Thermomagnetic assembly and circuit breaker

Abstract

The embodiment of the utility model provides a thermomagnetic assembly and a circuit breaker, and relates to the field of power equipment. The thermomagnetic assembly comprises a support, an electromagnetic part and a bimetallic part. The support comprises a first magnet yoke part and a fixing part which are fixedly connected with each other, the magnetic piece is connected to the first magnet yoke part and surrounded by the first magnet yoke part, the bimetal piece is connected to the fixing part, and the electromagnetic piece and the bimetal piece are both used for being connected to a main loop of the circuit breaker. The electromagnetic part is used for generating electromagnetic force to disconnect the main loop when the current of the main loop reaches a first threshold value. And the bimetallic piece is used for deforming to break the main loop when the temperature of the bimetallic piece reaches a second threshold value. In the thermomagnetic assembly, the electromagnetic piece and the bimetallic piece form an integral module through the bracket, so that the installation difficulty of the thermomagnetic assembly is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of power equipment, and particularly to a thermal magnetic component and a circuit breaker. Background Art

[0002] As a key device in the power system, a circuit breaker can cut off the circuit in time when the circuit is severely overloaded or short-circuited, ensuring the safe and stable operation of the power system. A thermal magnetic component is provided in the circuit breaker to disconnect the circuit through thermal tripping and magnetic tripping mechanisms, ensuring the safety of the circuit.

[0003] In the thermal magnetic component, at least electromagnetic components such as electromagnetic coils are provided, which can cut off the circuit through electromagnetic force when the circuit is short-circuited, thereby realizing magnetic tripping to protect the circuit. A bimetallic component is also provided in the thermal magnetic component, which can deform to cut off the circuit when the circuit is overloaded for a long time, thereby realizing thermal tripping to protect the circuit.

[0004] Since there are many components in the existing thermal magnetic component, and there may be direct or indirect cooperation relationships between multiple components, therefore, there are often position accuracy requirements between the components, and operators need to separately adjust the relative positions of each component to ensure the normal use of the components with cooperation relationships. This installation process depends on the experience of the operator, and if the adjustment is not in place, rework is required. The installation process is complex, difficult, and not user-friendly. Therefore, how to simplify the assembly difficulty of the thermal magnetic component has become a technical problem to be solved. Summary of the Utility Model

[0005] In view of the above problems, the embodiments of the present application provide a thermal magnetic component. The thermal magnetic component forms an integral module for the electromagnetic component and the bimetallic component through a bracket, eliminating the need for separately adjusting the relative positions of the electromagnetic component and the bimetallic component, simplifying the installation process of the thermal magnetic component, and reducing the installation difficulty of the thermal magnetic component. The embodiments of the present application also simultaneously provide a circuit breaker including such a thermal magnetic component.

[0006] In one aspect of the embodiments of the present application, a thermal magnetic component is provided, which is applied to a circuit breaker. The thermal magnetic component includes: a bracket, an electromagnetic component, and a bimetallic component. The bracket includes a first yoke portion and a fixing portion that are fixedly connected to each other. The electromagnetic component is connected to the first yoke portion and surrounded by the first yoke portion, and the bimetallic component is connected to the fixing portion. Both the electromagnetic component and the bimetallic component are used to access the main circuit of the circuit breaker. The electromagnetic component is configured to generate an electromagnetic force to disconnect the main circuit when the current in the main circuit reaches a first threshold. The bimetallic component is configured to deform to disconnect the main circuit when its own temperature reaches a second threshold.

[0007] This kind of thermal-magnetic component enables the electromagnetic component and the bimetallic component to form an integral module under the connection of the bracket, so that the relative position adjustment between the electromagnetic component and the bimetallic component is completed when they are installed on the bracket, without the need to separately adjust the relative position between the electromagnetic component and the bimetallic component after installing them on the housing of the circuit breaker, thus simplifying the installation process of the thermal-magnetic component and reducing the installation difficulty of the thermal-magnetic component.

[0008] In some optional ways, the electromagnetic component includes: an electromagnetic coil and a static iron core. The electromagnetic coil and the static iron core are surrounded by the first yoke part, and the electromagnetic coil is sleeved around the periphery of the static iron core; the electromagnetic coil is used to generate an electromagnetic force to disconnect the main circuit when the current in the main circuit reaches the first threshold.

