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EP 0 809 074 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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12.03.2003 Bulletin 2003/11 |
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Date of filing: 23.05.1997 |
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Ice-free discharge structure
Eisbildungsfreier Abfuhraufbau
Structure d'evacuation sans formation de givre
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Designated Contracting States: |
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BE DE FR GB IT NL |
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Priority: |
24.05.1996 NL 1003203
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Date of publication of application: |
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26.11.1997 Bulletin 1997/48 |
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Proprietor: UBBINK NEDERLAND B.V. |
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NL-6984 AA Doesburg (NL) |
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Inventors: |
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- van Dijk, Floris
6983 AA Doesburg (NL)
- Ravestein, Frans Gerrit
3931 EL Woudenberg (NL)
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Representative: Ferguson, Alexander |
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Octrooibureau Vriesendorp & Gaade,
P.O. Box 266 2501 AW Den Haag 2501 AW Den Haag (NL) |
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References cited: :
EP-A- 0 654 638 US-A- 3 972 696
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EP-A- 0 679 841 US-A- 4 236 443
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The invention relates to a discharge structure for an outlet structure of a gas discharge
apparatus, such as a heating system, in particular a heating boiler. The invention
further relates to a so-called outlet structure for a closed gas appliance, comprising
an air supply structure and a discharge structure according to the invention.
[0002] Outlet structures for open or closed gas appliances are known from patent literature.
For this purpose reference can be made i.a. to European patent application 0.654.638
and European patent 0.418.976, both in the applicant's name.
[0003] Whenever damp discharge gasses, such as combustion gasses from a so-called high-efficiency
boiler, or damp air, reach the outlet of the gas discharge pipe and beyond, condensate
will occur on parts of the discharge structure located there, which parts, as a result
of the ambient temperature, are colder than the discharged gas. As long as there is
a question of condensate this does not necessarily constitute a problem. This can,
however, be the case if the ambient temperature is so low, that the condensate freezes
and ice accumulates or icicles are formed. These ice formations can prevent the discharge
structure from operating properly, especially if they form an uninterrupted plate
of ice. When it starts thawing and they loosen from the discharge structure they can
damage the roof structure or constitute a hazard for people or objects below or nearby.
[0004] The screening means comprise a cover plate located downstream or above the outlet
of the gas discharge pipe, which cover plate is arranged substantially perpendicular
to the centre line of the discharge pipe. A suchlike cover plate is there to prevent
a (fall) wind blowing directly into the gas discharge pipe and thus obstructing the
discharge. Besides, the cover plate prevents birds from entering and too much rain
coming in as well. Condensate takes place against the lower side of the cover plate.
It will be possible for condensate drops to collect on the lower side and drip down.
To aid this the lower side is often formed having a central lowest portion, to where
the drops can flow along the lower side.
[0005] An outlet structure with a provision for collecting and returning condensate to inside
,parts of the outlet structure as described in the preamble of claim 1 is known from
the Dutch patent application 94.00659. In one embodiment the discharge structure in
that outlet structure is provided with a collecting dish, which has a circumference
such that condensate drops from parts located therabove, especially the cover plate,
are collected and which connects at its lower end in a water drop discharging fashion
to the combustion gas discharge pipe. In this known discharge structure the intention
is, among other things, to collect the water drops that have thus been led into the
gas discharge pipe at the bottom of the discharge gas pipe, so that from there they
are conveyed to the sewer system, for example.
[0006] It can happen that the discharge structure is inclined such that the intended lowest
portion of the plate is in fact no longer the lowest portion thereof, but instead
edge areas of the plate, as a result of which the drops will collect there and fall
downwards past the collecting dish, and consequently icicles will form on lower parts
such as an air inlet hood or a roof tile, with all the adverse consequences that that
entails.
[0007] The invention now aims at providing a discharge structure or an outlet structure
of the kind described in the opening paragraph, with which an improved and thus safer
removal and collection of condensate is possible, so that ice formation is virtually
ruled out. To this end the invention provides a discharge structure as described in
claim 1. Preferably the condensate guiding means comprise a number of circumferentially
arranged bars or strips that surround the outlet and a downstream area thereof in
radially outward direction and extend with a component in the pipe direction and that
are in discharging liquid communication with the collecting means.
