A general external heat dissipation device of a circuit breaker and the circuit breaker

Abstract

This utility model provides a universal external heat dissipation device and circuit breaker for circuit breakers, relating to the field of heat dissipation technology for electrical equipment. The universal external heat dissipation device for circuit breakers includes: a rectangular frame, heat dissipation fastening bolts, and heat sinks; multiple threaded holes are provided on one side of the frame, with a heat dissipation fastening bolt screwed into each threaded hole; a heat sink is provided at the end of each heat dissipation fastening bolt away from the rectangular frame. The heat sink is directly connected to the end of the heat dissipation fastening bolt, forming a good heat conduction path with the circuit breaker housing, which helps to quickly dissipate the heat generated inside the circuit breaker, prevents local overheating, and ensures stable equipment operation. The rectangular frame can be standardized according to the external dimensions of different circuit breaker models. By adjusting the position and number of heat dissipation fastening bolts, it can be adapted to various specifications of circuit breakers, improving the versatility of the device.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for electrical equipment, and in particular to a universal external heat dissipation device for circuit breakers and a circuit breaker equipped with this heat dissipation device. Background Technology

[0002] In power systems, circuit breakers, as critical electrical protection devices, are widely used in low-voltage, medium-voltage, and high-voltage power distribution systems. Their main function is to automatically disconnect circuits under normal or fault conditions to protect the safe operation of electrical equipment and lines. However, in actual operation, circuit breakers generate a large amount of heat when load current flows through the contacts and conductive components, especially under high load or frequent operation conditions, where temperature rise is a particularly prominent issue.

[0003] Traditional circuit breakers typically rely on natural convection for cooling, which involves heat exchange between the casing surface and the surrounding air. However, with the increasing power density of modern electrical systems, traditional cooling methods are no longer sufficient to meet the demands for efficient heat dissipation. This can easily lead to excessively high internal temperatures within the circuit breaker, resulting in safety hazards such as contact oxidation, insulation aging, and operational failure, severely impacting the stability and lifespan of the equipment. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide an external heat dissipation device that has a reasonable structure, is easy to install, has strong versatility, and has intelligent auxiliary heat dissipation function.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A universal external heat dissipation device for a circuit breaker includes: a rectangular frame, heat dissipation fastening bolts, and heat sinks;

[0007] The frame has multiple threaded holes on one side, and a heat dissipation fastening bolt is screwed into each threaded hole;

[0008] Each of the heat dissipation fastening bolts has a heat sink at the end furthest from the rectangular frame.

[0009] Optionally, the heat sink is provided on the head of the heat dissipation fastening bolt.

[0010] Optionally, the heat sink is provided on the screw near the head of the heat dissipation fastening bolt.

[0011] Optionally, the multiple threaded holes are evenly distributed.

[0012] Optionally, it also includes an intelligent auxiliary heat dissipation system;

[0013] The intelligent auxiliary heat dissipation system is installed on the rectangular frame and is used to automatically turn on after detecting that the temperature of the circuit breaker has reached the preset temperature, so as to dissipate heat and cool down the circuit breaker.

[0014] Optionally, the intelligent auxiliary heat dissipation system includes: a fan, a controller, a power supply, and a temperature detection module;

[0015] The controller is electrically connected to the fan, the power supply, and the temperature detection module.

[0016] The air delivery end of the fan faces the inside of the rectangular frame;

[0017] The temperature detection module is located near the circuit breaker.

[0018] Optionally, the intelligent auxiliary heat dissipation system further includes a mounting bracket;

[0019] The mounting bracket is located on the other side of the rectangular frame;

[0020] The fan is mounted on the mounting bracket such that the air delivery end of the fan faces the other side of the rectangular frame;

[0021] Ventilation holes are also provided on the other side of the rectangular frame.

[0022] Optionally, the temperature detection module is provided at the end of the heat dissipation fastening bolt away from its head.

[0023] Optionally, the end of the heat dissipation fastening bolt away from its head is provided with a mounting groove;

[0024] The temperature detection module is installed in the mounting slot.

[0025] A circuit breaker includes a circuit breaker body and a universal external heat dissipation device for the circuit breaker as described in the above technical solution.

[0026] The circuit breaker body is housed within the rectangular frame;

[0027] After the heat dissipation fastening bolt is screwed into the threaded hole, the end of the heat dissipation fastening bolt away from its head abuts against the outside of the circuit breaker body.

[0028] The technical solution provided by this utility model has the following technical effects:

[0029] 1. The rectangular frame can be standardized according to the external dimensions of different circuit breaker models. By adjusting the position and number of heat dissipation fastening bolts, it can be adapted to various specifications of circuit breakers, improving the versatility of the device.

[0030] 2. By installing a heat dissipation device consisting of a rectangular frame, heat dissipation fastening bolts, and heat sinks on the outside of the circuit breaker, the heat dissipation area on the circuit breaker surface can be effectively increased, improving heat conduction and dissipation efficiency. The heat sinks are directly connected to the ends of the heat dissipation fastening bolts, forming a good heat conduction path with the circuit breaker housing, which helps to quickly dissipate the heat generated inside the circuit breaker, prevent local overheating, and ensure stable equipment operation. Attached Figure Description

[0031] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the first structure of a universal external heat dissipation device for a circuit breaker provided in this embodiment of the present utility model;

[0033] Figure 2 This is a second structural schematic diagram of a universal external heat dissipation device for a circuit breaker provided in this embodiment of the present utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Rectangular frame; 2. Heat dissipation fastening bolts; 3. Heat sink; 4. Intelligent auxiliary heat dissipation system; 5. Ventilation holes;

[0036] 41. Fan, 42. Controller, 43. Temperature detection module, 44. Mounting bracket. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0038] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0039] Figure 1 This is a schematic diagram of the first structure of a universal external heat dissipation device for a circuit breaker provided in this embodiment of the present utility model; Figure 2This is a second structural schematic diagram of a universal external heat dissipation device for a circuit breaker provided in this embodiment of the utility model. The above schematic diagram is only for illustrating the structural relationships related to the utility model and is not intended to represent the actual scale of a real product.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, a universal external heat dissipation device for a circuit breaker in this embodiment includes: a rectangular frame 1, heat dissipation fastening bolts 2, and heat sinks 3; a plurality of threaded holes are provided on one side of the frame, and a heat dissipation fastening bolt 2 is screwed into each threaded hole; a heat sink 3 is provided at the end of each heat dissipation fastening bolt 2 away from the rectangular frame 1.

[0042] Insert the rectangular frame 1 from above or side of the circuit breaker, ensuring that the side without threaded holes is flush against the side of the circuit breaker housing. Screw the heat dissipation fastening bolt 2 into the threaded holes of the frame, with the head of the bolt 2 embedded inside the frame and the end abutting against the circuit breaker housing.

[0043] The heat generated during circuit breaker operation dissipates outward through its own casing. The contact between the heat dissipation fastening bolt 2 and the circuit breaker casing allows heat to be quickly conducted from the circuit breaker casing to the heat dissipation fastening bolt 2, and then dissipated into the environment through natural convection of the heat sink 3 or forced air cooling (such as fan 41).

[0044] The heat dissipation fastening bolt 2 is not only used to fix the circuit breaker, but also serves as a heat conduction path, transferring the heat generated by the circuit breaker to the heat sink 3 through the heat dissipation fastening bolt 2.

[0045] The selection of materials for the heat dissipation fastening bolt 2 and the heat sink 3 needs to comprehensively consider thermal conductivity, cost, weight, processing difficulty, and environmental adaptability. For example: copper alloy, with high thermal conductivity (approximately 380~400 W / m·K); aluminum alloy, with moderate thermal conductivity (approximately 200~250 W / m·K); copper-aluminum composite materials, combining the high thermal conductivity of copper and the lightweight advantages of aluminum, can achieve efficient heat dissipation through composite processes (such as copper tubes embedded in aluminum fins); graphene / carbon nanotube composite materials have ultra-high thermal conductivity (theoretical value of graphene reaches 5300 W / m·K), are lightweight, and are suitable for extreme heat dissipation requirements.

[0046] If the circuit breaker casing temperature is 80℃, the circuit breaker casing temperature can be reduced by 5~10℃ through the conduction of the copper heat dissipation fastening bolt 2 and heat sink 3 (the specific effect depends on the area of ​​heat sink 3 and environmental conditions).

[0047] The design of rectangular frame 1 must balance structural stability, installation adaptability, and functional requirements. Rectangular frame 1 is an open frame, composed of a top edge strip, a bottom edge strip, and two side edge strips, forming a hollow rectangular cavity. Longitudinal or transverse stiffeners are added to the top and bottom edge strips to enhance structural strength and prevent deformation.

[0048] Adjacent top, bottom, and side strips can be connected using corner brackets. For example, pre-drill holes at the connection point between the top and side strips. Insert the L-shaped corner bracket into the holes and secure it with bolts or self-tapping screws. Reinforcement (such as adding washers or double nuts) can be used to improve stability.

[0049] Adjacent top, bottom, and side strips can also be secured with fasteners via slots at their ends that mate with plugs (or cutouts) on the other side. For example, slots can be machined into the ends of the side strips. The top strip can then be inserted into the slots of the side strips. Alternatively, bolts or built-in connectors (such as hex socket head cap screws) can be used to secure them together.

[0050] Adjacent top edge strips, bottom edge strips, and side edge strips can also be directly welded together by electric welding or argon arc welding.

[0051] Multiple threaded holes are provided on one side of the frame (e.g., the right side) for installing heat dissipation fastening bolts 2.

[0052] The spacing between two adjacent threaded holes, as well as the distance between the edge of the threaded hole and the edge of the rectangular frame 1, must be greater than 1.5 times the thread diameter (e.g., the distance between the edge of an M6 threaded hole and the edge of the frame ≥ 9mm) to avoid stress concentration or structural weakening.

[0053] Multiple threaded holes are evenly distributed, ensuring that the multiple heat dissipation fastening bolts 2 evenly clamp the circuit breaker housing, avoiding localized stress concentration. Tightening the heat dissipation fastening bolts 2 one by one also reduces installation errors. Most importantly, the heat dissipation fastening bolts 2 make even contact with the circuit breaker housing with the heat sink 3, ensuring that heat is quickly conducted to the heat sink 3.

[0054] In one embodiment, a heat sink 3 is provided on the head of the heat-dissipating fastening bolt 2. Heat is conducted to the bolt head through the screw and then dissipated by the heat sink 3. The heat sink 3 is directly mounted on the bolt head, typically welded to it. The heat sink 3 is close to the bolt head, resulting in a compact overall structure suitable for space-constrained applications. This solution can be selected when equipment space is limited and heat dissipation requirements are not high (such as household appliances, small controllers 42).

[0055] In another embodiment, a heat sink 3 is provided on the threaded section of the heat dissipation fastening bolt 2 near its head. The heat sink 3 is mounted on the threaded section near the bolt head, typically fixed by welding or threaded connection. When the heat sink 3 is connected to the threaded section of the heat dissipation fastening bolt 2 via a threaded connection, the heat dissipation effect can be adjusted by changing the number of heat sinks 3 mounted on each thread, the spacing between two adjacent heat sinks 3, and by replacing heat sinks 3 with those of different areas. This solution can be selected when the equipment power is high (such as industrial motors, servers) or the ambient temperature is high.

[0056] The heat dissipation device also includes an intelligent auxiliary heat dissipation system 4; the intelligent auxiliary heat dissipation system 4 is installed on the rectangular frame 1 and is used to automatically activate after detecting that the circuit breaker temperature has reached a preset temperature, so as to dissipate heat and cool the circuit breaker. The design goal of the intelligent auxiliary heat dissipation system 4 is to monitor the circuit breaker temperature in real time and automatically activate the heat dissipation mechanism when the temperature exceeds a preset threshold, thereby ensuring the stable operation of the circuit breaker.

[0057] Specifically, the intelligent auxiliary heat dissipation system 4 includes: a fan 41, a controller 42, a power supply, and a temperature detection module 43; the controller 42 is electrically connected to the fan 41, the power supply, and the temperature detection module 43; the air delivery end of the fan 41 faces the interior of the rectangular frame 1; the temperature detection module 43 is located near the circuit breaker. The air delivery end of the fan 41 faces the interior of the rectangular frame 1, forming forced convection, blowing towards the circuit breaker, and dissipating heat from the circuit breaker area.

[0058] The working process of the intelligent auxiliary heat dissipation system 4 is as follows:

[0059] 1. Temperature detection module 43 collects the temperature data T of the circuit breaker in real time, and transmits the temperature data T to controller 42.

[0060] 2. The controller 42 receives the real-time temperature data T from the temperature detection module 43 and compares it with the preset temperature thresholds (such as T1=60℃, T2=75℃, T3=90℃) in the controller 42.

[0061] In low temperature mode (T ≤ T1): fan 41 is turned off, and cooling relies solely on natural convection.

[0062] Medium temperature mode (T1 < T ≤ T2): Start the fan at low speed (30% duty cycle).

[0063] High temperature mode (T2 < T ≤ T3): Fan runs at medium speed (60% duty cycle) at 41, and heat exchanger is activated to assist in heat dissipation.

[0064] Emergency mode (T > T3): Fan 41 runs at full speed (duty cycle 100%), and can also trigger a buzzer alarm.

[0065] The preset temperature values ​​of T1, T2 and T3 mentioned above are for illustrative purposes. In practical applications, specific temperature thresholds can be set in the controller 42 according to specific needs.

[0066] The temperature detection module 43 can be a temperature sensor (such as DS18B20 or NTC thermistor). The controller 42 can be a microcontroller (such as STC89C52 or STM32) or an embedded chip, responsible for data processing and logic control.

[0067] The power supply can be directly connected to household or industrial power supplies, and the switching power supply module can convert 220V / 380V input to 5V / 12V output.

[0068] In one embodiment, the intelligent auxiliary heat dissipation system 4 further includes a mounting bracket 44; the mounting bracket 44 is disposed on the other side of the rectangular frame 1; the fan 41 is mounted on the mounting bracket 44, such that the air delivery end of the fan 41 faces the other side of the rectangular frame 1; and a ventilation hole 5 is also provided on the other side of the rectangular frame 1.

[0069] The surface of the mounting bracket 44 can be anodized or painted to enhance its corrosion resistance. The mounting bracket 44 has embedded reinforcing ribs to improve its bending resistance and prevent deformation caused by vibration during the operation of the fan 41.

[0070] The mounting bracket 44 is U-shaped, with both ends fixed to the sides of the rectangular frame 1 (through integral molding, welding, or fasteners), and the middle section is used to mount the fan 41. Rubber pads or silicone buffer blocks are pre-placed at the contact points between the mounting bracket 44 and the fan 41 to reduce the risk of vibration transmission to the rectangular frame 1.

[0071] In one embodiment, the temperature detection module 43 is disposed at the end of the heat dissipation fastening bolt 2 away from its head. Specifically, the end of the heat dissipation fastening bolt 2 away from its head is provided with a mounting groove; the temperature detection module 43 is disposed in the mounting groove.

[0072] Temperature detection modules 43 can be installed on one or more (at least two) heat dissipation fastening bolts 2. This enables real-time and accurate monitoring of the temperature at different locations on the circuit breaker. This multi-point temperature monitoring mechanism not only improves the accuracy of temperature data acquisition but also effectively identifies whether there is local overheating inside the circuit breaker, thus providing a reliable basis for the precise control of the intelligent auxiliary heat dissipation system 4.

[0073] The mounting slot is located at the tail end of the heat dissipation fastening bolt 2, which is the position where it makes the closest contact with the circuit breaker, so as to accurately measure the temperature at that point. The mounting slot is customized according to the size of the selected temperature detection module 43, and is generally a small cylindrical or square groove to ensure that the temperature detection module 43 is securely installed without affecting the overall strength of the bolt.

[0074] The temperature detection module 43 is embedded in the mounting slot and fixed with thermally conductive adhesive or a special adhesive to ensure good heat conduction. To protect the temperature detection module 43 from external interference, a thin layer of insulating and thermally conductive material (such as a silicone grease pad) can be placed on top of it before sealing the mounting slot.

[0075] The temperature detection module 43 needs to be connected to the controller 42. This typically involves a thin but strong wire passing through a pre-drilled channel inside a bolt to an external terminal block, and then connecting the controller 42 to the terminal block via a circuit.

[0076] Although the specific circuit connection between the temperature sensor and the controller is not described in detail in this technical solution, this is because such a connection is a technical aspect that can be routinely implemented by those skilled in the art based on the actual temperature sensor (such as DS18B20 or NTC thermistor) and controller (such as STC89C52, STM32) models used. The temperature detection module is connected to the controller through a standard interface, and the circuit involved mainly involves basic circuit designs such as power supply lines and signal transmission lines, which can be configured according to the datasheets of the selected components. Furthermore, the connection between the controller and the fan also follows the basic principles of electrical control, adjusting the fan's operating state through control signal lines. Therefore, even without a specific circuit diagram, those skilled in the art can understand how to implement this technical solution to achieve intelligent control of the circuit breaker temperature and the heat dissipation device. Even without a circuit diagram, this solution remains clear and straightforward.

[0077] Example 2

[0078] A circuit breaker includes a circuit breaker body and a universal external heat dissipation device for the circuit breaker as described in Embodiment 1 above; the circuit breaker body is disposed within the rectangular frame 1; after the heat dissipation fastening bolt 2 is screwed into the threaded hole, one end of the heat dissipation fastening bolt 2 away from its head abuts against the outside of the circuit breaker body.

[0079] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0080] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0081] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A universal external heat dissipation device for circuit breakers, characterized in that, include: A rectangular frame (1), heat dissipation fastening bolts (2), and heat sink (3); The frame has multiple threaded holes on one side, and each threaded hole is screwed into a heat dissipation fastening bolt (2); Each of the heat dissipation fastening bolts (2) has a heat sink (3) at one end away from the rectangular frame (1).

2. The universal external heat dissipation device for a circuit breaker according to claim 1, characterized in that, The heat sink (3) is provided on the head of the heat dissipation fastening bolt (2).

3. The universal external heat dissipation device for a circuit breaker according to claim 1, characterized in that, The heat dissipation fastening bolt (2) has a heat dissipation fin (3) on the screw near its head.

4. A universal external heat dissipation device for a circuit breaker according to claim 1, characterized in that, The multiple threaded holes are evenly distributed.

5. A universal external heat dissipation device for a circuit breaker according to any one of claims 1 to 4, characterized in that, It also includes an intelligent auxiliary heat dissipation system (4); The intelligent auxiliary heat dissipation system (4) is installed on the rectangular frame (1) and is used to automatically open after detecting that the temperature of the circuit breaker has reached the preset temperature, so as to dissipate heat and cool down the circuit breaker.

6. A universal external heat dissipation device for a circuit breaker according to claim 5, characterized in that, The intelligent auxiliary heat dissipation system (4) includes: a fan (41), a controller (42), a power supply and a temperature detection module (43); The controller (42) is electrically connected to the fan (41), the power supply and the temperature detection module (43); The air delivery end of the fan (41) faces the interior of the rectangular frame (1); The temperature detection module (43) is located near the circuit breaker.

7. A universal external heat dissipation device for a circuit breaker according to claim 6, characterized in that, The intelligent auxiliary heat dissipation system (4) also includes a mounting bracket (44); The mounting bracket (44) is located on the other side of the rectangular frame (1); The fan (41) is mounted on the mounting bracket (44) with the air delivery end of the fan (41) facing the other side of the rectangular frame (1); A ventilation hole (5) is also provided on the other side of the rectangular frame (1).

8. A universal external heat dissipation device for a circuit breaker according to claim 6, characterized in that, The temperature detection module (43) is provided at the end of the heat dissipation fastening bolt (2) away from its head.

9. A universal external heat dissipation device for a circuit breaker according to claim 8, characterized in that, The heat dissipation fastening bolt (2) has a mounting groove at the end away from its head; The temperature detection module (43) is installed in the mounting slot.

10. A circuit breaker, characterized in that, Includes the circuit breaker body and a universal external heat dissipation device for the circuit breaker as described in any one of claims 1 to 9; The circuit breaker body is disposed within the rectangular frame (1); After the heat dissipation fastening bolt (2) is screwed into the threaded hole, the end of the heat dissipation fastening bolt (2) away from its head abuts against the outside of the circuit breaker body.

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