Molded case circuit breaker

Abstract

The utility model provides a molded case circuit breaker, and relates to the technical field of electrical equipment. The molded case circuit breaker comprises a shell, an operating mechanism, a draw bar and an insulating baffle. Partition plates are arranged in the shell and divide the internal space of the shell into a plurality of phase chambers, and slotted holes are formed in the partition plates in the first direction. The operating mechanism part is positioned in the phase chamber; the traction rod is connected with the operating mechanism and penetrates through the partition plate from the slotted hole, a gap is formed between the traction rod and the hole wall of the slotted hole, and the gap is communicated with the phase chambers; the insulating baffle plate is connected with the separator plate, the operating mechanism and the draw bar. Wherein the insulation baffle is arranged on the partition plate, the gaps are shielded through the insulation baffle, the possibility that metal objects and electric arcs generated in one phase chamber enter other phase chambers through the gaps can be reduced, electrical isolation of the multiple phase chambers can be achieved conveniently, the possibility that the multiple phase chambers influence one another can be reduced, and the use performance of the molded case circuit breaker is improved.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and particularly to a molded case circuit breaker. Background Art

[0002] A molded case circuit breaker is a commonly used protective electrical appliance, which has the functions of switching on and off the load current and protecting the load current from overload and short circuit. It is widely used in various power distribution systems and for the overload and short circuit protection of motors. The molded case circuit breaker includes a traction rod and an operating mechanism that cooperate with each other. Its housing contains multiple phase chambers, and protection mechanisms that cooperate with the traction rod are respectively arranged in the multiple phase chambers. When a short circuit or overload fault occurs in the system, the protection mechanism acts, driving the traction rod to flip, so that the traction rod drives the operating mechanism to act, causing the molded case circuit breaker to trip and realizing the cutting off of the circuit to prevent the expansion of the fault.

[0003] However, in the related art, it is easy for the multiple phase chambers in the existing molded case circuit breaker to affect each other, which affects the use performance of the molded case circuit breaker. Summary of the Utility Model

[0004] This application provides a molded case circuit breaker, which can reduce the possibility of mutual influence between multiple phase chambers, thereby reducing the influence on the use performance of the molded case circuit breaker.

[0005] An embodiment of this application provides a molded case circuit breaker, including a housing, an operating mechanism, a traction rod, and an insulating baffle.

[0006] A partition is arranged inside the housing, and the partition divides the internal space of the housing into multiple phase chambers. The partition is provided with a slot hole along a first direction.

[0007] Part of the operating mechanism is located in the phase chamber.

[0008] The traction rod is connected to the operating mechanism and passes through the partition from the slot hole. There is a gap between the traction rod and the hole wall of the slot hole, and the gap communicates with the multiple phase chambers.

[0009] The insulating baffle is respectively connected to the partition, the operating mechanism, and the traction rod. The insulating baffle is used to block the gap to achieve electrical isolation of the multiple phase chambers.

[0010] Through the above solution, an insulating baffle is provided on the partition board, and the insulating baffle is also connected to the traction rod, so as to block the gap through the insulating baffle, which can reduce the possibility that metal objects and electric arcs generated in one phase chamber enter other phase chambers through the gap, facilitating the electrical isolation of multiple phase chambers, thereby reducing the possibility of mutual influence between multiple phase chambers and improving the service performance of the molded case circuit breaker. In addition, by connecting the insulating baffle to the operating mechanism, the installation stability of the insulating baffle can be improved, ensuring that the insulating baffle will not loosen or shift during the long-term use and multiple opening and closing operations of the molded case circuit breaker, thus ensuring the stability and durability of the molded case circuit breaker during use.

[0011] In some embodiments, the insulating baffle includes a baffle plate and a limiting plate, and the limiting plate is arranged on the baffle plate along the first direction.

[0012] Both the partition board and the traction rod are connected to the baffle plate, and the baffle plate is used to block the gap.

[0013] Both the partition board and the operating mechanism are connected to the limiting plate, and the limiting plate is used to limit the baffle plate and the operating mechanism.

[0014] Through the above solution, the insulating baffle includes a baffle plate and a limiting plate arranged on the baffle plate along the first direction. By connecting the baffle plate to the first partition board and the traction rod, the gap between the traction rod and the slot can be effectively blocked, preventing metal objects and electric arcs from being conducted from one phase chamber to other phase chambers during the operation of the molded case circuit breaker, realizing the electrical isolation between multiple phase chambers; by connecting the limiting plate to the first partition board and the operating mechanism, the stability of the insulating baffle is further enhanced, avoiding the displacement or deformation of the insulating baffle during the operation of the molded case circuit breaker, ensuring the durability of the electrical isolation, as well as the safety and reliability of the operation of the molded case circuit breaker.

[0015] In some embodiments, the baffle plate includes a first plate, a second plate, and a third plate arranged along the first direction, and the first plate, the second plate, and the third plate are sequentially connected along the second direction, and the second direction is perpendicular to the first direction.

[0016] The first plate is parallel to the third plate, the top surface of the first plate is lower than the bottom surface of the third plate, the bottom surface of the second plate is connected to the top surface of the first plate, and the top surface of the second plate is connected to the bottom surface of the third plate.

[0017] Through the above solution, a baffle is formed by combining the first plate, the second plate and the third plate, which can achieve multi-level electrical isolation and shielding effects. The height and position design of the first plate, the second plate and the third plate ensure the comprehensive isolation between each phase chamber, effectively preventing metal objects and electric arcs from crossing the phase chamber, and ensuring the safety performance of the molded case circuit breaker. At the same time, by combining the first plate, the second plate and the third plate to form a baffle, the physical strength and durability of the baffle are also enhanced, ensuring that the molded case circuit breaker can maintain stability for a long time during operation.

[0018] In some embodiments, the first plate has a first plate surface and a second plate surface along the first direction, and the second plate surface abuts against the first limiting surface of the partition plate.

[0019] The plate surface of the second plate facing the partition plate abuts against the second limiting surface of the partition plate.

[0020] The bottom surface of the third plate partially abuts against the third limiting surface of the partition plate. An installation hole is provided on the third plate, the traction rod passes through the installation hole, and the hole wall of the installation hole abuts against the side wall of the traction rod.

[0021] Through the above solution, through the first plate and the second plate, the baffle can be stably installed on the first partition plate and will not shift due to the operation or movement of the molded case circuit breaker; the baffle can completely block the gap between the traction rod and the slot hole, so that the high-temperature metal objects and electric arcs generated in a certain phase chamber must bypass the baffle before they may enter the gap, increasing the difficulty for the metal objects and electric arcs to enter the gap and improving the effect of the baffle in blocking the gap.

[0022] In some embodiments, the limiting plate includes a first limiting portion, a second limiting portion and a third limiting portion.

[0023] The first limiting portion is arranged on the baffle along the first direction, the second limiting portion and the third limiting portion are both arranged on the first limiting portion along the first direction, and the second limiting portion is connected to the third limiting portion.

[0024] The first limiting portion is connected to the partition plate, and the second limiting portion and the third limiting portion are both connected to the operating mechanism.

[0025] Through the above solution, a limiting plate is formed by combining the first limiting portion, the second limiting portion and the third limiting portion. The first limiting portion is connected to the first partition plate and the third plate of the baffle, ensuring the installation stability of the insulating baffle on the first partition plate. The connection of the second limiting portion and the third limiting portion to the operating mechanism provides additional support for the insulating baffle. At the same time, the second limiting portion and the third limiting portion limit the operating mechanism to prevent the operating mechanism from shifting or exceeding the predetermined range during movement, thereby effectively improving the operating accuracy, stability and safety of the molded case circuit breaker.

[0026] In some embodiments, the first limiting portion includes a fourth plate and a fifth plate.

[0027] The fourth plate is disposed on the baffle along the first direction, the fourth plate is perpendicular to the baffle, and the bottom surface of the fourth plate is in partial contact with the third limiting surface of the partition plate.

[0028] The fifth plate is disposed on the fourth plate along the first direction, the fifth plate is parallel to the baffle, and the distance between the fifth plate and the baffle is greater than the thickness of the partition plate.

[0029] Through the above solution, the distance between the fifth plate and the first plate of the baffle is set to be greater than the thickness of the first partition plate, so that the first partition plate can smoothly extend into the space between the first plate and the fifth plate of the baffle; the fourth plate is located between the baffle and the fifth plate to limit the first partition plate. This design significantly improves the installation convenience of the insulating baffle, avoids friction caused by insufficient space during installation, and at the same time ensures that the insulating baffle can be firmly fixed on the first partition plate after installation, thereby enhancing the overall stability and operation reliability of the circuit breaker structure.

[0030] In some embodiments, an installation cavity is formed between the first limiting portion and the baffle, the partition plate extends into the installation cavity, and the partition plate is in contact with the installation cavity.

[0031] Through the above solution, the installation cavity formed between the first limiting portion and the baffle enables the first partition plate to accurately extend into the installation cavity and be in contact with the inner wall of the cavity of the installation cavity. This design simplifies the installation process of the insulating baffle, ensures that the insulating baffle is fixed and stable in position during installation, and prevents the insulating baffle from loosening or displacing during the use of the molded case circuit breaker.

[0032] In some embodiments, a first limiting groove is provided on the second limiting portion, and one end of the connecting shaft of the operating mechanism extends into the first limiting groove, and one end of the connecting shaft is in contact with the first limiting groove.

[0033] Through the above solution, the first limiting groove is provided on the second limiting portion, so that the connecting shaft of the operating mechanism can be accurately limited in the first limiting groove, ensuring that the connecting shaft has a stable installation position during the operation of the operating mechanism, effectively avoiding displacement or deviation of the connecting shaft caused by external force or movement, and further avoiding unstable operation or mechanical wear caused by the displacement of the connecting shaft, thereby improving the operation reliability and service life of the entire molded case circuit breaker.

[0034] In some embodiments, a second limiting groove is provided on the third limiting portion, and a first protruding portion of the operating mechanism extends into the second limiting groove and abuts against the second limiting groove.

[0035] Through the above solution, by providing the second limiting groove on the third limiting portion, the first protruding portion of the operating mechanism can accurately extend into the second limiting groove and abut against the second limiting groove, effectively restricting the free movement of the first protruding portion, ensuring the position stability and accuracy of the operating mechanism during the use of the molded case circuit breaker, preventing misoperation or structural damage, improving the operating reliability and service life of the operating mechanism, and at the same time simplifying the assembly and maintenance process of the insulating baffle.

[0036] In some embodiments, the insulating baffle further includes a second protruding portion provided on the first plate surface of the first plate, and the second protruding portion is used to protect the first plate.

[0037] Through the above solution, by providing the second protruding portion on the first plate surface of the first plate, the friction between the first plate and the support plate of the magnetic release mechanism is effectively avoided. The second protruding portion not only protects the structural integrity of the first plate and the support plate of the magnetic release mechanism, extends the service life of the first plate and the support plate of the magnetic release mechanism, but also improves the operating stability of the molded case circuit breaker, reduces the failures and maintenance requirements caused by friction, and ensures the long-term reliability and safety of the molded case circuit breaker.

[0038] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to be able to understand the technical means of the embodiments of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. Brief Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of a molded case circuit breaker provided by an embodiment of the present application from a perspective.

[0040] Figure 2 It is a schematic structural diagram of a base provided by an embodiment of the present application from a perspective.

[0041] Figure 3 It is a schematic structural diagram of a molded case circuit breaker provided by an embodiment of the present application from another perspective.

[0042] Figure 4 For Figure 3 The enlarged view of part A in

[0043] Figure 5 It is a schematic connection structure diagram of an operating mechanism, a traction rod and an insulating baffle provided by an embodiment of the present application from a perspective.

[0044] Figure 6 Schematic diagram of the connection structure of an operating mechanism, a drawbar, and an insulating baffle provided in an embodiment of the present application from another perspective.

[0045] Figure 7 Schematic diagram of the structure of an insulating baffle provided in an embodiment of the present application from one perspective.

[0046] Figure 8 Schematic diagram of the structure of an insulating baffle provided in an embodiment of the present application from another perspective.

[0047] Figure 9 Schematic diagram of the connection structure of an operating mechanism, a drawbar, an insulating baffle, and a protection mechanism provided in an embodiment of the present application from one perspective.

[0048] Figure 10 It is Figure 9 The enlarged view of part B in

[0049] Explanation of reference numerals:

[0050] 10. Housing;

[0051] 11. Base; 12. Phase chamber; 13. Partition; 14. Gap;

[0052] 131. First partition;

[0053] 1311. First limiting surface; 1312. Second limiting surface; 1313. Third limiting surface; 1314. Fourth limiting surface;

[0054] 20. Switching mechanism;

[0055] 30. Protection mechanism;

[0056] 31. Thermal tripping mechanism; 32. Magnetic tripping mechanism;

[0057] 321. Support plate;

[0058] 40. Operating mechanism;

[0059] 41. Connecting shaft; 42. First protruding part;

[0060] 50. Drawbar;

[0061] 51. Hinge shaft;

[0062] 60. Insulating baffle;

[0063] 61. Baffle; 62. Limiting plate; 63. Second protruding part;

[0064] 611. First plate; 612. Second plate; 613. Third plate;

[0065] 6111, the first plate surface; 6112, the second plate surface;

[0066] 621, the first limiting part; 622, the second limiting part; 623, the third limiting part; 624, the installation cavity;

[0067] 6211, the fourth plate; 6212, the fifth plate;

[0068] 6221, the first limiting groove;

[0069] 6231, the second limiting groove;

[0070] OX, the first direction; OY, the second direction. Detailed implementation manners

[0071] 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 creative efforts shall fall within the protection scope of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0073] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase "embodiments" appearing in 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 can be combined with other embodiments.

[0074] The term "and / or" herein is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0075] The orientation terms used in the following description are all the directions shown in the figures, and do not limit the specific structure of the current-limiting module of the present application. For example, in the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present 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. Therefore, it should not be construed as a limitation to the present application.

[0076] In addition, expressions such as the OX direction and the OY direction used to describe the indication directions of the operations and structures of the components of the circuit breaker in this embodiment are not absolute but relative. Although these indications are appropriate when the components of the circuit breaker are in the positions shown in the figures, when these positions change, these directions should have different interpretations to correspond to the changes.

[0077] In addition, terms such as "first", "second", etc. in the specification and claims of the present application or in the above-mentioned 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.

