JP4068744B2

JP4068744B2 - Gas meter

Info

Publication number: JP4068744B2
Application number: JP35743298A
Authority: JP
Inventors: 恵岩川; 修一岡田; 訓弘藤本; 克久花木; 亨松山; 英司中村; 貴昭吉田
Original assignee: Osaka Gas Co Ltd; Aichi Tokei Denki Co Ltd
Current assignee: Osaka Gas Co Ltd; Aichi Tokei Denki Co Ltd
Priority date: 1998-12-16
Filing date: 1998-12-16
Publication date: 2008-03-26
Anticipated expiration: 2018-12-16
Also published as: JP2000180236A

Description

【０００１】
【発明の属する技術分野】
本発明はガスメータに関するもので、より詳しくはガスメータ内のガス流路を遮断、開放する遮断弁部の構造に関する。
【０００２】
【従来の技術】
従来、図４に示すように、入口金１と出口金２を設けた上ケース３に下ケース４を固着したガスメータにおいて、図５に示すように、前記上ケース３の入口金１における口金穴の直下部に位置して該口金穴と連通する弁挿入穴５を水平方向に形成し、該弁挿入穴５の一端開口側にはシール部材６を介してソレノイド７を備え、弁挿入穴５内には前記ソレノイド７で進退移動するゴム材からなる弁体８を備え、更に前記弁挿入穴５の奥部（底部）には前記弁体８と対向する金属製（真ちゅう製）の環体からなる弁座９を設け、該弁座９の弁座穴１０を通じて前記弁挿入穴５と連通する下流側流路部１１を形成し、常時は弁体８が図５の開状態にあり、ガス流路を遮断する際には、ソレノイド７を閉駆動して弁体８を前進させ、該弁体８を弁座９に圧接させて弁座穴１０を閉じ、弁挿入穴５と下流側流路部１１からなるガス流路を遮断するようにしたものがある。
【０００３】
そして、前記ソレノイド７と弁体８からなる電磁弁は、閉弁時にはソレノイド７の励磁によって弁体８が閉移動するが、開弁時には手動で押ボタン１２を押して開復帰部材１３を弁体８側へ押し移動し、該部材１３により弁体８を開弁する、いわゆる単方向遮断弁で構成されている。
【０００４】
なお、前記弁座９は上ケース３に接着剤で固着され、また前記開復帰部材１３には流通窓１４が形成されている。
【０００５】
【発明が解決しようとする課題】
前記従来構造のように、いわゆる単方向遮断弁を使用したものにおいては、その遮断弁の閉操作を遠隔操作できないため、この遮断弁として、その弁体の開方向と閉方向の双方向の動作を共に１個のソレノイドで行う電動開閉弁（双方向遮断弁とも称される）を使用して遠隔操作を行うことが望ましい。
【０００６】
しかし、前記従来の弁体のストロークが大きい単方向遮断弁に対応して形成された弁座部の構造をそのまま前記のストロークが小さい電動開閉弁に適用するとガスの圧力損失が大きくなり実用に適さない。
【０００７】
そこで本発明は、前記のような電動開閉弁を使用するとともにその弁体と弁座との寸法関係を電動開閉弁に最適な寸法に設定してガスの圧力損失を低減し、実用に適するガスメータを提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
前記の問題を解決するために、請求項１記載の発明は、上ケースと下ケースからなるガスメータにおいて、上ケースの入口金穴の直下部に弁挿入穴を、その穴軸を前記入口金穴の穴軸と直交する方向にして入口金穴と連通して設け、前記弁挿入穴の奥部には、ガス流通路である弁座穴を形成した環状の弁座面を有する弁座アダプタを設け、前記弁挿入穴の弁挿入側には、前記弁座面と対向して接離する弁体を有する電動開閉弁を備え、更に、前記弁体を前記入口金穴の略直下に位置させたことを特徴とするものである。
請求項２記載の発明は、請求項１記載の発明において、前記弁体のストロークを５ｍｍに設定し、前記弁体の外径と前記弁座穴の内径の差を４ｍｍに設定し、前記弁挿入穴の内径と弁体の外径の差を８ｍｍに設定したことを特徴とするものである。
【０００９】
請求項２記載の発明においては、弁体のストロークが従来の単方向遮断弁よりも短い電動開閉弁を使用しても、弁体径と弁座穴径と弁挿入穴径の寸法関係前記のように設定したことにより、開弁時におけるガス遮断流路部の流通面積が大きく確保される。そのため、ガスの流れが良くなり、ガスの圧力損失が低減される。
請求項３記載の発明は、請求項１又は２記載の発明において、前記弁挿入穴の奥部に金属製の環体からなる弁座を設け、該弁座に前記弁座アダプタを嵌着して設けたことを特徴とするものである。
請求項４記載の発明は、請求項３記載の発明において、前記弁座と前記弁座アダプタとの間にシール用のパッキンを配設したことを特徴とするものである。
請求項５記載の発明は、請求項１乃至４のいずれか１項に記載の発明において、前記弁座アダプタを樹脂材料で一体成形したことを特徴とするものである。
請求項６記載の発明は、請求項５記載の発明において、前記弁座アダプタは、前記弁座の内面側に嵌合する筒状の嵌合部と、前記弁座の前面側に位置する環状の弁座部からなり、前記嵌合部の先部を先細状のテーパに形成し、この嵌合部の先部を前記弁座の内面にスナップフィットで嵌着し、スナップフィットを構成する爪部が前記弁座に係止するようにしたことを特徴とするものである。
【００１０】
【発明の実施の形態】
図１乃至図３に示す実施例に基いて本発明の実施の形態について説明する。
本実施例は、前記図５に示す構造において、電磁弁と弁座部が異なり、かつ開復帰部材１３を排した構造で、その他の部分は図５に示す構造と略同様である。
【００１１】
図１はガスの遮断通路部の平断面図で、その上ケース３の下部には前記従来構造と同様に下ケースがある。
上ケース３内に形成された弁挿入穴５は、前記図４及び図５で説明したように、上ケース３の入口金１における口金穴１ａの直下部に位置して該口金穴１ａと連通し、かつ、水平に配置されている。該弁挿入穴５は弁挿入穴形成壁３ａで形成され、その後端に電動開閉弁の取付部３ｂが形成されている。また、弁挿入穴５の周面、すなわち弁挿入穴形成壁３ａの内面３ｃは、弁座９側が小径で取付部３ｂ側が大径となるテーパ面に形成されている。
【００１２】
そして、弁挿入穴５の後端開口側にシール部材６を介してソレノイド２０が設置され、弁挿入穴５内には前記ソレノイド２０により水平に進退移動する弁体２１が配置されている。これらは、そのソレノイド２０の励磁によって弁体２１を開方向と閉方向の双方の動作を行う電動開閉弁２２を構成している。なお、この電動開閉弁２２は通常双方向遮断弁ともいわれている。
【００１３】
前記弁挿入穴５の奥部（底部）には、前記図５の従来構造と同様の真ちゅう等の金属製の環体からなる弁座９が、前記弁体２１と略同芯的に配置され、これが接着剤等により上ケース３に固着されている。
【００１４】
前記弁座９には弁座アダプタ２３が嵌着して備えられている。該弁座アダプタ２３は、前記弁座９の内側面に嵌合する筒状の嵌合部２３ａと、前記弁座９の前面側に位置する環状の弁座部２３ｂとを樹脂材料で一体成形して形成され、弁座部２３ｂにおける前記弁体２１と対向する側に弁座面２３ｃが形成されている。前記嵌合部２３ａと弁座部２３ｂは前記弁体２１と略同芯的に配置され、弁座部２３ｂの内側には弁体２１と略同芯円となる弁座穴２３ｄが形成されている。また、前記弁座アダプタ２３は、そのテーパ付嵌合部２３ａを弁座９の内面にスナップフィットで嵌着してその爪部２３ｅが弁座９に係止されており、前記従来の弁座９に簡単に取り付けられるようになっている。また、この弁座アダプタ２３を樹脂材料で成形することにより、これに弁体２１が粘着しないようになっている。
【００１５】
前記弁座９と前記弁座アダプタ２３間にはシール用のパッキン２４が介在され、弁座９と弁座アダプタ２３との間からのガス流出を阻止している。
【００１６】
