SI9300062A

SI9300062A - Burner cylinder for premixing forced draught burners of gas heating apparatus

Info

Publication number: SI9300062A
Application number: SI19939300062A
Authority: SI
Inventors: Adolf Heeb
Original assignee: Hoval Interliz Ag
Priority date: 1992-02-04
Filing date: 1993-02-04
Publication date: 1993-09-30
Also published as: EP0554541B1; DE59203387D1; HRP930100B1; GR3018129T3; ES2078636T3; CZ386592A3; EP0554541A2; RU2104444C1; DK0554541T3; SK386592A3; ATE126873T1; CZ281489B6; DE9201313U1; SK278762B6; HRP930100A2; EP0554541A3

Abstract

The burner cylinder contains, arranged concentrically with one another between a connection flange (1) having the inlet opening, and a closed cover (2), an outer flame-holding cylinder (3), a central distributing cylinder (4) and an inner throttling cylinder (5). The cover (2) consists in two parts of a cover inner plate (7) and a cover outer plate (8). The connection flange (1) and the cover (2) are held together by the central distributing cylinder (4) which is at both edges connected in a rigid and sealed manner to the connection flange (1) and to the cover inner plate (7). The inner throttling cylinder (5) is fastened at one edge in the burner cylinder and unfastened at the other edge. The outer flame holding cylinder (3) is held, axially and radially movably and sealed, in annular-groove-like mountings (6) of the connection flange (1) and of the cover outer plate (8). The two cover plates (7, 8) are held together by a connection, by means of which the cover outer plate (8) can be pressed off the cover inner plate (7) in an elastically flexible manner. <IMAGE>

Description

(57) Zgorevalni cilinder obsega med priključno prirobnico (1), ki ima vstopno odprtino, in zaprtim pokrovom (2) medsebojno koncentrično razporejena zunanji cilinder (3) za varovanje plamena, srednji porazdelilni cilinder (4) in notranji dušilni cilinder (5). Pokrov (2) je dvodelen in sestoji iz notranje plošče (7) pokrova in zunanje plošče (8) pokrova. Priključna prirobnica (1) in pokrov (2) sta skupaj držana s pomočjo srednnjega porazdelilnega cilindra (4), ki je na obeh robovih trdno in zatesnjeno povezan s priključno prirobnico (1) in z notranjo ploščo (7) pokrova. Notranji dušilni cilinder (5) je v zgorevalnem cilindru na enem robu pritrjen, na drugem pa ne. Zunanji cilinder (3) za varovanje plamena je na obeh robovih držan aksialno in radialno gibljivo in zatesnjeno v kot obračast utor zasnovanih držalih (6) priključne prirobnice (1) in zunanje plošče (8) pokrova. Obe plošči (7,8) pokrova sta skupaj držani s pomočjo vezi, ki omogoča, da je zunanja plošča (8) pokrova vzmetno podajno potisljiva od notranje plošče (7) pokrova.(57) The combustion cylinder comprises, between a connecting flange (1) having an inlet opening and a closed lid (2), a concentrically arranged external cylinder (3) for flame protection, a central distribution cylinder (4) and an internal damping cylinder (5). The lid (2) is two-piece and consists of an inner plate (7) of the lid and an outer plate (8) of the lid. The connecting flange (1) and the cover (2) are jointly held together by means of a central distribution cylinder (4), which is firmly and sealed at both edges by the connection flange (1) and the inner plate (7) of the cover. The internal damping cylinder (5) is attached to the combustion cylinder at one edge but not at the other. The outer cylinder (3) for flame protection is held axially and radially movable on both edges and sealed into the annular groove of the designed retainers (6) of the connecting flange (1) and the outer cover plate (8). The two panels (7,8) of the cover are held together by means of a bond, which allows the outer plate (8) of the cover to be spring-loaded removably from the inner plate (7) of the cover.

Hoval Interliz AGHoval Interliz AG

Zgorevalni cilinder za predmešalne puhalne gorilnike plinskih grelnih napravCombustion cylinder for pre-mixing blowers for gas heaters

Izum se nanaša na zgorevalni cilinder za predmešalne puhalne gorilnike plinskih grelnih naprav po uvodnem delu glavnega zahtevka.The invention relates to a combustion cylinder for pre-mixing blower burners for gas heating appliances according to the introductory part of the main claim.

Naprimer pri plinskih grelnih kotlih za grelne naprave za toplo vodo se uporabljajo puhalni gorilniki, pri katerih zmes iz gorilnega plina in zraka, kije pred oblikovanjem plamena večinoma nadstehiometrično predzmešana, dovedejo v zgorevalni cilinder, ki je razporejen v plinski grelni napravi prednostno viseče in ki ima kot zunanje ostenje cilinder za varovanje plamena iz perforiranega, na vročini obstojnega pločevinskega materiala, ob katerem prihaja do tvorbe plamena. Za dosego kar se da enakomerne, homogene porazdelitve zmesi po skupni cilindrični površini zgorevalnega cilindra in za dosego zgorevanja zmesi s kar se da nizkimi vrednostmi dušikovega oksida pri hkrati ekstremno nizki vrednosti nastajajočega ogljikovega monoksida ima novodobno nadalje razvit zgoraj omenjeni zgorevalni cilinder še dva nadaljnja, prav tako iz perforiranega, na vročini obstojnega pločevinskega materiala narejena cilindra, in sicer v cilindru za varovanje plamena z radialnim odmikom porazdelilen cilinder in v tem z radialnim odmikom dušilen cilinder. Ti trije cilindri so razporejeni med priključno prirobnico, ki vsebuje odprtino za vstop zmesi v zgorevalni cilinder, in pokrovom, ki zapira na nasprotni strani ležeči konec zgorevalnega cilindra, pri čemer sta priključna prirobnica in pokrov zasnovana s tremi koncentričnimi obročastimi utori, v katere so s svojimi robovi vstavljeni ti trije cilindri. Zunanji cilinder za varovanje plamena je s pomočjo več radialnih vijačnih sornikov pritrjen na obeh robovih v obročastem utoru priključne prirobnice in pokrova, da se drži skupaj priključno prirobnico in pokrov in s tem ves zgorevalni cilinder. Porazdelilni cilinder in dušilni cilinder pa sta temu nasprotno pri večinoma običajni viseči ureditvi zgorevalnega cilindra s spodaj ležečim pokrovom pritrjena v obročastih utorih pokrova s pomočjo radialnih vijačnih somikov samo na njunem spodnjem robu in sta na zgornjem robu v obročastih robovih priključne prirobnice aksialno gibljiva, da priključna prirobnica in pokrov lahko menjata svoj medsebojen razmik, ko zunanji cilinder za varovanje plamena, ki je zaradi menjanja temperature najmočneje obremenjen, menja svoj aksialni položaj. Robova cilindra za varovanje plamena, ki sta pritrjena v obročastih utorih priključne prirobnice in pokrova, je potrebno tudi zatesniti s pomočjo vloženih, na visoki temperaturi obstojnih specialnih tesnil, ker bi netesnosti za plin na vpetih robovih cilindra za varovanje plamena močno motile sliko plamena in zgorevanje. Pri zgoraj opisanem znanem zgorevalnem cilindru se je pokazalo, da je za dosego želene enakomerne tvorbe plamena in malo škodljivih snovi ustvarjajočega zgorevanja zmesi tudi pomembno, da se porazdelilni cilinder na obeh robovih v obročastih utorih, ki sprejmeta ta robova, vpne tesno proti plinu, ker bi netesnosti na robovih cilindra motile želeno in potrebno funkcijo porazdeljevanja zmesi porazdelilnega cilindra. Zaradi velikih dolžinskih sprememb, ki se zaradi prekinjajočega obratovanja gorilnika stalno pojavljajo, cilindra za varovanje plamena, ki se v fazi vklopa gorilnika segreje do žaljenja, in zaradi spremembe razmika med priključno prirobnico in pokrovom, ki je s tem pri znanem zgorevalnem cilindru ustrezno velika in ki pri večjih razsežnostih zgorevalnega cilindra nad okoli 40 kW postane posebno močna, je pri znanem zgorevalnem cilindru težaven problem, proti plinu tesno vkleščiti rob porazdeljevalnega cilindra, katerega osno gibljivo sprejme obročast utor in ki se segreje in v dolžini spremeni bistveno manj kot cilinder za varovanje plamena. Zgradba in montaža znanega zgorevalnega cilindra sta tudi zaradi zasnove priključne prirobnice, ki je iz litine, in pokrova, ki je prav tako iz litine, s tremi koncentričnimi sprejemnimi obročastimi utori za vse tri pločevinaste cilindre kot tudi zaradi pritrditve pločevinastih cilindrov v sprejemnih utorih s pomočjo več radialnih vijačnih sornikov sorazmerno zamotani.For example, gas boilers for hot water heaters use blower burners in which a mixture of combustible gas and air, which is predominantly super-stoichiometrically pre-blended, is fed into a combustion cylinder arranged in a gas-fired boiler and having as the outer wall of a flame retardant cylinder made of perforated, heat-resistant sheet metal, which produces flame. In order to achieve a uniform, homogeneous distribution of the mixture over the total cylindrical surface of the combustion cylinder and to achieve the combustion of the mixture with the lowest values of nitrous oxide at the extremely low value of the emerging carbon monoxide, the above-mentioned combustion cylinder has been further developed cylinders made of perforated, heat-resistant sheet metal material, namely a distributor cylinder in the flame protection cylinder with radially displaced cylinder and, in this case, a silencer cylinder with radial displacement. These three cylinders are arranged between a connecting flange containing an opening for the mixture to enter the combustion cylinder and a cover closing the opposite end of the combustion cylinder, the flange and the cover being formed by three concentric annular grooves in which their edges inserted these three cylinders. An external cylinder for flame protection is secured by means of several radial screw bolts at both edges in the annular groove of the connecting flange and cover to hold together the connecting flange and cover and thus the entire combustion cylinder. In contrast, for the most part of the conventional suspended arrangement of the combustion cylinder with the lower cover, the distributor cylinder and the damping cylinder are secured in the annular grooves of the cover by means of radial screw sockets only at their lower edge and at the upper edge in the annular edges of the connecting flange, the axial flange the flange and the hood can change their distance from each other when the outer cylinder to protect the flame, which is most heavily laden by changing the temperature, changes its axial position. The edges of the flame retardant cylinders secured in the annular grooves of the flange and the cover must also be sealed with the help of high-temperature special seals inserted, as gas leaks at the flanged edges of the flame retardant cylinder would greatly disturb the flame and combustion image. . In the above-described combustion cylinder, it has been shown that in order to achieve the desired uniform flame formation and low harmful substances of the combustion mixture, it is also important that the distribution cylinder at both edges in the annular grooves receiving these edges tightly clamp to the gas, since leaks at cylinder edges would interfere with the desired and required distribution function of the distribution cylinder mixture. Due to the large length changes, which are constantly occurring due to the interruption of the burner operation, the flame protection cylinder, which is heated to insult during the startup phase of the burner, and due to the change in the distance between the connecting flange and the cover, which is correspondingly large for the known combustion cylinder which becomes particularly strong at larger dimensions of the combustion cylinder above about 40 kW, with the known combustion cylinder it is a difficult problem to tightly clamp the edge of the distributing cylinder against the gas, whose axially movable receiving annular groove and which is heated and changes substantially less than the protection cylinder flames. The construction and installation of the well-known combustion cylinder is also due to the design of the cast flange and the cast iron cap, with three concentric receiving annular grooves for all three sheet cylinders, as well as to the attachment of sheet cylinders in the receiving grooves by means of several radial screw bolts relatively wrapped.

Izum ima zatorej za nalogo, tako zasnovati zgorevalen cilinder uvodoma omenjene vrste, da sta tako cilinder za varovanje plamena kot tudi porazdelilni cilinder na obeh robovih z zanesljivo, proti plinu tesno zvezo, ki nima nujno tudi aksialno gibljivost robov cilindra, priključena na priključni prirobnici in na pokrovu in močno segret cilinder za varovanje plamena v izogib mehanskim napetostnim razpokam kljub temu lahko izvaja zadostno aksialno dolžinsko raztezanje. Razen tega naj bo izdelava in montaža zgorevalnega cilindra enostavneje zasnovana. Ta naloga je po izumu rešena s pomočjo v značilnostnem delu glavnega zahtevka naštetih izvedbenih značilnosti zgorevalnega cilindra. Prednostne nadaljnje značilnosti so podane v podzahtevkih.The invention therefore has the task of designing a combustion cylinder of the aforementioned type such that both the flame shielding cylinder and the distribution cylinder on both edges have a reliable, gas tight connection, which does not necessarily have the axial motility of the cylinder edges, connected at the connecting flange and nonetheless, a sufficiently heated flame retardant cylinder to avoid mechanical stress cracks may nonetheless perform sufficient axial elongation. In addition, the design and assembly of the combustion cylinder should be simpler in design. According to the invention, this task is solved by the help in the characteristic part of the main claim of the performance characteristics of the combustion cylinder. Preferred further features are given in the sub-claims.

Zasnova po izumu zgorevalnega cilindra je v nadaljnjem pobliže opisana na osnovi v skici v osnem vzdolžnem prerezu predstavljenega izvedbenega primera.The design according to the invention of the combustion cylinder is further described on the basis in the drawing in axial longitudinal section of the embodiment shown.

Zgorevalni cilinder ima za visečo ureditev v napravi za ogrevanje s plinom na svojem zgornjem koncu konično priključno prirobnico 1, ki vsebuje odprtino 14 za vstop gorljive zmesi v zgorevalni cilinder, in na svojem spodnjem koncu zaprt pokrov 2. Med priključno prirobnico 1 in pokrovom 2 so razporejeni zunanji cilinder 3 za varovanje plamena, srednji, porazdelilni cilinder 4 in notranji, dušilni cilinder 5. Ti trije cilindri sestoje iz perforiranega, na vročem obstojnega pločevinskega gradiva in so razporejeni koncentrično z radialnim medsebojnim razmikom. Priključna prirobnica 1 in pokrov 2 nista nikakršna lita dela, kot pri uvodoma opisanih običajnih zgorevalnih cilindrih, temveč sta prav tako iz na vročini obstojnega pločevinskega gradiva in oblikovana z vlečenjem pločevine, kar je bistveno enostavneje in ceneje od običajne izdelave obeh teh delov zgorevalnega cilindra iz litine. Razen tega postane s tem tudi masa zgorevalnega cilindra bistveno lažja. Pokrov 2 sestoji dvodelno iz notranje plošče 7 pokrova in zunanje plošče 8 pokrova. Ves zgorevalni cilinder drži skupaj srednji porazdelilni cilinder 4, ki je na obeh robovih trdno in v bistvu zatesnjeno povezan s priključno prirobnico 1 in z notranjo ploščo 7 pokrova. Na spodnjem robu je porazdelilni cilinder 4 s pomočjo točkastega valjenja pritrjen na navzgor usmeijenem robnem zavihku 15 notranje plošče 7 pokrova. Spodnji rob notranjega dušilnega cilindra 5 meji nepritrjeno na notranjo ploščo 7 pokrova. Ob zgornjem robu sta porazdelilni cilinder 4 in dušilni cilinder 5 skupaj s pomočjo točkovnega varjenja pritrjena na sornikih 12, ki so v osni smeri zgorevalnega cilindra vtakljivi skozi luknje za sornike v priključni prirobnici 1 in vijačno povezljivi s priključno prirobnico. S pomočjo teh aksialnih vijačnih sornikov 12 se da oba cilindra 4 in 5 pri montaži zgorevalnega cilindra udobno povezati s priključno prirobnico 1 in ju z enostavno zategnitvijo njunih robov k priključni prirobnici 1 dovesti v zadosten proti plinu tesen dotik s priključno prirobnico 1. Segretje in aksialna raztegnitev porazdelilnega cilindra 4 pri obratovanju gorilnika je bistveno manjša od tiste pri cilindru 3 za varovanje plamena, ki postane žareč, tako da je tudi sprememba razmika med priključno prirobnico 1 in pokrovom 2 držana ustrezno majhna in nastanek reže, do katere pride med spodnjim robom aksialno raztezajočega se dušilnega cilindra, ki se segreje manj kot porazdelilni cilinder, in notranjo ploščo 7 pokrova, ne vpliva omembe vredno na dušilno funkcijo dušilnega cilindra 5. Cilinder 3 za varovanje plamena, ki se skrajno močno segreje, na obeh robovih držita obročasti držali 6 priključne prirobnice 1 in pokrova 2, v katerih je cilinder 3 za varovanje plamena aksialno gibljiv in zaradi sprememb premera, do katerih tudi pride pri spremembi temperature, gibljiv tudi radialno. S pomočjo na visokih temperaturah obstojnih tesnilnih manšet 16, ki oklepata robova cilindra 3 za varovanje plamena, sta robova cilindra za varovanje plamena v bistvu zatesnjena v kot obroča zasnovanih držalih 6. Kot obroča zasnovani držali 6 sta narejeni iz kot črka U oblikovanih robnih zavihkov 13, ki se ju da na priključni prirobnici 1, ki sestoji iz pločevine, in na zunanji plošči 8 pokrova, ki sestoji iz pločevine, narediti enostavno z vlečenjem pločevine. Da bi se predvsem tudi pri velikih premerih zgorevalnega cilindra za naprave za ogrevanje s plinom z velikimi grelnimi zmogljivostmi cilinder 3 za varovanje plamena lahko prosto raztezal v aksialni smeri in ne bi na zgorevalnem cilindru nastajale nikakršne napetostne razpoke ali lomi, sta notranja plošča 7 pokrova, ki je pritrjena na porazdelilnem cilindru 4, in zunanja plošča 8 pokrova, ki drži cilinder 3 za varovanje plamena, skupaj držani s pomočjo vezi, ki pri predstavljenem izvedbenem primeru sestoji iz na sredini pokrova razporejenega vijaka 9 s tlačno vzmetjo 10 in s pomočjo katere je zunanja plošča 8 pokrova vzmetno podajno potisljiva stran od notranje plošče 7. Razume se, da je tudi možno tisti del pokrova 2, ki cilinder 3 za varovanje plamena drži v kot obročast utor zasnovanem ležišču, v notranjosti zgorevalnega cilindra direktno s priključno prirobnico 1 tako povezati, da ta pokrovni del svoj aksialni odmik od priključne prirobnice 1 lahko vzmetno elastično menja. Pri predstavljenem izvedbenem primeru vsebuje aksialno vzmetno podajna vez obeh krovnih plošč 7 in 8 smotrno dodatno Še varovanje proti zasuku, ki sestoji iz čepov 11, ki so pritrjeni na notranji plošči 7 pokrova in z aksialno premakljivostjo uprijemajo v vodilne luknje zunanje plošče 8 pokrova.The combustion cylinder has a conical connection flange 1 containing an opening 14 for the entry of the combustible mixture into the combustion cylinder at the upper end of the gas heating appliance and a cover 2 closed at its lower end. Between the flange 1 and the cover 2 are Arranged outer cylinder 3 for flame protection, medium, distribution cylinder 4 and internal, damping cylinder 5. These three cylinders consist of perforated, hot-resistant sheet metal material and are arranged concentrically with radial spacing. The connection flange 1 and cover 2 are not any cast parts, as in the case of the conventional combustion cylinders described above, but are also made of heat-resistant sheet metal and formed by drawing the sheet, which is significantly simpler and less expensive than the conventional manufacture of both of these combustion cylinder parts. castings. In addition, the mass of the combustion cylinder becomes significantly lighter. Cover 2 consists of two parts from the inner panel 7 of the lid and the outer panel 8 of the lid. The entire combustion cylinder is held together by the middle distribution cylinder 4, which is firmly and substantially sealed at both edges by the flange connection 1 and the inner cover panel 7. At the lower edge, the distribution cylinder 4 is fixed by means of point rolling to an upwardly flanked edge tab 15 of the inner panel 7 of the lid. The lower edge of the inner damper cylinder 5 borders not attached to the inner panel 7 of the lid. Along the upper edge, the distributor cylinder 4 and the damping cylinder 5 are fixed together by spot welding to the bolts 12, which are threaded through the bolt holes in the flange 1 in the axial direction of the combustion cylinder and screwed in to the flange. By means of these axial screw bolts 12, both cylinders 4 and 5 can be conveniently connected to the flange 1 when mounting the combustion cylinder and, by simply tightening their edges, to the flange 1 in close contact with the flange 1, sufficiently gas. the expansion of the distribution cylinder 4 during operation of the burner is significantly smaller than that of the cylinder 3 for protecting the flame, which becomes glowing, so that the change in the distance between the connecting flange 1 and the cover 2 is kept sufficiently small and the formation of a gap which occurs between the lower edge axially an expanding throttle cylinder that heats less than the distribution cylinder and the inner cover plate 7 does not affect the damping function of the throttle cylinder 5. The extremely hot flame cylinder 3 is held on both edges by annular retainers 6 connecting flanges 1 and cover 2 in which the cylinder 3 is to protect the pla axially flexible, and radially flexible due to changes in diameter, which also occur during temperature changes. With the help of high temperature resistant sealing cuffs 16 that encircle the edges of the flame protection cylinder 3, the edges of the flame protection cylinder are essentially sealed into the ring-shaped retainers 6. The ring-shaped retainers 6 are made of U-shaped edge flaps 13 , which can be easily made by pulling the sheet on the connecting flange 1 consisting of sheet metal and on the outer plate 8 of the sheet metal sheet consisting of sheet metal. In order, especially for large combustion cylinder diameters, for high-capacity gas heating appliances, the flame protection cylinder 3 can extend freely in the axial direction and avoid any voltage cracks or fractures on the combustion cylinder, the inner panel 7 is a cover, mounted on the distribution cylinder 4 and the outer cover plate 8 holding the flame protection cylinder 3 held together by means of a bond, in the embodiment shown, consists of a screw 10 with a pressure spring 10 arranged in the middle of the cover, by means of which the outer plate 8 of the lid is spring-loaded, extruded away from the inner plate 7. It is understood that it is also possible to connect the part of the lid 2 which holds the flame protection cylinder 3 in an annular groove to the inside of the combustion cylinder directly with the connecting flange 1. , that this cover portion can be sprung elas its axial distance from the connecting flange 1 changes exactly. In the exemplary embodiment, the axial spring-feed connection of the two cover plates 7 and 8 further comprises a rotary guard consisting of studs 11 which are secured to the inner panel 7 of the cover and are axially movable to the guide holes of the outer panel 8.

Hoval Interliz AG Zanjo: r 4%Hoval Interliz AG For her: r 4%

Claims

A combustion cylinder for pre-mixing blowers for gas heating appliances, with a connecting flange (1) arranged as a front wall portion at one end of the cylinder and comprising an inlet opening of the combustion cylinder for a mixture of combustion gas and air, with a closed lid (2), arranged at the other end of the cylinder as the front wall portion, and with an external flame protection cylinder (3) distributed between the two face walls, with a central distribution cylinder (4) and an internal throttling cylinder (5), perforated, heat-resistant sheet metal cylinders arranged concentrically and with radial spacing, characterized in that the lid (2) consists of two parts of the inner plate (7) of the lid and the outer plate (8) of being a connecting flange (1). and the cover (2) held together by means of a central distribution cylinder (4), which is tightly and substantially sealed at both edges by a connection flange and with inner cover plate (7), the inner damping cylinder (5) being fixed in one combustion cylinder at one edge and not secured at the other edge, so that the outer cylinder (3) for flame protection is held in an annular manner the grooves of the designed retainers (6) of the connecting flange (1) and the outer plate (8) of the cover are axially and radially movable and substantially sealed, and that the two cover plates (7,8) are held together by the connection with which the outer plate ( 8) a spring-loaded feeder away from the inner plate (7).

Combustion cylinder according to claim 1, characterized in that the axially spring-feeding connection of the two cover plates (7, 8) further comprises a rotation guard (11).

Combustion cylinder according to claim 1, characterized in that the distribution cylinder (4) and the damping cylinder (5) are preferably jointly attached to their connecting flange (1) together by the bolts (12) which are in the axial direction of the combustion The cylinders are screwed into the connection flange (1) and the edges of the two cylinders (4, 5) are then sealed to the flange (1).

Combustion cylinder according to claim 1, characterized in that the connecting flange (1) and the outer cover plate (8) are made of sheet metal and flanges designed as annular grooves for the external cylinder (3) to be protected by means of a letter U shaped edge tabs (13) of both sheet metal parts (1,8).

Hoval Interliz AG For her:

22467.PR0.SK-XII / 92

Summary

The combustion cylinder comprises, between the connecting flange (1) having an inlet opening and the closed lid (2), a concentrically arranged external cylinder (3) for flame protection, a medium distribution cylinder (4) and an internal damping cylinder (5). The lid (2) is two-piece and consists of an inner plate (7) of the lid and an outer plate (8) of the lid. The connecting flange (1) and the cover (2) are held together by means of a central distribution cylinder (4), which is firmly and sealed at both edges by the connecting flange (1) and the inner plate (7) of the cover. The internal damping cylinder (5) is attached to the combustion cylinder at one edge but not at the other. The outer cylinder (3) for flame protection is held axially and radially movable at both edges and sealed into the annular grooves of the designed retainers (6) of the connecting flange (1) and the outer cover plate (8). The two panels (7, 8) of the lid are held together by a bond that allows the outer plate (8) of the lid to be spring-loaded remotely from the inner plate (7) of the lid.