Distribution box with anti-overheating monitoring function
By introducing a temperature sensor and a servo motor-driven sealing component into the distribution box, combined with the reaction chamber and the stirring component, the automatic fire extinguishing problem of the distribution box when overheating is solved, and the heat dissipation effect is adjusted and safety is improved.
Patent Information
- Application Number
- CN202510876593.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-08
AI Technical Summary
The existing distribution box cannot automatically and efficiently extinguish the fire when the internal temperature is too high, which poses a safety hazard.
A sealing component with temperature sensor and servo motor drive is designed to adjust the heat dissipation holes through the movable shutter and filter plate, and combine the reaction chamber, liquid storage chamber and stirring assembly to achieve automatic fire extinguishing.
The heat dissipation effect is adjusted and automatic fire extinguishing is achieved to ensure the safety and effectiveness of the distribution box when overheating is achieved.
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Figure CN120453907A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of distribution boxes, in particular to a distribution box with an anti-overheating monitoring function. Background Art
[0002] In modern power systems, distribution boxes, as key equipment for power distribution and control, are widely used in various fields such as industry, commerce, and residences. A variety of power controllers are installed inside them to command various components in the power supply line to reasonably distribute electrical energy. Therefore, during their long-term operation, a large amount of heat is easily generated inside.
[0003] The prior art (publication number: CN118825791A, Chinese patent publication date: 2024-10-22) discloses an overheating warning safety protection distribution box, which belongs to the technical field of distribution boxes and includes a box body, a heat dissipation component is installed inside the box, a box door is installed on the side of the box body, and a filter component is provided on the side of the air vent of the box door. By arranging the filter component, the fixing rod and the fixing part are tightly plugged together under the pulling force of the tension spring, and the dust filter plate is fixedly installed inside the pipe to intercept dust and prevent dust from entering the box, so as to make the use effect of the overheating warning safety protection distribution box better; by arranging an auxiliary component, pulling the pull rod can drive the lifting block to move up, and the bristles on the surface of the lifting block can sweep the dust on the surface of the dust filter plate during the movement, so that dust cleaning is more convenient; by arranging the heat dissipation component, the motor can control the three fan blades to rotate and supply air, so as to discharge the heat inside the box and achieve better heat dissipation and cooling effect of the device; The prior art (Announcement No.: CN214044576U, Chinese patent publication date: 2021-08-24) discloses an overheating protection structure for a distribution box, which belongs to the technical field of distribution boxes. The overheating protection structure of the distribution box includes an overheating protection component and a dustproof component, the overheating protection component includes a box body, a heat dissipation fan and a heat dissipation fin, two heat dissipation fans are provided, and the two heat dissipation fans are symmetrically arranged in the box body, and the heat dissipation fins are spaced and arranged through the bottom of the box body, the dustproof component includes a dustproof net, a sliding rod, a spring and a card plate, a heat dissipation port is provided on one side of the box body, the dustproof net is adapted to the heat dissipation port, and the heat dissipation port is connected to a sliding hole and a groove, the sliding rod is slidably arranged in the sliding hole, the sliding rod is sleeved with a limiting ring, and the spring is sleeved on the surface of the sliding rod. The coordinated use of the sliding rod, the spring and the card plate facilitates the installation and removal of the dustproof net, thereby facilitating replacement and cleaning to ensure heat dissipation effect and avoid damage to internal components caused by overheating; Although the existing distribution box can improve heat dissipation by cleaning the heat dissipation port, it is inconvenient to automatically and efficiently extinguish the fire when the temperature inside the box is too high and a fire occurs, which limits the safety of the box and has certain usage defects. Summary of the Invention
[0004] The purpose of the present invention is to provide a distribution box with an anti-overheating monitoring function to solve the problem raised in the above background technology that the distribution boxes on the current market are inconvenient to automatically and efficiently extinguish fires when the temperature inside the box is too high and a fire occurs.
[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a distribution box with an anti-overheating monitoring function, comprising a box body, heat dissipation holes evenly opened on both sides of the box body, a servo motor fixedly mounted on the top of the box body, and a temperature sensor for monitoring the operating temperature installed on the inside of the box body; The inner wall of the box is equipped with a blocking component for adjusting the effective area of the heat dissipation hole, the outer wall of the box is fixedly equipped with a mounting frame, and a movable filter plate is slidably mounted on the inner side of the mounting frame, a reaction chamber is fixedly mounted on the inner side of the top of the box, and a movable plate is slidably and lifted on the inner side of the reaction chamber, and a puncture piece is fixedly mounted on the center top of the movable plate, a liquid storage tank is fixedly mounted on the inner side of the reaction chamber, a liquid bag is provided on the inner side of the liquid storage tank, and a through hole is opened on the lower surface of the reaction chamber, a stirring component for improving the reaction efficiency is provided on the inner side of the box, and a gas supply component for fire extinguishing is installed on the outer side of the box.
[0006] Preferably, the blocking assembly includes a guide column fixedly mounted on the inner wall of the box, and a movable baffle is installed on the outer side of the guide column for lifting and sliding, and a first spring is connected between the movable baffle and the guide column, and at the same time, a first pull rope is fixedly connected to the top of the movable baffle, and the upper end of the first spring is connected to the outer side of a winding wheel connected to the output end of the servo motor, and the servo motor controls the winding wheel to reel in the first pull rope to drive the movable baffle to move up.
[0007] Preferably, the movable shutter is attached to the inner wall of the box body, and the positions of the movable shutter and the heat dissipation holes are correspondingly arranged, and the heat dissipation holes are gradually blocked during the upward movement of the movable shutter.
[0008] Preferably, the blocking assembly further comprises a magnetic sheet embedded in the surface of the movable shutter, and a second spring is fixedly connected between the mounting frame and the movable filter plate, and the movable filter plate is made of magnetic material, and the magnetic poles of the opposite surfaces of the movable filter plate and the magnetic sheet are opposite.
[0009] Preferably, a third spring is fixedly connected between the upper inner wall of the reaction chamber and the movable plate, a second pull rope is fixedly connected to the upper end of the movable plate, and a connecting ring is fixedly connected to the upper end of the second pull rope, and the connecting ring is sleeved on the outside of the first pull rope, and the first pull rope bends under the tension of the second pull rope.
[0010] Preferably, when the movable shield moves upward to the highest point, the first pull rope pulls the second pull rope through the connecting ring to move upward, and when the second pull rope drives the movable plate to move upward, the puncture member penetrates the through hole of the reaction chamber and punctures the liquid capsule.
[0011] Preferably, the inner side of the reaction chamber is filled with calcium carbonate, and the liquid capsule is made of corrosion-resistant elastic material, and the inner side of the liquid capsule is filled with dilute hydrochloric acid. At the same time, the gas transmission component includes an exhaust pipe rotatably installed on the outside of the reaction chamber, and air holes are evenly opened on the exhaust pipe. An air guide pipe is installed at the upper end of the exhaust pipe, and the air guide pipe is connected to the reaction chamber.
[0012] Preferably, the exhaust pipe and the air guide pipe are rotatably connected, and the exhaust pipe and the reaction chamber are elastically rotatably connected, and a third pull rope is wrapped around the outside of the exhaust pipe, and the upper end of the third pull rope is fixedly connected to the lower surface of the movable plate.
[0013] Preferably, the stirring assembly includes a stirring rod elastically rotatably mounted on the inner side of the reaction chamber, and a guide groove with a spiral structure is provided on the upper part of the shaft end of the stirring rod, and the upper part of the shaft end of the stirring rod passes through the movable plate, and at the same time, a ball is embedded in the inner wall of the through hole on the movable plate, and the ball rolls along the guide groove, and the stirring rod is driven to rotate by the ball during the lifting and lowering process of the movable plate.
[0014] Compared with the existing technology, the beneficial effects of the present invention are: the distribution box with anti-overheating monitoring function can conveniently adjust the heat dissipation port, and can automatically clean the filter during the adjustment process to ensure the heat dissipation effect, and can also automatically extinguish the fire in the event of overheating. The specific contents are as follows; A movable shutter and a movable filter plate are provided. As the servo motor drives the winding wheel to rotate, the winding wheel can reel in the first pull rope, so that the first pull rope pulls the movable shutter to elastically adjust the lifting and lowering, so that the movable shutter adjusts and covers the heat dissipation hole, thereby achieving the adjustment of the heat dissipation effect of the box; Furthermore, as the movable shield moves, the magnetic sheet on it will move to the heat dissipation hole, so that the movable filter plate will elastically slide along the inner side of the mounting frame under the action of the magnetic force. When the magnetic sheet is away from the heat dissipation hole, the movable filter plate will lose the magnetic effect and achieve elastic shaking, thereby achieving the outer side of the movable filter plate.
[0015] 2. A reaction chamber, a movable plate and a liquid storage tank are provided. When the movable plate cannot be moved upward, the winding wheel at the output end of the servo motor continues to wind the first pull rope, so that the bending part of the first pull rope gradually becomes straight, thereby pulling the second pull rope through the connecting ring, and then driving the movable plate to drive the puncture piece to move upward to puncture the liquid bag in the liquid storage tank, so that hydrochloric acid flows into the reaction chamber and reacts with calcium carbonate, thereby generating a large amount of carbon dioxide, which is evenly discharged through the exhaust pipe and quickly fills the interior of the box, realizing automatic fire extinguishing.
[0016] 3. A movable plate and a stirring rod are provided. As the movable plate rises and falls back and forth, the balls on the movable plate can roll along the guide grooves on the stirring rod, thereby driving the stirring rod to rotate back and forth, so that the stirring rod can stir the reagents in the reaction chamber, thereby improving the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the reaction chamber and the exhaust pipe of the present invention; Figure 3 This is a schematic diagram of the installation structure of the movable shutter of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the movable shutter of the present invention; Figure 5 For the present invention Figure 4 A in the middle is an enlarged structural diagram; Figure 6 This is a schematic diagram of the cross-sectional structure of the reaction chamber of the present invention; Figure 7 This is a schematic diagram of the connection structure between the movable plate and the stirring rod of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B in the middle.
[0018] In the figure: 1. Box body; 2. Heat dissipation hole; 3. Servo motor; 4. Guide column; 5. Movable shutter; 6. First spring; 7. First pull rope; 8. Mounting frame; 9. Movable filter plate; 10. Second spring; 11. Magnetic sheet; 12. Reaction chamber; 13. Movable plate; 14. Third spring; 15. Connecting ring; 16. Second pull rope; 17. Liquid storage tank; 18. Piercing piece; 19. Stirring rod; 20. Guide groove; 21. Ball; 22. Exhaust pipe; 23. Air guide pipe; 24. Third pull rope. DETAILED DESCRIPTION
[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0020] Example 1: The existing distribution box is inconvenient to adjust the heat dissipation effect and automatically clean the filtered dust, etc. In order to solve this technical problem, this embodiment discloses the following technical content, please refer to Figure 1-Figure 5As shown; a distribution box with an anti-overheating monitoring function, including a box body 1, heat dissipation holes 2 are evenly opened on both sides of the box body 1, a servo motor 3 is fixedly installed on the top of the box body 1, and a temperature sensor for monitoring the working temperature is installed on the inside of the box body 1.
[0021] The inner wall of the box body 1 is installed with a blocking component for adjusting the effective area of the heat dissipation hole 2. The outer wall of the box body 1 is fixedly installed with a mounting frame 8, and the inner side of the mounting frame 8 is slidably installed with a movable filter plate 9. The blocking assembly includes a guide column 4 fixedly mounted on the inner wall of the box body 1, and a movable shutter 5 is installed on the outer side of the guide column 4 for lifting and sliding, and a first spring 6 is connected between the movable shutter 5 and the guide column 4, and at the same time, a first pull rope 7 is fixedly connected to the top of the movable shutter 5, and the upper end of the first spring 6 is connected to the outer side of the winding wheel connected to the output end of the servo motor 3, and the servo motor 3 controls the winding wheel to reel in the first pull rope 7 to drive the movable shutter 5 to move upward, and the movable shutter 5 is attached to the inner wall of the box body 1, and the positions of the movable shutter 5 and the heat dissipation hole 2 are correspondingly set, and the heat dissipation hole 2 is gradually blocked during the upward movement of the movable shutter 5, and the blocking assembly also includes a magnetic sheet 11 embedded in the surface of the movable shutter 5, and a second spring 10 is fixedly connected between the mounting frame 8 and the movable filter plate 9, and the movable filter plate 9 is a magnetic material, and the magnetic poles of the opposite surfaces of the movable filter plate 9 and the magnetic sheet 11 are opposite.
[0022] The temperature sensor can monitor the temperature inside the box 1 in real time. When the temperature inside the box 1 changes, the servo motor 3 is started, so that the winding wheel at the output end of the servo motor 3 can reel or unreel the first pull rope 7, so that the first pull rope 7 pulls the movable shutter 5 to elastically move and adjust on the outside of the guide column 4. At this time, the movable shutter 5 can economically adjust the blocking area of the heat dissipation hole 2, thereby achieving the adjustment of the heat dissipation effect. When the magnetic piece 11 on the movable shutter 5 is close to the heat dissipation hole 2, the movable filter plate 9 will elastically move on the inside of the mounting frame 8 under the action of the magnetic force, and when the magnetic piece 11 is away from the heat dissipation hole 2, the movable filter plate 9 will elastically reset, thereby shaking off the dust on the outside of the movable filter plate 9 through vibration, ensuring the ventilation effect of the movable filter plate 9 and the heat dissipation effect of the box 1.
[0023] Example 2: The technical content disclosed in this embodiment is a further improvement based on the above-mentioned Example 1. The existing distribution box cannot automatically and effectively extinguish the fire when the internal overheating occurs and the fire occurs, and the safety of use is limited. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 2 and Figure 6-Figure 8As shown; a reaction chamber 12 is fixedly installed on the inner side of the top of the box body 1, and a movable plate 13 is slidably and liftably installed on the inner side of the reaction chamber 12, and a puncture piece 18 is fixedly installed on the center top of the movable plate 13, a liquid storage tank 17 is fixedly installed on the inner side of the reaction chamber 12, and a liquid bag is provided on the inner side of the liquid storage tank 17, and a through hole is opened on the lower surface of the reaction chamber 12, a stirring assembly for improving the reaction efficiency is provided on the inner side of the box body 1, and a gas supply assembly for fire extinguishing is installed on the outer side of the box body 1. A third spring 14 is fixedly connected between the upper inner wall of the reaction chamber 12 and the movable plate 13, a second pull rope 16 is fixedly connected to the upper end of the movable plate 13, and a connecting ring 15 is fixedly connected to the upper end of the second pull rope 16, and the connecting ring 15 is sleeved on the outside of the first pull rope 7, and the first pull rope 7 is bent under the tension of the second pull rope 16. When the movable shutter 5 moves up to the highest point, the first pull rope 7 pulls the second pull rope 16 upward through the connecting ring 15, and when the second pull rope 16 drives the movable plate 13 to move up, the puncture member 18 penetrates the through hole of the reaction chamber 12 and punctures the liquid capsule. The inside of the reaction chamber 12 is filled with calcium carbonate, and the liquid capsule is made of corrosion-resistant elastic material, and the inside of the liquid capsule is filled with dilute hydrochloric acid. At the same time, the gas supply component includes an exhaust pipe 22 rotatably installed on the outside of the reaction chamber 12, and the exhaust pipe 22 Air holes are evenly opened on the top, and an air guide pipe 23 is installed at the upper end of the exhaust pipe 22, and the air guide pipe 23 is communicated with the reaction chamber 12, the exhaust pipe 22 and the air guide pipe 23 are rotatably connected, and the exhaust pipe 22 and the reaction chamber 12 are elastically rotatably connected, and a third pull rope 24 is wrapped around the outside of the exhaust pipe 22, and the upper end of the third pull rope 24 is fixedly connected to the lower surface of the movable plate 13, the stirring assembly includes a stirring rod 19 elastically rotatably installed on the inner side of the reaction chamber 12, and a spiral guide groove 20 is opened on the upper part of the axial end of the stirring rod 19, and the upper part of the axial end of the stirring rod 19 passes through the movable plate 13, and a ball 21 is embedded in the inner wall of the through hole on the movable plate 13, and the ball 21 rolls along the guide groove 20. During the lifting and lowering process of the movable plate 13, the stirring rod 19 is driven to rotate by the ball 21.
[0024] When the inside of the box body 1 overheats and catches fire, the servo motor 3 is controlled to drive the movable shutter 5 to move up, so as to block the heat dissipation hole 2. When the movable shutter 5 cannot move up, the servo motor 3 continues to control the winding wheel to reel in the first pull rope 7, so that the bending part of the first pull rope 7 gradually becomes straight, so that the first pull rope 7 pulls the second pull rope 16 through the connecting ring 15. At this time, the second pull rope 16 will drive the movable plate 13 to move up synchronously and elastically on the inside of the reaction chamber 12, so that the piercing member 18 on the top of the movable plate 13 penetrates the through hole of the liquid storage tank 17 and punctures the liquid capsule, so that the dilute hydrochloric acid inside it flows into the reaction chamber 12, thereby reacting with the calcium carbonate in the reaction chamber 12. The reaction generates a large amount of carbon dioxide, which allows the carbon dioxide gas to enter the exhaust pipe 22 through the air guide pipe 23. At the same time, the servo motor 3 is controlled to drive the winding wheel to rotate back and forth, so that the movable plate 13 pulls the exhaust pipe 22 through the third pull rope 24 to rotate back and forth elastically, so that the exhaust pipe 22 can quickly fill the carbon dioxide into the inner side of the box body 1, thereby realizing rapid fire extinguishing. At the same time, when the movable plate 13 is reciprocated and lifted, the ball 21 thereon can be driven to roll along the spiral guide groove 20, thereby driving the stirring rod 19 to rotate back and forth, thereby realizing uniform stirring of the reagents in the reaction chamber 12, effectively improving the reaction effect, and ensuring the fire extinguishing effect.
[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.
Claims
1. A distribution box with an anti-overheating monitoring function, comprising a box body (1), heat dissipation holes (2) are evenly opened on both sides of the box body (1), a servo motor (3) is fixedly installed on the top of the box body (1), and a temperature sensor for monitoring the working temperature is installed on the inner side of the box body (1); It is characterized by: The inner wall of the box body (1) is installed with a blocking component for adjusting the effective area of the heat dissipation hole (2), the outer wall of the box body (1) is fixedly installed with a mounting frame (8), and the inner side of the mounting frame (8) is slidably installed with a movable filter plate (9), the top inner side of the box body (1) is fixedly installed with a reaction chamber (12), and the inner side of the reaction chamber (12) is slidably installed with a movable plate (13), and the center top of the movable plate (13) is fixedly installed with a puncture piece (18), the inner side of the reaction chamber (12) is fixedly installed with a liquid storage tank (17), and the inner side of the liquid storage tank (17) is provided with a liquid bag, and the lower surface of the reaction chamber (12) is provided with a through hole, the inner side of the box body (1) is provided with a stirring component for improving the reaction efficiency, and the outer side of the box body (1) is provided with a gas supply component for extinguishing fire.
