Molded case circuit breaker

Abstract

The utility model relates to the technical field of electrical connection devices, in particular to a molded case circuit breaker. The molded case circuit breaker provided by the utility model comprises a circuit breaker main body and a terminal located outside the circuit breaker main body, the circuit breaker main body is used for controlling the on and off of an external circuit, and the terminal is used for electrically connecting the circuit breaker main body to the external circuit. The molded case circuit breaker also comprises an airflow channel at the wiring end, and the airflow channel leads to the interior of the circuit breaker main body through the wiring end, so that the communication between the circuit breaker main body and the external environment can be realized. Therefore, when the temperature in the circuit breaker main body is higher than the external environment, the internal heat of the circuit breaker main body can be dissipated to the external environment through the air flow channel, so that the problems of overheating and too fast temperature rise in the circuit breaker main body are solved, and the normal work of the molded case circuit breaker is facilitated.

Description

Technical Field

[0001] This application relates to the field of electrical connection device technology, and more particularly to a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are a common type of circuit protection device, used in new energy fields such as photovoltaics and energy storage. They are mainly used to control and protect circuits from electrical faults such as overload, short circuit, and undervoltage.

[0003] With social and economic development, the power system has become increasingly important in the national economy. The ever-increasing demand for electricity has driven the rapid development of the power industry, leading to a corresponding increase in the demand for circuit breakers and higher requirements for their temperature rise.

[0004] Currently, in order to improve the temperature rise of molded case circuit breakers, additional components are usually required, which leads to complex structure, complicated assembly, and increased cost of molded case circuit breakers. Utility Model Content

[0005] This application provides a molded case circuit breaker that can improve the temperature rise of the molded case circuit breaker without adding extra parts, and at a lower cost.

[0006] This application provides a molded case circuit breaker, including a circuit breaker body and terminals located outside the circuit breaker body. The circuit breaker body is used to control the closing and opening of an external circuit, and the terminals are used to electrically connect the circuit breaker body to the external circuit.

[0007] At the terminal, the molded case circuit breaker also includes an airflow channel, which leads from the terminal to the inside of the circuit breaker body, enabling the circuit breaker body to connect with the external environment.

[0008] The molded case circuit breaker provided in this application includes an airflow channel at the terminal. This airflow channel extends from the terminal to the interior of the circuit breaker body, enabling communication between the circuit breaker body and the external environment. Thus, when the temperature inside the circuit breaker body is higher than the external environment, the internal heat of the circuit breaker body is dissipated to the external environment through the airflow channel, alleviating the problem of overheating and rapid temperature rise inside the circuit breaker body. This is beneficial for the normal operation of the molded case circuit breaker and eliminates the need for additional components, saving costs.

[0009] In one possible design, the molded case circuit breaker includes a housing, a contact system, and wiring conductors. The housing includes a main mounting cavity and a wiring portion located outside the main mounting cavity, while the contact system is located within the main mounting cavity. The wiring conductors are fixedly connected to the wiring portion and extend into the main mounting cavity, where they are electrically connected to the contact system.

[0010] The circuit breaker body includes a main mounting cavity and a contact system. The terminals include a wiring section and a wiring conductor. An airflow channel is formed in the wiring section and extends from the wiring section to the main mounting cavity, communicating with the space within the main mounting cavity.

[0011] Based on the molded case circuit breaker provided in this embodiment, the casing of the molded case circuit breaker is typically manufactured by injection molding. The airflow channel is located at the wiring section; thus, the airflow channel can be formed simultaneously during the injection molding process when manufacturing the molded case circuit breaker casing, thereby simplifying the manufacturing process.

[0012] In one possible design, the wiring section includes an inlet wiring section and an outlet wiring section, which are located on opposite sides of the main mounting cavity.

[0013] The airflow channel includes a first sub-airflow channel extending from the incoming line connection part to the main mounting cavity, and a second sub-airflow channel extending from the outgoing line connection part to the main mounting cavity. Both the first and second sub-airflow channels can enable the circuit breaker body to connect with the external environment.

[0014] Based on the molded case circuit breaker provided in this embodiment, the airflow channel includes a first sub-airflow channel extending from the incoming line terminal to the main mounting cavity, and a second sub-airflow channel extending from the outgoing line terminal to the main mounting cavity. In this way, during operation, the heat generated inside the circuit breaker body can be simultaneously transferred to the external environment through both the first and second sub-airflow channels. This facilitates heat dissipation inside the circuit breaker body and promotes the normal operation of the molded case circuit breaker.

[0015] Furthermore, for the molded case circuit breaker as a whole, the first sub-airflow channel and the second sub-airflow channel are located on opposite sides of the circuit breaker body. In this way, the first sub-airflow channel, the circuit breaker body, and the second sub-airflow channel form a through-type heat dissipation channel, which further improves the heat dissipation effect.

[0016] In one possible design, the shell includes a base, which includes a bottom plate, n sidewalls, and 2(n-1) partitions, with the n sidewalls arranged sequentially along a first direction.

[0017] Along the second direction, the base plate is connected to the ends of multiple sidewalls. An installation area is formed between two adjacent sidewalls and the base plate. n is a natural number greater than or equal to 3 and less than or equal to 5.

[0018] Along the third direction, in each installation area, the two ends of the base belong to the incoming wiring section and the outgoing wiring section respectively, and the part between the incoming wiring section and the outgoing wiring section belongs to the main installation cavity.

[0019] The wiring conductors include a first conductor and a second conductor. In the third direction, at the inlet wiring section, the first conductor is fixedly connected to the base plate, and at the outlet wiring section, the second conductor is fixedly connected to the base plate.

[0020] Along the third direction, each installation area is provided with two partitions. One partition is located on the side of the first conductor away from the base plate, and the other partition is located on the side of the second conductor away from the base plate. The partitions form the cavity wall of the main installation cavity in the third direction.

[0021] The first sub-airflow channel and / or the second sub-airflow channel are disposed on the base plate. The first direction, the second direction, and the third direction are perpendicular to each other.

[0022] Based on the molded case circuit breaker provided by this embodiment, a first sub-airflow channel or a second sub-airflow channel is provided on the base plate. This not only connects the internal and external environments of the circuit breaker body and facilitates heat dissipation of the circuit breaker body, but also makes it difficult for the electric arc inside the circuit breaker body to leak from the first sub-airflow channel or the second sub-airflow channel, thus not affecting the safety of the molded case circuit breaker.

[0023] In one possible design, along the second direction, at the wiring section, the base plate includes a body portion and a protrusion extending relative to the body portion toward the mounting area.

[0024] The main body has a nut mounting hole for installing the wiring conductor.

[0025] The protrusion avoids the nut mounting hole, and the surface of the protrusion away from the body is used to place the wiring conductor. There is a first gap between the protrusion and the side wall, which extends from the end of the wiring part into the main mounting cavity.

[0026] Based on the molded case circuit breaker provided in this embodiment, the protrusion avoids the nut mounting hole, and the surface of the protrusion away from the body is used to place the wiring conductor. A first gap exists between the protrusion and the sidewall, extending from the end of the wiring portion into the main mounting cavity. When the wiring conductor is connected to the protrusion, the wiring conductor does not affect the existence of the first gap. The first gap in the inlet wiring portion can become part of a first sub-airflow channel, and the first gap in the outlet wiring portion can become part of a second sub-airflow channel, thereby connecting the internal and external spaces of the circuit breaker body. This structure is simple and easy to implement.

[0027] In one possible design, the protrusion includes a first sub-part, a second sub-part, and a third sub-part, which are arranged around the outer periphery of the nut mounting hole.

[0028] Along a third direction, the first sub-part and the second sub-part are arranged side by side on the side of the nut mounting hole near the main mounting cavity, and both extend into the main mounting cavity. The third sub-part is located on the side of the nut mounting hole away from the main mounting cavity, and there is a first sub-gap between the third sub-part and the first sub-part, and a second sub-gap between the third sub-part and the second sub-part.

[0029] Along the first direction, there is a third sub-gap between the first sub-part and the adjacent sidewall, a fourth sub-gap between the second sub-part and the adjacent sidewall, a fifth sub-gap between the first sub-part and the second sub-part, and a sixth sub-gap and a seventh sub-gap between the two sides of the third sub-part and the adjacent two sidewalls.

[0030] Along the third direction, the third sub-gap is connected to the sixth sub-gap, the fourth sub-gap is connected to the seventh sub-gap, the fifth sub-gap is connected to the sixth sub-gap through the first sub-gap, and the fifth sub-gap is connected to the seventh sub-gap through the second sub-gap.

