JPH0450743A - Differential pressure transmitter - Google Patents
Differential pressure transmitterInfo
- Publication number
- JPH0450743A JPH0450743A JP15865690A JP15865690A JPH0450743A JP H0450743 A JPH0450743 A JP H0450743A JP 15865690 A JP15865690 A JP 15865690A JP 15865690 A JP15865690 A JP 15865690A JP H0450743 A JPH0450743 A JP H0450743A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- medium passage
- differential pressure
- passage
- pressure medium
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000005192 partition Methods 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract description 18
- 238000012545 processing Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 238000012937 correction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は各種のプラント等で使用される差圧伝送器に関
する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a differential pressure transmitter used in various plants and the like.
（従来の技術）
各種のプラント等で使用される差圧伝送器の１つとして
、従来、第４図に示すものが知られている。(Prior Art) As one of the differential pressure transmitters used in various plants, the one shown in FIG. 4 is conventionally known.
この図に示す差圧伝送器は厚板状に形成されるブロック
部１０１と、このブロック部１０１の両側に各々設けら
れる受圧フランジ部１０２とを備えており、各受圧フラ
ンジ部１０２に接続された各プロセス配管工０３ａ、１
０３ｂの圧力差を検出してこれを外部に伝送する。The differential pressure transmitter shown in this figure includes a block part 101 formed in a thick plate shape, and pressure receiving flange parts 102 provided on both sides of this block part 101, and a pressure receiving flange part 102 connected to each pressure receiving flange part 102. Each process plumber 03a, 1
03b is detected and transmitted to the outside.
ブロック部１０１は厚板状に形成されるブロック本体１
０５と、このブロック本体１０５の両面に形成された各
凹部１０６を各々覆うように設けられる隔壁ダイヤフラ
ム１０７と、前記各凹部１０６を連通させるように前記
ブロック本体１０５内に形成された圧力媒体通路１０８
のほぼ中央部分に設けられる差圧検出素子１０９と、前
記圧力媒体通路１０８と前記ブロック本体１０５の上部
とを貫通するように前記ブロック本体１０５内に形成さ
れた信号線用穴１１０に挿通され前記差圧検出素子１０
９の出力を外部に導く信号線１１１と、前記ブロック本
体１０５の前記信号線用穴１１０を塞ぎながら前記信号
線１１１を外部に導くハーメチックシール１１２と、前
記各隔壁ダイヤフラム１０７によって密閉された前記圧
力媒体通路１０８内および信号線用穴１１０に充填され
るシリコーンオイル、エチレングリコール等の圧力媒体
１１３とを備えている。The block part 101 is a block body 1 formed in a thick plate shape.
05, a partition diaphragm 107 provided to cover each recess 106 formed on both sides of this block body 105, and a pressure medium passage 108 formed in the block body 105 so as to communicate each recess 106.
A differential pressure detecting element 109 provided approximately in the center of the block body 105 is inserted into a signal line hole 110 formed in the block body 105 so as to pass through the pressure medium passage 108 and the upper part of the block body 105. Differential pressure detection element 10
9 to the outside, a hermetic seal 112 that guides the signal line 111 to the outside while closing the signal line hole 110 of the block body 105, and the pressure sealed by each partition diaphragm 107. A pressure medium 113 such as silicone oil or ethylene glycol is provided to be filled in the medium passage 108 and the signal line hole 110.
また、各受圧フランジ部１０２は各々前記ブロック本体
１０５の各面を覆うように設けられる厚板状のフランジ
本体１１５と、このフランジ本体１１５の前記隔壁ダイ
ヤフラム１０７側に形成された周囲溝１１６内に嵌入さ
れるパツキン１１７と、これらの各フランジ本体１１５
を前記ブロック本体１０５の画面に密着させるボルトナ
ンド機構１１８とを備えており、前記プロセス配管１０
３ａ、１０３ｂの圧力を前記フランジ本体１１５の上部
に形成された通路穴１１９を介して前記フランジ本体１
１５の前記隔壁ダイヤフラム側に形成された凹部１２０
に導く。Further, each pressure receiving flange portion 102 includes a thick plate-shaped flange body 115 provided so as to cover each surface of the block body 105, and a peripheral groove 116 formed on the partition wall diaphragm 107 side of this flange body 115. The packing 117 to be fitted and each of these flange bodies 115
and a bolt nand mechanism 118 that brings the process piping 10 into close contact with the screen of the block body 105.
3a, 103b is applied to the flange body 1 through a passage hole 119 formed in the upper part of the flange body 115.
A recess 120 formed on the partition wall diaphragm side of No. 15
lead to.
そして、各プロセス配管１０３ａ、１０３ｂからの圧力
によって各隔壁ダイヤフラム１０７が歪めば、これに応
じて差圧検出素子１０９の各両番こ加えられる圧力に差
が生じて、これが差圧検出素子１０９によって検出され
、この検呂結果が信号線１１１を介して外部に８力され
る。If each partition diaphragm 107 is distorted by the pressure from each process pipe 103a, 103b, a difference will occur in the pressure applied to each side of the differential pressure detecting element 109, and this will be caused by the differential pressure detecting element 109. It is detected, and the test result is outputted to the outside via the signal line 111.
