US3833316A - Variable volume pump - Google Patents
Variable volume pump Download PDFInfo
- Publication number
- US3833316A US3833316A US00218288A US21828872A US3833316A US 3833316 A US3833316 A US 3833316A US 00218288 A US00218288 A US 00218288A US 21828872 A US21828872 A US 21828872A US 3833316 A US3833316 A US 3833316A
- Authority
- US
- United States
- Prior art keywords
- pump
- fluid
- pressure
- variable volume
- valve
- 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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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
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/016—Special constructions of flushing devices, e.g. closed flushing system with recirculation of bowl-cleaning fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
-
- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Definitions
- This invention relates to circulating fluid systems and, more particularly to an improved variable volume pump.
- the task of maintaining toilet systems is not the most desirable one, and it has been deemed preferable to limit, wherever possible, the number of elements requiring repair, service, or maintenance.
- Other systems have been suggested in which a single, high volume pump is connected to serve several toilet units all of which share a common storage tank. Each toilet has a 3-way valve which by-passes unwanted flush water back to the waste tank when the toilet is not being flushed. ln order to flush a particular toilet, the 3-way valve is operated to divert flush water into the bowl instead of the drain line.
- the pump filter is operating at full capacity at all times whether one or all toilets are being flushed, contents of storage tank are continually being agitated, and
- a high volume pump is provided with an internal by-pass relief valve, that returns fluid from the outlet side to the inlet side of the pump thus by-passing the output line.
- the relief valve is controlled by a pressure sensor connected to the output line. When a toilet flush valve is actuated, the pump is energized and the pressure sensor ascertains the fluid pressure in the line.
- the relief valve is operated to divert fluid flow from the output line, thereby reducing the pressure in the output line.
- the FIGURE is a side sectional view of a variable volume pump according to the present invention.
- FIG. 1 is a side sectional view of a variable volume pump 10 according to the present invention, and suitable for use in the systems described below.
- the pump 10 includes a motor 12 which is fastened to a top cover plate 14.
- a motor drive shaft 16 passes through the plate 14 and is coupled, by a connector member 18, to a pump drive shaft 20.
- the pump drive shaft 20 includes a drive gear 22 which meshes with a transmission assembly 24, to rotationally drive a filter basket 26.
- the pump drive shaft 20 terminates in a pump impeller 28 which draws fluid from the pump interior and drives the fluid through an outlet duct 30.
- a check valve 32 in the duct 30 permits unidirectional flow offluid from the pump to an output line 34, which is coupled to the several utilization devices (not shown).
- a small by-pass orifice (not shown) is provided adjacent to the check yalve 32 to facilitate self-draining of the output lines and to preclude freezing of the lines in low temperatures.
- the filter basket 26 is rotatably attached to a pump bottom plate 36, which includes a pump inlet orifice 38, by fastening means, here shown as a bolt 40.
- the filter basket 26 itself has a ring gear 42, integral with the inner periphery of the basket 26 at its upper, open end.
- a filter basket drive gear 44 is driven from the gear train of the transmission assembly 24.
- the filter basket 26 includes a plurality of parallel circumferential slots 46 which serve to filter the fluid taken into the pump 10.
- a plurality of scraper blades 48 is carried by a suitable shaft 50. The blades 48 protrude through the slots 46 to dislodge any solid matter as the basket 26 rotates.
- the pump 10 is generally similar to pumps of the prior art which have been employed in similar systems.
- the pump 10 in addition, includes a by-pass valve 52 which is controlled by the pressure in the output line 34.
- the by-pass valve assembly 52 includes a valve stem 54 which carries a valve head 56 that seats against a by-pass opening 58 in the pump outlet 30. When opened, the by-pass valve 52 permits fluid to flow through the by-pass opening 58 to a return line 60 which is opened to the interior of the filter basket 26.
- the by-pass valve stem 54 extends through a fluid impermeable diaphragm member 62.
- the valve stem 54 is biased into the closed position by a spring member 66, resting upon a spring plate 68.
- a fluid inlet 72 is provided which couples to a pressure sensing line 74.
- the operating region of the by-pass valve 52 can be determined.
- the pressure in the output line 34 rises above a predetermined setting, approximately PSI, the fluid pressure in the valve chamber 70 exceeds the bias spring pressure and the valve stem 54 is moved to the right as viewed in FIG. 1, opening the valve.
- Fluid then by-passes-the output line 34 and returns to the inlet side of the pump through the interior of filter basket 26 through the by-pass return 60.
- the low impedance return path reduces the pressure in the output line 34. Since a substantially closed feedback loop is involved, the pressure in the output line 34 will stabilize at the preset magnitude. If more than one utilization device is on-line," the pressure in the output line 34 will drop. A reduction of pressure enables the bias spring 66 to move the valve stem 54 to the left, closing the by-pass valve 52 and increasing the pressure in the output line 34.
- a differential pressure equalizer assembly 80 is provided to protect the transmission assembly 24 and a gear box 82 in which it is located.
- the gear box 82 and the housing 84 in which the pump drive shaft is located. are charged with a lubricant 86.
- Shaft seals are of course provided to prevent fluids from entering the gear box 82 and to prevent lubricant 86 from leaking out of the gear box 82. Since a primary cause of leakage would be a pressure differential, as between the interior of the gear box 82 and the environment in which it is located, the pressure equalization assembly 80 is provided.
- An elastic, fluid tight bag member or envelope 88 is fastened to the exterior of the gear box 82 and is in fluid communication therewith through a duct 90.
- any lubricant that might escape is retained within the interior of the envelope 88. Any changes in pressure either cause the envelope 88 to expand or contract, thereby providing a variable volume which can be affected by pressure changes. Any leakage of lubricant 86 is retained in the envelope 88. Subsequent pressure changes permit the lubricant to be returned to the gear box 82.
- variable volume pump comprising in combination:
- a. pumping means having an inlet and an outlet and including a motor, a pump, transmission means coupling said motor to said pump, and pressure equalizing means coupled to said transmission means for preventing leakage of fluid between said transmission means and a reservoir resulting from pressure differential therebetween;
- said pressure equalizing means including a flexible fluid-tight sac in fluid communications with said transmission means, adapted to be located in the reservoir, whereby pressure differentials as between the reservoir and said transmission means result in fluid flow between said sac interior and said transmission means while maintaining fluid isolation as between said transmission means and the reservoir;
- fluid pressure sensing means connected to said fluid delivery means and adapted to provide first signals representing the pressure of fluid being supplied at the utilization device
- by-pass means connecting said pumping means outlet and inlet and being coupled to said fluid pressure sensing means, said by-pass means being connected to apply fluid from the outlet side of said pumping means to the inlet side of said pumping means, between said filter and said inlet.
- said bypass means being operable in response to applied first signals for diverting sufficient fluid from said pumping means outlet to said inlet to maintain the fluid pressure at the utilization device at a desired
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
D R A W I N G
Description
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00218288A US3833316A (en) | 1970-03-05 | 1972-01-17 | Variable volume pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1674070A | 1970-03-05 | 1970-03-05 | |
US00218288A US3833316A (en) | 1970-03-05 | 1972-01-17 | Variable volume pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US3833316A true US3833316A (en) | 1974-09-03 |
Family
ID=26689003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00218288A Expired - Lifetime US3833316A (en) | 1970-03-05 | 1972-01-17 | Variable volume pump |
Country Status (1)
Country | Link |
---|---|
US (1) | US3833316A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4315415A (en) * | 1979-08-21 | 1982-02-16 | John Zink Company | Plenum type variable air volume mounting curb |
WO1994010448A1 (en) * | 1992-11-05 | 1994-05-11 | Rig Technology Limited | Apparatus for pumping a slurry |
CN102079294A (en) * | 2009-12-01 | 2011-06-01 | 现代自动车株式会社 | Washer pump having washer fluid heating function |
-
1972
- 1972-01-17 US US00218288A patent/US3833316A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4315415A (en) * | 1979-08-21 | 1982-02-16 | John Zink Company | Plenum type variable air volume mounting curb |
WO1994010448A1 (en) * | 1992-11-05 | 1994-05-11 | Rig Technology Limited | Apparatus for pumping a slurry |
CN102079294A (en) * | 2009-12-01 | 2011-06-01 | 现代自动车株式会社 | Washer pump having washer fluid heating function |
US20110126927A1 (en) * | 2009-12-01 | 2011-06-02 | Hyundai Motor Company | Washer pump having washer fluid heating function |
US8480380B2 (en) * | 2009-12-01 | 2013-07-09 | Hyundai Motor Company | Washer pump having washer fluid heating function |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MAG AEROSPACE INDUSTRIES, INC., C/O VESTAR CAPITAL Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MONOGRAM INDUSTRIES, INC.;REEL/FRAME:005152/0265 Effective date: 19890718 |
|
AS | Assignment |
Owner name: HELLER FINANCIAL, INC. Free format text: SECURITY INTEREST;ASSIGNOR:MAG AEROSPACE INDUSTRIES, INC., A CORP. OF DE;REEL/FRAME:006198/0529 Effective date: 19920626 |
|
AS | Assignment |
Owner name: MAG AEROSPACE INDUSTRIES, INC., CALIFORNIA Free format text: RELEASE AND REASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:HELLER FINANCIAL, INC.;REEL/FRAME:008354/0071 Effective date: 19961202 |