Refrigerated truck and its insulation wall panels

Abstract

The present invention provides a refrigerated truck and its insulation wall panels. The insulation wall panels of the refrigerated truck include an outer wall panel, an inner wall panel, and an insulation layer sandwiched between the outer wall panel and the inner wall panel. The outer wall panel includes a plurality of flush and sequentially spliced ​​substrates, and the two side edges of each substrate are bent to form two flanges; the flanges between two adjacent substrates are snapped together through plastic deformation to form convex ribs, and the plurality of convex ribs are spaced along the length direction of the outer wall panel and all protrude toward the inner side of the outer wall panel to be embedded in the insulation layer. The outer wall panel is spliced ​​by snapping together a plurality of substrates in sequence through plastic deformation. Compared with the traditional splicing method of bonding, welding, and riveting, no other additional connectors are required, which reduces labor intensity and improves production efficiency. Moreover, the convex ribs are embedded in the insulation layer, which can play a role in reinforcing the insulation layer and can effectively prevent the stratification of the inner and outer wall panels and the insulation layer.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerator boxes, and in particular to a refrigerated truck and a heat-insulating wall plate thereof. Background Art

[0002] Refrigerated trucks are closed van trucks used to transport frozen goods and are an important link in cold chain logistics.

[0003] At present, the side panels and roof panels of refrigerated trucks are mainly made in the following ways: the first one is that the outer wall is made of a whole sheet of fiberglass (Fiber Reinforced Plastics, referred to as FRP), and the inner wall is made of fiber reinforced thermoplastic composite board (the main component is thermoplastic polymer). The side panels or roof panels made in this way can only be used for refrigerated trucks of general strength because the strength of FRP is not very high; therefore, for refrigerated trucks with higher use strength, it is necessary to increase the foaming density of the polyurethane insulation layer, or build-in reinforcing ribs in the polyurethane insulation layer. Both of the above methods will significantly increase the material cost and the weight of the vehicle body. At present, environmental protection requirements are getting higher and higher, and the production of FRP materials has serious environmental pollution; FRP also has a problem. FRP is a thermosetting material, which is not conducive to recycling and is less and less advocated.

[0004] The second method is to achieve the required strength, and the width of the side panels and top panels of the refrigerated truck is wider than that of general metal coils, which are usually made by splicing metal plates (aluminum plates or steel plates). The splicing methods mainly include: one is to use cold storage insulation panels to splice to form side panels or top panels. The cold storage panels have their own interfaces. When splicing, structural adhesive is applied to the interfaces, and then the panels are docked. A certain pressure is applied to wait for the glue to solidify. Since structural adhesive is required, there are strict requirements for the construction environment, surface treatment of materials, and pressure holding pressure. Otherwise, it is easy to cause poor bonding effect, cracking of the splicing seams during use, and then leakage, water seepage and other quality problems, which seriously affect the safety of vehicle transportation. Another way is to arrange small metal sheets in the length direction, splice them by welding or riveting, and then foam them to obtain the side panels or top panels of the refrigerated truck. However, the welds of the welded metal plates are prone to cracking and deformation, which affects the quality and appearance. At the same time, the rivet splicing requires close arrangement of rivets, which makes the appearance uneven and increases the weight of the plate.

[0005] Refrigerated trucks have high requirements for the appearance, sealing and strength of box panels. As vehicles for transporting goods, lightweight design is increasingly advocated. The above-mentioned box panels made of FRP sheets and metal plates bonded or welded together are difficult to meet the requirements. Summary of the invention

[0006] The object of the present invention is to provide a heat-insulating wall panel of a refrigerated truck, which realizes bite connection through plastic deformation of the base plate itself, so as to ensure the strength, rigidity and sealing of the connection.

[0007] The present invention also aims to provide a refrigerated vehicle.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A heat-insulating wall panel of a refrigerated truck comprises an outer wall panel, an inner wall panel and a heat-insulating layer sandwiched between the outer wall panel and the inner wall panel, wherein the outer wall panel comprises a plurality of base plates which are flush and sequentially spliced, and the two side edges of each base plate are respectively bent to form two flanges; the flanges between two adjacent base plates are engaged together by plastic deformation to form convex ribs, and the plurality of convex ribs are spaced apart along the length direction of the outer wall panel and all protrude toward the inner side of the outer wall panel to be embedded in the heat-insulating layer.

[0010] According to one embodiment of the present invention, the inner wall panel also includes a plurality of substrates spliced ​​side by side in sequence, and both side edges of each substrate are bent to form two flanges, and the flanges between two adjacent substrates are engaged by plastic deformation to form ribs; the plurality of ribs on the inner wall panel protrude toward the outer wall panel, and are staggered with the ribs on the outer wall panel; a foaming cavity is defined between any two adjacent ribs on the inner wall panel and two opposite ribs on the outer wall panel, and both ends of the foaming cavity have openings; the plurality of foaming cavities are connected in sequence through the openings for injection of foaming material, and the thermal insulation layer is formed.

[0011] According to one embodiment of the present invention, the two flanges of the substrate are respectively a first flange and a second flange; the first flange is a flange extending vertically from the substrate; the second flange includes a bite edge extending vertically from the substrate and another bite edge connected to the bite edge at an angle; the flange of one substrate extends between the two bite edges of the other substrate, and respectively bites with the two bite edges to form the convex rib.

[0012] According to one embodiment of the present invention, the flange and the biting edge are both recessed by stamping to form a biting section with an arc-shaped contour close to the substrate, and the end of the biting section extends away from the substrate to form a straight-line bonding section; the biting section of the flange and the biting sections of the two biting edges are correspondingly bitingly connected, and the bonding section of the flange is respectively bonded to the bonding sections of the two biting edges.

[0013] According to an embodiment of the present invention, the end portion where the fitting sections of the two engaging edges meet is in an arc shape; there is a gap between the end portion and the end portion of the fitting section of the flange to form a ring-shaped closed filling hole.

[0014] According to an embodiment of the present invention, a projection length of the engaging section on a projection plane perpendicular to the substrate is not less than a projection length of the bonding section.

[0015] According to an embodiment of the present invention, the cross-sectional shape of the engaging segment is wavy, V-shaped or arc-shaped.

[0016] According to an embodiment of the present invention, the outer wall panel further comprises a sealing strip arranged corresponding to the base plate; the sealing strip is extended along the flange of the base plate and is attached between the flange and an attachment section of the bite edge.

[0017] According to one embodiment of the present invention, the plurality of substrates include a plurality of first substrates and a plurality of second substrates that are alternately spliced ​​in sequence; the two flanges of the first substrate are both first flanges, and the first flange extends vertically from the first substrate; the two flanges of the second substrate are both second flanges, and the second flange includes a bite edge extending vertically from the second substrate and another bite edge connected to the bite edge at an angle; the first flange extends between the two bite edges, and respectively bites with the two bite edges to form the convex rib.

[0018] This embodiment provides a refrigerated truck, which includes a body and an insulation wall panel arranged on the body; the inner wall panel of the insulation wall panel is tightly attached to and covers the top and side walls of the body, and the outer wall panel wraps the inner wall panel from the outside.

[0019] It can be seen from the above technical solutions that the insulation wall panel of a refrigerated truck provided by the present invention has at least the following advantages and positive effects:

[0020] 1. The outer wall panel is provided with a plurality of protruding ribs at intervals along the length direction. The ribs are embedded in the insulation layer to reinforce the insulation layer, ensuring the reliability and sealing of the connection. It can effectively prevent the delamination of the inner and outer wall panels and the insulation layer under impact, thereby improving the overall insulation performance of the refrigerated vehicle.

[0021] 2. The outer wall panels are assembled by sequentially biting together multiple base plates through plastic deformation. Compared with the traditional splicing methods of bonding, welding and riveting, no other additional connectors are required, which reduces the labor intensity of workers, improves production efficiency and realizes lightweight wall panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the thermal insulation wall panel in the first specific embodiment of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the ridges located in the thermal insulation layer in the first specific embodiment of the present invention.

[0024] Figure 3It is a schematic structural diagram of the outer wall panel in the first specific embodiment of the present invention.

[0025] Figure 4 FIG. 1 is a schematic structural diagram of a substrate in a first specific embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the buckling of the first flange and the second flange of the substrate in the first specific embodiment of the present invention.

[0027] Figure 6 for Figure 5 A buckling structure is formed by buckling the first flange and the second flange.

[0028] Figure 7 It is a schematic diagram of the arrangement of the snap-fit ​​structure and the forming mold in the first specific embodiment of the present invention.

[0029] Figure 8 It is a schematic diagram of the wavy-shaped engaging section in the first specific embodiment of the present invention.

[0030] Fig. 9 It is a schematic diagram of a V-shaped engaging section in the first specific embodiment of the present invention.

[0031] Fig.10 FIG. 4 is a schematic diagram of the connection between the first substrate and the second substrate in the second specific embodiment of the present invention.

[0032] The description of the accompanying drawings is as follows: 100-insulation wall panel, 1-outer wall panel, 10-substrate, 11-flange, 11a-first flange, 111-flange, 12a-second flange, 121-bite edge, 13-rib, 14-sealing strip, 15-buckle structure, 161-bite section, 162-fitting section, 18-filling hole, 3-inner wall panel, 5-insulation layer, 6-foaming cavity, 61-opening, 71-first substrate, 72-second substrate, 11b-first flange, 12b-second flange, 200-molding mold. DETAILED DESCRIPTION

[0033] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0034] The present embodiment provides a refrigerated truck and its insulation wall panels, which include a body and insulation wall panels arranged on the body. The body is a hollow frame structure, and a closable door is provided corresponding to the rear opening; the insulation wall panels cover the top and side walls of the body. The insulation wall panels include an inner wall panel tightly attached to the body, an outer wall panel wrapping the inner wall panel from the outside, and an insulation layer sandwiched between the outer wall panel and the inner wall panel, which are used to insulate refrigerated goods. The above-mentioned outer wall panel is formed by plastic deformation, bite and splicing of multiple substrates, and the convex ribs formed by the bite have good connection strength; and the convex ribs protrude inwardly to be embedded in the insulation layer, which plays a role in reinforcing the insulation layer, preventing the insulation layer from being delaminated with the inner and outer wall panels, and ensuring the insulation performance of the insulation wall panel.

[0035] The following will introduce the heat preservation wall plate of the refrigerated vehicle provided by the present embodiment in detail through several specific embodiments. The refrigerated vehicle provided by the present invention can be formed by installing the heat preservation wall plate on the vehicle body of the following embodiments.

[0036] First embodiment of the heat-insulating wall panel of a refrigerated truck

[0037] Please refer to Figure 1 , Figure 1 The specific structure of a heat-insulating wall panel 100 of a refrigerated vehicle provided in this embodiment is shown. The heat-insulating wall panel 100 comprises an outer wall panel 1 and an inner wall panel 3 which are arranged relatively spaced apart, and a heat-insulating layer 5 sandwiched between the outer wall panel 1 and the inner wall panel 3.

[0038] The outer wall panel 1 includes a plurality of base plates 10 made of metal material and having the same specifications.

[0039] Please combine Figure 2 , the two sides of each metal substrate 10 are bent to form two flanges 11. Multiple substrates 10 are spliced ​​flush in sequence, and the flanges 11 between two adjacent substrates 10 are bitten together through plastic deformation to form a convex rib 13. Multiple convex ribs 13 are distributed at intervals along the length direction of the spliced ​​outer wall panel 1 (compartment body), and all protrude to the inner side of the outer wall panel 1 to be embedded in the insulation layer 5. In this way, the outer wall panel 1 can be connected through the deformation of the metal sheet itself. This structural skill ensures the flatness of the wall panel, and can also ensure the strength, rigidity and sealing of the wall panel.

[0040] Furthermore, the structure of the inner wall plate 3 is the same as that of the outer wall plate 1, and also includes a plurality of metal substrates 10 sequentially spliced ​​side by side to improve the structural strength. At the same time, the inner side of the inner wall plate 3 facing the compartment body needs to be coated with a food grade coating.

[0041] Both sides of each base plate 10 of the inner wall plate 3 are bent to form two flanges 11 , and the flanges 11 between two adjacent base plates 10 are engaged by plastic deformation to form ribs 13 .

[0042] by Figure 2The inner wall plate 3 is overlapped on the outer wall plate 1, and the multiple convex ribs 13 on the inner wall plate 3 protrude toward the outer wall plate 1 and are staggered with the convex ribs 13 on the outer wall plate 1. The purpose is that the convex ribs 13 on the inner and outer sides are staggered with each other, with a certain gap between them, so that the thermal conductivity is reduced and the heat transfer is reduced.

[0043] Two adjacent ribs 13 on the inner wall plate 3 and two ribs on the opposite outer wall plate 1 define a small foaming cavity 6 in the interlayer between the inner and outer wall plates. The foaming cavity 6 has openings 61 at both ends along the length direction of the outer wall plate 1.

[0044] The plurality of foaming cavities 6 are connected in sequence through the openings 61 for the injection of foaming materials, and finally form the thermal insulation layer 5. The foaming material is usually polyurethane foam plastic, and the foaming cavity 6 is filled by injecting from the side opening in the thickness direction of each foaming cavity 6, which can ensure the uniformity of the polyurethane foam material of the whole board during the polyurethane foaming process, make the density of the polyurethane thermal insulation layer 5 consistent, and improve the quality of the thermal insulation wallboard 100.

[0045] Moreover, after the polyurethane is foamed to form the insulation layer 5, the protruding ribs 13 are embedded in the insulation layer 5, so that the wall panel and the insulation layer 5 are tightly connected together, and the insulation layer 5 is reinforced, which can effectively prevent the stratification of the wall panel and the insulation layer 5 and improve the strength and rigidity of the connection.

[0046] In this embodiment, the inner wall panel 3 is formed by splicing a plurality of metal substrates 10 to ensure the strength of the whole panel. In other embodiments, when the convex ribs 13 of the outer wall panel 1 can serve as reinforcing ribs for reinforcing the thermal insulation layer 5, the inner wall panel 3 can be a whole panel structure made of PE, so that the thermal insulation panel 100 has the advantages of high strength and light weight.

[0047] The outer wall plate 1 and the inner wall plate 3 are respectively punched by special punching equipment to produce plastic deformation, so that the flanges 11 on both sides of the respective base plates 10 can be engaged with each other. This bite connection method is not only tight, but also compared with the traditional splicing methods of bonding, welding, and riveting, it does not require adhesives and fasteners, and there is no need to consider the cracking of the weld. It is fast and convenient, reduces workload, and improves efficiency.

[0048] Next, please refer to Figure 3 and Figure 4 Taking the outer wall panel 1 as an example, the outer wall panel 1 includes a plurality of substrates 10 and a plurality of sealing strips 14 configured corresponding to each substrate 10 .

[0049] The two opposite flanges 11 on each substrate 10 are respectively a first flange 11 a and a second flange 12 a .

[0050] like Figure 4The first flange 11a is a flange 111 that is bent and vertically extended from a side edge of the base plate 10. The flange 111 is in a straight plate shape, and its connection with the base plate 10 can be approximately an L-shaped buckle portion for engaging with the second flange 12a.

[0051] The second flange 12a includes a bite edge 121 that is bent and vertically extended from the other side edge of the base plate 10 and another bite edge 121 that is connected to the bite edge 121 at an angle. The angle is an acute angle, so that the two bite edges 121 form a nearly V-shaped buckle connection portion.

[0052] The sealing strip 14 is made of elastic material and is disposed on the first flange 11a and attached to the upper end of the side of the first flange 11a facing the second flange 12a. The sealing strip 14 extends along the first flange 11a and does not extend beyond the two sides of the substrate 10 in the lateral direction.

[0053] Please refer to Figures 5 and 6 Before the stamping deformation, multiple substrates 10 are arranged side by side for splicing, and the outer side surfaces of the substrates 10 are flush. In the process of buckling the first flange 11a and the second flange 12a of two adjacent substrates 10, the flange 111 first extends into the gap between the two bite edges 121, and then the flange 111 is respectively fitted with the two bite edges 121; at the same time, the sealing strip 14 is attached between the flange 111 and one bite edge 121. The flange 111 and the two bite edges 121 together form a buckling structure 15 erected on the inner side of the substrate 10, realizing the buckling connection between the substrates 10 and ensuring the stability of the initial splicing of the substrates 10.

[0054] After buckling, due to the elastic deformation of the sealing strip 14, the tiny gap between the contact surfaces of the two metal substrates 10 at the buckle is well filled, preventing external moisture from penetrating into the insulation layer 5 in the middle of the insulation wall panel 100, effectively protecting the insulation layer 5 material and effectively extending the service life.

[0055] The buckling structure 15 is punched and deformed by a dedicated molding device to form a tight bite structure, namely, a convex rib 13 , so as to further increase the reliability of the structure and prevent the substrates 10 from loosening.

[0056] Please refer to Figure 7 and Figure 8 Two forming dies 200 are arranged on both sides of the buckle structure 15. The edges of the forming dies 200 are provided with arc-shaped protrusions, and the two sides of the buckle structure 15 are stamped synchronously in a direction perpendicular to the buckle structure 15.

[0057] The flange 111 of the first flange 11 a is punched to form a bite section 161 with an arc-shaped profile close to the substrate 10 , and the end of the bite section 161 further extends away from the substrate 10 to form a linear fitting section 162 .

[0058] The projected length of the engagement section 161 on the projection plane perpendicular to the substrate 10 is not less than the projected length of the bonding section 162 , thereby ensuring that the rib 13 has a sufficient engagement length.

[0059] The two engaging edges 121 of the second flange 12a are respectively formed into an engaging section 161 and a fitting section 162 by the same stamping deformation.

[0060] In this way, the flange 111 and the biting sections 161 of the two biting edges 121 are tightly engaged with each other through the matching arc profile; the flange 111 and the fitting sections 162 of the two biting edges 121 are relatively fitted, and the sealing strip 14 is attached between the fitting section 162 of the flange 111 and the fitting section 162 of one biting edge 121.

[0061] The end portion where the fitting sections 162 of the two engaging edges 121 meet is in an arc shape; there is a gap between the end portion and the end portion of the fitting section 162 of the flange 111 to form a ring-shaped closed filling hole 18 .

[0062] After the polyurethane foams to form the insulation layer 5, the protruding ribs 13 are embedded in the insulation layer 5, and the polyurethane fills the filling holes 18 at the bite points of the ribs 13, so that the wall panel and the insulation layer 5 are tightly connected together, which can effectively prevent the stratification of the wall panel and the polyurethane insulation layer 5 caused by impact during transportation, thereby improving the strength and rigidity of the insulation wall panel 100.

[0063] In this embodiment, the engaging section 161 is erected on the substrate 10 as a whole, specifically in a wave shape, and the fitting section 162 remains vertical.

[0064] In other embodiments, please refer to Fig. 9 The engaging section 161 may also be approximately V-shaped. The fitting section 162 connected to the V-shaped engaging section 161 is inclined. Of course, the engaging section 161 may also be semicircular, S-shaped or other shapes.

[0065] Multiple base plates 10 are interlocked by plastic deformation to form multiple ribs 13, which are spliced ​​to form an outer wall panel 1 or an inner wall panel 3. This is different from traditional welding and bonding methods, and greatly reduces the workload. Moreover, since the interlocking section 161 is a wavy arc design, it can be regarded as a flexible connection structure.

[0066] When the temperature difference between the inside and outside of the compartment is large, the inner wall panel 3 shrinks due to the cold and the outer wall panel 1 stretches due to the heat. Since ribs 13 are provided at regular intervals along the length direction of the inner and outer wall panels, the dimensional changes caused by the shrinkage and stretching of the wall panels can cause slight deformation of the V-shaped or L-shaped bends at the bite of the ribs 13, thereby buffering the shrinkage and stretching of the wall panels caused by the temperature difference between the inside and outside, thus greatly inhibiting the deformation of the panels and improving their service life.

[0067] In this embodiment, both molding dies 200 are rollers, and there are many options for molding methods. For example, one molding die 200 is fixed on one side of the convex rib 13, and the other molding die 200 moves horizontally along the edge of the convex rib 13 to roll and gradually squeeze the metal for bite. Alternatively, the two molding dies 200 move and roll along the edge of the convex rib 13 at the same time to gradually squeeze the metal for bite. In addition, the two molding dies 200 move relative to each other to gradually squeeze the metal for bite.

[0068] Second embodiment of the heat-insulating wall panel of a refrigerated truck

[0069] Please refer to Fig.10 The insulation wall panel provided in this embodiment is different from the insulation wall panel of the first embodiment in that the outer wall panel 1 is no longer formed by splicing a plurality of substrates 10 with the same structure, but includes a plurality of first substrates 71 and second substrates 72 with different structures spliced ​​alternately in sequence.

[0070] Specifically, the first substrate 71 and the second substrate 72 are both made of metal.

[0071] The two sides of the first substrate 71 are bent to form two opposite first flanges 11b. The first flange 11b is a flange 111 extending vertically from the first substrate 71. The flange 111 is in a straight plate shape and is connected to the substrate 10 in an L-shaped buckle portion for engaging with the second flange 12b.

[0072] The two side edges of the second substrate 72 are respectively bent to form two opposite second flanges 12b. The second flange 12b includes a bite edge 121 that is bent and vertically extended from the other side edge of the substrate 10 and another bite edge 121 connected to the bite edge 121 at an angle. The angle is an acute angle, so that the two bite edges 121 form a buckling portion that is approximately V-shaped.

[0073] The two sealing strips 14 are respectively and correspondingly attached to the inner side surfaces of the two first flanges 11 b.

