JPH0645248Y2 - Gas detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a gas detector, and more particularly to a structure of an opening portion of a main body case communicating with a gas detection element.

[Conventional technology]

FIG. 4 is a development view showing a conventional gas detector disclosed in, for example, Japanese Utility Model Laid-Open No. 61-69153. In the figure, the sensor part 4 configured by attaching the gas detection element 3 to the tip parts of the two lead wires 2 inserted into the base 1 is repelled in the opening 6 of the main body case 5 communicating with the sensor part 4. The porous filter 7 made of an aqueous material is attached to the sensor unit 4,
In particular, the adhesion of water, dust, etc. to the surface of the gas detection element 3 is prevented.

[Problems to be solved by the device]

However, in the gas detector configured as described above, the sealing property between the porous filter 7 made of a water-repellent material and the main body case 5 is not sufficient, and when the gas detector is immersed in water for use. However, there is a problem that water arrives at the gas detection element 3 and causes a problem. Therefore, it was not possible to wash the gas detector with water after long-term use to remove the foreign matter adhering to the porous filter 7.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to improve the sealing property between the main body case that houses the gas detection element and the filter, and to improve the reliability and reliability of the gas detection element. It is to provide a gas detector having an improved life.

[Means for Solving the Problems]

In the gas detector according to the present invention, at least one opening is provided in a case in which a gas detecting element is housed, and a hydrophobic filter is bonded and arranged on the opening through a bonding material.

[Action]

In the present invention, the detection target gas is transmitted by arranging the hydrophobic filter on the opening so as to be bonded.
The structure is such that water, salt, dust, and other substances that deteriorate the performance of the gas detection element do not enter.

〔Example〕

FIG. 1 is a sectional view of an essential part showing an embodiment of a gas detector according to the present invention, in which the same or corresponding parts as those in the above-mentioned drawings are designated by the same reference numerals. In the figure, openings 6a and 6b are formed on the surface of the main body case 5'in which the sensor unit 4 is housed, which faces the gas detection element 3. A hydrophobic filter 9 to which an adhesive 8 has been applied in advance is arranged so as to adhere so as to close the openings 6a and 6b. The hydrophobic filter 9 of this kind is formed by molding tetrafluoroethylene resin (PTFE) to a thickness of 0.06 to 0.5 mm, for example, polyflon (trade name: manufactured by Toyo Roshi Kaisha, Ltd.), fluoropore (trade name: Sumitomo Electric Industries, Ltd.), ZITEX (trade name: Norton Co., Ltd.), TF filter (trade name: German Man Science Japan Co., Ltd.), etc. are applied. The adhesive 8 is an epoxy adhesive,
A cyanoacrylate-based adhesive, a silicone-based adhesive, a urethane-based adhesive, an ultraviolet curable adhesive, or the like is applied.

The gas detector thus configured is manufactured as follows. That is, as shown in FIGS. 2 and 3, after the gas detection element 3 is attached to the base 1, the base 1
And the main body case 5'formed with the openings 6a, 6b are assembled, and the adhesive 8 is applied to the peripheral portion on the openings 6a, 6b formed in the main body case 5'or the peripheral portion of the hydrophobic filter 9 with an appropriate area. Apply and paste on. After that, the adhesive 8 is cured to complete the process.

With such a configuration, the hydrophobic filter 9 is adhered to the peripheral portions on the openings 6a and 6b of the main body case 5'in which the gas detection element 3 is housed with good sealing property, so that the gas in the main body case 5'is adhered. Only the target detection gas permeates the detection element 3, water, salt, dust, etc., never enter, and the sealing property is secured. Further, since the hydrophobic filter 9 may be adhered only to the peripheral portions on the openings 6a and 6b of the main body case 5 ', workability can be improved. Further, the adhesive 8 is previously attached to the hydrophobic filter 9 or the peripheral portion on the openings 6a and 6b of the main body case 5 '.
By applying the above, it becomes extremely easy to handle the thin hydrophobic filter 9 having a thickness of about 0.06 to 0.5 mm.

In addition, in the above-mentioned embodiment, the case where the tetrafluoroethylene filter is used as the hydrophobic filter 9 has been described, but the present invention is not limited to this, and a polyethylene filter or a polypropylene filter may be used. Of course, the effect of can be obtained.

Further, although the case where the adhesive 8 is used as the bonding material has been described in the above-mentioned embodiments, the present invention is not limited to this, and the same effect can be obtained even if an adhesive is used. Needless to say.

[Effect of device]

As described above, according to the present invention, since the sealing property between the opening of the main body case housing the gas detection element and the hydrophobic filter can be ensured, the reliability and life of the gas detection element can be improved. The extremely excellent effect of is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a gas detector according to the present invention, FIGS. 2 and 3 are development views for explaining a method of manufacturing the gas detector according to the present invention, and FIG. It is a development view showing a gas detector. 1 ... Base, 2 ... Lead wire, 3 ... Gas detection element,
4 ... Sensor part, 5 '... main body case, 6a, 6b ... opening, 8 ... adhesive, 9 ... hydrophobic filter.

Claims (1)

[Scope of utility model registration request] 1. A gas detecting element, a base into which a lead wire electrically connected to the gas detecting element is inserted, an opening is formed in a surface facing the gas detecting element, and the gas detecting element is provided. A main body case fitted to the base so as to surround it; and a hydrophobic filter in which a bonding material is applied in advance on the bonding surface side and is bonded and arranged on the outer surface of the opening of the main body case with the bonding material. A gas detector characterized in that