EP2573481A2 - Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique - Google Patents

Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique Download PDF

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Publication number
EP2573481A2
EP2573481A2 EP11188275A EP11188275A EP2573481A2 EP 2573481 A2 EP2573481 A2 EP 2573481A2 EP 11188275 A EP11188275 A EP 11188275A EP 11188275 A EP11188275 A EP 11188275A EP 2573481 A2 EP2573481 A2 EP 2573481A2
Authority
EP
European Patent Office
Prior art keywords
hot air
measuring device
air blower
temperature
measuring
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.)
Ceased
Application number
EP11188275A
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German (de)
English (en)
Other versions
EP2573481A3 (fr
Inventor
Ingo Heinrich Steinel
Thomas Möller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Steinel GmbH and Co KG
Original Assignee
Steinel GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Steinel GmbH and Co KG filed Critical Steinel GmbH and Co KG
Priority to EP11188275.9A priority Critical patent/EP2573481A3/fr
Publication of EP2573481A2 publication Critical patent/EP2573481A2/fr
Publication of EP2573481A3 publication Critical patent/EP2573481A3/fr
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns

Definitions

  • the invention relates to a pyrometric measuring device according to claim 1, a, preferably designed as a hot air gun, hot air blower with an associated pyrometric measuring device according to claim 13 and the use of a pyrometric measuring device according to claim 14.
  • Measuring devices for non-contact temperature detection are known from the prior art, commercially available measuring devices either based on the pyroelectric principle temperature sensors (so-called pyro-sensors) or based on the thermoelectric principle temperature sensors (so-called thermopile sensors).
  • the pyroelectric effect is based on the change in the electrical charge in a crystal due to temperature change
  • the thermoelectric effect as a counterpart to the Peltier effect is based on the principle of temperature-dependent voltage generation by usually a plurality of series-connected thermocouples.
  • the overall arrangement is usually sensitive in the infrared range.
  • Known measuring devices are independent devices which are often distinguished by a pistol-type handle, in any case have a gripping surface for comparatively comfortable carrying or handling.
  • Hot air blowers are electric hand tools with which the surface of an object in a work area can be specifically heated.
  • Known hot air guns are characterized by an elongated, often tubular portion, the end of a hot air outlet, which usually from a hot air nozzle is formed. Angled to this section is a grip area that gives the gun or mold the hot air blower.
  • a fan is provided in the hot air gun housing, is sucked with the ambient air, which is then heated by a heating element and blown through the hot air outlet of an outlet pipe.
  • the air flow rate differs depending on the design and is often between about 150 to 500 l / min, with temperatures often in a range between about 50 ° C and 650 ° C can be set - usually temperatures above 200 ° C.
  • Hot air guns can introduce heat into an object, for example compared to a blowtorch without a flame, it is possible to process flammable materials with less danger potential.
  • Hot air guns can be used for a variety of applications, such as plastic deformation, welding plastics, removing paint or paint layers, desoldering, disinfecting, drying, deicing or lighting.
  • High-quality hot air gun models today partly include a temperature display, which indicates the temperature of the hot air being blown out. For the user, no direct inference of the temperature of the heated surface is possible from this. This is particularly problematic in comparatively sensitive surfaces in which a defined maximum temperature must not be exceeded or should, for example, because they melt when the temperature is exceeded, catch fire or subject to other physical and / or chemical changes.
  • the present invention seeks to facilitate the work with hot air blowers, in particular to avoid hazards to the user and / or the object to be heated.
  • the invention is based on the consideration that it would be possible in principle to measure the temperature of the surface of an object to be heated by means of a hand-held hot air blower, in particular with a hot air gun, in a working area, in which case the hot air blower and in one hand the other hand the measuring device would have to be held.
  • a hand-held hot air blower in particular with a hot air gun
  • the hot air blower and in one hand the other hand the measuring device would have to be held.
  • the hot air blower would be kept in the preferred, for example, right hand because of its weight and due to a greater accuracy in the target and would therefore be forced to keep the pyrometer measuring device in the other, for example, left hand.
  • a targeting and operating process is usually more difficult, with the exact targeting of the work area is essential to achieve correct measurement results.
  • the invention therefore proposes not to use a conventional pyrometric measuring device for measuring the temperature of a surface in the working range of a hot air blower, but to provide a measuring device, which is specially optimized for use with a hot air blower, namely the Measuring device, in particular the fixing means are formed so that the measuring device so fixed to a hot air blower or fixed, in particular integrated into this, that the measuring device, in particular a measuring axis, fixed in the hot air blower condition, preferably automatically or alternatively in the case of optional Providing a Winkeleinstell coupled after appropriate setting of a tilt angle, to an area in front of the hot air outlet of the hot air blower, in particular to a working range of the hot air blower, is aligned.
  • the invention is based on the idea of designing a pyrometric measuring device such that it is either already firmly integrated in a hot-air blower or, for example, releasably or permanently, in particular by means of fixing means on the hot air blower, preferably on the housing, in each case such that it is ensured that the measuring device is aligned or oriented or aligned in the then fixed to the hot air blower state that the measuring device can detect the surface temperature of an object to be processed by means of the hot air blower in an area in front of the hot air blower.
