A control panel overload protection device

Abstract

This utility model belongs to the field of control board overload protection technology, specifically a control board overload protection device, including a housing, a control board installed inside the housing, a current transformer and a logic controller installed on the control board, a speaker installed on the control board, an ambient temperature sensor installed on the control board, two small fans installed on one side of the housing, a heat dissipation duct installed on the other side of the housing, and a circuit breaker fixedly installed on the outer wall of the housing. The ambient temperature sensor detects the temperature around the current transformer in real time, while the current transformer detects the current value in the circuit. If the detected current exceeds a set threshold and the ambient temperature of the logic controller rises sharply, an overload or short circuit occurs. This structure only triggers the operation of the actuator when the temperature rises sharply and the current is large, eliminating the influence of purely high ambient temperature and improving the accuracy of the overload protection device.

Description

Technical Field

[0001] This utility model relates to the field of control board overload protection technology, specifically a control board overload protection device. Background Technology

[0002] The control board is an indispensable part of electronic equipment. It is designed as the mainboard for regulating the coordinated operation of various parts of the system. It can execute and control various operations and commands of the equipment. In order to prevent damage to the internal circuits of the equipment due to excessive current, overload protection devices are required to protect the equipment.

[0003] A Chinese patent with authorization announcement number CN 208272607 U discloses an overload protection device for a circuit control board, comprising a first mounting chamber, a second mounting chamber, a mounting substrate, current transformers, and a fuse. The second mounting chamber is mounted on the top of the mounting substrate. Current transformers are evenly distributed at the bottom of the second mounting chamber. Current detection chips are evenly distributed inside the second mounting chamber at the locations of the current transformers, and the current detection chips correspond to the current transformers. This utility model, composed of a series of structures including the first mounting chamber, the second mounting chamber, the mounting substrate, the current transformers, and the fuse, allows the current transformers to regulate the incoming and outgoing current of the circuit control board, achieving overload protection. The fuse, through a fuse indicator, provides protection by blowing the fuse, preventing the circuit control board from burning out due to unstable current. It is highly practical and worthy of widespread use.

[0004] Existing overload protection devices may be falsely triggered by changes in external temperature during the protection of the control board. Due to the inability to make accurate judgments, the overload protection devices are inaccurate. Therefore, an overload protection device for the control board is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problems existing in the existing technology, this utility model proposes a control board overload protection device.

[0006] The technical solution adopted by this utility model to solve its technical problem is a control board overload protection device, including a housing, a control board installed inside the housing, a current transformer and a logic controller installed on the control board, the current transformer being connected to the logic controller through an internal circuit, a speaker installed on the control board being connected to the logic controller through an internal circuit, an ambient temperature sensor installed on the control board being connected to the logic controller through an internal circuit, two small fans installed on one side of the housing, a mesh screen installed on the outer wall of the housing at the location of the small fans, and a diffuser installed on the other side of the housing. The heat sink has a mesh installed on its inner wall, and a circuit breaker is fixedly installed on the outer wall of the outer casing. The circuit breaker has a first connection terminal and a second connection terminal on its top. The first connection terminal is connected to a current transformer through an internal circuit. The ambient temperature sensor detects the temperature around the current transformer in real time. At the same time, the current transformer detects the current value in the circuit. If the detected current exceeds a set threshold and the ambient temperature of the logic controller rises sharply, it indicates an overload or short circuit. This structure will only trigger the execution component to operate when the temperature rises sharply and the current is large, eliminating the influence of purely high ambient temperature and improving the accuracy of the overload protection device.

[0007] Preferably, the circuit breaker comprises a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing. A push rod is installed within the operating mechanism. An actuating component is fixedly installed on one side of the circuit breaker. The actuating component includes a guide plate with a moving groove. A screw is rotatably mounted on the inner wall of the moving groove, and a knob is installed at one end of the screw. A moving block is assembled within the moving groove, and a moving plate is mounted on the moving block. An mounting plate is mounted on the moving plate, and an electric telescopic rod is fixedly mounted on the mounting plate. A rack is mounted on the actuating rod of the electric telescopic rod, and the rack is slidably connected to the mounting plate. A circular plate is installed on the wall, and a circular ring is rotatably connected to the circular plate. A gear is fixedly fitted on the circular ring, and the gear meshes with a rack. An arc-shaped groove is opened on the circular plate, and an arc-shaped block is assembled in the arc-shaped groove. One side of the arc-shaped block is fixedly connected to the circular ring, and the other end of the arc-shaped block is connected to a limit component. When an overload or short circuit occurs, the logic controller controls the operation of the electric telescopic rod, which drives the limit component to move the push rod downward, thereby disconnecting the circuit. This structure can detect the current and automatically trigger the circuit breaker's disconnection mechanism, which has higher accuracy and faster response speed, and is beneficial to improving the sensitivity of the device.

[0008] The advantages of this utility model are:

[0009] 1. This utility model uses an ambient temperature sensor to detect the temperature around the current transformer in real time. At the same time, the current transformer detects the current value in the circuit. If the detected current exceeds the set threshold and the external temperature of the logic controller rises sharply, it indicates an overload or short circuit. This structure will only trigger the execution component to operate when the temperature rises sharply and the current is large, eliminating the influence of purely high ambient temperature and improving the accuracy of the overload protection device.

[0010] 2. In the event of an overload or short circuit, the logic controller controls the operation of the electric telescopic rod, which drives the limit component to move the push rod downward, thereby disconnecting the circuit. This structure can detect the current and automatically trigger the circuit breaker's disconnection mechanism, resulting in higher accuracy and faster response speed, which is beneficial to improving the sensitivity of the device. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first-person perspective 3D structural diagram;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the control board;

[0014] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the outer shell;

[0015] Figure 4 A schematic diagram of the three-dimensional structure of the execution component;

[0016] Figure 5 This is a schematic diagram of the three-dimensional structure of the limiting component.

[0017] In the diagram: 1. Housing; 2. Control board; 3. Current transformer; 4. Logic controller; 5. Speaker; 6. Small fan; 7. Heat sink; 8. Circuit breaker; 9. First connection terminal; 10. Second connection terminal; 11. Push rod; 12. Guide plate; 13. Moving groove; 14. Screw; 15. Knob; 16. Moving block; 17. Moving plate; 18. Mounting plate; 19. Electric telescopic rod; 20. Rack; 21. Circular plate; 22. Circular ring; 23. Gear; 24. Arc groove; 25. Arc block; 26. Limiting element; 27. Ambient temperature sensor. Detailed Implementation

[0018] 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 scope of protection of the present utility model.

[0019] Please see Figure 1-3 As shown, an overload protection device for a control board includes a housing 1, a control board 2 installed inside the housing 1, a current transformer 3 and a logic controller 4 installed on the control board 2, the current transformer 3 being connected to the logic controller 4 via an internal circuit, a speaker 5 installed on the control board 2, the speaker 5 being connected to the logic controller 4 via an internal circuit, an ambient temperature sensor 27 installed on the control board 2, the ambient temperature sensor 27 being connected to the logic controller 4 via an internal circuit, two small fans 6 installed on one side of the housing 1, and a mesh screen installed on the outer wall of the housing 1 at the location of the small fans 6, a heat dissipation trough 7 installed on the other side of the housing 1, a mesh screen installed on the inner wall of the heat dissipation trough 7, and a circuit breaker 8 fixedly installed on the outer wall of the housing 1. The circuit breaker 8 is equipped with a first connection terminal 9 and a second connection terminal 10. The first connection terminal 9 is connected to the current transformer 3 through an internal circuit. During operation, the existing overload protection device may be falsely triggered by changes in the external temperature while protecting the control board 2. Due to the inability to make accurate judgments, the overload protection device has poor accuracy. The ambient temperature sensor 27, model WG22701, is used to detect the temperature around the current transformer 3 in real time. When the detected temperature is too high, the logic controller 4 controls two small fans 6 to operate, introducing cold air into the outer casing 1 and then exhausting it from the heat sink 7, thus achieving heat dissipation for the current transformer 3.

[0020] The logic controller 4 records the rate of change of external temperature dT / dt. If the temperature rises suddenly, it is determined to be overload; if it rises slowly, it may be due to the influence of ambient temperature.

[0021] Meanwhile, the circuit breaker 8 is model NBH-63H, and the current transformer 3 is model LZZBJ9-10A2. The current transformer 3 detects the current value in the circuit and transmits this information to the logic controller 4. The logic controller 4 receives the current information from the current transformer 3 and compares it with the set overload threshold. If the detected current exceeds the set threshold and the ambient temperature of the logic controller 4 rises sharply, it indicates an overload or short circuit. At this time, the logic controller 4 will send a signal, namely controlling the speaker 5 to turn on to remind personnel, and simultaneously controlling the actuator to operate, causing the push rod 11 on the circuit breaker 8 to move downward, thus disconnecting the circuit inside the circuit breaker 8. This structure only triggers the actuator to operate when the temperature rises sharply and the current is large, eliminating the influence of purely ambient high temperature and improving the accuracy of the overload protection device.

[0022] Please see Figure 4-5 As shown, the circuit breaker 8 consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing. A push rod 11 is installed inside the operating mechanism. An actuating component is fixedly installed on one side of the circuit breaker 8. The actuating component includes a guide plate 12, on which a moving groove 13 is formed. A screw 14 is rotatably installed on the inner wall of the moving groove 13. A knob 15 is installed at one end of the screw 14. A moving block 16 is assembled inside the moving groove 13, and a moving plate 17 is installed on the moving block 16. An mounting plate 18 is installed on the moving plate 17. An electric telescopic rod 19 is fixedly installed on the mounting plate 18. A rack 20 is installed on the actuating rod of the electric telescopic rod 19. The rack 20 is slidably connected to the mounting plate 18. A circular plate 21 is installed on the side wall of the mounting plate 18. A circular ring 22 is rotatably connected to the circular plate 21. A gear 23 is fixedly fitted on the circular ring 22. The gear 23 meshes with the rack 20. An arc-shaped groove 24 is formed on the circular plate 21. An arc-shaped... Block 25, one side of the arc-shaped block 25 is fixedly connected to the ring 22, and the other end of the arc-shaped block 25 is connected to the limit member 26; during operation, the existing overload protection device is difficult to quickly trigger the disconnection mechanism of the circuit breaker 8 in the process of protecting the control board 2, resulting in poor sensitivity of the device. The electric telescopic rod 19 is controlled by the logic controller 4. The rod on the electric telescopic rod 19 drives the rack 20 to move vertically downward. The rack 20 pushes the gear 23 to rotate clockwise. The gear 23 drives the ring 22 to rotate. The ring 22 drives the arc-shaped block 25 to rotate in the arc groove 24. The arc-shaped block 25 drives the limit member 26 to rotate. The limit member 26 drives the push rod 11 to move upward, realizing the connection of the internal circuit of the circuit breaker 8. At this time, the circuit is in the connected state. When an overload or short circuit occurs, the logic controller 4 controls the electric telescopic rod 19 to operate again, driving the limit member 26 to drive the push rod 11 to move downward, realizing the disconnection of the circuit;

[0023] When maintenance is required on the inside of circuit breaker 8, rotating knob 15 drives screw 14 to rotate. Screw 14 drives moving block 16 to move horizontally. Moving block 16 drives moving plate 17 to move horizontally. Moving plate 17 drives mounting plate 18 to move horizontally. Mounting plate 18 drives circular plate 21 to move horizontally. Circular plate 21 drives limiting member 26 on it to move horizontally, moving it away from push rod 11. This achieves convenient separation of push rod 11 and limiting member 26. This structure can detect current and automatically trigger the circuit breaker 8's disconnection mechanism, with higher accuracy and faster response speed, which helps improve the sensitivity of the device.

[0024] Working principle: Existing overload protection devices may be falsely triggered by changes in external temperature during the protection of control board 2. Due to the inability to accurately judge the overload, the accuracy of the overload protection device is poor. The ambient temperature sensor 27 (model WG22701) monitors the temperature around the current transformer 3 in real time. When the detected temperature is too high, the logic controller 4 controls two small fans 6 to operate, drawing cool air into the casing 1 and then exhausting it through the heat sink 7, thus cooling the current transformer 3. The logic controller 4 records the rate of change of the external temperature (dT / dt). A sudden temperature rise is considered an overload, while a slow rise may be due to ambient temperature. Simultaneously, the circuit breaker 8... The current transformer 3, model number LZZBJ9-10A2, is designated NBH-63H. It detects the current value in the circuit and transmits this information to the logic controller 4. The logic controller 4 receives the current information from the current transformer 3 and compares it with a set overload threshold. If the detected current exceeds the set threshold and the ambient temperature of the logic controller 4 rises sharply, it indicates an overload or short circuit. In this case, the logic controller 4 sends a signal, controlling the speaker 5 to turn on to alert personnel. Simultaneously, it controls the actuator to move the push rod 11 on the circuit breaker 8 downwards, breaking the circuit inside the circuit breaker 8. This structure only triggers the actuator when there is a sudden temperature rise and a large current, excluding purely environmental conditions. High temperatures can improve the accuracy of overload protection devices. Existing overload protection devices, while protecting control board 2, struggle to quickly trigger the circuit breaker 8's disconnection mechanism, resulting in poor device sensitivity. The logic controller 4 controls the operation of the electric telescopic rod 19. The lever on the electric telescopic rod 19 drives the rack 20 to move vertically downwards. The rack 20 pushes the gear 23 to rotate clockwise. The gear 23 drives the ring 22 to rotate. The ring 22 drives the arc block 25 to rotate within the arc groove 24. The arc block 25 drives the limiter 26 to rotate. The limiter 26 drives the push rod 11 to move upwards, thus connecting the internal circuit of the circuit breaker 8. At this point, the circuit is in the connected state. When an overload or short circuit occurs, the logic controller... 4. Control the electric telescopic rod 19 to operate again, drive the limiter 26 to move the push rod 11 downward, thus disconnecting the circuit. When it is necessary to perform maintenance on the inside of the circuit breaker 8, turn the knob 15 to drive the screw 14 to rotate. The screw 14 drives the moving block 16 to move horizontally. The moving block 16 drives the moving plate 17 to move horizontally. The moving plate 17 drives the mounting plate 18 to move horizontally. The mounting plate 18 drives the circular plate 21 to move horizontally. The circular plate 21 drives the limiter 26 on it to move horizontally, moving it away from the push rod 11, thus achieving convenient separation of the push rod 11 and the limiter 26. This structure can detect the current and automatically trigger the circuit breaker 8's disconnection mechanism, with higher accuracy and faster response speed, which is beneficial to improving the sensitivity of the device.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A control board overload protection device, characterized in that: The device includes a housing (1), inside which a control board (2) is installed. A current transformer (3) and a logic controller (4) are installed on the control board (2). The current transformer (3) is connected to the logic controller (4) through an internal circuit. A speaker (5) is installed on the control board (2). The speaker (5) is connected to the logic controller (4) through an internal circuit. An ambient temperature sensor (27) is installed on the control board (2). The ambient temperature sensor (27) is connected to the logic controller (4) through an internal circuit. Two small fans (6) are installed on one side of the housing (1). A mesh screen is installed on the outer wall of the housing (1) at the location of the small fans (6). A heat dissipation groove (7) is installed on the other side of the housing (1). A mesh screen is installed on the inner wall of the heat dissipation groove (7). A circuit breaker (8) is fixedly installed on the outer wall of the housing (1). A first connection terminal (9) and a second connection terminal (10) are installed on the top of the circuit breaker (8). The first connection terminal (9) is connected to the current transformer (3) through an internal circuit.

2. The control board overload protection device according to claim 1, characterized in that: The circuit breaker (8) consists of a contact system, an arc extinguishing system, an operating mechanism, a trip unit, and a housing. A push rod (11) is provided inside the operating mechanism.

3. The control board overload protection device according to claim 1, characterized in that: An execution component is fixedly installed on one side of the circuit breaker (8). The execution component includes a guide plate (12). A moving groove (13) is provided on the guide plate (12). A screw (14) is rotatably installed on the inner wall of the moving groove (13). A knob (15) is installed at one end of the screw (14).

4. The control board overload protection device according to claim 3, characterized in that: The movable slot (13) is equipped with a movable block (16), a movable plate (17) is installed on the movable block (16), an installation plate (18) is installed on the movable plate (17), an electric telescopic rod (19) is fixedly installed on the installation plate (18), a rack (20) is installed on the actuating rod of the electric telescopic rod (19), and the rack (20) is slidably connected to the installation plate (18).

5. The control board overload protection device according to claim 4, characterized in that: A circular plate (21) is installed on the side wall of the mounting plate (18). A circular ring (22) is rotatably connected to the circular plate (21). A gear (23) is fixedly sleeved on the circular ring (22). The gear (23) meshes with the rack (20).

6. The control board overload protection device according to claim 5, characterized in that: An arc-shaped groove (24) is provided on the circular plate (21), and an arc-shaped block (25) is assembled in the arc-shaped groove (24). One side of the arc-shaped block (25) is fixedly connected to the ring (22), and the other end of the arc-shaped block (25) is connected to a limiting member (26).

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