Hot air handheld device

Abstract

The present disclosure relates to a handheld hot air device (1), comprising a housing (2) for receiving at least one blower (6), a control device (11), operating elements and a display and operating device (4), and a heating tube (7) located on the housing (2), wherein the heating tube has an integrated heating element (9) and a temperature sensor (12). The present disclosure is characterized in that a calibration characteristic line is stored in the control device (11) according to a plurality of different air flow possibilities for the hot air discharged from the heating tube (7) before the heating tube (7), so that after determining the corresponding air flow after discharge from the heating tube (7), the control device (11) outputs the air temperature at the location corresponding to the air flow on the display (4) according to the calibration characteristic line of the air flow. The present disclosure also relates to a corresponding method for operating the handheld hot air device (1).

Description

Technical Field

[0001] The invention relates to a handheld hot air device having a housing for accommodating at least one blower, a control device, operating elements and a display and operating device, and a heating tube located on the housing, the heating tube having an integrated heating element and a temperature sensor. Background Art

[0002] Such hot air handheld devices are generally known and are used in various designs, for example, for welding or shrinking plastics, drying objects, and the like.

[0003] DE 10 2019 100 850 A1 relates to a hot air blower and a method for operating the same. This publication discloses a hot air blower comprising a blower device for generating an air flow, a heating device for heating the air flow, and a control unit connected to the blower device and the heating device. The control unit is configured to regulate or control the blower device such that, when the heating device is switched on, the blower device generates an initial air flow that is reduced relative to the operating air flow. Furthermore, a method for operating the hot air blower is provided, comprising the steps of switching on the heating device and generating an initial air flow that is reduced relative to the operating air flow.

[0004] DE 10 2020 200799 A1 relates to a distance heating device, in particular a heat gun device, comprising a heat output unit for heating a surface, a sensor unit for determining at least one information item about the surface, and a control unit for controlling at least the heat output unit. It is proposed that the information item has at least one component that differs from the surface temperature of the surface, and that the control unit triggers at least one function based on the information item in at least one operating state.

[0005] EP 1 956 317 A2 relates to a heating device and a method, wherein a heating device (such as a heat gun or a heating unit) has a surface temperature sensor for measuring the surface temperature of a workpiece to be heated.

[0006] JP S61 217648A relates to another heat gun having a temperature sensor.

[0007] DE 20 2017 103466 U1 relates to a hot air handheld device with a contactless user communication interface.

[0008] Especially when used as a hot air welding device, it is important to know the temperature at the point where welding is performed. This is typically at a specific distance before the outlet opening of the hot air heating tube. Furthermore, the hot air volume must be taken into account, which can often vary with these hot air devices. To monitor the temperature, a temperature sensor is located in the heating tube between the heating element and the outlet opening, particularly directly at the end of the heating element. In particular, in industries with extremely high demands on process traceability and accuracy, such as the transportation industry, and particularly in the aircraft industry, when using such temperature-controlled handheld hot air devices, it is necessary that the temperature displayed by the handheld hot air device also corresponds to the actual operating (welding / shrinking) temperature. When the air is discharged from the heating tube, the temperature is already lower than the temperature at the measurement point in the air flow shortly after the heating element due to heat losses. For this purpose, a calibration characteristic curve is stored in the control device that regulates the hot air temperature, so that the actual temperature at the air outlet can be calculated from the temperature measured by the sensor. A linear relationship is assumed for this purpose, and the slope and offset are determined and stored from two measurement points. Only the determined temperature is then shown on the display of the hot air handheld device.

[0009] For example, when different nozzles are placed on a heating pipe, the temperature at the location where welding is to be performed varies depending on the nozzle. Even if welding is performed at a different location at a different distance from the outlet of the heating pipe, the displayed temperature will not match the actual temperature at the work site for any reason. Summary of the Invention

[0010] The present invention is therefore based on the object of providing a possibility with which the actual temperature at a defined point upstream of the heating tube can be displayed for any application.

[0011] The subject matter claimed for protection is defined in the dependent claims. Advantageous embodiments are described in the dependent claims.

[0012] According to one aspect of the present disclosure, calibration characteristic lines are stored in the control device for a plurality of different air flow options upstream of the heating pipe for the hot air discharged from the heating pipe. The handheld hot air device with the control unit is configured to, after determining the corresponding air flow after the hot air is discharged from the heating pipe, output the air temperature at the location corresponding to the air flow on a display according to the calibration characteristic lines for the air flow. These calibration characteristic lines are linearly determined, for example, by taking corresponding measurements at a predetermined air volume using lower and upper temperature values, and are stored for the corresponding air flow options. Typically, this is done for a total of four values ​​(upper and lower temperature values ​​for upper and lower air volumes). Thus, after the user has selected the corresponding application, a display of the temperature at a specific distance upstream of the heating pipe, corresponding to the actual conditions, can be displayed for different nozzles or without a nozzle.

[0013] Accordingly, the method for operating the hot air handheld device according to the present invention may have the following steps: providing the hot air handheld device; determining the air diversion after being discharged from the heating tube, wherein (a) a calibration characteristic line is stored in the control device according to a plurality of different air diversion possibilities for the hot air discharged from the heating tube before the heating tube; or instead of the plurality of calibration characteristic lines stored in the control device, these calibration characteristic lines are stored on a mobile communication device, and the corresponding selected calibration characteristic line can be loaded from the mobile communication device to the control device via a communication interface; and the air temperature at the position corresponding to the air diversion is output on the display according to the calibration characteristic line of the air diversion.

[0014] Preferably, a calibration characteristic curve is stored in the control device depending on the nozzle that can be plugged onto the heating tube.

[0015] According to a particularly preferred structural solution of the present invention, a communication interface for wireless communication is provided in the hot air handheld device for wirelessly transmitting data from and to a mobile communication device. In principle, the display of multiple air guide possibilities and their selection can be realized via a display device. Here, different air guide possibilities are presented on a display at the mobile communication device and can be selected by an operator. The calibration characteristic line corresponding to the air guide possibility may have been stored in the control device of the hot air handheld device and selected via the communication device. Alternatively, the calibration characteristic line is stored on the mobile communication device, selected there, and the selected calibration characteristic line is transmitted to the control device and stored there for the application. Preferably, according to another structural solution, the calibration characteristic line stored on the mobile communication device is loaded from the mobile communication device to the control device.

[0016] According to a particularly preferred embodiment of the handheld hot air device, it is possible to calculate a new calibration characteristic from the measured temperature values ​​at locations relevant for the respective air flow, given the corresponding assigned air volume, using a formula stored in the communication device. As described above, the new calibration characteristic can then be transmitted to the control device and stored there for use in the application. This design is particularly advantageous if either a new nozzle is to be used (for which no calibration characteristic exists) or the temperature at a very specific location upstream of the heating tube is relevant and therefore adjustable and should be displayed. Alternatively, it is also possible to store the formula in the control device and transmit only the measured values ​​from the communication device to the control device.

[0017] For this purpose, the temperature at the desired location can be determined using an external temperature probe, which is either connected to a corresponding display so that the data can be input into the mobile communication device for calculating the calibration characteristic, or is directly connected to the mobile communication device. This feature also makes it possible for the user to determine his calibration characteristic precisely for the temperature range in which he typically operates the hot air handheld device.

[0018] The hot air handheld device according to the invention thus allows simple adaptation to different applications, regardless of whether these were already taken into account when the hot air handheld device was delivered. Either an existing calibration characteristic can be used or a new calibration characteristic can be created using additional measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features and feature combinations mentioned above in the description and the features and feature combinations mentioned below in the description of the figures and / or shown individually in the figures can be used not only in the respectively given combination, but also in other combinations or individually. The individual features of the independent claims can also be replaced by other disclosed features or feature combinations. All features and / or advantages derived from the claims, the description or the figures, including design details, spatial arrangements and method steps, can be important to the invention not only by themselves but also in different combinations. The following figures:

[0020] Figure 1 showing a perspective view of a hot air handheld device with a nozzle placed on a heating tube, the hot air handheld device communicating with a mobile telecommunication device;

[0021] Figure 2 Shown through the Figure 1 a cross-sectional view of a hot air handheld device, wherein a schematic diagram of the electrical communication path is provided as a block diagram; and

[0022] Figure 3 The arrangement when acquiring a new calibration characteristic line is shown;

[0023] Figure 4 A flow chart of a method for operating a hot air handheld device is shown. DETAILED DESCRIPTION

[0024] Figure 1 The hot air handheld device 1 shown in FIG is a hot air handheld device 1 that is common in appearance. The hot air handheld device has a housing 2, a handle 3, a display and operating device 4 in the form of an input screen, and an on switch 5 ( Figure 2 A blower 6 is provided inside the housing 2 ( Figure 2 ), the air is drawn out through the blower through the heating pipe 7 and the nozzle 8 plugged into the heating pipe 7. Figure 2 , a heating element 9 is provided inside. This embodiment shows the operation of the hot air handheld device 1 by means of a mobile telecommunication device 10 having a display screen 14. Without the mobile telecommunication device, the hot air handheld device can be operated accordingly via the display 4, which is also configured as an input screen.

[0025] exist Figure 2 The diagram schematically shows a control circuit with a control device 11, which receives signals from a sensor 12 at the hot-air-side end of the heating element 9. A linear calibration characteristic curve is stored in the control device 11, which assigns the actual temperature value displayed on the display 4 to the corresponding measured value of the sensor 12. The calibration characteristic curve is also influenced by the corresponding air volume, resulting in a different calibration characteristic curve depending on the air volume. Therefore, the control device 11 also controls and regulates the blower 6 and outputs the corresponding temperature on the display 4. The control device 11 also controls and regulates the heating element 9. When used with a mobile telecommunication device 10, the control device 11 also includes a telecommunication interface for communicating with the mobile telecommunication device 10. Therefore, instead of displaying it on the input screen 4, all possible stored calibration characteristics can be presented to the operator on the telecommunication device 10 for selection, for example, by corresponding symbols for the nozzle or the distance from the outlet end of the heating tube 7. The operator then selects the calibration characteristic curve stored in the control device 11 for the application and transmits a selection signal to the telecommunication interface. This design of the hot air device with a communication interface also allows the corresponding calibration characteristic lines to be stored not entirely in the control device 11 but on the mobile telecommunication device 10 and only the corresponding application to be transferred to the control device 11 and stored there.

[0026] exist Figure 3, an additional temperature sensor 13 is shown, which is used to determine the temperature of a new nozzle 8 and transmit it to the mobile telecommunication device 10. By recording the temperature values ​​for a specific air volume, the calibration characteristic curve required for this application can be calculated using a calculation formula stored in the mobile telecommunication device 10, transmitted to the control device 11, and stored there. Thus, new application situations can also be taken into account with an accurate temperature display. In principle, it is also conceivable to manually enter the temperature measured by the sensor 13 into the telecommunication device 10.

[0027] exist Figure 4 shows a flow chart of a method 100 for operating a handheld hot air device. In a first step S101, a handheld hot air device 1 is provided. The handheld hot air device may be the handheld hot air device described above. In step S102, an air flow after exiting the heating tube 7 is determined (or preset or specified), wherein: (a) calibration characteristic lines are stored in the control device 11 based on a plurality of different air flow possibilities for the hot air exiting the heating tube 7 before the heating tube 7; or (b) instead of the plurality of calibration characteristic lines stored in the control device 11, these calibration characteristic lines are stored in the mobile communication device 10, and the corresponding selected calibration characteristic line can be loaded from the mobile communication device 10 to the control device 11 via a communication interface. In other words, the calibration characteristic lines are alternatively stored on the mobile communication device and selected there, and the selected calibration characteristic line is transmitted to the control device and stored there for use in the application. In step S103, the air temperature at the location corresponding to the air flow is output on the display 4 based on the calibration characteristic line for the air flow.

Claims

1. A handheld hot air device (1), comprising a housing (2) for accommodating at least one blower (6), a control device (11), operating elements and a display and operating device (4), and a heating tube (7) located on the housing (2), the heating tube having an integrated heating element (9) and a temperature sensor (12), characterized in that: A calibration characteristic line is stored in the control device (11) based on a plurality of different air flow possibilities for the hot air discharged from the heating tube (7) before the heating tube (7), and the hot air handheld device (1) with the control device (11) is configured to output the air temperature at a location corresponding to the air flow on the display and operating device (4) based on the calibration characteristic line of the air flow after determining the corresponding air flow after the hot air is discharged from the heating tube (7).

