Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1984-07-23
1986-01-14
Scott, Samuel
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
126351, 126437, 236 24, 251 65, 25112911, F24J 302
Patent
active
045640033
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a solar/gas heater particularly adapted for heating the water to provide hot water in a domestic situation.
BACKGROUND OF THE INVENTION
At the present time there has been developing a great interest in the utilization of solar heat for the supply of domestic hot water, and many of these systems are incorporated with an electrical heating system to maintain a satisfactory supply of hot water during periods when there is insufficient solar energy absorbed by the solar heating panel to maintain a satisfactory hot water supply. Also solar/gas storage systems are presently available.
However while these are satisfactory, many homes are supplied with a gas supply, either being reticulated or being supplied by storage cylinders and it is an object of this invention to provide a suitable instantaneous type gas domestic water heater.
STATEMENT OF THE INVENTION
In a broad form of the invention there is provided a gas domestic hot water system connected to a water supply, the water passing through a heating tube assembly adapted to be heated by a gas burner. The outlet from the heating tube assembly is connected to a flow switch and a temperature sensing device, the flow switch being connected through an electrical control system to operate a main gas control to control the flow of gas which is ignited on sensing of the flow of hot water with the temperature sensing controlling the control valve to regulate the flow of gas to the main burner.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagrammatic drawing of the invention,
FIGS. 2(a) and 2(b) are a circuit diagram of the control unit,
FIG. 3 shows a gas control valve, and
FIG. 4 shows a magnetic flow switch.
In a preferred form of the invention the electrical circuit is provided with rechargeable batteries 1 continuously rechargeable by charger 2 supplied by electrical mains power supply so that even in the event of an electrical mains power failure the unit is still operable.
In operation as soon as there is a flow of hot water through hot water outlet 3a flow switch 4 is activated by the flow of hot water which then in turn activates a main gas valve 5 to allow a flow of gas to the pilot jet 6 and to initiate an igniter 7 through igniter control 8 to ignite the pilot flame. Upon ignition an iron rod sensing device 9 senses the flame and in turn activates a main control 10 which then opens the control and gas control valve 11 by a motor drive 12 to supply the gas to the main burner 13. The main electrical control 10 is under the influence of a temperature sensing unit 14 which senses the temperature of the water passing outwardly from the heating tube assembly 15 to thus activate the motorized control 12 to operate gas control valve 11 to regulate the flow of gas to the main burner 13 to maintain the outlet water temperature at a satisfactory level.
The motorized control and gas control valve is under the control of a motor control unit which is adapted to drive the motor controlling the gas control valve with a pulsing movement. Thus a dead zone is selected within which the value of the controlled variable results in the controller remaining inactive. The temperature sensing device which is connected to the motor control unit determines whether the value lies in the dead zone in which case no pulsing occurs, the value lies below the dead zone in which case pulsing occurs to open the gas control valve or the value lies above the dead zone in which case pulsing occurs to close the gas control valve. The controller can be adjusted so that the angle turned per pulse is essentially fixed but the pulse frequency can be adjusted manually or automatically. Alternatively the pulse frequency can be fixed but the angle turned is adjustable either manually or automatically and in a third alternative the cycle time is essentially fixed but the angle turned/time off relationship is adjusted manually or automatically.
Thus the temperature control circuit is intended to simulate the time constants involved in the gas part of the system thereby
REFERENCES:
patent: 1338644 (1920-04-01), Arthur et al.
patent: 2122821 (1938-07-01), Mohr
patent: 3446986 (1969-05-01), Cox
patent: 3670807 (1972-06-01), Muller
patent: 3815813 (1974-06-01), Charron et al.
patent: 4061132 (1977-12-01), Ashton et al.
patent: 4159017 (1979-06-01), Novi
patent: 4257397 (1981-03-01), Gouyou-Beauchamps
Duane Brian
Iwanicki Walter
Flanigan Allen J.
Scott Samuel
The Commonwealth of Australia
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