Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Hot Plate Magnetic Stirrer: Ring Heater over a Relay Magnet on a Shielded Spindle (Hug, US 3,028,476)
A laboratory stand that heats a vessel and stirs it at the same time. A motor in the base spins a bar magnet; in Theodore Hug's design (US 3,028,476, 1962) that magnet turns a second, free bar magnet on a spindle inside the hot plate, which in turn spins a coated stirring bar in the vessel.
A stainless-steel radiation shield and an air gap keep the ring heater's heat away from the motor. The relay magnet sits about 1/2 in. under the aluminium heat sink: closer, eddy currents in the sink slow the stirring.
Source: T. Hug, "Hot Plate and Magnetic Stirrer", US Patent 3,028,476 (filed 1960, granted 1962). Picture: its Figs. 1-2.
Juu
Unknown
Maagizo
1
1
Read Hug
Read Hug
"Attempts have been made to couple conventional heating means to magnetic stirrers, but the same have proved to be unsuccessful. Thus, the base of a laboratory vessel must be positioned relatively close to the driving rotating magnet ... Moreover, if an appreciable amount of heat from the heating means is transmitted to the motor of the magnetic stirrer, it will drastically reduce the useful operating life of said motor."
2
2
Build the stirrer base
Build the stirrer base
Make a housing of aluminium (or another non-magnetic material) and mount an electric motor inside with its shaft upright. Fix a permanent bar magnet horizontally on the top of the shaft, just under the housing top. Wire the motor through a rheostat to its cord so the speed can be varied. Sizes, motor rating and how the housing is formed are not given.
Vifaa kwa hatua hii:
Bamba la alumini1 housing
Mota ya umeme1 kipande
Seti ya sumaku za fimbo1 drive magnet
Reostati1 kipande
Waya laini yenye plagi1 kipandeZana zinazohitajika:
Vipimo visivyojulikana
Njia ya kuunda isiyojulikana3
3
Make the radiation shield
Make the radiation shield
Shape a radiation shield of non-magnetic stainless steel so it straddles the top of the housing, on stainless-steel legs (a poor conductor of heat) that stand on the housing top. Bore its centre and fit a threaded spindle there with a nut on each side of the shield. Tap a blind thread in each leg.
Vifaa kwa hatua hii:
Bati la chuma cha pua - 3041 shield and legs
Fimbo yenye nyuzi1 spindle
Nati ya pembe sita2 vipandeZana zinazohitajika:
Mkasi wa bati
Kekee cha Nguzo
Seti ya vichimbuzi
Seti ya kukata nyuzi za skrubuNjia ya kuunda isiyojulikana4
4
Fit the relay magnet
Fit the relay magnet
Bore a blind cavity in a hub of non-magnetic material so it turns freely on the spindle. Lay a permanent bar magnet 1/4 in. by 1 in. by 1 3/4 in. on top of the hub and hold it with a strap screwed to the hub. The hub and strap material is not given.
Vifaa kwa hatua hii:
Seti ya sumaku za fimbo1 relay magnet, 1/4 x 1 x 1 3/4 in.
Nyenzo isiyojulikana1 hub and strap
Skrubu za mashine2 vipandeZana zinazohitajika:
Kereza ya ChumaKekee cha NguzoSeti ya vichimbuziSeti ya kukata nyuzi za skrubu5
5
Mount the supports
Mount the supports
Make three support members of non-magnetic stainless steel, each an upright with flanges. Screw the flanges down into the legs, with small tubular spacers of insulating material round the screws between the shield and the flanges, so air can circulate and carry heat away. Fit a grommet in one support for the heater cord. The spacer material is not given.
Vifaa kwa hatua hii:
Bati la chuma cha pua - 3041 three supportsSkrubu za mashine3 vipande
Kihami kisichojulikana3 tubular spacersZana zinazohitajika:
Mkasi wa batiKekee cha NguzoSeti ya vichimbuzi6
6
Fit the heater and top
Fit the heater and top
Mount an annular ring heater (elements in a non-magnetic sheath) coaxial with the spindle; join its cord wires to its threaded stud between two nuts. Above it lay an aluminium heat sink, a flat plate wider than the heater, so the relay magnet is about 1/2 in. below it. Cover with a top plate of aluminium or stainless steel whose edge is spun into an inverted dish, and screw the edge to the tops of the supports. The patent claims a blackened outer surface on the heat sink and top plate (how is not given). In use, set the hot plate on the stirrer and put a stirring bar (a short bar magnet sealed in glass or coated with PTFE) in the vessel: the drive magnet turns the relay magnet, which turns the bar.
Vifaa kwa hatua hii:
Kipengele cha kupasha joto1 ring heaterWaya laini yenye plagi1 kipandeNati ya pembe sita2 vipande
Bamba la Alumini1 heat sinkBamba la alumini1 top plateSkrubu za mashine3 vipandeZana zinazohitajika:
Kifaa cha kusokota metaliKereza ya ChumaKekee cha NguzoSeti ya vichimbuziVifaa
13- 1 top plateKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 relay magnet, 1/4 x 1 x 1 3/4 in.Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 three supportsKishikilia Nafasi
- 1 spindleKishikilia Nafasi
- 4 vipandeKishikilia Nafasi
- 1 hub and strapKishikilia Nafasi
- 8 vipandeKishikilia Nafasi
- 3 tubular spacersKishikilia Nafasi
- 1 ring heaterKishikilia Nafasi
- 1 heat sinkKishikilia Nafasi
Zana Zinazohitajika
8- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.