なお、図１において、１１は前記図５と同様の下流側流路部で、前記弁挿入穴５からのガスを前記弁座穴２３ｄを通じて流入させ、該下流側流路部１１から図示しないガス計量室へ流入するようになっている。また、図中１２は前記図５の押ボタンで、図１においては前記図５に示す開復帰部材１３を必要としないので、この押ボタン１２は不要であるが、そのまま残存させてめくら栓としている。
【００１７】
次に前記弁挿入穴５と、弁体２１と、弁座面２３ｃと、弁座穴２３ｄとの寸法関係について図２により説明する。
先ず、図１及び図２に示す開弁状態での弁体２１と弁座面２３ｃとの間隔Ｄ₁、すなわち弁体２１のストロークは５ｍｍに設定されている。
【００１８】
弁体２１の外径Ｄ₂と弁座穴２３ｄの内径Ｄ₃との差は４ｍｍに設定され、弁体２１の外径Ｄ₂と開弁状態における弁体２１の位置での弁挿入穴５の内径Ｄ₄との差は８ｍｍに設定されている。
【００１９】
例えば弁体２１の外径Ｄ₂が２４ｍｍの場合には弁挿入穴５の内径Ｄ₄が３２ｍｍに、また、弁体２１の外径Ｄ₂が２８ｍｍの場合には弁挿入穴５の内径Ｄ₄が３６ｍｍに、また、弁体２１の外径Ｄ₂が３６ｍｍの場合には弁挿入穴５の内径Ｄ₄が４４ｍｍに設定される。また、弁体２１の外径Ｄ₂が前記のように、２４ｍｍ、２８ｍｍ、３６ｍｍに設定される場合には、夫々その弁体２１との間に前記のように４ｍｍの差が生じるように弁座穴２３ｄの内径Ｄ₃が設定される。
【００２０】
また、弁体２１の厚さＤ₅は所望に設定するが、５ｍｍ或いは３．５ｍｍに設定する。図の例では３．５ｍｍに設定されている。
また、弁体２１の外径Ｄ₂が３６ｍｍに設定された場合は、前記弁座アダプタ２３の各部の寸法は図３に示すように、例えばＤ₃＝３２ｍｍ、Ｄ₆＝３９ｍｍ、Ｄ₇＝３５．７ｍｍ、Ｄ₈＝３３．６ｍｍ、Ｄ₉＝９．３ｍｍ、Ｄ₁₀＝２．５ｍｍに設定する。
【００２１】
また、前記弁体２１と入口金穴１ａとの位置関係は、図２に示すように、弁体２１が入口金２における口金穴１ａ略直下に設定されている。より詳しくは、実施例では弁面２１ａの位置が口金穴１ａの中心１ｂから弁座面側方向へわずかな距離Ｄ₁₁である４．５ｍｍ離れて設定されている。
【００２２】
以上の構成であるから、図１及び図２に示す開弁状態時においては、ガスは矢印Ａで示すように、弁挿入穴５から弁体２１の外周面と弁挿入穴５の内周面との隙間Ｂ、弁体２１の弁面２１ａと弁座面２３ｃとの隙間Ｃ、弁座穴２３ｄを流通して下流側流路部１１へと流れる。
【００２３】
また、前記の開弁状態からソレノイド２０を励磁して閉弁駆動すると、弁体２１が前進して弁座面２３ｃに圧接し、前記のガスの流れは遮断される。
次に、前記開弁状態時におけるガスの圧力損失について説明する。
【００２４】
前記図５に示す従来構造においては、単方向遮断弁であるためその弁体８のストロークはかなり長く設定され、開弁時の弁体８と弁座９間の距離Ｄ₁₄はかなり広く、例えばｍｍの隙間となる。そのため、弁体８の外周面と弁挿入穴５の内面との隙間Ｄ₁₅は狭く、例えばｍｍに設定されていてもガスの圧力損失を抑えることができる。
【００２５】
しかし、本発明の前記実施例のように弁体２１のストロークが５ｍｍと短く設定された電動開閉弁２２においては、その弁体２１の外周面と弁挿入穴５の内面との隙間Ｂを前記従来構造のように狭くするとガスの圧力損失が大きくなる。
【００２６】
そこで、この電動開閉弁２２を使用する場合には弁体２１の外径Ｄ₂と弁挿入穴５の穴径Ｄ₄との差を８ｍｍとして、隙間Ｂの距離Ｄ₁₂を従来より広い４ｍｍとし、ガスの圧力損失を抑制した。
【００２７】
また、このように弁体２１の外径Ｄ₂が前記従来の弁体８の外径より小径になったことにより、前記従来の弁座穴径では弁体２１と弁座面との接触面積が少なくシール性に欠けるため、本発明の実施例では前記の弁座アダプタ２３を付設するとともにその弁座穴２３ｄの内径Ｄ₃を前記のように設定して、弁体２１の外周面と弁座穴２３ｄの内面との距離Ｄ₁₃を長く、図の例では２ｍｍに設定して必要な接触面積を確保した。
【００２８】
次に、前記本発明の実施例についての圧力損失試験の結果を示す。

