Overheat protection early warning device and high-low voltage power distribution cabinet

Abstract

The invention discloses an overheating protection early warning device and a high-low voltage power distribution cabinet, and the device comprises a housing, a plurality of second conductors and third conductors, interfaces disposed at the two ends of the housing, a first conductor connected with the interfaces at the two ends, an execution assembly fixedly connected with the first conductor, and an adjustment assembly for driving the second conductors and the third conductors to move. The second conductors are arranged on one side of the first conductor at intervals, the third conductors are arranged on the other side of the first conductor at intervals, and the execution assembly drives the adjusting assembly to enable the second conductors and the third conductors to approach the first conductor simultaneously. The executing assembly drives the adjusting assembly according to the temperature of the first conductor, when the temperature rises, the first conductor makes contact with the second conductor and the third conductor, the current circulation cross section is increased, resistance is reduced, heat production is reduced, and safety accidents such as equipment damage and fire disasters caused by overheating are effectively prevented.

Description

Technical Field

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

[0002] In the power system, the distribution cabinet plays a vital role. It is the key hub of power distribution and control. Its main responsibility is to reasonably distribute the electric energy from the transmission line to various electrical equipment, and implement circuit protection, monitoring and control functions to ensure that the power system can operate safely, stably and efficiently.

[0003] However, when new electrical equipment is connected to the power system without upgrading the distribution cabinet, the load on the power system will increase. In this case, the temperature of the distribution cabinet will rise, especially at the busbar. This is because when the current of the busbar exceeds its design carrying capacity, it will cause the busbar to 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 overheating protection warning device and a high and low voltage distribution cabinet to alleviate the problem of busbar heating.

[0005] An overheating protection warning device provided in the present application adopts the following technical solution: it includes a shell, a plurality of second conductors and a third conductor, interfaces arranged at both ends of the shell, a first conductor connecting the interfaces at both ends, an actuator fixedly connected to the first conductor, and an adjustment component that drives the second conductor and the third conductor to move, 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, and the actuator drives the adjustment component so that the second conductor and the third conductor are close to the first conductor at the same time.

[0006] By adopting the above technical solution, the execution component can drive the operation of the adjustment component according to the temperature 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 conductor resistivity, L is the conductor length, and S is the conductor cross-sectional area, when the first conductor contacts the second and third conductors, the current flow cross-sectional area increases and the resistance decreases. According to Joule's law, Q=I 2 Rt, where Q is heat, I is current, R is resistance, and t is time. The heat generated by the conductor after contact is less than when not in contact.

[0008] When the first conductor is energized, it generates heat, which is dissipated to the surroundings in the form of thermal radiation. The second and third conductors that are not in contact 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 they will also dissipate the heat to the surroundings. 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 the heating of the first conductor is alleviated.

[0009] When the first conductor contacts the second conductor and the third conductor, the heat conduction path becomes smoother. The heat generated on the first conductor can be transferred to the second and third conductors more quickly, thereby making the temperature distribution of the entire conductor system more uniform. This accelerated 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 smaller 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 with a large current flow cross-section at both ends and a small current flow cross-section in the middle is formed.

[0011] By adopting the above technical solution, 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 of ​​temperature change and can be used as a temperature detection point. By reasonably controlling the current distribution, the voltage fluctuation and power fluctuation caused by current fluctuation 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 large cross-section parts at both ends can be connected to high-power equipment or main circuits, while the small cross-section parts in the middle can be connected to some auxiliary circuits or control circuits, which can make the layout of power equipment more reasonable and improve the maintainability of the equipment. Since the resistance of the small cross-section part in the middle is large, when a fault current occurs, the temperature of this area will rise relatively quickly. This can be used as a fault detection signal. By monitoring the temperature changes in the small cross-section area in the middle, faults in the power system can be discovered in time, and corresponding measures can be taken to repair them, which improves the sensitivity and accuracy of fault detection.

[0012] Optionally, a plurality of first columns are fixedly connected in the shell, the first column is fixedly connected to a contact block, the second conductor and the third conductor are both fixedly connected to a first block, the first block is slidably arranged on the first column, and a first spring is arranged between the first blocks and between the first block closest to the first conductor and the contact block, and the first spring forces the first block to move in a direction away from the first conductor.

[0013] By adopting the above technical solution, several first columns in the shell play a supporting and guiding role. The abutment block is fixed on the first column, providing a fixed support point for the first spring, and also limiting the moving range of the first block. The first block is slidably arranged on the first column, so that the second conductor and the third conductor can move along the direction of the first column within a certain range. 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 abutment block, and its function is to force the first block to move in the direction away from the first conductor. This design ensures that when there is no external force, the second conductor and the third conductor maintain a certain distance from the first conductor; 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 conductor close to the first conductor, and the first spring restores the conductor to the initial position when the force of the adjustment component disappears. This coordinated work enables the conductor system to be adjusted in time according to factors such as load changes in the power system, and realizes dynamic control of the current flow cross section, thereby effectively solving the heating problem of the distribution cabinet when the load changes.

[0014] Optionally, the adjustment assembly includes a plurality of first rods rotatably connected to the shell, a second rod slidably connected to the first rod, a roller rotatably connected to the end of the second rod, a driving rod fixedly connected to the output end of the actuator assembly, and a plurality of third rods fixedly connected to the driving rod, the first rod is provided with a first channel, one end of the second rod is located in the first channel, a second spring is provided between the inside of the first channel and the end of the second rod, and the second spring forces the roller to press the first block.

[0015] By adopting the above technical solution, the first rod is rotatably connected to the housing, providing a support and rotation basis for the entire adjustment assembly. A first channel is provided on the first rod for accommodating part of the second rod; one end of the second rod is located in the first channel, and a second spring is provided between the first channel and the end of the second rod. The function of the second spring is to force the roller at the end of the second rod to press the first block, so that the second conductor and the third conductor are close to the first conductor. The third rod is fixedly connected to the driving rod and is slidably connected to the second rod. The function of the third rod is to push the second rod to slide and rotate in the first rod under the drive of the driving rod, so as to adjust the position of the roller.

[0016] The actuator drives the first rod and the second rod to rotate through the 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 pushes the second conductor and the third conductor to approach 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 gap between the third conductor and the adjacent third conductor is 0, the second spring begins to be compressed, so that the second rod can be retracted into the first channel, so that the roller changes from 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, so that different second conductors and different third conductors are connected to the first conductor in sequence.

[0017] The third rod simultaneously drives the first rod and the second rod on both sides to rotate, so that the second conductor and the third conductor contact with the first conductor; the contact point between the second conductor and the roller and the contact point between the third conductor and the roller are always on the same straight line, that is to say, the force applied by the roller to the second conductor and the third conductor always remains collinear and opposite, which can offset the force of the second conductor and the third conductor on the first conductor, prevent the first conductor from bending and deforming, and prevent it from fitting with the first conductor and the second conductor, resulting in local current unevenness and local heating.

[0018] The regulating component cooperates with the executing component to realize the 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 and the temperature of the first conductor rises, the executing component starts to adjust the distance between the conductors through the regulating component, thereby changing the current flow cross-section to meet the needs of load changes. This dynamic adjustment capability is the core of the entire technical solution, which can effectively solve the heating problem of the distribution cabinet when the load changes and improve the safety and stability of the power system.

[0019] Optionally, the actuator assembly 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 slide groove, the slider can move along the slide groove, and 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 slide groove. When the temperature changes, the memory spring drives the slider to move in the slide groove.

[0020] 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 conductive block is fixedly connected to the first conductor and can quickly transfer the temperature of the first conductor to the memory spring. A slide groove is provided on the heat conductive block, which provides a track for the movement of the slider. The slider is fixedly connected to the driving rod and can slide in the slide groove. 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 slide groove. When the temperature changes, the deformation of the memory spring drives the slider to move in the slide groove.

[0021] The actuator can automatically adjust the distance between conductors according to the temperature change of the first conductor, and has strong temperature responsiveness. When the temperature of the distribution cabinet rises, the actuator will automatically move the second and third conductors closer to the first conductor, increase the current flow cross-section, reduce resistance, and reduce heat. When the temperature drops, the actuator will restore the conductors to their initial positions to avoid unnecessary contact and energy loss. This temperature responsiveness can effectively protect the distribution cabinet and improve the stability and reliability of the power system.

[0022] The shape memory property of the memory spring enables the actuator to respond precisely to temperature changes. Depending on the temperature range, the memory spring can produce different degrees of deformation, thereby accurately controlling the movement distance and speed of the slider. This allows the adjustment component to accurately adjust the distance between the conductors to ensure that the size of the current flow cross-section is just right, which not only meets the load requirements of the power system, but also does not cause excessive energy loss.

[0023] The actuator is one of the core components of the entire technical solution. It can automatically drive the adjustment component to work according to temperature changes, and realize automatic adjustment of the distance between the second conductor and the third conductor and the first conductor. This automatic adjustment function does not require human intervention and can improve the intelligence and operation efficiency of the power system; by automatically adjusting the distance between conductors, the actuator can effectively control the temperature of the distribution cabinet, reduce heating, and improve the safety and stability of the power system. At the same time, precise adjustment can also optimize current distribution, reduce resistance, improve power transmission efficiency, and reduce energy loss.

[0024] Optionally, the heat conductive block is arranged at a location in the middle of the combined conductor where the current flow is minimal.

[0025] By adopting the above technical solution, since the middle area is more sensitive to temperature changes, the heat conductive block is set here to make the actuator have a faster response speed. When the temperature changes, the heat conductive block can quickly transfer heat to the memory spring, and the memory spring will then deform and drive the slider to move. This rapid responsiveness can ensure that when the load of the power system changes or abnormal conditions occur, the actuator can adjust the distance between the conductors in time to maintain the stable operation of the power system.

[0026] Optionally, a ventilation hole is provided on the side of the shell.

[0027] By adopting the above technical solution, the setting of the vents cooperates with the structure of the conductor system to further enhance 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 actuator and the adjustment component, heat changes will occur. The vents promote air circulation and can promptly take away the heat generated by the conductor due to the passage of current and position adjustment. Especially when the first conductor contacts the second and third conductors to form a larger current flow cross-section, although the resistance is reduced, the increase in current may still cause a certain amount of heat to be generated. The presence of vents helps to quickly dissipate this heat and maintain the temperature of the conductor system within a safe range.

[0028] The vents, combined with the combined conductors with large current flow cross-sections at both ends and small current flow cross-sections in the middle, can significantly improve the overall heat dissipation efficiency. Given the unique shape characteristics of the combined conductor, the volume at both ends is large and the volume in the middle is small, which naturally forms a structural form similar to a notch. When air blows toward the combined conductor through the vents, based on the principle of fluid mechanics, the airflow converges at 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 are usually relatively concentrated areas of heat generation due to the large current carried, while the small cross-section part in the middle, although the current is relatively small, will also generate a certain amount of heat due to its relatively large resistance and the heat dissipation is relatively difficult. The synergy between the vents and the shape of the combined conductor is particularly critical. The vents promote the flow of air, allowing external cold air to flow into the shell more effectively. When air blows toward the combined conductor, the airflow gathered at the notch can specifically enhance the air convection heat exchange 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, so that the heat dissipation effect of the middle section is significantly improved; on the other hand, this airflow 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 will be taken away faster by the cold air gathered at the notch during the process of transferring to the surroundings, thus reducing the accumulation of heat 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 that it can operate safely and efficiently under various working conditions.

[0029] A high and low voltage power distribution cabinet, characterized by comprising an overheat protection early warning device.

[0030] By adopting the above technical solution, the problem of busbar heating is alleviated.

[0031] In summary, the present application includes at least one of the following beneficial technical effects: 1. The actuator drives the regulating component according to the temperature of the first conductor. When the temperature rises, the first conductor contacts the second and third conductors, the current flow cross-section increases, the resistance decreases, and the heat generation decreases, effectively preventing safety accidents such as equipment damage and fire caused by overheating. In high-temperature environments or high-load operation, the conductor state can be adjusted in time to reduce the temperature and avoid danger. The vents and conductors cooperate to dissipate heat in time and maintain the conductor temperature within a safe range, further reducing the risk of overheating, ensuring the safe operation of equipment in the distribution cabinet, and improving the overall safety of the power system; 2. 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-section conductors at both ends ensure stable current transmission under high load, and small-section conductors in the middle play a role in current limiting protection in the event of a fault, so that the power system can more efficiently transmit electricity to the user end and improve overall operating efficiency.