また、このような差圧伝送器以外にも、種々の構造のも
のも知られているが、原理的には間様な測定原理に基づ
いている。In addition to such differential pressure transmitters, various structures are known, but they are based on different measurement principles.
（発明が解決しようとする課題）
しかしながらこのような差圧伝送器では、経年変化や過
大圧力等によってごくわずかな永久歪みが生じ、これが
原因で零点ドリフトを起こすことがある。(Problem to be Solved by the Invention) However, in such a differential pressure transmitter, slight permanent distortion occurs due to aging, excessive pressure, etc., and this may cause zero point drift.
そこで、このような差圧伝送器においては、据付は時に
各プロセス配管１０３ａ、１０３ｂに予めバイパス管１
２１を掛は渡すとともに、これら各プロセス配管１０３
ａ、１０３ｂおよびバイパス管１２１にストップ弁１２
２ａ、１２２ｂ、１２２ｃを各々取り付けて三岐弁機構
を構成し、零点調整時にはバイパス管１２１に設けられ
たストップ弁１２２ｃを開状態にするとともに、各プロ
セス配管１０３ａ、１０３ｂに設けられたストップ弁１
２２ａ、１２２ｂを閉状態にして差圧検出素子１０９に
加えられる圧力を同一にし、この差圧検出素子１０９か
ら出力される信号のオフセット量を測定した後、バイパ
ス管１２１に設けられたストップ弁１２２ｃを閉状態に
するとともに、各プロセス配管１０３ａ、１０３ｂに設
けられたストップ弁１２２ａ、１２２ｂを開状態にして
差圧測定を行なうようにしている。Therefore, when installing such a differential pressure transmitter, a bypass pipe 1 is sometimes installed in each process pipe 103a, 103b in advance.
21, and each of these process piping 103
a, 103b and the stop valve 12 in the bypass pipe 121.
2a, 122b, and 122c are respectively attached to form a three-way valve mechanism, and when adjusting the zero point, the stop valve 122c provided in the bypass pipe 121 is opened, and the stop valve 1 provided in each process pipe 103a, 103b is opened.
22a and 122b are closed to make the pressure applied to the differential pressure detection element 109 the same, and after measuring the offset amount of the signal output from the differential pressure detection element 109, the stop valve 122c provided in the bypass pipe 121 is closed. is closed, and stop valves 122a and 122b provided in each process pipe 103a and 103b are opened to measure the differential pressure.
しかしながら、このような方法では、遠隔地から三岐弁
機構を操作することができないため、零点調整時には差
圧伝送器が設置されている場所まで行って三岐弁機構を
操作しなければならず、不便であった。However, with this method, it is not possible to operate the three-way valve mechanism from a remote location, so when adjusting the zero point, it is necessary to go to the location where the differential pressure transmitter is installed and operate the three-way valve mechanism. , it was inconvenient.
本発明は上記の事情に鑑み、差圧伝送器外に設置しであ
る三岐弁機構を操作しなくても、遠隔地において誤差の
少ない零点調整を行なうことができる差圧伝送器を提供
することを目的としている。In view of the above circumstances, the present invention provides a differential pressure transmitter that can perform zero point adjustment with less error at a remote location without operating a three-way valve mechanism installed outside the differential pressure transmitter. The purpose is to
（課題を解決するための手段）
上記の目的を達成するために本発明による差圧伝送器は
、ブロック本体内に形成された圧力媒体通路を遮る位置
に設けられる差圧検出素子と、前記圧力媒体通路の両端
を各々閉じる隔壁ダイヤフラムと、前記圧力媒体通路の
差圧検出素子の各面側をバイパスするバイパス路と、こ
のバイパス路と前記圧力媒体通路の接続部分に設けられ
、バイパス路の開通および圧力媒体通路の遮断と、バイ
パス路の遮断および圧力媒体通路の開通とを切り替える
弁機構とを備えたことを特徴としている。(Means for Solving the Problems) In order to achieve the above object, a differential pressure transmitter according to the present invention includes a differential pressure detection element provided at a position that blocks a pressure medium passage formed in a block body, and a pressure A partition diaphragm that closes both ends of the medium passage, a bypass passage that bypasses each side of the differential pressure detection element of the pressure medium passage, and a bypass passage that bypasses each side of the differential pressure detection element of the pressure medium passage, and a bypass passage that is provided at a connecting portion between the bypass passage and the pressure medium passage, and is provided to open the bypass passage. and a valve mechanism that switches between blocking the pressure medium passage, blocking the bypass passage, and opening the pressure medium passage.
