CN114078666A - Maintenance type earth leakage protector - Google Patents

Abstract

The invention discloses a maintenance type leakage protector, relating to the technical field of leakage protectors, comprising: the leakage protection device comprises a reset key, a reset stop block, an electromagnetic driving device and an elastic sheet; the base is also provided with an electric connection end which can be electrically connected with the elastic sheet; the bottom of the reset key is provided with a first reset spring; the reset key penetrates through the upper cover plate and is inserted into the reset baffle block, the reset key can drive the reset baffle block to synchronously move through the clamping sheet, the reset baffle block can drive the elastic sheet to move downwards and be separated from the power connection end to realize power failure by pressing down the reset key, and the reset key can drive the elastic sheet to move upwards and be contacted with the power connection end to realize power failure by resetting and moving upwards under the action of the first reset spring; the invention maintains the closed state of the leakage protector by adopting a mode of continuously supplying power to the electromagnetic driving device, attracting and clamping, and when the leakage protector is in power interruption, poor contact and phase loss, the leakage protector is actively separated to cut off the power, thereby avoiding potential safety hazards.

Description

Maintenance type earth leakage protector

Technical Field

The invention relates to the technical field of leakage protectors, in particular to a maintenance type leakage protector.

Background

When the equipment has leakage fault or needs to protect the person with fatal danger from electric shock, the leakage protector can disconnect the main circuit in time, thereby being widely applied; the application technology of the leakage protector is mature, and the leakage protector is divided into a voltage type and a current type according to the protection principle. From the mechanical structure, there are self-locking type and attraction type, but the current or voltage mechanical self-locking type leakage protector is mainly used. The biggest characteristic of the mechanical self-locking structure is as follows: when the power supply of the working leakage protector is interrupted or the power supply loop is in phase failure and the line is in poor contact, the mechanical self-locking structure of the leakage protector in a closed state can not actively disconnect the closed contact, and at the moment, if the power supply loop is in abnormal phase failure and the ground wire is in abnormal electrification or leaks electricity, the leakage protector loses the protection effect, so that safety accidents are caused;

aiming at the problems, the invention designs a self-release structure, a coil continuous power supply pull-in release mechanism is adopted, when power supply is interrupted, contact is poor and phase is lost, the pull-in holding loop of the structure cannot generate magnetic force to attract the self-release mechanism due to voltage loss, so that the release loop is disconnected, and a closed contact is disconnected, thereby forming active protection and avoiding potential safety hazard.

Disclosure of Invention

First, technical problem to be solved

The invention provides a maintenance type leakage protector aiming at the defects in the prior art, solves the problem of complex structure of the existing leakage protector, and also solves the problem that the existing leakage protector can be broken only under the condition of power-on.

Second, technical scheme

To solve the above technical problem, the present invention provides a maintenance-type leakage protector, comprising: the leakage protection device comprises a reset key, a reset stop block, an electromagnetic driving device and an elastic sheet; the base is also provided with an electric connection end which can be electrically connected with the elastic sheet;

the reset stop block is movably arranged on the upper part of the base up and down, and is provided with an extending end which can be abutted against the elastic sheet; the electromagnetic driving device is arranged on one side of the upper part of the base and comprises a driving iron core and a clamping piece, the driving iron core extends out of the electromagnetic driving device and is movably clamped with the clamping piece, the electromagnetic driving device can drive the driving iron core to move so as to drive the clamping piece to move, and a clamping groove for the clamping piece to insert is formed in the reset stop block;

the bottom of the reset key is provided with a first reset spring, the reset key penetrates through the upper cover plate and is inserted into the reset baffle block, the reset key can drive the reset baffle block to synchronously move through the clamping sheet, the reset baffle block can drive the elastic sheet to move downwards and is separated from the power connection end to cut off the power by pressing down the reset key, and the reset key can drive the elastic sheet to move upwards and is contacted with the power connection end to cut on the power by resetting and upwards moving under the action of the first reset spring;

the electromagnetic driving device in the continuous power-on state can enable the driving iron core to continuously strain the clamping piece, the clamping piece is continuously clamped with the reset key, and the reset key can enable the elastic piece to be in the power-on state in contact with the power connection end through the reset stop block.

