JPH1151723A - Gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the inner wall of a gas transmission passage clean even if it is used over a long period of time, and enable accurate measuring of a gas flow rate by disposing the gas transmission passage whose longitudinal direction is inclined to the horizontal direction. SOLUTION: With regard to the gas meter, gas 100 is introduced from an introduction inlet 105 to a first chamber 101 to pass it in a gas transmission passage 108, and delivered from a delivery outlet via a second chamber 102. At this time, flow velocity of passing gas 100 is measured to calculate a flow rate by an ultrasonic transmitter/receiver 111, 112. In the case where the gas meter is used, the center line 110 of the longitudinal direction of the gas transmission passage 108 is inclined at an angle of β to the horizontal direction 200 to dispose the gas transmission passage 108. The angle of β is set in 5-85 degrees in which impurity in which dew condensation is supposed, mainly water can flow down. Water 201 stayed in the bottom part of the second chamber 102 is drained from an drainage outlet 301. Thereby the inner wall of the gas transmission passage 108 can be always kept clean.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas meter.

[0002]

2. Description of the Related Art Gas meters can be roughly classified into two types: a guess type and a volume measurement type. As a gas meter that has been widely and conventionally used, there is a gas meter of a membrane type.The gas meter of the membrane type has a membrane that repeats vibration by the pressure of a gas flow inside a housing of the gas meter. It is a so-called meter that uses a mechanical operation to measure the flow rate of gas in response to vibration. Due to its simple and practical structure and high durability, it has been widely used.

[0003] However, such a conventional gas meter of the membrane type has a disadvantage that it is difficult to adapt to recent digitization of the gas meter due to the characteristic of being a mechanical type as described above. On the other hand, various other types of gas meters have been devised, and some of them are actually used. In particular, in recent years, physical values of gas as a fluid have been measured, and corresponding to the measured values. A so-called guess-type gas meter that calculates a numerical value of a gas flow rate has attracted attention.

That is, since the gas meter of the guess type handles the numerical value of the gas flow rate as a digital signal from the measurement stage, the gas flow rate value can be transmitted, processed, and stored as digital data even after the measurement. Therefore, it has the characteristic of being very well adapted to such a system for performing data management and the like, and is attracting attention as a particularly suitable technique for a gas meter which has recently been digitized.

Such an inferential gas meter measures the number of revolutions of a turbine caused by a gas flow using a device such as a rotary encoder, based on an ultrasonic measurement method using a propagation time difference between ultrasonic waves, and uses the measured value as a basis. Such as a turbine measurement method that calculates the value of the gas flow rate using a pressure difference method using a pressure difference between two points caused by a gas flow.
Several types of methods have been proposed, all of which have been attracting attention as being capable of accurately measuring the flow rate of gas with a continuous value.

[0006] Among them, the ultrasonic measurement method is particularly known as a technique capable of accurately measuring a flow rate while having a small and simple structure. Ultrasonic gas meter
As shown in FIG. 5, an outline of the structure is shown. A partition 503 that divides an airtight chamber formed in an airtight structure into two chambers, a first chamber 501 and a second chamber 502, and an upstream gas pipe 50.
4, an inlet 506 for introducing the gas 505 into the first chamber 501, and an outlet 5 connected to the downstream gas pipe 507 for sending the gas 505 from the second chamber 502.
08, a cylindrical gas passage 509 passing through the partition 503 and passing the gas 505 from the first chamber 501 to the second chamber 502, and a gas passing through the gas passage 509. In order to measure the flow velocity of the gas 505 and calculate the flow rate of the gas 505 based on the value of the flow velocity, the ultrasonic oscillating / receiving 510, which is disposed opposite to the gas flow in a predetermined length in a direction parallel to the gas flow. From 511, the main part is formed.

[0007] The gas meter of the ultrasonic measurement system can accurately measure the gas flow rate with such a relatively simple structure.

[0008]

However, when the above-described gas meter is actually installed and the gas is pressurized and used, the gas generally contains water and other impurities during the gas production. Impurities such as dust and oil-based impurities generated in a petroleum refining process are inevitably contained.

[0009] These impurities are supplied to the gas meter through the gas pipe 504 when the gas 505 is pressurized and the first gas is supplied to the gas meter.
When entering the chamber 501, when passing through the gas passage 509, it is accelerated to a flow velocity corresponding to the cross-sectional area of the gas passage 509, and the pressure decreases. The flow rate at this time is the above-mentioned ultrasonic emission /
In order to calculate the flow rate of the gas 505 by the geophones 510 and 511, the gas 505 is required to have a relatively high flow rate, so that the gas 505 is generally accelerated here. Therefore, the pressure of the gas 505 decreases when passing through the gas passage 509, and as a result, on the inner wall of the gas passage 509, the above-mentioned moisture and oil-based impurities contained in the gas 505 are condensed. Or stick.

The moisture or oil-based impurities once condensed or condensed are further absorbed by the gas flow, such as dust mixed in the gas flow, due to the suction force at the interface. And oil and fat impurities. In this way, while the gas meter has been in use for many years, the gas 50
The impurities and the like contained in 5 become sludge-like and accumulate, and the inner diameter of the gas passage 509 gradually decreases,
Further, the flow velocity of the gas 505 deviates from the initial pure state due to friction against the gas flow on the surface of the deposition of the impurities and the like. As a result, there is a problem that accurate measurement of the gas flow rate cannot be performed.

[0011] Further, moisture and oil-based impurities are condensed or adhered, and accumulate particularly in the ultrasonic oscillator / vibrator 511 arranged below the gas passage 509, and the ultrasonic oscillator / vibrator 511 itself is formed. There is also a problem that the malfunction of the device and its ultrasonic detection function are adversely affected.

In order to avoid such an inconvenience, a filter for removing impurities such as dust, moisture and oil-based impurities contained in the gas 505 is provided around the gas pipe 504 on the upstream side of the gas meter. Although it is conceivable to attach it to a computer, it is not practical because of many disadvantages. That is, especially in a general residential gas meter in which the above-described method is used, the gas meter is required to have a simple structure, a small size, and a low cost. The provision of filters that increase and are costly is practically undesirable.

In addition, dust and water droplets can be removed by a relatively coarse filter. However, moisture and oil-based impurities contained in the gas 505 in an unsaturated vapor state are removed by the filter. It is not easy to do so, and conversely, the provision of such a filter causes a resistance of the gas flow to the filter, resulting in a disadvantage that the gas pressure downstream of the filter decreases. . In a gas meter whose pressure is specified, it is extremely inconvenient to provide a filter in view of such a pressure drop of the gas 505.

As described above, in practice, a gas containing impurities such as dust, moisture, and oil-based impurities must be directly supplied to the gas meter. The impurities and the like contained in 505 become sludge and accumulate, and as a result, there is a problem that accurate measurement of the gas flow rate cannot be performed.

The present invention has been made to solve such a problem. The present invention solves the conventional problem that impurities and the like contained in the gas 505 are deposited in the form of sludge on the inner wall of the gas passage 509 by a simple method without causing a complicated structure and high cost. Is resolved by
An object of the present invention is to realize a gas meter capable of accurately measuring a gas flow rate by keeping the inner wall of the gas passage 509 clean even after long-term use.

[0016]

First, a gas meter according to the present invention comprises an airtight chamber formed in an airtight structure, and two airtight chambers.
A partition wall divided into two first chambers and a second chamber, an inlet connected to an upstream gas pipe to introduce gas into the first chamber, and a second gas chamber connected to a downstream gas pipe and connected to the second chamber. An outlet for delivering gas, a cylindrical gas passage that is arranged to penetrate the partition wall, and allows a gas fluid to pass from the first chamber to the second chamber; and a gas that passes through the gas passage. A gas flow rate calculating means for calculating a flow rate of the gas by measuring a flow velocity of the gas, wherein a longitudinal direction of the gas conducting path is inclined with respect to a horizontal direction when a gas meter having the gas conducting path is used. The gas meter is characterized in that the gas passage is arranged so as to perform the above operation.

By arranging the gas passage in such a manner as to be inclined with respect to the horizontal direction, moisture, grease-based impurities, dust or the like which is likely to be condensed or adhered to the gas passage is removed with time. Before the hardening or deposition, the gravity acting on the inclined surface allows the gas to be positively dropped to the lower side in the longitudinal direction of the inclination of the gas passage.

At this time, particularly for fat-based impurities,
Due to the nature of oils and fats, the viscosity is still relatively small at the time of dew condensation or adhesion in the gas passage, and in most cases, it hardens as the time elapses after the dew or adhesion. Therefore, when the oil-based impurities and the like adhere to the gas passage, the viscosity is still small, so that when the oil-based impurities easily flow, the oil-based impurities and the like can be quickly washed away by the technique of the present invention. According to the present invention, even fat-and-oil-based impurities which are considered to be difficult to remove after curing can be effectively washed off.

According to the present invention, water having a low viscosity can be quickly washed away before dust and the like adhere and mix with the water to form sludge. here,
For a more specific angle of the inclination, in the case of city gas, which is considered to be the most demanded gas meter, LNG
(Liquefied natural gas) is mainly used, so it contains little oil and fat impurities and contains a lot of water. If this water is taken as a standard, the water condensed on the wall of the gas passage is effectively removed. In order to make the gas flow down, it is desirable that the angle formed between the longitudinal center line of the gas passage and the horizontal direction is 5 degrees or more.

In this case, it is needless to say that the maximum angle at which the gravitational force works most effectively is 90 degrees. However, at 90 degrees, the gas conduction path does not penetrate the partition wall. Therefore, the maximum angle may be a practical maximum angle within a range in which the gas passage passes through the partition wall. On the other hand, with respect to the above minimum angle, in the case of water, even if it is 5 degrees or more, it flows even at an inclination, but impurities included in the gas and condensing or adhering to the wall surface of the gas passage are other than water. There are various substances having different viscosities such as oil-based impurities. For example, liquefied petroleum gas such as propane gas, which is often used in the suburbs of cities, etc., and butane gas, which is used as a fuel for powering vehicles, is an accompanying gas generated in a petroleum refining process and a petroleum mining process. Contains a lot. Therefore, also in the case of a gas meter used for such a kind of gas, by using the same operation as above, the fat-based impurities can be effectively drained off by gravity immediately after dew or adhere to the wall of the gas passage. The gas passage may be inclined at such an angle.

Accordingly, the present invention secondly provides the gas meter according to the first aspect, wherein impurities generated in accordance with the type of gas flowing through the gas meter and adhered to the gas passage are removed from the gas passage in the gas passage. The gas meter is characterized in that the gas passage is inclined at an angle at which the gas passage is dropped below a slope of the gas passage against a viscous adhesion force to a wall surface. Here, if the angle at which the type of impurity having the strongest viscous adhesive force can be flowed off is set, the other types of impurities can be more easily flowed off. May be determined according to the strongest type of impurity.

Thirdly, according to the present invention, in the gas meter according to the first or second aspect, the end of the gas passage which is located downstream of the gas passage is located on the upstream side of the second chamber. The gas meter is characterized in that the gas meter is a gas passage that is arranged to be inclined so as to be lower than an end of the first chamber.

That is, by setting the end of the gas flow path on the downstream side of the gas flow to the lower side of the slope, impurities condensed or adhered to the wall surface of the gas flow path are caused to flow down by gravity acting on the slope. Not only that, the gas flow through the gas passage can be made to flow down more strongly and effectively downward by the wind pressure of the gas flow itself. This makes it possible to more effectively remove impurities by flowing down from the wall of the gas passage.

Fourth, the gas meter according to the present invention has the first
4. The gas meter according to any one of claims 1 to 3, wherein the gas is generated in accordance with the type of gas flowing through the gas meter, adheres to the gas passage, and falls further downward from an end of the gas passage due to the inclination of the gas passage. And the second chamber or the first
The outlet for discharging impurities accumulated at the bottom of the chamber is provided in the second
A chamber or a bottom of the first chamber.

That is, as described in the first to third aspects, according to the present invention, impurities and dust condensed or adhered to the wall surface of the gas passage pass down the slope of the gas passage and eventually fall. At the bottom of the second chamber or the first chamber. However, if the volume of the second chamber or the first chamber has only a small volume due to the small size and thinness of the gas meter, the gas passage may be blocked by accumulated water or impurities. Is also conceivable. Therefore, in order to avoid inconvenience that may occur in the case of a gas meter having such an extremely small volume, the second chamber or the first chamber as described above is used.
An outlet for discharging impurities accumulated at the bottom of the chamber may be provided. The outlet may be provided at one location at the bottom of the first or second chamber, or at a plurality of locations. Further, the shape of the discharge port may be formed in a small hole shape, or may be formed in a lid shape. In any case, it is needless to say that the size, the shape, and the number are such that impurities, dust, and the like accumulated at the bottom of the airtight chamber can be effectively discharged.

