Portable leakage protection plug

Abstract

The present application discloses a portable leakage protection plug. The plug comprises a housing, an output wire, and pins. A control circuit board, a trip assembly, a sensor, a terminal block and a switch are arranged inside the housing. The switch is installed on the upper side of the control circuit board and located outside the housing, the control circuit board is located on the upper side in the housing, the trip assembly and the sensor are located on the left side and right side of the middle of the housing, and the pins and the terminal block are located on the left and right sides of the bottom end in the housing. The present application solves the technical problems that an existing leakage protection plug is oversized, and once inserted into a socket, the leakage protection plug may easily occupy two to three slots of a power strip, or even be too large to install.

Description

A portable leakage protection plug Technical Field

[0001] The utility model belongs to the technical field of power supply circuits, and in particular relates to a portable leakage protection plug. Background Art

[0002] With the increasing popularity of household appliances, people are paying more and more attention to the safety of their use. At present, many household appliances are equipped with leakage protection plugs at the input end of the power supply.

[0003] Existing leakage protection plugs use sensors composed of two identically sized circular coils, one for sensing leakage current and the other for detecting incorrect grounding of the output neutral line. These sensors are relatively tall and bulky, and the larger leakage disconnect and leakage sensor structures, combined with the upgraded self-detection function, also increase the size of the PCBA carrying the IC circuitry. This results in an overall bulkiness that easily occupies two to three sockets on a power strip when plugged into a socket. The leakage protection plug can even be too large to install.

[0004] Utility Model Content

[0005] (1) Technical problems to be solved

[0006] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a portable leakage protection plug, which is designed to solve the technical problems that the existing leakage protection plug is too large as a whole, easily occupies two to three slots of the socket after being inserted into the socket, and even cannot be installed because the leakage protection plug is too large.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the utility model provides a portable leakage protection plug, which includes a shell, output wires and pins. A control circuit board, a tripping assembly, a sensor, a terminal block and a switch are arranged inside the shell. The switch is installed on the upper side of the control circuit board and is located outside the shell. The control circuit board is located on the upper side of the shell. The tripping assembly and the sensor are located on the left and right sides of the middle of the shell. The pins and the terminal block are located on the left and right sides of the bottom end of the shell. A static contact and a moving contact are fixedly connected to the control circuit board. The moving contact is an elastic structure. The static contact is connected to the pin through a wire. The moving contact is connected to the terminal block through an induction line and bypasses the sensor. The tripping assembly is used to connect and disconnect the static contact and the moving contact.

[0009] Preferably, the housing comprises an upper cover, a lower cover and a movable cover, and the lower cover and the movable cover are fixedly connected to the upper cover by screws.

[0010] Furthermore, the inductor includes a first coil and a second coil arranged in the same layer inside and outside, and the diameter of the first coil is larger than the diameter of the second coil.

[0011] Furthermore, the tripping assembly includes a fixed frame, a tripping coil, a tripping core and a tripping spring. The tripping core is installed on the fixed frame, the tripping coil is sleeved on the outer surface of the tripping core, the right end of the tripping core passes through the fixed frame and is fixedly connected to the bridge bracket, the tripping spring is sleeved on the outer surface of the tripping core and is located between the bridge bracket and the fixed frame, and the bottom end of the moving contact passes through the bridge bracket.

[0012] Furthermore, the bridge bracket includes a movable block and supporting blocks fixedly connected to the front and rear sides of the movable block. A through slot is provided on the supporting block, the moving contact is located in the through slot, and arcs are provided on both sides of the through slot.

[0013] Furthermore, a protective cover is provided on the outside of the trip assembly, the protective cover is fixedly connected to the control circuit board through a buckle, and an active cavity corresponding to the active block is provided on the right side of the protective cover.

[0014] Furthermore, the pin is fixedly connected to the protective cover through an insulating seat, and the wiring seat is installed on the lower cover with one end located inside the shell.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model reduces the length of the induction line and the cost of the induction line by placing the terminal block close to the bottom of the sensor, and reduces the height of the switch used while meeting the requirements. At the same time, the sensor is changed to two circular coils, one large and one small, and the inner and outer coils are composed of the same layer. The total volume will become smaller without reducing the performance, thereby achieving the effect of overall volume reduction and avoiding the situation where the plug cannot be installed.

[0018] 2. The present invention simplifies the trip assembly as much as possible and uses the simplest, most common, but most effective relay pull-in design. In order to prevent the contacts from sticking due to large current leakage after pull-in, a clamping position with appropriate tightness is added to the bridge bracket. When a large current leakage occurs, the small-volume trip assembly can still trip normally by relying on the elastic structure of the moving contact and the trip spring.

[0019] 3. The trip assembly module, sensor module and control circuit board module inside the housing of the utility model can each be produced separately and checked for qualification before being assembled, which will greatly improve the qualification rate of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the three-dimensional structure of the present utility model.

[0021] FIG2 is a schematic diagram of the explosion structure of the utility model.

[0022] FIG3 is a bottom view of the explosion structure of the present invention.

[0023] FIG4 is a schematic diagram of the internal structure of the housing of the present invention.

[0024] FIG5 is a schematic structural diagram of the trip assembly of the present invention.

[0025] FIG6 is a schematic diagram of the control circuit structure of the utility model,

[0026] FIG7 is a schematic structural diagram of the sensor of the present invention.

[0027] The marks in the accompanying drawings are: 1. Shell; 2. Output wire; 3. Pin; 4. Control circuit board; 5. Trip assembly; 6. Sensor; 7. Terminal block; 8. Switch; 9. Static contact; 10. Moving contact; 11. Wire; 12. Sensing line; 101. Upper cover; 102. Lower cover; 103. Movable cover; 104. Screw; 601. First coil; 602. Second coil; 501. Fixing frame; 502. Trip coil; 503. Trip core; 504. Trip spring; 505. Bridge bracket; 506. Movable block; 507. Support block; 508. Through slot; 13. Protective cover; 14. Buckle; 15. Movable cavity; 16. Insulating seat. DETAILED DESCRIPTION

[0028] This specific embodiment is a portable leakage protection plug, and its structural schematic diagram is shown in Figures 1 to 7. The plug includes a shell 1, an output wire 2 and a pin 3. The ground wire of the output wire 2 is connected to the ground end of the pin 3. The inside of the shell 1 is provided with a control circuit board 4, a trip assembly 5, an inductor 6, a terminal block 7 and a switch 8. The switch 8 is installed on the upper side of the control circuit board 4 and is located outside the shell 1. The control circuit board 4 is located on the upper side of the inside of the shell 1. The trip assembly 5 and the inductor 6 are located on the left and right sides of the middle of the shell 1. The pin 3 and the terminal block 7 are located on the left and right sides of the bottom end of the inside of the shell 1. A static contact 9 and a moving contact 10 are fixedly connected to the control circuit board 4. The moving contact 10 is an elastic structure. The static contact 9 is connected to the pin 3 through a wire 11. The moving contact 10 is connected to the terminal block 7 through an induction line 12 and bypasses the inductor 6. The trip assembly 5 is used to connect and disconnect the static contact 9 and the moving contact 10.

[0029] As shown in Figures 1 and 2: the shell 1 includes an upper cover 101, a lower cover 102 and a movable cover 103. The lower cover 102 and the movable cover 103 are fixedly connected to the upper cover 101 by screws 104. In this way, the movable cover 103 can be opened when setting the wiring, which facilitates the installation of the output wires 2 and the terminal block 7.

[0030] As shown in FIG3 and FIG4 , the inductor 6 includes a first coil 601 and a second coil 602 arranged in the same layer inside and outside. The diameter of the first coil 601 is larger than that of the second coil 602 .

[0031] This way the setting is changed to two circular coils, one large and one small, with the inner and outer coils in the same layer. The total volume will become smaller, but the performance will not be reduced.

[0032] As shown in Figures 3, 4 and 5: the trip assembly 5 includes a fixed frame 501, a trip coil 502, a trip core 503 and a trip spring 504. The trip core 503 is installed on the fixed frame 501, and the trip coil 502 is sleeved on the outer surface of the trip core 503. The right end of the trip core 503 passes through the fixed frame 501 and is fixedly connected to the bridge bracket 505. The trip spring 504 is sleeved on the outer surface of the trip core 503 and is located between the bridge bracket 505 and the fixed frame 501. The bottom end of the moving contact 10 passes through the bridge bracket 505.

[0033] This setting simplifies the tripping structure as much as possible and uses the simplest, most common but most effective relay pickup design.

[0034] As shown in Figures 4 and 5, the bridging bracket 505 includes a movable block 506 and supporting blocks 507 fixedly connected to the front and rear sides of the movable block 506. A through slot 508 is provided on the supporting block 507, and the moving contact 10 is located in the through slot 508. Arcs are provided on both sides of the through slot 508.

[0035] This arrangement adds a moderately tight clamping position to the bridge bracket 505. When a large current leakage occurs, the small-volume trip assembly 5 can still rely on the elastic structure of the movable contact 10 and the trip spring 504 to trip normally, thereby preventing the contacts from sticking due to large current leakage after being attracted.

[0036] As shown in Figures 5 and 6: A protective cover 13 is provided on the outside of the trip assembly 5, and the protective cover 13 is fixedly connected to the control circuit board 4 through a buckle 14. An active cavity 15 corresponding to the active block 506 is provided on the right side of the protective cover 13. In this way, the protective cover 13 is provided to protect and fix the trip assembly 5, making installation more convenient.

[0037] As shown in Figures 2 and 3: the pin 3 is fixedly connected to the protective cover 13 through the insulating seat 16, and the terminal seat 7 is installed on the lower cover 102 and one end is located inside the shell 1. The insulating seat 16 is provided to insulate the contact of the pin 3 to prevent the pin 3 from leaking electricity.

[0038] Working Principle: By placing the terminal block 7 close to the bottom of the sensor 6, the length of the induction line 12 is shortened, reducing the cost of the induction line 12. The height of the switch used is reduced while meeting the requirements. At the same time, the sensor 6 is changed to two circular coils, one large and one small, with the inner and outer coils in the same layer. The total volume is reduced without reducing performance, thus achieving the effect of overall volume reduction. By simplifying the trip assembly 5 as much as possible and using the simplest, most common but most effective relay pull-in design, to prevent contact adhesion due to high current leakage after pull-in, a moderately tight stop is added to the bridge bracket. When a high current leakage occurs, the small-volume trip assembly can still trip normally due to the elastic structure of the movable contact 10 and the trip spring 504. During use, the sensor 6 monitors the current difference of the output wire 2 to detect leakage. When the current difference reaches the set range, the set IC program will control the leakage trip assembly 5 to disconnect the static contact 9 and movable contact 10 on the main circuit, thereby disconnecting the power supply and protecting the power supply safety.

[0039] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A portable leakage protection plug, comprising a housing (1), an output wire (2) and a plug pin (3), characterized in that: The housing (1) is provided with a control circuit board (4), a trip assembly (5), a sensor (6), a terminal block (7) and a switch (8); the switch (8) is mounted on the upper side of the control circuit board (4) and is located outside the housing (1); the control circuit board (4) is located on the upper side of the housing (1); the trip assembly (5) and the sensor (6) are located on the left and right sides of the middle of the housing (1); and the pin (3) and the terminal block (7) are located on the left and right sides of the bottom end of the housing (1); The control circuit board (4) is fixedly connected with a static contact (9) and a moving contact (10); the moving contact (10) is an elastic structure; the static contact (9) is connected to the plug pin (3) via a wire (11); the moving contact (10) is connected to the wiring seat (7) via an induction wire (12) and bypasses an inductor (6); and the trip assembly (5) is used for connecting and disconnecting the static contact (9) and the moving contact (10).

2. A portable leakage protection plug according to claim 1, characterized in that: The housing (1) comprises an upper cover (101), a lower cover (102) and a movable cover (103); the lower cover (102) and the movable cover (103) are both fixedly connected to the upper cover (101) by means of screws (104).

3. A portable leakage protection plug according to claim 2, characterized in that: The inductor (6) comprises a first coil (601) and a second coil (602) which are arranged in the same layer inside and outside, and the diameter of the first coil (601) is greater than the diameter of the second coil (602).

4. A portable leakage protection plug according to claim 3, characterized in that: The trip assembly (5) comprises a fixing frame (501), a trip coil (502), a trip core (503) and a trip spring (504); the trip core (503) is mounted on the fixing frame (501); the trip coil (502) is sleeved on the outer surface of the trip core (503); the right end of the trip core (503) passes through the fixing frame (501) and is fixedly connected to a bridge bracket (505); the trip spring (504) is sleeved on the outer surface of the trip core (503) and is located between the bridge bracket (505) and the fixing frame (501); and the bottom end of the moving contact (10) passes through the bridge bracket (505).

5. A portable leakage protection plug according to claim 4, characterized in that: The bridge bracket (505) comprises a movable block (506) and a support block (507) fixedly connected to the front and rear sides of the movable block (506); a through slot (508) is provided on the support block (507); the movable contact (10) is located in the through slot (508); and circular arcs are provided on both sides of the through slot (508).

6. A portable leakage protection plug according to claim 5, characterized in that: A protective cover (13) is provided on the outside of the release assembly (5); the protective cover (13) is fixedly connected to the control circuit board (4) via a buckle (14); and an active cavity (15) corresponding to the active block (506) is provided on the right side of the protective cover (13).

7. A portable leakage protection plug according to claim 6, characterized in that: The plug pin (3) is fixedly connected to the protective cover (13) via an insulating seat (16); the wiring seat (7) is mounted on the lower cover (102) and one end of the wiring seat is located inside the housing (1).

Images