WO2018211058A1

WO2018211058A1 - Disconnection unit for a varistor

Info

Publication number: WO2018211058A1
Application number: PCT/EP2018/063055
Authority: WO
Inventors: Rainer Durth
Original assignee: Phoenix Contact Gmbh & Co.Kg
Priority date: 2017-05-19
Filing date: 2018-05-18
Publication date: 2018-11-22
Also published as: DE102017208571A1; CN110678941A

Abstract

The invention relates to a disconnection unit (AE) for a varistor (V), the varistor (V) having a first varistor contact (VK1) and a second varistor contact (VK2), the disconnection device (AE) providing a lid-like covering of the first varistor contact (VK1), wherein the lid-like covering has an opening (01) for making contact with the first varistor contact (VK1), wherein, in the mounted state, a force-loaded varistor terminal (VA1) is contacted by the first varistor contact (VK1) through the lid-like opening (O1) by means of a thermally softenable adhesive agent, wherein, in the event of thermal softening, the force-loaded varistor terminal (VA1) is moved away from the opening (O1), wherein the disconnection unit (AE) also has a force-loaded slider (S), wherein, in the event of the force-loaded varistor terminal (VA1) moving away, the force-loaded slider (S) closes the opening (O1) in the lid-like covering.

Description

Separating unit for a varistor

The invention relates to a separation unit for a varistor.

background

At present, a variety of varistors with separation units from different manufacturers are available in the market. It should be noted that different designs are offered for each application. On the one hand, these different embodiments require high development costs, on the other hand, high production costs are to be expected due to the comparatively small number of products in relation to the overall market. In addition, there is a need in a variety of applications to prevent possible arcing during separation. For this purpose, in the past, highly complex shields have been developed to extinguish an arc. This is e.g. at DC voltages advantageous, since otherwise due to the lack of zero crossing an arc can occur during separation, which can lead to fires and another current flow.

Against this background, the invention has set itself the task of providing a novel separation unit for a varistor which is universally installable. The object is achieved by a separation unit according to claim 1 or by a housing according to claim 5 or by a varistor contact according to claim 10 by a varistor terminal according to claim 14. Advantageous embodiments of the invention are specified in the subclaims, the description and the figures.

The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.

Show it

1 is a sectional view of embodiments of the invention, 2 is a side view of embodiments of the invention, FIG. 3 is a sectional view of embodiments of the invention, FIG. 4 is an aspect of embodiments of the invention shown in FIG. 3, FIG. 5 is an aspect of embodiments of the invention, FIG.

6 shows the aspect of the embodiments of the invention according to FIG. 5 in a different viewing direction, FIG.

7 is a detail of the aspect according to embodiments of the invention according to Figure 5 or 6 in a sectional view,

8 shows a further detail of the aspect according to embodiments of the invention according to FIG. 5 or 6 in a plan view,

9 shows a further aspect of embodiments according to the invention in a first viewing direction,

10 shows the further aspect of embodiments according to the invention in a second viewing direction,

11 shows a detail of the further aspect of embodiments according to the invention according to FIG. 9 or 10, and FIG

FIGS. 12-14 show different variants of a further detail of embodiments according to the invention according to FIG. 9 or 10 or 11.

Hereinafter, the invention will be illustrated in more detail with reference to the figure. It should be noted that different aspects are described, which can be used individually or in combination. That is, any aspect may be used with different embodiments of the invention unless explicitly illustrated as a pure 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 to be understood merely as an indication that at least one entity is used in a simple embodiment. FIGS. 1 and 3 show embodiments of the invention with reference to a separation unit AE for a varistor V.

The varistor V has a first varistor contact VK1 and a second varistor contact VK2, which are set up to connect the varistor V to a supply network. The separating device AE provides a cover-like covering of the first varistor contact VK1, wherein the cover-like cover has an opening Ol for contacting the first varistor contact VK1. In the mounted state, a (then) force-loaded varistor connection VA1 is contacted by means of a thermally softenable adhesive LI through the cover-like opening O1 to the first varistor contact VK1. In the case of thermal softening, the force-loaded varistor connection VA1 (under the influence of the application of force) is moved away from the opening Ol.

The separation unit AE furthermore has a force-loaded slide S, wherein the force-loaded slide S closes the opening O1 in the cover-like cover in the event of the force-moved varistor connection VAl moving away. Furthermore, Figures 1 and 3 and Figure 4 show a housing for a varistor V comprising a separation unit AE and another cover D. The further cover D provides a cover-like cover of the second varistor VK2 contact, wherein the cover-like cover has an opening 02 for Contacting the second varistor VK2 contact. In the mounted state, a (second) varistor connection VA2 is contacted by means of an adhesive L2 through the cover-like opening 02 to the second varistor contact VK2, wherein the separation unit AE and the further cover D engage in a form-fitting manner.

Furthermore, FIGS. 1 and 3 as well as FIGS. 5 to 8 show a varistor contact VK1, VK2 for application to a varistor V. The varistor contact VK1, VK2 has an electrically conductive material, wherein the varistor contact VK1, VK2 has a substantially planar contact a Varistoranschlussfläche a varistor V, wherein the varistor contact has a linear curvature W for contacting with a Varistoranschluss.

A linear curvature offers the advantage that only a very small area is provided for attacking an arc. In addition, potential arc base points are broadened to provide improved arc cooling. In addition, this makes it possible that the slide S of the separation unit AE gets a large Überfahrweg provided so that in the case of separation, an arc can be drawn in length, so that this leaves. On the other hand, the varistor contact to the varistor V represents a large contact area, so that a good thermal and electrical coupling is provided. Due to the good electrical coupling as even as possible loading of the varistor V allows while a thermal overload can be performed quickly from the varistor VKL, VK2 to the bulge W and thus to the separation point / adhesive LI, L2.

The contact with a varistor connection is preferably linear in order to provide a safe, yet variable connecting point which protrudes from an opening O1, O2 of a possible housing AE or D, respectively. The linear curvature W is in this case simple in terms of production, e.g. by bending (see, for example, Figure 7). The curvature can be arranged centrally (see, for example, FIGS. 6 and 8) or else outside the center. By rotating the varistor contact VK1, VK2, a different positioning on the varistor V can then be achieved, so that there is room for any configuration.

Furthermore, FIGS. 1 and 3 as well as FIGS. 9-14 show a varistor connection VA1, VA2 for contacting a varistor V in a housing. The varistor connection VA1 has at least one section AI for mounting in a housing part, wherein the varistor connection VA1 has a section for providing an electrical contact outside the housing, and wherein the varistor connection VA1, VA2 furthermore has a section A2 for contacting with a varistor contact VK1, VK2 has, wherein the varistor VAl, VA2 is integrally formed.

The varistor terminal may e.g. be formed as a stamped bent part of a metal strip. 9 shows a first side view, which is provided in its upper portion A2 for contacting with a varistor contact VK1, VK2, and which is provided in its lower portion AI for mounting in the housing. For this purpose, individual sections (for example the lateral sections repelling in Figure 9 and pointing forwards or backwards in Figure 10) may be provided with support structures (e.g., teeth) as shown in Figure 11. Also, the daggerboard area (below AI) may be suitably shaped, e.g. to meet different requirements. Thus, e.g. in addition to a more rectangular format (FIG. 12), it may also be provided that the dovetail area is designed to be more like a pyramid (stump) -like (FIG. 13) or even non-linearly tapering. Of course, some forms of mixing may be provided. As a result, e.g. Strength requirements and / or tolerance compensation are provided. Thus, e.g. the formations of Figure 12 and 13 a particularly simple insertion in the vertical direction with a horizontal self-centering.

The varistor connection can be used on both sides of the varistor. He can be both "strained" and "unstrained" attached. For example, the Varistor connection VAl in Figure 1 and Figure 3 braced (possibly also slightly twisted) attached to the contact (soldered). As a result, cushioning is provided by the varistor contact VK1 when softening. By rotation (see Figure 2) similar Varistoranschlüsse can be used and yet, for example, a desired high distance between the open contacts can be realized.

It should be noted that each one of the aforementioned units contributes. In this respect, it is not necessary for the realization of the objects of the invention to provide all the units according to the invention. Each individual has advantages that lead to a cost reduction. By means of the invention it becomes possible to provide a uniform concept for a multiplicity of different varistors and, thus, intended purposes.

In this case, the varistor V (having one or more series-connected varistor disks) can be contacted by means of uniform varistor connections VA1 and VA2. For this purpose, suitable varistor contacts VK1, VK2 can be mounted on the varistor V. The housing can be formed so that a large number of similar parts can be used for different embodiments of the varistor.

By minimizing different parts or restricting the different parts to a low level, it is possible to reduce manufacturing costs and development costs while ensuring safe separation of the varistor. In one embodiment, which is shown for example in FIG. 3, the cover has a projection I on the side of the first varistor contact VK1. By means of the projection I, e.g. can be designed circumferentially, the environment of the opening Ol (or 02) can be sealed, so that in case of Durchlegierens of the varistor V, the escape of components / gases / decomposition products through the opening Ol (or 02) is prevented. For this purpose, the separation unit (or the lid D) rests on the circumferential projection I. It should be noted that columns shown in the figures between housing parts AE and D are exaggerated in order to clearly separate the different parts drawing. For the productive use, the housing parts are preferably designed positively or gas-tight.

In one embodiment, which is shown for example in FIG. 3, the slider S under the action of force exerts a sliding and / or rotational movement parallel to the lid surface. As a result, particularly flat designs can be realized. In one embodiment of the invention, the lid comprises a material of an injection molding. As a result, housing parts can be produced in a particularly cost-effective manner.

In one embodiment of the housing, the separation unit AE and the further cover D latching elements -. a fine toothing - on, so that the separation unit and the other cover are connected in the assembled state. These locking means may e.g. be realized by a toothing and / or corresponding projections / recesses (in injection molding). Hereby, a secure recording of the varistor V can be provided with simultaneous ease of installation.

In a further embodiment, the latching elements are arranged so that a plurality of different thickness varistors V can be accommodated in the housing. For example, a plurality of toothings and / or corresponding projections / recesses may be provided on a housing part. If the other housing part is then applied, the corresponding latching means can be pushed over until a stop is reached (for example by contact with the projection I or the varistor V or the varistor contact VK1, VK2).

In one embodiment of the varistor contact, the linear curvature W is a pressed and / or folded seam. The linear curvature W can also be provided on a shorter section than the largest extension of the varistor contact, such as e.g. shown in the figure 6 and 8, respectively.

As already described above, the line-like curvature W can subdivide the connection surface into two symmetrical or two asymmetrical parts. In FIGS. 6 and 8, a subdivision into symmetrical connection surfaces with respect to the varistor is shown. In one embodiment of the invention, a section AI of the varistor terminal VA1, VA2 is designed for mounting in a housing part in such a way that, when mounted in the corresponding housing part, it makes subsequent removal difficult (FIG. 11). This provides a secure hold.

In particular, as shown in FIGS. 8 and 9, the varistor connection VA1, VA2 can provide a three-point support (for example by angled lugs) in the section AI relative to a housing part. The angled flags can, as shown in FIG. 11, have latching devices which catch there when pressed into a plastic housing part. Thus, the latched Varistoranschlüsse VA1, VA2 also record all the insertion and / or pulling forces from the Steckschwertern and other spring forces. Without loss of generality, the softenable adhesive LI may have a different melting point than the adhesive L2. Preferably, the adhesive LI is a low melting solder.

The varistor contacts VK1, VK2 are preferably fastened with a solder. Preferably, the melting point of the solder of the varistor contacts is higher than the melting point of the adhesive of the separable varistor terminal VA1.

Of course, of course, a varistor V already with a separation unit AE and / or a housing (comprising the separation unit AE and a lid D) and / or one or more varistor contacts VKL, VK2 and / or one or more varistor VA1, VA2 as an assembly to provide.

The invention thus enables a concept for contacting a varistor V by means of preferably stamped and bent parts (varistor connections, Varsitorkontakte), which can serve as Steckschwerter (eg lower portion of the Varistoranschlüsse VA1, VA2 in Figure 2) of an overvoltage protection connector and a simple and efficient separation system (separation unit AE ) form. In this case, as few (if possible) and preferably the same parts are used to achieve a cost reduction while at the same time providing functionality. The compensation for different varistor variants V, e.g. in a different thickness (width d of the varistor, see Figure 1) manifested, can also be done via varistor VA1, VA2.

The described housing and manufacturing concept allows a fully automated production. This is favored by the fact that only a few parts are needed.

For example, a complete varistor plug-in unit with integrated separation unit of a varistor V, two equal varistor contacts VKL, VK2, two varistor VA1, VA2, the separation unit AE with slide S and energy storage F and the lid D are provided. Without limiting the generality, alternatively or additionally, an adhesive may be provided which fixes the cover D or the separation unit AE on the varistor V or the varistor contacts VK1, VK2. This adhesive can also provide tightness against the varistor so that, if necessary, no plasma penetrates.

In one embodiment of the invention, an adhesive or a formabre mass is applied in a region around the openings Ol and 02, for example in the region of a projection I, or the projection I is formed by the adhesive / the moldable mass itself. In one embodiment of the invention may further be provided a hood H - see figure - which provides an insulatation to the environment, and which surrounds the inner part.

name list

AE separation unit

V varistor

VK1, VK2 varistor contact

Ol, 02 opening

LI, L2 adhesive

VA1, VA2 varistor connection

S slider

I lead

D cover

F energy storage

AI holding section

A2 contact section

D varistor thickness

W vaulting

H hood

Claims

claims

1. separation unit (AE) for a varistor (V), the varistor (V) having a first varistor contact (VKL) and a second varistor contact (VK2), wherein the separating device (AE) a cover-like cover of the first varistor (VKL) available wherein the cover-like cover has an opening (Ol) for contacting the first varistor contact (VKL), wherein in the mounted state, a force-loaded varistor (VA1) by means of a thermally softenable adhesive (LI) through the lid-like opening (Ol) with the first Varistor contact (VKL) is contacted, wherein in the case of thermal softening the force-loaded varistor (VA1) is moved away from the opening (Ol), wherein the separation unit (AE) further comprises a force-loaded slide (S), wherein the force-loaded slide (S) in the case of moving away the force-loaded varistor terminal (VA1) the opening (Ol) in the cover-like cover v opens.

2. separation unit (AE) according to claim 1, characterized in that the cover on the side of the first varistor contact (VKL) has a projection (I).

3. separation unit (AE) according to claim 1, characterized in that the projection (I) positively and gas-tight surrounds the varistor contact (VKL).

4. separation unit (AE) according to claim 1 or 2, characterized in that the projection I is formed of a moldable material or an adhesive.

5. separation unit (AE) according to any one of the preceding claims, characterized in that the slide (S) under the action of the force applying a sliding and / or rotational movement parallel to the lid surface.

6. separation unit (AE) according to one of the preceding claims, characterized in that the lid comprises a material of an injection molding.

7. housing for a varistor (V) comprising a separation unit (AE) according to one of the preceding claims and a further cover (D), wherein the further cover (D) provides a cover-like cover of the second varistor contact (VK2), wherein the lid-like cover has an opening (02) for contacting the second varistor contact (VK2), wherein in the mounted state, a varistor terminal (VA2) by means of an adhesive (L2) through the lid-like opening (02) through with the second Varistor contact (VK2) is contacted, wherein the separating unit (AE) and the further cover (D) engage in a form-fitting manner.

8. Housing for a varistor (V) according to claim 7, wherein the separation unit (AE) and the further cover (D) have latching elements, so that the separation unit and the further cover are connected in the mounted state.

9. housing for a varistor (V) according to claim 8, wherein the latching elements are arranged so that a plurality of different thickness varistors can be accommodated in the housing.

10. Varistor (V) comprising a separation unit according to one of claims 1 to 6.

11. Varistor (V) comprising a housing according to one of claims 7 to 9.

12. Varistor contact (VK1, VK2) for application to a varistor, wherein the varistor contact (VK1, VK2) comprises an electrically conductive material, wherein the varistor contact (VK1, VK2) has a substantially planar contact with a varistor pad of a varistor (V) , Wherein the varistor contact has a linear curvature (W) for contacting with a varistor terminal.

13. varistor contact (VKL, VK2) according to claim 12, wherein the line-like curvature (W) is a press and / or folding seam.

14. varistor contact (VKL, VK2) according to claim 12 or 13, characterized in that the linear curvature (W) divides the pad into two symmetrical or two asymmetrical parts.

15. Varistor (V), comprising at least one varistor contact (VK1, VK2) according to one of the preceding claims 12 to 14.

16 Varistoranschluss (VAl, VA2) for contacting a varistor (V) in a housing, wherein the varistor (VAl) at least a portion (AI) for mounting in a housing part, wherein the varistor (VAl) a portion for providing an electrical Contacting outside b of the housing, and wherein the varistor (VAl, VA2) further comprises a portion (A2) for contacting with a varistor contact (VKL, VK2), wherein the varistor (VAl, VA2) is integrally formed.

17 Varistoranschluss (VAl, VA2) according to claim 16, wherein at least a portion for mounting in a housing part is formed so that it makes it difficult to subsequent removal in assembly in the corresponding housing part.

18. Varistor (V), comprising at least one varistor terminal (VAl, VA2) according to one of the preceding claims 16 or 17.

19. Varistor (V) having

A separation unit (AE) according to one of claims 1 to 6,

At least one varistor contact (VK1, VK2) according to one of the preceding claims 12 to 14,

Having at least one varistor connection (VA2, VA2) according to one of the preceding claims 16 or 17.