Limiting structure of moving contact and molded case circuit breaker

Abstract

The utility model relates to the technical field of electrical connection devices, in particular to a limiting structure of a moving contact and a molded case circuit breaker. The utility model provides a limiting structure of a moving contact. The limiting structure comprises a bottom plate, a first limiting plate and a second limiting plate, in the first direction, the first limiting plate and the second limiting plate are oppositely arranged, and the first limiting plate and the second limiting plate are arranged in a spaced mode. And the first limiting plate, the second limiting plate and the bottom plate form a first limiting groove of a moving contact in the molded case circuit breaker. The limiting structure of the moving contact can be installed on the base of the molded case circuit breaker and is used for changing the width of a channel for the moving contact to pass through in the molded case circuit breaker, so that the same base can be suitable for moving contacts of different specifications, the universality of the base is improved, the manufacturing cost is reduced, and the limiting structure of the moving contact is of an integral structure, so that the manufacturing cost is reduced. The limiting device has the characteristics of convenience in use, accurate limiting size and convenience in installation.

Description

Technical Field

[0001] The present application relates to the technical field of electrical connection devices, and particularly to a limiting structure for a moving contact and a molded case circuit breaker. Background Art

[0002] A molded case circuit breaker (MCCB) is a common circuit protection device, widely used in industrial, commercial, and residential electrical systems to control and protect circuits from electrical faults such as overload, short circuit, and undervoltage.

[0003] The basic structural components of a molded case circuit breaker include a base, a moving contact, a static contact, and an operating mechanism. The base generally includes a first installation area and a second installation area. A barrier is provided between the first installation area and the second installation area, and a limiting groove is formed on the barrier. The static contact is located in the first installation area, and the operating mechanism is located in the second installation area. One end of the moving contact provided with a moving contact point is located in the first installation area, and one end of the moving contact connected to the operating mechanism is located in the second installation area. The limiting groove formed on the barrier needs to match the moving contact to play a role in limiting the moving contact, and at the same time prevent the arc generated when the circuit breaker is tripped from entering the second installation area through the limiting groove and damaging the operating mechanism.

[0004] Currently, circuit breakers with different current ratings need to use moving contacts with different thicknesses due to different rated current magnitudes. However, after the same base is manufactured, the limiting grooves formed on the barrier are determined. Therefore, the same base cannot be applied to moving contacts with different thicknesses, and the versatility of the base is poor. Summary of the Utility Model

[0005] The present application provides a limiting structure for a moving contact and a molded case circuit breaker to improve the versatility of the base, enable moving contacts under different rated current specifications to use the same base, and reduce the manufacturing cost of the molded case circuit breaker.

[0006] The technical solution of the present application is as follows:

[0007] The present application provides a limiting structure for a moving contact, which is applied to a molded case circuit breaker. The limiting structure for the moving contact includes a bottom plate, a first limiting plate, and a second limiting plate. Along a first direction, the first limiting plate and the second limiting plate are arranged opposite to each other and are spaced apart. Along a second direction, the bottom plate is located on one side of the first limiting plate and the second limiting plate, and the first limiting plate and the second limiting plate are respectively fixedly connected to the bottom plate. The second direction is perpendicular to the first direction. The first limiting plate, the second limiting plate, and the bottom plate form a first limiting groove for the moving contact in the molded case circuit breaker.

[0008] Through the limiting structure of the moving contact provided by the first aspect, the limiting structure of the moving contact can be installed on the base of the molded case circuit breaker, and is used to change the width of the channel for the moving contact to pass through in the molded case circuit breaker, so that the same base can be applicable to moving contacts of different specifications, improving the versatility of the base and reducing the manufacturing cost. In addition, it can also reduce the damage of the arc to the operating mechanism, and the limiting structure of the moving contact of the present application is an integral structure, which has the characteristics of convenient use, accurate limiting dimensions and easy installation.

[0009] Based on the same inventive concept, the present application also provides a molded case circuit breaker. The molded case circuit breaker includes a base and a limiting structure. The base includes a first installation area and a second installation area arranged along a third direction. A barrier is provided between the first installation area and the second installation area, and a second limiting groove is opened on the barrier. The limiting structure includes a bottom plate, a first limiting plate and a second limiting plate. Along a first direction, the first limiting plate and the second limiting plate are arranged oppositely, and the first limiting plate and the second limiting plate are arranged at intervals. Along a second direction, the bottom plate is located on one side of the first limiting plate and the second limiting plate, and the first limiting plate and the second limiting plate are respectively fixedly connected to the bottom plate, and the second direction is perpendicular to the first direction. The first limiting plate, the second limiting plate and the bottom plate form a first limiting groove for the moving contact in the molded case circuit breaker. The limiting structure is detachably arranged at the second limiting groove. In the first direction, the size of the second limiting groove is larger than the size of the first limiting groove, and the first direction is perpendicular to the third direction.

[0010] The molded case circuit breaker of the present application includes the above-mentioned limiting structure of the moving contact, and thus has all the beneficial effects of the above-mentioned limiting structure of the moving contact, which will not be elaborated here.

[0011] In a possible design, the limiting structure of the moving contact further includes a first positioning plate. Along the third direction, the first positioning plate is located on one side of the bottom plate, and the first positioning plate is connected to the bottom plate, and the second direction and the first direction are both perpendicular to the third direction.

[0012] When the above-mentioned limiting structure of the moving contact is applied to a molded case circuit breaker, the molded case circuit breaker includes a static contact, and the static contact is located in the first installation area. The base includes a substrate, and a boss is provided on the substrate, and the static contact is fixed to the side of the boss away from the substrate. Along the second direction, there is a gap between one end of the static contact close to the barrier and the substrate. The first positioning plate of the limiting structure of the moving contact is located in the gap, and the static contact abuts against the first positioning plate.

[0013] The limiting structure of the moving contact and the molded case circuit breaker provided by this embodiment utilize the gap between the static contact and the substrate. The first positioning plate of the limiting structure of the moving contact is located in this gap and abuts against the static contact. Since the position of the static contact is fixed, in the second direction, the static contact restricts the movement of the first positioning plate, that is, it defines the position of the limiting structure of the moving contact in the second direction. In this way, it is possible to avoid the problem that the limiting structure of the moving contact shifts in position in a vibrating environment and thus cannot limit the moving contact well.

[0014] In a possible design, for the limiting structure of the moving contact, along the second direction, the first positioning plate is located on the side of the bottom plate away from the first limiting plate and the second limiting plate. One end of the first positioning plate and the bottom plate close to each other is connected by a connecting plate.

[0015] When the above-mentioned limiting structure of the moving contact is applied to the molded case circuit breaker, a sealing groove is formed between the connecting plate and the bottom plate. A protrusion adapted to the sealing groove is formed at the bottom of the second limiting groove. The limiting structure is arranged at the second limiting groove through the cooperation of the sealing groove and the protrusion.

[0016] For the limiting structure of the moving contact and the molded case circuit breaker provided by this embodiment, when the limiting structure of the moving contact cooperates with the molded case circuit breaker, the groove formed between the connecting plate and the bottom plate can have a sealing function and can be used as a sealing groove. The limiting structure of the moving contact plays a sealing role through the cooperation of the sealing groove and the protrusion at the bottom of the second limiting groove, and can well block the arc from entering the second installation area, further reducing the damage of the arc to the operating mechanism.

[0017] In a possible design, the thickness of the first positioning plate in the limiting structure of the moving contact is the same as the thickness of the bottom plate.

[0018] For the limiting structure of the moving contact provided by this embodiment, the limiting structure can be manufactured by an injection molding process. If the thickness of the first positioning plate is set to be the same as the thickness of the bottom plate, then during the injection molding process, the shrinkage amount of the first positioning plate is the same as that of the bottom plate. In this way, it helps to manufacture a limiting structure with higher dimensional accuracy, thereby improving the matching accuracy between the limiting structure of the moving contact and the base and realizing the accurate limitation of the moving contact.

[0019] In a possible design, limiting strips extending in the second direction are symmetrically arranged on the sides of the first limiting plate and the second limiting plate in the limiting structure of the moving contact that are away from each other.

[0020] When the above-mentioned limiting structure of the moving contact is applied to the molded case circuit breaker, limiting grooves adapted to the limiting strips are arranged on the two side walls of the second limiting groove along the first direction. Along the second direction, the limiting strips are inserted into the limiting grooves.

[0021] The limiting structure of the moving contact and the molded case circuit breaker provided by this embodiment can achieve positioning in the first direction and the second direction of the limiting structure. In this way, the limiting structure of the present application can achieve positioning in the first direction, the second direction and the third direction in the molded case circuit breaker, which helps to accurately limit the movement of the moving contact and improve the accuracy of the contact or separation between the moving contact and the static contact.

[0022] In a possible design, the cross-section of the limiting strip is rectangular.

[0023] For the limiting structure of the moving contact and the molded case circuit breaker provided by this embodiment, when the limiting strip cooperates with the limiting groove, in the first direction and the third direction, the cooperation between the limiting groove and the limiting strip is a plane contact. In this way, it helps to accurately position in the first direction and the third direction. When there is a problem with the positioning, it is easier to distinguish which direction the positioning problem occurs in. In addition, the limiting strip with a rectangular cross-section cooperates with the rectangular groove to form a labyrinth seal with good sealing effect. In this way, it can further reduce the arc in the first installation area from entering the second installation area and reduce the damage of the arc to the operating mechanism. Description of the Drawings

[0024] Figure 1 The figure shows a schematic structural diagram of a base of a molded case circuit breaker provided by an embodiment of the present application.

[0025] Figure 2 is Figure 1 the partial enlarged view at I in the figure.

[0026] Figure 3 The figure shows a partial structural diagram of a molded case circuit breaker provided by an embodiment of the present application.

[0027] Figure 4 is Figure 3 the partial enlarged view at B in the figure.

[0028] Figure 5 is Figure 3 the sectional view taken along A-A of

[0029] Figure 6 is Figure 5 the partial enlarged view at E in the figure.

[0030] Figure 7 The figure shows a three-dimensional structural diagram of a limiting structure of a moving contact provided by an embodiment of the present application.

[0031] Figure 8 The figure shows a side view of a limiting structure of a moving contact provided by an embodiment of the present application.

[0032] Figure 9The figure shows a top view of a limiting structure for a moving contact provided by an embodiment of the present application.

[0033] Figure 10 The figure shows a schematic structural diagram of the limiting structure for the moving contact provided by the present application when applied to a base.

[0034] Figure 11 is Figure 10 a partial enlarged schematic diagram at position C in

[0035] Among them, the reference numerals are:

[0036] 1. Limiting structure; 11. Bottom plate; 12. First limiting plate; 13. Second limiting plate; 14. First limiting groove; 15. First positioning plate; 16. Connecting plate; 17. Limiting strip; 161. Sealing groove;

[0037] 2. Base; 21. First installation area; 22. Second installation area; 23. Blocking member; 24. Second limiting groove; 241. Protrusion; 242. Limiting groove; 25. Substrate; 26. Boss;

[0038] 3. Static contact; 4. Moving contact; 41. Moving contact point; 5. Operating mechanism; 51. Rotating handle;

[0039] D1. First direction; D2. Second direction; D3. Third direction. Specific embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts shall fall within the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0042] Reference to "embodiment" in this document means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0043] The directional terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the limit structure of this application. For example, in the description of this application, terms such as "width", "thickness", "upper", "lower", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of this application.

[0044] In addition, the terms "first", "second", etc. in the description of this application and the claims or the above drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0045] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a mechanical structure may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts, or other spacers. A physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection. A physical connection may also be an integral connection, such as a connection by welding, bonding, or integrally forming a connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] Figure 1 The figure shows a schematic structural diagram of a base of a molded case circuit breaker provided by an embodiment of this application. Figure 2 is Figure 1 the partial enlarged view at I in Figures 1 to 2 , Figure 1The molded case circuit breaker base shown is used for a three-phase circuit breaker, and the three-phase circuit breaker is used to protect a three-phase power supply system. The base 2 of the molded case circuit breaker is divided into three installation cavities, and each installation cavity is designed to control the circuit on and off of the corresponding phase. Each installation cavity includes a first installation area 21 and a second installation area 22, and a barrier 23 is provided between the first installation area 21 and the second installation area 22, and a second limiting groove 24 for the moving contact 4 to pass through is opened on the barrier 23.

[0047] Figure 3 FIG. 1 is a partial structural diagram of a molded case circuit breaker provided in an embodiment of the present application. Figure 4 for Figure 3 A partial enlarged view of point B in the middle. Figure 5 for Figure 3 AA section diagram, Figure 6 for Figure 5 A partial enlarged view of point E in the middle.

[0048] Please refer to Figures 3 to 6 The molded case circuit breaker includes a base 2, a moving contact 4, a static contact 3 and an operating mechanism 5.

[0049] Please combine Figures 1 to 6 The static contact 3 is located in the first installation area 21, the operating mechanism 5 is located in the second installation area 22, one end of the moving contact 4 is connected to the operating mechanism 5, and the other end of the moving contact 4 is provided with a moving contact 41. One end of the moving contact 4 provided with the moving contact 41 passes through the second limiting groove 24 on the blocking member 23 to contact or separate from the static contact 3 in the first installation area 21.

[0050] Please continue to refer to Figures 3 to 5 In a molded case circuit breaker, the moving contact 4 may deviate from the predetermined rotation path during the closing process due to some reasons, such as: the transmission link gap in the operating mechanism 5 is too large, affecting the precise control of the moving contact 4, causing the moving contact 4 to deviate during the movement. For another example, the moving contact 4 is worn, causing the moving contact 4 to shake too much, thereby affecting the precise positioning of the moving contact 4. For another example, the parts of the operating mechanism 5 are damaged or worn, causing the movement trajectory of the moving contact 4 to change, resulting in deviation.

[0051] Please combine Figure 1 and Figure 2 The second limiting groove 24 provided on the blocking member 23 in the base 2 has the function of preventing the movable contact 4 from deviating from the predetermined rotation path. Specifically, the width of the second limiting groove 24 is determined according to the thickness of the movable contact 4, so that the movable contact 4 has a certain limiting effect during the rotation process of the movable contact 4, so that the movable contact 4 can accurately contact or separate with the static contact 3 along the predetermined rotation path under the control of the operating mechanism 5.

[0052] At present, molded case circuit breakers with different current specifications require moving contacts with different thicknesses due to different rated currents. However, after the same base is manufactured, the second limiting groove formed on the barrier is determined. Therefore, the same base cannot be applied to moving contacts with different thicknesses, and the versatility of the base is poor.

[0053] In view of the above situation, the present application provides a limiting structure 1 for a moving contact 4. Figure 7 The figure shows a three-dimensional structural schematic diagram of a limiting structure for a moving contact provided by an embodiment of the present application. Figure 8 The figure shows a side view of a limiting structure for a moving contact provided by an embodiment of the present application. Figure 9 The figure shows a top view of a limiting structure for a moving contact provided by an embodiment of the present application.

[0054] Please refer to Figures 7 to 9 , the limiting structure of the moving contact of the present application is applied to a molded case circuit breaker. The limiting structure 1 includes a bottom plate 11, a first limiting plate 12, and a second limiting plate 13. Along the first direction D1, the first limiting plate 12 and the second limiting plate 13 are oppositely arranged and spaced apart. Along the second direction D2, the bottom plate 11 is located on one side of the first limiting plate 12 and the second limiting plate 13, and the first limiting plate 12 and the second limiting plate 13 are respectively fixedly connected to the bottom plate 11. The second direction D2 is perpendicular to the first direction D1. The first limiting plate 12, the second limiting plate 13, and the bottom plate 11 form a first limiting groove 14 for the moving contact 4 in the molded case circuit breaker.

[0055] Figure 10 The figure shows a structural schematic diagram of the limiting structure of the moving contact provided by the present application applied to a base. Figure 11 For Figure 10 a partial enlarged schematic diagram at C in

[0056] Please combine Figures 10 to 11 , the limiting structure 1 of the present application can be arranged at the second limiting groove 24 of the base 2 to change the width of the passage for the moving contact 4 to pass through at the barrier 23.

[0057] Specifically, please refer to Figure 2 and Figure 11 , before the limiting structure 1 of the moving contact is arranged on the base 2, the second limiting groove 24 on the base 2 serves as the passage for the moving contact 4 to pass through, and its width in the first direction D1 is W1. When the limiting structure 1 is arranged on the base 2, the width of the passage for the moving contact 4 to pass through on the barrier 23 changes from W1 to W2, where W2 is the width of the first limiting groove 14 along the first direction D1. W2 is less than W1.

[0058] Then, for the same base 2, if the current rating of the molded case circuit breaker is large and a thicker moving contact is required to control the on-off of the current, then there is no need to provide the limiting structure 1 on the base 2, and a thicker moving contact 4 is used. If the current rating of the molded case circuit breaker is small and a thinner moving contact 4 is required to control the on-off of the current, then the limiting structure 1 can be added to the base 2 to adapt to the thinner moving contact 4.

[0059] Based on the above statements, the limiting structure 1 of the moving contact 4 of the present application can be installed on the base 2 of the molded case circuit breaker, and is used to change the width of the channel for the moving contact 4 to pass through in the molded case circuit breaker, so that the same base 2 can be applicable to different specifications of moving contacts 4, improving the versatility of the base 2 and reducing the manufacturing cost.

[0060] In addition, please continue to refer to Figure 3 and Figure 4 , in the molded case circuit breaker, the static contact 3 is located in the first installation area 21, the operating mechanism 5 is located in the second installation area 22, one end of the moving contact 4 is located in the second installation area 22 and is connected to the operating mechanism 5 in the second installation area 22, and the other end of the moving contact 4 is located in the first installation area 21.

[0061] The static contact 3 and the moving contact 4 make contact or separation in the first installation area 21, and an arc will be generated during the contact or separation process. If the width of the second limiting groove 24 for the moving contact 4 to pass through on the barrier 23 is too large, then the arc will enter the second installation area 22 through the gap between the moving contact 4 and the second limiting groove 24, thus damaging the operating mechanism 5.

[0062] The limiting structure 1 of the moving contact 4 provided by the present application can be installed on the base 2 of the molded case circuit breaker, and is used to change the width of the channel for the moving contact 4 to pass through in the molded case circuit breaker. In this way, the width of the channel for the moving contact 4 to pass through in the molded case circuit breaker is adapted to the thickness of the moving contact 4, the gap between the moving contact 4 and the channel is reduced, and the arc can be blocked from entering the second installation area 22, reducing the damage to the operating mechanism by the arc.

[0063] Finally, the limiting structure 1 of the moving contact 4 of the present application is an integral structure, which has the characteristics of convenient use and easy installation. Further, in some embodiments of the present application, the limiting structure 1 can be injection molded as an integral part, and the dimensional accuracy is easy to control, so it also has the characteristic of accurate limiting dimensions.

[0064] Please refer to Figure 3 and Figure 4, Based on the same inventive concept, the present application also provides a molded case circuit breaker, which includes a base 2 and a limiting structure 1. The base 2 includes a first installation area 21 and a second installation area 22 arranged along the third direction D3. A barrier 23 is provided between the first installation area 21 and the second installation area 22, and a second limiting groove 24 is formed on the barrier 23. The limiting structure 1 includes a bottom plate 11, a first limiting plate 12 and a second limiting plate 13. Along the first direction D1, the first limiting plate 12 and the second limiting plate 13 are arranged oppositely and spaced apart. Along the second direction D2, the bottom plate 11 is located on one side of the first limiting plate 12 and the second limiting plate 13, and the first limiting plate 12 and the second limiting plate 13 are respectively fixedly connected to the bottom plate 11. The second direction D2 is perpendicular to the first direction D1. The first limiting plate 12, the second limiting plate 13 and the bottom plate 11 form a first limiting groove 14 for the moving contact 4 in the molded case circuit breaker. The limiting structure 1 is detachably arranged at the second limiting groove 24. In the first direction D1, the size of the second limiting groove 24 is larger than that of the first limiting groove 14, and the first direction D1 is perpendicular to the third direction D3.

[0065] The molded case circuit breaker of the present application includes the above-mentioned limiting structure 1, and thus has all the beneficial effects of the above-mentioned limiting structure 1, which will not be elaborated here.

[0066] It should be noted that Figure 1 , Figure 3 and Figure 10 show the relevant structure of a three-phase molded case circuit breaker, but the limiting structure 1 of the moving contact 4 and the structure of the molded case circuit breaker required to be protected by the present application are not only applicable to three-phase molded case circuit breakers, but also applicable to four-phase molded case circuit breakers, two-phase molded case circuit breakers and single-phase molded case circuit breakers. In this regard, the present application makes no limitation.

[0067] It should also be noted that Figures 7 to 9 shows a specific implementation manner of the limiting structure of the present application, but the limiting structure 1 of the present application is not limited to Figures 7 to 9 the specific structure shown. For example, based on the core idea of the present application, the ends of the first limiting plate 12 and the second limiting plate 13 of the limiting structure 1 away from the bottom plate 11 can also form a guiding port similar to a flared opening. In this regard, the present application makes no limitation.

[0068] Please continue to refer to Figures 7 to 9 , in some embodiments of the present application, the limiting structure 1 of the moving contact 4 further includes a first positioning plate 15. Along the third direction D3, the first positioning plate 15 is located on one side of the bottom plate 11, and the first positioning plate 15 is connected to the bottom plate 11. The second direction D2 and the first direction D1 are both perpendicular to the third direction D3.

[0069] Please combine with Figure 3 ,Figure 4 , Figure 5 and Figure 6 , in some embodiments of the present application, when the limiting structure 1 of the moving contact 4 is applied to a molded case circuit breaker, the molded case circuit breaker includes a static contact 3, and the static contact 3 is located in the first installation area 21. The base 2 includes a base plate 25, and a boss 26 is provided on the base plate 25. The static contact 3 is fixed to the side of the boss 26 away from the base plate 25. Along the second direction D2, there is a gap between one end of the static contact 3 close to the barrier 23 and the base plate 25. The first positioning plate 15 of the limiting structure 1 of the moving contact 4 is located in the gap, and the static contact 3 abuts against the first positioning plate 15.

[0070] Specifically, please continue to refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , in some embodiments of the present application, the main function of the first positioning plate 15 included in the limiting structure 1 of the moving contact 4 is to limit the limiting structure 1 of the moving contact 4 in the second direction D2, so that the position of the limiting structure 1 of the moving contact 4 in the molded case circuit breaker along the second direction D2 is determined, and to prevent the limiting structure 1 of the moving contact 4 from shifting in a vibrating environment, thus failing to limit the moving contact 4 well.

[0071] In some related technologies, for a three-phase molded case circuit breaker, the base is divided into three installation cavities. For each installation cavity, a second limiting groove is provided on the base. For a relatively thin moving contact, a limiting structure is provided at the second limiting groove of each installation cavity. However, the limiting structure is different from that in the present application. Specifically, a baffle is inserted into each of the gaps between the second limiting groove and the two sides of the moving contact along the first direction D1 to reduce the gap. The positioning of the baffle along the second direction D2 depends on the middle cover of the molded case circuit breaker for positioning. Please refer to Figure 3 , for a general three-phase molded case circuit breaker, a rotating handle 51 of the operating mechanism is provided in one of the three installation cavities of the base 2, and a hole for the rotating handle 51 to pass through is reserved on the middle cover. Therefore, for the installation cavity where the rotating handle 51 is installed, the middle cover cannot position the limiting structure 1 of the moving contact 4, resulting in inaccurate limiting in the second direction D2. The limiting structure 1 provided by the present application can well solve this problem.

[0072] Specifically, please continue to refer to Figure 1 , Figure 5 and Figure 6, in a molded case circuit breaker, the base 2 includes a base plate 25, on which a boss 26 is provided, and the static contact 3 is fixed on the boss 26 with a relatively fixed position. Along the third direction D3, one end of the static contact 3 close to the barrier member 23 is in a cantilever state relative to the boss 26. Therefore, along the second direction D2, there is a gap between the static contact 3 and the base plate 25. This embodiment utilizes the gap between the static contact 3 and the base plate 25. The first positioning plate 15 of the limiting structure 1 of the moving contact 4 is located in this gap and abuts against the static contact 3. Since the position of the static contact 3 is fixed, in the second direction D2, the static contact 3 limits the movement of the first positioning plate 15, that is, limits the position of the limiting structure 1 of the moving contact 4 in the second direction D2.

[0073] For the molded case circuit breaker with this structure, during assembly, the limiting structure 1 of the moving contact 4 can be assembled with the base 2 first, and then the static contact 3 is installed, so as to realize the positioning of the limiting structure 1 by the static contact 3.

[0074] In summary, the limiting structure 1 of the moving contact 4 of the present application includes a first positioning plate 15 arranged along the third direction D3. The first limiting plate 12 can be used to limit the limiting structure 1 of the moving contact 4 in the second direction D2, so that the position of the limiting structure 1 of the moving contact 4 in the molded case circuit breaker along the second direction D2 is determined, avoiding the problem that the limiting structure 1 of the moving contact 4 is displaced in a vibrating environment and thus cannot limit the moving contact 4 well.

[0075] In addition, the limiting structure 1 of the moving contact 4 of the present application is relatively simple and effectively utilizes the existing components of the molded case circuit breaker for limiting, which helps to simplify the structure of the molded case circuit breaker.

[0076] The Figures 7 to 9 only shows one form of the limiting structure 1 of the moving contact 4. Based on the core idea of the present application, the limiting structure 1 of the moving contact 4 claimed by the present application can also have other forms. For example, the dimension of the first positioning plate 15 along the first direction D1 is smaller than the dimension of the bottom plate 11 along the first direction D1. Another example is that the first positioning plate 15 can be a semi-circular disk structure.

[0077] Please continue to refer to Figures 7 to 9 , in some embodiments of the present application, for the limiting structure 1 of the moving contact 4, along the second direction D2, the first positioning plate 15 is located on the side of the bottom plate 11 away from the first limiting plate 12 and the second limiting plate 13. One end of the first positioning plate 15 and the bottom plate 11 close to each other is connected by a connecting plate 16.

[0078] Please combine Figure 5 , Figure 6 and Figure 8, in some embodiments of the present application, when the limiting structure 1 of the moving contact 4 is applied to a molded case circuit breaker, a sealing groove 161 is formed between the connecting plate 16 and the bottom plate 11. A protrusion 241 adapted to the sealing groove 161 is formed at the bottom of the second limiting groove 24. The limiting structure 1 is arranged at the second limiting groove 24 through the cooperation of the sealing groove 161 and the protrusion 241.

[0079] Specifically, please refer to Figure 7 and Figure 8 . Along the second direction D2, the first positioning plate 15 is located on the side of the bottom plate 11 away from the first limiting plate 12 and the second limiting plate 13. One end of the first positioning plate 15 and the bottom plate 11 close to each other is connected by the connecting plate 16. Since there is a certain height difference between the first positioning plate 15 and the bottom plate 11 in the second direction D2, and one end of the first positioning plate 15 and the bottom plate 11 close to each other is connected by the connecting plate 16, therefore, a groove of a certain shape, such as a right-angle groove, an arc groove or other shaped grooves, will be formed between the connecting plate 16 and the bottom plate 11. The shape of the groove depends on the shape of the connecting plate 16. When the limiting structure 1 of the moving contact 4 is matched with the molded case circuit breaker, the groove formed between the connecting plate 16 and the bottom plate 11 can have a sealing effect and can be used as the sealing groove 161. Specifically, a protrusion 241 adapted to the sealing groove 161 is formed at the bottom of the second limiting groove 24. The limiting structure 1 of the moving contact 4 plays a sealing role through the cooperation of the sealing groove 161 and the protrusion 241.