  • the integration of the measuring device in a hot-air blower or alternatively a corresponding design of fixing means ensures that a measuring axis, along which the thermal radiation can reach measuring means, in particular an IR sensor within the housing of the measuring device, is correctly aligned with an area the hot air outlet of the hot air blower, in particular directly to the work area, ie the main impact area of the effluent from the hot air blower hot air to the object to be heated.
  • the hot air blower in gun form, i. form as a hot air gun.
  • the handle portion of the hot air blower extends over at least 30%, preferably over at least 40%, even more preferably over at least 50% of the axial extent of the axis.
  • the housing is contoured in a pistol grip-free configuration such that the hot air blower can be received in an imaginary circular cylinder whose diameter is smaller than 1.5 times, preferably 1.3 times, more preferably than 1.1 times the diameter of the housing at the axial height of the first third or at the axial height of half the longitudinal extent of the housing along the aforementioned axis.
  • conducting means for guiding the air flow within the housing are arranged at least in sections along the aforementioned axis, preferably such that the heat-protected, in particular spaced from the guide means via a gap or insulation material, the handle portion of the air flow can be flowed through axially is.
  • At least one suction opening for sucking air in the region of the handle portion or axially behind the handle portion is arranged.
  • the hot air blower is made more functional and can also be used in poorly accessible positions or work areas, especially when the housing is combined with a pyrometric measuring device by the pyrometric measuring device is plugged onto the housing or integrated into the hot air blower.
  • the Measuring device to a self-sufficient in relation to the hot air blower, in particular attachable device, which preferably has its own power supply, in particular a separate battery and / or its own accumulator.
  • an interface to the hot air blower can also be provided in order to draw the energy from it.
  • the self-sufficient device preferably includes its own (set) temperature setting option (input means) and / or its own temperature display (display means) for displaying the measured temperature.
  • the autonomous device is preferably equipped with warning and / or display means, in particular LEDs, to be explained later, in order to make it possible to undercut and / or exceed and / or maintain a predetermined and / or predefinable setpoint temperature or a temperature range.
  • the measuring device is a not completely self-sufficient device, which preferably can also be plugged onto a hot-air blower.
  • This non-self-sufficient device preferably has no separate power supply, in particular no own battery and / or no accumulator, but draws its operating current from the hot air blower, preferably via a corresponding interface.
  • the non-self-sufficient device does not have its own temperature-indicating means and / or no (other) display, but instead is connected or connectable to display means of the hot-air blower in a signal-conducting manner.
  • a desired temperature specification also takes place via corresponding adjustment means on the hot air blower.
  • thermoelectric blower can be controlled via the measuring device, in particular such that a predetermined and / or predefinable (setpoint) temperature is maintained or not undershot and / or exceeded.
  • heating device by means of appropriate control means of the measuring device for this purpose, preferably electrically driven, heating device accordingly.
  • a lens preferably perpendicular to a possibly provided lens assigned to the measuring means, and / or measuring axis of the measuring device perpendicular to the measuring means, in particular an IR sensor, has a main outlet flow (envelope area around a main flow axis, preferably with a radius smaller than 2 cm) of the hot air in a working area of the hot air blower meets or cuts.
  • the measuring axis intersects a hot air flow axis (main flow axis) in the work area.
  • the working range is understood as meaning an impact area of the hot air generated by means of the hot air blower on the surface to be heated; the working area is thus spaced from a hot air outlet of the hot air blower, more typically between about 3 and 30 cm, even more preferably between about 4 and 20 cm, even more preferably between 5 and 15 cm.
  • the impingement area of the hot air on the surface to be heated is understood, this impingement area preferably having a diameter in the range between 2 cm and 7 cm, preferably between 3 cm and 6 cm.
  • thermopile sensor which preferably comprises a photodiode, in particular an IR diode, which is optimized or designed for the preferred temperature range.
  • the measuring device is designed for measuring surface temperatures (at least) of over 350 ° C and / over 450 ° C and / over 600 ° C and / or possibly even over 700 ° C.
  • the fixing means for, for example, detachable or alternatively permanent setting of the measuring device (preferably by simultaneous alignment of the measuring device) are formed as a locking means and / or Aufklipsstoff for preferably positive locking setting of the measuring device on the housing of the hot air blower under spring action.
  • the fixing means may be formed such that they can be positively inserted into a corresponding mounting rail of the hot air blower - preferably such that at the end of the translational displacement process, a transfer into a latching position takes place, in which the fixing preferably spring positively locking.
  • the measuring device can be used for its intended purpose, if in addition to the measuring means laser beam means, preferably comprising a laser beam source, for example a laser diode for generating a target laser beam comprises, wherein the laser beam means, which is also a preferably provided optics is aligned, in particular relative to preferably provided fixing means and / or to the measuring means, that the measuring device, in particular by means of the fixing means on the hot air blower is fixed or alternatively so firmly integrated into the hot air gun that the producible with the laser beam means target Laser beam (in particular its central axis or main axis) is directed to an area in front of the hot air outlet, preferably on the aforementioned work area.
  • the target laser beam strikes or cuts the main outlet flow of the hot air in the work area, wherein the work area, as already explained above, is spaced from the hot air outlet of the hot air blower.
  • the target laser beam preferably automatically, is oriented in such a way that it strikes or cuts the measuring axis of the measuring means, in particular in the above-described working range.
  • the above-mentioned meeting or cutting the measuring axis is the ideal case - due to the design tolerances, it is possible that the target laser beam and the measuring axis does not meet exactly - it should therefore be permissible if the target laser beam (in particular its central axis) in particular in the working area, an imaginary envelope region arranged concentrically to the measuring axis strikes or intersects, the envelope region, preferably circular in cross-section, having a maximum radius starting from the measuring axis of preferably less than 2 cm, more preferably less than 1.5 cm, even more preferably less than 1 cm, most preferably less than 0.5 cm.
  • the laser beam whose cross-sectional extension will widen as a rule with increasing distance to a laser steel outlet of the measuring device, can also be used as a focusing aid.
  • the point of impact of the laser beam on the object to be heated deviates from a central axis of the main outlet flow, that is to say as a rule from a longitudinal axis of an outlet tube
  • the actual distance to the object does not correspond to the optimum distance of the desired working range from the object
  • Hot air outlet corresponds and can counteract accordingly by moving the hot air gun toward the surface to be heated or moved away from it.
  • an operator of the hot air gun facing area temperature display means for example a display, even more preferably comprising LED elements to a measured by means of the measuring device surface temperature and / or a, preferably adjustable, to be explained later to be explained target temperature.
  • the measuring device further education an interface comprise, for transmitting a temperature proportional to the measured temperature signal, in particular a digital temperature signal to an electronics of the hot air blower, which then preferably comprises temperature indicating means to display the measured temperature and / or transmitted via the interface, preferably adjustable by the user set temperature in the region of the hot air blower.
  • the measuring device is self-sufficient in terms of its energy supply, that is, preferably in the housing of the measuring device, an energy source is provided or providable, for example, an accumulator or a battery.
  • the measuring device can be designed such, in particular be equipped with an interface that it can be coupled to an energy source of the hot air blower or preferably is automatically coupled when fixing to the hot air blower.
  • the measuring device comprises input means, very particularly preferably in the form of a rocker switch, in order to be able to set a nominal temperature (maximum temperature) beyond which a surface is preferably not heated by means of the hot air blower, it being particularly expedient if these set, in particular selected setpoint temperature on optional Temperaturan Attacheffenn the measuring device and / or the hot air blower can be displayed. It has been found to be particularly advantageous if the measuring device has logic means which compare the surface temperature measured by means of the measuring means of the measuring device with the setpoint temperature and output a comparison signal.
  • the latter feature can be realized, in particular, by the fact that the degree of exceeding is signaled by a different signal intensity, for example brighter or darker, and / or by triggering a different number of signaling elements, for example LEDs of an LED row, whereby even more preferably between and falling below by differently colored signaling elements, insbesondre LEDs can be distinguished, for example, the color red indicate exceeding the target temperature, the degree of exceeding is greater with increasing number of LEDs driven. Similarly, a fall below can be displayed by means of green LEDs, wherein the number of LEDs driven can specify the degree of underrun.
  • the compliance with the target temperature may e.g. be signaled by a green LED.
  • signaling means for signaling the overshoot and / or undershooting of the setpoint temperature
  • such can be provided on the hot air blower, in which case the comparison signal from the comparison means should be transferable to an electronic system of the hot air blower via an interface.
  • the invention also leads to a hot air blower, preferably designed as a hot air gun, comprising a housing and means for generating a hot air stream flowing out of a hot air outlet.
  • the hot air gun preferably comprises a fan and a corresponding heater for heating the air flow.
  • the hot air blower comprises a pyrometric measuring device which is either releasably or permanently fixed to the hot air blower or integral with the hot air blower is formed, in particular by the provision of a common housing.
  • the measuring device is preferably configured, as previously described in detail in various developments.
  • the measuring device is aligned in the state fixed to the hot air blower so that with this a temperature of a surface in a region in front of the hot air outlet, in particular in a workspace with a distance from the hot air blower can be detected.
  • the measuring device can be pivoted relative to the hot air outlet by means of a suitable pivoting device - however, a design is preferred in which this pivot angle is determined by a corresponding design of fixing means or by a corresponding integration in the hot air blower.
