Device for defrosting and / or defrosting mechanically moving components

Abstract

Device (1, 101) for defrosting and / or defrosting mechanically movable components, wherein the device (1, 101) has an elongated housing (10, 11, 12, 13) which has a first end and a second end, wherein a continuous air outlet opening (21) is formed at the first end and a continuous air inlet opening (22) is formed at the second end, wherein a power supply unit (31), an axial fan (35) and a heating device (37) are arranged one behind the other in the direction of an air flow inside the housing (10, 11, 12, 13), wherein the axial fan (35) conveys the air entering at the second end to the air outlet opening (21) and thus effects the air flow in such a way that the air flows around the power supply unit (31) and through the heating device (37), wherein the heating device (37) is configured in such a way is that the air flowing out through the air outlet opening (21) has a temperature T,which does not exceed a predetermined first threshold value TS1 (T ≤ TS1), wherein at least one channel (47) is provided inside the housing (10, 11, 12, 13), which extends from a first end portion of the housing (10, 11, 12, 13) with the first end to a second end portion of the housing (10, 11, 12, 13) with the second end and guides heated air from the first end portion to the second end portion of the housing (10, 11, 12, 13).

Description

[0001] The invention relates to a device for defrosting and / or defrosting mechanically movable components, wherein the device for defrosting and / or defrosting should have a small size, ie a typical pocket format.

[0002] During the cold season, problems often arise when handling mechanically movable components such as door handles, car door handles, fuel tank and tailgate flaps, folding and unfolding side mirrors, locking cylinders, mechanically movable lighting devices, or windshield wipers on vehicles (motor vehicles, commercial vehicles, agricultural vehicles) and machinery of all kinds, as these can freeze (freeze solid). This freezing usually means that the components cannot be moved as intended. The assemblies containing these movable components can then either not be used at all or require time-consuming defrosting. For this purpose, de-icing fluids are used, for example, with which the respective component is moistened to thaw it.On the one hand, such fluids may not be desired in the assembly because they impair its operation. On the other hand, there are designs of mechanically moving components that are not accessible from the outside, making it impossible to wet them with such a fluid for defrosting. Alternatively, the problem can be solved by using an ice scraper or by applying considerable force to pry apart the frozen parts. However, both options carry the risk of mechanical damage to the component(s). For example, prying open a frozen car door can damage a door seal.

[0003] There is therefore a need for a simple, cost-effective defrosting and / or defrosting device that can easily defrost / unfrost frozen, mechanically moving parts. This device should also be compact, allowing it to be easily carried and used at any time when needed.

[0004] Document DE 197 07 209 A1 discloses a device for heating and / or defrosting motor vehicle windows. This device comprises an accumulator and a fuel tank, the fuel tank containing the fuel, the combustion of which generates heat for heating and defrosting the windows. The accumulator provides the electrical energy for an ignition device. Such a device is comparatively large, making it cumbersome to use.

[0005] The object of the present invention is therefore to create a cost-effective and easily transportable device for defrosting and / or defrosting.

[0006] The above object is achieved by a device for defrosting and / or defrosting having the features of claim 1.

[0007] In particular, the above object is achieved by a device for defrosting and / or defrosting with an elongated housing which has a first end and a second end, wherein a continuous air outlet opening is formed at the first end and a continuous air inlet opening is formed at the second end, wherein a power supply unit, an axial fan and a heating device are arranged one behind the other in the direction of an air flow in the interior of the housing, wherein the axial fan conveys the air entering at the second end to the air outlet opening and thus causes the air flow in such a way that the air flows around the power supply unit and flows through the heating device, wherein the heating device is set up in such a way that the air flowing out through the air outlet opening has a temperature T which does not exceed a predetermined first threshold value TS1 (T ≤ TS1).

[0008] The defrosting and / or defrosting device according to the invention is characterized in that it effectively defrosts mechanically moving components and is also compact. The arrangement of the elements of the defrosting and / or defrosting device in the elongated housing results, on the one hand, in the small dimensions of the defrosting and / or defrosting device and, on the other hand, in the generation of a warm air flow that can quickly heat the component at which it is directed. The dimensions of the defrosting and / or defrosting device include, for example, a maximum length of 100 mm and a maximum diameter of 50 mm. The housing of the defrosting and / or defrosting device can, for example, have a substantially cylindrical shape, a conical shape, a hemispherical shape, or a shape that represents a combination of these shapes.In one embodiment, the housing has a shape such that a user can comfortably hold the defrosting and / or defrosting device in his hand and / or carry it in a trouser pocket, jacket pocket, backpack, handbag or shoulder bag of any kind.

[0009] Another important property of the defrosting and / or defrosting device is that the air flow exiting the air outlet opening of the defrosting and / or defrosting device has a temperature T that does not exceed the predefined first threshold value TS1 (T ≤ TS1). This prevents the air flow from being too high, which could injure the user, or from heating the components heated by the air flow to such an extent that they are damaged. It also prevents stress damage caused by temperature differences, which could occur if the (too) warm air flow exiting the defrosting device hits a cold component. Furthermore, this prevents the housing of the defrosting and / or defrosting device from having a temperature that could injure the user holding the defrosting and / or defrosting device in their hand.

[0010] The housing of the device for defrosting and / or defrosting provides splash water protection for the internal elements of the device. In one embodiment, the housing consists of at least two housing parts that can be detachably connected to one another, so that the device for defrosting and / or defrosting or its elements can be easily repaired and / or disposed of. The detachable connection can, for example, be a screw or bayonet connection. A seal can be arranged in the area of ​​the connection to provide better protection for the internal functional elements of the device. The housing can, for example, be made of a metal (e.g. a light metal) or a thermostable plastic.

[0011] The housing has a continuous air inlet opening at its second end and a continuous air outlet opening at its first end. Ambient air flows into the housing through the air inlet opening and is released back into the environment in a directed air jet through the air outlet opening. The air inlet opening can, for example, have a circular cross-section and a maximum diameter of 20 mm, e.g. a diameter between 10 mm and 20 mm. The air outlet opening can, for example, have a circular cross-section and a maximum diameter of 10 mm, e.g. a diameter between 5 mm and 10 mm. It is understood that the diameter of the air inlet opening and the diameter of the air outlet opening are each smaller than the outer diameter of the housing of the device for defrosting and / or defrosting in the respective end section.In one embodiment, the inner diameter of the air inlet opening DE at the second end is at least 1.5 times the inner diameter DA of the air outlet opening (i.e. DE ≥ 1.5 x DA). For example, the inner diameter of the air inlet opening at the second end is at least twice the inner diameter DA of the air outlet opening (i.e. DE ≥ 2 x DA). The axial fan arranged inside the housing determines the direction of the air flow in the housing from the air inlet opening to the air outlet opening. On its way from the air inlet opening to the air outlet opening, the air first flows past the power supply unit due to the arrangement of the elements, so that the air flows around it. In this case, the flow around includes partial or complete air flow around the power supply unit.

[0012] Behind the power supply unit (in the direction of air flow), the air enters the axial fan. The axial fan, for example, has a maximum capacity of 20 m 3 / h, for example between 0.5 m 3 / h and 10 m 3 / h, and causes the directed flow of air from the air inlet opening(s) through the interior of the housing and the directed exit of the resulting airflow from the air outlet opening of the housing. The airflow generated by the defrosting and / or defrosting device is directed at the respective iced-up components for defrosting. When the airflow hits the iced-up components, a stagnation point and turbulence are created there so that the warm air from the defrosting and / or defrosting device flows around the components and is thus optimally heated. This contributes to effective defrosting and / or defrosting so that the component(s) can be moved as intended again.

[0013] According to the invention, the device for defrosting and / or defrosting inside the housing has at least one duct which extends from a first end section of the housing to a second end section of the housing and guides heated air from the first end section to the second end section of the housing. The at least one duct has a first opening at its first duct end and a second opening at its second, opposite duct end. The first end section is a section of the housing which encloses the first end of the housing and which can, for example, also comprise the first housing part. The first duct end lies behind the heating device with the heating element in the direction of the air flowing through the housing.The second duct end is located, in the direction of the air flowing through the housing, behind the air inlet opening at the second end and, in one embodiment, behind the air inlet opening, for example behind the further air inlet openings provided in the side wall of the housing in addition to the air inlet opening at the second end, and in front of the axial fan. This at least one duct of the defrosting and / or defrosting device includes a unique energy optimization function, which is advantageous since the defrosting and / or defrosting device is naturally used at temperatures close to and below 0 °C. A portion of the air heated by the heating device (e.g., at least 10% of the air flow) is redirected into the intake stream of the cold air, mixes the intake cold air, and thus significantly heats the intake cold air. This can increase the temperature of the incoming air by, for example, 15 °C to 25 °C.This is advantageous because it can increase the temperature-dependent capacity of the power supply unit, e.g. the battery, by 20%, for example. Furthermore, the at least one channel reduces the electrical power required by the heating device to heat the air flow. In addition, the interior of the housing with the electronics assembly is dried by the warm air flow, so that condensation of moisture in the device housing can be ruled out. The physical principle behind this effect works as follows. The work of the axial fan creates an area with a slight overpressure (in the direction of the air flow after the axial fan) and an area with a slight underpressure (in the direction of the air flow before the axial fan).The at least one channel connects the first end section and the second end section, wherein on the pressure side the heated air can flow into the channel via the first opening. The "Venturi" principle is used in the channel to return the heated air in the direction of the air flowing in through the air inlet opening. Due to the pressure difference between the first end section and the second end section, warm air is sucked in from the first end section and introduced into the cold air flow entering the housing from the outside, in the region of the second end section. This automatically creates a return flow of a portion of the heated air via the at least one channel. The at least one channel can have an inner diameter of at least 1 mm. For example, the inner diameter can be in the range 1 mm to 10 mm, for example in the range 1 mm to 5 mm.In one embodiment, two or more than two channels can be provided. The at least one channel can be arranged, for example, on the inner wall of the housing. The channel can, for example, run parallel to a surface line on the outer wall of the housing. In one embodiment, the at least one channel is closed at both ends except for the first opening and the second opening.

