Argon filling process for special-shaped hollow glass

Abstract

The invention relates to the technical field of production of electrochromic hollow glass, in particular to a special special-shaped hollow glass argon filling process which comprises the following gas filling steps: 1, placing hollow glass by taking a long side as a bottom which is horizontal, arranging a gas needle on a sealing structure corresponding to the bottom of an inner cavity of the hollow glass, an exhaust hole is formed in the sealing structure corresponding to the highest position of the inner cavity of the hollow glass; secondly, an argon concentration detection module is arranged to detect the concentration of argon in the hollow glass in real time; thirdly, the air needle is connected with an air source, inflation is started, and the inflation pressure ranges from 2 bar to 5 bar; fourthly, when the argon concentration detection module detects that the argon concentration close to the exhaust hole in the inner cavity of the hollow glass reaches the standard, inflation is finished, the gas source is rapidly closed, and the exhaust hole is closed. The holes are formed in the sealing structure at the top of the hollow glass and avoid the spacing bars to serve as the exhaust holes, the exhaust holes conduct natural exhaust, balance of air pressure inside and outside a cavity of the hollow glass is kept, air is naturally and orderly exhausted, and the inflation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrochromic hollow glass production, in particular to an argon filling process for special-shaped hollow glass. Background Art

[0002] Filling insulating glass with argon can effectively reduce the convective heat transfer efficiency in the hollow glass cavity, thereby effectively reducing the heat transfer coefficient of the insulating glass and improving the thermal insulation performance of the insulating glass. At the same time, filling with sufficient argon can also effectively protect the offline low-e film layer, delay its oxidation process, and increase the service life of the low-e insulating glass. Argon also has a positive effect on the sound insulation, noise reduction, and UV protection of insulating glass. Therefore, filling the hollow glass cavity with argon has become an effective way to improve the performance of insulating glass.

[0003] According to the national standard GBT11944-2012, the concentration of argon filling in insulating glass needs to reach 85%. At present, there are many technical solutions for argon filling in the industry. For conventional products, air curtain type online fully automatic argon filling process or semi-automatic argon filling equipment is usually used.

[0004] The commonly used argon filling method in the industry is to erect the insulating glass, open a hole at the bottom to inject gas, and open a hole at the top to exhaust naturally. Practice has shown that this argon filling method has the following defects: if the gas injection pressure is high and the exhaust pressure is low, the exhaust is slow and the air pressure is unbalanced, the insulating glass will eventually form a convex shape, and the pressure in the cavity will increase to a certain level before effective exhaust begins, causing the insulating glass to deform; if the gas injection pressure is low, the argon gas will first mix with the air in the cavity of the insulating glass, and then the mixed gas will be discharged, resulting in low inflation efficiency, long inflation time, and large waste of argon gas.

[0005] If the gas injection pressure can be kept neither too high nor too low, but just within the appropriate range and balanced with the exhaust pressure, then the argon concentration can be guaranteed to meet the requirements with one quick inflation. The gas injection pressure in the appropriate range is theoretically related to the exhaust flow rate and the length, width and height of the inner cavity, and the exhaust flow rate changes with the change of the gas injection pressure, so it is difficult to obtain through calculation; but it can be obtained by spending time doing tests before producing a batch of insulating glass, which greatly affects the production efficiency of some small batches of unconventional and special-shaped insulating glass. Summary of the invention

[0006] In view of this, the present invention provides an argon filling process for special shaped insulating glass to solve the problem that a suitable gas injection pressure cannot be quickly obtained when producing small batches of special shaped insulating glass, and thus the argon concentration in the inner cavity of the insulating glass cannot reach the required level through a single rapid filling.

[0007] The present invention provides a special shaped insulating glass filling process with argon gas, and the filling steps are as follows:

[0008] The first step is to place the insulating glass with the long side as the bottom, with the bottom in a horizontal shape, and to set an air needle on the sealing structure corresponding to the bottom of the inner cavity of the insulating glass, and to set an exhaust hole on the sealing structure corresponding to the highest point of the inner cavity of the insulating glass;

[0009] The second step is to set up an argon concentration detection module to detect the argon concentration in the insulating glass in real time;

[0010] The third step is to connect the gas needle to the gas source to start inflation, and the inflation pressure is 2-5 bar;

[0011] In the fourth step, when the argon concentration detection module detects that the argon concentration in the inner cavity of the hollow glass near the exhaust hole reaches the standard, the inflation is stopped, the gas source is quickly turned off, and the exhaust hole is quickly sealed.

[0012] Optionally, in the above second step, the insulating glass is placed vertically.

[0013] Optionally, in the second step, if the height of the insulating glass in the vertical state exceeds 1600 mm or the bottom edge is a large or small piece flash, the insulating glass is placed at an angle of 15 to 45 degrees relative to the vertical plane.

[0014] Optionally, in the first step of the above-mentioned special shaped insulating glass filling process with argon, the sealing structure includes a spacer bar, and a first layer of sealant and a second layer of sealant arranged between the spacer bar and the inner walls of the glass on both sides, and the gas needle and the exhaust hole are arranged on the first layer of sealant before the second layer of sealant is arranged.

[0015] Optionally, in the first step of the above-mentioned process of filling the special-shaped insulating glass with argon, one gas needle is respectively arranged at both ends of the bottom of the insulating glass in the length direction.

[0016] Optionally, the air needle is parallel to the bottom surface of the inner cavity of the hollow glass and is located in the center between the two pieces of glass.

[0017] Optionally, after the first layer of sealant is sealed after inflation is completed, the second layer of sealant is set within 45 minutes.

[0018] Optionally, a 15-25 mm long gap is provided on the first layer of sealant as the vent hole.

[0019] Optionally, the first sealant is butyl sealant.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. A hole is opened on the sealing structure at the top of the insulating glass to avoid the spacer bar as an exhaust hole. The exhaust hole is naturally exhausted to maintain the balance of air pressure inside and outside the hollow glass cavity. Only when the air pressure is balanced can the air be discharged naturally and orderly; the filling time of this case is reduced, the cost is saved, the operation is simpler and easier, and the argon injection of special-shaped insulating glass products can be completed without auxiliary equipment; this case does not need to open a hole on the spacer bar, which avoids the molecular sieve powder in the spacer bar from being filled into the cavity, and also avoids the uncertainty of the sealing process after the hole in the spacer bar is opened.

[0022] 2. When the inclination angle is small or the glass is placed vertically, for large-format insulating glass, the air in the cavity is compressed when argon is injected and the pressure of the compressed air above on the argon below is downward. Therefore, the pressure of the argon injected into the cavity needs to be increased. The increased pressure is likely to form turbulence, which reduces the air exhaust efficiency. When the glass is placed at a large inclination angle, the downward pressure of the compressed air above acts mostly on the glass surface, and a very small component of the downward pressure acts on the argon below. Therefore, the argon injection is easy to rush directly to the top of the insulating glass, and the air is more likely to mix to the lower part. The closer the insulating glass is tilted to the horizontal state, the easier it is to mix, resulting in reduced inflation efficiency. Keep the insulating glass at an appropriate angle of 15 to 45 degrees, and the argon will gradually accumulate from the bottom, so that the air can be discharged more easily without greater pressure.

[0023] 3. The exhaust hole does not pump air, but exhausts air by slowly injecting inert gas to maintain the balance of air pressure inside and outside the insulating glass. Only when the air pressure is balanced can the air be discharged naturally and orderly; if the exhaust is slow, the internal air pressure is higher than the external air pressure, which is easy to form an outer bulge in the glass cavity, and the internal argon and air are more likely to mix, reducing the effective filling efficiency; if the exhaust is too fast, the filling pressure is small, and the air pressure in the cavity is small, then the advantage of the heavy self-weight of argon is lost, making it easy for argon and air to be discharged together, which will also reduce the effective filling efficiency.

[0024] 4. The exhaust hole is not expanded by inserting a tube, but a gap is directly opened on the first elastic sealant as the exhaust hole. The exhaust hole will expand or tighten according to the change of the pressure difference inside and outside the insulating glass, so there is no need to fine-tune the inflation pressure to achieve the adjustment of the exhaust flow rate, so that the internal and external air pressures are always balanced during the inflation process.

[0025] 5. Different from the traditional method of opening holes in the spacer for inflation, it avoids the molecular sieve powder in the spacer from being blown into the inner cavity of the hollow glass, and also avoids the uncertainty of the sealing process after the hole in the spacer is opened.

[0026] 6. By adopting multi-hole low-pressure injection, the air pressure inside and outside the insulating glass is more balanced, it is not easy to mix, and the air is discharged more efficiently. Argon can be injected quickly and stably and reach an argon content of more than 85%.

[0027] 7. This solution can use a small-aperture gas needle to inject argon gas, which can reduce the damage to the butyl rubber on the side of the spacer and make it easier to fully seal the gas needle hole.

