US20140338660A1 - Gas powered heater - Google Patents
Gas powered heater Download PDFInfo
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- US20140338660A1 US20140338660A1 US14/357,947 US201214357947A US2014338660A1 US 20140338660 A1 US20140338660 A1 US 20140338660A1 US 201214357947 A US201214357947 A US 201214357947A US 2014338660 A1 US2014338660 A1 US 2014338660A1
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- United States
- Prior art keywords
- fuel gas
- canister
- gas
- support element
- powered heater
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
- F23D14/08—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
- A47J36/26—Devices for warming vessels containing drinks or food, especially by means of burners Warming devices with a burner, e.g. using gasoline; Travelling cookers, e.g. using petroleum or gasoline with one burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C13/00—Apparatus in which combustion takes place in the presence of catalytic material
- F23C13/06—Apparatus in which combustion takes place in the presence of catalytic material in which non-catalytic combustion takes place in addition to catalytic combustion, e.g. downstream of a catalytic element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/18—Radiant burners using catalysis for flameless combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/28—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid in association with a gaseous fuel source, e.g. acetylene generator, or a container for liquefied gas
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- 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
- F24C3/02—Stoves or ranges for gaseous fuels with heat produced solely by flame
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Food Science & Technology (AREA)
- Feeding And Controlling Fuel (AREA)
- Handcart (AREA)
Abstract
A gas powered heater (1) for use in a chafing trolley comprises a support element (10) defining a hollow interior region (12) for a disposable fuel gas canister (3), which is coupled to the support element (10) by a coupling element (15). Fuel gas from the fuel gas canister (3) is delivered through a pipe (42) to a fuel gas controller (17) and in turn to a fuel gas burner element (18). A lever (36) operates a control valve (45) in the fuel gas controller (17) for controlling the supply of fuel gas to the burner (18). The fuel gas controller is mounted on a mounting platform (28) and extends downwardly into the hollow interior region (12) of the support element (10) and is located offset to one side and spaced apart from the fuel gas canister (3). The location of the fuel gas controller (17) and in turn the fuel gas burner element (18) to one side of the fuel gas canister (3) permits the overall headroom required by the gas powered heater (1) to be minimised, so that the gas powered heater (1) is suitable for use in a chafing trolley.
Description
- The present invention relates to a gas powered heater, and in particular, to a gas powered heater for use in a chafing trolley or unit.
- Chafing trolleys and units are extensively used in the hotel, restaurant and catering industry for maintaining food, which has been cooked, at an elevated temperature. In general, such chafing trolleys and units are located in restaurants and dining rooms of hotels for maintaining the cooked food at an elevated temperature prior to serving of the food. Such chafing trolleys and units typically comprise a plurality of food trays, generally of stainless steel, into which food to be maintained at an elevated temperature is located. The food trays are located in a water tray containing water which is maintained at an appropriate temperature for maintaining the food in the food trays at the desired elevated temperature. A heater shelf is located in such chafing trolleys and units below the water tray on which heaters are supported for heating the water in the water tray, for in turn maintaining the food in the food trays at the elevated temperature. In general, the spacing between the water tray and the heater shelf is relatively small, and in general, is suitable for accommodating wick based heaters which burn a liquid fuel, such as alcohol, or a canned chemical in a solid or gel form. A problem with such wick based heaters is that they generally burn at a fixed temperature, and it is not possible to vary the heat output, which in turn prevents easy regulation of the temperature of the water in the water tray, and in turn the elevated temperature at which the food is being maintained. This is undesirable.
- A further disadvantage of such wick based heaters is that the liquid fuel is highly flammable, and can be easily spilt, thus leading to the possibility of fire and other safety problems. Additionally, such wick based heaters may include toxic chemicals or they may produce uneven flames and may also suffer from evaporation of toxic chemicals.
- Attempts have been made to produce a gas powered heater which would be suitable for such chafing trolleys and units, however, such gas powered heaters suffer from a number of disadvantages. Firstly, the spacing between the heater shelf and the water tray is such that it is difficult to produce a gas powered heater of suitably low height to fit within the confined headroom between the heater shelf and the water tray. PCT published Specification No. WO 03/083368 discloses gas powered heaters for use in a chafing trolley. However, these heaters suffer from a number of disadvantages in that the fuel gas is stored in liquid form under pressure in a rechargeable reservoir. A serious problem with the gas powered heaters disclosed in this PCT specification is that the reservoir requires to be recharged at regular intervals, which is inconvenient, and is also hazardous. Typically, recharging of the reservoir of such gas powered heaters is carried out in a kitchen where there are exposed flames, and there is a serious risk of fire during recharging of the reservoir of the gas powered heaters disclosed in this specification.
- Another gas powered heater which is provided for use with a chafing trolley or a chafing unit is disclosed in PCT published Specification No. WO 2008/119796. However, the gas powered heater disclosed in this PCT specification also has a rechargeable reservoir and thus suffers from similar problems as those of the gas powered heater of PCT Specification No. WO 03/083368.
- Additionally, and of particular importance is that because of the construction of the gas powered heaters of both PCT Specification No. WO 03/083368 and WO 2008/119796, the overall height of the gas powered heaters is relatively large, and requires headroom, which is not always available in chafing trolleys and units between the heater shelf and the water tray.
- There is therefore a need for a gas powered heater for use in a chafing trolley or unit which addresses at least some of the problems of known gas powered heaters.
- The present invention is directed towards providing such a gas powered heater.
- According to the invention there is provided a gas powered heater comprising a support element defining a hollow interior region and a downwardly facing open mouth providing access to the hollow interior region, the hollow interior region defining a canister accommodating location for accommodating a pressurised fuel gas canister therein in a substantially generally upright orientation, a coupling element located in the canister accommodating location of the hollow interior region secured to an upper portion of the support element, the coupling element being releasably engageable with an outlet port of a fuel gas canister for coupling the fuel gas canister to the support element in the canister accommodating location, a mounting platform formed in the support element, a fuel gas controller mounted on the mounting platform and extending downwardly therefrom into a valve accommodating location in the hollow interior region offset to one side of the canister accommodating location, the fuel gas controller being in communication with the coupling element through a fuel gas path for receiving fuel gas from the fuel gas canister through the coupling element, and a fuel gas burner element located externally of the support element above and substantially centrally aligned with the fuel gas controller, the fuel gas burner element communicating with the fuel gas controller for receiving fuel gas therefrom.
- Preferably, the support element comprises a top wall, and the coupling element is mounted on the top wall and extends downwardly into the canister accommodating location therefrom.
- Advantageously, the mounting platform is located at a level below the level of a portion of the top wall of the support element to which the coupling element is mounted.
- In one aspect of the invention the mounting platform is located at a level of at least 5 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted. Preferably, the mounting platform is located at a level of at least 7.5 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted. Advantageously, the mounting platform is located at a level of at least 10 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted.
- In another aspect of the invention the mounting platform is spaced apart laterally from the coupling element. Preferably, the canister accommodating location defines a longitudinally extending main central axis which in use extends substantially vertically. Advantageously, the canister accommodating location is adapted for accommodating a fuel gas canister with a vertically extending central geometrical axis of the fuel gas canister substantially coinciding with the main central axis of the canister accommodating location.
- In another aspect of the invention the valve accommodating location defines a longitudinally extending secondary central axis extending substantially parallel to the main central axis. Preferably, the fuel gas controller is located in the valve accommodating location with a longitudinally extending central axis of the fuel gas controller substantially coinciding with the secondary central axis of the valve accommodating location.
- In one aspect of the invention the support element comprises a side wall extending around the hollow interior region. Preferably, the side wall defines the downwardly facing open mouth.
- In another aspect of the invention the support element comprises an inclined wall extending around the top wall and inclining in a generally downwardly outwardly direction from the top wall. Preferably, a portion of the inclined wall terminates in the side wall of the support element. Advantageously, the inclined wall terminates in the mounting platform.
- In another aspect of the invention a first portion of the side wall of the support element defines a portion of the canister accommodating location. Preferably, the first portion of the side wall of the support element defines at least 180° of the canister accommodating location. Advantageously, the first portion of the side wall is of part cylindrical shape defining the main central axis of the canister accommodating location.
- In another aspect of the invention a second portion of the side wall of the support element defines a portion of the valve accommodating location. Preferably, the second portion of the side wall is of part cylindrical shape defining the secondary central axis of the valve accommodating location. Advantageously, the second portion of the side wall of the support element extends downwardly from the mounting platform.
- In a further aspect of the invention a pair of spaced apart tangential side walls join the first and second cylindrical portions of the side wall.
- In one aspect of the invention a carrier platform is mounted on the support element spaced apart above the mounting platform, and the fuel gas burner element is mounted on the carrier platform. Preferably, at least one pillar extending upwardly from the mounting platform supports the carrier platform above the mounting platform. Advantageously, the fuel gas burner element is mounted on the carrier platform with an inlet port thereof facing downwardly and being aligned with an upwardly facing outlet port of the fuel gas controller extending from the mounting platform for receiving fuel gas from the fuel gas controller.
- In one embodiment of the invention the inlet port to the fuel gas burner is spaced apart above the outlet port from the fuel gas controller to define an annular gap therebetween to in turn form a venturi mixer for mixing fuel gas being delivered to the fuel gas burner with air.
- In one aspect of the invention the outlet port of the fuel gas controller comprises an outlet jet through which fuel gas is delivered from the outlet port.
- Preferably, the fuel gas burner element and the fuel gas controller are in substantial vertical alignment with each other.
- In another aspect of the invention the fuel gas controller comprises a fuel gas control valve operable between a closed state isolating the fuel gas burner from the fuel gas supply, and a fully open state for delivering fuel gas to the fuel gas burner. Preferably, the fuel gas control valve is operable in a plurality of open states between the closed state and the fully open state for controlling the rate at which fuel gas is supplied to the fuel gas burner.
- In one aspect of the invention a control lever is operably coupled to the fuel gas control valve for facilitating manual operation of the fuel gas control valve between the closed state and the fully open state.
- In another aspect of the invention the fuel gas burner element comprises a housing having a gas catalytic combustion element located therein for converting fuel gas to heat by a catalytic reaction.
- Preferably, the gas catalytic combustion element is adapted to permit slippage of fuel gas therethrough, so that the fuel gas is burnt in a flame downstream of the catalytic combustion element.
- Advantageously, the housing of the burner element defines an upwardly facing open mouth, and the gas catalytic combustion element is located in the housing adjacent the open mouth thereof.
- In one embodiment of the invention a diffuser element is located in the housing of the fuel gas burner element upstream of the catalytic combustion element, and downstream of the inlet port to the fuel gas burner element. Preferably, the diffuser element is spaced apart from the gas catalytic combustion element.
- In one aspect of the invention the gas catalytic combustion element is spaced apart above the diffuser element.
- In another aspect of the invention the diffuser element comprises a central blank portion on which fuel gas from the inlet port of the fuel gas burner element impinges. Preferably, a plurality of perforations extend through the diffuser element offset from the central blank portion for accommodating fuel gas therethrough to the catalytic combustion element. Advantageously, the perforations extending through the diffuser element are located at spaced apart intervals around the central blank portion thereof.
- In another aspect of the invention the diffuser element comprises a planar plate member.
- In another aspect of the invention the planar plate member of the diffuser element substantially defines the cross-section of the housing of the fuel gas burner element.
- In one embodiment of the invention the support element is adapted to accommodate a fuel gas canister in the fuel gas accommodating location with a portion of the fuel gas canister extending downwardly from the canister accommodating location through the downwardly facing open mouth, so that the fuel gas canister acts as a stand for the gas powered heater.
- In another embodiment of the invention the depth of the side wall of the support element is such that a standard fuel gas canister extends downwardly from the canister accommodating location through the downwardly facing open mouth of the support element.
- In a further embodiment of the invention the support element is adapted to accommodate a fuel gas canister in the canister accommodating location with the fuel gas canister located entirely within the support element.
- In a still further embodiment of the invention a fuel gas canister of pressurised fuel gas in liquid form is located in the canister accommodating location coupled to the support element by the coupling element. Preferably, the fuel gas canister comprises a disposable pressurised fuel gas canister.
- In another embodiment of the invention the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height in the range of 50 mm to 150 mm. Preferably, the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height which does not exceed 100 mm. Advantageously, the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height of approximately 83 mm.
- In another embodiment of the invention the support element is adapted to accommodate a pressurised fuel gas canister of diameter not more than 100 mm and of overall height not more than 70 mm.
- Preferably, the support element is adapted for receiving a pressurised fuel gas canister of diameter of approximately 90 mm and of overall height of approximately 64 mm.
- The advantages of the invention are many. A particularly important advantage of the invention is that the headroom required by the gas powered heater according to the invention is relatively low. This advantage is largely achieved by virtue of the fact that the fuel gas controller and the fuel gas burner element are located by the support element offset to one side of the canister accommodating location, and thereby the overall height of the gas powered heater including the pressurised fuel gas canister is significantly lower than those known heretofore, and thus the gas powered heater according to the invention can operate with significantly less headroom than gas powered heaters known heretofore. Additionally, by virtue of the fact that the fuel gas controller and the fuel gas burner element are offset to one side of the canister accommodating location, the canister accommodating location can accommodate a fuel gas canister of height greater than fuel gas canisters known heretofore, and still maintain a relatively low overall height of the heater. A particularly important advantage achieved by this aspect of the invention is that the gas powered heater can be used with a standard pressurised disposable fuel gas canister, and thus, there is no need for the gas powered heater according to the invention to be provided with a rechargeable reservoir.
- The invention will be more clearly understood from the following description of some preferred embodiments thereof, which are given by way of example only, with reference to the accompanying drawings, in which:
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FIG. 1 is a perspective view of a gas powered heater according to the invention illustrated in use, -
FIG. 2 is a cross-sectional side elevational view of the gas powered heater ofFIG. 1 illustrated in use, -
FIG. 3 is a top plan view of a portion of the gas powered heater ofFIG. 1 , -
FIG. 4 is a cross-sectional side elevational view of the portion of the gas powered heater ofFIG. 3 on the line IV-IV ofFIG. 3 , -
FIG. 5 is an enlarged cross-sectional side elevational view of a detail of the gas powered heater ofFIG. 1 , -
FIG. 6 is a top plan view of a detail of the gas powered heater ofFIG. 1 , -
FIG. 7 is a cross-sectional side elevational view of the detail ofFIG. 6 of the gas powered heater ofFIG. 1 on the line VII-VII ofFIG. 6 , -
FIG. 8 is a perspective view of another detail of the gas powered heater ofFIG. 1 , -
FIG. 9 is a perspective view of a gas powered heater according to another embodiment of the invention, and -
FIG. 10 is a perspective view of a gas powered heater according to a further embodiment of the invention. - Referring to the drawings, and initially to
FIGS. 1 to 8 thereof, there is illustrated a gas powered heater according to the invention, indicated generally by the reference numeral 1. The gas powered heater 1 is particularly suitable for use in a chafing trolley or a chafing unit for maintaining cooked food at an elevated temperature, and is particularly suitable, as will be described in more detail below, for use in a chafing trolley or a chafing unit of the type which is suitable for use with gel burners. The gas powered heater 1 in this embodiment of the invention is adapted for use with a disposable proprietary pressurisedfuel gas canister 3, which is of the type in which fuel gas is supplied in liquid form under pressure. Thefuel gas canister 3 is of the type which is typically referred to as a gas cartridge, and is of capacity of 100 grams and comprises a base 4, a cylindrical side wall 5 which extends upwardly from the base 4, and atop wall 6 which inclines upwardly inwardly from the side wall 5 to an upwardly facingconnector 8 within which an outlet port is located. The diameter d of the side wall 5 is approximately 90 mm, while the overall height h of thecanister 3 from the base 4 to the top of theconnector 8 is approximately 64 mm, seeFIG. 2 . - Turning now to the gas powered heater 1, the gas powered heater 1 comprises a
support element 10 of stainless steel and of inverted dish shape which defines a hollowinterior region 12 and a downwardly facingopen mouth 14 to the hollowinterior region 12. Thefuel gas canister 3 is located in the hollowinterior region 12 as will be described below, and extends downwardly from the hollowinterior region 12 through theopen mouth 14, and as well as providing a supply of fuel gas to the gas powered heater 1, thefuel gas canister 3 also acts as a stand on which the fuel gas heater 1 stands in use. A coupling element 15 located in the hollowinterior region 12 and secured to thesupport element 10 releasably engages and secures thefuel gas canister 3 in the hollowinterior region 12 of thesupport element 10. Fuel gas is supplied from thefuel gas canister 3 as will be described in detail below through afuel gas controller 17 to a fuelgas burner element 18 where the fuel gas is converted to heat by a gascatalytic combustion element 20. The gascatalytic combustion element 20 permits slippage of fuel gas therethrough so that some of the fuel gas is burnt in a flame by theburner element 18. - Turning initially to the
support element 10, thesupport element 10 comprises atop wall 22 and aside wall 23 which extends around the hollowinterior region 12. Aninclined wall 25 extending around thetop wall 22 inclines in a generally outwardly downwardly direction towards afirst portion 27 of theside wall 23. A mountingplatform 28 is formed in thesupport element 10 which extends inwardly from asecond portion 29 of theside wall 23 to theinclined wall 25. The mountingplatform 28 is provided for mounting thefuel gas controller 17 in the hollowinterior region 12 of thesupport element 10 as will be described below. A pair of spaced aparttangential walls 30 extend between the first andsecond portions side wall 23 on respective opposite sides of thesupport element 10. - The
support element 10 defines acanister accommodating location 33 in the hollowinterior region 12 for accommodating thefuel gas canister 3 in thesupport element 10. Thecanister accommodating location 33 is partly defined by thefirst portion 27 of theside wall 23 which is of part cylindrical shape. The part cylindricalfirst portion 27 of theside wall 23 defines a geometrical central axis which defines a longitudinally extending maincentral axis 34 of thecanister accommodating location 33, which in use extends substantially vertically. The coupling element 15 couples and locates thefuel gas canister 3 in thecanister accommodating location 33 with a vertically extending central geometrical axis of thefuel gas canister 3 substantially coinciding with the maincentral axis 34 of thecanister accommodating location 33. - The
support element 10 also defines avalve accommodating location 35 in the hollowinterior region 12 which is offset to one side of thecanister accommodating location 33 for accommodating thefuel gas controller 17 spaced apart laterally from the coupling element 15, and in turn laterally spaced apart from thefuel gas canister 3. Thesecond portion 29 of theside wall 23 is of part cylindrical shape and defines a portion of thevalve accommodating location 35. Thesecond portion 29 of theside wall 23 defines a geometrical axis which defines a longitudinally extending secondarycentral axis 36 of thevalve accommodating location 35. The secondarycentral axis 36 extends parallel to the maincentral axis 34 of thecanister accommodating location 33, and in use extends substantially vertically. Aflange 39 extending outwardly and around theside wall 23 reinforces theside wall 23, and in turn thesupport element 10. - The coupling element 15 is secured to the
top wall 22 in the hollowinterior region 12 of thesupport element 10 and is centrally located in thecanister accommodating location 33 on the maincentral axis 34 for releasably engaging theconnector 8 of thefuel gas canister 3 with thefuel gas canister 3 located in thecanister accommodating location 33 with the central geometrical axis of thefuel gas canister 3 coinciding with the maincentral axis 34 of thecanister accommodating location 33. Arelease pin 40 located in the coupling element 15 and extending downwardly therein is provided for engaging and opening a valve (not shown) in the outlet port (also not shown) in theconnector 8 of thefuel gas canister 3. Such outlet ports in a connector of such afuel gas canister 3 will be well known to those skilled in the art. A fuelgas supply pipe 42 which is coupled to the coupling element 15 forms a fuel gas path through which fuel gas is supplied from thefuel gas canister 3 to a fuelgas inlet port 43 of thefuel gas controller 17. - The
fuel gas controller 17 comprises acontroller housing 44 within which acontrol valve 45 is housed. Fuel gas is supplied to thecontrol valve 45 from the fuelgas inlet port 43 as will be described below. Thecontrol valve 45 comprises a threaded housing 46 which is screwed into thecontroller housing 44 of thefuel gas controller 17. A threadedportion 47 of the housing 46 of thecontrol valve 45 extends through anopening 48 in the mountingplatform 28. Anut 49 threaded onto the threadedportion 47 of the housing 46 of thecontrol valve 45 secures thecontrol valve 45 in the mountingplatform 28, and in turn secures thecontroller housing 44 of thefuel gas controller 17 in the mountingplatform 28. Theopening 48 in the mountingplatform 28 is located so that thefuel gas controller 17 is located with a longitudinally extending central axis of thefuel gas controller 17 substantially coinciding with the secondarycentral axis 36 of thevalve accommodating location 35. Thereby thefuel gas controller 17 is centrally located in thevalve accommodating location 35. - With the
fuel gas controller 17 so mounted on the mountingplatform 28 and extending downwardly into thevalve accommodating location 35, thefuel gas controller 17 is located in the hollowinterior region 12 of thesupport element 10 spaced apart from and to one side of thefuel gas canister 3. - The
control valve 45 is operable between a closed state with the fuel gas from thefuel gas canister 3 isolated from the fuelgas burner element 18, and a fully open state with fuel gas from thefuel gas canister 3 supplied to the fuelgas burner element 18. Additionally, thecontrol valve 45 is operable in a plurality of intermediate open states between the closed state and the fully open state for controlling the flow rate of fuel gas from thefuel gas canister 3 to the fuelgas burner element 18. A manuallyoperable lever 50 extending radially from thecontrol valve 45 is operable through an arc in the direction of the arrows A and B for operating thecontrol valve 45 between the closed state and the fully open state. - An
outlet port 51 from thecontrol valve 45 is located in the threadedportion 47 of the housing 46 and comprises anoutlet jet 57 which directs fuel gas directly upwardly therefrom to the fuelgas burner element 18 as will be described below. - The
pipe 42 is coupled to the fuelgas inlet port 43 of thecontroller housing 44 for delivering fuel gas through thecontroller housing 44 to thecontrol valve 45. An emergency shut-offvalve 52 is formed in thecontroller housing 44 between thecontrol valve 45 and the fuelgas inlet port 43 for isolating the fuelgas burner element 18 from thefuel gas canister 3 in the event of the heater 1 toppling over. The emergency shut-offvalve 52 comprises aball 53 located in avalve chamber 54 formed in thecontroller housing 44. Theball 53 is rollable in thevalve chamber 54 from an open state with theball 53 resting on an end wall 55 of thecontroller housing 44 while the gas powered heater 1 is in a normal upright operating state, to a shut-off state with theball 53 closing aninlet port 56 to thecontrol valve 45 from thevalve chamber 54 in the event of the gas powered heater 1 toppling over. In the open state of theball 53, theinlet port 56 to thecontrol valve 45 communicates with the fuelgas inlet port 43 through thevalve chamber 54. In the shut-off state of theball 53, theball 53 isolates theinlet port 56 to thecontrol valve 45 from the fuelgas inlet port 43. - A pair of spaced apart
pillars 58 extending upwardly from the mountingplatform 28 support acarrier platform 60 of stainless steel spaced apart above the mountingplatform 28.Nuts 61 on thepillars 58 secure thecarrier platform 60 to thepillars 58. In this embodiment of the invention thecarrier platform 60 is located at a level relative to the level of thetop wall 22 of thesupport element 10, so that top surfaces of thecarrier platform 60 and thetop wall 22 substantially define a common plane. - The fuel
gas burner element 18 comprises aburner housing 62 of circular transverse cross-section which is mounted on thecarrier platform 60 and extends upwardly therefrom. Theburner housing 62 defines a geometrical central axis, and is mounted on thecarrier platform 60 with its geometrical central axis substantially coinciding with the secondarycentral axis 36 of thevalve accommodating location 35, as will be described below. Anopening 63 in thecarrier platform 60 accommodates a threadedspigot 64 extending downwardly from theburner housing 62. Anut 65 on the threadedspigot 64 clamps and secures theburner housing 62 on thecarrier platform 60. Aninlet port 66 extends through thespigot 64 into aburner chamber 68 of theburner housing 62 for accommodating fuel gas from theoutlet jet 57 in theoutlet port 51 of thecontrol valve 45 to theburner chamber 68. Theopening 63 in thecarrier platform 60 defines a geometrical central axis which substantially coincides with the secondarycentral axis 36, so that theopening 63 is vertically aligned with theopening 48 in the mountingplatform 28, so that in turn the fuelgas burner element 18 is vertically aligned with and above thefuel gas controller 17, and theinlet port 66 is in turn vertically aligned with theoutlet jet 57 in theoutlet port 51 of thecontrol valve 45. Thus, the geometrical central axis of theburner housing 62 substantially coincides with the secondarycentral axis 36 of thevalve accommodating location 35. - The
burner housing 62 terminates in an upwardly facingopen mouth 70. The gascatalytic combustion element 20 is located in theburner chamber 68 adjacent theopen mouth 70. Adiffuser element 72 which is formed by aplanar plate member 73, seeFIG. 8 , is located in theburner chamber 68 below and upstream of thediffuser element 72, and is supported on a taperingportion 71 of theburner housing 62, seeFIG. 5 . Theplate member 73 of thediffuser element 72 is of substantially circular shape and defines the transverse cross-section of theburner chamber 68 adjacent theopen mouth 70. Thediffuser element 72 comprises upwardly extendingsupport members 74 located around the periphery thereof on which the gascatalytic combustion element 20 is supported. Acentral portion 75 of thediffuser plate member 73 is blank so that fuel gas impinging on the centralblank portion 75 from theinlet port 66 is diffused by the centralblank portion 75. A plurality ofperforations 76 extend through theplate member 73 of thediffuser element 72 around the centralblank portion 75 for accommodating fuel gas therethrough to the gascatalytic combustion element 20. Additionally, a plurality ofrecesses 78 formed in the periphery of theplate member 73 between thesupport members 74 also accommodate fuel gas which has been diffused by the centralblank portion 75 to the gascatalytic combustion element 20. - The gas
catalytic combustion element 20 is of circular shape substantially defining the transverse cross-section of theburner chamber 68 adjacent theopen mouth 70, and comprises a ceramics based element coated with a precious metal. A plurality ofperforations 80 extend through the gascatalytic combustion element 20 for accommodating fuel gas therethrough, seeFIGS. 6 and 7 . The gascatalytic combustion element 20 is adapted to convert fuel gas to heat, and at the same time permit slippage of fuel gas through theperforations 80, so that some of the fuel gas burns with a flame downstream of the gas catalytic combustion element in theopen mouth 70 of theburner housing 62. - The
carrier platform 60 is spaced apart above the mountingplatform 28, so that anannular gap 82 is formed extending around theoutlet port 51 of thecontrol valve 45 and theinlet port 66 to the fuelgas burner element 18 in order to form a venturi mixer through which air is drawn into and mixed with the fuel gas stream issuing from theoutlet jet 57 in theoutlet port 51 of thecontrol valve 45 and delivered as a fuel gas/air mixture into theinlet port 66 of the fuelgas burner element 18. - In this embodiment of the invention the mounting
platform 28 is located at a level spaced apart a distance L of approximately 10 mm below the level of thetop wall 22 of thesupport element 10 adjacent the location at which the coupling element 15 is located in thetop wall 22, seeFIG. 2 . By locating the mountingplatform 28 at the level spaced apart the distance L of 10 mm below the level of thetop wall 22, the headroom required by the fuelgas burner element 18 is minimised, thereby minimising the overall headroom required by the gas powered heater 1. - In use, a suitable proprietary disposable
fuel gas canister 3 is coupled to thesupport element 10 by entering thefuel gas canister 3 through the downwardly facingopen mouth 14, and with thefuel gas canister 3 located in thecanister accommodating location 33 engaging theconnector 8 of thefuel gas canister 3 with the coupling element 15 of thesupport element 10. With a lower portion of thefuel gas canister 3 extending downwardly through theopen mouth 14 and acting as a stand for the gas powered heater 1, the gas powered heater 1 is ready for use. When it is desired to use the gas powered heater 1, thelever 50 is operated for operating thecontrol valve 45 from the closed state to the fully open state, and fuel gas is delivered from thefuel gas canister 3 to the fuelgas burner element 18. The fuel gas/air mixture exiting through the gascatalytic combustion element 20 is ignited by a flame or other suitable means, for example, a spark or the like, to commence burning in a flame. The root of the flame in turn heats the gascatalytic combustion element 20 to its ignition temperature, which in turn commences to convert fuel gas/air mixture to heat by catalytic reaction. However, the gascatalytic combustion element 20 allows slippage of the fuel gas/air mixture therethrough, so that some of the fuel gas/air mixture continues to burn in a flame downstream of the gascatalytic combustion element 20, in other words, above the gascatalytic combustion element 20. The gas powered heater 1 is then placed on a heater shelf of a chafing trolley or unit to maintain cooked food at an elevated temperature. The heat output of the gas powered heater 1 is varied by controlling the rate of flow of the fuel gas through thecontrol valve 45 by appropriately setting thelever 50 at an appropriate position between the closed state and the fully open state of thecontrol valve 45. - When the fuel gas powered heater 1 is no longer required, the
lever 50 is operated for operating thecontrol valve 45 into the closed state. - On the
fuel gas canister 3 becoming exhausted, thefuel gas canister 3 is disengaged from thesupport element 10 by disengaging theconnector 8 of thefuel gas canister 3 from the coupling element 15. Thereafter, a newfuel gas canister 3 is connected to the support element by connecting theconnector 8 of the newfuel gas canister 3 into the coupling element 15 with thefuel gas canister 3 located in thecanister accommodating location 33. - By virtue of the fact that the
fuel gas controller 17 is located to one side of and spaced apart from thefuel gas canister 3, the overall height of the gas powered heater element 1 is minimised, and thus, the headroom required by the gas powered heater 1 is likewise minimised. - In this embodiment of the invention the
support element 10 is adapted for use with a proprietary disposable cylindricalfuel gas canister 3 of total height h of approximately 64 mm, and diameter d of approximately 90 mm. With thefuel gas canister 3 coupled to the coupling element 15 of thesupport element 10, the overall height Hof the gas powered heater from the base 4 of thefuel gas canister 3 to a topperipheral edge 83 of theburner housing 62 is approximately 86 mm. A gas powered heater of such a height as the height H of 86 mm approximately can be accommodated within the headroom available in most chafing trolleys and units. - Typically, the spacing between the heater shelf of typical chafing trolleys and chafing units and the water tray above the heater element is in the range of 105 mm to 130 mm, thus providing a clearance of between 20 mm and 45 mm between the top
peripheral edge 83 of the fuelgas burner element 18 and the underside of the water tray when the gas powered heater 1 with thefuel gas canister 3 assembled thereto is located on the heater shelf of such chafing trolleys and units. Accordingly, the gas powered heater according to the present invention is suitable for use with such chafing trolleys and units. - Referring now to
FIG. 9 , there is illustrated a gas powered heater according to another embodiment of the invention, indicated generally by thereference numeral 90, which is also suitable for use with a chafing trolley or a chafing unit. The gas poweredheater 90 is substantially similar to the gas powered heater 1 described with reference toFIGS. 1 to 8 , and similar components are identified by the same reference numerals. The only difference between the gas poweredheater 90 and the gas powered heater 1 is in the depth of theside wall 23 of thesupport element 10. In this embodiment of the invention theside wall 23 is of overall height such that theside wall 23 extends downwardly and terminates in alower engagement portion 91 which is adapted to engage the heater shelf of the chafing trolley or chafing unit and thus act as a stand for thesupport element 10. In this embodiment of the invention thefuel gas canister 3 is located entirely within the hollowinterior region 12 defined by thesupport element 10 and does not engage the heater shelf of the chafing trolley or chafing unit. Otherwise, the gas poweredheater 90 and its use is similar to the gas powered heater 1. - Referring to
FIG. 10 , there is illustrated a gas powered heater according to a further embodiment of the invention, indicated generally by the reference numeral 95, which is also suitable for use with a chafing trolley or a chafing unit. The gas powered heater 95 is substantially similar to the gas powered heater 1 described with reference toFIGS. 1 to 8 , and similar components are identified by the same reference numerals. The only difference between the gas powered heater 95 and the gas powered heater 1 is that thecarrier platform 60 is located at a level slightly above the level of thetop wall 22 of thesupport element 10. The top surface of thecarrier platform 60 is at a level above the level of the top surface of thetop wall 22 of thesupport element 10 which corresponds to the thickness of the stainless steel sheet material of thecarrier platform 60, which in this embodiment of the invention is approximately 0.5 mm. Accordingly, in this embodiment of the invention the height of thecarrier platform 60 above the mountingplatform 28 is approximately 10.5 mm. - Otherwise, the gas powered heater 95 according to this embodiment of the invention is similar to the gas powered heater 1 described with reference to
FIGS. 1 to 8 , as is its use likewise similar to the use of the gas powered heater 1 described with reference toFIGS. 1 to 8 . - While the gas powered heaters according to the invention have been described as comprising a support element of a particular material, the support element may be of any other suitable material, whether a metal material, a plastics material or otherwise. Additionally, it is envisaged that while it is desirable, it is not necessary that the support element need be dish-shaped. In certain cases, it is envisaged that the side wall of the support element may be omitted.
- While the gas powered heaters have been described for use in a chafing trolley or a chafing unit, it will be appreciated that the gas powered heaters may be used in many other applications both in the catering and hospitality industries and in other industries, and it will also be appreciated that the gas powered heaters may be used as a standalone heater or stove.
- While the gas powered heaters according to the invention have been described for use with a disposable cylindrical gas canister of total height of approximately 64 mm and diameter of approximately 90 mm, it is envisaged that the gas powered heaters may be adapted for use with disposable gas canisters of total height and diameter other than 64 mm in height and 90 mm in diameter. Indeed, it is envisaged that the gas powered heaters may be adapted for use with disposable cylindrical fuel gas canisters of diameter up to 100 mm, and total height of up to 70 mm. Indeed, it will be appreciated that while the gas powered heaters have been described as being adapted for use with a disposable cylindrical fuel gas canister, the gas powered heaters could be adapted for use with disposable fuel gas canisters of other shapes besides cylindrical, for example, square, polygonal, for example, hexagonal, octagonal or any other suitable or desirable shapes.
- It will also be appreciated that while the gas powered heaters according to the invention have been described as having an overall height of approximately 83 mm, it is envisaged that the gas powered heaters according to the invention when coupled to a disposable fuel gas canister could be provided with a total overall height in the range of 50 mm to 150 mm, but in general, it is envisaged that the overall height of the gas powered heaters including the disposable fuel gas canister would not exceed 100 mm.
- Additionally, it is envisaged that while the vertical spacing between the level of the mounting
platform 28 and the level of thetop wall 22 of thesupport element 10 has been described as being approximately 10 mm, it is envisaged that the vertical spacing between the levels of the mountingplatform 28 and thetop wall 22 could be as high as 20 mm, where the mountingplatform 28 would be located at alevel 20 mm below the level of thetop wall 22 of thesupport element 10. It is also envisaged that in certain cases, the mounting platform may be spaced at a level below the level of thetop wall 22 of thesupport element 10 of as little as 5 mm. - It is also envisaged that the gas catalytic combustion element, instead of being a ceramics based gas catalytic combustion element, may comprise a wire mesh gas catalytic combustion element, or a fibre based gas catalytic combustion element, in which case, the wires or the fibres, as the case may be, would be coated with an appropriate precious metal.
- While the fuel gas burner element has been described as comprising a burner housing of circular transverse cross-section, the transverse cross-section of the burner housing of the fuel gas burner element may be of any desired cross-section.
Claims (21)
1-53. (canceled)
54. A gas powered heater comprising a support element defining a hollow interior region and a downwardly facing open mouth providing access to the hollow interior region, the hollow interior region defining a canister accommodating location for accommodating a pressurised fuel gas canister therein in a substantially generally upright orientation, a coupling element located in the canister accommodating location of the hollow interior region secured to an upper portion of the support element, the coupling element being releasably engageable with an outlet port of a fuel gas canister for coupling the fuel gas canister to the support element in the canister accommodating location, a mounting platform formed in the support element, a fuel gas controller mounted on the mounting platform and extending downwardly therefrom into a valve accommodating location in the hollow interior region offset to one side of the canister accommodating location, the fuel gas controller being in communication with the coupling element through a fuel gas path for receiving fuel gas from the fuel gas canister through the coupling element, and a fuel gas burner element located externally of the support element above and substantially centrally aligned with the fuel gas controller, the fuel gas burner element communicating with the fuel gas controller for receiving fuel gas therefrom.
55. A gas powered heater as claimed in claim 54 in which the support element comprises a top wall, and the coupling element is mounted on the top wall and extends downwardly into the canister accommodating location therefrom, and advantageously, the mounting platform is located at a level below the level of a portion of the top wall of the support element to which the coupling element is mounted, and preferably, the mounting platform is located at a level of at least 5 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted, and advantageously, the mounting platform is located at a level of at least 7.5 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted, and preferably, the mounting platform is located at a level of at least 10 mm below the level of the portion of the top wall of the support element to which the coupling element is mounted.
56. A gas powered heater as claimed in claim 54 in which the mounting platform is spaced apart laterally from the coupling element, and advantageously, the canister accommodating location defines a longitudinally extending main central axis which in use extends substantially vertically, and preferably, the canister accommodating location is adapted for accommodating a fuel gas canister with a vertically extending central geometrical axis of the fuel gas canister substantially coinciding with the main central axis of the canister accommodating location, and advantageously, the valve accommodating location defines a longitudinally extending secondary central axis extending substantially parallel to the main central axis, and preferably, the fuel gas controller is located in the valve accommodating location with a longitudinally extending central axis of the fuel gas controller substantially coinciding with the secondary central axis of the valve accommodating location.
57. A gas powered heater as claimed in claim 56 in which the support element comprises a side wall extending around the hollow interior region, and preferably, the side wall defines the downwardly facing open mouth.
58. A gas powered heater as claimed in claim 57 in which the support element comprises an inclined wall extending around the top wall and inclining in a generally downwardly outwardly direction from the top wall, and preferably, a portion of the inclined wall terminates in the side wall of the support element.
59. A gas powered heater as claimed in claim 58 in which the inclined wall terminates in the mounting platform.
60. A gas powered heater as claimed in claim 57 in which a first portion of the side wall of the support element defines a portion of the canister accommodating location, and preferably, the first portion of the side wall of the support element defines at least 180° of the canister accommodating location, and advantageously, the first portion of the side wall is of part cylindrical shape defining the main central axis of the canister accommodating location.
61. A gas powered heater as claimed in claim 60 in which a second portion of the side wall of the support element defines a portion of the valve accommodating location, and preferably, the second portion of the side wall is of part cylindrical shape defining the secondary central axis of the valve accommodating location, and advantageously, the second portion of the side wall of the support element extends downwardly from the mounting platform, and preferably, a pair of spaced apart tangential side walls join the first and second cylindrical portions of the side wall.
62. A gas powered heater as claimed in claim 54 in which a carrier platform is mounted on the support element spaced apart above the mounting platform, and the fuel gas burner element is mounted on the carrier platform, and preferably, at least one pillar extending upwardly from the mounting platform supports the carrier platform above the mounting platform, and advantageously, the fuel gas burner element is mounted on the carrier platform with an inlet port thereof facing downwardly and being aligned with an upwardly facing outlet port of the fuel gas controller extending from the mounting platform for receiving fuel gas from the fuel gas controller, and preferably, the inlet port to the fuel gas burner is spaced apart above the outlet port from the fuel gas controller to define an annular gap therebetween to in turn form a venturi mixer for mixing fuel gas being delivered to the fuel gas burner with air, and advantageously, the outlet port of the fuel gas controller comprises an outlet jet through which fuel gas is delivered from the outlet port.
63. A gas powered heater as claimed in claim 54 in which the fuel gas burner element and the fuel gas controller are in substantial vertical alignment with each other, and preferably, the fuel gas controller comprises a fuel gas control valve operable between a closed state isolating the fuel gas burner from the fuel gas supply, and a fully open state for delivering fuel gas to the fuel gas burner, and preferably, the fuel gas control valve is operable in a plurality of open states between the closed state and the fully open state for controlling the rate at which fuel gas is supplied to the fuel gas burner, and advantageously, a control lever is operably coupled to the fuel gas control valve for facilitating manual operation of the fuel gas control valve between the closed state and the fully open state.
64. A gas powered heater as claimed in claim 54 in which the fuel gas burner element comprises a housing having a gas catalytic combustion element located therein for converting fuel gas to heat by a catalytic reaction, and preferably, the gas catalytic combustion element is adapted to permit slippage of fuel gas therethrough, so that the fuel gas is burnt in a flame downstream of the catalytic combustion element, and advantageously, the housing of the burner element defines an upwardly facing open mouth, and the gas catalytic combustion element is located in the housing adjacent the open mouth thereof, and preferably, a diffuser element is located in the housing of the fuel gas burner element upstream of the catalytic combustion element, and downstream of the inlet port of the fuel gas burner element.
65. A gas powered heater as claimed in claim 64 in which the diffuser element is spaced apart from the gas catalytic combustion element.
66. A gas powered heater as claimed in claim 64 in which the gas catalytic combustion element is spaced apart above the diffuser element.
67. A gas powered heater as claimed in claim 64 in which the diffuser element comprises a central blank portion on which fuel gas from the inlet port of the fuel gas burner element impinges.
68. A gas powered heater as claimed in claim 67 in which a plurality of perforations extend through the diffuser element offset from the central blank portion for accommodating fuel gas therethrough to the catalytic combustion element, and preferably, the perforations extending through the diffuser element are located at spaced apart intervals around the central blank portion thereof.
69. A gas powered heater as claimed in claim 64 in which the diffuser element comprises a planar plate member, and preferably, the planar plate member of the diffuser element substantially defines the cross-section of the housing of the fuel gas burner element.
70. A gas powered heater as claimed in claim 54 in which the support element is adapted to accommodate a fuel gas canister in the fuel gas accommodating location with a portion of the fuel gas canister extending downwardly from the canister accommodating location through the downwardly facing open mouth, so that the fuel gas canister acts as a stand for the gas powered heater, and preferably, the depth of the side wall of the support element is such that a standard fuel gas canister extends downwardly from the canister accommodating location through the downwardly facing open mouth of the support element.
71. A gas powered heater as claimed in claim 54 in which the support element is adapted to accommodate a fuel gas canister in the canister accommodating location with the fuel gas canister located entirely within the support element.
72. A gas powered heater as claimed in claim 54 in which a fuel gas canister of pressurised fuel gas in liquid form is located in the canister accommodating location coupled to the support element by the coupling element, and preferably, the fuel gas canister comprises a disposable pressurised fuel gas canister.
73. A gas powered heater as claimed in claim 72 in which the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height in the range of 50 mm to 150 mm, and preferably, the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height which does not exceed 100 mm, and advantageously, the gas powered heater with the fuel gas canister located in the canister accommodating location of the support element and coupled thereto by the coupling element is of overall height of approximately 83 mm, and advantageously, the support element is adapted to accommodate a pressurised fuel gas canister of diameter not more than 100 mm and of overall height not more than 70 mm, and preferably, the support element is adapted for receiving a pressurised fuel gas canister of diameter of approximately 90 mm and of overall height of approximately 64 mm.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES20110490 | 2011-11-14 | ||
IES2011/0490 | 2011-11-14 | ||
PCT/IE2012/000050 WO2013072905A2 (en) | 2011-11-14 | 2012-11-14 | A gas powered heater |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140338660A1 true US20140338660A1 (en) | 2014-11-20 |
Family
ID=48430289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/357,947 Abandoned US20140338660A1 (en) | 2011-11-14 | 2012-11-14 | Gas powered heater |
Country Status (3)
Country | Link |
---|---|
US (1) | US20140338660A1 (en) |
EP (1) | EP2780633A2 (en) |
WO (1) | WO2013072905A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140342295A1 (en) * | 2011-07-27 | 2014-11-20 | Dermot Walsh | Stove |
US20160018106A1 (en) * | 2014-07-15 | 2016-01-21 | Pro-Iroda Industries, Inc. | Gas Device with Increased Fuel Evaporation Efficiency |
US20160084505A1 (en) * | 2014-09-18 | 2016-03-24 | Pro-Iroda Industries, I,nc. | Gas Burner with Tilt Safety Assembly |
Families Citing this family (2)
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FR3007106B1 (en) * | 2013-06-17 | 2015-05-29 | Applic Gaz Sa | FLUID COMMUNICATION DEVICE |
CN104172907B (en) * | 2014-09-09 | 2017-05-24 | 陆一铭 | Time-delay shutoff valve of electric pressure cooker |
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US20160018106A1 (en) * | 2014-07-15 | 2016-01-21 | Pro-Iroda Industries, Inc. | Gas Device with Increased Fuel Evaporation Efficiency |
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Also Published As
Publication number | Publication date |
---|---|
WO2013072905A3 (en) | 2014-01-30 |
WO2013072905A2 (en) | 2013-05-23 |
EP2780633A2 (en) | 2014-09-24 |
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