EP3325881B1 - Electro-pilotstatic valve for gas burners - Google Patents

Electro-pilotstatic valve for gas burners Download PDF

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Publication number
EP3325881B1
EP3325881B1 EP16757057.1A EP16757057A EP3325881B1 EP 3325881 B1 EP3325881 B1 EP 3325881B1 EP 16757057 A EP16757057 A EP 16757057A EP 3325881 B1 EP3325881 B1 EP 3325881B1
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EP
European Patent Office
Prior art keywords
electro
actuator
force
electromagnet
outlet channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16757057.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3325881A1 (en
Inventor
Rosalino Usci
Michele Marcantoni
Daniele BELMONTI
Roberto Onori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tre P Engineering Srl
Tre P Eng Srl
Original Assignee
Tre P Engineering Srl
Tre P Eng Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tre P Engineering Srl, Tre P Eng Srl filed Critical Tre P Engineering Srl
Publication of EP3325881A1 publication Critical patent/EP3325881A1/en
Application granted granted Critical
Publication of EP3325881B1 publication Critical patent/EP3325881B1/en
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Classifications

    • 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
    • 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
    • F23N5/107—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • the present invention relates to an electro-pilotstatic system for gas burners, in particular an electro-actuator for gas cooktops or the like equipped with a safety system.
  • the common cooktops are equipped with a safety system, advantageously comprising valves, which automatically stops the flow of the fuel gas to the burner in case of accidental switching off of the flame.
  • the user by interacting with the tap, performs a manual action that moves back the shutter of the safety valve, bringing a ferromagnetic keeper constrained thereto in contact with an electromagnet allowing the passage of gas for the ignition of the burner; said electromagnet being controlled and supplied by a flame detector.
  • Said flame detector generally makes use of a thermocouple placed in the proximity of the flame of the burner; in the presence of a flame said thermocouple generates a potential difference capable of producing an electric current that feeds the solenoid of said electromagnet.
  • the magnetic field created by the solenoid is sufficient to retain the shutter in its open position and to ensure the supply of the fuel gas to the burner.
  • thermocouple In the event that the flame accidentally goes out, the thermocouple does no longer produce any potential difference, as a consequence it ceases the electrical supply to the solenoid of the electromagnet, which is no longer able to generate a magnetic field sufficient to retain the shutter, which under the thrust of an elastic means, such as a spring, returns to the rest position closing the valve and thus interrupting the gas flow; this avoids that in case of inadvertent switching off of the flame the gas continues to be delivered by the valve, dispersing in the surrounding indoor environment (normally kitchens or rooms for the preparation and cooking of foods and meals) with serious risks for people and things.
  • the electromagnet - thermocouple coupling is known as "pilotstat" and is widely used on each burner to ensure a safe use of the cooktops.
  • Said division involves the installation of multiple components in cooktops or the like where the nature of the overall dimensions is extremely relevant and space saving is one of the objectives to be pursued for the designers and manufacturers.
  • shut-off valves exist on the market, which carry out the passage of gas through a remote electrical control.
  • shut-off valves are closed in the rest position, as a matter of safety, while in the working position they are constantly kept open through a continuous control signal.
  • This operating configuration involves a waste of energy and heating of the electrical and electronic equipment; the latter may generate over time a degradation of the insulator of the electric cables and a deterioration of the same circuit, leading to malfunctions or breakages.
  • EP1434965 B1 discloses a valve unit driven by an electro-actuator, the valve unit comprising the features of the preamble of claim 1.
  • the main object of the present invention is to provide an electro-actuator for gas cooktops or the like that combines in a single element both the part concerning safety and the part concerning the regulation of the flow.
  • the main object of the present invention is to provide an electro-actuator for gas cooktops or the like which integrates in a single element the regulation of the flow of the fuel gas and the automatic cut-off of the same in case of accidental switching off of the flame.
  • a further object of the present invention is to provide an electro-actuator for gas cooktops or the like which allows to feed the control and regulation devices of the gas flow only during the actuations of the same, by suspending the electrical supply once the regulation is complete.
  • any possible spatial reference such as the terms up/down, front/rear, right/left etc. refers to the position in which the elements are represented in the annexed figures.
  • the electro-actuator 1 for gas cooktops or the like is provided with a safety electromagnet 4, shut-off means 2 of the fuel gas, substantially a sleeve equipped with an outlet channel 22 and a fuel gas duct 23, at least one service shutter 20 and at least one safety shutter 20, cooperating with said shut-off means 2, whereon a pressing/pulling force acts that operates the safety closing of said electro-actuator 1, advantageously said pressing/pulling force being of magnetic or elastic nature.
  • Said service shutter and said safety shutter coincide in a same shutter 20 that performs two tasks simultaneously:
  • Said pressing/pulling force acts on said shutter 20 operating the safety closing of said electro-actuator 1, in particular said pressing force operates the safety closing of said outlet channel 22 of the fuel gas.
  • the electro-actuator 1 comprises a support structure 10, of substantially tubular shape and preferably made of non-magnetic material, at the ends whereof a safety electromagnet means 4 and a cut-off means 2 of the fuel gas, substantially a sleeve, are respectively arranged.
  • a cavity 100 is provided within which a stem 21 provided with an element 30 sensitive to the magnetic field is placed sliding.
  • Figure 1 shows a section of the electro-actuator 1 according to the present invention in the closed or rest position.
  • a cavity 100 housing a bottom 101 is provided, within which a cursor 30 integral with a stem 21 is placed, said cursor 30 being sensitive to the magnetic field.
  • Said bottom 101 cooperates with the cursor 30 to achieve the magnetic force that operates the safety closing of the electro-actuator 1 according to the present invention.
  • said cursor 30 comprises a permanent magnet, while said bottom 101 comprises a ferro-magnet.
  • said cursor 30 may advantageously comprise a ferro-magnet, while the bottom 101 may comprise a permanent magnet, without altering the correct operation of the electro-actuator 1, or that both may comprise permanent magnets.
  • the magnetic interaction between the bottom 101 and the cursor 30, due to the materials with which they are made and to their reciprocal position, must ensure for any condition of use and for any position of the shutter 20 or the electromagnet 4, the "normally closed" condition.
  • the position of the cursor 30 and the bottom 101, the materials with which they are created and the switching on and/or off modes of the burner, are thus parameters to be chosen and defined in order to ensure the "normally closed" condition of the electro-actuator 1.
  • Said bottom 101 comprising a disk of ferromagnetic material, is provided with a central hole 111 for the passage and the sliding of the stem 21, said stem 21 being integral with said cursor 30.
  • One end of said stem 21, advantageously made of non-magnetic material, is provided with at least one ferromagnetic element 32 that cooperates with the safety electromagnet means 4; the other end of the stem 21 is integral with the shutter 20.
  • the shutter 20 cooperates with the sleeve 2 of the fuel gas; in particular said shutter 20 opens or closes the outlet channel 22 of the fuel gas, allowing the passage of the fuel gas from the conduit 23 to said outlet channel 22, towards the corresponding burner (not shown).
  • the safety electromagnet 4 is advantageously controlled through the thermocouple placed in the proximity of the flame zone of the burner, according to what shown and described above with reference to the prior art.
  • thermocouple does not provide any type of electric current to said electromagnet 4, which is then de-energized and does not produce any magnetic field; in this case there is not any kind of significant interaction between the electromagnet 4 and the ferromagnetic element 32.
  • the closing of the electro-actuator 1 according to this variant of the invention is guaranteed by the magnetic force existing between the cursor 30 and the bottom 101; said magnetic force keeps the stem 21 fixed and stable, so as to lock the shutter 20 at the mouth of the outlet channel 22 of the fuel gas, preventing the entry to the fuel gas.
  • the electromagnet 4 is de-energized, so there are not significant attractive magnetic forces between said electromagnet 4 and the ferromagnetic element 32; the stem 21, therefore, is translated toward the sleeve 2 by the attractive magnetic force between the bottom 101 and the cursor 30.
  • Said magnetic force achieves and ensures the closing of the electro-actuator 1, engaging the shutter 2 at the mouth of the outlet channel 22 of the fuel gas, so as to occlude it.
  • Figure 2 shows a section view of the electro-actuator according to the present invention in the open or work position.
  • the electro-actuator 1 is visible in the open position, i.e. with the outlet channel 22 of the fuel gas communicating with the conduit 23 of the fuel gas.
  • the user manually activates the electro-actuator 1, by translating the stem 21 towards said electromagnet 4, bringing the ferromagnetic element 32 in contact with said electromagnet 4.
  • the shutter 20, being positioned on the stem 21, is moved away from said outlet channel 22 of the fuel gas 22, thus allowing the gas to enter from the outlet channel 22 and reach the burner, allowing the switching on thereof.
  • thermocouple When the flame of the burner is switched on, the thermocouple starts to generate an electric current that energizes the electromagnet 4, ensuring the magnetic coupling between said electromagnet 4 and the ferromagnetic element 32.
  • the attractive magnetic force between the electromagnet 4 and the ferromagnetic element 32 is greater than the attractive magnetic force present between the cursor 30 and the bottom 101; this allows to keep the electromagnet 4 and the ferromagnetic element 32 integral.
  • thermocouple With the flame switched on the mechanical action (exerted by the user through the actuating means) that kept the electromagnet 4 and the ferromagnetic element 32 in contact is suspended, and the opening of the valve is ensured by the thermocouple, which generates the electric current necessary to keep the electromagnet 4 energized.
  • thermocouple In case of accidental switching off of the flame, the thermocouple does not generate any potential difference, as a consequence the electromagnet 4 is no longer fed electrically and the magnetic coupling with the ferromagnetic element 32 of the stem 21 is lost; this results in the closing of the electro-actuator 1 due to the magnetic force of attraction between the bottom 101 and the cursor 30.
  • the user If wished to proceed with the voluntary switching off of the burner, the user, through suitable actuating means, uncouples the ferromagnetic element 32 from the electromagnet 4, or stops the passage of electric current to the electromagnet; also in this case the closing of the electro-actuator 1 is given by the attractive force between the cursor 30 and the bottom 101.
  • the closing command may further be obtained by means of a microswitch on the thermocouple circuit or through a by-pass circuit of the electromagnet 4, through which when the user closes, all or part of the electric current generated by said thermocouple passes, making the magnetic field of the electromagnet 4 so small as to allow the pressing force to close the passage of the fuel gas.
  • the embodiment shown in Fig. 1 and Fig. 2 described above provides to keep the valve in the closed position through a magnetic force generated by at least one ferromagnetic element and at least one permanent magnet.
  • a construction variant (not shown) provides to employ a repulsive force.
  • Said configuration (valve closed in the rest condition) remains such until the user manipulates the electro-actuator 1 through the actuating means to switch on the burner of the cooktop.
  • an elastic force is used, normally exerted by a compression helical spring in order to achieve the "normally closed” condition.
  • the electro-actuator 1 is characterised in that it achieves the "normally closed” condition through a magnetic force and uses it to ensure the closing of the outlet channel 22 of the fuel gas when said electric actuator 1 is closed or in rest condition.
  • the spring is a component subject to constant mechanical stress, resulting in deterioration and wear of the elastic element that may lead to operating problems.
  • the spring may jam or stop compromising the safety of the valve, while the magnetic force existing between a ferro-magnet and a permanent magnet, by its nature, does not present issues of this kind.
  • Figure 3 shows a section of the electro-actuator 1 according to the present invention in the closed or rest position.
  • the electro-actuator 1 in addition to the elements already described, advantageously comprises a solenoid 33 connected to the walls of the said support structure 10 through the support element 330.
  • Said solenoid 33 is coaxial with respect to the support structure 10 and cooperates with the cursor 30 to achieve the closing and opening of the electro-actuator 1.
  • Figure 4 shows a section view of the electro-actuator according to the present invention in the open or work position, that is with the outlet channel 22 of the fuel gas communicating with the conduit 23 of the fuel gas.
  • the user by means of suitable actuating means (not shown), activates the electrical supply to the solenoid 33, which immediately creates a magnetic field inside the support element 330.
  • Said induced magnetic field exerts a force on the cursor 30 forcing the stem 21 to translate towards the electromagnet 4, the force generated by said induced magnetic field being greater and of opposite direction with respect to the attractive magnetic force existing between the bottom 101 and the cursor 30.
  • the translation of the stem 21 brings the ferromagnetic element 32 in contact with the surface of the electromagnet 4 and opens the outlet channel 22 of the fuel gas.
  • the gas passage is ensured by the solenoid 33, which continues to be fed electrically for said time interval, so as to maintain, through the interaction between the induced magnetic field and the cursor 30, the ferromagnetic element 32 in contact with the electromagnet 4.
  • the electromagnet 4 is no longer fed electrically by the thermocouple and the magnetic coupling with the ferromagnetic element 32 is lost; the closing of the electro-actuator 1 is carried out by the magnetic force of attraction between the bottom 101 and the cursor 30.
  • the user If wished to proceed with the voluntary switching off of the burner, the user, through suitable actuating means, activates the electrical supply to the solenoid 33, but with reversed polarity compared to the switching on signal, so as to generate a magnetic field in the opposite direction to the previous, or interrupting the passage of electric current in the electromagnet 4.
  • the magnetic field induces the cursor 30 to move toward the sleeve 2, by uncoupling the ferromagnetic element 32 from the electromagnet 4, and locking the shutter 20 at the mouth of the outlet channel 22 of the fuel gas, through said magnetic force.
  • Said configuration that is of closed valve in rest condition, remains such until the user manipulates the electro-actuator 1 through the actuating means to switch on the burner of the cooktop.
  • the electro-actuator 1 provides for powering the solenoid 33 only during the switching on and voluntary switching off step of the burner, while as regards the normal activity of the burner the solenoid 33 is de-energized.
  • Said solution allows to reduce the energy absorption of the electro-actuator 1 according to the present invention and protects from excessive heating of the electrical parts due to the long operating times.
  • the typical operating voltage for the solenoid 33 is substantially less than or equal to 24V in direct current and the number of solenoid coils is substantially greater than or equal to 200.
  • the duty cycle, or useful work cycle is the fraction of time that an entity passes in an active state in proportion to the total time examined, for example considering a square-wave signal the duty cycle is the ratio between the duration of the active signal and the total period of the signal, and serves to express how much portion of period the signal is active for.
  • the electro-actuator 1 allows the switching on and switching off of the burner from remote locations, because the actuating commands carried out by the user are essentially of the electrical and non-mechanical type.
  • Figure 5 shows a section view of a further possible executive variant of the electro-actuator according to the present invention.
  • the pressing force is of elastic nature and the electro-actuator 1 is maintained in its normally closed position by an elastic loading means, advantageously a compression helical spring 200.
  • the magnetic force (that keeps the outlet channel of the fuel gas closed) has been replaced with an elastic force given by said spring 200.
  • a cursor 210 comprising a ferromagnetic element.
  • Said cursor 210 cooperates with the bottom 102, also made of ferromagnetic material, placed inside the cavity 100.
  • the user activates the electrical supply to the solenoid 33, generating a magnetic field that induces the cursor 210 to translate towards the electromagnet 4, the force generated by said induced magnetic field being greater and of opposite direction with respect to the elastic force that the compression helical spring 200 exerts on the shutter 20.
  • the shutter 20 is moved away from said outlet channel 22 of the fuel gas, thus allowing the gas to enter from the outlet channel 22 and reach the burner.
  • the translation of the stem 21 brings the ferromagnetic element 32 in contact with the surface of the electromagnet 4.
  • the closing command is obtained substantially with the annulment of the electric current generated by the thermocouple.
  • Fig. 5 may provide the use of the cursor 210 only, eliminating the bottom 102, provided that said cursor 210 is made of magnetic material so as to be able to be controlled by the solenoid 33.
  • the electro-actuator 1 comprises at least a pressing/pulling force that achieves the normally closed condition, interrupting the passage of the fuel gas to the burner.
  • Said pressing/pulling force may advantageously be of elastic or magnetic nature, according to the construction variants.
  • the electro-actuator 1 comprises at least an elastic means, such as for example a compression spring, while in the case of pressing/pulling force said electro-actuator comprises at least one ferromagnetic element and at least one permanent magnet, suitably arranged and cooperating with each other.
  • said pressing/pulling force is susceptible to be won by the command forces exerted for the opening of said outlet channel 22 and from said anchoring force between the ferromagnetic element 32 and the electromagnet 4.
  • the opening and closing command of the electro-actuator 1 With regards to the opening and closing command of the electro-actuator 1 according to the present invention, it can be advantageously manual or electrically controlled.
  • the opening and closing by electric control takes place through the interaction between a cursor, sensitive to the magnetic field, and an electromagnet, advantageously a solenoid 33.
  • the opening and closing command may be exerted through said solenoid 33, in particular through the inversion of its poles.
  • the opening of the electro-actuator 1 takes place via the solenoid 33 that pushes said cursor towards the bottom 102, while the closing command may be obtained substantially causing the annulment of the electric current generated by the thermocouple.
  • Figure 6 shows the electro-actuator 1 according to the present invention provided with an interference membrane 230 placed in proximity of the stem 21 inside the conduit 23 of the fuel gas, in order to prevent the inflow of said fuel gas inside the same electro-actuator.
  • interference membrane 230 is applicable to all the executive variants described.
  • Fig. 7 compares two section views of the electro-actuator according to the present invention shown in the open condition and in the closed condition.
  • Said force F F is the pressing/pulling force that operates the safety closing of said electro-actuator 1, and is susceptible to be won by the command forces Fs exerted for the opening of said outlet channel 22 and by said anchoring force F P . Additionally the anchoring force F P is such that:
  • the electro-actuator according to the present invention is characterised by the simultaneous existence of all the following conditions (where the modules of the forces must be considered):
  • Fs may be considered approximately constant as the position X varies and equal to F S_MAX(+) when the resultant of the forces on the element 30 acts in the positive direction of the axis x (opening command of the outlet channel 22); F S_MAX(-) when said resultant acts in the negative direction of the same axis (closing command of the outlet channel 22).
  • Fs may take a positive value FS_MAX(+) and a negative value F S_MAX(-) corresponding to the sign of the electric current that feeds the solenoid 33.
  • Figure 8 shows a summary table of the parameters and possible operating configurations of the electro-actuator according to the present invention.
  • the table shows:
  • command ON(+) provides for the opening of the electro-actuator 1
  • command ON(-) provides for the closing of the said electro-actuator 1.
  • the electro-actuator according to the invention may for example be very useful for the supply of the premix burners for cooktops, both of the atmospheric type and blown type such as those described in Italian patent documents AN2014A000130 , AN2014A000176 , AN2015A000041 , AN2015A00042 , AN2015A000060 , AN2015A000061 and 102015000018411 .
  • premix burner it is meant a burner in which the primary air is fed in amounts sufficient for the complete combustion without the need for the supply of secondary air on the flames.
  • blown burner it is meant a burner in which the primary air intended to take part in the combustion is not drawn by Venturi effect but is fed into the same burner through a fan and in precisely controlled amounts. In such burners the primary air therefore enters through calibrated orifices and in many cases it is appropriate that it is fed into or intercepted simultaneously upon the feeding/interception of the gas.
  • Figs. 9a and 9b show two examples of gas valves 25 suitable for blown burners and wherein the electro-actuator according to the invention, which is not shown in details, may be used.
  • Both figures with 21 indicate the stem whereto one or more shutters 20 are constrained that intercept the passage of gas and air from the respective distribution conduits 23 and 24 towards the outlet channel 22 to the burner.
  • Fig. 9a shows two valves 25 in each of which a corresponding single shutter 20 intercepts two concentric air and gas orifices while in figure 9b the stem 21 carries two shutters 20 dedicated the one to the interception of the gas and the other of the air.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electromagnets (AREA)
EP16757057.1A 2015-07-23 2016-07-21 Electro-pilotstatic valve for gas burners Active EP3325881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A002426A ITUB20152426A1 (it) 2015-07-23 2015-07-23 Valvola elettro-pilostatica per bruciatori gas
PCT/IB2016/001043 WO2017013487A1 (en) 2015-07-23 2016-07-21 Electro-pilotstatic valve for gas burners

Publications (2)

Publication Number Publication Date
EP3325881A1 EP3325881A1 (en) 2018-05-30
EP3325881B1 true EP3325881B1 (en) 2021-06-02

Family

ID=54542340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16757057.1A Active EP3325881B1 (en) 2015-07-23 2016-07-21 Electro-pilotstatic valve for gas burners

Country Status (6)

Country Link
US (1) US20180266684A1 (zh)
EP (1) EP3325881B1 (zh)
CN (1) CN107949748A (zh)
BR (1) BR112018001029B1 (zh)
IT (1) ITUB20152426A1 (zh)
WO (1) WO2017013487A1 (zh)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290047A (en) * 1938-11-10 1942-07-14 Milwaukee Gas Specialty Co Safety device for heating and other apparatus
US2290048A (en) * 1938-12-12 1942-07-14 Milwaukee Gas Specialty Co Safety device for heating and other apparatus
US2637390A (en) * 1951-12-10 1953-05-05 Tappan Stove Co Automatic ignition and control mechanism for oven burners
US2637391A (en) * 1952-02-01 1953-05-05 Tappan Stove Co Automatic ignition and control mechanism for oven burners
US2637392A (en) * 1952-05-05 1953-05-05 Tappan Stove Co Oven burner control mechanism
US2637393A (en) * 1952-06-13 1953-05-05 Tappan Stove Co Automatic ignition and control mechanism for gaseous fuel burners
TW233336B (zh) * 1993-02-26 1994-11-01 Rinnai Kk
IT1293697B1 (it) * 1997-04-30 1999-03-10 Op Srl Ora Op Controls S R L Unita' valvolare di sicurezza e regolazione per un impianto a gas particolarmente un impianto di riscaldamento
ITPD20010240A1 (it) * 2001-10-10 2003-04-10 Sit La Precisa Spa Gruppo valvolare per il controllo dell'erogazione di un gas combustibile.
CN201014486Y (zh) * 2007-01-31 2008-01-30 深圳万呵科技有限公司 一种燃气燃烧器
TW200936960A (en) * 2008-02-20 2009-09-01 Grand Mate Co Ltd LPG flow rate control valve
KR101003791B1 (ko) * 2010-06-10 2010-12-24 박승형 가스 안전장치
US9791171B2 (en) * 2014-07-28 2017-10-17 Clearsign Combustion Corporation Fluid heater with a variable-output burner including a perforated flame holder and method of operation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US20180266684A1 (en) 2018-09-20
BR112018001029A2 (pt) 2018-09-18
EP3325881A1 (en) 2018-05-30
WO2017013487A1 (en) 2017-01-26
BR112018001029B1 (pt) 2022-07-12
ITUB20152426A1 (it) 2017-01-23
CN107949748A (zh) 2018-04-20

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