WO2015106996A1

WO2015106996A1 - Device for leading a part into an explosion-proof housing in a dust ignition-proof manner

Info

Publication number: WO2015106996A1
Application number: PCT/EP2015/050163
Authority: WO
Inventors: Martina Sandow; Ingo Wolff; Artur SCHLOPAKOWSKI; Steffen Buhl
Original assignee: R. Stahl Schaltgeräte GmbH
Priority date: 2014-01-17
Filing date: 2015-01-07
Publication date: 2015-07-23
Also published as: DE102014100492A1

Abstract

Disclosed is a device (10) for leading a part (90) through an opening (21) in a wall (20) of an explosion-protected housing (15) in a dust ignition-proof manner. In one embodiment, an elastically deformable and/or malleable sealing member (49) is arranged directly in the opening (21) in the wall. A clamping arrangement (59) is used for clamping said sealing member (40) against a clamping portion (29) of the wall (20), said clamping portion (29) tapering transversely to a lead-through direction (D). In order to clamp the sealing member (40), the clamping arrangement (59) applies an axial clamping force on the sealing member (40) in the lead-through direction (D). During this process, the sealing member (40) can be at least slightly deformed in a radial direction and comes to rests against the opening (21) in the wall and against the part (90) that is led through the sealing member (40), resulting in a dust ignition-proof arrangement.

Description

Apparatus for the ignition-puncture-free passage of a component into an explosion-proof housing

The invention relates to a device for Zünddurchschlagpassfreie implementation of a component, in particular ei ^¬ nes electrical conductor, through a wall of an explosion ^¬ protected housing, in particular in the ignition protection "flameproof enclosure" (Ex-d) or in the "increased safety "(Ex-e) can be executed.

In order to avoid a transmission of sparks or hot explosive gases from an area with an ignition source within an explosion-proof housing or to de ^¬ ren deletion or cooling in the technical field of explosion protection devices are known to perform, which can withstand an explosion and have gaps that are fire-proof.

The DE 299 03 103 Ul, for example, shows a ^¬ A screw sleeve with a ckung located over the entire axial Erstre- the screw-tapered opening. In the opening, a sealing ring is arranged, which is pressed by means of egg ^¬ ner clamping arrangement with a union nut in the screw-in.

EP 0490637 Al shows a grommet with a screw-in sleeve with an opening with a thread ^¬ section with an internal thread, which adjacent to a threaded portion of the conically tapered cone portion extends. In the threaded portion and in the cone portion, a sealing ring is arranged. On the sealing ring is again a disc. In the internal thread a body is screwed, with the end face pressure on the disc and on the sealing ring is exerted, wherein the sealing ring is pressed axially against the cone section.

From other technical fields, a strain relief arrangement for a cable is known, for example, from US Pat. No. 3,744,008, which has a screw-in sleeve with an opening and an adjoining, initially conically tapering channel, which merges into a cylinder section of the channel. In the cone portion, a koni ^¬ shear elastic body is arranged, which is pressed by means of a clamping arrangement having a nut into the taper portion of the channel and thereby to presses of the process performed by the elastic body cable to provide strain relief.

The DE 79 10 840 Ul shows a pressure-tight wall ^¬ guide with a screw-in sleeve with a channel, the egg ^¬ NEN first cylindrical portion having a first diameter and a second cylindrical portion having a second diameter having. In the sections two two-piece pressure bushes are used, between which an O-ring or a stuffing box is arranged.

Also, DE 198 48 216 C2 shows a device for performing with a screw-in with an opening which has a adjoining the mouth of the opening, conically tapered channel section and a sealing ring which is cylindrical in the relaxed state and with the aid of a union nut and an annular disc in the opening of the screwed ge ^¬ against an inclined ^{surface is} pressed ^¬ , wherein it deforms.

Starting from this state it can be seen as a task of Present invention to provide a cost-effectively manufacturable and compact and ignition-proof device for implementation.

This object is achieved with a device according Pa ^¬ tentanspruch 1 and according to claim. 3

The device is adapted to lead a component - eg a rigid or flexible electrical conductor, a cable, a rail, a pipe or a fluid line - through a wall of an explosion-proof housing. The explosion-proof housing can in particular electrical and / or electronic equipment contained ^¬ th, which may constitute a source of ignition. The wall or the wall portion which belongs to the device is part of a housing which separates the explosion-proof Be ^¬ rich inside of the housing of an explosive ^¬ te environment. The housing can also be part of a housin ^¬ seanordnung with several explosion-proof and / or non-explosion-proof housings, so that the device provides a passage between two inner areas of adjacent housings or between the explosion-proof interior of a housing and the environment to explosion proofed by a component Wall opening in the wall lead. The wall may be a range which according to the degree of protection "flameproof enclosure" (ex-d) and / or "he ^¬ increased safety" (Ex-e) is protected by a range (according to the type of protection "flameproof enclosure" Ex -d) and / or "increased security" (Ex-e) is protected or ei ^¬ nem field area that is not protected by any explosion protection separate.

A first device according to the invention has a feedthrough assembly and a wall of the potentially explosive ^¬ protected housing having a wall opening having a Passage direction (axial direction) determines. The feed-through arrangement is intended and set up to be detachably connected to the wall in particular. To the feedthrough assembly include at least one sealing body and a clamping arrangement with a clamping body.

The wall opening has a clamping portion with a first clamping surface and tapers in the Spannab ^{¬ section} radially and, for example, conically towards the interior of the housing. The first clamping surface therefore has a first angle of attack different from zero degrees, in which the clamping surface is inclined relative to the axial direction. The sealing body is elastically and / or plastically deformable and arranged in the wall opening when the connection is made. The sealing body has a through opening for the component, the component extending through the in montier ^¬ tem condition of the bushing assembly. The cross-sectional contour of the lead-through opening preferably corresponds substantially to the cross-sectional contour of the component carried out and may be, for example, rectangular or round. Preferably, the cross-sectional contour of the passage opening in the passage direction does not change.

The sealing body has a first counter-clamping surface and a second counter-clamping surface. The first counter clamping surface is associated with the first clamping surface of the clamping portion of the Wandöff ^¬ voltage and when connected in this system. By means of the clamping arrangement of the sealing body is pressed during manufacture of the connection against the clamping portion of the wall opening and against the guided through the passage opening member. The purpose of the Spannkör ^¬ per, which is arranged axially adjacent to the sealing body and having a second clamping surface, which is associated with the second Ge ^¬ genspannfläche and when made connection with this in abutment. The sealing body is using the clamping body against the first clamping surface ge ^¬ presses axially.

The ignition-penetration-proof passage is achieved by the axial compression of the sealing body between the two clamping surfaces, wherein the sealing body is deformed and pressed radially inwardly against the component. In this way, gaps are closed or reduced to the extent that the Zünddurchschlagicherheit is guaranteed. Characterized in that the sealing body rests directly on the wall opening and the component, the connection between the feed-through arrangement or the clamping arrangement and the wall of the housing can be made simple and does not even carried out in the close tolerances required in the standard for Zünddurchschlagsicherheit become. For example, a flameproof Gewindever ^¬ connection between the bushing assembly and the wall of the explosion proof enclosure is not required. In one embodiment, in the wall opening, may be adjacent in through direction or at a distance to Spannab ^¬ cut an internal thread to be present, in which a loading ^¬ stand part of the feedthrough assembly and the tensioning assembly is screwed with standard thread may be used without specific ^¬ elle explosion protection measures.

Preferably, the axial distance of the clamping portion of a one side of the wall opening limiting first level is smaller than from the other side of the wall opening limiting second level. The tensioning portion is preferably disposed within an axial region of the wall opening extending from the first plane to half the axial length of the wall opening, wherein the axial length of the wall opening is determined by the distance of the first from the second plane. Preferably, the narrowest point of the clamping section is in a mouth rich arranged the wall opening to the interior of the housing.

Preferably, the sealing body does not protrude out of the wall ^¬ opening through the first and / or the second level.

Preferably, the wall opening axially adjacent, preferably adjacent, on the clamping portion on a clamping ^¬ section with a clamping surface. The sealing body has a counter clamping surface which is connected to the clamping surface in Appendices ^¬ ge. The tension section tapers in by ^¬ gang direction preferably from the clamping portion away. The clamping surface is a separate surface from the first clamping surface. The clamping surface preferably has a second angle of attack with respect to the axial direction, which is smaller than the first angle of attack. Preferably, the sealing body is pressed only radially outwardly against the clamping surface. The second angle is in front ^¬ preferably zero degrees. The clamping surface is closed in a ring around the passage direction and designed, for example, as a lateral surface of a cylinder.

By the clamping surface in addition to the Spannab ^¬ cut a Zünddurchschlagsichere system of the sealing body on the clamping surface is reached, so that the clamping portion axially and / or radially may be slightly shorter without shortening the overall contact surface.

The first clamping surface and / or clamping surface is above ^¬ preferably up to microstructures free of structures, ie particular has no protrusions, recesses, ridges, grooves, slots, threads or the like and can therefore be referred to as a flat surface.

In a second device according to the invention for the ignition-free passage of a component through an ne wall of an explosion-proof housing, the front ^¬ direction on an insert, which is arranged in a wall opening of the explosion-proof housing. The insert has an insertion opening which defines a passage direction (axial direction) and has a clamping section with a first clamping surface and a clamping section with a clamping surface. The insertion hole tapers from ^¬ continuously from the clamping portion in the passage direction in the tension section radially, for example conical. The first clamping surface therefore has a first angle of attack different from zero degrees, in which the clamping surface is inclined relative to the axial direction. The insert is arranged in a wall opening of the explosion-proof housing immovable in the passage direction with a flameproof connection. For example, the insert is screwed into the wall opening with a thread break-proof thread arrangement. The device has a feed-through arrangement, which in particular is releasably connectable to the insert and otherwise corresponds to the feed-through arrangement of the first device according to the invention. The clamping surface is a Spannflä ^¬ che separate from the first surface and may be carried out analogously to the clamping surface of the first device according to the invention.

The clamping surface allows a radially and / or axially relatively compact design of the device with an overall relatively large contact surface of the sealing body to the inner wall surface of the insertion opening. The sealing body is based radially produced on the outside at the prepared connection

Clamping surface. The clamping surface of the rigid insert is undeformable at the prevailing forces here. The sealing body is therefore deformed in an axial compression between the clamping surfaces mainly to the component and presses against its outer surface. As a result, even in the case of elastically deformable components, an ignition-puncture-resistant guaranteed connection.

The second device according to the invention can then be used in ^¬ game example, when a tension section itself can not be provided in the wall opening or to, for example, in thin-wall enclosures. However, the use has to be explosion-proof, for example via an explosion-proof thread, a material- ^locking connection or the like, connected to the wall opening. This can - as explained above - omitted in the first device according to the invention.

The insert may for example consist of metal, plastic or ceramic.

Hereinafter, further preferred Ausführungsbei ^¬ games are explained for the device, which can be used in both solutions of the invention.

The wall opening may be an internal thread or the insert may have an internal and / or external thread. Preferably, the clamping portion and the clamping portion are threaded. The cross-sectional contour of the wall opening or the insertion opening may be round, e.g. circular or elliptical, or square or follow any regular or irregular contour. The passage direction (axial direction) can be defined for example by the connecting line of the centers of the cross sections of the wall opening or insert opening.

Preferably, the clamping portion tapers radially only in the direction of passage to the explosion-proof interior of the housing. By a radial taper is meant a narrowing of the wall opening or insertion opening transverse to the passage direction. Preferably the device has a single clamping section, which tapers uninterrupted (steplessly). Of the

Clamping section preferably tapers conically. The Ers ^¬ te clamping surface may be formed for example by the lateral surface of a truncated cone.

The sealing body is preferably electrically nichtlei ^¬ tend. The sealing body can be made of plastic, metal, an elastomer, for example rubber, such as natural rubber or silicone rubber, or another material which can be deformed or compressed by pressure, or at least comprise such a material. The ^sealing body can have a certain porosity (in the clamped and unclamped state), so that a slow gas exchange between the compartments separated by the wall can take place.

The sealing body is preferably in one piece. It is be ^¬ vorzugt of a material or mixture of materials without a seam or joint ^¬ one piece.

The sealing body has an edge which encloses the passage opening. Preferably, the edge of a radially outer circumferential point is provided to the feedthrough ^¬ opening with a slit. In the case of a plurality of existing feedthrough openings, in each case one slot can be arranged in each case from one circumferential point up to the respective leadthrough opening. The slot can, for example, parallel or oblique to the passage direction duri ^¬ fen. Each slot radially opens the associated port at one location.

Preferably, the sealing body has a radial extension (for example, a diameter) which, in the undeformed initial state, is at most as large as the largest radial one Extension of the wall opening or insertion opening.

Preferably, the sealing body has a first sealing body portion, which carries the first counter-clamping surface. The first counter-clamping section preferably already tapers in undeformed state when the sealing body is not inserted into the wall opening or insertion opening. Preferably, the first counter-clamping section tapers conically. Preferably, the cone angle of the f ^¬ th counter clamping section in the undeformed condition of the sealing ^¬ body is equal to a cone opening angle of the first clamping portion ^¬.

In one exemplary embodiment, the second counter-clamping surface on the sealing body can be oriented obliquely or preferably at right ^angles to the passage direction.

The first and / or second counter-clamping surface of the sealing ^¬ body may - apart from the roughness or porosity of the material and apart from any slot in the

Sealing body - made free of projections and / or depressions, so that it rests flat against the respectively associated clamping surface.

Preferably, the sealing body is arranged axially completely within ^¬ within the wall opening or within the insertion opening.

The clamping arrangement may comprise a clamping sleeve (preferably in one piece) with a thread. The thread of the clamping sleeve may be an internal or external thread, which is in engagement with a corresponding mating thread on the wall opening or the insertion opening.

The clamping sleeve can in one embodiment the Form clamping body of the clamping arrangement. An end face of the clamping sleeve may form the second clamping surface, which is in contact with the second counter-clamping surface. Between the clamping ^¬ sleeve and the sealing body may alternatively be used as a separate component, for example in the form of a clamping plate or a clamping ring, the clamping body, which mediates the introduced via the clamping sleeve force to the sealing body. By ge ^¬ screwed into or onto the mating thread clamping sleeve the second clamping surface is pressed axially ge ^¬ gen the sealing body.

It is also possible to use a thread-free collet release a ^¬ which is pressed overall on the clamping body or the sealing body and - for example, by turning - with egg ^¬ nem arranged in the wall opening or insertion hole or in the wall or the use of locking means is engaged.

Preferably, the clamping member is disposed entirely axially inner ^¬ half of the wall opening or the insertion opening.

The clamping body is preferably in one piece and completely closed in the circumferential direction. The clamping body can have at least one axial web or an axial extension, and can serve for positioning relative to the clamping sleeve.

In one embodiment, a modified tensioning arrangement may be used. In this case, the sealing body has a through hole, wherein the clamping arrangement, an elongated fastening element and a counter-clamping element, such as a counter clamping plate belongs. The fastening ^¬ tion element, such as a screw, a rod, a bolt or the like, is guided through the through hole in the sealing body and thus through the wall opening. It is arranged axially adjacent to the sealing body on the opposite side of the clamping body. The fastening ^¬ tion element is at least indirectly engaged with the clamping body and the counter-clamping element of the clamping arrangement. For example, the fastening element may be a Ge ^¬ winds have engaged with a thread of the Gegenspannele- ments or of the tensioning body engage and are supported at the other end on the clamping body or on the counter clamping member. About the fastener, a tensile ^¬ force between the clamping body and the counter-clamping element can be transmitted, whereby the sealing body between the two clamping surfaces is axially compressed. In this case, the sealing body is pressed not only to the performed component - as described above - but also against the fastener. As a result, a Zünddurchschlagicherer gap is created between the attachment ^¬ element and the sealing body. The sealing body can also be axially supported on the counter-clamping element. The clamping body, the sealing body, the clamping section and / or the Gegenspannele ^¬ ment form, so to speak, a sandwich structure.

The counter-clamping element is preferably a separate component, but may alternatively be a component of the insert or the wall.

Preferably, the clamping body is arranged at least partially axially within the wall opening or the insertion opening in this modified clamping arrangement.

Preferably, the clamping sleeve and / or the insert has an annular surface, for example on a collar or a flange, which is associated with a wall surface of the wall. Between the annular surface and the wall surface, a ^seal can be fastened or clamped. As a result, in addition to the explosion protection, an IP degree of protection for the Reach housing, such as protection against dust or spray, etc.

In an edge region of the clamping sleeve, an attack contour (for example, hexagonal contour) may be formed in order to be able to clamp the clamping sleeve relative to the wall or to the insert with a tool. The attack contour can for example also be formed on the flange or collar with the annular surface.

The first clamping surface extending transversely to the passage direction of ^¬ an inner contour to an outer contour. The inner contour has a lateral surface extending koaxi ^¬ al to the passage direction and the cross-section ^¬ contour is defined by the edge contour of the inner edge of the first clamping surface assigned to the interior of the housing side. Corresponding to this, the Außenkon ^¬ structure is a circumferential surface, extending coaxially to the through-Rich ^¬ tung and their cross-sectional contour is determined by the edge shape of the outer edge of the first cutting face on the opposite side of the inner edge. The second clamping surface is preferably arranged within the ringför ^¬ shaped space, which is located between the inner contour and the outer contour and protrudes radially neither through the inner contour nor the outer contour. Characterized that an initiated by the second clamping surface of the sealing body axial force component is supported on the ers ^¬ th rake face and the sealing body in particular ^¬ sondere not suppressed by the inner edge of the first Spannflä ^¬ surface is achieved. Particularly preferably, the second clamping surface extends in the circumferential direction about the passage direction along the inner contour and / or the outer contour.

