A lightning protection structure for a rolling door motor

Abstract

This invention provides a lightning protection structure for a rolling door motor, relating to the field of electric rolling door technology. It includes a motor power supply unit with a drive motor, and comprises a first relay, a second relay, and a third relay. The first normally open switch of the first relay is connected to a first interface on the side of the drive motor closest to the live wire terminal. The second normally open switch of the second relay is connected to a second interface on the side of the drive motor closest to the live wire terminal. The third normally open switch of the third relay is connected to a third interface on the side of the drive motor closest to the neutral wire terminal. This invention features a simple structure using three relays. The first and second relays are located at the live wire terminal of the motor, ensuring lightning protection for both upward and downward movement of the motor. The normally open switch of the third relay is located at the neutral wire terminal of the motor, preventing interference from reversed live and neutral wire connections. This design offers high safety while maintaining low cost.

Description

Technical Field

[0001] This invention relates to the field of electric roller door technology, and in particular, to a lightning protection structure for a roller door motor. Background Technology

[0002] Currently, electric roller shutters and other similar products are widely used in houses, warehouses, shops, etc. Electric roller shutters consist of multiple articulated door panels connected together, with the motor hidden inside the roller tube. The motor drives the drive shaft to rotate, thus raising and lowering the roller shutter panels. When rising, the panels are wound on the roller shaft, and when descending, the panels slide down the inside of the guide rail. The lower end of the roller shutter is secured by a roller shutter lock and a floor lock to protect the valuables inside. The opening and closing of electric doors and windows and roller shutters are controlled by a motor controller above them.

[0003] Electric roller doors require mains power to drive their motors. During heavy thunderstorms, the humid air makes the motor susceptible to lightning strikes. This can cause minor damage to the roller door's circuitry or even serious injury to people near the door. Therefore, lightning protection for electric roller door motors is crucial. Currently, relays are used in the motor circuitry to protect it. For example, Chinese Utility Model Patent CN207553942U discloses a roller door controller with lightning protection, including an MCU, an AC motor, mains power, and an inverter. It also includes a first relay and a second relay. The MCU controls and connects to both the first and second relays. The AC motor is connected to the first relay. The first relay selectively connects to both the mains power and the second relay, while the second relay selectively connects to both the inverter and ground. This design offers advantages such as preventing damage to the inverter from lightning strikes and protecting circuit components.

[0004] However, the above structure only uses two relays for motor protection. Since the motor uses AC power, there is a possibility that the live wire and neutral wire may be reversed. If either is reversed, it will not be able to provide protection during a lightning strike.

[0005] Therefore, a solution has been developed to protect the motor using four relays. The four relays are paired up, with one pair protecting the live wire of the motor and the other pair protecting the neutral wire. However, this approach is too costly. Furthermore, the large number of relays makes wiring at the roller door motor very difficult. Also, the close proximity of the four relay coils poses a risk of lightning strikes damaging adjacent coils.

[0006] In summary, even with two relays for protection, there is still a risk of lightning strikes and leakage when the live and neutral wires are reversed. With four relays for protection, the cost is high and the risk of lightning strikes and breakdowns increases significantly, so the safety is still insufficient.

[0007] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient lightning protection structure for rolling door motors. Summary of the Invention

[0008] The purpose of this invention is to provide a lightning protection structure for a rolling door motor. The structure is simple and uses three relays. The first and second relays are located at the live wire end of the motor to ensure that the motor can be protected against lightning strikes in both upward and downward directions. The normally open switch of the third relay is located at the neutral wire end of the motor, so that it is not affected by the reverse connection of the live and neutral wires. It is low in cost and high in safety.

[0009] To achieve the above objectives, the present invention employs the following technical solution:

[0010] A lightning protection structure for a rolling door motor includes a motor power supply unit, which is equipped with a drive motor. The power supply unit also includes a first relay, a second relay, and a third relay. The first relay has a first normally open switch, the second relay has a second normally open switch, and the third relay has a third normally open switch. The first normally open switch is connected to a first interface on the side of the drive motor closest to the live wire terminal. The second normally open switch is connected to a second interface on the side of the drive motor closest to the live wire terminal. The ends of the first and second normally open switches near the drive motor are connected via a voltage stabilizing capacitor. The third normally open switch is connected to a third interface on the side of the drive motor closest to the neutral wire terminal.

[0011] As a preferred embodiment of the present invention, it further includes a motor control unit, which is provided with a first operating switch, a second operating switch and a stop switch, wherein the stop switch is a normally closed switch and the first operating switch and the second operating switch are both normally open switches; the first operating switch and the second operating switch are connected to the live wire terminal and the stop switch is connected to the neutral wire terminal.

[0012] As a preferred embodiment of the present invention, the first relay is provided with a first normally closed switch, the second relay is provided with a second normally closed switch, the first normally closed switch and the second running switch are connected in series to form a first circuit, the second normally closed switch and the first running switch are connected in series to form a second circuit, and the first circuit and the second circuit are connected in parallel and then connected in series with the stop switch.

[0013] As a preferred embodiment of the present invention, the first relay is provided with a first induction coil, which is connected in series between the second normally closed switch and the first operating switch; the second relay is provided with a second induction coil, which is connected in series between the first normally closed switch and the second operating switch.

[0014] As a preferred embodiment of the present invention, the third relay is provided with a third induction coil, which is connected in series on the side of the stop switch away from the first running switch.

[0015] As a preferred embodiment of the present invention, the motor power supply unit is provided with a bridge rectifier and a brake coil, and the bridge rectifier and the brake coil are disposed between the third normally open switch and the drive motor.

[0016] As a preferred embodiment of the present invention, a temperature sensing switch is provided at the drive motor, and the temperature sensing switch is a normally closed switch.

[0017] As a preferred embodiment of the present invention, both the first relay and the second relay are solid-state relays.

[0018] The beneficial effects of the lightning protection structure for a rolling door motor of the present invention are as follows: the structure is simple, and it adopts a structure of three relays. The first and second relays are located at the live wire end of the motor to ensure that the motor can be protected against lightning strikes in both upward and downward directions. The normally open switch of the third relay is located at the neutral wire end of the motor, so that it is not affected by the reverse connection of the live and neutral wires. It is low in cost and high in safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the lightning protection structure for a rolling door motor according to the present invention;

[0020] In the diagram: M, drive motor; L, live wire terminal; N, neutral wire terminal; J1-0, first induction coil; J1-1, first normally open switch; J1-2, first normally closed switch; J2-0, second induction coil; J2-1, second normally open switch; J1-2, second normally closed switch; J3-0, third induction coil; J3-1, third normally open switch; C, voltage stabilizing capacitor; K1, first running switch; K2, second running switch; K3, stop switch; Q, bridge rectifier; RT, brake coil; K4, temperature sensing switch. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and steps of the modules and steps set forth in these embodiments do not limit the scope of the invention.

[0023] At the same time, it should be understood that, for ease of description, the process shown in the attached diagram is not performed in isolation, but rather involves multiple steps that overlap.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0026] Techniques, methods, and systems known to a person skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the license specification.

[0027] Example 1: As Figure 1 The diagram shown is merely one embodiment of the present invention. A lightning protection structure for a rolling door motor includes a motor power supply unit, which is equipped with a drive motor M and includes a first relay, a second relay, and a third relay. The first relay is equipped with a first normally open switch J1-1, the second relay is equipped with a second normally open switch J2-1, and the third relay is equipped with a third normally open switch J3-1. The first normally open switch J1-1 is connected to a first interface on the side of the drive motor M near the live wire terminal L. The second normally open switch J2-1 is connected to a second interface on the side of the drive motor M near the live wire terminal L. The ends of the first normally open switch J1-1 and the second normally open switch J2-1 near the drive motor M are connected through a voltage stabilizing capacitor C. The third normally open switch J3-1 is connected to a third interface on the side of the drive motor M near the neutral wire terminal N.

[0028] In this invention, a first normally open switch J1-1 of the first relay and a second normally open switch J2-1 of the second relay are installed near the live wire end of the drive motor M. These are used to protect the motor when it rotates forward and reverses (when the rolling door moves up and down). A third normally open switch J1-1 of the third relay is installed near the neutral wire end of the drive motor M. If the live wire and neutral wire of the entire circuit are reversed, and the neutral wire end is connected to the live wire, the third normally open switch J1-1 will provide protection.

[0029] This way, only three relays are needed to complete the protection during positive connection (live wire to live wire) and reverse connection (neutral wire to live wire), as well as the protection during the upward and downward movement of the rolling door.

[0030] As an embodiment of the present invention, a lightning protection structure for a rolling door motor further includes a motor control unit. The motor control unit is provided with a first operating switch K1, a second operating switch K2, and a stop switch K3. The stop switch K3 is a normally closed switch, and the first operating switch K1 and the second operating switch K2 are both normally open switches. The first operating switch K1 and the second operating switch K2 are connected to the live wire terminal L, and the stop switch K3 is connected to the neutral wire terminal N.

[0031] When the first operating switch K1 is closed, the roller door moves upward; when the second operating switch K2 is closed, the roller door moves downward; when the stop switch K3 is open, the roller door stops in an emergency.

[0032] It should be noted that K1 actually consists of three switches connected in parallel: a manual up switch, a remote control up switch, and an additional normally open switch of the second relay. When any one of these switches is closed, the roller door moves upward. Similarly, K2 also consists of three switches connected in parallel: a manual down switch, a remote control down switch, and an additional normally open switch of the first relay. When any one of these switches is closed, the roller door moves downward. K3 is also composed of two switches connected in series: a manual emergency stop switch and a remote control emergency stop switch. When either of these switches is open, the roller door stops abruptly.

[0033] Here, the first relay is equipped with a first normally closed switch J1-2, and the second relay is equipped with a second normally closed switch J2-2. The first normally closed switch J1-2 and the second running switch K2 are connected in series to form a first circuit. The second normally closed switch J2-2 and the first running switch K1 are connected in series to form a second circuit. The first circuit and the second circuit are connected in parallel and then connected in series with the stop switch K3.

[0034] Furthermore, the first relay is provided with a first induction coil J1-0, which is connected in series between the second normally closed switch J2-2 and the first running switch K1. The second relay is provided with a second induction coil J2-0, which is connected in series between the first normally closed switch J1-2 and the second running switch K2.

[0035] Finally, the third relay is provided with a third induction coil J3-0, which is connected in series with the stop switch K3 on the side away from the first running switch K1.

[0036] Example 2, still as Figure 1As shown, this is only one embodiment of the present invention. Based on the first embodiment, in the lightning protection structure of the rolling door motor of the present invention, the motor power supply unit is provided with a bridge rectifier Q and a brake coil RT, and the bridge rectifier Q and the brake coil RT are disposed between the third normally open switch J3-1 and the drive motor M.

[0037] Furthermore, a temperature sensing switch K4 is provided at the drive motor M, and the temperature sensing switch K4 is a normally closed switch.

[0038] Finally, both the first and second relays are solid-state relays.

[0039] This invention discloses a lightning protection structure for a rolling door motor. The structure is simple and uses three relays. The first and second relays are located at the live wire end of the motor to ensure lightning protection for both upward and downward movement of the motor. The normally open switch of the third relay is located at the neutral wire end of the motor, so that it is not affected by the reverse connection of the live and neutral wires. It is low in cost and high in safety.

[0040] This invention is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this invention should be included within the scope of protection of this invention.

Claims

1. A lightning protection structure for a rolling door motor, comprising a motor power supply unit, wherein the motor power supply unit is equipped with a drive motor (M), characterized in that: The system includes a first relay, a second relay, and a third relay. The first relay is equipped with a first normally open switch (J1-1), the second relay is equipped with a second normally open switch (J2-1), and the third relay is equipped with a third normally open switch (J3-1). The first normally open switch (J1-1) is connected to a first interface on the side of the drive motor (M) near the live wire terminal (L). The second normally open switch (J2-1) is connected to a second interface on the side of the drive motor (M) near the live wire terminal (L). The end of the first normally open switch (J1-1) near the drive motor (M) and the end of the second normally open switch (J2-1) near the drive motor (M) are connected through a voltage stabilizing capacitor (C). The third normally open switch (J3-1) is connected to a third interface on the side of the drive motor (M) near the neutral wire terminal (N).

2. The lightning protection structure for a rolling door motor according to claim 1, characterized in that: It also includes a motor control unit, which is provided with a first operating switch (K1), a second operating switch (K2) and a stop switch (K3). The stop switch (K3) is a normally closed switch, and the first operating switch (K1) and the second operating switch (K2) are both normally open switches. The first operating switch (K1) and the second operating switch (K2) are connected to the live wire terminal (L), and the stop switch (K3) is connected to the neutral wire terminal (N).

3. The lightning protection structure for a rolling door motor according to claim 2, characterized in that: The first relay is equipped with a first normally closed switch (J1-2), and the second relay is equipped with a second normally closed switch (J2-2). The first normally closed switch (J1-2) and the second running switch (K2) are connected in series to form a first circuit, and the second normally closed switch (J2-2) and the first running switch (K1) are connected in series to form a second circuit. The first circuit and the second circuit are connected in parallel and then connected in series with the stop switch (K3).

4. The lightning protection structure for a rolling door motor according to claim 3, characterized in that: The first relay is provided with a first induction coil (J1-0), which is connected in series between the second normally closed switch (J2-2) and the first running switch (K1). The second relay is provided with a second induction coil (J2-0), which is connected in series between the first normally closed switch (J1-2) and the second running switch (K2).

5. The lightning protection structure for a rolling door motor according to claim 3, characterized in that: The third relay is equipped with a third induction coil (J3-0), which is connected in series on the side of the stop switch (K3) away from the first run switch (K1).

6. The lightning protection structure for a rolling door motor according to claim 1, characterized in that: The motor power supply unit is equipped with a bridge rectifier (Q) and a brake coil (RT), and the bridge rectifier (Q) and the brake coil (RT) are located between the third normally open switch (J3-1) and the drive motor (M).

7. The lightning protection structure for a rolling door motor according to claim 1, characterized in that: A temperature sensing switch (K4) is provided at the drive motor (M), and the temperature sensing switch (K4) is a normally closed switch.

8. The lightning protection structure for a rolling door motor according to claim 1, characterized in that: Both the first relay and the second relay are solid-state relays.

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