JP3229618B2 - Electric heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heater in which a heating element formed by winding a heating wire around a core material is disposed in a heater body, and heating is performed by controlling energization of the heating wire. It is.

[0002]

2. Description of the Related Art A conventional electric heater will be described with reference to an electric carpet. In a conventional electric carpet, a heating element and a heat-sensitive element are disposed in a meandering manner on a backing made of felt or the like having good heat insulating properties, and a tactile outer cloth is adhesively fixed to the backing to form a heater body, A controller is provided at a corner of the heater body, and the controller is provided with a control circuit for controlling energization of the heater and controlling the surface temperature of the heater body to a set temperature. As shown in FIG. 6, a heating wire 22 made of a copper alloy is spirally wound around a core material 21 made of polyester or the like, and nylon or the like that melts when the heating wire 22 is overheated due to an abnormal temperature rise. A detection wire 24 for detecting that the melting layer 23 has melted is spirally wound around the melting layer 23, and the detection wire 24 is insulated by a heat-resistant PVC or the like. Was formed by being covered with

[0003]

However, in the electric carpet having the above configuration, a magnetic field is generated by the current flowing through the heating wire. When the flowing current is a direct current, a constant magnetic field is generated. When the flowing current is an alternating current, a magnetic field that changes according to the frequency is generated. In addition, a magnetic field was also generated by unnecessary high frequency (noise) or the like. Among the magnetic fields generated in this way, those having a high frequency had an adverse effect on other electric devices as electromagnetic noise. In addition, it is said that there is a possibility that some of the low-frequency ones may adversely affect the human body recently,
It was very problem in electric heater for heating the human body.

[0004] Electrical heating device according to the present invention has been made in view of the problems described above, the heating body to have been provided two two-layer or parallel to the heating wire of the heating element disposed, Re Re Husband Husband of
It is an object of the present invention to control a current flowing to a heating wire so that generated magnetic fields cancel each other, thereby preventing an adverse effect due to electromagnetic noise.

[0005]

In order to achieve the above object, an electric heater according to the present invention heats a heating element comprising a first heating wire and a second heating wire which are arranged adjacent to each other with an insulator interposed therebetween. An electric heater that is disposed on the main body of the heater and heats the first heating wire and the second heating wire of the heating element to perform heating, in a heating state, a magnetic field generated by energizing the first heating wire; The first heating wire and the second heating wire are connected to each other using a connection point provided on a controller as a turning point so that the second heating wire is energized only in a direction in which a magnetic field generated by energization cancels each other. . Further, the heating element has a two-layer structure in which a first heating wire and a second heating wire are concentrically wound with an insulator interposed therebetween, or the first heating wire and the second heating wire are parallelly arranged with an insulator interposed therebetween. It is the structure arranged in.

[0006] Further, the in the first heating line and the second heating line
Is a two-layer structure that is concentrically wound with an insulator
The upper SL heating element winding a first heating wire in the core material, a structure formed by winding the second heating line in the same direction through the insulator to the outer periphery, the second heating line in the first It is wound so as to overlap the heating wire.

[0007]

[Action] Electrical heaters having the above structure, the first shot hot wire and the second
Through power is heating is carried out to the calling hot wire. At this time, the currents flowing to the respective heating wires are controlled, and the generated magnetic fields cancel each other, thereby preventing adverse effects due to the magnetic fields.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the electric heater according to the present invention will be described with reference to the drawings in an electric carpet. As shown in FIGS. 1 to 3, the electric carpet of the present invention has a backing cloth 1 made of a material having good heat insulating properties (eg, polyester felt).
A heating element 2 that generates heat by energization and a heat-sensitive element 3 that detects the temperature of the carpet (the temperature of the heating element 2) are arranged in a meandering manner. A surface cloth 4 made of tufted cloth or the like is bonded and fixed, and the entire periphery thereof is overlock-stitched to form a carpet body 5. A controller 7 having a control circuit 6 for controlling the energization of the heating element 2 based on the temperature detected by the heating element 3 is provided at a corner of the carpet body 5.

The heating element 2 is formed by spirally winding a first heating wire 9 made of a copper alloy around a core material 8 made of polyester or the like.
The first heating wire 9 is covered with a heat-resistant insulator 10 having no pinhole, such as polyimide, and the first heating wire 9 is
A second heating wire 11 similar to the above is spirally wound, and the second heating wire 11 is covered with a melting layer 12 that melts (melts at around 170 ° C.) when overheating occurs due to an abnormal temperature rise. A detecting wire 13 for short-circuiting the second heating wire 11 and operating the safety device by the melting of the melting layer 12 by the melting of the melting layer 12 is spirally wound. It is formed by covering with.

[0010] One end of the first heating wire 9 is connected to the control circuit 6 of the controller 7, and the other end of the first heating wire 9 is connected to one end of the second heating wire 11 in the controller 7. The other end of the second heating wire 11 is connected to the control circuit 6, and the detection wire 13 and the thermosensitive element 3 are connected to the control circuit 6. Since the connection point between the first heating wire 9 and the second heating wire 11 is connected as a turning point, when current is supplied, current flows through the first heating wire 9 and returns from the connection point to return to the second heating wire. The current flows in the first heating wire 9 and the second heating wire 11 in opposite directions at all times.

[0011] Upon explain the operation of the electric carpet having the above structure, the first heating line 9 from the control circuit 6 and the second heating wire 11
When the first heating wire 9 and the second heating wire 11 generate heat and the temperature rises, the heat sensing element 3 detects this temperature,
The control circuit 6 controls energization of the first heating wire 9 and the second heating wire 11 based on the detection signal of the heat sensing element 3 to perform heating at a desired temperature.

At this time, since current flows in the first heating wire 9 and the second heating wire 11 in opposite directions, the first heating wire 9
The magnetic field generated by the second heating wire 11 and the second heating wire 11 are reversed, and cancel each other to prevent the generation of electromagnetic noise.

Next, a second embodiment of the electric heater according to the present invention will be described. A detailed description of the same parts as in the first embodiment will be omitted. In the electric carpet of the present invention, the heating element 15 disposed on the carpet body 5 spirally winds the first heating wire 9 around the core material 8 made of polyester or the like.
The second heating wire 11 is spirally wound around the core material 8, the first heating wire 9 and the second heating wire 11 are arranged in parallel and covered with a melting layer 12, and the detection wire 13 is spirally wound around the melting layer 12. And the detection wire 13 is covered with an insulating jacket 14.

The first heating wire 9 and the second heating wire 1
1 are connected in the same manner as in the first embodiment, and the magnetic fields generated during energization are canceled each other to prevent the generation of electromagnetic noise.

[0015]

The electric heater of the present invention has a first heating wire and a second heating wire.
(2) Turn the heating wire back at the connection point provided on the controller
Only by connecting the first heating wire and the second heating wire.
The generated magnetic fields always cancel each other in the heating state
Can be configured to work together
The work can be performed very easily and reliably. Also warm
At the time of the chamber, the first heating wire and the second heating wire
A heater in which the generated magnetic fields always cancel each other out
And can always prevent adverse effects on the human body due to electromagnetic noise.
You. Then, the first heating wire is wound around the core material, and the outer periphery is
A structure in which the second heating wire is wound in the same direction via an edge
Then, wind the second heating wire so as to overlap the first heating wire.
With heating element, cancellation of the magnetic field Ru effectively der.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a first embodiment of an electric heater according to the present invention.

FIG. 2 is an enlarged view of a main part of the first embodiment of the electric heater according to the present invention.

FIG. 3 is an electric circuit diagram of the electric heater of the present invention.

FIG. 4 is an enlarged view of a main part of a second embodiment of the electric heater according to the present invention.

FIG. 5 is a sectional view of a main part of a second embodiment of the electric heater according to the present invention.

FIG. 6 is a partially enlarged view of a conventional electric heater.

[Explanation of symbols]

 2 Heating Element 3 Heat Sensitive Element 5 Carpet Body 6 Control Circuit 8 Core Material 9 First Heating Wire 10 Heat Resistant Insulator 11 Second Heating Wire 12 Melting Layer 13 Detection Wire 14 Insulation Jacket

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-252080 (JP, A) JP-A-2-220388 (JP, A) JP-A-2-129882 (JP, A) JP-A-1- 276634 (JP, A) JP-A-63-85776 (JP, A) JP-A-62-108484 (JP, A) JP-A-2-128395 (JP, U) JP-A-62-144089 (JP, U) 58-138290 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24D 13/02 H05B 3/00 370 H05B 3/10

Claims (4)

(57) [Claims] 1. A method according to claim 1, further comprising:
In a heating state, a heating element including a heating wire and a second heating wire is disposed in a heater main body, and the first heating wire and the second heating wire of the heating element are heated by heating. The first heating wire and the second heating wire such that the magnetic field generated by the conduction of the first heating wire and the magnetic field generated by the conduction of the second heating wire are conducted only in directions that cancel each other out.
Is connected as a turning point provided on the controller . 2. The electric heater according to claim 1, wherein the heating element has a two-layer structure in which a first heating wire and a second heating wire are concentrically wound via an insulator. 3. The electric heater according to claim 1, wherein the heating element has a structure in which a first heating wire and a second heating wire are arranged in parallel via an insulator. 4. The heating element has a structure in which a first heating wire is wound around a core material, and a second heating wire is wound around the outer periphery of the heating member via an insulator in the same direction. electrical heating device according to 請 Motomeko 2 wound to overlap the heating wire.