[0008] The condensate guiding means, in particular bars or strips, ensure interception,
adhesion and guiding of the drops to the collecting means, irrespective of the shape
of the cover plate, also if the discharge structure is inclined. As a result of adhesion
forces the condensate drops will remain on the bars and will flow down along them
to the collecting means, across through the gas flow. The bars can make even a lowest
portion on the cover plate superfluous. So the plate can be formed in several different
ways, for instance even with a concave lower side. The bars or strips moreover provide
for guidance of the discharge gasses and also for wind interruption, so that in the
case of hard wind drops are, to a large extent, prevented from being swept along and
then landing at places outside the collecting means where ice formation then occurs.
[0009] Preferably the bars or strips are substantially vertically oriented. In addition
it is preferable if the bars connect at their downstream end to a ring or dish, which
may be integral with the cover plate so that they, too, form an integral part with
the latter.
[0010] It is then especially advantageous if the said ring or dish is provided with radially
inward notches or recesses between the bars connections. Thus it is realized that
the connection of a bar with the ring, dish or plate will almost certainly, even if
in an extremely slanting position, will form a lowest point for the plate, so that
drops of condensate formed on the plate will flow off via the bars to the collecting
means. Alternatively, or additionally, near the connection to the bars or strips the
cover plate or ring can be provided on the lower side with discharge guiding formations,
such as ridges.
[0011] The screening means can, in a manner known per se, comprise a wind shelter strip
surrounding the outlet at a radial distance, the downstream edge of which is located
- in a vertical projection - within the outer circumference of the collecting means.
A suchlike wind shelter strip can have the shape of a cylindrical band. Condensate
that forms on the inside thereof and subsequently runs off will be collected by the
collecting means and discharged via the aformentioned passing means to the gas discharge
pipe.
[0012] There being present a suchlike wind strip, the bars or strips are radially outwardly
spaced from the wind shelter strip.In this way a double discharge of condensate is
provided. The run-off of the drops along the bars is not interrupted by horizontal
parts such as a wind shelter strip. Moreover, a two-stage wind interruption is provided.
In addition, with the same effect, a narrower (less high) wind shelter strip can be
selected, whereby the condensate forming surface thereof will be reduced and the structure
height can be restricted.
[0013] The invention will now be explained on the basis of an exemplary embodiment shown
in the accompanying drawings in which:
figure 1 shows a part of the outlet structure including an exemplary embodiment of
the discharge structure, shown in exploded view;
figure 2 shows the part of the outlet structure of figure 1, in assembled condition;
figure 3 shows a perspective view of the discharge structure of figure 1; and
figure 4 shows a cross section of the discharge structure of figure 1.
[0014] In figure 1 is shown an air supply hood 2, which is provided on its lower side with
a main air supply to an air supply pipe 5 located therebelow for a closed gas appliance,
also located therebelow, and is provided on the upper end with a surrounding wind
shelter ring 3, which screens a secondary air pressure relief opening.
[0015] A gas discharge pipe 4, which also comes from the gas appliance and is concentrically
located within the air supply pipe 5, reaches above the air supply hood 2.
[0016] Above the air supply hood 2 there is a condensate collection dish 6 with positioning
ring 13 and outside that an inclined radially outwardly ascending and surrounding
collection surface 11 and a surrounding upright outer edge 12. The dish 6 is further
provided with a discharge pipe stub 21, which is coaxial with the ring 13 and has
the same diameter. The pipe stub 21 is formed integrally with connecting webs 24 regularly
spaced from each other in circumferential direction (fig. 4), which in this case are
themselves formed integrally with the rest of the dish 6. The discharge pipe stub
21, the webs 24 and the collection surface 11 determine radial passages 26 for condensed
water to the inside of the discharge pipe 4, which passages are aligned with that
surface 11.
[0017] Above that a discharge hood 7 is shown (vide also fig. 3), which is formed in one
part and comprises as it were a horizontal and a vertical screen structure, the vertical
screen structure being formed by vertical bars 18, which are separated from each other
by vertical passages 19 and are connected to each other at the top by means of plate
8, which substantially serves as fall wind screen, and are connected to each other
at the bottom by means of a surrounding flange 17, which is provided on the outside
with a sharp clamping edge 23. The horizontal screen structure is formed by a wind
shelter strip 20, which is at a radially inward distance from the bars 18 and located
about and at a distance from the upper end of the discharge pipe stub 21 and the area
located directly above there. The wind shelter strip 20 and the discharge pipe stub
21 define between them an axial annular space 10 (fig. 4). The wind shelter strip
20 is held in position by means of a number of vertical connecting webs 22 spaced
from each other in circumferential direction, which are in this case formed integrally
with the wind shelter strip 20 and the plate 8. In between the webs 22 there are gas
discharge openings 25.
[0018] In figure 1 it can be seen the gas discharge pipe 4 is provided at its top end with
an edge 9 with an enlarged diameter, in which the positioning ring 13 of dish 6 is
received with a press fit. The inner surface of the positioning ring 13 will therefore
be in line with the inner surface of the gas discharge pipe 4 (fig. 4).
[0019] The other parts of the outlet structure 1 according to the invention can also be
positioned from above.
[0020] In doing that the hood 7 is positioned on top of the collecting dish 6. Fixing the
hood 7 to the dish 6 takes place with the help of a press fit or by clamping (fig.
4), to which end the surrounding flange 17 with the downwardly inclined and outwardly
extending clamping edge 23 engages in the inner surface of the upright edge 12 of
collecting dish 6.
[0021] The outlet structure is thus assembled and takes on the appearance of figure 2 or
4. Upon assembly no screws are needed, nor is riveting necessary. The division in
the various parts has the added advantage that the parts can be manufactured from
the material most suited to their function, taking among other things the temperature
load into consideration. It is important that the collecting dish 6 is made of condensate
and temperature resistant material. Attention should be paid that the material used
for the hood 7 is resistant to high temperatures, as well as being resistant to condensate
and UV proof. Materials filled with glass can be dispensed with, whereby the hygroscopic
effects linked to that will be absent.
[0022] As a consequence of the ambient temperature outside the hood the surfaces which are
struck by the discharge gasses will be relatively cold and will thus form potential
condensate surfaces. The most important of these are the inner surface of the wind
shelter strip 20 and the lower surface of the plate 8. Condensate formed and collected
on the plate 8 will be able to drop down in the direction C under the influence of
gravity. The condensate formed on the inner surface of the wind shelter strip 20 will
flow downwards in the direction E and will then continue to drop downwards (direction
K) through the annular gap between the wind shelter strip 20 and the discharge pipe
stub 21 to land on the collecting surface 11. From there the condensate can then flow
off in radially inward direction F and subsequently pass through the passages 26 and
then drop or flow downwards in the pipe 4 in the direction J.
[0023] If the outlet structure is slanted the plate 8 will also be inclined, whereby the
condensate drops will move outward along the lower surface to the lowest point (G),
from where they would drop down outside the collecting dish 6 to then contribute to
undesirable formation of ice on lower parts of the roof or of the outlet structure.
In accordance with the invention, the hood 7 is provided on the outer circumference
with vertical webs or bars 18. Condensate which runs down along the plate 8 in outward
direction will arrive at the surface of a bar 18 via the lower surface of the plate
8, be deflected downward (H) under the influence of adhesion and gravitational force
and then run off in the direction D, to finally fall from the lower end 14 thereof
on the collection surface 11 and to be further drained off (F) in the manner described
above. Transferring the condensate drops to the bars 18 is promoted further by the
curved course or the extension with a radially outward component of the bars 18 near
the connection to the plate 8, whereby in the vicinity of the connecting area between
a bar 18 and the plate 8 a lowest point of the top end of the hood 7 is almost always
formed. A usually used cover plate with a lowered centre is then no longer needed.
[0024] If condensate arrives on the outside of the bars 18 as a result of hard gusts of
wind, it will be able to flow downwards along that outside and be collected in the
surrounding, bowl-shaped space formed between the lower end 14 of the bars 18, the
retaining edge 12 located at some radial outward distance therefrom and the flange
17. At the location of the openings 19 the bowl drains to the inside through the lower
portion of these openings 19 (arrow I), so that the condensate too can fall on the
collecting surface 11 and can be further drained in the manner described above.
1. Discharge structure for an outlet structure of a gas discharge apparatus, such as
a heating system, in particular a heating boiler, comprising a gas discharge pipe
(4), means (7) for screening the outlet of the gas discharge pipe (4) and means (6)
for collecting condensation from the screening means, in which at least near the outlet
of the gas discharge pipe means (9) are provided for guiding and passing condensation
from the collecting means (6) to the inside of the gas discharge pipe, the screening
means (7) comprising a cover plate (8) placed above the outlet of the gas discharge
pipe (4), and means (18) for guiding condensation from the cover plate (8) towards
the collecting means (6), characterized in that said condensation guiding means (18) extending to the circumferential edge of the
cover plate (8) and being directly connected to the circumferential edge of the cover
plate.
2. Discharge structure according to claim 1, wherein said condensation guiding means
(18) are formed integrally with said circumferential edge of the cover plate (8).
3. Discharge structure according to claim 1 or 2, wherein the condensation guiding means
(18) comprise a number of circumferentially arranged, preferably substantially vertically
oriented bars or strips (18) that surround the outlet and a downstream area thereof
in radially outward direction and extend with a component in the pipe direction and
that are in discharging liquid communication with the collecting means (6).
4. Discharge structure according to claim 3, wherein the bars or strips (18) form a basket
structure (7) with the cover plate (8).
5. Discharge structure according to any one of the claims 1-4, wherein the condensation
guiding means, in particular bars (18) connect at a downstream end to an end ring
or end disk (8), which can be part of the cover plate.
6. Discharge structure according to claim 5, wherein the cover plate (8) or ring and
the bars (18) form radially inward notches or recesses in the connecting area thereof
or in the vicinity, wherein the guide means extend near the cover plate with at least
a component in radial outward direction.
7. Discharge structure according to claim 5 or 6, wherein the bars or strips (18) are
with their upstream end spaced from and located above the collecting means (6).
8. Discharge structure according to claim 5, 6 or 7, wherein near the connection to the
bars or strips (18) the cover plate (8) or ring is provided on the lower side with
discharge guiding formations, such as ridges.
9. Discharge structure according to any one of the preceding claims, wherein the screening
means (7) comprise a wind shelter strip (20) surrounding the outlet at a radial distance,
the downstream edge of which is located in a vertical projection within the outer
circumference of the collecting means (6), the condensation guiding means, in particular
bars or strips (18) being radially outwardly spaced from the wind shelter strip (20).
10. Discharge structure according to any one of the claims 5-9, wherein the bars (18)
merge at their upstream end in a flange (17), which is provided, with means for entering
into a connection with the collecting means (6).
11. Discharge structure according to any one of the preceding claims wherein at the upstream
end of the condensation guiding means, in particular bars or strips (18), on the radial
outward side thereof, retaining means (12) are provided for collecting and discharging
condensation which flows down along the outside of the bars or strips to the collecting
means.
12. Discharge structure according to claims 11, wherein the retaining means being shaped
as a retaining edge (12) surrounding the bars or strips at a radially outward distance.
13. Discharge structure according to any one of the preceding claims, wherein the gas
discharge pipe (4), the collecting means (6) and the screening means (7) are connected
to each other by means of press fits.
14. Outlet structure for closed gas appliances, comprising an air inlet structure (2)
and a discharge structure (1) according to any one of the preceding claims.
1. Abfuhraufbau für einen Auslaßaufbau eines Gasabfuhrgeräts, wie eines Heizkörpers,
insbesondere eines Heizboilers, umfassend ein Gasabfuhrrohr (4), Mittel (7) zur Abschirmung
des Auslasses des Gasabfuhrrohrs (4) und Mittel (6) zum Auffangen von Kondenswasser
von den Abschirmungsmitteln, wobei zumindest nahe dem Auslaß des Gasabfuhrrohrs Mittel
(9) vorgesehen sind zur Führung und Durchführung von Kondenswasser von den Auffangmitteln
(6) zum Inneren des Gasabfuhrrohrs, wobei die Abschirmungsmittel (7) eine über den
Auslaß des Gasabfuhrrohrs (4) angeordnete Deckplatte (8) und Mittel (18) zum Führen
von Kondenswasser von der Deckplatte (8) zu den Auffangmitteln (6) umfassen, dadurch gekennzeichnet, daß die Kondenswasserführungsmittel (18) sich bis zu dem umlaufenden Rand der Deckplatte
(8) erstrecken und direkt mit dem umlaufenden Rand der Deckplatte verbunden sind.
2. Abfuhraufbau nach Anspruch 1, wobei die Kondenswasserführungsmittel (18) integral
mit dem umlaufenden Rand der Deckplatte (8) gebildet sind.
3. Abfuhraufbau nach Anspruch 1 oder 2, wobei die Kondenswasserführungsmittel (18) eine
Anzahl umlaufend angeordnete, vorzugsweise hauptsächlich vertikal orientierte Stangen
oder Streifen (18) umfassen, die den Auslaß und einen stromabwärts gelegenen Gebiet
davon in radial auswärtse Richtung umgeben und sich mit einem Komponent in Rohrrichtung
erstrecken und die in abführender Flüssigkeitsverbindung mit den Auffangmitteln (6)
stehen.
4. Abfuhraufbau nach Anspruch 3, wobei die Stangen oder Streifen (18) mit der Deckplatte
(8) einen Korbaufbau (7) bilden.
5. Abfuhraufbau nach einem der Ansprüche 1 - 4, wobei die Kondenswasserführungsmittel,
insbesondere Stangen (18), an einem Stromabwärtsende an einen eventuell zu der Deckplatte
gehörenden Endring oder -Scheibe anschließen.
6. Abfuhraufbau nach Anspruch 5, wobei die Deckplatte (8) oder Ring und die Stangen (18)
in dessen Anschlußbereich oder in der Nähe radial einwärtse Einkerbungen oder Einbuchtungen
bilden, wobei die Führungsmittel sich nahe der Deckplatte mit zumindest einem Komponent
in radial auswärtse Richtung erstrecken.
7. Abfuhraufbau nach Anspruch 5 oder 6, wobei die Stangen oder Streifen (18) mit ihrem
Stromaufwärtsende in Entfernung von und über den Auffangmitteln (6) gelegen sind.
8. Abfuhraufbau nach Anspruch 5, 6 oder 7, wobei die Deckplatte (8) oder Ring nahe der
Verbindung mit den Stangen oder Streifen (18) an der Unterseite mit Abfuhrführungsformationen,
wie Rücken, versehen ist.
9. Abfuhraufbau nach einem der vorhergehenden Ansprüche, wobei die Abschirmungsmittel
(7) einen in radialer Entfernung um die Ausmündung umlaufenden Windschattenband (20)
umfassen, dessen stromabwärtse Rand in einer vertikalen Projektion innerhalb von dem
Außenumfang der Auffangmittel (6) gelegen ist, wobei die Kondenswasserführungsmittel,
insbesondere die Stangen oder Streifen (18), in radialer auswärtser Entfernung von
dem Windschattenband (20) gelegen sind.
10. Abfuhraufbau nach einem der Ansprüche 5-9, wobei die Stangen (18) an ihrem Stomaufwärtsende
in einen Flansch (17) übergehen, welcher mit Mitteln zum Herstellen einer Verbindung
mit den Auffangmitteln (6) versehen ist.
11. Abfuhraufbau nach einem der vorhergehenden Ansprüche, wobei an dem Stromaufwärtsende
der Kondenswasserführungsmittel, inbesondere Stangen oder Streifen (18), an ihrem
radialen Auswärtsende, Staumittel vorgesehen sind zum Auffang und Abfuhr von entlang
der Außenseite der Stangen oder Streifen abfließendem Kondenswasser zu den Auffangmitteln.
12. Abfuhraufbau nach Anspruch 11, wobei die Staumittel als ein in radialer auswärtser
Entfernung um die Stangen oder Streifen umlaufender Staurand gebildet sind.
13. Abfuhraufbau nach einem der vorhergehenden Ansprüche, wobei das Gasabfuhrrohr (4),
die Auffangmittel (6) und die Abschirmungsmittel (7) durch Preßpassungen miteinder
verbunden sind.
14. Ausmündungsaufbau für geschlossene Gasgeräte, umfassend einen Luftzufuhraufbau (2)
und einen Abfuhraufbau (1) nach einem der vorhergehenden Ansprüche.
1. Structure d'évacuation pour une structure de sortie d'un dispositif d'évacuation de
gaz, tel qu'un système de chauffage, en particulier une chaudière, comportant un tuyau
d'évacuation de gaz (4), des moyens (7) pour protéger la sortie du tuyau d'évacuation
de gaz (4) et des moyens (6) pour recueillir la condensation provenant des moyens
de protection, dans lequel au moins à proximité de la sortie du tuyau d'évacuation
de gaz des moyens (9) sont agencés pour guider et faire passer la condensation depuis
les moyens de recueil (6) vers l'intérieur du tuyau d'évacuation de gaz, les moyens
de protection (7) comportant une plaque de couvercle (8) placée au-dessus de la sortie
du tuyau d'évacuation de gaz (4), et des moyens (18) pour guider la condensation provenant
de la plaque de couvercle (8) en direction des moyens de recueil (6), caractérisée en ce que lesdits moyens de guidage de condensation (18) s'étendent vers le bord circonférentiel
de la plaque de couvercle (8) et sont directement reliés au bord circonférentiel de
la plaque de couvercle.
2. Structure d'évacuation selon la revendication 1, dans laquelle lesdits moyens de guidage
de condensation (18) sont formés en un seul bloc avec ledit bord circonférentiel de
la plaque de couvercle (8).
3. Structure d'évacuation selon la revendication 1 ou 2, dans laquelle les moyens de
guidage de condensation (18) comportent plusieurs barres ou bandes (18) agencées circonférentiellement,
de préférence orientées sensiblement verticalement, qui entourent la sortie et une
surface en aval de celle-ci dans une direction radialement vers l'extérieur et s'étendent
en ayant une composante dans la direction du tuyau et qui sont en communication de
liquide s'évacuant avec les moyens de recueil (6).
4. Structure d'évacuation selon la revendication 3, dans laquelle les barres ou bandes
(18) forment une structure de panier (7) avec la plaque de couvercle (8).
5. Structure d'évacuation selon l'une quelconque des revendications 1 à 4, dans laquelle
les moyens de guidage de condensation, en particulier les barres (18), sont reliés
à une extrémité aval à un anneau d'extrémité ou disque d'extrémité (8) qui peut être
une partie de la plaque de couvercle.
6. Structure d'évacuation selon la revendication 5, dans laquelle la plaque de couvercle
(8) ou l'anneau et les barres (18) forment des encoches ou évidements radialement
vers l'intérieur dans leur zone de liaison ou au voisinage de celle-ci, les moyens
de guidage s'étendant à proximité de la plaque de couvercle en ayant au moins une
composante dans la direction radiale vers l'extérieur.
7. Structure d'évacuation selon la revendication 5 ou 6, dans laquelle les barres ou
bandes (18) ont leur extrémité amont espacée des moyens de recueil (6) et positionnée
au-dessus de ceux-ci.
8. Structure d'évacuation selon la revendication 5, 6 ou 7, dans laquelle à proximité
de la liaison aux barres ou bandes (18), la plaque de couvercle (8), ou l'anneau,
est munie sur le côté inférieur de formations de guidage d'évacuation, telles que
des arêtes.
9. Structure d'évacuation selon l'une quelconque des revendications précédentes, dans
laquelle les moyens de protection (7) comportent une bande pare-vent (20) entourant
la sortie à une distance radiale, dont le bord aval est positionné dans une saillie
verticale existant dans la circonférence extérieure des moyens de recueil (6), les
moyens de guidage de condensation, en particulier les barres ou bandes (18), étant
espacés radialement vers l'extérieur à partir de la bande pare-vent (20).
10. Structure d'évacuation selon l'une quelconque des revendications 5 à 9, dans laquelle
les barres (18) rejoignent à leur extrémité amont un rebord (17), qui est muni de
moyens pour entrer en liaison avec les moyens de recueil (6).
11. Structure d'évacuation selon l'une quelconque des revendications précédentes, dans
laquelle à l'extrémité amont des moyens de guidage de condensation, en particulier
les barres et bandes (18), sur leur côté radial extérieur, des moyens de retenue (12)
sont agencés pour recueillir et évacuer la condensation qui s'écoule vers le bas le
long de l'extérieur des barres ou bandes vers les moyens de recueil.
12. Structure d'évacuation selon la revendication 11, dans laquelle les moyens de retenue
sont en forme de bord de retenue (12) entourant les barres ou bandes à distance radialement
vers l'extérieur.
13. Structure d'évacuation selon l'une quelconque des revendications précédentes, dans
laquelle le tuyau d'évacuation de gaz (4), les moyens de recueil (6) et les moyens
de protection (7) sont reliés les uns aux autres par l'intermédiaire d'agencements
serrés.
14. Structure de sortie pour des accessoires à gaz fermés, comportant une structure d'entrée
d'air (2) et une structure d'évacuation (1) selon l'une quelconque des revendications
précédentes.