US20110002769A1 - Centrifugal pump for de-watering - Google Patents
Centrifugal pump for de-watering Download PDFInfo
- Publication number
- US20110002769A1 US20110002769A1 US12/497,190 US49719009A US2011002769A1 US 20110002769 A1 US20110002769 A1 US 20110002769A1 US 49719009 A US49719009 A US 49719009A US 2011002769 A1 US2011002769 A1 US 2011002769A1
- Authority
- US
- United States
- Prior art keywords
- pump
- impeller
- seal
- inlet port
- liquid
- 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.)
- Abandoned
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims 1
- 238000013021 overheating Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract 2
- 230000037452 priming Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Images
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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
Definitions
- This invention relates to centrifugal pumps, and more particularly the use of self-priming centrifugal pumps for de-watering scenarios.
- Centrifugal pumps have high capacity, measured in gallons per hour (gph), are readily available, and are generally inexpensive. They are, however, unsuitable for de-watering because de-watering requires intermittent to extended periods of dry operation.
- An example of a de-watering scenario is the draining of a thin mud slurry sloughed onto a recovery mat while washing trucks, or other vehicles.
- Reciprocating diaphragm pumps can be operated dry and are suitable for dewatering. They have low capacity, however, and can be quite expensive. Compared to the least expensive diaphragm pump, a centrifugal pump could cost 70%-80% less while having twice the head and nearly four times the capacity for throughput.
- the impeller of a centrifugal pump has a shaft which extends through a housing to an external motor.
- the housing which is a chamber containing the volute, is rendered water-tight by means of a seal surrounding the shaft, or the bearing in which the shaft is situated.
- the seal can be degraded by the heat of friction, which is normally dissipated by the circulation of fluid through the chamber.
- the seal can be quickly destroyed, however, during a period of dry running, such as may occur when water is draining from a slurry into a pool which is periodically pumped dry.
- U.S. Pat. No. 5,667,357 to Buse et al discloses a system for providing a flow of water to the bearing seal during intermittent periods of dry running.
- the water is recycled from a reservoir connected to the output port of the pump.
- the reservoir is effectively a bulge in an ascending pipe which retains a body of water therein.
- the pressure gradient, or head, caused by the rotating impeller, drives a recirculation current from the body of water through a pre-existing channel system, designed to externally irrigate the bearing casing, back to the volute chamber.
- U.S. Pat. No. 4,773,823 to Pease teaches a similar system, except that the object in this case is to increase the life of the seal rather than to sustain dry running periods.
- the re-circulated water is drawn not from a reservoir, but directly from the volute. Since there is always a torus of water in the volute, even during dry running, conceptually there is a supply, at least for short periods, for continuous recirculation.
- a method of dewatering an intermittently dry pool comprising the steps of providing a self-priming centrifugal pump having inlet and discharge ports and an impeller; connecting the impeller to an engine through a shaft fitted with a seal providing water-tight isolation, the impeller creating a head manifest as suction in the inlet port; establishing fluid communication between the inlet port and the pool; and introducing a means for continuously cooling the shaft seal without occluding the suction, whereby degradation of the seal by heat of friction is avoided.
- the means for continuously cooling is provided by a pressurized source of liquid introduced to the inlet port at a fraction of the pump capacity, the liquid streaming continuously regardless of dry or wet operation.
- the liquid is water under line pressure.
- FIG. 1 is a perspective view of the invention, illustrating a centrifugal pump connected to a source of streaming water;
- FIG. 2 is a partial exploded view of the centrifugal pump of FIG. 1 in perspective
- FIG. 3 is a process diagram following the steps of the invention.
- FIGS. 1 and 2 show the major components of the invention.
- Self-priming centrifugal pump 1 is comprised of engine 4 connected to housing 6 .
- Housing 6 contains impeller 5 which receives rotary power from engine 4 through shaft 8 .
- Shaft 8 is maintained water-tight by seal 9 .
- Impeller 5 receives liquid material at its center through inlet port 2 and expels it outwardly, centrifugally, creating thereby pressure, or head. The expelled material is thrown into a circular path in volute 7 and exits there from through discharge port 3 .
- a means for continuously cooling the seal 20 is facilitated by coupler 21 in inlet port 2 .
- said means is a pressurized source of liquid 22 .
- the pressurized source of liquid 22 may be water under line pressure supplied by hose 23 . Coupler 21 and hose 23 are connected in a manner that is sealed and prevents the suction from being vented.
- the pressure in the pressurized source of liquid 22 must be such that only a fraction of the pump capacity is utilized in processing the flow of liquid there through during a dry cycle. In other words, it is required that suction remains available in inlet port 2 to resume pumping when the cycle returns to wet.
