CN102957057B - Leakage-protection tripolar plug - Google Patents
Leakage-protection tripolar plug Download PDFInfo
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- CN102957057B CN102957057B CN201110241962.2A CN201110241962A CN102957057B CN 102957057 B CN102957057 B CN 102957057B CN 201110241962 A CN201110241962 A CN 201110241962A CN 102957057 B CN102957057 B CN 102957057B
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Abstract
The invention relates to a leakage-protection tripolar plug. When an electrical appliance is in electricity leakage, a first zero-sequence current transformer in the plug generates induced voltage due to the fact that changes of the vector sum of five wire current and null wire current reach a set range, the induced voltage is amplified by an amplifying circuit and then outputted to a control pole of an SCR (silicon controlled rectifier) to enable an anode and a cathode of the SCR to be on, and accordingly an electromagnetic field acting on an inner iron core can be generated by a trip coil, and the iron core moves to drive a lock plate, a reset column, a reset spring and a balance beam to be in linkage. A plug live wire and a live wire bolt, a plug null wire and a null wire bolt, and a ground wire and a ground wire bolt can be disconnected through the rotation force arm of a lever under driving of the balance beam, and accordingly the electrical appliance and a power source can be automatically disconnected when the electrical appliance is in electricity leakage.
Description
Technical field
The present invention relates to plug electric leakage protection technology field, particularly relate to a kind of leakage protection three-pole plug.
Background technology
Three-terminal polarized plus plug is by the device of the power delivery of band ground wire to electrical appliances such as refrigerator, motor, electronic equipments, it comprises the live wire latch, zero line latch and the ground wire latch that are connected or be separated from each other with the live wire of power supply, zero line and ground wire by pluggable mode respectively, and carries electric current.In prior art, live wire latch, zero line latch and ground wire latch are connected with plug ground wire with plug live wire, plug zero line respectively.So just can ensure that electrical appliance can immediately obtain or lose power supply while live wire latch, zero line latch and ground wire latch connect with live wire, zero line and ground wire respectively or be separated from each other.
But, when electrical appliance leaks electricity (as plug live wire and the misconnection of plug ground wire, plug zero line and the misconnection of plug ground wire etc.), the three-terminal polarized plus plug that prior art provides cannot in time by the disconnection of electrical appliance and power supply, must by being manually separated, this just easily causes the power-off of family, factory etc., may occur time serious to get an electric shock and fire incident, serious consequence is caused to production and life.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of leakage protection three-pole plug, automatically can disconnect the connection of electrical appliance and power supply when electrical appliance leaks electricity.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of leakage protection three-pole plug, and this plug comprises: connect the live wire latch of the live wire of power supply, zero line and ground wire, zero line latch and ground wire latch respectively; Respectively to plug live wire and the plug zero line of electrical appliance conveying live wire electric current, neutral line current; The plug ground wire be connected with the ground wire of described electrical appliance; This plug also comprises: a zero sequence current mutual inductor; Amplifying circuit; Controllable silicon SCR; Tripping coil; Be arranged in the iron core moved in described tripping coil electromagnetic field direction that is inner, that produce along it when described tripping coil has electric current; The iron core stage clip that one end is fixed, the other end is connected with described iron core; Locking plate; Back-moving spring; Be positioned at the reset post of described back-moving spring inside; Balance beam; Live wire lever and the live wire lever shaft being positioned at described live wire lever centre position; Zero line lever and the zero line lever shaft being positioned at described zero line lever centre position; The live wire movable contact spring, zero line movable contact spring and the ground wire movable contact spring that are connected with plug ground wire with described plug live wire, plug zero line respectively, can are connected with described live wire latch, zero line latch and ground wire latch respectively under the drive of described balance beam or are separated;
Wherein,
A described zero sequence current mutual inductor comprise a loop, through a described loop an induction coil, to be positioned at described induction coil inner to improve a magnet ring of the sensing capability of a described induction coil; Described plug live wire and plug zero line are all through a described loop; A described induction coil induces an induced voltage when the change that the vector of described live wire electric current and neutral line current occurs reaches setting range;
The input of described amplifying circuit is connected with the output of a described induction coil, to amplify a described induced voltage; The output of described amplifying circuit is extremely connected with the control of SCR; The anode of SCR is held be connected with No. one of described tripping coil, and negative electrode is connected with described plug zero line; No. two ends of described tripping coil are connected with described plug live wire;
Described iron core comprises the columniform body portion that couples together and the diameter columniform end less than described body portion, and the diameter of the two overlaps, and all identical with there being the direction of the electromagnetic field produced during electric current in described tripping coil;
Described locking plate comprises: the extruding plate of the cover contact pin of the sheet that bearing of trend is vertical with the diametric(al) of described end, sheet that bearing of trend is identical with the diametric(al) of described end, be connected the brace of the U-shaped sheet of described cover contact pin and described extruding plate; Described cover contact pin and described end socket-connect; The end of described extruding plate is notch;
Described reset post is diametric cylindrical perpendicular to described end, and its end is the inclined-plane mutually extruded with the notch of described extruding plate; One end of described back-moving spring is connected with the top of described reset post, and the other end is connected with described balance beam;
Described balance beam is the cylindrical of the hollow vertical with the diametric(al) of described end, the space of its inside just to the notch of described extruding plate, to hold the inclined-plane of described reset post end;
One end of described live wire lever, zero line lever is all rigidly connected with described balance beam, and the other end is rigidly connected with described live wire movable contact spring, zero line movable contact spring respectively; Described ground wire movable contact spring is connected with described balance beam.
The invention has the beneficial effects as follows: in the present invention, after live wire latch, zero line latch and ground wire latch connect with the live wire of power supply, zero line and ground wire respectively, when electrical appliance leakproof, live wire movable contact spring, zero line movable contact spring and ground wire movable contact spring are connected with ground wire latch with live wire latch, zero line latch respectively, thus by power delivery to electrical appliance, realize the power supply to electrical appliance.Leak electricity (as plug live wire and the misconnection of plug ground wire at electrical appliance, plug zero line and the misconnection of plug ground wire etc.) when, the vector of live wire electric current and neutral line current changes, an induction coil of a zero sequence current mutual inductor under the excitation effect of a magnet ring in induce an induced voltage, through the amplification of amplifying circuit, an induced voltage after this amplification is as triggering signal, control the anode and the negative electrode conducting that are originally in the SCR of off-state, thus make in tripping coil, there has been electric current, so just create electromagnetic field in tripping coil inside, thus drive the iron core of tripping coil inside to move along electromagnetic field direction, stretching iron core stage clip on the one hand, thus the restoring force that generation one is reverse, tripping coil inside is deviate to prevent iron core, on the other hand, the motion of iron core drives again the motion of locking plate, by the notch of its extruding plate end to the extruding on the inclined-plane of reset post end, reset post is made to drive back-moving spring to move, back-moving spring pulls balance beam again, make it that certain displacement occur, and then ground wire latch is separated with ground wire movable contact spring, and pass through the rotary arm effect of lever, by live wire latch, zero line latch respectively with live wire movable contact spring, zero line movable contact spring is separated, like this, just achieve three-phase electricity (the live wire latch of power supply, zero line latch, ground wire latch side) and electrical appliance (plug live wire, plug zero line and plug ground wire side) be separated, automatically the connection of electrical appliance and power supply is disconnected when electrical appliance leaks electricity.
On the basis of technique scheme, the present invention can also do following improvement:
Further, also comprise shell, a described zero sequence current mutual inductor, amplifying circuit, SCR, tripping coil, iron core, iron core stage clip, locking plate, back-moving spring, reset post, balance beam, live wire lever, live wire lever shaft, zero line lever, zero line lever shaft, live wire movable contact spring, zero line movable contact spring and ground wire movable contact spring all wrap up with anticreep by it.
Further, described shell comprises upper cover and the lower cover of mutual split.
Further, also comprise No. two zero sequence current mutual inductors, it comprise No. two loops, through described No. two loops No. two induction coils, to be positioned at described No. two induction coils inner to improve No. two magnet rings of the sensing capability of described No. two induction coils;
Described plug ground wire is through described No. two loops; Described No. two induction coils induce No. two induced voltages when the change that the vector of ground line current occurs reaches preset range;
The output of described No. two induction coils is connected with the input of described amplifying circuit, amplifies so that described No. two induced voltages are sent into described amplifying circuit.
Further, also comprise that two ends are connected with described ground wire latch with described plug ground wire respectively, the ground wire leak current fault indicator light luminous when described plug live wire is connected with described plug ground wire.
Further, also comprise: the test lead that two ends are connected with plug zero line with described plug live wire respectively, the testing button be positioned on described test lead.
Further, also comprise:
A piezo-resistance in parallel with SCR;
And/or, No. two piezo-resistances that two ends are connected with plug zero line with described plug live wire respectively.
Further, also comprise: the live wire static contact, zero line static contact and the ground wire static contact that are connected with described live wire latch, zero line latch and ground wire latch respectively;
Under the drive of described balance beam, described live wire movable contact spring, zero line movable contact spring can with ground wire movable contact spring contact with described live wire static contact, zero line static contact with ground wire static contact or be separated respectively, to realize being connected with described live wire latch, zero line latch with ground wire latch or being separated respectively.
Further, also comprise:
Lay respectively at described live wire movable contact spring and the silver point on described live wire static contact, in the position that the two contacts;
And/or, lay respectively at described zero line movable contact spring and the silver point on described zero line static contact, in the position that the two contacts;
And/or, lay respectively at described ground wire movable contact spring and the silver point on described ground wire static contact, in the position that the two contacts.
Further, when described ground wire movable contact spring is separated with described ground wire static contact, therebetween distance meets following condition: under the drive of described balance beam, and the moment that the moment that described ground wire movable contact spring and described ground wire static contact come in contact comes in contact than described live wire movable contact spring and described live wire static contact is Zao;
And/or,
The length of described live wire lever meets following condition: under the drive of described balance beam, and the moment that the moment that described live wire movable contact spring is separated with described live wire static contact is separated with described ground wire static contact than described ground wire movable contact spring is Zao;
And/or,
The length of described zero line lever meets following condition: under the drive of described balance beam, and the moment that the moment that described zero line movable contact spring is separated with described zero line static contact is separated with described ground wire static contact than described ground wire movable contact spring is Zao.
Accompanying drawing explanation
Fig. 1 is the profile of leakage protection three-pole plug provided by the invention;
Fig. 2 is the profile of the actuating mechanism in leakage protection three-pole plug provided by the invention;
Fig. 3 is the structure chart of circuit part in leakage protection three-pole plug provided by the invention.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Fig. 1 is the profile of leakage protection three-pole plug provided by the invention, and Fig. 2 is the profile of the actuating mechanism in leakage protection three-pole plug provided by the invention, and Fig. 3 is the structure chart of circuit part in leakage protection three-pole plug provided by the invention.Same as the prior art, this leakage protection three-pole plug comprises: connecing the live wire latch of the live wire of power supply, zero line and ground wire, zero line latch and ground wire latch respectively (has three latches in Fig. 1, represent live wire latch, zero line latch and ground wire latch respectively, conceal in its live wire latch and zero line latch in Fig. 2, two other generic reference numeral is 9), respectively to electrical appliance conveying live wire electric current, neutral line current with the plug live wire of powering to it and plug zero line (respectively as the HOT in Fig. 3, shown in NE line), the plug ground wire (as shown in the Green/Yellow line in Fig. 3) be connected with the ground wire of electrical appliance, here live wire latch, zero line latch is connected with power supply with ground wire latch, it is the circuit as power supply side, and plug live wire, plug zero line and plug ground wire are the circuits as electrical appliance side, when there is electric leakage in electrical appliance, rely on manual type by the live wire latch of this plug, zero line latch and ground wire latch and power supply disconnect, obviously the long time to be spent, this is unfavorable for the infringement reducing electric leakage accident.
In order to avoid above-mentioned problem, as Figure 1-3, this plug also comprises: a zero sequence current mutual inductor (be arranged in the position shown in label 2 of Fig. 2, represent in figure 3 with label M2); Amplifying circuit (it is the form of a chip, is arranged in the position that Fig. 2 label is 7, represents in Fig. 3 with JP1); Controllable silicon (SCR) (representing with Q1 in Fig. 3); Tripping coil (representing with L in Fig. 3); The iron core 12 moved in the electromagnetic field direction be arranged in tripping coil inside, producing when tripping coil has electric current along it; The iron core stage clip 13 that one end is fixed, the other end is connected with iron core 12; Locking plate 10; Back-moving spring 5; Be positioned at the reset post 4 of back-moving spring 5 inside; Balance beam 23; Live wire lever and the live wire lever shaft being positioned at live wire lever centre position; (Fig. 1 shows one group of live wire lever and live wire lever shaft, zero line lever and zero line lever shaft for zero line lever and the zero line lever shaft being arranged in zero line lever centre position, another group is identical with this group structure, be arranged in the back side of Fig. 1, and it is not shown, the lever illustrated and lever shaft are described with the example that is combined as of live wire lever and live wire lever shaft by the present invention, and label is with 15 and 16 respectively); The live wire movable contact spring 21, zero line movable contact spring (back side in FIG, not shown) and the ground wire movable contact spring 11 that are connected with plug ground wire with plug live wire, plug zero line respectively, can are connected with live wire latch, zero line latch and ground wire latch respectively under the drive of balance beam 23 or are separated.
As shown in Figure 3, zero sequence current mutual inductor M2 comprise a loop (as shown in the annulus in M2), through a loop an induction coil (as in M2 through shown in the curve of annulus), to be positioned at an induction coil inner to an induction coil excitation magnetic action, thus (Fig. 3 does not draw to improve the magnet ring of sensing capability of an induction coil, those skilled in the art can know this technical characteristic according to prior art), plug live wire HOT and plug zero line NE is all through a loop; Induction coil induces an induced voltage when the change that the vector of live wire electric current and neutral line current occurs reaches setting range.
Here, zero sequence current mutual inductor is power industry device used, and its work is based on Kirchhoff's current law (KCL), and the vector namely flowing into the electric current of any node in circuit must equal zero.When there is electric leakage accident, the vector of each phase current is non-vanishing, this non-vanishing fault current makes to produce magnetic flux in the annular core of zero sequence current mutual inductor (a namely above-mentioned loop and following No. two loops), under the excitation effect of magnet ring, through inducing induced electromotive force (a namely above-mentioned induced voltage and following No. two induced voltages) in the induction coil of this annular core.
Plug live wire HOT in the present invention and plug zero line NE is all through a loop of a zero sequence current mutual inductor, when there is not electric leakage, vector through the electric current (i.e. live wire electric current and neutral line current) of this loop is constant, thus an induced voltage can not be produced in an induction coil, when there is electric leakage, vector through the electric current of a loop changes, and like this, has just induced an induced voltage in an induction coil.
The input (as shown in 2, No. 3 ends of JP1 in Fig. 3) of amplifying circuit and the output of an induction coil are (as Fig. 3 passes shown in the two ends of the curve of M2 annulus, the i.e. two ends of electric capacity C5) be connected, to amplify an induced voltage; The output of amplifying circuit No. 7 ends of JP1 (in the Fig. 3) is extremely connected with the control of SCR (shown in the Q1 in Fig. 3); The anode of SCR is held be connected with tripping coil No. one, and negative electrode is connected with plug zero line, and No. two ends of tripping coil are connected with plug live wire.By this annexation, the induced voltage produced in an induction coil is after amplifying circuit amplifies, the control pole of SCR is output to as triggering signal, thus control SCR is in anode and the negative electrode conducting of off-state originally, like this, just there has been certain voltage at tripping coil two ends, thus had electric current wherein, also just create electromagnetic field in the inside of tripping coil, this electromagnetic field can be had an effect to the iron core 12 of tripping coil inside, is moved in its direction along electromagnetic field.Meanwhile, iron core stage clip 13 has reaction force to connected iron core 12, makes it cannot depart from the inside of tripping coil, which ensure that the stable of this three-terminal polarized plus plug structure.
Controllable silicon is the abbreviation of silicon controlled rectifier, is a kind of large power semiconductor device with the four-layer structure of three PN junctions, is also called thyristor.It has the features such as volume is little, structure is relatively simple, function is strong, is one of semiconductor device relatively commonly used.In performance, controllable silicon not only has unilateral conduction, but also has the controllability more more valuable than silicon rectifier cell (being commonly called as " dead silicon "), and namely its anode and negative electrode are under the control controlling pole, can only be in one of turn-on and turn-off two states.
Iron core 12 comprises: columniform body portion and the diameter columniform end less than body portion, the two is interconnected, and diameter overlaps, and the diameter of iron core 12 (i.e. the diameter of its body portion and end) is all identical with there being the direction of the electromagnetic field produced during electric current in tripping coil.The present invention is using the diametric(al) (i.e. the diametric(al) of end) of iron core 12 as directional reference, and the setting direction of other devices is all using this direction as reference direction.
As shown in Figure 2, locking plate 10 divides according to shape, three parts can be divided into, namely overlap contact pin, extruding plate and brace, three is sheet, wherein, the bearing of trend of cover contact pin is vertical with the diametric(al) of end, the bearing of trend of extruding plate is identical with the diametric(al) of the end of iron core 12, and brace is U-shaped, and it is for adapter sleeve contact pin and extruding plate.In addition, the end of cover contact pin and iron core 12 socket-connects, thus can to have an effect power to the end of iron core 12, and accepts the active force of end of iron core 12, and together moves both making.As shown in Figure 2, the end of extruding plate is notch, is the shape of bending fracture or linear fracture.
Reset post 4 is cylindrical, and its diametric(al) is perpendicular to the diametric(al) of the end of iron core 12, and its end is the inclined-plane that mutually can extrude with the notch of extruding plate.One end of back-moving spring 5 is connected with the top of reset post 4, thus can interact with reset post 4, and the other end of back-moving spring 5 is connected with balance beam 23, thus can interact with balance beam 23.Visible, by the connection of back-moving spring 5, reset post 4 just can interact with balance beam 23, thus realizes interlock.
Balance beam 23 is the cylindrical of hollow, its diametric(al) is vertical with the diametric(al) of the end of iron core 12, the space of its inside is just to the notch of extruding plate, to hold the inclined-plane of reset post 4 end, namely, as shown in Figure 2, when reset post 4 moves downward, the inclined-plane of its end is applying certain effect power left to make locking plate 10 to while left movement to the notch of extruding plate, this inclined-plane can also move downwardly to the space of balance beam 23 inside, thus prevents the inclined-plane of reset post 4 end impaired.
One end of live wire lever 15, zero line lever is all rigidly connected with balance beam 23, the other end is rigidly connected with live wire movable contact spring 21, zero line movable contact spring respectively, like this, under the drive of balance beam 23, live wire lever 15 and zero line lever just can form a leverage with live wire lever shaft 16 and zero line lever shaft respectively, thus by the rotary arm effect of corresponding lever shaft, make live wire movable contact spring 21 realize being connected or being separated with zero line plug wire with live wire latch, zero line movable contact spring respectively.
In addition, as shown in Figure 2, ground wire movable contact spring 11 is connected with balance beam 23, and this annexation is the bonding relation in Fig. 2, and namely ground wire movable contact spring 11 is overlapped on the top of the overlapped points of balance beam 23, thus when balance beam 23 moves upward, ground wire movable contact spring 11 can be driven to move upward, and be connected with ground wire latch, when balance beam 23 moves downward, drive again ground wire movable contact spring 11 to move downward, thus be separated with ground wire latch.
As can be seen here, in the present invention, after live wire latch, zero line latch and ground wire latch connect with the live wire of power supply, zero line and ground wire respectively, when electrical appliance leakproof, live wire movable contact spring, zero line movable contact spring and ground wire movable contact spring are connected with ground wire latch with live wire latch, zero line latch respectively, thus power supply is provided three extremely electricity be transferred to electrical appliance through three movable contact springs and the plug live wire, plug zero line and the plug ground wire that are connected respectively with each movable contact spring, realize the power supply to electrical appliance.Leak electricity (as plug live wire and the misconnection of plug ground wire at electrical appliance, plug zero line and the misconnection of plug ground wire etc.) when, the vector of live wire electric current and neutral line current changes, an induced voltage is induced in an induction coil of a zero sequence current mutual inductor, through the amplification of amplifying circuit, an induced voltage after this amplification is as triggering signal, control the anode and the negative electrode conducting that are originally in the SCR of off-state, thus make in tripping coil, there has been electric current, so just create electromagnetic field in tripping coil inside, thus drive the iron core of tripping coil inside to move along electromagnetic field direction, stretching iron core stage clip on the one hand, thus the restoring force that generation one is reverse, tripping coil inside is deviate to prevent iron core, on the other hand, the motion of iron core drives again the motion of locking plate, by the notch of its extruding plate end to the extruding on the inclined-plane of reset post end, reset post is made to drive back-moving spring to move, back-moving spring pulls balance beam again, make it that certain displacement occur, and then ground wire latch is separated with ground wire movable contact spring, and pass through the rotary arm effect of lever, by live wire latch, zero line latch respectively with live wire movable contact spring, zero line movable contact spring is separated, like this, just achieve three extremely electric (live wire latches of power supply, zero line latch, ground wire latch side) and electrical appliance (plug live wire, plug zero line and plug ground wire side) be separated, automatically the connection of electrical appliance and power supply is disconnected when electrical appliance leaks electricity.
As shown in Figure 3, this three-terminal polarized plus plug also comprises No. two zero sequence current mutual inductor M1, it comprise No. two loops (for a kind of annular core), through No. two loops No. two induction coils (through shown in the curve of No. two loops in M1), be positioned at No. two induction coil inside, be used for No. two magnet rings (not drawing in Fig. 3) of sensing capability of raising No. two induction coils by excitation.
Plug ground wire (wire shown in Green/Yellow) is through No. two loops, like this, the change that No. two induction coils just can occur at the vector of ground line current reaches preset range, induce No. two induced voltages by the excitation effect of No. two magnet rings;
The output of No. two induction coils two ends of curve (namely in M1) is connected with the input (holding for 2, No. 3 of JP1) of amplifying circuit, amplifies so that No. two induced voltages are sent into amplifying circuits.
