A circuit breaker heat dissipation structure

Abstract

The application provides a circuit breaker heat dissipation structure, comprising a circuit breaker body, a drawer seat and a contact system, the circuit breaker body has a first body busbar and a second body busbar, the first body busbar and the second body busbar are arranged in an up-down manner in a second direction to form an incoming line row and an outgoing line row of the circuit breaker body and form an electrical connection through the contact system, the drawer seat has an electrical connection assembly and an insulating shell, the circuit breaker body can enter or leave the drawer seat in a first direction, so that the first body busbar and the second body busbar are in contact with or separated from the first end of the respective electrical connection assembly, the drawer seat has a first heat dissipation channel, the first heat dissipation channel passes through the electrical connection assembly to form a heat dissipation space and a heat dissipation path at the position of the electrical connection assembly.

Description

Technical Field

[0001] This invention relates to a circuit breaker, and more particularly to a circuit breaker with a drawer base. Background Technology

[0002] Circuit breakers are protective components in power distribution systems, with over 80% of the power flowing through them to reach end-user devices. When power flows through a circuit breaker, it generates a large amount of Joule heat, causing the circuit breaker's temperature to rise. When the temperature reaches above 160°C, the internal copper material will rapidly oxidize and degrade, and the plastic casing will also age faster due to the high temperature, leading to a decrease in insulation performance.

[0003] The frame current of a circuit breaker is the maximum current that the frame can withstand, such as 250A, 630A, 1600A, 2000A, 4000A, 6300A, etc. A circuit breaker should, within a frame of a certain external dimension, meet the requirements for connecting and disconnecting normal current and breaking abnormal current under the maximum rated current.

[0004] For ease of commissioning and maintenance, and for safety reasons, the circuit breaker body is typically connected to the external circuit via a drawer base. The drawer base uses bridge-type contacts or an electrical connection assembly, such as that in patent CN211017487U, to connect the busbar of the body to the external short circuit. Although the electrical connection assembly shown in patent CN211017487U has lower contact resistance and less heat generation compared to traditional bridge-type contacts, the increasingly demanding miniaturization of circuit breakers means that the smaller internal heat dissipation space still makes cooling the circuit breaker a problem.

[0005] According to Joule's law, Q = I 2 Rt, the heat generated by the circuit is proportional to the circuit resistance and the square of the current. Although circuit breakers with higher rated currents employ various methods to reduce circuit resistance, the influence of current is more significant. Moreover, within a certain frame size, it is impossible to infinitely increase the cross-section of the circuit to reduce the circuit resistance. Therefore, when operating at high current, huge heat generation is unavoidable, which seriously affects the normal use and lifespan of the circuit breaker. Especially in high-temperature environments, it is necessary to derate the circuit breaker, that is, to operate the circuit breaker at a lower rated current under a specific frame size in order to meet the requirements of the circuit breaker temperature rise.

[0006] Therefore, temperature rise is a core issue for the safe and reliable operation of circuit breakers. Traditional designs aim to reduce Joule heating and lower temperature rise by increasing the cross-sectional area of ​​the internal conductive circuit of the circuit breaker. This method occupies a large space and consumes a lot of precious metals such as copper. In addition, the use of a large amount of copper occupies the internal space of the circuit breaker, making it difficult to implement ventilation and heat dissipation, resulting in poor heat dissipation and significantly reducing the reduction in operating temperature rise caused by increasing copper content. Summary of the Invention

[0007] The technical problem to be solved by this invention is the ventilation and heat dissipation of the drawer base during the operation of a circuit breaker.

[0008] To achieve the above objectives, the present invention designs a heat dissipation structure for a circuit breaker, including a circuit breaker body, a drawer base, and a contact system. The circuit breaker body has a first body busbar and a second body busbar, which are arranged vertically in a second direction to form the inlet and outlet busbars of the circuit breaker body and are electrically connected through the contact system to form a current pole. The drawer base has an electrical connection component and an insulating shell. The circuit breaker body can enter or leave the drawer base in a first direction, so that the first body busbar and the second body busbar contact or separate from the first end of their respective electrical connection components. It also includes a terminal block, the inner end of which contacts the second end of the electrical connection component, and the outer end of which is connected to an external circuit. The drawer base has a first heat dissipation channel in the second direction, which passes through the electrical connection component to form a heat dissipation space and a heat dissipation path at the location of the electrical connection component.

[0009] Furthermore, the electrical connection assembly includes a contact conductive sheet, which includes a first connection end, a second connection end, and an intermediate section. The intermediate section is a flexible structure, allowing either the first or second connection end to be unaffected by either connection end and thus not shift. That is, even if one connection end is fixed, the other connection end can still shift or deflect to a certain extent. The first and second connection ends respectively form the first and second ends of the electrical connection assembly. Specifically, the electrical connection assembly forms the first end connected to the circuit breaker body busbar through the first connection end of the contact conductive sheet, and the electrical connection assembly forms the second end connected to the terminal through the second connection end of the contact conductive sheet. The intermediate section has ventilation slots, so the first heat dissipation channel includes ventilation slots. The ventilation slots of the electrical connection assemblies arranged vertically on the same current pole are connected, meaning each current pole has at least two electrical connection assemblies. The two electrical connection assemblies are arranged vertically in a second direction and correspondingly connected to the busbar of the circuit breaker body. The ventilation slots of the upper and lower electrical connection assemblies are connected, forming a smooth first heat dissipation channel.

[0010] Furthermore, the circuit breaker heat dissipation structure also includes a ventilation shroud, which is mounted on top of the drawer base and has a second heat dissipation channel in a second direction. The second heat dissipation channel is located above the first heat dissipation channel in the second direction and communicates with the first heat dissipation channel, so that the hot air exhausted by the first heat dissipation channel reaches the external space after passing through the second heat dissipation channel.

[0011] Furthermore, the lower part of the ventilation hood is a collecting hood, which is sealed to the drawer seat's insulating shell and installed above the drawer seat to form a sealed heat dissipation channel. An exhaust port is left at the top of the ventilation hood to communicate with the atmosphere. The internal space of the collecting hood corresponds to the position of the ventilation groove on the contact conductive sheet, forming a connection between the first heat dissipation channel and the second heat dissipation channel.

[0012] According to one embodiment of the present invention, at least two current electrodes are arranged in the third direction, each current electrode is provided with a ventilation hood, and an interphase guide plate is provided between adjacent ventilation hoods to separate the second heat dissipation channels of adjacent ventilation hoods, so that the high-temperature airflow discharged from the first heat dissipation channel of adjacent current electrodes does not affect each other in the ventilation hood and reduce the convection efficiency.

[0013] Furthermore, the contact conductive sheet of the electrical connection component is arranged with multiple ventilation slots in the third direction, forming their respective first heat dissipation channels. That is, each electrical connection component has multiple paths forming first heat dissipation channels, increasing the heat dissipation effect. Each current electrode has an inter-channel guide plate in the ventilation shroud, which divides the second heat dissipation channel of each current electrode into multiple channels. The multiple channels are connected to their respective ventilation slots, that is, corresponding to the paths of multiple first heat dissipation channels. The second heat dissipation channels are also divided into multiple non-interfering channels, so that the high-temperature gas in the multiple first heat dissipation channels in each current electrode does not interfere with each other in the ventilation shroud.

[0014] According to another embodiment of the present invention, the electrical connection assembly further includes a second heat sink having an air guide groove, and the first heat dissipation channel includes the air guide groove; the second heat sink is mounted on the electrical connection assembly to further enhance the heat dissipation capacity of the electrical connection assembly.

[0015] Furthermore, the electrical connection assembly includes a contact conductive sheet, which includes a first connection end, a second connection end, and an intermediate section. The intermediate section is a flexible structure, allowing either the first or second connection end to be unaffected by either connection end and thus not shift. That is, even if one connection end is fixed, the other connection end can still shift or deflect to a certain extent. The first and second connection ends form the first and second ends of the electrical connection assembly, respectively. Specifically, the electrical connection assembly forms the first end connected to the circuit breaker body busbar via the first connection end of the contact conductive sheet, and the electrical connection assembly forms the second end connected to the terminal block via the second connection end of the contact conductive sheet. The intermediate section has a ventilation slot, so the first heat dissipation channel includes a ventilation slot. The ventilation slots of the electrical connection assemblies arranged vertically on the same current pole are connected, meaning each current pole has at least two electrical connection assemblies. These two electrical connection assemblies are arranged vertically in a second direction and correspondingly connected to the busbar of the circuit breaker body. The ventilation slots of the two electrical connection assemblies are connected, forming a smooth first heat dissipation channel. The air guide slot is connected to the ventilation slot, thus making the air guide slot of the second radiator part of the first heat dissipation channel.

[0016] Furthermore, the electrical connection assembly also includes a fastening device that sequentially clamps the second heat sink, the contact conductive plate, and the main body busbar. The second heat sink includes a second rear fin group, a second front fin group, and a second fin base. The second fin base contacts the contact conductive plate. The second rear fin group has multiple groups, with air guide slots located between adjacent groups of second rear fins. The second front fin group at least partially surrounds the fastening device. In this way, the second heat sink can dissipate some of the heat from the electrical connection assembly.

[0017] Furthermore, the contact conductive sheet and the second heat sink are stacked and assembled together within the drawer seat insulating housing, maintaining a certain distance from both sides of the drawer seat insulating housing, naturally forming a vertically connected sidewall air duct, i.e., air ducts are formed on both sides of the electrical connection assembly. The ventilation slots on the contact conductive sheet and the interfinal air guide slots on the second heat sink are vertically connected, naturally forming a vertical air duct; the central cavity where the contact conductive sheet contacts the main busbar naturally forms a horizontal air duct. In this way, the sidewall air duct, the vertical air duct, and the horizontal air duct together form an optimized first heat dissipation channel, greatly improving the heat dissipation effect. The central cavity is formed by the space between the two contact conductive sheets clamping the two sides of the main busbar.

[0018] According to another embodiment of the present invention, a first heat sink is also provided, including a first fin base in contact with the first connection end and first fins evenly distributed on the first fin base, to further remove heat from the electrical internal connection assembly.

[0019] By arranging ventilation slots in the internal components of the circuit breaker and designing the external air guiding structure, an overall heat dissipation air duct structure is formed inside the circuit breaker, which meets the requirements for low-temperature operation of the circuit breaker and is especially suitable for large-capacity, long-term full-load operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker heat dissipation structure involved in this invention.

[0021] Figure 2 This is a side sectional view of the overall structure of the heat dissipation structure of the circuit breaker involved in this invention.

[0022] Figure 3 This invention relates to the internal structure of the circuit breaker body.

[0023] Figure 4 This is a schematic diagram of the back of the circuit breaker involved in this invention.

[0024] Figure 5 This is a schematic diagram of the heat dissipation structure of the circuit breaker electrical connection assembly involved in this invention.

[0025] Figure 6 This is a schematic diagram of the structure of the first heat sink involved in this invention.

[0026] Figure 7 This is a schematic diagram of the structure of the contact conductive sheet involved in this invention.

[0027] Figure 8 This is a schematic diagram of the structure of the second heat sink involved in this invention.

[0028] Figure 9 This is a schematic diagram of the ventilation shroud of the circuit breaker heat dissipation structure involved in this invention.

[0029] Figure 10 This is a schematic diagram of the protective cover of the circuit breaker heat dissipation structure involved in this invention.

[0030] Figure 11 This is a schematic diagram of the heat dissipation path of the electrical connection component involved in this invention.

[0031] Figure 12 This is a schematic diagram of the heat dissipation path of the circuit breaker heat dissipation structure without a ventilation shroud involved in this invention.

[0032] Figure 13 This is a schematic diagram of the heat dissipation path of the ventilation shroud of the circuit breaker heat dissipation structure involved in this invention, according to Embodiment 1.

[0033] Figure 14 This is a schematic diagram of the heat dissipation path of the ventilation shroud of the circuit breaker heat dissipation structure involved in this invention, in Embodiment 2.

[0034] Figure 15 This is a schematic diagram of the heat dissipation path of the ventilation shroud of the circuit breaker heat dissipation structure involved in this invention, in Embodiment 3. Detailed Implementation

[0035] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0036] Marker explanation:

[0037] Circuit breaker body 1, first body busbar 11, second body busbar 12, body base 13;

[0038] Drawer base 2, centralized heat dissipation channel 200;

[0039] Insulating shell 3,

[0040] First radiator 31, first fin 311, first fin base 312;

[0041] The conductive contact sheet 32, the first connecting end 321, the middle section 322, the second connecting end 323, the ventilation groove 324, and the flexible groove 325 are all included.

[0042] Second radiator 33, second rear fin group 331, air guide slot 332, second front fin group 333, second fin base 334;

[0043] Vertical air duct 301;

[0044] Horizontal air duct 302;

[0045] Side wall air duct 303;

[0046] Ventilation hood 4,

[0047] Exhaust port 41, air collection hood 42, inter-channel guide plate 43, inter-phase guide plate 44, first channel 401, second channel 402, third channel 403;

[0048] Terminal block 5, internal terminal 51, external terminal 52;

[0049] Isolation cover 6, first ventilation hole 61, second ventilation hole 62, third ventilation hole 63, mounting buckle 64;

[0050] Electrical connection assembly 7, fastening device 71, first end 72, second end 73, intermediate cavity 74;

[0051] First direction X, second direction Y, third direction Z

[0052] To better understand the concept of this invention, the following description is provided in conjunction with the accompanying drawings.

[0053] like Figures 1 to 15 To achieve the above objectives, the present invention designs a heat dissipation structure for a circuit breaker, including a circuit breaker body 1, a drawer base 2, and a contact system. The circuit breaker body 1 has a first body busbar 11 and a second body busbar 12. The first body busbar 11 and the second body busbar 12 are arranged vertically in a second direction to form the inlet and outlet busbars of the circuit breaker body 1 and are electrically connected through the contact system to form a current pole. The contact system includes a moving contact 13 and a stationary contact 14 located on the first body busbar 11. A flexible connection 15 is welded or fixedly connected to the moving contact 13. The flexible connection is fixedly connected to the second body busbar 12. When the moving contact 13 contacts the stationary contact 14, the first body busbar 11 and the second body busbar 12 form a conductive path.

[0054] The circuit breaker body 1 can be mounted on the drawer base 2 and can move on the drawer base 2, such as... Figure 2 When the circuit breaker body 1 moves to the right in the first direction X, the body busbars 11 and 12 can contact their respective electrical connection devices 7, making the body 1 electrically connected to the drawer seat 2; when the circuit breaker body 1 moves to the left in the first direction X, the body busbars 11 and 12 can disengage from their respective electrical connection devices 7, making the body 1 electrically disconnected from the drawer seat 2. The drawer seat 2 has an insulating housing 3, and the electrical connection assembly 7 is mounted on the insulating housing 3.

[0055] like Figure 6 The first heat sink 31 includes a first fin base 312 that contacts the first connection end 321 of the contact conductive sheet 32, and multiple fins 311 evenly distributed on the first fin base 312.

[0056] like Figure 7The conductive contact sheet 32 ​​includes a first connecting end 321, a second connecting end 323, and an intermediate section 322 connecting the first connecting end 321 and the second connecting end 323. The intermediate section 322 has flexible and bendable characteristics, such as being made of laminated copper foil, with ventilation slots 324 and flexible slots 325 formed on it. The ventilation slots 324 are used to form heat dissipation channels and improve the flexibility of the intermediate section 322. The openings of the flexible slots 325 are smaller than those of the ventilation slots 324 and are evenly distributed on the intermediate section 322, further increasing the flexibility. In essence, the number of ventilation slots 324 needs to be compromised between ventilation and heat dissipation efficiency and the current-carrying cross-section of the contact conductive sheet 32. Therefore, it is not advisable to set too many. In order to accommodate the deviations in the manufacturing and installation of multiple main busbars 11 and 12 when they are simultaneously inserted into the electrical connection device 7, it is necessary to further increase the bending and deflection performance of the intermediate section 322 to reduce the insertion resistance and operational comfort. Therefore, a small, narrow, flexible slot 325 is opened on the intermediate section 322.

