JP2003302275A - Ultrasonic gas meter - Google Patents
Ultrasonic gas meterInfo
- Publication number
- JP2003302275A JP2003302275A JP2002109291A JP2002109291A JP2003302275A JP 2003302275 A JP2003302275 A JP 2003302275A JP 2002109291 A JP2002109291 A JP 2002109291A JP 2002109291 A JP2002109291 A JP 2002109291A JP 2003302275 A JP2003302275 A JP 2003302275A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- passage
- ultrasonic
- measurement
- gas meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、一般家庭用の超
音波ガスメータに関する。TECHNICAL FIELD The present invention relates to an ultrasonic gas meter for general household use.
【０００２】[0002]
【従来の技術】一般家庭用のガスメータとしての超音波
ガスメータは、既設の膜式ガスメータが取付けられてい
る配管に対して互換性を持たせるために図２に示すよう
に構成されている。2. Description of the Related Art An ultrasonic gas meter as a gas meter for general households is constructed as shown in FIG. 2 in order to make it compatible with a pipe to which an existing membrane gas meter is attached.
【０００３】すなわち、ガスメータ本体１の上部には左
右方向に離間してガス流入口３ａを形成する流入口金３
とガス流出口４ａを形成する流出口金４が設けられてい
る。That is, in the upper portion of the gas meter main body 1, there is an inlet metal 3 forming a gas inlet 3a spaced apart in the left-right direction.
And an outlet gold 4 forming a gas outlet 4a.
【０００４】ガスメータ本体１の内部にはガスの流入通
路５と流出通路６が平行に、しかも上下方向に貫通して
設けられ、流入通路５と流出通路６の上端はそれぞれパ
ッキング７，８を介して流入口金３と流出口金４に接続
されている。さらに、流入通路５と流出通路６の下端は
それぞれパッキング９，１０を介して計測部本体１１と
接続されている。A gas inflow passage 5 and an outflow passage 6 are provided in the gas meter main body 1 in parallel with each other and penetrate vertically, and the upper ends of the inflow passage 5 and the outflow passage 6 are provided with packings 7 and 8 respectively. Is connected to the inlet gold 3 and the outlet gold 4. Further, the lower ends of the inflow passage 5 and the outflow passage 6 are connected to the measuring unit main body 11 via packings 9 and 10, respectively.
【０００５】計測部本体１１には流入通路５と流出通路
６と直角方向、つまり水平方向に計測流路１２が設けら
れている。この計測流路１２の上流側は略Ｌ字状の屈曲
通路１３を介して流入通路５と連通し、この計測流路１
２の下流側は略Ｌ字状の屈曲通路１４を介して流出通路
６と連通している。The measuring section main body 11 is provided with a measuring flow path 12 in a direction perpendicular to the inflow passage 5 and the outflow passage 6, that is, in the horizontal direction. The upstream side of the measurement flow path 12 communicates with the inflow path 5 through a substantially L-shaped bent path 13, and the measurement flow path 1
The downstream side of 2 communicates with the outflow passage 6 through a substantially L-shaped bent passage 14.
【０００６】計測流路１２にはガスの流れる方向（矢印
ａ方向）に対して角度θを持って対向する一対の超音波
センサ１５，１６が設置されている。さらに、計測流路
１２の上流側には格子状の整流フィルタ１７が設けられ
ている。また、ガスメータ本体１の開口部１２は底部カ
バー１８によって閉塞されている。The measurement flow path 12 is provided with a pair of ultrasonic sensors 15 and 16 facing each other at an angle θ with respect to the gas flow direction (direction of arrow a). Furthermore, a grid-shaped rectifying filter 17 is provided on the upstream side of the measurement flow path 12. The opening 12 of the gas meter body 1 is closed by a bottom cover 18.
【０００７】前述のように構成された超音波ガスメータ
は、ガス供給源から配管を介して供給されたガスはガス
流入口３ａから流入通路５に流入し、流入通路５から屈
曲通路１３によって略直角に曲がって整流フィルタ１７
を通過する。このとき、ガスの流速分布の乱れは整流フ
ィルタ１７によって整流され、整流されたガスは計測流
路１２を流れる。このとき、超音波センサ１５，１６に
よって超音波の伝搬速度の変化を検知してガス流量を計
測し、積算流量を積算指示部（図示しない）に指示す
る。計測流路１２で計測されたガスは屈曲通路１４から
流出通路６を介してガス流出口４ａに向かい、配管を介
してガス需要側へ流れる。In the ultrasonic gas meter constructed as described above, the gas supplied from the gas supply source through the pipe flows into the inflow passage 5 from the gas inflow port 3a, and is bent at a substantially right angle from the inflow passage 5 by the curved passage 13. Bent to the rectifying filter 17
Pass through. At this time, the disturbance of the flow velocity distribution of the gas is rectified by the rectification filter 17, and the rectified gas flows through the measurement flow path 12. At this time, the ultrasonic sensors 15 and 16 detect changes in the propagation velocity of the ultrasonic waves to measure the gas flow rate, and indicate the integrated flow rate to an integration instruction unit (not shown). The gas measured in the measurement flow path 12 flows from the bent passage 14 to the gas outlet 4a via the outflow passage 6 and flows to the gas demand side via the pipe.
【０００８】[0008]
【発明が解決しようとする課題】前述したように、超音
波ガスメータは、計測流路に設けられた超音波センサに
よってガスの流速を計測しているため、計測流路内にお
ける流速分布の平均化が測定精度に影響する。流速分布
を平均化するためには、計測流路を真直ぐで、長くする
ことで解決されるが、ガスメータが大型化し、特に一般
家庭用においては小型化が要求されており、計測流路を
真直ぐで、長くすることはできない。As described above, since the ultrasonic gas meter measures the gas flow velocity by the ultrasonic sensor provided in the measurement flow passage, the flow velocity distribution in the measurement flow passage is averaged. Affects the measurement accuracy. In order to average the flow velocity distribution, it can be solved by straightening and lengthening the measurement flow path, but the gas meter becomes large, and miniaturization is required especially for general household use, and the measurement flow path should be straightened. So you can't make it longer.
【０００９】そこで、従来においては、計測流路の上流
側に整流フィルタを設けているが、計測流路の上流側の
屈曲通路を通過するガスの流速分布の乱れを十分に除去
することができず、計測精度に影響を及ぼしている。Therefore, in the past, a rectifying filter was provided on the upstream side of the measurement flow path, but it is possible to sufficiently remove the disturbance in the flow velocity distribution of the gas passing through the curved passage on the upstream side of the measurement flow path. However, it affects the measurement accuracy.
【００１０】この発明は、前記事情に着目してなされた
もので、その目的とするところは、計測流路の上流側に
屈曲通路を有していてもガスの流速分布に及ぼす影響を
低減することができ、計測精度を向上できる超音波ガス
メータを提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to reduce the influence on the gas flow velocity distribution even if a curved passage is provided on the upstream side of the measurement flow passage. It is possible to provide an ultrasonic gas meter that can improve the measurement accuracy.
【００１１】[0011]
【課題を解決するための手段】この発明は、前記目的を
達成するために、請求項１は、ガス流入口から流入する
ガスを流入通路から計測流路に流入し、前記計測流路に
設置した超音波センサによって超音波の伝搬速度の変化
を検知してガス流量を計測する超音波ガスメータにおい
て、前記計測流路の上流側に整流フィルタを設けるとと
もに、この整流フィルタのさらに上流側に略Ｓ字状のガ
ス流通路を設けたことを特徴とする。According to the present invention, in order to achieve the above object, a first aspect of the present invention is to install a gas flowing from a gas inlet into a measurement flow passage from an inflow passage and to install the gas in the measurement flow passage. In the ultrasonic gas meter that measures the gas flow rate by detecting the change in the propagation velocity of the ultrasonic wave by the ultrasonic sensor described above, a rectifying filter is provided on the upstream side of the measurement flow path, and substantially S on the upstream side of the rectifying filter. A character-shaped gas flow passage is provided.
【００１２】請求項２は、請求項１の前記ガス流通路
は、前記計測流路の上流側に設けられた略Ｌ字状の屈曲
通路と、前記流入通路の内部に設けられ前記屈曲通路と
逆方向に略Ｌ字状に屈曲する屈曲管路とを接続して形成
されていることを特徴とする。According to a second aspect of the present invention, the gas flow passage according to the first aspect is a substantially L-shaped curved passage provided upstream of the measurement flow passage, and the curved passage provided inside the inflow passage. It is characterized in that it is formed by connecting with a bending conduit which is bent in a substantially L shape in the opposite direction.
【００１３】請求項３は、請求項２の前記ガス流通路の
入口側開口方向は、前記ガス流入口の開口方向と略直角
方向にあることを特徴とする。According to a third aspect of the present invention, the inlet side opening direction of the gas flow passage of the second aspect is substantially perpendicular to the opening direction of the gas flow inlet.
【００１４】前記構成によれば、ガス流入口から流入し
たガスは流入通路に流れ込んだ後、略Ｓ字状のガス流通
路の内部を通って計測流路に流れる。ガス流通路を流れ
るガスは、上流側の屈曲通路では乱れた流速分布となる
が、下流側の屈曲通路で乱れた流速分布が修復され、さ
らに、整流フィルタで整流される。According to the above construction, the gas flowing in from the gas inflow port flows into the inflow passage and then flows into the measurement flow passage through the inside of the substantially S-shaped gas flow passage. The gas flowing through the gas flow passage has a disturbed flow velocity distribution in the upstream bent passage, but the disturbed flow velocity distribution in the downstream bent passage is restored and further rectified by the rectifying filter.
【００１５】[0015]
【発明の実施の形態】以下、この発明の実施の形態を図
面に基づいて説明するが、従来と同一構成部分は同一番
号を付して説明を省略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１に示すように、ガスメータ本体１の流
入通路５の内部には計測流路１２の上流側に設けられた
略Ｌ字状の屈曲通路１３と逆方向に略Ｌ字状に屈曲され
た屈曲通路２１が設けられている。この屈曲通路２１の
入口側２１ａは流入通路５の内側面に向かって開口して
おり、出口側２１ｂはパッキング９を介して屈曲通路１
３と連通している。As shown in FIG. 1, inside the inflow passage 5 of the gas meter main body 1, a substantially L-shaped bent passage 13 provided upstream of the measurement flow passage 12 is bent into a substantially L-shaped bend in the opposite direction. A curved passage 21 is provided. The inlet side 21a of the bent passage 21 is open toward the inner side surface of the inflow passage 5, and the outlet side 21b is connected to the bent passage 1 via the packing 9.
It communicates with 3.
【００１７】従って、屈曲通路１３と２１とによって略
Ｓ字状のガス流通路２２が形成され、ガス流入口３ａか
ら流入したガスは流入通路５に流れ込んだ後、略Ｓ字状
のガス流通路２２の内部を通って計測流路１２に流れ
る。ガス流通路２２を流れるガスは、上流側の屈曲通路
２１では乱れた流速分布となるが、下流側の屈曲通路１
３で乱れた流速分布が修復され、さらに、整流フィルタ
１７で整流される。Therefore, the curved passages 13 and 21 form a substantially S-shaped gas flow passage 22, and the gas flowing from the gas inlet 3a flows into the inflow passage 5, and then the substantially S-shaped gas flow passage. It flows through the inside of 22 to the measurement flow path 12. The gas flowing through the gas flow passage 22 has a disturbed flow velocity distribution in the upstream bent passage 21, but the gas flowing through the gas flow passage 22 has a disturbed flow velocity distribution.
The flow velocity distribution disturbed in 3 is restored and further rectified by the rectifying filter 17.
【００１８】この結果、計測流路１２での流速分布の平
均化が得られるため、超音波センサ１５，１６によって
ガス流量を正確に計測することができ、計測精度を向上
できる。As a result, the flow velocity distribution in the measurement flow path 12 can be averaged, so that the gas flow rate can be accurately measured by the ultrasonic sensors 15 and 16, and the measurement accuracy can be improved.
【００１９】なお、前記実施形態においては、計測流路
１２の上流側に設けられた屈曲通路１３と流入通路５に
設けた屈曲通路２１とを別体に構成しているが、これら
を一体に構成したＳ字状のガス流通路２２としてもよ
く、配管をＳ字状に屈曲したものでもよい。In the above embodiment, the bending passage 13 provided on the upstream side of the measurement flow passage 12 and the bending passage 21 provided in the inflow passage 5 are formed separately, but they are integrated. The configured S-shaped gas flow passage 22 may be used, or the pipe may be bent in an S-shape.
【００２０】[0020]
【発明の効果】以上説明したように、この発明によれ
ば、計測流路の上流側に略Ｓ字状のガス流通路を設ける
ことにより、計測流路での流速分布の平均化が得られる
ため、超音波センサによってガス流量を正確に計測する
ことができ、計測精度を向上できる。As described above, according to the present invention, by providing the substantially S-shaped gas flow passage on the upstream side of the measurement flow passage, the flow velocity distribution in the measurement flow passage can be averaged. Therefore, the gas flow rate can be accurately measured by the ultrasonic sensor, and the measurement accuracy can be improved.
【図１】この発明の第１の実施形態を示し、超音波ガス
メータの縦断正面図。FIG. 1 is a vertical sectional front view of an ultrasonic gas meter according to a first embodiment of the present invention.
【図２】従来の超音波ガスメータの縦断正面図。FIG. 2 is a vertical sectional front view of a conventional ultrasonic gas meter.
３ａ…ガス流入口 ４ａ…ガス流出口 ５…流入通路 １２…計測流路 １５，１６…超音波センサ １７…整流フィルタ ２２…ガス流通路 3a ... Gas inlet 4a ... Gas outlet 5 ... Inflow passage 12 ... Measurement channel 15, 16 ... Ultrasonic sensor 17 ... Rectifier filter 22 ... Gas flow passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石関 淳 東京都板橋区大原町13番１号 株式会社金 門製作所内 Ｆターム(参考） 2F030 CA03 CC13 CF01 CH01 2F035 AA06 DA14 ─────────────────────────────────────────────────── ─── Continued front page (72) Atsushi Atsushi Atsushi 13-1 Oharamachi, Itabashi-ku, Tokyo Kin Co., Ltd. Inside the gate factory F term (reference) 2F030 CA03 CC13 CF01 CH01 2F035 AA06 DA14
Claims (3)
から計測流路に流入し、前記計測流路に設置した超音波
センサによって超音波の伝搬速度の変化を検知してガス
流量を計測する超音波ガスメータにおいて、 前記計測流路の上流側に整流フィルタを設けるととも
に、この整流フィルタのさらに上流側に略Ｓ字状のガス
流通路を設けたことを特徴とする超音波ガスメータ。1. A gas flow rate is measured by flowing a gas flowing in from a gas inlet into a measurement channel through an inflow channel and detecting a change in ultrasonic wave propagation velocity by an ultrasonic sensor installed in the measurement channel. In the ultrasonic gas meter, a rectifying filter is provided on the upstream side of the measurement flow path, and a substantially S-shaped gas flow passage is provided on the upstream side of the rectifying filter.
側に設けられた略Ｌ字状の屈曲通路と、前記流入通路の
内部に設けられ前記屈曲通路と逆方向に略Ｌ字状に屈曲
する屈曲管路とを接続して形成されていることを特徴と
する請求項１記載の超音波ガスメータ。2. The gas flow passage has a substantially L-shaped bent passage provided upstream of the measurement flow passage, and a substantially L-shaped bent passage provided inside the inflow passage in a direction opposite to the bent passage. The ultrasonic gas meter according to claim 1, wherein the ultrasonic gas meter is formed by connecting to a bending pipe line that bends in a vertical direction.
記ガス流入口の開口方向と略直角方向にあることを特徴
とする請求項２記載の超音波ガスメータ。3. The ultrasonic gas meter according to claim 2, wherein the opening direction of the gas flow passage on the inlet side is substantially perpendicular to the opening direction of the gas flow inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002109291A JP2003302275A (en) | 2002-04-11 | 2002-04-11 | Ultrasonic gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002109291A JP2003302275A (en) | 2002-04-11 | 2002-04-11 | Ultrasonic gas meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003302275A true JP2003302275A (en) | 2003-10-24 |
Family
ID=29392796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002109291A Pending JP2003302275A (en) | 2002-04-11 | 2002-04-11 | Ultrasonic gas meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003302275A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009186429A (en) * | 2008-02-08 | 2009-08-20 | Toyo Gas Meter Kk | Gas meter |
-
2002
- 2002-04-11 JP JP2002109291A patent/JP2003302275A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009186429A (en) * | 2008-02-08 | 2009-08-20 | Toyo Gas Meter Kk | Gas meter |
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