JP7287769B2 - Handy type gas detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a handheld gas detector, and more particularly to a handheld gas detector for detecting gas leakage from leak ports provided in various piping systems.

Handy-type gas detectors are widely used to detect the presence or absence of leakage of common combustible gases such as city gas, liquefied natural gas, and hydrogen from various piping systems. This handheld gas detector is compact, lightweight, and can be operated by hand. A nozzle is usually detachably attached to the suction unit (see, for example, Patent Document 1). On the other hand, in various piping systems, where there is a risk of gas leakage due to deterioration of sealing materials or vibration, for example, piping joints, leak ports are installed so that gas leakage can be easily detected. is provided (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 2003-185609 Japanese Patent Application Laid-Open No. 2007-71351

By utilizing the leak port and using the handheld gas detector, gas leakage from the leak port can be easily detected. However, since the handheld gas detector is operated while holding it by hand, the positional relationship between the leak port and the tip of the nozzle may differ depending on the operator. For this reason, the amount of leaked gas sucked or measured varies depending on the operator, and it was sometimes difficult to identify the location of the leak. At the station, hydrogen cylinders and other filling equipment are stored in a container that can be loaded onto a cargo bed such as a trailer. Since the joints are densely packed in a narrow space, it has been difficult to accurately identify the leak location and accurately detect the leak amount during frequent daily inspections.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a handheld gas detector that can easily and reliably detect the state of gas leakage from a gas leakage detection location such as a leak port.

In order to achieve the above object, the handy gas detector of the present invention is a handy gas detector for detecting a specific component in a gas to be inspected sucked from a gas suction part into a handy gas detector main body, wherein: A gas suction port holding member is provided for holding the gas suction port at a predetermined position with respect to a gas leakage detection point for detecting leakage of the target gas, and gas is suctioned between the gas suction port and the handheld gas detector main body. Further, the gas suction port holding member holds the gas suction port at a predetermined distance and angle with respect to the gas leakage detection location. Characterized by

Further, in the handy type gas detector of the present invention, the gas leakage detection point is a leak port provided in a pipe joint, and the gas suction port holding member is a bolt member or nut constituting the pipe joint. An engaging portion sandwiching two opposing parallel faces of a hexagonal portion formed on the outer surface of a member, the gas suction port opening inside the engaging portion, and between the gas suction port and the leak port. A positioning member for setting the distance is provided, and the engaging portion is provided with a positioning member that abuts on the outer surface of the hexagonal portion in the piping axial direction.

Further, the gas suction port holding member is a tubular member having the gas suction port opened at a tip thereof, and three or more rod-shaped members protrude from the base of the tubular member in the direction of the gas leakage detection location, The gas suction port is arranged at a preset distance from the gas leakage detection point when the tip of each rod-shaped member abuts on the periphery of the gas leakage detection point. Further, the gas suction port holding member is a tubular member having the gas suction port opened at its tip, and at least one auxiliary suction port having an inner diameter smaller than the inner diameter of the gas suction port is provided on the base peripheral wall of the tubular member. The tubular member is formed in a cup shape with a widened tip, and the cup-shaped tubular member has an opening of a gas suction port at the tip provided at the gas leakage detection location. Further, an extension hose for sucking outside air that does not affect the gas to be inspected is provided at the auxiliary suction port. characterized by being connected.

According to the handy type gas detector of the present invention, the gas suction port holding member can keep the distance of the gas suction port from the gas leakage detection point constant, so that accurate measurement can be performed, and when there is gas leakage. can reliably identify the location of the leak. Moreover, since the gas suction port is not blocked, the work can be performed in a stable state. On the other hand, in the case where an auxiliary suction port is provided separately from the gas suction port, even if the gas suction port is blocked, the handy gas detector main body continues to suck gas. It is possible to avoid an abnormal stop by detecting the blockage of the mouth.

1 is a front view showing a first embodiment of a handheld gas detector of the present invention; FIG. FIG. 4 is a cross-sectional side view of a main part showing a second embodiment of the handheld gas detector of the present invention; It is a cross-sectional front view of the main part of the same. FIG. 11 is a front view of a main part showing a third embodiment of the handheld gas detector of the present invention; FIG. 11 is a front view of a main part showing a fourth embodiment of the handheld gas detector of the present invention; FIG. 11 is a front view of a main part showing a fifth embodiment of the handheld gas detector of the present invention; FIG. 11 is a front view of a main part showing a sixth embodiment of the handheld gas detector of the present invention;

FIG. 1 is a front view showing a first embodiment of the handheld gas detector of the present invention. The handy gas detector 11 shown in this embodiment detects a specific component in the gas to be inspected sucked from the gas suction part 12 into the main body 13 of the handy gas detector. A gas suction port holding member 16 for holding a gas suction port 15 at a preset distance from a gas leakage detection point 14 for measuring and detecting presence or absence is provided, and the gas suction port 15 and the handy type gas detector main body are provided. A hose 17 for connecting the gas suction part 12 of 13 is provided.

The handy gas detector 11 can be selected according to the type of specific component to be detected for leakage, and various commercially available handy gas detectors can be appropriately selected and used. A suction pump, a gas sensor, and the like are housed inside the handy-type gas detector main body 13, and the gas to be inspected sucked from the gas suction unit 12 by the suction pump, which is usually the specific component contained in the atmosphere, is detected. He is trying to detect it with the said gas sensor. Furthermore, there is also known a handheld gas detector that indicates the concentration of a specific component in the sampled gas to be inspected. Further, the gas suction unit 12 is usually used with a nozzle attached (see Patent Document 1).

The gas suction port holding member 16 is formed of a tubular member having an appropriate length and diameter. A member 18 is provided. The positioning member 18 defines the distance between the gas leakage detection point 14 and the gas suction port 15 at the time of measurement. In addition to preventing gas leakage, the gas leakage detection point 14 and the gas suction port 15 are brought as close as possible within a range where the gas suction port 15 does not come into contact with the gas leakage detection point 14 and the gas suction port 15 is not blocked. Only the gas (atmosphere) around the detection point 14 can be sucked.

Therefore, stable measurement results can be reliably obtained even if different workers are used during daily inspections that are frequently performed, and the location of the leak can be easily identified. Moreover, even in the case of a handy type gas detector, which determines that gas suction is impossible and automatically stops when the gas suction port 15 is blocked, ambient gas is sucked from between the gas leakage detection point 14 and the gas suction port 15. Therefore, the measurement work is not suddenly interrupted, and the measurement work can be continued in a stable state.

The hose 17 can be made of various materials as long as it is flexible and allows gas to flow, and the length and thickness can be selected arbitrarily. An appropriate connection method can be selected as long as a predetermined sealed state can be maintained for the connection between the gas suction portion 12 and the gas suction port holding member 16 at both ends of the hose 17 . In addition, when the specific component is hydrogen, it has a higher permeability to ordinary hose materials than general gases, so it is preferable to use a material having a lower hydrogen permeability, such as a fluororesin hose.

2 and 3 show a second embodiment of the handheld gas detector of the present invention. In the following description, only the gas suction port holding member beyond the hose 17 shown in the first embodiment is shown.

A handy gas detector 21 shown in this embodiment has a structure for detecting gas leakage from a leak port 23 provided in a pipe joint portion 22 . The leak port 23 is provided so as to pass through the nut member 24 of the pipe joint portion 22, and the gas suction port holding member 25 has a shape that engages with the hexagonal portion 26 formed on the outer surface of the nut member 24. It also has a grip portion 25a.

The gas suction port holding member 25 has a shape similar to the shape of the engaging portion of a wrench, and has a pair of engaging claws 27a, 27a that sandwich the two opposing parallel surfaces of the hexagonal portion 26. a shaped engaging portion 27; a gas passage portion 28a penetrating through the engaging portion 27; and a positioning member 29 for setting the distance between the outer end of the hand-held gas detector main body and the base end of the gas passage portion 28a by the hose 17 as in the first embodiment. Connected to gas suction. A positioning member 30 is provided on one end side of the engaging portion 27 so as to contact one outer surface 26a of the hexagonal portion 26 in the pipe axial direction.

The gas suction port holding member 25 formed in this manner engages the two surfaces of the nut member 24 having the leak port 23 with the engaging claws 27a and 27a, and also moves the positioning member 30 when measuring the presence or absence of gas leakage. By bringing one outer surface 26a of the hexagonal portion 26 into contact and the positioning member 29 into contact with the peripheral surface of the hexagonal portion 26, the gas suction port 28 and the leak port 23 are separated by a predetermined distance, and , can be opposed at a predetermined angle. As a result, the gas leaking from the leak port 23 can be reliably sucked by the gas suction port 28, so that variations in measurement can be avoided and accurate measurement can be performed. Moreover, although more reliable positioning can be achieved by providing the positioning member 30, the positioning member 30 can be omitted. Furthermore, it is also possible to lock the engaging claws 27a, 27a so that the interval between them can be adjusted.

FIG. 4 shows a third embodiment of the handheld gas detector of the present invention. In the handy type gas detector 31 shown in this embodiment, a gas suction port holding member 32 is formed by a tubular member 34 having a gas suction port 33 opened at its tip, and a gas leakage detection point 35 is detected from the base of the tubular member 34 . Three or more rod-shaped members 36 are projected in the direction of .

The tips of the rod-shaped members 36 are arranged at such intervals that they can come into contact with a flat portion 38a around the leak port 38 provided in the pipe joint portion 37. During measurement, the tips of the rod-shaped members 36 , the gas suction port 33 and the leak port 38 can face each other at a predetermined distance and at a predetermined angle. As a result, the gas leaking from the leak port 38 can be reliably sucked by the gas suction port 33, and variations in measurement can be avoided and accurate measurement can be performed.

The rod-shaped member 36 may be made of a material having sufficient strength not to bend when the tip of the rod-shaped member 36 is brought into contact with the flat portion 38a. can be stably maintained, any number of three or more can be selected.

FIG. 5 shows a fourth embodiment of the handheld gas detector of the present invention. In a handy type gas detector 41 shown in this embodiment, a gas suction port holding member 42 is formed by a tubular member 44 having a gas suction port 43 opened at the tip thereof, and a gas suction port is formed on the base peripheral wall of the tubular member 44 . An auxiliary suction port 45 having an inner diameter smaller than that of 43 is provided. The inner diameter of the gas suction port 43 is equal to or larger than the inner diameter of the leak port 47 provided in the pipe joint portion 46, and the distal end surface of the tubular member around the gas suction port 43 is a flat portion around the leak port 47. It is formed in a size equal to or smaller than that of 47a.

Measurement of gas leakage with this handy type gas detector 41 is performed in a state in which the tip surface of the tubular member 44 is brought into contact with the flat portion 47a. As a result, the gas leaking from the leak port 47 can be reliably sucked by the gas suction port 43 . On the other hand, even if there is no inflow of gas from the leak port 47 to the gas suction port 43, since the air is sucked from the auxiliary suction port 45, the handy type gas detector body does not stop automatically, and the measurement can be performed in a stable state. You can continue working. Incidentally, the auxiliary suction port 45 can be provided at a plurality of locations with an appropriate inner diameter, shape, and structure.

FIG. 6 shows a fifth embodiment of the handheld gas detector of the present invention. In the handy type gas detector 51 shown in this embodiment, the distal end of the gas suction port holding member 52 is formed into a cup shape with a distal end 52a widening. A similar auxiliary suction port 53 is provided. Also in this handy gas detector 51, during measurement, the cup tip edge of the gas suction port holding member 52 formed smaller than the size of the flat portion 54a around the leak port 54 is brought into contact with the flat portion 54a. As a result, the periphery of the leak port 54 can be covered, and the gas leaking from the leak port 54 can be reliably sucked by the gas suction port 53 .

FIG. 7 shows a sixth embodiment of the handheld gas detector of the present invention. In the handy gas detector 61 shown in this embodiment, an extension hose 62 is connected to the auxiliary suction port 45 of the tubular member 44 shown in the fourth embodiment to suck outside air that does not affect the gas to be inspected. It is. By providing the extension hose 62 in this way, the gas leaked from other leak ports arranged near the leak port 63, which is a gas leakage detection point, is not sucked from the auxiliary suction port 45, and the gas is sucked. The gas suction port 65 of the port holding member 64 can reliably suck only the gas leaking from the leak port 63, which is a gas leakage detection point, so that it is not affected by gas leakage in the vicinity, and the gas leakage point can be detected. can be identified more reliably.

DESCRIPTION OF SYMBOLS 11... Handy type gas detector, 12... Gas suction part, 13... Handy type gas detector main body, 14... Gas leakage detection part, 15... Gas suction port, 16... Gas suction port holding member, 17... Hose, 18... Positioning member 21 Handy type gas detector 22 Piping joint 23 Leak port 24 Nut member 25 Gas suction port holding member 25a Handle 26 Hexagonal portion 26a Outer surface 27 Engagement portion 27a Engagement claw 28 Gas suction port 28a Gas passage portion 29 Positioning member 30 Positioning member 31 Handy type gas detector 32 Gas suction port holding member , 33... Gas suction port 34... Tubular member 35... Gas leakage detection point 36... Rod-like member 37... Piping joint part 38... Leak port 38a... Flat part 41... Handy type gas detector 42... Gas suction port holding member 43 Gas suction port 44 Tubular member 45 Auxiliary suction port 46 Piping joint portion 47 Leak port 47a Plane portion 51 Handy type gas detector 52 Gas Suction port holding member 52a Tip 53 Auxiliary suction port 54 Leak port 54a Plane portion 61 Handy type gas detector 62 Extension hose 63 Leak port 64 Gas suction port holding member , 65 gas suction port

Claims (7)

In a handy gas detector that detects a specific component in the gas to be inspected sucked from the gas suction part into the main body of the handy gas detector, gas is sucked into a gas leakage detection point that detects leakage of the gas to be inspected. A gas suction port holding member that holds the port at a preset position, and a hose that connects the gas suction port and the gas suction portion of the handheld gas detector main body ,
The gas leakage detection point is a leak port provided in a pipe joint portion, and the gas suction port holding member is a hexagonal portion formed on the outer surface of a bolt member or a nut member that constitutes the pipe joint portion. An engaging portion that sandwiches two parallel surfaces, the gas suction port that opens inside the engaging portion, and a positioning member that sets the distance between the gas suction port and the leak port. A handy gas detector characterized by: 2. The handheld gas detector according to claim 1 , wherein the engaging portion includes a positioning member that abuts on the outer surface of the hexagonal portion in the direction of the piping axis. In a handy gas detector that detects a specific component in a gas to be inspected that is sucked into the main body of the handy gas detector from a gas suction part, gas is sucked into a gas leakage detection point that detects leakage of the gas to be inspected. a gas suction port holding member that holds the port at a preset position, and a hose that connects the gas suction port and the gas suction portion of the handheld gas detector main body,
The gas suction port holding member is a tubular member having the gas suction port opened at its tip, and three or more rod-shaped members project from the base of the tubular member toward the gas leakage detection location. The handy type gas detector, wherein the gas suction port is arranged at a preset distance from the gas leakage detection point when the tip of the member abuts on the periphery of the gas leakage detection point. vessel. In a handy gas detector that detects a specific component in a gas to be inspected that is sucked into the main body of the handy gas detector from a gas suction part, gas is sucked into a gas leakage detection point that detects leakage of the gas to be inspected. a gas suction port holding member that holds the port at a preset position, and a hose that connects the gas suction port and the gas suction portion of the handheld gas detector main body,
The gas suction port holding member is a tubular member having the gas suction port opened at its tip, and an auxiliary suction port having an inner diameter smaller than that of the gas suction port is provided at least one location in the base peripheral wall of the tubular member,
The tubular member is formed in a cup shape with an enlarged tip,
In the cup-shaped tubular member, the opening of the gas suction port at the tip is formed smaller than the size of the flat portion provided around the leak port provided at the gas leakage detection location. Characteristic handy type gas detector. 5. The handheld gas detector according to claim 4 , wherein an extension hose for sucking outside air which does not affect the gas to be inspected is connected to the auxiliary suction port. In a handy gas detector that detects a specific component in a gas to be inspected that is sucked into the main body of the handy gas detector from a gas suction part, gas is sucked into a gas leakage detection point that detects leakage of the gas to be inspected. a gas suction port holding member that holds the port at a preset position, and a hose that connects the gas suction port and the gas suction portion of the handheld gas detector main body,
The gas suction port holding member is a tubular member having the gas suction port opened at its tip, and an auxiliary suction port having an inner diameter smaller than that of the gas suction port is provided at least one location in the base peripheral wall of the tubular member,
The tubular member is formed in a cup shape with an enlarged tip,
A handheld gas detector, wherein an extension hose for sucking outside air that does not affect the gas to be inspected is connected to the auxiliary suction port. In a handy gas detector that detects a specific component in a gas to be inspected that is sucked into the main body of the handy gas detector from a gas suction part, gas is sucked into a gas leakage detection point that detects leakage of the gas to be inspected. a gas suction port holding member that holds the port at a preset position, and a hose that connects the gas suction port and the gas suction portion of the handheld gas detector main body,
The gas suction port holding member is a tubular member having the gas suction port opened at its tip, and an auxiliary suction port having an inner diameter smaller than that of the gas suction port is provided at least one location in the base peripheral wall of the tubular member,
A handheld gas detector, wherein an extension hose for sucking outside air that does not affect the gas to be inspected is connected to the auxiliary suction port.

Images