  • the measuring device is a permanently or permanently integrated in the hot air blower or alternatively releasably fixable on this measuring device, this is preferably equipped with control means which are designed and intended, the hot air blower, in particular a heater of the hot air blower such to control that a predetermined or preferably manually predefinable setpoint temperature is maintained, in particular not exceeded and / or undershot, wherein the actual temperature for this control is detected by the measuring device.
  • the invention also leads to the use of a pyrometric measuring device in the previously described embodiment for arranging on a hot air blower, in particular for releasably fixing with the aid of fixing means, for detecting a surface temperature of an object to be heated with the hot air blower, wherein the measuring device, preferably directly through the Fixing, ie fixing process on a range, in particular a working range of the hot air blower is aligned in front of the hot air outlet of the hot air blower.
  • Fig. 1 is shown in a schematic view of a designed as a hot air gun hot air blower 1 with attached measuring device 2 for non-contact measuring the temperature of a surface 3 of an object to be heated by means of the hot air gun 1 4.
  • the measuring device 2 is fixed to a housing 7 of the hot air gun 1 with the aid of two spring legs 5 comprising fixing means 6.
  • an integral embodiment of the hot air gun 1 with a Measuring device 2 possible, for example, in the measuring device 2 and hot air gun 1 have a common housing.
  • the hot air gun 1 comprises a handle 8 and an approximately perpendicular thereto extending exhaust pipe 9 with a front side hot air outlet 10. It is conceivable that different nozzles can be plugged onto this hot air outlet 10 in order to change the Ausströmungs characterizing the blown hot air can.
  • the measuring device 2 is oriented in such a way that a measuring axis 11 of the measuring device 1 intersects a main outlet flow 12 whose cross-sectional area ideally corresponds to the hot air outlet cross-sectional area in a working area 13.
  • the idealized state is shown that in the working area 13 (point of impact on the object 4) an imaginary central axis 14 (main flow axis) of the main outlet flow 12 is cut.
  • the working area 13 is about 12 cm from the Hei ⁇ luftauslass 10 away.
  • the pyrometric measuring device 2 is equipped with laser beam means, not shown in detail, for producing a target laser beam 15 whose beam path widened (somewhat) with increasing distance to a laser beam exit 16.
  • the laser beam exit 16 is located below an inlet opening 17 for the heat radiation to be measured.
  • the measuring device 2 is already aligned correctly after being placed on the hot air blower 1 at the prescribed location, so that the temperature in the working area 13 is automatically measured.
  • the measuring device 2 can be assigned to the measuring device and / or the heat gun associated Winkeleinstellstoff, with which the angular position of the measuring device 2 relative to the hot air outlet of the hot air gun is adjustable or adjustable.
  • such adjusting means are not provided, for example, such adjusting means could be provided in a marked by the reference numeral 19 region which is rigid, that is not adjustable in the embodiment shown.
  • Fig. 2 shows a hot air blower 1 in a view from above.
  • a hot air outlet 10 can be seen in the drawing plane on the left.
  • a display 20 is provided, which displays the hot air temperature. If necessary, 20 can be displayed on the temperature of the surface 3 of the object 4, depending on the configuration of the measuring device 2 or a facultative provided interface on this display.
  • the measuring device 2 is equipped with its own temperature-indicating means 21, which are provided on a rear side of the measuring device 2 facing the user.
  • the measuring device 2 has signaling means 22 for signaling, here indicating the overshoot and undershoot of a target temperature indicated by input means 23, which can be additionally displayed as needed on the Temperaturan Adjusteschn and / or on the display 20 (optional) of the hot air gun. 1
  • the signaling means 22 comprise an LED array comprising a plurality of LEDs 24 or other signal elements.
  • the number of LEDs 24 illuminated one way or the other is a measure of the temperature deviation of the object surface from the set target temperature.
  • the LEDs are red in color, for example, and indicate that the setpoint temperature has been exceeded; The more LEDs in the LED row are lit, the greater the deviation.
  • the compliance with a setpoint temperature range is signaled, for example, with a green LED, and in a rear region 27, by controlling a corresponding number of, for example, blue LEDs 24, the extent of the setpoint temperature can be displayed.
  • Fig. 3 shows very schematically a possible wiring diagram for the electronics / electrical system of a measuring device 2 for a hot air gun. 1
  • measuring means 28 with a temperature sensor, such as a thermopile sensor and laser beam means 29. These are electrically connected to an analog-digital converter module 30, which in turn is signal-connected to a microprocessor 31, which in turn signal-conducting connected to an interface 32 (interface) is, with which the measuring device 2 signal-transmitting with an electronics of the hot air blower 1 is connectable, for example, to display readings on the display.
  • the voltage supply can be ensured via such an interface, which is advantageous since both low voltage can be diverted in a simple manner - in this case eliminates the need to provide a self-sufficient energy supply, for example, via batteries in the measuring device. 2
  • Fig. 4 indicates an alternative embodiment. Shown is a measuring device 2 with measuring means 28 and laser beam means 29 which are connected to an A / D converter module 30 which is connected to a microprocessor 31 signal-conducting.
  • the microprocessor 31 is connected to input means 23 for setting a setpoint temperature and to temperature measuring means 21 integrated in the measuring device 2 for displaying the measured object temperature and preferably also the set setpoint temperature.