[0057] like Figure 8 The second heat sink 33 includes a second fin base 334 that contacts the second connection end 323 of the contact conductive plate 32, and a second front fin group 333 and a second rear fin group 331 with different fin distributions. After the second heat sink 33 is installed on the electrical connection assembly 7, the second front fin groups 333 are distributed approximately around the fastening device 71 in a manner that at least partially surrounds it, or in other words, the fastening device 71 passes through the distribution area of ​​the second front fin groups 333 to install the second heat sink 33, the contact conductive plate 32, and the main body busbar together. The second rear fin groups 331 have multiple sets, and there is an interfinal air guide groove 332 between two sets of second rear fin assemblies 331. The air guide groove 332 can be configured to communicate with the ventilation groove 324 of the contact conductive plate 32 to form a first heat dissipation channel. In the embodiments shown in this invention, multiple air guide slots 332 and multiple ventilation slots 324 are directly aligned and connected to form a heat dissipation channel. Of course, without affecting the ventilation efficiency, the corresponding air guide slots 332 and ventilation slots 324 can be connected by a certain bend path.

[0058] like Figure 9A ventilation hood 4 is also installed on the top of the insulating shell 3 of the drawer seat 2, which is connected to the first heat dissipation channel formed by the electrical connection device 7. The lower part of the ventilation hood 4 is an air collecting hood, which is sealed to the insulating shell 3 of the drawer seat 2 and installed above the drawer seat 2, forming a sealed heat dissipation channel, so that the airflow can only move upward. An exhaust port 41 is left at the top of the ventilation hood 4 to communicate with the atmosphere, and the exhaust port 41 is mainly used for further filtering of the airflow. Based on a multi-pole circuit breaker, each current pole has a first heat dissipation channel. Therefore, an interphase guide plate 44 is set between the air collecting hoods of adjacent current poles. If there are multiple first heat dissipation channels in each current pole, an interphase guide plate 43 is further set in each air collecting hood to form a second heat dissipation channel in the ventilation hood. In this way, each first heat dissipation channel is connected to its respective second heat dissipation channel without interfering with each other.

[0059] like Figure 10 After the first radiator 31 is installed on the electrical connection device 7, it will accumulate dust in the external environment and affect the heat dissipation efficiency. Therefore, an isolation cover 6 with dustproof and ventilation functions is installed on its outside. Depending on the different shapes of the first radiator 31, dustproof and ventilation holes can be set on multiple surfaces in contact with the external environment, such as the first ventilation hole 61, the second ventilation hole 62, and the third ventilation hole 63 in this embodiment. The installation and removal on the circuit breaker can be conveniently achieved by installing the buckle 64.

[0060] The following description further illustrates the installation and arrangement of the various components in the circuit breaker to better understand the working principle of the present invention.

[0061] like Figures 2 to 5 In order to connect to an external load, the drawer seat 2 also has a terminal block 5. The inner terminal 51 of the terminal block 5 is in conductive contact with the second terminal 73 of the electrical connection component 7. More specifically, the second terminal and the outer terminal 52 of the electrical connection component 7 pass through the insulating housing 3 and are connected to the external load. The drawer seat 2 has a first heat dissipation channel in the second direction Y. The heat dissipation channel passes through the electrical connection component 7 and forms a heat dissipation space and heat dissipation path at the location of the electrical connection component. According to the principle of air convection, hot air moves from bottom to top and is discharged from the drawer seat.

[0062] The electrical connection assembly includes a contact conductive sheet 32, which includes a first connection end 321, a second connection end 323, and an intermediate section 322. The intermediate section 322 is a flexible structure, allowing the first connection end 321 or the second connection end 323 to be unaffected by either connection end and thus not shift. That is, even if one connection end is fixed, the other connection end can still shift or deflect to a certain extent. The first connection end 321 and the second connection end 323 respectively form the first end and the second end of the electrical connection assembly. Specifically, the electrical connection assembly forms the first end connected to the busbar of the circuit breaker body 1 through the first connection end 321 of the contact conductive sheet 32, and the electrical connection assembly forms the second end connected to the terminal block through the second connection end 323 of the contact conductive sheet 32. The middle section 322 has a ventilation slot 324, and the first heat dissipation channel inside the drawer seat includes the ventilation slot 324; the ventilation slots 324 of the electrical connection components arranged on the same current pole are connected, that is, each current pole has at least two electrical connection components 7, the two electrical connection components 7 are arranged on the second direction and are connected to the busbars 11 and 12 of the circuit breaker body 1, and the ventilation slots 324 of the upper and lower electrical connection components 7 are connected to form a smooth first heat dissipation channel.

