CN2785111Y - Zero pressure continuous limit stream eliminating arc appliance equipment - Google Patents
Zero pressure continuous limit stream eliminating arc appliance equipment Download PDFInfo
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- CN2785111Y CN2785111Y CN 200520096304 CN200520096304U CN2785111Y CN 2785111 Y CN2785111 Y CN 2785111Y CN 200520096304 CN200520096304 CN 200520096304 CN 200520096304 U CN200520096304 U CN 200520096304U CN 2785111 Y CN2785111 Y CN 2785111Y
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Abstract
The utility model relates to a zero pressure continuous limit stream eliminating arc appliance device with no arc or a micro arc. The utility model comprises a switch contact. The utility model is characterized in that the utility model also comprises a reactor; the switch contact comprises a moving contact and a static contact; one end of the reactor is connected with the moving contact, and the other end is connected with the static contact. The zero pressure bypass continuous limit stream eliminating arc appliance device of the utility model can fundamentally generate no electric arc to cut off a power supply of a working circuit. The utility model leads the 'arc extinguishing switch off' mode to be changed into the 'arc eliminating switch off' mode. The utility model is a novel switch appliance. The utility model has the advantages of stabilization and reliability existing in the mechanical structure of a traditional switch appliance, and has the characteristic that the utility model is switched off with no arc, and the traditional switch appliance has not the characteristic. Therefore, reliable technical performances can be ensured, and the utility model is a novel switch appliance.
Description
Technical field:
The utility model relates to that a kind of to exchange under the condition with no-voltage and the continuous current-limiting method cancellation electric arc of bypass be the device for switching device of feature.
Background technology:
The effect of device for switching is to open or turn-off operating circuit, the subject matter that electric arc that produces when breaking circuit and arc extinction face when being device for switching work, capacity more then arc extinguishing is more difficult, so extinguish arcs is the center and the key point of device for switching technical problem.Existing device for switching is conceived to " arc extinguishing ", just when the device for switching breaking circuit produces electric arc, manages to be extinguished.The best opportunity of arc extinguishing is that device for switching is turn-offed in alternating current circuit, and the operating frequency of electrical network is generally 50HZ or 60HZ, and just electric current is wanted zero passage 100 times or 120 times in each second.Because the time of current over-zero, extremely of short duration wanting was difficult to accomplish in this instantaneous realization shutoff just, if will for example in ± 10 ° of (electrical degree) scopes, think to be fit to the angle of shutoff near the current zero-crossing point, so in 180 ° of scopes of current waveform half period during a zero passage, have only ± 10 °, promptly 20 ° scope is fit to turn-off.Under the frequency of 50HZ, the precision of device for switching turn-off time will reach and multiply by 20/180 again and again percent of a second, multiply by 1/9, and is approximately 0.001 second in promptly 0.01 second.Because the operating mechanism of device for switching is a mechanical mechanism, and certain discreteness and distributivity are arranged in material, technology, the manufacturing, make the requirement that its, precision reached signa operate time is impossible basically.
Therefore, present basic contradiction is: though the detection speed of electronic technology is very fast, precision is very high, can measure the zero crossing of electric current in the circuit rapidly and fed back, but mechanical motion mechanism can't move at zero crossing exactly, there is deviation just might near current peak, turn-off slightly, produces very big electric arc and make quite difficulty of arc extinguishing.For using wider three-phase alternating current device for switching than single phase alternating current (A.C.) device for switching, the phase sequence of three-phase alternating current differs 120 °, and zero passage is brought bigger difficulty to arc extinguishing simultaneously.
Power electronic device development at present is very fast, though it can reach requirement on the speed that detects and turn-off, but the element power consumption is big during owing to circuit debugging, especially during high-voltage large current, power consumption, heat dissipation problem are given prominence to, and exist cost height, reliability not as deficiencies such as conventional switch electrical equipment, so can't replace conventional switch electrical equipment.
In sum, the main points of alternating-current switch electrical work are breaking circuits reliably in current over-zero, and existing alternating-current switch electrical equipment is not because its arc quenching effect of above-mentioned a variety of causes is attained ideal.
