DE2854028A1 - HOUSING FOR EXPLOSION-PROTECTED RECEPTION OF ELECTRICAL SWITCHGEAR - Google Patents

Description

BROWN, BOVERI & CIE AKTIENGESELLSCHAFT Mannheim December 13, 1978

Mp.no. 679/78 ZPE / P4-Ft / Ma

Housing for explosion-proof housing of electrical switchgear -

The invention relates to a housing for the explosion-proof accommodation of electrical switching devices with a pressure-resistant one

arranged space in which the switching devices / and in the drive means the switching devices and connecting cables to the switching devices are introduced in a flameproof manner.

The VDE regulations 0171, which the structural design and dimensioning of electrical devices in potentially explosive areas, stipulate that there, where Sparks are generated during operation on a switching device, the spark-generating parts are arranged in a pressure-tight space must be. A connection space for increased safety is assigned to this pressure-tight space. There are now two Possibilities: The room for increased security and the permanent contacts are directly connected to the pressure-proof room of the switchgear are led out directly into the connection area for increased safety; you can go there with one Be connected cable tail, wherein the connection space increased security can optionally be poured. There is also the option of installing a housing whose interior complies with the regulations for increased safety,

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to use the flameproof switchgear.

Both solutions are common per se and, from a security point of view, quite optimal; one tries, however, in the train the further development of explosion-proof switching devices to simplify the design effort.

An electrical switching device has now become known (DE-OS 2 617 965) in which a normal commercially available Switching device is used without a flameproof enclosure in a flameproof housing. The line feed there is also increased safety here via a connection space.

With this arrangement, only an electrical switching device is accommodated in the pressure-resistant housing. Additional Connection terminals or other switching devices cannot be installed.

The object of the invention is to provide a housing of the type mentioned in which not only one electrical switching device, but several can be used and with the terminals or terminal blocks can be installed without increased installation effort.

This object is achieved according to the invention in that the housing to form the pressure-tight space a pot-shaped, with a parallel to the bottom of the same Housing part provided with a partition wall has that the partition wall corresponds to the number of switching devices Has openings, possibly with through openings through which the drive means are flameproof are passed through, provided closure parts are closed.

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An advantageous embodiment consists in that the closure parts are inserted into the openings in the intermediate wall are screwed in, the thread being dimensioned so that prescribed gap lengths and gap widths are achieved

To form a space through which the drive means or other parts can be passed through, the wall of the cup-shaped housing part continue beyond the intermediate wall in a projection corresponding to the wall, the Projection protrudes beyond the closure parts and the drive means; the space thus formed is then by means of a Cover closable, in which openings can be provided coaxially to the openings in the partition wall, in which the drives can be inserted and fastened, which are connected to the drive means.

The closure part can advantageously be designed so that it has a cylindrical section and at one end of the cylindrical portion has a radially extending portion, the outer surface of the cylindrical Section has a thread with which the closure part can be screwed into one of the openings in the partition. This closure part is used for the flameproof passage of the drive means.

A further embodiment of the invention can be as follows: that at least one of the closure parts is designed so that it at least partially surrounds a lamp, and that the has a free outwardly protruding end a pressure-resistant transparent disk inserted.

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In yet another embodiment of the invention, there is the possibility of forming the pressure-tight space To provide housing section with a removable or detachable bottom part; then it is appropriate to the Fasten switchgear on the inside of the partition wall.

On the outside, the cover advantageously has a retaining ring for the purpose of covering it for retaining a light diffusion disk. This retaining ring can be attached to the cover in a wide variety of ways: by welding, by screwing in or the like.

Further advantageous refinements of the invention can also be found in the further subclaims.

Based on the drawing, in which an embodiment of the invention is shown, the invention as well as further advantageous refinements and further advantages are explained and described in more detail.

It shows

Fig. 1 is a plan view of a housing according to the invention,

Fig. 2 is a sectional view through the housing

according to FIG. 1 along lines II - II and

Fig. 3 shows a further variant, with which it is to be shown that other components can be used.

4 shows a cross section through a housing, with an inserted lamp,

FIG. 5 shows a cross section similar to that of FIG. 4, with a removable bottom, and FIG

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6 shows a cross section similar to that of FIG. 5, with only one lamp instead of one Switchgear is installed.

It can be seen from Figure 1 that the housing 10 has a substantially rectangular plan; the manual actuators for the electrical switchgear located in the housing are square Blocks 12, 14 and 16 indicated.

From Fig. 2 you can see the housing in detail. The housing consists of a pot-shaped housing part 20 with a bottom part 22 and a housing wall 24 which runs perpendicular to the bottom part 22. The housing part 20 or the housing section 20 is closed with an intermediate wall 26 which is perpendicular to the wall 24 and parallel runs to the bottom part 22. As can be seen from FIG. 2, this intermediate wall 26 has a total of three openings 28, 30 and 32, which have an internal thread 34,

ever
into which / a closure part 36, 38 and 40 is screwed.

The internal thread 34, which cooperates with an external thread on the closure parts 36, 38 and 40, forms with

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a flameproof bushing with appropriate gap widths and gap lengths. Of the three locking parts, the locking part 36 is pulled out for further description. This consists of one cylindrical section 42, which has the external thread, a radially extending bottom section 44

central

and an axially extending / thickening 46, in which a through opening 48 is arranged, which is arranged centrally in the closure part 36. The thickening 46 protrudes on both sides of the bottom section 44 in addition to and inside the cylindrical section there are radially extending ribs 50 for reinforcement of the closure part.

The wall 24 continues beyond the intermediate wall 26 into a projection 52, the free end face of which is a Has extension 54 on the inner circumference of the projection. Through the bottom part 22, the wall 24 and the partition with the screwed-in closure parts 36, 38 and 40 the flameproof space 56 is formed in which three electrical switching devices 58, 60 and 62 are attached or on the bottom part are attached. The switching devices are driven by drive axles or drive rods 64, 66 and 68, which are passed through the through openings 48. By dimensioning the length of the thickening 46 as well as the Distance between the outer surface of the drive rods 64, 66 and 68 and the inner surface of the through openings 48 can have the required gap lengths and gap widths be formed in order to achieve a flameproof implementation.

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The space formed by the protrusion 52 and the is denoted by the reference numeral 70, a space is "increased" security '.' The space 70 is by means of a lid closed, which has a cover section 74 running parallel to the bottom part 22 and a cover section 74 perpendicular thereto has running edge 76, which in the assembled state, as can be seen from FIG. 2, behind the extension 54 engages, the extension 54 serving to center the cover 72. The edge 76 has on its free end face a groove 78 in which a seal 80 is inserted, which is connected to the free end face 82 of the projection 52 cooperates. It can be seen from Fig. 1 that the holder of the cover 72 on the housing part 20 by means of four screws 84 arranged at the corners takes place.

The cover 72 has openings corresponding to the number of openings 28, 30 and 32 in its cover part 74 86, 88 and 90, which are coaxial with the openings 28, 30 and 32 lie. It can be seen from FIG. 2 that the "blocks" 12, 14 and 16 shown in FIG. 1 are inserted into them are, wherein on the blocks cylindrical extensions 92, 94 and 96 are formed, on each of which a External thread 97,98 and 100 is attached. The bracket on the The cover part is then made by means of a nut 104, 106, 108.

The drive rods 64, 66 and 68 reach inside the extensions 96, 94 and 92 where they cooperate with the manual drives in blocks 12, 14 and 16; the drive 12 is a pure pressure drive; the Drive 14 is a lockable with a key 110

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Drive, while the drive of the block 16 a Has rotary switch knob 112, the rotary movement of which is converted into a lifting movement inside the block 16. the The lifting movement can be seen in FIG. 2 in that the drive rods 64, 66 and 68 are on both sides of their Take different positions on the axis of symmetry. This is how the half drawn above indicates the one that is switched off State and the half shown below the switched-on state. The hub is with the letter H denotes. A further detailed description of the transmission facility to be made outside Inward actuation movement is unnecessary since a well-known technique was used here.

The electrical connection lines shown in FIG are not shown, are flameproof Openings led out in a manner known per se, which openings or outlets are indicated at 114.

While FIG. 2 shows a pressure-resistant housing in which only switches are arranged, the shows FIG. 3 shows a cross section corresponding to FIG. 2, in which, instead of a switch, a terminal block 120 in the Housing is arranged. This terminal block is on the bottom part 22 of the housing by means of a standard profile rail attached; Above the terminal block 120 there is a locking part in the same way as with the switches 124, which essentially corresponds to the closure part 36 or or 40; one recognizes that the thickening which is designated here for the sake of clarity with the same reference numeral 46, one of the through openings 48 corresponding opening is missing. Ribs 50 are also provided. In this case, of course, is one of the breakthroughs 86,88 and 90 corresponding opening in the lid,

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which has the reference number 126 here is not required. All other features and details correspond to the case according to FIG. 2.

The particular advantage of this arrangement is that assembly is considerably simplified. In the embodiment of FIG. 2, it is necessary to have a the switch 58, 60 and 62 through the openings 28, 30 or through to the bottom part 22, the Fastening there, e.g. using standard profile rails (e.g. hat profile rails) can be done).

After the electrical switching devices are inserted and fastened and connected, the electrical Connection lines through the feed-through openings 114 such as mentioned flameproof, you have to screw in the locking parts 36, 38 and 40, whereby the space 56 is formed as a pressure-tight space. In the case of the embodiment according to FIG. 3, it is only required, the terminal block 120 on the standard mounting rail 122 put on which standard mounting rail

has been attached by screwing to the bottom part. Then you just have to unscrew the Closure part 124 required and here, too, the pressure-tight space is achieved. The drive rods 64, 66 and 68 protrude through the associated openings 48 outward into the space 70, the projection 52 the free end face of the drive rods 64, 66 and 68 overlaps. After the blocks have been attached to the lid with the manual drive elements, which is done that the cylindrical extensions 94 through the openings 86> 88 and 90 are inserted through and fastened to the cover part 74 by means of the nuts 104, 1o6 and 108, needs only the cover 72 with the attached

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Blocks are placed on the free end face 82, the extension 54 being used for centering; after tightening the nuts or screw connections 84, the housing is fully assembled according to the invention.

It can be seen that the assembly process compared to the known arrangements is made considerably easier and that the number of parts required is reduced.

In Fig. 4 a section can be seen, which is intended to indicate that a lamp in such a Housing can be used. You can see the bottom part and the wall 24 and the partition 26 with the Lid 72 which is fastened on the projection 52.

On the floor 22, inside the pressure-tight space 56 the base 130 of a lamp 134 is attached. The closure part, which in FIG. 4 has the reference number 136 is screwed into opening 138, which corresponds to openings 28, 30 and 32. It owns the Closure member 136 has a collar 140 which attaches to the outer surface the intermediate wall 26 is applied.

The closure part 136 now has an area 142 of enlarged cross section, on the outer surface of which the Thread 144 is attached. Towards the outside, a conical part 146 adjoins, which is converted into a further cylindrical part Part 148 passes over with a cross-section that is reduced compared to the area 142. The inside diameter of the section includes the base 130 of the lamp, while the portion is sized to fit the lamp 134 without there is a risk of excessively high temperatures in this area. The section 148 has a at its free end inwardly facing collar 150 and at a distance

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to this a gradation of 152; at this level there is a transparent double plate 154 on and in the area between the plate 154 and the collar 150 is located a lens-like cover plate 156 which, as can be seen from the .Fig. 4 can be seen, is convex-concave. It can also be seen that the section 148 is formed by an opening 158 corresponding to the openings 86, 88 and 90 protrudes. On the surface of the cover 72, a retaining ring 160 is attached, with the in itself a lens 162 is mounted in a known manner.

It should be noted that the section 142 is screwed into the through-opening 138 or into the thread 142 so that it is flameproof is; furthermore, the disk 156 is also flame proof and held in a pressure-tight manner in the closure part 136. The space between the partition and the lid 72 corresponds to the required safety towards the outside by means of the retaining ring and the lens sealed.

Instead of designing the housing as shown in FIGS Maintaining the remaining areas to make it detachable. In this case, the bottom has the reference numeral 170, the is firmly connected by means of a screw nut connection 172 to the wall 174, which corresponds to the wall 24 in FIG. The partition wall adjoins this wall 74 again; this is given the same reference number as in the Fig. 1 to 4, although the housing is designed differently. The intermediate wall 26 has an internal thread Through-opening 176, the inner diameter of which, however

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in comparison to the through opening 28, 30 or 32 or 138 is made smaller.

The closure part that goes into this threaded hole 176 is used and is designated with 178, has the same task as the closure part 36, 38 or 40: It leads the drive means 180 to a switching device 182 located in the interior of the pressure-tight space in a flameproof manner through.

In contrast to the arrangements according to FIGS. 1 to 4, the switching device 182 is on the partition wall 26 by means Screw-nut connections / fastened. The switching device can of course also be attached to the bottom part 170; only the tolerance problems are greater than if the switching device were attached as in .der FIG.

The other components are the same as those in FIG. 2 and need not be mentioned here any further.

In FIG. 6 shows how a lamp in such a manner can be used as in.der Figure 5 ^the switch. It can be seen again the bottom portion 170 and the wall 174, the intermediate wall adjoins the 26th The closure piece 186 is screwed with a threaded section 188 into the internal thread 176 on the intermediate wall 26, the external diameter of the area 188 corresponding to the external diameter of the closure part 178. Outwardly, the closure part 186 widens into a cylindrical section 190, at the free end of which the collar 150 is again arranged, the step 152 and the disk 156 are arranged at a distance from the collar. At the top or at the outside, the opening 158 is covered or sealed by the ring 160 with the diffusing light disk 162. Inside the flameproof

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Space is on the partition 26 of the base 192 one The lamp 194 is fastened with a seal 196 in between, the lamp 194 in the area 190 Enlarged diameter on the closure part 186 engages.

It can be seen from the above representation that there are a number of possibilities for a flameproof and to form a pressure-resistant housing, a number of components of different designs being inserted into such a housing can be, for example lights, electrical switchgear, terminal strips and the like.

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Claims (1)

Hp.-No. 679/78 December 13, 1978 ZFE / P4-Ft / Ma Expectations Housing for explosion-proof housing electrical switchgear with a flameproof room, anaeqrdnet in which the switching devices / uncl in the drive means of the switching devices and connecting lines to the switching devices are inserted in a flameproof manner, characterized in that the housing to form the pressure-tight space. has a cup-shaped housing part provided with an intermediate wall running parallel to the bottom of the same, that the intermediate wall has openings corresponding to the number of switching devices, which are closed with closure parts optionally provided with through openings through which the drive means are passed in a flame-proof manner. 2. Housing according to claim 1, characterized in that the Versehlußteile in the openings in the partition are screwed in, the thread being dimensioned so that the gap lengths and widths are correct are achieved. ORIGINAL INSPECTED 030027/0166 December 13, 78 - 2 - 679/78 3. Housing according to one of claims 1 or 2, characterized in that the wall of the cup-shaped housing part extends beyond the intermediate wall in continues a projection corresponding to the wall, the projection the closure parts and the drive means towers above, and that the space thus formed can be closed by means of a cover, in which coaxial to the Openings are provided in the partition wall, into which drives can be inserted and fastened, which are connected to the drive means. 4. Housing according to one of claims 1 to 3, characterized in that the lid is also pot-like with a one perpendicular to the one having the openings Surface extending edge is formed, and that the end face of the edge in the assembled state rests against the face of the projection. 5. Housing according to claim 4, characterized in that between the end face of the edge of the lid and the end face of the housing part extensions are provided to achieve a guide. 6. Housing according to claim 5, characterized in that a seal is provided between the end faces. 7. Housing according to claim 6, characterized in that the end face of the edge of the cover has a recess has, in which a sealing compound is inserted. 8. Housing according to one of the preceding claims, characterized in that the closure part has a cylindrical section and at one end of the cylindrical section a radially extending 030027/0168 12/13/78 _ ₃ _ 679/78 28B4028 Section has that the outer surface of the cylindrical portion has a thread with which the closure part can be screwed into one of the openings in the partition is. 9. Housing according to claim 8, characterized in that the radially extending bottom part is an axial Has thickening extending in the direction of the cylinder section, in which the through-openings may be are provided for the flameproof implementation of the drive means. 10. Housing according to claim 9, characterized in that the thickening extends on both sides to the bottom part in the axial direction Direction extends, and that radially extending reinforcing ribs are provided in the interior of the cylindrical portion are. 11. Housing for explosion-proof housing electrical devices in a pressure-tight room, in particular according to one of the preceding claims, characterized in that that at least one of the closure parts is designed so that it at least partially surrounds a lamp, and that the free, outwardly protruding end has a pressure-resistant transparent disk inserted. 12. Housing according to claim 11, characterized in that that the closure part has an inwardly v / ironing collar at its free end and at a distance from this collar has a step on its inner surface, and that the disc is inserted between the gradation and the collar. 030027/0166 12/13/78 _ 4 - 579/78 13. Housing according to claim 11 or 12, characterized characterized in that the closure part by an öf5Μ ^ £ ρ / |. Q 2 protrudes in the lid and that the opening with the closure part of a retaining ring for.eine dispersion disc or Diffusing screen is surrounded and covered. 14. Housing for explosion-proof housing electrical switching devices according to one of the preceding claims, characterized in that the bottom of the pot-shaped, the pressure-tight space closing the housing part is releasably attached to the wall, and that the switching devices or the lamp is attached to the partition. 030027/0166 ORIGINAL INSPECTED