US3779667A - Semi-seal device - Google Patents
Semi-seal device Download PDFInfo
- Publication number
- US3779667A US3779667A US00228945A US3779667DA US3779667A US 3779667 A US3779667 A US 3779667A US 00228945 A US00228945 A US 00228945A US 3779667D A US3779667D A US 3779667DA US 3779667 A US3779667 A US 3779667A
- Authority
- US
- United States
- Prior art keywords
- semi
- impellor
- sealing member
- hub
- seal
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/4472—Labyrinth packings with axial path
- F16J15/4474—Pre-assembled packings
Definitions
- ABSTRACT A semi-seal device for controlling the flow of water along a rotating shaft, which device is annular and contained in a retainer disposed around the shaft. The containment is loose so that the semi-sealing member may move laterally in its retainer thus temporarily increasing the clearance between the semi-sealing member and the rotating shaft.
- the semi-sealing member is deformable and resilient. The lateral movement and deformation properties allow sand or other foreign particles to pass between the semi-sealing member and rotating shaft.
- This invention relates to centrifugal water pumps and in particular to a means for protecting the impellor hub and pump housing against damage from foreign particles.
- a centrifugal water pump includes a rotating impellor which is driven by an external power source and which functions to direct a stream of water through its outlet by creating a centrifugal force.
- the centrifugal force operating on the water in the impellor forces the water out the impellor exit thereby creating a suction at the impellor entrance. This suction then acts to bring water into the impellor thus completing the pumping action.
- the impellor is circular and rotates within a fixed housing which functions to collect the water expelled from the impellor.
- the clearance between the impellor and the housing is such that some of the water expelled from the impellor recircu lates around the exterior of the impellor. That water which circulates on one side of the impellor, for example, may be used to cool the impellor hub ahd then allowed to re-enter the mainstream of water within the impellor. That water which circulates on the other side of the impellor, for example, may flow by the base of the impellor, the impellor hub, and into the body of water from which the pump draws.
- the present invention allows the pump designer to maintain a sufficiently large pump housing to impellor hub tolerance while controlling pump efficiency. In general, this goal is accomplished by interposing a flexible, movable gasket, axially aligned with the impellor hub, which effectively restricts and controls the bypass water flow while allowing foreign particles to pass without incident.
- the invention is most applicable to pumps having a plastic impellor hub and/or plastic housing but will serve the same function and eliminate the same, though not as severe, problems in metal housing and/or metal impellor pumps.
- FIG. 1 is a diametrical vertical section of a centrifugal pump, showing the semi-seal in place;
- FIG. 2 is an enlarged partial vertical section of the semi-seal of FIG. 1 showing the semi-seal and its housing in relation to the centrifugal pump impellor hub and pump housing;
- FIG. 3 is an exploded perspective view of the semiseal assembly.
- FIG. l shows the source of water to be pumped 10
- the pump impellor 12 is driven by a motor 18 through a rotating shaft 20 around which is disposed a water-tight seal 22.
- the heat of friction generated by the shaft 20 rotating within the water-tight seal 22 is dissipated through the heat exchange chamber 24.
- the outside wall of the heat exchange chamber 24 is formed by the upper impellor hub 25 and the lowermost portion of the heat exchange chamber 24 contains outlets 30 connecting it to the interior of the impellor 14.
- the first annular semi-seal or wear ring assembly 32 is attached to the lower portion of a pump housing structural member 52 located immediately adjacent the upper hub impellor 25.
- the second annular semi-seal assembly 32 is attached to a pump housing structural member 54 located adjacent to the lower impellor hub 27. Both semi-seal assemblies are positioned around the impellor hub.
- the semi-seal assembly 32 can best be understood by referring to FIG. 3 which shows the ring shaped semi-sealing member 34, an upper retaining member 42, and a lower retaining member 44.
- These retaining members when assembled, contain the semisealing member 34 in a sandwich configuration.
- Each retaining member has a recessed area 46 such that when the two retaining members are in an assembled configuration the semi-sealing member 34 fits loosely in the recessed area.
- the recessed area is formed by an annular shoulder 47 located at the outer periphery of each of the retaining members 42 and 44. Located on this shoulder 47 are pins 48 and holes suitable for aligning the two retaining members in an assembled configuration.
- the diametric distance between the interior walls of the recess shoulders 47 is greater than the outside diameter D of the semi-sealing member 34.
- the height of the recess shoulder is greater than one half the thickness of the semi-sealing member 34.
- FIG. 2 an enlarged view shows the semi-seal assembly 32 attached to the upper, structure member 52 and adjacent to-the upper impellor hub 25.
- the semisealing member 34 is loosely encased by the upper retaining member 42 and the lower retaining member 44. To the right of the semi-sealing member 34 is located the recess shoulders 47 and the alignment pin 48 and hole 50 in assembled configuration,
- centrifugal pumps are designed with a clearance between the edge of the pump impellor l3 and the edge of the pump housing 15 so that the impellor may rotate freely within its housing. Normally the clearance is such that some water leaving the impellor recirculates through the areas above 26 and below 28 the impellor. That water recirculating above 26 the impellor passes through the heat exchange chamber 24 and then re-enters the interior of the impellor 14 via inlets 30 in its wall.
- any foreign matter, such as sand, in the water may eventually enter the impellor l4 and from there enter the upper 26 and lower 28 recirculation areas. When this occurs, the foreign matter must pass through the narrow strait 56 between the upper impellor hub 25 and the semi-sealing member 34. In order to facilitate passage of the forcing matter, clearances must be kept at an adequate size but at the same time, if clearances are excessive, too much water will recirculate thus lowering the pumps efficiency.
- the present invention solves the above problem by allowing the pump designer to enlarge the recirculation pathway while at the same time controlling the flow of recirculating water.
- the operation of the semi-seal can be best understood by referring to FIG. 2.
- the recirculating water and associated foreign matter flow between the semisealing member 34 and the impellor hub 25.
- each semi-sealing member centers itself around its related hub because of the centrigugal force of the rotating hub and surrounding water.
- the distance 56 between the semi-sealing member 34 and the impellor hub 25 is designed so as to adequately control this flow and may vary from pump to pump. The smaller the clearance the less the flow.
- any foreign matter entering the strait 56 between the impellor hub 25 and the structural member 52 must pass through without becoming lodged in this passage way.
- the narrowest portion of the passage way occurs at the sealing member 34.
- a sand particle for example, begins to be lodged between the semi-sealing member 34 and the hub, the particle is pushed against the semi-sealing member by the rotating hub. This causes the semi-sealing member 34 to move laterally in its retainer 42 and 44 away from the particle so that the semi-sealing member is eccentric to the hub and the clearance 56 adjacent the particle increases. Further, the edge of the semi-sealing member exposed to the flow of water tends to be deformed by the particle.
- a centrifugal water pump including a semi-seal comprising:
- a pump impellor mounted for rotation within said housing and having a circular hub thereon;
- annular semi-sealing member having a slightly large interior diameter than the exterior diameter of said hub and disposed in said chamber in closelyspaced position around said hub for allowing limited flow of water through said chamber through the space defined between inner diameter of the annular semi-sealing member and the hub;
- retaining means on said housing having a recess therein with walls retaining said semi-sealing member in its axial position relative to said hub, said recess being of greater axial length than the axial thickness of said semi-sealing member and of an outer diameter greater than the outer diameter of said semi-sealing member for permitting said semisealing member to move laterally relative to said hub to an eccentric position therewith to permit particles in said water larger in dimension than the difference in radius between the exterior of said hub and the interior of said semi-sealing member to pass between the semi-sealing member and the hub in response to the differential pressure between the intake and discharge of the impellor.
- a centrifugal water pump including a semi-seal as defined in claim 1 and further comprising a second one of said chambers, said semi-sealing members, and said retaining means disposed on the opposite side of said impellor.
- a centrifugal water pump including a semi-seal as defined in claim 2 in which the axis of rotation is substantially vertical, the first chamber is above the impellor, and the second chamber is below the impellor.
- a centrifugal water pump including a semi-seal as defined in claim 1 wherein the water flowing through the chamber is used to cool the impellor shaft.
- a centrifugal water pump including a semi-seal as defined in claim 1 wherein:
- said housing includes an assembly disposed around said hub in spaced relation thereto and having a first member and a second member in juxtaposed relation forming an annular recess for receipt of said semi-sealing member;
- said retaining means is mounted on said housing assembly.
- a centrifugal water pump including a semi-seal as defined in claim 1 wherein said retaining means comprises:
- first and second annular members removably connected together, one of said annular members having a retaining shoulder forming a recess in said connection between said first and second annular members, said recess containing the semi-sealing member, the largest diameter of said recess being substantially greater than the largest diameter of said semi-sealing member, and the height of said recess being slightly greater than the height of said semi-sealing member.
- a centrifugal water pump including a semi-seal as defined in claim 6 and further comprising:
- pins on one of said annular retaining means members and holes in the other of said annular retaining is a resilient ring adapted to be deformed by the passing of the particles to promote movement of said semisealing member to said eccentric position.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims (8)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22894572A | 1972-02-24 | 1972-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3779667A true US3779667A (en) | 1973-12-18 |
Family
ID=22859199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00228945A Expired - Lifetime US3779667A (en) | 1972-02-24 | 1972-02-24 | Semi-seal device |
Country Status (1)
Country | Link |
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US (1) | US3779667A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4018544A (en) * | 1976-02-20 | 1977-04-19 | Hale Fire Pump Company | Centrifugal pump |
US4063846A (en) * | 1974-11-13 | 1977-12-20 | Borg-Warner Corporation | Pump impeller improvement |
US4115029A (en) * | 1973-01-26 | 1978-09-19 | Klein, Schanzlin & Becker Aktiengesellschaft | Centrifugal pump |
FR2396190A1 (en) * | 1977-06-27 | 1979-01-26 | Lucas Industries Ltd | Liq. pump with balanced impeller - having opposed pairs of surfaces to which suction and delivery pressure may be applied |
US4177008A (en) * | 1973-01-26 | 1979-12-04 | Klein, Schanzlin & Becker Aktiengesellschaft | Centrifugal pump |
EP0167837A1 (en) * | 1984-06-07 | 1986-01-15 | LOWARA S.p.A. | Seal device for interposition between a pump body and pump impeller |
US4720238A (en) * | 1986-01-20 | 1988-01-19 | Bergeron, Societe Anonyme | Method of interfacing mechanical and concrete components of a pump comprising a concrete volute, and corresponding pump |
US4867638A (en) * | 1987-03-19 | 1989-09-19 | Albert Handtmann Elteka Gmbh & Co Kg | Split ring seal of a centrifugal pump |
US4909707A (en) * | 1989-02-14 | 1990-03-20 | Itt Corporation | Centrifugal pump and floating casing ring therefor |
US5161939A (en) * | 1991-07-12 | 1992-11-10 | Turbo Concepts, Inc. | Air compression system |
DE4211809A1 (en) * | 1992-04-08 | 1993-10-14 | Klein Schanzlin & Becker Ag | Floating ring seal |
US5803733A (en) * | 1997-05-06 | 1998-09-08 | Linvatec Corporation | Pneumatic surgical handpiece and method |
EP0905381A1 (en) * | 1997-09-30 | 1999-03-31 | Ebara Corporation | Centrifugal pump |
US5971704A (en) * | 1997-04-23 | 1999-10-26 | Toyo Pumps North America Corporation | Device for adjusting the running clearance of an impeller |
US6439843B1 (en) * | 2000-11-16 | 2002-08-27 | Ametek, Inc. | Motor/fan assembly having a radial diffuser bypass |
EP1757815A2 (en) | 2005-08-25 | 2007-02-28 | Matsushita Electric Works, Ltd | Cooling pump |
US20070080503A1 (en) * | 2003-11-05 | 2007-04-12 | Arai Seisakusho Co., Ltd. | Sealing device |
WO2008083913A1 (en) * | 2007-01-10 | 2008-07-17 | Continental Automotive Gmbh | Centrifugal pump comprising an impeller that is rotatably mounted in a housing |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE302991C (en) * | ||||
US1715944A (en) * | 1921-07-12 | 1929-06-04 | Oliver Sherwood Co | Elastic seal |
US2034790A (en) * | 1933-04-24 | 1936-03-24 | Reda Pump Company | Pipe line pump unit |
GB819082A (en) * | 1955-10-24 | 1959-08-26 | Alfred Berger | Packing for axles, shafts, rods, bearings and similar machine parts |
US3707335A (en) * | 1971-01-25 | 1972-12-26 | Whirlpool Co | Water pump |
-
1972
- 1972-02-24 US US00228945A patent/US3779667A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE302991C (en) * | ||||
US1715944A (en) * | 1921-07-12 | 1929-06-04 | Oliver Sherwood Co | Elastic seal |
US2034790A (en) * | 1933-04-24 | 1936-03-24 | Reda Pump Company | Pipe line pump unit |
GB819082A (en) * | 1955-10-24 | 1959-08-26 | Alfred Berger | Packing for axles, shafts, rods, bearings and similar machine parts |
US3707335A (en) * | 1971-01-25 | 1972-12-26 | Whirlpool Co | Water pump |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4115029A (en) * | 1973-01-26 | 1978-09-19 | Klein, Schanzlin & Becker Aktiengesellschaft | Centrifugal pump |
US4177008A (en) * | 1973-01-26 | 1979-12-04 | Klein, Schanzlin & Becker Aktiengesellschaft | Centrifugal pump |
US4063846A (en) * | 1974-11-13 | 1977-12-20 | Borg-Warner Corporation | Pump impeller improvement |
US4018544A (en) * | 1976-02-20 | 1977-04-19 | Hale Fire Pump Company | Centrifugal pump |
FR2396190A1 (en) * | 1977-06-27 | 1979-01-26 | Lucas Industries Ltd | Liq. pump with balanced impeller - having opposed pairs of surfaces to which suction and delivery pressure may be applied |
EP0167837A1 (en) * | 1984-06-07 | 1986-01-15 | LOWARA S.p.A. | Seal device for interposition between a pump body and pump impeller |
US4720238A (en) * | 1986-01-20 | 1988-01-19 | Bergeron, Societe Anonyme | Method of interfacing mechanical and concrete components of a pump comprising a concrete volute, and corresponding pump |
US4867638A (en) * | 1987-03-19 | 1989-09-19 | Albert Handtmann Elteka Gmbh & Co Kg | Split ring seal of a centrifugal pump |
US4909707A (en) * | 1989-02-14 | 1990-03-20 | Itt Corporation | Centrifugal pump and floating casing ring therefor |
US5161939A (en) * | 1991-07-12 | 1992-11-10 | Turbo Concepts, Inc. | Air compression system |
DE4211809A1 (en) * | 1992-04-08 | 1993-10-14 | Klein Schanzlin & Becker Ag | Floating ring seal |
US5971704A (en) * | 1997-04-23 | 1999-10-26 | Toyo Pumps North America Corporation | Device for adjusting the running clearance of an impeller |
US5803733A (en) * | 1997-05-06 | 1998-09-08 | Linvatec Corporation | Pneumatic surgical handpiece and method |
EP0905381A1 (en) * | 1997-09-30 | 1999-03-31 | Ebara Corporation | Centrifugal pump |
US6082964A (en) * | 1997-09-30 | 2000-07-04 | Ebara Corporation | Centrifugal pump having a floating seal ring |
US6439843B1 (en) * | 2000-11-16 | 2002-08-27 | Ametek, Inc. | Motor/fan assembly having a radial diffuser bypass |
US6695580B2 (en) | 2000-11-16 | 2004-02-24 | Ametek, Inc. | Motor/fan assembly having a radial diffuser bypass |
US20070080503A1 (en) * | 2003-11-05 | 2007-04-12 | Arai Seisakusho Co., Ltd. | Sealing device |
EP1757815A2 (en) | 2005-08-25 | 2007-02-28 | Matsushita Electric Works, Ltd | Cooling pump |
US20070048148A1 (en) * | 2005-08-25 | 2007-03-01 | Matsushita Electric Works, Ltd. | Pump and liquid supply apparatus having the pump |
US7690886B2 (en) * | 2005-08-25 | 2010-04-06 | Panasonic Electric Works Co., Ltd. | Pump and liquid supply apparatus having the pump |
EP1757815A3 (en) * | 2005-08-25 | 2010-06-09 | Panasonic Electric Works Co., Ltd. | Cooling pump |
CN1920307B (en) * | 2005-08-25 | 2011-08-03 | 松下电工株式会社 | Pump and liquid supply apparatus having the pump |
WO2008083913A1 (en) * | 2007-01-10 | 2008-07-17 | Continental Automotive Gmbh | Centrifugal pump comprising an impeller that is rotatably mounted in a housing |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TOLO INCORPORATED, A CORP. OF CA, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BAKER-HYDRO INCORPORATED;REEL/FRAME:005006/0695 Effective date: 19861001 Owner name: BAKER-HYDRO INCORPORATED, A CORP. OF PA, PENNSYLVA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TOLO INCORPORATED;REEL/FRAME:005006/0697 Effective date: 19881101 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON, THE, MASSACHUSETTS Free format text: SECURITY INTEREST;ASSIGNOR:BAKER-HYDRO INCORPORATED;REEL/FRAME:005075/0632 Effective date: 19880923 |
|
AS | Assignment |
Owner name: BAKER-HYDRO INCORPORATED, R.D. #5, BOARD ROAD, BOX Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST NATIONAL BANK OF BOSTON, THE;REEL/FRAME:005617/0047 Effective date: 19901130 |