前記の条件で弁体２１を、その外径Ｄ₂が３２ｍｍ、３４ｍｍ、３６ｍｍ、３８ｍｍのものに変えて圧力損失（ｍｍＨ₂Ｏ）を測定した。なお、弁座穴２３ｄの内径Ｄ₃は、弁体２１の外径に対して、いずれの場合にも４ｍｍの差が生じるように設定した。
【００２９】

の値が得られ、外径が３６ｍｍとしたときが最も圧力損失が小さかった。
【００３０】
このことから、弁体２１の外径Ｄ₂と弁挿入穴径Ｄ₄の差が８ｍｍが最も圧力損失が小さいことが分かる。
また、弁体２１の弁面２１ａと、入口金１における口金穴１ａの中心１ｂとの距離Ｄ₁₁を０ｍｍ、２．５ｍｍ、４．５ｍｍ、６ｍｍに変えて圧力損失を測定した結果、下記の圧力損失の値が得られた。
【００３１】
距離Ｄ₁₁が±０のとき２５．０
距離Ｄ₁₁が２．５ｍｍのとき２４．０
距離Ｄ₁₁が４．５ｍｍのとき２３．０
距離Ｄ₁₁が６ｍｍのとき２５．０
以上の結果からＤ₁₁が４．５ｍｍのときが最も圧力損失が小さかった。したがって、Ｄ₁₁を４．５ｍｍに設定することが最適である。
【００３２】
【発明の効果】
以上のようであるから本発明によれば、電動開閉弁を使用でき、かつ、この電動開閉弁の開弁時においてもガスの圧力損失が小さいガスメータを提供できる。
【図面の簡単な説明】
【図１】本発明の実施例を示す要部の平断面図。
【図２】図１における弁部の拡大平断面図。
【図３】図１における弁座アダプタの拡大平断面図。
【図４】本発明を適用するガスメータの前面図。
【図５】従来構造を示す平断面図。
【符号の説明】
１…入口金１ａ…入口金穴
３…上ケース４…下ケース
５…弁挿入穴２０…ソレノイド
２１…弁体２２…電動開閉弁
２３ｃ…弁座面２３ｄ…弁座穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas meter, and more particularly to a structure of a shut-off valve portion that shuts off and opens a gas flow path in the gas meter.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4, in a gas meter in which a lower case 4 is fixed to an upper case 3 provided with an inlet metal 1 and an outlet metal 2, a cap hole in the inlet metal 1 of the upper case 3 as shown in FIG. A valve insertion hole 5 is formed in the horizontal direction, which is located immediately below the base hole. A solenoid 7 is provided on one end opening side of the valve insertion hole 5 via a seal member 6. Inside, a valve body 8 made of a rubber material that moves forward and backward by the solenoid 7 is provided, and a metal (brass) ring body that faces the valve body 8 is provided at the back (bottom) of the valve insertion hole 5. A downstream flow passage portion 11 communicating with the valve insertion hole 5 through the valve seat hole 10 of the valve seat 9, and the valve body 8 is normally in the open state of FIG. When shutting off the gas flow path, the solenoid 7 is driven to close to advance the valve body 8, and the valve body 8 is moved to the valve seat 9. Close the valve seat hole 10 by pressure contact, is that so as to shut off the gas flow path including the valve insertion hole 5 and the downstream flow path portion 11.
[0003]
The solenoid valve composed of the solenoid 7 and the valve body 8 is closed when the valve 7 is closed by the excitation of the solenoid 7, but when the valve is opened, the push button 12 is manually pressed to open the opening return member 13 to the valve body 8. It is constituted by a so-called unidirectional shut-off valve that moves to the side and opens the valve body 8 by the member 13.
[0004]
The valve seat 9 is fixed to the upper case 3 with an adhesive, and a flow window 14 is formed in the opening return member 13.
[0005]
[Problems to be solved by the invention]
In the case of using a so-called unidirectional shut-off valve as in the conventional structure, since the shut-off operation of the shut-off valve cannot be remotely operated, the valve body is operated in both the opening and closing directions as the shut-off valve. It is desirable to perform remote operation using an electric on-off valve (also referred to as a bidirectional shut-off valve) that performs both operations with a single solenoid.
[0006]
However, if the structure of the valve seat portion corresponding to the unidirectional shut-off valve having a large stroke of the conventional valve body is applied as it is to an electric on-off valve having a small stroke as it is, the pressure loss of the gas becomes large and is suitable for practical use. Absent.
[0007]
Therefore, the present invention uses an electric on-off valve as described above, and sets the dimensional relationship between the valve body and the valve seat to an optimum dimension for the electric on-off valve to reduce gas pressure loss, and is suitable for practical use. Is intended to provide.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a gas meter comprising an upper case and a lower case, wherein a valve insertion hole is provided immediately below the inlet gold hole of the upper case, and the hole shaft is used as the inlet gold hole. A valve seat adapter having an annular valve seat surface formed with a valve seat hole serving as a gas flow passage at the back of the valve insertion hole. provided, the valve insertion side of the valve insertion hole is provided with an electric on-off valve having toward and away from the valve body to face the valve seat surface, further, to position the said valve body substantially immediately below said inlet gold hole it is characterized in that the.
According to a second aspect of the present invention, in the first aspect of the invention, the stroke of the valve body is set to 5 mm, the difference between the outer diameter of the valve body and the inner diameter of the valve seat hole is set to 4 mm, and the valve The difference between the inner diameter of the insertion hole and the outer diameter of the valve body is set to 8 mm.
[0009]
In the invention according to claim 2, even if an electric on-off valve having a stroke of the valve body shorter than that of a conventional unidirectional shut-off valve is used, the dimensional relationship of the valve body diameter, the valve seat hole diameter, and the valve insertion hole diameter By setting as described above, a large flow area of the gas cutoff channel portion at the time of valve opening is ensured. Therefore, the gas flow is improved and the pressure loss of the gas is reduced.
According to a third aspect of the present invention, in the first or second aspect of the present invention, a valve seat made of a metal ring is provided at the back of the valve insertion hole, and the valve seat adapter is fitted to the valve seat. It is characterized by being provided.
According to a fourth aspect of the present invention, in the third aspect of the present invention, a seal packing is provided between the valve seat and the valve seat adapter.
The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the valve seat adapter is integrally formed of a resin material.
According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the valve seat adapter includes a cylindrical fitting portion that is fitted to the inner surface side of the valve seat, and an annular shape that is located on the front side of the valve seat. A nail that forms a snap fit by forming the tip of the fitting portion into a tapered taper and snap fitting the tip of the fitting portion on the inner surface of the valve seat The portion is locked to the valve seat.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described based on the example shown in FIGS.
The present embodiment is different from the structure shown in FIG. 5 in that the solenoid valve and the valve seat are different and the opening / returning member 13 is omitted, and the other parts are substantially the same as the structure shown in FIG.
[0011]
FIG. 1 is a cross-sectional plan view of a gas blocking passage, and a lower case is provided below the upper case 3 as in the conventional structure.
As described with reference to FIGS. 4 and 5, the valve insertion hole 5 formed in the upper case 3 is located immediately below the base hole 1a in the inlet base 1 of the upper case 3 and communicates with the base hole 1a. And are arranged horizontally. The valve insertion hole 5 is formed by a valve insertion hole forming wall 3a, and an electric opening / closing valve mounting portion 3b is formed at the rear end thereof. Further, the peripheral surface of the valve insertion hole 5, that is, the inner surface 3c of the valve insertion hole forming wall 3a is formed as a tapered surface having a small diameter on the valve seat 9 side and a large diameter on the mounting portion 3b side.
[0012]
A solenoid 20 is installed on the opening side of the rear end of the valve insertion hole 5 via a seal member 6, and a valve element 21 that moves forward and backward by the solenoid 20 is disposed in the valve insertion hole 5. These constitute an electric on-off valve 22 that operates the valve body 21 in both the opening direction and the closing direction by the excitation of the solenoid 20. The electric on-off valve 22 is usually called a bidirectional shut-off valve.
[0013]
A valve seat 9 made of a metal ring such as a brass similar to the conventional structure of FIG. 5 is arranged substantially concentrically with the valve body 21 at the back (bottom) of the valve insertion hole 5. This is fixed to the upper case 3 with an adhesive or the like.
[0014]
A valve seat adapter 23 is fitted on the valve seat 9. The valve seat adapter 23 is integrally formed of a resin material with a cylindrical fitting portion 23a fitted on the inner surface of the valve seat 9 and an annular valve seat portion 23b located on the front side of the valve seat 9. The valve seat surface 23c is formed in the valve seat part 23b in the side facing the said valve body 21 in the valve seat part 23b. The fitting portion 23a and the valve seat portion 23b are disposed substantially concentrically with the valve body 21, and a valve seat hole 23d that is substantially concentric with the valve body 21 is formed inside the valve seat portion 23b. Yes. Further, the valve seat adapter 23 has a tapered fitting portion 23a fitted on the inner surface of the valve seat 9 by a snap fit, and a claw portion 23e of the valve seat adapter 23 is locked to the valve seat 9. 9 can be easily attached. Further, by molding the valve seat adapter 23 with a resin material, the valve body 21 does not adhere to the adapter.
[0015]
A seal packing 24 is interposed between the valve seat 9 and the valve seat adapter 23 to prevent gas from flowing out between the valve seat 9 and the valve seat adapter 23.
[0016]
In FIG. 1, reference numeral 11 denotes a downstream channel portion similar to that in FIG. 5. Gas from the valve insertion hole 5 flows through the valve seat hole 23 d, and gas (not shown) from the downstream channel portion 11. It flows into the measuring chamber. Further, in the figure, reference numeral 12 denotes the push button shown in FIG. 5. In FIG. 1, the opening return member 13 shown in FIG. 5 is not required, so the push button 12 is unnecessary, but it is left as it is as a blind plug. Yes.
[0017]
Next, the dimensional relationship among the valve insertion hole 5, the valve body 21, the valve seat surface 23c, and the valve seat hole 23d will be described with reference to FIG.
First, the distance D ₁ between the valve body 21 and the valve seat surface 23c in the valve open state shown in FIGS. 1 and 2, that is, the stroke of the valve body 21 is set to 5 mm.
[0018]
The difference between the inner diameter D ₃ of outer diameter D ₂ and the valve seat hole 23d of the valve element 21 is set to 4 mm, the valve insertion hole 5 at the position of the valve body 21 at the outer diameter D ₂ and the open state of the valve body 21 The difference from the inner diameter D ₄ is set to 8 mm.
[0019]
For example, when the outer diameter D _{2 of the} valve body 21 is 24 mm, the inner diameter D ₄ of the valve insertion hole 5 is 32 mm, and when the outer diameter D ₂ of the valve body 21 is 28 mm, the inner diameter D of the valve insertion hole 5 is. _{When 4} is 36 mm and the outer diameter D ₂ of the valve body 21 is 36 mm, the inner diameter D ₄ of the valve insertion hole 5 is set to 44 mm. Further, when the outer diameter D ₂ of the valve body 21 is set to 24 mm, 28 mm, and 36 mm as described above, the valve body 21 has a difference of 4 mm as described above. the inner diameter D ₃ of Zaana 23d is set.
[0020]
The thickness D ₅ of the valve body 21 is set to a desired, set to 5mm or 3.5 mm. In the example of the figure, it is set to 3.5 mm.
Further, if the outer diameter D ₂ of the valve body 21 is set to 36 mm, the dimension of each part of the valve seat adapter 23, as shown in FIG. 3, for example, _{_{D 3 = 32mm, D 6 =}} 39mm, D 7 = Set to 35.7 mm, D ₈ = 33.6 mm, D ₉ = 9.3 mm, and D ₁₀ = 2.5 mm.
[0021]
Further, the positional relationship between the valve body 21 and the inlet metal hole 1a is set so that the valve body 21 is substantially immediately below the base hole 1a in the inlet metal 2 as shown in FIG. More specifically, the position of the valve face 21a in the embodiment is set apart 4.5mm is very small distance D ₁₁ from the center 1b of the base hole 1a the valve seat surface direction.
[0022]
1 and FIG. 2, the gas flows from the valve insertion hole 5 to the outer peripheral surface of the valve element 21 and the inner peripheral surface of the valve insertion hole 5 in the valve open state shown in FIGS. 1 and 2. And the gap C between the valve surface 21a and the valve seat surface 23c of the valve body 21 and the valve seat hole 23d, and flows to the downstream flow path portion 11.
[0023]
Further, when the solenoid 20 is energized and driven to close from the valve open state, the valve body 21 moves forward and comes into pressure contact with the valve seat surface 23c, thereby blocking the gas flow.
Next, the gas pressure loss in the valve open state will be described.
[0024]
In the conventional structure shown in FIG. 5, since it is a unidirectional shut-off valve, the stroke of the valve body 8 is set to be quite long, and the distance D ₁₄ between the valve body 8 and the valve seat 9 when the valve is opened is quite wide. It becomes a gap of mm. For this reason, the gap D ₁₅ between the outer peripheral surface of the valve body 8 and the inner surface of the valve insertion hole 5 is narrow, and even if it is set to, for example, mm, the pressure loss of gas can be suppressed.
[0025]
However, in the electric on-off valve 22 in which the stroke of the valve body 21 is set to be as short as 5 mm as in the above-described embodiment of the present invention, the gap B between the outer peripheral surface of the valve body 21 and the inner surface of the valve insertion hole 5 is defined as above. If it is narrow as in the conventional structure, the pressure loss of the gas increases.
[0026]
Therefore, when this electric on-off valve 22 is used, the difference between the outer diameter D ₂ of the valve body 21 and the hole diameter D ₄ of the valve insertion hole 5 is set to 8 mm, and the distance D _{12 of the} gap B is set to 4 mm wider than the conventional one. , Suppressed gas pressure loss.
[0027]
Further, since the outer diameter D ₂ of the valve body 21 is smaller than the outer diameter of the conventional valve body 8 in this way, the contact area between the valve body 21 and the valve seat surface with the conventional valve seat hole diameter. due to lack of less sealability, in the embodiment of the present invention by setting the inside diameter D ₃ of the valve seat hole 23d as well as attaching a said valve seat adapter 23 as described above, the outer peripheral surface and the valve of the valve body 21 increasing the distance D ₁₃ between the inner surface of Zaana 23d, to ensure a contact area required to set the 2mm in the example of FIG.
[0028]
Next, the result of the pressure loss test about the Example of the present invention will be shown.

Under the above conditions, the pressure loss (mmH ₂ O) was measured by changing the valve body 21 to one having an outer diameter D ₂ of 32 mm, 34 mm, 36 mm, or 38 mm. Incidentally, the inner diameter D ₃ of Benzaana 23d is the outer diameter of the valve body 21 was set so that the difference 4mm in any case occur.
[0029]

When the outer diameter was 36 mm, the pressure loss was the smallest.
[0030]
From this, it can be seen that the pressure loss is the smallest when the difference between the outer diameter D ₂ of the valve body 21 and the valve insertion hole diameter D ₄ is 8 mm.
Further, a valve surface 21a of the valve body 21, 0 mm distance D ₁₁ between the center 1b of the base hole 1a at the inlet gold 1, 2.5 mm, 4.5 mm, the result of measuring the pressure loss by changing the 6 mm, the following A pressure loss value was obtained.
[0031]
25.0 when distance D ₁₁ is ± 0
24.0 When the distance D ₁₁ is 2.5mm
23.0 When the distance D ₁₁ is 4.5mm
When the distance D ₁₁ is 6 mm, 25.0
From the above results, the pressure loss was the smallest when D ₁₁ was 4.5 mm. Therefore, it is best to set the D ₁₁ to 4.5 mm.
[0032]
【The invention's effect】
As described above, according to the present invention, an electric on-off valve can be used, and a gas meter with a small gas pressure loss even when the electric on-off valve is opened can be provided.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of an essential part showing an embodiment of the present invention.
FIG. 2 is an enlarged plan sectional view of the valve portion in FIG.
3 is an enlarged plan sectional view of the valve seat adapter in FIG. 1. FIG.
FIG. 4 is a front view of a gas meter to which the present invention is applied.
FIG. 5 is a plan sectional view showing a conventional structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inlet gold 1a ... Inlet gold hole 3 ... Upper case 4 ... Lower case 5 ... Valve insertion hole 20 ... Solenoid 21 ... Valve body 22 ... Electric on-off valve 23c ... Valve seat surface 23d ... Valve seat hole

Claims

In a gas meter consisting of an upper case and a lower case, a valve insertion hole is provided immediately below the inlet gold hole of the upper case, and its hole axis is in a direction perpendicular to the hole axis of the inlet gold hole and communicated with the inlet gold hole. A valve seat adapter having an annular valve seat surface in which a valve seat hole that is a gas flow passage is formed is provided at the back of the valve insertion hole, and the valve seat surface is provided on the valve insertion side of the valve insertion hole. opposed to an electric on-off valve having toward and away from the valve body and, further, a gas meter, characterized in that the valve body was located substantially immediately below said inlet gold hole.

The stroke of the valve body is set to 5 mm, the difference between the outer diameter of the valve body and the inner diameter of the valve seat hole is set to 4 mm, and the difference between the inner diameter of the valve insertion hole and the outer diameter of the valve body is set to 8 mm. The gas meter according to claim 1, wherein

The gas meter according to claim 1 or 2, wherein a valve seat made of a metal ring is provided in a deep part of the valve insertion hole, and the valve seat adapter is fitted to the valve seat.

The gas meter according to claim 3, wherein a seal packing is disposed between the valve seat and the valve seat adapter.

The gas meter according to any one of claims 1 to 4, wherein the valve seat adapter is integrally formed of a resin material.

The valve seat adapter includes a cylindrical fitting portion that fits on the inner surface side of the valve seat and an annular valve seat portion that is positioned on the front side of the valve seat, and the tip portion of the fitting portion tapers. It is formed in a taper shape, and the tip of the fitting portion is snap-fitted to the inner surface of the valve seat so that the claw portion constituting the snap fit is locked to the valve seat. The gas meter according to claim 5.