فن
خوبصورتی اور تندرستی
دستکاری
ثقافت اور تاریخ
تفریح
ماحول
خوراک اور مشروبات
ریورس انجینئرنگ
سائنسز
کھیل
ٹیکنالوجی
پہننے والے آلات
The Float Switch: A Liquid Level Turned Into a Contact
The float valve shuts off a cistern by itself. A float switch does the same job for an electric circuit: a float rides the liquid, and at a set level it opens or closes a contact — to start a sump pump, stop a tank overfilling, or warn that something has run dry.
George J. Papashvili of Los Angeles applied it to the most expensive thing to run dry. US 1,719,078, *Float Switch*, filed 25 May 1926 and granted 2 July 1929, connects a cylinder to the engine's crankcase so the oil stands at the same level in both. A float on a spring-held rod drops as the oil falls; first it lights a lamp behind a glass marked "No oil", and then, if the driver drives on, it shorts the ignition and stops the engine.
This rung works out a float's lift and why most float switches do not rely on it directly, sizes a sump pump's switching band, and builds a two-level float switch.
نیا سیکھنے والا
About 3 hours
ہدایات
1
1
Buoyancy, and the starts a band allows
Buoyancy, and the starts a band allows
Jupyter نوٹ بک لوڈ ہو رہی ہے…
2
2
Read Papashvili's cut-out
Read Papashvili's cut-out
Fig. 2 of US 1,719,078 shows the indicator in section: cylindrical container 8, cover 10, a rod 12 through the cover with a disc head 13, and compression spring 14 between cover and head holding the rod up. Float 16 slides on the rod above an adjustable collar 15 with a set screw.
When the oil is low, "the float descends on the rod and engages the collar 15, the weight of the float compressing the spring 14" and lowering the head onto plate 20 — grounding the ignition lead to the distributor and stopping the engine. An insulating ring 31 on the head carries a conducting strip 32 that bridges contacts 28 to a lamp 26. The contacts sit higher than the ignition contact, "so that in the descent of the rod … the electric circuit through the signal lamp is established before the ignition circuit is short-circuited": warning first, shutdown second.
3
3
Warning before shutdown
Warning before shutdown
Blockly ورک اسپیس
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4
4
Build a two-level sump switch
Build a two-level sump switch
Cut the top off a 2 L bottle to make the sump. Glue a table-tennis ball to a thin dowel that slides freely in a guide bored through a plywood bridge across the top. Fix two collars (a cable tie pulled tight) on the dowel above the bridge, 60 mm apart.
Mount a lever microswitch on the bridge so the upper collar lifts its lever as the ball rises, and the lower collar pulls it back down as the ball falls — the gap between the collars is the band. Because the ball's lift is small, use the lightest lever switch and a lever long enough to need little force.
Wire the microswitch so it switches the coil of a 12 V relay, and let the relay drive a small submersible pump emptying the bottle into a bucket. Pour water in steadily and count the starts a minute; move the collars closer and count again. Then fit a commercial float switch in its place and compare.
اس مرحلے کے لیے مواد:
PET بوتل (گیس والا مشروب)1 ٹکڑا
میز ٹینس کی گیندیں1 ٹکڑا
سخت لکڑی کی کھونٹیاں1 ٹکڑا
پلائی ووڈ کی چادر1 ٹکڑا
خرد سوئچ (لیور سے چلنے والا)1 ٹکڑا
SPDT ریلے1 ٹکڑا
ڈوبنے والا پانی کا پمپ1 ٹکڑا
فلوٹ سوئچ1 ٹکڑا
پانی5 لیٹردرکار اوزار:
راست رو بجلی کا منبع
بے تار مشق
مشقوں کا سیٹ
گرم گوند کی بندوق
اسٹاپ واچ
پیمائشی جگ5
5
A float switch not switching when it should
A float switch not switching when it should
Float switch faults, from the float up.
Flow
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6
6
History and honest limits
History and honest limits
**George J. Papashvili** of Los Angeles filed **US 1,719,078** on 25 May 1926; granted 2 July 1929. Float-operated contacts had been used before for level indication; his applied the float to protect an engine, with a warning stage before shutdown. Low-oil shutdown switches are still fitted to small engines and generators.
**Honest limits.** A float switch reads the level where the float is: foam, waves and sludge fool it. Its lift is small, so it must move something light. Where a level cut-out protects against harm, a second independent switch is used.
مواد
9- پلیس ہولڈر
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- پلیس ہولڈر
- 1 ٹکڑاپلیس ہولڈر
- 1 ٹکڑاپلیس ہولڈر
- 1 ٹکڑاپلیس ہولڈر
- 5 لیٹرپلیس ہولڈر
درکار اوزار
6- پلیس ہولڈر
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متعلقہ بلیو پرنٹ
یہ بلیو پرنٹ علم بانٹتے ہیں — تکنیک، مواد یا اصول
CC0 پبلک ڈومین
یہ بلیو پرنٹ CC0 کے تحت جاری کیا گیا ہے۔ آپ اجازت لیے بغیر اس کام کو نقل، ترمیم، تقسیم اور کسی بھی مقصد کے لیے استعمال کرنے کے لیے آزاد ہیں۔
میکر کی حمایت کریں ان کے بلیو پرنٹ کے ذریعے پروڈکٹس خرید کر جہاں وہ میکر کمیشن وینڈرز کی طرف سے مقرر، کماتے ہیں، یا اس بلیو پرنٹ کی نئی تکرار بنائیں اور آمدنی شیئر کرنے کے لیے اسے اپنے بلیو پرنٹ میں کنکشن کے طور پر شامل کریں۔