U.S. patent application number 13/873891 was filed with the patent office on 2013-10-31 for premix combustion device of gas burner.
This patent application is currently assigned to Daesung Industrial Co., Ltd.. The applicant listed for this patent is DAESUNG INDUSTRIAL CO., LTD.. Invention is credited to Hyun Sang Kim, Myung Hoon Lee.
Application Number | 20130284115 13/873891 |
Document ID | / |
Family ID | 49476234 |
Filed Date | 2013-10-31 |
United States Patent
Application |
20130284115 |
Kind Code |
A1 |
Kim; Hyun Sang ; et
al. |
October 31, 2013 |
PREMIX COMBUSTION DEVICE OF GAS BURNER
Abstract
A premix combustion device of a gas burner applicable to a
domestic gas boiler or water heater, includes a gas mixture supply
pipe to supply gas mixture to the gas burner, and a gas supply and
an air supply connected with the gas mixture supply pipe. A damper
is provided at a predetermined position in the gas mixture supply
pipe to regulate the amount of the gas mixture to be supplied to
the gas burner, the degree of opening of the damper is adjusted by
an electrically operated valve controlled by a control signal from
a controller, and a valve disc arranged to open and close the gas
mixture supply pipe according to operation of the valve is provided
with a plurality of holes.
Inventors: |
Kim; Hyun Sang; (Daejeon,
KR) ; Lee; Myung Hoon; (Buchun, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DAESUNG INDUSTRIAL CO., LTD. |
Seoul |
|
KR |
|
|
Assignee: |
Daesung Industrial Co.,
Ltd.
Seoul
KR
|
Family ID: |
49476234 |
Appl. No.: |
13/873891 |
Filed: |
April 30, 2013 |
Current U.S.
Class: |
122/14.21 |
Current CPC
Class: |
F23N 1/022 20130101;
F24H 9/2035 20130101; F23D 14/60 20130101 |
Class at
Publication: |
122/14.21 |
International
Class: |
F24H 9/20 20060101
F24H009/20 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 30, 2012 |
KR |
2020120003532 |
Claims
1. A premix combustion device of a gas burner applicable to a
domestic gas boiler or water heater, comprising: a gas mixture
supply pipe to supply a gas mixture to the gas burner; and a gas
supply and air supply connected with the gas mixture supply pipe,
wherein a damper is provided at a predetermined position in the gas
mixture supply pipe to regulate an amount of the gas mixture to be
supplied to the gas burner.
2. The premix combustion device according to claim 1, wherein a
degree of opening of the damper is adjusted by an electrical valve
operated by a control signal from a controller, and wherein a valve
disc is configured to open and close the gas mixture supply pipe
according to the adjustment of the electrical valve, and wherein
the valve disc includes a plurality of holes.
3. The premix combustion device according to claim 1, wherein a
degree of opening of the damper is adjusted by a pressure valve
having a valve disc selectively positioned by a spring according to
a fluid pressure provided by the air supply, and wherein the valve
disc is configured to open and close the gas mixture supply pipe
according to the adjustment of the pressure valve, and wherein the
valve disc includes a plurality of holes.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a premix combustion device
of a gas burner, and more particularly to a premix combustion
device of a gas burner having a gas mixture damper which can extend
the range of controllable combustion by controlling the amount of
premix gas formed by mixing air and combustible gas, by adjusting
the degree of opening of the gas mixture damper.
BACKGROUND OF THE INVENTION
[0002] Combustion systems applicable to a general domestic boiler
or water heater include a premix combustion system and a Bunsen
combustion system. Among the combustion systems, the premix
combustion system can maintain a constant air-to-gas ratio and
reduce excessive air, thereby increasing efficiency of the system
and reducing the amount of exhaust gas.
[0003] For the premix combustion system, in which the amount of gas
to be mixed with air is determined according to the amount of air,
the range of controllable combustion depends on the performance of
the air supply fan which regulates the amount of air. The
combustion system has a turn down ratio (TDR), which refers to the
ratio of the minimum work to maximum work which can be controlled
by the combustion system. A combustion system having a high TDR is
advantageous in that it can supply heating water and hot water at a
set temperature under any heat load condition.
[0004] For the conventional premix combustion system as above in
which the amount of gas is determined by the pressure generated by
the air supply fan, however, the TDR determined according to the
performance of the fan is merely 1:5. Thus, the conventional
combustion system fails to ensure that the water is supplied at a
set temperature under various conditions of heat load such as a low
flow rate and a narrow range of temperature rise, since it cannot
properly control combustion operation under these conditions.
[0005] A prior art technique proposed to solve such problem is
known from Korean Patent No. 0181016 (Title: "SUPPLYING SYSTEM AND
CONTROL METHOD FOR PREMIXED FUEL ON GAS BOILER"). The technique
proposes adjusting the proportion of gas to be mixed with air based
on a measured value of pressure difference produced by a damper
installed in a supply path of a gas mixture. However, the damper
provided in the supply path of the gas mixture is simply adapted to
passively produce pressure difference in moving air, and thus
cannot actively adjust the pressure difference or the amount of gas
mixture supplied to the burner, and thereby a separate control
means needs to be provided.
SUMMARY OF THE INVENTION
[0006] Therefore, the present invention has been made in view of
the above problems, and it is an object of the present invention to
provide a premix combustion device of a gas burner which can
maintain a constant water supply temperature under various
conditions of heat load by adjusting the degree of opening of a gas
mixture damper to regulate the amount of premix gas formed by
mixing air and combustion gas, thereby extending the range of
controllable combustion.
[0007] In accordance with the present invention, the above and
other objects can be accomplished by the provision of a premix
combustion device of a gas burner applicable to a domestic gas
boiler or water heater, comprising a gas mixture supply pipe to
supply gas mixture to the gas burner; and a gas supply means and
air supply means connected with the gas mixture supply pipe,
wherein a damper is provided at a predetermined position in the gas
mixture supply pipe to regulate the amount of the gas mixture to be
supplied to the gas burner.
[0008] The degree of opening of the damper provided at the
predetermined position in the gas mixture supply pipe to regulate
the amount of the gas mixture to be supplied to the gas burner may
be adjusted by an electrically operated valve controlled by a
control signal from a controller. A valve disc may be arranged to
open and close the gas mixture supply pipe according to operation
of the valve, and is provided with a plurality of holes.
[0009] The degree of opening of the damper provided at the
predetermined position in the gas mixture supply pipe to regulate
the amount of the gas mixture to be supplied to the gas burner is
adjusted by a pressure adjusting valve having a valve disc
elastically installed by a spring according to fluid pressure. The
valve disc is arranged to open and close the gas mixture supply
pipe according to operation of the valve, and is provided with a
plurality of holes.
[0010] These and other features, advantages, and objects of the
present invention will be further understood and appreciated by
those skilled in the art by reference to the following
specification, claims, and appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1(a) is a view schematically illustrating the
configuration of a premix combustion device of a gas burner
according to an exemplary embodiment of the present invention with
the damper in a closed state;
[0012] FIG. 1(b) is a view of the premix combustion device of FIG.
1(a) with the damper in the open state;
[0013] FIG. 2(a) is a view schematically illustrating the
configuration of a premix combustion device of a gas burner
according to another embodiment of the present invention, with the
damper in the closed state; and
[0014] FIG. 2(b) is a view of the premix combustion device of FIG.
2(a) with the damper in the open state.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0015] Preferred embodiments of a premix combustion device of a gas
burner are described in detail with reference to the accompanying
drawings.
[0016] FIG. 1 is a view schematically illustrating the
configuration of a premix combustion device of a gas burner
according to one embodiment of the present invention, in which FIG.
1(a) illustrates a damper in a closed state and FIG. 1(b)
illustrates the damper in an open state.
[0017] The premix combustion device of a gas burner applicable to a
domestic gas boiler or water heater includes a gas mixture supply
pipe 20 to supply premix gas to the gas burner 10, and a gas supply
means 30 and air supply means connected with the gas mixture supply
pipe 20. A damper is provided at a predetermined position in the
gas mixture supply pipe to regulate the amount of premix gas to be
supplied to the gas burner.
[0018] The premix combustion device performs combustion of a
gaseous fuel in which the fuel (gaseous fuel) and air (primary air)
are premixed before being supplied to the burner where the premix
gas is burned. As the fuel and air are premixed, the premix flame
generated through the premix combustion device obtains a good
quality blue flame which produces less CO and has a uniform and low
flame temperature with low production of NO.sub.x. Also, the short
length of the flame contributes to realization of a compact
combustion system with a small combustion chamber.
[0019] The gas mixture supply pipe 20 is connected to the gas
burner of the gas boiler or water heater to supply premix gas
formed by mixing air and gas, and a gas supply means 30 and air
supply means 40 are provided at predetermined positions in the gas
mixture supply pipe 20. The gas supply means 30 can include a gas
supply pipe 31 and a valve 32, and the air supply means 40 can
include an air supply fan which is rotated by a motor. A damper is
installed at a predetermined position in the line of the gas
mixture supply pipe 20 to open and close the gas mixture supply
pipe 20.
[0020] The damper provided at a predetermined position in the line
of the gas mixture supply pipe 20 to regulate the amount of gas
mixture to be supplied to the gas burner is configured with an
electrically operated valve 51 and valve disc 52, and the degree of
opening thereof is operated by a control signal from a controller
60. The valve disc 52, which is driven to open and close the gas
mixture supply pipe 20 by operation of the valve 51, is provided
with a plurality of holes 52a functioning to cause a uniform amount
of gas mixture to be supplied to the burner and be completely
burned in normal combustion operation of the burner. The size,
number and position of the holes 52a are preferably determined in
accordance with the capacity and properties of the gas burner.
[0021] In the present invention configured as above, if the heating
power of the gas burner is weak, the air pressure generated by the
air supply means 40 is lowered by the controller 60 to close the
damper as shown in FIG. 1(a). In this case, complete combustion is
ensured by allowing a uniform amount of gas mixture to be supplied
through the holes 52a that are formed in the valve disc 52.
[0022] In the situation as above, when the heating power of the gas
burner is increased, the air pressure generated by the air supply
means 40 is raised by the controller 60 to increase the degree of
opening of the damper to thereby increase the amount of the gas
mixture to be supplied as shown in FIG. 1(a). Thereby, complete
combustion of the gas mixture is ensured with a uniform flame,
regardless of the level of the heating power.
[0023] FIGS. 2a and 2b are views schematically illustrating the
configuration of a premix combustion device of a gas burner
according to another embodiment of the present invention, in which
FIG. 2(a) is a view illustrating a damper in a closed state and
FIG. 2(b) is a view illustrating the damper in an open state.
[0024] In the illustrated embodiment, the degree of opening of the
damper 70, which is arranged at the gas mixture supply pipe 20 so
as to regulate the amount of gas mixture to be supplied to the gas
burner, is adjusted by a pressure adjusting valve having a valve
disc 72 elastically installed by a spring 71, according to fluid
pressure, as shown in FIG. 2. The valve disc 72, which opens and
closes the gas mixture supply pipe 20 through operation of the
spring 71, is provided with a plurality of holes 72a.
[0025] In this case, the damper 70 includes the valve disc 72
shaped in a circular plate and provided with the spring 71
generating predetermined compression and tension force, the
plurality of holes 72a, and a support rod 73, and is installed at a
predetermined position in the line of the gas mixture supply pipe
20 to open and close the gas mixture supply pipe 20. The degree of
opening of the damper 70 is adjusted according to air pressure
generated by the air supply means 40, that is, the air supply fan
controlled by the controller 60. If the amount of air blown by the
air supply means 40 is large and thus the air pressure is high, the
distance between the gas mixture supply pipe 20 and the valve disc
72 is widened to allow a large amount of gas mixture to be supplied
to the burner. If the amount of air blown by the air supply means
40 is small and thus the air pressure is low, the distance between
the gas mixture supply pipe 20 and the valve disc 72 is narrowed to
reduce the amount of gas mixture to be supplied to ensure complete
combustion of the gas mixture.
[0026] In the illustrated embodiment, if the heating power of the
gas burner is weak and thus the air pressure generated by the air
supply means 40 is lowered by the controller 60 as shown in FIG.
2(a), the valve disc 72 is moved forward by the tensional force of
the spring 71 to close the damper 70, and a uniform amount of gas
mixture is supplied through the holes 72a that are formed in the
valve disc 72.
[0027] In the above situation, if the air pressure generated by the
air supply means 40 is raised by a control signal from the
controller 60 to increase the heating power of the gas burner as
shown in FIG. 2(b), the spring 71 is compressed, resulting in
backward movement of the valve disc 72 which in turn raises the
degree of opening of the damper 70 to increase the amount of gas
mixture to be supplied, thereby ensuring complete combustion of the
gas mixture with a uniform flame, regardless of the level of the
heating power.
[0028] As described above, the premix combustion device of the
burner according to embodiments of the present invention is
provided with a gas mixture damper in the path of the gas mixture
through which the gas mixture is supplied to the burner, and allows
regulation of the amount of the gas mixture though adjustment of
the degree of opening of the gas mixture damper at a minimum number
of rotations of the air supply fan ensuring stable operation of the
fan, thereby extending the range of controllable combustion of the
burner applied to a gas boiler or water heater and leading to
complete combustion by the flame of the burner under various
conditions of heat load such as a low flow rate and a narrow range
of temperature rise, ensuring supply of water at a set
temperature.
[0029] As is apparent from the above description, the present
invention provides a premix combustion device of a burner provided
with a gas mixture damper installed in the path of a gas mixture to
supply the gas mixture to the burner, in which the degree of
opening of the gas mixture damper is adjusted with a minimum number
of rotations of the air supply fan ensuring stable operation of the
fan, and thereby the range of controllable combustion of the burner
applied to a gas boiler or water heater is extended, leading to
complete combustion of the gas mixture by the flame of the burner
under various conditions of heat load such as a low flow rate and a
narrow range of temperature rise, ensuring supply of water at a set
temperature.
[0030] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying
claims.
[0031] For example, the embodiments described above employ a
configuration in which the distance between the gas mixture and the
valve disc is adjusted by forward or backward movement of the
damper, but it is also possible to employ another configuration in
which the valve disc of the damper is pivotally arranged to adjust
the opening angle of the damper.
* * * * *