JPH0623711B2 - Humidity detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a humidity detector having a detection unit for detecting humidity in an atmosphere.

[Prior art]

For example, in the coloring step at the time of dyeing and finishing the fiber, the cloth is steamed in a steamer to dye the dye on the cloth to develop the color.

The atmospheric temperature in the steamer is maintained at about 100 ° C., and the relative humidity is controlled to be a predetermined high temperature and high humidity value of around 100%. This is because the humidity inside the steamer is a major factor in determining the color development state of the product.

Therefore, as a humidity detector capable of detecting the humidity inside the steamer with high accuracy, for example, one shown in FIG. 4 is known.

In the figure, 1 is a detection unit for directly detecting the humidity in the steamer by directly contacting with water vapor, which is composed of, for example, a polymer thin film sensor, and a tip of a supporting member 2 protruding in the steamer. Is attached to the section. For the supporting member 2, for example, Teflon having low heat conductivity and heat resistance is used.

Further, 3 is a heater, for example, the internal relative humidity is 9
When the operation of the steamer at 8% (100 ° C.) is stopped, the steamer is turned on for a predetermined time to prevent dew condensation on the surface of the polymer thin film sensor 1.

This is because the detection unit of this kind such as the polymer thin film sensor 1 is structurally low in wet resistance, and its life becomes extremely short if it is kept wet for a long time.

[Problems to be solved by the invention]

However, in the above conventional humidity detector, the heater 3
When is turned on, the surface of the polymer thin film sensor 1 is heated remarkably, and therefore it is not easy to control the temperature so that the surface of the polymer thin film sensor 1 is heated in a uniform state. There was a point.

Such a state occurs, for example, in the above-mentioned color development step, when the temperature rise cannot follow an increase in the humidity at the time of starting the machine, or when the decrease in the humidity is delayed with respect to the decrease in the temperature when the machine is stopped.

Therefore, an object of the present invention is to prevent dew condensation on the surface of the detection unit without directly heating the surface of the detection unit by controlling the heater as in the conventional device. It is to provide a humidity detector having a function capable.

[Means for solving problems]

In order to achieve the above object, the main means adopted by the present invention, the gist thereof is, in the humidity detector having a detection unit for detecting the humidity in a hot and humid atmosphere, the above when not detecting the humidity The humidity detector according to the aspect is provided with an air flow forming means for causing heated air to flow around the detection unit and blowing away the water vapor staying around the detection unit by this flow.

[Action]

Since the humidity detector according to the present invention is configured as described above, the flowing heated air formed by the air flow forming means blows off the water vapor staying around the detection unit. As a result, dew condensation on the surface of the detection unit can be prevented without directly heating the detection unit to a high temperature. Further, since the airflow flows around the detection unit, dehumidification of the detection unit becomes uniform, and when heating, uniform heating is possible.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. The following examples are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention.

Here, FIG. 1 is a side view of a humidity detector according to an embodiment of the present invention in a partially broken state, and FIG. 2 shows an example of operation of an air flow forming means provided in the humidity detector. A time chart, FIG. 3 is a side sectional view of a main part of a humidity detector according to another embodiment of the present invention.

As shown in FIG. 1, the humidity detector according to this embodiment forms a layer of heated air that closely flows around the polymer thin film sensor 1 (detection unit) for detecting the humidity in the steamer, for example. It is configured to have an air flow forming means 4 for

In the air flow forming means 4, around the polymer thin film sensor 1 and the support member 2 supporting the polymer thin film sensor 1,
A pipe 6 made of, for example, Teflon having low heat conductivity and heat resistance is provided through a substantially uniform gap 5. An opening 6a is formed on one end side of the pipe 6, and the other end side is closed. And the pipe 6
A nipple 7 for introducing air into the inside of the pipe 6 is attached to the closed other end side of the pipe.

A pipe from a blower 9 is connected to the nipple 7 via an air heater 8.

In addition, 6b in the figure is a through hole for improving the flow efficiency of the measured vapor.

Therefore, in the humidity detector having the above structure, when the steamer is stopped and humidity is not detected, the blower 9 and the air heater 8 are turned on, and the air from the outside is heated to pass through the nipple 7 and the pipe. 6 is supplied inside.

The heated air supplied to the inside of the pipe 6 flows around the support member 2 and the polymer thin film sensor 1 in a substantially uniform state, and the water vapor staying around the polymer thin film sensor 1 is heated by the heated air. Blown off by the pipe 6 above
Is discharged to the outside through the opening 6a.

As a result, dew condensation on the surface of the polymer thin film sensor 1 can be prevented when the steamer is stopped.

That is, in the humidity detector according to the present invention, the polymer thin film sensor 1 does not have to directly heat the surface of the polymer thin film sensor 1 by controlling the heater 3 as in the conventional device. Condensation on the surface of the polymer thin film sensor 1 can be easily prevented by the air flow formed around the.

Further, in the humidity detector according to the above-described embodiment, heated air is supplied to the pipe 6 (see FIG. 2) before the operation of the steamer and the humidity detection are started, and the cooled polymer thin film sensor 1 is It is desirable to preheat the surface of the polymer thin film sensor 1 so that the high temperature water vapor does not directly hit the surface.

Furthermore, when acidic or alkaline chemicals as color formers are mixed in the vapor, they will be accumulated on the surface of the polymer thin film sensor 1 with dew condensation, and the sensor life will be shortened remarkably due to corrosion. In this case, when the operation is started or stopped and the humidity is not detected, the heated air is supplied to the inside of the pipe 6 to blow off the vapor mixed with the acidic or alkaline chemicals. At this time, if the surface temperature of the polymer thin film sensor 1 is maintained at a high temperature near 100 ° C., a more excellent cleaning effect can be obtained, and high accuracy can be maintained during measurement.

Further, by supplying the heated air into the pipe 6 and flowing it around the polymer thin film sensor 1 even during the operation of the steamer, dust adhered to the surface of the polymer thin film sensor 1 during the humidity detection operation. Can also be blown away and removed. However, the detection data obtained during this removal is not an accurate value because there is a difference between the measurement atmosphere around the polymer thin film sensor 1 and the temperature and humidity inside the steamer.

In a humidity detector according to another embodiment shown in FIG. 3, a guide plate 8 having a substantially frustoconical surface is mounted at a position facing the nipple 7 inside the pipe 6.

Therefore, the heated air supplied from the nipple 7 into the pipe 6 is converted into a swirling flow by flowing along the inclined surface of the guide plate 8, and swirls around the support member 2 and the polymer thin film sensor 1. While flowing in a uniform state.

In the above embodiment, the case where the humidity detector according to the present invention is provided in the steamer used for dyeing and finishing has been described as an example, but the humidity detector is also used in other processes such as a drying process or a humidifying process for foods. It goes without saying that it can also be applied to humidity control in the.

[Advantages of the Invention] The present invention, as described above, in a humidity detector having a detection unit for detecting the humidity in a hot and humid atmosphere,
A humidity detector, characterized in that, when no humidity is detected, heated air is caused to flow around the detection part, and an air flow forming means for blowing away the water vapor staying around the detection part by this flow is provided. Therefore, by blowing off the water vapor by the flow of the heated air, it is possible to prevent the dew condensation on the surface of the detection unit. Therefore, it is not necessary to control the heater to directly heat the surface of the detection unit as in the case of the conventional device. In addition, uniform dehumidification is possible without heating the detection section more than necessary.

[Brief description of drawings]

FIG. 1 is a side view of a humidity detector according to an embodiment of the present invention in a partially broken state, and FIG. 2 is a time chart showing an example of the operation of an air flow forming means provided in the humidity detector,
FIG. 3 is a side sectional view of a main part of a humidity detector according to another embodiment of the present invention, and FIG. 4 is a side view showing a configuration of a conventional humidity detector. [Explanation of reference symbols] 1 ... Polymer thin film sensor (detection unit) 4 ... Air flow forming means, 8 ... Air heater, 9 ... Blower

Claims (1)

[Claims] 1. A humidity detector having a detection unit for detecting the humidity in a hot and humid atmosphere, wherein heated air is caused to flow around the detection unit when humidity is not detected, and this flow causes the surroundings of the detection unit. A humidity detector, characterized in that it is provided with an air flow forming means for blowing away the water vapor accumulated in the air.