Heat-insulating outward-opening glass window with built-in hardware notch
By using thermal break strips to connect the outer and inner window frames, and the outer and inner sash frames of the glass window, increasing the thickness, and using a cross-arm support structure, the problems of poor thermal insulation and interference in opening and closing of existing glass windows are solved, achieving efficient thermal insulation and stable opening and closing.
Patent Information
- Application Number
- CN202422962143.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The existing window frames and sashes of outward-opening glass windows with built-in hardware slots are thin, resulting in poor thermal insulation effect, and the window sashes are prone to interference when opening, affecting normal opening and closing.
By using window frame thermal insulation strips and window sash thermal insulation strips to connect the outer and inner window frames and the outer and inner sash frames respectively, the thickness of the window frame and window sash is increased. The heat transfer path is reduced and the load-bearing capacity is enhanced by using cross-arm support arms and main load-bearing arms. A dovetail snap-fit structure is designed to ensure a stable connection.
It improves the heat insulation and overall energy efficiency of the glass window, avoids interference between the window sash and the window, ensures that the window can be opened and closed normally under long-term use, and enhances the stability and sealing of the window.
Smart Images
Figure CN223446900U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of window heat insulation, and in particular to a built-in hardware notch heat insulation out-opening glass window. BACKGROUND
[0002] The existing built-in hardware notch out-opening glass window has a relatively thin window frame, so that the distance between the outer profile and the inner profile is relatively short, the thickness of the heat insulation strip installed between the outer profile and the inner profile is relatively small, and the heat insulation effect of the window frame is affected. Meanwhile, the relatively thin window frame makes the thickness of the sash installed on the window frame also relatively thin, the overall thickness of the multiple layers of glass installed on the sash is affected, the setting gap between the glasses is generally small, and the heat insulation effect of the out-opening glass window is affected. The sash is usually installed on the window frame through a sliding support, if the thickness of the window frame and the sash is directly increased, interference between the sash frame and the window frame will be caused when the sash is opened out, the closing effect of the sash and the sealing effect between the sash and the window frame are affected, the thickening of the window frame and the sash is limited, and therefore the length of the support arm in the sliding support needs to be increased to adapt to the widened sash and window frame, the weight of the widened sash and window frame is increased, and the support arm is lengthened, so that the bending moment borne by the support arm is increased, the support arm is prone to deformation, and the normal opening and closing of the sash are affected. CONTENT OF THE UTILITY MODEL
[0003] In order to improve the heat insulation effect of the glass window and enable the glass window to be normally opened and closed in long-term use, the application provides a built-in hardware notch heat insulation out-opening glass window.
[0004] The built-in hardware notch heat insulation out-opening glass window provided by the application adopts the following technical scheme:
[0005] The built-in hardware notch heat insulation out-opening glass window comprises an outer window frame, an inner window frame, an outer sash frame and an inner sash frame, the outer window frame and the inner window frame are connected through a window frame heat insulation strip, the outer sash frame and the inner sash frame are connected through a window sash heat insulation strip, one side of the inner window frame is rotationally connected with a support arm, a main force arm and a cross arm are rotationally and slidingly connected to the inner window frame, the main force arm and the support arm are commonly hinged with a window sash mounting strip at the end away from the inner window frame, the cross arm is hinged with the main force arm and the support arm, the window sash mounting strip and the cross arm are parallel to each other, the main force arm and the support arm are parallel to each other, and the cross arm supports the main force arm and the support arm.
[0006] By adopting the technical scheme, the outer sash frame and the inner sash frame are connected only through the window sash heat insulation strips, the outer window frame and the inner window frame are connected only through the window frame heat insulation strips, heat can only be transferred through the heat insulation strips, the direct contact between the outer window frame and the inner window frame and between the outer sash frame and the inner sash frame is interrupted, and the heat transfer between the outer window and the inner window mainly depends on the material properties of the heat insulation strips, so that the heat conduction path is reduced, and the energy efficiency and the heat insulation effect of the whole window are improved.
[0007] The cross arm supports the support arm and the main force arm, the load bearing capacity of the support arm and the main force arm is improved, the design thickness of the window sash heat insulation strip, the window frame heat insulation strip, the outer sash frame, the inner sash frame, the outer window frame and the inner window frame can be increased, and the support arm and the main force arm can be appropriately increased, when the outer sash frame and the inner sash frame are opened, the outer sash frame and the inner sash frame can be moved to a position farther away from the outer window frame and the inner window frame, so that the interference condition is further avoided, so that the heat insulation effect is improved by increasing the overall thickness, and the thickened glass window can be normally opened and closed under long-term use.
[0008] Optionally, the inner window frame is provided with a sliding rail, the main force arm and the cross arm are both hinged with a sliding block, and the sliding block is slidingly connected to the sliding rail.
[0009] Optionally, the outer window frame comprises an outer main frame and an outer auxiliary frame, the inner window frame comprises an inner main frame and an inner auxiliary frame, and the window frame heat insulation strip comprises a main frame heat insulation strip and an auxiliary frame heat insulation strip.
[0010] The inner main frame is connected to the outer main frame through the main frame heat insulation strip, the outer auxiliary frame is connected to the inner auxiliary frame through the auxiliary frame heat insulation strip, the outer main frame is connected to the outer auxiliary frame, and the inner main frame is connected to the inner auxiliary frame.
[0011] Optionally, opposite sides of the outer sash frame and the inner sash frame are both provided with a first clamping groove along the height direction of each side, two sides of the window sash heat insulation strip are both provided with a first clamping block, and the first clamping block is clamped into the first clamping groove on the same side.
[0012] Opposite sides of the outer main frame and the inner main frame are both provided with a second clamping groove along the height direction of each side, two sides of the main frame heat insulation strip are both provided with a second clamping block, and the second clamping block is clamped into the second clamping groove on the same side.
[0013] Opposite sides of the outer auxiliary frame and the inner auxiliary frame are both provided with a third clamping groove along the height direction of each side, two sides of the auxiliary frame heat insulation strip are both provided with a third clamping block, and the third clamping block is clamped into the third clamping groove on the same side.
[0014] By adopting the technical scheme, the outer auxiliary frame and the inner auxiliary frame, the outer main frame and the inner main frame, and the outer sash frame and the inner sash frame are conveniently mounted and dismounted in the form of clamping, and the window sash heat insulation strip, the main frame heat insulation strip and the auxiliary frame heat insulation strip are conveniently replaced.
[0015] Optionally, the first clamping block, the second clamping block and the third clamping block are dovetail blocks, and the first clamping groove, the second clamping groove and the third clamping groove are dovetail grooves.
[0016] By adopting the technical scheme, the dovetail structure has high connection strength and stability, the firmness of the installation of the window sash heat insulation strip, the main frame heat insulation strip and the auxiliary frame heat insulation strip is ensured, the window sash heat insulation strip, the main frame heat insulation strip and the auxiliary frame heat insulation strip are effectively prevented from loosening or falling off, and the overall stability and heat insulation effect of the window are improved.
[0017] Optionally, opposite sides of the outer auxiliary frame and the inner auxiliary frame are commonly provided with heat insulation protection plates, the auxiliary frame heat insulation strip is located between the heat insulation protection plates and the main frame heat insulation strip, and the heat insulation protection plates cover the auxiliary frame heat insulation strip.
[0018] By adopting the technical scheme, the protection of the auxiliary frame heat insulation strip is increased, and the performance of the auxiliary frame heat insulation strip is prevented from being affected by direct damage from the outside.
[0019] Optionally, the outer sash frame and the window sash heat insulation strip are provided with waterproof strips, the waterproof strip on the outer sash frame abuts against the outer auxiliary frame when the outer sash frame and the inner sash frame are closed, and the waterproof strip of the window sash heat insulation strip abuts against the heat insulation protection plate.
[0020] By adopting the technical scheme, the waterproof performance of the window is improved, rainwater or moisture is prevented from entering the room through the gaps of the outer sash frame and the outer auxiliary frame and the gaps of the window sash heat insulation strip and the heat insulation protection plate, and the sealing performance and durability of the window are improved.
