Hot air fan

Abstract

The invention relates to a hot air fan (10) with a rod-shaped pistol grip-free housing (12), a fan device (14) for generating an airflow, a heating device (16) for heating the airflow, an air outlet (18) at the distal end of the housing (12) in order to deflect the airflow onto a workpiece, a grip section (GA) at the proximal end of the housing (12) for manually holding the hot air fan (10), and an energy storage device (20) which is releasably connected to the housing (12) for storing electric energy and providing the electric energy.

Description

[0001] The invention relates to a hot air blower, in particular a battery-operated hot air handheld device.

[0002] Common hot air blowers are typically designed as heat guns, featuring a downward-facing handle reminiscent of a pistol. However, due to their pistol-like shape, such heat guns are relatively bulky, making their use in confined spaces uncomfortable or even impossible. This is especially true when the heat gun is used in a narrow recess or opening. Heat guns are also unwieldy and complicate work in areas such as construction sites, particularly during roofing work.

[0003] One option is to use rod-shaped hot air devices. One such hot air device is known, for example, from document DE 2011 061 855 U1. However, these devices rely on an external power supply and must be powered via a power cable.

[0004] Document CN 108800560 A further describes a pistol-like hot air device with a pistol grip and a machine head. The pistol grip is connected to the machine head and can be pivoted relative to it. However, this hot air device, equipped with an articulated device, is not suitable for professional use because the hot air device lacks the required robustness. Document DE 35 39 615 A1 describes a rod-shaped hot air generator with a tubular hollow body that serves as a supporting housing for a heating element, a turbine, and a motor. Document DE 20 2011 052043 U1 relates to a handheld hot air device with a digital control unit with a universal control element. EP 3 553 411 A1 describes a heating core for hot air guns and a hot air gun. The heating core comprises a holder and a heating wire arranged on the holder.

[0005] The object of the present invention is therefore to provide a hot air device which, on the one hand, is handy and can be used in confined spaces such as recesses / openings and, on the other hand, does not require an external energy source.

[0006] This object is achieved by a hot air blower according to patent claim 1.

[0007] In particular, this object is achieved by a hot air blower having a rod-shaped housing with a blower device for generating an air flow, a heating device for heating the air flow, an air outlet at a distal end of the housing for directing the air flow onto a workpiece; a handle portion at a proximal end of the housing for holding the hot air blower by means of a hand; and an energy storage device detachably connected to the housing for storing electrical energy and providing the electrical energy.

[0008] According to one embodiment of the invention, the energy storage device is connected to the housing in such a way that the center of mass of the hot air gun with the connected energy storage device is located in the area of ​​the handle section. This center of mass arrangement makes the hot air gun particularly easy to handle, which is particularly advantageous for manual lifting, holding, and setting down. Furthermore, safe processing of the workpiece is possible even in confined spaces without having to consider an external energy source or a connection via a power cable. This also expands the range of applications of the hot air gun.

[0009] The blower unit and the heating unit can be located in the handle section of the housing. This allows for a compact design of the hot air blower.

[0010] Furthermore, the energy storage device can be detachably connected to the housing at a proximal end of the handle portion.

[0011] In this case, the energy storage device can be at least partially accommodated in the housing in the connected state, so that a secure connection is ensured.

[0012] The energy storage device can comprise a battery module with electrical energy storage means, wherein the energy storage means are designed as accumulators. Due to the progressive development of battery technology, particularly in the field of lithium-ion batteries, accumulators with a long service life and large storage capacity can be used.

[0013] The battery module can be detachably connected to the housing via a plug-in connection. This plug-in connection allows the battery module to be easily attached to or detached from the housing.

[0014] The hot air blower may further comprise a control unit configured to control the blower device and the heating device.

[0015] In this context, the blower can have a sensor unit connected to the control unit, which is configured to detect the temperature of the air flow and / or the heating device. This can ensure that no overheating occurs in the area of ​​the heating device and / or at the air outlet (e.g., a nozzle) of the hot air blower.

[0016] The blower device may comprise an electric motor and at least one fan wheel drivable by the electric motor for generating the air flow.

[0017] The hot air blower may further comprise an operating switch to switch on at least the heating device, the blower device and the control unit.

[0018] The hot air blower can also have a display that shows status data associated with the hot air blower. The status data can include the temperature of the air flow and / or the heating device, the charge level of the energy storage device, and / or the heating output of the hot air blower. This allows a user to retrieve the current operating data of the hot air device and make appropriate adjustments if necessary.

[0019] The display can be an LCD display.

[0020] In this context, the display means can be arranged at a distal end of the handle portion, in particular at an angle, so that it faces a user's field of vision. This provides the user with optimal insight into the current status data, even during machining of the workpiece.

[0021] Furthermore, the hot air blower may have an intake opening at a distal end of the handle portion for sucking in air.

[0022] The housing can be pistol grip-free, allowing easy handling of the hot air gun.

[0023] Furthermore, the hot air blower can be a handheld device, in particular a hot air rod.

[0024] In particular, the hot air blower can be designed as a rigid, elongated, non-angled or non-bendable hot air rod, which has a housing that is designed without a pistol grip.

[0025] Furthermore, in a further embodiment, the hot air blower has a blower section in which the blower device and the heating device are arranged, as well as an energy storage section formed in the connected state of the energy storage device.

[0026] A cylindrical envelope of the blower section, generated in a longitudinal direction of the hot air blower, can surround the handle section and / or the energy storage section, so that when the hot air blower is placed on a flat surface, it always lies in such a way that the air outlet points upwards.

[0027] Furthermore, this configuration allows the air outlet to be oriented in such a way that it points away from a support surface of the hot air blower when the hot air blower is stored away. Such an orientation reduces the risk of accidental damage to the support surface and / or the hot air blower. With a conventional hot air blower, such damage occurs, for example, if the air outlet is still very hot from use and touches the support surface and burns when the hot air blower is stored away.

[0028] In one, two, three, four, or all stable stored positions of the hot air blower, the air outlet can be aligned at least horizontally to the support surface or point upwards away from the support surface. A vertical orientation of the air outlet away from the support surface is also possible.

[0029] In a further example, the hot air blower can also be designed such that, in a stored state, the air outlet always points away from a support surface of the hot air blower.

[0030] Furthermore, it is possible for the hot air blower to be designed such that when placed on a support surface, at least one support edge line of the blower section and one support edge line of the energy storage section lie in a common plane.

[0031] In a further embodiment, the energy storage section of the hot air blower can have a maximum radial extent, measured from the longitudinal axis of the hot air blower, that is equal to or smaller than a maximum radial extent of the blower section measured from the longitudinal axis in the same radial plane as the radial extent of the energy storage section. This ensures that the air outlet points away from the support surface in at least one, or at least two, or at least three positions of the hot air blower on a support surface.

[0032] In the connected state, the energy storage device can be arranged obliquely to the longitudinal axis of the hot air blower and can be detachably connected to the housing at a proximal end of the handle section.

[0033] The blower section can also be designed as a collar part.

[0034] The collar part may have a round cylindrical shape, a hexagonal cylindrical shape, or an octahedral cylindrical shape, wherein the longitudinal axis of the cylindrical shapes extends in a longitudinal direction of the hot air blower.

[0035] In another example, the hot air blower may comprise at least one adjustment means that can adjust or adjust a temperature of the air flow.

[0036] The adjustment means can be designed as an adjustment wheel, with the adjustment being regulated by a brake located in the housing. The brake can make it difficult or slow down the rotation of the adjustment wheel, thereby preventing it from rotating unintentionally.

[0037] The adjustment means may be arranged at a distal end of the handle portion so as to face a field of vision of a user and thus enable easy adjustment and / or adjustment.

[0038] In the following, the invention is described using an embodiment which is explained in more detail by the accompanying drawings.

[0039] Here are schematically shown: Fig. 1 a schematic view of an embodiment of a hot air blower according to the present invention; Fig. 2 a schematic view of an embodiment of the hot air blower according to the present invention; Fig. 3 and Fig. 4 schematic view or top view of the Fig. 2 shown embodiment of the hot air blower according to the present invention; Fig. 5 to 12 schematic, perspective views of an embodiment of the hot air blower according to the present invention; Fig. 13A to 13C schematic, perspective views of another embodiment of the hot air blower according to the present invention; Fig. 14A to 14Cschematic perspective views of another embodiment of the hot air blower according to the present invention; and Fig. 15A to 15C schematic, perspective views of another embodiment of the hot air blower according to the present invention.

