DE202006009812U1 - Explosion protection fitting for lamps illuminating e.g. oil platforms or gas tanks, from which cover is not readily removed, includes lengthy protection assembly completed by cover and covering sections - Google Patents

Abstract

A lengthy protection assembly is provided. The first part of its length is fitted in the covering (20). The second part of its length is fitted in a cover (26). The cover has a circumferential groove (42). The covering includes a bore corresponding with the groove (or vice versa). The protection is partially seated in the groove and partly in the bore, in a locking position. The protection is at an acute- or an obtuse angle to the longitudinal axis (32) of the light or cover thread. It preferably occupies a common plane with the longitudinal axis of the light. The method of securing and protection, is a grub screw. It is accessible at the outer circumference of the covering. Cover and covering are connected by an electrical cable. The covering has a connection for the cable. This is positioned such that the cable can be guided by the protection. The cover outer thread screws into an internal thread (36) of the covering. These components each have radial surfaces resting against each other, when screwed together. There is a triangular seal channel in the covering, between the internal thread and resting surface. This accommodates an O-ring. In the hollow body (11) a metal backing sheet (12) forms the mounting for the lamp and associated components. One end is bent down to form an endwall (54). A cover projection (55) enters a corresponding opening in the endwall. The cover structure is further detailed. A seal is included between cover and covering. The covering has a surrounding groove near its opening (25), the wall forming the free end of the hollow body is inserted into this, together with a casting mass. There is greater spacing between the hollow body and the groove outer wall, than between it and the groove inner wall.

Description

The The invention relates to a light with explosion protection, with a at least one side an opening having hollow body for admission to one or more lamps and with a particular sleeve-shaped cover, which is arranged on the hollow body Öftnung, wherein the cover has at least two openings has, namely a corresponding to the hollow body opening first cover opening and a second cover opening closed by a lid, and wherein a securing means against a quick release of the lid is provided.

to shine with the identifier "Ex" are for use in potentially explosive atmosphere Envisioned and come for example on drilling platforms or gas tankers used. In an explosion inside the Luminaire allowed no explosion sparks to the outside escape. As a hollow body can a tube be provided, which at both ends by suitable means or Covers is closed. At least at one end, the cover with Cover provided. These parts are designed so that at one Explosion will prevent the escape of explosive sparks. The Construction of the transition between the hollow body and the respective cover on at least one end is for compressive strength the light of great Importance. Analogously, this applies to the connection between cover and lid. The lid is against unintentional opening to secure.

In the present case, in particular luminaires with explosion-proof encapsulation according to the European standards EN 50014/50018 - luminaires of the type "E Ex d" - and preferably in connection with the use of "II B" and the degree of protection IP54 or IP67 are addressed, see also EP 1 253 375 A2 , Inside the lamp preferably a fluorescent lamp is provided, for. B. a lamp with 18 watts and for 230 volts / 50 heart. Inside the lamp holding means, leads, a ballast and capacitors are also arranged.

to Securing the lid on the cover is the lamp according to the invention characterized in that an elongate securing means provided which is with a first part of its length in the cover and with a second part of its length inserted in the lid. The securing means is the same Aligned that movement of the lid away from the cover (Lifting the lid) by the inserted securing means difficult or prevented. Preferably, the lid is with a thread rotatably held in or on the cover, so that to release the Lids a rotational movement is required. It moves the Cover automatically according to the pitch of the thread of the Cover away. The securing means impedes or prevents ever according to location and orientation, the rotational movement and / or said other movement, which preferably in relation to the hollow body and the cover thread is axially directed.

To Another idea of the invention is that the lid having a circumferentially extending groove, and that the cover provided with a groove corresponding to the bore is, or vice versa, wherein the securing means in a locking position, at least partially seated in the groove and at least partially in the bore. The groove for receiving the securing means extends over a Full circle (endless) or just over a part of it. In the latter case results automatically at the end of the groove a lock against a lid rotation. Also a complete one circumferential groove cooperates with the securing means together by suitable Undercuts of the groove walls. These are aligned the movement of the lid away from the cover is made more difficult, for example as mentioned above the axial lid movement when unscrewing the lid from the Cover.

advantageously, the securing means is at a sharp or obtuse angle to a luminaire longitudinal axis or cover thread longitudinal axis directed, preferably in a common plane with the longitudinal axis. Preferred is an embodiment at the lights longitudinal axis with the lid thread longitudinal axis flees. By the abge angled arrangement of the elongated securing means results in a particularly good backup of the lid on or in the cover. In particular, this applies in conjunction with a groove for receiving the securing means, wherein the groove is also under an angle to the longitudinal axis is aligned. A circumferential groove or its walls spans then by their angled orientation a funnel or a Cone on.

To Another aspect of the invention is the securing means around a grub screw. This preferably has an Allen head on. While the cover is releasable without securing means by simply twisting it off, deactivation of the securing means requires a special tool, namely an Allen key.

According to a further aspect of the invention, the securing means is preferably accessible only on the outer circumference of the cover. The securing means is preferably directed away from the cover and / or inserted at an angle in the outer periphery of the cover. Thus, even from the direction of access to the securing means results in an additional step for the user and thus greater security against thoughtless action.

To Another idea of the invention is cover and cover connected by a particular electrical cable. Preferably Both lid and cover are made of metal. The electric Cable prevents a potential difference. Through the cable is also the Cover secured to the cover. Preferably, the cable is outside on the Cover and attached to the lid with screws and cable lugs.

To In another aspect of the invention, the cover has a Connection for the cable, which is positioned so that the cable over the Guided backup is over, in particular the Allen grub screw. First, the user can use the Cable seize the position of the securing means. On the other hand the cable must be pushed aside to get access to the security.

advantageously, is the safety device outside, in particular radially outside a provided between the lid and cover sealant arranged. The securing means can be formed even without a sealing function be.

To In another aspect of the invention, the lid has an external thread on, which is inserted into an internal thread of the cover. In addition, show Cover and cover substantially radially directed contact surfaces, which rest against one another in particular when the lid is screwed in. This will one as possible intimate and tight connection between cover and cover achieved.

advantageously, is used as a sealant in the range of an angle between external threads the lid and its contact surface provided a circumferential seal, in particular a sealing ring.

To Another aspect of the invention, the cover in the area the transition between Internal thread and contact surface a bevel on, to form a sealing channel with triangular, rectangular (isosceles) cross section. This will be two sides of the triangular Cross-section formed by the lid, namely by the angle between external thread and contact surface. The circumferential seal or the sealing ring is relative to the cross section of the sealing channel dimensioned so that when fully tightened or in the cover inserted lid is deformed and the sealing channel almost complete fills. contact surfaces Lid and cover lying together.

To Another idea of the invention is in the hollow body Mounting plate arranged for receiving in particular electrical components. there the mounting plate extends to the lid and is Angled on the cover forming a transverse to the longitudinal axis the lamp directed end wall. In addition, the lid has a axially directed projection, which in a corresponding Recess in the front wall occurs. Projection of the lid and recess the front wall are matched to each other or just fit into each other, so that as possible gives little play or a play-free stop is given.

To Another idea of the invention, the lid on the projection a receded one Paragraph with a radially adjacent to the paragraph, open in the axial direction Groove on. Furthermore the end wall is partially on the shoulder and partially axially the groove. Paragraph and groove extend in particular circumferentially on Cover. The described design is the transition the end wall to the adjacent axially directed part of the mounting plate in front of the groove, leaving the front wall slightly when inserting the lid (resilient) can give and with appropriate dimensions of the Mounting plate this is fixed without play through the lid.

To Another idea of the invention is that the cover around her first cover opening around a circumferential groove into which a free circumferential Edge of a circumferential hollow body wall is used. In this case, the circumferential groove outer wall, Inner wall and floor area on. Advantageously, the free edge of the hollow body with Potting compound inserted into the groove, wherein between the hollow body wall and groove outer wall a greater distance exists as between the hollow body wall and groove inner wall. Preferably, outer wall and inner wall of the groove extend parallel to each other and across the floor surface. An end face of the circumferential edge then comes to the bottom surface of the groove to the plant. By the dimensions described are in the area between the hollow body wall and groove outer wall about 50 to 100% more potting compound available between the hollow body wall and groove inner wall. this makes possible an elastic and yet precise storage of the hollow body in the groove of the cover.

All features are claimed in combination with each other or alone or in conjunction with the preamble of claim 1. In particular, this applies to the arrangement of the elongated securing means, the cable for connecting the cover and cover, the circumferential seal between the cover and cover, the mounting of the Monatageblechs on the lid and the special Arrangement of the hollow body in the groove of the cover.

Further Features of the invention will become apparent from the description of the remainder and from the claims. Preferred embodiments The invention will be explained in more detail with reference to drawings. It demonstrate:

1 an exploded view of a lamp according to the invention,

2 one end of the luminaire according to the invention, with cover and lid,

3 the end of the luminaire according to 2 but from a slightly different angle and without a lid,

4 the end of the luminaire according to 2 but in longitudinal section,

5 the end of the luminaire according to 2 but from a slightly different angle and with the cover lifted off the cover,

6 the end of the luminaire according to 2 , but in the bottom view.

In the lamp according to the invention shown in FIGS 10 it is an E Ex d long-field luminaire according to EN standards 50014 and 50018 as well as 50019. In a tubular hollow body 11 - a clear-transparent polycarbonate cylinder - is a mounting plate 12 with ballast 13 , Capacitor 14 , electrical terminals 15 , Lampholders 16 . 17 and rod-shaped fluorescent lamp 18 accommodated.

The hollow body 11 is from two covers 19 . 20 closed, which are made of metal, in particular die-cast aluminum. The covers 19 . 20 are outside the hollow body 11 by two opposing tie rods 21 connected with each other. For this purpose, have the covers 19 . 20 two eyes on each outer circumference 22 respectively. 23 on. The tie rods 21 are in the eye 23 the cover 20 screwed in, glued or otherwise secured and become in the eyes 22 the cover 19 through nuts 24 held and excited.

The cover 19 closes the hollow body 11 at the associated end of the same completely. In contrast, the cover 20 sleeve-shaped, with a hollow body 11 facing opening 25 and an opposite thereto, from a lid 26 closed opening 27 , The lid 26 is made of metal, in particular die-cast aluminum.

The covers 19 . 20 have on their outer circumference - approximately in the middle between the eyes 22 respectively. 23 one eye each 28 . 29 for fixing an angle 30 (which can be hinged) for the arrangement of the lamp 10 on a building or ship wall, a carrier or the like.

The lid 26 is designed in a special way and on the cover 20 secured. For this purpose, the lid 26 a circumferential collar 31 with a relative to a luminaire longitudinal axis 32 radially directed contact surface 33 at a corresponding contact surface 34 the cover 20 is applied.

The lid 26 is with an external thread 35 provided, which in a corresponding internal thread 36 the cover 20 is used.

On the outer circumference of the cover 20 is a hexagon socket screw as securing means 37 screwed. A corresponding hole 38 in the cover 20 runs at an acute angle to the longitudinal axis 32 from the outer circumference of the cover 20 through the contact surface 34 therethrough. The oblique bore 38 is divided into two sections, a first and adjacent to the outer circumference section 39a and a second and to the contact surface 34 adjacent section 39b , which with a thread for the grub screw 37 is provided. The section 39b indicates a paragraph 40 a smaller outer diameter than the first section 39a the bore 38 , With a corresponding design of the grub screw 37 this is just as far in the cover 20 screwed in until a corresponding paragraph (the grub screw) on the paragraph 40 as well as in 4 is shown.

The grub screw 37 protrudes with a short length section 41 over the contact surface 34 out or in the lid 26 into it. To make this possible, the lid points 26 a circumferential groove 42 on. The latter is not parallel to the longitudinal axis 32 in the lid 26 introduced, but - according to the arrangement of the grub screw 37 - At an acute angle of, in particular 20 ° to 45 ° to the longitudinal axis 32 , In the present embodiment, the groove extends 42 in the circumferential direction over 360 °. Alternatively, shorter groove sections may also be provided, for example over 180 ° or less.

Dimensioning and alignment of the groove 42 on the one hand and the grub screw 37 on the other hand, are coordinated so that when inserted into the cover 20 lid 26 and screwed grub screw 37 the lid 26 at most only slightly rotated, but can not be removed. In this case, blocking has a blocking effect inner undercut 43 the groove 42 , The grub screw 37 comes with a free end of the section 41 at the undercut 43 lie form fit, so that a movement of the lid is limited in the axial direction. Preferably, the grub screw at its free end of the section 41 no thread on, leaving a tight fit in the groove 42 is possible. The undercut 43 is at the same time the inner wall of the groove 42 ,

The lid 26 is with the cover 20 via a preferably electrical cable 44 connected. This is over a cable lug 45 in the region of the longitudinal axis 32 outside with the lid 26 screwed. A cable lug 46 is on the outer circumference of the cover 20 screwed and axially before the grub screw 37 so the cable 44 over the grub screw 37 is carried away.

In the area of the transition between contact surface 34 and internal thread 35 or contact surface 33 and external thread 36 is for sealing between cover 20 and lid 26 a sealing ring 47 used. To accommodate this, the cover has in the region of the transition between the contact surface 33 and the internal thread 35 a chamfer, so that a small channel is formed with a substantially triangular cross section, in which the sealing ring 47 lies. The channel is dimensioned so that the sealing ring 47 in the cover 20 screwed lid 26 elastically deformed, at the bevel and on the lid 26 abuts and so optimally seals.

A special feature still exists in the arrangement of the grub screw 37 relative to the sealing ring 47 , The grub screw acting as securing means 37 is regarding the sealing of the interior of the luminaire 10 arranged outside the seal and therefore does not have to act self-sealing.

The lid 26 is at its free, the cover 20 opposite side with a hexagon 48 provided to tighten the lid 26 to allow with a suitable wrench.

The cover 20 has at its outer periphery unspecified cable sleeves and bushings 49 which can be closed or equipped as needed. In a special way, the mounting plate 12 between cover 19 and lid 26 held. In a manner not shown is a free end 50 of the mounting plate 12 in an inside arranged recording of the cover 19 inserted, so that in this area no Queraxialen movements are possible.

For stabilization is the mounting plate 12 forming longitudinal side walls 51 . 52 each folded by about 90 °. Besides, at one end 50 opposite end 53 by a 90 ° -Kantung an end wall 54 educated.

cover 26 and front wall 54 are designed in a special way to the mounting plate 12 clearance-free and springy storage. For this purpose, the lid 26 centrally a rod-shaped projection 55 on, the diameter of a recess or bore 56 in the front wall 54 is adjusted.

Starting from the external thread 35 of the lid 26 extends a radially directed surface 57 to the projection 55 approach. In the area 57 let in is a circumferential groove 58 a little distance to the projection 55 has, so that between groove 58 and lead 55 a paragraph 59 is formed. The front wall 54 sits backlash on the lead 54 and lies on the heel 59 at.

The groove 58 is so wide in the radial direction that it comes from the front wall 59 just not covered. Accordingly, the mounting plate 12 easy in the groove 58 compress under deformation of the end wall 54 , The length of the mounting plate 12 is relative to the available space between the two covers 19 . 20 so chosen that the front wall 54 with the lid closed 26 just slightly deformed and therefore the mounting plate 12 inside the lamp 10 is held backlash-free in the axial direction and free of play in the radial direction.

To achieve the desired degree of protection IP54 or IP67 is the hollow body 11 in a special way with the covers 19 . 20 connected or embedded in the same. Both covers 19 . 20 have circumferential and axially open grooves. Shown is only the groove 60 in the cover 20 ,

A free circumferential border 61 a circumferential wall 62 of the cylindrical hollow body 11 is in the groove 60 used and is located on a bottom wall 63 the same. inner wall 64 and outer wall 65 the groove 60 have a greater distance from each other, than this due to the wall thickness of the wall 62 would be required. The not from the wall 62 filled space in the groove 60 is occupied by a sealing potting compound based on polymethanes, which has a high thermal conductivity, good low-temperature flexibility, high continuous temperature resistance and a good thermal cycling in the range of -40 ° C to + 150 ° C. It is between the outer wall 65 and the wall 62 about 50 to 100% more potting compound than between the wall 62 and the inner wall 64 , With sufficient flexibility and elasticity of the wall 62 or of the hollow body 11 in the covers 19 . 20 Nevertheless, a precise storage and alignment is given.

10

lamp

11

hollow body

12

mounting plate

13

ballast

14

capacitor

15

electrical clamp

16

lamp socket

17

lamp socket

18

lamp

19

cover

20

cover

21

drawbars

22

eyes

23

eyes

24

mother

25

opening

26

cover

27

opening

28

eye

29

eye

30

angle

31

collar

32

longitudinal axis

33

contact surface

34

contact surface

35

external thread

36

inner thread

37

grub screw

38

drilling

39a

section

39b

section

40

paragraph

41

section

42

groove

43

undercut

44

electrical electric wire

45

lug

46

lug

47

seal

48

hexagon

49

Grommet

50

free The End

51

long sides

52

long sides

53

The End

54

bulkhead

55

head Start

56

drilling

57

area

58

groove

59

paragraph

60

groove

61

free edge

62

wall

63

bottom wall

64

inner wall

65

outer wall

Claims (15)

Lamp ( 10 ) with explosion protection, with an opening at least on one side ( 27 ) having hollow body ( 11 ) for receiving one or more lamps and with a particular sleeve-shaped cover ( 20 ), which on the hollow body opening ( 27 ) is arranged, wherein the cover ( 20 ) has at least two openings, namely one to the hollow body opening ( 27 ) corresponding first cover opening ( 25 ) and one of a lid ( 26 ) closed second cover opening, and wherein a securing means against a rapid release of the lid ( 26 ) is provided, characterized in that an elongate securing means is provided, which with a first part of its length in the cover ( 20 ) and with a second part of its length in the lid ( 26 ) is used. Luminaire according to claim 1, characterized in that the lid ( 26 ) a circumferentially extending groove ( 42 ), and that the cover ( 20 ) with a groove ( 42 ) corresponding bore ( 38 ), or vice versa, wherein the securing means in a locking position at least partially in the groove ( 42 ) and at least partially in the bore ( 38 ) sits. Luminaire according to claim 1 or 2, characterized in that the securing means at an acute or obtuse angle to a lamp longitudinal axis ( 32 ) or cover thread longitudinal axis is directed, preferably in a common plane with the lamp longitudinal axis ( 32 ). Luminaire according to claim 1 or one of the further claims, characterized in that the securing means a grub screw ( 37 ). Luminaire according to claim 1 or one of the further claims, characterized in that the securing means on the outer periphery of the cover ( 20 ) is accessible. Luminaire according to claim 1 or one of the further claims, in particular according to the preamble of claim 1, characterized in that cover ( 26 ) and cover ( 20 ) by a particular electrical cable ( 44 ) are interconnected. Luminaire according to claim 6, characterized in that the cover ( 20 ) a connection for the cable ( 44 ) which is positioned so that the cable ( 44 ) is guided over the securing means. Luminaire according to claim 1 or one of the further claims, in particular according to the Oberbe handle of claim 1, characterized in that the lid ( 26 ) an external thread ( 35 ), which in an internal thread ( 36 ) of the cover ( 20 ) and that cover ( 20 ) and lid ( 26 ) substantially radially directed contact surfaces ( 33 . 34 ), which with screwed cover ( 26 ) in particular abut each other. Luminaire according to claim 8, characterized in that in the region of an angle between external thread ( 35 ) of the lid ( 26 ) and its contact surface ( 33 ) a circumferential seal is provided, in particular a sealing ring ( 47 ). Luminaire according to claim 9, characterized in that the cover ( 20 ) in the region of the transition between internal threads ( 36 ) and contact surface ( 34 ) has a chamfer, to form a sealing channel with triangular cross-section. Luminaire according to claim 1 or one of the further claims, in particular according to the preamble of claim 1, characterized in that in the hollow body ( 11 ) a mounting plate ( 12 ) is arranged for receiving electrical components that the mounting plate ( 12 ) to the lid ( 26 ) and is angled on the cover to form a transverse to the longitudinal axis ( 32 ) of the luminaire facing end wall ( 54 ), and that the lid ( 26 ) an axially directed projection ( 55 ), which in a corresponding recess in the end wall ( 54 ) occurs. Luminaire according to claim 11, characterized in that the lid ( 26 ) on the lead ( 55 ) a deferred paragraph ( 59 ) with a radially outwardly adjoining the shoulder, axially directed groove ( 58 ), and that the end wall ( 54 ) partly on the paragraph ( 59 ) and partially axially in front of the groove ( 58 ) lies. Luminaire according to claim 1 or one of the further claims, characterized in that the securing means outside, in particular radially outside of a between lid ( 26 ) and cover ( 20 ) is arranged arranged sealing means. Luminaire according to claim 1 or one of the further claims, in particular according to the preamble of claim 1, characterized in that the cover ( 20 ) around its first cover opening ( 25 ) around a circumferential groove ( 60 ) into which a free circumferential edge ( 61 ) a circumferential hollow body wall ( 62 ) is used. Luminaire according to claim 14, characterized in that the free edge ( 61 ) of the hollow body with potting compound in the groove ( 60 ) is inserted, wherein between the hollow body wall ( 62 ) and groove outer wall ( 65 ) is a greater distance than between the hollow body wall ( 62 ) and groove inner wall ( 64 ).