Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker

Abstract

The utility model relates to a connecting row for plastic shell circuit breaker heat dissipation, its characterized in that: it includes inner connecting part (1) and outer heat dissipation part (2), inner connecting part (1) is placed in the inner chamber (3a) of circuit breaker's shell (3) and connects adjacent pole moving contact (5) and / or adjacent pole static contact (4), and outer heat dissipation part (2) is connected with inner connecting part (1) and is placed in the inner chamber (3a) outside of circuit breaker's shell (3). This heat dissipation structure connects adjacent pole moving contact and / or adjacent pole static contact in circuit breaker's inner chamber through inner connecting part, and the heat is exported to the outer heat dissipation part outside the inner chamber of shell through inner connecting part, not only greatly effectively reduces the temperature rise when the existing short connecting row is placed in the inner chamber of circuit breaker's shell, but also greatly effectively reduces even does not occupy the space that the existing outer short connecting row's heat dissipation device is placed outside the range of circuit breaker's shell.

Description

Technical Field

[0001] This invention belongs to the technical field of molded case circuit breakers, specifically relating to a connection bar for heat dissipation of molded case circuit breakers and the heat dissipation structure of the molded case circuit breaker, which can effectively reduce the temperature rise of the circuit breaker. Background Technology

[0002] Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application. Low-voltage circuit breakers, also known as automatic switches or "air switches," are electrical appliances that combine manual switching functionality with automatic protection against undervoltage, overload, and short-circuit faults. They can be used to distribute electrical energy, infrequently start asynchronous motors, and protect power lines and motors. When serious overloads, short circuits, or undervoltage faults occur, they automatically disconnect the circuit. Furthermore, they generally do not require replacement of components after interrupting the fault current, and have gained widespread application.

[0003] To improve DC breaking capacity, existing DC circuit breakers employ multi-break connection methods, which involve connecting two or more poles of a multi-pole circuit breaker in series or in parallel. This is typically done externally, with the series or parallel connections made at the terminals of the multi-pole circuit breaker. However, the wiring often falls short of the specified length, leading to excessively high surface temperatures on the connecting busbars. Excessive temperatures not only cause circuit breaker malfunctions but also pose electrical safety hazards, such as premature aging of insulation components and accelerated oxidation of contacts. Therefore, ordinary external connecting busbars are no longer sufficient.

[0004] The conventional approach in this field is to add a heat sink to the external connection bar or to change it to an internal connection.

[0005] Chinese patent CN208157334U discloses a molded case circuit breaker with heat dissipation function, which includes a circuit breaker body and a heat dissipation device. The heat dissipation device is fixedly connected to the terminals outside the circuit breaker housing by bolts, and includes a heat dissipation radiator and at least one heat dissipation fin, with the heat dissipation fins arranged in a comb shape on the heat dissipation radiator. This technical solution only requires simple modifications to the structure of the cooling components and the connection relationship of the circuit breaker to achieve the purpose of reducing the temperature of the circuit breaker. The entire product structure is simple and the performance is reliable. However, the heat dissipation structure of this circuit breaker is only suitable for the external shorting bar structure on the terminals outside the circuit breaker housing. Therefore, the heat dissipation fin is entirely outside the housing area, and the heat dissipation fin extends too far beyond the housing area, increasing the space occupied by the product.

[0006] Multi-break DC circuit breakers are increasingly adopting a design where adjacent moving contacts or adjacent stationary contacts are connected in series by a conductor inside the casing. For example, Chinese patent CN102456515B discloses a multi-break circuit breaker using a pre-connected method. Inside the insulating casing, every two adjacent sets of moving contacts are connected by a conductor, forming a single pole with at least two breaks connected in series, of the same polarity or phase. Multiple breaks are connected in series inside the circuit breaker casing, eliminating the need for users to manually wire the connections at the terminals. Long-delay characteristics are also set using this pre-connected method, and the operating characteristics remain unaffected during user operation. In this circuit breaker, the shorting busbar is located inside the casing, and since temperature rise performance requirements are generally not a concern, no heat dissipation device is needed. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing molded case circuit breakers, where the shorting bar generates significant heat when placed inside the circuit breaker housing, leading to high internal temperature rise, accelerated insulation aging, and accelerated oxidation of contact points. This invention provides a connecting bar for heat dissipation in molded case circuit breakers and a heat dissipation structure for the circuit breaker itself. By connecting the connecting part to the heat-generating part inside the circuit breaker cavity, heat is dissipated through the connecting part to the housing. This not only significantly reduces the temperature rise when the existing shorting bar is placed inside the circuit breaker housing, but also does not occupy space outside the circuit breaker housing.

[0008] Technical solution

[0009] To achieve the above-mentioned technical objectives, the present invention provides a connection bar for heat dissipation of a molded case circuit breaker, characterized in that: it includes an inner connection part and an outer heat dissipation part, the inner connection part is placed in the inner cavity of the circuit breaker housing and connects adjacent moving contacts and / or adjacent stationary contacts, and the outer heat dissipation part is connected to the inner connection part and is placed outside the inner cavity of the circuit breaker housing.

[0010] Furthermore, the external heat dissipation part is located outside the inner cavity of the circuit breaker housing and is simultaneously within the housing area of ​​the circuit breaker.

[0011] Furthermore, the inner connecting part is a rigid conductor.

[0012] Furthermore, the inner connecting part and the outer heat dissipation part are integrated or combined.

[0013] Furthermore, the heat dissipation surface of the external heat dissipation part is provided with heat dissipation fins, heat dissipation grooves, or heat dissipation holes in all or part of it.

[0014] The present invention also provides a heat dissipation structure for a molded case circuit breaker, which includes a housing and a contact system. The contact system is located in the inner cavity of the housing. The structure is characterized by further including the aforementioned connecting bar, wherein at least one set of moving contacts of adjacent poles in the contact system are connected through an internal connecting part and / or at least one set of stationary contacts of adjacent poles in the contact system are connected through an internal connecting part, so that the two poles are connected to form a single pole of the same polarity or phase.

[0015] Furthermore, the base and the cover enclose the inner cavity of the circuit breaker housing.

[0016] Furthermore, in the contact system, at least one set of moving contacts of adjacent poles are connected in series through an internal connection part, or at least one set of stationary contacts of adjacent poles are connected in series through an internal connection part, so that the two poles are connected in series to form a pole of the same polarity or the same phase.

[0017] Furthermore, in the contact system, at least one set of moving contacts of adjacent poles are connected in series through an internal connection part, and at least one set of stationary contacts of adjacent poles corresponding to the moving contacts of the at least one set of adjacent poles are connected in series through an internal connection part. The moving contacts of the series-connected adjacent poles and the corresponding stationary contacts of the series-connected adjacent poles are connected in parallel, so that the two poles are connected in parallel to form a pole of the same polarity or the same phase.

[0018] Furthermore, when the two poles are connected in parallel to form a pole of the same polarity or phase, a portion of the outer heat dissipation portion of the inner connection part is used for heat dissipation, and the other portion is used for wiring.

[0019] Beneficial effects

[0020] This invention provides a connecting busbar for heat dissipation in molded case circuit breakers and a heat dissipation structure for the molded case circuit breaker. It changes the conventional thinking in the art and addresses the technical defect of high temperature rise inside the casing when the shorting busbar is placed inside the casing. It breaks through the conventional thinking that when the moving contacts or stationary contacts of adjacent poles are connected in series by conductors inside the casing, there is no need to dissipate the heat inside the circuit breaker casing. By connecting the connecting part to the heat-generating part inside the circuit breaker cavity, the heat inside the cavity is discharged from the casing through the connecting part. This not only greatly and effectively reduces the temperature rise when the shorting busbar is placed inside the circuit breaker casing, but also does not occupy the space outside the circuit breaker casing. Attached Figure Description

[0021] Appendix Figure 1 This is a three-dimensional schematic diagram of the molded case circuit breaker in Embodiment 1 of the present invention.

[0022] Appendix Figure 2a This is a schematic diagram of the connecting strip installation in Embodiment 1 of the present invention. Figure 1 .

[0023] Appendix Figure 2bThis is a schematic diagram of the connection bar installation in Embodiment 1 of the present invention.

[0024] Appendix Figure 2c This is a wiring connection diagram of Embodiment 1 of the present invention.

[0025] Appendix Figure 3 This is a schematic diagram of the connecting row in Embodiment 1 of the present invention.

[0026] Appendix Figure 4 This is a schematic diagram of the series connection of stationary contacts in Embodiment 1 of the present invention.

[0027] Appendix Figure 5 This is a schematic diagram of the moving contacts connected in series in Embodiment 2 of the present invention.

[0028] Appendix Figure 6 This is a schematic diagram of the stationary contacts connected in series when adjacent poles are connected in parallel in Embodiment 3 of the present invention.

[0029] Appendix Figure 7 This is a schematic diagram of the moving contacts connected in series when adjacent poles are connected in parallel in Embodiment 3 of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "inner," "outer," "front," "rear," "left," "right," "usual side," and "spare side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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 invention based on the specific circumstances.

[0033] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0034] Example 1

[0035] In existing molded case circuit breakers, when the shorting busbar is placed inside the casing (specifically, within the inner cavity 3a of the circuit breaker casing 3 formed by the base 6 and the cover 7), it is generally considered in the art that the temperature rise inside the casing will not affect the performance of the circuit breaker. Therefore, when the shorting busbar is placed inside the casing, a heat dissipation device is usually not installed. When the shorting busbar is placed outside the casing (i.e., outside the inner cavity 3a, including the portion outside the circuit breaker inner cavity 3a but within the circuit breaker casing area and the portion outside the circuit breaker casing area. In this embodiment, the outer casing area where the wiring terminals are located refers to the portion outside the circuit breaker inner cavity 3a but within the circuit breaker casing area), even considering the high temperature rise at the stationary contact and / or moving contact and wiring terminals, which easily accelerates insulation aging, heat dissipation devices are only installed outside the circuit breaker casing area. However, in reality, installing heat dissipation devices outside the circuit breaker casing area would greatly increase the space occupied by the circuit breaker. To solve the above technical problems, as shown in the appendix... Figure 1 and 2a As shown in Figures 2b and 2c, this embodiment provides a heat dissipation structure for a molded case circuit breaker. It includes a housing 3 and a contact system 8. A base 6 and a cover 7 enclose the inner cavity 3a of the housing 3. The contact system 8 is located within the inner cavity 3a of the housing 3. The heat dissipation structure also includes connecting bars, as shown in the attached figure. Figure 3 As shown, the connecting bar includes an inner connecting part 1 and an outer heat dissipation part 2. The inner connecting part 1 is placed in the inner cavity 3a of the circuit breaker housing 3 and connects to adjacent stationary contacts 4. The outer heat dissipation part 2 is connected to the inner connecting part 1 and is located outside the inner cavity 3a of the circuit breaker housing 3. In this embodiment, the outer heat dissipation part 2 is located outside the inner cavity 3a of the circuit breaker housing 3 and is simultaneously within the range of the circuit breaker housing 3. The inner connecting part 1 is preferably a rigid conductor. The inner connecting part 1 and the heat dissipation part 2 are integral or combined.

[0036] In the contact system 8, at least one set of stationary contacts 4 of adjacent poles are connected by an internal connecting part 1, so that the two poles are connected to form a single pole of the same polarity or phase. Specifically, in this embodiment, as shown in the attached figure... Figure 4 As shown, in the contact system, at least one set of stationary contacts 4 of adjacent poles are connected in series through the inner connecting part 1, so that the two poles are connected in series to form a single pole of the same polarity or phase. Preferably, all or part of the heat dissipation surface of the outer heat dissipation part 2 is provided with heat sinks 9, heat dissipation grooves, or heat dissipation holes. In this embodiment, adjacent poles are connected in series to form a single pole in the inner cavity 3a. The outer heat dissipation part 2 does not need to be used as a terminal for connecting to external wires, so the outer heat dissipation part 2 in this embodiment is provided with heat sinks 9.

[0037] Meanwhile, the external heat dissipation part 2 can also extend beyond the housing range. Since part of the external heat dissipation part 2 is within the housing range of the circuit breaker 3, it will inevitably occupy less space than when the heat dissipation part is added to the external connection bar in the prior art, where the entire heat dissipation part is outside the housing range.

[0038] Example 2

[0039] In the contact system 8, at least one set of moving contacts 5 of adjacent poles are connected by an inner connecting part 1, so that the two poles are connected to form a single pole of the same polarity or phase. Specifically, in this embodiment, as shown in the attached figure... Figure 5 As shown, in the contact system 8, at least one set of moving contacts 5 of adjacent poles are connected in series through an internal connecting part 1, so that the two poles are connected in series to form a single pole of the same polarity or phase. The internal connecting part 1 is placed in the inner cavity 3a of the circuit breaker housing 3 to connect the moving contacts 5 of adjacent poles. Preferably, all or part of the heat dissipation surface of the external heat dissipation part 2 is provided with heat sinks 9, heat dissipation grooves, or heat dissipation holes. In this embodiment, adjacent poles are connected in series to form a single pole in the inner cavity 3a. The external heat dissipation part 2 does not need to be used as a terminal for wiring with external wires, so the external heat dissipation part 2 in this embodiment is provided with heat sinks 9. Other structures are the same as in embodiment 1, and will not be described in further detail here.

[0040] Example 3

[0041] In this embodiment, as shown in the appendix Figure 6 and attached Figure 7 As shown, in the contact system, at least one set of moving contacts 5 of adjacent poles are connected in series through an inner connecting part 1, and the moving contacts 5 of the at least one set of adjacent poles in the contact system correspond as shown in the attached figure. Figure 6 At least one set of stationary contacts 4 of adjacent poles are connected in series via an internal connecting part 1. The series-connected set of moving contacts 5 of adjacent poles and the corresponding series-connected set of stationary contacts 4 of adjacent poles form a parallel connection between the two poles. The internal connecting part 1 is placed in the inner cavity 3a of the circuit breaker housing 3, thereby connecting the two poles in parallel to form a single pole of the same polarity or phase. (See attached diagram) Figure 6 and attached Figure 7 As shown, in this embodiment, a portion of the external heat dissipation part 2 on adjacent poles is provided with heat sink 9 for heat dissipation, while the other portion is not provided with heat sink 9 and serves as a wiring terminal 10 for connection with external conductors. Other structures are the same as in Embodiment 1, and will not be described in further detail here.

[0042] This invention provides a connecting busbar for heat dissipation in molded case circuit breakers and a heat dissipation structure for the molded case circuit breaker. It changes the conventional thinking in the art and addresses the technical defect of high temperature rise inside the casing when the shorting busbar is placed inside the casing. It breaks through the conventional thinking that when the moving contacts or stationary contacts of adjacent poles are connected in series by conductors inside the casing, there is no need to dissipate the heat inside the circuit breaker casing. By connecting the connecting part to the heat-generating part inside the circuit breaker cavity, the heat inside the cavity is discharged from the casing through the connecting part. This not only greatly and effectively reduces the temperature rise when the shorting busbar is placed inside the circuit breaker casing, but also does not occupy the space outside the circuit breaker casing.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connection bar for heat dissipation in molded case circuit breakers, characterized in that: It includes an inner connection part (1) and an outer heat dissipation part (2). The circuit breaker includes a base (6), a cover (7) and a contact system (8). The base (6) and the cover (7) enclose the inner cavity (3a) of the circuit breaker housing (3). The contact system (8) is located in the inner cavity (3a) of the housing (3). The inner connection part (1) is placed in the inner cavity (3a) of the circuit breaker housing (3) and connects adjacent moving contacts (5) and / or adjacent stationary contacts (4). The outer heat dissipation part (2) is connected to the inner connection part (1) and is placed outside the inner cavity (3a) of the circuit breaker housing (3). In the contact system (8), at least one set of moving contacts (5) of adjacent poles are connected in series through an internal connection part (1), and at least one set of stationary contacts (4) of adjacent poles corresponding to the moving contacts (5) of the at least one set of adjacent poles are connected in series through another internal connection part (1), so that the adjacent poles corresponding to the moving contacts (5) and the adjacent poles corresponding to the stationary contacts (4) are connected in parallel to form a pole of the same polarity or the same phase; When the adjacent poles of the moving contact (5) and the adjacent poles of the stationary contact (4) are connected in parallel to form a pole of the same polarity or phase, a part of the external heat dissipation part (2) corresponding to the same internal connection part (1) is used for heat dissipation, and the other part is used for wiring.

2. The connection bar for heat dissipation of molded case circuit breakers as described in claim 1, characterized in that: The external heat dissipation part (2) is located outside the inner cavity (3a) of the circuit breaker housing (3) and is also within the range of the circuit breaker housing (3).

3. A connection bar for heat dissipation of molded case circuit breakers as described in claim 1, characterized in that: The inner connecting part (1) is a hard conductor.

4. A connection bar for heat dissipation of molded case circuit breakers as described in claim 1, characterized in that: The inner connecting part (1) and the outer heat dissipation part (2) are integral or combined.

5. A connection bar for heat dissipation of a molded case circuit breaker as described in claim 1, characterized in that: The heat dissipation surface of the external heat dissipation part (2) is provided with heat dissipation fins (9), heat dissipation grooves, or heat dissipation holes in all or part of it.

6. A heat dissipation structure for a molded case circuit breaker, characterized in that: The contact system (8) includes the connecting strip described in any one of claims 1 to 5 above, wherein at least one set of adjacent moving contacts (5) in the contact system (8) are connected by an inner connecting part (1) and / or at least one set of adjacent stationary contacts (4) in the contact system (8) are connected by an inner connecting part (1), so that the adjacent poles corresponding to the moving contacts (5) and / or the adjacent poles corresponding to the stationary contacts (4) are connected to form a pole of the same polarity or the same phase.

7. The heat dissipation structure of a molded case circuit breaker as described in claim 6, characterized in that: In the contact system (8), at least one set of adjacent moving contacts (5) are connected in series through the inner connection part (1), or at least one set of adjacent stationary contacts (4) are connected in series through the inner connection part (1), so that the adjacent poles corresponding to the moving contact (5) or the adjacent poles corresponding to the stationary contact (4) are connected in series to form a pole with the same polarity or the same phase.

Images