JPH07105215B2 - Far infrared heater lamp - Google Patents

Description

The present invention relates to a far-infrared heater lamp, and particularly to far-infrared rays having a wavelength of 3 μm or more used for heaters such as stoves and kotatsu, dryers, medical devices and the like. The present invention relates to a far-infrared heater lamp that radiates light to.

[Background of the Invention]

Generally, in a far-infrared heater lamp that emits far-infrared rays having a wavelength of 3 μm or more, a far-infrared radiation composition film is formed on the outer surface of quartz glass that forms the enclosure of an incandescent light bulb in order to efficiently emit far-infrared rays. ing.

Conventionally, this far infrared radiation composition film has a zircon oxide-titanium oxide (ZrO ₂ —TiO ₂ ) composition, a lithium oxide-aluminum oxide-silicon dioxide (Li ₂ O—Al ₂ O ₃ —S
It is formed from ceramics such as iO ₂ ) composition, transition element oxide, alkali metal oxide, and alkaline earth metal oxide.

The far-infrared radiation composition film made of such ceramics absorbs heat energy from the tungsten filament of the incandescent light bulb, the component is activated, and an electromagnetic wave having a wavelength peculiar to the substance is radiated.

[Problems to be solved by the invention]

However, the conventionally known far-infrared radiation composition film has a large difference in the coefficient of thermal expansion with respect to the quartz glass of the encapsulation in which it is formed, and therefore the film undergoes cracking, peeling, etc. due to heat cycles during use. There is a drawback, especially in the case of a far-infrared radiation composition film containing a pigment such as titanium oxide, the color of the surface of the lamp is discolored when the temperature of the lamp is increased, which lowers the commercial value, and the hardness of the film is small, and the film is easily worn. In reality, it is not possible to obtain an excellent far infrared heater lamp that has a point and, in the end, emits far infrared rays with high efficiency.

[Object of the Invention]

The present invention has been made based on the above circumstances, and an object thereof is to provide a far infrared heater lamp that radiates far infrared rays in a wavelength range of 3 to 100 μ with high efficiency and has a long life. It is in.

[Means for solving problems]

The far-infrared heater lamp of the present invention has a total weight of 100% by weight, 70% by weight or more of silicon dioxide, aluminum oxide and phosphorus pentoxide. It is characterized in that a far-infrared radiation composition film made of phosphorous oxide is provided on the surface of an incandescent bulb enclosure made of quartz glass.

[Advantageous effects of the invention]

The far-infrared radiation composition film in the heater lamp of the present invention has a silicon dioxide (SiO ₂ ) content of 70% by weight or more, aluminum oxide (Al ₂ O ₃ ), and phosphorus pentoxide (P ₂ O ₅ ). Since it has a specific composition with 3 to 5 times the amount of phosphorus oxide of aluminum oxide (Al ₂ O ₃ ),
As is clear from the examples described below, the far-infrared radiation composition film has improved adhesion to quartz glass and can prevent cracking and peeling.

Silicon dioxide is one of the main components of radiation, and its proportion is
When the content is 70% by weight or less, a difference in thermal expansion coefficient from that of quartz glass is caused, cracks in the film are caused due to heat cycles, and the film is finally peeled off.

Aluminum oxide, together with silicon dioxide, is a radiative main component and is effective in improving the strength of the film and the adhesion to quartz glass by interacting with a phosphorus oxide such as phosphorus pentoxide.

Phosphorus oxide is an oxide effective for increasing the adhesion between the quartz glass and the film, but when the phosphorus oxide is converted into phosphorus pentoxide, it is less than 3 times the amount by weight of aluminum oxide. If the adhesion to quartz glass is insufficient and the amount exceeds 5 times, the far infrared radiation amount tends to be insufficient. Further, phosphorus oxide is also effective as a curing agent for increasing the strength of the film.

The far-infrared radiation composition film made of such a composition has good thermal conductivity because it has a thermal expansion coefficient close to that of quartz glass,
Far-infrared rays can be satisfactorily radiated over a long period of time with high efficiency without peeling, distortion, cracks, or the like.

[Specific Configuration of the Invention] Hereinafter, the present invention will be specifically described.

The heater lamp of the present invention is manufactured, for example, as follows.

A fine powder consisting of 70% by weight or more of silicon dioxide, aluminum oxide, and phosphorus pentoxide in an amount of 3 to 5 times that of aluminum oxide is dispersed in water to obtain a coating solution of 20 to 50% by weight. The liquid is evenly applied to the surface of the envelope of the incandescent lamp made of quartz glass with a spray gun, for example. The thickness of this coated film is 10 in consideration of peelability and far infrared radiation.
The range is preferably from 300 to 300μ, particularly preferably from 50 to 200μ.

Next, the heater lamp coated with the coating liquid is kept in an atmosphere furnace at 150 ° C. for 5 minutes or more to dry the water.

Further, the dried heater lamp is kept in an atmosphere furnace at 260 to 350 ° C. for 15 minutes or more to cause a chemical reaction in the film to perform a thermosetting process for decomposing and evaporating water of crystallization in the film.

[Example 1] Silicon dioxide 89.7% by weight, aluminum oxide 1.9% by weight
A fine ceramic powder containing 8.4% by weight of phosphorus pentoxide is dispersed in water at a ratio of 23% by weight to form a coating solution, and the coating solution is used as an outer surface of an envelope made of quartz glass of an incandescent lamp. Was applied to. Next, heat this incandescent bulb to 150 ° C
After keeping the incandescent lamp for 5 minutes to dry the water, the dried incandescent lamp is kept in an atmosphere furnace at 300 ° C for 15 minutes to perform a heat curing treatment, so that the far-infrared radiation composition is applied to the outer surface of the incandescent lamp. A material film was formed to manufacture a heater lamp.

On the other hand, for comparison, an incandescent light bulb identical to the above incandescent light bulb having no far-infrared radiation composition film formed on the outer surface was prepared and subjected to the next comparative test.

In this comparative test, 100 cc of water was placed in a beaker with a capacity of 100 cc, a heater lamp was placed at a position 50 mm above the surface of the water, the lamp was turned on, and water with a depth of 15 mm from the surface of the water when heated for 90 minutes was used. The temperature was measured.

The results are shown in FIG. In the figure, curve A shows the case of the far infrared heater lamp of the present invention, and curve B shows the case of the comparative incandescent lamp. As is clear from FIG. 1,
Compared with the one of the present invention showing 60 ° C. after 90 minutes,
The conventional incandescent lamp for comparison only raised the temperature by 45 ° C.

Example 2 In this example, the far infrared heater lamps (No. 1 and No. 2) of the present invention were manufactured under the same manufacturing conditions as in Example 1 using the ceramic fine powder having the components shown in Table 1 below. For comparison, conventional far infrared heater lamps (No.3 to No.5) were manufactured.

The surface temperature of each heater lamp is 800 ℃.
The heat shock test was conducted by repeating the heat cycle of lighting the lamp until the temperature reached, the temperature was raised, and immediately followed by water cooling. As a result, in the heater lamp of the present invention, even if the heat cycle is performed 20 times, the far-infrared radiation composition film does not have cracks, peeling, or abnormalities of whitening of the film, whereas in Comparative Examples, cracking, peeling, or the like, Discoloration of the film occurred. Further, the far-infrared radiation composition film of the present invention had a pencil hardness of 9H or more and was hard to be worn, but in the comparative example, the pencil hardness was small and easily worn.

Furthermore, for each of the above-mentioned lamps, lighting (ON) for 10 minutes-
A blinking test of 10 minutes of turning off (OFF) was conducted up to the lamp life, but no abnormality such as film cracking or peeling occurred in the heater lamp of the present invention.

FIG. 2 shows the spectral emissivity curve of the far infrared heater lamp of the present invention according to Example 1. As shown in FIG.
This heater lamp has a range of 2-30μ, especially 2.5-20μ
Uniform and good radiation is obtained in the far infrared region of.

As described above, the far-infrared heater lamp of the present invention has 70% by weight or more of silicon dioxide, aluminum oxide, and aluminum oxide 3 when converted into phosphorus pentoxide when the total weight is 100% by weight. Since a far-infrared radiation composition film composed of phosphorous oxide in an amount up to 5 times is provided on the surface of the enclosure of an incandescent lamp made of quartz glass, cracks, peeling, etc. of the film may occur until the lamp life. It has a remarkable effect that far infrared rays can be radiated with high efficiency.

[Brief description of drawings]

FIG. 1 is a graph showing the results of a water heating test using the lamp of the present invention and a conventional lamp, and FIG. 2 is a graph showing the spectral emissivity curve of the lamp of the present invention.

Claims (1)

[Claims] 1. When the total weight is 100% by weight, 70% by weight
A far-infrared radiation composition film composed of the above silicon dioxide, aluminum oxide, and phosphorus oxide in an amount that is 3 to 5 times that of aluminum oxide when converted into phosphorus pentoxide is used in an incandescent lamp made of quartz glass. A far infrared heater lamp characterized by being provided on the surface of the envelope.