JP2578996Y2 - Wick device for self-cleaning wet bulb temperature sensor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wick device provided in a wet bulb temperature sensor for measuring humidity, such as a general thermometer such as an alcohol thermometer, or a thermocouple temperature sensor, and more particularly, to a wick device attached to a temperature sensor. The present invention relates to a self-cleaning wick device designed so that impurities such as underwater impurities and microorganisms do not accumulate on a wick for a wet bulb temperature sensor.

[0002]

2. Description of the Related Art A wick device provided in a wet-bulb temperature sensor for measuring humidity usually has a wick surrounding a temperature-sensitive part of the sensor, and a part of the wick is immersed in a water supply pan to absorb water therefrom. And evaporate from the wick. Due to this water evaporation, the temperature indicated by the wet bulb temperature sensor becomes lower than the ambient atmosphere temperature. And, generally, this wet bulb temperature,
The relative humidity is obtained from the dry-bulb temperature separately measured by the dry-bulb temperature sensor.

[0003] In this case, dirt in the surrounding atmosphere, impurities contained in water, and proliferating microorganisms and the like easily accumulate on the wick. Such sediment changes the moisture content of the wick, and if the sediment is salty, the equilibrium vapor pressure fluctuates and changes the amount of water evaporation. Occurs. So, for example,
Japanese Patent No. 16676 teaches a self-cleaning wick device capable of suppressing such accumulation of dirt. The self-cleaning wick device covers a horizontal rod-shaped wet bulb temperature sensor and has both ends extending downward. One end (water absorption part) enters the water supply pan, and the other end (drainage part) enters the drain pan. Water is stored in the water supply pan in a state of maintaining a constant water level, and the water is sucked up into the water suction part by a capillary phenomenon. In the wick, water flows around the temperature sensing part of the wet bulb temperature sensor and is discharged from the drainage part to the drainage pan.

[0004] By constantly flowing water in the wick, the entire wick is maintained in a wet state, and contaminants in the wick are washed away to some extent. Specifically, dirt adhering to the temperature sensor when the wet bulb wick is attached can be washed out to a certain extent, and dirt in the surrounding atmosphere, impurities contained in water, and microorganisms growing in the water accumulate in the wick. Can be prevented to some extent.

[0005]

However, according to the structure of the conventional self-cleaning wick device, the wick portion surrounding the temperature sensing portion (temperature detecting portion) of the temperature sensor is wrapped around the portion other than the temperature sensing portion. The part is located on the downstream side in the water flow direction, and the water flowing in from the water absorption part of the wick flows through the wick part wrapping the part other than the temperature sensing part, and then flows into the wick part wrapping the temperature sensing part. And then discharged to the outside through the drainage section.

Therefore, even in this conventional apparatus, there is a problem that the contaminants flowing in together with the water are deposited on the downstream portion of the wick and are easily located around the sensor temperature sensing portion. As described above, such sediment changes the moisture content of the wick, and when the sediment is salt, the equilibrium vapor pressure is changed to change the amount of water evaporation. An error occurs in the measured value of the warm part.

[0007] Accordingly, the present invention further suppresses the accumulation of contaminants in the wick portion surrounding the temperature-sensitive part of the wet bulb temperature sensor, as compared with the conventional wick device for a self-cleaning wet bulb temperature sensor. It is an object of the present invention to provide a wick device for a self-cleaning wet bulb temperature sensor having a long life and capable of contributing to temperature measurement.

[0008]

According to the present invention, there is provided a wick device for solving the above-mentioned problems, comprising: a first portion covering a temperature sensing portion of a wet bulb temperature sensor; A wet-bulb temperature sensor having a downward U-shape as a whole, including a second portion continuous from the first portion, a water absorbing portion continuous downward from the first portion, and a drainage portion continuous downward from the second portion. A wick, a water supply pan for immersing the water-absorbing portion of the wick, and a drainage pan for receiving water from the drainage portion of the wick, the lower end of the drainage portion being located below a water surface position in the water supply pan. Is reached.

[0009] The second wick of the wick for the wet bulb temperature sensor
The portion may be provided with a dirt reservoir continuously projecting therefrom.
Further, when the wick device according to the present invention is provided for a wet bulb temperature sensor disposed in a test room of an environmental test device such as a thermo-hygrostat, for example, the temperature sensing part of the temperature sensor is provided in the test room. Since the water supply pan is usually disposed in the test chamber from the wall, a water supply tank for supplying water to the water supply pan is provided between the drain pan so that water can be easily supplied from outside the test chamber to the water supply pan. The water supply tank and the water supply pan may be installed at a position opposite to the pan, and the water supply tank and the water supply pan may be connected by a water communication unit.

[0010]

According to the wick device of the present invention, the water absorbed by the water-absorbing portion of the wet-bulb temperature sensor wick from the water supply pan by capillary action covers the sensor temperature sensing portion.
The liquid flows into the second part outside the temperature sensing part via the part. When the dirt reservoir is continuously formed in the second portion, water flows into this portion further. The water that has flowed into the second part also flows into the drainage part, and is discharged to the drain pan together with much of the contaminants.

In any case, since water hardly stays in the wick portion (first portion) surrounding the temperature sensing portion, the accumulation of contaminants in this portion is further suppressed as compared with the related art. When a dirt reservoir is continuously formed in the second portion of the wick, water flows into this portion as well, and contaminants are deposited and held there.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of one embodiment shown together with a wet bulb temperature sensor. In the wick device of FIG. 1, a rod-shaped wet bulb temperature sensor 1 composed of a thermocouple is disposed substantially horizontally, and a wick 2 is provided around the sensor 1 in a tightly contacting state. The sensor 1 is provided with a temperature sensing part 3 for actually detecting the temperature at the distal end. And a non-thermosensitive part surrounding part 5 surrounding the part. Wick 2
A water absorbing portion 6 extending downward from the temperature sensing portion surrounding portion 4;
The non-thermosensitive portion surrounding portion 5 includes a drain portion 7 extending downward from an end opposite to the portion 4, and a dirt reservoir 8 projecting upward from the portion 5 opposite to the drain portion 7. I have.
These main parts of the wick 2 are continuously formed of the same material, and have a downward U-shape as a whole.

A water supply pan 10 is arranged below the water absorbing portion 6. Water W is stored in the pan 10 at a constant water level, and the lower end of the water absorbing portion 6 is immersed in the water W. The water supply pan 10 is provided with a water inlet 11 at the bottom thereof.
It communicates with a water supply tank 13 via a water supply passage 12 which communicates with the water supply tank 1. The water W is stored in the water supply tank 13 in a state where a predetermined water level is always maintained. This water level is 10
Therefore, only the lower part of the water absorbing portion 6 can be maintained in the state of being constantly immersed in the water W. Water supply tank 13
In order to keep the water level constant at all times, a float 15 is arranged in the water supply tank 13, and at the upper end of the water supply tank 13, an outlet of a water supply pipe 16 connected to a water absorption source (not shown) is opened. ing. The upper end of the float 15 is the water supply pipe 1.
6 is configured to open and close the outlet of the water supply tank 13. When the water level of the water supply tank 13 decreases and the float 15 moves downward, the float 15 opens the outlet of the water supply pipe 16 to supply water to the water supply tank 13. Tolerate.

A drain pan 20 is provided below the drain part 7, and a bottom opening of the drain pan 20 is connected to a drain (not shown) through a drain passage 21. Wick 2
The lower end of the drain portion 7 is located in the drain pan 20 and located below the water surface in the water supply pan 10. According to this wick device, the water W in the water supply pan 10 is sucked up by the water absorbing portion 6 by capillary action, flows from the water absorbing portion 6 through the temperature sensing portion surrounding portion 4 and reaches the non-temperature sensing portion surrounding portion 5,
The water is discharged from the portion 5 to the drain pan 20 through the drain portion 7.

When contaminants such as dust and microorganisms are mixed in the water W in the bread 10, the contaminants enter the wick 2 together with the water W and reach the temperature sensing part surrounding portion 4. Is wick 2 in the direction of water flow in the wick.
It is located upstream of the whole, so that a sufficient amount of water flows toward the non-thermosensitive area surrounding portion 5, so that the accumulation of contaminants in the portion 4 is suppressed for a long time, and the life of the wick 2 is reduced. Becomes longer.

On the other hand, there is a possibility that contaminants may accumulate on the portion 5 located on the downstream side of the entire wick 2, but even if such accumulation occurs, the portion 5 is located outside the temperature sensing portion 3 of the sensor 1. Since the portion is wrapped, an error in the measurement accuracy of the sensor 1 is suppressed for a long time. Further, since only the lower end of the dirt reservoir 8 above the part 5 is connected to the other part (part 5), water easily stays there. Therefore, the contaminants can be concentrated and efficiently collected in the portion 8.

The present invention is not limited to the above embodiment, but can be implemented in various other ways. For example, the dirt reservoir 8
Can be omitted. In addition, the water supply passage 12 connecting the water supply tank 13 and the water supply pan 10 may be formed integrally with the bottom of the water supply pan 10 and the drainage pan 20. The overall size may be reduced by penetrating the passage 12 or the like.

[0018]

[Effects of the Invention] As described above, according to the present invention, compared with the conventional wick device for a self-cleaning wet bulb temperature sensor,
It is possible to provide a wick device for a self-cleaning type wet-bulb temperature sensor that has a long life and can contribute to wet-bulb temperature measurement for a long time by further suppressing the accumulation of contaminants in the wick portion surrounding the temperature-sensitive part of the wet-bulb temperature sensor. .

If the wick is provided with a dirt reservoir, contaminants can be deposited and held there. In the wick device of the present invention, when a water supply tank for supplying water to the water supply pan is installed at a position opposite to the water supply pan with the drainage pan interposed, and the water supply tank and the water supply pan are connected by a water communication part. Can be easily applied to environmental test equipment and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sensor 2 ... Wick 3 ... Temperature sensing part 4 ... Temperature sensing part surrounding part (1st part) 5 ... Non-temperature sensing part surrounding part (2nd part) 6 ... Water absorption part 7 ... Drainage part 8 ... Dirt storage part 10 ... water supply pan 11 ... water inlet 12 ... water supply passage 13 ... water supply tank 15 ... float 16 ... water supply pipe 20 ... drain pan 21 ... drain passage W ... water

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kayo Kunimoto 3-5-6 Tenjinbashi, Kita-ku, Osaka Taba Ispec, Inc. (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 25 / 00-25/72

Claims (3)

(57) [Scope of request for utility model registration] A first portion covering the temperature sensing portion of the wet bulb temperature sensor, a second portion continuing from the first portion along a portion continuous with the temperature sensing portion of the sensor, and a portion below the first portion. A wick for a wet-bulb temperature sensor having a generally downward U-shape including a water absorbing portion continuous toward the water and a drainage portion continuous downward from the second portion, and a water supply pan for immersing the water absorbing portion of the wick. A drain pan for receiving water from the drain portion of the wick, wherein a lower end of the drain portion has reached a position below a water surface position in the water supply pan, a self-cleaning wet bulb temperature sensor. Wick device. 2. The wick device according to claim 1, wherein a dirt reservoir is continuously provided above the second portion of the wick for a wet bulb temperature sensor. 3. A water supply tank for supplying water to the water supply pan is provided at a position opposite to the water supply pan with the drainage pan interposed therebetween, and the water supply tank and the water supply pan are connected by a water communication part. The wick device according to claim 1 or 2.