CN201282245Y - Fire-proof anticreepage protective plug - Google Patents
Fire-proof anticreepage protective plug Download PDFInfo
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- CN201282245Y CN201282245Y CNU2008201325424U CN200820132542U CN201282245Y CN 201282245 Y CN201282245 Y CN 201282245Y CN U2008201325424 U CNU2008201325424 U CN U2008201325424U CN 200820132542 U CN200820132542 U CN 200820132542U CN 201282245 Y CN201282245 Y CN 201282245Y
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Abstract
The utility model relates to a compact and exquisite multifunctional fireproof and anticreep safety plug. The safety plug comprises an electromagnetic tripping device and a multifunctional auxiliary guard circuit which are mounted on a base plate, a dynamic iron core and each tripping device sleeved thereon, and a framework are mounted on the base plate, an insulation board is fixedly arranged in the center of a dynamic contact piece, and a permanent magnet is fixedly mounted on the insulation board in the position where the insulation board can attract a static iron core on the casing of the plug. When the accidents of overload, overvoltage, electric leakage, short circuit and/or overheat in the plug occur at the loading terminal of the plug, the guard circuit can control the tripping devices to automatically and rapidly conduct trip action to cut off the power supply. When the fireproof and anticreep safety plug is in normal operation, as long as the leakage current of a return circuit surpasses 5 to 10mA, the power-off operation can be completed in 25ms, so that the speed and the sensitivity of the power-off operation are remarkably enhanced, and a good protective role can be played for the low-current domestic electric appliances and hand-hold electric tools. The fireproof and anticreep safety plug relates to a mini-type fireproof and anticreep protection device with reliable fireproof performance.
Description
Technical field
The utility model relates to a kind of highly sensitive attaching plug with earth leakage protective, overcurrent protection, overtemperature protection, overvoltage protection and short-circuit protection function that can move with electrical appliance, the anticreep safeguard protection attaching plug of particularly a kind of quick fire prevention.
Background technology
The electrical leakage protection plug product of selling in the market; leakage current is 30mA; cross the human body electric current (human body be perfectly safe electric current 10mA) that is perfectly safe; human body there is not good protective effect; there are not overcurrent and short-circuit protection function yet; and overcurrent and short trouble all are the arch-criminals who causes fire; when overload appears in protection plug circuit; electric leakage; during faults such as short circuit; because plug does not have overcurrent and overheat protective function; can not cut off the electricity supply, in addition electrical appliance is on fire burn after, protector also do not have the tripping operation phenomenon happen occasionally; so gently then can burn out load appliance, heavy then can cause personal safety accident or fire.
Raising along with science and technology development and living standards of the people; the demand of protection plug safe in utilization is increasingly extensive, and for example, the on fire and short-circuit fire problem of overcurrent often appears in electric hand tool and home electric appliance plug; and for example, circuit causes that the problem of fire also constantly takes place.But the plug poor reliability of prior art, the following defective of ubiquity.
Special double-metal sheet type overcurrent fule shut-off valve, the situation that its overcurrent is a times could trip after following half an hour, and whatsoever the electronic apparatus electric current of sample does not burn immediately above one times, will be at once on fire, which has the reason of burning the half an hour burning-tolerant; Therefore bimetal leaf fule shut-off valve, double-metal sheet type miniature circuit breaker all do not have fire-proof function, moreover are the insufficiencies of safeguard protection, no earth leakage protective, functions such as no overvoltage protection, no overcurrent protection, no short-circuit protection, no high temperature protection; And complex structure, the manufacturing cost height.
The utility model people realizes that through studying discovery for a long period of time multiple safety protection function, key mainly are can realize highly sensitive quick response outage with trip gear by plug before electrical appliance is on fire on attaching plug.To plug with the basic demand of trip gear be: volume is little, in light weight, simple in structure, low cost of manufacture, dropout highly sensitive (30ms is following), the life-span is long and can bear frequent on/off operation etc.And the trip gear on the low-voltage electrical apparatus of prior art (as circuit breaker, protector etc.), big owing to its complex structure, manufacturing cost height, volume, thread off sensitive low, be not suitable for reason such as frequent operation occasion, so can not be as the trip gear of plug.
In order to improve the fire-proof and electric leakage-proof safety plug properties of product, to reduce cost, make it really to have the anticreep function of fire prevention.Because of this fire-proof and electric leakage-proof safety plug is more than existing bimetal leaf fule shut-off valve function, dependable performance is characterized in having comprehensive flameproof protection functions such as overvoltage fire prevention, overcurrent fire prevention, high temperature fire prevention, short circuit fire prevention, electric leakage, fire and earth leakage protective.
The utility model content
The purpose of this utility model is further to improve the sensitivity and the action stability of above-mentioned prior art protector; a kind of earth leakage protective that has is provided; overcurrent protection; overvoltage protection; the fire-proof and electric leakage-proof safety plug of overtemperature protection and the multiple safety protection function of short-circuit protection; the speed that not only trips is fast; simple in structure; volume is little; production cost is low; and long service life; stability is good; its leakage current just can cause tripping operation in human body is perfectly safe electric current 10mA scope; the tripping operation speed-controllable can promptly be finished outage automatically before electrical equipment is on fire in 17-25ms.
In order to realize above-mentioned utility model purpose, the utility model has adopted following technical scheme.
Fire-proof and electric leakage-proof safety plug comprises: be fixed in control circuit board on the insulation crust of described plug, be installed in electromagnetic tripping apparatus, zero-sequence transformer L1, current sensor L2, test button K1, a pair of static contact that corresponds respectively to center line N and phase line L and a pair of movable contact spring on the described control circuit board; and the static iron core on insulation crust that is fixedly mounted on described plug, this plug also comprises:
The substrate that constitutes by described control circuit board one; Reset switch assembly K, the main tripping coil L4 and short circuit tripping coil L3 and skeleton, the described trip gear action of control and the auxiliary circuit with multiple safety protection function suitable with it that have moving iron core are installed on described substrate; Described auxiliary circuit is by anti-overheated and/or leakage protection circuit, test testing circuit and comprise that the basic circuit of main trip circuit, short circuit trip circuit and rectification circuit constitutes.One end of described movable contact spring is fixedly mounted on the substrate in the mode of elastically deformable, the free end of described movable contact spring have be arranged on substrate on static contact one end on the moving contact of the corresponding setting of fixed contact.Insulation board is fixedly installed on the center of described movable contact spring, permanent magnet be fixedly mounted on insulation board can with the position of described static iron core adhesive on, the contact force of described moving contact and fixed contact is provided by elastic force that is installed in the back-moving spring on the substrate and described permanent magnet magnetic force.When plug itself take place overheated and/or the plug load end leaks electricity, when short circuit, overvoltage, over current fault, described auxiliary circuit control permanent magnet cooperates with moving iron core, movable contact spring is linked with insulation board to be swung to static iron core, make the disjunction simultaneously of described dynamic and static contact, thus automatic fast shut-off power supply.
One end of each static contact of described electromagnetic tripping apparatus is respectively equipped with fixed contact, the other end of each static contact respectively with the main circuit input mutually, center line the two poles of the earth La, Na connect, fixed contact is fixed on an end of static contact, and the other end that static contact is fixed on the substrate is told phase line (the L utmost point), center line (the N utmost point).
The end that each movable contact spring of described electromagnetic tripping apparatus is separately fixed on the described substrate is the U-shaped structure, and an end of each movable contact spring is equipped with moving contact, its other end respectively with main circuit mutually, center line the two poles of the earth Lc, Nc connect.Described insulation board and movable contact spring are fixing respectively by two rivets, so that movable contact spring can link with insulation board, by the strain of described U-shaped structure, make each movable contact spring wobbling action simultaneously, thus disjunction/closure when realizing between two pairs of dynamic and static contacts.The oscillating stroke of moving contact should satisfy the requirement greater than 3mm of the creepage distance that makes between moving contact and the fixed contact.
Described main tripping coil L4 and short circuit tripping coil L3 all are sleeved on outside the outer wall of the outer skeleton of moving iron core coaxially.The magnetic field and the permanent magnet same sex that described short circuit tripping coil L3 is produced when exchanging positive half cycle repelled each other by (energy deenergization), and there is a natural attraction between the sexes (can magnetize to magnet) for magnetic field that is produced when exchanging negative half period and permanent magnet.
Described reset switch assembly K is made up of the moving iron core, button key and the back-moving spring that are installed on the substrate, and the moving iron core of described reset switch assembly K slidably is inserted in the inwall of skeleton; Described back-moving spring is sleeved on the moving iron core; Described button key is fixedlyed connected with moving iron core.The concentric axis body that two diameters do not wait that is shaped as of described moving iron core is formed; Described back-moving spring is sleeved on the little axis body of described concentric axis body; Described button key is fixedly mounted on the place, end of the little axle of described concentric axis body; The big or small axis body of described concentric axis body intersects and formed the shaft shoulder that stops stopping function on the interface of big axis body, makes iron core be in stable state.
Described overheating protection circuit is made up of the temperature-sensitive switch KT in the main circuit that is connected in zero-sequence transformer L1 both sides, between phase line the two poles of the earth (N, L); In the basic circuit of described auxiliary circuit, described rectification circuit is made up of 4 diode D1-D4; Described main trip circuit is made up of integrated circuit (IC), controllable silicon VS, zero-sequence transformer L1, main tripping coil L4; Described short circuit trip circuit is made up of short circuit tripping coil L3 and main trip circuit.
Described auxiliary circuit can add overvoltage crowbar and/or surge protection circuit and/or current foldback circuit, and and/or power indicating circuit.Described overvoltage crowbar is made up of the piezo-resistance RV2 in the main circuit that is connected in zero-sequence transformer L1 both sides, between phase line the two poles of the earth (N, L); Described surge protection circuit is by the two poles of the earth that are connected in the main circuit output (Nb, Lb) the piezo-resistance RV1 between and anti-surge K switch 2 compositions; Described current foldback circuit is made up of current sensor L2; Described power indicating circuit is made up of light-emitting diode D1 that is connected on rectification circuit output end and resistance R 1, and when rectification circuit output end had electricity, light-emitting diode D1 was shinny, the indication power connection.
The phase line L of described main circuit passes zero-sequence transformer L1 and current sensor L2, forms the former limit of zero-sequence transformer L1 and current sensor L2 respectively; The center line N of described main circuit passes zero-sequence transformer L1, forms the former limit of zero-sequence transformer L1; The secondary of zero-sequence transformer L1 and current sensor L2 is connected respectively in the basic circuit of auxiliary circuit; Described short circuit tripping coil L3 is connected among the phase line L of main circuit.
Fire-proof and electric leakage-proof safety plug of the present utility model is when operate as normal, as long as the loop leakage current surpasses 6mA, will finish the action of threading off in 25ms, has significantly improved the speed of the protection people securities of the lives and property.Can not reset when the phase line center line connects inverse time, phase line, center line go offline to trip immediately and maybe can not reset, little electric current household electrical appliance and personal safety are played a very good protection, and be the reliable especially small-sized earth leakage protective device of a kind of fire protecting performance.
Description of drawings
Fig. 1 is the trip gear structural representation of fire-proof and electric leakage-proof safety plug embodiment of the present utility model.
Fig. 2 is the upward view of Fig. 1.
Fig. 3 is the circuit diagram of fire-proof and electric leakage-proof safety plug embodiment of the present utility model.
Embodiment
Fire-proof and electric leakage-proof safety attaching plug of the present utility model; its multi-functional being meant has short-circuit protection function; over-voltage protecting function; overload protection function; creepage protection function; overheat protective function; test measuring ability and power supply deixis; its high sensitivity is meant that it is by adopting new trip gear and suitable comprising overcurrent protection; earth leakage protective; short-circuit protection; overvoltage protection; five kinds of defencive function circuit of overtemperature protection and test testing circuit; main trip circuit; the short circuit trip circuit; power indicating circuit; the auxiliary circuit of basic circuits such as rectification circuit, thus it is fast to have tripping operation speed; highly sensitive characteristic.
With reference to accompanying drawing, fire-proof and electric leakage-proof safety plug of the present utility model mainly comprises: the auxiliary circuit of electromagnetic tripping apparatus 100, and the described trip gear action of its suitable control with multiple safety protection function 200, one group stretch out that the pin that is used for plugging with supply socket that equates with number of poles, one group of plug insulation crust equate with number of poles is used for the binding post that is connected with the power line of load appliance.As illustrated in fig. 1 and 2; fire-proof and electric leakage-proof safety plug of the present utility model comprises that a circuit board on the insulation crust that is fixed in described plug is as substrate 1; on described substrate 1, be mounted with electromagnetic tripping apparatus 100; zero-sequence transformer L1; current sensor L2; reset switch assembly K; test button K1; correspond respectively to a pair of static contact 22a of center line N and phase line L; 22b and a pair of movable contact spring 14a; 14b; one group of pin of plugging with supply socket of being used for that stretches out the plug insulation crust; one group is used for the binding post that is connected with the power line of load appliance and a static iron core 18 that is fixedly mounted on the described insulation crust.Described trip gear action of main tripping coil L4, short circuit tripping coil L3 and skeleton and control thereof and the auxiliary circuit with multiple safety protection function 200 suitable with it also are installed on substrate 1 of described plug, and this circuit is made of overcurrent protection, earth leakage protective, short-circuit protection, overvoltage protection, overheating protection circuit and test testing circuit, main trip circuit, short circuit trip circuit, power indicating circuit and rectification circuit.Described reset switch assembly K is made up of moving iron core 2, button key 4 and back-moving spring 3, is installed on the substrate 1.The end of movable contact spring 14a, the 14b of described trip gear 100 is fixedly mounted on the substrate 1 in the mode of elastically deformable, the free end of described movable contact spring has with two and is arranged on static contact 22a on the substrate 1, the moving contact 20 of fixed contact 21 corresponding settings on 22b one end, insulation board 16 is fixedly installed on the center of described movable contact spring 14a, 14b, by movable contact spring 14a and 14b wobbling action, realize the disjunction/closure of each moving contact 20 and fixed contact 21 simultaneously with insulation board 16 interlocks.A permanent magnet 19 is fixedly mounted on the central authorities of insulation board 16, the described moving contact 20 and the contact force of fixed contact 21 are provided by the elastic force of the back-moving spring on the substrate 13 and the magnetic force of described permanent magnet 19, by cooperating with moving iron core 2, drive the closure/disjunction of described dynamic and static contact (20,21).The magnetic field and permanent magnet 19 same sexes that short circuit tripping coil L3 is produced when exchanging positive half cycle are repelled each other by (energy deenergization), and there is a natural attraction between the sexes (can magnetize to magnet) for magnetic field that is produced when exchanging negative half period and permanent magnet 19.Be that described main tripping coil L4 is consistent with the magnetic direction that short circuit tripping coil L3 is produced, and this magnetic direction is opposite with the magnetic direction of permanent magnet 19.
See shown in Figure 3, the center line N of main circuit and phase line L all pass zero-sequence transformer L1 as its former limit, the phase line L of main circuit also passes current sensor L2 after passing zero-sequence transformer L1, as the former limit of current sensor L2, the secondary of zero-sequence transformer L1 and current sensor L2 is connected in the auxiliary circuit 200 by shown in Figure 3 respectively.As shown in Figure 1, a pair of L-shaped static contact 22a and 22b are separately fixed on the described substrate 1; End at each static contact 22a and 22b is respectively equipped with fixed contact 21, and the other end of each static contact 22a and 22b is connected with the two poles of the earth La, the Na (seeing shown in Figure 3) of main circuit input respectively; A pair of movable contact spring 14a and 14b are separately fixed on the described substrate 1, and the end of each movable contact spring 14a and 14b is equipped with moving contact 20, and its other end is connected with the two poles of the earth Lc, the Nc (seeing shown in Figure 3) of main circuit respectively.The end that described movable contact spring 14a and 14b and substrate 1 fix is the U-shaped structure, by the strain of this U-shaped structure, makes each movable contact spring 14a and 14b all can make wobbling action, so that realize the disjunction/closure of moving contact 20 and fixed contact 21.The oscillating stroke of described moving contact 20 is controlled at 3-4mm, both satisfied creepage distance between moving contact 20 and the fixed contact 21 greater than the requirement of 3mm (requirement of the disjunction distance of AC250V voltage regulation), satisfied highly sensitive requirement (stroke is short more, and the disjunction of dynamic and static contact/closed sensitivity is high more) again.Respectively described insulation board 16 is fixed with movable contact spring 14a, 14b by two rivets 17, so that movable contact spring 14a and 14b are together with insulation board 16 interlocks, disjunction/closure when realizing between two pairs of dynamic and static contacts (20,21).
As shown in Figure 2, fixed contact (21) is fixed on an end of static contact (22), the other end of static contact is fixed on the substrate 1, and tells phase line (the L utmost point), center line (the N utmost point).On the line of symmetry A-A of substrate 1, be provided with reset switch assembly K, it is made up of moving iron core 2, button key 4, back-moving spring 3.Be inserted into the concentric axis body composition that two diameters do not wait that is shaped as of the interior moving iron core 2 of skeleton (24) inwall, described back-moving spring (3) is sleeved on the little axis body of described concentric axis body, described button key (4) is fixedly mounted on the place, end of described little axle, little axle head passes substrate 1 fixedlys connected with button key 4 with back-moving spring 3 backs, the big or small axis body of described concentric axis body intersects and form the shaft shoulder on the faying face of big or small axis body, this shaft shoulder stop stopping function, guaranteed that moving iron core (2) is in stable state.
As shown in Figure 1, when permanent magnet 19 and moving iron core 2 not adhesives, permanent magnet 19 and static iron core 18 adhesives that are fixed on the insulation crust, insulation board 16 is attached on the static iron core 18, this moment, moving contact 20 was in the disjunction state with fixed contact 21, moving iron core 2 is under the elastic force effect of back-moving spring 3, and the shaft shoulder on it is attached on the substrate 1 so that it stablizes motionless (state as shown in Figure 1).A skeleton 24 that is fixed on substrate 1 centre is the cover barrel structure, the big shaft portion of moving iron core 2 slidably is sleeved in the cover bucket of skeleton 24, pass substrate 1, the cover Upper gasket, overlap upper reset spring 3 again, reset button on the card is so that moving iron core 2 can only move along the cover bucket axis direction of skeleton 24.Main tripping coil L4 and short circuit tripping coil L3 are housed on the cover bucket outer wall of skeleton 24, and main tripping coil L4 and short circuit tripping coil L3 are respectively by in the auxiliary circuit 200 that is connected on the substrate 1 shown in Figure 3.The utility model has adopted zero-sequence transformer L1 summation current transformer L2 simultaneously, after zero-sequence transformer L1 is passed at L, N the two poles of the earth, N extremely outwards bends, and stride across the N that is welded on substrate 1 behind the current sensor L2 and extremely go up, the L utmost point is welded on the L polar circuit that substrate is a circuit board 1 after passing current sensor L2 again, and be connected with short-circuited coil L3, the L that the other end of short-circuited coil L3 is welded on substrate 1 extremely goes up.During the electrical appliance operate as normal, because the current value of power supply phase line and center line is identical, magnetic direction is opposite, cancels out each other in magnetic field, and the induced voltage in the secondary coil of zero-sequence transformer L1 is zero.When leakage current occurring in the circuit, the current value of power supply phase line and center line is unequal, induces faint electric leakage signal voltage in the secondary coil of zero-sequence transformer L1, and when this voltage reached setting value, auxiliary circuit 200 triggered the controllable silicon auto power off.Because current sensor L2 has omitted primary coil, and can play supervisory function bit when no-voltage is above, the volume of the utility model plug can design forr a short time, reacts sensitiveer.
As shown in Figure 1, on substrate 1, also be provided with test button K1, test button K1 is a normal open switch, is connected in series between the two poles of the earth (N and L) of the zero-sequence transformer L1 both sides of main circuit load end, and test button K1 presses on the feeler switch movable contact spring that is welded on the circuit board.The auxiliary circuit of fire-proof and electric leakage-proof safety plug of the present utility model is solidificated on the substrate 1, and promptly substrate 1 is an identity element with the circuit board of auxiliary circuit, obviously, so greatly simplified structure, reduced volume, reduce cost, be convenient to assembling.So just constituted the leakage protecting plug of a very compact electromechanical integration.
As shown in Figure 3, auxiliary circuit of the present utility model comprises overload protecting circuit, leakage protection circuit, hookup, overvoltage protection/anti-surge protection circuit, overheating protection circuit, rectification circuit, main trip circuit, short circuit trip circuit and power indicating circuit.Trip gear of the present utility model can adopt the standardized circuit board of multiple functions such as having earth leakage protective, overload protection, overtemperature protection, overvoltage protection and short-circuit protection on the market to constitute adaptive substrate 1.In the circuit on substrate 1, also be provided with electronic components such as power supply indicator D1 and integrated circuit (IC), the connection of each electronic component as shown in Figure 3.When main circuit was connected, power supply indicator D1 was bright, otherwise does not work.Described overcurrent, leakage protection circuit are made up of elements such as secondary, diode D2, capacitor C 5 and the resistance R 4 of current sensor L2, R5, R6, RP.Described main trip circuit is made up of integrated circuit (IC), controllable silicon VS, main tripping coil L4, capacitor C 1-C3 etc.Described short circuit trip circuit is made up of short circuit tripping coil L3 and main trip circuit.Described surge protection/overvoltage crowbar is made up of piezo-resistance RV1, RV2.Described overheating protection circuit is made up of thermoswitch KT.Described rectification circuit is made up of diode D1-D4.Described power indicating circuit is made up of light-emitting diode D1 and resistance R 1.Described hookup is made up of test button K1, resistance R 2.K2 among Fig. 3 is anti-surge switch.
Below in conjunction with accompanying drawing 1 and Fig. 3, further describe the course of work and the operating principle of fire-proof and electric leakage-proof safety plug of the present utility model.
The following describes power-on servicing.The pin of the utility model plug is inserted supply socket, press the button key 4 again, the elastic force that the described moving iron core 2 of button key 4 drives overcomes back-moving spring 3 moves to the direction of permanent magnet 19, makes iron core 2 contact adhesive with permanent magnet 19; Again hand is unclamped from button key 4, this moment is under the elastic force effect of back-moving spring 3, moving iron core 2 drives permanent magnet 19, insulation board 16 and movable contact spring 14a, 14b and shifts to static contact 22a and 22b, contacts closure with fixed contact 21 until moving contact 20, and main circuit is connected.This shows,, yet again pin is inserted supply socket, still normal energized if make the dynamic and static closing of contact as reset operation earlier.From the operating process of above energized as seen, moving contact 20 is to be provided by the elastic force of back-moving spring 3 and the magnetic force of permanent magnet 19 with the contact force of fixed contact 21, so the size of this contact force is stable, controllable.By the resiliency characteristics coefficient of appropriate design back-moving spring 3 and the magnetic force property coefficient of permanent magnet 19, the contact resistance between the dynamic and static contact can be controlled at desirable scope.
The following describes the process of manual deenergization test protector.Moving, under the state of fixed contact closure (being energized), as press test button K1 (normal open switch) and make its connection, this moment, the secondary of zero-sequence transformer L1 can induce a faint simulation electric leakage signal, this signal is given trip circuit, and amplify through integrated circuit (IC), relatively the back upset is high level, this high level is exported to controllable silicon VS by 7 pin of IC, trigger controllable silicon VS conducting, make the electric current increase in the main tripping coil L4 and in moving iron core 2, produce the magnetic field of repelling each other with permanent magnet 19, permanent magnet 19 scolded out and drive moving contact 20 and fixed contact 21 disjunctions, main circuit is disconnected, thereby realize the operation of manual deenergization.From above manual operating process as seen, the function of test button K1 has two, and the one, realize the hand off power operation by test button K1, the 2nd, whether normal by the safety protection function of test button K1 test circuit and component of machine.
The following describes when main circuit is short-circuited, automatic dropout outage course of action when overload and leak current fault.When short circuit current flows through short circuit tripping coil L3 and/or main tripping coil L4, this electric current makes iron core 2 produce magnetic force, the magnetic force of this magnetic force and permanent magnet 19 repels mutually, this repulsive force drives permanent magnet 19, insulation board 16 and movable contact spring 14a, 14b and moves down, and makes moving contact 20 and fixed contact 21 disjunctions (state as shown in Figure 1).When overload current or leakage current occurring on main circuit the two poles of the earth, directly can make the secondary of zero-sequence transformer L1 induce electric leakage signal, this electric leakage signal causes as said process and cuts off the electricity supply.
Since the L that short circuit tripping coil L3 directly is connected on main circuit extremely in, so when the phase line L utmost point of the load end of main circuit is short-circuited fault, leak current fault, overload fault, electric current sharply increases in the short circuit tripping coil L3, when this electric current surpasses critical value, making iron core 2 produce the magnetic field of repelling each other with permanent magnet 19 scolds out permanent magnet 19, permanent magnet 19 drives moving contact 20 and fixed contact 21 disjunctions, and main circuit is disconnected, thereby realizes the tripping operation of auto power off.When short circuit, electric leakage, overload fault generation, because the electric current of the main circuit L utmost point sharply increases, so the secondary of current sensor L2 and zero-sequence transformer L1 also can be sensed electric leakage signal, this electric leakage signal makes main tripping coil L4 produce the magnetic field that permanent magnet 19 is scolded out by main trip circuit.From the process analysis procedure analysis of above short circuit tripping operation as can be known, the magnetic field and the permanent magnet same sex that the short circuit tripping coil is produced when exchanging positive half cycle repelled each other by (energy deenergization), and there is a natural attraction between the sexes (can magnetize to magnet) for magnetic field that is produced when exchanging negative half period and permanent magnet.
The following describes the process of overvoltage and the automatic power-off protection of high temperature.Under the state of the dynamic and static closing of contact (being energized), if main circuit in, when overvoltage occurring between phase the two poles of the earth N and the L, because the characteristic functions of piezo-resistance RV2 can make the electric current of the secondary of zero-sequence transformer L1 increase.Perhaps when the temperature rise of plug inside reaches limit value, thermoswitch KT conducting, thus the secondary current of zero-sequence transformer L1 is increased.When above-mentioned two kinds of situations make the secondary current of zero-sequence transformer L1 increase to limit value, all can be as foregoing test current, cause electric current in the main tripping coil L4 to increase and produce scold start, the magnetic force of fixed contact, thereby cut off the electricity supply.
From the analysis of the tripping operation process of above various auto power offs as seen; when faults such as the load end of the utility model plug transships, overvoltage, electric leakage, short circuit and/or the temperature of plug inside when raising; plug of the present utility model all can automatically perform the tripping operation action of deenergization rapidly; to cut off main circuit; that is the power supply of automatic disconnection plug load end, thereby realize kinds of protect functions such as overcurrent, overvoltage, electric leakage, short circuit and overheated (fire prevention) protection.
The following describes the operation principle of power indicating circuit of the present utility model.As the positive pole that the light-emitting diode D1 and the resistance R 1 of power supply indicator is serially connected in rectification circuit, form power indicating circuit.When plug was in the energized state, when promptly dynamic and static contact was in closure state, rectification circuit had electricity, made light-emitting diode D1 luminous, and the indication plug is in charged and the energized state.When plug was in the deenergization state, when promptly dynamic and static contact was in the disjunction state, no matter whether the pin of plug inserts charged supply socket, rectification circuit is dead electricity all the time, and light-emitting diode D1 does not work, with the power supply access failure of indication plug.Even particularly when but plug is in the dynamic and static contact of energized and is in closure state, if the pin of plug does not insert supply socket or inserts uncharged supply socket, then light-emitting diode D1 does not work, with not charged in the indication plug, and the power supply access failure.
To sum up embodiment is described; because the trip gear of the utility model plug only adopts a permanent magnet 19; and main tripping coil L4, short circuit tripping coil L3 and moving iron core 2 are installed on the substrate 1; rather than be installed on movable contact spring 14a, the 14b of swing as the protector of prior art; so significantly reduced heavy burden and the inertia of movable contact spring 14a, 14b; accelerate the response speed that movable contact spring 14a, 14b disjunction are moved greatly, obviously improved the sensitivity of movable contact spring 14a, 14b action.And because main tripping coil L4 and short circuit tripping coil L3 are sleeved on the outer skeleton 24 of moving iron core 2 jointly, and the electromagnetic field that it produced in the same way, institute is so that required actuating force (electromagnetic repulsion force) increasing of tripping, thereby accelerated tripping operation speed.
Describedly from above the utility model specification understandablely be; by changing the structure of above trip gear or its auxiliary circuit embodiment; can change the defencive function of plug; therefore; change the difference that realizes with described function by these, all belong to the alternative scheme of embodiment of the present utility model.
Claims (10)
1. fire-proof and electric leakage-proof safety plug; comprise control circuit board on the insulation crust that is fixed in described plug, be installed in electromagnetic tripping apparatus (100), zero-sequence transformer L1, current sensor L2, the test button K1 on the described control circuit board, a pair of static contact (22a, 22b) that corresponds respectively to center line N and phase line L and a pair of movable contact spring (14a, 14b); and the static iron core (18) on insulation crust that is fixedly mounted on described plug, it is characterized in that this plug also comprises:
Substrate (1) is made of described control circuit board one;
On described substrate (1), also install and have the reset switch assembly K of moving iron core (2), main tripping coil L4 and short circuit tripping coil L3 and skeleton (24), the described trip gear action of control and the auxiliary circuit with multiple safety protection function (200) suitable with it;
Described auxiliary circuit (200) is by anti-overheated and/or leakage protection circuit, test testing circuit and comprise that the basic circuit of main trip circuit, short circuit trip circuit and rectification circuit constitutes;
One end of described movable contact spring (14a, 14b) is fixedly mounted on the substrate (1) in the mode of elastically deformable, the free end of described movable contact spring (14a, 14b) have be arranged on substrate (1) on static contact (22a, a 22b) end on the moving contact (20) of the corresponding setting of fixed contact (21);
Insulation board (16) is fixedly installed on the center of described movable contact spring (14a, 14b), permanent magnet (19) be fixedly mounted on insulation board (16) can with the position of described static iron core (18) adhesive on, the contact force that makes described moving contact (20) and fixed contact (21) is provided by the magnetic force of elastic force that is installed in the back-moving spring (3) on the substrate (1) and described permanent magnet (19);
When plug itself take place overheated and/or the plug load end leaks electricity, when short circuit, overvoltage, over current fault, described auxiliary circuit (200) control permanent magnet (19) cooperates with moving iron core (2), movable contact spring (14a, 14b) is linked to static iron core (18) wobbling action with insulation board (16), drive described dynamic and static contact (20,21) disjunction simultaneously, thereby automatic fast shut-off power supply.
2. fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
One end of each static contact of described electromagnetic tripping apparatus (100) (22a, 22b) is respectively equipped with fixed contact (21), the other end of each static contact (22a, 22b) respectively with the main circuit input mutually, center line the two poles of the earth La, Na connect;
Fixed contact (21) is fixed on an end of static contact (22), and the other end that static contact is fixed on the substrate (1) is told phase line (the L utmost point), center line (the N utmost point).
3, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
The end that each movable contact spring of described electromagnetic tripping apparatus (100) (14a, 14b) is separately fixed on the described substrate (1) is the U-shaped structure, one end of each movable contact spring (14a, 14b) is equipped with moving contact (20), its other end respectively with main circuit mutually, center line the two poles of the earth Lc, Nc connect;
Described insulation board (16) is fixing respectively by two rivets (17) with movable contact spring (14a, 14b), so that movable contact spring (14a, 14b) can link with insulation board (16), strain by described U-shaped structure, make each movable contact spring (14a, 14b) wobbling action simultaneously, thereby disjunction/closure when realizing between two pairs of dynamic and static contacts (20,21).
4, according to claim 1 or 3 described fire-proof and electric leakage-proof safety plugs, it is characterized in that: the oscillating stroke of moving contact (20) should satisfy the requirement greater than 3mm of the creepage distance that makes between moving contact (20) and the fixed contact (21).
5, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
Described main tripping coil L4 and short circuit tripping coil L3 all are sleeved on outside the outer wall of the outer skeleton (24) of moving iron core (2) coaxially;
Described main tripping coil L4 is identical with the direction in the magnetic field that short circuit tripping coil L3 is produced under auxiliary circuit (200) control;
The direction in the magnetic field that described main tripping coil L4 and short circuit tripping coil L3 produce is opposite with the magnetic direction of permanent magnet (19).
6, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
Described reset switch assembly K is made up of the moving iron core (2), button key (4) and the back-moving spring (3) that are installed on the substrate (1);
The moving iron core (2) of described reset switch assembly K slidably is inserted in the inwall of skeleton (24);
Described back-moving spring (3) is sleeved on the moving iron core (2);
Described button key (4) is fixedlyed connected with moving iron core (2).
7, according to claim 1 or 6 described fire-proof and electric leakage-proof safety plugs, it is characterized in that:
The concentric axis body that two diameters do not wait that is shaped as of described moving iron core (2) is formed;
Described back-moving spring (3) is sleeved on the little axis body of described concentric axis body;
Described button key (4) is fixedly mounted on the place, end of the little axle of described concentric axis body;
The big or small axis body of described concentric axis body intersects and formed the shaft shoulder that stops stopping function on the interface of big axis body, makes iron core (2) be in stable state.
8, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
Described overheating protection circuit is made up of the temperature-sensitive switch KT in the main circuit that is connected in zero-sequence transformer L1 both sides, between phase line the two poles of the earth (N, L);
In the basic circuit of described auxiliary circuit (200), described rectification circuit is made up of 4 diode D1-D4;
Described main trip circuit is made up of integrated circuit (IC), controllable silicon VS, zero-sequence transformer L1, main tripping coil L4;
Described short circuit trip circuit is made up of short circuit tripping coil L3 and main trip circuit.
9, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
Described auxiliary circuit (200) can add overvoltage crowbar and/or surge protection circuit and/or current foldback circuit, and and/or power indicating circuit;
Described overvoltage crowbar is made up of the piezo-resistance RV2 in the main circuit that is connected in zero-sequence transformer L1 both sides, between phase line the two poles of the earth (N, L);
Described surge protection circuit is by the two poles of the earth that are connected in the main circuit output (Nb, Lb) the piezo-resistance RV1 between and anti-surge K switch 2 compositions;
Described current foldback circuit is made up of current sensor L2;
Described power indicating circuit is made up of light-emitting diode D1 that is connected on rectification circuit output end and resistance R 1, and when rectification circuit output end had electricity, light-emitting diode D1 was shinny, the indication power connection.
10, fire-proof and electric leakage-proof safety plug according to claim 1 is characterized in that:
The phase line L of described main circuit passes zero-sequence mutual inductance L1 and current sensor L2, forms the former limit of zero-sequence mutual inductance L1 and current sensor L2 respectively;
The center line N of described main circuit passes zero-sequence transformer L1, forms the former limit of zero-sequence transformer L1;
The secondary of zero-sequence transformer L1 and current sensor L2 is connected respectively in the basic circuit of auxiliary circuit (200);
Described short circuit tripping coil L3 is connected among the phase line L of main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201325424U CN201282245Y (en) | 2008-08-13 | 2008-08-13 | Fire-proof anticreepage protective plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201325424U CN201282245Y (en) | 2008-08-13 | 2008-08-13 | Fire-proof anticreepage protective plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201282245Y true CN201282245Y (en) | 2009-07-29 |
Family
ID=40929111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201325424U Expired - Lifetime CN201282245Y (en) | 2008-08-13 | 2008-08-13 | Fire-proof anticreepage protective plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201282245Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651272B (en) * | 2008-08-13 | 2011-08-03 | 浙江正泰建筑电器有限公司 | Fire-proof and electric leakage-proof safety plug |
| CN102231462A (en) * | 2011-04-19 | 2011-11-02 | 刘睿刚 | Leakage protection plug |
| CN104600515A (en) * | 2015-03-02 | 2015-05-06 | 潘阿海 | Electromagnetic-type automatic-power-off plug |
| CN105244712A (en) * | 2014-07-10 | 2016-01-13 | 廖生兴 | Connecting wire device with overheating protection function and adaptor structure |
| CN107863280A (en) * | 2017-11-21 | 2018-03-30 | 胡琳 | A kind of electronic equipment with break protecting |
| CN109462094A (en) * | 2018-10-30 | 2019-03-12 | 阮鑫 | A kind of television set anti-leakage plug |
| CN110739589A (en) * | 2018-07-21 | 2020-01-31 | 佛山市顺德区信辉达电子有限公司 | Intelligent leakage protection plug with leakage protection function failure re-protection function |
-
2008
- 2008-08-13 CN CNU2008201325424U patent/CN201282245Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651272B (en) * | 2008-08-13 | 2011-08-03 | 浙江正泰建筑电器有限公司 | Fire-proof and electric leakage-proof safety plug |
| CN102231462A (en) * | 2011-04-19 | 2011-11-02 | 刘睿刚 | Leakage protection plug |
| CN105244712A (en) * | 2014-07-10 | 2016-01-13 | 廖生兴 | Connecting wire device with overheating protection function and adaptor structure |
| CN104600515A (en) * | 2015-03-02 | 2015-05-06 | 潘阿海 | Electromagnetic-type automatic-power-off plug |
| CN107863280A (en) * | 2017-11-21 | 2018-03-30 | 胡琳 | A kind of electronic equipment with break protecting |
| CN110739589A (en) * | 2018-07-21 | 2020-01-31 | 佛山市顺德区信辉达电子有限公司 | Intelligent leakage protection plug with leakage protection function failure re-protection function |
| CN109462094A (en) * | 2018-10-30 | 2019-03-12 | 阮鑫 | A kind of television set anti-leakage plug |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090729 Effective date of abandoning: 20080813 |