Heavy-load electric leakage protection plug

Abstract

The utility model discloses a heavy-load leakage protection plug, which comprises a pin fixing plate, a base, a circuit board, a cross arm, a ground pin connecting piece, a mutual inductor, a live wire moving contact, a null line moving contact, a live wire static contact and a null line static contact, one side of the live wire moving contact piece and one side of the null wire moving contact piece, which are contacted with the live wire static contact and the null wire static contact, are provided with contact pieces, and at least a part of the contact pieces are connected with the live wire moving contact piece and the null wire moving contact piece. According to the utility model, the load current effective part of the movable contact forms a double-layer composite structure, so that the effective sectional area of the large current part is increased by two or more times of the existing effective sectional area, the sectional area of the movable contact can be greatly increased, and meanwhile, the effective closing force of the movable contact and the static contact can be ensured; and the plug can be directly used with the existing socket without integrally replacing the socket or the plug, thereby reducing the manufacturing and use cost.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage protection plugs, in particular to a large-load leakage protection plug. Background Art

[0002] As the power of terminal electrical appliances is increasing, the actual matching plugs or switches have low loads and most of them cannot be used directly. Therefore, it is necessary to improve the load capacity of leakage protection plugs.

[0003] The live and neutral moving contacts of the existing leakage protection plug are against the two ends of the cross arm, and the moving contacts will touch and electrically connect with the static contacts. In general, in order to increase the load, the conventional practice is to directly thicken or widen the moving contact as a whole, which will affect the closing force between the moving and static contacts of the leakage protection plug, easily causing the moving contact to heat up, and the cross arm to deform due to heat. In severe cases, the cross arm will be burned, thereby losing the leakage protection function. In order to increase the closing force, some measures will be taken, such as increasing the tension of the reset spring, which is used to return the moving contact to its original position, but this will reduce the sensitivity of the leakage disconnection and delay the release time, posing a safety hazard and causing the risk of electric shock. Utility Model Content

[0004] The utility model aims to solve the above problems and designs a large-load leakage protection plug, which solves the problem that the existing leakage protection plug is overloaded and not suitable for high-power electrical appliances.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a large-load leakage protection plug, including a pin fixing plate, a base, a circuit board, a cross arm, a ground pin connecting piece, a mutual inductor, a live wire moving contact piece, a neutral wire moving contact piece, a live wire static contact point and a neutral wire static contact point. The base is fixed on the pin fixing plate, the circuit board is fixed above the base, the mutual inductor is located between the circuit board and the base and is electrically connected to the circuit board, the ground pin connecting piece is located below the base and one end of the ground pin connecting piece is electrically connected to the external ground wire, one end of the live wire moving contact piece is electrically connected to the circuit board, and the other end abuts on the arm of the cross arm and can be electrically connected to the live wire static contact point, one end of the neutral wire moving contact piece is electrically connected to the circuit board, and the other end abuts on the other arm of the cross arm and can be electrically connected to the neutral wire static contact point.

[0006] The live wire moving contact piece and the neutral wire moving contact piece are respectively provided with contact pieces on one side in contact with the live wire static contact and the neutral wire static contact, at least a part of the contact piece is connected with the live wire moving contact piece and the neutral wire moving contact piece, and gaps are left between the contact piece and the live wire moving contact piece and the neutral wire moving contact piece.

[0007] Preferably, the middle parts of the live wire moving contact piece and the neutral wire moving contact piece are bent to form an embedding portion, and the embedding portion is embedded in the clamping groove on the base.

[0008] Preferably, a positioning block for positioning the base and a buckle engaged with the base are provided on the pin fixing plate, and a positioning groove matched with the positioning block is provided at the bottom of the base.

[0009] Preferably, the base is provided with a positioning column for positioning the circuit board and a buckle engaged with the circuit board, and the circuit board is provided with a positioning hole matched with the positioning column.

[0010] Preferably, a live wire pin and a neutral wire pin are respectively provided on both sides of the base, the live wire static contact and the neutral wire static contact are respectively provided at the upper ends of the live wire pin and the neutral wire pin, a ground wire pin is provided at the bottom of the base, the ground pin connecting piece is clamped with the ground wire pin, and the lower ends of the live wire pin, the neutral wire pin and the ground wire pin pass through the lower end of the pin fixing plate.

[0011] Preferably, the live wire moving contact piece and the neutral wire moving contact piece are at least partially bent toward one side close to the live wire static contact and the neutral wire static contact to form the contact piece, and at least a portion of the other side of the contact piece is bent to surround the side surfaces of the live wire moving contact piece and the neutral wire moving contact piece.

[0012] Preferably, one side of the contact piece is bent to surround the side surfaces of the live wire moving contact piece and the neutral wire moving contact piece, and is in close contact with the side surfaces of the live wire moving contact piece and the neutral wire moving contact piece, and at least a portion of the other side is bent to surround a portion of the side surfaces of the live wire moving contact piece and the neutral wire moving contact piece.

[0013] Compared with the prior art, the beneficial effects are:

[0014] The contact piece in the utility model is a moving contact piece formed by integral stamping, bending and coating processes.

[0015] The contact piece and the load current effective part of the moving contact piece are combined to form a composite structure, so that the effective cross-sectional area of ​​the large current part is increased by 2 times or more than 2 times of the existing one. While greatly increasing the cross-sectional area of ​​the moving contact piece, the effective closing force of the moving and static contacts can be ensured. This large-load leakage protection plug can be used directly with the existing socket without replacing the socket or plug as a whole, reducing the manufacturing and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the leakage protection plug of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the leakage protection plug of the utility model from another perspective;

[0018] Figure 3 It is a structural schematic diagram of a pin fixing plate in a leakage protection plug;

[0019] Figure 4 It is a structural diagram of the base in the leakage protection plug;

[0020] Figure 5 It is a structural diagram of the live wire moving contact piece or the neutral wire moving contact piece in the leakage protection plug;

[0021] Figure 6 It is a structural schematic diagram of the live wire moving contact or the neutral wire moving contact in the leakage protection plug from another perspective.

[0022] In the figure, 1, pin fixing plate; 2, base; 201, limit plate; 202, slot; 203, buckle; 204, positioning column; 3, circuit board; 4, mutual inductor; 5, neutral line moving contact; 6, neutral line pin; 7, live line pin; 8, ground pin; 9, cross arm; 10, live line moving contact; 11, ground pin connecting piece; 12, positioning block; 13, embedded part; 14, contact piece; 101, neutral line static contact; 102, live line static contact; 103, moving contact. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1-Figure 3 As shown, a preferred embodiment of the utility model proposes a large-load leakage protection plug, which is mainly composed of a pin fixing plate 1, a base 2, a circuit board 3, a cross arm 9, a ground pin connecting piece 11, a mutual inductor 4, a live wire moving contact piece 10, a neutral wire moving contact piece 5, a ground wire pin 8, a live wire pin 7, a neutral wire pin 6 and other components, wherein a limit plate 201, a buckle 203 and a positioning block 12 are arranged on both sides of the upper part of the pin fixing plate 1, and the limit plate 201 is used to limit the two sides of the base 2, and a positioning groove is provided at the bottom of the rear end of the base 2, and the positioning block 12 cooperates with the positioning groove to position the base 2, and the buckle 203 is clamped with the base 2, so as to fix the base 2 on the pin fixing plate 1. The circuit board 3 is located above the base 2, and the base 2 supports and clamps the circuit board 3.

[0025] refer to Figure 4Two buckles 203 and two positioning posts 204 are also provided on the base 2. At the same time, a clamping hole and a positioning hole are also provided at the corresponding position of the circuit board 3. The positioning post 204 is inserted into the positioning hole to position the circuit board 3. The buckle 203 is engaged with the clamping hole, so that the circuit board 3 is fixed on the base 2. The mutual inductor 4 is located between the two positioning grooves at the rear end of the base 2. The mutual inductor 4 is electrically connected to the bottom of the circuit board 3. The mutual inductor plays a role in identifying the leakage current and can monitor and judge the leakage current. When the leakage current reaches a certain value, the winding in the mutual inductor will generate enough voltage to make the leakage protection plug work and cut off the power in time to protect the safety of household electricity.

[0026] refer to Figure 1 , Figure 2 The live wire moving contact piece 10 and the neutral wire moving contact piece 5 are respectively located on both sides of the base 2, wherein the middle parts of the live wire moving contact piece 10 and the neutral wire moving contact piece 5 are bent to form a U-shaped embedding portion 13, and at the same time, a card slot 202 is provided at the rear end of the base 2, located above the positioning slot, and the embedding portion 13 is embedded in the card slot 202, and one end of the live wire moving contact piece 10 and the neutral wire moving contact piece 5 is electrically connected to the bottom of the circuit board 3, and the other end is a moving contact 103, the moving contact 103 of the live wire moving contact piece 10 abuts on the arm of the cross arm 9 and can be electrically connected to the live wire static contact 102, the neutral wire moving contact 103 abuts on the other arm of the cross arm 9 and can be electrically connected to the neutral wire static contact 101, and the cross arm 9 is located on the base 2.

[0027] A three-pin socket is provided on the pin fixing plate 1, each of which is provided with a pin, namely a live pin 7, a neutral pin 6 and a ground pin 8, and the lower ends of the three pins pass through the socket. The live pin 7 and the neutral pin 6 are respectively located on both sides of the base 2 and fixed between the pin fixing plate 1 and the base 2, and the live static contact 102 and the neutral static contact 101 are respectively provided at the upper ends of the live pin 7 and the neutral pin 6.

[0028] like Figure 5 , Figure 6 As shown, in order to improve the load capacity of the moving contact piece, a contact piece 14 is provided on the side of the live moving contact piece 10 and the neutral moving contact piece 5 that are in contact with the static contact. The size of the contact piece 14 is almost the same as the effective part of the load current of the moving contact piece, that is, the size of the contact piece 14 is smaller than that of the moving contact piece.

[0029] The existing moving contact piece is a single-layer structure. In this example, the contact piece 14 and the contact piece 14 form a double-layer composite structure, which can increase the overall cross-sectional area of ​​the moving contact piece. While ensuring the effective closing force of the dynamic and static contacts, it can withstand a greater load. At the same time, it also complies with the national standard for verifying the correct operation standard when residual current occurs during a power failure.

[0030] refer to Figure 5 , Figure 6 In this example, a part of the moving contact piece is usually stamped, bent, and covered to form the contact piece 14. Therefore, the entire side surface of one side of the contact piece 14 is integrally connected to the moving contact piece, and the other side portion is bent downward to surround part of the side surface of the moving contact piece, thereby tightly connecting the contact piece 14 and the moving contact piece. A certain gap is left between the contact piece 14 and the moving contact piece, one is to increase heat dissipation, and the other is to leave a certain displacement distance between the contact piece 14 and the moving contact piece.

[0031] In other technical solutions, both sides of the contact piece 14 may not be integrally connected to the moving contact piece, and both sides of the contact piece 14 are bent to semi-enclose the moving contact piece. Moreover, the entire side surface of one side of the contact piece 14 is bent to be in close contact with the moving contact piece, and the other side surface is partially bent to enclose a part of the side surface of the moving contact piece. In this way, the contact piece 14 is fixed on the moving contact piece while ensuring the effective load area.

[0032] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present utility model. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present utility model and fall within the protection scope of the present utility model.

Claims

1. A heavy-load leakage protection plug, comprising a pin fixing plate (1), a base (2), a circuit board (3), a cross arm (9), a ground pin connecting piece (11), a mutual inductor (4), a live wire moving contact piece (10), a neutral wire moving contact piece (5), a live wire static contact point (102) and a neutral wire static contact point (101), wherein the base (2) is fixed on the pin fixing plate (1), the circuit board (3) is fixed above the base (2), and the mutual inductor (4) is located between the circuit board (3) and the base (2) and is connected to the circuit board (3). The ground connection piece (11) is located below the base (2) and one end of the ground connection piece (11) is electrically connected to an external ground wire; one end of the live wire moving contact piece (10) is electrically connected to the circuit board (3), and the other end abuts against the arm of the cross arm (9) and can be electrically connected to the live wire static contact (102); one end of the neutral wire moving contact piece (5) is electrically connected to the circuit board (3), and the other end abuts against the other arm of the cross arm (9) and can be electrically connected to the neutral wire static contact (101); the invention is characterized in that: A contact piece (14) is provided on the side of the live wire moving contact piece (10) and the neutral wire moving contact piece (5) that are in contact with the live wire static contact (102) and the neutral wire static contact (101), respectively; at least a portion of the contact piece (14) is connected to the live wire moving contact piece (10) and the neutral wire moving contact piece (5), and a gap is left between the contact piece (14) and the live wire moving contact piece (10) and the neutral wire moving contact piece (5).

2. The heavy load leakage protection plug according to claim 1, characterized in that: The middle parts of the live wire moving contact piece (10) and the neutral wire moving contact piece (5) are bent to form an embedding portion (13), and the embedding portion (13) is embedded in the clamping groove (202) on the base (2).

3. The heavy load leakage protection plug according to claim 1, characterized in that: The pin fixing plate (1) is provided with a positioning block (12) for positioning the base (2) and a buckle (203) engaged with the base (2), and the bottom of the base (2) is provided with a positioning groove matched with the positioning block (12).

4. The heavy load leakage protection plug according to claim 1, characterized in that: The base (2) is provided with a positioning column (204) for positioning the circuit board (3) and a buckle (203) engaged with the circuit board (3), and the circuit board (3) is provided with a positioning hole matched with the positioning column (204).

5. The heavy load leakage protection plug according to claim 1, characterized in that: A live wire pin (7) and a neutral wire pin (6) are respectively arranged on both sides of the base (2); the live wire static contact (102) and the neutral wire static contact (101) are respectively arranged at the upper ends of the live wire pin (7) and the neutral wire pin (6); a ground wire pin (8) is arranged at the bottom of the base (2); the ground wire connecting piece (11) is snap-connected with the ground wire pin (8); and the lower ends of the live wire pin (7), the neutral wire pin (6) and the ground wire pin (8) pass through the lower end of the pin fixing plate (1).

6. The heavy load leakage protection plug according to any one of claims 1 to 5, characterized in that: The live wire moving contact piece (10) and the neutral wire moving contact piece (5) are at least partially bent toward a side close to the live wire static contact point (102) and the neutral wire static contact point (101) to form the contact piece (14), and at least a portion of the other side of the contact piece (14) is bent to surround the side surfaces of the live wire moving contact piece (10) and the neutral wire moving contact piece (5).

7. The heavy load leakage protection plug according to any one of claims 1 to 5, characterized in that: One side of the contact piece (14) is bent to surround the side surfaces of the live moving contact piece (10) and the neutral moving contact piece (5), and is in close contact with the side surfaces of the live moving contact piece (10) and the neutral moving contact piece (5), and at least a portion of the other side is bent to surround a portion of the side surfaces of the live moving contact piece (10) and the neutral moving contact piece (5).

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