CN201490482U

CN201490482U - Power plug with electric leakage protection function

Info

Publication number: CN201490482U
Application number: CN2009201710638U
Authority: CN
Inventors: 黄华道
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-08-17
Filing date: 2009-08-17
Publication date: 2010-05-26
Anticipated expiration: 2019-08-17

Abstract

The utility model discloses a power plug with an electric leakage protection function, which is characterized in that a detection switch used for detecting whether the power plug is overdue or not is installed in the power plug. The detection switch consists of an elastic metal sheet and a metal sheet; one end of the elastic metal sheet is connected with a power live wire/zero wire, and the other end is hung in the air; and one end of the metal sheet is connected with a power zero wire/live wire through a resistor, and the other end is hung in the air. When a reset button on the power plug is in a breaking state, the elastic metal sheet is contacted with the metal sheet, and the detection switch is closed; and after the power input end of the power plug is connected with a power cord in a wall, simulation leakage currents are generated, and then the elastic metal sheet is cut off with the metal sheet, and the simulation leakage currents disappear.

Description

Attaching plug with creepage protection function

Technical field

The utility model relates to a kind of attaching plug, refers to a kind of attaching plug with creepage protection function especially.

Background technology

The attaching plug that people often use mainly is made of housing and two or three plug blade that are installed on the housing, one end of plug blade exposes the outside at housing, and the other end links to each other by power firestreak, zero line, the ground wire input on the control circuit board in lead and the household electrical appliance.When using household electrical appliance, only need plug blade with attaching plug be inserted in the supply socket and get final product.The effect of this attaching plug just is incorporated into the power supply in the socket on the household electrical appliance control circuit board; make its charged work; and for the leak current fault between plug outlet side live wire, zero line, ground wire; and the infringement that causes to household electrical appliance of the arcing fault that causes of plug outlet side live wire and zero line short circuit without any protective effect, the safeguard protection performance is relatively poor.

The attaching plug of creepage protection function has appearred having in the market; when having leakage current between attaching plug outlet side live wire, zero line, ground wire; mechanical component in this attaching plug moves immediately; reset button on the attaching plug is threaded off; the output of cutting off the electricity supply is in order to avoid the household electrical appliance that are attached thereto are damaged.Yet how this attaching plug with creepage protection function does not have life end checking function.When its end-of-life, concerning the user without any prompt facility, the reset button on the attaching plug still can reset, the load output of attaching plug still has power supply output, misleads the user and continues to use.When leaky occurring, this attaching plug does not have any protective effect, very easily causes the get an electric shock generation of dead accident of user, poor stability.

Summary of the invention

In view of the foregoing, the purpose of this utility model provides a kind of attaching plug with life end checking function and creepage protection function.After the power input of this attaching plug and the power line in the wall connected, automatic/hand produced the simulation leakage current, detected attaching plug and whether still had creepage protection function, be i.e. attaching plug end-of-life whether.If attaching plug is intact, have creepage protection function, the then leakage current detection protection circuit work in the attaching plug makes the mechanical device action that resets/trip in the attaching plug, waits for that reset button resets; Otherwise if the attaching plug end-of-life does not have creepage protection function, then the mechanical device that resets/trip in the attaching plug is failure to actuate, and reset button can't reset all the time, attaching plug non-transformer output all the time.

For achieving the above object, the utility model is taked following design: a kind of attaching plug with creepage protection function, it by housing, be installed in the assembly that power firestreak plug blade on the housing, zero line plug blade, ground wire plug blade be connected with the electric power realized in being installed in housing and be used to detect the attaching plug power supply output line and whether exist the control circuit of leak current fault to constitute; It is characterized in that:

In this attaching plug, be equipped with one and be used to detect the whether sense switch of end-of-life of attaching plug.Described sense switch is made of elastic sheet metal and sheet metal; One end of elastic sheet metal links to each other with the power firestreak/zero line that passes differential differentiating transformer, and the other end is unsettled; One end of sheet metal links to each other with zero-power line/live wire by resistance, and the other end is unsettled;

When the reset button on the attaching plug was in trip status, elastic sheet metal contacted with sheet metal, described sense switch closure; After the power input of attaching plug and the power line in the wall connected, automatic/hand produced the simulation leakage current, if attaching plug does not have end-of-life, immediately, elastic sheet metal and sheet metal disconnect, and the simulation leakage current disappears.

