Electromagnetic release structure and circuit breaker
By setting heat insulation ribs on the outer wall of the core assembly of the circuit breaker to contact the inner wall of the coil, the problem of deformation of the core assembly due to excessive heat transfer is solved, and the electromagnetic characteristics of the circuit breaker are maintained.
Patent Information
- Application Number
- CN202420609918.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-27
AI Technical Summary
In existing circuit breakers, the core component is in direct contact with the coil, causing excessive heat transfer, causing deformation of the core component and affecting electromagnetic characteristics.
The outer wall of the core assembly is provided with heat insulation ribs to make them abut with the inner wall of the coil, reducing the contact area between the core assembly and the coil, thereby reducing heat transfer.
The structural deformation of the core assembly due to overheating is effectively avoided, and the electromagnetic characteristics of the circuit breaker are maintained.
Smart Images
Figure CN222600888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to an electromagnetic release structure and a circuit breaker. Background Art
[0002] In the field of low-voltage electrical appliances, circuit breakers can realize circuit on-off control, current carrying, and protection of lines and electrical equipment. When abnormal current appears in the circuit, the circuit breaker configured in the line will activate the internal action mechanism according to the changes in electrical parameters or thermal parameters, and cut off the power line in time to protect electrical equipment and lines.
[0003] The electromagnetic release structure in the circuit breaker includes an iron core assembly and a coil assembly. In the prior art, when the iron core assembly and the coil assembly are assembled, the iron core assembly is inserted into the coil of the coil assembly and is fitted with the coil. This structure causes the heat generated by the coil to be directly transferred to the iron core assembly. After long-term use, the iron core assembly will be deformed by the heat, which will affect the electromagnetic characteristics of the circuit breaker. Utility Model Content
[0004] The utility model aims to provide an electromagnetic release structure and a circuit breaker, which can prevent the iron core component from being deformed due to heat.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The electromagnetic release structure includes:
[0007] The core assembly has an outer wall provided with heat-insulating ribs extending along the axial direction of the core assembly;
[0008] The coil assembly comprises a yoke support and a coil, wherein the core assembly is inserted into the coil and connected to the yoke support, and the heat insulation rib abuts against the inner wall of the coil so that there is a gap between the outer wall of the core assembly and the inner wall of the coil.
[0009] As an optional scheme for the electromagnetic release structure, two thermal insulation ribs are provided, and the two thermal insulation ribs are arranged at intervals on the outer wall of the core assembly, and the two thermal insulation ribs abut the inner wall of the coil along a first direction, and the yoke bracket is used to limit the core assembly in a second direction so that the core assembly is centered in the coil; the first direction, the second direction and the axial direction of the core assembly are perpendicular to each other.
[0010] As an optional scheme for the electromagnetic release structure, the yoke bracket includes a first limit plate and a second limit plate arranged at intervals along the axial direction of the core assembly, and the first limit plate and the second limit plate are respectively provided with a first limit notch and a second limit notch on one side along the first direction, and the core assembly is sequentially passed through the first limit notch, the coil and the second limit notch, and the inner walls of the first limit notch and the second limit notch on both sides along the second direction abut against the outer wall of the core assembly.
[0011] As an optional solution for the electromagnetic release structure, the first limiting notch is provided with a guide groove, and one of the heat-insulating ribs facing the first limiting notch is plugged into the guide groove.
[0012] As an optional scheme for the electromagnetic release structure, the iron core assembly includes a coil frame and a static iron core, the static iron core is arranged at one end of the coil frame, and a limiting portion is arranged on the outer wall of the coil frame away from the static iron core. The static iron core is arranged in the second limiting notch and abuts against the second limiting plate, and the limiting portion is clamped on the first limiting plate.
[0013] As an optional scheme of the electromagnetic release structure, the limiting part includes a limiting mounting plate and a limiting buckle, the limiting mounting plate is arranged on the outer wall of the coil frame, the limiting buckle is fixedly arranged on the limiting mounting plate, and the limiting buckle is clamped to the first limiting plate.
[0014] As an optional solution for the electromagnetic release structure, two limiting portions are provided, and the two limiting portions are arranged on the outer wall of the coil skeleton along the second direction.
[0015] As an optional solution for the electromagnetic release structure, in the direction from the first limiting plate to the second limiting plate, the width of the thermal insulation rib along the second direction gradually decreases.
[0016] As an optional solution for the electromagnetic release structure, the outer wall of the core assembly is further provided with a limit reinforcing plate, and the shell arranged outside the electromagnetic release structure can press the limit reinforcing plate against the coil.
[0017] A circuit breaker comprises a housing and an electromagnetic release structure as described in any one of the above schemes, wherein the electromagnetic release structure is arranged in the housing.
[0018] Beneficial effects of the utility model:
[0019] The utility model provides an electromagnetic release structure, which arranges heat-insulating ribs on the outer wall of the core assembly, and the heat-insulating ribs can abut against the inner wall of the coil, thereby reducing the contact area between the core assembly and the coil, thereby reducing the influence of the coil heat on the core assembly, and effectively avoiding the problem of structural deformation of the core assembly due to overheating. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the assembly structure of the electromagnetic release structure provided by the embodiment of the utility model;
[0021] Figure 2 The explosion of the electromagnetic release structure provided by the embodiment of the utility model Figure 1 ;
[0022] Figure 3 The explosion of the electromagnetic release structure provided by the embodiment of the utility model Figure 2 .
[0023] In the figure:
[0024] 1. Iron core assembly; 11. Coil skeleton; 111. Heat insulation rib; 112. Position limiting mounting plate; 113. Position limiting buckle; 114. Position limiting reinforcing plate; 12. Moving iron core; 13. Static iron core; 14. Ejector rod;
[0025] 2. Coil assembly; 21. Yoke bracket; 211. First limiting plate; 2111. First limiting notch; 2111a. Guide groove; 212. Second limiting plate; 2121. Second limiting notch; 213. Intermediate connecting plate; 22. Coil; 221. First extension portion; 222. Second extension portion; 23. Static contact; 24. Contact plate. DETAILED DESCRIPTION
[0026] The embodiments of the present invention 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 components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection 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 the present invention can be understood according to specific circumstances.
[0028] In the description of the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0029] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0030] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides an electromagnetic release structure, including a core assembly 1 and a coil assembly 2. Among them, the outer wall of the core assembly 1 is provided with a heat insulation rib 111, and the heat insulation rib 111 extends along the axial direction of the core assembly 1 (i.e., the X axis); the coil assembly 2 includes a yoke bracket 21 and a coil 22, the core assembly 1 is inserted into the coil 22, and is connected to the yoke bracket 21, and the heat insulation rib 111 can abut against the inner wall of the coil 22 to avoid direct abutment between the outer wall of the core assembly 1 and the inner wall of the coil 22, so that there is a gap between the outer wall of the core assembly 1 and the inner wall of the coil 22, which can effectively reduce the heat transfer of the coil 22 to the core assembly 1.
[0031] The electromagnetic release structure is provided with heat-insulating ribs 111 on the outer wall of the core assembly 1. The heat-insulating ribs 111 can abut against the inner wall of the coil 22, thereby reducing the contact area between the core assembly 1 and the coil 22, thereby reducing the effect of the heat of the coil 22 on the core assembly 1, and effectively avoiding the problem of structural deformation of the core assembly 1 due to overheating.
[0032] Specifically, the core assembly 1 includes a coil skeleton 11, a moving iron core 12, a stationary iron core 13, a reaction spring and a push rod 14. The moving iron core 12 is arranged at one end of the coil skeleton 11, and the stationary iron core 13 is arranged at the other end of the coil skeleton 11. The reaction spring is arranged in the coil skeleton 11 and is located between the moving iron core 12 and the stationary iron core 13. The push rod 14 passes through the stationary iron core 13 and the reaction spring and is connected to the moving iron core 12. The insulation rib 111 is arranged on the outer wall of the coil skeleton 11.
[0033] Specifically, the coil assembly 2 also includes a stationary contact 23 and a contact plate 24 , a first extension portion 221 at one end of the coil 22 is welded to the stationary contact 23 , a second extension portion 222 at the other end is welded to the contact plate 24 , and a yoke bracket 21 is welded to the stationary contact 23 .
[0034] Alternatively, if Figure 2-Figure 3 As shown, two heat-insulating ribs 111 are provided, and the two heat-insulating ribs 111 are circumferentially arranged on the outer wall of the coil skeleton 11, and the two heat-insulating ribs 111 are symmetrically distributed along the first direction (i.e., the Y axis). When the core assembly 1 is inserted into the coil 22 and connected to the yoke bracket 21, the two heat-insulating ribs 111 abut against the inner wall of the coil 22 along the first direction, so that the coil skeleton 11 is centered in the coil 22 along the first direction; the yoke bracket 21 can limit the core assembly 1 in the second direction (i.e., the Z axis), so that the coil skeleton 11 is centered in the coil 22 along the second direction; and the first direction, the second direction and the axial direction of the core assembly 1 are perpendicular to each other. This structure enables the core assembly 1 to be centered in the coil 22 in both the first direction and the second direction, avoiding direct abutment between the outer wall of the coil skeleton 11 and the inner wall of the coil 22, reducing heat transfer, and effectively avoiding the problem of deformation of the coil skeleton 11 due to overheating.
[0035] Specifically, the yoke bracket 21 includes an intermediate connecting plate 213, a first limiting plate 211 and a second limiting plate 212. The first limiting plate 211 and the second limiting plate 212 are spaced apart at both ends of the intermediate connecting plate 213 along the axial direction of the core assembly 1. The first limiting plate 211 and the second limiting plate 212 are parallel to each other, and the first limiting plate 211 and the second limiting plate 212 are respectively provided with a first limiting notch 2111 and a second limiting notch on one side along the first direction. The first limiting notch 2111 and the second limiting notch 2121 are both semicircular structures. The core assembly 1 is sequentially inserted into the first limiting notch 2111 of the first limiting plate 211, the coil 22 and the second limiting notch 2121 of the second limiting plate 212. The inner walls of the first limiting notch 2111 and the second limiting notch 2121 on both sides along the second direction abut against the outer wall of the coil skeleton 11. The yoke bracket 21 realizes the limitation of the coil skeleton 11 in the second direction.
[0036] In order to limit the core assembly 1 in the circumferential direction, a guide groove 2111a is provided in the first limiting notch 2111 of the first limiting plate 211, and an insulation rib 111 facing the first limiting notch 2111 can be plugged into the guide groove 2111a to limit the rotation of the coil frame 11 of the core assembly 1.
[0037] Optionally, a limiting portion is provided on the outer wall of the coil skeleton 11 on the side away from the static iron core 13, the iron core assembly 1 is sequentially inserted into the first limiting notch 2111 of the first limiting plate 211, the coil 22, and the second limiting notch 2121 of the second limiting plate 212, the heat insulation rib 111 is simultaneously inserted into the guide groove 2111a, the static iron core 13 is arranged in the second limiting notch 2121 of the second limiting plate 212, and the static iron core 13 is in contact with the second limiting plate 212, and the limiting portion is clamped to the first limiting plate 211. This structure realizes the clamping and fixing of the coil skeleton 11 and the yoke bracket 21.
[0038] Specifically, Figure 2 Combined with Figure 1 As shown, the limiting part includes a limiting mounting plate 112 and a limiting buckle 113. The limiting mounting plate 112 is arranged on the outer wall of the coil frame 11, and the limiting buckle 113 is arranged on the limiting mounting plate 112. When the core assembly 1 is inserted into the coil assembly 2, the limiting mounting plate 112 is located at the opening position of the first limiting notch 2111 of the first limiting plate 211, and the limiting buckle 113 is clamped on the side of the first limiting plate 211 facing the second limiting plate 212. This structure enables the limiting part to automatically clamp on the first limiting plate 211 after the core assembly 1 is inserted into the first limiting notch 2111 of the first limiting plate 211, the coil 22, and the second limiting notch 2121 of the second limiting plate 212 in the axial direction of the core assembly 1, so that the installation is more convenient.
[0039] The limit buckle 113 is provided with an inclined surface, which gradually rises from the static iron core 13 to the moving iron core 12. This structure makes it smoother for the limit buckle 113 to be connected to the first limit plate 211 and can effectively prevent the limit buckle 113 from falling out.
[0040] Optionally, two limiting parts are provided, and the limiting mounting plates 112 of the two limiting parts are provided on the outer wall of the coil skeleton 11 along the second direction, and the two limiting buckles 113 are respectively provided on the two limiting mounting plates 112, and the two limiting buckles 113 are respectively clamped on both sides of the first limiting plate 211 along the second direction, so that the clamping is more firm.
[0041] Preferably, the width of the thermal insulation rib 111 along the second direction gradually decreases from the first limiting plate 211 to the second limiting plate 212. When the width of the thermal insulation rib 111 connected to the guide groove 2111a along the second direction gradually decreases, the width of the end of the thermal insulation rib 111 close to the static iron core 13 is smaller than the width of the guide groove 2111, so that the thermal insulation rib 111 can be inserted into the guide groove 2111a more conveniently. In addition, the width of the thermal insulation rib 111 gradually increases from the second limiting plate 212 to the first limiting plate 211, so that the thermal insulation rib 111 and the guide groove 2111a are more tightly plugged in, thereby effectively preventing the core assembly 1 from rotating.
[0042] The coil frame 11 is a plastic part, which is manufactured by an injection molding process.
[0043] A circuit breaker is also provided in an embodiment of the utility model, including a shell and the above-mentioned electromagnetic release structure, the electromagnetic release structure is arranged in the shell, and the shell can press the coil skeleton 11 of the core assembly 1 against the second extension portion 222 of the coil 22, so that after the core assembly 1 is assembled into the shell, the shell can further limit the core assembly 1, making the installation more secure.
[0044] The circuit breaker is provided with the electromagnetic release structure provided in this embodiment, so as to effectively prevent the core assembly 1 from overheating and causing thermal deformation.
[0045] Reference Figure 2 A limiting reinforcement plate 114 is provided on the outer wall of the coil skeleton 11 of the core assembly 1 near the moving iron core 12, and the limiting reinforcement plate 114 extends along the second direction. When the core assembly 1 is inserted into the coil 22, one end of the limiting reinforcement plate 114 abuts against the second extension portion 222 of the coil 22. After the electromagnetic release structure is assembled into the shell, the shell abuts against the other end of the limiting reinforcement plate 114 to fix the coil skeleton 11, thereby fixing the core assembly 1 in the shell.
[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. The electromagnetic release structure is characterized by: include: An iron core assembly (1), the outer wall of which is provided with heat-insulating ribs (111) extending along the axial direction of the iron core assembly (1); The coil assembly (2) comprises a yoke support (21) and a coil (22); the core assembly (1) is inserted into the coil (22) and connected to the yoke support (21); the heat insulating rib (111) abuts against the inner wall of the coil (22) so that a gap exists between the outer wall of the core assembly (1) and the inner wall of the coil (22).
2. The electromagnetic release structure according to claim 1, characterized in that: Two thermal insulation ribs (111) are provided, and the two thermal insulation ribs (111) are arranged at intervals on the outer wall of the core assembly (1), and the two thermal insulation ribs (111) abut against the inner wall of the coil (22) along a first direction. The yoke bracket (21) is used to limit the core assembly (1) in a second direction so that the core assembly (1) is centrally arranged in the coil (22); the first direction, the second direction and the axial direction of the core assembly (1) are perpendicular to each other.
3. The electromagnetic release structure according to claim 2, characterized in that: The yoke bracket (21) comprises a first limiting plate (211) and a second limiting plate (212) which are arranged at intervals along the axial direction of the core assembly (1); the first limiting plate (211) and the second limiting plate (212) are respectively provided with a first limiting notch (2111) and a second limiting notch (2121) on one side along the first direction; the core assembly (1) is sequentially inserted into the first limiting notch (2111), the coil (22) and the second limiting notch (2121); the inner walls of the first limiting notch (2111) and the second limiting notch (2121) on both sides along the second direction abut against the outer wall of the core assembly (1).
4. The electromagnetic release structure according to claim 3, characterized in that: The first limiting notch (2111) is provided with a guide groove (2111a), and one of the heat insulating ribs (111) facing the first limiting notch (2111) is plugged into the guide groove (2111a).
5. The electromagnetic release structure according to claim 3, characterized in that: The core assembly (1) comprises a coil frame (11) and a static core (13), wherein the static core (13) is arranged at one end of the coil frame (11), and a limiting portion is arranged on the outer wall of the coil frame (11) on a side away from the static core (13), and the static core (13) is arranged in the second limiting notch (2121) and abuts against the second limiting plate (212), and the limiting portion is clamped on the first limiting plate (211).
6. The electromagnetic release structure according to claim 5, characterized in that: The limiting portion comprises a limiting mounting plate (112) and a limiting buckle (113); the limiting mounting plate (112) is arranged on the outer wall of the coil frame (11); the limiting buckle (113) is fixedly arranged on the limiting mounting plate (112); and the limiting buckle (113) is clamped on the first limiting plate (211).
7. The electromagnetic release structure according to claim 5, characterized in that: Two limiting portions are provided, and the two limiting portions are arranged on the outer wall of the coil frame (11) along the second direction.
8. The electromagnetic release structure according to claim 4, characterized in that: In the direction from the first limiting plate (211) to the second limiting plate (212), the width of the thermal insulation rib (111) along the second direction gradually decreases.
9. The electromagnetic release structure according to claim 1, characterized in that: The outer wall of the core assembly (1) is also provided with a limit reinforcing plate (114), and the outer shell arranged outside the electromagnetic release structure can press the limit reinforcing plate (114) against the coil (22).
10. A circuit breaker, characterized in that It comprises a shell and the electromagnetic release structure according to any one of claims 1 to 9, wherein the electromagnetic release structure is arranged in the shell.