（作用）
上記の構成において、差圧検出時には弁機構によってバ
イパス路を閉じるとともに、圧力媒体通路を開いて各隔
壁ダイヤフラムに加えられた圧力を差圧検出素子の各面
に導き、また零点調整時には弁機構を切り替えて圧力媒
体通路の一方を閉じるとともに、バイパス路を開いて差
圧検出素子の両面に加わる圧力を同じにする。(Function) In the above configuration, when differential pressure is detected, the bypass passage is closed by the valve mechanism, and the pressure medium passage is opened to guide the pressure applied to each partition diaphragm to each surface of the differential pressure detection element. The valve mechanism is switched to close one of the pressure medium passages, and the bypass passage is opened to equalize the pressure applied to both sides of the differential pressure detection element.
（実施例）
第１図は本発明による差圧伝送器の一実施例を示す断面
図である。(Embodiment) FIG. 1 is a sectional view showing an embodiment of a differential pressure transmitter according to the present invention.
この図に示す差圧伝送器は厚板状に形成されるブロック
部１と、このブロック部１の両側に各々設けられる受圧
フランジ部２と、前記ブロック部１の駆動およびこのブ
ロック部１からの信号処理を行なう信号処理回路３とを
備えており、各受圧フランジ部２に接続された各プロセ
ス配管４ａ、４ｂの圧力差を検出してこれを信号処理回
路３を介して外部に伝送する。また、外部から零点調整
信号が供給されたときには信号処理回路３によってブロ
ック部１を駆動して零点調整を行なわせる。The differential pressure transmitter shown in this figure includes a block portion 1 formed in the shape of a thick plate, pressure receiving flange portions 2 provided on both sides of the block portion 1, and drive and control of the block portion 1 and the pressure receiving flange portions 2 provided on both sides of the block portion 1. It is equipped with a signal processing circuit 3 that performs signal processing, detects the pressure difference between each process pipe 4a, 4b connected to each pressure receiving flange portion 2, and transmits this to the outside via the signal processing circuit 3. Further, when a zero point adjustment signal is supplied from the outside, the signal processing circuit 3 drives the block section 1 to perform the zero point adjustment.
ブロック部１は厚板状に形成されるブロック本体５と、
このブロック本体５の両面に形成された各凹部６を各々
覆うように設けられる隔壁ダイヤフラム７と、前記各凹
部６を連通させるように前記ブロック本体５内に形成さ
れた絞り８を有するＵ字型圧力媒体通路９の中央部分に
設けられる半導体式の差圧検出素子１０と、この差圧検
出素子１０の各面を連通させるように前記Ｕ字型圧力媒
体通路９の所要部分を連通させるバイパス路１１と前記
Ｕ字型圧力媒体通路９との接続部分に設けられる弁機構
１２とを備えている。The block part 1 includes a block body 5 formed in a thick plate shape,
A U-shaped partition wall diaphragm 7 provided to cover each recess 6 formed on both sides of the block body 5, and a diaphragm 8 formed within the block body 5 so as to communicate the recesses 6. A semiconductor type differential pressure detection element 10 provided in the center of the pressure medium passage 9 and a bypass path that communicates required parts of the U-shaped pressure medium passage 9 so as to communicate each surface of the differential pressure detection element 10. 11 and a valve mechanism 12 provided at a connecting portion with the U-shaped pressure medium passage 9.
さらに、前記ブロック部１は前記Ｕ字型圧力媒体通路９
と前記ブロック本体５の上部とを貫通するように前記ブ
ロック本体５内に形成された信号線用穴１３に挿通され
前記差圧検出素子１０の出力を外部の信号処理回路３に
導く信号線１４と、前記信号線用穴１３に挿通され前記
信号処理回路３の駆動電圧を前記弁機構１２に導く信号
線１５と、前記ブロック本体５の前記信号線用穴１３を
塞ぎながら前記各信号１！１４．１５を外部に導くハー
メチックシール１６と、前記各隔壁ダイヤフラム７によ
って密閉された前記Ｕ字型圧力媒体通路９内およびバイ
パス路１１内、信号線用穴１３内に充填されるシリコー
ンオイル、エチレングリコール等の圧力伝達媒体１７と
を備えている。Further, the block portion 1 is configured to include the U-shaped pressure medium passage 9.
and a signal line 14 that is inserted into a signal line hole 13 formed in the block body 5 so as to pass through the upper part of the block body 5 and leads the output of the differential pressure detection element 10 to the external signal processing circuit 3. , the signal line 15 inserted through the signal line hole 13 and guiding the drive voltage of the signal processing circuit 3 to the valve mechanism 12, and each signal 1! while closing the signal line hole 13 of the block body 5! Silicone oil and ethylene are filled in the hermetic seal 16 that guides 14.15 to the outside, the U-shaped pressure medium passage 9 sealed by each partition diaphragm 7, the bypass passage 11, and the signal line hole 13. A pressure transmission medium 17 such as glycol is provided.
前記弁機構１２は第２図（ａ）に示す如くバイパス路１
１とＵ字型圧力媒体通路９との接続部分に形成されたチ
ャンバー１８内に収納される弁１９と、前記チャンバー
１８に設けられた穴部２゜にスライド自在に挿通され前
記弁１９を矢印Ａ、Ｂ方向にスライド自在に支持する駆
動軸２１と、前記穴部２０内に収納され駆動軸２１を矢
印Ａ方向に付勢して前記弁１９に形成された一方の二ド
ル部１９ａによって前記Ｕ字型圧力媒体通路９の高圧側
上流部分９ａａを閉じさせるとともに、前記バイパス路
１１と前記Ｕ字型圧カ媒体通路９の高圧側下流部分９ａ
ｂとを連通させるバネ２２とを備えている。The valve mechanism 12 is connected to the bypass passage 1 as shown in FIG. 2(a).
1 and a U-shaped pressure medium passage 9, the valve 19 is housed in a chamber 18, and the valve 19 is slidably inserted into a hole 2° provided in the chamber 18, and the valve 19 is indicated by the arrow. The drive shaft 21 is slidably supported in the directions A and B, and the drive shaft 21 is accommodated in the hole 20 and biased in the direction of the arrow A. The high-pressure side upstream portion 9aa of the U-shaped pressure medium passage 9 is closed, and the bypass passage 11 and the high-pressure side downstream portion 9a of the U-shaped pressure medium passage 9 are closed.
and a spring 22 that communicates with b.
さらに、前記弁機構１２は前記穴部２０の周囲に埋設さ
れ前記信号線１５を介して駆動電圧が供給されたとき前
記駆動軸２１を矢βμＢ方向に付勢して前記弁１９に形
成された他方のニードル部１９ｂによってバイパス路１
１を閉じさせるとともに、前記Ｕ字型圧力媒体通路９の
高圧側上流部９ａａを開いてこのＵ字型圧力媒体通路９
の高圧側と流部９ａａと高圧側下流部分９ａｂとを連通
させる駆動コイル２３とを備えている。Furthermore, the valve mechanism 12 is embedded around the hole 20 and is formed in the valve 19 by urging the drive shaft 21 in the direction of arrow βμB when a drive voltage is supplied through the signal line 15. Bypass path 1 by the other needle portion 19b
1 is closed, and the high pressure side upstream portion 9aa of the U-shaped pressure medium passage 9 is opened to open the U-shaped pressure medium passage 9.
A drive coil 23 is provided that communicates the high pressure side of the flow section 9aa and the high pressure side downstream portion 9ab.
また、各受圧フランジ部２は各々前記ブロック本体５の
各面を覆うように設けられる厚板状のフランジ本体２６
と、このフランジ本体２６の前記隔壁ダイヤフラム７側
に形成された周囲溝２７内に嵌入されるパツキン２８と
、これらの各フランジ本体２６を前記ブロック本体５の
両面に密着させるボルトナツト機構２９とを備えており
、前記プロセス配管４ａ、４ｂの圧力を前記フランジ本
体２６の上部に形成された通路穴３０を介して前記フラ
ンジ本体２６の前記隔壁ダイヤフラム７側に形成された
凹部３１に導く。Further, each pressure receiving flange portion 2 has a thick plate-shaped flange body 26 provided so as to cover each surface of the block body 5.
A packing 28 is fitted into a circumferential groove 27 formed on the partition wall diaphragm 7 side of the flange body 26, and a bolt and nut mechanism 29 that brings each of the flange bodies 26 into close contact with both sides of the block body 5. The pressure in the process pipes 4a and 4b is guided to a recess 31 formed on the partition wall diaphragm 7 side of the flange main body 26 through a passage hole 30 formed in the upper part of the flange main body 26.
また、信号処理回路３は第３図に示す如く前記信号線１
４を介して供給される前記差圧検出素子１０からの差圧
検出信号を増幅する増幅増幅器３５と、Ａ／Ｄ変換部３
４を持ち前記増幅器３５から供給される差圧検出信号を
Ａ／Ｄ変換した後、予め設定されている各種の補正処理
、演算処理を行なうマイクロプロセッサ３６と、このマ
イクロプロセッサ３６の作業エリア等として使用される
メモリ３７とを備えている。Further, the signal processing circuit 3 includes the signal line 1 as shown in FIG.
an amplifier 35 for amplifying the differential pressure detection signal from the differential pressure detection element 10 supplied via the A/D converter 3;
4, which performs A/D conversion of the differential pressure detection signal supplied from the amplifier 35, and then performs various preset correction processing and arithmetic processing, and a working area of this microprocessor 36. A memory 37 is also provided.
さらに、前記信号処理回路３は前記マイクロプロセッサ
３６の処理結果をＤ／Ａ変換するＤ／Ａ変換器３８と、
このＤ／Ａ変換器３８の高力に基づいて２線式伝送ライ
ン４１を介して外部から供給された電流を変調して差圧
検出信号を外部に伝送する変調器３９と、外部から入力
された零点調整信号によって動作するスイッチ４３と、
このスイッチ４３が零点調整位置になっているとき駆動
電圧の発生を停止して前記弁機構１２の駆動コイル２３
への通電を停止する弁駆動回路４０とを備えている。Further, the signal processing circuit 3 includes a D/A converter 38 for D/A converting the processing result of the microprocessor 36;
A modulator 39 modulates the current supplied from the outside via the two-wire transmission line 41 based on the high power of the D/A converter 38, and transmits a differential pressure detection signal to the outside. a switch 43 operated by the zero point adjustment signal;
When this switch 43 is in the zero point adjustment position, the generation of drive voltage is stopped and the drive coil 23 of the valve mechanism 12 is
The valve drive circuit 40 is provided with a valve drive circuit 40 that stops energizing the valve.
