JP2009276069A - Gas leak inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas leak inspection device capable of detecting a gas leak in a hands-free manner while walking.
A leaking gas collecting means for collecting a leaking gas G in contact with the ground surface A, and holding the leaking gas collecting means 10 attached to an inspector's footwear S, and leaking the gas collecting means by walking. An attachment 20 that contacts and separates 10 from the ground surface A and a gas detection means 30 that displays the presence or absence of gas collected by the leaked gas collection means 10 are provided.
[Selection] Figure 2

Description

  The present invention relates to a gas leak inspection apparatus used for searching for a gas leak location when a gas leak occurs from a gas pipe buried in the ground, and in particular, a so-called so-called inspector's hands can be used. The present invention relates to a hands-free gas leak inspection apparatus.

  During disasters such as earthquakes, tsunamis, and high waves, city gas pipes buried in the ground may be damaged, and combustible gas may leak, causing a secondary fire disaster. Therefore, it is necessary to quickly grasp the damage situation of the gas pipe at the time of disaster.

Therefore, it is necessary to inspect a wide area in a short time. Conventionally, when an inspector conducts a leak inspection, the inspector as shown in Patent Document 1 holds it in the hand and moves along the conduit drawing. Using a gas detector, cart-type or portable combustible gas detector, etc., this detector is moved to conduct a gas leak inspection.
Japanese Patent Laid-Open No. 11-23403

However, leakage inspection must be performed while holding the above-mentioned inspection apparatus and conduit drawings in hand, which limits the degree of freedom of the inspector's hands and takes time to record and move. is there.
For this reason, at least two inspectors must perform a leak inspection as a group, and therefore it is not possible to perform a leak inspection by widely sharing a wide range of disaster areas. There is a big problem that increases.
Moreover, in the conventional cart type or portable type combustible gas detector, etc., the grounding time must be kept long (for example, about 10 seconds to 15 seconds), and the inspection takes time, and inspection of a wide area is required. There is a problem that it is difficult.

  Accordingly, an object of the present invention is to provide a gas leakage inspection apparatus capable of performing a hands-free detection of gas leakage in a wide range while walking in order to solve such a problem.

The gas leak inspection apparatus according to the present invention has the following characteristics.
(1) A gas leakage inspection device for detecting leakage of gas from a gas pipe buried underground, which has a leakage gas collection means for collecting leakage gas in contact with the ground surface and holding the leakage gas collection means And an attachment that is attached to the inspector's footwear and touches and separates the leaked gas collecting means from the ground surface by walking, and a gas detecting means that displays the presence or absence of gas collected by the leaked gas collecting means. It is characterized by.
According to this gas leak inspection device, the gas inspector only has to attach an attachment to the footwear and walk around the anticipated location of the gas leak. At that time, the gas inspector can hold a map or writing instrument in his hand. Becomes easier and can be inspected alone.

(2) In the gas leakage inspection apparatus according to (1), the leakage gas collecting means includes a reverse funnel-shaped main body having a lower opening and a gas inlet provided inside the main body and above the opening. And a valve body that opens and closes the gas inflow port.
When the inspector walks, the leakage gas collecting means repeats contact and separation with the ground surface together with the attachment, but when the leakage gas collecting means leaves the ground surface, excess air enters the leakage gas collecting means. However, in this gas leakage inspection apparatus, not only a reverse funnel-shaped gas collecting part but also a valve mechanism is provided inside the gas collecting part as a leakage gas collecting means, so that the gas inlet of the partition is opened by the valve body. When (leakage gas collecting means is in a landing state), the leaked gas is sucked from the lower opening of the reverse funnel-shaped body, the leaked gas is introduced into the upper part, and the leaked gas is further introduced into the upper part of the partition part. Can be detected.

On the other hand, when the gas inlet is closed by the valve body (the leakage gas collecting means is away from the ground surface), the intake of excess air is prevented to prevent dilution of the gas, and the introduction is performed as described above. In addition, it is possible to prevent the gas from flowing out downward, and it is possible to increase the inspection accuracy of the gas leakage.
When the leaked gas collecting means lands in the next step, new gas enters the main body and pushes up the previous gas. By repeating this, when the gas reaches the gas detecting means, the gas leak is notified. Go back a few steps and research the area over time.

(3) In the gas leakage inspection apparatus according to (1), the valve body slides in the main body, contacts and separates from the gas inlet, and opens and closes the gas inlet; The upper end is connected to the valve plate, passes through the gas inlet, and when the attachment contacts the ground surface, the lower end contacts the ground surface, the valve plate opens the gas inlet and opens the gas inlet. A valve shaft that allows inflow and has a lower end projecting from the lower opening when the attachment is separated from the ground surface and the valve plate closes the gas inlet.
According to this gas leak inspection apparatus, when the lower opening of the main body is in contact with the ground surface, the lower end of the valve shaft is pressed upward by the ground surface to open the gas inlet, and there is a leaked gas. Introduces the gas into the main body, and when the main body is separated from the ground surface and the lower end of the valve shaft is separated from the ground surface, the valve body automatically closes the gas inlet and removes excess air into the main body. Since the inflow is blocked and the outflow of the suction gas is blocked, the inspection accuracy can be improved.

According to the gas leak inspection apparatus according to the present invention, the inspector can attach the attachment to the footwear (shoes) and walk in the expected gas leak area, and can perform the inspection work with the map or recording paper in hand. The work burden on the workers can be reduced, and a wide range of inspections can be performed independently, which can be effectively used to prevent secondary disasters.
In addition, as a leakage gas collecting means, not only a reverse funnel-shaped gas collecting part, but also a valve mechanism is provided therein, so when the gas inlet of the partition part is opened by the valve body, the partition part When the gas inlet is closed by the valve body, the leaked gas can be detected further upward, and the introduced gas is prevented from flowing out downward and the excess air is sucked in. It can be prevented to prevent gas dilution, and the accuracy of gas leakage inspection can be increased.

  Next, an embodiment of a gas leak inspection apparatus according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is a plan view of the gas leakage inspection apparatus according to the first embodiment, FIG. 2 is a front view of the gas leakage inspection apparatus, and FIG. 3 is a side view.

  A first embodiment of a gas leakage inspection apparatus according to the present invention will be described. As shown in FIGS. 1 to 3, the gas leak inspection apparatus 1 holds a leak gas collecting means 10 that contacts the ground surface A and collects leak gas, and a leak gas collection means 10. Attached to the surface of the ground surface A by the inspector's walking, and the presence or absence of the gas G collected by the leaked gas collecting means 10 connected to the leaked gas collecting means 10 Gas detection means 30 for displaying.

As shown in FIGS. 4 and 5, the leaked gas collecting means 10 is provided on a main body leg 11 made of MC nylon formed in a reverse funnel shape having a lower opening 101 and an upper part of the main body leg 11. A cylindrical partition portion 13 having a gas inlet 131 formed at the upper end, an MC nylon main body upper portion 12 screwed into the partition portion 13, and a valve body 15 for opening and closing the gas inlet 131. I have.
The main body leg portion 11 is provided with a lower opening 101 at the lower end and is a reverse funnel-like shape rising upward from the lower opening 101 in a conical shape. The periphery of the lower opening 101 is a bolt for attaching to an attachment 21 described later. A leg portion 11a having a plurality of holes is formed.

  The partition 13 has a cylindrical shape with a lower end connected to or integrally formed with the upper end of the main body leg 11 and provided with a gas inlet 131 having a valve seat function formed on a substantially 45 ° inclined surface at the upper end. The lower chamber 103 inside the main body leg portion 11 and the upper chamber 105 inside the main body upper portion 12 are partitioned. Then, a male screw is cut on the outer peripheral surface of the partition portion 13 and screwed into a female screw cut on the lower portion of the inner wall 12a of the main body upper portion 12 so that the main body leg portion 11 and the main body upper portion 12 are connected. .

The upper part 12 of the main body has a recess 12b in which the lower part of the inner wall 12a is screwed into the partitioning part 13, an upper end of a coil spring 17 described later is inserted into the upper part, and a communication port in which the connecting pipe 11c is screwed into the upper end of the recess 12b 12c is provided.
And the coil spring 17 is inserted between the recessed part 12b and the valve plate 151, and the valve body 15 is always urging | biasing in the direction which closes the said gas inflow port 131. FIG.

  The valve body 15 is chamfered around the disk-shaped lower surface that contacts and separates from the gas inlet 131 and opens and closes the gas inlet 131, and the outer periphery slides on the inner wall 12a of the main body upper portion 12. The valve plate 151 and the upper end are connected to the lower surface of the valve plate 151, penetrate the partition 13, and when the main body 111 contacts the ground surface A, the lower end contacts the ground surface A, and the valve plate 151 The gas inlet 131 is opened to allow the upper chamber 105 and the lower chamber 103 to communicate with each other to allow the gas G to flow in. When the main body 111 is separated from the ground surface A, the lower end protrudes from the lower opening 101 and the valve plate 151. Includes a valve shaft 153 that closes the gas inlet 131 and shuts off the upper chamber 105 and the lower chamber 103.

  Next, the attachment 20 includes a flat base plate 21 having an area on which the inspector's footwear S is placed, and two elongated holes 22a, 22b, 23a, and 23b provided in a pair of left and right before and after the base plate 21. , Each of which is provided with a front band 25 for fastening the front upper part of the inspector's footwear S to the base plate 21 and a rear band 26 for fastening the front side of the ankle.

  The base plate 21 is made of a lightweight and strong material such as a thick plate of MC nylon, and an opening 201 having the same diameter as the lower opening 101 of the main body leg 11 is provided on either the left or right side. A plurality of countersunk holes corresponding to the bolt holes provided in the leg portions 11a of the main body leg portion 11 are provided around the periphery from the lower surface to the upper surface.

  The front band 25 is a band in which connecting means such as a pair of magic fasteners (trade names) are attached to both ends. One end of the front band 25 is inserted from the outer long hole 22a of the base plate 21 toward the lower surface. 22a from the upper surface to the upper inner hole 22b on the opposite side, inserted downward and wound from the outer long hole 22b to the upper surface. It is possible to do. The rear band 26 is the same as the front band 25. Note that the thin plate portion formed by adjoining the pair of long holes 22 and 23 provided in the base plate 21 is formed such that the lower surface is made thinner by the thickness of the bands 25 and 26. Is not in direct contact with the ground surface A.

  Next, if the gas detection means 30 is connected to the connection pipe 111 of the leaked gas collecting means 10 by the connection pipe 31 and indicates the presence or absence of leaked gas and its concentration at the hand of the inspector, it is conventional. The combustible gas detector can be used.

  Next, the operation of the gas leakage inspection apparatus 1 configured as described above will be described. As shown in FIG. 3, the inspector places the footwear S on the base plate 21 of the attachment 20 and fastens the footwear S with the bands 25 and 26. And as shown in the conceptual diagram which shows the use condition of FIG. 6, hold | maintain the gas detection means 30 connected to the leakage gas collection means 10, and walk in a gas leak estimated area.

As the inspector walks, when the valve shaft 153 of the leaked gas collecting means 10 comes into contact with the ground surface A, the lower end of the valve shaft 153 is grounded with the lower opening 101 and the opening 201 as shown in FIG. The valve body 15 slides upward against the urging force of the coil spring 17, the valve plate 151 opens the gas inlet 131, and the upper chamber 105 and the lower chamber 103 communicate with each other. .
Then, the interior of the main body 111 becomes a closed chamber by the ground surface A, the lower chamber 103, and the upper chamber 105. If the gas G leaks, the gas G is lighter than air, as indicated by the dotted line. G enters the upper chamber 105 from the lower chamber 103 through the gas inlet 131, and is further introduced from the connection pipe 11c through the connection pipe 31 into the gas detection means 30.

Next, when the valve shaft 153 of the leakage gas collecting means 10 is separated from the ground surface A as the inspector walks, the valve body 15 is moved downward by the biasing force of the coil spring 17 as shown in FIG. The valve plate 151 closes the gas inlet 131 and shuts off the upper chamber 105 and the lower chamber 103.
Then, since the upper chamber 105 and the lower chamber 103 are shut off, the air contained in the lower chamber 103 does not enter the upper chamber 105, and the leakage gas G contained in the upper chamber 105 is excessive. It is possible to detect leaked gas with high accuracy without being diluted by fresh air.
At this time, the lower end of the valve shaft 153 protrudes downward from the opening hole 201 of the attachment 20 to prepare for the next walk.

  When the valve shaft 153 of the leaking gas collecting means 10 is landed in the next step, the valve plate 151 opens the gas inlet 131 again, and new gas G or air enters the main body 111 and pushes up the previous gas G. By repeating this, the gas G is successively introduced into the gas detection means 30, and when the gas G reaches the gas detection means 30, it is displayed that there is a gas leak and informs the inspector. The inspector goes back a few steps to investigate the area over time, plots the location on a map, and contacts the construction department to carry out appropriate gas leak prevention work.

  Thus, according to the gas leak inspection apparatus 1 of the present embodiment, the leak gas collecting means 10 that contacts the ground surface A and collects the leak gas G, the leak gas collecting means 10 are held, and the inspector An attachment 20 that is attached to the footwear S and that makes the leakage gas collection means 10 contact and separate from the ground surface A by walking, and a gas detection means 30 that displays the presence or absence of gas collected by the leakage gas collection means 10. As a result, the inspector can detect the gas leak simply by tightening the footwear S on the attachment 20 and walking in the expected gas leak area, making it hands-free and enabling a gas leak test while holding a map or recording paper. A wide range of inspections became possible by itself.

  Further, by providing a valve mechanism inside the leakage gas collecting means 10, the leakage gas G is sucked from the lower opening 101 of the reverse funnel-shaped main body 111, and the leakage gas G is introduced into the upper portion of the inside, thereby separating the partition When the gas inlet 131 of the thirteen is opened by the valve body 15, it is possible to detect by introducing the leaked gas G further above the partition part 13, while the gas inlet 131 is closed by the valve body 15. When this is done, it is possible to prevent the introduced gas G from flowing out downward, and to prevent the intake of excess air. In the next step, the valve body 15 is pushed up again to open the gas inlet 131. Opening and introducing the gas G and repeating this makes the gas G reach the gas detection means 30, so that the inspector can inspect independently, and the inspection accuracy and inspection efficiency of gas leakage can be improved. .

Next, a second embodiment of the gas leakage inspection apparatus according to the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
As shown in FIGS. 7 to 9, the gas leakage inspection device 4 holds the leakage gas collecting means 50 that contacts the ground surface A and collects the leakage gas, and holds the leakage gas collection means 50, and the footwear of the inspector An attachment 60 that is attached to S and that contacts and separates the leaked gas collecting means 50 from the ground surface A by an inspector's walking, and is connected to the leaked gas collecting means 50, and the gas G collected by the leaked gas collecting means 50 Gas detection means 30 for displaying the presence or absence.

As shown in FIGS. 10 and 11, the leak gas collecting means 50 is provided with a reverse funnel-shaped main body 51 having a lower opening 501, a gas inlet 531 provided above the lower opening 501, and provided inside the main body 51. And a valve body 55 that opens and closes the gas inflow port 531.
The main body 51 is provided with a lower opening 501 at the lower end and is a reverse funnel-like shape rising upward from the lower opening 501 in a conical shape. The upper end is connected to the gas detection means 30 via the connection pipe 31. A small diameter connecting pipe 511 is provided.

  A partition 53 is provided above the lower opening 501 inside the main body 51 so as to partition the main body 51 into an upper chamber 505 and a lower chamber 503. As shown in FIG. 12, a sliding hole 535 that enables a valve shaft 553 of a valve body 55 described later to slide up and down, and a waveform or A gas inflow port 531 that extends in a star shape on the outer periphery and is opened and closed by sliding the valve body 55 up and down is provided.

  The valve body 55 is attached to and separated from the gas inlet 531, a disc-shaped valve plate 551 that opens and closes the gas inlet 531, and an upper end attached to the lower surface of the valve plate 551. When the main body 51 contacts the ground surface A, the lower end contacts the ground surface A, the valve plate 551 opens the gas inlet 531, and the upper chamber 505 and the lower chamber 503 The lower end protrudes from the lower opening 501 when the main body 51 is separated from the ground surface A, and the valve plate 551 closes the gas inflow port 531 so that the upper chamber 505 and the lower chamber are closed. 503 and a sliding shaft 553 that shuts off 503.

The valve plate 551 is a thick disk-shaped one having an outer diameter larger than the maximum diameter of the corrugated gas inlet 531. The valve shaft 553 attached to the lower surface of the valve plate 551 has a rod shape with a lower end protruding from the lower opening 501 when the valve plate 551 contacts the upper surface of the partition plate 53 and closes the gas inlet 531. belongs to.
A washer 555 is fixed at a predetermined position between the lower end of the valve shaft 553 and the lower surface of the valve plate 551.
A coil spring 17 is inserted between the lower surface of the partition portion 53 and the washer 555 around the valve shaft 553, and the valve body 55 always urges the gas inlet 531 in a closing direction.

  Next, the attachment 60 includes a flat base plate 61 having an area on which the inspector's footwear S is placed, a protector 63 attached to the lower surface of the base plate 61 and stepping on the ground surface A, and an upper surface of the base plate 61. A front band 65 that is attached and fastens the front upper part of the inspector's footwear S to the base plate 61, a middle band 66 that fastens the front side of the ankle, and a rear band 67 that fastens the heel side.

The base plate 61 is formed of a lightweight and strong material such as an aluminum thick plate, for example, and an inclined surface 601 is formed on either the left or right side, and a substantially horizontal mounting surface following the inclined surface 601. 603 is formed.
A semicircular cutout 605 is formed at the center of the mounting surface 603 in the front-rear direction, and the main body 51 of the leakage gas collecting means 50 described above is attached to the cutout 605 with a suitable connecting means via a cushion material or the like. ing.
The mounting height of the main body 51 to the base plate 61 is a height at which the lower openings 501 of the main body 51 are grounded substantially simultaneously when the protector 63 is grounded to the ground surface.

The protector 63 is a substantially rectangular shape that is formed of a material such as hard rubber that can support the weight of the inspector and that serves as a cushion when the inspector walks. In this embodiment, the base 63 Four pieces are attached to the lower surface of the plate 61 on the front, rear, left and right.
Therefore, when the protector 63 is compressed by the weight of the inspector or when the ground surface is inclined and there is a slight difference or inclination in the height between the base plate 61 and the main body 51, this difference is absorbed. Therefore, as described above, it is desirable to attach the base plate 61 and the main body 51 via a cushion material.

  The front, middle, and rear bands 65, 66, and 67 are divided into left and right parts in the middle. Each end is fixed to the base plate 61 by caulking or the like, and a magic fastener (trade name) or the like is attached to the free end. A connecting means is attached, and the footwear S can be fastened with the left and right bands after being placed.

Next, the gas detection means 30 is the same as that of the first embodiment.
The operation of the gas leakage inspection apparatus 4 of the second embodiment is also the same as that of the first embodiment.
Therefore, the same effect as that of the first embodiment can be obtained.

In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the attachment is a flat plate and the footwear is placed and the leakage gas collecting means is attached to the attachment. However, the present invention is not limited to this, and for example, the leakage gas collecting means is directly attached to the boots. It is also possible to make it. In short, any structure may be used as long as it is possible to walk with the leak gas collecting means attached to the footwear.
Further, although the leak gas collecting means and the attachment have been described with MC nylon molded, it may be made of metal such as stainless steel.

It is a top view of the gas leak inspection apparatus concerning a 1st embodiment of the present invention. It is a front view of the gas leak inspection apparatus concerning a 1st embodiment of the present invention. It is a side view of the gas leak inspection apparatus concerning a 1st embodiment of the present invention. It is sectional drawing of the state which the leaked gas collection means of the gas leak test | inspection apparatus concerning the 1st Embodiment of this invention landed. It is sectional drawing of the state from which the leak gas collection means left | separated from the ground surface of the gas leak inspection apparatus which concerns on the 1st Embodiment of this invention. It is a conceptual diagram of the state which uses the gas leak test | inspection apparatus which concerns on the 1st Embodiment of this invention. It is a top view of the gas leakage inspection apparatus which concerns on the 2nd Embodiment of this invention. It is a front view of the gas leakage inspection apparatus which concerns on the 2nd Embodiment of this invention. It is a side view of the gas leakage inspection apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the state which the leak gas collection means landed of the gas leak test | inspection apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the state from which the leakage gas collection means left | separated from the ground surface of the gas leakage inspection apparatus which concerns on the 2nd Embodiment of this invention. It is a top view of the gas inflow port of the gas leak inspection apparatus concerning a 2nd embodiment of the present invention.

Explanation of symbols

1, 4 Gas leak inspection apparatus 10, 50 Leakage gas collection means 101 Lower opening 111 Main body 11 Main body leg 11a Leg 12 Upper body 12a Inner wall 12b Recess 12c Communication port 11c Connection pipe 13 Partition 131 Gas inlet 15 Valve body 151 Valve plate 153 Valve shaft 17 Coil spring 20 Attachment 201 Opening hole 21 Base plate 25, 26 Band 30 Gas detection means 31 Connection pipe A Ground surface G Leakage gas S Footwear

Claims (3)

A gas leakage inspection device for detecting gas leakage from a gas pipe buried underground,
Leakage gas collecting means for collecting the leaked gas in contact with the ground surface,
An attachment that holds the leaked gas collecting means, is attached to the inspector's footwear, and that walks and separates the leaked gas collecting means from the ground surface;
Gas detecting means for displaying the presence or absence of gas collected by the leaked gas collecting means;
Gas leak inspection device with In the gas leak inspection apparatus according to claim 1,
The leaking gas collecting means includes a reverse funnel-shaped main body having a lower opening,
A partition provided inside the main body and having a gas inlet above the lower opening;
A valve body that slides inside the main body and opens and closes the gas inlet;
A gas leakage inspection apparatus comprising: In the gas leak inspection apparatus according to claim 2,
The valve body slides in the main body, contacts and separates from the gas inlet, and opens and closes the gas inlet;
The upper end is connected to the valve plate, passes through the gas inlet, and when the attachment contacts the ground surface, the lower end contacts the ground surface, the valve plate opens the gas inlet and opens the gas inlet. A valve shaft that allows inflow, the lower end projects from the lower opening when the attachment is separated from the ground surface, and the valve plate closes the gas inlet;
A gas leakage inspection apparatus comprising:

Images