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  System for controlling the delivery of a fuel gas to a burner apparatusUSPTO Application #: 20060292505Title: System for controlling the delivery of a fuel gas to a burner apparatus Abstract: A system for controlling the delivery of a fuel gas to a burner apparatus includes a gas-delivery duct extending between an inlet opening and an outlet opening, a pressure-regulator device including a servo-valve in the duct, having a closure member with diaphragm control, the diaphragm being subjected, on one side, to the pressure regulated by the pressure-regulator device and, on the other side, to a calibration pressure established in a calibration chamber of the regulator device, as well as a calibration spring provided in the calibration chamber and acting on the diaphragm. The system also includes a delivery-pressure modulator unit including a modulation valve with a valve seat disposed in the duct downstream of the pressure-regulator device and cooperating with a respective closure member operatively connected to an actuator device arranged for the modulation control of the delivery pressure, as well as a flow communication device between the calibration chamber of the pressure-regulator device and the modulator unit, for bringing into the calibration chamber a pressure signal that is correlated proportionally with the gas-delivery pressure so that the pressure regulated by the pressure-regulator device is in turn correlated with the pressure signal. (end of abstract)
Agent: Ratnerprestia - Valley Forge, PA, US Inventor: Massimo Giacomelli USPTO Applicaton #: 20060292505 - Class: 431012000 (USPTO) Related Patent Categories: Combustion, Process Of Combustion Or Burner Operation, Controlling Or Proportioning Feed The Patent Description & Claims data below is from USPTO Patent Application 20060292505. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a U.S. National Phase Application of PCT International Application PCT/IT2003/000533. TECHNICAL FIELD [0002] The present invention relates to a system for controlling the delivery of a fuel gas to a burner apparatus. TECHNOLOGICAL BACKGROUND [0003] The invention relates particularly to the field of systems for controlling the delivery of gas to burners of heating apparatus in general, the flame of which is intended for the direct heating of the environment rather than of an intermediate fluid circulating in a system with a boiler. [0004] Apparatus of this type, like all systems using a gas burner, usually has a system for controlling the delivery of the gas-flow to the burner so as to regulate its delivery pressure and/or the flow-rate of gas delivered, in controlled manner. These systems are therefore typically directed towards a multifunctional control of the gas-flow delivered to the burner and at the same time have to ensure the functions of regulation and safety shutoff of the gas-way in addition to that of modulation of the pressure (or of the flow-rate delivered) in relation to predetermined parameters. [0005] It is known in this field to provide systems which have a pressure regulator for keeping the pressure downstream of the regulator constant irrespective of the gas-supply pressure, and a modulator unit with a delivery-pressure modulation valve, disposed downstream of the regulator. In this case, the modulation valve operates between a pressure upstream of the modulator, which is equal to the pressure regulated by the pressure regulator, and a pressure downstream of the modulator, which is equal to the delivery pressure of the gas-flow towards the burner. [0006] In systems of the above-mentioned type, for a preselected calibration, the pressure regulated by the pressure regulator is substantially constant as the gas-delivery pressure varies, thus defining a predetermined degree of resolution of the modulation, "resolution" being understood as the index of the so-called "discretization" (i.e. rendering discrete) of the delivery pressure that can be achieved by a modulation valve with a finite number of levels, such as the valves which are typically used in these applications. BRIEF DESCRIPTION OF THE INVENTION [0007] A main object of the present invention is to provide a system for controlling the delivery of a fuel gas to a burner apparatus in which, for given parameters of the system, the resolution is improved, with an amplification of the level of "discretization" of the delivery pressure such as to permit a more precise and reliable modulation of the pressure (flow-rate). [0008] The foregoing and other objects are achieved by the invention by means of a system for controlling the delivery of a fuel gas to a burner apparatus. The system includes a gas-delivery duct extending between an inlet opening and an outlet opening, and a pressure-regulator device including a servo-valve in the duct, having a closure member with a diaphragm control. The diaphragm being subjected, on one side, to the pressure regulated by the pressure-regulator device and, on the other side, to a calibration pressure established in a calibration chamber of the pressure-regulator device. A calibration spring is provided in the calibration chamber and acts on the diaphragm. The system also includes a delivery-pressure modulator unit including a modulation valve with a valve seat disposed in the duct downstream of the pressure-regulator device and cooperating with a respective closure member operatively connected to actuator means arranged for the modulation control of the delivery pressure, and a flow communication means between the calibration chamber of the pressure-regulator device and the modulator unit, for bringing into the calibration chamber a pressure signal that is correlated proportionally with the gas-delivery pressure so that the pressure regulated by the pressure-regulator device is in turn correlated with the pressure signal. BRIEF DESCRIPTION OF THE DRAWINGS [0009] The characteristics and the advantages of the invention will become clearer from the following detailed description of two preferred embodiments thereof which are described by way of a non-limiting example with reference to the appended drawings, in which: [0010] FIG. 1 is a schematic view showing a first embodiment of the control system according to the invention, in longitudinal section, [0011] FIG. 2 is a view corresponding to FIG. 1 of a second embodiment of the system according to the invention, and [0012] FIG. 3 is a graph representative of the system according to the invention. PREFERRED METHOD OF IMPLEMENTING THE INVENTION [0013] In the above-noted drawings, a main duct for the transfer of fuel gas (hereinafter referred to simply as gas) from a delivery element to a burner apparatus (neither of which is shown) is indicated by the numeral 1. The duct 1 extends between a gas-inlet opening 2 and an opening 3 for the outlet of the gas towards the burner. The supply pressure and the delivery pressure of the gas are indicated Pi and Pu, respectively. [0014] The body of a pressure-regulator device, generally indicated 4, is formed in the duct 1; the device 4 includes a servo-valve defining a valve seat 5 cooperating with a closure member, shown schematically at 6, the control rod 6a of which is connected rigidly to a diaphragm 7 for operating the rod 6a. [0015] The diaphragm 7 is subjected, on one side, to the pressure which is regulated by the regulator device 4 and which is indicated Pr and, on the other side, to a pressure established in a calibration chamber 8 of the regulator. As will be described in detail below, the pressure acting on the diaphragm in the chamber is defined partly by the resilient load exerted by a calibration spring 9 housed in the chamber 8. The resilient load acting on the diaphragm 7 is adjustable by means of an adjustment screw 10. The pressure exerted on the diaphragm 7 by the spring 9 is referred to below as Pt. [0016] The system according to the invention also has a unit, generally indicated 11, for modulating the delivery pressure Pu; the unit 11 is provided in the duct 1, downstream of the pressure regulator 4. The modulator unit comprises a modulation valve with a valve seat 12 cooperating with a closure member 13 which is operatively connected to actuator means for the modulation control of the delivery pressure Pu. [0017] The closure member 13 has a control rod 13a the axial movement of which relative to the valve seat 12 is brought about by drive means, shown schematically and indicated as 14[,] (for example, of the stepping type), in a manner such that the regulation of the closure member 13 is of the proportional type with a finite number of modulation levels. Transmission means are provided between the drive means 14 and the rod 13a and comprise, for example, a male-and-female screw coupling arranged for converting the rotary movement of the drive means into the translational movement of the rod. [0018] The above-mentioned modulation valve may be of the type described in the Applicant's Italian patent application No. PD 2001A000240, the description of which is therefore included herein by reference for any further characteristic not expressly mentioned. [0019] An electronic board, schematically indicated 15, carries a respective circuit assembly arranged for controlling the actuator means and consequently for controlling the modulation function performed by the modulator unit. Continue reading... Full patent description for System for controlling the delivery of a fuel gas to a burner apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this System for controlling the delivery of a fuel gas to a burner apparatus patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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