An electric leakage protection device

Abstract

The utility model discloses a leakage protection device, include: support is equipped with U type groove, and the side wall of U type groove is equipped with limiting groove, and the line board is connected with support fixed, and the one end of movable contact piece is with the line board soldering, and the other end of movable contact piece is fixed with movable contact head, and movable contact piece is equipped with U type fixed part, and the outer side wall of the side of U type fixed part away from movable contact head is equipped with limiting protruding, when U type fixed part embeds to U type groove, limiting protruding is located in limiting groove, through the cooperation of U type fixed part and U type groove, form the effect of fixed location, second, through the cooperation of limiting protruding and limiting groove, further improve movable contact piece and the limiting fixed effect of support, prevent movable contact piece from happening to shake, improve the elastic effect of movable contact piece, improve the stability of whole.

Description

Technical Field

[0001] This utility model relates to the electrical field, specifically to a leakage current protection device. Background Technology

[0002] Existing leakage current protection devices include a moving contact, which has a fixed moving contact. The circuit is connected through the moving contact and the stationary contact, and the circuit is disconnected by separating the moving contact and the stationary contact. The moving contact has a certain degree of elasticity, thus enabling it to reset.

[0003] In existing technology, one end of the moving contact is electrically connected to the input terminal, and the other end of the moving contact is fixed with a moving contact head. The moving contact and the body of the leakage current protection device are engaged by a lever structure to achieve the elastic effect of the moving contact. However, the problem with this structure is that the stability of the connection between the moving contact and the terminal is insufficient, affecting the shape stability of the moving contact (mainly because there is a gap between the terminal and the body, which causes the terminal to shift). Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is how to improve the fixing strength of the moving contact. To this end, a leakage protection device includes:

[0005] The bracket is provided with a U-shaped groove, and the sidewall of the U-shaped groove is provided with a limiting groove;

[0006] A circuit board, which is connected and fixed to the bracket;

[0007] The movable contact piece has one end soldered to the circuit board and the other end fixed with a movable contact. The movable contact piece has a U-shaped fixing part, and the outer side wall of the U-shaped fixing part away from the movable contact has a limiting protrusion. When the U-shaped fixing part is inserted into the U-shaped groove, the limiting protrusion is located in the limiting groove.

[0008] The limiting groove opens upwards, and the limiting protrusion passes through the opening and enters the limiting groove.

[0009] The limiting protrusion is formed by stamping.

[0010] One of the bracket and the circuit board is provided with a snap-fit ​​protrusion, and the other of the bracket and the circuit board is provided with a snap-fit ​​groove that mates with the snap-fit ​​protrusion.

[0011] It also includes a pressure block and a body. The body is provided with a first pressure groove, the pressure block is provided with a second pressure groove above it, and the pressure block is provided with a third pressure groove below it. The first pressure groove is connected to the second pressure groove, or the first pressure groove is connected to the third pressure groove. The size of the second pressure groove is different from the size of the third pressure groove.

[0012] The inner wall of the first pressure groove is provided with a first rib, and the side wall of the pressure block is provided with a second rib, with the first rib abutting against the second rib.

[0013] It also includes a wiring assembly, which includes a wiring screw, a wiring piece, and a wiring nut. The wiring screw includes a wire clamping part and a screw part. The screw part passes through the wiring piece and connects to the wiring nut. The wire is located between the wire clamping part and the wiring piece.

[0014] It also includes a body, which has a fixing cavity, and the wiring nut is fixed in the fixing cavity.

[0015] The wire pressing part has a wire pressing protrusion on the side facing the connector; or, the connector has a plurality of equally spaced grooves on the side facing the wire pressing part.

[0016] It also includes a grounding assembly, which includes a grounding pin and a connecting wire. The grounding pin is provided with a riveting part, one end of the connecting wire is riveted to the riveting part, and the other end of the connecting wire is soldered to the circuit board.

[0017] The technical solution of this utility model has the following advantages:

[0018] 1. The leakage protection device provided by this utility model achieves a positioning and fixing effect through the cooperation of the U-shaped fixing part and the U-shaped groove. Secondly, the limiting protrusion and the limiting groove further improve the limiting and fixing effect of the moving contact and the bracket, prevent the moving contact from shaking, improve the elasticity of the moving contact, and improve the overall stability.

[0019] 2. The leakage current protection device provided by this utility model has an opening that creates a guiding effect. During installation, the limiting protrusion enters the limiting groove along the opening direction, improving the ease of installation. Alternatively, it can be designed with a closed opening, where the elasticity of the U-shaped fixing part allows it to pass over the upper part of the U-shaped groove until the limiting protrusion enters the limiting groove.

[0020] 3. The leakage protection device provided by this utility model has a stamping and forming design, which makes the processing of the moving contact piece more convenient.

[0021] 4. The leakage protection device provided by this utility model has a locking protrusion and a locking groove that make the connection between the bracket and the circuit board more convenient.

[0022] 5. The leakage protection device provided by this utility model has a universal effect by setting the second and third wire pressing grooves, which increases the wire pressing range and meets the requirements for fixing wires of different diameters.

[0023] 6. The leakage protection device provided by this utility model has a first rib and a second rib abutting each other to form a limiting and fixing effect, preventing the pressure block from falling off and separating.

[0024] 7. The leakage protection device provided by this utility model, through the cooperation of the wiring screw and the wiring nut, has a stronger fixing strength for the wiring screw compared with the prior art (which uses a structure of stamping studs and tapping threads on the wiring piece), and can also prevent the wiring piece from breaking.

[0025] 8. The leakage protection device provided by this utility model has a fixing cavity that forms a fixing effect for the wiring nut, preventing the wiring nut from turning during the tightening process.

[0026] 9. The leakage protection device provided by this utility model has both the wire protrusion and the groove that increase the contact area and improve the wire pressing quality.

[0027] 10. The leakage protection device provided by this utility model uses a connecting wire for connection. Compared with the conductive sheet structure, the connecting wire is easier to run, does not require special space avoidance, and reduces the difficulty of wiring. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the leakage current protection device provided by this utility model;

[0030] Figure 2 Exploded view of the leakage current protection device provided by this utility model;

[0031] Figure 3 A schematic diagram of the mechanism module provided by this utility model;

[0032] Figure 4 Exploded view of the movement module provided by this utility model;

[0033] Figure 5 Exploded view of the movable contact piece and bracket provided by this utility model;

[0034] Figure 6 A cross-sectional view showing the interaction between the movable contact piece and the bracket provided by this utility model;

[0035] Figure 7 A schematic diagram of the wiring assembly provided by this utility model;

[0036] Figure 8 Exploded view of the base and wiring nut provided for this utility model;

[0037] Figure 9 This is a schematic diagram of the structure of the pressure block provided by this utility model;

[0038] Figure 10 Exploded view of the pressure block and back cover provided by this utility model.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Top cover; 2. Reset button; 3. Test button; 4. Button sealing gasket; 5. Mechanism module; 6. Base; 9. Wire clamping block; 10. Back cover; 11. Snap-fit ​​protrusion; 12. Slot; 13. Fixing cavity; 501. Circuit board; 502. Reset rod; 503. Coil assembly; 504. Reset spring; 505. L-end insert; 506. N-end insert; 507. Moving contact piece; 508. Trip unit; 509. Magnetic ring module; 510. Bracket; 511. Grounding assembly; 5071. Limiting protrusion ; 5072, U-shaped fixing part; 5073, moving contact; 5101, limiting groove; 5102, opening; 5103, U-shaped groove; 81, wiring screw; 82, wiring piece; 83, wiring nut; 811, wire pressing part; 812, screw part; 813, wire pressing protrusion; 821, groove; 91, second wire pressing groove; 92, third wire pressing groove; 93, second rib; 101, first wire pressing groove; 102, first rib; 5111, grounding foot; 5112, connecting wire; 5113, riveting part. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] This embodiment provides a leakage current protection device, as shown in the attached figure. Figures 1-10 As shown, it includes:

[0047] The bracket 510 has a U-shaped groove 5103, which is oriented upwards, that is, towards the circuit board 501. The side wall of the U-shaped groove 5103 has a limiting groove 5101.

[0048] Circuit board 501 is connected and fixed to bracket 510, forming a whole.

[0049] The movable contact 507 can be one (for live wire connection) or two. This embodiment describes two movable contacts 507 as an example. The two movable contacts 507 have identical structures; only one is described here. One end of the movable contact 507 is soldered to the circuit board 501. After soldering, the movable contact 507 is fixed to the circuit board 501, and they also form an electrical connection. The other end of the movable contact 507 is fixed with a movable contact 5073, which is used to cooperate with the stationary contact. This is prior art and will not be described in detail. The movable contact 507 has a U-shaped fixing part 5072, which is U-shaped and also faces upwards. One side of the U-shaped fixing part 5072 extends to connect with the moving contact 5073, and the other side extends to connect with the circuit board 501. In this embodiment, the left side of the U-shaped fixing part 5072 extends to connect with the moving contact 5073, and the right side of the U-shaped fixing part 5072 extends to connect with the circuit board 501. A limiting protrusion 5071 is provided on the outer wall of the side of the U-shaped fixing part 5072 away from the moving contact 5073. The limiting protrusion 5071 is located on the outer wall of the right side of the U-shaped fixing part 5072. When the U-shaped fixing part 5072 is inserted into the U-shaped groove 5103, the U-shaped fixing part 5072 and the U-shaped groove 5103 form a fixed support area, so that the position of the moving contact 5073 has a stable elastic effect, which can realize rapid reset. At this time, the limiting protrusion 5071 is located in the limiting groove 5101. The cooperation between the limiting protrusion 5071 and the limiting groove 5101 restricts the movement of the moving contact piece 507, so that the moving contact piece 507 and the bracket 510 form a limiting and fixed effect. Through the cooperation between the U-shaped fixing part 5072 and the U-shaped groove 5103, a positioning and fixing effect is formed. Secondly, through the cooperation between the limiting protrusion 5071 and the limiting groove 5101, the limiting and fixing effect between the moving contact piece 507 and the bracket 510 is further improved, preventing the moving contact piece 507 from shaking, improving the elasticity of the moving contact piece 507, and improving the overall stability.

[0050] Specifically, as shown in the attached document Figures 5-6 As shown, the limiting groove 5101 faces the upward opening 5102, which faces the circuit board 501. The limiting protrusion 5071 passes through the opening 5102 and enters the limiting groove 5101. The opening 5102 provides a guiding effect, allowing the limiting protrusion 5071 to enter the limiting groove 5101 along the direction of the opening 5102 during installation, improving ease of installation. Alternatively, it can be a closed opening, where the elasticity of the U-shaped fixing part 5072 allows it to pass over the upper part of the U-shaped groove 5103 until the limiting protrusion 5071 enters the limiting groove 5101.

[0051] Specifically, as shown in the attached document Figures 5-6As shown, the limiting protrusion 5071 is formed by stamping. The stamping process makes the moving contact piece 507 easier to process.

[0052] Specifically, as shown in the attached document Figures 2-4 As shown, one of the bracket 510 and the circuit board 501 is provided with a snap-fit ​​protrusion 11, and the other of the bracket 510 and the circuit board 501 is provided with a slot 12 that mates with the snap-fit ​​protrusion 11. The engagement of the snap-fit ​​protrusion 11 and the slot 12 makes the connection between the bracket 510 and the circuit board 501 more convenient. When the bracket 510 is provided with the snap-fit ​​protrusion 11, the circuit board 501 is provided with the slot 12; conversely, when the bracket 510 is provided with the slot 12, the circuit board 501 is provided with the snap-fit ​​protrusion 11. In this embodiment, the example of the bracket 510 being provided with the snap-fit ​​protrusion 11 and the circuit board 501 being provided with the slot 12 is described.

[0053] Specifically, as shown in the attached document Figures 9-10 As shown, the device also includes a wire clamping block 9 and a main body. The main body has a first wire clamping groove 101, a second wire clamping groove 91 above the wire clamping block 9, and a third wire clamping groove 92 below the wire clamping block 9. The wire clamping block 9 is inserted into the first wire clamping groove 101, thus connecting the first wire clamping groove 101 and the second wire clamping groove 91. Alternatively, the wire clamping block 9 can be inverted and inserted into the first wire clamping groove 101, thus connecting the first wire clamping groove 101 and the third wire clamping groove 92. Here, the dimensions of the second wire clamping groove 91 and the third wire clamping groove 92 are different. The setting of the second wire clamping groove 91 and the third wire clamping groove 92 has a universal effect, increasing the wire clamping range and satisfying the wire clamping and fixing of wires with different diameters. In this embodiment, the shape and size of the second wire clamping groove 91 and the third wire clamping groove 92 can be replaced. In addition, other structures of wire clamping blocks 9 can be used for quick replacement, thereby achieving compatibility with wire gauges from 3*0.75mm² to 3*15mm².

[0054] Specifically, as shown in the attached document Figures 9-10 As shown, the inner wall of the first pressure groove 101 is provided with a first protruding rib 102, and the side wall of the pressure block 9 is provided with a second protruding rib 93. The first protruding rib 102 and the second protruding rib 93 abut against each other. The abutment of the first protruding rib 102 and the second protruding rib 93 forms a limiting and fixing effect, preventing the pressure block 9 from falling off and separating. Here, the first protruding rib 102 and the second protruding rib 93 form an interference fit effect. There are two first protruding ribs 102 and two second protruding ribs 93, forming a mutually cooperating effect.

[0055] Specifically, as shown in the attached document Figures 9-10 As shown, the main body here includes a back cover 10, and a first pressure groove 101 is disposed on the back cover 10.

[0056] Specifically, as shown in the attached document Figures 7-8As shown, the system also includes a wiring assembly, which comprises a wiring screw 81, a wiring tab 82, and a wiring nut 83. The wiring screw 81 includes a wire clamping part 811 and a screw part 812. The screw part 812 passes through the wiring tab 82 and connects to the wiring nut 83. The wire is located between the wire clamping part 811 and the wiring tab 82. Here, the wire clamping part 811 has a plate-shaped structure, and the wire clamping part 811 cooperates with the wiring tab 82 to form a wire clamping effect. Through the cooperation of the wiring screw 81 and the wiring nut 83, compared with the prior art (which uses a flanging and tapping process on the wiring tab 82, which is prone to stripping and insufficient screw torque, resulting in unreliable wiring and fire risks), this structure provides greater fixing strength for the wiring screw 81 and also prevents the wiring tab 82 from breaking.

[0057] Specifically, as shown in the attached document Figures 7-8 As shown, it also includes a main body, which has a fixing cavity 13, and the wiring nut 83 is fixed in the fixing cavity 13. The fixing cavity 13 provides a fixing effect for the wiring nut 83, preventing the wiring nut 83 from rotating during the tightening process. For example, when the wiring nut 83 is a regular hexagonal prism, the fixing cavity 13 is also a regular hexagonal prism structure.

[0058] Specifically, as shown in the attached document Figures 7-8 As shown, the wire pressing portion 811 has a wire pressing protrusion 813 on the side facing the connector 82; or, the connector 82 has a plurality of equally spaced grooves 821 on the side facing the wire pressing portion 811. Both the wire pressing protrusion 813 and the grooves 821 increase the contact area and improve the wire pressing quality.

[0059] Specifically, the main body also includes a base 6, and a fixing cavity 13 is disposed on the base 6. The lower right side area of ​​the base 6 is connected and fixed to the back cover 10.

[0060] Specifically, the main body also includes an upper cover 1, which is connected and fixed to the upper area of ​​the base 6. The movement module 5 is located in the cavity between the upper cover 1 and the base 6.

[0061] Specifically, as shown in the attached document Figure 4 As shown, it also includes a grounding assembly 511, which includes a grounding pin 5111 and a connecting wire 5112. The grounding pin 5111 is provided with a riveting part 5113. One end of the connecting wire 5112 is riveted to the riveting part 5113, and the other end of the connecting wire 5112 is soldered to the circuit board 501. Compared with the conductive sheet structure, the connecting wire 5112 is easier to route, does not require special space avoidance, and reduces the difficulty of routing.

[0062] Specifically, as shown in the attached document Figures 3-4As shown, the mechanism module 5 includes a circuit board 501, a reset rod 502, a coil assembly 503, a reset spring 504, an L-end insert 505, an N-end insert 506, a trip unit 508, a magnetic ring module 509, a bracket 510, and a grounding assembly 511. The circuit board 501 is connected and fixed to the bracket 510. The coil assembly 503, reset rod 502, and reset spring 504 are all fixed within the bracket 510. The reset rod 502 and reset spring 504 cooperate to achieve a reset effect. The coil assembly 503 is electrically connected to the circuit board 501, and the circuit board 501 controls the operation of the coil assembly 503. The coil assembly 503 cooperates with the trip unit 508 to achieve the effect of the trip unit 508 driving the moving contact 507 to move, thus connecting or disconnecting the moving contact 5073 from the stationary contact. The L-end insert 505 and N-end insert 506 both have stationary contacts, corresponding to two moving contacts 507 respectively. The magnetic ring module 509 is electrically connected to the circuit board 501 and is used to detect signals in the circuit. Then, it transmits the signals to the circuit board 501 to determine whether the circuit is normal. The L-end plug 505, the N-end plug 506, and the ground wire assembly 511 all partially extend out of the base 6 to form a plug structure for connecting to an external power supply to provide power.

[0063] Specifically, as shown in the attached document Figures 3-4 As shown, it also includes a reset button 2 and a test button 3. The reset button 2 is located on the top surface of the upper cover 1, and the test button 3 is also located on the top surface of the upper cover 1. The reset button 2 works in conjunction with the reset lever 502. When the reset button 2 is pressed, it will cause the reset lever 502 to move. The test button 3 works in conjunction with the circuit board 501 to generate a test signal.

[0064] Specifically, the inner sidewall of the top surface of the top cover 1 is also fitted with a button sealing gasket 4 that cooperates with the reset button 2 and the test button 3. The overall sealing and protection effect is improved by setting the button sealing gasket 4.

[0065] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A leakage current protection device, characterized in that, include: A bracket (510) is provided with a U-shaped groove (5103), and a limiting groove (5101) is provided on the side wall of the U-shaped groove (5103); Circuit board (501), wherein the circuit board (501) is connected and fixed to the bracket (510); A movable contact (507) is provided. One end of the movable contact (507) is soldered to the circuit board (501). The other end of the movable contact (507) is fixed with a movable contact (5073). The movable contact (507) is provided with a U-shaped fixing part (5072). The outer side wall of the U-shaped fixing part (5072) away from the movable contact (5073) is provided with a limiting protrusion (5071). When the U-shaped fixing part (5072) is embedded into the U-shaped groove (5103), the limiting protrusion (5071) is located in the limiting groove (5101).

2. The leakage current protection device according to claim 1, characterized in that, The limiting groove (5101) faces the upward opening (5102), and the limiting protrusion (5071) passes through the opening (5102) and enters the limiting groove (5101).

3. The leakage current protection device according to claim 1 or 2, characterized in that, The limiting protrusion (5071) is formed by stamping.

4. The leakage current protection device according to claim 1, characterized in that, One of the bracket (510) and the circuit board (501) is provided with a snap-fit ​​protrusion (11), and the other of the bracket (510) and the circuit board (501) is provided with a slot (12) that mates with the snap-fit ​​protrusion (11).

5. The leakage current protection device according to claim 1, characterized in that, It also includes a wire pressing block (9) and a body. The body is provided with a first wire pressing groove (101), a second wire pressing groove (91) is provided above the wire pressing block (9), and a third wire pressing groove (92) is provided below the wire pressing block (9). The first wire pressing groove (101) is connected to the second wire pressing groove (91), or the first wire pressing groove (101) is connected to the third wire pressing groove (92). The size of the second wire pressing groove (91) is not the same as the size of the second wire pressing groove (92).

6. The leakage current protection device according to claim 5, characterized in that, The inner wall of the first pressure groove (101) is provided with a first rib (102), and the side wall of the pressure block (9) is provided with a second rib (93). The first rib (102) and the second rib (93) abut against each other.

7. The leakage current protection device according to claim 1, characterized in that, It also includes a wiring assembly, which includes a wiring screw (81), a wiring piece (82), and a wiring nut (83). The wiring screw (81) includes a wire clamping part (811) and a screw part (812). The screw part (812) passes through the wiring piece (82) and connects to the wiring nut (83). The wire is located between the wire clamping part (811) and the wiring piece (82).

8. The leakage current protection device according to claim 7, characterized in that, It also includes a body, which has a fixing cavity (13), and the wiring nut (83) is fixed in the fixing cavity (13).

9. The leakage current protection device according to claim 7, characterized in that, The wire pressing part (811) has a wire pressing protrusion (813) on the side facing the connector (82); or, the connector (82) has a plurality of equally spaced grooves (821) on the side facing the wire pressing part (811).

10. The leakage current protection device according to claim 1, characterized in that, It also includes a grounding assembly (511), which includes a grounding pin (5111) and a connecting wire (5112). The grounding pin (5111) is provided with a riveting part (5113). One end of the connecting wire (5112) is riveted to the riveting part (5113), and the other end of the connecting wire (5112) is soldered to the circuit board (501).

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