, left and right panels and the bottom plate, there is only one layer of hollow board between the corresponding two VIPs, and the two ends of each through hole on each hollow board are closed. Hollow core sheets offer superior impact resistance. While their thermal conductivity is roughly the same as that of PU layers, hollow core sheets facilitate rapid production, shortening the manufacturing cycle and eliminating the need to wait for the PU layer to foam. Furthermore, the dimensions and thickness of hollow core sheets are easily and precisely cut and controlled, ensuring dimensional consistency across batches. At the same thickness, hollow core sheets exhibit significantly higher mechanical strength than PU layers, enhancing the overall strength of the product. Attached Figure Description

[0020] To enable a clearer understanding of the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Figure 1-1 This is a schematic diagram of the inner surfaces of the front, rear, left, and right plates of the present invention;

[0022] Figure 1-2 This is a schematic diagram of the longitudinal cross-sectional structure of the front, rear, left, and right plates;

[0023] Figure 1-3 This is a schematic diagram of the transverse cross-sectional structure of the front, rear, left, and right plates;

[0024] Figure 2 This is a schematic diagram of the structure of the base plate;

[0025] Figure 2-1 This is a schematic diagram of the cross-sectional structure of the base plate;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the cold storage box of the present invention;

[0027] Figure 3-1 for Figure 3 A magnified view of part I in the middle;

[0028] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the cold storage box of the present invention;

[0029] Figure 4-1 for Figure 4 Enlarged view of section III in the middle;

[0030] Figure 4-2 for Figure 4 Enlarged view of section II in the middle;

[0031] Figure 5-1 This is a schematic diagram of the structure of the cover plate;

[0032] Figure 5-2 This is a schematic diagram of the cross-sectional structure of the cover plate. Detailed Implementation

[0033] Example

[0034] A cool box includes a box body 3 formed by splicing front, rear, left, and right panels 1 and a bottom panel 2. The front, rear, left, and right panels 1 respectively include a first inner protective layer 1-1, a first VIP 1-2, and a first PU layer 1-3 stacked in sequence. The length and width of the first inner protective layer are the same as those of the first VIP and are aligned. The first PU layer is only distributed on the outside of the first VIP. The bottom end of the first PU layer is aligned with the bottom end of the first VIP. The left, right, and top edges of the first PU layer extend outward by a predetermined distance relative to the first VIP to form a stepped portion 1-4 with the side of the first VIP 1-2.

[0035] The base plate 2 includes: a second VIP 2-1, a second PU layer 2-2 covering the bottom surface and four sides of the second VIP, and a protective layer 2-3 covering only the top surface of the second VIP; the first and second PU layers have the same thickness, and the preset distance is the thickness of the first PU layer; the front, rear, left and right plates form a rectangular frame, and the steps on the left and right sides of the front plate overlap with the steps on the front sides of the left and right plates, respectively.

[0036] The left and right step portions of the rear plate overlap and cooperate with the step portions on the rear sides of the left and right plates, respectively.

[0037] The bottom edge of the rectangular frame is located on the base plate. The outer sides of the rectangular frame are aligned with the outer sides of the base plate, so that the bottom outer edge of the first VIP in the front, rear, left, and right panels is aligned with the edges of the second VIP, and the outer side of each first VIP is aligned with the corresponding side of the second VIP. The rectangular frame and the base plate are connected with tape, and the seam is sealed with tape. The front, rear, left, and right panels 1 and the base plate 2 can be placed in a prefabricated canvas bag with straps, handles, etc., for easy handling.

[0038] The insulated box further includes: a cover plate 4; the cover plate 4 includes a third inner protective layer, a third VIP, and a third PU layer stacked sequentially; the third inner protective layer and the third VIP have the same length and width and are aligned, forming a central composite plate; the four sides of the central composite plate are covered with a 1-5mm thick PU protective layer integral with the third PU layer; the four sides of the third PU layer extend outward by a predetermined distance relative to the PU protective layer of the central composite plate to form a third step portion 4-1. The cover plate 4 can also be set in a prefabricated canvas cover, one side of which is integrally connected to the opening side of the canvas bag, and the remaining sides of the cover are sealed to the opening of the canvas bag by a sealing zipper.

[0039] The first, second, and third inner protective layers are hollow boards or wood-plastic composite boards. The hollow board includes upper and lower panels and partitions parallel to each other between the upper and lower panels; a through-hole is formed between adjacent partitions, and both ends of each through-hole are sealed with foam material to create air pockets, improving impact resistance and thermal insulation. The top surface of the front, rear, left, and right panels is covered with a PU protective layer integral with the first PU layer.

[0040] The third step portion 4-1 on the inner side of the cover plate is adapted to cooperate with the step portion at the top opening of the rectangular frame, and when cooperated, the four edges of the third VIP are respectively located directly above the top surface of the front, rear, left and right plates.

[0041] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A cold storage box comprising a box body assembled by front, rear, left, right and bottom plates, characterized in that: The front, rear, left and right plates respectively comprise first inner protective layer, first VIP and first PU layer which are stacked in sequence; The first inner protective layer and the first VIP are uniformly and alignedly distributed in length and width, the first PU layer is only distributed on the outer side of the first VIP, the bottom end of the first PU layer is alignedly distributed with the bottom end of the first VIP, and the left and right edges and the top edge of the first PU layer extend outward relative to the first VIP by a preset distance to form a stepped portion; The bottom plate comprises: a second VIP, a second PU layer covering the bottom surface and the peripheral side surface of the second VIP, and a second inner protective layer covering only the top surface of the second VIP; The thickness of the first PU layer and the second PU layer is consistent, and the preset distance is the thickness of the first PU layer; The front, rear, left and right plates form a rectangular frame, and the stepped portions on the left and right sides of the front plate are respectively engaged with the stepped portions on the front sides of the left and right plates; The stepped portions on the left and right sides of the rear plate are respectively engaged with the stepped portions on the rear sides of the left and right plates; The bottom edge of the rectangular frame is arranged on the bottom plate, and the peripheral outer side surfaces of the rectangular frame are respectively aligned with the peripheral outer side surfaces of the bottom plate, so that the bottom surfaces of the first VIPs of the front, rear, left and right plates are arranged on the second VIP, and the side surfaces of the first VIPs are respectively aligned with the corresponding side surfaces of the second VIP; The cold storage tank further comprises a cover plate; the cover plate comprises third inner protective layer, third VIP and third PU layer which are stacked in sequence; The top surfaces of the front, rear, left and right plates are covered with PU protective layer which is integrated with the first PU layer; The first inner protective layer, the second inner protective layer and the third inner protective layer are hollow plates; the hollow plates are PC hollow plates.

2. The cold storage tank according to claim 1, wherein: The third inner protective layer and the third VIP are uniformly and alignedly distributed in length and width, and the fourth edges of the third PU layer extend outward relative to the PU protective layer of the central composite plate by the preset distance to form a stepped portion.

3. The cold storage tank according to claim 1, wherein: The third inner protective layer and the third VIP are uniformly and alignedly distributed in length and width, and form a central composite plate; The peripheral side walls of the central composite plate are covered with PU protective layer which is integrated with the third PU layer and has a thickness of 1-5 mm; The fourth edges of the third PU layer extend outward relative to the PU protective layer of the central composite plate by the preset distance to form a stepped portion.

4. A cold store according to any one of claims 2-3, characterised in that The stepped portion on the inner side of the cover plate is adapted to cooperate with the stepped portion at the top opening of the rectangular frame, and when cooperating, the peripheral edges of the third VIP are respectively arranged directly above the top surfaces of the front, rear, left and right plates.

5. The cold plate of claim 2, wherein, The hollow plate comprises: upper and lower layer plates and a partition plate arranged in parallel between the upper and lower layer plates; a through hole is formed between adjacent partition plates, and both ends of each through hole are closed.

Images