A limiting structure and a molded case circuit breaker

Abstract

This application provides a limiting structure and a molded case circuit breaker. The limiting structure includes a base and a rotating shaft. The base includes a bottom plate and multiple side plates. The multiple side plates are all disposed on the edge of the bottom plate and extend in a direction perpendicular to the bottom plate, so that the bottom plate and the side plates form a receiving cavity with an opening. A mounting bracket is provided on the bottom plate. The rotating shaft is rotatably connected to the mounting bracket. Limiting grooves are provided on the two side plates arranged along the length direction of the rotating shaft. The limiting groove includes two first groove walls arranged in the radial direction of the rotating shaft. The end of the rotating shaft is embedded in the limiting groove and engaged between the two first groove walls. The limiting groove integrates the limiting function of the rotating shaft into the base, reducing the number of parts and production cost of the molded case circuit breaker. Furthermore, the synergistic effect of the limiting groove and the mounting bracket ensures the rotation of the rotating shaft while providing a reliable positioning function, thereby preventing the rotating shaft from shifting or swinging in the molded case circuit breaker, and thus ensuring the conductivity of the molded case circuit breaker.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a limiting structure and a molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker may include multiple moving contact assemblies, multiple stationary contact assemblies, and a rotating shaft. The rotating shaft drives the multiple moving contact assemblies to rotate, causing the moving contact assemblies to close or open with the stationary contact assemblies, thereby controlling the flow and disconnection of current in the molded case circuit breaker.

[0003] In related technologies, the shaft will shift while rotating, which will affect the contact stability between the moving contact assembly and the stationary contact assembly, and thus affect the conductivity of the molded case circuit breaker. Utility Model Content

[0004] This application provides a limiting structure and a molded case circuit breaker to prevent the shaft from shifting during rotation, thereby ensuring the conductivity of the molded case circuit breaker.

[0005] In a first aspect, this application provides a limiting structure, including a base and a rotating shaft. The base includes a bottom plate and multiple side plates. The side plates are all disposed on the edge of the bottom plate and extend in a direction perpendicular to the bottom plate, such that the bottom plate and side plates form a receiving cavity with an opening. A mounting bracket is provided on the bottom plate. The rotating shaft is rotatably connected to the mounting bracket. Limiting grooves are provided on both side plates arranged along the length direction of the rotating shaft. The limiting groove includes two first groove walls arranged in the radial direction of the rotating shaft. The end of the rotating shaft is embedded in the limiting groove and engaged between the two first groove walls.

[0006] As described in the first aspect, the limiting groove provided in this application embodiment integrates the limiting function of the rotating shaft onto the base, reducing the number of parts and production cost of the molded case circuit breaker. Furthermore, the synergistic effect of the limiting grooves on the two side plates arranged along the length of the rotating shaft and the mounting bracket ensures the rotational freedom of the rotating shaft while providing reliable radial and axial positioning functions, thereby preventing the rotating shaft from shifting or swaying within the molded case circuit breaker, and thus ensuring the conductivity of the molded case circuit breaker.

[0007] In one possible design, the limiting groove is a U-shaped groove. The opening of the U-shaped groove extends towards the opening of the receiving cavity and passes through the top of the side plate. The direction from the bottom to the top of the side plate is the same as the direction from the bottom plate to the opening. There is a first distance between the opening of the U-shaped groove and the bottom plate. There is a second distance between the bottom of the U-shaped groove and the bottom plate. The rotating shaft enters the limiting groove through the opening.

[0008] Based on the description of the above embodiments, the U-shaped limiting groove can limit the rotation of the shaft without affecting its rotation. Furthermore, the opening of the U-shaped groove extends through the top of the side plate, allowing the shaft to easily enter the limiting groove for limiting, thus reducing the assembly and production costs of the molded case circuit breaker.

[0009] In one possible design, the mounting bracket is provided with a rotating groove, which is a U-shaped groove. The opening of the U-shaped groove extends to the top of the mounting bracket. The direction from the bottom to the top of the mounting bracket is the same as the direction from the base plate to the opening. There is a first distance between the opening of the U-shaped groove and the base plate, and a second distance between the bottom of the U-shaped groove and the base plate. The rotating shaft enters the rotating groove through the opening and rotates in the rotating groove.

[0010] Based on the description of the above embodiments, the rotating groove is a U-shaped groove, which enables the rotating shaft to rotate and connect with the mounting bracket. Furthermore, both the rotating groove and the limiting groove are U-shaped grooves, and there is a first distance between the opening of the U-shaped groove and the base plate, and a second distance between the bottom of the groove and the base plate. This allows the rotating shaft to be stably embedded in the rotating groove and the limiting groove, thereby ensuring the stability of the rotating shaft's rotation.

[0011] In one possible design, there is a first gap between the end of the shaft and the first groove wall.

[0012] Based on the description of the above embodiments, the first gap between the end of the rotating shaft and the first groove wall can improve the reliability of the rotating shaft's positioning while allowing the rotating shaft to rotate smoothly.

[0013] In one possible design, the first gap is greater than or equal to 0.2 mm.

[0014] Based on the description of the above embodiments, the first gap is greater than or equal to 0.2 mm, which can prevent rigid contact between the rotating shaft and the first groove wall.

[0015] In one possible design, the first gap is less than or equal to 0.5 mm.

[0016] Based on the description of the above embodiments, the first gap is less than or equal to 0.5mm, which can prevent the limiting function of the limiting groove from failing.

[0017] In one possible design, multiple mounting brackets are provided on the base plate along a first direction. The first direction is the length direction of the rotating shaft.

[0018] Based on the description of the above embodiments, setting multiple mounting brackets along the length of the shaft can prevent the shaft of the multi-pole molded case circuit breaker from swinging or shifting due to excessive length.

[0019] In one possible design, the limiting groove further includes a second groove wall. The second groove wall connects between the two first groove walls. A limiting block is provided on the second groove wall. The bottom of the limiting groove abuts against the bottom of the rotating shaft. The limiting block abuts against the top of the rotating shaft.

[0020] Based on the description of the above embodiments, setting a limiting block on the second groove wall can effectively prevent the rotating shaft from displacing perpendicular to the bottom plate during rotation, and further avoid the rotating shaft from shifting.

[0021] In one possible design, an elastic element can be connected between the limiting block and the second groove wall.

[0022] Based on the description of the above embodiments, connecting an elastic element between the limiting block and the second groove wall can prevent the rotating shaft from displacing perpendicularly to the base plate. Simultaneously, it allows the rotating shaft to be assembled smoothly, reducing the assembly difficulty and thus lowering the assembly and production costs of the molded case circuit breaker.

[0023] Secondly, this application provides a molded case circuit breaker, including a moving contact assembly, a stationary contact assembly, and a limiting structure as described in any of the above embodiments. The moving contact assembly is connected to a rotating shaft. The stationary contact assembly is connected to a base plate. The rotating shaft drives the moving contact assembly to rotate, causing the moving contact assembly and the stationary contact assembly to close or open.

[0024] The beneficial effects of the molded case circuit breaker provided in the second aspect above can be found in the first aspect and the beneficial effects of various possible embodiments of the first aspect, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a molded case circuit breaker in one embodiment of this application.

[0027] Figure 2 This is a schematic diagram of one type of limiting structure in an embodiment of this application.

[0028] Figure 3 for Figure 1 A sectional view.

[0029] Figure 4 This is a schematic diagram of one structure of the rotating shaft in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures: 100-Molded case circuit breaker; 1-Base; 11-Bottom plate; 12-Side plate; 2-Limiting groove; 21-First groove wall; 22-Groove bottom; 23-Second groove wall; 3-Rotating shaft; 31-End; 4-Mounting bracket; 5-Rotating groove; 200 - Moving contact assembly; 300 - Stationary contact assembly; X - First direction; Y - Second direction. Detailed Implementation

[0031] 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.

[0032] 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 of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0034] 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.

[0035] 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 represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the descriptions of directions such as the X direction, Y direction, and Z direction used to explain the operation and construction of the components in this embodiment are not absolute but relative. Although these directions are appropriate when the components are in the positions shown in the figure, they should be interpreted differently when these positions change to correspond to the changes.

[0038] 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.

[0039] 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).

[0040] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; 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. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected; it can also refer to the internal connection of two components. Signal connection can refer not only to signal connection through a circuit but also to signal connection through a media, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] like Figure 1 As shown, the molded case circuit breaker 100 may include multiple moving contact assemblies 200, multiple stationary contact assemblies 300, and a rotating shaft 3. The rotating shaft 3 is used to drive the multiple moving contact assemblies 200 to rotate, so that the moving contact assemblies 200 and the stationary contact assemblies 300 are closed or opened, thereby controlling the flow and disconnection of current in the molded case circuit breaker 100.

[0042] The moving contact assembly 200 refers to a conductive component that contacts or separates from the stationary contact assembly 300 by rotating the shaft 3. Its shape matches the contact surface of the stationary contact assembly 300, and it is used to form a current path in the molded case circuit breaker 100 when the shaft 3 rotates.

[0043] Among them, the stationary contact assembly 300 refers to the conductive component that is fixed on the base 1 of the molded case circuit breaker 100 and cooperates with the moving contact assembly 200. Its position corresponds to the rotation trajectory of the moving contact assembly 200 and is used to provide a stable current path in the closed state.

[0044] Among them, the rotating shaft 3 refers to the shaft that carries the moving contact assembly 200 and realizes the rotational motion.

[0045] In related technologies, the rotating shaft 3 will deflect while rotating, thereby affecting the contact stability between the moving contact assembly 200 and the stationary contact assembly 300, and thus affecting the conductivity of the molded case circuit breaker 100.

[0046] Based on this, this application provides a limiting structure and a molded case circuit breaker 100. The limiting groove 2 provided on the base 1 limits the rotation of the shaft 3, preventing the shaft 3 from shifting during rotation, thereby ensuring the conductivity of the molded case circuit breaker 100. The following is in conjunction with... Figure 2-4 Please provide a detailed explanation.

[0047] In a first aspect, this application provides a limiting structure, including a base 1 and a rotating shaft 3. The base 1 includes a bottom plate 11 and a plurality of side plates 12. The plurality of side plates 12 are all disposed on the edge of the bottom plate 11 and extend in a direction perpendicular to the bottom plate 11, so that the bottom plate 11 and the side plates 12 form a receiving cavity with an opening. A mounting bracket 4 is disposed on the bottom plate 11. The rotating shaft 3 is rotatably connected to the mounting bracket 4. Limiting grooves 2 are provided on the two side plates 12 arranged along the length direction of the rotating shaft 3. The limiting groove 2 includes two first groove walls 21 arranged in the radial direction of the rotating shaft 3. The end 31 of the rotating shaft 3 is embedded in the limiting groove 2 and engaged between the two first groove walls 21.

[0048] Among them, such as Figure 2As shown, the base plate 11 refers to the planar base that supports the internal components of the molded case circuit breaker 100 and can serve as the load-bearing foundation for the entire molded case circuit breaker 100. The side plate 12 refers to the vertical plate extending perpendicularly to the base plate 11, which is usually integrally formed with the base plate 11 and forms a receiving cavity with the base plate 11, so that the components in the molded case circuit breaker 100 are placed in the receiving cavity.

[0049] Among them, such as Figure 2 As shown, the mounting bracket 4 refers to the support component set on the base plate 11, which is used to provide a rotation fulcrum for the rotating shaft 3.

[0050] Among them, such as Figure 2 As shown, the limiting groove 2 refers to the groove structure formed on the side plate 12, which can be U-shaped or rectangular groove design, used to constrain the radial displacement of the end 31 of the rotating shaft 3. Specifically, the limiting groove 2 includes two first groove walls 21 arranged along the radial direction of the rotating shaft 3. When the rotating shaft 3 is embedded in the limiting groove 2, the two first groove walls 21 abut against the rotating shaft 3 in the radial direction, preventing the rotating shaft 3 from shifting radially.

[0051] Specifically, when the shaft 3 rotates under force, the mounting bracket 4 provides the main support, while the limiting groove 2 restricts its radial displacement through the contact between the first groove wall 21 and the end 31 of the shaft 3. The perpendicular relationship between the side plate 12 and the bottom plate 11 ensures that the opening direction of the limiting groove 2 is perpendicular to the axis of the shaft 3, thereby effectively constraining the axial displacement of the shaft 3.

[0052] Furthermore, such as Figure 2 and Figure 3 As shown, limiting grooves 2 can be provided on both side plates 12 arranged along the length of the rotating shaft 3. That is, both ends of the rotating shaft 3 can be engaged in the limiting grooves 2, so that both ends of the rotating shaft 3 are positioned at two points through the two limiting grooves 2 respectively, thus eliminating the swaying phenomenon of the rotating shaft 3 in the multi-pole molded case circuit breaker 100 caused by excessive length. Specifically, the length direction of the rotating shaft 3 can be... Figure 3 The first direction X in the equation.

[0053] In related technologies, the rotating shaft 3 is limited by a support component set on the base 1, which requires the additional assembly of multiple parts. However, this solution integrates the limiting function into the side plate 12 of the base 1, reducing the number of parts and lowering the production cost of the molded case circuit breaker 100.

[0054] According to the description of the first aspect, the limiting groove 2 provided in this application embodiment integrates the limiting function of the rotating shaft 3 onto the base 1, reducing the number of parts and production cost of the molded case circuit breaker 100. Furthermore, the synergistic effect of the limiting groove 2 provided on the two side plates 12 arranged along the length direction of the rotating shaft 3 and the mounting bracket 4 ensures the rotational freedom of the rotating shaft 3 while providing reliable radial and axial positioning functions, thereby preventing the rotating shaft 3 from shifting or swaying within the molded case circuit breaker 100, and thus ensuring the conductivity of the molded case circuit breaker 100.

[0055] Furthermore, in some embodiments, such as Figure 2 As shown, the limiting groove 2 is a U-shaped groove. The opening of the U-shaped groove extends towards the opening of the receiving cavity and passes through the top of the side plate 12. The direction from the bottom to the top of the side plate 12 is the same as the direction from the bottom plate 11 to the opening. There is a first distance between the opening of the U-shaped groove and the bottom plate 11. There is a second distance between the bottom 22 of the U-shaped groove and the bottom plate 11. The rotating shaft 3 enters the limiting groove 2 through the opening.

[0056] The U-shaped groove refers to a groove structure with a U-shaped cross-section, which can be formed on the side plate 12 by stamping. The groove extends towards the opening of the receiving cavity and penetrates the top of the side plate 12 to guide the rotating shaft 3 into the limiting groove 2 along the groove. Specifically, the side plate 12 may include a bottom connected to the bottom plate 11 and a top that is symmetrically arranged with respect to the bottom along the height direction.

[0057] The first distance refers to the vertical distance between the edge of the groove and the base plate 11, which is used to reflect the position reference of the limiting groove 2 in the height direction of the side plate 12.

[0058] The second distance refers to the vertical distance between the lowest point of the groove bottom 22 and the base plate 11, which is used to limit the maximum range of motion of the rotating shaft 3 in the vertical direction. Specifically, when the first distance is determined, the depth of the limiting groove 2 can be controlled by controlling the value of the second distance. That is to say, when the first distance is determined, the second distance can be used to reflect the dimension of the limiting groove 2 in the height direction of the side plate 12.

[0059] In related technologies, the rotating shaft 3 is connected to the support through a connector, which requires additional assembly steps and multiple additional parts. However, in this solution, the rotating shaft 3 can directly enter the limiting slot 2 through the slot to achieve limiting, which reduces the assembly steps and the number of parts of the rotating shaft 3, and reduces the production cost of the molded case circuit breaker 100.

[0060] Furthermore, since the bottom of the U-shaped groove is an arc-shaped groove, the shape of the arc-shaped groove matches the outer diameter shape of the cylindrical rotating shaft 3, allowing the rotating shaft 3 to rotate within the limiting groove 2.

[0061] According to the description of the above embodiments, the limiting groove 2 is a U-shaped groove that can limit the rotation of the shaft 3 without affecting its rotation. Furthermore, the opening of the U-shaped groove extends through the top of the side plate 12, which allows the shaft 3 to easily enter the limiting groove 2 for limiting, thereby reducing the assembly and production costs of the molded case circuit breaker 100.

[0062] Correspondingly, such as Figure 2 As shown, in some embodiments, the mounting bracket 4 is provided with a rotating groove 5, which is a U-shaped groove. The opening of the U-shaped groove extends to the top of the mounting bracket 4. The direction from the bottom to the top of the mounting bracket 4 is the same as the direction from the bottom plate 11 to the opening. There is a first distance between the opening of the U-shaped groove and the bottom plate 11, and a second distance between the bottom 22 of the U-shaped groove and the bottom plate 11. The rotating shaft 3 enters the rotating groove 5 through the opening and rotates in the rotating groove 5.

[0063] The rotating groove 5 refers to a structure on the mounting bracket 4 designed to accommodate the rotation of the rotating shaft 3. Specifically, it can be formed by stamping or milling a U-shaped groove on the metal bracket. The groove extends towards the opening of the receiving cavity and penetrates the top of the mounting bracket 4, guiding the rotating shaft 3 along the groove into the rotating groove 5. Specifically, the mounting bracket 4 may include a bottom connected to the base plate 11 and a top symmetrically arranged along the height direction with respect to the bottom.

[0064] The first distance refers to the vertical distance between the edge of the slot and the base plate 11, which is used to reflect the position reference of the rotating slot 5 in the height direction of the mounting bracket 4.

[0065] The second distance refers to the vertical distance between the lowest point of the groove bottom and the base plate 11, which is used to limit the maximum range of motion of the rotating shaft 3 in the vertical direction. Specifically, when the first distance is determined, the depth of the rotating groove 5 can be controlled by controlling the value of the second distance. That is to say, when the first distance is determined, the second distance can be used to reflect the dimension of the rotating groove 5 in the height direction of the mounting bracket 4.

[0066] As can be seen from the foregoing, the first distance can simultaneously reflect the positional reference of the rotating groove 5 in the height direction of the mounting bracket 4 and the positional reference of the limiting groove 2 in the height direction of the side plate 12. For example... Figure 2 As shown, the height direction of the mounting bracket 4 is the same as the height direction of the side plate 12, and both can be represented by the height direction of the base 1. That is, the position reference of the rotating groove 5 and the limiting groove 2 in the height direction of the base 1 is the same. Specifically, the height direction can be represented as follows: Figure 2 The second direction Y is shown.

[0067] Similarly, the second distance can simultaneously reflect the dimensions of the rotating groove 5 in the height direction of the mounting bracket 4 and the dimensions of the limiting groove 2 in the height direction of the side plate 12. That is to say, the dimensions of the rotating groove 5 and the limiting groove 2 in the height direction of the base 1 are the same.

[0068] In summary, the rotating groove 5 and the limiting groove 2 have the same position reference and the same size in the height direction of the base 1, so that the rotating shaft 3 can be stably embedded in the rotating groove 5 and the limiting groove 2, thereby ensuring the stability of the rotation of the rotating shaft 3.

[0069] Furthermore, since the bottom of the U-shaped groove is an arc-shaped groove, the shape of the arc-shaped groove matches the outer diameter shape of the cylindrical rotating shaft 3, allowing the rotating shaft 3 to rotate within the rotating groove 5.

[0070] According to the description of the above embodiment, the rotating groove 5 is a U-shaped groove that enables the rotating shaft 3 to be rotatably connected to the mounting bracket 4. Furthermore, both the rotating groove 5 and the limiting groove 2 are U-shaped grooves, and there is a first distance between the opening of the U-shaped groove and the base plate 11, and a second distance between the bottom 22 of the groove and the base plate 11. This allows the rotating shaft 3 to be stably embedded in the rotating groove 5 and the limiting groove 2, thereby ensuring the stability of the rotation of the rotating shaft 3.

[0071] Furthermore, in some embodiments, such as Figure 3 and Figure 4 As shown, there is a first gap between the end 31 of the rotating shaft 3 and the first groove wall 21.

[0072] The first gap refers to the non-contact space formed between the outer surface of the end 31 of the rotating shaft 3 and the first groove wall 21. Specifically, it can be achieved by controlling the dimensional tolerance between the diameter of the end 31 of the rotating shaft 3 and the inner diameter of the limiting groove 2. This gap can prevent rigid contact between the rotating shaft 3 and the groove wall during rotation, extend the service life of the rotating shaft 3 and the limiting structure, and reduce the probability of limiting failure of the rotating shaft 3.

[0073] Furthermore, the presence of the first gap can reduce the frictional damping between the rotating shaft 3 and the first groove wall 21, thus preventing the rotating shaft 3 from jamming during rotation.

[0074] According to the description of the above embodiments, the first gap between the end 31 of the rotating shaft 3 and the first groove wall 21 can improve the positioning reliability of the rotating shaft 3 while allowing the rotating shaft 3 to rotate smoothly.

[0075] Furthermore, in some embodiments, the first gap is greater than or equal to 0.2 mm.

[0076] The lower limit of the first gap is limited to 0.2mm. The gap after assembly can be verified by a precision measuring tool. This lower limit is set to avoid rigid contact between the rotating shaft 3 and the first groove wall 21 due to the gap being too small.

[0077] According to the description of the above embodiments, the first gap is greater than or equal to 0.2mm, which can prevent rigid contact between the rotating shaft 3 and the first groove wall 21.

[0078] Furthermore, in some embodiments, the first gap is less than or equal to 0.5 mm.

[0079] The determination of the upper limit of the first gap is based on the thermal expansion coefficient of the material of the shaft 3 and the assembly tolerance range. The critical value that can both avoid the shaft 3 from jamming and suppress the shaft 3 from shifting is obtained through experimental verification.

[0080] According to the description of the above embodiments, the first gap is less than or equal to 0.5mm, which can prevent the limiting function of the limiting groove 2 from failing.

[0081] In some embodiments, a plurality of mounting brackets 4 are provided on the base plate 11 along a first direction X. The first direction X is the length direction of the rotating shaft 3.

[0082] Among them, such as Figure 1 As shown, the first direction X refers to the axial extension direction of the rotating shaft 3, which is used to define the arrangement reference of the mounting brackets 4. The mounting bracket 4 is a support structure used to support the rotating shaft 3 and allow it to rotate. Specifically, it can be implemented by a metal sheet or injection molded part with a U-shaped rotation groove 5. Multiple mounting brackets 4 are distributed at intervals along the length of the rotating shaft 3 to form multi-point support for the rotating shaft 3.

[0083] Specifically, multiple mounting brackets 4 are arranged sequentially along the axial direction of the rotating shaft 3, enabling each mounting bracket 4 to independently bear the rotational load of a local area of ​​the rotating shaft 3. When the rotating shaft 3 rotates, each mounting bracket 4 provides synchronous support, distributing the torsional force on the rotating shaft 3 along its length to each support point. Due to the increased number of support points, the difference in force between the left and right sides caused by the excessive length of the rotating shaft 3 during rotation is uniformized, thereby suppressing the sway amplitude of the rotating shaft 3 and preventing misalignment of the moving contact assembly 200 due to the offset of the rotating shaft 3. This ensures that multiple sets of moving contact assemblies 200 maintain a synchronous motion trajectory under the drive of the rotating shaft 3, ensuring precise alignment of the contact surfaces of each set of moving and stationary contacts and improving contact reliability.

[0084] According to the description of the above embodiments, providing multiple mounting brackets 4 along the length of the shaft 3 can prevent the shaft 3 of the multi-pole molded case circuit breaker 100 from swinging or shifting due to excessive length.

[0085] Furthermore, multiple mounting brackets 4 can adopt a standardized structure, which can achieve stable support of the rotating shaft 3 without the need for a complex limiting mechanism, thus simplifying the assembly process of the molded case circuit breaker 100.

[0086] Furthermore, in some embodiments, such as Figure 2 As shown, the limiting groove 2 also includes a second groove wall 23. The second groove wall 23 is connected between the two first groove walls 21. A limiting block is provided on the second groove wall 23. The bottom 22 of the limiting groove 2 abuts against the bottom of the rotating shaft 3. The limiting block abuts against the top of the rotating shaft 3.

[0087] The limiting block can be a protruding structure provided on the second groove wall 23 of the limiting groove 2. Specifically, it can be a metal block or a plastic block integrally formed with the second groove wall 23, used to limit the upward movement of the rotating shaft 3 along the axial direction. Specifically, the upward movement in this application refers to the movement from the base plate 11 toward the opening.

[0088] In this context, the bottom 22 of the limiting groove 2 abuts against the bottom of the rotating shaft 3, meaning that the arc surface of the bottom 22 of the groove directly contacts the outer surface of the end 31 of the rotating shaft 3, which is used to restrict the rotating shaft 3 from moving downward along the axial direction. Specifically, the downward movement in this application refers to movement from the opening toward the base plate 11.

[0089] Specifically, the end 31 of the rotating shaft 3 is restricted between the bottom 22 of the limiting groove 2 and the limiting block. When the rotating shaft 3 rotates, its end 31 always remains in contact with the bottom 22 of the groove, while the top is blocked by the limiting block. This bidirectional constraint prevents the rotating shaft 3 from displacing in the direction perpendicular to the base plate 11, thereby avoiding misalignment of the contact surfaces of the moving and stationary contacts due to the up-and-down movement of the rotating shaft 3.

[0090] Furthermore, the limit block can be directly integrated into the groove wall of the limit groove 2 without the need for additional independent support components, which reduces assembly steps and the number of parts, lowers the production cost of the molded case circuit breaker 100, and improves assembly efficiency.

[0091] According to the description of the above embodiment, setting a limiting block on the second groove wall 23 can effectively prevent the rotating shaft 3 from displacing perpendicular to the bottom plate 11 during rotation, and further avoid the rotating shaft 3 from deflecting.

[0092] Furthermore, in some embodiments, an elastic element may be connected between the limiting block and the second groove wall 23.

[0093] The elastic element refers to a connecting component with elastic deformation capability, which can be implemented using a helical spring, disc spring, or rubber elastomer. Its function is to provide axial displacement space for the limiting block on the rotating shaft 3. The connection between the limiting block and the second groove wall 23 refers to a non-rigid contact relationship established through the elastic element. Specifically, this can be achieved by having both ends of the spring respectively engaged in the positioning holes of the limiting block and the second groove wall 23. Its function is to allow the limiting block to move while maintaining the axial constraint function of the limiting block.

[0094] Specifically, as the rotating shaft 3 enters the limiting groove 2 from the groove opening and moves towards the bottom of the groove 22, the end 31 of the rotating shaft 3 abuts against the limiting block. The force applied by the rotating shaft 3 to the limiting block causes the elastic element connected to the limiting block to be compressed and deformed, which drives the limiting block to move towards the second groove wall 23, so that the rotating shaft 3 can smoothly reach the bottom of the groove 22 and complete the assembly of the rotating shaft 3.

[0095] When the rotating shaft 3 reaches the bottom of the groove 22, the elastic element returns to its initial state, causing the limiting block to move away from the second groove wall 23, so that the limiting block can abut against the top of the rotating shaft 3.

[0096] In some specific embodiments, the elastic element can be configured as a compression spring. The groove wall can be provided with a guide groove structure, for example, a groove matching the diameter of the spring is opened in the second groove wall 23 to constrain the deformation direction of the spring.

[0097] As described in the above embodiments, connecting an elastic element between the limiting block and the second groove wall 23 can prevent the rotating shaft 3 from displacing perpendicularly to the base plate 11. Simultaneously, it allows the rotating shaft 3 to be smoothly assembled, reducing the assembly difficulty of the rotating shaft 3, thereby reducing the assembly and production costs of the molded case circuit breaker 100.

[0098] Secondly, this application provides a molded case circuit breaker, including a moving contact assembly, a stationary contact assembly, and a limiting structure as described in any of the above embodiments. The moving contact assembly is connected to a rotating shaft. The stationary contact assembly is connected to a base plate. The rotating shaft drives the moving contact assembly to rotate, causing the moving contact assembly and the stationary contact assembly to close or open.

[0099] 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.

[0100] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A limiting structure applied to a molded case circuit breaker, characterized in that, include: Base and pivot; The base includes a bottom plate and multiple side plates; The plurality of side plates are disposed on the edge of the base plate and extend in a direction perpendicular to the base plate, so that the base plate and the side plates form a receiving cavity with an opening; The base plate is provided with a mounting bracket; The rotating shaft is rotatably connected to the mounting bracket; Limiting grooves are provided on both side plates arranged along the length of the rotating shaft. The limiting groove includes two first groove walls arranged in the radial direction along the rotating shaft; The end of the rotating shaft is embedded in the limiting groove and engaged between the two first groove walls.

2. The limiting structure according to claim 1, characterized in that, The limiting groove is a U-shaped groove; The opening of the U-shaped groove extends toward the opening of the receiving cavity and penetrates through the top of the side plate; Wherein, the direction from the bottom to the top of the side plate is the same as the direction from the bottom plate to the opening; There is a first distance between the opening of the U-shaped groove and the bottom plate; There is a second distance between the bottom of the U-shaped groove and the base plate; The rotating shaft enters the limiting groove through the slot.

3. The limiting structure according to claim 1, characterized in that, The mounting bracket is provided with a rotating groove; The rotating groove is a U-shaped groove; The opening of the U-shaped groove extends to the top of the mounting bracket; Wherein, the direction from the bottom to the top of the mounting bracket is the direction from the base plate to the opening; There is a first distance between the opening of the U-shaped groove and the bottom plate; There is a second distance between the bottom of the U-shaped groove and the base plate; The rotating shaft enters the rotating groove through the slot and rotates in the rotating groove.

4. The limiting structure according to claim 2, wherein There is a first gap between the end of the rotating shaft and the first groove wall.

5. The limiting structure according to claim 4, wherein The first gap is greater than or equal to 0.2 mm.

6. The limiting structure according to claim 5, characterized in that, The first gap is less than or equal to 0.5 mm.

7. The limiting structure according to any one of claims 1-6, wherein, Multiple mounting brackets are provided on the base plate along the first direction; The first direction is the length direction of the rotating shaft.

8. The limiting structure according to any one of claims 1-6, wherein, The limiting groove also includes a second groove wall; The second tank wall is connected between the two first tank walls; Limiting blocks are provided on the second groove wall; The bottom of the limiting groove abuts against the bottom of the rotating shaft; The limiting block abuts against the top of the rotating shaft.

9. The limiting structure according to claim 8, characterized in that, An elastic element connects the limiting block to the second groove wall.

10. A molded case circuit breaker characterized by, Includes a moving contact assembly, a stationary contact assembly, and a limiting structure as described in any one of claims 1-9; The moving contact assembly is connected to the rotating shaft; The stationary contact assembly is connected to the base plate; The rotating shaft drives the moving contact assembly to rotate, causing the moving contact assembly and the stationary contact assembly to close or open.

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