JP2014150942A - Hair dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-type hair dryer resolving difficulty in use by shortening a longitudinal distance from an intake part to a discharge part.SOLUTION: A fan 22 and a rotary part of a motor 21 are integrated, an electromagnet 25 of the motor 21 is provided inside a hair dryer, the fan 22 is rotated by energizing a coil constituting the electromagnet 25, and air is taken from an intake part 12 to the inside and is blown to a heater 17, so that the heated air is sent from a discharge part 14 to the outside of the hair dryer. The fan 22 and the motor 21 are integrated, so that a shaft part of the fan 22 is served as the motor 21 and the length of the motor 21 along the longitudinal direction N and the length of the fan 22 are not separate so as to shorten the distance in the longitudinal direction N from the intake part 12 to the discharge part 14. Therefore, the center of gravity of the hair dryer is placed from a part of a draft air passage 28 onto a handle 2 as a grip part, so as to resolve difficulty in use.

Description

  The present invention relates to a hair dryer used for hair styling and the like.

  As shown in FIG. 10, the conventional hair dryer has an intake portion 101, a blower portion 102, a heating portion 103, and a discharge portion 104 arranged in series with a main body 105 and has a shape that is long in the longitudinal direction N. . The blower unit 102 includes a motor 111 and a fan 112 rotated by the motor 111, and a design required distance D is ensured along the longitudinal direction N in order to dispose the motor 111 and the fan 112 in the main body 105. ing. A similar structure is also disclosed in Patent Document 1, for example.

    Conventionally, a triac (bidirectional three-terminal thyristor: not shown) that cuts off the power supply is provided in the heating unit 103 that is a heater. However, since the triac generates heat, the heating unit 103 has not yet been heated. Arranged in the air duct. For this reason, the triac which is a semiconductor switch element has been arrange | positioned in the position before the heating part 103 in the blower outlet side of the fan 112. FIG.

JP 2012-55640 A

    As described above, conventionally, it has a long shape in the longitudinal direction N, and since hot air is applied to itself along the longitudinal direction N, add the length of the hair dryer and separate from it. The longer the shape was, the heavier and more difficult it was to use.

    In FIG. 10, the intake area S1 of the intake section 101, the cross-sectional area S2 of the motor 111, and the discharge area S3 of the discharge section 104, which are orthogonal to the longitudinal direction N, are shown, but the cross-sectional area S2 of the motor 111 is shown. Is a waste air intake area that overlaps with the air intake area S 1, and the length along the longitudinal direction N of the motor 111 is a wasteful space with respect to the air blowing unit 102.

  Furthermore, in the conventional configuration, the triac is drawn out from the substrate to the outlet of the fan 112 in front of the heating unit 103, or a cool air path is formed separately from the hot air path, and the triac is disposed there. It was. For this reason, there is an inconvenience that wiring from the substrate to the triac is necessary, and each air path of hot air and cold air is necessary.

  Accordingly, a first object of the present invention is to provide a thin hair dryer that can shorten the distance in the longitudinal direction from the intake section to the discharge section and eliminates the difficulty of use.

  A second object of the present invention is to provide a hair dryer capable of easily mounting a semiconductor switch element.

  In the first aspect of the present invention, since the fan and the motor as the air blowing unit are integrated, the shaft of the fan serves as the motor, and the motor length and the fan length along the longitudinal direction are not separated. It is possible to shorten the distance in the longitudinal direction from the intake portion serving as a path to the discharge portion. Therefore, the center of gravity of the hair dryer can be placed from the air passage portion to the handle portion, and a thin hair dryer that eliminates the difficulty of use can be provided.

  According to the second aspect of the present invention, it is possible to provide a hair dryer that does not cause rotation inhibition that is entangled with the fan itself even when hair or the like enters by providing an air intake portion inside the hair dryer.

  In the invention of claim 3, the semiconductor switch element is arranged not on the blower outlet side of the blower unit in front of the heating unit but on the wind inlet side of the blower unit, so that each air path of the hot air and the cold wind is purposely provided. The semiconductor switch element can be easily attached at a position away from the heating unit.

  According to the fourth aspect of the present invention, the semiconductor switch element can be mounted more easily by being directly mounted on the substrate without being routed by wiring from the substrate.

  In the invention of claim 5, even if a metal pin or the like is inserted from the air intake portion of the hair dryer, the hair dryer can be provided with improved safety without being blocked by the insulator and contacting the semiconductor switch element.

  According to the sixth aspect of the present invention, a small hole that does not allow a thin pin such as a wire to pass through the insulator is formed to ensure air permeability, thereby suppressing a reduction in the cooling effect of the semiconductor switch element by the insulator and the semiconductor switch element. A hair dryer with improved safety that prevents pins from coming into contact with heat radiating fins can be provided.

  According to the first aspect of the present invention, it is possible to shorten the distance in the longitudinal direction from the intake portion to the discharge portion, and it is possible to provide a thin hair dryer that eliminates the difficulty of use.

  According to the invention of claim 2, it is possible to provide a hair dryer that does not inhibit rotation in which hair or the like is entangled with the fan.

  According to invention of Claim 3, the hair dryer which can attach a semiconductor switch element easily in the position away from the heating part can be provided.

  According to invention of Claim 4, the hair dryer which can attach a semiconductor switch element more easily can be provided.

According to the invention of claim 5, it is possible to provide a hair dryer that prevents contact with the semiconductor switch element and enhances safety.
Can be provided.

  According to the sixth aspect of the present invention, it is possible to provide a hair dryer with improved safety by preventing contact with the semiconductor switch element while suppressing reduction in the cooling effect of the semiconductor switch element due to the insulator.

It is a longitudinal cross-sectional view of the thin hair dryer in 1st Embodiment of this invention. It is a rear view same as the above. It is an enlarged vertical sectional view of the principal part. It is a longitudinal cross-sectional view of the hair dryer in 2nd Embodiment of this invention. It is a rear view of the state which removed the intake part same as the above. It is a circuit diagram of the power supply part in 3rd Embodiment of this invention. FIG. 6 is a waveform diagram showing the relationship between the power supply voltage and the peak current flowing through the resistor. It is a circuit diagram of the electromagnetic induction heating apparatus in 4th Example of this invention. It is a graph which shows the relationship between the electric current of a breaker and a current fuse, and operation time same as the above. It is a longitudinal cross-sectional view of the hair dryer in a prior art example.

  Hereinafter, preferred embodiments of the hair dryer of the present invention will be described with reference to the accompanying drawings. In the following embodiments, common parts and portions are denoted by common reference numerals, and description of common portions is omitted as much as possible to avoid duplication.

  1 to 3 show a thin hair dryer according to the first embodiment of the present invention. In each of these drawings, 1 is a main body that forms the outline of a hair dryer, and this main body 1 is composed of a handle 2 that is a handle portion and a housing 3 that is connected to the upper end of the handle 2. It is formed of a synthetic resin molding. A rotation shaft 4 is provided at a connecting portion between the handle 2 and the housing 3, and the handle 2 is rotated in the direction of arrow S with respect to the housing 3 around the rotation shaft 4. The handle 2 is provided with one or more switches 5 as an operating body so that it can be manually operated.

  The housing 3 is formed in a ring shape when viewed from the front surface (front surface) or the back surface (rear surface) of the main body 1, and a hollow portion 6 is formed at the center thereof. The hollow portion 6 extends in the longitudinal direction N of the hair dryer perpendicular to the upright direction of the handle 2, and both the front surface and the rear surface are open.

  The housing 3 is located near the back surface of the main body 1, and the intake portion 12 is formed in the inner wall 11 that forms the outer peripheral surface of the hollow portion 6, while the discharge portion 14 is formed in the front wall 13 that forms the front surface of the main body 1. doing. Further, inside the housing 3, a blower unit 16 is disposed on the back side, and a heater 17 as a heating unit is disposed on the front side. The air blower 16 includes a motor 21 that converts an electrical signal into a rotational force and a fan 22 that is rotated by the motor 21. The fan 22 is integrated with the rotating part of the motor 21, not separately. As a result, the required design distance D along the longitudinal direction N for arranging the motor 21 and the fan 22 can be made shorter than that of a conventional hair dryer.

  The structure of the blower unit 16 will be described in more detail. The rotating ring-shaped fan 22 holds a ring-shaped permanent magnet 24 that becomes a rotor of the motor 21 in a part of the shape, and faces the permanent magnet 24. A ring-shaped electromagnet 25 serving as a stator of the motor 21 is provided on the outer wall of the casing 3. Although not shown, the electromagnet 25 is formed by winding a conductive coil around a magnetic core. In addition, the air intake unit 12 is disposed facing the suction port 26 of the air blowing unit 16 facing the inner peripheral surface of the fan 22, and the heater 17 is connected to the air outlet 27 of the air blowing unit 16 facing the front surface of the fan 22. It is arranged facing. Therefore, when the fan 22 is rotated by energizing the air blowing unit 16, a ring-shaped air passage 28 is formed inside the housing 3 from the air intake unit 12 through the air blowing unit 16 and the heater 17 to the discharge unit 14. The

  Next, the operation of the above-described configuration will be described. When the switch 5 provided in the handle 2 is operated in order to blow air, the permanent magnet 24 and the electromagnet 25 are energized by energization of the coil constituting the electromagnet 25 of the blower portion 16. During this time, a suction force and a repulsive force are repeatedly generated, and the fan 22 rotates continuously. As a result, air is sucked from the air intake portion 12 into the air blowing portion 16 in the housing 3, and air is sent from the discharge portion 14 to the hair facing the front surface of the housing 3 through the heater 17. Further, when the heater 17 is energized by operating another switch 5, the air blown from the blowout port 27 of the blower unit 16 is heated when passing through the heater 17 and is not cooled by the discharge unit 14. Hot air can be sent out. In FIG. 1 and FIG. 3, a series of such cold air and hot air flows are indicated by arrows F.

  In particular, in this embodiment, the rotating portion of the motor 21 and the fan 22 are integrated, and the components of the electromagnet 25 are arranged on the outer peripheral side of the casing 3, so that the distance in the longitudinal direction N from the intake portion 12 to the discharge portion 14. The thin hair dryer which shortened the ventilation path 28 and enabled the shortening of the ventilation path 28 is provided. Further, unlike a conventional hair dryer, a hollow portion 6 is provided on the inner peripheral side of the housing 3, and an air intake portion 12 is provided on the inner wall 11 of the housing 3 located inside the hair dryer, so that hair or the like can be used for hair. Even when it enters the dryer, it is structurally difficult to reach the intake port 12, and it is possible to prevent the rotation from being entangled with the fan 22 itself inside the casing 3.

  As described above, in the present embodiment, the fan 22 and the rotating portion of the motor 21 are integrated, the electromagnet 25 of the motor 21 is provided inside the hair dryer, and the fan 22 is rotated by energizing the coils constituting the electromagnet 25. The air is taken into the inside from the intake section 12 and blown to the heater 17 as the heating section, so that the warmed air is sent out from the discharge section 14 to the outside of the hair dryer.

  In this case, since the fan 22 serving as the air blowing unit 16 and the motor 21 are integrated, the shaft of the fan 22 becomes the motor 21, and the length of the motor 21 and the length of the fan 22 along the longitudinal direction N are The distance in the longitudinal direction N from the intake portion 12 to the discharge portion 14 that becomes the air passage 28 can be shortened without being separated. Therefore, the position of the center of gravity of the hair dryer can be placed on the handle 2 that is the handle portion from the portion of the air passage 28, and a thin hair dryer that eliminates the difficulty of use can be provided.

  Moreover, in this embodiment, the intake part 12 for taking in air is provided in the inner wall 11 of the housing 3 located inside a hair dryer.

  In this case, by providing the air intake portion 12 inside the hair dryer, it is possible to provide a hair dryer that does not cause rotation inhibition that is entangled with the fan 22 itself even when hair enters.

  4 and 5 show a thin hair dryer according to the second embodiment of the present invention. In each of these drawings, in the present embodiment, the casing 3 is not formed in a ring shape having a hollow portion 6 but is formed in a cylindrical shape having no hollow portion 6, and an air intake portion 12 having a large number of holes on the rear surface which is one end thereof. On the other hand, the discharge part 14 opened to the front surface which is the other end is disposed. In the casing 3, a blower 16 is disposed on the back side, and a heater 17 as a heating unit is disposed on the front side. The blower unit 16 includes a motor 21 that converts an electrical signal into a rotational force, and a fan 22 that is rotated by the motor 21, and along the longitudinal direction D of the hair dryer, the air intake unit 12, the fan 22, the motor 21, The heater 17 and the discharge part 14 are each arrange | positioned in order on the substantially straight line.

  The internal structure of the casing 3 will be described in more detail. The fan 22 is attached and fixed to the rotating shaft 24 of the motor 21 and is rotated around the rotating shaft 24 inside the casing 3. It is disposed to face the intake portion 12 that forms the rear surface of the casing 3. A storage space 33 for storing a PC board (printed circuit board) 31 that is a substrate and a negative ion generator 32 is formed in the upper side of the casing 3. In the present embodiment, the above-described switch 5 for instructing the operation of the blower unit 16 and the heater 17 is provided on the front side of the handle 2, and another switch 35 for instructing the operation of the negative ion generator 32 is provided on the handle 2. It is provided on the rear side. When the fan 22 is rotated by energizing the air blowing unit 16, a cylindrical air passage 28 is formed inside the housing 3 from the air intake unit 12 through the air blowing unit 16 and the heater 17 to the discharge unit 14. The

  The PC board 31 is located substantially immediately above the blower section 16, and the triac 37, which is a semiconductor switch element for cutting off the power supply to the heater 17, does not have to be wired by soldering connection, for example. Implemented directly in Here, the triac 37 is arranged not on the blowout port 27 side of the blower unit 16 in front of the heater 17 but on the wind inlet of the blower unit 16 facing the intake unit 12, that is, on the suction port 26 side. Therefore, the air blowing unit 16 is interposed between the triac 37 and the heater 17, and the triac 37 is placed at a position away from the heater 17 to be heated.

  In addition to the triac 37, electronic components constituting the control unit 38 and the power supply unit 39 are also mounted on the PC board 31. The control unit 38 receives operation signals from the switches 5 and 35 and controls the TRIAC 37, the motor 22, and the negative ion generator 32, which are the control targets, and the power source unit 39 is a TRIAC 37. In addition to the control unit 38, electric power necessary to operate the motor 22 and the negative ion generator 32 is supplied. In the present embodiment, when a control signal for heating the heater 17 is sent from the control unit 38, the triac 37 is turned on by the operating voltage from the power supply unit 39, and the heater 17 is connected to the power supply while being energized. When the triac 37 is turned off, the heater 17 is cut off from the power source.

  An insulating wall 41 as an insulator is disposed between the triac 37 and the intake portion 12. The insulating wall 41 is made of a plate-like insulating material, and is formed in a shape that covers all of the triac 37 and electronic components mounted on the PC board 31 when viewed from the back side of the main body 1. Since the TRIAC 37 is a component that generates heat when energized, its radiating fins are arranged toward the intake portion 12 on the airflow side, and the insulating wall 41 is on the airflow side of the TRIAC 37 facing the radiating fins. Provided. As a result, even if a metal pin or the like is inserted from the air intake portion 12 on the rear side of the hair dryer, it is blocked by the insulating wall 41 and does not come into contact with the radiating fins and electronic parts of the triac 37, thereby improving safety. It becomes possible.

