Negative pressure vacuum glass

Abstract

The utility model provides negative pressure vacuum glass which comprises lower glass and upper glass, the upper glass and the lower glass are overlapped, and a vacuum gap is reserved between the upper glass and the lower glass; the sealing strip consists of a sealing part and an extending part; the sealing part is arranged on the periphery of the upper glass and the periphery of the lower glass and seals the vacuum gap, the extending part is fixedly arranged in the middle of the sealing part and extends into the vacuum gap, and the surface of the extending part is attached to the mirror surface of the upper glass and the mirror surface of the lower glass. A plurality of supporting columns are bonded between the upper glass and the lower glass. The hollow glass is good in sealing performance and long in service life.

Description

Technical Field

[0001] The utility model relates to negative pressure vacuum glass. Background Art

[0002] At present, the traditional negative pressure vacuum glass is made by evenly placing supporting glass particles on the lower layer of glass, covering the upper layer with a piece of glass, applying sealant or sealing solder on the four sides, solidifying it, leaving only one exhaust port to be vacuumed with a vacuum pump, and sealing the exhaust port. Then, the method of sealing first and then vacuuming between the glass will result in low forming yield and low productivity. This is because the subsequent vacuuming will cause certain damage to the sealing between the glass, and will change the adhesiveness of the glue between the glass, thereby destroying the negative pressure performance. Therefore, designing a negative pressure vacuum glass with high forming rate, good sealing, and no change in the adhesiveness of the glue is the research direction of the utility model. Utility Model Content

[0003] The utility model provides a negative pressure vacuum glass, which can effectively solve the above problems.

[0004] The utility model is achieved in this way:

[0005] A negative pressure vacuum glass, comprising

[0006] A lower glass and an upper glass, wherein the upper glass and the lower glass are overlapped and a vacuum gap is reserved;

[0007] The sealing strip is composed of a sealing portion and an extending portion;

[0008] The sealing part is arranged around the upper glass and the lower glass and seals the vacuum gap, the extending part is fixedly arranged in the middle of the sealing part, the extending part extends into the vacuum gap, the surface of the extending part is in contact with the mirror surface of the upper glass and the lower glass, and a plurality of support columns are bonded between the upper glass and the lower glass;

[0009] A groove is arranged on the surface of the extending portion, and the groove surrounds the periphery of the upper glass and the lower glass;

[0010] The upper end of the sealing portion is higher than the upper surface of the upper glass, and the lower end of the sealing portion is lower than the lower surface of the lower glass.

[0011] As a further improvement, a plurality of the support columns are arranged at equal intervals along the surface of the lower glass.

[0012] As a further improvement, the outer edge of the sealing portion is in an arc shape.

[0013] As a further improvement, at least two groups of grooves are provided on the extending portion.

[0014] As a further improvement, the groove is biased towards the left side of the middle part of the protruding portion.

[0015] As a further improvement, the cross-section of the groove is semicircular, square or rectangular.

[0016] As a further improvement, the upper and lower ends of the sealing portion protrude from the upper glass and the lower glass by a distance of 0.5 to 1 mm.

[0017] The beneficial effects of the utility model are:

[0018] (1) The groove of the present invention is arranged to be biased toward the left of the middle of the insertion part, so as to make the spacing between the groove and the plurality of support pillars equal, thereby ensuring that the force on the upper glass is more uniform; in other words, if the groove is arranged too far to the right or / and to the left, and the spacing between the groove and the plurality of support pillars is not equal, then the force-bearing area of ​​the insertion part will deviate, thereby causing damage or deformation of the insertion part, which is not conducive to long-term use.

[0019] (2) The cross section of the groove provided in the present invention is semicircular. This is because the shape of the semicircular groove is smoother and has no edges and corners. Therefore, when subjected to force, the stress can be dispersed around the groove, and the force distribution is more uniform and not easy to deform. The shape of the square groove or rectangular groove has edges and corners, which will make the stress along the same direction, thereby increasing the degree of stress concentration. Therefore, under the same load, the stress concentration of the square groove or rectangular groove is greater, which is easy to cause damage and deformation of the material.

