JP3318910B2 - Vertical metal halide lamp type weathering tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp house of a weathering tester using an air-cooled vertical long arc metal halide lamp as a light source.

[0002]

2. Description of the Related Art As a light source of a weather resistance tester for testing weather resistance and light resistance of materials, ultraviolet light arc lamps, sunshine carbon arc lamps, and xenon arc lamps are specified by ISO and JIS standards. .

[0003] When weather resistance and light resistance are tested using a test device using a light source specified in the standard, the correlation between the results of exposure tests outdoors and indoors is required to evaluate the life and durability of the material. It is valued. Therefore, in order to reproduce the simulated sunlight with the test equipment, various types of glass filters are combined so that the spectral distribution specific to each light source approximates the spectral distribution of sunlight. For example, in the case of a test of an exterior material, a cut of 275 nm or less is used, and in the case of a test of an interior material, a cut of 295 nm or less is used so as to reproduce the rising characteristics of the material.

[0004] In recent years, demands for improved weather resistance and light resistance of materials and a reduction in test time have led to a demand for more accelerated test equipment, and the ultraviolet carbon arc lamp and sunshine carbon described above have been demanded. Compared with arc lamps and xenon arc lamps, metal halide lamps with mercury and metal halides, which have more than 30 times more powerful ultraviolet radiation energy in the ultraviolet from 300 nm to 400 nm, have been attracting attention, and the quality of the materials has been shortened in a short time. Just starting to be used as a screening test to evaluate only badness, the weather resistance and
Correlation data with outdoor and indoor exposure test results have been actively collected for use as light sources for light resistance tests.

[0005] metal halide lamp type weathering light test apparatus, a lamp rated for source 2k W, 4k W, at 6k W, the light emitting portion is water-cooled metal halide lamp of straight tube diameter is small in the long arc is used, the Level the lamp,
As in the case of the xenon arc lamp for a weathering tester, the lamp is cooled with water and the lamp has a double tube structure that surrounds the lamp with an inner filter and an outer filter. Weather light test equipment is commonly used.

In the case of a long-arc metal halide lamp, mercury and a metal halide are sealed in the lamp tube. If the lamp is turned on vertically and the vertical distance between the electrodes is increased, the lamp is sealed due to gravity. The collected metal collects near the lower part in the lamp tube, causing non-uniform convection between the electrodes in the lamp tube, making it impossible to emit light uniformly in the entire light emitting portion. Therefore, the lamp rated 2k W,
4k W, when the straight tube type water-cooled metal halide lamp, such as between the electrodes exceeds the 20cm in 6k W, used in the always horizontal to the lamp.

[0007] The applicant has filed utility model registration No. 305562.
No. 0 discloses an air-cooled vertical metal halide lamp that can be used as a vertical lamp in a weathering test apparatus and a weathering tester using the lamp.

In the case of a weather resistance / light resistance tester, as described above, it is assumed that the spectral distribution of the light source is approximated to that of sunlight, so that a glass filter for adjusting the spectral distribution is necessarily required. For this reason, in the case of the air-cooled vertical metal halide lamp as well, a lamp house having a double tube structure as shown in FIG. 2 in which the lamp is double surrounded by an inner filter and an outer filter has to be used.

[0009]

Lights with lamp house structure showing air-cooled vertical long arc metal halide lamp of the lamp rated 2k W or 3k W [0005] In FIG. 2, was tested, out defective lamp Did not have the life of the lamp.

When a lamp having no lamp life was examined, the molybdenum thin film serving as a conductor between the electrode and the lead wire in the lower lamp sealing portion of the lamp was melted and cut off. Alternatively, the vicinity of the lower electrode of the lamp was abnormally discolored (blackened), and in some cases, the glass was about to be damaged. In this way, the cause was concentrated on the lower side of the lamp.

Therefore, the temperature was measured at the inlet of the lamp house, the upper lamp sealing portion, the lower lamp sealing portion, etc. of the lamp house in FIG. Table 1 shows a part of the measurement results.

[0012]

[Table 1]

From Table 1, it was found that a large temperature difference exceeding 100 ° C. occurred between the temperature of the upper lamp sealing portion and the temperature of the lower lamp sealing portion. It is considered that this temperature difference is caused by the fact that the air warmed in the upper lamp sealing portion is further heated at the emission temperature of the light emitting portion while passing through the light emitting portion of the lamp, and reaches the lower lamp sealing portion. .

[0014] The amount of cooling air from the blower was increased.
Although the overall temperature drop at each measurement point was observed,
The temperature difference between the upper lamp sealing portion and the lower lamp sealing portion was not eliminated.

When a large temperature difference is generated between the upper and lower portions of the lamp as shown in Table 1, the convection in the light emitting portion of the lamp is deteriorated, the temperature distribution in the light emitting portion varies, and the halogen sealed in the lower electrode. This may cause the adhesion of metal oxides.

Variations in the temperature distribution in the light emitting portion lead to variations in the immediate light distribution curve, in other words, uneven light emission.
Variations in light emission cause variations in test results due to vertical movement of the test piece and variations in test results depending on the position where the test piece is placed, thereby lowering the test accuracy of the apparatus itself.
Also, the adhesion of the encapsulated metal halide to the lower electrode not only deteriorates the electrode itself and shortens the lamp life, but also increases the heat generation of the electrode and applies a load to the glass near the electrode. However, the glass itself may be damaged.

Looking at the temperature of the lower lamp sealing portion in Table 1, it shows a value exceeding 330 ° C. In the lower lamp sealing portion, a molybdenum thin film serving as a conductive member between an electrode in the lamp tube and a lead wire connected to a lighting device provided outside the test tank is sealed with glass. This molybdenum thin film is designed to withstand temperatures up to about 350 ° C., but there is a deep relationship between the temperature near the electrodes and the lead wires and the life of the lamp. When the temperature is high, the life of the lamp becomes extremely short. For this reason, the temperature of the lower lamp sealing portion needs to be 250 ° C. or less. Since the temperatures shown in Table 1 are close to the limit temperature that the molybdenum thin film can withstand, it is estimated that the life of the lamp was extremely shortened.

According to the present invention, an air-cooled vertical long arc metal halide lamp used in a weathering tester is provided with an upper lamp sealing portion and a lower lamp sealing portion so as to extend the life of the lamp and eliminate defects of the lamp. It is an object of the present invention to provide a lamp house having a mechanism for reducing a temperature difference.

[0019]

According to the present invention, there is provided an air-cooled vertical long arc metal halide lamp having an inner ring portion of a lower mounting bracket of a lamp house.
In other words, between the lower lamp sealing portion and the inner filter, a local cooling for adjusting the air volume from a blower or an air pump disposed outside the tank and blowing the blown cooling air to the lower lamp sealing portion. Equipment was installed.

It is preferable that the local cooling device is mounted at a position where the cooling air hits the center of the lower lamp sealing portion.

If a local cooling device is mounted on the upper part of the lower lamp sealing part, it may affect the temperature distribution of the light emitting part of the lamp, resulting in non-uniform light emission. When the local cooling device is attached to the lower part of the lower lamp sealing part, the difference between the temperature of the upper lamp sealing part and the temperature of the lower lamp sealing part, which is the object of the present invention, is only to cool the bottom of the lower mounting bracket. The effect of reducing is not obtained.

A blower for blowing cooling air between a lamp and an inner filter provided on a ceiling of the test tank;
It is preferable that the air volume of a blower or an air pump arranged outside the tank for sending cooling air to the local cooling device can be arbitrarily adjusted.

In the case of the air-cooled type, since the outside air is drawn in and cooled, changes in the outside air temperature and the air volume greatly affect the cooling capacity. Therefore, in order to maintain the temperature difference between summer and winter, and to maintain appropriate temperatures of the upper lamp sealing portion and the lower lamp sealing portion, it is preferable to add an air volume adjusting device that can arbitrarily adjust the air volume.

In the case of an air-cooled type, dust and dust floating in the air are sucked in, contaminating the lamp and the glass filter and affecting the test. Therefore, it is necessary to attach an air purifying filter to the blower and the air pump. There is.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 3 is a longitudinal sectional view of a main part of the first embodiment of the present invention, in which an air-cooled vertical long arc metal halide lamp (1) is used as a light source, and the lamp is concentrically surrounded by a circle larger than the circumference of the light emitting unit diameter of the lamp. A cylindrical filter (2a) having a diameter of 60 mm, which is called an inner filter, is disposed, and an air flow path (A) is provided between the air-cooled vertical long arc metal halide lamp (1) and the cylindrical filter (2a). ) Space is secured.

Further, outside the cylindrical filter (2a), a cylindrical filter (2b) having a diameter of 100 mm called an outer filter and surrounding the filter larger than the circumference of the filter diameter is disposed. A space for the air flow path (B) is secured between the air filter and the cylindrical filter (2b).