After the electromagnetic driving device is powered off, the driving iron core does not tension the clamping sheet, the clamping sheet is separated from the reset key in a clamping state, and the elastic sheet is separated from the power connection end under the action of self elasticity to be powered off.

Wherein, reset button is equipped with a bayonet socket with buckle piece joint cooperation, and the bayonet socket is equipped with upper joint face and the lower inclined plane of dropout.

The clamping piece is a bent metal piece, one end of the clamping piece is provided with a U-shaped opening, the other end of the clamping piece is provided with a key hole, the U-shaped opening is used for being clamped with the driving iron core, the key hole can be used for enabling the reset key to penetrate through, and one edge of the key hole can be matched with the bayonet in a clamped mode.

After the electromagnetic driving device loses power, the driving iron core does not tension the buckling piece, the reset key moves upwards under the action of the first reset spring, and in the upward movement process of the reset key, the buckling piece slides out along the lower inclined surface of the reset key and is separated from a clamping state with the reset key.

The electric connection end is of a pin structure and comprises a zero line pin, a live wire pin and a ground wire pin, the elastic pieces comprise a zero line elastic piece and a live wire elastic piece, the zero line pin corresponds to the zero line elastic piece in position, the live wire pin corresponds to the live wire elastic piece in position, and the ground wire pin is directly connected with the ground wire; the two extending ends are located on two sides of the reset stop block and arranged on the lower portions of the zero line elastic piece and the live line elastic piece, and the zero line elastic piece and the live line elastic piece can automatically move downwards under the action of self elasticity.

The electric connection end is of a pin structure and comprises a zero line pin, a live line pin and a ground wire pin, the elastic pieces comprise a zero line elastic piece, a live line elastic piece and a ground wire elastic piece, the zero line pin corresponds to the zero line elastic piece in position, the live line pin corresponds to the live line elastic piece in position, and the ground wire pin corresponds to the ground wire elastic piece in position; the two extending ends are positioned at two sides of the reset stop block and are arranged at the lower parts of the zero line elastic sheet and the live line elastic sheet, and the zero line elastic sheet and the live line elastic sheet can automatically move downwards under the action of self elasticity; the third extending end is positioned at the bottom of the reset stop block and arranged at the top of the ground wire elastic sheet for controlling the ground wire elastic sheet to move downwards, and the ground wire elastic sheet can automatically move upwards under the action of self elasticity.

The leakage protection device further comprises a pressing guide block, the pressing guide block is clamped and arranged on one side of the upper portion of the base, and a pressing end used for pressing and fixing the plug pins on the base is arranged on the pressing guide block;

the top of the base is provided with a sliding groove which can enable the reset stop block to be inserted into the base from top to bottom, and the reset stop block can move up and down relative to the sliding groove.

Wherein, the pin and the spring plate are embedded on the base.

The key rod which is arranged on the extending end of the bottom of the reset check block and can be used for the reset key passes through the through hole, one end of the first reset spring is abutted to the base, and the other end of the first reset spring is abutted to the bottom of the reset key.

The base is provided with a base, a reset stop block is arranged at the bottom of the base, a base plate is arranged on the base, a base is arranged on the base, a first reset spring is arranged on the base, a second reset spring is arranged on the base, and the base is provided with a ground wire elastic sheet.

Wherein, reset key upper portion cover is equipped with second reset spring, and second reset spring one end and upper cover plate upper portion butt, the second reset spring other end and the button butt that resets.

Third, beneficial effect

Compared with the prior art, the maintaining type leakage protector provided by the invention maintains the closed state of the leakage protector by adopting a mode of continuously supplying power to the electromagnetic driving device to attract and clamp, when the leakage protector is in power interruption, poor contact and phase failure, the electromagnetic driving device cannot generate magnetic force due to voltage loss, so that the clamping structure of the bayonet and the clamping piece is not clamped, and further the reset key and the reset stop block are in a separation state without linkage, so that the leakage protector is separated to cut off the power, active protection is formed, and potential safety hazards are avoided.

