System and methods for modulating gas input to a gas burner
First Claim
1. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
- converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor; and
controlling gas flow to the burner in response to the pressure signal.
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Accused Products
Abstract
An improved gas appliance having a burner, a gas valve through which the flow of combustion gas to the burner is controlled, and a motor driven blower that supplies combustion air to the burner. The improvement includes means for increasing gas flow through the gas valve as blower speed increases, and decreasing gas flow through the gas valve as blower speed decreases, based on a pressure signal generated independently of combustion air pressure. This improvement allows a constant ratio of gas to air to be maintained in the burner while a combustion flow rate varies dependent on the blower motor revolutions per minute. Thus input pressures of combustion can be controlled at low cost.
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Citations
29 Claims
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1. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor; and
controlling gas flow to the burner in response to the pressure signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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driving a pump to output a pressure that varies with and is substantially proportional to the blower motor speed; and
inputting the pressure to the gas valve. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising using the blower motor to drive a pressure signal input to the gas valve;
- wherein the pressure signal input is produced without sampling a combustion stream downstream of the burner.
- View Dependent Claims (18, 19, 20, 21, 22)
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23. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor; and
using a pump driven by the blower motor to transmit the pressure signal to the gas valve to control gas flow to the burner based on the pressure signal.
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24. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor using the drive shaft to drive a pump; and
controlling gas flow to the burner based on the pressure signal.
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25. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor using the drive shaft to drive a pump; and
the pump inputting the pressure signal to the gas valve to control gas flow to the burner based on the pressure signal.
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26. A method for controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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converting revolutions of a drive shaft of the blower motor into a pressure signal substantially proportional to the speed of the blower motor using the drive shaft to drive a pump;
controlling gas flow to the burner based on the pressure signal; and
changing a speed of the blower motor to change a pressure of the pump.
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27. A method of controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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driving a pump with the blower motor to output a pressure that varies with the blower motor speed; and
inputting the pressure to the gas valve.
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28. A method of controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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using the blower motor to drive a pump on the blower motor shaft to create a pressure signal; and
inputting the pressure signal to the gas valve.
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29. A method of controlling the flow of gas to the burner of a gas combustion system, the combustion system including a gas valve through which the flow of gas to the burner is controlled and a motor-driven blower for providing combustion air to the burner, said method comprising:
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mounting a pump on the blower motor shaft; and
using the blower motor shaft to draw air into and push the air out of the pump, so as to drive a pressure signal input to the gas valve.
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Specification