JP2897083B2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air heater that uses a heat generated by electric energy to blow hot air into a room or the like by a fan.

[0002]

2. Description of the Related Art A conventional heater of this type is usually provided with a fan behind a heater such as a sheath heater and a halogen heater, and energizes the heater and the fan to cool the heated heater and protect the heater. The heated air is blown out from the hot air outlet as warm air.

[0003]

In the conventional hot air heater described above, the heater heated by the fan is cooled, and the heated air is sent as hot air. In order to obtain the amount of heat, the structure must be large, and if the cooling is uneven or insufficient, the temperature of the heater will rise partially and it will be damaged easily, and the life of the heater will be shortened. There was a problem that it became shorter.

[0004] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a hot-air heater having a small size, light weight, a large heat dissipation effect, and a longer life of a heating element. It was done.

[0005]

SUMMARY OF THE INVENTION A hot air heater according to the present invention includes an outer case, an inner case disposed in the outer case, and a guide disposed between the inner case and the outer case. Heating means, means for supplying high-frequency current to the induction heating means, a fan disposed in the inner case and generating heat by electromagnetic induction, a motor for driving the fan, and a guard disposed on the front of the fan It consists of a plate.

Further, an outer case made of a non-magnetic material and having a substantially U-shaped cross section having an air inlet on the back surface, and an inner case made of a non-magnetic material and having a ventilation hole near the center and disposed in the outer case. A case, an induction heating means which is provided between the outer case and the inner case and has a coil frame provided with an air hole near the center where the induction heating coil is mounted, and a high frequency current is supplied to the induction heating means; A disk-shaped fan disposed in the inner case with a plurality of blades attached to the front surface and made of a magnetic material; a motor disposed in the outer case to drive the fan; The guard plate is made of a material, has an air intake hole near the center, is disposed on the front surface of the fan, and forms a hot air outlet between itself and the outer case.

Further, the induction heating means includes an induction heating coil disposed in a groove formed with a partition wall in a coil frame made of an insulating material.

Further, a means for supplying a high-frequency current to the induction heating means is provided with a variable frequency controller.

[0009]

When the power supply is turned on and a high-frequency current flows through the induction heating coil, the fan rapidly generates heat by the electromagnetic induction action and heats the blades. Further, the motor is driven to rotate the fan. As a result, the surrounding air is taken into the inner case, cools the fan, absorbs the heat of the fan, is heated, and is blown out as warm air. At this time, the temperature of the hot air is adjusted by controlling the variable frequency controller.

[0010]

1 is a sectional view of an embodiment of the present invention. In the figure, 1 is an outer case of a hot air heater having a substantially U-shaped cross section,
For example, an insulating material having heat resistance and transmitting electromagnetic waves, such as heat-resistant plastic, that is, an insulating material that does not generate heat due to electromagnetic induction, is provided with a large number of ventilation holes 2 in the bottom plate.

Reference numeral 3 denotes an induction heating device disposed in the outer case 1, reference numeral 4 denotes a coil frame, and reference numeral 7 denotes an induction heating coil (hereinafter referred to as a coil). The coil frame 4 is made of an insulating material that has heat resistance such as heat-resistant plastic or ceramics and that transmits electromagnetic waves, that is, an insulating material that does not generate heat due to electromagnetic induction, and has an upper surface as shown in FIGS. , A spiral groove 5 is provided with a partition wall 6 interposed therebetween. In the embodiment, the width d _{1 of the} groove 5 is set to about 90% of the diameter d of the coil 7, and the width w of the partition 6 is set to about 70% of the diameter d of the coil 7, and the coil 7 is slightly elliptical. Then, it was press-fitted into the groove 5. The width d ₁ of the groove 5 may be formed to be substantially equal to or slightly larger than the diameter d of the coil 7, and the coil 7 may be fixed in the groove 5 with a heat-resistant adhesive. Reference numeral 8 denotes a recess for mounting a motor 11 for driving a blower turbo fan 20, and 9 denotes a motor 1
Holes 10 through which one output shaft 12 is inserted are a plurality of air inlets provided around the recess 8.

As described above, the induction heating apparatus 3 according to the present invention
Is fixed in the groove 5 with the partition wall 6 interposed therebetween. Since the coil frame 4 is made of an insulating material, there is no need to perform special insulation treatment between the coils 7, so that a so-called loosely wound coil is formed. doing.

Reference numeral 15 denotes an inner case fixed to the outer case 1 provided on the front surface of the induction heating device 3, which has heat resistance similar to the outer case 1 and is made of an insulating material which does not generate heat by electromagnetic induction. The portion is provided with a hole 16 through which the output shaft 12 of the motor 11 is inserted. Reference numeral 17 denotes a plurality of ventilation holes provided around the hole 16.

Reference numeral 20 denotes the motor 11 in the inner case 15.
A blower turbo fan fixed to the output shaft 12 of the magnetic material having high resistivity and high relative permeability as shown in FIG.
That is, a disk 21 made of a material generating heat by electromagnetic induction, and a plurality of blades 22 made of a light metal material such as aluminum fixed radially on the surface of the disk 21.
And is constituted by. Reference numeral 23 denotes a mounting hole provided at the center of the disk 21 for fixing to the output shaft 12 of the motor 11. Reference numeral 24 denotes a guard plate provided on the front surface of the outer case 1. A plurality of air intake holes 25 are provided in the vicinity of the center, and a hot air outlet 26 is formed around the holes.