次に、この実施例の差圧検出動作と、零点調整動作とを
順次説明する。Next, the differential pressure detection operation and zero point adjustment operation of this embodiment will be sequentially explained.
まず、差圧検出動作においては、高圧側に加わった圧力
Ｐａは隔壁ダイヤフラム７を介して圧力伝達媒体１７に
伝達された後、この圧力伝達媒体１７が充填されている
Ｕ字型圧力媒体通路９の高圧側上流部分９ａａを介して
弁機構１２に伝達される。First, in the differential pressure detection operation, the pressure Pa applied to the high pressure side is transmitted to the pressure transmission medium 17 via the partition diaphragm 7, and then the U-shaped pressure medium passage 9 filled with this pressure transmission medium 17 is transmitted to the valve mechanism 12 via the high-pressure side upstream portion 9aa.
ここで、差圧横比時には第２図（ｂ）に示す如く駆動コ
イル２３によって駆動軸２１が矢印Ｂ方向に付勢され、
弁１９のニードル部１９ｂがバイパス路１１を閉じると
ともに、前記Ｕ空圧力媒体通路９の高圧側上流部分９ａ
ａを開いているので、Ｕ字型圧力媒体通路９の高圧側上
流部分９ａａからの圧力はＵ字型圧力媒体通路９の低圧
側上流部分９ｂａおよび低圧側下流部分９ｂｂには伝わ
らずに、Ｕ字型圧力媒体通路９の高圧側下流部分９ａｂ
を介して差圧検出素子１ｏの一面側にのみ伝えられる。Here, at the time of differential pressure transverse ratio, the drive shaft 21 is urged in the direction of arrow B by the drive coil 23 as shown in FIG. 2(b).
The needle portion 19b of the valve 19 closes the bypass passage 11 and closes the high pressure side upstream portion 9a of the U air pressure medium passage 9.
a is open, the pressure from the high-pressure side upstream portion 9aa of the U-shaped pressure medium passage 9 is not transmitted to the low-pressure side upstream portion 9ba and the low-pressure side downstream portion 9bb of the U-shaped pressure medium passage 9; High pressure side downstream portion 9ab of the shape pressure medium passage 9
It is transmitted only to one side of the differential pressure detection element 1o via the.
一方、低圧側に加わった圧力ｐｂは隔壁ダイヤフラム７
を介して圧力伝達媒体１７に伝達された後、この圧力伝
達媒体１７が充填されているＵ字型圧力媒体通路９の低
圧側上流部分９ｂａ、低圧側下流部分９ｂｂを介して差
圧検出素子１０の他面側に伝えられる。On the other hand, the pressure pb applied to the low pressure side is
After being transmitted to the pressure transmission medium 17 via the pressure transmission medium 17, the pressure transmission medium 17 is transmitted to the differential pressure detection element 10 via the low pressure side upstream portion 9ba and the low pressure side downstream portion 9bb of the U-shaped pressure medium passage 9 filled with the pressure transmission medium 17. is transmitted to the other side.
このとき、弁機構１２によってバイパス路１１が閉じら
れているので、Ｕ字型圧力媒体通路９の低圧側の圧力は
Ｕ字型圧力媒体通路９の高圧側には伝わらない。At this time, since the bypass passage 11 is closed by the valve mechanism 12, the pressure on the low pressure side of the U-shaped pressure medium passage 9 is not transmitted to the high pressure side of the U-shaped pressure medium passage 9.
したがって、この状態では差圧検出素子１０はその両面
に加えられている圧力Ｐａ、Ｐｂの差圧に応じた値の差
圧検出信号を発生するとともに、これを信号線１４を介
して信号処理回路３に供給する。Therefore, in this state, the differential pressure detection element 10 generates a differential pressure detection signal having a value corresponding to the pressure difference between the pressures Pa and Pb applied to both sides thereof, and sends this signal to the signal processing circuit via the signal line 14. Supply to 3.
そして、信号処理回路３のマイクロプロセッサ３６は増
幅器３５を介して差圧検出信号が供給されると、これを
Ａ／Ｄ変換して取り込むとともに、補正処理、演算処理
等を施した後、Ｄ／Ａ変換器３８に供給してＤ／Ａ変換
させて変調器３９に供給させる。Then, when the microprocessor 36 of the signal processing circuit 3 is supplied with the differential pressure detection signal via the amplifier 35, it A/D converts and takes in the signal, and after performing correction processing, arithmetic processing, etc. The signal is supplied to an A converter 38 for D/A conversion and supplied to a modulator 39.
これによって、変調器３９は外部から供給される電流を
変調して前記Ｄ／Ａ変換器３８から供給された差圧検出
信号を外部に伝える。Thereby, the modulator 39 modulates the current supplied from the outside and transmits the differential pressure detection signal supplied from the D/A converter 38 to the outside.
また、零点調整動作時には、まず外部からの指示によっ
てスイッチ４３が零点調整位置にされ、これに対応して
弁駆動回路４０は駆動コイル２３への通電を停止する。Further, during the zero point adjustment operation, the switch 43 is first set to the zero point adjustment position by an instruction from the outside, and in response, the valve drive circuit 40 stops energizing the drive coil 23.
これによって、第２図（ａ）に示す如くバネ２２によっ
て駆動軸２１が矢印Ａ方向に付勢され、弁１９のニード
ル部１９ａがＵ字型圧力媒体通路９の高圧側上流部分９
ａａを閉じるとともに、バイパス路１１とＵ字型圧力媒
体通路９の高圧側下流部分９ａｂとを連通させる。As a result, the drive shaft 21 is urged in the direction of arrow A by the spring 22 as shown in FIG.
aa is closed, and the bypass passage 11 and the high-pressure side downstream portion 9ab of the U-shaped pressure medium passage 9 are made to communicate with each other.
この結果、Ｕ字型圧力媒体通路９の高圧側上流部分９ａ
ａからの圧力はＵ字型圧力媒体通路９の高圧側下流部分
９ａｂには伝わらずに、Ｕ字型圧力媒体通路９の低圧側
下流部分９ｂｂの圧力がＵ字型圧力媒体通路９の高圧側
下流部分９ａｂに伝わり、差圧検出素子１０の両面に圧
力ｐｂが加わる。またこのとき、Ｕ字型圧力媒体通路９
の高圧側上流部分９ａａと、低圧側上流部分９ｈａとに
設けられた絞り８によってＵ字型圧力媒体通路９の高圧
側上流部分Ｑａａ側および低圧側上流部分９ｂａ側から
Ｕ字型圧力媒体通路９の高圧側下流部分Ｑａｂ側および
低圧側下流部分９ｂｂ側に流れ込む圧力伝達媒体１７の
移動が抑制される。As a result, the high pressure side upstream portion 9a of the U-shaped pressure medium passage 9
The pressure from a is not transmitted to the high pressure side downstream portion 9ab of the U-shaped pressure medium passage 9, and the pressure in the low pressure side downstream portion 9bb of the U-shaped pressure medium passage 9 is transferred to the high pressure side of the U-shaped pressure medium passage 9. The pressure pb is transmitted to the downstream portion 9ab, and pressure pb is applied to both sides of the differential pressure detection element 10. Also at this time, the U-shaped pressure medium passage 9
The U-shaped pressure medium passage 9 is connected from the high pressure side upstream portion Qaa side and the low pressure side upstream portion 9ba side of the U-shaped pressure medium passage 9 by the throttle 8 provided in the high pressure side upstream portion 9aa and the low pressure side upstream portion 9ha of the U-shaped pressure medium passage 9. Movement of the pressure transmission medium 17 flowing into the high-pressure side downstream portion Qab side and the low-pressure side downstream portion 9bb side is suppressed.
したがって、この状態では差圧検出素子１０から差圧が
零のときにおける差圧検出信号が出力され、これが信号
線１４を介して信号処理回路３に供給されて増幅された
後、Ａ／Ｄ変換されてデジタル処理による補正処理、演
算処理等が施された後、Ｄ／Ａ変換されて変調器３９を
介して外部に出力される。Therefore, in this state, the differential pressure detection element 10 outputs a differential pressure detection signal when the differential pressure is zero, and this is supplied to the signal processing circuit 3 via the signal line 14 and amplified, and then A/D converted. After being subjected to correction processing, arithmetic processing, etc. by digital processing, it is D/A converted and outputted to the outside via a modulator 39.
このようにこの実施例においては、Ｕ字型圧力媒体通路
９とバイパス路１１との接続部分に弁機構１２を設け、
差圧検出時には弁機構１２によってＵ字型圧力媒体通路
９の高圧側上流部分９ａａと、Ｕ字型圧力媒体通路９の
高圧側下流部分９ａｂとを連通させるとともに、バイパ
ス路１１を閉じて各隔壁ダイヤフラム７に加えられた圧
力Ｐａ、Ｐｂを差圧検出素子１０の各面に導き、また零
点調整時には弁機構１２を切り替えてＵ字型圧力媒体通
路９の高圧側上流部分９ａａを閉じるとともに、バイパ
ス路１１を開いてＵ字型圧力媒体通路９の低圧側下流部
分９ｂｂと、Ｕ字型圧力媒体通路９の高圧側下流部分ａ
ｂとを連通させて差圧検出素子１０の各面に圧力ｐｂが
加わるようにしたので、差圧伝送器外に設置しである三
核弁機構を操作しなくても、外部からスイッチ４３を制
御するだけで遠隔地において誤差の少ない零点調整を行
なうことができる。As described above, in this embodiment, the valve mechanism 12 is provided at the connection portion between the U-shaped pressure medium passage 9 and the bypass passage 11,
When differential pressure is detected, the valve mechanism 12 connects the high-pressure side upstream portion 9aa of the U-shaped pressure medium passage 9 and the high-pressure side downstream portion 9ab of the U-shaped pressure medium passage 9, closes the bypass passage 11, and closes each partition wall. The pressures Pa and Pb applied to the diaphragm 7 are guided to each surface of the differential pressure detection element 10, and when adjusting the zero point, the valve mechanism 12 is switched to close the high-pressure side upstream portion 9aa of the U-shaped pressure medium passage 9, and the bypass The passage 11 is opened to connect the low-pressure side downstream portion 9bb of the U-shaped pressure medium passage 9 and the high-pressure side downstream portion a of the U-shaped pressure medium passage 9.
Since the pressure pb is applied to each surface of the differential pressure detection element 10 by communicating with Zero point adjustment with little error can be performed at a remote location simply by controlling the system.
また、この実施例においては、１つの弁機構１２の１動
作でＵ字型圧力媒体通路９の高圧側上流部分９ａａの遮
断と、バイパス路１１の開通とを行なうことができるの
で、土岐弁機構を用いる場合より構造を簡単にすること
ができるとともに、低消費電力で駆動することができる
。Furthermore, in this embodiment, the high-pressure side upstream portion 9aa of the U-shaped pressure medium passage 9 can be shut off and the bypass passage 11 can be opened by one operation of one valve mechanism 12. The structure can be made simpler than when using , and it can be driven with lower power consumption.
また、この実施例においては、弁機構１２を動作させて
もＵ字型圧力媒体通路９内やバイパス路１１内にある圧
力伝達媒体１７がほとんど移動しないので、誤差の発生
を最小にすることができる。Furthermore, in this embodiment, even when the valve mechanism 12 is operated, the pressure transmission medium 17 in the U-shaped pressure medium passage 9 and the bypass passage 11 hardly moves, so it is possible to minimize the occurrence of errors. can.
また、この実施例においては、Ｕ字型圧力媒体通路９の
高圧側上流部分９ａａと低圧側上流部分９ｂａとに絞り
８を設けているので、零点調整を行なったとき、圧力伝
達媒体１７の移動を少なくして差圧が零になるまでの時
間を短くすることができる。Furthermore, in this embodiment, since the throttles 8 are provided in the high-pressure side upstream portion 9aa and the low-pressure side upstream portion 9ba of the U-shaped pressure medium passage 9, the movement of the pressure transmission medium 17 is reduced when zero point adjustment is performed. The time required for the differential pressure to reach zero can be shortened by reducing the
さらに、ブロック本体５内部に弁機構１２を設けている
ので、外部に弁機構を設けたときのように、プロセス配
管４ａ、４ｂ内の流体中に含まる異物等による詰まりゃ
腐蝕による誤動作の恐れを完全に無くすことができる。Furthermore, since the valve mechanism 12 is provided inside the block body 5, there is a risk of malfunction due to corrosion if the process piping 4a, 4b is clogged with foreign matter contained in the fluid, unlike when the valve mechanism is provided externally. can be completely eliminated.
また、上述した実施例においては、差圧検出素子１０と
して半導体感圧素子を使用するようにしているが、静電
容量式の差圧検出素子を使用するようにしても良い。Further, in the above embodiment, a semiconductor pressure sensitive element is used as the differential pressure detecting element 10, but a capacitance type differential pressure detecting element may be used.
また、上述した実施例においては、各プロセス配管４ａ
、４ｂ中にある流体の差圧を検出するようにしているが
、低圧側を大気に開放するようにして大気との差圧を検
出するようにしても良い。In addition, in the embodiment described above, each process pipe 4a
, 4b, the pressure difference between the fluid and the atmosphere may be detected by opening the low pressure side to the atmosphere.
また、上述した実施例においては、ニードル式の弁１９
を使用するようにしているが、同様の機能を有する弁、
例えば０−リングシール式の弁などを使用するようにし
ても良い。Further, in the embodiment described above, the needle type valve 19
Valve with similar function,
For example, an O-ring seal type valve may be used.
また、上述した実施例においては、Ｕ字型圧力媒体通路
９の高圧側と、バイパス路１１との接続部分に弁機構１
２を設けるようにしているが、Ｕ字型圧力媒体通路９の
低圧側と、バイパス路１ｉとの接続部分に弁機構１２を
設けるようにしても良い。Further, in the embodiment described above, the valve mechanism 1 is provided at the connection portion between the high pressure side of the U-shaped pressure medium passage 9 and the bypass passage 11.
However, the valve mechanism 12 may be provided at the connection portion between the low pressure side of the U-shaped pressure medium passage 9 and the bypass passage 1i.
また、上述した実施例においては、駆動コイル２３によ
って弁１９を駆動するようにしているが、他の駆動機構
、例えば圧電素子等を使用した駆動機構によって弁１９
を駆動するようにしても良い。Further, in the embodiment described above, the valve 19 is driven by the drive coil 23, but the valve 19 is driven by another drive mechanism, for example, a drive mechanism using a piezoelectric element or the like.
It is also possible to drive the
以上説明したように本発明によれば、差圧伝送器外に設
置しである土岐弁機構を操作しなくても、遠隔地におい
て誤差の少ない零点調整を行なうことができる。As explained above, according to the present invention, zero point adjustment with less error can be performed at a remote location without operating the Toki valve mechanism installed outside the differential pressure transmitter.
第１図は本発明による差圧伝送器の一実施例を示す断面
図、第２図は第１図に示す弁機構の詳細な断面図、第３
図は第１図に示す信号処理回路の詳細なブロック図、第
４図は従来から知られている差圧伝送器の一例を示す断
面図である。
１・・・ブロック部
２・・・受圧フランジ部
５・・・ブロック本体
７・・・隔壁ダイヤフラム
８・・・絞り
９・・
圧力媒体通路
１０・・・差圧検出素子
１−・・
バイパス路
１２・・・弁機構FIG. 1 is a cross-sectional view showing one embodiment of the differential pressure transmitter according to the present invention, FIG. 2 is a detailed cross-sectional view of the valve mechanism shown in FIG. 1, and FIG.
This figure is a detailed block diagram of the signal processing circuit shown in FIG. 1, and FIG. 4 is a sectional view showing an example of a conventionally known differential pressure transmitter. 1... Block part 2... Pressure receiving flange part 5... Block body 7... Partition diaphragm 8... Restriction 9... Pressure medium passage 10... Differential pressure detection element 1-... Bypass path 12... Valve mechanism
Claims (2)
位置に設けられる差圧検出素子と、 前記圧力媒体通路の両端を各々閉じる隔壁ダイヤフラム
と、 前記圧力媒体通路の差圧検出素子の各面側をバイパスす
るバイパス路と、 このバイパス路と前記圧力媒体通路の接続部分に設けら
れ、バイパス路の開通および圧力媒体通路の遮断と、バ
イパス路の遮断および圧力媒体通路の開通とを切り替え
る弁機構と、 を備えたことを特徴とする差圧伝送器。(1) A differential pressure detection element provided at a position that blocks a pressure medium passage formed in the block body, a partition diaphragm that closes both ends of the pressure medium passage, and each surface of the differential pressure detection element of the pressure medium passage. a bypass passage that bypasses the side; and a valve mechanism that is provided at a connecting portion between the bypass passage and the pressure medium passage and switches between opening the bypass passage and blocking the pressure medium passage, and closing the bypass passage and opening the pressure medium passage. A differential pressure transmitter comprising:
記バイパス路との接続部分より隔壁ダイヤフラム側の所
定部分に絞りを形成した請求項１記載の差圧伝送器。(2) The differential pressure transmitter according to claim 1, wherein a restriction is formed in a predetermined portion of the pressure medium passage closer to the partition diaphragm than the connection portion between the pressure medium passage and the bypass passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15865690A JPH0450743A (en) | 1990-06-19 | 1990-06-19 | Differential pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15865690A JPH0450743A (en) | 1990-06-19 | 1990-06-19 | Differential pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0450743A true JPH0450743A (en) | 1992-02-19 |
Family
ID=15676479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15865690A Pending JPH0450743A (en) | 1990-06-19 | 1990-06-19 | Differential pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0450743A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06108990A (en) * | 1992-09-29 | 1994-04-19 | Mitsubishi Electric Corp | Pressure sensor correcting device and air blower control device |
| JPH0643535U (en) * | 1992-11-16 | 1994-06-10 | 山武ハネウエル株式会社 | Differential pressure / pressure transmitter |
| JP2011516858A (en) * | 2008-04-03 | 2011-05-26 | ローズマウント インコーポレイテッド | Industrial pressure sensor with dielectric modified fill fluid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932915U (en) * | 1982-08-26 | 1984-02-29 | ジエコ−株式会社 | Tilt sensor |
| JPS5910036B2 (en) * | 1974-02-14 | 1984-03-06 | 松下電工株式会社 | discharge lamp lighting device |
-
1990
- 1990-06-19 JP JP15865690A patent/JPH0450743A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910036B2 (en) * | 1974-02-14 | 1984-03-06 | 松下電工株式会社 | discharge lamp lighting device |
| JPS5932915U (en) * | 1982-08-26 | 1984-02-29 | ジエコ−株式会社 | Tilt sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06108990A (en) * | 1992-09-29 | 1994-04-19 | Mitsubishi Electric Corp | Pressure sensor correcting device and air blower control device |
| JPH0643535U (en) * | 1992-11-16 | 1994-06-10 | 山武ハネウエル株式会社 | Differential pressure / pressure transmitter |
| JP2011516858A (en) * | 2008-04-03 | 2011-05-26 | ローズマウント インコーポレイテッド | Industrial pressure sensor with dielectric modified fill fluid |
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