Combined mutual inductor and circuit breaker

Abstract

The utility model provides a combined type mutual inductor and circuit breaker, the combined type mutual inductor comprises a flame-retardant housing, a plurality of current coils arranged in the flame-retardant housing, a PCB sampling board arranged at one side of the flame-retardant housing, and a first glue pouring layer, the flame-retardant housing comprises an outer housing and an inner housing, a plurality of accommodating cavities are formed in the inner shell, the plurality of current coils are accommodated in the accommodating cavities, the current coils are sealed in the accommodating cavities by the first glue pouring layers, and the current coils are electrically connected with the PCB sampling board through connecting pins. According to the combined type mutual inductor and the circuit breaker, the first glue pouring layer enables the current coil and the flame-retardant shell to form a whole, when the circuit breaker is assembled, only the combined type mutual inductor needs to be assembled with other structures, cost is saved, efficiency is improved, the connection mode is simple, and labor cost is saved.

Description

Technical Field

[0001] The utility model relates to a combined mutual inductor and a circuit breaker. Background Art

[0002] With the gradual popularization of digitization and intelligentization, China's independent small intelligent switches have been gradually introduced to the market. However, at present, the processing technology and labor costs of such products have not been controlled. Because in most of the existing intelligent switches, this part is installed with independent mutual inductors, which are large in volume, occupy space, and the connection method is welding wires or taking power through plugs. This requires manual installation and the installation is complex.

[0003] In view of this, it is necessary to improve the existing combined mutual inductor to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a combined mutual inductor to solve the problems of difficult assembly and high labor cost of the existing circuit breaker.

[0005] To achieve the above purpose, the utility model provides a combined mutual inductor, which includes a flame-retardant housing, a plurality of current coils arranged in the flame-retardant housing, a PCB sampling board arranged on one side of the flame-retardant housing, and a first potting layer. The flame-retardant housing includes an outer housing and an inner housing. A plurality of receiving cavities are formed inside the inner housing, and the plurality of current coils are received in the receiving cavities. The first potting layer seals the current coils in the receiving cavities, and the current coils are electrically connected to the PCB sampling board through connecting pins.

[0006] As a further improvement of the utility model, the inner housing includes a limiting wall, a support shaft arranged in the limiting wall, and a sealing bottom cover connecting the limiting wall and one end of the support shaft. The receiving cavity is formed by enclosing the limiting wall, the support shaft, and the sealing bottom cover, and the current coil is wound around the support shaft.

[0007] As a further improvement of the utility model, a wire-winding notch is provided on the limiting wall for leading out the current coil to be connected to the connecting pin.

[0008] As a further improvement of the utility model, the PCB sampling board is axially arranged on one side of the flame-retardant housing close to the limiting wall.

[0009] As a further improvement of the utility model, the plurality of current coils include an A-phase through coil, a B-phase through coil, and a C-phase through coil arranged in sequence and side by side. The middle parts of the A-phase through coil, the B-phase through coil, and the C-phase through coil are hollow to form an A-phase wire-through hole, a B-phase wire-through hole, and a C-phase wire-through hole respectively.

[0010] As a further improvement of the present utility model, the inner housing further forms an N-phase wire passing hole adjacent to the C-phase wire passing coil. The N-phase wire passing hole is located on the side of the C-phase wire passing coil away from the B-phase wire passing coil. The combined transformer further includes an N-phase wire passing coil disposed in the N-phase wire passing hole.

[0011] As a further improvement of the present utility model, the combined transformer further includes a zero-sequence coil disposed between the outer housing and the inner housing. The zero-sequence coil is electrically connected to the PCB sampling board through a connection terminal.

[0012] As a further improvement of the present utility model, the combined transformer further includes a second potting layer for enclosing the zero-sequence coil between the outer housing and the inner housing.

[0013] As a further improvement of the present utility model, the flame-retardant housing further includes a sealing housing connecting one end of the outer housing and the inner housing. The sealing housing is disposed at one end away from the second potting layer. The connection pin penetrates through the sealing housing to be electrically connected to the PCB sampling board.

[0014] The present utility model also provides a circuit breaker, which includes the combined transformer as described above and a main PCB board. The PCB sampling board is electrically connected to the main PCB board.

[0015] The beneficial effects of the present utility model are as follows: For the combined transformer and the circuit breaker of the present utility model, the first potting layer and the second potting layer make the current coil and the zero-sequence coil form an integral body with the flame-retardant housing. When assembling the circuit breaker, it is only necessary to assemble the combined transformer with other structures, which saves costs and improves efficiency. The connection method is simple and the labor cost is saved. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the circuit breaker of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the combined transformer of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the flame-retardant housing of the combined transformer of the present utility model. Detailed Embodiments

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] As Figures 1 to 3 shown, the circuit breaker 100 includes a main housing 1, a combined mutual inductor 2 disposed in the main housing 1, and a main PCB board.

[0023] The combined mutual inductor 2 includes a flame-retardant housing 21, a plurality of current coils 22 disposed in the flame-retardant housing 21, a PCB sampling board 23 disposed on one side of the flame-retardant housing 21, a zero-sequence coil 24, a first potting layer 27, a second potting layer 25, and an N-phase through coil 26.

[0024] The flame-retardant housing 21 includes a housing body 211, an inner housing body 212, and a sealing housing body 213 connecting one end of the housing body 211 and the inner housing body 212.

[0025] The outer housing 211 is disposed outside the inner housing 212 and is spaced apart from the inner housing 212. The sealed housing 213 is located at one end close to the PCB sampling board 23, so that the outer housing 211, the inner housing 212, and the sealed housing 213 enclose a receiving cavity 2111 with an opening facing away from the side of the PCB sampling board 23. The zero-sequence coil 24 is disposed in the receiving cavity 2111 for measuring the zero-sequence current of the circuit breaker 100, that is, the zero-sequence coil 24 is disposed between the outer housing 211 and the inner housing 212.

[0026] The sealed housing 213 is disposed at one end away from the second potting layer 25. The second potting layer 25 is used to enclose the zero-sequence coil 24 between the outer housing 211 and the inner housing 212, specifically enclosed in the receiving cavity 2111.

[0027] A first terminal hole 2131 and a second terminal hole 2132 are formed through the sealed housing 213.

[0028] The zero-sequence coil 24 is electrically connected to the PCB sampling board 23 through a connection terminal 241. The second terminal hole 2132 is used for the connection terminal 241 to pass through.

[0029] A plurality of receiving cavities 2124 and N-phase wire passing holes 2125 disposed adjacent to the receiving cavities 2124 are formed inside the inner housing 212. Further, in this embodiment, the inner housing 212 includes a limiting wall 2121, a support shaft 2122 disposed inside the limiting wall 2121, and a sealed bottom cover 2123 connecting one end of the limiting wall 2121 and the support shaft 2122. The receiving cavity 2124 is enclosed by the limiting wall 2121, the support shaft 2122, and the sealed bottom cover 2123, and the current coil 22 is wound around the support shaft 2122.

[0030] The connection pin penetrates through the sealed housing 213 to be electrically connected to the PCB sampling board 23.

[0031] A wire winding notch 2126 is provided on the limiting wall 2121 for leading out the current coil 22 to be connected to the connection pin. The first terminal hole 2131 is used for the connection pin to pass through.

[0032] The PCB sampling board 23 is axially disposed on one side of the flame-retardant housing 21 close to the limiting wall 2121.

[0033] A plurality of the current coils 22 are received in the receiving cavity 2124. The first potting layer 27 seals the current coils 22 in the receiving cavity 2124. The current coils 22 are electrically connected to the PCB sampling board 23 through connection pins.

[0034] The multiple current coils 22 include a phase-A through coil 221, a phase-B through coil 222, and a phase-C through coil 223 that are arranged in sequence and side by side. A phase-A through hole, a phase-B through hole, and a phase-C through hole are respectively formed in the middle of the phase-A through coil 221, the phase-B through coil 222, and the phase-C through coil 223. The phase-A through coil 221, the phase-B through coil 222, and the phase-C through coil 223 are respectively used to measure the currents of the three phases A, B, and C of the circuit breaker 100.

[0035] The phase-N through hole 2125 is located on the side of the phase-C through coil 223 away from the phase-B through coil 222. Specifically, the phase-N through hole 2125 is adjacent to the phase-C through coil 223. The phase-N through coil 26 is arranged in the phase-N through hole 2125 and is used to detect the phase-N current.

[0036] The PCB sampling board 23 is electrically connected to the main PCB board. Specifically, a connection port 231 is formed on the PCB sampling board 23, and through the connection port 231, it is connected to the main PCB board, so as to transmit the information of the currents of the three phases A, B, and C and the phase-N current detected to the main PCB board for specific analysis.

[0037] For the combined current transformer 2 and the circuit breaker 100 of the present invention, the first potting layer 27 and the second potting layer 25 make the current coil 22 and the zero-sequence coil 24 form an integral body with the flame-retardant housing 21. When the circuit breaker 100 is assembled, it is only necessary to assemble the combined current transformer 2 with other structures, which saves costs and improves efficiency. The connection method is simple and the labor cost is saved.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0039] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A combined mutual inductor, characterized in that: The combined mutual inductor includes a flame-retardant shell, a plurality of current coils arranged in the flame-retardant shell, a PCB sampling board arranged on one side of the flame-retardant shell, and a first glue potting layer. The flame-retardant shell includes an outer shell and an inner shell. A plurality of receiving cavities are formed inside the inner shell. The plurality of current coils are received in the receiving cavities. The first glue potting layer seals the current coil in the receiving cavity. The current coil is electrically connected to the PCB sampling board through a connecting pin.

2. The combined mutual inductor according to claim 1, characterized in that: The inner shell includes a limiting wall, a support shaft arranged in the limiting wall, and a sealed bottom cover connecting the limiting wall and one end of the support shaft. The accommodating cavity is formed by the limiting wall, the support shaft and the sealed bottom cover, and the current coil is wound on the support shaft.

3. The combined mutual inductor according to claim 2, characterized in that: The limiting wall is provided with a winding notch for leading out the current coil and connecting with the connecting pin.

4. The combined mutual inductor according to claim 2, characterized in that: The PCB sampling plate is axially arranged on one side of the flame-retardant housing close to the limiting wall.

5. The combined mutual inductor according to claim 1, characterized in that: The multiple current coils include an A-phase through coil, a B-phase through coil and a C-phase through coil arranged sequentially and side by side, and the middle parts of the A-phase through coil, the B-phase through coil and the C-phase through coil are hollow to form an A-phase through hole, a B-phase through hole and a C-phase through hole respectively.

6. The combined mutual inductor according to claim 5, characterized in that: The inner shell is also formed with an N-phase threading hole adjacent to the C-phase threading coil, the N-phase threading hole is located on a side of the C-phase threading coil away from the B-phase threading coil, and the combined mutual inductor also includes an N-phase threading coil arranged in the N-phase threading hole.

7. The combined mutual inductor according to claim 1, characterized in that: The combined mutual inductor further comprises a zero-sequence coil arranged between the outer shell and the inner shell, and the zero-sequence coil is electrically connected to the PCB sampling board via a connecting terminal.

8. The combined mutual inductor according to claim 7, characterized in that: The combined mutual inductor further comprises a second glue potting layer, and the second glue potting layer is used to seal the zero-sequence coil between the outer shell and the inner shell.

9. The combined mutual inductor according to claim 8, characterized in that: The flame-retardant shell also includes a sealing shell connecting the outer shell and one end of the inner shell. The sealing shell is arranged at an end away from the second glue potting layer. The connecting pin passes through the sealing shell to be electrically connected to the PCB sampling board.

10. A circuit breaker, characterized in that: The circuit breaker comprises the combined mutual inductor according to any one of claims 1 to 9 and a main PCB board, and the PCB sampling board is electrically connected to the main PCB board.

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