Shading and ventilation systems for building curtain walls

Abstract

This invention relates to the field of curtain wall technology, specifically to a sunshading and ventilation system for building curtain walls. The system includes a curtain wall frame installed within a pre-reserved opening in the curtain wall, double-glazed windows installed within the curtain wall frame, and sunshading louvers placed within the inner cavity of the double-glazed windows. A first air duct is located at the top outer side of the curtain wall frame, and a second air duct is located at the bottom outer side. A sealing plug is fitted onto the vertical section of the air duct. A double-stroke shape memory alloy wire and a first support are provided at the top and bottom of the inner cavity of the double-glazed windows. A guide rod slides on the first support and is connected to the sealing plug. Both ends of the double-stroke shape memory alloy wire are connected and fixed to the sealing plug and the first support, respectively. The double-stroke shape memory alloy wire is trained to contract at high temperatures and expand at low temperatures. This invention automatically opens the interlayer ventilation when temperatures rise in summer and automatically closes the ventilation when temperatures drop in winter, achieving autonomous control from environmental perception to action execution.

Description

Technical Field

[0001] This invention relates to the field of curtain wall technology, specifically to a sunshading and ventilation system for building curtain walls. Background Technology

[0002] In double-glazed curtain wall systems, built-in louvers, as shading components integrated within the glass cavity, are a key measure for regulating solar radiation heat gain and improving the indoor light and heat environment. They effectively regulate the light and heat entering the room, serving both lighting and shading functions. Traditional active manual adjustable built-in louvers, while simple and reliable in structure, lack dynamic response capabilities to environmental climate and cannot adjust in real time according to outdoor weather conditions, thus limiting their potential for energy saving and comfort adjustment.

[0003] To enhance the level of intelligence, existing technologies have developed various electric intelligent control systems for the built-in louvers of double-glazed curtain walls. These systems typically use motors to drive the louvers to rotate or raise / lower, and integrate sensors for light, temperature, and other parameters. A central controller then automatically adjusts the louvers based on preset logic or user commands. While this approach achieves a degree of automation, it still presents the following prominent problems when used in existing buildings, especially in scenarios where renovation costs are sensitive and maintenance conditions are limited:

[0004] 1. Reliance on power and complex wiring: The system requires continuous power supply and relies on motors, controllers, sensors and supporting wiring. For renovation projects with limited internal space of the curtain wall cavity and inconvenient wiring, the installation is complicated and costly, and it is not suitable for occasions with unstable power supply or no need for continuous power supply.

[0005] 2. Long-term reliability and maintenance difficulties: The motor and electronic components are in the closed or semi-closed cavity environment of the double-glazed curtain wall for a long time, and are exposed to the effects of high temperature, temperature difference changes, and possible condensation. Their long-term reliability and durability are put to the test. Repair and maintenance after failure require professional personnel, which increases the operation and maintenance costs.

[0006] 3. Insufficient system redundancy and demand matching: For many practical applications, the core requirement is to automatically adjust the louver angle to reduce heat gain in summer or under high temperatures and strong sunlight, and to automatically retract the louvers to utilize solar radiation in winter or when natural lighting is needed. Existing electric systems, with their complex control architectures designed to achieve multiple functions, often appear over-designed and uneconomical for such fundamental and critical requirements. Summary of the Invention

[0007] The purpose of this invention is to provide a shading and ventilation system for building curtain walls to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a sunshading and ventilation system for building curtain walls, comprising a curtain wall frame installed within a pre-reserved opening in the curtain wall, double-glazed windows installed within the curtain wall frame, and sunshading louvers placed within the inner cavity of the double-glazed windows. A first air duct is provided at the top outer side of the curtain wall frame, connecting to the top of the inner cavity of the double-glazed windows. A second air duct is provided at the bottom outer side of the curtain wall frame, connecting to the bottom of the inner cavity of the double-glazed windows. Both the first and second air ducts are composed of connected horizontal and vertical sections, with a movable plug on the vertical section. The double-layer hollow glass cavity is provided with a double-path memory alloy wire at the top and bottom and a first support fixedly arranged horizontally. A vertically distributed guide rod is slidably arranged on the first support. The end of the guide rod near the curtain wall frame is connected to the sealing plug. The double-path memory alloy wire is sleeved on the guide rod and its two ends are respectively connected and fixed to the sealing plug and the first support. The double-path memory alloy wire is trained to contract at the austenite transformation temperature and expand at the martensite transformation temperature. When the double-path memory alloy wire contracts, it opens the sealing plug. When the double-path memory alloy wire expands, it seals the sealing plug.

[0009] Optionally, the top and bottom of the double-layer hollow glass cavity are provided with solar panels, energy storage elements and temperature control switches. The solar panels and energy storage elements are connected, and the energy storage elements, temperature control switches and two-way memory alloy wires are connected in series to form a heating circuit.

[0010] Optionally, the temperature control switch includes a fixedly mounted insulator. A bimetallic strip, a first metal spring, and a contact piece are sequentially spaced on the insulator. A connecting post is installed between the distal end of the bimetallic strip and the distal end of the first metal spring. A stationary contact is provided at the distal end of the contact piece. A second metal spring is mounted on the first metal spring, and a third metal spring is mounted on the second metal spring. A moving metal contact is provided between the third metal spring and the first metal spring. A moving contact is provided on the moving metal contact, and a clearance hole is provided on the second metal spring for the moving contact to pass through. When the bimetallic strip is below its operating temperature, the moving contact separates from the stationary contact. When the bimetallic strip heats up to the operating temperature, the moving contact, driven by the moving metal contact, contacts the stationary contact, and the heating circuit is activated.

[0011] Optionally, the opening end of the vertical section of the air duct is also provided with a micro switch for detecting whether the sealing is in place, and the micro switch is connected in series in the heating circuit.

[0012] Optionally, a bracket is also fixedly provided on the insulator, and an adjusting screw is installed at the far end of the bracket, the adjusting screw being in contact with the second metal spring.

[0013] Optionally, the top of the sunshade louver is provided with a louver shaft for adjusting the louver angle. A transmission assembly is provided between the end of the louver shaft and the guide rod at the top of the double-layer hollow glass cavity. The transmission assembly includes a second support located below the first support. A sleeve is rotatably connected to the second support. The guide rod and the sleeve are circumferentially rotating and axially slidingly engaged. A first short rod is fixedly provided on the outer wall of the guide rod. A guide groove is opened on the sleeve. The first short rod is located in the guide groove. The guide groove is composed of a first vertical groove and an inclined groove that are connected. A worm gear is provided on the sleeve. A worm wheel is provided at the end of the louver shaft. The worm wheel meshes with the worm gear. When the double-stroke memory alloy wire contracts, the guide rod uses the first short shaft to push the inclined groove to rotate the sleeve. Then, the worm gear drives the worm wheel and the louver shaft to rotate in sequence to adjust the louver angle.

[0014] Optionally, a second short shaft is connected to the rear outer wall of the louver shaft, a bushing is slidably sleeved on the rear end of the louver shaft, a V-groove is formed on the front end face of the bushing, a drive shaft is slidably sleeved on the rear end of the bushing, the drive shaft is axially fixed and circumferentially rotatable, a third short shaft is connected to the front outer wall of the drive shaft, a limiting groove is formed on the rear side wall of the bushing, the third short shaft is disposed in the limiting groove, the limiting groove has a right-angled triangular structure, the length of the limiting groove along the axial direction is consistent with the depth of the V-groove, a nut is provided on the drive shaft, a return spring is pressed between the nut and the bushing, and the worm gear is sleeved on the rear end of the drive shaft.

[0015] Optionally, the operating temperature of the bimetallic strip is 28°C, and the martensitic transformation temperature of the two-way memory alloy wire is 15°C.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention organically combines solar power supply, temperature-controlled switch triggering, and dual-path memory alloy wire temperature-sensitive drive. When the temperature rises in summer, the system can automatically and synchronously open the interlayer ventilation and adjust the louvers to the shading angle; when the temperature drops in winter, it automatically resets to close the ventilation and retract the louvers to facilitate lighting. The entire process requires no manual intervention, achieving autonomous control from environmental perception to action execution.

[0018] 2. This invention provides dual power sources and dual temperature protection mechanisms to ensure reliable system operation. The system is designed with two independent power and triggering paths:

[0019] Passive main path: The duct switch is directly driven by the inherent physical response of the two-way memory alloy wire to temperature. This path does not rely on any circuit and is the most basic and reliable guarantee.

[0020] Active auxiliary path: When sunlight is abundant, the solar panels collect energy and power the active heating circuit of the bimetallic wire. This path is controlled by a bimetallic strip with precise temperature control, which can be precisely triggered at specific temperature points to actively accelerate or ensure the execution of shading and ventilation actions, reducing the probability of system failure due to the failure of a single component.

[0021] 3. The present invention utilizes the axial movement of the guide rod, through the first short rod set on it and the vertical and inclined grooves on the sleeve, to transform the linear opening and closing motion of the sealing block into the rotational motion that drives the angle of the sunshade louver, which has the advantage of high coordination.

[0022] 4. The present invention provides a bushing, a V-groove, a return spring and a right-angled triangular limiting groove at the end of the louver drive. This not only allows the drive component to slip when the louver rotates to the correct position or encounters resistance, thus avoiding damage to the mechanism, but also enables mechanical self-locking when the louver is adjusted to a specific angle through the cooperation of the V-groove and the second short shaft. At the same time, it can also retain the existing control method for adjusting the louver angle. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0025] Figure 3 for Figure 1 Enlarged view of section B;

[0026] Figure 4 This is a schematic diagram of the temperature control switch in this invention;

[0027] Figure 5 This is a schematic diagram of the drive mechanism at the end of the louver shaft in this invention.

[0028] In the diagram: 1. Curtain wall frame; 101. First air duct; 102. Second air duct; 103. Horizontal section air duct; 104. Vertical section air duct; 105. Sealing block; 106. First support; 107. Guide rod; 1071. First short rod; 108. Second support; 2. Double-glazed insulated glass; 3. Sunshade louvers; 301. Louver shaft; 3011. Second short shaft; 302. Worm gear; 303. Bushing; 3031. V-groove; 3032. Limiting groove; 304. Drive shaft; 3041. Third short shaft; 305. Nut; 306. Reset spring 4. Spring; 5. Double-pass memory alloy wire; 6. Solar panel; 7. Energy storage element; 8. Temperature control switch; 9. Insulator; 10. Bimetallic strip; 11. First metal spring; 12. Contact piece; 13. Stationary contact; 14. Connecting post; 15. Second metal spring; 16. Clearance hole; 17. Third metal spring; 18. Moving metal contact piece; 19. Moving contact; 20. Bracket; 21. Adjusting screw; 22. Micro switch; 33. Sleeve; 44. First vertical groove; 5. Inclined groove; 6. Worm gear. Detailed Implementation

[0029] 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, and 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.

[0030] See Figures 1 to 5 The present invention provides a highly integrated, adaptive, and intelligently controlled shading and ventilation system for building curtain walls. The core of this system lies in utilizing solar and thermal energy, through a hybrid drive combining pure mechanical and micro-electricity, to achieve coordinated and automatic switching between curtain wall ventilation and heat dissipation and shading / lighting functions, thereby achieving significant building energy-saving effects.

[0031] The main body of the system includes a curtain wall frame 1 installed in a reserved opening in the building's curtain wall. Double-glazed windows 2 are fixedly installed inside the curtain wall frame 1, and the sealed inner cavity formed by the frame is equipped with sunshade louvers 3 that can be adjusted by an external controller or manually.

[0032] To enable external ventilation of the interlayer of glass (i.e., the inner cavity of the double-glazed insulated glass 2), a first air duct 101 and a second air duct 102 are integrally formed or machined at the top and bottom of the outer side of the curtain wall frame 1, respectively. The first air duct 101 connects downward to the top of the inner cavity of the double-glazed insulated glass 2, and the second air duct 102 connects upward to the bottom of the inner cavity. Each air duct is an L-shaped channel consisting of a horizontal section duct 103 located inside the curtain wall frame 1 and a vertical section duct 104 leading to the inner cavity of the double-glazed insulated glass 2. At the end of the vertical section duct 104, a rubber sealing plug 105 is movably engaged for opening and closing the air duct.

[0033] At the top and bottom of the glass interlayer (near the two air duct openings), an identical direct temperature-sensitive drive unit is installed. This unit includes: a first support 106 fixed to the inner wall of the curtain wall frame 1 within the glass interlayer and horizontally distributed; a vertically arranged guide rod 107, one end of which is connected to the sealing plug 105 near the curtain wall frame 1 and can slide up and down along the guide hole on the first support 106; and a double-path shape memory alloy wire 4 sleeved on the guide rod 107. Both ends of the alloy wire are fixed to the sealing plug 105 and the first support 106 respectively, and are trained to have the inherent physical properties of axial contraction at high temperatures (austenite transformation temperature, such as above 28°C) and axial expansion at low temperatures (martensite transformation temperature, such as below 15°C), thereby enabling the opening or sealing of the sealing plug 105.

[0034] Small solar panels 5 are attached to the non-visible areas (such as the edges) at the top and bottom of the inner cavity of the double-glazed insulated glass 2, and their output ends are connected to energy storage elements 6 composed of micro lithium batteries. Temperature control switches 7 are also provided at the top and bottom of the inner cavity of the double-glazed insulated glass 2. The energy storage element 6, the temperature control switch 7, and the two-way memory alloy wire 4 are connected in series to form a heating circuit.

[0035] The temperature control switch 7 includes an insulator 701 with a columnar structure fixedly attached to glass. A bimetallic strip 702, a first metal spring 703, and a contact piece 704 are sequentially and spaced apart on the insulator 701. The distal end of the bimetallic strip 702 is rigidly connected to the distal end of the first metal spring 703 via a connecting post 705. A stationary contact 7041 is provided at the end of the contact piece 704. A second metal spring 706 is provided on the first metal spring 703, and a third metal spring 707 is mounted on the second metal spring 706. A moving metal contact 708 is sandwiched between the third metal spring 707 and the first metal spring 703. A moving contact 7081 is welded onto the moving metal contact 708. A clearance hole 7061 is provided on the second metal spring 706 for the moving contact 7081 to pass through.

[0036] When the ambient temperature is below a set value (e.g., 28°C), the bimetallic strip 702 separates the moving contact 7081 from the stationary contact 7041. When the temperature reaches the set value, the bimetallic strip 702 bends due to heat, pushing the moving metal contact 708 upward, causing the moving contact 7081 to contact the stationary contact 7041, thereby activating the heating circuit. The electrical energy stored in the energy storage element 6 is released instantaneously, and the current flows through the double-pass memory alloy wire 4, causing it to rapidly heat up in Joules, thus actively triggering its contraction.

[0037] A microswitch 8 is installed at the opening end of the vertical section of the air duct 104 (see...). Figure 2 The circuit is connected in series with the aforementioned heating circuit. When the sealing block 105 blocks the vertical section of the air duct 104, the micro switch 8 is pressed and closed. At this time, the moving contact 7081 contacts the stationary contact 7041, which connects the heating circuit. When the sealing block 105 opens the vertical section of the air duct 104, the micro switch 8 is released from pressure and opens, thereby automatically cutting off the heating circuit, achieving energy saving and component protection.

[0038] A bracket 709 is also fixedly installed on the insulator 701. An adjusting screw 710 is threadedly connected to the far end of the bracket 709. The adjusting screw 710 is in contact with the second metal spring 706 and is used to adjust the trigger temperature of the bimetallic strip 702.

[0039] This invention also links the opening and closing of the vertical air duct 104 with the angle adjustment of the sunshade louvers 3 through a transmission assembly. Specifically, the top of the sunshade louvers 3 is provided with a louver shaft 301 for adjusting the louver angle. The transmission assembly is provided between the end of the louver shaft 301 and the adjacent guide rod 107. The transmission assembly includes a second support 108 fixed to the inner wall of the curtain wall frame 1 in the glass interlayer and located below the first support 106, on which a rotatable sleeve 9 is installed. The guide rod 107 extends downward and passes through the sleeve 9, and the two can rotate circumferentially and slide axially relative to each other. A radial first short rod 1071 is fixed to the outer wall of the guide rod 107. A guide groove is machined on the wall of the sleeve 9. The guide groove consists of a vertical first groove 901 and an inclined groove 902 connected to its end. The end of the first short rod 1071 is inserted into this guide groove. The lower end of the sleeve 9 is connected to a worm gear 903, and the end of the louver shaft 301 of the sunshade louver 3 is fixed with a worm wheel 302, which meshes with the worm gear 903 on the sleeve 9.

[0040] Working principle of linkage:

[0041] Low temperature static state: the double-pass memory alloy wire 4 is relaxed, the guide rod 107 is at the highest position, the first short rod 1071 is located in the first vertical groove 901, the sealing plug 105 is closed, the sleeve 9 does not rotate, and the sunshade louver 3 is retracted.

[0042] High-temperature operation period: As the temperature rises, the double-stroke memory alloy wire 4 contracts, pulling the guide rod 107 downward.

[0043] Phase 1 (Pure ventilation activation): The first short rod 1071 descends vertically within the first vertical groove 901, causing the sealing plug 105 to open the air duct. At this time, the sleeve 9 is not driven, and the sunshade louvers 3 remain stationary.

[0044] The second stage (ventilation and sunshade linkage): When the sealing plug 105 is fully open, the first short rod 1071 descends to the junction of the first vertical groove 901 and the inclined groove 902. Continuing downwards, the first short rod 1071 enters the inclined groove 902. Due to the constraint of the inclined groove 902, the axial movement of the guide rod 107 is converted into the rotational movement of the sleeve 9. The sleeve 9 drives the louver shaft 301 to rotate via the worm gear 903 and worm wheel 302, opening the sunshade louvers 3. The self-locking characteristics of the worm gear 302 and worm 903 ensure the stability of the louver angle.

[0045] Low-temperature reset period: The process is reversed. The guide rod 107 moves upward, the first short rod 1071 first moves upward along the inclined groove 902, driving the sunshade louvers 3 to retract, then enters the first vertical groove 901, and finally closes the air duct.

[0046] To prevent the transmission assembly from jamming and to enhance the wind resistance stability of the louvers, a second short shaft 3011 is fixed to the outer wall of the rear end of the louver shaft 301. A bushing 303 is slidably fitted at the rear end of the louver shaft 301, and a V-groove 3031 is machined on the front end face of the bushing 303. A drive shaft 304 (i.e., the drive shaft 304 of the worm gear 302) is slidably fitted at the rear end of the bushing 303. The drive shaft 304 is axially fixed and circumferentially rotatable, and a third short shaft 3041 is fixed to its front end. A right-angled triangular limiting groove 3032 is opened on the rear side wall of the bushing 303, and the third short shaft 3041 is placed in it. The axial length of the limiting groove 3032 is the same as the depth of the V-groove 3031. A nut 305 is screwed onto the drive shaft 304, and a return spring 306 is pressed between the nut 305 and the rear end face of the bushing 303.

[0047] Normal transmission: When the drive shaft 304 rotates, the third short shaft 3041 pushes the bushing 303 to rotate together through the inclined surface of the limiting groove 3032. The bushing 303 pushes the second short shaft 3011 through the inclined surface of the V-groove 3031, which drives the louver shaft 301 to rotate.

[0048] Angle self-locking: When the sunshade louver 3 is rotated to its limit angle (such as fully extended / retracted), the second short shaft 3011 slides into the bottom of the V-groove 3031. Under the action of the return spring 306, the inclined surface of the V-groove 3031 weds the second short shaft 3011 tightly, realizing mechanical self-locking and resisting wind disturbance.

[0049] Overload protection: If the rotation of the louver shaft 301 is obstructed, the continuous torque of the drive shaft 304 will force the second short shaft 3011 in the V-groove 3031 to disengage, disconnecting the transmission and allowing the drive shaft 304 to idle, thus protecting the entire transmission chain. After the resistance disappears, the return spring 306 re-engages the mechanism.

[0050] Furthermore, when adjusting the louver angle via an external controller or manually, the worm gear 903 and worm wheel 302 have a reverse self-locking function, so the louver shaft 301 rotates while the drive shaft 304 remains stationary. At this time, the second short shaft 3011 pushes the inclined wall of the V-groove 3031 to the return spring 306 until the second short shaft 3011 disengages from the V-groove 3031 and the louver shaft 301 rotates on its own. This ensures that the existing active louver angle adjustment control method and the linkage control method of the transmission components do not affect each other, making adjustment convenient.

[0051] Working principle: In summer, the air in the glass interlayer is heated by the sun, exceeding 28°C. The bidirectional shape memory alloy wire 4 passively contracts, initiating a ventilation and shading linkage program. Simultaneously, the solar panel 5 generates and stores electricity. When the temperature sensed by the temperature control switch 7 reaches 28°C (potentially before the interlayer air), the circuit closes, and electrical energy actively heats the shape memory alloy wire, ensuring or accelerating its operation. These two pathways work together or sequentially, ultimately opening the top and bottom air ducts, enhancing ventilation and heat dissipation in the glass interlayer, cooling the shading louvers 3, and automatically adjusting the shading louvers 3 to shading mode to block direct sunlight.

[0052] In winter, when the temperature drops below 15°C, the double-pass shape memory alloy wire 4 expands and blocks the air duct to maintain the heat insulation performance of the air in the glass interlayer, while the sunshade louvers 3 retract to maximize the introduction of sunlight.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sun-shading ventilation system for building curtain wall, comprising a curtain wall frame (1) installed in a reserved hole of the curtain wall, a double-layer hollow glass (2) installed in the curtain wall frame (1), and a sun-shading louver (3) placed in the inner cavity of the double-layer hollow glass (2), characterized in that: The outer top of the curtain wall frame (1) is provided with a first air duct (101) communicated to the top of the inner cavity of the double-layer hollow glass (2), and the outer bottom of the curtain wall frame (1) is provided with a second air duct (102) communicated to the bottom of the inner cavity of the double-layer hollow glass (2), the first air duct (101) and the second air duct (102) are both combined by a communicated horizontal section air duct (103) and a vertical section air duct (104), the vertical section air duct (104) is movably plugged with a plugging plug (105); the top and bottom of the inner cavity of the double-layer hollow glass (2) are both provided with a double-path memory alloy wire (4) and a first support (106) fixedly arranged and horizontally distributed, a vertically distributed guide rod (107) is slidably arranged on the first support (106), one end of the guide rod (107) close to the curtain wall frame (1) is connected with the plugging plug (105), the double-path memory alloy wire (4) is sleeved on the guide rod (107) and both ends thereof are respectively connected and fixed with the plugging plug (105) and the first support (106), the double-path memory alloy wire (4) is trained to contract at the austenite transformation temperature and dilate at the martensite transformation temperature, the double-path memory alloy wire (4) opens the plugging plug (105) when contracting, and the double-path memory alloy wire (4) blocks the plugging plug (105) when dilating; The top of the sunshade louver (3) is provided with a louver shaft (301) for adjusting the angle of the louver, a transmission assembly is arranged between the end of the louver shaft (301) and the guide rod (107) at the top of the inner cavity of the double-layer hollow glass (2), the transmission assembly comprises a second support (108) arranged below the first support (106), a sleeve (9) is rotatably connected to the second support (108), the guide rod (107) is in axial sliding fit with the sleeve (9) in circumferential rotation, a first short rod (1071) is fixedly arranged on the outer wall of the guide rod (107), a guide groove is arranged on the sleeve (9), the first short rod (1071) is arranged in the guide groove, the guide groove is combined by a first vertical groove (901) and an inclined groove (902) in communication, a worm is arranged on the sleeve (9), the end of the louver shaft (301) is provided with a worm wheel (302), the worm wheel (302) is engaged with the worm, when the double-path memory alloy wire (4) contracts, the guide rod (107) pushes the inclined groove (902) to make the sleeve (9) rotate, and then the worm drives the worm wheel (302) and the louver shaft (301) to rotate in sequence to adjust the angle of the louver.

2. The solar shading and ventilation system for building curtain wall according to claim 1, characterized in that: The top and bottom of the inner cavity of the double-layer hollow glass (2) are both provided with a solar cell panel (5), an energy storage element (6) and a temperature control switch (7), the solar cell panel (5) and the energy storage element (6) are connected, the energy storage element (6), the temperature control switch (7) and the double-path memory alloy wire (4) are sequentially connected in series and form a heating circuit.

3. The solar shading and ventilation system for building curtain wall according to claim 2, characterized in that: The temperature control switch (7) comprises a fixedly arranged insulator (701), a bimetallic strip (702), a first metal spring (703) and a contact piece (704) are sequentially and spaced apart arranged on the insulator (701), a connecting column (705) is arranged between the distal end of the bimetallic strip (702) and the distal end of the first metal spring (703), a second metal spring (706) is arranged on the first metal spring (703), a third metal spring (707) is arranged on the second metal spring (706), a metal movable contact piece (708) is arranged between the third metal spring (707) and the first metal spring (703), a movable contact (7081) is arranged on the metal movable contact piece (708), and an avoiding hole (7061) is formed in the second metal spring (706) and used for allowing the movable contact (7081) to pass through; when the bimetallic strip (702) is below the action temperature, the movable contact (7081) is separated from the static contact (7041), when the bimetallic strip (702) is heated to the action temperature, the movable contact (7081) is contacted with the static contact (7041) under the driving of the metal movable contact piece (708), and the heating circuit is connected.

4. The solar shading and ventilation system for building curtain wall according to claim 3, characterized in that: The opening end of the vertical section air duct (104) is further provided with a micro switch (8) for detecting whether the plugging plug (105) is in place, and the micro switch (8) is connected in series in the heating circuit.

5. The solar shading and ventilation system for building curtain wall according to claim 3, characterized in that: The insulator (701) is further fixedly provided with a support (709), and the distal end of the support (709) is provided with an adjusting screw (710) which is in contact with the second metal spring (706).

6. The solar shading and ventilation system for building curtain wall according to claim 1, characterized in that: The rear end outer wall of the louver shaft (301) is connected with a second short shaft (3011), the rear end of the louver shaft (301) is slidingly sleeved with a shaft sleeve (303), the front end face of the shaft sleeve (303) is provided with a V-shaped groove (3031), the rear end of the shaft sleeve (303) is slidingly sleeved with a driving shaft (304), the driving shaft (304) is fixedly arranged in the axial direction and rotationally arranged in the circumferential direction, the front end outer wall of the driving shaft (304) is connected with a third short shaft (3041), the rear section side wall of the shaft sleeve (303) is provided with a limiting groove (3032), the third short shaft (3041) is arranged in the limiting groove (3032), the limiting groove (3032) has a right triangle structure, the length of the limiting groove (3032) in the axial direction is consistent with the depth of the V-shaped groove (3031), the driving shaft (304) is provided with a nut (305), the reset spring (306) is arranged in compression between the nut (305) and the shaft sleeve (303), and the rear end of the driving shaft (304) is sleeved with the worm wheel (302).

7. The solar shading and ventilation system for building curtain wall according to claim 3, characterized in that: The action temperature of the bimetallic strip (702) is 28 DEG C, and the martensite transformation temperature of the double-path memory alloy wire (4) is 15 DEG C.

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