JPH0688096U - Heating element - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a heating element capable of adjusting the ratio of far infrared rays to short wavelengths and providing a desired heating feeling. The heating element has an electric heater 1 provided with a heating wire 3 inside a tube 2 and a coil 5 having a radiation coating 5a for radiating far infrared rays, which is wound around the outer periphery of the electric heater 1. Since the radiation coating 5a of the coil 5 wound around the electric heater 1 does not peel off from the body, the heating effect does not deteriorate. Further, the ratio of far infrared rays to short wavelengths can be adjusted by adjusting the coil pitch of the coil 5 wound around the electric heater 1 to be large or small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heating element mainly used for radiant heat of far infrared rays and used for an electric heating device such as an electric stove.

[0002]

[Prior art]

 Conventionally, in this type of heating element, as shown in FIG. 2, a ceramic 6 which emits far infrared rays is generally coated on the surface of a tube of an electric heater 1 made of a sheath heater by plasma spraying ( For example, JP-A-63-42947).

[0003]

[Problems to be solved by the device]

 Since the conventional heating element coats the ceramics 6 on the surface of the electric heater 1 in the state of a straight pipe, when the electric heater 2 is bent thereafter, the ceramics 6 peels from the surface of the electric heater 1 and the heating effect is obtained. There was a problem that

When the ceramics 6 is coated after the electric heater 1 is bent, it is necessary to coat the front surface, the back surface, and the side surfaces of the electric heater 1 on many sides, which requires many steps and is costly. Was becoming. Further, this type of heating element has a problem that it is difficult to obtain a strong feeling of heating because the surface temperature of the heating element is set to 500 ° C to 600 ° C in order to efficiently radiate the wavelength band of far infrared rays. It was

[0005]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and a heating element is an electric heater having a heating wire inside a tube, and a coil having a radiation coating for radiating far infrared rays on the outer periphery of the electric heater. Is wrapped around. Further, the radiation coating of the coil was made of a metal oxide generated in the coil made of iron-chromium wire.

[0006]

In the above structure, since the heating element has the coil having the radiation coating that radiates far infrared rays wound around the outer periphery of the electric heater, the radiation coating is not easily peeled off.

In addition, when the heating element is energized to heat the electric heater and the surface temperature thereof is set to 700 to 800 ° C., infrared rays of a short wavelength from the electric heater and a long wavelength of infrared rays from the heated coating of the coil are heated. Emits infrared rays. Further, the heating element can easily adjust the required ratio of far infrared rays to short wavelengths by adjusting the coil pitch of the coil wound around the electric heater to be large or small.

The radiation coating of the coil is made of a metal oxide, which is generated in the coil made of iron-chromium wire. Therefore, by heat-treating the coil made of iron-chrome wire in an oxidizing atmosphere, far infrared rays are emitted. It can easily have emissive metal oxides.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIG.

In the figure, reference numeral 1 denotes a cylindrical electric heater, which is, for example, a well-known sheathed heater. The electric heater 1 is provided with a heating wire 3 inside a tube 2 and is insulated in a gap between the tube 2 and the heating wire 3. It is configured by being filled with the functional filler 4. Further, the electric heater 1 may be a known quartz tube heater using an English tube for the tube 2.

Reference numeral 5 is a coil having a radiation coating 5a that radiates far infrared rays. The iron chrome wire is formed into a predetermined coil shape by setting the coil pitch according to the required ratio of far infrared rays to short wavelengths. It is heat-treated in an oxidizing atmosphere at 900 to 1100 ° C to produce a radiation coating 5a made of a metal oxide that radiates far infrared rays on the surface, and is formed into a predetermined shape by bending or the like. It is wound around the outer periphery of the heater 1.

Next, the operation of this embodiment will be described.

Since the coil 5 having the radiation coating 5a that radiates far infrared rays is wound around the entire length of the outer periphery of the electric heater 1 formed into a predetermined shape by bending or the like, the radiation coating 5a is a coil. No easy peeling from No. 5.

When the electric heater 1 is energized and heated to a surface temperature of 700 to 800 ° C., the heating element is longer than the infrared ray having a short wavelength from the electric heater 1 and the radiant coating 5 a of the heated coil 5. It emits far infrared rays with a wavelength. Further, the heating element can easily adjust the required ratio of far infrared rays to short wavelengths by adjusting the coil pitch of the coil 5 wound around the electric heater 1 to be large or small.

Further, since the radiation coating 5a of the coil 5 wound around the electric heater 1 is made of a metal oxide produced in the coil made of iron-chromium wire, the coil 5 made of iron-chrome wire is used. Can easily have a metal oxide which emits far infrared rays by heat treatment in an oxidizing atmosphere.

[0016]

[Effect of device]

 As described above, according to the present invention, the heating element does not easily peel off the radiation coating, and emits short-wave infrared rays from the electric heater and far-infrared rays having a longer wavelength than the radiation coating of the heated coil. The heating element can easily adjust the required ratio of far infrared rays to short wavelengths by adjusting the coil pitch of the coil wound around the electric heater to a large or small amount.

Therefore, in the heating element, since the radiation coating that radiates far infrared rays is not peeled off, the heating effect is not deteriorated. In addition, by adjusting the ratio of far infrared rays to short wavelengths, it is possible to provide a heating element that achieves a desired heating feeling by appropriately mixing high efficiency heating by far infrared radiation and a strong heating feeling due to short wavelengths.

Further, since the radiation coating of the coil of the heating element is made of the metal oxide generated in the coil made of iron-chromium wire, the heating element makes the coil made of iron-chromium wire in the oxidizing atmosphere. The heat generating element can be inexpensive because it can be easily heat-treated to have a metal oxide that emits far infrared rays.

[Brief description of drawings]

FIG. 1 is a partially sectional plan view showing a heating element according to an embodiment of the present invention.

FIG. 2 is a plan view showing a heating element of a conventional example.

[Explanation of symbols]

 1 Electric Heater 2 Tube 3 Heating Line 5 Coil 5a Radiant Coating

Claims (2)

[Scope of utility model registration request] 1. An electric heater (1) provided with a heating wire (3) inside a tube (2) and an outer periphery of the electric heater (1),
A heating element, characterized in that a coil (5) having a radiation coating (5a) for radiating far infrared rays is wound. 2. A radiation coating (5a) on the coil (5).
The heating element according to claim 1, wherein the heating element is made of a metal oxide formed in a coil made of iron-chromium wire.