DE102019131672B3 - Procedure for leak testing a machine housing and a suitable leak testing system - Google Patents
Procedure for leak testing a machine housing and a suitable leak testing system Download PDFInfo
- Publication number
- DE102019131672B3 DE102019131672B3 DE102019131672.3A DE102019131672A DE102019131672B3 DE 102019131672 B3 DE102019131672 B3 DE 102019131672B3 DE 102019131672 A DE102019131672 A DE 102019131672A DE 102019131672 B3 DE102019131672 B3 DE 102019131672B3
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- chamber
- machine housing
- medium
- housing
- wall
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/025—Details with respect to the testing of engines or engine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/186—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3209—Details, e.g. container closure devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P1/00—Safety devices independent of the control and operation of any machine
- F16P1/02—Fixed screens or hoods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Das Verfahren und die Anlage zur eines Maschinengehäuses (12) ermöglichen eine zweistufige Prüfung in ein und derselben Anlage (10), nämlich eine Leckprüfung durch Einleitung von Druckluft in die jeweilige Kammer (16, 18) des Gehäuses (12), wobei deren Aufnahmevolumen für das Druckmedium verkleinert wird. Bei einem Druckabfall des Druckmediums wird ein Prüfmedium, vorzugsweise Formiergas, in die undichte Kammer (16, 18) eingeleitet, so dass anschließend die Leckstelle mittels eines Sensors manuell geortet werden kann.The method and the system for a machine housing (12) enable a two-stage test in one and the same system (10), namely a leak test by introducing compressed air into the respective chamber (16, 18) of the housing (12), with their receiving volume for the media is being reduced in size. In the event of a pressure drop in the pressure medium, a test medium, preferably forming gas, is introduced into the leaky chamber (16, 18) so that the leak can then be manually located by means of a sensor.
Description
Die Erfindung betrifft ein Verfahren zur Dichtigkeitsprüfung eines Maschinengehäuses nach dem Oberbegriff des Anspruchs 1 sowie eine hierfür geeignete Dichtprüfanlage nach dem Oberbegriff des Anspruchs 3.The invention relates to a method for leak testing a machine housing according to the preamble of claim 1 and a leak testing system suitable for this according to the preamble of claim 3.
Maschinengehäuse für Fahrzeugmotoren oder Elektromotoren werden im allgemeinen aus Grauguss hergestellt, bei dem aufgrund von Lunkern oder ähnlichen Fehlstellen Leckverluste entstehen können, beispielsweise im Kühlmittelkreislauf oder im Schmiermittelkreislauf. In der Fertigung ist es daher unerlässlich, wenigstens stichprobenartig Dichtigkeitsprüfungen vorzunehmen, um entweder die Leckstelle zu schließen oder bei größeren Beanstandungen das gesamte Gehäuse als Ausschuss auszusondern.Machine housings for vehicle engines or electric motors are generally made of gray cast iron, in which leakage losses can occur due to voids or similar defects, for example in the coolant circuit or in the lubricant circuit. In production, it is therefore essential to carry out at least random leakage tests in order to either close the leak or, in the event of major complaints, to reject the entire housing.
Eine Möglichkeit zur Dichtigkeitsprüfung besteht grundsätzlich darin, das Gehäuse mit einem Druckmedium zu füllen, im allgemeinen Druckluft zwischen etwa 0,5 und 3,5 bar. Anschließend wird das Gehäuse, dessen Kammern mit Druckluft gefüllt sind, in eine mit Wasser gefüllte Prüfwanne getaucht; aufsteigende Luftblasen sind dann ein Zeichen dafür, dass Leckstellen vorhanden sind. Um diese lokalisieren zu können, wird anschließend die Fehlstelle in einer gesonderten Anlage manuell mittels eines Sensors punktgenau geortet. Hierzu dient im allgemeinen ein Formiergas, das in die Kammer geleitet wird.One possibility for leak testing is basically to fill the housing with a pressure medium, generally compressed air between about 0.5 and 3.5 bar. Then the housing, the chambers of which are filled with compressed air, is immersed in a test tub filled with water; rising air bubbles are then a sign that there are leaks. In order to be able to localize this, the defect is then located in a separate system manually using a sensor. A forming gas which is fed into the chamber is generally used for this purpose.
