Circuit breaker
By combining an insulating partition wall and a high thermal conductivity graphene plastic component in the circuit breaker, the problem of excessive temperature rise in the intermediate phase terminals is solved, achieving efficient heat dissipation of the circuit breaker in harsh environments, meeting temperature rise requirements, and improving product reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI LIANGXIN ELECTRICAL CO LTD
- Filing Date
- 2024-10-24
- Publication Date
- 2026-04-24
AI Technical Summary
In existing circuit breakers, the temperature rise of the intermediate phase terminals exceeds 70K, causing the products to fail temperature rise tests under standard conditions and harsh environments, and thus failing to meet the temperature rise requirements under harsh operating conditions such as high altitude, high frequency and enclosed environment.
An insulating partition wall is set between adjacent phase units of the circuit breaker, and a high thermal conductivity graphene plastic part is embedded in the insulating partition wall as a heat dissipation part to form a groove to increase the heat dissipation effect. A high temperature resistant insulating coating is coated on the surface of the heat dissipation part to increase the heat dissipation area for targeted heat dissipation.
This improved the heat dissipation efficiency of the circuit breaker, reduced the temperature rise of the phase unit, met the temperature rise requirements of the product under standard conditions and harsh environments, and enhanced the reliability and performance of the product.
Smart Images
Figure CN121922533A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a circuit breaker. Background Technology
[0002] Currently, during the operation of circuit breakers, the terminal temperature of the middle phase is significantly higher than that of the terminals on both sides. This is mainly because there are heat sources on both sides of the middle phase terminals, resulting in a high ambient temperature and poor heat dissipation, thus causing the middle phase temperature to be higher. The low-voltage circuit breaker standard 14048.2 requires that the terminal temperature rise not exceed 70K. However, some circuit breakers exhibit conditions where the temperature rise of the terminals on both sides is <70K, while the temperature rise of the middle phase terminals exceeds 70K, leading to failure in temperature rise tests. In more demanding operating scenarios, such as high altitude, high frequency, and enclosed environments, the requirements for temperature rise performance are even higher to ensure reliable operation. Clearly, current circuit breakers cannot meet the requirements under standard conditions and in such harsh environments. Summary of the Invention
[0003] The purpose of this application is to provide a circuit breaker that has high heat dissipation efficiency and can meet the temperature rise requirements of products, in order to address the shortcomings of the prior art.
[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:
[0005] In one aspect of this application, a circuit breaker is provided, including a housing and a plurality of phase units arranged side by side within the housing. The side-by-side direction of the plurality of phase units is perpendicular to the arrangement direction of the phase units. An insulating partition wall arranged along the arrangement direction is provided between adjacent phase units, and a heat dissipation element is provided in the insulating partition wall between at least two adjacent phase units.
[0006] Optionally, the insulating partition wall forms a groove, and the heat sink is disposed within the groove.
[0007] Optionally, the groove has an opening that extends through the insulating partition wall.
[0008] Optionally, the surface of the heat sink is coated with a high-temperature resistant insulating coating.
[0009] Optionally, the insulating partition wall and the heat sink are integrally formed.
[0010] Optionally, the heat sink is made of high thermal conductivity graphene plastic.
[0011] Optionally, along the arrangement direction of the phase unit, the heat sink extends from the phase unit to the outer surface of the housing, and the extended portion forms a heat dissipation end.
[0012] Optionally, a phase spacer is also provided, wherein the phase spacer is located on the outer side of the heat dissipation end along the arrangement direction of the phase unit.
[0013] Optionally, the heat sink is integrally formed with the phase spacer.
[0014] Optionally, among the multiple side-by-side phase units, the heat sink is respectively disposed between the two outermost phase units and the outer wall of the housing.
[0015] The beneficial effects of this application include:
[0016] This application provides a circuit breaker in which each phase unit is arranged laterally, and multiple phase units are arranged side by side vertically. At least adjacent phase units in the side-by-side direction are separated by insulating partitions arranged along the arrangement direction, and heat dissipation components are installed in the insulating partitions between at least two adjacent phase units. In this way, the heat dissipation components can effectively and specifically dissipate heat from the heat sources of adjacent phase units, solving the problem of high phase unit temperatures, thereby improving the heat dissipation efficiency of the phase units, reducing the temperature rise of the phase units, and meeting the temperature rise requirements of the product under standard conditions and harsh environments. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is one of the structural schematic diagrams of a circuit breaker provided in an embodiment of this application;
[0019] Figure 2 This is a second schematic diagram of the structure of a circuit breaker provided in an embodiment of this application;
[0020] Figure 3 This is the third schematic diagram of a circuit breaker provided in the embodiments of this application.
[0021] Icons: 10-House; 11-Phase unit; 12-Heat sink; 13-Heat sink end; 14-Phase spacer; F-Arrangement direction; D-Parallel direction. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.
[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] One aspect of the embodiments of this application refers to... Figure 1A circuit breaker is provided, including a housing 10 and a plurality of phase units 11 arranged side by side within the housing 10. The side-by-side direction D (i.e., vertical direction) of the plurality of phase units 11 is perpendicular to the arrangement direction F (i.e., horizontal direction) of the phase units 11. An insulating partition wall arranged along the arrangement direction F is provided between adjacent phase units 11, and a heat sink 12 is provided in the insulating partition wall between at least two adjacent phase units 11.
[0029] Furthermore, at least two adjacent phase units 11 each carry the rated current, and a heat sink 12 is provided between adjacent phase units 11 to dissipate heat from the adjacent phase units 11.
[0030] In other embodiments, two adjacent phase units 11, one phase unit 11 carries the rated current and the other phase unit does not carry the rated current, that is, carries a current smaller than the rated current. A heat sink 12 can also be provided between these two phase units 11 for heat dissipation.
[0031] In this application, each phase unit 11 is arranged in a horizontal direction, and multiple phase units 11 are arranged side by side in a vertical direction. At least two adjacent phase units 11 in the side-by-side direction D are provided with a heat sink 12. In this way, the heat sink 12 can effectively dissipate heat from the heat sources of these two adjacent phase units 11, solving the problem of excessive temperature of the phase unit 11, thereby improving the heat dissipation efficiency of the phase unit 11, reducing the temperature rise of the phase unit 11, and meeting the temperature rise requirements of the product under standard conditions and harsh environments.
[0032] For example, a three-phase circuit breaker includes an upper phase unit 11, a middle phase unit 11, and a lower phase unit 11. The three phase units 11 are arranged laterally and side-by-side vertically, each carrying a rated current. The upper phase unit 11 and the middle phase unit 11, in the side-by-side direction D, are adjacent and carry rated current. A heat sink 12 is provided between the upper phase unit 11 and the middle phase unit 11. In this way, the heat sink 12 can effectively dissipate heat from the heat sources of the upper phase unit 11 and the middle phase unit 11, solving the problem of high ambient temperature and poor heat dissipation caused by heat sources on both the upper and lower sides of the middle phase unit 11, thus improving the heat dissipation efficiency of the middle phase unit 11, reducing its temperature rise, and meeting the temperature rise requirements of the product under standard conditions and harsh environments. Preferably, a heat sink 12 is also provided between the lower phase unit 11 and the middle phase unit 11 for even better results.
[0033] For example, in a four-phase circuit breaker, four phase units 11 are arranged laterally and side-by-side vertically, from top to bottom as upper phase unit 11, middle phase unit 11, lower phase unit 11, and neutral phase unit 11. The upper, middle, and lower phase units 11 carry the rated current, while the neutral phase unit 11 does not carry the rated current, i.e., it carries a current smaller than the rated current. A heat sink 12 is installed between the upper and middle phase units 11. In this way, the heat sink 12 can effectively dissipate heat from the heat sources of the upper and middle phase units 11, solving the problem of high ambient temperature and poor heat dissipation caused by heat sources on both the upper and lower sides of the middle phase unit 11, thus improving the heat dissipation efficiency of the middle phase unit 11, reducing its temperature rise, and meeting the temperature rise requirements of the product under standard conditions and harsh environments. Preferably, a heat sink 12 is also provided between the lower phase unit 11 and the intermediate phase unit 11, which provides better performance. Furthermore, a heat sink 12 is also provided between the lower phase unit 11 and the neutral phase unit 11.
[0034] An insulating partition wall is provided between adjacent phase units 11 along the arrangement direction F (lateral direction). The insulating partition wall is an insulating plastic part and forms a groove. The heat dissipation part 12 is disposed in the groove.
[0035] Multiple phase units 11 arranged in a parallel direction D are separated by insulating partitions. A heat sink 12 is disposed within a groove in the insulating partition to dissipate heat from the phase unit 11 in the middle position. For example, the heat sink 12 is presented as a heat sink plate.
[0036] The surface of the heat sink 12 is coated with a high-temperature resistant insulating coating, preferably resistant to temperatures above 1000°C, which can effectively prevent the heat sink 12 material from undergoing insulation failure and breakdown under high temperature and / or high voltage.
[0037] In some embodiments, the insulating coating capable of withstanding high temperatures above 1000°C may be an alumina coating.
[0038] The heat sink 12 is made of high thermal conductivity graphene plastic to meet the high thermal conductivity requirements.
[0039] Furthermore, the insulating partition wall forms a groove, and the heat sink 12 is disposed in the groove. The groove has an opening that penetrates the insulating partition wall, and the opening at least partially overlaps with the projection of the heat sink 12 in the parallel direction D. The heat sink 12 is exposed through the opening, so that the heat sink 12 can directly contact the air in the cavity of the phase unit 11 and directly dissipate heat from the phase unit 11, thereby increasing the heat dissipation effect of the heat sink 12 on the phase unit 11.
[0040] Furthermore, the insulating partition wall and the heat sink 12 are integrated, for example, the insulating partition wall is composed of the heat sink 12, or the insulating partition wall and the heat sink 12 are made of different materials but are integrated, thereby increasing the heat dissipation effect of the heat sink 12.
[0041] The length of the aforementioned heat sink 12 in the lateral direction is basically the same as that of the phase unit 11. Based on this, such as Figure 2 As shown, along the arrangement direction F of the phase unit 11, the heat sink 12 extends from the phase unit 11 to the outer surface of the housing 10, and the extended portion forms the heat dissipation end 13.
[0042] The length of the heat sink 12 in the lateral direction exceeds the length of the phase unit 11 and extends outward toward the housing 10 until it is flush with the outer surface of the housing 10, with the extended portion forming a heat dissipation end 13. This increases the heat dissipation area of the heat sink 12, allowing it to dissipate heat not only in the area of the phase unit 11 but also in the area surrounding the phase unit 11, thereby improving the heat dissipation speed.
[0043] Preferably, the length of the heat dissipation end 13 in the vertical direction is greater than the length of the heat dissipation component 12 in the vertical direction, which can further increase the heat dissipation area of the heat dissipation component 12 for the area surrounding the phase unit 11.
[0044] Preferably, the length of the heat dissipation end 13 in the vertical direction is greater than the length of the heat dissipation component 12 in the vertical direction, and the heat dissipation end 13 is provided with a slot, which not only further increases the heat dissipation area, but can also be used to connect the phase spacer 14.
[0045] Reference Figure 3 It is also provided with phase spacer 14, which are located on the outside of heat dissipation end 13 along the arrangement direction F of phase unit 11.
[0046] In order to improve heat dissipation efficiency, the heat sink 12 can be integrated with the phase spacer 14, and the heat sink 12 extends to the outside of the housing 10, which further increases the heat dissipation area of the heat sink 12.
[0047] As mentioned above, a heat sink 12 can be provided between at least two adjacent phase units 11; in other embodiments, heat sinks 12 are provided between the two outermost phase units 11 and the outer wall of the housing 10 in a plurality of side-by-side phase units 11.
[0048] In other words, in addition to heat sinks 12 being provided between the side-by-side phase units 11, heat sinks 12 can also be provided between the outermost two phase units 11 and the outer wall of the housing 10. This can further reduce the overall terminal temperature of the product and improve the overall performance and reliability of the product, based on reducing the temperature rise of the middle phase unit 11.
[0049] The following are examples of the arrangement of heat sink 12 in several circuit breakers:
[0050] In Example 1, as Figure 1 The heat dissipation structure consists of a groove in the middle of the insulating partition walls on both sides of the intermediate phase unit 11 inside the circuit breaker housing 10. A high thermal conductivity graphene plastic component is placed in the groove as a heat dissipation component 12. The surface of the heat dissipation component 12 is coated with an insulating coating, which is an aluminum oxide coating and can withstand temperatures above 1000°C, thereby improving the heat dissipation effect of the intermediate phase unit 11 and reducing the temperature rise of the intermediate phase unit 11 in the product.
[0051] In Example 2, as Figure 2 The heat dissipation structure consists of a groove in the middle of the insulating partition wall on both sides of the intermediate phase unit 11 inside the circuit breaker housing 10. A high thermal conductivity graphene plastic component is placed in the groove as a heat dissipation component 12. This heat dissipation component 12 can be part of the insulating partition wall, extending outward toward the outside of the housing 10 until it is flush with the outer surface of the housing 10. The extended part forms a heat dissipation end 13, which transfers the heat of the conductive circuit to the outside of the housing 10, further reducing the temperature rise of the product terminals. At the same time, the surface of the heat dissipation component 12 is coated with an insulating coating, which is an aluminum oxide coating and can withstand high temperatures of over 1000°C.
[0052] In Example 3, as Figure 3 The heat dissipation structure consists of grooves in the middle of the insulating partition walls on both sides of the intermediate phase unit 11 inside the circuit breaker housing 10. High thermal conductivity graphene plastic components are placed in these grooves as heat dissipation components 12. These heat dissipation components 12 can extend outside the housing 10 as part of the insulating partition wall and further extend to be integrated with the phase partition plate 14, greatly increasing the heat dissipation area. Simultaneously, the surface of the heat dissipation component 12 is coated with an insulating coating, which is an alumina coating and can withstand temperatures above 1000°C.
[0053] In Example 4, Figure 1 , Figure 2 , Figure 3 Based on this, grooves are provided in the middle of the insulating partition walls on both sides of the intermediate phase unit 11 inside the circuit breaker housing 10. High thermal conductivity graphene plastic parts are installed in the grooves as heat sinks 12. Heat sinks 12 are also provided between the upper and lower two outermost phase units 11 and the outer wall of the housing 10. In addition to reducing the temperature rise of the intermediate phase unit 11, the overall terminal temperature of the product is further reduced by providing heat sinks 12 between the outer wall of the circuit breaker and the outermost phase unit 11. Simultaneously, the surface of the heat sink 12 is coated with an insulating coating, which is an alumina coating and can withstand temperatures above 1000°C.
[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A circuit breaker, characterized in that, The device includes a housing (10) and a plurality of phase units (11) arranged side by side within the housing (10). The side-by-side direction (D) of the plurality of phase units (11) is perpendicular to the arrangement direction (F) of the phase units (11). An insulating partition wall is provided between adjacent phase units (11) arranged along the arrangement direction (F). A heat sink (12) is provided in the insulating partition wall between at least two adjacent phase units (11).
2. The circuit breaker according to claim 1, characterized in that, The insulating partition wall forms a groove, and the heat sink (12) is disposed in the groove.
3. The circuit breaker according to claim 2, characterized in that, The groove has an opening that penetrates the insulating partition wall, and the opening at least partially coincides with the projection of the heat sink (12) in the side-by-side direction (D).
4. The circuit breaker according to claim 1, characterized in that, The surface of the heat sink (12) is coated with a high-temperature resistant insulating coating.
5. The circuit breaker according to claim 1, characterized in that, The insulating partition wall and the heat sink (12) are integrally formed.
6. The circuit breaker according to claim 1, characterized in that, The heat sink (12) is made of high thermal conductivity graphene plastic.
7. The circuit breaker according to any one of claims 1 to 6, characterized in that, Along the arrangement direction (F) of the phase unit (11), the heat sink (12) extends out of the phase unit (11) to the outer surface of the housing (10), and the extended portion forms a heat dissipation end (13).
8. The circuit breaker according to claim 7, characterized in that, A phase spacer (14) is also provided, which is located outside the heat dissipation end (13) along the arrangement direction (F) of the phase unit (11).
9. The circuit breaker according to claim 8, characterized in that, The heat sink (12) is integrally formed with the phase spacer (14).
10. The circuit breaker according to any one of claims 1 to 6, 8 to 9, characterized in that, Among the multiple side-by-side phase units (11), the heat sinks (12) are respectively disposed between the two outermost phase units (11) and the outer wall of the housing (10).