power5

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 ...
View Full Document

Ask a homework question - tutors are online