Electromagnetic system

Abstract

The utility model belongs to low -voltage electric appliance technical field discloses an electromagnetic system. The electromagnetic system includes insulating plate, static contact, contact plate, bimetallic strip, electric heating material, coil framework support and electromagnetic coil structure, fixes static contact, contact plate and coil framework support in insulating plate, and fixes bimetallic strip in coil framework support, guarantees the stability of bimetallic strip installation, connects the both ends of electric heating material with static contact and contact plate respectively, then current flows through static contact, electric heating material, the coil of electromagnetic coil structure and contact plate in proper order, and current does not flow through bimetallic strip, and the heat generated when current flows through electric heating material acts on bimetallic strip through heat conduction mode, and makes bimetallic strip heat bending, can guarantee the stability of bimetallic strip installation, cancels the welding between original bimetallic strip and electric heating material, effectively promotes the stability and reliability of motor starter operation.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an electromagnetic system. Background Technology

[0002] An electric motor starter is used for infrequent starting of an electric motor and provides overload and short-circuit protection. An electric motor starter typically includes a thermo-electromagnetic system and an operating mechanism. When the motor is overloaded, the bimetallic strip in the thermo-electromagnetic system is heated and bent, which in turn drives the operating mechanism to perform a tripping action. When a short-circuit current occurs, the iron core in the thermo-electromagnetic system is activated by electromagnetic force to trip the motor, thus protecting it.

[0003] In existing technologies, thermo-magnetic systems typically involve directly welding the heating material to the bimetallic strip. Current flows from the stationary contact through the heating material and the bimetallic strip, directly energizing and heating the bimetallic strip. However, welding can damage the bimetallic strip, causing differences in the resistivity of the three-phase bimetallic strips. This directly affects the synchronicity of the three-phase bimetallic strips' operation and reduces the operational reliability of the motor starter.

[0004] Therefore, there is an urgent need to provide an electromagnetic system to solve the problem of the direct welding of electrothermal materials and bimetallic strips affecting the synchronization of actions, thereby improving the stability and reliability of operation. Utility Model Content

[0005] The purpose of this invention is to provide an electromagnetic system that solves the problem of the direct welding of electrothermal materials and bimetallic strips affecting the synchronization of actions, thereby improving the stability and reliability of operation.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides an electromagnetic system, including an insulating plate, a stationary contact, a contact plate, a bimetallic strip, an electrothermal material, a coil frame support, and an electromagnetic coil structure. The stationary contact, the contact plate, and the coil frame support are all fixed to the insulating plate. The electromagnetic coil structure is located at one end of the coil frame support, and the bimetallic strip is fixed to the other end of the coil frame support. The electrothermal material is insulated from and tightly attached to the bimetallic strip. The stationary contact is connected to one end of the electrothermal material, and the other end of the electrothermal material is connected to the contact plate via a coil through the electromagnetic coil structure. The electrothermal material is energized to heat the bimetallic strip through heat conduction.

[0008] As an optional technical solution for an electromagnetic system, the insulating plate includes an insulating pad and an insulating support plate. The coil frame bracket is fixed to the insulating support plate. The insulating support plate is located between the insulating pad and the coil frame bracket. The insulating support plate is connected to the insulating pad through the stationary contact. The contact plate is partially engaged with the insulating support plate and fixed to the insulating pad to restrict the relative movement of the insulating pad and the insulating support plate.

[0009] As an optional technical solution for an electromagnetic system, the insulating support plate has a first slot and a second slot that are connected to each other. The first slot extends along a first direction, and the second slot extends along a second direction. The contact plate is inserted into the first slot and the second slot. The portion of the contact plate extending outside the second slot is connected to the coil, and the portion of the contact plate extending outside the first slot is fixed to the insulating pad.

[0010] As an optional technical solution for an electromagnetic system, the insulating support plate has an opening on a third-direction side, the opening being connected to both the first slot and the second slot, the opening being used for inserting the contact plate, and the coil being connected to the contact plate at the portion of the coil frame bracket extending from the third-direction side away from the opening.

[0011] As an optional technical solution for an electromagnetic system, the stationary contact includes a first segment, a second segment, a third segment, and a fourth segment connected in sequence. The second segment and the fourth segment are parallel and spaced apart along the first direction, and the first segment and the third segment are parallel and spaced apart along the second direction. The insulating pad is inserted between the first segment and the third segment along the first direction and abuts against the second segment. A stationary contact is provided on the side of the first segment away from the third segment.

[0012] The insulating support plate is provided with a connected bottom slot and a side slot. The third segment is inserted into the bottom slot along the first direction, and the fourth segment is inserted into the side slot along the second direction. The fourth segment extends out of the side slot and is fixedly connected to the electrothermal material.

[0013] As an optional technical solution for an electromagnetic system, the side slot is connected to the first slot, the contact plate is provided with a notch, the fourth segment and part of the insulating support plate are inserted into the notch along a third direction, and the fourth segment does not contact the notch.

[0014] As an optional technical solution for an electromagnetic system, the coil frame support includes a main support, a positioning plate, and a mounting plate. The mounting plate is connected to the main support through the positioning plate. The main support is fixed to the insulating plate. The electromagnetic coil structure is disposed on the main support. The bimetallic strip is fixed to the mounting plate.

[0015] As an optional technical solution for an electromagnetic system, the insulating plate is provided with at least two positioning protrusions, which pass through the main bracket and are engaged with the main bracket.

[0016] As an optional technical solution for an electromagnetic system, the insulating plate is provided with a positioning slot, and the positioning plate is partially inserted into the positioning slot; and / or, the mounting plate is provided with a socket, and the bimetallic strip is inserted and welded to the socket.

[0017] As an optional technical solution for an electromagnetic system, the electrothermal material includes a first plate and a second plate connected at their top ends. The bottom end of the first plate is bent to form a first welding end, and the bottom end of the second plate is bent to form a second welding end. The first plate is insulated from and tightly attached to the bimetallic strip. An insulating sleeve is provided over the first plate, the second plate, and the bimetallic strip. The first welding end passes through the insulating sleeve and is connected to the stationary contact, and the second welding end passes through the insulating sleeve and is connected to the coil.

[0018] Beneficial effects:

[0019] This utility model provides an electromagnetic system, which includes an insulating plate, a stationary contact, a contact plate, a bimetallic strip, an electrothermal material, a coil frame support, and an electromagnetic coil structure. The stationary contact, the contact plate, and the coil frame support are all fixed to the insulating plate. An electromagnetic coil structure is provided at one end of the coil frame support, and the bimetallic strip is fixed to the other end of the coil frame support. The electrothermal material is insulated from the bimetallic strip and is tightly attached to it. The stationary contact is connected to one end of the electrothermal material, and the other end of the electrothermal material is connected to the contact plate through the coil of the electromagnetic coil structure. The electrothermal material is energized to heat the bimetallic strip through heat conduction. The stationary contact, contact plate, and coil frame support are all fixed to the insulating plate, and the bimetallic strip is fixed to the coil frame support to ensure the stability of the bimetallic strip installation. The two ends of the heating material are connected to the stationary contact and the contact plate respectively. Then the current flows sequentially through the stationary contact, the heating material, the coil of the electromagnetic coil structure, and the contact plate. Since the heating material is insulated from the bimetallic strip and is installed in close contact, the current does not flow through the bimetallic strip. The heat generated when the current flows through the heating material acts on the bimetallic strip through thermal conduction, causing the bimetallic strip to bend due to heat. This not only ensures the stability of the bimetallic strip installation, but also eliminates the original welding between the bimetallic strip and the heating material, preventing the resistivity difference caused by welding from affecting the synchronization of the three-phase bimetallic strip operation, and effectively improving the stability and reliability of the motor starter operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the electromagnetic system (hidden insulating sleeve) provided in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the insulating pad and stationary contact provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the insulating support plate and the stationary contact provided in this embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the insulating support plate provided in this embodiment of the utility model;