- the fraction of pump capacity is defined by the pressure source delivering 3-10 gpm to a centrifugal pump operating at 100-150 gpm.
- Centrifugal pumps such as that shown in FIG. 1 can be found at pump supply distributors.
- the self-priming centrifugal pump 1 is a NorthStarTM 2-inch semi-trash pump.
- Inlet port 2 and coupler 21 can be easily fabricated with 2-inch PVC pumping materials.
- the one-quarter inch hose 23 is a ubiquitous hardware item.
- Water for the pressurized source of liquid 22 can be supplied from any utility having line pressure, such as well or tap water
- a method of de-watering an intermittently dry pool 10 is shown in the process diagram of FIG. 3 .
- the method comprises the steps of providing a self-priming centrifugal pump 11 , connecting the impeller to an engine through a shaft and seal 12 , establishing fluid communication between the inlet port and pool 13 , and introducing a pressurized liquid to the input at fractional pump capacity 14 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A method of de-watering during intermittent dry running periods with a self-priming centrifugal pump is presented. Centrifugal pumps, as opposed to diaphragm pumps, are advantageous because they are less expensive and can provide greater capacity. The shaft seals are sensitive, however, to frictional heating when water flow is interrupted. In some situations, this fractional heating may desiccate self-priming. The inventive concept provides a continuous stream of pressurized water moving through the pump to cool the seal and sustain priming capability without substantially impairing the ability of the pump to resume wet operation.
Description
- This invention relates to centrifugal pumps, and more particularly the use of self-priming centrifugal pumps for de-watering scenarios.
- Centrifugal pumps have high capacity, measured in gallons per hour (gph), are readily available, and are generally inexpensive. They are, however, unsuitable for de-watering because de-watering requires intermittent to extended periods of dry operation. An example of a de-watering scenario is the draining of a thin mud slurry sloughed onto a recovery mat while washing trucks, or other vehicles.
- Reciprocating diaphragm pumps can be operated dry and are suitable for dewatering. They have low capacity, however, and can be quite expensive. Compared to the least expensive diaphragm pump, a centrifugal pump could cost 70%-80% less while having twice the head and nearly four times the capacity for throughput.
- The impeller of a centrifugal pump has a shaft which extends through a housing to an external motor. The housing, which is a chamber containing the volute, is rendered water-tight by means of a seal surrounding the shaft, or the bearing in which the shaft is situated. The seal can be degraded by the heat of friction, which is normally dissipated by the circulation of fluid through the chamber. The seal can be quickly destroyed, however, during a period of dry running, such as may occur when water is draining from a slurry into a pool which is periodically pumped dry.
- U.S. Pat. No. 5,667,357 to Buse et al discloses a system for providing a flow of water to the bearing seal during intermittent periods of dry running. The water is recycled from a reservoir connected to the output port of the pump. The reservoir is effectively a bulge in an ascending pipe which retains a body of water therein. The pressure gradient, or head, caused by the rotating impeller, drives a recirculation current from the body of water through a pre-existing channel system, designed to externally irrigate the bearing casing, back to the volute chamber.
- U.S. Pat. No. 4,773,823 to Pease teaches a similar system, except that the object in this case is to increase the life of the seal rather than to sustain dry running periods. The re-circulated water is drawn not from a reservoir, but directly from the volute. Since there is always a torus of water in the volute, even during dry running, conceptually there is a supply, at least for short periods, for continuous recirculation.
- In both Buse and Pease, the cooling effect is achieved by water which has been previously heated and recycled. The system, therefore, is thermally inefficient and, in some sense, self-defeating. In addition, the porting through the bearing housing for channeling the recirculation would weaken the very structure which is under dynamic stress. What is needed is a simple method of providing a continuous flow of fresh water through the pump when the suction is otherwise dry-cycling.
- It is accordingly an object of the invention to provide a method for cooling the shaft seal of a self-priming centrifugal pump during intermittent dry running.
- It is a second object to provide a simple method, which can be easily implemented on any existing self-priming pump.
- It is a third object to provide a flush of fresh water under pressure through the pump at all times during running, whether running wet or dry.
- It is a fourth object to provide a sufficient flow of water to ensure that the pump does not lose its capability to re-prime.
- These and other objects of the invention to become apparent hereinafter in accordance with the invention in a method of dewatering an intermittently dry pool, comprising the steps of providing a self-priming centrifugal pump having inlet and discharge ports and an impeller; connecting the impeller to an engine through a shaft fitted with a seal providing water-tight isolation, the impeller creating a head manifest as suction in the inlet port; establishing fluid communication between the inlet port and the pool; and introducing a means for continuously cooling the shaft seal without occluding the suction, whereby degradation of the seal by heat of friction is avoided.
- In a preferred embodiment of the method of dewatering, the means for continuously cooling is provided by a pressurized source of liquid introduced to the inlet port at a fraction of the pump capacity, the liquid streaming continuously regardless of dry or wet operation. In a particular preferred embodiment, the liquid is water under line pressure.
- As this is not intended to be an exhaustive recitation, other embodiments may be learned from practicing the invention or may otherwise become apparent to those skilled in the art.
- Various other objects, features and attendant advantages of the present invention will become fully appreciated as the same becomes better understood through the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein:
-
FIG. 1 is a perspective view of the invention, illustrating a centrifugal pump connected to a source of streaming water; -
FIG. 2 is a partial exploded view of the centrifugal pump ofFIG. 1 in perspective; and -
FIG. 3 is a process diagram following the steps of the invention. -
FIGS. 1 and 2 show the major components of the invention. Self-primingcentrifugal pump 1 is comprised of engine 4 connected tohousing 6.Housing 6 containsimpeller 5 which receives rotary power from engine 4 throughshaft 8. Shaft 8 is maintained water-tight by seal 9.Impeller 5 receives liquid material at its center throughinlet port 2 and expels it outwardly, centrifugally, creating thereby pressure, or head. The expelled material is thrown into a circular path in volute 7 and exits there from throughdischarge port 3. - In the preferred embodiment, a means for continuously cooling the
seal 20 is facilitated bycoupler 21 ininlet port 2. In a particularly preferred embodiment, said means is a pressurized source ofliquid 22. The pressurized source ofliquid 22 may be water under line pressure supplied byhose 23.Coupler 21 andhose 23 are connected in a manner that is sealed and prevents the suction from being vented. - The pressure in the pressurized source of
liquid 22 must be such that only a fraction of the pump capacity is utilized in processing the flow of liquid there through during a dry cycle. In other words, it is required that suction remains available ininlet port 2 to resume pumping when the cycle returns to wet. In a particularly preferred embodiment, the fraction of pump capacity is defined by the pressure source delivering 3-10 gpm to a centrifugal pump operating at 100-150 gpm. - Construction materials are readily available. Centrifugal pumps, such as that shown in
FIG. 1 can be found at pump supply distributors. In the specific case ofFIG. 1 , the self-primingcentrifugal pump 1 is a NorthStar™ 2-inch semi-trash pump.Inlet port 2 andcoupler 21 can be easily fabricated with 2-inch PVC pumping materials. The one-quarter inch hose 23 is a ubiquitous hardware item. Water for the pressurized source ofliquid 22 can be supplied from any utility having line pressure, such as well or tap water - A method of de-watering an intermittently dry pool 10 is shown in the process diagram of
FIG. 3 . The method comprises the steps of providing a self-primingcentrifugal pump 11, connecting the impeller to an engine through a shaft andseal 12, establishing fluid communication between the inlet port andpool 13, and introducing a pressurized liquid to the input atfractional pump capacity 14. - While a particular form of the invention has been illustrated and described, it will be apparent that various modifications can be made without departing from the spirit and scope of the invention. For example, the invention could be practiced with the pump located at an elevation below that of a body of water, such as a pond, by means of siphoning. Accordingly, it is not intended that the invention be limited, except as by the appended claims.
Claims (6)
1. A method of dewatering an intermittently dry pool, comprising the steps of:
providing a self-priming centrifugal pump having inlet and discharge ports and an impeller;
connecting the impeller to an engine through a shaft fitted with a seal providing water-tight isolation, the impeller creating head manifest as suction in the inlet port;
establishing fluid communication between the inlet port and the pool; and
introducing a means for continuously cooling the shaft seal without occluding the suction, whereby degradation of the seal by heat of friction is averted.
2. The method of dewatering of claim 1 , wherein the means for continuously cooling is provided by a pressurized source of liquid introduced to the inlet port at a fraction of the pump capacity, the liquid streaming continuously regardless of dry operation.
3. The method of dewatering of claim 2 , wherein the liquid is water under line pressure.
4. The method of dewatering of claim 2 , wherein the fraction of the pump capacity is defined by the pressurized source delivering 3-10 gpm to a centrifugal pump operating at 100-150 gpm.
