Ventilation window for curtain wall

By setting waterproof blinds on the outside of the thermally insulated frame and thermally insulated window sash of the curtain wall ventilation system, the problem of rainwater entering when opening the window sash in rainy days is solved, the insulation effect of ventilation and non-ventilation in rainy days is achieved, and the surface decoration function is provided .

CN111608533BActive Publication Date: 2025-02-14BEIJING MELOOK DOOR & WINDOWS COP +1
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Patent Information

Application Number
CN202010569501.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-06-20
Publication Date
2025-02-14
Estimated Expiration
2040-06-20

AI Technical Summary

Technical Problem

When the existing curtain wall ventilation system opens the window sash for ventilation on rainy days, rainwater is easy to enter the room, making it difficult to achieve ventilation needs on rainy days.

Method used

A ventilation window for curtain wall is designed, and waterproof blinds are provided on the outside of the thermally insulated frame and the thermally insulated window sash. The waterproof blinds include a sash frame and a first sash plate arranged on the sash, and the first sash plate faces the outdoor side. Lean down to prevent rain from entering.

Benefits of technology

It realizes the function of opening the window sash for ventilation on rainy days, and closes the insulated windows when ventilation is not required, reducing indoor and outdoor air heat exchange and achieving good thermal insulation effect. The waterproof blinds also provide the decorative effect on the outside of the curtain wall.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the field of curtain wall ventilation, and in particular to a ventilation window for curtain walls. A ventilation window for curtain walls includes a connection frame connected to a curtain wall column, an insulation frame installed on the connection frame, an openable and closable insulation window sash, and a waterproof shutter. The waterproof shutter is installed on the side of the insulation frame facing the outdoors. The waterproof shutter includes a sash frame and a first water-shedding plate arranged on the sash frame, and the first water-shedding plate is inclined downward toward the outdoors. Waterproof shutters are arranged on the outside of the insulation frame and the insulation window sash to prevent rain, so that the window sash can be opened for ventilation on rainy days. When ventilation is not needed, the insulation window is closed to reduce the heat exchange of indoor and outdoor air, thereby achieving a good insulation and heat preservation effect. At the same time, the waterproof shutter has a good decorative effect on the outer side of the curtain wall.
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Description

Technical Field

[0001] The present application relates to the field of curtain wall ventilation, and in particular to a ventilation window for a curtain wall. Background Art

[0002] At present, curtain wall ventilation usually involves setting openable and closable windows on the curtain wall, and opening the windows when needed to allow outside air to enter the room.

[0003] With respect to the above-mentioned related technical solutions, when a user wants to open the window sash for ventilation on a rainy day, rainwater will enter the room through the opening of the window sash. Summary of the invention

[0004] In order to meet the demand for opening windows for ventilation on rainy days, the present application provides a ventilation window for curtain walls.

[0005] The present application provides a curtain wall ventilation window, which adopts the following technical solution:

[0006] A ventilation window for a curtain wall comprises a connecting frame connected to a curtain wall column, an insulating frame installed on the connecting frame, an openable and closable insulating window sash, and a waterproof shutter, wherein the waterproof shutter is installed on a side of the insulating frame facing the outdoors, and the waterproof shutter comprises a sash frame and a first water-shedding plate arranged on the sash frame, wherein the first water-shedding plate is inclined downward toward the outdoors.

[0007] By adopting the above technical solution, waterproof shutters are arranged on the outside of the insulation frame and the insulation window sash to achieve rainproof effect, so that the window sash can be opened for ventilation even on rainy days. When ventilation is not needed, the insulation window is closed to reduce the heat exchange of indoor and outdoor air, achieving good heat insulation effect. At the same time, the waterproof shutters have a good decorative effect on the outer side of the curtain wall.

[0008] Preferably, the connecting frame includes a medium pressure plate, a first thermal insulation strip, a middle support member, a first connecting bolt, a first sealing strip, and a second sealing strip. The first sealing strip is arranged on the curtain wall column, and the second sealing strip is arranged on the side of the medium pressure plate facing the curtain wall column. The middle support member is located between the first sealing strip and the second sealing strip, and the thermal insulation frame is located between the first sealing strip and the second sealing strip. The first thermal insulation strip is located between the curtain wall column and the medium pressure plate, and the first connecting bolt passes through the medium pressure plate and is threadedly connected to the curtain wall column.

[0009] By adopting the above technical solution, the first connecting bolt passes through the middle pressure plate and is threadedly connected with the curtain wall column to tighten and fix the insulation frame, while the middle support member plays the role of supporting the middle pressure plate away from the insulation frame. The first sealing strip and the second sealing strip cooperate with the insulation frame to form a sealing surface to achieve the effect of heat insulation and sound insulation.

[0010] Preferably, the heat insulation frame comprises an inner half frame, an outer half frame and a second heat insulation strip connecting the inner half frame and the outer half frame.

[0011] By adopting the above technical solution, the inner half frame and the outer half frame are connected by the second insulation strip to form an insulation frame, so that the insulation frame has a good insulation effect, avoids rapid heat exchange between indoor and outdoor, and saves energy consumption during indoor heating or cooling.

[0012] Preferably, the connecting frame also includes an outer pressure plate, an outer support, a second connecting bolt, and a third sealing strip. The third sealing strip is arranged on the side of the outer pressure plate facing the middle pressure plate, the outer support is arranged between the third sealing strip and the middle pressure plate, the waterproof shutter is arranged between the inner third sealing strip and the middle pressure plate, the second connecting bolt passes through the outer pressure plate and is threadedly connected to the middle pressure plate, and the outer pressure plate is clamped with a buckle plate facing the outdoor side.

[0013] By adopting the above technical solution, the outer pressure plate and the middle pressure plate are connected by the second connecting bolt, so that the outer pressure plate and the middle pressure plate cooperate to press and fix the waterproof shutter, and the outer support member plays the effect of supporting the outer pressure plate away from the waterproof shutter. The third sealing strip is used to form a sealing surface between the outer pressure plate and the fan frame of the waterproof shutter. The gusset plate is covered on the outer pressure plate, the upper surface of the outdoor platform is flush with the upper surface of the gusset plate, and the gusset plate and the outdoor platform are sealed with glue. Water will not seep in from the gap between the outer pressure plate and the waterproof shutter.

[0014] Preferably, a screen window is provided between the outer pressure plate and the middle pressure plate, and the screen window is located on the side of the waterproof shutter facing the indoor room.

[0015] By adopting the above technical solution, the outer pressure plate and the middle pressure plate are used to cooperate and fix the screen window, and the screen window has the effect of preventing mosquitoes and dust.

[0016] Preferably, the waterproof shutter includes a fan frame and a shutter assembly arranged on the fan frame, the fan frame is formed by splicing two transverse profiles and two longitudinal profiles, the transverse profile and the longitudinal profile both include a supporting portion and a connecting portion connected to the side of the supporting portion near the edge position, the connecting portion is formed with a groove facing the middle position of the supporting portion, the bottom of the groove is formed with a slide groove with a width greater than the groove, the shutter assembly includes a bracket and blades detachably connected to the bracket, the bracket includes a plurality of support units, each support unit includes a connecting plate, a limiting piece formed on one side of the connecting plate near the upper end position, and a supporting piece formed on the same side of the connecting plate near the lower end position; the width of the connecting plate is smaller than the width of the slide groove and larger than the width of the groove, and the limiting piece, abutment plate and supporting piece are all formed with avoidance grooves on both sides near the connecting plate position.

[0017] By adopting the above technical solution, the support unit is set in the slide groove through the louver assembly. After being installed along the slide groove to the designed position, the support unit and the longitudinal profile can be fixed by bonding, riveting, etc. Then, the longitudinal profile and the transverse profile are spliced ​​to form a fan frame, and the fan frame is installed on the connecting frame. The blades are installed on the support unit through the cooperation of the connecting plate and the supporting member. At the same time, under the premise of forming a seal between the outer pressure plate and the waterproof shutter. The connection part of the lower transverse profile can prevent the water on the outdoor platform from flowing into the room.

[0018] Preferably, the limiting member includes a first transverse extension plate formed on the side of the connecting plate, a first lower extension plate and a second lower extension plate formed below the first transverse extension plate, and a spacing is left between the first lower extension plate and the second lower extension plate; the blade includes a vertical first water baffle, a first water-shedding plate formed at the lower end of the first water baffle and inclined downward away from the first water baffle, and a second water baffle formed at the lower end of the first water-shedding plate and extending downward; when the blade is located on the bracket, the upper end of the first water baffle is located between the first lower extension plate and the second lower extension plate, the supporting member is in contact with the first water-shedding plate, and the second lower extension plate is an arc-shaped plate protruding toward the connecting plate.

[0019] By adopting the above technical solution, the second transverse extension plate and the third transverse extension plate are arranged as the supporting member to support the blade, and the upper extension plate is connected to the third transverse extension plate and cooperates with the abutment strip.

[0020] Preferably, the supporting member comprises an upper extension plate extending upward, and a contact strip is formed on the lower side of the first water-shedding plate, and the contact strip contacts with a side of the upper extension plate facing the connecting plate.

[0021] By adopting the above technical solution, the upper extension plate and the abutment strip abut against each other so that the lower end of the blade and the supporting member will not slide away from the connecting plate to cause the blade to fall.

[0022] Preferably, the supporting member includes a second transverse extension plate inclined downwardly away from the connecting plate and a third transverse extension plate formed at the lower end of the second transverse extension plate and extending horizontally away from the connecting plate, and the upper extension plate is located at one end of the third transverse extension plate away from the second transverse extension plate.

[0023] By adopting the above technical solution, the second transverse extension plate and the third transverse extension plate are arranged as the supporting member to support the blade, and the upper extension plate is connected to the third transverse extension plate and cooperates with the abutment strip.

[0024] Preferably, a third lower extension plate is extended downwardly from the lower surface of the second transverse extension plate, and a second connecting block cooperating with the first connecting block is formed on the side of the third lower extension plate facing the connecting plate; a first connecting block is formed on the side of the upper edge of the connecting plate facing the limit member.

[0025] By adopting the above technical solution, when a plurality of support units are arranged on the fan frame, the first connection block and the second connection block can cooperate to assist in connection and positioning.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Waterproof shutters are installed on the outside of the insulation frame and the insulation window sash to prevent rain, so that the window sash can be opened for ventilation on rainy days; when ventilation is not needed, the insulation window is closed to reduce the heat exchange between indoor and outdoor air, achieving a good insulation effect. At the same time, the waterproof shutters have a good decorative effect on the outer side of the curtain wall.

[0028] 2. The first connecting bolt passes through the middle pressure plate and is threadedly connected to the curtain wall column to tighten and fix the insulation frame. The first sealing strip and the second sealing strip cooperate with the insulation frame to form a sealing surface to achieve the effect of heat insulation and sound insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional schematic diagram of a curtain wall ventilation window in an embodiment;

[0030] Figure 2 is a cross-sectional schematic diagram of the connection frame, the heat insulation frame, the screen window, and the waterproof shutter part of the embodiment;

[0031] Figure 3 is a schematic structural diagram of a waterproof shutter in an embodiment;

[0032] Figure 4 is a schematic diagram of the structure of the waterproof shutter in the embodiment after the upper half is cut off;

[0033] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0034] Figure 6 is a structural schematic diagram of a support unit in an embodiment;

[0035] Figure 7 is a schematic diagram of the structure of the blade in the embodiment;

[0036] Figure 8 is a schematic diagram of the structure when two support units are installed and spliced ​​in the embodiment;

[0037] Fig. 9 is a schematic diagram of the process of installing the blade on the support unit in the embodiment;

[0038] Fig.10 Schematic diagram of the structure of the blade after being installed on the support unit in the embodiment.

[0039] Description of the accompanying drawings: 1. curtain wall column; 2. connecting frame; 3. insulation frame; 4. insulation window sash; 5. screen window; 6. waterproof shutter; 7. middle pressure plate; 8. first insulation strip; 9. middle support member; 10. first connecting bolt; 11. first sealing strip; 12. second sealing strip; 13. inner half frame; 14. outer half frame; 15. second insulation strip; 16. outer pressure plate; 17. outer support member; 18. second connecting bolt; 19. buckle plate; 20. third sealing strip; 21. sash frame; 22. shutter assembly; 23. horizontal profile; 24. longitudinal profile; 25. support part; 26. connecting part; 27. Groove; 28, slide groove; 29, bracket; 30, blade; 31, support unit; 32, connecting plate; 33, abutment plate; 34, supporting member; 35, avoidance groove; 36, first connecting block; 37, first transverse extension plate; 38, first lower extension plate; 39, second lower extension plate; 40, second transverse extension plate; 41, third lower extension plate; 42, third transverse extension plate; 43, upper extension plate; 44, second connecting block; 45, first water retaining plate; 46, first water dripping plate; 47, second water dripping plate; 48, second water retaining plate; 49, reinforcing strip; 50, abutment strip; 51, limit member. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-10 This application is described in further detail.

[0041] The embodiment of the present application discloses a ventilation window for a curtain wall.

[0042] like Figure 1 As shown, the curtain wall ventilation window comprises a connection frame 2 connected to a curtain wall column 1, a heat insulation frame 3 installed in the connection frame 2, and a heat insulation window sash 4 hinged to the heat insulation frame 3. The curtain wall ventilation window also comprises a screen 5 and a waterproof shutter 6 installed in the connection frame 2, and the screen 5 and the waterproof shutter 6 are located on the side of the heat insulation frame 3 facing the outside.

[0043] like Figure 2As shown, the connection frame 2 includes a middle pressure plate 7, a first heat insulation strip 8 located between the middle pressure plate 7 and the curtain wall column 1, a middle support member 9, and a first connection bolt 10 that passes through the middle pressure plate 7 and is threadedly connected to the curtain wall column 1. The first heat insulation strip 8 is formed by plugging and matching two small heat insulation strips, and a reserved hole for passing the first connection bolt 10 is formed on the first heat insulation strip 8. The first sealing strip 11 is installed on the side of the curtain wall column 1 facing the middle pressure plate 7 near the inner and outer sides, and the second sealing strip 12 is installed on the side of the middle pressure plate 7 facing the curtain wall column 1 near the inner and outer sides. The middle support member 9 is located between the first sealing strip 11 and the second sealing strip 12 on the outside, and the heat insulation frame 3 is located between the first sealing strip 11 and the second sealing strip 12 on the inside, and the heat insulation frame 3 includes an inner half frame 13, an outer half frame 14, and a second heat insulation strip 15 connecting the inner half frame 13 and the outer half frame 14.

[0044] like Figure 2 As shown, the connection frame 2 also includes an outer pressure plate 16, an outer support member 17 located between the outer pressure plate 16 and the middle pressure plate 7, a second connection bolt 18 threadedly connected to the middle pressure plate 7 after passing through the outer pressure plate 16, and a buckle plate 19 clamped on the outer pressure plate 16 facing the outdoor side. The third sealing strip 20 is installed near the inner and outer sides of the side of the outer pressure plate 16 facing the middle pressure plate 7. The outer support member 17 is located between the third sealing strip 20 on the outer side and the middle pressure plate 7, the screen 5 and the waterproof louver 6 are located between the third sealing strip 20 on the inner side and the middle pressure plate 7, and the waterproof louver 6 is located on the side of the screen 5 facing the outdoor.

[0045] like Figure 3 As shown, the waterproof shutter 6 includes a fan frame 21 and a shutter assembly 22 installed on the fan frame 21. The fan frame 21 is formed by splicing two transverse profiles 23 and two longitudinal profiles 24. The transverse profile 23 and the longitudinal profile 24 have the same profile cross-section, and the difference is only in the cut length of the profile.

[0046] like Figure 4 and Figure 5 As shown, the longitudinal profile 24 includes a support portion 25 and a connecting portion 26 connected to the side of the support portion 25 near the edge. The connecting portion 26 is formed with a groove 27 facing the middle position of the support portion 25, and the bottom of the groove 27 is formed with a slide groove 28 with a width greater than the groove 27.

[0047] like Figure 5 and Figure 6As shown, the shutter assembly 22 includes two brackets 29 and blades 30 detachably connected to the brackets 29. Each bracket 29 includes a plurality of support units 31 arranged in the vertical direction, and each support unit 31 includes a connecting plate 32, a stopper 51 formed on one side of the connecting plate 32 near the upper end, an abutment plate 33 formed in the middle of the same side of the connecting plate 32, and a support member 34 formed on the same side of the connecting plate 32 near the lower end. The width of the connecting plate 32 is slightly smaller than the width of the slide 28. The stopper 51, the abutment plate 33 and the support member 34 are formed with avoidance grooves 35 on both sides near the position of the connecting plate 32, and the support unit 31 is inserted into the slide 28 through the avoidance grooves 35 and slides along the length direction of the slide 28.

[0048] like Figure 6 As shown, a first connection block 36 is formed on the side of the upper edge of the connecting plate 32 facing the stopper 51. The stopper 51 includes a first transverse extension plate 37 tilted downward in a direction away from the connecting plate 32, a first lower extension plate 38 formed at the lower end of the first transverse extension plate 37 and extending downward, and a second lower extension plate 39 formed at the lower surface of the first transverse extension plate 37 and extending downward. A gap is left between the first lower extension plate 38 and the second lower extension plate 39, and the second lower extension plate 39 is an arc-shaped plate protruding toward the connecting plate 32. The supporting member 34 includes a second transverse extension plate 40 tilted downward in a direction away from the connecting plate 32, a third lower extension plate 41 formed at the lower surface of the second transverse extension plate 40 and extending downward, a third transverse extension plate 42 formed at the lower end of the second transverse extension plate 40 and extending horizontally in a direction away from the connecting plate 32, and an upper extension plate 43 formed at one end of the third transverse extension plate 42 extending upward away from the second transverse extension plate 40. A second connection block 44 that cooperates with the first connection block 36 is formed on a side of the third lower extension plate 41 facing the connection plate 32 .

[0049] like Figure 7 As shown, the number of blades 30 is equal to the number of support units 31 on one bracket 29. Each blade 30 includes a vertical first water baffle 45, a first water shed plate 46 formed at the lower end of the first water baffle 45 and tilted downward in a direction away from the first water baffle 45, a second water shed plate 47 formed near the upper end of the first water baffle 45 and extending obliquely downward toward the first water shed plate 46, a second water baffle plate 48 formed at the lower end of the first water baffle 46 and extending downward, a reinforcing strip 49 formed at the lower end of the second water baffle 48 and facing the first water baffle 45, and a contact strip 50 formed on the lower side of the first water shed plate 46.

[0050] like Figure 8As shown, when the support unit 31 is installed on the longitudinal profile 24, multiple support units 31 are placed in the slide groove 28, and the first connection block 36 and the second connection block 44 of two upper and lower adjacent support units 31 are engaged. The support unit 31 is connected to the longitudinal profile 24 by screw connection / adhesion / riveting connection.

[0051] like Fig. 9 and Fig.10 As shown, when installing the blade 30, the upper end of the first water baffle plate 45 of the blade 30 is inserted into the position between the first lower extension plate 38 and the second lower extension plate 39. Then the blade 30 is rotated downward so that the abutment bar 50 and the side of the upper extension plate 43 facing the connecting plate 32 abut, so that the position of the blade 30 is fixed. At this time, the abutment plate 33 abuts against the lower end of the first water baffle plate 45. When the blade 30 is damaged and needs to be replaced, the blade 30 is operated in reverse to remove the blade 30 from the bracket 29.

[0052] Specific use process:

[0053] When ventilation is needed, the heat-insulating window is opened, and the waterproof shutter 6 is used to prevent rain from entering the room during ventilation, and the screen window 5 plays a role in blocking mosquitoes and dust.

[0054] When ventilation is not needed, close the thermal insulation windows to reduce heat exchange between indoor and outdoor air, achieving good thermal insulation effect.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ventilating window for curtain wall, characterized by: The invention comprises a connection frame (2) connected to a curtain wall column (1), a heat-insulating frame (3) installed on the connection frame (2), an openable and closable heat-insulating window sash (4), and a waterproof shutter (6), wherein the waterproof shutter (6) is installed on a side of the heat-insulating frame (3) facing the outdoors, and the waterproof shutter (6) comprises a sash frame (21) and a first water-shedding plate (46) arranged on the sash frame (21), wherein the first water-shedding plate (46) is inclined downwardly toward the outdoors; The connection frame (2) comprises a middle pressure plate (7), a first heat insulation strip (8), a middle support member (9), a first connection bolt (10), a first sealing strip (11), and a second sealing strip (12); the first sealing strip (11) is arranged on the curtain wall column (1); the second sealing strip (12) is arranged on the side of the middle pressure plate (7) facing the curtain wall column (1); the middle support member (9) is located between the first sealing strip (11) and the second sealing strip (12); the heat insulation frame (3) is located between the first sealing strip (11) and the second sealing strip (12); the first heat insulation strip (8) is located between the curtain wall column (1) and the middle pressure plate (7); and the first connection bolt (10) passes through the middle pressure plate (7) and is threadedly connected to the curtain wall column (1); The heat insulation frame (3) comprises an inner half frame (13), an outer half frame (14), and a second heat insulation strip (15) connecting the inner half frame (13) and the outer half frame (14); The connection frame (2) further comprises an outer pressure plate (16), an outer support member (17), a second connection bolt (18), and a third sealing strip (20); the third sealing strip (20) is arranged on the side of the outer pressure plate (16) facing the middle pressure plate (7); the outer support member (17) is arranged between the third sealing strip (20) and the middle pressure plate (7); the waterproof shutter (6) is arranged between the inner third sealing strip (20) and the middle pressure plate (7); the second connection bolt (18) passes through the outer pressure plate (16) and is threadedly connected to the middle pressure plate (7); and the outer pressure plate (16) is clamped with a buckle plate (19) on the side facing the outside of the room; A screen window (5) is provided between the outer pressure plate (16) and the middle pressure plate (7), and the screen window (5) is located on a side of the waterproof shutter (6) facing the interior of the room; The waterproof venetian blind (6) comprises a fan frame (21) and a louver assembly (22) arranged on the fan frame (21); the fan frame (21) is formed by splicing two transverse profiles (23) and two longitudinal profiles (24); the transverse profile (23) and the longitudinal profile (24) both comprise a support portion (25) and a connecting portion (26) connected to the side of the support portion (25) near the edge; the connecting portion (26) is formed with a groove (27) facing the middle position of the support portion (25); the bottom of the groove (27) is formed with a sliding groove (28) having a width greater than the groove (27); the louver assembly (22) comprises a support portion (25); A frame (29) and a blade (30) detachably connected to the frame (29), the frame (29) comprising a plurality of support units (31), each support unit (31) comprising a connecting plate (32), a limiting member (51) formed on one side of the connecting plate (32) close to an upper end position, and a supporting member (34) formed on the same side of the connecting plate (32) close to a lower end position; the width of the connecting plate (32) is smaller than the width of the slide groove (28) and larger than the width of the groove (27), and the limiting member (51), the abutting plate (33) and the supporting member (34) are all formed with avoidance grooves (35) on both sides of the position close to the connecting plate (32); The limiting member (51) comprises a first transverse extension plate (37) formed on the side of the connecting plate (32), a first lower extension plate (38) and a second lower extension plate (39) formed below the first transverse extension plate (37), and a spacing is left between the first lower extension plate (38) and the second lower extension plate (39); the blade (30) comprises a vertical first water baffle (45), a first water shed plate (46) formed at the lower end of the first water baffle (45) and inclined downward in a direction away from the first water baffle (45), and a second water baffle plate (48) formed at the lower end of the first water baffle (46) and extending downward; when the blade (30) is located on the bracket (29), the upper end of the first water baffle (45) is located between the first lower extension plate (38) and the second lower extension plate (39), the supporting member (34) is in contact with the first water shed plate (46), and the second lower extension plate (39) is an arc-shaped plate protruding toward the connecting plate (32); The supporting member (34) comprises an upper extension plate (43) extending upward, and a contact strip (50) is formed on the lower side of the first water-shedding plate (46), and the contact strip (50) contacts the side of the upper extension plate (43) facing the connecting plate (32); The supporting member (34) comprises a second transverse extension plate (40) tilted downward in a direction away from the connecting plate (32) and a third transverse extension plate (42) formed at the lower end of the second transverse extension plate (40) and extending horizontally in a direction away from the connecting plate (32), and the upper extension plate (43) is located at one end of the third transverse extension plate (42) away from the second transverse extension plate (40); A third lower extension plate (41) is formed on the lower surface of the second transverse extension plate (40) extending downward, and a second connection block (44) cooperating with the first connection block (36) is formed on the side of the third lower extension plate (41) facing the connection plate (32); and a first connection block (36) is formed on the side of the upper edge of the connection plate (32) facing the limiting member (51).

Citation Information

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