CN2409604Y - Timing and back spring structure for circuit breaker - Google Patents

Abstract

A locating and rebound structure for a circuit breaker is additionally arranged on the left end of a spindle of a circuit breaker. The utility model comprises a couple of side boards, a couple of bearings, an extension spring fixed axis, a connecting rod pin board, a rotating shaft, a couple of extension springs, a connecting rod and a couple of axle beds, wherein, the side boards are installed on the base. The bearings are sleeved on the spindle and positioned in the bearing grooves of the side boards. The extension spring fixed axis is fixed between the side boards. The connecting rod pin board is fixed on the spindle. The rotating shaft is installed on the connecting rod pin board. One end of the extension springs is installed on the extension spring fixed axis and the other end is installed on the rotating shaft. One end of the connecting rod is connected with the connecting rod pin board and the other end is fixed on the movable contact of the circuit breaker. The axle beds are installed on the spindle and fixed to the base. The utility model has the advantages of compact structure, convenient installation, reliable position, etc. The spindle is not easy to bend, and the utility model can ensure the uniformity of the contact close overruns and can effectively prevent the contact bounce.

Description

Circuit breaker is jumped structure with location, bounce-back

The utility model relates to a kind of circuit breaker and jumps structure with locating, rebounding, and particularly is installed on the main shaft of the bigger frame-type circuit breaker of shell frame grade rated current, plays the location, prevents main shaft bending and contact of breaker bounce-back jumping.

Original frame-type circuit breaker, because employed rated current is less, thereby the size of its framework is also less, the length of corresponding main shaft is also shorter, so a cover location only need be set on main shaft, bounce-back jumping structure is just passable, but, along with the increase of current capacity (rated current 〉=4000A), the frame size of frame-type circuit breaker is also increasing, bring the length of circuit breaker main shaft also constantly to extend thus, the slenderness ratio L/D that makes main shaft is greater than more than 30 times, the main shaft of this big span excess of stroke only at one end is provided with a cover location, structure is jumped in bounce-back can bring a lot of defectives to circuit breaker: at first, circuit breaker is behind separating brake, and contact rebounds the limit accordingly because the L/D of axle is excessive, makes its spring aggravation more; Secondly, mechanism is not provided with the easy distortion of main shaft of location, bounce-back jumping structure one end and becomes curved behind combined floodgate, the poor synchronization that causes closing a floodgate, combined floodgate excess of stroke skewness, thus making the reduction of circuit breaker breaking capacity, short circuit withstand capacity also can be restricted; Simultaneously, because the contact bounce aggravation can cause arc reignition, circuit breaker instantaneous branch under Short-Circuit High Current is had no progeny, arc burning aggravates, and has greatly limited the performance index of circuit breaker.Therefore in order to overcome above-mentioned defective, must on the other end of circuit breaker main shaft, set up a cover location, bounce-back jumping structure.

The purpose of this utility model be to provide a kind of compact conformation, easy for installation, the location is reliable, main shaft is not flexible, can guarantee contact combined floodgate excess of stroke unanimity, prevent that effectively the circuit breaker of contact bounce from jumping structure with location, bounce-back.

The purpose of this utility model is achieved like this, and a kind of circuit breaker is jumped structure with location, bounce-back, sets up the left end at circuit breaker main shaft 10, and it comprises pair of side plates 21, is installed on the pedestal 8 of circuit breaker frame 1; Pair of bearings 5 is nested with on main shaft 10, and is installed in the bearing groove 2 of pair of side plates 21; One extension spring fixed axis 19 is fixed between the pair of side plates 21; One connecting rod fishplate bar 3 is fixed on the main shaft 10, and between pair of side plates 21; One rotating shaft 13 is installed on the connecting rod fishplate bar 3; A pair of extension spring 16, its two end is respectively equipped with extension spring seat 23,15, and extension spring seat 23 is installed on the extension spring fixed axis 19, and extension spring seat 15 is installed in the rotating shaft 13; One connecting rod, 14, one ends are connected with connecting rod fishplate bar 3, and the other end is fixed on the moving contact of circuit breaker; A pair of axle bed 7 is installed on the main shaft 10, the both sides of pair of side plates 21, and fixing with pedestal 8.

Below in conjunction with accompanying drawing the utility model is further described below.

Accompanying drawing is a structural representation of the present utility model.

Side plate 21 of the present utility model has a pair of, on each side plate 21, offer bearing groove 2, bearing 5 is installed in the bearing groove 2, and bearing 5 is nested with on main shaft 10, and screw 22 passes behind the bearing screw 9 on corresponding through hole on the bearing 5, the side plate 21 pair of bearings 5 is fixing.It is fixing with nut 11 that extension spring fixed axis 19 of the present utility model passes screw corresponding on the pair of side plates 21 6 backs, on extension spring fixed axis 19, offer extension spring groove 18, connecting rod fishplate bar 3 solid weldings of the present utility model are on main shaft 10, rotating shaft 13 is installed on connecting rod fishplate bar 3, two ends in rotating shaft 13 offer jump ring groove 12 respectively, one end of a pair of extension spring 16 is nested with in the extension spring seat groove 18 of extension spring fixed axis 19 by the extension spring seat 23 on it respectively, the other end of a pair of extension spring 16 is nested with in rotating shaft 13 by the extension spring seat 15 on it respectively, the left side of extension spring seat 15, right two ends are by back-up ring 4, jump ring 17 snaps in the jump ring groove 12 and is located.One end of connecting rod 14 of the present utility model is connected with connecting rod fishplate bar 3, the other end is connected with the moving contact of circuit breaker, and when main shaft 10 rotations, drivening rod fishplate bar 3 rotates, and then the action of drivening rod 14, moving contact, thereby finish the moving contact of circuit breaker and the combined floodgate and the separating brake of fixed contact.

The utility model on main shaft 10, the both sides of pair of side plates 21 are respectively arranged with axle bed 7, axle bed 7 is fixing with pedestal 8.7 pairs of main shafts 10 of axle bed play a part spacing.

The utility model is when breaker closing, do the clockwise direction rotation by mechanism's drive main shaft 10 that operation is covered in 20 right-hand members, thereby the connecting rod fishplate bar 3 that drives on it is done the clockwise direction rotation, and then make counter clockwise direction by the moving contact of connecting rod 14 drive circuit breakers and rotate, make switch on of moving contact on fixed contact, behind the combined floodgate, spring in the moving contact is compressed, at this moment will produce very big counter-force between moving contact and the fixed contact, this counter-force is by connecting rod 14, connecting rod fishplate bar 13 acts on main shaft, because main shaft 10 is provided with stopping means, thereby its flexibility also is restricted, and reverses also to be restricted, thereby makes contact combined floodgate excess of stroke unanimity, the electrodynamic repulsion force that Short-Circuit High Current is produced is overcome by the spring counter-force in the moving contact, can greatly improve the breaking capacity of circuit breaker, performance index such as short circuit withstand capacity.

The utility model is when breaker open operation, also be to drive the rotation counterclockwise of main shaft 10 dos by the mechanism that operation is covered in 20 right-hand members, the connecting rod fishplate bar 3 that drives on it is rotated counterclockwise, thereby the moving contact that makes connecting rod 14 drive circuit breaker turns clockwise, moving contact and fixed contact are separated, behind the separating brake, the positive stop of bump circuit breaker inside, make contact produce spring, at this moment owing between extension spring fixed axis 19 and connecting rod fishplate bar 3, be provided with extension spring 16, and the active force of extension spring 16 is opposite with the contact bounce direction, so limited the spring of contact, breaker open operation is opened apart from being effectively guaranteed, avoided arc reignition, make short-circuit limit electric current breaking capacity get a promotion (evidence can reach 120KA).

The utility model is owing to the left end at main shaft 10 has additional a cover location, structure is jumped in bounce-back, and this installs with original The cover of one on the 20 right-hand member inner main axis 10 location is covered in operation, bounce-back is jumped structure and is symmetrically distributed, and frame-type circuit breaker is existed Size is big, have more when main shaft is longer that the location is reliable, main shaft is not flexible, can guarantee the contact combined floodgate excess of stroke simultaneously Unanimously, effectively prevent the advantages such as contact bounce, and this device is more simple in structure than also having with original structure, installation The characteristics such as convenience.

Claims (1)

1, a kind of circuit breaker is jumped structure with location, bounce-back, sets up the left end in circuit breaker main shaft (10), it is characterized in that it comprises pair of side plates (21), is installed on the pedestal (8) of circuit breaker frame (1); Pair of bearings (5) is nested with on main shaft (10), and is installed in the bearing groove (2) of pair of side plates (21); One extension spring fixed axis (19) is fixed between the pair of side plates (21); One connecting rod fishplate bar (3) is fixed on the main shaft (10), and is positioned between the pair of side plates (21); One rotating shaft (13) is installed on the connecting rod fishplate bar (3); A pair of extension spring (16), its two end is respectively equipped with extension spring seat (23), (15), and extension spring seat (23) is installed on the extension spring fixed axis (19), and extension spring seat (15) is installed in the rotating shaft (13); One connecting rod (14), an end is connected with connecting rod fishplate bar (3), and the other end is fixed on the moving contact of circuit breaker; A pair of axle bed (7) is installed in that main shaft (10) is gone up, the both sides of pair of side plates (21), and fixing with pedestal (8).

Images