[0021] Optionally, a bumper strip is mounted on the side of the inner sash frame facing the room, and the bumper strip abuts against the inner auxiliary frame when the outer sash frame and the inner sash frame are closed.
[0022] Optionally, the thickness of the main frame heat insulation strip is greater than 45 mm, and the total thickness of the outer main frame, the inner main frame and the main frame heat insulation strip is greater than 110 mm.
[0023] The thickness of the auxiliary frame heat insulation strip is greater than 35 mm, and the total thickness of the outer auxiliary frame, the inner auxiliary frame and the auxiliary frame heat insulation strip is greater than 105 mm.
[0024] The thickness of the window sash heat insulation strip is greater than 30 mm, and the total thickness of the outer sash frame, the inner sash frame and the window sash heat insulation strip is greater than 75 mm.
[0025] Optionally, the inner sash frame and the outer sash frame are jointly provided with at least three layers of hollow glass, and the gap between each layer of the hollow glass is greater than 10mm.
[0026] By adopting the above technical scheme, the design of the multi-layer hollow glass further improves the sound insulation and heat insulation performance of the window, the gap greater than 10mm can effectively prevent heat conduction, and the energy saving effect is further improved.
[0027] In summary, the present application has at least one of the following beneficial technical effects:
[0028] 1. The outer sash frame and the inner sash frame are connected only through the window sash heat insulation strip, and the outer window frame and the inner window frame are connected only through the window frame heat insulation strip. Heat can only be transferred through the heat insulation strip. The direct contact between the outer window frame and the inner window frame, and the outer sash frame and the inner sash frame is interrupted. The heat transfer between the outer window and the inner window mainly relies on the material properties of the heat insulation strip, reducing the path of conduction heat and improving the energy efficiency and heat insulation effect of the overall window.
[0029] 2. The cross arm supports the support arm and the main force arm, improving the carrying capacity of the support arm and the main force arm. The design thickness of the window sash heat insulation strip, the window frame heat insulation strip, the outer sash frame, the inner sash frame, the outer window frame and the inner window frame can be increased. The support arm and the main force arm can be appropriately increased. When the outer sash frame and the inner sash frame are opened, the outer sash frame and the inner sash frame can be moved to a position farther away from the outer window frame and the inner window frame, thereby further avoiding interference. Therefore, by increasing the overall thickness to improve the heat insulation effect, the thickened glass window can also be normally opened and closed under long-term use. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.
[0031] Figure 2 is a schematic diagram of the structure of the sliding block, the main force arm, the support arm and the cross arm of the embodiment of the present application.
[0032] Marked: 1, outer window frame; 11, outer main frame; 12, outer secondary frame; 2, inner window frame; 21, inner main frame; 22, inner secondary frame; 31, outer sash frame; 32, inner sash frame; 4, hollow glass; 5, window frame heat insulation strip; 51, main frame heat insulation strip; 511, second clamping groove; 512, second clamping block; 52, secondary frame heat insulation strip; 521, third clamping groove; 522, third clamping block; 6, window sash heat insulation strip; 61, first clamping groove; 62, first clamping block; 7, heat insulation protection plate; 81, waterproof strip; 82, anti-collision strip; 91, sliding rail; 92, sliding block; 93, support arm; 94, main force arm; 95, cross arm; 96, window sash mounting strip. DETAILED DESCRIPTION
[0033] The application will be further described below in conjunction with the accompanying drawings. Figures 1-2 The application will be further described below in conjunction with the accompanying drawings.
[0034] The application discloses a built-in hardware slot heat insulation out-opening glass window.
[0035] As Figure 1 The built-in hardware slot heat insulation out-opening glass window comprises an outer window frame 1, an inner window frame 2, an outer sash frame 31 and an inner sash frame 32, the outer window frame 1 and the inner window frame 2 are connected through a window frame heat insulation strip 5, and the outer sash frame 31 and the inner sash frame 32 are connected through a window sash heat insulation strip 6.
[0036] The outer window frame 1 comprises an outer main frame 11 and an outer auxiliary frame 12, the inner window frame 2 comprises an inner main frame 21 and an inner auxiliary frame 22, and the window frame heat insulation strip 5 comprises a main frame heat insulation strip 51 and an auxiliary frame heat insulation strip 52.
[0037] The opposite sides of the inner main frame 21 and the outer main frame 11 are both provided with two second clamping grooves 511 along the height directions of the inner main frame 21 and the outer main frame 11 respectively, the second clamping grooves 511 of the inner main frame 21 penetrate through the top and the bottom of the inner main frame 21, the second clamping grooves 511 of the outer main frame 11 penetrate through the top and the bottom of the outer main frame 11, the second clamping grooves 511 of the inner main frame 21 correspond to the second clamping grooves 511 of the outer main frame 11 one by one, the number of the main frame heat insulation strips 51 is two, the two sides of each main frame heat insulation strip 51 are provided with a second clamping block 512, the second clamping block 512 is arranged along the height direction of the main frame heat insulation strip 51, the second clamping block 512 is flush with the top and the bottom of the main frame heat insulation strip 51, the width of each main frame heat insulation strip 51 is 49 mm, and the total width of the inner main frame 21, the main frame heat insulation strip 51 and the outer main frame 11 is 116 mm.
[0038] The opposite sides of the inner auxiliary frame 22 and the outer auxiliary frame 12 are both provided with a third clamping groove 521 along the height directions of the inner auxiliary frame 22 and the outer auxiliary frame 12 respectively, the third clamping groove 521 of the inner auxiliary frame 22 penetrates through the top and the bottom of the inner auxiliary frame 22, the third clamping groove 521 of the outer auxiliary frame 12 penetrates through the top and the bottom of the outer auxiliary frame 12, the third clamping groove 521 of the inner auxiliary frame 22 corresponds to the third clamping groove 521 of the outer auxiliary frame 12 one by one, the number of the auxiliary frame heat insulation strip 52 is one, the two sides of the auxiliary frame heat insulation strip 52 are provided with a third clamping block 522, the third clamping block 522 is arranged along the height direction of the auxiliary frame heat insulation strip 52, the third clamping block 522 is flush with the top and the bottom of the auxiliary frame heat insulation strip 52, the width of each auxiliary frame heat insulation strip 52 is 39 mm, and the total width of the inner auxiliary frame 22, the auxiliary frame heat insulation strip 52 and the outer auxiliary frame 12 is 110 mm. The inner auxiliary frame 22 is connected with the inner main frame 21, the outer main frame 11 is connected with the outer auxiliary frame 12, the opposite sides of the outer auxiliary frame 12 and the inner auxiliary frame 22 are commonly provided with a heat insulation protection plate 7, the auxiliary frame heat insulation strip 52 is located between the heat insulation protection plate 7 and the main frame heat insulation strip 51, the heat insulation protection plate 7 covers the auxiliary frame heat insulation strip 52, and the heat insulation protection plate 7 is also connected with the outer auxiliary frame 12 and the inner auxiliary frame 22 in a plug-in mode.
[0039] The opposite sides of the inner sash frame 32 and the outer sash frame 31 are provided with two first clamping grooves 61 along the height direction of the sash frame, the first clamping grooves 61 of the inner sash frame 32 penetrate to the top and bottom of the inner sash frame 32, the first clamping grooves 61 of the outer sash frame 31 penetrate to the top and bottom of the outer sash frame 31, the first clamping grooves 61 of the inner sash frame 32 correspond to the first clamping grooves 61 of the outer sash frame 31 one by one, the number of the sash heat insulation strips 6 is one, the sash heat insulation strip 6 is provided with a first clamping block 62 on both sides, the first clamping block 62 is arranged along the height direction of the sash heat insulation strip 6, the first clamping block 62 is flush with the top and bottom of the sash heat insulation strip 6, the width of each sash heat insulation strip 6 is 34mm, and the total width of the outer sash frame 31, the sash heat insulation strip 6 and the inner sash frame 32 is 75mm.
[0040] The first clamping groove 61, the second clamping groove 511 and the third clamping groove 521 are dovetail grooves, and the first clamping block 62, the second clamping block 512 and the third clamping block 522 are dovetail blocks.
[0041] The sash heat insulation strip 6 of the outer sash frame 31 close to the heat insulation protection plate 7 on the side facing the outer secondary frame 12 is provided with a waterproof strip 81, the waterproof strip 81 has the same height as the outer sash frame 31 and the sash heat insulation strip 6, when the outer sash frame 31 and the inner sash frame 32 are closed, the waterproof strip 81 on the outer sash frame 31 abuts against the outer secondary frame 12, and the waterproof strip 81 of the sash heat insulation strip 6 abuts against the heat insulation protection plate 7. The side of the inner sash frame 32 facing the indoor is provided with an anti-collision strip 82, and when the outer sash frame 31 and the inner sash frame 32 are closed, the anti-collision strip 82 abuts against the inner secondary frame 22.
[0042] The inner sash frame 32 and the outer sash frame 31 are jointly provided with three layers of hollow glass 4, the thickness of each layer of hollow glass 4 is 5mm, and the gap between adjacent hollow glass 4 is 11mm.
[0043] As shown in Figure 1 and Figure 2 , the inner bottom wall of the inner sash frame 32 is provided with a sliding rail 91 along the length direction of the inner sash frame 32, two sliding blocks 92 are slidably connected to the sliding rail 91, one end of the sliding rail 91 is hingedly connected with a supporting arm 93, the two sliding blocks 92 are respectively hingedly connected with a main force arm 94 and a cross arm 95, the ends of the main force arm 94 and the supporting arm 93 away from the sliding rail 91 are jointly hingedly connected with a sash mounting strip 96, the cross arm 95 is hingedly connected with the main force arm 94 and the supporting arm 93, the sash mounting strip 96 is parallel to the cross arm 95, the main force arm 94 is parallel to the supporting arm 93, and the cross arm 95 supports the main force arm 94 and the supporting arm 93.
[0044] The principle of the embodiment of the present application is that the outer sash frame 31 and the inner sash frame 32 are connected only through the window sash heat insulation strip 6, the outer window frame 1 and the inner window frame 2 are connected only through the window frame heat insulation strip 5, heat can only be transferred through the heat insulation strip, the direct contact between the outer window frame 1 and the inner window frame 2 and the outer sash frame 31 and the inner sash frame 32 is interrupted, the heat transfer between the outer window and the inner window mainly depends on the material properties of the heat insulation strip, the path of the conduction heat is reduced, and the energy efficiency and the heat insulation effect of the whole window are improved.
[0045] The cross arm 95 supports the support arm 93 and the main force arm 94, improves the bearing capacity of the support arm 93 and the main force arm 94, and the design thickness of the window sash heat insulation strip 6, the window frame heat insulation strip 5, the outer sash frame 31, the inner sash frame 32, the outer window frame 1 and the inner window frame 2 can be increased, the support arm 93 and the main force arm 94 can be appropriately increased, when the outer sash frame 31 and the inner sash frame 32 are opened, the outer sash frame 31 and the inner sash frame 32 can be moved to a position farther away from the outer window frame 1 and the inner window frame 2, thereby further avoiding the interference, so that the heat insulation effect is improved by increasing the overall thickness, and the thickened glass window can be normally opened and closed under long-term use.
[0046] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A heat-insulating outward-opening glass window with built-in hardware slots, characterized by: The invention comprises an outer window frame (1), an inner window frame (2), an outer sash frame (31) and an inner sash frame (32), wherein the outer window frame (1) and the inner window frame (2) are connected via a window frame heat insulation strip (5), and the outer sash frame (31) and the inner sash frame (32) are connected via a window sash heat insulation strip (6). One side of the inner window frame (2) is rotatably connected to a support arm (93), and the inner window frame (2) is rotatably and slidably connected to a main force-bearing arm (94) and a cross arm (95), wherein the main force-bearing arm (94) and the support arm (93) are hinged together with a window sash mounting strip (96) at one end away from the inner window frame (2), the cross arm (95) is hinged with the main load-bearing arm (94) and the support arm (93), the window sash mounting strip (96) and the cross arm (95) are parallel to each other, the main load-bearing arm (94) and the support arm (93) are parallel to each other, and the cross arm (95) supports the main load-bearing arm (94) and the support arm (93).
2. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 1, characterized in that: The inner window frame (2) is provided with a slide rail (91), the main force-bearing arm (94) and the cross arm (95) are both hinged with a slider (92), and the slider (92) is slidably connected to the slide rail (91).
3. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 1, characterized in that: The outer window frame (1) comprises an outer main frame (11) and an outer sub-frame (12); the inner window frame (2) comprises an inner main frame (21) and an inner sub-frame (22); and the window frame heat insulation strip (5) comprises a main frame heat insulation strip (51) and a sub-frame heat insulation strip (52); The inner main frame (21) is connected to the outer main frame (11) via a main frame heat insulation strip (51), the outer sub-frame (12) and the inner sub-frame (22) are connected via a sub-frame heat insulation strip (52), the outer main frame (11) is connected to the outer sub-frame (12), and the inner main frame (21) is connected to the inner sub-frame (22).
4. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 3, characterized in that: The outer sash frame (31) and the inner sash frame (32) are both provided with first snap-fitting grooves (61) along their respective height directions on opposite sides, and first snap-fitting blocks (62) are provided on both sides of the window sash heat insulation strip (6), and the first snap-fitting blocks (62) are snap-fitted into the first snap-fitting grooves (61) on the same side; A second snap-in groove (511) is provided on one side of the outer main frame (11) and the inner main frame (21) opposite to each other along their respective height directions, and a second snap-in block (512) is provided on both sides of the main frame heat-insulating strip (51), and the second snap-in block (512) is snapped into the second snap-in groove (511) on the same side; A third snap-in groove (521) is provided on opposite sides of the outer sub-frame (12) and the inner sub-frame (22) along their respective height directions, and third snap-in blocks (522) are provided on both sides of the sub-frame heat insulation strip (52), and the third snap-in blocks (522) are snap-fitted into the third snap-in groove (521) on the same side.
5. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 4, characterized in that: The first clamping block (62), the second clamping block (512) and the third clamping block (522) are all dovetail blocks, and the first clamping slot (61), the second clamping slot (511) and the third clamping slot (521) are all dovetail slots.
6. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 3, characterized in that: A heat insulation protection plate (7) is provided on one side of the outer sub-frame (12) and the inner sub-frame (22) facing each other; the sub-frame heat insulation strip (52) is located between the heat insulation protection plate (7) and the main frame heat insulation strip (51); and the heat insulation protection plate (7) covers the sub-frame heat insulation strip (52).
7. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 6, characterized in that: The outer fan frame (31) and the window fan heat insulation strip (6) are both provided with a waterproof strip (81). When the outer fan frame (31) and the inner fan frame (32) are closed, the waterproof strip (81) on the outer fan frame (31) abuts against the outer sub-frame (12), and the waterproof strip (81) of the window fan heat insulation strip (6) abuts against the heat insulation protective plate (7).
8. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 3, characterized in that: An anti-collision strip (82) is installed on the side of the inner fan frame (32) facing the interior of the room. When the outer fan frame (31) and the inner fan frame (32) are closed, the anti-collision strip (82) abuts against the inner sub-frame (22).
9. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 3, characterized in that: The thickness of the main frame heat insulation strip (51) is greater than 45 mm, and the total thickness of the outer main frame (11), the inner main frame (21) and the main frame heat insulation strip (51) is greater than 110 mm; The thickness of the sub-frame heat insulation strip (52) is greater than 35 mm, and the total thickness of the outer sub-frame (12), the inner sub-frame (22) and the sub-frame heat insulation strip (52) is greater than 105 mm; The thickness of the window sash heat insulation strip (6) is greater than 30 mm, and the total thickness of the outer sash frame (31), the inner sash frame (32) and the window sash heat insulation strip (6) is greater than 75 mm.
10. The heat-insulating outward-opening glass window with built-in hardware slots according to claim 1, characterized in that: The inner sash frame (32) and the outer sash frame (31) are jointly provided with at least three layers of insulating glass (4), and the gap between each layer of insulating glass (4) is greater than 10 mm.