JPH0227610B2 - - Google Patents
Info
- Publication number
- JPH0227610B2 JPH0227610B2 JP59153360A JP15336084A JPH0227610B2 JP H0227610 B2 JPH0227610 B2 JP H0227610B2 JP 59153360 A JP59153360 A JP 59153360A JP 15336084 A JP15336084 A JP 15336084A JP H0227610 B2 JPH0227610 B2 JP H0227610B2
- Authority
- JP
- Japan
- Prior art keywords
- measuring device
- flow rate
- thin tube
- main body
- partition member
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、管路軸線方向の２点間の圧力差を利
用してガスの流量を測定するガス流量測定装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gas flow rate measuring device that measures the flow rate of gas using the pressure difference between two points in the axial direction of a pipe.
一般に、層流流量計は管路内を流れる流体の粘
性抵抗による圧力降下を利用した流量測定装置と
して知られている。
Generally, a laminar flow meter is known as a flow rate measuring device that utilizes pressure drop due to viscous resistance of fluid flowing in a pipe.
従来、この種の流量測定装置には、管路の途中
に取付けられた粘性抵抗管としての細管およびこ
の細管の入口と出口の間の圧力差を測定する差圧
検出器を備えたものが採用されている。 Conventionally, this type of flow rate measuring device has been equipped with a thin tube as a viscous resistance tube installed in the middle of the pipeline and a differential pressure detector that measures the pressure difference between the inlet and outlet of this thin tube. has been done.
ところが、従来の流量測定装置においては、層
流が得られる流体すなわち非圧縮性を有する流体
の場合、その流量測定を簡単な比例演算式を用い
て行うことができるが、気体のように圧縮性の影
響を考慮しなければならない流体の流量を測定す
る場合演算補正を必要としていた。また、前記細
管が長くなると両圧力検出部間の間隔が大きくな
り、差圧検出器を測定装置本体側に直接設置する
ことができず、装置全体が大型化するという欠点
があつた。 However, in the case of a fluid that can obtain a laminar flow, that is, a fluid that is incompressible, conventional flow rate measurement devices can measure the flow rate using a simple proportional calculation formula, but if the fluid is compressible like a gas, Calculation correction was required when measuring the flow rate of a fluid, which must take into account the effects of Furthermore, as the thin tube becomes longer, the distance between the two pressure detecting sections increases, making it impossible to directly install the differential pressure detector on the main body of the measuring device, resulting in an increase in the size of the entire device.
本発明はこのような事情に鑑みなされたもの
で、筒状の測定装置本体内を仕切部材によつて画
成された２室内にそれぞれ開口する圧力取出用孔
を測定装置本体壁に設け、コイル状に形成した細
管を一方の室に収納すると共に、この細管の一端
部を仕切部材を貫通させ他方の室内に開口させる
というきわめて簡単な構成により、差圧検出器を
用いたガスの流量測定を補正演算することなく行
うことができるだけでなく、装置全体の小型化を
計ることができるガス流量測定装置を提供するも
のである。以下、その構成等を図に示す実施例に
よつて詳細に説明する。
The present invention has been made in view of the above circumstances, and includes pressure extraction holes that open into two chambers defined by a partition member in the cylindrical measuring device main body, and are provided in the wall of the measuring device main body. With an extremely simple configuration in which a thin tube formed in the shape of a shape is housed in one chamber, and one end of this thin tube is passed through a partition member and opened into the other chamber, it is possible to measure the gas flow rate using a differential pressure detector. It is an object of the present invention to provide a gas flow rate measuring device that can not only perform the measurement without performing correction calculations, but can also reduce the size of the entire device. Hereinafter, the configuration and the like will be explained in detail by referring to embodiments shown in the drawings.
第１図は本発明に係るガス流量測定装置を示す
断面図、第２図は同じくガス流量測定装置の使用
状態を示す一部断面図である。同図において、符
号１で示すものは筒状の測定装置本体で、両開口
端付近にそれぞれねじ部２ａ，２ｂが設けられた
内孔２を有し通しボルト３によつて接続用配管４
間に挾持されている。この測定装置本体１は入口
側の開口端に接続用フランジ５が設けられてお
り、出口側の開口端には通孔６を有する接続フラ
ンジ７がボルト８によつてガスケツト９を介し取
付けられている。１０は前記内孔２を入口側室１
１、出口側室１２の２室に画成する仕切部材とし
ての細管取付ベースで、孔１３ａ，１３ｂを有し
前記ねじ部２ａに螺合した筒状の押さえ部材１３
により前記内孔２の段部２ｃにパツキン１４を介
して固定されている。この細管取付ベース１０の
出口側中央には前記押さえ部材１３内に位置し孔
１５ａを有する筒状のプロテクト１５が設けられ
ている。１６および１７はそれぞれ前記入口側室
１１、出口側室１２内に開口する圧力取出用孔
で、前記測定装置本体１の壁１ａに設けられてい
る。１８は前記入口側室１１および前記出口側室
１２に各々開口するコイル状の細管で、前記細管
取付ベース１０に半田付けにより固定され、かつ
前記測定装置本体１（プロテクト１５）内に前記
細管取付ベース１０を介して着脱自在に収納され
ている。そして、この細管１８は、一端部が前記
細管取付ベース１０に対向する部位に当接し、他
端部が前記細管取付ベース１０に挿通されてお
り、全体が内径0.58mm、長さ2000mmおよび巻径16
mmの各寸法に設定されたステンレス等の材料によ
つて形成されている。１９は前記入口側室１１内
に開口する孔１９ａを有する筒状の案内管で、一
端部が前記細管１８の内側に臨み他端部が前記ね
じ部２ｂに螺合されている。２０は圧力センサ
（図示せず）を内蔵する差圧検出器で、高圧側ダ
イヤフラム２１および低圧側ダイヤフラム２２を
有し前記測定装置本体１上に設置されている。そ
して、この差圧検出器２０は両ダイヤフラム２
１，２２に各測定圧力を与え、これら圧力による
圧力伝達液２３の移動を前記圧力センサにより電
気的出力として取り出すように構成されている。
また、２４および２５はそれぞれ前記測定装置本
体１に取付けられ入口側室１１、出口側室１２内
のドレンを抜くためのドレン抜きである。
FIG. 1 is a sectional view showing a gas flow rate measuring device according to the present invention, and FIG. 2 is a partially sectional view showing the state in which the gas flow rate measuring device is used. In the figure, the reference numeral 1 indicates a cylindrical measuring device main body, which has an inner hole 2 with threaded portions 2a and 2b near both open ends, and a connecting pipe 4 with a through bolt 3.
is held in between. This measuring device main body 1 is provided with a connecting flange 5 at the open end on the inlet side, and a connecting flange 7 having a through hole 6 is attached to the open end on the outlet side with bolts 8 through a gasket 9. There is. 10 connects the inner hole 2 to the entrance side chamber 1
1. A cylindrical holding member 13 having holes 13a and 13b and screwed into the threaded portion 2a, which is a thin tube mounting base serving as a partition member defining two chambers of the outlet side chamber 12.
It is fixed to the stepped portion 2c of the inner hole 2 via a packing 14. A cylindrical protector 15 is provided at the center of the outlet side of the capillary attachment base 10, located inside the holding member 13 and having a hole 15a. Reference numerals 16 and 17 are pressure extraction holes opening into the inlet side chamber 11 and the outlet side chamber 12, respectively, and are provided in the wall 1a of the measuring device main body 1. Reference numeral 18 denotes a coiled thin tube that opens into the inlet side chamber 11 and the outlet side chamber 12, and is fixed to the thin tube mounting base 10 by soldering, and the thin tube mounting base 10 is fixed in the measuring device main body 1 (protector 15). It is removably stored through the . The thin tube 18 has one end in contact with a portion facing the thin tube mounting base 10, and the other end inserted into the thin tube mounting base 10, and has an inner diameter of 0.58 mm, a length of 2000 mm, and a winding diameter. 16
It is made of a material such as stainless steel with dimensions set in mm. Reference numeral 19 denotes a cylindrical guide tube having a hole 19a opening into the inlet side chamber 11, one end facing inside the thin tube 18 and the other end screwed into the threaded portion 2b. Reference numeral 20 denotes a differential pressure detector incorporating a pressure sensor (not shown), which has a high-pressure side diaphragm 21 and a low-pressure side diaphragm 22, and is installed on the measuring device main body 1. This differential pressure detector 20 has both diaphragms 2
1 and 22, and the movement of the pressure transmitting liquid 23 due to these pressures is extracted as an electrical output by the pressure sensor.
Further, 24 and 25 are drain drains attached to the measuring device body 1, respectively, for draining the drain from the inlet side chamber 11 and the outlet side chamber 12.
このように構成されたガス流量測定装置におい
ては、測定装置本体１の入口側から導入される被
測定ガスが案内管１９、入口側室１１内を経て細
管１８の一端より管内に入る。そして、細くかつ
長い管内で被測定ガスは層流ないしはこれに近い
流れとなつて細管１８の他端に到り、プロテクト
１５内すなわち測定装置本体１の出口側室１２に
噴出される。このとき、、圧力取出用孔１６およ
び１７からそれぞれ圧力P1，P2が取り出され、
高圧側ダイヤフラム２１、低圧側ダイヤフラム２
２に印加される。ここで、圧力P1，P2には、細
管１８内の流過による被測定ガスの粘性抵抗によ
つて圧力差が生じている。そして、各ダイヤフラ
ム２１，２２が凹んで生じる圧力伝達液２３の移
動量の差を圧力センサが検出してこれを電気信号
として発信することにより圧力差が測定され、被
測定ガスの流量を求めることができる。この場
合、圧力差P1−P2を各流量毎にプロツトしてみ
ると、層流流量計を使用した場合ときわめて近似
したリニヤリテイにすぐれた特性が得られ、しか
もその再現性について良好な成果が得られる。ま
た、本実施例においては、両圧力取出用孔１６，
１７を測定装置本体壁１ａに設けたから、細管１
８の長さに関わりなく測定装置本体１に差圧検出
器２０を直接設置することができる。さらに、本
実施例においては、細管１８を測定装置本体１内
に細管取付ベース１０を介して着脱自在に収納し
たので、被測定流体の流れによる差圧発生部分が
細管１８だけであることから、装置修理に際して
は細管１８を細管取付ベース１０ごと取り外して
交換するだけでよい。 In the gas flow rate measuring device configured in this manner, the gas to be measured is introduced from the inlet side of the measuring device main body 1, passes through the guide tube 19 and the inlet side chamber 11, and enters the tube from one end of the thin tube 18. The gas to be measured becomes a laminar flow or a laminar flow in the long and thin tube, reaches the other end of the thin tube 18, and is ejected into the protector 15, that is, into the outlet side chamber 12 of the measuring device main body 1. At this time, pressures P 1 and P 2 are taken out from the pressure extraction holes 16 and 17, respectively,
High pressure side diaphragm 21, low pressure side diaphragm 2
2. Here, a pressure difference occurs between the pressures P 1 and P 2 due to the viscous resistance of the gas to be measured due to the flow inside the thin tube 18 . Then, the pressure sensor detects the difference in the amount of movement of the pressure transmission liquid 23 caused by the depression of each diaphragm 21 and 22, and transmits this as an electric signal, thereby measuring the pressure difference and determining the flow rate of the gas to be measured. Can be done. In this case, when the pressure difference P 1 - P 2 is plotted for each flow rate, it is possible to obtain characteristics with excellent linearity that are very similar to those obtained when using a laminar flow meter, and also have good results in terms of reproducibility. is obtained. In addition, in this embodiment, both pressure extraction holes 16,
17 was provided on the wall 1a of the main body of the measuring device, the thin tube 1
The differential pressure detector 20 can be directly installed on the measuring device main body 1 regardless of the length of the measuring device 8. Furthermore, in this embodiment, since the thin tube 18 is removably housed in the measuring device main body 1 via the thin tube mounting base 10, the thin tube 18 is the only part where differential pressure is generated due to the flow of the fluid to be measured. When repairing the device, it is sufficient to simply remove the capillary tube 18 along with the capillary attachment base 10 and replace it.
なお、本発明においては、第３図ａに示すよう
に小径の内孔２６ａ有する案内管２６およびライ
ナ２７を使用し、また同図ｂに示すように発泡ス
チロール材あるいは樹脂モールド材からなるスペ
ーサ２８を使用して入口側室１１内の容積を小さ
くし、流量測定時の応答遅れを改善することがで
きる。 In the present invention, as shown in FIG. 3a, a guide tube 26 and a liner 27 having a small diameter inner hole 26a are used, and as shown in FIG. By using this, it is possible to reduce the volume inside the inlet side chamber 11 and improve the response delay when measuring the flow rate.
以上説明したように本発明によれば、測定装置
本体内を仕切部材によつて２室に画成し、コイル
状に形成した細管を一方の室に収納すると共に、
この細管の一端部を仕切部材を貫通させ他方の室
内に開口させたので、細管内を流れる被測定ガス
が管壁によるウンダリ効果によつて層流となり、
両圧力取出用孔から取り出す被測定ガスの圧力差
が流量に比例することになつて差圧検出器を使用
した流量測定をきわめて簡単な演算式により行う
ことができる。また、両圧力取出用孔を測定装置
本体壁に設けたので、細管の長さに関わりなく差
圧検出器を測定装置本体に直接設置することがで
き、装置全体の小型化を計ることができる。しか
も、従来必要とした差圧検出器と測定装置本体と
を結合するための配管作業が不要になる。さら
に、細管を仕切部材に固定してこの仕切部材を測
定装置本体内に着脱自在に設けたので、被測定流
体の流れによる差圧発生部分が細管だけであるこ
とから、装置修理に際しては、細管を仕切部材ご
と取り外して交換するだけでよく、現場での特別
なキヤリブレートは不要になり、その修理作業を
きわめて容易に行うことができる。また、被測定
流体に応じて細管の径や長さを自由に変更できる
といつた利点もある。
As explained above, according to the present invention, the inside of the measuring device main body is divided into two chambers by the partition member, and a thin tube formed in a coil shape is stored in one chamber, and
One end of this thin tube was passed through the partition member and opened into the other chamber, so the gas to be measured flowing inside the thin tube became a laminar flow due to the unevenness effect of the tube wall.
