Vacuum glass door body, preparation method thereof and refrigeration equipment

Abstract

The invention provides a vacuum glass door body, a preparation method thereof and refrigeration equipment. The door body comprises a door frame assembly and a glass assembly. The door frame assembly comprises a door frame body and a visible area defined by the door frame body. The edge of the glass assembly is fixed to the inner wall of the door frame body. The glass assembly comprises first glass and vacuum glass which are arranged in a stacked mode. A first heat preservation cavity is formed between the first glass and the vacuum glass, a second heat preservation cavity is formed in the vacuum glass, the second heat preservation cavity is a vacuum layer, the vacuum degree is smaller than 5 * 10 < 2 > Pa, the U value is smaller than 0.6 W / m < 2 >. Ka, and the gap thickness is smaller than 0.5 mm. The parameters of the vacuum layer enable the vacuum glass to be superior to the traditional hollow glass, the heating wire is combined with the sealing structure, water vapor invasion can be avoided, and the aluminum alloy fixing piece and the limiting groove ensure that the vacuum glass is free of deformation after being used for a long time. The refrigeration equipment door body is high in performance and long in service life, and is suitable for scenes such as wine cabinets and refrigerators with strict temperature control requirements.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and more specifically to a vacuum glass door body, a preparation method thereof, and a refrigeration device. Background Art

[0002] Traditional refrigeration equipment (such as refrigerators and freezers) often use doors filled with foam to maintain insulation. While this type of door structure offers good insulation, its opaque construction prevents users from directly observing the contents of the equipment.

[0003] Currently, transparent doors in wine cabinets, display cabinets, and other equipment commonly utilize hollow glass doors, consisting of a door frame and three panes of glass. This structure creates two sealed chambers, typically filled with a gas such as argon. This design overcomes the opacity of traditional foam doors, allowing users to clearly see the contents from the outside. This reduces the exchange of hot and cold air caused by frequent door openings to search for items, thereby reducing energy consumption.

[0004] While existing insulated glass doors offer excellent visibility and reduce energy consumption when opened, the glass itself conducts heat very quickly. This results in heat easily transferring through the door, causing temperature fluctuations inside the refrigeration equipment and resulting in relatively poor insulation performance. Summary of the Invention

[0005] To solve the problem that the existing hollow glass transparent door body has a high thermal conductivity of the glass material itself, which makes heat easily transferred through the glass door body, causing the internal temperature of the refrigeration equipment to fluctuate and its thermal insulation performance is relatively poor.

[0006] A first aspect of the present application provides a vacuum glass door body, comprising: a door frame assembly and a glass assembly;

[0007] The door frame assembly includes: a door frame body and a visible area enclosed by the door frame body;

[0008] The edge of the glass assembly is fixed to the inner wall of the door frame body, and the glass assembly includes: a first glass and a vacuum glass that are stacked;

[0009] The first glass is arranged on the outside of the vacuum glass, a first heat preservation chamber is formed between the first glass and the vacuum glass, a second heat preservation chamber is formed inside the vacuum glass, and the second heat preservation chamber is a vacuum layer with a vacuum degree less than 5×10 2 Pa, U value < 0.6W / m 2 .Ka, gap thickness <0.5mm.

[0010] In a feasible implementation, a limiting groove is provided on the inner wall of the door frame body;

[0011] The first glass is fixed to the outer wall of the door frame body through an adhesive, and the vacuum glass is fixed to the inner wall of the door frame body through the limiting groove.

[0012] In a feasible implementation, the thickness of the first heat preservation chamber is 10-20 mm, and the thickness of the second heat preservation chamber is 0.3-1 mm;

[0013] The area of ​​the first glass is larger than the area of ​​the vacuum glass.

[0014] In a feasible implementation, it further includes: a heating wire and a fixing member;

[0015] The heating wire is arranged at the edge of the vacuum glass;

[0016] The fixing members are arranged on both sides of the door frame body, and the material of the fixing members is aluminum alloy;

[0017] The door frame body further includes an end cover, which is arranged at an edge of the door frame body to form a door handle.

[0018] In a feasible implementation, the door frame assembly further includes a door frame spacer, and the door frame spacer includes: a partition strip and a sealing member;

[0019] The partition strip is arranged on a side of the door frame body close to the vacuum glass, and the sealing member is arranged on a side of the partition strip away from the vacuum glass and a side close to the vacuum glass.

[0020] In a feasible implementation, the shape of the visible area is a rectangle;

[0021] The shapes of the first glass and the vacuum glass are both rectangular, and the length and width of the first glass are both larger than 2-3% of the length and width of the vacuum glass.

[0022] A second aspect of the present application provides a refrigeration device, comprising a box body and the vacuum glass door body described in any one of the above items;

[0023] The vacuum glass door is rotatably connected to one side of the box;

[0024] A plurality of partitions are provided in the box body, and the partitions divide the box body into a plurality of heat preservation areas.

[0025] In a feasible implementation, the door frame spacers of the vacuum glass door body are arranged corresponding to the partitions.

[0026] A third aspect of the present application provides a method for preparing a vacuum glass door body, which is used to prepare any of the above vacuum glass door bodies, comprising the following steps:

[0027] Enclosing the door frame body to form a visual area;

[0028] The two layers of glass are sealed together to obtain vacuum glass, and a second heat preservation chamber is formed. The vacuum degree of the second heat preservation chamber is less than 5×10 2 Pa, U value is less than 0.6W / m 2 .Ka, gap thickness is less than 0.5mm;

[0029] Laying a first glass and the vacuum glass so that the first glass is located outside the vacuum glass and a first heat preservation chamber is formed between the first glass and the vacuum glass;

[0030] The edge of the glass assembly is fixed to the inner wall of the door frame body so that the glass assembly covers the viewing area.

[0031] In a feasible implementation, the sealing process is: using alloy solder to seal the four sides of the vacuum glass in a high vacuum environment.

[0032] From the above content, it can be seen that the present application provides a vacuum glass door body and its preparation method and refrigeration equipment, the U value of the high vacuum layer of the second insulation chamber is less than 0.6W / m 2 ·K, vacuum degree <5×10-2Pa, which is better than traditional insulating glass, and the heating wire is combined with the sealing structure to prevent water vapor intrusion. The use of aluminum alloy fixings and limiting grooves ensures long-term use without deformation. The multi-insulation area design of the refrigeration equipment combined with the high-sealing door body can greatly reduce energy consumption. This application achieves high performance and long life of the refrigeration equipment door body through collaborative innovation of materials, structures, and processes. It is suitable for scenes with strict temperature control requirements such as wine cabinets and freezers. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the implementation of this application, and together with the specification, are used to explain the principles of the embodiments of this application. Obviously, the drawings described below are only some embodiments of the implementation of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort.

[0034] Figure 1 1 is a schematic diagram of the front structure of a vacuum glass door body shown in an embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the back structure of the vacuum glass door body shown in an embodiment of the present application;

[0036] Figure 3 1 is a schematic diagram of the side structure of a vacuum glass door body shown in an embodiment of the present application;

[0037] Figure 4 1 is a schematic structural diagram of a cross section of a vacuum glass door body shown in an embodiment of the present application;

[0038] Figure 5 yes Figure 4 A partial enlarged view of

[0039] Figure 6 This is a schematic structural diagram of the vacuum glass door body and door frame spacer shown in an embodiment of the present application.

[0040] Description of Figure Numbers:

[0041] 1-Door frame assembly; 2-Glass assembly; 3-Door frame spacer; 3-Inner setting of the box; 11-Door frame body; 12-Visual area; 21-First glass; 22-Vacuum glass; 23-First insulation chamber; 24-Second insulation chamber; 111-Limiting groove; 112-End cover. DETAILED DESCRIPTION

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present application embodiments more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the implementation of the embodiments of the present application.