Fifth, the gas meter according to the present invention has the first
The gas meter according to any one of claims 1 to 4, wherein the gas conducting path is disposed at a position higher than a height of an impurity that is assumed to accumulate at the bottom of the hermetic chamber during a service life of the gas meter. Features.

That is, the technique described in the fourth aspect is a technique for solving the problem that the gas meter itself becomes full of impurities accumulated due to a small volume or the like. According to the technology, regardless of the size of the gas meter, it is possible to prevent the inconvenience that impurities such as water accumulate during the years of use and reach the height of the gas passage and impair the function of the gas passage. In order to
Placing the gas conduit at a position higher than the maximum height at which the impurities are expected to accumulate during the life of the gas meter,
In other words, the gas conduction path is arranged at a high position so as to avoid impurities that are assumed to accumulate in advance.
Thereby, accurate measurement of the gas flow rate can be always maintained until the life of the gas meter.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the gas meter according to the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view (a) showing an outline of the internal structure of a gas meter according to a first embodiment of the present invention, and a pair of ultrasonic transmitters / receivers are arranged by a Z method. It is sectional drawing (b) which showed the internal structure of the gas meter of 1st Embodiment from the diagonally left upper viewpoint.

The gas meter according to the first embodiment is formed assuming a gas meter used for city gas. This gas meter is connected to an upstream gas pipe 104 and a partition 103 for dividing an airtight chamber formed in an airtight structure into two chambers, that is, a first chamber 101 and a second chamber 102. 100, an outlet 107 connected to a gas pipe 106 on the downstream side to send out the gas 100 from the second chamber 102, and an outlet 107 penetrating the partition 103, and the first chamber The gas 1 flows from 101 to the second chamber 102.
The gas flow rate for calculating the flow rate of the gas 100 is provided with a cylindrical gas flow path 108 through which the gas 100 flows, and ultrasonic transmitters / receivers 111 and 112 for measuring the flow velocity of the gas 100 passing through the gas flow path 108. Having the calculation means 109 is the same as the conventional gas meter.

In such a gas meter, when the gas meter is used, the longitudinal direction of the gas passage 108, that is, the center line 110 in the longitudinal direction of the gas passage 108 is inclined with respect to the horizontal direction 200. Thus, the gas meter is characterized in that the gas passage 108 is arranged obliquely.

Further, a discharge port 301 for discharging the water 201 and an airtight lid 302 mainly discharging the water 201 in the present embodiment are provided at the bottom of the second chamber 102. . Thereby, even if impurities, that is, water 201 in this case, accumulate, the accumulated water 201 is discharged to the discharge port 301 at the time of, for example, a periodic inspection of a gas meter.
Can be discharged from

Generally, the gas meter is installed at the installation place in a state of being upright as shown in FIG. 1 (a), so that the partition wall 103 is formed so as to be substantially upright with respect to the horizontal direction on the ground. The gas passage 1
The angle β formed between the longitudinal center line 110 and the horizontal direction 200 at 08 is substantially equal to the complementary angle of the angle formed between the longitudinal center line 110 of the gas passage 108 and the partition wall 103. Accordingly, the angle β formed between the longitudinal center line 110 of the gas passage 108 and the horizontal direction 200, that is, the inclination angle β at which the gas passage 108 is inclined with respect to the horizontal direction 200.
May actually be set as a complementary angle of the inclination angle at which the gas passage 108 is arranged to be inclined with respect to the partition wall 103. In other words, the gas passage 108 may be arranged at an angle (90-β) degrees with respect to the partition 103.

As the angle β, in the present embodiment, since a gas meter for city gas is assumed, most of the impurities which are assumed to be condensed or condensed are water. The inventor of the present invention has confirmed from various experiments that the angle may be set to an angle between 5 degrees and 85 degrees, which is a possible angle. Note that the upper limit of 85 degrees is a value actually calculated as the maximum angle at which the gas passage 108 can be disposed so as to penetrate the partition 103.

The ultrasonic transmitters / receivers 111 and 112 are the same as those shown in FIG.
As shown in (b), in order to emit ultrasonic waves obliquely to the flow of the gas 100, a line 2 connecting them is used.
02 is opposed to the longitudinal center line 110 of the gas passage 108 at an angle α, that is, a so-called Z
They are arranged in an arrangement method called the law. These ultrasonic transmitters / receivers 111 and 112 are connected to the gas passage 10.
8, the water flowing down due to condensation on the inner wall surface of the gas passage 108 can be prevented from accumulating in the depression.

However, here, the ultrasonic transmitter / receiver 11, 1
In the case of a structure in which 12 protrudes in the lateral direction as shown in FIG. 1B, it is inevitable that the lateral dimension increases due to the protrusion. By the way, gas meters for houses are generally required to be smaller or thinner.In particular, from the viewpoint of the appearance of houses and architectural design, such instruments do not protrude as much as possible from the building wall at the installation site. Preferably, it is thin. Therefore, from the viewpoint of such a reduction in thickness, the projections of the ultrasonic oscillators / vibrators 111 and 112 are made to protrude vertically in the gas-tight room of the gas meter, which has a relatively large space. This is preferable because it can be converted to However, the projections of the ultrasonic oscillators / vibrators 111 and 112 are set to the
08, the water flowing down the wall surface inside the gas passage 108 is generated by the ultrasonic transmitter / receiver 111,
There is a possibility that it may flow into 112. Therefore,
In such a case, as shown in FIG.
08 and the ultrasonic transmitter / receiver 11
The reference numerals 1 and 112 may also be arranged slightly shifted from the horizontal direction 200. That is, as shown in FIG. 2, the gas passage 108 is arranged obliquely, and the ultrasonic transmitter / receiver 11
By arranging the ultrasonic transmitters / receivers 111 and 112 so that the center line connecting them to the horizontal direction slightly deviates from the horizontal direction, the water 201 is prevented from flowing into them as schematically shown in FIG. be able to.

(Embodiment 2) FIG. 3 shows a second embodiment according to the present invention.
It is a figure showing the outline of the structure of the gas meter of an embodiment.
In the gas meter of the second embodiment, first,
The ultrasonic oscillator 111 and the ultrasonic transmitter / receiver 112
The difference from the first embodiment is that the gas passage 108 is disposed at both ends of the gas passage 108 at a small distance from the gas passage 108. Thus, the ultrasonic transmitter / receiver 111, 1
The technology according to the present invention can also be applied to a case where 12 are arranged in an arrangement method other than the Z-method arrangement.

The second difference is that the gas passage 108
However, the difference from the first embodiment is that the gas passage 108 is inclined at an angle β ′ steeper than the gas passage 108 of the first embodiment. The reason why the gas meter according to the second embodiment is a gas meter used as a propane gas meter instead of a city gas meter is that the gas meter of the second embodiment is inclined at such a steep angle β ′. The gas of such refined petroleum products contains oil-based impurities having higher viscosity than water. In order to flow the oil-based impurities so as not to adhere to the inner wall of the gas passage 108, the gas must be able to resist the viscous adhesion force. This is because a strong downward slope force is required.

A third difference is that, in the present embodiment, the gas passage 108 is disposed at a considerably higher position in the airtight chamber, and the lower end of the gas passage 108 and the second chamber 10
There is a considerable space between the bottom of the two. Therefore, even if this gas meter is continuously used until the end of its service life, and impurities and the like flow down and accumulate from the gas passage 108 to the bottom of the second chamber 102 during that time, the upper surface reaches the gas passage 108. Reaching and causing inconvenience is virtually impossible. Others are formed in the same structure as the above embodiment.

In each of the above embodiments, the gas passage 108 is arranged such that the end of the gas passage 108 on the second chamber 102 side is located lower than the end on the opposite side.
However, it is needless to say that, on the contrary, the gas passage 108 on the first chamber 101 side may be inclined so that the end of the gas passage 108 is located below. However, in this case, since the impurities and dust flow in the opposite direction to the gas flow, it is impossible to utilize the wind pressure of the flow of the gas flow itself. Needless to say, this may be done if it is not necessary.

Further, in each of the above embodiments, the case of a guess-type gas meter using an ultrasonic measuring means has been described, but the application of the technology of the present invention is not limited to such an ultrasonic measuring method. It is not limited only to the case. In addition, it goes without saying that the present invention can be applied to a gas meter using the above-described cylindrical gas passage 108.

Also, in each of the above embodiments, the gas passage 108 has a circular cross section, that is, a cylindrical shape (a so-called tube) as an example of a general shape. Needless to say, the invention is not limited to this. Besides this,
For example, a cylindrical gas passage having a hexagonal cross section may be used.
Alternatively, the present invention can also be applied to a gas meter using a gas passage 401 having a shape in which the inner diameter of the gas passage changes in the longitudinal direction, for example, a shape as shown in FIG.

Alternatively, in the above embodiment, the case where the ultrasonic wave is unidirectionally propagated from the ultrasonic wave transmitter / receiver 111 to the ultrasonic transmitter / receiver 112 has been described.
Ultrasonic transmitter / receiver 111 and ultrasonic transmitter / receiver 112
Have both a function of transmitting and receiving an ultrasonic wave, and at this time, the ultrasonic transmitter / receiver 111
The propagation time T1 of the ultrasonic wave propagated from the side to the ultrasonic wave transmitter / receiver 112 side, and conversely, the ultrasonic wave propagated from the ultrasonic wave transmitter / receiver 112 side to the ultrasonic wave transmitter / receiver 111 side Is measured and the difference ΔT = T1−T1 between the two is measured.
The technique according to the present invention described above is also applicable to a case where a method of calculating T2 and calculating a gas flow rate based on ΔT is adopted.

It is preferable that the material of the gas conducting path 108 is a material having an interface characteristic that makes it difficult for various impurities, dusts, etc., such as the above-mentioned dew condensation of moisture and oil-based impurities, to adhere to the surface. Needless to say.

[0044]

As described above in detail, according to the present invention, the conventional problem that impurities and the like contained in gas accumulate in the form of sludge on the inner wall of the gas passage. A gas meter that eliminates the complexity of the structure and raises costs by a simple method without causing any problems and keeps the inner wall of the gas passage clean even after many years of use. Can be realized.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view schematically showing the structure of a gas meter according to a first embodiment of the present invention, and FIG. It is a top view (b) showing the internal structure of the gas meter of one embodiment.

FIG. 2 shows a gas passage 108 arranged at an angle,
FIG. 3 is a diagram showing a case where ultrasonic transmitters / receivers 111 and 112 are also arranged slightly shifted from the horizontal direction 200.

FIG. 3 is a diagram showing an outline of the structure of a gas meter according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an example of a gas passage having a shape such that the inner diameter of the gas passage changes in the longitudinal direction.

FIG. 5 is a diagram showing an outline of an internal structure of a conventional gas meter of an ultrasonic measurement system.

[Explanation of symbols]

101: first chamber, 102: second chamber, 103: partition, 10
4: gas pipe, 105: inlet, 106: gas pipe, 1
07 ... Outlet, 108 ... Gas conducting path, 109 ... Gas flow rate calculating means, 110 ... Longitudinal center line of the gas conducting path, 11
1,112: ultrasonic transmitter / receiver, 200: horizontal direction, 2
01 ... water

Claims (5)

[Claims] An airtight chamber formed in an airtight structure, a partition for dividing the airtight chamber into two chambers, a first chamber and a second chamber,
An inlet connected to an upstream gas pipe for introducing gas into the first chamber; and a second port connected to a downstream gas pipe for introducing the gas.
A gas outlet from which the gas is delivered from the chamber, and a cylindrical gas passage which is arranged to penetrate the partition wall and allows a gas fluid to pass from the first chamber to the second chamber, and which passes through the gas passage. A gas flow rate calculating means for measuring a flow rate of the gas to be calculated and calculating a flow rate of the gas, wherein a longitudinal direction of the gas flow path is horizontal with respect to a horizontal direction when the gas meter having the gas flow path is used. The gas meter is characterized in that the gas conducting path is arranged so that is inclined. 2. The gas meter according to claim 1, wherein impurities generated in accordance with the type of gas flowing through the gas meter and adhered to the gas passage are converted into a viscous adhesion force of the impurity to a wall surface of the gas passage. The gas meter according to claim 1, wherein the gas conducting path is inclined with respect to a horizontal direction at an angle at which the gas conducting path falls below the inclination of the gas conducting path. 3. The gas meter according to claim 1, wherein the gas passage is inclined so that a downstream end of the gas passage is lower than an upstream end of the gas passage. A gas meter, which is a conduction path. 4. The gas meter according to claim 1, wherein the gas is generated in accordance with a type of gas flowing through the gas meter, adheres to the gas passage, and has an end portion of the gas passage due to inclination of the gas passage. Falls further down from the second
A gas meter, further comprising a discharge port for discharging impurities accumulated at a bottom of the chamber or the first chamber, at a bottom of the second chamber or the first chamber. 5. The gas meter according to claim 1, wherein the gas passage is located at a position higher than a height of an impurity that is assumed to accumulate at a bottom of the airtight chamber during a service life of the gas meter. A gas meter, which is arranged.