Insulating glazing with double spacer

Abstract

An insulating glazing includes a first pane, a second pane, an inner spacer frame arranged between the panes, which, together with the panes, delimits an inner interpane space, a surrounding outer spacer frame arranged between the panes, which is arranged on the outward facing side of the inner spacer frame, wherein the inner spacer frame consists substantially of a first hollow profile spacer and the outer spacer frame consists substantially of a second hollow profile spacer, the inner spacer frame and the outer spacer frame are in each case connected together to the first pane and the second pane via a primary sealant, an outer interpane space between the outer side of the outer spacer frame and the first pane and the second pane is filled with a secondary sealant.

Claims

1. An insulating glazing comprising: a first pane, a second pane, an inner spacer frame arranged between the first and second panes, which, together with the first and second panes, delimits an inner interpane space, a surrounding outer spacer frame arranged between the first and second panes, which is arranged on the outward facing side of the inner spacer frame, wherein the inner spacer frame consists substantially of a first hollow profile spacer and the outer spacer frame consists substantially of a second hollow profile spacer, wherein the inner spacer frame and the outer spacer frame are each connected to the first pane and the second pane via a primary sealant, wherein an outer interpane space between an outer side of the outer spacer frame, the first pane, and the second pane is filled with a secondary sealant, wherein an electrically switchable functional element is arranged on a side of one of the first and second panes facing the inner interpane space, wherein an element to be concealed is arranged on one of the first and second panes, which element is arranged between the first hollow profile spacer and the one of the first and second panes such that the element to be concealed is concealed by the first hollow profile spacer, wherein the element to be concealed is a bus bar or a cable that is connected to the electrically switchable functional element, wherein the first hollow profile spacer and the second hollow profile spacer each comprise a first pane contact wall, a second pane contact wall, a glazing interior wall that connects the first and second pane contact walls to one another, and an outer wall that runs substantially parallel to the glazing interior wall and connects the first and second pane contact walls to one another, wherein the first pane contact wall, the second pane contact wall, the glazing interior wall and the outer wall of the first hollow profile spacer are different from the first pane contact wall, the second pane contact wall, the glazing interior wall and the outer wall of the second hollow profile spacer, wherein at least the first hollow profile spacer is implemented such that the first pane contact wall is connected to the outer wall via a first connecting wall and the second pane contact wall is connected to the outer wall via a second connecting wall, wherein the first and second connecting walls have an angle of 30° to 60° relative to, respectively, the first and second pane contact walls, as a result of which two intermediate spaces are created, which are in each case delimited by one of the first and second panes, the first hollow profile spacer, and the second hollow profile spacer, and wherein in at least one of the two intermediate spaces, a cable or wire is routed over a distance of at least 5 cm in a direction of extension of the spacer frame.

2. The insulating glazing according to claim 1, wherein a width b1 of the first hollow profile spacer is smaller than a width b2 of the second hollow profile spacer.

3. The insulating glazing according to claim 2, wherein the width b 1 of the first hollow profile spacer is 0.1 mm to 1 mm smaller than the width b2 of the second hollow profile spacer.

4. The insulating glazing according to claim 1, wherein at least the first hollow profile spacer is substantially made of a polymeric material.

5. The insulating glazing according to claim 4, wherein the second hollow profile spacer is made substantially of a polymeric material.

6. The insulating glazing according to claim 1, wherein the first hollow profile spacer contains a desiccant in a first hollow chamber and the first hollow profile spacer contains a plurality of openings in its glazing interior wall.

7. The insulating glazing according to claim 1, wherein the second hollow profile spacer has a gas- and moisture-tight barrier at least on its outer wall.

8. A method for producing an insulating glazing according to claim 1 comprising: providing a first pane, securing an outer spacer frame made of a second hollow profile spacer on the first pane via a primary sealant, securing an inner spacer frame made of a first hollow profile spacer on the first pane via the primary sealant, wherein the outer spacer frame surrounds the inner spacer frame, securing a second pane on the arrangement composed of the first pane and the inner and outer spacer frames via a primary sealant, filling the outer interpane space between the first pane, the second pane, and the side of the outer spacer frame facing the external environment with a secondary sealant.

9. The method for producing an insulating glazing according to claim 8, wherein the inner spacer frame is attached such that the inner spacer frame covers an element to be concealed that is arranged on the first pane and/or on the second pane.

10. A method comprising utilizing an insulating glazing according to claim 1 as a building glazing.

Description

(1) In the following, the invention is explained in detail with reference to drawings. The drawings are a purely schematic representation and not to scale. They in no way restrict the invention. The drawings depict:

(2) FIG. 1 a cross-section through the edge region of an insulating glazing with a single spacer frame,

(3) FIG. 2 a cross-section through the edge region of an insulating glazing according to the invention with a double spacer frame, and

(4) FIG. 3 a schematic representation of a possible cable routing in the space between two spacer frames.

(5) FIG. 1 depicts a representation of an insulating glazing in cross-section. The insulating glazing comprises a first pane 1 and a second pane 2 that are joined via a hollow profile spacer 7. The hollow profile spacer 7 is attached between the first pane 1 and the second pane 2 arranged parallel thereto. The hollow profile spacer 7 has a main body, which has a first pane contact wall 21, a second pane contact wall 22, which runs parallel to the first pane contact wall, an outer wall 24, and a glazing interior wall 23. The outer wall 24 is connected to the two pane contact walls 21, 22 via a connecting wall 25 or 26, respectively. The first connecting wall 25 has an angle α (alpha) of approx. 45° relative to the first pane contact wall. Analogously, the second connecting wall 26 is arranged at an angle of 45° relative to the second pane contact wall 22. The hollow profile spacer has a hollow chamber, which contains a molecular sieve as a desiccant 13. Openings 14 in the form of slots made after the fact, via which a connection is established between the hollow chamber and an inner interpane space 5, are made in the glazing interior wall 23. The inner interpane space 5 is defined by the first pane 1, the second pane 2, and the glazing interior wall 23 of the hollow profile spacer. The first pane 1 is connected to the first pane contact wall 21 via a primary sealant 8, and the second pane 2 is connected to the second pane contact wall 22 via a primary sealant 8. An outer interpane space 10 is delimited by the first pane 1, the second pane 2, and the outer wall 24 of the hollow profile spacer and is completely filled with a secondary sealant 9. A gas- and vapor-tight barrier film 15 in the form of a multilayer film with two 25-nm-thick aluminum layers and two 12-μm-thick polyethylene terephthalate layers, arranged alternatingly, is attached to the outer wall 24, the first connecting wall 25, the second connecting wall 26, and part of the first and second pane contact wall 21,22. This barrier film 15 improves the tightness against penetration of moisture.

(6) The second pane 2 has an electrically conductive and/or electrically switchable coating 17 (electrical functional element) on the surface facing the inner interpane space 5. The coating 17 extends almost completely over the inside surface of the pane 2, minus an edge decoating of the edge of the pane. The coating 17 is contacted by a bus bar 18. The insulating glazing has an electrical connection cable 19 that can be connected to a voltage source (not shown). The electrical connection cable 19 and the bus bar 18 are electrically conductively connected to one another via an electrical contact element 20. The electrical contact between the electrically conductive and/or electrically switchable coating 17 and the bus bar 18 and between the bus bar 18 and the contact element 20 can be established by soldering or gluing with an electrically conductive adhesive. The contact element 20 can be a flexible cable. The cable can be T-shaped and have two metallic contacting surfaces on its two side arms, which are provided for contacting with the bus bar 18.

(7) The bus bar 18 was produced by printing a conductive paste and electrically contacted on the electrical functional element 17. The conductive paste, also referred to as silver paste, contains silver particles and glass frits. The layer thickness of the baked conductive paste is, for example, approx. 5 μm to 20 μm. Alternatively, thin and narrow metal foil strips or metal wires that contain or are formed from copper, a copper alloy, or aluminum can also be used as a bus bar 18. The bus bar 18 extends on the second pane 2 in the inner interpane space 5 and parallel to the glazing interior wall 23 of the hollow profile spacer.

(8) The first pane 1 is provided on the outside with an opaque coating 16 which is a black masking print. The coating is implemented in the form of a strip and begins at the glass edge and then extends beyond the upper end of the bus bars 18, such that the bus bar 18 is well concealed when looking through the first pane 1 from as many viewing angles as possible. In the example, the first pane is the pane that faces toward the building interior. The masking print 16 thus prevents the view of the bus bar when looking through the pane from the inside of the building. The masking print 16 restricts the through-vision region of the insulating glazing. Applying a second masking print on the second pane is optionally possible. Such a second masking print would conceal the bus bar when looking from the outside of the building.

(9) FIG. 2 depicts an edge region of an insulating glazing I according to the invention, in cross-section. The insulating glazing corresponds substantially to the insulating glazing depicted in FIG. 1, except that the single spacer frame made of a hollow profile spacer 7 depicted in FIG. 1 is replaced by a double spacer frame of a first hollow profile spacer 6 and a second hollow profile spacer 7 and the masking print 16 depicted in FIG. 1 is not present. Apart from these differences, the information for FIG. 1 also applies to FIG. 2.

(10) The insulating glazing I has an inner spacer frame 4 consisting of a first hollow profile spacer 6. The main body of the first hollow profile spacer 6 is made of styrene acrylonitrile with 20% glass fiber content and is opaque. The inner spacer frame 4 is composed of four individual sections of the first hollow profile spacer 6, which are joined to one another by welding at the corners of the insulating glazing. The first hollow profile spacer 6 has a first hollow chamber 11, into which a molecular sieve 13 is filled. The molecular sieve 13 absorbs the moisture out of the inner interpane space 5 via the openings 14 in the glazing interior wall of the first hollow profile spacer 6.

(11) Arranged adjacent the outer wall 24 of the first hollow profile spacer is a second hollow profile spacer 7, which forms the outer spacer frame 3. The outer spacer frame 3 is composed of individual sections of the second hollow profile spacer 7 and welded at the corners. Both hollow profile spacers 6 and 7 are made of the same material. Thus, stresses due to different coefficients of expansion of different materials are avoided. No sealant or adhesive is arranged between the two spacer frames 3 and 4. They are arranged against one another without deliberately planned gaps. For production-related reasons, there can be a small distance of as much as half a millimeter between between the two spacer frames.

(12) The second hollow profile spacer has a gas- and vapor-tight barrier 15 in the form of a multilayer film, as already described for FIG. 1, on its outer wall, the two connecting walls, and a part of the side walls. The gas- and vapor-tight barrier 15 overlaps the primary sealant 8, which is arranged between the panes 1, 2 and the two pane contact walls 21 and 22. In this manner, good sealing of the inner interpane space is achieved. The second hollow profile spacer 7 has no openings in its glazing interior wall. These are not necessary since no desiccant is contained in the second hollow chamber 12. The second hollow chamber 12 is empty. This improves the thermal insulating property of the hollow profile spacer compared to a filled hollow chamber 12.

(13) The first and the second hollow profile spacer 6, 7 are both 6.5 mm high. The height of the bus bars 18 is approx. 4 mm. Thus, the bus bar is completely covered by the first hollow profile spacer 6. The bus bar 18 is mounted between the second pane contact wall of the first hollow profile spacer 6 and the second pane 2 on the electrically switchable functional element 17 as an element to be concealed. Thus, the inner spacer frame 4 obstructs the view of the bus bar 18, when looking through the first pane. Consequently, no masking print is arranged on the first pane 1. This reduces the number of production steps, improves the visual appearance of the insulating glazing, and avoids thermal stresses due to different heating of the printed and non-printed regions. If concealment of the element to be concealed is desired when looking through the second pane is desired, a masking print would have to be arranged there.