The inner contour and the outer contour are preferably each circular, but may also be different and for example, each be square or elliptical, or have a different contour shape.

The clamping body and / or the clamping sleeve and / or the insert may for example consist of metal, plastic or ceramic.

Further advantageous embodiments of the invention erge ^¬ ben from the dependent claims and the description of the figures. The drawing is to be used in addition embodiments of the invention will be explained in more detail with reference to the accompanying drawings.

In a schematic representation:

1a, b are each a highly schematic Prinzipdar ^¬ position of an explosion-proof housing with a device for Zünddurchschlagi- chere implementation of a component through a wall opening

FIG. 2 shows a device according to FIGS. 1a, 1b according to a first embodiment in a perspective illustration in a longitudinal section,

2a shows the device of Figure 2 in an exploded view in a longitudinal section,

3a, b an embodiment of a sealing body in a plan view and in a longitudinal section,

4a, b, another embodiment of a sealing ^¬ body in a plan view and in a longitudinal section, 5 shows a device according to another embodiment in a perspective view in a longitudinal section,

6 shows a device according to a further embodiment in a perspective view in a longitudinal section, FIG.

Figure 7 shows a modification of the device of Figure 5 in a perspective view in a longitudinal section.

In the drawing, various Ausführungsbeispie ^¬ le of a device 10 for explosion-proof implementation of a component 90, for example a cable, a grounded busbar or other insulated or non-insulated conductor through a wall opening 21 in a wall 20 of an explosion-proof housing 15 Darge ^¬ represents. The component 90 may be rigid or flexible. By the device 10, the component is in particular force ^¬ conclusively connected to the wall 20, so that a Hal ^¬ effect or a strain relief can be achieved.

The interior of the housing 15 serves to accommodate ignition sources that could ignite a potentially explosive atmosphere in an environment 17. Is, for example according to an explosion-proof housing 15 of protection "flameproof enclosure (Ex d)." The Vorrich ^¬ tung 10 prevents sparks, hot gases, flames or the like, which could trigger an ignition of the atmosphere from the protected The interior space 16 can escape through the wall opening 21 without being cooled or extinguished, as shown in FIGS. 1a and 1b, the device 10 can be inserted into or into a wall opening 21 of a wall 20 which encloses the explosion-proof area in the interior 16 from another area - in particular a region having explosive atmospheres - separates the other portion, for example, the Reversed ^¬ bung 17 (Figure la), or an inner space 18 of an adjacent further housing 19 may be (Figure lb) the more Ge ^¬ housing 19th may contain an explosive atmosphere or be explosion-proof The wall 20 has a first wall surface 22 and a entgegenge ^¬ sat second wall surface 28. According to the example, the second wall surface 28 facing the interior 16 and the first wall surface facing away 22 thereof. The explosion-proof housing 15 and thus the wall 20 may for example consist of metal, plastic or Ke ^¬ ramik.

FIGS. 2 and 2 a ^illustrate a first embodiment of the device 10. The wall opening 21, which has a wall opening section opening into the first wall surface 22, is arranged in the wall 20. This Wandöff ^¬ dryer section is cylindrical in the present embodiment, and preferably circular cylindrical contoured and therefore referred to as cylinder portion 23, with its Zy ^¬ linder axis, for example in accordance perpendicular to the first wall surface 22nd In the cylinder portion 23 of the wall ^¬ surface 22 partially and here to about half of the Axia ^¬ Lerstreckung 24 of the cylinder portion 23, an internal thread 25 is cut. The remaining wall opening surface of the wall opening 21 and / or the cylindrical portion 23 is structurally executed except for microstructures or the roughness and has no projections or depressions, so that the remaining wall opening surface can be ^{¬ be} distinguished as a flat surface. Characterized adjoins the Innenge ^¬ thread 25 is a flat cylindrical wall surface 26 with a through ^¬ knife 27 at.

Adjacent to the cylinder portion 23, the wall ^¬ opening 21 has a in the direction of the second wall surface 28 towards tapered clamping portion 29. The conically tapered at ^¬ game according clamping section 29 has ei ^¬ ne first clamping surface 30, which is for example in accordance with the cladding ^¬ surface of a truncated cone.

The first clamping surface 30 is thus in a longitudinal ^¬ section at each circumferential location straight, but may be, for example, also be curved in this Abwand ^¬ lung, so that the clamping surface 30 forms part of a toroidal surface. The cylinder wall surface 26 of the first Zylinderab ^{¬ section} 23 is continuously on the first clamping surface 30, wherein the transition may have a sharp edge or a rounded transition region. The first clamping portion 29 or, as in the embodiment, an adjoining the first clamping portion 29 end portion 31 terminates in the second wall surface 28. The end portion 31 is cylindrical according to example, preferably circular cylindrical, and may also be omitted in other embodiments.

The first clamping surface 30 merges continuously into the surface 32 of the end section 31 to form an edge or a rounded transition surface. In the illustrated apparatus 10, the axes of the cylinder portion 23 and the chuck portion 29 and the optional end portion 31 coincide and define a passage direction D. The first clamping surface 30 is inclined at an angle of attack Wl with respect to the passage direction D. The amount of the angle of attack Wl is in the range of 35 ° to 65 ° and preferably 45 ° to 55 °. The Zylinderwandflä ^¬ surface 26 is coaxial with the passage direction D.

To the device 10 includes a ^{Durchführungsanord ¬} tion 35, which has an elastically and / or plastically deformable sealing body 40. The sealing body 40 is arranged in the wall opening 21 when the connection of the feed-through arrangement 35 with the wall 20 has been established. The sealing body 40 may for example consist of silicone and / or rubber or the like.

In the figures 3a and 3b, an embodiment of the sealing body 40 for the dargestell ^¬ te in Figures 2 and 2a embodiment of the device 10 in the undeformed initial state outside the wall opening 21 is shown. Of the Sealing body 40 is made in one piece. It has a ke ^¬ gelstumpfförmigen first sealing body portion 41 and a cylindrical second sealing body portion 42. The second seal body portion 42 connects to the larger diameter side of the first seal body portion 41. In the sealing body 40, a passage opening 43 for the component 90 is arranged centrally ^¬ along the cylinder axis. The passage opening 43 is preferably adapted in its shape and size to the component 90. In exporting approximately ^¬ for example the passage opening 43 is cylindrical and its diameter 44 is in the state not in accordance with internals, for example slightly smaller than that of the component to be carried out 90 having a Cylind ^¬ generic contour here in the wall opening 21st For easier insertion of the component 90 in the passage opening 43, an edge 45 which surrounds the passage opening annularly, provided at a peripheral point 46 to the passage opening 43 with a slot 48. The slot 48 extends in a radial plane with respect to the axis of the passage opening 43 but may alternatively also be oriented at an angle other than zero degrees thereto.

The first conical sealing body portion 41 has ei ^¬ NEN cone opening angle W2. The amount of Konusöff ^¬ angle is, for example, twice as large as the Be ^{¬ contribution of} the angle of attack Wl the first clamping surface 30 against ^¬ over the passage direction D. The second sealing body portion 42 is cylindrical in the embodiment, but may for example also be conical and in particular ^¬ special have a cone opening angle which is smaller than the cone opening angle W2 of the first sealing body ^¬ section 41st

The first sealing body section 41 has a first axial extension 50 and the second sealing body section 42 has a second axial extension 51. The second Axia ^¬ lerstreckung 51 is preferably at least as large as half the first axial extension 50. The maximum Radialerstre ^¬ ckung 52 of the sealing body 40 corresponds to the diameter of the second seal body portion 42nd

The sealing body 40 terminates axially with a first end face 53 of the first sealing body portion 41 and egg ^¬ ner second end face 54 of the second Dichtkörperab ^{¬ section} 42 from. The end faces 53, 54 are in Wesentli ^¬ chen flat and are perpendicular to the axial direction of the through hole 43 and aligned in the installed position of the sealing body at right angles to the passage direction D.

The radial extension 52 of the sealing body 40 is selected so that the sealing body 40 as possible without clamping in the wall opening 21 of a wall 20 shown by way of example in FIG arrange 1 and can be introduced in particular in the passage direction D. The radial extent 52 of the sealing body 40 is for example as large as the diameter 27 of the cylinder portion 23 of the wall opening 21, which represents the largest inner radial extent of the wall opening 21. Preferably, the radial extent 52 of the sealing body 40 is smaller by an insertion clearance of, for example, at most 1 to 3 mm. The sum of the Axialerstre ^¬ ckungen 50, 51 of the sealing body 40 is preferably Hoechsmann ^¬ least so great that the sealing body 40 in inserted into the Wandöff ^¬ voltage 21 and clamped state not axially beyond the first wall surface 22 and / or the second wall surface 28 survives. Preferably, the sealing body 40 is disposed axially entirely within the wall opening 21.

FIG. 2 shows a sealing body 40 according to FIGS. 2a, 3a, 3b in a clamped state. The sealing body 40 is pressed against the clamping section 29 of the wall opening. 21 clamped, wherein a conical surface of the first sealing body portion 41 is pressed against the first clamping surface 30 and a first counter-clamping surface 55 of the Dichtkör ^¬ pers 40 forms. A second counter-clamping surface 56 is defined by at least one annular region and, for example, the radially outermost annular edge region of the second

Face 54 formed. In the embodiment described here, the cylinder wall surface 26 forms a clamping ^¬ surface 33 and the circumferential surface of the second section 42 Dichtkörperab ^¬ a mating clamp face 57th

For clamping or clamping of the sealing body 40 in the wall opening 21, a clamping arrangement 59 is used with a clamping body 60, on which a second clamping surface 61 is present ^{¬ present} . The second clamping surface 61 is preferably ent ^¬ speaking the first rake face 30 and / or the Klemmflä ^¬ che 33 just formed without recesses or protrusions. In the embodiment of Figure 2, 2a, the clamping ^¬ body 60 is annular and has an annular closed second clamping surface 61. The second clamping surface 61 is associated with the second counter-clamping surface 56 and is at manufactured connection of the feedthrough assembly 35 with the wall 20 at this , In this case, the annular clamping body 60 is preferably completely within the wall opening 21.

The clamping body 60 has an annular axial extension 63 on its upper side 62 opposite the clamping surface 61. The outer diameter of this axial extension 63 is reduced relative to the second clamping surface 61 aufwei ^¬ send annular portion 64, whereby a contact surface 65 is formed around the axial ^¬ extension 63 around.

By way of example, a clamping sleeve 80 is assigned to the clamping body 60. The clamping sleeve 80 is in installation position an end face 81 on the contact surface 65 of the clamping body 60 at. The contact surface 65 and the end face 81 form a plain bearing. The clamping sleeve 80 carries an external thread 82 which can be brought into engagement with the internal thread 25 of the wall opening 21. In a modification of the present embodiment, the clamping body 60 and clamping sleeve 80 can be made of a single part without seam and joint Herge ^¬ .

The clamping sleeve 80 has an attack contour 83, in ^¬ example, an external hexagonal contour for a tool. The attack contour 83 is formed, for example, on a radially over the external thread 82 projecting collar 84. The collar 84 is arranged on the end face 81 axially ent ^¬ opposite side of the clamping sleeve 80. The Kra ^¬ gene 84 projects beyond a peripheral region of the wall opening 21 on the first wall surface 22 in the installed position. Between the collar 84 and the first wall surface 22, a sealing ring 85 can be arranged and clamped.

In the installed position, ie when the feed-through arrangement 35 is made with the wall 20, the second clamping surface 61 is located within an annular space 72. This annular space 72 is bounded radially inward by an inner contour 70 and radially outwardly by an outer contour 71. The inner contour 70 is a cylinder jacket surface whose cross-sectional contour coincides with the inner edge 30a of the first clamping surface 30, wherein the outer contour 71 is a cylinder jacket surface whose cross-sectional contour matches the outer edge 30b of the first clamping surface 30. The inner contour 70 extends along the surface 32, for example in accordance with the end portion 31 and the outer contour 71 he ^¬ extends along, for example according to the cylinder wall surface 26 of the cylinder portion 23 coincides. The device 10 may be composed ^¬ the following:

The clamping sleeve 80, the optional sealing ring 85, the clamping body 60 and the sealing body 40 are pulled or plugged onto the component 90. The sealing body 40 is positioned at the location on the component at which the component 90 is to pass through the wall opening 21. Then the

Sealing body 40 positioned in the wall opening 21.

The clamping sleeve 80 is screwed into the internal thread 25 of the wall opening 21. By axial extension 63 of the clamping body 60 is positioned relative to the clamping sleeve 80 so that its second clamping surface 61 rests against the second counter-clamping surface 56. In this case 60 transmits the tension body, the axial force of the screw connection between the adapter sleeve 80 and the wall 20 to the second counter clamping surface 56 of the sealing body 40. Due to the sliding bearing contact Zvi ^¬ rule of the clamping sleeve 80 and the clamping member 60, the clamping member 60 does not rotate and moves only in passage ^¬ direction D. The rotational movement of the clamping sleeve 80 in the circumferential direction about the passage direction D is thus not transferred to the sealing body 40.

The sealing body 40 is pressed axially in the passage direction D against the first clamping surface 30 and thus compressed between the two clamping surfaces 30, 61 and thereby deforms radially. Thereby, the sealing body 40 is pressed in the region of its passage opening 43 against the component 90 radially inwardly and according to the example also with its counter-clamping surface 57 against the clamping surface 33. The under compression sealing body 40 therefore applies at least in sections flat against the first clamping surface 30, the clamping surface 33 and the component. As a result, both in the system to the component 90 and in the system to the wall opening 21 each a Zünddurchschlagicherer gap created.

By the adjusting movement of the clamping sleeve 80 of the sealing ring 85 between the collar 84 and the first wall surface 22 is tensioned. Thereby, additional sealing (e.g., IP protection) of the device 10 can be achieved.

As a result of the fact that the sealing body 40 produces a connection resistant to ignition ignition, not only relative to the component 90, but also directly opposite the wall opening 21, it is not necessary to make the threaded connection between the internal thread 25 and the external thread 82 so that it is flameproof, which results in the manufacture of the device 10 simplified.

Figure 5 shows a modified embodiment of the feedthrough assembly 35 with a likewise modified sealing body 40, which is shown in Figure 4a, b.

In contrast to the wall opening 21 from FIG. 1, a modified clamping arrangement 59 is used here, wherein no direct screw connection with the wall opening 21 takes place. The first cylinder section 23 of the wall opening 21 therefore has no internal thread in this embodiment (FIG. 5). The clamping sleeve 80 is not present. The end portion 31 can be omitted. The clamping assembly includes a fastening element such as a clamping bolt and a screw according to example 95, which connects the Spannkör ^¬ per 60 having a counter clamping member, for example in accordance with egg ^¬ ner counter clamping plate 97th The clamping body 60 is designed plate-shaped in contrast to the first embodiment according to the fi gures ^¬ 1 to 3 and has to be performed for each component 90 has a component opening 101, which here eccentrically, for example, distributed around the circumference, in particular at a uniform distance, are arranged. Centered along its longitudinal axis, the clamping body 60 has an opening 102 for the fastening element, thus, for example, the screw 95. With a head 103, the screw 95 is located on the peripheral region around the Durchbre ^¬ tion 102 on the clamping body 60 at. The clamping body 60 has in this embodiment, a collar 84 which is arranged in the first embodiment of the clamping sleeve 80. The collar 84 is adjoined by a cylindrical clamping part 96 with the second clamping surface 61 arranged on the front side. The clamping part 96 and consequently the clamping surface 61 are here penetrated by the component openings 101 and the opening 102. The clamping portion 96 may have a diameter aufwei ^¬ sen, which is slightly smaller than the diameter of the form cylinder portion 23 of the wall opening 21 and with this an annular radial gap in the circumferential direction.

The sealing body 40 has a through hole 104 for the clamping bolt or the screw 95, which is aligned in the installed position with the opening 102 of the clamping body 60. To the through hole 104 are, for example according to a plurality of disposed through ^¬ guide openings 43 each for a component 90, which are aligned in the installed position, each with a component opening 101 of the chuck body 60th Each passage openings 43 is open as in the first embodiment, each with a slot 48 through the edge 45 of the sealing body 40 at a circumferential location 46.

The second axial extension 51 of the cylindrical second seal body portion 42 is greater than the first Axia ^¬ lerstreckung 50 of the first seal body portion 41. In the Ov ^¬ ring of the sealing body of Figure 4a, b to that of FIG 3a, b corresponds to.

The counter clamping plate 97 has according to the Spannkör- per 60 and the sealing body 40 for each component to be performed through an opening 100 which are each aligned with a through ^¬ guide opening 43. In addition, the plate has Gegenspann- 97 in the middle of a hole, such as a threaded ^¬ debohrung 99, which respectively aligned with the through hole 104th

The counter clamping plate 97 is closed according to the example except for the openings 100 and the hole or the threaded hole 99. The clamping body 60 is analogous to this closed except for the opening 102 and the component openings 101.

In the illustrated embodiment, the counter-clamping plate 97 is a separate part of the wall 20, but may also be an integral part of the wall 20. Accordingly, the counter clamping plate 97 made of metal,

Plastic or ceramic.

To tighten the sealing body 40 against the Spannab ^{¬ section} 29, the screw 95 pulls the clamping body 60 and the counter-clamping plate 97 toward each other, whereby the second clamping surface 61 presses against the second counter-clamping surface 56 of the sealing body 40. The sealing body 40 is zwi ^¬ tween the two clamping surfaces 30, 61 axially compressed and axially and radially deformed, analogous to the first embodiment ^¬ example. The sealing body 40 is thereby pressed against the components 90 and the screw 95 and produces the ignition-proof system. The sealing body 40 can also be supported on the counter clamping plate 97, in particular if - as illustrated here - the clamping section 29 or the clamping surface 30 of the wall opening directly adjoins the second wall surface 28. Characterized in that the sealing body is pressed out of the clamping portion 29 or so ^¬ even out of the wall opening 21, 40 is prevented. If the wall opening 21 has an end section 31 in a modified embodiment, then the counter-clamping plate 97 in a modified embodiment may have a preferably cylindrical support part which projects into the end section 31 to move the sealing body 40 in the transition between the clamping section 29 and the end section ^¬ cut 31 support.

The screw 95 used here can very easily be screwed to the threaded bore 99 of the counter-clamping plate 97 for mounting the device and be supported with its head 103 on the clamping body 60. In this case, the collar 84 of the clamping body 60 rests against the first wall surface 22 and the counter clamping plate 97 against the second wall surface 28. Otherwise, the sequence of assembly essentially corresponds to that of the first embodiment.

FIG. 6 shows a further embodiment of a device 10 according to the invention, which has an insert 105, which is screwed into the wall opening 21. The wall ^¬ opening is embodied exclusively cylindrical and has an ex-internal thread which cooperates with a former external thread on a threaded portion 107, to prepare a flame transmission fail-safe threaded connection between the insert 105 and the wall opening 21st The threaded portion 107 is hollow cylindrical and has a first end 109 of the A ^¬ set 105.

The insert 105 on the side opposite the first end 109 has a further hollow cylindrical receiving part 108 with an insertion opening 106 which opens at a second end 110. The longitudinal axis of the insertion opening 106 defines the passage direction D. In the transition between the receiving part 108 and the threaded portion 107 is an annular step 111 is formed, which is assigned in the installed position of the first wall surface 22 and abut it or can receive a sealing ring 85 therebetween. On the receiving part 108, for example, in the amount of the annular surface 111, an attack ^¬ contour 83 (eg hexagonal outer contour) may be formed for a tool.

By way of example, the insertion opening 106 is configured analogously to the wall opening 21 in the first exemplary embodiment according to FIGS. 1 to 3. In the receiving portion 108 of the conical clamping portion 29 is provided with the first conical clamping surface 30, which is preferably a cone ^¬ stump lateral surface. The clamping section 29 tapers conically in the direction of the threaded portion 107.

Axially adjacent to the larger diameter side of the clamping surface 30, the receiving part 108 on the cylinder portion 23. In connection to the two ^¬ te end 110 of the cylinder portion 23 has an internal thread 25 for the clamping sleeve 80. The remaining unthreaded Zy ^¬ relieving wall surface 26 of the cylinder portion 23 forms the clamping surface 33 of the clamping portion 23. The Zylinderwandflä ^¬ surface 26 of the first cylindrical portion 23 is continuously in the first clamping surface 30 via. The first clamping surface 30 is steplessly in a sharp Kate or rounded in the inner surface 32 of the clamping portion 29 on ^¬ closing end portion 31 of the insertion opening 106, which is arranged in the threaded portion 107.

In the receiving part 108, a sealing body 40 is disposed within the insertion opening 106, as described in connection with Figure 1 to 3. However, the second cylindrical portion 42 has sealing body in the exporting ^¬ approximate shape of Figure 6 on a second axial extension 51 which is greater than the first axial extension 50 of the first Sealing body portion 41 (as shown, for example, in Figure 4a, b ge ^¬ shows). Accordingly, the counter clamping surface 57 of the sealing body is axially longer than the first Gegenspannfla ^¬ surface 55th

In this embodiment, the clamping body 60 and the clamping sleeve 80 is used as in the embodiment of Figures 1 and 2a, 2b for tensioning the sealing body 40 against the clamping ^¬ section 29, wherein the clamping body 60 are arranged completeness ^¬ dig within the insertion opening 106. Also analogous to this first embodiment, the clamping sleeve 80, the end face 81 rests against the contact surface 65 of the clamping ^¬ body 60, for clamping the sealing body 40 between ^¬ tween the second clamping surface 61 of the clamping body 60 and the first clamping surface 30 of the insert 105 with her Außenge ^¬ winds 82 screwed into the internal thread 25 of the insert 105 ge ^¬ . After screwing the insert 105 into the wall opening 21, the sealing body 40, the clamping body 60 and the clamping sleeve 80 can be arranged analogously to the procedure in the first embodiment on the component 90 and connected to the insert 105.

FIG. 7 shows a modification of the embodiment shown in FIG. 6 with an insert 105 which has a plurality of insertion openings 106 and can be arranged in a wall opening 21 (not illustrated).

In all embodiments, a clamping arrangement 59 with clamping sleeve 80 or with clamping bolt or

Screw 95 and a counter-clamping element, for example in the form of a counter-clamping plate 97 are used. It is possible in all embodiments to perform one or more components 90 and provide correspondingly many passage ^¬ openings 43 in the sealing body 40 and, if necessary, in the other components. A device 10 for the ignition-free passage of a component 90 through a wall opening 21 of a wall 20 of an explosion-proof housing 15 is provided. In one embodiment, an elastically and / or plastically deformable sealing body 40 is arranged directly in the wall opening 21. The sealing body 40 is tensioned by means of a clamping arrangement 59 against a transverse to a passage direction D tapered clamping portion 29 of the wall 20. For clamping, an axial clamping force in the passage direction D is exerted on the sealing body 40 with the aid of the clamping arrangement 59. At the same time, the sealing body D can deform at least slightly radially and bears against the wall opening 21 as well as the component 90 guided through the sealing body 40, which leads to an ignition-proof arrangement.

Reference sign list:

10 device

15 Explosion-proof housing

16 Interior of the explosion-proof housing

17 environment

18 Interior of the other housing

19 Further housing

20 wall

21 wall opening

22 First wall surface

23 cylinder section

24 axial extension

25 internal thread

26 cylinder wall surface

27 diameter

28 Second wall surface

29 tensioning section

30 first clamping surface

30a inner edge

30b outer edge

31 end section

32 area of the end section

33 clamping surface

35 implementation order

40 sealing bodies First sealing body section Second sealing body section Through opening

diameter

edge

peripheral location

Slot First axial extension

Second axial extension Radial extension

First face

Second face

First counter-clamping surface

Second counter-clamping surface Counter clamping surface Clamping arrangement

tensioning body

Second clamping surface

top

axial extension

ring section

Contact surface inside contour

outer contour

annulus 80 clamping sleeve

81 front side

82 external thread

83 parking section

84 collar

85 sealing ring

90 component

95 screw

96 clamping part

97 counter clamping plate

99 threaded hole

100 opening in the counter clamping plate

101 component opening

102 opening in the clamping body

103 head

104 through hole of the sealing body

105 use

106 insertion opening

107 threaded part

108 recording part

109 First End

110 Second end

111 ring step

D passage direction

U circumferential direction W1 angle of attack

W2 cone opening angle

Claims

Claims:

1. Device (10) for ignition-free passage of a component (90) through a wall (20) of an explosion-proof housing (15),

- wherein the wall (20) has a wall opening (21) defining an axial passage direction (D) and a clamping portion (29) having a first clamping surface (30), wherein the wall opening (21) in the clamping portion (29) radially tapered,

- With a feedthrough assembly (35) with a

elastically and / or plastically deformable, in the wall opening (21) arranged sealing body (40) having a passage opening (43) for the component (90), a first counter-clamping surface (55) and a second counter-clamping surface (56), wherein the first Counter clamping surface (55) with the first clamping ^¬ surface (30) in abutment, with a clamping arrangement (59) for clamping the sealing body (40) against the clamping portion (29) of the wall opening (21) and against the through the passage opening (43). guided component (90), wherein the clamping arrangement (59) has a clamping body (60), which is arranged axially adjacent to the sealing ^¬ body (40) and a second clamping ^¬ surface (61) which with the second counterpart clamping surface (56) is in plant.

2. Device (10) according to claim 1, characterized in that the wall opening (21) axially adjacent to the clamping portion (29) has a clamping portion (23) with a clamping surface (33) and that of Sealing body has a counter clamping surface (57) which is in contact with the clamping surface (33).

3. Device (10) for ignition-free passage of a component (90) through a wall (20) of an explosion-proof housing (15)

- an insert (105) which is arranged in a wall opening (21) of the wall (20), with a Einsatzöff ^¬ tion (106) defining an axial passage direction (D) and a clamping portion (29) having a first clamping surface ( 30), wherein the insertion opening (106) tapers ra ^¬ dial in the clamping section (29), wherein the insert (105) in the wall ^¬ opening (21) in the passage direction (D) immovably by means of a flameproof connection (107) is

- A feed-through arrangement (35) with an elastically and / or plastically deformable, in the insertion opening (106) arranged sealing body (40) having a passage opening (43) and a first counter-clamping surface (55) and a second counter-clamping surface (56) wherein the first Gegenspann- surface (55) with the first clamping surface (30) in at ^¬ location,

- With a clamping arrangement (59) for clamping the

Sealing body (40) against the clamping portion (29) of the insert opening (106) and against the through the passage opening (43) guided member (90), wherein the clamping arrangement (59) has a clamping body (60), which axially adjacent to the sealing body (40) is arranged and a second Clamping surface (61) which is in abutment with the second counterpart clamping surface (56),

- wherein the insertion opening (106) axially adjacent to the clamping portion (29) has a clamping portion (23) with a structure-free clamping surface (33) and that the sealing body has a counter clamping surface (57) which is in contact with the clamping surface (33).

Device (10) according to one of the preceding claims, characterized in that the clamping arrangement (59) has a clamping sleeve (80) with a thread (82) which is provided with a mating thread (25) on the wall opening (21) of the wall (20). or engages the insertion opening (106) of the insert (105).

Feedthrough arrangement (10) according to one of the preceding claims, characterized in that the Dichtkör ^¬ by (40) has a through hole (104), and that the clamping arrangement (59) has an elongated fastening ^¬ element (95) and a counter-clamping element (97) wherein the fastening element (95) through the through ^¬ hole (102) and through the wall opening (21) or said insertion opening (106) is guided, wherein the counter clamping member (97) axially adjacent to the sealing body (40) on the clamping body ( 60) is arranged opposite side and wherein the fastening element (95) with the Spannkör ^¬ by (60) and the counter-clamping element (97) of Spannano ^¬ tion (59) is connected.

6. Device (10) according to one of the preceding claims, characterized in that the fastening element (95) biases the clamping body (60) against the sealing body (40) and the sealing body (40) is thereby pressed against the fastening element (95).

7. Device (10) according to any one of the preceding claims, characterized in that the clamping body (60) ^{¬ at} least partially axially within the wall opening (21) or the insertion opening (106) is arranged.

8. Device (10) according to any one of the preceding claims, characterized in that the sealing body (40) ei ^¬ ne radial extent (52) which is in the undeformed initial state, at most as large as the largest radial extent (27) of Wall opening (21) or the insertion opening (106).

9. Device (10) according to one of the preceding claims, characterized in that the clamping body (60) or the clamping sleeve (80) or the insert (105) has a collar (84) or an annular surface (111), the or which projects beyond a circumferential area of a wall surface (22) around the wall opening (21).

10. Device (10) according to one of the preceding claims, characterized in that extending the first Spannflä ^¬ che (30) transversely to the passage direction (D) of an inner contour (70) to an outer contour (71).

11. Device (10) according to claim 10, characterized in that the second clamping surface (61) in ^¬ within the space (72), which is bounded by the inner contour ^¬ (70) and the outer contour (71).

12. Device (10) according to any one of the preceding claims, characterized in that the sealing body (40) ei ^¬ NEN edge (45) which at a peripheral location

(46) to the passage opening (43) has a slot

(48).

13. Device (10) according to one of the preceding claims, characterized in that the sealing body (40) is arranged completely within the wall opening (21) or within the insertion opening (106).