Circuit breaker

Abstract

The utility model belongs to the technical field of power equipment, and discloses a circuit breaker. The circuit breaker comprises a base and a cover body, the cover body and the base are mutually buckled to form a mounting cavity, a plurality of heat dissipation holes are formed in the top of the cover body, a connecting plate is arranged at the bottom of the cover body, one end of the connecting plate is attached to the end face of the base, a plurality of flow guide structures are arranged on the connecting plate, and the heat dissipation holes and the flow guide structures are all communicated with the mounting cavity. And the mounting cavities can be communicated with the external space through the heat dissipation holes and the flow guide structures. According to the utility model, under the condition that the overall volume of the circuit breaker is not influenced, gas convection is formed, the heat dissipation efficiency is improved, and the temperature rise of the circuit breaker is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to a circuit breaker. Background Art

[0002] The circuit breaker is usually installed vertically. An arc extinguishing chamber is usually provided near the top inside the circuit breaker, and heat dissipation holes are usually provided on the outer shell of the circuit breaker near the arc extinguishing chamber to facilitate heat dissipation. A plurality of actuating components connected in transmission are usually provided in the space below the arc extinguishing chamber, including thermal elements (such as bimetallic parts) or magnetic trip actuating components. The bottom of the circuit breaker is usually sealed with a sealing plate.

[0003] Please refer to the attached Figure 1 , the prior art discloses a circuit breaker, which includes a first cover body 100 and a first base 200 that is buckled with the first cover body 100. The bottom of the circuit breaker is sealed with a sealing plate 300.

[0004] Since the internal electrical connection components of the current circuit breaker continuously generate heat during operation, the overall circuit breaker uses the top heat dissipation method, with low heat dissipation efficiency and no convection formed, resulting in a relatively high temperature rise. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a circuit breaker, which can form convection, improve the heat dissipation efficiency and reduce the temperature rise of the circuit breaker without affecting the overall volume of the circuit breaker.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A circuit breaker, comprising:

[0008] A base;

[0009] A cover body, the cover body is buckled with the base to form an installation chamber. A plurality of heat dissipation holes are provided at the top of the cover body, a connection plate is provided at the bottom of the cover body, one end of the connection plate is attached to the end face of the base, a plurality of flow guiding structures are provided on the connection plate, both the heat dissipation holes and the flow guiding structures are communicated with the installation chamber, and the installation chamber can be communicated with the external space through the heat dissipation holes and the flow guiding structures.

[0010] As an optional solution of the circuit breaker, a plurality of the flow guiding structures are arranged at intervals on the connection plate, and the flow guiding structures are strip-shaped flow guiding grooves.

[0011] As an optional solution of the circuit breaker, a plurality of the flow guiding structures are arranged at intervals on the connection plate, and the flow guiding structures are strip-shaped flow guiding holes.

[0012] As an optional solution of the circuit breaker, the flow guiding structure is a circular flow guiding hole.

[0013] As an alternative solution for a circuit breaker, multiple said diversion holes are arranged in an array.

[0014] As an alternative solution for a circuit breaker, an arc extinguishing chamber is provided inside the installation chamber, and the heat dissipation holes are arranged opposite to the arc extinguishing chamber.

[0015] As an alternative solution for a circuit breaker, the diversion structure is arranged corresponding to the wiring terminal of the circuit breaker.

[0016] As an alternative solution for a circuit breaker, the extending direction of the diversion structure is arranged at an angle with the end face of the wiring terminal.

[0017] As an alternative solution for a circuit breaker, the extending direction of the diversion structure is arranged at a right angle with the end face of the wiring terminal.

[0018] As an alternative solution for a circuit breaker, a baffle is provided at the end of the base, one end of the baffle extends towards the connection plate and fits against one end of the connection plate, and the baffle covers the bus bar inside the circuit breaker.

[0019] Beneficial effects:

[0020] In the present utility model, by providing a plurality of heat dissipation holes at the top of the cover body, a connection plate at the bottom, and a plurality of diversion structures arranged on the connection plate, it is ensured that the installation chamber can communicate with the external space through the heat dissipation holes and the diversion structures. Since the conductive components inside the installation chamber generate heat, it will cause a relatively high temperature rise in the installation chamber, and the temperature inside the installation chamber is higher than that of the external space. The air with a relatively low temperature outside the circuit breaker will enter the installation chamber through the diversion structure, form a convection with the hot air inside the installation chamber, and gradually flow upward through the mechanical structure components such as the operating mechanism and the actuating mechanism provided below the arc extinguishing chamber to the arc extinguishing chamber, and finally will be discharged outside the circuit breaker through the heat dissipation holes at the top of the cover body, forming a complete gas cooling channel. This embodiment can form a gas convection without changing the overall volume of the circuit breaker, which is beneficial to accelerating heat dissipation, improving the heat dissipation efficiency, and reducing the temperature rise of the circuit breaker. Description of the drawings

[0021] Figure 1 is a schematic structural diagram of an existing circuit breaker;

[0022] Figure 2 is a schematic structural diagram of the circuit breaker provided by the embodiment of the present utility model;

[0023] Figure 3 is a schematic internal structural diagram of the circuit breaker provided by the embodiment of the present utility model;

[0024] Figure 4It is a schematic structural diagram of the cover body provided by an embodiment of the present utility model;

[0025] Figure 5 is Figure 4 a partial enlarged view at A.

[0026] In the figure:

[0027] 100, the first cover body; 200, the first base; 300, the sealing plate;

[0028] 1, the base; 11, the baffle; 2, the cover body; 21, the heat dissipation holes; 22, the connecting plate; 221, the flow guiding structure; 3, the installation chamber; 31, the arc extinguishing chamber; 4, the terminal; 41, the bus bar. Detailed implementation manners

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings. They are only for the convenience of description and simplifying operations, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] Please refer to the attached Figure 2 - attached Figure 5 , this embodiment relates to a circuit breaker, which includes a base 1 and a cover 2. The cover 2 and the base 1 are buckled with each other to form an installation chamber 3. A plurality of heat dissipation holes 21 are provided at the top of the cover 2, and a connection plate 22 is provided at the bottom of the cover 2. One end of the connection plate 22 is attached to the end face of the base 1. A plurality of flow guiding structures 221 are provided on the connection plate 22. Both the heat dissipation holes 21 and the flow guiding structures 221 are communicated with the installation chamber 3, and the installation chamber 3 can be communicated with the external space through the heat dissipation holes 21 and the flow guiding structures 221.

[0034] In this embodiment, both the base 1 and the cover 2 are plastic shells. The base 1 and the cover 2 are buckled with each other to form an installation chamber 3 inside. The operation mechanism, action mechanism, conductive structure, arc extinguishing structure, etc. of the circuit breaker are provided in the installation chamber 3. Among them, an arc extinguishing chamber 31 is provided at a position near the top of the installation chamber 3. A plurality of arc extinguishing grids are provided at intervals inside the arc extinguishing chamber 31. Mechanical structure components such as an operation mechanism and an action mechanism are provided below the arc extinguishing chamber 31.

[0035] Please further refer to the attached Figure 3 , by providing a plurality of heat dissipation holes 21 at the top of the cover 2, a connection plate 22 at the bottom, and a plurality of flow guiding structures 221 on the connection plate 22, it is ensured that the installation chamber 3 can be communicated with the external space through the heat dissipation holes 21 and the flow guiding structures 221. Since the conductive components inside the installation chamber 3 generate heat, it will cause the temperature rise of the installation chamber 3 to be relatively high. The temperature inside the installation chamber 3 is higher than that of the external space. The air with a relatively low temperature outside the bottom of the circuit breaker will enter the installation chamber 3 through the flow guiding structures 221, form convection with the hot air inside the installation chamber 3, and gradually pass through the mechanical structure components such as the operation mechanism and the action mechanism below the arc extinguishing chamber 31, continue to flow upward to the arc extinguishing chamber 31, and finally be discharged outside the circuit breaker through the heat dissipation holes 21 at the top of the cover 2, forming a complete gas cooling channel. This embodiment can form gas convection without changing the overall volume of the circuit breaker, which is beneficial to accelerating heat dissipation, improving heat dissipation efficiency, and reducing the temperature rise of the circuit breaker.

[0036] Optionally, a plurality of flow guiding structures 221 are provided at intervals on the connection plate 22, and the flow guiding structures 221 are strip-shaped flow guiding grooves.

[0037] In this embodiment, the connection plate 22 has a plate-like structure. As an implementation form of this embodiment, the flow guiding structure 221 can be a flow guiding groove extending along the length direction of the connection plate 22, and the flow guiding groove is rectangular.

[0038] Optionally, a plurality of flow guiding structures 221 are provided at intervals on the connection plate 22, and the flow guiding structures 221 are strip-shaped flow guiding holes.

[0039] As an implementation form of this embodiment, the flow guiding structure 221 is a strip-shaped flow guiding hole, specifically a rectangular flow guiding hole.

[0040] Optionally, the flow guiding structure 221 is a circular flow guiding hole. The plurality of flow guiding holes are arranged in an array.

[0041] As an implementation form of this embodiment, the flow guiding structure 221 is a circular flow guiding hole and is arranged in an array distribution.

[0042] Those skilled in the art can understand that for the specific style, size, and distribution state of the flow guiding structure 221, a comprehensive selection can be made according to the processing difficulty and the flow guiding effect, and this embodiment does not make specific limitations.

[0043] Optionally, an arc extinguishing chamber 31 is provided inside the installation chamber 3, and the heat dissipation holes 21 are arranged opposite to the arc extinguishing chamber 31.

[0044] In this embodiment, since the arc extinguishing chamber 31 participates in the arc extinguishing effect inside, heat will be concentrated inside the circuit breaker. Arranging the heat dissipation holes 21 opposite to the arc extinguishing chamber 31 is beneficial for the heat to directly flow from the heat dissipation holes 21 to the external space, improving the heat dissipation efficiency and reducing heat accumulation.

[0045] Optionally, the flow guiding structure 221 is arranged corresponding to the wiring terminal 4 of the circuit breaker.

[0046] In this embodiment, a connection plate 22 is provided corresponding to each phase wiring terminal 4 of the circuit breaker, that is, a flow guiding structure 221 is provided corresponding to each phase wiring terminal 4, so as to ensure that the heat generated by each phase wiring terminal 4 has the same influence on the external space, and avoid uneven heat between adjacent phases, thereby affecting gas convection.

[0047] Further, the extending direction of the flow guiding structure 221 is arranged at an angle with the end face of the wiring terminal 4.

[0048] In this embodiment, the wiring terminal 4 is located in the external space, and the heat of the wiring terminal 4 usually exchanges heat with the external space. By arranging the extending direction of the flow guiding structure 221 at an angle with the end face of the wiring terminal 4, it can be avoided that the heat generated by the wiring terminal 4 directly enters the circuit breaker through the flow guiding structure 221, and reduce the influence of the heat generated by the wiring terminal 4 on the internal temperature rise of the circuit breaker.

[0049] Preferably, the extending direction of the diversion structure 221 is set at a right angle to the end face of the terminal 4.

[0050] In this embodiment, the extending direction of the diversion structure 221 is at a right angle to the end face of the terminal 4, which maximally blocks the heat generated by the terminal 4 from entering the circuit breaker through the diversion structure 221.

[0051] Optionally, a baffle 11 is provided at the end of the base 1. One end of the baffle 11 extends towards the connection plate 22 and fits against one end of the connection plate 22. The baffle 11 covers the bus bar 41 inside the circuit breaker.

[0052] In this embodiment, since the connection plate 22 is an open-hole or slotted structure, the connection plate 22 cannot directly extend to the bus bar 41 and cover the bus bar 41. In this embodiment, the baffle 11 is used to cover the bus bar 41 inside the circuit breaker, and the baffle 11 can prevent people from touching the live bus bar 41, thereby improving safety.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker, characterized in that include: Base (1); A cover body (2), wherein the cover body (2) and the base (1) are interlocked to form an installation chamber (3), a plurality of heat dissipation holes (21) are provided on the top of the cover body (2), a connecting plate (22) is provided on the bottom of the cover body (2), one end of the connecting plate (22) is attached to the end surface of the base (1), a plurality of flow guide structures (221) are provided on the connecting plate (22), the heat dissipation holes (21) and the flow guide structures (221) are both connected to the installation chamber (3), and the installation chamber (3) can be connected to the external space through the heat dissipation holes (21) and the flow guide structures (221).

2. The circuit breaker according to claim 1, characterized in that: The connecting plate (22) is provided with a plurality of the guide structures (221) at intervals, and the guide structures (221) are long strip-shaped guide grooves.

3. The circuit breaker according to claim 1, characterized in that: The connecting plate (22) is provided with a plurality of the flow-guiding structures (221) at intervals, and the flow-guiding structures (221) are long strip-shaped flow-guiding holes.

4. The circuit breaker according to claim 1, characterized in that: The flow guiding structure (221) is a circular flow guiding hole.

5. The circuit breaker according to claim 4, characterized in that: The plurality of guide holes are arranged in an array.

6. The circuit breaker according to claim 1, characterized in that: An arc extinguishing chamber (31) is provided inside the installation chamber (3), and the heat dissipation hole (21) is arranged relative to the arc extinguishing chamber (31).

7. The circuit breaker according to claim 1, characterized in that: The flow guiding structure (221) is arranged corresponding to the connection terminal (4) of the circuit breaker.

8. The circuit breaker according to claim 7, characterized in that: The extension direction of the flow-guiding structure (221) is arranged at an angle to the end surface of the connection terminal (4).

9. The circuit breaker according to claim 8, characterized in that The extension direction of the flow-guiding structure (221) is arranged at a right angle to the end face of the connecting terminal (4).

10. The circuit breaker according to claim 9, characterized in that A baffle (11) is provided at the end of the base (1), one end of the baffle (11) extends toward the connecting plate (22) and fits against one end of the connecting plate (22), and the baffle (11) is covered on the bus bar (41) inside the circuit breaker.

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