power5 - Double Acting Engine u Steam DOUBLE ACTING ENGINE...

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Unformatted text preview: Double Acting Engine u Steam DOUBLE ACTING ENGINE Steam Inlet Mechanism u Large Inlet Mechanism & Distribution Device u Experiments by Other Inventors u Principle of Double Acting u Planet Gear & Parallel Motion u Cutoff Valve & Governor u Industrial Uses of Steam u Summary - Development of Engine Inlet Mechanism - Single Acting Engine Engine of Watt Used Condenser t For Cost Reasons t Steam Entered Steam-Jacket t Entered and Evacuated at Bottom t Exited Towards Condenser t Condenser Connected to Suction Pump Steam Distribution Device u Watt Steam Distribution - Watt (1778) (1778) t Steam Enters Cylinder at Bottom - Piston Rises t Steam Evacuated To Condenser - Piston Lowers t Newcomen (7 psi ), Watt (10 psi ) psi), psi) u Watt (1780) t Led to Double Acting - Reversed Operation t Constant Steam Pressure Under Piston t Alternating Pressure & Vacuum Above Piston t Did Not Change Operating Principle w t Not Satisfactory - Led to Double Acting 1 Steam Distribution - Watt (1780) Experiments by Other Inventors u Jacob Leopold (1724) t Two Newcomen -Type Cylinders Newcomen-Type t Four-Way Cock t Steam Pressure Higher Than Atmospheric u Jonathan Hull (1736) t Paddle Wheel in Continuous Motion t Ratchet Mechanism t Opposite Direction With Counter Weight Experiments by Other Inventors (continued) u Continuous Atmospheric Engine - Leopold (1724) Movement (competing with Watt) t Keane Fitzgerald (1759) t John Stewart (1777) t Matthew Washborough (1779) t James Pickard (1780) t Thompson (1793) & Sherrats (1794) w u E. Cartwright (1797) t Closed Circuit t Two Gears - Flywheel Atmospheric Engine - Hull (1736) Rotary Engine - Cartwright (1797) 2 Planet Gear & Parallel Motion u Planet Planet Gear - Watt (1781) Gear - Watt (1781) t Crankshaft & Connecting Rod w w t Epicyclic Gear Train w u Parallel Motion - Watt (1784) t Tried Rack & Pinion t Chains Previously t “O” is Center of Beam t “A” is Fixed t “B” & “C” are Attached to Piston Rods Parallel Motion - Watt (1784) Cutoff Valve u Previously Steam Pressure Was Used Throughout The Stroke u Watt (1769) t Stop Supply Of Steam Before End Of Stoke t Utilize Steam Expansion For Last Portion Of Stroke t Absorbed Shock of Piston At End Of Stroke t Total Power of Engine Decreased t Economy Of Steam To Produce Same Work A u Patent Governor u Last - Watt (1782) Governor With Fly-Balls (1784) Of Watt’s Great Inventions Governor u Speed t Limited Opening Of Valves t Controlled Steam Flow t Slowed Down Engine u No Patent - Used In A More Primitive Form In Grain Mills 3 Industrial Uses of Steam u Boulton Double Acting Rotative Engine Boulton & Watt (1787 - 1800) & Watt (1773 - 1800) t Soho Factory - Built 500 Engines t 1/3 Were Pumping Engines t 2/3 Were Double Acting t Averaged 15 hp t After 1800 Watt’s Patents Went Public u Great Britain & Ireland (1817) t 20,000 hp In Cotton Mills u Glasgow (1825) t 310 Steam Engines Summary of Development of Steam Engine Papin (1690) u Papin (1690) u Savery (1698) u Newcomen u Watt - Condenser (1769) u Watt - Double Acting (1784) u Woolf - Double Expansion (1803) Savery (1698) Newcomen 4 Watt (1769) Watt (1784) Woolf (1803) 5 ...
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