CA2762742A1 - A device for controlling the supply of fuel gas to a burner, in particular for water heater appliances - Google Patents
A device for controlling the supply of fuel gas to a burner, in particular for water heater appliances Download PDFInfo
- Publication number
- CA2762742A1 CA2762742A1 CA2762742A CA2762742A CA2762742A1 CA 2762742 A1 CA2762742 A1 CA 2762742A1 CA 2762742 A CA2762742 A CA 2762742A CA 2762742 A CA2762742 A CA 2762742A CA 2762742 A1 CA2762742 A1 CA 2762742A1
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- Prior art keywords
- duct
- main
- pressure
- gas
- pilot
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/007—Regulating fuel supply using mechanical means
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- 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
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- 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
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- 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
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- 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
- F23N2235/24—Valve details
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
A device is described for controlling the supply of fuel gas to a burner, in particular of a water heater appliance, comprising a main duct for supplying the gas between an inlet section and an outlet section, this main duct being provided with at least one main valve including a respective valve seat associated with a corresponding shutter with a respective control for the opening of the seat in opposition to a respective resilient recall member. A
pilot duct leads from the main duct downstream of the main valve in order to supply a pilot burner, the main duct being provided, upstream of the main valve, with a magnetic thermoelectric safety unit with a manually armed switch or with an automatic arming system, which acts on the pilot duct to enable the gas to flow to the pilot burner when the unit is armed and the pilot duct being provided with a pressure regulator having a shutter with a membrane control, the membrane being subject on one hand to the pressure regulated by the regulator and on the other hand to a calibration pressure determined in a calibration chamber of the regulator, a calibration spring being provided in the chamber and acting on the membrane. The device comprises fluid communication means between the calibration chamber of the pressure regulator and the main valve, in order to supply to this calibration chamber a pressure signal correlated with the gas supply pressure when supplied to the main duct such that the pressure regulated by the regulator can be regulated at least to a first level, when there is no gas supply in the main duct, and to a second level, greater than the first level, when gas is being supplied in the main duct, the flow of gas supplied to the pilot duct being correlated with the respective levels of the pressure signal supplied to the calibration chamber.
pilot duct leads from the main duct downstream of the main valve in order to supply a pilot burner, the main duct being provided, upstream of the main valve, with a magnetic thermoelectric safety unit with a manually armed switch or with an automatic arming system, which acts on the pilot duct to enable the gas to flow to the pilot burner when the unit is armed and the pilot duct being provided with a pressure regulator having a shutter with a membrane control, the membrane being subject on one hand to the pressure regulated by the regulator and on the other hand to a calibration pressure determined in a calibration chamber of the regulator, a calibration spring being provided in the chamber and acting on the membrane. The device comprises fluid communication means between the calibration chamber of the pressure regulator and the main valve, in order to supply to this calibration chamber a pressure signal correlated with the gas supply pressure when supplied to the main duct such that the pressure regulated by the regulator can be regulated at least to a first level, when there is no gas supply in the main duct, and to a second level, greater than the first level, when gas is being supplied in the main duct, the flow of gas supplied to the pilot duct being correlated with the respective levels of the pressure signal supplied to the calibration chamber.
Description
A device for controlling the supply of fuel gas to a burner, in particular for water heater appliances SPECIFICATION
The present invention relates to a device for controlling the supply of fuel gas to a burner in accordance with the features set out in the preamble of claim 1.
The invention is applied in particular, although not exclusively, in the sector of devices for the multi-function control of the supply of fuel gases to valve units designed for uses in heating appliances, in particular domestic water heater appliances.
io In a typical known solution with respect to these devices, a magnetic safety unit with a pilot and a thermocouple is associated with a relative manual arming system and with at least one valve having a mechanical or electrical operator for controlling a gas supply to a main burner directly or indirectly (servo-assisted system).
In these applications, it is also known to provide a pilot duct through which a predetermined flow of gas, correlated with the pressure regulated by a pressure regulator disposed in the pilot duct, is supplied in order to supply the pilot burner flame.
As a result, the flow supplied to the pilot burner is the same during both operation of the pilot burner alone, when the main gas throughput is intercepted, and during operation of the main burner.
It would be preferable, however, to reduce the rate of flow in the rest phases of the pilot burner, when only the pilot flame is ignited, with a view to efficient saving of fuel gas (with the pilot introducing less energy into the system), while at the same time ensuring a higher flow of gas to the pilot to facilitate ignition of the main burner.
The object of the present invention is to provide a device for controlling the supply of fuel gas to a main burner, in particular for water heater appliances, which is structurally and functionally designed to ensure levels of flow to the pilot burner which are appropriate for the various operating stages, with more efficient fuel consumption when only the pilot burner is ignited.
This object is achieved by a device for controlling the supply of fuel gas to a burner embodied in accordance with the appended claims.
Other advantages and features of the present invention will become clear from io the following detailed description of preferred embodiments thereof, given with reference to the appended drawings which are provided purely by way of non-limiting example and in which:
- Fig. 1 is a diagrammatic view in longitudinal section of a first embodiment of the control device of the invention;
is - Fig. 2 is a similar view to Fig. 1 of a second embodiment of the control device of the invention;
- Fig. 3 is a similar view to the preceding Figures of a third embodiment of the control device of the invention;
- Fig. 4 is a similar view to the preceding Figures of a fourth embodiment 20 of the control device of the invention.
With reference, first, to Fig. 1, a device for controlling the supply of fuel gas to a burner of a domestic water heater embodied in accordance with the present invention, is shown overall by 1.
The device 1 comprises a valve unit disposed in a main gas supply duct 2 25 between a gas inlet section 3 and an outlet section 4 where the gas is supplied to a main burner 4a.
A main valve, shown overall by 5, is disposed along the main duct 2. The valve comprises a valve seat 5a associated with a respective shutter 5b, for instance with membrane control 5c for the opening of the seat 5a in opposition 5 to a respective resilient recall means such as a respective spring 5d.
The valve 5 acts as an on/off valve for the safe closure of the main gas channel, as will be described in detail below.
The valve 5 may be associated with an electrovalve for controlling the servo-assisted circuit, shown by 7, disposed to open and close an auxiliary duct 8 for io driving the servo- circuit, which forms the take-up duct for the pressure signal to be transferred to the drive chamber of the servo-circuit. The membrane 5c acts directly on a control stem 5e of the shutter 5b which is in turn urged to close the seat by the spring 5d.
One side of the membrane 5c defines a drive chamber 10 which communicates with the main duct 2, upstream of the valve 5, via the duct 8.
More particularly, the duct 8 has a first portion 8a, extending upstream of the electrovalve 7, and a second portion 8b, prolonging the first, extending downstream of the electrovalve 7 and communicating with the chamber 10. A
throttle 30 is provided in the duct portion 8b.
The drive chamber 10 is connected to the main duct 2, downstream of the valve seat 5a of the valve 5, by a respective discharge duct 28 in which a pressure regulator, shown overall by 32, is provided. The regulator is a membrane pressure regulator, known per se, in which one side of the membrane defines a drive chamber 33 communicating, by means of a portion 28a of the duct 28, with the main duct 2 (downstream of the valve 5) and is also able to intercept the output section of the other portion 28b of the duct communicating with the drive chamber 10. The opposite side of the membrane is urged by a calibration spring 35 disposed in a chamber open to atmosphere via an opening 36. The pressure regulator 32 is designed to react to the supply pressure variations and to compensate them and return the pressure to a calibration value predetermined by regulation of the spring 35.
The pressure regulator 32 may also be designed with a pressure modulation function, for instance as a modulating regulator of electromagnetic type (by means of a motor, linear actuator) or of pneumatic (membrane) type.
io At the location of the electrovalve 7, the relative portion of the duct 8 may be opened and closed at will by an electromagnet 11, of on/off type with resilient recall, acting on a shutter member 12 associated with the throughput section of the duct 8 which may be displaced to and from a position intercepting the throughput section.
The valve unit of the device of the invention comprises an auxiliary gas line, branching from the main line, via which a pilot burner 16 is supplied. The auxiliary line has a pilot duct 16a which branches from the main duct 2 in order to supply the pilot burner 16.
Starting from the inlet section, in the main duct: 2, there is a first section 18' prolonged by a second section 18" via an interposed valve seat 18, on which a magnetic thermoelectric safety unit with manual arming 20 (or, as an alternative, with an automatic arming system) acts, this unit including a shutter 18a which is held in the position opening the seat 18 by the excitation of the magnetic unit generated by the voltage of a thermocouple (not shown) when there is a flame at the pilot burner 16.
The present invention relates to a device for controlling the supply of fuel gas to a burner in accordance with the features set out in the preamble of claim 1.
The invention is applied in particular, although not exclusively, in the sector of devices for the multi-function control of the supply of fuel gases to valve units designed for uses in heating appliances, in particular domestic water heater appliances.
io In a typical known solution with respect to these devices, a magnetic safety unit with a pilot and a thermocouple is associated with a relative manual arming system and with at least one valve having a mechanical or electrical operator for controlling a gas supply to a main burner directly or indirectly (servo-assisted system).
In these applications, it is also known to provide a pilot duct through which a predetermined flow of gas, correlated with the pressure regulated by a pressure regulator disposed in the pilot duct, is supplied in order to supply the pilot burner flame.
As a result, the flow supplied to the pilot burner is the same during both operation of the pilot burner alone, when the main gas throughput is intercepted, and during operation of the main burner.
It would be preferable, however, to reduce the rate of flow in the rest phases of the pilot burner, when only the pilot flame is ignited, with a view to efficient saving of fuel gas (with the pilot introducing less energy into the system), while at the same time ensuring a higher flow of gas to the pilot to facilitate ignition of the main burner.
The object of the present invention is to provide a device for controlling the supply of fuel gas to a main burner, in particular for water heater appliances, which is structurally and functionally designed to ensure levels of flow to the pilot burner which are appropriate for the various operating stages, with more efficient fuel consumption when only the pilot burner is ignited.
This object is achieved by a device for controlling the supply of fuel gas to a burner embodied in accordance with the appended claims.
Other advantages and features of the present invention will become clear from io the following detailed description of preferred embodiments thereof, given with reference to the appended drawings which are provided purely by way of non-limiting example and in which:
- Fig. 1 is a diagrammatic view in longitudinal section of a first embodiment of the control device of the invention;
is - Fig. 2 is a similar view to Fig. 1 of a second embodiment of the control device of the invention;
- Fig. 3 is a similar view to the preceding Figures of a third embodiment of the control device of the invention;
- Fig. 4 is a similar view to the preceding Figures of a fourth embodiment 20 of the control device of the invention.
With reference, first, to Fig. 1, a device for controlling the supply of fuel gas to a burner of a domestic water heater embodied in accordance with the present invention, is shown overall by 1.
The device 1 comprises a valve unit disposed in a main gas supply duct 2 25 between a gas inlet section 3 and an outlet section 4 where the gas is supplied to a main burner 4a.
A main valve, shown overall by 5, is disposed along the main duct 2. The valve comprises a valve seat 5a associated with a respective shutter 5b, for instance with membrane control 5c for the opening of the seat 5a in opposition 5 to a respective resilient recall means such as a respective spring 5d.
The valve 5 acts as an on/off valve for the safe closure of the main gas channel, as will be described in detail below.
The valve 5 may be associated with an electrovalve for controlling the servo-assisted circuit, shown by 7, disposed to open and close an auxiliary duct 8 for io driving the servo- circuit, which forms the take-up duct for the pressure signal to be transferred to the drive chamber of the servo-circuit. The membrane 5c acts directly on a control stem 5e of the shutter 5b which is in turn urged to close the seat by the spring 5d.
One side of the membrane 5c defines a drive chamber 10 which communicates with the main duct 2, upstream of the valve 5, via the duct 8.
More particularly, the duct 8 has a first portion 8a, extending upstream of the electrovalve 7, and a second portion 8b, prolonging the first, extending downstream of the electrovalve 7 and communicating with the chamber 10. A
throttle 30 is provided in the duct portion 8b.
The drive chamber 10 is connected to the main duct 2, downstream of the valve seat 5a of the valve 5, by a respective discharge duct 28 in which a pressure regulator, shown overall by 32, is provided. The regulator is a membrane pressure regulator, known per se, in which one side of the membrane defines a drive chamber 33 communicating, by means of a portion 28a of the duct 28, with the main duct 2 (downstream of the valve 5) and is also able to intercept the output section of the other portion 28b of the duct communicating with the drive chamber 10. The opposite side of the membrane is urged by a calibration spring 35 disposed in a chamber open to atmosphere via an opening 36. The pressure regulator 32 is designed to react to the supply pressure variations and to compensate them and return the pressure to a calibration value predetermined by regulation of the spring 35.
The pressure regulator 32 may also be designed with a pressure modulation function, for instance as a modulating regulator of electromagnetic type (by means of a motor, linear actuator) or of pneumatic (membrane) type.
io At the location of the electrovalve 7, the relative portion of the duct 8 may be opened and closed at will by an electromagnet 11, of on/off type with resilient recall, acting on a shutter member 12 associated with the throughput section of the duct 8 which may be displaced to and from a position intercepting the throughput section.
The valve unit of the device of the invention comprises an auxiliary gas line, branching from the main line, via which a pilot burner 16 is supplied. The auxiliary line has a pilot duct 16a which branches from the main duct 2 in order to supply the pilot burner 16.
Starting from the inlet section, in the main duct: 2, there is a first section 18' prolonged by a second section 18" via an interposed valve seat 18, on which a magnetic thermoelectric safety unit with manual arming 20 (or, as an alternative, with an automatic arming system) acts, this unit including a shutter 18a which is held in the position opening the seat 18 by the excitation of the magnetic unit generated by the voltage of a thermocouple (not shown) when there is a flame at the pilot burner 16.
The section 18" communicates with the main duct 2, downstream of the seat 18, and with the drive duct 8.
The section 18", extending downstream of the seat 18, is also connected with the pilot duct 16a via an interposed valve seat 20a.
A shutter 20b rigid with the control stem 20c of a knob member 20d of the magnetic unit acts on the valve seat 20a.
The drawing shows a top view of the knob 20d illustrating the operating positions which may be selected (OFF, PILOT, ON).
The knob member 20d is connected to the actuator stem 20c to carry out the io manual arming of the safety unit, in a manner known per se, in which, in the arming position (PILOT), the ignition of an ignition member (not shown, for instance of piezoelectric type) associated with the pilot burner 16, is simultaneously controlled. The knob 20d may also be switched to the closed position (OFF) in which the valve seats 18 and 20a are intercepted by the corresponding shutters of the magnetic safety unit.
A pressure regulator 40, with membrane control, designed to regulate the pressure of the gas and therefore the flow supplied to the pilot burner 16 operates in the pilot duct 16a.
The pressure regulator 40 includes a servovalve forming a valve seat 40a cooperating with a shutter shown diagrammatically at 40b, whose control stem 40c is rigidly connected to a control membrane 41 for its control. The membrane 41 is subject on one hand to the pressure regulated by the regulator device and on the other hand to a pressure established in a calibration chamber 42 of the regulator and to the resilient force of a spring 43.
According to the invention, a connection duct 45 is provided and brings the calibration chamber 42 into fluid communication with a section of the main duct 2 downstream of the valve 5, i.e. in a valve portion subject to a gas pressure when the shutters 12 and 5 are in the open position.
As an alternative, it is possible for the connection duct 45 to bring the chamber 42 into fluid communication with a section of the portion 8b of the duct 8 disposed downstream of the electrovalve 7.
The pressure signal downstream of the valve 5 (or in the above-mentioned alternative version, in the section 8b of the drive duct), is supplied to the calibration chamber 42 via the duct 45.
to It is possible, as a result of the provision of the connection duct 45, to obtain two separate pressure (and therefore flow) levels in the gas supplied via the pilot duct.
A first pressure level is generated in the pilot duct when the valve 5 is in the closed condition (with the valve 7 closed).
is At this stage, as no gas is passing through the electrovalve 7, no pressure correlated with the supply pressure is determined in the main duct downstream of the valve 5 (or, in the above-mentioned alternative version, in the portion 8b of the duct 8) and the regulator therefore determines a pressure correlated solely with the resilient force of the spring 43 which causes a first level of 20 supply flow to the pilot burner to maintain the pilot flame (the main burner is not activated).
The subsequent opening of the valve seat 5, by excitation of the electrovalve 7, causes, in the main duct downstream of the valve 5 (or, in the above-mentioned alternative version, in the portion 8b of the duct 8), a pressure 25 signal equal to or correlated with the supply pressure in the main duct, which signal, transferred by means of the duct 45 to the calibration chamber 42, determines a second pressure level regulated by the regulator, greater than the first level, and such as to enable the ignition of the main burner to which the gas flow is supplied after opening of the main duct 2.
It is thus possible to obtain a so-called 'two-stage' pilot burner 16, with a first reduced flow level designed solely to maintain the pilot burner flame, and a second higher flow level designed to ignite the main burner.
Fig. 2 shows a second embodiment of the device of the invention, in which details similar to those of the previous embodiment bear the same reference io numerals.
In this embodiment, the control device is applied to a valve of thermostat type, of the so-called 'thermo-mechanical thermostat" type, in which the valve seat 5a obtained in the main duct 2 is associated with a corresponding shutter 5b controlled by a thermo-mechanical actuator 50. A valve unit of this type is disclosed in Italian Patent Application PD2000A000138, in the name of the Applicants, whose specification is understood to be fully included here for any detail which is not described in detail below.
The above-mentioned actuator comprises a member 51 sensitive to water temperature variations which is disposed in contact with the water to be heated and is connected in operation to the shutter 5b of the valve. As a result of the thermal expansion of this member, a displacement correlated with the variation of the water temperature is generated, by a bi-stable elastic device 52, with respect to the control stem 5c of the shutter, as a result of which the shutter is caused to close the corresponding valve seat to intercept the flow of gas when a predetermined temperature value is exceeded.
The section 18", extending downstream of the seat 18, is also connected with the pilot duct 16a via an interposed valve seat 20a.
A shutter 20b rigid with the control stem 20c of a knob member 20d of the magnetic unit acts on the valve seat 20a.
The drawing shows a top view of the knob 20d illustrating the operating positions which may be selected (OFF, PILOT, ON).
The knob member 20d is connected to the actuator stem 20c to carry out the io manual arming of the safety unit, in a manner known per se, in which, in the arming position (PILOT), the ignition of an ignition member (not shown, for instance of piezoelectric type) associated with the pilot burner 16, is simultaneously controlled. The knob 20d may also be switched to the closed position (OFF) in which the valve seats 18 and 20a are intercepted by the corresponding shutters of the magnetic safety unit.
A pressure regulator 40, with membrane control, designed to regulate the pressure of the gas and therefore the flow supplied to the pilot burner 16 operates in the pilot duct 16a.
The pressure regulator 40 includes a servovalve forming a valve seat 40a cooperating with a shutter shown diagrammatically at 40b, whose control stem 40c is rigidly connected to a control membrane 41 for its control. The membrane 41 is subject on one hand to the pressure regulated by the regulator device and on the other hand to a pressure established in a calibration chamber 42 of the regulator and to the resilient force of a spring 43.
According to the invention, a connection duct 45 is provided and brings the calibration chamber 42 into fluid communication with a section of the main duct 2 downstream of the valve 5, i.e. in a valve portion subject to a gas pressure when the shutters 12 and 5 are in the open position.
As an alternative, it is possible for the connection duct 45 to bring the chamber 42 into fluid communication with a section of the portion 8b of the duct 8 disposed downstream of the electrovalve 7.
The pressure signal downstream of the valve 5 (or in the above-mentioned alternative version, in the section 8b of the drive duct), is supplied to the calibration chamber 42 via the duct 45.
to It is possible, as a result of the provision of the connection duct 45, to obtain two separate pressure (and therefore flow) levels in the gas supplied via the pilot duct.
A first pressure level is generated in the pilot duct when the valve 5 is in the closed condition (with the valve 7 closed).
is At this stage, as no gas is passing through the electrovalve 7, no pressure correlated with the supply pressure is determined in the main duct downstream of the valve 5 (or, in the above-mentioned alternative version, in the portion 8b of the duct 8) and the regulator therefore determines a pressure correlated solely with the resilient force of the spring 43 which causes a first level of 20 supply flow to the pilot burner to maintain the pilot flame (the main burner is not activated).
The subsequent opening of the valve seat 5, by excitation of the electrovalve 7, causes, in the main duct downstream of the valve 5 (or, in the above-mentioned alternative version, in the portion 8b of the duct 8), a pressure 25 signal equal to or correlated with the supply pressure in the main duct, which signal, transferred by means of the duct 45 to the calibration chamber 42, determines a second pressure level regulated by the regulator, greater than the first level, and such as to enable the ignition of the main burner to which the gas flow is supplied after opening of the main duct 2.
It is thus possible to obtain a so-called 'two-stage' pilot burner 16, with a first reduced flow level designed solely to maintain the pilot burner flame, and a second higher flow level designed to ignite the main burner.
Fig. 2 shows a second embodiment of the device of the invention, in which details similar to those of the previous embodiment bear the same reference io numerals.
In this embodiment, the control device is applied to a valve of thermostat type, of the so-called 'thermo-mechanical thermostat" type, in which the valve seat 5a obtained in the main duct 2 is associated with a corresponding shutter 5b controlled by a thermo-mechanical actuator 50. A valve unit of this type is disclosed in Italian Patent Application PD2000A000138, in the name of the Applicants, whose specification is understood to be fully included here for any detail which is not described in detail below.
The above-mentioned actuator comprises a member 51 sensitive to water temperature variations which is disposed in contact with the water to be heated and is connected in operation to the shutter 5b of the valve. As a result of the thermal expansion of this member, a displacement correlated with the variation of the water temperature is generated, by a bi-stable elastic device 52, with respect to the control stem 5c of the shutter, as a result of which the shutter is caused to close the corresponding valve seat to intercept the flow of gas when a predetermined temperature value is exceeded.
In this embodiment, the device of the invention connects the calibration chamber 42, by means of the duct 45, with a section of the main duct 2 disposed downstream of the valve seat 5 with respect to the direction of the flow of gas, thus obtaining the two-stage pilot function described above.
Fig. 3 shows a third embodiment of the device of the invention, in which details similar to those of the previous embodiments bear the same reference numerals.
In this embodiment, the control device is applied to a valve unit in which a pair of main servo-valves 5, 6 are provided in cascade with one another and a io draught switch 55 of pneumatic type is disposed in the combustion fume discharge duct 56. A valve unit of this type is disclosed in Italian Patent Application PD2010A000385, in the name of the Applicants, whose specification is understood to be fully included here for any detail which is not described in detail below.
is Similarly to the previous embodiment, the device of the invention connects the calibration chamber 42, by means of the duct 45, with the section of the main duct 2 disposed downstream of the valve seat 6a of the servo-valve 6 with respect to the direction of the flow of gas, thus obtaining the two-stage pilot function described above.
20 Fig. 4 shows a fourth embodiment of the device of the invention, in which details similar to those of the previous embodiments bear the same reference numerals.
This embodiment differs from the preceding embodiment chiefly in that it includes a draught switch 55 with a motor-driven actuator 60, as shown 25 diagrammatically in the corresponding Figure. Similarly to the previous embodiment, the calibration chamber 42 of the regulator is connected, via the duct 45, with the section of the main duct 2 disposed downstream of the valve seat 6a of the servo-valve 6 with respect to the direction of the flow of gas, thus obtaining the two-stage pilot function described above.
s The invention thus achieves the above-mentioned objects and also achieves the advantages listed with respect to known solutions. It should in particular be noted that it is possible, as a result of the invention, substantially to reduce the energy introduced into the system by the pilot burner during the "rest" stage in which no gas passes through the main duct in the direction of the main burner.
Fig. 3 shows a third embodiment of the device of the invention, in which details similar to those of the previous embodiments bear the same reference numerals.
In this embodiment, the control device is applied to a valve unit in which a pair of main servo-valves 5, 6 are provided in cascade with one another and a io draught switch 55 of pneumatic type is disposed in the combustion fume discharge duct 56. A valve unit of this type is disclosed in Italian Patent Application PD2010A000385, in the name of the Applicants, whose specification is understood to be fully included here for any detail which is not described in detail below.
is Similarly to the previous embodiment, the device of the invention connects the calibration chamber 42, by means of the duct 45, with the section of the main duct 2 disposed downstream of the valve seat 6a of the servo-valve 6 with respect to the direction of the flow of gas, thus obtaining the two-stage pilot function described above.
20 Fig. 4 shows a fourth embodiment of the device of the invention, in which details similar to those of the previous embodiments bear the same reference numerals.
This embodiment differs from the preceding embodiment chiefly in that it includes a draught switch 55 with a motor-driven actuator 60, as shown 25 diagrammatically in the corresponding Figure. Similarly to the previous embodiment, the calibration chamber 42 of the regulator is connected, via the duct 45, with the section of the main duct 2 disposed downstream of the valve seat 6a of the servo-valve 6 with respect to the direction of the flow of gas, thus obtaining the two-stage pilot function described above.
s The invention thus achieves the above-mentioned objects and also achieves the advantages listed with respect to known solutions. It should in particular be noted that it is possible, as a result of the invention, substantially to reduce the energy introduced into the system by the pilot burner during the "rest" stage in which no gas passes through the main duct in the direction of the main burner.
Claims (4)
1. A device for controlling the supply of fuel gas to a burner, in particular of a water heater appliance, comprising:
- a main duct for supplying the gas between an inlet section and an outlet section, - this main duct being provided with at least one main valve including a respective valve seat associated with a corresponding shutter with a respective control for the opening of the seat in opposition to a respective resilient recall member, - a pilot duct for supplying a pilot burner leading from the main duct upstream of at least the one main valve, - the main duct being provided, upstream of at least the one main valve, with a magnetic thermoelectric safety unit with a manually armed switch or with an automatic arming system, which acts on the pilot duct to enable the gas to flow to the pilot burner when the unit is armed, - the pilot duct being provided with a pressure regulator having a shutter with a membrane control, the membrane being subject on one hand to the pressure regulated by the regulator and on the other hand to a calibration pressure determined in a calibration chamber of the regulator, a calibration spring being provided in the chamber and acting on the membrane, characterized in that it comprises:
- fluid communication means between the calibration chamber of the pressure regulator and at least the one main valve, in order to supply to this calibration chamber a pressure signal correlated with the gas supply pressure when supplied to the main duct such that the pressure regulated by the regulator can be regulated at least to a first level, when there is no gas supply in the main duct, and to a second level, greater than the first level, when gas is being supplied in the main duct, the flow of gas supplied to the pilot duct being correlated with the respective levels of the pressure signal supplied to the calibration chamber.
- a main duct for supplying the gas between an inlet section and an outlet section, - this main duct being provided with at least one main valve including a respective valve seat associated with a corresponding shutter with a respective control for the opening of the seat in opposition to a respective resilient recall member, - a pilot duct for supplying a pilot burner leading from the main duct upstream of at least the one main valve, - the main duct being provided, upstream of at least the one main valve, with a magnetic thermoelectric safety unit with a manually armed switch or with an automatic arming system, which acts on the pilot duct to enable the gas to flow to the pilot burner when the unit is armed, - the pilot duct being provided with a pressure regulator having a shutter with a membrane control, the membrane being subject on one hand to the pressure regulated by the regulator and on the other hand to a calibration pressure determined in a calibration chamber of the regulator, a calibration spring being provided in the chamber and acting on the membrane, characterized in that it comprises:
- fluid communication means between the calibration chamber of the pressure regulator and at least the one main valve, in order to supply to this calibration chamber a pressure signal correlated with the gas supply pressure when supplied to the main duct such that the pressure regulated by the regulator can be regulated at least to a first level, when there is no gas supply in the main duct, and to a second level, greater than the first level, when gas is being supplied in the main duct, the flow of gas supplied to the pilot duct being correlated with the respective levels of the pressure signal supplied to the calibration chamber.
2. A device according to claim 1, wherein the fluid communication means comprise a connection duct extending between the calibration chamber and a section of the main supply duct downstream of the valve seat of at least the one main valve with respect to the direction of flow of the gas, the pressure signal supplied to the calibration chamber corresponding to the gas supply pressure obtained through the main valve.
3. A device according to claim 1, wherein at least the one main valve comprises a respective control electrovalve with a mechanical or electric operator to control the opening/closing of the main valve, the electrovalve being designed to act to open/close a drive duct of a respective servo-assisted drive circuit so as indirectly to control, by means of the membrane control, the respective shutter of the corresponding valve, the respective duct of the drive circuit bringing the main duct into fluid communication with a respective drive chamber of the main valve, one side of the membrane of the membrane control being subject to the pressure in the respective drive chamber, the fluid communication means comprising a duct connecting the calibration chamber of the pressure regulator and a section of the drive duct of the valve, this section being disposed between the electrovalve and the drive chamber.
4. A device according to claim 2 or 3, wherein the pressure signal supplied to the calibration chamber of the regulator, by means of the connection duct, is correlated with a regulated gas supply pressure supplied to the burner when the main valve is in the open position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPD2010A000393A IT1403356B1 (en) | 2010-12-27 | 2010-12-27 | DEVICE FOR CONTROLLING THE DISTRIBUTION OF A FUEL GAS TOWARDS A BURNER, PARTICULARLY FOR WATER HEATERS |
| ITPD2010A000393 | 2010-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2762742A1 true CA2762742A1 (en) | 2012-06-27 |
Family
ID=43737202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2762742A Abandoned CA2762742A1 (en) | 2010-12-27 | 2011-12-14 | A device for controlling the supply of fuel gas to a burner, in particular for water heater appliances |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20120160186A1 (en) |
| AU (1) | AU2011254070A1 (en) |
| CA (1) | CA2762742A1 (en) |
| IT (1) | IT1403356B1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8498523B2 (en) * | 2009-02-03 | 2013-07-30 | Intellihot, Inc. | Apparatus and control method for a hybrid tankless water heater |
| US10073071B2 (en) | 2010-06-07 | 2018-09-11 | David Deng | Heating system |
| US9739389B2 (en) | 2011-04-08 | 2017-08-22 | David Deng | Heating system |
| US10222057B2 (en) | 2011-04-08 | 2019-03-05 | David Deng | Dual fuel heater with selector valve |
| US9200802B2 (en) | 2011-04-08 | 2015-12-01 | David Deng | Dual fuel heater with selector valve |
| CN103732231B (en) | 2011-06-24 | 2020-04-10 | 格里生物公司 | Prevention and treatment of inflammatory disorders |
| CN102506198B (en) | 2011-10-20 | 2013-05-22 | 南京普鲁卡姆电器有限公司 | Dual-gas-source gas self-adaptive main control valve |
| US9175848B2 (en) * | 2011-12-05 | 2015-11-03 | David Deng | Dual fuel heater with selector valve |
| US20170082321A1 (en) * | 2012-02-28 | 2017-03-23 | Mertik Maxitrol Gmbh & Co., Kg | Flow control for a continuous-flow water heater |
| US9472744B2 (en) * | 2012-10-04 | 2016-10-18 | Marlow Industries, Inc. | System for thermoelectric energy generation |
| DE102014101758A1 (en) * | 2014-02-12 | 2015-08-13 | Ebm-Papst Landshut Gmbh | Gas valve with integrated air pressure switch |
| US9618205B2 (en) | 2014-05-13 | 2017-04-11 | Emerson Electric Co. | Gas flow controller for use in gas fired apparatus |
| US9945583B2 (en) | 2015-05-29 | 2018-04-17 | Emerson Electric Co. | Gas flow controller including valve decoupling mechanism |
| US10012384B2 (en) | 2015-10-10 | 2018-07-03 | Emerson Electric Co. | Gas flow controller including over-pressure protection features |
| CN106884995B (en) * | 2015-10-12 | 2022-01-21 | 艾默生过程管理调节技术公司 | Adjustable combustor control valve |
| CN106091104B (en) * | 2016-07-01 | 2018-12-18 | 徐州新风空调设备有限公司 | A kind of heating system |
| EP3589894B1 (en) | 2017-12-11 | 2021-04-14 | Sit S.P.A. | Valve delivery apparatus |
| CN110207114B (en) * | 2018-09-30 | 2021-06-08 | 华帝股份有限公司 | Combustor capable of detecting air chamber pressure and control method thereof |
| TWI745063B (en) * | 2020-08-31 | 2021-11-01 | 七宇實業股份有限公司 | Gas safety device that controls large flow with low power |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1201482A (en) * | 1967-04-20 | 1970-08-05 | British Thermostat Co Ltd | Control for gas burners |
| US3999932A (en) * | 1975-11-10 | 1976-12-28 | Johnson Controls, Inc. | Valve assembly having leak detection apparatus |
| IT1315698B1 (en) * | 2000-05-22 | 2003-03-18 | Sit La Precisa Spa | VALVE GROUP FOR THE CONTROL OF THE DELIVERY OF A GAS FUEL, PARTICULARLY FOR HEATING DEVICES |
| US20060207654A1 (en) * | 2005-03-18 | 2006-09-21 | Chun-Cheng Huang | Proportional pressure adjusting valve with two main valves and two diaphragms |
| WO2007060696A1 (en) * | 2005-11-23 | 2007-05-31 | Sit La Precisa S.P.A. | Device for controlling the delivery of a combustible gas to a burner apparatus |
| US7523762B2 (en) * | 2006-03-22 | 2009-04-28 | Honeywell International Inc. | Modulating gas valves and systems |
-
2010
- 2010-12-27 IT ITPD2010A000393A patent/IT1403356B1/en active
-
2011
- 2011-12-14 US US13/326,100 patent/US20120160186A1/en not_active Abandoned
- 2011-12-14 CA CA2762742A patent/CA2762742A1/en not_active Abandoned
- 2011-12-15 AU AU2011254070A patent/AU2011254070A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| IT1403356B1 (en) | 2013-10-17 |
| ITPD20100393A1 (en) | 2012-06-28 |
| AU2011254070A1 (en) | 2012-07-12 |
| US20120160186A1 (en) | 2012-06-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20161214 |