1
`
`DESCRIPTION
`
`DRYING DEVICE
`
`TECHNICAL FIELD
`
`[0001]
`
`The present invention relates to a drying device that dries a
`
`material
`
`to be dried by electromagnetic induction heating of a
`
`heating coil and also by air coming from an air blower.
`
`BACKGROUND ART
`
`[0002]
`
`There has been known a drying device, such as the one
`
`disclosed in Japanese Patent Laid—Open No.
`
`10—94685.
`
`This
`
`drying device, which treats as a material to be dried a blade part of
`
`an electric razor that has been cleaned with a cleansing liquid,
`
`heats this metallic blade part of the electric razor set in place by
`
`electromagnetic induction heating of a heating coil so as thereby to
`
`dry this blade part. Furthermore, in order to avoid the blade part
`
`from being excessively heated by the heating coil due to a circuit
`
`failure and the like,
`
`the drying device
`
`is provided with a
`
`temperature sensor in a housing that forms a casing of a main unit
`
`of the device, thereby to detect temperature of the blade part placed
`outside
`the housing indirectly therethr-ough
`and stop
`the
`
`electromagnetic induction heating of the heating coil when the
`
`detected temperature reaches a predetermined value or above.
`
`[0003]
`
`According to the drying device disclosed in Japanese Patent
`
`Laid—Open No. 10-94685, the blade part, which is a material to be
`
`dried, is dried only by the electromagnetic induction heating of the
`
`heating coil, and therefore dry time becomes long. Furthermore,
`
`
`
`DESCRIPTION
`
`DRYING DEVICE
`
`TECHNICAL FIELD
`
`[0001]
`
`The present invention relates to a drying device that dries a
`
`material
`
`to be dried by electromagnetic induction heating of a
`
`heating coil and also by air coming from an air blower.
`
`BACKGROUND ART
`
`[0002]
`
`There has been known a drying device, such as the one
`
`disclosed in Japanese Patent Laid—Open No.
`
`10—94685.
`
`This
`
`drying device, which treats as a material to be dried a blade part of
`
`an electric razor that has been cleaned with a cleansing liquid,
`
`heats this metallic blade part of the electric razor set in place by
`
`electromagnetic induction heating of a heating coil so as thereby to
`
`dry this blade part. Furthermore, in order to avoid the blade part
`
`from being excessively heated by the heating coil due to a circuit
`
`failure and the like,
`
`the drying device
`
`is provided with a
`
`temperature sensor in a housing that forms a casing of a main unit
`
`of the device, thereby to detect temperature of the blade part placed
`outside
`the housing indirectly therethr-ough
`and stop
`the
`
`electromagnetic induction heating of the heating coil when the
`
`detected temperature reaches a predetermined value or above.
`
`[0003]
`
`According to the drying device disclosed in Japanese Patent
`
`Laid—Open No. 10-94685, the blade part, which is a material to be
`
`dried, is dried only by the electromagnetic induction heating of the
`
`heating coil, and therefore dry time becomes long. Furthermore,
`
`
`
`2
`
`the temperature sensor has poor responsibility and is prone to
`
`cause measurement errors because it detects the temperature of
`
`the heated blade part indirectly through the housing.
`
`In this case,
`
`it
`
`is not possible to reliably prevent
`
`the blade part from being
`
`excessively heated by electromagnetic induction heating of the
`
`heating coil.
`
`Immediate contact of the temperature sensor with
`
`the blade part can solve the responsibility and measurement error
`
`problems, but in this case the temperature sensor is in danger of
`
`rust because it is in immediate contact with the blade part which
`
`gets wet, and furthermore,
`
`insulation between the temperature
`
`sensor and the blade part cannot be achieved.
`
`[0004]
`
`The dry time of the material to be dried can be reduced by
`
`providing, for example, an air blower for sending air toward the
`
`material to be dried that is heated by electromagnetic induction
`
`heating, but the aforementioned problem of excessive heating of the
`
`material caused when a circuit failure occurs is not yet solved, and
`
`particularly when the air blower breaks down, the temperature of
`
`the material is rapidly increased by the electromagnetic induction
`
`heating, which is dangerous.
`
`[0005]
`
`Disclosed in Japanese Patent Laid—Open No. 2003-308955'is
`
`a heating cooker using an electromagnetic induction method. This
`
`heating cooker has therein a heated member that
`
`is heated by
`
`electromagnetic induction heating of a heating coil, as means for
`
`estimating temperature of a material to be heated, thereby to detect
`
`temperature of
`
`the heated member directly by temperature
`
`detection means and prevent the material to be heated from being
`
`excessively heated by the heating coil based on the detection result.
`
`Therefore, in the case of directly detecting the temperature of the
`
`
`
`3
`
`heated member heated by electromagnetic induction heating in the
`
`same way as the material to be heated, excessive heating of the
`
`material caused by a circuit failure can be detected immediately
`
`and hence prevented. This is, however, a heating cooking device,
`
`which, of course, has neither air blower for sending air to the
`
`material to be heated nor means for reliably preventing excessive
`
`heating of the material caused when a circuit failure occurs.
`
`[0006]
`
`The present invention has been made in consideration of the
`
`foregoing conventional problems, and an object thereof is to provide
`
`a drying device that can dry a material to be dried in a short dry
`
`time by utilizing both electromagnetic induction heating of a
`
`heating coil
`
`and air
`
`from an air
`
`blower,
`
`offer
`
`improved
`
`responsibility and detection accuracy in temperature detection of
`
`the material to be dried with temperature detection means, prevent
`
`rust on the temperature detection means by keeping it from contact
`
`with the material to be heated which gets wet, achieve electrical
`
`insulation of
`
`the temperature detection means, and prevent
`
`excessive heating of the material to be heated that is caused when
`
`the air blower breaks down.
`
`DISCLOSURE OF INVENTION
`
`[0007]
`
`In order to achieve the foregoing object, the drying device
`
`according to the present invention has a heating coil 5a that heats
`
`a material to be dried (blade part 2a in an embodiment) placed on a
`
`dried material-placement part by electromagnetic induction heating,
`
`and an air blower 6 that sends air to the material to be dried. The
`
`drying device is also provided with a heated member 22 that is
`
`heated by electromagnetic induction heating of the heating coil 5a,
`
`
`
`4
`
`and temperature detection means for detecting temperature of the
`
`heated member 22.
`
`The heated member 22 is disposed at a
`
`position where the temperature thereof changes under influence of
`
`the air from the air blower 6. By providing the air blower 6, both
`
`the electromagnetic induction heating of the heating coil 5a and the
`
`air from the air blower 6 can be utilized to dry the material to be
`
`dried, and consequently dry time can be reduced.
`
`Also, by
`
`providing the heated member 22 heated by the electromagnetic
`
`induction heating of the heating coil 5a, the temperature detection
`
`means detects the temperature of the heated member 22, that is a
`
`substitute of the material to be dried, so as thereby to estimate the
`
`temperature of the material, thereby preventing the material from
`
`being excessively heated by the heating coil 5a based on the
`
`estimated temperature. Furthermore, the heated member 22 can
`
`be disposed away from the material to be dried, so that the heated
`
`member 22 and the temperature detection means for detecting the
`
`temperature thereof are not in contact with the wet material to be
`
`dried, and that they can be isolated from this material.
`
`In this
`
`case, the temperature detection means can be in immediate contact
`
`with the heated member 22 for
`
`the purpose of
`
`improving
`
`responsibility and measurement accuracy of
`
`the temperature
`
`detection. Furthermore, the heated member 22 is disposed at a
`
`position where the temperature thereof changes under the influence
`
`of the air from the air blower 6, and therefore, when the air blower
`
`6 breaks down and accordingly the blade part 2a receiving no air is
`
`heated to high temperatures by the heating coil 5a, the temperature
`
`of the heated member 22 can be increased with a temperature rise
`
`of the material to be dried. This makes it possible to detect also
`
`the temperature rise of the material due to the breakdown of the air
`
`blower 6, and based on this detection, excessive heating of the
`
`
`
`
`
`material caused by the breakdown of the air blower 6 can be
`
`5
`
`prevented.
`
`[0008]
`
`Moreover, according to the drying device of the present
`
`invention, the heated member 22 is provided between the heating
`
`coil 5a and the dried material— placement part. This means that
`
`the heated member 22 can be disposed between the heating coil 5a
`
`and the material
`
`to be dried through which a magnetic flux
`
`produced by the heating coil 5a passes,
`
`thereby preventing
`
`variations in the temperature rise of the heated member 22 that are
`
`caused by displacements thereof relative to the heating coil 5a.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0009]
`
`FIG.
`
`1
`
`is an example of an embodiment of the present
`
`invention, and is an explanatory View showing a state where an
`
`electric razor is set in a drying device.
`
`FIG. 2 is an explanatory View of the drying device in the
`
`example.
`
`FIG. 3 is a circuit diagram of an electromagnetic induction
`
`heating circuit block in the example.
`
`FIG.
`
`4
`
`shows graphs
`
`for
`
`temperature
`
`changes of a
`
`temperature fuse and a blade part in the case that the blade part is
`
`dried using the drying device in the example,
`
`in which (a)
`
`is for
`
`when an air blower is operating normally and (b) is for when the air
`
`blower is stopped.
`
`BEST MODE FOR CARRYING OUT THE INVENTION
`
`{0010]
`
`Referring to the accompanying drawings, there is shown an
`
`
`
`6
`
`embodiment of the present invention. A drying device 1, which is
`
`an example of the embodiment shown in FIGS.
`
`1
`
`to 4, dries a
`
`metallic blade part 2a provided on a head portion of a conventional
`
`hand-held electric razor 2, by utilizing electromagnetic induction
`
`heating of a heating coil 5a and air from an air blower 6.
`
`A
`
`material to be dried by the drying device 1 is the blade part 2a of
`
`the electric razor 2.
`
`[00 1 1]
`
`In addition to means for drying the blade part 2a of the
`
`electric razor 2, the drying device 1 further has means for cleaning
`
`the blade part 2a with a cleansing liquid, and can therefore be used
`
`as a washer. For example, a series of a process of cleaning the
`
`blade part 2a of the electric razor 2 with the cleansing liquid and a
`
`subsequent process of drying the cleaned blade part 2a can be done
`
`only by this dying device 1.
`
`[0012]
`
`As shown in FIG. 2, a storage recessed portion 4, which
`
`opens upward, is formed on an upper face part of a housing 3 that
`
`forms a casing of the drying device 1.
`
`In the storage recessed
`
`portion 4, the electric razor 2 can be received in such a manner
`
`that the blade part 2a thereof faces downward, as shown in FIG. 1.
`In this state, the blade part 2a of the electric (razor 2 is placed in a
`
`
`
`lower part of the storage recessed portion 4. Note that the electric
`
`razor 2 received in the storage recessed portion 4 is fixed to the
`
`housing 3 at a predetermined position, which is not shown.
`
`[0013]
`
`The storage recessed portion 4 is used as a washing tank
`
`that stores the cleansing liquid when the blade part 28. is cleaned.
`
`The blade part 2a of the electric razor 2 placed in the storage
`
`recessed portion 4 as described above is soaked in the cleansing
`
`
`
`7
`
`liquid stored in the storage recessed portion 4, and then the electric
`
`razor 2 is caused to drive the blade part 2a, so that the blade part
`
`2a of the electric razor 2 can be cleaned. Note that the drying
`
`device 1 has cleaning—liquid supply/discharge means, which is not
`
`shown, such as a pump used to supply the cleansing liquid into the
`
`storage recessed portion 4 and discharge the cleansing liquid
`
`therefrom.
`
`[0014]
`
`Also at dry time, the storage recessed portion 4 is used to
`
`receive the electric razor 2. That is, the lower part of the storage
`
`recessed portion 4 is a dried material—placement part Where the
`
`blade part 2a that is the material
`
`to be dried is placed.
`
`The
`
`following explanation will be given of the means for drying the blade
`
`part 2a of the electric razor 2.