[0032] 3. The memory spring of the actuator can automatically drive the adjustment 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 of the power system, enabling it to automatically optimize current flow and heat dissipation according to actual operating conditions, adapt to different load requirements and environmental changes, and improve the overall operating efficiency and management level of the power system.

[0033] 4. The design of a combined conductor with large cross-sections at both ends and a small cross-section in the middle can reasonably control the current distribution, reduce voltage fluctuations and power fluctuations caused by current fluctuations, and improve the quality of power supply. Under different load conditions, it ensures stable current transmission, makes the output voltage and power of the power system more stable, and provides users with reliable power supply; the regulating components and the executing components work together to dynamically adjust the distance between conductors, adjust the current flow cross-section in time according to load changes, optimize current distribution, and 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

[0034] Figure 1 It is a schematic diagram of the overall structure of a high and low voltage distribution cabinet according to an embodiment of the present application; Figure 2 It is a schematic diagram of the overall structure of the overheat protection warning device of the embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the combined conductor of the embodiment of the present application; Figure 4 It is a schematic diagram of the overall structure of the regulating component of the embodiment of the present application; Figure 5 is a schematic diagram of the interior of the first rod of an embodiment of the present application; Figure 6 is a schematic diagram of a vent in an embodiment of the present application; Figure 7 It is a schematic diagram of air flow in the recess of the combined conductor according to an embodiment of the present application.

[0035] Explanation of the reference numerals: 1. housing; 2. general table; 3. sub-table; 4. single-type 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. abutment block; 45. actuator; 451. heat-conducting block; 452. memory spring; 453. slider; 454. slide groove; 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 groove; 467. driving rod; 47. combined conductor; 48. vent; 49. interface; 5. multi-type overheat protection warning device. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.

[0037] The embodiments of the present application disclose an overheat protection warning device and a high and low voltage distribution cabinet.

[0038] Example 1, reference Figure 1 A high and low voltage power distribution cabinet comprises a box body 1, a plurality of sub-meters, a main meter 2 for an external power supply, and a plurality of overheat protection warning devices. The main meter 2 is connected to the sub-meters through the plurality of overheat protection warning devices. In this embodiment, two styles of overheat protection warning devices are used. The main difference between the two styles lies in the number of input terminals and output terminals. One style is a multi-connected overheat protection warning device 5 with 1 input terminal and at least 2 output terminals. The other style is a single-connected overheat protection warning device 4 with 1 input terminal and 1 output terminal. The output terminal of the main meter 2 is connected to the input terminal of the multi-connected overheat protection warning device 5, and the output terminal of the multi-connected overheat protection warning device 5 is connected to the input terminal of the single-connected overheat protection warning device 4. The output terminal of the single-connected overheat protection device is connected to the input terminal of the sub-meter 3. The sub-meter 3 and the main meter 2 used in this embodiment are both equipped with air switches. When a circuit occurs, the circuit system can be automatically disconnected through the sub-meter 3 and the main meter 2.

[0039] refer to Figure 2 and Figure 3The overheat protection warning device includes a shell 44, a plurality of second conductors 42 and a third conductor 43, interfaces 49 arranged at both ends of the shell 44, a first conductor 41 connecting the interfaces 49 at both ends, an actuator 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 first conductor 41, the second conductor 42, and the third conductor 43 used in this embodiment are long rectangular copper plates, so that the first conductor 41, the second conductor 42, and the third conductor 43 are more closely fitted when in contact and the contact area is more uniform; in this embodiment, two groups of adjustment components 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 component 46 is more uniform.

[0040] refer to 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 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 smaller 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. Two groups of adjustment components 46 act on the same second conductor 42 together. The third conductor 43 is located at both ends of the second conductor 42. The two groups of adjustment components 46 act on the third conductor 43 closest to the distance. The actuator 45 drives the adjustment component 46, so that the second conductor 42 and the third conductor 43 are close to 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 with a large current flow cross-section at both ends and a small current flow cross-section in the middle is formed. The larger cross-section 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 current transmission smoother. The smaller cross section in the middle can control the current size, ensure that the current is more reasonably distributed in the entire conductor, and avoid local overheating or current overload; the larger current flow cross section at both ends can withstand greater current impacts, 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.

[0041] refer to Figure 2 and Figure 3A plurality of first columns 441 are fixedly connected in the housing 44. In this embodiment, the number of the first columns 441 is 4 and they are evenly spaced and distributed on one side of the first conductor 41. The first column 441 is fixedly connected with an abutment block 444. The thickness of the abutment block 444 is smaller than that of the first conductor 41. The center height of the abutment block 444 is the same as that of the first conductor 41. The second conductor 42 and the third conductor 43 are both fixedly connected with a first block 442. The thickness of the first block 442 is smaller than that of the second conductor 42 and the third conductor 43. The first block 442 is slidably disposed 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 abutment block 444. The first spring 443 forces the first block 442 to move in a direction away from the first conductor 41. The housing 44, the first column 441, the abutment block 444, and the first block 442 used in the embodiment are all made of insulating materials. The adjustment component 46 provides an external force to make the conductor close to the first conductor 41, and the first spring 443 restores the conductor to its initial position when the force of the adjustment component 46 disappears. This collaborative work enables the conductor system to be adjusted in time according to factors such as load changes in the power system, and realizes dynamic control of the current flow cross section, thereby effectively solving the heating problem of the distribution cabinet when the load changes.

[0042] refer to Figure 4 and Figure 5The 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 rod 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 actuator 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, 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 the first block 442, the first rod 461 and the second rod 462 are combined into a retractable and rotatable combined rod, when the gap between the first conductor 41 and the second conductor 42, the third conductor 43 is 0, or the gap between the second conductor 42 and the adjacent second conductor 42, the gap between 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 be retracted into the first channel 4611, so that the roller 463 changes from 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 other first rods 461 and the second rod 462, so that different second conductors 42 and different third conductors 43 are connected to the first conductor 41 in sequence; the third rod 465 is provided with a through groove 466, and the end of the second rod 462 is fixed with a connecting rod 464 that penetrates the barrel groove, and the roller 463 is arranged on the connecting rod 464. When the temperature rises, the actuator 45 drives the third rod 465 through the driving rod 467, and the third rod 465 moves. Under the limitation 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.

[0043] refer to Figure 4 The actuator 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 slide groove 454. The slider 453 can move along the slide groove 454 and the memory spring 452 is fixedly connected to the slider 453 at one end and fixedly connected to the inner wall of the slide groove 454 at the other end. When the temperature changes, the memory spring 452 drives the slider 453 to move in the slide groove 454. The heat-conducting block 451 is arranged at the middle of the combined conductor 47 where the current flows the least. The memory spring 452 used in this embodiment is normally in an extended 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. The heat-conducting block 451 is arranged here so that the actuator 45 has 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 then deforms and drives the slider 453 to move.

[0044] refer to Figure 6 and Figure 7 , a vent 48 is provided on the side of the shell 44, and the vent 48 faces the side of the first conductor 41, the second conductor 42, and the third conductor 43. When wind enters the vent 48, the vent 48 cooperates with the combined conductor 47 with a large current flow cross-section at both ends and a small current flow cross-section in the middle, which can significantly improve the overall heat dissipation efficiency. The volume at both ends is large and the volume in the middle is small, and thus a structure similar to a notch is naturally formed. When air blows toward the combined conductor 47 through the vent 48, based on the principle of fluid mechanics, the airflow will converge at 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 are usually relatively concentrated areas of heat generation due to the large current carried, while the small cross-section part in the middle has a relatively small current, but due to its relatively large resistance, it will also generate a certain amount of heat and the heat dissipation difficulty is relatively large. The synergy between the vent 48 and the shape of the combined conductor 47 is particularly critical. The vent 48 promotes the flow of air, allowing external cold air to flow into the shell 44 more effectively. When air blows toward the combined conductor 47, the airflow gathered at the notch can specifically enhance the air convection heat exchange in the middle section. On the one hand, this increases the contact area between the middle section and the cold air and the heat exchange efficiency, which significantly improves the heat dissipation effect of the middle section; on the other hand, this airflow 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 will be taken away faster by the cold air gathered at the notch during the process of transfer to the surroundings, thereby reducing the accumulation of heat at both ends, further optimizing the temperature distribution of the entire conductor, and avoiding the occurrence of local overheating.

[0045] The implementation principle of an overheat protection warning device and a high and low voltage distribution cabinet in the embodiment of the present application is as follows: when the high and low voltage 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, and then is connected from its output end to the input end of the single-connected overheat protection warning device 4, and finally from the output end of the single-connected overheat protection warning device 4 to the input end of the sub-meter 3. The sub-meter 3 and the main meter 2 are equipped with air switches, which can automatically disconnect the circuit system when a circuit fault occurs.

[0046] In the overheat protection warning device, under normal conditions, there is a certain gap between the first conductor 41 and the second conductor 42 and the third conductor 43. When the temperature rises, the heat-conducting block 451 located at the middle of the combined conductor 47 where the current flow is the smallest quickly transfers the heat to the memory spring 452. The memory spring 452 is normally in an extended state, and gradually retracts when the temperature rises, driving the slider 453 fixedly connected to the driving rod 467 to move in the slide slot 454.

[0047] The movement of the slider 453 drives the driving rod 467 to move, thereby moving the third rod 465 fixedly connected to the driving rod 467. Under the restriction of the through slot 466, the first rod 461 and the second rod 462 rotate. At this time, the roller 463 connected to the end of the second rod 462 is rotated to push the second conductor 42 and the third conductor 43 close 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 gap between 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 be retracted 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 rods 461 and the second rods 462, and enables different second conductors 42 and different third conductors 43 to be connected with the first conductor 41 in sequence, forming a combined conductor 47 with a large current flow cross-section at both ends and a small current flow cross-section in the middle.

[0048] 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.

[0049] At the same time, the vents 48 on the side of the shell 44 face the side of the conductor. When wind enters the vents 48, the airflow converges toward the notch based on the principle of fluid mechanics in combination with the special shape of the combined conductor 47. 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.

[0050] If the temperature continues to rise and reaches a dangerous level, the air switches of sub-meter 3 and main meter 2 will automatically disconnect the circuit system to achieve overheat protection.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An overheat protection early warning device, characterized in that: The invention comprises a housing (44), a plurality of second conductors (42) and a third conductor (43), interfaces (49) arranged at two ends of the housing (44), a first conductor (41) connecting the interfaces (49) at the two ends, an actuator (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, wherein the second conductors (42) are arranged at intervals on one side of the first conductor (41), and the third conductors (43) are arranged at intervals on the other side of the first conductor (41), and the actuator (45) drives the adjustment component (46) so that the second conductor (42) and the third conductor (43) are simultaneously close to the first conductor (41).

2. The overheat protection warning device according to claim 1, characterized in that: The third conductor (43) is shorter than the second conductor (42), and the third conductor (43) is located at both ends 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) is formed with a large current flow cross section at both ends and a small current flow cross section in the middle.

3. The overheat protection warning device according to claim 2 is characterized in that: A plurality of first columns (441) are fixedly connected in the housing (44), and a contact block (444) is fixedly connected to the first column (441). The second conductor (42) and the third conductor (43) are both fixedly connected to a first block (442). The first block (442) is slidably arranged on the first column (441). A first spring (443) is arranged between the first blocks (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).

4. The overheat protection warning device according to claim 3 is characterized in that: The adjusting assembly (46) comprises a plurality of first rods (461) rotatably connected to the housing (44), a second rod (462) slidably connected to the first rod (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 actuator assembly (45), and a plurality of third rods (465) fixedly connected to the driving rod (467), wherein 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), a second spring (4612) is provided between the inside of the first channel (4611) and the end of the second rod (462), and the second spring (4612) forces the roller (463) to press the first block (442).

5. The overheat protection warning device according to claim 4 is characterized in that: The actuator assembly (45) comprises a memory spring (452), a heat conductive block (451) fixedly connected to the first conductor (41), and a slider (453) fixedly connected to the driving rod (467); the heat conductive block (451) is provided with a slide groove (454); the slider (453) can move along the slide 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 slide groove (454); when the temperature changes, the memory spring (452) drives the slider (453) to move in the slide groove (454).

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

7. The overheat protection warning device according to claim 6, characterized in that: A vent (48) is provided on the side of the shell (44).

8. A high and low voltage distribution cabinet, characterized in that: Including overheat protection warning device.

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