JP6991097B2 - Large capacity meter - Google Patents

Description

The present invention comprises a non-correction guideline indicating a value measured by a measuring instrument for measuring the flow rate of a gas flowing through the inside, and a correction guideline indicating a corrected value obtained by correcting the value measured by the measuring instrument. The present invention relates to a large-capacity meter having both of them and provided with a viewing window for visually recognizing the non-correction pointer arranged inside the housing.

The large-capacity meter has a non-correction guideline that indicates the value measured by the measuring instrument that measures the flow rate of the gas flowing inside (for example, city gas 13A), and the value measured by the measuring instrument is the gas. A correction guideline indicating a correction value corrected based on temperature, pressure, etc. is provided (the prior art document cannot be disclosed because there is no data showing the characteristics of the large capacity meter).
Normally, a large-capacity meter is used by a meter reader to read the value of the correction pointer and use it for charge calculation, and the value of the non-correction pointer is used when an abnormality occurs in the large-capacity meter. In addition to being arranged, the non-correction pointer is arranged inside the housing of the large-capacity meter so that it cannot be easily seen from the outside. Specifically, a viewing window for a non-correction pointer is formed in the housing, and the viewing window is closed with a metal lid and fixed with a screw or the like. Then, when there is a possibility that an abnormality has occurred in the weighing performance, a worker having specialized skills uses a tool to remove the metal lid in order to confirm the non-correction guideline.

The above-mentioned work takes time and effort for the operator, and also leads to risks such as damage to the meter (damage such as screw licking), loss of parts (loss of screw and metal lid), and injury to the operator. There was room for.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to reduce the risk of misidentifying a non-correction guideline as a correction guideline, but at the same time, there is a risk of damage to the meter, loss of parts, injury to the operator, and the like. The point is to provide a large-capacity meter that can reduce the number of problems.

Large-capacity meters to achieve the above objectives
The housing is equipped with a non-correction guideline that indicates the value measured by a measuring instrument that measures the flow rate of gas flowing inside, and a correction guideline that indicates a correction value that corrects the value measured by the measuring instrument. It is a large-capacity meter provided with a viewing window for visually recognizing the non-correction pointer arranged inside the meter, and its characteristic configuration is:
A metal substrate having an opening matching the viewing window is fixed to the housing.
In a fixed state in which the metal substrate is fixed to the housing, an open posture in which the non-correction pointer can be visually recognized from the outside through the viewing window and the opening, and a closed posture in which visibility from the outside is prohibited. The point is that the opening / closing lid that can be switched with is provided with a mounting jig that attaches the opening / closing lid to the metal substrate in a state of being slidable in a sliding direction along the surface of the metal substrate.

According to the above-mentioned feature configuration, by providing a metal substrate having an opening matching the viewing window for visually recognizing the non-correction pointer on the surface of the housing, other members can be slid with respect to the surface of the metal substrate. It can be freely provided to prevent damage to the housing even if it is slid.
Then, the opening / closing lid is slidably attached to the surface of the metal substrate in the sliding direction along the surface by the mounting jig, and the opening / closing lid is closed when it is not necessary to read the non-correction guideline. When it is necessary to read the non-correction guideline, the non-correction guideline can be read out by sliding the opening / closing lid to open the posture without performing a special operation using a tool.
This makes it possible to realize a large-capacity meter that can reduce the risk of damage to the meter, loss of parts, injury to the operator, etc., while reducing the possibility of misidentifying the non-correction pointer as the correction guideline.

Further features of the large-capacity meter
The opening / closing lid is provided with a slide groove extending along the sliding direction.
The mounting jig is
In the mounted state in which the opening / closing lid is attached, it has a rod shape extending from the outside of the housing, which is the outside of the housing, toward the inside of the housing, which is the inside of the housing, in the thickness direction of the opening / closing lid.
In the mounting state where the opening / closing lid is attached, the fitting portion is fitted into the slide groove and is thicker than the thickness of the opening / closing lid in the thickness direction of the opening / closing lid.
In the mounted state in which the opening / closing lid is attached, a retaining portion having a diameter larger than the groove width of the slide groove is provided on the outer side of the housing from the fitting portion in the thickness direction of the opening / closing lid.

