Browse Prior Art Database

Low Fluid Flow Rate Measuring System

IP.com Disclosure Number: IPCOM000044065D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Johnson, LJ: AUTHOR

Abstract

1 p. The flow rate measuring system described below provides accurate measuring and monitoring of very low fluid flow required for the lubricating process in the manufacture of rigid disks. Using optical sensors which sense the presence or absence of fluid in a glass tube, the flowmeter accurately monitors the amount of lube/FREON* mixture applied to each disk. Presently, 0.3 ML per 15 seconds per glass pipette is used, but lower flow rates can also be measured. With the air off and valve 1 open, fluid flows from the tank, filling pipette 2. When fluid reaches fluid full sensor 3, valve 1 is closed. During the lubricating cycle, air is turned on which siphons fluid from the pipette, creating a fine spray exiting nozzle 5. Fluid flows down graduated pipette 2 until the cycle is completed, at which time the air is turned off.

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Low Fluid Flow Rate Measuring System

1 p. The flow rate measuring system described below provides accurate measuring and monitoring of very low fluid flow required for the lubricating process in the manufacture of rigid disks. Using optical sensors which sense the presence or absence of fluid in a glass tube, the flowmeter accurately monitors the amount of lube/FREON* mixture applied to each disk. Presently, 0.3 ML per 15 seconds per glass pipette is used, but lower flow rates can also be measured. With the air off and valve 1 open, fluid flows from the tank, filling pipette 2. When fluid reaches fluid full sensor 3, valve 1 is closed. During the lubricating cycle, air is turned on which siphons fluid from the pipette, creating a fine spray exiting nozzle 5. Fluid flows down graduated pipette 2 until the cycle is completed, at which time the air is turned off. If the fluid level is not between fluid tolerance sensors 4, a manufacturing controller indicates too little or too much fluid was used. Between disk lubricating cycles valve 1 is again opened, air is off, and pipette 2 refills. Pipette 2 must be at a shallow angle so that fluid height differential between nozzle 5 and low limit fluid in pipette 2 is minimal to assure system accuracy. * Trademark of E. I. du Pont de Nemours & Co.

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