GB1599456A - Control apparatus for gaseous fuel burners - Google Patents

Control apparatus for gaseous fuel burners Download PDF

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Publication number
GB1599456A
GB1599456A GB22847/78A GB2284778A GB1599456A GB 1599456 A GB1599456 A GB 1599456A GB 22847/78 A GB22847/78 A GB 22847/78A GB 2284778 A GB2284778 A GB 2284778A GB 1599456 A GB1599456 A GB 1599456A
Authority
GB
United Kingdom
Prior art keywords
gas flow
gas
valve
inlet
flow 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.)
Expired
Application number
GB22847/78A
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.)
TI Domestic Appliances Ltd
Original Assignee
TI Domestic Appliances 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 TI Domestic Appliances Ltd filed Critical TI Domestic Appliances Ltd
Priority to GB22847/78A priority Critical patent/GB1599456A/en
Publication of GB1599456A publication Critical patent/GB1599456A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • 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
    • F23N2235/18—Groups of two or more 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO CONTROL APPARATUS FOR GASEOUS FUEL BURNERS (71) We, T. I. DOMESTIC APPLIANCES LIMITED, a British Company, of Radiation House, North Circular Road, London. NW10 0JP, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to control apparatus for gaseous fuel burners and has particular reference to apparatus for controlling the flow of gaseous fuel to gas burners of gas burning appliances for example gas-fired water heaters.
It is an object of the present invention to provide a form of such control apparatus having a simplified user control.
According to the present invention, control apparatus for a gaseous fuel burner assembly comprising a main burner and a pilot burner includes a housing having an inlet leading to a first chamber having an outlet through which gas is supplied to the main burner, and a second chamber isolatable for gas supply purposes from the first chamber and having an outlet through which gas is supplied to the pilot burner, a pilot safety device for preventing gas flow to both chambers, and a gas flow control member having a first gas flow control valve for controlling gas flow from the inlet to the first chamber and a second gas flow control valve for controlling gas flow from the inlet to the second chamber, the gas flow control member being movable between positions in which gas flow is permitted from the inlet to both first and second chambers, or from the inlet to the first chamber only, or from the inlet to the second chamber only.
The first and second chambers may be isolated from one another by a gas-tight partition. The gas flow control member may pass through the partition.
The first and second gas flow control valves may be mounted upon the gas flow control member which may be movable between its several positions by a manuallyoperable control member which may include a cam surface.
By way of example only, an embodiment of the invention will now be described in greater detail with reference to the accompanying drawing which is a cross-section showing the embodiment in schematic form only.
Referring to the drawing, the control apparatus comprises a housing 1 having a gas inlet 2, a first chamber la with an outlet toa main burner 4, and a second chamber ib with an outlet 5 to a pilot burner 6. Adjacent the pilot burner 6 is one component 7 of a pilot safety device which acts in conjunction with a valve 8, also forming part of the safety device, to control gas flow from the inlet 2 to the main and pilot gas burners 4 and 6 respectively.
Component 7 includes a thermocouple junction exposed to the pilot flame when the pilot burner is ignited. The e.m.f. generated by the thermocouple operates an electromagnet 9 which, when energised, holds valve B away from its seating and permits gas flow to the main and pilot burners. It will be appreciated that other forms of pilot safety device may be used instead of the thermocouple and electromagnet described.
Internally, the entrance to the chamber la is formed as a restriction 10 one side of which is formed as a seating for the valve 8 and the other side of which is formed as a seating for a valve 11 carried by an operating member 12 one end 13 of which projects from the housing 1 and is in contact with a cam surface 14 which may be part of a user operated control knob (not shown).
The operating member 12 is supported within the housing 1 by a partition 15 fixed with respect to the housing and separates the chambers la and ib and Is provided with sealing means to prevent leakage of gas from one side of the partition to the other.
Over the major part of its length, the operating member 12 is hollow, the hollow part being open-ended as at 16 and being provided with lateral gas inlet and gas outlet ports 17 and 18 thus providing gas flow to the pilot burner. As can be seen from the drawing, the hollow part of the member 12 terminates, when the member is in the posi tion shown in the drawing, adjacent a sealing member 19 which co-operates, as will be described below, with a valve member 20 mounted upon, and movable with, the operating member 12.
The apparatus is shown in the drawing with its components in the positions they occupy when gas is flowing to both main and pilot burners 4, 6, that is to say with the control in its "ON" position. If now the flame of the pilot burner extinguishes for some reason the pilot safety device operates and electromagnet 9 is de-energised and valve 8 closes on to its seating thereby cutting off gas flow to both main and pilot burners 4, 6 respectively via the respective chambers la, 1.
To restart, the control is now moved to the "Pilot Only" position in which the operating member 12 has been moved to the left by an extent sufficient to lift the valve 8 from its seating, to allow gas flow through the apertures 18 and to seat valve 11 on its seating. In that condition gas flows from inlet 2, through the apertures 17 of the operating member 12, along the hollow portion of member 12 and through the apertures 18 to the exit 5 to the pilot burner where it is ignited by the user. Gas flow to the main burner 4 is prevented by valve 11 which is seated upon restrictor 10.
After a short time interval, the thermocouple 7 generates an e.m.f. to energise the electromagnet 9 to a degree sufficient to hold the valve 8 in its open position shown in the drawing. At this stage, the user now operates the control to the "ON" position shown in the drawing. In that position, the operating member 12 is in the position shown and valve 11 is withdrawn from its seating allowing gas to flow to the main burner 4 via exit 3, gas issuing from burner 4 being ignited by the adjacent flame of the pilot burner 6.
If the user wishes to turn off the appliance to which the control apparatus is fitted, the control is operated to the "OFF" position, this action allowing the operating member 12 to move to the right to an extent sufficient to allow valve 20 to seat on sealing member 19 thus preventing gas flow to the pilot burner. At this stage, the thermocouple is still hot so that electromagnet 9 remains energised and gas continues to flow to the main burner 4 where it burns off.
However, after a short time interval the electromagnet is de-energised and valve 8 moves on to its seating thereby shutting-off the flow of gas to the main burner.
The drawing shows the apparatus in diag- rammatic form only. In practice, the housing 1 is open-ended to permit entry of the electromagnet 9 and valve 8 and of the operating member 12 and the components carried by that member. The ends of the housing are closed by suitable plugs fitted with leak-preventing seals. In addition, the interior of the housing may be formed with a seating against which partition 15, separable from the housing, is urged in gas-tight manner by a spring disposed between the partition and the valve 20. Movement of the operating member 12 to the left as described above takes place against the action of that spring which serves to maintain the end of the member 12 in contact with cam surface 14. A second, weaker spring may be located between the partition 15 and the valve 11.
WHAT WE CLAIM IS: 1. Control apparatus for a gaseous fuel burner assembly comprising a main burner and a pilot burner, the apparatus including a housing having an inlet leading to a first chamber having an outlet through which gas is supplied to the main burner, a second chamber isolatable for gas supply purposes from the first chamber and having an outlet through which gas is supplied to the pilot burner, a pilot safety device for preventing gas flow to the inlet, and a gas flow control member having a first gas flow control valve for controlling gas flow from the inlet to the first chamber and a second gas flow control valve for controlling gas flow from the inlet to the second chamber, the gas flow control member being movable between positions in which gas flow is permitted from the inlet to both first and second chambers, or from the inlet to the first chamber only, or from the inlet to the second chamber only.
2. Control apparatus as claimed in claim 1 in which the first and second chambers are parts of a common chamber isolated from one another by a gas-tight partition.
3. Control apparatus as claimed in claim 2 in which the gas flow control member passes in gas-tight manner through the partition.
4. Control apparatus as claimed in any one of the preceding claims in which the first and second gas flow control valves are mounted upon and are movable with the gas flow control member.
5. Control apparatus as claimed in any one of the preceding claims and further comprising a manually-operable control member operatively connected to the gas flow control member for moving the latter between its several positiOns.
6. Control apparatus as claimed in any one of the preceding claims in which the inlet is formed to provide a seating for the first gas flow control valve and for a gas flow control valve operable by the pilot safety device.
7. Control apparatus as claimed in claim 6 and in which the gas flow control member has a gas flow passageway communicating at one end with a gas inlet port and at the other
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (14)

**WARNING** start of CLMS field may overlap end of DESC **. tion shown in the drawing, adjacent a sealing member 19 which co-operates, as will be described below, with a valve member 20 mounted upon, and movable with, the operating member 12. The apparatus is shown in the drawing with its components in the positions they occupy when gas is flowing to both main and pilot burners 4, 6, that is to say with the control in its "ON" position. If now the flame of the pilot burner extinguishes for some reason the pilot safety device operates and electromagnet 9 is de-energised and valve 8 closes on to its seating thereby cutting off gas flow to both main and pilot burners 4, 6 respectively via the respective chambers la, 1. To restart, the control is now moved to the "Pilot Only" position in which the operating member 12 has been moved to the left by an extent sufficient to lift the valve 8 from its seating, to allow gas flow through the apertures 18 and to seat valve 11 on its seating. In that condition gas flows from inlet 2, through the apertures 17 of the operating member 12, along the hollow portion of member 12 and through the apertures 18 to the exit 5 to the pilot burner where it is ignited by the user. Gas flow to the main burner 4 is prevented by valve 11 which is seated upon restrictor 10. After a short time interval, the thermocouple 7 generates an e.m.f. to energise the electromagnet 9 to a degree sufficient to hold the valve 8 in its open position shown in the drawing. At this stage, the user now operates the control to the "ON" position shown in the drawing. In that position, the operating member 12 is in the position shown and valve 11 is withdrawn from its seating allowing gas to flow to the main burner 4 via exit 3, gas issuing from burner 4 being ignited by the adjacent flame of the pilot burner 6. If the user wishes to turn off the appliance to which the control apparatus is fitted, the control is operated to the "OFF" position, this action allowing the operating member 12 to move to the right to an extent sufficient to allow valve 20 to seat on sealing member 19 thus preventing gas flow to the pilot burner. At this stage, the thermocouple is still hot so that electromagnet 9 remains energised and gas continues to flow to the main burner 4 where it burns off. However, after a short time interval the electromagnet is de-energised and valve 8 moves on to its seating thereby shutting-off the flow of gas to the main burner. The drawing shows the apparatus in diag- rammatic form only. In practice, the housing 1 is open-ended to permit entry of the electromagnet 9 and valve 8 and of the operating member 12 and the components carried by that member. The ends of the housing are closed by suitable plugs fitted with leak-preventing seals. In addition, the interior of the housing may be formed with a seating against which partition 15, separable from the housing, is urged in gas-tight manner by a spring disposed between the partition and the valve 20. Movement of the operating member 12 to the left as described above takes place against the action of that spring which serves to maintain the end of the member 12 in contact with cam surface 14. A second, weaker spring may be located between the partition 15 and the valve 11. WHAT WE CLAIM IS:
1. Control apparatus for a gaseous fuel burner assembly comprising a main burner and a pilot burner, the apparatus including a housing having an inlet leading to a first chamber having an outlet through which gas is supplied to the main burner, a second chamber isolatable for gas supply purposes from the first chamber and having an outlet through which gas is supplied to the pilot burner, a pilot safety device for preventing gas flow to the inlet, and a gas flow control member having a first gas flow control valve for controlling gas flow from the inlet to the first chamber and a second gas flow control valve for controlling gas flow from the inlet to the second chamber, the gas flow control member being movable between positions in which gas flow is permitted from the inlet to both first and second chambers, or from the inlet to the first chamber only, or from the inlet to the second chamber only.
2. Control apparatus as claimed in claim 1 in which the first and second chambers are parts of a common chamber isolated from one another by a gas-tight partition.
3. Control apparatus as claimed in claim 2 in which the gas flow control member passes in gas-tight manner through the partition.
4. Control apparatus as claimed in any one of the preceding claims in which the first and second gas flow control valves are mounted upon and are movable with the gas flow control member.
5. Control apparatus as claimed in any one of the preceding claims and further comprising a manually-operable control member operatively connected to the gas flow control member for moving the latter between its several positiOns.
6. Control apparatus as claimed in any one of the preceding claims in which the inlet is formed to provide a seating for the first gas flow control valve and for a gas flow control valve operable by the pilot safety device.
7. Control apparatus as claimed in claim 6 and in which the gas flow control member has a gas flow passageway communicating at one end with a gas inlet port and at the other
end with a gas outlet port, gas flow through the outlet port being controlled by the second gas flow control valve.
8. Control apparatus as claimed in claim 7 in which the gas flow control member is hollow over the major part of its length, the hollow part being open at one end to form the gas inlet port, the first gas flow control valve being mounted upon the gas flow control member at a position such that, when the first gas flow control valve is seated upon the inlet seating, the open end is in communication with the inlet, and gas flow through the outlet port is permitted by the second gas flow control valve.
9. Control apparatus S claimed in any one of claims 6, 7 or 8 when appended to claim 2 and in which the partition is separable from the housing and is retained in position by resilient means.
10. Control apparatus as claimed in claim 9 in which the resilient means operates between the partition and the second gas flow control valve.
11. Control apparatus as claimed in any one of the preceding claims in which the pilot safety device comprises an electromagnetically operated gas flow control valve.
12. A gas burner assembly including control apparatus as claimed in any one of the preceding claims and a main gas burner connected to the first mentioned outlet, and a pilot burner connected to the second mentioned outlet.
13. A gas fired appliance including a gas burner assembly as claimed in claim 12.
14. Control apparatus substantially as herein described with reference to and as illustrated by the accompanying drawing.
GB22847/78A 1978-05-25 1978-05-25 Control apparatus for gaseous fuel burners Expired GB1599456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB22847/78A GB1599456A (en) 1978-05-25 1978-05-25 Control apparatus for gaseous fuel burners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22847/78A GB1599456A (en) 1978-05-25 1978-05-25 Control apparatus for gaseous fuel burners

Publications (1)

Publication Number Publication Date
GB1599456A true GB1599456A (en) 1981-10-07

Family

ID=10186002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22847/78A Expired GB1599456A (en) 1978-05-25 1978-05-25 Control apparatus for gaseous fuel burners

Country Status (1)

Country Link
GB (1) GB1599456A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001090649A1 (en) * 2000-05-26 2001-11-29 Teddington Controls Limited Gas control valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001090649A1 (en) * 2000-05-26 2001-11-29 Teddington Controls Limited Gas control valve
GB2369427A (en) * 2000-05-26 2002-05-29 Teddington Controls Ltd Gas control valve
GB2369427B (en) * 2000-05-26 2004-11-03 Teddington Controls Ltd Gas control valve

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee