JPS6114456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam pressurization test device that can heat a sample to an arbitrary temperature and apply a steam pressure of a desired relative humidity.

Conventional steam pressurization test equipment can be roughly divided into the following two types. Namely, the first method is to control the relative humidity in the test tank containing the sample by controlling the amount of water spouted from the boiler into the test tank, and the second method is to control the relative humidity in the test tank containing the sample. By keeping the airtight container at a specific temperature, water vapor with a relative humidity of 100% at that temperature is generated inside the airtight container.

The former is within the temperature range from room temperature to 100℃,
Although it has the characteristic that relative humidity can be controlled quite easily from normal humidity to around 100% humidity, it has the disadvantage that it is not possible to control relative humidity when the temperature exceeds 100℃ because the test chamber is not sealed. had the disadvantage that it could only be tested at a constant relative humidity of 100%.

The present invention eliminates the drawbacks of conventional steam pressurization test devices, and provides a steam pressurization test device that can freely control the relative humidity of the steam that provides the sample even at temperatures below 100℃ as well as above 100℃. The first tank that contains the sample, the second tank that contains water, and the pipe that communicates between the two tanks by blocking heat transfer between the two tanks are integrally constructed. It is characterized by forming a closed container.

Embodiments of the present invention will be described below with reference to the drawings. The steam pressurization test apparatus of the present invention includes a first tank 1 that accommodates a sample M, a second tank 2 that is filled with water W,
It consists of a tube 3 that communicates the two tanks 1 and 2, and this tube 3 is a thin tube in order to suppress the transfer of heat between the two tanks 1 and 2 as much as possible. Further, the first tank 1, the second tank 2, and the pipe 3 are integrally constructed, and form a sealed container having a constant volume as a whole.

The drawing shows an example in which the steam pressurization test apparatus of the present invention is installed in a constant temperature bath. That is, a heat insulating material 6 is interposed between the thermostatic chambers 4 and 5 stacked one above the other, and the first chamber 1 is placed in the upper constant temperature chamber 4 and the second chamber 2 is placed in the lower constant temperature chamber 5. Install both tanks 1,
A pipe 3 connecting the two is passed through both thermostatic chambers 4 and 5 and is piped through a heat insulating material 6.

The heat insulating material 6 prevents the transfer of heat between the constant temperature chambers 4 and 5, and also prevents the transfer of heat inside and outside the tube 3. Furthermore, the internal temperatures of both constant temperature baths 4 and 5 can be controlled by separate operations. A wire mesh 8 is appropriately placed in the first tank 1, and the sample M is placed on the upper surface of the wire mesh 8. The second tank 2 is supported by a support stand 7 if necessary, and water W is filled inside the second tank 2.

In the embodiment, when the insides of the constant temperature chambers 4 and 5 are heated and maintained at a predetermined temperature, the water vapor generated from the second chamber 2 at that temperature passes through the pipe 3 to the first chamber in the upper stage.
It moves into tank 1, and the water vapor pressure becomes uniform in both tanks 1 and 2. The water vapor pressure at this time is equal to the saturated water vapor pressure at the temperature inside the second tank 2.

Now, let T ₁ be the temperature in the first tank 1 containing the sample M, and T ₂ be the temperature in the second tank 2 containing the water W.
(T ₁ ≧ T ₂ ), and the saturated water vapor pressures at temperatures T ₁ and T ₂ are P ₁ and P ₂ , respectively, then the relative humidity in the first tank 1 is
RH is expressed by the following formula (1).

RH=P ₂ /P ₁ ×100 (%) ......(1) By changing the saturated water vapor pressures P ₁ and P ₂ in the above formula (1), that is, the By changing the temperature T1 in the first tank ₁ and the temperature _T2 in the second tank 2 filled with water W, it is possible to obtain a water vapor pressure with an arbitrary relative humidity in the first tank 1. can. Temperatures T ₁ and T ₂ in each tank 1 and 2
can be freely set by controlling the temperature in each thermostatic chamber 4, 5, and since the above equation (1) holds true in any temperature range, it can be set not only below 100℃ but also at 100℃.
The relative humidity in the first tank 1 can be set at any of the above temperatures.

As mentioned above, in the embodiment, the first tank 1 and the second tank
Constant temperature chambers 4 and 5 in which the chamber 2 is stacked on top of each other separately.
Although we have shown an example where the temperature chambers are housed in a chamber, this is not limited to the case where thermostatic chambers are installed vertically, but it is also possible to install them in horizontal chambers in parallel, and it is also possible to use thermostatic chambers. Alternatively, the outer surfaces of the first tank and the second tank can be heated to a constant temperature using a heater or the like.

As described above, the present invention provides a first
Both the tanks 1 and 2nd tank 2 containing water W,
2 are connected by a pipe 3 of a certain length that suppresses heat transfer as much as possible to form a sealed container with _{a constant} volume as a whole. A vapor pressure with an arbitrary relative humidity can be obtained in the tank 1 at a specific temperature, and therefore the sample M stored in the first tank 1 can be heated not only at a temperature of 100°C or lower but also at a temperature of 100°C or higher. It is possible to perform a steam pressurization test by applying an arbitrary relative humidity, and it is possible to eliminate the drawbacks of conventional steam pressurization test devices at once.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1...First tank, 2...Second tank, 3...Pipe, M...
...Sample, W...Water.

Claims (1)

[Claims] 1. A water vapor characterized by integrally comprising a first tank containing a sample, a second tank filled with water, and a pipe that communicates between the two tanks by blocking heat transfer between the two tanks. Pressure test equipment.