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FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Stirrer: Magnetic Stirrer, a Turning Horseshoe Magnet under a Free Magnet Rod (Rosinger, US 2,350,534, 1944)
The magnetic stirrer of the chemistry lab. A small motor in a box spins a horseshoe magnet just under the thin lid. A little magnet rod sealed in an inert shell lies loose in the flask on top and spins with it, stirring the liquid into a deep vortex with nothing poking through the neck, so the flask can stay closed, under pressure or vacuum.
Result: a stirrer for laboratory liquids, speed set by a rheostat.
Source: A. Rosinger, US 2,350,534 (1944). Unknown: sizes, the motor and the magnet alloys. Picture: the patent drawing.
Miðlungs
Unknown
Leiðbeiningar
1
1
Build the box
Build the box
Make a box with a bottom, side walls and a removable top, all of non-magnetic material. Make the top as thin as you can. Not given: the material, sizes.
Efni fyrir þetta skref:
Óþekktur efniviður1 non-magnetic boxNauðsynleg verkfæri:
Óþekkt mál2
2
Mount the motor and magnet
Mount the motor and magnet
Fix an electric motor in the middle of the box with its shaft upright, held by bands round its housing whose arms are screwed to the side walls. Fix a strong horseshoe permanent magnet on the shaft, poles up, so its pole faces turn as close under the thin top as possible. Not given: the motor, the magnet alloy.
Efni fyrir þetta skref:
Rafmótor1 stykki
Óþekktur málmur1 bands and arms
Skeifusegull1 stykkiNauðsynleg verkfæri:
Skrúfjárnasett3
3
Wire the speed control
Wire the speed control
Lead the motor wires out of the box through a regulating rheostat and a switch to a cord with a plug. The rheostat sets the motor speed, and so the stirring speed.
Efni fyrir þetta skref:
Stilliviðnám1 stykki
Stangarrofi1 stykki
Sveigjanleg snúra með kló1 stykkiNauðsynleg verkfæri:
Skrúfjárnasett4
4
Make the stirring rod
Make the stirring rod
Take a small round permanent magnet rod, shorter than the width of the flask's bottom, and seal it in a thin shell of an inert material (porcelain, glass, Bakelite or a suitable plastic) so it cannot affect the liquid. Where bare iron or steel would do no harm, the shell may be left off. Ours: a sealed glass tube for the shell.
Efni fyrir þetta skref:
Stangarseglasett1 rod magnet
Glerrör1 shellNauðsynleg verkfæri:
Bunsenbrennari5
5
Stir
Stir
Stand a non-magnetic flask or beaker of the liquid on the box and drop in the rod. Switch on and set the speed: the rod follows the turning magnet and whips the liquid into a deep vortex. Set the rod off-centre and it both spins and travels round the bottom, stirring faster still. The vessel can be closed, since no shaft goes in.
Nauðsynleg verkfæri:
GlerbikarEfni
9- 1 non-magnetic boxStaðgengill
- 1 stykkiStaðgengill
- 1 bands and armsStaðgengill
- 1 stykkiStaðgengill
- 1 stykkiStaðgengill
- frá$3.53
- 1 stykkiStaðgengill
- 1 rod magnetStaðgengill
- 1 shellStaðgengill
Nauðsynleg verkfæri
4- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
Þessi teikning býr til
CC0 opinbert ríki
Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.
Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.