[0040] In the following, the same reference symbols are used for identical and equivalent components.

[0041] Fig. 1 shows a simplified schematic view of an embodiment of a hot air blower 10 according to the present invention. The hot air blower 10 has a rod-shaped housing 12, which comprises a blower device 14 for generating an air flow, a heating device 16 for heating the air flow, and an air outlet 18 arranged at a distal end of the housing 12. The air flow is directed onto a workpiece (not shown) through the air outlet 18. Fig. 1shown). The air outlet 18 can be designed as a nozzle 17, which can be replaced as needed. The air stream heated by the hot air blower generally has a temperature of several hundred degrees Celsius, in particular a temperature between 400 and 800 degrees Celsius, preferably approximately 500 degrees Celsius.

[0042] The Fig. 1 The hot air gun 10 shown further comprises a handle portion GA at a proximal end of the housing 12, which is designed so that a user can hold the hot air gun 10 with one hand. In particular, unlike conventional hot air guns, the handle portion GA is not located on a downward-facing pistol grip, but extends along a longitudinal axis L, which in Fig. 1 indicated by an arrow, in the circumferential direction around the longitudinal axis L.

[0043] In one embodiment, the handle portion GA can extend over at least one third, preferably over at least half in the direction of the longitudinal axis L of the housing 12.

[0044] The entire, full-circumference handle section GA can be designed to be heat-protected and thus be gripped safely. For example, the handle section GA is made of plastic and arranged with respect to the heated air flow inside the housing 12 so that undue heating is excluded. The temperature of the handle section GA preferably does not exceed 60°C, in particular 50°C. The handle section GA can also be anatomically shaped so that the hot air blower 10 is particularly comfortable to grip. In the area of ​​the handle section GA, an intake opening (not in Fig. 1 shown) to draw in air.

[0045] Furthermore, the hot air blower 10 comprises an energy storage device 20 detachably connected to the housing 12 for storing electrical energy and providing the electrical energy. The energy storage device 20 can, for example, be arranged at the proximal end of the handle section GA, which in Fig. 1 is illustrated in a simplified manner.

[0046] The energy storage device 20 is connected to the housing 12 in such a way that the center of mass of the hot air blower 10 with the connected energy storage device 20 is located in the region of the handle section GA.

[0047] This ensures optimal handling of the hot air gun 10, preventing it from tipping or lifting during processing of a workpiece. Furthermore, the rod-shaped design allows the hot air gun 10 to be used in narrow or hard-to-reach areas without the risk of jamming or getting stuck, especially if the gun handle is no longer present.

[0048] The blower device 14 and the heating device 16 can be arranged in the handle section GA of the housing 12, which is simplified in the Fig. 1 shown embodiment. However, this is not restrictive and various designs are possible. For example, Fig. 2a schematic view of another embodiment of the hot air blower 10 according to the present invention, in which the blower device 14 and the heating device 16 are not arranged in the handle section GA. As shown in Fig. 2 As can be seen, the blower device 14 and the heating device 16 are located in a front section of the housing 12. Fig. 1 and Fig. 2 However, the arrangements shown are only examples and may vary depending on requirements.

[0049] As already described above, the energy storage device 20 can be detachably connected to the housing at the proximal end of the handle section GA. This is shown in Fig. 3 which illustrates an unconnected state of the energy storage device 20 and the proximal end of the handle portion GA. The area is in Fig. 2 and Fig. 3 highlighted by a dashed ellipse.

[0050] In a further embodiment (not in Fig. 1 and Fig. 2(shown) the energy storage device 20 can be at least partially accommodated in the housing 12 in the connected state. This can, for example, enable a secure connection.

[0051] In a further embodiment, the energy storage device 20 may comprise an accumulator module with electrical energy storage means. The energy storage means may be configured as accumulators.

[0052] For example, the battery module can be detachably connected to the housing by means of a plug-in connection. This allows it to be easily attached to and removed from the housing 12. In another example, it can be cylindrical and inserted into the handle section GA. However, this is not limiting, and other connection types are possible. In another embodiment, the battery module can be connected to the housing 12 by means of a snap-in connection.

[0053] The Fig. 1 and Fig. 2 The hot air blower 10 shown may further comprise a control unit 22 that controls the blower device 14 and the heating device 16. The control device 22 is connected to the heating device and the blower device 14, which in Fig. 1 and Fig. 2 illustrated by corresponding lines.

[0054] Furthermore, the hot air blower 10 can have a sensor unit 24 connected to the control unit 22, which detects the temperature of the air flow and / or the heating device 14. The Fig. 2 The sensor unit 24 shown is arranged in the area of ​​the heating device 16 and enables prompt detection of overheating of the heating device 14. For example, in such a case, the control unit 22 can automatically switch off the hot air blower 10 and / or generate a warning signal.

[0055] The blower device 14 can have an electric motor 14a and at least one fan wheel 14b that can be driven by the electric motor 14a to generate the air flow.

[0056] By means of an operating switch BS of the hot air blower 10, which simplifies Fig. 2 As illustrated, at least the heating unit 16, the blower device 14 and the control unit 22 can be switched on.

[0057] Likewise, the hot air blower 10 can have a display means 26 that displays status data associated with the hot air blower 10. The status data includes, for example, information about the temperature of the air flow and / or the heating device 14, a charge state of the energy storage device 20 and / or a heating power of the hot air blower 10. Such a display means is, for example, in Fig. 4 shown, which is a top view of the Fig. 2The illustrated embodiment of the hot air blower 10 is illustrated. In addition to the display means 26, further switches S1, S2 and a slider S3 are also shown in simplified form. Using the slider S2, for example, the temperature can be easily set and / or readjusted. Additional functions can be activated or deactivated using the switches S1, S2.

[0058] The display means (26) can be designed, for example, as an LCD display. Other display means 26, such as a TFT (thin-film transistor) display, are also possible.

[0059] The display means 26 can be arranged at a distal end of the handle section GA, in particular bevelled, so that it faces a field of vision of a user (not in Fig. 4 shown).

[0060] Furthermore, the housing 12 is pistol grip-free.

[0061] The hot air blower 10 is a handheld device, in particular a hot air rod.

[0062] In the Figures 5 to 12 further schematic perspective views of an embodiment of the hot air blower 10 according to the present invention are shown.

[0063] The Figures 13A to 13C as well as the Figures 14A to 14C and 15A to 15C show further embodiments.

[0064] As can be seen from the Figures 1 to 12 and 13A to 15C As is clearly evident, the invention claims a rod-shaped hot air blower 10 that is designed as a rigid, robust rod and has no joints or can be converted in any other way from a rigid, longitudinal shape into an angled shape. The hot air blower 10 is thus designed as a rigid, elongated, non-bendable or non-bendable hot air rod, with the housing 12 being designed without a pistol grip.

[0065] The Figures 13A , 14A and 15AEach shows a side view of the hot air blower 10 with the handle section GA, a blower section GBA, and an energy storage section ESA. The blower device 14 and the heating device 16 are arranged in the blower section GBA. Likewise, the intake opening can also be included in the blower section GBA. Furthermore, the Fig. 13A , 14A , and 15A The illustrated energy storage section ESA is formed when the energy storage device 20 is connected to the housing 12. The side views show the hot air blower 10 along a longitudinal direction LR, which extends from a proximal, rear end of the hot air blower 10 to a distal, front end.

[0066] Furthermore, in the Figures 13B , 14B and 15B the respective top views of the hot air blower 10 and in the Figures 13C , 14C and 15C the respective front views are shown.

[0067] In the Figures 13A, 13B , 14A, 14B , 15A and 15B A longitudinal axis LA of the hot air blower 10 is shown, which coincides, for example, with a central axis of the air outlet 18, in particular a rotational axis of the fan wheel 14b and / or a central axis of the handle section GA. The longitudinal axis LA is arranged parallel to the longitudinal direction LR. According to the invention, the longitudinal axis LA should therefore be defined as an axis that corresponds to the radially symmetrical line of symmetry of the cylindrical or conical nozzle 17. In any case, the longitudinal axis LA forms the central axis of the air flow passing through the housing 12 and / or in the flow direction and / or leaving the nozzle 17.

[0068] A cylindrical envelope of the blower section GBA generated in the longitudinal direction LR of the hot air blower 10 surrounds or delimits the handle section GA and the energy storage section ESA. The cylindrical envelope is in the Fig. 13B and 14Bshown examples by a dashed line, in Fig. 15B illustrated by a solid line. In Fig. 13B , 14B and 15B It extends to the energy storage section EBA. It is also possible that it only surrounds or delimits the handle section GA.

[0069] The cylindrical envelope is understood to be a rectilinear extension of a surface along the longitudinal direction LR, which in this case surrounds the hot air blower 10 starting from the blower section GBA and thus encloses the handle section GA and the energy storage section ESA. The envelope can delimit the corresponding sections GA, ESA within a range of + / - 5%, + / - 10%, or + / - 15% of the radial extension to the longitudinal axis LA.

[0070] By means of such a configuration of the hot air blower 10, it can be ensured that, when the hot air blower 10 is stored, the air outlet 18 is oriented such that it points away from a support surface of the hot air blower 10. In particular, this orientation allows the air flow flowing in the longitudinal direction LR from the air outlet 18 to flow horizontally and / or vertically relative to the support surface of the hot air blower 10. Therefore, the hot air blower 10 does not have to be switched off every time it is stored. It is therefore particularly suitable for multiple uses or professional operation.

[0071] In one, two, three, four, or all stable stored states of the hot air blower 10, the air outlet 18 can be aligned at least horizontally to the support surface or point upwards away from the support surface. Such a configuration is shown, for example, in Fig. 13A to 13Cshown. When placed on an upper or lower side of the hot air blower 10, the air outlet 18 points in a horizontal direction along the longitudinal direction LR.

[0072] In a further example, the hot air blower 10 can also be designed such that the air outlet 18 in a stored state always points away from a support surface of the hot air blower 18.

[0073] Furthermore, it is possible that in the hot air blower 10 placed on a support surface, at least one support edge line AKL GBA of the blower section GBA and one support edge line AKL ESA of the energy storage section ESA lie in a common plane. This is simplified in the Figures 13A , 14A and 15Ashown (without support surface). When the hot air blower 10 is placed on the corresponding support edge lines AKL GBA, AKL ESA, the air outlet 18 points away from the support surface, in particular is arranged horizontally to the support surface. Figures 13A and 15A Two support edge lines AKL GBA and AKL ESA are illustrated.

[0074] The energy storage section ESA of the hot air blower 10 in the previously described side view in Fig. 13A may further have a maximum radial extent measured from the longitudinal axis LA of the hot air blower 10, which is equal to or smaller than a maximum radial extent of the blower section GBA measured from the longitudinal axis LA in the same radial plane as the radial extent of the energy storage section.

[0075] Furthermore, Fig. 13AIt can be seen that the energy storage device 20 in the connected state can be arranged obliquely to the longitudinal axis LA of the hot air blower 10 and is detachably connected to the housing 12 at a proximal end of the handle section GA. In the further Fig. 14A In the example shown, the energy storage device 20 can also be connected to the housing 12 at the proximal end perpendicular to the longitudinal axis LA.

[0076] Furthermore, the energy storage device 20 can be connected to the housing 12 such that an upper portion extending from an imaginary center line and / or the longitudinal axis LA of the hot air device 10 and a lower portion of the energy storage device 20 correspond to 10% and 90%, 20% and 80%, 30% and 70%, or 40% and 60% of the entire energy storage device 20. As a result, the energy storage device 20 or the accumulator module described above is arranged predominantly below the handle area GA when the hot air blower 20 is used as intended, which makes the hot air blower 20 easier to hold.

[0077] In this context, the energy storage device 20 may have rounded corners, which further improves the handling of the hot air blower 20 when connected to the energy storage device 20.

[0078] In another example, the blower section GBA can be designed as a collar part. This is shown in the Figures 13A to 13C and 14A to 14C shown.

[0079] The collar portion can be round, hexagonal, or octahedral. Furthermore, it can include a ridged surface along its edge for better grip. A rubber coating on the outside of the collar portion is also possible to enable a non-slip placement of the hot air gun 20. The rubber coating also provides shock protection for the housing 12 and protection if the hot air gun 10 is dropped.

[0080] By means of the at least one adjusting means, a temperature of the air flow can be set or adjusted.

[0081] For example, the adjustment means can be designed as a dial, wherein the temperature setting or adjustment is controlled by the dial using a brake arranged in the housing 12. The brake can slow the rotation of the dial and thus prevent unwanted rotation.

[0082] The adjustment means can be arranged at a distal end of the handle portion GA so that it faces a user's field of vision. This facilitates setting and / or adjusting the temperature.

[0083] The handle portion GA can also have different design structures. For example, it can be anatomically shaped to increase the grip of the hot air gun 20.

[0084] For example, the operating switch BS can be arranged in the handle area GA, as can be seen from the Figures 13A, 13B , 14A, 14B , 15A and 15Bvisible to allow easy access for a user.

[0085] In this context, the hot air blower 10 is preferably not switched off during a work process so that the air flow maintains its temperature. The inventive design of the hot air blower 10 allows the air outlet 18 to point away from a storage surface when placed on it, or the air flow to be directed horizontally or upwards, so that no damage occurs. Therefore, the operating switch BS can also be switched off, as shown in Fig. 13A to 14B shown, arranged at a proximal end of the handle portion GA and designed as a slide switch.

Claims

1. Hot air fan (10), comprising - a housing (12) having a fan device (14) for generating an air flow, a heating device (16) for heating the air flow, an air outlet (18) at a distal end of the housing (12) in order to direct the air flow onto a workpiece; - a handle portion (GA) at a proximal end of the housing (12) in order to hold the hot air fan (10) using a hand; and - an energy storage device (20) that is releasably connected to the housing (12) for storing electrical energy and providing the electrical energy, characterised in that the housing is rod-shaped and without a gun handle and the hot air fan (10) is designed as a rigid, elongate, non-angled or non-bendable hot air rod, wherein the hot air fan is designed such that the air flow heated by the hot air fan (10) has a temperature of several hundred degrees celcius (°C).

2. Hot air fan (10) according to claim 1, characterised in that the energy storage device (20) is connected to the housing (12) in such a way that the centre of gravity of the hot air fan (10) with the energy storage device (20) connected thereto lies in the region of the handle portion (GA).

3. Hot air fan (10) according to any of the preceding claims, further comprising: - a fan portion (GBA) in which the fan device (14) and the heating device (16) are arranged; and - an energy storage portion (ESA) formed in the connected state of the energy storage device (20).

4. Hot air fan (10) according to claim 3, characterised in that a cylindrical envelope of the fan portion (GBA) produced in a longitudinal direction (LR) of the hot air fan (10) surrounds the handle portion (GA) and / or the energy storage portion (ESA).

5. Hot air fan (10) according to any of the preceding claims, characterised in that, in a placed-down state of the hot air fan (10), the air outlet (18) is oriented such that it points away from a supporting surface of the hot air fan (10).

6. Hot air fan (10) according to claim 4, characterised in that, in one, two, three, four, or all stable placed-down states of the hot air fan (10), the air outlet (18) is oriented at least horizontally to the supporting surface or points upwards away from the supporting surface.

7. Hot air fan (10) according to claim 3 to 6, characterised in that the energy storage portion (ESA) of the hot air fan (10) has a maximum radial extent, measured from a longitudinal axis (LA) of the hot air fan (10), that is less than or equal to a maximum radial extent of the fan portion (GBA), measured from the longitudinal axis (LA), in the same radial plane as the radial extent of the energy storage portion (ESA).

8. Hot air fan (10) according to claim 7, characterised in that, in the connected state, the energy storage device (20) is arranged obliquely to the longitudinal axis (LA) of the hot air fan (10) and is releasably connected to the housing (12) at a proximal end of the handle portion (GA).

9. Hot air fan (10) according to any of the preceding claims, characterised in that the fan portion (GBA) is designed as a collar part.

10. Hot air fan (10) according to claim 9, characterised in that the collar part has a round cylindrical shape, a hexagonal cylindrical shape, or an octahedral cylindrical shape, wherein a longitudinal axis of the cylinder shapes extends in a longitudinal direction (LR) of the hot air fan.

11. Hot air fan (10) according to any of the preceding claims, further comprising at least one setting means that is configured to set or adjust a temperature of the air flow.

12. Hot air fan (10) according to claim 11, characterised in that the setting means is designed as a setting wheel, wherein a setting or adjustment by the setting wheel is regulated by means of a brake arranged in the housing (12).

13. Hot air fan (10) according to claim 11 or 12, characterised in that the setting means is arranged at a distal end of the handle portion (GA) in such a way that it faces a field of view of a user.

14. Hot air fan (10) according to any of the preceding claims, characterised in that the hot air fan (10) is a handheld device, in particular a hot air rod.

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