According to the above characteristic configuration, the mounting jig is fitted into the slide groove and has a fitting portion thicker than the thickness of the opening / closing lid in the thickness direction of the opening / closing lid, and is outside the housing from the fitting portion in the thickness direction of the opening / closing lid. By having a retaining portion having a diameter larger than the groove width of the slide groove, a gap can be formed between the opening / closing lid and the retaining portion. While maintaining a state of high slidability by making it small, it is possible to satisfactorily prevent the opening / closing lid from coming off to the outside of the housing.

Further features of the large-capacity meter
The metal substrate has a through hole that opens in the thickness direction of the metal substrate.
The through hole is an annular shape extending from the inner wall of the hole toward the center of the hole at the end portion on the housing side in the thickness direction of the metal substrate in the fixed state in which the metal substrate is fixed to the housing. With the flange part of
In the mounting state in which the opening / closing lid is attached, the mounting jig has a fitting portion that fits into the through hole inside the housing from the fitting portion and a housing that is inside the housing from the fitting portion. It has a male screw part that is screwed into the female screw part formed on the body, and has a male screw part.
The metal in a form in which the male screw portion of the mounting jig is screwed into the female screw portion of the housing, and the fitting portion of the mounting jig sandwiches the flange portion with the housing. The point is that the substrate is fixed to the housing.

According to the above characteristic configuration, the male screw portion of the mounting jig is screwed into the female screw portion of the housing by the mounting jig, and the fitting portion of the mounting jig sandwiches the flange portion between the housing and the female screw portion. The metal substrate can be fixed to the housing in the form of the above.
That is, in the mounting jig of the present invention, the opening / closing lid can be slidably mounted on the surface of the metal substrate while the metal substrate is satisfactorily fixed to the housing.

Further features of the large-capacity meter
The mounting jig is composed of a first jig having the retaining portion, a second jig having the fitting portion, the fitting portion, and the male screw portion, and the first jig and the above. The point is that the second jig is detachably configured.

According to the above characteristic configuration, after the metal substrate is fixed to the housing with the first jig, the opening / closing lid can be slidably attached to the metal substrate with the second jig. A highly efficient mounting jig can be realized.

Further features of the large-capacity meter
On the surface of the metal substrate, the mounting jig extends along the sliding direction and protrudes from the surface of the metal substrate in a mounting state in which the opening / closing lid is attached. A point is that a protruding guide portion for guiding sliding in the sliding direction is provided.

For example, when the opening / closing lid has only one or two slide grooves and is slidably attached by one mounting jig in each slide groove, when the opening / closing lid slides, the slide groove There is a risk that the extension direction and the sliding direction will deviate.
According to the above-mentioned characteristic configuration, since the protruding guide portion guides the sliding of the opening / closing lid in the sliding direction, the sliding direction can be satisfactorily aligned with the extending direction of the slide groove.

As a large-capacity meter that has been explained so far,
The surface of the metal substrate is subjected to a sliding resistance reducing process for reducing the sliding resistance with the opening / closing lid, and the sliding resistance reducing process is a surface in which the surface of the metal substrate is coated with a brass thin film. It is preferably a treatment.

Thereby, the sliding of the opening / closing lid on the surface of the metal substrate can be realized more smoothly.

Further features of the large-capacity meter
A packing is provided between the metal substrate and the housing to prevent the flow of liquid.

According to the above-mentioned feature configuration, it is possible to prevent rainwater or the like from entering the inside of the housing from the outside of the housing through between the housing and the metal substrate.

Large-capacity meters to achieve the above objectives
The housing is equipped with a non-correction guideline that indicates the value measured by a measuring instrument that measures the flow rate of gas flowing inside, and a correction guideline that indicates a correction value that corrects the value measured by the measuring instrument. It is a large-capacity meter provided with a viewing window for visually recognizing the non-correction pointer arranged inside the meter, and its characteristic configuration is:
A pivot portion that rotatably supports the swing shaft around the swing shaft center is provided in a state of being fixed to the housing.
The opening / closing lid that is connected to the swinging shaft and swings around the swinging axis center is in an open posture in which the non-correction pointer can be visually recognized from the outside through the viewing window and a closed posture in which visibility from the outside is prohibited. The point is that it can be switched freely with.

According to the above-mentioned feature configuration, the viewing window is opened by swinging the opening / closing lid around the swing axis center by providing the swing shaft and the pivot portion that rotatably supports the swing shaft. It is possible to switch between an open posture and a closed posture that closes. As a result, when it is not necessary to read the non-correction guideline, the opening / closing lid is kept in the closed position, and when it is necessary to read the non-correction guideline, the opening / closing lid is opened without any special operation using a tool. The non-correction pointer can be read out as the open posture by sliding and moving.
This makes it possible to realize a large-capacity meter that can reduce the risk of damage to the meter, loss of parts, injury to the operator, etc., while reducing the risk of misidentifying the non-correction pointer as the correction guideline.

Further features of the large-capacity meter
The opening / closing lid is composed of an inner lid and an outer lid which are provided in order from the side closest to the housing in the closed posture.

According to the above-mentioned feature configuration, the opening / closing lid is provided twice by the inner lid and the outer lid. Therefore, for example, the inner lid is made of a material having high adhesion to the housing to provide waterproof performance, but the outer lid By constructing the lid from a metal material, relatively high strength can be maintained.

Side view of the large-capacity meter according to the embodiment when the opening / closing lid is in the closed posture. Side view of the large-capacity meter according to the embodiment when the opening / closing lid is in the open posture. The figure including a part of the section III-III in FIG. Side view of the large capacity meter according to another embodiment Front view and side view of the large-capacity meter according to another embodiment when the opening / closing lid is in the closed posture. Front view and side view of the large-capacity meter according to another embodiment when the opening / closing lid is in the open posture.

The large-capacity meter 100 according to the embodiment of the present invention relates to a large-capacity meter 100 that can reduce the risk of damage to the meter, loss of parts, injury to an operator, etc., while reducing the risk of misidentifying the non-correction pointer S2 as the correction guideline S1. .. Hereinafter, the large-capacity meter 100 according to the embodiment of the present invention will be described with reference to the drawings.

[Embodiment]
As shown in FIGS. 1 to 3, the large-capacity meter 100 according to the embodiment of the present invention is attached to a gas pipe through which city gas 13A (an example of gas) or the like passes, and is supplied at a pressure equal to or higher than an intermediate pressure. The non-correction guideline S2, which indicates the value measured by a measuring instrument (not shown) that measures the flow rate of city gas flowing inside, and the value measured by the measuring instrument are used in this case. A correction guideline S1 indicating the corrected correction value is provided, and a viewing window 91 (shown in FIG. 2) for visually recognizing the non-correction guideline S2 arranged inside the housing K is provided.
The correction guideline S1 and the non-correction guideline S2 are configured so that the guideline value is displayed by inserting a key (not shown) into the keyhole 81 provided in the housing K, and the displayed value is displayed. Is configured to be switchable, for example, "flow rate ⇒ pressure ⇒ temperature" each time the switching button 82 provided on the side of the keyhole 81 is pressed. Further, as the displayed pressure value and temperature, the values measured by the pressure gauge and the thermometer 83 are used.
As the measuring instrument, for example, a turbine-type measuring instrument capable of measuring a relatively large flow rate can be used, and the measured flow rate according to the rotation speed of the turbine (not shown) is derived, and the temperature of the city gas is determined. It has a control unit (not shown) that corrects to the standard flow rate based on pressure and the like. The control unit indicates the corrected standard flow rate in the correction guideline S1 and the measured flow rate before the correction in the non-correction guideline S2.

The large-capacity meter 100 is configured as follows so that the non-correction pointer S2 is not visible from the outside in a normal state.
As shown in FIGS. 1 to 3, in the large-capacity meter 100, a metal substrate 10 having an opening 11 (shown in FIG. 2) having substantially the same shape as the viewing window 91 is fixed to the housing K, and the metal substrate 10 is formed. In the fixed state fixed to the housing K, the non-correction pointer S2 can be visually recognized from the outside (the posture shown in FIG. 1) and the visibility from the outside is prohibited through the viewing window 91 and the opening 11. The opening / closing lid 20 that can be switched between the closed posture (the posture shown in FIG. 2) is slidable in the sliding direction along the surface of the metal substrate 10 (the direction along the arrow Z in FIGS. 1 and 2). A mounting jig 30 to be attached to 10 is provided.
When the description of the viewing window 91 is added, a non-correction guideline S2 or the like is provided inside the housing K via a circular opening (not shown) formed in the housing K, and a seal for sealing the circular opening is provided. The stopper 90 is attached to the circular opening by a plurality of screws N1, and a viewing window 91 is formed with respect to the sealing lid 90.

In the large-capacity meter 100 according to the embodiment, the sliding direction is a direction along the vertical direction, and the opening / closing lid 20 is in an open posture above the vertical direction and in a closed posture below. It is composed. Therefore, the opening / closing lid 20 which has been opened by the operation by the fingertip of the meter reader or the like returns to the closed posture by its own weight when the operation is stopped. With this configuration, the opening / closing lid 20 takes a closed posture in a natural state not operated by the meter reader, the viewing window 91 is closed, and the non-correction guideline S2 is prohibited from being visually recognized from the outside.

The metal substrate 10 is preferably made of various metals surface-treated in consideration of strength, deterioration over time, and slidability, and slides on the surface along the sliding direction. The sliding resistance reduction processing is performed to reduce the sliding resistance of the opening / closing lid 20. As the sliding resistance reduction processing, a surface treatment of coating the surface of the metal substrate 10 with a thin film such as brass is suitable. Further, on the surface of the metal substrate 10, the mounting jig 30 extends along the sliding direction and protrudes from the surface in the mounting state in which the opening / closing lid 20 is mounted, in the sliding direction of the opening / closing lid 20. A protruding guide portion 12 for guiding sliding is provided. The protruding guide portions 12 are provided in pairs in a form of guiding both side surfaces of the opening / closing lid 20 having a substantially rectangular shape in the side view of FIGS. 1 and 2 along the sliding direction.
Further, the metal substrate 10 has a pair of through holes 13a that open in the thickness direction of the metal substrate. The through hole 13a is a hole inner wall at the end on the housing K side in the thickness direction of the metal substrate 10 (direction along arrow X in FIG. 3) in a fixed state in which the metal substrate 10 is fixed to the housing K. It has an annular flange portion 13b extending from the hole axis toward the center of the hole. The metal substrate 10 is fixed to the housing K by the mounting jig 30 described later using the through hole 13a and the flange portion 13b.

The opening / closing lid 20 is provided with a pair of slide grooves 21 extending along the sliding direction (direction along the arrow Z in FIGS. 1 and 2). In the side view shown in FIGS. 1 and 2, the opening / closing lid 20 has a pair of slide grooves 21 overlapped with the through hole 13a of the metal substrate 10 regardless of whether the opening / closing lid 20 is in the open posture or the closed posture. , It is attached by the attachment jig 30. The opening / closing lid 20 is preferably made of various metals surface-treated in consideration of strength, deterioration over time, and slidability.

The mounting jig 30 is provided so as to overlap the through hole 13a of the metal substrate 10 and the slide groove 21 of the opening / closing lid 20 in the side view shown in FIGS. 1 and 2.
In the mounting state (states shown in FIGS. 1 to 3) in which the opening / closing lid 20 is attached, the mounting jig 30 has a housing K as a whole in the thickness direction of the opening / closing lid 20 (direction along arrow Z in FIGS. 1 to 3). It has a rod shape extending from the outside of the housing, which is the outside of the housing, toward the inside of the housing, which is the inside of the housing K.

As shown in FIG. 3, the mounting jig 30 is fitted into the slide groove 21 and is thicker than the thickness of the opening / closing lid (L2 in FIG. 3) in the thickness direction of the opening / closing lid (L1 in FIG. 3) in the mounting state. ) The fitting portion 30a and the retaining portion having a diameter larger than the groove width of the slide groove 21 on the outside of the housing (the tip end side of the arrow X in FIG. 3) from the fitting portion 30a in the thickness direction of the opening / closing lid 20 in the above mounting state. It has a site N2.
Further, the mounting jig 30 fits into the fitting portion 30b that fits into the through hole 13a of the metal substrate 10 inside the housing (the base end side of the arrow X in FIG. 3) from the fitting portion 30a in the mounting state. It has a male screw portion 30c screwed to a female screw portion 90a formed in the housing K inside the housing portion 30b. As a result, the male screw portion 30c of the mounting jig 30 is screwed into the female screw portion 90a of the housing K, and the fitting portion 30b of the mounting jig 30 is sandwiched between the female screw portion 90a and the housing K and the flange portion of the metal substrate 10. The metal substrate 10 is fixed to the housing K in a form of sandwiching the 13b.

That is, the mounting jig 30 has the retaining portion N2, the fitting portion 30a, the fitting portion 30b, and the male screw portion 30c in this order from the outside of the housing (the tip side of the arrow X in FIG. 3) in the mounting state. More specifically, the first jig J1 composed of the retaining portion N2 and the second jig J2 composed of the fitting portion 30a, the fitting portion 30b, and the male screw portion 30c are separably configured. ing.
The first jig J1 has a male screw N2a inside the housing (the base end side of the arrow X in FIG. 3), and the second jig J2 has a female screw 30d inside. The male screw N2a of the first jig J1 is screwed into the female screw 30d of the second jig J2, and both are fastened.