[0024] Figure 5 This is a first-view structural schematic diagram of the insulating support plate and contact plate provided in an embodiment of this utility model;

[0025] Figure 6 This is a structural schematic diagram of the insulating support plate and contact plate provided in an embodiment of the present invention from a second perspective;

[0026] Figure 7 This is a schematic diagram of the structure of the insulating support plate, contact plate and stationary contact provided in the embodiment of this utility model;

[0027] Figure 8 This is a schematic diagram of the structure of the coil frame support provided in this embodiment of the utility model;

[0028] Figure 9 This is a schematic diagram of the structure of the insulating support plate, stationary contact, contact plate, bimetallic strip and coil frame support provided in the embodiment of this utility model;

[0029] Figure 10 This is a schematic diagram of the structure of the electrothermal material provided in this embodiment of the utility model;

[0030] Figure 11 This is a partial structural schematic diagram of the electromagnetic system provided in an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the electromagnetic system provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Insulating board; 11. Insulating pad; 12. Insulating support plate; 121. First slot; 122. Second slot; 123. Bottom slot; 124. Side slot; 125. Positioning protrusion; 126. Positioning slot;

[0034] 2. Stationary contact; 21. First segment; 22. Second segment; 23. Third segment; 24. Fourth segment;

[0035] 3. Contact plate; 31. Notch;

[0036] 4. Bimetallic strip;

[0037] 5. Heating material; 511. First plate; 512. Second plate; 52. First welding end; 53. Second welding end;

[0038] 6. Coil frame bracket; 61. Main bracket; 62. Positioning plate; 63. Mounting plate; 631. Socket;

[0039] 7. Electromagnetic coil structure; 71. Coil; 72. Coil frame; 73. Moving iron core;

[0040] 8. Insulating sleeve. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] like Figure 1 As shown, this embodiment provides an electromagnetic system, which includes an insulating plate 1, a stationary contact 2, a contact plate 3, a bimetallic strip 4, an electrothermal material 5, a coil frame support 6, and an electromagnetic coil structure 7. The stationary contact 2, the contact plate 3, and the coil frame support 6 are all fixed to the insulating plate 1. One end of the coil frame support 6 is provided with the electromagnetic coil structure 7, and the bimetallic strip 4 is fixed to the other end of the coil frame support 6. The electrothermal material 5 is insulated from the bimetallic strip 4 and is tightly attached to it. The stationary contact 2 is connected to one end of the electrothermal material 5, and the other end of the electrothermal material 5 is connected to the contact plate 3 via a coil 71 passing through the electromagnetic coil structure 7. The electrothermal material 5 is energized to heat the bimetallic strip 4 through heat conduction.

[0046] The stationary contact 2, contact plate 3, and coil frame support 6 are all fixed to the insulating plate 1, and the bimetallic strip 4 is fixed to the coil frame support 6 to ensure the stability of the bimetallic strip 4 installation. The two ends of the heating material 5 are connected to the stationary contact 2 and the contact plate 3 respectively. Then the current flows sequentially through the stationary contact 2, the heating material 5, the coil 71 of the electromagnetic coil structure 7, and the contact plate 3. Since the heating material 5 is insulated from the bimetallic strip 4 and is installed in close contact, the current does not flow through the bimetallic strip 4. The heat generated when the current flows through the heating material 5 acts on the bimetallic strip 4 through heat conduction, causing the bimetallic strip 4 to bend due to heat. This not only ensures the stability of the bimetallic strip 4 installation, but also eliminates the original welding between the bimetallic strip 4 and the heating material 5, preventing the difference in resistivity caused by welding from affecting the synchronization of the three-phase bimetallic strip 4, and effectively improving the stability and reliability of the motor starter operation.

[0047] Meanwhile, the direct welding of the original heating material to the bimetallic strip introduces residual stress during the welding process due to annealing near the weld point. Even without external energy input, this residual stress redistributes and releases locally over time, leading to fluctuations in the bimetallic strip's material properties. This instability can easily cause characteristic drift and even functional failure. Furthermore, in high-current products, direct heating of the bimetallic strip can result in excessively high overall temperature rise, leading to performance degradation, shortened lifespan, and safety hazards. This embodiment uses an independently heated heating material 5, with heat transferred to the bimetallic strip 4 via thermal conduction. This ensures the bimetallic strip 4 is not damaged, effectively avoids the problem of residual welding stress, reduces overall temperature rise, and guarantees starter performance.

[0048] Furthermore, the insulating plate 1 includes an insulating pad 11 and an insulating support plate 12. The coil frame support 6 is fixed to the insulating support plate 12. The insulating support plate 12 is located between the insulating pad 11 and the coil frame support 6. The insulating support plate 12 is connected to the insulating pad 11 through a stationary contact 2. The contact plate 3 is partially locked onto the insulating support plate 12. The contact plate 3 is fixed to the insulating pad 11 to restrict the relative movement of the insulating pad 11 and the insulating support plate 12.

[0049] The insulating plate 1 is designed as two separate parts: an insulating pad 11 and an insulating support plate 12. The insulating support plate 12 is connected to the insulating pad 11 via a stationary contact 2. A coil frame support 6 is fixed on the insulating support plate 12, which is located between the insulating pad 11 and the coil frame support 6. A contact plate 3 is then snapped onto the insulating support plate 12. After the contact plate 3 is fixed to the insulating pad 11, it restricts the movement of the insulating support plate 12 relative to the insulating pad 11 and indirectly restricts the stationary contact 2, thereby ensuring the accuracy of the installation position of the insulating support plate 12 and the stationary contact 2. This facilitates the installation of other components and solves the problem of the complex structure and difficult processing of an integrated insulating plate. The electromagnetic system also includes an insulating base. The insulating pad 11 is fixed to the insulating base, and the contact plate 3 is fixed to the insulating pad 11 or fixed to the insulating base together with the insulating pad 11.

[0050] See Figures 1 to 3 The stationary contact 2 includes a first segment 21, a second segment 22, a third segment 23 and a fourth segment 24 connected in sequence. The second segment 22 and the fourth segment 24 are parallel and spaced apart along a first direction. The first segment 21 and the third segment 23 are parallel and spaced apart along a second direction. An insulating pad 11 is inserted between the first segment 21 and the third segment 23 along the first direction and abuts against the second segment 22. A stationary contact is provided on the side of the first segment 21 away from the third segment 23.

[0051] In this embodiment, the insulating pad 11 is sandwiched between the first segment 21 and the third segment 23 and its end abuts against the second segment 22; the insulating support plate 12 is located above the third segment 23 and is connected to the third segment 23 and the fourth segment 24, and the fourth segment 24 is connected to the electrothermal material 5.

[0052] In this embodiment, the Y direction is the first direction, the Z direction is the second direction, and the X direction is the third direction; the second segment 22 and the fourth segment 24 both extend along the Z direction, and the first segment 21 and the third segment 23 both extend along the Y direction. The insulating pad 11 and the stationary contact 2 are inserted and connected along the Y direction. The insulating pad 11 is provided with grooves corresponding to the first segment 21 and the third segment 23. When the insulating pad 11 is inserted between the first segment 21 and the third segment 23, the first segment 21 and the third segment 23 are respectively inserted into the corresponding grooves on the upper and lower sides of the insulating pad 11.

[0053] See Figure 1 , Figures 3 to 5 The insulating support plate 12 has a first slot 121 and a second slot 122 that are connected. The first slot 121 extends along the Y direction and the second slot 122 extends along the Z direction. The contact plate 3 is inserted into the first slot 121 and the second slot 122. The part of the contact plate 3 extending outside the second slot 122 is connected to the coil 71, and the part of the contact plate 3 extending outside the first slot 121 is fixed to the insulating pad 11.

[0054] In this embodiment, the insulating support plate 12 is connected to the insulating pad 11 via the stationary contact 2. Under the restriction of the stationary contact 2, the insulating support plate 12 can only move relative to the insulating pad 11 in the Y direction. When the contact plate 3 is inserted into the first slot 121 and the second slot 122 in the X direction, and the contact plate 3 and the insulating pad 11 are fixed, the contact plate 3 cannot move relative to the insulating pad 11. Under the restriction of the first slot 121, the contact plate 3 and the insulating support plate 12 cannot move relative to each other in the Z direction. Under the restriction of the second slot 122, the contact plate 3 and the insulating support plate 12 also cannot move relative to each other in the Y direction, thereby ensuring that the insulating support plate 12 and the stationary contact 2 are stably fixed on the insulating pad 11.

[0055] See Figure 1 , Figure 6 and Figure 7 The insulating support plate 12 is provided with a bottom slot 123 and a side slot 124 that are connected. The third segment 23 is inserted into the bottom slot 123 along the Y direction, and the fourth segment 24 is inserted into the side slot 124 along the Z direction. The fourth segment 24 extends out of the side slot 124 and is fixedly connected to the heating material 5.

[0056] In this embodiment, the bottom of the third segment 23 of the stationary contact 2 is inserted into the insulating pad 11 along the Y direction, and the top of the third segment 23 is inserted into the bottom slot 123 of the insulating support plate 12 along the Y direction. The insulating support plate 12 and the insulating pad 11 are spaced apart along the Z direction. The fourth segment 24 of the stationary contact 2 is inserted into the side slot 124 along the Z direction.

[0057] A bottom slot 123 and a side slot 124 are provided on the insulating support plate 12. The third segment 23 of the stationary contact 2 is inserted into the bottom slot 123 along the Y direction, and the fourth segment 24 is inserted into the side slot 124 along the Z direction. This can further restrict the relative movement of the stationary contact 2 and the insulating support plate 12 along the Y direction, ensuring the firmness of the installation.

[0058] Optionally, the side slot 124 and the first slot 121 are connected, and the contact plate 3 is provided with a notch 31. The fourth segment 24 of the stationary contact 2 and part of the insulating support plate 12 are inserted into the notch 31 along the X direction, and the fourth segment 24 does not contact the notch 31.

[0059] A notch 31 is designed on the contact plate 3, and the stationary contact 2 and part of the insulating support plate 12 are inserted into the notch 31 along the X direction. This can further restrict the relative movement of the stationary contact 2 and the insulating support plate 12 with the contact plate 3 in the Y direction, ensuring the accuracy of the position of the stationary contact 2 and the insulating support plate 12. Since the fourth segment 24 is inserted into the side slot 124 of the insulating support plate 12, the insulating support plate 12 can separate the fourth segment 24 from the contact plate 3, and the fourth segment 24 will not contact the surface of the notch 31.

[0060] See Figure 4 , Figure 8 and Figure 9 The coil frame support 6 includes a main support 61, a positioning plate 62 and a mounting plate 63. The mounting plate 63 is connected to the main support 61 through the positioning plate 62. The main support 61 is fixed to the insulating plate 1. The electromagnetic coil structure 7 is set on the main support 61 and the bimetallic strip 4 is fixed to the mounting plate 63.

[0061] Optionally, the insulating support plate 12 is provided with at least two positioning protrusions 125, which pass through the main bracket 61 and are snapped into the main bracket 61. The insulating support plate 12 and the coil frame bracket 6 are fixed together by the positioning protrusions 125, which has good vibration resistance and does not require additional tools or tightening steps, simplifying the assembly process and helping to save costs.

[0062] Optionally, the insulating support plate 12 is further provided with a positioning slot 126, into which the positioning plate 62 of the coil frame bracket 6 is partially inserted. By providing a positioning slot 126 on the insulating support plate 12 and partially inserting the coil frame bracket 6 into the positioning slot 126, the accuracy of the installation position of the coil frame bracket 6 is further improved.

[0063] In this embodiment, two positioning protrusions 125 are spaced apart along the X direction, and the main bracket 61 is provided with holes corresponding to the positioning protrusions 125; the positioning slot 126 is located on the top of the insulating support plate 12 and extends along the Z direction.

[0064] See Figure 1 and Figure 8 The electromagnetic coil structure 7 includes a coil 71, a coil frame 72, and a moving iron core 73. The coil frame 72 is fixed on the main support 61, the coil 71 is wound on the coil frame 72, and the moving iron core 73 is disposed inside the coil frame 72 and can move along the axial direction of the coil frame 72. When the coil 71 is energized, it generates a magnetic field, which is transmitted to the moving iron core 73 through the coil frame 72, causing the moving iron core 73 to move, thereby triggering the tripping action.

[0065] Optionally, the mounting plate 63 of the coil frame bracket 6 is provided with a socket 631, and the bimetallic strip 4 is inserted and soldered to the socket 631. The design of the socket 631 ensures that the bimetallic strip 4 and the coil frame bracket 6 can be quickly and accurately positioned, and a firm connection is achieved through soldering.

[0066] See Figure 4 , Figures 10 to 12 The insulating support plate 12 has an opening on one side in the X direction, which communicates with both the first slot 121 and the second slot 122. The opening is used for insertion of the contact plate 3. The portion of the coil 71 extending from the coil frame support 6 in the X direction away from the opening is connected to the contact plate 3. Connecting the portion of the coil 71 extending from the coil frame support 6 in the X direction away from the opening to the contact plate 3 allows the coil frame support 6 and the coil 71 to restrict the movement of the contact plate 3 in the X direction.

[0067] In this embodiment, the portion of coil 71 extending from the coil frame support 6 in the X direction forward is connected to the heating material 5, and the portion extending from the coil frame support 6 in the X direction rearward is connected to the contact plate 3; the heating material 5 is a high-resistivity alloy material. Using a high-resistivity alloy material as the heating material 5 allows for efficient generation of resistance heat due to its high resistivity, and the resistance value remains stable, thus protecting the circuit.

[0068] Furthermore, the heating material 5 includes a first plate portion 511 and a second plate portion 512. The top ends of the first plate portion 511 and the second plate portion 512 are connected. The bottom end of the first plate portion 511 is bent and extended to form a first welding end 52, and the bottom end of the second plate portion 512 is bent to form a second welding end 53. The first plate portion 511 is insulated from and tightly attached to the bimetallic strip 4. An insulating sleeve 8 is provided over the first plate portion 511, the second plate portion 512, and the bimetallic strip 4. The first welding end 52 extends through the insulating sleeve 8 and is connected to the stationary contact 2, and the second welding end 53 extends through the insulating sleeve 8 and is connected to the coil 71. The insulating sleeve 8 is designed to isolate the heating material 5 from the outside, preventing the risk of leakage or short circuit. The insulating sleeve 8 has a low thermal conductivity, which can play a role in heat preservation, preventing heat loss and allowing heat to be transferred to the bimetallic strip 4.

[0069] In this embodiment, the heating material 5 is a folded double-layer sheet structure, with the first plate portion 511 and the second plate portion 512 located in parallel planes. The first welding end 52 is used to weld to the fourth segment 24 of the stationary contact 2, and the second welding end 53 is used to weld to the coil 71.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electromagnetic system, characterized in that, The device includes an insulating plate (1), a stationary contact (2), a contact plate (3), a bimetallic strip (4), an electrothermal material (5), a coil frame support (6), and an electromagnetic coil structure (7). The stationary contact (2), the contact plate (3), and the coil frame support (6) are all fixed to the insulating plate (1). The electromagnetic coil structure (7) is provided at one end of the coil frame support (6). The bimetallic strip (4) is fixed to the other end of the coil frame support (6). The electrothermal material (5) is insulated from and closely attached to the bimetallic strip (4). The stationary contact (2) is connected to one end of the electrothermal material (5). The other end of the electrothermal material (5) is connected to the contact plate (3) through the coil (71) of the electromagnetic coil structure (7). The electrothermal material (5) is energized to heat the bimetallic strip (4) through heat conduction.

2. The electromagnetic system according to claim 1, characterized in that, The insulating plate (1) includes an insulating pad (11) and an insulating support plate (12). The coil frame bracket (6) is fixed to the insulating support plate (12). The insulating support plate (12) is located between the insulating pad (11) and the coil frame bracket (6). The insulating support plate (12) is connected to the insulating pad (11) through the stationary contact (2). The contact plate (3) is partially locked to the insulating support plate (12). The contact plate (3) is fixed to the insulating pad (11) to restrict the relative movement of the insulating pad (11) and the insulating support plate (12).

3. The electromagnetic system according to claim 2, characterized in that, The insulating support plate (12) has a first slot (121) and a second slot (122) that are connected. The first slot (121) extends in a first direction and the second slot (122) extends in a second direction. The contact plate (3) is inserted into the first slot (121) and the second slot (122). The portion of the contact plate (3) extending outside the second slot (122) is connected to the coil (71). The portion of the contact plate (3) extending outside the first slot (121) is fixed to the insulating pad (11).

4. The electromagnetic system according to claim 3, characterized in that, The insulating support plate (12) has an opening on a third-direction side, which communicates with both the first slot (121) and the second slot (122). The opening is for the insertion of the contact plate (3). The coil (71) is connected to the contact plate (3) at the portion of the coil frame bracket (6) extending from the third-direction side away from the opening.

5. The electromagnetic system according to claim 3, characterized in that, The stationary contact (2) includes a first segment (21), a second segment (22), a third segment (23), and a fourth segment (24) connected in sequence. The second segment (22) and the fourth segment (24) are parallel and spaced apart along the first direction. The first segment (21) and the third segment (23) are parallel and spaced apart along the second direction. The insulating pad (11) is inserted between the first segment (21) and the third segment (23) along the first direction and abuts against the second segment (22). A stationary contact is provided on the side of the first segment (21) away from the third segment (23). The insulating support plate (12) is provided with a connected bottom slot (123) and a side slot (124). The third segment (23) is inserted into the bottom slot (123) along the first direction, and the fourth segment (24) is inserted into the side slot (124) along the second direction. The fourth segment (24) extends out of the side slot (124) and is fixedly connected to the electrothermal material (5).

6. The electromagnetic system according to claim 5, characterized in that, The side slot (124) is connected to the first slot (121), and the contact plate (3) is provided with a notch (31). The fourth segment (24) and part of the insulating support plate (12) are inserted into the notch (31) along the third direction, and the fourth segment (24) does not contact the notch (31).

7. The electromagnetic system according to claim 1, characterized in that, The coil frame support (6) includes a main support (61), a positioning plate (62) and a mounting plate (63). The mounting plate (63) is connected to the main support (61) through the positioning plate (62). The main support (61) is fixed to the insulating plate (1). The electromagnetic coil structure (7) is disposed on the main support (61). The bimetallic strip (4) is fixed to the mounting plate (63).

8. The electromagnetic system according to claim 7, characterized in that, The insulating plate (1) is provided with at least two positioning protrusions (125), the positioning protrusions (125) pass through the main bracket (61), and the positioning protrusions (125) are engaged with the main bracket (61).

9. The electromagnetic system according to claim 8, characterized in that, The insulating plate (1) is provided with a positioning slot (126), and the positioning plate (62) is partially inserted into the positioning slot (126); and / or, the mounting plate (63) is provided with a socket (631), and the bimetallic strip (4) is inserted and welded to the socket (631).

10. The electromagnetic system according to any one of claims 1-9, characterized in that, The electrothermal material (5) includes a first plate (511) and a second plate (512) connected at the top. The bottom end of the first plate (511) is bent to form a first welding end (52), and the bottom end of the second plate (512) is bent to form a second welding end (53). The first plate (511) is insulated from and closely attached to the bimetallic strip (4). An insulating sleeve (8) is provided over the first plate (511), the second plate (512) and the bimetallic strip (4). The first welding end (52) passes through the insulating sleeve (8) and is connected to the stationary contact (2). The second welding end (53) passes through the insulating sleeve (8) and is connected to the coil (71).

Images