SJKM60 series heat-insulation outward casement window system

Abstract

The invention discloses an SJKM60 series heat-insulation out-swinging casement window system which comprises a first window frame and a second reinforcing middle frame, and the first window frame is tightly attached to a first conversion frame; the inner and outer cavities for connecting the first window sash and the second window sash are designed to be high bottom positions, so that the width of the heat insulation strip is not changed, the width of the first pressing line, the width of the second pressing line and the width of the mounting notches are not reduced, the sash width is reduced, meanwhile, the width of the window frame is reduced along with the reduction of the window sash width, the material consumption is reduced, and the cost is reduced. The production cost can be saved; the connecting part of the first conversion frame and the first window frame is designed to be a frame-wrapping small edge, so that a connecting gap can be shielded, and meanwhile, the sealing performance can be improved; and the local wall thickness of the second reinforcement middle part is specially increased, and the material resistance strength is improved through the two aspects of the material attribute and the cross-sectional inertia distance, so that a steel sleeving method is replaced, the material cost and the labor cost can be reduced, the overall stress can be better improved, and contact corrosion of different materials is also avoided.

Description

Technical Field

[0001] This invention relates to the field of window opening system technology, and in particular to an SJKM60 series thermally insulated outward casement window system. Background Technology

[0002] Doors and windows are an important component of building envelopes. Design requirements include wind pressure resistance, water tightness, air tightness, thermal insulation, sound insulation, and heat insulation. Performance requirements vary depending on the project. Over the years, user requirements for the environment have changed, as have their demands for the performance and appearance of doors and windows. Previously, aluminum alloy insulated casement windows used laminated double-glazed glass, with a minimum frame thickness of 65mm. Transition frames were typically flush with the window frame without edging. In the first reinforcement stage, internal steel sleeves were used when the load-bearing capacity was insufficient. This technical solution had significant drawbacks: Firstly, with the development of… Thicker glass requires wider window sashes to ensure that the thermal break strips of equal width are used and that the width of the third pressure groove on the sash does not become too small. If the pressure groove is too narrow, the pressure feet will be too narrow, and the glass will not be properly secured. However, widening the window sash also requires widening the window frame, increasing material costs. Secondly, the lack of edging at the connection between the transition frame and the window frame makes it prone to gaps and poor sealing. Finally, the steel sleeve in the inner cavity of the first reinforcement can lead to corrosion at the joints of different materials or large contact gaps that fail to provide actual load-bearing capacity. Therefore, designing an SJKM60 series thermally insulated outward-opening window system is essential. Summary of the Invention

[0003] The purpose of this invention is to provide an SJKM60 series thermally insulated outward-opening window system to solve the defects of existing technical solutions, such as increased material costs, lack of edge binding at the connection between the conversion frame and the window frame leading to poor sealing due to gaps, and the steel sleeve in the inner cavity of the first reinforcement causing easy corrosion or large contact gaps that fail to provide actual load-bearing function.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an SJKM60 series thermally insulated outward-opening window system, comprising a first window frame, a first set of corner brackets, self-tapping screws, a first reinforcing bracket and a second reinforcing bracket, wherein the first window frame is closely attached to a first transition frame, the first transition frame is overlapped with a fourth EPDM rubber strip, the fourth EPDM rubber strip is overlapped with a first window sash, the first window sash is fixedly connected to a first pressure line, the first pressure line is fixedly connected to a first EPDM rubber strip, the first EPDM rubber strip is fixedly connected to a first laminated insulated glass, the first laminated insulated glass is fixedly connected to a second EPDM rubber strip, the second EPDM rubber strip is fixedly connected to a second window sash, the second window sash is fixedly connected to a third EPDM rubber strip, the third EPDM rubber strip is fixedly connected to a third transition frame, and the third transition frame is fixedly connected to the second window frame.

[0005] As a further technical solution of the present invention, a third set of corner brackets is provided inside the first window frame, a fifth set of corner brackets is provided inside the first conversion frame, the first conversion frame is fixedly connected to the first window frame by self-tapping screws, and a fourth set of corner pieces is provided on the first conversion frame.

[0006] As a further technical solution of the present invention, a first silicone sealant is provided at the connection between the first laminated insulating glass and the second window sash. The first silicone sealant is closely attached to the second EPDM rubber strip, which further enhances the sealing performance at this point and effectively prevents rainwater, dust and other substances from entering the room.

[0007] As a further technical solution of the present invention, the second window sash is fixedly connected with a first set of corner pieces, a third set of corner pieces and a first set of corner brackets, and the second window sash is fixedly connected with a fifth thermal insulation strip and a sixth thermal insulation strip, which are fixedly connected to the first window sash. The first window sash is provided with a sixth set of corner brackets. These components work together to enhance the connection stability and sealing between the window frame and the window sash.

[0008] As a further technical solution of the present invention, the second window frame is fixedly connected with a first thermal insulation strip and a second thermal insulation strip, the first thermal insulation strip and the second thermal insulation strip are fixedly connected to the first window frame, a second set of corner brackets are provided on the second window frame, a second set of corner pieces are provided on the second window frame, a fourth set of corner brackets are provided on the third conversion frame, a third thermal insulation strip and a fourth thermal insulation strip are fixedly connected to the third conversion frame, the third thermal insulation strip and the fourth thermal insulation strip are fixedly connected to the first conversion frame, a fifth EPDM rubber strip is fixedly connected to the fourth thermal insulation strip, and the fifth EPDM rubber strip is fixedly connected to the fifth thermal insulation strip, further improving the stability of the entire window frame structure.

[0009] As a further technical solution of the present invention, the first reinforcing member is fixedly connected to the second conversion frame by screws. The first reinforcing member is fixedly connected to a third pressure line. The third pressure line is fixedly connected to a sixth EPDM rubber strip. The sixth EPDM rubber strip is fixedly connected to a third laminated insulating glass unit. The third laminated insulating glass unit is fixedly connected to a seventh EPDM rubber strip and a third silicone sealant. The seventh EPDM rubber strip and the third silicone sealant are fixedly connected to the second reinforcing member. The second reinforcing member is fixedly connected to a fourth conversion frame. The frame is connected by an eighth EPDM rubber strip, which in turn connects to the fourth window sash. The fourth window sash is fixedly connected to a thirteenth EPDM rubber strip, which in turn connects to the second laminated insulated glass unit. The second laminated insulated glass unit is fixedly connected to an eleventh EPDM rubber strip, which in turn connects to a second pressure line. The second pressure line is secured to the third window sash, which is connected to a twelfth EPDM rubber strip. The twelfth EPDM rubber strip is connected to the second transition frame, and a fifth transition frame is installed on the second transition frame.

[0010] As a further technical solution of the present invention, a second silicone sealant is provided at the connection between the fourth window sash and the second laminated insulated glass; an eighth set of corner brackets is provided inside the fourth transition frame; a seventh set of corner brackets is provided inside the fifth transition frame; a ninth and tenth thermal insulation strips are fixedly connected to the fourth transition frame; the ninth and tenth thermal insulation strips are fixedly connected to the fifth transition frame; a seventh and eighth thermal insulation strips are fixedly connected to the second reinforcing core; a first reinforcing core is fixedly connected to the seventh and eighth thermal insulation strips; a fifth and sixth set of corner pieces are respectively provided on the fourth window sash; a ninth set of corner brackets is provided inside the fourth window sash; an eleventh and twelfth thermal insulation strips are fixedly connected to the fourth window sash; the eleventh and twelfth thermal insulation strips are fixedly connected to the third window sash; a tenth set of corner brackets is provided on the third window sash; a ninth EPDM rubber strip is fixedly connected to the eleventh thermal insulation strip; and a tenth thermal insulation strip is fixedly connected to the ninth EPDM rubber strip.

[0011] The SJKM60 series thermally insulated outward-opening casement window system provided by this invention has the following advantages: By designing the inner and outer cavities connecting the first and second window sashes with a high-low configuration, the width of the thermal insulation strip remains unchanged, and the width of the first and second pressure lines and their installation grooves does not decrease, thus reducing the sash width. At the same time, the window frame width also decreases with the reduction in sash width, reducing material usage and saving production costs. The connection between the first transition frame and the first window frame is designed with a small frame-enclosing edge, which not only conceals the connection gap but also improves the sealing performance. The local wall thickness of the second reinforcing core is specially thickened, improving the material's resistance strength through both material properties and cross-sectional moment of inertia, thereby replacing the steel casing method. This reduces material and labor costs, improves overall stress, and avoids contact corrosion between different materials. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall horizontal sectional view of the present invention; Figure 3 This is an overall vertical sectional view of the present invention.

[0014] In the diagram: 1. First window frame; 2. First transition frame; 3. First window sash; 4. First pressure line; 5. First laminated insulated glass; 6. First silicone sealant; 7. Second window sash; 8. First set of corner brackets; 9. First set of corner brackets; 10. Second window frame; 11. Second set of corner brackets; 12. Third set of corner brackets; 13. Self-tapping screw; 14. First EPDM rubber strip; 15. Second EPDM rubber strip; 16. Third EPDM rubber strip; 17. First reinforcement... 18. Second laminated insulated glass; 19. Second silicone sealant; 20. Second reinforced insulated glass; 21. Third laminated insulated glass; 22. Third pressure line; 23. Second transition frame; 24. Third window sash; 25. Second pressure line; 26. Fourth window sash; 27. First thermal break strip; 28. Fourth set of corner brackets; 29. ​​Second set of corner pieces; 30. Third set of corner pieces; 31. Second thermal break strip; 32. Fifth set of corner brackets; 33. Third thermal break strip 34. Fourth thermal insulation strip; 35. Third transition frame; 36. Fourth set of corner pieces; 37. Fourth EPDM rubber strip; 38. Fifth EPDM rubber strip; 39. Sixth set of corner brackets; 40. Fifth thermal insulation strip; 41. Sixth thermal insulation strip; 42. Sixth EPDM rubber strip; 43. Third silicone sealant; 44. Seventh EPDM rubber strip; 45. Seventh thermal insulation strip; 46. Eighth thermal insulation strip; 47. Ninth thermal insulation strip; 48. Tenth thermal insulation strip; 49. 50. Fourth transition frame; 51. Seventh corner bracket; 52. Fifth transition frame; 53. Eighth corner bracket; 54. Eighth EPDM rubber strip; 55. Fifth corner piece; 56. Ninth EPDM rubber strip; 57. Eleventh thermal insulation strip; 58. Ninth corner bracket; 59. Sixth corner piece; 60. Thirteenth EPDM rubber strip; 61. Eleventh EPDM rubber strip; 62. Tenth corner bracket; 63. Twelfth thermal insulation strip; 64. Twelfth EPDM rubber strip. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see the appendix Figure 1 -Appendix Figure 3An embodiment of the present invention provides an SJKM60 series thermally insulated outward-opening window system, comprising a first window frame 1, a first set of corner brackets 8, self-tapping screws 13, a first reinforcing bracket 17, and a second reinforcing bracket 20. The first window frame 1 is closely attached to a first transition frame 2. The first transition frame 2 is overlapped with a fourth EPDM rubber strip 37. The fourth EPDM rubber strip 37 overlaps with a first window sash 3. The first window sash 3 is fixedly connected to a first pressure line 4. A first EPDM rubber strip 14 is fixedly connected to the first pressure line 4. The first EPDM rubber strip 14 is fixedly connected to a first laminated insulated glass 5. A first EPDM rubber strip 14 is fixedly connected to the first laminated insulated glass 5. The second EPDM rubber strip 15 is fixedly connected to the second window sash 7. A third EPDM rubber strip 16 is fixedly connected to the second window sash 7. A third transition frame 35 is fixedly connected to the third EPDM rubber strip 16, and the third transition frame 35 is fixedly connected to the second window frame 10. A third set of corner brackets 12 is provided inside the first window frame 1, and a fifth set of corner brackets 32 is provided inside the first transition frame 2. The first transition frame 2 is fixedly connected to the first window frame 1 by self-tapping screws 13, and a fourth set of corner pieces 36 is provided on the first transition frame 2. A first silicone sealant 6 is provided at the connection between the first laminated insulated glass 5 and the second window sash 7. The first silicone sealant 6 is tightly attached to the second EPDM rubber strip 15, further enhancing the sealing performance and effectively preventing rainwater and dust from entering the room. The second window sash 7 is fixedly connected to the first set of corner pieces 8, the third set of corner pieces 30, and the first set of corner brackets 9. The second window sash 7 is also fixedly connected to the fifth thermal insulation strip 40 and the sixth thermal insulation strip 41. The fifth thermal insulation strip 40 and the sixth thermal insulation strip 41 are fixedly connected to the first window sash 3. The first window sash 3 is equipped with the sixth set of corner brackets 39. These components work together to enhance the connection stability and sealing between the window frame and the window sash. The second window frame 10 is fixedly connected to the first thermal insulation strip 27 and the... Two thermal insulation strips 31, a first thermal insulation strip 27 and a second thermal insulation strip 31 are fixedly connected to the first window frame 1, a second set of corner brackets 11 are provided on the second window frame 10, a second set of corner pieces 29 are provided on the second window frame 10, a fourth set of corner brackets 28 are provided on the third transition frame 35, a third thermal insulation strip 33 and a fourth thermal insulation strip 34 are fixedly connected to the third transition frame 35, the third thermal insulation strip 33 and the fourth thermal insulation strip 34 are fixedly connected to the first transition frame 2, a fifth EPDM rubber strip 38 is fixedly connected to the fourth thermal insulation strip 34, and a fifth thermal insulation strip 40 is fixedly connected to the fifth EPDM rubber strip 38, which further improves the stability of the entire window frame structure;The first reinforcing core 17 is fixedly connected to the second transition frame 23 by screws. The first reinforcing core 17 is fixedly connected to the third pressure line 22. The third pressure line 22 is fixedly connected to the sixth EPDM rubber strip 42. The sixth EPDM rubber strip 42 is fixedly connected to the third laminated insulating glass 21. The third laminated insulating glass 21 is fixedly connected to the seventh EPDM rubber strip 44 and the third silicone sealant 43. The seventh EPDM rubber strip 44 and the third silicone sealant 43 are fixedly connected to the second reinforcing core 20. The second reinforcing core 20 is fixedly connected to the fourth transition frame 49. The fourth transition frame... 49 is connected to the eighth EPDM rubber strip 53, the eighth EPDM rubber strip 53 is connected to the fourth window sash 26, the fourth window sash 26 is fixedly connected to the thirteenth EPDM rubber strip 59, the thirteenth EPDM rubber strip 59 is fixedly connected to the second laminated insulated glass 18, the second laminated insulated glass 18 is fixedly connected to the eleventh EPDM rubber strip 60, the eleventh EPDM rubber strip 60 is fixedly connected to the second pressure line 25, the second pressure line 25 is clipped to the third window sash 24, the third window sash 24 is connected to the twelfth EPDM rubber strip 63, the twelfth EPDM rubber strip 63 is connected to the second transition frame 2 3. A fifth transition frame 51 is provided on the second transition frame 23; a second silicone sealant 19 is provided at the connection between the fourth window sash 26 and the second laminated insulated glass 18; an eighth set of corner brackets 52 is provided inside the fourth transition frame 49; a seventh set of corner brackets 50 is provided inside the fifth transition frame 51; a ninth thermal insulation strip 47 and a tenth thermal insulation strip 48 are fixedly connected to the fourth transition frame 49; the ninth thermal insulation strip 47 and the tenth thermal insulation strip 48 are fixedly connected to the fifth transition frame 51; a seventh thermal insulation strip 45 and an eighth thermal insulation strip 46 are fixedly connected to the second reinforcing core 20; the seventh thermal insulation strip 45 and the... The fourth window sash 26 is fixedly connected to the first reinforcing strip 17. The fifth set of corner brackets 54 and the sixth set of corner brackets 58 are respectively installed on the fourth window sash 26. The ninth set of corner brackets 57 is installed inside the fourth window sash 26. The fourth window sash 26 is fixedly connected to the eleventh thermal insulation strip 56 and the twelfth thermal insulation strip 62. The eleventh thermal insulation strip 56 and the twelfth thermal insulation strip 62 are fixedly connected to the third window sash 24. The third window sash 24 is equipped with the tenth set of corner brackets 61. The eleventh thermal insulation strip 56 is fixedly connected to the ninth EPDM rubber strip 55. The ninth EPDM rubber strip 55 is fixedly connected to the tenth thermal insulation strip 48.

[0017] Specifically, in use, the inner and outer cavities connecting the first window sash 3 and the second window sash 24 are designed with a high-low position. This ensures that the width of the thermal insulation strip remains unchanged, and the width of the first pressure line 4 and the second pressure line 25 and their installation grooves do not decrease, thus reducing the sash width. At the same time, the window frame width also decreases with the reduction in sash width, which can reduce the number of applications, reduce material usage, and help save production costs. The connection between the first conversion frame 2 and the first window frame 1 is designed with a small frame edge, which can both cover the connection gap and improve the sealing performance. The first reinforcing core 17 is designed with T6 grade aluminum, and the local wall thickness of the second reinforcing core 20 is specially thickened. By improving the material resistance strength through both material properties and cross-sectional moment of inertia, the steel sleeve method is replaced, which can reduce material and labor costs, improve the overall stress, and avoid contact corrosion between different materials. Rubber strips are used to connect the various nodes, and the first silicone sealant 6 is used for special sealing between the components connected to the first laminated insulated glass 5, which can greatly improve the sealing performance.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An SJKM60 series thermally insulated outward-opening casement window system, comprising a first window frame (1), a first set of corner brackets (8), self-tapping screws (13), a first reinforcing bracket (17), and a second reinforcing bracket (20), characterized in that: The first window frame (1) is closely attached to the first transition frame (2). The first transition frame (2) is connected to a fourth EPDM rubber strip (37). The fourth EPDM rubber strip (37) is connected to the first window sash (3). The first window sash (3) is fixedly connected to a first pressure line (4). The first pressure line (4) is fixedly connected to a first EPDM rubber strip (14). The first EPDM rubber strip (14) is fixedly connected to the first laminated insulated glass (5). The first laminated insulated glass (5) is fixedly connected to a second EPDM rubber strip (15). The second EPDM rubber strip (15) is fixedly connected to a second window sash (7). The second window sash (7) is fixedly connected to a third EPDM rubber strip (16). The third EPDM rubber strip (16) is fixedly connected to a third transition frame (35). The third transition frame (35) is fixedly connected to a second window frame (10).

2. The SJKM60 series thermally insulated outward-opening casement window system according to claim 1, characterized in that: The first window frame (1) is provided with a third set of corner brackets (12), the first conversion frame (2) is provided with a fifth set of corner brackets (32), the first conversion frame (2) is fixedly connected to the first window frame (1) by self-tapping screws (13), and the first conversion frame (2) is provided with a fourth set of corner pieces (36).

3. The SJKM60 series thermally insulated outward-opening casement window system according to claim 1, characterized in that: A first silicone sealant (6) is provided at the connection between the first laminated insulating glass (5) and the second window sash (7), and the first silicone sealant (6) is closely attached to the second EPDM rubber strip (15).

4. The SJKM60 series thermally insulated outward-opening casement window system according to claim 3, characterized in that: The second window sash (7) is fixedly connected with a first set of corner pieces (8), a third set of corner pieces (30) and a first set of corner brackets (9). The second window sash (7) is fixedly connected with a fifth thermal insulation strip (40) and a sixth thermal insulation strip (41). The fifth thermal insulation strip (40) and the sixth thermal insulation strip (41) are fixedly connected to the first window sash (3). The first window sash (3) is provided with a sixth set of corner brackets (39).

5. The SJKM60 series thermally insulated outward-opening casement window system according to claim 1, characterized in that: The second window frame (10) is fixedly connected with the first thermal insulation strip (27) and the second thermal insulation strip (31). The first thermal insulation strip (27) and the second thermal insulation strip (31) are fixedly connected to the first window frame (1). The second window frame (10) is provided with the second set of corner brackets (11) and the second window frame (10) is provided with the second set of corner pieces (29). The third conversion frame (35) is provided with the fourth set of corner brackets (28). The third conversion frame (35) is fixedly connected with the third thermal insulation strip (33) and the fourth thermal insulation strip (34). The third thermal insulation strip (33) and the fourth thermal insulation strip (34) are fixedly connected to the first conversion frame (2). The fourth thermal insulation strip (34) is fixedly connected with the fifth EPDM rubber strip (38). The fifth EPDM rubber strip (38) is fixedly connected with the fifth thermal insulation strip (40).

6. The SJKM60 series thermally insulated outward-opening casement window system according to claim 1, characterized in that: The first reinforcing intermediate (17) is fixedly connected to the second conversion frame (23) by screws. The first reinforcing intermediate (17) is fixedly connected to the third pressure line (22). The third pressure line (22) is fixedly connected to the sixth EPDM rubber strip (42). The sixth EPDM rubber strip (42) is fixedly connected to the third laminated insulating glass (21). The third laminated insulating glass (21) is fixedly connected to the seventh EPDM rubber strip (44) and the third silicone sealant (43). The seventh EPDM rubber strip (44) and the third silicone sealant (43) are fixedly connected to the second reinforcing intermediate (20). The second reinforcing intermediate (20) is fixedly connected to the fourth conversion frame (49). The fourth conversion frame (49) overlaps with the eighth EPDM rubber strip. The fourth window sash (26) is connected to the eighth EPDM strip (53). The fourth window sash (26) is fixedly connected to the thirteenth EPDM strip (59). The thirteenth EPDM strip (59) is fixedly connected to the second laminated insulated glass (18). The second laminated insulated glass (18) is fixedly connected to the eleventh EPDM strip (60). The eleventh EPDM strip (60) is fixedly connected to the second pressure line (25). The second pressure line (25) is snapped to the third window sash (24). The twelfth EPDM strip (63) is connected to the third window sash (24). The twelfth EPDM strip (63) is connected to the second transition frame (23). The fifth transition frame (51) is provided on the second transition frame (23).

7. The SJKM60 series thermally insulated outward-opening casement window system according to claim 6, characterized in that: A second silicone sealant (19) is provided at the connection between the fourth window sash (26) and the second laminated insulated glass (18). An eighth set of corner brackets (52) is provided inside the fourth transition frame (49). A seventh set of corner brackets (50) is provided inside the fifth transition frame (51). A ninth thermal insulation strip (47) and a tenth thermal insulation strip (48) are fixedly connected to the fourth transition frame (49). The ninth thermal insulation strip (47) and the tenth thermal insulation strip (48) are fixedly connected to the fifth transition frame (51). A seventh thermal insulation strip (45) and an eighth thermal insulation strip (46) are fixedly connected to the second reinforcing sash (20). The seventh thermal insulation strip (45) and the eighth thermal insulation strip (46) are fixedly connected. There is a first reinforced middle section (17), the fourth window sash (26) is provided with a fifth set of corner pieces (54) and a sixth set of corner pieces (58), the fourth window sash (26) is provided with a ninth set of corner brackets (57), the fourth window sash (26) is fixedly connected with an eleventh thermal insulation strip (56) and a twelfth thermal insulation strip (62), the eleventh thermal insulation strip (56) and the twelfth thermal insulation strip (62) are fixedly connected with a third window sash (24), the third window sash (24) is provided with a tenth set of corner brackets (61), the eleventh thermal insulation strip (56) is fixedly connected with a ninth EPDM rubber strip (55), the ninth EPDM rubber strip (55) is fixedly connected with a tenth thermal insulation strip (48).

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