A description will be added about a method of fixing the metal substrate 10 and a method of attaching the opening / closing lid 20.
The second jig of the mounting jig 30 is in a state where the female screw portion 90a of the housing K and the through hole 13a of the metal substrate 10 are superimposed and the metal substrate 10 is arranged on the surface of the housing K. While rotating J2 about the axis, the male screw portion 30c is screwed into the female screw portion 90a of the housing K. As a result, the flange portion 13b of the metal substrate 10 is sandwiched between the fitting portion 30b of the second jig J2 and the surface of the housing K, and the metal substrate 10 is fixed to the housing K. Here, the fitting portion 30a has a hexagonal shape in a side view (direction view along the arrow X in FIG. 3), and has a shape that can be rotated by a spanner or the like.
Further, the opening / closing lid 20 is placed on the metal substrate 10 with the slide groove 21 of the opening / closing lid 20 aligned with the fitting portion 30a of the second jig J2, and the male screw N2a of the first jig J1 is placed. It is screwed into the female screw 30d of the second jig J2 and fastened. Even when the jig J2 is fastened in this way, the thickness of the fitting portion 30a of the second jig J2 is thicker than the thickness of the opening / closing lid 20, so that a gap Sp is formed between the retaining portion N2 of the first jig J1 and the opening / closing lid 20. It is formed and prevents the opening / closing lid 20 from coming off without hindering the sliding of the opening / closing lid 20 in the sliding direction. Here, a cross notch is formed at the top of the retaining portion N2 of the first jig J1 and is configured to be rotatable by a screwdriver or the like.

[Another Embodiment]
(1) In the above embodiment, the sliding direction is a direction along the vertical direction, but the object of the present invention can be satisfactorily achieved even in other directions such as a direction orthogonal to the vertical direction.
Further, a pair of the protruding guide portion 12 and the slide groove 21 is provided, and the configuration in which the mounting jig 30 is attached to each of the slide grooves 21 is exemplified.
However, each of the protruding guide portion 12 and the slide groove 21 may be single or may be a plurality of three or more, and a configuration in which the numbers of both are different is also included in the scope of rights.

(2) In the second embodiment, as shown in FIG. 4, a configuration is adopted in which a packing Pa for blocking the flow of a fluid such as rainwater is provided between the housing K (sealing lid 90). It doesn't matter.

(3) In the above embodiment, the configuration for opening and closing the viewing window 91 is shown by adopting a configuration in which the opening / closing lid 20 is slid in the sliding direction.
In the other embodiment, in the above embodiment, the configuration relating to the metal substrate 10, the opening / closing lid 20, and the mounting jig 30 is realized by another configuration. Therefore, since the configuration of the large-capacity meter 100 is the same as that of the above-described embodiment, the same reference numerals as those of the above-described embodiment are given and the description thereof will be omitted.
As shown in FIGS. 5 and 6, the large-capacity meter 100 according to the other embodiment has a pivot portion 40 having a pivot portion 40a that rotatably supports the swing shaft J around the swing axis P. The opening / closing lid 50, which is provided in a state of being fixed to the housing K and is connected to the swing shaft J and swings around the swing shaft center P, can be visually recognized from the outside through the viewing window 91. It is freely switched between an open posture (posture shown in FIG. 6) and a closed posture (posture shown in FIG. 5) that prohibits visibility from the outside.
Here, the opening / closing lid 50 is composed of an inner lid 41 and an outer lid 20 provided in order from the side closest to the housing K in the closed posture.
The outer lid 20 and the inner lid 41 are fastened by a screw N2 and a nut W in a state of penetrating a long hole 21 formed in the outer lid 20 and a through hole (not shown) formed in the inner lid 41. There is.

It should be noted that the configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

The large-capacity meter of the present invention can be effectively used as a large-capacity meter that can reduce the risk of damage to the meter, loss of parts, injury to the operator, etc., while reducing the risk of misidentifying the non-correction pointer as the correction pointer. Is.

10: Metal substrate 11: Opening portion 12: Protruding guide portion 13a: Through hole 13b: Flange portion 20: Opening / closing lid 21: Slide groove 30: Mounting jig 30a: Fitting portion 30b: Fitting portion 30c: Male screw portion 40: Pivot branch 41: Inner lid 50: Opening / closing lid 90a: Female screw part 91: Viewing window 100: Large capacity meter J: Swinging shaft K: Housing N2: Retaining part Pa: Packing S1: Correction guideline S2: Non-correction guideline

Claims (9)

The housing is equipped with a non-correction guideline that indicates the value measured by a measuring instrument that measures the flow rate of gas flowing inside, and a correction guideline that indicates a correction value that corrects the value measured by the measuring instrument. It is a large-capacity meter provided with a viewing window for visually recognizing the non-correction pointer arranged inside the.
A metal substrate having an opening matching the viewing window is fixed to the housing.
In a fixed state in which the metal substrate is fixed to the housing, an open posture in which the non-correction pointer can be visually recognized from the outside through the viewing window and the opening, and a closed posture in which visibility from the outside is prohibited. A large-capacity meter provided with a mounting jig that attaches an open / close lid that can be switched with the metal substrate to the metal substrate in a slidable state along the surface of the metal substrate. The opening / closing lid is provided with a slide groove extending along the sliding direction.
The mounting jig is
In the mounted state in which the opening / closing lid is attached, it has a rod shape extending from the outside of the housing, which is the outside of the housing, toward the inside of the housing, which is the inside of the housing, in the thickness direction of the opening / closing lid.
In the mounting state where the opening / closing lid is attached, the fitting portion is fitted into the slide groove and is thicker than the thickness of the opening / closing lid in the thickness direction of the opening / closing lid.
The first aspect of the present invention, wherein in the mounted state in which the opening / closing lid is attached, a retaining portion having a diameter larger than the groove width of the slide groove is provided on the outer side of the housing from the fitting portion in the thickness direction of the opening / closing lid. Large capacity meter. The metal substrate has a through hole that opens in the thickness direction of the metal substrate.
The through hole is an annular shape extending from the inner wall of the hole toward the center of the hole at the end portion on the housing side in the thickness direction of the metal substrate in the fixed state in which the metal substrate is fixed to the housing. With the flange part of
In the mounting state in which the opening / closing lid is attached, the mounting jig has a fitting portion that fits into the through hole inside the housing from the fitting portion and a housing that is inside the housing from the fitting portion. It has a male screw part that is screwed into the female screw part formed on the body, and has a male screw part.
The metal in a form in which the male screw portion of the mounting jig is screwed into the female screw portion of the housing, and the fitting portion of the mounting jig sandwiches the flange portion with the housing. The large-capacity meter according to claim 2, wherein the substrate is fixed to the housing. The mounting jig is composed of a first jig having the retaining portion, a second jig having the fitting portion, the fitting portion, and the male screw portion, and the first jig and the above. The large-capacity meter according to claim 3, wherein the second jig is detachably configured. On the surface of the metal substrate, the mounting jig extends along the sliding direction and protrudes from the surface of the metal substrate in a mounting state in which the opening / closing lid is attached. The large-capacity meter according to any one of claims 1 to 4, wherein a protruding guide portion for guiding sliding in the sliding direction is provided. The surface of the metal substrate is subjected to a sliding resistance reducing process for reducing the sliding resistance with the opening / closing lid, and the sliding resistance reducing process is a surface in which the surface of the metal substrate is coated with a brass thin film. The large-capacity meter according to any one of claims 1 to 5, which is a process. The large-capacity meter according to any one of claims 1 to 6, wherein a packing for blocking the flow of liquid is provided between the metal substrate and the housing. The housing is equipped with a non-correction guideline that indicates the value measured by a measuring instrument that measures the flow rate of gas flowing inside, and a correction guideline that indicates a correction value that corrects the value measured by the measuring instrument. It is a large-capacity meter provided with a viewing window for visually recognizing the non-correction pointer arranged inside the.
A pivot portion that rotatably supports the swing shaft around the swing shaft center is provided in a state of being fixed to the housing.
The opening / closing lid that is connected to the swinging shaft and swings around the swinging axis center is in an open posture in which the non-correction pointer can be visually recognized from the outside through the viewing window and a closed posture in which visibility from the outside is prohibited. A large-capacity meter that can be switched freely with. The large-capacity meter according to claim 8, wherein the opening / closing lid is composed of an inner lid and an outer lid provided in order from the side closer to the housing in the closed posture.

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