JPH09257285A - Humidity controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small, compact and highly accurate humidity controller by providing a preliminary saturating tank for substantially saturating humidified air produced in a humidifying tank between a saturating tank and the humidifying tank. SOLUTION: A preliminary saturating tank 10 comprises a spiral passage 10b closed from the lower part to the upper part on the outer periphery of a metallic cylinder and a plurality of fin shaped heat radiating members 10a provided radially on the outside thereof. Thus, the temperature of humidified air is brought near to a room temperature T1, the humidified air A0 from a humidifying tank 9 is passed through the spiral passage 10b from the lower part to the upper part and saturated in concordance with the room temperature and guided to a saturating tank 2 provided in series in an upper part. Excessive water W produced after being slightly cooled by the saturating tank 2 and the preliminary saturating tank 10 or the like flows down and drops to the vertically and serially arranged preliminary saturating tank 10 and the humidifying tank 9, so that the large quantity of saturated air humidified by the humidifying tank 9 can be generated without occurrence an inconvenience such as a retention on the way. Thus, the device is preferable for a long period operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity generator that generates humidity for calibrating a hygrometer.

[0002]

2. Description of the Related Art A humidity generator used to calibrate a hygrometer uses a shunt type of mixing saturated air and dry air in a saturated tank, or the temperature of a saturated tank in which water vapor is saturated, A two-temperature method, a two-pressure method, a two-temperature two-pressure method that generates a predetermined humidity by using the ratio of the pressure and the temperature of the measurement / test tank to obtain the desired humidity and the pressure. There is.

In the split-flow method, it is difficult to ensure the accuracy of the mixing ratio of saturated air and dry air, and in the 2-temperature method and 2-pressure method, the temperature difference of 0.1 ° C. is 1% RH in humidity. ,
In the two-temperature method, it is necessary to precisely maintain the temperatures of the saturated tank and the test tank, and it takes time to change the temperature of the tank. In the two-pressure method, the pressure can be switched, so the response is Fast, but usually requires a large constant temperature bath.

That is, a saturated tank (saturator, saturation device) or the like for obtaining constant-temperature and constant-humidity saturated air from the humidified air from the humidifying tank is used as such a humidity generator. Are usually supplied to the test tank, but normally, the saturation tank and the test tank are installed in a large water temperature tank to obtain a desired saturated air or the like at a constant temperature (for these points, JIS Z8806- 1981, B7920-
1994, etc.).

[0005]

However, when such a water temperature tank is used, it is necessary to control the temperature of the entire water temperature tank, the heat capacity of the controlled object is large, the control is difficult, and a uniform temperature distribution is obtained. Since it is necessary to stir the entire water temperature tank, it is difficult to evaluate the temperature distribution, and the equipment and auxiliary equipment are large and complicated.

In view of the above points, an object of the present invention is to provide a small-sized, compact, highly accurate humidity generator having a simple structure.

[0007]

According to the present invention, in a humidity generator using a two-pressure method, a pre-saturation tank for substantially saturating the humidified air generated in the humidifying tank is provided between the saturated tank and the humidifying tank. This is a humidity generator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows a humidity generator for calibrating a hygrometer by the two-pressure method, showing an embodiment of the present invention.

In the figure, a pre-saturation tank 10 and a humidification tank 9 are provided vertically and vertically below the test tank 5 and the saturation tank 2 in series. The moisturizing tank 9 provided at the bottom is, for example, a bubbling tank, and the air A that contains water W and is introduced from a lower portion by a compressor or the like and pressurized is used to clean the water W from the porous sintered metal 91 or the like. The humidified air Ao that has been bubbled and is almost saturated is introduced into the lower portion of the pre-saturation tank 10 through the pipe 92. The pre-saturation tank 10 provided in series above the humidification tank 9 has a fin-shaped radiator 10a on the outside to promote heat exchange with the outside air and to humidify the air A.
The temperature of o is brought close to room temperature to adjust the temperature to almost saturated air and introduced into the saturation tank 2 provided in series above the pre-saturation tank 2.

The saturation tank 2 is provided below the inside of the high thermal conductor 1 such as a metal block of aluminum, copper or the like having good thermal conductivity, and the test tank 5 is provided above the inside of the high thermal conductor 1. They are integrally provided in series vertically. That is,
The saturation tank 2 and the test tank 5 are integrally formed in the high thermal conductor 1 by, for example, hollowing or close contact.
This saturation tank 2 forms a closed space inside the high thermal conductor 1,
The bottom of the inner space is made into a basin shape for containing water W,
Sufficient saturated air A1 having a temperature T1 and a pressure P1 of 100% RH is taken from the outside with a structure in which the air A0 introduced from the lower portion passes through the surface of the water W. The thermal conductivity of aluminum and copper that constitute the high thermal conductor 1 is about 420 to about that of water.
720 times, extremely high thermal conductivity, 0.1 ℃ as a whole
Soaking property within is easily obtained.

The saturated air A1 from the saturation tank 2 is
The pressure-reduced air is decompressed by the pressure regulating valve 3 and passed through a pipe 31 having a heating means 4 for preventing a temperature decrease due to adiabatic expansion. A passage 51 in the heat conductor 1 formed in a spiral shape in the
Is passed from above to below and supplied to the test tank 5. The pressure of the air A2 is reduced to P2 in the space 50 sealed by the lid of the test tank 5, the temperature is T2 (T1 = T2) at room temperature, the saturation tank 2 and the pressures P1 and P2 of the test tank 5 are the pressure gauge 61. , 62. In addition, the pressure of the saturation tank 2 and the pressure of the test tank 5 can be measured with only one pressure gauge 62 by the switching means, which simplifies. Alternatively, only the pressure in the saturation tank 2 may be measured, and this and the atmospheric pressure equivalent to the pressure in the test tank 5 may be switched and measured by one pressure gauge 61.

The temperature T0 of the humidifying tank 9 is measured by the thermometer 71.
The temperature T2 of the saturation tank 2 or the test tank 5 (=
T1) is detected by the temperature sensor 72 provided in the high thermal conductor 1, and both temperatures T0 and T2 are input to the control means 7.
The control means 7 uses the heater 70 at the operating end 8 so that the temperature T0 of the humidifying tank 1 detected by the temperature sensor 71 becomes slightly higher than the room temperature T2 detected by the temperature sensor 72 (T0> T2).
The power supply E supplied to Therefore, a hygrometer or the like is inserted into the space 50 of the test tank 5 to calibrate the hygrometer. or,
Extra water W generated by being slightly cooled in the saturation tank 2, the preliminary saturation tank 10, etc., is the preliminary saturation tank 1 vertically arranged in series.
0, it does not cause inconveniences such as flowing down and falling into the humidifying tank 9 and stagnating in the middle, circulation by a pump or the like is unnecessary, and a large amount of humidified saturated air is generated by providing the humidifying tank 9. It is possible and suitable for long-term operation.

That is, generally, the relative humidity U is given by the following equation.

U = (P2 / P1) · (e1 / e2) × 100 (1) where P1 is the pressure of the saturation tank 2, P2 is the pressure of the test tank 5,
e1 is the saturated water vapor pressure at the temperature T1 of the saturation tank 2, e2
Is the saturated water vapor pressure at the temperature T2 of the test tank 5.

In FIG. 1, since the temperature T1 and the temperature T2 are isothermal at room temperature in the two-pressure method, e1 = e2 and the pressures P1 and P2.
2, the relative humidity of 100% RH or less is obtained from the following equation.

U = (P2 / P1) × 100 (2) FIG. 1B is a structural explanatory view showing a slightly detailed embodiment of the pre-saturation tank 10, and the same reference numerals as those in FIG. Indicates. This pre-saturation tank 10 is formed by sealing a spiral passage 10b from the lower side to the upper side on the outer periphery of a metal cylinder body, and a plurality of fin-shaped radiators 10a are radially arranged on the outer side thereof.
The humidified air Ao is provided to bring the temperature of the humidified air Ao close to the room temperature T1, and the spirally formed passage 10b is provided to the humidified air A0 from the humidifying tank 9.
Is passed from the lower part to the upper part so as to be saturated with the room temperature and introduced into the saturated tank 2 provided in series at the upper part.

If the pre-saturation tank 10 is between the humidification tank 9 and the saturation tank 2, the same effect can be obtained regardless of the vertical arrangement and any arrangement.

[0018]

As described above, according to the present invention, in the humidity generator by the two-pressure method, the pre-saturation tank for substantially saturating the humidified air generated in the humidification tank is provided between the saturation tank and the humidification tank. The humidity generator is provided. For this reason, a compact, compact and simple structure can be realized, a large-sized constant temperature water tank is not required, and extremely accurate humidity can be generated, which is suitable for calibration of a hygrometer. Further, since the pre-saturation tank for bringing the humidified air generated in the humidifying tank close to room temperature and saturation is provided between the saturated tank and the humidifying tank, the humidified air can be sufficiently adapted to the room temperature, and further, By providing a radiator on the outside, or by passing the humidified air from the humidifying tank upward from below through a spirally formed passage,
Even more saturated air at room temperature can be obtained. Furthermore, since a pre-saturation tank is provided below the saturation tank, and a humidification tank is provided below the pre-saturation tank, for example, in series, excess water generated by cooling in the saturation tank and the pre-saturation tank is arranged in series. There is no inconvenience such as falling down to the humidifying tank or the pre-saturation tank, dropping, and stagnating on the way, and circulation by a pump is unnecessary. Further, by providing the humidifying tank, it is possible to generate a large amount of saturated humidified air, which is suitable for long-term operation. As a whole, there is no need for a large device such as a constant temperature water tank, and a hygrometer calibration device can be made compact and compact.
It can also be used in devices other than the two-pressure method.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

 1 High Thermal Conductor 2 Saturation Tank 3 Pressure Control Valve 4 Heating Means 5 Test Tank 61, 62 Pressure Gauge 7 Control Means 70 Heater 8 Operating End 9 Humidification Tank

Claims (3)

[Claims] 1. A humidity generator according to the two-pressure method, wherein a pre-saturation tank for substantially saturating the humidified air generated in the humidification tank is provided between the saturation tank and the humidification tank. . 2. The humidity generator according to claim 1, wherein the pre-saturation tank is provided with a radiator on the outside. 3. The humidity generator according to claim 1, wherein the pre-saturation tank allows humidified air from the humidification tank to pass upward from below through a passage formed in a spiral shape.