DE102006042028B3 - Separation device for pluggable surge arrester, has metallic form part and finger standing under self-spring stress, where finger is supported at guide and is engaged into space closed by u-shaped end of metallic form part - Google Patents

Abstract

The device has an outer connection contact (6) formed as a metallic form part comprising an integral extension side piece (7), where an u-shaped end (9) of the side piece points to a solder joint. A connection point of an arrester element is formed as a planar part (10), which is secured with a section of the u-shaped end by a solder. The metallic form part and a finger stand under self-spring stress, where the finger is supported at a guide and is engaged into the space closed by the u-shaped end of the form part.

Description

The Invention relates to a separating device for in particular pluggable surge arresters, wherein the separation point as a thermally triggered solder connection between an external terminal contact of the arrester and a connection point the at least one arrester element, for example a varistor disk accomplished and wherein further on the solder joint, a biasing force acting in the direction of separation, according to the preamble of claim 1

Surge arresters with separation points, which are designed as thermally influenced solder joint belong, for example, according to the DE 295 19 313 U1 to the state of the art.

Under the influence of a Warming, their heat source preferably a surge protection component to be monitored, e.g. forms a varistor, the solder is liquefied and as a result of a triggered switching movement a specially provided part of the separating device an electrical connection separated.

The Part of the separating device which performs the switching movement is according to the prior art by means of a spring force aligned in the switching direction biased. The switching movement reaches its absolute endpoint, as soon as the preloading force of the spring is used up.

The EP 0 716 493 A1 discloses a parallel connection of a plurality of varistors each having a disconnecting device, wherein the state of each of the varistors can be displayed by means of a display device. In this solution of the prior art, a plurality of solder joints are to be separated as simultaneously as possible in order to cancel the electrical connection. Of course, several solder joints require a larger amount of solder material, with the result that the heat energy has a greater value to reach the melting point of this larger amount of material. As a result, a delayed response of the separating device is possible.

According to the DE 40 42 237 A1 It is also known to provide a package of varistors connected in parallel, which communicate with the respective terminals via copper strands. The copper strands are held under spring tension and have solder joints, so that even in this prior art, a separation device is given.

The However, use of copper strands is disadvantageous in that that by the current force effects a splicing of the strand occurs with the consequence that the overvoltage protection device fails can.

Out The above, it is therefore an object of the invention, a further developed Separator for especially pluggable surge arresters specify, where the separation point as a thermally triggered solder joint between an external terminal contact of the arrester and a connection point the at least one arrester element, for example a varistor disk accomplished is and where a safe, fast disconnection can be realized can and continues to provide increased thermal sensitivity for a safe Trigger the arrester in the fault or overload case given is.

The solution The object of the invention is achieved by a separation device especially for pluggable surge arresters according to the combination of features according to claim 1, wherein the dependent claims at least expedient embodiments and represent further education.

The Separating device according to the invention can also for the parallel connection of several arresters, i. protection elements be carried out as a common separating device, the quasi in force-free Space between the arresters is arranged. As a result, the separating device loaded with very high surge currents become and by the close contact with the arresters results the wished sensitive response.

According to the invention, the outer terminal contact in particular pluggable surge arrester designed as a metallic molding, which having an integral extension leg.

This extension leg includes a solder joint, i. leading to the separation point End up, which has a U-shape.

Of the connection point of the arrester element, e.g. a varistor disk, is designed as a surface piece, which, in abutment with a section of the U-shaped End of the molding standing, with this secured by the solder is.

Farther according to the invention is the metallic Molded part under natural spring bias, wherein the biasing direction coincides with the separation movement.

In the space enclosed and formed by the U-shape of the molding portion engages a spring-loaded finger mounted in a guide to cause rapid and secure electrical separation of the solder joint upon release by both assisting the separation movement of the molding and displacing to effect the soldering material.

The Width and length the finger is executed in this way that yourself a shovel-like pulling and pushing away of the molten solder in the Separation case results. unwanted Lotspratzer or solder bridges are avoided by this constructive solution.

at an alternative embodiment may be the solder joint as a pin or rivet from a melting Material executed be, with the pin and the rivet both a recess in the sheet piece as well in the U-shaped Penetrates the end of the molding. You can virtually use this function rewrite a cotter pin made of a melting material exists, i. acts as a connecting solder.

Of course you can too a plurality of spaced pins or rivets of a melting material accomplished if this proves necessary taking into account the surge currents to be

at a preferred embodiment extends the respective surface piece of the arrester element parallel to the respective leg of the U-shaped end of the molding and is attached to this.

In In one embodiment, the finger acts on the connecting portion between the U-shaped leg of the molding and pulls this section by spring force in the separation direction with, wherein the spring biasing force of the molding vectorially added to that spring force on the finger, realized, for example, by a helical compression spring acts.

The Soldering is possible as the only solder joint especially in the form of a solder pill, i. they are not several solder connections required, as is necessary in the prior art.

Of the Finger can be used with an optical display to show the functional state of the arrester. This visual display can be Include sliding element with correspondingly colored design, which moves in front of a window or removes it from a window area becomes.

at a further preferred embodiment are two disc-shaped Ableiterelemente arranged parallel and spaced from each other, wherein the respective patches on each other facing sides facing such that a U-legs of the molding with a first surface piece and the other U-legs with a second surface piece to the plant comes, with the separation direction and the separation movement in the distance space the arrester elements are predefined or run.

The Metallic molded part may be facing away from the solder joint at its End a V-shaped Have Steckkontaktabwinklung.

at an embodiment, the sheet piece a Bend, e.g. accomplished at an angle of 90 °, having the connecting portion between the legs of the U-shaped End of the molding outside, i.e. at least on a side remote from the separating direction partially surrounds. Also in this constructive variant is the Distance of mechanical contact between sheet and molding at least one Secured section by a solder material.

to increase stability can the extension leg of the metallic molding at least one-sided or also have a two-sided fold. This fold can until the U-shaped Guided the end of the molding be or over an extension go over the bent leg in the U-shaped end.

As already stated, the disconnecting device and the terminal of the surge arrester from a single part, preferably consisting of a metallic, resilient material, executed, which bent into a U-shape and with the respective patch or several pieces of surface at the parallel connection of arresters is soldered. It supports it the spring action of the material of the molding the desired separation movement especially even if several parallel connected Discharge an uneven heating of the Lotverbindung occurs.

The Invention will be described below with reference to exemplary embodiments and under With the help of figures closer explained become.

in this connection demonstrate:

1 a perspective view of a module for a pluggable surge arrester with disconnecting device and removed outer housing;

2 an analogous representation of those after 1 but in side view;

3 a representation of the surge arrester according to those after 2 but with the support plate removed;

4 and 5 Representations of the surge arrester in the separated state;

6 and 7 Top view and perspective view of a first embodiment of the embodiment of the separation device in the use of two parallel disc-shaped conductors, in particular varistors;

8th a second embodiment of the separating device with a rivet or a pin made of a melting material;

9 a representation of the single solder joint executed as Lotpille;

10 a third embodiment of the separating device, wherein the surface pieces of the arrester have an angled portion and engage around the metallic molded part on the outside;

11 a representation of an embodiment similar to that after 9 but with only one varistor;

12 a representation of those similar 8th , but only with one arrester and

13 an illustration of the separation device according to 11 with finger and optical display for signaling the functional state of the separating device or of the arrester used.

In the illustrations according to figures, it is assumed that a disconnecting device for in particular pluggable surge arrester, which as a plug-in module 1 , comprising one or more arresters, for example in the form of varistors, can be performed.

This example in 1 plug-in module shown 1 has a mechanical support part 2 which is used for fastening and holding varistor disks 3 (please refer 6 ) serves.

A support plate 4 serves, inter alia, the inclusion of a display device 5 , which can be realized as a slide, for example.

By a change in position of the display device 5 can be a colored box on the support plate 4 is present, based on a window contained in the outer housing (not shown) to be opened or closed.

The plug-in module 1 also has external connection contacts 6 on, which are used for electrical contacting in conjunction with a mating contact piece of a base part (not shown).

The authoritative for the separation device according to the invention terminal contact 6 (in 1 recognizable in the right part of the picture) is formed as a metallic molded part, which has an integral extension leg 7 having. Under this integral embodiment is understood that the respective terminal contact with the extension leg 7 is made in one piece.

The solder connection 8th (please refer 9 ) facing end of the extension leg 7 has a U-shape 9 ,

The connection point of the arrester element, eg a varistor disk 3 , is as a patch 10 formed, which, in abutment with a portion of the U-shaped end 9 standing of the molding, with this by the solder joint 8th is secured.

The metallic molded part, ie the extension leg 7 , is under a natural spring bias.

In the of the U-shape 9 The space enclosed and formed by the molding section is a spring-loaded finger mounted in a guide 11 engaging in order to trigger a fast and safe electrical separation of the solder joint 8th to effect both by supporting the separation movement of the molding as well as by displacing the solder material.

Based on 3 is represented as the finger 11 about a leadership part 12 is movably mounted, wherein the guide part 12 a helical compression spring 13 receives.

The helical compression spring 13 ensures that the finger 11 under pretension in the image direction is left. This biasing direction thus has the same vector as that which by the inherent spring force of the extension leg 7 is characterized.

The 3 also makes it clear that the separating device according to the invention also with a further thermally triggered display 14 can be combined, for example, to signal the achievement of a first temperature limit, which does not yet lead to a relevant impairment of the solder joint 8th leads.

While the 3 the state of the in-service connection between terminal contact 6 and patches 10 represents is with the 4 and 5 the disconnected state made clear, it also being apparent that the display device 5 moved to the left in the picture.

During the separation process, the force of the helical compression spring acts 13 on the finger 11 and thus on the melting solder of the solder joint 8th one. The spring preload of the metallic molding also generates a force in the separation direction (arrow).

The detailed representation after 6 shows two spaced Varistorscheiben each with a surface piece 10 to the electrical connection.

The U-shaped end 9 of the metallic molded part comes with its outer sides of the U-legs with an outer side of the respective surface piece 10 in contact (see also perspective view after 7 ).

About recesses 15 or holes both in the respective surface piece 10 as well as in the corresponding leg of the U-shaped part 9 can according to the illustration 8th a pin or a rivet 16 be fixed from a melting material, which secures the separation point until reaching the melting point of the rivet or pin material.

As shown 9 can also be a solder joint 8th be realized as a lotus. Of course, a combination rivet / pin 16 and solder connection 8th feasible as Lotpille.

According to the third embodiment 10 has the extension leg 7 a shape, according to which two bends are oriented in the direction of the space, which of the two spaced Varistorscheiben 3 is formed.

In this case, the patches own 10 one fold each 17 that the extension leg 7 on the outside, ie, surround the side facing away from the separation direction.

Also in this embodiment, a solder joint secures the position of the extension leg 7 regarding the location of the with a fold 17 provided patches 10 ,

The representations after the 11 and 12 show a variant of the separating device in each case partially completed, but still without display device 5 and the guided finger 11 , The latter elements are shown in the illustration 13 recognizable.

Here is also apparent how the finger 11 at least partially in the solder connection 8th dips, so that when melting the solder by the finger 11 entrainment and moving away of the solder material can take place from the separation point.

The metallic molding with the extension leg 7 preferably has stability-increasing contours 18 , which are executable as a bead or angling.

In addition, the metallic molded part has at its from the solder joint 8th pointing away end on a V-shaped Steckkontaktabwinklung.

1

plug-in module

2

mechanical supporting part

3

varistor

4

support plate

5

display device

6

connection contact

7

extension leg

8th

solder

9

U-shape

10

patch

11

finger

12

guide part

13

Helical compression spring

14

thermal releasable more ad

15

recess

16

Rivet / pin

17

fold

18

contour

19

Steckkontaktabwinklung

Claims (11)

Separating device for in particular pluggable surge arrester, wherein the separation point is designed as a thermally triggered solder connection between an outer terminal contact of the arrester and a connection point of the at least one arrester element, for example a varistor disc and wherein furthermore acts on the solder connection a biasing force in the separation direction, characterized in that - at least an external connection contact ( 6 ) is designed as a metallic molded part, which has an integral extension leg ( 7 ), whose solder connection ( 8th ) pointing end a U-shape ( 9 ), - the connection point of the arrester element ( 3 ) as area piece ( 10 ), which, in abutment with a portion of the U-shaped end ( 9 ) of the molded part standing, with this secured by a solder, - the metallic molded part is under natural spring bias, and in the of the U-shape ( 9 ) of the molding portion enclosed and formed space on a guide ( 12 ) mounted, under spring biasing fingers ( 11 ) engages in order to trigger a fast, safe electrical disconnection of the solder connection ( 8th ) to effect both by supporting the separation movement of the molding and displacing the solder material. Separating device according to Claim 1, characterized in that the solder connection is in the form of a pin or rivet ( 16 ) made of a melting material leads, with the pin or rivet ( 16 ) both a recess ( 15 ) in the patch ( 10 ) as well as in the U-shaped end ( 9 ) penetrates the molding. Separating device according to claim 1 or 2, characterized in that the respective surface piece ( 10 ) of the arrester element ( 3 ) parallel to the respective leg of the U-shaped end ( 9 ) of the molding runs adjacent to this. Separating device according to one of the preceding claims, characterized in that the finger ( 11 ) acts on the connecting portion between the U-legs of the molded part. Separating device according to claim 1, characterized in that the solder connection ( 8th ) is executed as a single lotus pill. Separating device according to one of the preceding claims, characterized in that the finger ( 11 ) with an optical display ( 5 ) for displaying the functional state of the arrester ( 3 ). Separating device according to one of the preceding claims, characterized in that two disk-shaped arrester elements ( 3 ) are arranged parallel and spaced from each other, wherein the respective surface pieces ( 10 ) on mutually facing sides in the shock current side force-free space are opposite such that a U-leg of the molded part with a first surface piece and the other U-legs comes to rest with a second surface piece, wherein the separating direction and the separation movement in the distance space of the arrester elements ( 3 ) are predefined or run. Separating device according to one of the preceding claims, characterized in that the metallic molded part at its from the solder connection ( 8th ) end pointing away a V-shaped Steckkontaktabwinklung ( 19 ) having. Separating device according to claim 1, characterized in that the surface piece ( 10 ) one bend each ( 17 ) having the connecting portion between the legs of the U-shaped end ( 9 ) of the molded part on the outside, ie at least partially surrounds the side facing away from the separating direction. Separating device according to claim 1, characterized in that the extension leg ( 7 ) of the metallic molding at least one contour ( 18 ) having. Separating device according to claim 10, characterized in that the contour as a fold to the U-shaped end ( 9 ) of the molded part is guided.