Summary of the invention:
The purpose of this utility model is to overcome existing device for switching produces electric arc when open and close defective, and a kind of continuous current-limiting arc-extinguishing electrical installation of zero-pressure that does not have the arc or the differential of the arc is provided.
The technical solution of the utility model is as follows: it comprises contact switch, it is characterized in that: it also comprises reactance, and contact switch comprises moving contact and fixed contact; One end of reactance is connected with moving contact, and the other end is connected with fixed contact.
The utility model device, no-voltage, bypass just continues the current-limiting arc-extinguishing electrical installation, and it can cut off the power supply of operating circuit under the situation that does not produce electric arc substantially.
Basic principle of the present utility model is: it is to be carried out by the contact that device for switching turns on and off circuit, when open the contact, as long as the voltage and current in the circuit reaches certain numerical value, will produce electric arc between the contact.The basic reason that produces electric arc is high electric field transmitted, and the method for no-voltage is exactly that to make two instantaneous voltages between the contact when opening in the contact be zero, thereby cancels the condition of high electric field transmitted.The continuous current limliting of bypass makes electric current pass through (afterflow) from bypass when opening in the contact exactly, drawing away electric current can not form electric arc, bypass circuit has big reactance to be played metering function and makes electric current be reduced to the degree that does not produce electric arc rapidly, turn-offs bypass circuit by auxiliary contact again.
The utility model is used the principle of " no-voltage+bypass extinguishing arc; big reactance current limliting ", when breaking circuit with the electric arc of the method cancellation main contacts point-to-point transmission of no-voltage and bypass afterflow, with the freewheel current of big resistance limits, so just reached the purpose of " extinguishing arc disjunction " by auxiliary main contacts.Owing to do not need to seek the instantaneous zero crossing of electric current of per second 100 times,, just can reach calm and the effective purpose of breaking circuit so the mechanical action time precision of device for switching can not done specific (special) requirements.
Than existing alternating-current switch electrical installation, the utility model has overcome and has been difficult to the shortcoming holding and control because of the instantaneous zero crossing of the electric current time is too short, and become " arc extinguishing shutoff " and be " extinguishing arc shutoff ", be the device for switching on a kind of brand-new meaning.It had both kept the reliable and stable advantage of conventional switch electrical machinery structure, possessed the characteristics that no arc that conventional switch electrical equipment do not had turn-offs again, therefore can guarantee the reliable technique performance, significantly improve the useful life of product, be a kind of device for switching of novelty.
Description of drawings:
Fig. 1 is the basic structure schematic diagram of existing contact switch, contact structure schematic diagram when wherein (a) is closed, the structural representation when (b) opening for the contact.
Fig. 2 is a kind of structural representation of the present utility model.
Fig. 3 is big reactance Z in the utility model device
kTwo kinds of versions, wherein (a) reactance, (b) reactance for constituting by capacitor C and inductance L parallel connection for constituting by electric capacity.
Fig. 4 is three-phase main contacts and afterflow reactance, auxiliary main contacts circuit diagram.
Current direction figure when Fig. 5 connects for main contacts in the utility model device and auxiliary main contacts.
Fig. 6 is electric current and the voltage the during disjunction of main contacts elder generation in the utility model device.
The freewheel current tendency chart that Fig. 7 has no progeny for main contacts branch in the utility model device.
Fig. 8 is in the utility model device behind the auxiliary main contacts during disjunction, the schematic diagram that cuts off very little freewheel current.
Fig. 9 is the circuit structure diagram of circuit outside device for switching that reactor and auxiliary main contacts are formed.
The structural representation of Figure 10 mediator and auxiliary equipment thereof.
The structural relation figure of Figure 11 mediator and reactor, fixed contact.
Figure 12 mediator and contact structure graph of a relation.
Structural representation during Figure 13 closing of contact, wherein (a) is that front view, (b) are end view.
Structural representation when Figure 14 opens the contact, wherein (a) is that front view, (b) are end view.
Label declaration: D is a moving contact, and J is a fixed contact, C
dBe the contact of closure, KM
A, KM
B, KM
CBe main contacts, KM
a, KM
b, KM
cBe auxiliary contact Z
K, Z
Ka, Z
Kb, Z
KcBe reactance, L is an inductor, and C is a capacitor, Z
LBe load impedance, i
A, i
B, i
CBe three-phase current, U
CA, U
CB, U
CCBe capacitance terminal voltage, T is an elastic body, and ZJ is a mediator, and JY is an insulator, and LJ is an electrical connection arrangement, and the contact base is DZ,
Embodiment:
Basic structure is introduced: as shown in Figure 1, contact structure schematic diagram when Fig. 1 (a) is closed, D is a moving contact, and J is a fixed contact, and the promptly closed contact of middle thick horizontal line is with C
dExpression.The structural representation of Fig. 1 (b) when opening for the contact.
As shown in Figure 2, the utility model is to connect big reactance Z between moving contact that has switch contact now and fixed contact
K, when moving contact D when the opposite direction of fixed contact J is opened, two contacts become separately from closure, the instantaneous voltage between two contacts is a no-voltage, electric current is from big reactance Z simultaneously
KBypass is passed through.
Fig. 3 is big reactance Z
KTwo kinds of forms of the composition, Fig. 3 (a) is the big reactance that is made of capacitor C, Fig. 3 (b) is the big reactance that is made of capacitor C and inductance L parallel connection, in subsequent figure with reactance Z
KUnified these two kinds of constituted modes of expression.
Below in conjunction with drawings and Examples the utility model is specifically described.
Embodiment 1:
As Fig. 4 is the circuit diagram of the enforcement structure of three-phase main contacts and afterflow reactance, auxiliary main contacts.
Voltage, map of current when Fig. 5 connects (device for switching is in opening state) for main contacts and auxiliary main contacts.At this moment because main contacts is connected, and electric current flows through from main contacts, and the afterflow reactance, auxiliary main contacts circuit has big reactance to exist does not have electric current to pass through, and is equivalent to by main contacts " short circuit ", and the electric capacity both end voltage is zero.
Electric current and voltage during Fig. 6 device for switching main contacts elder generation disjunction.At this moment electric current flows through from afterflow reactance, auxiliary main contacts circuit afterflow.
The freewheel current that Fig. 7 device for switching main contacts branch is had no progeny has been suppressed to very little degree.
Behind the auxiliary main contacts of Fig. 8 during disjunction, the schematic diagram that cuts off very little freewheel current.
In the accompanying drawings: with contactor KM is that example is represented general device for switching, KM among the figure
A, KM
B, KM
CWhat indicate is the three-phase main contacts of contactor, KM
a, KM
b, KM
cWhat indicate is the auxiliary main contacts of three-phase of contactor, and L is an inductor, and C is a capacitor, Z
LBe load impedance, i
A, i
B, i
CBe three-phase current, U
CA, U
CB, U
CCBe capacitance terminal voltage.
Circuit as shown in Figure 4 comprises the main contacts and the auxiliary main contacts of device for switching, reactor.Wherein the excess of stroke of main contacts and auxiliary main contacts is different, and the excess of stroke of auxiliary main contacts is bigger, so it opens more late than main contacts.Reactor can be made of separately capacitor, also can be composed in parallel by inductor and capacitor.When device for switching was connected circuit, the circuit of being made up of reactor and auxiliary main contacts was not had electric current to pass through by main contacts " short circuit ", and the current potential at capacitor two ends is equal, promptly is " same point ", so the terminal voltage of capacitor equals zero, is " zero potential ".When device for switching is opened, the disjunction of main contacts elder generation, the excess of stroke of auxiliary main contacts than die after disjunction, electric current passes through in the circuit bypass afterflow that this moment is formed from reactor and auxiliary main contacts.When the disjunction of main contacts elder generation, because the electric capacity both end voltage can not be suddenlyd change, so opening moment, the main contacts point-to-point transmission is a no-voltage, and this has just cancelled the condition of arcing.On the other hand, electric current is during from circuit " bypass " afterflow that reactor and auxiliary main contacts are formed, and the impedance of this circuit is more much smaller than air dielectric, has therefore drawn away electric current and has made main contacts can not produce electric arc when minute deenergizing.The reactance of reactor is very big, and its metering function is very remarkable, so the bypass freewheel current is limited in a very little numerical value at once, also can not produce electric arc when auxiliary main contacts is opened subsequently.So device for switching of the present utility model belongs to no arc or basic non-arc breaking is disconnected, electrical equipment can be worked under this condition reliably and with long-term.
By the reactor that inductor and capacitor compose in parallel, the induction reactance value of its inductor and the capacitor value of capacitor are basic identical, but opposite in sign.The calculating formula of reactor reactance is:
Z＝Z
LZ
C/(Z
L-Z
C)
Z wherein
LBe R
L+ ω L, Z
CBe R
C+ ω C, because ω L ≈ ω C, i.e. Z
L≈ Z
CSo the denominator of Z is very little, and molecule Z
LZ
CVery big, the reactance Z of visible reactor is very big.
The reactor that is composed in parallel by inductor and capacitor has a significant advantage when work, can make exactly circuit energy within it portion present absorption, can not have a negative impact to contact branch deenergizing.
The course of work:
1, closure: when the device for switching coil gets when electric, as shown in Figure 5, this moment, electric current was from main contacts KM
A, KM
B, KM
CBy, the circuit of being made up of reactor and auxiliary main contacts is not had electric current to pass through by main contacts " short circuit ".The current potential at capacitor two ends equates, promptly is " same point ", so the terminal voltage of capacitor equals zero, is " zero potential ".
2, open: when the device for switching coil losing electricity, main contacts is opened earlier, as shown in Figure 6, electric current is from circuit " bypass " afterflow of reactor and auxiliary main contacts composition at this moment, simultaneously because the electric capacity both end voltage can not suddenly change, so be no-voltage at the dynamic and static contact point-to-point transmission of opening the moment main contacts; Originally the operating current by main contacts has bypass afterflow passage on the one hand, is limited by no-voltage again on the other hand, so there is not the condition of arcing.
When behind auxiliary main contacts, opening, as shown in Figure 4, because the reactance of reactor is very big, therefore freewheel current has been limited in a very little numerical value, so can not produce electric arc, belong to no arc or differential of the arc disjunction, electrical equipment can be worked under this condition reliably and with long-term.
Embodiment 2:
As shown in Figure 9, by reactor Z
KaThe circuit of forming with auxiliary main contacts KMa is outside device for switching, therefore can not increase the improvement that is used under the overall dimension condition of existing product existing product, also it can be replaced existing arc-control device and and the device for switching main part lump together the formation new product.When auxiliary main contacts and main contacts separate, no longer by a coil control, but by two coils controls.The control coil of auxiliary main contacts is positioned on the major loop, and when main contacts disjunction major loop, so the control coil dead electricity of auxiliary main contacts is auxiliary main contacts KM
aOpen, this has just guaranteed that main contacts opens the order of work that auxiliary main contacts is opened subsequently earlier thereupon.When main contacts was closed, the control coil of auxiliary main contacts got electric, and auxiliary main contacts is closed thereupon, but because of the big reactance of connecting by main contacts " short circuit ", so wherein no current passes through.
Embodiment 3:
As Figure 10, shown in Figure 11, T is an elastic body, and ZJ is a mediator, and JY is an insulator, and LJ is an electrical connection arrangement, and the contact base is DZ.
Embodiment constructs explanation:
As shown in figure 10, mediator ZJ and auxiliary equipment thereof be by the mediator ZJ of conduction, and elastic body T and the insulator JY that plays fixing, separation, position-limiting action form.Elastic body T is positioned at the cavity of insulator JY, and the two ends of mediator ZJ are supported on respectively on the elastic body T who is positioned at insulator JY cavity; Mediator ZJ has two positions, when contact closure, mediator ZJ under the effect of elastic body T in the lower limit position, in the centre of dynamic and static contact D, J, can be referring to Figure 13; When contact was opened, mediator ZJ returned to the upper limit position under the elastic force effect of elastic body T, did not all contact with dynamic and static contact D, J, can be referring to Figure 14.Mediator ZJ and reactor Z
K, fixed contact J relation as shown in figure 11, meet reactor Z between mediator ZJ and the fixed contact J
K, mediator ZJ and fixed contact J stick together when contact closure, reactor Z
KIn the capacitor two ends become " same point "; The capacitor two ends separately when contact is opened.Mediator ZJ and contact J graph of a relation as shown in figure 12, the position of contact J is in mediator ZJ central authorities, mediator ZJ can be clipped in the middle mediator ZJ by dynamic and static contact D, J between the centre of dynamic and static contact D, J; Also can leave the size hole identical with respect to the position of contact at mediator ZJ with the contact, the closure that does not influence dynamic and static contact with contact, but mediator moves with the action of moving contact base.The electrical connection arrangement of reactor and mediator has various ways, can be that conduction flexible cord or other can guarantee the structure of conducting electricity and moving freely.
The course of work:
1, closure: when the device for switching coil gets when electric, the dynamic and static closing of contact is clamped mediator or is all contacted with mediator, be connected the capacitor quilt " short circuit " between mediator and the fixed contact this moment, the current potential at two ends equates, promptly be " same point ", so the terminal voltage of capacitor equals zero, be " zero potential ".
2, open: when the device for switching coil losing electricity, moving contact takeoffs, elastic body is upspring mediator, this moment, two end points of electric capacity began to separate, because the electric capacity both end voltage can not be suddenlyd change, so opening moment, mediator and fixed contact point-to-point transmission are no-voltage, and this has just cancelled the condition of arcing.In the moment that moving contact and mediator do not separate as yet fully, the circuit flow mistake that electric current may constitute through reactor, fixed contact, but,, can not produce electric arc so electric current is limited in a very little numerical value at once because of reactance is very big.
Claims (4)
1, the continuous current-limiting arc-extinguishing electrical installation of a kind of zero-pressure, it comprises switch contact, it is characterized in that: it also comprises reactance, switch contact comprises moving contact and fixed contact; One end of reactance is connected with moving contact, and the other end is connected with fixed contact.
2, the continuous current-limiting arc-extinguishing electrical installation of zero-pressure according to claim 1, it is characterized in that: contact switch comprises compound main contacts and reactor, compound main contacts is made up of dynamic and static contact and mediator and auxiliary equipment thereof, dynamic and static contact is serially connected in the main circuit, one end and power supply link, and receive the power supply other end behind the other end process load impedance ZL; Mediator and auxiliary equipment thereof be by the mediator of conduction, elastic body and fixing, separation is arranged and the insulator of position limiting structure is formed, and reactor is connected between mediator and the fixed contact.
3, the continuous current-limiting arc-extinguishing electrical installation of zero-pressure according to claim 2, it is characterized in that: reactor is made of capacitor.
4, the continuous current-limiting arc-extinguishing electrical installation of zero-pressure according to claim 2, it is characterized in that: reactor is composed in parallel by capacitor and inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520096304 CN2785111Y (en) | 2005-05-09 | 2005-05-09 | Zero pressure continuous limit stream eliminating arc appliance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520096304 CN2785111Y (en) | 2005-05-09 | 2005-05-09 | Zero pressure continuous limit stream eliminating arc appliance equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2785111Y true CN2785111Y (en) | 2006-05-31 |
Family
ID=36772076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520096304 Expired - Fee Related CN2785111Y (en) | 2005-05-09 | 2005-05-09 | Zero pressure continuous limit stream eliminating arc appliance equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2785111Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888045A (en) * | 2010-06-02 | 2010-11-17 | 江苏艾索新能源股份有限公司 | Circuit and method for preventing direct current arc discharge |
| CN101895028A (en) * | 2010-06-02 | 2010-11-24 | 江苏艾索新能源股份有限公司 | Anti-direct current arc discharge circuit |
| CN103078627B (en) * | 2011-10-26 | 2016-01-20 | 李尔公司 | Limit switch interface circuit |
-
2005
- 2005-05-09 CN CN 200520096304 patent/CN2785111Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888045A (en) * | 2010-06-02 | 2010-11-17 | 江苏艾索新能源股份有限公司 | Circuit and method for preventing direct current arc discharge |
| CN101895028A (en) * | 2010-06-02 | 2010-11-24 | 江苏艾索新能源股份有限公司 | Anti-direct current arc discharge circuit |
| CN103078627B (en) * | 2011-10-26 | 2016-01-20 | 李尔公司 | Limit switch interface circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060531 |