HUE034695T2

HUE034695T2 - Fire-resistant housing for a frequency converter

Info

Publication number: HUE034695T2
Application number: HUE11182275A
Authority: HU
Inventors: Christian Daemon; Daniel Dr Prostrednik; Stefan Steininger
Original assignee: Siemens Ag Oesterreich
Priority date: 2010-09-28
Filing date: 2011-09-22
Publication date: 2018-02-28
Also published as: EP2433676B1; DK2433676T3; SI2433676T1; PT2433676T; PL2433676T3; EP2433676A3; ES2628871T3; EP2433676A2

Description

TuaaM hsa iramatalakitoima Fire-resistant housing for a frequency converter technical area:

The present invention relates to a fire-resistant housing for a frequency converter, in particular for a frequency converter of a rail vehicle, wherein the housing is manufactured from a a heat insulation part made of a non- flammable material which is arranged on a housing part of the housing on an outer wall surface:,: In order, in the event of a fire m the Interior space; to; attenuate the heat flow into an adjacent exterior space.

Prior art

It Is known that power electronic components of a ffeqaohcy converter aha usually housed in a metal housing which in addition to mechanical protection also forms a shield for electromagnetic radiation. The metallic structure Is a good heat conductor for the power loss accruing in the inferior space.

This good thermal conductivity is a disadvantage when if comes to keeping an adjacent external escape1 route passable for as long as possible in the event of a fife in the Interior space of the: frequency converter housing. For safety reasons; it increasingly a: requirement for rail vehicles that in the event of a frequency converter fire the metallic structure facing the exterior space only undergoes a i-mlted temperature Increase. These requirements differ depending on the risk class of the rati vehicle. The requirements for yehlcierwhfCh um-Mt»q#ititan for trams. In Germany, the German national Standard Op $5X0 determines which limit values apply. A rail vehicle, for example; may be required to have a housing for high performance components in the interior space which is embodied such that no gap or openings or persistent flames can; arise on the outside of the housing for ItisxfMsum; pr^cMtiw «apo· corridor hut; also; prevents the spread of fire in the; evacuation phase.

As is well known:; there are tight space; constraints in a rail vehicle, e.g. in the traction unit of an electric locomotive, Heat development in the intenor space of a rail frequency .eoidid&rabie,. tewtfety resuitlnd M tne fire resistance r^dlfeipeatSi fe the frecjuene^ hehvetfei' housing being increasingly stringent for safety reasons,:: THfe applies not only to frequency conveners which are arranged in the interior space m a rail vehicle:* out also to those assembled under fhedfedD In the case of which toe heating of anesoape route above should he delayed for as long as possible and: the spread or fire prevented,

Pite protection is known from TF1 BM Mm which a protective wail Is coated with an intumescent, in other words material, in the event of a fire., the flexihie sheet msterisi swells. Expansion may be several 1®0% and forms a barrier to the heat how. In the ease of a frequency converter,, however* the temperatures occurring in the inferior space in the event of a fire may be so high that an: inthmescehf coaling alone is Insufficient to keep an adjacent escape route passable.

In the coarse of oehstantiy growing safety awareness, fire regulations are becoming stricter. M aresult, not only is the permissible surface temperature of the frequency converter housing reduced but the standard also prescribes the durability of the protective measure for a rail vehicle whichmustremain fenctiohai for more than 20 years C^ermah industry standard DIN SO 3.5S), In addition, there is the desire on the part of the operator of a rail vehicle to avoid protective measures requiring any expensive maintenance for the maximum possible operating time.

Description of the invention

The object of the present invention is fb: provide a fire-resistant housing for a frequency converter which, in the event Pf a fire inside the housing* better isolates the,heat flow through a housing part lh an adjacent safety-critical exterior space and for Which this isoiation effect remains as maintenance-free as possible for the maximum operating time possible.

This object is achieved by a fire-resistant frequency converter with the features of claim I: , Jtdvahta|eous emfmdimenfs of the invention are- deified; JiHte ddpgpitgf claims,

Mcording to the invention, the object is achieved^ that & fHH&Jfc provided which its connected both by means of a substance-fcofeuhstaocerbond as Wei! as by means of a form-fit connection tothe housing part which adjoins a safety-critical exterior space, in other words, according to the invention the heat insulation part is therefore fastened its ppar^ m two Ways: on the one hand, it is bonded to it; on the other hand, it is held on the support by ntnsn& of |re-resistsr5t of retention. Tire housing p&mmn he a door part or iii; pdft or o side part, but cm-'^m comprise venous housing component parts, hrlichoo adhsaive; bonding respitfjn the heat insulation part adhering extensively to its support during normal operation, so other words without exposure to fire. As a result, impact loads which operate throughout the entire operating period of the tali vehicle can he absorbed by a large surface. The mechanical means of retehtioh have tea efted during normal operation as a result and con therefore he less developed* In the event of shocks, areas of the heat insulation part in the region of the mechanical retainers are subject to less stress, This is favourable for the service life of the connection, in the event of fice, onths other hand, where the adhesive hood may come loose as a result of the effect of heat, the fire-resistant means of retention ensure that the heat insulato on the housing part when the support begins to deform on account of the effect of heat. This increases the stability of heal iosuiation. As a result, the function of the measure to delay the passage of heat remains effective over a longer period. The burning interior space is better thermally Isolated from an adjacent exterior space. Due to the better isolated temperature, an escape route which passes a frequency converter in a machine room of a rail vehicle can be passed unharmed by the fleeing vehicle driver for longer In an emergency. The escape route is not blocked by protruding parts of the heat insulation, The heat insulation attached to the outer wali surface also mas the advantage that for maintenance-purposes cheeking from outside by means of visual inspection Is easily possible witho:ut;?h§yi.ng'ld'::Spbrt-®'l:id: part. The attachment of the heat insulation part to: the externSh^aff'ibflfeSi'hPtiaing by means of mechanigaf fastenlng elements is robust and a|most::maintenance'l:ree m ns effect over a long operating period. Assembly on the outside of the housing has the further advantage that the interior space of the frequency converter housing, which as a rule is a clears room, is not contaminated by parts of the insulation material being detached, in princlpib, all insulation materials which, in case of fire, ate suite hie for forming a sufficiently large barrier for the heat flow coming from the interior space are eligible for the heat insulation part. it Is particularly advantageous if the outer wall surface of the housing part is completely covered: with a layer of adhesive:, As a result, the vibrations occurring during operation of the rati vehicle aresssentially absorbed by the adhesive layer and excessive mechanical stress on the heat insulation part is avoided. This Iqofeasosithofddfohillty-oiilhil-heat insulation, A ptefeh-ed. embodiment provides: that the forbhit cobneetibd is farmed by: a: phlfalliy of connectors, wherein each cormaetor iseadaeeted by one and to the hpusfngspartand by another ead: ss Jdsartad through a threaghfeole In the beat: msolation pari* wherein fbe; Inserted end engages behind the hast insulation part by means of a retaining part In the event of a fire, the escape corridor Is freeiy pessabie and apt blocked by protruding heat, insulation parts.

Cost-effectively, the connectors can be designed as screw belts, or aiso as retaining straps which are folded or caul feed at their Inserted end, The connectors may also consist of en Insulator. The retaining part may, for example, beformed: by a washer, or a perforated plate:, a grid, a steel mesh, an expanded metal mesh which is pulled apart, or another piate with recesses.

The heat Insuiation part is preferably made of a web of a mineral material, e,g. a mineral or rock wool which as, for example, laminated with an aluminium layer, The low weight of these mineral wehs Is psrtlCdlafly advantageous for a rail vehicle,

Alternatively, a td'iib&f' alto be such that the heatinsuiahoh part is formed by a commercially available fire protection piate on a cement base, e.g, of calclum slileafe or plasterboard and/or mineral ife reboard.

Fartlchlarly good heat ihsoibbotv Is achieved when the beat insulation part extends beyond the frame of the frequency converter bousing, in other words, when viewed in the direction of the interior space of the cabinet body, the beat insulation part is greater and so overlaps It at the edges. The resuit of this is that the beat emitted by the metal frame Is also kept away from: the adjacent escape route and the spread of fire Is delayed. A particularly preferred embodiment may' he characterised in that the housing part is coated on an inner wall surface facing the interior space with an intumescont coating known per se. This inturnescent coating foams in the event of a fire, as a result of which an additional heat barrier is formed. In the event: of a fire, the metallic structure beats up later. Even if this effect Is only of a comparatively short duration, the usefui life of the escape route is extended. Such an Inturnescent coating may, for example, be a formulation containing exfoliated graphite.

In order to: prevent the escape of hpf fFdas from the inferior space of the fregoeocy converter housing in the event of a Ire, a preferred embodiment can provide that an ,6.r m m%4kmm the &rmedbif%i.

Inner waif sM^«-olthe:%usii«i(i!::pift and: the opposite end fate bflhe frame, Od: either δ® and/or $h& Pthe? -fdrwwpi.0; lititSi ·$$η· he done in such: a: way that the ioturoesceot coating agpied to the inner wall surface of the housing part is extended into the gap.

If is favourable if this ihtamesceof coating: Is ypipforced, far example, with metaffthres:, glass fibre or strands of carbon fibres or the like.

It may in turn he advantageous if this reinforcement is extended into the gap between the lid part and the frame part as this imp roves Abe sealing effect in the event of a fire > A.&f^H^rlfihprPveJiiepfcPf'the physical harrier can also beiachievad by likewise coating: the end face of the frame facing the housing part with an intumescent coating. Having a coating on both gap surfaces is particularly effective in preventing the escape of hot flue gases in the event of a fire.

In a particufariy preferred embodiment of the invention, the interior space of the cabinet body is divided into individual partial spaces by means of abrasion-fhee iosuiation plates. As these partial spaces present m lower hazard potential, the fire protection reguirements are reduced.

As a fesuib a fidiprf which covers these partial spaces as far as the escape corridor dan he formed: with thinner insulation:,

Preferably the thickness; of the Insulation part is approximately 0.5 cm to 3 cm.

It can also bo advantageous if the fire-resistant connection part Is made of m insulator. As a result, in the event of a fire, the heat flow by way of the means of retention is also prevented, A ceramic, glass or porcelain part is suitable, for example.

Brief descr-ption of the drawing

To ftfrther explain the invention in the following part of the d^criptlbd^Mr!ab:eO';:(S:'.hiadg;: to the drawings from which further advantageous embodiments:, details and developments of the invention can be takers with reference to the unresirlctive exemplary embodiment shown., fp fhe drawings:

Figure: :¾shows a relway mbicWm a top view, ip which two betwoerr which there is an escape corridor are arranged in a spend ndjacent to the drivers cab;

Figure 1 shews 3 ftityMMCgf converter m a rail vehicle of which a housing part likewise herders on ®n adjacent escape route, wherein according; to a particular embodiment of the invention, the interior spaceof thefrequency converter housing is t ivsded into pamo! spaces by means of insulation plates;

Figure I shews a detailed description of the housing part of the frequency converter housing; which snows the fastening according to the Invention of the heat insulation part; Figure 4 shows a detailed description of 'the housing lid part in the area of the frame of the frequency converter housing, wherein the seal in the gap between the lld part and the frame is shown.

Execution of the invention

Figure i shows a top view of the arrangement of two frequency converters at the front of a raii vehicle 14.. A route passes betweenthe two housings 1, providing access to the drivers cab .1.5. In an emergency, for exampie, in the event of a fire, this route is simuitaneously the escape route for people in the driver's cab- In the event of a fire inside a frequency converter housing 3, the heat exposure of people using the escape rppte 13 most he kept so low, at least for a time, that they cab use the :Cprndor to reach the passenger area .16 unharmed.

Both frequency converters 1 are in a space demarcated both in terms of the driver's cab IS, and aiso in terms of the passenger area 16, in each case by a wall 17, IS with doors which meet the physical barrier and/or heat insulation criterion ’Έ115".

As aforementioned, in the event of a ire the escape corridor IS must he passable for as long as possihie. This Is accomplished by providing at least the housing parts 12 adjacent to the exterior space 13 - in this case ιβρίΐίΛι frequency converter housing ™ with heat insuiohon according: to the Invention.

Figure 2 shows in a spatias representation a static, self-supporting cuboid frequency converter housing 1 which is arranged in a carriage of a rail vehicle 14, Here too, a ito#§g.pift M:P Hd pert of the housing frame - borders on a seMy-cftiea! escape chute U. fh the event of a fire in the interior space 11. of the frequency converter housiny :1., this escape route 13 shouid remain passable for passengers from the passenger are® 16 for as teng as: possible, without these people coming: to any harm on account of the heat emitted by the housing part it, to the illustration of Figure 2 dotted lines indicate that the inferior space 11 of the frequency converter is divided: into: individual partial space® !i‘ by means of insulation plates l:E.:1%ii'iihsyfef'tot the Hr# protection requirements are reduced because of the lower volume, enaPI 1 ng the insulation of the housing lid 12 to: he correspondingly thinner.

Figure 3. shows a sectional detail view of the fasten mg of the: heat insulation: pert: 4 on the housing part 12, An adhesive: layer 2 forms an: adhesive bond 20: with the moral wall 12 on the one hand, and with the insulation part 4 on the other hand:. In addition to this su bsta nee - to - su b sta n ce bond 20, the beat insulation part 4 is fastened by means of a number of fastening eiemoots 6 distributed on the: ou ter waif surface: 22 in each case by means of form-fit eormechpa 21. This form-fit: connection 21: isrflrevreslstant. In other words it is designed such that, even in the event of a fire, l:f the adhesive bond 20: separates from the interior space i l of the: frequency converter housing: l because of heat exposure, if retains· the heat insulation part 4: Iw connection with the: outer wall surface 22 of the housing part 12, In the present example this consists in each case of a metafile: bolt, one end 9 of which is welded to the housing part 12 and the other end: 8: of which is inserted in a through-hole 7 in the heat insulation pert 4. This inserted end: i has a thread, By means of e washer 5 made of metal and ® threaded nut 6, in the event of a; fire the heat insulation part 4 Is else kept attached to the housing part 12: scr that even in the event of exposure: to: great: heat, the iMuleting effect Is not impaired: by the separation of the heat insulation part 4 from the housing wail 12.

In the exemplary embodiment shown, the heat insulatlorv part # is a hre protection plate on a cement base which, even in the event Of a fire, is: kept in connection with the outer wall surface 22 by means of the connectors 3. However, the: beat insulation part 4 can also be made of another insulation material such as, for example, a mineral web, a minerai wool or a rock woo! which, for example, is laminated with an aluminium layer, fp such an embodiment, it is appropriate for the retaining part i to bo fiat, for example embodied: as a metal sheet with: recesses, or as a wire mesh, grid, expanded metaiy perforated plate, or the like.

Naturally, the detachable nut and bolt connection shown In the present exemplary: embodiment can also be a permanent connection:, for example: by means of a retaining part snapped onto the connectors 3 using a snap-on cofmectiom figure» 4 showsa sectional detail mm Ofa pafticuisfiy of the invention, A section of the closure at the edge of the body is shewn. The heat insulation part 4 IS. ·~ W ifemmdhidhid ~ fastened to the housing part 12 by means of an adhesive bond#0 and &pubandffepit^onrisctidpi$>. Atthe odadi the housing part'll: :ie foldedtirutne shape of a "U'h the housing part 12 extends over the end Idee 27 of the fm«: lit Mb. M'WSSdan.i'ddatltip' 24 & applied to the surface 2¾ facing the interior spaee 113,, This epatlng; Id also extends into the gap 2$:which is formed between: the surfaces 23 and 27, Itihdi: d relnfdroepvenf: IP, In iheipyeht of a fire, the volume of the coating 24 is increased because M the heat exposure from the Interior space 1.1, As a^result, the gap 25 Is dlosM: by the intutnesceht material 24, at least when the fire starts, Hot iue gases are prevented from reaching the exterior space 13 as a result.

If there is no fire, the rubber seal M dieses the Interior space til hermetically, which aiss protects the intumescent coating 24 ftom tbe gfllect Pasture 'fmtn

In the drawing of Figure 4, in addition on the end face 27 an intumescent coating 28 surrounding the inside of the gap IS can also be seen, as a result of which, In the event of a fire, the sealing action described is fUfther improved.

In practice, it has been shown that for a fregoency converter housing of the kind typically used for rail vehicles, a thickness 28 of the heat insulation part 4 in the region of 0,S cm to 3 ern is favourable.

List of reference: -characters 11

S 1 Housing 2 Adhesive 3 Connector 4 Heat insulation pari 5 Retaining washer 6 Fastening e So me nr 7 Through-hole 8 The inserted end of the connector 3 9 The end of the connector fastened to the housing part 10 Reinforcement 11 Interior space 117 Partial space 12 Housing part, iid part 13 Exterior space, escape corridor 14 Rail vehicle 15 Driver's cab 15 Passenger area 17 Wall 18 Wall 19 frame part 20 Substance-to-substance bond 21 form-fit connection 22 Outer wali surface of the housing part 12 23 Inner wall surface of the housing part 12 24 Intumescent coating 25 Gap 26 Seal 27 Insulation plate 28 Coating 29 Thickness of the heat insulation part 4

Claims

izabadaimi claims: l Fireproof housing for the iám converter, especially a slr. iW "Housing (made of metal material, including: ·» a flame-retardant part of a flammable material (¾ of the Hl $ (1) on the Fourth D2 is arranged on an outer wall surface (22) to in the interior (M), in the case of a stem, the adjacent outer space (13) is in the half of the thermal stream, the main part (4) and the housing part (:! 2) at the end connection (20) of the material and the bullet, the material sealing connection (21) is engaged in a recess, characterized in that the material closure (20) is an adhesive layer formed on the entire surface between the outer wood surface (22) and the surface of the insulating part (4) facing the housing part (12). (2} is formed.

2. M 1, Demand body housing, characterized in that the material closure (21) is formed by a plurality of connectors (3), each of the connectors (3) being connected to the housing part (12) by one end (9) and a second end (9) thereof. (8) is inserted through the through hole (?) Of the thermal insulating part (4), where the pierced end (8) is provided with a support (Sj extends beyond the hatching portion (4).

Housing according to one of Claims X <or 2, characterized in that the insulating part (4) is made of mineral material, preferably mineral or rock wool lined with a metallic layer,

Housing according to one of Claims 1, 2 or 2, characterized in that the insulating part (4) is a sheet of fire-resistant material, particularly a fire-retardant sheet.

Housing according to Claim 3 or 4, characterized in that the insulating part (4) extends from the housing space (13) towards the interior space (11) of the housing (11) at least in the housing frame (19). completely covered, ö. Housing according to one of Claims 1 to 5, characterized in that the housing part (12) is coated with a heat-sealing coating (24), the wall (M). §. By demand! housing, characterized in that the heat-swelling coating (24) penetrates! k is a gap (25) formed by the adjacent front face (27) of the inner wall surface (23) and the housing (L) of the housing (IS). X7, ifinyponl house, ®s; 28l leaves · i biM ^ newsletter | 24 | it is a village ggy? trösltéssfI? {W), amhlylsrés. (2S | phypype nd vars. F. &Amp; X Required item, i.e., the homigree binding agent: {22} in the gap (25 [mu] rbemai ©, with a thermoplastic coating (28)) , t & The previous verb is chewed by any house, characterized by a delicate character, as the inner: tat (: i. 1} islands) (27) is divided into masons (1Γ). the house part (12) is a wooden frame that covers the raster (H '} «of the house (13) towards the outer space (13), IX The previous Claims ibérmily ^ e.tzéríihlíl, characterized by i © §y * lake * The thickness of the ****** part (4) (29.) ranges from XI to 4 cm and 4 cm to 1g.