JP2709598B2 - Environmental test equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial Application Field) The present invention relates to an environmental test apparatus, and more particularly, to an environment in which a plurality of simulated sunlight sources are provided to increase the irradiation intensity on a sample. It relates to a test device.

(Prior Art) A simulated sunlight light source using a xenon short arc lamp, a xenon long arc lamp, a carbon arc lamp, etc. (hereinafter simply referred to as an arc lamp) as a light source device capable of reproducing the spectral distribution of natural sunlight with high accuracy. Devices are known. Such a simulated solar light source device is used by being incorporated in an environmental test device for a light resistance and weather resistance accelerated deterioration test of fibers, dyes, paints, pigments, and the like.

Among the above lamps, the xenon short arc lamp in particular has a spectral distribution very similar to that of natural sunlight, and the results of an environmental test using the lamp as a simulated solar light source and the results of an outdoor exposure test are as follows. High correlation. For this reason, a xenon short arc lamp is often used for the environmental test apparatus.

Usually, the light- and weather-resistance accelerated deterioration test is performed as follows. FIG. 5 shows an example of the above environmental test apparatus.

In the figure, a turntable 3 is provided so as to be rotatable about a shaft 2 provided on an extension of a long axis 5b of an arc lamp 5. A test material 4 is placed on the rotary table 3 via a positioning block 3a at a predetermined distance from the arc lamp 5 so that the test surface 4a faces the arc lamp 5.

Then, if necessary, for example, air humidified by a humidifier is supplied to a test material mounting position to perform a test under humidification conditions, or water cooled by a cooler is supplied to the test material 4. The test material 4 is cooled by spraying on the back surface of the sample, and a test is performed by forming a dew condensation state on the test surface.

In the environmental test apparatus having the above configuration, the test material 4 is rotated in the direction of the arrow 2a by the turntable 3 so that the light from the arc lamp 5 is evenly applied to the test surface of the test material 4.

(Problems to be Solved by the Invention) The above-described conventional technology has the following problems.

That is, the dye or fiber used as a test material in the light resistance / weather resistance accelerated deterioration test is mainly used indoors when it is a final product. Therefore, these dyes or fibers can be subjected to a sufficiently efficient light- and weather-resistant accelerated deterioration test under the irradiation intensity obtained by a conventional light source (about three times the irradiation intensity of standard sunlight). Was.

However, in the case where the test material 4 is a paint or a pigment and the final product using the same is used outdoors (for example, a paint for automobiles), the light resistance and weather resistance of the test material are low. The irradiation intensity obtained with a conventional light source was so insufficient that it was insufficient to efficiently conduct a test until the test material deteriorated.

That is, the accelerated deterioration test of light resistance and weather resistance of a paint or a pigment, which is often used outdoors for the final product, requires a longer time than the test for the dye or fiber.

In order to increase the irradiation intensity, the discharge (consumption) power of the arc lamp should be increased, but in consideration of the heat resistance of the arc lamp, about 8 kilowatts is required for the air-cooled type.
In a water-cooled system, the limit is about 12 kilowatts, and the irradiation intensity obtained with this level of power is insufficient for testing the paint or pigment.

It is conceivable to use a plurality of arc lamps in order to increase the irradiation intensity. However, as shown in FIG. 5, in the light- and weather-resistant accelerated deterioration test, the arc lamp 5 is disposed at the center of the test material 4. Therefore, in order to use a plurality of arc lamps, the plurality of arc lamps are concentrated and arranged at the center.

Therefore, each of the plurality of arc lamps is affected by the heat of the adjacent arc lamp, and there is a risk that the service life of the arc lamp may be shortened particularly due to overheating of the electrode sealing portion.

As a result, in order to use a plurality of arc lamps in a concentrated manner, the discharge power of each arc lamp needs to be smaller than before, and despite the use of multiple arc lamps, the irradiation intensity is greatly increased. There was a problem that it was not possible.

Furthermore, in order to increase the irradiation intensity, as the discharge power of the arc lamp is increased, more infrared light is emitted together with visible light and ultraviolet light, and accelerated light and weather resistance deterioration tests that do not require much thermal action by infrared light There was also a problem that it was not suitable for.

The present invention has been made to solve the above problems.

(Means and Actions for Solving the Problems) In order to solve the above problems, the present invention relates to an environmental test apparatus using a plurality of arc lamps as a simulated solar light source. It is characterized in that a filter for absorbing infrared rays and allowing others to pass therethrough is provided between them.

According to the present invention having the above configuration, the filter provided between the arc lamps absorbs the infrared light emitted from each arc lamp in the direction of the adjacent arc lamp. As a result, each of the arc lamps is less affected by the thermal effect of the infrared radiation radiated from the adjacent arc lamp, so that overheating of the arc lamp due to the thermal action of the infrared radiation can be avoided.

Also, since light in the infrared region is removed from the light radiated behind each arc lamp, only infrared rays radiated from the front of each arc lamp are included in the test material disposed around the arc lamp. Irradiation is performed, and the test material is not excessively irradiated with infrared rays. In addition, since other visible light and ultraviolet light are not absorbed by the filter, the test material can be irradiated with a plurality of arc lamps at a higher intensity than before, and a sufficient accelerating effect can be obtained in an environmental test.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing the structure of one embodiment of the present invention, and FIG. 2 is a sectional view of the same.

1 and 2, the same reference numerals as those in FIG. 5 indicate the same or equivalent parts. In the figure, the light source device 1 is suspended from above by a support member (not shown) at the center of the turntable 3. The light source device 1 includes two xenon short arc lamps 5, a water filter 6 disposed between the arc lamps 5, and a cylindrical filter 7 surrounding the arc lamp 5 and the water filter 6. doing.

A voltage is applied to both ends of the arc lamp 5 from a lighting circuit (not shown), an arc is generated between the electrodes in the arc lamp 5, and light is emitted.

The water filter 6 includes the two arc lamps 5,
It is provided so as not to be affected by heat from the arc lamps adjacent to each other. Therefore, a liquid is circulated inside the water filter 6 to form a liquid layer that absorbs infrared rays emitted from the arc lamp 5.

As the liquid circulating inside the water filter 6, water or an aqueous solution of copper sulfate is used. When a liquid layer is formed by water, a water layer of 60 mm or more must be formed in order to absorb infrared rays emitted from the arc lamp 5. On the other hand, in the case of a copper sulfate aqueous solution, if a 5% copper sulfate aqueous solution is used, for example, the thickness of the aqueous solution layer is reduced.
In the case of 10 mm, the wavelength of 700 nm or more can be absorbed (5% copper sulfate aqueous solution). In the case of the thickness of the aqueous layer of 15 mm, the wavelength of 640 nm or more can be absorbed. Can absorb infrared rays.

Thus, the wavelength that can be absorbed can be adjusted by selecting the concentration of the aqueous solution or the thickness of the layer. The water filter 6 is provided therein with a water inlet 6a and a water outlet 6b for circulating the water or the aqueous solution.

The filter 7 is provided for adjusting the spectrum of the arc light according to the test conditions for the test material 4 and for protecting the arc lamp. From above the cylindrical filter 7, air for cooling the arc lamp is fed into the filter 7 from an arc lamp cooling blower (not shown) to suppress an increase in the temperature of the arc lamp.
Needless to say, the water filter 6 is simultaneously cooled by the cooling air.

The water filter 6 and the cylindrical filter 7 are both made of heat-resistant glass, for example, borosilicate glass.

In the present embodiment having the above-described configuration, the water filter 6 that absorbs infrared rays is provided between the two arc lamps 5, so that infrared rays emitted from one arc lamp 5 to the other arc lamp are absorbed. Therefore, the heat effect of infrared rays emitted from one of the arc lamps 5 is not received by the other arc lamp.

As a result, as shown in FIG. 1 and FIG. 2, even if a plurality of arc lamps are provided in the center of the turntable 3 so that the major axes of the lamps are parallel to each other, the arc lamp 5 can be used. It does not overheat and shorten its life.

In the above embodiment, an example was described in which two arc lamps were provided, but the number of arc lamps can be increased to further increase the irradiation intensity. Fig. 3 shows the arc lamp 5
Here, an example in the case where the number of is three is shown. 2, the same reference numerals as those in FIG. 1 denote the same or equivalent parts, and a description thereof will be omitted.

In the above embodiment, the water filter 6 has a curved surface that absorbs infrared rays radiated from about half the circumference of the arc lamp 5 (the cross-sectional shape orthogonal to the arc lamp tube axis is:
It has a shape with a constricted drum shape at the center. However, the water filter 6 is not limited to this shape, and may be formed in a flat plate shape. By making the water filter 6 flat, the range in which infrared rays are absorbed is reduced, and the test material 4 is irradiated with a large amount of infrared rays correspondingly.

FIG. 4 shows a comparison of the infrared absorption range. In the figure, a region A surrounded by a broken line is a range where infrared rays are absorbed. As shown in the figure, a water filter having a curved surface portion has a wider infrared absorption range than a flat water filter. Thus, the water filter 5 not only suppresses the temperature rise of the arc lamps 5 provided adjacent to each other, but also limits the irradiation amount of infrared rays to the test material 4. Then, by selecting the shape of the water filter 6, the irradiation amount of infrared rays to the test material 4 can be adjusted.

According to this embodiment, as described above, the plurality of arc lamps are isolated by the water filter that absorbs infrared light, so that the thermal effects of infrared light emitted from the plurality of arc lamps are mutually different. It is possible to avoid extending to an adjacent arc lamp.

Further, since infrared rays are absorbed by the water filter, a large amount of infrared rays radiated from a plurality of arc lamps and irradiated to the test material can be limited to a predetermined amount according to the test conditions.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects are achieved.

(1) Since a plurality of arc lamps can be arranged intensively, the irradiation intensity on the test material can be increased. As a result, it has become possible to provide an environmental test apparatus that can cope with a test that requires a large irradiation intensity, such as an accelerated deterioration test of light resistance and weather resistance of paints and pigments.

(2) An extraneous infrared ray unnecessary for the test can be removed from infrared rays radiated from a plurality of arc lamps, so that an environmental test apparatus capable of increasing only the irradiation intensity of ultraviolet light and visible light can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing the structure of one embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a plan view showing another embodiment of the present invention, and FIG. FIG. 5 is a front view of a conventional technique. DESCRIPTION OF SYMBOLS 1 ... Simulated sunlight light source device, 2 ... Shaft, 3 ... Rotary table, 4 ... Test material, 5 ... Arc lamp, 6 ... Water filter, 7 ... Cylindrical filter

Claims (5)

(57) [Claims] 1. An environment test apparatus using a plurality of xenon short arc lamps provided adjacent to each other as a simulated sunlight light source, wherein said xenon short arc provided between said plurality of lamps and adjacent to each other. An environmental test apparatus comprising: a filter for absorbing infrared rays of light emitted from a lamp and passing the other. 2. The environmental test apparatus according to claim 1, wherein said filter is a glass container for circulating a liquid therein. 3. The environmental test apparatus according to claim 2, wherein the shape of the glass container is a drum shape with a narrow central portion in a cross section orthogonal to the axis of the xenon short arc lamp tube. 4. The environmental test apparatus according to claim 2, wherein said liquid is water. 5. The environmental test apparatus according to claim 2, wherein the liquid is an aqueous solution of copper sulfate.