Convective method of heating glass sheets using compressed air in conjunction with heated oven air

A technology for compressed air and glass plates, applied in the field of semi-convective pressure/forced air systems, which can solve problems such as slow heat transfer and increased heating cycle time

CN1678539AInactive Publication Date: 2005-10-05玻石服务有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2005-10-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A semi-convective forced air system for heating glass sheets, comprises a heating chamber in an oven, a longitudinal conveyor extending through the heating chamber, a compressed air source, a plurality oflongitudinally-extending compressed air pipes within the chamber, each of said pipes in fluid connection with the compressed air source, each of the pipes oriented parallel to the length of the longitudinal conveyor, the pipes having a series of spaced apart nozzles mounted thereon, a distribution pipe in fluid connection with the air source and the pipes, each of the nozzles having an upper port for receiving heated oven air, a side wall hole for receiving compressed air, a mixing chamber for mixing the compressed air with the oven air to form a hot mix, and a lower port for discharging the mix onto sheets in the oven chamber.
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Description

technical field

[0001] The present invention relates to semi-convective pressure / forced air systems and methods for heating glass sheets for subsequent processing. More specifically, the systems and methods of the present invention are used to heat low-E coated glass sheets (low "e" glass) prior to tempering and then temper the glass sheets. The present invention includes a new and improved nozzle for delivering a hot mixture of compressed air and hot furnace air to a glass sheet in a furnace. technical background

[0002] Prior U.S. Patent No. 5,591,734, issued September 14, 1999 to TGL Tempering Systems, Inc. of Cinnaminson, NJ, which discloses a method for tempering low "e" Semi-convective forced air system for tempering coated glass sheets in which the furnace air manifold is placed along the direction of flow / travel of the glass sheets. The holes in these manifolds that allow compressed air to be blown onto the glass sheet to facilitate heat treatment are small. The ...

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Embodiment Construction

[0020] Referring now to the drawings, FIG. 7 shows a spout 21 in rear view and FIG. 8 shows the spout 21 in front view. Compressed air enters the lance 21 through holes 23, furnace gas is drawn into the lance through upper ports 25, and the compressed air and furnace gas mix in a mixing chamber 26 in the lower part of the lance 21 to form a hot air mixture. This air mixture of compressed air and furnace gas is discharged through the lower port 27 onto the glass sheet S, thereby heating the glass sheet for further processing, such as tempering.

[0021] For ease of processing, the hole 23 has been optimized as a 30° inclined hole, but other angles can also be made. The diameter of the holes is 0.080mm, so particles formed inside the compressed air delivery system can be blown through these holes. The diameter of the holes can be varied as necessary or desired.

[0022] The upper port 25 is flared at the inner bell mouth 29 so that furnace gas can be sucked into the nozzle 21 ...