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  • 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)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Radiation Pyrometers (AREA)
EP11188275.9A 2011-09-23 2011-11-08 Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique Ceased EP2573481A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11188275.9A EP2573481A3 (fr) 2011-09-23 2011-11-08 Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11182625 2011-09-23
EP11188275.9A EP2573481A3 (fr) 2011-09-23 2011-11-08 Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique

Publications (2)

Publication Number Publication Date
EP2573481A2 true EP2573481A2 (fr) 2013-03-27
EP2573481A3 EP2573481A3 (fr) 2013-11-06

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EP11188275.9A Ceased EP2573481A3 (fr) 2011-09-23 2011-11-08 Dispositif de mesure pyrométrique, son utilisation et soufflante d'air chaud dotée d'un dispositif de mesure pyrométrique

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108302764A (zh) * 2018-01-15 2018-07-20 梅瑞 一种新型热风枪
CN113663828A (zh) * 2020-04-30 2021-11-19 上海飞机制造有限公司 一种静电喷枪

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080144696A1 (en) * 2006-12-13 2008-06-19 Diversified Dynamics Corporation Heat gun with infrared surface thermometer
US20080181590A1 (en) * 2007-01-30 2008-07-31 Master Appliance Corp. Heating device and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108302764A (zh) * 2018-01-15 2018-07-20 梅瑞 一种新型热风枪
CN113663828A (zh) * 2020-04-30 2021-11-19 上海飞机制造有限公司 一种静电喷枪

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