CN202585149U - Improved moving contact of circuit breaker - Google Patents

Abstract

The utility model provides an improved moving contact of a circuit breaker and belongs to the technical field of circuit breakers. The improved moving contact of the circuit breaker comprises a rotating shaft, contact sets, springs and a support plate. One or more contact sets forms one or more poles of a circuit breaker, and the support plate is fixed on the rotating shaft and corresponds to each pole of the circuit breaker. The number of the springs is the same with that of independent contacts in the contact sets, and one ends of the springs are connected with the support plate and the other end of the springs are connected with the independent contacts of the contact sets. The improved moving contact of the circuit breaker has the advantages that holes corresponding to positions of the independent contacts are arranged on the support plate and the number of the holes is the same with that of the independent contacts. Each hole is arranged on the support plate in the way that distances between holes arranged in the middle position and the contact sets is larger than that between holes arranged on two sides and the contact sets. Moreover, the far the hole is from the middle position, the closer the distance is to the contact sets. The improved moving contact of the circuit breaker has the advantages of achieving increase of endurance capacitor of large current of the entire set of the contacts in short time with small cost, and facilitating protection of short short-time delay of the short circuit of B-type circuit breakers.

Description

A kind of improved circuit breaker movable contact

Technical field

The utility model belongs to the circuit-breaker technical field, is specifically related to a kind of improved circuit breaker movable contact

Background technology

have big capacity circuit-breaker now, and for bearing great current more effectively, the contact of its each utmost point is formed by independent contact arrangement more than 3 or 3 usually, is referred to as one group of contact.When closing a floodgate; In order to make moving contact under the effect of mechanism's switching force, can closely contact and produce " excess of stroke " with fixed contact; Moving contact is installed on the insulating element (generally being referred to as rotating shaft) by elements such as spring, axles usually rotationally, accepts the action from mechanism by insulating element.Usually each independent contact is by identical spring indistinction ground flexible fastening, and each contact has identical contact pressure when closing a floodgate with assurance.Yet when bearing great current, the electrodynamic repulsion force size that each contact receives is distinguishing.Cut down Er Dinglv according to Biot-Sha; Each moving contact receives from the size of making a concerted effort of the electrodynamic repulsion force of each fixed contact relevant with the position of direction and moving contact; The component vertically upward that the contact in centre position receives is for maximum, and the component vertically upward that the contact of two side positions receives is for minimum.L-G simulation test shows; During one group of sets of contacts energising with 10 independent contacts; Be positioned at electrodynamic repulsion force that electrodynamic repulsion force that the contact in centre position receives receives than the contact that is positioned at outer fix exceed about 30%, and from middle position to two side positions, electrodynamic repulsion force distributes to appear and reduces trend successively.Existing circuit breaker, owing to do not take into full account one group of disequilibrium that contact is stressed in the design, when meeting with big short circuit current, the contact in centre position can produce bigger electrodynamic repulsion force, the contact of comparing two side positions more early or quickly produces " scolding out " phenomenon.This drawback has weakened the short circuit short circuit withstand capacity of whole group of contact, (under short-circuit conditions, has one and is used for optionally artificial Duan Yanshi &lt for the category-B circuit breaker; Ke Tiaojie> ) the lifting of short circuit short time delay protective value totally unfavorable.

In view of above-mentioned existing problems, be necessary the structure of existing circuit breaker movable contact is improved, for this reason, the applicant has done useful design, and the technical scheme that will introduce below produces under this background

Summary of the invention

The task of the utility model is that a kind of improved circuit breaker movable contact will be provided; (as if contact quantity is even number through strengthening the contact that is positioned at the centre position in one group of contact for it; During then the centre position contact is made a comment or criticism two) spring force is eliminated or is alleviated the deficiency that exists in the prior art; Realize increasing the whole short circuit short circuit withstand capacity of organizing contact with less cost price, be particularly conducive to the short circuit short time delay protection of category-B circuit breaker.

The task of the utility model is accomplished like this; A kind of improved circuit breaker movable contact; Comprise the rotating shaft that insulating material is processed, the sets of contacts that is used for loaded current, spring and supporting bracket that the independent contact more than three or three combines side by side, described sets of contacts has one or more; One or more sets of contacts constitute one or more utmost points of circuit breaker; Be installed in the described rotating shaft, the quantity of described supporting bracket is identical with the number of poles of circuit breaker, is separately fixed in the rotating shaft and corresponding to each utmost point of circuit breaker; The quantity of described spring is identical with the quantity of each independent contact in the sets of contacts; One end of each spring is connected with supporting bracket, the other end of each spring is connected with independent contact in the sets of contacts, through spring sets of contacts is applied pulling force to the combined floodgate direction, is characterized in: on the described supporting bracket spaced apart be provided with described sets of contacts on the identical and corresponding hole that is used to connect spring one end, position of quantity of each independent contact; The arrangement of each hole on supporting bracket appear the centre position the hole (if contact quantity is even number, during then make a comment or criticism in the hole in centre position two; If contact quantity is odd number, during then make a comment or criticism in the hole in centre position one) with the distance of sets of contacts greater than the hole of two side positions and the distance of sets of contacts, and Kong Yue is then near more with the distance of sets of contacts away from the centre position of supporting bracket.

In one of the utility model concrete embodiment, the arrangement of each hole on supporting bracket presents law curve and arranges .

in another concrete embodiment of the utility model, described law curve arrange be meant that parabola is arranged, elliptic curve is arranged or linear array in a kind of.

the utility model is because after adopting said structure; The beneficial effect that has: the spring tension that changes each independent contact in the sets of contacts through the positional alignment in the hole on supporting bracket, offered; Make the spring tension of the spring tension of the independent contact that is positioned at the centre position in the sets of contacts greater than the independent contact of two side positions; And it is far away more apart from the centre position; Then spring tension is more little, thereby realizes increasing the whole big electric current short circuit withstand capacity of organizing contact with less cost price, is particularly conducive to the short circuit short time delay protection of category-B circuit breaker.

Description of drawings

Fig. 1 is an embodiment end view of the utility model.

Fig. 2 is the opposite side end view of an embodiment of the utility model.

Fig. 3 is the structural representation that the only independent contact of list in the said sets of contacts of the utility model is connected with supporting bracket through spring.

Fig. 4 is that the described sets of contacts of the utility model is through one group of planar structure sketch map that spring is connected with supporting bracket.

Fig. 5 is a kind of form of the arrangement regulation in each hole on the described supporting bracket of the utility model.

Fig. 6 is the another kind of form of the arrangement regulation in each hole on the described supporting bracket of the utility model.

Fig. 7 is another form of the arrangement regulation in each hole on the described supporting bracket of the utility model.

Embodiment

can be expressly understood the technical spirit and the beneficial effect of the utility model more for the auditor that the makes Patent Office especially public; The applicant general elaborates with the mode of embodiment below; But the description to embodiment all is not the restriction to the utility model technical scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be regarded as the technical scheme category of the utility model.

see also Fig. 1, Fig. 2, Fig. 3 and Fig. 4; A kind of improved circuit breaker movable contact of the utility model; Its overall structure comprises but is not limited only to like Fig. 1, the form shown in 2, is the movable contact of one or four polar forms, has only illustrated the structure of a utmost point among the figure briefly.Rotating shaft 1 is installed in the breaker body for holding and the fixing parts processed of the insulating material of remaining part, accepts from the action of mechanism's (not shown) and pass to contact to realize breaking off or closed procedure.Sets of contacts 2 is for closely to be arranged in the conductive component that is used for loaded current and breaking current together by the independent contact that (shown in the figure is five) more than three or three side by side; All the other electric conductors that comprise not shown circuit breaker, a utmost point of formation circuit breaker.

see also Fig. 3 and combine Fig. 4, and sets of contacts 2 is made up of five identical independent contacts of planform, and the difference according to the position is divided into 2a, 2b and 2c respectively, and every independent contact all has protuberance 21 and hole 22.Described sets of contacts 2 is installed in the described rotating shaft 1 after hole 22 (not shown)s of passing on all independent contacts through bearing pin rotationally.One end of described spring 3 is connected protuberance 21 positions of independent contact; The other end of described spring 3 is fixed in the hole 41 of supporting bracket 4; Thereby each independent contact is applied pulling force to the combined floodgate direction; Enough contact pressure when offering contact and closing a floodgate, and stop contact before the electric current that passes through reaches certain numerical value, to produce " scolding out " phenomenon.Supporting bracket 4 is fixed in the rotating shaft 1, guarantees that by the pulling force of spring 3 corresponding binding face with rotating shaft 1 fits tightly and do not come off, also can with rotating shaft 1 integral production.

please continue referring to Fig. 3, Fig. 4; On the supporting bracket 4 spaced apart be provided with described sets of contacts 2 on totally five in the corresponding hole 41 that is used to be connected spring 3 one ends, the identical and position of the quantity of each independent contact 2a, 2b and 2c, the difference according to the position is divided into 41a, 41b, 41c respectively.Hole on the supporting bracket 4 41 is made as L to the distance of protuberance 21, and then the hole 41a of diverse location on the supporting bracket 4,41b, 41c are respectively La, Lb, Lc (L that illustrates among Fig. 3 is respectively La, Lb, Lc) to the distance corresponding to the last protuberance 21 of independent contact 2a, 2b, 2c.Obviously, each distance satisfies La ﹥ Lb ﹥ Lc in Fig. 4.

supporting bracket 4 satisfies and concerns La ﹥ Lb ﹥ Lc, i.e. the arrangement in each hole correspondingly is arranged to the form like curve among Fig. 5, Fig. 6 and Fig. 7.Wherein Fig. 5 is that parabola, Fig. 6 are that elliptic curve, Fig. 7 are straight line, and certainly, the alignment curve form in each hole does not receive any restriction, and it can also be other more reasonably curve.Like this, the spring deflection at the independent contact 2a place that mediates is maximum, thereby the spring tension that receives is maximum, and more away from the contact in centre position, the spring tension that receives is more little.To outer fix, the spring counter-force presents gradual change layout from big to small to whole group contact by the centre position.So; Under big electric current; Or claim to reach contact scold out current value the time; The independent contact that is positioned at the centre position is at the electrodynamic repulsion force that relatively more the effect of big spring counter-force can be offset down or partial offset is bigger than other position contacts, and every contact is scolded current value battle what suitable spring force coupling can reach unanimity or approaching unanimity down.

In sum, the technical scheme that the utility model provides has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of applicant

Claims (3)

1. a kind of improved circuit breaker movable contact; Comprise the rotating shaft (1) that insulating material processes, the sets of contacts that is used for loaded current (2), spring (3) and the supporting bracket (4) that the independent contact more than three or three combines side by side; Described sets of contacts (2) has one or more; One or more sets of contacts (2) constitute one or more utmost points of circuit breaker; Be installed in the described rotating shaft (1); The quantity of described supporting bracket (4) is identical with the number of poles of circuit breaker, is separately fixed at that rotating shaft (1) is gone up and corresponding to each utmost point of circuit breaker, and respectively independently the quantity of contact is identical in the quantity of described spring (3) and the sets of contacts (2); One end of each spring (3) is connected with supporting bracket (4), the other end of each spring (3) is connected with independently contact in the sets of contacts (2); Through spring (3) sets of contacts (2) is applied pulling force to the combined floodgate direction, it is characterized in that: described supporting bracket (4) goes up the spaced apart identical and corresponding hole (41) that is used to connect spring (3) one ends, position of quantity of going up each independent contact with described sets of contacts (2) that is provided with, and each hole (41) arrangement on supporting bracket (4) presents the distance of hole and sets of contacts (2) in centre position greater than the hole of two side positions and the distance of sets of contacts (2); And hole (41) are then near more with the distance of sets of contacts (2) more away from the centre position of supporting bracket (4).

2. a kind of improved circuit breaker movable contact according to claim 1 is characterized in that the arrangement of each hole (41) on supporting bracket (4) presents law curve and arrange.

3. A kind of improved circuit breaker movable contact according to claim 2, it is characterized in that described law curve arrange be meant that parabola is arranged, elliptic curve is arranged or linear array in a kind of

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