CN1056705C

CN1056705C - Electrical apparatus and notably circuit breaker equipped with safety device

Info

Publication number: CN1056705C
Application number: CN96105766A
Authority: CN
Inventors: 米歇尔·拉扎雷思; 菲利普·德尔卡姆博里
Original assignee: Schneider Electric SE
Current assignee: Schneider Electric SE
Priority date: 1995-04-13
Filing date: 1996-04-13
Publication date: 2000-09-20
Anticipated expiration: 2016-04-13
Also published as: DE69621695D1; HU218957B; HUP9600942A3; EP0737991A1; ES2176422T3; FR2733087B1; HUP9600942A2; EP0737991B1; ATE219282T1; CN1139287A; HU9600942D0; FR2733087A1; DE69621695T2

Abstract

The circuit breaker includes the mechanism which prevents a short circuit locking the circuit breaker solid. The mechanically driven arm (44) drives the drum. The drum drives an arm (39) in turning opening and closing the contact breaker arm (34) and contacts (31,33). The drum has a circular notch in it (45) holding a solid section (47). When the drum and the solid section separate, because of the contacts solidifying a mechanical chain of events is initiated to apply a predetermined force above that required to break the solidified contact connection.

Description

The electric equipment and the circuit breaker that have safety device

The present invention relates to a kind of electric equipment that has safety device, particularly a kind of circuit breaker, this device is set prevents that after along with a short circuit moving contact is fused to the padlock under the situation on the fixed contact, this equipment is equipped with a manual operation handle, it is arranged to and can turns to or a normally open position or the normally closed position of opening corresponding to described contact corresponding to the described closing of contact around an axle, and operating mechanism is housed, and the control transmission to of its described operating grip is supporting the pivot arm of described moving contact.

Along with short circuit, the electric contact of circuit breaker may take place be fused together.Can see that also though the contact of welding remains closed, the operator still can manage to open the manual operation handle and the latched position that moves it so-called padlock position.This can make the distortion of contact opening operation mechanism naturally, yet, it is limited causing the required power of this distortion, and is no more than certain fracture threshold value of determining of organ, particularly is no more than the kinking threshold value of the connecting rod of some operating grips when some circuit breakers are connected in series.Therefore, the operator when he moves to the contact open position with operating grip and think that he has cut off power circuit thus, but the contact of these weldings still closed and still make circuit charged, the operator then can face a danger.

Purpose of the present invention, eliminate this danger by on related electric equipment, installing a fully safe device exactly, this goal of the invention reaches by electric equipment of the present invention, wherein, this safety device comprises a backstop, it is as the described operating grip of braking, the position that this backstop the normally open position with respect to a correspondence is angular variation, it is fully big that this deviation angle is wanted, when described contact weld together the time,, operating grip make the power that puts on the operating grip against living this backstop more than or equal to a predetermined threshold value for being moved to.

Preferably corresponding to the breakaway of the basic element of character of equipment, described breakaway is limited by standard described predetermined threshold value.

In a preferred embodiment of equipment, wherein the drum of support operation handle comprises a groove, it is arranged to align with opening set on the sidewall of device housings and can carry out described padlock, the position that described opening described groove when being in corresponding the position that applies following power when operating grip occupies and be angular variation, the numerical value of described power equals described predetermined threshold value together the time in contact weld.

The present invention will by with reference to accompanying drawing to the description of embodiment and more clear, it is as non-limiting instance, in the accompanying drawing:

Fig. 1 is the partial view of the electric equipment of prior art, and wherein open the contact, and operating grip is to be in to open and the padlock position;

Fig. 2 is the view similar with Fig. 1, and just wherein the contact is welded together;

Fig. 3 is the partial view of electric equipment of the present invention, and wherein open the contact, and operating grip is to be in to open and the padlock position;

Fig. 4 is the view similar with Fig. 3, and just wherein the contact is welded together, and operating grip ineffectually moves to first centre position;

Fig. 5 is the view similar with Fig. 4, just wherein operating grip move to by constraining force second centre position and

Fig. 6 is the view similar with Fig. 3, and it is in the non-padlock position of opening.

See figures.1.and.2, the equipment that illustrates partly is a circuit breaker 10 at this, comprise: pair of contact, one of them 11 is fixed, and it is installed in one and supports on 12, it is connected with a binding post of circuit breaker in a not shown manner, and its another contact 13 is movable.This moving contact is positioned at can be on an end of one 15 arm 14 that rotates, and it can be called movable contact arm.Axle 15 is installed on the fixed head 16, this plate is also supporting a breech lock 17, it be hinged on one be fixedly connected on plate 16 the axle 18 on, breech lock is connected in an end of a bar 19, this end is hinged on 1: 20 on the described breech lock, the other end of this bar 19 is hinged on 1: 21 on the drum 22 that axle 23 rotates, and its axis 23 is supporting manually operating grip 24.Drum 22 is placed in the suitable cavity of Shell of circuit breaker, it comprises a groove 25, open in the contact and when operating grip being moved to be pressed against on the backstop 26 that is fixedly connected on the described housing, it and opening 27 along this housing sidewall setting align and allow to pass a sealing filament 28, lock bow or other locking devices.The structure of parts shown in Figure 1 is corresponding to normal conditions, and its contact is free and be not welded together, and the manual operation handle just in time acts on the moving contact by operating mechanism.

Fig. 2 represents this identical device 10, and at this moment, after short circuit,

contact

11 and 13 is welded together.Can see that though the closing of contact, manual operation handle 24 still can be moved to and lean backstop 26, and groove 25 moves to by this way towards the opening 27 that is arranged on the housing sidewall, make and to carry out the padlock operation.In order to reach this state, the operator must give the operating grip reinforcing, and this consequence of bar 19 distortion occurs making.The power that applies should be less than one by limit value or threshold value that standard limited, surpass this threshold value, the power that applies makes the whole fracture of mechanism, and at this below threshold value, the power that applies only can cause the distortion of this bar, can not make the operator form danger owing to circuit does not cut off.

With reference to Fig. 3, show equipment 30, in this case, as previously mentioned, circuit breaker comprise one be fixed on one support that fixed contact 31 on 32 and one is positioned at can be around the moving contact 33 on one 35 arm 34 1 end that rotate.This is supported by a fixed head 36, and it is also supporting a breech lock 37, and it is hinged on the axle 38 that is fixed in this plate.Bar 39 is connected in described breech lock 37 on 40 on one point, and is connected in drum 42 on 41 on one point, and it can rotate and support manually operating grip 44 around one 43.Drum 42 has a groove 45, open and operating grip moves to (not shown) when being pressed against on the backstop 46 that is fixedly connected on device housings when contact 31 and 33, it aligns with an opening 47 along this housing sidewall setting and allows to pass one section sealing filament or lock bow.

With respect to equipment shown in Figure 1, Fig. 3 equipment has following improvement:

-stop 46 with respect to backstop 26 (being shown in broken lines among Fig. 3) institute according to the position angular displacement alpha angle;

-along the set opening 47 of shell side wall with respect to opening 27 (illustrating with line among Fig. 3) institute according to the position angular displacement alpha angle.

Corresponding to normal conditions, its

contact

31 and 33 is free and be not welded together by the structure of parts shown in Figure 3, and manual operation handle 44 just in time acts on the moving contact by operating mechanism.

Fig. 4 indication equipment 30, in its structure, after short circuit, contact 31 and 33 is welded together, and operating grip 44 mediates and not distortion of bar 39, and groove 45 does not align with opening 47, and making can not padlock equipment.

When the operator applies one when opening the power of direction on operating grip 44, equipment will enter a position corresponding to Fig. 5, shown in structure corresponding to a constraining force or standard threshold value, following mechanism can not destroy fully in this value, and the basic element of character of mechanism can damage more than it.Can see that in this case, manual operation handle 44 is not to be pressed on the backstop 46, and groove 45 do not align with opening 47, thus can not padlock equipment.The power that applies if the operator promotes operating grip is during greater than described threshold value, just the basic element of character of damage equipment inevitably.

Fig. 6 indication equipment is along with being in the non-padlock position of opening after the common tripping operation.Can see that groove does not align with opening 47 and prevents padlock.Have only operating grip 44 pushed against to backstop 46 and just may carry out padlock.

In Fig. 6, a stage clip 50 can be provided, its mounting means is to be tending towards resisting the motion of operating grip 44 in its terminal stage, that is to say, and opposing is pressed onto the motion of the position of backstop 46, and this moment,

contact

31 and 33 was freely.Opened in the contact but do not reach the motion stage of padlock position as yet, spring 50 is counter on operating grip to add a definite resistance.Put on power on the operating grip by making the operator strengthen it, this resistance makes it more be absorbed in the operation that it is being carried out.

Very clear, spring can be replaced by frictional force or any device that other has same function and attract operator's attentiveness.

Claims

1, a kind of electric equipment that has safety device, particularly a kind of circuit breaker, this device is provided with to be fused under the situation on the fixed contact (31) in order to a moving contact (33) after along with short circuit and prevents padlock, this equipment is equipped with a manual operation handle (44), it is arranged to can be around a normally open position that turns to or open corresponding to described contact or corresponding to a normally closed position of the described closing of contact, and an operating mechanism is housed also, the control of its described operating grip is delivered to a pivotal arm (34) that is supporting described moving contact, it is characterized in that, this safety device comprises a backstop (46), it is as braking described operating grip (44), the position that this backstop the normally open position with respect to a correspondence is angular variation, it is enough big that this deviation angle is wanted, for operating grip is shifted to against living this backstop, in described contact weld together the time, the power on the operating grip of putting on is greater than or equals a predetermined threshold value.

According to the described equipment of claim 1, it is characterized in that 2, described predetermined threshold value is corresponding to a breakaway of the equipment basic element of character.

According to the described equipment of claim 2, it is characterized in that 3, described breakaway is limited by standard.

4, according to the described equipment of claim 1, it is characterized in that, the drum (42) that is supporting operating grip comprises a groove, it is arranged to align with an opening set on the apparatus casing sidewall and can carry out described padlock, described opening (47) is in the position that occupies when applying the pairing position of following power with respect to described groove (45) at operating grip (44) and is angular variation, and (31,32) equal described predetermined threshold value to the numerical value of this power when being welded together in described contact.

According to claim 1 or 4 described equipment, it is characterized in that 5, the described angular variation of backstop (46) and opening (47) obviously equates.

According to the described equipment of claim 1, it is characterized in that 6, it comprises a flexible member, it is arranged in a certain mobile phase of operating grip one on the opposing manual operation handle (44) and determines resistance and make it shift to the padlock position.