JP3882582B2 - Gas meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas meter for integrating and displaying the amount of gas used.
[0002]
[Prior art]
Conventionally, this type of gas meter 8 is configured as shown in FIG. That is, at the time of installation work, the union nut 7 connects the inlet base 1 of the gas meter 8 to the supply gas pipe 5 for sending gas and the outlet base 2 to the distribution gas pipe 6 for sending to the gas equipment. Here, when there is a gas leak in the route of the distribution gas pipe 6, the fluidic type and the ultrasonic type can be detected instantaneously, and the gas can be shut off by the leak detection function. Moreover, although the membrane gas meter takes 30 minutes or more to detect a minute flow rate of about 3 L / h, the leak detection function works and the gas can be shut off similarly.
[0003]
[Problems to be solved by the invention]
However, in a conventional gas meter in which a supply gas pipe for feeding gas and a supply gas pipe for feeding gas and a distribution gas pipe for feeding gas equipment are connected by a union nut, the union nut is loosened by mischief, or a strong impact is applied from the outside. In other words, there has been a problem that the pipe connection portion is shifted or deformed to leak gas. For this reason, measures such as enclosing the gas meter, the supply gas pipe, and the piping gas pipe with a metal box or putting them in a pipe shaft are taken. However, in this case, there are problems that workability is deteriorated, construction costs are increased, and visibility of the meter is deteriorated.
[0004]
In addition, the gas meter with a built-in seismic device detects the strong shock and closes the shut-off valve because the seismic device detects it, but no gas flows through the distribution gas pipe, but the connection between the inlet cap and the supply gas pipe. If it is disconnected, the gas meter cannot shut it off, and in the case of a built-in pressure sensor, for example, when the connection between the inlet base and the supply gas pipe is disconnected and the supply pressure becomes 100 Pa or less, However, even if an abnormality is detected, it can be notified or displayed but cannot be blocked.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a through hole that is larger than the outer diameter of the supply gas pipe and the distribution gas pipe and smaller than the outer diameter of the union nut, and is configured to be movable up and down . A cover having an integrated configuration is provided so as to cover the gas meter, and the cover is provided with a fixing means for fixing to the outer circumference of the gas meter. According to the said invention, it can prevent that a union nut is loosened by mischief. Moreover, even if a strong impact is applied from the outside, the periphery of the pipe connection portion can be protected and the connection portion can be prevented from being displaced or deformed to prevent gas leakage. Since it is difficult to remove the non-rotating member except for the dedicated tool and the cover cannot be removed unless the non-rotating member can be removed, a person other than the construction contractor cannot loosen the union nut by mischief. Therefore, safety against gas leakage can be ensured.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is a gas meter in which an inlet base and a supply gas pipe for feeding gas and an outlet base and a distribution gas pipe for sending to gas equipment are connected by a union nut.
It has a structure that has a through hole larger than the outer diameter of the supply gas pipe and the distribution gas pipe and smaller than the outer diameter of the union nut at a position facing the inlet base and the outlet base, and is configured to be movable up and down , Gas meter integrated structure with the cover so as to cover the outer disposed of, the cover is due to the provision of fixing means for fixing the outer shell of the gas meter can be prevented from being loosened union nut by mischief. In addition, even if a large external force is applied to the cover due to a strong impact from the outside, the periphery of the through hole is subjected to burring so that it can be dispersed over a wide area, so stress is not concentrated on the pipe surface, preventing deformation of the pipe It is possible to protect the periphery of the pipe connection portion and prevent the gas leakage due to the displacement or deformation of the connection portion. Since the union nut is not exposed unless the cover is removed, the union nut cannot be easily loosened. Therefore, safety against gas leakage can be ensured.
[0007]
According to the second aspect of the present invention, the fixing means is the anti-rotation structure, and the anti-rotation member is a screw having a special head and cannot be removed except by a dedicated tool. Since the cover cannot be removed unless the rotation stop member can be removed, a person other than the construction contractor cannot loosen the union nut due to mischief or the like.
[0008]
According to a third aspect of the present invention, the fixing member is a screw having a hexagonal star hole head, and the cover is provided with a recess into which the screw head is inserted. The screw head cannot be grasped. Since it is difficult to remove the screw except for a dedicated tool and the cover cannot be removed, a person other than the construction contractor cannot loosen the union nut due to mischief or the like.
[0009]
According to a fourth aspect of the present invention, the fixing member is a screw having an elliptical head, and the cover is provided with a recess for receiving the head of the screw and a dedicated box driver. Then, the elliptical screw head cannot be grasped. Since it is difficult to remove the cover except for a special tool and the cover cannot be removed, a person other than the construction contractor cannot loosen the union nut due to mischief.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals.
[0011]
Example 1
FIG. 1 is a structural diagram of a gas meter according to Embodiment 1 of the present invention. In the figure, the supply gas pipe 5 and the distribution gas pipe 6 are passed through holes provided in the cover 10 and are held close to each other. In this state, the union nut 7 is tightened and the gas pipe is connected. Next, the cover 10 is lowered to a predetermined position of the gas meter 8 and fixed to the outer shell by a fixing means such as a screw 9. The presence of the cover 10 can prevent the union nut 7 from being easily loosened, so that safety against gas leakage can be ensured. Further, even if a strong impact is applied from the outside, the periphery of the pipe connection portion can be protected by fixing the cover 10 with the fixing member 9 and the burring portion of the through hole contacting the supply gas pipe 5 and the distribution gas pipe 6. It is possible to prevent gas from leaking due to slippage or deformation. Further, when maintenance is necessary, the union nut 7 is loosened by removing the fixing member 9 and the cover 10, so that the gas meter 8 can be easily attached and detached.
[0012]
(Example 2)
A gas meter according to Embodiment 2 of the present invention will be described with reference to FIG. Here, the surrounding stop member 9 of the fixing means is a screw having a special head. Since it is difficult to remove except for the dedicated tool and the cover 10 cannot be removed unless the anti-rotation member 9 is removed, the union nut 7 cannot be loosened by mischief or the like by a person other than the construction contractor. Therefore, it is possible to ensure safety against gas leakage.
[0013]
(Example 3)
A gas meter according to Embodiment 3 of the present invention will be described with reference to FIG. Here, the fixing member 9 around the fixing means is a screw called a Torx having a hexagonal star-shaped head, and the cover is provided with a recess for receiving the head of the screw. I can't grasp my head. Since it is difficult to remove except for the dedicated tool and the cover 10 cannot be removed unless the anti-rotation member 9 is removed, the union nut 7 cannot be loosened by mischief or the like by a person other than the construction contractor. Therefore, safety against gas leakage can be ensured.
[0014]
Example 4
A gas meter according to Example 4 of the present invention will be described with reference to FIGS. Here, the rotation stop member 11 of the fixing means is a screw called Torx having an elliptical head, and the cover is provided with a recess for receiving a screw head and a dedicated box driver. The screw head cannot be grasped. Since it is difficult to remove except for the dedicated tool 12, and the cover 10 cannot be removed unless the detent member 11 is removed, the union nut 7 cannot be loosened by mischief or the like by a person other than the construction contractor. Therefore, safety against gas leakage can be ensured.
[0015]
【The invention's effect】
As described above, according to the present invention, the union nut connecting the inlet base and the supply gas pipe and the outlet base and the distribution gas pipe is loosened by mischief or the like, or the pipe connection portion is subjected to a strong impact from the outside. It is possible to prevent gas leakage due to displacement or deformation. In addition, it is not necessary to enclose the gas meter, supply gas pipe, and distribution gas pipe with a metal box or put it in the pipe shaft, which deteriorates workability, increases construction costs, and reduces the visibility of the meter. The problem of disappearing.
[0016]
In addition, it is difficult to remove the non-rotating member except for the dedicated tool, and the cover cannot be removed unless the non-rotating member can be removed. can get.
[Brief description of the drawings]
FIG. 1 is a front view and a partial sectional view of a gas meter according to a first embodiment of the present invention. FIG. 2 is a front view and a partial sectional view showing a connection state in the middle of attaching a cover of the gas meter according to the second and third embodiments of the present invention. FIG. 4 is a front view and a partial sectional view showing a mounting state of an elliptical head screw of a fixing member and a box driver in a gas meter according to Embodiment 4 of the present invention. FIG. 4 shows the relationship between a rotation stop member and a dedicated tool in the cover mounting state of the gas meter. Schematic diagram [Fig. 5] Front view showing the pipe connection of a conventional gas meter [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inlet base 2 Outlet base 3 Reset button 4 Display part 5 Gas pipe for supply 6 Gas pipe for distribution 7 Union nut 8 Gas meter 9, 11 Rotation stop member (fixing means)
10 Cover 12 Box driver

Claims (4)

In a gas meter in which an inlet base and a supply gas pipe for feeding gas and an outlet base and a distribution gas pipe for sending to gas equipment are connected by a union nut,
A structure that has a through hole that is larger than the outer diameter of the supply gas pipe and the distribution gas pipe and smaller than the outer diameter of the union nut at a position facing the inlet base and the outlet base, and is configured to be movable up and down. And a cover integrated with the union nut and the gas meter so as to cover the outer periphery of the gas meter, and the cover includes a fixing means for fixing the cover to the outer periphery of the gas meter.   The gas meter according to claim 1, wherein the fixing means includes an anti-rotation member that can be attached and detached only with a special tool.   The gas meter according to claim 2, wherein the head of the rotation stop member is a screw having a star-shaped recess, and the cover is provided with a recess into which only the head of the screw is inserted.   The gas meter according to claim 2, wherein the head outer shape of the anti-rotation member is an ellipse, and the cover is provided with a recess into which only a box wrench adapted to the outer periphery of the screw head is inserted.

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