[0020] (3) The upper and lower ends of the sealing part provided in the utility model protrude from the upper glass and the lower glass, which is to protect the glass from being squeezed by hard objects during installation.

[0021] (4) The outer edge of the sealing portion provided in the utility model is in an arc shape. This is so that when the sealing portion is impacted by an external force, the impact force can be dispersed to avoid the force being concentrated on one point, thereby better protecting the vacuum glass and preventing the vacuum glass from being damaged. Furthermore, the sealing portion completely covers the outermost proportional edges of the upper glass and the lower glass, so as to reduce the side edges of the upper glass and the lower glass and eliminate the right-angle chamfering process, and can also protect personnel during transportation. When necessary, the sealing portion can be turned outward to completely wrap the edge of the glass.

[0022] (5) The plurality of support columns provided in the present invention are arranged at equal intervals along the surface of the lower glass, so that when the upper glass is subjected to external force, the surface in contact with the support columns is subjected to uniform force, thereby preventing cracks or separation in the sealant between the upper glass and the support columns, improving the connectivity between the upper glass and the support columns, and further improving the firmness of the two. On the other hand, it is also beneficial to the sealing of the upper glass.

[0023] (6) In order to prevent the sealing strip from being partially exposed to the air and causing aging, shrinkage, sand holes, cracks, etc., a vacuum belt is formed between the portion of the sealing strip extending into the vacuum gap and the contact surface between the upper glass and the lower glass. The vacuum belt has the effect of performing secondary reinforcement on the extending portion. Because the negative pressure of the same pressure exists in the vacuum belt, the friction between the extending portion and the upper glass and the lower glass can be increased, thereby achieving a fixing effect. In addition, the secondary formation of the vacuum belt can effectively prevent the aging of the contact surface, thereby making the vacuum glass more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of the upper vacuum cavity and the lower vacuum cavity of the utility model.

[0026] Figure 2 It is a structural schematic diagram of the lower glass and the upper glass of the utility model.

[0027] Figure 3 It is a cross-sectional view of the lower glass, upper glass and sealing part of the utility model.

[0028] Figure 4 It is an enlarged view of A of the present utility model.

[0029] Figure 5 It is a simple equipment structure diagram of the utility model.

[0030] Figure 6 It is a front view of the simple device of the utility model.

[0031] Description of Figure Numbers:

[0032] 1. Upper vacuum chamber; 2. Lower vacuum chamber; 3. Turning mechanism; 4. Support frame; 5. Cylinder; 7. Upper pressure plate; 8. Lower support; 9. Sealing edge; 10. Air extraction hole; 11. Lower glass; 12. Support column; 13. Sealing part; 14. Upper glass; 15. UV lamp; 16. Insertion part; 17. Groove;

[0033] 18. Frame; 19. Support plate; 20. Lifting mechanism; 21. Top plate; 22. Hollow sealing frame; 23. Lower glass. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.

[0035] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Reference Figure 1-4 As shown, a negative pressure vacuum glass comprises a lower glass 11 and an upper glass 14. The upper glass 14 and the lower glass 11 are overlapped and a vacuum gap is reserved.

[0037] As a further improvement, in order to prevent the sealing strip from being partially exposed to the air and causing aging, shrinkage, sand holes, cracks and other problems, a vacuum belt is formed between the contact surface between the insertion portion 16 of the sealing strip extending into the vacuum gap and the upper glass 14 and the lower glass 11. The vacuum belt has the effect of performing secondary reinforcement on the insertion portion 16. Because the negative pressure of the same pressure in the vacuum belt can increase the friction between the insertion portion 16 and the upper glass 14 and the lower glass 11, a fixing effect is achieved. In addition, the secondary formation of the vacuum belt can effectively prevent aging of the contact surface, thereby making the vacuum glass more durable.

[0038] The sealing strip is composed of a sealing portion 13 and an extending portion 16; the sealing portion 13 is arranged around the upper glass 14 and the lower glass 11 and seals the vacuum gap, and the extending portion 16 is fixedly arranged in the middle of the sealing portion 13, and the extending portion 16 extends into the vacuum gap, and the surface of the extending portion 16 is in mirror-conformity with the upper glass 14 and the lower glass 11. A plurality of support columns 12 are bonded between the upper glass 14 and the lower glass 11.

[0039] A groove 17 is disposed on the surface of the protruding portion 16 , and the groove 17 surrounds the periphery of the upper glass 14 and the lower glass 11 .

[0040] As a further improvement, preferably, at least two groups of grooves 17 are provided on the insertion portion 16; as a further improvement, preferably, the grooves 17 are biased to the left of the middle of the insertion portion 16. This is to make the spacing between the grooves 17 and the plurality of support columns 12 equal, so as to ensure that the force on the upper glass 14 is more uniform; in other words, if the grooves 17 are set too far to the right or / and to the left, and the spacing between the grooves 17 and the plurality of support columns 12 is not equal, then the force area of ​​the insertion portion 16 will be deviated, thereby causing the insertion portion 16 to be damaged or deformed, which is not conducive to long-term use.

[0041] The cross section of the groove 17 is semicircular, square or rectangular. Preferably, the cross section of the groove 17 is semicircular. This is because the shape of the semicircular groove is more rounded, without edges and corners, so when subjected to force, the stress can be dispersed around the groove, the force is more evenly distributed, and it is not easy to deform; while the shape of the square groove or rectangular groove has edges and corners, which will make the stress along the same direction, thereby increasing the degree of stress concentration. Therefore, under the same load, the stress concentration of the square groove or rectangular groove is greater, which is easy to cause damage and deformation of the material.

[0042] The upper end of the sealing part 13 is higher than the upper surface of the upper glass 14, and the lower end of the sealing part 13 is lower than the lower surface of the lower glass 11. Furthermore, the upper and lower ends of the sealing part 13 protrude from the upper glass 14 and the lower glass 11 by a distance of 0.5 to 1 mm. In one embodiment, in order to protect the glass from being squeezed by hard objects during installation, the upper and lower ends of the sealing part 13 protrude from the upper glass 14 and the lower glass 11 by a height of about 1 mm. If the height is too high, it will affect the subsequent installation; if the height is too low, it will not be able to protect the vacuum glass, resulting in the vacuum glass being squeezed by hard objects and damaged.

[0043] A plurality of support columns 12 are bonded between the upper glass 14 and the lower glass 11; the plurality of support columns 12 are arranged at equal intervals along the surface of the lower glass 11, so that when the upper glass 14 is subjected to external force, the surface in contact with the support columns 12 is subjected to uniform force, thereby preventing cracks or separation in the sealant between the upper glass 14 and the support columns 12, improving the connectivity between the upper glass 14 and the support columns 12, and further improving the firmness of the two. On the other hand, it is also beneficial to the sealing of the upper glass 14.

[0044] Of course, if the sealing of the vacuum glass is improved, the heat insulation and noise reduction functions of the vacuum glass will also be correspondingly better.

[0045] It should be noted that the diameter of the support column 12 is determined by the vacuum degree of the vacuum glass cavity. The higher the vacuum degree, the greater the corresponding strength of the support column 12 and the larger the diameter. The specific needs are selected according to actual needs and will not be elaborated here.

[0046] The outer edge of the sealing part 13 is in an arc shape. This is to disperse the impact force when the sealing part 13 is impacted by external force, so as to avoid the force being concentrated at one point, thereby better protecting the vacuum glass and preventing the vacuum glass from being damaged; further, the sealing part 13 completely covers the outermost proportional edges of the upper glass 14 and the lower glass 11, so as to reduce the side edges of the upper glass 14 and the lower glass 11 and eliminate the chamfering process of the right-angle edges, and can also protect the personnel during transportation, and when necessary, the sealing part 13 can be turned outward to completely wrap the glass edges.

[0047] As a further improvement, preferably, the cross section of the sealing portion 13 is T-shaped. Furthermore, the T-shaped side surround can greatly reduce the gluing process of the glass corners, and is also convenient for on-site installation and protection.

[0048] It is worth mentioning that the vacuum fit between the "T"-shaped concave sealing strip and the inner side of the glass forms a vacuum "waterproof wall" to provide a guarantee for the negative pressure performance of the hollow inner glue.

[0049] When installing the original glass, sealant is applied on one of the glass pieces, and then the two glass pieces are pasted together. A small hole is reserved between the two glass pieces so that the air between the two glass pieces can be extracted. When the space between the two glass pieces is in a vacuum state, the small hole is sealed to form a vacuum glass. Although this method can also form a vacuum glass, it is too cumbersome in actual operation. Preferably, in this case, a plurality of equally spaced support columns 12 are provided on the upper glass 14, and the upper glass is placed on a work surface under a vacuum environment. The support columns 12 of the upper glass 14 are also coated with sealant, and then a sealing strip is placed on the edges of the upper glass. Then, the lower glass 11 is pressed with the upper glass 14 and the sealing strip through the equipment, and the three are fixed and sealed. The sealing strip can help limit the lower glass 11, ensure that the lower glass 11 is placed flush with the upper glass 14, and improve the sealing of the entire vacuum glass. Therefore, compared with the original vacuum glass installation and vacuuming method, the effect of this case is better.

[0050] The utility model further provides a method for preparing negative pressure vacuum glass, comprising the following steps:

[0051] S1, the upper glass 14 and / or the lower glass 11 are stacked and placed on an automatic loading machine, and the glass and the adhesive strip are bonded to ensure that their surfaces are clean and flat;

[0052] S2, the material taking arm sucks the upper glass 14 and / or the lower glass 11 onto the conveyor line. After the conveyor line is positioned, the glue dispenser dispenses glue and dispenses glue around the entire circle of the bonding part with the sealing part 13. Several support columns 12 are automatically and precisely glued to the lower glass 11, and the glue points are lightly pressed. The UV lamp 15 solidifies the bonding position between the support columns 12 and the lower glass 11;

[0053] S3, after the pre-curing of the UV lamp 15 is completed, the four-axis robot moves the lower glass 11 bonded with the support column 12 into the vacuum chamber;

[0054] S4, the upper vacuum chamber 1 is turned over by the turning mechanism 3 and fastened with the lower vacuum chamber 2, the vacuum pump is started, and the air in the chamber is extracted through the exhaust hole 10 in the lower vacuum chamber 2. After reaching the predetermined vacuum degree, the cylinder 5 in the upper vacuum chamber 1 is actuated to press the upper glass 14 down to the sealing part 13 to fit tightly, and the pressure is maintained. After that, the cylinder 5 is retracted, and the UV lamp 15 is started for curing. After curing, the upper vacuum chamber 1 is lifted and turned over to the receiving position;

[0055] S5, proceed to the next cycle.

[0056] Specifically, in step S4, air is evacuated from the space of the merged upper vacuum chamber 1 and the lower vacuum chamber 2 by a vacuum pump to form a vacuum environment therebetween, and sensors are also provided inside the upper vacuum chamber 1 and the lower vacuum chamber 2. When the vacuum environment in the upper vacuum chamber 1 and the lower vacuum chamber 2 reaches a preset value, the flipping structure drives the upper glass 14 to flip, the cylinder 5 is triggered, and the upper glass 14 is pressed down onto the sealing portion 13 and adhered to the support column 12 on the lower glass 11. The sealing portion 13 wraps the upper glass 14, and the cylinder 5 forms a vacuum chamber between the upper glass 14 and the lower glass 11 because of the support column 12. Then, the UV lamp 15 cures the glue on the glass to achieve a sealing effect, thereby completing the installation of the hollow glass. At the same time, the flipping mechanism 3 is used to flip the upper vacuum chamber 1 and fasten it to the lower vacuum chamber 2. The flipping mechanism 3 is also connected to a support frame to support the upper vacuum chamber 1.

[0057] Specifically, in step S3 , the UV lamps 15 are arranged around the upper glass 14 and the lower glass 11 , and cure the glue on the upper glass 14 and the lower glass 11 .

[0058] Furthermore, a sealing edge 9 is clamped between the upper vacuum chamber 1 and the lower vacuum chamber 2 to completely seal the upper vacuum chamber 1 and the lower vacuum chamber 2 . A lower support 8 is provided in the lower vacuum chamber 2 to place the lower glass 11 .

[0059] Furthermore, in order to ensure the seal between the upper glass 14 and the lower glass 11, as a preference, a pressure-sensitive paper is also provided. When the cylinder 5 drives the upper glass 14 to be pressed down to the sealing portion 13 and fit with the lower glass 11, the pressure-sensitive paper is subjected to force, and the microcapsules in the colorant layer are broken by the pressure, and the color-developing dye seeps out and is adsorbed by the color-developing layer, thereby producing a chemical reaction to display red. The microcapsules on the color-developing layer have various sizes and strengths and are uniformly coated on the color-developing layer, so when subjected to pressure, different color-developing concentrations will be obtained according to the pressure size. The contact pressure distribution and pressure value are obtained by scanning, thereby determining whether the sealing contact pressure of the contact surface under test meets the sealing requirements.

[0060] It should be noted that the specific model of pressure-sensitive paper and its usage principle will not be elaborated here.

[0061] Specifically, in order to obtain the pressure value more accurately, a pressure analysis system can also be set up, such as the FPD-8010-E system prior art, which will not be described here. The pressure analysis through this system is more accurate and more diverse. This system has improved the previous products and has better performance. Using this system, the pressure value is displayed and the full-color picture can be analyzed on the display, so that the pressure value can be obtained quickly and accurately.

[0062] Before step S2, set the dispensing parameters of the dispenser.

[0063] Before the S5 step, a four-axis robot comes to suck the bonded products into the unloading station.

[0064] In step S2, the dispensing parameters of the glue dispenser include the dispensing pressure and the dispensing time, and the dispensing pressure is set to 0.3±0.1MPa. Generally speaking, in the actual production process, the production parameters of the previous day are generally maintained, but due to slight changes in the environment, even if the dispensing pressure is the same, it will easily cause the subsequent dispensing amount to change. In order to precisely control the dispensing amount, it is necessary to calibrate the dispensing amount. Specifically, in the utility model, the mass difference before and after the dispensing can be tested, so that the dispensing parameters can be accurately adjusted. For example, the mass of the initial support column 12 is m. After the dispensing machine is used for dispensing, a new mass n is obtained. Through nm, the mass difference f is obtained. If the value of f exceeds the preset range of the dispensing machine parameters, the dispensing machine parameters are readjusted. If the value of f is within the parameter range, the dispensing is performed normally. Generally speaking, the dispensing time is not easy to adjust. Preferably, the utility model mainly calibrates the subsequent dispensing amount by adjusting the dispensing pressure. The setting of the dispensing pressure is generally 0.3±0.1MPa, that is, it floats within this range. Preferably, the dispensing air pressure is generally set to 0.3±0.06MPa.

[0065] It should be noted that if the glue dispensing air pressure is too high, the amount of glue dispensing on the support column 12 will be too large, which may easily lead to the end of the support column 12 that is bonded to the lower glass 11 being unable to be bonded to the lower glass 11 more stably. One end of the support column 12 may also be skewed during bonding due to excessive amount of glue, which may cause the upper glass 14 and the lower glass 11 to be unable to be supported by the support column 12, and when the upper glass 14 is pressed downward by the cylinder 5, a vacuum cavity cannot be formed between the upper glass 14 and the lower glass 11, causing certain difficulties in subsequent use.

[0066] Specifically, the glue type for dispensing is not limited. In one embodiment, a low-temperature curing glue such as 5520PLUS-LV low-temperature curing glue is selected, and its curing time is generally 5-10 hours. The type of the dispensing needle of the dispensing machine is also not limited, and is selected according to actual needs.

[0067] In order to better understand, the utility model specially designed a simple negative pressure vacuum glass preparation device, referring to Figure 5 and Figure 6 ,in,

[0068] It includes a frame 18, a hollow sealing frame 22 is provided at the top opening end of the frame 18, a lifting mechanism 20 is provided at the bottom opening of the frame 18, a top plate 21 is provided at one end of the lifting mechanism 20, and a support plate 19 is provided in the middle of the frame 18 and away from the lifting mechanism 20, wherein the support plate 19 and the top plate 21 support the lower glass 23; when the lifting mechanism 20 is opened, the lower glass 23 gradually rises and enters the lower end opening of the hollow sealing frame 22, and the upper end opening of the hollow sealing frame 22 is pre-provided with an upper glass (not shown in the figure), and the lower glass 23 and the upper glass are contacted and bonded by glass adhesive strips.

[0069] The simple negative pressure vacuum glass preparation device also includes the negative pressure vacuum glass preparation steps:

[0070] S1. Glue the upper glass and glass adhesive strip together and make sure their surfaces are clean and flat;

[0071] S2, placing the upper glass and the glass adhesive strip at a designated position in the vacuum chamber;

[0072] S3, start the vacuum system to evacuate the cavity in the hollow sealing frame 22 and form a vacuum environment, which can remove air and moisture, reduce the generation of bubbles, and provide a better fitting effect;

[0073] S4, using the existing technology of the lifting mechanism 20, which will not be described in detail here, to lift up the lower glass 23 so that it contacts and fits with the glass adhesive strip in the hollow sealing frame 22. The lifting height and speed can be adjusted according to specific needs;

[0074] S5. After the bonding is completed, the vacuum environment is maintained for a period of time to consolidate the bonding effect;

[0075] S6. When the bonding is completed and the desired effect is achieved, release the vacuum and take out the bonded vacuum glass.

[0076] It should be noted that the specific vacuum chamber glass lifting and bonding process may vary depending on the size of the workpiece. In actual operation, it is necessary to adjust and optimize according to the specific situation to ensure the bonding quality and efficiency. At the same time, during the bonding process, the position, pressure or other parameters of the lifting mechanism 20 can be adjusted to ensure that the adhesive strip and the glass are tightly and smoothly bonded.

[0077] The simple device designed by the above-mentioned utility model does not conflict with the device applied for.

[0078] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A negative pressure vacuum glass, characterized in that: The negative pressure vacuum glass comprises: A lower glass (11) and an upper glass (14), wherein the upper glass (14) and the lower glass (11) are overlapped and a vacuum gap is reserved; A sealing strip, comprising a sealing portion (13) and an extending portion (16); The sealing portion (13) is arranged around the upper glass (14) and the lower glass (11) and seals the vacuum gap; the extending portion (16) is fixedly arranged in the middle of the sealing portion (13); the extending portion (16) extends into the vacuum gap; and the surface of the extending portion (16) is in mirror-contact with the upper glass (14) and the lower glass (11); A plurality of support columns (12) are bonded between the upper glass (14) and the lower glass (11); A groove (17) is provided on the surface of the protruding portion (16), and the groove (17) surrounds the periphery of the upper glass (14) and the lower glass (11); The upper end of the sealing portion (13) is higher than the upper surface of the upper glass (14), and the lower end of the sealing portion (13) is lower than the lower surface of the lower glass (11).

2. The negative pressure vacuum glass according to claim 1, characterized in that: A plurality of support columns (12) are arranged at equal intervals along the surface of the lower glass (11).

3. The negative pressure vacuum glass according to claim 1, characterized in that: The outer edge of the sealing portion (13) is in an arc shape.

4. The negative pressure vacuum glass according to claim 1, characterized in that: At least two groups of grooves (17) are provided on the protruding portion (16).

5. The negative pressure vacuum glass according to claim 1, characterized in that: The groove (17) is biased towards the left side of the middle part of the protruding portion (16).

6. The negative pressure vacuum glass according to claim 1, characterized in that: The cross section of the groove (17) is semicircular, square or rectangular.

7. The negative pressure vacuum glass according to claim 1, characterized in that: The upper and lower ends of the sealing portion (13) protrude from the upper glass (14) and the lower glass (11) by a distance of 0.5 to 1 mm.

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