2. The distribution box with overheating protection monitoring function according to claim 1, characterized in that: The blocking assembly includes a guide column (4) fixedly mounted on the inner wall of the box body (1), and a movable baffle (5) is mounted on the outer side of the guide column (4) in a lifting and sliding manner, and a first spring (6) is connected between the movable baffle (5) and the guide column (4), and a first pull rope (7) is fixedly connected to the top of the movable baffle (5), and the upper end of the first spring (6) is connected to the outer side of a winding wheel connected to the output end of the servo motor (3), and the servo motor (3) controls the winding wheel to reel in the first pull rope (7) to drive the movable baffle (5) to move upward.
3. The distribution box with overheating protection monitoring function according to claim 2, characterized in that: The movable shield (5) is fitted to the inner wall of the box body (1), and the positions of the movable shield (5) and the heat dissipation holes (2) are correspondingly arranged, and the heat dissipation holes (2) are gradually blocked during the upward movement of the movable shield (5).
4. The distribution box with overheating protection monitoring function according to claim 1, characterized in that: The blocking assembly further includes a magnetic sheet (11) embedded in the surface of the movable shield (5), and a second spring (10) is fixedly connected between the mounting frame (8) and the movable filter plate (9), and the movable filter plate (9) is made of magnetic material, and the magnetic poles of the opposite surfaces of the movable filter plate (9) and the magnetic sheet (11) are opposite.
5. The distribution box with overheating protection monitoring function according to claim 1, characterized in that: A third spring (14) is fixedly connected between the inner wall of the upper end of the reaction chamber (12) and the movable plate (13), a second pull rope (16) is fixedly connected to the upper end of the movable plate (13), and a connecting ring (15) is fixedly connected to the upper end of the second pull rope (16), and the connecting ring (15) is sleeved on the outside of the first pull rope (7), and the first pull rope (7) is bent under the tension of the second pull rope (16).
6. The distribution box with overheating protection monitoring function according to claim 2, characterized in that: When the movable shield (5) moves upward to the highest point, the first pull rope (7) pulls the second pull rope (16) through the connecting ring (15) to move upward, and when the second pull rope (16) drives the movable plate (13) to move upward, the puncture member (18) penetrates the through hole of the reaction chamber (12) and punctures the liquid capsule.
7. The distribution box with overheating protection monitoring function according to claim 6, characterized in that: The inner side of the reaction chamber (12) is filled with calcium carbonate, and the liquid capsule is made of a corrosion-resistant elastic material, and the inner side of the liquid capsule is filled with dilute hydrochloric acid. At the same time, the gas transmission component includes an exhaust pipe (22) rotatably mounted on the outer side of the reaction chamber (12), and the exhaust pipe (22) is evenly provided with air holes. The upper end of the exhaust pipe (22) is installed with an air guide pipe (23), and the air guide pipe (23) is connected to the reaction chamber (12).
8. The distribution box with overheating protection monitoring function according to claim 7, characterized in that: The exhaust pipe (22) and the air guide pipe (23) are rotatably connected, and the exhaust pipe (22) and the reaction chamber (12) are elastically rotatably connected. A third pull rope (24) is wound around the outer side of the exhaust pipe (22), and the upper end of the third pull rope (24) is fixedly connected to the lower surface of the movable plate (13).
9. The distribution box with overheating protection monitoring function according to claim 1, characterized in that: The stirring assembly includes a stirring rod (19) elastically rotatably mounted on the inner side of the reaction chamber (12), and a guide groove (20) with a spiral structure is provided on the upper part of the shaft end of the stirring rod (19), and the upper part of the shaft end of the stirring rod (19) passes through the movable plate (13), and at the same time, a ball (21) is embedded and mounted on the inner wall of the through hole on the movable plate (13), and the ball (21) rolls along the guide groove (20), and the stirring rod (19) is driven to rotate by the ball (21) during the lifting process of the movable plate (13).
Citation Information
Patent Citations
Overheat early warning safety protection distribution box
CN118825791A
Overheat protection structure of distribution box
CN214044576U