Multifunctional current transformer

Abstract

The utility model relates to the technical field of current detection, in particular to a multifunctional current transformer which comprises a shell, a mounting cavity is arranged in the shell, and a printed circuit board suitable for providing a circuit is arranged in the mounting cavity; the charging current detection assembly is suitable for detecting the charging current in the circuit; the leakage current detection assembly is suitable for detecting the magnitude of leakage current in a circuit; the supporting piece is suitable for supporting the leakage current detection assembly; and an isolation assembly adapted to provide an electrical gap. According to the utility model, leakage current detection and charging current detection are combined into one, the use is convenient, and the size is small. According to the utility model, the leakage current detection assembly and the charging current detection assembly are assembled in the same cavity, the glue filling process is reduced, the assembly is convenient, and the cost is lower. According to the utility model, the supporting member in the middle plays a role in isolating and supporting the leakage current detection assembly, and also plays a role in accurately positioning the second current detection probe, thereby ensuring the assembly precision of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of current detection, and specifically relates to a multifunctional current transformer. Background Art

[0002] The residual current detection module RCD (Residual Current Device) is a device used to detect the magnitude of the leakage current in a circuit. If an RCD is not installed in the circuit, when a person or an animal comes into contact with a high voltage, a leakage current will be generated to the ground. When the leakage current exceeds a certain threshold, it will cause the fibrillation of the heart of the person or the animal, resulting in cardiac arrest and further causing life danger; if a leakage detection device such as an RCD is installed in the circuit, when there is a leakage current in the circuit and the magnitude of the leakage current signal exceeds the set threshold, the RCD will send an alarm signal to the actuating mechanism to trigger the actuating mechanism to quickly disconnect the circuit, thereby achieving the purpose of protecting life safety.

[0003] The charging current detection module is a device for detecting alternating current. It can detect the information of the measured charging current and convert the detected information into an electrical signal or other forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control. The charging current detection module is an important link to achieve automatic detection and automatic control.

[0004] Problems existing in the above technologies: Currently, the residual current detection module and the charging current detection module are usually independent of each other. If they are connected, a live wire needs to be configured to pass through the charging current detection module, and a neutral wire and a live wire need to be configured to pass through the residual current detection module. The overall configuration is complex and occupies a large area. Content of the Utility Model

[0005] The purpose of the utility model is to provide a multifunctional current transformer to solve the problems existing in the prior art.

[0006] To solve the above technical problems, the utility model provides the following technical solution: A multifunctional current transformer includes a housing, and there is an installation cavity inside the housing. The installation cavity is provided with:

[0007] A printed circuit board, suitable for providing a circuit;

[0008] A charging current detection component, suitable for detecting the magnitude of the charging current in a circuit;

[0009] A leakage current detection component, suitable for detecting the magnitude of the leakage current in a circuit;

[0010] A support member, suitable for supporting the leakage current detection component;

[0011] and an isolation component, suitable for providing an electrical clearance.

[0012] Further, the charging current detection component includes a first current detection probe and a first current detection magnetic core: Bent portions are provided at both needle arms of the first current detection probe, a first probe slot and a first magnetic core seat are provided at the bottom of the installation cavity of the housing, and the first current detection probe is installed on the first probe slot; The first current detection magnetic core is installed on the first magnetic core seat, an induction coil is wound around the first current detection magnetic core, the induction coil is electrically connected to a corresponding port of the printed circuit board, and one of the needle arms of the first current detection probe passes through the inner circle of the induction coil.

[0013] Further, the leakage current detection component includes a second current detection probe and a second current detection magnetic core: The second current detection probe is installed on the support member; The second current detection magnetic core is installed on the support member, an induction coil is wound around the second current detection magnetic core, the induction coil is electrically connected to a corresponding port of the printed circuit board, and one of the needle arm ends of the second current detection probe passes through the inner circle of the second current detection magnetic core.

[0014] Further, a second probe slot and a second magnetic core seat are provided on the upper surface of the support member, the second magnetic core seat is located beside the second probe slot, and a notch for the second current detection magnetic core to pass through is provided on the second probe slot.

[0015] Further, positioning posts are provided on the lower surface of the support member; Positioning holes are formed at the bottom of the installation cavity of the housing, and the positioning posts are inserted into the positioning holes.

[0016] Further, positioning blocks extend from the side surface of the support member; Positioning grooves are formed in the side wall of the installation cavity of the housing, and the positioning blocks are clamped in the positioning grooves.

[0017] Further, the isolation component includes:

[0018] A first isolation plate, suitable for providing an electrical clearance for the charging current detection component and the leakage current detection component;

[0019] And a second isolation plate, suitable for providing an electrical clearance for the printed circuit board and the leakage current detection component.

[0020] Further, the first isolation plate is provided with a fixing groove for buckling on the housing and a first partition magnetic core groove for the second current detection magnetic core to pass through; A pair of first clamping plates are provided on the inner side wall of the housing for clamping the first isolation plate.

[0021] Further, bumps for being mounted on the side walls of the outer shell are provided on both sides of the second partition board, and a second partition board core slot for the second current detection core to pass through is provided in the middle of the second partition board; a pair of grooves are provided on the side walls of the outer shell for mounting the bumps of the second partition board.

[0022] Further, the printed circuit board is horizontally or vertically mounted in the installation cavity of the outer shell.

[0023] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0024] The present utility model combines the leakage current detection and the charging current detection into one, which is convenient to use and has a small volume.

[0025] The leakage current detection component and the charging current detection component of the present utility model are assembled in the same cavity, reducing the potting process, being convenient for assembly and having a lower cost.

[0026] The middle support member of the present utility model not only plays a role in isolating and supporting the leakage current detection component, but also can accurately position the second current detection probe, ensuring the assembly accuracy of the product.

[0027] The printed circuit board of the present utility model can be horizontally installed or vertically installed. When horizontally installed, the space on the side of the mutual inductor can be reduced, with higher flexibility; when vertically installed, the high-voltage resistance level of the product can be enhanced, and at the same time, more components can be arranged and more functions can be expanded.

[0028] The present utility model can successively install the charging current detection component, the support member, the leakage current detection component and the isolation component from the same installation port. The components are assembled in a single direction, the assembly is simple, and the cost of the mass production automatic assembly equipment is lower. Description of the Drawings

[0029] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0030] Figure 1 is the overall structural schematic diagram of Embodiment 1;

[0031] Figure 2 is the exploded view of Embodiment 1;

[0032] Figure 3 is the top view of the outer shell of Embodiment 1;

[0033] Figure 4 is the top view of the support member of Embodiment 1.

[0034] In the figure, 1 is the outer shell; 11 is the installation cavity; 12 is the first probe slot; 13 is the first magnetic core seat; 14 is the positioning hole; 15 is the positioning groove; 16 is the first clamping plate; 17 is the groove; 2 is the printed circuit board; 3 is the charging current detection component; 31 is the first current detection probe; 32 is the first current detection magnetic core; 4 is the leakage current detection component; 41 is the second current detection probe; 42 is the second current detection magnetic core; 5 is the support; 51 is the second probe slot; 52 is the second magnetic core seat; 53 is the positioning post; 54 is the positioning block; 6 is the isolation component; 61 is the first isolation plate; 611 is the fixed groove; 612 is the first partition magnetic core groove; 62 is the second isolation plate; 621 is the convex block; 622 is the second partition magnetic core groove. Detailed implementation mode

[0035] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1

[0037] As Figure 1 shown, Embodiment 1 of the present invention discloses a multifunctional current transformer, which includes an insulating outer shell 1. A printed circuit board 2 is installed in the outer shell 1, and a charging current detection component 3 and a leakage current detection component 4 are also installed. The multifunctional current transformer in Embodiment 1 of the present invention combines the functions of leakage current detection and charging current detection, which is convenient to use and reduces the overall volume.

[0038] It can be understood that, based on actual applications, an installation cavity 11 is provided in the outer shell 1 of Embodiment 1. A slot is provided on the side of the installation cavity 11 for vertically inserting the printed circuit board 2. When installed vertically, the area of the printed circuit board 2 where electronic components can be installed is larger, more components can be arranged, more functions can be expanded, and the high-voltage resistance level of the product can be enhanced. Of course, it should not be limited here. The slot may not be provided on the side of the installation cavity 11, and the printed circuit board 2 can be installed in other ways. For example, the printed circuit board 2 can be horizontally installed in the installation cavity 11 of the outer shell 1.

[0039] To adapt to the installation of the charging current detection component 3, as Figure 3 shown, the installation cavity 11 is integrally barrel-shaped, and a first probe slot 12 and a first magnetic core seat 13 are injection-molded on the bottom surface of the installation cavity 11. The first probe slot 12 is composed of two columns with an arc-shaped cross-section, and there is a certain distance between the two arc-shaped columns. The first magnetic core seat 13 is composed of 2 to 4 short columns distributed in a circle.

[0040] Based on the above, the charging current detection component 3 includes a first current detection probe 31 and a first current detection magnetic core 32.

[0041] It can be understood that, based on practical applications, such as Figure 2 As shown, bends are provided at both end arms of the first current detection probe 31. The body part of the first current detection probe 31 is inserted between two arc-shaped columns of the first probe slot 12, and both end arms extend upward out of the housing 1. The first current detection magnetic core 32 is a current induction coil with a through-round hole in the middle. An induction coil is wound around the first current detection magnetic core 32, and the induction coil is electrically connected to the corresponding port of the printed circuit board 2. The inner ring of the first current detection magnetic core 32 allows one of the end arms of the first current detection probe to pass through. The 2 to 4 short columns of the first magnetic core seat 13 at the bottom of the installation cavity 11 of the housing 1 jointly support the first current detection magnetic core 32. In order to prevent the first current detection magnetic core 32 from slipping out of the first magnetic core seat 13 easily, the top surfaces of 1 to 2 short columns are inclined planes that slope towards the magnetic core to limit the first current detection magnetic core 32.

[0042] Based on the above, the first embodiment 1 further includes a second functional module, a leakage current detection component 4, and the leakage current detection component 4 includes a second current detection probe 41 and a second current detection magnetic core 42.

[0043] It can be understood that, based on practical applications, such as Figure 2 As shown, a current induction coil is wound around the second current detection magnetic core 42, the induction coil of the second current detection magnetic core 42 is electrically connected to the corresponding port of the printed circuit board 2, and the inner ring of the second current detection magnetic core 42 allows one of the end arms of the second current detection probe 41 to pass through.

[0044] Based on the above, in order to facilitate the installation of the leakage current detection component 4, the first embodiment 1 further provides an intermediate support member 5. The support member 5 is used to support and position the leakage current detection component 4, and physically isolate the charging current component and the leakage current detection component 4, providing an electrical clearance between the two in the vertical direction.

[0045] It can be understood that, based on practical applications, such as Figure 4As shown, the support member 5 is integrally circular ring-shaped, and the size of the circular ring is adapted to the barrel shape of the installation cavity 11. The support member 5 is integrally injection-molded from an insulating material. The upper surface of the support member 5 is provided with a second probe slot 51 and a second magnetic core seat 52. The second magnetic core seat 52 is located beside the second probe slot 51. The second probe slot 51 is composed of two columns with an arc-shaped cross-section, and there is a notch for the second current detection magnetic core 42 to pass through between the columns. The second magnetic core seat 52 is composed of 2 to 3 short columns. The second probe slot 51 is used to install the second current detection probe 41. The 2 to 3 short columns of the second magnetic core seat 52 are used to support the second current detection magnetic core 42. Similarly, the top surfaces of 1 to 2 of the short columns are inclined planes that are inclined towards the magnetic core to limit the second current detection magnetic core 42.

[0046] In order to install the support member 5 inside the housing 1, as Figure 2 and Figure 4 shown, the lower surface of the support member 5 is provided with positioning posts 53, and positioning holes 14 are formed at the bottom of the installation cavity 11 of the housing 1. The positioning posts 53 are inserted into the positioning holes 14 to achieve the X-direction and Y-direction fixation of the support member 5; at the same time, positioning blocks 54 extend from the side surface of the support member 5, and positioning grooves 15 are formed on the side wall of the installation cavity 11 of the housing 1. The positioning blocks 54 are clamped in the positioning grooves 15 to achieve the Z-direction fixation of the support member 5 and prevent it from rotating.

[0047] Based on the above, Embodiment 1 further includes an isolation component 6. As Figure 1 shown, the isolation component 6 includes a first isolation plate 61 for providing an electrical clearance for the charging current detection component and the leakage current detection component 4, and a second isolation plate 62 for providing an electrical clearance for the isolation printed circuit board and the leakage current detection component 4. Both the first isolation plate 61 and the second isolation plate 62 are made of insulating materials.

[0048] It can be understood that based on actual applications, as Figure 2 shown, the first isolation plate 61 is provided with a fixing groove 611 for buckling on the housing 1 and a first partition magnetic core groove 612 for the second current detection magnetic core 42 to pass through. A pair of first clamping plates 16 are provided on the inner side wall of the housing 1 for clamping the first isolation plate 61. Protrusions 621 for being erected on the side wall of the housing 1 are provided on both sides of the second isolation plate 62, and a second partition magnetic core groove 622 for the second current detection magnetic core 42 to pass through is provided in the middle of the second isolation plate 62. A pair of grooves 17 are provided on the side wall of the housing 1 for installing the protrusions 621 of the second isolation plate 62.

[0049] The installation process of Embodiment 1 is as follows:

[0050] The first step: Install the printed circuit board 2 and vertically insert it into the slot on the side of the housing 1;

[0051] Step 2: Install the charging current detection component 3. Place the first current detection probe 31 into the first probe slot 12, thereby ensuring the fixed position of the first current detection probe 31 in the installation cavity 11 and ensuring the dimensional accuracy between the first current detection probe 31 and the housing 1. Place the first current detection magnetic core 32 into the installation cavity 11, and insert one needle arm of the first current detection probe 31 into the inner ring of the first current detection magnetic core 32;

[0052] Step 3: Place the support member 5 into the installation cavity 11, insert its positioning post 53 into the positioning hole 14, and engage the positioning block 54 in the positioning groove 15;

[0053] Step 4: Install the leakage current detection component 4. Place the second current detection probe 41 into the second probe slot, thereby ensuring the fixed position of the second current detection probe 41 on the support member 5 in the installation cavity 11 and ensuring the dimensional accuracy between the second current detection probe 41 and the housing 1. Place the second current detection magnetic core 42 on the support member 5 in the installation cavity 11, and insert one needle arm of the second current detection probe 41 into the inner ring of the second current detection magnetic core 42;

[0054] Step 5: Install the isolation component 6. Install the first isolation plate 61 between the first current detection probe 31 and the second current detection probe 41, and install the second isolation plate 62 between the second current probe and the printed circuit board 2;

[0055] Step 6: Smooth out and extend the needle arms of the first current detection probe 31 and the second current detection probe 41 out of the housing 1;

[0056] Step 7: Pot and seal with epoxy resin to fix and insulate each part, making the components in the installation cavity 11 an integral whole, and together with the housing, form a current transformer that combines charging current detection and leakage current detection.

[0057] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A multifunctional current transformer, comprising a housing (1), wherein an installation cavity (11) is arranged inside the housing (1), and is characterized in that, The installation cavity (11) is provided with: A printed circuit board (2), suitable for providing circuits; A charging current detection component (3), suitable for detecting the magnitude of the charging current in the circuit; A leakage current detection component (4), suitable for detecting the magnitude of the leakage current in the circuit; A support member (5), suitable for supporting the leakage current detection component (4); And an isolation component (6), suitable for providing an electrical clearance.

2. The multifunctional current transformer according to claim 1, wherein The charging current detection component (3) includes a first current detection probe (31) and a first current detection magnetic core (32): both ends of the needle arms of the first current detection probe (31) are bent. At the bottom of the installation cavity (11) of the housing (1), there are a first probe slot (12) and a first magnetic core seat (13). The first current detection probe (31) is installed on the first probe slot (12); the first current detection magnetic core (32) is installed on the first magnetic core seat (13). An induction coil is wound around the first current detection magnetic core (32), and the induction coil is electrically connected to the corresponding port of the printed circuit board (2). The inner circle of the first current detection magnetic core (32) allows one of the needle arms of the first current detection probe (31) to pass through.

3. The multifunctional current transformer according to claim 2, wherein The leakage current detection component (4) includes a second current detection probe (41) and a second current detection magnetic core (42): the second current detection probe (41) is installed on the support member (5); the second current detection magnetic core (42) is installed on the support member (5). An induction coil is wound around the second current detection magnetic core (42), and the induction coil is electrically connected to the corresponding port of the printed circuit board (2). The inner circle of the second current detection magnetic core (42) allows one of the needle arm ends of the second current detection probe (41) to pass through.

4. The multifunctional current transformer according to claim 3, characterized in that, On the upper surface of the support member (5), there are a second probe slot (51) and a second magnetic core seat (52). The second magnetic core seat (52) is located beside the second probe slot (51). The second probe slot (51) is provided with a notch for the second current detection magnetic core (42) to pass through.

5. The multifunctional current transformer according to claim 4, characterized in that, On the lower surface of the support member (5), there are positioning posts (53); at the bottom of the installation cavity (11) of the housing (1), there are formed positioning holes (14), and the positioning posts (53) are inserted into the positioning holes (14).

6. The multifunctional current transformer according to claim 5, wherein, On the side of the support member (5), there extends a positioning block (54); on the side wall of the installation cavity (11) of the housing (1), there is a positioning groove (15), and the positioning block (54) is clamped in the positioning groove (15).

7. The multifunctional current transformer according to claim 1, wherein The isolation component (6) includes: A first isolation plate (61), suitable for providing an electrical clearance for the charging current detection component (3) and the leakage current detection component (4); And a second isolation plate (62), suitable for providing an electrical clearance for the printed circuit board (2) and the leakage current detection component (4).

8. The multifunctional current transformer according to claim 7, wherein, On the first isolation plate (61), there are a fixing groove (611) for buckling on the housing (1) and a first partition magnetic core groove (612) for the second current detection magnetic core (42) to pass through; on the inner side wall of the housing (1), there are a pair of first clamping plates (16) for clamping the first isolation plate (61).

9. The multifunctional current transformer according to claim 7, characterized in that, On both sides of the second partition board (62), there are bumps (621) for being mounted on the side wall of the housing (1). In the middle of the second partition board (62), there is a second partition board magnetic core groove (622) for the second current detection magnetic core (42) to pass through. On the side wall of the housing (1), there are a pair of grooves (17) for mounting the bumps (621) of the second partition board (62).

10. The multifunctional current transformer according to claim 1, characterized in that, The printed circuit board (2) is horizontally or vertically mounted in the installation cavity (11) of the housing (1).

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