circuit breaker

Abstract

The utility model discloses a circuit breaker relates to circuit breaker technical field, wherein, circuit breaker includes circuit breaker body, and circuit breaker body includes detection mechanism and tripping mechanism, and circuit breaker still includes sealing shell and heat abstractor, and sealing shell includes shell body and partition, and the inside of shell body has the closed space, and partition is used for dividing the closed space into mounting space and heat dissipation space, and circuit breaker body is located in mounting space, heat abstractor includes semiconductor refrigeration piece, heat dissipation fin and fan assembly. First fan draws the air in mounting space from air inlet and enters heat dissipation space, and this part temperature higher air can contact with the cold end surface of semiconductor refrigeration piece and exchanges heat, and the air after cooling will be driven under the second fan, and from air outlet returns mounting space, thereby realizes the cooling of mounting space, and then makes the temperature in sealing shell maintain in a suitable temperature interval of circuit breaker body work, and effectively prolongs the service life of circuit breaker.

Description

Technical Field

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

[0002] Currently, common circuit breakers generally consist of a casing and a detection mechanism and a tripping mechanism housed within the casing. During daily operation, the internal busbars of a circuit breaker continuously generate heat. Furthermore, due to the presence of microscopic protrusions on the contact surfaces of the moving and stationary contacts, the actual contact area is smaller than the directly visible contact area, resulting in concentrated resistance. The heat generated here can reach tens of watts. Therefore, existing circuit breakers generally require heat dissipation holes on the casing for heat dissipation. However, directly opening heat dissipation holes on the casing would cause the internal detection and tripping mechanisms of the circuit breaker to come into direct contact with the external environment, which would affect their service life. Utility Model Content

[0003] The main purpose of this utility model is to propose a circuit breaker that aims to improve the service life of the circuit breaker.

[0004] To achieve the above objectives, the circuit breaker proposed in this utility model includes a detection mechanism and a tripping mechanism connected to each other, and the circuit breaker further includes: A sealed housing, comprising a housing body and a partition plate disposed inside the housing body, wherein the housing body has a sealed space inside, and the partition plate is used to divide the sealed space into an installation space and a heat dissipation space, and the circuit breaker body is located in the installation space; The heat dissipation mechanism includes a thermoelectric cooler, heat sink fins, and a fan assembly. The housing body has an opening communicating with the heat dissipation space. The heat sink fins are disposed on the outer side of the housing body and are used to seal the opening. The thermoelectric cooler includes a hot end face and a cold end face disposed opposite to each other. The hot end face is in contact with the heat sink fins through the opening, and the cold end face faces the heat dissipation space. The fan assembly includes a first fan and a second fan. An air inlet and an air outlet communicating with the mounting space and the heat dissipation space are provided on a partition plate. The air inlet and the air outlet are spaced apart and located on opposite sides of the circuit breaker body, and also on opposite sides of the thermoelectric cooler. The first fan is located at the air inlet, with its outlet facing the heat dissipation space. The second fan is located at the air outlet, with its outlet facing the mounting space.

[0005] In one embodiment, the circuit breaker further includes an isolation housing connected to the outer wall of the housing body, the isolation housing and the housing body forming an accommodating space, the heat dissipation fins being located within the accommodating space, and the isolation housing having an air inlet and an air outlet for communicating the accommodating space with the external environment.

[0006] In one embodiment, the fan assembly further includes a third fan disposed within the accommodating space, with the air intake side of the third fan facing the heat dissipation fins and the air outlet side of the third fan facing the air outlet, so that the airflow entering the accommodating space from the air intake can leave the accommodating space from the air outlet under the drive of the third fan after heat exchange with the heat dissipation fins.

[0007] In one embodiment, the isolation housing has at least one air inlet on each of its two sidewalls arranged opposite to each other along a first direction, and at least one air outlet on the sidewall of the isolation housing away from the sealing housing along a second direction. The first direction and the second direction are perpendicular, and both the air inlet and the air outlet are oriented toward the heat dissipation fins.

[0008] In one embodiment, the fan assembly further includes a fourth fan. The two sidewalls of the isolation housing, which are arranged opposite each other along a first direction, are respectively provided with the air inlet and the air outlet. The heat dissipation fins and the fourth fan are spaced apart along the first direction. The air inlet side of the fourth fan faces the air inlet, and the air outlet side of the fourth fan faces the air outlet, so that the airflow entering the accommodating space from the air inlet can exchange heat with the heat dissipation fins under the drive of the fourth fan and then leave the accommodating space from the air outlet.

[0009] In one embodiment, the circuit breaker further includes a first dustproof mesh and a second dustproof mesh, both of which are connected to the isolation housing. The first dustproof mesh is disposed at the air inlet, and the second dustproof mesh is disposed at the air outlet.

[0010] In one embodiment, the circuit breaker further includes a deflector assembly, the deflector assembly including a first deflector located on the air outlet side of the first fan, the first deflector being used to guide the airflow blown from the first fan to the cold end face.

[0011] In one embodiment, the deflector assembly further includes a second deflector located on the air inlet side of the second fan. The second deflector is used to guide the airflow after heat exchange with the cold end face to flow towards the air inlet side of the second fan.

[0012] In one embodiment, the circuit breaker further includes heat-conducting fins, each heat-conducting fin comprising a base plate and heat-conducting plates connected to each other, and a plurality of heat-conducting plates, wherein an airflow channel for airflow is formed between any two adjacent heat-conducting plates, and the side of the base plate opposite to the heat-conducting plates is connected to the cold end face.

[0013] In one embodiment, the heat dissipation space is located above the mounting space.

[0014] The technical solution of this utility model uses a sealed outer shell to house the circuit breaker body in a closed space, thereby isolating the circuit breaker body from the external environment. This prevents moisture or impurities from entering the sealed space, avoiding corrosion of the circuit breaker body due to contact with external moisture or impurities, and extending the service life of the circuit breaker. Furthermore, the heat generated by the circuit breaker body will raise the temperature in the installation space. The first fan draws air from the installation space into the heat dissipation space through the air inlet. This warmer air comes into contact with the cold end face of the semiconductor cooling chip and exchanges heat, thereby cooling the air. The cooled air is then driven by the second fan and returns to the installation space through the air outlet, thus cooling the installation space. This maintains the temperature inside the sealed outer shell within a suitable operating temperature range for the circuit breaker body, reducing the probability of a significant reduction in the service life of the circuit breaker body due to excessively high internal temperature of the sealed outer shell, and effectively extending the service life of the circuit breaker. Attached Figure Description

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

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the circuit breaker provided by this utility model; Figure 2 A partial structural schematic diagram of an embodiment of the circuit breaker provided by this utility model; Figure 3 A partial structural cross-sectional schematic diagram of an embodiment of the circuit breaker provided by this utility model; Figure 4 A schematic diagram of the airflow direction of the internal gas circulation in the circuit breaker provided by this utility model.

[0017] Explanation of icon numbers: 100. Circuit breaker; 1. Circuit breaker body; 2. Sealed housing; 21. Housing body; 211. Opening; 22. Partition plate; 221. Air inlet; 222. Air outlet; 23. Enclosed space; 231. Installation space; 232. Heat dissipation space; 31. Semiconductor cooling chip; 311. Cold end face; 312. Hot end face; 32. Heat dissipation fins; 321. Mounting plate; 322. Heat dissipation fins; 331. First fan; 332. Second fan; 333. Third fan; 4. Isolation housing; 41. Air inlet; 42. Air outlet; 43. Accommodation space; 5. Air guide plate assembly; 51. First air guide plate; 52. Second air guide plate; 6. Heat-conducting fins.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] Currently, common circuit breakers generally consist of a casing and a detection mechanism and a tripping mechanism housed within the casing. During daily operation, the internal busbars of a circuit breaker continuously generate heat. Furthermore, due to the presence of microscopic protrusions on the contact surfaces of the moving and stationary contacts, the actual contact area is smaller than the directly visible contact area, resulting in concentrated resistance. The heat generated here can reach tens of watts. Therefore, existing circuit breakers generally require heat dissipation holes on the casing for heat dissipation. However, directly opening heat dissipation holes on the casing would cause the internal detection and tripping mechanisms of the circuit breaker to come into direct contact with the external environment, which would affect their service life.

[0023] The inventors discovered that existing circuit breakers are prone to corrosion in environments with high humidity or acidity, and this corrosion can seriously affect the service life of the circuit breaker.

[0024] In view of this, the present invention proposes a circuit breaker, which aims to improve the service life of the circuit breaker.

[0025] Please see Figure 1 , Figure 3 and Figure 4 In one embodiment of this utility model, the circuit breaker 100 includes a circuit breaker body 1, which includes a detection mechanism and a tripping mechanism connected to each other. The circuit breaker 100 also includes a sealed housing 2 and a heat dissipation mechanism. The sealed housing 2 includes a housing body 21 and a partition plate 22 disposed inside the housing body 21. The housing body 21 has a sealed space 23 inside. The partition plate 22 is used to divide the sealed space 23 into an installation space 231 and a heat dissipation space 232. The circuit breaker body 1 is located in the installation space 231. The heat dissipation mechanism includes a thermoelectric cooler 31, heat dissipation fins 32 and a fan assembly. The housing body 21 has an opening 211 communicating with the heat dissipation space 232. The heat dissipation fins 32 are disposed on the outside of the housing body 21 and are used to seal the opening 211. The thermoelectric cooler 31 includes a heat sink 31 and a fan assembly. The circuit breaker body 1 has a hot end face 312 and a cold end face 311. The hot end face 312 is attached to the heat dissipation fins 32 through the opening 211, and the cold end face 311 faces the heat dissipation space 232. The fan assembly includes a first fan 331 and a second fan 332. The partition plate 22 has an air inlet 221 and an air outlet 222 that connect the installation space 231 and the heat dissipation space 232. The air inlet 221 and the air outlet 222 are spaced apart. The air inlet 221 and the air outlet 222 are located on both sides of the circuit breaker body 1, and the air inlet 221 and the air outlet 222 are also located on both sides of the semiconductor cooling chip 31. The first fan 331 is located at the air inlet 221, and the air outlet side of the first fan 331 faces the heat dissipation space 232. The second fan 332 is located at the air outlet 222, and the air outlet side of the second fan 332 faces the installation space 231.

[0026] The technical solution of this utility model isolates the circuit breaker body 1 from the external environment by using a sealed outer shell 2 to house the circuit breaker body 1 within a sealed space 23. This prevents moisture, corrosive gases, or other foreign objects from entering the sealed space 23, thus avoiding corrosion of the circuit breaker body 1 due to direct contact with these substances and extending the service life of the circuit breaker 100. Furthermore, the heat generated by the circuit breaker body 1 raises the temperature within the installation space 231, and the first fan 331 draws air from the installation space 231 into the heat dissipation space 232 through the air inlet 221. The warmer air comes into contact with the cold end face 311 of the thermoelectric cooler 31 and exchanges heat, thus cooling the air. The cooled air, driven by the second fan 332, returns from the outlet 222 to the installation space 231, further cooling the installation space 231. This cycle repeats, achieving internal airflow circulation within the sealed housing 2, maintaining the temperature inside the sealed housing 2 within a suitable operating range for the circuit breaker body 1. This reduces the probability of a significant reduction in the service life of the circuit breaker body 1 due to excessively high internal temperatures, effectively extending the service life of the circuit breaker 100. It should be noted that the hot end face 312 is connected to and exchanges heat with the heat sink 32. The heat sink 32 increases the contact area between the hot end face 312 and the external environment, significantly improving the heat dissipation efficiency of the hot end face 312, thereby ensuring the normal operation of the thermoelectric cooler 31. It should also be noted that the detection mechanism, tripping mechanism, and thermoelectric cooler 31 are all existing structures. The isolation of the circuit breaker body 1 from the external environment by the housing 21 can be achieved using an existing housing. The fan assembly is also an existing fan. In addition, the power source for the thermoelectric cooler 31 and the fan assembly can be a power supply installed inside the sealed housing 2 or an external power supply. The power supply method can be achieved using existing power supplies, and no specific restrictions are made here.

[0027] According to one embodiment of the present invention, the heat dissipation fin 32 includes an interconnected mounting plate 321 and a plurality of heat dissipation fins 322. The side of the mounting plate 321 facing away from the heat dissipation fins 322 is connected to the outer wall of the sealing shell 2 through a sealing layer. The sealing layer is arranged around the opening 211. One side of the sealing layer is sealed to the outer wall of the sealing shell 2, and the other side of the sealing layer is sealed to the mounting plate 321, thereby realizing the sealing of the opening 211 by the heat dissipation fin 32.

[0028] According to another embodiment of the present invention, a sealing ring is provided on the inner wall of the opening 211. The heat dissipation fin 32 includes an interconnected mounting plate 321 and a plurality of heat dissipation fins 322. The side of the mounting plate 321 away from the heat dissipation fins 322 protrudes in a direction away from the heat dissipation fins 322 to form an insertion part. The insertion part is used to insert the inner ring of the sealing ring so that the inner ring of the sealing ring can be arranged around the periphery of the insertion part, thereby realizing the sealing of the opening 211 by the heat dissipation fin 32.

[0029] Please see Figures 1 to 3 In one embodiment, the circuit breaker 100 further includes an isolation housing 4, which is connected to the outer wall of the housing body 21. The isolation housing 4 and the housing body 21 form an accommodating space 43, within which the heat dissipation fins 32 are located. The isolation housing 4 has an air inlet 41 and an air outlet 42, which connect the accommodating space 43 to the external environment. By setting the isolation housing 4 and the housing body 21 to form the accommodating space 43, the heat dissipation fins 32 are placed within the accommodating space 43, reducing the probability of foreign objects or impurities directly adhering to the heat dissipation fins 32 and ensuring the heat dissipation efficiency of the heat dissipation fins 32. It should be noted that external air enters the accommodating space 43 through the air inlet 41, thereby exchanging heat with the heat dissipation fins 32 located in the accommodating space 43. The heated air then leaves the accommodating space 43 through the air outlet 42. This cycle is repeated to effectively dissipate heat from the heat dissipation fins 32, and in turn, effectively dissipate heat from the hot end face 312. This provides a certain guarantee that the semiconductor cooling chip 31 can provide sufficient cooling capacity. If the semiconductor cooling chip 31 can provide sufficient cooling capacity, it can ensure that the sealed space 23 is maintained within a temperature range that allows the circuit breaker body 1 to operate normally, thereby effectively improving the service life of the circuit breaker 100.

[0030] Please see Figure 2In one embodiment, the fan assembly further includes a third fan 333, which is disposed within the accommodating space 43. The air inlet side of the third fan 333 faces the heat dissipation fins 32, and the air outlet side of the third fan 333 faces the air outlet 42. This allows the airflow entering the accommodating space 43 from the air inlet 41 to exit the accommodating space 43 from the air outlet 42 after heat exchange with the heat dissipation fins 32, driven by the third fan 333. By adding the third fan 333, the airflow rate within the accommodating space 43 is increased, thereby effectively improving the heat dissipation efficiency of the heat dissipation fins 32 and ensuring sufficient cooling for the thermoelectric cooler 31. It should be noted that the third fan 333 accelerates the airflow rate within the container space, allowing outside air to enter the accommodating space 43 more quickly through the air inlet 41. After the airflow exchanges heat with the heat dissipation fins 32, the temperature-increasing airflow will quickly leave the accommodating space 43 through the air outlet 42 under the drive of the third fan 333. This cycle repeats, thereby improving the heat dissipation efficiency of the heat dissipation fins 32 and effectively dissipating heat from the hot end face 312. This provides a certain guarantee that the thermoelectric cooler 31 can provide sufficient cooling. If the thermoelectric cooler 31 can provide sufficient cooling, it can ensure that the sealed space 23 is maintained within a temperature range suitable for the normal operation of the circuit breaker body 1, thereby effectively improving the service life of the circuit breaker 100.

[0031] Please see Figure 2 In one embodiment, the isolation shell 4 has at least one air inlet 41 on each of its two opposite sidewalls along a first direction, and at least one air outlet 42 on the sidewall of the isolation shell 4 away from the sealing shell 2 along a second direction. The first and second directions are perpendicular, and both the air inlet 41 and the air outlet 42 are oriented towards the heat dissipation fins 32. By providing at least one air inlet 41 on each of the two opposite sidewalls of the isolation shell 4 along the first direction, air can be introduced from both sides simultaneously. External airflow enters the accommodating space 43 from both sides of the isolation shell 4, thereby increasing the amount of airflow entering the accommodating space 43. More airflow can participate in the heat exchange with the heat dissipation fins 32, thus improving the heat dissipation efficiency of the heat dissipation fins 32. The presence of at least one air outlet 42 on the sidewall of the two opposite sidewalls of the isolation shell 4 away from the sealing shell 2 along the second direction effectively increases the amount of airflow, allowing the airflow that has completed heat exchange to leave the accommodating space 43 more quickly through the air outlet 42. It should be noted that the number of air outlets 42 is not less than the number of air inlets 41. It should also be noted that the heat sink 322 extends along the first direction, and multiple heat sinks 322 are spaced apart along the first direction and the second direction. The first direction is... Figure 2 The left and right directions are shown, and the second direction is... Figure 2 The front and back directions are shown.

[0032] In one embodiment, the fan assembly further includes a fourth fan. The two sidewalls of the isolation housing 4, arranged opposite each other along a first direction, are respectively provided with an air inlet 41 and an air outlet 42. The heat dissipation fins 32 and the fourth fan are spaced apart along the first direction. The air inlet side of the fourth fan faces the air inlet 41, and the air outlet side faces the air outlet 42, so that the airflow entering the accommodating space 43 from the air inlet 41 can exchange heat with the heat dissipation fins 32 under the drive of the fourth fan and then leave the accommodating space 43 from the air outlet 42. By setting the fourth fan, the rate at which outside air enters the accommodating space 43 through the air inlet 41 is accelerated. After entering the accommodating space 43, the airflow, driven by the fourth fan, flows through the heat dissipation fins 32 and exchanges heat with them, then continues to flow along the first direction until it leaves the accommodating space 43 from the air outlet 42. By setting the fourth fan, the airflow rate within the accommodating space 43 is accelerated, allowing the heat dissipation fins 32 to exchange heat with more air in the same amount of time, thereby effectively improving the heat dissipation efficiency of the heat dissipation fins 32.

[0033] In one embodiment, the circuit breaker 100 further includes a first dustproof mesh and a second dustproof mesh, both connected to the isolation housing 4. The first dustproof mesh is located at the air inlet 41, and the second dustproof mesh is located at the air outlet 42. By providing the first dustproof mesh at the air inlet 41, the probability of external dust or foreign objects entering the accommodating space 43 through the air inlet 41 is reduced, thus reducing the probability of the heat dissipation fins 32 being covered by dust and affecting heat dissipation efficiency. Similarly, by providing the second dustproof mesh at the air outlet 42, the probability of external dust or foreign objects entering the accommodating space 43 through the air outlet 42 is reduced, thus reducing the probability of the heat dissipation fins 32 being covered by dust and affecting heat dissipation efficiency. Both the first and second dustproof meshes are existing dustproof meshes.

[0034] Please see Figure 3 In one embodiment, the circuit breaker 100 further includes a guide vane assembly 5, which includes a first guide vane 51 located on the air outlet side of the first fan 331. The first guide vane 51 guides the airflow from the first fan 331 to the cold end face 311. By setting the first guide vane 51, the airflow from the first fan 331 is smoothly guided to the cold end face 311. Under the guidance of the first guide vane 51, the airflow can exchange heat with the cold end face 311 more quickly, improving heat exchange efficiency. This ensures that the enclosed space 23 can be maintained within a temperature range suitable for the normal operation of the circuit breaker body 1, thereby effectively extending the service life of the circuit breaker 100.

[0035] Please see Figure 3In one embodiment, the deflector assembly 5 further includes a second deflector 52 located on the air inlet side of the second fan 332. The second deflector 52 guides the airflow after heat exchange with the cold end face 311 to flow towards the air inlet side of the second fan 332. By providing the second deflector 52, the airflow whose temperature drops after heat exchange with the cold end face 311 is guided towards the air inlet side of the second fan 332, thereby accelerating the rate at which the airflow enters the installation space 231. This increases the internal circulation rate of the airflow within the sealed space 23, ensuring that the sealed space 23 can be maintained within a temperature range suitable for the normal operation of the circuit breaker body 1, and thus effectively improving the service life of the circuit breaker 100.

[0036] Please see Figure 3 In one embodiment, the circuit breaker 100 further includes heat-conducting fins 6, which include a base plate and heat-conducting sheets connected to each other. Multiple heat-conducting sheets are present, and an airflow channel is formed between any two adjacent heat-conducting sheets for airflow to pass through. The side of the base plate facing away from the heat-conducting sheets is connected to the cold end face 311. By providing heat-conducting fins 6, the contact area between the cold end face 311 and the air is increased. That is, the cold end face 311 transfers cooling energy to the heat-conducting fins 6. The contact area between the heat-conducting fins 6 and the air is larger than that of the cold end face 311. Therefore, the heat-conducting fins 6 can exchange heat with more airflow in the same amount of time, thereby improving the cooling efficiency of the cold end face 311 on the airflow. This ensures that the sealed space 23 can be maintained within a temperature range suitable for the normal operation of the circuit breaker body 1, thus effectively extending the service life of the circuit breaker 100.

[0037] Please see Figure 3 In one embodiment, the heat dissipation space 232 is located above the installation space 231. Since hotter gases rise, the hotter gases can quickly enter the heat dissipation space 232 through the air inlet 221 to exchange heat with the cold end face 311, thereby reducing the temperature. The cooled airflow then enters the installation space 231 from the air outlet 222. By prioritizing the cooling of the hotter airflow, the sealed space 23 can be maintained within a temperature range suitable for the normal operation of the circuit breaker body 1, thereby effectively improving the service life of the circuit breaker 100.

[0038] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A circuit breaker, the circuit breaker comprising a circuit breaker body, the circuit breaker body including a detection mechanism and a tripping mechanism interconnected thereto, characterized in that, The circuit breaker also includes: A sealed housing, comprising a housing body and a partition plate disposed inside the housing body, wherein the housing body has a sealed space inside, and the partition plate is used to divide the sealed space into an installation space and a heat dissipation space, and the circuit breaker body is located in the installation space; The heat dissipation mechanism includes a thermoelectric cooler, heat sink fins, and a fan assembly. The housing body has an opening communicating with the heat dissipation space. The heat sink fins are disposed on the outer side of the housing body and are used to seal the opening. The thermoelectric cooler includes a hot end face and a cold end face disposed opposite to each other. The hot end face is in contact with the heat sink fins through the opening, and the cold end face faces the heat dissipation space. The fan assembly includes a first fan and a second fan. An air inlet and an air outlet communicating with the mounting space and the heat dissipation space are provided on a partition plate. The air inlet and the air outlet are spaced apart and located on opposite sides of the circuit breaker body, and also on opposite sides of the thermoelectric cooler. The first fan is located at the air inlet, with its outlet facing the heat dissipation space. The second fan is located at the air outlet, with its outlet facing the mounting space.

2. The circuit breaker as described in claim 1, characterized in that, The circuit breaker also includes an isolation housing, which is connected to the outer wall of the housing body. The isolation housing and the housing body form an accommodating space. The heat dissipation fins are located within the accommodating space. The isolation housing has an air inlet and an air outlet, which are used to connect the accommodating space with the external environment.

3. The circuit breaker as described in claim 2, characterized in that, The fan assembly further includes a third fan disposed within the accommodating space. The air intake side of the third fan faces the heat dissipation fins, and the air outlet side of the third fan faces the air outlet, so that the airflow entering the accommodating space from the air intake can leave the accommodating space from the air outlet under the drive of the third fan after exchanging heat with the heat dissipation fins.

4. The circuit breaker as described in claim 3, characterized in that, The isolation shell has at least one air inlet on each of its two sidewalls that are opposite to each other along the first direction, and at least one air outlet on the sidewall of the isolation shell that is away from the shell body along the second direction. The first direction and the second direction are perpendicular, and both the air inlet and the air outlet are oriented toward the heat dissipation fins.

5. The circuit breaker as described in claim 2, characterized in that, The fan assembly further includes a fourth fan. The two sidewalls of the isolation housing, which are arranged opposite each other along the first direction, are respectively provided with the air inlet and the air outlet. The heat dissipation fins and the fourth fan are spaced apart along the first direction. The air inlet side of the fourth fan faces the air inlet, and the air outlet side of the fourth fan faces the air outlet, so that the airflow entering the accommodating space from the air inlet can exchange heat with the heat dissipation fins under the drive of the fourth fan and then leave the accommodating space from the air outlet.

6. The circuit breaker as described in claim 2, characterized in that, The circuit breaker also includes a first dustproof mesh and a second dustproof mesh, both of which are connected to the isolation housing. The first dustproof mesh is located at the air inlet, and the second dustproof mesh is located at the air outlet.

7. The circuit breaker as described in any one of claims 1 to 6, characterized in that, The circuit breaker also includes a deflector assembly, which includes a first deflector located on the air outlet side of the first fan. The first deflector is used to guide the airflow blown out by the first fan to the cold end face.

8. The circuit breaker as claimed in claim 7, characterized in that, The air guide plate assembly further includes a second air guide plate located on the air inlet side of the second fan. The second air guide plate is used to guide the airflow after heat exchange with the cold end face to flow to the air inlet side of the second fan.

9. The circuit breaker as described in any one of claims 1 to 6, characterized in that, The circuit breaker also includes heat-conducting fins, each heat-conducting fin comprising a base plate and heat-conducting plates connected to each other. There are multiple heat-conducting plates, and an airflow channel is formed between any two adjacent heat-conducting plates for airflow to pass through. The side of the base plate away from the heat-conducting plates is connected to the cold end face.

10. The circuit breaker as described in any one of claims 1 to 6, characterized in that, The heat dissipation space is located above the installation space.

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