[0078] In the description of the present application, unless otherwise specified, the meaning of "a plurality" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0079] In the description of the present 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, "connected" or "coupled" in 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 formed by welding, bonding or integrally molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0080] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0081] Figure 1 This is a schematic structural diagram of a molded case circuit breaker provided by an embodiment of the present application from a perspective. Among them, Figure 1 The middle cover is not shown.Figure 2 This is a schematic structural diagram of a base provided by an embodiment of the present application from a perspective. Figure 3 This is a schematic structural diagram of a molded case circuit breaker provided by an embodiment of the present application from another perspective. Figure 4 is Figure 3 an enlarged view of part A in Figures 1 to 4 As shown, the molded case circuit breaker includes a housing 10, an operating mechanism 40, a traction rod 50, and an insulating baffle 60. A partition 13 is provided inside the housing 10, and the partition 13 divides the internal space of the housing 10 into a plurality of phase chambers 12. The partition 13 is provided with a slot along the first direction OX. Part of the operating mechanism 40 is located in one of the plurality of phase chambers 12. The traction rod 50 is connected to the operating mechanism 40, and the traction rod 50 passes through the partition 13 from the slot. There is a gap 14 between the traction rod 50 and the hole wall of the slot, and the gap 14 communicates with the plurality of phase chambers 12. The insulating baffle 60 is respectively connected to the partition 13, the operating mechanism 40, and the traction rod 50. The insulating baffle 60 is used to block the gap 14 to achieve electrical isolation of the plurality of phase chambers 12.

[0082] The housing 10 is a component in the molded case circuit breaker for accommodating the closing and opening mechanism 20, the protection mechanism 30, the operating mechanism 40, the traction rod 50, etc.

[0083] The housing 10 includes a base 11 and a middle cover (not shown in the figure). The base 11 and the middle cover are buckled to form the internal space of the housing 10. A partition 13 for dividing the internal space of the housing 10 into a plurality of phase chambers 12 is provided inside the housing 10. Each partition 13 includes a first partition 131 provided in the base 11 and a second partition provided in the middle cover. The first partition 131 included in each of the plurality of partitions 13 cooperates with the second partition to divide the internal space of the housing 10 into a plurality of phase chambers 12.

[0084] In some embodiments, along the first direction OX, the number of partitions 13 can be one, that is, the number of the first partition 131 and the second partition is one respectively. In this case, the first partition 131 and the second partition divide the internal space of the housing 10 into two phase chambers 12.

[0085] In some other embodiments, along the first direction OX, the number of partitions 13 can be n, that is, the number of the first partition 131 and the second partition can be n respectively, and the n first partitions 131 correspond to the n second partitions one by one. In this case, the n first partitions 131 and the n second partitions divide the internal space of the housing 10 into (n + 1) phase chambers 12, where n is greater than or equal to 2.

[0086] Exemplarily, as Figures 1 to 3As shown, the number of partition plates 13 is two, that is, the number of the first partition plates 131 and the second partition plates are both two. Specifically, two first partition plates 131 are provided in the base 11, and two second partition plates are provided in the middle cover. The two first partition plates 131 correspond to the two second partition plates one by one, dividing the internal space of the housing 10 into three phase chambers 12. Along the first direction OX, these three phase chambers 12 can be sequentially referred to as the A-phase chamber, the B-phase chamber, and the C-phase chamber.

[0087] Regardless of the number of partition plates 13, each partition plate 13 is provided with a slot hole. The slot hole is located on the second partition plate of each partition plate 13. The hole wall of the slot hole on the second partition plate of each partition plate 13 and the third limiting surface 1313 of the first partition plate 131 together form the hole wall of the slot hole on the partition plate 13. The slot hole penetrates the second partition plate along the first direction OX, and the opening of the slot hole faces the base 11.

[0088] The opening and closing mechanism 20 is a mechanism for opening or closing the molded case circuit breaker. The opening and closing mechanism 20 includes a moving contact and a static contact. When the moving contact contacts the static contact, the molded case circuit breaker is closed. When the moving contact separates from the static contact, the molded case circuit breaker is opened.

[0089] A first installation part for installing the opening and closing mechanism 20 is provided in each phase chamber 12 of the housing 10. The first installation part can be a groove provided at the position corresponding to the opening and closing mechanism 20, or an interval formed by two protrusions, or other structures capable of installing the opening and closing mechanism 20. The specific implementation manner of the first installation part in this embodiment of the application is not specifically limited, as long as the setting of the first installation part can fix the position between the opening and closing mechanism 20 and the base 11.

[0090] The base 11 can be made of PVC (Polyvinyl-Chloride), or can be made of other insulating materials with certain elasticity, such as bakelite, nylon, etc. The specific material of the base 11 in this embodiment of the application is not limited.

[0091] It should be noted that in the above implementation manner, the number of the phase chambers 12 is the same as the number of the opening and closing mechanisms 20, and the positions of the phase chambers 12 are opposite to the positions of the opening and closing mechanisms 20. For example, when the number of the opening and closing mechanisms 20 is one, the number of the phase chambers 12 can be set to one, and this one opening and closing mechanism 20 is installed in this one phase chamber 12. When the number of the opening and closing mechanisms 20 is three, the number of the phase chambers 12 can be set to three. These three phase chambers 12 can be sequentially referred to as the A-phase chamber, the B-phase chamber, and the C-phase chamber. These three opening and closing mechanisms 20 can be respectively installed in the corresponding A-phase chamber, B-phase chamber, and C-phase chamber to form the A-phase, B-phase, and C-phase of the molded case circuit breaker. Regarding the specific setting of the opening and closing mechanism 20 and the phase chamber 12, this embodiment of the application is not specifically limited.

[0092] The protection mechanism 30 includes a thermal tripping mechanism 31 and a magnetic tripping mechanism 32. The thermal tripping mechanism 31 specifically includes a thermal element, a bimetallic strip and other components. When the circuit is in an overloaded state, the thermal element generates heat, the bimetallic strip deforms due to heat, and pushes the free tripping mechanism to act, so that the molded case circuit breaker is in the open state to protect the circuit; the magnetic tripping mechanism 32 specifically includes a moving armature, a static armature, a magnetic yoke and a magnetic yoke. One end of the magnetic yoke is directly connected to the static contact, or is connected to the static contact through the magnetic yoke. The other end of the magnetic yoke is connected to the thermal tripping mechanism 31 or the terminal block. When the circuit is short-circuited or severely overloaded, the moving armature and the static armature of the magnetic tripping mechanism 32 are attracted, and the free tripping mechanism is pushed to act, so that the molded case circuit breaker is in the open state to protect the circuit.

[0093] In each phase chamber 12 of the housing 10, a second mounting portion for mounting the protection mechanism 30 is provided. The second mounting portion may be a groove provided at the position corresponding to the protection mechanism 30, or may be a space formed by two protrusions, or other structures capable of mounting the protection mechanism 30. The specific implementation manner of the second mounting portion in this embodiment of the present application is not specifically limited, as long as the setting of the second mounting portion can fix the position between the protection mechanism 30 and the base 11.

[0094] It should be noted that in the above implementation manner, the number of phase chambers 12 is the same as the number of protection mechanisms 30, and the positions of the phase chambers 12 are opposite to the positions of the protection mechanisms 30. For example, when the number of protection mechanisms 30 is one, the number of phase chambers 12 may be set to one, and this one protection mechanism 30 is installed in this one phase chamber 12; when the number of protection mechanisms 30 is three, the number of phase chambers 12 may be set to three. These three phase chambers 12 may be sequentially referred to as the A-phase chamber, the B-phase chamber and the C-phase chamber, and these three protection mechanisms 30 may be respectively installed in the corresponding A-phase chamber, B-phase chamber and C-phase chamber. Regarding the specific settings of the protection mechanism 30 and the phase chamber 12, the embodiments of the present application are not specifically limited.

[0095] Generally, the molded case circuit breaker drives the traction rod 50 through the heat-induced deformation of the bimetallic strip of the thermal tripping mechanism 31. The traction rod 50 rotates under the push of the bimetallic strip, driving the operating mechanism 40 to act to realize the tripping of the circuit breaker, thereby cutting off the power supply.

[0096] The traction rod 50 is usually hinged to the operating mechanism 40 through a hinge shaft 51. The traction rod 50 can rotate around the hinge shaft 51 and drive the operating mechanism 40 to act.

[0097] When installing the opening and closing mechanism 20, the protection mechanism 30, the traction rod 50 and the operating mechanism 40 in the shell 10, first, each opening and closing mechanism 20 and each protection mechanism 30 are respectively installed in their corresponding phase chambers 12; secondly, the operating mechanism 40 is installed in one phase chamber 12 among the multiple phase chambers 12, and the traction rod 50 is hinged to the operating mechanism 40 through the hinge shaft 51, and the traction rod 50 is located above the first partition 131 along the first direction OX; finally, the middle cover is buckled with the base 11, and the second partition on the middle cover is plugged into and matched with the corresponding first partition 131, so as to complete the installation of the opening and closing mechanism 20, the protection mechanism 30, the traction rod 50 and the operating mechanism 40 in the shell 10.

[0098] For example, Figure 1 As shown, along the first direction OX, the three phase chambers 12 can be called phase A chamber, phase B chamber and phase C chamber in sequence. First, a closing and opening mechanism 20 and a protection mechanism 30 are respectively installed in the phase A chamber, the phase B chamber and the phase C chamber, and the operating mechanism 40 is installed in the phase B chamber. The traction rod 50 hinged to the operating mechanism 40 through the hinge shaft 51 is located above the two first partitions 131 along the first direction OX; then the middle cover is buckled with the base 11, and each second partition on the middle cover is respectively plugged into and matched with its corresponding first partition 131, and the traction rod 50 is limited between the slot on each second partition and the first partition 131 corresponding to each second partition.

[0099] After the traction rod 50 is installed, when a short circuit or overload occurs in the circuit where the molded case circuit breaker is located, the traction rod 50 will rotate relative to the slot driven by the protection mechanism 30, or when the handle of the molded case circuit breaker is turned to open and close the molded case circuit breaker, the traction rod 50 will rotate relative to the slot driven by the operating mechanism 40. Therefore, a gap 14 is provided between the hole wall of the slot on each partition 13 and the side wall of the traction rod 50. Along the first direction OX, both sides of each gap 14 are connected to different phase chambers 12. Therefore, multiple phase chambers 12 in the molded case circuit breaker are connected through the multiple gaps 14.

[0100] When a short circuit or overload occurs in the circuit where the molded case circuit breaker is located, causing the opening and closing mechanism 20 of the molded case circuit breaker to open, the moving contact and the static contact in the opening and closing mechanism 20 are separated and an arc is generated. The temperature of the arc is extremely high. When the arc runs wild in the phase chamber 12, it may burn metal structural parts and produce high-temperature metal vapor, metal solution, metal particles and other high-temperature metal objects. Once these high-temperature metal objects pass through the gap 14 between the traction rod 50 and the hole wall of the slot from one phase chamber 12 to enter other phase chambers 12, it may cause the mechanisms in multiple phase chambers 12 to be electrically connected or short-circuited between phases. For example, it may cause the short-circuit protection mechanisms and overload protection mechanisms in multiple phase chambers to be electrically connected, thereby affecting the performance of the molded case circuit breaker.

[0101] In view of the above analysis, in the embodiment of the present application, an insulating baffle 60 is provided on the partition plate 13, and the insulating baffle 60 is used to block the gap 14 between the traction rod 50 and the hole wall of the slot hole. For the case where there are multiple gaps 14, the present application can be provided with an insulating baffle 60 at each gap 14 to achieve electrical isolation of each phase chamber 12.

[0102] For example, as Figure 1 shown, two partition plates 13 are provided inside the housing 10 along the first direction OX. The two partition plates 13 divide the internal space of the housing 10 into three phase chambers, namely the A-phase chamber, the B-phase chamber, and the C-phase chamber, along the first direction OX. Since two partition plates 13 are provided inside the housing 10, there are two gaps 14 inside the housing 10. The present application is provided with an insulating baffle 60 at each of the two gaps 14 to achieve electrical isolation of the A-phase chamber, the B-phase chamber, and the C-phase chamber.

[0103] In the embodiment of the present application, the insulating baffle 60 can be made of materials such as nylon 6 (abbreviation: PA6) or nylon 66 (abbreviation: PA66). The embodiment of the present application does not limit the material of the insulating baffle 60.

[0104] The principle of the insulating baffle 60 blocking metal objects and electric arcs is as follows: If the high-temperature metal objects and electric arcs generated in a certain phase chamber 12 spray towards the gap 14, some of the metal objects may collide with the insulating baffle 60 and fall off. The fallen metal objects are likely to stop moving and it is very difficult to enter other phase chambers through the gap 14, and it will not affect the mechanisms in other phase chambers 12. The electric arc and some other metal objects may collide with the insulating baffle 60 and change their movement directions. For the metal objects and electric arcs whose movement directions have changed to enter the gap 14, they must bypass the insulating baffle 60 and then wind into the gap 14. After changing the movement direction many times in this way, the energy of the metal objects and electric arcs will be greatly attenuated, and it is very difficult to wind into the gap 14. It can be seen that both the fallen metal objects and the metal objects and electric arcs whose movement directions have changed are very difficult to bypass the insulating baffle 60 and enter the gap 14.

[0105] In the embodiment of the present application, an insulating baffle 60 is provided on the partition plate 13, and the insulating baffle 60 is also connected to the traction rod 50 to block the gap 14 through the insulating baffle 60, which can reduce the possibility that the metal objects and electric arcs generated in one phase chamber enter other phase chambers 12 through the gap 14, facilitating the realization of electrical isolation of multiple phase chambers 12, thereby reducing the possibility of mutual influence on the electrical connections of the mechanisms in multiple phase chambers 12 and improving the service performance of the molded case circuit breaker. In addition, by connecting the insulating baffle 60 to the operating mechanism 40, the installation stability of the insulating baffle 60 can be improved, ensuring that the insulating baffle 60 will not loosen or shift during the long-term use and multiple opening and closing operations of the molded case circuit breaker, thus ensuring the stability and durability of the molded case circuit breaker during use.

[0106] Figure 5 This is a schematic diagram of the connection structure of an operating mechanism, a traction rod, and an insulating baffle provided by an embodiment of the present application from a perspective. Figure 6 This is a schematic diagram of the connection structure of an operating mechanism, a traction rod, and an insulating baffle provided by an embodiment of the present application from another perspective. Figure 7 This is a schematic diagram of the structure of an insulating baffle provided by an embodiment of the present application from a perspective. Figure 8 This is a schematic diagram of the structure of an insulating baffle provided by an embodiment of the present application from another perspective. As Figures 5 to 8 shown, in some embodiments, the insulating baffle 60 includes a baffle 61 and a limiting plate 62. The baffle 61 is substantially parallel to the partition plate 13, and the limiting plate 62 is arranged on the baffle 61 along the first direction OX.

[0107] Both the partition plate 13 and the traction rod 50 are connected to the baffle 61, and the baffle 61 is used to block the gap 14.

[0108] Both the partition plate 13 and the operating mechanism 40 are connected to the limiting plate 62, and the limiting plate 62 is used to limit the baffle 61 and the operating mechanism 40.

[0109] Herein, the fact that the baffle 61 is substantially parallel to the partition plate 13 means that the degree of the angle between the baffle 61 and the partition plate 13 is approximately 0 degree, or a relatively small value such as 1 degree or 2 degrees, that is, the degree of the angle between the baffle 61 and the first partition plate 131 is approximately 0 degree, or a relatively small value such as 1 degree or 2 degrees.

[0110] It should be noted that along the first direction OX, the baffle 61 has two large plate surfaces opposite to each other, and these two large plate surfaces have the largest area relative to other plate surfaces in the baffle 61. Assuming that the baffle 61 is arranged substantially parallel to the first partition plate 131, the plate surface with a larger area in the baffle 61 can be opposite to the gap 14. In this way, the area of the baffle 61 blocking the gap 14 can be increased, which is convenient for improving the effect of the baffle 61 blocking the gap 14.

[0111] The traction rod 50 is located above each first partition plate 131 along the first direction OX. Connecting the baffle 61 to the first partition plate 131 and the traction rod 50 can effectively seal the gap 14 between the traction rod 50 and the partition plate 13, prevent the transfer of electric arcs and metal objects between multiple phase chambers 12, thereby achieving electrical isolation between each phase chamber 12 and improving the safety of the molded case circuit breaker. In addition, connecting the baffle 61 to the first partition plate 131 can make the baffle 61 better fit on the first partition plate 131, ensuring that the baffle 61 will not loosen or shift during long-term use and multiple opening and closing operations, thereby ensuring the stability and durability of the molded case circuit breaker during use.

[0112] Herein, as Figure 5As shown in the figure, when it is necessary to arrange two insulating baffles 60 in the housing 10, the two insulating baffles 60 are symmetrically arranged.

[0113] It should be noted that after the limiting plate 62 is combined with the baffle 61, it is connected to the first partition plate 131. Through the limiting plate 62, the baffle 61 can be more firmly fixed on the first partition plate 131, enhancing the stability of the insulating baffle 60 and ensuring that the insulating baffle 60 will not shift or loosen during long-term use or multiple operations of the molded case circuit breaker, thereby ensuring the continuous effectiveness of the electrical isolation effect.

[0114] Since the opening and closing operations of the molded case circuit breaker will cause the movement of the traction rod 50 and the operating mechanism 40, if the insulating baffle 60 is not reliably fixed, it may be deformed or detached due to the impact of force. Through the connection between the limiting plate 62 and the operating mechanism 40, it is ensured that the insulating baffle 60 can be stably located at the predetermined position, covering the gap 14 between the traction rod 50 and the pore wall of the slot hole, avoiding the offset caused by the movement of the operating mechanism 40 or the traction rod 50, and ensuring that the baffle 61 always effectively plays the role of electrical isolation.

[0115] In the embodiment of the present application, the insulating baffle 60 includes a baffle 61 and a limiting plate 62 arranged on the baffle 61 along the first direction OX. Through the connection between the baffle 61 and the first partition plate 131 and the traction rod 50, the gap 14 between the traction rod 50 and the pore wall of the slot hole can be effectively covered, preventing metal objects and electric arcs from being conducted from one phase chamber 12 to other phase chambers 12 during the operation of the molded case circuit breaker, and realizing the electrical isolation between multiple phase chambers 12; through the connection between the limiting plate 62 and the first partition plate 131 and the operating mechanism 40, the stability of the insulating baffle 60 is further enhanced, avoiding the displacement or deformation of the insulating baffle 60 during the operation of the molded case circuit breaker, ensuring the durability of the electrical isolation, as well as the safety and reliability of the operation of the molded case circuit breaker.

[0116] As Figures 5 to 8 shown, in some embodiments, the baffle 61 includes a first plate 611, a second plate 612 and a third plate 613 arranged along the first direction OX. The first plate 611, the second plate 612 and the third plate 613 are sequentially connected along the second direction OY, and the second direction OY is perpendicular to the first direction OX.

[0117] The first plate 611 is parallel to the third plate 613. The top surface of the first plate 611 is lower than the bottom surface of the third plate 613. The bottom surface of the second plate 612 is connected to the top surface of the first plate 611, and the top surface of the second plate 612 is connected to the bottom surface of the third plate 613.

[0118] Among them, the first plate 611, the second plate 612, and the third plate 613 are sequentially connected along the second direction OY to form a baffle 61. The first plate 611 is located at the lower part of the baffle 61, the second plate 612 is located in the middle of the baffle 61 and is used to bridge the first plate 611 and the third plate 613, and the third plate 613 is located at the upper part of the baffle 61.

[0119] It should be noted that the first plate 611 is used to provide a basic shielding effect to prevent metal objects and electric arcs from below the drawbar 50 or the closing and opening mechanism 20 from entering other phase chambers; the second plate 612 serves as a bridge connecting the first plate 611 and the third plate 613, enhancing the overall strength of the baffle 61; the third plate 613 is responsible for providing the uppermost shielding, and the third plate 613 can prevent metal objects and electric arcs above from entering other phase chambers through the gap 14 between the drawbar 50 body and the slot hole.

[0120] In the embodiment of the present application, by combining the first plate 611, the second plate 612, and the third plate 613 to form the baffle 61, a multi-level electrical isolation and shielding effect can be achieved. The height and position design of the first plate 611, the second plate 612, and the third plate 613 ensure comprehensive isolation between each phase chamber, effectively preventing metal objects and electric arcs from crossing the phase chambers, and ensuring the safety performance of the molded case circuit breaker. At the same time, by combining the first plate 611, the second plate 612, and the third plate 613 to form the baffle 61, the physical strength and durability of the baffle 61 are also enhanced, ensuring that the molded case circuit breaker can maintain stability for a long time during operation.

[0121] As Figure 5 、 Figure 7 and Figure 8 shown, in some embodiments, the first plate 611 has a first plate surface 6111 and a second plate surface 6112 along the first direction OX, and the second plate surface 6112 abuts against the first limiting surface 1311 of the partition 13.

[0122] The plate surface of the second plate 612 facing the partition 13 abuts against the second limiting surface 1312 of the partition 13.

[0123] The bottom surface of the third plate 613 partially abuts against the third limiting surface 1313 of the partition 13. An installation hole 6131 is provided on the third plate 613, the drawbar 50 passes through the installation hole 6131, and the hole wall of the installation hole 6131 abuts against the side wall of the drawbar 50.

[0124] Among them, the first plate surface 6111 of the first plate 611 faces away from the first partition 131, and the second plate surface 6112 of the first plate 611 faces the first partition 131.

[0125] It should be noted that the baffle 61 is respectively connected to the first partition 131 and the second partition of the partition 13. The second plate surface 6112 of the first plate 611 abuts against the first limiting surface 1311 of the first partition 131, that is, the second plate surface 6112 of the first plate 611 fits against the first limiting surface 1311 of the first partition 131, which can effectively ensure that the position of the first plate 611 is fixed when the baffle 61 is installed and will not be displaced due to the operation or movement of the molded case circuit breaker.

[0126] Among them, the bottom surface of the second plate 612 is connected to the top surface of the first plate 611, the top surface of the second plate 612 is connected to the bottom surface of the third plate 613, and the included angle between the second plate 612 and the first plate 611 is an obtuse angle. The plate surface of the second plate 612 facing the first partition 131 partially abuts against the second limiting surface 1312 of the first partition 131. The second limiting surface 1312 of the first partition 131 is an inclined surface between the first limiting surface 1311 and the third limiting surface 1313 of the first partition 131.

[0127] Among them, the bottom surface of the third plate 613 partially abuts against the third limiting surface 1313 of the first partition 131. An installation hole 6131 is provided on the third plate 613, which allows the traction rod 50 to pass through, and the hole wall of the installation hole 6131 abuts against the side wall of the traction rod 50.

[0128] It should be noted that when the second plate surface 6112 of the first plate 611 abuts against the first limiting surface 1311 of the first partition 131, the plate surface of the second plate 612 facing the first partition 131 abuts against the second limiting surface 1312 of the partition 13, and the bottom surface of the third plate 613 partially abuts against the third limiting surface 1313 of the first partition 131, a clamping structure is formed, so that the baffle 61 formed by the first plate 611, the second plate 612 and the third plate 613 can be clamped on one side of the first partition 131, ensuring that the baffle 61 can be fixed on the first partition 131 during installation and effectively preventing the baffle 61 from loosening or shifting during operation.

[0129] It should be noted that the hole wall of the installation hole 6131 closely abuts against the side wall of the traction rod 50, ensuring that there is no extra gap when the traction rod 50 passes through the installation hole 6131. Through this close fit, it can effectively prevent metal objects and electric arcs from entering other phase chambers 12 through the space between the installation hole 6131 and the traction rod 50, avoiding electrical connection or short circuit between adjacent phase chambers 12 during the operation of the molded case circuit breaker and ensuring the electrical isolation effect between each phase chamber 12.

[0130] Based on the principle of the insulating baffle 60 blocking metal objects and electric arcs described above, when the baffle 61 is provided on the first limiting surface 1311 of the first partition 131, assuming that metal objects and electric arcs are generated in the phase chamber 12 on the side of the first limiting surface 1311 of the first partition 131, it is very difficult for these metal objects and electric arcs to bypass the baffle 61 and enter the gap 14, and it is also very difficult to enter the phase chamber 12 on the side of the third limiting surface 1313 of the first partition 131 through the gap 14; assuming that metal objects and electric arcs are generated in the phase chamber 12 on the side of the third limiting surface 1313 of the first partition 131, these metal objects and electric arcs may enter the gap 14, but it is very difficult to bypass the baffle 61 and enter the phase chamber 12 on the side of the first limiting surface 1311 of the first partition 131.

[0131] In the embodiment of the present application, through the first plate 611 and the second plate 612, the baffle 61 can be stably installed on the first partition 131 and will not shift due to the operation or movement of the plastic case circuit breaker; the baffle 61 can completely block the gap 14 between the traction rod 50 and the slot hole, so that the high-temperature metal objects and electric arcs generated in a certain phase chamber 12 must bypass the baffle 61 before they may enter the gap 14, increasing the difficulty for the metal objects and electric arcs to enter the gap 14 and improving the effect of the baffle 61 blocking the gap 14.

[0132] As Figure 5 、 Figure 7 and Figure 8 shown, in some embodiments, the limiting plate 62 includes a first limiting portion 621, a second limiting portion 622, and a third limiting portion 623.

[0133] The first limiting portion 621 is arranged on the baffle 61 along the first direction, the second limiting portion 622 and the third limiting portion 623 are both arranged on the first limiting portion 621 along the first direction, and the second limiting portion 622 is connected to the third limiting portion 623.

[0134] The first limiting portion 621 is connected to the partition 13, and the second limiting portion 622 and the third limiting portion 623 are both connected to the operating mechanism 40.

[0135] It should be noted that the first limiting portion 621 is arranged on the third plate 613 of the baffle 61 along the first direction OX, and the first limiting portion 621 is connected to the first partition 131. The first limiting portion 621 is used to fix the limiting plate 62 and the baffle 61 on the first partition 131, ensuring that the insulating baffle 60 will not loosen or shift during installation and providing support for the second limiting portion 622 and the third limiting portion 623.

[0136] It should be noted that the second limiting portion 622 is arranged on the first limiting portion 621 along the first direction OX, and the baffle 61 and the second limiting portion 622 are respectively located at both ends of the second limiting portion 622. The second limiting portion 622 can transmit the supporting force of the first limiting portion 621 to the third limiting portion 623, and provide a more stable connection for the operating mechanism 40, ensuring that the operating mechanism 40 receives sufficient support during the opening and closing operations of the molded case circuit breaker, and avoiding loosening or malfunction of the operating mechanism 40 due to external force or vibration.

[0137] It should be noted that the third limiting portion 623 is also arranged on the first limiting portion 621 along the first direction OX, and the third limiting portion 623 is connected to the second limiting portion 622. The third limiting portion 623 and the second limiting portion 622 act together to provide additional stability for the operating mechanism 40. By connecting with the operating mechanism 40, the third limiting portion 623 can evenly disperse the external force when the operating mechanism 40 is subjected to external force, prevent the operating mechanism 40 from shifting or failing during movement, and thus avoid damage to the components of the operating mechanism 40 during operation.

[0138] In the embodiment of the present application, the limiting plate 62 is formed by combining the first limiting portion 621, the second limiting portion 622 and the third limiting portion 623. The first limiting portion 621 is connected to the first partition plate 131 and the third plate 613 of the baffle 61, ensuring the installation stability of the insulating baffle 60 on the first partition plate 131. The connection between the second limiting portion 622 and the third limiting portion 623 and the operating mechanism 40 provides additional support for the insulating baffle 60. At the same time, the second limiting portion 622 and the third limiting portion 623 limit the operating mechanism 40 to prevent the operating mechanism 40 from shifting or exceeding the predetermined range during movement, thereby effectively improving the operating accuracy, stability and safety of the molded case circuit breaker.

[0139] As Figure 5 、 Figure 7 and Figure 8 shown, in some embodiments, the first limiting portion 621 includes a fourth plate 6211 and a fifth plate 6212.

[0140] The fourth plate 6211 is arranged on the baffle 61 along the first direction OX, the fourth plate 6211 is perpendicular to the baffle 61, and the bottom surface of the fourth plate 6211 is partially in contact with the third limiting surface 1313 of the partition plate 13.

[0141] The fifth plate 6212 is arranged on the fourth plate 6211 along the first direction OX, the fifth plate 6212 is parallel to the baffle 61, and the distance between the fifth plate 6212 and the baffle 61 is greater than the thickness of the partition plate 13.

[0142] Among them, the fourth plate 6211 is arranged on the third plate 613 of the baffle 61 along the first direction OX. The fourth plate 6211 is perpendicular to the baffle 61, and the top surface of the fourth plate 6211 is not higher than the bottom surface of the mounting hole 6131. The bottom surface of the fourth plate 6211 is flush with the bottom surface of the third plate 613, so that the bottom surfaces of both the fourth plate 6211 and the third plate 613 can be in full contact with the third limiting surface 1313 of the partition 13.

[0143] It should be noted that a fillet is provided at the connection between the fourth plate 6211 and the fifth plate 6212. By providing a fillet at the connection between the fourth plate 6211 and the fifth plate 6212, stress can be effectively dispersed, making the stress more evenly distributed in the fillet area, reducing local stress concentration, thereby improving the strength and durability of the limiting plate 62; at the same time, preventing the limiting plate 62 from gradually fatiguing or even breaking due to repeated stress during use, extending the service life of the limiting plate 62, and ensuring the stability of the circuit breaker during long-term operation.

[0144] It should be noted that the distance between the fifth plate 6212 and the first plate 611 of the baffle 61 is greater than the thickness of the first partition 131. When installing the insulating baffle 60, the first partition 131 extends into the space between the fifth plate 6212 and the first plate 611. By setting the distance between the fifth plate 6212 and the first plate 611 to be greater than the thickness of the first partition 131, it is convenient to install the insulating baffle 60 on the first partition 131.

[0145] In the embodiment of the present application, by setting the distance between the fifth plate 6212 and the first plate 611 of the baffle 61 to be greater than the thickness of the first partition 131, the first partition 131 can smoothly extend into the space between the first plate 611 of the baffle 61 and the fifth plate 6212; the fourth plate 6211 is located between the baffle 61 and the fifth plate 6212 to limit the first partition 131. Through this design, the installation convenience of the insulating baffle 60 is significantly improved, avoiding friction caused by insufficient space during installation. At the same time, it ensures that the insulating baffle 60 can be firmly fixed on the first partition 131 after installation, thereby enhancing the overall stability and operation reliability of the circuit breaker structure.

[0146] As Figure 5 and Figure 8 shown, in some embodiments, an installation cavity 624 is formed between the first limiting portion 621 and the baffle 61, and the partition 13 extends into the installation cavity 624 and abuts against the installation cavity 624.

[0147] Among them, the fourth plate 6211 and the fifth plate 6212 of the first limiting portion 621, as well as the first plate 611, the second plate 612 and the third plate 613 of the baffle 61 cooperate together to form an installation cavity 624, and the installation cavity 624 is used to install the first partition plate 131, so that the insulating baffle 60 can be stably fixed on the first partition plate 131.

[0148] It should be noted that when the first partition plate 131 extends into the installation cavity 624, the first limiting surface 1311 of the first partition plate 131 abuts against the second plate surface 6112 of the first plate 611, the second limiting surface 1312 of the first partition plate 131 abuts against the plate surface of the second plate 612 facing the first partition plate 131, the third limiting surface 1313 of the first partition plate abuts against the bottom surface of the third plate 613 and the bottom surface of the fourth plate 6211 respectively, and the fourth limiting surface 1314 of the first partition plate 131 abuts against the plate surface of the fifth plate 6212 facing the first partition plate 131. That is, after the first partition plate 131 extends into the installation cavity 624, it can closely abut against the inner wall of the cavity of the installation cavity 624. Such a design not only improves the stability of the insulating baffle 60, but also makes the entire installation process more convenient, ensuring the accuracy and firmness of the installation.

[0149] In the embodiment of the present application, through the installation cavity 624 formed between the first limiting portion 621 and the baffle 61, the first partition plate 131 can accurately extend into the installation cavity 624 and abut against the inner wall of the cavity of the installation cavity 624. This design simplifies the installation process of the insulating baffle 60, ensures that the insulating baffle 60 is fixed and stable in position during installation, and prevents the insulating baffle 60 from loosening or displacing during the use of the plastic case circuit breaker.

[0150] As Figure 5 and Figure 7 shown, in some embodiments, a first limiting groove 6221 is provided on the second limiting portion 622, and one end of the connecting shaft 41 of the operating mechanism 40 extends into the first limiting groove 6221, and one end of the connecting shaft 41 abuts against the first limiting groove 6221.

[0151] Among them, the first limiting groove 6221 is a semi-circular groove, which is specially designed to accommodate the end of the connecting shaft 41 of the operating mechanism 40. Through the first limiting groove 6221, it can be ensured that the connecting shaft 41 can have a clear positioning and limiting position during the operation of the operating mechanism 40, preventing the free movement of the connecting shaft 41.

[0152] It should be noted that as Figure 5As shown in the figure, two insulating baffles 60 are arranged inside the housing 10, and the two insulating baffles 60 are symmetrically arranged. One end of the connecting shaft 41 extends into the first limiting groove 6221 of the second limiting part 622 of one insulating baffle 60 and abuts against the first limiting groove 6221 of the second limiting part 622 of one insulating baffle 60. The other end of the connecting shaft 41 extends into the first limiting groove 6221 of the second limiting part 622 of the other insulating baffle 60 and abuts against the first limiting groove 6221 of the second limiting part 622 of the other insulating baffle 60.

[0153] It should be noted that when the end of the connecting shaft 41 abuts against the first limiting groove 6221, the diameter of the first limiting groove 6221 is equal to the diameter of the connecting shaft 41, so that the connecting shaft 41 can abut against the first limiting groove 6221.

[0154] In the embodiment of the present application, by arranging the first limiting groove 6221 on the second limiting part 622, the connecting shaft 41 of the operating mechanism 40 can be accurately limited in the first limiting groove 6221, ensuring that the connecting shaft 41 has a stable installation position during the operation of the operating mechanism 40, effectively avoiding the displacement or deviation of the connecting shaft 41 caused by external force or movement, and further avoiding the unstable operation or mechanical wear caused by the displacement of the connecting shaft 41, thereby improving the operation reliability and service life of the entire molded case circuit breaker.

[0155] As Figure 6 and Figure 7 shown in the figure, in some embodiments, a second limiting groove 6231 is arranged on the third limiting part 623, and the first protruding part 42 of the operating mechanism 40 extends into the second limiting groove 6231 and abuts against the second limiting groove 6231.

[0156] Among them, the first protruding part 42 is a cylindrical protruding part, and the second limiting groove 6231 is specially designed to accommodate the first protruding part 42. Through the second limiting groove 6231, it can be ensured that the first protruding part 42 remains in a fixed position during the operation of the operating mechanism 40.

[0157] It should be noted that the shape of the second limiting groove 6231 is adapted to the shape of the first protruding part 42, and the thickness of the first protruding part 42 is equal to the depth of the second limiting groove 6231, so that the first protruding part 42 can abut against the second limiting groove 6231.

[0158] The depth of the second limiting groove 6231 refers to the length of the second limiting groove along the first direction OX.

[0159] In the embodiments of the present application, by providing a second limiting groove 6231 on the third limiting portion 623, the first protruding portion 42 of the operating mechanism 40 can accurately extend into the second limiting groove 6231 and abut against the second limiting groove 6231, effectively restricting the free movement of the first protruding portion 42, ensuring the position stability and accuracy of the operating mechanism 40 during the use of the molded case circuit breaker, preventing misoperation or structural damage, improving the operating reliability and service life of the operating mechanism 40, and simplifying the assembly and maintenance process of the insulating baffle 60.

[0160] As Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 shown, in some embodiments, the insulating baffle 60 further includes a second protruding portion 63, the second protruding portion 63 is provided on the first plate surface 6111 of the first plate 611, and the second protruding portion 63 is used to protect the first plate 611.

[0161] Wherein, a protection mechanism 30 is provided in each phase chamber 12 inside the housing 10, the protection mechanism 30 includes a thermal tripping mechanism 31 and a magnetic tripping mechanism 32. When the insulating baffle 60 is installed on the first partition plate 131, the distance between the first plate 611 of the insulating baffle 60 and a support plate 321 of the magnetic tripping mechanism 32 installed in the phase chamber 12 where the first plate 611 is located is relatively close. During the use of the molded case circuit breaker, friction is likely to occur between the first plate 611 and the support plate 321 of the magnetic tripping mechanism 32.

