US3791782A - Rotary pumps - Google Patents

Rotary pumps Download PDF

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Publication number
US3791782A
US3791782A US00308821A US3791782DA US3791782A US 3791782 A US3791782 A US 3791782A US 00308821 A US00308821 A US 00308821A US 3791782D A US3791782D A US 3791782DA US 3791782 A US3791782 A US 3791782A
Authority
US
United States
Prior art keywords
blade
pump
slots
rotor
worn
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 - Lifetime
Application number
US00308821A
Other languages
English (en)
Inventor
R Horne
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.)
Lacy Hulbert and Co Ltd
Original Assignee
Lacy Hulbert 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 Lacy Hulbert and Co Ltd filed Critical Lacy Hulbert and Co Ltd
Application granted granted Critical
Publication of US3791782A publication Critical patent/US3791782A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders

Definitions

  • ABSTRACT [30] Foreign Application Priority Data A pump of the eccentric rotor offset sliding blade type Dec. 20, 1971 Great Britain 58,992/71 ha th blad slots of such depth, in relation to the I length of blades approaching the fully worn condition, UeS- Cle that upon re.. ta -ting after stoppage worn blades rc Int. main retracted in their lots and -cannot esca e to [58] Field Of Search 418/115, 151, 234, 236, 237, ause jamming and damage to the pump.
  • Offset blade pumps are very reliable in use, but, in
  • an intermittently operated eccentric rotor offset sliding blade type pump having blade slots whose depth is chosen in relation to fully worn blade length such that the centre of gravity of a fully retracted worn blade lies behind the radius of the rotor intersecting its guide slot at right angles.
  • Blades become fully retracted in their slots when the pump rotor is slowed down and stopped and are thrown out by centrifugal force to contact the inner surface of the stator upon re-starting, so long as their centres of gravity lie ahead of the aforementioned radii.
  • Blade slots of pumps in accordance with the invention are abnormally deep, and experience shows that no more than three can be provided in a small rotor without fear of introducing weakness where the base of one slot approaches the side of an adjacent slot.
  • Blade slots of pumps in accordance with the invention are abnormally deep, and experience shows that no more than three can be provided in a small rotor without fear of introducing weakness where the base of one slot approaches the side of an adjacent slot.
  • a fully worn blade D is shown in its extended position in contact with the stator wall. About half its length extends out of its guide slots and it can operate safely in this condition.
  • the blade, referenced D1 is also shown in its fully retracted position, which it assumes when the rotor is stopped, and it can be seen that its centre of gravity X lies behind the radius R from-the rotor axis which intersects the guide slots at right angles.
  • the principle of the invention is certainly applicable j sliding blade pump wherein guide slots for the blades are of such depth that the centre of gravity of a fully retracted blade when worn to the maximum allowable extent lies behind the radius of the rotor which intersects its guide slot at right angles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00308821A 1971-12-20 1972-11-22 Rotary pumps Expired - Lifetime US3791782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5899271 1971-12-20

Publications (1)

Publication Number Publication Date
US3791782A true US3791782A (en) 1974-02-12

Family

ID=10482847

Family Applications (1)

Application Number Title Priority Date Filing Date
US00308821A Expired - Lifetime US3791782A (en) 1971-12-20 1972-11-22 Rotary pumps

Country Status (6)

Country Link
US (1) US3791782A (de)
JP (1) JPS5216804B2 (de)
CH (1) CH552753A (de)
DE (1) DE2261898A1 (de)
GB (1) GB1350417A (de)
NL (1) NL7216983A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1126870C (zh) * 1998-06-29 2003-11-05 张金生 一种旋转活塞泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808208A1 (de) * 1978-02-25 1979-08-30 Bosch Gmbh Robert Rotierende verdraengerpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674953A (en) * 1950-03-18 1954-04-13 Lyall T Conde Rotary pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674953A (en) * 1950-03-18 1954-04-13 Lyall T Conde Rotary pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1126870C (zh) * 1998-06-29 2003-11-05 张金生 一种旋转活塞泵

Also Published As

Publication number Publication date
CH552753A (de) 1974-08-15
NL7216983A (de) 1973-06-22
DE2261898A1 (de) 1973-06-28
GB1350417A (en) 1974-04-18
JPS5216804B2 (de) 1977-05-11
JPS4869104A (de) 1973-09-20

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