Aus
Aus
In
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine hierzu geeignete Anlage zur Verfügung zu stellen, die die beiden herkömmlichen Prüf- und Ortungsmethoden kombiniert („verheiratet“), um eine rasche und produktionsfreundliche Prüfung ohne die bisherige Trennung der beiden Prozesse Leckprüfung und Ortung durchführen zu müssen.The invention is based on the object of providing a method and a system suitable for this purpose, which combines the two conventional testing and location methods (“married”) to enable rapid and production-friendly testing without the previous separation of the two processes of leak detection and location to have to perform.
Diese Aufgabe wird bei dem Verfahren zur Dichtigkeitsprüfung nach dem Oberbegriff des Anspruchs 1 dadurch gelöst, dass vor der Einleitung des Druckmediums ein Füllkörper in die Kammer eingebracht wird, um deren Aufnahmevolumen für das Druckmedium zu reduzieren. Damit ist es also nicht mehr erforderlich, die gesamte Kammer mit Druckluft zu füllen, was zeitaufwendig ist und die Erzeugung einer großen Druckluftmenge erfordert. Anschließend wird, wenn ein Druckabfall des Druckmediums festgestellt wird, in derselben Anlage ein Prüfmedium, vorzugsweise Formiergas, in die Kammer eingeleitet, um die Leckstelle mittels eines Sensors manuell und punktgenau zu orten.This object is achieved in the method for leak testing according to the preamble of claim 1 in that a filler body is introduced into the chamber before the pressure medium is introduced in order to reduce its capacity for the pressure medium. So it is no longer necessary to fill the entire chamber with compressed air, which is time-consuming and requires the generation of a large amount of compressed air. Then, when a pressure drop in the pressure medium is detected, a test medium, preferably forming gas, is introduced into the chamber in the same system in order to locate the leakage point manually and precisely using a sensor.
Der Vorteil der Erfindung besteht darin, dass die beiden bisher getrennten Verfahrensschritte in einem zusammenhängenden Prozess in einer einzigen Anlage durchgeführt werden können. Ein erheblicher Fortschritt ist darin zu sehen, dass die Notwendigkeit entfällt, das mit Druckmedium gefüllte Gehäuse in Wasser zu tauchen, was ohnehin nur bei kleineren Gehäuse praktikabel ist.The advantage of the invention is that the two previously separate process steps can be carried out in a coherent process in a single system. A considerable advance can be seen in the fact that there is no need to immerse the housing filled with pressure medium in water, which in any case is only practicable with smaller housings.
Bei der zur Durchführung dieses Verfahrens geeigneten Dichtprüfanlage wird gemäß Anspruch 3 ein Druckzylinder mit einem teleskopierbaren Füllstempel an eine Öffnung des Gehäuses angeschlossen, der die Aufgabe des erläuterten Füllköpers hat. Dieser wird durch den Zylinder in die Kammer eingeschoben, in die unmittelbar darauf ein Prüfmedium zur manuellen Ortung von Leckstellen eingeleitet wird. Hierzu wird an einer Anschlußöffnung des Gehäuses das Prüfmedium, vorzugsweise Formiergas, eingeleitet.In the leak test system suitable for carrying out this method, a pressure cylinder with a telescopic filling ram is connected to an opening in the housing, which has the task of the explained filling body. This is pushed through the cylinder into the chamber, into which a test medium is introduced immediately for the manual location of leaks. For this purpose, the test medium, preferably forming gas, is introduced at a connection opening in the housing.
Auch hier ist der wesentliche Vorteil der Erfindung darin zu sehen, dass keine bisher getrennten Vorrichtungen erforderlich sind, sondern eine Anlage, die die beiden Systemteile miteinander vereinigt.Here, too, the main advantage of the invention is to be seen in the fact that no previously separate devices are required, but rather a system that combines the two system parts.
