Electric zebra curtain capable of automatically adjusting light transmittance

Abstract

The utility model discloses an electric zebra curtain capable of automatically adjusting light transmittance, which comprises a control module and a curtain box (1), a reel pipe (2) is arranged in the curtain box (1), one end of the reel pipe (2) is rotatably connected with the curtain box (1), the other end of the reel pipe (2) is provided with a motor (3) fixed with the curtain box (1), the output end of the motor (3) is connected with the reel pipe (2), and curtain cloth (4) is wound on the reel pipe (2). A long hole (5) with the width smaller than 2 mm is formed in the bottom of the curtain box (1), a balance weight shaft (6) is arranged below the long hole (5), the end of the curtain cloth (4) penetrates through the long hole (5), bypasses the balance weight shaft (6) and then penetrates through the long hole (5) to be connected with the inner wall of the curtain box (1), a C-shaped protective sleeve (7) is arranged on the outer side of the balance weight shaft (6), the width of an opening of the protective sleeve (7) is smaller than 2 mm, and end covers (8) are arranged at the two ends of the protective sleeve (7). The utility model has the advantage of larger light transmittance adjusting range.

Description

Technical Field

[0001] This utility model belongs to the field of electric zebra curtains, and particularly relates to an electric zebra curtain that automatically adjusts the light transmission. Background Technology

[0002] Electric zebra blinds are light-blocking devices used on windows. They have two main features: first, they rely on a motor to drive the curtain to rise and fall; second, the curtains have a unique striped design, similar to zebra stripes, forming long strips of light-blocking areas and long strips of light-transmitting areas. The width of the light-blocking area is generally slightly larger than the width of the light-transmitting area, and the light-blocking and light-transmitting areas are arranged alternately in the direction of the curtain's rise and fall.

[0003] The structure of a traditional electric zebra blind includes a curtain box with an inverted U-shaped cross-section. Inside the curtain box is a roller tube, one end of which is rotatably connected to the curtain box, and the other end of which is fitted with a motor fixed to the curtain box. The motor's output is connected to the roller tube, and the curtain fabric is wound around it. The end of the curtain fabric extends downwards, then bends and extends upwards before being fixed to the inner wall of the curtain box on the front side of the roller tube. A counterweight shaft is located at the bend in the curtain fabric, applying a certain gravitational load to the curtain fabric, keeping the detached portion of the fabric slightly tensioned. The working principle of a traditional electric zebra blind is that the motor drives the roller tube to rotate forward and backward, causing the curtain fabric to unwind or rewind on the roller tube, thus changing the area covered by the curtain fabric on the window. The motor's forward, reverse, and stop functions are manually controlled via a switch.

[0004] With technological advancements, electric zebra blinds that can automatically adjust light transmission have been developed based on traditional electric zebra blinds. Their key feature is that, in addition to the traditional electric zebra blind design, the motor integrates a wireless receiving module. For example, the Duya DM25TEQ model has a control module located on the switch panel. This control module is connected to an up button, a down button, a stop button, a wireless transmitting module, and a sensor for detecting indoor light intensity. Both the motor and the switch panel can be purchased from Ningbo Duya Electromechanical Technology Co., Ltd. The specific working principle is that the up, down, and stop buttons send corresponding commands to the control module, which then transmits these commands to the motor via the wireless transmitting and receiving modules, causing the motor to operate accordingly. Automatic light transmission adjustment occurs when the curtain is fully lowered, covering the window and protecting privacy, preventing people at a distance from seeing clearly inside. With the curtain fully lowered, Zebra Curtain automatically adjusts light transmission according to the customer's settings on the control module. The controller, based on the indoor light intensity detected by the sensor, causes the motor to move accordingly, raising or lowering the curtain a short distance. This distance is determined by the width of the shading area. When the indoor brightness is insufficient, raising and lowering the curtain causes the shading areas on both sides of the counterweight shaft to overlap, increasing the light transmission of the Zebra Curtain and thus the indoor brightness. Conversely, when the indoor brightness is too high, raising and lowering the curtain causes the shading areas on both sides of the counterweight shaft to stagger, reducing the light transmission of the Zebra Curtain and thus the indoor brightness.

[0005] Motorized zebra blinds with automatic light transmission adjustment use more components and have a more complex structure than traditional motorized zebra blinds, resulting in a higher price. They also cater to more demanding customers, requiring a wider range of light transmission adjustment. In practical engineering applications, the following issues have been observed: Due to the influence of the counterweight shaft, there is a significant distance between the curtain fabric on both sides of the counterweight shaft at the lower end of the curtain. This distance is determined by the diameter of the counterweight shaft and is generally around 1.5cm. When the curtain is fully wound onto the roller, it forms a large diameter. When the curtain is unwound, the diameter of the curtain winding on the roller decreases, creating a significant distance between the connection end of the curtain to the roller and the connection end of the curtain to the curtain box, also reaching 1.5cm. This results in a large distance between the curtain fabric on both sides of the counterweight shaft when the curtain is lowered to its lowest position, meaning a significant horizontal distance exists between the light-blocking areas of the front and rear layers of curtain. Figure 4 As shown, even if the blackout areas of the two layers of curtains are staggered vertically, light will still pass through the light-transmitting areas of the two layers of curtains through reflection, making it difficult to minimize the minimum light transmittance. The same principle applies to other curtains... Figure 5 As shown, even if the shading areas of the two layers of curtain overlap vertically, due to the sunlight shining obliquely downwards and the angle changing with sunrise and sunset, some of the light passing through the light-transmitting area of ​​the curtain on one side of the counterweight axis will be blocked by the shading area of ​​the curtain on the other side of the counterweight axis, making it difficult for the zebra curtain to have a large maximum light transmittance.

[0006] The existing electric zebra blinds with automatic light transmission adjustment have a large distance between the curtains on both sides of the counterweight shaft, which makes it difficult to achieve a small minimum light transmission and a large maximum light transmission, thus reducing the range of light transmission adjustment. Utility Model Content

[0007] The purpose of this invention is to provide an electrically operated zebra blind that automatically adjusts its light transmittance. This invention has the advantage of a wide range of adjustable light transmittance.

[0008] The technical solution of this utility model is as follows: An electric zebra blind with automatic light transmission adjustment includes a control module and a curtain box. A roller tube is provided inside the curtain box. One end of the roller tube is rotatably connected to the curtain box, and the other end of the roller tube is provided with a motor fixed to the curtain box. The output end of the motor is connected to the roller tube. Curtain fabric is wound on the roller tube. The motor is wirelessly connected to the control module. The bottom of the curtain box is provided with an elongated hole with a width of less than 2mm. A counterweight shaft is provided below the elongated hole. The end of the curtain fabric passes through the elongated hole, around the counterweight shaft, and then through the elongated hole again to connect to the inner wall of the curtain box. A C-shaped protective sleeve is provided on the outside of the counterweight shaft. The opening width of the protective sleeve is less than 2mm. Both ends of the protective sleeve are provided with end caps for connecting to the counterweight shaft.

[0009] In the aforementioned electric zebra blind with automatic light transmission adjustment, a sleeve is provided at the outer edge of the end cap, and the sleeve has a notch for avoiding the curtain fabric. The end of the sheath is tightly fitted into the sleeve, and a pin is provided in the middle of the end cap for rotatably connecting with the counterweight shaft.

[0010] In the aforementioned electric zebra blind with automatic light transmission adjustment, the counterweight shaft is a tubular structure, and the pin is inserted into the inner hole of the counterweight shaft and has a clearance fit with the counterweight shaft.

[0011] In the aforementioned electric zebra blind with automatic light transmission adjustment, the width of the elongated hole is 1.5 mm, and the opening width of the sheath is 1.5 mm.

[0012] In the aforementioned electric zebra blind with automatic light transmission adjustment, the openings on both sides of the sheath are provided with transition rounded corners.

[0013] In the aforementioned electric zebra blind with automatic light transmission adjustment, both sides of the elongated hole are provided with guide plates that are rolled upwards.

[0014] In the aforementioned electric zebra blind with automatic light transmission adjustment, the blind box is provided with a slot, and a card plate passes through the slot. The card plate is fixed to the end of the blind.

[0015] Compared with existing technologies, this invention improves upon existing automatic light-adjusting electric zebra blinds by incorporating a narrow, elongated hole at the bottom of the blind box to reduce the distance between the upper ends of the curtain fabrics on both sides of the counterweight shaft. A small-aperture sleeve is also installed on the outside of the counterweight shaft to further reduce the distance between the lower ends of the curtain fabrics on both sides of the counterweight shaft. This significantly reduces the distance between the two layers of curtain fabrics and the blind box. When the blackout areas of the two layers of curtain fabrics are vertically staggered, light is less likely to pass through the light-transmitting areas of the two layers of curtain fabrics through reflection, resulting in a smaller minimum light transmittance. When the blackout areas of the two layers of curtain fabrics overlap vertically, light passing through the light-transmitting area of ​​the curtain fabric on one side of the counterweight shaft is less likely to be blocked by the blackout area of ​​the curtain fabric on the other side, resulting in a larger maximum light transmittance. Because this invention reduces the minimum light transmittance and increases the maximum light transmittance, it offers a wider range of light transmittance adjustment. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of this utility model.

[0017] Figure 2 This is a schematic diagram of the left-side structure of the end cap.

[0018] Figure 3 This is a schematic diagram of the left-side structure of the curtain box.

[0019] Figure 4 This is a schematic diagram of the light rays when the vertically staggered shading zones of the existing automatically adjustable electric zebra blinds are aligned.

[0020] Figure 5 This is a schematic diagram of the light when the shading areas of the existing automatically adjustable electric zebra blind overlap vertically.

[0021] The markings in the attached diagram are as follows: 1-Curtain box, 2-Roller tube, 3-Motor, 4-Curtain fabric, 5-Elongated hole, 6-Counterweight shaft, 7-Sheath, 8-End cap, 9-Sleeve, 10-Notch, 11-Pin, 12-Rounded corner, 13-Guide plate, 14-Slot, 15-Pattern, 16-Blackout area, 17-Light-transmitting area. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0023] Example: An electrically operated zebra blind that automatically adjusts light transmission, such as... Figure 1As shown, the system includes a control module and a curtain box 1. The curtain box 1 contains a roller tube 2, one end of which is rotatably connected to the curtain box 1. The other end of the roller tube 2 is fixed to the curtain box 1 by a motor 3, which is a Duya DM25TEQ model. The output end of the motor 3 is connected to the roller tube 2, on which a curtain fabric 4 is wound. The motor 3 is wirelessly connected to the control module. The control module is located on the switch panel and includes an up button, a down button, a stop button, a wireless transmitter module, and a sensor for detecting indoor light intensity. The control module is a compatible product for the aforementioned motor 3 and is readily available. The structure of the above-mentioned zebra blind is the same as that of existing automatic light-adjusting electric zebra blinds, and its features are described below:

[0024] The structure of the curtain box 1 has been changed from a U-shaped cross-section to a square cross-section. The bottom of the curtain box 1 has a 1.5mm wide elongated hole 5. On both sides of the wide end of the elongated hole 5 are upwardly curved guide plates 13. Below the elongated hole 5 is a tubular counterweight shaft 6. A C-shaped protective sleeve 7 is provided on the outside of the counterweight shaft 6. The opening width of the protective sleeve 7 is 1.5mm, and both sides of the opening of the protective sleeve 7 have transition rounded corners 12. Both ends of the protective sleeve 7 have end caps 8 that connect to the counterweight shaft 6. The guide plates 13 and the transition rounded corners 12 prevent the curtain fabric from being scratched during raising and lowering.

[0025] The outer edge of the end cap 8 is provided with a sleeve 9, and the sleeve 9 has a notch 10 for avoiding the curtain fabric 4. The end of the sheath 7 is tightly fitted into the sleeve 9. The middle part of the end cap 8 is provided with a pin 11 that is inserted into the inner hole of the counterweight shaft 6, and the pin 11 and the counterweight shaft 6 are clearance-fitted. When the curtain fabric moves, the counterweight shaft 6 can rotate, preventing the curtain fabric from dry rubbing against the counterweight shaft 6 and reducing frictional resistance. With further optimization, the pin 11 and the counterweight shaft 6 can be set as a bearing connection.

