JPH0477253B2 - - Google Patents
Info
- Publication number
- JPH0477253B2 JPH0477253B2 JP28101787A JP28101787A JPH0477253B2 JP H0477253 B2 JPH0477253 B2 JP H0477253B2 JP 28101787 A JP28101787 A JP 28101787A JP 28101787 A JP28101787 A JP 28101787A JP H0477253 B2 JPH0477253 B2 JP H0477253B2
- Authority
- JP
- Japan
- Prior art keywords
- measuring tube
- fluid
- case
- coil
- metallized
- 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.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 description 19
- 230000005284 excitation Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は測定管内を流れる被測定流体の流量を
電気的に測定する電磁流量計に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic flowmeter that electrically measures the flow rate of a fluid to be measured flowing within a measuring pipe.
電磁流量計は、測定管内を流れる被測定流体を
導体としてとらえ、この流動導体に磁界を与える
ことにより電圧を発生させ、この電圧を電極で検
出して流量測定を行うものであつて、従来例えば
特開昭56−124823号公報に開示されているものは
次のように構成されている。すなわち、被測定流
体が内部を流れるセラミツク製測定管の外周凹陥
部内には、励磁コイル等からなる磁束発生装置
が、磁束発生方向を電極の軸線方向ならびに流体
の流れ方向と直交させて収納されており、また、
測定管の両側開口端面にガスケツトを介して固着
されたアースリングは、内孔を流体に接液させて
いるとともに、アースリングと流量計ケースとの
間は、埋込み端子を介してリード線で電気的に導
通されている。このように構成されていることに
より、励磁コイルを励磁し、測定管内を導電性流
体が流れると、磁界方向と流体の流れ方向とにそ
れぞれ直交する電極間には、平均流量に比例した
起電力が発生するので、これを電気信号に変換し
て測定することによつて流量が得られる。また、
流体とケースとがアースリングとリード線および
埋込み端子を介して短絡されていることにより、
被測定流体と計器全体とが同じ基準電位を保持す
るので、電極による起電力の取出しが精度よく行
われる。
An electromagnetic flowmeter treats the fluid to be measured flowing in a measurement pipe as a conductor, generates a voltage by applying a magnetic field to this flowing conductor, and detects this voltage with electrodes to measure the flow rate. The device disclosed in Japanese Unexamined Patent Publication No. 124823/1983 is constructed as follows. That is, a magnetic flux generating device consisting of an excitation coil or the like is housed in the outer circumferential recess of the ceramic measuring tube through which the fluid to be measured flows, with the direction of magnetic flux generation perpendicular to the axial direction of the electrodes and the flow direction of the fluid. Also,
The grounding ring is fixed to both open ends of the measurement tube via gaskets, and the inner hole is in contact with the fluid.The grounding ring and the flowmeter case are connected to each other by a lead wire via an embedded terminal. It is electrically conductive. With this configuration, when the excitation coil is excited and a conductive fluid flows in the measurement tube, an electromotive force proportional to the average flow rate is generated between the electrodes that are perpendicular to the magnetic field direction and the fluid flow direction. is generated, and the flow rate can be obtained by converting this into an electrical signal and measuring it. Also,
Because the fluid and the case are short-circuited through the ground ring, lead wire, and embedded terminal,
Since the fluid to be measured and the entire meter maintain the same reference potential, the electromotive force can be taken out with high precision by the electrodes.
さらに、実開昭61−96320号公報に開示されて
いるものは、セラミツク製測定管の両端面に導電
材を焼付けて流体に接液させ、この導電材とケー
スとをリード線で接続することにより流体と計器
全体とを同電位に保持させるようにしたものであ
る。 Furthermore, what is disclosed in Japanese Utility Model Application Publication No. 61-96320 is to bake a conductive material on both end surfaces of a ceramic measuring tube so that it comes into contact with the fluid, and to connect the conductive material and the case with a lead wire. This keeps the fluid and the entire instrument at the same potential.
しかしながら、このような従来の電磁流量計に
おいては、アースリングや導電材とケースとがリ
ード線のはんだ付けなどによつて接続されている
ので、配管の振動によりリード線とケースや埋込
み端子との接続部がゆるんだり断線したりあるい
ははんだ付け部が破損したりすることがあつて信
頼性に欠けるという問題があつた。
However, in such conventional electromagnetic flowmeters, the grounding ring or conductive material and the case are connected by soldering the lead wires, so vibrations in the piping can cause the lead wires to connect with the case or embedded terminals. There was a problem that the connection part became loose or disconnected, or the soldered part was damaged, resulting in a lack of reliability.