(14) The first hollow profile spacer 6 has a first connecting wall 25, which forms, together with the the first pane 1 and the glazing interior wall of the second hollow profile spacer 7, a first intermediate space 27. In the example, the first intermediate space 27 is empty and thus provides space to accommodate a cable or wire or the like. Alternatively, the first intermediate space 27 can, for example, also be filled with the primary sealant. This intermediate space 27 forms a circumferential space between the inner and the outer spacer frame. The first hollow profile spacer 6 has a second connecting wall 26, which delimits, together with the second pane 2 and the glazing interior wall of the second hollow profile spacer 7, a second intermediate space 28. In this second intermediate space, there is, for example, space for the electrical contact element 20. Since the connection point between the electrical connection cable 19 and the bus bar 18 is not arranged between the second pane contact wall and the second pane, the connection between the inner spacer frame 4 and the second pane 2 is particularly good. This contributes to a longer service life of the insulating glazing.

(15) The width b1 of the first hollow profile spacer 6 is 12 mm and is the same as the width b2 of the second hollow profile spacer b2. This is particularly advantageous since substantially the same hollow profile spacer can be used for the inner and the outer spacer frame, since they differ only in the gas- and vapor-tight barrier and the openings in the glazing interior wall.

(16) Alternatively, b1 could be <b2 leaving space for the bus bar 18 and an electrical contact element between the second pane 2 and the second pane contact wall of the first hollow profile spacer 6. This is particularly advantageous if there are no angled connecting walls and thus no intermediate spaces 27, 28, as would be the case, for example, with a rectangular cross-section of the first hollow profile spacer 6.

(17) FIG. 3 depicts an example of cable routing in an intermediate space between an inner spacer frame 4 and an outer spacer frame 3. The arrangement of the two spacer frames is as depicted in FIG. 2, as a result of which two intermediate spaces 27, 28 are created. An electrical connection cable 19 is now routed along in one of these intermediate spaces. At an entry point, the electrical connection cable leads, starting from the external voltage source 29 along a pane contact wall of the second hollow profile spacer 7 into an intermediate space 27 or 28 and leads from there to a contact point. FIG. 3 depicts two electrical connection cables 19, which lead to two contact points in the region of the inner spacer frame 3, where, for example, a bus bar can be situated in each case, which can be contacted via these connection cables 19. The routing along one complete side of the spacer frame is visually advantageously hidden from the view of the observer by the arrangement between the inner and the outer spacer frame. At the same time, routing in the outer interpane space in the finished insulating glazing is avoided, which is advantageous for production.

LIST OF REFERENCE CHARACTERS

(18) I insulating glazing

(19) 1 first pane

(20) 2 second pane

(21) 3 outer spacer frame

(22) 4 inner spacer frame

(23) 5 inner interpane space

(24) 6 first hollow profile spacer

(25) 7 second hollow profile spacer

(26) 8 primary sealant

(27) 9 secondary sealant

(28) 10 outer interpane space

(29) 11 first hollow chamber

(30) 12 second hollow chamber

(31) 13 desiccant

(32) 14 opening

(33) 15 gas- and vapor-tight barrier

(34) 16 masking print, opaque coating

(35) 17 electrically switchable functional element, electrically switchable coating

(36) 18 bus bar

(37) 19 electrical connection cable

(38) 20 electrical contact element

(39) 21 first pane contact wall

(40) 22 second pane contact wall

(41) 23 glazing interior wall

(42) 24 outer wall

(43) 25 first connecting wall

(44) 26 second connecting wall

(45) 27 first intermediate space

(46) 28 second intermediate space

(47) 29 external voltage source

(48) b1 width of the first hollow profile spacer

(49) b2 width of the second hollow profile spacer