JPS5890146A - Optical cycle tester for dew condensation - Google Patents

Abstract

PURPOSE:To perform a test under a high-precise condition, by a method wherein an electronic cooling element for heating or cooling a sample through a heat- transferring bottom plate of a test bath is located under the bottom plate, another electronic cooling element is situated to the side of the bath, and an ultraviolet lamps are positioned on the ceiling surface of the test bath. CONSTITUTION:If, in case an electronic cooling element 4 under a bottom plate 2 is cooled, air humidified by an ultrasonic system is fed to a test bath 1, dew is formed on a surface of a sample 3. The electronic cooling element 4 is then switched to heating, the humidified air is shut off, and an ultraviolet fluorescent lamp 7 is lighted. A cooling and a heating of the sample 3 can be freely regulated at a range of -10-+60 deg.C, and the temperature of the test bath 1 can be adjusted to a range of +10-+60 deg.C by cooling and heating an electronic cooling element 6 at a side. Finally, under a condition under which dew is formed on the surface of the sample 3, dew formation and ultraviolet irradiation can also be performed simultaneously.

Description

Detailed Description of the Invention The present invention aims to examine the durability of industrial materials such as paint films, synthetic resins, metal surfaces, and surface treatment agents against light, heat, low temperature, dew condensation, or complex conditions caused by combinations thereof. The present invention relates to a cycle testing machine.

In a conventional composite testing machine, such as a due-cycle accelerated weathering test machine, there is a rotating sample frame around a carbon arc lamp, and when the arc lamp is turned off, a 6 to 7 When the cooling spray at ℃ is injected, the humidity in the test chamber becomes 98 degrees or higher, and dew condenses on the surface of the test piece to cool the test piece.

Next, when turning on the arc lamp, stopping the cooling spray, and spraying the surface of the test piece intermittently, the humidity in the test chamber should be 40~
The temperature is adjusted by exhausting the air inside the tank and introducing some outside air. In this way, in the due-cycle test, dew condensation on the surface of the test piece when the lights are off corresponds to natural conditions at night, and UV irradiation, rain, and dryness correspond to natural conditions during the day, which are periodically repeated. .

In order to set this due-cycle condition, the electric power consumed by the arc lamp and the refrigerator for cooling water is large, and the equipment inevitably becomes extremely large, and switching is not quick.
However, the accuracy of the condition setting is poor (or not. Also, it is not possible to perform dew condensation and UV irradiation at the same time.

In another example of a conventional cycle testing machine, a test piece is placed on one side of the test tank, and a heating medium and a coolant are alternately flowed into the hollow outside of the heat transfer body wall, which is in contact with the back side of the test piece. Moreover, if high-humidity air is sent into the test chamber during the refrigerant flow period, dew condenses on the surface of the test piece. Next, the refrigerant and high-humidity air are stopped, and the heating medium is passed through to dry the surface of the test piece. Even in a cycle tester having such a configuration, the structure is extremely large in order to create and flow the heating medium and the refrigerant, and switching is not quick and accurate.

In addition, many complex test methods have been developed, including light irradiation,
Depending on the individual test conditions such as dew condensation and cooling, separate test chambers are provided for separate devices or even for one device, and each individual test is conducted in a complex manner. Therefore, it is necessary to prepare a test device for each test condition, and the test conditions for which one test tank can be used in combination are very limited.

The inventor has solved the above-described shortcomings of the conventional cycle testing machine, and has developed a system that can perform multiple types of individual tests and periodic cycle tests by appropriately combining them in one test chamber, and that the testing machine is as small as possible. We have made repeated studies to improve the accuracy of each test condition.First, we have made it more compact by using an electronic cooling element to heat and cool the test piece and to adjust the temperature of the test chamber. As an ultraviolet light source, an ultraviolet lamp is suitable for this purpose, and for humidification, ultrasonic vibrators are used to turn water into fine particles. By doing this, we were able to complete a cycle testing machine that is small, consumes little power, has high accuracy, and has quick switching times using a single test chamber.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan partial sectional view of a cycle testing machine according to the present invention, and FIG. 2 is a side sectional view thereof.

The bottom plate 2 of the test chamber 1 is made of a heat transfer material, and the test piece 3 is placed on it. There is an electronic cooling element 4 in contact with the lower surface of the bottom plate.

A radiator 5 is provided on one side of the test chamber, and an electronic cooling element 6 is provided connected to the back of this radiator. Ten ultraviolet fluorescent lamps T are installed on the ceiling of the test chamber.

There is a humidifier 8 outside the test chamber, which sends high-humidity air into the test chamber. A humidifier humidifies water by sending water particles generated by applying an ultrasonic vibrator to water into a test chamber. A fan 9 is provided to uniformly adjust the temperature and humidity inside the tank. FIG. 3 is an explanatory diagram of the electronic cooling element 4.6. As shown in the figure, it has a structure in which a copper plate 10 and a semiconductor 11 are connected in series, and for plate A of plates A and B, when current is passed in a constant force direction in the conductor 12, it is cooled, and when it is passed in the opposite direction. Be heated. At the same time, the opposite phenomenon occurs in B.

Next, the functions and functions of the configuration of the present invention will be explained. 1.2
In the figure, when cooling the electronic cooling element 4 at the bottom of the bottom plate,
When humidified air is sent into the test chamber using an ultrasonic method, dew condenses on the surface of the test piece. Next, the electronic cooling element 4 can be switched to heating, the humidified air can be stopped, and the ultraviolet fluorescent lamp can be turned on. The cooling and heating of the test piece can be freely adjusted within the range of -10 to 160°C. Further, during each test condition period, the temperature inside the test chamber can be freely adjusted within the range of +10 to +60° C. by appropriately heating and cooling the electronic cooling element 6 on the side surface. Or under conditions where dew condensation occurs on the surface of the test piece,
By lighting an ultraviolet fluorescent lamp, dew condensation and ultraviolet irradiation can be performed simultaneously.

The configuration and functions of the present invention have been explained above, and next, the effects of implementing the present invention will be explained.

By using an electronic cooling element to heat and cool the bottom plate of the test chamber and to adjust the temperature of the test chamber, the volume of the entire test machine has become much smaller than in conventional systems. Switching between heating and cooling is simple and fast by changing the direction of the current, and heating and cooling are highly reliable and accurate (and the mechanism has a long lifespan. The power consumption is low, about 1/10 of the conventional one-heater type on the same scale.By using an ultraviolet lamp, ultraviolet rays of 300 to 400 mμ can be obtained, and the energy irradiated to the test piece surface is uniform, reducing the power consumption. The electricity is low and the equipment cost is low.Furthermore, by performing ultraviolet irradiation, humidity generation, and heating and cooling methods as in the present invention, each test of dew condensation, ultraviolet irradiation, drying, cooling, and high humidity can be conducted individually in one test chamber. It is also possible to perform a composite test by combining each of these conditions as a cycle test, and it is also possible to perform dew condensation and ultraviolet irradiation at the same time, which is impossible with conventional due-cycle accelerated weathering tests. The functional characteristics of the testing machine according to the present invention are as described above,
Another major effect of the present invention is that it is very economical to miniaturize the device and to be able to perform cycle tests in one test tank.

[Brief explanation of drawings]

Figure 1 is Ki-ni F! AK is a plan partial cross-sectional view of a Seikle tester, FIG. 2 is a side cross-sectional view thereof, and FIG. 3 is an explanatory diagram of a thermoelectric cooling element. DESCRIPTION OF SYMBOLS 1...Test tank, 2...Test tank bottom plate, 3...Test piece, 4.6...Electronic cooling element, 5...Radiator, 1...
・Ultraviolet fluorescent lamp, 8... Humidifier, 9... Fan, 10... Copper plate, 11... Semiconductor, 12... Conductive wire, 13... Control unit, A, B... Heating and cooling plate. Valve 1 Figure 2 Figure 3

Claims (1)

[Claims] There is an electronic cooling element under the heat conductive bottom plate of the test chamber for heating or cooling the test piece through the heat conductive bottom plate, and an electronic cooling element on the chewing side of the test chamber for adjusting the temperature inside the chamber. 1. A lightless cycle tester characterized in that the test chamber has an ultraviolet lamp on the ceiling surface of the test tank.