`
`[0015]
`
`The drying device 1 has an electromagnetic induction heater
`
`5 and an air blower 6 as the means for drying the blade part 2a of
`
`the electric razor 2. The air blower 6 is disposed at an upper part
`
`of a side face of
`
`the storage recessed portion 4, and during
`
`
`
`operation thereof,
`
`it sends air from this position toward another
`
`opposite side face of the storage recessed portion 4. The air blower
`
`6 provides an air flow obliquely downward, and when it is operated
`
`in a condition where the electric razor 2 is placed in the storage
`
`recessed portion 4 as shown in FIG. 1, the air from the air blower
`
`hits the blade part 2a of the electric razor 2 or a neighborhood
`
`thereof.
`
`[0016]
`
`Meanwhile,
`
`the
`
`electromagnetic
`
`induction heater
`
`5
`
`is
`
`composed of the heating coil 5a and a core member 5b, and is
`
`disposed within the housing 3 so as to face an inner face of a
`
`
`
`bottom face part 4a of the storage recessed portion 4.
`
`8
`
`[0017]
`
`The electromagnetic induction heater 5 is provided to an
`
`electromagnetic induction heating circuit block 7 installed within
`
`the housing 3. By sending a high—frequency current about 100
`
`kHz to the heating coil 5a from the electromagnetic induction
`
`heating circuit block 7, an eddy current is induced in the blade
`
`part 2a of the electric razor 2 because the blade part 2a stays on a
`
`magnetic path of a magnetic flux produced by the heating coil 5a,
`
`and as a result, electromagnetic induction heating can be made.
`
`[0018]
`
`FIG. 3 is a circuit diagram of the electromagnetic induction
`
`heating circuit block 7. As shown in the drawing, a power source
`
`10 is connected in series, each with a resonance circuit composed
`
`of the heating coil 5a and a capacitor 11, a switching element 9
`
`composed of FETs, and a resistor 12. The power source 10 is also
`
`connected in series, each with a resistor 13 and a capacitor 14 so
`
`that the capacitor 14 is charged by electric power from the power
`
`source 10 through the resistor 13. A connecting point 15 between
`
`the resistor 13 and the capacitor 14 is connected to a gate of the
`
`switching element 9 Via a feedback winding 16 and a resistor 17.
`
`A connecting point 18 between the switching element 9 and the
`
`resistor 12 is connected to a base of a transistor 19 via a resistor
`
`21. An emitter and a collector of the transistor 19 are connected
`
`to the power source 10 and a connecting point 20 between the
`
`resistor 17 and the switching element 9, respectively. Therefore,
`
`when electric power is supplied from the power source 10,
`
`this
`
`circuit is oscillated, and thus electromagnetic induction heating of
`
`the heating coil 5a is performed. When the electric power supply
`
`is stopped, the electromagnetic induction heating of the heating coil
`
`
`
`
`
`
`
`5a is terminated.
`
`[0019]
`
`In order to dry the blade part 2a of the electric razor 2 using
`
`the drying device 1, the electric razor 2 is housed in the storage
`
`recessed portion 4
`
`in which the cleansing liquid has been
`
`discharged, then a high-frequency current is sent to the heating
`coil 5a, and the air blower 6 is started at the same time. The blade
`
`part 2a of
`
`the electric razor 2 that
`
`is placed on the dried
`
`material-placement part in the lower part of the storage recessed
`
`portion 4 is then heated to high temperatures by electromagnetic
`
`induction heating of the heating coil 5a, and at the same time the
`
`air from the air blower 6 hits the blade part 2a. Also at this time,
`
`moist air in the storage recessed portion 4 is blown off by the air
`
`from the air blower 6 and dry air always flows into the storage
`
`recessed portion 4, thereby promoting drying of the blade part 2a of
`
`the electric razor 2.
`
`[0020]
`
`In order to prevent excessive heating of the blade part 2a of
`
`the electric razor 2 by the heating coil 5a that is caused when the
`
`circuit or the air blower 6 breaks down at the dry time utilizing the
`
`electromagnetic induction heating and the air, the drying device 1
`
`is provided with excessive heating prevention means, which will be
`
`described below.
`
`[0021]
`
`In the housing 3, a metallic heated member 22 is provided
`
`as means for estimating temperature of the blade part 2a, which is
`
`a material to be dried. The heated member 22 is disposed between
`
`the heating coil 5a of the electromagnetic induction heater 5 and
`
`the bottom face part 4a of the storage recessed portion 4, and at
`
`the dry time of the blade part 2a of the electric razor 2,
`
`the
`
`
`
`10
`
`magnetic flux produced by the heating coil 5a passes through the
`
`heated member 22. This heated member 22 is disposed in contact
`
`with the inner face of the bottom face part 4a of the storage
`
`recessed portion 4 where the air from the air blower 6 hits, or
`
`disposed in the neighborhood of
`
`the bottom face part 4a.
`
`Therefore,
`
`the temperature of
`
`the heated member 22 changes
`
`depending on temperature of the bottom face part 4a of the storage
`
`recessed portion 4. Accordingly, when both the electromagnetic
`
`induction heater 5 and the air blower 6 are activated for drying but
`
`the air from the air blower 6 does not hit the bottom face part 4a of
`
`the storage recessed portion 4 for some reasons, this affects the
`
`heated member 22, which means that
`
`the temperature thereof
`
`increases higher compared to the case that the air blower 6 is
`
`operating normally.
`
`[0022]
`
`Between the heated member 22 disposed on the inner face of
`
`the bottom face part 4a and the heating coil 5a of
`
`the
`
`electromagnetic induction heater 5, a temperature fuse 23 is
`
`provided as temperature detection means, which is in immediate
`
`contact with the heated member 22 and is thermally connected
`
`thereto.
`
`Furthermore, when the temperature fuse 23 is heated
`
`above a predetermined temperature as the heated member 22 is
`
`heated, a controller 24 is designed to terminate the electromagnetic
`
`induction heating of the blade part 2a with the heating coil 5a
`
`based on information fed from the temperature fuse 23.
`
`[0023]
`
`Therefore, when a high—frequency current is send to the
`
`heating coil 5a to dry the blade part 2a of the electric razor 2, the
`
`heated member 22 is heated, as in the same manner as the blade
`
`part 2a, by electromagnetic induction heating of the heating coil 5a
`
`
`
`11
`
`and the temperature of the heated member 22 rises. When the
`
`electromagnetic induction heating of
`
`the heating coil 5a is
`
`terminated,
`
`the temperature of
`
`the heated member 22 falls.
`
`Therefore, when the blade part 2a is heated to high temperatures
`
`by the heating coil 5a because a circuit failure or the like occurs at
`
`the dry time, the heated member 22 is heated to high temperatures
`
`by the electromagnetic induction heating of the heating coil 5a, and
`
`accordingly the
`
`temperature
`
`fuse
`
`23
`
`is heated above
`
`the
`
`predetermined temperature.
`
`In response thereto, the controller 24
`
`terminates the electromagnetic induction heating of the heating coil
`
`5a thereby to prevent
`
`the blade part 2a from being excessively
`
`heated.
`
`[0024]
`
`The heated member 22 is only required to be disposed where
`
`the magnetic flux of the heating coil 5a passes, so that the heated
`
`member 22 and the temperature fuse 23 for estimating the
`
`temperature of the blade part 2a can be placed away from the blade
`
`part 2a. Therefore, by disposing the heated member 22 and the
`
`temperature fuse 23 inside the housing 3 as described earlier, the
`
`cleansing liquid does not
`
`splash over
`
`them,
`
`and electrical
`
`insulation between them and the blade part 2a can be achieved by
`
`the housing 3.
`
`In this case,
`
`the temperature fuse 23 can be
`
`disposed in immediate contact with the heated member 22 that is
`
`heated directly by electromagnetic induction heating of the heating
`
`coil 5a, which makes it possible to promptly detect excessive
`
`heating of the blade part 2a of the electric razor 2, thereby reliably
`
`preventing the blade part 2a from being excessively heated by
`
`electromagnetic induction heating.
`
`[0025]
`
`FIG. 4(a)
`
`is a graph showing temperature changes of the
`
`
`
`12
`
`temperature fuse 23 and the blade part 2a during drying of the
`
`blade part 2a using the drying device 1
`
`in a state where the air
`
`blower 6 is operating normally, and FIG. 4(b) is a graph showing
`
`temperature changes of the temperature fuse 23 and the blade part
`
`2a during drying of the blade part 2a using the drying device 1 in a
`
`state where the air blower 6 is being stopped.
`
`In FIGS. 4(a) and
`
`4(b), lines A and B denote temperature changes of the temperature
`
`fuse 23 and the blade part 2a, respectively.
`
`[0026]
`
`As apparent from these graphs, when no air hits the blade
`
`part 2a because the air blower 6 stops, and consequently the blade
`
`part 2a is heated to high temperatures by the heating coil 5a, the
`
`temperature of the heated member 22 rises. This is because the
`
`heated member 22 is disposed just below the bottom face part 4a of
`
`the storage recessed portion 4 where the air from the air blower 6
`
`hits.
`
`Thus, by providing the heated member 22 at a position
`
`where the temperature thereof changes under the influence of the
`
`air from the air blower 6, the temperature of the heated member 22
`
`can be increased as the blade part 2a is heated to high temperature
`
`by the heating coil 5a because the air blower 6 breaks down and
`
`then no air hits the blade part 2a.
`
`Also in this case,
`
`the
`
`temperature
`
`fuse
`
`23
`
`is
`
`heated
`
`above
`
`the
`
`predetermined
`
`temperature, and accordingly the controller 24 terminates the
`
`electromagnetic induction heating of the heating coil 5a. Therefore,
`
`according to the present invention, also when the air blower 6
`
`breaks down,
`
`it is possible to prevent the blade part 2a of the
`
`electric razor 2 from being heated excessively.
`
`[0027]
`
`When the air from the air blower 6 hits the bottom face part
`
`4a of the storage recessed portion 4, the temperature of the heated
`
`
`
`
`
`13
`
`member 22 falls. This heated member 22 is provided to the inside
`
`of the housing 3 that the air from the air blower 6 does not hit
`
`directly, and therefore a temperature falling rate of the heated
`
`member 22 which is observed when the air is stopped is smaller
`
`than that of the blade part 2a of the electric razor 2 that directly
`
`receives
`
`the air.
`
`This enables
`
`the use of,
`
`for example, a
`
`temperature fuse 23 whose operating temperature is high, and thus
`
`eliminates the need of using a special
`
`temperature fuse whose
`
`operating temperature is below 80°C.
`
`Furthermore, operational
`
`errors of the temperature fuse 23 can be prevented reliably.
`
`[0028]
`
`In this embodiment,
`
`the heated member 22 is disposed
`
`between the heating coil 5a and the dried material—placement part,
`
`so that the heated member 22 can be placed between the heating
`
`coil 5a and the material to be dried through which the magnetic
`
`flux produced by the heating coil 5a passes,
`
`thereby preventing
`
`variations in the temperature rise of the heated member 22 that are
`
`caused by displacements thereof relative to the heating coil 5a.
`
`[0029]
`
`Note that the embodiment has been handled the case that
`
`the temperature detection means is the temperature fuse 23, but
`
`the temperature detection means can be a temperature sensor or
`
`other temperature detection devices.
`
`Furthermore,
`
`the present
`
`invention is applicable not only to the drying device 1 for drying the
`
`blade part 2a of the electric razor 2, but also to other drying devices
`
`which have already been known.
`
`INDUSTRIAL APPLICABILITY
`
`[0030]
`
`According to the drying device of the present invention, both
`
`
`
`14
`
`electromagnetic induction heating of a heating coil and air from an
`
`air blower can be utilized to dry a material to be dried, and also dry
`
`time can be reduced. Furthermore, in temperature detection of the
`
`material
`
`to
`
`be
`
`dried with
`
`temperature
`
`detection means,
`
`responsibility and detection accuracy thereof can be improved.
`
`Moreover,
`
`the temperature detection means can be kept
`
`from
`
`contact with the wet material to be dried thereby to prevent rust
`
`and achieve electrical
`
`insulation of
`
`the temperature detection
`
`means. Furthermore,
`
`it is possible to reliably prevent excessive
`
`heating of the material
`
`to be dried which occurs when the air
`
`blower breaks down.
`
`[0031]
`
`In addition, according to the present invention, it is possible
`
`to stabilize the temperature rise of a heated member heated by the
`
`heating coil, which enables accurate estimation of the temperature
`
`of the material to be dried.
`
`
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