  The insulating wall 41 is preferably provided with a vent hole 42 that does not allow the metal pin to pass therethrough. In FIG. 5, by providing a large number of vent holes 42 at positions not facing the triac 37 and the electronic component, contact with the triac 37 and the electronic component is reliably prevented. By ensuring the air permeability of the air passage 28 extending from the air intake portion 12 to the air blowing portion 16 by the air vent 42, it is possible to effectively suppress the reduction of the cooling effect of the triac 37 by providing the insulating wall 41.

  Also in this embodiment, when the switch 5 provided in the handle 2 is operated to blow air, the rotational force from the motor 21 is applied to the fan 22, and the fan 22 rotates continuously inside the casing 3. . As a result, air is sucked from the air intake portion 12 into the air blowing portion 16 in the housing 3, and air is sent from the discharge portion 14 to the hair facing the front surface of the housing 3 through the heater 17. Further, when the heater 17 is energized by operating another switch 5, the air blown from the blowout port 27 of the blower unit 16 is heated when passing through the heater 17 and is not cooled by the discharge unit 14. Hot air can be sent out.

  In particular, when the heater 17 is energized and warm air is sent out, the triac 37 mounted on the PC board 31 also generates heat. However, the air sucked from the air intake portion 12 as the fan 22 rotates rotates into the air holes 42 and the insulation. The air can flow into the radiating fin side of the triac 37 through the air passage 28 where the wall 41 does not exist, and heat can be effectively taken away from the triac 37. This heat passes through the blower unit 16 and is sent out together with the warm air heated by the heater 17 from the discharge unit 14 to the outside of the hair dryer without waste.

  Further, regarding the attachment of the triac 37, when the triac 37 is on the side of the fan 22 (the outlet 27 of the air blower 16) before the heater 17 as in the prior art, the triac 37 is heated. In addition to being exposed to the vicinity, wiring must be provided between the triac 37 and the PC board 31. In this regard, the triac 37 of the present embodiment is disposed on the suction port 26 side of the blower unit 16 and is located away from the heater 17 so that the triac 37 can be directly mounted on the PC board 31.

  As described above, in the present embodiment, the heater 17 serving as a heating unit serving as a heat source, the air blowing unit 16 for performing air blowing, the triac 37 serving as a semiconductor switching element that interrupts the power supply to the heater 17, and the triac 37 And a power supply unit 39 for supplying power for operating the TRIAC 37 and the control unit 38, and the TRIAC 37 is arranged on the suction port 26 side that is the air inlet of the blower unit 16. .

  In this case, by arranging the triac 37 not on the air outlet 27 side of the air blowing unit 16 in front of the heating unit but on the air inlet 26 side of the air blowing unit 16, each air path of hot air and cold air is purposely provided. Therefore, the triac 37 can be easily attached at a position away from the heater 17.

  Further, the triac 37 in the present embodiment is directly mounted on the PC board 31 as a substrate on which the power supply unit 39 is mounted.

  In this case, the triac 37 can be attached more easily by being directly mounted on the PC board 31 without being routed from the substrate by wiring.

  In this embodiment, an insulating wall 41 that is an insulator is provided on the air inlet side of the triac 37.

  In this case, even if a metal pin or the like is inserted from the air intake portion 12 of the hair dryer, the hair dryer is blocked by the insulating wall 41 and does not come into contact with the triac 37, and a hair dryer with improved safety can be provided.

  Furthermore, in this embodiment, the ventilation wall 42 is provided in the insulating wall 41. In this case, a small hole is formed in the insulating wall 41 so that a thin pin such as a wire does not pass through to ensure air permeability, thereby suppressing a reduction in the cooling effect of the triac 37 by the insulating wall 41 and heat dissipation of the triac 37. It is possible to provide a hair dryer with improved safety that prevents pins from coming into contact with fins.

  In the present embodiment, the semiconductor switch element that cuts off the power supply to the heater 17 may be other than the triac 37. Moreover, you may make the concept in this embodiment apply to a thin hair dryer like 1st Embodiment.

  In the present embodiment, the circuit configuration of the power supply unit 39 in the second embodiment is shown in FIG. In the figure, reference numeral 51 denotes a power supply for supplying power to the power supply unit 39, which is composed of either a commercial power supply 51A that generates a sinusoidal power supply voltage or an inverter power supply 51B that generates a rectangular wave power supply voltage. The power supply unit 39 converts the input voltage from the power supply 51 into, for example, a direct current of 5 V and supplies the converted voltage to a load 52 such as the control unit 38, for example.

  The power supply unit 39 includes a film capacitor 54, a thermal fuse 55, a resistor 56, a diode 57 that is a rectifying element, and a Zener diode 58 that is a constant voltage element. Among these, the film capacitor 54 and the inrush current prevention resistor 56 mounted on the PC board 31 as a substrate constitute a capacitor drop power supply circuit 59 that drops the voltage from the power supply 51. A diode 57 and a Zener diode 58 are respectively connected between both ends of a series circuit composed of a power source 51, a film capacitor 54, and a resistor 56, and a constant voltage, for example, DC 5V is applied between both ends of the Zener diode 58. The DC voltage is generated and supplied between both ends of the load 52.

  In this embodiment, a thermal fuse 55 is connected between the film capacitor 54 and the resistor 56. The thermal fuse 55 is provided beside (in the vicinity of) the resistor 56, and is disposed at a position where the thermal fuse 55 is blown by heat generated from the resistor 56 when the inverter power supply 51B is used.

  Next, the operation of the power supply unit 39 in the present embodiment will be described with reference to the waveform diagram of FIG. In the figure, the upper part (A) shows the power supply voltage when the commercial power supply 51A is connected as the power supply 51 and the peak current flowing through the resistor 56, and the lower part (B) shows the case where the inverter power supply 51B is connected as the power supply 51. The power supply voltage and the peak current flowing through the resistor 56 are shown.

  As is well known, the power supply voltage of the commercial power supply 51A is, for example, an AC 100V (effective value) sine waveform, and its maximum value is 141V. On the other hand, the power supply voltage of the inverter power supply 51B is a rectangular waveform having a maximum value of 141V.

  As shown in FIG. 7A, in the case of the commercial power supply 51A, the peak current (inrush current) is generated in the resistor 56 only once when the power supply voltage changes sharply. However, as shown in FIG. 7B, in the case of the inverter power supply 51B, the peak current flows at the rising edge of the power supply voltage waveform, and the peak current flows at the falling edge of the power supply voltage waveform. Four peak currents are generated. For this reason, the power consumption of the resistor 56 increases as compared with the case of the commercial power supply 51A, and the resistor 56 generates heat. When the resistor 56 generates heat, the thermal fuse 55 disposed on the side of the resistor 56 is blown under the influence of the heat from the resistor 56, and power supply from the power source 51 to the power source unit 39 is cut off.

  As described above, in the present embodiment, the power supply voltage from the power supply 51 is dropped by the capacitor drop power supply circuit 59 including the film capacitor 54 and the resistor 56, which are capacitors, and the temperature drop 55 is inserted into the capacitor drop power supply circuit 59, A fuse 55 is arranged beside the resistor 56 and provided at a position where the temperature fuse 56 is blown when the resistor 56 is heated. After the temperature fuse 56 is blown, the capacitor drop power supply circuit 59 is cut off, It is configured to stop heat generation.

  The conventional capacitor drop power supply circuit 59 is not provided with the thermal fuse 55, and when the inverter power supply 51B is used, the resistor 56 generates heat until the wiring pattern (not shown) formed on the PC board 31 is disconnected. There was a risk of continuing. However, in this embodiment, when the resistor 56 generates heat when a pseudo power source such as the inverter power source 51B is used, the thermal fuse 55 is blown by the thermal effect from the resistor 56, and the capacitor drop power circuit 59 is disconnected. Therefore, problems such as disconnection of the wiring pattern as in the prior art can be solved.

  FIG. 8 is a circuit diagram of an electromagnetic induction heating device showing a fourth embodiment of the present invention. In the figure, 61 is a detachable plug that is inserted into the outlet (not shown) of the commercial power source 51 </ b> A, and 62 is a cord reel that guides an AC power supply voltage to the input terminal 63. 64 is a rectifier stack as a rectifier that converts an AC power supply voltage into a DC voltage, 65 is a large capacity type current fuse that is inserted and connected to the input side of the rectifier stack 64, and uses a type with a rated current of 15 to 20A. Yes.

  Reference numeral 67 denotes an IH (electromagnetic induction heating) circuit that receives a DC voltage from the rectifying stack 64 and supplies a high-frequency current to the heating coil 68 that is a load. As is well known, this IH circuit 67 has a series circuit composed of a coil L1 and a capacitor C2 connected to the output end of the rectifying stack 64, and another capacitor C1 and an IGBT (insulated gate type) as a switching element between both ends of the capacitor C2. Bipolar transistor) 69 is connected, and a maximum of 1400 W of power (14 A current) is output to heating coil 68 connected between both ends of capacitor C1. Reference numeral 70 denotes an IGBT drive circuit that supplies a pulse drive signal to the gate that is the control terminal of the IGBT 69. The IGBT 69 receives the drive signal from the IGBT drive circuit 70 and is repeatedly turned on and off to oscillate the IH circuit 67. ing.

  Reference numeral 71 denotes an IH operation signal detection circuit that transmits a voltage, current, and the like generated by the IH circuit 67 to the microcomputer 74 described later as an operation signal. Reference numeral 72 denotes a DC power supply circuit that generates an operating voltage of 3 to 5 V DC, for example, from the DC voltage converted by the rectifying stack 64, and this operating voltage is supplied to the microcomputer 74 and the like. Reference numeral 74 denotes a microcomputer as a control unit, which sends a control signal to the IGBT drive circuit 70 on the basis of an operation signal from the IH operation signal detection circuit 71, and controls the IGBT 69 to be turned on / off. The circuit 67 is operated.

  The above is the configuration of a conventionally known electromagnetic induction heating device. However, if the emitter 69 and the collector of the IGBT 69 are short-circuited due to some cause, the plug 61 will be in the same state as when both ends are short-circuited. A current of 200 A or more flows through the device. If this state continues, the current fuse 65 is blown, and thereafter, no current flows through the IGBT 69.

  FIG. 9 shows the relationship between current and operating time in a general breaker provided on the commercial power supply 51A side and a 20A type current fuse 65 incorporated in the electromagnetic induction heating device. In the figure, a dotted line B1 indicates a breaker of a type that operates fast (fast-breaking type), and a dotted line B2 indicates a type of breaker that operates slowly (normal type). Similarly, a solid line F1 indicates a fast operation type (fast-breaking type) current fuse 65, and a dotted line B2 indicates a slow operation type (normal type) current fuse 65.

  As can be seen from this figure, when a current of 200 A flows, the breaker operates in 0.006 to 0.02 seconds, and the current fuse 65 operates in 0.02 to 0.07 seconds. For this reason, when the IGBT 69 is short-circuited and a current of 200 A or more flows, the breaker is actually dropped before the current fuse 65 is blown. Therefore, even if the breaker is returned, the breaker is again dropped. For this reason, conventionally, the user cannot understand what causes the breaker to repeatedly fall, causing confusion. Moreover, when such a phenomenon occurs at night, the user is further confused and troubled.

  If the device is removed from the outlet in this failed state, the breaker is restored, and the plug 61 of the failed device is inserted into the outlet again, this time the breaker falls again while generating a spark at the outlet, Users are surprised.

  In order to deal with such a problem, in this embodiment, a current fuse 81, a relay 82, and a relay drive circuit 83 are added to the above-described conventional configuration.

  Specifically, the current fuse 81 forms a series circuit together with the current fuse 65, and the series circuit is inserted and connected between one end of the input terminal 63 and the input end of the rectifying stack 64. The current fuse 81 has a smaller capacity than that of the current fuse 65, and for example, a type having a rated current of 0.1 to 3A is used. The relay 82 is configured to turn on or off the contact 82B according to the interruption of the coil 82A, and the contact 82B is connected in parallel with the current fuse 81. In addition, the microcomputer 74 detects that the plug 61 is removed from the outlet based on the operation signal from the IH operation signal detection circuit 71, or within a predetermined time, for example, within one second after the plug 61 is inserted, or the IH circuit 67 does not operate. When the electromagnetic induction heating by the heating coil 68 is stopped, the relay 82 is controlled so that the contact 82B is opened (off).

  In the present embodiment, if the emitter 69 and the collector of the IGBT 69 are short-circuited due to any cause, the plug 61 will be in the same state as if both ends of the plug 61 are short-circuited, and a large current of 200 A or more instantaneously flows to the device. Here, when the contact 82B of the relay 82 is off, a large current flows through the small-capacity current fuse 81 and immediately blows, thereby protecting the device. On the other hand, when the contact 82B of the relay 82 is on, no current flows through the current fuse 81. Therefore, like the conventional device, the breaker on the commercial power supply 51A side is dropped before the current fuse 65 is blown, and the device Protect. However, when the breaker is restored, the contact 82B of the relay 82 is off for 1 second, so that a large current flows through the current fuse 81 and immediately blows. Thereafter, the IH circuit 67 does not operate, and the contact 82B of the relay 82 does not turn on. Therefore, even if the breaker is returned as in the prior art, there is no problem that the breaker immediately falls.

  As described above, in this embodiment, in a load driving device such as an electromagnetic induction heating device that is mounted with, for example, the heating coil 68 that is a load that consumes a current of 10 A or more, which is a predetermined value, and that operates by feeding from the commercial power source 51A. A parallel circuit composed of a contact 82B of the relay 82 and a current fuse 81 of less than 10A which is a predetermined value is connected in series to a wiring path directly connected to the outlet of the commercial power supply 51A, and is inserted into the outlet for a predetermined time (for example, 0 Within 5 seconds), by opening the contact 82B, the current fuse 81 can be surely blown to protect the device.

  Also, instead of the current fuse 81, a pattern fuse is formed in a wiring pattern formed on the substrate by preparing a portion thinner than other patterns, and blown when a large current flows through the pattern fuse. If so, the cost can be reduced.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.

12 Intake part 14 Discharge part 17 Heater (heating part)
21 Motor 22 Fan 25 Electromagnet 26 Suction port (wind inlet)
31 PC board
37 Triac (Semiconductor switch element)
39 Power supply part 41 Insulation wall (insulator)
42 Vent hole

Claims (6)

The rotating part of the fan and motor are integrated,
An electromagnet for the motor is provided inside,
A hair dryer, wherein the fan is rotated by energizing the electromagnet, the air is taken into the interior, and the heated portion is blown to send the warmed air from the discharge portion to the outside.   The hair dryer according to claim 1, wherein an intake portion for taking in air is provided inside. A heating section as a heat source;
A blowing section;
A semiconductor switch element that cuts off power to the heating unit;
A power supply unit for operating the semiconductor switch element,
A hair dryer, wherein the semiconductor switch element is disposed at an air inlet of the air blowing section.   4. The hair dryer according to claim 3, wherein the semiconductor switch element is directly mounted on a substrate on which the power supply unit is mounted.   The hair dryer according to claim 3 or 4, wherein an insulator is provided on the air inlet side of the semiconductor switch element.   6. A hair dryer according to claim 5, wherein a vent hole is provided in the insulator.

Images