JPH044390Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a far-infrared radiator that emits far-infrared rays for drying or heating articles.

[Conventional technology]

Conventionally, substances that emit far infrared rays have been treated as electricity, gas,
It was heated indirectly using a heater that uses kerosene as energy.

For example, as shown in FIGS. 4 and 5, even if electricity is supplied to the sheathed heater 9 and the central nichrome wire 10 generates heat, the surrounding heat-resistant inorganic insulator 11 and the sheath tube 12 covering it , because heat is transmitted to the far-infrared emitting material 14 via the metal plate 13 disposed adjacent to the sheath tube 12 (note that 1
5 is a reflector, 16 is a heat insulating material, and 17 is an outer casing), heat conduction is not very good, it takes time for heat to be transferred to the far-infrared emitting material 14, and the temperature rises compared to the amount of electricity supplied. It had the disadvantage of low thermal efficiency.

To solve these drawbacks, there is a method in which a metal resistor layer is attached to a metal plate via an insulating plate, and a far-infrared radiation emitting layer is attached to this metal resistor layer.

However, the insulating plate and the far-infrared emitting layer are generally made of ceramic, which has a smaller coefficient of thermal expansion and poorer ductility than a metal resistor layer, so thermal shock resistance becomes a problem.

This idea was made in view of the above circumstances.
It is an object of the present invention to provide a far-infrared radiator that has a high-speed response that increases the temperature to a predetermined temperature in a short time, has good thermal efficiency, and has excellent mechanical and thermal shock resistance.

[Means for solving problems]

The structure of the present invention to achieve the above object is to form a hard alumite film on the surface of an aluminum plate, form a ceramic sprayed insulating layer on the surface of the alumite film, and form a ceramic sprayed insulating layer on the surface of the insulating layer as a resistance heating element. It is characterized by forming an alloy sprayed layer.

[Operation] A current is passed through the alloy sprayed layer as a resistance heating element to generate heat by Joule heat, and the alumite coating is heated by heating the alumite coating in which the alloy sprayed layer is integrated with the ceramic sprayed insulation layer. efficiently rises to a predetermined temperature in a short time and emits far-infrared rays.

〔Example〕

FIG. 1 is a plan view of the far-infrared radiator 4, and FIG. 2 is a longitudinal sectional view of a portion thereof.

A hard alumite film 5a with a thickness of 90 to 100 μm is formed on an aluminum plate (JIS5052) 5 with a thickness of 2 mm, a width of 160 mm, and a length of 400 mm, and this hard alumite film 5a is further blasted to a thickness of 75 to 85 μm.
The surface roughness is 10 to 20 μm, and a ceramic insulating layer 7 is formed on the surface, for example, Al ₂ O ₃ −TiO ₂ with a thickness of 10 to 20 μm.
An insulating layer is provided by thermal spraying. Next, the surface of the ceramic sprayed insulation layer 7 is coated with Ni (80% by weight)-Cr (20% by weight).
(% by weight) alloy powder was thermally sprayed in a pattern as shown in FIG. 1, and an alloy layer 6 as a resistance heating element was welded. The thickness of the alloy sprayed layer 6 is 25 μm, and the band width is 22
mm, total length 2200mm, total resistance value 14 ohm,
I got a 700W heater by connecting it to a 100V power supply.

As shown in FIG. 3, a ceramic insulating layer 8 is further provided on the outside of the alloy sprayed layer 6.
may be sealed inside to improve thermal efficiency.

Furthermore, in the above embodiments, the surface roughness due to the blast processing was set to 10 to 20 μm, but a surface roughness of about 3 to 20 μm is satisfactory.

In addition to the Ni-Cr alloy, the alloy for the resistance heating element is preferably a heat-resistant alloy with high electrical resistance such as a Fe-Ni-Cr alloy or a Ni-Cu-Mn alloy. and,
The resistance value can be adjusted by changing the thickness, band width, and total length of the alloy sprayed layer 6.

[Effect of idea]

As explained above, the present invention provides the following effects.

Since the alloy sprayed layer as a resistance heating element is integrally welded to the hard alumite film via the ceramic sprayed insulating layer, the alumite film is also heated at the same time as electricity is applied, and far infrared rays are emitted from the surface of the alumite film. In this way, it is possible to provide a far-infrared radiator with good thermal efficiency, excellent heat-up properties, and high-speed response.

Since the substrate body of the far-infrared radiator is an aluminum plate, it is strong and durable.

The metal substrate body (aluminum) and the far-infrared emitting layer (alumite film) are tightly bonded and have excellent mechanical and thermal impact resistance.

In addition, since the ceramic insulation layer that insulates the metal substrate body (aluminum) is adhered to the alumite film, the difference in thermal expansion coefficient is reduced compared to when it is applied to ordinary metal, and the thermal Good impact resistance.

Furthermore, since the ceramic insulating layer and the alloy layer as the resistance heating element are formed by thermal spraying, they have porosity and can absorb differences in thermal expansion, improving thermal shock resistance and improving mechanical resistance. It also has excellent adhesion.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a plan view of a far-infrared radiator, FIG. 2 is a vertical sectional view of a portion thereof, and FIG. 3 is a longitudinal sectional view of a portion of the far-infrared radiator. FIG. 4 is a vertical sectional view of a portion of the conventional example, and FIG. 5 is a perspective view of a portion of the sheathed heater. 4 is a far-infrared radiator, 5 is an aluminum plate, 5
a is an alumite film, 6 is an alloy sprayed layer, and 7 and 8 are ceramic sprayed insulation layers.

Claims (1)

[Scope of utility model registration request] Far infrared rays characterized by forming a hard alumite film on the surface of an aluminum plate, forming a ceramic sprayed insulating layer on the surface of the alumite film, and forming an alloy sprayed layer as a resistance heating element on the surface of the insulating layer. radiator.