JPS60125551A - Ventilating method of thermal shock test tank - Google Patents

Abstract

PURPOSE:To shorten the temperature varying time by transferring air at extreme temperature in a test tank to a gas tank and sending air at another extreme temperature in the gas tank into the test tank. CONSTITUTION:Air at a low temperature in a test tank 1 is transferred to a gas tank 10 by a solenoic valve 17 and a blower 9a. Thereafter, outside air is introduced into the tank 1 to set the inside of the tank 1 to a normal temperature. Next, air is heated for the purpose of raising the temperature of air in the tank 1 to an extremely high temperature. After the extremely high temperature is held for a fixed time, varying to an extremely low temperature is started. At this time, solenoid valves 17 and 18 of pipings 11 and 19, check valves 12 and 20, and blowers 9a and 9b are operated simultaneously to interchange air at the high temperature in the tank 1 and air at the low temperature in the tank 10. Consequently, air in the tank 1 has a temperature approximating 0 deg.C, and air is cooled from this temperature to a low temperature, and thus, the time required for temperature variation is shortened, and the energy consumption is reduced.

Description

[Detailed Description of the Invention] [Background and Objectives of the Invention] The present invention relates to an article, particularly to a t-hair agricultural test. Ki'A, related to Riichiho.

In general, thermal testing is widely applied to electrical insulators. These types of thermal and thermal tests include the so-called heat shock test, in which the specimen is immersed alternately in cooling liquid and high-temperature liquid, and the air-cooled total heat test, in which the specimen is placed in the test premises and the air temperature inside the tank is lowered. The present invention relates to the heat cycle test, which is broadly divided into the so-called heat cycle test in which the test temperature is alternately changed to high temperature and high temperature.

FIG. 1 is a cross-sectional view schematically showing a conventional test tank for heat cycle testing of epoxy insulators, which are molded insulation products. The interior chamber 4 of the test chamber 1 is generally cooled by cold air sent through a cooling pipe 6 and a solenoid valve 7 from a refrigerator (not shown) that uses fluorocarbon gas or the like.
Heating to the high temperature side is performed by a heater 8, and a circulation fan 5 is provided indoors to reduce the indoor temperature gradient.

FIG. 5 shows the temperature change inside the tank during a thermal test using such a conventional test tank. Cooling to the cold side extreme temperature, generally -50°C, begins at time a, and once this extreme temperature has been achieved, this temperature is maintained for a scheduled time until time C, after which the other hot side Temperature measurement (e.g. +9
0° C.). If the temperature measurement on the high temperature side is achieved at time d, that temperature is maintained for the scheduled time, and cooling to the low temperature side pole begins at time e, and this is repeated until the scheduled number of cycles is completed. .

As is clear from this figure, in the conventional method, time C
The temperature change from time d to time d and the temperature change from time e to time f occur continuously through 0° C., respectively. That is, the temperature at the start point toward the target extreme portion is carried out from the other extreme temperature that is the farthest away. Therefore, this temperature conversion requires a large amount of energy over a long period of time.

It is an object of the present invention to provide a method for ventilating the air in a thermal test chamber that makes it possible to minimize the time and energy required for this temperature conversion.

[Summary of the Invention] According to the present invention, in temperature conversion from one pole to the other pole, the air inside the tank, which has already been set as one pole, is transferred to an air storage tank provided outside the test tank, and The above objective is achieved by sending the other extreme air, which was achieved in the previous step and accumulated in the air storage tank outside the test tank, into the test tank.

〔Example〕

FIG. 3 is a schematic diagram showing a first example for carrying out the invention. In this example, one air storage tank 10 is attached to the test tank 1, and the inner chamber 4 of the test tank 1 is a pipe having a solenoid valve 17 and a check valve 12 that opens in the direction of the air storage tank 10. Like 11, it is connected to the inside of the air storage tank 10 by a pipe 19 having a solenoid valve 18 and a check valve 20 that opens in the direction of the test tank 1. Of course, the air storage tank 10 is composed of an insulating wall.

For piping 11, a blower 9a is provided on the test tank side, and for piping 19, a blower 9b is provided on the air storage tank side.

In this example, the air storage tank 10 is evacuated by appropriate means, and the air in the test tank 1, which has been brought to one extreme, e.g. At time C in Fig. 5, the solenoid valve 17 and blower 9a are operated to fill the air storage tank 10, and then outside air is introduced into the test tank 1 by appropriate means to bring the temperature to near 0°C. . Therefore, heating to +90 DEG C. will be carried out from that temperature, and the temperature measured on the high temperature side will be achieved at d', as shown by the dotted line in FIG.

The temperature measurement on the high temperature side is maintained for a certain period of time, but in this case, it naturally ends at time e', and at this time e' the conversion to the low temperature side starts. At this point, the solenoid valves 17 and 18 of the pipes 11 and 19, the check valves 12 and 20, and the blower 9a,
9b are all activated simultaneously.

As a result, the high temperature air in the test cypress 1 and the low temperature air in the air storage tank 10 are exchanged, and the temperature in the test tank becomes close to 0° C., and cooling from this temperature to a low temperature is performed. Therefore, the low temperature is f
, which is achieved at point K, the time between the poles is significantly shortened, and therefore the energy required for it is also significantly reduced.

FIG. 3 shows a device for carrying out the method of the present invention, in which two storage tanks 13 and 13' are provided, each having a pipe 21 with a solenoid valve 23 and a solenoid valve 24. Piping 2
2 is connected to the test tank 1. In this example, for example, high temperature air is exchanged through piping 21 and low temperature air is exchanged through piping 22.

Figure 4 shows an example in which a single storage tank 14 is used for multiple test tanks 1a, tb, lc, and only solenoid valves are used in the piping, but check valves, etc. are used as appropriate. By using this, the system shown in FIG. 2 or 3 can be used as the air storage tank 14.

Note that the operation timings of the electromagnetic valves, check valves, blowers, etc. in FIGS. 2, 3, and 4 are obvious to those skilled in the art, and detailed explanations thereof will be omitted.

〔Effect of the invention〕

As described above, according to the present invention, when converting from one low temperature to the other extreme part, it is possible to immediately bring the temperature from one low temperature to around θ℃, and the change to the other extreme part is at that temperature. It will start from. Therefore, the time required for temperature conversion can be cut in half, and the required energy can be significantly reduced accordingly, making it extremely economical.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a conventional cooling and heating test grade board, FIG. 2 is a schematic diagram showing an example of a configuration for carrying out the method of the present invention, FIG. 3 is a schematic diagram showing another example, and FIG. The figure is a schematic diagram showing still another configuration, and FIG. 5 is a diagram showing the difference in effect between the conventional method and the method of the present invention. l...Test tank, 9a, 9b...Blower, 6.1
1.19,21゜22・°・Piping, 10.1!1.13
114... Air storage tank, 7.17.18° view 1st eye 3rd mouth M 4 figure cold 5fiJ +qo'c-- -1- generation

Claims (2)

[Claims] (1) In the continuous cooling and heating test, from the first scheduled extreme temperature to the second
When converting to the predetermined extreme temperature, the air in the test tank that is at the first predetermined extreme temperature is transferred to the first air storage tank, and then transferred from the second predetermined extreme temperature to the first predetermined extreme temperature. Ventilation method 4 for a thermal test chamber characterized by the use of (2) A second air storage tank is provided to store the air at the second predetermined extreme temperature in the test tank, and use it when converting the first predetermined extreme temperature to the second predetermined extreme temperature. A method for ventilating a thermal test tank according to claim 1, characterized in that: