Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K5/00—Feeding or distributing other fuel to combustion apparatus
  • F23K5/002—Gaseous fuel
  • F23K5/007—Details
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N1/00—Regulating fuel supply
  • F23N1/005—Regulating fuel supply using electrical or electromechanical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K2400/00—Pretreatment and supply of gaseous fuel
  • F23K2400/20—Supply line arrangements
  • F23K2400/201—Control devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2235/00—Valves, nozzles or pumps
  • F23N2235/12—Fuel valves
  • F23N2235/14—Fuel valves electromagnetically operated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2235/00—Valves, nozzles or pumps
  • F23N2235/12—Fuel valves
  • F23N2235/18—Groups of two or more valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2235/00—Valves, nozzles or pumps
  • F23N2235/12—Fuel valves
  • F23N2235/20—Membrane valves
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7758—Pilot or servo controlled
  • Y10T137/7761—Electrically actuated valve
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7781—With separate connected fluid reactor surface
  • Y10T137/7793—With opening bias [e.g., pressure regulator]

Definitions

• the present invention concerns a device for controlling the delivery of a combustible ' gas to a burner apparatus, according to the characteristics mentioned in the preamble of main claim 1.
• the invention is placed particularly, but not exclusively, in the field of devices for the multi-functional control of the delivery of combustible gases in valve units arranged for use in heating apparatus such as stoves and fireplaces, in which there is a need to ensure the operation thereof also in the absence of the mains electrical supply for a certain period of time.
• provision is made for associating a magnetic thermocouple safety unit with a corresponding system with manual arming with a servovalve having an electromagnetic operating means for the control of a servo-assisted gas circuit (servo circuit), the electrical supply to which is guaranteed by the thermoelectricity generated by a thermopile heated in parallel with the thermocouple by the pilot burner.
• servo circuit servo-assisted gas circuit
• the problem underlying the present invention is that of providing a device for controlling the delivery of a combustible gas to a burner apparatus, structurally and functionally designed so as to allow the limitations mentioned with reference to the prior art cited to be overcome.
• Figure 1 is a view in longitudinal section of a first example of a device produced according to the present invention
• Figure 2 is a view in longitudinal section of a second example of the device according to the invention.
• Figure 3 is a view in longitudinal section of a third example of a device according to the invention.
• Figures 4 to 6 are diagrammatic views of the devices respectively of Figures 1 to, 3, - Figure 7 is a view corresponding to those in Figures 4 to 6 of a device according to the prior art,
• Figures 8 and 9 are views respectively in longitudinal section and diagrammatic view of a fourth exemplary embodiment of the invention
• - Figures 10 and 11 are views respectively in longitudinal section and diagrammatic view of a fifth exemplary embodiment of the invention
• Figures 12 and 13 are views respectively in longitudinal section and diagrammatic view of a sixth exemplary embodiment of the invention
• Figure 14 is a capacity/pressure diagram for the configurations of the devices of the preceding figures
• FIG 15 is a diagrammatic view of a further variant of the invention.
• the reference 1 indicates as a whole a first example of a device for controlling the delivery of a combustible gas to a burner apparatus,- such as a fireplace or similar use, produced according to the present invention.
• the device 1 comprises a valve unit disposed in a main gas delivery pipe 2, between a gas inlet section 3 and an outlet section 4 where the gas is fed to a main burner, not shown in the drawing.
• Each servovalve 5, 6 comprises a respective servo circuit including a respective valve seat 5a, 6a associated with a corresponding and respective shut-off means 5b, 6b with diaphragm control 5c, 6c, for the opening of the seats 5a, 6a, in opposition to respective resilient return means, such as respective springs 5d, 6d.
• the first servovalve 5 performs the function of on-off valve for the safety closure of the main gas pathway and is associated with a solenoid valve for controlling the servo assistance circuit, and indicated by 7, being placed for opening/closure of a control pipe 8 of the servo circuit, which constitutes the intake pipe for the pressure signal to be transmitted to the control chamber of the servo circuit, as will appear in detail in the continuation of the description.
• the diaphragm 5c acts directly on the control stem 5e of the shut-off means 5b, which is in its turn urged to close the seat by the spring 5d.
• One side of the diaphragm 5c defines a control chamber 10, which communicates with the main pipe 2, upstream of the servovalve 5, by means of the control pipe 8. More particularly, in the pipe 8 there is identified a first portion 8a, communicating with the inlet section 3 and on which is disposed the solenoid valve 7, and a second portion 8b, in prolongation of the preceding portion, communicating with the chamber 10. At the solenoid valve 7, the relevant portion of pipe 8 is selectively opened or closed by means of an electromagnet 11, of the on-off type with resilient return, acting on a shut-off member 12 associated with the passage cross- section of the pipe 8 and displaceable from and towards a position for blocking the passage cross-section.
• an electromagnet 11 of the on-off type with resilient return
• the second portion 8b of the pipe 8 also communicates with a control pipe 9 of the second servovalve 6. More particularly, the pipe 9 comprises a first portion 9a communicating with the portion 8b and a second portion 9b, in prolongation of the first portion 9a, communicating with the respective control chamber 17 of the second servovalve. Between the portions 9a and 9b is disposed in the pipe 9 a second solenoid valve 13, arranged for the servo assistance control of the second servovalve 6.
• the relevant portion of pipe 9 is selectively opened or closed by means of an electromagnet 14, of the on-off type with resilient return, acting on a shut-off member 15 associated with the passage cross- section of the pipe 9 and displaceable from and towards a position for blocking the passage cross-section.
• both the intake pipes 8, 9 of the respective control chambers 10, 17 are both connected, in fluid communication, with the main pipe 2, upstream of the first servovalve 5.
• the reference 16 indicates an optional auxiliary pilot pipe which extends from the main pipe 2 at a section thereof lying between the valve seats 5a, 6a of the respective servovaives, the auxiliary pipe being arranged for supplying a pilot burner, not shown in the drawing.
• the control chamber 10 is also connected with a section of the main pipe 2 lying between the valve seats 5a, 6a, by means of a pipe 8c, on which a constriction 20 is further provided.
• a second constriction arranged in the portion 9b of the control pipe 9 is indicated by 21.
• the second control chamber 17 is connected with the outlet section 4 of the main pipe 2, downstream of the valve seat 6a of the second servovalve, by means of a respective discharge pipe 18, on which there may also be provided a pressure regulator, indicated as a whole by 22.
• This is a diaphragm pressure regulator, conventional in itself, in which one diaphragm side defines a control chamber 23 communicating, by means of a part 18a of the pipe 18, with the outlet section 4 of the main pipe 2 (downstream of the servovalve 6) and is also capable of blocking the outlet cross-section of the other part 18b of pipe 18 communicating with the control chamber 17.
• the opposite diaphragm side is urged by a calibrating spring 25 disposed in a chamber open to the atmosphere through an opening 26.
• the pressure regulator 22 is designed to react to the variations in delivery pressure and also to compensate for same and bring the pressure to a predetermined calibration value by means of adjustment of the spring 25.
• the second electromagnet 14 is also energized, and consequently the portion 9b of the intake pipe 9 is opened to the passage of gas, and in the control chamber 17 a corresponding pressure is established, correlated with the inlet pressure, as a function of the constriction 21.
• the diaphragm 6c urged by the aforesaid pressure force, tends to lift the respective shut-off means 6b from the corresponding seat 6a, allowing the passage of gas through the main pipe 2, towards the main burner.
• the delivery pressure is further regulated by means of the diaphragm pressure regulator 22.
• Figures 4 and 7 respectively show diagrammatically the operating circuits -of the device according to the aforesaid example of the invention and of a device according to the prior art.
• each of the solenoid valves 7, 13 may also be arranged to act in controlling the opening/closure of a second shut-off means (associated with the respective first shut-off means 12, 15) acting on a respective discharge pipe.
• the discharge pipe is extended to by-pass the respective constriction (of the control circuit) until it reaches a section downstream of the corresponding servovalve and is provided to allow rapid discharge of the flow of gas from the corresponding control chamber when the first shut-off means of the solenoid valve is in the blocking position.
• the aforesaid characteristic of the double shut-off means for each solenoid valve may optionally be provided in each of the variants of the invention, described in detail hereinafter.
• the reference Ia indicates as a whole a second example of a deyice according to the invention, in which details analogous to those of the preceding example are designated by the same reference numbers.
• the control solenoid valves 7 and 13 of the respective servovalves 5 and 6 are disposed in cascade with each other along the portion 8a of the intake pipe 8, communicating with the pipe 2 upstream of the first valve 5.
• the portion 8d extends, with fluid connection, between the control chamber 10 and a section of the pipe 9 downstream of the second solenoid valve 13.
• the discharge pipe 8c of the chamber 10 extends between the latter and a section of the main pipe 2 downstream of the second servovalve 6. More particularly, the pipe 8c communicates with the portion 18a of the discharge pipe 18 of the second control chamber.
• the pilot pipe 16 is provided, in this example, so that it extends from a section of the pipe 8 lying between the solenoid valves 7 and 13 (upstream of 13 and downstream of 7).
• the opening of the first solenoid valve 7 entails the passage of gas through the pilot pipe 16, with both the valves 5 and 6 being blocked. Only by means of actuation for opening of the second solenoid valve 13, with the passage of gas into the portions 8b and 9b, is there the concomitant opening of the valves 5 and 6.
• the reference Ib indicates as a whole a third example of a device according to the invention, in which details analogous to those of the preceding examples are designated by the same reference numbers.
• the device Ib differs principally from the device 1 in that the intake pipes 8 and 9 are independent of each other.
• the portions 8a and 9a of the respective control pipes, extending upstream of the corresponding solenoid valves 7 and 13, are directly connected to the main pipe upstream of the first servovalve 5.
• gas is fed exclusively to the pilot burner.
• the reference Ic indicates as a whole a fourth example of a device according to the invention, in which details analogous to those of the preceding examples are designated by the same reference numbers.
• the device Ic analogously to the device Ib, has the intake pipes 8 and 9 for the pressure signal for the respective control circuits, structurally independent of each other and communicating directly with a section of the main pipe 2 upstream of the first servovalve 5.
• the device differs, however, in that it provides for the pilot pipe 16 communicating, at one end thereof, with the control chamber 10, the passage cross-section for the gas at that end being blocked by the shut-off member of the first control solenoid valve 7.
• the constrictions 20 and 21, in this example, are respectively provided along the pipes 8 and 9.
• the second solenoid valve 13 is further arranged to block the end of the pipe 18 communicating with the control chamber 17.
• the reference Id indicates as a whole a fifth example of a device according to the invention, in which details analogous to those of the preceding examples are designated by the same reference numbers.
• the device Id differs from the device Ic principally in that the second solenoid valve 13 is arranged to block selectively the end of the control pipe 9 at the section communicating with the control chamber 17.
• the intake pipes 8 and 9 of the control circuits for controlling the corresponding servovalves are independent of each other and are both connected directly to the main pipe upstream of the valve seat of the first servovalve 5.
• the reference Ie indicates as a whole a sixth example of a device according to the invention, in which details analogous to those of the preceding examples are designated by the same reference numbers.
• This example differs principally from the device Ic in that the first solenoid valve 7 is arranged to block, selectively the end of the control pipe 8 at the section communicating with the control chamber 10.
• the constriction 21 is provided in the intake pipe 9 of the second control circuit, while the constriction 20 is provided in the intake pipe 8.
• the intake pipes 8 and 9 of the control circuits of the corresponding servovalves are independent of each other and are both connected directly to the main pipe upstream of the valve seat 5a of the first servovalve 5.
• an electromagnetic operating means for example an electromagnet
• a reversible electric motor for example of the stepping type
• Figure 15 illustrates, by way of example, an operating diagram for a version of the device according to the invention in which the control solenoid valve 13 is not provided, and the servovalve 6 is controlled by the same device which is provided for controlling the modulation of the capacity at the burner.
• a stepping motor may for example be provided, in which the rotational motion of the rotor is conveniently transformed into a translational motion of an actuating stem acting on the spring 25 of the regulator.
• the operation may be designed as "permanent pilot” operation instead of "intermittent pilot", for reasons of energy saving in the actuation of the electromagnetic operating means.
• the invention solves the problem and achieves the aims proposed with the advantages mentioned with respect to the known solutions.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Magnetically Actuated Valves (AREA)
• Feeding And Controlling Fuel (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=36026089

Family Applications (1)

Country Status (5)

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• 2005
  • 2005-11-23 CA CA 2630767 patent/CA2630767A1/en not_active Abandoned
  • 2005-11-23 EP EP20050823562 patent/EP1952064A1/de not_active Withdrawn
  • 2005-11-23 WO PCT/IT2005/000686 patent/WO2007060696A1/en active Application Filing
  • 2005-11-23 US US12/093,281 patent/US20080268388A1/en not_active Abandoned
• 2006
  • 2006-10-31 TW TW095140115A patent/TW200720593A/zh unknown

Non-Patent Citations (1)

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