Refrigerated cabinet with insulating glass door

Abstract

The present invention provides a hollow glass door for a refrigerator cabinet, which comprises a glass door main body assembly and a conductive heating assembly. The glass door main body assembly includes a coated glass, a white glass is provided on one side of the coated glass, an inner heat-insulating soft rubber is provided between the coated glass and the white glass, a hollow glass cavity is provided between the coated glass and the white glass on the inner side of the inner heat-insulating soft rubber, and an inert gas is filled in the hollow glass cavity; the coated glass includes a conductive coating layer provided on its inner surface, the inner heat-insulating soft rubber is located around the inner surface of the conductive coating layer and around the inner wall surface of the white glass; a conductive silver paste strip is fixedly provided near one side of the inner surface of the conductive coating layer, the inner edge of the conductive silver paste strip does not exceed the inner edge of the inner heat-insulating soft rubber, and an outer support soft rubber is provided on the outer periphery of the inner heat-insulating soft rubber. It can prevent the hollow glass from dew condensation and frosting, has good airtightness, long service life, and the glass door is transparent and beautiful. The present invention can be widely applied to refrigerator cabinets.

Description

Technical Field

[0001] The present invention relates to a glass door, and particularly to a hollow glass door for a refrigerator cabinet. Background Art

[0002] In order to achieve the aesthetic and transparent effects, traditional refrigerated display cabinets often use glass doors. There are mainly three common types of hollow glass doors for refrigerator cabinets in the existing market, which are specifically as follows:

[0003] One is a metal hollow strip type hollow glass door with double-layer ordinary glass. Due to the temperature difference between the inside and outside of the cabinet, condensation or frosting inevitably occurs on the glass door, making the glass door become blurred, unable to clearly see the items inside the cabinet, affecting its transparent effect and aesthetics, and causing certain impacts on both merchants and customers, affecting the sales effect of merchants and the experience of customers.

[0004] The second type has a metal conductive film coated on the outer layer of the glass. A metal spacer is used between the double-layer glasses of the hollow glass. Silver paste lines are added on both sides of the glass coated with the conductive film. The glass is heated by connecting a power supply to the silver paste lines on both sides of the glass to solve the problems of condensation and frosting. However, due to the strong conductivity of the metal hollow strip, when in use, the conductive film on the glass at the position of the metal hollow strip needs to be removed. The silver paste lines should be inside the metal hollow strip and cannot contact the metal hollow strip. The power supply connection line needs to be punched through the metal hollow strip. Therefore, the airtightness of this type of hollow glass door is poor, the inert gas cannot be retained in the hollow cavity for a long time, the energy-saving effect of the glass door is poor, and finally the energy consumption of the product increases.

[0005] The third type is similar to the second type in process, except that the metal spacer is changed to a spacer made of PVC material. Since the PVC material is an insulator, the conductive film does not need to be removed at the contact part with the conductive film, and the silver paste strip can also be on the outside of the spacer. The inert gas can be filled in the hollow cavity. However, the spacer of this process is a plug-in type, and the four corners of the spacer are connected by plugs, and its airtightness is poor, and the inert gas in the cavity has a short retention time, and the energy-saving effect will also be poor after using for a period of time. Summary of the Invention

[0006] Aiming at the technical problems existing in the above three common hollow glass doors, such as easy condensation or frosting, poor airtightness of the hollow glass door, inability to retain inert gas in the hollow cavity for a long time, poor energy-saving effect of the glass door, and finally large energy consumption of the product, the present invention provides a hollow glass door for a refrigerator cabinet and a processing method for the hollow glass door for a refrigerator cabinet. The hollow glass door for a refrigerator cabinet can prevent condensation and frosting of the hollow glass, has good airtightness, long service life, is transparent and beautiful, has a good user experience, can effectively block the heat exchange and transfer between the inside and outside of the cabinet, reduce energy consumption, and is more energy-saving; the processing process method of the hollow glass door for a refrigerator cabinet is simple and reliable, and has high process stability.

[0007] To this end, the technical solution of the present invention is a hollow glass door for a refrigerator cabinet, which includes a glass door main body assembly and a conductive heating assembly. The glass door main body assembly includes coated glass, with a white glass provided on one side of the coated glass. An inner heat insulation soft glue is provided between the coated glass and the white glass. A hollow glass cavity is provided inside the coated glass and the white glass on the inner side of the inner heat insulation soft glue. An inert gas is filled inside the hollow glass cavity; the coated glass includes a conductive coating layer provided on its inner surface. The inner heat insulation soft glue is located around the inner surface of the conductive coating layer and around the inner wall surface of the white glass; a conductive silver paste strip is fixedly provided near one side of the inner surface of the conductive coating layer. The inner edge of the conductive silver paste strip does not exceed the inner edge of the inner heat insulation soft glue. One end of the conductive silver paste strip is fixedly provided with a welding point for the power line. Near the other side of the inner surface of the conductive coating layer, a conductive silver paste strip is fixedly provided again. One end of the conductive silver paste strip is fixedly provided with a welding point for the power line below. The welding point for the power line above and the welding point for the power line below are respectively located at two diagonal positions of the coated glass. Power lines are respectively connected to the welding point for the power line above and the welding point for the power line below. The outer end of the power line is an external connection end of the power line, and the external connection end of the power line leaks outside the glass door main body assembly. The conductive coating layer, the conductive silver paste strip and the power line form a conductive heating assembly; an outer support soft glue is provided around the outer periphery of the inner heat insulation soft glue.

[0008] Preferably, the conductive silver paste strip is located outside the inner heat insulation soft glue, or the conductive silver paste strip is located at the bottom of the inner heat insulation soft glue.

[0009] Preferably, the material of the inner heat insulation soft glue is a thermoplastic glue, and the material of the outer support soft glue is a silicone glue.

[0010] Preferably, the equivalent thermal conductivity of the thermoplastic glue ≤ 0.24 W / (m·k), and the resistivity ≥ 10 6 -10 7 ohm·cm.

[0011] Preferably, the distance between the outer surface of the inner heat insulation soft glue and the outer sides of the coated glass and the white glass is 8 mm - 15 mm.

[0012] Preferably, the width of the conductive silver paste strip is 5 mm - 6 mm.

[0013] Preferably, the width of the inner heat insulation soft glue is 5.8 mm - 6.8 mm, and the thickness of the inner heat insulation soft glue is 2 mm - 20 mm.

[0014] Preferably, the width of the inner heat insulation soft glue is 5.8 mm - 6.8 mm, the thickness of the inner heat insulation soft glue is 2 mm - 2.5 mm, the distance between the outer surface of the inner heat insulation soft glue and the outer sides of the coated glass and the white glass is 10 mm - 11 mm, and the width of the conductive silver paste strip is 5.5 mm - 5.6 mm.

[0015] Preferably, the external connection end of the power cord is located on the side of the hollow glass door of the refrigerator cabinet that serves as the rotating shaft.

[0016] Preferably, white glass is provided on both sides of the coated glass.

[0017] The beneficial effects of the present invention are as follows. Since the hollow glass door of the refrigerator cabinet includes a conductive heating component, it can be automatically powered on and off according to the set temperature through an external control circuit. When powered on, the coated glass can be heated to prevent dew condensation and frosting problems. Since there is no need to remove the film over a large area around the conductive coating layer of the coated glass, the heating area of the coated glass is maximally retained, effectively preventing the problem that the periphery of the glass door is particularly prone to dew condensation due to cold exposure. In addition, the process is simplified during the manufacturing process. Therefore, by using this kind of hollow glass door on fresh-keeping cabinets and freezers, it can ensure that there is no dew condensation and frosting on the glass door, and ensure the transparency and beauty of the glass door.

[0018] The hollow glass door of the present invention can achieve the effects of preventing dew condensation and frosting, and at the same time can achieve energy conservation. The technical solution of the present invention can be used for the glass doors of refrigeration cabinets such as fresh-keeping cabinets and freezers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the present invention;

[0020] Figure 2 is Figure 1 a side view of

[0021] Figure 3 is Figure 2 a cross-sectional view of

[0022] Figure 4 is Figure 2 a cross-sectional view of another solution of

[0023] Figure 5 is Figure 1 a cross-sectional view of

[0024] Figure 6 is Figure 1 a cross-sectional view of another solution of

[0025] Figure 7 is a schematic diagram of a form of the conductive silver paste strip;

[0026] Figure 8 is a schematic diagram of another form of the conductive silver paste strip;

[0027] Figure 9 is a schematic diagram of another form of the conductive silver paste strip;

[0028] Figure 10It is a schematic diagram of a conductive silver paste tape with size indication;

[0029] Figure 11 It is a schematic diagram of the structure and usage of a glue spreading and leveling component;

[0030] Figure 12 It is a schematic diagram of another structure and usage of a glue spreading and leveling component;

[0031] Figure 13 It is a schematic diagram of another structure and usage of a glue spreading and leveling component;

[0032] Figure 14 It is a top view of the leveling plate;

[0033] Figure 15 It is another top view of the leveling plate;

[0034] Figure 16 It is a schematic diagram of a glue gun;

[0035] Figure 17 It is Figure 16 of the top view;

[0036] Figure 18 It is Figure 16 of the cross-sectional view;

[0037] Figure 19 It is a schematic diagram of another glue gun;

[0038] Figure 20 It is Figure 19 of the cross-sectional view;

[0039] Figure 21 It is a schematic diagram of the glue dividing hole;

[0040] Figure 22 It is another schematic diagram of the glue dividing hole;

[0041] Figure 23 It is a schematic diagram of another glue gun;

[0042] Figure 24 It is Figure 23 of the front view;

[0043] Figure 25 It is Figure 23 of the top view;

[0044] Figure 26 It is Figure 23 of the cross-sectional view;

[0045] Figure 27 It is a schematic diagram of another glue gun;

[0046] Figure 28 It is Figure 27Schematic diagram of the application of the glue gun.

[0047] Explanation of symbols in the figure:

[0048] 1. Inner heat-insulating soft glue; 2. Side of the cabinet body rotating shaft; 3. Outer supporting soft glue; 4. Welding point on the power line; 5. Conductive silver paste strip; 6. Power line; 7. Outer connection end of the power line; 8. Coated glass; 9. White glass; 10. Conductive coating layer; 11. Hollow glass cavity; 12. Glass door main body assembly; 13. Conductive heating assembly; 14. Welding point under the power line; 15. Glue spreading and leveling assembly; 1501. Spreading plate; 1502. Glue gun; 150201. Glue inlet rod; 150202. Glue nozzle; 150203. Glue inlet channel; 150204. Glue gun fixing cone; 150205. Glue outlet inclined surface; 150206. Glue guiding arc; 150207. Glue scraping sharp corner; 150208. Transverse glue guiding groove; 150209. Glue gun main body; 150210. Glue dividing hole; 1503. Anti-overflow glue side plate; 1504. Side cleaning soft pad; 1505. Glue gun mounting hole; 1506. Guide post; 1507. Spring; 1508. Support plate. Detailed implementation manner

[0049] The present invention will be further described below in conjunction with embodiments.

[0050] Figures 1 - 28 This is an embodiment of a hollow glass door of a refrigerator and its manufacturing method according to the present invention. As can be seen from the figure, it includes a glass door main body assembly 12 and a conductive heating assembly 13. The glass door main body assembly 12 includes a coated glass 8. One side of the coated glass 8 is provided with a white glass 9. An inner heat-insulating soft glue 1 is provided between the coated glass 8 and the white glass 9. A hollow glass cavity 11 is provided between the coated glass 8 and the white glass 9 inside the inner heat-insulating soft glue 1, and an inert gas is filled inside the hollow glass cavity 11. The coated glass 8 includes a conductive coating layer 10 provided on its inner surface. The inner heat-insulating soft glue 1 is located around the inner surface of the conductive coating layer 10 and the inner wall surface of the white glass 9. A conductive silver paste strip 5 is fixedly provided on the inner surface of the conductive coating layer 10 near one side. The inner edge of the conductive silver paste strip 5 does not exceed the inner edge of the inner heat-insulating soft glue 1. One end of the conductive silver paste strip 5 is fixedly provided with a welding point 4 on the power line. A conductive silver paste strip 5 is fixedly provided on the inner surface of the conductive coating layer 10 near the other side. One end of the conductive silver paste strip 5 is fixedly provided with a welding point 14 under the power line. The welding point 4 on the power line and the welding point 14 under the power line are respectively located at two diagonal positions of the coated glass 8. Power lines 6 are respectively connected to the welding point 4 on the power line and the welding point 14 under the power line. The outer end of the power line 6 is an outer connection end 7 of the power line. The outer connection end 7 of the power line leaks outside the glass door main body assembly 12. The conductive coating layer 10, the conductive silver paste strip 5 and the power line 6 form a conductive heating assembly 13. An outer supporting soft glue 3 is provided around the outer periphery of the inner heat-insulating soft glue 1.

[0051] In this embodiment, the conductive silver paste strip 5 is located outside the inner heat-insulating soft rubber 1, as Figure 3 shown. Such a structure facilitates the welding of the power supply line 6. At the same time, the conductive silver paste strip 5 does not contact the inner heat-insulating soft rubber 1 and is completely covered by the outer supporting soft rubber 3. When the conductive heating component 13 is powered on, a uniform circuit density can be formed, the heating is more uniform, and the energy consumption during long-term use is also lower.

[0052] As Figure 4 shown, the conductive silver paste strip 5 can also be located at the bottom of the inner heat-insulating soft rubber 1. In such a structure, the conductive silver paste strip 5 is in complete covering contact with the inner heat-insulating soft rubber 1. Since the inner heat-insulating soft rubber 1 has a high resistance value, when the conductive heating component 13 is powered on, most of the current will also flow along the conductive coating layer 10, and a uniform current will also be formed, which can also achieve the technical effect of forming a uniform circuit density, the heating is very uniform, and the energy consumption during long-term use is also lower; in this solution, the welding points 4 on the power supply line and the welding points 14 under the power supply line on the conductive silver paste strip 5 are both placed outside the inner heat-insulating soft rubber 1. In this way, after the inner heat-insulating soft rubber 1 is applied with glue on site, the power supply line 6 can be welded, and the operation is convenient.

[0053] As Figure 9 shown, a part of the conductive silver paste strip 5 can also be placed at the bottom of the inner heat-insulating soft rubber 1, and the other part can be placed in the outer area of the inner heat-insulating soft rubber 1, which can also ensure the heating performance of the product.

[0054] The material of the inner heat-insulating soft rubber 1 in this embodiment is a thermoplastic rubber, including TPS rubber or 4SG rubber. The equivalent thermal conductivity of the TPS thermoplastic rubber is 0.24 W / (m·k), which can effectively control the heat conduction, control the heat conduction inside and outside the control cabinet, and play the role of heat preservation and energy saving. At the same time, the resistivity of the TPS rubber or 4SG rubber can reach 10 6 -10 7 ohm·cm, which can ensure the insulation effect between the inner heat-insulating soft rubber 1, the conductive silver paste strip 5 and the conductive coating layer 10, and ensure the smoothness of the current channel of the conductive heating component 13. Generally, when selecting the thermoplastic rubber, it is necessary to ensure that the equivalent thermal conductivity ≤ 0.24 W / (m·k) and the resistivity ≥ 10 6 -10 7 ohm·cm, which can well meet the requirements of the insulating glass door used in the fresh-keeping cabinet and the storage display cabinet.

[0055] The material of the outer supporting soft rubber 3 is silicone rubber, and the silicone rubber also has a high resistivity and a low thermal conductivity, which can further ensure the smoothness of the current heating channel and the heat insulation and heat preservation effect.

[0056] In this implementation, the material of the inner heat-insulating soft rubber 1 is thermoplastic rubber, and the material of the outer supporting soft rubber 3 is silicone rubber. The outer surface of the outer supporting soft rubber 3 is flush with the outer sides of the coated glass 8 and the white glass 9. Such a structure can ensure that after the silicone rubber is cured, there will be a very stable thickness support, ensuring the stable thickness dimension of the double-layer hollow glass door of the refrigerator, and enabling long-term stable use without deformation.

[0057] In this technical solution, both the thermoplastic rubber and the silicone rubber have large resistance values. Especially when the thermoplastic rubber uses TPS rubber, the conductive silver paste strip 5 is in close contact with the conductive coating layer 10 of the coated glass 8, forming a good conductive effect. At the same time, there is a good insulation effect between the conductive silver paste strip 5 and the thermoplastic rubber and the silicone rubber. During the production process, no anti-insulation treatment is required. Especially when compared with the existing metal spacer and the spacer made of PVC material, in order to insulate from the conductive silver paste strip 5, the conductive coating layer 10 at the bottom of the metal spacer and the spacer made of PVC material needs to be removed during production to ensure conductivity. However, the process of this embodiment is simpler, the reliability of conductive heating is higher, and the long-term use stability is better.

[0058] In this embodiment, the width of the conductive silver paste strip 5 is 5 mm - 6 mm, the distance between the outer surface of the inner heat-insulating soft rubber 1 and the outer sides of the coated glass 8 and the white glass 9 is 8 mm - 15 mm, the width of the inner heat-insulating soft rubber 1 is 5.8 mm - 6.8 mm, and the thickness of the inner heat-insulating soft rubber 1 is 2 mm - 20 mm. Such structural dimensions can form a stable support structure and at the same time ensure the stable sealing performance of the hollow glass cavity 11. Also, because it is not necessary to remove the conductive coating layer 10 at the bottom of the inner heat-insulating soft rubber 1 during production, the coated glass 8 can have a complete conductive coating layer 10, which can ensure the uniformity of the current density inside the conductive coating layer 10, and then ensure the uniformity of the heat generation of the conductive coating layer 10, and finally ensure a good heating effect of the conductive heating component 13, and no frosting or condensation occurs inside the hollow glass cavity 11.

[0059] As an optimized dimension, the width of the inner heat-insulating soft rubber 1 is 5.8 mm - 6.8 mm, as shown in Figure 10 the B dimension shown in, the thickness of the inner heat-insulating soft rubber 1 is 2 mm - 2.5 mm, and the distance between the outer surface of the inner heat-insulating soft rubber 1 and the outer sides of the coated glass 8 and the white glass 9 is 10 mm - 11 mm, as shown in Figure 10As shown in , for the dimension A, the width of the conductive silver paste strip 5 is 5.5 mm - 5.6 mm, which can meet the usage requirements of most-sized fresh-keeping cabinets and refrigerators. It can not only endow the insulating glass door of the refrigerator with a beautiful appearance and permeability, but also ensure the structural stability, no deformation, reliable sealing and long service life. At the same time, because the thickness of the inner heat-insulating soft rubber 1 is 2 mm - 2.5 mm, the thickness of the insulating glass cavity 11 between the insulating glasses formed is maintained between 2 mm and 2.5 mm. When used for the glass door of the fresh-keeping cabinet, the overall thickness is relatively small, which is very suitable for use, with better permeability. It can not only ensure good heat preservation performance, but also ensure the beauty of the fresh-keeping cabinet, good visibility, and the exhibits inside are clearly visible. When opening and closing the door, due to the thin thickness, the operation is very easy, with a good feel, and users very much like to customize products of this size.

[0060] In this embodiment, the welding point 4 on the power line and the welding point 14 under the power line are respectively located at two diagonal positions of the coated glass 8. Such a design of the diagonal structure can ensure that when the current from external power supply is conducted through the conductive silver paste strip 5 and the conductive coating layer 10, there is a symmetric channel, thereby ensuring that the density of the current entering the conductive coating layer 10 is more uniform, with a better heating effect, no area with a large resistance value for the current, small overall current consumption, and ensuring low energy consumption during long-term use.

[0061] The inert gas in this embodiment is the commonly used argon gas, and other inert gases can also be used. Filling inert gases such as argon into the insulating glass cavity 11 can further reduce the heat conduction coefficient, further ensure the heat conduction between the inside and outside of the cabinet, and achieve an energy-saving effect during long-term use.

[0062] The external connection end 7 of the power line is located on the side of the insulating glass door of the refrigerator that serves as the rotating shaft, which can facilitate installation and integration.

[0063] As another form, white glasses 9 are respectively provided on both sides of the coated glass 8 to form a double-layer glass door. Multilayer glass doors can also be formed according to special needs. Another white glass 9 is added on the other side of the coated glass 8, and an insulating glass cavity 11 is also formed inside. The gluing process and structure between the coated glass 8 and the white glass 9 are the same, so that a double-layer insulating glass can be easily fabricated. Multilayer insulating glasses can also be fabricated according to a similar process method.

[0064] The manufacturing method of the insulating glass door of the refrigerator in this embodiment includes the following steps:

[0065] (1) Cut the coated glass 8 and the white glass 9 according to the required dimensions;

[0066] (2) Perform edge grinding on the cut coated glass 8 and white glass 9;

[0067] (3) Temper the coated glass 8 and the white glass 9 after edge grinding;

[0068] (4) Coat conductive silver paste strips 5 at the upper and lower positions on the outer surface of the conductive coating layer 10 of the coated glass 8;

[0069] (5) Clean and dry the coated glass 8 and the white glass 9, and coat a certain thickness of inner heat-insulating soft glue 1 around the outer side of the outer surface of the conductive coating layer 10 of the coated glass 8;

[0070] (6) Press the coated glass 8 and the white glass 9 together. The inner heat-insulating soft glue 1 forms a seamless connection with the coated glass 8 and the white glass 9, and a hollow glass cavity 11 is formed between the coated glass 8 and the white glass 9; while pressing, fill the hollow glass cavity 11 with inert gas;

[0071] (7) Weld power supply lines 6 to the welding point 4 on the power supply line and the welding point 14 on the lower power supply line respectively. The power supply line external ends 7 of the upper and lower two power supply lines 6 are exposed outside the coated glass 8 and the white glass 9;

[0072] (8) Fill and inject the outer support soft glue 3 into the hollow glass cavity 11 outside the inner heat-insulating soft glue 1 to further bond the coated glass 8 and the white glass 9. The outer support soft glue 3 covers all the conductive silver paste strips 5 and the power supply lines 6;

[0073] (9) Cure the coated glass and the white glass after filling and injecting the outer support soft glue to form a hollow glass.

[0074] In this embodiment, in the process of step (6) above, the two sides of the coated glass 8 can also be pressed together with the white glass 9 respectively to form two layers of hollow glass cavities 11 between the coated glass 8 and the white glass 9, thus forming a double-layer structure.

[0075] The time interval between step (6) and step (8) above is less than 1 minute. Through experiments, it is proved that an effective bond can be formed between the inner heat-insulating soft glue 1 and the outer support soft glue 3, and the product performance dimensions are stable.

[0076] In this embodiment, when filling and injecting the outer support soft glue 3, a glue spreading and leveling assembly 15 is used, as Figures 11 - 26 shown in the process schematic diagram for filling and injecting the outer support soft glue 3.

[0077] Figures 16 - 18This is an embodiment of the glue - spreading and leveling assembly 15. As can be seen in the figure, the glue - spreading and leveling assembly 15 includes a leveling plate 1501 and a glue gun 1502. A glue - gun mounting hole 1505 is provided on the leveling plate 1501; The glue gun 1502 includes a glue - feeding rod 150201. At the front end of the glue - feeding rod 150201, there is a glue - gun fixing cone 150204. At the front end of the glue - gun fixing cone 150204, there is a glue - discharging inclined surface 150205. A glue - discharging nozzle 150202 is provided on the glue - discharging inclined surface 150205. A glue - feeding channel 150203 is provided inside the glue - feeding rod 150201. A glue - distributing hole 150210 is provided at one end of the glue - feeding channel 150203 close to the glue - discharging nozzle 150202. The glue - feeding channel 150203, the glue - distributing hole 150210 and the glue - discharging nozzle 150202 are connected. The inner diameter of the glue - feeding channel 150203 is larger than the inner diameter of the glue - distributing hole 150210; A part of the glue - gun fixing cone 150204 can be inserted into the glue - gun mounting hole 1505 to form a sealed connection. When in use, the glue - gun fixing cone 150204 is obliquely inserted into the glue - gun mounting hole 1505 of the leveling plate 1501, and the bottom surface of the leveling plate 1501 is in contact with the outer sides of the coated glass 8 and the white glass 9. In this embodiment, since the inner diameter of the glue - feeding channel 150203 is larger than the inner diameter of the glue - distributing hole 150210, when feeding glue, the glue - feeding channel 150203 can store a large amount of glue in large flow, which can meet the glue - discharging needs of multiple glue - distributing holes 150210, ensure the stability of the glue - applying and glue - spreading processes, and prevent glue leakage or air entry due to insufficient glue volume. The glue - applying quality is stable.

[0078] Figures 19 - 22 This is another embodiment of the glue - spreading and leveling assembly 15. As can be seen in the figure, different from Figures 16 - 18 the above, the glue - discharging nozzle 150202 is provided with a plurality of glue - guiding arcs 150206. A glue - scraping sharp corner 150207 is provided between adjacent glue - guiding arcs 150206. The existence of the plurality of glue - guiding arcs 150206 will form an appearance shape of multiple arc segments on the surface when discharging glue. When leveling through the bottom surface of the leveling plate 1501, due to the existence of multiple arc segments on the outer surface of the glue, it is very easy to quickly level the outer surface of the glue, and the distribution is uniform. The glue - applying and glue - spreading effects are very good, and the leveling efficiency is also very high.

[0079] Figure 14 and Figure 15 These are two schematic diagrams of the shapes of the glue - gun mounting hole 1505. Different shapes can meet the adaptation of the shape of the glue - gun mounting hole 1505 to the glue - gun fixing cone 150204. The shape of the glue - gun mounting hole 1505 is an oval or a multi - arc - shaped hole, and it can also be designed into other shapes according to the different shapes of the glue - gun fixing cone 150204. Figure 14 and Figure 15As can be seen, the top view of the squeegee plate can respectively adapt to two different-shaped glue gun fixing cones 150204, where Figure 14 the oval glue gun mounting hole 1505 can satisfy the shape of the circular glue gun fixing cone 150204. When the glue gun fixing cone 150204 is inserted into the glue gun mounting hole 1505, a sealing form with a certain acute angle is formed. Due to the existence of the acute angle, the glue can flow smoothly, and the gluing process can be completed smoothly. Generally, the acute angle is selected between 30° and 60°. The movement direction of the glue nozzle 150202 is along the direction of the acute angle, and the gluing process and the scraping process will be more smooth; Figure 15 the multi-arc-shaped glue gun mounting hole 1505 in it can also adapt to the multi-arc-shaped appearance of the glue gun fixing cone 150204.

[0080] Figures 11 - 13 Various forms of the squeegee plate 1501 can also be seen in Figure 11 the squeegee plate 1501 in is in the form of a flat plate, which is more suitable for manual gluing during the production of small-sized glass; Figure 12 the squeegee plate 1501 in can satisfy mechanical automatic gluing. It can be seen that anti-overflow glue side plates 1503 are respectively provided on both sides of the squeegee plate 1501, and side cleaning soft pads 1504 are provided on the inner sides of the anti-overflow glue side plates 1503. The setting of the side cleaning soft pads 1504 can further clean up the slight glue leakage on both sides during mechanical gluing and directly enter the next process to complete automated production. Figure 13 The structural form in is further optimized. As can be seen in the figure, a support plate 1508 is fixedly provided on one side of the squeegee plate 1501. One of the anti-overflow glue side plates 1503 is located inside the support plate 1508. A guide post 1506 is fixedly provided on the outer side of the anti-overflow glue side plate 1503. A spring 1507 is sleeved on the outer circle of the guide post 1506. The anti-overflow glue side plate 1503 forms a sliding connection with the squeegee plate 1501, which can satisfy the production of glass doors with different thicknesses. This kind of squeegee has stronger versatility, can quickly meet the processing and gluing of various specifications of glass, and improve the production efficiency of the overall production line.

[0081] Figures 23 - 26It is another embodiment of the glue - applying and leveling component 15. As can be seen in the figure, the glue - applying and leveling component 15 includes a glue - applying main body 150209. A glue gun 1502 is provided at one end of the glue - applying main body 150209. A transverse glue - guiding groove 150208 is provided on one surface of the glue - applying main body 150209. Anti - overflow glue side plates 1503 are fixedly provided on both sides of the transverse glue - guiding groove 150208. An inlet glue channel 150203 is provided inside the glue gun 1502. A plurality of glue - dividing holes 150210 are provided on one side of the inlet glue channel 150203 close to the glue - applying main body 150209. The inner diameter of the inlet glue channel 150203 gradually decreases in a stepped manner on the side close to the glue - dividing holes 150210. Different from other embodiments, the technical solution of this embodiment is that the anti - overflow glue side plates 1503 and the glue - applying main body 150209 are of an integrated structure. Such a structure is more likely to meet the automatic production of a large - batch production line. The glue - applying and leveling component 15 can be integrated with an automatic glue - applying device to complete fully automatic glue - applying production. Due to the existence of the transverse glue - guiding groove 150208, the glue output can be very large. During glue application, the glue material quickly flows out along the transverse glue - guiding groove 150208 and then quickly enters between the two layers of glass to complete industrial - automated filling. Figure 26 As can also be seen in the figure, the glue - dividing holes 150210 can be set into multiple pieces according to the width of the transverse glue - guiding groove 150208. The outermost glue - dividing holes 150210 and the innermost glue - dividing holes 150210 are fan - shapedly distributed and are respectively connected to the inlet glue channel 150203. The inner diameter of the inlet glue channel 150203 gradually decreases in a stepped manner on the side close to the glue - dividing holes 150210, which can meet the synchronism during glue output. Because the inner diameter of the connection between the outermost glue - dividing hole 150210 of the fan - shape and the inlet glue channel 150203 is larger than the inner diameter of the connection between the innermost glue - dividing hole 150210 of the fan - shape and the inlet glue channel 150203, the glue output speed of the outermost glue - dividing hole 150210 of the fan - shape can be quickly ensured during glue output, ensuring the stability of the glue - applying process, thereby ensuring the glue - applying quality. Generally, the glue - dividing holes 150210 distributed in a fan - shape along both sides of the inlet glue channel 150203 are symmetrically arranged, so that the glue output on both sides is uniform and the process quality is stable.

[0082] Figure 27 In the embodiment, in order to meet the glue application of double - layer glass with a relatively large thickness, as can be seen in the figure, two transverse glue - guiding grooves 150208 are provided. The two transverse glue - guiding grooves 150208 are in an isolated state. Such two isolated transverse glue - guiding grooves 150208 can simultaneously fill and apply glue to two gaps respectively, without filling the glue - applying gaps one by one, greatly improving the glue - applying process for large - thickness multi - layer insulating glass.

[0083] Figures 23 - 28 The embodiment of the glue - applying and leveling component 15 can meet the automatic glue application of insulating glass with a relatively large thickness. Figure 27Particularly suitable for the gluing process of large-thickness multi-layer insulating glass.

[0084] Figure 28 is Figure 27 The application schematic diagram of the embodiment. As can be seen in the figure, two isolated transverse glue guiding grooves 150208 can simultaneously fill and apply glue to two gaps respectively, so as to meet the automatic gluing of insulating glass with relatively thick thickness and double layers. The gluing of the two filled gaps is symmetrical and stable, which can ensure the stability of the automatic production process and the quality of the product. In this embodiment, the inner diameter of the glue inlet channel 150203 is 20mm ± 1mm, the inner diameter of the glue inlet channel 150203 at the connection with the outermost fan-shaped glue dividing holes 150210 is 16mm ± 1mm, the inner diameter of the glue inlet channel 150203 at the connection with the innermost fan-shaped glue dividing holes 150210 is 12mm ± 1mm, and the inner diameters of the outermost fan-shaped glue dividing holes 150210 and the innermost fan-shaped glue dividing holes are 10mm ± 1mm. Such a dimensional structure can basically meet the gluing process requirements of most commonly used double-layer insulating glass, and has strong versatility.

[0085] When manufacturing the insulating glass of this embodiment, generally, the width of the conductive silver paste strip 5 is 5mm - 6mm, which can meet the need for current passing and can also save silver paste. In actual manufacturing, generally, the conductive silver paste strip 5 is selected to be coated on two opposite sides in the width direction. The length in the width direction is relatively short, which can further reduce the usage amount of silver paste and lower the cost. At the same time, it can both ensure the need for current flow and the need for heating.

[0086] Since it includes a conductive heating component 13, through an external control circuit, it can be automatically powered on and off according to the set temperature. When powered on, the coated glass 8 can be heated to prevent the problems of dew condensation and frost formation. Since there is no need to remove the film on a large area around the conductive coating layer 10 of the coated glass 8, the heating area of the coated glass 8 is retained to the greatest extent, which can effectively prevent the problem that the door body is particularly prone to dew condensation around the glass door due to cold dew around the glass door, and simplifies the process during the processing. Therefore, using this kind of insulating glass door on a fresh-keeping cabinet and a freezer can ensure that there is no dew condensation and frost formation on the glass door, and ensure the transparency and beauty of the glass door.

[0087] The glass used in this embodiment is tempered. Because tempered glass belongs to safety glass, it is not easy to break and has good safety. Glass that is not tempered can also be used.

[0088] In the insulating glass cavity area outside the TPS glue, silicone glue is fully coated. By utilizing the structural property of the silicone glue, the complete bonding of the two layers of glass is achieved. By utilizing the effective supporting property of the silicone glue, the nominal thickness of the overall insulating glass is maintained for a long time. Two conductive leads are led out from the upper corner of the actual use opening rotation shaft side of the glass door. When installing on the cabinet, it can be directly connected to the cabinet power supply line.

[0089] For the insulating glass that has completed the basic bonding, according to the actual use opening rotation shaft side, at one end of the lower silver paste strip close to the rotation shaft side, a conductive lead is welded. At the diagonal end of the upper silver paste strip where the lead is welded to the lower silver paste strip, a conductive lead is also welded. The length of the lead is based on the length that can reach the upper corner of the rotation shaft side along the outside of the TPS glue plus 50 mm. The additional 50 mm is beneficial for connecting to the cabinet power supply and can also be lengthened according to user requirements. Inert gas is filled into the insulating glass cavity 11 to reduce the heat transfer coefficient of the gas in the insulating glass cavity. After the TPS glue is pressed, seamless docking is achieved, and the airtightness is very good, and it can keep the inert gas effective for more than 50 years.

[0090] In this embodiment, at the position of the upper periphery of one layer of the glass, TPS or 4SG thermoplastic glue is coated according to the required thickness. The coating position of the TPS glue is based on the condition that the silver paste strip is not exposed inside the TPS glue. It is also possible to expose the silver paste strip outside the TPS glue. The resistance value of this glue is very large and does not affect the conductivity of the silver paste strip and the conductive film at all. In the area where the TPS glue contacts the conductive film, there is no need to remove the conductive film, and the silver paste strip can also be in full contact with the TPS glue. One layer of the glass is a high-transmittance coated glass with a conductive low-emissivity film layer on its surface. This kind of glass selects the online low-emissivity LOW_E coated glass that is easily purchased in the market. The coating layer itself has the function of preventing radiation, which can effectively reduce the heat radiation transfer. It belongs to a metal film and has good conductivity. The coating layer is coated while the original glass is being produced, and the combination of the coating layer and the glass body is good and will not oxidize.

[0091] One layer of the insulating glass is a high-transmittance coated glass with a conductive low-emissivity film layer. Conductive silver paste lines are coated on both sides of the coated film surface. TPS glue or 4SG glue is used to separate the two layers of glass. Because the resistance value of the TPS glue is very large, the current will automatically choose to pass through the silver paste line and the conductive low-emissivity film layer. There is no need to remove the conductive film layer on the contact surface. At the same time, inert gas is filled to combine the two layers of glass together. The connecting leads of the silver paste line are welded, and then silicone glue is coated in the cavity from the outside of the TPS glue to the edge of the glass. The welded leads are between the TPS glue and the silicone glue, and the gathering point is at the upper corner of the rotation shaft side of the glass door, thus forming an energy-saving glass door that prevents condensation and frosting.

[0092] The insulating glass door of the present invention only illustrates a single-chamber insulating glass door formed by using two layers of glass. A multi-chamber insulating glass door can also be formed by using multiple layers of glass, and the manufacturing method is the same as that of the present invention. For example, when manufacturing a multi-chamber insulating glass door, one layer of online LOW-E glass can be used for each cavity, and the energy-saving effect is better.

[0093] In the technical solution of the present invention, since the insulating glass door of the refrigerator cabinet includes a conductive heating component 13, it can be automatically powered on and off according to the set temperature through an external control circuit. When powered on, the coating glass 8 can be heated to prevent condensation and frosting. Since there is no need to remove the film over a large area around the conductive coating layer 10 of the coating glass 8, the heating area of the coating glass 8 is maximally retained, effectively preventing the problem that the periphery of the glass door is particularly prone to condensation due to cold dew. The process is also simplified during the processing. Therefore, by adopting this insulating glass door on the fresh-keeping cabinet and the freezer, it can ensure that there is no condensation and frosting on the glass door, and ensure the transparency and beauty of the glass door.

[0094] The insulating glass door of the present invention can achieve the effects of anti-condensation and anti-frosting, and at the same time can achieve energy conservation. The technical solution of the present invention can be used for the glass doors of refrigerators such as fresh-keeping cabinets and freezers.

[0095] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components or the equivalent changes and modifications made according to the scope of protection of the present invention shall still fall within the scope covered by the claims of the present invention.

Claims

1. A hollow glass door for a refrigerator cabinet, characterized in that: It includes a glass door main body assembly and a conductive heating assembly. The glass door main body assembly includes coated glass. On one side of the coated glass, there is white glass. An inner heat-insulating soft glue is provided between the coated glass and the white glass. A hollow glass cavity is provided inside the coated glass and the white glass on the inner side of the inner heat-insulating soft glue. The hollow glass cavity is filled with inert gas. The coated glass includes a conductive coating layer provided on its inner surface. The inner heat-insulating soft glue is located around the inner surface of the conductive coating layer and around the inner wall surface of the white glass. A conductive silver paste strip is fixedly provided near one side of the inner surface of the conductive coating layer. The inner edge of the conductive silver paste strip does not exceed the inner edge of the inner heat-insulating soft glue. One end of the conductive silver paste strip is fixedly provided with a welding point for the power supply wire. Near the other side of the inner surface of the conductive coating layer, another conductive silver paste strip is fixedly provided. One end of the conductive silver paste strip is fixedly provided with a welding point for the power supply wire below. The welding point for the power supply wire above and the welding point for the power supply wire below are respectively located at two diagonal positions of the coated glass. Power supply wires are respectively connected to the welding point for the power supply wire above and the welding point for the power supply wire below. The outer ends of the power supply wires are the external connection ends of the power supply wires. The external connection ends of the power supply wires are exposed outside the glass door main body assembly. The conductive coating layer, the conductive silver paste strip and the power supply wires form a conductive heating assembly. An outer support soft glue is provided around the outer periphery of the inner heat-insulating soft glue. The conductive silver paste strip is located outside the inner heat-insulating soft glue, or the conductive silver paste strip is located at the bottom of the inner heat-insulating soft glue. The material of the inner heat-insulating soft glue is thermoplastic glue, and the material of the outer support soft glue is silicone glue. The equivalent thermal conductivity of the thermoplastic adhesive is ≤ 0.24 W / (m·k), and the resistivity is ≥ 10 6 -10 7 ohm·cm.

2. The hollow glass door for a refrigerator cabinet according to claim 1, characterized in that: The distance between the outer surface of the inner heat-insulating soft glue and the outer sides of the coated glass and the white glass is 8 mm - 15 mm.

3. The hollow glass door for a refrigerator cabinet according to claim 1, characterized in that: The width of the conductive silver paste strip is 5 mm - 6 mm.

4. The hollow glass door for a refrigerator cabinet according to claim 1, characterized in that: The width of the inner heat-insulating soft glue is 5.8 mm - 6.8 mm, and the thickness of the inner heat-insulating soft glue is 2 mm - 20 mm.

5. The hollow glass door for a refrigerator cabinet according to claim 1, characterized in that: The width of the inner heat-insulating soft glue is 5.8 mm - 6.8 mm, the thickness of the inner heat-insulating soft glue is 2 mm - 2.5 mm, the distance between the outer surface of the inner heat-insulating soft glue and the outer sides of the coated glass and the white glass is 10 mm - 11 mm, and the width of the conductive silver paste strip is 5.5 mm - 5.6 mm.

6. The hollow glass door for a refrigerator cabinet according to any one of claims 1-5, characterized in that: The external connection end of the power supply wire is located on the side of the hollow glass door of the refrigerator as the rotating shaft.

7. The hollow glass door for a refrigerator cabinet according to any one of claims 1-5, characterized in that: White glass is provided on both sides of the coated glass.

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