GB2075718A - Method and apparatus for combustion control - Google Patents
Method and apparatus for combustion control Download PDFInfo
- Publication number
- GB2075718A GB2075718A GB8111937A GB8111937A GB2075718A GB 2075718 A GB2075718 A GB 2075718A GB 8111937 A GB8111937 A GB 8111937A GB 8111937 A GB8111937 A GB 8111937A GB 2075718 A GB2075718 A GB 2075718A
- Authority
- GB
- United Kingdom
- Prior art keywords
- combustion
- fuel
- volume
- air
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/085—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/18—Measuring temperature feedwater temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/14—Fuel valves electromagnetically operated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/20—Membrane valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/24—Valve details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/26—Fuel nozzles
- F23N2235/28—Spray fuel nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/30—Pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/06—Liquid fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
Abstract
A method of and an apparatus for combustion control wherein the volume of air for combustion is controlled (13) in accordance with a change (4A, 4B) in the load (6, 9), the volume of air is measured (14), and the volume of fuel for combustion is controlled (18) in accordance with the result of measurement of the volume of air (14), so that control of combustion can be effected in accordance with the change in the load while keeping the ratio of the volume of air for combustion to the volume of fuel for combustion substantially constant. <IMAGE>
Description
SPECIFICATION
Method and apparatus for combustion control
This invention relates to a method of and an apparatus for carrying out combustion control in a forced draft
burner with air for combustion being forcedly supplied and discharged, in which control of combustion is
effected in accordance with changes in the load while the ratio of air for combustion to fuel is kept -substantially constant.
In household heating equipment of the forced draft burner of the prior art, a process of intermittent
combustion has been adopted as means for controlling combustion to cope with changes in the load.
However, this process has raised the problem that the precision with which combustion control is effected is
only +5"C with respect to the set temperature, so that the comfort of the users is spoiled. Moreover, a rise of
no less than 5"C means that more fuel than is necessary is combusted, and this is not desirable from the
point of view of conserving energy. Particularly, a boiler of the hot water storage type is intended to store a
large volume of hot water and keep it at a high temperature with a view to meeting the need of using a large
volume of hot water at a time, so that the temperature of the hot water in the hot water tank is measured at
all times and combustion is started as soon as the temperature of the hot water being drop.Thus this type of
boiler requires improvements more urgently than the aforesaid household heating equipment from the
point of view of energy conservation.
Meanwhile there has hitherto been available, for a combustion system of the forced draft type, a known
combustion control process in which a control valve is actuated by the pressure of air for combustion and
fuel is supplied for combustion in proportion to the amount of operation of the control valve. In this
combustion system, it is only the volume of air that is controlled in accordance with changes in the load.
Thus there has arisen the problem that this combustion system is not desirable because the state of
combustion is greatly influenced by the conditions of outdoor air. For example, a rise in atmospheric
pressure would raise the static pressure at the outlet of the fan, thereby making it impossible to obtain the
desired volume of air. This would result in soot and carbon monoxide being produced when the fuel used is
gas other than natural gas, particularly LPG and butane gas containing a high proportion of carbon, or liquid
fuel. Under these circumstances, one would hesitate to adopt the combustion control system.
This invention has been developed for the purpose of obviating the aforesaid disadvantages of the prior
art. Accordingly the invention has as its object for provision of a method of and apparatus for combustion
control suitable for use in a combustion system of the forced draft type which is free from the production of
soot and carbon monoxide.
This invention is based on the discovery that air has a force of inertia. The outstanding characteristic of the
invention is that the volume of air is first controlled and fuel is supplied for combustion in accordance with
the controlled volume of air. By virtue of this feature, the volume of-air changes smoothly in accordance with
variations in the load, so that the production of soot or carbon monoxide due to- a transient shortage in the
supply of air can be avoided.
Figure 1 is a systematic diagram of one embodiment of the invention which is incorporated in a
combustion system using a liquid fuel;
Figure 2 is a systematic diagram of another embodiment which is incorporated in a combustion system
using a gaseous fuel;
Figure 3 is a sectional view of the gaseous fuel control valve used in the gaseous fuel combustion control
apparatus shown in Figure 2;
Figure 4 is a diagram showing the characteristics of the gaseous fuel control valve shown in Figure 3; and
Figure 5 is a sectional view of another form of gaseous fuel control valve shown in Figure 3.
The invention will now be described by referring to the embodiments shown in the drawings.
Figure 1 shows a hot water storage type boiler using a liquid fuel in which the invention is incorporated.
This combustion system comprises a forced draft burner 1 provided with a main heat exchanger 2 for transmitting heat from a high temperature heat source to a low temperature heat source, and a circulation pump 3 for causing a heat medium to circulatethrough a cycle C for transferring heat to a load. Mounted in
the cycle Care temperature responsive sensors 4A and 4B for sensing the temperature of the heat medium,
an indirect heat exchanger 4 for transferring heat from the heat medium to tap water 5, a radiator 6 for
releasing heat from the heat medium to the space in a room, and three-way valves 7 and 8 for controlling a
hot water supply load and a heating load respectively.Afan 10 supplies to the burner 1 air for combustion
and has an air passage 11 comprising a primary air passage 11A communicating the fan 10 with a carburetor
1A of the burner 1, and a secondary air passage 11 B communicating the fan 10 with the surroundings of the burner 1. The carburetor 1A is a carburetor of the rotary disc atomization type provided with a rotary disc 20
for atomizing the liquid fuel and scattering the atomized particles of liquid fuel. The fan 10 is driven by a
motor 12 which is controlled by a circuit 13 based on signals from the temperature responsive sensors 4A
and 4B mounted in the cycle C. The air passage 11 of the fan 10 has mounted therein. an airflow sensor 14,
such as a hot-wire anemometer.The liquid fuel is contained in a fuel tank 15 provided with a static liquid
level controller 16 and supplied to the burner 1 by a fuel pump 17 controlled by a frequency control circuit 18
which in turn is controlled by a signal from the airflow sensor 14. The numeral 9 designates a supply of hot
water flowing out of the indirect heat exchanger 4.
In operation, the heat medium has heat transferred thereto from gas of high temperature and has its temperature rise to a high value. The heat medium of high temperature releases heat therefrom in the form of heat for supplying hot water or effecting space heating and has its temperature drop. The heat medium of low temperature is returned to the main heat exchanger 2. The temperature of the heat medium in circulation may vary depending on the hot water supply load or heating load. That is, the higher the load, the lower is the temperature sensed by the temperature sensor 4A or 4B.
The operating will be described by referring to the hot water supply temperature. With input (fuel volume) to the burner 1 being constant, the temperature of the heat medium in circulation drops as the volume of hot water supplied increases. If the standard temperature of the heat medium is set beforehand and an attempt is made to keep the temperature of the heat medium at the standard level in spite of changes in the load, it would be necessary to increase the input to the burner 1. Thus the temperature of the heat medium is sensed by the temperature responsive sensor 4A and 4B, and the voltage measured by the temperature responsive sensors is compared with a voltage representing the certain standard temperature of the heat medium at the burner fan motor rpm control circuit 13, to thereby determine the rpm of the burner fan motor 12.In this way, the air volume necessary for combustion is determined before the fuel volume is determined.
The flow rate of air passing to the burner 1 is measured by the airflow sensor 14 which supplies a signal to the frequency control circuit 18. The fuel is supplied to the burner 1 by the fuel pump 17 in a volume which is based on the relation expressed by the following formula. The airflow sensor 14 may be in the form of an electric pressure gauge, although a hot-wire anemometer has been described as being used.
Air Volume Required for Burning Set Fuel Volume (A) = constant (K) ........................................ (1)
Set Fuel Volume (F)
In this formula, the flames generally tend to become yellow in color as the value of A is reduced as compared with that of F, thereby causing soot production. Conversely, the flames tend to become lift flames when the value of A is increased as compared with that of F. When the main heat exchanger 2 is an aluminum heat exchanger having internal fins or a heat exchanger of the plate fin type, the need would arise to avoid obturation with soot produced by the flames.To this end, the value of A is first controlled and then the value of F is determined according to the invention, so that the influences that would be exerted by a lag of F behind A cause the flames to become lift flames, rather than to become yellow in color, to avoid the risk of soot production.
In the embodiment shown and described hereinabove, the positions in which the temperature responding sensors 4A and 4B and the airflow sensor 14 are located may of course be selected in accordance with the objective to be controlled. That is, when the temperature of the supplied hot water is the objective to be controlled, the temperature of the supplied hot water at its outlet may be sensed. Also, when the combustion system is one in which the burner burns fuel entirely with primary air or one in which the primary air volume determines the performance of the burner, the airflow sensor 14 may be disposed in the primary air passage 1 1A. In the embodiment shown and described hereinabove, a carburetor of the rotary disc atomization type has been described as being used as means for atomizing the liquid fuel.It is to be understood that the invention is not limited to this specific form of liquid fuel atomizing means, and that a nozzle atomization system utilizing pressure or a venturi atomization system utilizing air may be used. In carrying the invention into practice, the rotary disc atomization system has been found to be most adequate. The reason for this is that atomization of the liquid fuel can be carried out stably because the centrifugal force remains constant even if the load changes and the fuel volume also changes, since atomization of the liquid fuel is realized in the rotary disc atomization system by utilizing the centrifugal force of the rotary disc whose rpm remains constant.
Figure 2 shows another embodiment which is incorporated in a combustion system using a gaseous fuel.
Parts similar to those shown in Figure 1 are designated by like reference characters. In this embodiment, the process leading to the supply of a signal based on the signal of the airflow sensor 14 to a fuel control valve 23 is similar to the corresponding process followed in the embodiment shown in Figure 1, so that description thereof will be omitted. In the embodiment shown in Figure 2, the gaseous fuel is fed at a predetermined pressure from outside and introduced into an pressure regulator 22 after passing through an electromagnetic valve 21. The function of the pressure regulator 22 is to keep pressure on the secondary side substantially constant without relying on pressure on the primary side. The relative positions of the electromagnetic valve 21 and pressure regulator 22 may be reversed.The fuel released from the pressure regulator 22 at a constant pressure is led to the fuel control valve 23 where the volume of the fuel is controlled in accordance with formula (1), so that the fuel is fed to the burner 1 in a volume commensurate to the air volume.
The fuel control valve 23 may be any one of known types. The fuel control valve 23 shown in Figure 3 as an example is a electromagnetic control valve of the known type which changes the plunger stroke continuously by voltage. The gaseous fuel control valve 30 shown controls the fuel in such a manner that a piston 33 is displaced by the balance between the electromagnetic force produced in an electromagnet 31 by the voltage impressed thereon and the biasing force of a spring 32, to thereby displace a needle 34 coupled to the piston 33, so as to thereby vary the area of an opening 35'in the valve seat to control the volume of fuel. The valve 30 has a gas inlet passage 36 and a gas outlet passage 37.
The gaseous fuel control valve 30 produces hysteresis due to the residual. magnetism in the magnet.
Figure 4 shows the characteristics of the valve. In the diagram shown in Figure 4, the abscissa represents the voltage and the ordinate indicates the plunger stroke. It will be seen that a change inthe load causes a variation in the plunger stroke, and that the influence exerted by the residual magnetism is apparent at a point at which the directions of the strokes change. At this point, there is no change in the displacement of the plunger in spite of the fact that the voltage-is reduced. When the electromagnetic control valve operating in this manner is used, the fuel volume will vary depending on the direction of movement of the plunger, thereby making it impossible to obtain a constant ratio in fuel-air mixtures. The error caused by hysteresis would sometimes be on the order of 200%, thereby placing limits on its usefulness as a control valve.In the diagram shown in Figure 4, a curve I represent the case of a load of 37 g and a curve II indicates the case of the load of 100 g.
The valve 40 shown in Figure 5 has been developed for the purpose of obviating the aforesaid disadvantages of the fuel control valves of the prior art. The feature of the valve 40 is that it relies on an
ON-OFF control process for controlling the fuel. More specifically, the period of time the valve seat is opened is controlled by controlling the length of time for which the valve is ON or the number of times the valve is
ON. The valve seat indicate at 41 and 42 operates such that the movable seat member 41 moved vertically by the electromagnetic force and the force of a spring is brought into and out of contact with the fixed seat member 42, so that when they are in contact with each other the stream of gas is stopped and when they are out of contact with each other the stream of gas is allowed to flow therethrough.Thus by controlling the period of time the two seat members 41 and 42 are in contact with each other and the period of time they are out of contact with each other, it is possible to completely open and close the valve seat. The valve 40 is free from hysteresis which the valve 30 shown in Figure 3 has. In Figure 5, parts similar to those shown in Figure 3 are designated by like reference characters.
it will be appreciated from the foregoing description that the combustion control system according to the invention in which the fuel and air are controlled to obtain a substantially constant fuel-air ratio at all times operates such that the volume of air is first controlled in accordance with a change in the load, the necessary volume of air is measured, and then the volume of fuel to be combusted is controlled based on the measurement of the air volume. By virtue of this feature, the invention is capable of providing a method of and apparatus for carrying out combustion control which are capable of utilizing the force of inertia of air in causing the air volume to change smoothly in accordance with a change in the load, to thereby make it possible to avoid the production of soot and carbon monoxide which might otherwise be caused to occur by a transient lack of air in spite of an increase or decrease of fuel.
Claims (9)
1. A method of combustion control wherein control of combustion is effected in accordance with changes in the load while keeping substantially constant the ratio of the volume of air for combustion to the volume of fuel for combustion, comprising the steps of:
controlling the volume of air in accordance with a change in the load;
measuring the volume of air; and
controlling the volume of fuel in accordance with the measurement of the volume of air.
2. Apparatus for combustion control wherein control of combustion is effected in accordance with changes in the load while keeping substantially constant the ratio of the volume of air for combustion to the volume of fuel for combustion, comprising:
burner;
means for sensing a change in the load;
fan means for feeding air to said burner;
means for controlling drive means for said fan means based on a signal from said sensing means;
airflow measuring means mounted on the discharge side of said fan means for measuring the volume of air commensurate with the change in the load;
means for supplying fuel to said burner; and
control means for effecting control of the fuel based on a signal produced by said airflow measuring means as a result of airflow measurement, to supply from said fuel supply means to said burner the fuel of a volume commensurate with the volume of air measured by said airflow measuring means.
3. Apparatus for combustion control as claimed in claim 2, wherein the fuel is a liquid fuel, and the burner includes a rotary disc atomization type carburetor having a rotary disc for atomizing and spreading the liquid fuel in atomized particles.
4. Apparatus for combustion control as claimed in claim 2, wherein said fuel is a gaseous fuel, and said fuel supply means is an electromagnetic valve of the ON-OFF control system.
5. Apparatus for combustion control as claimed in any one of claims 2-4, wherein said airflow measuring means comprises a hot-wire anemometer.
6. Apparatus for combustion control as claimed in claim 2, wherein said combustion apparatus is of the forced draft type.
7. Apparatus for combustion control as claimed in claim 6, wherein the burner of the forced draft type combustion apparatus is a burner for a boiler of the hot water storage type.
8. A method of combustion control substantially as hereinbefore described with reference to the accompanying drawings.
9. Apparatus for combustion control substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5540480A JPS56151813A (en) | 1980-04-28 | 1980-04-28 | Proportional burning method and apparatus therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2075718A true GB2075718A (en) | 1981-11-18 |
| GB2075718B GB2075718B (en) | 1984-09-26 |
Family
ID=12997593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8111937A Expired GB2075718B (en) | 1980-04-28 | 1981-04-15 | Method and apparatus for combustion control |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS56151813A (en) |
| DE (1) | DE3116670A1 (en) |
| FR (1) | FR2481416B1 (en) |
| GB (1) | GB2075718B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062856A1 (en) * | 1981-04-13 | 1982-10-20 | Honeywell B.V. | Control device for a gas-heated boiler of a warm-water heating installation |
| EP0103303A2 (en) * | 1982-09-15 | 1984-03-21 | Joh. Vaillant GmbH u. Co. | Fuel-heated heat source |
| US4493635A (en) * | 1982-02-27 | 1985-01-15 | Osaka Gas Company Limited | Oxygen-enriched air ratio control device for combustion apparatus |
| US4588372A (en) * | 1982-09-23 | 1986-05-13 | Honeywell Inc. | Flame ionization control of a partially premixed gas burner with regulated secondary air |
| FR2594524A1 (en) * | 1986-02-18 | 1987-08-21 | Rinnai Kk | DEVICE FOR CONTROLLING COMBUSTION |
| GB2191022A (en) * | 1986-05-27 | 1987-12-02 | Rinnai Kk | A fluid heating apparatus |
| US4737101A (en) * | 1984-03-08 | 1988-04-12 | Davair Heating Limited | Oil burner |
| EP0317178A1 (en) * | 1987-11-19 | 1989-05-24 | Davair Heating Limited | Gas burner |
| US4913128A (en) * | 1986-04-23 | 1990-04-03 | Rinnai Corporation | Burner apparatus |
| US5630408A (en) * | 1993-05-28 | 1997-05-20 | Ranco Incorporated Of Delaware | Gas/air ratio control apparatus for a temperature control loop for gas appliances |
| EP1002998A2 (en) * | 1998-11-20 | 2000-05-24 | Robert Bosch Gmbh | Heater |
| WO2022183429A1 (en) * | 2021-03-04 | 2022-09-09 | Pittway Sarl | Partially-premixed gas burner appliance |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3232421C2 (en) * | 1982-09-01 | 1986-04-24 | Webasto-Werk W. Baier GmbH & Co, 8035 Gauting | Circuit arrangement for a heat demand-dependent control of the heating output of heating devices |
| DE3703934A1 (en) * | 1986-02-11 | 1987-08-13 | Vaillant Joh Gmbh & Co | Device for controlling the fuel and/or air supply to the burner of a heat source |
| CH676497A5 (en) * | 1987-10-19 | 1991-01-31 | Landis & Gyr Betriebs Ag | Forced-draught gas-burner control - uses conduit pressure to regulate gas quantity |
| AT401196B (en) * | 1992-02-07 | 1996-07-25 | Vaillant Gmbh | HEATER |
| US9593857B2 (en) * | 2014-03-07 | 2017-03-14 | ProGreen Labs, LLC. | Heating system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1551993A1 (en) * | 1967-11-06 | 1970-04-02 | Zenkner Dr Ing Kurt | Process for the continuous regulation of the output of oil or gas burners and device for the implementation of this process |
| JPS4948893B1 (en) * | 1970-08-29 | 1974-12-24 | ||
| JPS529243B2 (en) * | 1972-11-20 | 1977-03-15 | ||
| FR2287655A1 (en) * | 1974-10-08 | 1976-05-07 | Saunier Duval | FORCE DRAFT GAS BOILER REGULATION DEVICE |
| FR2296146A1 (en) * | 1974-12-24 | 1976-07-23 | Saunier Duval | FORCE DRAFT GAS BOILER REGULATION DEVICE |
| FR2305054A1 (en) * | 1975-03-18 | 1976-10-15 | Saunier Duval | EXHAUST FAN MOTOR CONTROL SLAVE DEVICE FOR FORCED DRAFT GAS BOILERS |
| JPS5943685B2 (en) * | 1976-12-15 | 1984-10-24 | 松下電器産業株式会社 | gas water heater |
| FR2479417A1 (en) * | 1980-03-26 | 1981-10-02 | Cem Comp Electro Mec | Monitor for liq. fuelled burner responding to air flow - uses propeller in combustion air stream to drive generator whose output is compared to activate solenoid valves in fuel lines |
-
1980
- 1980-04-28 JP JP5540480A patent/JPS56151813A/en active Pending
-
1981
- 1981-04-15 GB GB8111937A patent/GB2075718B/en not_active Expired
- 1981-04-27 FR FR8108369A patent/FR2481416B1/en not_active Expired
- 1981-04-27 DE DE19813116670 patent/DE3116670A1/en not_active Ceased
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062856A1 (en) * | 1981-04-13 | 1982-10-20 | Honeywell B.V. | Control device for a gas-heated boiler of a warm-water heating installation |
| US4493635A (en) * | 1982-02-27 | 1985-01-15 | Osaka Gas Company Limited | Oxygen-enriched air ratio control device for combustion apparatus |
| EP0103303A2 (en) * | 1982-09-15 | 1984-03-21 | Joh. Vaillant GmbH u. Co. | Fuel-heated heat source |
| EP0103303A3 (en) * | 1982-09-15 | 1984-06-06 | Joh. Vaillant GmbH u. Co. | Fuel-heated heat source |
| US4588372A (en) * | 1982-09-23 | 1986-05-13 | Honeywell Inc. | Flame ionization control of a partially premixed gas burner with regulated secondary air |
| US4737101A (en) * | 1984-03-08 | 1988-04-12 | Davair Heating Limited | Oil burner |
| FR2594524A1 (en) * | 1986-02-18 | 1987-08-21 | Rinnai Kk | DEVICE FOR CONTROLLING COMBUSTION |
| GB2187000A (en) * | 1986-02-18 | 1987-08-26 | Rinnai Kk | Burner control |
| DE3705005A1 (en) * | 1986-02-18 | 1987-08-27 | Rinnai Kk | COMBUSTION CONTROL DEVICE FOR A GAS BURNER |
| US4913128A (en) * | 1986-04-23 | 1990-04-03 | Rinnai Corporation | Burner apparatus |
| GB2191022A (en) * | 1986-05-27 | 1987-12-02 | Rinnai Kk | A fluid heating apparatus |
| GB2191022B (en) * | 1986-05-27 | 1990-09-26 | Rinnai Kk | A fluid heating apparatus |
| EP0317178A1 (en) * | 1987-11-19 | 1989-05-24 | Davair Heating Limited | Gas burner |
| US5630408A (en) * | 1993-05-28 | 1997-05-20 | Ranco Incorporated Of Delaware | Gas/air ratio control apparatus for a temperature control loop for gas appliances |
| EP1002998A2 (en) * | 1998-11-20 | 2000-05-24 | Robert Bosch Gmbh | Heater |
| EP1002998A3 (en) * | 1998-11-20 | 2003-01-02 | Robert Bosch Gmbh | Heater |
| WO2022183429A1 (en) * | 2021-03-04 | 2022-09-09 | Pittway Sarl | Partially-premixed gas burner appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2481416B1 (en) | 1987-02-06 |
| JPS56151813A (en) | 1981-11-25 |
| FR2481416A1 (en) | 1981-10-30 |
| GB2075718B (en) | 1984-09-26 |
| DE3116670A1 (en) | 1982-02-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |