CN203103210U - Vacuum arc extinguishing chamber and vacuum circuit breaker using same - Google Patents
Vacuum arc extinguishing chamber and vacuum circuit breaker using same Download PDFInfo
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- CN203103210U CN203103210U CN 201320042133 CN201320042133U CN203103210U CN 203103210 U CN203103210 U CN 203103210U CN 201320042133 CN201320042133 CN 201320042133 CN 201320042133 U CN201320042133 U CN 201320042133U CN 203103210 U CN203103210 U CN 203103210U
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- vacuum interrupter
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- 239000000463 material Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000010891 electric arc Methods 0.000 description 7
- 230000005520 electrodynamics Effects 0.000 description 6
- 230000002153 concerted effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
A vacuum arc extinguishing chamber and a vacuum circuit breaker using the same are disclosed. The vacuum arc extinguishing chamber comprises a housing, a moving electrode, a stationary electrode, and a corrugated pipe, wherein a vacuum cavity is formed in the housing, the moving electrode comprises a moving contact head and a moving contact head rod, the stationary electrode comprises a stationary contact head and a stationary contact head rod, an end of the corrugated pipe is connected with the moving contact head rod and the other end is connected with the housing, both the moving contact head and the stationary contact head are round-shaped and are arranged in a face-to-face manner, the moving contact head and the stationary contact head are provided with a pair of contact faces which contact with each other in a matching manner, at least a contact face is provided with a round angle or a chamfer angle, and the round angle or the chamfer angle is arranged at an edge part far away from the center of the contact face. The vacuum arc extinguishing chamber is characterized in that the distance between an inner edge line of the round angle or the chamfer angle and the center of the contact face is 1/2 to 4/5 of a radius of the contact face. The vacuum arc extinguishing chamber is advantaged by extremely strong short circuit current resistant capability, and that the vacuum circuit breaker is high in breaking capacity is guaranteed.
Description
Technical field
The utility model belongs to vacuum circuit-breaker technical field in the low-voltage distribution system, is specifically related to a kind of vacuum interrupter and uses the vacuum circuit-breaker of these arc control device.
Background technology
In modern power distribution systems, circuit breaker has the distribution electric energy, the effect of fault harm such as protection power supply and power consumption equipment are avoided transshipping, under voltage, short circuit, ground connection.Wherein, it cut-offs fault current vacuum circuit-breaker, can avoid air pressure, temperature, humidity, pollution that traditional air type circuit breaker is subjected to surrounding environment of living in easily etc. to influence problem, really realized the zero arcing of disjunction whole process, use in the place that being specially adapted to mine, tunnel etc. has flammable explosive gas to produce, and just more and more is subjected to the attention and the welcome in market.
Vacuum interrupter is the core component of vacuum switch electrical equipment, it mainly acts on: by being sealed in the connection and the disjunction of a pair of dynamic and static contact realization power circuit in the vacuum interrupter, and by the good insulation property of vacuum in the pipe, make behind the circuitry cuts electric current blow-out rapidly and suppress electric current, thereby can reliably disconnect normal circuit and disengagement failure circuit.
In the prior art, the structure of vacuum interrupter as shown in Figure 1, vacuum interrupter 5 comprises housing 51, fairlead 52, moving electrode 53, stationary electrode 54 and bellows 55, described housing 51 inside are formed with vacuum chamber 511, described moving electrode 53 comprises that the moving contact 531 and the end that are arranged in the vacuum chamber 511 are connected with moving contact 531, the other end extends to the movable contact rod 532 outside the plenum chamber 511, described stationary electrode 54 comprises that be used for fixed contact 541 and the end corresponding with described moving contact 531 that are arranged in the vacuum chamber 511 are connected with fixed contact 541, the other end extends to the stationary contact head rod 542 outside the vacuum chamber 511, described fairlead 52 is set on the movable contact rod 532 and with described housing 51 and fixes, be used for movable contact rod 532 is play the guiding role, one end of described bellows 55 is connected (as adopting the mode of welding) with movable contact rod 532, the other end of described bellows 55 is connected (as welding) with housing 51, to guarantee the vacuum degree of vacuum chamber 511 inside, the effect of bellows 55 is to guarantee that moving electrode 53 moves within the specific limits.Described moving contact 531, fixed contact 541 are the magnetic blow-out contact of trough of belt, both profiles are identical, be circle (as shown in Figure 2), and be face-to-face setting each other, on the contact-making surface of moving contact 531, fixed contact 541, offer groove 5341, less fillet or chamfering 5342 and vallecular cavity 5343 respectively accordingly, wherein: groove 5341 is arranged on the center position of contact-making surface, less fillet or chamfering 5342 are arranged on the deep edge of contact-making surface, vallecular cavity 5343 is opened between groove 5341 and the fillet 5342, has many and be set in distance.
When by short circuit current, because each equal short circuit current flow and produce magnetic field mutually in the residing low-tension switch electric appliance of vacuum interrupter, therefore every effect that all is subjected to the magnetic field of all the other each phases mutually, on macroscopic view, show as all the other each this phase loop electric power in the horizontal direction T that makes a concerted effort relatively, this loop electric power T that makes a concerted effort changes with the variation of short circuit current instantaneous value, put on the conductor of each phase, though therefore movable contact rod 532 keeps guiding by fairlead 52, but under very big loop electric power is made a concerted effort the effect of T, particularly for miniaturization, big electric current product under the cramped construction, movable contact rod 532 is partial to probably, cause moving contact 531 in the vacuum interrupter 5, the actual contact form of fixed contact 541 becomes one-sided contact, as shown in Figure 3.In order to take into account the long-life characteristics of product, can not be ceaselessly guarantee that by increasing contact pressure movable contact rod is not partial to.When deflection took place, effectively current-carrying area b in fact only was the area of the minority spot in the close outside on the contact-making surface, and short circuit current flows through from these spots, formed the electric current line c of side U-shaped.Because the offset distance a of electric current line c is bigger, so can form bigger electrodynamic repulsion force F(F and a between the electric current line on the moving contact 531, fixed contact 541
2Be directly proportional).When short circuit current big (as 80kA), this electrodynamic repulsion force F: the first, may be greater than the electronic balancing force and the spring pressure sum that put in the device for switching on the moving contact, thus cause contact to be scolded out; Second, though be not more than the electronic balancing force and the spring pressure sum that put in the device for switching on the moving contact, but because excessive electrodynamic repulsion force can cause the contact pressure at contact point place to reduce, contact resistance obviously increases, so very easily cause the overheated and melting welding of contact position.
Therefore as can be known, existing structure is anti-to the weak point that improves vacuum interrupter is disadvantageous.For this reason, the applicant has done actively and effectively to explore, and technical scheme described below produces under this background.
Summary of the invention
Task of the present utility model is that a kind of vacuum interrupter will be provided, and it is short anti-very competent, simultaneously, has guaranteed to use the vacuum circuit-breaker of this kind arc control device to have higher breaking capacity.
Task of the present utility model is finished like this, a kind of vacuum interrupter, this vacuum interrupter comprises housing, moving electrode, stationary electrode and bellows, described enclosure interior forms vacuum chamber, described moving electrode comprises that the moving contact and the end that are arranged in the vacuum chamber are connected with moving contact, the other end extends to the outer movable contact rod of vacuum chamber, described stationary electrode comprise be arranged in the vacuum chamber be used for the fixed contact corresponding with described moving contact and an end is connected with fixed contact, the other end extends to the outer stationary contact head rod of vacuum chamber, one end of described bellows is connected with movable contact rod, the other end is connected with housing, described moving contact, fixed contact is circle and is face-to-face setting each other, moving contact, fixed contact has a pair of contact-making surface of the cooperation of being in contact with one another, wherein deep edge is provided with a fillet or chamfering at least one contact-making surface, it is characterized in that: the inner edge of described fillet or chamfering is 1/2～4/5 of a contact-making surface radius to the distance at contact-making surface center.
In a specific embodiment of the present utility model, the contact-making surface of described moving contact, fixed contact is made by conduction, heat conduction, all good materials of mechanical performance.
In another specific embodiment of the present utility model, described conduction, heat conduction, all good materials of mechanical performance are chromiumcopper.
In another specific embodiment of the present utility model, described vacuum interrupter also comprises a fairlead, described fairlead is set on the movable contact rod and with described housing and fixes, constitute between described fairlead and the described movable contact rod and be slidingly matched, movable contact rod is play the guiding role by fairlead.
A kind of vacuum circuit-breaker, comprise Shell of circuit breaker, be fixed on operating mechanism on the Shell of circuit breaker, be fixed on last outlet busbar and following outlet busbar on the Shell of circuit breaker, described vacuum circuit-breaker also comprises an above-mentioned vacuum interrupter, described vacuum extinction chamber interior moving electrode attended operation mechanism, vacuum extinction chamber interior moving electrode is electrically connected goes up the outlet busbar, and stationary electrode is electrically connected outlet busbar down.
After adopting the technical solution of the utility model, the contact-making surface profile of moving contact, fixed contact as shown in Figure 7, wherein exemplarily provide a fillet or chamfering, the inner edge of fillet or chamfering is 1/2～4/5 of a contact contact-making surface radius to the distance at contact contact-making surface center.The inclined-plane of this fillet or chamfering constitutes the race cambered surface.After adopting technique scheme, though the apparent contact area of moving contact, fixed contact two contact-making surfaces reduce to some extent, little to the influence of contact current-carrying.The real contact area of contact is by the yield strength decision of contact pressure and contact material, so after processing bigger race cambered surface, because contact pressure and contact material are all less than changing, so the variation of the real contact area between moving contact, the fixed contact is also little, and can guarantee that still contact area is much larger than real contact area at this moment.
When by short circuit current, because each all is subjected to all the other each this phase loop electric power in the horizontal direction T that makes a concerted effort relatively mutually in the residing low-tension switch electric appliance of vacuum interrupter, though movable contact rod keeps guiding by fairlead, but under very big loop electric power is made a concerted effort the effect of T, it is stable that movable contact rod can not keep, may be partial to, cause the actual contact form of moving contact in the vacuum interrupter, fixed contact to become one-sided contact, as shown in Figure 6.At this moment, effectively current-carrying area b ' in fact only is the area of the minority spot in the close outside on the contact-making surface, and short circuit current flows through from these spots, forms the electric current line c ' of side U-shaped.Because the offset distance a ' of electric current line is more of the prior art little, so the electrodynamic repulsion force F ' that forms between the electric current line on the dynamic and static contact (F ' with (a ')
2Be directly proportional) more of the prior art also little, so help pressure between the face of keeping in touch.Therefore after adopting the technical solution of the utility model as can be known, anti-highly beneficial to the weak point that improves circuit breaker.
When the disjunction short circuit current, in the moment that moving contact separates with fixed contact, electric current is retracted on several points of contact separation just, make contact between resistance increase rapidly and cause that temperature raises rapidly, until the contact surface evaporation of metals takes place, form high electric field strength simultaneously, cause the puncture in gap between strong field emission and contact, produce vacuum arc.Because there is groove in contact contact-making surface center, the electric current line c that electric arc forms " be the side U-shaped equally, as shown in Figure 8.So the electric current in the contact can produce the direction magnetic field vertical with arc axis in the contact gap.When the electric current of disjunction is big (more than 40kA), electric arc becomes the gathering arc by the diffusion arc, this moment, electric arc was subjected to this action of a magnetic field, the electrodynamic repulsion force F1 that generation is offset electric arc laterally, can force electric arc promptly to run the outwards mobile rapidly and elongation of cambered surface, promote extinguishing of electric arc along the inclined-plane of bigger fillet or chamfering.
In sum, the utility model is because after adopting said structure, it is short anti-very competent, and also very favourable to the breaking capacity that improves circuit breaker.
Description of drawings
Fig. 1 is the structural representation of vacuum interrupter in the prior art.
Fig. 2 is the profile schematic diagram of the fixed contact/moving contact of vacuum interrupter in the prior art.
Fig. 3 is the schematic diagram that flows to of the contact form of vacuum interrupter contact by short circuit current time the in the prior art and electric current line.
Fig. 4 is the schematic diagram of a kind of feasible configurations of vacuum circuit-breaker of the present utility model.
Fig. 5 is an example structure schematic diagram of vacuum interrupter of the present utility model.
Fig. 6 is the schematic diagram that flows to of the contact form of the utility model vacuum interrupter contact by short circuit current time the and electric current line.
Fig. 7 is the profile schematic diagram of the fixed contact/moving contact of the utility model vacuum interrupter.
Fig. 8 for the utility model vacuum interrupter when the disjunction short circuit current electric current line flow to schematic diagram.
Embodiment
In order to make the public can fully understand technical spirit of the present utility model and beneficial effect; the applicant will describe in detail embodiment of the present utility model below in conjunction with the accompanying drawings; but the applicant is not restriction to technical scheme to the description of embodiment, anyly makes form but not the variation of essence all should be considered as protection range of the present utility model according to the utility model design.
Fig. 4 shows a kind of feasible structure of the vacuum circuit-breaker that adopts technical solutions of the utility model, the wherein internal structure of vacuum interrupter 5 such as Fig. 5.
See Fig. 4, a kind of vacuum circuit-breaker, comprise Shell of circuit breaker 1, be fixed on operating mechanism 2 on the Shell of circuit breaker 1, be fixed on last outlet busbar 4 and following outlet busbar 6 on the Shell of circuit breaker 1, described vacuum circuit-breaker also comprises a vacuum interrupter 5, the inner moving electrode of described vacuum interrupter 5 53 attended operation mechanisms 2, the contact that is specially attended operation mechanism 2 supports 3.Vacuum interrupter 5 inner moving electrodes 53 are electrically connected goes up outlet busbar 4, and stationary electrode 54 is electrically connected outlet busbar 6 down.
Please continue to consult Fig. 5, described vacuum interrupter 5 comprises housing 51, fairlead 52, moving electrode 53, stationary electrode 54 and bellows 55, the centre of described housing 51 has vacuum chamber 511, described moving electrode 53 comprises that the moving contact 531 and the end that are arranged in the vacuum chamber 511 are connected with moving contact 531, the other end extends upwardly to the movable contact rod 532 outside the vacuum chamber 511, described stationary electrode 54 comprises that be used for fixed contact 541 and the end corresponding with described moving contact 531 that are arranged in the vacuum chamber 511 are connected with fixed contact 541, the other end extends downward the stationary contact head rod 542 outside the vacuum chamber 511, being set on the movable contact rod 532 and with described housing 51 that described fairlead 52 slides fixed, be used for movable contact rod 532 is play the guiding role, an end of described bellows 55 is connected with movable contact rod 532, the other end is connected with housing 51.Consult Fig. 7, described moving contact 531, fixed contact 541 are the magnetic blow-out contact of trough of belt, and both profiles are identical, are circle and are face-to-face setting each other.The contact-making surface of moving contact 531, fixed contact 541 is made by conduction, heat conduction, all good materials of mechanical performance, is preferably the chromiumcopper material in the present embodiment.Moving contact 531, fixed contact 541 offers groove 5341 respectively accordingly at the center of contact-making surface, moving contact 531, fixed contact 541 has a pair of contact-making surface of the cooperation of being in contact with one another, wherein deep edge is provided with a fillet or chamfering 5342 at least one contact-making surface, the inner edge 53421 of fillet that this is bigger or chamfering 5342 (inner edge 53421 refers to: fillet or chamfering 5342 are near the original position line at contact-making surface centers) to the distance at contact-making surface center be the contact-making surface radius 1/2～4/5 (contact-making surface refers to: the original contact plane when not offering fillet or chamfering 5342), spaced apart many vallecular cavities 5343 that are provided with between groove 5341 and bigger fillet or chamfering 5342.
When on go out to arrange bus 9 and feed short circuit currents, because the electrodynamic repulsion force that produces between the moving contact 531 of vacuum interrupter 5, the contact-making surface of fixed contact 541 is not very big, so circuit breaker can bear short circuit current bigger in the short time, during the disjunction short circuit current, drive vacuum interrupter 5 by mechanism 1 and carry out separating brake, moving contact 531 separates with fixed contact 541 and produces vacuum arc in the vacuum interrupter 5, electric arc promptly runs the outwards mobile rapidly and elongation of cambered surface along the inclined-plane of bigger fillet or chamfering 5342, therefore very helps blow-out.
Claims (5)
1. vacuum interrupter, this vacuum interrupter (5) comprises housing (51), moving electrode (53), stationary electrode (54) and bellows (55), the inner vacuum chamber (511) that forms of described housing (51), described moving electrode (53) comprises that the moving contact (531) and the end that are arranged in the vacuum chamber (511) are connected with moving contact (531), the other end extends to the outer movable contact rod (532) of vacuum chamber (511), described stationary electrode (54) comprise be arranged in the vacuum chamber (511) be used for the fixed contact (541) corresponding with described moving contact (531) and an end is connected with fixed contact (541), the other end extends to the outer stationary contact head rod (542) of vacuum chamber (511), one end of described bellows (55) is connected with movable contact rod (532), the other end is connected with housing (51), described moving contact (531), fixed contact (541) is circle and is face-to-face setting each other, moving contact (531), fixed contact (541) has a pair of contact-making surface of the cooperation of being in contact with one another, wherein deep edge is provided with a fillet or chamfering (5342) at least one contact-making surface, it is characterized in that: the inner edge (53421) of described fillet or chamfering (5342) is 1/2～4/5 of a contact-making surface radius to the distance at contact-making surface center.
2. vacuum interrupter according to claim 1 is characterized in that the contact-making surface of described moving contact (531), fixed contact (541) is made by conduction, heat conduction, all good materials of mechanical performance.
3. vacuum interrupter according to claim 2 is characterized in that described conduction, heat conduction, all good materials of mechanical performance are chromiumcopper.
4. vacuum interrupter according to claim 1, it is characterized in that described vacuum interrupter (5) also comprises a fairlead (52), the movable contact rod (532) that is set in described fairlead (52) goes up and is fixing with described housing (51), constitute between described fairlead (52) and the described movable contact rod (532) and be slidingly matched, movable contact rod (532) is play the guiding role by fairlead (52).
5. vacuum circuit-breaker, comprise Shell of circuit breaker (1), be fixed on operating mechanism (2) on the Shell of circuit breaker (1), be fixed on last outlet busbar (4) and following outlet busbar (6) on the Shell of circuit breaker (1), it is characterized in that: described vacuum circuit-breaker also comprises the vacuum interrupter (5) just like claim 1 or 2 or 3 or 4, the inner moving electrode of described vacuum interrupter (5) (53) attended operation mechanism (2), outlet busbar (4) in the inner moving electrode of vacuum interrupter (5) (53) electrical connection, stationary electrode (54) are electrically connected outlet busbar (6) down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320042133 CN203103210U (en) | 2013-01-25 | 2013-01-25 | Vacuum arc extinguishing chamber and vacuum circuit breaker using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320042133 CN203103210U (en) | 2013-01-25 | 2013-01-25 | Vacuum arc extinguishing chamber and vacuum circuit breaker using same |
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| Publication Number | Publication Date |
|---|---|
| CN203103210U true CN203103210U (en) | 2013-07-31 |
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| CN 201320042133 Expired - Lifetime CN203103210U (en) | 2013-01-25 | 2013-01-25 | Vacuum arc extinguishing chamber and vacuum circuit breaker using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513884A (en) * | 2014-10-14 | 2016-04-20 | 杨永清 | Manufacturing method of vacuum arc extinguishing chamber especially for direct-current switch electric appliance |
| CN110600291A (en) * | 2013-09-04 | 2019-12-20 | 伊顿智能动力有限公司 | Vacuum switching apparatus and contact assembly thereof |
-
2013
- 2013-01-25 CN CN 201320042133 patent/CN203103210U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110600291A (en) * | 2013-09-04 | 2019-12-20 | 伊顿智能动力有限公司 | Vacuum switching apparatus and contact assembly thereof |
| CN110600291B (en) * | 2013-09-04 | 2022-06-03 | 伊顿智能动力有限公司 | Vacuum switching apparatus and contact assembly thereof |
| CN105513884A (en) * | 2014-10-14 | 2016-04-20 | 杨永清 | Manufacturing method of vacuum arc extinguishing chamber especially for direct-current switch electric appliance |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130731 |
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| CX01 | Expiry of patent term |