[0031] Based on the molded case circuit breaker provided in this embodiment, in the wiring section, the protrusion includes a first sub-section, a second sub-section, and a third sub-section that are independent of each other, and there are gaps between the first sub-section, the second sub-section, and the third sub-section and the two side walls of the mounting area. There are also gaps between the first sub-section, the second sub-section, and the third sub-section. In this way, multiple gas channels are formed from the wiring section to the main mounting cavity, which helps the air circulation and heat exchange.

[0032] In one possible design, the first conductor extends into the main mounting cavity, and there is a second gap between the first conductor and at least one of the side walls on both sides, which can form a communication with the first gap of the incoming wiring portion.

[0033] Based on the molded case circuit breaker provided by this embodiment, the formation of a second gap between the first conductor and either of the two side walls, which is connected to the first gap of the incoming line terminal, will increase the cross-sectional area of ​​the first sub-airflow channel. In this way, more gas can flow through the first sub-airflow channel per unit time, which helps the heat in the main mounting cavity to be quickly dissipated to the incoming line end.

[0034] In one possible design, the second conductor extends into the main mounting cavity, and there is a third gap between the second conductor and at least one of the side walls on both sides, which can form a communication with the first gap of the outgoing wiring portion.

[0035] Based on the molded case circuit breaker provided by this embodiment, similar to the principle of the second gap setting, the third gap setting increases the cross-sectional area of ​​the second sub-airflow channel, which helps the heat in the main mounting cavity to dissipate quickly to the outgoing end.

[0036] In one possible design, the contact system includes a stationary contact, with the first conductor integrated into the stationary contact. This helps simplify the structure of the molded case circuit breaker, reduce costs, and improve assembly efficiency. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of a molded case circuit breaker provided in an embodiment of this application.

[0038] Figure 2 for Figure 1 Top view.

[0039] Figure 3 for Figure 1 The diagram shows a partial structural schematic of a molded case circuit breaker.

[0040] Figure 4 This is a schematic diagram of a base structure with partially concealed partitions, provided for an embodiment of this application.

[0041] Figure 5 for Figure 1 Side view.

[0042] Figure 6 for Figure 4 Top view.

[0043] Figure 7 for Figure 6 A magnified view of point G in the middle.

[0044] Figure 8 for Figure 1 A magnified view of point M in the middle.

[0045] The attached figures are labeled as follows:

[0046] A. Circuit breaker body;

[0047] B, terminal block; B1, incoming terminal; B2, outgoing terminal;

[0048] C, airflow channel; C1, first sub-airflow channel; C2, second sub-airflow channel;

[0049] 1. Housing; 1A. Main mounting cavity; 1B. Wiring section; 1B1. Inlet wiring section; 1B2. Outlet wiring section;

[0050] 11. Base; 111. Bottom plate; 112. Side wall; 113. Partition;

[0051] 111A, Body part; 111A1, Nut mounting hole; 111B, Protrusion; 111B1, First sub-part; 111B2, Second sub-part; 111B3, Third sub-part;

[0052] 12. Top cover;

[0053] 1F1, First sub-gap; 1F2, Second sub-gap; 1F3, Third sub-gap; 1F4, Fourth sub-gap; 1F5, Fifth sub-gap; 1F6, Sixth sub-gap; 1F7, Seventh sub-gap; 1X2, Second gap;

[0054] 2. Connecting conductor; 21. First conductor; 22. Second conductor;

[0055] 3. Stationary contact;

[0056] 4. Screws;

[0057] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0058] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0060] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0062] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by spacers, screws, bolts, or other spacers. A physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] The present application will be described in detail below with reference to the accompanying drawings.

[0065] Figure 1 This is a three-dimensional structural diagram of a molded case circuit breaker provided in an embodiment of this application. Figure 2 for Figure 1 For the top view, please refer to... Figure 1 and Figure 2 The molded case circuit breaker provided in this application includes a circuit breaker body A and a terminal B located outside the circuit breaker body A. The circuit breaker body A is used to control the closing and opening of an external circuit. The terminal B is used to electrically connect the circuit breaker body A to the external circuit.

[0066] At terminal B, the molded case circuit breaker also includes an airflow channel C, which leads from terminal B to the interior of the circuit breaker body A, enabling the circuit breaker body A to connect with the external environment.

[0067] For details, please refer to Figure 1 and Figure 2 The molded case circuit breaker is generally rectangular in shape, with the circuit breaker body A in the middle. Circuit breaker body A is the core component of the molded case circuit breaker, containing the contact system, arc-extinguishing system, etc. When interrupting large currents or carrying rated current for extended periods, the contact system of circuit breaker body A generates significant heat. During the interruption of large currents, arc energy is also converted into heat within the arc-extinguishing chamber. If the heat dissipation of circuit breaker body A is insufficient, the temperature rise will be further exacerbated.

[0068] The molded case circuit breaker has terminals B at both ends, which are exposed to the external environment and can quickly exchange heat with it. During use, the circuit breaker body A is connected to the external circuit through terminals B.

[0069] The molded case circuit breaker provided in this application has an airflow channel C that connects the circuit breaker body A to the external environment via the terminal B. This allows the circuit breaker body A to be connected to the external environment when the temperature inside the circuit breaker body A is higher than the external temperature. This dissipates the internal heat of the circuit breaker body A to the external environment through the airflow channel C, mitigating overheating and rapid temperature rise within the circuit breaker body A. This is beneficial for the normal operation of the molded case circuit breaker and eliminates the need for additional components, thus saving costs.

[0070] It should be noted that the technical solution of setting an airflow channel C at the terminal B of the molded case circuit breaker to reduce the internal temperature rise of the circuit breaker body A is not only applicable to molded case circuit breakers, but also applicable to other types of circuit breakers with similar requirements, such as miniature circuit breakers.

[0071] Figure 3 for Figure 1 Please refer to the partial structural diagram of the molded case circuit breaker shown below. Figure 1 and Figure 3 In some embodiments of this application, the molded case circuit breaker includes a housing 1, a contact system, and wiring conductors 2.

[0072] The housing 1 includes a main mounting cavity 1A and a wiring portion 1B located outside the main mounting cavity 1A. The contact system is located in the main mounting cavity 1A. The wiring conductor 2 is fixedly connected to the wiring portion 1B and extends into the main mounting cavity 1A, and is electrically connected to the contact system of the main mounting cavity 1A.

[0073] The circuit breaker body A includes the main mounting cavity 1A and the contact system. The terminal B includes the wiring section 1B and the wiring conductor 2.

[0074] Airflow channel C is formed in wiring part 1B and extends from wiring part 1B to main mounting cavity 1A, communicating with the space inside main mounting cavity 1A.

[0075] Specifically, the housing 1 of a molded case circuit breaker is generally made of insulating materials, such as bakelite, to provide good insulation performance. The contact system, as an important component of the molded case circuit breaker, is located within the main mounting cavity 1A of the housing 1. The wiring portion 1B on the housing 1 for mounting the wiring conductor 2 is located outside the main mounting cavity 1A for easy connection to external circuits.

[0076] The housing 1 of a molded case circuit breaker is typically manufactured using injection molding. In this embodiment, the airflow channel C is located at the wiring section 1B and extends from the wiring section 1B to the main mounting cavity 1A, communicating with the space within the main mounting cavity 1A. Thus, the airflow channel C can be formed simultaneously during the manufacturing of the molded case circuit breaker housing 1 through the injection molding process, thereby simplifying the manufacturing process.

[0077] It should be noted that in this application, the airflow channel C serves to connect the internal and external spaces of the circuit breaker body A. Therefore, the airflow channel C can be formed in the wiring part 1B, and in some cases, the airflow channel C can also be formed in the wiring conductor 2.

[0078] Please continue to refer to this. Figure 1 and Figure 3 In some embodiments of this application, the wiring section 1B includes an inlet wiring section 1B1 and an outlet wiring section 1B2, which are located on opposite sides of the main mounting cavity 1A.

[0079] The airflow channel C includes a first sub-airflow channel C1 extending from the incoming line connection part 1B1 to the main mounting cavity 1A, and a second sub-airflow channel C2 extending from the outgoing line connection part 1B2 to the main mounting cavity 1A. Both the first sub-airflow channel C1 and the second sub-airflow channel C2 can enable the circuit breaker body A to connect with the external environment.

[0080] For details, please refer to [link / reference]. Figure 1 and Figure 3 The wiring section 1B includes an incoming wiring section 1B1 and an outgoing wiring section 1B2. Both the incoming wiring section 1B1 and the outgoing wiring section 1B2 are provided with wiring conductors 2. When the molded case circuit breaker is in the closed state, the current flows from the wiring conductor 2 at the incoming wiring section 1B1 into the contact system in the main mounting cavity 1A, and flows out of the molded case circuit breaker through the wiring conductor 2 at the outgoing wiring section 1B2.

[0081] In this embodiment, the airflow channel C includes a first sub-airflow channel C1 extending from the inlet wiring portion 1B1 to the main mounting cavity 1A, and a second sub-airflow channel C2 extending from the outlet wiring portion 1B2 to the main mounting cavity 1A. Thus, during the operation of the molded case circuit breaker, the heat generated inside the circuit breaker body A can be simultaneously transferred to the external environment through both the first sub-airflow channel C1 and the second sub-airflow channel C2. This facilitates heat dissipation inside the circuit breaker body A and promotes the normal operation of the molded case circuit breaker.

[0082] Furthermore, for the molded case circuit breaker as a whole, the first sub-airflow channel C1 and the second sub-airflow channel C2 are located on opposite sides of the circuit breaker body A. In this way, the first sub-airflow channel C1, the circuit breaker body A, and the second sub-airflow channel C2 form a through-type heat dissipation channel, which further improves the heat dissipation effect.

[0083] Figure 4 This is a schematic diagram of a base structure with partially concealed partitions, provided for an embodiment of this application. Please refer to... Figure 3 and Figure 4In some embodiments of this application, the housing 1 includes a base 11, the base 11 includes a bottom plate 111, n side walls 112, and 2(n-1) partitions 113, and the n side walls 112 are arranged sequentially along the first direction D1.

[0084] Along the second direction D2, the base plate 111 is connected to the ends of a plurality of side walls 112. An installation area is formed between two adjacent side walls 112 and the base plate 111. n is a natural number greater than or equal to 3 and less than or equal to 5.

[0085] Along the third direction D3, in each installation area, the two ends of the base 11 belong to the incoming wiring section 1B1 and the outgoing wiring section 1B2 respectively, and the part between the incoming wiring section 1B1 and the outgoing wiring section 1B2 belongs to the main installation cavity 1A.

[0086] The wiring conductor 2 includes a first conductor 21 and a second conductor 22. Along the third direction D3, at the inlet wiring section 1B1, the first conductor 21 is fixedly connected to the base plate 111, and at the outlet wiring section 1B2, the second conductor 22 is fixedly connected to the base plate 111.

[0087] Along the third direction D3, each mounting area is provided with two partitions 113. One partition 113 is located on the side of the first conductor 21 away from the base plate 111, and the other partition 113 is located on the side of the second conductor 22 away from the base plate 111. The partitions 113 form the cavity wall of the main mounting cavity 1A in the third direction D3.

[0088] The first sub-airflow channel C1 and / or the second sub-airflow channel C2 are disposed on the base plate 111.

[0089] Figure 5 for Figure 1 Side view. Please refer to... Figure 1 , Figures 3 to 5 Specifically, the housing 1 of the molded case circuit breaker includes not only the base 11, but also the top cover 12. The base 11 is used to house the wiring conductor 2, the bearing contact system, the arc extinguishing system, the operating mechanism, and the tripping mechanism, etc. The top cover 12 is tightly fastened to the base 11 and covers the live parts inside the base 11 to prevent electric shock to personnel or intrusion of foreign objects.

[0090] Molded case circuit breakers include two-phase, three-phase, and four-phase molded case circuit breakers. The composition of the base 11 varies depending on the number of phases of the molded case circuit breaker.

[0091] When the molded case circuit breaker is a two-phase molded case circuit breaker, the base 11 has three side walls 112 and four partitions 113. The three side walls 112 and the base plate 111 form two mounting areas. The four partitions 113, the base plate 111 and the top cover 12 form the main mounting cavity 1A.

[0092] When the molded case circuit breaker is a three-phase molded case circuit breaker, the base 11 has four side walls 112 and six partitions 113, forming three mounting areas between the three side walls 112 and the base plate 111. The six partitions 113, the base plate 111, and the top cover 12 form the main mounting cavity 1A.

[0093] When the molded case circuit breaker is a four-phase molded case circuit breaker, the base 11 has five side walls 112 and eight partitions 113, forming four mounting areas between the three side walls 112 and the base plate 111. The eight partitions 113, the base plate 111, and the top cover 12 form the main mounting cavity 1A.

[0094] It should be noted that, under normal circumstances, although there are partitions between adjacent main mounting cavities 1A, the partitions 113 do not completely block the airflow, and the airflow between the multiple main mounting cavities 1A of the molded case circuit breaker is interconnected.

[0095] Please continue to refer to this. Figure 1 , Figure 3 and Figure 4 The contact system is located in the main mounting cavity 1A. The contact system includes a stationary contact 3 and a moving contact assembly. The stationary contact 3 is electrically connected to the first conductor 21, and the moving contact assembly is electrically connected to the second conductor 22. The closing and opening positions of the stationary contact 3 and the moving contact assembly are located on the side of the stationary contact 3 away from the base plate 111. The arc extinguishing system is also located on the side of the stationary contact 3 away from the base plate 111. When the moving contact and the stationary contact 3 are opened, the arc will move toward the arc extinguishing system on the side away from the base plate 111.

[0096] Based on this, in some embodiments of this application, a first sub-airflow channel C1 and / or a second sub-airflow channel C2 are provided on the base plate 111. This not only connects the internal and external environments of the circuit breaker body A and facilitates heat dissipation of the circuit breaker body A, but also makes it difficult for the electric arc inside the circuit breaker body A to leak from the first sub-airflow channel C1 and the second sub-airflow channel C2, thus not affecting the safety of the molded case circuit breaker.

[0097] Please continue to refer to this. Figure 3 and Figure 4 In some embodiments of this application, along the second direction D2, at the wiring portion 1B, the base plate 111 includes a body portion 111A and a protrusion 111B extending relative to the body portion 111A toward the mounting area.

[0098] The main body 111A has a nut mounting hole 111A1 for mounting the wiring conductor 2.

[0099] The protrusion 111B avoids the nut mounting hole 111A1. The surface of the protrusion 111B away from the body part 111A is used to place the wiring conductor 2. The protrusion 111B and the side wall 112 have a first gap, which extends from the end of the wiring part 1B into the main mounting cavity 1A.

[0100] Please continue to refer to this. Figure 3 and Figure 4 In this embodiment, the wiring section 1B can be either an incoming wiring section 1B1 or an outgoing wiring section 1B2. As one way of setting the wiring terminal B of the molded case circuit breaker, a nut mounting hole 111A1 is provided on the base plate 111 of the wiring section 1B. A nut is fixed in the nut mounting hole 111A1, and the wiring conductor 2 is fixed to the base plate 111 by a threaded fastener. The wiring conductor 2 will expose the nut. In this way, the conductive busbar of the external circuit can be fixedly connected to the wiring conductor 2 by a screw 4 that mates with the nut, and the electrical connection between the two is realized at the same time.

[0101] In this embodiment, the protrusion 111B avoids the nut mounting hole 111A1. The surface of the protrusion 111B away from the body portion 111A is used to place the wiring conductor 2, and a first gap exists between the protrusion 111B and the side wall 112. The first gap extends from the end of the wiring portion 1B into the main mounting cavity 1A. When the wiring conductor 2 is connected to the protrusion 111B, the wiring conductor 2 does not affect the existence of the first gap. The first gap in the inlet wiring portion 1B1 can become part of the first sub-airflow channel C1, and the first gap in the outlet wiring portion 1B2 can become part of the second sub-airflow channel C2, thereby connecting the internal and external spaces of the main mounting cavity 1A. This structure is simple and easy to implement.

[0102] Figure 6 for Figure 4 Top view, Figure 7 for Figure 6 Please refer to the enlarged image at point G in the middle. Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments of this application, the protrusion 111B includes a first sub-part 111B1, a second sub-part 111B2, and a third sub-part 111B3, which are arranged around the outer periphery of the nut mounting hole 111A1.

[0103] Along the third direction D3, the first sub-part 111B1 and the second sub-part 111B2 are arranged side by side in the nut mounting hole 111A1 on the side near the main mounting cavity 1A, and both extend into the main mounting cavity 1A. The third sub-part 111B3 is located on the side of the nut mounting hole 111A1 away from the main mounting cavity 1A, and there is a first sub-gap 1F1 between the third sub-part 111B3 and the first sub-part 111B1, and a second sub-gap 1F2 between the third sub-part 111B3 and the second sub-part 111B2.

[0104] Along the first direction D1, the first sub-part 111B1 has a third sub-gap 1F3 between itself and the adjacent side wall 112, the second sub-part 111B2 has a fourth sub-gap 1F4 between itself and the adjacent side wall 112, the first sub-part 111B1 and the second sub-part 111B2 have a fifth sub-gap 1F5, and the two sides of the third sub-part 111B3 and the adjacent two side walls 112 form a sixth sub-gap 1F6 and a seventh sub-gap 1F7.

[0105] Along the third direction D3, the third sub-gap 1F3 is connected to the sixth sub-gap 1F6, the fourth sub-gap 1F4 is connected to the seventh sub-gap 1F7, the fifth sub-gap 1F5 is connected to the sixth sub-gap 1F6 through the first sub-gap 1F1, and the fifth sub-gap 1F5 is connected to the seventh sub-gap 1F7 through the second sub-gap 1F2.

[0106] Figure 7 The dashed lines with arrows indicate the direction of heat flow. Please continue to refer to [the documentation / reference]. Figure 3 , Figure 4 , Figure 6 and Figure 7 In the wiring section 1B, the protrusion 111B includes a first sub-section 111B1, a second sub-section 111B2, and a third sub-section 111B3 that are independent of each other. There are gaps between the first sub-section 111B1, the second sub-section 111B2, and the third sub-section 111B3 and the two side walls 112 of the mounting area. There are also gaps between the first sub-section 111B1, the second sub-section 111B2, and the third sub-section 111B3. In this way, multiple gas channels are formed from the wiring section B1 to the main mounting cavity A1, which helps the air circulation and heat exchange.

[0107] Figure 8 for Figure 1 Please refer to the enlarged view at point M. Figure 1 , Figure 3 and Figure 8 In some embodiments of this application, the first conductor 21 extends to the main mounting cavity 1A, and the first conductor 21 has a second gap 1X2 between it and at least one of the side walls 112 on both sides, which can form a communication with the first gap of the incoming wiring portion 1B1.

[0108] Specifically, in this embodiment, the formation of a second gap 1X2 between the first conductor 21 and either of the side walls 112 on both sides, which is connected to the first gap of the inlet wiring portion 1B1, will increase the cross-sectional area of ​​the first sub-airflow channel C1. In this way, more gas can flow through the first sub-airflow channel C1 per unit time, which helps the heat in the main mounting cavity 1A to be quickly dissipated to the inlet end B1.

[0109] Please continue to refer to this. Figure 1 and Figure 3 In some embodiments of this application, the second conductor 22 extends into the main mounting cavity 1A, and a third gap is formed between the second conductor 22 and at least one of the side walls 112 on both sides, which can communicate with the first gap of the outgoing terminal 1B2. Similar to the principle of the second gap, the third gap increases the cross-sectional area of ​​the second sub-airflow channel C2, which helps the heat in the main mounting cavity 1A to be quickly dissipated to the outgoing terminal B2.

[0110] Please continue to refer to this. Figure 3 In some embodiments of this application, the contact system includes a stationary contact 3, and the first conductor 21 and the stationary contact 3 are integrally formed. This helps to simplify the structure of the molded case circuit breaker, reduce costs, and improve assembly efficiency.

[0111] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0112] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application 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 of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A molded case circuit breaker, characterized in that, It includes a circuit breaker body and a terminal block located outside the circuit breaker body. The circuit breaker body is used to control the closing and opening of an external circuit, and the terminal block is used to electrically connect the circuit breaker body to the external circuit. At the terminal, the molded case circuit breaker also includes an airflow channel, which leads from the terminal to the interior of the circuit breaker body, enabling communication between the circuit breaker body and the external environment.

2. The molded case circuit breaker according to claim 1, characterized in that, The molded case circuit breaker includes a housing, a contact system, and wiring conductors; The housing includes a main mounting cavity and a wiring portion located outside the main mounting cavity, and the contact system is located in the main mounting cavity; the wiring conductor is fixedly connected to the wiring portion and extends into the main mounting cavity, and is electrically connected to the contact system of the main mounting cavity; The circuit breaker body includes the main mounting cavity and the contact system; the terminal includes the wiring portion and the wiring conductor. The airflow channel is formed at the wiring portion and extends from the wiring portion to the main mounting cavity, communicating with the space inside the main mounting cavity.

3. The molded case circuit breaker according to claim 2, characterized in that, The wiring section includes an inlet wiring section and an outlet wiring section, which are located on opposite sides of the main mounting cavity; The airflow channel includes a first sub-airflow channel extending from the inlet wiring portion to the main mounting cavity, and a second sub-airflow channel extending from the outlet wiring portion to the main mounting cavity. Both the first sub-airflow channel and the second sub-airflow channel can enable the circuit breaker body to communicate with the external environment.

4. The molded case circuit breaker according to claim 3, characterized in that, The housing includes a base, the base includes a bottom plate, n side walls, and 2(n-1) partitions, with the n side walls arranged sequentially along a first direction; Along the second direction, the base plate is connected to the ends of the plurality of sidewalls; an installation area is formed between two adjacent sidewalls and the base plate; n is a natural number greater than or equal to 3 and less than or equal to 5; Along the third direction, in each installation area, the two ends of the base belong to the incoming wiring section and the outgoing wiring section respectively, and the part between the incoming wiring section and the outgoing wiring section belongs to the main installation cavity; The wiring conductor includes a first conductor and a second conductor. Along the third direction, at the inlet wiring section, the first conductor is fixedly connected to the base plate, and at the outlet wiring section, the second conductor is fixedly connected to the base plate. Along the third direction, each of the mounting areas is provided with two partitions, one partition is provided on the side of the first conductor away from the bottom plate, and the other partition is provided on the side of the second conductor away from the bottom plate, the partitions forming the cavity wall of the main mounting cavity in the third direction; The first sub-airflow channel and / or the second sub-airflow channel are disposed on the base plate; The first direction, the second direction, and the third direction are perpendicular to each other.

5. The molded case circuit breaker according to claim 4, characterized in that, Along the second direction, at the wiring portion, the base plate includes a body portion and a protrusion extending relative to the body portion toward the mounting area; The main body has a nut mounting hole for installing the wiring conductor; The protrusion avoids the nut mounting hole, the surface of the protrusion away from the body is used to place the wiring conductor, and there is a first gap between the protrusion and the side wall, the first gap extending from the end of the wiring portion into the main mounting cavity.

6. The molded case circuit breaker according to claim 5, characterized in that, The protrusion includes a first sub-part, a second sub-part, and a third sub-part, which are arranged around the outer periphery of the nut mounting hole; Along the third direction, the first sub-part and the second sub-part are arranged side by side on the side of the nut mounting hole near the main mounting cavity, and both extend into the main mounting cavity; the third sub-part is located on the side of the nut mounting hole away from the main mounting cavity, and there is a first sub-gap between the third sub-part and the first sub-part, and a second sub-gap between the third sub-part and the second sub-part; Along the first direction, there is a third sub-gap between the first sub-part and the adjacent sidewall, a fourth sub-gap between the second sub-part and the adjacent sidewall, a fifth sub-gap between the first sub-part and the second sub-part, and the two sides of the third sub-part and the adjacent two sidewalls form a sixth sub-gap and a seventh sub-gap. Along the third direction, the third sub-gap is connected to the sixth sub-gap, the fourth sub-gap is connected to the seventh sub-gap, the fifth sub-gap is connected to the sixth sub-gap through the first sub-gap, and the fifth sub-gap is connected to the seventh sub-gap through the second sub-gap.

7. The molded case circuit breaker according to claim 5, characterized in that, The first conductor extends into the main mounting cavity, and there is a second gap between the first conductor and at least one of the side walls on both sides, which can form a communication with the first gap of the incoming wiring portion.

8. The molded case circuit breaker according to claim 5, characterized in that, The second conductor extends into the main mounting cavity, and there is a third gap between the second conductor and at least one of the side walls on both sides, which can form a communication with the first gap of the outgoing wiring portion.

9. The molded case circuit breaker according to claim 4, characterized in that, The contact system includes a stationary contact, and the first conductor and the stationary contact are an integral structure.

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