JPS59132334A - Testing tank for salt water spraying testing machine - Google Patents

Abstract

PURPOSE:To make uniform heating possible, by providing tightly closed spaces between outer and inner walls made of synthetic resin in a testing tank and its lid, and laying electric heating wire covered by heat resisting electric insulating material in the space so that the wire by closely contacted with the inner wall surface. CONSTITUTION:A spraying tower 2 is provided at the center of a testing tank 1. A lid comprises an outer wall 13 and an inner wall 14 which form a tightly closed space. The main body of the testing tank comprises an outer wall 15 and an inner wall 16 which form a tightly closed space. The top end of the main body of the testing tank is a lid receiving part 17 forming a groove along the entire circumference of the tank. The groove is filled with a packing 18. The periphery of the lower end of the lid is coupled into the groove. Covered Nichrome wire 19 for electrical heating is laid in each tightly closed space so as to contact closely with each inner wall. Reflecting double layered plates 20 are provided on the outer wall side in each tightly closed space. The reflecting double layered plates 20 form a composite body, wherein, e.g., 10-20 sheets of Al foils having a thickness of 18mum are laminated with an interval of 0.1- 5mm. provided between the foils.

Description

DETAILED DESCRIPTION OF THE INVENTION A structure is maintained in which the temperature distribution on the surrounding wall of the fuel cell is made uniform so that the flow of the spray becomes uniform.

As shown in FIG. 1, a conventional salt water spray tester has a spray tower 2 in the center of a spray tower 1, and salt water is sprayed by a spray nozzle inside the spray tower. It is important to keep the temperature inside the spray test tank uniform, but the water 7 placed in the space between the inner and outer walls at the bottom of the test tank is heated by the heater 8 to fill the space 11 above the water surface. The inside of the test chamber is heated by water vapor through the inner wall 10. Since the lid 9 does not have a heating device, the temperature inside the test chamber is not only uneven, but also the test becomes invalid because dew condenses on the inner surface of the lid and drops fall onto the test piece 12 placed at the bottom of the test chamber. There are many cases. Moreover, if the insulation of the outer wall is not sufficient, the flow of water vapor in the space 11 will be crowded due to slight temperature changes in the outside world, and the inner wall 11 will be
temperature distribution deteriorates. In addition, in heating the inside of the test tank, as mentioned above, it is necessary to first heat the water T to a predetermined temperature, so the initial heating takes a long time.

As a result of studies, the inventor of the present invention has developed the present invention in order to overcome these drawbacks of conventional test machines. That is,
The test tank and its lid of the salt spray tester are composed of an inner wall and an outer wall made of synthetic resin that sandwich a closed space, and each closed space has two walls.
An electric heating plate covered with a heat-resistant electrically insulating material is tightly stretched around the inner wall surface of the valley, and a reflective multilayer plate is provided near the outer wall.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a sectional view of a salt water spray test tank and a lid according to the present invention. There is a spray tower 2 in the center of the tasting tank 1, the lid consists of an outer wall 13 and an inner wall 14 that sandwich a sealed space, and the test tank body consists of an outer wall 15 and an inner wall 16 that sandwich a sealed space. The upper end of the test chamber body has a lid holder part 17 which forms a groove all around the circumference, and this bamboo is filled with a packing 18 and the lower end peripheral edge of the lid is fitted therein. There is an exhaust port 21 in the center of the bottom of the test chamber, which is connected to an elbow 22 and serves to discharge the salt spray. In each sealed space of the test chamber and the test chamber, there is nichrome to be tested for electric heating in close contact with each inner wall. An IM 19 is arranged, and a reflective multilayer plate 20 is housed in each sealed space near the outer wall. In the middle part of the sample M tank, there is a sample frame 23 and an inner wall protrusion 24 for supporting the sample frame 23. Both the inner and outer walls in this embodiment are made of heat-resistant synthetic resin, such as FRP (glass fiber reinforced unsaturated polyester). At least the inner wall must be made of heat-resistant synthetic resin. The material for covering the electrical heating coated nichrome wire must be heat resistant, so silicone rubber or fluororesin is appropriate. FIG. 3 shows an embodiment in which a metal fitting 25 embedded in the inner wall 16 is made of silicone rubber-covered nichrome 19 and tightly fixed thereto. FIG. 4 is a cross-sectional view of the vicinity of the end of the wall of the test tank, and also shows a cross section of the nichrome edge for electric heating, and the nichrome +719' is covered with silicon comb 19''.The reflective multilayer plate 20 has a thickness of, for example, 10 to 20 pieces of 18μ aluminum foil with a spacing of 0.1 to 0.5 mm between each sleeve.
It is made into an aggregate made up of sheets.

With the configuration explained above, the temperature of the nichrome wire is 150
The temperature of the silicone rubber is set to LO without exceeding ℃.
The temperature inside the salt spray test tank is maintained at 50°C, but in the example of the present invention, the FRP inner wall is heated to 60°C at a test temperature of 50°C.
The temperature is 65°C.

Next, the effects of the present invention will be explained. Since the FRP inner wall is salt water resistant and heat resistant, it can withstand corrosion caused by salt water and heating in a closed space. Covering the nichrome wire prevents leakage caused by unexpected causes such as water entering the closed space, and also prevents oxidation corrosion of the nichrome wire. This covering material must be a heat-resistant electrically insulating material, silicone rubber is suitable, and fluoroplastics are also suitable. As a result of the reflective multi-layer board reflecting the heat rays emitted from the nichrome wire toward the outer wall, very little heat is emitted toward the outer wall, and the inner wall is mainly heated, and due to the influence of radiant heat, the heat rays emitted from the nichrome wire toward the outer wall are heated.
The effect of evenly heating between and B is remarkable.

Since this uniform heating is effective over the entire surface of the lid, test tube 1, and bottom, the temperature inside the test chamber rises very quickly, which is thermoeconomic, and is very effective in keeping the temperature inside the test chamber uniform. It was acknowledged that it was effective. This effect will be compared and explained next with the case of a conventional salt water spray tester.

The conventional method of heating a test tank requires heating the water first, but the amount of water is 70A? In the example where the water temperature is 60°C, the minimum amount of heat required is 350°C to lift the water temperature of 10°C in winter. In contrast, in the present invention, the heat capacities of the synthetic resin inner wall, the reflective multilayer plate, and the air layer of the closed space, which are the main bodies to be heated, are 8 kcal, 5.6 days, and 16.1 kcal, respectively.
Cal, the linear heat capacity is 2g, 7kail, which is a very small value. Therefore, while conventionally it took 2 hours for initial heating, in the present invention the test temperature is reached in 12 minutes.

Regarding the temperature distribution on the inner wall of the test chamber, in the conventional test chamber, the bottom and the part near the heater are high and the lid is low.

The temperature difference is 5-7°C. Fog has difficulty flowing into areas where the temperature is high, and if the temperature is abnormally low, it will condense on walls. In the case of the present invention, the maximum temperature difference is 1° C. or less, and the distribution at 10 locations is measured using a fog flow meter, and all of them are within the specified range.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a conventional salt spray test tank, Figure 2 is a sectional view of the test tank of the present invention, Figure 3 is an example of how the coated nichrome wire is installed, and Figure 4 is the coated nichrome wire and reflective composite. FIG. 3 is a sectional view showing a state in which the laminate is attached. 1...Test tank, 2...Salt water spray tower, 7.-
・Water 8... Heater, 10... Inner wall,
11...Space, 12...Test piece, 13
...Outer wall of the lid, 14...Inner wall of the lid, 15...
Test chamber outer wall, 16...Test chamber inner wall, 17...Lid holder, 18...Packing, 19...Coated nichrome wire, 19'...Nichrome a, 19''-...Silicon rubber , 20... Reflective multilayer plate, 21... Exhaust port, 2
2...L M-, 23...Sample frame, 24...Protrusion, 25...Metal fittings. Valve 2 diagram l diagram

Claims (1)

[Claims] A sealed space is provided between the synthetic resin inner and outer walls of the test chamber and its lid, and in the winter space, heating wires covered with heat-resistant electrically insulating material are tightly stretched around the inner wall surface, and a reflective complex is placed near the outer wall. A test tank for a salt spray test machine characterized by having a layered plate.