[0009] The structure in which the electromagnetic coil and the static iron core cooperate with each other is convenient for installation, and the electromagnetic coil is convenient for disassembly, replacement and position adjustment.

[0010] In some optional ways, the first yoke part includes a yoke end plate and a yoke side plate that form an angle with each other; the yoke end plate is opposite to the end of the electromagnetic coil, and the yoke side plate is opposite to the outer periphery of the electromagnetic coil.

[0011] The first yoke part with this kind of structure is convenient for processing and installation.

[0012] In some optional ways, the fixing part includes a fixing platform, the fixing platform is parallel to the yoke end plate, and the fixed end of the bimetallic component is connected to the fixing platform, so that the bimetallic component and the electromagnetic component are fixed side by side.

[0013] The bimetallic component and the electromagnetic component are fixed side by side, making the overall structure of the thermal-magnetic component more regular, reducing the occupied space of the thermal-magnetic component, and also facilitating the alignment installation of the electromagnetic component and the bimetallic component.

[0014] In some optional ways, the bracket further includes a second yoke part, the second yoke part is connected to the first yoke part, and the electromagnetic component is surrounded between the second yoke part and the first yoke part.

[0015] In this kind of structure, the structures of the various components are simple, the processing is convenient, and the alignment installation is facilitated.

[0016] In some optional ways, a groove is provided on the fixing platform, and the fixed end of the bimetallic component is embedded in the groove and connected to the fixing platform.

[0017] The provision of the groove can provide relatively accurate positioning for the bimetallic component, so that after the fixed end of the bimetallic component is embedded in the groove, it is separated from the fixed position of the electromagnetic component by the required distance, thereby accurately positioning the relative position between the bimetallic component and the electromagnetic component through the structure of the bracket itself, and reducing the difficulty of position adjustment between the bimetallic component and the electromagnetic component.

[0018] In some alternative ways, the first yoke portion and the second yoke portion are snap-connected to each other.

[0019] In this connection method, the first yoke portion and the second yoke portion are easy to connect, the assembly is more convenient, and the reliability of the connection can be ensured.

[0020] In some alternative ways, the fixed end of the bimetallic part is welded to the fixed platform.

[0021] Welding the fixed end of the bimetallic part to the fixed platform can ensure the stability of the connection of the bimetallic part.

[0022] On the other hand, an embodiment of the present application provides a circuit breaker, which includes a moving contact, a static contact, and a thermal-magnetic component as described in any one of the foregoing. The moving contact, the static contact, the bimetallic part in the thermal-magnetic component, and the electromagnetic part in the thermal-magnetic component are connected in series to turn on the main circuit of the circuit breaker when the moving contact and the static contact are in contact, and to turn off the main circuit of the circuit breaker when the moving contact and the static contact are separated. At least part of the moving contact is within the actuation range of the bimetallic part and the electromagnetic part, so that the moving contact is driven to separate from the static contact under the electromagnetic force of the electromagnetic part or under the deformation of the bimetallic part.

[0023] In this kind of circuit breaker, the electromagnetic part and the bimetallic part in the thermal-magnetic component form an integral module through the bracket. When installing the thermal-magnetic component, it only needs to be installed on the housing of the circuit breaker, with low installation difficulty and convenient assembly.

[0024] In some alternative ways, the circuit breaker further includes a housing. The moving contact, the static contact, and the thermal-magnetic component are all installed in the housing. A slot is provided on the housing, and the bracket includes an insertion part, and the insertion part is inserted into the slot to fix the thermal-magnetic component on the housing.

[0025] Inserting the insertion part of the bracket into the slot can realize the assembly of the thermal-magnetic component, and the installation process is simple. Moreover, only by ensuring the accuracy of the docking position of the insertion part and the slot, the assembly accuracy of the thermal-magnetic component can be ensured, the positioning of the thermal-magnetic component is more convenient, and the difficulty of position adjustment during installation is reduced.

[0026] In some alternative ways, a protrusion is provided on the insertion part, and the protrusion abuts against the side wall of the slot so that the slot tightly presses the insertion part through the protrusion.

[0027] The protrusion can make the insertion part stuck in the slot, so that the insertion part can be reliably fixed after being inserted into the slot.

[0028] In the thermal magnetic component and the circuit breaker provided by the embodiments of the present application, the electromagnetic component and the bimetallic component are respectively mounted on the bracket, so that the electromagnetic component and the bimetallic component form an integral module through the bracket, and only need to be mounted on the housing of the circuit breaker. Moreover, when the electromagnetic component and the bimetallic component are mounted on the bracket, the adjustment of the relative positions between the two is completed, and there is no need to separately adjust the relative positions of the electromagnetic component and the bimetal after mounting them on the housing of the circuit breaker, thereby simplifying the installation process of the thermal magnetic component and reducing the installation difficulty of the thermal magnetic component.

[0029] 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 illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a single-group thermal magnetic component provided by an embodiment of the present application.

[0032] Figure 2 It is a schematic structural diagram of a single-group thermal magnetic component provided with a second yoke portion according to an embodiment of the present application.

[0033] Figure 3 It is a schematic structural diagram of a multi-group thermal magnetic component provided by an embodiment of the present application.

[0034] Figure 4 It is a schematic structural diagram of the first yoke portion and the fixing portion of a thermal magnetic component provided by an embodiment of the present application.

[0035] Figure 5 It is a schematic structural diagram of the second yoke portion of a thermal magnetic component provided by an embodiment of the present application.

[0036] Figure 6 It is a schematic partial structural diagram of a circuit breaker provided with a thermal magnetic component according to an embodiment of the present application.

[0037] Figure 7 It is a schematic structural diagram of a housing provided with a slot according to an embodiment of the present application.

[0038] Reference numerals:

[0039] 10. Bracket; 11. First yoke part; 111. Yoke end plate; 112. Yoke side plate; 113. Protrusion; 114. First card slot; 115. First card block; 116. Insertion positioning surface

[0040] 12. Fixing part; 121. Fixing platform; 122. Groove

[0041] 13. Second yoke part; 131. Second card slot; 132. Second card block

[0042] 20. Electromagnetic component; 21. Electromagnetic coil; 22. Static iron core; 23. Moving iron core; 30. Bimetallic part

[0043] 40. Static contact plate; 41. Static contact; 50. Moving contact plate; 51. Moving contact

[0044] 60. Housing; 61. Slot Detailed implementation manner

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application

[0047] The terms "including" and "having" and any variations thereof in the specification, claims, and drawings of this application are intended to cover but not exclude other content. The word "a" or "an" does not exclude the presence of a plurality

[0048] 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 this application. The phrase "embodiments" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments

[0049] In this document, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, both A and B exist simultaneously, and B exists alone. Additionally, in this document, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0050] The orientation terms used in the following description are the directions shown in the figures, and do not limit the specific structures of the thermomagnetic component and the circuit breaker of this application. For example, in the description of this application, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application.

[0051] In addition, expressions indicating directions such as the X direction, Y direction, and Z direction used to explain the operations and structures of the components of the thermomagnetic component and the circuit breaker in this embodiment are not absolute but relative. Although these indications are appropriate when the components of the thermomagnetic component and 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.

[0052] In addition, terms such as "first", "second", etc. in the description, claims, or the above-mentioned drawings of this application 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.

[0053] In the description of this 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).

[0054] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, the "connection" or "coupling" of mechanical structures can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection through a fixing member, such as a screw, a bolt, or other fixing members; a physical connection can also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. The "connection" or "coupling" of circuit structures can refer to not only a physical connection but also an electrical connection or a signal connection. For example, it can be a direct connection, that is, a physical connection, or it can be indirectly connected through at least one intermediate element, as long as the circuit is connected; it can also be the communication inside two components; in addition to a signal connection through a circuit, a signal connection can also refer to a signal connection through a media medium, such as radio waves. 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.

[0055] The first embodiment of the present application provides a thermal-magnetic component applied to a circuit breaker. The thermal-magnetic component is as Figure 1 , Figure 2 and Figure 3 shown, Figure 1 is a schematic structural diagram of a single-group thermal-magnetic component provided by an embodiment of the present application, Figure 2 is a schematic structural diagram of a single-group thermal-magnetic component provided by an embodiment of the present application, which is provided with a second yoke portion, Figure 3 is a schematic structural diagram of a multi-group thermal-magnetic component provided by an embodiment of the present application. Among them, the thermal-magnetic component includes a bracket 10, an electromagnetic component 20, and a bimetallic component 30.

[0056] The bracket 10 is a framework for providing installation positions and supports for components such as the electromagnetic component 20 and the bimetallic component 30. The bracket 10 specifically includes a first yoke portion 11 and a fixing portion 12 that are fixedly connected to each other. The first yoke portion 11 and the fixing portion 12 can be fixedly connected to each other by means such as welding, riveting, or integral molding.

[0057] The first yoke portion 11 is used to install the electromagnetic component 20. The first yoke portion 11 is usually made of a high-permeability material, such as iron or an iron alloy, etc., to optimize the magnetic field distribution of the electromagnetic component 20 and enhance the electromagnetic effect, and thus obtain an ideal electromagnetic force. The fixing portion 12 is used to support and fix the bimetallic component 30, and its structure is set corresponding to the structure of the bimetallic component 30.

[0058] The electromagnetic component 20 is connected to the first yoke part 11 and surrounded by the first yoke part 11, the bimetallic component 30 is connected to the fixed part 12, and both the electromagnetic component 20 and the bimetallic component 30 are used to access the main circuit of the circuit breaker. The main circuit refers to the circuit formed by the contact system of the circuit breaker, and the main circuit of the circuit breaker is specifically controlled by the static contact and the moving contact of the circuit breaker. That is, when the static contact and the moving contact are in contact, the main circuit is connected. When the static contact and the moving contact are separated, the main circuit is disconnected.

[0059] The electromagnetic component 20 is used to generate electromagnetic force to disconnect the main circuit when the current of the main circuit reaches the first threshold value. Specifically, when the main circuit is connected and works normally, the electromagnetic force generated by the electromagnetic component 20 is small and will not drive the moving contact 51 away from the static contact 41. At this time, the main circuit is always connected to make the circuit breaker work normally. When a short circuit occurs in the main circuit, the current of the main circuit increases to the first threshold value. For example, when the short-circuit current reaches 13 times the rated current, the electromagnetic force generated by the electromagnetic component 20 increases and drives the moving contact 51 away from the static contact 41, thereby disconnecting the main circuit and achieving short-circuit protection.

[0060] The electromagnetic member 20 may be composed of multiple parts, such as Figure 2 As shown, it mainly includes an electromagnetic coil 21 and a static iron core 22. The electromagnetic coil 21 and the static iron core 22 are surrounded by the first magnetic yoke part 11, and the electromagnetic coil 21 is sleeved on the outer periphery of the static iron core 22. The electromagnetic coil 21 is used to generate electromagnetic force when the current of the main circuit reaches the first threshold value. The structure in which the electromagnetic coil 21 and the static iron core 22 cooperate with each other is convenient for installation, and the electromagnetic coil 21 is convenient for disassembly, replacement and position adjustment. The electromagnetic component 20 can also include a moving iron core 23, which is located in the electromagnetic field of the electromagnetic coil 21, and the moving iron core 23 can be connected to the moving contact 51 through a tripping rod and other devices, so that when the current of the main circuit reaches the first threshold value, the moving iron core 23 moves under the action of the electromagnetic force generated by the electromagnetic coil 21, and drives the moving contact 51 away from the static contact 41, thereby disconnecting the main circuit and achieving short-circuit protection.

[0061] The bimetallic member 30 is formed by laminating two metal sheets with different thermal expansion coefficients, one end of which is a fixed end, which is fixedly connected to the fixing portion 12 of the bracket 10. The other end of the bimetallic member 30 is a free end, which can be displaced when the bimetallic member 30 is deformed.

[0062] The bimetallic part 30 is used to deform when its own temperature reaches the second threshold to disconnect the main circuit. Specifically, when the main circuit is connected and working properly, the current passing through the bimetallic part 30 is small, and the temperature rise of the bimetallic part is not obvious. Therefore, the bimetallic part 30 will not deform or the amount of deformation generated is small, so it will not affect the moving contact, and the main circuit is always connected to make the circuit breaker work properly. When the main circuit is overloaded for a long time, although the current of the main circuit does not reach the current value at short circuit, the current value of the main circuit is still larger than the rated current. For example, the overload current will reach 1.2 to 1.25 times the rated current. At this time, the overall temperature of the bimetallic part 30 will gradually rise until the second threshold. Since the bimetallic part 30 is composed of two metal sheets with different coefficients of thermal expansion laminated together, when the temperature rises to the second threshold, the elongation amounts of the two metal sheets are different, resulting in the bimetallic part 30 bending and deforming, and the free end of the bimetallic part 30 generating displacement, thereby triggering the thermal tripping mechanism of the circuit breaker, driving the moving contact 51 away from the static contact 41, disconnecting the main circuit, and realizing overload protection.

[0063] In this embodiment, the electromagnetic part 20 is connected to the first yoke part 11, and the bimetallic part 30 is connected to the fixing part 12. The specific connection methods include fixed connections such as welding and bonding, and can also include detachable connections such as snap connections and threaded connections. However, it should be noted that when the electromagnetic part 20 is connected to the first yoke part 11 and the bimetallic part 30 is connected to the fixing part 12, before disassembling them, the electromagnetic part 20 is fixed relative to the first yoke part 11, and the bimetallic part 30 is fixed relative to the fixing part 12, so that the electromagnetic part 20 and the bimetallic part 30 installed on the bracket 10 are relatively fixed, so that the electromagnetic part 20 and the bimetallic part 30 form an integral module under the connection of the bracket 10. When the electromagnetic part 20 and the bimetallic part 30 are installed on the bracket 10, the relative position adjustment between the two is completed, and there is no need to separately adjust the relative position between the electromagnetic part 20 and the bimetal after installing them on the housing of the circuit breaker, thus simplifying the installation process of the thermal magnetic component and reducing the installation difficulty of the thermal magnetic component.

[0064] In this embodiment, the first yoke part 11 in the bracket 10 is used to surround the electromagnetic part 20, which can be semi-surrounding or full-surrounding to optimize the magnetic field distribution of the electromagnetic part 20 and enhance the electromagnetic effect. There are many specific implementation ways to surround the electromagnetic part 20 by the first yoke part 11, and the following is an example for illustration.

[0065] In the first specific implementation way, the electromagnetic part 20 can be only surrounded by the first yoke part 11. For example, the first yoke part 11 is set as a U-shaped structure or a C-shaped structure, etc., so that the two end plates of the first yoke part 11 are located at both ends of the electromagnetic part 20, thereby optimizing the magnetic field distribution of the electromagnetic part 20 and enhancing the electromagnetic effect. This implementation way has fewer parts and fewer installation steps.

[0066] In the second specific implementation manner, it can be as Figure 2 shown that the first yoke portion 11 cooperates with other yoke structures to jointly enclose the electromagnetic component 20. For example, the bracket 10 further includes a second yoke portion 13. The second yoke portion 13 is connected to the first yoke portion 11 and encloses the electromagnetic component 20 between the second yoke portion 13 and the first yoke portion 11. Specifically, the first yoke portion 11 can be set as an L-shaped structure, and the second yoke portion 13 can also be set as an L-shaped structure, etc., so that the second yoke portion 13 and the first yoke portion 11 are combined to enclose the electromagnetic component 20, thereby optimizing the magnetic field distribution of the electromagnetic component 20 and enhancing the electromagnetic effect. In this implementation manner, the structures of the components are simple, the processing is convenient, and the alignment and installation are facilitated. Among them, the first yoke portion 11 and the second yoke portion 13 can be clamped with each other. Specifically, as Figure 2 , Figure 4 and Figure 5 shown, Figure 4 is a schematic structural diagram of the first yoke portion and the fixing portion of a thermomagnetic assembly provided by an embodiment of the present application, Figure 5 is a schematic structural diagram of the second yoke portion of a thermomagnetic assembly provided by an embodiment of the present application.

[0067] Among them, as Figure 4 and Figure 5 shown, a first card slot 114 and a first card block 115 are provided on the first yoke portion 11, a second card slot 131 and a second card block 132 are provided on the second yoke portion 13, the first card block 115 is inserted into the second card slot 131, and the second card block 132 is inserted into the first card slot 114, so that the first yoke portion 11 and the second yoke portion 13 are clamped with each other and enclose the electromagnetic component 20 as Figure 2 shown.

[0068] There are many setting methods for the specific shapes of the yoke portions. For example, they can be set as bent plate-like structures or other structural forms such as columnar shapes. Taking the first yoke portion 11 as an example, a feasible implementation manner is as Figure 4 shown. The first yoke portion 11 at least includes a yoke end plate 111 and a yoke side plate 112 that form an angle with each other. The yoke end plate 111 faces the end of the electromagnetic coil 21, and the yoke side plate 112 faces the outer periphery of the electromagnetic coil 21. The first yoke portion 11 of this structural form is convenient for processing and installation.

[0069] There are also many structural forms of the fixing portion 12 in the bracket 10, and its purpose is to fix the fixed end of the bimetallic member 30 and ensure the relative position accuracy between the bimetallic member 30 and the electromagnetic component 20. The fixing portion 12 can also be set as a plate-like structure or other structural forms, which are not limited herein.

[0070] The fixing part 12 and the first yoke part 11 can be fixedly connected by means of welding, bonding, integral molding, etc. to ensure the stable connection between the fixing part 12 and the first yoke part 11. In a feasible implementation manner, when the first yoke part 11 includes a yoke end plate 111 and a yoke side plate 112 that form an angle with each other, a certain surface on the yoke side plate 112 can be used as a positioning surface to fixedly connect the fixing part 12. For example, the adjacent surface of the side of the yoke side plate 112 facing away from the electromagnetic component 20 can be used as the positioning surface, which can be determined according to specific requirements and is not limited herein.

[0071] Moreover, in order to facilitate the alignment and installation of the electromagnetic component 20 and the bimetallic component 30 and reduce the occupied space of the thermal magnetic assembly, the overall structure of the thermal magnetic assembly can be made more regular. For example, the electromagnetic component 20 and the bimetallic component 30 can be fixedly arranged side by side. In a feasible implementation manner, as Figure 4 shown, the fixing part 12 includes a fixing platform 121, the fixing platform 121 is parallel to the yoke end plate 111, and the fixed end of the bimetallic component 30 is connected to the fixing platform 121, so that the bimetallic component 30 and the electromagnetic component 20 are fixedly arranged side by side.

[0072] In a feasible implementation manner, as Figure 4 shown, a groove 122 can be further provided on the fixing platform 121, and the fixed end of the bimetallic component 30 is embedded in the groove 122 and connected to the fixing platform 121. Among them, the setting of the groove 122 can provide a relatively accurate positioning for the bimetallic component 30, so that after the fixed end of the bimetallic component 30 is embedded in the groove 122, it is separated from the fixed position of the electromagnetic component 20 by the required distance. Thus, the relative positions of the bimetallic component 30 and the electromagnetic component 20 are accurately positioned through the structure of the bracket 10 itself, and the difficulty of position adjustment between the bimetallic component 30 and the electromagnetic component 20 is reduced.

[0073] The fixed end of the bimetallic component 30 can be specifically welded to the fixing platform 121 to ensure the stability of the connection. Alternatively, it can also be fixed by means of bonding, etc., which is not limited herein.

[0074] The above first embodiment details the thermal magnetic assembly. The following second embodiment introduces a circuit breaker including the thermal magnetic assembly of the above first embodiment, specifically as Figure 2 and Figure 6 shown, Figure 6 which is a partial structural schematic diagram of a circuit breaker provided with a thermal magnetic assembly according to an embodiment of the present application.

[0075] As Figure 2 and Figure 6As shown in the figure, the circuit breaker includes a moving contact 51, a static contact 41, and any one of the aforementioned feasible thermal-magnetic components. Among them, the moving contact 51 and the static contact 41 are part of the contact system. The moving contact 51 and the static contact 41 are respectively arranged on a moving contact plate 50 and a static contact plate 40, and the moving contact 51 and the static contact 41 are arranged opposite to each other. The moving contact 51 can approach or move away from the static contact 41 as the moving contact plate 50 moves, thereby controlling the on-off of the main circuit.

[0076] The bimetallic part 30 and the electromagnetic part 20 in the thermal-magnetic component are connected to the main circuit of the circuit breaker. Specifically, the moving contact 51, the static contact 41, the bimetallic part 30 in the thermal-magnetic component, and the electromagnetic part 20 in the thermal-magnetic component are connected in series, so that when the moving contact 51 and the static contact 41 are in contact, the main circuit passing through the circuit breaker is turned on, and when the moving contact 51 and the static contact 41 are separated, the main circuit passing through the circuit breaker is turned off.

[0077] Among them, the part of the electromagnetic part 20 that is specifically connected in series with the above other components can be the electromagnetic coil 21 of the electromagnetic part 20. The electromagnetic part 20 generates an electromagnetic force to disconnect the main circuit when the current in the main circuit reaches the first threshold, and the bimetallic part 30 deforms to disconnect the main circuit when its own temperature reaches the second threshold, thereby realizing short-circuit protection and overload protection.

[0078] At least part of the moving contact 51 is within the actuation range of the bimetallic part 30 and the electromagnetic part 20, so that the moving contact 51 is driven by the electromagnetic force of the electromagnetic part 20 or the deformation of the bimetallic part 30 to separate from the static contact 41, thereby disconnecting the main circuit.

[0079] At least part of the moving contact 51 being within the actuation range of the bimetallic part 30 and the electromagnetic part 20 means that the moving contact 51 can change its motion state under the deformation of the bimetallic part 30 and the electromagnetic action of the electromagnetic part 20, so as to approach or move away from the static contact 41.

[0080] In a specific implementation manner, a moving iron core 23 can be arranged in the electromagnetic part 20 to sense the electromagnetic force. A transmission connection can be established between the moving iron core 23 and the moving contact 51 through a tripping rod or other devices, so that the moving contact 51 can be driven by the electromagnetic force of the electromagnetic part 20 to move away from the static contact 41 when the main circuit is short-circuited, so that the moving contact 51 is within the actuation range of the electromagnetic part 20. For the bimetallic part 30, a thermal tripping mechanism such as a lever or a connecting rod can be used to establish a transmission connection between the free end of the bimetallic part 30 and the moving contact 51, so that the moving contact 51 can be driven by the deformation of the bimetallic part 30 to move away from the static contact 41 when the main circuit is overloaded, so that the moving contact 51 is within the actuation range of the bimetallic part 30.

[0081] In this circuit breaker, the electromagnetic component 20 and the bimetallic component 30 in the thermal-magnetic component form an integral module through the bracket 10. When installing the thermal-magnetic component, it only needs to be installed on the housing 60 of the circuit breaker, with low installation difficulty and convenient assembly. There are many specific installation methods, such as plugging, clamping, bolt connection, etc.

[0082] Taking the plugging installation method as an example, a feasible implementation is as Figure 7 shown. Figure 7 It is a schematic structural diagram of a housing provided with a slot in an embodiment of the present application. Among them, the moving contact 51, the static contact 41 and the thermal-magnetic component are all installed in the housing 60. The housing 60 is provided with a slot 61, and the bracket 10 includes an insertion part, and the insertion part is inserted into the slot 61 to fix the thermal-magnetic component on the housing 60.

[0083] In this implementation, only by inserting the insertion part of the bracket 10 into the slot 61 can the assembly of the thermal-magnetic component be realized, and the installation process is simple. Moreover, only by ensuring the accuracy of the docking position of the insertion part and the slot 61 can the assembly accuracy of the thermal-magnetic component be ensured. The positioning of the thermal-magnetic component is more convenient, and the difficulty of position adjustment during installation is reduced.

[0084] In this implementation, there are many configuration methods for the insertion part. For example, the insertion part can be configured as the yoke side plate 112 of the first yoke part 11. During installation, only the yoke side plate 112 needs to be aligned with the slot 61 and inserted. Moreover, the side of the yoke side plate 112 facing away from the fixing part 12 can be further set as a plugging positioning surface 116 with higher machining accuracy, and the plugging positioning surface 116 is docked with the high-precision docking surface in the slot 61, and then the yoke side plate 112 is inserted into the slot 61 to complete the positioning installation, further reducing the positioning difficulty and improving the assembly accuracy. Or, the insertion part can also be configured as other parts of the bracket 10, which is not limited here.

[0085] Furthermore, in order to reliably fix the insertion part after it is inserted into the slot 61, it can be as Figure 4 shown. A protruding part 113 is provided on the insertion part, and the protruding part 113 can abut against the side wall of the slot 61, so that the slot 61 fixes the insertion part by abutting against the protruding part 113, thereby fixing the electromagnetic component. For example, when the insertion part is configured as the yoke side plate 112 of the first yoke part 11, the protruding part 113 can be arranged on the adjacent surface of the side of the yoke side plate 112 facing away from the electromagnetic component 20, so as to facilitate the abutment of the protruding part 113 against the side wall of the slot 61.

[0086] The specific structure of the thermal-magnetic component in this circuit breaker corresponds to the thermal-magnetic component in the foregoing embodiment. For the specific structure setting method, please refer to the introduction of any embodiment related to the thermal-magnetic component. Similar parts will not be described in detail in this embodiment.

[0087] In summary, in the thermomagnetic component and the circuit breaker described above, the electromagnetic component and the bimetallic component are respectively mounted on the bracket, so that the electromagnetic component and the bimetallic component form an integral module through the bracket, and only need to be mounted on the housing of the circuit breaker. Moreover, the relative positions of the electromagnetic component and the bimetallic component are adjusted when they are mounted on the bracket, and there is no need to separately adjust the relative positions of the electromagnetic component and the bimetallic component after they are mounted on the housing of the circuit breaker, thereby simplifying the installation process of the thermomagnetic component and reducing the installation difficulty of the thermomagnetic component.

[0088] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A thermomagnetic component, applied to a circuit breaker, characterized in that, The thermomagnetic component includes: a bracket, an electromagnetic component, and a bimetallic component; The bracket includes a first yoke portion and a fixing portion that are fixedly connected to each other; the electromagnetic component is connected to the first yoke portion and surrounded by the first yoke portion, and the bimetallic component is connected to the fixing portion; both the electromagnetic component and the bimetallic component are used to be connected to the main circuit of the circuit breaker; The electromagnetic component is configured to generate an electromagnetic force to disconnect the main circuit when the current in the main circuit reaches a first threshold; the bimetallic component is configured to deform to disconnect the main circuit when its own temperature reaches a second threshold.

2. The thermomagnetic component according to claim 1, wherein The electromagnetic component includes: an electromagnetic coil and a static iron core; The electromagnetic coil and the static iron core are surrounded by the first yoke portion, and the electromagnetic coil is sleeved around the periphery of the static iron core; the electromagnetic coil is configured to generate an electromagnetic force when the current in the main circuit reaches a first threshold.

3. The thermomagnetic component according to claim 2, characterized in that, The first yoke portion includes a yoke end plate and a yoke side plate that form an angle with each other; the yoke end plate faces the end of the electromagnetic coil, and the yoke side plate faces the outer periphery of the electromagnetic coil.

4. The thermomagnetic component according to claim 3, wherein The fixing portion includes a fixing platform that is parallel to the yoke end plate, and the fixed end of the bimetallic component is connected to the fixing platform, such that the bimetallic component and the electromagnetic component are fixedly arranged side by side.

5. The thermomagnetic component according to claim 1, characterized in that The bracket further includes a second yoke portion that is connected to the first yoke portion and encloses the electromagnetic component between the second yoke portion and the first yoke portion.

6. The thermomagnetic component according to claim 4, characterized in that A groove is provided on the fixing platform, and the fixed end of the bimetallic component is embedded in the groove and connected to the fixing platform.

7. The thermomagnetic component according to claim 5, characterized in that, The first yoke portion and the second yoke portion are snap-connected to each other.

8. A circuit breaker, characterized in that, The circuit breaker includes a moving contact, a static contact, and the thermomagnetic component according to any one of claims 1-7; The moving contact, the static contact, the bimetallic component in the thermomagnetic component, and the electromagnetic component in the thermomagnetic component are connected in series to connect the main circuit of the circuit breaker when the moving contact and the static contact are in contact, and to disconnect the main circuit of the circuit breaker when the moving contact and the static contact are separated; At least a part of the moving contact is located within the actuation range of the bimetallic component and the electromagnetic component, such that the moving contact is driven to separate from the static contact under the action of the electromagnetic force of the electromagnetic component or the deformation of the bimetallic component.

9. The circuit breaker according to claim 8, characterized in that, The circuit breaker further includes a housing; the moving contact, the static contact, and the thermomagnetic component are all installed in the housing; A slot is provided on the housing, and the bracket includes an insertion portion that is inserted into the slot to fix the thermomagnetic component to the housing.

10. The circuit breaker according to claim 9, characterized in that, A protrusion is provided on the insertion portion, and the protrusion abuts against the side wall of the slot, such that the slot tightly presses the insertion portion through the protrusion.

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