A leakage protection plug

Abstract

The present invention discloses a leakage protection plug, the technical solution of which includes a plug housing, a plug for connecting an external power source and a power line for connecting a load, a leakage protection device for realizing power connection between the plug and the power line is arranged in the plug housing, the leakage protection device includes a tripping mechanism, a control circuit board and a reset mechanism, and the plug housing includes a base, a bushing and an upper cover; a main mounting position is arranged on the base, and the tripping mechanism is arranged in the main mounting position; the bushing is snap-fitted on the base to cover the tripping mechanism, a snap-fitting mounting position is arranged on the bushing, and the control circuit board is snap-fitted on the snap-fitting mounting position on the bushing to be separated from the tripping mechanism; the upper cover is snap-fitted on the base and presses the bushing. By applying the above technical solution, the present invention has the characteristics of high assembly convenience.

Description

Technical Field

[0001] The invention relates to the technical field of plugs, and in particular to a leakage protection plug. Background Art

[0002] With the increasing popularity of household appliances, the use safety of household appliances has received increasing attention. At present, the power plugs that people often use are simple in structure and have single functions.

[0003] The power plug that people often use includes a housing and two or three plugs installed on the housing. One end of the plug is exposed outside the housing, and the other end is connected to the input terminals of the power live wire, neutral wire, and ground wire on the control circuit board in the household appliance through a wire. When using the household appliance, you only need to insert the plug of the plug into the power socket. The function of this power plug is only to introduce the power in the power socket into the household circuit board to make it work with power, but it has no protection against the damage caused to the household appliance by the leakage fault of the live wire, neutral wire, and ground wire on the output side of the power plug, and the safety protection performance is poor.

[0004] The Chinese patent with the announcement number CN20363692U discloses a leakage protection plug, including a plug body and a leakage protection device, wherein one end of the plug body is connected to the load, and the bottom of the other end is provided with two plugs connected to the external power supply, and the leakage protection device includes a mutual inductor built in the plug body for sensing whether the current on the live wire and the neutral wire of the power supply are equal, a tripping mechanism connected to the mutual inductor, and a PCB control board that controls the tripping mechanism to disconnect the circuit connection between the power supply and the load when the current difference between the live wire and the neutral wire of the power supply line exceeds a predetermined value according to the induction signal of the mutual inductor, and a reset mechanism that controls the tripping mechanism to reset the connection between the power supply and the load is provided on the plug body, and the mutual inductor and the tripping mechanism are both electrically connected to the PCB control board. The above leakage protection plug is applied to the circuit between the power supply and the load under normal working conditions, but when the mutual inductor senses that the current difference between the live wire and the neutral wire of the power supply end exceeds a predetermined value, the circuit connection between the power supply and the load is disconnected, so as to achieve the role of leakage safety protection.

[0005] Although the above-mentioned power plug can achieve the purpose of leakage protection, the plug body of the above-mentioned power plug is mainly composed of an upper cover and a lower cover, which are assembled together by screws, and the plastic cover of the plug body used to cover the tripping mechanism is also assembled by screws. As a result, in actual production, the assembly convenience of the leakage protection plug is relatively low. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a leakage protection plug which has the characteristic of high assembly convenience.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A leakage protection plug, comprising a plug housing, on which a plug piece for connecting an external power source and a power line for connecting a load are arranged, and a leakage protection device for realizing power connection between the plug piece and the power line is arranged in the plug housing, wherein the leakage protection device comprises a tripping mechanism, a control circuit board and a reset mechanism, and the plug housing comprises a base, a bushing and an upper cover;

[0009] A main installation position is provided on the base, and the tripping mechanism is provided in the main installation position;

[0010] The bushing is clamped and installed on the base to cover the tripping mechanism, a clamping installation position is provided on the bushing, and the control circuit board is clamped on the clamping installation position on the bushing to be separated from the tripping mechanism;

[0011] The upper cover is snap-fitted and mounted on the base to press the bushing tightly.

[0012] Through the above technical solution, the tripping mechanism is installed on the main mounting position of the base, the bushing is clamped on the base and covers the tripping mechanism, the control circuit board is clamped on the clamping mounting position of the bushing, the upper cover is clamped on the base and presses the bushing. In this application, the plug shell adopts a layer-by-layer clamping and layer-by-layer pressing method, abandoning the traditional screw installation method, improving the convenience of assembly, and avoiding the risk of metal conductivity caused by the use of screws.

[0013] Preferably, the base is provided with a secondary mounting position on one side of the main mounting position, and the leakage protection device also includes a mutual inductor, which is arranged in the secondary mounting position. After the control circuit board is confined in the clip-on mounting position of the bushing, the control circuit board confines the mutual inductor in the secondary mounting position.

[0014] Through the above technical solution, the mutual inductor is installed in the auxiliary installation position. After the control circuit board is clamped and installed in the clamping installation position of the bushing, the control circuit board can limit the mutual inductor in the auxiliary installation position.

[0015] Preferably, a static contact is provided on one end of the insert extending into the base;

[0016] The tripping mechanism comprises a tripper, a clip, an actuator and a pair of movable contact pieces;

[0017] The movable contact piece is slidably arranged on both sides of the main installation position, and the movable contact piece is provided with a movable contact point that contacts with the static contact point of the plug piece;

[0018] The release device comprises a hollow coil frame, a coil wound outside the coil frame, and a release iron core inserted in the coil frame, a release spring connected to the release iron core is installed in the coil frame, and one end of the coil frame is electrically connected to the control circuit board;

[0019] A first notch is formed at one end of the buckle plate, and a second notch is formed at the other end of the buckle plate to connect with the tripping core;

[0020] Lifting arms are provided on both sides of the actuator, and the lifting arms are located below the movable contact piece. One end of the buckle piece is inserted into the actuator, and the reset mechanism extends into the actuator to form a snap fit with the first notch of the buckle piece.

[0021] The reset mechanism is used to hook the actuator to move upward, so that the lifting arm drives the moving contact piece to move upward to keep the moving contact and the static contact in contact;

[0022] The release is used to drive the locking piece to disengage from the reset mechanism, so that the actuator moves downward, and the moving contact of the moving contact piece is disengaged from the static contact of the plug piece.

[0023] Through the above technical solution, the reset mechanism can hook the actuator to move upward, and the lifting arm drives the moving contact piece to move upward to realize the contact between the moving contact and the static contact. At this time, the circuit between the load and the power supply is connected; when the load leaks, the releaser will drive the buckle piece to disengage from the reset mechanism, the actuator moves downward, the moving contact is disengaged from the static contact, and the circuit between the load and the power supply is disconnected. The above-mentioned tripping mechanism can well realize the connection or disconnection of the circuit between the load and the power supply, and has good stability.

[0024] Preferably, the reset mechanism includes a reset button and a reset rod located below the reset button, the lower end of the reset rod is provided with a hook that forms a snap fit with the first notch of the buckle plate, and a reset spring is sleeved on the reset rod, one end of the reset spring abuts against the bushing, and the other end of the reset spring abuts against the reset button.

[0025] Through the above technical solution, when the reset button is pressed, the reset rod moves downward, and the hook at the lower end of the reset rod will form a snap fit with the first notch of the buckle plate, and then when the reset button is released, the reset spring will drive the reset rod to move upward, and then the reset rod drives the actuator to move upward through the buckle plate, and the lifting arm drives the moving contact piece to move upward to realize the contact between the moving contact and the static contact, thereby connecting the circuit between the load and the power supply.

[0026] Preferably, a contact spring is installed between the moving contact piece and the bushing.

[0027] Through the above technical solution, when the actuator moves downward, the lifting arm does not apply force to the moving contact piece, and the contact spring improves the separation effect of the moving contact point and the static contact point on the moving contact piece.

[0028] Preferably, slide grooves for the lifting arms of the actuator to slide up and down are arranged on both sides of the main installation position, plug-in blocks are arranged at the notches on both sides of the slide grooves, and the bushing is provided with plug-in grooves for the plug-in blocks to be plugged in.

[0029] Through the above technical solution, the lifting arm slides in the slide groove, and the bushing blocks the opening of the slide groove, thereby improving the sliding stability of the lifting arm in the slide groove.

[0030] Preferably, the base is provided with slide seats on both sides of the main mounting position, the slide seats are provided with sliding grooves, the moving contact piece is provided with a sliding end that slidably cooperates with the sliding groove, and the bushing is provided with a blocking block for blocking the sliding groove.

[0031] Through the above technical solution, the moving contact piece is installed on both sides of the main installation position by sliding up and down. The moving contact piece using this installation method abandons the traditional hinging method of the moving contact piece. The present application can increase the thickness of the moving contact piece, thereby improving the power load capacity of the moving contact piece.

[0032] Preferably, an isolation zone is formed between the two sides of the bushing and the main mounting position, and the movable contact piece is located in the isolation zone;

[0033] The insert is integrally injection-molded on the base, and the static contact of the insert is in contact with the moving contact of the moving contact in the isolation area.

[0034] Through the above technical solution, the plug is integrally injection molded on the base, thereby improving the waterproof performance between the plug and the base, and by setting the isolation area of ​​the bushing, the arc generated when the moving contact and the static contact contact is prevented from being transmitted to the control circuit board.

[0035] Preferably, embedding grooves are further provided on both sides of the main installation position, and an embedding piece is provided on the bushing. When the embedding piece is embedded in the embedding groove, the embedding piece is covered outside the inserting piece.

[0036] Through the above technical solution, the embedded sheet is covered on the plug-in sheet, thereby further improving the blocking effect of the arc generated when the moving contact and the static contact are in contact and transmitted to the control circuit board.

[0037] Preferably, one end of the base is set as an outlet, and the outlet is provided with an outlet for the power line to pass through, and a card is slidably installed on both sides of the outlet inside the base, and the card slides closely against the inner wall of the outlet;

[0038] The inner wall of the upper cover is provided with limiting ribs which abut against the end of the clamping plate to force the clamping plate to be clamped on the power line.

[0039] Through the above technical solution, the present application ensures the tightness between the power cord and the lead-out port by setting the lead-out port on the wire outlet end of the base, thereby improving the waterproof effect of the lead-out port on the power cord, and the card plate clamps the power cord. On the one hand, the card plate serves the purpose of fixing the power cord, and on the other hand, the card plate can close the lead-out port to further improve the waterproof sealing effect.

[0040] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0041] 1. The plug housing in this application adopts a layer-by-layer clamping and layer-by-layer pressing method, abandoning the traditional screw installation method, improving the convenience of assembly, and avoiding the risk of metal conduction caused by the use of screws;

[0042] 2. The present application ensures the tightness between the power cord and the lead-out port by setting the lead-out port on the wire outlet end of the base, thereby improving the waterproof effect of the lead-out port on the power cord, and the card plate clamps the power cord. On the one hand, the card plate serves the purpose of fixing the power cord, and on the other hand, the card plate can close the lead-out port to further improve the waterproof sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the leakage protection plug in the technical solution of the present invention;

[0044] Figure 2 This is a schematic diagram of the installation of the upper cover in the technical solution of the present invention;

[0045] Figure 3 It is a schematic diagram of the installation of the leakage protection device in the technical solution of the present invention;

[0046] Figure 4 It is a schematic diagram of the installation of the tripping mechanism in the technical solution of the present invention;

[0047] Figure 5 It is an exploded schematic diagram of the tripping mechanism in the technical solution of the present invention;

[0048] Figure 6 This is a schematic diagram of the installation of the power cord in the technical solution of the present invention;

[0049] Figure 7 It is a structural schematic diagram of the upper cover in the technical solution of the present invention;

[0050] Figure 8 It is a circuit diagram of the leakage protection circuit in the technical solution of the present invention.

[0051] Reference numerals: 1, plug housing; 101, base; 102, bushing; 103, upper cover; 2, plug; 201, static contact; 3, power cord; 301, power cord tube; 302, power cord terminal; 303, insertion end; 304, annular slot; 4, leakage protection device; 41, tripping mechanism; 411, tripping device; 4111, coil skeleton; 4112, tripping iron core; 4113, Release spring; 4114, annular groove; 412, buckle plate; 413, actuator; 414, moving contact plate; 4141, moving contact point; 4142, sliding end; 415, first notch; 416, second notch; 417, lifting arm; 418, central through hole; 419, contact spring; 42, mutual inductor; 43, control circuit board; 44, reset mechanism; 441, reset button; 442, reset rod; 443, hook; 444, reset spring; 45, test switch; 451, simulation experiment switch; 5, main installation position; 6, card foot; 7, card edge; 8, card installation position; 9, auxiliary installation position; 10, buckle; 11, card block; 12, pressing block; 13, slide groove; 14, plug-in block; 15, plug-in groove; 16, metal pin; 17, slide seat; 18, slide groove; 19, blocking block; 20, insert Mounting groove; 21. Sealing edge; 22. Bracket; 23. Waterproof cap; 24. Mounting seat; 25. Outlet terminal; 26. Lead-out port; 27. Groove; 28. Sealing ring; 29. ​​Clamping plate; 291. Clamping port; 292. Bending end; 30. Guide block; 31. Guide groove; 32. Limiting rib; 33. Bevel; 34. Tensile rib; 35. Embedded groove; 36. Convex edge; 37. Sealing groove; 38. Sealing convex edge. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps described in these embodiments does not limit the scope of the present invention.

[0053] The following description of at least one exemplary embodiment is merely illustrative and is not intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the authorization specification.

[0054] Reference Figure 1As shown, a leakage protection plug includes a plug housing 1, on which are arranged plugs 2 for connecting an external power supply and a power cord 3 for connecting a load. The number of plugs 2 is set to two or three according to the type of the plug. When the number of plugs 2 is two, the plugs 2 are respectively a live power plug 2 and a neutral power plug 2. When the number of plugs 2 is three, the plugs 2 are respectively a live power plug 2, a neutral power plug 2 and a grounding plug 2.

[0055] The power cord 3 extends into the plug housing 1 and is connected to the plug blade 2, thereby realizing the connection between the plug and the load (household appliance). Similarly, those skilled in the art should know that the power cord 3 is provided with a live power line and a neutral power line, or the power cord 3 is provided with a live power line, a neutral power line and a ground line, which will be adapted according to the type of the plug and the load, and this embodiment will not be specifically limited or elaborated.

