Insulated door for a refrigeration appliance

Abstract

The application relates to the field of low-temperature storage technology, and discloses a heat-preservation door for a refrigeration device, which comprises a door shell, a door lining and a glass module, the door shell is provided with a hollow window, the door lining is combined with the door shell to form a mounting space, the glass module is arranged in the mounting space corresponding to the hollow window, the glass module comprises a glass body and a support, the glass body comprises outer glass, middle glass and inner glass arranged in sequence, the size of the middle glass exceeds that of the outer glass to form a mounting step, the outer glass is at least partially embedded in the hollow window, and the support is arranged in the mounting step and abuts against the inner side of the door shell.

Description

Technical Field

[0001] This application relates to the field of low-temperature storage technology, such as an insulated door for refrigeration equipment. Background Technology

[0002] The refrigerator door has a transparent viewing window area, allowing users to check the food inside the refrigerator without opening the door.

[0003] For example, related technologies disclose a refrigerator door with a viewing window, including a door body and a viewing window. The door body has a through-hole in the middle, and the viewing window is located at the mounting hole. The door body has a cavity for filling with foam filler, and a door liner located within the mounting hole. The door liner is positioned inside the viewing window, and a sealing layer is provided between the door liner and the viewing window. The viewing window is fixed to the door liner by the sealing layer. The door liner at the mounting hole can fix and limit the viewing window. Filling the cavity of the door body with foam filler improves the sealing performance and thermal insulation performance of the door body, thereby improving the refrigerator's heat preservation capacity. The viewing window allows users to easily observe the items inside the refrigerator, and the sealing layer further improves the sealing reliability between the viewing window and the door body, increasing the robustness of the viewing window.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: The viewing window needs to be fixed to the door frame with a sealant layer first. The viewing window is difficult to install and has poor positioning accuracy. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides an insulated door for refrigeration equipment to facilitate glass installation and improve installation accuracy.

[0007] In some embodiments, an insulated door for refrigeration equipment includes a door shell, a door liner, and a glass module. The door shell has a perforated window. The door liner is engaged with the door shell to form an installation space. The glass module is disposed in the installation space corresponding to the perforated window. The glass module includes a glass body and a support member. The glass body includes an outer glass layer, a middle glass layer, and an inner glass layer arranged sequentially. The size of the middle glass layer exceeds that of the outer glass layer to form an installation step. The outer glass layer is at least partially embedded in the perforated window. The support member is disposed on the installation step, and the outward side of the support member abuts against the inward side of the door shell.

[0008] In some embodiments, multiple sides of the middle glass extend outward beyond the outer glass to form an annular step, and the support is arranged in a ring shape on the annular step.

[0009] In some embodiments, the glass module further includes a first heating element disposed on the side of the support member near the outer glass.

[0010] In some embodiments, the support member is a hollow structure, and a first groove is formed on the side of the support member facing the outer glass, and the first heating element is disposed in the first groove.

[0011] In some embodiments, the side of the support member facing the door shell includes an abutment portion serving as the outer wall of the hollow structure and a sealing portion extending beyond the hollow structure, the sealing portion being elastically deformable to fit tightly against the inward side of the door shell.

[0012] In some embodiments, a second groove is provided at the connection position of the abutment portion and the sealing portion; the glass module further includes a second heating element disposed in the second groove.

[0013] In some embodiments, a first heat insulation cavity is formed between the outer glass layer and the middle glass layer, and a second heat insulation cavity is formed between the middle glass layer and the inner glass layer, wherein the thickness of the second heat insulation cavity is greater than the thickness of the first heat insulation cavity.

[0014] In some embodiments, the thickness of the first insulation cavity is greater than or equal to 12 mm and less than or equal to 16 mm.

[0015] In some embodiments, the middle glass is provided with a heating film layer.

[0016] In some embodiments, the size of the middle glass layer exceeds the size of the inner glass layer; the insulated door also includes a support column disposed on the door liner, the free end of the support column abutting against the portion of the middle glass layer that extends beyond the inner glass layer to pre-fix the glass module.

[0017] The heat-insulating door for refrigeration equipment provided in this embodiment can achieve the following technical effects: By extending the middle layer of glass to form an installation step and using independent support components, the glass module is modularized, simplifying the final assembly process and improving assembly efficiency and precision. The support components, acting as an intermediary structure, prevent the door shell from directly contacting the glass, preventing damage from the hard compression of the glass by metal parts, while absorbing and dispersing assembly stress. The outer layer of glass is embedded in the perforated window and flush with the door shell, enhancing the product's aesthetics. The abutting fit between the support components and the door shell forms a reliable positioning before foaming, ensuring the stability of the glass position during foaming and preventing glass displacement caused by the flow of foaming material.

[0018] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of the structure of an insulated door provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another heat-insulating door provided in an embodiment of this disclosure; Figure 3 yes Figure 2 A schematic cross-sectional view along line AA in the middle; Figure 4 yes Figure 3 Enlarged diagram of section B; Figure 5 This is a schematic diagram of the structure of a glass module provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of a display component provided in an embodiment of this disclosure; Figure 7 This is an exploded schematic diagram of an insulated door provided in an embodiment of this disclosure; Figure 8 yes Figure 7 Enlarged diagram of section C; Figure 9 This is a schematic diagram of the structure of the door liner of the insulated door provided in this embodiment; Figure 10 This is a schematic diagram of the material guide tube of the heat-insulating door provided in this embodiment.

[0020] Figure label: 100: Shell; 110: Door shell; 111: Hollowed-out window; 112: Bending section; 1121: Guide slope; 120: Door liner; 121: Snap-fit ​​structure; 123: Support column; 130: Installation space; 131: First foaming area; 132: Second foaming area; 133: Third foaming area; 134: Fourth foaming area; 200: Glass module; 210: Glass body; 211: Outer glass; 212: Middle glass; 213: Inner glass; 220: First heat insulation cavity; 230: Second heat insulation cavity; 300: Support component; 301: The first 302: Groove; 303: Abutment part; 304: Sealing part; 305: Guide gap; 310: First sealing element; 320: Second sealing element; 400: First heating element; 410: Second heating element; 420: Display component; 421: Housing; 4211: First shielding surface; 4212: Second shielding surface; 4213: Display surface; 422: Light strip; 430: Wiring harness; 500: Guide tube; 510: Feed tube; 520: First branch tube; 530: Second branch tube; 540: Diverter plate; 550: Decorative cover; 560: Injection tube. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0024] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0025] Unless otherwise stated, the term "multiple" means two or more.

[0026] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0027] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0029] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of this disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Figure 1-10As shown, this embodiment of the present disclosure provides an insulated door for refrigeration equipment. The insulated door includes a door shell 110, a door liner 120, and a glass module 200. The door shell 110 has a perforated window 111. The door liner 120 is engaged with the door shell 110 to form an installation space 130. The glass module 200 is disposed in the installation space 130 corresponding to the perforated window 111. The glass module 200 includes a glass body 210 and a support member 300. The glass body 210 includes an outer glass layer 211, a middle glass layer 212, and an inner glass layer 213 arranged sequentially. The size of the middle glass layer 212 exceeds that of the outer glass layer 211 to form an installation step. The outer glass layer 211 is at least partially embedded in the perforated window 111. The support member 300 is disposed on the installation step, and the outward side of the support member 300 abuts against the inward side of the door shell 110.

[0030] In this embodiment, the door shell 110 is the outer sheet metal part of the insulated door, formed by stamping and bending steel plate. A perforated window 111 is provided on the front side, the size of which corresponds to the visible area of ​​the glass module 200, for displaying the glass for observation of the items inside the box. The door liner 120 is the inner plastic part of the insulated door, formed by vacuum forming. Its edges interlock with the folded edges around the door shell 110, together forming a closed installation space 130, which is subsequently filled with foamed insulation material.

[0031] Preferably, the periphery of the perforated window 111 is bent inward to form a edging structure, and the edge of the outer glass 211 is embedded inside the edging structure, so that the front surface of the outer glass 211 is basically flush with or slightly concave to the front surface of the door shell 110, thereby achieving a beautiful and flat appearance. A small gap is reserved between the periphery of the outer glass 211 and the edging of the perforated window 111, which can be filled by foaming material during foaming to play a sealing and cushioning role.

[0032] The glass module 200, as an independent pre-assembled unit, has its components assembled before being installed into the door shell 110. The core of this module is a triple-glazed, two-cavity glass body 210, consisting of an outer glass layer 211, a middle glass layer 212, and an inner glass layer 213, arranged from the outside in. The middle glass layer 212 is designed to have a larger profile than the outer glass layer 211, thus forming a protruding mounting step at the circumferential edge of the glass body 210. The support member 300 is a dedicated frame made of PVC or other polymer materials, with an L-shaped or U-shaped cross-section, and sits on the mounting step. The support member 300 and the glass body 210 are fixed together by snap-fit, adhesive, or interference fit, forming an inseparable, integral glass module 200.

[0033] During assembly, the operator pushes the pre-assembled glass module 200 into the perforated window 111 from the inside of the door shell 110, embedding the outer glass 211 into the window. At this time, the support member 300 on the mounting step is located inside the door shell 110. The outward-facing side of the support member 300 abuts against the inner wall of the door shell 110, thereby positioning the glass module 200 in the thickness direction and preventing it from coming out forward. Subsequently, the door liner 120 is fastened to the door shell 110, and the support column 123 on the door liner 120 can further press against the rear side of the glass module 200, achieving pre-fixation of the module. After the above assembly is completed, the entire door body is sent into the foaming line, and foaming material is injected into the installation space 130. After the foaming material cures, it permanently fixes the position of each component.

[0034] In operation, the support member 300 serves two purposes: it acts as a load-bearing component, evenly transmitting the pressure applied by the door shell 110 to the middle glass layer 212 of the glass body 210; and it also acts as a sealing component, with the support member 300 tightly attached to the door shell 110 to prevent the foaming material from flowing into the gap between the glass and the door shell 110 during foaming. The outer glass layer 211, as the outermost barrier, directly faces the external environment; the middle glass layer 212 can be equipped with a heating function to prevent condensation; and the inner glass layer 213 faces inward. The synergistic effect of these three components ensures the thermal insulation performance and visibility of the insulated door.

[0035] The insulated door provided in this embodiment adopts a middle layer glass 212 extending to form an installation step and cooperating with an independent support 300, realizing the modularization of the glass module 200, simplifying the final assembly process, and improving assembly efficiency and accuracy. The middle layer glass extends to form an installation step, and the support set on the installation step is located inside the sheet metal of the door shell. The part of the middle layer glass that extends beyond the outer layer glass is also located inside the sheet metal of the door shell, which can reduce the black edge of the glass module from the front view. The support 300, as an intermediate structure, avoids the door shell 110 from directly contacting the glass, prevents hard extrusion damage to the glass by the metal parts, and absorbs and disperses assembly stress. The outer layer glass 211 is embedded in the hollow window 111 and is flush with the door shell 110, which improves the product's aesthetics. The abutment fit between the support 300 and the door shell 110 forms a reliable positioning before foaming, ensuring the stability of the glass position during the foaming process and avoiding glass displacement caused by the flow of foaming material.

[0036] Optionally, multiple sides of the middle glass 212 extend outward beyond the outer glass 211 to form an annular step, and the support member 300 is arranged in a ring shape on the annular step.

[0037] In this embodiment, the annular step refers to the fact that the four edges (i.e., the top, bottom, left, and right sides) of the middle glass 212 extend outward and beyond the outline of the outer glass 211, thereby forming a continuous stepped structure around the circumference of the glass body 210. The corresponding annular support 300 is a closed frame structure that matches the shape of the annular step. It is annular in shape and can completely surround the glass body 210, thus cooperating with the annular step.

[0038] The design of the ring-shaped steps is not limited to conventional rectangular doorways; it can also be adapted to insulated doors with other irregularly shaped perforated windows 111, as long as the extension of the middle glass 212 remains continuous. The ring structure of the support component 300 can be integrally injection molded to ensure structural strength and dimensional accuracy; alternatively, it can be composed of multiple segmented components, such as connecting four separate L-shaped support bars with end clips to form a ring. This design reduces mold complexity and manufacturing costs, and is particularly suitable for large-sized doorways.

[0039] In some optional embodiments, a buffer pad can be provided between the contact surface of the support member 300 and the annular step. This pad can absorb assembly gaps caused by manufacturing tolerances and also act as a shock absorber, preventing the glass from rigidly colliding with the rigid support member 300 due to vibration during transportation or use. The width of the annular step is not a fixed value and can be adaptively adjusted according to the total thickness of the door, the structural strength requirements of the support member 300, and the thickness requirements of the foam layer. For example, it can be set in the range of 5mm to 15mm to ensure that the support member 300 has sufficient load-bearing area without excessively encroaching on the foam space.

[0040] By extending multiple sides of the middle glass 212 outward to form annular steps, and cooperating with the annular support member 300, uniform circumferential support of the glass body 210 is achieved by the support member 300. The annular support member 300, covering the annular steps, evenly distributes the pressure applied by the door shell 110 to the glass module 200 across the entire circumferential edge of the middle glass 212, avoiding localized stress concentration and reducing the risk of glass breakage during long-term use. The combination of the annular steps and the annular support member 300 forms a continuous barrier circumferentially around the glass, facilitating effective sealing of the foaming cavity during the foaming process. This continuous contact surface prevents foam material from seeping into the visible area through the gap between the glass and the support member 300, improving the cleanliness of the finished product's appearance.

[0041] Optionally, the glass module 200 also includes a first heating element 400, which is disposed on the side of the support 300 near the outer glass 211.

[0042] In this embodiment, the "first heating element 400" refers to a heating element used to generate heat to prevent condensation on the glass surface, specifically in the form of a heating wire, a flexible heating film, or a heating strip. The side of the support member 300 near the outer glass 211 refers to the front surface of the support member 300, that is, the surface facing the outside and adjacent to or opposite the edge area of ​​the outer glass 211 when the support member 300 is installed on the glass module 200. By placing the first heating element 400 in this position, the peripheral area of ​​the outer glass 211 is directly heated.

[0043] The arrangement of the first heating element 400 on the support 300 can be implemented in various ways. For example, the first heating element 400 can be continuously laid along the circumference of the support 300 to form a closed-loop heating zone surrounding the glass, thereby uniformly heating the entire edge of the outer glass 211. Another example is that the first heating element 400 can be arranged only on the lower side of the support 300. The first heating element 400 can be fixed to the support 300 by adhesive bonding or by embedding.

[0044] With this configuration, because the heating element is close to the edge of the outer glass 211, heat can be directly transferred to the glass through thermal conduction. This results in a short heating path and rapid thermal response, quickly raising the surface temperature of the glass edge to ensure it remains above the dew point temperature of the ambient air. This effectively prevents condensation around the outer glass 211 caused by temperature differences between indoors and outdoors, ensuring a clear view for users observing items inside the enclosure. Compared to applying a heating film to the entire glass surface or arranging a large area of ​​heating wires on the door shell 110, concentrating the heating element in the easily condensing edge area achieves precise temperature control, avoids unnecessary heat waste, and improves the energy efficiency of the refrigeration equipment. Pre-integrating the first heating element 400 onto the support 300 makes the heating element part of the glass module 200. This reduces assembly steps, lowers the risk of human error, and improves production efficiency and product consistency.

[0045] Optionally, the support member 300 has a hollow structure, and a first groove 301 is provided on the side of the support member 300 facing the outer glass 211, and the first heating member 400 is disposed in the first groove 301.

[0046] A hollow structure refers to a support member 300 whose interior is not solid, but has one or more cavities extending along its extension direction. The first groove 301 is a recessed groove extending along a certain path, formed on the outdoor-facing surface of the support member 300, and its cross-sectional shape matches the shape of the first heating element 400. The first heating element 400 is embedded and accommodated within the first groove 301, so that the heating element does not protrude from the surface of the support member 300 or only slightly protrudes.

[0047] The support component 300 has a hollow structure, which reduces its thermal conductivity, thereby reducing the temperature difference between the glass module 200 and the indoor environment and lowering the risk of condensation on the insulated door. The support component 300 has a first groove 301, which increases the temperature at the support component 300 and the edges of the outer glass 211 and middle glass 212, further reducing the risk of condensation on the insulated door.

[0048] Optionally, the side of the support member 300 facing the door shell 110 includes an abutment portion 302 that serves as the outer wall of the hollow structure and a sealing portion 303 that extends beyond the hollow structure. The sealing portion 303 can be elastically deformed to fit tightly against the inward side of the door shell 110.

[0049] The abutment portion 302 refers to the solid outer wall portion of the hollow structure of the support member 300 facing the door shell 110. This portion has a certain structural strength and rigidity, and its main function is to form physical contact with the inner surface of the door shell 110, transmitting and bearing the pressure of the door shell 110 on the glass module 200. The sealing portion 303 refers to the thin-walled or lip-shaped structural portion extending further outward from the abutment portion 302. This portion usually extends beyond the main body of the hollow structure and has the characteristic of elastic deformation. Elastic deformation means that the sealing portion 303 can undergo flexible deformation when squeezed by the door shell 110, thereby closely conforming to the microscopic undulations of the inner surface of the door shell 110 and filling the gap between them.

[0050] The contact portion 302 and the sealing portion 303 can be integrated into a single design, meaning they are both made of the same material using the same molding process. The specific shape of the sealing portion 303 can be varied according to actual sealing requirements. For example, the sealing portion 303 can be designed as a simple straight lip shape, where a thin-walled straight piece extends from the front end of the contact portion 302; it can also be designed as a hooked lip shape to increase the contact area with the door housing 110; or it can be designed as a hollow bubble shape, where the sealing portion 303 has a closed small cavity inside. This bubble structure provides better elastic compensation and sealing effect under pressure. The sealing portion 303 can be continuously arranged along the entire circumference of the support member 300, forming a complete annular sealing wall.

[0051] The elastically deformable sealing part 303 can adaptively conform to the unevenness or slight undulations of the inner surface of the door shell 110. Even with manufacturing tolerances or assembly deviations, it can effectively fill all gaps between the abutment part 302 and the door shell 110, forming a reliable flexible barrier. This fundamentally prevents liquid foaming material from seeping into the visible glass area from the joint between the support member 300 and the door shell 110 during the foaming process, ensuring the appearance quality and yield of the finished product. The abutment part 302, with its rigidity, undertakes the main support and positioning functions, ensuring the accurate position of the glass module 200 in the thickness direction and resisting foaming pressure; while the sealing part 303, with its flexibility, focuses on the sealing function. The clear division of labor avoids the dilemma of sacrificing support strength for sealing effect, or abandoning sealing for strength. The combination of rigidity and flexibility allows the support member 300 to simultaneously meet the dual requirements of structural mechanics and process sealing. The elastic deformation capability of the sealing part 303 can compensate for the cumulative effects of various tolerances, such as the bending angle deviation of the door shell 110, the dimensional fluctuation of the support 300, and the assembly position error. This ensures that even if the manufacturing precision of each component varies slightly, the assembled door can still achieve a good sealing effect, reducing the stringent requirements on component precision and assembly operations.

[0052] Optionally, a second groove 304 is provided at the connection position between the abutment portion 302 and the sealing portion 303; the glass module 200 also includes a second heating element 410, which is disposed in the second groove 304.

[0053] The connection point between the contact portion 302 and the sealing portion 303 refers to the transition area where the rigid and elastic portions of the support member 300 intersect, or the boundary where the structural thickness or material properties change. The second groove 304 refers to a groove-like structure opened at this connection point to accommodate the second heating element 410, or it may be intermittently distributed continuously along the extension direction of the support member 300. The second heating element 410 refers to a heating element similar to the aforementioned first heating element 400 but with a different functional positioning. Specifically, it may be a heating wire, heating film, or heating band, etc., and is disposed within the second groove 304.

[0054] The second heating element 410 can be used, for example, to address the risk of condensation at the edge of the door housing 110. Since the door housing 110 is made of metal, it conducts heat quickly but its temperature is easily affected by the external environment. When the ambient humidity is high or the temperature is low, the second heating element 410 is activated to directly heat the edge of the door housing 110, keeping its surface temperature above the dew point.

[0055] The second heating element 410 is located near the contact area between the support member 300 and the door shell 110. The heat it generates can be directly transferred to the metal door shell 110, effectively increasing the surface temperature of the edge of the door shell 110 and preventing condensation from forming on the outer surface due to excessively low temperature. This complements the function of the first heating element 400, which is mainly responsible for heating the glass edge, and together they form a dual anti-condensation protection system, which is especially suitable for high humidity environments or usage scenarios with large temperature differences. The second groove 304 is located at the connection position between the abutment part 302 and the sealing part 303. This area may originally be a transition area or an unused area in the structure. By opening a groove to accommodate the heating element, the space of the support member 300 is fully utilized without the need to add additional components or increase the size, maintaining the compactness of the overall structure.