[0074] During the buckling process, multiple first substrates 71 and second substrates 72 are alternately arranged side by side for assembly, and the outer surfaces of the first substrate 71 and the second substrate 72 are kept flush. The flange 111 is first extended into the gap between the two bite edges 121, and then the flange 111 is respectively attached to the two bite edges 121; at the same time, the sealing strip 14 is attached between the flange 111 and one bite edge 121. The flange 111 and the two bite edges 121 together form a buckling structure erected on the inner side of the substrate 10, realizing the buckling connection between the first substrate 71 and the second substrate 72.

[0075] During the bite process, the above-mentioned buckle structure is punched and deformed by a special forming die 200 to form a tight bite structure, i.e., the convex rib 13. The convex rib 13 is embedded in the insulation layer 5, plays a role in reinforcing the insulation layer 5, ensures the reliability and sealing of the connection, and can effectively prevent the delamination of the inner and outer wall panels and the insulation layer 5 under impact, thereby improving the overall insulation performance of the refrigerated vehicle.

[0076] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A heat-insulating wall panel of a refrigerated truck, comprising an outer wall panel, an inner wall panel and a heat-insulating layer sandwiched between the outer wall panel and the inner wall panel, characterized in that: The outer wall plate comprises a plurality of base plates which are aligned and spliced ​​in sequence, and the two sides of each base plate are bent to form two flanges; the flanges between two adjacent base plates are engaged together by plastic deformation to form convex ribs, and the plurality of convex ribs are distributed at intervals along the length direction of the outer wall plate and all protrude toward the inner side of the outer wall plate to be embedded in the thermal insulation layer; The two flanges of the base plate are respectively a first flange and a second flange; the first flange is a flange extending vertically from the base plate; the second flange includes a bite edge extending vertically from the base plate and another bite edge connected to the bite edge at an angle; The flange of one substrate extends between the two engaging edges of the other substrate and engages with the two engaging edges respectively to form the convex rib; The flange and the bite edge are both punched and recessed to form a bite section with an arc-shaped contour close to the base plate, and the end of the bite section extends away from the base plate to form a straight-line fitting section; The engaging section of the flange is correspondingly engaged with the engaging sections of the two engaging edges, and the bonding section of the flange is respectively bonded with the bonding sections of the two engaging edges; The end portion where the fitting sections of the two engaging edges meet is in an arc shape; there is a gap between the end portion and the end portion of the fitting section of the flange to form a ring-shaped closed filling hole.

2. The thermal insulation wallboard according to claim 1, characterized in that: The inner wall plate also includes a plurality of base plates spliced ​​side by side in sequence, the two sides of each base plate are bent to form two flanges, and the flanges between two adjacent base plates are engaged by plastic deformation to form convex ribs; the plurality of convex ribs on the inner wall plate protrude toward the outer wall plate and are staggered with the convex ribs on the outer wall plate; A foaming cavity is defined between any two adjacent ribs on the inner wall plate and two opposite ribs on the outer wall plate, and both ends of the foaming cavity have openings; a plurality of the foaming cavities are connected in sequence through the openings for injection of foaming materials to form the insulation layer.

3. The thermal insulation wallboard according to claim 1, characterized in that: The projection length of the engaging section on a projection plane perpendicular to the substrate is not less than the projection length of the bonding section.

4. The thermal insulation wallboard according to claim 1, characterized in that: The cross-sectional shape of the engaging section is wave-shaped, V-shaped or arc-shaped.

5. The thermal insulation wallboard according to claim 1, characterized in that: The outer wall plate also includes a sealing strip arranged corresponding to the base plate; The sealing strip is extended along the flange of the base plate and is attached between the flange and an attaching section of the bite edge.

6. The thermal insulation wallboard according to claim 1, characterized in that: The plurality of substrates include a plurality of first substrates and a plurality of second substrates which are alternately spliced ​​in sequence; Both flanges of the first substrate are first flanges, and the first flanges extend vertically from the first substrate; both flanges of the second substrate are second flanges, and the second flanges include a bite edge extending vertically from the second substrate and another bite edge connected to the bite edge at an angle; The first flange extends between the two engaging edges and engages with the two engaging edges respectively to form the convex rib.

7. A refrigerated vehicle, characterized in that: The refrigerated vehicle comprises a body and a heat-insulating wall panel as claimed in any one of claims 1 to 6 arranged on the body; The inner wall panels of the heat-insulating wall panels are closely attached to and cover the top and side walls of the compartment, and the outer wall panels wrap the inner wall panels from the outside.

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