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DE19612141A1 - Measuring probe for air concentration in electrostatic powder coating in paint shop - Google Patents

Measuring probe for air concentration in electrostatic powder coating in paint shop

Info

Publication number
DE19612141A1
DE19612141A1 DE1996112141 DE19612141A DE19612141A1 DE 19612141 A1 DE19612141 A1 DE 19612141A1 DE 1996112141 DE1996112141 DE 1996112141 DE 19612141 A DE19612141 A DE 19612141A DE 19612141 A1 DE19612141 A1 DE 19612141A1
Authority
DE
Germany
Prior art keywords
electrode
measuring probe
measuring
probe
powder coating
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.)
Ceased
Application number
DE1996112141
Other languages
German (de)
Inventor
Lothar Friedrich
Michael Ing Grad Kiesl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE1996112141 priority Critical patent/DE19612141A1/en
Publication of DE19612141A1 publication Critical patent/DE19612141A1/en
Ceased legal-status Critical Current

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
    • G01F1/56—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 electric or magnetic effects
    • 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
    • G01F1/56—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 electric or magnetic effects
    • G01F1/64—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 electric or magnetic effects by measuring electrical currents passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The measuring probe has an electrode (3) which neutralises the probe entry charge across a low ohmic resistance (6). An electrode (5) electrically determines the static charge in the measurement stretch, compared to the electrode (4) as a signal. The electrode (4) is connected to an earth (8) across a high ohmic resistance (7). The electrode (4) prevents a voltage flashover, by using a selected current limitation.

Description

Die Meßsonde ermöglicht die elektrische Erfassung von Durchflußmengen bei der elektrostatischen Pulverbeschich­ tung.The measuring probe enables the electrical detection of Flow rates in electrostatic powder coating tung.

Vergleichbare Verfahren lösen diese Aufgabe elektrisch durch Messung der Reibungselektrizität, jedoch mit ver­ schiedenen gravierenden Nachteilen durch räumliche Tren­ nung der Meßelektrode vom Mediumfluß.Comparable processes solve this task electrically by measuring the frictional electricity, but with ver various serious disadvantages due to spatial doors voltage of the measuring electrode from the medium flow.

Die Erfindung löst die Aufgabe durch zwei oder mehrere Elektroden mit elektrisch und räumlich speziellen Anord­ nungen.The invention solves the problem by two or more Electrodes with special electrical and spatial arrangement mentions.

ArbeitsweiseWay of working

Der Pulvertransport-Schlauch einer Lackieranlage wird auf­ getrennt und auf die Sonden-Schlauchanschlüsse (1) montiert. In der Meßstrecke (2) aus Isoliermaterial, das durch Rei­ bung elektrostatische Ladungserzeugung ermöglicht, werden Elektrode A (3) und Elektrode B (4) mechanisch in einem Meßstrecken-Abstand (5), je nach Material und Pulvermedium verankert.The powder transport hose of a paint shop is separated and mounted on the probe hose connections ( 1 ). In the measuring section ( 2 ) made of insulating material, which enables electrostatic charge generation by means of friction, electrode A ( 3 ) and electrode B ( 4 ) are mechanically anchored at a measuring distance ( 5 ), depending on the material and powder medium.

Die Elektrode A (3) entläd über einen niederohmigen Wider­ stand (6) alle ankommenden Ladungen gegen Erde (8). Elek­ trode B (4) entläd die auf ihr entstandene Reibungselek­ trizität ebenfalls über hochohmigen Widerstand (7) gegen Erde (8). Ein Meßverstärker (9) mißt nun nur den in der Meßstrecke entstandenen Reibungs-Elektrizitätswert, der proportional der Durchflußmenge ist, wenn alle sonstigen Parameter konstant gehalten werden oder über einen Rechner meßdatenmäßig ausgewertet werden. The electrode A ( 3 ) discharges through a low-resistance resistor ( 6 ) all incoming charges against earth ( 8 ). Electrode B ( 4 ) also discharges the friction elec tricity that arises on it via high-resistance ( 7 ) against earth ( 8 ). A measuring amplifier ( 9 ) now only measures the friction electricity value that has arisen in the measuring section, which is proportional to the flow rate if all other parameters are kept constant or are evaluated using a computer in terms of measured data.

Entscheidender Vorteil ist die Neutralisation aller vor der Messung ankommender Störmeßgrößen durch die Vorentladung der Elektrode A (3) über den Widerstand (6). Weiterhin wer­ den durch die niederohmige Entladung Spannungsüberschläge, die Brand bzw. Explosion erzeugen könnten, durch die de­ finierte Strombegrenzung verhindert.The decisive advantage is the neutralization of all interference measurement quantities arriving before the measurement by pre-discharging the electrode A ( 3 ) via the resistor ( 6 ). Furthermore, voltage flashovers that could cause a fire or explosion can be prevented by the defined current limit due to the low-resistance discharge.

Claims (5)

1. Meßsonde zur Messung der Pulver-Luft-Menge und Konzen­ tration, dadurch gekennzeichnet, daß Elektrode A (4) die Sonden-Eintrittsladung neutralisiert.1. Measuring probe for measuring the powder-air amount and concentration, characterized in that electrode A ( 4 ) neutralizes the probe inlet charge. 2. Sonde nach Anspruch 1, dadurch gekennzeichnet, daß die Neutralisation über einen niederohmigen Wider­ stand erfolgt.2. Probe according to claim 1, characterized in that neutralization via a low-resistance resistor stood. 3. Sonde nach Anspruch 1 und 2, dadurch gekennzeichnet, daß Elektrode B (5) die statische Aufladung in der Meßstrecke (6) gegenüber der Elektrode A (4) elektrisch als Signal erfaßt.3. Probe according to claim 1 and 2, characterized in that electrode B ( 5 ) detects the static charge in the measuring section ( 6 ) with respect to the electrode A ( 4 ) electrically as a signal. 4. Sonde nach Anspruch 1-3, dadurch gekennzeichnet, daß die Elektrode B (5) über einen hochohmigen Widerstand gegen Erde (8) angeschlossen ist.4. A probe according to claims 1-3, characterized in that the electrode B ( 5 ) is connected via a high-resistance to earth ( 8 ). 5. Sonde nach Anspruch 1-4, dadurch gekennzeichnet, daß die Elektrode A (4) durch gezielte Strombegrenzung Spannungsüberschläge verhindert.5. A probe according to claims 1-4, characterized in that the electrode A ( 4 ) prevents flashovers by targeted current limitation.
DE1996112141 1996-03-27 1996-03-27 Measuring probe for air concentration in electrostatic powder coating in paint shop Ceased DE19612141A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996112141 DE19612141A1 (en) 1996-03-27 1996-03-27 Measuring probe for air concentration in electrostatic powder coating in paint shop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996112141 DE19612141A1 (en) 1996-03-27 1996-03-27 Measuring probe for air concentration in electrostatic powder coating in paint shop

Publications (1)

Publication Number Publication Date
DE19612141A1 true DE19612141A1 (en) 1997-10-02

Family

ID=7789609

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1996112141 Ceased DE19612141A1 (en) 1996-03-27 1996-03-27 Measuring probe for air concentration in electrostatic powder coating in paint shop

Country Status (1)

Country Link
DE (1) DE19612141A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808765A1 (en) * 1998-03-02 1999-09-16 Wagner Int Powder coating system and method for feeding and mixing powder in a coating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808765A1 (en) * 1998-03-02 1999-09-16 Wagner Int Powder coating system and method for feeding and mixing powder in a coating system

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Legal Events

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8110 Request for examination paragraph 44
8131 Rejection