US20200056783A1 - Valvular control circuit - Google Patents
Valvular control circuit Download PDFInfo
- Publication number
- US20200056783A1 US20200056783A1 US16/608,170 US201716608170A US2020056783A1 US 20200056783 A1 US20200056783 A1 US 20200056783A1 US 201716608170 A US201716608170 A US 201716608170A US 2020056783 A1 US2020056783 A1 US 2020056783A1
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- United States
- Prior art keywords
- thermoelectric power
- coupled
- command
- valve
- valve element
- Prior art date
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- Abandoned
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- 238000012806 monitoring device Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000011664 signaling Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/725—Protection against flame failure by using flame detection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
-
- 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
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/105—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
-
- F23N2027/22—
-
- F23N2029/02—
-
- F23N2031/08—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/22—Pilot burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/02—Pilot flame sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/06—Fail safe for flame failures
- F23N2231/08—Fail safe for flame failures for pilot flame failures
Definitions
- the present invention concerns a valvular control circuit associable with an apparatus powered by gas, such as for example natural gas, methane, propane or other gases, or mixtures of air and gas.
- gas such as for example natural gas, methane, propane or other gases, or mixtures of air and gas.
- the apparatuses in question comprise boilers, storage water-heaters, stoves, furnaces, fireplaces or other similar or comparable apparatuses.
- Valvular control circuits are known, able to control and regulate gas-powered apparatuses in which there are one or more safety and/or regulation valves that, depending on the regulation set on each occasion by the user, power the main burner of the apparatus.
- thermoelectric power source that, cooperating with an auxiliary heat source, generally called pilot light, makes the valvular control circuits self-powered.
- the pilot light is generated by a manual drive that is maintained functioning by the user until the thermoelectric power source generates a stable electric power voltage sufficient to power both the control electronics and also the safety and/or regulation valves.
- thermoelectric power source typically generates a limited electric voltage that has to be amplified in order to power the control electronics and at the same time to supply the necessary power to drive the safety and/or regulation valves.
- thermoelectric power source due to the slow time constant of the thermoelectric power source and the drops in voltage at the heads of the safety and/or regulation valves, during start-up the user has to keep the manual drive activated for rather a long time.
- thermoelectric power source If the apparatus is a storage water-heater, it is fundamental to guarantee a continuous functioning and, in this context, the element most at risk is the thermoelectric power source.
- thermoelectric power source since it is heated to temperatures in the range of 600° C.-750° C., the thermoelectric power source is very sensitive to oxidation, which leads to progressive wear and eventually breakage.
- thermoelectric power source The variability of the pilot light caused for example by drafts, composition and pressure of the power gases, drops of condensation etc., makes it difficult to assess the state of wear of the thermoelectric power source.
- thermoelectric power source approaches breakage point, it is subjected to a deterioration that is not distinguishable from the variations due to its normal functioning.
- the purpose of the present invention is to provide a valvular control circuit associated with a gas-powered apparatus that allows to power quickly both the control electronics and also the safety and/or regulation valves at every start-up, or following temporary malfunctions.
- Another purpose is to provide a valvular control circuit that also allows to program the maintenance operations and/or replacements of parts of the valvular control circuit and/or the apparatus associated therewith.
- Another purpose of the present invention is to provide a valvular control circuit able to monitor the power condition thereof, and that at the same time allows to promptly verify whether any dangerous tampering has occurred.
- the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- embodiments of the present invention concern a valvular control circuit comprising a first valve element coupled with a first valve switch, a second valve element coupled with a second valve switch, a control and command unit coupled with a DC/DC electric voltage converter and able to command the first valve switch and the second valve switch by means of a command signal, said first valve element being coupled to a manual drive member to generate a pilot light.
- the present invention concerns a valvular control circuit comprising a first valve element coupled with a manual drive member to generate a pilot light, a second valve element coupled with a second valve switch, and a control and command unit coupled with a DC/DC electric voltage converter and able to command the second valve switch by means of a command signal.
- the valvular control circuit comprises a first thermoelectric power source coupled with the DC/DC electric voltage converter, and a second thermoelectric power source coupled with at least one of either the first valve element or the second valve element, the thermoelectric power sources both being fed by the pilot light.
- the first thermoelectric power source is coupled with the DC/DC electric voltage converter and the second valve element, and the second thermoelectric power source is coupled with the first valve element.
- the second thermoelectric power source is coupled with the first valve element and with the second valve element.
- the second thermoelectric power source comprises a thermocouple.
- the pilot light affects both the thermoelectric power sources to an equal extent, said thermoelectric power sources being disposed at a substantially equal distance from the pilot light.
- thermoelectric power sources are disposed in a single protective container so as to be subjected to the same heating conditions.
- the valvular control circuit comprises a rechargeable energy source removably coupled with the DC/DC electric voltage converter and with the control and command unit.
- thermoelectric power sources comprises a thermopile.
- thermoelectric power sources are identical to each other.
- the first and second thermoelectric power sources have, with respect to each other, one or more different characteristics chosen from the time constant, electric resistance and electromotive force which can be generated.
- control and command unit has at least a monitoring device able to monitor the electromotive force generated by one or both of the thermoelectric power sources and to signal their functioning state and/or wear in relation to the electromotive forces measured.
- the control and command unit has, or is connected to, a sensor able to detect the electric voltage of one or both of the thermoelectric power sources and, if the electric power voltage detected is greater than a threshold value of electric voltage, or the difference of electric voltage between the thermoelectric power sources is comprised in a predetermined voltage range, said sensor is configured to send an alarm signal.
- FIGS. 1-5 schematically show possible embodiments of a valvular control circuit described in the present disclosure.
- Embodiments described here with reference to the drawings concern a valvular control circuit 10 configured to control the functioning of a gas-powered user apparatus.
- the gas-powered user apparatuses in question comprise boilers, storage water-heaters, stoves, furnaces, fireplaces or other similar or comparable apparatuses in which there is a main burner 11 powered by natural gas, methane, propane or other gases, or mixtures of air/gas.
- the main burner 11 is configured to heat the load 31 , that is, the water, to a desired temperature.
- the valvular control circuit 10 comprises a first valve 12 and a second valve 14 coupled with a second valve switch 15 .
- the first valve 12 can be coupled with a first valve switch 13 .
- valve here means any valve element, driven mechanically, electromechanically or electrically, comprising one or more valves associated with each other to form a functional component.
- the first valve 12 and the second valve 14 can each comprise, for example, an electrovalve that switches its state from closed to open and vice versa, when an electric command signal is sent respectively to the first valve switch 13 or the second valve switch 15 .
- the first valve 12 is opened manually and this operation can be performed by driving a manual drive member 20 .
- the first valve 12 can be closed electronically, if it is associated with the first valve switch 13 , or manually in the absence of the first valve switch 13 .
- the first valve 12 functions as an entrance safety valve which, when it is open, allows the gas to transit from the gas feed source to the user apparatus.
- the second valve 14 functions as a valve to regulate the feed gas to the main burner 11 .
- the second valve 14 can function as a supplementary safety valve. When the second valve 14 is closed, the first valve 12 can feed only the pilot light 21 through the pilot path.
- the first valve 12 and/or the second valve 14 can each be coupled with a pressure regulator to define on each occasion the delivery pressure of the gas exiting from the corresponding valve.
- the valvular control circuit 10 comprises a command and control unit 16 coupled with a DC/DC electric voltage converter 17 .
- the command and control unit 16 is able to command the first valve switch 13 and/or the second valve switch 15 by means of a command signal sent to them.
- the DC/DC electric voltage converter 17 coupled with the command and control unit 16 is able to convert an entering DC electric voltage into an amplified DC electric voltage at exit, so as to power the command and control unit 16 with the necessary voltage.
- the command and control unit 16 when necessary, sends a command signal to the first valve switch 13 and/or the second valve switch 15 to switch the state of the corresponding valve 12 and/or 14 .
- the command and control unit 16 can comprise a programmable microprocessor, an electronic circuit, an electronic board or other similar or comparable electronic unit.
- the command and control unit 16 can comprise, or be connected to, a selection unit 18 configured to select the temperature to which the load 31 is to be taken, for example water if the user apparatus is a storage water-heater.
- the selection unit 18 can comprise a thermostat provided with knobs and/or a user interface by means of which the user can select the temperature.
- the command and control unit 16 can comprise, or be connected to, one or more temperature probes 19 located in the area where the temperature is to be regulated.
- the temperature probe 19 can be immersed inside the liquid to be heated.
- the cooperation between the selection unit 18 and the temperature probe 19 allows to continuously monitor and regulate the temperature of the load 31 according to the desired temperature.
- the first valve 12 is coupled with a manual drive member 20 to generate a pilot light 21 .
- the manual drive member 20 is configured to open the first valve 12 to allow the gas to transit along the pilot path and feed the pilot light 21 .
- the start-up or restart step is obtained while keeping the second valve 14 closed, so as not to feed the main burner 11 during the start-up step.
- the manual drive member 20 can be included in the selection unit 18 , or can be connected to it, or can be independent from it.
- the preselection of the temperature remains unchanged when the valvular control circuit 10 is switched on, off or on stand-by.
- the valvular control circuit 10 comprises a first thermoelectric power source 22 coupled with the DC/DC electric voltage converter 17 , and a second thermoelectric power source 23 coupled with at least one of either the first valve element 12 or the second valve element 14 , said thermoelectric power sources 22 , 23 both being fed by the pilot light 21 .
- the first thermoelectric power source 22 is coupled with the DC/DC electric voltage converter 17 and the second valve 14
- the second thermoelectric power source 23 is coupled with the first valve 12 .
- the second thermoelectric power source 23 comprises a thermocouple 26 .
- thermocouple 26 has very quick reaction times that can further reduce the time for which a user has to keep the manual drive member 20 in action.
- thermocouple 26 This high reactivity of the thermocouple 26 also allows to detect promptly any possible variations in the pilot light 21 , and hence to intervene immediately.
- thermoelectric power sources 22 and 23 One of the advantages that can be obtained according to the present invention concerns the possibility of effectively assessing the state of wear of each of the thermoelectric power sources 22 and 23 .
- thermoelectric power sources 22 and 23 By constantly monitoring both the thermoelectric power sources 22 and 23 , it is possible to assess the evolution over time of the parameters that characterize them.
- thermoelectric power sources 22 and 23 From one or more differences in the temporal evolution, for example of the electric resistances, the electric voltages at their heads, or the electric voltage on a load located between the two thermoelectric power sources 22 and 23 , it is possible to determine the functioning state and/or the state of wear of one or both the thermoelectric power sources 22 and 23 .
- thermoelectric power sources 22 and 23 This combined monitoring of both thermoelectric power sources 22 and 23 allows to foresee, in time, when and which source will need to be replaced.
- thermoelectric power sources 22 and 23 it is possible to define on each occasion, also with self-learning algorithms, a series of reference events in the evolution of the parameters monitored, with which specific states of the thermoelectric power sources 22 and 23 are associated.
- the pilot light 21 affects equally both the thermoelectric power sources 22 and 23 , since said thermoelectric power sources 22 and 23 are disposed at a substantially equal distance from the pilot light 21 .
- thermoelectric power sources 22 and 23 are disposed in a single protective container 24 , so as to be subjected to the same heating conditions.
- the protective container 24 also allows to protect the two thermoelectric power sources 22 and 23 against external agents that can change their functioning.
- thermoelectric power sources 22 and 23 are identical.
- thermoelectric power sources 22 and 23 obtains more advantageous solutions, since the working conditions of the two thermoelectric power sources 22 and 23 are always closer to each other.
- thermoelectric power sources 22 and 23 can have one or more reciprocally different characteristic parameters, chosen from a group comprising time constant, electric resistance and electromotive force that can be generated.
- the command and control unit 16 has or is connected to at least a monitoring device 25 able to monitor the electromotive force generated by one or both the thermoelectric power sources 22 , 23 and to signal to a user their state in relation to the electromotive forces measured by the monitoring device 25 , for example by means of a user interface or signaling LEDs or other signaling mean.
- the monitoring device 25 can be integrated in the command and control unit 16 , or can be connected to it.
- the measurement of the electromotive forces generated can be carried out by measuring devices connected to the heads of the thermoelectric power sources 22 and 23 .
- thermoelectric power sources 22 and 23 allow to obtain reliable information in rapid time, since the differential analysis of the trend of the electromotive forces is more precise than an analysis of the absolute values referred to a single thermoelectric power source.
- thermoelectric power source In fact, monitoring only the absolute values referred to a single thermoelectric power source, the latter would be confused with the characteristic fluctuations of the system.
- the ignition of the main burner 11 causes a corresponding temporary variation in the trend of the electromotive force generated by the two thermoelectric power sources 22 and 23 .
- the command and control unit 16 By suitably monitoring and combining the characteristics of the two thermoelectric power sources 22 and 23 , the command and control unit 16 , and in particular the monitoring device 25 , is able to quickly determine whether the pilot light 21 and/or the main burner 11 have been ignited successfully.
- thermoelectric power sources 22 and 23 Another advantage of having two separate and distinct thermoelectric power sources 22 and 23 is that this also makes the feed to the command and control unit 16 separate from the feed of one or both the valves 12 and 14 .
- thermoelectric power sources 22 and 23 This considerably reduces the start-up times compared with feeding from a single thermoelectric power source, since the load fed is divided between the two thermoelectric power sources 22 and 23 .
- thermoelectric power source especially during the start-up step, if there is only one thermoelectric power source, it is subjected to a very high load because the command and control unit 16 is also present, which is also designated to control the functioning of the valvular control circuit 10 .
- the operating continuity of the valvular control circuit 10 must be guaranteed.
- the command and control unit 16 switches both valve switches 13 and 15 .
- the first valve switch 13 when the first valve switch 13 intervenes, the first valve 12 is closed and consequently also the pilot path that feeds the pilot light 21 .
- thermoelectric power source 23 consists of a thermocouple 26 that powers the first valve 12
- first thermoelectric power source 22 consists of a thermopile 27 that powers both the second valve 14 and also the command and control unit 16 .
- first valve 12 is controlled by a manual drive member 20 .
- This solution solves the problem caused by the drops in voltage because the first valve 12 is not switched in response to the interruption in the power of the command and control unit 16 , and stays open even for very low power voltages, at which the command and control unit 16 would not be able to function.
- the command and control unit 16 and also possibly the main burner 11 can switch off, while the pilot light 21 stays ignited, since the first valve 12 does not change its state.
- a monitoring device 25 can be provided, able to compare the feed of the thermocouple 26 and the thermopile 27 to establish their degree of wear.
- thermoelectric power sources 22 and 23 are mechanical, while the command and control unit 16 is designated to perform a thermostat function, and to control and possibly signal the state of the two thermoelectric power sources 22 and 23 .
- thermoelectric power sources 22 and 23 comprises a thermopile 27 .
- the valvular control circuit 10 can comprise a rechargeable energy source 28 removably coupled with the DC/DC electric voltage converter 17 and the command and control unit 16 .
- the rechargeable energy source 28 allows to activate the command and control unit 16 in advance, before the time needed to activate the first thermoelectric power source 22 .
- pilot light 21 has been ignited can be signaled by means of signaling LEDs or other signaling means comprised in or connected to the command and control unit 16 .
- the rechargeable energy source 28 can comprise a rechargeable battery, which can be connected, when necessary, to power the command and control unit 16 .
- connection can be made automatically during the ignition of the pilot light 21 , or it can be selective and set on each occasion by a user.
- connection can be obtained by driving the manual drive member 20 , which in turn acts on a switch 32 put in series with the rechargeable energy source 28 .
- valvular control circuit 10 can also function without the rechargeable energy source 28 , since the latter can be disconnected or removed and the power supplied directly by the first thermoelectric power source 22 .
- thermoelectric power sources 22 and 23 are thermopile 27 , it is possible to use the excess energy possibly available at its heads to recharge the rechargeable energy source 28 .
- the command and control unit 16 can have, or be connected to, a sensor 29 able to detect the electric voltage of one or both of the thermoelectric power sources 22 and 23 and, if it is greater than a threshold value of electric voltage, the sensor 29 is configured to send an alarm signal 30 .
- the presence of the sensor 29 increases the overall safety level of the valvular control circuit 10 and of the user apparatus connected to it, since it allows to detect promptly whether a user connects an external power source, such as for example a battery, to the valves 12 and 14 and/or to the command and control unit 16 .
- an external power source such as for example a battery
- valves 12 and 14 must stay closed, to prevent the leakage of unburnt gases.
- the command and control unit 16 is configured to close the valves 12 and 14 and block the functioning of the user apparatus.
- the sensor 29 is also configured to measure the difference in the electric voltage between the heads of the two thermoelectric power sources 22 and 23 and, if it is comprised within a predetermined voltage range, the sensor 29 is configured to send an alarm signal 30 .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
- The present invention concerns a valvular control circuit associable with an apparatus powered by gas, such as for example natural gas, methane, propane or other gases, or mixtures of air and gas.
- By way of non-restrictive example, the apparatuses in question comprise boilers, storage water-heaters, stoves, furnaces, fireplaces or other similar or comparable apparatuses.
- Valvular control circuits are known, able to control and regulate gas-powered apparatuses in which there are one or more safety and/or regulation valves that, depending on the regulation set on each occasion by the user, power the main burner of the apparatus.
- Some valvular control circuits have a thermoelectric power source that, cooperating with an auxiliary heat source, generally called pilot light, makes the valvular control circuits self-powered.
- During start-up, the pilot light is generated by a manual drive that is maintained functioning by the user until the thermoelectric power source generates a stable electric power voltage sufficient to power both the control electronics and also the safety and/or regulation valves.
- The thermoelectric power source typically generates a limited electric voltage that has to be amplified in order to power the control electronics and at the same time to supply the necessary power to drive the safety and/or regulation valves.
- In this context, due to the slow time constant of the thermoelectric power source and the drops in voltage at the heads of the safety and/or regulation valves, during start-up the user has to keep the manual drive activated for rather a long time.
- If the apparatus is a storage water-heater, it is fundamental to guarantee a continuous functioning and, in this context, the element most at risk is the thermoelectric power source.
- Indeed, since it is heated to temperatures in the range of 600° C.-750° C., the thermoelectric power source is very sensitive to oxidation, which leads to progressive wear and eventually breakage.
- The variability of the pilot light caused for example by drafts, composition and pressure of the power gases, drops of condensation etc., makes it difficult to assess the state of wear of the thermoelectric power source.
- This assessment is made even more complicated since, as the thermoelectric power source approaches breakage point, it is subjected to a deterioration that is not distinguishable from the variations due to its normal functioning.
- Furthermore, from a safety point of view, it is necessary that the valvular control circuits cannot be tampered with by a user, or if this happens, the tampering must be detected so that the apparatus can be promptly blocked, so as to prevent accidents that can even be very serious.
- There is therefore a need to perfect and make available a valvular control circuit that overcomes at least one of the disadvantages of the state of the art.
- The purpose of the present invention is to provide a valvular control circuit associated with a gas-powered apparatus that allows to power quickly both the control electronics and also the safety and/or regulation valves at every start-up, or following temporary malfunctions.
- Another purpose is to provide a valvular control circuit that also allows to program the maintenance operations and/or replacements of parts of the valvular control circuit and/or the apparatus associated therewith.
- Another purpose of the present invention is to provide a valvular control circuit able to monitor the power condition thereof, and that at the same time allows to promptly verify whether any dangerous tampering has occurred.
- The Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- The present invention is set forth and characterized in the independent claim, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea.
- In accordance with the above purposes, embodiments of the present invention concern a valvular control circuit comprising a first valve element coupled with a first valve switch, a second valve element coupled with a second valve switch, a control and command unit coupled with a DC/DC electric voltage converter and able to command the first valve switch and the second valve switch by means of a command signal, said first valve element being coupled to a manual drive member to generate a pilot light.
- According to possible embodiments, the present invention concerns a valvular control circuit comprising a first valve element coupled with a manual drive member to generate a pilot light, a second valve element coupled with a second valve switch, and a control and command unit coupled with a DC/DC electric voltage converter and able to command the second valve switch by means of a command signal.
- In accordance with one aspect of the present invention, the valvular control circuit comprises a first thermoelectric power source coupled with the DC/DC electric voltage converter, and a second thermoelectric power source coupled with at least one of either the first valve element or the second valve element, the thermoelectric power sources both being fed by the pilot light.
- According to possible embodiments, the first thermoelectric power source is coupled with the DC/DC electric voltage converter and the second valve element, and the second thermoelectric power source is coupled with the first valve element.
- According to possible embodiments, the second thermoelectric power source is coupled with the first valve element and with the second valve element.
- According to a variant, the second thermoelectric power source comprises a thermocouple.
- According to a variant, the pilot light affects both the thermoelectric power sources to an equal extent, said thermoelectric power sources being disposed at a substantially equal distance from the pilot light.
- According to a possible variant, the first and the second thermoelectric power sources are disposed in a single protective container so as to be subjected to the same heating conditions.
- According to a possible variant, the valvular control circuit comprises a rechargeable energy source removably coupled with the DC/DC electric voltage converter and with the control and command unit.
- According to a variant, at least one of either the first or second thermoelectric power sources comprises a thermopile.
- According to a variant, the first and second thermoelectric power sources are identical to each other.
- According to a variant, the first and second thermoelectric power sources have, with respect to each other, one or more different characteristics chosen from the time constant, electric resistance and electromotive force which can be generated.
- According to a possible variant, the control and command unit has at least a monitoring device able to monitor the electromotive force generated by one or both of the thermoelectric power sources and to signal their functioning state and/or wear in relation to the electromotive forces measured.
- The control and command unit has, or is connected to, a sensor able to detect the electric voltage of one or both of the thermoelectric power sources and, if the electric power voltage detected is greater than a threshold value of electric voltage, or the difference of electric voltage between the thermoelectric power sources is comprised in a predetermined voltage range, said sensor is configured to send an alarm signal.
- These and other characteristics of the present invention will become apparent from the following description of some embodiments, given as a non-restrictive example with reference to the attached drawings wherein:
-
FIGS. 1-5 schematically show possible embodiments of a valvular control circuit described in the present disclosure. - To facilitate comprehension, the same reference numbers have been used, where possible, to identify identical common elements in the drawings. It is understood that elements and characteristics of one embodiment can conveniently be incorporated into other embodiments without further clarifications.
- Embodiments described here with reference to the drawings concern a
valvular control circuit 10 configured to control the functioning of a gas-powered user apparatus. - The gas-powered user apparatuses in question comprise boilers, storage water-heaters, stoves, furnaces, fireplaces or other similar or comparable apparatuses in which there is a
main burner 11 powered by natural gas, methane, propane or other gases, or mixtures of air/gas. - For example, if the gas-powered apparatus is a storage water-heater, the
main burner 11 is configured to heat theload 31, that is, the water, to a desired temperature. - According to possible embodiments, the
valvular control circuit 10 comprises afirst valve 12 and asecond valve 14 coupled with asecond valve switch 15. - According to possible embodiments, the
first valve 12 can be coupled with afirst valve switch 13. - It is understood that the word “valve” here means any valve element, driven mechanically, electromechanically or electrically, comprising one or more valves associated with each other to form a functional component.
- The
first valve 12 and thesecond valve 14 can each comprise, for example, an electrovalve that switches its state from closed to open and vice versa, when an electric command signal is sent respectively to thefirst valve switch 13 or thesecond valve switch 15. - During the start-up step, the
first valve 12 is opened manually and this operation can be performed by driving amanual drive member 20. - During the switching off step, the
first valve 12 can be closed electronically, if it is associated with thefirst valve switch 13, or manually in the absence of thefirst valve switch 13. - The
first valve 12 functions as an entrance safety valve which, when it is open, allows the gas to transit from the gas feed source to the user apparatus. - The
second valve 14 functions as a valve to regulate the feed gas to themain burner 11. - The
second valve 14 can function as a supplementary safety valve. When thesecond valve 14 is closed, thefirst valve 12 can feed only thepilot light 21 through the pilot path. - The
first valve 12 and/or thesecond valve 14 can each be coupled with a pressure regulator to define on each occasion the delivery pressure of the gas exiting from the corresponding valve. - The
valvular control circuit 10 comprises a command andcontrol unit 16 coupled with a DC/DCelectric voltage converter 17. - The command and
control unit 16 is able to command thefirst valve switch 13 and/or thesecond valve switch 15 by means of a command signal sent to them. - According to possible embodiments, the DC/DC
electric voltage converter 17 coupled with the command andcontrol unit 16 is able to convert an entering DC electric voltage into an amplified DC electric voltage at exit, so as to power the command andcontrol unit 16 with the necessary voltage. - According to possible embodiments, when necessary, the command and
control unit 16 sends a command signal to thefirst valve switch 13 and/or thesecond valve switch 15 to switch the state of thecorresponding valve 12 and/or 14. - The command and
control unit 16 can comprise a programmable microprocessor, an electronic circuit, an electronic board or other similar or comparable electronic unit. - The command and
control unit 16 can comprise, or be connected to, aselection unit 18 configured to select the temperature to which theload 31 is to be taken, for example water if the user apparatus is a storage water-heater. - For example, the
selection unit 18 can comprise a thermostat provided with knobs and/or a user interface by means of which the user can select the temperature. - The command and
control unit 16 can comprise, or be connected to, one ormore temperature probes 19 located in the area where the temperature is to be regulated. For example, thetemperature probe 19 can be immersed inside the liquid to be heated. - The cooperation between the
selection unit 18 and thetemperature probe 19 allows to continuously monitor and regulate the temperature of theload 31 according to the desired temperature. - According to possible embodiments, the
first valve 12 is coupled with amanual drive member 20 to generate apilot light 21. - In particular, at least during the first ignition or restarting step, the
manual drive member 20 is configured to open thefirst valve 12 to allow the gas to transit along the pilot path and feed thepilot light 21. - This can be carried out with the aid of a piezoelectric device, or other similar device.
- The start-up or restart step is obtained while keeping the
second valve 14 closed, so as not to feed themain burner 11 during the start-up step. - The
manual drive member 20 can be included in theselection unit 18, or can be connected to it, or can be independent from it. - If the
manual drive member 20 is separate from theselection unit 18, the preselection of the temperature remains unchanged when thevalvular control circuit 10 is switched on, off or on stand-by. - According to one aspect of the present invention, the
valvular control circuit 10 comprises a firstthermoelectric power source 22 coupled with the DC/DCelectric voltage converter 17, and a secondthermoelectric power source 23 coupled with at least one of either thefirst valve element 12 or thesecond valve element 14, saidthermoelectric power sources pilot light 21. - According to possible embodiments, the first
thermoelectric power source 22 is coupled with the DC/DCelectric voltage converter 17 and thesecond valve 14, and the secondthermoelectric power source 23 is coupled with thefirst valve 12. - According to a variant, the second
thermoelectric power source 23 comprises athermocouple 26. - The
thermocouple 26 has very quick reaction times that can further reduce the time for which a user has to keep themanual drive member 20 in action. - This high reactivity of the
thermocouple 26 also allows to detect promptly any possible variations in thepilot light 21, and hence to intervene immediately. - One of the advantages that can be obtained according to the present invention concerns the possibility of effectively assessing the state of wear of each of the
thermoelectric power sources - By constantly monitoring both the
thermoelectric power sources - In particular, from one or more differences in the temporal evolution, for example of the electric resistances, the electric voltages at their heads, or the electric voltage on a load located between the two
thermoelectric power sources thermoelectric power sources - This combined monitoring of both
thermoelectric power sources - In fact, it is possible to define on each occasion, also with self-learning algorithms, a series of reference events in the evolution of the parameters monitored, with which specific states of the
thermoelectric power sources - This not only allows to program the maintenance operations but also to monitor in detail the functioning of the
valvular control circuit 10 and of the user apparatus associated with it. - According to a variant, the
pilot light 21 affects equally both thethermoelectric power sources thermoelectric power sources pilot light 21. - According to a possible variant, the
thermoelectric power sources protective container 24, so as to be subjected to the same heating conditions. - The
protective container 24 also allows to protect the twothermoelectric power sources - According to a variant, the
thermoelectric power sources - The combination of one or more of the aspects described above obtains more advantageous solutions, since the working conditions of the two
thermoelectric power sources - According to a variant, the
thermoelectric power sources - According to a possible variant, the command and
control unit 16 has or is connected to at least amonitoring device 25 able to monitor the electromotive force generated by one or both thethermoelectric power sources monitoring device 25, for example by means of a user interface or signaling LEDs or other signaling mean. - The
monitoring device 25 can be integrated in the command andcontrol unit 16, or can be connected to it. - The measurement of the electromotive forces generated can be carried out by measuring devices connected to the heads of the
thermoelectric power sources - Using two
thermoelectric power sources - In fact, monitoring only the absolute values referred to a single thermoelectric power source, the latter would be confused with the characteristic fluctuations of the system.
- For example, when the
second valve 14 is opened, the ignition of themain burner 11 causes a corresponding temporary variation in the trend of the electromotive force generated by the twothermoelectric power sources - By suitably monitoring and combining the characteristics of the two
thermoelectric power sources control unit 16, and in particular themonitoring device 25, is able to quickly determine whether thepilot light 21 and/or themain burner 11 have been ignited successfully. - Another advantage of having two separate and distinct
thermoelectric power sources control unit 16 separate from the feed of one or both thevalves - This considerably reduces the start-up times compared with feeding from a single thermoelectric power source, since the load fed is divided between the two
thermoelectric power sources - This has the advantage that it does not require the user to prolong the action on the
manual drive member 20. - In fact, especially during the start-up step, if there is only one thermoelectric power source, it is subjected to a very high load because the command and
control unit 16 is also present, which is also designated to control the functioning of thevalvular control circuit 10. - Considering that the power voltage can diminish suddenly to very low values, for example due to drops of condensation falling onto the
thermoelectric power sources pilot light 21, the operating continuity of thevalvular control circuit 10 must be guaranteed. - With reference to
FIG. 2 , when thefirst valve 12 is driven purely mechanically, that is, by themanual drive member 20, even if the command andcontrol unit 16 normally stops functioning long before the threshold of mechanical release of thefirst valve 12, the latter is not affected by the drop in voltage of the command andcontrol unit 16. - In the event of a drop in voltage, with reference to
FIGS. 1, 3 and 5 , the command andcontrol unit 16 switches both valve switches 13 and 15. - In these embodiments, when the
first valve switch 13 intervenes, thefirst valve 12 is closed and consequently also the pilot path that feeds thepilot light 21. - This causes the
valvular control circuit 10 to switch off and requires manual rearming in order to start functioning again. - With reference to
FIG. 2 , this shows a solution in which the secondthermoelectric power source 23 consists of athermocouple 26 that powers thefirst valve 12, while the firstthermoelectric power source 22 consists of athermopile 27 that powers both thesecond valve 14 and also the command andcontrol unit 16. Furthermore, thefirst valve 12 is controlled by amanual drive member 20. - This solution solves the problem caused by the drops in voltage because the
first valve 12 is not switched in response to the interruption in the power of the command andcontrol unit 16, and stays open even for very low power voltages, at which the command andcontrol unit 16 would not be able to function. - In other words, following a sudden drop in the power voltage, the command and
control unit 16 and also possibly themain burner 11 can switch off, while thepilot light 21 stays ignited, since thefirst valve 12 does not change its state. - This has the advantage that, if the command and
control unit 16 stops functioning, even temporarily, thevalvular control circuit 10 self-restores thanks to the action of thepilot light 21, which is not affected by the interruption in the power. - In this solution too, a
monitoring device 25 can be provided, able to compare the feed of thethermocouple 26 and thethermopile 27 to establish their degree of wear. - In this way, all the safety functions are mechanical, while the command and
control unit 16 is designated to perform a thermostat function, and to control and possibly signal the state of the twothermoelectric power sources - According to a variant, at least one of the
thermoelectric power sources thermopile 27. - According to a possible variant, the
valvular control circuit 10 can comprise arechargeable energy source 28 removably coupled with the DC/DCelectric voltage converter 17 and the command andcontrol unit 16. - The
rechargeable energy source 28 allows to activate the command andcontrol unit 16 in advance, before the time needed to activate the firstthermoelectric power source 22. - This allows the command and
control unit 16 to signal quickly to the user that thepilot light 21 has been ignited. - In fact, without this strategy, the user has to keep the
manual drive member 20 active for a time longer than that generally necessary, because the user cannot know if thepilot light 21 is actually ignited and stable. - The fact that the
pilot light 21 has been ignited can be signaled by means of signaling LEDs or other signaling means comprised in or connected to the command andcontrol unit 16. - For example, the
rechargeable energy source 28 can comprise a rechargeable battery, which can be connected, when necessary, to power the command andcontrol unit 16. - The connection can be made automatically during the ignition of the
pilot light 21, or it can be selective and set on each occasion by a user. - For example, the connection can be obtained by driving the
manual drive member 20, which in turn acts on aswitch 32 put in series with therechargeable energy source 28. - It is quite clear that the
valvular control circuit 10 can also function without therechargeable energy source 28, since the latter can be disconnected or removed and the power supplied directly by the firstthermoelectric power source 22. - If one of the
thermoelectric power sources thermopile 27, it is possible to use the excess energy possibly available at its heads to recharge therechargeable energy source 28. - According to possible embodiments, the command and
control unit 16 can have, or be connected to, asensor 29 able to detect the electric voltage of one or both of thethermoelectric power sources sensor 29 is configured to send analarm signal 30. - The presence of the
sensor 29 increases the overall safety level of thevalvular control circuit 10 and of the user apparatus connected to it, since it allows to detect promptly whether a user connects an external power source, such as for example a battery, to thevalves control unit 16. - In fact, without the
pilot light 21, thevalves - An external power source could cause the
valves pilot light 21, with consequences for the user's safety. - Following the detection that the threshold conditions have been exceeded, the command and
control unit 16 is configured to close thevalves - The
sensor 29 is also configured to measure the difference in the electric voltage between the heads of the twothermoelectric power sources sensor 29 is configured to send analarm signal 30. - It is clear that modifications and/or additions of parts may be made to the
valvular control circuit 10 as described heretofore, without departing from the field and scope of the present invention. - It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of
valvular control circuit 10, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby. - In the following claims, the sole purpose of the references in brackets is to facilitate reading: they must not be considered as restrictive factors with regard to the field of protection claimed in the specific claims.
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2017-0052213 | 2017-04-24 | ||
KR20170052213 | 2017-04-24 | ||
PCT/EP2017/075379 WO2018197024A1 (en) | 2017-04-24 | 2017-10-05 | Valvular control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20200056783A1 true US20200056783A1 (en) | 2020-02-20 |
Family
ID=60162184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/608,170 Abandoned US20200056783A1 (en) | 2017-04-24 | 2017-10-05 | Valvular control circuit |
Country Status (3)
Country | Link |
---|---|
US (1) | US20200056783A1 (en) |
CA (1) | CA3061081A1 (en) |
WO (1) | WO2018197024A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210156594A1 (en) * | 2018-06-06 | 2021-05-27 | Sit S.P.A. | Safety system for a gas apparatus for heating water |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120276488A1 (en) * | 2011-04-29 | 2012-11-01 | Virag Tibor M | Flame deflector for a water heater pilot burner |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4984981A (en) * | 1989-06-02 | 1991-01-15 | A. O. Smith Corporation | Heater with flame powered logic supply circuit |
US20130104814A1 (en) * | 2011-10-28 | 2013-05-02 | Mark Reyman | Hot water heater with self-powered automatic pilot light |
US9494320B2 (en) * | 2013-01-11 | 2016-11-15 | Honeywell International Inc. | Method and system for starting an intermittent flame-powered pilot combustion system |
-
2017
- 2017-10-05 CA CA3061081A patent/CA3061081A1/en active Pending
- 2017-10-05 US US16/608,170 patent/US20200056783A1/en not_active Abandoned
- 2017-10-05 WO PCT/EP2017/075379 patent/WO2018197024A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120276488A1 (en) * | 2011-04-29 | 2012-11-01 | Virag Tibor M | Flame deflector for a water heater pilot burner |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210156594A1 (en) * | 2018-06-06 | 2021-05-27 | Sit S.P.A. | Safety system for a gas apparatus for heating water |
Also Published As
Publication number | Publication date |
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WO2018197024A1 (en) | 2018-11-01 |
CA3061081A1 (en) | 2018-11-01 |
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