Heat dissipation structure and circuit breaker

Abstract

This utility model discloses a heat dissipation structure, relating to the field of circuit breaker heat dissipation technology. It includes a base plate, a housing, and electrical connection assemblies. The base plate has a first heat dissipation hole, and the housing is fixedly mounted on the base plate. Each electrical connection assembly includes an upper support plate, a lower support plate, and two electrical connecting plates. The two connecting plates are connected to a terminal block and are connected via a guide plate. The bottom of the lower housing has a second heat dissipation hole, the lower support plate has a third heat dissipation hole, the two electrical connecting plates have a fourth and a fifth heat dissipation hole respectively, the upper support plate has a sixth heat dissipation hole, a partition is provided between the upper and lower housings, the partition has a seventh heat dissipation hole, and the top of the upper housing has an eighth heat dissipation hole. Airflow can sequentially pass through the first heat dissipation hole to the eighth heat dissipation hole. This utility model also discloses a circuit breaker, including a terminal block and the heat dissipation structure described above. This utility model can achieve active heat dissipation and reduce the occurrence of thermal hysteresis.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker heat dissipation technology, and in particular to a heat dissipation structure and a circuit breaker. Background Technology

[0002] Electrical connection groups are common heat-generating elements in circuit breaker structures. Currently, heat dissipation in circuit breaker structures is mostly passive, i.e., adding additional heat sinks. However, these additional heat sinks need to be connected to the internal electrical connection groups (such as copper busbars and terminals) via bolts or welding. Material gaps inevitably exist at the contact surfaces (which cannot be completely eliminated even with grinding), creating interfacial thermal resistance. This prevents heat from being quickly transferred from the heat source (electrical connection group) to the heat sink, resulting in thermal stagnation where the heat source is locally overheated and the heat sink temperature is too low. Furthermore, additional heat sinks (especially finned heat sinks) occupy space in the circuit breaker housing. To ensure sufficient heat dissipation area, the height and spacing of the fins require additional space. Circuit breakers have a wide range of applications, from household distribution boxes to industrial distribution cabinets and integrated systems in new energy power plants, all of which have strict requirements for space utilization. The assembly and installation of additional heat sinks present certain challenges. Therefore, a heat dissipation structure and circuit breaker are urgently needed to solve the aforementioned technical problems. Utility Model Content

[0003] The purpose of this invention is to provide a heat dissipation structure and circuit breaker to solve the problems existing in the prior art, enabling active heat dissipation and reducing the occurrence of thermal hysteresis.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a heat dissipation structure, including a base plate, a housing, and electrical connection assemblies. The base plate has a first heat dissipation hole. The housing is fixedly mounted on the base plate and includes an upper housing and a lower housing. The upper housing and the lower housing are respectively used to fix a terminal block. Each electrical connection assembly includes an upper support plate, a lower support plate, and two electrical connecting pieces. The two electrical connecting pieces are connected to one terminal block. The upper support plate is fixedly connected to one electrical connecting piece, and the lower support plate is fixedly connected to the other electrical connecting piece. The two electrical connecting pieces are connected via a guide plate. The bottom of the lower housing has a second heat dissipation hole, and the lower support plate has a third heat dissipation hole. The two electrical connecting pieces are... The upper support plate is provided with a fourth and a fifth heat dissipation hole, the upper support plate is provided with a sixth heat dissipation hole, a partition plate is provided between the upper shell and the lower shell, the partition plate is provided with a seventh heat dissipation hole, and the top of the upper shell is provided with an eighth heat dissipation hole. The first, second, third, fourth, fifth, sixth, seventh, and eighth heat dissipation holes are aligned in the height direction, and the airflow can pass through the first, second, third, fourth, fifth, sixth, seventh, and eighth heat dissipation holes in sequence.

[0005] In some embodiments, the first heat dissipation hole, the second heat dissipation hole, the third heat dissipation hole, the fourth heat dissipation hole, the fifth heat dissipation hole, the sixth heat dissipation hole, the seventh heat dissipation hole, and the eighth heat dissipation hole are all elongated holes.

[0006] In some embodiments, the bottom of the lower housing is further provided with a first air intake groove, which is located between the lower housing and the base plate, and is located on the back of the lower housing. The first air intake groove communicates with the second heat dissipation hole.

[0007] In some embodiments, a second air inlet groove is provided on the back of the partition, and the second air inlet groove is connected to the seventh heat dissipation hole.

[0008] In some embodiments, the electrical connector includes a connecting segment, an arc segment, and a wiring segment that are fixedly connected in sequence. The connecting segment is used to connect to the guide plate, and the wiring segment is used to connect to the terminal block. The arc segment has a plurality of fourth heat dissipation holes along its length direction, and the arc segment has an arc-shaped heat dissipation groove along its width direction.

[0009] In some embodiments, the upper support plate includes a first guide portion, a first fastening portion, and a first mounting portion that are fixedly connected in sequence. The first guide portion is provided with a plurality of first guide holes for fixing with a guide plate. The first fastening portion is provided with a plurality of first fastening holes for fixing with a terminal block. The first mounting portion is provided with a plurality of first mounting holes for fixing with the housing. The first guide portion and the first fastening portion are provided with the sixth heat dissipation hole.

[0010] In some embodiments, the lower support plate includes a second guide portion, a second fastening portion, and a second mounting portion that are fixedly connected in sequence. The second guide portion is provided with a plurality of second guide holes for fixing with a guide plate. The second fastening portion is provided with a plurality of second fastening holes for fixing with a terminal block. The second mounting portion is provided with a plurality of second mounting holes for fixing with the housing. The second guide portion and the second fastening portion are provided with the third heat dissipation hole.

[0011] In some embodiments, the housing is an insulating housing.

[0012] In some embodiments, the connecting segment is provided with a plurality of partitions, which can divide the connecting segment into a plurality of contact pieces along the length direction, and each contact piece is connected to a guide plate.

[0013] This utility model also provides a circuit breaker, including a terminal block and a heat dissipation structure as described above.

[0014] The present invention achieves the following technical advantages over the prior art: The heat dissipation structure provided by this utility model allows airflow to enter through the first heat dissipation hole in the base plate, then sequentially flow through the bottom of the lower housing (second heat dissipation hole), the lower support plate (third heat dissipation hole), the electrical connectors (fourth and fifth heat dissipation holes), the upper support plate (sixth heat dissipation hole), and the partition plate (seventh heat dissipation hole), finally exiting through the eighth heat dissipation hole at the top of the upper housing. This path completely covers all the key heat-generating components of the electrical connection assembly (support plate, electrical connectors, etc.), allowing the airflow to directly contact the heat source surface and quickly remove heat through convection heat transfer, preventing heat accumulation in localized areas. Because the channels are interconnected and vertically distributed, the air within the channels is heated when the electrical connection assembly heats up, and the hot air naturally rises due to its lower density. The heat dissipation holes are directly located on the core components (support plate, electrical connectors) and the housing structure of the electrical connection assembly. During the heat transfer from the heat source (electrical connection assembly) to the flowing air, there is no need to pass through bolted or welded interfaces, eliminating thermal resistance caused by material gaps and oxide layers. Since the airflow directly washes over the heat-generating components, the heat generated is immediately removed, avoiding the lag phenomenon in traditional solutions where the heat source is already overheated before the radiator has heated up. The heat dissipation holes are all opened on the existing structure (base plate, shell, electrical connection assembly components), and channels are formed by the thickness and gaps of the components themselves. There is no need for outward-extending fins or additional structures. The overall volume is basically the same as that of a circuit breaker without heat dissipation design, which solves the problem of volume expansion caused by traditional heat sinks. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an exploded view of the circuit breaker in some embodiments of the present invention; Figure 2 This is a cross-sectional view of the circuit breaker in some embodiments of the present invention; Figure 3 This is a schematic diagram of the airflow path of the circuit breaker in some embodiments of this utility model; Figure 4 This is a schematic diagram of the front structure of the shell in some embodiments of the present invention; Figure 5 This is a schematic diagram of the back structure of the shell in some embodiments of the present invention; Figure 6 This is a schematic diagram of the electrical connector structure in some embodiments of the present invention; Figure 7 This is a schematic diagram of the upper support plate in some embodiments of the present invention; Figure 8This is a schematic diagram of the lower support plate in some embodiments of the present invention.

[0017] In the diagram: 1-Housing shell; 11-Upper housing; 111-Eighth heat dissipation hole; 12-Lower housing; 121-Second heat dissipation hole; 122-First air intake slot; 13-Baffle plate; 131-Seventh heat dissipation hole; 132-Second air intake slot; 14-Electrical connection cavity; 15-Mounting port; 2-Base plate; 201-First heat dissipation hole; 3-Electrical connection assembly; 301-Electrical connection piece; 3011-Connecting section; 3012-Arc-shaped section; 3013-Wiring section; 3014-Separation seam; 3015-Contact piece; 3016-Guide plate hole; 3017-Fourth heat dissipation hole; 30 18-Wiring hole; 302-Upper support plate; 3021-First guide part; 3022-First fastening part; 3023-First mounting part; 3024-First fastening hole; 3025-First mounting hole; 3026-Sixth heat dissipation hole; 3027-First guide hole; 303-Lower support plate; 3031-Second guide part; 3032-Second fastening part; 3033-Second mounting part; 3034-Second fastening hole; 3035-Second mounting hole; 3036-Third heat dissipation hole; 3037-Second guide hole; 4-Wiring bar; 5-Guide plate. Detailed Implementation

[0018] 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.

[0019] The purpose of this invention is to provide a heat dissipation structure and circuit breaker to solve the problems existing in the prior art, enabling active heat dissipation and reducing the occurrence of thermal hysteresis.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-8As shown, this utility model provides a heat dissipation structure, including a base plate 2, a housing 1, and an electrical connection group 3. The base plate 2 has a first heat dissipation hole 201. The housing 1 is fixedly mounted on the base plate 2 and includes an upper housing 11 and a lower housing 12. The upper housing 11 and lower housing 12 are respectively used to fix a terminal block 4. Each electrical connection group 3 includes an upper support plate 302, a lower support plate 303, and two electrical connecting pieces 301. The two electrical connecting pieces 301 are connected to a terminal block 4. The upper support plate 302 is fixedly connected to one electrical connecting piece 301, and the lower support plate 303 is fixedly connected to the other electrical connecting piece 301. The two electrical connecting pieces 301 are connected by a guide plate 5. The bottom of the lower housing 12 has a second heat dissipation hole 121, and the lower support plate 303 has a third heat dissipation hole 3036. The two electrical connecting pieces 301... The upper support plate 302 is provided with a sixth heat dissipation hole 3026 and a fourth heat dissipation hole 3017 and a fifth heat dissipation hole 3017 respectively. A partition plate 13 is provided between the upper shell 11 and the lower shell 12. A seventh heat dissipation hole 131 is provided on the partition plate 13. An eighth heat dissipation hole 111 is provided on the top of the upper shell 11. The first heat dissipation hole 201, the second heat dissipation hole 121, the third heat dissipation hole 3036, the fourth heat dissipation hole 3017, the fifth heat dissipation hole, the sixth heat dissipation hole 3026, the seventh heat dissipation hole 131, and the eighth heat dissipation hole 111 are aligned in the height direction. The airflow can pass through the first heat dissipation hole 201, the second heat dissipation hole 121, the third heat dissipation hole 3036, the fourth heat dissipation hole 3017, the fifth heat dissipation hole, the sixth heat dissipation hole 3026, the seventh heat dissipation hole 131, and the eighth heat dissipation hole 111 in sequence. After entering through the first heat dissipation hole 201 of the base plate 2, the airflow flows sequentially through the bottom of the lower housing 12 (second heat dissipation hole 121), the lower support plate 303 (third heat dissipation hole 3036), the electrical connector 301 (fourth heat dissipation hole 3017, fifth heat dissipation hole), the upper support plate 302 (sixth heat dissipation hole 3026), and the partition plate 13 (seventh heat dissipation hole 131), finally exiting through the eighth heat dissipation hole 111 at the top of the upper housing 11. This path completely covers all the key heat-generating components of the electrical connection group 3 (support plate, electrical connector 301, etc.), allowing the airflow to directly contact the heat source surface and quickly remove heat through convection heat transfer, preventing heat accumulation in local areas. Because the channels are interconnected and vertically distributed, the air inside the channels is heated when the electrical connection group 3 heats up, and the hot air rises naturally due to its lower density. The heat dissipation holes are directly opened on the core components (support plate, electrical connector 301) and shell structure of the electrical connection group 3. In the process of heat transfer from the heat source (electrical connection group 3) to the flowing air, there is no need to pass through the interface of bolted connection or welding, eliminating the thermal resistance caused by material gaps and oxide layer. Since the airflow directly washes over the heat-generating components, the heat generated can be carried away immediately, avoiding the lag phenomenon in traditional solutions where the heat source has overheated but the heat sink has not yet heated up.The heat dissipation holes are all opened on the existing structure (base plate 2, shell 1, electrical connection group 3 components), and channels are formed by utilizing the thickness and gaps of the components themselves. There is no need for outward-extending fins or additional structures. The overall volume is basically the same as that of a circuit breaker without heat dissipation design, which solves the problem of volume expansion caused by traditional heat sinks.

