CN209896322U

CN209896322U - Leakage protector

Info

Publication number: CN209896322U
Application number: CN201921056248.4U
Authority: CN
Inventors: 李显扬
Original assignee: SHENZHEN LIANMINGXING PLASTIC POWER TECHNOLOGY CO LTD
Current assignee: SHENZHEN LIANMINGXING PLASTIC POWER TECHNOLOGY CO LTD
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2020-01-03
Anticipated expiration: 2029-07-08

Abstract

The utility model provides a leakage protector, includes that epitheca and inferior valve cover each other and close the casing that forms, set up PCB board in the casing, locate detection device and trip gear on the PCB board, through the power cord that detection device and trip gear electricity are connected, participate in with what the trip gear electricity is connected, the pin hole has been seted up to the inferior valve, the front end of participating in stretches out from participating in the hole, the inferior valve medial surface is equipped with the back-off that the rear end was participated in the straining at participating in the hole edge, participates in that the rear end another side extends and the bending type is formed with the kink, the medial surface of inferior valve is provided with the support that supports participating in the kink along participating in the hole edge, the medial surface of epitheca. The design ensures that the lower shell is not stressed and the pins cannot run out when the plug is plugged. Through the fixed participate in of above structure, effectively reduced the stress of inferior valve part, avoided the risk that the inferior valve bursts, improve the product quality from the design, reduce bad production.

Description

Leakage protector

Technical Field

The utility model relates to a earth-leakage protector technical field indicates a earth-leakage protector especially.

Background

Along with the increasing popularization of household appliances, people pay more and more attention to the use safety of the household appliances, and at present, a plurality of household appliances are provided with leakage protectors at the input ends of power supplies. The earth leakage protector is used for detecting residual current in an earth wire loop. The working principle is that two power lines (live wire and neutral wire) of a plug are simultaneously penetrated into a central hole of a specially-made zero sequence current transformer, when the electric appliance is normally used, the currents flowing through the live wire and the neutral wire are completely equal, the currents are input and output at one time, and no voltage is output from a secondary coil of the current transformer. When there is residual current in the ground circuit, the two power lines through the transformer are unbalanced, and the output of the current transformer will generate voltage signal proportional to the current.

The existing leakage protector has the defects in structural design, including: in the market, after the copper pin is inserted into the lower shell, the copper pin is tightly pressed with the lower shell by the copper pin, so that the copper pin cannot shrink inwards or fall off, but the plastic material can increase the stress of the plastic part due to long-time stress, poor injection molding material, temperature generated when the copper pin is loaded and the like, and the lower shell is cracked.

In response to the bad feedback in market, because of producing badly and leading to on the market part earth-leakage protector to lose earth-leakage protection function, the utility model discloses to earth-leakage protector mechanical part improvement, improve the product quality from the design, reduce bad production.

Disclosure of Invention

In order to solve the problem, the utility model provides a leakage protector, through changing the connection structure who participates in with the casing, effectively reduced the stress of inferior valve part, avoided the risk that the inferior valve bursts, improve the product quality from the design, reduce bad production.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a leakage protector, includes that epitheca and inferior valve cover each other and close the casing that forms, set up PCB board in the casing, locate detection device and trip gear on the PCB board, through the power cord that detection device and trip gear electricity are connected, participate in with what the trip gear electricity is connected, the pin hole has been seted up to the inferior valve, the front end of participating in stretches out from participating in the hole, the inferior valve medial surface is equipped with the back-off that the rear end was participated in the straining at participating in the hole edge, participates in that the rear end another side extends and the bending type is formed with the kink, the medial surface of inferior valve is provided with the support that supports participating in the kink along participating in the hole edge, the medial surface of epitheca.

Specifically, the pin bending part is bent from the other side of the rear end of the pin to the back of the tripping device, the tail end of the bending part extends towards one side of the rear end of the pin and is provided with a connecting column, the connecting column and one side of the rear end of the pin form a through hole, the tail end of the connecting column is conical, and the connecting column is inserted on the PCB.

Specifically, trip gear includes reset key, reset spring, flies frame, interlock piece, main shell fragment, battery valve subassembly, the reset key runs through the setting of PCB board and passes through reset spring and PCB board elastic connection, fly the frame and support in the leading flank of inferior valve, be equipped with the catching groove on the aircraft frame, be equipped with the discount on the interlock piece, battery valve subassembly sets up on the PCB board and is connected with the interlock piece, and battery valve subassembly drive interlock piece removes and makes discount and catching groove lock, be equipped with the draw-in groove on the reset key, be equipped with the screens of card draw-in groove on the discount, main shell fragment one end and detection device fixed connection, the main shell fragment other end and aircraft frame elastic contact, when the draw-in groove of card on the reset key is held to the discount on the interlock piece, the main shell fragment other end and the kink electric contact of participating in.

Specifically, the battery valve component comprises a battery valve rubber core, a battery valve spring and a linkage shaft, wherein an electromagnetic coil is sleeved outside the battery valve rubber core, the linkage shaft penetrates through the battery valve rubber core, two ends of the battery valve spring are respectively abutted against the inner wall of the battery valve rubber core and one end of the linkage shaft, and the other end of the linkage shaft is connected with a linkage sheet.

Specifically, the tip of flying the frame is provided with the lug, the main shell fragment other end is provided with the joint the recess of lug.

Specifically, the detection device comprises a mutual inductor, one end of the main elastic sheet extends through the center of the mutual inductor, and the power line is electrically connected with the main elastic sheet.

Specifically, the mutual inductor comprises a shell, an annular metal magnetic core, a low-voltage winding and a high-voltage winding, wherein the annular metal magnetic core is arranged in the center of the shell, the low-voltage winding is wound on the annular metal magnetic core, two metal needles are fixedly arranged on two opposite sides in the shell, the high-voltage winding is wound on the annular metal magnetic core for 1-2 circles, two winding heads of the high-voltage winding are respectively connected with the two metal needles on one side, the two winding heads of the low-voltage winding are respectively connected with the two metal needles on the other side, the shell is integrated with the annular metal magnetic core, the low-voltage winding and the high-voltage winding through epoxy resin in a sealing mode, and the metal needles are electrically connected with a PCB.

Specifically, the shell includes the bottom plate and sets up the leg on the bottom plate, the bottom plate center is provided with hollow post, annular metal magnetic core cover is established on the hollow post, main shell fragment one end is passed through hollow post, be equipped with on the bottom plate and detain the position, be equipped with on the main shell fragment with detain the cramp of position lock joint, the medial surface of inferior valve is provided with the fixed column, the both sides face of fixed column is provided with positioning groove, the one end that main shell fragment extends be provided with positioning groove complex location protruding muscle, when hollow post cup joints on the fixed column, the protruding muscle card in location on the main shell fragment goes into in the positioning groove on the fixed column.

Specifically, the power cord passes through binding post and is connected with main shell fragment, binding post one side is provided with the riveting piece with power cord riveting, binding post another side is provided with the inserted sheet that inserts main shell fragment and hollow post clearance.

Specifically, still be provided with the line ball piece and the line ball seat of cramping the power cord in the casing, set up the wire pressing groove on the wire pressing seat, the joint groove of intercommunication wire pressing groove is seted up to the lateral wall of wire pressing seat, the line ball piece mountable is in the wire pressing groove, the lateral wall of line ball piece is equipped with the fixture block with joint groove joint.

The beneficial effects of the utility model reside in that: after the pins are inserted into the pin holes of the lower shell, the pins are reversely buckled on the lower shell, so that the pins cannot go out upwards when being fixed. And, there is a bending part that supports and presses the participating in the epitheca, guarantee to participate in and can't go out upwards. The base pin is bent to form an L-shaped structure because of the rear end, and when the base pin is hung downwards, the support on the lower shell can effectively support the bent part of the base pin, so that the base pin is prevented from being separated. Under the normal condition, the design has no stress interference condition, ensures that the position of the lower shell is not stressed, and can ensure that the plug pins cannot run out when the plug is pulled out and inserted. Through the fixed participate in of above structure, effectively reduced the stress of inferior valve part, avoided the risk that the inferior valve bursts, improve the product quality from the design, reduce bad production.

Drawings

Fig. 1 is an external view of the present invention;

fig. 2 is an exploded view of the present invention;

fig. 3 is a top view of the present invention;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a schematic view of the inner surface of the upper case of the present invention;

FIG. 6 is a schematic view of the inner surface of the lower case of the present invention;

fig. 7 is a bottom view of the present invention;

fig. 8 is an inner surface elevation view of the lower case of the present invention;

fig. 9 is a cross-sectional view taken along line B-B of fig. 8 in accordance with the present invention;

fig. 10 is a schematic view of the pin structure of the present invention;

FIG. 11 is a schematic structural view of the present invention with the upper case removed;

fig. 12 is a schematic structural view of the present invention with the upper case and the PCB removed;

fig. 13 is a schematic structural view of the trip device and the detection device of the present invention;

fig. 14 is an exploded view of the trip unit of the present invention;

fig. 15 is a schematic structural diagram of the transformer of the present invention;

fig. 16 is a schematic view of the connection structure between the mutual inductor and the main elastic piece of the present invention;

FIG. 17 is a schematic structural view of the wire pressing block and the wire pressing base of the present invention;

fig. 18 is a circuit diagram of a leakage protector.

The reference numbers illustrate:

1-a shell; 2-a PCB board; 3-a detection device; 4-a trip device; 5-a power line; 6-pin;

11-upper shell; 12-a lower shell;

111-pressing strip;

121-pin holes; 122-reversing; 123-support; 124-a chute; 125-fixed column; 1251-positioning groove;

31-a housing; 32-a toroidal metal core; 33-a low voltage winding; 34-a high voltage winding; 35-a metal needle;

311-a backplane; 312-a surrounding wall; 313-hollow column;

3111-fastening;

41-reset key; 42-a return spring; 43-a flying gantry; 44-a trace sheet; 45-main spring sheet; 46-a solenoid valve assembly; 47-test bond; 48-test spring;

411-card slot;

431-catching grooves; 432-a bump;

441-fastening head; 442-clamping;

451-grooves; 452-a cleat; 453-positioning convex ribs;

461-battery valve rubber core; 462-a battery valve spring; 463-linkage axis;

51-a connection terminal; 511-riveting the sheets; 512-inserting pieces;

521-line pressing blocks; 5211-cartridge;

522-wire pressing seat; 5221-pressing groove; 5222-a clip groove;

53-wire sheathing;

61-a bending part; 62-connecting column; 63-clear.

Detailed Description

Referring to fig. 1-2, the present invention relates to an electric leakage protector, which comprises a housing 1 formed by covering an upper housing 11 and a lower housing 12, a PCB 2 disposed in the housing 1, a detecting device 3 and a tripping device 4 disposed on the PCB 2, a power line 5 electrically connected to the tripping device 4 via the detecting device 3, referring to fig. 3-10, the lower case 12 is provided with pin holes 121, the front end of the pin 6 extends out of the pin hole 121, the inner side of the lower shell 12 is provided with a reverse buckle 122 at the edge of the pin hole 121, the reverse buckle fastens one side of the rear end of the pin 6, the other side of the rear end of the pin 6 extends and is bent to form a bending part 61, the inner side of the lower case 12 is provided with seats 123 along the edges of the pin holes 121 for supporting the bent portions 61 of the pins 6, the inner side surface of the upper shell 11 is provided with a pressing strip 111 which is abutted against the bent part 61 of the pin 6.

In this embodiment, the pins 6 are copper pins 6, and when the upper shell 11 and the lower shell 12 are covered, the support 123 and the pressing strip 111 clamp the bent portions 61 of the pins 6 together.

In this design, after the copper pins 6 are inserted into the pin holes 121 of the lower shell 12, the lower shell 12 is provided with the reverse buckles 122, so that the copper pins 6 are fixed and cannot go out upwards. Furthermore, the upper shell 11 has a pressing strip 111 (plastic strip) to press the bending portion 61 of the copper pin 6, so as to prevent the copper pin 6 from going out upward. The copper pin 6 is bent at the rear end to form an L-shaped structure, and when the copper pin 6 is lifted downwards, the plastic support 123 on the lower shell 12 can effectively support the bent part 61 of the pin 6, so as to ensure that the copper pin 6 cannot be separated.

Under normal conditions, the design has no stress interference condition, ensures that the position of the lower shell 12 is not stressed, and also can ensure that the copper pin 6 cannot run out when the plug is pulled out. Through the fixing pin 6 with the structure, the stress of the lower shell 12 part is effectively reduced, the risk of the lower shell 12 bursting is avoided, the product quality is improved in design, and the generation of defects is reduced.

