A small dc power supply circuit breaker device

Abstract

This utility model relates to the technical field of miniature DC protection circuit breakers and discloses a miniature DC protection circuit breaker device, including a circuit breaker housing. A rectangular through groove communicating with the interior is opened on the lower surface of the circuit breaker housing, and two rectangular slots are opened on the upper surface of the circuit breaker housing. A heat dissipation assembly is provided on the circuit breaker housing. The heat dissipation assembly includes a heat dissipation mounting base plate. Through the mutual cooperation between the rectangular plate, the rectangular slots, two first threaded holes, two second threaded holes, and the fixing screw, the sealing plate can be quickly installed and removed, which not only ensures the sealing performance during operation but also facilitates maintenance. Through the combination of a fan, heat sink, and ventilation holes, and the dust filter design, the heat dissipation structure can efficiently dissipate the working heat of the circuit breaker and prevent dust corrosion, ensuring the stable operation of the equipment in DC protection scenarios. The overall design takes into account heat dissipation performance, protection effect, and ease of operation.

Description

Technical Field

[0001] This utility model relates to the technical field of miniature DC protection circuit breakers, specifically a miniature DC protection circuit breaker device. Background Technology

[0002] Miniature DC circuit breakers are key protection devices for DC power supply systems. Their core requirements are efficient heat dissipation, reliable sealing, and convenient maintenance. When the equipment is running, the internal circuit components will generate heat due to the current passing through them. This heat must be dissipated in time to avoid overheating and failure of the protection function.

[0003] However, the existing small DC protection circuit breaker equipment in the industry currently relies solely on passive heat sinks for heat dissipation and lacks an active airflow circulation structure. Heat tends to accumulate inside, and the temperature is prone to exceeding the safety threshold, especially under high load scenarios, leading to circuit breaker malfunctions or shortened lifespan. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a small DC protection circuit breaker device, which solves the problem that existing small DC protection circuit breaker devices in the industry rely solely on passive heat sinks for heat dissipation and lack an active airflow circulation structure. As a result, heat tends to accumulate inside, and the temperature easily exceeds the safety threshold, especially under high load scenarios, leading to circuit breaker malfunctions or shortened lifespan.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a small DC protection circuit breaker device, including a circuit breaker housing, a rectangular through groove communicating with the interior of the circuit breaker housing on the lower surface of the circuit breaker housing, two rectangular slots on the upper surface of the circuit breaker housing, a heat dissipation assembly on the circuit breaker housing, the heat dissipation assembly including a heat dissipation mounting base plate, the heat dissipation mounting base plate being fixedly connected to the bottom of the circuit breaker housing, and the heat dissipation mounting base plate being used for the installation of the internal structure of the circuit breaker housing;

[0008] The heat dissipation mounting base plate has multiple first ventilation holes, and multiple heat sinks are fixedly connected to the lower surface of the heat dissipation mounting base plate.

[0009] The lower ends of multiple heat sinks extend through the inner wall of a rectangular through slot, and multiple heat sinks are provided with second ventilation holes.

[0010] Preferably, a rectangular cover is fixedly connected to the lower surface of the circuit breaker housing, and the lower surfaces of multiple heat sinks are all in contact with the bottom of the inside of the circuit breaker housing;

[0011] The rectangular cover has an air inlet box that communicates with its interior on the right side and an exhaust box that communicates with its interior on the left side. The exhaust box is equipped with a dustproof net.

[0012] Preferably, the front surface of the rectangular cover is connected to an exhaust fan heat mounting box, an exhaust fan is fixedly installed inside the exhaust fan heat mounting box, and a dust filter screen is fixedly installed inside the exhaust fan heat mounting box.

[0013] Preferably, the right side of the exhaust fan heat installation box is fixedly connected to an air supply pipe that communicates with its interior, and the end of the air supply pipe away from the exhaust fan heat installation box is fixedly connected to the front surface of the air inlet box.

[0014] The gas supply pipe is connected to the interior of the air inlet box.

[0015] Preferably, the inner walls of both rectangular slots are fitted with rectangular plates, and the front surfaces of both rectangular plates are provided with second threaded holes.

[0016] Preferably, the front surface of the circuit breaker housing has two first threaded holes, and the two first threaded holes communicate with the interior of the corresponding rectangular slots;

[0017] Each of the two first threaded holes is provided with a fixing screw on its front side, and the rear ends of the two fixing screws are respectively rotated and penetrated into the inner wall of the corresponding first threaded hole and second threaded hole.

[0018] Preferably, a rectangular sleeve is fixedly connected to the upper surface of the two rectangular plates, a sealing plate is fixedly connected to the inner wall of the rectangular sleeve, and the lower end of the sealing plate is slidably connected to the inner wall of the circuit breaker housing.

[0019] Preferably, two rectangular plates are fixedly connected to the upper surface of the sealing plate. The front surface of each of the two rectangular plates is provided with a screw placement groove. A magnet is provided inside each screw placement groove. The two screw placement grooves are used to place the two screws.

[0020] Handles are fixedly connected to the upper surface of both rectangular plates.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, this utility model provides a small DC protection circuit breaker device, which has the following beneficial effects:

[0023] The sealing plate can be quickly installed and removed through the cooperation of rectangular card plate, rectangular card slot, two first threaded holes, two second threaded holes and fixing screws, which not only ensures the sealing performance during operation, but also facilitates maintenance. The heat dissipation structure of exhaust fan, heat sink and ventilation holes, combined with dust filter design, can not only efficiently dissipate the heat of the circuit breaker, but also prevent dust corrosion, ensuring the stable operation of the equipment in DC protection scenarios. The overall design takes into account heat dissipation performance, protection effect and operation convenience, thereby improving the practicality and reliability of small DC protection circuit breaker equipment. Multiple first ventilation holes on the heat dissipation mounting plate can make the hot air inside the circuit breaker and the cold air near the heat sink convection, improving heat dissipation efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the miniature DC protection circuit breaker device of this utility model;

[0025] Figure 2 This is a schematic diagram of the gas transmission pipe of this utility model;

[0026] Figure 3 This is a schematic diagram of the second threaded hole of this utility model;

[0027] Figure 4 This is a schematic diagram of the rectangular through groove of this utility model.

[0028] In the diagram: 1. Circuit breaker housing; 2. Rectangular plate; 3. Rectangular sleeve; 4. Sealing plate; 5. Fixing screw placement slot; 6. Exhaust box; 7. Exhaust fan hot mounting box; 8. Rectangular cover; 9. Gas supply pipe; 10. Air inlet box; 11. First threaded hole; 12. Rectangular slot; 13. Rectangular plate; 14. First ventilation hole; 15. Second threaded hole; 16. Heat dissipation mounting base plate; 17. Second ventilation hole; 18. Rectangular through slot; 19. Heat sink. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-4This utility model provides a new technical solution: a small DC protection circuit breaker device, including a circuit breaker housing 1: the circuit breaker housing 1 is the core load-bearing frame of the small DC protection circuit breaker device. The circuit breaker housing 1 provides a closed installation space for the internal circuit components and heat dissipation components. At the same time, the sealing plate 4 is positioned by the cooperation of the rectangular slot 12 and the rectangular plate 13. The sealing plate 4 is fixed by the cooperation of the first threaded hole 11 and the fixing screw, so as to prevent external dust and moisture from entering the interior and affecting the performance of the components.

[0031] Rectangular sleeve 3: Rectangular sleeve 3 is used to connect rectangular card plate 13 and sealing plate 4, so that rectangular card plate 13 and sealing plate 4 move synchronously, ensuring that when sealing plate 4 is inserted into rectangular card slot 12 along with rectangular card plate 13, it can accurately cover the top opening of circuit breaker housing 1, avoiding seal offset.

[0032] Rectangular plate 13: The rectangular plate 13 provides initial positioning for the sealing plate 4 by engaging with the rectangular slot 12. It also engages with the fixing screw through the second threaded hole 15 to firmly fix the sealing plate 4 to the top of the circuit breaker housing 1, while facilitating subsequent disassembly and maintenance.

[0033] Fixing screw: The fixing screw is used to fix the rectangular clamping plate 13 to the circuit breaker housing 1, thereby locking the position of the sealing plate 4 and preventing the sealing plate 4 from loosening during equipment operation. When disassembling, simply twist it in the opposite direction to achieve quick installation and removal of the sealing plate 4.

[0034] Heat dissipation mounting base 16: Multiple heat sinks 19 are fixedly connected to the lower surface of the heat dissipation mounting base 16. The heat dissipation mounting base 16 has both mounting and heat dissipation functions. On the one hand, it serves as a mounting carrier for internal circuit components to ensure that the components are fixed in position. On the other hand, it conducts the heat generated by the components to the heat sinks 19. The first ventilation hole 14 can promote air convection inside the circuit breaker housing 1 and assist in heat dissipation.

[0035] Heat sink 19: Multiple heat sinks 19 are provided with second ventilation holes 17. The heat sink 19 is the core heat dissipation component of the equipment. By increasing the contact area with the air, the heat conducted by the heat dissipation mounting base plate 16 is quickly diffused into the airflow. The second ventilation holes 17 can make the airflow pass through the gaps of the heat sink 19 to form turbulence, further improving the heat exchange efficiency and avoiding heat accumulation.

[0036] Rectangular cover 8: The rectangular cover 8 is used to gather airflow, so that outside air can only enter through the air inlet box 10 and exit through the exhaust box 6, ensuring that all airflow flows through the heat sink 19, avoiding airflow dispersion that would reduce heat dissipation efficiency, and protecting the heat sink 19 from damage by external impact.

[0037] Air inlet box 10: The air inlet box 10 is used to receive the airflow delivered by the air supply pipe 9 and to evenly guide the airflow into the rectangular cover 8, providing a continuous source of cooling airflow for the heat sink 19 and ensuring that the heat sink 19 can continuously contact the cold air.

[0038] Exhaust box 6: Exhaust box 6 is used to exhaust the hot airflow after absorbing heat from the equipment. At the same time, the dustproof net on exhaust box 6 can block large particles of impurities from entering the rectangular cover 8 through exhaust box 6, so as to avoid clogging the gap of heat sink 19 and affecting the heat dissipation effect.

[0039] Exhaust fan hot mounting box 7: The exhaust fan inside the exhaust fan hot mounting box 7 is the power source for airflow circulation. It forms airflow circulation by suction. The dust filter can filter fine dust in the airflow and prevent dust from adhering to the surface of the heat sink 19 and affecting heat dissipation.

[0040] Air supply pipe 9: The air supply pipe 9 is connected to the interior of the air inlet box 10. As an airflow delivery channel, the air supply pipe 9 ensures that the negative pressure generated by the exhaust fan can stably guide the airflow from the exhaust fan hot mounting box 7 into the air inlet box 10, forming a complete airflow circulation path of exhaust fan hot mounting box 7 → air supply pipe 9 → air inlet box 10 → rectangular cover 8 → exhaust box 6 → exhaust fan hot mounting box 7.

[0041] Furthermore, when using this small DC protection circuit breaker device, the sealing plate 4 must first be installed and fixed. The two rectangular plates 13 are inserted into the two rectangular slots 12 on the upper surface of the circuit breaker housing 1. At this time, the sealing plate 4 will move down synchronously with the rectangular plates 13, and its lower end will slide against the inner wall of the circuit breaker housing 1 to achieve sealing protection of the internal structure of the circuit breaker. Then, the fixing screw is taken out and its rear end is passed through the first threaded hole 11 on the front surface of the circuit breaker housing 1 and the second threaded hole 15 of the rectangular plate 13 in sequence. After tightening the fixing screw, the rectangular plate 13 is firmly connected to the rectangular slot 12, thereby making the sealing plate 4 stably cover the top of the circuit breaker housing 1 to prevent external dust and moisture from entering the interior through the top gap and affecting the circuit components.

[0042] When the circuit breaker is powered on, the heat dissipation components start working simultaneously. The exhaust fan in the exhaust fan heat installation box 7 starts running and delivers airflow to the air inlet box 10 through the air supply pipe 9. Outside air enters the rectangular cover 8 through the air inlet box 10. The rectangular cover 8 concentrates the airflow and guides it to multiple heat sinks 19 on the lower surface of the heat dissipation mounting base plate 16. The heat sinks 19, through their tight connection with the heat dissipation mounting base plate 16, quickly conduct the heat generated by the internal components of the circuit breaker to themselves. When the airflow flows through the heat sinks 19, it forms turbulence through the second ventilation holes 17 on the heat sinks 19, increasing the contact area with the heat sinks 19 and accelerating heat exchange. At the same time, the multiple first ventilation holes 14 on the heat dissipation mounting base plate 16 can cause the hot air inside the circuit breaker to form convection with the cold air near the heat sinks 19, further improving the heat dissipation efficiency.

[0043] The hot airflow, after absorbing heat, flows to the left under the suction of the exhaust fan and is eventually discharged outside the equipment through the exhaust box 6. The dustproof net on the exhaust box 6 and the dust filter in the exhaust fan hot mounting box 7 work together. The dustproof net blocks large particles of impurities from entering the rectangular cover 8, while the dust filter filters fine dust in the airflow, preventing dust from adhering to the surface of the heat sink 19 and affecting the heat dissipation effect. This ensures that the heat dissipation components work stably for a long time and prevents the circuit breaker from failing due to overheating.

[0044] If it is necessary to inspect and maintain the internal components of the circuit breaker, the following steps can be taken: First, unscrew the two fixing screws and place them into the fixing screw placement slots 5 on the front surface of the two rectangular plates 2 respectively. The magnets in the placement slots will attract the fixing screws to prevent them from being lost. Then, hold the handles on the upper surface of the two rectangular plates 2 and pull them upwards, which will move the sealing plate 4 and the rectangular clamping plate 13 upwards simultaneously, so that the rectangular clamping plate 13 is disengaged from the rectangular clamping slot 12. The top of the circuit breaker can then be opened for internal operations. After the inspection and maintenance are completed, the sealing plate 4 can be reinstalled by reversing the operation. The whole process does not require special tools, is easy to operate, and greatly shortens the maintenance time.

[0045] The rectangular card plate 13, rectangular card slot 12, two first threaded holes 11, two second threaded holes 12, and fixing screws work together to enable quick installation and removal of the sealing plate, ensuring sealing during operation and facilitating maintenance. The combined heat dissipation structure of the exhaust fan, heat sink 19, and ventilation holes, along with the dust filter design, efficiently dissipates the working heat of the circuit breaker and prevents dust corrosion, ensuring stable operation of the equipment in DC protection scenarios. The overall design takes into account heat dissipation performance, protection effect, and ease of operation, thereby improving the practicality and reliability of the small DC protection circuit breaker equipment.

[0046] Example 1: Replacing the original heat sink with a thermally enhanced heat sink 19

[0047] A DC power distribution device next to a photovoltaic inverter is located in an area where the ambient temperature often exceeds 40°C. The original heat sink 19 has slow heat conduction, and the use of the original heat sink 19 has exposed the following problems: First, the high ambient temperature combined with the self-heating of the equipment results in insufficient heat conduction efficiency of the heat sink, and the internal temperature of the circuit breaker is prone to exceeding the safety value. Second, the heat cannot be dissipated, which leads to a slow response of the protection function and poses a safety hazard. Third, the long-term high temperature causes the connection between the heat sink and the substrate to loosen, further reducing the heat dissipation effect. At this time, the original heat sink 19 is replaced with a heat-enhanced heat sink. The heat-enhanced heat sink is made of copper-aluminum composite material, with a copper layer at the bottom to enhance heat conduction and an aluminum layer at the top for easy heat dissipation. The surface is decorated with fine corrugated protrusions, and the second ventilation hole structure is retained.

[0048] The copper layer rapidly conducts heat from the equipment to the aluminum layer, improving thermal conductivity in high-temperature environments and keeping the internal temperature of the circuit breaker within a safe range. This makes it suitable for high-temperature photovoltaic scenarios and prevents overheating from affecting the protection function.

[0049] The corrugated structure increases the contact area with air, and with the airflow from the second ventilation hole, heat dissipation is faster. No additional equipment is required, making it suitable for compact installation spaces and simplifying the heat dissipation structure.

[0050] Example 2: Replacing the original heat sink with a lightweight, impact-resistant heat sink 19

[0051] A certain outdoor temporary DC power supply equipment needs to be moved frequently. The original heat sink 19 is bulky and easily deformed by bumps. There are three problems with using the original heat sink 19: First, the weight of the heat sink increases the difficulty of the overall portability of the equipment. Second, collisions during transportation can easily cause the heat sink to deform and block the ventilation holes. Third, after deformation, it does not fit tightly with the substrate, interrupting heat conduction and causing the equipment to overheat and shut down. At this time, the original heat sink 19 is replaced with a lightweight impact-resistant heat sink. The lightweight impact-resistant heat sink is made of aviation aluminum alloy, with thin edges and rounded corners. Horizontal reinforcing ribs are added between the heat sinks.

[0052] The thin structure allows the heat sink to fit more tightly to the substrate, resulting in a shorter heat conduction path. Even after transportation, there are no gaps in the fit, ensuring stable heat dissipation and meeting the continuous power supply requirements of mobile devices.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small DC protection circuit breaker device, comprising a circuit breaker housing (1), characterized in that: The lower surface of the circuit breaker housing (1) is provided with a rectangular through groove (18) communicating with its interior. The upper surface of the circuit breaker housing (1) is provided with two rectangular slots (12). A heat dissipation assembly is provided on the circuit breaker housing (1). The heat dissipation assembly includes a heat dissipation mounting base plate (16). The heat dissipation mounting base plate (16) is fixedly connected to the bottom of the circuit breaker housing (1). The heat dissipation mounting base plate (16) is used for the installation of the internal structure of the circuit breaker housing (1). The heat dissipation mounting base (16) has multiple first ventilation holes (14) and multiple heat sinks (19) are fixedly connected to the lower surface of the heat dissipation mounting base (16). Among them, the lower ends of multiple heat sinks (19) penetrate through the inner wall of the rectangular through slot (18), and multiple heat sinks (19) are provided with second ventilation holes (17).

2. The miniature DC protection circuit breaker device according to claim 1, characterized in that: A rectangular cover (8) is fixedly connected to the lower surface of the circuit breaker housing (1), and the lower surfaces of multiple heat sinks (19) are all in contact with the bottom of the inside of the circuit breaker housing (1). The rectangular cover (8) is fixedly connected to an air inlet box (10) that communicates with its interior on the right side, and to an exhaust box (6) that communicates with its interior on the left side. A dustproof net is installed on the exhaust box (6).

3. A miniature DC protection circuit breaker device according to claim 2, characterized in that: The front surface of the rectangular cover (8) is connected to the exhaust fan heat installation box (7), the exhaust fan is fixedly installed inside the exhaust fan heat installation box (7), and a dust filter is fixedly installed inside the exhaust fan heat installation box (7).

4. A miniature DC protection circuit breaker device according to claim 3, characterized in that: The right side of the exhaust fan heat installation box (7) is fixedly connected to an air supply pipe (9) that communicates with its interior. The end of the air supply pipe (9) away from the exhaust fan heat installation box (7) is fixedly connected to the front surface of the air inlet box (10). The gas supply pipe (9) is connected to the interior of the air inlet box (10).

5. A miniature DC protection circuit breaker device according to claim 1, characterized in that: The inner walls of the two rectangular slots (12) are each fitted with a rectangular card plate (13), and the front surface of the two rectangular card plates (13) is provided with a second threaded hole (15).

6. A miniature DC protection circuit breaker device according to claim 1, characterized in that: The front surface of the circuit breaker housing (1) has two first threaded holes (11), and the two first threaded holes (11) are respectively connected to the interior of the corresponding rectangular slots (12); Among them, the front side of the two first threaded holes (11) is provided with a fixing screw, and the rear end of the two fixing screws respectively rotates through into the inner wall of the corresponding first threaded hole (11) and second threaded hole (15).

7. A miniature DC protection circuit breaker device according to claim 5, characterized in that: A rectangular sleeve (3) is fixedly connected to the upper surface of the two rectangular plates (13), and a sealing plate (4) is fixedly connected to the inner wall of the rectangular sleeve (3). The lower end of the sealing plate (4) is slidably connected to the inner wall of the circuit breaker housing (1).

8. A miniature DC protection circuit breaker device according to claim 7, characterized in that: The upper surface of the sealing plate (4) is fixedly connected to two rectangular plates (2). The front surface of the two rectangular plates (2) is provided with a fixing screw placement groove (5). The inside of the two fixing screw placement grooves (5) is provided with a magnet. The two fixing screw placement grooves (5) are used to place the two fixing screws. Handles are fixedly connected to the upper surfaces of the two rectangular plates (2).

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