JPH03225137A - Humidity control method and equipment for test room atmosphere - Google Patents

Abstract

PURPOSE:To adjust the humidity of a laboratory easily ad quickly by a method wherein, moist air is produced by making dry air pass through water, mixing it with dry air at a ratio in accordance with an objective humidity and supply the laboratory with the obtained air. CONSTITUTION:The title apparatus is composed of, for example, a dry air supply line 2 with which the title apparatus communicates with the a laboratory, and a moist air forming line 3. The dry air supply line 2 introduces dry air from a specified supply source, mix it with moist air and feed it into the laboratory chamber 1. The moist air forming line 3 is for allowing the dry air from an incoming line 3a to pass through the water contained in a bubbling tank 20 to produce moist air. The moist air is again made to flow from a discharge line 3b to the dry air supply line 2 and is mixed with the dry air. When the absolute humidity of the mixed air being detected by an absolute hygrometer 15 is higher than the preset value of the humidity inside the laboratory 1, the opening of a solenoid valve 21 installed in the moist air forming line 3 is decreased, and on the other hand, if the above values are contrary, a solenoid valve 13 installed in the dry air feed line 2 is partly closed, thereby, the humidity in the laboratory 1 is maintained at a constant value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for adjusting humidity in a test chamber used when testing the physical properties of rubber or the like.

(Conventional technology) Heat deterioration tests and weather resistance tests on various rubbers and rubber molded products are extremely important for evaluating the physical properties of rubber. As the materials are used more widely, physical property tests under harsh conditions are becoming necessary.

Conventionally, thermal deterioration tests and weather resistance tests are generally carried out by placing the test piece in a thermostat, and the temperature and humidity conditions in the test chamber (temperature chamber) are set using electric heat. Temperature is controlled by supplying heated air into the test chamber using a heater, heat exchanger using constant-temperature steam, etc. ■ Relative humidity is adjusted by supplying moisture into the test chamber and evaporating it. It was done by this means.

(Problem to be solved by the invention) However, when temperature control is performed by the above method (■),
Since air is supplied from outside the test chamber, there is a problem in that the humidity is affected by the surrounding environmental conditions, and the above
Humidity adjustment by this means is controlled by relative humidity, so it cannot be used under high temperature conditions (e.g. above 100'C).
There were disadvantages in that it was difficult to set low humidity conditions and it took time to change the temperature and humidity.

Therefore, an object of the present invention is to provide a method and apparatus for adjusting humidity that can easily and quickly adjust the humidity in a test chamber, and can also set a low humidity state even under high temperature conditions of 100'C or higher. Our goal is to provide the following.

(Means for Solving the Problems) According to the present invention, humid air formed by passing dry air through water is mixed with dry air in a proportion corresponding to the humidity to be adjusted in the atmosphere of the test room, A method for controlling the humidity of an atmosphere in a test room is provided, which is characterized by supplying the mixed air into the test room.

Further, according to the present invention, a humidity control device for the atmosphere in a test room includes a dry air supply line that communicates with the test room, and a humid air formation line that branches from the dry air supply line and joins the dry air supply line again. The humid air forming line is configured such that the dry air flowing from the dry air supply line passes through water to form humid air, and the humid air forming line is configured such that the dry air flowing in from the dry air supply line passes through water to form humid air, and the humid air forming line is configured so that the dry air flowing in from the dry air supply line passes through water to form humid air. The control mechanism is equipped with a control mechanism that adjusts the humidity of the mixed air to be supplied into the test chamber by detecting the absolute humidity and adjusting the amount of dry air flowing into the humid air formation line according to the detected absolute humidity. A dampening device is provided.

That is, the present invention has succeeded in achieving the above-mentioned object by an extremely simple means of using a mixture of dry air and moist air formed by passing dry air through water.

If such a method is adopted, for example, if the temperature of the water passing through the dry air is set at a constant temperature, the humid air that is formed will always have a constant moisture content, so that the humid air and the dry air can be separated. It is possible to form mixed air having any absolute humidity simply by controlling the mixing ratio with the test chamber, making it possible to easily and accurately adjust the humidity in the test chamber.

Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.

In FIG. 1 showing an example of a device for suitably carrying out the humidity control method of the present invention, this device generally consists of a dry air supply line 2 and a humid air formation line 3 communicating with a test chamber 1. Consisting of

In the test chamber 1, a test object is placed, and various physical property tests such as a thermal deterioration test and a weather resistance test are performed under predetermined conditions. For example, a propeller fan 5 is provided in the test chamber 1, and its operation maintains the indoor atmosphere in a constant state.
Furthermore, a heater such as a heater or a heat exchanger 6 and a temperature regulator 7 are provided.
is provided so that the inside of the test chamber I can be maintained at a desired constant temperature condition. For example, the temperature inside this test chamber is 0 to 300°C, especially 20 to 300°C.
It can be adjusted within the range of C.

As shown in the figure, the dry air supply tube 2 is provided with a valve 10, a pressure gauge 1), a flow meter 12, a solenoid valve 13, a valve 14, and an absolute hygrometer 15 in this order. Dry air is introduced from a source (not shown);
Dry air is supplied into the test chamber 1 through this line 2 in the form of mixed air with humid air.

The moist air forming line 3 is composed of a lead-in line 3a branching off from the dry air supply line 2, a bubbling tank 20 filled with water, and an exhaust line 3b communicating with the dry air supply line 2. ing. The lead-in line 3a is provided with a solenoid valve 21 and a valve 22 in this order, and the tip of the line 3a is located underwater in the bubbling tank 20. Furthermore, an exhaust line 3 is connected above the water surface in the bubbling tank 20.
The tip of b is located.

That is, the dry air introduced from the lead-in line 3a passes through the water in the bubbling tank 20 to become humid air, and flows through the exhaust line 3b to the dry air supply line 2 again, where it is mixed with dry air and sent to the test chamber 1. It flows within.

In the present invention, the absolute hygrometer 15 and the solenoid valve 13
．． A humidity adjustment control mechanism 30 is provided in conjunction with the humidity adjustment control mechanism 21, and by this operation, the absolute humidity of the mixed air supplied into the test chamber 1 is adjusted. That is, when the absolute humidity of the mixed air detected by the absolute hygrometer 15 is higher than the preset humidity in the test chamber 1, a signal from the control mechanism 30 causes a On the other hand, when the absolute humidity of the mixed air is lower than the preset humidity in the test chamber 1, a signal from the control mechanism 30 causes the drying to start. A solenoid valve 13 provided in the air supply line 2 is throttled to reduce the amount of dry air. In this way, mixed air having an absolute humidity corresponding to a preset absolute humidity is supplied into the test chamber 1, and the inside of the test chamber 1 is maintained at a constant humidity.

In the embodiment shown in FIG. 1, a heater is installed in the bubbling tank 20 to form humid air with a constant humidity.
0 and a temperature adjustment mechanism 41 are provided to maintain the water temperature in the tank 20 at a constant temperature. Furthermore, a drainage line 51 equipped with a valve 50 and a water supply line 54 equipped with a valve 52 and a solenoid valve 53 are connected to the bubbling tank 20, and a water volume adjustment mechanism 55 is provided in the tank 20. When the amount of water in the tank exceeds a certain amount, the solenoid valve 53 is closed and water supply is stopped, and when the amount of water in the tank becomes less than a certain amount, the solenoid valve 53 is opened and water is supplied.

Thereby, humid air can be effectively formed constantly and continuously.

Further, in order to drain water accumulated in the test chamber 1, it is preferable to provide a bypass 70 communicating with the drain. That is, when water accumulates in the test chamber 1, the valve 71 is opened and water is drained from the bypass 70.

In addition, in the present invention, as shown in FIG.
′ is preferably provided. This supply line 2' is provided with a solenoid valve 80 and a valve 81. That is, when setting the inside of the test chamber 1 to low humidity, both the main line 2 and the supply line 2' are left fully open, and the amount of dry air flowing into the line 3 is adjusted in this state.
A low-humidity mixed air is formed, and the inside of the test chamber 1 can be quickly adjusted to low humidity. When setting the inside of the test chamber 1 to low humidity, it is sufficient to close the supply line 2. In the present invention described above, various design changes are possible without impairing the purpose of the present invention. For example, 1st
It is also possible to install an absolute hygrometer 15 in the test chamber 1 at the same time.

(Example) Using the apparatus shown in Part 1, the following tests were conducted under various environmental conditions.

Trial 1■1) Outside temperature O'C1 Absolute humidity 0.002kg/kgdrya
Under the environmental conditions of ir (relative humidity 60χ), the conditions in the test room were set at 250°C1 absolute humidity 0.002kg/kg.
It was a dry air.

In addition, under the same environmental conditions as Test Example 1, the conditions in the test room were set to 2.
50°C1 absolute humidity 0.020kg/kgdryair
And so.

Wipe fold ± Yu outside temperature 30°C2 absolute humidity 0.020kg/kg dry
The conditions in the test chamber were set in the same manner as in Test Example 1 under the environmental condition of air (relative humidity 75χ).

The conditions in the test room were set the same as in Test Example 2 under the same environmental conditions as in Test Example 3.

Outside temperature 35°C1 Absolute humidity 0.030kg/kg dry
The conditions in the test room were set in the same manner as in Test Example 1 under the environmental condition of air (relative humidity 80x).

In each of the above test examples, the apparatus shown in FIG. 1 was operated, and the temperature and absolute humidity in the test chamber were measured 10 minutes after the start of the test. The measurement results are shown in Table 1.

(Effects of the Invention) As is clear from the above embodiments, according to the present invention, the temperature and humidity (absolute humidity) in the test chamber can be quickly and arbitrarily set without being influenced by environmental conditions, and in particular, can also be set accurately. Thereby, rubber physical properties etc. can be measured accurately under various conditions.

In particular according to the invention 0.001-0.04 kg/kg
Humidity adjustment can be effectively performed within the absolute humidity range of the dryair.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of an apparatus for suitably implementing the humidity adjustment method of the present invention.

Claims (2)

[Claims] (1) Humid air formed by passing dry air through water is mixed with the dry air at a ratio corresponding to the humidity to be adjusted in the atmosphere of the test room, and the mixed air is supplied into the test room. How to control the humidity in the test room atmosphere. (2) A humidity control device for the atmosphere in a test room, comprising a dry air supply line that communicates with the test room, and a humid air formation line that branches off from the dry air supply line and joins the dry air supply line again, The humid air forming line is configured such that dry air flowing from the dry air supply line passes through water to form humid air, and detects the absolute humidity of the mixed air of humid air and dry air. A humidity control device is provided with a control mechanism that adjusts the humidity of the mixed air to be supplied into the test chamber by adjusting the amount of dry air flowing into the humid air formation line according to the detected absolute humidity.