EP3612768B1 - Burner comprising a detecting sensor for a flame and method of modification of a burner - Google Patents
Burner comprising a detecting sensor for a flame and method of modification of a burner Download PDFInfo
- Publication number
- EP3612768B1 EP3612768B1 EP18729499.6A EP18729499A EP3612768B1 EP 3612768 B1 EP3612768 B1 EP 3612768B1 EP 18729499 A EP18729499 A EP 18729499A EP 3612768 B1 EP3612768 B1 EP 3612768B1
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- EP
- European Patent Office
- Prior art keywords
- flame
- sensor
- control system
- burner
- voltage
- Prior art date
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- 238000000034 method Methods 0.000 title description 6
- 238000012986 modification Methods 0.000 title 1
- 230000004048 modification Effects 0.000 title 1
- 239000000446 fuel Substances 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000011426 transformation method Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air 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
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air 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
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements 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
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/085—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements 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
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements 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
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/04—Flame sensors sensitive to the colour of flames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/08—Flame sensors detecting flame flicker
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2900/00—Special features of, or arrangements for controlling combustion
- F23N2900/05004—Details of components, e.g. connecting adaptors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2900/00—Special features of, or arrangements for controlling combustion
- F23N2900/05005—Mounting arrangements for sensing, detecting or measuring devices
Definitions
- the present invention relates to a burner comprising a sensor for detecting a flame for a control system of the burner, and a method for transforming said burner with a sensor for detecting a flame of a photo-resistance type into a burner having a sensor for detecting a flame of a photo-transistor or photodiode type.
- the present invention is used in gas-fired or oil-fired burners or with other fuels not expressly indicated herein.
- a possible use of the burner according to the present invention is in the field of boilers for domestic heating or for industrial applications.
- the present invention relates to the field of flame detecting sensors for a control system of a burner in which the control system is preconfigured to receive in input at least:
- a common control system of combustion of a burner comprises:
- the comburent supply means preferably comprises a fan infeeding air.
- the comburent preferably comprises air, but might include any other type of comburent different to air.
- the task of the control unit is mainly that of guaranteeing a "non-toxic" combustion so as not to generate exhausted gases (mainly carbon monoxide) damaging to the health of individuals and also to generate a correct combustion as a function of the power required.
- the flame signal is measured (using the sensor) and compared with a predefined threshold value (using the control unit) so as to control the combustion.
- a first type is based on a photo-resistance as a sensitive element which constitutes a member that varies the resistivity thereof as a function of the quantity of light that strikes it.
- the object of the present invention is to realise a burner which obviates the above-mentioned drawbacks.
- An object of the present invention is to realise a burner with a sensor for detecting a flame which is able to generate output signals which adapt to the control systems originally configured to operate with the photoresistors.
- a burner 100 is schematically illustrated, applied to a boiler or an industrial application and connected to a control system.
- the burner 100 comprises:
- the flow rate of the fuel is regulated by a valve 104 interposed along the relative conduit and connected to the control system 103.
- the flow rate of the comburent is regulated by increasing/reducing the revolutions of a fan 105 or by regulating the opening of an access mouth of the air. Therefore the fan 105 or the opening of the mouth is connected to the control system 103.
- control system 103 has a housing 106 and an input for connecting a sensor 1 for detecting a flame 2, so that the sensor 1 is facing and arranged at the flame 2.
- the sensor 1 for detecting the flame 2 is configurable between a condition of disconnection from the control system 103 in which it is separated therefrom and a condition of connection in which it is inserted in a suitable housing 106 and is electrically connected to the electrical input of the control system 103 so as to send a flame signal 2a from the electric circuit of the sensor 1 to the control system 103.
- the control system 103 is configured so as to regulate the flow rate of fuel and/or comburent according to the levels of voltage and/or current received by and contained in said flame signal 2a.
- the aim of the present invention is to operate with already pre-configured control systems (for other types of sensor 1) so as to receive in input at least a preset first range of voltage and/or current corresponding to a status of absence or loss of the flame 2 and at least a second preset range of voltage and/or current, different to the first and corresponding to a status of presence of the flame 2.
- the sensor 1 according to the present invention is configured to detect various values so as also to evaluate the quality of the flame 2.
- a sensor 1 for detecting the flame 2 comprises a sensitive element 3 ( figures 4 and 5 ) of the flame 2 comprising a phototransistor or photodiode in use facing the flame 2 in order to receive an electromagnetic wave (preferably luminous) emitted by the flame 2.
- a type of phototransistor or photodiode is advantageously normally configured to select a particular wavelength of the light that is to be detected.
- the sensitive element 3 is configured to generate a detecting signal 4 having a voltage and/or current that is variable as a function of the electromagnetic wave emitted by the flame 2 and corresponding at least to a status of absence of the flame 2 or presence of the flame 2.
- the senor 1 comprises an interface electric circuit 6 ( figures 2 and 3 ) connected between the sensitive element 3 and an output 5 of the circuit configured for converting the detecting signal 4 generated by the sensitive element 3 into a flame signal 2a.
- the electric circuit 6 advantageously enables converting each value of the signal generated by the sensitive element 3 with a corresponding voltage/current level that the control system 103 is predisposed to receive.
- the flame signal 2a (generated downstream of the electric circuit 6) has a first voltage and/or current level that falls within the first preset range of voltage and/or current of the control system 103 when the electromagnetic wave emitted by the flame 2 corresponds to the status of absence or loss of the flame 2.
- the flame signal 2a has a second level of voltage and/or current that falls within the second preset range of voltage and/or current, when the electromagnetic wave emitted by the flame 2 corresponds to the status of presence of the flame 2.
- FIG 8 illustrates an example of this correspondence in which the item “voltage level (Vdc) [1]” corresponds to the values of the range that the control system 103 accepts in input to signal a determined status of the flame 2, while the item “voltage at the sensor heads 1 (Vdc) [3]” corresponds to the voltage levels that the sensor 1 generates for corresponding statuses of the flame 2.
- the electric circuit 6 comprises an amplification step 7 configured for amplifying the detecting signal 4 generated by the phototransistor or photodiode.
- these generate a detecting signal 4 having a very low bandwidth (micro-amperes or micro-volts) and it is therefore necessary to perform an amplification.
- a first type ( figure 2 ) in which the electric circuit 6 is of a digital type so as to adapt to a control system 103 of the burner 100 of electronic type.
- the amplification step 7 is preferably realised by means of a "mirror current" configuration which is followed in cascade by a protection step 8 (using a resistance) which lastly is followed by a stabilisation step 9 of the voltage (voltage control).
- a second type of circuit ( figure 3 ) is of analogue type so as to adapt to a control system 103 of the burner 100 of an electromechanical type.
- a current control is carried out.
- the flame signal 2a is generated in output 5 to the sensor 1 at respective clamps which are in use connected to the input of the control system 103 of the burner 100.
- the electric circuit 6 is supplied by a supply voltage or current applied to the output 5 of the circuit.
- a light of 1 nominal Lux corresponds to a voltage at the heads of the sensor 1 of about 3.49 Volts
- a light of 1.5 Lux corresponds to a voltage at the heads of the sensor 1 of about 3.13 Volts.
- the phototransistor or photodiode is preferably of a type that is selective of the wavelength and is configured to generate the detecting signal 4 when the electromagnetic wave has a value comprised between 0 and 3 nominal Lux, but it might be configured differently according to needs.
- the senor 1 has an elongated shape according to a direction going from the phototransistor or photodiode to the output 5 of the circuit, so as to be easily able to be inserted according to an insertion direction in a housing 106 of the control system 103 of the burner 100.
- two connecting clamps are present at the output 5 which are arranged, with respect to one another, staggered according to the extension direction of the sensor so as to optimise the volumes and with the aim of realising the connection of the clamps with the external cables for connecting to the control system 103 of the burner 100.
- the clamps are connected to respective electronic devices (J6 and J7) of the sensor 1 in which they are also staggered to one another in a similar way to the clamps.
- the senor 1 comprises an external casing 11 (preferably made of plastic) with the aim of protecting the circuit and the sensitive element 3.
- the housing 11 preferably has a longitudinal extension from an output hole 12 of the sensitive element 3, so that the sensitive element 3 projects out of the casing 11, to a connecting hole 13 from which the contacts of the output 5 of the sensor 1 project, so as to be able to connect them to the control system 103 of the burner 100.
- the casing 11 is advantageously realised in two semi-parts 14 hinged at the part from which the sensitive element 3 projects, and which are closed once the rest of the sensor 1 has been inserted.
- a complementarily-shaped seat to the sensor 1 is afforded internally of the semi-parts.
- the casing 11 has a broadening 15 at the part which is electrically connected to the control system 103 of the burner 100.
- housing 11 is advantageously complementarily shaped with respect to the housing already present on the control system 103.
- a further object of the present invention is a transformation method of the burner 100 described in the foregoing.
- the method comprises the step of inserting the sensor 1 internally of the housing and positioning it at the housing 106 of the control system 103 of the burner 100 so as to position the sensitive element at the flame 2, and so as to electrically connect the sensor 1 to the control system 103.
- the present invention attains the set objects.
- the present invention enables adapting the signals generated by the sensitive elements such as the phototransistor or photodiode to a common control system of a burner preconfigured to operate with photoresistors.
- the interface circuit enables matching the signals generated so as not to have to modify the whole control system and so as to be able to adapt thereto the sensor with a phototransistor or photodiode given equal wavelengths detected corresponding to the different statuses of the flame.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
Description
- The present invention relates to a burner comprising a sensor for detecting a flame for a control system of the burner, and a method for transforming said burner with a sensor for detecting a flame of a photo-resistance type into a burner having a sensor for detecting a flame of a photo-transistor or photodiode type.
- In particular the present invention is used in gas-fired or oil-fired burners or with other fuels not expressly indicated herein.
- Purely by way of example, a possible use of the burner according to the present invention is in the field of boilers for domestic heating or for industrial applications.
- In particular, the present invention relates to the field of flame detecting sensors for a control system of a burner in which the control system is preconfigured to receive in input at least:
- a preset first range of voltage and/or current corresponding to a status of absence or loss of the flame; and
- and at least a second preset range of voltage and/or current, different to the first and corresponding to a status of presence of the flame.
- In the prior art, a common control system of combustion of a burner comprises:
- an on-off and intercepting device (preferably a valve) which adjusts the fuel supply flow;
- supply means for supplying a comburent acting towards the burner for providing the comburent to the burner;
- a sensor for detecting a flame associated, in use, to the burner and positioned at the flame position;
- a control unit or control system operatively connected to the on-off and modulating device, to the supply means of the comburent and to the sensor for detecting the flame so as to control supply of fuel and comburent as a function of the detecting of the flame.
- The comburent supply means preferably comprises a fan infeeding air. In other words, the comburent preferably comprises air, but might include any other type of comburent different to air.
- In particular it should be noted that the task of the control unit is mainly that of guaranteeing a "non-toxic" combustion so as not to generate exhausted gases (mainly carbon monoxide) damaging to the health of individuals and also to generate a correct combustion as a function of the power required.
- Therefore, during the functioning of the burner the flame signal is measured (using the sensor) and compared with a predefined threshold value (using the control unit) so as to control the combustion.
- Some examples of known systems are disclosed in documents
US6060719 ,US3613062 ,DE2654881 ,US6013919 US6060719 discloses a related control system, which is however not preconfigured for receiving a signal characteristic of a photo-resistance, and does not disclose the interface electric circuit being configured for converting the detecting signal generated by the sensitive element (photodiode) into a flame signal characteristic of a photo-resistance flame sensor. - With reference to the sensor for detecting the flame, at present there exist different types on the market. For example a first type is based on a photo-resistance as a sensitive element which constitutes a member that varies the resistivity thereof as a function of the quantity of light that strikes it.
- However, the prior art has numerous drawbacks substantially linked to the fact that at present its production is being wound down as it has a large volume and dimensions, is difficult to build, it generates much waste during manufacturing and requires a careful selection which is carried out directly in the factory or during testing.
- Therefore a need is emerging to replace the photoresistors with other types of sensors that enable detection of the quality of the flame.
- However, different types of burners and control systems currently exists on the market and are also installed, calibrated on the basis of the voltage and/or current values generated by the photoresistors and which are not suited to functioning with other types of sensors.
- In this situation, the object of the present invention is to realise a burner which obviates the above-mentioned drawbacks.
- An object of the present invention is to realise a burner with a sensor for detecting a flame which is able to generate output signals which adapt to the control systems originally configured to operate with the photoresistors.
- The above-indicated objects are substantially attained by a burner with a sensor for detecting a flame and by a method for transforming said burner according to what is described in the appended claims.
- Further characteristics and advantages of the present invention will more greatly emerge from the detailed description of a preferred but not exclusive embodiment of a burner illustrated in the appended drawings, in which:
-
figure 1 illustrates a burner having a control system in which a detecting sensor according to the present invention has been inserted; -
figure 2 is a circuit diagram of a first type of sensor according to the present invention; -
figure 3 is a circuit diagram of a second type of sensor according to the present invention; -
figure 4 is a transparent lateral view of the first type of sensor; -
figure 5 is a transparent lateral view of the second type of sensor; -
figures 6 and 7 illustrate two steps of inclusion of the sensor according to the present invention, in a casing; and -
figure 8 illustrates a table of comparison of the values of the flame signal obtained with the sensor according to the present invention. - With reference to
figure 1 , aburner 100 is schematically illustrated, applied to a boiler or an industrial application and connected to a control system. - The
burner 100 comprises: - a
conduit 101 for supply of a fuel; - a
conduit 102 for supply of a comburent; - a
control system 103 operatively connected to theconduits - Note that the flow rate of the fuel is regulated by a
valve 104 interposed along the relative conduit and connected to thecontrol system 103. The flow rate of the comburent is regulated by increasing/reducing the revolutions of afan 105 or by regulating the opening of an access mouth of the air. Therefore thefan 105 or the opening of the mouth is connected to thecontrol system 103. - Further, the
control system 103 has ahousing 106 and an input for connecting asensor 1 for detecting aflame 2, so that thesensor 1 is facing and arranged at theflame 2. - Note that the
sensor 1 for detecting theflame 2 is configurable between a condition of disconnection from thecontrol system 103 in which it is separated therefrom and a condition of connection in which it is inserted in asuitable housing 106 and is electrically connected to the electrical input of thecontrol system 103 so as to send aflame signal 2a from the electric circuit of thesensor 1 to thecontrol system 103. Thecontrol system 103 is configured so as to regulate the flow rate of fuel and/or comburent according to the levels of voltage and/or current received by and contained in saidflame signal 2a. - As mentioned in the foregoing, the aim of the present invention is to operate with already pre-configured control systems (for other types of sensor 1) so as to receive in input at least a preset first range of voltage and/or current corresponding to a status of absence or loss of the
flame 2 and at least a second preset range of voltage and/or current, different to the first and corresponding to a status of presence of theflame 2. - Note that the
sensor 1 according to the present invention is configured to detect various values so as also to evaluate the quality of theflame 2. - According to the present invention, a
sensor 1 for detecting theflame 2 comprises a sensitive element 3 (figures 4 and 5 ) of theflame 2 comprising a phototransistor or photodiode in use facing theflame 2 in order to receive an electromagnetic wave (preferably luminous) emitted by theflame 2. - A type of phototransistor or photodiode is advantageously normally configured to select a particular wavelength of the light that is to be detected.
- Further, the
sensitive element 3 is configured to generate a detectingsignal 4 having a voltage and/or current that is variable as a function of the electromagnetic wave emitted by theflame 2 and corresponding at least to a status of absence of theflame 2 or presence of theflame 2. - Further, the
sensor 1 comprises an interface electric circuit 6 (figures 2 and 3 ) connected between thesensitive element 3 and anoutput 5 of the circuit configured for converting the detectingsignal 4 generated by thesensitive element 3 into aflame signal 2a. - The
electric circuit 6 advantageously enables converting each value of the signal generated by thesensitive element 3 with a corresponding voltage/current level that thecontrol system 103 is predisposed to receive. - The
flame signal 2a (generated downstream of the electric circuit 6) has a first voltage and/or current level that falls within the first preset range of voltage and/or current of thecontrol system 103 when the electromagnetic wave emitted by theflame 2 corresponds to the status of absence or loss of theflame 2. - Further, the
flame signal 2a has a second level of voltage and/or current that falls within the second preset range of voltage and/or current, when the electromagnetic wave emitted by theflame 2 corresponds to the status of presence of theflame 2. -
Figure 8 illustrates an example of this correspondence in which the item "voltage level (Vdc) [1]" corresponds to the values of the range that thecontrol system 103 accepts in input to signal a determined status of theflame 2, while the item "voltage at the sensor heads 1 (Vdc) [3]" corresponds to the voltage levels that thesensor 1 generates for corresponding statuses of theflame 2. - In order to carry out this adaptation or conversion of the signals, the
electric circuit 6 comprises anamplification step 7 configured for amplifying the detectingsignal 4 generated by the phototransistor or photodiode. In fact, these generate a detectingsignal 4 having a very low bandwidth (micro-amperes or micro-volts) and it is therefore necessary to perform an amplification. - In this regard, in the figures two types of electric circuit are represented. A first type (
figure 2 ) in which theelectric circuit 6 is of a digital type so as to adapt to acontrol system 103 of theburner 100 of electronic type. In this case theamplification step 7 is preferably realised by means of a "mirror current" configuration which is followed in cascade by a protection step 8 (using a resistance) which lastly is followed by astabilisation step 9 of the voltage (voltage control). - A second type of circuit (
figure 3 ) is of analogue type so as to adapt to acontrol system 103 of theburner 100 of an electromechanical type. In this case, a current control is carried out. There is preferably afirst amplification stage 7 which is followed by atranslation section 10 of the detectingsignal 4 comprising at least an inner transistor polarised by the electric current. - In both types of circuit, the
flame signal 2a is generated inoutput 5 to thesensor 1 at respective clamps which are in use connected to the input of thecontrol system 103 of theburner 100. - In any case, the
electric circuit 6 is supplied by a supply voltage or current applied to theoutput 5 of the circuit. - In the example of
figure 8 , it can be observed that a light of 1 nominal Lux corresponds to a voltage at the heads of thesensor 1 of about 3.49 Volts, while a light of 1.5 Lux corresponds to a voltage at the heads of thesensor 1 of about 3.13 Volts. - The phototransistor or photodiode is preferably of a type that is selective of the wavelength and is configured to generate the detecting
signal 4 when the electromagnetic wave has a value comprised between 0 and 3 nominal Lux, but it might be configured differently according to needs. - Further, the
sensor 1 has an elongated shape according to a direction going from the phototransistor or photodiode to theoutput 5 of the circuit, so as to be easily able to be inserted according to an insertion direction in ahousing 106 of thecontrol system 103 of theburner 100. - As can be seen in
figures 4 and 5 , two connecting clamps are present at theoutput 5 which are arranged, with respect to one another, staggered according to the extension direction of the sensor so as to optimise the volumes and with the aim of realising the connection of the clamps with the external cables for connecting to thecontrol system 103 of theburner 100. - On the internal side of the
sensor 1 the clamps are connected to respective electronic devices (J6 and J7) of thesensor 1 in which they are also staggered to one another in a similar way to the clamps. - In this way, it is advantageously possible to prevent inversion of the cables connected to the clamps (which define a coupling of the capacitive type) and facilitate the entire assembly in a restricted space.
- In
figures 6 and 7 it can be seen that thesensor 1 comprises an external casing 11 (preferably made of plastic) with the aim of protecting the circuit and thesensitive element 3. Thehousing 11 preferably has a longitudinal extension from anoutput hole 12 of thesensitive element 3, so that thesensitive element 3 projects out of thecasing 11, to a connectinghole 13 from which the contacts of theoutput 5 of thesensor 1 project, so as to be able to connect them to thecontrol system 103 of theburner 100. - The
casing 11 is advantageously realised in twosemi-parts 14 hinged at the part from which thesensitive element 3 projects, and which are closed once the rest of thesensor 1 has been inserted. A complementarily-shaped seat to thesensor 1 is afforded internally of the semi-parts. - The
casing 11 has a broadening 15 at the part which is electrically connected to thecontrol system 103 of theburner 100. - Note that the
housing 11 is advantageously complementarily shaped with respect to the housing already present on thecontrol system 103. - A further object of the present invention is a transformation method of the
burner 100 described in the foregoing. - In particular, the method follows directly from the above disclosure which is incorporated in its entirety in the following. The method comprises the following operative steps:
- selecting the
sensitive element 3 for detecting theflame 2 comprising a phototransistor or photodiode configured to receive an electromagnetic wave emitted by theflame 2 and to generate a detectingsignal 4 having voltage and/or current that is variable as a function of the electromagnetic wave emitted by theflame 2 and corresponding at least to a status of absence of theflame 2 or of presence of theflame 2; - making an interface
electric circuit 6 connected between thesensitive element 3 and anoutlet 5 of the circuit so as to generate aflame signal 2a inoutput 5 that has a first voltage and/or current level that falls within the first preset range of voltage and/or current of thecontrol system 103 when the electromagnetic wave emitted by theflame 2 corresponds to the status of absence or loss of theflame 2, and in such a way that saidflame signal 2a has a second level of voltage and/or current that falls within the second preset range of voltage and/or current, when the electromagnetic wave emitted by theflame 2 corresponds to the status of presence of theflame 2. - Further, the method comprises the step of inserting the
sensor 1 internally of the housing and positioning it at thehousing 106 of thecontrol system 103 of theburner 100 so as to position the sensitive element at theflame 2, and so as to electrically connect thesensor 1 to thecontrol system 103. - The present invention attains the set objects.
- In fact, the present invention enables adapting the signals generated by the sensitive elements such as the phototransistor or photodiode to a common control system of a burner preconfigured to operate with photoresistors.
- In particular, the interface circuit enables matching the signals generated so as not to have to modify the whole control system and so as to be able to adapt thereto the sensor with a phototransistor or photodiode given equal wavelengths detected corresponding to the different statuses of the flame.
Claims (10)
- A burner (100) for a boiler or industrial applications, comprising:- a conduit (101) for supply of the fuel;- a conduit (102) for supply of a comburent;- a control system (103) operatively connected to the conduits (101) (102) for supply of the fuel and the comburent for regulating a respective flow rate thereof; said control system (103) having a housing (106) for a sensor (1) for detecting a flame (2); said control system (103) being preconfigured for receiving in input at least a first range of voltage and/or current characteristic of a photo-resistance flame sensor and corresponding to a status of absence or loss of the flame (2) and at least a second range of voltage and/or current characteristic of a photo-resistance flame sensor and different from the first and corresponding to a status of presence of the flame (2);- a sensor (1) for detecting a flame (2) configurable between a condition of disconnection from the control system (103) and a condition of connection in which it is inserted in said housing (106) and electrically connected to the input of the control system (103) so as to send a flame signal (2a) from an interface electric circuit (6) to the control system (103); said control system (103) being configured so as to regulate the flow rate of fuel and/or comburent according to the levels of voltage and/or current received by said flame signal (2a);wherein said sensor (1) comprises:- a sensitive element (3) of the flame (2) comprising a phototransistor or photodiode in use facing the flame (2) to receive an electromagnetic wave emitted by the flame (2); said sensitive element (3) being configured for generating a detecting signal (4) having voltage and/or current that is variable as a function of the electromagnetic wave emitted by the flame (2) and corresponding at least to a status of absence of the flame (2) or of presence of the flame (2);- said interface electric circuit (6) being connected between the sensitive element (3) and an output (5) of the circuit configured for converting the detecting signal (4) generated by the sensitive element (3) into a flame signal (2a) characteristic of a photo-resistance flame sensor; said flame signal (2a) having a first voltage and/or current level that falls within the first range of voltage and/or current of the control system (103) characteristic of a photo-resistance flame sensor, when the electromagnetic wave emitted by the flame (2) corresponds to the status of absence or loss of the flame (2); said flame signal (2a) having a second level of voltage and/or current that falls within the second preset range of voltage and/or current of a photo-resistance flame sensor, when the electromagnetic wave emitted by the flame (2) corresponds to the status of presence of the flame (2).
- The burner (100) according to claim 1, characterised in that said electric circuit (6) comprises an initial amplification step (7) configured for amplifying the detecting signal (4) generated by the phototransistor or photodiode.
- The burner (100) according to any one of the preceding claims, characterised in that said electric circuit (6) is of analogue type so as to adapt to a control system (103) of the burner (100) of electromechanical type.
- The burner (100) according to claim 3, characterised in that said electric circuit (6) comprises an intermediate step of translating the detecting signal (4) comprising at least an inner transistor polarised by the electric current.
- The burner (100) according to any one of the preceding claims from 1 to 2, characterised in that said electric circuit (6) is of digital type so as to adapt to a control system (103) of the burner (100) of an electronic type.
- The burner (100) according to any one of the preceding claims, characterised in that said electric circuit (6) is supplied by a supply voltage or current applied to the output (5) of the circuit.
- The burner (100) according to any one of the preceding claims, characterised in that the phototransistor or photodiode is of a type that is selective of the wavelength and is configured for generating the detecting signal (4) when the electromagnetic wave has a value comprised between 0 and 5 nominal Lux.
- The burner (100) according to any one of the preceding claims, characterised in that the sensor (1) has an elongated shape from the phototransistor or photodiode to the output (5) of the circuit, according to an insertion direction in a housing (106) of the control system (103) of the burner (100).
- The burner (100) according to any one of the preceding claims, characterised in that the sensor (1) comprises an external casing (11).
- A transformation method of a burner (100) comprising a control system (103) having a housing (106) for a sensor (1) for detecting a flame (2), wherein said control system (103) is preconfigured for receiving in input at least a first range of voltage and/or current characteristic of a photo-resistance flame sensor and corresponding to a status of absence or loss of the flame (2) and at least a second range of voltage and/or current characteristic of a photo-resistance flame sensor and different from the first and corresponding to a status of presence of the flame (2);
characterised in that it comprises following operating steps:- disconnecting the sensor for detecting a flame (2) of a photo-resistance type from the housing (106) of the control system (103);- realising a sensor (1) for detecting a flame (2) by means of the following operating substeps:- selecting a sensitive element (3) for detecting the flame (2) comprising a phototransistor or photodiode configured for receiving an electromagnetic wave emitted by the flame (2) and for generating a detecting signal (4) having voltage and/or current that is variable as a function of the electromagnetic wave emitted by the flame (2) and corresponding at least to a status of absence of the flame (2) or of presence of the flame (2);- making an interface electric circuit (6) connected between the sensitive element (3) and an outlet (5) of the circuit so as to generate (5) a flame signal (2a) in output that has a first voltage and/or current level that falls within the first range of voltage and/or current of the control system (103) characteristic of a photo-resistance flame sensor, when the electromagnetic wave emitted by the flame (2) corresponds to the status of absence or loss of the flame (2), and such that said flame signal (2a) has a second level of voltage and/or current that falls within the second range of voltage and/or current characteristic of a photo-resistance flame sensor, when the electromagnetic wave emitted by the flame (2) corresponds to the status of presence of the flame (2);- inserting the sensor (1) for detecting a flame (2) realised in this way into the housing (106) of the control system (103).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000055306A IT201700055306A1 (en) | 2017-05-22 | 2017-05-22 | Flame detection sensor for a burner control system and method for making said sensor |
PCT/IB2018/053420 WO2018215887A1 (en) | 2017-05-22 | 2018-05-16 | Burner comprising a detecting sensor for a flame and method of modification of a burner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3612768A1 EP3612768A1 (en) | 2020-02-26 |
EP3612768B1 true EP3612768B1 (en) | 2021-03-10 |
Family
ID=59974798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18729499.6A Active EP3612768B1 (en) | 2017-05-22 | 2018-05-16 | Burner comprising a detecting sensor for a flame and method of modification of a burner |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3612768B1 (en) |
IT (1) | IT201700055306A1 (en) |
WO (1) | WO2018215887A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1214521A (en) * | 1968-02-22 | 1970-12-02 | Memco Electronics Ltd | Improvements relating to multi-burner furnaces |
CH606915A5 (en) * | 1976-10-22 | 1978-11-15 | Landis & Gyr Ag | |
US6060719A (en) * | 1997-06-24 | 2000-05-09 | Gas Research Institute | Fail safe gas furnace optical flame sensor using a transconductance amplifier and low photodiode current |
US6013919A (en) * | 1998-03-13 | 2000-01-11 | General Electric Company | Flame sensor with dynamic sensitivity adjustment |
-
2017
- 2017-05-22 IT IT102017000055306A patent/IT201700055306A1/en unknown
-
2018
- 2018-05-16 EP EP18729499.6A patent/EP3612768B1/en active Active
- 2018-05-16 WO PCT/IB2018/053420 patent/WO2018215887A1/en unknown
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
WO2018215887A1 (en) | 2018-11-29 |
EP3612768A1 (en) | 2020-02-26 |
IT201700055306A1 (en) | 2018-11-22 |
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