[0022] In some embodiments, the first heat dissipation hole 201, the second heat dissipation hole 121, the third heat dissipation hole 3036, the fourth heat dissipation hole 3017, the fifth heat dissipation hole, the sixth heat dissipation hole 3026, the seventh heat dissipation hole 131, and the eighth heat dissipation hole 111 are all elongated holes. For thin components such as the support plate and the connecting piece 301 of the electrical connection group 3, circular holes are limited by their diameter and have a small area per hole; while elongated holes can extend along the length of the component, maximizing the coverage area of ​​the heat dissipation holes without affecting the structural strength, thereby achieving maximum heat dissipation.

[0023] In some embodiments, a first air intake groove 122 is also provided at the bottom of the lower housing 12. The first air intake groove 122 is located between the lower housing 12 and the base plate 2, and is located on the back of the lower housing 12. The first air intake groove 122 is connected to the second heat dissipation hole 121, serving as an auxiliary heat dissipation channel (Q2). Airflow can enter through the first air intake groove 122 and eventually flow into the second heat dissipation hole 121. The air in the main heat dissipation channel (the first heat dissipation hole 201 to the eighth heat dissipation hole 111, Q1) mainly relies on the first heat dissipation hole 201 of the base plate 2 for intake. The addition of the first air intake groove 122 forms a dual-path air intake mode, effectively solving the problem of insufficient air supply that may exist in a single air intake path. The first air intake groove 122 is located between the lower housing 12 and the base plate 2 and is located on the back of the lower housing 12. This position can utilize the gap after the circuit breaker is installed (such as the space with the back plate of the distribution box, the gap between adjacent components) to obtain additional air. When the main air intake path (first heat dissipation hole 201) is reduced due to dust accumulation or installation obstruction, the first air intake slot 122 can serve as a supplementary air source to ensure that the second heat dissipation hole 121 always has sufficient airflow, thus preventing the main heat dissipation channel from experiencing a decrease in heat dissipation efficiency due to air supply interruption.

[0024] In some embodiments, a second air inlet groove 132 is provided on the back side of the partition 13. The second air inlet groove 132 is connected to the seventh heat dissipation hole 131, serving as another auxiliary heat dissipation channel (Q3). Airflow can move along the back side of the partition 13 to enter the second air inlet groove 132 and then flow into the seventh heat dissipation hole 131. In the heat dissipation channel, the area of ​​the partition 13 between the upper housing 11 and the lower housing 12 is a transfer hub for airflow flowing from bottom to top. When relying solely on bottom air intake, the airflow may experience insufficient pressure in the middle due to path loss during its ascent, affecting the airflow velocity entering the upper housing 11. The second air inlet groove 132 directly introduces external airflow onto the back side of the partition 13, which can directly supplement air to the seventh heat dissipation hole 131, enhance the airflow pressure in the middle, and ensure that the airflow can smoothly pass through the seventh heat dissipation hole 131 into the upper housing 11, avoiding the phenomenon of airflow interruption in the middle. During circuit breaker installation, the back of the partition 13 between the upper housing 11 and the lower housing 12 typically forms a natural gap with other components in the distribution box (such as the housings of adjacent circuit breakers or the vertical supports of the distribution box). This area easily forms stable horizontal or vertical airflow (such as airflow generated by overall thermal convection within the distribution box or natural wind entering from the external environment). The design of the second air intake slot 132 precisely captures and utilizes this idle airflow resource.

[0025] In some embodiments, the electrical connector 301 includes a connecting section 3011, an arc-shaped section 3012, and a wiring section 3013 that are fixedly connected in sequence. The connecting section 3011 is provided with a plurality of guide plate holes 3016 for connecting to a guide plate 5. The wiring section 3013 is provided with a plurality of wiring holes 3018 for connecting to a terminal block 4. The arc-shaped section 3012 is provided with a plurality of fourth heat dissipation holes 3017 along its length direction and an arc-shaped heat dissipation groove along its width direction, which also serves as an auxiliary heat dissipation channel (Q4). When the transverse airflow enters through the arc-shaped heat dissipation groove, it can carry away some heat, further helping the electrical connector 301 to dissipate heat better. The longitudinal fourth heat dissipation holes 3017 mainly act in the thickness direction of the electrical connector 301 (airflow passes through the hole), while the arc-shaped heat dissipation groove acts in the width direction (airflow flows along the groove). When the two are combined, the airflow can not only pass through the fourth heat dissipation hole 3017 to carry away the heat inside the electrical connector 301, but also scour the surface along the arc-shaped heat dissipation groove, covering blind areas such as the side wall of the groove and the connection area between holes that the fourth heat dissipation hole 3017 cannot reach.

[0026] In some embodiments, the upper support plate 302 includes a first guide portion 3021, a first fastening portion 3022, and a first mounting portion 3023, which are fixedly connected in sequence. The first guide portion 3021 is provided with a plurality of first guide holes 3027 for fixing to the guide plate 5. The first fastening portion 3022 is provided with a plurality of first fastening holes 3024 for fixing to the terminal block 4. The first mounting portion 3023 is provided with a plurality of first mounting holes 3025 for fixing to the housing. The first guide portion 3021 and the first fastening portion 3022 are provided with a sixth heat dissipation hole 3026. The sixth heat dissipation hole 3026 is not evenly distributed throughout the upper support plate 302, but is focused on the two core heat-generating areas of the first guide portion 3021 and the first fastening portion 3022 to achieve targeted heat dissipation.

[0027] In some embodiments, the lower support plate 303 includes a second guide portion 3031, a second fastening portion 3032, and a second mounting portion 3033, which are sequentially fixedly connected. The second guide portion 3031 is provided with a plurality of second guide holes 3037 for fixing to the guide plate 5. The second fastening portion 3032 is provided with a plurality of second fastening holes 3034 for fixing to the terminal block 4. The second mounting portion 3033 is provided with a plurality of second mounting holes 3035 for fixing to the housing. The second guide portion 3031 and the second fastening portion 3032 are provided with a third heat dissipation hole 3036. The third heat dissipation hole 3036 focuses on the two core heat-generating areas of the second guide portion 3031 and the second fastening portion 3032 to achieve targeted heat dissipation.

[0028] In some embodiments, the housing 1 is an insulating housing. The terminal blocks 4, electrical connection groups 3, contact system, etc., inside the circuit breaker are all high-voltage live components. The insulating housing (usually made of reinforced engineering plastic) can completely enclose these components, blocking their conductive path to external operators and mounting panels. Even if internal components leak current due to aging or damage, the insulating housing can effectively prevent current leakage, avoiding electric shock accidents when operators touch the housing. If traditional metal housings have ventilation holes, the edges of the holes are prone to forming concentrated electric fields, potentially causing corona discharge; however, the ventilation holes in the insulating housing (such as the second ventilation hole 121 and the eighth ventilation hole 111) are made of insulating material and do not become conductors, naturally avoiding the problem of concentrated electric fields. Even if the holes are close to internal live components, the insulating material itself can weaken the electric field strength, ensuring good insulation performance under high-voltage conditions.

[0029] In some embodiments, the connecting segment 3011 is provided with a plurality of partition slits 3014, which divide the connecting segment 3011 into a plurality of contact pieces 3015 along its length. Each contact piece 3015 is connected to a guide plate 5. When a conventional integrated connecting segment 3011 is connected to a guide plate 5, it is prone to problems such as local fitting and local gaps due to processing flatness errors and uneven assembly pressure, resulting in insufficient actual effective contact area. However, multiple independent contact pieces 3015 can adapt to the flatness differences of the guide plate 5 surface through their own slight deformation (metal elasticity), and each contact piece 3015 can fit tightly with the guide plate 5.

[0030] Example 2 This utility model also provides a circuit breaker, including a terminal block 4 and the heat dissipation structure in Embodiment 1, which can achieve active heat dissipation and reduce the occurrence of thermal hysteresis. Both the upper housing 11 and the lower housing 12 are provided with a set of electrical connecting plates 301, an upper support plate 302, and a lower support plate 303. Both the upper housing 11 and the lower housing 12 are provided with a terminal block 4. The housing may also include multiple upper housings 11 and multiple lower housings 12. Each upper housing 11 and each lower housing 12 includes an electrical connection cavity 14 for accommodating the electrical connection group 3. Both the upper housing 11 and the lower housing 12 have a mounting port 15 on their backs, with mounting holes for inserting the terminal block 4.

[0031] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A heat dissipating structure, characterized by: The device includes a base plate, a housing, and electrical connection assemblies. The base plate has a first heat dissipation hole. The housing is fixedly mounted on the base plate and includes an upper housing and a lower housing. The upper housing and the lower housing are respectively used to fix a terminal block. Each electrical connection assembly includes an upper support plate, a lower support plate, and two electrical connecting pieces. The two electrical connecting pieces are connected to one terminal block. The upper support plate is fixedly connected to one electrical connecting piece, and the lower support plate is fixedly connected to the other electrical connecting piece. The two electrical connecting pieces are connected via a guide plate. The bottom of the lower housing has a second heat dissipation hole, the lower support plate has a third heat dissipation hole, and the two electrical connecting pieces each have a fourth heat dissipation hole. The upper support plate has a sixth heat dissipation hole, a partition plate is provided between the upper shell and the lower shell, a seventh heat dissipation hole is provided on the partition plate, and an eighth heat dissipation hole is provided on the top of the upper shell. The first, second, third, fourth, fifth, sixth, seventh, and eighth heat dissipation holes are aligned in the height direction, and the airflow can pass through the first, second, third, fourth, fifth, sixth, seventh, and eighth heat dissipation holes in sequence.

2. The heat dissipation structure according to claim 1, characterized in that: The first heat dissipation hole, the second heat dissipation hole, the third heat dissipation hole, the fourth heat dissipation hole, the fifth heat dissipation hole, the sixth heat dissipation hole, the seventh heat dissipation hole and the eighth heat dissipation hole are all elongated holes.

3. The heat dissipation structure according to claim 1, characterized by: The bottom of the lower housing is also provided with a first air intake groove, which is located between the lower housing and the bottom plate, and is located on the back of the lower housing. The first air intake groove is connected to the second heat dissipation hole.

4. The heat dissipation structure according to claim 1, characterized by: The back of the partition is provided with a second air inlet groove, which is connected to the seventh heat dissipation hole.

5. The heat dissipation structure according to claim 1, characterized by: The electrical connector includes a connecting segment, an arc segment, and a wiring segment that are fixedly connected in sequence. The connecting segment is used to connect to the guide plate, and the wiring segment is used to connect to the terminal block. The arc segment has a plurality of fourth heat dissipation holes along its length direction, and the arc segment has an arc-shaped heat dissipation groove along its width direction.

6. The heat dissipation structure according to claim 1, characterized by: The upper support plate includes a first guide portion, a first fastening portion, and a first mounting portion that are fixedly connected in sequence. The first guide portion is provided with a plurality of first guide holes for fixing with a guide plate. The first fastening portion is provided with a plurality of first fastening holes for fixing with a terminal block. The first mounting portion is provided with a plurality of first mounting holes for fixing with the housing. The first guide portion and the first fastening portion are provided with the sixth heat dissipation hole.

7. The heat dissipation structure according to claim 1, characterized by: The lower support plate includes a second guide portion, a second fastening portion, and a second mounting portion that are fixedly connected in sequence. The second guide portion is provided with a plurality of second guide holes for fixing with a guide plate. The second fastening portion is provided with a plurality of second fastening holes for fixing with a terminal block. The second mounting portion is provided with a plurality of second mounting holes for fixing with the housing. The second guide portion and the second fastening portion are provided with the third heat dissipation hole.

8. The heat dissipation structure according to claim 1, characterized by: The housing is an insulating housing.

9. The heat dissipation structure according to claim 5, characterized by: The connecting segment is provided with multiple partitions, which can divide the connecting segment into multiple contact pieces along the length direction, and each contact piece is connected to a guide plate.

10. A circuit breaker characterized by: It includes a terminal block and a heat dissipation structure as described in any one of claims 1-9.

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