2. The hot air handheld device (1) according to claim 1, characterized in that A calibration characteristic line is stored in the control device (11) according to a nozzle (8) that can be plugged into the heating tube (7), and the hot air handheld device (1) with the control device (11) is configured to output the air temperature at the outlet of the nozzle (8) on the display and operating device (4) according to the calibration characteristic line of the nozzle (8) used after determining the nozzle (8) used.

3. A system comprising a hot air handheld device (1) according to claim 1 or 2 and a mobile communication device (10), characterized in that The hot air handheld device (1) has a communication interface for wireless communication for wirelessly transmitting data from and to the mobile communication device (10), wherein a calibration characteristic line corresponding to the air guidance possibility is displayed on a display and operating device (4) on the mobile communication device (10) and can be selected.

4. The system according to claim 3, characterized in that A calibration characteristic line stored on the mobile communication device (10) can be loaded from the mobile communication device (10) to the control device (11).

5. A system comprising a hot air handheld device (1) according to claim 1 or 2 and a mobile communication device (10), characterized in that The hot air handheld device (1) has a communication interface for wireless communication for wirelessly transmitting data from and to the mobile communication device (10), wherein the temperature values ​​measured at locations relevant for the respective air guidance in the case of the corresponding assigned air volume can be loaded from the mobile communication device (10) to the control device (11), which calculates and stores a new calibration characteristic line based on a formula stored therein.

6. A system comprising a hot air handheld device (1) according to claim 1 or 2 and a mobile communication device (10), characterized in that Instead of a plurality of calibration characteristic lines being stored in the control device (11) of the hot air handheld device (1), the calibration characteristic lines are stored on a mobile communication device (10), and corresponding selected calibration characteristic lines can be loaded from the mobile communication device (10) to the control device (11) via a communication interface.

7. The system according to claim 6, characterized in that The mobile communication device (10) calculates and stores a new calibration characteristic line from measured temperature values ​​at locations relevant for the respective air guidance at the respective associated air volumes using a formula stored in the mobile communication device (10).

8. A handheld hot air device (1), comprising a housing (2) for receiving at least one blower (6), a control device (11), operating elements and a display and operating device (4), and a heating tube (7) located on the housing (2), the heating tube having an integrated heating element (9) and a temperature sensor (12), characterized in that: The hot air handheld device (1) with the control device (11) is configured to output the air temperature corresponding to the location of the air diversion on the display and operating device (4) according to a calibration characteristic line of the air diversion after determining the corresponding air diversion after the hot air is discharged from the heating tube (7), wherein the hot air handheld device (1) has a communication interface for wireless communication for wirelessly transmitting data from and to a mobile communication device (10), wherein calibration characteristic lines are stored on the mobile communication device (10) according to a plurality of different air diversion possibilities for the hot air discharged from the heating tube (7) before the heating tube (7), and the hot air handheld device (1) is configured to load the corresponding selected calibration characteristic lines from the mobile communication device (10) to the control device (11) via the communication interface.

9. A method (100) for operating a hot air handheld device (1) according to any one of the preceding claims 1, 2 or 8, comprising the following steps: - providing the hot air handheld device (1) (S101); - determining the air flow after exiting the heating tube (7), wherein: A calibration characteristic line (S102) is stored in the control device (11) based on a plurality of different air flow guidance possibilities for the hot air discharged from the heating tube (7) before the heating tube (7); and - outputting the air temperature at a location corresponding to the air guidance on the display and operating device (4) based on the calibration characteristic line of the air guidance (S103).

10. A method (100) for operating a hot air handheld device (1) according to any one of the preceding claims 1, 2 or 8, comprising the following steps: - providing the hot air handheld device (1) (S101); - determining the air flow after exiting the heating tube (7), wherein: Calibration characteristic lines are stored on the mobile communication device (10) based on a plurality of different air flow guidance possibilities for the hot air discharged from the heating tube (7) before the heating tube (7), and the corresponding selected calibration characteristic lines can be loaded from the mobile communication device (10) to the control device (11) via a communication interface (S102); and - outputting the air temperature at a location corresponding to the air guidance on the display and operating device (4) based on the calibration characteristic line of the air guidance (S103).

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