JPH08278180A - Powder flow rate measuring device - Google Patents
Powder flow rate measuring deviceInfo
- Publication number
- JPH08278180A JPH08278180A JP7079005A JP7900595A JPH08278180A JP H08278180 A JPH08278180 A JP H08278180A JP 7079005 A JP7079005 A JP 7079005A JP 7900595 A JP7900595 A JP 7900595A JP H08278180 A JPH08278180 A JP H08278180A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- powder flow
- amplifier
- shield
- measuring device
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 40
- 238000005259 measurement Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、塗料などの粉体の流
量を静電容量の変化をパラメータとして測定する粉体流
量測定装置に関し、特に、粉体の通路に沿って、シール
ドされた一対の測定用電極を対向させて配置し、この測
定用電極に電源電圧を印加して、この測定用電極間に流
れる電流の変化をシールドされたケーブルおよび増幅器
を介して取り出す粉体流量測定装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder flow rate measuring device for measuring the flow rate of powder such as paint using a change in electrostatic capacitance as a parameter, and in particular, a pair of shields along a powder path. Of the powder flow rate measuring device in which the measuring electrodes are arranged to face each other, a power supply voltage is applied to the measuring electrodes, and changes in the current flowing between the measuring electrodes are taken out through a shielded cable and an amplifier. It is a thing.
【０００２】[0002]
【従来の技術】従来、この種の装置においては、測定対
象である粉体の中を通らない電気力線による漂遊容量を
避けるために、測定用電極やケーブルがシールドされて
いる（いわゆる、ガード・シールド技法）が、この測定
用電極やケーブルとシールドの間には、ある静電容量が
存在して、電流の流れることがあった。2. Description of the Related Art Conventionally, in this type of device, in order to avoid stray capacitance due to lines of electric force that do not pass through the powder to be measured, the measuring electrodes and cables are shielded (so-called guards). -Shielding technology), but there was a certain capacitance between the measuring electrode or cable and the shield, and current sometimes flowed.
【０００３】したがって、電源電圧をそれぞれのシール
ドに印加し、測定用電極やケーブルとの間の電位差をな
くし、測定用電極やケーブルとシールドとの間に電流が
流れないようにして測定値の誤差をなくすものが既に知
られている（実公平４−２１１０３号公報参照。）。Therefore, the power supply voltage is applied to each shield to eliminate the potential difference between the measuring electrode and the cable, and the current is prevented from flowing between the measuring electrode and the cable and the error in the measured value. It is already known to eliminate this (see Japanese Utility Model Publication No. 4-21103).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな粉体流量測定装置においても、測定用電極を固定す
る粉体の通路を構成する部材やケーブルは、周辺の温、
湿度の変化により、その表面状態や長さを微妙に変化さ
せ、測定用電極やケーブルとシールドの間および測定用
電極とガード電極の間のインピーダンスを不規則に変化
させ、加えて、通路を構成する部材は、表面の汚れの状
態によってもガード電極やシールドとの間のインピーダ
ンスに変化をもたらすので、静電容量の測定に当たって
は、これらの変化の影響を受けないようにしなければな
らなかった。特に、粉体を流さない時の静電容量の値Ｃ
kに比し、粉体の流量の変動による静電容量の変化量Ｃx
は、Ｃkの数値に対して１／１０〜１／１００程度のオ
ーダ（例えば、Ｃxの数値は１ｐＦ以下と小さい。）で
あり、実際に、粉体の流量の変動に伴う静電容量の変化
量を測定するためには、測定用電極やガード電極および
ケーブルに対する完全なシールドが要求されていた。However, even in such a powder flow rate measuring device, the members and cables constituting the powder passage for fixing the measuring electrodes are not affected by the ambient temperature,
Due to changes in humidity, the surface condition and length are subtly changed, and the impedance between the measurement electrode or cable and the shield and between the measurement electrode and the guard electrode are changed irregularly, and in addition, the passage is configured. The member to be used causes a change in impedance between the guard electrode and the shield depending on the state of dirt on the surface. Therefore, it is necessary to avoid the influence of these changes in measuring the capacitance. In particular, the capacitance value C when the powder does not flow
Compared to k , the change amount C x of the capacitance due to the change of the powder flow rate
Is on the order of 1/10 to 1/100 of the numerical value of C k (for example, the numerical value of C x is as small as 1 pF or less), and actually, the capacitance associated with the fluctuation of the flow rate of the powder. In order to measure the amount of change in, it was necessary to completely shield the measuring electrode, the guard electrode and the cable.
【０００５】この発明は、従来のこのような要求を満た
すためになされたもので、周辺の温、湿度の変化によっ
て影響を受けず、粉体流量を正確に測定することができ
る粉体流量測定装置を提供することを目的としている。The present invention has been made in order to meet such a conventional requirement, and is capable of accurately measuring the powder flow rate without being affected by changes in ambient temperature and humidity. The purpose is to provide a device.
【０００６】上記目的を達成するために、この発明は、
粉体の通路に沿って、シールドされた一対の測定用電極
を対向させて配置し、この測定用電極に電源電圧を印加
して、この測定用電極間に流れる電流の変化をシールド
されたケーブルおよび増幅器を介して取り出す粉体流量
測定装置において、前記増幅器の出力電圧を測定用電極
のシールドおよびケーブルのシールドに接続したもので
ある。また、増幅器の出力は通常の測定装置のスイッチ
ング回路に接続されているものである。In order to achieve the above object, the present invention provides
A shielded cable that has a pair of shielded measurement electrodes facing each other along a powder passage, and a power supply voltage is applied to the measurement electrodes to shield the change in current flowing between the measurement electrodes. And a powder flow rate measuring device taken out through an amplifier, wherein the output voltage of the amplifier is connected to the shield of the measuring electrode and the shield of the cable. Also, the output of the amplifier is connected to the switching circuit of a conventional measuring device.
【０００７】[0007]
【作用】増幅器の出力は、その増幅率を大きくすればす
る程、測定用電極とガード電極やシールド間のインピー
ダンスの変動の影響を無視できることが判明した。It has been found that the larger the amplification factor of the output of the amplifier, the more negligible the influence of the impedance variation between the measuring electrode, the guard electrode and the shield.
【０００８】[0008]
【実施例】この発明の実施例の説明を容易にするため
に、先に、従来の粉体流量測定装置について説明する。
なお、図中、同一または相当部分には、同一の符号が付
されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate the description of the embodiments of the present invention, a conventional powder flow rate measuring device will be described first.
Note that, in the drawings, the same or corresponding parts are denoted by the same reference numerals.
【０００９】図３において、１は粉体流量測定装置であ
り、粉体の通路２を構成する石英ガラス管３、電源４、
この電源４に接続されて電源電圧を印加されている測定
用電極、すなわち、ソース電極５ａおよび５ｂ、ガード
電極６、測定用電極５ａおよび５ｂを遮蔽するシールド
７、出力側へ接続するケーブル８、このケーブル８のシ
ールド９、増幅器１０および電流Ｉ0を測定するための
測定用インピーダンス１１からなっている。In FIG. 3, reference numeral 1 denotes a powder flow rate measuring device, which comprises a quartz glass tube 3 constituting a powder passage 2, a power source 4,
A measurement electrode connected to the power source 4 and applied with a power supply voltage, that is, a source electrode 5a and 5b, a guard electrode 6, a shield 7 that shields the measurement electrodes 5a and 5b, a cable 8 connected to the output side, The cable 8 includes a shield 9, an amplifier 10, and a measurement impedance 11 for measuring the current I 0 .
【００１０】各シールド７および９には、ガード電極
６、接続線１２および１３を介してそれぞれ電源電圧が
印加されているので、電源４の出力インピーダンスや電
流計１１の内部インピーダンスが充分小さい場合には、
測定用電極５ａおよび５ｂとシールド７間、およびケー
ブル８とそのシールド９間にはその容量を通って電流の
流れることはない。また、増幅器１０は、図示しないブ
リッジ型などの測定器へ切り替えるためのスイッチング
回路に接続され、測定器において静電容量をパラメータ
とする粉体流量が測定される。A power supply voltage is applied to each of the shields 7 and 9 via the guard electrode 6 and the connecting wires 12 and 13, so that when the output impedance of the power supply 4 and the internal impedance of the ammeter 11 are sufficiently small. Is
No current flows between the measuring electrodes 5a and 5b and the shield 7 and between the cable 8 and the shield 9 through the capacitances thereof. Further, the amplifier 10 is connected to a switching circuit for switching to a bridge-type measuring instrument (not shown), and the powder flow rate using the capacitance as a parameter is measured in the measuring instrument.
【００１１】図４は図３の粉体流量測定装置の等価回路
を示し、Ｅは電源電圧、Ｚ1は測定用電極であるソース
電極５ａとガード電極６間のインピーダンス、Ｚ2はガ
ード電極６と測定用電極であるセンス電極５ｂ間のイン
ピーダンス、Ｚ3はソース電極５ａとシールド７間のイ
ンピーダンス、Ｚ4はセンス電極５ｂとシールド７間の
インピーダンス、Ｚ5はケーブル８とそのシールド９間
のインピーダンス、Ｚ0は測定用インピーダンス、Ｃxは
ソース電極５ａとセンス電極５ｂ間の被測定容量、Ｉx
は被測定容量を流れる電流、Ｖ1は増幅器１０の＋入力
電圧、Ｖ2は増幅器１０の−入力電圧、Ａは増幅器１０
の増幅率（Ｖ0＝（Ｖ1−Ｖ2）Ａ）、Ｖ0は増幅器１０の
出力、そして、Ｚ245はＺ2とＺ4とＺ5のパラレル接続イ
ンピーダンスである。FIG. 4 shows an equivalent circuit of the powder flow rate measuring device of FIG. 3, where E is the power supply voltage, Z 1 is the impedance between the source electrode 5a and the guard electrode 6 which are measuring electrodes, and Z 2 is the guard electrode 6. the impedance between the sense electrodes 5b is a measuring electrode, Z 3 is the impedance between the source electrode 5a and the shield 7, the impedance between Z 4 is a sense electrode 5b and the shield 7, Z 5 is between the cable 8 and its shield 9 Impedance, Z 0 is a measurement impedance, C x is a measured capacitance between the source electrode 5a and the sense electrode 5b, I x
Is a current flowing through the capacitance to be measured, V 1 is a + input voltage of the amplifier 10, V 2 is a − input voltage of the amplifier 10, and A is an amplifier 10.
(V 0 = (V 1 −V 2 ) A), V 0 is the output of the amplifier 10, and Z 245 is the parallel connection impedance of Z 2 , Z 4 and Z 5 .
【００１２】次に、この発明の実施例である粉体流量測
定装置１を図１の概略図および図２の等価回路について
説明するが、既に図３および図４の従来の粉体流量測定
装置１について説明した部分関しては、その説明を省略
する。図１において、各シールド７および９は、接続線
１５および１６によって増幅器１０の出力点１７に接続
され、増幅器１０の出力電圧Ｖ'0が印加されている。
Ｖ'1は増幅器１０の＋入力電圧、Ｖ'2は増幅器１０の−
入力電圧、そして、Ｖ'0は増幅器１０の出力電圧であ
る。Next, a powder flow rate measuring apparatus 1 according to an embodiment of the present invention will be described with reference to the schematic diagram of FIG. 1 and the equivalent circuit of FIG. 2. The conventional powder flow rate measuring apparatus of FIGS. The description of the part described in No. 1 will be omitted. In FIG. 1, each shield 7 and 9 is connected to an output point 17 of the amplifier 10 by connecting lines 15 and 16, and an output voltage V ′ 0 of the amplifier 10 is applied.
V ′ 1 is the + input voltage of the amplifier 10, and V ′ 2 is the −input voltage of the amplifier 10.
The input voltage, and V ′ 0, is the output voltage of the amplifier 10.
【００１３】今、図３に示される従来の粉体流量測定装
置１の接続の場合、増幅器１０の出力Ｖ0は、Ｖ0＝（Ｖ
1−Ｖ2）Ａ であり、Ｖ0＝Ｖ2 であるから、 Ｖ0＝（Ｖ1−Ｖ0）Ａ （１） Ｖ1＝（Ｉx−Ｉr）Ｚ0 （２） Ｉr＝Ｖ1／Ｚ245 （３） これらの式（１）、（２）および（３）より次式（４）
が得られる。Now, in the case of connection of the conventional powder flow rate measuring device 1 shown in FIG. 3, the output V 0 of the amplifier 10 is V 0 = (V
1− V 2 ) A and V 0 = V 2 , so V 0 = (V 1 −V 0 ) A (1) V 1 = (I x −I r ) Z 0 (2) I r = V 1 / Z 245 (3) From these formulas (1), (2) and (3), the following formula (4)
Is obtained.
【００１４】[0014]
【数１】 [Equation 1]
【００１５】図１に示されるこの発明の粉体流量測定装
置１の接続の場合、増幅器１０の出力Ｖ’0は、Ｖ'0＝
（Ｖ'1−Ｖ'2）Ａ であり、Ｖ'0＝Ｖ'2あるから、 Ｖ'0＝（Ｖ'1−Ｖ'0）Ａ （５） Ｖ'1＝（Ｉｘ−Ｉ'r）Ｚ0 （６） Ｉ'r＝（Ｖ'1−Ｖ'2）／Ｚ245 （７） これらの式（５）、（６）および（７）より次式（８）
が得られる。[0015] When the connection of the powder flow rate measuring apparatus 1 of the present invention shown in FIG. 1, the output V of the amplifier 10 '0, V' 0 =
Since (V ′ 1 −V ′ 2 ) A and V ′ 0 = V ′ 2 , V ′ 0 = (V ′ 1 −V ′ 0 ) A (5) V ′ 1 = (I x −I ′ r ) Z 0 (6) I ′ r = (V ′ 1 −V ′ 2 ) / Z 245 (7) From these equations (5), (6) and (7), the following equation (8)
Is obtained.
【００１６】[0016]
【数２】 [Equation 2]
【００１７】通常、増幅器１０の増幅率Ａは、１０００
０〜１０００００倍であるから、（４）式および（８）
式の（１＋Ａ）／Ａを１とすると、従来の粉体流量測定
装置１の出力は次の（４’）式となり、この発明の実施
例の粉体流量測定装置１の出力は次の（８’）式とな
る。Usually, the amplification factor A of the amplifier 10 is 1000
Since it is 0 to 100,000 times, formula (4) and formula (8)
When the expression (1 + A) / A is 1, the output of the conventional powder flow rate measuring device 1 becomes the following formula (4 ′), and the output of the powder flow rate measuring device 1 of the embodiment of the present invention is 8 ') becomes a formula.
【００１８】[0018]
【数３】 (Equation 3)
【００１９】[0019]
【数４】 [Equation 4]
【００２０】（８’）式において、Ａが非常に大きいと
すれば、分母の第２項を殆ど無視することができる。し
たがって、この発明の実施例の場合には、粉体の通路を
構成する部材やシールドに対する、周辺の温度や湿度の
影響を殆ど無視して、正確に静電容量の変化を測定する
ことができ、したがって、粉体流量の変動を正確に測定
することができる。In the equation (8 '), if A is very large, the second term of the denominator can be almost ignored. Therefore, in the case of the embodiment of the present invention, it is possible to accurately measure the change in capacitance, ignoring the influence of the ambient temperature and humidity on the members and the shield forming the powder passage. Therefore, it is possible to accurately measure the fluctuation of the powder flow rate.
【００２１】[0021]
【発明の効果】この発明によれば、周辺の温度や湿度の
影響を受けずに静電容量の変化を正確に測定することが
できるので、粉体流量の変動を正確に測定することがで
きる粉体流量測定装置を得ることができる。According to the present invention, since the change in capacitance can be accurately measured without being affected by the ambient temperature and humidity, it is possible to accurately measure the fluctuation of the powder flow rate. A powder flow rate measuring device can be obtained.
【図１】図１はこの発明の実施例を示す粉体流量測定装
置の概略図である。FIG. 1 is a schematic diagram of a powder flow rate measuring apparatus showing an embodiment of the present invention.
【図２】図２は図１の装置の等価回路を示す図である。FIG. 2 is a diagram showing an equivalent circuit of the device of FIG.
【図３】図３は従来の粉体流量測定装置の概略図であ
る。FIG. 3 is a schematic view of a conventional powder flow rate measuring device.
【図４】図４は図３の装置の等価回路を示す図である。FIG. 4 is a diagram showing an equivalent circuit of the device of FIG.
１ 粉体流量測定装置 ２ 粉体の通路 ３ 通路を構成する部材 ４ 電源 ５ａ，５ｂ 測定用電極 ６ ガード電極 ７，９ シールド ８ ケーブル １０ 増幅器 １１ 測定用インピーダンス １２，１３，１５，１６ 接続線 1 powder flow rate measuring device 2 powder passage 3 members constituting passage 4 power supply 5a, 5b measurement electrode 6 guard electrode 7, 9 shield 8 cable 10 amplifier 11 measurement impedance 12, 13, 15, 16 connection line
Claims (2)
対の測定用電極を対向させて配置し、この測定用電極に
電源電圧を印加して、この測定用電極間に流れる電流の
変化をシールドされたケーブルおよび増幅器を介して取
り出す粉体流量測定装置において、前記増幅器の出力電
圧を測定用電極のシールドおよびケーブルのシールドに
接続したことを特徴とする粉体流量測定装置。1. A pair of shielded measuring electrodes are arranged to face each other along a powder passage, and a power supply voltage is applied to the measuring electrodes to change a current flowing between the measuring electrodes. In a powder flow rate measuring device for taking out via a shielded cable and an amplifier, an output voltage of the amplifier is connected to a shield of a measuring electrode and a shield of a cable.
れていることを特徴とする請求項１記載の粉体流量測定
装置。2. The powder flow rate measuring device according to claim 1, wherein the amplifier is connected to a switching circuit.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07900595A JP3500223B2 (en) | 1995-04-04 | 1995-04-04 | Powder flow measuring device |
| KR1019960706893A KR100232397B1 (en) | 1994-06-03 | 1995-06-01 | Flowmeter |
| PCT/JP1996/000785 WO1996030725A1 (en) | 1995-03-30 | 1996-03-26 | Device for measuring flow rate of powder, method and device for supplying powder |
| US08/737,270 US5929343A (en) | 1995-03-30 | 1996-03-26 | Device for measuring powder flow rate and apparatus and method for supplying powder |
| EP96906953A EP0763719A4 (en) | 1995-03-30 | 1996-03-26 | Device for measuring flow rate of powder, method and device for supplying powder |
| KR1019960706485A KR970703522A (en) | 1995-03-30 | 1996-11-15 | DEVICE FOR MEASURING POWDER FLOW RATE AND APPARATUS AND METHOD FOR SUPPLYING POWDER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07900595A JP3500223B2 (en) | 1995-04-04 | 1995-04-04 | Powder flow measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08278180A true JPH08278180A (en) | 1996-10-22 |
| JP3500223B2 JP3500223B2 (en) | 2004-02-23 |
Family
ID=13677843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07900595A Expired - Lifetime JP3500223B2 (en) | 1994-06-03 | 1995-04-04 | Powder flow measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3500223B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004219372A (en) * | 2003-01-17 | 2004-08-05 | Yokogawa Electric Corp | Electromagnetic flowmeter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855716A (en) * | 1981-09-29 | 1983-04-02 | Sankyo Dengiyou Kk | Electrostatic capacity type detector for hold up |
| JPS6276440A (en) * | 1985-09-30 | 1987-04-08 | Kubota Ltd | Detector for flow of powdery particles |
| JPS63142219A (en) * | 1986-11-25 | 1988-06-14 | ポンプテック、ナームローゼ、ベノートスハップ | Flowmeter |
-
1995
- 1995-04-04 JP JP07900595A patent/JP3500223B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855716A (en) * | 1981-09-29 | 1983-04-02 | Sankyo Dengiyou Kk | Electrostatic capacity type detector for hold up |
| JPS6276440A (en) * | 1985-09-30 | 1987-04-08 | Kubota Ltd | Detector for flow of powdery particles |
| JPS63142219A (en) * | 1986-11-25 | 1988-06-14 | ポンプテック、ナームローゼ、ベノートスハップ | Flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004219372A (en) * | 2003-01-17 | 2004-08-05 | Yokogawa Electric Corp | Electromagnetic flowmeter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3500223B2 (en) | 2004-02-23 |
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