EP3732405A1 - Hot-air fan and method for operating same - Google Patents
Hot-air fan and method for operating sameInfo
- Publication number
- EP3732405A1 EP3732405A1 EP19836486.1A EP19836486A EP3732405A1 EP 3732405 A1 EP3732405 A1 EP 3732405A1 EP 19836486 A EP19836486 A EP 19836486A EP 3732405 A1 EP3732405 A1 EP 3732405A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blower
- air flow
- air
- operating
- hot air
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 92
- 239000003570 air Substances 0.000 description 168
- 238000001816 cooling Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004023 plastic welding Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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 invention relates to a hot air blower, in particular a battery-operated hot air hand device and a method for operating the same.
- a hot air blower also called a heat gun
- a heat gun is a power tool that can be used to selectively heat a work area (workpiece).
- ambient air is drawn in by means of a blower device such as, for example, a fan wheel, heated by means of a heating device and then blown out through an outlet pipe onto the work area.
- a blower device such as, for example, a fan wheel
- the following common areas of application for hot-air blowers may be mentioned merely by way of example: removal of adhesive films, welding of plastics, deformation of plastics, removal of layers of paint or paint, in particular on wood or metal, disinfection of laboratory equipment, drying of objects.
- the invention is therefore based on the object to provide a hot air blower, in particular a battery-operated hand-held hot air blower and a method for operating the same, in which an operating temperature of an operating air stream can be achieved in an energy-efficient manner in a short time.
- a hot air blower which has a blower device for generating an air flow, a heating device for heating the air Currents and a control unit connected to the blower device and the heating device.
- the control unit is designed to regulate or control the blower device in such a way that the blower device generates a starting air flow that is reduced to an operating air flow when the heating device is switched on.
- a battery-operated handheld hot air blower or hot air gun in which, on the one hand, the heating device is supplied with maximum power, and on the other hand, the blower device does not immediately generate an operating air flow, i.e. an air flow, which is provided for the work process to be performed constantly after a heating phase. Rather, when the heating device or the hot air blower is switched on, a reduced initial air flow is initially generated by the blower device, which is reduced to the operating air flow, that is to say is smaller in terms of its air volume or air volume flow.
- an operating temperature can thus be reached in a rapid time and, furthermore, cooling of the heating coils, combined with increased power consumption, can be prevented.
- the blower is then switched to full operation, that is, to the generation of an operating air stream.
- the quotient of the air quantities of the initial air flow and the operating air flow is in a range between 10% and 90%, preferably in a range between 20% and 70%, and in particular in a range between 30% and 60%.
- the air volume of the operating air flow is in a range between 50 1 / min and 450 1 / min, preferably between 100 1 / min and 400 1 / min, and in particular between 200 1 / min. min and 350 1 / min.
- the full heating power is generated at the beginning, that is, if the control device controls the heating device in such a way that the heating device generates a constant heating power.
- the control device regulates the blower device in such a way that the air quantity of the air flow, starting with an air quantity of the initial air flow, increases in steps with at least one step or gradually to an air quantity of the operating air flow becomes.
- control device controls the blower device in such a way that the air volume of the initial air flow is kept constant for a predetermined time and is increased to the air volume of the operating air flow after the predetermined time.
- the hot air blower according to the invention can also have a sensor unit connected to the control unit for measuring the temperature of the air flow downstream of the heating device and / or the heating device.
- control device controls the blower device in such a way that the air volume of the initial air flow is increased to the air volume of the operating air flow depending on the temperature measured by the sensor device.
- control device controls the fan device in such a way that the air quantity of the initial air flow is increased to the air quantity of the operating air flow when a temperature threshold of the temperature measured by the sensor device is reached.
- the invention is particularly expedient for use in hot air blowers, which only a reduced supply power is available. It is therefore advantageous if the hot air blower has a wireless power supply.
- cordless hot air blower is designed as a battery-operated hand-held device.
- the blower device comprises an electric motor and at least one fan wheel which can be driven by the electric motor to generate the air flow. Because of the energy-efficient heating method of the invention, it is advantageous if the heating device is designed to provide a constant heating power in a range between 100 W and 1500 W, preferably in a range between 200 W and 1000 W, and in particular in a range between 600 W. and generate 900 W.
- the hot air blower furthermore has an operating switch for switching the hot air blower on and off, in particular at least the heating device, the blower device and the control unit.
- the invention provides a method for operating the hot air blower according to the invention, in which the heating device is first switched on and then an initial air flow reduced to the operating air flow is generated instead of generating a normal maximum operating air flow.
- Fig. 1 shows a highly simplified schematic diagram of a hot air blower 10 according to the invention.
- the hot air blower 10 shown in FIG. 1 has an elongated housing 12, on which an air outlet 14 for heated air is provided at one end.
- This heated air is generated by a (otherwise known) Bankeinrich device 16, through which air is taken in by means of a blower device 18 through an air inlet (not shown) and heated from the air outlet 14 to an operating temperature of up to approximately 500 ° C. , can exit.
- the operating temperature is between 400 and 500 ° C.
- the blower device 18 has an electric motor 20 and at least one fan wheel 22 which can be driven by the electric motor 20 to generate the air flow.
- the electric motor 20 of the blower device 18 is designed as a brush motor.
- the heating device 16 has at least one heating coil 16 a for heating the air flow LS.
- the heating coil 16a can for example be made of a nickel-chrome wire.
- the heating device 16 is designed to generate a constant heating power in a range between 100 W and 1500 W, preferably in a range between 200 W and 1000 W, and in particular in a range between 600 W and 900 W.
- a schematically shown control unit 24 effects both a temperature control (for example to an adjustable setpoint) with the aid of a sensor unit 26 designed as a temperature sensor and a suitable control of the heating device 16 or blower device 18.
- the control unit 24 can in this case be a hot air blower. Control or regulate and monitor operations at different work levels.
- the control unit 24 can operate the hot air blower 10 with at least two different heating powers or corresponding air flow temperatures of the air flow LS.
- the electrical energy supply of the hot air blower 10 takes place via an accumulator module 28, which can be attached or locked in a known manner on the underside of a pistol-shaped handle section 30 of the hot air blower 10.
- the accumulator module 28 has an electrical energy store 28a, which is preferably designed as an electrical accumulator.
- a lithium-ion battery can be provided as the electrical accumulator 28a, which can be set up for an operating voltage of 36 V or 18 V.
- a hot air blower output of the hot air blower 10 according to the invention can be provided in the range of, for example, 600 W or 900 W.
- the hot air blower 10 thus has a wireless power supply according to the embodiment shown in FIG. 1.
- the cordless hot air blower 10 can be designed as a battery-operated hand-held device.
- the invention is not intended to be limited to the operation of a battery-operated hot air blower, but is used wherever an energy-efficient and rapid achievement of the operating temperature is expedient.
- the hot air blower 10 can also have an operating switch 32, by means of which the hot air blower 10, in particular at least the heating device 16, the blower device and the control unit 24 can be switched on or off.
- the operating switch 32, the blower device 18, the heating device 16 and the sensor unit 26 are electrically connected to the control unit 24 such that electrical signals from the control unit 24 are transmitted to the devices 16, 18 and / or the devices 16, 18 by the Control unit 24 can be supplied with electrical power.
- control unit 24 receives an on / off signal from the operating switch 32, by means of which the heating device 16 can be switched on. Furthermore, the control unit 24 is electrically connected to the sensor unit 26 in order to either receive a measurement signal or only to measure a measurement current through the sensor unit 26 (for example when using a Pt 100 temperature sensor element).
- the hot air blower 10 comprises the blower device 18 for generating an air flow LS, which emerges at the air outlet 14 after being heated by the heating device 16.
- the control unit 24 is electrically connected to the blower device 18 and the heating device 16.
- the function according to the invention and the corresponding operating method of the hot air blower 10 are to be explained below.
- the aim of the invention is to generate an operating temperature of the air flow LS as quickly as possible in an energy-efficient manner, that is to say particularly expediently when using a battery-operated hot air blower, although only a low heating power is available in comparison to cable-operated hot air blowers. According to the invention, this is achieved in that when the heating device 16 is switched on, the blower device 18 is regulated by the control unit 24 in such a way that the blower device 18 generates a starting air flow reduced to an operating air flow as the air flow LS.
- An operating air flow LS is to be defined as operating air flow, which is generated by the blower device 18 during a working operation of the hot air blower 10 in continuous operation.
- the operating air flow thus differs from the initial air flow in that it is generated constantly by the blower device 18 after a warm-up phase of the hot air blower 10, whereas the initial air flow is to be understood as an air flow LS which is generated directly after the heating device 16 is switched on is generated by the blower device 18.
- the heating device 16 or the heating coil 16a of the heating device 16 can be heated more quickly, since less or reduced cooling by the initial air flow ( compared to cooling due to a stronger operating air flow).
- a time course of the heating power P H of the heater 16 and the air quantities Q of the air flow LS of the blower device 18 is shown schematically Darge.
- the heating power P H is switched to the full heating power PI of the heating device 16 by the control unit 24 at a time t 0 , that is to say when the heating device 16 is switched on.
- control unit 24 controls the fan device 18 when the heating device 16 is switched on in such a way that it does not immediately generate an operating air flow with the air quantity or the volume flow Q2 at time t 0 , but first one Initially air flow with the air volume or the volume flow Q l.
- the control device 24 thus regulates the heating device 16 such that the heating device 16 generates a constant heating power P H immediately after switching on the heating device 16.
- control device 24 controls the blower device 18 after turning on the heater 16 or the hot air blower 10 such that the air amount Q of the air flow LS begins with an air amount Q l of the start air flow , is increased in steps with at least one step or gradually to an air quantity Q2 of the operating air flow.
- the transition between the initial air flow Q 1 and the operating air flow Q2 can also take place over several stages.
- an air quantity Q3 is set as the intermediate air flow.
- the transition is not only step-like, but is gradually increased with a constant gradient or by means of any steady characteristic curve from an initial air flow with the air quantity Q l to an operating air flow with the air quantity Q2.
- a mixture of step-like increase and gradual increase is generated by the blower device 18, as shown by the broken lines in Fig. 2 (c).
- the initial air flow Q “1 is zero and then increased from time t 0 .
- the quotient of the air quantities Q 1 / Q 2 of the initial air flow and the operating air flow can be approximately 50%.
- the quotient of the air quantities Q 1 / Q 2 of the initial air flow and the operating air flow can be in a range between 0% and 90%, in a range between 10% and 90%, preferably in a range between 20% and 70 % and in particular in a range between 30% and 60%.
- the air quantity Q 1 of the initial air flow of the blower device 18 can be in a range between 0 1 / min and 400 1 / min, in a range between 10 1 / min and 400 1 / min, preferably between 20 1 / min and 300 1 / min, between 20 1 / min and 200 1 / min, between 50 1 / min and 200 1 / min, and in particular between 50 1 / min and 150 1 / min.
- the air quantity Q2 of the operating air flow of the blower device 18 can be in a range between 50 1 / min and 450 1 / min, preferably between 100 1 / min and 400 1 / min, and in particular between 200 1 / min and 350 1 / min.
- the blower device 18 can be controlled by the control unit 24 in such a way that the air quantity Q l of the initial air flow is kept constant for a predetermined time At from the time t 0 when the heating device 16 is switched on and after the predetermined time has elapsed Time At at time ti is increased to the air quantity Q2 of the operating air flow.
- the predetermined time At can be in a range between 1 s and 150 s, between 5 s and 100 s, between 5 s and 40 s, and in particular in a range between 5 s and 25 s.
- FIG. 3 an operating method according to the second embodiment of the invention is shown.
- control unit 24 regulates the blower device 18 such that the air quantity Q 1 of the initial air flow is increased to the air quantity Q 2 of the operating air flow as a function of the temperature T measured by the sensor device 26.
- the sensor unit 26 can either measure the temperature of the air flow downstream from the heating device 16 and / or the temperature of the heating device 16 itself.
- a temperature sensor can be provided on a ceramic housing of the heating device 16, which is close to the heating coils 16 a of the heating device 16. Which temperature is measured by the sensor unit 26 is of secondary importance for the method and function according to the invention.
- the temperature of the heating coils 16a itself can be determined on the basis of their temperature-dependent resistance.
- the heating power P H of the heater 16 is set to full power PI. Due to the reduced initial air flow Q 1 (see FIG. 3 (c)) in an initial phase or in the warm-up phase of the operation of the hot air blower 10, the temperature T of the heating device 16 measured by the sensor unit 26 rises rapidly, as in FIG. 3 (b) is shown.
- the control unit 24 regulates the blower device 18 in such a way that it switches in steps from an initial air flow Q l to an operating air flow Q2. From the changeover time tl, the temperature T of the heating device 16 rises less rapidly due to the increased fan power and passes asymptotically into the operating temperature T2.
- the threshold temperature T l can be in a range between 100 degrees Celsius and 600 degrees Celsius, in a range between 100 degrees Celsius and 500 degrees Celsius, in a range between 200 degrees Celsius and 400 degrees Celsius, or in a range between 250 degrees Celsius and 350 degrees Celsius are.
- the operating temperature T2 can be in a range between 200 degrees Celsius and 700 degrees Celsius, in a range between 300 degrees Celsius and 700 degrees Celsius, in a range between 400 degrees Celsius and 700 degrees Celsius, or in a range between 500 Degrees Celsius and 600 degrees Celsius are.
- an operating temperature T2 is quickly reached by the method according to the invention, with an energy-efficient start of the hot air blower 10 being achieved at the same time. This is due to the fact that the power consumption of the hot air blower 10 is reduced by the blower device 18 owing to the lack of full cooling capacity and is introduced completely into the heating of the heating device 16. As a positive side effect, the usability also increases because the operating temperature is reached faster for the start of a work process.
- the present invention is not limited to the exemplary embodiments or operating modes shown, rather numerous other and alternative setting and selection options are available.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Direct Air Heating By Heater Or Combustion Gas (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019100850.6A DE102019100850A1 (en) | 2019-01-14 | 2019-01-14 | Hot air gun and method of operating the same |
PCT/EP2019/086135 WO2020148063A1 (en) | 2019-01-14 | 2019-12-18 | Hot-air fan and method for operating same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3732405A1 true EP3732405A1 (en) | 2020-11-04 |
EP3732405B1 EP3732405B1 (en) | 2023-10-04 |
Family
ID=69165323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19836486.1A Active EP3732405B1 (en) | 2019-01-14 | 2019-12-18 | Hot-air fan and method for operating same |
Country Status (5)
Country | Link |
---|---|
US (1) | US11965676B2 (en) |
EP (1) | EP3732405B1 (en) |
CN (1) | CN111971514B (en) |
DE (1) | DE102019100850A1 (en) |
WO (1) | WO2020148063A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202021104784U1 (en) * | 2021-09-06 | 2021-12-10 | Leister Technologies Ag | hot air hand tool |
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-
2019
- 2019-01-14 DE DE102019100850.6A patent/DE102019100850A1/en active Pending
- 2019-12-18 CN CN201980025755.8A patent/CN111971514B/en active Active
- 2019-12-18 EP EP19836486.1A patent/EP3732405B1/en active Active
- 2019-12-18 WO PCT/EP2019/086135 patent/WO2020148063A1/en unknown
- 2019-12-18 US US17/053,878 patent/US11965676B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102019100850A1 (en) | 2020-07-16 |
EP3732405B1 (en) | 2023-10-04 |
US11965676B2 (en) | 2024-04-23 |
CN111971514A (en) | 2020-11-20 |
WO2020148063A1 (en) | 2020-07-23 |
CN111971514B (en) | 2022-05-24 |
US20210372662A1 (en) | 2021-12-02 |
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