EP0861420A1 - Device for measuring the mass of a flowing medium - Google Patents

Device for measuring the mass of a flowing medium

Info

Publication number
EP0861420A1
EP0861420A1 EP97939958A EP97939958A EP0861420A1 EP 0861420 A1 EP0861420 A1 EP 0861420A1 EP 97939958 A EP97939958 A EP 97939958A EP 97939958 A EP97939958 A EP 97939958A EP 0861420 A1 EP0861420 A1 EP 0861420A1
Authority
EP
European Patent Office
Prior art keywords
measuring
flow straightener
mass
flowing medium
carrier ring
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.)
Withdrawn
Application number
EP97939958A
Other languages
German (de)
French (fr)
Inventor
Gerhard HÜFTLE
Thomas Alber
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0861420A1 publication Critical patent/EP0861420A1/en
Withdrawn legal-status Critical Current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
    • G01F1/68—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 thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • 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
    • G01F1/68—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 thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus

Definitions

  • the invention relates to a device for measuring the mass of a flowing medium according to the preamble of claim 1.
  • a device is already known (EPOS 0 458 998) which has a measuring element housed in a measuring nozzle, a flow straightener with a grating being provided upstream of the measuring element.
  • the flow straightener is provided to generate a flow that is as uniform as possible over the entire inner cross section.
  • the grating permanently attached to the flow straightener is used to generate the finest vortices, which means that the flow remains constant downstream of the grating
  • Flow conditions to stabilize the measurement signal are to be generated.
  • the grating is attached to the flow straightener by embedding the grille in the heated state in a ring of the flow straightener.
  • expelled plastic is embedded in the flow straightener remains, so that there are obstacles in the flow, which lead to signal scattering, especially in mass production.
  • the method of fastening the flow straightener provided by deforming webs and grooves is relatively complex.
  • the device according to the invention for measuring the mass of a flowing medium with the characterizing features of claim 1 has the advantage that devices can be produced in a particularly simple manner, which have a flow straightener with a grid in different designs. It is particularly advantageous that the manufacturing costs are reduced by a simple manufacturing method.
  • Flow rectifier with wire mesh can be realized in a simple manner. Furthermore, grids with different mesh sizes and wire thickness without special tools. Burr-free embedding of the lattice, which can be achieved by melting the shoots, is particularly advantageous. It is also advantageous that the wire mesh can be applied to a carrier ring without a sag. It is advantageously possible to achieve any distance between the flow straightener and the grating by the formation of the width of the support ring. Furthermore, it follows that the flow straightener and the grille are available individually for a planned disassembly, which can then be separated in a simple manner for a planned recycling. It is also possible to install several grids upstream of the flow straightener. Of special
  • FIG. 2 shows an enlarged section of the device within a dash-dotted line II in FIG. 1
  • FIG. 3 shows a top view of a flow straightener
  • FIG. 4 shows a top view of a grid
  • FIG. 5 shows a partial side view of the grid according to FIG. 4. Description of the embodiment
  • FIG. 1 shows in cross section a device 1 for measuring the mass of a flowing medium, in particular the intake air mass of internal combustion engines.
  • the internal combustion engine can be a mixture-compressing, spark-ignited or also an air-compressing, self-igniting.
  • the device 1 has a measuring part 2, which can be inserted, for example, in a measuring connection 5 of the device 1.
  • the measuring part 2 has
  • Example a slender, rod-shaped, rectangular shape extending in the direction of a plug-in axis 10 and is inserted, for example, in an opening recessed from a wall 8 of the measuring nozzle 5.
  • the wall 8 delimits a flow cross section leading to
  • Example has a circular cross section, in the middle of which, in the direction 18 of the flowing medium, extends parallel to the wall 8, a central axis 11 which is oriented perpendicular to the plug axis 10.
  • the direction of the flowing medium is indicated in FIGS. 1, 2 and 5 by corresponding arrows 18 and runs from left to right there.
  • a measuring element 14 is introduced with the measuring part 2 into the flowing medium.
  • a measuring channel 15 is formed in the measuring part 2 of the device 1, in which the measuring element 14 for measuring the medium flowing in the measuring nozzle 5 is accommodated.
  • the construction of such a measuring part 2 with measuring element 14 is well known to the person skilled in the art, for example from DE-OS 44 07 209, the disclosure of which
  • Upstream of the measuring element 14 is a
  • the flow straightener 20 is made of plastic, which can be produced by injection molding. Downstream of the flow straightener 20 is a
  • Carrier ring 22 is provided, which carries the grid 21.
  • the carrier ring 22 consists of thermoelastic plastic.
  • the grid 21 consists, for example, of an inert metal such as stainless steel and can have any wire thickness and mesh size.
  • the wire mesh of the grid 21 is fastened by embedding it in the plastic of the carrier ring 22. This can be done, for example, by ultrasonic welding or by hot embedding.
  • the plastic expelled during the embedding of the wire mesh can be removed, for example by means of a laser, by melting onto the ring contour 24 shown in FIG. 4, in order to avoid interference from plastic protruding from the edge of the ring contour 24.
  • the latter is inserted with the carrier ring 22 into a, for example circular, opening 23 provided at the upstream end of the measuring nozzle 5 until the carrier ring 22 abuts a stop 25, so that the grille 21 is located downstream.
  • the flow straightener 20 can then flow into the
  • Opening 23 are used until it abuts the carrier ring 22.
  • an annular edge 26 remaining at the end of the measuring connection 5 can be permanently deformed, for example by flanging, in order to fasten the flow straightener 20 with the grating 21 in the measuring connection 5.
  • the flanging can be done by The plastic of the measuring nozzle 5 is melted, for example by means of ultrasound or by hot forming. It is also conceivable to deform the ring rim 26 only partially on the circumference.
  • webs 30, 31 are provided which protrude radially from the lateral surface 33 of the flow straightener 20 or 34 of the carrier ring 22 in order to fit into corresponding grooves in the opening 23 of the measuring connection 5 to be introduced.
  • three webs 30 are provided on the flow straightener 20 and three webs 31 on the carrier ring 22, for example.
  • the opening 23 of the measuring nozzle 5 has three grooves 36 which can accommodate the webs 30, 31.
  • a protective grid (not shown in more detail) which is intended to protect the measuring part 2 against mechanical influences, for example against direct contact with the hand. It is so wide-meshed that it does not significantly affect the measuring accuracy of the measuring element 14 or the air mass flow.

