Mutual inductor and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and particularly discloses a mutual inductor and a circuit breaker. According to the mutual inductor and the circuit breaker provided by the utility model, the heat insulation cavities are arranged in the housing of the mutual inductor, the heat insulation pieces are arranged in the heat insulation cavities, each mutual inductor iron core assembly is correspondingly provided with one heat insulation cavity, the heat insulation pieces of the mutual inductor are arranged towards the inner side of the base of the circuit breaker, and the mutual inductor iron core assemblies are arranged towards the wiring cavity of the base. The wiring cavity is communicated with the external environment, heat generated when the transformer iron core assembly works can be blocked by the heat insulation part, the heat is dissipated to the outside of the circuit breaker through the wiring cavity, then the heat entering the circuit breaker is reduced, the heat dissipation speed of the transformer is increased, the temperature in the circuit breaker is reduced, and the service life of the circuit breaker is prolonged. The heat generated when the mutual inductor works is prevented from influencing the execution of the long-time delay action of the circuit breaker, and the operation stability and safety of the whole electrical system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a mutual inductor and a circuit breaker. Background Art

[0002] In power supply and distribution systems, with increasing demands for intelligent circuit breakers, real-time monitoring of numerous power parameters, such as voltage, current, power factor, and harmonics, is often required. The current approach is to add intelligent control and energy metering capabilities to electronic molded case circuit breakers. This typically requires installing electronic modules such as controllers and communication modules within the circuit breaker. The controller primarily consists of circuit boards and electronic components. Wires connect the circuit breaker's current transformers, metering transformers, temperature sensors, electronic trip units, and other detection circuits to the controller, enabling the controller to collect information, transmit communications, and perform intelligent control of the circuit breaker. This allows the controller to detect operating information such as the circuit breaker's voltage, current, and temperature.

[0003] At present, the heat dissipation effect of the transformer in the circuit breaker is poor. The heat generated by the transformer during operation will affect the circuit breaker's execution of long-delay action, which may cause the circuit breaker to accidentally cut off the power, affecting the operating stability and safety of the entire electrical system. Utility Model Content

[0004] The purpose of the present utility model is to provide a transformer and a circuit breaker, which can dissipate the heat generated by the transformer during operation to the outside of the circuit breaker, thereby reducing the temperature inside the circuit breaker, preventing the heat generated by the transformer during operation from accumulating inside the circuit breaker and affecting the circuit breaker's execution of a long delay action, thereby improving the operating stability and safety of the entire electrical system.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, a transformer is provided, comprising a cover, wherein a plurality of insulation cavities and a plurality of transformer core assemblies are provided in the cover, each transformer core assembly is respectively arranged corresponding to the insulation cavity, and a heat insulation member is respectively provided in each insulation cavity, and the heat insulation member is configured to block the heat generated by the transformer core assembly during operation from being conducted to the outside through the insulation cavity.

[0007] As an optional technical solution for the above-mentioned mutual inductor, a plurality of partitions are provided at intervals along the length direction of the cover at the inner bottom of the cover, and the heat insulation cavity is formed between two adjacent partitions or between the partition and the side wall of the cover.

[0008] As an optional technical solution for the above-mentioned mutual inductor, a first electronic component board is provided on the outside of the cover, and a plurality of mounting grooves are respectively provided on each of the partitions, and the mounting grooves extend along the width direction of the cover. A plurality of first plug-in connectors are respectively provided in each of the mounting grooves, and the two ends of the first plug-in connector are respectively passed through the mounting grooves, one end of the first plug-in connector is plugged into the first electronic component board, and the other end of the first plug-in connector is used to be plugged into the second electronic component board of the circuit breaker.

[0009] As an optional technical solution for the above-mentioned transformer, a plurality of plug-in slots are provided on the cover shell, each of the plug-in slots is provided with a second connector, one end of the second connector is connected to the corresponding transformer core assembly, and the other end of the second connector passes through the plug-in slot and is connected to the first electronic component board.

[0010] As an optional technical solution for the above-mentioned mutual inductor, a receiving groove is provided on one side outside the cover, a positioning column and a first mounting hole are provided at the bottom of the receiving groove, a positioning hole and a second mounting hole are provided on the first electronic component board, the positioning column is inserted into the positioning hole, and the first mounting hole and the second mounting hole are arranged correspondingly.

[0011] As an optional technical solution for the above-mentioned mutual inductor, a support column is provided in each of the insulation cavities, and the support column extends along the height direction of the cover shell to the opening of the cover shell. A plurality of support plates are provided between the circumference of the support column and the cavity wall of the insulation cavity. The mutual inductor core assembly is sleeved on the support column and rests on the support plate, and the insulation component is provided between two adjacent support plates.

[0012] As an optional technical solution of the above-mentioned mutual inductor, the housing is filled with insulating grease, and the insulating grease in the thermal insulation cavity forms the thermal insulation member.

[0013] In a second aspect, a circuit breaker is provided, comprising a base and a transformer as described above, wherein the base is provided with an installation cavity and a wiring cavity, one side of the installation cavity is connected to the wiring cavity, and the other side of the installation cavity is connected to the interior of the base, the transformer is arranged in the installation cavity, and the thermal insulation member is arranged toward the interior of the base, and the transformer core assembly is arranged toward the wiring cavity.

[0014] As an optional technical solution for the above-mentioned circuit breaker, a second electronic component board is provided on the outside of the base, a connector is provided on the second electronic component board, a through hole is provided at the bottom of the mounting cavity, the through hole is arranged corresponding to the other end of the first connector, and the connector passes through the through hole and is plugged into the other end of the first connector.

[0015] As an optional technical solution for the above-mentioned circuit breaker, the outer cover of the second electronic component board is provided with a bottom plate, the bottom plate is connected to the base, and a limit member is provided on the side of the bottom plate facing the second electronic component board. The limit member is pressed against the second electronic component board, and the limit member is arranged close to the connector.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a transformer and a circuit breaker, wherein a heat insulating cavity is provided in a cover of the transformer, a heat insulating member is provided in the heat insulating cavity, and each transformer core assembly is respectively provided with a corresponding heat insulating cavity, the heat insulating member of the transformer is arranged toward the inner side of the base of the circuit breaker, and the transformer core assembly is arranged toward the wiring cavity of the base, the wiring cavity is communicated with the external environment, the heat generated by the transformer core assembly during operation can be blocked by the heat insulating member, and the heat is dissipated to the outside of the circuit breaker through the wiring cavity, thereby reducing the heat entering the interior of the circuit breaker, improving the heat dissipation speed of the transformer, reducing the temperature inside the circuit breaker, avoiding the heat generated during operation of the transformer affecting the execution of the long delay action of the circuit breaker, and improving the operating stability and safety of the entire electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a first isometric view of a base with a mutual inductor installed provided by an embodiment of the present utility model;

[0019] Figure 2 This is a second isometric view of a base with a mutual inductor installed provided by an embodiment of the present utility model;

[0020] Figure 3 This is an exploded diagram of a mutual inductor provided by an embodiment of the present utility model;

[0021] Figure 4 This is a first isometric view of a mutual inductor provided by an embodiment of the present utility model;

[0022] Figure 5 This is a first isometric view of the cover provided by an embodiment of the present utility model;

[0023] Figure 6 This is a structural diagram of a first electronic component board provided by an embodiment of the present utility model;

[0024] Figure 7 This is an exploded view of the second electronic component board, the bottom plate, and the base provided by an embodiment of the present utility model;

[0025] Figure 8 This is a schematic structural diagram of a second electronic component board provided by an embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the bottom structure of the base provided by an embodiment of the present utility model;

[0027] Figure 10 It is a second isometric view of the cover provided by an embodiment of the present utility model;

[0028] Figure 11 This is a structural diagram of a base provided by an embodiment of the present utility model and provided with a bottom plate installed;

[0029] Figure 12 It is a structural schematic diagram of the base plate provided by an embodiment of the utility model.

[0030] In the picture:

[0031] 1. Housing; 2. Insulation cavity; 3. Transformer core assembly; 4. Insulation element; 5. First electronic component board; 6. First connector; 7. Second connector; 8. Insulation grease;

[0032] 11. Partition; 12. Mounting slot; 13. Insertion slot; 14. Accommodation slot; 141. Positioning post; 142. First mounting hole; 143. Groove; 15. Positioning slot; 16. Guide slope; 17. Partition plate;

[0033] 21. Support column; 211. Through hole; 22. Support plate;

[0034] 31. First transformer core; 32. Second transformer core;

[0035] 51. Positioning hole; 52. Second mounting hole; 53. First temperature measurement connector; 54. First power connector;

[0036] 100. Base; 101. Installation cavity; 102. Wiring cavity; 103. Through hole; 104. Partition; 105. Step groove; 1051. First step groove; 1052. Second step groove; 200. Second electronic component board; 202. Connector; 2021. Second power connector; 2022. Second temperature measurement connector; 300. Bottom plate; 301. Limiting piece; 400. Transformer. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] like Figure 1 and Figure 2 As shown, this embodiment provides a circuit breaker, which includes a base 100 and a transformer 400. The base 100 is provided with an installation cavity 101 and a wiring cavity 102. One side of the installation cavity 101 is connected to the wiring cavity 102, and the other side of the installation cavity 101 is connected to the interior of the base 100. The transformer 400 is arranged in the installation cavity 101.

[0042] like Figures 1 to 3As shown, a transformer 400 includes a housing 1, within which are disposed multiple insulation chambers 2 and multiple transformer core assemblies 3. Each transformer core assembly 3 is disposed corresponding to a corresponding insulation chamber 2. Each insulation chamber 2 is provided with a thermal insulator 4. The thermal insulator 4 is configured to prevent heat generated during operation of the transformer core assembly 3 from being transferred to the outside through the insulation chamber 2. When the transformer 400 is installed within the mounting chamber 101, the thermal insulator 4 faces the interior of the base 100, while the transformer core assembly 3 faces the wiring chamber 102. The wiring chamber 102 is connected to the external environment. Heat generated during operation by the transformer core assembly 3 is blocked by the thermal insulator 4 and dissipated to the outside of the circuit breaker through the wiring chamber 102. This reduces the amount of heat entering the circuit breaker, improves the heat dissipation rate of the transformer 400, and lowers the temperature inside the circuit breaker. This prevents heat generated during operation of the transformer 400 from affecting the circuit breaker's long-delay operation, thereby improving the operational stability and safety of the entire electrical system.

[0043] A circuit breaker typically includes phases A, B, and C, each with a corresponding wiring cavity 102 to connect three-phase power. Each phase also has a corresponding transformer core assembly 3, so the corresponding housing 1 contains three transformer core assemblies 3 and three insulation cavities 2. Multiple barriers 104 are located within the base 100 on the other side of the mounting cavity 101. These barriers 104 correspond to adjacent transformer core assemblies 3, preventing short circuits between the two phases and increasing the creepage distance between them.

[0044] like Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, in some embodiments, the inner bottom of the housing 1 is provided with multiple partitions 11 spaced apart along the length of the housing 1. A thermal insulation cavity 2 is formed between adjacent partitions 11 or between a partition 11 and the sidewall of the housing 1. This structure is simple and easy to manufacture. When the transformer 400 is placed within the base 100, the bottom of the housing 1 faces the inside of the base 100, and the opening of the housing 1 faces the wiring cavity 102. Optionally, the partitions 11 are integrally formed with the housing 1.

[0045] A first electronic component board 5 is provided on the outside of the housing 1 and is fixed on the housing 1 .

[0046] Alternatively, as Figure 5 and Figure 6As shown, a receiving groove 14 is provided on one side outside the housing 1. A positioning post 141 and a first mounting hole 142 are provided at the bottom of the receiving groove 14. A positioning hole 51 and a second mounting hole 52 are provided on the first electronic component board 5. The positioning post 141 is inserted into the positioning hole 51 to position the first electronic component board 5 so that the first mounting hole 142 and the second mounting hole 52 are correspondingly arranged. Then, a connector is used to penetrate the second mounting hole 52 and connect it to the first mounting hole 142, thereby achieving a fixed connection of the first electronic component board 5. Typically, the first electronic component board 5 is a rectangular plate-shaped structure. The positioning holes 51 are provided at two diagonally opposite corners of the first electronic component board 5, and the second mounting holes 52 are provided at the other two corners. When the connector connects the first electronic component board 5 and the housing 1, the first electronic component board 5 is subjected to uniform force and has good connection stability.

[0047] Each of the partitions 11 is provided with a plurality of mounting slots 12, which extend along the width direction of the housing 1. Each mounting slot 12 is provided with a plurality of first connectors 6, which are spaced apart. The mounting slots 12 are respectively provided at both ends of the first connector 6. One end of the first connector 6 is connected to the first electronic component board 5, and the other end of the first connector 6 is used to connect to the second electronic component board of the circuit breaker. The first connector 6 is provided to connect the first electronic component board 5 on the mutual inductor 400 and the second electronic component board in the circuit breaker, replacing the wiring harness connection. This solves the problems in the prior art, such as the difficulty in perforating the wiring harness, the time-consuming wiring, the easy pressure on the wiring harness causing breakage or short-circuit burning, and the disadvantages of mass production. The mounting slots 12 also serve to isolate the first connector 6 and prevent short circuits. The first connector 6 is a pin, which realizes a hard connection between the first electronic component board 5 and the second component board, making it less prone to damage.

[0048] Optionally, three insulation cavities 2 are provided in the housing 1, that is, at least two partitions 11 need to be provided in the housing 1. The mutual inductor 400 needs to have two functions of temperature measurement and power supply, and needs to be provided with two groups of first connectors 6 accordingly, one group of first connectors 6 is used for power supply, and the other group of first connectors 6 is used for transmitting temperature measurement signals. A first temperature measurement connector 53 and a first power supply connector 54 are provided on the first electronic component board 5. The first temperature measurement connector 53 is plugged into a group of first connectors 6, and the number of the first connectors 6 in this group matches the number of the plug-in interfaces of the first temperature measurement connector 53. The first power supply connector 54 is plugged into another group of first connectors 6, and the number of the first connectors 6 in this group matches the number of the plug-in interfaces of the first power supply connector 54.

[0049] A groove 143 is recessed at the bottom of the accommodating groove 14, and a groove 143 is correspondingly provided for each group of first connectors 6. The first connector 6 passes through the mounting groove 12 and is placed in the groove 143. The first temperature measuring connector 53 or the first power connector 54 is plugged into the groove 143 and is plugged into the first connector 6 at the same time. The setting of the groove 143 serves to fix the first temperature measuring connector 53 or the first power connector 54, thereby improving the stability of the connection between the first temperature measuring connector 53 or the first power connector 54 and the first connector 6.

[0050] Alternatively, as Figure 7 、 Figure 8 and Figure 10 As shown, the second electronic component board 200 of the circuit breaker is arranged on the outside of the base 100, and a connector 202 is provided on the second electronic component board 200. Optionally, corresponding to the first electronic component board 5, the connector 202 on the second electronic component board 200 includes a second power connector 2021 and a second temperature measurement connector 2022. The bottom of the installation cavity 101 is provided with a through hole 103, and the through hole 103 is corresponding to the other end of the first plug-in connector 6. The connector 202 passes through the through hole 103 and is plugged into the other end of the first plug-in connector 6, thereby realizing the electrical connection between the second electronic component board 200 and the first electronic component board 5. During the connection process, the mutual inductor 400 is placed in the installation cavity 101 of the base 100. It is only necessary to directly plug in the second electronic component board 200 without arranging the wiring harness, which improves the convenience of assembly and is suitable for mass production.

[0051] like Figure 9 and Figure 10 As shown, partitions 17 are provided on opposite sides of the other end of each set of first connectors 6. These partitions 17 provide insulation, increasing the creepage distance between the two sets of first connectors 6 and preventing short circuits. When the transformer 400 is installed in the mounting cavity 101 of the base 100, the partitions 17 are positioned within the through-holes 103. The partitions 17 and the walls of the through-holes 103 form a slot for the connector 202 to plug into, improving the stability of the connection between the connector 202 and the first connectors 6.

[0052] like Figure 7 、 Figure 11 and Figure 12As shown, the outer cover of the second electronic component board 200 is provided with a bottom plate 300, which is connected to the base 100 and serves to fix and protect the second electronic component board 200. A stopper 301 is provided on the side of the bottom plate 300 facing the second electronic component board 200. The stopper 301 presses against the second electronic component board 200 and is located near the connector 202. The stopper 301 presses against the second electronic component board 200 to prevent the side of the second electronic component board 200 connected to the first connector 6 from tilting, which would cause poor contact between the connector 202 and the first connector 6. Optionally, the stopper 301 is a protrusion integrally formed with the bottom plate 300, which has a simple structure and is easy to process.

[0053] See also Figure 9 As shown, a stepped groove 105 is provided on the outside of the base 100, and the stepped groove 105 includes a first stepped groove 1051 and a second stepped groove 1052. The area of ​​the second stepped groove 1052 is larger than that of the first stepped groove 1051. The first stepped groove 1051 is used to accommodate the second electronic component board 200, and the second stepped groove 1052 is used to accommodate the bottom plate 300, so that the bottom plate 300 is flush with the surface of the base 100, does not affect the installation of other components, and can place the second electronic component board 200 in a closed space to protect the second electronic component board 200 from damage.

[0054] See also Figure 3 、 Figure 4 and Figure 10 As shown, the transformer core assembly 3 is electrically connected to the first electronic component board 5. In some embodiments, the housing 1 is provided with a plurality of insertion slots 13, each of which houses a second connector 7. One end of the second connector 7 is connected to the corresponding transformer core assembly 3, and the other end of the second connector 7 passes through the insertion slot 13 and plugs into the first electronic component board 5. This replaces the wiring harness connection in the prior art and solves the problems of the prior art, such as the difficulty of wiring harness perforation, the time-consuming wiring, the easy pressure on the harness causing breakage or short-circuit burning, and the disadvantage of mass production. The insertion slots 13 also serve to isolate the second connector 7, preventing short circuits. The second connector 7 is a pin, which achieves a hard connection between the first electronic component board 5 and the transformer core assembly 3 and is not easily damaged.

[0055] Optionally, a plug-in slot 13 is provided on the side wall of the housing 1 near the first electronic component board 5. Each plug-in slot 13 is provided with a second plug-in connector 7. Every two plug-in slots 13 form a group. One end of the second plug-in connector 7 is placed in the plug-in slot 13 for electrical connection with the transformer core assembly 3. The other end of the second plug-in connector 7 is bent 90°. A positioning slot 15 is provided on the end surface of the housing 1. The other end of the second plug-in connector 7 is placed in the positioning slot 15, and the end passes through the positioning slot 15 to be electrically connected to the first electronic component board 5. Optionally, the second plug-in connector 7 is connected to the transformer core assembly 3 via a wire, which can be placed in the plug-in slot 13.

[0056] The transformer core assembly 3 includes a first transformer core 31 and a second transformer core 32 , the specific structure of which is known in the art and will not be described in detail here.

[0057] The transformer core assembly 3 is disposed within the housing 1. To position the transformer core assembly 3, a support column 21 is provided within each insulating cavity 2. The support column 21 extends along the height of the housing 1 to the opening of the housing 1. Multiple support plates 22 are spaced circumferentially between the support columns 21 and the walls of the insulating cavity 2. The transformer core assembly 3 is sleeved on the support columns 21 and rests on the support plates 22. A thermal insulator 4 is provided between adjacent support plates 22. The support plates 22 support the transformer core assembly 3, while the support columns 21 limit the position of the transformer core assembly 3.

[0058] The support column 21 is provided with a through hole 211 along its axial direction, and the through hole 211 passes through the bottom of the insulation cavity 2. When the mutual inductor 400 is installed in the base 100, the conductive parts of the circuit breaker can pass through the through hole 211 to connect with other components in the base 100.

[0059] Optionally, the partition 11 , the support column 21 and the support plate 22 are an integrally formed structure with the housing 1 .

[0060] See also Figure 3 and Figure 4As shown, when assembling the transformer 400, the first connector 6 is placed in the mounting groove 12, the second connector 7 is connected to the transformer core assembly 3, and then the second connector 7 is placed in the insertion groove 13, with the other end of the second connector 7 placed in the positioning groove 15. The transformer core assembly 3 is sleeved on the support column 21 and abuts against the support plate 22. Insulating grease 8 is filled into the housing 1. After the insulating grease 8 solidifies, the transformer core assembly 3 is fixed to the housing 1. The insulating grease 8 in the insulation cavity 2 solidifies to form the insulation member 4. The insulating grease 8 in the mounting groove 12 solidifies to fix the first connector 6. The insulating grease 8 in the insertion groove 13 solidifies to fix the second connector 7. The positioning groove 15 is also filled with insulating grease 8. The through hole 211 of the support column 21 is not filled with insulating grease 8. The first electronic component board 5 is then fixed in the receiving groove 14, and the first connector 6 is plugged into the first electronic component board 5.

[0061] Combine Figure 2 and Figure 4 As shown, after the transformer 400 is assembled, it is installed in the base 100 of the circuit breaker. The size of the installation cavity 101 on the base 100 matches the size of the cover 1 of the transformer 400 to prevent the transformer 400 from shaking in the base 100. The transformer 400 is inserted into the installation cavity 101 along the width direction of the cover 1. To facilitate the installation of the transformer 400, the two opposite side walls of the cover 1 are provided with guide slopes 16.

[0062] See also Figure 2 and Figure 7 As shown, the mutual inductor 400 is placed in the installation cavity 101 of the base 100, and the second electronic component board 200 is installed. The connector 202 of the second electronic component board 200 is plugged into the other end of the first connector 6, and then a bottom plate 300 is covered on the outside of the second electronic component board 200. The bottom plate 300 is connected to the base 100 to fix the second electronic component board 200.

[0063] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A mutual inductor, characterized in that: The invention comprises a housing (1), wherein a plurality of heat-insulating cavities (2) and a plurality of transformer core assemblies (3) are provided in the housing (1), each transformer core assembly (3) is respectively provided corresponding to one of the heat-insulating cavities (2), and a heat-insulating element (4) is respectively provided in each of the heat-insulating cavities (2), and the heat-insulating element (4) is configured to block the heat generated by the transformer core assembly (3) during operation from being conducted to the outside through the heat-insulating cavity (2).

2. The mutual inductor according to claim 1, characterized in that: The inner bottom of the housing (1) is provided with a plurality of partitions (11) spaced apart along the length direction of the housing (1), and the heat-insulating cavity (2) is formed between two adjacent partitions (11) or between the partitions (11) and the side wall of the housing (1).

3. The mutual inductor according to claim 2, characterized in that: A first electronic component board (5) is provided on the outside of the housing (1), and a plurality of mounting grooves (12) are provided on each of the partitions (11), the mounting grooves (12) extending along the width direction of the housing (1), and a plurality of first plug-in connectors (6) are provided in each of the mounting grooves (12), and the two ends of the first plug-in connector (6) are respectively penetrated by the mounting grooves (12), one end of the first plug-in connector (6) is plugged into the first electronic component board (5), and the other end of the first plug-in connector (6) is used to be plugged into the second electronic component board (200) of the circuit breaker.

4. The mutual inductor according to claim 3, characterized in that: The cover (1) is provided with a plurality of plug-in slots (13), each of which is provided with a second plug-in connector (7), one end of the second plug-in connector (7) is connected to the corresponding transformer core assembly (3), and the other end of the second plug-in connector (7) passes through the plug-in slot (13) and is plugged into the first electronic assembly board (5).

5. The mutual inductor according to claim 3, characterized in that: A receiving groove (14) is provided on one side outside the cover shell (1), a positioning column (141) and a first mounting hole (142) are provided at the bottom of the receiving groove (14), a positioning hole (51) and a second mounting hole (52) are provided on the first electronic component board (5), the positioning column (141) is inserted into the positioning hole (51), and the first mounting hole (142) and the second mounting hole (52) are provided correspondingly.

6. The mutual inductor according to claim 1, characterized in that: A support column (21) is provided in each of the heat-insulating cavities (2), and the support column (21) extends along the height direction of the cover shell (1) to the opening of the cover shell (1). A plurality of support plates (22) are provided between the circumference of the support column (21) and the cavity wall of the heat-insulating cavity (2). The mutual inductor core assembly (3) is sleeved on the support column (21) and rests on the support plate (22), and the heat-insulating member (4) is provided between two adjacent support plates (22).

7. The mutual inductor according to any one of claims 1 to 6, characterized in that: The housing (1) is filled with insulating grease (8), and the insulating grease (8) in the heat-insulating cavity (2) forms the heat-insulating component (4).

8. A circuit breaker, characterized in that The invention comprises a base (100) and a mutual inductor (400) according to any one of claims 1 to 7, wherein the base (100) is provided with an installation cavity (101) and a wiring cavity (102), one side of the installation cavity (101) is communicated with the wiring cavity (102), and the other side of the installation cavity (101) is communicated with the interior of the base (100), the mutual inductor (400) is arranged in the installation cavity (101), and the thermal insulation component (4) is arranged toward the interior of the base (100), and the mutual inductor core assembly (3) is arranged toward the wiring cavity (102).

9. The circuit breaker according to claim 8, characterized in that A second electronic component board (200) is provided on the outer side of the base (100), a connector (202) is provided on the second electronic component board (200), a through hole (103) is provided at the bottom of the installation cavity (101), the through hole (103) is arranged corresponding to the other end of the first plug-in connector (6), and the connector (202) passes through the through hole (103) and is plugged into the other end of the first plug-in connector (6).

10. The circuit breaker according to claim 9, characterized in that The outer cover of the second electronic component board (200) is provided with a bottom plate (300), the bottom plate (300) is connected to the base (100), and a limiting member (301) is provided on the side of the bottom plate (300) facing the second electronic component board (200), the limiting member (301) is pressed against the second electronic component board (200), and the limiting member (301) is arranged close to the connector (202).

Images