Flow sensor furnace control
First Claim
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1. In a heating system having a combustion chamber with a fuel burner, an induced draft air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:
- means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere;
an electronic flowmeter disposed in said single internal chamber for directly sensing the rate and direction of flow through the chamber and producing electrical output signals indicative thereof;
means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated.
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Abstract
Disclosed is a heating system having a combustion air blower, a fuel valve for providing fuel to a burner, and an exhaust stack for exhausting combustion products. Also disclosed is flow sensor apparatus operatively associated with the stack for providing control signals to a furnace control, the control signals being related to flow conditions in the stack.
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Citations
27 Claims
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1. In a heating system having a combustion chamber with a fuel burner, an induced draft air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:
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means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere; an electronic flowmeter disposed in said single internal chamber for directly sensing the rate and direction of flow through the chamber and producing electrical output signals indicative thereof; means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14)
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8. In a heating system having a combustion chamber with a fuel burner, an induced air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:
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means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere; an electronic flowmeter disposed in said single internal chamber for directly sensing the rate and direction of flow through the chamber and producing electrical output signals indicative thereof; conductor means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated; and means disposed in said exhaust stack and fixed in spaced relation to said opening in the wall of said exhaust stack to dynamically reduce the static internal stack pressure at said opening. - View Dependent Claims (9, 10, 11, 12, 13, 15)
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16. In a heating system having a combustion chamber with a fuel burner, an induced draft air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:
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means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere; an electronic flowmeter disposed in said chamber for directly sensing the rate and direction of flow through said chamber and producing electrical output signals indicative thereof, said flowmeter comprising; a thin film heater suspended in air; and a pair of thin film heat sensors suspended in air and disposed on opposite sides of the heater; and means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated. - View Dependent Claims (17, 18, 19, 20, 21)
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22. In a heating system having a combustion chamber with a fuel burner, an induced air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:
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means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere; an electronic flowmeter disposed in said chamber for directly sensing the rate and direction of flow through said chamber and producing electrical output signals indicative thereof, said flowmeter comprising;
a thin film heater suspended in air; anda pair of thin film heat sensors suspended in air and disposed on opposite sides of the heater; conductor means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated; and means disposed in said exhaust stack and fixed in spaced relation to said opening in the wall of said exhaust stack to dynamically reduce the static internal stack pressure at said opening. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification