JP2001296159A - Membrane-type gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane-type gas meter, capable of effectively utilizing existing gas meter and simply reducing the pressure loss. SOLUTION: A meter casing 10 is partitioned by a partition wall 3 into a lower space and an upper space 5. First and second metering chambers 11a, 11b and 12a, 12b, partitioned by metering membranes 2a, 2b, are provided in the lower space. Communicating holes 21a, 22a and 21b, 22b are provided corresponding to the first and second metering chambers at a partition wall 5. Thus, a gas is selectively introduced into and exhausted from the metering chambers via the holes. In this case, metering chamber side ends of the holes 12a, 11b of the partition wall are formed in gradually radially enlarging flared paths 23 toward the chambers 11b, 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas meter for measuring gas based on reciprocating movement of a measuring film provided in a measuring space of a meter casing.

[0002]

BACKGROUND OF THE INVENTION In gas meters for city gas, models (numbers) are provided in accordance with the gas flow rate to be used and the like. The transition to the number of issues is underway.

In such a situation, for example, an existing No. 3 meter is used as a No. 4 having a larger flow rate in order to smoothly use the existing No. 3 gas meter while effectively using an existing gas meter. It is desired that the so-called No. 3 meter be changed to No. 4. However, if the No. 3 meter is used as it is as the No. 4 meter, the pressure loss increases with an increase in the flow rate, so that it is necessary to reduce the pressure loss.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a membrane gas meter that can effectively use an existing gas meter and can easily reduce pressure loss.

[0005]

Means for Solving the Problems The present inventors have made intensive efforts and obtained the following findings. That is, in a normal membrane gas meter, a communication hole communicating from the upper space in the meter casing to each measurement chamber in the lower space is provided, and gas is introduced from the upper space into each measurement chamber through the communication hole. However, the gas introduced from the communication hole into the measuring chamber is not smoothly dispersed throughout the measuring chamber, and, for example, around the opening on the measuring chamber side of the communication hole, a vortex or the like is generated to reduce the gas passage resistance. It has been found that the pressure loss has increased and the pressure loss has increased. Further, based on this finding, the present inventors repeatedly conducted detailed experimental research, and found out an optimal configuration capable of achieving the above-mentioned object, and completed the present invention.

That is, according to the present invention, the inside of the meter casing is divided into a lower space and an upper space by a partition wall, and the first and second spaces are divided by the measuring membrane in the lower space.
While the weighing chamber is provided, a gas inlet and a gas outlet are provided on the upper part of the meter casing, and the partition wall has a space between the weighing chamber and the upper space corresponding to the first and second weighing chambers, respectively. Communication holes are provided to communicate between them, and the gas flowing into the upper space from the gas inlet is selectively introduced into the first and second measuring chambers through the corresponding communication holes, In a membrane gas meter in which gas in the first and second measuring chambers is selectively discharged through the corresponding communication hole and flows out from the gas outlet, at least one communication hole in the partition wall is provided. The gist of the present invention is that the end of the measuring chamber is formed in a divergent path whose diameter gradually increases toward the measuring chamber.

In the membrane gas meter according to the present invention, the end of the communication hole communicating the upper space with the predetermined measuring chamber is formed in a divergent path whose diameter gradually increases toward the measuring chamber. Therefore, when gas flows into the measuring chamber from the upper space, the gas is evenly distributed in a balanced manner throughout the measuring chamber along the inner peripheral surface of the divergent path,
Smooth suction without eddy or turbulence. Further, even when the gas is discharged from the measuring chamber, the gas in the entire area of the measuring chamber is guided to the communication hole along the inner peripheral surface of the divergent path, and is efficiently and smoothly discharged.

Further, the present invention can be easily realized, for example, only by forming the end of the communication hole in a divergent shape in an existing membrane gas meter.

On the other hand, recent membrane gas meters have two
The mainstream is a multi-layer type in which a total of four measuring chambers are provided side by side in the front-rear direction. In such a gas meter, a communication hole corresponding to two inner measuring chambers of the four measuring chambers is provided. By forming the divergent path, the gas can be sucked and discharged more efficiently and smoothly.

That is, in the present invention, the lower space has a front measuring space and a rear measuring space, and the first and second measuring chambers are respectively formed in these measuring spaces, and the respective measuring chambers are formed. The communication holes are respectively formed corresponding to the first and second measurement chambers of the respective measurement spaces.
It is preferable to adopt a configuration in which the divergent path is formed in the communication hole corresponding to the inner measuring chamber.