[0026] The end of the curtain fabric 4 passes through the elongated hole 5, through the opening of the sheath 7, around the counterweight shaft 6, and then through the elongated hole 5 into the curtain box 1. One of the vertical inner walls of the curtain box 1 is provided with a slot 14, and a card plate 15 is inserted into the slot 14. The card plate 15 is fixed to the end of the curtain fabric 4. The card plate 15 can be made of PET packing straps with a thickness of about 0.8mm.

[0027] The main body of the curtain box is made of aluminum profile cut to size, with end caps for axial sealing. The roller tube and motor 3 are connected to the corresponding end caps, which are injection molded. The sheath 7 and the counterweight shaft 6 are both made of aluminum profile, and the end caps 8 are injection molded. An iron rod can be inserted into the counterweight shaft 6 to increase its weight.

[0028] Compared to existing automatic light-adjusting motorized zebra blinds, the main difference lies in the narrow, elongated hole 5 at the bottom of the curtain box, which limits the distance between the upper ends of the curtain fabric on both sides of the counterweight shaft 6. A narrow-aperture sleeve 7 is also installed on the outside of the counterweight shaft 6, further limiting the distance between the lower ends of the curtain fabric on both sides of the counterweight shaft 6. After these improvements, the distance between the two layers of curtain fabric located between the counterweight shaft 6 and the curtain box 1 is very small. When the light-blocking areas 16 of the two layers of curtain fabric are vertically staggered, light is difficult to pass through the light-transmitting areas of the two layers of curtain fabric through reflection, resulting in a very low minimum light transmittance. When the light-blocking areas 16 of the two layers of curtain fabric overlap vertically, light passing through the light-transmitting area 17 of the curtain fabric on one side of the counterweight shaft is difficult to be blocked by the light-blocking area of ​​the curtain fabric on the other side of the counterweight shaft, thus increasing the maximum light transmittance. Assuming a curtain thickness of 0.5mm, the maximum distance between the curtain fabric on both sides of the counterweight shaft is only 0.5mm.

Claims

1. An electric zebra curtain capable of automatically adjusting the light transmittance, comprising a control module and a curtain box (1), wherein a winding pipe (2) is arranged in the curtain box (1), one end of the winding pipe (2) is rotatably connected with the curtain box (1), the other end of the winding pipe (2) is provided with a motor (3) fixed with the curtain box (1), an output end of the motor (3) is connected with the winding pipe (2), a curtain cloth (4) is wound on the winding pipe (2), and the motor (3) is wirelessly connected with the control module, characterized in that: The bottom of the curtain box (1) is provided with a long hole (5) with a width less than 2mm, and a counterweight shaft (6) is arranged below the long hole (5), the end of the curtain cloth (4) passes through the long hole (5), passes around the counterweight shaft (6), and then passes through the long hole (5) to be connected to the inner wall of the curtain box (1), the outer side of the counterweight shaft (6) is provided with a C-shaped sheath (7), the opening width of the sheath (7) is less than 2mm, and the two ends of the sheath (7) are provided with end covers (8) connected with the counterweight shaft (6). ​ 2. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 1, characterized in that: The outer edge of the end cover (8) is provided with a sleeve (9), the sleeve (9) is provided with a notch (10) for avoiding the curtain cloth (4), the end of the sheath (7) is tightly fitted into the sleeve (9), and the middle of the end cover (8) is provided with a pin shaft (11) rotationally connected with the counterweight shaft (6).

3. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 2, characterized in that: The counterweight shaft (6) is a tubular structure, the pin shaft (11) is inserted into the inner hole of the counterweight shaft (6) and is in clearance fit with the counterweight shaft (6).

4. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 1, characterized in that: The width of the long hole (5) is 1.5mm, and the opening width of the sheath (7) is 1.5mm.

5. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 1, characterized in that: The opening of the sheath (7) is provided with a transition fillet (12) on both sides.

6. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 1, characterized in that: The long hole (5) is provided with a guide plate (13) formed by curling upward on both sides of the width direction.

7. The motorized zebra blind that automatically adjusts the lightness of the light according to claim 1, characterized in that: The curtain box (1) is provided with a clamping groove (14) and a clamping plate (15) arranged in the clamping groove (14), and the end of the curtain cloth (4) is fixed to the clamping plate (15).

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