circuit breaker

Abstract

This application provides a circuit breaker, relating to the field of low-voltage electrical equipment technology. The circuit breaker includes a housing assembly, trip units, and an electromagnetic shielding sheet. The housing assembly includes multiple spaced-apart receiving cavities. Trip units are installed in the receiving cavities, the number of trip units equals the number of receiving cavities, and each trip unit corresponds one-to-one with a receiving cavity; adjacent trip units are mutually insulated. The electromagnetic shielding sheet is fixedly installed in the housing assembly and is disposed between adjacent trip units. According to the circuit breaker provided in this application, the electromagnetic shielding sheet, disposed between adjacent trip units, can reduce the possibility of mutual interference between adjacent trip units, thereby reducing the possibility of mutual interference affecting the operating current of the trip units and ensuring the reliability of the circuit breaker's short-circuit protection function.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more particularly to a circuit breaker. Background Technology

[0002] Short-circuit protection and overload protection are among the important protection functions of circuit breakers. The short-circuit protection function of a circuit breaker mainly relies on the trip unit. To ensure the reliability of the short-circuit protection function of the circuit breaker, the operating current of the trip unit is usually tested at the factory.

[0003] However, during the detection of trip unit operating current, the operating current is usually only detected for the trip units of each phase of the circuit breaker. In the use of multi-phase circuit breakers, the trip units in each phase may affect each other, thereby affecting the operating current of the trip units and reducing the reliability of the circuit breaker's short-circuit protection and overload protection functions. Utility Model Content

[0004] This application provides a circuit breaker. According to the example circuit breaker provided in this application, the circuit breaker includes an electromagnetic shielding sheet. The electromagnetic shielding sheet disposed between two adjacent trip units can reduce the possibility of mutual influence between the two adjacent trip units, thereby reducing the possibility of affecting the operating current of the trip units and ensuring the reliability of the short-circuit protection function and overload protection function of the circuit breaker.

[0005] In a first aspect, this application provides a circuit breaker. The circuit breaker includes a housing assembly, trip units, and an electromagnetic shielding sheet. The housing assembly includes a plurality of spaced-apart receiving cavities. The trip units are installed in the receiving cavities, the number of trip units equals the number of receiving cavities, and each trip unit corresponds one-to-one with a receiving cavity, with adjacent trip units being mutually insulated. The electromagnetic shielding sheet is fixedly installed in the housing assembly and is disposed between adjacent trip units.

[0006] In this application example, the housing assembly can provide a mounting carrier for the trip unit and the electromagnetic shielding sheet. The trip unit can activate other internal structures of the circuit breaker when a short circuit or other fault occurs, providing safety for the circuit. When the trip unit generates a magnetic field due to the current in the circuit, the electromagnetic shielding sheet located between two adjacent trip units can reduce the possibility of mutual interference between them, thereby reducing the possibility of affecting the trip unit's operating current and ensuring the reliability of the circuit breaker's short-circuit protection and overload protection functions.

[0007] In some possible implementations, the housing assembly includes a partition disposed between two adjacent receiving cavities, and an electromagnetic shielding sheet is fixedly connected to the partition.

[0008] In this example, the housing assembly includes a partition, meaning the partition is part of the housing assembly. The electromagnetic shielding sheet is fixedly connected to the partition, which can reduce the amplitude of the electromagnetic shielding sheet's sway relative to the partition. Furthermore, since the partition is located between two adjacent receiving cavities, and each receiving cavity contains a corresponding tripping device, and the electromagnetic shielding sheet is fixedly connected to the partition, the electromagnetic shielding sheet can be positioned between two adjacent receiving cavities via the partition, reducing the possibility of mutual interference between the tripping devices in the two adjacent receiving cavities.

[0009] In some possible implementations, the partition is provided with a receiving groove into which at least a portion of the electromagnetic shielding sheet is inserted to securely connect the electromagnetic shielding sheet to the partition.

[0010] In this example, the partition is provided with a receiving groove, and at least part of the electromagnetic shielding sheet is inserted into the receiving groove. Based on this, the partition wraps at least part of the electromagnetic shielding sheet, and the partition can provide protection for the electromagnetic shielding sheet and reduce the possibility of damage to the electromagnetic shielding sheet.

[0011] In some possible implementations, the housing assembly includes a mating base and a middle cover, which together form a receiving cavity. A partition is fixedly connected to the base, and the opening of the receiving groove faces the middle cover, which then covers the opening of the receiving groove. Alternatively, the partition is fixedly connected to the middle cover, and the opening of the receiving groove faces the base, which can cover the opening of the receiving groove.

[0012] In this application example, the base and the middle cover cooperate to form a receiving cavity, providing an installation carrier for structures such as the electromagnetic shielding sheet and the trip unit. The partition is fixed to the base, and the opening of the receiving groove on the partition faces the middle cover. The electromagnetic shielding sheet can be installed in the receiving groove, and the middle cover can cover the opening of the receiving groove. Based on this, when the electromagnetic shielding sheet tends to detach from the receiving groove, the electromagnetic shielding sheet can impact the middle cover, that is, the middle cover can prevent the electromagnetic shielding sheet from detaching from the receiving groove, ensuring the assembly reliability of the electromagnetic shielding sheet and the receiving groove, and thus ensuring the assembly reliability of the electromagnetic shielding sheet and the partition.