Abstract

Known devices for measuring the mass of a flowing medium present a measuring element accommodated in a measuring connector piece, whereby a flow straightener provided with bars is located downstream the measuring element. In order to produce bars easily and and fit them precisely, a support ring (22) is provided. Said ring supports bar (21) so that two parts, a flow straightener (20) and a support ring, (20) are available, wherein the rim of the ring (25) of the measuring connector piece (26) is flattened down thereby ensuring permanent fastening of the flow straightener (20). The device is designed to measure the mass of a flowing medium, especially in order to measure the mass of intake air in internal combustion engines.

Description

_ _
Vorrichtung zur Messung der Masse eines strömenden MediumsDevice for measuring the mass of a flowing medium
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zur Messung der Masse eines strömenden Mediums nach der Gattung des Anspruchs l. Es ist bereits eine Vorrichtung bekannt (EPOS 0 458 998) , die ein in einem Meßstutzen untergebrachtes Meßelement besitzt, wobei stromaufwärts des Meßelements ein Strömungsgleichrichter mit einem Gitter vorgesehen ist. Der Strömungsgleichrichter ist zur Erzeugung einer über den gesamten Innenquerschnitt möglichst gleichmäßigen Strömung vorgesehen. Das am Strömungsgleichrichter dauerhaft befestigte Gitter dient dabei zur Erzeugung feinster Wirbel, wodurch stromabwärts des Gitters gleichbleibendeThe invention relates to a device for measuring the mass of a flowing medium according to the preamble of claim 1. A device is already known (EPOS 0 458 998) which has a measuring element housed in a measuring nozzle, a flow straightener with a grating being provided upstream of the measuring element. The flow straightener is provided to generate a flow that is as uniform as possible over the entire inner cross section. The grating permanently attached to the flow straightener is used to generate the finest vortices, which means that the flow remains constant downstream of the grating
Strömungsverhältnisse zur Stabilisierung des Meßsignals erzeugt werden sollen. Um eine Kennlinienstreuung des vom Meßelement abgegebenen Meßsignals zu vermeiden, ist es besonders wichtig, das Gitter in präziser Ausrichtung zu dem Strömungsgleichrichter zu orientieren. Bei der bekannten Vorrichtung erfolgt die Befestigung des Gitters am Strömungsgleichrichter durch Einbetten des Gitters in erhitztem Zustand in einen Ring des Strδmungsgleichrichters . Dabei ergibt sich jedoch der Nachteil, daß beim Einbetten ausgetriebener Kunststoff im Strömungsgleichrichter verbleibt, so daß sich Hindernisse in der Strömung ergeben, welche zu einer Signalstreuung, insbesondere bei einer Massenherstellung führen. Des weiteren ist die durch Verformen von Stegen und Nuten vorgesehene Befestigungsweise des Strömungsgleichrichters relativ aufwendig. Ferner ist die vorgesehene Ausbildung eines Ringes, der von einer senkrecht zur Strömungsrichtung angeordneten Oberfläche des Strömungsgleichrichters herausragt, fertigungstechnisch aufwendig. Da das Gitter an dem Strömungsgleichrichter dauerhaft befestigt ist, können nur relativ schwierig Strömungsgleichrichter mit Gittern unterschiedlicher Maschenweite beliebig miteinander kombiniert werden.Flow conditions to stabilize the measurement signal are to be generated. In order to avoid spreading the characteristic of the measurement signal emitted by the measuring element, it is particularly important to orient the grating in a precise alignment with the flow straightener. In the known device, the grating is attached to the flow straightener by embedding the grille in the heated state in a ring of the flow straightener. However, there is the disadvantage that expelled plastic is embedded in the flow straightener remains, so that there are obstacles in the flow, which lead to signal scattering, especially in mass production. Furthermore, the method of fastening the flow straightener provided by deforming webs and grooves is relatively complex. Furthermore, the proposed formation of a ring, which protrudes from a surface of the flow straightener arranged perpendicular to the direction of flow, is complex in terms of production technology. Since the grille is permanently attached to the flow straightener, flow straighteners with grids of different mesh sizes can only be combined with one another with relative difficulty.