JPH0518800A - Measuring tube of electromagnetic flowmeter detector - Google Patents
Measuring tube of electromagnetic flowmeter detectorInfo
- Publication number
- JPH0518800A JPH0518800A JP16800191A JP16800191A JPH0518800A JP H0518800 A JPH0518800 A JP H0518800A JP 16800191 A JP16800191 A JP 16800191A JP 16800191 A JP16800191 A JP 16800191A JP H0518800 A JPH0518800 A JP H0518800A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- plate
- electromagnetic flowmeter
- insulating resin
- measuring tube
- 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.)
- Granted
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
(57)【要約】
【構成】測定管内に絶縁性樹脂をモールドする電磁流量
計において、多数の孔を有する管状のプレートを安定さ
せる突起部を、パイプの内面にパイプを形成することに
より設け、プレートとパイプ内面の突起部とが接触する
部分を固定し、そしてプレートを絶縁性樹脂でモールド
した電磁流量計検出器の測定管。
【効果】突起部によりパイプの強度を補強することがで
きるので、それ以外の部分のパイプ肉厚を薄くすること
ができる。このため測定コイル間の距離を短くすること
が可能になり、磁束密度効率を低下させることがない、
更に、うず電流損を低下させる効果がある。
(57) [Summary] [Structure] In an electromagnetic flowmeter in which an insulating resin is molded in a measuring pipe, a protrusion for stabilizing a tubular plate having a large number of holes is provided by forming the pipe on the inner surface of the pipe, A measuring tube for an electromagnetic flowmeter detector in which the part where the plate and the projection on the inner surface of the pipe contact each other is fixed, and the plate is molded with an insulating resin. [Effect] Since the strength of the pipe can be reinforced by the protruding portion, the pipe wall thickness of other portions can be reduced. Therefore, the distance between the measurement coils can be shortened, and the magnetic flux density efficiency is not reduced.
Further, it has an effect of reducing the eddy current loss.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電磁流量計検出器の測
定管に係り、特に磁束密度効率を向上せしめるに好的な
電磁流量計検出器の測定管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring pipe for an electromagnetic flow meter detector, and more particularly to a measuring pipe for an electromagnetic flow meter detector suitable for improving magnetic flux density efficiency.
【０００２】[0002]
【従来の技術】従来の電磁流量計検出器の構造を図３，
図４に示す。パイプ１の内面にリング状の敷板６を、管
軸方向に間隔をおいて、複数個パイプ１へ溶接する。リ
ング状の敷板６の内側へは、多数の孔を有する管状のプ
レート２を挿入し、リング状の敷板６へ溶接する。次に
プレート２を絶縁性樹脂３で射出成形によりモードす
る。絶縁性樹脂３は、プレート２の多数の孔に入って、
パイプ１内壁面まで入り込みプレート２を包むように覆
う。これにより、測定管内は、負圧になったり高温にな
った場合でも、絶縁性樹脂３は、プレート２にて補強さ
れているため、剥離したり変形することがない。2. Description of the Related Art The structure of a conventional electromagnetic flowmeter detector is shown in FIG.
As shown in FIG. A plurality of ring-shaped floor plates 6 are welded to the pipe 1 on the inner surface of the pipe 1 at intervals in the pipe axis direction. A tubular plate 2 having a large number of holes is inserted inside the ring-shaped base plate 6 and welded to the ring-shaped base plate 6. Next, the plate 2 is moded with the insulating resin 3 by injection molding. The insulating resin 3 enters many holes of the plate 2,
The inner wall surface of the pipe 1 is inserted to cover the plate 2 so as to wrap it. As a result, even if the inside of the measuring tube has a negative pressure or a high temperature, the insulating resin 3 is reinforced by the plate 2 and therefore is not peeled or deformed.
【０００３】したがって、絶縁性樹脂３の管内径寸法
は、常に一定に保たれ、流量を高精度に測定することが
できる。Therefore, the inner diameter of the tube of the insulating resin 3 is always kept constant, and the flow rate can be measured with high accuracy.
【０００４】一方、パイプ１の外側は、パイプ１管軸方
向と垂直に位置するパイプ１の中心へ、コイル５，コア
４が上下に取付けられる。コア４の磁極先端４ａは、磁
束密度効率を高くするため、可能なかぎりパイプ１の外
周面に密接させ、上下コア４の磁極間距離Ｌ2を近づけ
る構造となっていた。On the other hand, on the outside of the pipe 1, the coil 5 and the core 4 are vertically attached to the center of the pipe 1 which is positioned perpendicular to the axial direction of the pipe 1. In order to increase the magnetic flux density efficiency, the magnetic pole tip 4a of the core 4 is in close contact with the outer peripheral surface of the pipe 1 as much as possible, and the distance L 2 between the magnetic poles of the upper and lower cores 4 is reduced.
【０００５】[0005]
【発明が解決しようとする課題】従来の電磁流量計検出
器の構造においては、多数の孔を有する管状のプレート
２は、絶縁性樹脂３の安定性を向上させる上で必須であ
り、更にこれを設けるためにリング状の敷板６が必要で
あった。従って前記構造では、管状のプレート２とリン
グ状の敷板６の厚さ分だけ、パイプ１の外径寸法は大き
くなってしまっていた。これは、絶縁性樹脂３の管内径
寸法、及び肉厚、またパイプ１の厚みは、それらの強
度、性能、接続するパイプの口径、測定条件等から必然
的にそれぞれ決められるため、絶縁性樹脂３の内径寸法
を小さくしたり、絶縁性樹脂３及びパイプ１の肉厚を薄
くすることができないためである。In the structure of the conventional electromagnetic flowmeter detector, the tubular plate 2 having a large number of holes is indispensable for improving the stability of the insulating resin 3. The ring-shaped floor plate 6 was required to provide the above. Therefore, in the above structure, the outer diameter of the pipe 1 is increased by the thickness of the tubular plate 2 and the ring-shaped floor plate 6. This is because the inner diameter of the insulating resin 3 and the wall thickness thereof, and the thickness of the pipe 1 are inevitably determined based on their strength, performance, diameter of the pipe to be connected, measurement conditions and the like. This is because it is not possible to reduce the inner diameter dimension of 3 and to reduce the thickness of the insulating resin 3 and the pipe 1.
【０００６】このため、パイプ１外径寸法が大きくなる
に従い、パイプ外周面に密接するコア４の磁極間距離Ｌ
2 は遠くなり、磁束密度が低下してしまっていた。なぜ
なら、磁束密度は、磁極間距離Ｌ2 に反比例するため、
プレート２とリング状の敷板６によるパイプ１外径の増
加は、磁束密度を低下させ、電磁流量計の出力信号のＳ
／Ｎ比を低下させてしまうからである。磁束密度を高く
するためには、コイル５の巻数をふやすか、又は、コイ
ル５に供給する電流を大きくすればよいが、しかし、巻
数をふやすことは、検出器本体のコンパクト化に反し、
電流を大きくすることは、低消費電力化に逆行してしま
う問題があった。For this reason, as the outer diameter of the pipe 1 increases, the distance L between the magnetic poles of the core 4 that closely contacts the outer peripheral surface of the pipe.
2 became far away and the magnetic flux density had decreased. Because the magnetic flux density is inversely proportional to the distance L 2 between the magnetic poles,
An increase in the outer diameter of the pipe 1 due to the plate 2 and the ring-shaped floor plate 6 lowers the magnetic flux density, so that the output signal S
This is because it reduces the / N ratio. In order to increase the magnetic flux density, the number of turns of the coil 5 may be increased or the current supplied to the coil 5 may be increased. However, increasing the number of turns is contrary to the downsizing of the detector main body,
Increasing the current has a problem that it goes against lower power consumption.
【０００７】本発明の目的は、従来の電磁流量計検出器
の測定管に比べ、多数の孔を有する管状のプレート２を
設けても、コア４の磁極間距離Ｌ2 を遠ざけず、磁束密
度効率を低下させない測定管の構造にすることにある。The object of the present invention is to prevent the distance L 2 between the magnetic poles of the core 4 from increasing even if the tubular plate 2 having a large number of holes is provided, as compared with the conventional measuring tube of the electromagnetic flowmeter detector, and the magnetic flux density is increased. It is to make the structure of the measuring tube that does not reduce the efficiency.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、プレートを保持するための突起部分をパイプ内面に
形成し、さらに、この形成部分によりパイプの強度を向
上させ、これにより、突起部以外のパイプ肉厚を薄くし
て、外径寸法を小さくする構造としたものである。In order to achieve the above object, a protruding portion for holding a plate is formed on the inner surface of the pipe, and the formed portion enhances the strength of the pipe. Other than the above, the thickness of the pipe is reduced to reduce the outer diameter.
