GB742507A - Improvements in or relating to air-powered hydraulic pumps - Google Patents

Improvements in or relating to air-powered hydraulic pumps

Info

Publication number
GB742507A
GB742507A GB1819053A GB1819053A GB742507A GB 742507 A GB742507 A GB 742507A GB 1819053 A GB1819053 A GB 1819053A GB 1819053 A GB1819053 A GB 1819053A GB 742507 A GB742507 A GB 742507A
Authority
GB
United Kingdom
Prior art keywords
cylinder
piston
main
compressed air
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1819053A
Inventor
Kenneth Ord Mackenzie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHARLES S MADAN AND CO Ltd
Original Assignee
CHARLES S MADAN AND CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHARLES S MADAN AND CO Ltd filed Critical CHARLES S MADAN AND CO Ltd
Priority to GB1819053A priority Critical patent/GB742507A/en
Publication of GB742507A publication Critical patent/GB742507A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/03—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with movement in two directions being obtained by two single-acting piston liquid engines, each acting in one direction
    • F03C1/035—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with movement in two directions being obtained by two single-acting piston liquid engines, each acting in one direction one single-acting piston being always under the influence of the liquid under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L23/00—Valves controlled by impact by piston, e.g. in free-piston machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/123—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber
    • F04B9/1235—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber the movement of the pump piston in the two directions being obtained by two single-acting piston fluid motors, each acting in one direction

Abstract

742,507. Compressed air engines; valve gear. MADAN & CO., Ltd., C. S. May 20, 1954 [July 1, 1953], No. 18190/53. Classes 122(2) and 122(3) [Also in Group XXVIII] A reciprocating pump for liquids is actuated by a compressed air engine comprising mechanically coupled oppositely acting main and return pistons 13, 30 and cylinders 10, 26, the return piston 30 being of smaller area than the main piston 13, means for supplying compressed air to the operative end of the return cylinder 26 which communicates through a restricted air duct with the operative end of the main cylinder 10, and an exhaust valve 35 in the main cylinder actuated by reciprocating parts of the engine. The pistons are coupled by a common piston rod 29 that passes with a small clearance through a bore 24 in a boss 23 on the main cylinder cover 12 to which the cylinder 26 is connected and is provided with a compressed air inlet 28 communicating both with the bore 24 and the cylinder 26. An extension 31 of the rod 29 extends through the open end of the return cylinder 26 and supports a cup 32 having a flange 33 adapted to contact a spring 38 on the stem 36 of the exhaust valve 35. The space under the main piston 13 is vented through a hole 39 and the lower end 11 of the cylinder 10 is formed as a pump block having a bore 15 in which a piston 14, attached to the piston 13. operates; spring-loaded ball valves 19, 20 being provided in the inlet and delivery passages 17. 18. In operation, compressed air supplied at the inlet 28 enters both cylinders and moves the pistons downwards until the flange 33 opens the exhaust valve 35 to release the pressure above the main.piston 13 and, since the clearance in bore 24 allows only a restricted flow of air, the pressure on the piston 30 returns the pistons until the piston 13 contacts and closes the exhaust valve 35 and the cycle recommences. To increase the speed of the downward stroke of the pistons a differential pressure valve (not shown), may be provided which opens to supply compressed air into the cylinder 10, when the air passing through the clearance in bore 24 has built up sufficient pressure in the cylinder 10 and automatically closes when the exhaust valve 35 is unseated.
GB1819053A 1953-07-01 1953-07-01 Improvements in or relating to air-powered hydraulic pumps Expired GB742507A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1819053A GB742507A (en) 1953-07-01 1953-07-01 Improvements in or relating to air-powered hydraulic pumps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1819053A GB742507A (en) 1953-07-01 1953-07-01 Improvements in or relating to air-powered hydraulic pumps

Publications (1)

Publication Number Publication Date
GB742507A true GB742507A (en) 1955-12-30

Family

ID=10108201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1819053A Expired GB742507A (en) 1953-07-01 1953-07-01 Improvements in or relating to air-powered hydraulic pumps

Country Status (1)

Country Link
GB (1) GB742507A (en)

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