DE429431C - Adjustable measuring nozzle - Google Patents

Adjustable measuring nozzle

Info

Publication number
DE429431C
DE429431C DEA45711D DEA0045711D DE429431C DE 429431 C DE429431 C DE 429431C DE A45711 D DEA45711 D DE A45711D DE A0045711 D DEA0045711 D DE A0045711D DE 429431 C DE429431 C DE 429431C
Authority
DE
Germany
Prior art keywords
measuring nozzle
pin
adjustable measuring
gas
cylindrical
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
Application number
DEA45711D
Other languages
German (de)
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.)
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Publication date
Priority to DEA45711D priority Critical patent/DE429431C/en
Application granted granted Critical
Publication of DE429431C publication Critical patent/DE429431C/en
Expired 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
    • G01F1/05—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
    • G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)

Description

Einstellbare Meßdüse. Zur Bestimmung kleinster Gasmengen, die von einem Raum in den andern strömen, hat man sich bisher eines durch Mikrometerschraube verstellbaren Nadelventils bedient. Dieses genügte aber den gesteigerten Anforderungen an Genauigkeit nicht mehr, so daß man beispielsweise bei der Eichung von Hochvakuumpumpen Fehler von verhältnismäßig hohem Prozentsatz zuzulassen gezwungen war. Das Bedürfnis nach einer genauen und zuverlässigen Meßdüse lag daher vor. Durch die Erfindung wird es befriedigt. Danach besteht diese Meßdüse aus einem zylindrischen Rohrstück, das in die Leitung für die zu messende Gasmenge eingeschaltet ist, und einem darin praktisch ohne Spiel gleitenden, achsial durch Mikrometerschraube verschiebbaren, zylindrischen Stift, der auf einer Seite einen' ebenen, gegen die Stiftachse schwach geneigten Anschliff besitzt.Adjustable measuring nozzle. For the determination of the smallest amounts of gas that One room flows into the other, so far one has got one by means of a micrometer screw adjustable needle valve operated. However, this was sufficient for the increased requirements no longer in terms of accuracy, so that, for example, when calibrating high vacuum pumps Was forced to admit errors of a relatively high percentage. The need there was therefore a need for an accurate and reliable measuring nozzle. Through the invention it will be satisfied. Then this measuring nozzle consists of a cylindrical piece of pipe, which is switched into the line for the amount of gas to be measured, and one in it Sliding with practically no play, axially displaceable by means of a micrometer screw, cylindrical pin, which is flat on one side, weak against the axis of the pin has an inclined bevel.

In welcher Weise eine solche Meßdüse ausgebildet sein kann, ist aus der Zeichnung ersichtlich, in der Abb. r einen Längsschnitt, Abb. a einen Querschnitt durch den Apparat darstellt. Durch das Rohrstück c werden die Räume a und b miteinander verbunden. Der zu messende Gasstrom bewegt sich in Richtun- der gestrichelten Pfeile von a nach b. In das Rohrstück c ragt von oben, genau passend, der Stift d hinein, der in Richtung der ausgezogenen Pfeile durch eine nicht gezeichnete Feineinstellvorrichtung, bewegt werden kann. Seitlich besitzt der Stift d einen schwach geneigten ebenen Anschliff e, der am unteren Stiftende am meisten Material vom Stift fortgenommen hat und oben bei f .endigt. Wie man aus Abb. a erkennt, bleibt für den Gasdurchtritt zwischen. e und c,ein segmentförmiger, freier Querschnitt übrig, dessen Größe durch Messung und Eichung für alle Stiftstellungen mit großer Genauigkeit festgestellt werden kann.The manner in which such a measuring nozzle can be designed can be seen from the drawing, in which Fig. R shows a longitudinal section and Fig. A shows a cross section through the apparatus. The spaces a and b are connected to one another by the pipe section c. The gas flow to be measured moves in the direction of dashed arrows from a to b. The pin d protrudes into the pipe section c from above, exactly fitting, and can be moved in the direction of the solid arrows by a fine adjustment device (not shown). On the side, the pin d has a slightly inclined, flat bevel e, which has removed most of the material from the pin at the lower end of the pin and ends at f at the top. As can be seen from Fig. A, there is between. e and c, a segment-shaped, free cross-section, the size of which can be determined with great accuracy by measurement and calibration for all pin positions.

Claims (1)

PATENT-ANSPRUcii: Einstellbare Meßdüs:e zur Bestimmung kleinster hindurchströmender Gasmengen, dadurch gekennzeichnet, daß in die von der Gasmenge durchströmte Leitung ein zylindrisches Rohrstück eingeschaltet und in dieses praktisch ohne Spiel gleitend ein zylindrischer Stift achsial verschiebbar ist, der auf einer Seite einen ebenen, gegen die Stiftachse schwach geneigten Anschliff besitzt, PATENT REQUIREMENTS: Adjustable measuring nozzles: e for determining the smallest quantities of gas flowing through, characterized in that a cylindrical pipe section is inserted into the line through which the gas quantity flows and a cylindrical pin is axially displaceable in this, with practically no play, which on one side has a flat, has a slightly inclined bevel towards the pin axis,
DEA45711D Adjustable measuring nozzle Expired DE429431C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA45711D DE429431C (en) Adjustable measuring nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA45711D DE429431C (en) Adjustable measuring nozzle

Publications (1)

Publication Number Publication Date
DE429431C true DE429431C (en) 1926-05-22

Family

ID=6934864

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA45711D Expired DE429431C (en) Adjustable measuring nozzle

Country Status (1)

Country Link
DE (1) DE429431C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117446A (en) * 1962-04-06 1964-01-14 Walter F Green Fuel flow meter construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117446A (en) * 1962-04-06 1964-01-14 Walter F Green Fuel flow meter construction

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