[0056] Combination Figure 1 and Figure 2 As shown, a leakage protection device 4 for realizing the power connection between the plug 2 and the power line 3 is arranged in the plug housing 1, and the leakage protection device 4 includes a tripping mechanism 41, a mutual inductor 42, a control circuit board 43, a reset mechanism 44 and a test mechanism. The mutual inductor 42 is a ring-shaped plastic shell. The live wire and the neutral wire of the power line 3 pass through the mutual inductor 42 and are respectively welded on the moving contact piece 414 in the tripping mechanism 41. The mutual inductor 42 is wound with a coil winding, and the coil winding is connected to the control circuit board 43. The mutual inductor 42 is used to sense whether the current on the live wire and the neutral wire of the power are equal. Under normal working conditions, the current flowing through the live wire and the neutral wire of the power are equal. When there is a leakage fault in the live wire or the neutral wire of the power, there is a current difference between the live wire and the neutral wire of the power. The mutual inductor 42 sends the leakage current signal between the live wire and the neutral wire of the power to the control circuit board 43.

[0057] The control circuit board 43 is provided with a leakage protection circuit. When receiving the leakage current signal sent by the transformer 42, the control circuit board 43 controls the tripping mechanism 41 to disconnect the circuit connection between the power supply and the load. When the power supply and the load are disconnected, the reset mechanism 44 controls the tripping mechanism 41 to reset the connection between the power supply and the load.

[0058] Combination Figure 3 and Figure 4As shown, in the present application, the plug housing 1 includes a base 101, a bushing 102 and an upper cover 103, and the plug 2 is arranged on the base 101, one end of the plug 2 is exposed outside the base 101, and the other end of the plug 2 extends into the base 101. If the number of plugs 2 is set to three, the ends of the live wire plug 2 and the neutral wire plug 2 extending into the base 101 are riveted with a static contact 201. One end of the ground wire plug 2 is exposed outside the base 101, and the other end passes through the base 101 and is fixed to the base 101 by riveting with a ground wire.

[0059] A main mounting position 5 is provided on the base 101, and the main mounting position 5 is surrounded by two mounting plates arranged at intervals. The tripping mechanism 41 is provided in the main mounting position 5. The base 101 is provided with clamping feet 6 on both sides of the main mounting position 5, and the side edges of the bushing 102 are provided with clamping edges 7 for clamping with the clamping feet 6. The bushing 102 is clamped and installed on the base 101 to be located above the main mounting position 5 and cover the tripping mechanism 41.

[0060] The bushing 102 is provided with a clamping installation position 8, and the control circuit board 43 is clamped on the clamping installation position 8 on the bushing 102 to be separated from the tripping mechanism 41. Among them, the base 101 is provided with a secondary installation position 9 on one side of the main installation position 5, and the mutual inductor 42 is arranged in the secondary installation position 9. After the control circuit board 43 is confined in the clamping installation position 8 of the bushing 102, the control circuit board 43 confines the mutual inductor 42 in the secondary installation position 9.

[0061] A plurality of buckles 10 are arranged on the four edges of the base 101. Figure 7 As shown, a clamping block 11 for cooperating with the buckle 10 is provided on the inner wall of the upper cover 103, and the upper cover 103 is clamped and installed on the base 101, wherein a plurality of clamping blocks 12 are provided on the inner wall of the upper cover 103, and when the upper cover 103 is clamped and installed on the base 101, the clamping blocks 12 abut against the edge of the bushing 102 to press the bushing 102 on the main mounting position 5.

[0062] In the present application, the release mechanism 41 is arranged between the base 101 and the bushing 102, the control circuit board 43 is arranged on the bushing 102, the upper cover 103 presses the bushing 102, and the reset mechanism 44 is between the control circuit board 43 and the upper cover 103. The plug housing 1 adopts a layer-by-layer clamping and layer-by-layer pressing method, abandons the traditional screw installation method, and improves the assembly convenience.

[0063] Specifically, the reset mechanism 44 includes a reset button 441 and a reset rod 442 located below the reset button 441. The reset button 441 is set on the upper cover 103. The reset rod 442 passes through the control circuit board 43 and the bushing 102 and extends into the main installation position 5. The lower end of the reset rod 442 is provided with a hook 443 connected to the buckle 10 of the tripping mechanism 41. A reset spring 444 is sleeved on the reset rod 442. One end of the reset spring 444 abuts against the bushing 102, and the other end of the reset spring 444 abuts against the reset button 441.

[0064] Combination Figure 4 and Figure 5 As shown, the tripping mechanism 41 includes a tripper 411, a locking piece 412, an actuator 413 and a pair of movable contact pieces 414. The tripper 411 is embedded and fixed in the main mounting position 5, and the tripper 411 includes a hollow coil frame 4111, a coil wound outside the coil frame 4111, and a tripping iron core 4112 inserted in the coil frame 4111. A tripping spring 4113 connected to the tripping iron core 4112 is installed in the coil frame 4111, and one end of the coil frame 4111 is electrically connected to the control circuit board 43. The buckle plate 412 is arranged in an L-shape as a whole, and a first slot 415 is provided at one end of the buckle plate 412, and a second slot 416 is provided at the other end of the buckle plate 412 to connect with the release iron core 4112, and the second slot 416 is communicated with the end of the other end of the buckle plate 412, and the end of the release iron core 4112 is provided with an annular groove 4114 which is embedded with the second slot 416.

[0065] The actuator 413 is arranged in the main mounting position 5 and can move up and down in the main mounting position 5. Lifting arms 417 are provided on the left and right sides of the actuator 413. Slide grooves 13 for the lifting arms 417 of the actuator 413 to slide up and down are provided on both sides of the main mounting position 5. The main mounting position 5 is provided with plug-in blocks 14 at the notches on both sides of the slide groove 13. The bushing 102 is provided with a plug-in groove 15 for the plug-in block 14 to be plugged in. Therefore, when the bushing 102 is snap-fitted and installed on the base 101, the plug-in block 14 is plugged into the plug-in groove 15, and then the bushing 102 can block the notch of the slide groove 13 to ensure the stability of the actuator 413 sliding up and down in the main mounting position 5.

[0066] Among them, a side hole is opened on the actuator 413, and one end of the buckle plate 412 with a first slot 415 is inserted into the actuator 413 from the side hole. The top of the actuator 413 is provided with a central through hole 418 running longitudinally through it. The reset rod 442 of the reset mechanism 44 can extend into the actuator 413 from the central through hole 418, and the hook 443 of the reset rod 442 forms a snap fit with the first slot 415 of the buckle plate 412.

[0067] The moving contact piece 414 is slidably arranged on both sides of the main mounting position 5, and is provided with a moving contact 4141 that contacts the static contact 201 of the plug 2. The bushing 102 is provided with a metal pin 16. The moving contact piece 414 is welded to the metal pin 16 through a wire, and the live wire and the neutral wire of the power cord 3 are welded to the metal pin 16.

[0068] It is worth noting that the movable contact piece 414 is slidably installed in such a manner that the base 101 is provided with a slide seat 17 on both sides of the main installation position 5, and a slide groove 18 is provided on the slide seat 17 in the vertical direction, and the slide groove 18 is connected with the top of the slide seat 17, and a sliding end 4142 is provided on the movable contact piece 414 to slide with the slide groove 18, and a blocking block 19 for blocking the slide groove 18 is provided on the bushing 102. In the present application, the movable contact piece 414 is separated from the static contact 201 of the insert 2 by sliding up and down as a whole, avoiding the separation of the movable contact 4141 from the static contact 201 by relying on the elasticity of the movable contact piece 414 itself. In this way, the present application increases the overall thickness of the movable contact piece 414 to effectively improve the load capacity of the movable contact piece 414 for large current. In one embodiment, the thickness of the movable contact piece 414 is 0.8 mm.

[0069] In order to increase the separation force between the moving contact 4141 on the moving contact piece 414 and the static contact 201 of the insert piece 2, a contact spring 419 is installed between the moving contact piece 414 and the bushing 102, one end of the contact spring 419 is connected to the moving contact piece 414, and the other end of the contact spring 419 is connected to the bushing 102.

[0070] It is worth noting that, in order to improve the isolation effect of the bushing 102 on the control circuit board 43 and the tripping mechanism 41, an isolation zone is formed between the two sides of the bushing 102 and the main mounting position 5, the moving contact piece 414 is located in the isolation zone, the plug piece 2 extends from the base 101 and is located in the isolation zone, and the moving contact point 4141 of the moving contact piece 414 and the static contact point 201 of the plug piece 2 contact and separate in the isolation zone.

[0071] Embedding grooves 20 are also provided on both sides of the main mounting position 5, and embedding pieces for engaging with the embedding grooves 20 are provided on the bushing 102. When the embedding pieces are embedded in the embedding grooves 20, the embedding pieces are covered on the outside of the inserting piece 2. Therefore, the embedding pieces not only improve the stability of the bushing 102 installed on the base 101, but also can further improve the isolation effect of the bushing 102.

[0072] Combination Figure 3 and Figure 8As shown, the test mechanism includes a test button and a simulation experiment switch 451. The test button is arranged on the upper cover 103, and the simulation experiment switch 451 is arranged on the control circuit board 43. A simulation coil winding is also wound on the mutual inductor 42. One end of the simulation experiment switch 451 is connected to the neutral line of the power supply, and the other end of the simulation experiment switch 451 is connected to one end of the simulation coil winding, and the other end of the simulation coil winding is connected to the live line of the power supply.

[0073] A bracket 22 is also provided above the control circuit board 43, and a plurality of positioning holes are provided on the bracket 22. Positioning columns matching the positioning holes are provided on the inner wall of the upper cover 103, and a waterproof cap 23 is also provided on the bracket 22. The waterproof cap 23 covers the reset button 441 and the test button, and is pressed and fixed on the upper cover 103 by the bracket 22 to achieve a waterproof effect, wherein the test button is hidden in the waterproof cap 23 and is integrated with the waterproof cap 23.

[0074] Figure 8 For the circuit diagram of the leakage protection circuit of this application, refer to Figure 8 As shown, the leakage protection circuit includes an amplifier circuit, a rectifier circuit, a resistor R1 and a thyristor SCR. The amplifier circuit has a power supply end, an input end and an output end. The coil winding of the mutual inductor 42 is coupled to the input end of the amplifier circuit, the output end of the amplifier circuit is coupled to the control electrode of the thyristor SCR, one end of the coil of the release 411 is coupled to the live wire of the power supply, and the other end of the coil of the release 411 is coupled to the rectifier circuit. The power supply end of the amplifier circuit is coupled to the rectifier circuit through the resistor R1, and the thyristor SCR is respectively coupled to the rectifier circuit and the neutral wire of the power supply to form a conduction loop.

[0075] The working principle of the leakage protection plug is explained below in combination with the leakage protection circuit:

[0076] Under normal working conditions, when the reset button 441 is pressed, the reset rod 442 extends into the actuator 413, and under the action of the trip spring 4113, the first notch 415 of the clip 412 is stuck on the hook 443 of the reset rod 442. At this time, the reset button 441 is released, and under the action of the reset spring 444, the reset rod 442 moves upward, and drives the actuator 413 to move upward through the clip 412, so that the lifting arm 417 drives the moving contact piece 414 to move upward, thereby keeping the moving contact 4141 in contact with the static contact 201 to connect the power connection between the load and the power supply.

[0077] When leakage occurs due to aging or damage of the live wire or the neutral wire of the power supply, or when the core wire is exposed, there is a current difference between the live wire and the neutral wire of the power supply. The mutual inductor 42 will sense the current difference between the live wire and the neutral wire of the power supply, and then generate a leakage current signal and send it to the control circuit board 43. The amplifying circuit of the control circuit board 43 receives the leakage current signal, generates a signal and triggers the thyristor SCR to turn on, and controls the coil of the release 411 to be energized, thereby generating a magnetic field sufficient to drive the release core 4112. The release core 4112 is extended and retracted to cause the buckle 412 placed horizontally in the actuator 413 to move, and the first notch 415 of the buckle 412 is disengaged from the hook 443 of the reset rod 442, so that the actuator 413 moves downward. Under the action of the contact spring, the moving contact 4141 of the moving contact 414 is disengaged from the static contact 201 of the plug 2, thereby disconnecting the power connection between the load and the power supply.

[0078] When you want to test the leakage protection plug, you only need to press the test button. The test button closes the simulation experiment switch 451 and introduces a test current into the mutual inductor 42, so that the mutual inductor 42 generates a leakage current signal to the control circuit board 43. The amplifying circuit of the control circuit board 43 receives the leakage current signal, generates a signal and triggers the thyristor SCR to turn on, and controls the coil of the releaser 411 to be energized, generating a magnetic field sufficient to drive the tripping core 4112. The tripping core 4112 expands and contracts to cause the buckle 412 placed horizontally in the actuator 413 to move, and the first notch 415 of the buckle 412 is disengaged from the hook 443 of the reset rod 442, so that the actuator 413 moves downward, and the moving contact 4141 of the moving contact 414 is disengaged from the static contact 201 of the plug 2 under the action of the contact spring, thereby disconnecting the power connection between the load and the power supply.

[0079] In order to display the working state of the leakage protection plug, the leakage protection circuit also includes a light emitting diode LED, which is connected in series between the rectifier circuit and the thyristor SCR, and an indicator light hole for displaying the state of the light emitting diode LED is arranged on the surface of the upper cover 103. When the thyristor SCR is turned on, the light emitting diode LED will give an indication to indicate that there is leakage in the load, the live wire of the power supply or the neutral wire of the power supply.

[0080] The following is an explanation of the waterproof settings of this application:

[0081] Reference Figure 4As shown, the plug 2 is integrally injection molded on the base 101, so that the plug 2 is embedded and fixed on the base 101. Among them, the live wire plug 2 and the neutral wire plug 2 of the plug 2 are arranged in an L shape. Therefore, when the plug 2 is integrally injection molded on the base 101, an L-shaped bent mounting seat 24 for mounting the plug 2 is formed on the base 101. The bent structural design of the mounting seat 24 improves the waterproof performance between the plug 2 and the base 101.

[0082] Combination Figure 5 and Figure 6 As shown, one end of the base 101 is set as an outlet 25, and the outlet 25 is provided with an outlet 26 for the power cord 3 to pass through, and the outlet 26 is circular to match the power cord 3. The power cord 3 includes a power cord tube 301 and a power cord terminal 302 fixed on the power cord tube 301. In one embodiment, the power cord terminal 302 is molded and fixed on the power cord tube 301. The live wire and the neutral wire of the power supply are passed through the power cord tube 301, and the power cord terminal 302 is provided with an insertion end 303, which is cylindrical as a whole, and is plugged with the outlet 26. The power cord terminal 302 is tightly pressed against the outlet 25 of the base 101, and the end face of the power cord terminal 302 is kept in contact with the outer wall of the outlet 25 of the base 101, and the end face of the power cord terminal 302 covers the outlet 26.

[0083] It is worth noting that a groove 27 is provided on the outer wall of the outlet 25 around the outlet 26 , a sealing ring 28 is provided in the groove 27 , and the sealing ring 28 is pressed tightly by the power line terminal 302 .

[0084] A card plate 29 is slidably installed on both sides of the lead-out port 26 inside the base 101, and the card plate 29 slides close to the inner wall of the lead-out terminal 25. The sliding installation method of the card plate 29 is that the base 101 is provided with a guide block 30 on both sides of the lead-out port 26, and a guide groove 31 is formed between the guide block 30 and the inner wall of the lead-out terminal 25, and the card plate 29 can be slidably installed in the guide groove 31.

[0085] The two clamping plates 29 move toward one side of the power cord 3 at the same time, and the two clamping plates 29 clamp the insertion end 303 of the power cord terminal 302. Specifically, an annular clamping groove 304 is provided on the outer wall of the insertion end 303, and a clamping opening 291 matching the annular clamping groove 304 is provided on the clamping plate 29. The clamping opening 291 of each clamping plate 29 is semicircular, and the curvature of the clamping opening 291 is the same as that of the annular clamping groove 304. After the two clamping plates 29 are spliced, the diameter of the circular hole formed by the two clamping openings 291 is the same as the inner diameter of the annular clamping groove 304.

[0086] Thus, after the card plate 29 is engaged into the annular card groove 304 of the insertion end 303 through the card opening 291, the power cord 3 is installed and fixed on the base 101, and after the two are connected, the card plates 29 can cover the lead-out port 26 to achieve a waterproof sealing effect.

[0087] Reference Figure 7 As shown, the inner wall of the upper cover 103 is provided with the same number of limiting ribs 32 as the card plate 29, and the viewing angle when the upper cover 103 is buckled and clamped on the base 101 is taken as the reference direction, and the limiting ribs 32 are respectively located on both sides of the lead-out port 26, and the limiting ribs 32 are used to abut against the end of the card plate 29 to force the card plate 29 to clamp on the power cord 3. It is worth noting that the limiting ribs 32 are provided with bevels 33, and the bevels 33 are used to abut against the end of the card plate 29 to guide the card plate 29 to slide, and the end of the card plate 29 away from the clamping port 291 is provided with a bent end 292 for abutting against the bevel 33.

[0088] At least one tensile rib 34 is also provided on the inner wall of the upper cover 103. In one embodiment, the number of tensile ribs 34 is three, and a groove 35 is provided on the tensile rib 34. A convex edge 36 engaged with the groove 35 is provided on the outer edge of the base 101. The tensile rib 34 is located at the inner wall of the upper cover 103 opposite to the outlet 25. The groove 35 of the tensile rib 34 is engaged with the convex edge 36, which not only improves the installation strength between the upper cover 103 and the base 101, but also increases the tensile strength of the outlet 26.

[0089] The base 101 is provided with sealing grooves 37 on its four sides, and the upper cover 103 is provided with sealing convex edges 38 on its four sides. When the upper cover 103 is buckled and installed on the base 101, the sealing convex edges 38 are embedded in the sealing grooves 37. The sealing convex edges 38 are also provided with a V-shaped sealing edge 21, which is used to abut against the bottom of the sealing groove 37. A sealing rubber ring is provided in the sealing groove 37, and the sealing edge 21 is used to squeeze the sealing rubber ring and confine it in the sealing groove 37.

[0090] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A leakage protection plug, comprising a plug housing (1), the plug housing (1) being provided with a plug piece (2) for connecting an external power source, and a power line (3) for connecting a load, the plug housing (1) being provided with a leakage protection device (4) for realizing an electrical connection between the plug piece (2) and the power line (3), the leakage protection device (4) comprising a tripping mechanism (41), a control circuit board (43) and a reset mechanism (44), characterized in that: The plug housing (1) comprises a base (101), a bushing (102) and an upper cover (103); A main installation position (5) is provided on the base (101), and the tripping mechanism (41) is provided in the main installation position (5); The bushing (102) is snap-fitted and mounted on the base (101) to cover the tripping mechanism (41); a snap-fitting mounting position (8) is provided on the bushing (102); and the control circuit board (43) is snap-fitted on the snap-fitting mounting position (8) on the bushing (102) to be separated from the tripping mechanism (41); The upper cover (103) is mounted on the base (101) by snapping and pressing the bushing (102); a static contact (201) is provided on one end of the insert (2) extending into the base (101); The tripping mechanism (41) comprises a tripper (411), a locking piece (412), an actuator (413) and a pair of movable contact pieces (414); The movable contact piece (414) is slidably arranged on both sides of the main installation position (5), and the movable contact piece (414) is provided with a movable contact point (4141) that contacts the static contact point (201) of the plug piece (2); The release device (411) comprises a hollow coil frame (4111), a coil wound outside the coil frame (4111), and a release iron core (4112) inserted into the coil frame (4111); a release spring (4113) connected to the release iron core (4112) is installed in the coil frame (4111); one end of the coil frame (4111) is electrically connected to the control circuit board (43); A first notch (415) is provided at one end of the buckle plate (412), and a second notch (416) is provided at the other end of the buckle plate (412) to be connected to the release iron core (4112); Lifting arms (417) are provided on both sides of the actuator (413), and the lifting arms (417) are located below the movable contact piece (414). One end of the buckle piece (412) is inserted into the actuator (413), and the reset mechanism (44) extends into the actuator (413) and forms a snap fit with the first notch (415) of the buckle piece (412); The reset mechanism (44) is used to hook the actuator (413) to move upward, so that the lifting arm (417) drives the moving contact piece (414) to move upward to keep the moving contact point (4141) and the static contact point (201) in contact with each other; The release device (411) is used to drive the buckle piece (412) to disengage from the reset mechanism (44), so that the actuator (413) moves downward, and the moving contact (4141) of the moving contact piece (414) is disengaged from the static contact (201) of the plug piece (2); the reset mechanism (44) comprises a reset button (441) and a reset rod (442) located below the reset button (441); the lower end of the reset rod (442) is provided with a hook (443) that forms a snap fit with the first notch (415) of the buckle piece (412); the reset rod (442) is sleeved with a reset spring (444), and one end of the reset spring (444) is The main mounting position (5) of the base (101) is provided with a secondary mounting position (9), and the leakage protection device (4) further comprises a mutual inductor (42), wherein the mutual inductor (42) is arranged in the secondary mounting position (9). After the control circuit board (43) is confined in the snap-fit ​​mounting position (8) of the bushing (102), the control circuit board (43) confines the mutual inductor (42) in the secondary mounting position (9); a coil winding is wound around the mutual inductor (42), and the coil winding is connected to the control circuit board (43).

2. A leakage protection plug according to claim 1, characterized in that: A contact spring (419) is installed between the movable contact piece (414) and the bushing (102).

3. A leakage protection plug according to claim 1, characterized in that: Slide grooves (13) for the lifting arms (417) of the actuator (413) to slide up and down are arranged on both sides of the main mounting position (5), and plug-in blocks (14) are arranged at notches on both sides of the slide grooves (13), and the bushing (102) is provided with plug-in grooves (15) for the plug-in blocks (14) to be plugged in.

4. A leakage protection plug according to claim 1, characterized in that: The base (101) is provided with a slide seat (17) on both sides of the main installation position (5), the slide seat (17) is provided with a slide groove (18), the movable contact piece (414) is provided with a slide end (4142) that slides with the slide groove (18), and the bushing (102) is provided with a blocking block (19) for blocking the slide groove (18).

5. A leakage protection plug according to claim 1, characterized in that: An isolation zone is formed between the two sides of the bushing (102) and the main mounting position (5), and the movable contact piece (414) is located in the isolation zone; The insert piece (2) is integrally injection-molded on the base (101), and the static contact point (201) of the insert piece (2) is in contact with the moving contact point (4141) of the moving contact piece (414) in the isolation area.

6. A leakage protection plug according to claim 5, characterized in that: The main installation position (5) is also provided with mounting grooves (20) on both sides, and the bushing (102) is provided with an mounting piece. When the mounting piece is mounted in the mounting groove (20), the mounting piece is covered outside the inserting piece (2).

7. A leakage protection plug according to claim 1, characterized in that: One end of the base (101) is provided as an outlet (25), and the outlet (25) is provided with an outlet (26) for the power line (3) to pass through, and inside the base (101) there are respectively slidably mounted a clamping plate (29) on both sides of the outlet (26), and the clamping plate (29) slides closely against the inner wall of the outlet (25); The inner wall of the upper cover (103) is provided with a limiting rib (32) that abuts against the end of the clamping plate (29) to force the clamping plate (29) to clamp onto the power cord (3).

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