[0056] Optionally, a first heat insulation cavity 220 is formed between the outer glass layer 211 and the middle glass layer 212, and a second heat insulation cavity 230 is formed between the middle glass layer 212 and the inner glass layer 213, wherein the thickness of the second heat insulation cavity 230 is greater than the thickness of the first heat insulation cavity 220.

[0057] In this embodiment, the first heat insulation cavity 220 refers to a closed space formed by the rear surface of the outer glass 211, the front surface of the middle glass 212, and the surrounding edge sealing structure. The second heat insulation cavity 230 refers to another closed space formed by the rear surface of the middle glass 212, the front surface of the inner glass 213, and the corresponding edge sealing structure. "Thickness" refers to the vertical distance between the two glass panes constituting the heat insulation cavity along the thickness direction of the door body. The thickness of the second heat insulation cavity 230 is greater than the thickness of the first heat insulation cavity 220, meaning that the cavity near the rear side of the door body has a larger geometric dimension than the cavity near the front side.

[0058] During operation of the refrigeration equipment, the inner side of the glass module 200 is in direct contact with the low-temperature environment inside the chamber, while the outer side faces the room temperature environment. Therefore, a certain temperature gradient exists along the thickness of the door. Since the temperature difference is greater and the heat flux density is higher closer to the interior side, a thicker insulation layer is required to achieve higher thermal resistance. By designing the second insulation cavity 230 to be thicker than the first insulation cavity 220, a reasonable distribution of thermal resistance can be achieved within the limited total thickness of the door, maximizing the insulation performance.

[0059] In one specific embodiment, the total thickness of the door is approximately 40mm. The outer glass layer 211 and the inner glass layer 213 are both 3.2mm thick, the middle glass layer 212 is 4.0mm thick, the second insulation cavity 230 is designed to be 16mm thick, and the first insulation cavity 220 is 13.7mm thick. This configuration, without exceeding the total glass thickness limit, provides a thicker insulation layer closer to the interior, effectively preventing the transfer of cold air from inside the enclosure to the outside.

[0060] The thickness of the first insulation cavity 220 can be between 12mm and 16mm, and the thickness of the second insulation cavity 230 can be between 16mm and 20mm. The difference between the two can be adjusted according to actual needs, for example, between 2mm and 6mm. It should be noted that the thickness of the insulation cavity is not necessarily better the larger it is. An excessively thick cavity may lead to increased internal gas convection, which may reduce the insulation effect. Therefore, the above numerical ranges are the preferred ranges verified by thermal simulation and experiments, which can achieve a balance between convective heat transfer and thermal conduction.

[0061] The asymmetric design based on temperature gradients ensures that the area with the greatest thermal resistance corresponds to the location with the greatest temperature difference, achieving optimized thermal resistance configuration. The thicker second insulation cavity 230 effectively blocks the transfer of cold air from inside the chamber to the outside, reducing the heat load on the refrigeration equipment, which helps improve energy efficiency and achieves energy saving. The insulated door provided in this embodiment can achieve better insulation performance than a design with equal thickness without increasing the overall thickness of the glass. Designing the first insulation cavity 220 to be relatively thin means that the distance between the outer glass 211 and the middle glass 212 is smaller, which allows the edge area of ​​the outer glass 211 to be designed to be narrower. Combined with the structure of the middle glass 212 extending to form an installation step as described above, the black area on the front can be reduced from the traditional 30mm to 13mm or even narrower, improving the transparency and aesthetics of the door.

[0062] Optionally, the thickness of the first insulation cavity 220 is greater than or equal to 12 mm and less than or equal to 16 mm.

[0063] The insulation effect of the insulation cavity mainly depends on the thermal conductivity of the gas inside the cavity and the intensity of gas convection. For argon or air, when the insulation cavity thickness is less than 10 mm, the heat conduction path is short and the thermal resistance is insufficient, leading to a decrease in insulation performance. When the insulation cavity thickness exceeds, for example, 18 mm, the gas convection inside the cavity intensifies, which may form a convective heat transfer circulation, also reducing the insulation effect. When the thickness of the first insulation cavity 220 is in the range of 12 mm to 16 mm, it can achieve the best balance between suppressing convection and increasing the length of the heat conduction path, thus minimizing the equivalent thermal conductivity.

[0064] Optionally, the middle glass 212 is provided with a heating film layer.

[0065] The front surface of the intermediate glass 212 faces the outer glass 211, and the rear surface faces the inner glass 213. The heating film layer refers to a transparent conductive thin film layer formed on the surface of the intermediate glass 212 through physical or chemical vapor deposition, spraying, or printing, such as indium tin oxide (ITO) coating, silver nanowire coating, or carbon nanotube film. This film layer can generate Joule heat when energized, thus achieving a heating function. The heating film layer facing the outer glass 211 means that the transparent conductive film is disposed on the front surface of the intermediate glass 212, i.e., the side closest to the outer glass 211, so that the heat generated by the heating film layer is mainly transferred towards the outer glass 211. Preferably, the heating film layer faces the outer glass 211.

[0066] The heat generated by the heating film layer is directly transferred to the outer glass 211 via radiation. This short heat transfer path and high efficiency allow for a rapid increase in the temperature of the outer glass 211. The transparent conductive film layer has extremely high visible light transmittance (typically exceeding 85%), barely affecting the clarity of the user's view of the items inside the case. The heating film layer is responsible for large-area, basic heating, while the first heating element 400 and the second heating element 410 are responsible for localized, enhanced heating of the edges of the door shell 110 and the sealing portion 303 of the support 300. Each component performs its specific function, forming a complete anti-condensation solution from the center to the edge of the glass, and from the glass body 210 to the door shell 110, making it particularly suitable for harsh environments with high humidity and large temperature differences.

[0067] Optionally, the size of the middle glass 212 exceeds the size of the inner glass 213; the insulated door also includes a support column 123, which is disposed in the door liner, and the free end of the support column 123 abuts against the portion of the middle glass 212 that exceeds the inner glass 213 to pre-fix the glass module 200.

[0068] The size of the middle glass 212 exceeding that of the inner glass 213 means that on the rear side of the glass body 210, the outline edge of the middle glass 212 extends outward beyond the edge of the inner glass 213, thus forming an exposed stepped surface not covered by the inner glass 213 in the rear surface edge area of ​​the middle glass 212. The support column 123 refers to a columnar protrusion structure set on the inner surface of the door liner 120, i.e., the side facing the foaming cavity. It can be a hollow or solid boss integrally formed during the vacuum forming of the door liner 120, or a plastic or metal column that is independently manufactured and then assembled onto the door liner 120. Pre-fixing refers to temporarily fixing the glass module 200 in the designed position within the door body using the support column 123 before the foaming process, preventing it from shifting during the injection and flow of the foaming material. The part of the free end that abuts against the middle glass 212 that extends beyond the inner glass 213 means that the front end of the support column 123 forms physical contact with the exposed area of ​​the rear surface of the middle glass 212, applying a forward supporting force to the glass module 200.

[0069] In one embodiment, the support column 123 can be integrally formed with the door liner 120, and the protruding structure on the door liner 120 can be directly produced by vacuum forming or injection molding. The advantages of this integrated design are low cost, no need for additional assembly processes, and good consistency due to the positional accuracy guaranteed by the mold. The support column 123 can be cylindrical, square, or a ribbed irregular shape, and its interior can be hollow to reduce weight and save material. The opening of the hollow portion typically faces the rear side of the door liner 120. Preferably, the support column 123 has a C-shaped cross-section, which reduces the material used for the support column 123.

[0070] When the door liner 120 is fastened to the door shell 110, the support column 123 first contacts the middle glass 212, gently holding the glass module 200 in place. At this time, even before the foaming material is injected, the glass module 200 will not shift due to gravity or slight shaking. In the subsequent foaming process, the foaming material is injected from the injection port, flows and expands within the foaming cavity. Since the glass module 200 is pre-fixed by the support column 123, the flow pressure of the foaming material will not cause it to deviate, ensuring the accuracy of the glass position after foaming. After foaming is completed, the support column 123 is completely encased in the foaming material, becoming part of the permanent structure. At this point, in addition to its positioning function, the support column 123 can also serve as a reinforcing rib inside the foam layer, enhancing the overall structural strength of the door.

[0071] With the pre-fixation of the support column 123, operators do not need to use additional tooling or manual support to maintain the glass position before foaming. The next process can proceed immediately after the door liner 120 is fastened, simplifying the operation, reducing manual intervention, and facilitating automated production. The support column 123 abuts against the exposed portion of the middle glass 212 extending beyond the inner glass 213. This area was originally "unused" space created by the structural design; using it as a support point eliminates the need for additional structures on the glass or additional door space, achieving efficient structural utilization. The support column 123 applies a forward thrust from the rear, forming a balanced force with the rearward pressure applied by the door shell 110 through the support member 300 from the front. Together, they stably clamp the glass module 200 in the correct position along the door thickness direction. This two-way constraint mechanical model is more stable and reliable than single-sided support.

[0072] Optionally, the glass module 200 includes an outer glass layer 211, a middle glass layer 212, a first sealing member 310, an inner glass layer 213, and a second sealing member 320, wherein a first heat insulation cavity 220 is formed between the middle glass layer 212 and the outer glass layer 211; the first sealing member 310 is disposed at the periphery of the first heat insulation cavity 220 to seal the first heat insulation cavity 220; a second heat insulation cavity 230 is formed between the inner glass layer 213 and the middle glass layer 212; the second sealing member 320 is disposed at the periphery of the second heat insulation cavity 230 to seal the second heat insulation cavity 230; wherein, at at least one edge of the glass module 200, the first sealing member 310 and the second sealing member 320 are misaligned.

[0073] In this embodiment, the housing 100 refers to the main frame structure of the insulated door, typically including an outer door shell 110 and an inner door liner 120, which interlock to form an installation space 130 for accommodating the glass module 200 and the foamed insulation material. The glass module 200 refers to an independent functional unit pre-assembled from multiple layers of glass and surrounding seals. The outer glass 211, middle glass 212, and inner glass 213 refer to three layers of transparent panels arranged sequentially from front to back along the thickness direction of the door. The first insulation cavity 220 is the enclosed space formed between the rear surface of the outer glass 211 and the front surface of the middle glass 212, and the second insulation cavity 230 is the enclosed space formed between the rear surface of the middle glass 212 and the front surface of the inner glass 213. These two insulation cavities can be filled with gases with low thermal conductivity to enhance the insulation effect.

[0074] The first sealing element 310 refers to a sealing structure disposed around the periphery of the first heat insulation cavity 220 to isolate the cavity from the external environment, and the second sealing element 320 refers to a sealing structure disposed around the periphery of the second heat insulation cavity 230 to isolate the cavity from the external environment. The sealing elements are typically composed of a composite of multiple materials, including but not limited to molecular sieves, butyl rubber, and structural adhesives.

[0075] The misalignment setting refers to the arrangement of the first seal 310 and the second seal 320 at at least one edge of the glass module 200, which are not aligned vertically along the thickness direction, but are offset from each other in the horizontal direction, that is, along the glass plane direction, so that the two seals do not overlap or only partially overlap in the projection direction, thereby forming a non-linear heat transfer path at the glass edge.

[0076] In traditional triple-glazed structures, the seals of the two insulation chambers are typically aligned along the thickness direction, meaning the second seal 320 is directly below the first seal 310. While this alignment is structurally neat and easy to manufacture, it creates a straight thermal bridge at the glass edge—heat can be conducted directly from the indoor side to the outdoor side along the seal material, or vice versa, thus reducing the insulation effect of the insulation chamber to some extent.

[0077] This embodiment breaks the linear heat conduction path by misaligning the first seal 310 and the second seal 320. When the two seals are misaligned, heat needs to travel a longer path to transfer from one seal to the other, and this path may also pass through materials with low thermal conductivity, such as glass edges or foam layers, thereby increasing thermal resistance and reducing heat leakage. Thermal bridges are blocked by introducing a discontinuous structure in the heat conduction path.

[0078] There are several ways to implement the misalignment arrangement. In one embodiment, the first seal 310 can be positioned closer to the glass edge, while the second seal 320 is positioned further inward relative to the glass edge, creating a significant horizontal offset between the two. For example, the outer edge of the first seal 310 is flush with the edge of the middle glass 212, while the outer edge of the second seal 320 is recessed inward relative to the edge of the inner glass 213. This arrangement ensures that the two seals are completely misaligned in the thickness direction, requiring the heat conduction path to extend horizontally inward from the first seal 310 to above the second seal 320 before proceeding downward, significantly extending the path.

[0079] The misalignment can be achieved segmented along the same edge. For example, on the left edge of the glass module 200, the first seal 310 is positioned outwards and the second seal 320 inwards; while on the right edge, the first seal 310 can be positioned inwards and the second seal 320 outwards. This asymmetrical design can adapt to the thermal requirements of different parts of the door. In one specific embodiment, the misalignment can be controlled within the range of 3mm to 15mm. For small-sized doors, a smaller misalignment value can be used; for large-sized doors, a larger value can be used to fully utilize the thermal insulation potential.

[0080] This arrangement breaks the linear thermal bridge formed by traditional aligned seals, forcing heat to transfer along a longer zigzag path, effectively increasing thermal resistance and reducing heat leakage through the glass edges. The staggered arrangement improves thermal insulation performance by optimizing the geometric layout without significantly increasing the overall thickness and cost of the door. The staggered arrangement of the molecular sieve, as a thermal bridge component in the seal, minimizes its negative impact, ensuring that it performs its adsorption and drying function without becoming a major channel for heat leakage. The staggered arrangement utilizes the space formed by the extension of the middle glass 212, allowing the first seal 310 and the second seal 320 to be arranged in a staggered manner, ensuring sealing function while providing space for other components.

[0081] Optionally, at least a portion of the middle glass 212 extends beyond the inner glass 213 so that a first portion of the first seal 310 extends beyond the second seal 320, and the position of the middle glass 212 corresponding to the first portion cooperates with the housing 100 to form a foamed space.

[0082] At least a portion of the middle glass 212 extending beyond the inner glass 213 means that, on the rear side of the glass module 200, the outline edge of the middle glass 212 extends outward on at least one side, exceeding the edge of the inner glass 213, forming an exposed area. The first portion of the first seal 310 refers to the section of the first seal 310 corresponding to the extended portion of the middle glass 212. The first portion of the first seal 310 extending beyond the second seal 320 means that, in this edge region, the first seal 310 is positioned closer to the glass edge than the second seal 320, or the second seal 320 is recessed inward relative to the first seal 310. The position of the middle glass 212 corresponding to the first portion, in conjunction with the housing 100, forming a foaming space, means that around the extended portion of the middle glass 212, a cavity area is jointly enclosed by the rear surface of the middle glass 212, the housing 100, and the seal, and this area is filled with foaming material during foaming.

[0083] When the middle glass 212 is larger than the inner glass 213, the edge of the inner glass 213 is recessed inward relative to the middle glass 212. To seal the second heat insulation cavity 230, the second sealing element 320 must be positioned between the middle glass 212 and the inner glass 213. Therefore, its outer edge position is limited by the edge of the inner glass 213 and can only be positioned inside the edge of the inner glass 213. The first sealing element 310, positioned between the middle glass 212 and the outer glass 211, can extend all the way to the edge of the middle glass 212 and even beyond it. Thus, in the first part near the first sealing element 310, a state of extension relative to the second sealing element 320 is naturally formed, achieving a misalignment between the two. Behind the extended portion of the middle glass 212, since the inner glass 213 does not extend to this area, there is no second heat insulation cavity 230 in this region; instead, the rear surface of the middle glass 212 faces the front surface of the door liner 120. Around the extended portion of the first seal 310, the first seal 310, the edge of the middle glass 212, the bend in the door shell 110, and the door liner 120 together form an annular or partially annular cavity. This cavity is filled with foaming material during foaming to form part of the foamed insulation layer.

[0084] The middle glass 212 extending beyond the inner glass 213 provides a structural basis for the misalignment of the seals and naturally creates space for the foam filling, eliminating the need for additional components or processes. The rear of the extended portion of the first seal 310 is encased in foam; the cured foam provides strong support and fixation, preventing displacement or loosening of the seal during long-term use. The foam filling behind the extended portion of the seal has a much lower thermal conductivity than the seal material, effectively blocking heat transfer to the interior through the seal, creating a double insulation effect with the misaligned structure. Utilizing the space behind the extended portion of the middle glass 212 as the foaming area improves the utilization rate of the door's internal space, helping to achieve better insulation within a limited door thickness.

[0085] Optionally, the first portion of the first seal 310 is the portion corresponding to the downward edge of the glass module 200.

[0086] The downward edge of the glass module 200 refers to the bottom edge of the insulated door when it is in normal use, i.e., when installed on a refrigeration device, corresponding to the bottom of the door. The first portion of the first seal 310 refers to the section of the first seal 310 that extends beyond the second seal 320. Setting the first portion at the downward edge of the glass module 200 means that the misalignment structure of the first seal 310 and the second seal 320 is achieved at the bottom of the door. At other edges, the first seal 310 and the second seal 320 can be conventionally aligned or other designs can be used.

[0087] In practical use, the high density of cold air inside the enclosure causes it to sink naturally, resulting in a lower temperature at the bottom compared to the top. This temperature difference creates the largest temperature gradient at the bottom, making the bottom edge a high-risk area for condensation. Simultaneously, heat is most easily leaked outwards through thermal bridges formed by the seals at the bottom edge. By specifically applying a staggered structure where the first seal 310 extends beyond the second seal 320 to the bottom edge, the heat conduction path can be interrupted at the location where enhanced insulation is most needed.

[0088] Optionally, the insulated door also includes a display component 420, which is disposed in the first insulation cavity 220 and shields the outward side of the second seal 320.

[0089] In this embodiment, the display component 420 refers to an electronic device used to present information or realize interactive functions, specifically an LED display screen, a liquid crystal display screen, a touch screen, an indicator panel, or a combination of the above devices. "Set in the first heat insulation cavity 220" means that the display component 420 is installed in the enclosed space between the outer glass 211 and the middle glass 212, typically fixed to the front surface of the middle glass 212 or the rear surface of the outer glass 211. "Shielding the outward side of the second seal 320" means that when viewed through the outer glass 211 from the front side (i.e., the outdoor side) of the insulated door, at least a portion of the display component 420 blocks the visual projection area of ​​the second seal 320, preventing the user from directly seeing all or part of the second seal 320.

[0090] The first heat insulation cavity 220, originally a hollow area for heat insulation, has a portion of its space used to house the display component 420, achieving structural and functional integration. There are several options for fixing the display component 420. For example, the display component 420 can be directly adhered to the front surface of the middle glass 212 using optically transparent adhesive; this method provides reliable fixation without affecting light transmission. Another example is the installation of a positioning frame or slot on the front surface of the middle glass 212, embedding the display component 420 within it for easy disassembly and maintenance. The power supply and signal cables for the display component 420 need to be routed out from within the first heat insulation cavity 220. This can be done through pre-drilled wiring holes in the sealant or through pre-reserved notches on the glass edge, with proper sealing to prevent gas leakage.

[0091] Because the second seal 320 is located between the middle glass layer 212 and the inner glass layer 213, its position is relatively rearward compared to the first seal 310. When viewed from the front, the second seal 320 might originally be partially visible through the outer glass layer 211 and the middle glass layer 212, affecting the overall appearance. By placing the display assembly 420 within the first heat insulation cavity 220 and corresponding to the position of the second seal 320, the opaque portion (such as the back panel or circuit board) or the semi-transparent display area of ​​the display assembly 420 can be used to shield the second seal 320, making the visual effect of the front of the door more concise and unified.

[0092] The display component 420 is housed within the previously unused first insulation cavity 220, eliminating the need for additional display modules on the outside of the door. This results in a more compact overall structure and a cleaner appearance. The display component 420 also conceals the second seal 320, which might otherwise be visible through the glass, eliminating visual clutter and line interference. This creates a cleaner, more unified visual effect on the front of the door, meeting the aesthetic design requirements of high-end products.

[0093] Optionally, the display component 420 also shields the side of the first seal 310 facing the interior of the first insulation cavity 220.

[0094] In this embodiment, the side of the first seal 310 facing the interior of the first heat insulation cavity 220 refers to the surface of the first seal 310 exposed inside the first heat insulation cavity 220, i.e., the inner side of the seal. Since the first seal 310 is disposed between the outer glass 211 and the middle glass 212 and surrounds the periphery of the first heat insulation cavity 220, it forms an annular inner wall surface surrounding the visible area in the direction towards the center of the cavity. "The display assembly 420 also shields" means that, in addition to shielding the second seal 320, the display assembly 420 further covers or shields this inner side of the first seal 310, so that when viewed from the outside through the outer glass 211, the inner surface of the first seal 310 is obscured by the display assembly 420 and is either invisible or only partially visible.

[0095] By simultaneously shielding the inner surface of the first seal 310 with the display component 420, complete coverage of all sealing structures within the front visual area of ​​the glass module 200 is achieved. The display component 420 no longer merely blocks the second seal 320 behind it, but actively occupies the front space of the first heat insulation cavity 220, becoming the main visual element within the cavity. With the inner surface of the first seal 310 shielded by the display component 420, from any angle, the user sees only the edge or display area of ​​the display component 420, not the material surface of the seal.

[0096] Display component 420 covers all the sealing structures visible from the front, eliminating the visual borders formed by seals in traditional designs, giving the door a premium visual effect of a borderless or narrow-bezel display.

[0097] Optionally, the display assembly 420 includes a housing 421, which includes a first shielding surface 4211, a second shielding surface 4212, and a display surface 4213. The first shielding surface 4211 is attached to the side of the first seal 310 facing the first heat insulation cavity 220, the second shielding surface 4212 faces the portion of the second seal 320 that is misaligned with the first seal 310, and the display surface 4213 is connected to the first clearance surface and the second clearance surface.

[0098] The outer casing 421 serves to support and protect the display panel 4213 and related circuitry, while also providing a shielding function. The first shielding surface 4211 refers to the surface of the outer casing 421 used to adhere to the side of the first seal 310 facing the first heat insulation cavity 220. This surface is typically flat or has a shape that matches the inner surface of the first seal 310, achieving shielding of the inner surface of the first seal 310 through this adhesion. The second shielding surface 4212 is the surface facing the portion of the second seal 320 that is misaligned with the first seal 310. This surface is used to shield the area of ​​the second seal 320 visible from the front and is typically located on the rear or rear-side of the outer casing 421. The display surface 4213 refers to the surface of the outer casing 421 used to mount or expose the display panel 4213; this is the display surface 4213 that the user sees when observing through the outer glass 211. The display surface 4213 is connected to the first shielding surface 4211 and the second shielding surface 4212. These three surfaces together form an integral housing structure 421, which organically integrates the front, inner and rear areas of the display component 420.

[0099] This configuration achieves complete shielding of both seals. A single housing 421 simultaneously covers the inner side of the first seal 310 and the second seal 320, avoiding the structural complexity and assembly errors associated with using multiple independent shielding components, ensuring consistent and reliable shielding performance. As a single component, the housing 421 requires only one positioning and fixing to simultaneously achieve contact with the first seal 310 and shielding of the second seal 320, reducing assembly steps and improving production efficiency. The continuous surface of the housing 421 allows for a natural transition between the display area and the shielded area when viewed from the front, without noticeable seams, resulting in a cleaner and more refined appearance.

[0100] Optionally, the display component 420 also includes a light strip 422 disposed within the housing 421, which projects the pattern formed on the display surface 4213 when illuminated.

[0101] In this embodiment, the light strip 422 refers to a lighting assembly composed of multiple light-emitting elements arranged linearly, typically based on a flexible circuit board, which can be bent into various shapes as needed. "Set within the housing 421" means that the light strip 422 is installed within the internal cavity of the aforementioned housing 421, not directly exposed to the first heat insulation cavity 220, but rather enclosed or partially enclosed by the housing 421. The pattern formed on the display surface 4213 refers to graphics, text, symbols, or decorative patterns created on the display surface 4213 by means of printing, etching, spraying, or film application; these patterned areas can be translucent or semi-translucent. "Projecting the pattern" means that when the light strip 422 is lit, the light emitted by it passes through the patterned area on the display surface 4213, making the originally invisible pattern clearly visible, forming an illuminated icon or decorative effect.

[0102] With this setup, the luminous pattern formed when the LED strip 422 is lit can serve as a brand logo or function indicator to convey useful information to users, and can also serve as a decorative element of the door to enhance the product's aesthetics and technological feel.

[0103] Optionally, the door liner 120 is provided with a snap-fit ​​structure 121, which abuts against the periphery of the inner glass 213, and the space between the door liner 120 and the glass module 200 is filled with foam material.

[0104] The snap-fit ​​structure refers to the positioning and fixing structure set on the inner surface of the door liner 120, which can be in the form of continuous flanges, dispersed claws, elastic buckles, etc. "Abutting against the periphery of the inner glass 213" means that the front end of the snap-fit ​​structure forms physical contact with the rear surface edge area of ​​the inner glass 213, applying a forward supporting force to the glass module 200. "Filling the gap between the door liner 120 and the glass module 200 with foam material" refers to injecting and curing polyurethane foam and other insulation materials through a foaming process into the gap between the door liner 120 and the glass module 200, as well as throughout the entire installation space 130, ultimately permanently fixing the door liner 120, the glass module 200, and the door shell 110 together.

[0105] The snap-fit ​​structure can be designed as a continuous annular flange extending circumferentially along the door liner 120, with its front end face making face contact with the rear surface edge of the inner glass 213 to provide uniform support. In another embodiment, considering the elasticity and ease of manufacture of the door liner 120 material, the snap-fit ​​structure can employ multiple discrete snap-fit ​​claws distributed at the four corners of the door liner 120 and the center of each side, forming multi-point support. The snap-fit ​​claws can be L-shaped, T-shaped, or have reinforcing ribs to enhance their rigidity and load-bearing capacity.

[0106] In terms of assembly sequence, the pre-assembled glass module 200 is first inserted into the perforated window 111 from the inside of the door shell 110, so that the outer glass 211 is embedded in the window, and the support 300 abuts against the inner surface of the door shell 110. Then, the door liner 120 is fastened from the rear, so that the snap-fit ​​structure gradually approaches and finally abuts against the periphery of the inner glass 213. At this time, the glass module 200 is clamped by the door shell 110 from the front and the door liner 120 from the rear, achieving positioning. After the fastening is completed, the door liner 120 is fixedly connected to the edge of the door shell 110 by means of snaps or screws. The foaming process is carried out after the door liner 120 is fastened. Foaming material is injected into the installation space 130 through the injection port reserved on the door shell 110 or the door liner 120. The foaming material flows, expands, and solidifies within the space, gradually filling all gaps between the door liner 120 and the glass module 200, between the glass module 200 and the door shell 110, and between the door liner 120 and the door shell 110. After foaming, the solidified foam material, together with the snap-fit ​​structure, support 300, and seals, forms a unified whole. At this point, the snap-fit ​​structure is no longer merely a temporary fixing element but becomes part of the foam layer, tightly wrapped by the foam material. The combination of the foam material and the snap-fit ​​structure enhances the overall structural strength and further secures the position of the glass module 200.

[0107] This configuration improves the heat insulation of the glass module 200 at the sealing location, reducing or preventing condensation on the glass.

[0108] Optionally, the door shell 110 extends inward along the periphery of the hollow window 111 and is provided with a bending portion 112; the door liner 120 is engaged with the door shell 110 to form an installation space 130; the glass module 200 is disposed in the installation space 130 corresponding to the hollow window 111, and the bending portion 112 guides the glass module 200 when it is installed into the hollow window 111.

[0109] In this embodiment, the bending portion 112 refers to the structure formed by the door shell 110 bending inward along the periphery of the hollowed-out window 111, i.e., towards the installation space 130. Exemplarily, it can be integrally formed from the door shell 110 material itself through a stamping process, forming a continuous or discontinuous folded edge surrounding the window. The door liner 120 refers to the inner plastic part of the insulated door, which snaps into the door shell 110 to form a closed installation space 130. The glass module 200 refers to an independent functional unit pre-assembled from multiple layers of glass and surrounding support members 300, seals, etc., and is disposed within the installation space 130 corresponding to the hollowed-out window 111. "Guiding" refers to the bending portion 112 contacting the glass module 200 with its specific geometry during the installation of the glass module 200 into the door shell 110, guiding the glass module 200 to automatically align and smoothly enter the predetermined installation position, avoiding jamming or deflection.

[0110] In some alternative embodiments, the bend 112 is generally inclined inward into the installation space 130, and the angle between it and the front surface of the door shell 110, i.e., the guide angle, can be between 15° and 45°. The larger the angle, the stronger the guiding ability, but it may occupy more internal space; the smaller the angle, the smoother the guidance, but it may require a longer bend extension. In another alternative embodiment, the bend 112 can be designed as a curved surface, the radius of curvature of which is determined according to the size of the glass module 200 and the insertion angle. The curved surface guidance allows the glass module 200 to gradually adjust its posture during insertion, reducing impact.

[0111] The bend 112 can be a continuous structure, meaning it consists of a complete bend along the entire circumference of the cutout window 111. This continuous bend 112 provides omnidirectional guidance, correcting any deviation of the glass module 200 from any direction. Alternatively, the bend 112 can be a discontinuous structure, with guide sections only in critical areas, such as the four corners or the middle of each side, while other areas use straight bends or no bends. Discontinuous design saves material and reduces weight while maintaining the guiding function, and also allows space for other structures.

[0112] During assembly, the operator pushes the pre-assembled glass module 200 forward from the inside of the door shell 110, aligning it with the openwork window 111. The periphery of the glass module 200 first contacts the starting end of the bending section 112. As the pushing continues, the inclined or curved surface of the bending section 112 gradually guides the glass module 200 towards the center, correcting any initial positional deviations. When the glass module 200 reaches the predetermined depth, its periphery disengages from the bending section 112 and enters the final installation position. At this point, precise positioning and fixation are achieved by the contact between the support member 300 and the inner surface of the door shell 110, and the contact between the support column 123 and the door liner 120.

[0113] With this configuration, the guiding function of the bending part 112 allows for a certain initial positional deviation of the glass module 200 when it is placed into the door shell 110. This deviation is automatically corrected by the guide surface, improving assembly efficiency and fault tolerance. The bending part 112 contacts the support member 300 rather than directly contacting the glass, avoiding hard scratches and impacts on the glass edge by the metal bending part 112. The material properties of the support member 300 enable it to better adapt to sliding friction, reducing the risk of wear and damage.

[0114] Optionally, a guide gap 305 is formed between the support member 300 and the periphery of the outer glass 211, and the bent portion 112 is inserted into the guide gap 305.

[0115] In this embodiment, the area between the support member 300 and the periphery of the outer glass 211 refers to the region between the inner surface of the support member 300 and the outer edge surface of the outer glass 211. The support member 300 is disposed on the mounting step of the middle glass 212, with its inner surface facing the periphery of the outer glass 211, forming a certain gap between them. The guide gap 305 refers to the narrow space formed by the inner surface of the support member 300 and the outer periphery surface of the outer glass 211. This gap extends circumferentially along the glass module 200, and the radial distance between the inner surface of the support member 300 and the outer edge surface of the outer glass 211 accommodates the bent portion 112 of the door shell 110. The insertion of the bent portion 112 into the guide gap 305 means that during the installation of the glass module 200, the bent portion 112 provided on the door shell 110 along the periphery of the hollow window 111 is embedded in the guide gap 305, so that the bent portion 112 is sandwiched between the support member 300 and the outer glass 211, forming a plug-in fit relationship.

[0116] After the support member 300 is installed on the mounting step of the middle glass 212, a ring-shaped or partial gap is naturally formed between its inner surface and the outer peripheral surface of the outer glass 211. Exemplarily, the width of the guide slit 305 is slightly larger than the thickness of the bend 112, for example, between 0.5 and 1.5 mm, to allow the bend 112 to be smoothly inserted. In one embodiment, the bend 112 is flat, and the guide slit 305 is correspondingly a straight slit of equal width. In another embodiment, the bend 112 may have a slight curvature or bend, and the shape of the guide slit 305 is also designed accordingly as a matching curved surface or polygonal shape. This shape matching can further enhance the accuracy and stability of the guide.

[0117] The sliding fit of the bent portion 112 within the guide gap 305 effectively restricts the lateral displacement of the glass module 200 during installation, ensuring its straight-line movement along a predetermined trajectory, avoiding skewing and jamming, and significantly improving assembly accuracy and consistency. The guide gap 305 is jointly enclosed by the support member 300 and the outer glass layer 211. During insertion, the bent portion 112 contacts the support member 300 rather than directly contacting the glass, avoiding scratches and impacts on the glass edges from the metal bent portion 112, reducing the risk of glass breakage. Operators simply align the glass module 200 with the perforated window 111 and push it in; the bent portion 112 naturally enters the guide gap 305 without complex alignment adjustments. The fit between the bent portion 112 and the guide gap 305 forms a tortuous sealing path, effectively preventing foam material from seeping into the visible area from the gap between the door shell 110 and the glass module 200, ensuring the appearance quality of the finished product.

[0118] Optionally, the support member 300 and the periphery of the outer glass 211 form an annular guide gap 305, and the door shell 110 is provided with an annular bending part 112 along the periphery of the hollow window 111, and the annular bending part 112 is inserted into the annular guide gap 305.

[0119] In this embodiment, the annular guide gap 305 refers to a closed gap structure that is continuously extended along the entire circumference of the glass module 200, formed by the inner surface of the support member 300 and the outer peripheral surface of the outer glass 211. This gap surrounds the glass, forming a complete annular channel. The annular bend 112 refers to a continuously closed folded edge structure formed by the door shell 110 bending inward along the entire periphery of the hollow window 111. Its shape matches the outline of the hollow window 111 and is usually rectangular. The insertion of the annular bend 112 into the annular guide gap 305 means that the entire annular fold of the door shell 110 is completely embedded in the annular guide gap 305 of the glass module 200, forming a full circumferential fit between the bend 112 and the guide gap 305.

[0120] The fit of the annular bend 112 within the annular guide gap 305 simultaneously constrains the displacement of the glass module 200 in four directions and at four corners, ensuring it maintains the correct posture and position throughout installation, and uniformly correcting any initial deviation from its origin. The continuous labyrinthine path formed by the annular bend 112 and the annular guide gap 305 effectively prevents the seepage of foaming material, creating a reliable circumferential sealing barrier and fundamentally avoiding the risk of foaming material leakage into visible areas. After the annular bend 112 is inserted into the annular guide gap 305, a tight mechanical bond is formed between the door shell 110 and the glass module 200, enhancing the door's resistance to deformation in the thickness direction and making the overall structure more stable. The annular bend 112 is completely hidden within the guide gap 305 and is not visible from the front, resulting in a smoother and simpler junction between the door shell 110 and the glass, improving the overall aesthetics of the product.

[0121] Optionally, the bend 112 extends inward from the door shell 110 toward the door liner 120, and the end of the bend 112 forms an inclined guide bevel 1121 to guide the outer glass 211 into the cutout window 111.

[0122] In this embodiment, the extension of the bent portion 112 from the door shell 110 toward the door liner 120 refers to the bent structure provided on the door shell 110 along the periphery of the openwork window 111. Its extension direction is from the inner surface of the door shell 110 toward the door liner 120, forming a protruding structure facing the rear of the door. The end of the bent portion 112 refers to the final end of the extended bent portion 112, i.e., the end closest to the door liner 120. The inclined guide slope 1121 refers to the slope structure provided at the end of the bent portion 112. This slope is inclined at an angle relative to the main body of the bent portion 112, and its inclination direction is generally from the outside to the inside, gradually widening the opening to form a funnel-shaped guide surface. The term "guiding the outer glass 211 into the hollow window 111" means that when the glass module 200 is installed into the door shell 110, the periphery of the outer glass 211 first contacts the guide slope 1121, and gradually moves to the correct position under the guidance of the slope, and finally smoothly enters the hollow window 111.

[0123] With this setup, the inclined plane 1121 provides a tolerant alignment guide for the initial insertion of the glass module 200. Even if there is a certain positional deviation between the outer glass 211 and the hollow window 111, it can be automatically corrected by the inclined plane, without the need for precise alignment by the operator, thus improving assembly efficiency and fault tolerance.

[0124] Optionally, the door liner 120 is provided with irregularly shaped positioning holes, and the door shell 110 is provided with positioning elements, which have a free range of movement in the irregularly shaped positioning holes.

[0125] In this embodiment, the irregular positioning hole refers to a non-circular hole structure provided on the door liner 120. Its specific shape can be an oblong hole, elliptical hole, waist-shaped hole, cross-shaped hole, or other irregular shape, designed to provide a larger clearance than a circular hole in one or more directions. The positioning element refers to a protruding structure provided on the door shell 110 that mates with the irregular positioning hole. It can be a protrusion or boss integrally formed during the stamping of the door shell 110, or an independent part welded or riveted to the door shell 110. "Free movement" means that when the positioning element is inserted into the irregular positioning hole, there is a certain gap between them in a specific direction, allowing the door liner 120 to undergo slight displacement relative to the door shell 110 in that direction without being rigidly constrained by the positioning element.

[0126] The irregularly shaped positioning holes allow the door liner 120 to make a small displacement relative to the door shell 110 in a specific direction, which compensates for the cumulative effect of the dimensional fluctuations of various components such as the door shell 110, door liner 120, and glass module 200, and avoids assembly difficulties and stress concentration caused by the superposition of tolerances.

[0127] Optionally, the insulated door also includes a decorative cover 550, which is located at the end of the door shell 110 after it is connected to the door, and a wiring cavity is formed inside the decorative cover.

[0128] In this embodiment, the decorative cover refers to a cover-like structural component installed at the end of the insulated door, typically made of plastic or metal. Its main function is to cover the exposed end interface after the door shell 110 and door liner 120 are connected, enhancing the overall aesthetics of the door. The end after the door shell 110 and door liner 120 are connected refers to the top, bottom, or left and right edge portions of the door. In these portions, the folded edge of the door shell 110 interlocks with the edge of the door liner 120, forming the boundary of the door. The "wiring cavity" refers to a hollow channel formed inside the decorative cover and extending along its direction. This channel is used to accommodate and guide electrical wiring harnesses 430, such as power lines for heating elements, signal lines for display components 420, and power lines for LED strips 422. Wiring harness 430 refers to an electrical connection circuit composed of multiple wires.

[0129] With this design, the connectors of wire harness 430 will not be submerged during the foaming process, which facilitates the connection and maintenance of wire harness 430.

[0130] Optionally, the installation space 130 forms four foaming zones along the circumference of the glass module 200; the insulated door also includes a guide pipe 500, which is disposed in one of the foaming zones. The guide pipe 500 has one inlet and multiple outlets, through which the foaming material is guided to the multiple zones.

[0131] Area; feed pipe 500, located in one of the foaming areas, feed pipe 500 has one inlet and multiple outlets, through which foaming material is guided to multiple areas.

[0132] In this embodiment, the "four foaming zones" refer to the cavity areas formed circumferentially along the glass module 200, located between the door shell 110 and the door liner 120. Specifically, these include four areas: above, below, left, and right of the glass module 200. These areas will be filled with foaming material during foaming. The guide pipe 500 refers to a specially designed pipe structure for guiding the flow of foaming material, which has one inlet and multiple outlets. The inlet is the port connecting the guide pipe 500 to external foaming equipment, through which the foaming material enters the guide pipe 500. The outlets are multiple openings on the guide pipe 500 through which the foaming material flows out and enters various foaming zones. "Guiding the foaming material to multiple zones through the guide pipe 500" means utilizing the diversion effect of the guide pipe 500 to evenly or as needed distribute the foaming material injected from one inlet to multiple different foaming zones, achieving one-time injection and multi-point filling.

[0133] In conventional designs, the foaming material is typically injected through a single inlet on the door shell 110 or door liner 120, relying on its own fluidity and expansion force to naturally fill the entire installation space 130. However, for the multi-layered glass door body described in this disclosure, due to the presence of the glass module 200, the installation space 130 is divided into several relatively independent areas—the upper area, the lower area, the left area, and the right area. These areas are connected only by narrow gaps, making it difficult for the foaming material to simultaneously and evenly fill all areas before foaming is complete after injection from a single inlet. This often results in some areas being underfilled (lacking material) or overfilled, affecting thermal insulation performance and appearance quality.

[0134] The insulation door provided in this embodiment can actively divert foam material injected from one inlet to multiple different areas by setting a guide pipe 500 with multiple outlets in one of the foaming areas, thereby achieving simultaneous filling of multiple areas. This multi-area injection method improves the uniformity of foam material distribution.

[0135] In one alternative embodiment, the guide tube 500 can be designed as T-shaped or Y-shaped, i.e., one inlet connects to two or three outlets. In a preferred embodiment, the guide tube 500 is located in the top foaming area of ​​the door body, i.e., the area above the glass module 200. The top area is usually spacious, which facilitates the accommodation of the guide tube 500 structure; after the foam material is injected from the top, it flows naturally downward under gravity, which is beneficial for filling the lower area; the top area does not involve complex structures such as hinges and door seals, and has a high degree of design freedom. In another embodiment, the guide tube 500 can also be located in the bottom area, utilizing the upward expansion property of the foam material to fill the upper area.

[0136] When the foaming material flows within a pipe, its flow resistance is related to factors such as pipe length, diameter, and number of bends. To ensure a balanced discharge rate at each outlet, outlets closer to the inlet are designed with smaller discharge rates, while those farther from the inlet are designed with larger discharge rates to compensate for friction loss and achieve a balanced final flow rate at each outlet. In another embodiment, a flow-dividing structure such as a flow divider cone or guide plate can be installed within the feed pipe 500 to guide the foaming material to be distributed evenly.

[0137] In one alternative embodiment, the guide tube 500 can be a standalone component, placed within the corresponding foaming area before foaming and fixed by a positioning structure. This standalone design offers the advantage of ease of replacement and adjustment, making it suitable for multi-variety, small-batch production. In another embodiment, the guide tube 500 can be integrally molded with the door liner 120 or the door shell 110; for example, the guide tube 500 structure can be directly fabricated during the injection molding of the door liner 120, reducing assembly steps and improving production efficiency.

[0138] The insulated door provided in this embodiment actively diverts foaming material injected from one inlet to multiple foaming areas around the glass module 200 via the material guide pipe 500. This allows each area to begin filling simultaneously, avoiding the filling sequence differences and uneven filling problems caused by traditional single-point injection, thus significantly improving foaming quality. For the installation space 130, which is divided into multiple relatively independent areas by the glass module 200, the diversion effect of the material guide pipe 500 ensures that even if the passage between areas is narrow, each area can receive sufficient and uniform foaming material filling, avoiding quality defects such as insufficient material and cavities. Operators only need to inject material through one injection port, eliminating the need to operate separately for different areas, reducing process steps and operation time, improving production efficiency, and reducing human error that may be caused by multiple injections.

[0139] Optionally, the insulated door has two long sides and two short sides, and the installation space 130 forms a first foaming area 131 and a second foaming area 132 corresponding to the two short sides, and a third foaming area 133 and a fourth foaming area 134 corresponding to the two long sides; wherein, the guide pipe 500 is preset in the first foaming area 131.

[0140] In this embodiment, the long sides refer to the two sides of the insulation door in the height direction; the short sides refer to the top and bottom sides of the insulation door in the width direction. The first foaming region 131 and the second foaming region 132 correspond to the foaming cavities formed at the top and bottom short sides, respectively; the third foaming region 133 and the fourth foaming region 134 correspond to the foaming cavities formed at the left and right long sides, respectively. The guide pipe 500 is preset in the first foaming region 131, which means that the guide pipe 500 is pre-arranged in one of the top or bottom short side regions, such as the top region, as the initial injection and diversion point of the foaming material.

[0141] The short side area is usually relatively regular in shape, which makes it easy to install and fix the guide tube 500; at the same time, the short side area is located at both ends of the door body, and after the foaming material is injected through it, it can flow from top to bottom under the action of gravity, which is conducive to filling the long side area.

[0142] After the foaming material is injected from the short side, it flows naturally towards the long side and the other short side under the influence of gravity. The reasonable filling path facilitates uniform filling. The regular space of the short side area makes it easy to arrange the guide pipes 500 and to set up multiple outlets pointing in different directions. The structure is simple and easy to manufacture. The foaming material is distributed from the center of the short side to both long sides, making the filling conditions on the left and right sides symmetrical, which helps to ensure the uniformity of foam density and quality on both sides.

[0143] Optionally, the feed pipe 500 includes a feed pipe 510, a first branch pipe 520, and a second branch pipe 530, wherein: the feed pipe 510 has a first end adapted to be connected to an external feed pipe; the first branch pipe 520 has a first end connected to the second end of the feed pipe 510, and the second end extends to the third foaming region 133; the second branch pipe 530 has a first end connected to the second end of the feed pipe 510, and the second end extends to the fourth foaming region 134.

[0144] In this embodiment, the feed pipe 510 is the part of the guide pipe 500 that is directly connected to the external feed pipe. Its first end has an inlet for receiving foaming material injected from the foaming equipment. The first branch pipe 520 and the second branch pipe 530 are two branch pipes that branch off from the feed pipe 510 and extend in different directions from the guide pipe 500. The second end of the first branch pipe 520 extending to the third foaming region 133 means that the outlet end of the first branch pipe 520 is located within the foaming region corresponding to one long side of the door body; the second end of the second branch pipe 530 extending to the fourth foaming region 134 means that the outlet end of the second branch pipe 530 is located within the foaming region corresponding to the other long side of the door body. The second end of the feed pipe 510 is the bifurcation point where the feed pipe 510 connects to the two branch pipes; the foaming material flows through this point and then splits into the two branch pipes.

[0145] This bi-branched feed pipe 500 structure is an optimized design for doors with two long-side foaming regions. In one embodiment, the feed pipe 510 is located in the top short-side region, extending along the thickness direction of the door body or at an angle to facilitate connection with an external feed pipe. The lengths of the first branch pipe 520 and the second branch pipe 530 depend on the distance from the bifurcation point of the feed pipe 510 to their respective target foaming regions. Since the two long sides are typically symmetrically distributed, the lengths of the two branch pipes can be designed to be equal to ensure similar flow resistance, thereby achieving a balanced distribution of foam material on both sides. At the bifurcation point, a flow-diverting structure can be provided to guide the foam material smoothly into the two branch pipes, reducing eddies and resistance. Specific discharge structures can be provided at the outlet ends of the two branch pipes. For example, the outlet can be set as an angled or flared opening to expand the spray range of the foam material; flow-diverting ribs can be provided at the outlet to further disperse the foam material and improve filling uniformity. The diameter of the two branch pipes can be designed according to the required flow rate, typically the same as or slightly smaller than the diameter of the feed pipe 510.

[0146] The foaming material enters through a single inlet, is then diverted and simultaneously delivered to the left and right long-side areas, ensuring synchronized foaming processes on both sides and avoiding density differences caused by sequential filling. The Y-shaped or T-shaped branch design is simple in structure, easy to manufacture and install, and has low flow resistance, which helps maintain the fluidity and filling pressure of the foaming material. The symmetrical design of the branch pipe length and diameter ensures consistent flow conditions on both sides, promoting uniform foam density and filling effect, and improving the overall thermal insulation performance of the door.

[0147] Optionally, a flow divider 540 is provided at the end of the feed pipe 510, and the first branch pipe 520 and the second branch pipe 530 are located on both sides of the flow divider 540, respectively, so that the foaming material is distributed to the first branch pipe 520 and the second branch pipe 530 through the flow divider.

[0148] In this embodiment, the end of the feed pipe 510 refers to the part where the feed pipe 510 connects to the first branch pipe 520 and the second branch pipe 530, i.e., the bifurcation point on the flow path of the foaming material. The diverter plate refers to a plate-like structure disposed at this bifurcation point, which can be a flat plate, an arc-shaped plate, or a component with a specific flow-guiding shape. Its function is to evenly or proportionally distribute the foaming material flowing from the feed pipe 510 to the two branch pipes. "Distributing the foaming material to the first branch pipe 520 and the second branch pipe 530 through the diverter plate" means that when the foaming material flows through the diverter plate, under the guidance and division of the plate surface, it is divided into two streams that enter the two branch pipes respectively, thus achieving flow diversion.

[0149] The manifold is designed to optimize the flow of foam material at the bifurcation point. In a simple tee structure without a manifold, the foam material is prone to eddies, flow deviation, or uneven flow velocity when flowing through the bifurcation point, resulting in inconsistent feed rates to the two branch pipes and affecting the uniformity of filling in the foaming areas on both sides. The manifold effectively improves this problem. The shape of the manifold can be designed as needed. In one embodiment, the manifold can be wedge-shaped or pointed, with its tip facing the inflow direction of the feed pipe 510, smoothly dividing the foam material flow into two streams. In another embodiment, the manifold can have an arc-shaped surface, guiding the foam material to smoothly turn and enter the branch pipe, reducing flow resistance. The surface of the manifold should be as smooth as possible to reduce foam material adhesion and accumulation. The installation position and angle of the manifold need to be precisely set. Typically, the manifold should be positioned on the extension line of the feed pipe 510 axis, with its plane of symmetry aligned with the bifurcation line of the two branch pipes to ensure uniform flow distribution on both sides. The width of the manifold should be slightly larger than the diameter of the feed pipe 510 so that it can completely cover the incoming flow section.

[0150] The manifold smoothly divides the foaming material flow within the feed pipe 510 into two streams, preventing flow deviation and eddies. This ensures that both branch pipes receive an equal or proportional amount of foaming material, resulting in more consistent filling density in the foaming areas on both sides. The manifold's guiding effect makes the foaming material flow more smoothly at the bifurcation point, reducing energy loss and helping to maintain the fluidity and filling pressure of the foaming material. The manifold eliminates dead zones at the bifurcation point, reducing the possibility of foaming material stagnation and accumulation, and improving the reliability of the foaming process.

[0151] Optionally, the feed pipe 510 is vertically arranged with its first end facing upward, the first branch pipe 520 is horizontal and slopes downward from the first end to the second end, and the second branch pipe 530 extends horizontally and slopes downward from the first end to the second end.

[0152] In this embodiment, the vertical arrangement of the feed pipe 510 means that the feed pipe 510 is arranged along the height of the door. "First end upward" means that the upper end of the feed pipe 510 serves as the inlet, connecting to the external conveying pipe, through which the foaming material flows in from top to bottom. "First branch pipe 520 horizontal and downward sloping from the first end to the second end" means that the first branch pipe 520 extends horizontally, but is not completely horizontal; rather, its height gradually decreases from the end connected to the feed pipe 510 towards the end of the third foaming region 133, forming a certain downward sloping angle. "Second branch pipe 530 horizontal and downward sloping from the first end to the second end" means that the second branch pipe 530 also extends horizontally and slopes downward from the connecting end to the end.

[0153] This top-feed, downward-sloping arrangement fully considers the auxiliary effect of gravity on the flow of the foaming material. The feed pipe 510 is vertically positioned with its first end facing upwards, allowing the foaming material to flow naturally downwards under gravity, smoothly entering the branch pipes without additional pressure. The downward-sloping design of the two branch pipes allows the foaming material to continue flowing forward within the branch pipes under the influence of gravity, helping to overcome flow resistance and ensuring that the foaming material reaches the end of the branch pipes furthest from the feed inlet. The tilt angle needs to be optimized based on the gate size and the flowability of the foaming material. If the angle is too small, the gravity assistance will be insufficient; if the angle is too large, it may cause the foaming material to flow too fast or accumulate at the end of the branch pipes. Typically, the tilt angle can be controlled within the range of 3° to 15°.

[0154] This configuration fully utilizes gravity to assist the flow of the foaming material, reducing the pressure requirements on the foaming equipment and making the foaming process more stable and controllable. The foaming material can smoothly reach the end of the branch pipe far from the inlet, avoiding the problem of insufficient filling at the far end due to excessive flow resistance.

[0155] Optionally, the door shell 110 and / or door liner 120 are provided with a plurality of vent holes.

[0156] In this embodiment of the disclosure, an exhaust hole refers to a small through hole provided on the door shell 110 and / or door liner 120, with a diameter between 1 and 5 mm, used to discharge gas within the installation space 130 during the foaming process. The number of exhaust holes is two or more, and can be multiple openings on one or more surfaces.

[0157] The vents are designed to address the issue of gas release during the foaming process. When the foaming material is injected into the installation space 130 and the foaming reaction begins, gas is generated and expands. Simultaneously, the existing air within the installation space 130 needs to be expelled. If the gas cannot be expelled in time, defects such as pores, voids, or surface bulges will form within the foam layer, affecting insulation performance and appearance quality. The placement of the vents needs to be designed based on the areas where gas tends to accumulate. Typically, gas tends to accumulate in the top area of ​​the door body and in areas far from the injection port. Therefore, vents can be placed at the top edge of the door shell 110, the top area of ​​the door liner 120, and the far ends of the long sides.

[0158] This design allows for the smooth discharge of gas during the foaming process, avoiding defects such as voids and bulges in the foam layer caused by gas accumulation, thus improving foaming quality and thermal insulation performance. The multiple vents allow gas to be discharged evenly from different areas, which is beneficial for the uniform filling and expansion of the foam material within the installation space 130.

[0159] Optionally, the vent holes are covered with breathable tape.

[0160] In this embodiment of the disclosure, "applying" refers to covering the outer surface of the vent hole with breathable tape by adhesive bonding, so that the tape is tightly adhered to the surface of the door shell 110 or the door liner 120. Breathable tape is a strip-shaped material that has air-permeable properties but can block the passage of liquid substances. It is usually composed of a substrate and a pressure-sensitive adhesive layer. Its microporous structure allows gas molecules to pass through, but has a blocking effect on liquid foaming materials.

[0161] For example, breathable tapes include PTFE microporous membrane tapes, high-temperature resistant nonwoven tapes, etc., which maintain structural stability during the foaming process and will not fail due to melting or deformation caused by heat. When applying the tape, ensure that it completely covers the vent holes, and that the edges are tightly adhered to the surface of the door shell 110 or door liner 120, without air bubbles or curling, to prevent the foaming material from seeping in from the edges. After foaming is complete, the breathable tape can be retained as a permanent seal or removed.

[0162] By applying breathable tape to the vent, gas can be smoothly discharged from the installation space 130, while the liquid foam material is effectively blocked by the tape. This ensures effective venting while preventing waste and pollution caused by foam material leakage. With the breathable tape blocking the flow, the diameter of the vent can be appropriately increased, reducing processing difficulty, and achieving leak-proof function without the need for a complex labyrinth structure.

[0163] Optionally, the insulated door also includes a decorative cover 550, which is located at the end of the door shell 110 after it is connected to the door liner 120. The decorative cover is provided with a material inlet, and the material guide tube 500 is pre-fixed to the material inlet.

[0164] In this embodiment, the decorative cover refers to a cover-like structural component installed at the end of the insulated door, typically made of plastic or metal, used to cover the exposed end interface after the door shell 110 and door liner 120 are connected, enhancing the door's aesthetics. The injection port refers to the opening on the decorative cover, used to connect with the feed pipe of the external foaming equipment, through which the foaming material is injected. The pre-fixed guide pipe 500 to the injection port means that the inlet end of the guide pipe 500 is pre-connected and fixed to the injection port on the decorative cover, allowing the decorative cover to simultaneously perform the dual functions of end decoration and foaming material injection.

[0165] By pre-fixing the guide tube 500 to the injection port of the decorative cover, functional integration and assembly simplification are achieved. In traditional designs, the injection port is usually directly opened on the door shell 110 or door liner 120, and the guide tube 500 needs to be installed and positioned separately. In this embodiment, the injection port is transferred to the decorative cover, and the guide tube 500 and the decorative cover are pre-assembled into a single component, reducing the number of openings on the door shell 110 or door liner 120 and simplifying the structure. The guide tube 500 and the decorative cover can be fixed by snap-fit ​​connection, threaded connection, or plug-in fit. In one embodiment, the inlet end of the guide tube 500 is provided with an annular flange or claw, and the inner side of the injection port of the decorative cover is provided with a corresponding groove. During assembly, the guide tube 500 is inserted into the injection port and rotated or pressed to make the claw engage with the groove for fixation. This connection method is quick to assemble and requires no tools. After the decorative cover is installed at the end of the door body, the guide tube 500 enters the predetermined foaming area without the need for separate positioning adjustment. After the material is injected, the injection port can be sealed with a cap, which can be integrated with the decorative cap or be a separate accessory.

[0166] By pre-fixing the guide tube 500 to the injection port of the decorative cover, the decorative cover simultaneously serves the dual functions of end decoration and foam injection, reducing the number of parts and simplifying the door structure. The guide tube 500 and the decorative cover are pre-assembled as a component, and the positioning of the guide tube 500 is completed at the same time as the installation of the decorative cover, eliminating the need for separate installation and adjustment and improving assembly efficiency. The injection port is located on the decorative cover, and can be sealed with a cap after foaming, thus hiding or decoratively treating the injection port without affecting the overall aesthetics of the door. If it is necessary to inspect the guide tube 500 or clean the injection port, only the decorative cover needs to be removed without damaging other structures of the door.

[0167] Optionally, the insulation door also includes a baffle, which is installed at the injection port after the insulation door has finished foaming.

[0168] In this embodiment, the baffle refers to an independent cap-like component used to seal the injection port, made of plastic or rubber material, and its shape matches the injection port. Setting the baffle at the injection port after the insulation door foaming process is completed means that after the foaming process is finished and the foamed material has cured, the baffle is installed at the injection port to seal it. The baffle and the aforementioned decorative cover can be separate structures, or the baffle can be part of the decorative cover.

[0169] During the foaming process, the injection port needs to remain open for connection to the foaming equipment. After foaming, the injection port becomes an opening on the door; if not sealed, it will affect the appearance and may become a channel for moisture or dust to enter. The connection between the cover and the injection port can be achieved through snap-fit, threaded connection, or interference fit. In one embodiment, the cover has elastic claws, and the inner wall of the injection port has a groove; after the cover is pushed in, the claws automatically engage with the groove to secure it. In another embodiment, the cover can be screwed into the injection port, providing a secure connection and easy disassembly. For disposable covers, permanent sealing can be achieved through welding or bonding. The material and color of the cover can be consistent with the decorative cover to ensure the overall aesthetics of the door end. In some embodiments, the cover surface can be decorated with brand logos or decorative patterns, making it part of the door's exterior design.

[0170] By setting a cover to seal the injection port after foaming, the surface of the door end is flat and continuous with no obvious openings, thus improving the appearance quality of the product.

[0171] Optionally, the insulation door also includes an injection pipe 560, which is removably disposed at the injection port.

[0172] The injection pipe is a temporary conduit used to guide foaming material from external foaming equipment into the interior of the door body. One end connects to the foaming equipment, and the other end is inserted into or connected to the injection port. A removable configuration means that the injection pipe is installed at the injection port during the foaming process and can be detached from the door body after foaming is complete, not becoming a permanent integral structure with the door body. This detachable design means that the injection pipe can be reused in the foaming production of multiple doors.

[0173] In one embodiment, the injection tube and the injection port are fitted with a tapered surface or an elastic interference fit. During insertion, friction is used to fix and seal the tube, and it can be easily pulled out after foaming is complete. In another embodiment, a quick-connect fitting design can be used, with an elastic latch at the end of the injection tube that automatically locks after insertion into the injection port. Pressing the release button allows for easy removal.

[0174] With this configuration, a single injection tube can be reused for multiple gates, avoiding the waste of materials associated with configuring a permanent injection tube for each gate.

Claims

1. An insulated door for refrigeration equipment, characterized in that, include: The door shell has a perforated window. The door liner, which engages with the door shell to form an installation space; A glass module is disposed in the installation space corresponding to the hollowed-out window; The glass module includes: The glass body includes an outer glass layer, a middle glass layer, and an inner glass layer arranged sequentially, wherein the size of the middle glass layer exceeds that of the outer glass layer to form an installation step, and the outer glass layer is at least partially embedded in the perforated window. A support member is provided on the mounting step, with the outward side of the support member abutting against the inward side of the door shell.

2. The heat-insulating door according to claim 1, characterized in that, Multiple sides of the middle glass extend outward beyond the outer glass to form annular steps, and the support member is arranged in a ring shape on the annular steps.

3. The heat-insulating door according to claim 1, characterized in that, The glass module also includes: The first heating element is disposed on the side of the support member close to the outer glass.

4. The heat-insulating door according to claim 3, characterized in that, The support member has a hollow structure, and a first groove is formed on the side of the support member facing the outer glass layer. The first heating element is disposed in the first groove.

5. The heat-insulating door according to claim 4, characterized in that, The support member facing the door shell includes an abutment portion that serves as the outer wall of the hollow structure and a sealing portion that extends beyond the hollow structure. The sealing portion is elastically deformable to fit tightly against the inward side of the door shell.

6. The heat-insulating door according to claim 5, characterized in that, A second groove is provided at the connection position between the abutment part and the sealing part; The glass module also includes: The second heating element is disposed in the second groove.

7. The heat-insulating door according to any one of claims 1 to 6, characterized in that, A first heat insulation cavity is formed between the outer glass layer and the middle glass layer, and a second heat insulation cavity is formed between the middle glass layer and the inner glass layer. The thickness of the second heat insulation cavity is greater than the thickness of the first heat insulation cavity.

8. The heat-insulating door according to claim 7, characterized in that, The thickness of the first heat insulation cavity is greater than or equal to 12 mm and less than or equal to 16 mm.

9. The heat-insulating door according to any one of claims 1 to 6, characterized in that, The middle glass layer is provided with a heating film layer.

10. The heat-insulating door according to any one of claims 1 to 6, characterized in that, The dimensions of the middle glass layer exceed the dimensions of the inner glass layer; Insulated doors also include: A support column is provided on the door liner, and the free end of the support column abuts against the portion of the middle glass that extends beyond the inner glass to pre-fix the glass module.

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