Technical Field
[0001] The present invention relates to a flame hole unit structure of a gas burner, and
more particularly, to a flame hole unit structure of a gas burner in which a structure
of a burner flame hole unit can be simplified and the unit can be easily assembled
and manufactured by overlapping cut portions of a plurality of partially-cut plates
to cross each other to form a mixed gas (gas and air) flow path and a flame hole through
a gap between the cut portions.
Background Art
[0002] In general, a gas burner used in a combustion device such as a boiler or a water
heater may be classified as a Bunsen burner or a pre-mixed burner according to a method
of mixing a combustion gas with air.
[0003] The Bunsen burner is a burner that supplies a minimum of primary air required for
combustion in a nozzle unit through which a gas is injected, and supplies excessive
secondary air to a portion at which a flame is formed, realizing perfect combustion,
and has an advantage of good combustion stability. However, since the flame is formed
by the secondary air, a flame length may be increased.
[0004] The pre-mixed burner combusts a pre-mixed gas in which a combustion gas and air are
pre-mixed in a mixing chamber. Since the entire flame length can be reduced and a
flame temperature can be lowered to reduce a load with respect to the same area, generation
of pollutants such as carbon monoxide, nitrogen oxide, and so on, can be reduced to
a minimum value.
[0005] While the Bunsen burner is mainly used in the conventional art, in recent times,
a pre-mixed burner has mainly been used to reduce generation of pollutants and miniaturize
a combustion chamber.
[0006] FIG. 1 is a perspective view showing an example of a conventional flame hole unit
structure of a gas burner.
[0007] A conventional pre-mixed type gas burner 1 has a structure in which air supplied
from a blower 30 and a combustion gas supplied through a gas supply pipe 40 are pre-mixed
in a manifold 50 installed at a front surface of a burner body 20 to be supplied to
a burner flame hole unit 10 installed over the burner body 20.
[0008] While the conventional burner flame hole unit 10 has a structure in which flame holes
are punched in one plate having a flat or cylindrical shape, such a structure may
cause imperfect combustion and backfire when a combustion surface of the burner is
deformed or, in a severe case, damage to the flame holes occurs due to thermal stress.
[0009] In order to compensate for these disadvantages, a burner flame hole unit structure
formed of a material such as a metal fiber mat woven of a metal fiber, a ceramic plate
manufactured by sintering ceramic, or the like, has been used.
[0010] However, according to the flame hole unit structure formed of the metal fiber mat
or the ceramic plate, a material cost is increased and a manufacturing method is complicated,
which increases a manufacturing cost, and a structure of a pre-mixer is complicated,
which increase a pressure loss so that a flame becomes unstable and noises occur.
[0011] In addition, when the metal fiber mat manufactured through weaving is used as a material
for the flame hole unit, since an operator pulls and assembles the metal fiber mat
upon assembly of the burner, irregular sizes of the flame holes in a local area or
the entire area of the metal fiber mat may cause imperfect combustion and backfire,
and flexibility in material characteristics of the metal fiber mat may cause sagging
after installation, irregularly deforming the combustion surface and the flame holes.
[0012] Further, in the case in which the ceramic plate manufactured through the sintering
method is used as a material for the flame hole unit, when condensation water generated
from a heat exchanger upon upward combustion is dropped on the combustion surface,
a surface of the flame hole unit may be damaged due to water to generate the flame
holes having irregular shapes, increasing probability of generation of imperfect combustion.
Technical Problem
[0013] In order to solve the foregoing and/or other problems, it is an aspect of the present
invention to provide a flame hole unit structure of a gas burner in which a structure
of a burner flame hole unit can be simplified and the structure can be easily manufactured.
Technical Solution
[0014] The foregoing and/or other aspects of the present invention may be achieved by providing
a flame hole unit structure of a gas burner having a plurality of flame holes through
which a mixed gas of a gas and air is injected to form a flame, characterized in that
a plurality of partially cut plates overlap, the cutout portions of the adjacent plates
overlap across each other, and a mixed gas (the gas and air) flow path and the flame
holes are formed through gaps of the cutout portions.
[0015] Here, the plurality of plates may include a plurality of overlapping sets of plates,
each set including an inner plate having a partially cut upper or lower groove and
outer plates overlapping at both sides of the inner plate and having partially cut
upper and lower grooves corresponding to the groove formed in the inner plate to cross
each other.
[0016] In addition, fixing plates may additionally overlap at both sides of the set of plates
so that the plurality of flame holes are disposed at predetermined intervals.
[0017] Further, the flame hole may have a flat rectangular cross-sectional shape.
Advantageous Effects
[0018] According to the flame hole unit structure of the gas burner of the present invention,
a plurality of partially-cut plates overlap to form the burner flame hole unit so
that a structure of the burner flame hole unit can be simplified and the structure
can be easily manufactured, and thus, time and cost consumed for manufacture of the
gas burner can be reduced.
[0019] In addition, according to the present invention, as the moving path of the mixed
gas and the structure in communication with the flame holes are formed in the gap
between the overlapping plates, a deformation level of the flame holes due to thermal
stress can be reduced to increase stability of the flame and prevent imperfect combustion.
Description of Drawings
[0020] The above and other aspects and advantages of the present invention will become apparent
and more readily appreciated from the following description of exemplary embodiments,
taken in conjunction with the accompanying drawings of which:
FIG. 1 is a perspective view showing an example of a conventional flame hole unit
structure of a gas burner;
FIG. 2 is a perspective view of a flame hole unit structure of a gas burner in accordance
with an exemplary embodiment of the present invention;
FIG. 3 is a partially exploded perspective view of FIG. 2;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 2;
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 2; and
FIG. 8 is a cross-sectional view taken along line E-E of FIG. 2.
<Description of Major Reference Numerals>
[0021]
1: Gas burner 10, 100: Burner flame hole unit
111 a, 121 a, 122a: Groove 20: Burner body
30: Blower 40: Manifold
110, 111, 112, 113: Inner plate
120, 121, 122, 123, 124, 125, 126: Outer plate
130, 131, 132, 133, 134: Fixing plate
140, 141, 142, 143, 144, 145, 146: Mixed gas inlet port
150, 151, 152, 153: Inner space
160, 161, 162, 163: Flame hole
Mode for Invention
[0022] Reference will now be made in detail to the embodiments of the present invention,
examples of which are illustrated in the accompanying drawings. However, it will be
apparent to those skilled in the art that the following embodiments can be readily
understood and modified into various types, and the scope of the present invention
is not limited to the embodiments.
[0023] FIG. 2 is a perspective view of a flame hole unit structure of a gas burner in accordance
with an exemplary embodiment of the present invention, FIG. 3 is a partially exploded
perspective view of FIG. 2, FIG. 4 is a cross-sectional view taken along line A-A
of FIG. 2, FIG. 5 is a cross-sectional view taken along line B-B of FIG. 2, FIG. 6
is a cross-sectional view taken along line C-C of FIG. 2, FIG. 7 is a cross-sectional
view taken along line D-D of FIG. 2, and FIG. 8 is a cross-sectional view taken along
line E-E of FIG. 2.
[0024] A flame hole unit 100 of a gas burner in accordance with the present invention has
a structure in which a plurality of thin plates overlap and are assembled, and is
characterized in that a path through which a mixed gas of a gas and air moves is formed
inside the overlapping plates to be in communication with upper flame holes.
[0025] Referring to FIGS. 2 and 3, a burner flame hole unit 100 in accordance with an exemplary
embodiment of the present invention includes inner plates 110 (111, 112 and 113) in
which a plurality of grooves 111 a having partially cut upper portions are formed
at predetermined intervals, and outer plates 120 (121, 122, 123, 124, 125 and 126)
in which a plurality of grooves 121 a and 122a having partially cut lower portions
are formed at predetermined intervals to be vertically symmetrical to the grooves
111 a formed in the inner plates 110, and overlap and are coupled to both surfaces
of the inner plates 110.
[0026] As shown, the grooves 111 a, 121 a and 122a are cut in substantially a "C" shape
to be opened upward or downward so that, in a state in which the inner plates 110
and the outer plates 120 overlap, the grooves 111 a formed in the inner plates 110
are in partial communication with the grooves 121 a and 122a formed in the outer plates
120 to form a flow path of the mixed gas.
[0027] Meanwhile, as shown in FIG. 3, the inner plate 111 and the outer plates 121 and 122
disposed at both sides of the inner plate 111 to overlap configure a set of plates,
and sets of plates overlap to be repeatedly disposed in a multi-stage.
[0028] In addition, solid fixing plates 130 (131, 132, 133 and 134) overlap and are coupled
between the sets of plates.
[0029] The fixing plates 130 perform a function of forming gaps between flame holes 160
(161, 162 and 163) when the plates have different thicknesses, in addition to a function
of forming the flow path of the mixed gas.
[0030] Here, mixed gas inlet ports 140 (141, 142, 143, 144, 145 and 146) are formed at a
lower side of the burner flame hole unit 100 by gaps of the grooves 121 a and122a
of the outer plates 120 between the fixing plates 130 and the inner plates 110.
[0031] The mixed gas introduced into the mixed gas inlet ports 140 is conveyed upward to
be gathered in inner spaces 151, 152 and 153 defined by the gaps of the grooves 111
a of the inner plates 110 and the grooves 121 a and 122a of the outer plates 120 between
the fixing plates 130.
[0032] In addition, the mixed gas gathered in the inner spaces 151, 152 and 153 is conveyed
upward to be injected upward through flame holes 160 (161, 162 and 163) formed by
gaps of the grooves 111 a of the inner plates 110 between the outer plates 120.
[0033] According to the above-mentioned configuration, since the mixed gas introduced through
the two mixed gas inlet ports 141 and 142 is injected through the one flame hole 161
and a cross-sectional area of the flame hole 161 is smaller than that of the inner
space 151, the mixed gas can be rapidly injected through the flame hole 161.
[0034] Meanwhile, while the embodiment has been described as an example in which the grooves
111 a formed in the inner plates 110 are opened upward and the grooves 121 a and 122a
formed in the outer plates 120 are opened downward, on the other hand, the grooves
111 a formed in the inner plates 110 and the grooves 121 a and 122a formed in the
outer plates 120 may be opened downward and upward, respectively, in different directions.
According to such a configuration, the mixed gas introduced into the one mixed gas
inlet port is divided into the two flame holes to be injected.
[0035] In FIG. 6, reference numerals 141 a to 146c designate mixed gas inlet ports formed
in a lateral direction, in FIG. 7, reference numerals 151a to 153c designate inner
spaces formed in the lateral direction, and in FIG. 8, reference numerals 161a to
163c designate flame hole units formed in the lateral direction.
[0036] According to the flame hole unit structure of the gas burner in accordance with the
present invention, since the plurality of plates overlap to form the path of the mixed
gas to be in communication with the upper flame holes, deformation of the flame holes
due to thermal stress can be minimized.
[0037] In addition, while the embodiment has a configuration in which the three sets of
plates overlap, the number of sets of plates may be differently configured in consideration
of a maximum output amount of the gas burner.
[0038] The foregoing description concerns an exemplary embodiment of the invention, is intended
to be illustrative, and should not be construed as limiting the invention. The present
teachings can be readily applied to other types of devices and apparatuses. Many alternatives,
modifications, and variations within the scope and spirit of the present invention
will be apparent to those skilled in the art.