System and methods for modulating gas input to a gas burner
First Claim
1. 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 which supplies combustion air to the burner, the improvement comprising means for increasing the flow of gas through the gas valve as the blower speed increases, and decreasing the flow of gas through the gas valve as the blower speed decreases, based on a control pressure that is generated independently of the combustion air pressure and is input to the gas valve.
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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.
47 Citations
13 Claims
- 1. 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 which supplies combustion air to the burner, the improvement comprising means for increasing the flow of gas through the gas valve as the blower speed increases, and decreasing the flow of gas through the gas valve as the blower speed decreases, based on a control pressure that is generated independently of the combustion air pressure and is input to the gas valve.
- 3. 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 which supplies combustion air to the burner, the improvement comprising a controller configured to increase the flow of gas through the gas valve as the blower speed increases, and decrease the flow of gas through the gas valve as the blower speed decreases, based on a pressure signal input to the gas valve and having pressure capable of exceeding the combustion air pressure.
- 11. In combination with a gas appliance having a burner, a gas valve through which the flow of gas to the burner is controlled based on a pressure signal, a motor-driven blower for providing combustion air to the burner, and a controller for controlling the flow of gas through the gas valve, a pump configured to provide a pressure signal to the controller dependent on blower motor speed, said pump further configurable to provide pressure signals sufficient to operate appliances utilizing a plurality of types of gas.
Specification