WO2005112064A1

WO2005112064A1 - Circuit-breaker and corresponding method for adjusting the same

Info

Publication number: WO2005112064A1
Application number: PCT/EP2005/052175
Authority: WO
Inventors: Alois Bierschneider; Bernhard Schmid
Original assignee: Siemens Aktiengesellschaft
Priority date: 2004-05-14
Filing date: 2005-05-12
Publication date: 2005-11-24
Also published as: BRPI0511123A; CN1954400B; EP1745496A1; DE102004024101A1; RU2366027C2; DE502005001902D1; CN1954400A; RU2006144444A; DE102004024101B4; EP1745496B1

Abstract

The aim of the invention is to adjust the distance between the plunger (5) and the tripping section (34) of a tripping arm in an improved manner in a residual-current circuit-breaker. To achieve this, the angular position of a tripping lever (32) of the tripping arm (3) can be modified about a common axis in relation to a half-shaft (7), which meshes with a force accumulator (1). Said angle is preferably modified by means of a ratchet mechanism (33, 37). This permits a precise adjustment without the need for special tools.

Description

description

Protective switching device and corresponding method for its adjustment

The present invention relates to a protective switching device with a trigger device which has a rotatably mounted trigger arm for triggering a switching device and an actuating device for actuating the trigger arm from a holding position into a trigger position with an actuating element. Furthermore, the present invention relates to a corresponding method for adjusting this protective switching device.

In the case of residual current circuit breakers or residual current circuit breakers, a so-called holding magnet (relay) is used to trigger a residual current. When the holding magnet is triggered, a downstream energy store, which can be implemented by a spring mechanism, causes the contacts of the device to be opened. For a safe

When the force accumulator is triggered, the tappet travel and the tappet force of the holding magnet are decisive. It should be noted that the ram force does not depend linearly on the ram travel.

The energy accumulator is necessary because more force is required to open the contacts of the residual current circuit breaker than the holding magnet or a corresponding holding magnet release can provide. Therefore, the necessary force is stored in the mechanics by pretensioning the spring mechanism. In order to be able to use an inexpensive and small holding magnet release, the release forces and release paths must be reduced to a minimum.

However, the components used in every residual current circuit breaker have fault tolerances. As a result, the ram travel cannot be determined as precisely as possible from the outset. Rather, the tolerances of the different positions of the coupling elements, ie the plunger relative to the trigger arm, must be compensated accordingly in order to optimally match the trigger path to the holding magnet.

The distance between the holding magnet and the energy accumulator is often adjusted by adjusting the holding magnet position with the aid of adjusting screws or with sheets that can be deformed. For example, a device for fixing a magnetic release in a residual current circuit breaker is known from the document DE 199 10 220 AI, in which ears are attached to the housing of the magnetic release, which project in opposite directions, which are perpendicular to the plunger. A fixture is provided for fixation, which has two walls running at a fixed distance parallel to each other, which have recesses into which the trigger can be inserted and latched with its ears in the direction of the plunger. The fixing device has a web that can be deformed, so that a fine adjustment of the magnetic release is made possible. In addition, the prior art cited therein describes a fixing device in which a trigger can be adjusted in order to set a certain lead time between the plunger and the lever by turning a screw, as a result of which the distance between an ear and one fixed wall is reduced.

Furthermore, the document DE 295 20 288 describes a residual current circuit breaker with a mounting part, which has a contact section for attachment to a side wall of the housing, an upper section angled toward the inside of the housing for mounting the ratchet shaft and a middle section with tabs angled toward the inside of the housing has assigned plug-in receptacle of a Fl / DI overcurrent release holder. With this arrangement, the respective parts can be assembled together with an energy accumulator, whereby the same parts can be used for both types of switchgear. loading Special advantages result from this also for mass production, because no adjustment is necessary due to the intended construction of the assembly part. This is achieved by designing the individual sections of the assembly part so that the FI / DI release can be attached with minimal tolerance to the ratchet shaft.

The object of the present invention is to provide a protective switching device in which the adjustment between the holding magnet and the trigger can be achieved in a simple manner.

According to the invention, this is achieved by means of a protective switching device with a trigger device which has a rotatably mounted trigger arm for triggering a switching device and an actuating device for actuating the trigger arm from a holding position to a triggering position with an actuating element, the trigger arm being rotated in its angular position in the holding position its axis of rotation is adjustable relative to the actuating element.

In addition, the invention provides a method for adjusting a protective switching device with a triggering device which has a rotatably mounted trigger arm, for triggering a switching device and an actuating device for actuating the trigger arm from a holding position into a triggering position with an actuating element, by adjusting the trigger arm in its angular position in the holding position about its axis of rotation relative to the actuating element.

The advantage of the type of adjustment according to the invention is that all component and assembly tolerances can be taken into account during the adjustment.

The triggering device in the protective switching device according to the invention preferably has a rotation axis of the trigger arm rotatable with this two-part half-wave, the angular position of which is predetermined by the switching device, and the trigger arm is adjustable in angle with respect to the half-wave. With this two-part system, the angle setting of the trigger arm can in principle be decoupled from the energy accumulator.

The trigger arm can also be adjustable in its angular position by means of a latching device with several latching positions. It proves to be particularly advantageous if the latching device is arranged on the trigger arm. An accurate adjustment of the trigger arm can be achieved very comfortably by the latching device.

In a likewise preferred embodiment, the half-shaft has a curved lever, and the trigger arm is pressed against the lever with a spring element. The setting function can be predetermined by the curvature of the lever, in that an adjusting element is moved along the curved lever. Thus, the maximum adjustment range of the trigger arm can also be determined via the curved lever.

The two-part design of the trigger arm and the half shaft also has the advantage that the trigger arm, which has an adjustment facility, can be manufactured as a plastic part even if the half shaft is made of metal. This means that the trigger arm can be easily manufactured despite the complex geometry.

The present invention will now be explained in more detail with reference to the drawings, in which:

1 shows a triggering mechanism of a protective switching device according to the invention; 2 shows a schematic diagram for adjusting a trigger arm; 3 shows a half-wave according to the invention;

4 shows a trigger arm according to the invention; 5 shows a leaf spring; 6 shows the trigger mechanism in a first adjustment position;

7 shows the trigger mechanism in a second adjustment position; 8 shows the trigger mechanism in a third adjustment position; and

9 shows the trigger mechanism according to the invention in a detailed representation.

The exemplary embodiment described in more detail below represents a preferred embodiment of the present invention.

A force accumulator 1 composed of several components, which is shown in FIG. 1, applies the force to open the switch contacts of a residual current circuit breaker. The release or release of the energy accumulator 1 takes place with the aid of a release device 2, the release arm 3 of which is rotatably mounted about an axis 4. The trigger arm 3 of the trigger device 2 is actuated by a plunger 5 of a holding magnet 6.

The angular position of a half-shaft 7, which can also be referred to as a latching part, is predetermined by the preloaded force accumulator 1 mounted in the housing of the residual current circuit breaker. The half-shaft 7 rotatable about the axis 4 serves to latch and unlatch the energy accumulator 1.

FIG. 2 shows the energy accumulator 1 from FIG. 1 with a release device 2 ', the release arm 3' being only shown schematically as a rectangle and symbolizing the prior art. The trigger arm 3 'is firmly connected to a half-wave 1'. In this one-piece construction of the release arm 3 'and the half shaft 1', the tolerances of the housing and the energy storage components result in an undefined position of the release arm 3 'with respect to the position of the holding magnet 6 or its plunger 5. As a result, there is an indefinite distance X between the release arm 3 'and the plunger 5 of the holding magnet 6. A distance that is too small could result in the holding magnet 6 having the necessary force for unlatching due to the reduced release path can't muster. In contrast, an excessively large distance X can, under certain circumstances, result in the rotation of the trigger arm by the plunger 5 being too small and the energy store 1 not being unlatched. For the functionality of the residual current circuit breaker, it is therefore crucial whether the distance X is set correctly.

According to the invention, the trigger arm 3 is therefore adjustable in its angular position about the axis 4. For this purpose, the half-wave 7 is separated from the trigger arm 3 according to the present example. This division into two components and common mounting on an axis 4 makes it possible to adjust the distance X.

