GB2278674A - Supplying fuel/air mixture - Google Patents

Supplying fuel/air mixture Download PDF

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Publication number
GB2278674A
GB2278674A GB9311550A GB9311550A GB2278674A GB 2278674 A GB2278674 A GB 2278674A GB 9311550 A GB9311550 A GB 9311550A GB 9311550 A GB9311550 A GB 9311550A GB 2278674 A GB2278674 A GB 2278674A
Authority
GB
United Kingdom
Prior art keywords
impeller
fuel
air
burner
speed
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.)
Withdrawn
Application number
GB9311550A
Other versions
GB9311550D0 (en
Inventor
David Beale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INTER ALBION Ltd
Original Assignee
INTER ALBION Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by INTER ALBION Ltd filed Critical INTER ALBION Ltd
Priority to GB9311550A priority Critical patent/GB2278674A/en
Publication of GB9311550D0 publication Critical patent/GB9311550D0/en
Publication of GB2278674A publication Critical patent/GB2278674A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/60Devices for simultaneous control of gas and combustion air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/02Regulating fuel supply conjointly with air supply
    • F23N1/027Regulating fuel supply conjointly with air supply using mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00Ventilators
    • F23N2233/06Ventilators at the air intake
    • F23N2233/08Ventilators at the air intake with variable speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00Valves, nozzles or pumps
    • F23N2235/12Fuel valves
    • F23N2235/16Fuel valves variable flow or proportional valves

Abstract

An apparatus for supplying a pre-mixed fuel/air mixture to a burner, e.g. of a water-heating boiler, comprises a rotary variable-speed air impeller (2) driven at a speed which varies with the demand for heat from the burner, a variable-aperture fuel valve (7) for delivering fuel into the air entrained by the impeller, and a centrifugal control device (3, 4, 5) mounted on the impeller, comprising centrifugal weights (4) acting through levers (3, 5) and thrust means (6, 61) on the fuel valve (7) against a spring (62), to vary the fuel valve opening in dependence on the impeller speed and hence on the rate of air flow. <IMAGE>

Description

APPARATUS FOR SUPPLYING A FUEL/AIR MIXTURE This invention relates to apparatus for supplying a fuel/air mixture to a burner, e.g. of a water-heating boiler for a domestic hot water or central heating system.
It has recently been recognised to be advantageous to use burners which are fed with a premixed fuel/air (e.a.
gas/air) mixture and produce very short flames, and to cope with varying demands for heat by varying the supply of fuel rather than by switching the burner on and off as was previously the practice. The correct proportions of fuel and air in the mixture supplied to the burner must be maintained despite variation in the rate of supply. This requires that variations in the rate of flow of each constituent must be simultaneous. Furthermore the means for maintaining the correct proportions must be reliable and conform to statutory safety requirements.
Mechanical gas/air mixers have been devised for this purpose, in which air is supplied at a constant pressure and the proportions of gas and air are determined by respective restricting elements, surplus air being dumped out of the system with consequent problems over disposal of the dumped air. Alternatively electronic flow detecting and measuring devices may be used, but this involves use of relatively expensive electronic means for ensuring maintanance of the correct proportions of fuel and air.
The object of the invention is to provide relatively simple, inexpensive but reliable means for ensuring supply of the correct proportions of fuel and air at varying rates of delivery.
According to the invention, there is provided an apparatus for supplying a fuel/air mixture to a burner, e.g.
of a water-heating boiler, comprising a rotary variable-speed air impeller arranged to be driven at a speed which varies with the demand for heat from the burner, and a variableaperture fuel valve for delivering fuel into the air entrained by the impeller, wherein a fuel delivery control device is mounted for rotation with the rotary impeller and is arranged to cause the fuel valve aperture to be varied progressively in dependence on the rotational speed of the impeller. Variation of the fuel supply is thus effected simultaneously with variations in the air flow. Since the rate of air flow is proportional to the impeller speed, the correct proportions of fuel and air can be maintained in a simple and reliable manner.
Preferably the fuel delivery control device is actuated by centrifugal force. For example, it may comprise weights pivotally mounted on the rotary impeller so that centrifugal force causes the weights to fly outwards on rotation of the impeller. The weights may each be secured to one end of a respective bell-crank lever pivoted on the rotary impeller, the other end of each bell-crank lever acting on an operating member of the fuel valve against a spring. Other forms of centrifugally actuated device may alternatively be used, such as a conventional engine governor employing centrifugal weights connected to two rotary members so as to draw them together as the weights fly outwards.
An embodiment of the invention will now be described in more detail by way of example and with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic axial section through an apparatus for supplying a gas/air mixture, and Figure 2 is a detail view of a centrifugal control element of the apparatus.
As shown in Figure 1, the apparatus comprises a fixed fan casing 1 having an outlet 11 for the gas/air mixture and containing a rotary impeller 2 arranged to be driven by a motor 21 at a speed dependent on the demand for heat from a burner (not shown) to which the gas/air mixture is delivered from the outlet 11. Air is supplied to the fan casing 1 through an inlet passage 12.
Bell-crank levers 3 carrying weights 4 at their outer ends are pivotally mounted on the rotary impeller 2 so that on rotation of the impeller, centrifugal force will cause the weights to move outwards as shown in chain lines in Figure 2. The inner, shorter, arms 5 of the bell-crank levers 3 are in contact with a thrust plate 6 connected by a thrust rod 61 to a variable-aperture fuel valve 7. A compression spring 62 acts on the thrust plate 6 to urge it to the right in Figure 1, i.e. in the direction to close the valve 7. Fuel gas is supplied to the valve 7 through a pipe 8.
On rotation of the impeller 2, the weights 4 move outwards and the arms 5 consequently move to the left, forcing the thrust plate 6 to the left as shown in Figures 1 and 2, against the action of the spring 62. The thrust rod 61 thus opens the fuel valve 7 progressively in dependence on the rotational speed of the impeller 2. The rotational speed of the motor 21, which drives the impeller 2, is controlled by known means (not shown) in dependence on the demand for heat from the burner. The gas and air supplies are thus varied simultaneously and the correct proportions of gas and air can be simply and reliably maintained.