The upper end of the air-cooled vertical long arc metal halide lamp (1), the cylindrical filter (2a) and the cylindrical filter (2b) is formed by an upper fitting (3).
The lower end is sandwiched and overlapped by a lower mounting bracket (4) and fixed by an upper fixing ring (5) and a lower fixing ring (6). The upper mounting bracket (3) extends vertically upward from the center of the ceiling of the test tank. , The cylindrical filter (2
a) a metal cylinder (7a) having the same diameter as that of the cylindrical filter (2b) and the lower end of a metal cylinder (7b) having the same diameter as the cylindrical filter (2b); At the upper end of (7a), a blower (8) for sucking outside air is provided.

The air sucked from the blower (8) and adjusted to an arbitrary air volume passes through the inside of the cylinder (7a) and passes through the air-cooled vertical long arc metal halide lamp (1) and the cylindrical filter (2a). After passing through the air flow path (A) between them and reaching the lower mounting bracket (4), the cylindrical filter (2a)
The air passes through the air flow path (B) between the cylinder and the cylindrical filter (2b) upward, passes through the space between the cylinder (7a) and the cylinder (7b), and is exhausted outside the tank.

At the position of the center of the lower lamp sealing part (21), it penetrates the side wall of the lower mounting bracket (4), and extends vertically beyond the inner ring of the lower mounting bracket (4). A metal air nozzle that spread horizontally in a ring shape at the center of the lamp sealing portion (21) was provided. In the case of the present invention,
Stainless steel was used for the metal of the air nozzle.

The ring-shaped portion of the air nozzle surrounds the lower lamp sealing portion (21), and a plurality of holes are provided on the lower lamp sealing portion side of the ring. FIG. 4 is a perspective view of the air nozzle according to the first embodiment of the present invention.

The air nozzle is connected to an air pump (10) and a flow meter (13) provided outside the tank by a heat-resistant Teflon (registered trademark) tube.

In the first embodiment shown in FIG. 3, the blower (8)
The air flow from the air nozzle was adjusted to 2100 l / min, the air flow from the air nozzle was adjusted to 50 l / min, and the temperature of the upper lamp sealing part and the temperature of the lower lamp sealing part were measured. The temperature difference between the temperature of the lamp sealing portion and the temperature of the lower lamp sealing portion was reduced.

[0033]

[Table 2]

FIG. 5 is a longitudinal sectional view of a main part of a second embodiment of the present invention. In this embodiment, a local cooling device for a lower lamp sealing portion is replaced with an air nozzle system shown in FIG. It is of the blower duct type that is used.

A blower (11) is provided outside the tank, and the outlet of the blower (11) is joined to the upper end of the duct. The mouth of the duct is narrowed while extending into the test tank. The distal end of the duct penetrates through an air vent provided on the side wall of the lower mounting bracket (4), communicates with the inner ring wall of the lower mounting bracket (4), is sent from the blower (11), and has a regulated air volume. The air passes through the duct and hits the inner ring wall of the lower mounting bracket (4) to locally cool the lower lamp sealing portion (21) of the air-cooled vertical long arc metal halide lamp (1). .

[0036]

The present invention has the following effects. Conventionally, a local cooling device that cools the central part of the air nozzle type or air duct type lower lamp sealing part is arranged in the lower mounting bracket part of the lamp house of the air-cooled vertical arc metal halide lamp. The difference between the temperature of the sealing portion and the temperature of the lower lamp sealing portion is 100 ° C.
As shown in Table 2, the above was able to be suppressed to about 5 ° C. or less.

Furthermore, 2k W, for molybdenum thin film on the lamp sealing portion of 3k W air-cooled vertical long arc metal halide lamps, also becomes possible to 250 ° C. temperature below a proper temperature, the molybdenum thin film due to heat Of the lamp, that is, the possibility of disconnection, can be avoided, and the life of the lamp can be extended.

Since the difference between the temperature of the upper lamp sealing portion and the temperature of the lower lamp sealing portion can be reduced, the temperature distribution in the lamp light emitting portion is not concentrated on the lower portion of the lamp, and the lamp is damaged at the lower portion of the lamp. You can now avoid it.

[Brief description of the drawings]

FIG. 1 is a conventional metal halide lamp type weather resistance tester.

FIG. 2 is a lamp house of a conventional air-cooled vertical long arc metal halide lamp type weathering tester.

FIG. 3 is a longitudinal sectional view of a main part of a lamp house of an air-cooled vertical long arc metal halide lamp type weathering tester showing the first embodiment of the present invention.

FIG. 4 is a perspective view of an air nozzle according to the first embodiment of the present invention.

FIG. 5 is a vertical sectional view of a main part of a lamp house of an air-cooled vertical arc metal halide lamp type weathering tester showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-cooled vertical long arc metal halide lamp 2a, 2b Cylindrical filter 3 Upper mounting bracket 4 Lower mounting bracket 5 Upper fixing ring 6 Lower fixing ring 7a, 7b Cylinder 8, 11 Blower 10 Air pump 13 Flowmeter 20 Upper lamp sealing Part 21 Lower lamp sealing part 30 Cooling device A, B Air flow path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 17/00 JICST file (JOIS)

Claims (3)

(57) [Claims] 1. A weathering tester in which a light source is vertically arranged at the center of a test tank, wherein: a) an air-cooled vertical long-arc metal halide lamp (1) is used as the light source; and b) the air-cooled vertical long lamp. A cylindrical filter (2a) is arranged concentrically with the arc metal halide lamp (1) and has a circumference larger than the circumference of the light emitting portion of the lamp, and the air-cooled vertical long arc metal halide lamp (1) and the cylindrical filter are arranged. And (2a) a space for the air flow path (A) is secured. C) A cylindrical filter (2b) surrounding the outer circumference of the cylindrical filter (2a) so as to be larger than the circumference of the filter aperture.
And a space for an air flow path (B) is secured between the cylindrical filter (2a) and the cylindrical filter (2b). D) The air-cooled vertical long arc metal halide lamp (1) , The cylindrical filter (2a) and the cylindrical filter (2b) are overlapped by sandwiching the upper end thereof with the upper mounting bracket (3) and the lower end thereof with the lower mounting bracket (4). E) The upper mounting bracket (3) portion has a diameter of the same circumference as the cylindrical filter (2a) extending vertically upward from the center of the test tank ceiling and opening outside the tank. The lower end of a metal cylinder (7b) having the same diameter as the metal cylinder (7a) and the cylindrical filter (2b) is fitted. F) The upper end of the cylinder (7a) A blower (8) for sucking outside air is provided; g) the blower The air sucked from 8) and adjusted to an arbitrary air volume passes through the inside of the cylinder (7a) and flows between the air-cooled vertical long arc metal halide lamp (1) and the cylindrical filter (2a). After passing through the flow path (A) and reaching the lower mounting bracket (4), the air flow path (B) between the cylindrical filter (2a) and the cylindrical filter (2b) travels upward. The gas is exhausted to the outside of the tank through the space between the cylinder (7a) and the cylinder (7b). H) Further, the lower mounting bracket (4) is provided with an air pump (10) or The lower lamp sealing portion (2) of the air-cooled vertical long arc metal halide lamp is supplied with air adjusted to an arbitrary flow rate from the blower (11).
1) A cooling device (30) for performing local cooling of a portion is provided, and i) an air pump fed to the cooling device (30) and a flow rate from a blower (8) disposed at an upper end of the cylinder (7a). (10) or the balance of the air volume from the blower (11) is adjusted, so that the temperature difference between the temperature of the upper lamp sealing part (20) and the temperature of the lower lamp sealing part (21) is small and almost uniform. J) the air discharged from the cooling device (30) strikes the lower lamp sealing portion (21), and then flows between the cylindrical filter (2a) and the cylindrical filter (2b). Characterized by a lamp house having a configuration in which the lamp house is configured to proceed upward through the air flow path (B), pass between the cylinder (7a) and the cylinder (7b), and be exhausted to the outside of the tank. Lamp type weather resistance tester. 2. In the cooling device, a metal pipe penetrates horizontally from outside the outer peripheral side wall of the lower mounting bracket, extends in the direction of the center of the mounting bracket, and enters the inner ring of the lower mounting bracket. From the vicinity, it rises in the vertical direction, and at a position on the horizontal line at the center of the lower lamp sealing portion of the air-cooled vertical long arc metal halide lamp, it spreads around the lower lamp sealing portion and forms a ring shape. On the lower lamp sealing portion side, a cooling air nozzle provided with a plurality of air exhaust holes, the flow rate of compressed air from an air pump disposed outside the tank is adjusted by a flow meter, and the cooling air nozzle 2. The vertical metal halide lamp type weathering tester according to claim 1, wherein the lower lamp sealing portion is locally cooled. 3. The cooling device is provided with a blower outside the tank,
The outlet of the blower is joined to the upper end of the duct, and the mouth of the duct is narrowed narrowly while extending into the test tank, and the tip of the duct extends from the air outlet provided on the side wall of the lower mounting bracket. The air that has penetrated, communicates with the inner ring wall of the lower mounting bracket, is sent from the blower, and the air volume of which has been adjusted passes through the duct and hits the inner ring wall of the lower mounting bracket, and is an air-cooled vertical long arc metal halide lamp. 2. The vertical metal halide lamp type weathering tester according to claim 1, wherein the lower lamp sealing portion is locally cooled.