GB2310963A - Heater for a cooker - Google Patents

Heater for a cooker Download PDF

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Publication number
GB2310963A
GB2310963A GB9604891A GB9604891A GB2310963A GB 2310963 A GB2310963 A GB 2310963A GB 9604891 A GB9604891 A GB 9604891A GB 9604891 A GB9604891 A GB 9604891A GB 2310963 A GB2310963 A GB 2310963A
Authority
GB
United Kingdom
Prior art keywords
heater
heating element
cooker
energy regulator
hotplate
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
Application number
GB9604891A
Other versions
GB9604891D0 (en
GB2310963B (en
Inventor
John Peter Richards
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.)
Creda Ltd
Original Assignee
Creda 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 Creda Ltd filed Critical Creda Ltd
Priority to GB9604891A priority Critical patent/GB2310963B/en
Publication of GB9604891D0 publication Critical patent/GB9604891D0/en
Publication of GB2310963A publication Critical patent/GB2310963A/en
Application granted granted Critical
Publication of GB2310963B publication Critical patent/GB2310963B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0019—Circuit arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates

Description

HEATER FOR COOKER This invention relates to heaters for cookers, especially for hot plates of cookers, but the invention is also applicable to heaters for grills in cookers.
Such heaters are invariably provided with some sort of control over the heat output, to enable the user to control the heat supplied by the hotplate etc to the desired level. An energy regulator based on a bimetallic strip is very common, and this interrupts the supply when the temperature of the strip exceeds a certain value. The time over which the contacts are closed relative to the time over which they are open (the mark-space ratio) can be varied by the user. Electronic energy regulators are also known.
The impedance of the higher power heating element such as 1 to 2 kW is quite low and there are Electromagnetic Compatibility Regulations concerning the limitation of voltage fluctations and thus flicker which can be impressed on the mains, which therefore constrain the rapidity with which such heating elements can be cycled on and off. The higher power elements must be cycled slower than the lower power elements.
The invention provides a heater for a cooker, comprising a first heating element controlled by an energy regulator and arranged to be energised at low power settings, and a second heating element arranged to be energised in addition at higher power settings.
Compared to an arrangement where an energy regulator controls the cycling of the entire load, faster cycling is possible since only a part of the load is being switched, permitting better energy regulation at lower heat outputs.
Advantageously, the heater has a control such that, on rotation in one sense, only the first heating element is energised and, on rotation in the opposite sense, both heating elements are energised.
The energy regulator may be electromechanical.
The heating elements may be inner and outer elements of a hotplate.
A heater for a hotplate of a cooker, constructed in accordance with the invention, will now be described, by way of example, with reference to the accompanying circuit diagram.
The hotplate is for a cooker and has a heater consisting of a first heating element A which is physically arranged beneath the central region of the hotplate and a second heating element B which is arranged beneath an annular region of the hotplate surrounding the central region heated by the element A. The heater is controlled by a control knob (not shown) the electrical circuit of which is shown by the dotted box 1.
Heating element A is controlled by an electromechanical energy regulator 2 in the form of a bimetallic strip.
When the control knob is turned in an anti-clockwise direction, contact C A closes, energising heating element A. However, as the element heats up, a resistance coil 2 surrounding a bimetallic strip is also heated and, after around fifteen seconds, the deflection of the bimetallic strip opens contacts CA, thereby de-energising heating element A. This cools and the bimetallic strip similarly cools, allowing it to return to the position corresponding to the contact CA being closed. Typically this would happen after around fifteen seconds for a mid setting of the control. This is how the low power settings of the hotplate are controlled, the heating element A cycling on and off and the central region of the hotplate being heated. The control knob is turned further to increase the on time relative to the off time of the heating element A to vary its mark-space ratio to enable the desired amount of heat at the low power setting to be achieved. This is effected because rotation of the knob alters the setting of the overcentre spring to which the contact CA is connected.
When the knob is tumed in a clockwise direction, contact CA is closed exactly as before, but this time contact CB is closed as well, and this energises heating element B, which stays on whatever the state of the bimetallic strip, and whether the knob is at a low setting or a high setting. The degrees of higher power setting are provided by variation of the mark-space ratio of heating element A as for the lower power settings.
Because only half the heating element is cycled in this way, a more rapid cycling time is permissible and better control of the heat can be achieved in the lower power setting.
The cooker may have four hotplates with such heaters, and an additional such heater may be provided for a grill.
The heating elements A and B may be in the region of 900W each, but different values, and different splits of the total heating output are possible. For example, heating element A could be within the range of 500W to 1800W and heating element B could be in the range of 500W to 1800W.
Variations may be made without departing from the scope of the invention. Thus, the electromechanical energy regulator need not have a heating coil surrounding the bimetallic strip, but could have a ceramic heater in conductive contact with the bimetallic strip. Instead of an electromechanical energy regulator, an electronic one could be used.
In addition there is no need for the second heating element to be arranged to heat an area surrounding that heated by the first heating element. Other physical arrangements of the elements are possible. Finally, it is not essential for the heating element to be split with two parts. It could for example be split into three or more parts.

Claims (7)

1. A heater for a cooker, comprising a first heating element controlled by an energy regulator and arranged to be energised at low power settings, and a second heating element arranged to be energised in addition at higher power settings.
2. A heater as claimed in Claim 1, including a control knob arranged to energise the first heating element under the control of the energy regulator on rotation in one sense, and to energise the second heating element in addition when the control is rotated in the opposite sense.
3. A heater as claimed in Claim 1 or Claim 2, wherein the energy regulator is an electromechanical energy regulator.
4. A heater as claimed in Claim 3, in which the electromechanical energy regulator includes a bimetallic strip.
5. A heater for a cooker substantially as hereinbefore described with reference to the accompanying drawing.
6. A hotplate for a cooker incorporating a heater as claimed in any one of Claims 1 to 5.
7. A cooker incorporating a hotplate as claimed in Claim 6.
GB9604891A 1996-03-07 1996-03-07 Heater for cooker Expired - Fee Related GB2310963B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9604891A GB2310963B (en) 1996-03-07 1996-03-07 Heater for cooker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9604891A GB2310963B (en) 1996-03-07 1996-03-07 Heater for cooker

Publications (3)

Publication Number Publication Date
GB9604891D0 GB9604891D0 (en) 1996-05-08
GB2310963A true GB2310963A (en) 1997-09-10
GB2310963B GB2310963B (en) 2000-06-14

Family

ID=10790031

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9604891A Expired - Fee Related GB2310963B (en) 1996-03-07 1996-03-07 Heater for cooker

Country Status (1)

Country Link
GB (1) GB2310963B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358746A (en) * 2000-01-18 2001-08-01 Augustine Medical Inc Heater/blower unit with load control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB741789A (en) * 1952-12-09 1955-12-14 Stensholms Fabriks Ab Electric energy regulators
GB816637A (en) * 1955-12-22 1959-07-15 Proctor Electric Co Improvements relating to wattage controller system
GB939001A (en) * 1961-01-03 1963-10-09 Satchwell Controls Ltd Improvements relating to electric supply systems
US4900899A (en) * 1986-02-26 1990-02-13 E.G.O. Elektro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
EP0441139A2 (en) * 1990-02-09 1991-08-14 E.G.O. Elektro-Geräte Blanc u. Fischer Control of cooking plates
GB2253954A (en) * 1991-03-16 1992-09-23 Ceramaspeed Ltd Power level selecting switch arrangement for a heater assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB741789A (en) * 1952-12-09 1955-12-14 Stensholms Fabriks Ab Electric energy regulators
GB816637A (en) * 1955-12-22 1959-07-15 Proctor Electric Co Improvements relating to wattage controller system
GB939001A (en) * 1961-01-03 1963-10-09 Satchwell Controls Ltd Improvements relating to electric supply systems
US4900899A (en) * 1986-02-26 1990-02-13 E.G.O. Elektro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
EP0441139A2 (en) * 1990-02-09 1991-08-14 E.G.O. Elektro-Geräte Blanc u. Fischer Control of cooking plates
GB2253954A (en) * 1991-03-16 1992-09-23 Ceramaspeed Ltd Power level selecting switch arrangement for a heater assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358746A (en) * 2000-01-18 2001-08-01 Augustine Medical Inc Heater/blower unit with load control
US6355915B1 (en) 2000-01-18 2002-03-12 Augustine Medical, Inc. Heat/blower unit with load control
US6541740B2 (en) 2000-01-18 2003-04-01 Augustine Medical, Inc. Heater/blower unit with load control
GB2358746B (en) * 2000-01-18 2004-09-29 Augustine Medical Inc Heater/blower unit with load control

Also Published As

Publication number Publication date
GB9604891D0 (en) 1996-05-08
GB2310963B (en) 2000-06-14

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20060307