CN102420083A

CN102420083A - Constant-pressure and fall-preventing dual-breakpoint contact system

Info

Publication number: CN102420083A
Application number: CN2011102266449A
Authority: CN
Inventors: 赵汉新; 赵敏海
Original assignee: Wuxi Sahat Electrical Co Ltd
Current assignee: Wuxi Sahat Electrical Co Ltd
Priority date: 2011-08-09
Filing date: 2011-08-09
Publication date: 2012-04-18
Anticipated expiration: 2031-08-09
Also published as: CN102420083B

Abstract

The invention discloses a constant-pressure and fall-preventing dual-breakpoint contact system which is applied to a circuit breaker and comprises a movable contact, a movable contact rotating shaft, a movable contact mounting pin, cam surfaces and inclined sliding chutes, wherein the mounting pin is used for connecting the movable contact with the movable contact rotating shaft; the cam surfaces are respectively arranged at two sides of the center of the movable contact; the inclined sliding chutes are arranged on the upper edge and the lower edge of the movable contact rotating shaft; movable pins extending towards two sides of the sliding chutes are arranged in the sliding chutes; a pair of movable contact tension springs positioned at the outer side of the movable contact rotating shaft is arranged at two ends of each movable pin for drawing; fixed pins are respectively and symmetrically arranged at the outer side of the movable contact rotating shaft; and the fixed ends of the movable contact tension springs are connected onto the fixed pins. Compared with a traditional dual-breakpoint system, the constant-pressure and fall-preventing dual-breakpoint contact system can be used for preventing the contact from falling, improving the breaking capacity of the circuit breaker and realizing the constancy of the initial pressure and the final pressure of the contact and has high operation safety and reliability.

Description

The dropproof double-breakpoint contact system of a kind of constant pressure

Technical field

The present invention relates to a kind of breaker contact system, especially relate to the dropproof double-breakpoint contact system of a kind of constant pressure.

Background technology

Along with the continuous increase of net capacity and the needs of centralized power distribution; Electricity electrical equipment requires its breaking capacity increasingly high; So the circuit breaker of current-limiting type structure of contact terminal extensive use in breaker of plastic casing, particularly double-breakpoint structure, because arc energy is born by two contacts; Breaking capacity also further improves, and it has obtained development more widely in recent years; Yet the power of scolding out of its contact of current-limiting type double-breakpoint structure is the electric current that depends on through between this contact; Promptly when current value increases to certain value; Dynamic and static contact begins to scold out under the effect in that loop electric power and node are electrodynamic simultaneously; This moment, the resistance between contact increased and the cycle variation of alternating current can cause the current attenuation of before circuit breaker cut-offs, flowing through between contact to scold the situation of the power of holding between less than dynamic and static contact to electric power fast; At this moment; The contact of before being scolded out be along with electrodynamic minimizing will promptly cause so-called contact to fall phenomenon from scolding open position to make position direction motion, thereby contact falls and can cause the minimizing of arc voltage between contact and make arc reignition can not cut-off fault current.

As everyone knows; How double-breakpoint structure keeps double break contact when the disjunction short circuit current, to increase fast because of the resistance between contact and cycle of alternating current changes and causes the current attenuation of before circuit breaker cut-offs, flowing through between contact to scold between less than dynamic and static contact to electric power under the situation of the power of holding to scold the contact of holding can not fall; This is to guarantee that dual-interruption point breaker reaches one of key element of high breaking index more, just needs a kind of dropproof structure of contact terminal of design for this reason; At present, traditional contact of breaker pressure often with the directly proportional linear relationship of the excess of stroke of contact, the wearing and tearing of contact reduce the contact stroke that exceeds the quata thereupon; So; The corresponding minimizing of contact pressure, and then can make the temperature rise of circuit breaker exceed standard and cisco unity malfunction, so design is a kind of can prevent that contact falls the dropproof structure of contact terminal that can make the contact pressure of contact in excess of stroke scope keep definite value simultaneously again with regard to needing; To reach high breaking, long purpose of electric life-span of circuit breaker.

Summary of the invention

To above-mentioned technical problem; The object of the present invention is to provide the dropproof double-breakpoint contact system of a kind of constant pressure; This contact system can not only prevent that contact from falling, and can realize initial pressure and final pressure constant of contact, promptly guarantees the constant pressure of contact system.

The objective of the invention is to realize through following technical scheme:

The dropproof double-breakpoint contact system of a kind of constant pressure; It comprises the moving contact that moving contact rotating shaft and front and back are run through moving contact rotating shaft inner chamber and can be rotated around the moving contact rotating shaft; Moving contact is centrosymmetric; Its rear and front end is respectively arranged with and upper and lower two moving contacts that fixed contact point is corresponding of circuit breaker, wherein, is that symmetric points are provided with two sliding trays that all tilt to this end moving contact direction with its center in the said moving contact rotating shaft; A removable pin that stretches out to both sides is arranged in the said sliding tray; There is a pair of moving contact tension spring traction that is positioned at the moving contact rotating shaft outside at each removable pin two ends, and the said moving contact rotating shaft outside is symmetrically arranged with steady pin, and the stiff end of moving contact tension spring is connected on the steady pin; The front and back of said moving contact symmetrical centre respectively are provided with one section cam surface, and said cam surface is made up of with one section raised section in the middle of being positioned at two sections depression sections that are positioned at two ends; Said removable pin is pressed on the cam surface under the effect of moving contact tension spring all the time.

Especially, the both sides of said moving contact rotating shaft are provided with Baltimore groove, and the moving contact tension spring is positioned at Baltimore groove.

Beneficial effect of the present invention does; Sliding tray tilts to this end moving contact direction in the moving contact rotating shaft of the dropproof double-breakpoint contact system of said constant pressure, thereby guarantees moment that the moving contact tension spring produces moving contact not with the drawing high and change of tension spring, and promptly the initial pressure of contact and final pressure is constant; And moving contact is scolded out because of electrodynamic repulsion force; Make the removable pin of the peak leap moving contact tension spring of its cam surface, at this moment removable pin gets into the depression section of cam surface, because the effect of moving contact tension spring; Producing one at depression Duan Shanghui continues to the power of scolding evolution to motion moving contact; Thereby the moving contact of having avoided scolding out improves the breaking capacity of circuit breaker along with electrodynamic minimizing will can prevent effectively that contact from falling from scolding open position to the motion of make position direction.

Description of drawings

According to accompanying drawing and embodiment the present invention is done further explain below.

Fig. 1 is a perspective view of the present invention;

Fig. 2 is an end view of the present invention;

Fig. 3 is the sketch map under the moving contact closure state of the present invention;

Fig. 4 scolds the sketch map in the open procedure for moving contact of the present invention;

The sketch map that Fig. 5 scolds out for moving contact of the present invention fully.

Among the figure:

1, moving contact; 2, moving contact; 3, moving contact rotating shaft; 4, cam surface; 5, steady pin; 6, removable pin; 7, sliding tray; 8, moving contact mount pin; 9, moving contact tension spring; 10, Baltimore groove.

Embodiment

Please with reference to shown in Fig. 1-5, in present embodiment, the dropproof double-breakpoint contact system of said a kind of constant pressure; It comprises the moving contact 1 that moving contact rotating shaft 3 and front and back are run through moving contact rotating shaft 3 inner chambers and can be rotated around the moving contact rotating shaft; Moving contact 1 is centrosymmetric, and its rear and front end is respectively arranged with and the corresponding moving contact 2 of upper and lower two the fixed contact points of circuit breaker, wherein; The center of said moving contact rotating shaft 3 is provided with moving contact mount pin 8; Moving contact 1 connects as one through moving contact mount pin 8 with moving contact rotating shaft 3, is that symmetric points are provided with two sliding trays 7 that all tilt to these end moving contact 2 directions with its center in the said moving contact rotating shaft 3, and a removable pin 6 that stretches out to both sides is arranged in the said sliding tray 7; There are a pair of moving contact tension spring 9 tractions that are positioned at moving contact rotating shaft 3 outsides at each removable pin 6 two ends; Said moving contact rotating shaft 3 outsides are symmetrically arranged with steady pin 5, and the stiff end of moving contact tension spring 9 is connected on the steady pin 5, and the front and back of said moving contact 1 symmetrical centre respectively are provided with one section cam surface 4; Said cam surface 4 is made up of with one section raised section in the middle of being positioned at two sections depression sections that are positioned at two ends; Said removable pin 6 is being pressed under the effect of moving contact tension spring 9 on the cam surface 4 all the time, and said moving contact rotating shaft 3 both sides are provided with Baltimore groove 10, and the moving contact tension spring is positioned at Baltimore groove 10.

Please with reference to shown in Fig. 3-5; When flowing through short circuit current between contact of breaker; Moving contact 1 is scolded out because of electrodynamic repulsion force, makes the removable pin 6 of the peak leap moving contact tension spring 9 of its cam surface 4, at this moment the depression section of removable pin 6 entering cam surfaces 4; Because moving contact tension spring 9 effects; Produce one at depression Duan Shanghui moving contact 1 is continued to the power of scolding evolution to motion, thereby the moving contact of having avoided scolding out 1 is along with electrodynamic minimizing will promptly avoid contact to fall from scolding open position to the motion of make position direction.Under operating mechanism drives; Moving contact rotating shaft 3 from sub-gate position to fixed contact rigidly connect touch before; Moving contact 1 is constant with the relative position of moving contact rotating shaft 3, and along with moving contact rotating shaft 3 continues motion, moving contact 1 will contact with fixed contact; Thereby the generation contact pressure also begins to separate with moving contact rotating shaft 3, moves to the stroke that exceeds the quata that moving contact 1 produces regulation until operating mechanism; Because the stroke that exceeds the quata of moving contact 1 is converted the stroke value of the fixing removable pin 6 of moving contact tension spring 9 less than 1mm; Revise the direction of sliding tray 7 in the moving contact rotating shaft 3; The vertical range of the center of rotation of the line of force of moving contact tension spring 9 and moving contact 1 is with corresponding minimizing; Thereby guarantee moment that 9 pairs of moving contacts of moving contact tension spring 1 produce not with the drawing high and change of tension spring, promptly the initial pressure of contact and final pressure is constant.

Claims

1. dropproof double-breakpoint contact system of constant pressure; It comprises the moving contact that moving contact rotating shaft and front and back are run through moving contact rotating shaft inner chamber and can be rotated around the moving contact rotating shaft; Moving contact is centrosymmetric; Its rear and front end is respectively arranged with and upper and lower two moving contacts that fixed contact point is corresponding of circuit breaker; It is characterized in that: be that symmetric points are provided with two sliding trays that all tilt to this end moving contact direction with its center in the said moving contact rotating shaft, a removable pin that stretches out to both sides is arranged in the said sliding tray, there is a pair of moving contact tension spring traction that is positioned at the moving contact rotating shaft outside at each removable pin two ends; The said moving contact rotating shaft outside is symmetrically arranged with steady pin; The stiff end of moving contact tension spring is connected on the steady pin, and the front and back of said moving contact symmetrical centre respectively are provided with one section cam surface, and said cam surface is made up of with one section raised section in the middle of being positioned at two sections depression sections that are positioned at two ends; Said removable pin is pressed on the cam surface under the effect of moving contact tension spring all the time.

2. the dropproof double-breakpoint contact system of constant pressure according to claim 1; It is characterized in that: the both sides of said moving contact rotating shaft are provided with Baltimore groove, and the moving contact tension spring is positioned at Baltimore groove.