DE102017204293B3 - Electrical device with integrated separation device - Google Patents

Abstract

The invention relates to an electrical device (1) with an integrated separating device (A), wherein in the region of the separating device (A) a powdery or granular extinguishing medium (LM) is arranged, wherein in the non-triggered state of the separating device (A) the extinguishing medium (LM ) is spatially fixed in a volume, wherein in the triggered state of the separation device (A) the extinguishing medium (LM) penetrates into the separation point, wherein in the non-triggered state, the extinguishing medium (LM) is pressed and / or in a thermally degradable intermediate layer (Z) is kept separate from the separating device (A).

Description

The invention relates to an electrical device with an integrated separation device.

Background of the invention

Separators are needed in many areas of electrical engineering. There is always the problem that separators should be safe, but the cost of production should not be too high.

Cut-off points are usually designed so that a certain point is designed so that activated by thermal action (or other influences) an electrical connection is interrupted. Thus, e.g. a separation point can be made available particularly simply by providing an electrical connection by means of solder, wherein one end of the electrical connection is under mechanical prestress so that it is moved away from the other electrical conductor in the event of softening of the solder and thus an interruption is made available.

In particular, the switching off of direct currents is a problem, since - unlike alternating currents - there is no natural zero crossing, which causes an arc, as typically occurs in the separation, to extinguish and thus the flow of current to interrupt.

Especially in the field of surge protection devices, this is problematic.

Although overvoltage protection devices have a certain self-extinguishing capability in order to go into a safe state in the event of a fault, this is generally not designed for larger fault currents or line sequence currents that occur.

To ensure a safe separation, great efforts have been made in the past. Typically, the distance of an arc was artificially prolonged and / or blown by hard-gas materials of the arc. In this case, moving parts (not only at the separation point itself) are used, which must be free of any obstruction for proper function. Since this obstruction freedom is critical, great care must be taken in the production, so that no disturbing a movement substances are introduced.

From the DE 10 2011 055 425 A1 is an electrical device with an integrated separation device known. The separation point is angordnet a housing, wherein in the region of the separation point enclosed in the housing surrounding powdery extinguishing medium is provided, so that in the case of separation, the extinguishing agent penetrates into the separation point. However, a proper function of the separation by the surrounding extinguishing medium with respect to the separation point is not always guaranteed here.

From the JP H10-208 726 A Another device is known in which a cutting edge acts on a conductor by means of an expanding material and thus provides a separation point.

Larger occurring fault currents are typically switched off via an upstream, discrete fuse and thus the safe state is established. Fuses consist of a fusible link, which melts when a defined energy is exceeded and thus disconnects the circuit.

Such fuses are usually installed as an independent element in an overvoltage protection device, so that the surge protection device provides the user only two connections.

Based on this situation, it is an object of the invention to provide an improved electrical device with an integrated separating device, which makes it possible to provide a structurally small and cost-effective separating device.

The object is achieved by a device according to claim 1. Further advantageous embodiments are in particular subject of the dependent claims.

• 1 eine Ausführungsform einer Abtrenneinrichtung gemäß einer ersten Ausführungsform,
• 2 eine Schnittansicht der Ausführungsform der 1,
• 3 eine weitere Ausführungsform in einem ersten Zustand,
• 4 die weitere Ausführungsform der 3 in einem zweiten Zustand,
• 5 eine noch weitere Ausführungsform einer Abtrenneinrichtung gemäß Ausführungsformen der Erfindung, und
• 6 eine andere, weitere Ausführungsform einer Abtrenneinrichtung gemäß Ausführungsformen der Erfindung.

The invention will be explained in more detail with reference to the figures. In these shows:

• 1 an embodiment of a separating device according to a first embodiment,
• 2 a sectional view of the embodiment of the 1 .
• 3 another embodiment in a first state,
• 4 the further embodiment of the 3 in a second state,
• 5 a still further embodiment of a separating device according to embodiments of the invention, and
• 6 another, further embodiment of a separation device according to embodiments of the invention.

Hereinafter, the invention will be illustrated in more detail with reference to the figures become. It should be noted that various aspects are described, which can be used individually or in combination.

That Any aspect may be used with different embodiments of the invention, unless explicitly illustrated as a mere alternative.

Furthermore, in the following, for the sake of simplicity, usually only one entity will be referred to. Unless explicitly stated, however, the invention may also have several of the entities concerned. As such, the use of the words "a," "an," and "an" is only to indicate that, in a simple embodiment, at least one entity is used without precluding the use of multiple entities.

In 1 is a disconnecting device A of an electrical device 1 shown. The separating device A can, for example - as in 2 shown in section - be wedge-shaped and drive between two contacts of a separation point.

In the separation device A is a powdery or granular extinguishing medium LM arranged. This extinguishing medium LM can be provided, for example, in a suitable envelope or as a compact.

Pressling should be understood to include both a pure extinguishing material and a compound comprising the extinguishing material.

In the untripped state of the separator A is the extinguishing medium LM in a volume, namely the recess in the separating device A, spatially fixed.

In the triggered state of the separator A, for example, moves the slider-like separator over the separation point, and the extinguishing medium LM can now penetrate into the separation point, with the for the extinguishing medium LM available volume is increased.

That purely by the mechanical movement is now spent the extinguishing medium at the location of the separation point. There is more volume available at the point of separation because the separated conductors need space. Therefore, then the extinguishing agent can be released either by the action of gravity or by separating an intermediate layer or sheath into the now enlarged volume. This can cause the arc to extinguish.

In 3 is another embodiment of a separator A in a first untreated state and in 4 shown in a second triggered state.

Again, in the area of the stamp-type separating device A is a powdery or granular extinguishing medium LM arranged. This extinguishing medium LM can be provided, for example, in a suitable envelope or as a compact.

Will now be the separation point TS as in 4 triggered, the separating device A (for example, by releasing a spring) (further) pushes over the separation point TS , This is the previously held extinguishing medium LM released and pushed into the separation point. The available volume can be formed like a trough.

In 5 and 6 further embodiments are shown. In this case, again in the region of the separating device A is a powdery or granular extinguishing medium LM , In the 5 and 6 only the first state is shown. If an arc now arises at the separating device, then the extinguishing medium is released, for example by an intermediate layer Z , which keeps the extinguishing medium in the first state of the separation point is thermally affected.

Without limiting the generality of the invention, the extinguishing agent LM Sand, in particular quartz sand, and / or polyoxymethylene (POM) and / or other hard-gas materials either as a mixture, sintered, pressed, or as a composite. That is, the extinguishing agent may, for example, have (quartz) sand in a (thermally degradable) binder.

In particular - as in 1 and 2 shown - the extinguishing medium LM be pressed.

Alternatively or additionally - as in the 5 and 6 shown - the extinguishing medium LM by means of a thermally degradable intermediate layer Z be kept separate from the separating device (A). A thermally degradable intermediate layer Z For example, it may be made from paper such as tissue paper, and / or a polymeric film such as polyethylene (PE), wax, etc. The thermally degradable intermediate layer Z must be carried out only in such a way that in the context of the separation of these is affected locally under the action of the arc and / or the thermal effect of the separation, so that the extinguishing agent LM can penetrate from the previous volume.

Without limiting the generality of the invention, the extinguishing medium LM by thermal action and / or mechanical action are released.

In the in 5 and 6 illustrated embodiments, the separating device A on a circuit board P arranged. For example, the separator A may connect as a via (often referred to as VIA) between two tracks LE1 and LE2 be executed. Through-holes can be suitably dimensioned so that a certain energy input is sufficient to bring the via-hole to melt and thus to split.

In this case, the extinguishing medium LM first be separated from the separator A. For this purpose, it is advantageous only an intermediate layer Z provided. In addition, the extinguishing agent can still with a cap K be provided. The cap K may be made of a suitable material and serve different purposes, depending on the design of the extinguishing agent. For one thing, the cap K - similar to the intermediate layer Z - For a spatial fixation of the extinguishing agent LM to care. On the other hand, the cap K together with the intermediate layer Z and the extinguishing agent after the preparation of a separation point A cost-effective and production technology advantageous suitable assembled together.

In the 5 For example, the cap K in the area BF with the board P be soldered so that the extinguishing medium LM as well as the intermediate layer Z is fixed in the region of the separating device A.

In 6 however, the cap will K in the area BF connected to the board, for example by a mechanical locking, so that the extinguishing medium LM as well as the intermediate layer Z are fixed in the region of the separating device A.

Particularly advantageous, the invention can be used in a device having an overvoltage protection device.

In this case, the overvoltage protection device may in particular be selected from a group having varistor, spark gap, gas arrester, transient voltage suppressor diode.

Therefore, the electrical device may also be an overvoltage protection device.

The invention makes use of the fact that previously incompatible ideas can be combined with each other by a suitable embodiment.

It is now possible to combine a separating device A with the extinguishing effects of an extinguishing medium.

The securing effect is - at least partially - integrated into the separating device A. By means of the spatially (in the first state fixed) extinguishing medium, a targeted increase in the extinguishing ability is provided at the location of the separation point in the event of separation. Therefore - in contrast to previous arrangements - parts of the separation device remain movable, as well as granular / free-flowing extinguishing media LM become free only in the case of separation and thus does not hinder the movement, for example, the separating device A.

That is, includes the separating device - as in the 1 - 4 shown, mechanically moving parts, such as a spring-biased slide to ensure the potential separation, so they remain due to the locally provided extinguishing agent LM still mobile.

The extinguishing medium LM enclosing volume may alternatively or additionally be released by a mechanical movement.

The extinguishing medium LM can be part of the moving part (see 1 and 2 ).

In the 3 and 4 can the separator A by suitable geometric design, a compression of the extinguishing medium LM at the location of the separation, whereby the extinguishing ability is improved.

Furthermore, the locally provided extinguishing medium LM by at least one enclosure (eg formed from Kapp K and intermediate layer Z ) and thus becomes after release of the extinguishing medium LM the volume kept substantially the same and thereby the compression of the extinguishing medium LM ensured at the location of separation, whereby the extinguishing ability is improved.

LIST OF REFERENCE NUMBERS

1

electric device

2

separating

LM

lure

TS

separation point

P

circuit board

LE1, LE2

Interconnect level

BF

attachment

K

cap

Z

interlayer

Claims (9)

Electrical device (1) with an integrated separation device (A), wherein in the region of the separation device (A) a powdery or granular extinguishing medium (LM) is arranged, wherein in the untripped state of the separation device (A) the extinguishing medium (LM) in a volume is spatially fixed, wherein in the triggered state of the separation device (A) the extinguishing medium (LM) penetrates into the separation point, wherein in the non-triggered state, the extinguishing medium (LM) is pressed and / or in a thermally degradable intermediate layer (Z) separated from the separation device (A) is held. Electric appliance after Claim 1 , characterized in that the extinguishing agent (LM) comprises sand and / or polyoxymethylene. Electric appliance after Claim 1 or 2 , characterized in that the thermally degradable intermediate layer (Z) comprises a film and / or paper. Electrical device according to one of the preceding claims, characterized in that the extinguishing medium (LM) is released by thermal action and / or mechanical action. Electrical device according to one of the preceding claims, characterized in that the integrated separating device (A) is arranged on a circuit board (P). Electrical device according to one of the preceding Claims 1 to 4 , characterized in that the integrated separating device (A) is arranged on a circuit board (P) and the separating device (A) is designed as a through-connection of two printed circuit traces (LE1, LE2). Electrical device according to one of the preceding claims, characterized in that the device has an overvoltage protection device. Electric appliance after Claim 7 , characterized in that the overvoltage protection device is selected from a group comprising varistor, spark gap, gas arrester, transient voltage suppressor diode. Electrical device according to one of the preceding Claims 7 or 8th , characterized in that the electrical device (1) is an overvoltage protection device.

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