CN102938354B - Contact and arc extinction system of mold case circuit breaker - Google Patents
Contact and arc extinction system of mold case circuit breaker Download PDFInfo
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- CN102938354B CN102938354B CN201210461887.5A CN201210461887A CN102938354B CN 102938354 B CN102938354 B CN 102938354B CN 201210461887 A CN201210461887 A CN 201210461887A CN 102938354 B CN102938354 B CN 102938354B
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Abstract
The invention relates to a contact and arc extinction system of a mold case circuit breaker. The system comprises an arc extinction gate slice group, a static conducting rod, a movable conducting rod, a movable conducting rod support, a movable conducting rod insulation sleeve and a multifunction insulation plugging piece. The front end of the multifunction insulation plugging piece covers a leg portion of the arc extinction gate slice group, and the rear end of the multifunction insulation plugging piece is an arc platform; the movable conducting rod insulation sleeve covers two side surfaces and the lower portion of the movable conducting rod, only a movable contact of the movable conducting rod is exposed, and the rear end of the movable conducting rod insulation sleeve is provided with an arc wing panel; the lower end of the movable conducting rod support is an arc portion which is matched with the arc platform at the rear end of the multifunction insulation plugging piece, and hot current generated in the breaking process can be prevented from diffusing towards the rear area of the breaker through a gap below the movable conducting rod support; and a slot is opened at the lower end of the movable conducting rod support, and when the movable conducting rod is detached, the arc wing panel of the movable conducting rod insulation sleeve can slide on the movable conducting rod to seal an opening between the movable conducting rod and the movable conducting rod support. According to the contact and arc extinction system, rear air current is sealed, air-blowing functions on an electric arc are enhanced, and breaking performances of the mold case circuit breaker are improved.
Description
[technical field]
The present invention relates to breaker technical field, particularly a kind of low-pressure plastic shell circuit breaker, the slipstream that it can prevent interrupting process electric arc from producing, strengthen gas blast arc-quenching, improve the break performance of circuit breaker.
[background technology]
Breaker of plastic casing is a kind of low-voltage circuit breaker of current-limiting type, in industrial low-voltage power distribution system and motor or other power consumption equipment circuit.In such systems, breaker of plastic casing can guarantee switching on and off under the nominal load required by various user, automatic shutoff circuit (such as overload and short circuit) under any abnormality, and make the complete and isolated from power of load by being separated by dynamic and static contact.
It is the electrodynamic repulsion force relying on contact loop to produce at short circuit current that the current limliting of breaker of plastic casing disjunction short circuit current cut-offs function, make, fixed contact is before operating mechanism action, scold out in advance and be separated, after contact system is separated, be added in dynamic, voltage between fixed contact causes air dielectric discharge and form electric arc, electric arc is under magnetic field and airflow field drive, enter grating arc-extinguishing chamber, the grating arc-extinguishing chamber of circuit breaker is made up of multi-disc iron railings sheet, after electric arc enters grating arc-extinguishing chamber, be divided into a series of short electric arc, rely on the proximal pole pressure drop of each short electric arc, total arc voltage is made significantly to increase, supply voltage is executed outside arc voltage exceedes, the rising of electric current is pressed, electric current reduces to zero under the effect of arc voltage, and make electric arc in power supply blow-out before prerequisite.The power driving electric arc to enter grid from the magnetic blow-out of above-mentioned blow-out process and air-blowing.Magnetic blow-out relies on the magnetic field that produced by electric current, contact galvanic circle to be formed, and air-blowing makes arc suppression chamber pressure increase due to the high temperature of electric arc, cause arc control device and extraneous mineralization pressure poor and produce.Traditional circuit breaker, except arc control device front end has venthole, and its rear end is and mechanism, release and rear binding post are connected and also have gas channel, thus interrupting process arc suppression chamber pressure forms forward and backward two strands of air-flows, forward air flow promotes electric arc and moves forward into arc control device, and slipstream can stop electric arc to travel forward, and slipstream can be transmitted to rear metallic particles and high temperature free gas, make operating mechanism akinesia because metallic particles blocks, free gas with metallic vapour is transmitted to rear, also circuit breaker insulation property can be affected, thus how eliminating and weakening interrupting process slipstream is the key improving circuit breaker break performance.
[summary of the invention]
The object of the present invention is to provide a kind of breaker of plastic casing contact and arc quenching system, effectively can seal slipstream.
For achieving the above object, the present invention is achieved by the following technical solutions.