Wenn nach der Einleitung des Formiergases eine Leckstelle punktgenau geortet wurde, besteht die Möglichkeit der Nachbesserung, beispielsweise durch Imprägnieren von nicht funktionsrelevanten Stellen. Größere Leckstellen führen dazu, dass das Gehäuse als Ausschuss ausgesondert wird.If a leak has been pinpointed after the formation gas has been introduced, there is the possibility of rectification, for example by impregnating non-functionally relevant areas. Larger leaks lead to the housing being rejected as scrap.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Patentansprüchen und aus der folgenden Beschreibung eines Ausführungsbeispiels, das in der Zeichnung dargestellt ist. In dieser zeigen:
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1 eine schematische Ansicht einer gemäß der Erfindung ausgebildeten Anlage, -
2 die Ansicht eines Ausführungsbeispiels mit einem Schutzgehäuse zur Aufnahme der Anlage, -
3 eine Draufsicht des Schutzgehäuses der2 , in dem die Anlage zu erkennen ist, -
4 eine perspektivische Ansicht der Anlage gemäß der Erfindung und -
5 die perspektivische Ansicht aus einem anderen Blickwinkel.
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1 a schematic view of a system designed according to the invention, -
2 the view of an embodiment with a protective housing to accommodate the system, -
3 a top view of the protective housing of2 , in which the system can be recognized, -
4th a perspective view of the plant according to the invention and -
5 the perspective view from a different angle.
In der Prinzipskizze der
An der Außenwand
Gemäß der Erfindung ist weiter vorgesehen, dass die Außenwand
Den
Die
Die
Aus den
Die Dichtigkeitsprüfung durch die Anlage
Claims (7)
Priority Applications (1)
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DE102019131672.3A DE102019131672B3 (en) | 2019-11-22 | 2019-11-22 | Procedure for leak testing a machine housing and a suitable leak testing system |
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DE102019131672.3A DE102019131672B3 (en) | 2019-11-22 | 2019-11-22 | Procedure for leak testing a machine housing and a suitable leak testing system |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3221539A (en) * | 1958-12-10 | 1965-12-07 | Ajem Lab Inc | Method and apparatus for leak testing castings |
DE10103412A1 (en) * | 2001-01-26 | 2002-08-01 | Deutsche Telekom Ag | Detection of leaks in hollow conduits by pressure drop leak detection, with a marker gas used for fine leak detection, with the invention concerning a gas change over device that prevents pressure loss in the conduit |
DE10241368A1 (en) * | 2002-09-06 | 2004-04-01 | Bayerische Motoren Werke Ag | Leak testing hollow chamber, especially engine crankcase, involves sealing opening and dividing plane, filling hollow volumes with pressure medium, applying test pressure, detecting pressure variation |
US9863838B2 (en) * | 2015-02-03 | 2018-01-09 | Citic Dicastal Co., Ltd | Air tightness detection device for aluminum alloy wheel hub and method for detecting air tightness of wheel hub |
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2019
- 2019-11-22 DE DE102019131672.3A patent/DE102019131672B3/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3221539A (en) * | 1958-12-10 | 1965-12-07 | Ajem Lab Inc | Method and apparatus for leak testing castings |
DE10103412A1 (en) * | 2001-01-26 | 2002-08-01 | Deutsche Telekom Ag | Detection of leaks in hollow conduits by pressure drop leak detection, with a marker gas used for fine leak detection, with the invention concerning a gas change over device that prevents pressure loss in the conduit |
DE10241368A1 (en) * | 2002-09-06 | 2004-04-01 | Bayerische Motoren Werke Ag | Leak testing hollow chamber, especially engine crankcase, involves sealing opening and dividing plane, filling hollow volumes with pressure medium, applying test pressure, detecting pressure variation |
US9863838B2 (en) * | 2015-02-03 | 2018-01-09 | Citic Dicastal Co., Ltd | Air tightness detection device for aluminum alloy wheel hub and method for detecting air tightness of wheel hub |
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