[0011]

FIG. 1 is a front sectional view showing a membrane gas meter according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a measuring section of the membrane gas meter, and FIG. It is a side view which cuts out the lower part of a gas meter and shows roughly.

As shown in these figures, a meter casing (10) of the gas meter has a case body (10a) constituting a lower portion thereof and an upper case (10) constituting an upper portion thereof.
b), and the upper case (10b) is provided with a gas inlet (7a) and a gas outlet (7b). A lower space (1) provided inside the case body (10a);
And an upper space (5) provided inside the upper case (10b) are partitioned by an upper wall of the case body (10a), that is, upper and lower partition walls (3), and a lower space (1).
The front metering space (1a) by the front and rear partition walls (2)
And a rear metering space (1b).

In each of the measuring spaces (1a) and (1b), a measuring membrane (2a) for dividing the measuring spaces (1a) and (1b) back and forth.
(2b) are respectively arranged.

Each of the measuring membranes (2a) and (2b) has a circular shape.
1) In the state where (51) is arranged, screws (52a) and nuts (52b) are fastened to these center positions from both sides, so that the membrane plate (51) is attached to the measuring membrane (2a) (2).
b) is fixed in a state where it is clamped from both sides. The screw (5) is provided at the center position on the front side of the one membrane plate (51).
The mounting bracket (53) is fixed by 2a) and a nut (52b).

The outer peripheral edges of the measuring membranes (2a) and (2b) with the membrane plates are hermetically sealed to the inner peripheral edges of the front and rear measuring spaces (1a) and (1b) through an annular membrane regulating plate (55). It is screwed and fixed in the state. Thereby, the front metering space (1a) is
It is separated front and rear by the front measuring membrane (2a), and the front first
And the second measuring chambers (11a) and (12a) are formed, and the rear measuring space (1b) is partitioned back and forth by the rear measuring membrane (2b) to form the rear first and second measuring chambers (11a).
b) (12b) is formed.

The upper and lower partition walls (3) of the case body (10a) correspond to the measuring spaces (2a) and (2b), respectively.
A wing shaft (56) is arranged. Each blade shaft (56) is arranged in a predetermined measuring chamber (11a) (12b), and the upper end is arranged in the upper space (5), and in this state, it is rotatable around the axis. Is attached to the partition wall (3) in an airtight manner.

One end of a swing arm (57) is fixed to the lower end of each blade shaft (56), and the other end of each swing arm (57) is attached to a mounting bracket for the membrane plate (51). (53) are attached rotatably.

Thus, when the measuring membranes (2a) and (2b) move back and forth, each swing arm (57) swings back and forth following the movement, and each blade shaft (56) Are configured to rotate.

At the front and rear openings of the front and rear measurement spaces (1a) and (1b), a closing plate (59) is screwed into a gas-tight manner via a gasket (58).

In FIG. 2, the front metering space (1
Only the configuration corresponding to a) is shown, and the configuration corresponding to the rear metering space (1b) is not shown.

On the other hand, as shown in FIGS. 3 to 6, a pedestal portion (20) for attaching a distribution member (30) to be described later is provided on the upper surface of one side of the partition wall (3). The pedestal part (20) has the above four weighing chambers (11a).
(12a) First to fourth four communication holes (21a), (22a), (2) which communicate with (11b) and (12b) respectively.
1b) and (22b) are formed.

Each of the communication holes (21a) (22a) (21
b) (22b), the second measuring chamber (12a) of the front measuring space (1a), that is, the communication hole (22a) corresponding to the inner measuring chamber, and the first measuring chamber of the rear measuring space (1b). (1
1b), that is, the communication hole (21) corresponding to the inner measuring chamber
b) includes a divergent path (23) at the measuring chamber side end.
(23) is formed.

That is, the inner communication holes (22a) (21)
The measuring chamber side end of b) is formed so as to gradually increase in diameter toward the measuring chamber, and the divergent path (23) (23)
It is configured as In order to facilitate understanding of the invention, the inner communication holes (22a) are shown in FIGS.
The openings of the divergent paths (23) and (23) in (21b) are hatched (sloping lines to the left) and the portions corresponding to the conventional openings are cross-hatched (slanting lines to the right).

Here, the case main body (10a) of the meter casing (10) is formed of a casting, and the above-mentioned inner communication holes (22a) and (21b) are formed by punching holes from above. . Therefore, the normal (conventional) inner communication holes (22a) and (21b) are formed to have a tapered shape for die-cutting, that is, to be reduced in diameter toward the measuring chamber. In other words, the inner communication holes (22
In a) and (21b), it is difficult to form the lower end into a divergent shape as in the present embodiment.

Therefore, in the present embodiment, the inner communication hole (22) in the inner peripheral portion of the case body (10a) is provided.
a) The periphery of the measuring chamber side end of (21b) is cut out in the front-rear direction or formed into a cutout shape by cutting, so that the measuring chamber side end of the inner communication holes (22a) and (21b) is formed. A divergent path (23) (2)
3) is formed.

As shown in FIG. 6, the partition wall (3) extends between the front first and second communication holes (21a) and (22a) and the rear first and second communication holes (21b) and (22b). An exhaust passage inlet (25a) is formed in the area, and an exhaust passage outlet (25a) is formed at an end of the pedestal (20).
b) are formed and these ports (25a) (25b)
The space is communicated with the exhaust passage (25).

As shown in FIG. 1, the exhaust passage outlet (25b) communicates with the gas outlet (7b) through the exhaust passage (6) of the meter casing (10).

As shown in FIGS. 2 and 7, the pedestal (2
The distributing member (30) screwed and fixed to (0) is made of a molded article of a hard synthetic resin such as polyacetal, and has four communication holes (21a) (22) of the meter body partition wall (3).
a) Corresponding to (21b) and (22b), four flow paths (3
1a), (32a), (31b), and (32b) are formed. The distribution member (30) further includes front first and second parts.
A front exhaust passage (35a) is formed between the passages (31a) and (32a), and a rear exhaust passage is formed between the rear first and second passages (31b) and (32b). A flow path (35b) is formed.

As shown in FIGS. 2 and 8, the distribution member (3
0), the front first and second flow paths (31a) (32)
a), a front valve (40a) is provided so as to be displaceable and movable between the first and second flow paths (31b) and (32).
A rear valve (40b) is provided so as to be displaceably movable between b) and (b).

Each of the valves (40a) and (40b) has an exhaust passage (35a) of the distribution member (30) at the center on the lower surface side.
A gas return recess (41) is provided corresponding to the opening shape of (35b), for example, a front valve (40).
a) is the gas return recess of the valve (40a) in a state where the gas return recess (41) is arranged at a position from the front first flow path (31a) to the front exhaust flow path (35a). The first flow path (31a) is configured to communicate with the front exhaust flow path (35a) via (41).
That is, when the valves (40a) and (40b) are displaced and moved, the space between the front first flow path (31a) and the front exhaust flow path (35a), and the front second flow path (32a) and the front exhaust gas are reduced. The flow paths (35a) alternately communicate with each other, and between the rear first flow path (31b) and the rear exhaust flow path (35b), and between the rear second flow path (32b) and the rear exhaust flow path (35b). And are communicated alternately.

On both sides of the gas return concave portion (41) on the lower surface side of each valve (40a) (40b), closed portions (42) (42) are provided. For example, in a state where the front valve (40a) has the gas return recess (41) adapted to the front exhaust passage (35a), the gas return recess (41) causes the exhaust passage (35a). Is closed, and the closing portions (42) (4)
According to 2), the front first and second flow paths (31a) (32)
a) is configured to be closed. Also, when the rear valve (40b) has the gas return recess (41) properly arranged in the rear exhaust passage (35b), the gas return recess (41) closes the exhaust passage (35b). At the same time, the rear first and second flow paths (31b) and (32b) are configured to be closed by the closing portions (42) and (42).

On the other hand, the blade shafts (56) and the valves (40a) (40b) are connected via a link mechanism (60) and the like, and the link mechanism (60) and the like are connected to a measuring unit. ing. Then, as will be described in detail later, the respective valves (40a) (40b) are displaced and moved in synchronization with the forward and backward movements of the respective measuring membranes (2a) (2b), and the respective measuring membranes (2a) (2b). It is configured such that the gas flow rate is measured by the measurement unit based on the number of forward and backward movements.

In this embodiment, the film plate (5
1), membrane plate (55), blade axis (56), swing arm (5)
7) and the link mechanism (60) constitute a power transmission mechanism (50).

In the gas meter according to the present embodiment, as shown in FIG. 9, when the front metering membrane (2a) is disposed at the front end position in the front metering space (1a), the front valve (40a) is used. The front first and second flow paths (31
a) (32a) and the front exhaust passage (35a) are closed. Furthermore, in the rear metering space (1b), the rear valve (40b) has its gas return recess (41).
Is the rear first flow path (31b) and the rear exhaust flow path (35b)
The rear first weighing chamber (11b) is disposed between the rear first exhaust chamber (11b) and the rear exhaust path (35b) through the rear first communication hole (21b) and the rear first flow path (31b). The second measuring chamber (12b) communicates with the upper space (5) via the rear second communication hole (22b) and the rear second flow path (32b).

Thus, the gas flowing into the upper space (5) from the gas inlet (7a) is supplied to the rear second flow path (32).
b) and through the rear second communication hole (22b) into the rear second metering chamber (12b), the gas pressure causes the rear metering membrane (2b) to move forward, and the membrane (2b) 1st weighing chamber (11b)
The gas inside passes through the rear first communication hole (21b), the rear first flow path (31b) and the rear exhaust flow path (35b), and further passes through the exhaust flow path (25), the exhaust path (6), and the gas outlet ( It is discharged through 7b).

At the time of this gas discharge, the rear first communication hole (21b) has a diverging path (23) at its measuring chamber side end.
The gas in the rear first metering chamber (11b) is smoothly guided into the communication hole (21b) along the inner peripheral surface of the divergent path (23), so that eddy currents and turbulent Efficiently discharges without generating. Therefore, the passage resistance is reduced, and the pressure loss is reduced.

Further, with the forward movement of the rear measuring membrane (2b), the valve (40) is transmitted through the power transmission mechanism (50).
a) (40b) is displaced and moved. Then, as shown in FIG. 10, when a predetermined amount of gas has flowed into the rear second measuring chamber (12b), the rear measuring membrane (2b) moves forward and the gas is discharged from the rear first measuring chamber (11b). Is completed, the rear valve (40b) closes the rear first and second flow paths (31b) (32b) and the rear exhaust flow path (35b). On the other hand, the front valve (40a) has a gas return recess (41) whose front second flow path (32a).
And a front second exhaust passage (35a).
The measuring chamber (12a) is connected to the front exhaust passage (35a) via the front second communication hole (22a) and the front second passage (32a).
And the front first weighing chamber (11a)
Front first communication hole (21a) and front first channel (31a)
Through the upper space (5).

Thus, the gas in the upper space (5)
Front first channel (31a) and front first communication hole (21a)
The gas in the front second measurement chamber (12a) is moved backward while the front measurement membrane (2a) is moved backward while flowing into the front first measurement chamber (11a) through the front second measurement chamber (11a). Communication hole (22
a), the front second flow path (32a) and the front exhaust flow path (35).
Discharged through a).

At the time of this gas discharge, the end of the front second communication hole (22a) is formed in the divergent path (23), so that the gas is efficiently and smoothly discharged as described above.

Further, with the rearward movement of the front measurement membrane (2a), the valve (40) is transmitted via the power transmission mechanism (50).
a) (40b) is displaced and moved, and as shown in FIG. 11, when a predetermined amount of gas has flowed into the front first measurement chamber (11a), the rear movement of the front measurement membrane (2a). The gas discharge from the front and rear second metering chambers (12a) is completed, and the front valve (40a) is connected to the front first and second flow paths (31a) (32).
a) and the front exhaust passage (35a) are closed. On the other hand, the rear valve (40b) is connected to the rear second flow path (32b).
And a rear second exhaust passage (35b).
The measuring chamber (12b) communicates with the rear exhaust flow path (35) through the rear second communication hole (32b) and the rear second flow path (32b), and the rear first measuring chamber (11b) is connected to the rear. It communicates with the upper space (5) through the first communication hole (21b) and the rear first flow path (31b).

Thus, the gas in the upper space (5)
Rear first channel (31b) and rear first communication hole (21b)
The rear measuring membrane (2b) is moved backward while flowing into the rear first measuring chamber (11b) through the rear second measuring chamber (11b).
The gas in the measuring chamber (12b) is supplied to the rear second communication hole (22).
b), the rear second flow path (32b) and the rear exhaust flow path (35).
discharged through b).

At the time of gas suction and discharge, the end of the rear first communication hole (21b) on the measuring chamber side is formed in the divergent path (23), so that the gas in the upper space (5) is allowed to pass through the rear first communication hole. When flowing into the rear first measuring chamber (11b) from the hole (21b), it is evenly distributed throughout the measuring chamber along the inner peripheral surface of the divergent path (23) in a well-balanced manner. The flow is efficiently and smoothly sucked without any flow.
Therefore, even during the gas suction, the passage resistance is reduced, and the pressure loss is reduced.

Further, with the rearward movement of the rear measuring membrane (2b), the valve (40) is transmitted via the power transmission mechanism (50).
a) When (40b) is displaced and moved, as shown in FIG. 12, when a predetermined amount of gas flows into the rear first measuring chamber (11b), the rear measuring membrane (2b) moves backward and rearward. When the gas discharge from the second measuring chamber (12b) is completed, the rear valve (40b) is connected to the rear first and second flow paths (31b) (3).
2b) and the rear exhaust passage (35b) are closed. On the other hand, the front valve (40b) is connected to the front first flow path (31).
a) and the front exhaust flow path (35a), the front first measurement chamber (11a) is arranged via the front first communication hole (21a) and the front first flow path (31a). Front exhaust passage (35
a) and the front second measuring chamber (12a).
The front second communication hole (22a) and the front second flow path (32
It communicates with the upper space (5) via a).

Thus, the gas in the upper space (5)
Front second flow path (32a) and front second communication hole (22a)
The gas in the front first measuring chamber (11a) is moved forward while the front measuring membrane (2a) is moved forward while flowing into the front second measuring chamber (12a) through the front. Communication hole (21
a), the front first flow path (31a) and the front exhaust flow path (35).
Discharged through a).

When the gas is sucked and discharged, the upper space (5)
When the gas inside flows into the front second measurement chamber (12a) from the front second communication hole (22a), the gas flows along the inner peripheral surface of the divergent path (23) throughout the measurement chamber. And is evenly and efficiently sucked.

As described above, in the gas meter according to the present embodiment, the measurement chambers (1) are moved by the movement of the front and rear measurement membranes (2a) and (2b) and the front and rear valves (40a) and (40b).
1a), (12a), (11b), and (12b), a predetermined amount of gas is selectively flowed in and out, and the reciprocating operation of the front and rear measurement membranes (2a) and (2b) is performed via the power transmission mechanism (50). Then, the gas flow rate is measured by the measuring unit based on the number of times the measuring film has moved.

As described above, according to the membrane gas meter of the present embodiment, the upper space (5) and the measuring chamber (12a) (1
1b), the ends of the communication holes (22a) and (21b) communicating with the weighing chamber are formed in the divergent paths (23) and (23), so that the weighing chambers (12a) and (11b) extend from the upper space (5). )
When the gas flows into the inside, the gas is divergent (23)
Is uniformly distributed in the entire measuring chamber along the inner peripheral surface of the sample, so that vortex and turbulent flow are not generated and the suction is efficiently and smoothly performed. Therefore, the passage resistance can be reduced, and the pressure loss can be reduced.

Further, even when gas is discharged from the measuring chambers (12a) and (11b), the measuring chambers (12a) and (11b)
The gas in b) is smoothly guided into the communication holes (22a) and (21b) along the inner peripheral surface of the divergent path (23), so that the gas is efficiently discharged without vortex or turbulent flow. . Therefore, passage resistance and pressure loss can be further reduced.

In this embodiment, the pressure loss can be sufficiently reduced simply by forming the end portions of the communication holes (22a) and (21b) in a divergent shape without making a significant improvement to the meter casing (10). Since it can be reduced, for example, an existing gas meter can be effectively used.

[0050]

As described above, according to the membrane gas meter of the present invention, since the end of the communication hole communicating the upper space and the predetermined measuring chamber at the measuring chamber side is formed in a divergent path, When the gas flows into the measuring chamber from the upper space, the gas is evenly distributed along the inner circumference of the divergent path throughout the measuring chamber in a well-balanced manner. It is sucked. Further, even when the gas is discharged from the measuring chamber, the gas in the entire measuring chamber is smoothly guided to the communication hole along the inner peripheral surface of the divergent path, and is efficiently discharged. As described above, the gas can be efficiently suctioned and discharged into and out of the measuring chamber, so that the passage resistance can be reduced and the pressure loss can be reduced. Further, the present invention can be easily realized only by forming the end of the communication hole in a divergent shape with respect to, for example, an existing membrane gas meter, and has an effect that the existing gas meter can be effectively used.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a membrane gas meter according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a measuring section of the gas meter of the embodiment.

FIG. 3 is a side view schematically showing a gas meter according to the embodiment with a lower portion cut away.

FIG. 4 is a front view showing a lower portion of the gas meter according to the embodiment with a front second measurement chamber opened.

FIG. 5 is a bottom view as viewed from the direction of arrow V in FIG. 4;

6A is a plan view showing a distribution member mounting base in the gas meter according to the embodiment, and FIG. 6B is a cross-sectional view taken along the line VI-VI of FIG.

7A and 7B are views showing a distribution member attached to the gas meter according to the embodiment, wherein FIG. 7A is a plan view and FIG.
Is a bottom view.

8A and 8B are views showing a valve attached to the gas meter of the embodiment, wherein FIG. 8A is a plan view, FIG. 8B is a sectional view taken along line VIII-VIII of FIG. 8A, and FIG. () Is a bottom view.

FIG. 9 is a schematic cross-sectional view illustrating a suction / discharge operation of the gas meter according to the embodiment.

FIG. 10 is a schematic cross-sectional view illustrating a suction and discharge operation of the gas meter according to the embodiment.

FIG. 11 is a schematic cross-sectional view illustrating a suction and discharge operation of the gas meter according to the embodiment.

FIG. 12 is a schematic cross-sectional view illustrating a suction / discharge operation of the gas meter according to the embodiment.

[Explanation of symbols]

 1a, 1b ... measuring space (lower space) 2a, 2b ... measuring film 3 ... upper and lower partition walls 5 ... upper space 7a ... gas inlet 7b ... gas outlet 10 ... meter casing 11a, 11b ... first measuring chamber 12a, 12b ... first 2 weighing chambers 21a, 22a, 21b, 22b ... communication holes 23 ... divergent path

 ────────────────────────────────────────────────── ─── Continued on the front page (71) Applicant 000116633 Aichi Watch Electric Co., Ltd. 1-2-70, Chitose, Atsuta-ku, Nagoya-shi, Aichi (72) Inventor Hiroshi Matsushita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Megumi Iwakawa 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Yama ▲ saki ▼ Yu 10 Kagida-cho, Chudo-ji, Shimogyo-ku, Kyoto Kansai Gasme (72) Inventor Toshifumi Matsuda 10 Kanodaji Kadamachi, Shimogyo-ku, Kyoto-shi Kansai Gasmeter Inc. (72) Inventor Takaaki Yoshida 10 Nakadoji-Kida-cho, Shimogyo-ku, Kyoto Kansai Gasmeter Co., Ltd. (72) Inventor Akio Yoshinaga 4-7-13-Nishiiwata, Higashiosaka-shi, Osaka Inside Kansai Research Laboratory, Kinmon Manufacturing Co., Ltd. (72) Inventor Shinichi Tomoe Nagoya, Aichi Prefecture 1-70, Atsuta-ku, Aichi-shi, Aichi Clock & Electronics Co., Ltd. (72) Inventor Katsuhisa Hanaki 2-70, Atsuta-ku, Nagoya-shi, Aichi F-term (reference) 2F030 CC13 CH05

Claims (2)

[Claims] 1. The meter casing is partitioned into a lower space and an upper space by a partition wall, and first and second measuring chambers separated by a measuring film are provided in the lower space, while gas is provided above the meter casing. An inlet and a gas outlet are provided, and the partition wall is provided with a communication hole communicating between the measuring chamber and the upper space corresponding to the first and second measuring chambers, respectively; The gas flowing into the upper space from is selectively introduced into the first and second measuring chambers through the corresponding communication holes, and the gas in the first and second measuring chambers corresponds to the gas. In a membrane gas meter selectively discharged through the communication hole and allowed to flow out of the gas outlet, the measuring chamber side end of at least one communication hole in the partition wall is a measuring chamber. Membrane type gas meter characterized by comprising formed on divergent paths gradually increases in diameter toward. 2. The lower space has a front measuring space and a rear measuring space, and the first and second measuring chambers are respectively formed in these measuring spaces. 2. The membrane according to claim 1, wherein the communication hole is formed, and the divergent path is formed in the communication hole corresponding to an inner measurement chamber among the first and second measurement chambers of each of the measurement spaces. 3. Gas meter.