EP1243857B1 - Fan for combustion air - Google Patents

Fan for combustion air Download PDF

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Publication number
EP1243857B1
EP1243857B1 EP02001432A EP02001432A EP1243857B1 EP 1243857 B1 EP1243857 B1 EP 1243857B1 EP 02001432 A EP02001432 A EP 02001432A EP 02001432 A EP02001432 A EP 02001432A EP 1243857 B1 EP1243857 B1 EP 1243857B1
Authority
EP
European Patent Office
Prior art keywords
fan
air
mass flow
sensor
combustion
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
EP02001432A
Other languages
German (de)
French (fr)
Other versions
EP1243857A1 (en
Inventor
Martin Geiger
Peter Goebel
Reinhold Hopfensperger
Rudolf Tungl
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.)
Ebm Papst Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
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
Priority to DE10114405 priority Critical
Priority to DE10114405A priority patent/DE10114405B4/en
Application filed by Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP1243857A1 publication Critical patent/EP1243857A1/en
Application granted granted Critical
Publication of EP1243857B1 publication Critical patent/EP1243857B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/60Devices for simultaneous control of gas and combustion air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226Fan casings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/02Regulating fuel supply conjointly with air supply
    • F23N1/022Regulating fuel supply conjointly with air supply using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/18Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/184Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/18Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/18Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/185Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00Pretreatment or prehandling
    • F23N2221/10Analysing fuel properties, e.g. density, calorific
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00Ventilators
    • F23N2233/06Ventilators at the air intake
    • F23N2233/08Ventilators at the air intake with variable speed

Description

The invention relates to a fan for combustion air in one wall / floor standing boiler. Such blowers are used in Household heating systems with premixing surface burner for Heating either from service water or the heating water.

In the prior art, the control and the regulation takes place in generally via pneumatically controlled gas valves, however due to their required high control performance to an increased Volume flow of combustion air lead, as he for the actual Power generation is not required.

From WO 86/04663 is a device for a furnace known, in a burner, the combustion air is supplied via a blower. In front of the blower entrance is a Inlet pipe arranged, in which an auxiliary blower installed is. The auxiliary fan has an additional intake on, in which arranged in the front area a Durchmeßmegerät is. The Durchschlußmeßgerät is provided with a donor and is connected via a line with a control device in Signal connection. The control device controls one between the Additional blower and the inlet opening provided aperture as well the motor of the additional controller.

From DE 2 258 558 an oil or gas heated water heater known with a blower, which by means of a drive motor Promotes combustion air to a burner, wherein an inlet nozzle in the air inlet of the blower as a differential pressure generator or differential pressure generator is formed. The differential pressure can be one Actuate pressure switch whose force to monitor the volume of air delivered or to regulate the amount of gas in Serve dependent on the volume of air delivered.

The invention is therefore based on the object to a blower create an adequate output according to the desired Power requirement, i. Temperature of the service water or the heating, provides.

As a solution to this problem, a fan with a blower housing and an impeller for combustion air in one wall / floor standing boiler proposed that has an air inlet (Suction side) and an air outlet (pressure side) has and with a supply line for a preferably gaseous Combustion medium is equipped, wherein at the air inlet a Sensor device arranged to determine the air mass flow which is operatively connected to an electronic control / regulator unit and to these signals for conditioning the ratio Combustion medium / combustion air depending sends the desired heat output, the sensor device is arranged on a ring nozzle assembly.

With such a fan, a device is provided, the one full mixing surface burner by capturing of the air and gas mass flow a homogeneous emission-poor Provides combustion and permanently guaranteed.

By combining the blower with a supply line for the gaseous combustion medium is provided a compact unit, the installation effort in the production of the Boiler considerably reduced. By detecting the mass flow the combustion air and / or the mass flow of the combustion medium directly at the air intake one receives for the Control and regulation necessary actual values without interference, so that the control of the mixing ratio accurate adjustment allowed and provided a low-emission combustion become.

It is particularly advantageous if the sensor device a electronic air mass flow anemometer is. Such a thing Anemometer has proven itself in a wide variety of measurement areas and provides sufficiently accurate signals to determine the mass flow a gaseous medium.

A particularly advantageous embodiment is that the annular nozzle arrangement is formed on the air inlet of the blower is. This particular arrangement for the location of the sensor device allows a trouble-free detection of the mass flow, because at this point a quasi laminar flow and the measured states are homogeneous over the cross-sectional area can be viewed on the suction side.

It is particularly advantageous if the sensor device is in a Bypass is arranged in the gap of the annular nozzle assembly opens. This will be an optimal mass flow measurement supplied to the sensor device, so that the corresponding Measurement signals an error-free determination of the actual mass flow in the main stream.

In a likewise inventive development of the Invention includes the annular nozzle assembly in addition to the die clearance for the air mass measurement another nozzle gap for the supply of the combustion medium. This special training allows a very homogeneous Mixing of the combustion medium with the combustion air.

It may be favorable that in the area of the gas nozzle gap a further sensor device is arranged, the sends corresponding signals to the control / regulator unit. This makes it possible, regardless of device-fixed set values of the combustion gas optimal combustion conditions to accomplish.

It may be advantageous for the annular nozzle arrangement to be more integral Part of the housing wall at the air inlet of the blower is. It is favorable that the annular nozzle arrangement surrounds the main flow of combustion air at the air inlet. By this arrangement, a steady homogeneous suction the measuring air flow through the corresponding nozzle gap ensured.

In another embodiment, it may be convenient that the annular nozzle arrangement pre-set an input channel is. It can at a favorable training of the bypass enter the input channel. However, it can also be the bypass into an annular gap in the interior of the inlet channel, so that according to the pressure distribution over the Cross section a uniform intake of the measuring air flow is ensured.

In another embodiment, it may be convenient that controlled the gas supply via a rotary valve / control valve This is an integral part of the blower housing is. It is advantageous if this rotary valve / control valve for the gas supply on the suction side the blower is formed. This can be a rational Production can be achieved.

The inventive construction advantageously allows that the electronic engine commutation the mass flow evaluation takes over and depending on the result the evaluation controls the speed of the fan motor.

It is particularly advantageous if the electronic engine commutation the mass flow analysis takes over and both the speed of the fan motor as well as the gas supply regulates.

Further features of the invention will become apparent from the figures shown and described in detail below Exemplary embodiments.

In the figures show:

  • 1 is a schematic sectional view of a first embodiment of a blower according to the invention,
  • 2 shows a second embodiment of a blower according to the invention,
  • 3 shows a third embodiment of a blower according to the invention,
  • 4 shows a fourth embodiment of a blower according to the invention,
  • Fig. 5 is a schematic plan view of an inventive fan with a gas supply at the air outlet.
  • Fig. 1 shows a first embodiment of the invention Blowers for combustion air, as in so-called wall / floor-standing boilers is used. It consists of a fan 1 with a fan housing 2 and a fan 2 ', with an air inlet 3 and an air outlet 4. The air inlet is the suction side of the blower, whereas the air outlet designates the pressure side. In the embodiment of the invention shown in FIG. 1 is a supply line 5 for a preferably gaseous combustion medium educated. At the air inlet 3 is a sensor device 6 arranged to determine the air mass flow serves. The sensor device 6 indicates signals a control control unit 7 that controls the combustion, e.g. the ratio combustion medium / combustion air in Depending on the desired heating power setting.

    The control device 6 consists of an electronic Air mass anemometer, as commercially available is.

    At the air inlet 3, an annular nozzle arrangement 8 is arranged, wherein the sensor device 6 at this annular nozzle assembly 8 is attached. The sensor device 6 is in the in Fig. 1 embodiment arranged in a bypass 9, which is in the gap 10 of the Ringdüsenanordung. 8 opens.

    The ring nozzle assembly 8 has in the illustrated embodiment in addition to the nozzle gap 10 for air mass measurement another nozzle gap 11 (gas nozzle gap) for the supply of the combustion medium.

    In the gas nozzle gap 11 is another sensor device 12 formed, the corresponding signals in terms of Mass flow of the combustion gas to the control unit 7 sends.

    From the signals of the air mass flow and those of the Gas mass flow calculated by the control unit the corresponding Manipulated variables to the respective target values reach, if these deviate from the actual values.

    The annular nozzle arrangement is an integral part of Housing wall 13 of the blower formed. Here, the Housing wall a part of the ring nozzle for the combustion gas form.

    The annular nozzle assembly 8 surrounds the main stream of combustion air at the air inlet 3 annular. This will be a homogeneous mixing of the combustion gas with the main air flow achieved.

    While in the embodiment of FIG. 1, the sensors in separate components in the corresponding Lines or annular nozzle sections are housed, is according to embodiment of FIG. 2, the sensor arrangement designed so that a common partition between the annular nozzle for the air mass flow and the gas flow is formed by a measuring chip, so that a compact measuring unit is obtained.

    Fig. 3 shows a next embodiment of an inventive Blower training, where an input channel 14 of the annular nozzle assembly 8 is vorgesetzt. At this Embodiment is the sensor device 6 for the mass air flow arranged in a bypass line, in the Inlet channel 14 opens. Inside the input channel 14th is in front of an annular gap 15 a covered annular channel 17th formed in the bypass 9 opens. By annular Intake becomes a homogeneous intake of the mass flow measuring volume achieved through the bypass 9 through.

    In the embodiment shown in Fig. 4 is the Bypass 9 is formed so that its opening substantially is normal on the wall of the input channel 16.

    In Fig. 4 is exemplary of all other embodiments applicable a rotary valve / control valve 16 is shown that is controlled by the control / regulating unit 7 becomes. The rotary valve / regulator valve is an integral part of the housing 2. In the illustrated embodiment is this rotary valve / regulator valve 16 for the Gas supply to the suction side of the blower 2 is formed.

    Exemplary for all other embodiments is in Fig. 4, the motor 18 of the blower 1 shown, wherein the Control / regulator unit 7 together with the electronic engine commutation the mass flow analysis takes over and As a result, the speed of the fan motor can be controlled can. The control electronics are designed so that either at constant engine speed, the gas supply regulated or it may be at a continuous Soll-IstVergleich the desired power both the speed of the Adjusted engine and the gas supply in a corresponding manner become.

    5 shows an embodiment according to the invention in side view, in which the gas supply 5 does not have a Ring nozzle at the air inlet, but near the pressure side takes place at the air outlet.

    The invention is not limited in their execution the preferred embodiments given above. Rather, a number of variants is conceivable, which from the illustrated solution even with fundamentally different makes use of the same type.

    Claims (15)

    1. A fan (1) for combustion air in a wall-mounted/floor-standing heating boiler, with a fan casing (2) and a fan wheel (2'), with an air intake (3) (inlet side) and an air exit (4) (delivery side) and with a supply line (5) for a preferably gaseous combustion medium, wherein to determine the air mass flow rate a sensor means (6) is located at the air intake (3) which is operably linked with an electronic control unit/controller (7) and to said unit sends signals for processing the ratio of combustion medium/combustion air depending on the desired calorific output, wherein the sensor means (6) is formed at a ring nozzle arrangement (8).
    2. A fan as claimed in claim 1, characterized in that the sensor means (6) is an electronic air mass flow anemometer.
    3. A fan as claimed in claim 1 or 2, characterized in that the ring nozzle arrangement (8) is formed at the air intake (3).
    4. A fan as claimed in one of the claims 1 to 3, characterized in that the sensor means (6) is formed in a bypass (9) which opens into the gap (10) of the ring nozzle arrangement (8).
    5. A fan as claimed in one of the claims 3 or 4, characterized in that the ring nozzle arrangement (8) has an additional nozzle gap (11) (gas nozzle gap) for the supply of the combustion medium in addition to the nozzle gap (10) for the air mass flow measurement.
    6. A fan as claimed in claim 5, characterized in that in the area of the gas nozzle gap (11) another sensor means (12) is provided which delivers the corresponding signals to the control unit/controller (7).
    7. A fan as claimed in one of the claims 3 to 6, characterized in that the ring nozzle arrangement (8) is an integral part of the casing wall (13) at the air intake (3) of the fan (2).
    8. A fan as claimed in one of the claims 3 to 6, characterized in that the ring nozzle arrangement (3) surrounds the main combustion air stream at the air intake (3).
    9. A fan as claimed in one of the claims 1 to 8, characterized in that an intake duct (14) is placed before the ring nozzle arrangement (8).
    10. A fan as claimed in one of the claims 1 or 9, characterized in that the bypass (9) opens into the entry duct (14).
    11. A fan as claimed in one of the claims 9 or 10, characterized in that the bypass (9) opens into an annular gap (15) inside the entry duct (14).
    12. A fan as claimed in one of the claims 1 or 11, characterized in that a rotary valve/control valve (16) for the gas supply is an integral part of the casing (2).
    13. A fan as claimed in claim 12, characterized in that the rotary valve/control valve (16) for the gas supply is located on the intake side of the fan (2).
    14. A fan as claimed in one of the claims 1 or 13, characterized in that the electronic motor commutation assumes the mass flow evaluation and controls the speed of the fan motor.
    15. A fan as claimed in one of the claims 1 or 13, characterized in that the electronic motor commutation assumes the mass flow evaluation and controls the speed of the fan motor and the gas supply.
    EP02001432A 2001-03-23 2002-01-21 Fan for combustion air Active EP1243857B1 (en)

    Priority Applications (2)

    Application Number Priority Date Filing Date Title
    DE10114405 2001-03-23
    DE10114405A DE10114405B4 (en) 2001-03-23 2001-03-23 Blower for combustion air

    Publications (2)

    Publication Number Publication Date
    EP1243857A1 EP1243857A1 (en) 2002-09-25
    EP1243857B1 true EP1243857B1 (en) 2005-12-14

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    Family Applications (1)

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    EP02001432A Active EP1243857B1 (en) 2001-03-23 2002-01-21 Fan for combustion air

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    EP (1) EP1243857B1 (en)
    CN (1) CN100464124C (en)
    DE (1) DE10114405B4 (en)

    Cited By (14)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102011102984A1 (en) * 2011-05-23 2012-11-29 Ernst Pennekamp Gmbh & Co. Ohg Apparatus for heating furnace installations for goods, in particular for glassware, and furnace installation provided therewith
    US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
    US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
    US8905063B2 (en) 2011-12-15 2014-12-09 Honeywell International Inc. Gas valve with fuel rate monitor
    US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
    US9074770B2 (en) 2011-12-15 2015-07-07 Honeywell International Inc. Gas valve with electronic valve proving system
    US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
    US9557059B2 (en) 2011-12-15 2017-01-31 Honeywell International Inc Gas valve with communication link
    US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
    US10024439B2 (en) 2013-12-16 2018-07-17 Honeywell International Inc. Valve over-travel mechanism
    US10203049B2 (en) 2014-09-17 2019-02-12 Honeywell International Inc. Gas valve with electronic health monitoring
    US10215291B2 (en) 2013-10-29 2019-02-26 Honeywell International Inc. Regulating device
    US10564062B2 (en) 2016-10-19 2020-02-18 Honeywell International Inc. Human-machine interface for gas valve
    US10697815B2 (en) 2018-06-09 2020-06-30 Honeywell International Inc. System and methods for mitigating condensation in a sensor module

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    DE102004055716C5 (en) 2004-06-23 2010-02-11 Ebm-Papst Landshut Gmbh Method for controlling a firing device and firing device (electronic composite I)
    US7922481B2 (en) * 2004-06-23 2011-04-12 EBM—Papst Landshut GmbH Method for setting the air ratio on a firing device and a firing device
    EP2048439B1 (en) * 2007-10-12 2014-06-18 ebm-papst Landshut GmbH Ventilator with integrated control valve
    US8286594B2 (en) * 2008-10-16 2012-10-16 Lochinvar, Llc Gas fired modulating water heating appliance with dual combustion air premix blowers
    DE202010018511U1 (en) * 2010-03-10 2017-03-24 Ebm-Papst Landshut Gmbh Pneumatic compound with mass balance
    US9851103B2 (en) 2011-12-15 2017-12-26 Honeywell International Inc. Gas valve with overpressure diagnostics
    US9846440B2 (en) 2011-12-15 2017-12-19 Honeywell International Inc. Valve controller configured to estimate fuel comsumption
    US9835265B2 (en) 2011-12-15 2017-12-05 Honeywell International Inc. Valve with actuator diagnostics
    US10422531B2 (en) 2012-09-15 2019-09-24 Honeywell International Inc. System and approach for controlling a combustion chamber
    US9841122B2 (en) 2014-09-09 2017-12-12 Honeywell International Inc. Gas valve with electronic valve proving system
    DE102015109684B3 (en) * 2015-06-17 2016-09-01 Ebm-Papst Landshut Gmbh Nozzle device with dust collector and method for measuring an air mass flow
    US10503181B2 (en) 2016-01-13 2019-12-10 Honeywell International Inc. Pressure regulator
    DE102016118369A1 (en) * 2016-09-28 2018-03-29 Ebm-Papst Mulfingen Gmbh & Co. Kg Suction nozzle and blow-out unit of a fan
    PL3301362T3 (en) * 2016-09-30 2020-08-24 Siemens Aktiengesellschaft Method of controlling turbulent flows
    ES2760451T3 (en) 2016-09-30 2020-05-14 Siemens Mobility GmbH Combustion unit with burner and device to measure the flow of turbulent currents

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    Cited By (15)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102011102984A1 (en) * 2011-05-23 2012-11-29 Ernst Pennekamp Gmbh & Co. Ohg Apparatus for heating furnace installations for goods, in particular for glassware, and furnace installation provided therewith
    US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
    US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
    US8905063B2 (en) 2011-12-15 2014-12-09 Honeywell International Inc. Gas valve with fuel rate monitor
    US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
    US9074770B2 (en) 2011-12-15 2015-07-07 Honeywell International Inc. Gas valve with electronic valve proving system
    US10697632B2 (en) 2011-12-15 2020-06-30 Honeywell International Inc. Gas valve with communication link
    US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
    US9557059B2 (en) 2011-12-15 2017-01-31 Honeywell International Inc Gas valve with communication link
    US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
    US10215291B2 (en) 2013-10-29 2019-02-26 Honeywell International Inc. Regulating device
    US10024439B2 (en) 2013-12-16 2018-07-17 Honeywell International Inc. Valve over-travel mechanism
    US10203049B2 (en) 2014-09-17 2019-02-12 Honeywell International Inc. Gas valve with electronic health monitoring
    US10564062B2 (en) 2016-10-19 2020-02-18 Honeywell International Inc. Human-machine interface for gas valve
    US10697815B2 (en) 2018-06-09 2020-06-30 Honeywell International Inc. System and methods for mitigating condensation in a sensor module

    Also Published As

    Publication number Publication date
    DE10114405B4 (en) 2011-03-24
    DE10114405A1 (en) 2002-09-26
    CN1737428A (en) 2006-02-22
    EP1243857A1 (en) 2002-09-25
    CN100464124C (en) 2009-02-25

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