[0080] As described above, the position where the moving contact 4 contacts and separates from the static contact 3 is located in the first installation area 21, and an arc will be generated during opening and closing. The limiting structure 1 forms a labyrinth sealing structure through the cooperation of the sealing groove 161 and the protrusion 241. The labyrinth sealing structure can well block the arc from entering the second installation area 22, further reducing the damage of the arc to the operating mechanism 5.

[0081] Please continue to refer to Figures 7 to 8 , in some embodiments of the present application, the thickness of the first positioning plate 15 in the limiting structure 1 of the moving contact 4 is the same as the thickness of the bottom plate 11.

[0082] Specifically, in some embodiments of the present application, the limiting structure 1 of the moving contact 4 can be manufactured by an injection molding process. The thickness of the first positioning plate 15 is set to be the same as the thickness of the bottom plate 11. Then, during the injection molding process, the shrinkage amount of the first positioning plate 15 is the same as the shrinkage amount of the bottom plate 11. In this way, it is helpful to manufacture a limiting structure 1 with higher dimensional accuracy, thereby improving the matching accuracy between the limiting structure 1 of the moving contact 4 and the base 2 and realizing the accurate limitation of the moving contact 4.

[0083] Please continue to refer to Figures 7 to 9, in some embodiments of the present application, on the sides of the first limiting plate 12 and the second limiting plate 13 of the limiting structure 1 of the moving contact 4 that are away from each other, limiting strips 17 extending along the second direction D2 are symmetrically arranged.

[0084] Please refer to Figure 2 , Figure 4 and Figure 11 , in some embodiments of the present application, when the limiting structure 1 of the above-mentioned moving contact 4 is applied to a molded case circuit breaker, limiting grooves 242 adapted to the limiting strips 17 are arranged on the two side walls of the second limiting groove 24 along the first direction D1. Along the second direction D2, the limiting strips 17 are inserted into the limiting grooves 242.

[0085] Specifically, the fixation of the position of the limiting structure 1 of the moving contact 4 in the molded case circuit breaker is very important. If the position of the limiting structure 1 of the moving contact 4 shifts during the use of the molded case circuit breaker, whether it is a position shift in the first direction D1, or a position shift in the second direction D2 and the third direction D3, it will affect the movement path of the moving contact 4, and even cause the moving contact 4 and the static contact 3 to fail to make normal contact or separation.

[0086] As described above, the first positioning plate 15 in the limiting structure 1 limits the position of the limiting structure 1 along the second direction D2. Then, in the present application, limiting strips 17 extending along the second direction D2 are symmetrically arranged on the sides of the first limiting plate 12 and the second limiting plate 13 that are away from each other, and limiting grooves 242 adapted to the limiting strips 17 are arranged on the two side walls of the second limiting groove 24 along the first direction D1. Along the second direction D2, the limiting strips 17 are inserted into the limiting grooves 242. In this way, the positioning of the limiting structure 1 in the first direction D1 and the second direction D2 can be achieved. In this way, when the limiting structure 1 of the present application is applied to a molded case circuit breaker, positioning can be achieved in the first direction D1, the second direction D2 and the third direction D3, which helps to accurately limit the movement of the moving contact 4 and improve the accuracy of the contact or separation between the moving contact 4 and the static contact 3.

[0087] It should be noted that the limiting strips 17 arranged on the sides of the first limiting plate 12 and the second limiting plate 13 that are away from each other do not necessarily have to be symmetric. In some other embodiments of the present application, along the third direction D3, the limiting strips 17 on the sides of the first limiting plate 12 and the second limiting plate 13 that are away from each other can also be arranged staggeredly.

[0088] It should also be noted that in Figure 7 and Figure 8 the structure shown, the limiting strips 17 are at the same height as the first limiting plate 12 and the second limiting plate 13. In some other embodiments of the present application, the height of the limiting strips 17 can be less than the height of the first limiting plate 12 or the second limiting plate 13.

[0089] Please continue to refer to Figure 3 、 Figure 4 、 Figure 7 、 Figure 9 、 Figure 10 and Figure 11 , in some embodiments of the present application, the cross-section of the limiting strip 17 is rectangular.

[0090] Specifically, the cross-section of the limiting strip 17 is parallel to the plane determined by the second direction D2 and the third direction D3. The cross-section of the limiting strip 17 of the present application is rectangular, and accordingly, the limiting grooves 242 formed on both side walls of the second limiting groove 24 along the first direction D1 are also rectangular grooves. In this way, when the limiting strip 17 cooperates with the limiting grooves 242, in the first direction D1 and the third direction D3, the cooperation between the limiting groove and the limiting strip 17 is in plane contact. In this way, it helps to accurately position in the first direction D1 and the third direction D3. When there is a problem with the positioning, it is also easier to distinguish which direction the positioning problem occurs in.

[0091] In addition, the limiting strip 17 with a rectangular cross-section cooperates with the rectangular groove, and a labyrinth seal with a good sealing effect can be formed. In this way, the electric arc in the first installation area 21 entering the second installation area 22 can be further reduced, and the damage to the operating mechanism caused by the electric arc can be reduced.

[0092] It should be noted that, in some other embodiments of the present application, the cross-section of the limiting strip 17 can be other shapes, such as arc-shaped, dovetail-shaped or T-shaped, etc. The present application does not limit this.

[0093] Those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0094] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A moving contact limiting structure, applied to a molded case circuit breaker, characterized in that: The limiting structure includes a bottom plate, a first limiting plate and a second limiting plate; Along the first direction, the first limiting plate and the second limiting plate are arranged opposite to each other, and the first limiting plate and the second limiting plate are arranged at a distance; Along the second direction, the bottom plate is located on one side of the first limiting plate and the second limiting plate, and the first limiting plate and the second limiting plate are fixedly connected to the bottom plate respectively, and the second direction is perpendicular to the first direction; The first limiting plate, the second limiting plate and the bottom plate form a first limiting groove of the moving contact in the molded case circuit breaker.

2. The limiting structure of the moving contact according to claim 1 is characterized in that: Also includes a first positioning plate; Along the third direction, the first positioning plate is located on one side of the bottom plate, the first positioning plate is connected to the bottom plate, and the second direction and the first direction are both perpendicular to the third direction.

3. The limiting structure of the moving contact according to claim 2 is characterized in that: Along the second direction, the first positioning plate is located at a side of the bottom plate away from the first limiting plate and the second limiting plate; The first positioning plate and the bottom plate are connected at one end close to each other via a connecting plate.

4. The movable contact limiting structure according to claim 2 or 3, characterized in that: The thickness of the first positioning plate is the same as the thickness of the bottom plate.

5. The limiting structure of the moving contact according to claim 1, characterized in that: A limiting strip extending along the second direction is symmetrically arranged on one side of the first limiting plate and the second limiting plate which are away from each other.

6. A molded case circuit breaker, characterized in that: include: A base, the base comprising a first installation area and a second installation area arranged along a third direction, a barrier is provided between the first installation area and the second installation area, and a second limiting groove is provided on the barrier; A limiting structure, the limiting structure as claimed in claim 1; the limiting structure is detachably arranged at the second limiting groove; Wherein, in the first direction, the size of the second limiting groove is larger than the size of the first limiting groove, and the first direction is perpendicular to the third direction.

7. The molded case circuit breaker according to claim 6, characterized in that: comprising a stationary contact, the stationary contact being located in the first mounting area; The base comprises a substrate, a boss is arranged on the substrate, and the stationary contact is fixed to a side of the boss away from the substrate; along the second direction, a gap exists between an end of the stationary contact close to the blocking member and the substrate; The limiting structure further includes a first positioning plate, and along the third direction, the first positioning plate is located at one side of the bottom plate, and the first positioning plate is connected to the bottom plate; The first positioning plate is located in the gap, and the static contact abuts against the first positioning plate.

8. The molded case circuit breaker according to claim 7, characterized in that: Along the second direction, the first positioning plate is located at a side of the bottom plate away from the first limiting plate and the second limiting plate; The first positioning plate and the bottom plate are connected at one end close to each other via a connecting plate, and a sealing groove is formed between the connecting plate and the bottom plate; A protrusion matching the sealing groove is formed at the bottom of the second limiting groove; The limiting structure is arranged at the second limiting groove through the cooperation between the sealing groove and the protrusion.

9. The molded case circuit breaker according to any one of claims 6 to 8, characterized in that: A limiting strip extending along the second direction is symmetrically arranged on one side of the first limiting plate and the second limiting plate which are away from each other; The two side walls of the second limiting groove along the first direction are provided with limiting grooves adapted to the limiting strip; Along the second direction, the limiting strip is inserted into the limiting groove.

10. The molded case circuit breaker according to claim 9, characterized in that: The cross section of the limiting strip is rectangular.

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