Device for combined suction and bubble extraction as part of a cleanliness test according to VDA 19.1 / ISO 16 232

Abstract

The device for combined suction and bubble extraction as part of a cleanliness test according to VDA 19.1 / ISO 16 232 is characterized in that it enables for the first time a combination of suction and bubble extraction.

Description

[0001] The cleanliness extraction process according to VDA 19.1 / ISO 16 232 comprises the following three steps: 1. Extraction, 2. Drying, and 3. Analysis. In the first step, extraction, residual dirt particles are transferred from a component to an analysis filter using a liquid or gas. If extraction is performed using a liquid, the analysis filter must be dried in the second step. In the third step, analysis, the particles on the analysis filter are counted and measured.

[0002] With the advancement of electromobility and autonomous driving, electronic components are increasingly being tested for technical cleanliness, for which extraction using a liquid is not suitable. Therefore, extraction using a gas (air extraction) is becoming increasingly important. Existing air extraction devices use a nozzle to extract the particles from the component. This has the disadvantage that, on the one hand, airborne particles from the environment can be sucked in, which can distort the results. On the other hand, the suction effect is often insufficient to reliably remove all particles from the component.

[0003] The device considered here for combined suction and blow extraction as part of a cleanliness inspection according to VDA 19.1 / ISO 16 232 consists of an airtight container into which purified compressed air can be blown via a hose with a nozzle at the end. The nozzle serves to loosen residual dirt particles from a component under test and release them into the container. At the lower end of the conical base is a suction device that sucks in the supplied compressed air, including the particles detached from the component. The suction device has a filter carrier equipped with an analysis filter. The particles are thus drawn onto the filter via the air duct and are thus available for analysis.

[0004] Alternatively, the extracted air can create a vacuum in the container. Once the air has passed through the analysis filter, it is returned to the container via a hose with a nozzle at the end. Since the nozzle has a smaller cross-section than the extraction device, the air is accelerated within it, allowing it to be used to blow off residual dirt particles from the component. The particles thus blown off are captured by the extraction flow as described above and transferred to the analysis filter. The cycle is thus completed.

[0005] The system offers the advantage that residual dirt particles can be removed from a component with greater intensity using a nozzle than is possible with pure suction extraction. Furthermore, particles from the ambient air, which should not be included in the final result, cannot be captured. The system thus enables combined suction and blow extraction for the first time. List of reference symbols 1 intervention 2 nozzles 3 Unit for holding an analysis filter 4 Compressor 5 Valve 6 air filters 7 housings 8 compressed air hose

Claims

[1] The device for a combined suction and blow extraction within the framework of a cleanliness inspection according to VDA 19.1 / ISO 16 232 is characterized by that for the first time a combination of suction and blow extraction is possible. [2] The device according to claim 1 is characterized by that a gaseous extraction medium can also be circulated in a closed system as part of a cleanliness test according to VDA 19.1 / ISO 16 232. [3] The device according to claim 1 is characterized by that no airborne particles from the environment can be included in the result of the cleanliness test according to VDA 19.1 / ISO 16 232. [4] The device according to claim 1 is characterized by that particles can be extracted from a component more reliably than is the case with pure air extraction. [5] The device according to claim 1 is characterized bythat it enables air extraction according to VDA 19.1 / ISO 16 232 in a closed extraction cabinet. [6] The device according to claim 1 is characterized by that it enables air extraction according to VDA 19.1 / ISO 16 232 in an extraction cabinet without the use of an additional liquid extraction medium.

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