EP3523019A1 - Laborgerät, insbesondere magnetrührer - Google Patents
Laborgerät, insbesondere magnetrührerInfo
- Publication number
- EP3523019A1 EP3523019A1 EP17791673.1A EP17791673A EP3523019A1 EP 3523019 A1 EP3523019 A1 EP 3523019A1 EP 17791673 A EP17791673 A EP 17791673A EP 3523019 A1 EP3523019 A1 EP 3523019A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laboratory
- display device
- light
- heating
- state
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
- B01L7/54—Heating or cooling apparatus; Heat insulating devices using spatial temperature gradients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/452—Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0247—For chemical processes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
- H10N10/13—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the heat-exchanging means at the junction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/02—Identification, exchange or storage of information
- B01L2300/025—Displaying results or values with integrated means
- B01L2300/027—Digital display, e.g. LCD, LED
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0627—Sensor or part of a sensor is integrated
- B01L2300/0663—Whole sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/18—Means for temperature control
- B01L2300/1805—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks
- B01L2300/1822—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks using Peltier elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/18—Means for temperature control
- B01L2300/1805—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks
- B01L2300/1827—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks using resistive heater
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/043—Moving fluids with specific forces or mechanical means specific forces magnetic forces
Definitions
- the present invention relates to a laboratory apparatus, in particular a magnetic stirrer, with an outer surface section, in particular a mounting surface for a vessel, in particular a laboratory vessel.
- Magnetic stirrers represent a typical laboratory device and serve to stir respective substances, in particular liquids, in the context of a wide variety of laboratory applications. Since, in particular in the context of laboratory applications, the substances to be stirred on the one hand can be aggressive, for example caustic or corrosive, substances which could damage components of the stirrer or, on the other hand, can act on substances which, in turn, can be sensitive to foreign substances or are to be protected from contamination for some other reason, it is advantageous if there is a possibility to separate the place of stirring, so to speak, from the stirrer, in particular to provide it outside of the stirrer.
- the magnetic drive of the magnetic stirrer is designed to generate a magnetic field changing in such a way that a magnetic stirring element, which can be placed directly in the laboratory vessel with the substance to be stirred, can be driven into a stirring motion in order to supply the substance stir. Since the substance in the laboratory vessel, which is used as material e.g. Glass or plastic covers, can be a direct contact of the substance in the laboratory vessel, which is used as material e.g. Glass or plastic covers, can be a direct contact of the
- Substance can be avoided to the stirrer.
- magnetic stirring element which is in particular designed as a magnetic rod with a protective coating, which is preferably particularly inert and For example, comprises polytetrafluoroethylene, (so-called stir bar) is introduced directly into the substance to be stirred and can then be driven by the magnetic field generated by the magnetic field across the outer wall of the laboratory vessel to a stirring motion.
- the magnetic drive is preferably adjustable, i. at least on and off. Preferably, however, the magnetic drive can also be adjusted beyond. In particular, the magnetic drive can also be adjustable with regard to the speed of the changing magnetic field and thus to the speed of the resulting stirring movement of the magnetic stirring element.
- a respective laboratory device may comprise a heating device.
- the laboratory device in particular a magnetic stirrer, further comprise a, in particular adjustable, heating device, which is designed to heat the outer surface portion, in particular a footprint, in order to heat the, in particular arranged on the footprint, substance.
- the magnetic drive and the heating device of the magnetic stirrer are preferably adjustable separately from one another, wherein the adjustability of the heating device, like the adjustability of the magnetic drive, can basically be limited to the possibility of switching the heating device on and off.
- a substance arranged on the footprint can optionally be stirred, heated or at the same time stirred and heated.
- the heater is variably adjustable beyond the mere switching on and off.
- a heating power of the heater may be adjustable.
- the adjustability of the magnetic drive and / or the heating device can be limited to a respective range of values, wherein the adjustment can each comprise a continuous and / or stepped adjustment.
- the footprint of the magnetic drive is that portion of the magnetic stirrer on which a respective substance is arranged for stirring and / or heating.
- the footprint is preferably oriented horizontally, so that the substance, in particular a substance containing the laboratory vessel, can be easily placed on the footprint.
- the magnetic driving of the respective magnetic stirring element can essentially take place through the mounting surface.
- the heating of the substance can take place in that the installation surface, which is heated by the heating device, transfers heat, in particular via the laboratory vessel, to the substance. When heated, the footprint can be so warm and possibly so hot that touching the footprint can cause pain or burns.
- the installation surface can become warm or hot, for example, by arranging a hot substance on the installation surface.
- the footprint itself can not be considered in the rule, which temperature it currently has.
- a laboratory device such as a magnetic stirrer, which is not or not exclusively used for heating, but often just without heating function only in the context of its basic functionality, ie, for example, used for stirring, therefore, there is a risk of painful burning when about a user not expected that an area of the laboratory equipment could be hot.
- the magnetic stirrer comprises a display device which is designed to display a respective temperature state of the set-up surface.
- a temperature state of the footprint On the basis of the display device can thus be visually recognized, which is present for a temperature state of the footprint.
- at least two temperature states of the footprint are to be distinguished.
- the two states are, in particular, a hot state in which the footprint has a temperature in a region in which contact with the footprint should be avoided, since the contact, for example, may be unpleasant, painful or even harmful to health , And a cooling state in which the footprint has a temperature in a range in which touching the footprint is not critical.
- the respective temperature ranges of the temperature states differentiated by the display device can connect seamlessly to one another and be separated in each case by a predetermined or predefinable temperature threshold value.
- a predetermined or predefinable temperature threshold value In this way, the footprint of the magnetic stirrer for each temperature a respective temperature state are assigned, which can then be identified by the display device.
- a displayed temperature state is in particular correlated with the temperature of the installation surface, but in principle regardless of a heating state of the heater.
- the display device should advantageously be able to warn of the actual danger of burning, in particular even if, for example, the heating device is already switched off and / or the magnetic stirrer is completely disconnected from the power supply, e.g. in the event of a sudden power failure.
- the display device can also detect how long the set-up surface can still be touched when the heating device is already being heated.
- a problem with such a magnetic stirrer with a display device for indicating a respective temperature state of the installation surface can be that the display device is generally dependent on a power supply. If, however, the power supply for the display device is also terminated after a heating of the installation surface, for example when or for switching off the heating device, the display device can not warn of the heated installation surface. In particular, even if the magnetic stirrer is completely switched off as a whole or if a power failure occurs, it may thus happen that the display device does not indicate a hot state of the footprint, although the footprint is still hot.
- the above-mentioned laboratory device may - as explained above - be a magnetic stirrer, but for example also an evaporator, in particular a rotary evaporator, or a shaking and / or mixing device.
- the outer surface section is a section the outer surface of the laboratory device.
- the outer surface portion may be a footprint (especially in the case of a magnetic stirrer and / or a shaker and / or mixer), or a receiving surface of a heating bath for receiving a Schubadbugkeit (especially in the case of a rotary evaporator).
- the object is achieved by a laboratory device having the features of claim 1 and in particular by the fact that the laboratory device is designed to use at least also heat of the outer surface portion, in particular the footprint for the power supply of the display device.
- the display device can be connected to a general power supply of the laboratory device, in particular magnetic stirrer, which also feeds a magnetic drive and / or an optional heating device.
- the display device can be supplied with energy at least in another way, namely by utilizing the heat of the outer surface section.
- This type of power supply may be provided in addition to the said general power supply, so as to jump in case of failure or complete shutdown of the power supply.
- the display device is powered exclusively by the use of the heat of the outer surface portion with energy. Because the display device is intended, in particular, to warn against a hot or heated outer surface section, it may be sufficient to supply the display device with energy only if the outer surface section has sufficient heat for this purpose. In both cases, the use of the heat of the outer surface section can lead to or at least contribute to the Display device decoupled from the general power supply and thus is basically self-sufficient, resulting in improved safety of the laboratory device.
- the display device can be directly brought to display a high temperature corresponding temperature state (hot state) by being energized from the then high heat of the outer surface portion.
- a high temperature corresponding temperature state hot state
- the heat of the outer surface portion may be insufficient for operation of the display device, so that the temperature state (cooling state) corresponding to this lower temperature can be recognized by the inactivity of the display device.
- the display device - fed by the heat of the outer surface section - may light up as long as the outer surface section exceeds a critical temperature, and otherwise - due to insufficient heat for a sufficient energy supply - be extinguished.
- a detection and evaluation of the current temperature of the outer surface portion and an evaluation-dependent driving the display device for outputting a corresponding signal is then not required.
- the use of the heat of the outer surface portion for powering the display device is advantageous not only in that the display device can be independent of the general power supply, but also in that a separate detection of the temperature of the outer surface portion may be dispensable ,
- the laboratory apparatus comprises a heat removal device for the outer surface section and is designed to use a temperature gradient between the outer surface section and the heat removal device for supplying energy to the display device.
- a such soupab technicallyvoriques can be formed as for example for a conventional Magnetetrüh- rer with heating function for heat dissipation from the footprint.
- a laboratory device may have a heating device with a heating plate on which a mounting surface can be formed and which is arranged on a base unit of the laboratory device via a base section. The base portion can then act as a heat dissipation device due to its thermal conductivity, so that along it forms a temperature gradient, which can be used to power the display device.
- the laboratory device may comprise an energy converter which is designed to convert heat of the outer surface section into energy that can be used to supply power to the display device and to supply the energy to the display device.
- This energy, in which the heat is converted is in particular electrical energy.
- another type of energy conversion for example into chemical or radiation energy, by means of which the display device can be brought to display a temperature state is also possible.
- the display can use thermochromic substances whose color depends on their respective temperature.
- such a thermochromic color change based display device may also be provided on a vessel of the laboratory apparatus in which a substance to be stirred can be taken up.
- the named energy converter can in particular pick up the mentioned temperature gradient.
- the energy converter is preferably in thermal Relationship, in particular in thermal contact, to the outer surface portion on the one hand and to said heat removal device on the other.
- the energy converter on the one hand may be in contact with a heating plate of a heating device and on the other hand may be in contact with said base section of the heating device.
- the heat dissipation from the outer surface portion extends at least substantially, in particular substantially completely (apart from, for example, heat radiation into the general environment) via the energy converter, so that the energy converter can also be integrated into the heat dissipation device. In this way, after the heating of the outer surface portion, its residual thermal energy can be optimally utilized by the energy converter.
- the energy converter is designed as a thermoelectric generator, in particular in the manner of a Peltier element.
- a Peltier element which can be obtained as a finished component, allows a simple design implementation of the laboratory device according to the invention.
- a conventional laboratory device can also be retrofitted by arranging such a Peltier element in the region of the outer surface section and a display device, which may be formed, for example, as a simple LED lamp, in a simple manner.
- thermoelectric energy converters especially Peltier elements
- the direction of energy conversion is reversible.
- thermal energy can be converted into electrical or electrical energy into thermal.
- said energy converter is designed not only for converting thermal energy into electrical energy for supplying the display device, but also for converting electrical energy which it receives from, for example, a power supply of the laboratory equipment, into thermal energy, which is then applied to the outer surface can be transmitted.
- the energy converter can therefore also function as a (single or additional) heating element of an optionally provided heating device.
- the energy converter When the heater is turned on, the energy converter thus heats the outer surface portion whose thermal residual energy it can at least partially recuperate after switching off the heater to warn against the hot outer surface portion and the display device can supply.
- the display device can also be supplied with energy from another source, in particular from the general power supply of the laboratory device. This is particularly advantageous when the display device is not only then active, e.g. should be lit when the outer surface section is hot, but should also display information in other cases.
- the display device is designed to also display a respective heating state of a heating device of the laboratory device.
- the laboratory device could in principle comprise a further display device.
- a respective temperature state of the outer surface portion and a respective heating state of the heating device are displayed by the same display device.
- various information can also be combined, in particular superimposed, displayed, for example, by the fact that a flashing starts or ends that a color change takes place or that in addition to a visual display an acoustic feedback occurs. So can the display device be made very compact and there are fewer components required for the laboratory device.
- the display device can in principle spatially and / or temporally separate from one another display respective temperature conditions of thetician vomab- section and respective heating conditions of the optionally provided heating device.
- the display of respective temperature states and respective heating states takes place in combination, that is, in particular spatially and temporally at least overlapping.
- different combinations of a respective temperature state and a respective heating state can be indicated by different optical signals, so that in each case from a single signal both the respective temperature state of the outer surface portion and the respective heating state of the heater can be deduced.
- the respectively present temperature state and the currently present heating state are referred to as the "respective" temperature state or the “respective” heating state.
- Displaying a respective temperature state can be done in basically many different ways.
- different states may be represented by different symbols, one or more of which may each be displayed by the display device.
- the display device may for example comprise a screen-like display panel, such as an LCD or TFT screen.
- a hot state can be represented by a warning symbol, for example. It is also conceivable that different temperature conditions according to their respective temperature range by incremental Symbols, such as a different number of bars or bars of different lengths, are displayed.
- the display device comprises a light element which can be activated to emit light and is designed to display different temperature states of the outer surface section and / or different heating states of a heating device of the laboratory device, the light element for emitting light, each having a different light characteristic head for.
- Several different temperature conditions and optionally also a plurality of different heating states can be displayed by emitting a respective specific light characteristic by the same light-emitting element. Such an embodiment is preferred.
- the lighting element may be, for example, a signal light, such as a small lamp.
- the luminous element can also comprise a luminous surface, which in particular can be backlit by a light source. Such a luminous area may then have a shape that may be selected for good visibility and / or pleasing design.
- a symbol can also be represented by the shape of a luminous surface of the luminous element, for example by the luminous surface being shaped in the manner of a warning triangle and / or flickering flames for warning against a hot outer surface section.
- thermoelectric generators have a low efficiency and the existing on the heated outer surface portion residual heat is limited
- light sources are preferred which allow operation of the display device with comparatively little energy.
- at least one LED is provided as the light source of the light-emitting element due to its low power requirement and the low heat radiation.
- the light-emitting element can in particular also comprise a different type of electroluminescent element as the light source.
- a light-emitting characteristic is a type of emission of light by the light-emitting element that is specific for a respective state.
- Respective luminous characteristics for displaying different temperature states of the outer surface portion may differ in particular with regard to the respective duration, pulse frequency, pulse duration, pulse pause duration, pulse sequence, spatial extent, color, color sequences, color change and / or brightness of the emitted light.
- a temperature state corresponding to a high temperature may be indicated by brighter light than a temperature state corresponding to a lower temperature.
- a temperature state can be indicated by a specific color of the emitted light, wherein, for example, a gradient of green over yellow and orange to red can correspond to ever higher temperatures of the outer surface portion and vice versa.
- the light does not need to be emitted continuously, but can be pulsed differently depending on the state to be displayed.
- it is fundamentally possible to code a multiplicity of different states by means of a different pulse sequence, for example in the manner of Morse codes.
- temporal patterns of low complexity are preferable.
- a simple, in particular at least substantially linear, relationship between the pulse frequency, the pulse duration (duration of a single pulse) and / or the pulse pause duration (duration of the period between two pulses) and a mean temperature of the respective temperature state of the outer surface portion may exist.
- the pulsed or pulsed emission of light is to be understood as a regular increase and decrease in the intensity of the emitted light. In particular, the intensity drops to zero between two pulses.
- the transition between maximum and minimum intensity may be abrupt in the manner of a step function (which may then correspond to blinking) or continuously, for example in the manner of a triangular, sawtooth or sine function.
- the display device is designed to control the lighting element to indicate a switched-state of the aforementioned Schuvor- direction to light according to a first
- Luminous characteristic in particular constant luminous light to emit
- a second light characteristic in particular pulsating light
- a third light characteristic in particular pulsating light
- Luminous characteristic in particular no light to send out.
- the emission of the second luminous characteristic can be fed by the use of the heat of the heated outer surface section.
- the sending of the first light characteristic can be fed for example by a general power supply of the laboratory device.
- a combined display of the respective temperature state of the outer surface portion and the respective heating state of the heater takes place.
- the heating device assumes the switched-on state in which light is emitted according to the first lighting characteristic or the switched-off state. If the heating device assumes the switched-off state, it is possible to further distinguish between at least one hot state and one cold state of the outer surface section based on respective further lighting characteristics. It can be provided that, as long as the switched-state of the heater is present, the heater is thus turned on, the respective temperature state of the outer surface portion is not displayed. Rather, the luminous element can be lit or switched off continuously and independently of the respective temperature states of the outer surface section according to the first luminous characteristic.
- the first luminous characteristic preferably comprises that the luminous element is constant, that is to say, with constant intensity unpulsed in one color, e.g. Red, lights up.
- the luminous element is constant, that is to say, with constant intensity unpulsed in one color, e.g. Red, lights up.
- the light emitting element in this embodiment Unlike a simple function display of the heating device, which lights up during heating and completely extinguished when switching off the heater, the light emitting element in this embodiment, however, still light out even when the heater is turned off and thus their switched-off stand in and / or completely disconnected from the mains, eg due to power failure. This further emission of light takes place as long as the outer surface portion still assumes the hot state, ie a state in which the outer surface portion is still so hot that it should not be touched. However, to make it clear that the outer surface portion has only residual heat, but is no longer actively heated, the light emitting element now emits light with changed light characteristic, namely according to the second light characteristic.
- the second luminous characteristic preferably comprises pulsating light.
- this luminous characteristic is easily distinguishable from the first luminous characteristic of the switched-on heating state. Only when the outer surface portion assumes the cooling state, that is cooled in particular below a predetermined temperature threshold below which a contact of the outer surface portion is unproblematic, the light is emitted according to a third light characteristic. As a result of this luminous characteristic, according to which the luminous element preferably emits no light, the cooling state of the outer surface section and the switched-off state of the heating device are thus simultaneously displayed. The transition between the second and a no-emitting third luminous characteristic can result directly from the fact that the residual heat of the outer surface portion has decreased so much that the remaining heat, then no longer runs out of danger for the further power supply of the display device longer enough.
- further luminous characteristics may be provided for identifying further states.
- more than one hot state of the outer surface portion may be distinguishable by associating each other with a different light characteristic to each hot state.
- a gradual change in the temperature state of the outer surface portion is then preferably indicated by a comparatively gradual change in the emitted luminous characteristic, so that the change can be detected particularly intuitively.
- the display device is designed to trigger the combined display of an off state of the abovementioned heating device and different hot states of the outer surface section to emit the luminous element to emit pulsating light of different pulse frequency.
- the pulse frequency of the emitted light thus depends on the respective hot state of the outer surface portion.
- hot conditions corresponding to hotter temperatures may have a higher pulse rate than hot conditions corresponding to lower temperatures.
- faster pulse frequencies are usually perceived more easily and more quickly, so that the perception of the display device advantageously is the simpler, the higher the temperature of the outer surface portion and thus the risk to a user.
- the temperature of the outer surface section can in principle be made recognizable in any desired finely graduated manner.
- the laboratory device comprises an actuating element, in particular for switching and / or adjusting a heating device of the laboratory device, wherein the display device is provided on the actuating element.
- the display device may comprise the actuating element comprising or integrated into the actuating element.
- Such an actuator can only serve to switch the heater, so be functionally limited to turn the heater on or off. However, the actuator can also serve to adjust the heater beyond, so to set about a heating power of the heater.
- the actuating element which is generally to be operated manually, may be, for example, a toggle switch, pushbutton, rotary knob or the like, whereby such actuating elements can also be realized by touch-sensitive, in particular capacitive or resistive, input elements, such as touch elements can be modeled.
- the input elements can also be designed as removable operating elements. Since the actuating element is designed at least for switching the heating device on and off, preferably also for further adjustment of the heating device, the fact that the display device is provided on the actuating element allows spatially immediate visual and / or acoustic feedback of the respective adjustment respectively.
- the actuating element may be surrounded on several sides by the display device, in particular by a luminous surface or the aforementioned luminous element of the display device, wherein the display device does not necessarily have to surround the actuating element in its entirety.
- the display device can be integrated into the actuating element, for example by the actuating element being at least partially transparent and this area being backlit, so that the area functions as a luminous area of the display device.
- the laboratory device comprises a temperature sensor for detecting a respective temperature of the outer surface portion, wherein the display device is adapted to determine and display the respective temperature state of the outer surface portion in dependence on the respective temperature detected by means of the temperature sensor.
- a temperature sensor for example, a simple platinum measuring resistor can be used.
- the temperature sensor generates a signal representing the respective temperature of the outer surface portion and is received by the display device or a control device of the display device.
- the respective temperature state of the outer surface portion can then be determined by selecting a respective one based on the signal from predefined temperature states. Subsequently, this temperature state can then be displayed, for example by the lighting element being driven to emit a respective luminous characteristic associated with this temperature state.
- the laboratory device comprises a base unit with at least one power supply for an optional magnetic drive, for a heating device and for the display unit, wherein the heating device, in particular a heating plate, formed separately from the base unit and at the
- Base unit is arranged and having the outer surface portion.
- the display device is then provided on the base unit.
- said actuating element may be attached to the base unit and, as explained above, the display device may then be attached to the actuating unit. be provided element.
- the display device directly on the heating device, so that the temperature state of the outer surface section can advantageously be displayed close to or even in the outer surface section itself.
- the arrangement of the display device on or in the base unit has the advantage that it is exposed to the heat generated by the heater to a lesser extent.
- An inventive laboratory device offers compared to conventional laboratory equipment, in particular conventional laboratory equipment with and without heating function, a greater security against accidental burns by a simple, possibly also retrofittable display device.
- This display device which in principle can also be provided in or on a vessel of the laboratory device, allows a user of the laboratory device to quickly and intuitively recognize whether the outer surface portion of a previous heating still has residual heat - even if that Laboratory device is already completely switched off.
- such residual heat display according to the invention using the residual heat as an energy source in particular in a magnetic stirrer, but also in other typical laboratory equipment, especially if they also have an additional heating function in addition to a basic functionality, or in containers without any own heating function, are provided.
- the present invention relates to a magnetic stirrer with a magnetic drive and a mounting surface for a vessel, in particular a laboratory vessel, with a substance to be stirred, wherein the magnetic drive is adapted to generate a so changing magnetic field that thereby a magnetic stirring element in the vessel a stirring motion can be driven to stir the substance, wherein the magnetic stirrer comprises a display device which is adapted to a respective temperature state of the Display surface, wherein the magnetic stirrer is adapted to use at least also heat of the footprint for powering the display device.
- the magnetic stirrer comprises a heating device which is designed to heat the set-up surface in order to heat the substance.
- Fig. 1 shows a possible embodiment of an inventive
- Fig. 2 shows a possible embodiment of an inventive
- Magnetic stirrer in a schematic side view As an example of a laboratory device with a residual heat display according to the invention, a magnetic stirrer 11 is shown in greatly simplified form in FIG.
- the magnetic stirrer 1 1 comprises a base unit 13.
- a heating device 15 is arranged on the upper side of the base unit 13.
- the upwardly facing end portion of this form is designed as a heating plate that can be heated.
- the end face of the cylindrical shape forms an erection and heating surface 17 of the magnetic stirrer 1 1.
- a vessel in particular laboratory vessel, provided with a substance to be stirred and / or to be heated become.
- a magnetic stirring element is introduced into the substance in the manner of a so-called stirring fish, which can be driven through the underside of the vessel to a stirring motion.
- a magnetic drive not visible from the outside is provided for this purpose.
- the latter is designed to generate a magnetic field in a region adjoining the mounting surface above the mounting surface, which magnetic field can then exert magnetic forces on the magnetic stirring element such that the magnetic stirring element rotates at least substantially around the cylinder axis of the cylinder shape of the heating device 15.
- a stirring movement of the magnetic stirring element can be induced in the midst of the substance to be stirred.
- the heating device 15, which may extend at least partially into the interior of the magnetic stirrer 1 1, comprises at least one electrical heating element which is in thermal contact with the mounting surface 17.
- the heating device 15 can heat the footprint 17 so that heat can then be transferred from the footprint 17 to the respective substance placed on the footprint 17 in order to heat the substance.
- at least the said end face of the cylindrical shape of the heating device 15 comprises a material with high thermal conductivity, in particular a metal.
- a gap may be provided between a lower edge of the lateral surface of the cylindrical shape and the upper side of the base unit 13.
- the magnetic drive and the heating device 15 are powered by a common power supply 27, which is integrated in the base unit and has a connection for connecting a power plug (see Fig. 2), in principle, a separate power supply is possible.
- the magnetic drive and the heating device 15 are at least adjustable insofar as they can in principle be switched on and off independently to selectively stir and / or to heat the respective substance.
- the front side of the base unit 13 forms an operating surface 19 of the magnetic stirrer 11, on which a plurality of actuating elements 21 for adjusting the magnetic stirrer 11 are arranged.
- the actuating elements 21 serve in particular to switch the magnetic drive on and off and to set a speed of change of the magnetic field, thereby adjusting the speed of the stirring movement or switching on and off the heating device 15 and setting a heating power of the heating device 15 to the speed to regulate the heating or to achieve a predefined and / or set target temperature in the heating plate and / or the medium.
- a display device 23 of the magnetic stirrer 1 1 which comprises a light-transmitting luminous surface as a luminous element 25, which is backlit by a light source in the form of multi-colored LEDs.
- This luminous area surrounds the at least substantially round push-button 21 annular. Power can be supplied to the display device 23 via the same power supply 27 which is also provided for the magnetic drive and the heating device 15. As long as the magnetic stirrer 1 1 is turned on, the display device 23 is powered by this power supply 27.
- the display device 23 is designed to illuminate continuously when the heating device 15 is switched on and for the duration of the switched-on state of the heating device 15 with constant brightness and color, for example red. Further, a turned-off state of the heater 15 may be displayed by the display device 23 basically by not lighting. In this way, based on the display device 23 at least different be whether the turned on or off heating state of the heater 15 is present.
- the display device 23 is also designed to indicate a respective temperature state of the installation surface in any case when the heating device 15 is switched off. If the heating device 15 has heated the footprint 17 and is then turned off, the footprint 17 may have a residual heat, which only gradually decreases. In order to warn to avoid a naval touch the still hot footprint 17, if necessary, before this residual heat, the display device 23, the lighting element 25 to drive light with a deviating from said constant lighting luminous characteristic at least as long as the footprint 17 an unpleasantly high Temperature has.
- a high residual heat ie a respective temperature of the heated mounting surface 17 in a high temperature range, for example above 100 ° C, in particular by high frequency, for example, about 5 Hz
- flashing lights of the illuminated surface of the display device 23 is signaled.
- a decrease in the temperature with time can also be indicated by the fact that the flashing frequency decreases continuously or gradually.
- the flashing frequency for temperatures between 80 ° C and 100 ° C 4 Hz, for temperatures between 60 ° C and 80 ° C 3 Hz, for temperatures between 50 ° C and 60 ° C 2 Hz, for temperatures between 40 ° C and 50 ° C 1 Hz and for temperatures between 30 ° C and 40 ° C 0.5 Hz.
- other comparable assignments of flash frequencies to temperature ranges may also be present.
- the magnetic stirrer 1 1 in the region of the heating device 15 has a temperature sensor which is arranged directly below the installation surface 17 and is therefore not visible.
- the display device 23 can detect the presence of a respective one of a plurality of predefined temperature states of the installation surface 17 and then display this respective temperature state in accordance with a luminous characteristic assigned to it.
- the color of the light emitted by the multicolored LEDs also changes from red to orange to yellow.
- the lighting element 25 falls below a certain temperature, e.g. about 30 ° C, emits green light for a defined period of time, for example 10 s before it goes out completely. In this way, the at least substantially complete cooling of the footprint 17 can be signaled separately.
- Luminous characteristics can be directly considered the magnetic stirrer 1 1, whether at any time, the heater 15 is just turned on or off and whether in the latter case, the footprint 17 still has a dangerous or unpleasant high residual heat or has already cooled so much that a user she can touch without damage.
- the display device 23 is not only supplied with power via the general power supply 27, but is also electrically embodied with a thermoelectric generator Energy converter 29 connected (see Fig. 2). This is suitable for the residual heat present at the footprint 17 or another part of the heater 15 after heating at least partially into electrical energy with which then the display device 23 can be fed independently of the general power supply 27.
- the two different ways of supplying power to the display device 23 can be seen in the embodiment of a magnetic stirrer 1 1 shown schematically in FIG.
- This embodiment largely corresponds to the embodiment shown in Fig. 1, so that the same reference numerals are used for corresponding elements.
- the actuating element 21 is not designed as a push button or touch element, but as a rotary knob. This may, for example, go beyond mere switching on or off to a control, e.g. the strength of the heating power to be used.
- the display device 23 is formed as a light ring surrounding this knob 21. In principle, however, the display device 23 can also be realized as a separate display unit, for example as an LED.
- the power supply 27 can be seen in the interior of the base unit 13 of the magnetic stirrer 1 1, which is designed as a power supply and can be connected via a cable to a power outlet.
- the electrical connection between the power supply 27 and the display device 23 is shown as a broken line.
- the heating device 15 is inserted into the base unit 13 with a base section 31.
- the residual heat present on the set-up surface 17 after being heated up can be radiated essentially exclusively either to the environment or be removed from the set-up surface 17 by heat conduction via the base section 31. Therefore, forms between the footprint 17 and one of the footprint 17 pioneering area of the Base section 31 from a temperature gradient.
- the base portion 31 can act as a heat dissipation device for the footprint 17.
- the said temperature gradient can be tapped by the energy converter 29, which is merely schematically illustrated, which is arranged on the base section 31 and used to at least partially convert the residual heat into electrical energy.
- the energy converter 29 which is merely schematically illustrated, which is arranged on the base section 31 and used to at least partially convert the residual heat into electrical energy.
- a further energy source available which only depends on whether there is still a sufficient residual heat on the footprint 17 is present, but which is independent of the general power supply 27.
- a broken line electrical connection of the energy converter 29 is connected to the display device 23.
- the display device 23 even with switched off power supply 27 even further, especially by lighting warn of the temperature condition of the footprint 17, as long as it still has such residual heat that they should not be touched in particular.
- the thus achieved independence of the display device 23 from the general power supply 27 thus ensures an improved safety of the magnetic stirrer 1 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016120667.9A DE102016120667A1 (de) | 2016-10-28 | 2016-10-28 | Laborgerät, insbesondere Magnetrührer |
PCT/EP2017/077601 WO2018078096A1 (de) | 2016-10-28 | 2017-10-27 | Laborgerät, insbesondere magnetrührer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3523019A1 true EP3523019A1 (de) | 2019-08-14 |
Family
ID=60191386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17791673.1A Withdrawn EP3523019A1 (de) | 2016-10-28 | 2017-10-27 | Laborgerät, insbesondere magnetrührer |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210331177A1 (de) |
EP (1) | EP3523019A1 (de) |
CN (1) | CN110099739A (de) |
DE (1) | DE102016120667A1 (de) |
WO (1) | WO2018078096A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019112943A1 (de) * | 2019-05-16 | 2020-11-19 | Ika-Werke Gmbh & Co. Kg | Laborgerät, Laborgeräteanordnung sowie Verwendung eines Laborgeräts |
US11504684B2 (en) * | 2019-09-30 | 2022-11-22 | Ohaus Corporation | Hotplate stirrer |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19945498C2 (de) * | 1999-09-10 | 2003-11-20 | Marion Thomssen | Vorrichtung und Verfahren zur Zubereitung von oral zu verabreichenden, flüssigen oder breiförmigen Medien sowie Verwendung der Vorrichtung |
EP1421455A1 (de) * | 2001-06-27 | 2004-05-26 | AB Implementa Hebe | Einrichtung bei der durchführung eines prozesses in einem prozessmedium |
US20050183582A1 (en) * | 2003-08-21 | 2005-08-25 | Mcfadden Curt | Controls for magnetic stirrer and/or hot plate |
US7075040B2 (en) * | 2003-08-21 | 2006-07-11 | Barnstead/Thermolyne Corporation | Stirring hot plate |
CN101297600A (zh) * | 2005-06-24 | 2008-10-29 | 开利公司 | 用于控制热电系统的装置 |
KR200395774Y1 (ko) * | 2005-06-29 | 2005-09-13 | 주식회사 태산솔루젼스 | 마그네틱 교반식 핫플레이트 |
DE102009045293A1 (de) * | 2009-10-02 | 2011-04-07 | BSH Bosch und Siemens Hausgeräte GmbH | Haushaltsgerät, insbesondere Gargerät mit einer sich im Betrieb erwärmenden Komponente sowie Verfahren zum Betreiben eines Haushaltsgeräts mit einer sich im Betrieb erwärmenden Komponente |
EP2362456A1 (de) * | 2010-02-25 | 2011-08-31 | Koninklijke Philips Electronics N.V. | Thermoelektrogeneratorsystem |
PL2409615T3 (pl) * | 2010-07-07 | 2015-11-30 | Fraunhofer Ges Forschung | Pojemnik z wyświetlaczem |
DE102011085524B4 (de) * | 2011-10-31 | 2016-03-17 | Wmf Württembergische Metallwarenfabrik Ag | Gareinrichtung |
DE102013102119A1 (de) * | 2013-03-04 | 2014-09-18 | Miele & Cie. Kg | Kocheinrichtung |
GB201303913D0 (en) * | 2013-03-05 | 2013-04-17 | Touchlight Genetics Ltd | Synthesis apparatus and method |
DE102014118852A1 (de) * | 2014-12-17 | 2016-06-23 | Hans Heidolph Gmbh & Co. Kg | Laborgerät |
CN106040077A (zh) * | 2016-07-21 | 2016-10-26 | 安徽师范大学皖江学院 | 一种智能磁力搅拌器 |
-
2016
- 2016-10-28 DE DE102016120667.9A patent/DE102016120667A1/de not_active Withdrawn
-
2017
- 2017-10-27 US US16/344,136 patent/US20210331177A1/en not_active Abandoned
- 2017-10-27 CN CN201780080628.9A patent/CN110099739A/zh active Pending
- 2017-10-27 EP EP17791673.1A patent/EP3523019A1/de not_active Withdrawn
- 2017-10-27 WO PCT/EP2017/077601 patent/WO2018078096A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
US20210331177A1 (en) | 2021-10-28 |
WO2018078096A1 (de) | 2018-05-03 |
CN110099739A (zh) | 2019-08-06 |
DE102016120667A1 (de) | 2018-05-03 |
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