CN1259753A - Buffer type gas circuit breaker - Google Patents

Abstract

The invention provides a breaker which can manage with a drive device of smaller size than conventional. A gas-blast breaker is structure with a gas bleeding hole penetrating from a buffer chamber into the side opposite a stationary arc contacting piece being formed in a stationary piston, and a gas bleeder valve, energized in the direction of closing at normal times, is installed at the opening of the bleeder hole on its side opposite to the puffer chamber, and a push rod capable of penetrating the hole is provided protrusively from the puffer chamber on its side with the contacting piece toward the bleeder hole, and after the time period of the maximum arc, the push rod penetrates the hole to press the valve to cause it to be opened, and through this valve, the compressed gas in the puffer chamber is discharged towards the stationary piston on its side opposite the puffer chamber.

Description

Buffer type gas circuit breaker

The present invention relates to the SF that alternating current circuit is used ₆Gas-break switch relates in particular to the circuit breaker that can use little drive unit.

Figure 29 is the cutaway view of the traditional buffer type gas circuit breaker internal structure of expression.Charging into insulating gas, be SF ₆But pack in the not shown airtight container of gas the phase mutual connection from fixedly striking auxiliary contact 2 and movable striking auxiliary contact 4.Fixedly striking auxiliary contact 2 are rod, form one with fixing energising contact 14 simultaneously, and are connected with alternating current circuit.On the other hand, movable striking auxiliary contact 4 are cylindric, are fixed on simultaneously on the air exhaust rod 6.Periphery in air exhaust rod 6 is fixed with bounce cylinder 8, is fixing movable energising contact 16 and insulation nozzle 18 in the bottom of this bounce cylinder 8.At the inside of bounce cylinder 8 intercalation fixed piston 10, this fixed piston 10 and the inner peripheral surface of bounce cylinder 8 and the outer peripheral face sliding contact of air exhaust rod 6.Form the surge chamber 8A of tubular thus in the inside of bounce cylinder 8, fixed piston 10 stops up surge chamber 8A.In addition, form the current collection contact 26 of one and the outer peripheral face sliding contact of bounce cylinder 8 with fixed piston 10.Have, the top of air exhaust rod 6 is connected with not shown drive unit outside the airtight container across insulating bar 12 again.Form the steam vent 6A that is communicated with the through hole 4A of movable striking auxiliary contact 4 on the air exhaust rod 6, the interior free space 33 of the open pore 6B that the upside of this steam vent 6A is used in the radial direction perforation and airtight container is communicated with.

In Figure 29, fixedly striking auxiliary contact 2, fixing energising contact 14, fixed piston 10 and current collection contact 26 are all motionless, are fixed on the airtight container.Movable striking auxiliary contact 4, movably switch on contact 16, air exhaust rod 6, bounce cylinder 8, insulation nozzle 18 and insulating bar 12 then forms movable part, can move along the above-below direction of Figure 29.Movable striking auxiliary contact 4 movable parts such as grade are subjected to the driving of drive unit and move, and drive unit then is according to the clearance order or the start that goes code.Reinforcing with the electric power and the spring that saves up strength drives to drive unit.Figure 29 state in the action of representing to open circuit, the state that promptly movable striking auxiliary contact 4 movable parts such as grade are moved upward just integratedly.Leaving 22 places, gap generation electric arc 20 this moment.

State when the electric arc that the cutaway view of Figure 30 state that to be the expression movable part more be moved upward from the state of Figure 29, expression leave 22 places, gap has just disappeared.Compare with the state of Figure 29, surge chamber 8A is littler, and it is bigger to leave gap 22 simultaneously.

Come to illustrate the disconnecting mechanism of this circuit breaker again with Figure 29.During closing of power circuit breaker, movable striking auxiliary contact 4 movable parts such as grade are positioned at the position of omiting downside than Figure 29, and fixedly striking auxiliary contact 2 embed the through hole 4A inside of movable striking auxiliary contact 4, and fixing simultaneously energising contact 14 contacts with the movable contact 16 that switches on.Therefore, the breaker electrifying electric current during connection is to fixing energising contact 14 and movable energising contact 16 and fixedly striking auxiliary contact 2 and the shunting of movable striking auxiliary contact 4 both sides.In case there is clearance order to send, aforementioned drive unit is start, and movable part is driven upward, and thereupon, the pressure of surge chamber 8A rises.This is that piston 10 is sealed because the upper side of surge chamber 8A is fixed, and the internal volume of surge chamber 8A is along with moving of movable part due to dwindling gradually.In case movable part further rises, at first be that fixing energising contact 14 breaks away from movable energising contact 16.And at this moment fixedly striking auxiliary contact 2 and movable striking auxiliary contact 44 do not break away from as yet mutually.So therefore electric arc do not take place in fixing energising contact 14 and movable 17 places, gap of leaving that switch between the contact 16 by fixedly striking auxiliary contact 2 and movable striking auxiliary contact 4 are mobile in electrical current.So on fixing energising contact 14 and movable energising contact 16 contact can not take place consumes.In case movable part further rises, fixedly begin to break away between striking auxiliary contact 2 and the movable striking auxiliary contact 4, as shown in figure 29, leaving 22 places, gap generation electric arc 20.At this moment, the SF of savings in surge chamber 8A ₆The Compressed Gas of gas promptly blows out to leaving gap 22 along insulation nozzle 18 from blowing out hole 8B.The heat that this Compressed Gas adds electric arc 20 forms high-temperature high-pressure state.When movable part further rose, promptly as shown in figure 30, fixedly striking auxiliary contact 2 were extracted from the 18A of throat of insulation nozzle 18, just blew out downwards from the 18A of throat so leave the Compressed Gas of the HTHP in the gap 22.On the other hand, the part of the Compressed Gas of this HTHP blows out by the through hole 4A of movable striking auxiliary contact 4 and the steam vent 6A and the open pore 6B free space 33 upward of air exhaust rod 6.By flowing of this Compressed Gas with electric arc cooling and elimination.Movable part further rises from the state of Figure 30, opens circuit thereby finish.The power supply that then will flow in bounce cylinder 8 by sliding contact in galvanization in current collection contact 26 is concentrated, and will flow through the electric current that comes from movable striking auxiliary contact 4 simultaneously and exchange main circuit with fixed piston 10 as concentrating electrical current to be sent to by air exhaust rod 6.In addition, fixedly striking auxiliary contact 2 and movable striking auxiliary contact 4 usefulness arc resistance materials are made.

Figure 31 is the performance diagram of the characteristic of expression Figure 29 device when opening circuit action.Transverse axis express time, the longitudinal axis represent that the position of electric current, movable part and the pressure of surge chamber rise.Waveform 24 is the short circuit currents that flow into circuit breaker from alternating current circuit, and solid line characteristic 51S represents the position of the movable part of Figure 29 circuit breaker, and solid line characteristic 51P represents that the interior pressure of the surge chamber 8A of Figure 29 circuit breaker rises.

In Figure 31, when the short circuit current shown in the waveform 24 flows into alternating current circuit, in case have clearance order to send in time T 0, then the movable part of circuit breaker is shown in characteristic 51S, move to the position of off state Y direction from the position X of on-state, and fixedly the striking auxiliary contact begin to disconnect in time T 1 with movable striking auxiliary contact.On the other hand, because movable part is mobile, shown in characteristic 51P, the pressure of surge chamber rises, and Compressed Gas blows on the electric arc that leaves in the gap simultaneously, and electric arc disappeared at the zero point of the short circuit current of time T 3.After time T 3, movable part further moves to the Y direction, and the pressure of surge chamber reduces simultaneously, and finishes the action of opening circuit in time T 4.In addition, waveform 24 is the arc duration that electric arc takes place from time T 1 to T3 this section among Figure 31, and waveform 24 is zero after time T 3, and this is because the cause of electric arc disappearance, failure of current.

Minimum arc duration T shown in Figure 31 is arranged on the circuit breaker _MINWith TV university arc duration T _MAXSo-called minimum arc duration T _MIN, be meant that but circuit breaker becomes the minimum time of extinguishing arc state, in the example of Figure 31, the time T 1 that begins to leave from circuit breaker is to minimum arc duration T _MINTill time-amplitude be half period roughly.That is, in time T _MINIn the past, did not fully launch as yet in the gap of leaving of circuit breaker, so can not eliminate electric arc.Thereby shown in waveform 24, in time T 2, even short circuit current becomes zero point, this moment, electric arc can not be eliminated, and arrive next time at zero point, the time of being T3, and short circuit current just is cut off.In addition, so-called maximum arc duration T _MAX, be meant the maximum time that circuit breaker must extinguishing arc, in the example of Figure 31, the time T 1 that begins to leave from circuit breaker is to maximum arc duration T _MAXTill time-amplitude be 1 cycle roughly.In time T _MAX, fully launch in the gap of leaving of circuit breaker, and fixed contact is extracted from insulation nozzle simultaneously, can eliminate electric arc reliably.Thereby shown in waveform 24, at maximum time T _MAXTime T 3 in the past, short circuit current becomes zero point, so can be at time T 3 cutting-off of short-circuit electric currents.In addition, in Figure 31, be to be partial to the moment time T 1 fixedly striking auxiliary contact and the movable striking auxiliary contact disengaging of negative terminal slightly since zero point, but also can begin fixedly striking auxiliary contact and the movably mutual disengaging between the striking auxiliary contact in the various phase places of short circuit current at short circuit current.In addition, the state that Figure 29 represents the fixedly striking auxiliary contact 2 of circuit breaker and movably just begun between the striking auxiliary contact 4 to break away from, Figure 30 represents that then circuit breaker has just passed through maximum arc duration T _MAXState.

Yet the problem of aforesaid conventional apparatus need with large-scale drive unit to be.

That is, in Figure 30, even after the extinguishing arc, if movable part further is moved upward, just can not keep insulation to imposing on the transient recovery voltage that leaves gap 22 in leaving gap 22, scratch start consequently can not cut off electric current once again.Yet along with movable part moving upward, surge chamber 8A dwindles, so the rising of the pressure in the surge chamber 8A.Therefore, can apply counter-force, may make drive unit stop action or make counteragent to connecting direction to drive unit.In order to prevent above-mentioned situation, the past is to make drive unit have enough big actuating force.Thereby need to use large-scale drive unit, cause circuit breaker bulky, the cost height.

The object of the present invention is to provide a kind of circuit breaker that uses small drive device.

To achieve these goals, the present invention is a kind of buffer type gas circuit breaker, fixing striking auxiliary contact, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact with the fixing air exhaust rod of the opposite side of striking auxiliary contact, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds aforementioned surge chamber is packed airtight container into insulating gas in, make by aforementioned movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of aforementioned airtight container, in case clearance order is arranged to be sent, drive unit just make aforementioned movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the aforementioned electric arc that takes place in the gap that leaves, be characterized in, on the aforementioned fixation piston, form from surge chamber one side and penetrate into and the fixing air vent hole of the opposite side of striking auxiliary contact, and before being provided with maximum arc duration when opening circuit aforementioned air vent hole is stopped up, the gas communication control device of after maximum arc duration, aforementioned air vent hole being opened.Like this, the Compressed Gas after the extinguishing arc in the surge chamber is just emitted through the air vent hole of being opened by the gas communication control device, and the pressure in the surge chamber is reduced.Therefore, the counter-force that imposes on drive unit when opening circuit reduces, and can use the drive unit littler than conventional apparatus.

In addition, in said structure, aforementioned gas communication control device can by the peristome of an opposite side that is located at aforementioned air vent hole with surge chamber and be subjected to reinforcing and stop up the breather valve of aforementioned air vent hole all the time and be located at aforementioned breather valve by behind surge chamber one side and the maximum arc duration when opening circuit the pushing member of aforementioned breather valve to the direction pushing that breaks away from the aforementioned fixation piston being constituted.

In addition, in said structure, also open bore and the aforementioned air vent hole that connects the aforementioned fixation piston can be arranged side by side, and aforementioned breather valve is opened aforementioned air vent hole and aforementioned open bore simultaneously.Like this, the pushing member with breather valve under the state of the direction pushing that breaks away from fixed piston, the pushing member passes air vent hole, but the pushing member does not pass open bore, so can utilize open bore to make of equal value increase of sectional area, can make that the pressure in the surge chamber reduces rapidly after the extinguishing arc from the air vent hole of surge chamber.Like this, impose on the counter-force of drive unit in the time of can further reducing to open circuit, can adopt more small-sized drive unit.

In addition, in said structure, also can the periphery of aforementioned air exhaust rod fixing can with the partition wall of aforementioned fixation piston sliding contact, and with this partition wall and aforementioned air exhaust rod and aforementioned fixation piston formation expanding chamber.Like this, Compressed Gas in the surge chamber just is discharged into expanding chamber by air vent hole and open bore, so the increased pressure in the expanding chamber is pushed partition wall and the movable opposite side of striking auxiliary contact to, and movable striking auxiliary contact are left the direction reinforcing in gap to increase.Therefore, the counter-force that puts on drive unit when opening circuit reduces, and can adopt more small-sized drive unit.

In addition, the present invention is a kind of buffer type gas circuit breaker, fixing striking auxiliary contact, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact with the fixing air exhaust rod of the opposite side of striking auxiliary contact, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds aforementioned surge chamber is packed airtight container into insulating gas in, make by aforementioned movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of aforementioned airtight container, in case clearance order is arranged to be sent, drive unit just make aforementioned movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the aforementioned electric arc that takes place in the gap that leaves, be characterized in, on aforementioned air exhaust rod, form with aforementioned and leave the steam vent that the gap is communicated with, and the periphery setting of aforementioned air exhaust rod can with the partition wall of aforementioned fixation piston sliding contact, simultaneously with this partition wall and aforementioned air exhaust rod and aforementioned fixation piston formation expanding chamber, be communicated with aforementioned steam vent near making the minimum arc duration of this expanding chamber when opening circuit, like this, near minimum arc duration, flow to expanding chamber from the high temperature and high pressure gas that leaves the gap through steam vent, like this, because the air pressure of expanding chamber raises, so partition wall is pushed to and the movable opposite side of striking auxiliary contact, and movable striking auxiliary contact are left the direction reinforcing in gap to increase.Therefore, the counter-force that imposes on drive unit when opening circuit reduces, and can use the drive unit littler than the past.

In addition, the present invention is a kind of buffer type gas circuit breaker, fixing striking auxiliary contact, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact with the fixing air exhaust rod of the opposite side of striking auxiliary contact, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds aforementioned surge chamber is packed airtight container into insulating gas in, make by aforementioned movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of aforementioned airtight container, in case clearance order is arranged to be sent, drive unit just make aforementioned movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the aforementioned electric arc that takes place in the gap that leaves, be characterized in, the periphery setting of aforementioned air exhaust rod can with the partition wall of aforementioned fixation piston sliding contact, simultaneously with this partition wall and aforementioned air exhaust rod and aforementioned fixation piston formation expanding chamber, on the aforementioned fixation piston, form and penetrate into the decompression hole of expanding chamber, and be provided with pressure at aforementioned surge chamber and surpass at least aforementioned and aforementioned decompression hole is opened when leaving the required minimum pressure of gap extinguishing arc from surge chamber, and keep the gas communication control device of aforementioned decompression hole open mode after the maximum arc duration when opening circuit forcibly.Like this, the pressure of surge chamber reaches when leaving the required minimum pressure of gap extinguishing arc when opening circuit, because the Compressed Gas of surge chamber also supplies with to expanding chamber, so the pressure of expanding chamber also begins rising.Therefore, the maximum arc duration of partition wall earlier is pushed to and the movable opposite side of striking auxiliary contact, and the counter-force that imposes on drive unit when opening circuit reduces, and can use the drive unit littler than the past.In addition, because behind maximum arc duration, when reducing, the pressure of surge chamber still keeps the decompression hole open mode, so counter-force can not impose on drive unit when opening circuit.

In addition, in said structure, aforementioned gas communication control device can by be located at aforementioned decompression hole by the peristome of expanding chamber one side and be subjected to the dropping valve that aforementioned decompression hole is stopped up to the reinforcing of surge chamber direction all the time and be located in the aforementioned surge chamber and maximum arc duration when opening circuit after the pushing member of aforementioned dropping valve to the direction pushing that breaks away from the aforementioned fixation piston constituted.

In addition, the present invention is a kind of buffer type gas circuit breaker, fixing striking auxiliary contact, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact with the fixing air exhaust rod of the opposite side of striking auxiliary contact, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds aforementioned surge chamber is packed airtight container into insulating gas in, make by aforementioned movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of aforementioned airtight container, in case clearance order is arranged to be sent, drive unit just make aforementioned movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the aforementioned electric arc that takes place in the gap that leaves, be characterized in, the periphery setting of aforementioned air exhaust rod can with the partition wall of aforementioned fixation piston sliding contact, simultaneously with aforementioned partition wall and aforementioned air exhaust rod and aforementioned fixation piston formation expanding chamber, on the aforementioned fixation piston, form the air vent hole that penetrates into expanding chamber from surge chamber, and make insulating gas begin to flow to expanding chamber by aforementioned air vent hole after minimum arc duration when opening circuit is set from surge chamber, behind maximum arc duration, make the further gas communication control device that increases of insulating gas flow that flows to expanding chamber from surge chamber.Like this, the minimum arc duration of the Compressed Gas when opening circuit in the surge chamber when opening circuit also supplied with to expanding chamber, so the pressure of expanding chamber begins rising.Therefore, just be pushed to and the movable opposite side of striking auxiliary contact from minimum arc duration partition wall, the counter-force that imposes on drive unit when opening circuit is littler, can use the drive unit littler than the past.

In addition, in said structure, aforementioned gas communication control device can by pass aforementioned air vent hole and its by the external diameter of surge chamber one side less than by the vent rod of the external diameter of expanding chamber one side, be installed in vent rod by the breather valve of expanding chamber one side end and be located in the aforementioned surge chamber and minimum arc duration when opening circuit after aforementioned vent rod is constituted to the pushing member that aforementioned breather valve breaks away from the direction pushing of fixed piston.Like this, behind the minimum arc duration when just process opens circuit, the external diameter of vent rod is still bigger, so the gas communication sectional area of air vent hole is less, can control the flow of the interior Compressed Gas of surge chamber to expanding chamber a little.Therefore, can be suppressed at the maximum arc duration rapid situation about descending of surge chamber internal gas pressure in the past.At maximum arc duration, the external diameter of vent rod attenuates, and the gas communication sectional area of air vent hole increases, and the pressure of expanding chamber further rises.Like this, partition wall just is pushed to and the movable opposite side of striking auxiliary contact, and the counter-force that imposes on drive unit when opening circuit reduces, and can use the drive unit littler than the past.

In addition, in said structure, aforementioned air vent hole is made of the 1st air vent hole and the 2nd air vent hole, to the 1st gas communication control device controlled through the circulation of the insulating gas of the 1st air vent hole by the 1st breather valve that is located at aforementioned the 1st air vent hole by expanding chamber one side opening portion, and be located in the aforementioned surge chamber and the minimum arc duration when opening circuit after aforementioned the 1st breather valve is constituted to the 1st pushing portion of the direction pushing that breaks away from fixed piston, to the 2nd gas communication control device controlled through the circulation of the insulating gas of the 2nd air vent hole by the 2nd breather valve that leans on expanding chamber one side opening portion that is located at aforementioned the 2nd air vent hole, and be located in the aforementioned surge chamber and the maximum arc duration when opening circuit after will aforementioned the 2nd breather valve to the 2nd pushing portion formation of the direction pushing that breaks away from fixed piston.When opening circuit like this, behind the minimum arc duration gas communication sectional area of air vent hole be exactly the gas communication sectional area of on the gas communication sectional area of the 1st air vent hole, adding the 2nd air vent hole.Therefore, at maximum arc duration, the gas communication sectional area of air vent hole increases, and the pressure of expanding chamber further rises.Like this, partition wall just is pushed to and the movable opposite side of striking auxiliary contact, and the counter-force that imposes on drive unit when opening circuit reduces, and can use the drive unit littler than the past.

In addition, in said structure, also can on aforementioned air exhaust rod, form and leave the steam vent that the gap is communicated with, and be communicated with aforementioned expanding chamber near making the minimum arc duration of this steam vent when opening circuit with aforementioned.Like this, near minimum arc duration, from the Compressed Gas of the HTHP that leaves the gap just through steam vent and flow to expanding chamber.In case the air pressure of expanding chamber raises, partition wall just is pushed to and the movable opposite side of striking auxiliary contact, and movable part is left the direction reinforcing in gap to increase.Therefore, the counter-force that imposes on drive unit when opening circuit is less, can use the drive unit littler than the past.

In addition, in said structure, also can on aforementioned partition wall unidirectional valve be set, this unidirectional valve just makes insulating gas flow to expanding chamber from free space when only the air pressure in expanding chamber is lower than in the airtight container free space air pressure.Like this, when the initial stage expanding chamber that opens circuit expanded, owing to also do not have sufficient gas to supply with from steam vent, expanding chamber had the tendency that forms negative pressure.Owing to supply with insulating gas from the free space of airtight container to expanding chamber by unidirectional valve, so expanding chamber can not form negative pressure.Therefore, the counter-force that puts on drive unit when opening circuit is littler, can use littler drive unit.

It below is simple declaration to accompanying drawing.

Fig. 1 is the cutaway view of the buffer type gas circuit breaker internal structure of the expression embodiment of the invention.

The cutaway view of Fig. 2 state that to be the expression movable part be moved upward from the state of Fig. 1.

Fig. 3 is the buffer type gas circuit breaker internal structure cutaway view of expression further embodiment of this invention.

Fig. 4 is the X-X line cutaway view of Fig. 3.

Fig. 5 is the Y-Y line cutaway view of Fig. 3.

The cutaway view of Fig. 6 state that to be the expression movable part be moved upward from the state of Fig. 3.

Fig. 7 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

Fig. 8 is the U-U line cutaway view of Fig. 7.

Fig. 9 is the V-V line cutaway view of Fig. 7.

The cutaway view of Figure 10 state that to be the expression movable part be moved upward from the state of Fig. 7.

Figure 11 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 12 state that to be the expression movable part be moved upward from the state of Figure 11.

Figure 13 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 14 state that to be the expression movable part be moved upward from the state of Figure 13.

Figure 15 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 16 state that to be the expression movable part be moved upward from the state of Figure 15.

Figure 17 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 18 state that to be the expression movable part be moved upward from the state of Figure 17.

Figure 19 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 20 state that to be the expression movable part be moved upward from the state of Figure 19.

Figure 21 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 22 state that to be the expression movable part be moved upward from the state of Figure 21.

Figure 23 is the buffer type gas circuit breaker internal structure cutaway view of expression yet another embodiment of the invention.

The cutaway view of Figure 24 state that to be the expression movable part be moved upward from the state of Figure 23.

Figure 25 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, state when wherein (A) expression circuit breaker has just left, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.

Figure 26 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, wherein (A) represents the state that just leaves of circuit breaker, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.

Figure 27 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, wherein (A) represents the state that just leaves of circuit breaker, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.

Figure 28 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, wherein (A) represents the state that just leaves of circuit breaker, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.

Figure 29 is the cutaway view of the traditional buffer type gas circuit breaker internal structure of expression.

The cutaway view of Figure 30 state that to be the expression movable part be moved upward from the state of Figure 29.

Figure 31 is the performance diagram of when action characteristic that opens circuit of the device of expression Figure 29.

Figure 32 is the performance diagram of when action characteristic that opens circuit of the device of expression Figure 17.

Figure 33 is the performance diagram of when action characteristic that opens circuit of the device of expression Figure 23.

Figure 34 is the performance diagram of when action characteristic that opens circuit of the device of expression Figure 25.

Figure 35 is the performance diagram of the drive unit of the device of expression Figure 25 power that movable part is drawn to the direction that opens circuit.

Figure 36 is the performance diagram of when action characteristic that opens circuit of the device of expression Figure 26.

Figure 37 is the performance diagram of the drive unit of the device of expression Figure 26 power that movable part is attracted to the direction that opens circuit.

Below in conjunction with embodiment the present invention is described.Fig. 1 is the cutaway view of the buffer type gas circuit breaker internal structure of the expression embodiment of the invention, the state when the expression circuit breaker has just left.On fixed piston 11, form the air vent hole 27 that connects upward from surge chamber 8A, be provided with by tension spring 29 all the time to the breather valve 25 that stops up the direction reinforcing in the upper opening portion of this air vent hole 27.On the other hand, the push strut 23 that can pass this breather valve 27 is stretched out to air vent hole 27 from the downside of surge chamber 8A.Other structures of Fig. 1 are identical with the traditional structure of Figure 29, and all parts identical with traditional structure are represented and detailed with same-sign.

The cutaway view of Fig. 2 state that to be the expression movable part be moved upward from the state of Fig. 1, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A dwindles more, leaves gap 22 simultaneously and enlarges more, and the electric arc that leaves gap 22 disappears.In addition, push strut 23 is passed air vent hole 27 and breather valve 25 is pushed upward, and breather valve 25 is opened.That is, as shown in Figure 1, when when leaving gap 22 generation electric arcs 20, breather valve 25 utilizes the reinforcing of spring 29 that surge chamber 8A is stopped up, and as shown in Figure 2, in case through maximum arc duration T _MAXAnd leaving the electric arc disappearance that gap 22 takes place, push strut 23 just pushes breather valve 25, and this breather valve 25 is opened.Because breather valve 25 is opened, the Compressed Gas in the surge chamber 8A is emitted to the free space 33 of airtight container as shown by arrow A.Therefore, the pressure in the surge chamber 8A reduces, and the counter-force that movable part be back into the below reduces.Thereby, can use the drive unit littler than the past.

The characteristic of Fig. 1 device also shows in the performance diagram of Figure 31.The movable part position that the characteristic 52S presentation graphs of representing with chain-dotted line 1 installs, the pressure of the surge chamber 8A of characteristic 52P presentation graphs 1 device that chain-dotted line is represented rises.Characteristic 52S and characteristic 52P are at maximum arc duration T _MAXIdentical with characteristic 51S and characteristic 51P respectively before.In case at maximum arc duration T _MAXOpen breather valve, after this just shown in characteristic 52P, the pressure in the surge chamber rises and is suppressed than the occasion of characteristic 51P, and meanwhile, shown in characteristic 52S, moving than the occasion of characteristic 51S of movable part accelerated.This difference will make the counter-force that puts on the drive unit than relaxing in the past.In addition, why at maximum arc duration T _MAXOpen breather valve afterwards,, the pressure in the surge chamber is reduced even be because moving contact and fixed contact begin to leave in any phase place of short circuit current.

Fig. 3 is the buffer type gas circuit breaker internal structure cutaway view of expression further embodiment of this invention, the state when the expression circuit breaker has just left.Upper end at the vent rod 45 that passes air vent hole 42 is fixed with breather valve 43, in the bottom of breather valve 45 spring base 46 is arranged.Clamp shape compressibility spring 44 between spring base 46 and the fixed piston 11.44 pairs of breather valves 43 of spring are afterburning downwards all the time, and the top peristome of air vent hole 42 stops up.In addition, the downside at surge chamber 8A protrudes the abutting part 47 that is provided with the spring base butt.Other structures of Fig. 3 are then identical with Fig. 1.

Fig. 4 is the X-X cutaway view of Fig. 3, and Fig. 5 is the Y-Y cutaway view of Fig. 3.In Fig. 4, on fixed piston 11, have a plurality of air vent holes 42, vent rod 45 passes each air vent hole 42.In Fig. 5, be provided with a plurality of breather valves 43 that each air vent hole is stopped up.

The cutaway view of Fig. 6 state that to be the expression movable part be moved upward from the state of Fig. 3, the expression circuit breaker has just passed through maximum arc duration T _MAXAfter state.Surge chamber 8A dwindles more, leaves gap 22 simultaneously and enlarges more, and the electric arc that leaves 22 places, gap disappears.In addition, because spring base 46 and abutting part 47 butts upwards push away vent rod 45, breather valve 43 is opened air vent hole 43.That is, as shown in Figure 3, when leaving 22 places, gap generation electric arc 20, breather valve 43 stops up surge chamber 8A owing to the reinforcing of spring 44, but as shown in Figure 6, in case through maximum arc duration T _MAXAnd leaving the electric arc that 22 places, gap take place, breather valve 43 is promptly opened, and the Compressed Gas in the surge chamber 8A is emitted to the free space 33 of airtight container as shown by arrow A.Therefore, the pressure in the surge chamber 8A reduces, and the counter-force that movable part be back into the below reduces.Thereby, can use the drive unit littler than the past.In addition, the characteristic of this circuit breaker is identical with characteristic 52P, the 52S of Figure 31.

Though the mounting structure of the breather valve 25 of Fig. 1 and the breather valve 43 of Fig. 3 is slightly different, the pressure in making surge chamber 8A has same effect when reducing.In addition, about the obturation of air vent hole among control chart 1, Fig. 2 27,42 and the gas communication control device of opening, general as long as adopt circuit breaker at the maximum arc duration T of process _MAXAfter immediately the Compressed Gas of surge chamber 8A is put into free space 33 structure get final product, not necessarily leave no choice but structure with Fig. 1 or Fig. 3.

In addition, not necessarily to leave no choice but be convex shape to the abutting part among Fig. 3 47.Also can make vent rod 43 longer than Fig. 3, and with the inwall downside of surge chamber 8A as abutting part, make the inwall downside butt of spring base 46 and surge chamber 8A.But,, just be difficult for stably supporting vent rod 45 in case prolong vent rod 45.In addition, the inwall downside of surge chamber 8A also can be in the position of top more than Fig. 3, but can dwindle the internal volume of surge chamber 8A like this, can not guarantee enough compressed gas scale of constructions.By abutting part 47 being made the such lug boss of Fig. 3 from buffering chamber interior walls protrusion, just need not to prolong vent rod 45, can stably support vent rod 45.In addition, lug boss is set like this, can dwindle the internal volume of surge chamber 8A, can guarantee enough compressed gas scale of constructions, improve the release property of circuit breaker.Also have, can regulate its position and height of projection simply to this lug boss, so be easy to set opening period of breather valve 43, its making also is easy to.In addition, the position that is provided with of abutting part 47 also can be different with Fig. 3, promptly are arranged on surge chamber 8A inwall downside by air exhaust rod 7 one sides.In addition, abutting part 47 also can not be located in the corner of surge chamber 8A, but protrudes setting from the outer peripheral face of air exhaust rod 7 or the inner peripheral surface of surge chamber 8A.Be provided with if abutting part protrudes from air exhaust rod 7, its radius is less, so abutting part can guarantee the more compressed gas scale of construction in the inner shared volume reducing of surge chamber 8A.

Fig. 7 is the cutaway view of the buffer gas formula circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.Shape is for the open bore 42A that has air vent hole 42 that vent rod 45 passes and no bar to pass side by side on fixed piston 11, and the breather valve 48 of ring-type is mounted to the state that air vent hole 42 and open bore 42A can be stopped up simultaneously.Other structures of Fig. 7 are identical with Fig. 3.

Fig. 8 is the U-U cutaway view of Fig. 7, and Fig. 9 is the V-V cutaway view of Fig. 7.In Fig. 8, air vent hole 42 and open bore 42A arrange along the circle alternate of fixed piston 11, have vent rod 45 to pass in the air vent hole 42, and 42 no bars of open bore pass.In Fig. 9, air vent hole and open bore are stopped up simultaneously with a breather valve 48.

The cutaway view of Figure 10 state that to be the expression movable part be moved upward from the state of Fig. 7, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.In case through maximum arc duration T _MAXAnd leaving the electric arc disappearance that 22 places, gap take place, vent rod 45 just pushes breather valve 48, and breather valve 48 is opened.Because breather valve 48 is opened, the Compressed Gas in the surge chamber 8A is emitted to the free space 33 of airtight container promptly as shown by arrow A, and this point and Fig. 6 are identical.Owing to form the open bore 42A that does not have vent rod 45 to pass, event promptly increases because of open bore 42A from the sectional area of the air vent hole 42 of surge chamber 8A of equal valuely, can increase the gas communication sectional area between surge chamber 8A and the free space 33, make that the pressure in the surge chamber 8A reduces rapidly after the extinguishing arc.

In addition, if on fixed piston 11, only be provided with the air vent hole 42 that vent rod 45 passes, for the pressure in the surge chamber 8A after the extinguishing arc is reduced with enough fast speed, will guarantee that the gas communication sectional area between surge chamber 8A and the free space 33 reaches the area of regulation, therefore to enlarge the width of fixed piston 11, be unfavorable for dwindling the external diameter of circuit breaker like this at radial direction.If establish open bore 42A and on fixed piston 11, promptly establish air vent hole 42, even do not enlarge the aperture of air vent hole 42 and open bore 42A, also can increase the gas communication sectional area between surge chamber 8A and the free space 33 effectively, so there is not the factor that influences the miniaturization of circuit breaker external diameter, promptly, needn't to guarantee that thereby the area that gas communication sectional area between surge chamber 8A and the free space 33 reaches regulation enlarges the width of fixed piston 11 at radial direction, can realize the miniaturization of circuit breaker external diameter because reducing the pressure in the surge chamber 8A after the extinguishing arc as early as possible.

In addition, the breather valve 48 of ring-type also is applicable to the embodiment of Fig. 1.That is, in Fig. 1, also breather valve 25 can be done circlewise, and along alternately passing push strut 23 in the air vent hole 27 of a plurality of perforations of the circumferential arrangement of fixed piston 11.Like this, can omit the quantity of push strut 23, and can increase the total sectional area of air vent hole 27, increase the gas communication sectional area between surge chamber 8A and the free space 33, so can promptly reduce the pressure in the surge chamber 8A.

In addition, in this occasion, even do not increase the aperture of air vent hole 27, also can increase the gas communication sectional area between surge chamber 8A and the free space 33 effectively, therefore can there be the factor that influences the miniaturization of circuit breaker external diameter, promptly, needn't to guarantee that thereby the area that gas communication sectional area between surge chamber 8A and the free space 33 reaches regulation enlarges the width of fixed piston 11 at radial direction, can realize the miniaturization of circuit breaker external diameter because reducing the pressure in the surge chamber 8A after the extinguishing arc as early as possible.

Figure 11 is the cutaway view of internal structure of the buffer type gas circuit breaker of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.Periphery protrusion in air exhaust rod 7 is provided with partition wall 31, the front end face of outer footpath one side of this partition wall 31 and the fixed part 10A sliding contact of fixed piston 10.Thereby, between this partition wall 31 and fixed piston 10, air exhaust rod 7, form expanding chamber 30.On the other hand, the bottom of the steam vent 7A of air exhaust rod 7 is communicated with the through hole 4A of movable striking auxiliary contact 4.Then be fixed across open pore 7B piston 10 of the upper end of steam vent 7A stops up.

The cutaway view of Figure 12 state that to be the expression movable part move up from the state of Figure 11, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A dwindles more, and open pore 7B is moved upward and opens wide to expanding chamber 30 simultaneously.Open pore 7B is minimum arc duration T at circuit breaker to expanding chamber 30 unlimited _MINCarry out.Other structures of Figure 11 and Figure 12 are identical with Figure 29 and traditional structure shown in Figure 30 respectively.As shown in figure 11, opening circuit the initial stage, be fixed piston 10 of the open pore 7B of air exhaust rod 7 stops up, and at the minimum arc duration T of circuit breaker _MIN, shown in the arrow C of Figure 12, flow into expanding chamber 30 through steam vent 7A and open pore 7B from the Compressed Gas of the HTHP that leaves gap 22.Like this, the pressure of expanding chamber 30 just raises, and the power that partition wall 31 is pushed away upward takes place.Therefore, the counter-force that movable part be pushed back downwards can be used the drive unit littler than the past than in the past little.

Figure 13 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.Unidirectional valve 40 is located at the peristome by expanding chamber one side of the suction hole 31A that connects partition wall 31.This unidirectional valve 40 is provided with the carriage release lever 40A that connects suction hole 31A, in the upper end of carriage release lever 40A board 40B is housed simultaneously.Clamped compressibility spring 41 between board 40B and the partition wall 31, unidirectional valve 40 is subjected to reinforcing and all the time suction hole 31A is stopped up.When the air pressure in expanding chamber in 30 was lower than the air pressure of free space 30 of airtight container, the pressure reduction that expanding chamber 30 and free space are 33 made unidirectional valve 40 stressed and with these spring 41 compressions.Like this, unidirectional valve 40 just downwards, promptly the direction to disengaging partition wall 31 moves, and as shown by arrow D, insulating gas flows to expanding chamber 30 from free space 33, makes expanding chamber 30 relative free spaces 33 not form negative pressure.

The cutaway view of Figure 14 state that to be the expression movable part be moved upward from the state of Figure 13, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Because insulating gas flows out from air exhaust rod 7 as shown by arrow C, the pressure in the expanding chamber 30 is raise, unidirectional valve 40 is upwards pushed away.Like this, unidirectional valve 40 just stops up suction hole 31A, prevents that the insulating gas in the expanding chamber 30 from leaking to free space 33.Other structures of Figure 13 and Figure 14 are identical with Figure 11 and Figure 12 respectively.

In Figure 13, opening circuit the initial stage, also not from steam vent 7A supply insulating gas the time, expanding chamber 30 just expands, so expanding chamber 30 relative free spaces 33 have the tendency that forms negative pressure.Owing to supply with insulating gas from the free space 33 of airtight container to expanding chamber 30 with unidirectional valve, at the expansion initial stage of expanding chamber 30, expanding chamber 30 does not have the negative pressure tendency.In the moment that electric arc 20 disappears, supply with insulating gas from steam vent 7A, the pressure of expanding chamber 30 is raise, so as shown in figure 14, unidirectional valve 40 stops up suction hole.Therefore, the counter-force that imposes on drive unit when opening circuit reduces, and can use small-sized drive unit.

Figure 15 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.On partition wall 31, form the hole 31A that passes for carriage release lever 40A, form the complementary apertures 31B that no bar passes abreast with this suction hole 31A simultaneously.Unidirectional valve 50 is done circlewise, and suction hole 31A and complementary apertures 31B can be stopped up simultaneously.Suction hole 31A and complementary apertures 31B and air vent hole 42 shown in Figure 8 are same, are a plurality ofly to be arranged in circle-shapedly, and have carriage release lever 40A alternately to pass wherein.In addition, unidirectional valve 50 is also done circlewise equally with breather valve 48 shown in Figure 8, and can simultaneously all suction hole 31A and complementary apertures 31B be opened and closed.

The cutaway view of Figure 16 state that to be the expression movable part be moved upward from the state of Figure 15, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Because insulating gas flows out from air exhaust rod 7 as shown by arrow C, the pressure in the expanding chamber 30 is raise, unidirectional valve 50 is upwards pushed away.Like this, unidirectional valve 50 just stops up suction hole 31A and complementary apertures 31B, prevents that the insulating gas in the expanding chamber 30 from leaking to free space 33.Other structures of Figure 15 and Figure 16 are identical with Figure 13 and Figure 14 respectively.

Return Figure 15 again, owing to formed the complementary apertures 31 that no carriage release lever 40A passes, so available complementary apertures 31B increases the sectional area of suction hole 31A of equal valuely.Like this, can increase the gas communication sectional area of 33 of expanding chamber 30 and free spaces, and eliminate the pressure reduction between expanding chamber 30 and the free space 33 rapidly.In addition, even do not increase the aperture of suction hole 31A and complementary apertures 31B, also can increase the gas communication sectional area of 33 of expanding chamber 30 and free spaces effectively, therefore there is not the factor that influences the miniaturization of circuit breaker external diameter, promptly, needn't to guarantee that thereby aforementioned gas communication sectional area reaches the width of the area expansion partition wall 31 of regulation at radial direction, can realize the miniaturization of circuit breaker external diameter because eliminating the pressure differential between expanding chamber 30 and the free space 33 as early as possible.

Figure 17 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.Periphery protrusion in air exhaust rod 61 is provided with partition wall 31, the front end face of outer footpath one side of this partition wall 31 and the fixed part 11A sliding contact of fixed piston 11.Therefore, between this partition wall 31 and fixed piston 11 and air exhaust rod 61, form expanding chamber 30.On the other hand, the upper end of the steam vent 61A of air exhaust rod 61 is opened wide to free space 33 across open pore 61B.

The cutaway view of Figure 18 state that to be the expression movable part be moved upward from the state of Figure 17, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A dwindles more, leaves gap 22 simultaneously and also enlarges more, and the electric arc that leaves 22 places, gap disappears.Other structures of Figure 17 and Figure 18 are identical with Fig. 3 and Fig. 6 respectively.

In Figure 17, at the maximum arc duration T of process _MAXAfter, because the insulating gas in the surge chamber 8A is blown into the expanding chamber 30 of sealing by breather valve 43, so the rising of the pressure in the expanding chamber 30.Therefore, partition wall 31 is upwards pushed away, the counter-force that imposes on drive unit when opening circuit is littler, can use more small-sized drive unit.

Figure 32 is the open circuit performance diagram of when action characteristic of the device of expression Figure 17.Transverse axis express time, the longitudinal axis represent that the pressure of position, surge chamber or the expanding chamber of electric current, movable part rises.Waveform 57 expressions flow into the short circuit current of Figure 17 device from alternating current circuit, the characteristic 54S that chain-dotted line is represented represents the position of the movable part of Figure 17 device, the characteristic 54P that chain-dotted line is represented represents that the pressure of the surge chamber 8A of Figure 17 device rises, and the characteristic 54Q that chain-dotted line is represented represents that the pressure of the expanding chamber 30 of Figure 17 device rises.In order to compare, in Figure 32, also express the characteristic of the conventional apparatus of Figure 29.That is, the characteristic 53S that solid line is represented represents the position of the movable part of Figure 29 device, and the characteristic 53P that solid line is represented represents that the pressure of the surge chamber of Figure 29 device rises.In addition, characteristic 51S among Figure 31 and the characteristic 53S among Figure 32 and the characteristic 51P among Figure 31 and the characteristic 52P among Figure 32 are essentially identical waveforms, and just the AC wave shape phase place on the time T 0 after clearance order is sent is slightly different.So in the explanation of this omission to characteristic 53S and characteristic 53P.

In Figure 32, the device of Figure 17 is shown in characteristic 54Q, from maximum arc duration T _MAXAfter, the pressure of expanding chamber 30 rises.At this moment because preceding described, be the insulating gas of surge chamber enters into expanding chamber by air vent hole cause.Because the pressure of expanding chamber rises, the counter-force that imposes on drive unit is littler, and shown in characteristic 54S, movable part is than conventional apparatus in-position Y quickly.But, the breather valve among Figure 17 also can be the breather valve 25 among Fig. 1.

Figure 19 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.Periphery protrusion in air exhaust rod 7 is provided with partition wall 31, the front end face of outer footpath one side of this partition wall 31 and the fixed part 11A sliding contact of fixed piston 11.Therefore, between this partition wall 31 and fixed piston 11, form expanding chamber 30.On the other hand, be fixed piston 11 of the open pore 7B of air exhaust rod 7 stops up.

The cutaway view of Figure 20 state that to be the expression movable part be moved upward from the state of Figure 19, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A dwindles more, leaves gap 22 simultaneously and also enlarges more, and the electric arc that leaves 22 places, gap disappears.On the other hand, the open pore 7B of air exhaust rod 7 opens wide at expanding chamber 30, and as shown by arrow B, produces by boasting from the insulating gas of the steam vent 7A of air exhaust rod 7 from this weapon hole 7B.Used 11 illustrated the unlimited period of open pore 7B as figure, be minimum arc duration T _MINOther structures of Figure 19 and Figure 20 are identical with Fig. 1 and Fig. 2 respectively.

In Figure 19, compare with Figure 17, increased insulating gas, so the pressure rising De Genggao of expanding chamber 30 from air exhaust rod 7.Like this, the counter-force that imposes on drive unit when opening circuit is littler, can use more small-sized drive unit.

Figure 21 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.The cutaway view of Figure 22 state that to be the expression movable part be moved upward from the state of Figure 21, the expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.The difference of Figure 21 and Figure 22 and Figure 19 and Figure 20 only is that breather valve 25 has changed breather valve 43 into, and other structures are then identical.Thereby, if the breather valve 25 in Figure 19 structure open period (maximum arc duration T _MAX) and (the minimum arc duration T in unlimited period of open pore 7B _MIN) with the structure of Figure 21 in breather valve 43 open period (maximum arc duration T _MAX) and (the minimum arc duration T in unlimited period of open pore 7B _MIN) identical respectively, then the characteristic of Figure 19 and Figure 21 is identical.The characteristic of Figure 21 device also shows in the performance diagram of Figure 32.The characteristic 55Q that double dot dash line is represented represents that the pressure of the expanding chamber 30 of Figure 21 rises, and the characteristic 55S that double dot dash line is represented represents the position of the movable part of Figure 21.Shown in characteristic 55Q, from minimum arc duration T _MINRise, the pressure of expanding chamber 30 begins to rise, and compares with the device of not supplying with from the insulating gas of air exhaust rod (characteristic 54Q) of Figure 17, and the pressure of expanding chamber 30 rises higher.Correspondingly, the counter-force that imposes on drive unit is littler, so from minimum arc duration T _MINRise, the speed of movable part is shown in characteristic 55S, and is faster than the device (characteristic 54S) of Figure 17.Thereby can use more small-sized drive unit.

Figure 23 is the cutaway view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, the state when the expression circuit breaker has just left.The cutaway view of Figure 24 state that to be the expression movable part be moved upward from the state of Figure 23.Figure 23 and Figure 24 are provided with the unidirectional valve identical with Figure 13 40 with the suction hole 31A place that the difference of Figure 21 and Figure 22 only is at partition wall 31.Other structures of Figure 23, Figure 24 are identical with Figure 21, Figure 22 respectively.In the structure of Figure 21, in opening circuit the initial stage that expanding chamber 30 expands, owing to also do not supply with sufficient insulating gas from steam vent 7A, expanding chamber 30 relative free spaces 33 have the tendency that forms negative pressure.And in the structure of Figure 23, owing to supply with insulating gas from the free space 33 of airtight container to expanding chamber 30 by unidirectional valve 40, so expanding chamber 30 can not form negative pressure.In the moment that electric arc 20 disappears, the pressure of expanding chamber 30 raises, so as shown in figure 24, unidirectional valve 40 stops up suction hole 31A.Therefore, the counter-force that imposes on drive unit when opening circuit is littler, can use more small-sized drive unit.

Figure 33 is the performance diagram of Figure 23 device.Transverse axis is represented minimum arc duration T _MINAnd maximum arc duration T _MAXNear time, the longitudinal axis of last figure is represented the pressure rising of expanding chamber 30, the longitudinal axis of middle figure is represented the operating physical force of drive unit self, the longitudinal axis of figure below is represented drive unit draws power from movable part to the direction that opens circuit, the top of each longitudinal axis is for just.The chopper phase of short circuit current is identical with waveform 57 among Figure 32 among Figure 33.In the last figure of Figure 33, the characteristic 56Q that solid line is represented represents that the pressure of the expanding chamber 30 of Figure 23 device rises.In order to compare, in the last figure of Figure 33, also express the characteristic 55Q of Figure 21 device and the characteristic 54Q of Figure 17 device.In addition, in the middle figure of Figure 33, the operating physical force of characteristic 60 expression drive units is the power of movable part being drawn to the disconnection direction by the electronic spring that saves up strength.In figure below of Figure 33, the characteristic 56C that solid line is represented is the drive unit of Figure 23 device draws a power from movable part to the disconnection direction.In order to compare, in figure below of Figure 33, also express the characteristic 55 of Figure 21 device and the characteristic 54C of Figure 17 device.

In the last figure of Figure 33, characteristic 55Q and characteristic 54Q are because expanding chamber along with the action of movable part is expanded simultaneously, so as previously mentioned, has the tendency that forms negative pressure at the disconnection initial stage.Characteristic 56Q has then replenished insulating gas from free space by clamping unidirectional valve, so can not form negative pressure.Therefore, characteristic 56Q is at maximum arc duration T _MAXAfter the pressure rising value be higher than characteristic 55Q and characteristic 54Q.In the middle figure of Figure 33, characteristic 60 is owing to the general character of spring self, and along with movable part advances to the direction that opens circuit, its operating physical force weakens.In figure below of Figure 33, characteristic 56C is at minimum arc duration T _MINAfter, the degree that the pressure rising of expanding chamber weakens the drive unit pulling force relaxes to some extent.In addition, characteristic 56C is at maximum arc duration T _MAXAfter, the pulling force of drive unit rises along with the pressure of expanding chamber and increases, and in time T 5, reaches peak value along with the pressure of expanding chamber rises, and the pulling force of drive unit also reaches peak value.Therefore, maximum arc duration T _MAXAfter, even the operating physical force of drive unit self weakens, the power that movable part is drawn to the direction that opens circuit can too not weaken yet.Characteristic 56C is owing to the pressure height of expanding chamber, and force rate characteristic 55C and characteristic 54C that movable part is drawn to the direction that opens circuit are big.In addition, characteristic 55C and characteristic 54C have a pulling force to the direction that opens circuit to become the time period of negative polarity, but because movable part has the acceleration when mobile, so movable part can not stop in this time period.

Figure 25 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, state when wherein (A) expression circuit breaker has just left, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.In Figure 25 (A), on fixed piston 11, form the vent 63 that penetrates into expanding chamber 30 from surge chamber 8A, be subjected to reinforcing and the pressure-reducing valve 64 that will all the time this vent 63 be stopped up be located at the peristome by expanding chamber 30 1 sides of this vent 63.The decompression lever 62 that passes vent 63 is housed on the pressure-reducing valve 64, and the left end of this decompression lever 62 is fixed with spring base 72, clamps compressibility spring 61 between spring base 72 and fixed piston 11.In addition, the internal face of surge chamber 8A protrude be provided with can with the abutting part 80 of spring base 72 butts.Other structures of Figure 25 (A) are identical with Figure 21.But, movable striking auxiliary contact 4 movable parts such as grade of the circuit breaker of Figure 25 (A) are move left and right.Pressure-reducing valve 64 surpasses the pressure rising value P0 of regulation, promptly surpasses to eliminate when leaving the required minimum pressure rising value of electric arc that the gap takes place and open in the inside of surge chamber 8A.The pressure of surge chamber 8A is by vent 63 pushing pressure-reducing valves 64, so by selecting the spring 61 of suitable intensity, open pressure-reducing valve 64 with regard to available authorized pressure P0.

The inside of Figure 25 (B) expression surge chamber 8A becomes authorized pressure P0, the state when pressure-reducing valve 64 has just been opened.Compressed Gas in the surge chamber 8A is by vent 63 and as shown by arrow E like that to expanding chamber 30 outflows, and the pressure of expanding chamber 30 begins to rise.

Figure 25 (C) expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A is further compressed, spring base 72 and abutting part 80 butts, make pressure-reducing valve 64 more to right-hand, promptly move to the direction that breaks away from fixed piston 11, and as shown by arrow F, Compressed Gas flows out to expanding chamber 30.

Figure 34 is the performance diagram of the characteristic of expression Figure 25 device when opening circuit action.Transverse axis express time, the longitudinal axis represent that the pressure of position, surge chamber or the expanding chamber of electric current, movable part rises.Waveform 57 expressions flow into the short circuit current of Figure 25 device from alternating current circuit, the characteristic 62S that chain-dotted line is represented represents the position of the movable part of Figure 25 device, the characteristic 62P that chain-dotted line is represented represents that the pressure of the surge chamber 8A of Figure 25 device rises, and the characteristic 62Q that chain-dotted line is represented represents that the pressure of the expanding chamber 30 of Figure 25 device rises.In order to compare, in Figure 34, also express the characteristic of Figure 21 device.That is, the characteristic 55S that solid line is represented represents the position of the movable part of Figure 21 device, and the characteristic 55P that solid line is represented represents that the pressure of the surge chamber 8A of Figure 21 device rises, and the characteristic 55Q that solid line is represented represents that the pressure of the expanding chamber 30 of Figure 21 device rises.

In Figure 34, the pressure of the surge chamber 8A of the device of Figure 25 rises becomes the pressure rising value P0 of regulation when time T 6, so pressure-reducing valve 64 is opened.Therefore, the characteristic 62P that the pressure of expression surge chamber 8A rises is sharply crooked in time T 6, fails to rise to the degree of characteristic 55P.And at maximum arc duration T _MAXAfter, decompression lever of pressure-reducing valve 64 62 and abutting part 80 butts, so even the pressure rising value of surge chamber 8A below P0, pressure-reducing valve 64 still stays open state.Therefore, time T _MAXThe pressure of later surge chamber 8A rises and just descends like that gradually shown in characteristic 62P.And from time T 6, Compressed Gas flows into expanding chamber 30 from surge chamber 8A, so the pressure rising value of expanding chamber 30 such fast rise shown in characteristic 62Q just.Thereby the counter-force that imposes on drive unit reduces, and movable part is shown in characteristic 62S, and specific characteristic 55S is in-position Y more early.

Figure 35 is the performance diagram of the drive unit of expression Figure 25 device power that movable part is drawn to the direction that opens circuit.The transverse axis express time, vertical power of movable part being drawn to the direction that opens circuit with the expression drive unit, the top is for just.The characteristic 62C that chain-dotted line is represented represents the drive unit of Figure 25 device draws power from movable part to the direction that opens circuit, in order to compare, also expresses the characteristic 55C (solid line) of Figure 21 device.Characteristic 62C is after time T 6, and the pressure rising along with expanding chamber 30 pulls to movable part the occasion of the power of the direction that opens circuit greater than characteristic 55C.Therefore, the device of Figure 25 can use the drive unit littler than Figure 21.In addition, to the obstruction of decompression hole among Figure 25 63 with open the gas communication control device of carrying out control and not necessarily leave no choice but constitute by dropping valve shown in Figure 25 64 and abutting part 80 etc., so long as can surpass at least at the pressure of surge chamber 8A make when leaving the required minimum pressure of gap extinguishing arc decompression hole 63 open and the maximum arc duration when opening circuit after keep decompression hole 63 open modes forcibly structure get final product.

Figure 26 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, state when wherein (A) expression circuit breaker has just left, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.In Figure 26 (A), on fixed piston 11, form the air vent hole 67 that penetrates into expanding chamber 30 from surge chamber 8A, be subjected to reinforcing and the breather valve 68 that will all the time this air vent hole 67 be stopped up be located at the peristome by expanding chamber 30 1 sides of this air vent hole 67.The vent rod 66 that passes air vent hole 67 is housed on the breather valve 68, is fixed with spring base 72, between spring base 72 and fixed piston 11, clamp compressibility spring 65 at the left end of this vent rod 66.The right side of vent rod 66, promptly from surge chamber 8A towards expanding chamber 30, its external diameter increases slightly gradually.In addition, the internal face of surge chamber 8A protrude be provided with can with the abutting part 80 of spring base 72 butts.Other structures of Figure 26 (A) are identical with Figure 25 (A).。

Figure 26 (B) expression movable part moves right and circuit breaker has just passed through minimum arc duration T _MINThe time state, spring base 72 and abutting part 80 butts, breather valve 68 are pushed to the direction that breaks away from piston 11, thereby air vent hole 67 is opened.Compressed Gas in the surge chamber 8A is by air vent hole 67 and as shown by arrow G like that to expanding chamber 30 outflows, and the pressure of expanding chamber 30 begins to rise.But,, suppressed to flow through the compressed gas flow of air vent hole 67 so that Compressed Gas flows through the gas communication sectional area of air vent hole 67 is little because the particle size of vent rod 66 part also is in the air vent hole 67.Therefore,, do not cause the pressure of surge chamber 8A to reduce, guaranteed to have in the surge chamber 8A enough pressure to be used to eliminate and left the electric arc that the gap takes place though the pressure of expanding chamber 30 rises.

Figure 26 (C) expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Along with the process of time, surge chamber 8A is further compressed, spring base 72 and abutting part 80 butts, make breather valve 68 more to right-hand, promptly move to the direction that breaks away from fixed piston 11, and as shown by arrow I, Compressed Gas flows out to expanding chamber 30.In this occasion, because the small diameter part branch of vent rod 66 is in the air vent hole 67,, Compressed Gas increases so flowing through the gas communication sectional area of air vent hole 67, the compressed gas flow that flows through air vent hole 67 increases.

Figure 36 is the performance diagram of the characteristic of expression Figure 26 device when opening circuit action.Transverse axis express time, the longitudinal axis represent that the pressure of position, surge chamber or the expanding chamber of electric current, movable part rises.Waveform 57 expressions flow into the short circuit current of Figure 25 device from alternating current circuit, the characteristic 61S that chain-dotted line is represented represents the position of the movable part of Figure 26 device, the characteristic 61P that chain-dotted line is represented represents that the pressure of the surge chamber 8A of Figure 26 device rises, and the characteristic 61Q that chain-dotted line is represented represents that the pressure of the expanding chamber 30 of Figure 26 device rises.In order to compare, in Figure 36, also express the characteristic of Figure 21 device.That is, the characteristic 55S that solid line is represented represents the position of the movable part of Figure 21 device, and the characteristic 55P that solid line is represented represents that the pressure of the surge chamber 8A of Figure 21 device rises, and the characteristic 55Q that solid line is represented represents that the pressure of the expanding chamber 30 of Figure 21 device rises.

In Figure 36, the minimum arc duration T of the device of Figure 26 when opening circuit _MINAfterwards, Compressed Gas flows into expanding chamber 30 from surge chamber 8A through vent rod 67, but because the gas communication sectional area of air vent hole 67 is little, its flow is controlled in minimum flow, so the pressure of surge chamber 8A rises shown in characteristic 61P, does not rise to the degree of characteristic 55P, therefore, the pressure of expanding chamber 30 rises shown in characteristic 61Q, and specific characteristic 55Q rises quickly.On the other hand, at maximum arc duration T _MAXAfter, the gas communication sectional area of air vent hole 67 increases, so the amount that flows into the Compressed Gas of expanding chamber 30 from surge chamber 8A increase, shown in characteristic 61Q, the raising of rising of the pressure of expanding chamber 30.Thereby the counter-force that imposes on drive unit reduces, and movable part is shown in characteristic 61S, and specific characteristic 55S is in-position Y earlier.

Figure 37 is the performance diagram of the drive unit of expression Figure 26 device power that movable part is drawn to the direction that opens circuit.The transverse axis express time, vertical power of movable part being drawn to the direction that opens circuit with the expression drive unit, the top is for just.The characteristic 61C that chain-dotted line is represented represents the drive unit of Figure 26 device draws power from movable part to the direction that opens circuit, in order to compare, also expresses the characteristic 55C (solid line) of Figure 21 device.Characteristic 61C is at minimum time T _MINAfter, the pressure rising along with expanding chamber 30 pulls to movable part the occasion of the power of the direction that opens circuit greater than characteristic 55C.Therefore, the device of Figure 26 can use the drive unit littler than Figure 21.

Figure 27 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, state when wherein (A) expression circuit breaker has just left, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.In Figure 27 (A), on fixed piston 11, form the air vent hole 67 that penetrates into expanding chamber 30 from surge chamber 8A, be subjected to reinforcing and the breather valve 68 that will all the time this air vent hole 67 be stopped up be located at the peristome by expanding chamber 30 1 sides of this air vent hole 67.The vent rod 69 that passes air vent hole 67 is housed on the breather valve 68, and the external diameter of this vent rod 69 changes at axial road, its left side, promptly by the external diameter of the part 69A of surge chamber 8A one side than the right side, promptly the part 69B by expanding chamber 30 1 sides is thin.Left end at vent rod 69 is fixed with spring base 72, clamps compressibility spring 65 between spring base 72 and fixed piston 11.In addition, the internal face of surge chamber 8A protrude be provided with can with the abutting part 80 of spring base 72 butts.Other structures of Figure 27 (A) are identical with Figure 26 (A).

Figure 27 (B) expression movable part moves right and circuit breaker has just passed through minimum arc duration T _MINThe time state, spring base 72 and abutting part 80 butts, breather valve 68 are pushed to the direction that breaks away from piston 11, thereby air vent hole 67 is opened.Compressed Gas in the surge chamber 8A is by air vent hole 67 and as shown by arrow J like that to expanding chamber 30 outflows, and the pressure of expanding chamber 30 begins to rise.But,, suppressed to flow through the compressed gas flow of air vent hole 67 so it is little to flow through the gas communication sectional area of air vent hole 67 from the Compressed Gas of surge chamber 8A because the particle size part 69B of vent rod 69 also is in the air vent hole 67.Therefore,, do not cause the pressure of surge chamber 8A to reduce, guaranteed to have in the surge chamber 8A enough pressure to be used to eliminate and left the electric arc that the gap takes place though the pressure of expanding chamber 30 rises.

Figure 27 (C) expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A is further compressed, spring base 72 and abutting part 80 butts, make breather valve 68 more to right-hand, promptly move to the direction that breaks away from fixed piston 11, and shown in arrow K, Compressed Gas flows out to expanding chamber 30.In this occasion, because the particle size part 67B of vent rod 69 extracts from air vent hole 67, the small diameter part of vent rod 69 divides 69A to come in the air vent hole 67, increase so flow through the gas communication sectional area of air vent hole 67 from the Compressed Gas in the surge chamber 8A, the compressed gas flow that flows through air vent hole 67 increases.

The characteristic of Figure 27 device is identical with the device of Figure 26.That is, the pressure of expanding chamber 30 is from the minimum arc duration T of circuit breaker _MINRise to rise, so it is little to impose on the counter-force of drive unit, its movable part is shown in the characteristic 61S among Figure 36, and specific characteristic 55S is in-position Y earlier.

Figure 28 is major part one sectional view of the buffer type gas circuit breaker internal structure of expression yet another embodiment of the invention, state when wherein (A) expression circuit breaker has just left, (B) the expression movable part from the state of (A) to right-hand mobile state, (C) the expression movable part from the state of (B) again to right-hand mobile state.In Figure 28 (A), on fixed piston 11, form the 1st air vent hole 75A and the 2nd air vent hole 75B that penetrates into expanding chamber 30 from surge chamber 8A.In the 1st air vent hole 75A and the 2nd air vent hole 75B, pass the 1st vent rod 74A and the 2nd vent rod 74B respectively.In the right part of the 1st vent rod 74A and the 2nd vent rod 74B, promptly by the end of expanding chamber 30 1 sides, the 1st breather valve 76A and the 2nd breather valve 76B are housed respectively, left part at the 1st vent rod 74A and the 2nd vent rod 74B, be fixed with the 1st spring base 70A and the 2nd spring base 70B respectively, clamping compressibility the 1st spring 73A and compressibility the 2nd spring 73B respectively between the 1st spring base 70A and the fixed piston 11 and between the 2nd spring base 70B and the fixed piston 11.。In addition, protrude at the internal face of surge chamber 8A that be provided with can be respectively and the 1st abutting part 71A and the 2nd abutting part 70B of the left part of the 1st vent rod 74A and the 2nd vent rod 74B.Other structures of Figure 28 (A) are identical with Figure 26 (A).

Figure 28 (B) expression movable part moves right and circuit breaker has just passed through minimum arc duration T _MINThe time state, the 1st spring base 70A and the 1st abutting part 71A butt, the 1st breather valve 76A are pushed to the direction that breaks away from piston 11, thereby the 1st air vent hole 75A is opened.Compressed Gas in the surge chamber 8A is flowed out to expanding chamber 30 like that by the 1st air vent hole 75A and shown in arrow L, and the pressure of expanding chamber 30 begins to rise.At this moment, as long as select the voltage supply of the 1st air vent hole 75A to contract in advance gas communication sectional area that gas stream crosses makes compressed gas flow minimum,, do not cause the pressure of surge chamber 8A to reduce though then the pressure of expanding chamber 30 rises.Thereby guaranteed to have in the surge chamber 8A enough pressure to be used to eliminate and left the electric arc that the gap takes place.

Figure 28 (C) expression circuit breaker has just passed through maximum arc duration T _MAXThe time state.Surge chamber 8A is further compressed, and the 2nd spring base 70B and the 2nd abutting part 71B butt, the 2nd breather valve 76B are pushed to the direction that breaks away from piston 11, thereby the 2nd air vent hole 75B is opened.Make pressure in the surge chamber 8A respectively shown in arrow M, N, flow out by the 1st air vent hole 75A and the 2nd air vent hole 75B twocouese expanding chamber 30, the pressure of expanding chamber 30 begins to rise.Owing to flow out by 2 air vent holes from the Compressed Gas in the surge chamber 8A, so flowing through the gas communication sectional area of air vent hole, Compressed Gas increases, the compressed gas flow that flows into expanding chamber 30 1 sides increases.

The characteristic of Figure 28 device also device with Figure 26 is identical.That is, the pressure of expanding chamber 30 is from the minimum arc duration T of circuit breaker _MINRise to rise, so it is little to impose on the counter-force of drive unit, its movable part is shown in the characteristic 61S among Figure 36, and specific characteristic 55S is in-position Y earlier.

In addition, the gas communication control device that Figure 26 controls the gas communication sectional area of opening in Figure 28 is not necessarily leaveed no choice but be made of to flowing valve shown in Figure 28, circulation bar and abutting part etc. Figure 26, so long as make insulating gas begin to flow to expanding chamber, the structure that flows to the flow of the insulating gas of expanding chamber and further increase from surge chamber is got final product through opening from surge chamber behind the minimum arc duration when opening circuit.

In addition, in the embodiment of Figure 28, abutting part 80,71A, 71B are lug boss at Figure 25, but as shown in Figure 3, abutting part is not a convex shape yet.In addition, in the embodiment of Figure 28, also Figure 13 and unidirectional valve shown in Figure 23 can be set at Figure 25 on partition wall 30., in the embodiment of Figure 28, and leave the steam vent 7B that the gap is communicated with and also can not be communicated with at Figure 25 with expanding chamber 30.

As previously mentioned, the present invention penetrates into and the fixing air vent hole of the opposite side of striking auxiliary contact by forming on fixed piston from surge chamber, before the maximum arc duration when opening circuit aforementioned air vent hole is stopped up, simultaneously aforementioned air vent hole is opened, can use the drive unit littler, can dwindle circuit breaker and reduce cost than conventional apparatus.

In addition, be arranged side by side by the open bore and the aforementioned air vent hole that will connect fixed piston in said structure, aforementioned breather valve is opened aforementioned air vent hole and aforementioned open bore simultaneously, can dwindle the external diameter of circuit breaker, can dwindle circuit breaker more and reduces cost.

In addition, by on air exhaust rod, forming and leaving the steam vent that the gap is communicated with, but partition wall fixing in the periphery of air exhaust rod and the fixed piston sliding contact, form expanding chamber with partition wall, air exhaust rod and fixed piston simultaneously, and be communicated with steam vent near making the minimum arc duration of this expanding chamber when opening circuit, can use the drive unit littler, can dwindle circuit breaker and reduce cost than the past.

In addition, by the periphery setting of air exhaust rod can with the partition wall of fixed piston sliding contact, use partition wall simultaneously, air exhaust rod and fixed piston form expanding chamber, and on fixed piston, form the decompression hole that penetrates into expanding chamber from surge chamber, and the gas communication control device is set, surge chamber to pressure surpass at least aforementioned and decompression hole opened when leaving the required minimum pressure of gap extinguishing arc, force to keep the decompression hole open mode behind the maximum arc duration when opening circuit simultaneously, can use the drive unit littler, can further dwindle circuit breaker and reduce cost than the past.

In addition, by the periphery setting of air exhaust rod can with the partition wall of fixed piston sliding contact, use partition wall simultaneously, air exhaust rod and fixed piston form expanding chamber, and on fixed piston, form the air vent hole that penetrates into expanding chamber from surge chamber, and the gas communication control device is set, making insulating gas begin to flow to through air vent hole from surge chamber behind the minimum arc duration when opening circuit expands, the flow that flows to the insulating gas of expanding chamber from surge chamber is further increased, can use the drive unit littler, can further dwindle circuit breaker and reduce cost than the past.

In addition, by on the partition wall in said structure unidirectional valve being set, and this unidirectional valve just makes the insulation air flow to expanding chamber from free space when only the air pressure in expanding chamber is lower than the air pressure of free space in the airtight container, can use littler drive unit, can dwindle circuit breaker and reduces cost.

Claims (12)

1. buffer type gas circuit breaker, it is the striking auxiliary contact fixedly, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact with the fixing air exhaust rod of the opposite side of striking auxiliary contact, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds described surge chamber is packed airtight container into insulating gas in, make by described movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of described airtight container, in case clearance order is arranged to be sent, drive unit just make described movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the described electric arc that takes place in the gap that leaves, it is characterized in that, on described fixed piston, form from surge chamber one side and penetrate into air vent hole with the side that fixedly the striking auxiliary contact are opposite, and before being provided with maximum arc duration when opening circuit described air vent hole is stopped up, the gas communication control device of after maximum arc duration, described air vent hole being opened.

2. buffer type gas circuit breaker according to claim 1, it is characterized in that, described gas communication control device by the peristome of an opposite side that is located at described air vent hole with surge chamber and be subjected to reinforcing and stop up the breather valve of described air vent hole all the time and be located at described breather valve by behind surge chamber one side and the maximum arc duration when opening circuit the pushing member of described breather valve to the direction pushing that breaks away from described fixed piston being constituted.

3. buffer type gas circuit breaker according to claim 2 is characterized in that, the open bore and the described air vent hole that connect described fixed piston are arranged side by side, and described breather valve is opened described air vent hole and described open bore simultaneously.

4. according to each described buffer type gas circuit breaker of claim 1 to 3, it is characterized in that, the periphery of described air exhaust rod fixing can with the partition wall of described fixed piston sliding contact, and with this partition wall and described air exhaust rod and described fixed piston formation expanding chamber.

5. buffer type gas circuit breaker, it is the striking auxiliary contact fixedly, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact and the air exhaust rod side that fixedly the striking auxiliary contact are opposite, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds described surge chamber is packed airtight container into insulating gas in, make by described movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of described airtight container, in case clearance order is arranged to be sent, drive unit just make described movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the described electric arc that takes place in the gap that leaves, it is characterized in that, on described air exhaust rod, form with described and leave the steam vent that the gap is communicated with, and the periphery setting of air exhaust rod can with the partition wall of described fixed piston sliding contact, form expanding chamber with this partition wall and described air exhaust rod and described fixed piston simultaneously, be communicated with described steam vent near making the minimum arc duration of this expanding chamber when opening circuit.

6. buffer type gas circuit breaker, it is the striking auxiliary contact fixedly, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact and the air exhaust rod side that fixedly the striking auxiliary contact are opposite, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds described surge chamber is packed airtight container into insulating gas in, make by described movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of described airtight container, in case clearance order is arranged to be sent, drive unit just make described movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the described electric arc that takes place in the gap that leaves, it is characterized in that, the periphery setting of described air exhaust rod can with the partition wall of described fixed piston sliding contact, simultaneously with described partition wall and described air exhaust rod and described fixed piston formation expanding chamber, on described fixed piston, form and penetrate into the decompression hole of expanding chamber, and be provided with pressure at described surge chamber and surpass at least described and described decompression hole is opened when leaving the required minimum pressure of gap extinguishing arc from surge chamber, keep the gas communication control device of described decompression hole open mode after the maximum arc duration when opening circuit forcibly.

7. buffer type gas circuit breaker according to claim 6, it is characterized in that, described gas communication control device by be located at described decompression hole by the peristome of expanding chamber one side and be subjected to the dropping valve that described decompression hole is stopped up to the reinforcing of surge chamber direction all the time and be located in the described surge chamber and maximum arc duration when opening circuit after the pushing member of described dropping valve to the direction pushing that breaks away from described fixed piston constituted.

8. buffer type gas circuit breaker, it is the striking auxiliary contact fixedly, with this fixedly the striking auxiliary contact connect from movable striking auxiliary contact, be fixed on these movable striking auxiliary contact and the air exhaust rod side that fixedly the striking auxiliary contact are opposite, the fixed piston that the periphery of this air exhaust rod forms the bounce cylinder of surge chamber and embeds described surge chamber is packed airtight container into insulating gas in, make by described movable striking auxiliary contact, the drive unit that the movable part that air exhaust rod and bounce cylinder constitute moves is located at the outside of described airtight container, in case clearance order is arranged to be sent, drive unit just make described movable part to the fixing opposite side shifting of striking auxiliary contact, since the insulating gas in this mobile and compressed surge chamber to fixing striking auxiliary contact and movably the gap of leaving between the striking auxiliary contact blow out, to eliminate at the described electric arc that takes place in the gap that leaves, it is characterized in that, the periphery setting of described air exhaust rod can with the partition wall of described fixed piston sliding contact, simultaneously with described partition wall and described air exhaust rod and described fixed piston formation expanding chamber, on described fixed piston, form the air vent hole that penetrates into expanding chamber from surge chamber, and make insulating gas begin to flow to expanding chamber by described air vent hole after minimum arc duration when opening circuit is set from surge chamber, behind maximum arc duration, make the further gas communication control device that increases of insulating gas flow that flows to expanding chamber from surge chamber.

9. buffer type gas circuit breaker according to claim 8, it is characterized in that, described gas communication control device by pass described air vent hole and its by the external diameter of surge chamber one side less than by the vent rod of the external diameter of expanding chamber one side, be installed in this vent rod by the breather valve of expanding chamber one side end and be located in the described surge chamber and minimum arc duration when opening circuit after described vent rod is constituted to the pushing member that described breather valve breaks away from the direction pushing of fixed piston.

10. buffer type gas circuit breaker according to claim 8, it is characterized in that, described air vent hole is made of the 1st air vent hole and the 2nd air vent hole, to the 1st gas communication control device controlled through the circulation of the insulating gas of the 1st air vent hole by the 1st breather valve that is located at described the 1st air vent hole by expanding chamber one side opening portion, and be located in the described surge chamber and the minimum arc duration when opening circuit after the 1st pushing portion of described the 1st breather valve to the direction pushing that breaks away from fixed piston constituted, to the 2nd gas communication control device controlled through the circulation of the insulating gas of the 2nd air vent hole by the 2nd breather valve that is located at described the 2nd air vent hole by expanding chamber one side opening portion, and be located in the described surge chamber and the maximum arc duration when opening circuit after the 2nd pushing portion of described the 2nd breather valve to the direction pushing that breaks away from fixed piston constituted.

11. each described buffer type gas circuit breaker in 10 according to Claim 8, it is characterized in that, on described air exhaust rod, form and leave the steam vent that the gap is communicated with, and be communicated with described expanding chamber near making the minimum arc duration of this steam vent when opening circuit with described.

12. according to claim 5 or 11 described buffer type gas circuit breakers, it is characterized in that, on described partition wall unidirectional valve is set, this unidirectional valve just makes insulating gas flow to expanding chamber from free space when only the air pressure in expanding chamber is lower than in the airtight container free space air pressure.

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