Magnetic flux release assembly and circuit breaker

Abstract

The utility model discloses a magnetic flux release assembly and a circuit breaker, and the assembly comprises an installation support, a push rod, and an electromagnetic mechanism. The electromagnetic mechanism comprises a coil assembly and an iron core assembly; the coil assembly is fixed to the installation support, the iron core assembly is arranged in a sliding mode relative to the coil assembly, and the coil assembly drives the iron core assembly to be actuated after being powered on. The push rod comprises a first cylinder part and an actuating part, the first cylinder part is of a hollow structure and is provided with a first opening, the first cylinder part is arranged on the periphery of the electromagnetic mechanism in a sleeving mode through the first opening, and the inner wall of the first cylinder part is clamped with or abuts against the iron core assembly; the actuating part is connected to one side of the first cylinder part; the direct-acting type magnetic flux release has the characteristics of a direct-acting type magnetic flux release structure.

Description

Technical Field

[0001] The present application relates to the electrical field, and to a flux release assembly and a circuit breaker. Background Art

[0002] In molded case circuit breakers, a flux release is often used to implement short circuit, overload or leakage protection. The principle of its implementation is that when a short circuit, overload or leakage protection occurs, the controller of the flux release assembly drives the flux release to energize, and the flux release is actuated to rotate the trip rod of the operating mechanism, and finally the operating mechanism performs the opening operation.

[0003] Most of the existing flux releases are equipped with energy storage amplification mechanisms, such as a flux release assembly disclosed in CN115527810A, which utilizes a set of energy storage structures. When the flux release is working, the electromagnetic mechanism (also called the moving iron core) of the flux release pushes the lock to unlock. At this time, the action rod pushes the tripping rod (also called the tripping rod) of the operating mechanism to rotate under the action of the energy storage spring, so that the operating mechanism performs the opening operation.

[0004] This structure forms a set of energy storage structure through the lock, energy storage spring and action rod. The tripping force is relatively stable, but the required parts are many, which will make the structure of the magnetic flux release complicated, which is not conducive to production and assembly.

[0005] Therefore, how to design a new type of flux release assembly to reduce the number of parts of the release is a direction worthy of research. Summary of the invention

[0006] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a flux release assembly and a circuit breaker to reduce parts.

[0007] The present application provides: a flux release assembly, which includes a mounting bracket, a push rod and an electromagnetic mechanism; the electromagnetic mechanism includes a coil assembly and an iron core assembly; the coil assembly is fixed to the mounting bracket, and the iron core assembly is slidably arranged relative to the coil assembly, and the coil assembly causes the iron core assembly to be actuated after being energized; the push rod includes a first cylindrical portion and an actuating portion, the first cylindrical portion is a hollow structure and has a first opening, the first cylindrical portion is sleeved on the periphery of the electromagnetic mechanism through the first opening, and the inner wall of the first cylindrical portion is stuck or abutted against the iron core assembly; the actuating portion is connected to one side of the first cylindrical portion.

[0008] With this structure, the push rod is directly connected to the electromagnetic mechanism. Compared with the existing structure with energy storage components such as lock buckles, the push rod of this release directly follows the movement of the electromagnetic mechanism, so the transmission structure is more streamlined, and fewer components can also reduce the space occupied. At the same time, the push rod adopts the form of the first cylinder part, which makes the assembly between the push rod and the electromagnetic mechanism very convenient, and only needs to set the first cylinder part on the electromagnetic mechanism.

[0009] In some embodiments of the present application, from the height direction of the electromagnetic mechanism, the mounting bracket is located below the core assembly, the core assembly is actuated in a direction away from the mounting bracket, and the actuating portion extends directly below the mounting bracket.

[0010] By adopting this structure, it is relatively easier to design the fixing method and position of the electromagnetic mechanism.

[0011] In some embodiments of the present application, a second cylindrical portion is provided on the mounting bracket, the second cylindrical portion is a hollow structure, a second opening is provided on the second cylindrical portion, the second cylindrical portion is sleeved on the outside of the coil assembly, and the second cylindrical portion is at least partially covered by the first cylindrical portion; the coil assembly is fixed to the mounting bracket through the second cylindrical portion.

[0012] This structure is more conducive to the assembly of the electromagnetic mechanism, because the coil assembly of the electromagnetic mechanism is a static component. The electromagnetic mechanism can be placed in the second cylindrical portion. At this time, the second cylindrical portion is located around the coil assembly, and then the first cylindrical portion is sleeved so that it is at least partially covered by the first cylindrical portion, which makes assembly extremely convenient.

[0013] In some embodiments of the present application, no matter whether the core assembly is actuated or not, there is always an overlapping portion between the first cylinder portion and the second cylinder portion in the height direction of the electromagnetic mechanism.

[0014] By adopting this structure in which the overlapping parts always exist, the sealing property of the magnetic flux release can be ensured, making the electromagnetic mechanism more stable.

[0015] In some embodiments of the present application, a through hole is formed on the second cylinder portion; or / and, an avoidance hole is formed on the mounting bracket, and the avoidance hole is used for the actuator to pass through.

[0016] With this structure, bolt fastening or clamping fixation will make the fastening between the mounting bracket and the cover body more stable. The provision of the through hole will facilitate the routing of the flux release and reduce the air resistance during installation. The design of the avoidance hole will allow the actuator to be aligned with the tripping rod and installed at a position corresponding to the tripping rod.

[0017] A circuit breaker comprises an operating mechanism, a contact system and a housing, wherein the operating mechanism is used to drive the contact system to move; wherein, the operating mechanism also comprises the above-mentioned flux release assembly; the operating mechanism comprises a tripping rod and a reset rod, the tripping rod is provided with a driven part, the actuating part corresponds to the driven part, after the core assembly is actuated, the driven part is driven to move by the actuating part, so that the operating mechanism performs a tripping operation; during the re-tripping process of the operating mechanism, the reset rod acts on the push rod to cause the electromagnetic mechanism to reset.

[0018] In some embodiments of the present application, the operating mechanism includes a handle, a lever and a frame, the handle is fixed to the lever, and the lever and the frame are rotatably arranged; the reset rod is part of the lever or the reset rod is fixed to the lever or the reset rod is part of the handle or the reset rod is fixed to the handle.

[0019] With this structure, there are many ways to set the reset rod, which can be associated with the handle or with the lever. No matter which form, the reset rod can reset the reset part.

[0020] In some embodiments of the present application, the shell includes a base, a cover body, and an upper cover; the cover body is arranged on the base, the upper cover is arranged on the cover body, the contact system is arranged in the space formed by the cover body and the base, and the mounting bracket is fixed on the side of the cover body facing the upper cover.

[0021] In some embodiments of the present application, the core assembly is actuated when a leakage occurs in the circuit protected by the circuit breaker; or / and, the core assembly is actuated when an overload occurs in the circuit protected by the circuit breaker; or / and, the core assembly is actuated when a short circuit occurs in the circuit protected by the circuit breaker.

[0022] With this structure, the magnetic flux release assembly can be applied to leakage protection, overload protection, and short circuit protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 An exploded view of a circuit breaker according to an embodiment of the present application is shown;

[0025] Figure 2 A cross-sectional view of a circuit breaker according to an embodiment of the present application is shown;

[0026] Figure 3A cross-sectional view showing the installation structure of the circuit breaker operating mechanism according to an embodiment of the present application;

[0027] Figure 4 A schematic diagram showing the actuation of the flux release assembly in the circuit breaker according to the embodiment of the present application is shown;

[0028] Figure 5 A schematic diagram showing a magnetic flux release assembly in a circuit breaker according to an embodiment of the present application when not actuated;

[0029] Figure 6 An exploded view of a flux release assembly in a circuit breaker according to an embodiment of the present application is shown;

[0030] Figure 7 A schematic diagram showing a magnetic flux release assembly in a circuit breaker according to an embodiment of the present application after being reset is shown;

[0031] Figure 8 A schematic diagram showing the actuation of the flux release assembly in the circuit breaker according to the embodiment of the present application is shown;

[0032] Fig. 9 An axial view of a flux release assembly in a circuit breaker according to an embodiment of the present application is shown;

[0033] Fig.10 A three-dimensional diagram of a mounting bracket in a circuit breaker according to an embodiment of the present application is shown;

[0034] Fig.11 A schematic diagram showing the cooperation between the mounting bracket and the electromagnetic mechanism in the circuit breaker of the embodiment of the present application is shown;

[0035] Fig.12 A schematic diagram of a push rod in a circuit breaker according to an embodiment of the present application is shown;

[0036] Fig.13 A cross-sectional view of a flux release assembly in a circuit breaker according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "electrically connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed electrical connection, a detachable electrical connection, or an integrated one; it can be a mechanical electrical connection, or an electrical electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0042] like Figure 1-Figure 13 As shown, an embodiment of the present application is a circuit breaker. The circuit breaker of the present application can be a leakage thermal magnetic circuit breaker, an electronic molded case circuit breaker, a leakage electronic molded case circuit breaker, or even an intelligent circuit breaker such as a measuring switch, a fee-controlled reclosing switch, etc.

[0043] The circuit breaker includes a housing, an operating mechanism 100, a contact system and a flux release assembly 700. The flux release assembly 700 referred to here has the function of pushing the tripping rod 100b of the operating mechanism 100 to move after actuation, so that the operating mechanism 100, which was originally in the closed state, performs an opening operation due to the action of the tripping rod 100b. The reason for the actuation of the flux release assembly 700 may be caused by leakage in the protected line, or by overload, short circuit and other phenomena in the protected line. Of course, the actuation of the flux release assembly 700 referred to here is caused by leakage, overload, short circuit and other phenomena, which does not specifically mean that the flux release assembly 700 of this circuit breaker must have these three protection functions, but the protection functions of the flux release assembly 700 are different for different types of circuit breakers. For example, the function of the flux release assembly 700 of the leakage thermal magnetic circuit breaker is the leakage protection function. For example, in an electronic molded case circuit breaker, the function of the magnetic flux release assembly 700 is overload and short circuit protection. For another example, in a leakage electronic molded case circuit breaker, the function of the magnetic flux release assembly 700 is leakage, overload and short circuit protection.

[0044] The magnetic flux release assembly 700 includes an electromagnetic mechanism and a push rod 701. The electromagnetic mechanism here includes a coil assembly 702a and a core assembly 702b. The coil assembly 702a here includes a skeleton, a coil, a yoke, a permanent magnet and other components, and the core assembly 702b includes a moving iron core, a spring and other components. The coil assembly 702a and the core assembly 702b here are both prior art. When actuated, the coil assembly 702a is energized, and due to the principle of the electromagnet, the magnetic force on the core assembly 702b changes, and finally the core assembly 702b moves under the action of its own spring, thereby actuating.

[0045] Here, from the height direction H of the circuit breaker, the flux release assembly 700 is located above the tripping rod 100b as a whole, and the movement direction F of the core assembly 702b is parallel to the height direction H of the circuit breaker when the electromagnetic mechanism is actuated. The push rod 701 and the core assembly 702b are connected and move synchronously, and this relationship can be achieved by fixing, clamping or abutting the two. The push rod 701 has an actuating portion 701a, and the actuating portion 701a corresponds to the actuated portion 100b0 on the tripping rod 100b, and the movement of the actuating portion 701a can drive the movement of the actuated portion 100b0. Of course, the flux release assembly 700 here is located above the tripping rod 100b as a whole. The tripping rod 100b and the flux release assembly 700 can be located in the same space (for example, on the cover 304, the flux release assembly 700 is located just above the tripping rod 100b), or they can be arranged in different spaces (for example, the tripping rod 100b is located below the cover 304, and the flux release assembly 700 is located above the cover 304, with a cover 304 between the two. In terms of height, the flux release assembly 700 is located above the tripping rod 100b).

[0046] The housing includes a base 303, a cover 304 and an upper cover. The cover 304 is located above the base 303, and the upper cover is located above the housing. The base 303, the cover 304 and the upper cover are fastened with bolts.

[0047] The contact system includes a moving contact 307, a stationary contact 308 and a rotating shaft 200. The moving contact 307 and the stationary contact 308 here are multiple groups, and the specific number of groups is related to the number of poles of the circuit breaker. In this embodiment, it is a three-pole circuit breaker, so the moving contact 307 and the stationary contact 308 are three groups. Here, the stationary contact 308 is arranged in the space formed by the base 303 and the cover 304, and the rotating shaft 200 is used to carry the moving contact 307. The rotating shaft 200 is connected to the lower connecting rod of the operating mechanism 100, and the rotating shaft 200 is rotatably arranged between the base 303 and the cover 304. With the movement of the operating mechanism 100, the rotating shaft 200 can be rotated, thereby realizing the connection and disconnection of the moving contact 307 and the stationary contact 308.

[0048] The specific transmission structure of the operating mechanism 100 is common knowledge in the art. The operating mechanism 100 here includes a frame 100a, which is fixed in the cover body 304, specifically through the fixing bolts 1001 passing through the base 303, the cover body 304 and the frame 100a. In this way, most of the structure of the mechanism (most of the structure is in the frame 100a) can be kept away from the conductive components. The handle 100c of the operating mechanism 100 here is partially beyond the cover body 304, so as to facilitate user operation. The operating mechanism 100 has a closing state and an opening state. In the closing state, it is a state of force balance. In this state, if the tripping rod 100b rotates, the force balance of the operating mechanism 100 will be broken, so that the operating mechanism 100 will perform the opening operation. The actuation of the above flux release assembly 700 is one of the ways to cause the tripping rod 100b to rotate.

[0049] The resetting of the magnetic flux release assembly 700 is achieved through the operating mechanism 100. Specifically, the operating mechanism 100 has a reset rod 100e, and the push rod 701 has a reset portion 701b0. When the operating mechanism 100 is re-engaged, the reset rod 100e will generate a displacement in the height direction H of the circuit breaker. Because of this displacement, the reset rod 100e can push the reset portion 701b0 to reset. Specifically, the handle 100c and the lever 100d of the operating mechanism 100 are fixed, the lever 100d and the frame 100a are rotatably arranged, the reset rod 100e is penetrated on the lever 100d and rotates with the lever 100d, and the reset rod 100e penetrates the arc groove on the frame 100a. During the rotation of the lever 100d, the reset rod 100e also rotates, so that a displacement can be generated in the height direction H of the circuit breaker, and the rotation of the reset rod 100e is used to drive the push rod 701 to reset.

[0050] Here, the push rod 701 includes a first barrel portion 701b, which is a hollow structure and has a first opening 701c. The first barrel portion 701b is sleeved on the electromagnetic mechanism through the first opening 701c. The iron core assembly 702b here abuts against the inner wall of the first barrel portion 701b. When the electromagnetic mechanism here is actuated, the iron core assembly 702b moves upward. Here, the actuating portion 701a is connected to the first barrel portion 701b and extends downward to the bottom of the passive portion 100b0. Here, a plane above the first barrel portion 701b is the reset portion 701b0, and the reset rod 100e can act on the reset portion 701b0 to achieve reset.

[0051] The magnetic flux release assembly 700 is fixed to the cover body 304, and is fixed here by the mounting bracket 703. The mounting bracket 703 and the cover body 304 are fastened by bolts. Of course, in addition to bolts, they can also be fixed by a clamping method, or a combination of bolts and clamping methods. There is a second barrel portion 703a on the mounting bracket 703. The second barrel portion 703a is also a hollow structure, and it has a second opening 703b. The second barrel portion 703a here is also used to place the electromagnetic mechanism, specifically the coil assembly 702a of the electromagnetic mechanism. Since the size of the second barrel portion 703a is smaller than the first barrel portion 701b, the electromagnetic mechanism is first placed in the second barrel portion 703a during installation, and then the first barrel portion 701b is sleeved. After installation, from the radial direction R of the electromagnetic mechanism (the direction perpendicular to the actuation direction of the electromagnetic mechanism), the second barrel portion 703a is located between the coil assembly 702a and the first barrel portion 701b.

[0052] In order to improve stability, a hook 703c is provided near the second opening 703b of the second barrel portion 703a, and the hook 703c can just hook the coil assembly 702a. The mounting bracket 703 has a avoidance hole 703d near the second barrel portion 703a, and the avoidance hole 703d here is also to allow the actuator 701a to pass through and cooperate with the passive portion 100b0. At the same time, a vent hole 703e is also provided on the second barrel portion 703a, so that the air resistance when the electromagnetic mechanism is placed can be reduced, which is convenient for assembly.

[0053] The circuit breaker to which the above-mentioned flux release assembly 700 is applied is not limited to the circuit breaker in which the operating mechanism 100 is installed above the cover 304, but can also be applied to the circuit breaker in which the operating mechanism 100 is installed on the base.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A flux release assembly, characterized in that: It includes a mounting bracket, a push rod and an electromagnetic mechanism; the electromagnetic mechanism includes a coil assembly and an iron core assembly; the coil assembly is fixed to the mounting bracket, and the iron core assembly is slidably arranged relative to the coil assembly, and the iron core assembly is actuated when the coil assembly is energized; the push rod includes a first barrel portion and an actuating portion, the first barrel portion is a hollow structure and has a first opening, the first barrel portion is sleeved on the periphery of the electromagnetic mechanism through the first opening, and the inner wall of the first barrel portion is stuck or abutted against the iron core assembly; the actuating portion is connected to one side of the first barrel portion.

2. A flux release assembly according to claim 1, characterized in that: From the height direction of the electromagnetic mechanism, the mounting bracket is located below the core assembly, the core assembly is actuated in a direction away from the mounting bracket, and the actuating portion extends directly below the mounting bracket.

3. A magnetic flux release assembly according to claim 1 or 2, characterized in that: The mounting bracket is provided with a second cylindrical portion, which is a hollow structure and has a second opening. The second cylindrical portion is sleeved on the outside of the coil assembly, and the second cylindrical portion is at least partially covered by the first cylindrical portion; the coil assembly is fixed to the mounting bracket through the second cylindrical portion.

4. A flux release assembly according to claim 3, characterized in that: Regardless of whether the core assembly is actuated or not, there is always an overlapping portion between the first cylindrical portion and the second cylindrical portion in the height direction of the electromagnetic mechanism.

5. A flux release assembly according to claim 3, characterized in that: The coil assembly is fixed to the second cylinder through a barb, and the barb is located near the second opening.

6. A flux release assembly according to claim 3, characterized in that: The second cylinder portion is provided with a through hole; or / and, the mounting bracket is provided with an avoidance hole, the avoidance hole being used for the actuator to pass through.

7. A circuit breaker, comprising an operating mechanism, a contact system and a housing, wherein the operating mechanism is used to drive the contact system to move; characterized in that: It also includes a flux release assembly as described in any one of claims 1 to 6; the operating mechanism includes a tripping rod and a reset rod, the tripping rod is provided with a passive part, the actuating part corresponds to the passive part, and after the core assembly is actuated, the actuating part drives the passive part to move, so that the operating mechanism performs a tripping operation; during the re-tripping process of the operating mechanism, the reset rod acts on the push rod to reset the electromagnetic mechanism.

8. A circuit breaker according to claim 7, characterized in that: The operating mechanism comprises a handle, a lever and a frame, the handle is fixed to the lever, and the lever and the frame are rotatably arranged; the reset rod is a part of the lever or the reset rod is fixed to the lever or the reset rod is a part of the handle or the reset rod is fixed to the handle.

9. A circuit breaker according to claim 7, characterized in that: The shell comprises a base, a cover body and an upper cover; the cover body is arranged on the base, the upper cover is arranged on the cover body, the contact system is arranged in the space formed by the cover body and the base, and the mounting bracket is fixed on the side of the cover body facing the upper cover.

10. The circuit breaker according to any one of claims 7 to 9, characterized in that: The core assembly is actuated when a leakage occurs in the circuit protected by the circuit breaker; or / and, the core assembly is actuated when an overload occurs in the circuit protected by the circuit breaker; or / and, the core assembly is actuated when a short circuit occurs in the circuit protected by the circuit breaker.

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