JPH1164185A - Gas detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas detector which can safely and easily detect a gas requiring neither a ladder nor a stepladder in the case where the detection site is high or in a manhole nor slipping under the floor or to the back side of an obstacle in the case where the detection site is under the floor or the back side of an obstacle. SOLUTION: In this gas detector which comprises a main body containing a gas sensor and a gas detection mechanism including a gas suction means and a gas sampling nozzle 20 connected with the gas suction means, the length of the pipe-like gas sampling nozzle 20 is made changeable. The tip side part of the gas sampling nozzle 20 formed to be like an expansive and contractive rod antenna is preferably made to be bent at any angle. Moreover, a pipe for extension with optional length or a tube for extension may be installed in the gas sampling nozzle 20 to further extend the length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention may be used on a daily basis for safety management in business establishments handling harmful or flammable gases, or dangerous gases may remain. The present invention relates to a gas detector used for confirming the presence or absence of gas at various work sites.

[0002]

2. Description of the Related Art One example of a conventional gas detector is shown in FIG.
It was shown to. 100 in the figure is a main body of the gas detector, which houses a gas detection mechanism including a gas sensor and a gas suction unit and an alarm mechanism. 101 is a pipe-shaped gas sampling nozzle,
The base end is connected to a connection tube 102 connected to a gas suction port of the main body 100. Gas sampling nozzle 1
01, for example, by bringing the tip opening close to a check point such as a pipe joint of piping in which dangerous gas flows,
If leaked gas is inhaled, an alarm is issued. Although not shown, another type of gas detector has a gas sensor in a case similar to a “hand microphone” in place of the gas sampling nozzle 101, and a detection unit provided at the end of the extension tube 102. Installed.

[0003]

Problems to be Solved by the Invention When the above gas detector is used to inspect, for example, a joint portion of a pipe, the pipe may be installed at a high place, beneath the floor of a building, or be used for various obstacles. They are often installed behind them (Fig. 5,
7). In such a case, the inspection worker prepares a ladder or a stepladder to climb a dangerous high place, or moves under a narrow floor or an obstacle in order to bring the tip of the gas sampling nozzle 101 or the detection unit close to the inspection location. Extra effort and wasted work time, such as sneaking behind. In some cases, it may be necessary to temporarily remove the obstructing floor.

Alternatively, prior to inspection and cleaning of manholes or empty storage tanks containing chemicals or the like, if there is an inspection for the presence or absence of harmful gas (see FIGS. 6 and 8), Inspectors had no choice but to sink directly into dangerous manholes and tanks. In the case of a tank, an accurate inspection result cannot be obtained near the entrance for inspection shown in FIG. 8 because the inside air is easily diluted by the outside air.

Accordingly, an object of the present invention is to invite dangers such as climbing to a high place, dipping under the floor or behind an obstacle, or making useless labor in order to bring the gas sampling nozzle closer to the inspection point. An object of the present invention is to provide a gas detector capable of performing inspection work extremely efficiently without wasting time or wasting time.

[0006]

In order to achieve the above object, a gas detector according to the present invention comprises a main body containing a gas detection mechanism including a gas sensor and gas suction means, and a gas connected to the gas suction means. In the apparatus provided with a sampling nozzle, the pipe-shaped gas sampling nozzle is configured to have a variable length. Then, the tip side portion of the gas sampling nozzle formed in a telescopic rod antenna shape may be bent at an arbitrary angle. Further, an extension pipe or extension tube of an arbitrary length may be attached to the base end side of the gas sampling nozzle so as to be detachably connected to the nozzle so as to further increase the length of the nozzle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The schematic structure of the gas detector of this embodiment is, as shown in FIG. 1, a main body 1 containing a gas detection mechanism including a gas sensor, gas suction means and the like.
0 and the gas sampling nozzle 20 are connected via a connection tube 30.

The gas sampling nozzle 20 has its proximal end connected to the distal end of the handle portion 40 for operation by screwing means. At the base end of the hollow handle portion 40, a connecting tube 3 is provided.
0 are connected.

The main body 10 is a commercially available existing product, and FIG. 4 schematically shows the internal structure thereof. 11 in the figure is a case, 12
Is a connection joint of the connection tube 30, 13 is a gas filter, 14 is a gas sensor, 15 is a gas suction pump,
Reference numeral 15a denotes a gas discharge port, 16 denotes a gas detection circuit, 17 denotes a gas concentration display section, 18 denotes an alarm generation section, and 19 denotes a power supply battery.

The gas sampling nozzle 20 has, for example, a variable length structure similar to a telescopic rod antenna for an automobile. FIG. 1 shows the most contracted state, and FIG. 2 shows the most extended state. Indicated. As shown in FIG. 2, in the gas sampling nozzle 20, a plurality of pipes 20a to 20d having different thicknesses, in this case, four pipes 20a to 20d are connected in a nested manner.
A gas seal and a packing (not shown) serving both as a free stop for expansion and contraction are attached to each connection point.

At the base end of the pipe 20a on the root side, a connecting nut 21 to be screwed to the handle 40 is attached.
A bent portion 22 bent at a predetermined angle is continuously provided at the tip of the most advanced pipe 20d.

FIG. 3 shows an extension pipe 50 provided as an accessory to the gas detector in order to increase the length of the gas sampling nozzle 20. Pipe 20a
At the base end of the extension pipe 50 having substantially the same thickness as
A connection nut 51 for attaching the gas sampling nozzle 20 to the tip of the connection nut 51 is attached.

Next, how to use the gas detector will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1, this gas detector can be used lightly with the same feeling as a conventional gas detector if the gas sampling nozzle 20 is set in the shortest state.

However, as shown in FIG. 5, when inspecting for a gas leak at the joint of the pipe 103 installed at a high place, or as shown in FIG. 6, the bottom of the deep manhole 104 is harmful. When inspecting whether gas is stored or the like, the length of the gas sampling nozzle 20 that can be extended and contracted is appropriately increased according to the height and the depth. In this way, the ladder and the stepladder are prepared as in the past, and the danger of climbing up and down in a high place or a deep hole is released, and extra labor and time can be completely eliminated. .

And, at higher or deeper places,
When it is desired to reach the tip of the gas sampling nozzle 20, an extension pipe 5 is provided between the handle 40 and the gas sampling nozzle 20.
0 may be interposed.

As another use case, as shown in FIG. 7, the inspection of the joint portion of the pipe installed behind the obstacle 105 can be carried out without forcibly turning around behind the obstacle. Easy inspection from gaps. In this case, since the bent portion 22 is provided at the tip of the gas sampling nozzle 20,
Even if there is any obstacle, the tip of the nozzle can be brought close to the inspection location while avoiding it.

Alternatively, as shown in FIG. 8, before checking the empty tank 106 storing the chemicals or the like, it is necessary to check whether or not the dangerous gas is full. Safe and reliable inspection from outside dangerous tanks.

In the above configuration, the object of the present invention is achieved even if the structure of the details is changed as appropriate. For example, when used in a manhole or the like, if an extension tube (not shown) made of a plastic tube or the like is used instead of the extension pipe 50, it can be rolled up and stored, so that the length can be increased arbitrarily. In that case, a pump 15 having a large suction capacity is used, and according to the length of the extension tube,
The ability may be adjusted. Alternatively, the gas filter 13 may be incorporated in the handle 40.

[0019]

As is apparent from the above description, the gas detector according to the present invention has excellent practical effects as listed below. (A) When inspecting a high place or the inside of a manhole, it is not necessary to prepare a ladder, a stepladder or the like as in the related art. (B) Therefore, it is possible not only to save the trouble of preparation, but also to perform safe and quick inspection. (C) Inspection points behind obstacles can be easily inspected without requiring the inspector to work behind them.
The same applies to a case under the floor. (D) Since the bent portion is provided on the tip side of the gas sampling nozzle, the tip of the nozzle can be easily brought close to the inspection point even if there is any obstacle. (E) Very high or deep locations can be inspected very easily by using extension pipes or tubes.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a perspective view of a gas detector in a state where a variable length gas sampling nozzle is contracted.

FIG. 2 is a side view of the gas sampling nozzle in a state where the gas sampling nozzle is elongated.

FIG. 3 is a side view of the extension pipe.

FIG. 4 is a schematic explanatory view of the internal structure of the main body.

FIG. 5 is a diagram showing an inspection state of a pipe installed at a high place according to the embodiment.

FIG. 6 is an explanatory diagram showing an inspection situation in a manhole.

FIG. 7 is an explanatory view showing an inspection state of a pipe behind an obstacle.

FIG. 8 is an explanatory diagram showing an inspection state inside an empty chemical tank;

FIG. 9 is a perspective view of a conventional gas detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body 11 Case 13 Gas filter 14 Gas sensor 15 Pump 20 Gas sampling nozzle 20a-20 Pipe d 21 Connection nut 22 Bending part 30 Connection tube 40 Handle part 50 Extension pipe 51 Connection nut 52 Connection joint 103 Pipe 104 Manhole 105 Obstacle 106 Tank

Claims (3)

[Claims] 1. A gas collecting nozzle comprising a main body containing a gas detection mechanism including a gas sensor and a gas suction means, and a gas sampling nozzle connected to the gas suction means. A gas detector characterized by having a variable length. 2. The gas detector according to claim 1, wherein a tip end portion of the gas sampling nozzle formed in a telescopic rod antenna shape is bent at an arbitrary angle. 3. An extension pipe or extension tube of an arbitrary length for detachably connecting to a base end side of the gas sampling nozzle and further increasing the length of the nozzle. The gas detector according to claim 1 or 2, wherein: