GB1569762A - Domestic ovens - Google Patents

Domestic ovens Download PDF

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Publication number
GB1569762A
GB1569762A GB862276A GB862276A GB1569762A GB 1569762 A GB1569762 A GB 1569762A GB 862276 A GB862276 A GB 862276A GB 862276 A GB862276 A GB 862276A GB 1569762 A GB1569762 A GB 1569762A
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GB
United Kingdom
Prior art keywords
burner
oven
restriction
gas
valve
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
GB862276A
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.)
Glywed Domestic & Heating Appl
Original Assignee
Glywed Domestic & Heating Appl
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 Glywed Domestic & Heating Appl filed Critical Glywed Domestic & Heating Appl
Priority to GB862276A priority Critical patent/GB1569762A/en
Priority to DE19772708645 priority patent/DE2708645A1/en
Priority to FR7706411A priority patent/FR2343203A1/en
Publication of GB1569762A publication Critical patent/GB1569762A/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/12—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
    • G05D23/125—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow
    • G05D23/126—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube
    • G05D23/127—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation
    • G05D23/128—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation the fluid being combustible
    • 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
    • F23N5/027—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

(54) IMPROVEMENTS IN DOMESTIC OVENS (71) We, BRIAN HARDING, a British subject of 28 Arlington Road, West Bromwich, West Midlands B7 11 AD, and GLYNWED DOMESTIC AND HEATING APPLIANCES LIMITED' a British Company of Headland House, Sheldon, Birmingham, 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 improvements in gas-fired domestic ovens.
Generally, the gas burners of known ovens are thermostatically controlled and are arranged to maintain the oven at a considerably elevated temperature, usually above boiling point, in order to cook food as rapidly as possible which has the advantage that time is saved in the preparation of meals. Such rapid cooking has the disadvantage of placing a limitation on the type of dishes which can be cooked satisfactorily. For example, only more expensive cuts of meat can be cooked satisfactorily as opposed to cheaper cuts which are not suitable to be cooked satisfactorily at such elevated temperatures. Also, a considerable amount of energy is utilised in raising the oven to the elevated temperature and of maintaining it at such a temperature.
The present invention consists in a gas-fired domestic oven in which a thermostatically controlled valve controls gas flow to a gas burner in the oven for normal cooking, and a selectively operative restriction separate from the thermostatic control of the valve is constructed and arranged to restrict the gas flow to or at the, or a, gas burner in the oven to a pre-determined valve for sustaining a slow cooking flame at the burner capable of heating and maintaining the centre of the oven at a temperature between 650C and 95"C, at an ambient temperature of 200C.
This enables the oven to operate at temperatures lower than that at which it could otherwise normally operate in a conventional manner with a thermostatically controlled burner. This has the advantage that the oven can be used to carry out a "slow cooking method" in which food is cooked slowly for long periods of time.
As the oven can be used to carry out the slow cooking method, there are the advantages that cheaper cuts of meat can be cooked satisfactorily, there is no critical time at which a dish is or is not "cooked", vitamins are maintained and are not destroyed by temperatures above boiling point, and energy is conserved since only a relatively small quantity is required to maintain the centre of the oven at a temperature in the said temperature range.
The restriction may be located in a supply leading into or out of the thermostatically controlled valve of the oven with the burner to which the gas flow is restricted by the restriction comprising the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve. Alternatively the restriction may be located in a flow path which by-passes the thermostatically controlled valve with the flow path supplying gas to the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve and/or a separate auxiliary burner.
In a modification the restriction is located in a supply line to a burner which is separate from the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve of the oven, and said separate burner may comprise a pilot burner, and flow through the restriction is controlled by an on/off tap separate from the thermostatically controlled valve.
Some embodiments of our invention are illustrated in the accompanying drawings in.
which Figure lis a layout of a gas supply system for a main burner of a domestic oven; Figure 2 is a layout of a system similar to Figure 1; Figure 3 is a layout of another system; Figure 4 is a layout of a system incorporating a pilot burner; Figure 5 is a layout of a system similar to Figure 4; and Figure 6 is a longitudinal section through a thermostatically-controlled valve.
In the gas supply system illustrated in Figure 1 for a domestic oven, a main burner 1 is supplied with gas from an injector 2, and the gas is supplied to the injector 2 through an outlet pipe-line 3 from a thermostatically-controlled valve 4 which, in turn, receives gas from a supply 5 through an inlet pipe-line 6. Normally, therefore gas is supplied to the burner through the valve 4 which regulates the gas supplied to the burner 1 in accordance with the temperature at which the oven is to be maintained by the thermostat. The burner 1 may be provided with an electrically controlled spark and reignition mechanism of known type (not shown) to ensure that the burner remains ignited at all times, although the flame may be extinguished intermittently by accident, for example by a draught produced when the door of the oven is opened or closed.
In accordance with our invention a restriction 7 is provided in the pipe-line 6.
The restriction is effective when the oven is to be used for carrying out a "slow cooking method" by restricting the quantity of gas which can be supplied ta the burner 1 to a value for sustaining a slow cooking flame capable of heating and maintaining the centre oven temperature between 65"C and 95"C. The restriction 7 is of the solenoid-operated type and is normally fully open to permit a maximum gas flow to the valve 4. However, for "slow-cooking" the solenoid is operative to reduce the area of the restriction to a value consistent with the volume of gas required to sustain the "slow cooking" flame.
In the system illustrated in Figure 2 the restriction 7 is located in the pipe-line 3 between the valve 4 and the injector 2.
In the system illustrated in Figure 3 the restriction 7 is of the fixed type and is located in a by-pass line 8 which by-passes the valve 4 and, for slow cooking purposes, is supplied with gas from the supply 3 through a slow cooking valve 8a in the by-pass line 8.
In the system illustrated in Figure 4 the bypass line 8 is omitted and a pilot burner 9 is located adjacent to the main burner 1. The pilot burner 9 is supplied with gas from the supply 5 through a branch line 10 in which is located a control device 11 for the pilot burner 9 and the restriction 7 which is of the fixed type is also located in the branch line 10 on the downstream side of the control device 11.
In this embodiment the "slow cooking" method is carried out by the pilot burner 9 under the control of the restriction 7.
In a modification the restriction 7 is omitted and the nozzle of the burner 9 itself is of resstricted size capable of sub staining a flame for heating and maintaining the oven at the desired temperature.
When not in use for "slow cooking" the pilot burner 9 provides a pilot flame for the main burner 1, and the system incorporates a flame failure valve 12 which is located in the pipe-line 3 and which is adapted to cut-off the supply of gas to the main burner should the flame at the burner 9 be extinguished.
In the system illustrated in Figure 5 for "slow cooking" gas is supplied to the pilot burner through the restriction 7 which is of the fixed type and which is located in a line 14 leading from the valve 4 to a point the branch line 10 on the downstream side of the control device 11.
Figure 6 is a longitudinal section through a control valve to replace the control valve 4 and the restrictor 7 in the systems described above.
The control valve is in accordance with the thermostatically-controlled valve assembly described and claimed in the complete Specification of our copending Patent Application serial No. 1 569 761 No.8621/76, and comprises a housing 15 incorporating a bore 16 in which is mounted a rotatable valve member 17 for regu- lating the supply of gas from the supply 5 and into a chamber 18 in the housing A thermostat 19 is located in the housing for controlling operation of a valve 20 for regulating the quantity of gas supplied to the main burner 1 in accordance with the temperature to be maintained in the oven. The valve member 17 is rotatable through the normal range of oven settings in accordance with the temperature to be maintained.
According to our invention the valve member 17 is provided with a by-pass passage 21 which connects the inlet pipe-line 6 to the outlet pipe-line 3 directly at an "S" setting for slow cooking at which the valve member 17 is disposed between the "OFF" and the "14" position. The "S" position is selected by the use of the conventional graduated control knob which is coupled to the valve member 17 by means of a spindle 23. At the "S" setting the by-pass passage 21 comprises the restriction which is arranged only to pass sufficient gas to the burner 1 to carry out the "slow cooking" method.
In all the constructions described above the thermostat is inoperative when the oven is used for slow cooking on the "S" setting.
The restrictions 7 and 21 may also be of the variable type which are thermostatically con trolled in a feed-back loop. This type has the advantage that the slow cooking temperature can be varied and can be maintained accurately within desired limits.
WHAT WE CLAIM IS: 1. A gas-fired domestic oven in which a thermostatically controlled valve controls gas flow to a gas burner in the oven for normal cooking, and a selectively operative restriction separate from the thermostatic control of the valve is constructed and arranged to restrict the gas flow to or at the, or a, gas burner in the oven to a pre-determined value for sustaining a slow cooking flame at the burner capable of heating and maintaining the centre of the oven at a temperature between 65 C and 95"C, at an ambient temperature of 20"C.
2. An oven as claimed in Claim 1 in which the restriction is of the fixed type.
3. An oven as claimed in Claim 1 in which the restriction is of the fixed type.
3. An oven as claimed in Claim 1 in which the restriction is of the variable type thermostatically controlled in a feed back loop from the burner.
4. An oven as claimed in Claim 1 in which the restriction is of the variable type thermostatically controlled in a feed back loop from the burner to which the gas flow is restricted by the restriction.
5. An oven as claimed in any preceding claim in which the burner to which the restriction restricts the gas flow is controlled by the thermostatically controlled valve, and the restriction is located in a gas supply line upstream of the thermostatically controlled valve.
6. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, and the restriction is located in a line between the burner and the thermostatically controlled valve.
7. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, a by-pass line by-passes the thermostatically controlled valve and the restriction is located in the by-pass line.
8. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, and a control valve is provided which comprises a valve member rotatable in a bore in a housing to regulate the supply of gas from an inlet to the burner through a valve controlled by a thermostat, and the valve member is provided with a by-pass passage which defines the restriction and which by-passes the valve controlled by the thermostat at a slow cooking setting of the valve member in which the supply from the inlet to the valve controlled by the thermostat is otherwise cut off.
9. An oven as claimed in Claims 1 to 4 in which the burner to which the restriction restricts the gas flow comprises a pilot burner located adjacent to the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, the sup ply to the last-mentioned burner being cut off when the restriction is selected to be operative.
10. An oven as claimed in Claim 9 in which the pilot burner is supplied with gas through a control device from a supply for the other burner.
11. An oven as claimed in Claim 9 or Claim 10 in which the pilot burner has a nozzle which is of restricted size to define the restriction.
12. An oven as claimed in Claim 10 in which the restriction is located in a line between the control device and the pilot burner.
13. An oven as claimed in Claim 9 or Claim 10 in which a branch line leads from the thermostatically controlled valve to the pilot burner, and the restriction is located in the branch line.
14. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 1 of the accompanying drawings.
15. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 2 of the accompanying drawings.
16. A gas-frred domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 3 of the accompanying drawings.
17. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 4 of the accompanying drawings.
18. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure S of the accompanying drawings.
19. A gased domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 6 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (19)

**WARNING** start of CLMS field may overlap end of DESC **. trolled in a feed-back loop. This type has the advantage that the slow cooking temperature can be varied and can be maintained accurately within desired limits. WHAT WE CLAIM IS:
1. A gas-fired domestic oven in which a thermostatically controlled valve controls gas flow to a gas burner in the oven for normal cooking, and a selectively operative restriction separate from the thermostatic control of the valve is constructed and arranged to restrict the gas flow to or at the, or a, gas burner in the oven to a pre-determined value for sustaining a slow cooking flame at the burner capable of heating and maintaining the centre of the oven at a temperature between 65 C and 95"C, at an ambient temperature of 20"C.
2. An oven as claimed in Claim 1 in which the restriction is of the fixed type.
3. An oven as claimed in Claim 1 in which the restriction is of the fixed type.
3. An oven as claimed in Claim 1 in which the restriction is of the variable type thermostatically controlled in a feed back loop from the burner.
4. An oven as claimed in Claim 1 in which the restriction is of the variable type thermostatically controlled in a feed back loop from the burner to which the gas flow is restricted by the restriction.
5. An oven as claimed in any preceding claim in which the burner to which the restriction restricts the gas flow is controlled by the thermostatically controlled valve, and the restriction is located in a gas supply line upstream of the thermostatically controlled valve.
6. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, and the restriction is located in a line between the burner and the thermostatically controlled valve.
7. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, a by-pass line by-passes the thermostatically controlled valve and the restriction is located in the by-pass line.
8. An oven as claimed in any of Claims 1 to 4 in which the burner to which the restriction restricts the gas flow is the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, and a control valve is provided which comprises a valve member rotatable in a bore in a housing to regulate the supply of gas from an inlet to the burner through a valve controlled by a thermostat, and the valve member is provided with a by-pass passage which defines the restriction and which by-passes the valve controlled by the thermostat at a slow cooking setting of the valve member in which the supply from the inlet to the valve controlled by the thermostat is otherwise cut off.
9. An oven as claimed in Claims 1 to 4 in which the burner to which the restriction restricts the gas flow comprises a pilot burner located adjacent to the burner to which for normal cooking the gas flow is controlled by the thermostatically controlled valve, the sup ply to the last-mentioned burner being cut off when the restriction is selected to be operative.
10. An oven as claimed in Claim 9 in which the pilot burner is supplied with gas through a control device from a supply for the other burner.
11. An oven as claimed in Claim 9 or Claim 10 in which the pilot burner has a nozzle which is of restricted size to define the restriction.
12. An oven as claimed in Claim 10 in which the restriction is located in a line between the control device and the pilot burner.
13. An oven as claimed in Claim 9 or Claim 10 in which a branch line leads from the thermostatically controlled valve to the pilot burner, and the restriction is located in the branch line.
14. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 1 of the accompanying drawings.
15. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 2 of the accompanying drawings.
16. A gas-frred domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 3 of the accompanying drawings.
17. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 4 of the accompanying drawings.
18. A gas-fired domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure S of the accompanying drawings.
19. A gased domestic oven incorporating a gas supply system substantially as described with reference to and as illustrated in Figure 6 of the accompanying drawings.
GB862276A 1976-03-04 1976-03-04 Domestic ovens Expired GB1569762A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB862276A GB1569762A (en) 1976-03-04 1976-03-04 Domestic ovens
DE19772708645 DE2708645A1 (en) 1976-03-04 1977-02-28 GAS HEATED HOUSEHOLD STOVE
FR7706411A FR2343203A1 (en) 1976-03-04 1977-03-04 DOMESTIC OVENS IMPROVEMENTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB862276A GB1569762A (en) 1976-03-04 1976-03-04 Domestic ovens

Publications (1)

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GB1569762A true GB1569762A (en) 1980-06-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB862276A Expired GB1569762A (en) 1976-03-04 1976-03-04 Domestic ovens

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DE (1) DE2708645A1 (en)
FR (1) FR2343203A1 (en)
GB (1) GB1569762A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7690916B2 (en) 2002-04-16 2010-04-06 Miele & Cie. Kg Method and apparatus for operating a gas-powered cooking and frying device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19641920A1 (en) * 1996-10-11 1998-04-16 Gaggenau Werke Method and device for controlling the flame size of gas-operated cooking or baking devices
DE10101733A1 (en) * 2001-01-16 2002-07-18 Bsh Bosch Siemens Hausgeraete Method for controlling burners at gas cooking points and in gas baking ovens separates a flow of gas into parallel sectional gas flows to allow adjustment in burner power levels.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7690916B2 (en) 2002-04-16 2010-04-06 Miele & Cie. Kg Method and apparatus for operating a gas-powered cooking and frying device

Also Published As

Publication number Publication date
FR2343203A1 (en) 1977-09-30
DE2708645A1 (en) 1977-09-08

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