CN2221826Y

CN2221826Y - Gate-switching off air buffer of vacuum circuit breaker

Info

Publication number: CN2221826Y
Application number: CN 94242868
Authority: CN
Inventors: 朱小峰; 常青
Original assignee: DONGNAN POWER EQUIPMENT PLANT CHANGZHOU CITY
Current assignee: DONGNAN POWER EQUIPMENT PLANT CHANGZHOU CITY
Priority date: 1994-11-07
Filing date: 1994-11-07
Publication date: 1996-03-06
Anticipated expiration: 2004-11-07

Abstract

The utility model relates to a gate-switching off air buffer of a vacuum circuit breaker which belongs to the important component of the vacuum circuit breaker of high voltage electrical apparatuses, and the utility model is composed of a division switch spring, a cylinder (an air buffer) and a division switch limiting device. The switch of the gate-switching off air buffer of the vacuum circuit breaker is closed to drive the piston screw rod of the cylinder to move, the air passage of the piston is opened to cause the cylinder to suck air, and meanwhile, the division switch spring is compressed; when the switch of the gate-switching off air buffer of the vacuum circuit breaker is divided, the division switch spring releases energy to cause the piston rod to make rapid and repeated motion, and compressed air which is formed in the cylinder generates resistance which is gradually increased to the piston screw rod and to control the air volume of an air hole after the air passage of the piston is closed, which realizes the smooth decelerated motion of the piston screw rod and reaches no over stroke and opposite bounce.

Description

Vacuum circuit-breaker separating brake air buffer

The utility model relates to a kind of vacuum circuit-breaker separating brake air buffer, belongs to the important composition parts of vacuum circuit-breaker in the High-Voltage Electrical Appliances.

Be the mechanical endurance of the vacuum extinction chamber bellows that guarantees vacuum circuit-breaker, require the mistake stroke of its separating brake as far as possible little, the bounce-back of its stopping means is jumped also should be enough little, wear because this bounce-back jumping can cause the bang in gap, the secondary that electric arc occurs is restriked, the scaling loss contact, thereby reduce its useful life, therefore, the general operating mechanism of vacuum circuit-breaker all is equipped with the splitting lock cushioning device, jumps with the bounce-back that suppressed stroke.

Vacuum circuit-breaker mostly adopts known oil bumper or rubber buffering, and this structure makes opening characteristic present sudden change trend, eliminates the DeGrain of contact bounce.

The purpose of this utility model is to avoid the problems referred to above of prior art, and provides a kind of bounce-back jumping, opening characteristic of fundamentally eliminating stroke to be the smoothing buffer characteristic, cut-offs the vacuum circuit-breaker separating brake air buffer of best results.

The purpose of this utility model reaches by following technical proposal.

The utility model includes by cylinder block, has the hat upper cylinder cover of mesopore and pore, following cylinder cap and be connected sealing cylinder barrel, a top that the screw rod of upper and lower cylinder cap forms and piston screw and that movable joint, lower end pass hat upper cylinder cover mesopore, cylinder barrel and following cylinder cap is housed is enclosed within tripping spring on the hat upper cylinder cover, on the piston screw in cylinder barrel piston is housed, tripping spring is fixed on the piston screw by nut and spring base.The movable joint on piston screw top forms slide block mechanism as linking to each other with vacuum circuit-breaker main shaft connecting lever.Cylinder barrel is fixed on the side plate of operating mechanism with bearing pin.The piston of piston screw lower end is provided with pore and side channel, and tension spring and piston ring are housed in its side channel.Be provided with sealing gland and backing plate between hat upper cylinder cover and the piston in the cylinder barrel.The median pore diameter that one section the diameter of piston screw in the hat upper cylinder cover is slightly less than the hat upper cylinder cover forms the gap.Be provided with gas circuit between the gap in hat upper cylinder cover lower end and its mesopore.On the piston screw of cylinder barrel lower end, be provided with the separating brake stopping means of forming by disk spring group and piston screw nut.

When the vacuum breaker closing, the compression tripping spring drives piston screw simultaneously and moves downward the gas circuit of opening the piston top and make the sealing cylinder barrel air-breathing; When the vacuum breaker open operation, release energy by tripping spring and to make piston screw reply immediately swivel motion soon, rely on the compressed air closure piston top gas circuit that forms in the cylinder barrel simultaneously, by the pore air-out on the hat upper cylinder cover, make piston screw do the smooth deceleration motion, reach the purpose of buffering and elimination contact bounce.

The advantage that the utility model compared with prior art has is: adopt the separating brake air cushioning, make opening characteristic level and smooth, having eliminated the cross stroke bounce-back of vacuum arc-extinguishing chamber contact when separating brake jumps, the bang that has taken place when having avoided vacuum circuit-breaker to cut-off short circuit current is worn, reached best cut-offfing effect, the useful life of having improved vacuum circuit-breaker.

The explanation of accompanying drawing drawing:

Fig. 1 is a structural representation of the present utility model.

The utility model shown in Figure 1 includes by cylinder block 103, has the hat upper cylinder cover 104 of mesopore 1041 and pore 1042, following cylinder cap 101 and be connected sealing cylinder barrel 10, a top that the spiral shell thick stick 102 of upper and lower cylinder cap (104 and 101) forms and mesopore 1041 that movable joint 1, lower end pass upper cylinder cover 104 is housed places the piston screw 2 and that piston 6 is housed in the cylinder barrel 10 to be enclosed within tripping spring 5 on the hat upper cylinder cover 104, and tripping spring 5 is fixed on the piston screw 2 by nut 3 and spring base 4.Piston 6 is provided with pore 61 and side channel 62, and tension spring 8 and piston ring 9 are housed in its side channel 62.In cylinder barrel 10, be provided with sealing gland 7 between hat upper cylinder cover 104 and the piston 6.The diameter that the diameter of the one section 2-1 of piston screw 2 in hat upper cylinder cover 104 is slightly less than hat upper cylinder cover 104 mesopores 1041 forms gap 2-2, is provided with gas circuit line 106 between the gap 2-2 in hat upper cylinder cover 104 lower ends and its mesopore 1041.Be provided with the separating brake stopping means of forming by disk spring group 14 and nut 12 11 in cylinder barrel 10 lower ends.

Best position of the present utility model is that cylinder barrel 10 usefulness bearing pins 107 are fixed on the side plate of operating mechanism, and the movable joint 1 of piston screw 2 links to each other with the main shaft connecting lever and forms slide block mechanism.

During use, when vacuum circuit-breaker closes a floodgate, the piston screw 2 that drives sealing cylinder barrel 10 moves downward, open the pore 1042 on the piston 6, make cylinder barrel 104 air-breathing, when the vacuum breaker open operation, release energy by tripping spring 5, make piston screw 2 reply immediately swivel motion soon, rely on compressed air to close gas circuit 106 simultaneously, the compressed air that forms in the cylinder barrel produces the resistance that increases gradually to the motion of piston screw 2, when motion nearly finishes, by the air displacement of the pore 1042 on the control hat upper cylinder cover 104, realize the smooth deceleration motion of piston screw at last, reach the bounce-back jumping that vacuum circuit-breaker did not have stroke.

Claims

1, a kind of vacuum circuit-breaker separating brake air buffer, it is characterized in that: include by cylinder block [103], the hat upper cylinder cover [104] that has mesopore [1041] and pore [1042], in following cylinder cap [101] and the connection, the sealing cylinder barrel [10] that the screw rod [102] of following cylinder cap [104 and 101] is formed, movable joint [1] is equipped with on one top, the mesopore [1041] of hat upper cylinder cover [104] is passed in the lower end, the piston screw [2] and one of cylinder barrel [10] and following cylinder cap [101] is enclosed within the tripping spring [5] on the hat upper cylinder cover [104], on the piston screw [2] in cylinder barrel [10] piston [6] is housed, tripping spring [5] is fixed on the piston screw [2] by nut [3] and spring base [4], piston [6] is provided with pore [61] and side channel [62], tension spring [8] and piston ring [9] are housed in its side channel [62], in cylinder barrel [10], be provided with sealing gland [7] and backing plate [7-1] between hat upper cylinder cover [104] and the piston [6], mesopore [1041] diameter that the diameter of one section [2-1] of piston screw [2] in hat upper cylinder cover [104] is slightly less than hat upper cylinder cover [104] forms gap [2-2], be provided with gas circuit [106] between the gap [2-2] in hat upper cylinder cover [104] lower end and its mesopore [1041], the separating brake stopping means of being made up of disk spring group [14] and nut [12] [11] is housed on the piston screw [2] of cylinder barrel [10] lower end.