JPH0129254B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for testing test objects, which are various members, at a predetermined temperature.
The present invention relates to a moisture resistance testing device used to test the moisture resistance of a test object by placing it in steam under pressure.

Conventionally, this type of device has an opening/closing lid a as shown in Figure 1.
The test object T is stored in a heating test tank b that can be sealed tightly, and the distilled water c in the test tank b is evaporated by a heater d to generate steam, or steam is introduced into the test tank b from the outside. Since the side wall b' and opening/closing lid a of the heating test chamber b are affected by outside air and become low temperature, dew condensation occurs on the inner surface of the part concerned, and this condensation occurs on the test object T. There are defects such as dripping and a partial saturated steam atmosphere inside the heating test tank b, which results in a decrease in test accuracy, variations in test data, and poor reproducibility. There were some problems.

Therefore, as shown in the same figure, a device in which heaters f and f' are attached to the opening/closing lid a and the side wall b' via heat insulating materials e, e' has already been used, but even with this, the area around the opening/closing lid a is Due to the structure, it is difficult to sufficiently heat the part a' and the upper part b'' of the side wall b', and it is impossible to eliminate dew condensation and the generation of a partial steam atmosphere in these parts. Although it has been attempted to raise the heating temperature of f', in such a case the temperature distribution and humidity distribution within the tank deteriorate, resulting in variations in test data.

In view of the above-mentioned difficulties, the present invention has a two-tank structure consisting of an outer heating tank and an inner testing tank housed in the heating outer tank, instead of using a single tank type as in the past. This is intended to solve the problems of the conventional method by making it possible to timely introduce the liquid into the test inner tank, and this will be described in detail below with reference to the embodiment shown in FIG.

In the figure, reference numeral 1 denotes a heating outer tank made of metal or the like, which, like the conventional heating test tank b, is equipped with a steam generator 3 for heating distilled water 2 stored in the tank 1 in the illustrated embodiment. However, it is also possible to introduce steam from an external steam generator into the outer heating tank 1 as in the past, and furthermore, a heater 6 is provided on the outer periphery of the side wall 4 via a heat insulating material 5. At the same time, a heater 10 is also provided on an opening/closing lid 8 provided to form a sealed heating space 7 in this outer heating tank 1 via a heat insulating material 9.

Furthermore, the present invention has an inner test tank 11 made of metal or the like which is housed in the sealed heating space 7 and held in a predetermined position by appropriate means (not shown). A leg stand 13 on which the object T can be placed in a removable manner is provided, and a closed test space 14 is created in the test inner tank 11 by providing the opening/closing lid 12.
is formed.

The test inner tank 11 has an air supply opening/closing valve 15 interposed therein, which communicates with the sealed test space 14 at the upper part of the side wall thereof, and an air pipe 16 with an end opened into the sealed heating space 7 protrudes. In addition, from the bottom wall of the inner tank 11, an exhaust pipe 18 with an exhaust opening/closing valve 17 communicating with the sealed test space 14 is attached to the outer heating tank 1. 1 shows an exhaust port with an on-off valve and a drain port with an on-off valve connected to the upper side wall and the bottom wall of the outer tank 1, respectively.Although not shown, the heating outer tank 1 has a heating section with a temperature sensor, a temperature controller, etc. is provided, and the steam temperature in the sealed heating space 7 can be controlled to a set temperature by the heating section, which is the same as in the heating test tank b in the conventional apparatus.

Therefore, in order to use the above device, first open the lids 8 and 12 of the outer heating tank 1 and the inner test tank 11,
After setting the test object T in the test inner tank 11, the lids 12 and 8 are closed in sequence, and steam is generated by heating the distilled water 2 by energizing the steam generator 3, or by heating the distilled water 2 from the outside. steam is introduced,
At this time, the heaters 6 and 10 are controlled to be energized simultaneously or in advance so as to heat the steam in the sealed heating space 7 to around the heating temperature to be heated.

After confirming that the temperature of the sealed heating space 7 has been raised to the above-mentioned heating temperature in this way, and that the temperature inside the test tank 11 has also been raised to the same heating temperature, the air supply opening/closing valve 15 and the exhaust The on-off valve 17 is opened by electromagnetic means or the like, thereby introducing the steam in the sealed heating space 7 into the sealed test space 14 of the test inner tank 11, and exhausting the air in the space 14 to replace the air with steam. do.

As a replacement method, a vacuum pump (not shown) may be connected to the exhaust pipe 18 to exhaust the air in the sealed test space 14, and then steam from the sealed heating space 7 may be introduced.

When the replacement is completed in this way, the temperature and pressure of the steam introduced into the test interior 11 begin to rise, but at this time, the temperature and pressure inside the heating outer tank 1 are higher than the temperature and pressure. The steam in the sealed heating space 7 may be controlled so as to increase the humidity, and the moisture resistance test may be conducted on the test object T using a conventional method.

The present invention, as embodied by the above embodiments,
A heating outer tank 1 that can form a sealed heating space 7 in which steam can be stored with an opening/closing lid 8 and is provided with a heating section that can control the steam in the sealed heating space 7 to a set temperature, and this sealed heating space 7. It consists of a test inner tank 11 that can form a sealed test space 14 in which the test object T can be freely inserted and removed by an opening/closing lid 12. Exhaust pipe 1 with on-off valve 17
8 and an air supply pipe 16 with an air supply opening/closing valve 15 for supplying steam from the sealed heating space 7 into the test space 14, so that condensation does not occur in the outer heating tank 1. However, since the test object T is housed in the test inner tank 11, it is not affected by the condensation even after the steam obtained from the heating outer tank 1 is introduced into the test inner tank 11 in a timely manner. By keeping the temperature and pressure in the sealed heating space 7 higher than the temperature and pressure in the sealed testing space 14, it is possible to prevent the formation of a partial saturated layer in the sealed testing space 14. A dry and stable steam atmosphere can be created in the test inner tank 1, and as a result, it is possible to conduct a moisture resistance test with high accuracy and good reproducibility.

In the illustrated embodiment, a vertical type is shown, but it goes without saying that a horizontal type may also be used.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional front view showing a conventional moisture resistance testing apparatus, and FIG. 2 is a schematic longitudinal sectional front view showing an embodiment of the heat resistance testing apparatus according to the present invention. 1... Outer heating tank, 7... Closed heating space, 8...
Opening/closing lid, 11... Test inner tank, 12... Opening/closing lid, 1
4... Sealed test space, 15... Air supply opening/closing valve,
16...Air supply pipe, 17...Exhaust opening/closing valve,
18...Exhaust pipe.

Claims (1)

[Claims] 1. A heating outer tank that can form a sealed heating space in which steam can be stored with an opening/closing lid, and is equipped with a heating section that can control the steam in the sealed heating space to a set temperature, and a heated outer tank that is housed in the sealed heating space. It consists of an inner test tank that can be opened and closed to form a sealed test space in which the test object can be freely inserted and removed. 1. A high-precision moisture resistance testing device, characterized in that an air supply pipe with an air supply opening/closing valve is attached to supply steam from the sealed heating space into the test space.