Claims (5)

CLAIMS:
1. An apparatus for supplying a fuel/air mixture to a burner, e.a. of a water-heating boiler, comprising a rotary variable-speed air impeller arranged to be driven at a speed which varies with the demand for heat from the burner, and a variable-aperture fuel valve for delivering fuel into the air entrained by the impeller, wherein a fuel delivery control device is mounted for rotation with the rotary impeller and is arranged to cause the fuel valve aperture to be varied progressively in dependence on the rotational speed of the impeller.
2. An apparatus according to Claim 1, wherein the fuel delivery control device is actuated by centrifugal force.
3. An apparatus according to Claim 2, wherein the fuel delivery control device comprises weights pivotally mounted on the rotary impeller so that centrifugal force causes the weights to fly outwards on rotation of the impeller.
4. An apparatus according to Claim 3, wherein the weights are each secured to one end of a respective bell-crank lever pivoted on the rotary impeller, the other end of each bell-crank lever acting on an operating member of the fuel valve against a spring.
5. An apparatus for supplying a fuel/air mixture to a burner, e.g. of a water-heating boiler, substantially as hereinbefore described with reference to the accompanying drawing.
GB9311550A 1993-06-04 1993-06-04 Supplying fuel/air mixture Withdrawn GB2278674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9311550A GB2278674A (en) 1993-06-04 1993-06-04 Supplying fuel/air mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9311550A GB2278674A (en) 1993-06-04 1993-06-04 Supplying fuel/air mixture

Publications (2)

Publication Number Publication Date
GB9311550D0 GB9311550D0 (en) 1993-07-21
GB2278674A true GB2278674A (en) 1994-12-07

Family

ID=10736633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9311550A Withdrawn GB2278674A (en) 1993-06-04 1993-06-04 Supplying fuel/air mixture

Country Status (1)

Country Link
GB (1) GB2278674A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019094A1 (en) * 2008-08-14 2010-02-18 Haldex Traction Ab Hydraulic actuator
US7887763B2 (en) 2003-12-24 2011-02-15 Roger Kennedy Apparatus for chemical or biological reactions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006926A (en) * 1977-10-03 1979-05-10 Aksola T Air flow regulator
GB2048454A (en) * 1979-05-02 1980-12-10 Orion Machinery Co Ltd Combustion control device for nozzle spray type burner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006926A (en) * 1977-10-03 1979-05-10 Aksola T Air flow regulator
GB2048454A (en) * 1979-05-02 1980-12-10 Orion Machinery Co Ltd Combustion control device for nozzle spray type burner

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7887763B2 (en) 2003-12-24 2011-02-15 Roger Kennedy Apparatus for chemical or biological reactions
WO2010019094A1 (en) * 2008-08-14 2010-02-18 Haldex Traction Ab Hydraulic actuator
CN102105716A (en) * 2008-08-14 2011-06-22 哈尔德克斯引力股份公司 Hydraulic actuator
US8123016B2 (en) 2008-08-14 2012-02-28 Borgwarner Torqtransfer Systems Ab Hydraulic actuator
CN102105716B (en) * 2008-08-14 2013-06-05 哈尔德克斯引力股份公司 Hydraulic actuator

Also Published As

Publication number Publication date
GB9311550D0 (en) 1993-07-21

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)