Electric leakage sensor and charging pile

Abstract

The utility model relates to the technical field of electric leakage sensors, in particular to an electric leakage sensor and a charging pile. The leakage current detector comprises a shell assembly, a printed circuit board, a leakage induction magnetic core and a plurality of leakage current detection copper columns, and the shell assembly is only composed of a rear cover, a base, a shell and a fixed cover. The fixing cover is provided with a buckle fixing piece used for being connected with the shell and a plurality of guiding structures used for guiding installation of the leakage current detection copper columns. A through groove is formed in the center of the shell, a buckle guide groove is formed in the top of the through groove, and the buckle fixing piece on the fixing cover penetrates through the buckle guide groove in the shell to be fixed to the shell. A convex ring is arranged on the fixed cover and is used for being inserted into the through groove of the shell; a guide structure is arranged on the convex ring, the guide structure is a convex mounting column, and an arc-shaped groove for the leakage current detection copper column to pass through is formed in the mounting column. According to the utility model, the copper pins and the shell are fixed through the fixing cover, the position precision is ensured, and the copper pins are prevented from shaking to influence the test accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage sensors, in particular to a leakage sensor and a charging pile. Background Technique

[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 touches 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, leading to cardiac arrest and thus life-threatening. 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. With the global trend of automotive electrification, existing small leakage circuit breaker switches have begun to be used explosively in charging piles.

[0003] Currently, the detection of leakage current mostly uses a wire-through form, which allows the measured current to flow through the copper pins in various ways, so as to detect the leakage current in the measured circuit. However, the copper pin structure of the existing leakage current sensor is prone to shaking during installation or use, resulting in a lack of stability and thus affecting the detection effect. Content of the Utility Model

[0004] The purpose of the utility model is to provide a leakage sensor and a charging pile to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A leakage sensor includes a housing assembly, a printed circuit board, a leakage induction magnetic core, and a plurality of leakage current detection copper posts. The housing assembly is only composed of a rear cover, a base, a housing, and a fixing cover. The printed circuit board, the leakage induction magnetic core, and a plurality of leakage current detection copper posts are installed on the housing. The fixing cover is provided with a snap-fastening member for connecting with the housing and a plurality of guiding structures for installing the leakage current detection copper posts.

[0006] Further, there is a through groove on the housing, and a snap-fastening limit groove for limiting the position of the snap-fastening member is provided at the top of the through groove. The snap-fastening member on the fixing cover passes through the snap-fastening limit groove on the housing to be fixed to the housing.

[0007] Further, two secondary snap-fastening members are provided protruding on the fixing cover, and the two secondary snap-fastening members are respectively located on both sides of the snap-fastening member.

[0008] Further, a circular convex ring is provided on the fixed cover for inserting into the through groove of the housing; the buckle fixing part is integrally formed on the convex ring, and a guiding structure is provided on the convex ring. The guiding structure is a protruding mounting post, and an arc-shaped groove for the leakage current detection copper post to pass through is provided in the mounting post.

[0009] Further, a commutation limiting groove for commuting the copper feet of the leakage current detection copper post is also provided at the bottom of the mounting post.

[0010] Further, the upper part of the through groove is circular and the bottom is flat. Several baffle plates are provided on the inner wall of the upper through groove, and the baffle plates are arranged parallel to the bottom surface of the housing; when the fixed cover is assembled on the housing, the baffle plates are located below the guiding structure, and the baffle plates and the guiding structure together form a limiting space for the leakage current detection copper post.

[0011] Further, several card slots for fixing the copper feet of the leakage current detection copper post are provided at the bottom of the surface of the housing close to the fixed cover, and the card slots are arranged side by side on the same horizontal line.

[0012] Further, a second avoidance groove corresponding to the card slot is provided on the fixed cover.

[0013] Further, several support columns for keeping the upper and lower sections of the leakage current detection copper post in the same vertical plane are provided at the upper part of the surface of the housing close to the fixed cover.

[0014] Based on the above technical problems, the present utility model also provides another technical solution: a charging pile, including a host module, a charging module, a power switching module and a protection module, and the above-mentioned leakage sensor is installed in the protection module.

[0015] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: through the design of the fixed cover, the present utility model fixes the copper feet and the housing and ensures the position accuracy, avoiding the shaking of the copper feet and thus affecting the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 is the overall structural schematic diagram of Embodiment 1;

[0018] Figure 2 is the schematic diagram of another perspective of the overall structure of Embodiment 1;

[0019] Figure 3 is the schematic diagram of the split structure of each component of Embodiment 1;

[0020] Figure 4 Figure 1 is a schematic view showing another perspective of the fixed cover and the housing in Embodiment 1.

[0021] In the figure, 1 is a housing assembly; 2 is a printed circuit board; 3 is a leakage induction magnetic core; 4 are a plurality of leakage current detection copper posts; 5 is a rear cover; 6 is a base; 61 is a copper pin tube; 62 is a second buckle member; 7 is a housing; 71 is a through groove; 72 is a buckle limit groove; 73 is a baffle; 74 is a card slot; 75 is a support post; 8 is a fixed cover; 81 is a buckle fixing member; 82 is a secondary buckle member; 83 is a convex ring; 84 is a guiding structure; 85 is an arc-shaped groove; 86 is a commutation limit groove; 87 is a second avoidance groove; 88 is a third avoidance groove; 89 is a buckle strip. Detailed implementation manners

[0022] 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 of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1

[0024] As Figures 1 - 3 shown, Embodiment 1 of the present invention discloses a leakage sensor, including a housing assembly 1, a printed circuit board 2, a leakage induction magnetic core 3, and a plurality of leakage current detection copper posts 4. Among them, the housing assembly 1 is only composed of a rear cover 5, a base 6, a housing 7, and a fixed cover 8. The housing 7 is provided with a through groove 71, and the leakage induction magnetic core 3 is installed on the outer wall where the through groove 71 is located. The printed circuit board 2 is installed on the outer layer of the leakage induction magnetic core 3, and the two are electrically connected. A plurality of leakage current detection copper posts 4 pass through the inside of the through groove 71, and the copper pins of the leakage current detection copper posts 4 extend to both sides of the housing 7 and pass through the base 6. The rear cover 5 and the fixed cover 8 are respectively located on both sides of the housing 7 to fix and encapsulate all components.

[0025] Based on the above, in order to facilitate the installation of the fixed cover 8 and the housing 7, the fixed cover 8 is provided with a buckle fixing member 81 and a secondary buckle member 82 for connecting with the housing 7.

[0026] As Figure 3As shown in the figure, based on actual applications, a ring of convex rings 83 is provided on the fixed cover 8 for inserting into the through groove 71 of the outer shell 7, and the snap fixing member 81 is integrally formed on the convex ring 83. A snap limit groove 72 for defining the position of the snap fixing member 81 is provided at the top of the through groove 71 of the outer shell 7, and the snap fixing member 81 on the fixed cover 8 passes through the snap limit groove 72 on the outer shell 7 to fix the outer shell 7. At the same time, two secondary snap members 82 are provided at any other position of the convex ring 83, and the two secondary snap members 82 are respectively located on both sides of the snap fixing member 81, forming a triangular installation position, making the connection between the fixed cover 8 and the outer shell 7 more stable.

[0027] Based on the above, in order to fix the position of the leakage current detection copper column 4, a plurality of guiding structures 84 for installing the leakage current detection copper column 4 are provided on the fixed cover 8.

[0028] As Figure 3 shown in the figure, based on actual applications, guiding structures 84 integrally formed are provided on the convex ring 83 of the fixed cover 8. The guiding structures 84 are raised mounting posts, and arc-shaped grooves 85 for the leakage current detection copper column 4 to pass through are provided in the mounting posts. There can be 4 to 8 guiding structures 84, which are evenly distributed along the convex ring 83. The guiding structures 84 can ensure the position accuracy of the leakage current detection copper column 4 and prevent the leakage current detection copper column 4 from shaking, thus affecting the test accuracy. In order to facilitate the copper feet to change direction to the base 6, a reversing limit groove 86 for the copper feet to change direction is further provided at the bottom of the guiding structure 84.

[0029] Based on the above, in order to facilitate the pre-installation of the leakage current detection copper column 4, a baffle 73 is further provided on the inner wall of the through groove 71, and a card slot 74 is provided on the outer shell 7.

[0030] As Figure 4 shown in the figure, based on actual applications, the upper part of the through groove 71 is circular and the bottom is flat. A plurality of baffles 73 are provided on the inner wall of the upper through groove 71, and the baffles 73 are arranged parallel to the bottom surface of the outer shell 7. When the fixed cover 8 is assembled on the outer shell 7, the baffle 73 is located below the guiding structure 84. The baffle 73 and the guiding structure 84 together form a limiting space for the leakage current detection copper column, providing a preliminary positioning, facilitating subsequent installation and limiting functions during the installation process of the leakage current detection copper column 4. In addition, a plurality of card slots 74 for fixing the copper feet of the leakage current detection copper column 4 are provided at the bottom of the side of the outer shell 7 close to the fixed cover 8. The card slots 74 are arranged side by side, providing a preliminary positioning for the copper feet during the installation process of the leakage current detection copper column 4. At the same time, a second avoidance groove 87 corresponding to the card slot 74 is provided on the fixed cover 8 to reduce the influence of the card slot 74 on the appearance of the fixed cover 8 and the outer shell 7. And in order to ensure the consistency of the distance between the copper feet passing through the inner hole of the through groove 71 from the outer shell 7 and the distance between the copper feet in the lower card slot 74 from the outer shell 7, a plurality of support columns 75 are further provided on the outer shell 7. See Figure 1, the thickness of the support column 75 and the card slot 74 should be as similar as possible. Keeping the upper and lower sections of the leakage current detection copper column 4 consistent helps improve the accuracy of the test. In addition to providing preliminary positioning during pre-assembly, the above-mentioned baffle 73 and card slot 74 also further limit the copper pins after assembly.

[0031] Based on the above, in order to facilitate the assembly of the cylinder pins and the base 6, several copper pin cylinders 61 are provided on the base 6.

[0032] As Figure 3 shown, based on practical applications, two columns of copper pin cylinders 61 are respectively arranged on the upper surface of the base 6. On the one hand, the copper pin cylinders 61 isolate the copper pins, which is used to increase the creepage distance in the leakage sensor; on the other hand, they further limit the position of the copper pins to ensure the installation and cooperation with external docking parts.

[0033] Based on the above, in order to facilitate the assembly of the fixed cover 8 and the base 6, a second buckle 62 is provided on the base 6.

[0034] As Figure 4 shown, based on practical applications, a second buckle 62 is respectively provided at the central positions on both sides of the base 6. One is used for snap connection with the rear cover 5, and the other is used for snap connection with the fixed cover 8. In order to cooperate with the second buckle 62, a third avoidance groove 88 for the second buckle 62 to pass through is provided on the side of the fixed cover 8 away from the housing 7, and a buckle strip 89 is provided on the inner wall of the third avoidance groove 88.

[0035] In the above-mentioned Embodiment 1, the number of the leakage current detection copper columns 4 can be adjusted according to the number of phases of the measured current.

[0036] The installation process of Embodiment 1 is as follows:

[0037] The first step is to install the leakage induction magnetic core 3 and the printed circuit board 2 first;

[0038] The second step is to install the leakage current detection copper column 4. First, pass several leakage current detection copper columns 4 through the through groove 71 in the center of the housing 7. The baffle 73 and the straight bottom in the cylinder groove perform preliminary positioning on the leakage current detection copper column 4; the copper pins near the fixed cover 8 are preliminarily positioned through the support column 75 and the card slot 74;

[0039] The third step is to install the fixed cover 8. Align the convex ring 83 with the through groove 71, the buckle fixing part 81 with the buckle limit groove 72, and the leakage current detection copper column 4 with the guiding structure 84, and gradually insert the fixed cover 8 into the housing 7, so that the buckle fixing part 81 and the secondary buckle part 82 are fixed on the wall of the through groove 71 of the housing 7;

[0040] Step 4: Install the base 6. The copper pins near the rear cover 5 are simply arranged and then pass through the copper pin cylinder 61 of the base 6. The copper pins near the fixed cover 8 pass through the copper pin cylinder 61 of the base 6 after being limited by the support column 75 and the card slot 74. The second fasteners 62 on the base 6 are respectively clamped with the rear cover 5 and the fixed cover 8.

[0041] Embodiment 2

[0042] A charging pile includes a host module, a charging module, a power switching module and a protection module. The above-mentioned leakage sensor is installed in the protection module. The other structures of the charging pile are the prior art and will not be elaborated here.

[0043] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned 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-restrictive. 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 claims involved.

Claims

1. A leakage current sensor, comprising a housing assembly (1), a printed circuit board (2), a leakage induction magnetic core (3) and a plurality of leakage current detection copper posts (4), characterized in that, The housing assembly (1) is only composed of a rear cover (5), a base (6), a housing (7) and a fixing cover (8). A printed circuit board (2), a leakage induction magnetic core (3) and several leakage current detection copper posts (4) are installed on the housing (7). The fixing cover (8) is provided with a snap-fastening member (81) for connecting with the housing (7) and several guiding structures (84) for installing the leakage current detection copper posts (4).

2. The leakage sensor according to claim 1, characterized in that, There is a through groove (71) on the housing (7). A snap-fastening limit groove (72) for defining the position of the snap-fastening member (81) is provided at the top of the through groove (71). The snap-fastening member (81) on the fixing cover (8) passes through the snap-fastening limit groove (72) on the housing (7) to be fixed to the housing (7).

3. The leakage sensor according to claim 2, wherein Two secondary snap-fastening members (82) are also provided on the fixing cover (8), and the two secondary snap-fastening members (82) are respectively located on both sides of the snap-fastening member (81).

4. The leakage sensor according to claim 2, wherein A circular ring (83) is provided on the fixing cover (8) for inserting into the through groove (71) of the housing (7); the snap-fastening member (81) is integrally formed on the circular ring (83). A guiding structure (84) is provided on the circular ring (83), and the guiding structure (84) is a protruding mounting post. An arc-shaped groove (85) for the leakage current detection copper post (4) to pass through is provided in the mounting post.

5. The leakage sensor according to claim 4, wherein, A commutation limit groove (86) for commuting the copper feet of the leakage current detection copper post (4) is further provided at the bottom of the mounting post.

6. The leakage sensor according to claim 2, wherein The upper part of the through groove (71) is circular and the bottom is flat. Several baffle plates (73) are provided on the inner wall of the upper through groove (71), and the baffle plates (73) are arranged parallel to the bottom surface of the housing; when the fixing cover (8) is assembled on the housing (7), the baffle plates (73) are located below the guiding structure (84), and the baffle plates (73) and the guiding structure (84) together form a limiting space for the leakage current detection copper post (4).

7. The leakage sensor according to claim 1, characterized in that, Several card slots (74) for fixing the copper feet of the leakage current detection copper post (4) are provided at the bottom of the surface of the housing (7) close to the fixing cover (8), and the card slots (74) are arranged side by side.

8. The leakage sensor according to claim 7, wherein A second avoidance groove (87) corresponding to the card slot (74) is provided on the fixing cover (8).

9. The leakage sensor according to claim 7, characterized in that, Several support posts (75) for making the upper and lower segments of the leakage current detection copper post (4) in the same vertical plane are provided at the upper part of the surface of the housing (7) close to the fixing cover (8).

10. A charging pile, comprising a host module, a charging module, a power switching module and a protection module, characterized in that, The protection module is internally installed with a leakage sensor as described in any one of claims 1 to 9.

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