Browse Prior Art Database

Gas Bubble Agitator Mixer

IP.com Disclosure Number: IPCOM000085815D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 4 page(s) / 48K

Publishing Venue

IBM

Related People

Mulzet, AP: AUTHOR [+3]

Abstract

This device causes gas, e.g., air, bubbles to be emitted from end 1 of noncorrosive tube 2, e.g., TEFLON*. The bubbles, when tube 2 is immersed in a solution, cause agitation action that mixes the solution's ingredients. The device is part of a computer controlled automated chemical analyzer, not shown, in which test tubes containing solution samples of a test specimen and reagent to be analyzed are sequentially fed to the device for mixing prior to analysis.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 40% of the total text.

Page 1 of 4

Gas Bubble Agitator Mixer

This device causes gas, e.g., air, bubbles to be emitted from end 1 of noncorrosive tube 2, e.g., TEFLON*. The bubbles, when tube 2 is immersed in a solution, cause agitation action that mixes the solution's ingredients. The device is part of a computer controlled automated chemical analyzer, not shown, in which test tubes containing solution samples of a test specimen and reagent to be analyzed are sequentially fed to the device for mixing prior to analysis.

Special plug 3 is mounted in end 1 and has two small diameter downwardly inclined discharge holes, not shown. Upper end 4 of tube 2 is connected to a TEFLON hose 5 which conveys gas to tube 2 from a compressor or other gas supply, not shown, through flow control valve 6.

Tube 2 is mounted on a pivotable platform 7, Fig. 1, that positions tube 2 to the two X coordinates X1, X2, Fig. 2. Tube 2 is raised and lowered by a double- acting air cylinder 8 via its piston or rod 8a at each of the coordinates X1, X2. Cylinder 8 is controlled by four-way solenoid valve 9. The aforementioned gas supply is connected through tee fitting 10 directly to valve 6 for air mixing, but is connected to valve 9 through check valve 11. Check valve 11 maintains a positive pressure which holds tube 2 in an up position, even if the air supply is turned off, and thus prevents tube 2 from dropping during a power or air supply failure.

The rate of raising or lowering tube 2 is controlled by adjusting flow control valve 12 at cylinder exhaust port 13 of valve 9.

Tube 2 has a self-adjusting depth control to accommodate for different size lengths of test tubes. For this purpose, tube 2 is mounted in a TEFLON sleeve bushing 14 which is affixed to platform 7 and permits freedom of movement of platform 7 in a vertical direction. Thus, if a short test tube is used, tube 2 stops when the bottom of end 1 touches the inner bottom of the test tube. However, rod 8a and, hence, platform 7 are allowed to continue moving downward by bushing 14 until the lower limit of a proximity sensor switch HC1 is actuated. This eliminates the need for logic circuitry and plumbing that otherwise would be required to stop rod 8a at various positions to accommodate different test tube lengths. It also insures that mixing occurs at the very bottom of the test tube.

With tube 2 in its home position HOME and coincident with coordinate X1, it is directly above the particular test tube, not shown, that has been automatically indexed to the mixer station which is coincident with coordinate X1. To begin the mixer mode or phase of the operational cycle, valve 9 is actuated causing rod 8a to move downward and, hence, tube 2 to be lowered into the solution of the test tube at the same time the air supply to tube 2 is turned on. As tube 2 lowers gas flows and/or bubbles through the solution and thereby effectively mixes the solution.

When the lower or STOP position is reached by platform 7, Hall sensor switch HC1 is activ...