このような問題点を解決するために本発明にお
いては、一部を接液させてセラミツク製測定管の
両開口端面に形成した両方のメタライズ部を、測
定管の外周部稜線方向に形成した帯状のメタライ
ズ部で接続し、この帯状メタライズ部に接して配
設したコイルユニツトを介しコイルボビンを流量
計ケースにねじ止めした。
In order to solve these problems, in the present invention, both metallized parts, which are partially in contact with liquid and formed on both opening end faces of a ceramic measuring tube, are replaced by a band-shaped part formed in the direction of the outer circumferential ridgeline of the measuring tube. The coil bobbin was screwed to the flowmeter case via a coil unit disposed in contact with this band-shaped metallized portion.
被測定流体と流量計全体とは、測定管両端のメ
タライズ部とこれを接続する帯状のメタライズ部
およびコイルボビンで短絡されるので、互いに同
電位を保持する。
The fluid to be measured and the entire flow meter are short-circuited by the metallized parts at both ends of the measuring tube, the band-shaped metallized part connecting these parts, and the coil bobbin, so that they maintain the same potential.
第１図ないし第４図は本発明に係る電磁流量計
の実施例を示し、第１図はその縦断面図、第２図
は同じく側断面図、第３図は測定管の平面図、第
４図は同じく側面図である。図において、管路と
接合される両側開口端面１ａ，１ｂを有する測定
管１は、Al2O3等のセラミツクにより円筒状に形
成されており、その外周面を円周方向に４等分す
る箇所には、互いに対向する一対の方形状電極装
着面１ｃと、互いに対向する一対のコイル装着用
凹陥部１ｄとが、互いに直交して形成されてい
る。両側の電極装着面１ｃに設けられた電極孔に
は、一対の電極２が挿入固定されており、その挿
入端は、測定管１の内孔を流れる導電性流体に接
液されている。測定管１は、プロセス固定部側に
支持された金属製の計器ケース３の中心孔３ａに
外周両端部を嵌着固定されており、その嵌合面に
は、シール部材としてのＯリング４がＯリング溝
１ｆ内に位置して介挿されている。ケース３は前
記凹陥面１ｄに対応する一対の角筒部３ｂとこれ
に続く鍔付きの円筒部３ｃ，３ｄとを有してお
り、角筒部３ｂの内孔には、両鍔付き管状に形成
されたボビン本体５ａとこれにねじ止めされた円
板５ｂとからなるコイルボビン５と、これに巻回
された励磁コイル６とで形成されたコイルユニツ
ト７が収納されている。そしてコイルユニツト７
は、コイルボビン５の円板５ｂをケース３の段部
にねじ止めすることによりケース３に固定されて
いるとともに、上下のコイルユニツト７で測定管
１を挟持してケース３と測定管１とを固定してい
る。前記電極２に接続されたリード線８はコイル
ボビン５の内孔を経て図示しない端子箱または変
換器に導かれており、また励磁コイル６に接続さ
れたリード線９は、円板５ｂの孔を経て電源に導
かれている。
1 to 4 show an embodiment of the electromagnetic flowmeter according to the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a side sectional view, and FIG. 3 is a plan view of a measuring tube. Figure 4 is also a side view. In the figure, a measuring tube 1 having open end surfaces 1a and 1b on both sides to be connected to the pipe line is formed into a cylindrical shape from ceramic such as Al 2 O 3 , and its outer circumferential surface is divided into four equal parts in the circumferential direction. A pair of rectangular electrode mounting surfaces 1c facing each other and a pair of coil mounting recesses 1d facing each other are formed at the location orthogonally to each other. A pair of electrodes 2 are inserted and fixed into electrode holes provided in the electrode mounting surfaces 1c on both sides, and the insertion ends thereof are in contact with the conductive fluid flowing through the inner hole of the measurement tube 1. The measuring tube 1 has both outer peripheral ends fitted and fixed into the center hole 3a of a metal instrument case 3 supported on the process fixing part side, and an O-ring 4 as a sealing member is attached to the fitting surface. It is positioned and inserted within the O-ring groove 1f. The case 3 has a pair of square cylindrical portions 3b corresponding to the concave surface 1d, and cylindrical portions 3c and 3d with flanges following the pair. A coil unit 7 is housed in the coil bobbin 5, which is made up of a formed bobbin body 5a and a disk 5b screwed to the bobbin body, and an excitation coil 6 wound around the coil bobbin 5. and coil unit 7
is fixed to the case 3 by screwing the disk 5b of the coil bobbin 5 to the stepped part of the case 3, and also connects the case 3 and the measurement tube 1 by sandwiching the measurement tube 1 between the upper and lower coil units 7. Fixed. The lead wire 8 connected to the electrode 2 is led to a terminal box or converter (not shown) through the inner hole of the coil bobbin 5, and the lead wire 9 connected to the excitation coil 6 is led through the hole of the disc 5b. through which it is led to the power source.