[0014] As already explained above, the flowing air passes the heating device after the axial fan. The air flows through the heating device, which has a heating element, for example, a heating coil. The heating device, in particular the heating element, heats the air to a temperature T that does not exceed the predetermined first threshold value TS1. The heating device can, for example, be configured for a supply voltage of 5 V to 12 V.

[0015] The axial fan and the heating device of the defrosting and / or defrosting device, for example, are electrically connected to the power supply unit within the housing. The power supply unit supplies these functional elements with electrical voltage for their operation.

[0016] In one embodiment, the heating device has a heating element and a shutdown device that switches off the heating element when the temperature of the air flowing out through the air outlet opening exceeds the predetermined first threshold value TS1. For example, the shutdown device has a bimetallic element that interrupts the power supply to the heating element when the first threshold value TS1 is exceeded and restores the power supply when the temperature falls below a second threshold value TS2 (TS2 < TS1). Alternatively or additionally, the heating device can have a temperature measuring device that measures the temperature of the air flowing out of the outlet opening. In this case, a control device can also be provided that regulates the voltage supply to the heating device based on the temperature measurement value determined by the temperature measuring device.Furthermore, it is possible to limit the switching off of the heating element for a specific period of time (e.g. to several seconds) and to switch it on again after a predetermined period of time has elapsed after switching it off, if the (entire) device for defrosting and / or defrosting is still switched on.

[0017] In one embodiment, the device for defrosting and / or defrosting has an electronic assembly which is arranged in the direction of the air flow, for example between the axial fan and the power supply unit, such that the air flows around it. The electronic assembly can, for example, have electronic components for controlling or regulating the heating device and / or the power supply device. The electronic assembly is electrically connected to the power supply unit. The electronic assembly can have a switching device, e.g. an automatic push-button or slide switch. Furthermore, the electronic assembly can include electrical connections to the power supply unit and / or to the axial fan and / or to the heating device. Furthermore, the electronic assembly can have a temperature-dependent voltage interruption, for example a bimetallic element connected to a relay.In one embodiment, this relay interrupts the power supply to the heating device when the first threshold value TS1 is exceeded, so that the axial fan then flows cold air through the inside of the housing and the device cools down quickly. For example, wiring in the device and in the electronics assembly can be implemented using screw and / or solder connections. In the electronics assembly, the relay or a direct bimetallic switch on a circuit board carrier can be connected to the wiring of the heating device's power supply. Furthermore, electronic components can be provided for connecting a charging socket for wired charging of the battery and / or an inductive coil for wireless charging of the battery, as well as a charge level indicator, to the battery / power supply unit.

[0018] In one embodiment, a filter device is arranged behind the air inlet opening in the direction of the air flow, e.g. directly behind the air inlet opening. The filter device comprises, for example, a moisture-absorbing material, e.g. a polymer-cotton blend, in order to filter out dust and moisture from the intake air. In one embodiment, the filter device can be designed to be replaceable. The filter device can, for example, consist of a round cut-to-size filter that is large enough to be inserted precisely into a circumferential groove in the inner wall of the housing of the device. To make replacing the filter easier, this circumferential groove could be located in a housing part that is detachably connected to another housing part.For example, the housing section with the circumferential groove for the filter device could be arranged at the second end section of the housing, where the air inlet opening is also located. The thickness of the filter can be, for example, a maximum of 10 mm, for example, between 3 mm and 10 mm. In one embodiment, the filter device can be designed to meet filter class G2-G4. The filter material can, for example, be washable, so that it can be used multiple times.

[0019] In one embodiment, the power supply unit is a battery or a rechargeable accumulator (hereinafter referred to as battery), which supplies, for example, a supply voltage of 5 V to 12 V. For wired charging, the battery can in one embodiment be electrically connected to a socket via which the battery can be charged. Such a socket can be arranged on the outside of the housing so that it is accessible from the outside. The socket can be a USB-C socket, for example. Accordingly, the device for defrosting and / or heating can be provided with a USB-C charging cable as a package insert upon delivery. Alternatively or additionally, the battery can be configured for inductive charging (wireless charging). In one embodiment, the power supply unit can be connected to an optical charge level indicator and / or an optical charging process indicator of the power supply unit.The optical charge level indicator and the optical charging process indicator are arranged on the outside of the housing and are visible to the user. Using the charge level indicator, the user can read the charge level of the power supply unit. The charging process indicator allows the battery charging process to be observed (e.g., its start and / or continuation). These indicators can be implemented, for example, using one or more LEDs. In a further exemplary embodiment, the power supply unit can have a push-button switch or slide switch that must be constantly pressed or moved by the user in order to keep the device for defrosting and / or defrosting in the switched-on state, with the respective switch automatically returning to the idle state (i.e., the switched-off state) (e.g., due to a spring force). This allows energy stored in the power supply unit to be saved.The push button switch or slide switch can be lockable or non-lockable.

[0020] In one embodiment, the diameter of an air flow channel decreases continuously or discontinuously. The flow channel begins in the direction of the air flow inside the housing directly behind the axial fan and extends to the heating device. This creates a nozzle effect that advantageously changes the air flow. In particular, the air flow is focused on the heating device, allowing the air to be effectively heated. Furthermore, the resulting increase in flow velocity results in better turbulence and thus more effective heating of the component onto which the air flow exiting the defrosting and / or defrosting device is directed.

[0021] In one embodiment, a plurality of further through-passing air inlet openings are provided in the casing at the second end of the housing, through which air enters the interior of the housing. The further through-passing air inlet openings provided in the wall or casing of the housing at the second end allow a larger amount of air to enter the interior of the housing. This air is also conveyed towards the air outlet opening by means of the axial fan. Accordingly, a larger amount of air is available at the air outlet opening for defrosting. Each of these through-passing openings, which can have a circular cross-section, can, for example, have an inner diameter of a maximum of 5 mm. For example, these further air inlet openings can be arranged in a second housing part, in the direction of air flow, upstream of a filter device (see below).

[0022] Further advantages, features, and possible applications of the invention are described below with reference to exemplary embodiments and the figures. All described and / or illustrated features form the subject matter of the present invention, regardless of their summary in the claims and their references.

[0023] They show schematically: Fig. 1 a first embodiment of the device for defrosting and / or defrosting in a perspective view from the side, Fig. 2 the device for defrosting and / or defrosting according to Fig. 1 in a schematic diagram in a partial longitudinal section, which illustrates the arrangement of the functional elements of the device in the housing, Fig. 3 the device for defrosting and / or defrosting according to Fig. 1 in a side view, Fig. 4 the device for defrosting and / or defrosting according to Fig. 1 in a perspective view from below, Fig. 5 the device for defrosting and / or defrosting according to Fig. 1 in a view from above and Fig. 6 a second embodiment of the device for defrosting and / or defrosting in a schematic diagram in a partial longitudinal section, which illustrates the arrangement of the functional elements of the device in the housing.

[0024] The Fig. The exemplary embodiment of a defrosting and / or defrosting device 1 according to the invention shown in Figures 1 to 5 comprises a housing 10 composed of a first housing part 11, a second, central housing part 12, and a third housing part 13. The first housing part 11 forms the first end section of the housing 10, and the third housing part 13 forms the second end section of the housing 10. The first housing part 11, the second housing part 12, and the third housing part 13 are detachably connected to one another, for example by means of screw connections. This makes it possible for non-functioning elements of the defrosting and / or defrosting device 1 to be replaced and disposed of separately according to material.

[0025] The first end of the housing is formed at the end of the first housing part 11 opposite the second housing part 12. Accordingly, the second end of the housing 10 is formed at the end of the second housing part 12 opposite the second housing part 12. At the first end of the housing 10, a continuous air outlet opening 21 (see, for example, Fig. 1, Fig. 2 and Fig. 3) and at the second end of the housing 10 a continuous air inlet opening 22 (see for example Fig. 3). Through the air inlet opening 22, air from the environment enters the interior of the housing 10 and is conveyed by an axial fan 35 to the air outlet opening 21, where the air leaves the housing 10 again. The air inlet opening 22 has, for example, a diameter DE of 15 mm (see Fig. 4) and the air outlet opening 21 has a diameter DA of 3 mm to 5 mm (see Fig. 5).

[0026] At the end of the third housing part 13 adjacent to the second housing part 12, a plurality of further continuous air inlet openings 24 are provided, through which additional air flows into the housing 10. This air is also conveyed to the air outlet opening 21 by means of the axial fan 35.

[0027] Inside the housing there are a number of functional elements that are Fig. 2 are shown in more detail. Fig. 2, the first housing part 11 and the second housing part 12 are shown in a longitudinal section, while the third housing part 13 is shown closed. In the flow direction of the air flowing in the housing 10, which in Fig. 2 by means of the arrow 25, a power supply unit in the form of a battery 31, an electronic assembly 33, the axial fan 35, and a heating device 37 are arranged one after the other in the housing 10. The battery 31, the electronic assembly 33, the axial fan 35, and the heating device 37 are mounted in the housing 10 and electrically connected to one another such that the battery 31 supplies the other elements with a predetermined voltage. As already explained above, the axial fan 35, which, for example, has a power of 10 m 3 / h, to convey the air through the housing 10 in the flow direction (illustrated by arrow 25). The air is guided past the battery 31 and the electronics assembly 33, so that the air flows around the battery 31 and the electronics assembly 33. In the flow direction behind the axial fan 35, the wall of the housing 10 (for example the wall of the second housing part 12) is designed such that the diameter measured between opposite inner walls 38 (DK, see Fig. 2) continuously decreases in the direction of flow. In other words, the inner wall 38 of the second housing part 12 is conical in this section. This focuses the flow toward the heating device 37 with a heating element in the form of a heating coil 40, and the flow velocity increases, effectively heating the air in the area of ​​the heating coil 40. The air heated by the heating device 37 then exits the air outlet opening 21.

[0028] The Fig. From the side view shown in Figure 3, it can be seen that the defrosting and / or defrosting device 1 has a pressure switch 41 that is electrically connected to the electronic assembly 33. To turn on the defrosting and / or defrosting device 1, the user continuously presses the pressure switch 41.

[0029] For use, the defrosting and / or defrosting device 1 is held in the user's hand and switched on by continuously pressing the push button 41. The user also directs the air flow exiting the defrosting and / or defrosting device 1 through the air outlet 21 onto the component to be defrosted. The air flow strikes the component to be defrosted (not shown) and is swirled there. As a result, the warm air flows around the component and heats it, thus defrosting it.

[0030] The defrosting and / or defrosting device 1 also has a USB-C socket 43 into which a charging cable for charging the battery 31 can be plugged. The charging cable is included with the defrosting and / or defrosting device 1. Alternatively, the battery 31 can be designed such that it can be inductively charged in a known manner. To inform the user about the charge level of the battery 31, the defrosting and / or defrosting device 1 has a charge level indicator 45. This is implemented, for example, by means of three LEDs arranged one above the other in the housing, which the user can observe through corresponding small openings in the housing 10. In one embodiment, the charge level indicator 45 can also indicate to the user that the battery 31 is currently being charged during charging of the battery 31, for example by the LEDs flashing one after the other.When fully charged, the charge level indicator 45 can also display this by means of a corresponding light pattern.

[0031] The defrosting and / or defrosting device 1 also has a filter device (not shown) in the form of a round filter blank made of a polymer-cotton blend, which is arranged in a circumferential groove in the interior of the third housing part 13. For example, the circumferential groove can be arranged at the end of the third housing part 13 opposite the air inlet opening 22. The filter blank can be replaced when the third housing part 13 has been detached from the second housing part 12 (e.g., by screwing it off). In one embodiment, the filter blank is washable and can therefore be reused after washing. The filter device reduces the penetration of water and dust into the housing of the defrosting and / or defrosting device 1.

[0032] The Fig. The second embodiment of a device for defrosting and / or defrosting 101 shown in Figure 6 has essentially the same structure as the first embodiment, which is shown in Figure 6 in FIG. Fig. 1 to 5. Like reference numerals denote like elements. Regarding these elements, reference is made to the above explanations of the first embodiment of the device.

[0033] The second exemplary embodiment has two channels 47 on the inside of the second housing part 12, each with an inner diameter of 2 mm, which channels extend parallel to the direction of air flow in the housing along the entire length of the second housing part 12. Each channel 47 has a first opening 46 at its first end and a second opening 48 at its second end. Between the openings 46, 48, each channel 47 is closed. Due to the pressure difference generated by the axial fan 35, warm air from the area behind the heating device 37 in the direction of flow is directed into the second end section of the housing, where it is mixed with the incoming cold air. For this purpose, each channel 47 has a first opening 46 through which the warm air enters the channel 47, and a second opening 48 through which the warm air can escape from the channel 47.As a result, the cold air entering the housing through the air inlet opening 22 and possibly also through the further air inlet openings 24 can be mixed with the warm air and thus preheated overall.

[0034] The device can be used for defrosting or defrosting mechanically moving parts such as door handles, fuel tank and loading flaps in motor vehicles, automatically folding and unfolding side mirrors, locking cylinders, hinges, gaps (seals on automatically lowering windows, trunk lids, hoods, doors) or flap systems of all kinds. The defrosting and / or defrosting device 1 is particularly useful in vehicles during the cold season, for example for motor vehicles, agricultural vehicles, machinery or two-wheelers. However, the defrosting and / or defrosting device 1 according to the invention can also be used for other machines and devices, for example for defrosting electrical connections, electronic and mechanical plug units, drive units, locking devices (e.g. on ski boots), seals, rubber parts and frozen gaps.The defrosting and / or defrosting device 1 according to the invention can also be used for preheating mechanical or electrical components or units for improved operation, separation or efficiency improvement.

Claims

[1] Device (1, 101) for defrosting and / or defrosting mechanically movable components, wherein the device (1, 101) has an elongated housing (10, 11, 12, 13) which has a first end and a second end, wherein a continuous air outlet opening (21) is formed at the first end and a continuous air inlet opening (22) is formed at the second end, wherein a power supply unit (31), an axial fan (35) and a heating device (37) are arranged one behind the other in the direction of an air flow inside the housing (10, 11, 12, 13), wherein the axial fan (35) conveys the air entering at the second end to the air outlet opening (21) and thus effects the air flow in such a way that the air flows around the power supply unit (31) and through the heating device (37), wherein the heating device (37) is arranged such that the air flowing out through the air outlet opening (21) has a temperature T,which does not exceed a predetermined first threshold value TS1 (T ≤ TS1), wherein at least one channel (47) is provided inside the housing (10, 11, 12, 13), which extends from a first end portion of the housing (10, 11, 12, 13) with the first end to a second end portion of the housing (10, 11, 12, 13) with the second end and guides heated air from the first end portion to the second end portion of the housing (10, 11, 12, 13). [2] Device (1, 101) according to claim 1, characterized by that the heating device (37) has a heating element and a switch-off device which switches off the heating element when the temperature of the air flowing out through the air outlet opening exceeds the predetermined first threshold value TS1. [3] Device (1, 101) according to one of the preceding claims, characterized bythat it has an electronic assembly (33) which is arranged in the direction of the air flow between the axial fan (35) and the power supply unit (31) in such a way that the air flows around it. [4] Device (1, 101) according to one of the preceding claims, characterized by that a filter device is arranged in the direction of the air flow behind the air inlet opening (22), for example directly behind the air inlet opening (22). [5] Device (1, 101) according to one of the preceding claims, characterized by that the power supply unit (31) is a battery or a rechargeable battery. [6] Device (1, 101) according to one of the preceding claims, characterized bythat the diameter (DK) of the flow channel for the air, wherein the flow channel begins in the direction of the air flow inside the housing (10, 11, 12, 13) directly behind the axial fan (35) and extends to the heating device (37), decreases continuously or discontinuously. [7] Device (1, 101) according to one of the preceding claims, characterized by that in an end section at the second end of the housing (10, 11, 12, 13) in the shell of the housing (10, 11, 12, 13) a plurality of further through openings are provided through which air reaches the interior of the housing (10, 11, 12, 13). [8] Device (1, 101) according to one of the preceding claims, characterized by that it has an optical charge level indicator (45) and / or an optical charging process indicator of the energy supply unit (31). [9] Device (1, 101) according to one of the preceding claims, characterized bythat the housing (10) consists of at least two housing parts (11, 12, 13) which can be releasably connected to one another.

Images