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Fluidic Switch

IP.com Disclosure Number: IPCOM000090070D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Krakinowski, M: AUTHOR

Abstract

Fluidic single inlet and two inlet differential switches 3 and 4 in drawings 1 and 2 respectively include a pressure sensing wafer 5 and a split housing. Upper housings 6 and lower housing 9 have a thin elastomeric film seal 8. Wafers 5 are held between upper housings 6 and lower housings 7 and 9 respectively, protected from fluid by seals 8. Wafers 5 comprise two conductive metallic essentially flat diaphragms 10 and 11 separated by an annular insulating spacer 12. Diaphragms 10 and 11 are connected to electrical terminals 13 and 14. The lower diaphragms 11 have central bosses 15 for limited contact area. Spring-biased button 16 engages boss 15 from lower housing 7 of the single inlet 17 switch 3. Sealed housings 6 and 9 have bleeder valve screws 18. In valve 3, diaphragm 11 is driven down providing a wiping action.

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Fluidic Switch

Fluidic single inlet and two inlet differential switches 3 and 4 in drawings 1 and 2 respectively include a pressure sensing wafer 5 and a split housing. Upper housings 6 and lower housing 9 have a thin elastomeric film seal 8. Wafers 5 are held between upper housings 6 and lower housings 7 and 9 respectively, protected from fluid by seals 8. Wafers 5 comprise two conductive metallic essentially flat diaphragms 10 and 11 separated by an annular insulating spacer
12. Diaphragms 10 and 11 are connected to electrical terminals 13 and 14. The lower diaphragms 11 have central bosses 15 for limited contact area. Spring- biased button 16 engages boss 15 from lower housing 7 of the single inlet 17 switch 3. Sealed housings 6 and 9 have bleeder valve screws 18. In valve 3, diaphragm 11 is driven down providing a wiping action. Steel diaphragms 10 and 11 are copper plated and have a deposit of gold. A high-stiffness, low-mass wafer 5 has a high natural frequency and very fast speed of response.

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