The utility model has the advantages that: safe and reliable, simple to operate, long service life, can guarantee the safety of user and power consumption equipment.

Description of drawings

Fig. 1 is the three-dimensional decomposition texture schematic diagram of the utility model;

Fig. 2 is each module position relational structure schematic diagram on the utility model control circuit board;

Fig. 3 is the utility model power supply input sheet metal and power supply output sheet metal position relational structure schematic diagram;

Fig. 4 is for after the utility model removes loam cake, the plan structure schematic diagram;

Fig. 5 is the utility model mechanical device structure schematic diagram that resets/trip;

Fig. 6-1 is the A-A partial sectional view of the utility model Fig. 4, and reset button is trip status, each module position relational structure schematic diagram when the power line in the power input of attaching plug and the wall is not connected;

Fig. 6-2 is the A-A partial sectional view of the utility model Fig. 4, and reset button is trip status, after the power line in the power input of attaching plug and the wall connects, and each module position relational structure schematic diagram in the attaching plug;

Fig. 6-3 is the A-A partial sectional view of the utility model Fig. 4, and reset button is pressed, and the reset guide lock below the reset button passes snap close, each module position relational structure schematic diagram in the attaching plug;

Fig. 6-4 is the A-A partial sectional view of the utility model Fig. 4, and reset button resets, when attaching plug has power supply output, and each module position relational structure schematic diagram in the attaching plug;

Fig. 6-5 is the A-A partial sectional view of the utility model Fig. 4, and the testing button reset button that is pressed is threaded off each module position relational structure schematic diagram in the attaching plug;

Fig. 7-1 is the B-B partial sectional view of the utility model Fig. 4, and reset button is trip status, waits for when reset button resets each module position relational structure schematic diagram in the attaching plug;

Fig. 7-2 is the B-B partial sectional view of the utility model Fig. 4, and reset button is pressed, and the reset guide lock below the reset button passes snap close, each module position relational structure schematic diagram in the attaching plug;

Fig. 7-3 is the B-B partial sectional view of the utility model Fig. 4, and reset button resets, each module position relational structure schematic diagram when attaching plug has power supply output;

Fig. 8 is the control circuit physical circuit figure () with life end checking function and creepage protection function that is installed in the attaching plug;

Fig. 9 is the control circuit physical circuit figure (two) with life end checking function and creepage protection function that is installed in the attaching plug.

Embodiment

As shown in Figure 1 and Figure 2, the disclosed attaching plug with creepage protection function of the utility model by housing, be installed in the assembly that power firestreak plug blade 23A, zero-power line plug blade 23B on the housing, ground wire plug blade 23 be connected with the electric power realized in being installed in housing and be used to detect the attaching plug power supply output line and whether exist the control circuit board 18 of leak current fault to constitute.

Above-mentioned housing is combined by loam cake 1, base 2 and load termination line terminals cover plate 2A.Loam cake 1 is provided with reset button hole, testing button hole, status indicator lamp hole.Reset button 8, testing button 7 and status indicator lamp LED pass loam cake 1 and contact with assembly on the circuit board 18.Shown in Fig. 6-1, all be covered with a protective cover A-2 on reset button 8 and the testing button 7, be covered with a condenser tube ferrule A-1 on the status indicator lamp LED.Base 2 is provided with the plug blade perforation of three standards, and power firestreak plug blade 23A, zero line plug blade 23B, ground wire plug blade 23 pass this perforation, expose outside housing.Be connected by screw between base 2, load termination line terminals cover plate 2A and the loam cake 1.

One end of power firestreak plug blade 23A, zero line plug blade 23B and ground wire plug blade 23 passes plug blade perforation on the base 2 and exposes outside at housing, and the other end is fixed on the circuit board 18.

As Fig. 2, Fig. 3, shown in Figure 4, power firestreak input sheet metal 50, zero-power line input sheet metal 51, power firestreak output sheet metal 23-M, zero-power line output sheet metal 23-N are installed on control circuit board 18.

Crooked 90 degree of one end of power firestreak input sheet metal 50 and zero-power line input sheet metal 51 are fixed on the circuit board 18, and the other end is respectively arranged with a moving

contact

54 and 55.

The end of power firestreak plug blade 23A and zero line plug blade 23B exposes outside housing, the other end extends side arm 50H, a 51H respectively, this

side arm

50H, 51H pass the differential differentiating transformer 19 that is used to detect leakage current and are fixed on circuit board 18, and contact with the end welding conducting of power firestreak input sheet metal 50 and zero-power line input sheet metal 51 respectively.

Load output at control circuit board 18 is provided with a pair of power firestreak output sheet metal 23-M, zero-power line output sheet metal 23-N.The end of power firestreak output sheet metal 23-M, zero-power line output sheet metal 23-N is enclosed within on power firestreak, the zero line output screw, and the other end is respectively equipped with a

fixed contact

15,16.

The fixed contact 15 of power firestreak output sheet metal 23-M end contacts with the moving contact 54 of power firestreak input sheet metal 50 ends or disconnects a pair of mains switch of formation; The fixed contact 16 of zero-power line output sheet metal 23-N end contact with the moving contact 55 of zero-power line input sheet metal 51 ends or disconnect formation another to mains switch.Do not reset in attaching plug reset button 8/when being trip status, the moving contact the 54, the 55th on fixed

contact

15,16 on the power supply output sheet metal and the power supply input sheet metal disconnects, and attaching plug load output terminal screw does not have power supply (electric power) output; After reset button 8 resetted, the fixed

contact

15,16 on the power supply output sheet metal contacted conducting with the moving

contact

54,55 that power supply is imported on the sheet metal, and attaching plug load output terminal screw has power supply (electric power) output.

As Fig. 2, shown in Figure 5, the mechanical device that resets/trip that can realize that electric power connects is installed also on control circuit board 18.This mechanical device that resets/trip comprises the reset guides lock 35 that is embedded in below the reset button 8, be enclosed within back-moving spring 91 on the reset guide lock 35 and fast trip spring 66-A, the pad 28A that resets, " T " font release 28, snap close 30, tripping coil 26,

sense switch

83,84.

" T " font release 28 is positioned at the below of reset button 8, with reset button 8 interlocks." T " font release 28 left and right sides stretch out to form and carry arm, and the pad 28A that resets is positioned at the below of reset button 8, the top of " T " font release 28.Reset pad 28A and release 28 can be combined, and moves up and down with release 28; Simultaneously, resetting pad 28A again can be separated from one another with release 28.In the framework of trip coil 26K of ccontaining reset pad 28A and release 28, be provided with and be used to limit the pad 28A positive stop 26H of minimum removable point downwards that resets.

When assembling release 28 and resetting pad 28A, shown in Fig. 7-1, power supply is imported

sheet metal

50,51 be placed on the top that arm is carried in release 28 left and right sides respectively, in release 28 and reset button 8 linkages from top to bottom, drive power supply

input sheet metal

51,50 and move up and down.

Have one in the centre of the pad 28A that resets and can make the reset guide lock 35 vertical clear opening 29A that pass, also have a central perforation longitudinally 29 in the centre of release 28, shown in Fig. 6-1, Fig. 7-1, the reset guide lock 35 that is with back-moving spring 91, fast trip spring 66-A that is embedded in reset button 8 bottom surfaces can move up and down along clear opening 29A, the central perforation 29 in the middle of the pad 28A that resets, the release 28.

Shown in Fig. 5, Fig. 6-1, the utility model is with two springs, 91, one fast trip springs of back-moving spring 66-A on reset guide lock 35.Fast trip spring 66-A can make reset button 8 quickly and reliably thread off, and moving contact and fixed contact are disconnected apace, thereby, prolong useful life of attaching plug greatly.

Reset guide lock 35 has a locked groove 36 that caves near its place, bottom, and the bottom surface of reset guide lock 35 is the plane.

Have a through hole 30E who runs through before and after it at the middle part of release 28, cross release 28 middle part through hole 30E and be provided with a snap close 30 of movably making, be provided with a bonnet lock hole 31 at the end face of snap close 30 by metal material.Shown in Fig. 6-1, be in trip status in reset button 8, the bottom surface that is contained in clear opening 29A in the middle of the pad 28A that resets, release 28, the reset guides lock 35 in the central perforation 29 be positioned at snap close 30 above, and be the dislocation shape with the bonnet lock hole 31 of snap close 30 end faces.Leading section at snap close 30 is provided with draw-in groove 31A.

Between the lateral wall of release 28 and snap close 30 madial walls, be provided with a latch spring 34.Be provided with a tripping coil 26 that is built-in with movable core 42 in the outside of snap close 30 sidewalls, tripping coil 26 built-in movable cores 42 face the sidewall of snap close 30.Snap close 30 can laterally move under the effect of iron core 42, thereby makes the bottom surface of the reset guide lock 35 under the reset button 8 penetrate or pass in the bonnet lock hole 31 of snap close 30 end faces, thereby reset button 8 is resetted or threads off (tripping operation).Be with turriform spring 42A in the end of movable core 42, shown in Fig. 6-1.

Shown in Fig. 5, Fig. 6-1, reset button 8 extends laterally a side arm 8A.Below side arm 8A, be provided with the excellent 4D in a top, below the excellent 4D in top, be provided with the lock bolt 4 of a hollow out, be installed with plate 4A in the inside at lock bolt 4 hollow out positions.Below lock bolt 4, be with a spring 97.The lower end of the top rod 4D of reset button 8 side arm 8A below is against on the end face 4B of lock bolt 4.

Shown in Fig. 5, Fig. 6-1, be provided with a sense switch in the side of release 28, this sense switch is made of elastic sheet metal 83 and sheet metal 84.Elastic sheet metal 83 is installed in the installing hole 82A of fixture 82, and sheet metal 84 is welded on the circuit board 18.As Fig. 8, shown in Figure 9, an end of elastic sheet metal 83 links to each other with the power firestreak/zero line that passes differential differentiating transformer 19, and the other end is unsettled; One end of sheet metal 84 is unsettled, and the other end links to each other with power input zero line/live wire through resistance.

Shown in Fig. 6-1, at the power input of attaching plug not when power line in the wall is connected, attaching plug is in initial condition, snap close 30 inserts the hollow-out parts of lock bolt 4, and be shelved on the plate 4A, the spring 97 of lock bolt 4 belows is compressed, and the bottom surface of reset guide lock 35 and the bonnet lock hole 31 of snap close 30 end faces are the dislocation shape.Elastic sheet metal 83 contacts with sheet metal 84, and sense switch is in closure state.

After the power input of attaching plug and the power line in the wall connect; because elastic sheet metal 83 contacts with sheet metal 84; sense switch is in closure state; as shown in Figure 8; the power input zero line links to each other with the power firestreak that passes differential differentiating transformer 19 through the

sheet metal

83,84 of contact, forms the closed-loop path, produces the simulation leakage current automatically; detect whether end-of-life of attaching plug, whether still have creepage protection function.If attaching plug does not have end-of-life, then there is electric current to flow through in the tripping coil 26, produce magnetic field in the tripping coil 26, shown in Fig. 6-2, be built in iron core 42 actions in the tripping coil 26, iron core 42 promotes snap close 30 and moves, and snap close 30 promotes sheet metal 83 again, sheet metal 83 is separated with sheet metal 84, and the simulation leakage current disappears; Simultaneously, under the effect of spring 97, lock bolt 4 moves up, the plate 4A at lock bolt 4 hollow out positions is inserted in the draw-in groove 31A of snap close 30 leading sections, make snap close 30 be fixed on this position, at this moment, the bonnet lock hole 31 of snap close 30 end faces just faces the bottom surface (shown in Fig. 7-1) of reset guide lock 35, waits for resetting of reset button 8.

Shown in Fig. 6-3, Fig. 7-2, push reset button 8, reset guide lock 35 successfully passes the bonnet lock hole 31 of snap close 30 end faces.Simultaneously, the side plate 8A of reset button 8 pushes up excellent 4D and pushes lock bolt 4 by the excellent 4D that bears down on one, and lock bolt 4 is moved down, and the plate 4A at lock bolt 4 hollow out positions separates with the draw-in groove 31A of snap close 30 leading sections.

Shown in Fig. 6-4, Fig. 7-3, discharge reset button 8, the locked groove 36 of reset guide lock 35 is stuck in the bonnet lock hole 31 of snap close 30, reset button 8 resets, moving

contact

54,55 on the power supply

input sheet metal

50,51 contacts conducting with the fixed

contact

15,16 that power supply is exported on sheet metal 23-M, the 23-N, and the load end of attaching plug has power supply output.Elastic sheet metal 83 still is in released state with sheet metal 84, and sense switch disconnects.

Shown in Fig. 2, Fig. 6-5, below testing button 7, be provided with elastic sheet metal 46 and sheet metal 47.

As shown in Figure 8, an end of elastic sheet metal 46 is fixed on the circuit board and with the power output end live wire that passes differential differentiating transformer and links to each other, the unsettled below that extends to testing button 7 of the other end.Below elastic sheet metal 46, be provided with a sheet metal 47, the one end be positioned at sheet metal 46 below, do not contact with sheet metal 46, the other end links to each other with the zero line of power input by resistance R 1.Perhaps, as shown in Figure 9, an end of elastic sheet metal 46 is fixed on the circuit board and by resistance R 1 and links to each other with the power output end live wire that passes differential differentiating transformer, the unsettled below that extends to testing button 7 of the other end.Below elastic sheet metal 46, be provided with a sheet metal 47, the one end be positioned at sheet metal 46 below, do not contact with sheet metal 46, the other end links to each other with the zero line of power input.

When testing button 7 is in release condition (shown in Fig. 6-1-Fig. 6-4), sheet metal 46 does not contact with sheet metal 47.Shown in Fig. 6-5, when testing button 7 was pressed, sheet metal 46 contacted conducting with sheet metal 47, and the power input zero line produces the simulation leakage current with the live wire short circuit that passes differential differentiating transformer.It is the power supply output of plug load end of cutting off the electricity supply that this simulation leakage current is used for the people, or whether detect the electric-leakage detection circuit work of this attaching plug normal.

Shown in Fig. 6-5, have at attaching plug under the state of power supply output, during the power supply output of the plug of wanting to cut off the electricity supply, push testing button 7, the test sheet metal 46 of testing button 7 belows is contacted with 47, manually produce the simulation leakage current, making in the tripping coil 26 has electric current to flow through, produce magnetic field, built-in iron core 26 actions wherein promote snap close 30 and move, the locked groove 36 of reset guide lock 35 breaks away from the bonnet lock hole 31 of snap close 30 end faces, reset button 8 is threaded off, attaching plug tripping operation, the output of cutting off the electricity supply.

In order to represent the state of attaching plug, the utility model is provided with the indicator light LED of expression attaching plug state.Shown in Fig. 6-1, the light that indicator light LED sends is exported by light lead pipe A-1.

In order to improve the useful life of attaching plug, avoid because the destruction that thunderbolt or the instantaneous pressure that causes of other reasons cause attaching plug and coupled external equipment, as Fig. 5, shown in Figure 9, the utility model is at power input live wire HOT that passes the differential differentiating transformer 19 that is used to detect leakage current and the lightning-arrest sheet metal 24A in tip that zero line WHITE place is connected with one group of right-angled triangle that is used to discharge or isoceles triangle shape, 25A, most advanced and sophisticated lightning-

arrest sheet metal

24A, 25A quite places, and the distance between the lightning-arrest sheet metal lower inside in two tips is greater than the distance between its upper inner.

When the live wire of power output end and zero line because thunderbolt or other reasons when causing instantaneous pressure; the air dielectric that is connected to the lightning-arrest sheet metal in tip at output live wire place and is connected between the lightning-arrest sheet metal in tip at output zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; the residue sub-fraction consumes by tripping coil SOL, piezo-resistance MOV, thus the safe operation of protection attaching plug and the miscellaneous equipment that links to each other with attaching plug.

Claims

1. attaching plug with creepage protection function, it by housing, be installed in the assembly that power firestreak plug blade on the housing, zero line plug blade, ground wire plug blade be connected with the electric power realized in being installed in housing and be used to detect the attaching plug power supply output line and whether exist the control circuit of leak current fault to constitute; It is characterized in that:

In this attaching plug, be equipped with one and be used to detect the whether sense switch of end-of-life of attaching plug.

2. the attaching plug with creepage protection function according to claim 1 is characterized in that: described sense switch is made of elastic sheet metal (83) and sheet metal (84); One end of elastic sheet metal (83) links to each other with the power firestreak/zero line that passes differential differentiating transformer (19), and the other end is unsettled; One end of sheet metal (84) links to each other with zero-power line/live wire by resistance, and the other end is unsettled;

When the reset button on the attaching plug was in trip status, elastic sheet metal (83) contacted with sheet metal (84), described sense switch closure; After the power input of attaching plug and the power line in the wall connected, automatic/hand produced the simulation leakage current, if attaching plug does not have end-of-life, immediately, elastic sheet metal (83) and sheet metal (84) disconnect, the disappearance of simulation leakage current.

3. the attaching plug with creepage protection function according to claim 2 is characterized in that: be provided with a snap close (30) movably in this attaching plug, be provided with draw-in groove (31A) at the leading section of snap close (30);

Be provided with a lock bolt in the side of reset button, be with a spring in the bottom of this lock bolt;

Described lock bolt is along with described snap close moves and moves.

4. the attaching plug with creepage protection function according to claim 3 is characterized in that: after the described simulation leakage current generating, if attaching plug does not have end-of-life, described lock bolt and snap close pin, and wait for that the attaching plug reset button resets; After reset button resetted, described lock bolt separated with snap close.

5. according to claim 1 or 2 or 3 or 4 described attaching plugs with creepage protection function, it is characterized in that: this attaching plug also comprises the lightning-arrest sheet metal (24A, 25A) in the tip of one group of right-angled triangle that is used to discharge or isoceles triangle shape;

Described tip sheet metal (24A, the 25) A that takes shelter from the thunder links to each other with zero line (WHITE) with the power input live wire (HOT) that passes the differential differentiating transformer (19) that is used to detect leakage current respectively;

The described tip sheet metal (24A, 25A) of taking shelter from the thunder is quite placed, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.

6. the attaching plug with creepage protection function according to claim 5 is characterized in that: be connected with reset guide lock below the attaching plug reset button; The bottom surface of described reset guide lock is the plane;

When reset button was in trip status, the bottom surface of described reset guide lock and the bonnet lock hole of described snap close end face were the dislocation shape.

7. the attaching plug with creepage protection function according to claim 6 is characterized in that: described reset button extend laterally a side arm (8A); Be provided with a top rod (4D) in the below of side arm (8A), be provided with described lock bolt in the below of top rod (4D), this lock bolt is an Openworks shape, is installed with plate (4A) in the inside at lock bolt (4) hollow out position; Be with described spring (97) in the below of lock bolt (4);

The lower end of the top rod (4D) of described reset button (8) side arm (8A) below is against on the end face (4B) of lock bolt (4);

Not when power line in the wall is connected, attaching plug is in initial condition at the power input of attaching plug, and snap close (30) inserts the hollow-out parts of lock bolt (4), and is shelved on the plate (4A), and the spring (97) of lock bolt (4) below is compressed;

After the power input of attaching plug and the power line in the wall connected, automatic/hand produced the simulation leakage current, and described snap close moves; Described lock bolt (4) pins with described snap close (30), and the bonnet lock hole (31) of snap close (30) end face just faces the bottom surface of reset guide lock (35), waits for resetting of reset button (8);

Push reset button (8), described lock bolt (4) separates with snap close (30);

Discharge reset button (8), the reset button success that resets.