Drawings

Fig. 1 is a perspective view of the earth leakage protector in an off state;

fig. 2 is a perspective view of the leakage protector in a closed state;

fig. 3 is an exploded view of the earth leakage protector of the present invention;

FIG. 4 is a perspective view of the base of the present invention;

FIG. 5 is a perspective view of a locking tab of the present invention;

FIG. 6 is a block diagram of the reset button and electromagnetic actuator portion of the present invention, as shown in FIG. 1;

FIG. 7 is a block diagram of the reset button and electromagnetic actuator portion of the present invention, FIG. 2;

FIG. 8 is a block diagram of the reset button and electromagnetic actuator portion of the present invention, FIG. 3;

FIG. 9 is a perspective view of the reset stop of the present invention;

FIG. 10 is a structural diagram of a reset button, an electromagnetic driving device and a ground wire spring part in accordance with an embodiment 2 of the present invention;

FIG. 11 is a diagram of the structure of the reset button, the electromagnetic driving device and the ground spring of the embodiment 1 of the present invention;

FIG. 12 is a diagram of the structure of a reset button, an electromagnetic driving device and a ground spring of the present invention in accordance with embodiment 3;

fig. 13 is an exploded view of embodiment 3 of the earth-leakage protector;

in the figure: 1 is a lower tripping inclined plane; 2 is a base; 3 is an upper cover plate; 4 is a leakage protection device; 5 is a zero line pin; 6 is a live wire pin; 7 is a ground wire pin; 8 is a pin; 9 is a spring plate; 10 is a reset key; 11 is an upper clamping surface; 12 is a reset stop block; 13 is a pressing guide block; 14 is an electromagnetic driving device; 15 is a zero line spring plate; 16 is a live wire shrapnel; 17 is a ground wire shrapnel; 18 is a U-shaped opening; 19 is an electrical connection contact; 20 is a bayonet; 21 is a first return spring; 22 is a key hole; 23 is a driving iron core; 24 is a buckling piece; 25 is a key body; 26 is a fastening groove; 27 is a key lever; 28 is a sliding groove; 29 is a ground wire shrapnel through hole; 30 is a second return spring; 31 is a pressing end; and 32 is a protruding end.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1:

a maintenance-type leakage protector according to an embodiment of the present invention, as shown in fig. 1 to 9, includes: the leakage protection device 4 comprises a base 2, an upper cover plate 3 and a leakage protection device 4, wherein the leakage protection device 4 comprises a reset key 10, a reset stop block 12, an electromagnetic driving device 14 and an elastic sheet 9; the base 2 is also provided with an electric connection end 8 which can be electrically connected with the elastic sheet 9, the electric connection end 8 and the elastic sheet 9 are embedded on the base 2, and the upper cover plate 3 can adopt a partition plate made of plastics or other materials which only can support the first return spring 21 and also can play the same role by adopting a circuit board;

as shown in fig. 3, the leakage protection device 4 further comprises a pressing guide block 13, the pressing guide block 13 is clamped and arranged on one side of the upper portion of the base 2, the pressing guide block 13 is positioned and fixed through a clamping groove correspondingly arranged on the base 2, and a pressing end 31 used for pressing and fixing the electric connection end 8 on the base 2 is arranged on the pressing guide block 13; the reset stop 12 can be movably mounted at the middle position of the upper part of the base 2 up and down, specifically, the top of the base 2 is provided with a sliding groove 28 which can enable the reset stop 12 to be inserted into the base 2 from top to bottom, the reset stop 12 can move up and down relative to the sliding groove 28, the reset stop 12 is provided with a protruding end 32 which can be abutted against the elastic sheet 9, and specifically, the contact and separation of the elastic sheet 9 and the power connection end 8 can be controlled through the protruding end 32; the electromagnetic driving device 14 is arranged on the other side of the upper part of the base 2, the electromagnetic driving device 14 comprises a driving iron core 23 and a clamping piece 24, the driving iron core 23 extends out of the electromagnetic driving device 14, the driving iron core 23 is movably clamped with the clamping piece 24, the electromagnetic driving device 14 can drive the driving iron core 23 to move so as to drive the clamping piece 24 to move, the electromagnetic driving device 14 specifically adopts a magnetic force mode generated by electrifying an electromagnetic coil, and the reset stop block 12 is provided with a clamping groove 26 for the clamping piece 24 to insert;