[0013] With the partition plate fixedly connected to the middle cover, the opening of the receiving groove on the partition plate faces the base, and the electromagnetic shielding sheet can be installed in the receiving groove. The base can block the opening of the receiving groove. Based on this, when the electromagnetic shielding sheet tends to detach from the receiving groove, the electromagnetic shielding sheet can impact the base. That is, the base can prevent the electromagnetic shielding sheet from detaching from the receiving groove, ensuring the assembly reliability of the electromagnetic shielding sheet and the receiving groove, and thus ensuring the assembly reliability of the electromagnetic shielding sheet and the partition plate.

[0014] In some possible implementations, the electromagnetic shielding sheet includes a first portion and a second portion, the first portion extending into the receiving groove and fixedly connected to the partition, and the second portion protruding out of the receiving groove and cooperating with the middle cover.

[0015] In this example, the first portion extends into the receiving groove and is fixedly connected to the partition plate, which is fixedly installed on the base. Therefore, the first portion is connected to the base. The second portion protrudes from the receiving groove and mates with the middle cover. Since both the first and second portions are part of the electromagnetic shielding sheet, the electromagnetic shielding sheet provided in this example can function simultaneously within both the base and the middle cover. This results in a larger effective area for the electromagnetic shielding sheet to reduce the mutual interference between two adjacent trip units, further reducing the possibility of mutual interference between two adjacent trip units.

[0016] In some possible implementations, the housing assembly includes a mating base, a middle cover, and a bottom plate. The bottom plate is located on the side of the base away from the middle cover. The base and the middle cover mate to form a receiving cavity. A partition is fixedly connected to the base. The opening of the receiving groove is located away from the base. The bottom plate covers the opening of the receiving groove.

[0017] In this example, the base and the middle cover cooperate to form a receiving cavity, providing an installation carrier for structures such as the electromagnetic shielding sheet and the trip unit. A partition is fixed to the base, and a bottom plate is located on the side of the base away from the middle cover. The opening of the receiving groove on the partition faces the bottom plate, allowing the electromagnetic shielding sheet to be installed in the receiving groove. The bottom plate can block the opening of the receiving groove. Therefore, when the electromagnetic shielding sheet tends to detach from the receiving groove, it can impact the bottom plate, preventing the electromagnetic shielding sheet from detaching from the receiving groove. This ensures the assembly reliability of the electromagnetic shielding sheet and the receiving groove, and consequently, the assembly reliability of the electromagnetic shielding sheet and the partition.

[0018] In some possible implementations, the circuit breaker includes a connecting piece that is electrically connected to a trip unit, the housing assembly has a mounting slot that communicates with a receiving cavity, the connecting piece is installed into the mounting slot, and the opening of the receiving slot is located on the side of the partition near the mounting slot.

[0019] In this application example, the mounting groove provided in the housing assembly provides mounting space for the connecting piece, which enables the circuit breaker to make an electrical connection with the power supply line. The mounting groove communicates with the receiving cavity, and the opening of the receiving groove on the partition is opened on the side of the partition near the mounting groove, so that the partition can extend into the mounting groove from the opening of the receiving groove to achieve the cooperation between the receiving groove and the partition.

[0020] In some possible implementations, the opening of the receiving groove is provided with a first guide surface, the inclination direction of which is adapted to the direction in which the electromagnetic shielding sheet is inserted into the receiving groove. And / or, the electromagnetic shielding sheet is provided with a second guide surface, the inclination direction of which is adapted to the direction in which the electromagnetic shielding sheet is inserted into the receiving groove.

[0021] By providing a first guide surface at the opening of the receiving groove, and ensuring that the inclination direction of the first guide surface matches the direction in which the electromagnetic shielding sheet is inserted into the receiving groove, the size of the receiving groove gradually decreases along the direction in which the electromagnetic shielding sheet is inserted. Therefore, during the insertion process of the electromagnetic shielding sheet into the receiving groove, the electromagnetic shielding sheet can first penetrate the largest part of the receiving groove, which helps to improve the efficiency of inserting the electromagnetic shielding sheet into the receiving groove.

[0022] By providing a second guide surface at the electromagnetic shielding sheet, and ensuring that the inclination direction of the second guide surface matches the direction in which the electromagnetic shielding sheet extends into the receiving groove, the size of the electromagnetic shielding sheet gradually decreases along the direction of insertion into the receiving groove. Therefore, during the insertion process, the smallest portion of the electromagnetic shielding sheet can be inserted into the receiving groove first, which improves the efficiency of insertion.

[0023] In some possible implementations, the plurality of spaced-apart cavities include a first cavity and a second cavity, with a partition between the first and second cavities. The electromagnetic shielding sheet includes a first shielding sheet disposed on the side of the partition facing the first cavity. And / or, the electromagnetic shielding sheet includes a second shielding sheet disposed on the side of the partition facing the second cavity.

[0024] In this example, since the partition is located between the first receiving cavity and the second receiving cavity, and the first shielding plate, which faces the partition towards the first receiving cavity, is located between the first and second receiving cavities, the first shielding plate can reduce the possibility of mutual interference between the trip unit located in the first receiving cavity and the trip unit located in the second receiving cavity. The second shielding plate plays a similar role to the first shielding plate; for details on the role of the second shielding plate, please refer to the relevant description of the first shielding plate, which will not be elaborated upon in this example.

[0025] In some possible implementations, where the electromagnetic shielding sheet includes a first shielding sheet, the circuit breaker also includes a first protective plate, which is disposed on the side of the partition facing the first receiving cavity, with the first protective plate and the partition spaced apart, and the first shielding sheet located between the first protective plate and the partition.

[0026] When the electromagnetic shielding sheet includes a second shielding sheet, the circuit breaker also includes a second protective plate, which is disposed on the side of the partition facing the second receiving cavity, and the second protective plate is spaced apart from the partition, with the second shielding sheet located between the second protective plate and the partition.

[0027] In this example, the first shielding plate is disposed between the first protective plate and the partition, meaning that the partition and the first protective plate cooperate to provide installation space for the first shielding plate. Based on this, since the first protective plate is located on the side of the partition facing the first receiving cavity, the first protective plate is situated on the side of the first shielding plate facing the first receiving cavity. During the use of the circuit breaker, the first protective plate can provide protection for the first shielding plate, reducing the possibility of damage to the first shielding plate from other structures within the circuit breaker.

[0028] The structure of the second protective plate is similar to that of the first protective plate, and it plays a similar role. The example in this application will not be repeated here. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a circuit breaker provided as an example of this application.

[0030] Figure 2 This is a schematic diagram of the structure of a base provided as an example of this application.

[0031] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0032] Figure 4 This is a schematic diagram of the structure of a base provided as an example of this application.

[0033] Figure 5 for Figure 4 Sectional view along the middle AA.

[0034] Figure 6 This is a schematic diagram of the mating structure of a base and a bottom plate, provided as an example of this application.

[0035] Figure 7 for Figure 6 Sectional view at the middle BB.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100 Circuit breaker; 110 Base; 120 Receiving cavity; 121 First receiving cavity; 122 Second receiving cavity; 130 Electromagnetic shielding sheet; 140 Tripping device; 150 Partition plate; 160 Receiving groove; 170 Mounting groove; 180 Terminal piece; 190 Base plate. Detailed Implementation

[0038] To make the purpose, technical solutions, and advantages of the examples in this application clearer, the technical solutions in the examples of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only a part of the examples in this application, not all of them. Based on the examples in this application, all other examples obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0039] 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 pertains; the terms used herein in the description of the application are for the purpose of describing particular examples only and are not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the description, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0040] In this document, the term "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of this application. The appearance of the phrase "example" in various places in the specification does not necessarily refer to the same example, nor is it a separate or alternative example mutually exclusive with other examples. It will be explicitly and implicitly understood by those skilled in the art that the examples described herein can be combined with other examples.

[0041] 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.

[0042] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the circuit breaker in this application.

[0043] 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.

[0044] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0045] In the description of this application, it should be noted that, unless otherwise explicitly 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, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; 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 based on the specific circumstances.

[0046] Short-circuit protection and overload protection are among the important protection functions of circuit breakers. The short-circuit protection function of a circuit breaker mainly relies on the trip unit. To ensure the reliability of the short-circuit protection function of the circuit breaker, the operating current of the trip unit is usually tested at the factory.

[0047] However, during the detection of trip unit operating current, the operating current is usually only detected for each phase of the circuit breaker. In the use of multi-phase circuit breakers, when a short circuit or overload occurs in the circuit connected to the circuit breaker, the short-circuit current flowing through the trip unit generates a magnetic field. The magnetic fields generated at different trip units will affect each other, thus influencing the operating current of the trip units and impacting the reliability of the circuit breaker's short-circuit protection function.

[0048] Based on the above, this application provides an example of a circuit breaker.

[0049] To enable those skilled in the art to better understand the present application, the circuit breaker provided in the example of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0050] For example, this application provides a circuit breaker. Figure 1 This application provides a schematic diagram of the structure of a circuit breaker as an example. Figure 2 This application provides a schematic diagram of the structure of a base. Figure 3 for Figure 2 A magnified view of a portion at point A. Please refer to... Figures 1-3 The circuit breaker 100 includes a housing assembly, a trip unit 140, and an electromagnetic shielding plate 130. The housing assembly includes multiple spaced-apart receiving cavities 120. The trip units 140 are installed in the receiving cavities 120, and the number of trip units 140 equals the number of receiving cavities 120, with each trip unit 140 corresponding to a single receiving cavity 120. Adjacent trip units 140 are insulated from each other. The electromagnetic shielding plate 130 is fixedly installed in the housing assembly and is located between adjacent trip units 140.

[0051] The housing assembly is made of insulating materials, such as polyvinyl chloride (PVC) and polycarbonate (PC plastic). The use of insulating materials reduces the possibility of current escaping from the housing assembly to the outside, ensuring the safe operation of the circuit breaker 100.

[0052] The trip unit 140 includes a thermal element, an armature, and a flexible connection structure. One end of the flexible connection structure is connected to the thermal element, and the other end is connected to the moving contact. The flexible connection structure can be made of copper braided wire, copper strip, etc.

[0053] During the operation of the circuit breaker 100, the flexible connection structure and thermal element are prone to generating magnetic fields under the condition of circuit overload or current short circuit.

[0054] The moving contact is part of the contact mechanism, which also includes the stationary contact. When the moving contact is in contact with the stationary contact, the circuit breaker 100 is in the closed state, and the circuit connected to the circuit breaker 100 is in the continuous state. When the moving contact is separated from the stationary contact, the circuit breaker 100 is in the open state or tripped state, and the circuit electrically connected to the circuit breaker 100 is in the open state.

[0055] The trip unit 140, the contact mechanism, and the connecting piece 180 of the circuit breaker 100 work together to form the internal circuit of the circuit breaker 100. The connecting piece 180 of the internal circuit is electrically connected to the circuit, which can realize the electrical connection between the circuit breaker 100 and the circuit.

[0056] The trip unit 140 can actuate the moving contact in the contact mechanism in the event of a short circuit or overload, causing the moving contact to separate from the stationary contact, thereby putting the circuit in an open circuit state and reducing the possibility of the short circuit or overload fault further expanding in the circuit.

[0057] An insulating plate may be provided between two adjacent trip units 140. The insulating plate may be part of the cavity wall of the receiving cavity 120. The insulating plate may be a single plate structure or may consist of multiple sub-plates. This application example does not impose specific limitations in this regard.

[0058] The electromagnetic shielding sheet 130 is disposed between two adjacent trip units 140. The electromagnetic shielding sheet 130 can be disposed between two adjacent trip units 140 independently of the cavity wall of the receiving cavity 120, or the electromagnetic shielding sheet 130 can be connected to the cavity wall of the receiving cavity 120. This application does not impose specific limitations on this.

[0059] The electromagnetic shielding sheet 130 can be fixedly connected to the housing assembly by means of plugging, bonding or other methods.

[0060] The electromagnetic shielding sheet 130 can be made of materials capable of shielding magnetic fields, such as silicon steel, ferrite, and iron-nickel alloy.

[0061] In this application example, the housing assembly can provide a mounting carrier for the trip unit 140 and the electromagnetic shielding sheet 130. The trip unit 140 can activate other internal structures of the circuit breaker 100 when a short circuit or other fault occurs, providing safety protection for the circuit. When the trip unit 140 generates a magnetic field due to the current in the circuit, the electromagnetic shielding sheet 130 located between two adjacent trip units 140 can reduce the possibility of mutual interference between the two adjacent trip units 140, thereby reducing the possibility of affecting the operating current of the trip unit 140 and ensuring the reliability of the short-circuit protection and overload protection functions of the circuit breaker 100.

[0062] Based on the circuit breaker 100 provided in the example above, please refer to... Figures 1-3 The housing assembly includes a partition 150, which is disposed between two adjacent receiving cavities 120, and an electromagnetic shielding sheet 130 is fixedly connected to the partition 150.

[0063] The partition 150 can be integrally formed with other structures of the housing assembly, or the partition 150 can be fixedly connected to other structures of the housing assembly by means of plugging, bonding or other methods.

[0064] The partition 150 can be used to isolate two adjacent receiving cavities 120. The sidewall of the partition 150 can be the cavity wall of the receiving cavity 120. In this case, the partition 150 can be the insulating plate mentioned above. Alternatively, based on the insulating plate provided between two adjacent receiving cavities 120, the partition 150 can be provided with an insulating gap, or the partition 150 can be fixedly connected to the insulating plate. This application example does not specifically limit this.

[0065] The electromagnetic shielding sheet 130 can be fixedly connected to the partition 150 by means of adhesive bonding, snap-fit, etc. The partition 150 can be fixedly connected to one electromagnetic shielding sheet 130, or multiple electromagnetic shielding sheets 130 can be fixedly connected to the partition 150 at the same time. This application example does not make specific limitations in this regard.

[0066] For example, a partition 150 may be connected to only one electromagnetic shielding sheet 130. In this case, the electromagnetic shielding sheet 130 may be connected to the side of the partition 150 facing either of the receiving cavities 120, or the electromagnetic shielding sheet 130 may be installed inside the partition 150.

[0067] For example, a partition 150 may also be connected to two electromagnetic shielding plates (not shown in the figure). In this case, the two electromagnetic shielding plates 130 may be fixedly connected to the side of the partition 150 facing different receiving cavities 120 respectively.

[0068] In this example, the housing assembly includes a partition 150, meaning the partition 150 is part of the housing assembly. The electromagnetic shielding sheet 130 is fixedly connected to the partition 150, which can reduce the amplitude of the electromagnetic shielding sheet 130's sway relative to the partition 150. Furthermore, since the partition 150 is located between two adjacent receiving cavities 120, and each receiving cavity 120 contains a corresponding trip unit 140, and the electromagnetic shielding sheet 130 is fixedly connected to the partition 150, the electromagnetic shielding sheet 130 can be positioned between two adjacent receiving cavities 120 via the partition 150, reducing the possibility of mutual interference between the trip units 140 in the two adjacent receiving cavities 120.

[0069] Based on the circuit breaker 100 provided in the example above, please refer to... Figures 1-3 The partition 150 is provided with a receiving groove 160, and at least part of the electromagnetic shielding sheet 130 is inserted into the receiving groove 160 so that the electromagnetic shielding sheet 130 is fixedly connected to the partition 150.

[0070] The receiving groove 160 can communicate with the receiving cavity 120 on either side of the partition 150, or the receiving groove 160 can be spaced apart from the receiving cavities 120 on both sides of the partition 150. In this application example, the receiving groove 160 is only described as being spaced apart from the receiving cavities 120 on both sides of the partition 150.

[0071] The electromagnetic shielding sheet 130 can be fully inserted into the receiving groove 160, or only part of the electromagnetic shielding sheet 130 can be inserted into the receiving groove 160.

[0072] The partition 150 and the receiving groove 160 can be at least partially interference-fitted, or the partition 150 can be clearance-fitted with the receiving groove 160. The opening of the receiving groove 160 can also be provided with a protruding structure, which can limit the electromagnetic shielding sheet 130 and reduce the possibility of the electromagnetic shielding sheet 130 detaching from the receiving groove 160.

[0073] In this example, the partition 150 is provided with a receiving groove 160, and at least a portion of the electromagnetic shielding sheet 130 is inserted into the receiving groove 160. Based on this, the partition 150 wraps at least a portion of the electromagnetic shielding sheet 130, which can provide protection for the electromagnetic shielding sheet 130 and reduce the possibility of damage to the electromagnetic shielding sheet 130.

[0074] There are multiple ways to configure the receiving slot 160. The following is an example of how to configure the receiving slot 160.

[0075] For example, Figure 4 This application provides a schematic diagram of the structure of a base. Figure 5 for Figure 4 Please refer to the sectional view at point AA. Figure 4 and Figure 5The housing assembly includes a mating base 110 and a middle cover, which together form a receiving cavity 120. A partition 150 is fixedly connected to the base 110, and the opening of a receiving groove 160 faces the middle cover, which covers the opening of the receiving groove 160. Alternatively, the partition is fixedly connected to the middle cover, the opening of the receiving groove faces the base 110, and the base 110 can cover the opening of the receiving groove.

[0076] The base 110 and the middle cover can be connected by snap-fit, riveting, or textured connection.

[0077] When the partition 150 is fixedly installed on the base 110, the way the partition 150 is matched with the middle cover is similar to the way the partition 150 is matched with the base 110 when the partition 150 is fixedly installed on the middle cover, and the functions are similar. This application example only describes the partition 150 being fixedly installed on the base 110 as an example.

[0078] The partition 150 is fixedly installed on the side of the base 110 facing the middle cover. Along the direction from the middle cover to the base 110, the size of the partition 150 can be approximately equal to the size of the receiving cavity 120, or the size of the partition 150 can be smaller than the size of the receiving cavity 120.

[0079] Along the direction from the middle cover toward the base 110, the size of the partition 150 is approximately equal to the size of the receiving cavity 120. This can be understood as the difference between the size of the partition 150 and the size of the receiving cavity 120 being less than or equal to 5 millimeters.

[0080] Along the direction from the middle cover toward the base 110, if the size of the partition 150 is smaller than the size of the receiving cavity 120, an insulating plate may be provided on the side of the middle cover facing the base 110. The position of the insulating plate corresponds to the position of the partition 150. In this case, the insulating plate and the partition 150 cooperate to allow multiple receiving cavities 120 to be spaced apart.

[0081] In this application example, the base 110 and the middle cover cooperate to form a receiving cavity 120, providing an installation carrier for structures such as the electromagnetic shielding sheet 130 and the trip unit 140. When the partition 150 is fixed to the base 110, the opening of the receiving groove 160 on the partition 150 faces the middle cover, and the electromagnetic shielding sheet 130 can be installed in the receiving groove 160. The middle cover can block the opening of the receiving groove 160. Based on this, when the electromagnetic shielding sheet 130 tends to detach from the receiving groove 160, the electromagnetic shielding sheet 130 can impact the middle cover, that is, the middle cover can prevent the electromagnetic shielding sheet 130 from detaching from the receiving groove 160, ensuring the assembly reliability of the electromagnetic shielding sheet 130 and the receiving groove 160, thereby ensuring the assembly reliability of the electromagnetic shielding sheet 130 and the partition 150.

[0082] With the partition plate fixedly connected to the middle cover, the opening of the receiving groove on the partition plate faces the base 110, and the electromagnetic shielding sheet 130 can be installed in the receiving groove. The base 110 can block the opening of the receiving groove. Based on this, when the electromagnetic shielding sheet 130 tends to detach from the receiving groove, the electromagnetic shielding sheet 130 can impact the base 110. That is, the base 110 can prevent the electromagnetic shielding sheet 130 from detaching from the receiving groove, ensuring the assembly reliability of the electromagnetic shielding sheet 130 and the receiving groove, and thus ensuring the assembly reliability of the electromagnetic shielding sheet 130 and the partition plate.

[0083] Based on the circuit breaker 100 provided in the above example, the electromagnetic shielding sheet 130 includes a first portion and a second portion. The first portion extends into the receiving groove 160 and is fixedly connected to the partition 150, while the second portion protrudes out of the receiving groove 160 and cooperates with the middle cover.

[0084] The size of the cross-section of the first part can be the same as or different from the size of the cross-section of the second part.

[0085] The first part is inserted into the receiving groove 160 to achieve the cooperation between the first part and the receiving groove 160.

[0086] The second part can directly abut against the middle cover. Based on the middle cover having an insulating plate, the insulating plate can have a groove-shaped structure corresponding to the receiving groove 160, and the second part can cooperate with the middle cover by inserting into the groove-shaped structure.

[0087] In this example, the first portion extends into the receiving groove 160 and is fixedly connected to the partition 150. The partition 150 is fixedly installed on the base 110, thus the first portion is connected to the base 110. The second portion protrudes from the receiving groove 160 and mates with the middle cover. Since both the first and second portions are part of the electromagnetic shielding sheet 130, the electromagnetic shielding sheet 130 provided in this example can function simultaneously in the base 110 and the middle cover, making the effective area of ​​the electromagnetic shielding sheet 130 for reducing the mutual influence of two adjacent trip units 140 larger, and further reducing the possibility of mutual influence between two adjacent trip units 140.

[0088] For example, Figure 6 This is a schematic diagram illustrating the mating structure of a base and a bottom plate, as an example of this application. Figure 7 for Figure 6 Please refer to the sectional view at the middle BB point. Figure 6 and Figure 7 The housing assembly includes a base 110, a middle cover, and a bottom plate 190 that cooperate with each other. The bottom plate 190 is located on the side of the base 110 away from the middle cover. The base 110 and the middle cover cooperate to form a receiving cavity 120. A partition 150 is fixedly connected to the base 110. The opening of the receiving groove 160 is located away from the base 110. The bottom plate 190 covers the opening of the receiving groove 160.

[0089] The base 110 and the middle cover can be fixedly connected by riveting, snap-fitting, threaded connection or other methods. The bottom plate 190 is located on the side of the base 110 away from the middle cover, and the bottom plate 190 can be connected to the base 110 by riveting, snap-fitting, threaded connection or other methods.

[0090] In this example, the base 110 and the middle cover cooperate to form a receiving cavity 120, providing an installation carrier for structures such as the electromagnetic shielding sheet 130 and the trip unit 140. A partition 150 is fixed to the base 110, and a bottom plate 190 is located on the side of the base 110 away from the middle cover. The opening of the receiving groove 160 on the partition 150 faces the bottom plate 190, allowing the electromagnetic shielding sheet 130 to be installed in the receiving groove 160. The bottom plate 190 can block the opening of the receiving groove 160. Therefore, when the electromagnetic shielding sheet 130 tends to detach from the receiving groove 160, the electromagnetic shielding sheet 130 can impact the bottom plate 190, preventing the electromagnetic shielding sheet 130 from detaching from the receiving groove 160. This ensures the assembly reliability of the electromagnetic shielding sheet 130 and the receiving groove 160, thereby ensuring the assembly reliability of the electromagnetic shielding sheet 130 and the partition 150.

[0091] For example, the circuit breaker 100 includes a connecting piece 180, which is electrically connected to the trip unit 140. The housing assembly is provided with a mounting groove 170, which communicates with the receiving cavity 120. The connecting piece 180 is installed into the mounting groove 170, and the opening of the receiving groove is located on the side of the partition 150 near the mounting groove 170.

[0092] The terminal block 180, together with the trip unit 140 and other internal structures of the circuit breaker 100, forms the internal circuit of the circuit breaker 100. The terminal block 180 can be electrically connected to the power supply line to realize the electrical connection between the internal circuit of the circuit breaker 100 and the power supply line, thereby realizing the electrical connection between the circuit breaker 100 and the power supply line.

[0093] The number of mounting slots 170 is equal to the number of receiving cavities 120, or the number of mounting slots 170 may be greater than the number of receiving cavities 120. This application example does not impose a specific limitation on this.

[0094] When the housing assembly includes mounting cavities, the number of mounting slots 170 may be greater than the number of receiving cavities 120, which are used to mount the conductive parts of the circuit breaker 100.

[0095] Along the direction from the receiving cavity 120 to the mounting groove 170, the length of the partition 150 can be equal to the sum of the dimensions of the receiving cavity 120 and the mounting groove 170, or the length of the partition 150 can be less than the sum of the dimensions of the receiving cavity 120 and the mounting groove 170.

[0096] The opening of the receiving groove can be formed on the side of the partition 150 near the mounting groove 170. Along the direction from the receiving cavity 120 to the mounting groove 170, the length of the partition 150 can be equal to the size of the mounting groove 170, or the length of the partition 150 can be less than the size of the mounting groove 170. This application example does not impose specific limitations on this.

[0097] A protrusion may be provided at the opening of the receiving groove to reduce the possibility of the electromagnetic shielding sheet 130 detaching from the receiving groove.

[0098] A blocking structure can also be installed at the opening of the receiving groove. After the electromagnetic shielding sheet 130 is installed into the receiving groove, the blocking structure can be installed at the opening of the receiving groove to reduce or even prevent the electromagnetic shielding sheet 130 from detaching from the receiving groove.