[0063] like Figure 2 and Figure 9 The circuit breaker heat dissipation structure also includes a ventilation hood 4, which is installed on top of the drawer seat 2. Inside the ventilation hood 4 is a second heat dissipation channel in a second direction. The second heat dissipation channel is located above the first heat dissipation channel in the second direction and is connected to the first heat dissipation channel, so that the hot air discharged from the first heat dissipation channel reaches the external space after passing through the second heat dissipation channel.

[0064] The lower part of the ventilation hood 4 is a collecting hood, which is sealed to the drawer seat 2 and the insulating shell 3, and installed above the drawer seat 2 to form a sealed heat dissipation channel. An exhaust port 41 is provided at the top of the ventilation hood 4 to communicate with the atmosphere. The exhaust port 41 filters the airflow to prevent metal particles from flowing out of the circuit breaker. Above the position of the ventilation groove 324 on the contact conductive sheet 32, the internal space of the collecting hood corresponds to the position of the first heat dissipation channel and the second heat dissipation channel. In this embodiment, the second heat dissipation channel is approximately aligned with the first heat dissipation channel to maximize the heat dissipation efficiency of the entire heat dissipation structure.

[0065] According to an embodiment of the present invention, in the current circuit breaker structure, AC circuit breakers are generally three-pole or four-pole, and DC circuit breakers can be at least two-pole. Therefore, the circuit breaker can have multiple current poles arranged in parallel in the third direction. Each current pole is provided with a ventilation hood 4, and an interphase guide plate is provided between adjacent ventilation hoods 4 to separate the second heat dissipation channel of adjacent ventilation hoods 4, so that the high-temperature airflow discharged from the first heat dissipation channel of adjacent current poles does not affect each other in the ventilation hood 4 and reduce the convection efficiency.

[0066] Because high-current circuit breakers generate more heat, the contact conductive plates 32 of the electrical connection components are wider in the third direction. Therefore, multiple ventilation slots 324 can be arranged to form their own first heat dissipation channels. In other words, each electrical connection component 7 has multiple paths to form the first heat dissipation channels, which increases the heat dissipation effect. Each current electrode has an inter-channel guide plate in the ventilation shroud 4, which divides the second heat dissipation channel of each current electrode into multiple channels. The multiple channels are connected to their respective ventilation slots 324, which correspond to the paths of the multiple first heat dissipation channels. The second heat dissipation channels are also divided into multiple channels that do not interfere with each other, so that the high-temperature gas in the multiple first heat dissipation channels in each current electrode does not interfere with each other in the ventilation shroud 4.

[0067] like Figure 5 and Figure 8 The electrical connection assembly 7 further includes a second heat sink 33, which has an air guide groove 332. The first heat dissipation channel includes the air guide groove 332. The second heat sink 33 is mounted on the electrical connection assembly to further enhance the heat dissipation capacity of the electrical connection assembly. The electrical connection assembly also includes a fastening device 7, which clamps the second heat sink 33, the contact conductive plate 32, and the main body busbar in sequence. The second heat sink 33 includes a second rear fin group 331, a second front fin group 333, and a second fin base 334. The second fin base 334 contacts the contact conductive plate 32 to conduct heat. The second rear fin group 331 has multiple groups, and the air guide groove 332 is located between two adjacent groups of second rear fin groups 331. The second front fin group 333 at least partially surrounds the fastening device. In this way, the second heat sink 33 can remove some of the heat from the electrical connection assembly, and the air guide grooves 332 are aligned with the ventilation grooves 324, so the number of them is also corresponding.

[0068] The electrical connection assembly includes a contact conductive sheet 32, which includes a first connection end 321, a second connection end 323, and an intermediate section 322. The intermediate section 322 is a flexible structure, allowing the first connection end 321 or the second connection end 323 to be unaffected by either connection end and thus not shift. That is, even if one connection end is fixed, the other connection end can still shift or deflect to a certain extent. The first connection end 321 and the second connection end 323 respectively form the first end and the second end of the electrical connection assembly. Specifically, the electrical connection assembly forms the first end connected to the busbar of the circuit breaker body 1 through the first connection end 321 of the contact conductive sheet 32, and the electrical connection assembly forms the second end connected to the terminal block through the second connection end 323 of the contact conductive sheet 32. The intermediate section 322 has a ventilation slot 324, and the first heat dissipation channel inside the drawer seat includes the ventilation slot 324. The ventilation slots 324 of the electrical connection components arranged above and below the same current pole are connected, that is, each current pole has at least two electrical connection components 7. The two electrical connection components 7 are arranged above and below in the second direction and are correspondingly connected to the busbars 11 and 12 of the circuit breaker body 1. The ventilation slots 324 of the upper and lower electrical connection components 7 are connected to form a smooth first heat dissipation channel. The air guide slot is connected to the ventilation slot 324, so that the air guide slot of the second radiator 33 becomes part of the first heat dissipation channel.

[0069] like Figure 11 The conductive contact plate 32 and the second heat sink 33 are stacked and assembled together in the insulating shell 3 of the drawer seat 2, maintaining a certain distance from both sides of the insulating shell 3 of the drawer seat 2, naturally forming a vertically connected side wall air duct 303, that is, forming air ducts on both sides of the electrical connection assembly. The ventilation groove 324 on the conductive contact plate 32 and the interfinal air guide groove 332 on the second heat sink 33 are vertically connected, naturally forming a vertical air duct 301; the middle cavity where the conductive contact plate 32 contacts the main busbar naturally forms a horizontal air duct 302. In this way, the side wall air duct 303, the vertical air duct 301, and the horizontal air duct 302 together form an optimized first heat dissipation channel, greatly improving the heat dissipation effect. The middle cavity is formed by the space between the two conductive contact plates 32 that are tightened on both sides of the main busbar. The middle cavity allows adjacent first heat dissipation channels to connect at the conductive contact plate 32, creating a horizontal flow effect, which can carry away the heat on the surface of the conductive contact plate 32.

[0070] According to another embodiment of the present invention, it also has a first heat sink 31, including a first fin base 312 contacted by a first connection end 321 and first fins 311 uniformly distributed on the first fin base 312, which further removes heat from the electrical internal connection assembly.

[0071] like Figures 12 to 15 As shown,

[0072] Without the ventilation hood 4 installed, the airflow from the multiple first heat dissipation channels will diffuse and interfere with each other, resulting in low ventilation efficiency.

[0073] After installing the ventilation hood 4, a second heat dissipation channel is formed through the first channel 401, creating a chimney effect and improving the efficiency of upward airflow. Further investigation revealed that if the interphase guide plate 44 is not installed inside the ventilation hood 4, the airflow from the first heat dissipation channel will flow laterally, interfering with the airflow between adjacent current poles and affecting ventilation efficiency. With the addition of the interphase guide plate 44, an independent second heat dissipation channel is formed for each current pole through the second channel 402. It can be seen that each second channel 402 does not interfere with each other, resulting in a better effect compared to the first channel 401.

[0074] If multiple first heat dissipation channels are provided in each current electrode, in order to ensure that the airflow of adjacent channels does not interfere with each other, an inter-channel guide plate 43 can be further provided in each second channel 402 to form multiple third channels 403 so that each current electrode has multiple second heat dissipation channels corresponding to their respective first heat dissipation channels, thus ensuring the ventilation efficiency of each first heat dissipation channel in each current electrode.

[0075] It should be noted that, in this document, relational terms such as first and second, before and after, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit the invention. Any person skilled in the art to which this application pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

[0077] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, substitutions for other connection methods described above can be made by referring to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A circuit breaker heat dissipation structure, comprising a circuit breaker body (1), a drawer base (2), and a contact system, wherein the circuit breaker body (1) has a first body busbar (11) and a second body busbar (12), the first body busbar (11) and the second body busbar (12) are arranged vertically in a second direction (Y) to form the inlet and outlet busbars of the circuit breaker body, and are electrically connected through the contact system to form a current pole; The drawer base (2) has an electrical connection assembly (7) and an insulating housing (3); The circuit breaker body (1) enters or leaves the drawer seat (2) in the first direction (X), causing the first body busbar (11) and the second body busbar (12) to contact or separate from the first end of their respective electrical connection components (7); It also includes a terminal block (5), the inner end of which is in contact with the second end of the electrical connection assembly (7), and the outer end is connected to an external circuit; Its features are, The drawer seat has a first heat dissipation channel in the second direction (Y), and the first heat dissipation channel passes through the electrical connection assembly (7); The electrical connection assembly (7) includes a contact conductive sheet (32), which includes a first connection end (321), a second connection end (323), and an intermediate section (322). The intermediate section (322) is a flexible structure, so that the first connection end (321) or the second connection end (323) is not affected by either connection end and is offset. The first connection end (321) and the second connection end (323) form the first end and the second end of the electrical connection assembly (7), respectively. The intermediate section (322) has a ventilation groove (324), so the first heat dissipation channel includes the ventilation groove (324). The ventilation slots (324) of the electrical connection assemblies (7) arranged on the same current pole are connected; It also includes a ventilation hood (4), which is mounted on top of the drawer seat (2) and has a second heat dissipation channel in the second direction (Y), which is located above the first heat dissipation channel in the second direction (Y) and communicates with the first heat dissipation channel; A phase guide plate (44) is provided between adjacent ventilation hoods (4) to separate the second heat dissipation channel of adjacent ventilation hoods (4); The electrical connection assembly (7) further includes a fastening device (71) that sequentially clamps the second radiator (33), the contact conductive sheet (32), and the first body busbar (11); the fastening device (71) sequentially clamps the second radiator (33), the contact conductive sheet (32), and the second body busbar (12); the second radiator (33) includes a second rear fin group (331), a second front fin group (333), and a second fin base (334); the second fin base (334) is in contact with the contact conductive sheet (32); the second rear fin group (331) has multiple groups, and air guide grooves (332) are located between adjacent second rear fin groups (331); the second front fin group (333) at least partially surrounds the fastening device; It also has a first heat sink (31), including a first fin base (312) in contact with the first connecting end (321) and first fins (311) evenly distributed on the first fin base (312); The first heat sink (31) and the second heat sink (33) are provided on both the upper and lower sides of the contact conductive sheet (32).

2. The circuit breaker heat dissipation structure according to claim 1, characterized in that, The lower part of the ventilation hood (4) is a wind collector hood (42). The wind collector hood (42) is sealed and connected to the drawer seat insulating shell (3) and installed above the drawer seat (2) to form a first channel (401) that is sealed on all sides. An exhaust port (41) is left at the upper part of the ventilation hood (4) to communicate with the atmosphere. The second heat dissipation channel includes the first channel (401). The space inside the air collecting shroud (42) is above the ventilation groove (324) on the contact conductive sheet (32), so that the first heat dissipation channel and the second heat dissipation channel are connected.

3. The circuit breaker heat dissipation structure according to claim 2, characterized in that, At least two current electrodes are arranged in the third direction (Z), and each current electrode is provided with a ventilation hood (4).

4. The circuit breaker heat dissipation structure according to claim 3, characterized in that, The contact conductive sheet (32) of the electrical connection assembly (7) has multiple ventilation slots (324) arranged in the third direction (Z) and forms their respective first heat dissipation channels; Each of the current electrodes has an interchannel guide plate (43) inside the ventilation shroud (4), which divides the second heat dissipation channel of each current electrode into multiple channels, and the multiple channels are connected to their respective first heat dissipation channels.

5. The circuit breaker heat dissipation structure according to claim 1, characterized in that, The heat dissipation structure also includes a second heat sink (33), which has an air guide groove (332), so the first heat dissipation channel includes the air guide groove (332); The second heat sink (33) is mounted on the electrical connection assembly (7).

6. The circuit breaker heat dissipation structure according to claim 5, characterized in that, The air guide slot (332) is connected to the ventilation slot (324).

7. The circuit breaker heat dissipation structure according to claim 6, characterized in that, The contact conductive sheet (32) is stacked and assembled with the second heat sink (33), and together placed in the drawer seat insulating shell (3), maintaining a certain distance from both sides of the drawer seat insulating shell (3), naturally forming a side wall air duct (303) that is connected vertically. The ventilation groove (324) on the contact conductive sheet (32) and the interfin air guide groove (332) on the second heat sink (33) are connected vertically to form a vertical air duct (301). The intermediate cavity between the contact conductive sheet (32) and the first body busbar (11) or the contact conductive sheet (32) and the second body busbar (12) forms a transverse air duct (302).

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