According to FIG. 3, the half shaft 7 is provided with a curved lever 71 for this purpose. The trigger arm 3 interacts with this curved lever 71, so that the angle between the half-shaft 7 and the trigger arm 3 can be varied. For this purpose, the trigger arm 3 has a bearing section 31, on which a trigger lever 32 is molded. A latching section 33 is formed on the bearing section 31 approximately at right angles to the release lever 32. Compared to the bearing section, the release lever 32 also has a release section 34. In the vicinity of this release section 34, an adjusting lever 35 is cast onto the release lever 32 via a narrow connection point 36. At the distal end of the adjusting lever 35 there is a locking element 37 which can be locked with the locking section 33 in several angular positions with respect to a pivot point at the connection point 36. The trigger lever 32, the adjusting lever 35 and the latching section thus form approximately an isosceles triangle. In the installed state, the latching element 37 of the release arm 3 is placed on the curved lever 71 the half-wave 7 pressed by a leaf spring 8. This leaf spring 8 is shown individually in FIG. 5. The assembled state of the trigger device 2 is shown in detail in FIG.

The adjustment is now carried out by selecting a suitable latching position of the adjusting lever 35 on the latching section 33 of the trigger arm 3. This changes the angle α, which is due to the angle of intersection of the straight line from the axis of rotation 4 to the connection point 36 and the straight line from the latching element 37 the connection point 36 is defined. As already mentioned, the spring 8 presses the locking element 37 at the contact point 38 against the curved lever 71. A displacement of the adjusting lever 35 on the curved lever 71, which has a very specific contour, causes a reduction or increase in the distance X, which takes place without deformation of the parts involved and can be reset.

FIG. 6 shows an adjustment state in which the adjustment lever 35 is set in its leftmost position. Because of the contour of the curved lever 71, there is a minimum distance X between the plunger 5 and the release section 34 of 0.1 units in this position. According to FIG. 7, with an average setting of the adjusting lever 35, there is an average distance X of 0.7 units between the two components. Finally, in the outermost right latching position of the adjusting lever 35 according to FIG. 8, there is a maximum distance between the plunger 5 and the release section 34 of 1.3 units. For this purpose, the locking of the locking section 33 can be chosen to be as fine as desired in order to achieve the desired accuracy of the adjustment.

The structure of the tripping mechanism of a residual current circuit breaker selected in accordance with the exemplary embodiment described above has the following advantages. On the one hand, the trigger arm 3 preferably manufacture as a plastic part, which guarantees simple manufacture. On the other hand, no special tools are required for the adjustment process and it can be carried out, for example, using a screwdriver, tweezers or a metal pen.

Furthermore, the latching has the advantage that the distance between the plunger 5 and the trigger section 34 can be changed in defined steps. An unwanted adjustment, e.g. prevented by shaking or warming, that a force always acts against the locking.

Finally, the advantages of the selected construction are that the components can be reused in the repair and the wear between the pawl and the half-shaft can be reduced by damping the reattachment.

Claims

claims

1. Protection switching device with - a triggering device (2); which has a rotatably mounted trigger arm (3) for triggering a switching device and

- An actuating device (6) for actuating the trigger arm (3) from a holding position into a triggering position with an actuating element (5), characterized in that

- The trigger arm (3) in its angular position in the holding position about its axis of rotation (4) relative to the actuating element (5) is adjustable.

2. Protective switching device according to claim 1, wherein the triggering device (2) has a half-shaft (7) which is rotatable about the axis of rotation (4) of the triggering arm (5) and is formed in two parts, the angular position of which is predetermined by the switching device, and the triggering arm ( 3) is adjustable in angle with respect to the half-wave (7).

3. Protective switching device according to claim 1 or 2, wherein the trigger arm (3) is adjustable by a latching device (33/37) with several latching positions in its angular position.

4. Protective switching device according to claim 3, wherein the latching device (33/37) is arranged on the trigger arm (3).

5. Protection switching device according to one of claims 2 to 4, wherein the half shaft (7) has a curved lever (71) and the trigger arm (3) is pressed with a spring element (8) against the lever (71).

6. Protection switching device according to claim 5, wherein the trigger arm (3) via an element (37) of the latching device (33/37) is pressed on the curved lever (71) and the maximum adjustment range of the trigger arm (3) is predetermined by the curvature of the lever (71).

7. Protection switching device according to one of the preceding claims, wherein the trigger arm (3) is made of plastic.

8. Method for adjusting a protective switching device with a triggering device (2) which has a rotatably mounted

Trigger arm (3), for triggering a switching device and an actuating device (6) for actuating the trigger arm (3) from a holding position into a trigger position with an actuating element (5), characterized by

Adjustment of the trigger arm (3) in its angular position in the holding position about its axis of rotation (4) relative to the actuating element (5).

9. The method according to claim 8, wherein the adjustment of the trigger arm (3) by. Snap into one of several snap-in positions.