The following disclosure relates generally to insulating glazing apparatus (including insulated glazing units and vacuum insulating glazing units) having spaced-apart glazing panes. More specifically, it relates to insulating glazing apparatus having compliant seals for providing an airtight seal between the spaced-apart panes of an insulating glazing apparatus, apparatus comprising such seals, and methods for manufacture of same.
Insulating glazing units (IGUs) comprise two or more glass lites (panes) separated by one or more volumes which are sealed and then filled with an insulating gas mixture and/or partially evacuated to create at least one insulating cavity. Vacuum insulating glazing units (VIGUs) comprise two or more glass lites separated by one or more volumes which are sealed and evacuated to create at least one insulating vacuum cavity. The volume between the lites is sealed around its perimeter (or edge) by an edge seal. The edge seal is a part (or assembly of parts) that is bonded to one lite, spans across the gap between the two lites, and is bonded to the second lite. At any time after the IGU/VIGU has been assembled, the first lite may have a difference in temperature from the second lite. The temperature difference leads to differential expansion or contraction and, therefore, relative motion between the glass lites. A rigid edge seal strongly resists the relative motion between the lites, thereby creating a buildup of thermal stresses within the IGU/VIGU assembly. A need therefore exists, for a compliant edge seal that permits relative motion between the glass lites, thereby reducing the stresses created in the IGU/VIGU assembly due to thermal distortions. Minimization of the thermal stresses is desirable to prevent IGU/VIGU failure in climates where significant temperature differences between adjacent lites are encountered.
The relative motion between adjacent lites in any region along the perimeter of the IGU/VIGU can be broken into two components, both of which are oriented parallel to the planes of the lites. The relative motion normal to the planes of the lites is relatively small, and is therefore not included. The two components parallel to the planes of the lites are herein defined relative to the edge seal. The motion component oriented along the length of any portion of the edge seal is herein defined as the longitudinal component and the motion component oriented at a right angle (i.e., normal) to the longitudinal component and parallel to the planes of the lites is herein defined as the lateral component. At any given point around the perimeter of the IGU/VIGU assembly, there are generally longitudinal and lateral components of relative motion between the lites at any given time. The relative motion is believed to be largest near the corners in the case of a rectangular IGU/VIGU. A need therefore exists, for an edge seal that offers compliance in both the longitudinal and lateral directions.
The edge seal for an IGU/VIGU is generally constructed of a thin sheet of material. For VIGUs, the edge seal must be hermetic, and thus is generally constructed of a thin hermetic sheet of material. The sheet material is formed in some fashion around the edge of the IGU/VIGU. The geometry of the edge seal dictates that relative motion of the lites in the longitudinal direction is largely accommodated by a shearing action of the edge seal while relative motion of the lites in the lateral direction is largely accommodated by bending of the edge seal material. Thin sheet material is relatively rigid in response to a shearing action and relatively compliant in response to a bending action. As a result, longitudinal (shear) compliance is generally more difficult to obtain than lateral (bending) compliance in an IGU/VIGU edge seal when the edge seal is formed of a thin sheet of material. A need therefore exists, for an edge seal having improved longitudinal (shear) compliance.
This disclosure describes edge seals for IGUs and/or VIGUs that are highly compliant in response to longitudinal and lateral components of relative motion between the two adjacent lites attached to one another through the edge seal.
In one embodiment, an insulating glazing unit comprises a first lite formed from a hermetic transparent material and a second lite formed from a hermetic transparent material and spaced-apart from the first lite to define an insulating cavity therebetween. An edge seal is hermetically bonded between the respective edges of the first lite and the second lite, the edge seal being formed from a hermetic material. The edge seal includes a compliant region having a surface formed in a three-dimensional pattern.
In another embodiment, an insulating glazing unit comprises a first lite formed from a hermetic transparent material and a second lite formed from a hermetic transparent material that is spaced-apart from the first lite to define an insulating cavity therebetween. An edge seal assembly includes an outer member, a first inner member and a second inner member, each of the outer member, first inner member and second inner member being formed of hermetic materials. An inner surface of first inner member is hermetically bonded to an outer edge of the first lite, an inner surface of second inner member is hermetically bonded to an outer edge of the second lite, the outer surface of the first inner member is hermetically bonded to a first inner edge of the outer member, and the outer surface of the second inner member is hermetically bonded to a second inner edge of the outer member. The edge seal includes a compliant region having a surface formed in a three-dimensional pattern.
In another embodiment, a method of manufacturing an insulating glazing unit is provided. The method comprises the following steps: a) providing a length of first inner member, wrapping the length of inner member around a first lite, cutting and joining the first inner member to itself at the location where it would otherwise overlap itself, and joining the first inner member to the edge of the first lite where it is coincident after wrapping; b) providing a length of second inner member, wrapping the length of inner member around a second lite, cutting and joining the second inner member to itself at the location where it would otherwise overlap itself, and joining the second inner member to the edge of the second lite where it is coincident after wrapping; c) positioning the first lite and the second lite in a spaced-apart configuration forming an insulating cavity; d) providing a length of an outer member having a compliant region with a three-dimensional surface pattern, wrapping the outer member around the assembly of first and second lites and first and second inner members, cutting and joining the outer member to itself at the location where it would otherwise overlap itself and joining the outer member to each one of the inner members to form a pair of continuous seals; and e) evacuating the insulating cavity and sealing the insulating cavity.
For a more complete understanding, reference is now made to the following description taken in conjunction with the accompanying drawings in which:
Referring now to the drawings, wherein like reference numbers are used herein to designate like elements throughout, the various views and embodiments of a method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit are illustrated and described, and other possible embodiments are described. The figures are not necessarily drawn to scale, and in some instances the drawings have been exaggerated and/or simplified in places for illustrative purposes only. One of ordinary skill in the art will appreciate the many possible applications and variations based on the following examples of possible embodiments.
For purposes of this application, the term “hermetic” as applied to a material or a seal shall mean (unless otherwise specifically denoted) that, when used to form a sealed cavity and subjected to a pressure differential of approximately one atmosphere (i.e., in air), the material or seal has a permeability or “leak rate” that is sufficiently low such that the internal pressure within the sealed cavity changes by less than 1 mtorr (i.e., 1×10−3 torr) over a period of at least ten years, and preferably over a period of 30-40 years. For example, if the initial pressure within the sealed cavity is 1×10−4 torr, the materials and/or seals forming the cavity would be considered hermetic for ten years if the pressure within the sealed cavity after ten years is still less than 1.1×10−3 torr. In another example, if the initial pressure within the sealed cavity is 5×10−5 torr, the materials and/or seals forming the cavity would be considered hermetic for thirty years if the pressure within the sealed cavity after thirty years is less than 1.05×10−3 torr.
Referring now to
Referring now to
The edge seal 204 of VIGU 200 includes a compliant region 208 having a surface formed in a three-dimensional pattern. The three-dimensional pattern of the compliant region 208 may be formed by imprinting, stamping, embossing, roll-forming or other known methods of metal-forming. The compliant region 208 provides greater compliance to the edge seal 204 to accommodate relative motion between the lites 201 and 202 in the lateral direction (denoted by arrow 206) and/or in the longitudinal directions (denoted by arrow 207), as compared to edge seals without the three-dimensional compliant region. This greater compliance may result in a reduction of thermally-induced stress in the lites 201 and 202, e.g., in the area where the edge seal 204 is bonded to the lites, as well as in the compliant edge seal itself. In the embodiment illustrated in
Referring now to
Specifically,
Referring now to
Referring now to
Referring now to
Referring now to
As best seen in
In a VIGU, the insulating cavity is evacuated to a vacuum. In one embodiment, the hermetic materials are hermetic for at least ten years. In another embodiment, the hermetic materials are hermetic for at least thirty years. In yet another embodiment, the hermetic materials are hermetic for at least forty years. In a preferred embodiment, the insulating cavity is evacuated to a vacuum within the range of 1×10−6 torr to 1×10−3 torr. Alternatively, an insulating glazing unit (IGU) (not shown) may be constructed in a substantially identical fashion, except the materials and seals need not be hermetic and the atmosphere within the insulating cavity is a partial vacuum and/or filed with an insulating gas or gas mixture. As describe above, the evacuation, partial evacuation or (in the case of IGUs) filling with insulating gasses of the insulating cavity may be achieved at the time of sealing the insulating cavity by sealing it while the VIGU/IGU is in, respectively, a vacuum chamber, a partial vacuum chamber or a gas-filled chamber. Alternatively, the evacuation and/or filling of the insulating cavity may be achieved after the insulating cavity has been sealed via a pinch-off tube or pump-out tube.
