CN116110749A - A heat dissipation structure of a circuit breaker - Google Patents

Abstract

The invention provides a circuit breaker radiating structure, which comprises a circuit breaker body, a drawer seat and a contact system, wherein the circuit breaker body is provided with a first body busbar and a second body busbar, and the first body busbar and the second body busbar are arranged up and down in a second direction to form an incoming line row and an outgoing line row of the circuit breaker body and form electric connection through the contact system; the drawer seat is provided with an electric 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 contacted with or separated from the first ends of the respective electric connection assemblies; the drawer seat is provided with a first heat dissipation channel, and the first heat dissipation channel passes through the electric connection assembly to form a heat dissipation space and a heat dissipation path at the position of the electric connection assembly.

Description

A heat dissipation structure of a circuit breaker

technical field

The invention relates to a circuit breaker, in particular to a circuit breaker with a drawer base.

Background technique

The circuit breaker is the protection element of the power distribution system, and more than 80% of the power flows through the circuit breaker to the terminal electrical device. When electricity flows through the circuit breaker, a large amount of Joule heat will be generated, which will cause the temperature of the circuit breaker to rise. When the temperature reaches above 160°C, the internal copper will be oxidized and lost rapidly, and the plastic shell will also age rapidly due to high temperature, resulting in a decline in insulation performance. .

The circuit breaker takes the maximum current that the frame can bear as the frame current, such as 250A, 630A, 1600A, 2000A, 4000A, 6300A and other frame currents. The circuit breaker should meet the maximum rated current in the frame of a certain size, the connection and disconnection of the normal current of the circuit and the breaking of the abnormal current.

For the convenience and safety of debugging, maintenance, etc., the circuit breaker body is generally connected to the external circuit through the drawer seat, and the drawer seat uses a bridge contact or an electrical connection assembly such as patent CN211017487U to connect the busbar of the body and the external short circuit, although the patent CN211017487U Compared with the traditional bridge contact, the electrical connection assembly shown has smaller contact resistance and lower heat generation. However, under the continuous requirement of circuit breaker miniaturization, the smaller internal heat dissipation space makes the cooling of the circuit breaker still become a problem.

According to Joule's law Q=I ² Rt, the heat emitted by the circuit is proportional to the loop resistance and the square of the current. Although the higher rated current circuit breaker adopts various methods to reduce the loop resistance, the influence of the current is more significant, and in a certain Within the size of the frame, it is impossible to increase the cross section of the circuit infinitely to reduce the circuit resistance. Therefore, when using a large current, a huge heat generation is unavoidable, which seriously affects the normal use and life of the circuit breaker, especially in high temperature environments. It has to be used with reduced capacity, that is, let the circuit breaker run at a lower rated current under a specific frame, so as to meet the temperature rise requirements of the circuit breaker.

For this reason, temperature rise is the core issue of safe and reliable operation of circuit breakers. The traditional design achieves the purpose of reducing Joule heat and temperature rise by increasing the cross-sectional area of the conductive loop inside the circuit breaker. This method takes up a lot of space and consumes a lot of precious metals such as copper. In addition, the use of a large number of copper materials occupies the internal space of the circuit breaker, making it difficult to implement ventilation and heat dissipation inside the circuit breaker, resulting in deterioration of heat dissipation, and the reduction in operating temperature rise caused by the addition of copper materials is greatly reduced.

Contents of the invention

The technical problem to be solved by the invention is the ventilation and heat dissipation of the drawer seat during the operation of the circuit breaker.

In order to achieve the above purpose, the present invention designs a heat dissipation structure of a circuit breaker, which includes 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, and the first body The busbar and the busbar of the second body are arranged up and down in the second direction to form the incoming line bar and outgoing line bar of the circuit breaker body, and are electrically connected through the contact system to form a current pole; the drawer seat has an electrical connection component, Insulation casing; the circuit breaker body can enter or leave the drawer seat in the first direction, so that the first body busbar and the second body busbar are in contact with or separated from the first ends of the respective electrical connection components; it also includes a terminal block , the inner connection end of the terminal block is in contact with the second end of the electrical connection assembly, and the outer connection end is connected to the external circuit; the drawer base has a first heat dissipation channel in the second direction, and the first heat dissipation channel passes through The electrical connection component forms a heat dissipation space and a heat dissipation path at the position of the electrical connection component.

A further step is that the electrical connection assembly includes a contact conductive sheet, and the contact conductive sheet includes a first connection end, a second connection end, and a middle section, and the middle section is a flexible structure, so that the first connection end or the second connection end The two connecting ends are not affected by any of the connecting ends to shift, that is, when any connecting end is fixed, the other connecting end can still be shifted or deflected to a certain extent. The first connection end and the second connection end respectively form the first end and the second end of the electrical connection assembly, that is, the electrical connection assembly forms the first end connected to the busbar of the circuit breaker body through the first connection end of the contact conductive sheet , the electrical connection component forms a second end connected to the terminal by contacting the second connection end of the conductive sheet. The middle section has ventilation slots, so the first heat dissipation channel includes ventilation slots; the ventilation slots of the electrical connection components arranged above and below the same current pole communicate, that is, one current pole has at least two electrical connection components, and two electrical connection components The connecting components are arranged up and down in the second direction, correspondingly connected with the busbars of the circuit breaker body, and the ventilation slots of the upper and lower electrical connecting components are connected to form a smooth first heat dissipation channel.

Furthermore, the heat dissipation structure of the circuit breaker also includes a ventilation cover, the ventilation cover is installed on the drawer seat, and has a second heat dissipation channel in the second direction, and the second heat dissipation channel is in the second direction It is located above the first heat dissipation channel and communicates with the first heat dissipation channel, so that the hot air discharged by the first heat dissipation channel passes through the second heat dissipation channel and reaches the external space.

A further step is that the lower part of the ventilation hood is an air collecting hood, and the air collecting hood is sealed and connected with the drawer seat insulation shell and installed above the drawer seat to form a closed cooling channel around the cover, and an exhaust port is left on the upper part of the ventilation hood It communicates with the atmosphere; above the inner space of the air collecting hood corresponding to the position of the ventilation groove on the contact conductive sheet, the communication between the first heat dissipation channel and the second heat dissipation channel is formed.

According to an embodiment of the present invention, there are at least two current poles arranged in the third direction, each of the current poles is arranged with a ventilation cover, and an interphase deflector is arranged between adjacent ventilation covers to separate phases. The second heat dissipation passage adjacent to the ventilation hood prevents the high-temperature airflow discharged from the first heat dissipation passage of the adjacent current electrode from interacting in the ventilation hood to reduce the convection efficiency.

A further step is that a plurality of ventilation slots are arranged in the third direction on the contact conductive sheet of the electrical connection component, and form respective first heat dissipation channels, that is to say, each electrical connection component has a plurality of first heat dissipation channels. The path of the channel increases the heat dissipation effect; there is an inter-channel deflector in the ventilation cover of each current pole, and the second heat dissipation channel of each current pole is divided into multiple channels, and the multiple channels are connected with the respective ventilation slots Communication, that is, the path corresponding to multiple first heat dissipation channels, the second heat dissipation passage is also divided into multiple channels that do not interfere with each other, so that the high-temperature gases of multiple first heat dissipation channels in each current pole complement each other in the ventilation hood .

According to another embodiment of the present invention, the electrical connection assembly further includes a second heat sink, the second heat sink has an air guide groove, and the first heat dissipation channel includes an air guide groove; the second heat sink is mounted in contact with the On the electrical connection component, the heat dissipation capability of the electrical connection component is further enhanced.

A further step is that the electrical connection assembly includes a contact conductive sheet, and the contact conductive sheet includes a first connection end, a second connection end, and a middle section, and the middle section is a flexible structure, so that the first connection end or the second connection end The two connecting ends are not affected by any of the connecting ends to shift, that is, when any connecting end is fixed, the other connecting end can still be shifted or deflected to a certain extent. The first connection end and the second connection end respectively form the first end and the second end of the electrical connection assembly, that is, the electrical connection assembly forms the first end connected to the busbar of the circuit breaker body through the first connection end of the contact conductive sheet , the electrical connection component forms a second end connected to the terminal by contacting the second connection end of the conductive sheet. The middle section has ventilation slots, so the first heat dissipation channel includes ventilation slots; the ventilation slots of the electrical connection components arranged above and below the same current pole communicate, that is, one current pole has at least two electrical connection components, and two electrical connection components The connecting components are arranged up and down in the second direction, correspondingly connected with the busbars of the circuit breaker body, and the ventilation slots of the upper and lower electrical connecting components are connected to form a smooth first heat dissipation channel. The air guiding groove communicates with the ventilation groove, that is, the air guiding groove of the second radiator becomes a part of the first heat dissipation channel.

Furthermore, the electrical connection assembly also includes a fastening device, which sequentially clamps the second radiator, the contact conductive sheet and the busbar of the body; the second radiator includes a second rear fin group, and the second radiator Two front fin groups, the second fin bottom; the second fin bottom is in contact with the contact conductive sheet; the second rear fin group has multiple, and the air guide groove is located between two adjacent second rear fin groups Between; said second set of front fins at least partially surrounds the fastening means. In this way, the second heat sink can take away part of the heat of the electrical connection assembly.

A further step is that the contact conductive sheet is stacked and assembled with the second heat sink, and placed together in the drawer base insulating shell, keeping a certain distance from both sides of the drawer base insulating shell, naturally forming a side wall that communicates up and down Air ducts, that is, air ducts are formed on both sides of the electrical connection components. The ventilation groove on the contact conductive sheet and the inter-fin air guide groove on the second radiator communicate up and down to form a vertical air channel naturally; the middle cavity where the contact conductive sheet is in contact with the main body busbar naturally forms a horizontal air channel . In this way, the side wall air ducts, vertical air ducts and horizontal air ducts jointly form an optimized first heat dissipation channel, which greatly improves the heat dissipation effect. The middle cavity is formed by tightening the space between the two contact conductive sheets on both sides of the busbar of the body.

According to another embodiment of the present invention, there is also a first heat sink, including a first fin base in contact with the first connection end and first fins evenly distributed on the first fin base, further taking away Heat on electrical internal components.

Through the layout of the ventilation slots of the internal components of the circuit breaker and the design of the external air guide structure, an overall heat dissipation air duct structure scheme is formed inside the circuit breaker to meet the requirements of the circuit breaker for low-temperature rise operation, especially suitable for large-capacity, long-term full-load operation occasions.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the heat dissipation structure of the circuit breaker involved in the present invention

Fig. 2 is a side sectional view of the overall structure of the heat dissipation structure of the circuit breaker involved in the present invention

Figure 3 is the internal structure of the circuit breaker body involved in the present invention

Figure 4 is a schematic diagram of the back of the circuit breaker involved in the present invention

Fig. 5 is a schematic diagram of the heat dissipation structure of the circuit breaker electrical connection assembly involved in the present invention

Fig. 6 is a schematic structural view of the first radiator involved in the present invention

Fig. 7 is a schematic structural view of the contact conductive sheet involved in the present invention

Fig. 8 is a schematic structural view of the second heat sink involved in the present invention

Fig. 9 is a structural schematic diagram of the ventilation cover of the circuit breaker heat dissipation structure involved in the present invention

Fig. 10 is a structural schematic diagram of the protective cover of the circuit breaker heat dissipation structure involved in the present invention

Figure 11 is a schematic diagram of the heat dissipation path of the electrical connection assembly involved in the present invention

Fig. 12 is a schematic diagram of the heat dissipation path of the circuit breaker heat dissipation structure without a ventilation cover according to the present invention

Fig. 13 is a schematic diagram of the heat dissipation path of Embodiment 1 of the ventilation hood of the heat dissipation structure of the circuit breaker according to the present invention

Fig. 14 is a schematic diagram of the heat dissipation path of the second embodiment of the ventilation cover of the circuit breaker heat dissipation structure of the present invention

Fig. 15 is a schematic diagram of the heat dissipation path of Embodiment 3 of the ventilation hood of the circuit breaker heat dissipation structure of the present invention

Detailed ways

The characteristics and exemplary embodiments of various aspects of the application will be described in detail below. In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only intended to explain the present application rather than limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

Mark Description:

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

Drawer seat 2, centralized heat dissipation channel 200;

insulating case 3,

The first radiator 31, the first fin 311, the first fin base 312;

Contact conductive sheet 32, first connection end 321, middle section 322, second connection end 323, ventilation groove 324, flexible groove 325;

The second radiator 33, the second rear fin group 331, the air guide groove 332, the second front fin group 333, and the second fin base 334;

Vertical air duct 301;

Horizontal air duct 302;

Side wall air duct 303;

ventilation hood 4,

Exhaust port 41, wind collecting hood 42, inter-channel deflector 43, interphase deflector 44, first channel 401, second channel 402, third channel 403;

Wiring block 5, internal terminal 51, external terminal 52;

Isolation cover 6, first ventilation hole 61, second ventilation hole 62, third ventilation hole 63, installation buckle 64;

Electrical connection assembly 7, fastening device 71, first end 72, second end 73, middle cavity 74;

The first direction X, the second direction Y, the third direction Z

In order to better understand the idea of the present invention, further elaboration will be made below in conjunction with the accompanying drawings.

As shown in Figures 1 to 15, in order to achieve the above purpose, the present invention designs a heat dissipation structure of a circuit breaker, including a circuit breaker body 1, a drawer seat 2, and a contact system. The circuit breaker body 1 has a first body busbar 11 and The second body bus bar 12, the first body bus bar 11 and the second body bus bar 12 are arranged up and down in the second direction to form the incoming line bar and outgoing line bar of the circuit breaker body 1, and are electrically connected through the contact system , forming a current pole; the contact system includes a moving contact 13, a static contact 14 located on the first body bus bar 11, a soft connection 15 is welded or fixedly connected to the moving contact 13, and the soft connection is connected to the second body bus bar 12 Fixed connection, when the moving contact 13 contacts the static contact 14, the first body bus bar 11 and the second body bus bar 12 form a conductive path.

The circuit breaker body 1 can be installed on the drawer seat 2, and can move on the drawer seat 2, as shown in Figure 2, when the circuit breaker body 1 moves to the right in the first direction X, the body busbars 11, 12 can be connected with their respective The corresponding electrical connection device 7 contacts, so that the body 1 is electrically connected to the drawer seat 2; when the circuit breaker body 1 moves leftward in the first direction X, the main body busbars 11, 12 can be separated from the respective corresponding electrical connection devices 7 contact, so that the main body 1 and the drawer seat 2 are electrically disconnected. The drawer base 2 has an insulating housing 3 on which an electrical connection assembly 7 is installed.

As shown in FIG. 6 , the first heat sink 31 includes a first fin base 312 in contact with the first connection end 321 of the contact conductive sheet 32 , and a plurality of fins 311 evenly distributed on the first fin base 312 .

As shown in FIG. 7 , the contact conductive strip 32 includes a first connection end 321 and a second connection end 323 , and the middle section 322 connects the first connection end 321 and the second connection end 323 . The middle section 322 is flexible and bendable, for example, it can be made of laminated copper foil, and there are ventilation slots 324 and flexible slots 325 on it, wherein the ventilation slots 324 are used to form heat dissipation channels and improve the flexibility of the middle section 322 , the openings of the flexible grooves 325 are smaller than those of the ventilation 324, and are evenly distributed on the middle section 322, further increasing the flexibility. In essence, the number of ventilation slots 324 needs to be compromised on the efficiency of ventilation and heat dissipation and the current-carrying cross-section of the contact conductive sheet 32, so it is not appropriate to set too many, so that the body busbars 11 and 12 of multiple current electrodes can be inserted into the electrical connection device at the same time 7, to deal with the deviations in the manufacturing and installation of multiple main body busbars 11 and 12, it is necessary to further increase the bending deflection performance of the middle section 322 to reduce the resistance of insertion and the comfort of operation. Small elongated flexible slot 325.

As shown in FIG. 8 , the second heat sink 33 includes a second fin base 334 in contact with the second connection end 323 of the contact conductive sheet 32 , and a second front fin group 333 and a second rear fin group 331 with different fin distribution forms. After the second heat sink 33 is installed on the electrical connection assembly 7, the second front fin group 333 is roughly distributed around the periphery of the fastening device 71 in an at least partially surrounded manner, or the fastening device 71 passes through the second front fin group The distribution area of 333 installs the second heat sink 33, the contact conductive sheet 32 and the main body busbar together. The second rear fin group 331 has multiple groups, and there is an air guide groove 332 between the two groups of second rear fin assemblies 331, and the air guide groove 332 can be set to communicate with the ventilation groove 324 contacting the conductive sheet 32 to form The first cooling channel. In the embodiment shown in the present invention, a plurality of air guide grooves 332 are directly aligned and communicated with a plurality of ventilation grooves 324 to form heat dissipation channels. Of course, on the premise of not affecting the ventilation efficiency, the corresponding air guide grooves 332 and the ventilation The grooves 324 can communicate with each other through a certain meandering path.

As shown in FIG. 9 , a ventilation cover 4 is installed on the top of the insulating housing 3 of the drawer base 2 , which communicates with 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, and the air collecting hood is sealed and connected with the drawer base 2 insulating housing 3 and installed on the top of the drawer base 2 to form a closed cover heat dissipation channel around, so that the air flow can only move upwards, leaving a gap on the upper part of the ventilation hood 4. There is an exhaust port 41 communicating with the atmosphere, wherein the exhaust port 41 is mainly used for further filtering the air flow. Based on a multi-pole circuit breaker, each current pole has a first heat dissipation channel, so interphase deflectors 44 are arranged between the wind collecting hoods of adjacent current poles, if there are multiple first cooling channels in each current pole For a heat dissipation channel, an inter-channel deflector 43 is further provided in each air collecting hood to form a second heat dissipation channel in the ventilation hood. In this way, each first heat dissipation channel communicates with its own second heat dissipation channel without interfering with each other.

As shown in Figure 10, after the first heat sink 31 is installed on the electrical connection device 7, since it is exposed to the external environment, long-term use of dust accumulation will affect the heat dissipation efficiency, so an isolation cover 6 with dustproof and ventilation functions is installed outside it, according to The different profiles of the first heat sink 31 can be provided with dust-proof ventilation holes on a plurality of 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, through The installation buckle 64 can be conveniently installed and disassembled on the circuit breaker.

The installation and arrangement of various components in the circuit breaker will be further described below to further understand the working principle of the technology of the present invention.

As shown in Fig. 2 to Fig. 5, in order to connect with the external load, the drawer seat 2 also has a terminal block 5, and the inner terminal 51 of the terminal block 5 is in conductive contact with the second end 73 of the electrical connection assembly 7, more specifically, it is electrically connected The second end of the device 7 and the external end 52 pass through the insulating casing 3 and are connected to the external load; the drawer base 2 has a first heat dissipation channel in the second direction Y, and the heat dissipation channel passes through the electrical connection assembly 7 and is formed at the position of the electrical connection assembly Heat dissipation space and heat dissipation path, according to the principle of air convection, hot air moves from bottom to top and is discharged from the drawer seat.

The electrical connection assembly includes a contact conductive sheet 32, and the contact conductive sheet 32 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 any connection end to shift, that is, to fix any connection end, the other connection end can still be shifted or deflected 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, that is, the electrical connection assembly forms a bus bar with the circuit breaker body 1 by contacting the first connection end 321 of the conductive sheet 32 The first end connected to the electrical connection assembly forms a second end connected to the terminal by contacting the second connection end 323 of the conductive sheet 32 . The middle section 322 has a ventilation slot 324, and the first heat dissipation channel inside the drawer seat includes a ventilation slot 324; the ventilation slots 324 of the electrical connection components arranged above and below the same current pole communicate, that is, one current pole has at least two electrical connections Component 7, two electrical connection components 7 are arranged up and down in the second direction, correspondingly connected to the bus bars 11 and 12 of the circuit breaker body 1, and the ventilation slots 324 of the upper and lower two electrical connection components 7 communicate to form a smooth first heat dissipation channel .

As shown in Figure 2 and Figure 9, the heat dissipation structure of the circuit breaker also includes a ventilation cover 4, which is installed on the top of the drawer seat 2, and there is a second heat dissipation channel in the second direction inside the ventilation cover 4, and the second heat dissipation channel The passage is located above the first heat dissipation passage in the second direction, and communicates with the first heat dissipation passage, so that the hot air discharged by the first heat dissipation passage passes through the second heat dissipation passage and reaches the external space.

The lower part of the ventilation hood 4 is a wind collecting hood, and the air collecting hood is sealedly connected with the drawer base 2 insulating housing 3 and installed above the drawer base 2 to form a closed cooling channel around the cover. An exhaust port 41 is left on the upper part of the ventilation hood 4 to communicate with the atmosphere. Connected, the exhaust port 41 has a filtering function for the airflow, preventing metal particles from flowing out of the circuit breaker; the inner space of the wind collecting hood corresponds to the position of the ventilation groove 324 on the contact conductive sheet 32, forming the first heat dissipation channel and the second heat dissipation channel connectivity. In this embodiment, the second heat dissipation channel is roughly aligned with the first heat dissipation channel, so as to fully improve the heat dissipation efficiency of the entire heat dissipation structure.

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

Based on the greater heat generation of the high-current circuit breaker, the contact conductive sheet 32 of the electrical connection assembly is wider in the third direction, so a plurality of ventilation slots 324 can be arranged to form respective first heat dissipation channels, that is to say, each electrical connection There are a plurality of paths forming the first heat dissipation channel on the component 7 to increase the heat dissipation effect; there is an inter-channel deflector in the ventilation cover 4 of each current pole, and the second heat dissipation channel of each current pole is divided into multiple channels, and the Each channel communicates with the respective ventilation groove 324, that is, the path corresponding to a plurality of first heat dissipation channels, and the second heat dissipation channel is also divided into a plurality of channels that do not interfere with each other, so that the multiple first heat dissipation channels in each current pole High-temperature gas does not interfere with each other in the fume hood 4 .

As shown in Figures 5 and 8, the electrical connection assembly 7 also includes a second heat sink 33, the second heat sink 33 has an air guide groove 332, and the first heat dissipation channel includes an air guide groove 332; the second heat sink 33 contacts Installed on the electrical connection component, further enhancing the heat dissipation capability of the electrical connection component. The electrical connection assembly also includes a fastening device 7, which sequentially clamps the second heat sink 33, the contact conductive sheet 32 and the body busbar; the second heat sink 33 includes a second rear fin group 331, a second front fin group 333, and a second fin group 333. Two wing bottoms 334; the second wing bottom 334 is in contact with the contact conductive sheet 32 to form heat conduction; the second rear fin group 331 has multiple groups, and the air guide groove 332 is located in two adjacent groups of the second rear fin group 331 Between; the second set of front fins 333 at least partially surrounds the fastening means. In this way, the second heat sink 33 can take away part of the heat of the electrical connection assembly, and the air guide slots 332 are aligned with the ventilation slots 324 , so the number is also corresponding.

The electrical connection assembly includes a contact conductive sheet 32, and the contact conductive sheet 32 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 any connection end to shift, that is, to fix any connection end, the other connection end can still be shifted or deflected 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, that is, the electrical connection assembly forms a bus bar with the circuit breaker body 1 by contacting the first connection end 321 of the conductive sheet 32 The first end connected to the electrical connection assembly forms a second end connected to the terminal by contacting the second connection end 323 of the conductive sheet 32 . The middle section 322 has a ventilation slot 324, and the first heat dissipation channel inside the drawer seat includes a ventilation slot 324; the ventilation slots 324 of the electrical connection components arranged above and below the same current pole communicate, that is, one current pole has at least two electrical connections Component 7, two electrical connection components 7 are arranged up and down in the second direction, correspondingly connected to the bus bars 11 and 12 of the circuit breaker body 1, and the ventilation slots 324 of the upper and lower two electrical connection components 7 communicate to form a smooth first heat dissipation channel . The air guiding groove communicates with the ventilation groove 324 , that is, the air guiding groove of the second heat sink 33 becomes a part of the first heat dissipation channel.

As shown in Figure 11, the contact conductive sheet 32 and the second heat sink 33 are stacked and assembled, and placed together in the insulating housing 3 of the drawer base 2, keeping a certain distance from both sides of the insulating housing 3 of the drawer base 2, naturally forming an up-down communication The side wall air channels 303 are formed on both sides of the electrical connection assembly. The ventilation groove 324 on the contact conductive sheet 32 and the inter-wing air guide groove 332 on the second heat sink 33 communicate up and down, forming a vertical air duct 301 naturally; hole, forming the horizontal air duct 302 naturally. In this way, the side wall air duct 303 , the vertical air duct 301 and the horizontal air duct 302 jointly form an optimized first heat dissipation channel, which greatly improves the heat dissipation effect. The intermediate cavity is formed by tightening the space between the two contact conductive sheets 32 on both sides of the busbar of the body. The holes in the middle make the adjacent first heat dissipation channels communicate with each other at the contacting conductive sheet 32 , resulting in the effect of lateral circulation, which can take away heat from the surface of the contacting conductive sheet 32 .

According to another embodiment of the present invention, there is also a first radiator 31, including a first fin base 312 contacted by a first connection end 321 and first fins 311 evenly distributed on the first fin base 312, further taking away Heat on electrical internal components.

As shown in Figures 12 to 15,

If the ventilation cover 4 is not installed, the airflows flowing out from the multiple first cooling channels are diffuse and interfere with each other, and the ventilation efficiency is not high.

After the ventilation cover 4 is installed, the second heat dissipation passage is formed through the first passage 401 to generate a chimney effect and improve the efficiency of the air flow upward. It is further found that if the interphase deflector 44 is not provided in the ventilation hood 4, the airflow from the first heat dissipation channel will flow laterally, which will interfere with the airflow of adjacent current poles and affect the ventilation efficiency. After adding the interphase deflector 44 , through the second channel 402 to form a second heat dissipation channel with each current pole independent, it can be seen that each second channel 402 does not interfere with each other, and the effect is better than that of the first channel 401 .

If a plurality of first cooling channels are arranged in each current pole, in order to ensure that adjacent airflows do not interfere with each other, an inter-channel deflector 43 can be further provided in each second channel 402 to form a plurality of third channels 403 enables each current pole to have a plurality of second heat dissipation channels corresponding to its respective first heat dissipation channels, thus ensuring the ventilation efficiency of each first heat dissipation channel in each current pole.

It should be noted that in this article, relational terms such as first and second, front and back, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

Although the embodiments disclosed in the present application are as above, the described content is only the embodiments adopted for the convenience of understanding the application, and is not intended to limit the present invention. Anyone skilled in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the protection scope of this application remains the same. The scope defined by the appended claims shall prevail.

The above is only the specific implementation of the present application, and those skilled in the art can clearly understand that for the convenience and brevity of the description, for the replacement of other connection methods described above, you can refer to the corresponding The process will not be repeated here. It should be understood that the protection scope of the present application is not limited thereto, and any person familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the application, and these modifications or replacements should cover all Within the protection scope of this application.

Claims (11)

1. A circuit breaker heat dissipation structure, including a circuit breaker body (1), a drawer seat (2), a contact system, The circuit breaker body (1) has a first body busbar (11) and a second body busbar (12), and the first body busbar (11) and the second body busbar (12) are arranged in the second direction (Y ) are arranged up and down to form the incoming line bar and outgoing line bar of the circuit breaker body, and are electrically connected through the contact system to form a current pole; The drawer seat (2) has an electrical connection assembly (7) and an insulating housing (3); The circuit breaker body (1) can enter or leave the drawer seat (2) in the first direction (X), so that the first body busbar (11), the second body busbar (12) and the respective electrical connection components ( 7) The first end of the contact or separation; It also includes a terminal block (5), the internal terminal of the terminal block (5) is in contact with the second end of the electrical connection component (7), and the external terminal is connected to an external circuit; It is characterized in that 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). 2. The circuit breaker heat dissipation structure according to claim 1, characterized in that, the electrical connection assembly (7) includes a contact conductive sheet (32), The contact conductive sheet (32) includes a first connection end (321), a second connection end (323), and a middle section (322), and the middle 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) respectively form the first end and the second end of the electrical connection assembly (7), The middle section (322) has a ventilation slot (324), so the first heat dissipation channel includes a ventilation slot (324); The ventilation slots (324) of the electrical connection components (7) arranged above and below the same current pole communicate with each other. 3. The circuit breaker heat dissipation structure according to claim 2, characterized in that it also includes a ventilation cover (4), the ventilation cover (4) is installed on the top of the drawer seat (2), and has a function in the second direction ( The second heat dissipation channel on Y), the second heat dissipation channel is located above the first heat dissipation channel in the second direction (Y), and communicates with the first heat dissipation channel. 4. The circuit breaker heat dissipation structure according to claim 3, characterized in that, the lower part of the ventilation hood (4) is an air collecting hood (42), and the air collecting hood (42) is connected with the drawer base insulating housing (3) The airtight connection is installed above the drawer base (2) to form a first airtight passage (401) around, and an exhaust port (41) is left on the upper part of the ventilation cover (4) to communicate with the atmosphere; the second heat dissipation passage includes the first channel(401); The inner space of the wind collecting hood (42) is above the position corresponding to the position of the ventilation groove (324) on the contact conductive sheet (32). 5. The heat dissipation structure of a circuit breaker according to claim 4, characterized in that there are at least two current poles arranged in the third direction (Z), and each current pole is arranged with a ventilation cover (4) , Interphase deflectors (44) are arranged between adjacent ventilation hoods (4) to separate the second heat dissipation passages of adjacent ventilation hoods (4). 6. The circuit breaker heat dissipation structure according to claim 5, characterized in that, the contact conductive sheet (32) of the electrical connection assembly (7) is arranged with a plurality of ventilation slots (324) in the third direction (Z), and form respective first heat dissipation channels; The ventilation cover (4) of each current pole has an inter-channel deflector (43), which divides the second heat dissipation passage of each current pole into a plurality of passages, and the plurality of passages are connected with the respective first heat dissipation passages. connected. 7. The circuit breaker cooling structure according to claim 1, characterized in that, the electrical connection assembly (7) further comprises a second radiator (33), and the second radiator (33) has an air guide groove ( 332), so the first cooling channel includes air guide grooves (332); The second radiator (33) is mounted in contact with the electrical connection component (7). 8. The circuit breaker heat dissipation structure according to claim 7, characterized in that, the electrical connection assembly (7) comprises a contact conductive sheet (32), The contact conductive sheet (32) includes a first connection end (321), a second connection end (323), and a middle section (322), and the middle 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) respectively form the first end and the second end of the electrical connection assembly (7), The middle section (322) has a ventilation slot (324), so the first heat dissipation channel includes a ventilation slot (324); The ventilation slots (324) of the electrical connection components (7) arranged above and below the same current pole are connected; The air guiding groove (332) communicates with the ventilation groove (324). 9. The circuit breaker heat dissipation structure according to claim 8, characterized in that, the electrical connection assembly (7) also includes a fastening device (71), which sequentially clamps the second heat sink (33), the contact conductive sheet ( 32) with the body busbar (11, 12); The second radiator (33) includes a second rear fin group (331), a second front fin group (333), and a second fin bottom (334); The second wing bottom (334) is in contact with the contact conductive sheet (32); The second rear fin group (331) has a plurality of air guide grooves (332) located between adjacent second rear fin groups (331); Said second set of front fins (333) at least partially surrounds the fastening means. 10. The heat dissipation structure of the circuit breaker according to claim 8, characterized in that, the contact conductive sheet (32) is stacked and assembled with the second heat sink (33) and placed together in the drawer base insulating case (3) , keeping a certain distance from the two sides of the drawer seat insulation housing (3), naturally forming a side wall air duct (303) connecting up and down; The ventilation groove (324) on the contact conductive sheet (32) and the inter-wing air guide groove (332) on the second heat sink (33) communicate up and down, naturally forming a vertical air duct (301); The middle cavity where the contact conductive sheet (32) contacts and connects with the main body busbar (11) forms a transverse air duct (302). 11. The heat dissipation structure of a circuit breaker according to claim 2 or 8, characterized in that it also has a first heat sink (31), including a first fin bottom (312) in contact with the first connection end (321) and first fins (311) uniformly distributed on the first fin base (312).

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