測定管１の両側開口端面１ａ，１ｂには、セラ
ミツク面に金属のメタライズ加工が施されて第４
図に示すように環状部と半径部とからなるメタラ
イズ部１０が形成されており、これら両側のメタ
ライズ部１０は、測定管１の外周部稜線方向に形
成された同様の帯状メタライズ部１１で接続され
ている。メタライズ部１０，１１の材質は、Mo
−MnまたはＷ等の電気部品用のメタライズ材
に、NiメツキやAuメツキなどを施したものであ
つて、耐蝕性を要する場合には、接液部のみPt
メタライズ加工またはAuメタライズ加工が施さ
れる。こうすることにより、測定管１の内孔を流
れる流体とケース３とは、メタライズ部１０，１
１と、コイルボビン５とで短絡される。 On both open end surfaces 1a and 1b of the measuring tube 1, a metal metallization process is applied to the ceramic surface.
As shown in the figure, a metallized portion 10 consisting of an annular portion and a radius portion is formed, and these metalized portions 10 on both sides are connected by a similar band-shaped metallized portion 11 formed in the direction of the outer peripheral ridgeline of the measuring tube 1. has been done. The material of the metallized parts 10 and 11 is Mo.
- If the metallized material for electrical parts such as Mn or W is coated with Ni plating or Au plating, and if corrosion resistance is required, only the parts in contact with liquid should be plated with Pt.
Metalized or Au metalized. By doing this, the fluid flowing through the inner hole of the measuring tube 1 and the case 3 are connected to the metallized parts 10 and 1.
1 and the coil bobbin 5 are short-circuited.
以上のように構成された電磁流量計の動作を説
明する。励磁コイル６を励磁し、測定管１内を導
電性流体が流れると、励磁コイル６の磁界方向と
流体の流れ方向とにそれぞれ直交する電極２間に
は、平均流量に比例した起電力が発生するので、
これがリード線８を経て端子箱または変換器に導
かれ、電気信号に変換されて流量が測定される。 The operation of the electromagnetic flowmeter configured as above will be explained. When the excitation coil 6 is excited and a conductive fluid flows in the measuring tube 1, an electromotive force proportional to the average flow rate is generated between the electrodes 2 that are perpendicular to the magnetic field direction of the excitation coil 6 and the flow direction of the fluid. So,
This is led to a terminal box or converter via lead wire 8, where it is converted into an electrical signal and the flow rate is measured.
この場合、導電性流体とケース３とがメタライ
ズ部１０，１１とコイルボビン５とで電気的に導
通されているので、流量計全体が流体と同じ基準
電位を保持し、電極２による起電力の取出しが精
度よく行われる。 In this case, since the conductive fluid and the case 3 are electrically connected by the metallized parts 10 and 11 and the coil bobbin 5, the entire flowmeter maintains the same reference potential as the fluid, and the electromotive force is extracted by the electrode 2. is performed with high precision.
なお、本実施例では帯状メタライズ部１１を測
定管１周面の両側に設けた例を示したが、片側だ
けでもよく、この場合には、メタライズ部１０の
半径部も片側だけでよい。また、メタライズ部１
０を端面１ａ，１ｂの一部だけではなくて全面に
設けてもよい。Ｏリング溝１ｆ内にもメタライズ
部を設ければ、Ｏリング溝１ｆに帯の段が付かな
いのでシールに対して良い結果が得られる。 Although this embodiment shows an example in which the band-shaped metallized portion 11 is provided on both sides of the circumferential surface of the measuring tube 1, it may be provided on only one side, and in this case, the radius portion of the metalized portion 10 may also be provided on only one side. In addition, the metallized part 1
0 may be provided not only on a part of the end surfaces 1a and 1b but also on the entire surface. If a metallized portion is also provided in the O-ring groove 1f, good sealing results can be obtained since the O-ring groove 1f is not stepped.
〔発明の効果〕
以上の説明により明らかなように本発明によれ
ば電磁流量計において、一部を接液させたセラミ
ツク製測定管の両開口端面に形成した両方のメタ
ライズ部を、測定管の外周部稜線方向に形成した
帯状のメタライズ部で接続し、この帯状メタライ
ズ部に接して配設したコイルユニツトを介しコイ
ルボビンを流量計ケースにねじ止めしたことによ
り、被測定流体と流量計全体とは、測定管両端の
メタライズ部とこれを接続する帯状のメタライズ
部およびコイルボビンで電気導通されるので、リ
ード線による導通のように断線したりするおそれ
がなく安定した導通が得られ信頼性が向上する。
また、部品点数と組立工数が少なく安価に提供で
きるとともに、測定管の交換が容易で作業性が向
上する。[Effects of the Invention] As is clear from the above description, in an electromagnetic flowmeter according to the present invention, both metallized portions formed on both open end faces of a ceramic measuring tube partially in contact with liquid are removed from the measuring tube. The coil bobbin is connected to the flow meter case by a band-shaped metallized part formed in the direction of the outer periphery ridge line, and the coil bobbin is screwed to the flow meter case via the coil unit placed in contact with this band-shaped metallized part, thereby making it possible to connect the fluid to be measured and the flow meter as a whole. Since electrical continuity is established between the metallized parts at both ends of the measuring tube, the band-shaped metallized part that connects them, and the coil bobbin, stable conduction is obtained without the risk of disconnection as with lead wires, and reliability is improved. .
In addition, the number of parts and assembly steps are small, making it possible to provide the device at a low cost, and the measurement tube can be easily replaced, improving work efficiency.
第１図ないし第４図は本発明に係る電磁流量計
の実施例を示し、第１図はその縦断面図、第２図
は同じく側断面図、第３図は測定管の平面図、第
４図は同じく側面図である。
１……測定管、１ａ，１ｂ……開口端面、１ｄ
……コイル装着用凹陥部、３……計器ケース、４
……Ｏリング、５……コイルボビン、６……励磁
コイル、７……コイルユニツト、１０，１１……
メタライズ部。
1 to 4 show an embodiment of the electromagnetic flowmeter according to the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a side sectional view, and FIG. 3 is a plan view of a measuring tube. Figure 4 is also a side view. 1...Measuring tube, 1a, 1b...Open end surface, 1d
... Recessed part for installing coil, 3 ... Instrument case, 4
... O-ring, 5 ... Coil bobbin, 6 ... Excitation coil, 7 ... Coil unit, 10, 11 ...
Metallization section.
Claims (1)
製測定管の両開口端面に形成してこれら両メタラ
イズ部を前記測定管の外周部稜線方向に形成した
帯状のメタライズ部で接続するとともに、この帯
状メタライズ部に接して配設したコイルユニツト
を介しコイルボビンを流量計ケースにねじ止めし
たことを特徴とする電磁流量計。1 Metalized parts, some of which are in contact with the liquid, are formed on both opening end surfaces of a ceramic measuring tube, and these metalized parts are connected by a band-shaped metalized part formed in the direction of the ridgeline of the outer circumference of the measuring tube. An electromagnetic flowmeter characterized in that a coil bobbin is screwed to a flowmeter case via a coil unit placed in contact with a metallized part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28101787A JPH01123113A (en) | 1987-11-09 | 1987-11-09 | Electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28101787A JPH01123113A (en) | 1987-11-09 | 1987-11-09 | Electromagnetic flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01123113A JPH01123113A (en) | 1989-05-16 |
| JPH0477253B2 true JPH0477253B2 (en) | 1992-12-07 |
Family
ID=17633125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28101787A Granted JPH01123113A (en) | 1987-11-09 | 1987-11-09 | Electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01123113A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5427563B2 (en) | 2009-11-20 | 2014-02-26 | 三菱重工業株式会社 | Inverter turbo refrigerator performance evaluation system |
| JP5523972B2 (en) | 2010-07-29 | 2014-06-18 | 三菱重工業株式会社 | Turbo refrigerator performance evaluation device |
-
1987
- 1987-11-09 JP JP28101787A patent/JPH01123113A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01123113A (en) | 1989-05-16 |
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