Extremely narrow electric shutter driven by double-shaft synchronous belt

Abstract

The utility model discloses an extremely-narrow electric shutter driven by a double-shaft synchronous belt, and belongs to the technical field of building sunshade. The device comprises a symmetrical window frame composed of a top frame, a bottom frame and side frames, a driving shaft mechanism is arranged in the top frame, and a double-output-shaft gear motor is arranged in the bottom frame. The driving shaft mechanism comprises a rotating shaft, driven belt wheels at the two ends of the rotating shaft, a winding reel and an overturning wheel, an output shaft of the motor is connected with the driving belt pulley and the traction rope winding wheel, and the driving belt pulley and the driven belt pulley form a 1: 1 closed-loop transmission system through a polyurethane synchronous belt. And the bottom beam traction rope is reversely wound on the traction rope winding wheel and forms a bidirectional traction compensation path with the curtain blade lifting rope. Accumulated errors are eliminated through synchronous belt transmission, the defect of dead weight is overcome through reverse traction compensation, the operation stability is improved through a symmetrical structure, the technical problems that an extremely-narrow shutter is prone to deflection in the ultra-high stroke, gaps are not uniform, and the installation space is limited are solved, and the ultra-narrow shutter is suitable for high-end building sunshade scenes.

Description

Technical Field

[0001] This utility model relates to the field of building sunshade, and in particular to an ultra-narrow electric louver with dual-axis synchronous belt drive. Background Technology

[0002] As an important product in the field of architectural sun shading, the reliability of the transmission mechanism of motorized louvers directly affects their performance. Currently, the industry commonly uses a rope-driven transmission device, which uses a motor to drive a roller to raise and lower the rope to achieve the raising and lowering of the louvers. This structure has become a relatively mature technical solution for standard-sized applications.

[0003] However, traditional technical solutions have revealed significant shortcomings when dealing with special application scenarios involving ultra-narrow louvers (blade width less than 40mm) and installation heights exceeding 5 meters. Firstly, due to the extremely narrow width and light weight of the louvers themselves, they cannot provide sufficient self-weight for smooth lowering during ultra-high strokes, easily leading to operational malfunctions such as jamming and skewness. Secondly, the inherent cumulative error in rope length of the winding mechanism exhibits a linear amplification trend during ultra-high strokes. When applied to ultra-narrow louvers, the error in a single transmission will have a multiplier effect due to the narrowing blade characteristics, resulting in visible uneven gaps and misalignment in the louver array. Furthermore, traditional winding mechanisms suffer from poor structural stability and complex installation and debugging due to the asymmetrical arrangement of transmission components on both sides, making it difficult to meet the stringent precision requirements of high-end buildings for shading products. Currently, no effective solution has been found that simultaneously addresses the aforementioned issues of transmission accuracy, self-weight dependence, and structural stability, which has become a technical bottleneck restricting the widespread application of ultra-narrow ultra-high motorized louvers. Utility Model Content

[0004] The technical objective of this invention is to propose an ultra-narrow electric louver with dual-axis synchronous belt drive to solve problems such as difficulty in lowering the louver due to insufficient weight during ultra-high strokes, significant amplification of cumulative errors in traditional rope winding drives affecting aesthetics, and insufficient stability caused by asymmetrical arrangement of the transmission mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A very narrow electric Venetian blind with dual-axis synchronous belt drive, characterized in that: it includes a rectangular window frame composed of a top frame, a bottom frame, and two side frames; glass cover plates glued to both sides of the window frame; and Venetian blinds installed within the window frame. The Venetian blinds include a blind body, a bottom beam, and a bottom beam traction rope passing through the bottom beam. A drive shaft mechanism is provided within the top frame. This drive shaft mechanism includes a rotating shaft horizontally penetrating the top frame, two winding drums symmetrically fixed in the middle of the rotating shaft, bearing seats supporting both ends of the rotating shaft, a tilting wheel located at the outer end of the winding drums, and driven pulleys located at both ends of the rotating shaft. The winding drums are wound with slat lifting ropes that control the raising and lowering of the blind body, and the tilting wheels are wound with control... The slats are adjusted using a slat-turning rope. A dual-output shaft reduction motor is installed within the bottom frame, with a drive pulley and a traction rope winding pulley mounted at the ends of the two output shafts. The drive pulley forms a closed-loop synchronous drive system with the corresponding driven pulley via a synchronous belt surrounding the side frame, achieving a 1:1 transmission ratio. The two ends of the bottom beam traction rope extend downwards and are fixed to the traction rope winding pulleys at both ends of the dual-output shaft reduction motor in a spiral winding manner, forming a second synchronous traction path independent of the slat lifting rope. The winding drum and the slat-turning pulley adopt a coaxial nested structure, and the traction rope winding pulley is rigidly connected coaxially to the drive pulley.

[0007] Further optimization of the technical solution: the synchronous belt is a polyurethane synchronous belt with arc-shaped or trapezoidal teeth and anti-loosening reinforcing ribs on its inner side.

[0008] In a further optimized technical solution, the output shaft end of the dual-output-shaft geared motor is provided with a keyway structure, and the traction rope winding wheel is connected to the keyway by an interference fit through a flat key.

[0009] In a further optimized technical solution, the winding direction of the bottom beam traction rope is opposite to that of the curtain leaf lifting rope.

[0010] A further optimized technical solution is provided, wherein corner connectors are provided at the four corners of the window frame, and the corner connectors include spacer pins and corner seats; the spacer pins are fixed to the top surface of the corner seats by screws; the corner seats are provided with pulley cavities inside, the active pulleys are respectively set in the pulley cavities of the two bottom corner connectors, and the passive pulleys are respectively set in the pulley cavities of the two top corner connectors.

[0011] A further preferred technical solution is that the top frame and the bottom frame have the same structure and are symmetrically arranged vertically. The structure includes a frame body and a partition strip. The partition strip is horizontally arranged on the outer side of the frame body, and its two ends are inserted into the partition strip pins of the corner connectors on both sides.

[0012] In a further optimized technical solution, the corner seat has horizontal and vertical pins that are perpendicular to each other. The horizontal pins are inserted into the frame of the corresponding top or bottom frame, and the vertical pins are inserted into the frame of the corresponding side frame.

[0013] In a further optimized technical solution, the side frame is provided with a partition cavity, a belt cavity, and a slat side storage groove in sequence from the outside to the inside; the partition cavity contains a molecular sieve; the synchronous belt is placed in the belt cavity, and the two sides of the venetian blind are stored in the slat side storage groove; the vertical pin of the corner seat is inserted into the partition cavity.

[0014] A further preferred technical solution is that the top frame has a drive shaft cavity and a slat storage groove inside; the drive shaft mechanism is located in the drive shaft cavity, the slat storage groove is located at the lower part of the drive shaft cavity, and the two are connected by a wire hole; the top of the Venetian blind is stored in the slat storage groove.

[0015] A further optimized technical solution is provided in which a motor cavity and a bottom beam storage groove are provided within the frame of the bottom frame; the dual output shaft reduction motor is located in the motor cavity, and the bottom beam of the venetian blind is stored in the bottom beam storage groove after it is fully unfolded.

[0016] The beneficial effects of this utility model are reflected in the following aspects:

[0017] 1. Improved Transmission Accuracy and Synchronization: A dual-output shaft geared motor, coupled with a closed-loop synchronous drive system on both sides, connects the active and passive pulleys with a 1:1 polyurethane synchronous belt. Combined with a toothed reinforcing rib design, this effectively eliminates the cumulative error caused by rope length expansion and contraction in traditional rope winding transmissions. Actual test data shows that the transmission error can be controlled within ±1mm within a 5-meter stroke. Especially for extremely narrow blades less than 40mm, this synchronous drive structure reduces the gap deviation rate between adjacent blades to below 0.5%, fundamentally solving the misalignment problem caused by the error multiplication effect during ultra-high strokes.

[0018] 2. Enhanced operational stability: The winding drum and the tilting wheel adopt a coaxial nested structure, combined with the rigid connection design between the traction rope winding wheel and the drive belt pulley, to achieve axial force self-balancing for both lifting and tilting actions. This symmetrical layout ensures uniform torque distribution throughout the transmission mechanism. Finite element analysis has verified that the vibration amplitude is reduced by 62% compared to the asymmetrical structure, and it can still maintain stable operation under extreme load conditions, completely overcoming the skew and jamming defects caused by traditional single-sided drive.

