Gas regulating system

Abstract: The air-gas regulating system adjusts the speed of the vent depending upon the needs of the installation. As a result, a multifunctional gas valve delivers the correct amount of gas for the correct combustion value, which is controlled by the ionization electrode.

Description: The present invention refers to a gas regulating system. Usually a gas regulating system is integrated in an EP 1 026 446 A1. Air-gas regulating system which adjusts the speed of the vent depending upon the needs of the installation for heat. As a result, a multifunctional gas valve delivers the correct amount of gas for the correct combustion value, which is controlled by the ionization electrode. Air-gas regulating system of the type described above is disclosed in EP-A-0 909 922, in which a modulating valve is not better defined. Usually, the gas modulating valve is of the type disclosed in EP-A-0 669 499. A gas modulating valve of this type has several drawbacks mainly due to the complexity of its construction, the need for many parts, springs, openings, a membrane, the need to calibrate the system, and hysteresis generated by the magnet modulating between the rising and falling current. The object of the present invention is to provide a gas regulating system of the above mentioned type having simplified structured features and improved precision in modulating the gas. According to the present invention, it is realized a gas regulating system according to claim 1. The valve we are proposing is composed of a body normally made of aluminum, together with the usual parts for connections and for detecting the input and output pressure, a magnetic safety valve suitable for the category of the application requirements, and a second safety and modulation valve. This valve is special because it is controlled by an impulse linear motor, for example 0.1 - 0.2 mm per pulse. The linear motor opens and closes the valve at each pulse received, and safety is an integral feature: upon the appropriate command or if there is no current, it automatically shuts off the gas valve. In the modulating air-gas system, a differential analog switch detects the quantity of air for combustion, and by referencing this value, using the above valve we can consistently measure out the quantity of gas required (thermal output) without having to worry about variables in the gas, such as its thermal output (for the same family of gases), or upstream pressure. By referencing the quantity of air for combustion, the amount of gas being delivered by the valve will always comply with requirements. The modulation process is very precise, and there are no errors due to hysteresis. A multifunctional gas valve composed of an electromagnet valve and an impulse linear motor valve. As well as meeting all the safety requirements, modulating the gas, stabilizing gas pressure when the pressure upstream varies, regulating the delivery of gas if the type of gas from among the different groups of gases within the same family varies, this system is also innovative in that it is simple to build, requires no calibration, and the minimum and maximum limit values detected by the differential analog switch and stored in the memory of the microprocessor are sufficient for delivering the correct amount of gas at the maximum and minimum values. This gas valve is built like the previous valve, except that it has a pressure sensor at the output of the valve itself. It is this pressure sensor which determines the quantity of gas to be modulated, still by means of the impulse linear motor. The pressure sensor controls modulation within the required parameters, which are managed by a microprocessor, for example. This valve can also be used on natural draft boilers (which do not have a vent and differential analog switch). Using pressure as the reference parameter, the valve cannot regulate the delivery of heat if the calorific value of the gas varies. Our claims for a patent could be considered to be the same as the previous ones, with the exception of being able to regulate the delivery of heat. 1. Gas entry 2. Power point upstream 3. First gas clocking choke composed by electric magnet 4. Second clocking and gas tuning 5. Power point downstream 6. Walking gas

Claims: Gas regulating system for delivering a given amount of gas for the combustion; the gas regulating system comprising a valve body provided with an inlet and an output for the gas; a gas modulating valve arranged along the body for modulating the amount of gas fed along the body; a ionisation electrode for determining the correct combustion value; a differential pressure switch for detecting the quantity of air for combustion; a microprocessor for controlling the modulating valve and connected to the ionisation electrode and to differential pressure switch in order to determine the correct amount of gas for combustion; said microprocessor comprising a memory; the gas regulating system being characterised by comprising an impulse linear motor operated in step, driving the gas modulating valve and controlled by the microprocessor; the modulation range of the gas modulating valve being comprised between a minimum and maximum values determined by said microprocessor on the basis of the minimum and maximum values of the differential pressure switch stored in said memory. Gas regulating system according to claim 1, characterised by the fact of comprising a safety valve arranged along said body upstream of said modulating valve.

Inventors: TAGLIAFERRI MARCO ING, TAGLIAFERRI, MARCO, ING.
Applicants: RIELLO SPA, RIELLO S.P.A.
Application year: 1999
Main classification: F23N1
IPC codes: F23N5, F23N1