FIG. 5 is a circuit diagram showing an embodiment of a drive circuit of the induction heating apparatus 3, in which 31 is a full-wave rectifier circuit, 32 is a smoothing capacitor connected to its output side, 7 is a coil, and 33 is a coil 7 A switching element connected in series; 34, a resonance capacitor connected in parallel to the coil 7; 35, a regenerative diode connected in parallel to the switching element 33;
36 is a frequency variable controller that outputs a variable frequency to the switching element 33 according to a frequency control signal, and 37 is a power plug. It should be noted that the drive circuit of the motor 11 is omitted in the figure.

In the above-described drive circuit, an alternating current from a power supply is converted into a direct current by a full-wave rectifier circuit 31 and smoothed by a smoothing capacitor 32 to form a resonance circuit comprising the induction heating coil 7 and a resonance capacitor 34. Added. On the other hand, the output of the variable frequency controller 36 is applied to the switching element 33 to turn it on and off, and a high frequency current flows through the coil 7. The frequency of the high-frequency current flowing through the coil 7 is controlled by the frequency variable controller 36.

Next, the operation of the present invention configured as described above will be described. First, the power supply is turned on, and the drive circuit shown in FIG.
Pass a high frequency current of about z. A magnetic flux is generated by the excitation of the coil, and an alternating eddy current is generated in the disk 21 of the blower turbofan 20 by the electromagnetic induction action, and the disk 21 rapidly generates heat and heats the blade plate 22 attached thereto. I do. On the other hand, when the power is turned on, the motor 11 is driven, and the blower turbo fan 20 fixed to the output shaft 12 is rotated.

When the blower turbo fan 20 rotates, a negative pressure is generated in the vicinity thereof, so that the air behind the outer case 1 passes from the air inlet 2 through the ventilation hole 10 of the coil frame 4 and the ventilation hole 17 of the inner case 15. Inner case 15 and blower turbo fan 20
While moving along the disk 21
Is cooled and heated by absorbing the heat of the disk 21 to become hot air and blown out from the hot air outlet 26 to the outside. In addition, air in front of the outer case 1 is taken in from the air intake hole 25 of the guard plate 24 between the guard plate 24 and the blower turbofan 20 and moves along the disk 21 while the disk 21
In addition to cooling the blades 22, the blades 22 absorb the heat and are heated to become hot air and blown out from the hot air outlet 26 to the outside.

FIG. 6 is a sectional view of another embodiment of the present invention. In the embodiment of FIG. 1, the coil 7 of the induction heating device 3 is provided on the outer case 1 side of the coil frame 4, but in the present embodiment, the coil 7 is provided on the inner case 15 side of the coil frame 4. Even with such a configuration, the same effect as in the embodiment of FIG. 1 can be obtained.

In the above description, the example of the induction heating device 3 in which the coils 7 are sparsely arranged at equal intervals in a spiral shape is shown, but the coils 7 may be arranged in a square or any other pattern.

[0021]

As is clear from the above description, the present invention is designed to make the fan itself generate heat by the electromagnetic induction, so that the heater can be reduced in size, weight and thickness.
A hot air heater with high heat dissipation efficiency can be realized.

In addition, since the coil is insulated by the partition by using the induction heating device in which the coil is mounted in the groove formed by separating the partition from the coil frame made of an insulating material, it is necessary to perform an insulating process in particular. Since the coil is loosely wound, deformation and the like due to local heating of the fan can be prevented, and the life can be extended.

Furthermore, since the high-frequency current flowing through the coil is controlled by the variable frequency controller to adjust the temperature of the hot air, it is possible to obtain a hot-air heater that is excellent in hot-air controllability and easy to use. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the blower turbofan of FIG. 1;

FIG. 3 is a sectional view of an embodiment of the induction heating device of FIG. 1;

FIG. 4 is a partially enlarged sectional view of FIG. 3;

FIG. 5 is a circuit diagram of an embodiment of a drive circuit of the induction heating device.

FIG. 6 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer case 2 Air inlet 3 Induction heating device 4 Coil frame 5 Groove 6 Partition wall 7 Induction heating coil 10, 17 Vent hole 11 Motor 15 Inner case 20 Ventilation turbo fan 21 Disk 22 Blade plate 24 Guard plate 25 Air intake hole 26 Hot-air outlet 31 Full-wave rectifier circuit 33 Switching element 34 Resonant capacitor 36 Frequency variable controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24H 3/04 302 H05B 6/02-6/14

Claims (4)

(57) [Claims] 1. An outer case, an inner case disposed in the outer case, an induction heating means disposed between the inner case and the outer case, and a high-frequency current supplied to the induction heating means. A hot air heater comprising: a supply unit; a fan disposed in the inner case and generating heat by electromagnetic induction; a motor for driving the fan; and a guard plate disposed in front of the fan. 2. An outer case made of a non-magnetic material and having a substantially U-shaped cross section having an air inlet on the back surface, and a ventilation hole made of a non-magnetic material and having a ventilation hole near a central portion, and disposed in the outer case. An inner case, an induction heating means provided with an induction heating coil, a coil frame provided with an air hole in the vicinity of the center thereof and disposed between the outer case and the inner case, and a high-frequency current supplied to the induction heating means. And a disk-shaped fan, which is made of a magnetic material and has a plurality of blades attached to the front surface thereof and is disposed in the inner case, and a motor which is disposed in the outer case and drives the fan. And a guard plate made of a non-magnetic material, having an air intake hole near the center thereof, disposed on the front of the fan, and forming a hot air outlet with the outer case. 3. The warm air heater according to claim 1, wherein the induction heating means includes an induction heating coil disposed in a groove formed by separating a partition from a coil frame made of an insulating material. 4. The hot air heater according to claim 2, wherein a means for supplying a high-frequency current to the induction heating means is provided with a variable frequency controller.