US3191540A - Arrangement for equalization and reduction of the pressure upon a stuffing box for apump - Google Patents

Arrangement for equalization and reduction of the pressure upon a stuffing box for apump Download PDF

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Publication number
US3191540A
US3191540A US313840A US31384063A US3191540A US 3191540 A US3191540 A US 3191540A US 313840 A US313840 A US 313840A US 31384063 A US31384063 A US 31384063A US 3191540 A US3191540 A US 3191540A
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United States
Prior art keywords
pressure
pump
groove
rotor
stuffing box
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Expired - Lifetime
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US313840A
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English (en)
Inventor
Skretting Arne
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Metso Fiber Karlstad AB
Original Assignee
Kamyr AB
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Publication date
Application filed by Kamyr AB filed Critical Kamyr AB
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/123—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth

Definitions

  • the invention relates to an arrangement for equalization and reduction of the pressure upon a stuffing box for the shaft of a rotor of a pump, particularly a pump adapted for the pumping of stuff of a high viscosity or consistency, such as fibrous suspensions, and in which the rotor is subjected to different pressures on opposite sides of its shaft.
  • the stuffing box for the rotor shaft projecting through the pump casing is influenced by a pressure which is unevenly distributed over the circumference thereof, a condition which has proved to give rise to rapid Wear and leakage.
  • the object of the invention is to eliminate said drawback and to equalize the pressure upon the stuffing box over its circumference and simultaneously to reduce said pressure to the lowest pressure present in the pump.
  • said object is attained essentially thereby that in the wall of the pump casing there is a groove extending all around the shaft, which groove on the high-pressure side of the pump is covered by the plane end face of the rotor moving closely adjacent to said wall and which groove on the low-pressure side is widened so as to extend beyond said end face, whereby the pressure prevailing on said last-mentioned side gets free access to the groove and can spread thereinto.
  • a projection may be provided on the rotor or its shaft, which projection with a suitable clearance fits to the narrowest cross-section of the groove.
  • FIG. 1 is a vertical cross-sectional view of a pump equipped with the arrangement according to the invention
  • FIG. 2 is a horizontal cross-sectional view of one end of the pump
  • FIG. 3 is a part of FIG. 2 shown on an enlarged scale.
  • the pump shown in the drawing is of the cog wheel type and comprises two rotors 11 and 13 which are arranged parallelly and adjacent to each other and are inserted into a pump casing between the inletside 17 thereof where a low pressure prevails, and its outlet side 19 where a higher pressure prevails in operation due to the action of the pump.
  • the rotors are shaped with projectthe cylindrical wall of the housing, whereas the same number of batches, but each of a considerably smaller content, are carried back through compartments successively formed between the rotors.
  • the casing 15 has interior plane side walls 27, and the rotors have corresponding plane end faces 29 moving along said walls as closely as possible thereto. At either end the rotors are provided with a shaft stud 31 extending through a corresponding aperture in the wall and being journalled, eg by means of a ball bearing 33, in a bearing bracket or similar attached to the pump casing. Keyed to one end of either rotor is a gear wheel 35 for driving the rotors.
  • a groove 47 is provided in the Wall 27 in the immediate vicinity of the bore therein for the shaft stud.
  • said groove which preferably is of a rectangular crosssection, is so narrow measured in the radial direction of the rotor that it is covered by the end face 29 of the rotor.
  • the clearance 49 between the faces 27 and 29 is too slight ing cams or knives 21 each cooperating with a pertaining flute-like depression 23 in the face of the opposite rotor in such a manner that a seal is maintained between the rotors during their rotation.
  • the cams 21 also cooperate with cylindrically curved walls of the pump casing in such a manner that a seal is maintained between the highpressure side and the low-pressure side of the pump on the far sides of the rotors.
  • the groove is widened to such an extent that great parts thereof are not covered by the end face 29 of the rotor, the pressure prevailing on the low-pressure side of the pump having access to the groove. Said pressure propagates into the narrow part of the groove on the high-pressure side of the pump, so that the pressure everywhere in the groove is the same and equal to the lowest pressure present in the pump. In this manner, the pressure upon the stuffing box 39 is considerably reduced and besides, said pressure is equal all around the circumference.
  • the measure of the groove in the axial direction of the rotor is uniform.
  • a die, boss or similar projection 51 Arranged in the angle between the shaft stud 31 and the plane end face 29 is a die, boss or similar projection 51 which is shaped to fit into the narrowest part of the groove 47 with a suitable clearance.
  • the die may be integral with the rotor or may be manufactured separately and attached, e.g. welded, to the rotor or its shaft stud. During each revolution of the rotor said die moves through the narrow part of the groove and removes fibres which may have escaped thereinto. In this manner the groove will always be held open all around and the pressure equalization maintained.
  • Means for the equalization and reduction of the pressure upon a stuffing box for the shaft of a rotor of a pump, particularly a pump adapted for pumping of fibrous sus pensions, and in which the rotor is subjected to different pressures on opposite sides of its shaft, comprising a groove in the Wall of the pump casing and encircling said shaft, the groove on the high-pressure side of said rotor being A.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
US313840A 1962-10-06 1963-10-04 Arrangement for equalization and reduction of the pressure upon a stuffing box for apump Expired - Lifetime US3191540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1073062 1962-10-06

Publications (1)

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US3191540A true US3191540A (en) 1965-06-29

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Family Applications (1)

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US313840A Expired - Lifetime US3191540A (en) 1962-10-06 1963-10-04 Arrangement for equalization and reduction of the pressure upon a stuffing box for apump

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US (1) US3191540A (en:Method)
FI (1) FI41235B (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296974A (en) * 1964-07-16 1967-01-10 Sunds Verkst Er Aktiebolag Means for reducing pressure in packing boxes of pumps
US4439120A (en) * 1980-10-27 1984-03-27 Skega Ab Meshing cog-wheel injection unit with lateral sealing and scropers
US6068757A (en) * 1995-11-03 2000-05-30 Coastal Eagle Point Oil Company Hydrodewaxing process
US20080087004A1 (en) * 2006-09-05 2008-04-17 Terry Michael Van Blaricom Open-cycle internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1252160A (en) * 1917-03-28 1918-01-01 Theodore J Pagel Rotary pump.
US1271968A (en) * 1915-03-15 1918-07-09 Garfield A Wood Gear-pump.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1271968A (en) * 1915-03-15 1918-07-09 Garfield A Wood Gear-pump.
US1252160A (en) * 1917-03-28 1918-01-01 Theodore J Pagel Rotary pump.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296974A (en) * 1964-07-16 1967-01-10 Sunds Verkst Er Aktiebolag Means for reducing pressure in packing boxes of pumps
US4439120A (en) * 1980-10-27 1984-03-27 Skega Ab Meshing cog-wheel injection unit with lateral sealing and scropers
US6068757A (en) * 1995-11-03 2000-05-30 Coastal Eagle Point Oil Company Hydrodewaxing process
US20080087004A1 (en) * 2006-09-05 2008-04-17 Terry Michael Van Blaricom Open-cycle internal combustion engine
US8181624B2 (en) * 2006-09-05 2012-05-22 Terry Michael Van Blaricom Open-cycle internal combustion engine
USRE45397E1 (en) * 2006-09-05 2015-03-03 Terry Michael Van Blaricom Open-cycle internal combustion engine

Also Published As

Publication number Publication date
FI41235B (en:Method) 1969-06-02

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