[0019] 3. Reduced dependence on self-weight: The independently designed second synchronous traction path features an innovative structure where the bottom beam traction rope and the louver lifting rope are wound in opposite directions, forming a two-way traction compensation mechanism. When the louvers are lowered, the active release of the bottom beam traction rope and the synchronous winding of the louver lifting rope generate a synergistic force, enabling the system to maintain a uniform lowering speed even when the blades' self-weight is insufficient. This successfully overcomes the technical limitation of traditional solutions where a stroke of more than 5 meters must rely on the blades' self-weight.

[0020] 4. Optimized Structural Integration: The window frame adopts a symmetrical design, combined with the pulley cavity in the corner connector and the plug-in spacer installation structure, to achieve integrated assembly of the drive component and the frame. The composite layout of the molecular sieve spacer cavity and the side storage groove of the blinds ensures airtightness while reducing the width of the side frame, perfectly adapting to the installation space requirements of ultra-narrow louvers.

[0021] The synergistic effect of the above-mentioned technical features gives this solution significant technical advantages in terms of transmission accuracy, operational stability and structural compactness. It successfully overcomes the long-standing technical bottleneck in the field of ultra-narrow ultra-high electric louvers and has outstanding substantive features and significant progress. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the frame structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the longitudinal section structure of the top frame of the window frame.

[0024] Figure 3 This is a schematic diagram of the longitudinal section structure of the bottom frame of the window frame.

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the side frame of the window frame.

[0026] Figure 5 This is a schematic diagram of the internal transmission system structure of this utility model.

[0027] Figure 6 This is a structural schematic diagram of the corner connector.

[0028] In the diagram: 1-Top frame, 2-Bottom frame, 3-Side frame, 4-Corner connector, 5-Venetian blind, 6-Dual output shaft geared motor, 8-Polyurethane synchronous belt, 101-Drive shaft cavity, 102-Slat storage slot, 110-Frame, 120-Separator strip, 201-Motor cavity, 202-Bottom beam storage slot, 301-Separator strip cavity, 302-Belt cavity, 303-Slat side storage slot, 401-Separator strip cavity 402-Horizontal pin, 403-Vertical pin, 404-Pulley cavity, 501-Bottom beam, 502-Curtain body, 503-Bottom beam traction rope, 601-Drive pulley, 602-Traction rope winding wheel, 701-Shaft, 702-Shaft seat, 703-Winding drum, 704-Shelf lifting rope, 705-Tilting wheel, 706-Shelf tilting rope, 707-Passive pulley. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] I. Window frame and related component structure

[0031] like Figures 1 to 4 As shown, the ultra-narrow electric louver with dual-axis synchronous belt drive includes a rectangular window frame consisting of a top frame 1, a bottom frame 2, and two side frames 3. The top frame 1 and the bottom frame 2 are perpendicularly inserted into the two side frames 3 via corner connectors 4. Wherein:

[0032] The top frame 1 and the bottom frame 2 have the same structure and are arranged symmetrically at the top and bottom. Their structure includes: frame 110 and partition 120.

[0033] Top frame 1: Its frame is divided into a drive shaft cavity 101 and a slat storage groove 102. The drive shaft cavity 101 is located at the top of the top frame 1, and the slat storage groove 102 is located below the drive shaft cavity 101 and is connected through a wire hole. It is used to store the top of the Venetian blind 5.

[0034] Bottom frame 2: Its interior is divided into a motor cavity 201 and a bottom beam storage groove 202. The motor cavity 201 is fixed with a dual output shaft reduction motor 6. The bottom beam storage groove 202 is used to accommodate the bottom beam 501 when the louvers are fully extended.

[0035] Symmetrical design technology effect: The top frame 1 and the bottom frame 2 adopt a symmetrical cavity layout, which improves the installation efficiency by 40% in actual tests and eliminates the torque off-center load problem of traditional asymmetrical structures.

[0036] The side frame 3 has a partition strip cavity 301, a belt cavity 302, and a slat side storage groove 303 arranged sequentially from the outside to the inside. The partition strip cavity 301 is filled with a molecular sieve, and the partition strip cavity 301 is correspondingly inserted into the vertical pin 403 of the corner connector. The belt cavity 302 is used to store the polyurethane synchronous belt 8, and the slat side storage groove 303 is used to store the side of the Venetian blind 5.

[0037] Venetian blind 5: placed inside the window frame, including blind body 502, bottom beam 501 and bottom beam traction rope 503 passing through the bottom beam.

[0038] Glass cover plates are glued to both sides of the window frame.

[0039] II. Drive shaft mechanism and synchronous transmission system:

[0040] like Figure 5As shown, the drive shaft mechanism is disposed within the drive shaft cavity 101 of the top frame 1, and includes:

[0041] Rotating shaft 701: horizontally penetrates the top frame 1, and is fixed at both ends by bearings 702;

[0042] Winding drum 703: Symmetrically fixed in the middle of the rotating shaft 701, with curtain slat lifting rope 704 wound around it, used to control the lifting of the Venetian blind 5;

[0043] Tilting wheel 705: Coaxially nested on the outside of the winding drum 703, with a leaf turning rope 706 wound around it for adjusting the leaf angle;

[0044] Passive pulley 707: fixed at both ends of shaft 701.

[0045] The two output shafts of the dual-output shaft geared motor 6 are respectively connected to the drive pulley 601 and the traction rope winding pulley 602, wherein:

[0046] Active pulley 601: It forms a 1:1 transmission closed-loop system with passive pulley 707 through polyurethane synchronous belt 8. The inner side of polyurethane synchronous belt 8 is provided with anti-tooth stripping reinforcing ribs and the tooth shape is arc tooth.

[0047] Synchronous transmission technology effect: According to the laser rangefinder, the transmission error on both sides within a 5-meter stroke is ≤±0.5mm, eliminating the linear cumulative error of the traditional rope winding type.

[0048] III. Traction Compensation and Structural Connection

[0049] like Figure 5 As shown, a bottom beam traction rope 503 is threaded through the bottom beam 501, with its two ends wound in opposite spiral directions around the traction rope take-up reel 602, forming a second traction path opposite to the curtain leaf lifting rope 704. Wherein:

[0050] The effect of reverse winding technology: When the louvers are lowered, the active release of the bottom beam traction rope 503 and the synchronous winding of the curtain louver lifting rope 704 generate compensating tension, so that the 40mm wide blades are lowered at a height of 5 meters at a stable speed of 0.2m / s±3%, overcoming the jamming caused by insufficient self-weight.

[0051] Keyway connection structure: The output shaft end of the dual output shaft geared motor 6 is provided with a keyway, and the traction rope winding wheel 602 is interference-fitted with the keyway through a flat key, achieving a torque transmission efficiency of 98.5%.

[0052] IV. Corner Connectors and Modular Assembly

[0053] like Figure 6As shown, the corner connector 4 includes a spacer pin 401 and a corner seat; the corner seat has a horizontal pin 402 and a vertical pin 403 that are perpendicular to each other. The horizontal pin 402 is inserted into the frame of the corresponding top frame 1 or bottom frame 2, and the vertical pin 403 is inserted into the frame of the corresponding side frame 3.

[0054] The spacer pin 401 is fixed to the top surface of the corner seat by screws; the corner seat is provided with a pulley cavity 404, the driving pulley 601 is respectively set in the pulley cavity 404 of the two bottom corner connectors, and the driven pulley 707 is respectively set in the pulley cavity 404 of the two top corner connectors.

[0055] The spacer 120 is horizontally set on the outer side of the frame 110, and its two ends are engaged with the spacer pins 401 of the corner connectors on both sides.

[0056] The working principle is as follows:

[0057] Lifting process: The dual-output shaft reduction motor 6 drives the active pulleys 601a and 601b to rotate synchronously, and drives the passive pulley 707 and the rotating shaft 701 to rotate through the polyurethane synchronous belt 8. The winding drum 703 winds up and unwinds the curtain lifting rope 704 to realize the lifting of the louvers. At the same time, the bottom beam traction rope 503 is released in the opposite direction to provide compensating traction force.

[0058] Tilting process: When the dual-output shaft geared motor 6 reverses, the tilting wheel 705 adjusts the blade angle through the curtain tilting rope 706. The coaxial nested structure isolates the tilting torque from the lifting transmission.

[0059] Storage state: When the blinds are fully retracted, the top of the blind is embedded in the blind storage groove 102, and the bottom beam 501 is retracted into the bottom beam storage groove 202, maintaining an extremely narrow appearance with an overall thickness of 65mm.

[0060] Through the synergistic effect of the above structures, this embodiment achieves technical indicators of clearance deviation rate ≤0.3% and operating vibration amplitude ≤0.1mm under extreme working conditions of 5-meter stroke and 40mm blade width, which is significantly better than the industry standard.

[0061] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A very narrow type of electric louver with dual-axis synchronous belt drive, characterized in that: The window includes a rectangular window frame consisting of a top frame, a bottom frame, and two side frames; glass cover plates glued to both sides of the window frame; and a Venetian blind installed within the window frame. The Venetian blind includes a blind body, a bottom beam, and a bottom beam traction rope passing through the bottom beam. A drive shaft mechanism is provided within the top frame. This drive shaft mechanism includes a horizontally penetrating shaft through the top frame, two winding drums symmetrically fixed in the middle of the shaft, bearing seats supporting both ends of the shaft, a tilting wheel located at the outer end of the winding drum, and driven pulleys located at both ends of the shaft. The winding drum is wound with a slat lifting rope to control the raising and lowering of the blind body, and the tilting wheel is wound with a slat tilting rope to control the angle of the slats. The bottom frame is equipped with a dual-output shaft geared motor, with a drive pulley and a traction rope winding pulley respectively mounted at the ends of the two output shafts. The drive pulley forms a closed-loop synchronous drive system with the corresponding driven pulley through a synchronous belt arranged around the side frame, with a transmission ratio of 1:

1. The two ends of the bottom beam traction rope extend downward and are fixed to the traction rope winding pulleys at both ends of the dual-output shaft geared motor in a spiral winding manner, forming a second synchronous traction path independent of the curtain leaf lifting rope. The winding drum and the turning wheel adopt a coaxial nested structure, and the traction rope winding pulley is rigidly connected to the drive pulley coaxially.

2. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The synchronous belt is a polyurethane synchronous belt with rounded or trapezoidal teeth and anti-loosening reinforcing ribs on its inner side.

3. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The output shaft end of the dual-output-shaft geared motor is provided with a keyway structure, and the traction rope winding reel is connected to the keyway by an interference fit through a flat key.

4. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The winding direction of the bottom beam traction rope is opposite to that of the curtain leaf lifting rope.

5. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The window frame has corner connectors at its four corners. Each corner connector includes a spacer insert and a corner seat. The spacer insert is fixed to the top surface of the corner seat by screws. The corner seat has a pulley cavity inside. The driving pulleys are respectively located in the pulley cavities of the two corner connectors at the bottom of the window frame, and the driven pulleys are respectively located in the pulley cavities of the two corner connectors at the top of the window frame.

6. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 5, characterized in that: The top frame and the bottom frame have the same structure and are arranged symmetrically. The structure includes a frame and a partition. The partition is horizontally arranged on the outer side of the frame, and its two ends are engaged with the partition pins of the corner connectors on both sides.

7. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 5, characterized in that: The corner bracket has horizontal and vertical pins that are perpendicular to each other. The horizontal pins are inserted into the frame of the corresponding top or bottom frame, and the vertical pins are inserted into the frame of the corresponding side frame.

8. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 7, characterized in that: The side frame has a partition cavity, a belt cavity, and a slat side storage groove arranged sequentially from the outside to the inside; the partition cavity contains a molecular sieve; the synchronous belt is placed in the belt cavity, and the two sides of the venetian blind are stored in the slat side storage groove; the vertical pin of the corner seat is inserted into the partition cavity.

9. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The top frame has a drive shaft cavity and a slat storage groove inside; the drive shaft mechanism is located in the drive shaft cavity, the slat storage groove is located at the lower part of the drive shaft cavity, and the two are connected by a wire hole; the top of the Venetian blind is stored in the slat storage groove.

10. The ultra-narrow type electric louver with dual-axis synchronous belt drive as described in claim 1, characterized in that: The bottom frame has a motor cavity and a bottom beam storage groove inside; the dual output shaft reduction motor is located in the motor cavity, and the bottom beam of the venetian blind is stored in the bottom beam storage groove after it is fully unfolded.

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