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung zur Messung der Masse eines strömenden Mediums mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß in besonders einfacher Art und Weise Vorrichtungen herstellbar sind, die einen Strömungsgleichrichter mit einem Gitter in unterschiedlicher Ausführung aufweisen. Von besonderem Vorteil ist dabei, daß durch eine einfache Herstellungsweise sich die Herstellungskosten reduzieren.The device according to the invention for measuring the mass of a flowing medium with the characterizing features of claim 1 has the advantage that devices can be produced in a particularly simple manner, which have a flow straightener with a grid in different designs. It is particularly advantageous that the manufacturing costs are reduced by a simple manufacturing method.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Vorrichtung möglich.Advantageous further developments and improvements of the device specified in claim 1 are possible through the measures listed in the subclaims.
Von Vorteil ist, daß Sonderformen desIt is advantageous that special forms of
Strömungsgleichrichters mit Drahtgitter in einfacher Art und Weise verwirklicht werden können. Des weiteren können Gitter mit unterschiedlicher Maschenweite und Drahtstärke ohne besonderen Werkzeugaufwand ausgeführt werden. Von besonderem Vorteil ist dabei eine gratfreie Einbettung des Gitters, welche durch Abschmelzen des Austriebes verwirklicht werden kann. Von Vorteil ist auch, daß das Drahtgewebe auf einem Trägerring ohne einen Durchhang aufgebracht werden kann. Dabei ist es in vorteilhafter Weise möglich, jeden beliebigen Abstand zwischen dem Strömungsgleichrichter und dem Gitter durch die Ausbildung der Breite des Trägerringes zu erzielen. Des weiteren ergibt sich, daß für eine vorgesehene Demontage der Strömungsgleichrichter und das Gitter einzeln vorliegen, die dann für eine vorgesehene Wiederverwertung in einfacher Art und Weise trennbar sind. Außerdem ist es möglich, mehrere Gitter auch stromaufwärts des Strömungsgleichrichters einzubauen. Von besonderemFlow rectifier with wire mesh can be realized in a simple manner. Furthermore, grids with different mesh sizes and wire thickness without special tools. Burr-free embedding of the lattice, which can be achieved by melting the shoots, is particularly advantageous. It is also advantageous that the wire mesh can be applied to a carrier ring without a sag. It is advantageously possible to achieve any distance between the flow straightener and the grating by the formation of the width of the support ring. Furthermore, it follows that the flow straightener and the grille are available individually for a planned disassembly, which can then be separated in a simple manner for a planned recycling. It is also possible to install several grids upstream of the flow straightener. Of special
Vorteil ist dabei, daß der Strömungsgleichrichter mit dem Gitter in Massenfertigung sehr kostengünstig herstellbar ist .The advantage here is that the flow straightener with the grid can be mass-produced very inexpensively.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eineAn embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a
Vorrichtung in teilweiser Schnittdarstellung, Figur 2 einen vergrößerten Ausschnitt der Vorrichtung innerhalb einer strichpunktierten Linie II in Figur 1, Figur 3 eine Draufsicht auf einen Strömungsgleichrichter, Figur 4 eine Draufsicht auf ein Gitter, Figur 5 eine teilweise Seitenansicht des Gitters nach Figur 4. Beschreibung des Ausführungsbeispiels2 shows an enlarged section of the device within a dash-dotted line II in FIG. 1, FIG. 3 shows a top view of a flow straightener, FIG. 4 shows a top view of a grid, FIG. 5 shows a partial side view of the grid according to FIG. 4. Description of the embodiment
In Figur 1 ist im Querschnitt eine Vorrichtung 1 zur Messung der Masse eines strömenden Mediums, insbesondere der Ansaugluftmasse von Brennkraf maschinen, gezeigt. Bei der1 shows in cross section a device 1 for measuring the mass of a flowing medium, in particular the intake air mass of internal combustion engines. In the
Brennkraftmaschine kann es sich um eine gemischverdichtende, fremdgezündete oder auch um eine luftverdichtende, selbstzündende handeln. Die Vorrichtung 1 besitzt ein Meßteil 2, das in einen Meßstutzen 5 der Vorrichtung 1 zum Beispiel steckbar eingebracht ist. Das Meßteil 2 hat zumThe internal combustion engine can be a mixture-compressing, spark-ignited or also an air-compressing, self-igniting. The device 1 has a measuring part 2, which can be inserted, for example, in a measuring connection 5 of the device 1. The measuring part 2 has
Beispiel eine schlanke, stabfδrmige, sich in Richtung einer Steckachse 10 länglich erstreckende, quaderförmige Gestalt und ist in eine aus einer Wandung 8 des Meßstutzens 5 ausgenommenen Öffnung beispielsweise steckbar eingeführt. Die Wandung 8 begrenzt einen Strömungsquerschnitt, der zumExample, a slender, rod-shaped, rectangular shape extending in the direction of a plug-in axis 10 and is inserted, for example, in an opening recessed from a wall 8 of the measuring nozzle 5. The wall 8 delimits a flow cross section leading to
Beispiel einen kreisförmigen Querschnitt aufweist, in dessen Mitte sich in Richtung 18 des strömenden Mediums, parallel zur Wandung 8 eine Mittelachse 11 erstreckt, die senkrecht zur Steckachse 10 orientiert ist. Die Richtung des strömenden Mediums ist in den Figuren 1, 2 und 5 durch entsprechende Pfeile 18 gekennzeichnet und verläuft dort von links nach rechts.Example has a circular cross section, in the middle of which, in the direction 18 of the flowing medium, extends parallel to the wall 8, a central axis 11 which is oriented perpendicular to the plug axis 10. The direction of the flowing medium is indicated in FIGS. 1, 2 and 5 by corresponding arrows 18 and runs from left to right there.
Ein Meßelement 14 ist mit dem Meßteil 2 in das strömende Medium eingebracht. In dem Meßteil 2 der Vorrichtung 1 ist ein Meßkanal 15 ausgebildet, in welchem das Meßelement 14 zur Messung des im Meßstutzen 5 strömenden Mediums untergebracht ist. Der Aufbau eines derartigen Meßteils 2 mit Meßelement 14 ist dem Fachmann zum Beispiel aus der DE- OS 44 07 209 hinreichend bekannt, deren OffenbarungA measuring element 14 is introduced with the measuring part 2 into the flowing medium. A measuring channel 15 is formed in the measuring part 2 of the device 1, in which the measuring element 14 for measuring the medium flowing in the measuring nozzle 5 is accommodated. The construction of such a measuring part 2 with measuring element 14 is well known to the person skilled in the art, for example from DE-OS 44 07 209, the disclosure of which
Bestandteil der hier vorliegenden Patentanmeldung sein soll. Stromaufwärts des Meßelements 14 ist einTo be part of the present patent application. Upstream of the measuring element 14 is a
Strδmungsgleichrichter 20 mit einem Gitter 21 vorgesehen. Der Strömungsgleichrichter 20 besteht aus Kunststoff, welcher durch Spritzgießen hergestellt werden kann. Stromabwärts des Strömungsgleichrichters 20 ist einFlow rectifier 20 provided with a grid 21. The flow straightener 20 is made of plastic, which can be produced by injection molding. Downstream of the flow straightener 20 is a
Trägerring 22 vorgesehen, welcher das Gitter 21 trägt. Der Trägerring 22 besteht aus thermoelastisehern Kunststoff. Das Gitter 21 besteht zum Beispiel aus einem reaktionsträgen Metall wie beispielsweise Edelstahl und kann eine beliebige Drahtstärke und Maschenweite aufweisen. Das Drahtgewebe des Gitters 21 wird durch Einbetten in den Kunststoff des Trägerrings 22 befestigt. Dies kann zum Beispiel durch Ultraschall-Schweißen oder durch Warmeinbetten erfolgen. Der beim Einbetten des Drahtgewebes ausgetriebene Kunststoff kann beispielsweise mittels eines Lasers durch Anschmelzen an die in Figur 4 dargestellte Ringkontur 24 beseitigt werden, um so eine Störung durch am Rand der Ringkontur 24 überstehenden Kunststoff zu vermeiden.Carrier ring 22 is provided, which carries the grid 21. The carrier ring 22 consists of thermoelastic plastic. The grid 21 consists, for example, of an inert metal such as stainless steel and can have any wire thickness and mesh size. The wire mesh of the grid 21 is fastened by embedding it in the plastic of the carrier ring 22. This can be done, for example, by ultrasonic welding or by hot embedding. The plastic expelled during the embedding of the wire mesh can be removed, for example by means of a laser, by melting onto the ring contour 24 shown in FIG. 4, in order to avoid interference from plastic protruding from the edge of the ring contour 24.
Zur Montage des Gitters 21 wird dieses mit dem Trägerring 22 in eine am stromaufwärts gelegenen Ende des Meßstutzens 5 vorgesehene, beispielsweise kreisförmige Öffnung 23 eingeführt, bis der Trägerring 22 an einem Anschlag 25 anliegt, so daß das Gitter 21 stromabwärts liegt. Anschließend kann der Strömungsgleichrichter 20 in dieTo assemble the grille 21, the latter is inserted with the carrier ring 22 into a, for example circular, opening 23 provided at the upstream end of the measuring nozzle 5 until the carrier ring 22 abuts a stop 25, so that the grille 21 is located downstream. The flow straightener 20 can then flow into the
Öffnung 23 eingesetzt werden, bis dieser an dem Trägerring 22 anliegt. Zur dauerhaften Befestigung des Strömungsgleichrichters 20 mit dem Gitter 21 kann ein am Ende des Meßstutzens 5 verbleibender Ringrand 26 zum Beispiel durch Umbördeln dauerhaft verformt werden, um so den Strömungsgleichrichter 20 mit dem Gitter 21 im Meßstutzen 5 zu befestigen. Das Umbördeln kann durch Aufschmelzen des Kunststoffs des Meßstutzens 5 beispielsweise mittels Ultraschall oder durch Warmumformen erfolgen. Denkbar ist auch, den Ringrand 26 nur teilweise am Umfang zu verformen.Opening 23 are used until it abuts the carrier ring 22. For permanent fastening of the flow straightener 20 with the grating 21, an annular edge 26 remaining at the end of the measuring connection 5 can be permanently deformed, for example by flanging, in order to fasten the flow straightener 20 with the grating 21 in the measuring connection 5. The flanging can be done by The plastic of the measuring nozzle 5 is melted, for example by means of ultrasound or by hot forming. It is also conceivable to deform the ring rim 26 only partially on the circumference.
Wie in Figur 5, einer Seitenansicht auf den Trägerring 22 mit dem Gitter 21, dargestellt ist, kann dieser zum leichten Einbau eine Abschrägung 27 aufweisen, welche zum Beispiel mittels eines Laserstrahls durch Abschmelzen des Kunststoffs herstellbar ist. Zur eindeutigen radialen Lagefixierung des Gitters 21 beispielsweise fluchtend zu einem Kunststoffgitter 29 des Strömungsgleichrichters 20 sind Stege 30, 31 vorgesehen, die von der Mantelfläche 33 des Strδmungsgleichrichters 20 beziehungsweise 34 des Trägerrings 22 radial abstehen, um in entsprechende Nuten in der Öffnung 23 des Meßstutzens 5 eingeführt zu werden. Bei dem vorliegenden Ausführungsbeispiel sind beispielsweise drei Stege 30 am Strömungsgleichrichter 20 und drei Stege 31 am Trägerring 22 vorgesehen. In entsprechender Weise besitzt die Öffnung 23 des Meßstutzens 5 drei Nuten 36, welche die Stege 30, 31 aufnehmen können.As shown in FIG. 5, a side view of the carrier ring 22 with the grating 21, this can have a bevel 27 for easy installation, which can be produced, for example, by means of a laser beam by melting the plastic. For a clear radial position fixation of the grille 21, for example in alignment with a plastic grille 29 of the flow straightener 20, webs 30, 31 are provided which protrude radially from the lateral surface 33 of the flow straightener 20 or 34 of the carrier ring 22 in order to fit into corresponding grooves in the opening 23 of the measuring connection 5 to be introduced. In the present exemplary embodiment, three webs 30 are provided on the flow straightener 20 and three webs 31 on the carrier ring 22, for example. Correspondingly, the opening 23 of the measuring nozzle 5 has three grooves 36 which can accommodate the webs 30, 31.
Am stromabwärtigen Ende des Meßstutzens 5 befindet sich ein nicht näher dargestelltes Schutzgitter, welches das Meßteil 2 vor mechanischen Einwirkungen schützen soll, beispielsweise vor direktem Berühren mit der Hand. Es ist so weitmaschig gefertigt, daß es weder die Meßgenauigkeit des Meßelements 14 noch den Luftmassenstrom merklich beeinflußt. At the downstream end of the measuring nozzle 5 there is a protective grid (not shown in more detail) which is intended to protect the measuring part 2 against mechanical influences, for example against direct contact with the hand. It is so wide-meshed that it does not significantly affect the measuring accuracy of the measuring element 14 or the air mass flow.

Claims

Patentansprüche claims
1. Vorrichtung zur Messung der Masse eines strömenden Mediums, mit einem in einem Meßstutzen untergebrachten Meßelement und einem stromaufwärts des Meßelements vorgesehenen Strömungsgleichrichter und einem Gitter, dadurch gekennzeichnet, daß das Gitter (21) an einem separaten Trägerring (22) angebracht ist und der Trägerring (22) sowie der Strömungsgleichrichter (20) in eine Öffnung (23) des Meßstutzens (5) einführbar und darin fixierbar sind.1. A device for measuring the mass of a flowing medium, with a measuring element accommodated in a measuring nozzle and a flow straightener provided upstream of the measuring element and a grid, characterized in that the grid (21) is attached to a separate carrier ring (22) and the carrier ring (22) and the flow straightener (20) can be inserted into an opening (23) of the measuring nozzle (5) and can be fixed therein.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Strömungsgleichrichter (20) und der Trägerring (22) durch Verformen einer Ringkontur (26) des Meßstutzens (5) am Meßstutzen (5) fixiert sind.2. Device according to claim 1, characterized in that the flow straightener (20) and the carrier ring (22) are fixed by deforming an annular contour (26) of the measuring nozzle (5) on the measuring nozzle (5).
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Trägerring (22) aus Kunststoff besteht und das Gitter (21) durch Ultraschall-Schweißen oder Warmeinbetten am Trägerring (22) befestigt ist. 3. Apparatus according to claim 1, characterized in that the carrier ring (22) consists of plastic and the grid (21) is attached to the carrier ring (22) by ultrasonic welding or hot embedding.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Gitter (21) eine Abschrägung (27) aufweist.4. The device according to claim 3, characterized in that the grid (21) has a bevel (27).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Abschrägung (27) durch Abschmelzen des Kunststoffs mittels Laser erfolgt. 5. The device according to claim 4, characterized in that the bevel (27) is carried out by melting the plastic by means of a laser.
EP97939958A 1996-09-16 1997-08-19 Device for measuring the mass of a flowing medium Withdrawn EP0861420A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19637647 1996-09-16
DE19637647A DE19637647A1 (en) 1996-09-16 1996-09-16 Device for measuring the mass of a flowing medium
PCT/DE1997/001771 WO1998012509A1 (en) 1996-09-16 1997-08-19 Device for measuring the mass of a flowing medium

Publications (1)

Publication Number Publication Date
EP0861420A1 true EP0861420A1 (en) 1998-09-02

Family

ID=7805749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97939958A Withdrawn EP0861420A1 (en) 1996-09-16 1997-08-19 Device for measuring the mass of a flowing medium

Country Status (7)

Country Link
US (1) US6276198B1 (en)
EP (1) EP0861420A1 (en)
JP (1) JP2000500877A (en)
KR (1) KR100507937B1 (en)
CN (1) CN1131998C (en)
DE (1) DE19637647A1 (en)
WO (1) WO1998012509A1 (en)

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CN1200805A (en) 1998-12-02
KR19990067472A (en) 1999-08-25
WO1998012509A1 (en) 1998-03-26
KR100507937B1 (en) 2005-10-19
CN1131998C (en) 2003-12-24
US6276198B1 (en) 2001-08-21
JP2000500877A (en) 2000-01-25
DE19637647A1 (en) 1998-03-19

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