A wind load graded response existing outer window externally-hung see-through screen system

Abstract

The application discloses a wind load grading response existing outer window external hanging type see-through screen system, relates to the technical field of the external hanging type see-through screen device of the existing outer window, and comprises a sunshade frame cover and a rollable see-through screen body. The top of the sunshade frame cover is provided with a rolling mechanism, the bottom is provided with a locking assembly, and the two sides are provided with side rails. The see-through screen body comprises a transparent screen belt and a flexible pressure relief connecting belt. The flexible pressure relief connecting belt is provided with a pressure difference response pressure relief structure and a deformation response bearing structure. The bearing structure has a preset relaxation amount. When the wind load increases, the pressure relief structure is first opened to form a pressure relief channel, and the bearing structure is tensioned and transmits force after continuous deformation. A guide damping assembly and an overrun trigger linkage mechanism are arranged in the side rail. The damping edge belt is forced to displace horizontally, and the guide damping assembly provides damping buffering. The guide damping assembly is provided with a plurality of horizontal sliding response mechanisms. When any horizontal sliding response mechanism reaches a preset overrun condition, the overrun trigger linkage mechanism releases the locking of the locking assembly, and the rolling mechanism recovers the see-through screen body, so that wind load grading protection is realized.

Description

Technical Field

[0001] This invention relates to the technical field of externally mounted viewing screen devices for existing windows, and more specifically, to an externally mounted viewing screen system for existing windows with wind load graded response. Background Technology

[0002] Adding a roll-up screen to the exterior windows of existing buildings without removing the original windows can create an outer protective layer and form an air buffer cavity of a certain thickness between the screen and the original window when the screen is unfolded. If the screen is made of transparent or highly transparent materials, it can provide external protection, thermal buffering, auxiliary sound insulation, and protection of the original window while maintaining indoor viewing conditions.

[0003] Existing external sunshade roller blinds, windproof roller blinds, and rollable screens mostly adopt continuous curtain fabric, perforated fabric, side rails, and base rod structures. Perforated fabric itself has fixed pores, allowing a certain amount of airflow to pass through, but the porosity is fixed and will affect the clarity of the scenery, lighting, and visual transparency; although continuous transparent sheets have good scenery transparency, they usually lack local pressure relief parts that can automatically change the opening degree according to the pressure difference on both sides of the screen and close again after the pressure difference decreases. When the screen is unfolded, it is easy to withstand large out-of-plane wind pressure and edge tension.

[0004] When wind loads act continuously or repeatedly on a large-area deployed screen, the local stress at different heights and edges may not be uniform, and the load will gradually be transferred to the edges, side rails, and bottom locking parts of the screen. If the screen relies solely on the tension of the material itself or the constraint of a single side edge to bear the wind load, long-term repeated action may cause fatigue in the screen connection areas, edge tearing, corner damage, side rail jamming, or excessive stress on the bottom locking parts.

[0005] Some existing structures use fixed pressure relief holes, flexible sides, single mechanical tripping, or wind speed sensor-controlled retraction. Fixed holes cannot simultaneously meet the requirements of being as closed as possible under normal conditions and expanding pressure relief after wind pressure increases; direct tripping with a single threshold will cause the screen to retract prematurely when it can still be maintained by local pressure relief, delayed load bearing, and side rail damping buffer; solutions that rely on wind speed sensors, motors, and controllers increase the number of power supply, detection, control, and maintenance links.

[0006] In view of this, the applicant hereby submits this application after studying the existing technology. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides an existing external window external viewing screen system with wind load graded response, including a sunshade frame set on the outside of the existing external window and a retractable viewing screen body. The top of the sunshade frame is provided with a retracting mechanism that can automatically retract the viewing screen body, the bottom is provided with a locking component for maintaining the unfolded state of the viewing screen body, and the sides are provided with side rails. The transparent screen body includes a vertically extending transparent screen strip without holes and a flexible pressure relief connecting strip connecting adjacent transparent screen strips, which are arranged alternately in the horizontal direction. The flexible pressure relief connecting strip is provided with a pressure difference response pressure relief structure and a deformation response bearing structure. The deformation response bearing structure has a preset relaxation amount. The pressure difference response pressure relief structure automatically opens and closes to form a pressure relief channel in response to the airflow pressure difference on both sides of the transparent screen body. The pressure difference response pressure relief structure enters the working state before the deformation response bearing structure. When the pressure relief channel begins to form, the deformation response bearing structure is still in a relaxed state. As the flexible pressure relief connecting strip continues to deform laterally to reach the preset amount, the deformation response bearing structure changes from a relaxed state to a tensioned state to transmit tension. Each of the side rails is equipped with a guide damping component and an over-limit trigger linkage mechanism. The two sides of the viewing screen are provided with damping side strips, which slide in cooperation with the guide damping component. The guide damping component can guide the unfolding and rewinding of the viewing screen, and when the viewing screen is unfolded, it allows the damping side strip to generate local lateral displacement within a preset range and provides damping buffer when it is subjected to force. The guide damping component is provided with multiple lateral sliding response mechanisms arranged along the height direction of the side rail. Each lateral sliding response mechanism is linked to the local lateral displacement at the corresponding height position of the damping side strip, and can respond independently to the corresponding local lateral displacement, cooperating with the over-limit trigger linkage mechanism. Both sides of the locking component are provided with release trigger ends. When any horizontal sliding response mechanism on either side reaches the preset over-limit trigger condition, the over-limit trigger linkage mechanism triggers the release trigger end on the corresponding side to release the locking component, so that the winding mechanism can automatically wind up the transparent screen.

[0008] Preferably, the differential pressure response relief structure includes a plurality of self-closing pressure relief holes arranged vertically on the flexible pressure relief connecting strip. Each self-closing pressure relief hole is provided with a single elastic lip. The upper part of the single elastic lip is continuously connected to the flexible pressure relief connecting strip, and its lower side and left and right sides overlap or fit with the corresponding hole edge of the self-closing pressure relief hole. Under the action of differential pressure, the single elastic lip bends and lifts from the lower part towards the low pressure side to form a gradually expanding pressure relief channel.

[0009] Preferably, after the pressure difference decreases, the single elastic lip falls back due to the elastic recovery of the material and / or gravity, so that its lower edge and left and right sides re-overlap or fit with the corresponding hole edge of the self-closing pressure relief hole.

[0010] Preferably, the deformation-response bearing structure includes several bearing bridges arranged vertically, the flexible pressure relief connecting strip arches at corresponding positions to form a closed receiving space, the bearing bridge is located in the closed receiving space, and its two ends are directly connected to two adjacent transparent screen strips respectively; the bearing bridge has a preset relaxation amount, and remains relaxed when the pressure difference response pressure relief structure starts to open, and after the flexible pressure relief connecting strip continues to deform laterally to reach the preset amount, the relaxation amount of the bearing bridge is exhausted and enters a tensioned bearing state.

[0011] Preferably, the transparent screen body has flexible side connecting strips on both sides, which connect the outermost transparent screen strip to the damping edge strip; the flexible side connecting strips have a plurality of side bearing bridges arranged vertically, and the two ends of the side bearing bridges are directly connected to the outermost transparent screen strip and the damping edge strip respectively; the side bearing bridges have a preset slack amount, and are tensioned after the lateral deformation of the flexible side connecting strips reaches the preset amount, thereby forming a subsequent bearing path parallel to the continuous flexible connection path of the flexible side connecting strips.

[0012] Preferably, the guide damping assembly includes a damping groove, the damping side strip is slidably assembled in the damping groove, and the inner wall of the damping groove is provided with a damping surface that cooperates with the damping side strip; a plurality of the lateral sliding response mechanisms are arranged vertically on both outer walls of the damping groove, and can respectively respond to the local lateral displacement of the damping side strip at the corresponding height position to generate different lateral displacements, and when any of the lateral sliding response mechanisms reaches the preset over-limit trigger position, it can be linked with the over-limit trigger linkage mechanism.

[0013] Preferably, each of the lateral sliding response mechanisms includes a fixed bracket fixed to the outer walls of both sides of the damping groove, a lateral sliding body slidably engaged with the fixed bracket, and a first reset spring connecting the lateral sliding body and the fixed bracket to provide a reset force; the lateral sliding body has a damping pressing part at one end near the viewing screen, and an outwardly protruding over-limit trigger baffle is integrally provided on the lateral sliding body; when the damping sideband is subjected to force and generates lateral displacement, the damping pressing part pushes the lateral sliding body to move towards the viewing screen and stretches the first reset spring, and the over-limit trigger baffle is used to output a mechanical trigger displacement to the over-limit trigger linkage mechanism when the lateral sliding body reaches the preset over-limit trigger position.

[0014] Preferably, multiple sets of anti-detachment guide baffles are fixedly provided on the opening side of the damping groove along the height direction to prevent the damping sideband from detaching from the opening of the damping groove; the damping pressing part and the anti-detachment guide baffles are also provided with damping surfaces on the side facing the damping sideband to form a distributed damping pressing system; the damping pressing part and the anti-detachment guide baffles have arc-shaped guide contours on the side facing the winding path of the transparent screen.

[0015] Preferably, the over-limit trigger linkage mechanism includes a vertical trigger rod, a bottom linkage rod, and a second reset spring; there are two vertical trigger rods, which are symmetrically arranged on both sides of the transparent screen, and their upper and lower ends are connected by horizontal bars respectively; the vertical trigger rods are held in a preset initial position by the second reset spring, and the bottom linkage rod is slidably disposed at the bottom of the sunshade frame and connected to the lower horizontal bar; when any of the horizontal sliding bodies reaches the preset over-limit trigger position, the over-limit trigger baffle pushes the corresponding vertical trigger rod to move horizontally toward the center of the transparent screen, and acts on the corresponding release trigger end of the locking component through the bottom linkage rod.

[0016] Preferably, the upper and lower ends of the transparent screen are respectively provided with an upper edge constraint strip and a bottom rod. The upper end of the transparent screen is connected to the winding mechanism through the upper edge constraint strip, and the lower end is locked with the locking component through the bottom rod. The upper edge constraint strip has bendability and its in-plane extension is less than that of the flexible pressure relief connecting strip. Together with the bottom rod, it forms the in-plane constraint of the upper and lower boundaries of the transparent screen in the unfolded state.

[0017] By adopting the above technical solution, the present invention can achieve the following technical effects: 1. Wind load graded response: Through the coordination of differential pressure response pressure relief structure, flexible pressure relief connection strip, deformation response bearing structure with preset relaxation amount, damping side strip and guide damping component, the system can realize pressure relief first, bearing then side rail damping buffer in the process of increasing wind load. After the lateral sliding response mechanism reaches the preset over-limit condition, it is unlocked and then the whole system is retracted, which improves the availability and stability of the transparent screen system in windy weather. 2. Balancing visual transparency and wind resistance: Both the transparent screen strip and the flexible pressure relief connecting strip are made of transparent material. The transparent screen strip forms the main visual area and has no holes in its body; the self-closing pressure relief holes on the flexible pressure relief connecting strip are closed or nearly closed under normal conditions and automatically open when the wind pressure increases, thus balancing visual transparency and adaptive pressure relief requirements. 3. Local mechanical response and over-limit protection: The guide damping component responds to the local lateral displacement of the damping sideband through the lateral sliding response mechanism; when the lateral sliding response mechanism on either side reaches the preset over-limit trigger condition, the over-limit trigger linkage mechanism triggers the release trigger end on the corresponding side to release the locking component and trigger the overall recovery, thereby reducing the reliance on electronic components such as wind speed sensors. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of an existing external window-mounted panoramic screen system with graded wind load response; Figure 2 This is a front view of an existing external window-mounted panoramic screen system with wind load graded response; Figure 3 yes Figure 2 Sectional view of section AA; Figure 4 This is a diagram showing the junction of the transparent screen strip and the flexible pressure relief connecting strip; Figure 5 This is a schematic diagram of the self-closing pressure relief hole; Figure 6 yes Figure 4 Sectional view of section BB; Figure 7 This is a perspective view of the installation of an existing external window-mounted panoramic screen system with wind load graded response. Figure 8 This is a schematic diagram of the locking assembly; Figure 9 This is a schematic diagram of the internal structure of the side rail; Figure 10 This is a cross-sectional view of the side rail; Figure 11 yes Figure 10 A sectional view of section C-C; Figure 12 This is a schematic diagram of the working state of the over-limit trigger linkage mechanism when it is triggered; Figure 13 This is a schematic diagram of four working states of an existing external window-mounted panoramic screen system with wind load graded response. Markings in the diagram: 1-Sunshade frame; 11-Side rail; 12-Wall; 13-Air buffer chamber; 14-Ventilation duct; 2-Viewing screen; 21-Transparent screen strip; 211-Joint reinforcement; 22-Flexible pressure relief connecting strip; 221-Self-closing pressure relief hole; 222-Single-piece elastic lip; 2221-Free fitting part; 2222-Connecting part; 223-Bearing bridge; 23-Damping edge strip; 24-Side edge flexible connecting strip; 241-Side edge bearing bridge; 25-Upper edge restraint screen strip; 26- 3-Bottom rod; 4-Rewinding mechanism; 5-Locking assembly; 6-Release trigger end; 7-Fixing groove; 8-Damping slide groove; 9-Damping surface; 10-Anti-detachment guide baffle; 11-Fixing bracket; 12-Horizontal sliding body; 13-Damping pressing part; 14-Over-limit trigger baffle; 15-First reset spring; 16-Vertical trigger rod; 17-Bottom linkage rod; 18-Guide support; 19-Second reset spring; 20-Horizontal rod; 31-Handle; 42-Manual retraction button. Detailed Implementation

[0020] To make the objectives, technical solutions, and working principles of the embodiments of the present invention clearer, preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are used to illustrate the structure and working process of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] Example Depend on Figures 1 to 13 As shown, this embodiment provides an externally mounted viewing screen system for existing windows with wind load graded response. It is installed on the outside of the windows of existing buildings and includes a sunshade frame 1 and a retractable viewing screen body 2.

[0022] The sunshade frame 1 is fixedly installed on the wall 12 outside the existing building's exterior window. Its top is equipped with a retracting mechanism 3 for retracting the viewing screen 2, which has an automatic retracting function. Side rails 11 are installed on both sides of the sunshade frame 1, and a locking assembly 4 is installed at the bottom. The upper end of the viewing screen 2 is connected to the retracting mechanism 3, and the lower end is connected to a base rod 26. When the viewing screen 2 is lowered into position, the locking assembly 4 locks the base rod 26, keeping the viewing screen 2 in its unfolded state. When the viewing screen 2 is unfolded, an air buffer cavity 13 is formed between it and the existing exterior window. Ventilation ducts 14 can be installed at the upper and lower parts of the sunshade frame 1 according to thermal environment and ventilation requirements. Each side rail 11 is equipped with a guide damping component and an over-limit trigger linkage mechanism. Both sides of the viewing screen 2 are equipped with damping side strips 23. The damping side strips 23 slide in cooperation with the guide damping component. The guide damping component can guide the unfolding and rewinding of the viewing screen 2, and provide damping buffer for the local lateral displacement of the damping side strips 23 when the viewing screen 2 is unfolded and exposed to wind.

[0023] The transparent screen 2 includes a vertically extending, non-perforated transparent screen strip 21 and a flexible pressure-relieving connecting strip 22, which are alternately arranged laterally, i.e., adjacent transparent screen strips 21 are connected by the flexible pressure-relieving connecting strip 22. The transparent screen strip 21 forms the main transparent area and can be bent and rolled up with the roller. Its in-plane elongation is significantly less than that of the flexible pressure-relieving connecting strip 22. Under wind load, it mainly undergoes out-of-plane bending and does not act as a significant tensile component; preferably, a transparent polyester film can be used. The flexible pressure-relieving connecting strip 22 has a large lateral elastic deformation capacity and is preferably made of a transparent thermoplastic polyurethane elastomer film. When positive wind pressure from the outside acts on the unfolded transparent screen, the screen as a whole is concave inward toward the original external window direction. The transparent screen strip 21 mainly undergoes out-of-plane bending, while the flexible pressure-relieving connecting strip 22 expands to the left and right, resulting in lateral stretching, local bulging, and bending.

[0024] The flexible pressure relief connecting strip 22 is equipped with a pressure difference response pressure relief structure and a deformation response bearing structure. The pressure difference response pressure relief structure includes a number of self-closing pressure relief holes 221 arranged vertically at intervals on the flexible pressure relief connecting strip 22. Each self-closing pressure relief hole 221 is provided with a single elastic lip 222. Only the upper part of the single elastic lip 222 serves as a connecting part 2222 and is continuously connected to the flexible pressure relief connecting strip 22. Its lower side and left and right sides are not connected to the corresponding hole edge of the self-closing pressure relief hole 221, but only overlap or fit together, forming a free fitting part 2221. In the initial state of no pressure difference or low pressure difference, the single elastic lip 222 fits with the hole edge, keeping the self-closing pressure relief hole 221 closed or nearly closed. When the airflow pressure difference on both sides of the transparent screen 2 increases, the single elastic lip 222 lifts up from the bottom towards the low-pressure side, and the pressure relief channel gradually expands as the pressure difference increases. After the wind pressure drops, the single elastic lip 222 falls back and re-overlaps or adheres to the hole edge due to the elastic recovery of the material and / or gravity.

[0025] Without changing the relationship that the single elastic lip 222 is only connected at the top and freely overlapped at the bottom and left and right sides, the local thickness, corner transition or smooth area of ​​the single elastic lip 222 can be optimized according to the material properties and opening sensitivity requirements; the above structure is an optional implementation and does not constitute a necessary limitation of this embodiment.

[0026] The deformation-response bearing structure includes several bearing bridges 223, which are arranged vertically at intervals. Flexible pressure-relief connecting strips 22 bulge at corresponding positions on the bearing bridges to form closed receiving spaces. The bearing bridges 223 are placed within these closed receiving spaces, and their ends are directly connected to two adjacent transparent screen strips 21. The bearing bridges 223 have a preset relaxation amount and can be arranged in an arc, wave, bend, or pleat shape in the initial state. When the differential pressure response pressure relief structure begins to open, the bearing bridges 223 remain relaxed. Only after the flexible pressure-relief connecting strips 22 continue to deform laterally to reach the preset amount is the relaxation amount of the bearing bridges 223 exhausted and they enter a tensioned state.

[0027] When the air pressure difference increases, the pressure relief structure first activates to release pressure, and the flexible pressure relief connecting strip 22 undergoes lateral deformation. At this time, the load-bearing bridge 223 is still in a relaxed state and does not bear the main additional tension. When the air pressure difference continues to increase and the lateral deformation of the flexible pressure relief connecting strip 22 reaches the preset amount, the relaxation of the load-bearing bridge 223 is exhausted and it becomes tensile, forming a low-elongation direct load-bearing path across the flexible pressure relief connecting strip 22 between adjacent transparent screen strips 21. This limits the flexible pressure relief connecting strip 22 from further excessive stretching and allows the subsequent tension to be gradually transmitted to the side edge of the transparent screen through the transparent screen strip 21 and the tensioned load-bearing bridge 223.

[0028] Flexible side connecting strips 24 are provided on both sides of the transparent screen body 2 to connect the outermost transparent screen strip 21 with the damping side strip 23. The flexible side connecting strips 24 can be made of the same transparent elastic material as the flexible pressure relief connecting strip 22, but without pressure relief holes. Several side bearing bridges 241 are arranged vertically along the upper edge of the flexible side connecting strips 24, and the two ends of the side bearing bridges 241 are directly connected to the outermost transparent screen strip 21 and the damping side strip 23, respectively. In the initial stage, the flexible side connecting strips 24 form a continuous flexible connection path, and the side bearing bridges 241 remain at a preset slack; when the lateral deformation of the flexible side connecting strips 24 reaches a preset amount, the side bearing bridges 241 are tensioned and form a subsequent direct bearing path parallel to the continuous flexible connection path.

[0029] The load-bearing bridge 223 and the side-edge load-bearing bridge 241, as the main subsequent load-bearing components for delayed intervention, are preferably made of transparent high-strength polyester tape with sufficient width, thickness, or equivalent load-bearing cross-section, so that they can stably bear the additional tensile force after the preset slack is exhausted and tensioned. The width, thickness, cross-sectional area, and preset slack of the load-bearing bridge can be determined according to the screen size, target response conditions, and design wind load, and are not subject to fixed numerical limitations.

[0030] like Figure 9 As shown, a joint reinforcement 211 may be provided at the junction of the transparent screen strip 21 and the flexible pressure relief connecting strip 22. The joint reinforcement 211 is used to improve the tear resistance of the connection area and provide a stable direct connection area for the end of the load-bearing bridge 223. Preferably, the end of the load-bearing bridge 223 forms a reliable connection with the transparent screen strip 21 with a certain length and area, so that the load-bearing bridge can fully transmit the tensile force and reduce local stress concentration after tensioning.

[0031] like Figures 7 to 12As shown, each side rail 11 is equipped with a guide damping assembly and an over-limit trigger linkage mechanism. The guide damping assembly includes a damping groove 51, and the damping side strip 23 is slidably assembled in the damping groove 51. In this embodiment, the damping groove 51 is a U-shaped groove, and its inner wall is provided with a damping surface 511 that cooperates with the damping side strip 23. For example, it can be coated with friction material, surface roughened, or other methods that can provide friction damping. When the damping side strip 23 is subjected to force, it presses against the damping surface 511 and slides relative to it, thereby achieving damping and buffering through friction.

[0032] Multiple lateral sliding response mechanisms are arranged along the height direction of the side rail 11 within the guide damping assembly. These mechanisms convert the lateral displacement of the damping sideband 23 at its corresponding height position into a local response required for subsequent mechanical triggering. Each mechanism can independently respond to the local force at its corresponding position. Specifically, the multiple lateral sliding response mechanisms are arranged vertically on both outer walls of the damping groove 51 and can independently respond to the local lateral displacement of the damping sideband 23 at its corresponding height position. Each lateral sliding response mechanism includes a fixed bracket 52, a lateral sliding body 53, and a first reset spring 54. The fixed bracket 52 includes upper and lower guide portions, each equipped with a ball retaining structure and balls. The balls are fixed in position and can rotate in their original position without translating with the lateral sliding body 53. The lateral sliding body 53 slides in conjunction with the fixed bracket 52 and moves laterally under the guidance of the balls. The first reset spring 54 is connected at one end to the horizontal sliding body 53 and at the other end to the fixed bracket 52. When the horizontal sliding body 53 moves toward the transparent screen, the first reset spring 54 is stretched and stores elastic potential energy, providing a reset force for the horizontal sliding body 53 when the wind pressure drops.

[0033] A damping pressing part 531 is provided at one end of the horizontal sliding body 53 near the viewing screen 2. The damping pressing part 531 has an arc-shaped profile. An outwardly protruding over-limit trigger baffle 532 is integrally provided on the horizontal sliding body 53. The over-limit trigger baffle 532 moves synchronously with the horizontal sliding body 53 and is a trigger output part of the horizontal sliding response mechanism. In the initial state, the horizontal sliding body 53 is in a preset initial position under the action of the first reset spring 54. The damping side strip 23 is always within the constraint range of the damping groove 51 and the anti-detachment structure. When the local force increases, it generates a local lateral displacement in the direction of the opening of the damping groove 51 and presses against the corresponding damping pressing part 531, thereby pushing the horizontal sliding body 53 to move towards the viewing screen. The horizontal sliding body 53 of different heights can generate different displacements according to the local lateral displacement of the damping side strip.

[0034] To prevent the damping strip 23 from detaching from the opening of the damping groove 51, multiple sets of anti-detachment guide baffles 512 are provided along the height direction on the opening side of the damping groove 51. The anti-detachment guide baffles 512 facing the damping strip 23 and the damping pressing part 531 facing the damping strip 23 also have damping surfaces, thus forming a distributed damping pressing system together with the damping surface 511 on the inner wall of the damping groove 51. The anti-detachment guide baffles 512 and the damping pressing part 531 have arc-shaped guide contours on the side facing the winding path of the viewing screen to reduce the risk of jamming during the retraction of the base rod and the screen.

[0035] The over-limit trigger linkage mechanism includes a rigid vertical trigger rod 55, a bottom linkage rod 56, and a second reset spring 57. Two vertical trigger rods 55 are provided within each side rail 11. The two vertical trigger rods 55 of the same side rail are symmetrically arranged on both sides of the viewing screen, and their upper and lower ends are connected by crossbars 58, thus forming a stable vertical trigger rod assembly. The second reset spring 57 connects the crossbar 58 to the fixed part of the side rail 11, thereby allowing the vertical trigger rod assembly to maintain a preset initial position when no external force is applied. The bottom linkage rod 56 is slidably disposed at the bottom of the sunshade frame 1 and connected to the lower crossbar 58. To guide the bottom linkage rod 56, it can be guided by a bottom groove, or one or more guide supports 561 can be provided along its length to prevent the bottom linkage rod 56 from sagging and laterally swaying and to allow its axial translation. When any horizontal sliding body 53 reaches the preset over-limit trigger position, the over-limit trigger baffle 532, which is integrally set with the horizontal sliding body 53, directly pushes the corresponding vertical trigger rod 55 to move horizontally toward the middle of the transparent screen body 2. The vertical trigger rod assembly drives the bottom linkage rod 56 on this side to move axially via the lower horizontal bar 58, and the bottom linkage rod 56 acts on the corresponding release trigger end 41 of the locking assembly 4.

[0036] The entire system is equipped with a locking component 4. The locking component 4 has release trigger ends 41 on both sides. The left and right bottom linkage rods 56 are respectively engaged with the corresponding release trigger ends 41. When any release trigger end 41 is pushed by the corresponding bottom linkage rod 56, the same locking state of the locking component 4 on the transparent screen 2 is released.

[0037] like Figure 12As shown, multiple lateral sliding response mechanisms within the same side rail 11 operate independently. Positions experiencing greater localized force can generate larger displacements, while other positions maintain smaller displacements. When any lateral sliding body 53 on any side first reaches the preset over-limit trigger position, the over-limit trigger baffle 532, integrally formed with the lateral sliding body 53, directly pushes the corresponding vertical trigger rod 55 to move laterally. The vertical trigger rod assembly, via the lower crossbar, drives the bottom linkage rod 56 on that side to move axially. The bottom linkage rod 56 further pushes the corresponding release trigger end 41, causing the locking assembly 4 to release the locking of the viewing screen 2. At the moment of over-limit triggering, the viewing screen 2 remains in the unfolded state; after the locking is released, the winding mechanism 3 drives the viewing screen 2 to retract upwards as a whole.

[0038] In this system, each lateral sliding response mechanism is independent of the others, and lateral sliding bodies 53 of different heights can produce different displacements. As long as any side or any lateral sliding body 53 first reaches the preset over-limit trigger position, the over-limit trigger baffle 532, which is integrated with it, can directly push the corresponding vertical trigger rod 55, and through the bottom linkage rod 56 on that side, act on the locking component 4 to trigger overall retraction; it is not required that multiple lateral sliding bodies on the same side reach the threshold at the same time, nor is it required that the left and right sides reach the threshold at the same time.

[0039] like Figure 7 and Figure 8 As shown, the upper end of the transparent screen 2 is provided with an upper edge constraint strip 25. The upper ends of each transparent strip 21 and the flexible pressure relief connecting strip 22 are connected to the upper edge constraint strip 25, which is then connected to the reel of the winding mechanism 3. The upper edge constraint strip 25 is flexible and can be wound, and its in-plane elongation is less than that of the flexible pressure relief connecting strip 22. The lower end of the transparent screen 2 is connected to a base rod 26, and the locking assembly 4 is provided with a fixing groove 42 that cooperates with the base rod 26 for locking. When the transparent screen 2 is lowered into place, the base rod 26 enters the fixing groove 42 and is locked by the locking assembly 4. In the unfolded state, the upper edge constraint strip 25 and the base rod 26 together form the in-plane constraints of the upper and lower boundaries of the transparent screen 2.

[0040] Under the action of external positive wind pressure, the entire transparent screen 2 is concave inward towards the original external window. Due to the upper and lower boundary constraints of the upper edge of the screen strip 25 and the bottom rod 26, the transparent screen strip 21 mainly undergoes out-of-plane bending without significant in-plane stretching, while the flexible pressure relief connecting strip 22 expands to the left and right sides and undergoes significant lateral elongation and local bulging, so that the larger recoverable deformation required for graded response is mainly concentrated in the area of ​​the flexible pressure relief connecting strip 22.

[0041] In this application, the winding mechanism 3 can be a spring-loaded winding mechanism, and the locking component 4 can be an existing mechanical locking structure such as a spring latch or a rotating hook. The release trigger end 41 of the locking component 4 cooperates with the corresponding bottom linkage rod 56. When the bottom linkage rod 56 moves axially, it pushes the corresponding release trigger end 41, causing the locking component 4 to release the lock on the viewing screen 2. Subsequently, the spring drives the reel to rotate in the recovery direction and automatically winds up the viewing screen 2. The winding mechanism 3 and the locking component 4 can use existing mature devices, and their specific internal structure is not the core of the invention. The system also has a handle 61 and a manual recovery button 62, which are independent manual intervention components. The handle 61 cooperates with the winding mechanism and is used to manually drive the viewing screen to lower and adjust its position as needed. The manual recovery button 62 cooperates with the manual release path of the locking component and is used to manually release the locking component from the bottom rod when needed. After the lock is released, the winding mechanism drives the viewing screen to recover. The manual drive path of the handle and the locking and release path of the manual retraction button are independent of each other. Neither of them changes the mechanical protection path in which the over-limit trigger linkage mechanism automatically releases the lock when the wind load exceeds the limit.

[0042] like Figure 13 As shown, under the influence of gradually increasing external wind pressure, this system forms the following continuous force flow and action chain: the transparent screen strip bends outward and the flexible pressure relief connecting strip expands and deforms → the self-closing pressure relief hole opens first to relieve pressure, at which time the load-bearing bridge remains loose → after the flexible pressure relief connecting strip continues to deform, the looseness of the load-bearing bridge is exhausted and it becomes tense → the subsequent load is gradually transmitted to the side edge of the screen through the transparent screen strip and the tense load-bearing bridge → after the side edge load-bearing bridge is tensed, the subsequent load is directly transmitted to the damping side strip → the damping side strip presses against multiple damping surfaces and dissipates energy through relative sliding → the damping side strip pushes the horizontal sliding body of the corresponding height to move towards the transparent screen and stretches the first reset spring → any horizontal sliding body first reaches the preset over-limit trigger position → the over-limit trigger baffle, which is integrally set with the horizontal sliding body, directly pushes the corresponding vertical trigger rod → the vertical trigger rod assembly drives the bottom linkage rod → the bottom linkage rod acts on the corresponding release trigger end → the locking assembly releases the lock → the winding mechanism retracts the transparent screen.

[0043] To facilitate understanding of the force distribution, force flow transfer, and triggering relationships of structures at different levels under the same wind load input, the following symbolic explanation is provided: F Weff This represents the equivalent effective wind load that continues to act on the corresponding local viewing screen after the pressure relief vent is opened from its closed state, F. W This represents the equivalent wind load ΔF on the corresponding local perspective screen. P F represents the reduction in equivalent wind load due to pressure relief after the pressure relief vent is opened from its closed state. F F represents the tensile force component borne by the flexible pressure relief connecting strip or the flexible side connecting strip. B F represents the tensile force component after the bridge is tensioned. Lx represents the localized combined tensile force that continues to be transmitted to the side edge of the viewing screen. i x represents the displacement of the i-th horizontal sliding body towards the screen. T This indicates a preset over-limit trigger displacement.

[0044] In the initial closed state, the self-closing pressure relief orifice is closed or nearly closed, and the pressure relief reduction is ΔF. P The load is zero or approximately zero; the load-bearing bridge remains relaxed, F B Approximately zero; the lateral sliding body is in its initial position, x i Approximately zero. At this point, the wind load is mainly borne and transferred through the out-of-plane bending of the transparent shield and the initial elastic deformation of the flexible pressure relief connection strip; the transparent shield does not act as a significant tensile member.

[0045] When the self-closing orifice is open and depressurizing, a depressurization channel begins to form from the self-closing orifice. The equivalent effective wind load after depressurization can be expressed as: F Weff =F W -△F P The above formula indicates that in this stage, the effective wind load continuing to be transferred to the viewing screen is first reduced by depressurization through the orifice; at this time, the load-bearing bridge still retains a preset relaxation amount, F. B The value is approximately zero, therefore the system does not immediately bear the additional tensile force from the load-bearing bridge when the self-closing pressure relief hole just opens.

[0046] In the tensioned and side-rail damping buffer state of the load-bearing bridge, the preset slack of the load-bearing bridge is exhausted and it enters the tensioned load-bearing state. B Greater than zero. At the corresponding local force transmission location, the flexible connection path and the load-bearing bridge path jointly bear and transmit the lateral tensile force. Its main force components can be expressed as: F L ≈F F +F B As the load-bearing bridge becomes tensioned, a significant portion of the subsequent new load can be directly transferred through the low-elongation, high-strength load-bearing bridge and gradually converge towards the side edge of the screen. This formula is only used conceptually to represent that the flexible connection path and the tensioned load-bearing bridge path jointly bear and transfer the main lateral tensile force to the side edge, and does not represent a strictly linear superposition under all working conditions. After the load continues to be transferred to the damping sideband, a damping resistance F is generated between the damping sideband and the damping surface. D And some mechanical energy is consumed through relative sliding; during the movement of the lateral sliding body, the first reset spring is stretched and generates an elastic restoring force F. S It is mainly used to store elastic potential energy and drive the lateral sliding body to reset after the wind pressure drops.

[0047] In the over-limit triggering state, as the local force continues to increase, the lateral sliding bodies at different heights will independently generate different displacements based on the local wind load at their locations. Any lateral sliding body on either side of the two side rails will be able to achieve this displacement if the following condition is met: x i ≥x T This means that when the local lateral sliding body reaches the preset trigger position, the over-limit trigger baffle, which is integrally set with the lateral sliding body, directly pushes the corresponding vertical trigger rod, and through the vertical trigger rod assembly on the same side and the bottom linkage rod, acts on the corresponding release trigger end of the locking assembly, causing the locking assembly to release. T The threshold is a mechanical displacement threshold, not a directly measured wind load threshold. Therefore, the system does not require multiple lateral sliding bodies on the same side to reach the threshold simultaneously, nor does it require both sides to reach the threshold simultaneously. Instead, any local exceedance can trigger the unified retraction of the entire transparent screen.

[0048] The above formulas are used to intuitively illustrate the main force components, force flow transfer, and mechanical triggering conditions under four working conditions. Because the large deformation of flexible materials, orifice depressurization, the transition of the load-bearing bridge from relaxation to tension, friction damping, and spring tension may all exhibit nonlinearity and stages, the above formulas do not imply that the force components are strictly linearly superimposed under all working conditions, nor do they constitute limitations on specific force values, displacement values, proportional relationships, material grades, widths, thicknesses, or other dimensional parameters.

[0049] When the wind pressure drops before reaching the over-limit trigger position, the first and second reset springs drive the corresponding components to return to their original positions, the damping sideband returns to the initial area, the deformation of the flexible pressure relief connection band decreases, the load-bearing bridge relaxes, and the single elastic lip falls back and overlaps or fits with the edge of the self-closing pressure relief hole.

[0050] After an over-limit trigger occurs and the system is recovered, the locking components return to a relockable state. When the viewing screen is lowered again, the base rod enters the fixing slot and locks again, allowing the system to be reused.

[0051] The number, size, and vertical spacing of self-closing pressure relief holes, as well as the number and preset slack of load-bearing bridges, can be adjusted according to the width of the transparent screen, material properties, design wind load, and target response conditions. However, the order of opening the self-closing pressure relief holes first and then tensioning the load-bearing bridges should be maintained.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A wind load graded response system for an externally mounted viewing screen on an existing window, comprising a sunshade frame disposed on the outside of an existing window and a retractable viewing screen body, wherein the top of the sunshade frame is provided with a retraction mechanism for automatically retracting the viewing screen body, the bottom is provided with a locking component for maintaining the viewing screen body in an unfolded state, and side rails are provided on both sides, characterized in that: The transparent screen body includes a vertically extending transparent screen strip without holes and a flexible pressure relief connecting strip connecting adjacent transparent screen strips, which are arranged alternately in the horizontal direction. The flexible pressure relief connecting strip is provided with a pressure difference response pressure relief structure and a deformation response bearing structure. The deformation response bearing structure has a preset relaxation amount. The pressure difference response pressure relief structure automatically opens and closes to form a pressure relief channel in response to the airflow pressure difference on both sides of the transparent screen body. The pressure difference response pressure relief structure enters the working state before the deformation response bearing structure. When the pressure relief channel begins to form, the deformation response bearing structure is still in a relaxed state. As the flexible pressure relief connecting strip continues to deform laterally to reach the preset amount, the deformation response bearing structure changes from a relaxed state to a tensioned state to transmit tension. Each of the side rails is equipped with a guide damping component and an over-limit trigger linkage mechanism. The two sides of the viewing screen are provided with damping side strips, which slide in cooperation with the guide damping component. The guide damping component can guide the unfolding and rewinding of the viewing screen, and when the viewing screen is unfolded, it allows the damping side strip to generate local lateral displacement within a preset range and provides damping buffer when it is subjected to force. The guide damping component is provided with multiple lateral sliding response mechanisms arranged along the height direction of the side rail. Each lateral sliding response mechanism is linked to the local lateral displacement at the corresponding height position of the damping side strip, and can respond independently to the corresponding local lateral displacement, cooperating with the over-limit trigger linkage mechanism. Both sides of the locking component are provided with release trigger ends. When any horizontal sliding response mechanism on either side reaches the preset over-limit trigger condition, the over-limit trigger linkage mechanism triggers the release trigger end on the corresponding side to release the locking component, so that the winding mechanism can automatically wind up the transparent screen.

2. The existing external window-mounted panoramic screen system with wind load graded response according to claim 1, characterized in that, The differential pressure response relief structure includes a plurality of self-closing pressure relief holes arranged vertically on the flexible pressure relief connecting strip. Each self-closing pressure relief hole is provided with a single elastic lip. The upper part of the single elastic lip is continuously connected to the flexible pressure relief connecting strip, and its lower side and left and right sides overlap or fit with the corresponding hole edge of the self-closing pressure relief hole. Under the action of differential pressure, the single elastic lip bends and lifts from the lower part towards the low pressure side to form a gradually expanding pressure relief channel.

3. The existing external window-mounted panoramic screen system with wind load graded response according to claim 2, characterized in that, After the pressure difference decreases, the single elastic lip falls back due to the elastic recovery of the material and / or gravity, so that its lower edge and left and right sides re-overlap or fit with the corresponding hole edge of the self-closing pressure relief hole.

4. The existing external window-mounted panoramic screen system with wind load graded response according to claim 1, characterized in that, The deformation-response bearing structure includes several bearing bridges arranged vertically. The flexible pressure relief connecting strip bulges at corresponding positions to form a closed receiving space. The bearing bridge is located within the closed receiving space, and its two ends are directly connected to two adjacent transparent screen strips. The bearing bridge has a preset relaxation amount. It remains relaxed when the pressure difference response pressure relief structure starts to open. After the flexible pressure relief connecting strip continues to deform laterally to reach the preset amount, the relaxation amount of the bearing bridge is exhausted and it enters a tensioned bearing state.

5. The existing external window-mounted panoramic screen system with wind load graded response according to claim 4, characterized in that, The transparent screen body is provided with flexible side edge connecting strips on both sides, and the flexible side edge connecting strips connect the outermost transparent screen strip and the damping edge strip; the flexible side edge connecting strips are provided with a number of side edge bearing bridges arranged vertically, and the two ends of the side edge bearing bridges are directly connected to the outermost transparent screen strip and the damping edge strip respectively; The side-edge bearing bridge has a preset slack amount, and is tensioned after the lateral deformation of the side-edge flexible connecting strip reaches the preset amount, thereby forming a subsequent bearing path parallel to the continuous flexible connecting path of the side-edge flexible connecting strip.

6. The existing external window-mounted panoramic screen system with wind load graded response according to any one of claims 1 to 5, characterized in that, The guide damping assembly includes a damping groove, and the damping side strip is slidably assembled in the damping groove. The inner wall of the damping groove is provided with a damping surface that cooperates with the damping side strip. A plurality of the lateral sliding response mechanisms are arranged vertically on both outer walls of the damping groove, and can generate different lateral displacements in response to the local lateral displacement of the damping side strip at the corresponding height position. When any of the lateral sliding response mechanisms reaches the preset over-limit trigger position, it can be linked with the over-limit trigger linkage mechanism.

7. The existing external window-mounted panoramic screen system with wind load graded response according to claim 6, characterized in that, Each of the lateral sliding response mechanisms includes a fixed bracket fixed to the outer walls of both sides of the damping groove, a lateral sliding body slidably engaged with the fixed bracket, and a first reset spring connecting the lateral sliding body and the fixed bracket to provide a reset force; the lateral sliding body has a damping pressing part at one end near the viewing screen, and an outwardly protruding over-limit trigger baffle is integrally provided on the lateral sliding body; when the damping sideband is subjected to force and generates local lateral displacement, the damping pressing part pushes the lateral sliding body to move towards the viewing screen and stretches the first reset spring, and the over-limit trigger baffle is used to output a mechanical trigger displacement to the over-limit trigger linkage mechanism when the lateral sliding body reaches the preset over-limit trigger position.

8. The existing external window-mounted panoramic screen system with wind load graded response according to claim 7, characterized in that, Multiple sets of anti-detachment guide baffles are fixedly provided along the height direction on the opening side of the damping groove to prevent the damping sideband from detaching from the opening of the damping groove; the damping pressing part and the anti-detachment guide baffles are also provided with damping surfaces on the side facing the damping sideband to form a distributed damping pressing system; the damping pressing part and the anti-detachment guide baffles have arc-shaped guide contours on the side facing the winding path of the transparent screen.

9. The existing external window-mounted panoramic screen system with wind load graded response according to claim 7, characterized in that, The over-limit trigger linkage mechanism includes a vertical trigger rod, a bottom linkage rod, and a second reset spring. Two vertical trigger rods are symmetrically arranged on both sides of the viewing screen, with their upper and lower ends connected by horizontal bars. The vertical trigger rods are held in a preset initial position by the second reset spring. The bottom linkage rod is slidably disposed at the bottom of the sunshade frame and connected to the lower horizontal bar. When any of the horizontal sliding bodies reaches the preset over-limit trigger position, the over-limit trigger baffle pushes the corresponding vertical trigger rod to move horizontally toward the viewing screen, and the bottom linkage rod acts on the corresponding release trigger end of the locking assembly.

10. The existing external window-mounted panoramic screen system with wind load graded response according to claim 1, characterized in that, The transparent screen body has an upper edge constraint strip and a bottom rod that run through its upper and lower ends, respectively. The upper end of the transparent screen body is connected to the winding mechanism through the upper edge constraint strip, and the lower end is locked to the locking component through the bottom rod. The upper edge constraint strip is flexible and its in-plane extension is less than that of the flexible pressure relief connecting strip. Together with the bottom rod, it forms the in-plane constraint of the upper and lower boundaries of the transparent screen body in the unfolded state.

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