Three-in-one current sensor

Abstract

The utility model relates to a three-in-one current sensor, and belongs to the technical field of three-phase current sensors. The transformer comprises a bottom shell, an upper cover, an iron core and a PCB (Printed Circuit Board), wherein the bottom shell is internally provided with three mutually independent inner cavities which are sequentially arranged from left to right; the upper cover is fixedly connected to the opening of the bottom shell so as to seal the top ends of the three inner cavities; the three iron cores are respectively positioned in the three inner cavities; the number of the PCBs is three, the PCBs are located in the three inner cavities respectively, the PCBs are connected with chips and wiring terminals, and connecting wires in the wiring terminals are arranged to the outer side of the bottom shell in a penetrating mode. The three inner cavities are each provided with a supporting body in a matched and inserted mode, each supporting body is provided with an iron core fixing groove and a PCB fixing groove, the iron core fixing grooves are used for allowing the iron cores to be inserted in a matched mode, and the PCB fixing grooves are used for allowing the PCBs to be inserted in a matched mode. The three-in-one current sensor provided by the utility model is shorter in assembly time and higher in production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of three-phase current sensors, in particular to a three-in-one current sensor. Background Art

[0002] A three-in-one current sensor, also known as a three-phase current sensor or a multi-channel current sensor, is a device capable of simultaneously measuring the currents of each phase in a three-phase circuit. The three-in-one current sensing generally includes structures such as a housing, a magnetic core, windings, sensing elements, and terminal blocks. Components such as the magnetic core and terminal blocks need to be fixed to the housing to avoid shaking.

[0003] In the prior art, whether it is a three-in-one sensor or other sensors, generally, the magnetic core is fixed by pouring epoxy resin into the housing. However, the epoxy resin poured into the housing needs to be added with a curing agent and stirred and mixed before it can be cured. Usually, special stirring equipment is required to stir the epoxy resin in the housing. In this way, during the production process of the current sensor, the time for waiting for the epoxy resin to cure is relatively long, which will lead to a reduction in the production efficiency of the current sensor and a longer production cycle. Summary of the Utility Model

[0004] The utility model provides a three-in-one current sensor to solve the technical problem of low production efficiency of the current sensor caused by fixing the iron core by pouring epoxy resin in the prior art.

[0005] To solve the above problems, a three-in-one current sensor provided by the utility model adopts the following technical solutions:

[0006] A three-in-one current sensor, comprising:

[0007] A bottom shell, in which three inner cavities are arranged in sequence from left to right and are independent of each other;

[0008] An upper cover, connected to the opening of the bottom shell to close the top ends of the three inner cavities;

[0009] Three iron cores, respectively located in the three inner cavities;

[0010] Three PCB boards, respectively located in the three inner cavities. Chips and terminal blocks are connected to the PCB boards, and the wires in the terminal blocks penetrate to the outside of the bottom shell;

[0011] One support body is respectively and adaptively inserted into each of the three inner cavities. The support body is provided with an iron core fixing groove and a PCB board fixing groove. The iron core fixing groove is used for the iron core to be adaptively inserted, and the PCB board fixing groove is used for the PCB board to be adaptively inserted;

[0012] The upper cover is pressed downward on the iron core and the PCB board, so that the iron core and the PCB board are clamped between the upper cover and the bottom case.

[0013] With the above technical solution, a support body is used to limit the positions of the PCB board and the iron core in the cavity, and the upper cover is pressed on the iron core and the PCB board, thereby fixing the iron core and the PCB board in the inner cavity. The support body can be manufactured simultaneously with the production of the bottom case and the upper cover. After manufacturing, the support body is inserted into the inner cavity of the bottom case, and then the PCB board and the iron core are respectively inserted into the PCB board groove and the iron core groove on the support body. After that, the upper cover is connected to the top of the bottom case to complete the fixation of the iron core and the PCB board. Compared with the method of fixing the iron core and the PCB board by pouring epoxy resin into the case, there is no need to wait for the epoxy resin to cure, and the production efficiency is higher.

[0014] Further, a limiting block is provided on the bottom cavity wall of the inner cavity, and a corresponding limiting groove is provided on the bottom side wall of the support body. When the support body is inserted into the inner cavity, the limiting block is adaptively inserted into the limiting groove.

[0015] With the above technical solution, the support body in the inner cavity is positioned in the horizontal direction to prevent the support body from shaking in the inner cavity.

[0016] Further, the inner cavity includes a PCB board cavity and an iron core cavity arranged in sequence from front to back, and the support body includes a PCB board support portion and an iron core support portion arranged in sequence from front to back. The PCB board fixing groove is provided on the PCB board support portion, and the iron core fixing groove is provided on the iron core support portion. The iron core support portion is correspondingly inserted into the iron core cavity, and the PCB board support portion is correspondingly inserted into the PCB board cavity.

[0017] Further, two baffles spaced in the front-rear direction are provided on each of the left and right cavity walls of the PCB board cavity. The two baffles on each cavity wall are evenly arranged on the front and rear sides of the PCB board fixing groove, and the top surface of the baffle is higher than the top surface of the support body.

[0018] With the above technical solution, during the insertion of the PCB board, a guiding channel is formed between the two baffles, which is convenient for the PCB board to be inserted into the PCB board fixing groove.

[0019] Further, the iron core fixing groove is C-shaped, and the C-shaped opening of the iron core fixing groove faces forward, and the PCB board fixing groove is located directly in front of the C-shaped opening of the corresponding iron core fixing groove.

[0020] Further, three wiring grooves are provided at the top of the front side wall in the bottom case, and the three wiring grooves are respectively located directly in front of the C-shaped openings of the three iron core fixing grooves. The wiring grooves are used for the wiring in the wiring terminals to pass through.

[0021] Further, the top surface of the PCB board inserted into the PCB board fixing groove is higher than the top surface of the support body, and the top surface of the iron core inserted into the iron core fixing groove is higher than the top surface of the support body.

[0022] With the above technical solution, when the positive and negative positions of the PCB board or the iron core are installed incorrectly, it is convenient to take out the PCB board or the iron core from the support body and reinstall it.

[0023] Further, the upper cover is connected to the bottom shell by laser welding.

[0024] With the above technical solution, the upper cover can be more firmly connected to the bottom shell.

[0025] The beneficial effect of a three-in-one current sensor provided by the present utility model is that: the iron core and the PCB board are limited at the set positions in the bottom shell through the support body, and the iron core and the PCB board are clamped between the upper cover and the bottom shell by pressing the iron core and the PCB board through the upper cover, realizing the fixation of the iron core and the PCB board. Compared with the method of fixing the iron core by pouring epoxy resin, the present utility model does not need to wait for the curing of the epoxy resin during assembly, takes less time to assemble, and has higher production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the drawings and reading the detailed description below, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 is a structural schematic diagram of a three-in-one current sensor provided by the present utility model Figure 1 ;

[0028] Figure 2 is a structural schematic diagram of a three-in-one current sensor provided by the present utility model Figure 2 ;

[0029] Figure 3 is a structural schematic diagram of the bottom shell in a three-in-one current sensor provided by the present utility model;

[0030] Figure 4 is a structural schematic diagram of the upper cover in a three-in-one current sensor provided by the present utility model;

[0031] Figure 5 is a structural schematic diagram of the support body in a three-in-one current sensor provided by the present utility model Figure 1 ;

[0032] Figure 6Structural schematic of a support body in a three-in-one current sensor provided by the present utility model Figure 2 。

[0033] Explanation of reference numerals:

[0034] 1. Upper cover; 101. PCB board slot; 102. Iron core slot; 103. Iron core pressing block; 2. Bottom shell; 201. Iron core cavity; 202. PCB board cavity; 3. Wiring terminal; 4. Iron core; 5. PCB board; 6. Chip; 7. Support body; 701. Iron core support part; 702. PCB board support part; 703. Iron core fixing groove; 704. PCB board fixing groove; 705. First limiting groove; 706. Second limiting groove; 8. Column; 9. Baffle; 10. Second limiting block; 11. First limiting block; 12. Notch. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0036] The following is one of the embodiments of a three-in-one current sensor provided by the present utility model:

[0037] As Figure 1 、 Figure 2 shown, a three-in-one current sensor includes a bottom shell 2, a support body 7, an iron core 4, a PCB board 5, and an upper cover 1.

[0038] The bottom shell 2 is provided with three inner cavities arranged in sequence from left to right and independent of each other. The inner cavities include a PCB board cavity 202 and an iron core cavity 201 arranged in sequence from front to back. The PCB board cavity 202 and the iron core cavity 201 are in communication with each other.

[0039] As Figure 3 shown, the iron core cavity 201 is in an O shape, and the PCB board cavity 202 is located directly in front of the iron core cavity 201. A plurality of columns 8 are arranged at intervals in the circumferential direction on the inner cavity wall of the iron core cavity 201. The columns 8 are used to strengthen the support for the iron core 4. The top surface of the column 8 is inclined downward from top to bottom towards the inside of the iron core cavity 201 to facilitate the insertion of the iron core 4. A protruding first limiting block 11 is provided on the bottom cavity wall of the iron core cavity 201. There are a plurality of first limiting blocks 11, which are arranged at intervals in the circumferential direction of the iron core cavity 201.

[0040] The PCB board cavity 202 is square. On the left and right cavity walls of the PCB board cavity 202, there is a set of baffle groups respectively. The two sets of baffle groups are arranged symmetrically left and right. Each set of baffle groups includes two baffles 95 arranged at intervals in the front-rear direction. On the left and right cavity walls of the PCB board 5, there is a column 8 respectively. The column 8 is located between the two baffles 95 in the baffle 95 group. On the bottom cavity wall of the PCB board cavity 202, there are two sets of limit protrusion groups arranged at intervals in the left-right direction. Each set of limit protrusion groups includes two second limit blocks 10 arranged at intervals in the front-rear direction.

[0041] As Figure 3 shown, at the top of the front side wall of the bottom shell 2, there are three wiring grooves. The three sets of wiring grooves are respectively located directly in front of the three PCB board cavities 202. Each set of wiring grooves includes a plurality of notches 12 arranged at intervals in the left-right direction.

[0042] As Figure 2 shown, there are three support bodies 7. The three support bodies 7 are respectively inserted and fitted into the three inner cavities. As Figure 5 、 Figure 6 shown, the support body 7 includes a PCB board support part 702 and an iron core support part 701 connected in sequence from front to back. The iron core support part 701 is in an O shape. The PCB board support part 702 is inserted and fitted into the PCB board cavity 202, and the iron core support part 701 is inserted and fitted into the iron core cavity 201.

[0043] On the PCB board support part 702, there is a PCB board fixing groove. On the iron core support part 701, there is an iron core fixing groove 703 in a C shape. The opening of the iron core fixing groove 703 faces forward. The PCB board fixing groove 704 is correspondingly located directly in front of the C-shaped opening of the iron core fixing groove 703.

[0044] At the bottom of the PCB board support part 702, there are two sets of limit groove groups arranged at intervals in the left-right direction. Each set of limit groove groups includes two second limit grooves 706 respectively arranged on the front and rear sides of the PCB board fixing groove 704. Each second limit groove 706 is respectively used for inserting each of the above-mentioned second limit blocks 10. At the bottom of the iron core support part 701, there are a plurality of first limit grooves 705 arranged at circumferential intervals. The plurality of first limit grooves 705 are respectively used for inserting each of the above-mentioned first limit blocks 11.

[0045] The iron core 4 is in a C shape and there are three pieces. The three pieces of iron core 4 are respectively inserted and fitted into the three iron core fixing grooves 703. The top surface of the iron core 4 is higher than the top surface of the support body 7.

[0046] There are three PCB boards 5, which are respectively inserted into three PCB board fixing grooves 704. The front side of the PCB board 5 is connected with a chip 6 and a terminal block 3. Each wire in the terminal block 3 is respectively inserted into each notch 12 in the wiring groove, and the wires all extend to the outside of the bottom case 2.

[0047] As Figure 4 shown, the bottom of the upper cover 1 is provided with a PCB board card slot 101 and an iron core card slot 102 respectively for covering the PCB board 5 and the iron core 4. An iron core pressing block 103 is arranged in the iron core card slot 102. The upper cover 1 is fixedly connected to the top of the bottom case 2 by laser welding. When the upper cover 1 is fixedly connected to the bottom case 2, the bottom surface of the groove of the PCB board card slot 101 presses tightly on the PCB board 5, and the iron core pressing block 103 presses tightly on the iron core 4. The iron core 4 and the PCB board 5 are clamped between the bottom case 2 and the upper cover 1 to realize the fixation of the iron core 4 and the PCB board 5.

[0048] When assembling the utility model, first place the support block correspondingly in the inner cavity, so that the PCB board support part 702 is correspondingly inserted into the PCB board cavity 202, and the iron core support part 701 is correspondingly inserted into the iron core cavity 201. Then insert the iron core 4 into the iron core fixing groove 703, insert the PCB board 5 into the PCB board fixing groove 704, and insert each wire in the terminal block 3 into each notch 12 in the groove group to complete the assembly of the internal structure of the bottom case 2. Then place the upper cover 1 on the top of the bottom case 2 to close the top of the bottom case 2. The upper cover 1 presses tightly on the top surfaces of the iron core 4 and the PCB board 5. Then place the assembled upper cover 1 and the bottom case 2 on the laser welding equipment, and fixedly connect the upper cover 1 to the bottom case 2 by laser welding. At this time, the upper cover 1 presses down tightly on the PCB board 5 and the iron core 4, so that the PCB board 5 and the iron core 4 are fixed between the bottom case 2 and the upper cover 1.

[0049] The utility model positions the iron core 4 and the PCB board 5 in the inner cavity by setting the support body 7, and presses down the iron core 4 and the PCB board 5 by the upper cover 1 to fix the iron core 4 and the PCB board 5 between the upper cover 1 and the bottom case 2. Compared with the prior art method of fixing the iron core 4 and the PCB board 5 by pouring epoxy resin, the utility model takes less time in the assembly process and has higher production efficiency.

[0050] In this embodiment, a limiting block is arranged on the bottom cavity wall of the cavity, and a limiting groove is arranged at the bottom of the support body 7. The limiting block is correspondingly inserted into the limiting groove to make the positioning of the support body 7 in the cavity more accurate. In other embodiments, when the matching accuracy between the outer side wall of the support body 7 and the cavity wall of the inner cavity is relatively high, the limiting protrusion and the limiting groove can be not set. At this time, the positioning of the support body 7 is directly realized through the plug-in fit between the inner cavity and the support body 7.

[0051] Based on the above description of this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationships such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the description of the solution of the present utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationships cannot be understood or interpreted as limitations on the solution of the present utility model.

[0052] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

Claims

1. A three-in-one current sensor, comprising: A bottom shell, wherein three inner cavities are arranged in sequence from left to right and are independent of each other; An upper cover, fixedly connected to the opening of the bottom shell to close the top ends of the three inner cavities; There are three iron cores, which are respectively located in three inner cavities; There are three PCB boards, which are respectively located in the three inner cavities. The PCB boards are connected with chips and wiring terminals, and the wiring in the wiring terminals is passed to the outside of the bottom shell; It is characterized in that a support body is adapted and inserted in each of the three inner cavities, and an iron core fixing groove and a PCB board fixing groove are provided on the support body, the iron core fixing groove is used for the iron core to be adapted and inserted, and the PCB board fixing groove is used for the PCB board to be adapted and inserted; The upper cover is pressed downwardly onto the iron core and the PCB board, so that the iron core and the PCB board are clamped between the upper cover and the bottom shell.

2. A three-in-one current sensor according to claim 1, characterized in that: A limiting block is provided on the bottom cavity wall of the inner cavity, and a corresponding limiting groove is provided on the bottom side wall of the support body. When the support body is inserted into the inner cavity, the limiting block is adapted to be inserted into the limiting groove.

3. The three-in-one current sensor according to claim 1, characterized in that: The inner cavity includes a PCB board cavity and an iron core cavity arranged in sequence from front to back, the support body includes a PCB board support portion and an iron core support portion arranged in sequence from front to back, the PCB board fixing groove is provided on the PCB board support portion, the iron core fixing groove is provided on the iron core support portion, the iron core support portion is correspondingly inserted in the iron core cavity, and the PCB board support portion is correspondingly inserted in the PCB board cavity.

4. A three-in-one current sensor according to claim 3, characterized in that: The left cavity wall and the right cavity wall of the PCB board cavity are each provided with two baffles spaced apart in the front-to-back direction, and the two baffles on each cavity wall are respectively arranged at the front and rear sides of the PCB board fixing groove.

5. The three-in-one current sensor according to claim 3, characterized in that: The iron core fixing groove is C-shaped, the C-shaped opening of the iron core fixing groove is arranged forward, and the PCB board fixing groove is located directly in front of the corresponding C-shaped opening of the iron core fixing groove.

6. The three-in-one current sensor according to claim 5, characterized in that: The top of the front side wall of the bottom shell is provided with three wiring grooves, which are respectively located in front of the C-shaped openings of the three core fixing grooves, and are used for the wiring in the wiring terminal to pass through.

7. A three-in-one current sensor according to any one of claims 1-6, characterized in that: The top surface of the PCB board inserted in the PCB board fixing groove is higher than the top surface of the support body, and the top surface of the iron core inserted in the iron core fixing groove is higher than the top surface of the support body.

8. A three-in-one current sensor according to any one of claims 1-6, characterized in that: The upper cover is connected to the bottom shell by laser welding.

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