CZ19561U1 - Control mechanism of circuit breaker switching on and off - Google Patents

Abstract

The invention provides an operation mechanism, belonging to the technical field of a circuit breaker, wherein the operation mechanism is used for switching a circuit breaker placed in a separate housing, and comprises an actuating apparatus and a mechanical trip element which are fixed on two sidewalls and interconnected, the actuating apparatus is equipped with an operating lever projecting out of the housing, an actuator comprises an element for the mechanical joint of at least one pull rod of the mechanical trip mechanism and a boss for being jointed with a clamping part gear adjacent to the mechanical trip element, the mechanical trip element comprises a mechanically-jointed cam, a drive lever, a unlocking mechanism and a movable contact. The operation mechanism uses all existing principles and is simple as possible, and is switched on and off only in need of less force, moreover, the fault is indicated at the middle position of the operating level, and the contact can be tripped up and closed.

Description

Control mechanism of circuit breaker on and off

Technical field

The technical solution is in the field of circuit breakers and relates to a new design of the control mechanism for switching the circuit breaker on and off, namely the circuit breaker used for installation in fuse boxes.

BACKGROUND OF THE INVENTION

At present, a number of designs of circuit breaker designs comprising a trigger mechanism are known, the control lever of which is led outside the shaped two-piece housing. The circuit breakers are based on the principle of pulling the armature into the electromagnet at the moment when the value of the electric current exceeds the set limit, thereby moving away the fixed and movable electric contact. The movement and adjustment of the trigger mechanism is solved by various lever and linkage mechanisms, whose exemplary general designs or design of their functional nodes are evident from the documents CZ 209788, CZ 2005-515 A1, FR 2575862, FR

2630582, FR 2766292, CZ 2766292 or EP 295158. Patent CZ 293169 addresses the design of a circuit breaker with a protective shield and the technical solution according to CZ 13852 U1 relates to a trigger mechanism of a circuit breaker comprising a lever which is interposed between a contact and a protrusion on the housing. The disadvantage of this solution is that a relatively high force is required to drive away and is therefore unsuitable for systems with high contact pressure.

The aim of the present solution is to create a new design of the circuit breaker, whose control: o the mechanism would be as simple as possible using the knowledge of all the existing principles, a small tripping force required to switch it off and on.

The essence of the technical solution

The stated objective is achieved by a technical solution which is a control mechanism of switching on and off the circuit breaker stored in a split housing and comprising at least the connection terminals, arc chute, electromagnetic release and thermal release, where the actual control mechanism consists of mutually coupled actuators and mechanical release. in the sidewalls, the actuator being provided with an operating lever extending outside the housing. The principle of the solution consists in that the actuator consists of a body which is provided with at least one control rod for mechanical connection with the mechanical release and a projection for engaging the adjacent catch of the mechanical release, and that the mechanical release consists of mechanically connected cams, transfer lever, unlocking. and a movable contact, on the one hand, the cam engages the contour-shaped surface of the transmission lever over its contact surface, into which the notch releases its spring-loaded tooth, which is further provided with a switching lever, the lower end of which is wherein the release comprises a release arm of the electromagnetic release which is located opposite the face of the release core, and the movable contact of the mechanical release, pivoted on a fixed pin between the sidewalls, is provided with the release lever provided a protrusion formed opposite the protrusion of the body and at the same time opposite the catch of the switching lever, which is pivotally mounted under the actuator body.

4o Description of the figures in the attached drawings

A specific embodiment according to the invention is schematically shown in the accompanying drawings, in which:

Fig. 1 is a front axonometric view of the overall embodiment of the circuit breaker with the housing lid removed in the off position; Fig. 2 is an overall axonometric view of the circuit breaker control mechanism; Fig. 3 is an exploded view of the control mechanism of Fig. 2;

Fig. 4 is an axonometric view of the actuator without support plates; Fig. 5 shows seven basic positions of the individual parts of the actuator, namely Fig. 5a) in the off position Fig. 5b) in the position of the captured movable contact before the jump to the on position Fig. 5c) in the on position Fig. 5d) when the mechanism is unlocked in case of failure in the circuit Fig. 5e) when the mechanism is switched off, when the control lever is engaged in the position 5g) when reaching the starting position indicating the circuit breaker tripping.

Examples of technical solution

The circuit breaker consists of a shaped longitudinally divided shell housing and made of insulating material whose unmarked fronts and side walls are provided with a plurality of ribs or partition walls forming compartments for receiving the individual functional parts of the circuit breaker. In the side recesses of the housing 1 there are connection terminals 2, in its lower compartment there is a quenching chamber 3, in the middle part an electromagnetic release 4 in the form of a short-circuiting coil having a tripping core 41 and a fixed contact 42. the control mechanism 5 of the circuit breaker on and off is stored. The actuating mechanism 5 is connected by a conductor 6 to a thermal release 7 formed by a bimetallic strip, which is electrically connected to an adjacent terminal 2. The actuating mechanism 5 consists of mutually coupled actuators 51 and a mechanical trigger 52, which are mounted in contour-shaped side panels 55.

The actuator 51 is formed by a body 511 which is rotatably mounted between the sidewalls 55 and is provided with an actuating lever 512 extending outside the contour of the housing 1 and a pair of actuating rods 513 whose free ends are retained in the pivot cam 521. a cam 511 for engaging the adjacent catch 5251 of the mechanical trigger 52. The cam 521 of the mechanical trigger 52 is in engagement with the contour-shaped transfer lever 522 through the unlabeled contact surface 522, into which slot 5221 engages its biasing tooth 5231 the release lever 5232 of the thermal release 7 is attached at the lower end thereof. The release actuator 523 further includes a release arm 5234 of the electromagnetic release 4, which is located opposite the face of the release core 41. The mechanical release 52 is further provided with a movable account. pivotally mounted on a fixed pin 54 between the sidewalls 55, which engages a release lever 5241 provided with a projection 5242 formed opposite the projection 514 of the body 511 and at the same time opposite the catch 5251 of the engaging lever 525 which is pivotally mounted in the sidewalls 55 space under body 51_1. 5L drivers

To provide the necessary preload and restoring forces, the respective components of the actuator 51 and the mechanical trigger 52 are conventional unlabeled springs of the type of foils, coil springs and hairpin springs, as shown in the individual illustrations whose use and positioning in similar mecha40s is low and not the case is described in more detail.

When actuating the circuit breaker, by actuating the actuating lever 512, a push force is applied via the actuating rods 513 to the cam 521, which is secured by the transmission lever 522 and the unlocking 523, and thereby simultaneously the movable contact 524 which begins to approach the fixed contact 42. When the switch lever 525 comes into contact with the release lever 5241, the proximity of the movable contact 524 to the fixed contact 42 stops due to engagement with the projection 5242. Upon further movement of the control lever 512, the projection 514 of the body 511 begins to push the switch lever 525, which is pivoted out of engagement with the projection 5242. This causes the spring-loaded movable contact 524 to jump and release, which hits the fixed contact 42. the control lever 512 is pushed to the end position where it is held by the control rods 513 by biasing the entire mechanism.

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CZ 19561 Ul

When the circuit breaker is tripped, that is, when pressure on the control lever 512 forcefully exceeds its dead-end position, the entire mechanism of the actuator 51 and the mechanical trigger 52 begin to return to the initial position.

In the event of a breakdown core 41 of the electromagnetic release 4 striking the release 523 via the release arm 5234 5, or when the bimetallic thermal release 7 pulls the entire release 523 over the contact rod 5233, the toothing 5231 is unlocked and the transmission lever 522 is released. thereby releasing the entire actuating mechanism 5, which returns to its original state. Subsequently, the body 511 also returns to its original state, the projection 514 contacts the projection 5242 of the unlocking lever 5241, and the control lever 512 remains in an intermediate position that visually characterizes the type of failure. The control lever 512 returns to the initial position by further pushing.

The described design of the circuit breaker using the technical solution of the actuator is not the only possible design variant, but without affecting its nature it is possible to suitably adjust the shape of the individual structural elements of the actuator 51 and the mechanical release 52 while maintaining its functionality as a whole.

Claims (1)

PROTECTION REQUIREMENTS A control mechanism (5) for switching on and off a circuit breaker housed in a split housing (1) and comprising at least connection terminals (2), an arc quench (3), an electromagnetic release (4) and a thermal release (7), 5) consists of mutually coupled 20 actuators (51) and triggers (52), which are mounted in sidewalls (55), the actuator (51) being provided with an operating lever (512) extending outside the housing (1), characterized in that the actuator (51) is formed by a body (511) provided with at least one actuating rod (513) for mechanical engagement with the mechanical trigger (52) and a projection (514) for engaging an adjacent catch (5251) of the mechanical trigger (52), and that the mechanical trigger (52) it consists of a mechanically coupled cam (521), a transmission lever (522), a release (523) and a movable contact (524), on the one hand the cam (521) engaging the contour-shaped surface of the transmission lever (522) over its interface into which the notch (5231) fits with its prong (5231) a spring-loaded release (523) which is further provided with a switching lever (5232), at the lower end of which the contact rod (5233) of the thermal release (7) is attached; of the sucker (523) is tripping The arm (5234) of the electromagnetic release (4), which is located opposite the face of the tripping core (41), and the movable contact (524) of the mechanical release (52). mounted pivotably on a fixed pin (54) between the sidewall (55), it engages an unlocking lever (5241) provided with a projection (5242) formed opposite the projection (514) of the body (511) and opposite catch (5251) of the switching lever (525) which is pivotally mounted below the body (511) of the actuator (51).