EP1513180A1 - Low voltage high power electric fuse link with movable indicating element - Google Patents

Abstract

A housing contains a working fusible conductor connected to contact blades (3). A fusible indicator conductor (24) is directly fixed in one blade holding plate (10) by a clamp connection. The blade holding plate has a projection, and the fusible indicator conductor is clamped between the projection and the remaining section (27) of the blade holding plate. An independent claim is included for a further fuse link.

Description

The invention relates to a fuse link, in particular for low-voltage high-performance fuses (NH fuses), with one on opposite Sides open housing, cover plates connected to the housing for closing the openings of the housing, one in the region of the inside the respective cover plate arranged knife holding plate for storage a contact blade, which has an opening in the cover plate to the outside penetrated, wherein in the housing a working fusible conductor is arranged, the conductive connected to the contact blades, and with a display device, which has a display element in the area of the outer surface of a cover plate, wherein the display element of a arranged in the housing, electrically arranged parallel to the working molten conductor, wire-shaped display melting conductor is fixed in a prestressed position, the display melting conductor with a End attacks on the display element and the other end by means of a Clamping connection is fixed in the region of a knife-holding plate.

Fuse-links for NH fuses are diverse in the prior art known.

As the present invention as the closest prior art will DE-A 100 05 145. For this is a fuse of the beginning known type. He points out electrically insulating material existing cover plates on. The respective contact blade is provided with lugs, enforce the openings in the associated cover plate and with the this cover plate facing knife holding plate are connected. Each knife holder plate is provided with a through hole into which a sealing plug is plugged in. The one sealing plug, in the area of a knife holder plate which is associated with the display element is with a central Hole provided through which the indicator melting conductor is inserted. That after The outside projecting end of the indicator melt conductor is in a slot of the Display element inserted and thus clamped to this. The other The end of the indicator fusion conductor is, before the pressing in of the sealing plug into the hole of the knife holder plate, through this, the filling opening for Extinguishing sand performing opening pulled through and by means of a fastener fixed. Subsequently, the receiving space of the housing filled with extinguishing sand. Then the filling opening by means of the sealing plug locked. The indicator fusible conductor is thus between the sealing plug and the knife holder plate clamped.

In this known from the prior art fuse link is the respective blade holding plate in the region of the opening, the recording of the sealing plug serves, with an outward, thus away from the housing Provided annular flange. This extends from the main surface of each Blade holding plate. The outwardly directed flange provides a conductive Connection of the respective blade holder plate to the indicator fusion conductor or the display element safely. This is under the aspect of non-conductive Cover plates of importance.

The disadvantage of this fuse link that its design in the field both knife holding plates and the local contact areas of the display device structurally quite complex and also a large installation effort conditionally. Thus, the sealing plug is used in the region of the display element not only the attachment of the display element, but also its Contacting with the associated knife holder plate. In this area is Moreover, the display melting conductor to guide through the blade holder plate, specifically to thread through the hole in the sealing plug, which is in the opening of the Knife plate is inserted. This procedure is extremely expensive. The other end of the display melt conductor is first, before pressing of the sealing plug to fix by means of a fastening element. First after filling the housing with extinguishing sand, the stopper can in the opening of the associated blade holder plate and the associated Cover plate to be inserted; only with inserted plug the display fusion conductor is fixed there. For fixing is thus at least the Sealing plug required, also for pre-fixing the fastener. This procedure is very complicated, so the structural complexity for the automated production of such fuse inserts considerably is.

In DE-A-197 44 535 a fuse link for NH fuses is described, in which the indicator fusible conductor in the region of a cover plate an intermediate plate, for example by a spot weld, fixed and to which, arranged on this base plate contact blade is connected. In an opening of the other cover plate an insulating bush is inserted through which is passed through the display melting conductor. The opening opens into a Recess of this cover plate. A display element of a display device is inserted with a base leg in this recess and there through Squeezing the lateral edge of the recess fixed. A thigh of the Display element is provided with a breakthrough or slot through which the indicator fusion conductor, which is formed as a thin wire passed is. The indicator fuselage is on top of this leg with this spot-welded. The cover plate can also in this fuse be non-conductive. In this case, it is proposed the display element provided with a shaped nose or rounding, which directly the contacted the display element associated contact plate when the display melting conductor is curious.

The object of the invention is a fuse link of the aforementioned Refine the type so that with minimal manufacturing and assembly costs a secure and permanent electrical contacting of the display device is guaranteed.

The problem is solved in a fuse link of the aforementioned Type in that the display fusion conductor by means of the clamping connection directly is set in a knife holder plate.

According to the invention it is thus provided that the knife holder plate itself the Setting a display fuse is used. It is therefore no further component necessary for setting the display melt conductor on the knife holder plate, thus, in particular, no sealing plug, which is the clamping connection between this and the blade holder plate causes. It is not Provide welded joint, the connection between display melt time and blade holder plate. The connection of the indicator fusion conductor by means of a sealing plug has the disadvantage that the pressing-in direction the plug opposite to the pulling direction of the display melt conductor and therefore an inspection is required if the display element is really curious. This also applies to a welded joint of the indicator fusion conductor. Apart from that, there is a risk that at excessive heating of the indicator melting conductor, when attaching to the associated blade holder plate, the indicator fuse in this area is accidentally severed.

The invention proceeds in a very simple way, in which the determination of the Induction melting conductor takes place directly in the knife holder plate. Especially This type of connection between the knife holder plate and the indicator fusion conductor is easy accomplish if the knife holder plate a projection wherein the display fusion conductor between the projection and the remaining portion of the blade holder plate is clamped. in principle is sufficient such a clamp connection, as by a tapered Gap between knife plate and projection can be achieved. So the attracted indicator fusion conductor is moved into this gap and is held permanently in this position.

It is regarded as more advantageous when the connection of indicator melting conductor and knife holder plate is insoluble. This is preferably done by that the clamping connection by deforming the projection in the direction of remaining portion of the blade holder plate is formed. A deformation process the knife-holding plate thus leads to the permanent connection of display melting conductor and knife holding plate.

The knife holder plate can be designed as a very simple component. That's the way it is to achieve the purpose of the invention possible, the knife plate overall form as a flat component. The projection sticks out in this case slightly away from the remaining portion of the knife holder plate. in principle but it would also be conceivable, the projection of the main plane of the blade plate to orient out. In the former case, the indicator fusion conductor becomes in the region of the front edge of the knife holder plate, in the second-mentioned Fall in the area of the main surface of the knife plate between this and held the possibly deformed projection.

From the aspect of a particularly simple generation of the clamp connection between display fusion conductor and knife holder plate, it is advantageous viewed when the clamping connection of the adjacent cover plate, in the Escape of the clamping connection, provided with a through hole, which means a plug is closed. In this design is at largely assembled fuse-link, before filling with extinguishing sand, the indicator melting conductor, which is fastened with its other end to the display element, stuck through the hole in the cover sheet and between the projection and the knife holding plate positioned. When clamped by means of a tool Display fusion conductor can then through the through hole by means of a another tool to be acted on the projection, such that the Pressed projection against the remaining portion of the blade holder plate and in this case the indicator fusion between him and the remaining Section of the knife holder plate jams. After filling the housing With deletion sand, a sealing plug can be inserted into this through hole become. The function of the sealing plug is thus independent of the fixing of the display melting conductor in the area of the knife holding plate.

The above solution and its developments thus relate to the safe and permanent electrical contacting of the display device in Area of the one end of the display device. The following explained second solution and its refinements refers to the safe and permanent electrical contacting of the display device in the region of other end of the fuse link.

The problem is in a fuse link of the type mentioned in accordance with solved second solution by the fact that the display element adjacent Knife holding plate one out of the main surface bent out Messerhalteplattenabschnitt or an expression of this main surface, wherein the blade holding plate portion or the stamping a through hole in the plate plate facing this facing plate passes through and in biased position fixed display element contacted directly electrically, wherein the display fusible conductor adjacent to the bent-out blade holding plate portion or the expression is arranged.

In this solution, the bent-out blade holder plate section comes or the expression of the knife holder plate only the contact function to. This area is therefore not functionally related to the Feed the indicator melt conductor through the knife holder plate in the area a hole that can be closed by means of a plug, as in DE-A 100 05 145 is described. There is the knife holder plate with a ring section provided which is inserted in a hole of the associated cover plate, wherein the outer end-side edge of the ring portion at most with the outer Face of the respective cover plate is aligned. The ring section interspersed the indicator fusion conductor inserted through a hole in a sealing plug is. By means of this sealing plug, the display element on the Knife plate secured by passing through a hole in the display element Plug into the hole of the knife plate in the area of the Ring section is pressed. In contrast, in the solution according to the invention the indicator fusion conductor is located next to the bent-out blade holding plate portion or the expression of the main surface of the knife plate arranged. A plug to close an opening in the area this cover plate or knife holder plate is not required. This is simplified the manufacture and installation of the fuse link considerably.

According to a preferred embodiment, it is provided that the display melting conductor outside of the display element adjacent knife holder plate is arranged. In this design comes the bent out Knife holding plate section or the expression of the knife holder plate the Contact function regarding the indicator to, while the indicator fusion conductor, which acts on the display element, based on the range of Knife holding plate, is arranged outside this knife holder plate.

The indicator fusible conductor will thus not pass through a hole in this knife holder plate passed, but past the knife plate. The manufacturing and mounting the fuse link in this area is simplified, because the assembling operations of this knife holding plate and the display melting conductor can be done separately. It is not necessary to use the indicator melting conductor through a hole in a stopper that fits into the knife holder plate is inserted, durchzufädeln. Instead, the through hole must be in the the knife plate facing cover plate only according to the dimensions the bent-out blade holding plate section or the expression the knife holder plate be designed.

The variant of the knife holder plate with the bent-out blade holder plate section is of particular advantage. Since only a relatively small embossing height can be achieved by means of an expression, the bending out of a section, depending on the bent-out length, allows the use of the knife holding plate for cover plates of different and in particular relatively large wall thickness. In case of identical arrangement of the through-hole, only the protruding portion of the blade holding plate is more or less shortened and bent out at the same position according to the thickness of the cover plate, whereby the respective blade holding plate portion has the desired different length corresponding to the thickness of the cover plate. A particularly simple design of such a knife-holding plate is characterized by a knife-holding plate section bent at right angles to the main surface of the knife-holding plate.
Such a knife-holding plate having an outwardly bent portion can be easily formed from a flat starting plate.

According to a preferred embodiment of the invention according to the two aforementioned solutions is provided that the respective cover plate is not conductive is. It thus has in particular voltage-insulated grip bottles. The Contacting of the display device thus takes place both in the region of the display element and the display fusion conductor directly to the blade holding plates back and from there to the contact blades. Switches the fuse As a result, a secure melting of the display melt conductor is guaranteed. Advantageously, the display element extends in the fuse link from the area of the outer surface of the associated cover plate to Lateral surface of the fuse link. It is thus in the fuse such as with front and center detector, as he, for example from DE-A-100 05 145 and DE-A-197 44 535 is known. Preferably However, if the display element is loose on the cover plate, it is thus not connected to the cover plate. Such a variant is basically in the DE-C-1 034 751.

Further features of the invention are in the subclaims, the description the figures and the figures themselves, it being noted that all individual features and combinations of individual features essential to the invention are.

Figur 1

ein Längsmittelschnitt durch eine erste Ausführungsform des erfindungsgemäßen NH-Sicherungseinsatzes, ohne Gehäuse, bei gespanntem Anzeigeelement,

Figur 2

einen Schnitt gemäß Figur 1 durch den NH-Sicherungseinsatz, bei ausgelöstem Sicherungseinsatz, somit bei durchtrenntem Anzeigeschmelzleiter und entspanntem Anzeigeelement,

Figur 3

eine Ansicht III der einen Messerhalteplatte gemäß Figur 2, veranschaulicht vor dem Umformen dieser Messerhalteplatte zwecks Klemmen des Anzeigeschmelzleiters,

Figur 4

die in Figur 3 gezeigte Messerhalteplatte nach deren Umformung und somit Klemmung des Anzeigeschmelzleiters,

Figur 5

eine räumliche Ansicht der anderen Messerhalteplatte des NH-Sicherungseinsatzes,

Figur 6

für eine zweite Ausführungsform der Erfindung Teile des NH-Sicherungseinsatzes in einer räumlichen Ansicht, nämlich im Wesentlichen die eine Deckplatte mit Kontaktmesser und Anzeigeelement sowie die andere Deckplatte mit Messerhalteplatte und zwischen diesen angeordneter Dichtscheibe,

Figur 7

eine räumliche Ansicht der nur bezüglich der Deckplatte zur Aufnahme des Anzeigeelementes, des Gehäuses und des zwischen Deckplatte und Gehäuse angeordneten Dichtscheibe dargestellten NH-Sicherungseinsatzes,

Figur 8

für diese Ausführungsform in einer räumlichen Ansicht eines Mittellängsschnittes das Gehäuse, die Deckplatte, das Anzeigeelement und die Messerhalteplatte und

Figur 9

eine Explosionsdarstellung von Messerhalteplatte, Dichtscheibe und Deckplatte für den in Figur 8 veranschaulichten Bereich des NH-Sicherungseinsatzes.

In the figures, the invention is illustrated by means of an embodiment, without being limited thereto. It shows:

FIG. 1

a longitudinal center section through a first embodiment of the invention NH fuse-link, without housing, with a tensioned display element,

FIG. 2

a section according to Figure 1 by the NH fuse-link, with triggered fuse link, thus with severed display melting conductor and relaxed display element,

FIG. 3

FIG. 2 shows a view III of a knife-holding plate according to FIG. 2, before forming this knife-holding plate in order to clamp the indicator melting conductor,

FIG. 4

the knife holding plate shown in Figure 3 after the forming and thus clamping of the display melting conductor,

FIG. 5

a spatial view of the other knife holder plate of the NH fuse-link,

FIG. 6

for a second embodiment of the invention, parts of the NH fuse-link in a three-dimensional view, namely essentially the one cover plate with contact blade and display element and the other cover plate with knife-holding plate and arranged between these sealing disc,

FIG. 7

a spatial view of the only with respect to the cover plate for receiving the display element, the housing and arranged between the cover plate and housing sealing washer shown NH fuse-link,

FIG. 8

for this embodiment, in a three-dimensional view of a central longitudinal section of the housing, the cover plate, the display element and the blade holding plate and

FIG. 9

an exploded view of knife holder plate, sealing washer and cover plate for the illustrated in Figure 8 range of NH fuse-link.

The embodiment of Figures 1 to 5 differs from those according to FIGS. 6 to 9 essentially in that the indicator melting conductor in the embodiment of Figures 1 to 5 through a hole the knife-holding plate adjacent to the display element is guided. at The embodiment according to FIGS. 6 and 9 is the indicator melting conductor arranged outside this knife plate.

In the following description, first of all, the embodiment the figures 1 to 5 reference:

On the side of the display element, the NH fuse-link has a Knife plate 1, with two in cross-section substantially rectangular Openings 2 for receiving pin 3 of a contact blade 4 provided is. Adjacent to the knife holder plate 1 is made of insulating material Cover plate 5 is arranged, which receives a metallic gripping tab 6 above, which is thus formed as an insulated grip tab. Between the cover plate 5 and the knife holder plate 1 is a non-conductive material formed gasket 7, the cover plate 5 is fixed by means of four screws on formed as a ceramic body hollow cylindrical housing, as is the case second embodiment in Figures 7 and 8 with the reference numeral 9 illustrated is.

On the other hand, the NH fuse-link accordingly has a knife-holding plate 10 with openings 2, a contact blade 4 with pin 3, a Cover plate 11 with handle tabs 6, a sealing washer 7 and 8 screws to Connecting the cover plate 11 with the housing 9. The knife holder plate 10 and the cover plate 11 are therefore designated differently than the Knife plate 1 and the cover plate 5, because these components, depending on the side of the NH fuse-link, designed differently in this embodiment are.

For connecting the respective contact blade 4 with the knife-holding plate 1 or 10, the free ends of the in the openings 2 of the blade holder plate 1 or 10 inserted pin 3 caulked. The actual contact blade 4 passes through an opening adapted to the cross section of the contact blade Sealing disk 7 and the cover plate 5 and 11. Held the respective knife holder plate 1 and 10, by 5 or 11 when attaching the cover plate on the housing 9 by means of screws 8 between the cover plate 5 and 11 and a return of the housing is clamped.

As can be seen from the illustration of FIG. 5, the knife holder plate 1 a knife holder plate portion bent out of the main portion 12 thereof 13 on. This is arranged approximately at right angles to the main section 12. The deflection is in the region of the knife-holding plate 1, which is adjacent to the pull tab 6. Adjacent to the knife holding plate section 13, the main portion 12 is provided with a through hole 14.

Between the pull tab 6 and the contact blade 4, the cover plate with a Return 15 provided. The length of the knife holding plate section is so dimensioned that its free end face 16 on the cover plate 2 in the area the recess 15 of this cover plate protrudes. This makes it possible that the blade holder plate 1 in the region of the end face 16 a flat as a Z-shaped Spring trained display element 17 of a display device 18th contacted. The display element 17 is characterized by the leg forming a spring 19, 20 and 21 formed. The leg 19 is exposed to the end face 16 of Knife plate 1 at. The display element 17 is made from the Leg 21 in another leg 22 away. The visible leg 21 includes the function of the face detector of the NH fuse-link, the of the side visible leg 22 the function of the center detector. In that sense the leg 22, which is provided with a marker, in a known manner and Way with a hole 23 in the housing 9, as for example to FIG concerning the further embodiment is illustrated.

Component of the display device 18 also forms a trained as a wire Indicator fusion conductor 24. This is electrically parallel to an unspecified, From the prior art well-known work ladder arranged. This working conductor is through the housing. 9 guided and connected to the pin 3 of the contact blade 4.

The indicator fusible conductor is at one end to the display element 17 in Area of transition of the legs 21 and 20 connected. So does the Leg 21, for example, a slot into which the display fuse 24th is clamped, preferably after repeated wrapping of the display element 17 in the area of the leg 21. In the area of the other cover plate 11, the display fuse 24 is directly in the knife holder plate 10 held. This differs from the blade holder plate 1 in that they do not have a knife holding plate portion bent out of the main portion 12 13 and also has no hole 14. Rather, the knife holder plate 10 adjacent the pull tab 6 a recess 25 on. Around lower limit of this return is the display fuse 24 by means of held a clamping connection in the blade holding plate 10. This is how the Knife plate 10 has a projection 26, wherein the display fuse between the projection 26 and the remaining portion 27 of the knife-holding plate 10 is clamped. FIG. 3 shows the state before jamming, wherein the between the projection 26 and the remaining portion 27th the knife-holding plate 10, a sufficiently large gap is formed to the display fuse 24 insert in this area of the blade holder plate 10, while Figure 4 shows the clamped state. In this is the projection 26th by deforming by means of a tool against the remaining portion 27 of the knife holder plate 10 has been moved. The deformation of the projection 26 takes place, as can be understood on the basis of the illustration in Figure 1, of outside the NH fuse-link by passing through an opening 28 in the Cover plate 11 and an aligned with this opening 29 in the sealing disc. 7 a tool in the region of the recess 25 of the knife-holding plate 10th is managed and takes effect there.

In the shown in the figure 1, biased by the display fuse 24 Position of the display element 17, the housing 9 with extinguishing sand filled and then the opening 28 in the cover plate 11 by means of a Closure plug closed.

FIG. 2 shows the state of the NH fuse-link, again shown without housing and in this extinguishing sand, after melting of the fuse link, thus after the melting of working smelting conductor and display fuse 24. The melting of the display semiconductor 24 causes the display element 17 relaxes and both its legs 21 and its legs 18 is moved with the consequence that the release of the fuse both frontally and from the Page can be detected.

In the illustrated in Figures 6 to 9 second embodiment of Invention are parts that match those of the first embodiment of the Figures 1 to 5 basically agree in structure and mode of operation, denoted by the same reference numerals.

In the embodiment of Figures 6 to 9, the knife-holding plate 1 no hole 14, but it is the blade holding plate portion 13 is denser with respect to a facing this opening 2 of the blade holder plate 1 is positioned and the indicator fusible conductor 18 passes outside of the blade holder plate 1 and connected to the display element 17 in the region of the leg 21. The corresponding opening in the cover plate 5 for performing the Messerhalteplattenabschnittes 13 is in Figure 7 with the reference numeral 30, the small, Hole-like opening for the passage of the wire-shaped display melting conductor 24 is designated by the reference numeral 31 in this figure. For the purpose of better understanding are in the figures 6 to 9 only for the respective Explanation of the Figure essential components illustrated.

Claims (13)

Fuse insert, in particular for low-voltage high-performance fuses (NH fuses), having a housing (9) which is open on opposite sides, cover plates (5, 11) connected to the housing (9) for closing the openings of the housing (9) in the region of the inside of the respective cover plate (5, 11) arranged knife holding plate (1, 10) for supporting a contact blade (4) which passes through an opening in the cover plate (5, 11), wherein in the housing (9) a working melt conductor is arranged , which is conductively connected to the contact blades (4), and with a display device (18) having a display element (17) in the region of the outer surface of a cover plate (5), wherein the display element of a arranged in the housing, electrically parallel to the working fuse arranged wire-shaped display melting conductor (24) is fixed in a prestressed position, the display melting conductor (24) with one end on the display element (17) engages and the other End, by means of a clamping connection, in the region of a knife-holding plate (10) is fixed, characterized in that the display melting conductor (24) by means of the clamping connection is fixed directly in the one blade holding plate (10). A fuse link according to claim 1, characterized in that the blade holding plate (10) has a projection (26), wherein the indicator fuse (24) between the projection (26) and the remaining portion (27) of the blade holding plate (10) is clamped. Fuse-link according to claim 1 or 2, characterized in that the clamping connection is formed by a notch between the projection (26) and the remaining portion (27) of the knife-holding plate (10) and inserted into the notch display melting conductor (24). Fuse insert according to one of claims 1 to 3, characterized in that the clamping connection is formed by deforming the projection (26) in the direction of the remaining portion (27) of the knife-holding plate (10). Fuse insert according to one of claims 1 to 4, characterized in that the knife-holding plate (10) is formed at least in the region of the projection (26) and adjacent to this region of the remaining portion (27) of the knife-holding plate (10) as a flat component. Fuse insert according to one of claims 1 to 5, characterized in that the clamping connection of the adjacent cover plate (11) in the alignment of the clamping connection with a through hole (28) is provided, which is closable by means of a plug. Fuse insert, in particular for low-voltage high-performance fuses (NH fuses), having a housing (9) which is open on opposite sides, cover plates (5, 11) connected to the housing (9) for closing the openings of the housing (9) in the region of the inside of the respective cover plate (5, 11) arranged knife holding plate (1, 10) for supporting a contact blade (4) which passes through an opening in the cover plate (5, 11), wherein in the housing (9) a working melt conductor is arranged , which is conductively connected to the contact blades (4), and with a display device (18) having a display element (17) in the region of the outer surface of a cover plate (5), wherein the display element of a arranged in the housing, electrically parallel to the working fuse arranged wire-shaped display melting conductor (24) is fixed in a prestressed position, the display melting conductor (24) with one end on the display element (17) engages and the other End, by means of a clamping connection, in the region of a knife-holding plate (10) is fixed, characterized in that the display element (17) adjacent knife-holding plate (1) has a bent out of the main portion (12) blade holding plate portion (13) or an expression, wherein the knife-holding plate section (13) or the embodiment passes through a through-hole (30) in the cover plate (5) facing said knife-holding plate (1) and directly electrically contacts the display element (17) fixed in pretensioned position, wherein the display melting conductor (24) is adjacent to the knife-holding plate section ( 13) or the expression is arranged. Fuse insert according to claim 7, characterized in that the indicator melting conductor (24) outside of the display element (17) adjacent blade holding plate (10) is arranged. Fuse insert according to claim 7 or 8, characterized in that the blade holding plate portion (13) has a length which corresponds at least to the thickness of this facing cover plate (5) in its the blade holding plate portion (13) adjacent region. Fuse insert according to one of claims 7 to 9, characterized in that the knife-holding plate portion (13) is bent at right angles to the main portion (12) of the knife-holding plate (10). Fuse insert according to one of claims 1 to 10, characterized in that the respective cover plate (5, 11) is not conductive. Fuse insert according to one of claims 1 to 11, characterized indicates that the display element (17) extends from the region of the outer surface of the cover plate (5) to the lateral surface of the fuse link. Fuse insert according to one of claims 1 to 12, characterized in that the display element (17) rests loosely on the cover plate (5).

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