Since the pressure difference between the gases to be measured taken out from both pressure extraction holes is proportional to the flow rate, the flow rate measurement using the differential pressure detector can be performed using an extremely simple calculation formula. In addition, since both pressure extraction holes are provided on the wall of the measuring device, the differential pressure detector can be installed directly on the measuring device regardless of the length of the tube, making it possible to downsize the entire device. . Furthermore, piping work for connecting the differential pressure detector and the main body of the measuring device, which was conventionally required, is no longer necessary. Furthermore, since the thin tube is fixed to the partition member and this partition member is removably installed inside the measuring device body, the thin tube is the only part that generates a pressure difference due to the flow of the fluid to be measured. It is only necessary to remove and replace the entire partition member, eliminating the need for a special calibrator on-site, making repair work extremely easy. Another advantage is that the diameter and length of the tube can be changed freely depending on the fluid to be measured.
第１図は本発明に係るガス流量測定装置を示す
断面図、第２図は同じくガス流量測定装置の使用
状態を示す一部断面図、第３図ａおよびｂは同じ
くガス流量測定装置の応用例を示す断面図であ
る。
１……測定装置本体、１ａ……測定装置本体
壁、１０……細管取付ベース、１１……入口側
室、１２……出口側室、１６，１７……圧力取出
用孔、１８……細管。
FIG. 1 is a cross-sectional view showing a gas flow rate measuring device according to the present invention, FIG. 2 is a partial cross-sectional view showing how the gas flow rate measuring device is used, and FIGS. 3 a and b are applications of the gas flow rate measuring device. It is a sectional view showing an example. DESCRIPTION OF SYMBOLS 1... Measuring device main body, 1a... Measuring device main body wall, 10... Thin tube mounting base, 11... Inlet side chamber, 12... Outlet side chamber, 16, 17... Pressure extraction hole, 18... Thin tube.
Claims (1)
ら各室の内外に開口する圧力取出用孔を有する筒
状の測定装置本体と、この測定装置本体内に前記
仕切部材を介して着脱自在に収納され前記両室内
に各々開口するコイル状の細管とを備え、この細
管の一端部を前記仕切部材に挿通固定し、他端部
を前記仕切部材に対向する部位に当接させたこと
特徴とするガス流量測定装置。 ２ 両圧力取出用孔は差圧検出手段を設置可能に
する位置に位置付けられている特許請求の範囲第
１項記載のガス流量測定装置。[Scope of Claims] 1. A cylindrical measuring device main body having two chambers defined by a partition member and a pressure extraction hole opening inside and outside each of these chambers, and the partition member inside the measuring device main body. coil-shaped thin tubes that are removably stored in the chambers and open into the two chambers, one end of the thin tube is inserted through and fixed to the partition member, and the other end is in contact with a portion facing the partition member. A gas flow rate measuring device characterized by the fact that it is connected to the gas flow rate. 2. The gas flow rate measuring device according to claim 1, wherein both pressure extraction holes are located at a position where a differential pressure detection means can be installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15336084A JPS6130716A (en) | 1984-07-24 | 1984-07-24 | Apparatus for measuring flow amount of gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15336084A JPS6130716A (en) | 1984-07-24 | 1984-07-24 | Apparatus for measuring flow amount of gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6130716A JPS6130716A (en) | 1986-02-13 |
| JPH0227610B2 true JPH0227610B2 (en) | 1990-06-19 |
Family
ID=15560750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15336084A Granted JPS6130716A (en) | 1984-07-24 | 1984-07-24 | Apparatus for measuring flow amount of gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6130716A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07119636B2 (en) * | 1987-08-26 | 1995-12-20 | 株式会社日立製作所 | Flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6326732Y2 (en) * | 1981-02-26 | 1988-07-20 |
-
1984
- 1984-07-24 JP JP15336084A patent/JPS6130716A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6130716A (en) | 1986-02-13 |
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