An overheat protection warning device and a high and low voltage power distribution cabinet

Abstract

The present application discloses an overheat protection warning device and a high and low voltage power distribution cabinet, which includes a housing, a plurality of second conductors and third conductors, interfaces provided at both ends of the housing, a first conductor connecting the two interfaces, an execution component fixedly connected to the first conductor, and an adjustment component for driving the movement of the second conductor and the third conductor. The second conductors are arranged at intervals on one side of the first conductor, and the third conductors are arranged at intervals on the other side of the first conductor. The execution component drives the adjustment component to make the second conductor and the third conductor approach the first conductor simultaneously. In the present application, the execution component drives the adjustment component according to the temperature of the first conductor. When the temperature rises to make the first conductor contact the second and third conductors, the current-carrying cross-section increases, the resistance decreases, and the heat generation decreases, effectively preventing safety accidents such as equipment damage and fires caused by overheating.

Description

Technical Field

[0001] This application relates to the technical field of distribution cabinets, and in particular, to an overheat protection warning device and a high and low voltage distribution cabinet. Background Art

[0002] In the power system, the distribution cabinet plays a crucial role. It is the key hub for power distribution and control. Its main responsibility is to reasonably distribute the electric energy from the transmission line to each electrical equipment, and implement functions such as circuit protection, monitoring, and control, so as to ensure the safe, stable, and efficient operation of the power system.

[0003] However, when new electrical equipment is connected to the power system without corresponding upgrade and transformation of the distribution cabinet, the load of the power system will increase. In this case, the temperature of the distribution cabinet will rise, especially in the busbar part. Because when the current of the busbar exceeds its designed carrying capacity, the busbar will heat up. This will not only affect the normal operation of the distribution cabinet, but also pose a potential threat to the safety and stability of the entire power system. Summary of the Invention

[0004] The purpose of this application is to provide an overheat protection warning device and a high and low voltage distribution cabinet to alleviate the problem of busbar heating.

[0005] An overheat protection warning device provided by this application adopts the following technical solution: It includes a housing, several second conductors and third conductors, interfaces arranged at both ends of the housing, a first conductor connecting the two ends of the interfaces, an execution component fixedly connected to the first conductor, and an adjustment component for driving the movement of the second conductor and the third conductor. The second conductors are arranged at intervals on one side of the first conductor, and the third conductors are arranged at intervals on the other side of the first conductor. The execution component drives the adjustment component so that the second conductor and the third conductor approach the first conductor simultaneously.

[0006] By adopting the above technical solution, the execution component can drive the operation of the adjustment component according to the temperature condition of the first conductor, and the adjustment component simultaneously drives the first conductor and the second conductor on both sides to approach the first conductor.

[0007] When the first conductor contacts the second conductor and the third conductor, according to the resistance formula R = ρL / S, where R is the resistance, ρ is the resistivity of the conductor, L is the length of the conductor, and S is the cross-sectional area of the conductor. When the first conductor contacts the second and third conductors, the current-carrying cross-section increases and the resistance decreases. According to the Joule's law Q = I 2 Rt, where Q is the heat, I is the current, R is the resistance, and t is the time. The heat generated by the conductor after contact is less than that before contact.

[0008] After the first conductor is energized, heat is generated and dissipated to the surroundings in the form of thermal radiation. The non-contact second and third conductors can receive part of the thermal radiation from the first conductor. Since their own temperatures are relatively low, their temperatures will rise after receiving the thermal radiation, but at the same time, they will also re-dissipate the heat to the surrounding environment. In this way, part of the thermal radiation of the first conductor is shared, the accumulation of heat around the first conductor is reduced, and thus the heating condition of the first conductor is alleviated.

[0009] When the first conductor is in contact with the second and third conductors, the path of heat conduction is smoother. The heat generated on the first conductor can be transferred to the second and third conductors faster, so that the temperature distribution of the entire conductor system is more uniform. This acceleration of heat conduction helps to reduce the local high temperature of the first conductor and improve the thermal stability of the conductor system.

[0010] Optionally, the length of the third conductor is less than that of the second conductor, and the third conductor is located at both ends of the second conductor. When the second conductor and the third conductor are in contact with the first conductor, a combined conductor is formed with a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle.

