IL41656A

IL41656A - Device for controlling a gas burner

Info

Publication number: IL41656A
Application number: IL41656A
Authority: IL
Original assignee: Cepem
Priority date: 1972-03-03
Filing date: 1973-03-01
Publication date: 1977-04-29
Also published as: NL7302946A; US3845582A; AT332510B; IL41656A0; GB1415205A; ATA173273A; CA977854A; BE795609A; IT979347B

Description

Device for controlling a gas burner COMPAGNIE EUROPEENNE POUR L'EQUIPEMENT MENAGER , CEPEM The Invention concerns, in a general way, the controlling of gas burners, and more particularly the controlling of gas burners to kitchen range work benches when these burners are covered.

It is sometimes an advantage to obtain very slight calorific effets for stewing or keeping prepared dishes hot.

A convenient way of doing this consists in controlling on an on-off basis more particularly when covered radiating surface-combustion burners are used. It must then be possible to re-light the burners at each cycle, and to have available a means for checking to see that lighting has actually been effected and for stopping the gas input to the burner in the case of accidental extinguishing.

Lightin may be caused directly by an electric spark (induction or piezoelectric) generating device, or even by an electrical resistor brought to a high temperature; it is then necessary to check the lighting of the flame by means of a device having no inertia, for example, by using the electrical properties of ionised gases, or the light radiation emitted by that flame; it is also possible to use a gas pilot placed close to the burner.

The invention has for its object the provision of a device for controlling gas burners, enabling the calorific output, that is, the heating rate of the said burner, to be adjusted, comprising the following elements: a device for lighting the gas burner and a safety device, further characterised in that the device for controlling comprises an energy regulator which adjusts the heating rate by alternate lighting and extinguishing of the said burner and ensures, on the one hand and in a cyclic manner, the electrical supply of a gas inlet electrovalve for the said burner and, on the other hand, continuously, at the instant of starting up, the electrical Other characteristics and advantages will become apparent from the following description of exam les of embodiment illustrated by the accompanying drawings, in which: Pig. 1 is a wiring diagram of a control device using an energy regulator comprising a bipolar cut-out means; and Pig. 2 is a wiring diagram of a control device using a singlepole energy regulator and thermostatic element.

In Fig. 1, B is a burner whose gas supply is dependent on an electro-valve EV2; V is a pilot whose gas inlet is dependent on an electro-valve EVl, ISM is a safety device in the form of a mercury type safety switch having a mercury containing tank S heated by the pilot V, RT is a time dela rela and RE is an energy regulator having a bipolar cut-out means fed by an alternating current mains, G is an induction type spark generator sending out 10 to 500 sparks per minute between an electrode E and the body of the pilot V electrically connected to ground; an indicator light Ll enables the operation of the spark generator G to be indicated, or the user to be warned, when the pilot, being extinguished, the safety device ISM stop the inpu of gas to the burner B and to the pilot V; an indicator light L2 connected with th energ regulator RE on the side on which the electro-valve EV2 is installed enables the lighting or extinguishing of the burner B to be indicated.

The operation of the device is as follows: The user starts up the burner by starting u the energy regulator RE by means of a control knob M, and sets that knob to obtain the operating rate required, the said knob acting on a cam C for adjusting the distance of the bi-metallic strip bi of the energy regulator; such a regulator is known per se and the operating thereof gives the man in the art no difficulty; the coil 1 of the electrovalve EVl is then fed through a break contact Rl of the time delay relay RT; the spark generator G being of the safety device ISM, provides for the lighting of the pilot V which heats the tank S of the safety device ISM, this establishing make contacts T2 and T3 of the said device? the said tank S is placed in such a way that it is heated by the pilot and not by the burner. The contact T2 enables the feeding of the coil 1 of the electro-valve EVi without using the time delay relay RT, at the same time as the spark generator G stops operating by the cutting off of its supply; the time delay relay then comes into action and, by its make contact Tl, enables the feeding of the coil 2 of the electro-valve EV2 , the contact T3 of the safety device ISM being closed; the burner B receiving gas is lit by the pilot V. After a certain time, the bimetallic strip bi of the energy regulator will operate, stopping the feeding of the coil 2 of the electro-valve EV2; after a certain time, the bi-metallic strip bi, having cooled down, closes the electric supply circuit of the coil 2, opening the electro-valve EV2 and the burner B operates once more.

To stop the burner, all that is necessary is to set the control knob M in the stop position, this cutting out the feeding of the energy regulator; the pilot is extinguished by the closing of the electro-valve EVI.

In Fig. 2, B is a burner whose gas inlet is dependent on an electro-valve EV2 , V is a pilot whose gas inlet is dependent on a electro-valve EVI, ISM is a mercury type safety switch having a tank S heated by the pilot V, RT is a time-delay relay and RE is an energy regulator having single pole cut-out means fed by a alternating current mains, G is an induction type spark generator sending out 10 to 500 sparks per minute between an electrode E and the body of the pilot V electrically connected to ground. Th is a thermostatic 41656/ 3 element coraprlsing an opening contact Thl placed in series in the electrical feeding circuit of the electro-valve EV2, the said eleoent being arranged so as to detect the temperature of the device heated by the burner; and indicator light L4 in parallel to the spark generator G makes it possible to indicate the operating of the said generator? an indicator light L3 in parallel to the coil of the electrovalve EV2 makes it possible to represent visually the operating of the said electro-valve, hence of the gas burner B.

The user starts up the operation of the device is as follows ehe burner by setting the energy regulator RE1 by means of a control knob H, and positions that knob to obtain the required operating rate* the said knob acting on an adjusting cam C regulating the distance of the bi-metallic strip bi of the energy regulator; such a regulator is known per se and the operating thereof gives the man in the art no difficulty; the coil 1 of the electrovalve EV1 is then fed through a break contact Rl of the time delay relay RT; the spark generator G being fed through a break contact R2 Of the safety device ISM provides for the lighting of the pilot V which heats the tank S of the safety inverter ISM, this bringing make contacts T2 and T3 of the said invertor into play; the said tank S is placed so that it is heated by the pilot and not by the burner. The contact T2 enables the feeding of the coil 1 of the electrovalve EV1 without using the time delay relay RT, at the same time as the spark generator stops operating due to the stopping of its electricity supply; the time delay relay then comes into action and, by its make 41656/2 contact Tl, enables the feeding of the coil 2 of the electro-valve EV2, the contact T3 of the safety invertor ISM being closed; the burner B receiving If the temperature of the device heated by the burner B axceeds a certain value detected by the thermostatic element Th, the operation of the latter causes the opening of its contact Thl, this stopping the electricity supply of the electro-valve EV2 of the gas burner B, hence the input of gas to the said burner stops, as long as the contact Thl is not closed, that is, as long as the temperature of the device protected by the thermostatic element Th has not returned to a value lower than the operation value of the said element Th; when the temperature has lowered, the contact Thl closes and the electro-valve is again fed through the energy regulator.

To stop the burner, all that is needed is the setting of the control knob M in the stop position, this stopping the supply to the energy regulator? the pilot is extingutehed by the closing of the electro-valve EVl.

The thermostatic element may be constituted by any device such as, for example, a thermo-electric couple or a thermistance connected with that relay having an opening type 41656/ 3 / contact, or it nay even be constituted by a safety invertor similar to the ; device ISM for controlling the lighting of the pilot.

The device according to the invention is applied to any burner whose heating rate is to be controlled, that is, in which the calorific output is to be modulated, by adjusting the lighting and extinguishing periods, as is the case in numerous appliances such as ovens, water-heaters, water or air heat generators, hot-plates made of metallic or refractory materials, with which kitchen ranges, for example, are equipped; when the burner is covered, as is the case, for example, in certain kitchen ranges, the burner and the pilot will, to great advantage, be of the full air type.

The energy regulator may be fed also through a timing device TD which will regulate the total operating time of the gas burner; The timing device controls the starting up of the burner at a determined instant and the stopping of that burner at a determined instant in a well-known the heating rate being fixed by fthe positioning of the energy regulator by means of the manual control know M.

It must be understood that the invention is in no way limited to the examples of embodiment described and illustrated and that it would be possible, without going beyond the scope of the invention, to replace certain means by equivalent means.

Claims

41656/3 CL&IMS

1. In a gas burner system including a main burner and a pilo burner for lighting said main burner, a safety device for controlling said main burner comprising a first gas inlet electro-valve for supplying gas to said main burner, a safety device including switch means and heat responsive means in close proximity to said pilot burner for operating said switch means in response to a pilot flame, a time dela switch, and energy regulator means connected to energize said first gas inlet electro-valve through said time delay switch and said safety device switch means, said energy regulator means including electrically heated bi-metallic switch means for intermittently opening and closing the circuit to said first gas inlet electro-valve, thereby adjusting the heating rate of said main burner by alternately lighting and extinguishing said main burner in a cyclic manner, said time delay switch being continuousl energized through said energy regulator means when it is turned on.

2. A device for controlling said main burner according to claim 1, further comprising a second gas inlet electro-valve, said second gas inlet electro-valve being initially connected to said energy regulator means through said time delay switch wherein said second electro-valve is energized through said energy regulator means and said delay switch when said energy regulator means is turned on and after the operation of said time delay switch said second gas inlet electro-valve being connected to said energy regulator means through said safety device switch means, said first electro-valve being disconnected from said energy regulator by said safety inverter switch means if said pilot means is extinguished thereby 41656/3 ^

3. A device for controlling said main burner according to claim 1 wherein bi-metallie strip is heated by a resistor supplied with electric current through an opening contact of the said bi-metallic strip.

4. A device for controlling said main burner according to claim 1 wherein said energy regulator means is a bi-polar cut-out regulator.

5. A device for controlling said main burner according to claim 1 wherein said energy regulator means is a single-pole cut out regulator.

6. A device for controlling said main burner according to claim 1 further comprising a thermostatic temperature detection means for a device heated by said main burner wherein an opening contact of said thermostatic means is inserted in series in the electric supply circuit of said first gas inlet electro-valve of said main burner.

7. device for controlling said main burner according to claim 4 , f rther including a timing device inserted in a supply means for said energy regulator means. For the Applicants ARTNERS