[0001] The invention relates to a burner plate for a central heating boiler, which burner
plate comprises a first pattern of through-holes arranged therein, which through-holes
extend between a first, inlet surface and a second, opposite outlet surface of the
burner plate, and which holes are configured to allow passage of a combustible gas
from the inlet surface to the outlet surface and thus form a permeable surface part
of the total outlet surface of the burner plate.
Such a burner plate is per se known. The combustible gas, for instance natural gas,
flows via the inlet surface side, through the through-holes to the outlet surface
side, and will there combust in a flame front.
[0002] A particular kind of burner plate is known from
EP 2 682 676 A1, which discloses a burner plate according to the preamble of claim 1.
EP 3 012 526 A1 discloses a burner plate according to the preamble of claim 1 as well.
[0003] It is an object of the invention to improve the per se known burner plate.
[0004] It can be a particular object of the invention to provide a burner plate with which
a stable combustion and/or a combustion with low CO emission can be obtained in the
case of varying inlet speeds of the gas, more particularly when a lowest inlet speed
is at least 10x lower than a highest inlet speed.
[0005] The lowest inlet speed of gas is used in the case of low load, i.e. in the case of
relatively low heat demand and thereby relatively low power of the central heating
(CH) boiler. The highest inlet speed of gas is used in the case of full load, i.e.
in the case of relatively high heat demand and thereby relatively high power of the
CH boiler. The inlet speed can be any desired speed between the lowest and highest
inlet speed. The adaptation of the CH boiler to the heat demand is referred to as
modulation, wherein a stable combustion and/or a combustion with low CO emission can
preferably be obtained with the burner plate according to the invention in modulation
between 10% and 100% of a maximum power of the CH boiler. This power can for instance
vary between 1.5 kW and 15 kW.
[0006] The temperature of the flame can influence the CO emission, wherein the flame cooling
too much can result in a CO emission which is too high, particularly in the case of
low load. Cooling of the flame can take place inter alia because heat of the flame
is relinquished to the burner plate. The burner plate according to the invention can
particularly be designed such that heat loss from the flame to the burner plate is
relatively low. This can for instance be achieved by making a distance from the flame
to the burner plate relatively great, i.e. relatively long flames. This is particularly
advantageous in the case of low load, i.e. at a low inlet speed of the combustible
gas.
[0007] It can be advantageous, particularly in the case of full load, to prevent or at least
reduce flame lift-off, since flame lift-off can result in an increase in CO emission.
Flame lift-off is here understood to mean that the rate of combustion is at least
locally lower than the speed of the supplied gas, whereby the flame will move away
from the burner plate at least locally. The burner plate according to the invention
can particularly be designed such that flame lift-off is prevented or at least reduced.
This is particularly advantageous in the case of full load, i.e. in the case of a
high inlet speed of the combustible gas.
[0008] One or more of the above stated objects can be achieved with a burner plate as described
in claim 1, wherein for instance the first pattern of through-holes is suitably chosen.
[0009] This enables the passage ratio of the burner plate to be relatively low, the advantages
of which have already been elucidated above. In addition, this can ensure that the
flame positions itself particularly above the burner plate in the centre thereof,
which makes it possible to keep the heat loss of the flame relatively low.
[0010] As elucidated below, the peripheral edge zone can optionally be provided with non-continuous,
blind holes.
[0011] One or more of these objects can in particular be achieved with a burner plate of
the type stated in the preamble, wherein for instance the first pattern is chosen
such that a stable combustion and/or a combustion with low CO emission is obtained
in the case of varying inlet speeds of the gas, more particularly when a lowest inlet
speed is at least 10x lower than a highest inlet speed.
[0012] The burner plate according to the invention, particularly for instance the first
pattern thereof, can have one or more of the features described below and/or included
in the claims.
[0013] In an embodiment of the burner plate according to the invention the first pattern
of through-holes is chosen such that the permeable surface part comprises less than
15% of the total outlet surface of the burner plate, preferably less than 12%, more
preferably less than 10%, still more preferably about 7%. The permeable surface part
can be greater than 3% of the total outlet surface of the burner plate, preferably
greater than 5%.
[0014] The permeable surface part is defined here as the part of the outlet surface of the
burner plate which is permeable to a combustible gas relative to the total outlet
surface of the burner plate. The part of the outlet surface of the burner plate which
is permeable to a combustible gas can here particularly be formed by the sum of the
surface area dimensions of the through-holes.
[0015] It is noted that the above stated percentages are particularly calculated on the
basis of and/or apply particularly to the effective total outlet surface area of the
burner plate. The effective outlet surface area can at least be understood to mean
the part of the outlet surface which is clear and/or is not blocked by for instance
a support for supporting the burner plate. In other words, the effective total outlet
surface area of the burner plate is substantially the whole surface area of the burner
plate, with the exception of a peripheral edge part of the burner plate, which peripheral
edge part of the burner plate is supported. The peripheral edge part of the burner
plate can for instance be formed by recesses, in which recesses a support can be arranged
for the purpose of supporting the burner plate.
[0016] The effective outlet surface area of the burner plate can alternatively be referred
to as the effective surface area of the burner plate and/or the effective burner plate
surface area.
[0017] It is further noted that the term "about" can in this text at least be understood
to mean 10% relative to the stated values or percentages.
[0018] The permeable surface part relative to the total outlet surface, i.e. the passage
ratio, of a burner plate is usually relatively high. It has however been found by
applicant that, by choosing a relatively small permeable surface part relative to
the total outlet surface, the throughflow speed and thereby outflow speed of supplied
gas is relatively high relative to the same amount of supplied gas in the case of
a larger permeable surface part. Because of the relatively high outflow speed of the
supplied gas, the flame front will stabilize at a relatively great distance from the
burner plate, whereby relatively little heat of the flame front will be relinquished
thereto, i.e. the heat loss from the flame to the burner plate is relatively low.
Because the flame front is able to lose relatively little heat to the burner plate
at the chosen relatively low passage ratio, the temperature of the flame can remain
relatively high and the CO emission can be relatively low. This can be particularly
advantageous in the case of low load, as further elucidated above.
[0019] It is noted that the term relative, such as for instance relatively low or high,
can in this text for instance be understood to mean relative to the known burner plates,
such as for instance lower or higher relative to known burner plates.
[0020] In another embodiment of the burner plate according to the invention the burner plate
comprises a second pattern of non-continuous, blind holes.
[0021] The blind holes reduce the heat conductivity of the burner plate relative to a burner
plate without such blind holes, whereby particularly the heat conduction to the periphery
of the burner plate can be reduced or can be relatively low. The burner plate hereby
cools down relatively little at least in the centre thereof, whereby the flame, which
is positioned substantially in the centre above the burner plate, relinquishes relatively
little heat to the burner plate and therefore cools relatively little. This can be
particularly advantageous in the case of low load, as further elucidated above.
[0022] The second pattern of non-continuous, blind holes can particularly be disposed in
the centre of the burner plate, since it is particularly in the centre of the burner
plate that the relatively low heat conduction is desired. It is possible here that
no non-continuous, blind holes are present in a peripheral edge zone, but if it is
useful for any reason, for instance for the sake of simplicity of production engineering,
also to arrange the non-continuous, blind holes in the peripheral edge zone, then
this is possible since it does not have an adverse effect on the operation of the
burner plate.
[0023] The non-continuous, blind holes can be non-continuous or blind on one or both sides
of the burner plate, i.e. at the inlet surface and/or at the outlet surface. The holes
can preferably be blind at the inlet surface. A temperature at the outlet surface
is hereby limited.
[0024] It is noted that, because the blind holes are blind, they are not permeable to combustible
gas. The blind holes therefore do not contribute to the permeable part of the burner
plate.
[0025] The number of through-holes relative to the total number of through- and blind holes
can for instance be a maximum of 35%, preferably a maximum of 30%, more preferably
a maximum of 25%.
[0026] The number of through-holes relative to the total number of through- and blind holes
can for instance be a minimum of 10%, preferably a minimum of 15%, more preferably
a minimum of 20%.
[0027] It has been found by applicant that about 21% through-holes relative to the total
number of through- and blind holes can particularly be available.
[0028] The ratio between through-holes and blind holes can here be about 1 : 3.7.
[0029] In an embodiment of the burner plate according to the invention holes, i.e. through-holes
and blind holes, can be provided over substantially the whole effective burner surface
area of the burner plate, wherein the number of through-holes can be chosen as above.
[0030] It is noted that the above stated percentages and ratio apply to at least the effective
burner plate surface area.
[0031] The burner plate of claim 1, enables the passage ratio of the burner plate to be
relatively low, the advantages of which have already been elucidated above. In addition,
this can ensure that the flame positions itself particularly above the burner plate
in the centre thereof, which makes it possible to keep the heat loss of the flame
relatively low.
[0032] As elucidated above, the peripheral edge zone can optionally be provided with non-continuous,
blind holes.
[0033] The peripheral edge zone which is not provided with through-holes of at least the
first pattern can have a depth dimension lying between 30 and 60 mm, more preferably
between 30 and 50 mm, wherein the depth dimension is defined from the peripheral edge
and perpendicularly thereof in the plane of the outlet surface.
[0034] It has been found by applicant that such a depth dimension can be particularly suitable
in the case of the above stated passage ratio. Particularly in the case of a passage
ratio of about 7% the depth dimension can be about 46.5 mm.
[0035] The burner plate can have for instance an overall surface area dimension of about
155 mm in width by about 158 mm in length. The depth dimension of the peripheral edge
zone which is not provided with through-holes of at least the first pattern, i.e.
the about 46.5 mm stated, can here be about 30% of the overall width and/or length.
The peripheral edge zone which is not provided with through-holes of at least the
first pattern can if desired be provided over the whole periphery of the burner plate
so that, as seen in the length and/or width, about 60% of the length and/or width
is not provided with through-holes of the first pattern.
[0036] It is noted that the depth dimension is here defined in the plane of the outlet surface
and is thereby parallel to the length and/or width of the burner plate. The depth
dimension is perpendicular of the height or thickness of the burner plate. The depth
dimension can alternatively be referred to as dimension.
[0037] The through-holes and/or blind holes can have a diameter of about 1.37 mm.
[0038] The peripheral edge zone is wholly free of through-holes, irrespective of the pattern.
[0039] A third pattern of through-holes can alternatively or additionally be disposed in
a part of the peripheral edge zone, particularly a part disposed above an igniter
of the CH boiler and/or a part disposed above an ionization pin of the CH boiler.
[0040] This third pattern can likewise have a determined distance to the periphery of the
burner plate so that a part of the peripheral edge zone which is free of through-holes
is here also provided, although this determined distance, and thereby the depth of
this local peripheral edge zone, can be smaller than the above stated depth dimension.
[0041] It is noted that this third pattern can be arranged to compensate for the igniter
on/or ionization pin.
[0042] The third pattern can particularly be provided in order to create additional passage
relative to the first pattern so as to enable the cold starting, possibly with lean
gases, particularly in the area of the igniter and/or ionization pin.
[0043] The peripheral edge zone can particularly have a greater depth dimension than the
above stated peripheral edge part on which the burner plate is supported. In other
words, according to this embodiment of the burner plate according to the invention,
there is an area close to the periphery of the burner plate which is not supported
and thereby belongs to the effective burner plate surface area, and which is not provided
with through-holes of at least the first pattern, and is preferably wholly free of
through-holes. This area is defined here as the peripheral edge zone.
[0044] In yet another embodiment of the burner plate according to the invention the first
pattern comprises a number of areas, wherein each area has a number of first through-holes
with a maximal mutual first pitch distance, and wherein an area peripheral edge zone
wherein no through-holes are formed is formed all around each area.
[0045] Providing areas with first through-holes and disposing therearound area peripheral
edge zones without through-holes makes it possible to provide a relatively low passage
ratio of the burner plate with thereby a flame front at a relatively great distance
from the burner plate as elucidated above, while a surface area of the flame front
can be relatively large.
[0046] Recirculation can take place between the areas, whereby relatively warm combusted
gases coming from the flame are carried between adjacent areas in the direction of
the burner plate. These relatively warm combusted gases provide for pre-heating of
the supplied non-combusted gas, which can result in an increase in the rate of combustion.
This is particularly advantageous in the case of relatively high speeds of supplied
combustible gas, i.e. in the case of full load, since flame lift-off can hereby be
prevented or at least reduced.
[0047] The term area peripheral edge zone in which no through-holes are formed can at least
be understood to mean that an adjacent through-hole, which is adjacent to the outer
through-holes of an area, has a greater pitch distance to these outer holes than said
maximal mutual first pitch distance of the holes of the areas. Such an adjacent through-hole
can for instance be an outer through-hole of a subsequent area.
[0048] In yet another embodiment of the burner plate according to the invention the areas
are disposed in first rows, wherein each first row has a number of areas and wherein
the burner plate has a number of first rows.
[0049] In each first row the areas can be disposed substantially aligned in line with each
other.
[0050] The adjacent first rows can be disposed substantially parallel to each other as seen
in their longitudinal direction.
[0051] The burner plate can particularly comprise nine first rows with a ten areas each.
[0052] It has been found by applicant that areas with nine through-holes each can be particularly
advantageous. The nine through-holes can here be disposed in three groups of three
through-holes, wherein the through-holes of each group can be disposed parallel to
the longitudinal direction of the first rows. The groups can be disposed offset relative
to each other in the longitudinal direction of the first rows, wherein it is particularly
the middle group which can be disposed offset relative to the two outer groups.
[0053] It is noted that the number of nine through-holes for each area can be particularly
advantageous in the case of a diameter of about 1.37 mm for each through-hole. A different
diameter of the through-holes could result in a different number of through-holes
per area.
[0054] The areas can alternatively also be referred to as islands.
[0055] In yet another embodiment of the burner plate according to the invention the first
pattern comprises a number of second through-holes which are in each case disposed
in a second row parallel to the longitudinal direction of the first rows, particularly
in each case between the first rows, wherein a second pitch distance between the second
through-holes of each second row is greater than the maximal first pitch distance
between the first through-holes in the areas.
[0056] The second through-holes can be provided to reduce emission from the burner plate
between the areas, particularly in that they cool the burner plate locally.
[0057] In each second row the second through-holes can be disposed substantially aligned
in line with each other.
[0058] The second pitch distance can particularly be about twice the first pitch distance,
when the first pitch distance is determined between first holes which are successive
in the longitudinal direction of the first row.
[0059] The first pitch distance between holes which are successive in the longitudinal direction
of the first row can particularly be about 2.13 ± 0.15 mm.
[0060] The second pitch distance can particularly be about 4.26 ± 0.15 mm.
[0061] It is noted that the pitch distance is the centre-to-centre distance between successive
holes.
[0062] It is further noted that the first pitch distance between successive first through-holes
as seen obliquely of the longitudinal direction of the first row can be different
than the first pitch distance between first through-holes which are successive as
seen in the longitudinal direction of the first row. The first pitch distance between
successive first through-holes as seen obliquely of the longitudinal direction of
the first row can particularly be smaller than the first pitch distance between first
through-holes which are successive as seen in the longitudinal direction of the first
row. The maximal first pitch distance can therefore be the first pitch distance between
first through-holes which are successive as seen in the longitudinal direction of
the first row.
[0063] The distance between two adjacent first rows, between which a second row can optionally
be disposed, can be about 5.49 ± 1 mm. The distance between the first row and an adjacent
first row is defined here in a transverse direction transversely of the longitudinal
direction of the first rows, in the plane of the burner plate.
[0064] The distance between adjacent areas in a row can be about 2.89 ± 0.5 mm.
[0065] The burner plate can for instance be made of ceramic or any other suitable material.
The material of which the burner plate is made can for instance have an emissivity
of about > 0.5.
[0066] The chosen first pattern and/or second pattern and/or third pattern can be particularly
suitable for a ceramic burner plate.
[0067] In yet another embodiment of the burner plate according to the invention the burner
plate comprises at least two burner plate parts which are disposed against each other
in use so as to together form substantially one continuous burner plate.
[0068] Providing a plurality of burner plate parts which together form a burner plate can
be advantageous from a production engineering viewpoint.
[0069] A connecting joint or abutting joint, which preferably has the smallest possible
dimension, can be present between the burner plate parts.
[0070] With a view to production costs, the at least two burner plate parts preferably take
a symmetrical form, optionally with the exception of the third pattern.
[0071] The at least two burner plate parts are preferably embodied such that at least the
first pattern, and optionally the second pattern and/or third pattern, runs continuously
over the connecting joint or abutting joint between the at least two burner plate
parts, particularly without an offset between the first pattern and/or second pattern
and/or third pattern of the two burner plate parts in the longitudinal direction of
the rows and/or transversely of the longitudinal direction of the rows.
[0072] In particular, the at least two burner plate parts can preferably be embodied such
that a distance between successive areas and/or successive second holes of respectively
a first and second row on either side of the connecting joint or abutting joint is
equal to a distance between successive areas and/or successive second holes of respectively
a first and second row on one and the same burner plate part.
[0073] It is noted that the dimensions and/or numbers stated above and possibly below can
be chosen in accordance with the CH boiler in which the burner plate will be received
and that they are therefore not limitative to the specific embodiments given.
[0074] It is noted that designations such as "first", "second", "third" and so on are used
as distinction, but that this must not be interpreted as being limitative.
[0075] The invention further relates to an assembly of a burner plate according to any one
of the claims 1-13 and/or as described above and/or below on the basis of one or more
exemplary embodiments and/or with one or more of the features stated above and/or
below, in any random suitable combination, and a CH boiler.
[0076] The invention relates particularly to an assembly of a burner plate according to
any one of the claims 1-13 and/or as described above and/or below on the basis of
one or more exemplary embodiments and/or with one or more of the features stated above
and/or below, in any random suitable combination, and a CH boiler, wherein the burner
plate is accommodated in the CH boiler and is supported at a peripheral edge part
by a support, and wherein the burner plate has an effective total outlet surface area
which is defined as the total outlet surface area of the burner plate minus the peripheral
edge part.
[0077] The burner plate can for instance be accommodated in a housing of the CH boiler.
[0078] The invention will be further elucidated with reference to figures, wherein:
- figures 1-4 show a burner plate part according to the invention in schematic view,
wherein figure 1 shows a perspective top view; figure 2 a top view, figure 3 a vertical
cross-section and figure 4 a bottom view;
- figure 5 shows a burner plate formed by two burner plate parts in schematic top view.
[0079] Figures 1-4 show a burner plate part 1 according to an embodiment of the invention.
The burner plate part according to the invention can form together with a second burner
plate part a burner plate of a CH boiler, as will be further elucidated below with
reference to figure 5.
[0080] Burner plate part 1 comprises a first pattern 2 of through-holes 3 arranged therein,
which through-holes 3 extend between a first, inlet surface 4 and a second, opposite
outlet surface 5 of burner plate part 1. In normal use the first, inlet surface 4
will be disposed on the upper side and the second, outlet surface 5 on the underside.
Figure 2 therefore shows the inlet surface 4, and figure 4 shows the outlet surface
5. Figure 3 is a cross-section between inlet surface 4 and outlet surface 5. During
use a combustible gas, such as for instance natural gas, will be supplied to the inlet
surface side and flow via through-holes 3 to the outlet surface side. Through-holes
3 form here an open, permeable surface part of the total outlet surface 5 of the burner
plate part, more particularly of the effective outlet surface area 5. The term effective
outlet surface area can at least be understood to mean the part of outlet surface
5 which is clear and/or is not blocked by for instance a support for supporting the
burner plate. A passage ratio is here defined as the percentage of the (effective)
outlet surface 5 which is permeable to combustible gas relative to the total (effective)
outlet surface 5, wherein the permeable part of the (effective) outlet surface is
thus formed by the through-holes 3. The combustible gas flowing through the through-holes
3 will combust above the burner plate in a flame front during use.
[0081] As can be seen in figure 2 and other figures, the passage ratio of burner plate 1
is relatively low. The passage ratio of the effective surface area of the whole burner
plate, this comprising burner plate part 1 and a second burner plate part 20, see
figure 5, can particularly be about 7%.
[0082] The effective surface area of the burner plate is the part of the burner plate which
is clear and/or is not blocked by for instance a support for supporting the burner
plate. It can be seen in figures 1 and 2 that recesses 30, in which a support (not
shown) can be arranged, are provided on outlet surface 5 of the burner plate. The
effective outlet surface area is the area 31 of outlet surface 5, i.e. the total surface
area of outlet surface 5 minus the surface area of recesses 30.
[0083] In this exemplary embodiment through-holes 3 are disposed in a first pattern 2 and
a third pattern 6. It is noted that the third pattern 6 is in this exemplary embodiment
provided to compensate for an igniter and/or ionization pin of the CH boiler which
is disposed in this area of the burner plate. If this need not be compensated for,
it is possible that burner plate part 1 only has the first pattern 2 of through-holes
3. With a view to a simple production and symmetry, both burner plate parts 1, 20
can however have through-holes 3 of the third pattern 6, as is also apparent from
figure 5.
[0084] In this example the first pattern 2 comprises a number of areas 7, each with nine
through-holes 3. Formed around each area 7 is an area peripheral edge zone 8 in which
no through-holes are formed. Areas 7 are disposed in first rows, wherein the longitudinal
direction of the first rows in figure 2 is designated with numeral 9. Each first row
of burner plate part 1 comprises five areas 7, and there are nine first rows in total.
The through-holes 3 in each area 7 have a mutual pitch distance 10, 11. In a direction
parallel to the longitudinal direction 9 of the first rows the pitch distance 10 between
successive through-holes 3 is about 2.13 ± 0.15 mm. In a direction obliquely of longitudinal
direction 9 of the first rows the pitch distance 11 between successive through-holes
3 is about 2.02 ± 0.15 mm. The maximal pitch distance between successive, adjacent
through-holes 3 of each area is therefore about 2.13 ± 0.15 mm in this example. The
term area peripheral edge zone 8 in which no through-holes 3 are formed is here at
least understood to mean that a through-hole 3 adjacent to an area 7, which through-hole
3 is thus not associated with the one area 7 and which is adjacent to the outer through-holes
3 of an area 7, has a greater pitch distance to these outer through-holes 3 than the
stated maximal first pitch distance of about 2.13 ± 0.15 mm between the through-holes
3 in areas 7. Such an adjacent through-hole can for instance be an outer through-hole
3 of a subsequent area 7. The distance 12 between adjacent first rows is in this example
about 5.49 ± 1 mm.
[0085] The first pattern 2 further comprises in this example a number of second through-holes
3 which are in each case disposed in a second row parallel to the longitudinal direction
9 of the first rows, particularly in each case between the first rows. A second pitch
distance 13 between the second through-holes 3 of each second row is in this example
greater than the first pitch distance 10, 11 between the first through-holes 3 in
areas 7. The second pitch distance 13 is particularly about 4.26 ± 0.15 mm, i.e. about
twice the maximal first pitch distance 10.
[0086] The third pattern 6 comprises a number of through-holes 3 which are disposed locally
to compensate for an igniter and/or ionization pin (not shown) present in the CH boiler
in this area. These through-holes 3 locally provide an additional passage for combustible
gas, so that the combustible gas can easily ignite into a flame, particularly in the
case of a cold start.
[0087] Provided all around first pattern 2 is a peripheral edge zone 14 which is free of
through-holes 3 of at least the first pattern 2. This peripheral edge zone 14 has
a depth dimension 15 of about 46.5 mm, wherein the depth dimension is defined in outlet
surface 5, perpendicularly of peripheral edge 17, from peripheral edge 17 up to the
through-holes 3 of first pattern 2.
[0088] As is apparent from figure 2 and other figures, third pattern 6 is disposed in peripheral
edge zone 14 so that, in the area of third pattern 6, peripheral edge zone 14 does
have through-holes 3 of the third pattern 6. A part of peripheral edge zone 14 is
here however also wholly free of through-holes 3, at least over a depth dimension
16, which is defined here in outlet surface 5, perpendicularly of peripheral edge
17, from peripheral edge 17 up to the through-holes 3 of third pattern 6.
[0089] As can further be seen in figure 2, peripheral edge zone 14 has a greater depth dimension
15 than recesses 30, wherein the depth dimension is here also defined in outlet surface
5, perpendicularly of peripheral edge 17. In other words, in this embodiment there
is an area close to peripheral edge 17 of the burner plate which is not supported
and thereby belongs to the effective burner plate surface area, and which is not provided
with through-holes of at least the first pattern 2, and is in this embodiment even
wholly free of through-holes.
[0090] Outlet surface 5 is shown in figure 4. This shows that a large part of outlet surface
5, particularly substantially the whole outlet surface 5, is provided with holes.
Some of these holes are the through-holes 3 of first pattern 2 and third pattern 6.
The other holes are non-continuous, blind holes 18, as can also be seen in figure
3. These blind holes 18 extend from the outlet surface side in the direction of inlet
surface 4, but not all the way up to inlet surface 4, so that they are blind, i.e.
not open, at inlet surface 4. These blind holes 18 form a second pattern of blind
holes.
[0091] The ratio between through-holes and blind holes is in this exemplary embodiment 1
: 3.7.
[0092] Figure 5 shows a burner plate with the burner plate part 1 and another burner plate
part 20. The other burner plate part 20 is embodied substantially symmetrically and/or
identically to burner plate part 1. Burner plate parts 1 and 20 are disposed mutually
abutting with a side thereof against each other, so that together they form a substantially
through-running or continuous burner plate. The abutting sides of burner plate parts
1, 20 are particularly the long sides thereof, which long sides are disposed in a
plane perpendicularly of the surfaces 4, 5. The first rows and second rows of burner
plate parts 1, 20 are disposed aligned in the longitudinal direction 9 of the first
rows, so that they run on substantially in a continuous row or line. A connecting
joint or abutting joint 21 between burner plate parts 1, 20 is preferably a small
as possible, so that burner plate parts 1, 20 are substantially continuous. The inlet
surfaces 4 and outlet surfaces 5 of burner plate parts 1, 20 particularly form substantially
one continuous surface.
[0093] It is noted that optionally both burner plate parts 1, 20 or one of the two burner
plate parts 1, 20, for instance the other burner plate part 20, can if desired have
no through-holes 3 of the third pattern 6, for instance because an igniter and/or
ionization pin need not be compensated for.
[0094] It is noted that the invention is not limited to the shown embodiments but also extends
to variants within the scope of the appended claims.
[0095] All stated dimensions thus serve only as example, and can be chosen as desired.
1. Burner plate for a central heating boiler, which burner plate comprises a first pattern
(2) of through-holes (3) arranged therein, which through-holes (3) extend between
a first, inlet surface (4) and a second, opposite outlet surface (5) of the burner
plate, and which holes are configured to allow passage of a combustible gas from the
inlet surface (4) to the outlet surface (5) and thus form a permeable surface part
of the total outlet surface (5) of the burner plate, wherein a peripheral edge zone
(14) of the burner plate has no through-holes (3), characterized in that
and the peripheral edge zone (14) of the burner plate has a depth dimension (15, 16)
lying between 30 and 60 mm, wherein the depth dimension (15, 16) is defined from a
peripheral edge (17) and perpendicularly thereof in the plane of the outlet surface
(5).
2. Burner plate according to claim 1, wherein the permeable surface part comprises less
than 15% of the total outlet surface (5) of the burner plate, preferably less than
12%, more preferably less than 10%, still more preferably about 7%.
3. Burner plate according to claim 1 or 2, wherein the permeable surface part comprises
more than 3% of the total outlet surface (5) of the burner plate, preferably more
than 5%.
4. Burner plate according to any one of the foregoing claims, wherein the burner plate
comprises a second pattern of non-continuous, blind holes (18).
5. Burner plate according to claim 4, wherein the number of through-holes (3) relative
to the total number of through- and blind holes (3, 18) is a maximum of 35%, preferably
a maximum of 30%, more preferably a maximum of 25%, more preferably about 21%.
6. Burner plate according to claim 4 or 5, wherein the number of through-holes (3) relative
to the total number of through- and blind holes (3, 18) is a minimum of 10%, preferably
a minimum of 15%, more preferably a minimum of 20%.
7. Burner plate according to any one of the foregoing claims, wherein the first pattern
(2) comprises a number of areas (7), wherein each area (7) has a number of first through-holes
(3) with a mutual first pitch distance (10, 11), and wherein an area peripheral edge
zone (8) wherein no through-holes (3) are formed is formed all around each area (7).
8. Burner plate according to claim 7, wherein the areas (7) are disposed in first rows,
wherein each first row has a number of areas (7) and wherein the burner plate has
a number of first rows.
9. Burner plate according to claim 8, wherein the first pattern (2) comprises a number
of second through-holes (3) which are in each case disposed in a second row parallel
to the longitudinal direction (9) of the first rows, particularly in each case between
the first rows, wherein a second pitch distance (13) between the second through-holes
(3) of each second row is greater than the first pitch distance (10, 11) between the
first through-holes (3) in the areas (7).
10. Burner plate according to any one of the foregoing claims, wherein the burner is made
of ceramic material.
11. Burner plate according to any one of the foregoing claims, wherein the burner plate
comprises at least two burner plate parts (1, 20) which are disposed against each
other in use so as to together form substantially one continuous burner plate.
12. Burner plate according to any one of the foregoing claims, wherein the depth dimension
(15, 16) of the peripheral edge zone (14) of the burner plate lies between 30 and
50 mm.
13. Assembly of a burner plate according to any one of the claims 1-12 and a central heating
boiler.
1. Brennerplatte für einen Zentralheizungskessel, wobei die Brennerplatte ein erstes
Muster (2) von darin angeordneten Durchgangslöchern (3) aufweist, wobei sich die Durchgangslöcher
(3) zwischen einer ersten Einlassfläche (4) und einer zweiten, gegenüberliegenden
Auslassfläche (5) der Brennerplatte erstrecken, wobei die Löcher so ausgebildet sind,
dass sie den Durchgang eines brennbaren Gases von der Einlassfläche (4) zu der Auslassfläche
(5) ermöglichen und somit einen durchlässigen Oberflächenteil der gesamten Auslassfläche
(5) der Brennerplatte bilden, wobei eine periphere Randzone (14) der Brennerplatte
keine Durchgangslöcher (3) aufweist,
dadurch gekennzeichnet, dass
die periphere Randzone (14) der Brennerplatte eine Tiefenabmessung (15, 16) aufweist,
die zwischen 30 und 60 mm liegt, wobei die Tiefenabmessung (15, 16) in der Ebene der
Auslassfläche (5) ab einem Umfangsrand (17) sowie senkrecht dazu definiert ist.
2. Brennerplatte nach Anspruch 1, wobei der durchlässige Oberflächenteil weniger als
15% der gesamten Auslassfläche (5) der Brennerplatte beträgt, vorzugsweise weniger
als 12%, bevorzugter weniger als 10%, noch bevorzugter etwa 7%.
3. Brennerplatte nach Anspruch 1 oder 2, wobei der durchlässige Oberflächenteil mehr
als 3%, vorzugsweise mehr als 5%, der gesamten Auslassfläche (5) der Brennerplatte
beträgt.
4. Brennerplatte nach einem der vorherigen Ansprüche, wobei die Brennerplatte ein zweites
Muster von nicht durchgehenden Sacklöchern (18) aufweist.
5. Brennerplatte nach Anspruch 4, wobei die Anzahl der Durchgangslöcher (3) im Verhältnis
zur Gesamtzahl der Durchgangs- und Sacklöcher (3, 18) maximal 35%, vorzugsweise maximal
30 %, bevorzugter maximal 25 %, noch bevorzugter etwa 21 % beträgt.
6. Brennerplatte nach Anspruch 4 oder 5, wobei die Anzahl der Durchgangslöcher (3) im
Verhältnis zur Gesamtzahl der Durchgangs- und Sacklöcher (3, 18) mindestens 10%, bevorzugter
mindestens 15%, noch bevorzugter mindestens 20% beträgt.
7. Brennerplatte nach einem der vorherigen Ansprüche, wobei das erste Muster (2) eine
Anzahl von Bereichen (7) umfasst, wobei jeder Bereich (7) eine Anzahl von ersten Durchgangslöchern
(3) mit einem gegenseitigen ersten Teilungsabstand (10, 11) aufweist, und wobei eine
Bereichsumfangsrandzone (8), in der keine Durchgangslöcher (3) ausgebildet sind, um
jeden Bereich (7) herum ausgebildet ist.
8. Brennerplatte nach Anspruch 7, wobei die Bereiche (7) in ersten Reihen angeordnet
sind, wobei jede erste Reihe eine Anzahl von Bereichen (7) aufweist und wobei die
Brennerplatte eine Anzahl von ersten Reihen aufweist.
9. Brennerplatte nach Anspruch 8, wobei das erste Muster (2) eine Anzahl von zweiten
Durchgangslöchern (3) aufweist, welche jeweils in einer zur Längsrichtung (9) der
ersten Reihen parallelen zweiten Reihe, insbesondere jeweils zwischen den ersten Reihen,
angeordnet sind, wobei ein zweiter Teilungsabstand (13) zwischen den zweiten Durchgangslöchern
(3) jeder zweiten Reihe größer ist als der erste Teilungsabstand (10, 11) zwischen
den ersten Durchgangslöchern (3) in den Bereichen (7).
10. Brennerplatte nach einem der vorherigen Ansprüche, wobei der Brenner aus keramischem
Material gefertigt ist.
11. Brennerplatte nach einem der vorherigen Ansprüche, wobei die Brennerplatte zumindest
zwei Brennerplattenteile (1, 20) umfasst, die im Gebrauch nebeneinander so angeordnet
sind, dass sie zusammen eine im Wesentlichen durchgehende Brennerplatte bilden.
12. Brennerplatte nach einem der vorherigen Ansprüche, wobei die Tiefenabmessung (15,
16) der peripheren Randzone (14) der Brennerplatte zwischen 30 und 50 mm liegt.
13. Anordnung einer Brennerplatte nach einem der Ansprüche 1 bis 12 und eines Zentralheizungskessels.
1. Plaque de brûleur destinée à une chaudière de chauffage central, laquelle plaque de
brûleur présente un premier motif (2) d'orifices traversants (3) agencés sur celle-ci,
lesquels orifices traversants (3) s'étendent entre une première surface d'entrée (4)
et une seconde surface de sortie (5) opposée de la plaque de brûleur, et lesquels
orifices sont configurés de manière à permettre le passage d'un gaz combustible à
partir de la surface d'entrée (4) vers la surface de sortie (5) et forment ainsi une
partie de surface perméable de la surface totale de sortie (5) de la plaque de brûleur,
dans laquelle une zone de bord périphérique (14) de la plaque de brûleur ne comporte
aucun orifice traversant (3), caractérisée en ce que
la zone de bord périphérique (14) de la plaque de brûleur présente une dimension de
profondeur (15, 16) comprise entre 30 et 60 millimètres, dans laquelle la dimension
de profondeur (15, 16) est définie à partir d'un bord périphérique (17) et perpendiculairement
à celui-ci dans le plan de la surface de sortie (5).
2. Plaque de brûleur selon la revendication 1, dans laquelle la partie de surface perméable
comprend moins de 15% de la surface totale de sortie (5) de la plaque de brûleur,
de préférence, moins de 12%, plus préférablement, moins de 10%, encore plus préférablement,
7% environ.
3. Plaque de brûleur selon la revendication 1 ou 2, dans laquelle la partie de surface
perméable comprend plus de 3% de la surface totale de sortie (5) de la plaque de brûleur,
de préférence, plus de 5 %.
4. Plaque de brûleur selon l'une quelconque des revendications précédentes, dans laquelle
la plaque de brûleur comprend un second motif d'orifices borgnes non continus (18).
5. Plaque de brûleur selon la revendication 4, dans laquelle le nombre d'orifices traversants
(3) par rapport au nombre total d'orifices traversants et borgnes (3, 18) présente
un maximum de 35%, de préférence, un maximum de 30%, plus préférablement un maximum
de 25%, encore plus préférablement, est égal à 21% environ.
6. Plaque de brûleur selon la revendication 4 ou 5, dans laquelle le nombre d'orifices
traversants (3) par rapport au nombre total d'orifices traversants et borgnes (3,
18) présente un minimum de 10%, de préférence, un minimum de 15%, plus préférablement,
un minimum de 20%.
7. Plaque de brûleur selon l'une quelconque des revendications précédentes, dans laquelle
le premier motif (2) comprend un certain nombre de secteurs (7), dans laquelle chaque
secteur (7) comporte un certain nombre de premiers orifices traversants (3) présentant
une première distance d'espacement mutuel (10, 11) et dans laquelle une zone de bord
périphérique de secteur (8), dans laquelle il n'est formé aucun orifice traversant
(3), est formée tout autour de chaque secteur (7).
8. Plaque de brûleur selon la revendication 7, dans laquelle les secteurs (7) sont disposés
suivant des premières rangées, dans laquelle chaque première rangée comporte un certain
nombre de secteurs (7) et dans laquelle la plaque de brûleur comporte un certain nombre
de premières rangées.
9. Plaque de brûleur selon la revendication 8, dans laquelle le premier motif (2) comprend
un certain nombre de seconds orifices traversants (3) qui, dans chaque cas, sont disposés
suivant une seconde rangée parallèle à la direction longitudinale (9) des premières
rangées, plus particulièrement, dans chaque cas, entre les premières rangées, dans
laquelle une seconde distance d'espacement (13) entre les seconds orifices traversants
(3) de chaque seconde rangée est supérieure à la première distance d'espacement (10,
11) entre les premiers orifices traversants (3) dans les secteurs (7).
10. Plaque de brûleur selon l'une quelconque des revendications précédentes, dans laquelle
le brûleur est réalisé en un matériau céramique.
11. Plaque de brûleur selon l'une quelconque des revendications précédentes, dans laquelle
la plaque de brûleur comprend au moins deux parties de plaque de brûleur (1, 20) qui
sont disposées l'une contre l'autre en utilisation afin de former ensemble une plaque
de brûleur sensiblement continue.
12. Plaque de brûleur selon l'une quelconque des revendications précédentes, dans laquelle
la dimension de profondeur (15, 16) de la zone de bord périphérique (14) de la plaque
de brûleur est comprise entre 30 et 50 millimètres.
13. Ensemble d'une plaque de brûleur selon l'une quelconque des revendications 1 à 12
et d'une chaudière de chauffage central.