By this structure, the present invention can also when electrical appliance ground wire (i.e. plug ground wire) leaks electricity, No. two changes of induction coil to ground line current vector are utilized to react, produce No. two induced voltages and it is amplified, No. two induced voltages after amplifying are carried out conducting SCR as triggering signal, thus make tripping coil produce induction field, this electromagnetic field drives iron core motion, and then through locking plate, reset post, back-moving spring, balance beam, live wire lever, the interlock of zero line lever, live wire movable contact spring is separated with live wire latch, zero line movable contact spring is separated with zero line latch, ground wire movable contact spring is separated with ground wire latch, realize the automatic disconnection of electrical appliance and power supply.
When live wire latch, zero line latch and ground wire latch respectively with the live wire of power supply, after zero line is connected with ground wire, can descend by the reset post 4 in Fig. 2, make the inclined-plane of its end to notch generation one active force left of locking plate 10, thus make locking plate 10 promote iron core 12 to be moved to the left, simultaneously, moving down of reset post 4 also produces an active force to back-moving spring 5, it is made to produce an active force to balance beam 23 adaptively, like this, balance beam 23 just drives live wire lever 15, zero line lever and ground wire movable contact spring 11 move, make live wire movable contact spring 21, zero line movable contact spring and ground wire movable contact spring 11 respectively with live wire latch, zero line latch is connected with ground wire latch, the circuit of turn-on power three extremely between electricity and electrical appliance, realize the power supply to electrical appliance.
Whether the three-terminal polarized plus plug that the present invention proposes also comprises a set of mechanism for testing, this mechanism for testing can be utilized can normally to work to test three-terminal polarized plus plug, if can, it is then utilized to power to electrical appliance, if can not, then change the plug of electrical appliance, prevent the harm of leaking electricity to electrical appliance.
As shown in Figure 3, this three-terminal polarized plus plug also comprises: the test lead that two ends are connected with plug zero line NE with plug live wire HOT respectively, the testing button K2 be positioned on test lead.In Fig. 3, the resistance R1 be located on test lead is to provide certain load, preventing the moment that testing button K2 presses with testing button K2, directly plug live wire HOT and the NE conducting of plug zero line is had an accident.
Press testing button K2, plug live wire HOT and plug zero line NE is just made to couple together, now this three-terminal polarized plus plug should disconnect the connection of electrical appliance and power supply automatically, this is the mark that three-terminal polarized plus plug can normally work, if really like this, then can unclamp testing button, utilize this three-terminal polarized plus plug to electrical appliance normal power supply, otherwise change plug.
In Fig. 3, this three-terminal polarized plus plug also comprises: a piezo-resistance MOVE1 in parallel with SCR, and in addition, this plug can also comprise No. two piezo-resistance MOV2 that two ends are connected with plug zero line with plug live wire respectively.
Piezo-resistance becomes with voltage at certain current/voltage scope internal resistance value, and alternatively resistance value is to the resistance of voltage-sensitive, and its material is semiconductor.Its maximum feature is, when the voltage at its two ends is lower than its threshold values, the electric current flowing through it is minimum, is equivalent to a valve of closing, and when voltage exceedes its threshold value, the electric current flowing through it increases sharply, and is equivalent to valve open.Utilize this function of piezo-resistance, can suppress the abnormal overvoltage often occurred in circuit, protective circuit is from superpotential infringement.
Visible, the present invention arranges piezo-resistance at SCR and between plug live wire and plug zero line, effectively can suppress SCR two ends and the abnormal overvoltage between plug live wire and plug zero line, protective circuit safety.
In the present invention, also for three-terminal polarized plus plug is provided with shell, a zero sequence current mutual inductor, No. two zero sequence current mutual inductors, amplifying circuit, SCR, tripping coil, iron core, iron core stage clip, locking plate, back-moving spring, reset post, balance beam, live wire lever, live wire lever shaft, zero line lever, zero line lever shaft, live wire movable contact spring, zero line movable contact spring, ground wire movable contact spring, live wire static contact, zero line static contact, ground wire static contact, each silver point, test lead, piezo-resistance, No. two piezo-resistances all wrap up, with anticreep and extraneous interference by it.
As shown in Figure 2, this shell comprises upper cover 6 and the lower cover 8 of mutual split.
In addition, also on shell, the tip position of reset post 4 is provided with a reset key, and it is corresponding with the tip position of reset post 4, makes with insulating material, when can prevent from manually pressing reset post 4, electric shock accidents occurs.
In the present invention, testing button is positioned on shell, and as shown in Figure 2, testing button label 3 represents.
Plug live wire, plug zero line and plug ground wire are wrapped in the insulation sheath shown in label 1, and removing two shown in a M1 and M2 zero sequence current mutual inductor, the circuit in Fig. 3 is arranged in the position that Fig. 2 label is 7.Also be provided with insulating barrier 18 in Fig. 1, contact with any two in ground wire latch with fire line latch, zero line plug wire.
It is the position of 2 that an above-mentioned zero sequence current mutual inductor and No. two zero sequence current mutual inductors are integrated in label in Fig. 2.
Three latch (live wire latches of three-terminal polarized plus plug, zero line latch and ground wire latch) respectively with three of power supply extremely electricity (live wires, zero line and ground wire) be connected, thus its major part is positioned at the outside of shell, sub-fraction is only had to be positioned at enclosure, this is unfavorable for live wire movable contact spring, the connection of zero line movable contact spring and ground wire movable contact spring and corresponding latch, consider that these connections are only electrical connection, thus the present invention propose three-terminal polarized plus plug be also provided with respectively with live wire latch, the live wire static contact that zero line latch is connected with ground wire latch, zero line static contact and ground wire static contact, these three static contacts are utilized to contact with corresponding movable contact spring respectively, realize the connection of movable contact spring and corresponding latch.
Like this, under the drive of balance beam 23, live wire movable contact spring 21, zero line movable contact spring can contact with ground wire static contact 17 with live wire static contact, zero line static contact respectively with ground wire movable contact spring 11, be connected with ground wire latch with live wire latch, zero line latch respectively to realize it, also can under the drive of balance beam 23, live wire movable contact spring 21, zero line movable contact spring can be separated with ground wire static contact 17 with live wire static contact, zero line static contact respectively with ground wire movable contact spring 11, be separated with ground wire latch with live wire latch, zero line latch respectively to realize it.
In the present invention, each movable contact spring, static contact and latch are electric conducting material, can ensure effective transmission of electricity.In order to improve the reliability of electric connection further, the silver point of certain area can be set respectively at the contact position of movable contact spring, static contact, namely respectively silver point is set on live wire movable contact spring and live wire static contact, these two silver points lay respectively at the position of the two contact, thus making the contact of live wire movable contact spring and live wire static contact become the direct contact of two silver points, this is conducive to the reliability that both raisings are electrically connected.Equally, also respectively silver point can be set on zero line movable contact spring and zero line static contact, these two silver points also respectively in the position of the two contact, can also arrange silver point respectively on ground wire movable contact spring and ground wire static contact, and these two silver points are also respectively in the position of the two contact.
As shown in Figure 3, in the three-terminal polarized plus plug that the present invention proposes, be also provided with that two ends are connected with ground wire latch with plug ground wire respectively, the ground wire leak current fault indicator light DS2 luminous when plug live wire is connected with plug ground wire.In addition, be also provided with that two ends are connected with plug zero line with plug live wire respectively, the source-drain malfunction indicator lamp DS1 luminous when plug live wire or plug zero line leak electricity (i.e. plug live wire to be connected with plug ground wire or plug zero line is connected with plug ground wire).
Resistance R8 and R2 connected with ground wire leak current fault indicator light DS2 and source-drain malfunction indicator lamp DS1 respectively in Fig. 3 can be the load that respective lines provides certain, prevents the harm that short circuit causes.
In fig. 2, also on the upper cover 6 of shell, being provided with lampshade 22, for covering above-mentioned ground wire leak current fault indicator light DS2 and source-drain malfunction indicator lamp DS1, preventing outside to its damage.
Because the current potential of live wire, zero line is higher than ground wire, it is more much bigger than the harm of ground wire electric leakage to there is electric leakage in these two circuits, therefore, connection moment of plug live wire and live wire latch, zero line latch and plug zero line should than the connection moment of ground wire latch and plug ground wire a little later, being separated the moment then should earlier, thus reduce live wire, the harm of zero line electric leakage to circuit as much as possible.
In the present invention, when ground wire movable contact spring 11 is separated with ground wire static contact 17, therebetween distance meets following condition: under the drive of balance beam 23, and the moment that the moment that ground wire movable contact spring 11 and ground wire static contact 17 come in contact comes in contact than live wire movable contact spring and live wire static contact is Zao.
In addition, the length of live wire lever 15 meets following condition: under the drive of balance beam 23, and the moment that the moment that live wire movable contact spring 21 is separated with live wire static contact is separated with ground wire static contact 17 than ground wire movable contact spring 11 is Zao.
In the present invention, zero line lever can be identical with live wire movable contact spring with live wire lever respectively with arranging of zero line movable contact spring, thus the length of zero line lever also meets following condition: under the drive of balance beam 23, and the moment that the moment that zero line movable contact spring is separated with zero line static contact is separated with ground wire static contact 17 than ground wire movable contact spring 11 is Zao.
Visible, the present invention is by arranging the distance between ground wire movable contact spring 11 and ground wire static contact 17, make plug live wire and live wire latch, zero line latch and plug zero line the connection moment should than the connection moment of ground wire latch and plug ground wire a little later, again by arranging the length of live wire lever and zero line lever, make plug live wire and live wire latch, zero line latch and plug zero line be separated the moment should than ground wire latch and plug ground wire to be separated the moment Zao, thus reduce the harm of live wire, zero line electric leakage as much as possible.
As can be seen here, the present invention has the following advantages:
(1) in the present invention, after live wire latch, zero line latch and ground wire latch connect with the live wire of power supply, zero line and ground wire respectively, when electrical appliance leakproof, live wire movable contact spring, zero line movable contact spring and ground wire movable contact spring are connected with ground wire latch with live wire latch, zero line latch respectively, thus power supply is provided three extremely electricity be transferred to electrical appliance through three movable contact springs and the plug live wire, plug zero line and the plug ground wire that are connected respectively with each movable contact spring, realize the power supply to electrical appliance.Leak electricity (as plug live wire and the misconnection of plug ground wire at electrical appliance, plug zero line and the misconnection of plug ground wire etc.) when, the vector of live wire electric current and neutral line current changes, an induction coil of a zero sequence current mutual inductor induces an induced voltage under the excitation effect of a magnet ring, through the amplification of amplifying circuit, an induced voltage after this amplification is as triggering signal, control the anode and the negative electrode conducting that are originally in the SCR of off-state, thus make in tripping coil, there has been electric current, so just create electromagnetic field in tripping coil inside, thus drive the iron core of tripping coil inside to move along electromagnetic field direction, stretching iron core stage clip on the one hand, thus the restoring force that generation one is reverse, tripping coil inside is deviate to prevent iron core, on the other hand, the motion of iron core drives again the motion of locking plate, by the notch of its extruding plate end to the extruding on the inclined-plane of reset post end, reset post is made to drive back-moving spring to move, back-moving spring pulls balance beam again, make it that certain displacement occur, and then ground wire latch is separated with ground wire movable contact spring, and pass through the rotary arm effect of lever, by live wire latch, zero line latch respectively with live wire movable contact spring, zero line movable contact spring is separated, like this, just achieve three extremely electric (live wire latches of power supply, zero line latch, ground wire latch side) and electrical appliance (plug live wire, plug zero line and plug ground wire side) be separated, automatically the connection of electrical appliance and power supply is disconnected when electrical appliance leaks electricity.
(2) the present invention can also when electrical appliance ground wire (i.e. plug ground wire) leaks electricity, No. two changes of induction coil to ground line current vector are utilized to react, produce No. two induced voltages and it is amplified, No. two induced voltages after amplifying are carried out conducting SCR as triggering signal, thus make tripping coil produce induction field, this electromagnetic field drives iron core motion, and then through locking plate, reset post, back-moving spring, balance beam, live wire lever, the interlock of zero line lever, live wire movable contact spring is separated with live wire latch, zero line movable contact spring is separated with zero line latch, ground wire movable contact spring is separated with ground wire latch, realize the automatic disconnection of electrical appliance and power supply.
(3) the invention provides the mechanism for testing of three-terminal polarized plus plug, can effectively prevent fault three-terminal polarized plus plug to the harm of electrical appliance.
(4) the present invention arranges piezo-resistance at SCR and between plug live wire and plug zero line, effectively can suppress SCR two ends and the abnormal overvoltage between plug live wire and plug zero line, protective circuit safety.
(5) the present invention is provided with the silver point of certain area at the contact position of movable contact spring and corresponding static contact, thus improves the reliability of electric connection.
(6) the present invention is by arranging the distance between ground wire movable contact spring 11 and ground wire static contact 17, make plug live wire and live wire latch, zero line latch and plug zero line the connection moment should than the connection moment of ground wire latch and plug ground wire a little later, again by arranging the length of live wire lever and zero line lever, make plug live wire and live wire latch, zero line latch and plug zero line be separated the moment should than ground wire latch and plug ground wire to be separated the moment Zao, thus reduce the harm of live wire, zero line electric leakage as much as possible.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a leakage protection three-pole plug, this plug comprises: connect the live wire latch of the live wire of power supply, zero line and ground wire, zero line latch and ground wire latch respectively; Respectively to plug live wire and the plug zero line of electrical appliance conveying live wire electric current, neutral line current; The plug ground wire be connected with the ground wire of described electrical appliance; It is characterized in that, this plug also comprises: a zero sequence current mutual inductor; Amplifying circuit; Controllable silicon SCR; Tripping coil; Be arranged in the iron core moved in described tripping coil electromagnetic field direction that is inner, that produce along it when described tripping coil has electric current; The iron core stage clip that one end is fixed, the other end is connected with described iron core; Locking plate; Back-moving spring; Be positioned at the reset post of described back-moving spring inside; Balance beam; Live wire lever and the live wire lever shaft being positioned at described live wire lever centre position; Zero line lever and the zero line lever shaft being positioned at described zero line lever centre position; The live wire movable contact spring, zero line movable contact spring and the ground wire movable contact spring that are connected with plug ground wire with described plug live wire, plug zero line respectively, can are connected with described live wire latch, zero line latch and ground wire latch respectively under the drive of described balance beam or are separated;
Wherein,
A described zero sequence current mutual inductor comprise a loop, through a described loop an induction coil, to be positioned at described induction coil inner to improve a magnet ring of the sensing capability of a described induction coil; Described plug live wire and plug zero line are all through a described loop; A described induction coil induces an induced voltage when the change that the vector of described live wire electric current and neutral line current occurs reaches setting range;
The input of described amplifying circuit is connected with the output of a described induction coil, to amplify a described induced voltage; The output of described amplifying circuit is extremely connected with the control of SCR; The anode of SCR is held be connected with No. one of described tripping coil, and negative electrode is connected with described plug zero line; No. two ends of described tripping coil are connected with described plug live wire;
Described iron core comprises the columniform body portion that couples together and the diameter columniform end less than described body portion, and the diameter of the two overlaps, and all identical with there being the direction of the electromagnetic field produced during electric current in described tripping coil;
Described locking plate comprises: the extruding plate of the cover contact pin of the sheet that bearing of trend is vertical with the diametric(al) of described end, sheet that bearing of trend is identical with the diametric(al) of described end, be connected the brace of the U-shaped sheet of described cover contact pin and described extruding plate; Described cover contact pin and described end socket-connect; The end of described extruding plate is notch;
Described reset post is diametric cylindrical perpendicular to described end, and its end is the inclined-plane mutually extruded with the notch of described extruding plate; One end of described back-moving spring is connected with the top of described reset post, and the other end is connected with described balance beam;
Described balance beam is the cylindrical of the hollow vertical with the diametric(al) of described end, the space of its inside just to the notch of described extruding plate, to hold the inclined-plane of described reset post end;
One end of described live wire lever, zero line lever is all rigidly connected with described balance beam, and the other end is rigidly connected with described live wire movable contact spring, zero line movable contact spring respectively; Described ground wire movable contact spring is connected with described balance beam.
2. plug according to claim 1, it is characterized in that, also comprise shell, a described zero sequence current mutual inductor, amplifying circuit, SCR, tripping coil, iron core, iron core stage clip, locking plate, back-moving spring, reset post, balance beam, live wire lever, live wire lever shaft, zero line lever, zero line lever shaft, live wire movable contact spring, zero line movable contact spring and ground wire movable contact spring all wrap up with anticreep by it.
3. plug according to claim 2, is characterized in that, described shell comprises upper cover and the lower cover of mutual split.
4. plug according to claim 1, it is characterized in that, also comprise No. two zero sequence current mutual inductors, it comprise No. two loops, through described No. two loops No. two induction coils, to be positioned at described No. two induction coils inner to improve No. two magnet rings of the sensing capability of described No. two induction coils;
Described plug ground wire is through described No. two loops; Described No. two induction coils induce No. two induced voltages when the change that the vector of ground line current occurs reaches preset range;
The output of described No. two induction coils is connected with the input of described amplifying circuit, amplifies so that described No. two induced voltages are sent into described amplifying circuit.
5. plug according to claim 4, is characterized in that, also comprises that two ends are connected with described ground wire latch with described plug ground wire respectively, the ground wire leak current fault indicator light luminous when described plug live wire is connected with described plug ground wire.
6. plug according to claim 1, is characterized in that, also comprises: the test lead that two ends are connected with plug zero line with described plug live wire respectively, the testing button be positioned on described test lead.
7. plug according to claim 1, is characterized in that, also comprises:
A piezo-resistance in parallel with SCR;
And/or, No. two piezo-resistances that two ends are connected with plug zero line with described plug live wire respectively.
8. plug according to claim 1, is characterized in that, also comprises: the live wire static contact, zero line static contact and the ground wire static contact that are connected with described live wire latch, zero line latch and ground wire latch respectively;
Under the drive of described balance beam, described live wire movable contact spring, zero line movable contact spring can with ground wire movable contact spring contact with described live wire static contact, zero line static contact with ground wire static contact or be separated respectively, to realize being connected with described live wire latch, zero line latch with ground wire latch or being separated respectively.
9. plug according to claim 8, is characterized in that, also comprises:
Lay respectively at described live wire movable contact spring and the silver point on described live wire static contact, in the position that the two contacts;
And/or, lay respectively at described zero line movable contact spring and the silver point on described zero line static contact, in the position that the two contacts;
And/or, lay respectively at described ground wire movable contact spring and the silver point on described ground wire static contact, in the position that the two contacts.
10. plug according to claim 8 or claim 9, it is characterized in that, when described ground wire movable contact spring is separated with described ground wire static contact, therebetween distance meets following condition: under the drive of described balance beam, and the moment that the moment that described ground wire movable contact spring and described ground wire static contact come in contact comes in contact than described live wire movable contact spring and described live wire static contact is Zao;
And/or,
The length of described live wire lever meets following condition: under the drive of described balance beam, and the moment that the moment that described live wire movable contact spring is separated with described live wire static contact is separated with described ground wire static contact than described ground wire movable contact spring is Zao;
And/or,
The length of described zero line lever meets following condition: under the drive of described balance beam, and the moment that the moment that described zero line movable contact spring is separated with described zero line static contact is separated with described ground wire static contact than described ground wire movable contact spring is Zao.
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| CN201110241962.2A CN102957057B (en) | 2011-08-22 | 2011-08-22 | Leakage-protection tripolar plug |
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| CN201110241962.2A CN102957057B (en) | 2011-08-22 | 2011-08-22 | Leakage-protection tripolar plug |
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| CN102957057B true CN102957057B (en) | 2015-04-15 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT515498B1 (en) * | 2014-02-19 | 2016-04-15 | Vaillant Group Austria Gmbh | safety switch |
| CN105655814B (en) * | 2015-12-31 | 2018-05-29 | 北京交通大学 | A kind of intelligent socket for energy internet |
| CN108011256B (en) * | 2016-12-20 | 2023-10-27 | 芜湖美的厨卫电器制造有限公司 | Leakage protection plug and electric water heater |
| CN107294060A (en) * | 2017-07-25 | 2017-10-24 | 天津贝罗尼生物科技有限公司 | A kind of air purifier earth leakage protective device |
| CN108461996B (en) * | 2018-04-07 | 2023-09-22 | 佛山市顺德区信辉达电子有限公司 | Tripolar on-off leakage protection plug |
| CN108493721B (en) * | 2018-04-07 | 2023-09-22 | 佛山市顺德区信辉达电子有限公司 | Tripolar on-off leakage protection plug |
| CN109462094B (en) * | 2018-10-30 | 2020-07-24 | 嘉兴市中法天线实业有限公司 | Anti-creeping plug for television |
| CN109541402B (en) * | 2019-01-04 | 2024-04-16 | 国网江苏省电力有限公司宿迁供电分公司 | Grounding control method for power grid movable mould system |
| CN113687132A (en) * | 2021-07-09 | 2021-11-23 | 北京中电飞华通信有限公司 | Electricity utilization monitoring system for machine room |
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| CN2626105Y (en) * | 2003-05-12 | 2004-07-14 | 无锡晶磊电子有限公司 | Electric leakage protector |
| CN200950533Y (en) * | 2006-09-12 | 2007-09-19 | 上海益而益电器制造有限公司 | Leakage detection protective circuit |
| CN202205981U (en) * | 2011-08-22 | 2012-04-25 | 通领科技集团有限公司 | Leakage protection three-pole plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2626105Y (en) * | 2003-05-12 | 2004-07-14 | 无锡晶磊电子有限公司 | Electric leakage protector |
| CN200950533Y (en) * | 2006-09-12 | 2007-09-19 | 上海益而益电器制造有限公司 | Leakage detection protective circuit |
| CN202205981U (en) * | 2011-08-22 | 2012-04-25 | 通领科技集团有限公司 | Leakage protection three-pole plug |
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