As best seen in
As seen in
Referring now to
Referring now to
Referring now to
Referring now to
Referring now to
Referring now to
The compliant portion 1320 of the edge seal 1305 may have a surface formed in a three-dimensional pattern, e.g., the three-dimensional patterns previously described in connection with
Referring now to
Referring still to
Referring now to
Referring now to
Referring now to
The compliant portion 1420 of the edge seal 1405 may have a surface formed in a three-dimensional pattern, e.g., the three-dimensional patterns previously described in connection with
Referring now to
Referring still to
Referring now to
Referring now to
Referring now to
A preferred method for forming the hermetic bonds, e.g., the hermetic bonds 1330 or 1430 previously described, is by ultrasonic soldering using a flux-free solder. Suitable flux-free solder and ultrasonic soldering equipment are produced by Cerasolzer, for example Cerasolzer GS 217 solder or GS 220 solder. In a preferred embodiment, the surfaces of the edge seal and the lites that are to be bonded in the hermetic bond have solder pre-applied (i.e., known as “pre-tinning”). Further, at least the surfaces to be hermetically bonded, and preferably the entire lites, are preheated to a pre-heat temperature above the solder's liquidus temperature prior to forming the hermetic bonds.
In one embodiment, the following steps are used: (1) Pre-heat the glass lite and pre-tin the perimeter of the glass lite using ultrasonic soldering; (2) Pre-tin the inside of the metal edge band that will later be wrapped around and soldered to the glass lite; (3) The metal edge band does not have to be pre-heated but it is preferable to do so before ultrasonically solder pre-tinning its surface; (4) Use tooling (
Ultrasonic excitation is applied to the part of the metal band that extends past the edge of the glass and have the band-tensioning fixture apply the pressure to keep the metal band in very close contact with the glass edge. The band and glass cannot be in intimate contact as we have solder between the two and want to achieve a hermetic soldered bond or connection.
Referring now to
It will be appreciated by those skilled in the art having the benefit of this disclosure that this method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit provides an insulating glazing unit having greatly improved performance and lifespan. It should be understood that the drawings and detailed description herein are to be regarded in an illustrative rather than a restrictive manner, and are not intended to be limiting to the particular forms and examples disclosed. On the contrary, included are any further modifications, changes, rearrangements, substitutions, alternatives, design choices, and embodiments apparent to those of ordinary skill in the art, without departing from the spirit and scope hereof, as defined by the following claims. Thus, it is intended that the following claims be interpreted to embrace all such further modifications, changes, rearrangements, substitutions, alternatives, design choices, and embodiments.
This application is a continuation of U.S. application Ser. No. 15/141,485 filed Apr. 28, 2016, which is a continuation of U.S. application Ser. No. 13/464,951 filed May 4, 2012, which claims the benefit of U.S. provisional application No. 61/482,701 filed on May 5, 2011. application Ser. Nos. 15/141,485, 13/464,951 and 61/482,701 are incorporated-by-reference herein in their entirety.
This invention was made with government support under Contract No. DE-EE0004024 awarded by the Department of Energy. The Government has certain rights in this invention.
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Number | Date | Country | |
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20190071920 A1 | Mar 2019 | US |
Number | Date | Country | |
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61482701 | May 2011 | US |
Number | Date | Country | |
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Parent | 15141485 | Apr 2016 | US |
Child | 16180931 | US | |
Parent | 13464951 | May 2012 | US |
Child | 15141485 | US |