[0028] 8. By applying the open exhaust principle, the air pressure inside and outside the insulating glass is the same, the air exhaust efficiency is high, and the insulating glass will not have the defect of bulging due to argon filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Schematic diagram of a special-shaped insulating glass structure with triangular edges in an embodiment;

[0031] Figure 2 Schematic diagram of a special shaped insulating glass structure with irregular edges in an embodiment;

[0032] Figure 3 Schematic diagram of a special shaped insulating glass structure with irregular edges in an embodiment;

[0033] Figure 4 Schematic diagram of a special-shaped insulating glass structure with arc edges in an embodiment;

[0034] Figure 5 Schematic diagram of the structure of the insulating glass with large and small flashes in the embodiment;

[0035] Figure 6 Schematic diagram of the sealing structure in the embodiment.

[0036] In the figure: air needle 1, exhaust hole 2, spacer strip 3, first layer of sealant 4, second layer of sealant 5. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0040] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0041] The terms "comprises," "includes," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed. Figures 1 to 4 The embodiment of the present invention provides a special shaped insulating glass filling process with argon gas, which is suitable for irregular edges with triangular edges, arc edges and large and small flash edges (see Figure 5 ) is filled with argon to ensure that the argon concentration in the inner cavity of the insulating glass is ≥85%.

[0042] The main steps of filling with argon are: the first step is to place the insulating glass with the long side as the bottom and the bottom in a horizontal shape, and set an air needle 1 on the sealing structure corresponding to the bottom of the inner cavity of the insulating glass, and set an exhaust hole 2 on the sealing structure corresponding to the highest point of the inner cavity of the insulating glass; the second step is to set an argon concentration detection module to detect the argon concentration in the insulating glass in real time; the third step is to connect the air needle 1 to the gas source to start inflation, and the inflation pressure is 2-5bar; the fourth step is to stop inflation when the argon concentration detection module detects that the argon concentration near the exhaust hole 2 in the inner cavity of the insulating glass reaches the standard, and quickly turn off the gas source and quickly close the exhaust hole 2.

[0043] Compared with the prior art solution of drilling holes on the spacer bars for inflation and then exhausting air through the exhaust holes, the special argon filling process for special-shaped insulating glass proposed in the present invention has the following advantages: a hole is opened on the sealing structure at the top of the insulating glass to serve as an exhaust hole, avoiding the spacer bars. The exhaust holes are naturally exhausted, maintaining the balance of air pressure inside and outside the hollow glass cavity. Only when the air pressure is balanced can the air be discharged naturally and orderly; the filling time of this case is reduced, the cost is saved, the operation is simpler and easier, and the argon injection of special shaped insulating glass products can be completed without the need for auxiliary equipment; this case does not require drilling holes on the spacer bars, which avoids the molecular sieve powder in the spacer bars from being filled into the cavity, and also avoids the uncertainty of the sealing process after the spacer bars are opened.

[0044] The exhaust hole does not pump air, but exhausts air by slowly injecting inert gas, which maintains the balance of air pressure inside and outside the insulating glass. Only when the air pressure is balanced can the air be discharged naturally and orderly; if the exhaust is slow, the internal air pressure is higher than the external air pressure, which is easy to cause the glass cavity to bulge outward, and the internal argon and air are more likely to mix, reducing the effective filling efficiency; if the exhaust is too fast, the filling pressure is small, and the air pressure in the cavity is small, then the advantage of argon's heavy self-weight is lost, making it easy for argon and air to be discharged together, which will also reduce the effective filling efficiency.

[0045] For details, please refer to Figure 6 The sealing structure includes a spacer 3, a first sealant 4 and a second sealant 5. The spacer 3 is located in the middle between two parallel glass sheets. The spacer 3 is hollow and filled with molecular sieves. The first and second sealants 4 and 5 are filled between the opposite sides of the spacer 3 and the glass. The first sealant 4 is made of butyl rubber, which is located on the inner side of the second sealant 5. The exhaust hole 2 is a 15-25mm long gap opened on the first sealant 4 at the top of the insulating glass; please refer to Figure 1 and Figure 6 An air needle 1 is arranged at each end of the length direction of the bottom of the insulating glass. The air needle 1 is inserted at both ends of the length direction of the first sealant 4 at the bottom of the insulating glass. The air needle 1 is located in the center between the two pieces of glass and is parallel to the bottom surface of the inner cavity of the insulating glass. The air needle 1 and the exhaust hole 2 are arranged before the second sealant 5 is arranged.

[0046] In the argon filling process of the above-mentioned special shaped insulating glass, argon should be filled within 1 hour after the glass is assembled; after the filling is completed and the first layer of sealant is sealed, the second layer of sealant should be set within 45 minutes.

[0047] In the above-mentioned argon filling process, all types of insulating glass can be inflated in a vertical state; but in order to improve the inflation efficiency, for insulating glass with flash on the bottom edge and special shape that cannot be placed flat, the insulating glass is placed at an angle of 15 to 45 degrees relative to the vertical plane for inflation, preferably 30 degrees, and there is no need to make a special bottom support device, the process is simplified and the operation is easy; in order to improve the inflation efficiency, if the insulating glass meets the requirement of a height of more than 1600mm in a vertical state or meets the requirement of a large or small flash on the bottom edge, the insulating glass is placed at an angle of 15 to 45 degrees relative to the vertical plane for inflation, preferably 30 degrees; specifically, for triangular glass, quadrilateral glass or polygonal glass, the long side is the bottom and the sharp corner is facing upward. If the bottom edge is a large or small flash, it can be placed at an angle of 30 degrees.

[0048] When the tilt angle is small or the glass is placed vertically, for large-format insulating glass, the air in the cavity is compressed when the argon is injected and the pressure of the compressed air above on the argon below is downward, so the pressure of the argon injected into the cavity needs to be increased, and the increased pressure is easy to form turbulence, which reduces the air exhaust efficiency; when the glass is placed at a large tilt angle, the downward pressure of the compressed air above acts mostly on the glass surface, and a small component of the downward pressure acts on the argon below, so the argon injection is easy to directly rush to the top of the insulating glass, and the air is more likely to mix to the lower part, and the closer the insulating glass is tilted to the horizontal state, the easier it is to mix, resulting in reduced inflation efficiency. Keep the insulating glass at an appropriate 30-degree tilt angle, and the argon will gradually accumulate from the bottom, so that the air can be discharged more easily without greater pressure.

[0049] The argon filling process for special-shaped insulating glass provided in this embodiment can be used to fill triangular-shaped insulating glass with large and small flashes, as well as polygonal, irregular-edged and arc-shaped special insulating glass, with an argon filling rate of ≥85%. The specific filling process is as follows:

[0050] 1. After the insulating glass is positioned and assembled, before applying the second coat of sealant, argon gas is filled (Note: argon gas needs to be filled within 1 hour after assembly to prevent excessive moisture absorption of the molecular sieve in the spacer);

[0051] 2. The insulating glass is placed on a special bracket, placed vertically or when the above conditions are met (the height of the insulating glass in the vertical state exceeds 1600mm or the bottom edge is a large or small piece of flash), it is placed at an angle of 30 degrees, and the padding protection of the bottom edge is done well;

[0052] 3. Insert two air needles 1 from the gap between the spacer and the glass (5mm upward from the corner) at the two corners of the lower bottom edge of the insulating glass. The air needles 1 are parallel to the bottom edge of the insulating glass, and the two air needles 1 are set opposite to each other;

[0053] 4. Slightly open a 15-25mm gap in the butyl rubber at the top corner as an exhaust hole 2, preferably 20mm, and send the detection head of the argon concentration detection module into the cavity through the gap. The detection head is located at the top of the cavity and is connected to the host of the argon concentration detection module through a thin data cable;

[0054] 5. Open the gas cylinder connected to the gas needle 1, release the pressure, and control the inflation pressure at 2-5 bar (low-pressure inflation, minimize the mixed flow of argon and air in the cavity, and use the characteristics of argon gas with high density and heavy weight to discharge the air from the exhaust hole 2 on the upper part of the glass from bottom to top);

[0055] 6. The data transmitted to the main unit of the argon concentration detection module by the detection head is used to detect the argon concentration near the exhaust hole 2 at the top of the cavity in real time. If the argon concentration reaches 85%, the gas cylinder is immediately closed, the inflation is stopped, and the first sealant 4 at the top corner of the glass is quickly sealed. The bottom corner gas needle 1 is pulled out and the needle hole is sealed;

[0056] 7. After the inflation is completed, carefully check the sealing quality of the inflation and exhaust positions and perform additional sealing;

[0057] 8. After the insulating glass is inflated and sealed, the second sealant 5 coating process shall be started within 45 minutes.

[0058] The above argon filling process has the following advantages:

[0059] 1. Solved the problem of insufficient argon filling in special-shaped and unconventional insulating glass;

[0060] 2. The open exhaust principle is applied, and the air pressure inside and outside the cavity is the same, the air exhaust efficiency is high, and the insulating glass will not cause the defect of bulging due to argon filling;

[0061] 3. The air pressure inside and outside the cavity is balanced, the exhaust is fast, and it is not easy to cause excessive mixing of argon and air, which saves argon and reduces loss;

[0062] 4. Reduce the time of argon filling and greatly improve the efficiency of argon filling;

[0063] 5. Different from the traditional method of opening holes in the spacer for inflation, it avoids the molecular sieve powder in the spacer from being blown into the inner cavity of the hollow glass, and also avoids the uncertainty of the sealing process after the hole in the spacer is opened;

[0064] 6. By adopting multi-hole low-pressure injection, the air pressure inside and outside the insulating glass is more balanced, it is not easy to mix, and the air is discharged more efficiently. Argon can be injected quickly and stably and reach an argon content of more than 85%.

[0065] 7. This solution can use a small-aperture gas needle to inject argon, which can reduce the damage to the butyl rubber on the side of the spacer and make it easier to fully seal the gas needle hole;

[0066] 8. The air needle and the exhaust hole do not damage the spacer, do not bring gas impact to the molecular sieve, will not blow the molecular sieve into the cavity, and will not affect the filling amount of the molecular sieve in the spacer;

[0067] 9. Butyl rubber is used as the first sealant to make local sealing easier to operate. After inflation is completed, butyl rubber is appropriately filled and the sheets can be reclosed with a certain pressure to form a complete seal on the edge;

[0068] 10. The argon filling process has certain requirements on the coating amount of butyl rubber on the side of the spacer, thereby improving the durability of the gas sealing of the insulating glass. For the traditional special-shaped and unconventional insulating glass where argon is easy to leak and glass is easy to fog, the argon retention rate is improved and the service life of the insulating glass is extended.

[0069] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A special shaped insulating glass filling process, characterized in that: The inflation steps are as follows: The first step is to place the insulating glass with the long side as the bottom, with the bottom in a horizontal shape, and to set an air needle on the sealing structure corresponding to the bottom of the inner cavity of the insulating glass, and to set an exhaust hole on the sealing structure corresponding to the highest point of the inner cavity of the insulating glass; The second step is to set up an argon concentration detection module to detect the argon concentration in the insulating glass in real time; The third step is to connect the gas needle to the gas source to start inflation, and the inflation pressure is 2-5 bar; In the fourth step, when the argon concentration detection module detects that the argon concentration in the inner cavity of the hollow glass near the exhaust hole reaches the standard, the inflation is stopped, the gas source is quickly turned off, and the exhaust hole is quickly sealed.

2. The argon filling process for special shaped insulating glass according to claim 1 is characterized in that: In the second step, the insulating glass is placed vertically.

3. The argon filling process for special shaped insulating glass according to claim 1 is characterized in that: In the second step, if the height of the insulating glass in the vertical state exceeds 1600mm or the bottom edge meets the requirement of large and small piece flash, the insulating glass is placed at an angle of 15 to 45 degrees relative to the vertical plane.

4. The argon filling process for special-shaped insulating glass according to claim 2 or 3, characterized in that: In the first step, the sealing structure includes a spacer bar, and a first layer of sealant and a second layer of sealant arranged between the spacer bar and the inner walls of the glass on both sides, and the air needle and the exhaust hole are arranged on the first layer of sealant before the second layer of sealant is arranged.

5. The argon filling process for special shaped insulating glass according to claim 2 or 3, characterized in that: In the first step, one gas needle is respectively arranged at both ends of the bottom of the insulating glass in the length direction.

6. The argon filling process for special shaped insulating glass according to claim 5 is characterized in that: The air needle is parallel to the bottom surface of the inner cavity of the hollow glass and is located at the center between the two sheets of glass.

7. The argon filling process for special shaped insulating glass according to claim 4 is characterized in that: After the inflation is completed and the first layer of sealant is sealed, the second layer of sealant is set within 45 minutes.

8. The argon filling process for special shaped insulating glass according to claim 4 is characterized in that: A 15-25 mm long gap is provided on the first sealant as the vent hole.

9. The argon filling process for special shaped insulating glass according to claim 4 is characterized in that: The first sealant is butyl sealant.

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