[0099] In this application example, the mounting groove 170 provided in the housing assembly provides mounting space for the terminal block 180, which enables the circuit breaker 100 to be electrically connected to the power supply line. The mounting groove 170 communicates with the receiving cavity 120, and the opening of the receiving groove on the partition 150 is opened on the side of the partition 150 near the mounting groove 170, so that the partition 150 can extend into the mounting groove 170 from the opening of the receiving groove to achieve the cooperation between the receiving groove and the partition 150.

[0100] Regardless of the orientation of the opening of the receiving groove 160, a first guide surface can be provided at the opening of the receiving groove 160, and the inclination direction of the first guide surface is adapted to the direction in which the electromagnetic shielding sheet 130 is inserted into the receiving groove 160. And / or, the electromagnetic shielding sheet 130 is provided with a second guide surface, and the inclination direction of the second guide surface is adapted to the direction in which the electromagnetic shielding sheet 130 is inserted into the receiving groove 160.

[0101] By providing a first guide surface at the opening of the receiving groove 160, and ensuring that the inclination direction of the first guide surface matches the direction in which the electromagnetic shielding sheet 130 is inserted into the receiving groove 160, the size of the receiving groove 160 gradually decreases along the direction in which the electromagnetic shielding sheet 130 is inserted into the receiving groove 160. Therefore, during the insertion of the electromagnetic shielding sheet 130 into the receiving groove 160, the electromagnetic shielding sheet 130 can first penetrate the largest part of the receiving groove 160, which helps to improve the efficiency of inserting the electromagnetic shielding sheet 130 into the receiving groove 160.

[0102] By providing a second guide surface at the electromagnetic shielding sheet 130, and ensuring that the inclination direction of the second guide surface matches the direction in which the electromagnetic shielding sheet 130 extends into the receiving groove 160, the size of the electromagnetic shielding sheet 130 gradually decreases along the direction in which it is inserted into the receiving groove 160. Therefore, during the insertion of the electromagnetic shielding sheet 130 into the receiving groove 160, the smallest portion of the electromagnetic shielding sheet 130 can be inserted into the receiving groove 160 first, which improves the efficiency of inserting the electromagnetic shielding sheet 130 into the receiving groove 160.

[0103] In this application example, the first guide surface may be provided only at the opening of the receiving groove 160, or the second guide surface may be provided only at the electromagnetic shielding sheet 130, or the first guide surface may be provided at the opening of the receiving groove 160 and the second guide surface may be provided at the electromagnetic shielding sheet 130 at the same time.

[0104] Based on the circuit breaker 100 provided in the example above, please refer to... Figure 2 and Figure 3 The plurality of spaced-apart receiving cavities 120 include a first receiving cavity 121 and a second receiving cavity 122, with a partition 150 between the first receiving cavity 121 and the second receiving cavity 122. An electromagnetic shielding sheet 130 includes a first shielding sheet disposed on the side of the partition 150 facing the first receiving cavity 121. And / or, the electromagnetic shielding sheet 130 includes a second shielding sheet disposed on the side of the partition 150 facing the second receiving cavity 122.

[0105] Multiple first receiving cavities 121 may be provided, and a second receiving cavity 122 may be provided between two adjacent first receiving cavities 121. Alternatively, multiple second receiving cavities 122 may also be provided, and a first receiving cavity 121 may be provided between two adjacent second receiving cavities 122.

[0106] The electromagnetic shielding sheet 130 may include only the first shielding sheet, only the second shielding sheet, or both the first and second shielding sheets.

[0107] The first shielding sheet can be glued to the side of the partition 150 facing the first receiving cavity 121, or the first shielding sheet can be fixedly connected to the side of the partition 150 facing the first receiving cavity 121 by snap-fit ​​or other means.

[0108] The second shielding sheet can be glued to the side of the partition 150 facing the second receiving cavity 122, or the second shielding sheet can be fixedly connected to the side of the partition 150 facing the second receiving cavity 122 by snap-fit ​​or other means.

[0109] In this example, since the partition 150 is located between the first receiving cavity 121 and the second receiving cavity 122, and the first shielding plate located between the partition 150 and the first receiving cavity 121 is positioned between the first receiving cavity 121 and the second receiving cavity 122, the first shielding plate can reduce the possibility of mutual interference between the trip unit 140 located in the first receiving cavity 121 and the trip unit 140 located in the second receiving cavity 122. The second shielding plate plays a similar role to the first shielding plate; for details on the role of the second shielding plate, please refer to the relevant description of the first shielding plate. This example will not elaborate on this aspect.

[0110] Based on the circuit breaker 100 provided in the above example, the circuit breaker 100 further includes a first protective plate, which is disposed on the side of the partition 150 facing the first receiving cavity 121. The first protective plate and the partition 150 are spaced apart, and the first shielding sheet is located between the first protective plate and the partition 150.

[0111] When the electromagnetic shielding sheet 130 includes a second shielding sheet, the circuit breaker 100 also includes a second protective plate. The second protective plate is disposed on the side of the partition 150 facing the second receiving cavity 122. The second protective plate is spaced apart from the partition 150, and the second shielding sheet is located between the second protective plate and the partition 150.

[0112] The first protective plate may be made of insulating material, and the supporting material of the first protective plate is the same as the material used to make the housing assembly.

[0113] The first protective plate can be fixedly connected to the base 110, or it can be fixedly connected to the middle cover. This application example only describes the case where the first protective plate is fixedly connected to the base 110.

[0114] The bottom wall of the base 110 may be provided with a groove structure, and part of the first protective plate may be inserted into the groove structure to achieve a fixed connection between the first protective plate and the base 110. The first protective plate may also be fixedly connected to the base 110 by means of threaded connection or other means.

[0115] When the partition 150 is fixedly connected to the base 110, the first protective plate can be fixedly connected to the partition 150 through a connecting plate, connecting rod or other structure, so as to achieve the fixed connection between the first protective plate and the base 110.

[0116] In this example, the first shielding plate is disposed between the first protective plate and the partition 150, meaning that the partition 150 and the first protective plate cooperate to provide installation space for the first shielding plate. Based on this, since the first protective plate is disposed on the side of the partition 150 facing the first receiving cavity 121, the first protective plate is located on the side of the first shielding plate facing the first receiving cavity 121. During the use of the circuit breaker 100, the first protective plate can provide protection for the first shielding plate, thereby reducing the possibility of damage to the first shielding plate from other structures within the circuit breaker 100.

[0117] The structure of the second protective plate is similar to that of the first protective plate, and it plays a similar role. The example in this application will not be repeated here.

[0118] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circuit breaker characterized by, include: The housing assembly includes a plurality of spaced-apart receiving cavities; A trip unit is installed in the receiving cavity. The number of trip units is equal to the number of receiving cavities, and each trip unit corresponds to a receiving cavity. Adjacent trip units are insulated from each other. An electromagnetic shielding sheet is fixedly installed on the housing assembly, and the electromagnetic shielding sheet is disposed between two adjacent trip units.

2. The circuit breaker of claim 1, wherein, The housing assembly includes a partition disposed between two adjacent receiving cavities, and the electromagnetic shielding sheet is fixedly connected to the partition.

3. The circuit breaker according to claim 2, characterized in that, The partition is provided with a receiving groove, and at least part of the electromagnetic shielding sheet is inserted into the receiving groove so that the electromagnetic shielding sheet is fixedly connected to the partition.

4. The circuit breaker according to claim 3, characterized in that, The housing assembly includes a base and a middle cover that cooperate with each other. The base and the middle cover cooperate to form the receiving cavity. The partition is fixedly connected to the base. The opening of the receiving groove is arranged facing the middle cover. The middle cover covers the opening of the receiving groove. or, The partition is fixedly connected to the middle cover, the opening of the receiving groove faces the base, and the base can cover the opening of the receiving groove.

5. The circuit breaker according to claim 4, characterized in that, The electromagnetic shielding sheet includes a first part and a second part. The first part extends into the receiving groove and is fixedly connected to the partition. The second part protrudes from the receiving groove and cooperates with the middle cover.

6. The circuit breaker according to claim 3, characterized in that, The housing assembly includes a base, a middle cover, and a bottom plate that cooperate with each other. The bottom plate is located on the side of the base away from the middle cover. The base and the middle cover cooperate to form the receiving cavity. The partition is fixedly connected to the base. The opening of the receiving groove is located away from the base. The bottom plate covers the opening of the receiving groove.

7. The circuit breaker of claim 3, wherein, The circuit breaker includes a connecting piece that is electrically connected to the trip unit. The housing assembly is provided with a mounting groove that communicates with the receiving cavity. The connecting piece is installed into the mounting groove, and the opening of the receiving groove is located on the side of the partition near the mounting groove.

8. The circuit breaker of any of claims 3-7, wherein, The receiving groove has a first guide surface at its opening, and the inclination direction of the first guide surface is adapted to the direction in which the electromagnetic shielding sheet is inserted into the receiving groove; and / or, The electromagnetic shielding sheet is provided with a second guide surface, and the inclination direction of the second guide surface is adapted to the direction in which the electromagnetic shielding sheet is inserted into the receiving groove.

9. The circuit breaker of claim 2, wherein, The plurality of spaced-apart receiving cavities include a first receiving cavity and a second receiving cavity, with a partition between the first receiving cavity and the second receiving cavity. The electromagnetic shielding sheet includes a first shielding sheet disposed on the side of the partition facing the first receiving cavity; and / or, The electromagnetic shielding sheet includes a second shielding sheet, which is disposed on the side of the partition facing the second receiving cavity.

10. The circuit breaker according to claim 9, characterized in that, When the electromagnetic shielding sheet includes a first shielding sheet, the circuit breaker further includes a first protective plate, the first protective plate being disposed on the side of the partition facing the first receiving cavity, the first protective plate being spaced apart from the partition, and the first shielding sheet being located between the first protective plate and the partition; When the electromagnetic shielding sheet includes a second shielding sheet, the circuit breaker further includes a second protective plate, the second protective plate being disposed on the side of the partition facing the second receiving cavity, the second protective plate being spaced apart from the partition, and the second shielding sheet being located between the second protective plate and the partition.

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