CN2228686Y

CN2228686Y - Small breaker

Info

Publication number: CN2228686Y
Application number: CN 94246880
Authority: CN
Inventors: 陈景武; 陈景正
Original assignee: SHUANGLING ELECTRIC APPLIANCES COMMERCIAL AND INDUSTRIAL Co WENZHOU CITY
Current assignee: SHUANGLING ELECTRIC APPLIANCES COMMERCIAL AND INDUSTRIAL Co WENZHOU CITY
Priority date: 1994-12-04
Filing date: 1994-12-04
Publication date: 1996-06-05
Anticipated expiration: 2004-12-04

Abstract

The utility model relates to an improvement of a small breaker, comprising a casing, a static contact, a movable contact, an actuating mechanism, an excess load protection mechanism and a short-circuit protection mechanism. The actuating mechanism is composed of a handle, a connecting bar, a contact support, a jumping pin and an extension spring. The handle is connected with the contact support via the connecting bar. The movable contact is arranged at the fore part of the contact support, while the jumping pin is arranged on the rear part of the contact support. The extension spring is arranged between the rear part of the movable contact and the handle body. The overload protection mechanism and the short-circuit protection mechanism are integrated in one which is composed of a magnet yoke, a bimetal leaf, an armature and a torsion spring. The small breaker has features of compactness, favorable breaking capacity, and stable and reliable performance, etc.

Description

Miniature circuit breaker

The utility model relates to a kind of improvement of miniature circuit breaker.

At present, the miniature circuit breaker that domestic common rated current is lower than 63A has that volume is big, the relatively poor shortcoming of breaking capacity, then all the more so to rated current greater than the miniature circuit breaker of 63A, as DZ12 series miniature circuit breaker, this can not satisfy the demand of modern society to circuit breaker miniaturization, high breaking capacity, reliable and stable performance.

The purpose of this utility model provides the miniature circuit breaker of a kind of rated current at 40～80A, and it can overcome the above-mentioned defective of existing miniature circuit breaker existence and become the miniature circuit breaker that a kind of volume is little, breaking capacity is high, stable and reliable for performance.

The purpose of this utility model is to realize like this.A kind of miniature circuit breaker; comprise housing; fixed contact; moving contact; operating mechanism; overload protecting mechanism; short current protective mechanism; operating mechanism is by handle; connecting rod; contact supporting; tripping; extension spring constitutes; handle handlebody is with a highlight outward; one end of connecting rod is connected with the highlight of handle handlebody periphery; the other end is connected with contact supporting; moving contact is arranged on the front portion of contact supporting; and the fulcrum (a by its both sides; a ') is connected with contact supporting; tripping is arranged on the rear portion of contact supporting; and the fulcrum (b by its both sides; b ') is connected with contact supporting; extension spring is connected between handle handlebody and the moving contact rear portion; handle is by the fulcrum (c at its center, handle body both sides; c ') is connected with housing; the tie point of connecting rod one end and contact supporting forms fulcrum d; housing is provided with for fulcrum (b; b '); fulcrum d; and the rail groove that moves of connecting rod; along with the operating mechanism closure; disconnect; the variation of different conditions such as dropout; fulcrum (b; b '); fulcrum d and connecting rod will be on the housing separately rail groove move, thereby drive contact supporting and moving contact moves.Overload protecting mechanism and short current protective mechanism integrate becomes overload and short current protective mechanism; by yoke; bimetal leaf; armature; torsion spring constitutes; the upper end of bimetal leaf is connected with the upper end of yoke; this link is fixed on the housing; the lower end of bimetal leaf and the lower end of the armature gap that is separated by; armature is by the fulcrum (e of its both sides, upper end; e ') is connected with housing; torsion spring is arranged on armature and has fulcrum (e; e ') a end; the centre bore that is torsion spring is enclosed within on the axial location of fulcrum (e, e '), and one of torsion spring is fixed on the housing; the other end is fixed on the armature.When operating mechanism is in closure state, the tripping lock-bit is on armature, handle promotion connecting rod moves down contact supporting along the rail groove of fulcrum C, connecting rod is the relative fixed state in its rail groove on housing, moving contact is contacted with fixed contact, at this moment, because the moving contact rear portion is strained by extension spring, correspondingly apply a downward pressure, make the contact of procephalic contact of movable contact and fixed contact more closely to contact and maintain enough excess of stroke in the moving contact front portion.When operating mechanism transfers off-state to by closure state, turning handle, the handle drivening rod leaves it in the get on the right track relative fixed position of groove of housing, so, the pulling force of extension spring turns to open position with handle, handle rises contact supporting via connecting rod, moving contact separates with fixed contact, and, because the peripheral highlight of end of connecting rod and handle handlebody is connected, along with the rotation of handle, the radius of gyration of this tie point is bigger, cause the moving range of connecting rod bigger, the displacement of contact supporting and moving contact is also bigger, has the bigger distance of opening between moving contact and the fixed contact.When operating mechanism transfers trip status to by closure state, i.e. circuit overloads, the electric current of the miniature circuit breaker of flowing through surpasses its rated current, and bimetal leaf is outwardly-bent, promotes armature tripping is threaded off; Perhaps short circuit, the electric current of miniature circuit breaker of flowing through increases suddenly, yoke produces stronger magnetic field and makes armature adhesive with it, tripping is threaded off, then owing to the pulling force of extension spring, round fulcrum d, the contact supporting band moving contact and is broken away from fixed contact and rise, be with tripping along fulcrum (b, b ') rail groove moves down, and handle is got back to open position simultaneously.

The purpose of this utility model can also realize like this.Aforesaid miniature circuit breaker; the overload and a face of short current protective mechanism yoke, b face, c face respectively with a of armature; face, b; face, c; face is corresponding; work as short circuit, a of yoke, b, three faces of c then contact with three faces of a ', b ', c ' of armature respectively and become cylinder-shapedly, and the bimetal leaf place should be in cylindrical shell.Three faces like this contact, and have increased the contact-making surface of yoke and armature.

The purpose of this utility model can also realize like this.Aforesaid miniature circuit breaker, an end that is connected with bimetal leaf in yoke is provided with adjustment screw A, is provided with adjustment screw B at the other end of yoke, adjustment screw A is in order to regulate bimetal leaf and the armature spacing of septal space mutually, make when circuit overloads, bimetal leaf is crooked and promote armature in official hour, and tripping is threaded off; Adjustment screw B makes at short circuit, when short circuit current reaches setting in order to regulate the spacing between yoke and the armature, armature and yoke adhesive, and tripping is threaded off.

The utility model is owing to the setting and the connecting rod of the peripheral highlight of handle handlebody are connected between peripheral highlight of handle handlebody and the contact supporting, so have the bigger distance of opening between its moving contact and the fixed contact, correspondingly, opening that its volume reduces under certain situation between moving contact and the fixed contact; Simultaneously because the contact area of integrated design, yoke and the armature of overload and short current protective mechanism is big, so its breaking capacity height; Moreover because moving contact and tripping are arranged on the front and rear part of contact supporting, the fulcrum (a that moving contact passes through its both sides, a ') its action of variation of rear portion that be connected with contact supporting, extension spring acts on moving contact and the various states of operating mechanism is subjected to fulcrum (b, b,) be the tie point of tripping and contact supporting, tie point, the connecting rod restriction of certain tracks groove on housing certainly that fulcrum d is connecting rod and contact supporting, so its is stable and reliable for performance.

Fig. 1 is the miniature circuit breaker structural representation that the utility model proposes;

Fig. 2 is miniature circuit breaker overload and the short current protective mechanism structural representation that the utility model proposes;

Fig. 3 is that the miniature circuit breaker closure state that the utility model proposes is operated the mechanism structure schematic diagram down;

Fig. 4, to be the miniature circuit breaker that the utility model proposes transfer the change in location schematic diagram that its connecting rod of closure state moves in the specific rail groove to by off-state on housing.

Introduce embodiment of the present utility model below in conjunction with accompanying drawing.As shown in Figure 1, miniature circuit breaker comprises: housing (1), fixed contact (2), moving contact (3), operating mechanism, overload and short current protective mechanism.Operating mechanism is by handle (4), connecting rod (5), contact supporting (6), tripping (7), extension spring (8) constitutes, handle (4) is by the fulcrum (c at its center, handle body both sides, c ') is connected with housing (1), the external highlight that is with of handle (4) handle, one end of connecting rod (5) is connected with the highlight of handle (4) handle body periphery, the other end is connected with contact supporting (6), the front portion of contact supporting (6) is provided with moving contact (3), the rear portion is provided with tripping (7), moving contact (3) is by the fulcrum (a of its both sides, a ') is connected with contact supporting (6), tripping (7) is by the fulcrum (b of its both sides, b ') is connected with contact supporting (6), extension spring (8) is connected between handle (4) handle body and moving contact (3) rear portion, fulcrum (b, b), the fulcrum d that the tie point of connecting rod (5) and contact supporting (6) forms, and connecting rod (5) can be respectively on housing separately rail groove A on (1), B, C moves.Overload and short current protective mechanism are by yoke (9); bimetal leaf (10); armature (11) and torsion spring (12) constitute; the upper end of bimetal leaf (10) is connected with the upper end of yoke (9); and this link is fixed on the housing (1); the gap that is separated by, the lower end of the lower end of bimetal leaf (10) and armature (11); armature (11) is by the fulcrum (e of its both sides, upper end; e;) be connected with housing (1); torsion spring (12) is arranged on armature (11) and has fulcrum (e; e ') a end; and be in fulcrum (e; e ') on the axial location; one of torsion spring (12) is fixed on the housing (1); the other end is fixed on the armature (11); on armature (11), there is one to be used for being under the closure state lock-bit hole with tripping (7) lock-bit at operating mechanism; an end that is connected with bimetal leaf (10) in yoke (9) can also be provided with adjustment screw A (14), can also be provided with adjustment screw B (15) at the other end of yoke (9).Between the tail end of moving contact (3) and bimetal leaf (10), be connected, between yoke (9) and lead-in clamp (15), also be connected with lead with lead.Fixed contact (2) is fixedly mounted on the housing (1), and its tail end is connected with output wiring terminal (16), and the space between fixed contact (2) and moving contact (3) also is provided with arc-extinguishing mechanism, and it is arranged by some arc quenching plates (17) and forms.As shown in Figure 2; three faces of a, b, c that overload and short current protective mechanism can also be designed to yoke (9) are corresponding with armature (11) a ', three faces of b ', c ' respectively; when short circuit; three faces of a, the b of yoke (9), c then contact with three faces of a ', b ', c ' of armature (11) respectively and become cylinder-shapedly, and bimetal leaf (10) is in this cylindrical shell.

As shown in Figure 1, the operating mechanism of miniature circuit breaker is in off-state, and handle (4) is in open position, and extension spring (8) is tightened, and tripping (7) is in the lock-bit hole of armature (11), and moving contact (3) is separated with fixed contact (2).As shown in Figure 3, the operating mechanism of miniature circuit breaker is in closure state, handle (4) is in make position, tripping (7) is in the lock-bit hole of armature (11), moving contact (3) is closed mutually with fixed contact (2), and extension spring (8) is drawn back and the contact of moving contact (3) and the contact of fixed contact (2) are closely linked more.Desire transfers miniature circuit breaker to closure by disconnection, be about to operating mechanism and transfer closure state to by off-state, should push handle (4) to make position from open position earlier, at this moment, tripping (7) is still in the lock-bit hole of armature (11), handle (4) drivening rod (5) moves to position II from position I along the rail groove C on the housing (1), is tending towards relative fixed at last, as shown in Figure 4; Simultaneously, the rail groove A that connecting rod (5) promotion contact supporting (6) is gone up fulcrum d along housing (1) moves, moving contact (3) is contacted with fixed contact (2), because extension spring (8) acts on the rear portion of moving contact (3), fulcrum (a that is connected with contact supporting (6) by its both sides, a ') the anterior contact of moving contact (3) then more closely contacts with the contact of fixed contact, to maintain enough excess of stroke, as shown in Figure 3.Work as circuit overloads, the electric current of miniature circuit breaker of flowing through surpasses its rated current, bimetal leaf (10) is outwardly-bent, direction shown in arrow among Fig. 2, promoting armature makes the tripping dropout or works as short circuit, the electric current of miniature circuit breaker of flowing through increases suddenly, yoke (9) produces stronger magnetic field and makes armature (11) adhesive with it, and tripping (7) is threaded off, at this moment, miniature circuit breaker transfers dropout to by closure, operating mechanism transfers trip status to by closure state, because the pulling force of extension spring (8), is being with moving contact (3) to break away from fixed contact (2) and rises round fulcrum d contact supporting (6), be with tripping (7) along fulcrum (b, b) rail groove B move down; Simultaneously, handle (4) is got back to open position.

Claims

1, a kind of miniature circuit breaker comprises: housing (1), fixed contact (2), moving contact (3), operating mechanism, overload protecting mechanism, short current protective mechanism is characterized in that:

A, operating mechanism is by handle (4), connecting rod (5), contact supporting (6), tripping (7), extension spring (8) constitutes, the outer highlight that is with of handle (4) handle body, one end of connecting rod (5) is connected with the highlight of handle (4) handle body periphery, the other end is connected with contact supporting (6), moving contact (3) is arranged on the front portion of contact supporting (6), and the fulcrum (a by its both sides, a ') is connected with contact supporting (6), tripping (7) is arranged on the rear portion of contact supporting (6), and the fulcrum (b by its both sides, b ') is connected with contact supporting (6), extension spring (8) is connected between handle (4) handle body and moving contact (3) rear portion, handle (4) is by the fulcrum (c at its center, handle body both sides, c ') is connected with housing (1), variation along with the operating mechanism different conditions, fulcrum (b, b '), the fulcrum d that the tie point of connecting rod (5) one ends and contact supporting (6) forms, and connecting rod (5) can be on the housing (1) separately rail groove move;

B; overload protecting mechanism and short current protective mechanism integrate becomes overload and short current protective mechanism; by yoke (9); bimetal leaf (10); armature (11) and torsion spring (12) constitute; the upper end of bimetal leaf (10) is connected with the upper end of yoke (9); this link is fixed on the housing (1); the gap that is separated by, the lower end of the lower end of bimetal leaf (10) and armature (11); armature (11) is by the fulcrum (e of its both sides, upper end; e ') is connected with housing (1); torsion spring (12) is arranged on armature (11) and has fulcrum (e; e ') upper end; and be in fulcrum (e; e ') on the axial location, one of torsion spring (12) is fixed on the housing (1); the other end is fixed on the armature (11).

2, miniature circuit breaker according to claim 1; it is characterized in that: overload and three faces of a, b, c of short current protective mechanism yoke (9) contact with three faces of a ', b ', c ' of armature (11) respectively and become cylinder-shapedly, and bimetal leaf (10) is in this cylindrical shell.

3, miniature circuit breaker according to claim 1 and 2 is characterized in that: be provided with at yoke (9) and bimetal leaf (10) link and adjust screw A (13), be provided with at the other end of yoke (9) and adjust screw B (14).