【０００９】[0009]
【作用】絶縁性樹脂の中へ埋め込まれたプレートは、パ
イプ内面の突起部分により保持され、さらに、この突起
部分によりパイプの強度が増すことにより、その部分以
外のパイプ肉厚を薄くして、パイプ外形寸法を小さくす
ることができる。The plate embedded in the insulating resin is held by the protruding portion on the inner surface of the pipe, and the protruding portion increases the strength of the pipe, thereby reducing the wall thickness of the pipe other than that portion, The external dimensions of the pipe can be reduced.
【００１０】これにより、パイプに取り付けられた上下
コアによる磁極間距離は近くなり、磁束密度効率を高く
することができる。As a result, the distance between the magnetic poles by the upper and lower cores attached to the pipe becomes short, and the magnetic flux density efficiency can be increased.
【００１１】[0011]
【実施例】以下本発明の一実施例を図１，図２により説
明する。パイプ１の内面に、突起部１ａをパイプ１の円
周方向へ帯状に、パイプ１管軸方向へ間隔を置いて複数
箇所設ける。多数の孔を有する管状のプレート２を、パ
イプ１内へ挿入し、突起部１ａと接触する部分を溶接し
て、プレート２を固定する。次にプレート２を絶縁性樹
脂３で射出成形によりモールドする。絶縁性樹脂３は、
プレート２の多数の孔から、パイプ１内壁面まで入り込
みプレート２を包む。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. A plurality of protrusions 1a are provided on the inner surface of the pipe 1 in a band shape in the circumferential direction of the pipe 1 at intervals in the axial direction of the pipe 1. A tubular plate 2 having a large number of holes is inserted into the pipe 1, and a portion in contact with the protrusion 1a is welded to fix the plate 2. Next, the plate 2 is molded with the insulating resin 3 by injection molding. The insulating resin 3 is
The plate 2 is wrapped in from the many holes of the plate 2 to the inner wall surface of the pipe 1.
【００１２】測定管は、管内を流れる流体の圧力から数
十kgｆ/cm2耐える必要があるが、この圧力を保持するの
はパイプ１であり、パイプ１の強度によって保たれる。
パイプ１は、通常ストレートな鉄管を使用するが、突起
部１ａを設けることによって、パイプ１の強度が補強さ
れるので、突起部１ａがない場合と比較し高い圧力に耐
えられる構造となる。したがって、パイプ１の強度を突
起部が補強した分、パイプ１の肉厚ｔ1の寸法を薄くす
ることができる。The measuring pipe must withstand several tens of kgf / cm 2 of the pressure of the fluid flowing in the pipe, but it is the pipe 1 that holds this pressure, and the strength of the pipe 1 holds it.
The pipe 1 normally uses a straight iron pipe, but the strength of the pipe 1 is reinforced by providing the protrusion 1a, so that the pipe 1 has a structure capable of withstanding a higher pressure than in the case without the protrusion 1a. Therefore, as the strength of the pipe 1 is reinforced by the protrusion, the thickness t 1 of the pipe 1 can be reduced.
【００１３】このため、パイプ１の外径寸法は、小さく
なり、パイプ１外側に取付けたコア４の上下間の先端距
離Ｌ1 は狭くなる。Therefore, the outer diameter of the pipe 1 is reduced, and the tip distance L 1 between the top and bottom of the core 4 attached to the outside of the pipe 1 is reduced.
【００１４】また、パイプ肉厚を薄くすることによっ
て、パイプ１に流れるうず電流は少なくなり、渦電流損
も低下する。Further, by reducing the wall thickness of the pipe, the eddy current flowing in the pipe 1 is reduced and the eddy current loss is also reduced.
【００１５】以上、本発明の一実施例によれば、絶縁性
樹脂３の変形を防止するプレート２を設けた場合でも、
磁極間距離を短くすることができ磁束密度効率を低下さ
せることがない。さらにパイプの肉厚が薄くなるのでう
ず電流損を低下させる効果もある。As described above, according to the embodiment of the present invention, even when the plate 2 for preventing the deformation of the insulating resin 3 is provided,
The distance between the magnetic poles can be shortened and the magnetic flux density efficiency is not lowered. Further, since the wall thickness of the pipe becomes thin, it has an effect of reducing the eddy current loss.
【００１６】その他の本発明の実施例を説明すると、図
５は、パイプ１内面の突起部１ａをパイプ１管軸方向へ
帯状に、円周方向へ間隔をおいて複数箇所設けたもの
で、パイプ１管軸方向の締付力が大きい場合、図６は、
突起部１ａを、パイプ１管軸方向と、パイプ１円周方向
の両方へ帯状に複数箇所設けたもので、パイプ１内圧力
とパイプ１管軸方向の締付力の両者が大きい場合、図７
は、突起部１ａを、螺旋して帯状に複数個設けたもの
で、パイプ１内圧力が大きい場合に有効であり、前述し
た本発明の一実施例と同一の効果がある。Another embodiment of the present invention will be described. FIG. 5 shows that the projections 1a on the inner surface of the pipe 1 are provided in a strip shape in the axial direction of the pipe 1 and at a plurality of positions at intervals in the circumferential direction. When the tightening force in the axial direction of the pipe 1 is large, Fig. 6 shows
When the projections 1a are provided at a plurality of strip-shaped locations in both the pipe 1 pipe axial direction and the pipe 1 circumferential direction, and when both the internal pressure of the pipe 1 and the tightening force in the pipe 1 pipe axial direction are large, 7
Is a plurality of protrusions 1a spirally provided in a strip shape, which is effective when the internal pressure of the pipe 1 is large, and has the same effect as that of the above-described embodiment of the present invention.
【００１７】[0017]
【発明の効果】本発明によれば、多数の孔を有する管状
のプレートを絶縁性樹脂の中に埋め込んだ測定管におい
ても、パイプ肉厚を薄くすることができるため、測定コ
イルの磁極間距離は近くなり、磁束密度効率を低下させ
ない効果がある。さらに、パイプに流れるうず電流が少
なくなり、うず電流損を低下させる効果もある。According to the present invention, even in a measuring tube in which a tubular plate having a large number of holes is embedded in an insulating resin, the pipe wall thickness can be reduced, so that the distance between the magnetic poles of the measuring coil can be reduced. Are close to each other, which has the effect of not lowering the magnetic flux density efficiency. In addition, the eddy current flowing through the pipe is reduced, which has the effect of reducing the eddy current loss.
【図１】本発明の一実施例を説明する検出器構造の縦断
面図。FIG. 1 is a vertical sectional view of a detector structure for explaining an embodiment of the present invention.
【図２】図１のＩ−Ｉより切断した断面図。FIG. 2 is a cross-sectional view taken along the line II of FIG.
【図３】図３は従来形の検出器構造の縦断面図。FIG. 3 is a vertical cross-sectional view of a conventional detector structure.
【図４】図３のII−IIより切断した断面図。FIG. 4 is a sectional view taken along line II-II in FIG.
【図５】突起部をパイプの管軸方向に設けた本発明の他
の実施例。FIG. 5 is another embodiment of the present invention in which the protrusion is provided in the pipe axial direction.
【図６】突起部をパイプの管軸方向と、円周方向に設け
た本発明の他の実施例。FIG. 6 is another embodiment of the present invention in which the protrusions are provided in the pipe axial direction and the circumferential direction.
【図７】突起部をパイプの管軸方向に沿って螺旋状に設
けた本発明の他の実施例。FIG. 7 is another embodiment of the present invention in which the protrusion is provided in a spiral shape along the pipe axial direction.
１…パイプ、２…多数の孔を有する管状のプレート、３
…絶縁性樹脂、４…コア、５…コイル、６…リング状の
敷板、１ａ…突起部、４ａ…磁極先端。1 ... Pipe, 2 ... Tubular plate with many holes, 3
... Insulating resin, 4 ... Core, 5 ... Coil, 6 ... Ring-shaped base plate, 1a ... Protrusion, 4a ... Magnetic pole tip.
Claims (5)
トを絶縁性樹脂で射出成形した電磁流量計検出器の測定
管において、前記パイプの内面を前記プレートを保持す
る突起部を持つように成形したことを特徴とする電磁流
量計検出器の測定管。1. A measuring tube of an electromagnetic flowmeter detector, wherein a plate is attached to an inner surface of a pipe, and the plate is injection-molded with an insulating resin, and the inner surface of the pipe is molded so as to have a protrusion for holding the plate. A measuring tube for an electromagnetic flowmeter detector, which is characterized in that
へ帯状に設けて構成された請求項１記載の電磁流量計検
出器の測定管。2. The measuring pipe for an electromagnetic flowmeter detector according to claim 1, wherein the projection on the inner surface of the pipe is formed in a band shape in the circumferential direction of the pipe.
向へ帯状に設けて構成された請求項１記載の電磁流量計
検出器の測定管。3. The measuring pipe for an electromagnetic flowmeter detector according to claim 1, wherein the projection on the inner surface of the pipe is formed in a strip shape in the pipe axial direction.
と、管軸方向の両方向へ帯状に設けて構成された請求項
１記載の電磁流量計検出器の測定管。4. The measuring pipe for an electromagnetic flowmeter detector according to claim 1, wherein the projections on the inner surface of the pipe are formed in a strip shape in both the circumferential direction of the pipe and the pipe axis direction.
旋して帯状に設けて構成された請求項１記載の電磁流量
計検出器の測定管。5. The measuring tube for an electromagnetic flowmeter detector according to claim 1, wherein the projection on the inner surface of the pipe is formed by spirally forming the inner surface of the pipe in a strip shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03168001A JP3139057B2 (en) | 1991-07-09 | 1991-07-09 | Electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03168001A JP3139057B2 (en) | 1991-07-09 | 1991-07-09 | Electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0518800A true JPH0518800A (en) | 1993-01-26 |
| JP3139057B2 JP3139057B2 (en) | 2001-02-26 |
Family
ID=15859966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03168001A Expired - Fee Related JP3139057B2 (en) | 1991-07-09 | 1991-07-09 | Electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3139057B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010122215A (en) * | 2008-11-17 | 2010-06-03 | Krohne Ag | Magnetic-inductive flow meter |
| US7895902B2 (en) * | 2008-01-15 | 2011-03-01 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter including circumferential grooves on an inner surface of a measurement pipe for fixing a liner |
| US8397585B2 (en) | 2009-05-19 | 2013-03-19 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter having liner reinforcing plate with divided ring plates |
| WO2021121866A1 (en) * | 2019-12-16 | 2021-06-24 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow meter |
-
1991
- 1991-07-09 JP JP03168001A patent/JP3139057B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7895902B2 (en) * | 2008-01-15 | 2011-03-01 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter including circumferential grooves on an inner surface of a measurement pipe for fixing a liner |
| JP2010122215A (en) * | 2008-11-17 | 2010-06-03 | Krohne Ag | Magnetic-inductive flow meter |
| US8397585B2 (en) | 2009-05-19 | 2013-03-19 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter having liner reinforcing plate with divided ring plates |
| DE102010020768B4 (en) * | 2009-05-19 | 2013-07-04 | Kabushiki Kaisha Toshiba | Electromagnetic flowmeter |
| US8707800B2 (en) | 2009-05-19 | 2014-04-29 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter having liner reinforcing plate with spiral ring |
| US9175992B2 (en) | 2009-05-19 | 2015-11-03 | Kabushiki Kaisha Toshiba | Electromagnetic flow meter having liner reinforcing plate and a cylindrical plate having cutout portions at the ends |
| WO2021121866A1 (en) * | 2019-12-16 | 2021-06-24 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow meter |
| CN115151792A (en) * | 2019-12-16 | 2022-10-04 | 恩德斯+豪斯流量技术股份有限公司 | Magnetic induction flowmeter |
| US20230009049A1 (en) * | 2019-12-16 | 2023-01-12 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow meter |
| US12209893B2 (en) | 2019-12-16 | 2025-01-28 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3139057B2 (en) | 2001-02-26 |
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