CN1178258C - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN1178258C CN1178258C CNB991085434A CN99108543A CN1178258C CN 1178258 C CN1178258 C CN 1178258C CN B991085434 A CNB991085434 A CN B991085434A CN 99108543 A CN99108543 A CN 99108543A CN 1178258 C CN1178258 C CN 1178258C
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- CN
- China
- Prior art keywords
- electric arc
- arc
- movable contact
- contact
- reflecting part
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
Provided is a circuit breaker. In a circuit breaker equipped with a movable contact having a movable contact point and a fixed contact having a fixed contact point, an arc reflecting member serving as a pressure receiving part for facilitating the operation of separating the movable contact from the fixed contact by receiving pressure of an arc and arc gas generated between the movable contact point, and the fixed contact point is provided on the movable contact. Such that the breaking performance is excellent.
Description
The present invention relates to circuit breaker, relate in particular to the improvement of miniature circuit breaker opening performance.
Figure 10 and Figure 11 are the interior views after the conventional circuit breaker local excision shown in the open 1998-172409 communique of Japanese patent of invention, and Figure 10 is the front view of its on-state, and Figure 11 is the front view of expression tripping state.
Among the figure, the 21st, base, the 22nd, cover all is the insulation framework made from the synthetic resin material.The 23rd, fixed contact, the 24th, be fixed on the fixed contact on this fixed contact 23, the 25th, connect movable contact from freely with this fixed contact, 25a is the moving contact that is fixed on this movable contact 25, the 26th, support the supporting arm of this movable contact 25 integratedly, form U font groove 26a, stop holding section 26b on it, and for the slotted hole 26c of axle 27 engagings described later etc.
The 27th, become the axle of the center of rotation of supporting arm 26 and movable contact 25.The 28th, all the time with the main spring of movable contact 25 to the direction reinforcing that breaks away from fixed contact 24, the 29th, handle, the 30th, with the back-moving spring of handle 29 to the counter clockwise direction reinforcing, the 31st, curve the operation link rod that forms behind the U font by the pole material, one end of this operation link rod 31 engages with handle 29, and the other end engages with the link rod slot 32a of latch 32 described later.
The 32nd, axle is bearing in the latch of axle on 27, the triggering sheet 32b of the pushing force of the bar 37 that form the link rod slot 32a that engages with the other end of operating link rod 31 on this latch 32, bears aftermentioned electromagnetism tripping portion 34, bears the triggering sheet 32c etc. that will operate link rod 31 and the power that engages release direction of link rod slot 32a with the pushing force that is bent to form of aftermentioned bimetal leaf 33.
Constitute switching mechanism by above-mentioned supporting arm 26, main spring 28, handle 29, back-moving spring 30, operation link rod 31 and latch 32 etc.
The 33rd, corresponding electrical current is heated and goes up the bimetal leaf of right-hand bending to figure, the 34th, electromagnetism tripping portion has the bar 37 that stretches out to the direction of arrow (left) because of to the driven plunger 36 of the energising electromagnetic force of electromagnet 35 with because of the attraction of this plunger 36 action.Form the overcurrent tripper by above-mentioned bimetal leaf 33 and electromagnetism tripping portion 34.
The 38th, arc-control device, the 39th, the arc extinguishing board of this arc-control device 38.The 40th, comprise the electric arc generation chamber of said fixing contact 24 and movable contact 25, be full of the electric arc A that produces when movable contact 25 breaks away from.
21a stretches out the stop of off position of formation, the above-mentioned moving contact 25a of decision to internal direction on base 21, its position leave electric arc generation chamber 40 and above-mentioned moving contact 25a and become supporting arm 26 centers of rotation spools 27 near.The 41st, with the arc runner (runner) of electric arc to the guiding of arc-control device 38 directions.
On the conventional circuit breaker of said structure, in case there is short circuit current to flow into circuit, electromagnet 35 perception immediately of electromagnetism tripping portion 34, plunger 36 is attracted, the bar 37 of interlock moves to the direction of arrow (left of Figure 11) with it, the tripping sheet 32b of pushing latch 32 makes the other end of operation link rod 31 deviate to do tripping action from link rod slot 32a, movable contact 25 is speeded away and does to open circuit action.
In a single day the conventional circuit breaker of said structure has big electric current inflow circuit such as short circuit current, operating mechanism portion just works so that moving contact 25a breaks away from fixed contact 24, but can produce electric arc A (Figure 11) this moment between fixed contact 24 and moving contact 25a, and produce arc voltage between fixed contact 24 and moving contact 25a.
This arc voltage increases along with the distance of moving contact 25a and fixed contact 24 and rises.And electric arc A is activated simultaneously and walks to the direction of arc extinguishing board 39, and then is elongated by the magnetic attraction of arc extinguishing board 39, so arc voltage is risen more.So the arc voltage that rises can make electric current be suppressed and reduce.In this case, arc current welcomes current zero, and electric arc A arc extinguishing finishes to open circuit.
The action of opening circuit of above-mentioned conventional circuit breaker has following problem.
The electric arc A that produces when large current interruptions such as short circuit current is owing to the driving that flows into the magnetic field that the electric current of movable contact 25 with fixed contact 23 produce, mainly along arrow S1 direction walking shown in Figure 8, but when particularly using the high material of metal vapors pressure in the contact, the actuating force that surpasses aforementioned magnetic field because of the steam pressure that produces from the contact, so electric arc A can be adhered between the contact, and opening performance is significantly reduced.
In addition, be subjected to the driving of arrow S1 direction and can flow backwards, and be trapped near the contact, become the reason that between the contact, produces electric arc once more, can reduce opening performance with the part of the hot gass such as metal vapors of the wall (not shown) of arc-control device 38 downstreams one side collision.
The object of the present invention is to provide a kind ofly can address the above problem, electric arc is difficult near the adhesion contact, the circuit breaker that can promptly electric arc be improved with arc extinguishing, opening performance to arc extinguishing board 39 guiding.
The present invention is a kind of circuit breaker, be provided with movable contact with moving contact and fixed contact with fixed contact, be characterized in, movable contact is provided with the electric arc reflecting member with reflecting part, with this reflecting part as the pressure that bears the electric arc that takes place between moving contact and the fixed contact and arcing gas and impel this movable contact to break away from the pressure bearing portion of fixed contact.
In addition, characteristics of the present invention are that the electric arc reflecting member has reflecting part that makes the electric arc reflection and the reflecting part that bears arcing gas pressure.
In addition, the present invention is a kind of circuit breaker, has the insulation framework that constitutes by base and cover, be installed in the fixed contact of this insulation framework inside, movable contact in the face of this fixed contact contact and disengaging, support the supporting arm of this movable contact, drive the switching mechanism of movable contact, make switching mechanism work so that the overcurrent tripper that movable contact leaves according to overcurrent, the electric arc generation chamber of the electric arc that takes place when being full of above-mentioned movable contact and leaving, and the electric arc that this electric arc generation chamber is interior carries out the arc-control device of arc extinguishing
Be characterized in, electric arc reflecting member and movable contact together are arranged on the above-mentioned supporting arm, and this electric arc reflecting member is with stoping electric arc or arcing gas to flow and first reflecting part that makes it to reflect to the electric arc direction of travel and second reflecting part that extends to electric arc direction of travel two sides from the two ends of this first reflecting part to surround from the three parts moving contact of above-mentioned movable contact to open-close mechanism section one side.
In addition, characteristics of the present invention are, are provided with the pressure ramp that the electric arc walking path till from the contact periphery that produces electric arc to arc-control device is enlarged this electric arc walking path sectional area towards the electric arc direction of travel.
In addition, characteristics of the present invention are that pressure ramp is provided with the stage portion that enlarges these two sidewall interbody spacers on two sidewalls of electric arc walking path.
In addition, characteristics of the present invention are to understand the synthetic resin that produces gas behind the heat of the reflecting part of electric arc reflecting member with the electric arc of accepting to have taken place and make.
Simple declaration to accompanying drawing
Local excision's front view of internal state when Fig. 1 is expression example 1 closing of power circuit breaker.
Local excision's front view of internal state when Fig. 2 is the 1 circuit breaker tripping of expression example.
Fig. 3 is the front view that the movable contact of electric arc reflecting member is housed.
Fig. 4 is the end view of Fig. 3.
Fig. 5 is the front view of electric arc reflecting member.
Fig. 6 is the end view of Fig. 5.
Fig. 7 is the upward view of Fig. 6.
Local excision's front view of internal state when Fig. 8 is the 2 circuit breaker trippings of expression example.
Fig. 9 is the A-A phantom of Fig. 8.
Local excision's front view of internal state when Figure 10 is the connection of expression conventional circuit breaker.
Local excision's front view of internal state when Figure 11 is the tripping of expression conventional circuit breaker.
Below in conjunction with description of drawings example of the present invention.
Example 1
Fig. 1 and Fig. 2 are local excision's front views of the circuit breaker internal state of expression the present invention one example, and Fig. 1 is the front view of expression on-state, and Fig. 2 is the front view of expression tripping operate condition.Fig. 3 is the front view that the movable contact of electric arc reflecting member is housed, and Fig. 4 is the end view of Fig. 3, and Fig. 5 is the front view of electric arc reflecting member, and Fig. 6 is its end view, and Fig. 7 is its upward view., omit its detailed description to 21～24,26～41 expressions of the symbol shown in Fig. 7 and Figure 10 and the same member of conventional apparatus shown in Figure 11 at Fig. 1 at this.
This circuit breaker has the insulation framework that is made of base 21 and cover 22, be installed in the fixed contact 23 of this insulation framework inside, contact with this fixed contact 23 and break away from the movable contact 25 that rotates freely, rotate the supporting arm 26 that supports this movable contact 25 freely, above-mentioned movable contact 25 is made the switching mechanism that rotation drives, corresponding overcurrent and the overcurrent tripper that makes above-mentioned switching mechanism work and above-mentioned movable contact 25 is left, the electric arc generation chamber 40 of the electric arc A that takes place when being full of above-mentioned movable contact 25 and leaving, the arc-control device 38 that 40 interior electric arc A carry out arc extinguishing is taken place in this arc chamber.
The present invention is equipped with the electric arc reflecting member with this movable contact 25 1 body actions on this movable contact 25 in above-mentioned circuit breaker.
The reflecting part of electric arc reflecting member is as pressure bearing portion, impel this movable contact 25 to leave fixed contact 23a by the electric arc A that takes place between the moving contact 25a that bears at movable contact 25 and the fixed contact 24 with the bulbs of pressure of the simultaneous arcing gas of this electric arc A (hot gas), in order to bear this pressure effectively, this reflecting part be arranged on this movable contact 25 near.
Electric arc reflecting member 50 shown in this example 1 together is fixed on an end of supporting arm 26 with movable contact 25 as shown in Figures 3 and 4.These electric arc reflecting member 50 usefulness synthetic resin materials form Fig. 5 to form shown in Figure 7, being installed to the fixed part 50a that uses on the movable contact 25 reaches from this fixed part 50a to scheming to go up a plurality of pin 50b that left stretches out abreast, 50b, from fixed part 50a to figure go up right-hand extension and stop electric arc A and arcing gas to switching mechanism one side flow with reflection round about, promptly as the first reflecting part 50c that bears the reflecting part of above-mentioned pressure, the a pair of second reflecting part 50d as the reflecting part that extends in parallel to the figure upper and lower from the both ends of this first reflecting part 50c, 50d, a pair of the 3rd reflecting part 50e as the reflecting part that extends to the figure upper and lower from fixed part 50a, reflecting parts such as 50e form the form of surrounding moving contact 25a (see figure 4) from the three parts.
On the circuit breaker of said structure, in case big electric current inflow circuit such as short circuit current are arranged, the electromagnet 35 of electromagnetism tripping portion 34 is promptly to this perception, plunger 36 is attracted, the bar 37 of interlock moves and pushes the triggering sheet 32b of latch 32 to the direction of arrow with it, the other end of operation link rod 31 is deviate from from link rod slot 32a, done the tripping action, movable contact 25 is speeded away do to open circuit action.In this occasion, electric arc reflecting member 50 and movable contact 25 1 body actions.
In circuit breaker tripping operate condition shown in Figure 2, the driving of magnetic field that the electric arc A that takes place between fixed contact 24 and moving contact 25a takes place owing to the electric current that flows into movable contact 25 and fixed contact 23 and the reflected pressure that forms by the first reflecting part 50c of electric arc reflecting member 50 and the hot gas of second reflecting part 50d reflection etc. and walking to arrow S1 direction, and then be directed in the arc-control device 38, and separate and cooling back arc extinguishing by arc extinguishing board 39 by the magnetic force of arc extinguishing board 39.
In addition, in the part of the arcing gas that takes place between the contact and be located near the two sides of moving contact 25a the 3rd reflecting part 50e collision, power as movable contact 25 departure directions plays a role, so can promote the departure motion of movable contact 25, and because this facilitation, movable contact 25 just leaves fixed contact 23 at faster speed.
Thereby, shorten electric arc A and be adhered to time between the contact, make electric arc A more promptly to the walking of arrow S1 direction, it promptly is directed in the arc-control device 38.
This example 1 is owing to be provided with electric arc reflecting member 50 on movable contact 25, this electric arc reflecting member 50 has the first reflecting part 50c and the second reflecting part 50d of reflection arcing gas and bears the 3rd reflecting part 50e of arcing gas pressure, so when circuit breaker is done the tripping action, the electric arc A that takes place between fixed contact 24 and moving contact 25a is just by the part of this reflecting member, promptly the 3rd reflecting part 50e stops, the pressure of arcing gas is joined in the breakaway of movable contact 25 and accelerate opening speed, make arcing gas to the arrow S1 direction walking opposite with the first reflecting part 50c and the second reflecting part 50d simultaneously with electric arc reflecting member 50, promptly guide them into arc-control device 38 directions, so the quenching time can be shortened, improve opening performance.
If in above-mentioned electric arc reflecting member, reflecting part adopts the sort of heat because of the electric arc A that accepts to have produced to produce the synthetic resin of gas at least, and then effect is better.Will produce the synthetic resin of a large amount of gases such as polyamide etc. and make if the material of electric arc reflecting member 50 is accepted heat with the sort of one, then can utilize gas that the high heat back of accepting electric arc A produces from electric arc reflecting member 50 with electric arc A and arcing gas more promptly to arrow S1 direction, be the direction of travel guiding of electric arc A, can further improve opening performance.
Example 2
Example 2 is examples that pressure ramp is set, and enlarges the sectional area of this electric arc walking path towards the direction of travel of electric arc with the electric arc walking path till will be from the contact periphery that produces electric arc to arc-control device.
Fig. 8 is local excision's front view of expression circuit breaker internal structure, and Fig. 9 is the A-A phantom of Fig. 8.In Fig. 8 and Fig. 9, arrive the identical symbolic representation same section of Fig. 7, its explanation of Therefore, omited with Fig. 1.
Fig. 8 and pressure ramp shown in Figure 9 are to form by form the stage portion that enlarges the two side interbody spacer on the two side of electric arc walking path.
This insulation board 60 is on its cross section, by the 1st pedestal part 60a, from the 1st pedestal part 60a continuity and have stage portion 60b the second pedestal part 60c, and constitute from the protuberance 60d that the end of this second pedestal part 60c rises, by from as the sidewall of electric arc walking path, be that the wall of base 21 is fixed on the wall of this walking path to a plurality of pin 21b that walking path stretches out.
In the tripping action of said structure circuit breaker shown in Figure 8, electric arc A that takes place between fixed contact 24 and moving contact 25a and electric arc reflecting member 50 collide and the disconnection action of acceleration movable contact 25, the pressure that is reflected simultaneously drives to arrow S1 direction, and then in arc-control device 38, guided, and separated by arc extinguishing board 39 and cool off the back arc extinguishing by the magnetic force of arc extinguishing board 39.
On the other hand, driven and can be flow backwards to the contact direction to figure upward arrow S1 direction walking and with the part of the arcing gas of wall (not shown) collision in arc-control device 38 downstreams, to move to once again near the contact, but this portion gas can and flow backwards with the stage portion 60b of insulation board 60 collision, has so just stoped arcing gas to enter near the contact by this pressure ramp.
The electric arc walking path of this example 2 till from the contact periphery that produces electric arc A to arc-control device 38 is provided with insulation board 60, which is provided with along the electric arc direction of travel and form the stage portion 60b that pressure ramp is used, so electric arc A promptly can be guided to the direction of arc-control device 38, available this stage portion 60b prevents that arcing gas from flowing backwards from arc-control device 38 directions simultaneously, so stably arc extinguishing can be realized stable the opening circuit that breaking time is short.
The present invention adopts said structure, so have following effect.
On circuit breaker of the present invention, even the high material of evaporation of metal air pressure is used in the contact, also can utilize the effect of electric arc reflecting member and make the electric arc inadhesion between the contact but promptly to the walking of arc extinguishing board direction, so can shorten the quenching time, improve opening performance, can realize that high current limliting opens circuit.
In addition, the electric arc walking path upper edge electric arc direction of travel of the present invention till from the contact periphery to arc-control device is provided with pressure ramp such as stage portion, so can stop and part direction between the contact of the hot gas of the wall in arc-control device downstream collision flows backwards, can prevent between the contact etc. that electric arc takes place the short part of space insulation distance once more, can realize that stable high current limliting opens circuit.
In addition, the present invention makes the reflecting part of electric arc reflecting member when being subjected to electric arc high hot with regard to the synthetic resin that produces a large amount of gases, can with accept gas that high heat back produces from the electric arc reflecting member with electric arc A and arcing gas quickly to arrow S1 direction, be the direction of travel guiding of electric arc A, can further improve opening performance.
Claims (8)
1. circuit breaker, have the insulation framework that constitutes by base and cover, the fixed contact that is installed in this insulation framework inside, in the face of this fixed contact contact and the switching mechanism of the movable contact that breaks away from, driving movable contact, according to overcurrent make switching mechanism work so that the overcurrent tripper that described movable contact leaves, when being full of described movable contact and leaving the electric arc of generation the electric arc generation chamber and the electric arc in this electric arc generation chamber is carried out the arc-control device of arc extinguishing
It is characterized in that, on described movable contact, be provided with electric arc reflecting member with reflecting part, this reflecting part has the surface in the face of arc region, the electric arc that this reflecting part produces as the arc region of bearing between moving contact and fixed contact and the pressure of arcing gas and impel this movable contact to break away from the pressure bearing portion of fixed contact and play a role.
2. circuit breaker according to claim 1 is characterized in that, the electric arc reflecting member has reflecting part that makes the electric arc reflection and the reflecting part that bears arcing gas pressure.
3. circuit breaker, has the insulation framework that constitutes by base and cover, be installed in the fixed contact of this insulation framework inside, movable contact in the face of this fixed contact contact and disengaging, support the supporting arm of this movable contact, drive the switching mechanism of movable contact, make switching mechanism work so that the overcurrent tripper that described movable contact leaves according to overcurrent, the electric arc generation chamber of the electric arc that takes place when being full of described movable contact and leaving, and the electric arc that this electric arc generation chamber is interior carries out the arc-control device of arc extinguishing
It is characterized in that having the electric arc reflecting member that is fixed on the described supporting arm, this electric arc reflecting member has first reflecting part and second reflecting part, surrounds the moving contact of described movable contact from the three parts,
Described first reflecting part is located between described switching mechanism and the described electric arc generation chamber, reflect to the electric arc direction of travel to stop electric arc and arcing gas to flow and make it to open-close mechanism section one side, described second reflecting part extends to the two sides of electric arc direction of travel from the two ends of this first reflecting part.
4. according to each described circuit breaker of claim 1 to 3, it is characterized in that, be provided with the pressure ramp that the electric arc walking path till from the contact periphery that produces electric arc to arc-control device is enlarged this electric arc walking path sectional area towards the electric arc direction of travel.
5. circuit breaker according to claim 4 is characterized in that, pressure ramp is provided with the stage portion that enlarges these two sidewall interbody spacers on two sidewalls of electric arc walking path.
6. according to each described circuit breaker of claim 1 to 3, it is characterized in that the synthetic resin that produces gas behind the heat of the reflecting part of electric arc reflecting member with the electric arc of accepting to have produced is made.
7. circuit breaker according to claim 4 is characterized in that, understands the synthetic resin that produces gas behind the heat of the reflecting part of electric arc reflecting member with the electric arc of accepting to have produced and makes.
8. circuit breaker according to claim 5 is characterized in that, the synthetic resin that produces gas behind the heat of the reflecting part of electric arc reflecting member with the electric arc of accepting to have produced is made.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11037106A JP2000243208A (en) | 1999-02-16 | 1999-02-16 | Circuit breaker |
| JP037106/1999 | 1999-02-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1264147A CN1264147A (en) | 2000-08-23 |
| CN1178258C true CN1178258C (en) | 2004-12-01 |
Family
ID=12488356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991085434A Expired - Fee Related CN1178258C (en) | 1999-02-16 | 1999-06-23 | Circuit breaker |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2000243208A (en) |
| CN (1) | CN1178258C (en) |
| TW (1) | TW499692B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270555A (en) * | 2011-07-07 | 2011-12-07 | 西安交通大学 | Arc-extinguishing chamber of low-voltage circuit breaker |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5313933B2 (en) * | 2010-01-18 | 2013-10-09 | 三菱電機株式会社 | Circuit breaker |
| JP7333768B2 (en) * | 2020-05-26 | 2023-08-25 | 三菱電機株式会社 | circuit breaker |
-
1999
- 1999-02-16 JP JP11037106A patent/JP2000243208A/en active Pending
- 1999-05-28 TW TW88108799A patent/TW499692B/en not_active IP Right Cessation
- 1999-06-23 CN CNB991085434A patent/CN1178258C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270555A (en) * | 2011-07-07 | 2011-12-07 | 西安交通大学 | Arc-extinguishing chamber of low-voltage circuit breaker |
| CN102270555B (en) * | 2011-07-07 | 2014-08-06 | 西安交通大学 | Arc-extinguishing chamber of low-voltage circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1264147A (en) | 2000-08-23 |
| JP2000243208A (en) | 2000-09-08 |
| TW499692B (en) | 2002-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| 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: 20041201 Termination date: 20110623 |