5. A method of dewatering an intermittently dry pool, comprising the steps of:
providing a self-priming centrifugal pump having inlet and discharge ports and an impeller;
connecting the impeller to an engine through a shaft fitted with a seal providing water-tight isolation, the impeller creating head manifest as suction in the inlet port;
establishing fluid communication between the inlet port and the pool; and
introducing a pressurized source of liquid to the inlet port at a fraction of the pump capacity, whereby a continuous stream of fresh liquid is provided through the pump to prevent the seal from overheating and degrading.
6. The method of dewatering of claim 5 , wherein the liquid is water under line pressure.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/497,190 US20110002769A1 (en) | 2009-07-02 | 2009-07-02 | Centrifugal pump for de-watering |
US13/632,282 US9909593B2 (en) | 2009-07-02 | 2012-10-01 | Centrifugal pump for de-watering |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/497,190 US20110002769A1 (en) | 2009-07-02 | 2009-07-02 | Centrifugal pump for de-watering |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/632,282 Continuation-In-Part US9909593B2 (en) | 2009-07-02 | 2012-10-01 | Centrifugal pump for de-watering |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110002769A1 true US20110002769A1 (en) | 2011-01-06 |
Family
ID=43412764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/497,190 Abandoned US20110002769A1 (en) | 2009-07-02 | 2009-07-02 | Centrifugal pump for de-watering |
Country Status (1)
Country | Link |
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US (1) | US20110002769A1 (en) |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US656465A (en) * | 1900-04-30 | 1900-08-21 | Franz Marburg Jr | Turbine pumping mechanism. |
US1493509A (en) * | 1922-01-28 | 1924-05-13 | Don S Willey | Centrifugal pump |
US2259361A (en) * | 1937-10-09 | 1941-10-14 | La Mont Corp | Feed water by-pass seal for boiler circulating pumps |
US4134711A (en) * | 1976-11-26 | 1979-01-16 | Engineers Sales-Service Co., Inc. | Submersible pump apparatus |
US4256436A (en) * | 1977-12-24 | 1981-03-17 | Sihi Gmbh & Co. Kg | Self-priming pump |
US4488852A (en) * | 1976-11-26 | 1984-12-18 | Engineers Sales-Service Co., Inc. | Submersible pump apparatus |
US4737072A (en) * | 1984-09-20 | 1988-04-12 | Ihc Holland N.V. | Centrifugal pump |
US5100288A (en) * | 1990-06-15 | 1992-03-31 | Atsco, Inc. | Slurry pump apparatus |
US5599164A (en) * | 1995-04-03 | 1997-02-04 | Murray; William E. | Centrifugal process pump with booster impeller |
US5868550A (en) * | 1997-05-13 | 1999-02-09 | Howchin; Robert W. | Pump assembly |
US7094016B1 (en) * | 1999-07-21 | 2006-08-22 | Unitec Institute Of Technology | Multi-phase flow pumping means and related methods |
US20080089777A1 (en) * | 2006-08-30 | 2008-04-17 | Lang John P | Self-priming adapter apparatus and method |
-
2009
- 2009-07-02 US US12/497,190 patent/US20110002769A1/en not_active Abandoned
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US656465A (en) * | 1900-04-30 | 1900-08-21 | Franz Marburg Jr | Turbine pumping mechanism. |
US1493509A (en) * | 1922-01-28 | 1924-05-13 | Don S Willey | Centrifugal pump |
US2259361A (en) * | 1937-10-09 | 1941-10-14 | La Mont Corp | Feed water by-pass seal for boiler circulating pumps |
US4134711A (en) * | 1976-11-26 | 1979-01-16 | Engineers Sales-Service Co., Inc. | Submersible pump apparatus |
US4488852A (en) * | 1976-11-26 | 1984-12-18 | Engineers Sales-Service Co., Inc. | Submersible pump apparatus |
US4256436A (en) * | 1977-12-24 | 1981-03-17 | Sihi Gmbh & Co. Kg | Self-priming pump |
US4737072A (en) * | 1984-09-20 | 1988-04-12 | Ihc Holland N.V. | Centrifugal pump |
US5100288A (en) * | 1990-06-15 | 1992-03-31 | Atsco, Inc. | Slurry pump apparatus |
US5599164A (en) * | 1995-04-03 | 1997-02-04 | Murray; William E. | Centrifugal process pump with booster impeller |
US5868550A (en) * | 1997-05-13 | 1999-02-09 | Howchin; Robert W. | Pump assembly |
US7094016B1 (en) * | 1999-07-21 | 2006-08-22 | Unitec Institute Of Technology | Multi-phase flow pumping means and related methods |
US20080089777A1 (en) * | 2006-08-30 | 2008-04-17 | Lang John P | Self-priming adapter apparatus and method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |