EP3598021A2 - Liquid fuel air heater - Google Patents
Liquid fuel air heater Download PDFInfo
- Publication number
- EP3598021A2 EP3598021A2 EP19172598.5A EP19172598A EP3598021A2 EP 3598021 A2 EP3598021 A2 EP 3598021A2 EP 19172598 A EP19172598 A EP 19172598A EP 3598021 A2 EP3598021 A2 EP 3598021A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid fuel
- combustion chamber
- motor
- temperature
- control valve
- 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.)
- Withdrawn
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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
- F23D14/28—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
- 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
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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
- F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
- F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
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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
- F23D14/38—Torches, e.g. for brazing or heating
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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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/465—Details, e.g. noise reduction means for torches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/087—Regulating air supply or draught by power-assisted systems using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0488—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2085—Arrangement or mounting of control or safety devices for air heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/04—Preheating liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/16—Measuring temperature burner temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/10—Sequential burner running
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/02—Space-heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
- F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns
Definitions
- the present invention relates to air heaters, and more particularly to liquid fuel air heaters.
- Air heaters may use liquid fuel for combustion to create a heated airflow for discharge into the environment.
- the liquid fuel may be provided from a liquid fuel container on board the air heater.
- a liquid fuel air heater comprising a housing defining a motor housing portion and a grip portion extending from the motor housing portion, an electric motor positioned in the motor housing portion, a combustion chamber at least partially positioned within the motor housing portion, a fan driven by the motor when activated for generating an axial airflow through the combustion chamber and a battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement, the battery pack being removably coupled to the grip portion of the housing for supplying power to the motor.
- the liquid fuel air heater may further comprise a liquid fuel container for providing liquid fuel to the combustion chamber.
- the liquid fuel air heater may further comprise a heating blanket in thermal contact with and at least partially surrounding the liquid fuel container.
- the heating blanket when activated, may increase a temperature of the liquid fuel container.
- the present invention provides, in another aspect, a liquid fuel air heater comprising a housing defining a motor housing portion, an electric motor positioned in the motor housing portion, a combustion chamber at least partially positioned within the motor housing portion, a fan driven by the motor when activated for generating an axial airflow through the combustion chamber, a liquid fuel container at least partially positioned in the housing for providing liquid fuel to the combustion chamber, and a heating blanket in thermal contact with and at least partially surrounding the liquid fuel container.
- the heating blanket when activated, increases the temperature of the liquid fuel container.
- the housing may define a grip portion extending from the motor housing portion.
- the liquid fuel air heater may further comprise a battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement.
- the battery pack may be removably coupled to the grip portion of the housing for supplying power to the motor.
- the heating blanket may be activated when the temperature of the liquid fuel container falls below a threshold temperature.
- the liquid fuel air heater may further comprise a control valve to alternatively permit or prevent the flow of liquid fuel from the liquid fuel container to the combustion chamber;
- the control valve may be a solenoid actuated valve.
- the liquid fuel air heater may further comprise an ignitor configured to ignite liquid fuel in the combustion chamber.
- the liquid fuel air heater may further comprise an actuator moveable between a first position in which the motor is off and the control valve is closed and a second position.
- the actuator may be biased to the first position.
- the control valve When the actuator is in the second position for a first predetermined period of time, the control valve may be opened, the ignitor may create sparks to ignite liquid fuel in the combustion chamber, and the motor may be activated.
- control valve After the control valve is opened, if a temperature of the combustion chamber is below a threshold temperature for a second predetermined period of time, the control valve may be closed.
- control valve After the control valve is opened, if a temperature of the combustion chamber is greater than or equal to a threshold temperature for a second predetermined period of time, the control valve may be kept open.
- the liquid fuel air heater may further comprise a thermocouple configured to produce a voltage that is proportional to the temperature of the combustion chamber and provided as an input to a controller. After the control valve is opened if the temperature of the combustion chamber is greater than or equal to the threshold temperature for the predetermined period of time, the controller may keep the control valve open in response to receiving the input.
- the present invention provides, in yet another aspect, a method of operating a liquid fuel air heater comprising moving an actuator from a first position to a second position a first instance, initiating a first timer in response to the actuator reaching the second position, following expiration of the first timer, detecting whether the actuator is in the first position or the second position, following detection of the actuator in the second position, opening a control valve to direct liquid fuel from an onboard liquid fuel container into (or toward) a combustion chamber, directing an electrical current to an ignitor in the combustion chamber to ignite the fuel in the combustion chamber, and activating a motor to drive a fan for generating an axial airflow through the combustion chamber, which is heated by the combusting fuel and discharged from the combustion chamber.
- the method may further comprise:
- the method may further comprise:
- the method may further comprise:
- the method may further comprise:
- the method may further comprise:
- the method may further comprise:
- FIGS. 1-3 illustrate an air heater10 according to an embodiment of the invention.
- the air heater 10 includes a housing 14, a liquid fuel container 16, a combustion chamber 18, and a heat outlet 20 for directing a heated airflow towards a target.
- the housing 14 defines a motor housing portion 22, which houses the combustion chamber 18 and a motor 24 to drive a fan 26 that is arranged on an opposite side of the combustion chamber 18 as the heat outlet 20, and a grip portion 30 extending from the motor housing portion 22 that is graspable by an operator while the air heater 10 is in use.
- the liquid fuel container 16 contains a reservoir of liquid butane, but in other embodiments, the liquid fuel container may contain other combustible liquids.
- a battery pack 32 is removably coupled to the grip portion 30 to provide power to the motor 24 and the other components of the air heater 10 requiring electrical power.
- the battery pack 32 is an 18 V battery pack but may alternatively include any of a number of different nominal voltages (e.g., 12 V, 24 V, etc.), and may be configured having any of a number of different chemistries (e.g., lithium-ion, nickel-cadmium, etc.).
- the battery pack 32 contains a plurality of battery cells connected to each other in a series or parallel arrangement.
- the grip portion 30 is a pistol-grip handle but in other embodiments the grip portion 30 can have other shapes and orientations.
- the air heater 10 includes an actuator, such as a trigger 34, located in the grip portion 30 and biased to a first, extended, position by a torsion spring 38 ( FIG. 2 ).
- the trigger 34 is configured to actuate a switch 40, which provides an input to a controller governing operation of the air heater 10.
- the controller is configured as a microcontroller unit (“MCU") 42 provided on a printed circuit board assembly 44.
- MCU microcontroller unit
- the air heater 10 also includes an LED 46 to provide indications to the operator, via different lighted colors or blinking patterns, coinciding with different stages of operation, as explained in further detail below.
- the liquid fuel container 16 has a release valve 48, which is in fluid communication with an inlet of a metering valve 54 via a conduit 50.
- the metering valve 54 is adjustable using an adjustment knob 58 ( FIG. 1 ) to control the flow rate of liquid fuel exiting the metering valve 54.
- the metering valve 54 is a needle valve but in other embodiments, other valve types may be used. As such, by adjusting the flow rate of liquid fuel that is ultimately delivered to the combustion chamber 18, the temperature of the heated airflow discharged from the outlet 20 can be adjusted.
- the air heater 10 also includes a control valve 62 having an inlet in fluid communication with an outlet of the metering valve 54 via a conduit 60.
- An outlet of the control valve 62 is in fluid communication with the combustion chamber 18 via a conduit 64.
- the control valve 62 is a solenoid-actuated valve 62 that is electrically connected with the MCU 42.
- the MCU 42 is capable of switching the valve 62 between an open state in which the flow of liquid fuel from the liquid fuel container 16 to the combustion chamber 18 is permitted, and a closed state, in which the liquid fuel is prevented from being discharged into the combustion chamber 18.
- the valve 62 is biased into the closed state, such that without an electrical input from the MCU 42, the valve 62 will remain closed and liquid fuel from the container 16 is prevented from being discharged into the combustion chamber 18.
- the air heater 10 includes an ignitor 66 located at least partially within the combustion chamber 18 and that is electrically connected with the MCU 42.
- the combustion chamber 18 includes an orifice 68 in which the liquid fuel from the conduit 64 enters to be ignited by the igniter 66.
- a thermocouple 70 is located proximate or within the combustion chamber 18 and is also electrically connected with the MCU 42 via an amplifier 74.
- a temperature sensor 78 is arranged proximate the liquid fuel container 16 to monitor the temperature of the liquid fuel container 16.
- a heating blanket 82 is wrapped around and is in thermal contact with the liquid fuel container 16 (see also FIG. 2 ).
- the heating blanket 82 is also electrically connected with the MCU 42. As discussed in further detail below, when the heating blanket 82 is activated by the MCU 42, it increases the temperature of the liquid fuel container 16, and therefore the pressure of the compressed gas inside the container 16 expelling the liquid fuel therefrom.
- FIG. 4 is a flowchart illustrating a method of operating the air heater 10.
- the control valve 62 is initially in its closed state blocking the flow of liquid fuel from the container 16 to the combustion chamber 18.
- the motor 24 is also deactivated, such that the fan 26 is not running, and no current is flowing to the ignitor 66.
- the LED 46 indicates to the operator that the air heater 10 is "ready for use.”
- the switch 40 is closed, thereby providing an electrical signal (i.e., a voltage input) to the MCU 42.
- the MCU 42 Upon detecting this trigger actuation signal, the MCU 42 initiates a first timer, which will run for a first predetermined period of time, as shown at step 94.
- the LED 46 indicates to the operator that the air heater 10 is "warming up.”
- the MCU checks to determine whether the trigger 34 is still depressed and switch 40 is still closed upon expiration of the first timer. If the trigger 34 is not still depressed, the control valve 62 remains closed, the motor 24 remains deactivated, and no current flows to ignitor 66. If however, the trigger 34 is still depressed, the MCU 42 energizes the control valve 62 to direct liquid fuel into the combustion chamber 18 and (for a limited time) directs an electrical current to the ignitor 66, creating repeated sparks to ignite the discharged liquid fuel at the orifice 68 in the combustion chamber 18, as shown at step 102. This ensures that a brief accidental or inadvertent depression of the trigger 34 will not initiate operation of the air heater 10.
- the liquid fuel is preheated prior to combustion at the orifice 68. Specifically, prior to entering the orifice 68, the liquid fuel is heated by the flame in the combustion chamber 18 to a threshold temperature at which the liquid fuel is vaporized into a gaseous fuel state. The gaseous fuel then enters the orifice 68 for combustion by the ignitor 66. Thus, in these embodiments, liquid fuel is prevented from entering the orifice 68. Rather the fuel only enters the orifice 68 in a gaseous state.
- the MCU 42 Concurrently with or shortly after the MCU 42 directs an electrical current through the ignitor 66, the MCU 42 also activates the motor 24 to rotate the fan 26 as shown at step 102.
- the fan 26 generates an axial airflow through the combustion chamber 18, which is heated by the combusting liquid fuel. The heated airflow is then discharged from the heat outlet 20.
- the LED 46 indicates to the operator that the air heater 10 is "on", thus signaling to the operator that the trigger 34 may be released.
- the operator may release trigger 34 while the control valve 62 remains open and motor 24 continues to drive fan 26.
- an operator may release the trigger 34 while liquid fuel continues to flow to the combustion chamber 18 to continue the heating operation, rather than needing to continually hold the trigger 34 depressed.
- thermocouple 70 produces a voltage that is proportional to the temperature in the combustion chamber 18 using the thermoelectric or "Seebeck" effect.
- the amplifier 74 amplifies the voltage output by the thermocouple 70, and the amplified voltage is provided to the MCU 42 as a voltage input proportional to the temperature in the combustion chamber 18. Because the thermocouple 70 is at an ambient temperature prior to operation of the air heater 10, after expiration of the first timer, the MCU 42 initiates a second timer, as shown at step 110.
- the second timer will run for a second predetermined period of time while the control valve 62 will remain energized (and therefore in its open state) and the motor 24 will remain activated to rotate the fan 26, regardless of the temperature detected by the thermocouple 70, and regardless of whether the trigger 34 remains held in its depressed position or is released. As shown at step 114, the thermocouple continues to produce voltage proportional to the temperature in the combustion chamber 18, thereby "detecting" the temperature of the combustion chamber 18.
- the MCU determines whether the temperature in the combustion chamber 18 is greater than or equal to a threshold temperature as detected by the thermocouple 70. If the temperature in the combustion chamber 18 is greater than or equal to the threshold temperature the MCU 42 will maintain the control valve 62 in its open state and continue to drive the motor 24 and fan 26, as shown at step 122.
- the MCU 42 will de-energize the control valve 62 (thereby switching it from the open state to the closed state) and deactivate the motor 24, as shown at step 126.
- the control valve 62 will close and discontinue the flow of liquid fuel to the combustion chamber 18.
- the LED 46 indicates to the operator that ignition failed, thus signaling to the operator that the process for starting the air heater 10 must be re-initiated at step 90.
- the temperature of the combustion chamber 18 continues to be detected at step 130 via the thermocouple 70 and amplifier 74 as described above.
- the MCU 42 continuously determines whether the temperature of the combustion chamber 18 detected at step 130 is greater than or equal to the threshold temperature. If the temperature in the combustion chamber 18 is greater than or equal to the threshold temperature, the process run by the MCU 42 simply returns to step 130 and continues cycling between steps 130 and 134 for as long as the temperature of the combustion chamber 18 is equal to or above the threshold temperature.
- the MCU 42 will de-energize the control valve 62 (thereby switching it from the open state to the closed state) and initiate a third timer while the motor 24 continues to drive the fan 26, as shown at step 138.
- the LED 46 indicates to the operator that a flame out has occurred.
- the motor 24 While the third timer is running, the motor 24 continues to drive the fan 26 during a "cool down” period, during which the LED indicates to the operator that the air heater 10 is going through a "cool down.” Upon expiration of third timer the motor 24 is deactivated and thus the fan 26 stops running, as shown at step 142.
- the third timer is 30 seconds but in other embodiments, the third timer is longer or shorter than 30 seconds.
- the operator may simply depress the trigger 34 a second instance to actuate the switch 40 again, prompting the MCU 42 to close the control valve 62 and initiate the third timer while the motor 24 continues to drive the fan 26 for the "cool down" process, as shown at step 138.
- the temperature sensor 78 continuously monitors the temperature of the liquid fuel container 16 ( FIG. 3 ). If the temperature of the liquid fuel container 16 drops below a threshold temperature, the temperature sensor 78 provides an electrical signal (e.g., a voltage input) to the MCU 42, which in turn activates the heating blanket 82 to raise and/or maintain the liquid fuel container 16 at a predetermined temperature, such as 35 degrees Celsius. Thus, the heating blanket 82 prevents the temperature of the liquid fuel container 16 from falling so low that the pressure in the liquid fuel container 16 is insufficient to provide a constant flow rate of liquid fuel from the container 16.
- a predetermined temperature such as 35 degrees Celsius
Abstract
Description
- The present invention relates to air heaters, and more particularly to liquid fuel air heaters.
- Air heaters may use liquid fuel for combustion to create a heated airflow for discharge into the environment. The liquid fuel may be provided from a liquid fuel container on board the air heater.
- The present invention provides, in one aspect, a liquid fuel air heater comprising a housing defining a motor housing portion and a grip portion extending from the motor housing portion, an electric motor positioned in the motor housing portion, a combustion chamber at least partially positioned within the motor housing portion, a fan driven by the motor when activated for generating an axial airflow through the combustion chamber and a battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement, the battery pack being removably coupled to the grip portion of the housing for supplying power to the motor.
- The liquid fuel air heater may further comprise a liquid fuel container for providing liquid fuel to the combustion chamber.
- The liquid fuel air heater may further comprise a heating blanket in thermal contact with and at least partially surrounding the liquid fuel container. The heating blanket, when activated, may increase a temperature of the liquid fuel container.
- The present invention provides, in another aspect, a liquid fuel air heater comprising a housing defining a motor housing portion, an electric motor positioned in the motor housing portion, a combustion chamber at least partially positioned within the motor housing portion, a fan driven by the motor when activated for generating an axial airflow through the combustion chamber, a liquid fuel container at least partially positioned in the housing for providing liquid fuel to the combustion chamber, and a heating blanket in thermal contact with and at least partially surrounding the liquid fuel container. The heating blanket, when activated, increases the temperature of the liquid fuel container.
- The housing may define a grip portion extending from the motor housing portion.
- The liquid fuel air heater may further comprise a battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement. The battery pack may be removably coupled to the grip portion of the housing for supplying power to the motor.
- The heating blanket may be activated when the temperature of the liquid fuel container falls below a threshold temperature.
- The liquid fuel air heater may further comprise a control valve to alternatively permit or prevent the flow of liquid fuel from the liquid fuel container to the combustion chamber;
- The control valve may be a solenoid actuated valve.
- The liquid fuel air heater may further comprise an ignitor configured to ignite liquid fuel in the combustion chamber.
- The liquid fuel air heater may further comprise an actuator moveable between a first position in which the motor is off and the control valve is closed and a second position. The actuator may be biased to the first position. When the actuator is in the second position for a first predetermined period of time, the control valve may be opened, the ignitor may create sparks to ignite liquid fuel in the combustion chamber, and the motor may be activated.
- After the control valve is opened, if a temperature of the combustion chamber is below a threshold temperature for a second predetermined period of time, the control valve may be closed.
- After the control valve is opened, if a temperature of the combustion chamber is greater than or equal to a threshold temperature for a second predetermined period of time, the control valve may be kept open.
- The liquid fuel air heater may further comprise a thermocouple configured to produce a voltage that is proportional to the temperature of the combustion chamber and provided as an input to a controller. After the control valve is opened if the temperature of the combustion chamber is greater than or equal to the threshold temperature for the predetermined period of time, the controller may keep the control valve open in response to receiving the input.
- The present invention provides, in yet another aspect, a method of operating a liquid fuel air heater comprising moving an actuator from a first position to a second position a first instance, initiating a first timer in response to the actuator reaching the second position, following expiration of the first timer, detecting whether the actuator is in the first position or the second position, following detection of the actuator in the second position, opening a control valve to direct liquid fuel from an onboard liquid fuel container into (or toward) a combustion chamber, directing an electrical current to an ignitor in the combustion chamber to ignite the fuel in the combustion chamber, and activating a motor to drive a fan for generating an axial airflow through the combustion chamber, which is heated by the combusting fuel and discharged from the combustion chamber.
- The method may further comprise:
- initiating a second timer;
- following expiration of the second timer, detecting whether a temperature of combustion chamber is less than a threshold temperature;
- following detection of the combustion chamber temperature being less than the threshold temperature, closing the control valve; and
- deactivating the motor;
- The method may further comprise:
- initiating a second timer;
- following expiration of the second timer, detecting whether a temperature of combustion chamber is greater than or equal to a threshold temperature;
- following detection of the combustion chamber temperature being greater than or equal to the threshold temperature, maintaining the control valve in an open state; and
- maintaining activation of the motor.
- The method may further comprise:
- following maintaining the control valve in an open state and maintaining activation of the motor, detecting whether the temperature of combustion chamber is greater than or equal to the threshold temperature;
- following detection of the combustion chamber temperature being less than the threshold temperature, closing the control valve and initiating a third timer; and
- following expiration of the third timer, deactivating the motor.
- The method may further comprise:
- following maintaining the control valve in an open state and maintaining activation of the motor, detecting whether the temperature of combustion chamber is greater than or equal to the threshold temperature;
- following detection of the combustion chamber temperature being greater than or equal to the threshold temperature, maintaining the control valve in an open state; and
- maintaining activation of the motor.
- The method may further comprise:
- following activation of the motor, releasing the actuator and allowing the actuator to move from the second position to the first position;
- following release of the actuator, maintaining the control valve in an open state; and maintaining activation of the motor.
- The method may further comprise:
- moving the actuator from the first position to the second position a second instance;
- detecting that the actuator is in the second position;
- following detection of the actuator in the second position, closing the control valve; and
- deactivating the motor.
- Where appropriate, any of the optional features discussed above in relation to one aspect of the invention, may be applied to another aspect of the invention.
- Other features and aspects of the invention will become apparent by consideration of the following detailed description and accompanying drawings.
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-
FIG. 1 is a perspective view of a liquid fuel air heater. -
FIG. 2 is a plan view of the liquid fuel air heater ofFIG. 1 with portions removed. -
FIG. 3 is a schematic of the liquid fuel air heater ofFIG. 1 . -
FIG. 4 is a flowchart illustrating a method of operating the liquid fuel air heater ofFIG. 1 . - Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
-
FIGS. 1-3 illustrate an air heater10 according to an embodiment of the invention. Theair heater 10 includes ahousing 14, aliquid fuel container 16, acombustion chamber 18, and aheat outlet 20 for directing a heated airflow towards a target. Thehousing 14 defines amotor housing portion 22, which houses thecombustion chamber 18 and amotor 24 to drive afan 26 that is arranged on an opposite side of thecombustion chamber 18 as theheat outlet 20, and agrip portion 30 extending from themotor housing portion 22 that is graspable by an operator while theair heater 10 is in use. In the illustrated embodiment, theliquid fuel container 16 contains a reservoir of liquid butane, but in other embodiments, the liquid fuel container may contain other combustible liquids. - A
battery pack 32 is removably coupled to thegrip portion 30 to provide power to themotor 24 and the other components of theair heater 10 requiring electrical power. In the illustrated embodiment, thebattery pack 32 is an 18 V battery pack but may alternatively include any of a number of different nominal voltages (e.g., 12 V, 24 V, etc.), and may be configured having any of a number of different chemistries (e.g., lithium-ion, nickel-cadmium, etc.). Thebattery pack 32 contains a plurality of battery cells connected to each other in a series or parallel arrangement. - In the illustrated embodiment, the
grip portion 30 is a pistol-grip handle but in other embodiments thegrip portion 30 can have other shapes and orientations. Theair heater 10 includes an actuator, such as atrigger 34, located in thegrip portion 30 and biased to a first, extended, position by a torsion spring 38 (FIG. 2 ). When thetrigger 34 is depressed to a second, depressed, position against the biasing force of thetorsion spring 38, thetrigger 34 is configured to actuate aswitch 40, which provides an input to a controller governing operation of theair heater 10. In the illustrated embodiment of theair heater 10 as shown inFIG. 3 , the controller is configured as a microcontroller unit ("MCU") 42 provided on a printedcircuit board assembly 44. Theair heater 10 also includes anLED 46 to provide indications to the operator, via different lighted colors or blinking patterns, coinciding with different stages of operation, as explained in further detail below. - With reference to
FIG. 2 , theliquid fuel container 16 has arelease valve 48, which is in fluid communication with an inlet of ametering valve 54 via aconduit 50. Themetering valve 54 is adjustable using an adjustment knob 58 (FIG. 1 ) to control the flow rate of liquid fuel exiting themetering valve 54. In the illustrated embodiment, themetering valve 54 is a needle valve but in other embodiments, other valve types may be used. As such, by adjusting the flow rate of liquid fuel that is ultimately delivered to thecombustion chamber 18, the temperature of the heated airflow discharged from theoutlet 20 can be adjusted. - With continued reference to
FIG. 2 , theair heater 10 also includes acontrol valve 62 having an inlet in fluid communication with an outlet of themetering valve 54 via aconduit 60. An outlet of thecontrol valve 62 is in fluid communication with thecombustion chamber 18 via aconduit 64. In the illustrated embodiment of theair heater 10, thecontrol valve 62 is a solenoid-actuatedvalve 62 that is electrically connected with theMCU 42. TheMCU 42, in turn, is capable of switching thevalve 62 between an open state in which the flow of liquid fuel from theliquid fuel container 16 to thecombustion chamber 18 is permitted, and a closed state, in which the liquid fuel is prevented from being discharged into thecombustion chamber 18. Thevalve 62 is biased into the closed state, such that without an electrical input from theMCU 42, thevalve 62 will remain closed and liquid fuel from thecontainer 16 is prevented from being discharged into thecombustion chamber 18. - With reference to
FIG. 3 , theair heater 10 includes anignitor 66 located at least partially within thecombustion chamber 18 and that is electrically connected with theMCU 42. Thecombustion chamber 18 includes anorifice 68 in which the liquid fuel from theconduit 64 enters to be ignited by theigniter 66. Athermocouple 70 is located proximate or within thecombustion chamber 18 and is also electrically connected with theMCU 42 via anamplifier 74. - As shown in
FIG. 3 , atemperature sensor 78 is arranged proximate theliquid fuel container 16 to monitor the temperature of theliquid fuel container 16. Aheating blanket 82 is wrapped around and is in thermal contact with the liquid fuel container 16 (see alsoFIG. 2 ). Theheating blanket 82 is also electrically connected with theMCU 42. As discussed in further detail below, when theheating blanket 82 is activated by theMCU 42, it increases the temperature of theliquid fuel container 16, and therefore the pressure of the compressed gas inside thecontainer 16 expelling the liquid fuel therefrom. -
FIG. 4 is a flowchart illustrating a method of operating theair heater 10. In operation, as shown atstep 86, prior to the user depressing thetrigger 34 and actuating theswitch 40, thecontrol valve 62 is initially in its closed state blocking the flow of liquid fuel from thecontainer 16 to thecombustion chamber 18. Atstep 86, themotor 24 is also deactivated, such that thefan 26 is not running, and no current is flowing to theignitor 66. However, as long as themotor 24 is being powered by thebattery 32, theLED 46 indicates to the operator that theair heater 10 is "ready for use." Atstep 90, upon a first instance of an operator depressing thetrigger 34 against the bias of thetorsion spring 38, theswitch 40 is closed, thereby providing an electrical signal (i.e., a voltage input) to theMCU 42. Upon detecting this trigger actuation signal, theMCU 42 initiates a first timer, which will run for a first predetermined period of time, as shown atstep 94. In response to the trigger actuation signal, theLED 46 indicates to the operator that theair heater 10 is "warming up." - Then, at
step 98, the MCU checks to determine whether thetrigger 34 is still depressed and switch 40 is still closed upon expiration of the first timer. If thetrigger 34 is not still depressed, thecontrol valve 62 remains closed, themotor 24 remains deactivated, and no current flows toignitor 66. If however, thetrigger 34 is still depressed, theMCU 42 energizes thecontrol valve 62 to direct liquid fuel into thecombustion chamber 18 and (for a limited time) directs an electrical current to theignitor 66, creating repeated sparks to ignite the discharged liquid fuel at theorifice 68 in thecombustion chamber 18, as shown atstep 102. This ensures that a brief accidental or inadvertent depression of thetrigger 34 will not initiate operation of theair heater 10. - In some embodiments, the liquid fuel is preheated prior to combustion at the
orifice 68. Specifically, prior to entering theorifice 68, the liquid fuel is heated by the flame in thecombustion chamber 18 to a threshold temperature at which the liquid fuel is vaporized into a gaseous fuel state. The gaseous fuel then enters theorifice 68 for combustion by theignitor 66. Thus, in these embodiments, liquid fuel is prevented from entering theorifice 68. Rather the fuel only enters theorifice 68 in a gaseous state. - Concurrently with or shortly after the
MCU 42 directs an electrical current through theignitor 66, theMCU 42 also activates themotor 24 to rotate thefan 26 as shown atstep 102. Thefan 26 generates an axial airflow through thecombustion chamber 18, which is heated by the combusting liquid fuel. The heated airflow is then discharged from theheat outlet 20. In response to the opening ofcontrol valve 62, the current to ignitor 66, and activation ofmotor 24 to drivefan 26, theLED 46 indicates to the operator that theair heater 10 is "on", thus signaling to the operator that thetrigger 34 may be released. Then, as shown atstep 106, the operator may releasetrigger 34 while thecontrol valve 62 remains open andmotor 24 continues to drivefan 26. Thus, an operator may release thetrigger 34 while liquid fuel continues to flow to thecombustion chamber 18 to continue the heating operation, rather than needing to continually hold thetrigger 34 depressed. - With continued reference to
FIG. 4 , during operation of theair heater 10, thethermocouple 70 produces a voltage that is proportional to the temperature in thecombustion chamber 18 using the thermoelectric or "Seebeck" effect. Theamplifier 74 amplifies the voltage output by thethermocouple 70, and the amplified voltage is provided to theMCU 42 as a voltage input proportional to the temperature in thecombustion chamber 18. Because thethermocouple 70 is at an ambient temperature prior to operation of theair heater 10, after expiration of the first timer, theMCU 42 initiates a second timer, as shown atstep 110. The second timer will run for a second predetermined period of time while thecontrol valve 62 will remain energized (and therefore in its open state) and themotor 24 will remain activated to rotate thefan 26, regardless of the temperature detected by thethermocouple 70, and regardless of whether thetrigger 34 remains held in its depressed position or is released. As shown atstep 114, the thermocouple continues to produce voltage proportional to the temperature in thecombustion chamber 18, thereby "detecting" the temperature of thecombustion chamber 18. - As shown at
step 118, upon expiration of the second timer, the MCU determines whether the temperature in thecombustion chamber 18 is greater than or equal to a threshold temperature as detected by thethermocouple 70. If the temperature in thecombustion chamber 18 is greater than or equal to the threshold temperature theMCU 42 will maintain thecontrol valve 62 in its open state and continue to drive themotor 24 andfan 26, as shown atstep 122. - If the temperature in the
combustion chamber 18 has not, upon expiration of the second timer, reached the threshold temperature, theMCU 42 will de-energize the control valve 62 (thereby switching it from the open state to the closed state) and deactivate themotor 24, as shown atstep 126. Thus, if theignitor 66 fails to ignite the liquid fuel after thetrigger 34 is depressed for the first time, thecontrol valve 62 will close and discontinue the flow of liquid fuel to thecombustion chamber 18. In response to the temperature not reaching the threshold temperature upon expiration of the second timer, theLED 46 indicates to the operator that ignition failed, thus signaling to the operator that the process for starting theair heater 10 must be re-initiated atstep 90. - If the
control valve 62 is kept open and themotor 24 remains activated atstep 122, the temperature of thecombustion chamber 18 continues to be detected atstep 130 via thethermocouple 70 andamplifier 74 as described above. As shown atstep 134, theMCU 42 continuously determines whether the temperature of thecombustion chamber 18 detected atstep 130 is greater than or equal to the threshold temperature. If the temperature in thecombustion chamber 18 is greater than or equal to the threshold temperature, the process run by theMCU 42 simply returns to step 130 and continues cycling betweensteps combustion chamber 18 is equal to or above the threshold temperature. If, however, the temperature in thecombustion chamber 18 ever drops below the threshold temperature as determined atstep 134 after a period of continuous operation of the air heater 10 (coinciding with a flame-out), theMCU 42 will de-energize the control valve 62 (thereby switching it from the open state to the closed state) and initiate a third timer while themotor 24 continues to drive thefan 26, as shown atstep 138. In response to a flame out, theLED 46 indicates to the operator that a flame out has occurred. - While the third timer is running, the
motor 24 continues to drive thefan 26 during a "cool down" period, during which the LED indicates to the operator that theair heater 10 is going through a "cool down." Upon expiration of third timer themotor 24 is deactivated and thus thefan 26 stops running, as shown atstep 142. In some embodiments, the third timer is 30 seconds but in other embodiments, the third timer is longer or shorter than 30 seconds. - Alternatively, as shown at
step 146, the operator may simply depress the trigger 34 a second instance to actuate theswitch 40 again, prompting theMCU 42 to close thecontrol valve 62 and initiate the third timer while themotor 24 continues to drive thefan 26 for the "cool down" process, as shown atstep 138. - During operation, as the liquid fuel in the
liquid fuel container 16 is used up, the tank gets colder and the pressure in theliquid fuel container 16 drops, affecting (i.e., reducing) the flow rate of the liquid fuel discharged into thecombustion chamber 18. Thus, during operation of theair heater 10, thetemperature sensor 78 continuously monitors the temperature of the liquid fuel container 16 (FIG. 3 ). If the temperature of theliquid fuel container 16 drops below a threshold temperature, thetemperature sensor 78 provides an electrical signal (e.g., a voltage input) to theMCU 42, which in turn activates theheating blanket 82 to raise and/or maintain theliquid fuel container 16 at a predetermined temperature, such as 35 degrees Celsius. Thus, theheating blanket 82 prevents the temperature of theliquid fuel container 16 from falling so low that the pressure in theliquid fuel container 16 is insufficient to provide a constant flow rate of liquid fuel from thecontainer 16. - Various features of the invention are set forth in the following claims.
Claims (15)
- A liquid fuel air heater comprising:a housing defining a motor housing portion and a grip portion extending from the motor housing portion;an electric motor positioned in the motor housing portion;a combustion chamber at least partially positioned within the motor housing portion;a fan driven by the motor when activated for generating an axial airflow through the combustion chamber; anda battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement, the battery pack being removably coupled to the grip portion of the housing for supplying power to the motor.
- The liquid fuel air heater of claim 1, further comprising a liquid fuel container for providing liquid fuel to the combustion chamber.
- The liquid fuel air heater of claim 2, further comprising a heating blanket in thermal contact with and at least partially surrounding the liquid fuel container, wherein the heating blanket, when activated, increases a temperature of the liquid fuel container.
- A liquid fuel air heater comprising:a housing defining a motor housing portion;an electric motor positioned in the motor housing portion;a combustion chamber at least partially positioned within the motor housing portion;a fan driven by the motor when activated for generating an axial airflow through the combustion chamber;a liquid fuel container at least partially positioned in the housing for providing liquid fuel to the combustion chamber; anda heating blanket in thermal contact with and at least partially surrounding the liquid fuel container,wherein the heating blanket, when activated, increases the temperature of the liquid fuel container.
- The liquid fuel air heater of claim 4, wherein the housing defines a grip portion extending from the motor housing portion;
and, optionally, further comprising a battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement, wherein the battery pack is removably coupled to the grip portion of the housing for supplying power to the motor. - The liquid fuel air heater of any one of claim 3 to 5, wherein the heating blanket is activated when the temperature of the liquid fuel container falls below a threshold temperature.
- The liquid fuel air heater of any one of claims 2 to 6, further comprising a control valve to alternatively permit or prevent the flow of liquid fuel from the liquid fuel container to the combustion chamber;
and, optionally, wherein the control valve is a solenoid actuated valve. - The liquid fuel air heater of claim 7, further comprising an ignitor configured to ignite liquid fuel in the combustion chamber;
and, optionally, further comprising an actuator moveable between a first position in which the motor is off and the control valve is closed and a second position, wherein the actuator biased to the first position, and wherein when the actuator is in the second position for a first predetermined period of time, the control valve is opened, the ignitor creates sparks to ignite liquid fuel in the combustion chamber, and the motor is activated. - The liquid fuel air heater of claims 7 or 8,
wherein after the control valve is opened, if a temperature of the combustion chamber is below a threshold temperature for a second predetermined period of time, the control valve is closed; or
wherein after the control valve is opened, if a temperature of the combustion chamber is greater than or equal to a threshold temperature for a second predetermined period of time, the control valve is kept open. - The liquid fuel air heater of any one of claims 7 to 9, further comprising a thermocouple configured to produce a voltage that is proportional to the temperature of the combustion chamber and provided as an input to a controller, wherein after the control valve is opened if the temperature of the combustion chamber is greater than or equal to the threshold temperature for the predetermined period of time, the controller keeps the control valve open in response to receiving the input.
- A method of operating a liquid fuel air heater, the method comprising:moving an actuator from a first position to a second position a first instance;initiating a first timer in response to the actuator reaching the second position;following expiration of the first timer, detecting whether the actuator is in the first position or the second position;following detection of the actuator in the second position, opening a control valve to direct liquid fuel from an onboard liquid fuel container toward a combustion chamber;directing an electrical current to an ignitor in the combustion chamber to ignite the fuel in the combustion chamber; andactivating a motor to drive a fan for generating an axial airflow through the combustion chamber, which is heated by the combusting fuel and discharged from the combustion chamber.
- The method of claim 11, further comprising:initiating a second timer;following expiration of the second timer, detecting whether a temperature of combustion chamber is less than a threshold temperature;following detection of the combustion chamber temperature being less than the threshold temperature, closing the control valve; anddeactivating the motor;orinitiating a second timer;following expiration of the second timer, detecting whether a temperature of combustion chamber is greater than or equal to a threshold temperature;following detection of the combustion chamber temperature being greater than or equal to the threshold temperature, maintaining the control valve in an open state; andmaintaining activation of the motor.
- The method of claim 12, further comprising:following maintaining the control valve in an open state and maintaining activation of the motor, detecting whether the temperature of combustion chamber is greater than or equal to the threshold temperature;following detection of the combustion chamber temperature being less than the threshold temperature, closing the control valve and initiating a third timer; andfollowing expiration of the third timer, deactivating the motor;orfollowing maintaining the control valve in an open state and maintaining activation of the motor, detecting whether the temperature of combustion chamber is greater than or equal to the threshold temperature;following detection of the combustion chamber temperature being greater than or equal to the threshold temperature, maintaining the control valve in an open state; andmaintaining activation of the motor.
- The method of claim 11, further comprising:following activation of the motor, releasing the actuator and allowing the actuator to move from the second position to the first position;following release of the actuator, maintaining the control valve in an open state; andmaintaining activation of the motor.
- The method of claim 14, further comprising:moving the actuator from the first position to the second position a second instance;detecting that the actuator is in the second position;following detection of the actuator in the second position, closing the control valve; anddeactivating the motor.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810414529.6A CN110440438A (en) | 2018-05-03 | 2018-05-03 | Air heater |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3598021A2 true EP3598021A2 (en) | 2020-01-22 |
EP3598021A3 EP3598021A3 (en) | 2020-04-08 |
Family
ID=66397158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19172598.5A Withdrawn EP3598021A3 (en) | 2018-05-03 | 2019-05-03 | Liquid fuel air heater |
Country Status (4)
Country | Link |
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US (1) | US20190338950A1 (en) |
EP (1) | EP3598021A3 (en) |
CN (1) | CN110440438A (en) |
CA (1) | CA3042196A1 (en) |
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JPS61250413A (en) * | 1985-04-27 | 1986-11-07 | Nakajima Doukoushiyo:Kk | Hot air generator |
US4640680A (en) * | 1985-05-20 | 1987-02-03 | Schilling Thaddeus A | Portable gas-fired forced-draft heater |
US4800654A (en) * | 1987-10-15 | 1989-01-31 | Mark R. Levin | Handheld cordless hair dryer |
FR2638514B1 (en) * | 1988-10-28 | 1991-09-27 | Applic Gaz Sa | HOT AIR GENERATING APPARATUS COMPRISING A CATALYTIC BURNER |
JP3404981B2 (en) * | 1995-04-21 | 2003-05-12 | 日本鋼管株式会社 | Gas heating device |
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CN1242068A (en) * | 1996-11-19 | 2000-01-19 | 沙贝尔有限公司 | Cordless hydrocarbon fuel heated hairdryer |
JP4050001B2 (en) * | 2001-02-09 | 2008-02-20 | 株式会社 リーテック | Gas-fired hair dryer |
GB2409158A (en) * | 2003-12-18 | 2005-06-22 | Freedom Innovations Ltd | Cordless hairdryer with baffles |
JP2004081693A (en) * | 2002-08-28 | 2004-03-18 | Re-Tec:Kk | Gas combustion-type portable dryer and minus ion generating method in the portable dryer |
US6983550B1 (en) * | 2004-07-26 | 2006-01-10 | Arlo Lin | Gas hot air gun |
US20060236557A1 (en) * | 2005-09-14 | 2006-10-26 | Elysee Cosmetics Ltd. | Cordless hairdryer with movable baffle |
US7380347B2 (en) * | 2005-11-30 | 2008-06-03 | Coats Carrie R | Cordless electric hair dryer with case |
US7771191B2 (en) * | 2006-05-31 | 2010-08-10 | Irwin Industrial Tool Company | Safety mechanism for a torch |
JP2006247430A (en) * | 2006-06-23 | 2006-09-21 | Sanyo Electric Co Ltd | Gas type dryer |
CN101962904B (en) * | 2009-07-22 | 2012-07-18 | 声宝股份有限公司 | Touch system of washing machine and false touch elimination method used thereby |
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TW201541025A (en) * | 2014-04-22 | 2015-11-01 | Pro Iroda Ind Inc | Gas hot air gun head |
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EP3093578B1 (en) * | 2015-05-14 | 2018-12-26 | Dantherm S.P.A. | Portable fluid fuel air heater |
FR3045784B1 (en) * | 2015-12-18 | 2019-03-22 | Illinois Tool Works Inc | METHOD FOR CONTROLLING THE ACTUATION OF A GAS FASTENING TOOL AND CORRESPONDING DEVICE |
-
2018
- 2018-05-03 CN CN201810414529.6A patent/CN110440438A/en active Pending
-
2019
- 2019-05-02 US US16/401,282 patent/US20190338950A1/en not_active Abandoned
- 2019-05-03 EP EP19172598.5A patent/EP3598021A3/en not_active Withdrawn
- 2019-05-03 CA CA3042196A patent/CA3042196A1/en active Pending
Non-Patent Citations (1)
Title |
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None |
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Publication number | Publication date |
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CA3042196A1 (en) | 2019-11-03 |
EP3598021A3 (en) | 2020-04-08 |
US20190338950A1 (en) | 2019-11-07 |
CN110440438A (en) | 2019-11-12 |
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