as shown in fig. 1, in this embodiment, the reset key 10 includes a key body 25 and a key rod 27, and a first reset spring 21 is disposed at the bottom of the key rod 27; one end of the first reset spring 21 can be directly abutted with the base 2, or a spring fixing block is arranged at the end part of the first reset spring 21 and is abutted with the base 2 through the spring fixing block, the other end of the first reset spring 21 is abutted with the bottom of the reset key 10, and the first reset spring 21 is positioned or limited through a corresponding guide sleeve or guide column and other structures; reset button 10 passes upper cover plate 3 and inserts in the dog 12 that resets to accessible buckle piece 22 makes reset button 10 drive dog 12 synchronous motion that resets, specifically, reset button 10 is equipped with one with buckle piece 22 joint complex bayonet socket 20, is equipped with bayonet socket 20 on and blocks surface 11 and dropout down slope 1, bayonet socket 20 is the opening of a similar "7" font promptly, and bayonet socket 20's opening direction deviates from electromagnetic drive device 14.

Moreover, the buckling piece 22 is a bent metal sheet, the bending angle is about 90 °, one end of the buckling piece 22 is provided with a U-shaped opening 18, the U-shaped opening 18 is vertically arranged, the other end of the buckling piece 22 is provided with a key opening 22, the key opening 22 is transversely arranged, the U-shaped opening 18 is used for being clamped with the driving iron core 23, the key opening 22 can be used for the reset key 10 to pass through, and one edge of the key opening 22 can be clamped and matched with the bayonet 20, namely, the position a shown in fig. 5 and 7 is clamped and matched with the bayonet 20; specifically, the end of the driving iron core 23 is provided with a slot matching with the U-shaped opening 18, that is, when the driving iron core 23 contracts into the electromagnetic driving device 14 under the magnetic force of the electromagnetic driving device 14, that is, the distance that the driving iron core 23 extends outward becomes short, and at this time, when the key rod 27 at the bottom of the reset key 10 is located at a proper position, the bayonet 20 on the key rod 27 is in snap fit with the snap piece 22, and under the continuous action of the electromagnetic driving device 14, the bayonet 20 on the key rod 27 and the snap piece 22 maintain a snap fit state.

In the specific operation process of the earth leakage protector of this embodiment, when the bayonet 20 and the fastening piece 22 are kept in a clamping fit state, the reset key 10 is pressed down, so that the reset stop 12 drives the elastic sheet 9 to move down and separate from the power connection terminal 8, thereby powering off, or because the reset stop 12 moves down, the elastic sheet 9 moves down with the elastic force of itself, thereby separating from the power connection terminal 8 and powering off; when the reset key 10 is not pressed any more, the reset key 10 resets and moves upwards under the action of the first reset spring 21, so that the reset stop 12 drives the elastic sheet 9 to move upwards and is contacted with the power connection end 8 to be electrified; namely, the electromagnetic driving device 14 in the continuous power-on state can make the driving iron core 23 continuously tension the buckling piece 22, and make the buckling piece 22 continuously clamped with the reset key 10, and the reset key 10 can make the elastic sheet 9 and the power-on end 8 keep in the power-on state through the reset stop 12.

When the electromagnetic driving device 14 loses power, the driving iron core 23 does not strain the buckling piece 22, the buckling piece 22 is separated from the reset key 10 in a clamping state, and the elastic piece 9 is separated from the power connection end 8 under the action of the elastic force of the elastic piece to cut off the power; specifically, after the electromagnetic driving device 14 loses power, the reset key 10 moves upward under the action of the first reset spring 21, and in the upward movement process of the reset key 10, the buckling piece 22 slides out along the tripping lower inclined surface 1 of the reset key 10 and is separated from the clamping state with the reset key 10 due to the loss of the pulling force applied to the buckling piece by the driving iron core 23, that is, in this state, the key rod 27 of the reset key 10 is not in the limit state, the reset key 10 and the reset stop 12 are in the separation state which cannot be linked, and at this time, the elastic piece 9 moves downward under the action of self elasticity and is separated from the power connection end 8 to cut off the power.

In the embodiment, the structure design is adopted, the electromagnetic driving device 14 is adopted to continuously supply power for the attraction and clamping, so that the leakage protector is in power interruption when meeting, poor contact and phase loss, the attraction and clamping structure of the electromagnetic driving device 14 cannot generate magnetic force due to voltage loss, the clamping structure of the bayonet 20 and the clamping piece 22 is not clamped, the reset key 10 and the reset stop block 12 are in a separation state incapable of linkage, the leakage protector is separated to form active protection when power failure, and potential safety hazards are avoided.

As shown in fig. 3, in the present embodiment, the power connection terminal 8 is a pin structure, and includes a null pin 5, a live pin 6 and a ground pin 7, the elastic pieces 9 include a null elastic piece 15 and a live elastic piece 16, and there is no ground elastic piece, the null pin 5 corresponds to the null elastic piece 15, the live pin 6 corresponds to the live elastic piece 16, and the ground pin 7 is directly connected to the ground wire or connected to the ground wire through a circuit board; two extending ends 32 are arranged, as shown in fig. 11, the two extending ends 32 are located at two sides of the reset stop 12 and are arranged at the lower parts of the zero line spring plate 15 and the live line spring plate 16, the zero line spring plate 15 and the live line spring plate 16 can automatically move downwards under the action of self elasticity, and the electric connection ends 8 and the spring plates 9 are both provided with corresponding electric connection contacts 19 for ensuring the stability and reliability of electric connection; the extended end 32 at the bottom of the reset block 12 is provided with a through hole for the key rod 27 of the reset key 10 to pass through.

Example 2:

as shown in fig. 3, compared to embodiment 1, in this embodiment, the electric connection terminal 8 is a pin structure, and includes a null pin 5, a live pin 6 and a ground pin 7, the elastic piece 9 includes a null spring piece 15, a live spring piece 16 and a ground spring piece 17, the null pin 5 corresponds to the null spring piece 15, the live pin 6 corresponds to the live spring piece 16, and the ground pin 7 corresponds to the ground spring piece 17; three extending ends 32 are arranged, two extending ends 32 are positioned at two sides of the reset stop 12 and are arranged at the lower parts of the zero line elastic sheet 15 and the live line elastic sheet 16, and the zero line elastic sheet 15 and the live line elastic sheet 16 can automatically move downwards under the action of self elasticity; the third protruding end 32 is located at the bottom of the reset stopper 12, as shown in fig. 10, and is disposed at the top of the ground spring 17 for controlling the ground spring 17 to move downward, the ground spring 17 can move upward automatically under the action of its own elastic force, and the electrical connection ends 8 and the spring 9 are both provided with corresponding electrical connection contacts 19 for ensuring the stability and reliability of electrical connection.

As shown in fig. 10, the extending end 32 at the bottom of the reset stopper 12 and the ground wire spring 17 are provided with a through hole for the key rod 27 of the reset button 10 to pass through, specifically, the ground wire spring 17 is provided with a corresponding ground wire spring through hole 29, one end of the first reset spring 21 is abutted against the base 2, the other end of the first reset spring 21 is abutted against the bottom of the reset button 10, and the first reset spring 21 is positioned or limited by a corresponding guide sleeve or guide post and other structures.

Example 3:

in this embodiment, compared with the designs of embodiment 1 and embodiment 2, as shown in fig. 13, in this embodiment, on the basis of embodiment 1, a second return spring 30 is sleeved on the upper portion of the return key 10; in the present embodiment, as shown in fig. 12, a second return spring 30 is sleeved on the upper portion of the reset key 10, specifically, one end of the second return spring 30 abuts against the upper portion of the upper cover plate 3, and the other end of the second return spring 30 abuts against the reset key 10; specifically, in the present embodiment, after the electromagnetic driving device 14 is changed from the normal power-on maintaining state to the power-off state, the reset key 10 moves upward under the combined action of the first return spring 21 and the second return spring 30, and in the upward movement process of the reset key 10, the locking piece 22 slides out along the lower trip inclined plane 1 of the reset key 10 and is separated from the locking state with the reset key 10 due to the loss of the pulling force applied thereto by the driving iron core 23; therefore, by adopting the technical scheme of the embodiment, on one hand, the reset elastic force acting on the reset key 10 can be improved, the reset key 10 can be ensured to move in place under the condition that the reset key needs to be reset, and meanwhile, the elastic force requirement on a single spring can be reduced while the requirement on the elastic force of the spring is met through the first reset spring 21 and the second reset spring 30.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (13)

1. A maintenance-type earth-leakage protector, characterized in that it comprises: the leakage protection device comprises a base (2), an upper cover plate (3) and a leakage protection device (4), wherein the leakage protection device (4) comprises a reset key (10), a reset stop block (12), an electromagnetic driving device (14) and an elastic sheet (9); the base (2) is also provided with an electric connection end (8) which can be electrically connected with the elastic sheet (9);

the reset stop block (12) is movably arranged at the upper part of the base (2) up and down, and an extension end (32) which can be abutted against the elastic sheet (9) is arranged on the reset stop block (12); the electromagnetic driving device (14) is arranged on one side of the upper portion of the base (2), the electromagnetic driving device (14) comprises a driving iron core (23) and a clamping piece (24), the driving iron core (23) extends out of the electromagnetic driving device (14), the driving iron core (23) is movably clamped with the clamping piece (24), the electromagnetic driving device (14) can drive the driving iron core (23) to move so as to drive the clamping piece (24) to move, and a clamping groove (26) for the clamping piece (24) to insert is formed in the reset stop block (12);

the bottom of the reset key (10) is provided with a first reset spring (21), the reset key (10) penetrates through the upper cover plate (3) and is inserted into the reset stop block (12), and the reset key (10) can drive the reset stop block (12) to move synchronously through a clamping piece (22); when the reset key (10) is not pressed by external force, the reset key (10) resets and moves upwards under the action of the first reset spring (21) so that the reset stop block (12) drives the elastic sheet (9) to move upwards and is contacted with the power connection end (8) to be powered on;

the electromagnetic driving device (14) in the continuous power-on state can enable the driving iron core (23) to continuously tension the buckle sheet (22), the buckle sheet (22) is enabled to be continuously clamped with the reset key (10), and the reset key (10) can enable the elastic sheet (9) to be in the power-on state in contact with the power connection end (8) through the reset stop block (12).

2. The maintenance-type earth leakage protector according to claim 1, wherein after the electromagnetic driving device (14) loses power, the driving iron core (23) does not tension the fastening piece (22), the fastening piece (22) and the reset key (10) are separated from a fastening state, and the elastic piece (9) is separated from the power connection end (8) under the action of self elasticity to cut off power.

3. A protective earth leakage protector according to claim 1, characterized in that the reset button (10) is provided with a bayonet (20) for snap-fitting with the snap-fit piece (22), and the bayonet (20) is provided with an upper snap-fit surface (11) and a lower trip inclined surface (1).

4. A maintenance-type earth leakage protector according to claim 3, wherein said fastening plate (22) is a bent metal plate, one end of said fastening plate (22) is provided with a U-shaped opening (18), the other end of said fastening plate (22) is provided with a key opening (22), said U-shaped opening (18) is used for fastening with said driving iron core (23), said key opening (22) is used for said reset key (10) to pass through, and one edge of said key opening (22) can be fastened with said fastening opening (20).

5. The maintaining type earth leakage protector according to claim 4, characterized in that after the electromagnetic driving device (14) loses power, the driving iron core (23) does not tension the buckling piece (22), the reset button (10) moves upwards under the action of the first reset spring (21), and during the upward movement of the reset button (10), the buckling piece (22) slides out along the lower tripping inclined plane (1) of the reset button (10) and is out of the buckling state with the reset button (10).

6. A maintenance-type earth leakage protector according to claim 1, characterized in that said electric connection terminal (8) is a pin structure comprising a neutral pin (5), a live pin (6) and a ground pin (7), said elastic pieces (9) comprise a neutral elastic piece (15) and a live elastic piece (16), said neutral pin (5) corresponds to said neutral elastic piece (15), said live pin (6) corresponds to said live elastic piece (16), said ground pin (7) is directly connected to ground; the two extending ends (32) are arranged on the two sides of the reset stop block (12) and are arranged on the lower portions of the zero line elastic sheet (15) and the live line elastic sheet (16), and the zero line elastic sheet (15) and the live line elastic sheet (16) can automatically move downwards under the action of own elasticity.

7. A maintenance-type earth leakage protector according to claim 1, characterized in that the electric connection terminal (8) is of a pin structure including a neutral pin (5), a live pin (6) and a ground pin (7), the resilient pieces (9) include a neutral resilient piece (15), a live resilient piece (16) and a ground resilient piece (17), the neutral pin (5) corresponds to the neutral resilient piece (15), the live pin (6) corresponds to the live resilient piece (16), and the ground pin (7) corresponds to the ground resilient piece (17); three extending ends (32) are arranged, two extending ends (32) are positioned at two sides of the reset stop block (12) and are arranged at the lower parts of the zero line elastic sheet (15) and the live line elastic sheet (16), and the zero line elastic sheet (15) and the live line elastic sheet (16) can automatically move downwards under the action of self elasticity; the third extending end (32) is positioned at the bottom of the reset stop block (12) and is arranged at the top of the ground wire elastic sheet (17) and used for controlling the ground wire elastic sheet (17) to move downwards, and the ground wire elastic sheet (17) can automatically move upwards under the action of self elasticity.

8. The maintenance type earth leakage protector according to claim 1, wherein the earth leakage protector (4) further comprises a pressing guide block (13), the pressing guide block (13) is clamped on one side of the upper part of the base (2), and a pressing end (31) for pressing and fixing the electric connection end (8) on the base (2) is arranged on the pressing guide block (13).

9. A maintenance-type earth-leakage protector according to claim 1, characterized in that the top of the base (2) is provided with a sliding groove (28) for inserting the reset stopper (12) into the base (2) from top to bottom, and the reset stopper (12) can move up and down relative to the sliding groove (28).

10. A protective earth-leakage protector according to claim 1, characterized in that said electric terminals (8) and said elastic pieces (9) are embedded in said base (2).

11. A maintenance-type earth-leakage protector according to claim 6, characterized in that a through hole is provided on the extended end (32) of the bottom of the reset block (12) for the key rod (27) of the reset key (10) to pass through, one end of the first reset spring (21) is abutted against the base (2), and the other end of the first reset spring (21) is abutted against the bottom of the reset key (10).

12. The maintenance-type earth leakage protector according to claim 7, wherein the extending end (32) at the bottom of the reset stopper (12) and the ground spring (17) are provided with through holes for the key rod (27) of the reset key (10) to pass through, one end of the first reset spring (21) abuts against the base (2), and the other end of the first reset spring (21) abuts against the bottom of the reset key (10).

13. A maintenance-type earth leakage protector according to claim 1, characterized in that a second return spring (30) is sleeved on the upper portion of the return button (10), one end of the second return spring (30) is abutted against the upper portion of the upper cover plate (3), and the other end of the second return spring (30) is abutted against the return button (10).

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