[0043] Traditional refrigeration equipment (such as refrigerators and freezers) use door structures filled with foam materials, which have good thermal insulation performance. However, there is a limitation that the internal items cannot be observed through the door. For this reason, current wine cabinets, display cabinets and other equipment generally use hollow glass transparent doors composed of a door frame and three pieces of glass, containing argon and other gases. This design solves the opacity problem and allows users to directly observe the interior, thereby reducing the heat exchange and energy consumption caused by opening the door. However, due to the high thermal conductivity of the glass material itself, this type of hollow glass door can easily cause temperature fluctuations inside the equipment through heat transfer, making its thermal insulation performance relatively insufficient.

[0044] In order to solve the above problems, the first aspect of the present application provides a vacuum glass door body, referring to Figures 1-6 As shown, the vacuum glass door body is composed of a door frame assembly 1 and a glass assembly 2.

[0045] The doorframe assembly 1 includes a doorframe body 11, which encloses a rectangular viewing area 12. The edges of the glass assembly 2 are connected to the inner wall of the doorframe body 11 through bonding or mechanical fastening. Specifically, a first glass 21 is bonded to the outside of the doorframe body 11, and a vacuum glass 22 is embedded in a retaining groove 111. The two are stacked together, forming a first insulation chamber 23 between the first glass 21 and the vacuum glass 22, and a second insulation chamber 24 within the vacuum glass 22.

[0046] The first insulation chamber 23 is hollow, with an air layer to reduce heat convection and conduction. The second insulation chamber 24 maintains a high vacuum environment, effectively blocking heat conduction. The vacuum glass 22 is formed by sealing two sheets of ordinary glass with alloy solder. The sealing process removes interstitial air, creating a vacuum layer. The first glass 21 can be ordinary flat glass or tempered glass, and the outer surface can be screen-printed with a logo or other design.

[0047] Among them, the vacuum degree of the vacuum layer is less than 5×10-2Pa, and the U value is less than 0.6W / m 2 The parameters K and gap thickness less than 0.5 mm ensure low thermal conductivity, thus reducing the heat exchange between the inside and outside of the refrigeration equipment.

[0048] Specifically, vacuum glass 22 is formed by two glass plates sealed at the edges to form a vacuum cavity, and tiny supports are arranged in the cavity to resist the atmospheric pressure difference. Due to its vacuum layer barrier, vacuum glass 22 eliminates gas convection and molecular heat conduction. Compared with insulating glass, the cavity gas density of vacuum glass 22 is extremely low, the heat transfer coefficient is low, and the energy-saving performance is significantly improved. Specifically, the advantages can be summarized as follows: 1. Excellent thermal insulation performance: The vacuum layer of vacuum glass eliminates gas convection and molecular heat conduction, and the heat transfer coefficient can be low, which is significantly better than the thermal insulation capacity of insulating glass. 2. Highly efficient sound insulation effect: The vacuum layer blocks the transmission of sound waves, and the low-frequency sound insulation reaches 36-42dB, avoiding the low-frequency resonance defects of insulating glass. 3. Lightweight and high pressure resistance: With the same performance, the thickness is only 1 / 2-1 / 3 of that of insulating glass, saving transportation and installation costs; the two pieces of glass are rigidly connected, and the wind pressure resistance is higher. 4. Anti-condensation and stability: The vacuum environment prevents internal condensation, and the critical temperature for condensation on the outer surface is lower. The vacuum layer is not affected by the installation angle, making it suitable for complex building structures. 5. Long life and compatibility: New sealing technologies (such as edge welding and gettering) extend the service life, surpassing organically sealed insulating glass. It can be combined with laminated and hollow processes to meet diverse needs such as safety and sound insulation.

[0049] In this embodiment, the vacuum degree of the vacuum layer is less than 5×10-2 Pa It can significantly reduce the heat conduction of gas molecules and reduce the heat exchange between the inside and outside of the refrigeration equipment; the U value is less than 0.6W / m 2K indicates lower heat transfer efficiency than conventional insulating glass, directly reflecting improved insulation performance. A gap thickness of less than 0.5mm further suppresses radiant heat transfer by shortening the heat radiation path. These three factors work together to further reduce heat loss from the door, ensuring stable operation of refrigeration equipment within the target temperature range while reducing compressor start-up and shutdown frequency and lowering energy consumption.

[0050] Exceptionally, in some embodiments, the outer layer of the first glass 21 may not be screen-printed, and an insulation film layer may be added to the first insulation layer. The low-emissivity insulation film layer, namely the low-e film, is a multi-layer film product composed of metals or other compounds. Its main functional layer is a silver layer, and silver is one of the substances with the lowest emissivity in nature. The reason why the low-e film is a passive insulation layer is that it can reflect infrared rays, thereby reducing heat transfer and achieving the effect of heat preservation and heat insulation. According to the number of silver layers contained, it is divided into single silver low-e film, double silver low-e film, etc. The number of silver layers in the low-emissivity insulation film layer used in this embodiment is not specifically limited here and can be selected according to actual conditions.

[0051] When the temperature of a typical hollow door is too low, moisture in the outside air easily condenses into droplets on the glass surface. In this embodiment, the glass assembly utilizes a composite structure of hollow and vacuum glass, effectively reducing thermal conductivity and heat loss, thereby improving thermal insulation and reducing the likelihood of condensation. The insulating chamber formed between two adjacent panes, combined with the vacuum layer of the vacuum glass itself, creates a first and second insulating chamber that increases the heat transfer path and resistance, further reducing heat loss and bringing the temperature of the vacuum glass door closer to the room temperature, thus minimizing condensation.

[0052] This embodiment adopts a double-layer insulation chamber design, combined with the synergistic effect of the hollow layer and the vacuum layer, to significantly improve the insulation performance of the door body and reduce cold loss. It is suitable for refrigeration equipment that requires strict temperature control, such as wine cabinets.

[0053] In some embodiments of the present application, a limiting groove 111 is provided on the inner wall of the door frame body 11, and the first glass 21 is fixed to the outer wall of the door frame body 11 by an adhesive, such as silicone sealant; the edge of the vacuum glass 22 is embedded in the limiting groove 111 and can be fixed by polyurethane foam glue.

[0054] Silicone sealant secures the first glass 21, preventing it from being crushed and shattered by external forces or thermal expansion and contraction. Retaining grooves 111 secure the vacuum glass 22, ensuring a tight seal with the door frame. The silicone sealant provides elastic fixation to adapt to temperature fluctuations, while the polyurethane foam fills gaps and enhances structural stability.

[0055] This embodiment adopts a groove design to ensure the precise docking of the glass assembly and the door frame, avoiding sealing failure or degradation of thermal insulation performance due to displacement, and extending the service life of the door body.

[0056] In some embodiments of the present application, the first thermal insulation chamber 23 has a thickness of 10-20 mm and is formed by the air layer between the first glass 21 and the vacuum glass 22. The second thermal insulation chamber 24 has a thickness of 0.3-1 mm and is the vacuum layer inside the vacuum glass 22. The first glass 21 has a larger area than the vacuum glass 22, forming a stepped edge.

[0057] Specifically, a hollow layer thickness of 10-20mm suppresses natural convection by maintaining a critical air layer thickness. Furthermore, if the air layer thickness is less than 10mm, the convection suppression effect is weakened, and if the air layer thickness is greater than 20mm, the contribution of heat radiation increases. Therefore, choosing a hollow layer thickness of 10-20mm has a greater reduction in the contribution of heat convection. A vacuum layer thickness of 0.3-1mm can reduce the contribution of heat transfer by radiation while ensuring the feasibility of vacuum packaging. The first glass area exceeds the area of ​​the vacuum glass, completely covering the edge fixing structure and reducing the direct heat conduction path between the metal fixings and the glass.

[0058] In this embodiment, the thermal insulation performance and structural strength are balanced through reasonable thickness dimensions, and the edge heat loss is further reduced through area differences, thereby improving the overall energy efficiency.

[0059] In some embodiments of the present application, the heating wire is a nickel-chromium alloy wire, embedded in the retaining groove 111 of the door frame body 11 along the edge of the vacuum glass 22, and connected to the aluminum alloy fixings of the door frame via conductive adhesive. The fixings are aluminum alloy profiles fixed to both sides of the door frame body 11 by rivets.

[0060] When energized, the heating wire generates heat and is embedded within the perimeter of the vacuum glass 22's retaining frame. Since the perimeter of the vacuum glass 22 is in direct contact with the door frame 11, the heating wire heats the perimeter of the door frame 11, bringing it close to the room's temperature. The heating wire's heating power automatically adjusts based on the current ambient humidity and temperature, ensuring that energy consumption is minimized while meeting anti-condensation requirements. The heating wire design in this embodiment not only extends the service life of the door frame 11 in vacuum glass doors, but also provides users with a more convenient and efficient user experience.

[0061] At the same time, the aluminum alloy fixings provide structural support. By adding aluminum alloy fixings on both sides of the door frame body 11, the strength of the door frame body 11 can be improved. Aluminum alloy materials are lightweight, durable, and non-deformable, which enhances the structural stability of the door frame body 11 and improves its overall aesthetics and service life.

[0062] It will be appreciated that in some embodiments, the door frame body 11 further includes end caps 112, which are disposed on the edges of the door frame body 11 to form door handles, facilitating the user's opening and closing of the door during daily use. The upper and lower end caps 112 may be elongated grooves formed along the extension of the door frame body 11, with an irregular elliptical cross-section, providing a comfortable grip for the user.

[0063] In some embodiments of the present application, the door frame spacer 3 includes a partition strip and a sealing member. The partition strip is attached to the side of the vacuum glass 22, and the sealing member is respectively bonded to both sides of the partition strip.

[0064] The partition strip blocks direct heat conduction between the door frame and the vacuum glazing 22. The sealant, with its high elasticity, fills the gap and prevents air infiltration. This double-sealed structure ensures a high vacuum level in the vacuum layer for a long time. This embodiment utilizes the partition strip and sealant to improve the airtightness and watertightness of the door, extend the service life of the vacuum glazing, and maintain stable thermal insulation performance.

[0065] In some embodiments of the present application, the viewing area 12 is rectangular, the first glass 21 and the vacuum glass 22 are both rectangular, and the length and width of the first glass 21 are both 2-3% larger than the length and width of the vacuum glass 22 .

[0066] Specifically, the length and width of the first glass 21 are 2-3% larger than those of the vacuum glass 22, allowing its edges to completely cover the fixed structures inside the door frame, such as the retaining groove 111 and the location of the seal, thereby reducing the direct contact area between the fixed structure and the vacuum glass 22. It is understandable that when the dimensional difference exceeds 3%, the stress at the glass edge will increase. Therefore, controlling the difference within the 2-3% range can effectively avoid stress concentration. In addition, the consistent design of the rectangular structure facilitates precise alignment to control tolerances, ensure the reliability of sealing performance during mass production, simplify the manufacturing process, and reduce edge heat loss by covering the fixed area, thereby improving thermal insulation.

[0067] In a second aspect of the present invention, a refrigeration device is provided, comprising: a housing and the vacuum glass door described in the above embodiment. The door is pivotally connected to one side of the housing via a hinge, and three layers of partitions are provided within the housing to divide the interior space into four insulation zones.

[0068] The swivel connection between the door and the cabinet facilitates opening and closing the refrigeration unit. Partitions separate different insulation zones to minimize cross-contamination. The refrigeration unit can independently control multiple temperature zones, improving energy efficiency and minimizing cold loss.

[0069] In some embodiments of the present application, the partition bar position of the door frame partition bar 3 is vertically aligned with the partition inside the box body, and the seal forms a linear contact with the edge of the partition when the door body is closed.

[0070] The alignment design in this embodiment ensures that when the door is closed, the partition strips and the partitions form a continuous sealing surface, preventing cold air from leaking through the gap. This improves the overall sealing of the refrigeration equipment, maintains stable temperatures in each insulation area, and reduces energy consumption.

[0071] A third aspect of the present application provides a method for preparing a vacuum glass door body. The method can be used to prepare the vacuum glass door body in the above embodiment, comprising the steps of:

[0072] S100: Enclosing the door frame body to form a viewing area; that is, bending and welding the aluminum alloy profiles to enclose a door frame body 11 with a viewing area 12.

[0073] S200: The two layers of glass are sealed together to obtain vacuum glass through a sealing process, and a second heat preservation chamber is formed. The vacuum degree of the second heat preservation chamber is less than 5×10 2 Pa, U value is less than 0.6W / m 2 .Ka, gap thickness is less than 0.5mm;

[0074] Specifically, in this step, the edges of two pieces of ordinary glass are aligned, and high-grade alloy solder (such as PbO-B2O3 system) is placed. They are heated to 450°C in a high vacuum environment (<5×10-2Pa) to melt the solder and remove the interstitial gas to form a second insulation chamber 24. The high vacuum sealing process used in this step can ensure the efficient formation of the vacuum layer.

[0075] S300: stacking the first glass and the vacuum glass so that the first glass is located outside the vacuum glass and forming a first heat preservation chamber between the first glass and the vacuum glass.

[0076] The first glass 21 and the vacuum glass 22 are stacked, and silicone sealant can be applied on the edges for bonding and fixing.

[0077] S400: Fix the edge of the glass assembly to the inner wall of the door frame body so that the glass assembly covers the viewing area.

[0078] Specifically, the glass component is embedded in the limiting groove of the door frame body, fixed with polyurethane foam glue, and a fluororubber sealant is bonded to the edge. The independence of each chamber is ensured through layered assembly and sealing technology.

[0079] The vacuum glass door manufacturing method provided in this embodiment utilizes a door frame constructed from a composite structure of aluminum alloy and PVC, which is machined to precisely control tolerances, ensuring both structural strength and lightweighting. The vacuum sealing process is completed under predetermined vacuum and temperature conditions to form a highly airtight vacuum layer. The thickness of the hollow layer is strictly controlled during glass lamination to effectively suppress thermal convection. The sealing and fixing steps ensure long-term airtightness. This process significantly reduces the heat transfer coefficient of the door while also reducing energy consumption and effectively extending the service life of the equipment.

[0080] In some embodiments of the present application, the sealing process is specifically as follows: in a high vacuum environment (vacuum degree <5×10-2Pa), PbO-B2O3 alloy solder is placed on the edges of two pieces of glass, heated to 450°C to melt the solder, and at the same time, air is continuously pumped through a vacuum pump to form a vacuum layer.

[0081] The alloy solder bonds to the oxide layer on the glass surface at high temperatures, forming an airtight seal. Simultaneous vacuuming ensures that interstitial gas is completely removed. This embodiment achieves the dual goals of high vacuum and reliable sealing, ensuring the long-term thermal insulation performance of vacuum glass.

[0082] As can be seen from the above embodiments, the vacuum glass door and refrigeration equipment using the same are used as follows: When the refrigeration equipment is running, the vacuum glass door blocks heat conduction and convection through the high vacuum layer and hollow layer, reducing internal cold loss. The heating wire automatically activates in humid environments to prevent condensation at the door frame edge. The door frame spacers align with the cabinet partitions to ensure a complete seal when closed.

[0083] The U value of the high vacuum layer of the second heat preservation chamber of the present application is less than 0.6W / m 2 ·K, vacuum degree <5×10-2Pa, significantly better than traditional insulating glass, the heating wire is combined with the sealing structure to prevent water vapor intrusion; aluminum alloy fixings and limiting grooves ensure long-term use without deformation. The multi-insulation area design of the refrigeration equipment combined with the high-sealing door body can greatly reduce energy consumption. This application achieves high performance and long life of the refrigeration equipment door body through collaborative innovation of materials, structure, and process, and is suitable for scenes with strict temperature control requirements such as wine cabinets and freezers.

[0084] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

Claims

1. A vacuum glass door, characterized in that: include: Door frame assembly (1) and glass assembly (2); The door frame assembly (1) comprises: a door frame body (11) and a visible area (12) enclosed by the door frame body (11); The edge of the glass assembly (2) is fixed to the inner wall of the door frame body (11), and the glass assembly (2) comprises: a first glass (21) and a vacuum glass (22) which are stacked; The first glass (21) is arranged on the outside of the vacuum glass (22), a first heat preservation chamber (23) is formed between the first glass (21) and the vacuum glass (22), a second heat preservation chamber (24) is formed inside the vacuum glass (22), and the second heat preservation chamber (24) is a vacuum layer with a vacuum degree less than 5×10 2 Pa, U value < 0.6W / m 2 .Ka, gap thickness <0.5mm.

2. The vacuum glass door according to claim 1, characterized in that: The inner wall of the door frame body (11) is provided with a limiting groove (111); The first glass (21) is fixed to the outer wall of the door frame body (11) via an adhesive, and the vacuum glass (22) is fixed to the inner wall of the door frame body (11) via the limiting groove (111).

3. The vacuum glass door according to claim 1, characterized in that: The thickness of the first heat preservation chamber (23) is 10-20 mm, and the thickness of the second heat preservation chamber (24) is 0.3-1 mm; The area of ​​the first glass (21) is greater than the area of ​​the vacuum glass (22).

4. The vacuum glass door according to claim 1, characterized in that: Also includes: Heating wire and fixings; The heating wire is arranged at the edge of the vacuum glass (22); The fixing members are arranged on both sides of the door frame body (11), and the material of the fixing members is aluminum alloy; The door frame body (11) further comprises an end cover (112), and the end cover (112) is arranged on the edge of the door frame body (11) to form a door handle.

5. The vacuum glass door according to claim 1, characterized in that: The door frame assembly (1) further comprises a door frame spacer (3), wherein the door frame spacer (3) comprises: a partition strip and a sealing member; The partition strip is arranged on a side of the door frame body (11) close to the vacuum glass (22), and the sealing member is arranged on a side of the partition strip away from the vacuum glass (22) and a side close to the vacuum glass (22).

6. The vacuum glass door according to claim 1, characterized in that: The shape of the viewing area (12) is rectangular; The shapes of the first glass (21) and the vacuum glass (22) are both rectangular, and the length and width of the first glass (21) are both larger than 2-3% of the length and width of the vacuum glass (22).

7. A refrigeration equipment, characterized in that: It comprises a box body and a vacuum glass door body according to any one of claims 1 to 6; The vacuum glass door is rotatably connected to one side of the box; A plurality of partitions are provided in the box body, and the partitions divide the box body into a plurality of heat preservation areas.

8. The refrigeration equipment according to claim 7, characterized in that: The door frame spacer (3) of the vacuum glass door body is arranged corresponding to the partition.

9. A method for preparing a vacuum glass door body, for preparing the vacuum glass door body according to any one of claims 1 to 6, characterized in that: The following steps are involved: Enclosing the door frame body to form a visual area; The two layers of glass are sealed together to obtain vacuum glass, and a second heat preservation chamber is formed. The vacuum degree of the second heat preservation chamber is less than 5×10 2 Pa, U value is less than 0.6W / m 2 .Ka, gap thickness is less than 0.5mm; Laying a first glass and the vacuum glass so that the first glass is located outside the vacuum glass and a first heat preservation chamber is formed between the first glass and the vacuum glass; The edge of the glass assembly is fixed to the inner wall of the door frame body so that the glass assembly covers the viewing area.

10. The method for preparing a vacuum glass door according to claim 9, characterized in that: The sealing process is: using alloy solder to seal the four sides of the vacuum glass in a high vacuum environment.

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