JPH0245795Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water absorption preventer that is attached to a front stage of a gas detector, a high concentration meter, etc., to prevent the sensor from being damaged by suction of moisture.

As is well known, when gas is sampled with a gas sampling rod and detected with a gas detector, moisture may be accidentally aspirated. For this reason, a water absorption preventer is installed in front of the gas detector as a means to prevent moisture from flowing into the gas detector.

FIG. 1 is a side cross-sectional view showing an example of a conventional water absorption preventer, in which 1 shows the entire water absorption preventer, 2 is a cylindrical transparent container, and 3 is a container 2 that is filled in a ventilated manner. It is a powdered swelling agent that instantly solidifies uniformly by absorbing water. Reference numeral 4 denotes a sponge-like porous filter provided on both sides of the exterior of the container 2 to suppress the swelling agent 3 from spilling out, and has air permeability and water permeability. Reference numeral 5 denotes lids fixed to both outer sides of the container 2, and the filter 4 is closed by projections 5a.
is holding down. 6 is a ventilation pipe provided in the lid 5.

When installing the gas detector, as shown in FIG. 2, connect the filter 12 side of the sampling rod 11 to the ventilation pipe 6 at one end of the water absorption preventer 1 with a connecting pipe 13.
The inlet 15 of the gas detector 14 is connected to the ventilation pipe 6 on the other end side.
are connected by a connecting pipe 16.

Gas is absorbed from the sampling rod 11 by the operation of a pump (not shown) built into the gas detector 14, dirt, etc. are removed by the filter 12, and the gas passes through the filter 4 of the water absorption preventer 1 shown in FIG. Agent 3
pass through the inside. Then, it passes through the filter 4 on the opposite side again and flows into the gas detector 14 from the suction port 15.

Additionally, if water is accidentally sucked during gas sampling, the swelling agent 3 of the water absorption preventer 1 will instantly solidify due to the suction of water and block ventilation, preventing moisture and gas from flowing into the gas detector 14. is prevented. Thereafter, the sampling rod 11 and filter 12 are washed and dried. Also, replace water absorption preventer 1 with a new one,
Assemble to original shape.

By the way, in the conventional water absorption preventer 1, even if water is sucked into the swelling agent 3, it is difficult to identify the solidified state from the outside of the container 2, so the pump may continue to operate even when ventilation is not possible. This put strain on the pump and caused it to malfunction.

Therefore, in order to prevent this, a water absorption preventer 1 is provided.
This had the disadvantage that inspections had to be carried out from time to time even during use, and work was interrupted for inspections, which was time-consuming.

This invention was made to eliminate the above-mentioned drawbacks. This idea will be explained below.

FIG. 3 is a side sectional view showing an embodiment of this invention, in which 21 shows the entire water absorption preventer, 22 is a cylindrical transparent container, and 23 is placed in the openings on both sides of the container 22. This is the powder layer provided. The powder in the powder layer 23 includes, for example, polyvinyl alcohol, which is a condensation polymer of polyvinyl alcohol and formalin.
We use an acetal-based porous material that is in a contracted state when dry and expands when it absorbs moisture, and has a large water-holding capacity (JyuAron Co., Ltd.: trade name: JyuRapore).

Gelatin powder 24 is filled between the powder layers 23 so as to be air-permeable, and when it absorbs water, it swells and becomes an elastic, uniform gelatin layer. Reference numeral 25 denotes a water-soluble coloring agent embedded in dots on the surface where the one powder layer 23 and the gelatin powder 24 are in contact with each other, and food red is used for good identification. Reference numeral 26 is a lid that closes both sides of the outer periphery of the container 22 by screwing, and a vent hole 27 is formed therein.

When using the conventional water absorption preventer 1 shown in Figure 2,
Instead, the water absorption preventer 21 of this invention is connected.

Further, although the operation is the same as that of the conventional one, when water is sucked in during gas sampling, it enters through the vent 27 on the sampling rod 11 side, is absorbed in a large amount by the powder layer 23, and expands.

The water further dissolves the gelatin powder 24 and turns it into gelatin, thereby blocking the gas flow.

At this time, the red coloring agent 25 is dissolved in water and diffused, and the entire gelatin layer and powder layer 23 are colored red, so that it can be recognized from the outside that water has entered the water absorption preventer 21. The gelatinization of the gelatin powder 24 blocks the gas flow and makes it impossible to suck the gas, so the operation of the pump is stopped and the gas detection work is stopped.

Then, as in the past, the sampling rod 11 and the like are washed and dried, replaced with a new water absorption preventer 21, and the detection work is continued again.

Note that the powder layer 23 on the gas detector 14 side of the water absorption preventer 21 is made longer than the powder layer 23 on the gas sampling rod 11 side to increase the water retention capacity, thereby preventing water from flowing into the gas detector 14. The effect of preventing this can be further improved.

As explained above, this invention has a powder layer made of a powder that has high porosity when dry, expands when water is absorbed, and has a large water-holding capacity in the openings on both sides of a cylindrical transparent container. On the other hand, gelatin powder is filled between both powder layers to allow air to flow, and a water-soluble coloring agent is sealed in the contact surface between one of the powder layers and the gelatin powder. Therefore, even if water is absorbed during gas detection work, it will not flow into the gas detector due to the water retention capacity and expansion of the powder layer, and the gelatin powder will absorb water and gelatinize into a uniform layer. Can completely prevent moisture from passing through.

Furthermore, since the coloring agent diffuses due to the absorption of moisture, the absorption of moisture can be immediately identified from the outside of the container, and gas inspection work can be stopped, which has the advantage of preventing damage to the sensor due to moisture.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional water absorption preventer, Fig. 2 is an explanatory diagram of how the water absorption preventer of Fig. 1 is used, and Fig. 3 is an example of the water absorption preventer of this invention. FIG. In the figure, 21 is a water absorption preventer, 22 is a container, 23 is a powder layer, 24 is gelatin powder, 25 is a coloring agent, 2
6 is a lid, and 27 is a vent.

Claims (1)

[Scope of utility model registration request] A powder layer made of powder that has a high porosity when dry, expands when absorbed, and has a large water-holding capacity is placed in the openings on both sides of a cylindrical transparent container to provide air permeability. A water absorption preventer characterized in that gelatin powder is filled in the space between the two powder layers, and a water-soluble coloring agent is further encapsulated in the contact surface between the one powder layer and the gelatin powder. .