Referring to fig. 10, 12 and 13, specifically, the bent portion 61 of the pin 6 is bent from the other side of the rear end of the pin 6 back to the trip device 4, the tail end of the bent portion 61 extends toward one side of the rear end of the pin 6 and is provided with a connection post 62, the connection post 62 and one side of the rear end of the pin 6 form a through space 63, the tail end of the connection post 62 is tapered, and the connection post 62 is inserted into the PCB 2.

The copper pin 6 and the end of the PCB 2 are designed into a column structure, and the tail end of the connecting column 62 is cone-shaped. The copper pin 6 is formed by bending the copper pin 6, so as to connect the PCB 2, thereby eliminating the connecting wire between the copper pin 6 and the PCB 2. The bending part 61 of the pin 6 is bent towards the outer side direction of the tripping device 4, so that the copper pin 6 can effectively increase the distance between the copper pin 6 and the electromagnetic coil due to the empty space of the structure of the connecting column 62, and the electromagnetic coil can save the process of wrapping the rubber paper (the pin 6 is not empty, the distance between the pin 6 and the electromagnetic coil on the rubber core of the electromagnetic valve is very small, the electromagnetic coil needs the insulation of the rubber paper, and after the pin 6 is empty, the distance between the coil and the pin 6 is obviously increased). The tail end of the connecting column 62 is designed into a cone-shaped structure, so that the PCB 2 can be conveniently sleeved in the hole.

Referring to fig. 2, 4, and 11-14, specifically, the trip device 4 includes a reset key 41, a reset spring 42, an airplane frame 43, a linkage plate 44, a main elastic sheet 45, and a battery valve assembly, the reset key 41 is disposed through the PCB 2 and elastically connected to the PCB 2 through the reset spring 42, the airplane frame 43 is abutted against the front side of the lower case 12 (the front side of the lower case 12 is provided with a sliding slot 124 that is matched with the airplane frame 43 and allows the airplane frame 43 to slide up and down), the airplane frame 43 is provided with a fastening slot 431, the linkage plate 44 is provided with a fastening head 441, the battery valve assembly is disposed on the PCB 2 and connected to the linkage plate 44, the battery valve assembly drives the linkage plate 44 to move so that the fastening head 441 is fastened to the fastening slot 431, the reset key 41 is provided with a fastening slot 411, the fastening slot 442 for fastening the fastening slot 411 is disposed on the fastening head 441, one end of the main elastic sheet 45, the other end of the main elastic sheet 45 is elastically contacted with the airplane frame 43, and when the fastening head 441 on the linking sheet 44 is fastened to the fastening slot 411 on the reset key 41, the other end of the main elastic sheet 45 is electrically contacted with the bending portion 61 of the pin 6.

The linking plate 44 is provided with the buckling head 441, the buckling head 441 forms two buckling blocks due to the clamping position 442 in the middle of the buckling head 441, and after the linking plate 44 is arranged in the buckling groove 431 of the flying frame 43 by the buckling head 441, the linking plate 44 cannot fall off any more, so that the production is convenient, and the tripping process is not influenced.

Referring to fig. 2 and 14, specifically, the battery valve assembly includes a battery valve rubber core 461, a battery valve spring 462 and a linking shaft 463, an electromagnetic coil is sleeved outside the battery valve rubber core 461, the linking shaft 463 is inserted into the battery valve rubber core 461, two ends of the battery valve spring 462 are respectively abutted against an inner wall of the battery valve rubber core 461 and one end of the linking shaft 463, and the other end of the linking shaft 463 is connected to the linking sheet 44.

The linkage shaft 463 is an iron core arranged in the battery valve rubber core 461, when the electromagnetic coil is electrified to generate a magnetic field, the linkage shaft 463 can move back and forth in the battery valve rubber core 461, when the linkage shaft 463 moves forward, the linkage shaft 463 tightly supports the linkage sheet 44 towards the flying machine frame 43 direction, so that the buckle 441 on the linkage sheet 44 is buckled with the buckle groove 431 on the flying machine frame 43, when the linkage shaft 463 moves backward, the linkage shaft 463 drives the linkage sheet 44 to move away from the flying machine frame 43 direction, so that the buckle 441 on the linkage sheet 44 is buckled with the buckle groove 431 on the flying machine frame 43.

Referring to fig. 14, specifically, a protrusion 432 is disposed at an end of the airframe 43, and a groove 451 for engaging with the protrusion 432 is disposed at the other end of the main resilient piece 45.

The flyer frame 43 mainly plays a role of bearing the main elastic sheet 45 and releasing from the linkage sheet 44. The two ends of the airplane frame 43 are provided with the conical protruding blocks 432, the main elastic piece 45 is provided with the groove 451, and during assembly, the groove 451 of the main elastic piece 45 is assembled on the protruding blocks 432 of the airplane frame 43, so that the main elastic piece 45 can not be deviated left and right to touch the rubber shell.

Referring to fig. 11 to 13, specifically, the detecting device 3 includes a transformer, one end of the main elastic piece 45 extends through the center of the transformer, and the power line 5 is electrically connected to the main elastic piece 45.

The power line 5 passes through the center of the mutual inductor through the main elastic sheet 45, and the mutual inductor detects the current condition of the power line 5.

Referring to fig. 15, specifically, the transformer includes a housing 31, an annular metal core 32, a low voltage winding 33, and a high voltage winding 34, where the annular metal core 32 is disposed in the center of the housing 31, the low voltage winding 33 is wound on the annular metal core 32, two metal pins 35 are fixedly disposed on two opposite sides in the housing 31, the high voltage winding 34 is wound around the annular metal core 32 by one to two turns, two winding ends of the high voltage winding 34 are respectively connected to the two metal pins 35 on one side, two winding ends of the low voltage winding 33 are respectively connected to the two metal pins 35 on the other side, the housing 31 is integrated with the annular metal core 32, the low voltage winding 33, and the high voltage winding 34 by epoxy potting, and the metal pins 35 are electrically connected to the PCB 2.

The mutual inductor is an important component of the leakage protector. The transformer requires a set of windings to provide the analog leakage current. In general design, a detection lead penetrates through the middle of a mutual inductor, when a test switch is pressed down, a power supply is connected, a simulation leakage current is generated and passes through the mutual inductor, the mutual inductor induces a voltage, the voltage is transmitted to an IC (integrated circuit), the internal amplification and the like, and the SCR is finally pushed and released.

This embodiment is through setting up one to two circles of high voltage winding 34 winding annular metal magnetic core 32, and two wire winding heads of high voltage winding 34 are connected with two metal needles 35 of one side respectively, and two wire winding heads of low voltage winding 33 are connected with two metal needles 35 of opposite side respectively, make the utility model discloses an one end of mutual-inductor is traditional low pressure output, but the other end is high voltage output simultaneously. Through the arrangement, the high-voltage wire simulating the leakage current is placed in the mutual inductor, the manufacturing process of the part is moved to the mutual inductor, and though the high-voltage wire still needs to be threaded by hands, when the leakage current protector is assembled, the lead threading process is omitted on the PCBA, and the continuous automatic production can be realized. Moreover, the low-voltage end and the high-voltage end are arranged on two opposite sides of the shell 31, so that the exposed high voltage and low voltage have enough insulation distance, and the requirement of safety distance is met.

The high-voltage winding 33 and the low-voltage winding 33 are encapsulated by epoxy resin, and at the angle of safety regulation, the insulation distance (the requirement of safety regulation, the minimum distance requirement is 3.2mm) can be calculated without calculation, so that the consideration of the high-voltage distance and the low-voltage distance can be reduced, and the volume of the transformer can be finally reduced. And the winding head is lower than the epoxy resin encapsulation plane, so that the problem of mechanical collision wire breakage caused by exposure of the winding head is completely solved.

Referring to fig. 16, specifically, the housing 31 includes a bottom plate 311 and a surrounding wall 312 disposed on the bottom plate 311, a hollow column 313 is disposed in the center of the bottom plate 311, the annular metal magnetic core 32 is sleeved on the hollow column 313, one end of the main elastic piece 45 extends through the hollow column 313, a fastening position 3111 is disposed on the bottom plate 311, a fastening piece 452 fastened to the fastening position 3111 is disposed on the main elastic piece 45, a fixing column 125 is disposed on an inner side surface of the lower shell 12, positioning grooves 1251 are disposed on two side surfaces of the fixing column 125, a positioning rib 453 engaged with the positioning groove 1251 is disposed at one end of the main elastic piece 45, and when the hollow column 313 is sleeved on the fixing column 125, the positioning rib 453 on the main elastic piece 45 is clamped into the positioning groove 1251 on the fixing column 125.

The transformer is provided with a hollow column 313 and two buckling positions 3111, the main elastic sheet 45 is in a three-dimensional L shape, one end of the main elastic sheet is provided with a silver contact and a groove 451, and the middle part of the main elastic sheet is provided with two buckling pieces 452. The end of the main elastic sheet 45 without the silver contact is firstly sleeved into the hollow column 313 of the mutual inductor, then the buckle piece 452 is sleeved into the buckle position 3111 of the mutual inductor, and the mutual inductor and the main elastic sheet 45 are assembled into a semi-finished product.

The middle portion of the lower case 12 has a protruding flat rubber column (fixing column 125), and two positioning grooves 1251 are formed on two sides of the flat rubber column. The flying frame 43 assembly is mounted on the upper and lower shells 12, and then the semi-finished product of the mutual inductor/main spring 45 is sleeved into the flat rubber column and buckled with the lower shell 12.

With the structure, the main elastic sheet 45 can be effectively fixed between the mutual inductor and the lower shell 12, and can be well fixed up and down, left and right.

Referring to fig. 13 and 16, specifically, the power line 5 is connected to the main resilient tab 45 through a connection terminal 51, one side of the connection terminal 51 is provided with a riveting tab 511 riveted to the power line 5, and the other side of the connection terminal 51 is provided with an insertion tab 512 inserted into a gap between the main resilient tab 45 and the hollow column 313.

The power line 5 is placed on one side of the wiring terminal 51, the riveting sheet 511 is riveted on the power line 5, the power line 5 is fixed in a riveting mode and then reinforced in a butt welding mode to form the wiring terminal 51, and a semi-finished product is manufactured.

When the PCB 2 and the transformer are assembled, the main elastic pieces 45 are disposed on two sides of the flat plastic column of the lower case 12, and the semi-finished product of the connecting terminal 51 can be inserted into a gap between the main elastic pieces 45 and the PCB 2 (i.e., a gap between the main elastic pieces 45 and the hollow column 313) and fixed by soldering tin. The main current of the design is in plane contact with the copper sheet of the main elastic sheet 45 through the copper sheet of the wiring terminal 51 and is fixed by soldering tin. The soldering tin not only fixes the two copper sheets, but also has the function of connection and conduction, so that the copper sheet of the wiring terminal 51 and the copper sheet of the main elastic sheet 45 can be in good contact.

Referring to fig. 17, specifically, a wire pressing block 521 and a wire pressing base 522 for clamping the power line 5 are further disposed in the housing 1, a wire pressing groove 5221 is formed in the wire pressing base 522, a clamping groove 5222 communicated with the wire pressing groove 5221 is formed in a side wall of the wire pressing base 522, the wire pressing block 521 is mountable in the wire pressing groove 5221, and a clamping block 5211 clamped with the clamping groove 5222 is disposed on a side wall of the wire pressing block 521.

This design presses the wire portions up and down with the wire pressing blocks 521 and the wire pressing bases 522, which reduces the stress on the assembly of the upper and lower cases 12. The durability of the upper and lower cases 12 is further improved. The power cord 5 is also sleeved with a cord sleeve 53, and when the upper shell 11 and the lower shell 12 are covered, the upper shell 11 and the lower shell 12 clamp the cord sleeve 53.

The utility model discloses a earth-leakage protector global design is succinct, and the equipment is simple, goes up lower shell 12 and does not have the stress point except that the screw post, can solve and glue shell stress creep rupture problem.

The operation principle of the earth leakage protector according to the present embodiment will be described in detail below. It should be noted that, for those skilled in the art, the working principle of the earth leakage protector belongs to the common general knowledge in the field, and the following description is only for clearly explaining the working process of the earth leakage protector, and is not to limit the protection scope of the present invention.

Description of the electronic principles:

fig. 18 shows a circuit diagram of a leakage protector with an automatic monitoring function, only leakage protection will be described below, and the automatic monitoring part is not in this patent scope.

When the earth leakage protector is connected with a load, current flows from the L pole to the N pole through the load, and the current flowing in is equal to the current flowing out.

When the incoming and outgoing currents are balanced, the transformer does not have any reaction. However, when electricity leaks for some reason, the electricity will flow to the ground through the human body. At this time, the incoming current is larger than the outgoing current, and the transformer can sense the slight current difference and generate a voltage to be transmitted to the IC. The IC is amplified to send out a signal for switching on the SCR, after the SCR is switched on, the coil of the solenoid valve is also switched on to generate a magnetic field, the linkage shaft 463 is pulled, the linkage shaft 463 pulls the linkage sheet 44 to finally trip, and the two main elastic sheets 45 are simultaneously opened and powered off.

The earth leakage protector has a group of test circuits, and is connected with a test switch and a voltage reduction resistor, and passes through a mutual inductor. When the test switch is pressed, an analog current (about 10 mA) is generated between L/N. When the mutual inductor senses the leakage current, the mutual inductor can be tripped and cut off the power supply according to the principle.

Description from a mechanical structural point of view:

when the copper pin 6 is inserted into the socket, the current will take electricity from the pin 6 and reach the main spring sheet 45 through the silver contact; the main elastic sheet 45 is closely connected with the wiring terminal 51 and fixed by soldering tin; the terminals 51 are connected by caulking. The copper pin 6 is provided with a connecting point which is directly connected with the PCB 2; the solenoid valve assembly 46 and the mutual inductor are arranged on the PCB 2.

The electromagnetic valve is internally provided with an electromagnetic valve spring and a linkage shaft 463, the linkage shaft 463 is connected with a linkage sheet 44, and the linkage sheet 44 is connected with the flying machine frame 43. Normally, the linking shaft 463 is pushed outwards to make the linking sheet 44 catch 441 outwards, so as to block the slot 411 of the reset key 41. The reset key 41 is provided with a reset spring 42, and the reset spring 42 is clamped on the surface of the PCB 2.

When the reset key 41 is pressed, the reset key 41 moves downwards, and the slot 411 of the reset key 41 passes over the locking head 441 of the linkage sheet 44. The linking sheet 44 is pushed by the solenoid valve rubber core built-in solenoid valve spring to block the slot 411 of the reset key 41. When the reset key 41 is released, the spring of the reset key 41 pushes the reset key 41 upward. Because the linkage plate 44, the airplane frame 43 and the main elastic sheet 45 are in a synchronous structure, when the reset key 41 is moved upwards, the linkage plate 44, the airplane frame 43 and the main elastic sheet 45 are driven to move upwards simultaneously. The silver contact on the main spring plate 45 can touch the silver contact on the copper pin 6, and the current can flow to the main spring plate 45 through the silver contact and finally reaches the product.

Under the normal no electric leakage condition, the mutual-inductor response input/output current is balanced, and the earth leakage protector normal operating can not have any action. When some leakage conditions occur, the mutual inductor senses that the input current and the output current are unbalanced, the electronic circuit conducts the electromagnetic valve to generate a magnetic field, the linkage shaft 463 is pulled, the linkage shaft 463 pulls the linkage sheet 44, the fastening head 441 of the linkage sheet 44 is separated from the clamping groove 411 of the reset key 41, and the reset key 41 pushes the reset key 41 to rise by a spring. Because the linkage sheet 44, the airplane frame 43 and the main elastic sheet 45 are in a synchronous structure, when the reset key 41 is disengaged, the linkage sheet 44, the airplane frame 43 and the main elastic sheet 45 synchronously move downwards due to the downward elasticity of the main elastic sheet 45, the silver contact of the main elastic sheet 45 is disengaged from the silver contact of the copper pin 6, and the product is powered off.

The earth leakage protector has a test key 47, and the test key 47 is elastically connected to the PCB 2 through a test spring 48. When the test key 47 is pressed, the PCB board 2 generates an analog current (approximately 10mA or so) on the transformer. When the mutual inductor senses the leakage current, the mutual inductor can be tripped and cut off the power supply according to the principle.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by the technical solution of the present invention by those skilled in the art are all within the scope of the present invention as defined by the claims.

Claims

1. The utility model provides a leakage protector, includes that epitheca and inferior valve cover each other close the casing that forms, set up PCB board in the casing, locate detection device and trip gear on the PCB board, through the power cord that detection device and trip gear electricity are connected, participate in with the trip gear electricity is connected, the pin hole has been seted up to the inferior valve, the front end of participating in stretches out its characterized in that from participating in the hole: the medial surface of inferior valve is equipped with the back-off of the rear end one side of participating in the straining at participating in the hole edge, participates in the rear end another side and extends and buckle and be formed with the kink, the medial surface of inferior valve is provided with the support that supports participating in the kink along participating in the hole edge, the medial surface of epitheca is provided with the butt layering of propping of participating in the kink.

2. A leakage protector according to claim 1, wherein: the pin bending part is bent from the other side of the rear end of the pin to the back of the tripping device, the tail end of the bending part extends towards one side of the rear end of the pin and is provided with a connecting column, the connecting column and one side of the rear end of the pin form a through hole, the tail end of the connecting column is conical, and the connecting column is inserted on the PCB.

3. A leakage protector according to claim 1, wherein: the tripping device comprises a reset key, a reset spring, a flying frame, a linkage plate, a main elastic sheet and a battery valve assembly, wherein the reset key penetrates through the PCB and is elastically connected with the PCB through the reset spring, the flying frame supports against the front side surface of the lower shell, a catching groove is formed in the airplane frame, a catching head is arranged on the linkage plate, the battery valve assembly is arranged on the PCB and is connected with the linkage plate, the battery valve assembly drives the linkage plate to move to enable the catching head to be buckled with the catching groove, a clamping groove is formed in the reset key, a clamping position of the clamping groove is formed in the catching head, one end of the main elastic sheet is fixedly connected with the detection device, the other end of the main elastic sheet is elastically contacted with the airplane frame, and when the catching head on the linkage plate clamps the clamping groove on the reset key, the other end of the.

4. A leakage protector according to claim 3, wherein: the battery valve component comprises a battery valve rubber core, a battery valve spring and a linkage shaft, wherein an electromagnetic coil is sleeved outside the battery valve rubber core, the linkage shaft penetrates through the battery valve rubber core, two ends of the battery valve spring are respectively abutted against the inner wall of the battery valve rubber core and one end of the linkage shaft, and the other end of the linkage shaft is connected with a linkage sheet.

5. A leakage protector according to claim 3, wherein: the end of the flying frame is provided with a convex block, and the other end of the main elastic sheet is provided with a groove for clamping the convex block.

6. A leakage protector according to claim 3, wherein: the detection device comprises a mutual inductor, one end of the main elastic sheet extends through the center of the mutual inductor, and the power line is electrically connected with the main elastic sheet.

7. A earth-leakage protector according to claim 6, characterized in that: the mutual inductor comprises a shell, an annular metal magnetic core, a low-voltage winding and a high-voltage winding, wherein the annular metal magnetic core is arranged in the center of the shell, the low-voltage winding is wound on the annular metal magnetic core, two metal needles are fixedly arranged on two opposite sides in the shell, the high-voltage winding is wound on the annular metal magnetic core for 1-2 circles, two winding heads of the high-voltage winding are respectively connected with the two metal needles on one side, the two winding heads of the low-voltage winding are respectively connected with the two metal needles on the other side, the shell is integrated with the annular metal magnetic core, the low-voltage winding and the high-voltage winding through epoxy resin encapsulation, and the metal needles are electrically connected with a PCB.

8. A leakage protector according to claim 7, wherein: the shell comprises a bottom plate and a surrounding wall arranged on the bottom plate, wherein the center of the bottom plate is provided with a hollow column, an annular metal magnetic core sleeve is arranged on the hollow column, one end of a main elastic sheet extends through the hollow column, a buckling position is arranged on the bottom plate, a buckling piece buckled with the buckling position is arranged on the main elastic sheet, the inner side surface of the lower shell is provided with a fixed column, two side surfaces of the fixed column are provided with positioning grooves, one end of the main elastic sheet, which extends, is provided with a positioning convex rib matched with the positioning grooves, when the hollow column is sleeved on the fixed column, the positioning convex rib on the main elastic sheet is clamped into the positioning groove on.

9. A leakage protector according to claim 8, wherein: the power cord passes through binding post and is connected with main shell fragment, binding post is provided with the riveting piece with the power cord riveting on one side, binding post another side is provided with the inserted sheet that inserts main shell fragment and hollow post clearance.

10. A earth-leakage protector according to any of claims 1-9, characterized in that: the shell is also internally provided with a wire pressing block and a wire pressing seat for clamping a power wire, the wire pressing seat is provided with a wire pressing groove, the side wall of the wire pressing seat is provided with a clamping groove communicated with the wire pressing groove, the wire pressing block can be installed in the wire pressing groove, and the side wall of the wire pressing block is provided with a clamping block clamped with the clamping groove.