A kind of breaker of plastic casing contact and arc quenching system, comprising: the arc extinguishing grid pieces group of multi-disc iron railings sheet composition; Be fixed on the fixed contact on static conductive rod; Be fixed on the moving contact on moving conductive rod; The moving conductive rod support of device moving conductive rod; With the moving conductive rod insulating case of arcuated fin piece; Multifunction insulating plug-in unit; Multifunction insulating plug-in unit front end encases the leg of arc extinguishing grid pieces group, and rear end is an arc platform; Moving conductive rod is equipped with insulating case, and moving conductive rod insulating case front end encases moving conductive rod two sides and bottom, only exposes moving contact, and rear end is with an arcuated fin piece; Moving conductive rod pedestal lower end is the curved portions matched with the arc platform of insulative inserts rear end, due to both closely cooperating, can prevent the thermal current of interrupting process from being spread to circuit breaker rear area by the space below moving conductive rod support, moving conductive rod pedestal lower end also has a groove, when moving conductive rod is scolded out with moving contact, the arcuated fin piece of insulating case can slide thereon, seal the opening that moving conductive rod and moving conductive rod support occur, prevent thermal current from being leaked backward by moving conductive rod support cavity.
The arc platform of multifunction insulating insert rear end and the curved portions tolerance fit of moving conductive rod pedestal lower end; The arcuated fin piece of moving conductive rod insulating case and the groove tolerance fit of moving conductive rod pedestal lower end.
Multifunction insulating plug-in unit is made by insulating material, its both sides, front end form the flash barrier encasing arc extinguishing grid pieces group both sides leg inner surface, when circuit breaker cut-offs, move in the gap that moving contact is formed in the middle of flash barrier, the electric arc that contact produces makes electric arc can not directly corrode arc extinguishing grid pieces group leg and produce metallic vapour due to flash barrier effect, affect break performance; Narrow gap makes electric arc be squeezed on the other hand, is conducive to blow-out.
Gap between the arc platform of insulative inserts rear end and the curved portions of moving conductive rod pedestal lower end is very little, and slipstream can be stoped to flow to arc control device rear.
Multifunction insulating plug-in unit by insulate are-tight gas exhausted material or not gas exhausted material be made.
Insulating case by insulate are-tight gas exhausted material or not gas exhausted material be made.
Relative to prior art, the present invention has the following advantages: the present invention not only has the effect of closed rear air-flow; And and multifunction insulating plug-in unit first part can shield grid group leg, reduce metallic vapour And and have narrow slit suppression to electric arc, the insulating case upper end that moving conductive rod insulating material makes can limit electric arc and stretch backward along moving conductive rod, if make of gas exhausted material, then after arc erosion, produce hydrogeneous gas, can cool and suppress electric arc, comprehensively these effects, adopting the present invention can increase substantially the current limliting break performance of breaker of plastic casing.
[accompanying drawing explanation]
Fig. 1 is breaker of plastic casing structural representation of the present invention.
Fig. 2 is three-phase moving conductive rod support schematic diagram.
Fig. 3 is the assembling schematic diagram of moving conductive rod and moving conductive rod support, and wherein 3a is graphics; 3b is the front view of Fig. 3 a; Fig. 3 c is the profile along A-A line in Fig. 3 b.
Fig. 4 is the structure chart of multifunction insulating plug-in unit.
Fig. 5 is the moving conductive rod insulating case schematic diagram of band circular arc fin, and wherein 5a is graphics; 5b is the installation diagram of Dao electricity Defend and insulating case.
Fig. 6 is the part assembling drawing of front apron of moving conductive rod, multifunction insulating plug-in unit, moving conductive rod support, arc extinguishing grid pieces group and band gas outlet.
Fig. 7 is arc extinguishing grid pieces, and wherein 8a is arc cutting part, becomes short electric arc in order to arc cutting; 8b is grid leg, in order to increase magnetic field, contact district.
Fig. 8 is the model arc control device doing contrast test.Wherein Fig. 8 a is narrow slit structure; Fig. 8 b is stop block structure; Fig. 8 c is the cross-sectional schematic of Fig. 8 a.
Fig. 9 is arc voltage and the current waveform of model arc control device result of the test.Wherein Fig. 9 a is narrow slit structure; Fig. 9 b is stop block structure.
In accompanying drawing, symbol represents respectively: 1, circuit breaker operating handle; 2, operating mechanism; 3, moving conductive rod support; 4, moving conductive rod; 5, moving conductive rod insulating case; 6, multifunction insulating plug-in unit; 7, static conductive rod; 8, arc extinguishing grid pieces; 9, terminals; 10, terminals; 11, release; The front apron of 12 band gas outlets; 13 moving contacts.In Fig. 8 a and Fig. 8 c, 101 is housing; 102 is arc extinguishing grid pieces group; 103 is baffle plate of giving vent to anger; 104 is static conductive rod binding post; 105 is fixed contact; 106 is moving conductive rod; 107 for turning uranium; 108 is fixing pin; 109 is soft strength; 1010 is moving conductive rod lead-out wire binding post; 1011 is longitudinal convex; 1012 is block; 1013 is convex.
[embodiment]
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 1 and Fig. 3 a, the present invention is used for contact and the arc quenching system of low-pressure plastic shell circuit breaker, in figure, moving contact 13 is fixed on moving conductive rod 4, it has with the fixed contact (Tu Zhong No be fixed on static conductive rod 7 draws) constitute the contact system of circuit breaker, moving conductive rod support 3 is rotating shafts of moving contact and moving conductive rod, it can rotate under operating mechanism 2 drives, realize separating brake and the combined floodgate of circuit breaker, on moving conductive rod 4, cover has the insulating case 5 that the insulating material of band circular arc fin makes, in arc control device, multi-disc iron railings sheet 8 forms arc extinguishing grid pieces group, when electric arc is under magnetic blow-out and air-blowing effect, when entering arc extinguishing grid pieces group, the short electric arc of multistage is become for subdividing the arc, arc voltage is made to raise and realize current limliting and cut-off, the multifunction insulating plug-in unit 6 made by insulating material and insulating case 5 match with moving conductive rod support and work to stop air-flow behind in the present invention.In Fig. 1,1 is operating grip, and 9 and 10 is leading-out terminal, and 11 is release, and 12 is the front apron being with gas outlet.Moving contact rack 3 inside is a cavity 3d, as shown in Figure 2, moving conductive rod 4 inserts into the inner (Fig. 3 a), Fig. 3 c is its profile, dynamic conductance bar 4 and support 3 are flexible fastening, when breaker closing, touch spring provides contact pressure by rotating shaft 3g, when short circuit current passes through, before operating mechanism not yet drives moving contact rack 3 to rotate, under the electrodynamic repulsion force effect that the moving contact closed with fixed contact produces at short circuit current, overcome spring pressure, moving conductive rod 4 is counterclockwise rotated around axle 3g, and contact is scolded out, lower block 3f on moving contact rack 3 is as the lower limit of moving conductive rod 4, upper block 3e is upper limit when scolding out as moving conductive rod 4, when moving contact 13 is scolded out, an opening is there is between moving conductive rod 4 and moving contact rack 3.
When circuit breaker cut-offs short circuit current, the electric arc that contact presents, the high temperature due to it causes arc control device internal pressure suddenly to increase, and arc control device external and internal pressure can form two strands of outside air-flows.One is gas outlet 12 forwards, contributes to driving electric arc to enter arc control device, and one not only can stop arc motion, and free gas diffuses to rear to arc control device rear, can affect the medium recovery after arc current zero passage.In order to stop rear air-flow, the present invention proposes a kind of multifunction insulating plug-in unit 6 made by insulating material, as shown in Figure 4, this insulative inserts 6 front end is two flat boards of band certain interval, between the both sides leg being inserted in arc extinguishing grid pieces group, form the flash barrier of leg, flash barrier encases the both sides leg of the arc extinguishing grid pieces group that arc extinguishing grid pieces 8 forms, a narrow slit 6c that can allow moving contact and moving conductive rod activity is formed between two flash barrier 6b, its effect prevents arc erosion grid leg and produces the metallic vapour being unfavorable for blow-out on the one hand, narrow slit can allow electric arc be squeezed on the other hand, help blow-out, multifunction insulating plug-in unit 6 rear forms an arc platform 6a, the arcwall face 3b(that this arc platform 6a and moving conductive rod support 3 lower end are formed is shown in Fig. 2) just in time coordinate, form a small gap (see Fig. 6) that moving conductive rod support 3 only can be allowed to rotate, stop slipstream.Prevent another measure of slipstream; that on moving conductive rod 4, cover has the insulating case 5 (see Fig. 5) be made up of insulating material; there is an arcuated fin piece 5a at the rear portion of insulating case 5; after the moving conductive rod 4 of fixing moving contact is scolded out in interrupting process; the opening occurred between moving conductive rod 4 and moving conductive rod support 3 can be sealed; thermal current is backward stoped to enter rear by the cavity of moving conductive rod support 3, and the touch spring of protection setting in cavity (see Fig. 3 c).When moving contact is scolded out, fin 5a slides (see Fig. 2) in the groove 3c of support 3 bottom, and its surface is mutually smooth with the curved surface of pedestal lower end, to keep the small―gap suture between support and multi-functional plug-in unit.The previous section 5b of insulating case 5 entangles two sides and the bottom of moving conductive rod 4, only expose moving contact 13, on moving contact, prolong moving conductive rod to prevent electric arc to extend back, insulating case 5 can with rivet passing hole 5c and moving conductive rod 4 fixing (see Fig. 5 b), and Fig. 6 is the part assembling drawing of front apron of moving conductive rod, multifunction insulating plug-in unit, moving conductive rod support, arc extinguishing grid pieces group and band gas outlet; Multifunction insulating plug-in unit 6 previous section covers arc extinguishing grid pieces 8 leg 8b (see Fig. 7) as can be seen from Figure 6, the close-fitting situation of aft section arc platform and moving conductive rod support 3 bottom.
The moving conductive rod insulating case 5 of multifunction insulating plug-in unit 6 and band arcuated fin piece of are-tight aerogenesis and not gas exhausted material making, can make of gas exhausted material and can strengthen the effect of air-borne fungi air stream drives, but can increase arc suppression chamber pressure, require that shell has sufficient intensity.
In order to verify the effect sealing rear air-flow, two kinds of single-break arc control device model structures are designed and produced as Fig. 8 (a) (b), its operation principle is scolded by electrodynamic repulsion force and is started contact, pin moving conductive rod by fixing pin 108 when moving contact is scolded and reached maximum position, make moving contact be held in most large opening.Mode shape size 90 × 130 × 50(unit: mm), arc control device are of a size of 50 × 50 × 30(unit: mm), its middle shell 101 and block 1012 are unsaturated polyester (UP) mold materials (DMC), dynamic and static conducting rod and be flexible coupling and 109 be copper product, dynamic and static contact material is respectively AgC and AgW, grid 102 is ferromagnetic materials surface nickel plating, and model is equipped with 12 grid submits wrong structure, and rotating shaft 107 and fixing pin 108 are Steel material.In Fig. 8 a and Fig. 8 c, 103 is baffle plate of giving vent to anger; 104 is static conductive rod binding post; 1010 is moving conductive rod lead-out wire binding post.
The feature of two kinds of structure arc control device is: the narrow slit structure that Fig. 8 (a) provides has longitudinal convex 1011 of 25mm below arc control device, as shown in cross section.Convex gap, both sides is that 5mm is as moving conductive rod movement clearance, moving conductive rod thickness is 3mm, the middle slit formed by both sides convex, can ensure that the moving conductive rod 106 of fixing moving contact can freely rotate in slit, although narrow slit structure has significantly placed restrictions on air-flow behind, also there is certain gas leak phenomenon.The stop block structure that Fig. 8 (b) provides is on narrow slit structure basis, be positioned at below convex, moving conductive rod is fixed block 1012 shown in figure, block 1012 top is arc-shaped, along arc structure, there is identical curvature 1013 times with convex, and keep the gap of 1mm.The employing of stop block structure increases the closure at arc control device rear further, and block quality is compared moving conductive rod and occupied very little ratio with the arm of force, not obvious to cut-offfing rate.
In this experiment, what provide experiment electric current is single-frequency oscillation circuit, and frequency of oscillation 50Hz, prospective short circuit current first half-wave effective value is 10kA, Capacitor banks charging voltage 500V.Fig. 9 cut-offs experimental waveform in two kinds of arc quenching chamber structure 10kA short circuit current situations.
By Fig. 9 experimental result, table 1 contrasts two kinds of model arc control device interrupting process major parameters.Contrast two kinds of structures and cut-off result, rear band stop block structure arc control device obtain higher electricity Hu electricity Ya Mine value, reach 308V, improve 36V than narrow slit structure, and so the arc time is only 9.12ms simultaneously, shortens 0.36ms.Advantageously the arc voltage of stop block structure arc control device rises to the time of peak value is that 5.72ms shortens 0.23ms than narrow slit structure, this means that stop block structure arc voltage has the higher rate of rise, has better current limiting performance.Its reason is that other structures of arc control device do not change, increase the closure at arc control device rear, the air pressure of arc control device can be improved on the one hand, airflow field in arc control device can be kept on the other hand to point to direction, gas outlet and strengthen the flow velocity of airflow field, thus the effect of air-blowing power in increase arc control device, be conducive to cooling electric arc and driving electric arc to enter arc extinguishing grid pieces obtaining higher arc voltage and cut-offfing effect.
Table 1 two kinds of rear structure arc control device experimental results
The present invention not only has the effect of closed rear air-flow; And and multifunction insulating plug-in unit first part can shield grid group leg, reduce metallic vapour And and have narrow slit suppression to electric arc, the insulating case first half that moving conductive rod insulating material makes can limit electric arc and stretch backward along moving conductive rod, if make of gas exhausted material, then after arc erosion, produce hydrogeneous gas, can cool and suppress electric arc, these effects comprehensive, adopt the present invention can increase substantially the current limliting break performance of breaker of plastic casing.
The breaker of plastic casing that application the present invention also can scold out in a 250A fixed contact, on oscillation circuit, the phase electric current of giving is under 15KA condition, and same circuit breaker adopts and do not adopt result of the test of the present invention as shown in table 2,
Visible: after same circuit breaker adopts the present invention, electricity Hu electricity Ya Mine value brings up to 590v from 282V, and blowout voltage brings up to 366V from 250v, and permit logical energy to be reduced to 553776 from 1242472, namely break performance increases substantially.
The same circuit breaker of table 2 adopts and does not adopt result of the test of the present invention
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.
Claims (1)
1. breaker of plastic casing contact and an arc quenching system, comprising: the arc extinguishing grid pieces group of multi-disc iron railings sheet composition, the fixed contact be fixed on static conductive rod, be fixed on the moving conductive rod support of moving contact on moving conductive rod and device moving conductive rod; Moving conductive rod support is driven by circuit breaker operation mechanism, can realize the breaking-closing operating of circuit breaker; It is characterized in that: between arc extinguishing grid pieces group and moving conductive rod support, a multifunction insulating plug-in unit is set; Rear end is with the moving conductive rod insulating case of an arcuated fin piece; Structure with in shape with multi-functional plug-in unit and be with the close-fitting moving conductive rod support of the moving conductive rod insulating case of fin, to realize the slipstream preventing interrupting process from being formed;
Described multifunction insulating insert rear end is an arc platform;
Described moving conductive rod pedestal lower end has the curved portions matched with the arc platform of multifunction insulating insert rear end, can prevent the thermal current of interrupting process from being spread to circuit breaker rear area by the space below moving conductive rod support;
The lower end of described moving conductive rod insulating case is with an arcuated fin piece; Described moving conductive rod pedestal lower end has a groove, and the arcuated fin piece of moving conductive rod insulating case can slide on groove; After the moving conductive rod of fixing moving contact is scolded out in interrupting process, the opening occurred between moving conductive rod and moving conductive rod support can be sealed, stop thermal current backward to enter rear by the cavity of moving conductive rod support, and the touch spring of protection setting in cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210461887.5A CN102938354B (en) | 2012-11-15 | 2012-11-15 | Contact and arc extinction system of mold case circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210461887.5A CN102938354B (en) | 2012-11-15 | 2012-11-15 | Contact and arc extinction system of mold case circuit breaker |
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| CN102938354A CN102938354A (en) | 2013-02-20 |
| CN102938354B true CN102938354B (en) | 2015-05-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103500692A (en) * | 2013-09-30 | 2014-01-08 | 长城电器集团有限公司 | Arc extinguishing device of circuit breaker |
| CN104538221B (en) * | 2014-11-17 | 2017-07-07 | 浙江天正电气股份有限公司 | Arc Distinguishing Device for Circuit Breakers and it is provided with the breaker of the Arc Distinguishing Device for Circuit Breakers |
| CN105206478A (en) * | 2015-08-05 | 2015-12-30 | 浙江凯发电气股份有限公司 | Device for accelerating repulsion of contacts of circuit breaker |
| CN107808806B (en) * | 2017-11-03 | 2020-04-17 | 浙江正泰电器股份有限公司 | Turnable movable contact component and switching device |
| CN109036907A (en) * | 2018-09-30 | 2018-12-18 | 无锡新宏泰电器科技股份有限公司 | A kind of insulation flash barrier and the arc-chutes with it |
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| CN201689852U (en) * | 2010-04-16 | 2010-12-29 | 江苏辉能电气有限公司 | Low-voltage circuit breaker movable contact structure with protecting part |
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| CN2743961Y (en) * | 2004-11-11 | 2005-11-30 | 常熟开关制造有限公司(原常熟开关厂） | Arc extinguishing device for circuit breaker |
| CZ298548B6 (en) * | 2006-02-01 | 2007-10-31 | Oez, S. R. O. | Electroinsulating cover of moving contact carrier of electric appliance, particularly of power circuit breaker |
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