[0011] By adopting the above technical solutions, the large cross-sections at both ends can ensure the stable transmission of current under normal operation and high load conditions, while the small cross-section in the middle is a sensitive area for temperature change and can be used as a temperature detection point. By reasonably controlling the current distribution, voltage fluctuations and power fluctuations caused by current fluctuations are reduced, and the power supply quality of the power system is improved; the design of the combined conductor can better adapt to the layout requirements of different electrical components. The parts with large cross-sections at both ends can be connected to equipment with larger power or the main circuit, while the parts with small cross-sections in the middle can be connected to some auxiliary circuits or control circuits, so that the layout of the power equipment is more reasonable and the maintainability of the equipment is improved. Since the resistance of the small cross-section part in the middle is relatively large, when a fault current occurs, the temperature in this area will rise relatively fast. This can be used as a signal for fault detection. By monitoring the temperature change in the small cross-section area in the middle, faults in the power system can be detected in time and corresponding measures can be taken for repair, improving the sensitivity and accuracy of fault detection.

[0012] Optionally, a plurality of first columns are fixedly connected inside the housing. An abutting block is fixedly connected to the first column. The second conductor and the third conductor are both fixedly connected with a first block. The first block is slidably arranged on the first column. First springs are arranged between the first blocks and between the first block closest to the first conductor and the abutting block. The first springs force the first blocks to move away from the first conductor.

[0013] By adopting the above technical solution, several first columns in the housing play a role in supporting and guiding. The abutting block is fixed on the first column, providing a fixed support point for the first spring and also restricting the movement range of the first block. The first block is slidably arranged on the first column, enabling the second conductor and the third conductor to move within a certain range along the direction of the first column. The first spring is connected between the first block and the first block, and between the first block closest to the first conductor and the abutting block. Its function is to force the first block to move away from the first conductor. Such a design enables the second conductor and the third conductor to maintain a certain distance from the first conductor when there is no external force;

[0014] The above structure cooperates with the adjustment component for the movement of the second conductor and the third conductor. The adjustment component provides an external force to make the conductors approach the first conductor, while the first spring restores the conductors to the initial position when the acting force of the adjustment component disappears. This collaborative work enables the conductor system to be adjusted in a timely manner according to factors such as the load change of the power system, realizing the dynamic control of the current-carrying cross-section, and thus effectively solving the heating problem of the power distribution cabinet during load changes.

[0015] Optionally, the adjustment component includes several first rods rotatably connected to the housing, second rods slidably connected to the first rods, rollers rotatably connected to the ends of the second rods, drive rods fixedly connected to the output ends of the actuating components, and several third rods fixedly connected to the drive rods. The first rods are provided with first channels, one end of the second rods is located in the first channels, and a second spring is provided between the interior of the first channels and the ends of the second rods. The second spring forces the rollers to press against the first block.

[0016] By adopting the above technical solution, the first rods are rotatably connected to the housing, providing a basis for support and rotation for the entire adjustment component. The first rods are provided with first channels for accommodating part of the second rods; one end of the second rods is located in the first channels, and a second spring is provided between the interior of the first channels and the ends of the second rods. The function of the second spring is to force the rollers at the ends of the second rods to press against the first block, so that the second conductor and the third conductor approach the first conductor. The third rods are fixedly connected to the drive rods and are slidably connected to the second rods. The function of the third rods is to drive the second rods to slide and rotate in the first rods under the drive of the drive rods, thereby realizing the adjustment of the positions of the rollers.

[0017] The actuating component drives the first rod and the second rod to rotate through a driving rod. When the second conductor and the third conductor are not in contact with the first conductor, there is a gap between the conductors. At this time, the rotation of the first rod and the second rod is to push the second conductor and the third conductor closer to the first conductor. When the gap between the first conductor and the second conductor and the third conductor is 0, or the gap between the second conductor and the adjacent second conductor and the third conductor and the adjacent third conductor is 0, at this time, the second spring begins to be compressed, so that the second rod can retract into the first channel, so that the roller changes from originally pushing the first block to pressing the first block, so that the first rod and the second rod will not be stuck due to space limitations, and will not affect the movement of the remaining first rods and second rods. In this way, different second conductors and different third conductors are sequentially connected to the first conductor.

[0018] The third rod simultaneously drives the first rods and the second rods on both sides to rotate, so that the second conductor and the third conductor are in contact with the first conductor; the contact points between the second conductor and the roller and the contact points between the third conductor and the roller are always on the same straight line. That is to say, the forces exerted by the roller on the second conductor and the third conductor always remain collinear and opposite, so that the forces exerted by the second conductor and the third conductor on the first conductor can be offset, preventing the first conductor from bending and deforming, being unable to fit with the first conductor and the second conductor, resulting in local current non-uniformity and local heating.

[0019] The adjusting component and the actuating component cooperate with each other to achieve dynamic adjustment of the distance between the second conductor and the third conductor and the first conductor. When the load of the power system changes, causing the temperature of the first conductor to rise, the actuating component starts, and the distance between the conductors is adjusted through the adjusting component, thereby changing the current-carrying cross-section to meet the requirements of load changes. This dynamic adjustment ability is the core of the entire technical solution, which can effectively solve the heating problem of the distribution cabinet during load changes and improve the safety and stability of the power system.

[0020] Optionally, the actuating component includes a memory spring, a heat-conducting block fixedly connected to the first conductor, and a slider fixedly connected to the driving rod. The heat-conducting block is provided with a chute, and the slider can move along the chute. One end of the memory spring is fixedly connected to the slider, and the other end is fixedly connected to the inner wall of the chute. When the temperature changes, the memory spring drives the slider to move in the chute.

[0021] By adopting the above technical solution, the memory spring has shape memory characteristics and can deform when the temperature changes. When the temperature rises or falls, the length of the memory spring changes, thereby generating a driving force. The heat conducting block is fixedly connected to the first conductor and can quickly transfer the temperature of the first conductor to the memory spring. The heat conducting block is provided with a chute, which provides a track for the movement of the slider. The slider is fixedly connected to the driving rod and can slide in the chute. One end of the memory spring is fixedly connected to the slider, and the other end is fixedly connected to the inner wall of the chute. When the temperature changes, the deformation of the memory spring drives the slider to move in the chute.

[0022] The execution component can automatically adjust the distance between the conductors according to the temperature change of the first conductor and has strong temperature responsiveness. When the temperature of the power distribution cabinet rises, the execution component will automatically move the second conductor and the third conductor closer to the first conductor, increasing the current-carrying cross-section, reducing the resistance, and reducing heat generation. When the temperature drops, the execution component will move the conductors back to the initial position to avoid unnecessary contact and energy loss. This temperature responsiveness can effectively protect the power distribution cabinet and improve the stability and reliability of the power system.

[0023] The shape memory characteristics of the memory spring enable the execution component to respond precisely to temperature changes. According to different temperature ranges, the memory spring can produce different degrees of deformation, thereby precisely controlling the moving distance and speed of the slider. This enables the adjustment component to precisely adjust the distance between the conductors, ensuring that the size of the current-carrying cross-section is just right, meeting the load requirements of the power system without causing excessive energy loss.

[0024] The execution component is one of the core components of the entire technical solution. It can automatically drive the adjustment component to work according to temperature changes, realizing the automatic adjustment of the distance between the second conductor, the third conductor and the first conductor. This automatic adjustment function does not require manual intervention, which can improve the intelligence level and operation efficiency of the power system; by automatically adjusting the distance between the conductors, the execution component can effectively control the temperature of the power distribution cabinet, reduce the heat generation phenomenon, and improve the safety and stability of the power system. At the same time, precise adjustment can also optimize the current distribution, reduce the resistance, improve the power transmission efficiency, and reduce energy consumption.

[0025] Optionally, the heat conducting block is arranged at the position with the smallest current flow in the middle of the combined conductor.

[0026] By adopting the above technical solution, since the middle region is more sensitive to temperature changes, setting the heat conducting block here can enable the actuating component to have a faster response speed. When the temperature changes, the heat conducting block can quickly transfer heat to the memory spring, and the memory spring will immediately deform and drive the slider to move. This fast responsiveness can ensure that when the load of the power system changes or an abnormal situation occurs, the actuating component can timely adjust the distance between the conductors and maintain the stable operation of the power system.

[0027] Optionally, a ventilation opening is provided on the side surface of the housing.

[0028] By adopting the above technical solution, the setting of the ventilation opening cooperates with the structure of the conductor system to further improve the heat dissipation effect of the conductor. When the second conductor and the third conductor contact or adjust their positions with the first conductor under the action of the actuating component and the adjusting component, heat changes will occur. The ventilation opening promotes air circulation and can timely take away the heat generated by the conductor due to current passing through and position adjustment. Especially when the first conductor contacts the second and third conductors to form a larger current-carrying cross-section, although the resistance decreases, the increase in current may still cause a certain amount of heat generation. The existence of the ventilation opening helps to quickly dissipate this heat and maintain the temperature of the conductor system within a safe range.

[0029] The ventilation opening is combined with a combined conductor that has a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle, which can significantly improve the overall heat dissipation efficiency. Given the unique shape characteristics of the combined conductor, its volume is larger at both ends and smaller in the middle, thus naturally forming a structure similar to a notch. When air blows from the ventilation opening towards the combined conductor, based on the principle of fluid mechanics, the air flow will converge towards the notch under the guidance of this special shape. During the power transmission process of the combined conductor, the large cross-section parts at both ends carry a relatively large current and are usually relatively concentrated areas of heat generation. Although the current in the small cross-section part in the middle is relatively small, due to its relatively large resistance, it will also generate a certain amount of heat and the heat dissipation is relatively difficult. The synergistic effect between the ventilation opening and the shape of the combined conductor is particularly crucial. The ventilation opening promotes the air flow, enabling the external cold air to flow more effectively into the interior of the housing. When the air blows towards the combined conductor, the air flow that gathers at the notch can specifically enhance the air convection heat transfer in the middle section. On the one hand, this increases the contact area and heat exchange efficiency between the middle section and the cold air, significantly improving the heat dissipation effect of the middle section; on the other hand, this air flow distribution also helps to balance the temperature of the entire combined conductor. Because the heat generated by the large cross-section parts at both ends is carried away more quickly by the cold air gathered at the notch during the process of transferring to the surroundings, reducing the heat accumulation at both ends, further optimizing the temperature distribution of the entire conductor, and avoiding the occurrence of local overheating. This not only ensures the stable performance of the combined conductor and extends its service life, but also improves the reliability and stability of the power system as a whole, ensuring its safe and efficient operation under various working conditions.

[0030] A high and low voltage power distribution cabinet, characterized in that it includes an overheat protection warning device.

[0031] By adopting the above technical solution, the problem of busbar heating is alleviated.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. The execution component drives the adjustment component according to the temperature of the first conductor. When the temperature rises, the first conductor contacts the second and third conductors, the current-carrying cross-section increases, the resistance decreases, and the heat generation decreases, effectively preventing safety accidents such as equipment damage and fires caused by overheating. In a high-temperature environment or during high-load operation, it can timely adjust the conductor state to reduce the temperature, avoid danger, the ventilation opening cooperates with the conductor, timely dissipates heat, maintains the conductor temperature within a safe range, further reduces the overheating risk, ensures the safe operation of the equipment in the power distribution cabinet, and improves the overall safety of the power system;

[0034] 2. A reasonable conductor structure and regulating component design ensure stable current transmission under different loads, reduce the impact of current fluctuations or local overheating on power transmission, and improve the quality and efficiency of power transmission. For example, large cross-section conductors at both ends ensure stable current transmission under high loads, and the small cross-section in the middle plays a current-limiting and protective role during faults, enabling the power system to deliver electrical energy to the user end more efficiently and enhancing the overall operating efficiency.

[0035] 3. The memory spring of the actuator can automatically drive the regulating component to work according to temperature changes, realizing automatic adjustment of the distance between conductors without frequent manual intervention. This automatic adjustment function improves the intelligence level of the power system, enabling it to automatically optimize current flow and heat dissipation according to the actual operating conditions, adapt to different load demands and environmental changes, and enhance the overall operating efficiency and management level of the power system.

[0036] 4. The combined conductor design with large cross-sections at both ends and a small cross-section in the middle reasonably controls the current distribution, reduces voltage fluctuations and power fluctuations caused by current fluctuations, and improves the power supply quality. Under different load conditions, it ensures stable current transmission, making the output voltage and power of the power system more stable, providing reliable power supply for users; the regulating component and the actuator cooperate to achieve dynamic adjustment of the distance between conductors, timely adjust the current-carrying cross-section according to load changes, optimize the current distribution, enable the power system to maintain stable current transmission under various working conditions, reduce problems such as local overheating or overload caused by uneven current distribution, and improve system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the overall structure of a high and low voltage switchgear cabinet according to an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the overall structure of an overheat protection warning device according to an embodiment of the present application;

[0039] Figure 3 is a schematic diagram of the overall structure of a combined conductor according to an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the overall structure of a regulating component according to an embodiment of the present application;

[0041] Figure 5 is a schematic diagram of the interior of the first rod according to an embodiment of the present application;

[0042] Figure 6 is a schematic diagram of a ventilation opening according to an embodiment of the present application;

[0043] Figure 7 is a schematic diagram of the air flow in the concave part of the combined conductor according to an embodiment of the present application.

[0044] Description of the reference numerals: 1, box body; 2, main meter; 3, sub-meter; 4, single-connected overheat protection warning device; 41, first conductor; 42, second conductor; 43, third conductor; 44, housing; 441, first column; 442, first block; 443, first spring; 444, abutting block; 45, execution component; 451, heat-conducting block; 452, memory spring; 453, slider; 454, chute; 46, adjustment component; 461, first rod; 4611, first channel; 4612, second spring; 462, second rod; 463, roller; 464, connecting rod; 465, third rod; 466, through slot; 467, driving rod; 47, combined conductor; 48, ventilation opening; 49, interface; 5, multi-connected overheat protection warning device. Detailed implementation manners

[0045] The following further describes the present application in detail with reference to the Figure 1 - attached Figure 7 drawings.

[0046] The embodiment of the present application discloses an overheat protection warning device and a high and low voltage power distribution cabinet.

[0047] Embodiment 1. Refer to Figure 1 a high and low voltage power distribution cabinet, which includes a box body 1, several sub-meters, a main meter 2 connected to an external power supply, and several overheat protection warning devices. The main meter 2 is connected to the sub-meters through several overheat protection warning devices. In this embodiment, two styles of overheat protection warning devices are adopted. The main difference between the two lies in the number of input ends and output ends. One is a multi-connected overheat protection warning device 5 with 1 input end and at least 2 output ends, and the other is a single-connected overheat protection warning device 4 with 1 input end and 1 output end. The output end of the main meter 2 is connected to the input end of the multi-connected overheat protection warning device 5. The output end of the multi-connected overheat protection warning device 5 is connected to the input end of the single-connected overheat protection warning device 4. The output end of the single-connected overheat protection device is connected to the input end of the sub-meter 3. In this embodiment, both the sub-meter 3 and the main meter 2 are equipped with air switches. When a circuit fault occurs, the circuit system can be automatically disconnected through the sub-meter 3 and the main meter 2.

[0048] Refer to Figure 2 and Figure 3, the overheat protection warning device includes a housing 44, a plurality of second conductors 42 and third conductors 43, interfaces 49 provided at both ends of the housing 44, a first conductor 41 connecting the two interfaces 49, an actuator assembly 45 fixedly connected to the first conductor 41, and an adjustment assembly 46 for driving the movement of the second conductors 42 and third conductors 43. In this embodiment, the first conductor 41, second conductors 42, and third conductors 43 are long rectangular copper plates, so that the first conductor 41, second conductors 42, and third conductors 43 fit more closely and have a more uniform contact area when in contact; in this embodiment, two adjustment assemblies 46 are respectively located at both ends of the first conductor 41, so that when the conductors are in contact, the clamping force applied by the adjustment assembly 46 is more uniform.

[0049] Reference Figure 2 and Figure 3 , in this embodiment, the number of second conductors 42 is 3, and the 3 second conductors 42 are arranged at equal intervals on one side of the first conductor 41. The number of third conductors 43 is 6, and the 6 third conductors 43 are evenly divided into two groups and arranged at equal intervals on the other side of the first conductor 41; the length of the third conductor 43 is less than that of the second conductor 42. In this embodiment, the length of the third conductor 43 is one-third of the length of the second conductor 42. The two adjustment assemblies 46 act on the same second conductor 42 together. The third conductors 43 are located at both ends of the second conductor 42. The two adjustment assemblies 46 act on the third conductors 43 closest to them. The actuator assembly 45 drives the adjustment assembly 46 to make the second conductor 42 and the third conductor 43 approach the first conductor 41 at the same time; when the second conductor 42 and the third conductor 43 are in contact with the first conductor 41, a combined conductor 47 is formed with a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle. The larger cross-sections at both ends can better adapt to the inflow and outflow of current, reduce the impedance mismatch problem when the current enters and leaves the conductor, and make the transmission of current smoother. The smaller cross-section in the middle can control the magnitude of the current, ensure a more reasonable distribution of current throughout the conductor, and avoid local overheating or current overload; the larger current-carrying cross-section at both ends can withstand a greater current impact, improving the stability of the conductor during startup or load changes. The smaller cross-section in the middle can play a certain buffering role, reducing the impact of current mutations caused by unexpected situations on the entire circuit.

[0050] Reference Figure 2 and [[ID=X]] Figure 3, several first columns 441 are fixedly connected inside the housing 44. In this embodiment, the number of the first columns 441 is 4, and they are evenly distributed on one side of the first conductor 41. A contact block 444 is fixedly connected to the first column 441. The thickness of the contact block 444 is less than that of the first conductor 41, and the central height of the contact block 444 is the same as the central height of the first conductor 41. Both the second conductor 42 and the third conductor 43 are fixedly connected with a first block 442. The thickness of the first block 442 is less than the thicknesses of the second conductor 42 and the third conductor 43. The first block 442 is slidably arranged on the first column 441. A first spring 443 is provided between the first block 442 and the first block 442, and between the first block 442 closest to the first conductor 41 and the contact block 444. The first spring 443 forces the first block 442 to move away from the first conductor 41. In the embodiment, the housing 44, the first column 441, the contact block 444, and the first block 442 are all made of insulating materials. The adjusting assembly 46 provides an external force to make the conductor approach the first conductor 41, while the first spring 443 makes the conductor return to the initial position when the acting force of the adjusting assembly 46 disappears. This collaborative work enables the conductor system to be adjusted in a timely manner according to factors such as the load change of the power system, realizes the dynamic control of the current-carrying cross-section, and thus effectively solves the heating problem of the power distribution cabinet during load changes.

[0051] Reference Figure 4 and Figure 5, the adjusting assembly 46 includes a plurality of first rods 461 rotatably connected to the housing 44, a second rod 462 slidably connected to the first rods 461, a roller 463 rotatably connected to the end of the second rod 462, a driving rod 467 fixedly connected to the output end of the actuating assembly 45, and a plurality of third rods 465 fixedly connected to the driving rod 467; the first rod 461 is provided with a first channel 4611, one end of the second rod 462 is located in the first channel 4611, and a second spring 4612 is provided between the inside of the first channel 4611 and the end of the second rod 462. The second spring 4612 forces the roller 463 to press against the first block 442. The first rod 461 and the second rod 462 are combined into a telescopic and rotatable combined rod. When the gap between the first conductor 41 and the second conductor 42 and the third conductor 43 is 0, or when the gap between the second conductor 42 and the adjacent second conductor 42 and the third conductor 43 and the adjacent third conductor 43 is 0, at this time the second spring 4612 begins to be compressed, so that the second rod 462 can retract into the first channel 4611, so that the roller 463 changes from originally pushing the first block 442 to pressing the first block 442, so that the first rod 461 and the second rod 462 will not be stuck due to space limitations, and will not affect the movement of the remaining first rods 461 and second rods 462. In this way, different second conductors 42 and different third conductors 43 are sequentially connected to the first conductor 41; the third rod 465 is provided with a through groove 466, and a connecting rod 464 passing through the barrel groove is fixedly connected to the end of the second rod 462. The roller 463 is arranged on the connecting rod 464. When the temperature rises, when the actuating assembly 45 drives the third rod 465 through the driving rod 467, the third rod 465 moves. Under the restriction of the through groove 466, the first rod 461 and the second rod 462 rotate, so that the second conductor 42 and the third conductor 43 abut against the first conductor 41.

[0052] Reference Figure 4 , the actuating assembly 45 includes a memory spring 452, a heat conducting block 451 fixedly connected to the first conductor 41, and a slider 453 fixedly connected to the driving rod 467. The heat conducting block 451 is provided with a sliding groove 454, and the slider 453 can move along the sliding groove 454. One end of the memory spring 452 is fixedly connected to the slider 453, and the other end is fixedly connected to the inner wall of the sliding groove 454. When the temperature changes, the memory spring 452 drives the slider 453 to move in the sliding groove 454. The heat conducting block 451 is arranged at the place where the current flow in the middle of the combined conductor 47 is the smallest. In this embodiment, the memory spring 452 is in an extended state in its normal state. When the temperature gradually rises, the memory spring 452 gradually retracts. The middle area of the combined conductor 47 is more sensitive to temperature changes. Arranging the heat conducting block 451 here can make the actuating assembly 45 have a faster response speed. When the temperature changes, the heat conducting block 451 can quickly transfer heat to the memory spring 452, and the memory spring 452 immediately deforms and drives the slider 453 to move.

[0053] ReferenceFigure 6 and Figure 7 , a ventilation opening 48 is provided on the side of the housing 44, and the ventilation opening 48 faces the sides of the first conductor 41, the second conductor 42, and the third conductor 43. When wind enters the ventilation opening 48, the ventilation opening 48 cooperates with the combined conductor 47 with a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle, which can significantly improve the overall heat dissipation efficiency. The volume is larger at both ends and smaller in the middle, thus naturally forming a structure similar to a notch. When air blows from the ventilation opening 48 towards the combined conductor 47, based on the principle of fluid mechanics, the air flow will converge towards the notch under the guidance of this special shape. During the power transmission process of the combined conductor 47, the large cross-section parts at both ends carry a large current and are usually the relatively concentrated areas of heat generation. Although the current in the small cross-section part in the middle is relatively small, due to its relatively large resistance, it will also generate a certain amount of heat and the heat dissipation is relatively difficult. The synergistic effect of the shape of the ventilation opening 48 and the combined conductor 47 is particularly crucial. The ventilation opening 48 promotes the air flow, enabling the external cold air to flow into the interior of the housing 44 more effectively. When the air blows towards the combined conductor 47, the air flow converging towards the notch can specifically enhance the air convection heat transfer in the middle section. On the one hand, this increases the contact area and heat exchange efficiency between the middle section and the cold air, significantly improving the heat dissipation effect of the middle section; on the other hand, this air flow distribution also helps to balance the temperature of the entire combined conductor 47. Because the heat generated by the large cross-section parts at both ends is carried away by the cold air converging at the notch faster during the process of transferring to the surroundings, the accumulation of heat at both ends is reduced, further optimizing the temperature distribution of the entire conductor and avoiding the occurrence of local overheating.

[0054] The implementation principle of an overheat protection warning device and a high-voltage and low-voltage power distribution cabinet in an embodiment of the present application is as follows: When the high-voltage and low-voltage power distribution cabinet is working, the current enters the input end of the multi-connected overheat protection warning device 5 from the output end of the main meter 2, then is connected to the input end of the single-connected overheat protection warning device 4 from its output end, and finally is connected to the input end of the sub-meter 3 from the output end of the single-connected overheat protection warning device 4. The sub-meter 3 and the main meter 2 are equipped with air switches, which can automatically disconnect the circuit system in case of a circuit fault.

[0055] In the overheat protection warning device, under normal conditions, there is a certain gap between the first conductor 41, the second conductor 42, and the third conductor 43. When the temperature rises, the heat conduction block 451 at the place with the smallest current flow in the middle of the combined conductor 47 quickly transfers the heat to the memory spring 452. The memory spring 452 is in an extended state in its normal state and gradually retracts when the temperature rises, driving the slider 453 fixedly connected to the driving rod 467 to move in the sliding groove 454.

[0056] The movement of the slider 453 drives the movement of the drive rod 467, and further causes the third rod 465 fixedly connected to the drive rod 467 to move. Under the limitation of the through groove 466, the first rod 461 and the second rod 462 rotate. At this time, the roller 463 rotatably connected to the end of the second rod 462 pushes the second conductor 42 and the third conductor 43 closer to the first conductor 41. When the gap between the first conductor 41 and the second conductor 42 and the third conductor 43 is 0, or the gap between the second conductor 42 and the adjacent second conductor 42 and the third conductor 43 and the adjacent third conductor 43 is 0, the second spring 4612 begins to be compressed, so that the second rod 462 can retract into the first channel 4611. At this time, the roller 463 changes from pushing the first block 442 to pressing the first block 442, which not only avoids jamming due to space limitations but also does not affect the movement of the remaining first rod 461 and second rod 462, realizing the sequential connection of different second conductors 42 and different third conductors 43 to the first conductor 41, forming a combined conductor 47 with a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle.

[0057] This conductor structure can better adapt to the inflow and outflow of current, reduce impedance mismatch problems, and make current transmission smoother; control the current size to avoid local overheating or current overload; improve the stability of the conductor during startup or load changes and reduce the impact of current mutations.

[0058] At the same time, the ventilation openings 48 on the side of the housing 44 face the side of the conductor. When wind enters the ventilation openings 48, in cooperation with the special shape of the combined conductor 47 and based on the principle of fluid mechanics, the air flow converges towards the notch. This increases the contact area between the middle section and the cold air and the heat exchange efficiency, improves the heat dissipation effect of the middle section, and also helps to balance the temperature of the entire combined conductor 47, reduce the accumulation of heat at both ends, and avoid the occurrence of local overheating.

[0059] If the temperature continues to rise to a dangerous level, the air switches of the sub-meter 3 and the main meter 2 will automatically disconnect the circuit system to achieve overheat protection.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An overheat protection warning device, characterized in that: It includes a housing (44), a number of second conductors (42) and third conductors (43), interfaces (49) provided at both ends of the housing (44), a first conductor (41) connecting the interfaces (49) at both ends, an execution component (45) fixedly connected to the first conductor (41), and an adjustment component (46) for driving the second conductor (42) and the third conductor (43) to move. The second conductors (42) are arranged at intervals on one side of the first conductor (41), the third conductors (43) are arranged at intervals on the other side of the first conductor (41), and the execution component (45) drives the adjustment component (46) so that the second conductor (42) and the third conductor (43) approach the first conductor (41) simultaneously; The length of the third conductor (43) is less than that of the second conductor (42). When the second conductor (42), the third conductor (43) and the first conductor (41) are in contact, a combined conductor (47) with a large current-carrying cross-section at both ends and a small current-carrying cross-section in the middle is formed.

2. The overheat protection warning device according to claim 1, wherein: A number of first posts (441) are fixedly connected inside the housing (44), and a contact block (444) is fixedly connected to the first post (441). The second conductor (42) and the third conductor (43) are both fixedly connected with a first block (442). The first block (442) is slidably arranged on the first post (441). A first spring (443) is provided between the first block (442) and the first block (442), and between the first block (442) closest to the first conductor (41) and the contact block (444). The first spring (443) forces the first block (442) to move in a direction away from the first conductor (41).

3. The overheat protection warning device according to claim 2, characterized in that: The adjustment component (46) includes a number of first rods (461) rotatably connected to the housing (44), second rods (462) slidably connected to the first rods (461), rollers (463) rotatably connected to the ends of the second rods (462), a driving rod (467) fixedly connected to the output end of the execution component (45), and a number of third rods (465) fixedly connected to the driving rod (467). The first rod (461) is provided with a first channel (4611). One end of the second rod (462) is located inside the first channel (4611). A second spring (4612) is provided between the inside of the first channel (4611) and the end of the second rod (462). The second spring (4612) forces the roller (463) to press against the first block (442).

4. The overheat protection warning device according to claim 3, wherein: The execution component (45) includes a memory spring (452), a heat-conducting block (451) fixedly connected to the first conductor (41), and a slider (453) fixedly connected to the driving rod (467). The heat-conducting block (451) is provided with a chute (454). The slider (453) can move along the chute (454). One end of the memory spring (452) is fixedly connected to the slider (453), and the other end is fixedly connected to the inner wall of the chute (454). When the temperature changes, the memory spring (452) drives the slider (453) to move inside the chute (454).

5. The overheat protection warning device according to claim 4, characterized in that: The heat conducting block (451) is arranged at the position with the minimum current flow in the middle of the combined conductor (47).

6. The overheat protection warning device according to claim 5, characterized in that: The side surface of the housing (44) is provided with a ventilation opening (48).

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