[0162] It should be noted that the surface areas of the support plate 321 of the magnetic tripping mechanism 32 and the first plate 611 are relatively large. If friction occurs between the support plate 321 of the magnetic tripping mechanism 32 and the first plate 611, it is likely to cause an increase in friction due to the large surface area, thereby exacerbating the wear of the support plate 321 of the magnetic tripping mechanism 32 and the first plate 611.

[0163] By providing the second protruding portion 63 on the first plate surface 6111 of the first plate 611 facing the support plate 321 of the magnetic tripping mechanism 32, direct contact between the first plate 611 and the support plate 321 of the magnetic tripping mechanism 32 can be prevented. The second protruding portion 63 provides a buffer area on the first plate 611, reducing the contact area between the first plate 611 and the support plate 321 of the magnetic tripping mechanism 32, effectively reducing the friction force, and further reducing the possibility of wear occurring between the support plate 321 of the magnetic tripping mechanism 32 and the first plate 611, extending the service lives of the first plate 611 and the support plate 321 of the magnetic tripping mechanism 32, and reducing the risk of failures caused by wear during the long-term operation of the molded case circuit breaker.

[0164] In addition, if the first plate 611 is worn or damaged due to friction, it will affect the stability of the entire insulating baffle 60. The second protrusion 63 prevents friction from occurring between the first plate 611 and the support plate 321 of the magnetic release mechanism 32, effectively protecting the structural integrity of the first plate 611 and preventing the insulating effect of the insulating baffle 60 from being affected by the wear of the first plate 611.

[0165] The support plate 321 of the magnetic release mechanism 32 is also a key component of the circuit breaker. If the support plate 321 of the magnetic release mechanism 32 rubs against the first plate 611 for a long time, it may also cause damage; the second protrusion 63 also protects the surface of the support plate 321 of the magnetic release mechanism 32, preventing the support plate 321 of the magnetic release mechanism 32 from wearing too fast.

[0166] The second protrusion 63 can also serve as an additional support point between the first plate 611 and the support plate 321 of the magnetic release mechanism 32, helping to stabilize the relative position between the first plate 611 and the support plate 321 of the magnetic release mechanism 32, and preventing the first plate 611 and the support plate 321 of the magnetic release mechanism 32 from shifting due to vibration or movement. It ensures that the first plate 611 and the support plate 321 of the magnetic release mechanism 32 always maintain an appropriate distance and relative position during the operation of the molded case circuit breaker, further reducing unnecessary friction and damage.

[0167] In the embodiment of the present application, by providing the second protrusion 63 on the first plate surface 6111 of the first plate 611, the friction between the first plate 611 and the support plate 321 of the magnetic release mechanism 32 is effectively avoided. The second protrusion 63 not only protects the structural integrity of the first plate 611 and the support plate 321 of the magnetic release mechanism 32, extends the service life of the first plate 611 and the support plate 321 of the magnetic release mechanism 32, but also improves the operating stability of the molded case circuit breaker, reduces failures and maintenance requirements caused by friction, and ensures the long-term reliability and safety of the molded case circuit breaker.

[0168] In the embodiment of the present application, the baffle 61, the limiting plate 62, and the second protrusion 63 of the insulating baffle 60 can be integrally formed, that is, the first plate 611, the second plate 612, the third plate 613, the first limiting portion 621, the second limiting portion 622, the third limiting portion 623, and the second protrusion 63 can be integrally formed. In this way, the assembly process of the insulating baffle 60, the first partition plate 131, the operating mechanism 40, and the traction rod 50 can be saved.

[0169] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; 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 described 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 various embodiments of the present application.

Claims

1. A molded case circuit breaker, characterized in that, Comprising: A housing, which is internally provided with a partition board. The partition board divides the internal space of the housing into multiple phase chambers, and the partition board is provided with a slot hole along a first direction; An operating mechanism, part of which is located in the phase chamber; A traction rod, which is connected to the operating mechanism and passes through the partition board from the slot hole. There is a gap between the traction rod and the hole wall of the slot hole, and the gap communicates with the multiple phase chambers; An insulating baffle, which is respectively connected to the partition board, the operating mechanism and the traction rod. The insulating baffle is used to block the gap to achieve electrical isolation of the multiple phase chambers.

2. A molded case circuit breaker according to claim 1, characterized in that, The insulating baffle includes a baffle and a limiting plate, and the limiting plate is arranged on the baffle along the first direction; Both the partition board and the traction rod are connected to the baffle, and the baffle is used to block the gap; Both the partition board and the operating mechanism are connected to the limiting plate, and the limiting plate is used to limit the baffle and the operating mechanism.

3. A molded case circuit breaker according to claim 2, characterized in that, The baffle includes a first plate, a second plate and a third plate arranged along the first direction. The first plate, the second plate and the third plate are sequentially connected along a second direction, and the second direction is perpendicular to the first direction; The first plate is parallel to the third plate. The top surface of the first plate is lower than the bottom surface of the third plate. The bottom surface of the second plate is connected to the top surface of the first plate, and the top surface of the second plate is connected to the bottom surface of the third plate.

4. A molded case circuit breaker according to claim 3, characterized in that, The first plate has a first plate surface and a second plate surface along the first direction, and the second plate surface abuts against a first limiting surface of the partition board; The plate surface of the second plate facing the partition board abuts against a second limiting surface of the partition board; The bottom surface of the third plate partially abuts against a third limiting surface of the partition board. An installation hole is provided on the third plate, and the traction rod passes through the installation hole, and the hole wall of the installation hole abuts against the side wall of the traction rod.

5. A molded case circuit breaker according to claim 2, characterized in that, The limiting plate includes a first limiting part, a second limiting part and a third limiting part; The first limiting part is arranged on the baffle along the first direction. The second limiting part and the third limiting part are both arranged on the first limiting part along the first direction, and the second limiting part is connected to the third limiting part; The first limiting part is connected to the partition board, and the second limiting part and the third limiting part are both connected to the operating mechanism.

6. A molded case circuit breaker according to claim 5, wherein, The first limiting part includes a fourth plate and a fifth plate; The fourth plate is arranged on the baffle along the first direction. The fourth plate is perpendicular to the baffle, and the bottom surface of the fourth plate partially abuts against the third limiting surface of the partition board; The fifth plate is arranged on the fourth plate along the first direction. The fifth plate is parallel to the baffle, and the distance between the fifth plate and the baffle is greater than the thickness of the partition board.

7. A molded case circuit breaker according to claim 6, characterized in that, An installation cavity is formed between the first limiting part and the baffle. The partition board extends into the installation cavity, and the partition board abuts against the installation cavity.

8. A molded case circuit breaker according to claim 5, characterized in that, A first limiting groove is provided on the second limiting part. One end of the connecting shaft of the operating mechanism extends into the first limiting groove, and one end of the connecting shaft abuts against the first limiting groove.

9. A molded case circuit breaker according to claim 5, characterized in that, A second limiting groove is provided on the third limiting portion, a first protruding portion of the operating mechanism extends into the second limiting groove, and the first protruding portion abuts against the second limiting groove.

10. A molded case circuit breaker according to claim 4, characterized in that, The insulating baffle further includes a second protruding portion, the second protruding portion is provided on a first surface of the first plate, and the second protruding portion is used to protect the first plate.

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