JPS642220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a humidity sensing device for detecting and measuring humidity in an atmosphere.

Technical Background of the Invention Humidity sensing devices detect atmospheric humidity, for example, and devices that apply various principles are known, but humidity sensors that utilize changes in electrical impedance are small, robust, and easy to handle. Air conditioning equipment, etc.
Used to control microwave ovens and other devices.

For example, in the past, Utility Model No. 55-106857 and
As described in Publication No. 56-58553, the humidity sensor element was shielded with a permeable membrane or porous material to prevent oil, dust, and condensation from adhering to the humidity sensor, and to eliminate the effects of wind speed, wind direction, etc. Therefore, the air surrounding the humidity sensing unit may stagnate and the fluctuating humidity of the room may not be detected quickly. In addition, the humidity sensor has a humidity sensing portion within a few millimeters in size, and the atmosphere it comes into contact with is very localized, so there is a risk that the humidity of the atmosphere cannot be quickly determined.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and provides a humidity sensing device that can detect humidity quickly and accurately.

Summary of the Invention That is, the present invention provides a humidity sensor comprising a humidity sensing part from which an electrical lead wire is drawn out, and an envelope housing the humidity sensing part inside and having ventilation walls facing both sides of the humidity sensing part. and a vibration generator that is integrally attached to the humidity sensor and applies vibration in a direction perpendicular to the ventilation wall.

The envelope has a ventilation wall placed opposite the humidity sensing part to allow air from outside the envelope to flow inside, but the vibration from the vibration generator is transmitted in a direction perpendicular to the ventilation wall. This facilitates the flow of air into the envelope, increasing circulation of air inside and outside the envelope. This prevents air from stagnation inside the envelope and enables a quick response to humidity fluctuations.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In Fig. 1, the humidity sensor 1 has its envelope 1.
0 is formed by a mold made of resin such as epoxy, aluminum, etc., and houses a moisture sensing section 11 inside. On both sides of the envelope 10, ventilation walls 12, that is, a mesh having a large number of ventilation holes with a diameter of several tens of micrometers, are arranged opposite to both sides of the moisture sensing section 11, so that the inside and outside of the envelope 10 are vented to air. Allows for circulation. Two electrical lead wires 13 and 14 extend from the humidity sensing section 11 to the outside through the wall surface of the envelope 10. The envelope mounting portion 15 is located on the opposite side of the lead wire to the envelope 10.
It has been extended as one. A mounting hole 17 is provided at the tip 16 of the envelope mounting portion 15, and the envelope mounting portion 15 can be mounted arbitrarily to a wall surface of a device or an air-conditioned room. Now,
The outer case mounting part 1 between this mounting hole 17 and the outer case 10
On the fifth side, an ultrasonic vibrator is provided as a vibration generator 18 that applies vibration in the perpendicular direction to the ventilation wall 12. It may be any suitable electrostrictive or magnetostrictive material, producing minute vibrations at, for example, 20 kHz. code 1
9 and 20 indicate lead wires for power supply. This vibration is transmitted to the envelope 10 and vibrates the envelope 10, but since the direction of vibration is perpendicular to the ventilation wall 12, it disturbs the surrounding atmosphere and causes the atmosphere inside and outside the envelope to vibrate. Forces circulation through the air and eliminates stagnation of air inside the envelope. In this example (vibration 20 kHz), it took 20 seconds to replace the atmosphere in the space of the envelope 10 housing the humidity sensing section 11, but this was done under the same conditions except that the vibration direction was parallel to the ventilation wall. In the comparative example, it took 43 seconds. As for the vibration frequency, ultrasonic waves produce an effect with minute energy, but even audible frequencies can be used with vibrations within a level that does not cause harshness. Continuous vibration or pulsed vibration may be used, and the constant vibration is continued. According to this embodiment, since the vibrator is integrated into the envelope, it is easy to apply vibrations and the envelope can be made compact.

Furthermore, even if the vibrator is incorporated into the envelope together with the humidity sensor, the same operation can be achieved.

FIG. 2 shows another embodiment. The humidity center 21 has a humidity sensing section 25 disposed within an envelope 24 having ventilation walls 22 and 23 on opposing sides. This sensor 21 is mounted on a vibration device 26, and is fixed to a wall surface of a device or the like via this vibration device.
The vibration device 26 vibrates the humidity sensor 2 at an appropriate frequency in the direction facing the ventilation wall of the humidity sensor 21 (indicated by the arrow in the figure).
Vibrate 1. As a result, the ventilation wall 2
2 and 23, the air is forced to flow inside and outside the envelope 24, making it possible to improve the responsiveness of detecting the fluctuating atmospheric humidity. The effect can also be obtained by replacing the vibration device with a large part of the vibration of an attached device, such as a cooler.

Effects of the Invention As described above, the present invention combines a humidity sensor with a vibration generator and vibrates the humidity sensor in a direction perpendicular to the ventilation wall of the humidity sensor, thereby forcing air to flow inside and outside the envelope. Because of this, it is possible to detect humidity with improved response, which has a significant effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is a schematic diagram showing another embodiment of the invention. 1... Humidity sensor, 10... Envelope, 11...
Moisture sensing section, 12...Ventilation wall, 13, 14...Electricity lead wire, 18...Vibration generator.

Claims (1)

[Claims] 1. A humidity sensor consisting of a humidity sensing part from which an electrical lead wire is drawn out, an envelope that houses the humidity sensing part inside and has ventilation walls facing both sides of the humidity sensing part; a vibration generator that is attached to the ventilation wall and applies vibration in a direction perpendicular to the ventilation wall.