US20060159574A1 - Piston pump - Google Patents

Piston pump Download PDF

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Publication number
US20060159574A1
US20060159574A1 US10/561,978 US56197805A US2006159574A1 US 20060159574 A1 US20060159574 A1 US 20060159574A1 US 56197805 A US56197805 A US 56197805A US 2006159574 A1 US2006159574 A1 US 2006159574A1
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US
United States
Prior art keywords
piston
propelling
pump according
pump
pumps
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
Application number
US10/561,978
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English (en)
Inventor
Gerhard Winiger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20060159574A1 publication Critical patent/US20060159574A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members

Definitions

  • the invention is with regard to a piston pump with a pump casing and a piston that narrows the working chamber in a pump cylinder through an elevating motion, in accordance with the preamble of patent claim 1 .
  • the invention preferably deals with a piston pump to convey or meter fluid media of the most varied nature.
  • Piston pumps are generally established in a multiplicity of design versions and serve the most varied conveying or driving requirements (hydraulics). Piston pumps established in process engineering utilize only one front surface of the piston to fill and eject the pump medium. This results in unwanted pulsation which takes place in a sinusoidal manner in the case of a crank assembly for the intake and working stroke with its negative consequences on the Net Positive Suction Head (Net Positive Inlet Head) and on the cavitation respectively.
  • the valve function is purely automatic in the case of these pump pistons i.e., the suction vacuum and the pressure of the working stroke respectively opens and closes the check valves respectively.
  • VANE FRANCIS BARRITT proposed furnishing the two operative sides of a pump with a valve control composed of a plurality of levers or something approximating it, in fact one for every valve in a pair, whereby a cam device which they have in common and which is driven by the connecting rod of the engine, acts upon the valve lever mentioned or upon something approximating it.
  • His valve control emanates from a cam device that is composed of a slide valve or sliding block connected to a connecting rod and is triggered to follow a groove whose upper surface consists of the enlarged ends or buttons of a pivoted lever that are customized to control the valves.
  • FR 551 600 A M.
  • ARTHUR CASTELNAU later proposed a double operative pump whose opening or closing of the suction and discharge pipes were to take place with the help of a slide valve with a to and fro movement, whereby the slide valve glides on a shear panel or between two shear panels and is designed to pick up soft particulate matter lying in its path or to cut up same during its passage.
  • Both inventions together have complex mechanics with many individual parts and thus many friction and wear surfaces. Apart from this, these proposed constructions are difficult to seal towards the exterior due to their many sliding and friction surfaces.
  • a double operative piston pump is proposed in DE 11 77 007 b (DEKA SA) whose inlet and discharge valves are coupled hydraulically to a piston each, whereby their cylinders are respectively connected in pairs to one another by means of a closed pipeline. It is rather unlikely that this proposal has been tried in practice since the marginal suction pressure in the inlet valve and its piston force respectively is not capable of maintaining a higher pump supply pressure over the connected pistons of the closing valves and so the same will therefore leak. In addition, this proposal has many sealed locations that collectively make it difficult to control the pump and its mechanism.
  • the task of the invention is to make a piston pump of the type initially described available, which is low on pulsation and functions efficiently with just one piston, possesses positively controlled suction and pressure valves and has a simple, compact design.
  • the piston narrows the working chamber in the pump cylinder at two sides with its upper and lower piston front surfaces and in that the working chamber is connected by every positively controlled inlet valve and by every positively controlled discharge valve that, alternating in each case, open and close respectively when the two end positions of the piston are reached for filling and ejection of the working volume.
  • the piston's double impact in accordance with the invention, results in an additional reduction of the working volume by the volume share of the piston rod per working stroke whereby the performance is almost doubled and a discharge stream with low pulsation results.
  • Marginal residual pulsation exists only for the short period when valves change from “open” to “close” when the two extreme positions of the piston are reached in the cylinder.
  • valve rods alternatively pierce the valves, the pump casing and the valve lid on one side and are connected at the ends by a compensator whose one end is extended and movably connects the valve rods to the conveying lever by a plate.
  • a cylinder with loaded pistons whose piston rod pierces the cylinder be connected to the pump lid by a propelling lever and that this propelling lever should movably incorporate a propelling rod in the region between its two pivotal points, this propelling rod being movably connected at the other end to the conveying lever.
  • Propulsion should preferably take place with a pneumatic cylinder that is furnished with an automatic switch-over device at the two end positions of the piston.
  • the piston pump can hereby also be used in ex-zones.
  • a further suggestion in accordance with the invention for compactness and simplicity is that the pump casing should possess three bores that lie in an axis, whereby one bore forms the working chamber and the other two bores each with a cross hole, form the inlet and discharge channels respectively in such a manner that during pump operation the inlet valve and discharge valves close and open the bores at one end alternatively for the piston's elevating motion.
  • the conveying lever hereby comes to lie in the middle of the pump's longitudinal axis through which the design turns out to be simple and space-saving.
  • valves are designed in such a manner in accordance with the invention that the valve rods have a screw thread with a nut at the end of that side that faces the pump lid and by screwing in or screwing out of which the distances of the valve pairs that are located laterally reversed, becomes smaller or greater for clearance adjustment.
  • the valve seats can thereby be designed to be flat, conical or tapered. The most minimal stroke is achieved in the case of required valve opening cross-section with a flat seating valve.
  • valves can be designed to have an elastic coating.
  • the structure of the piston pump in accordance with the invention, enables driving two or a larger number of piston pumps synchronously by coupling their propelling lever to a common piston rod.
  • the pumps to be coupled preferably lie vertically one over the other in such a manner that the propelling rods can be connected directly to the cylinder lying under it whereby all pumps have a common propulsion at their disposal.
  • two or several pumps can also be located next to one another and be synchronously operated by a common connection of their piston rods.
  • a pneumatic cylinder with a flip-flop switching mechanism is preferable for propulsion. Every type of linear propulsion or crank assembly is, however, suitable for connection.
  • the supply stream is however sinusoidal with a negative impact on the Net Positive Suction Head NPSH.
  • Supply quantities in the case of constant stroke frequency can be regulated in accordance with the invention by modifying the supply stroke individually in the case of every coupled pump by pushing their propelling rods to their propelling lever.
  • FIG. 1 is the longitudinal view of the piston pump.
  • FIG. 2 represents section A-A running through the piston pump
  • FIG. 3 is the sheer plan of two coupled pump pistons.
  • a pump casing 1 , 2 , 3 is illustrated in FIG. 1 with a pump cylinder 5 in which a piston pump 4 that is sealed with an O-Ring 6 is driven by a piston rod 7 .
  • the piston sealed by an O-Ring 6 and a gasket 9 rod, pierces the pump casing 3 and the valve lid 8 with its end that faces away from the pump piston 4 and is connected at its end by a compensator 19 whose end is elongated and movably connects the valve rods 11 , 15 to the conveying lever 25 through a plate 22 .
  • the conveying lever 25 pivots with anti-friction bushes 23 , 26 , 27 , and is connected to the propelling lever 31 by a propelling rod 28 .
  • the propelling rod 31 is dissected in the middle so that the conveying lever 25 can be modified using a removable bolt 32 at its point of application.
  • the pump piston's 4 stroke can thus be increased or reduced.
  • the propelling lever 31 is connected in joints at one end to the pump lid 2 and with its other end to the piston rod 35 by bolts 33 , 34 .
  • the piston rod 35 protrudes from a pneumatic cylinder 36 that is controlled in such a manner that it automatically moves to and fro permanently (flip-flop switching mechanism). It is preferable that this take place through two magnetic switches and two pneumatic valves for both piston end positions.
  • the valve lid 8 is distanced from the base plate 29 by four distancing rods 30 .
  • the compensator 19 is supported by an anti-friction bush 21 on the elevation of the valve lid 8 in the middle of the two valve rods 11 , 15 .
  • the compensator 19 is somewhat elongated at that end that faces away from the pump piston 4 and, pivoting over anti-friction bushes 23 , 24 , is connected to a plate 22 .
  • This elongation of the compensator 19 i.e., the distance between the force effect through the plate 22 and the pivoting point 21 of the compensator 19 is to be selected in such a manner that the expenditure of energy required to operate the valve rods 11 , 15 over the pivoting points 18 , 20 must be manifestly lower than the energy expended to move the pump piston.
  • the conveying lever 25 would otherwise turn only at the pivoting point 23 without moving the valve rods 11 , 15 .
  • FIG. 2 illustrates section A-A through the piston pump in the middle of the inlet valves 14 , 16 .
  • This cross-section shows the inlet port c in particular which, depending on the position of the two valves 14 , 16 that are located laterally reversed up or down, close and open respectively.
  • FIG. 3 illustrates a sheer plan of the two piston pumps that are connected one over the other in accordance with FIG. 1 with a common pneumatic cylinder 36 providing propulsion.
  • the piston rod 35 of this pneumatic cylinder 36 drives an extension rod 38 through a rotating bolt connection 37 , this rod for its part propelling the conveying lever 40 of a second piston pump through a rotating bolt connection 39 .
  • the conveying lever 40 has a recess that contains a spindle with spindle nut 43 between its pivotal points 39 , 45 , to which the propelling rod 44 is fixed in joints.
  • the propelling rod 44 runs in the direction of the piston pump or in the direction of the hand wheel 42 .
  • the piston stroke of the two pumps that are coupled is hereby modified, whereby the modified supply quantities to the first pump can be set by the same bore of the supply cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US10/561,978 2003-07-02 2004-06-01 Piston pump Abandoned US20060159574A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH11692003 2003-07-02
CH1169,03 2003-07-02
PCT/CH2004/000327 WO2005003559A1 (de) 2003-07-02 2004-06-01 Kolbenpumpe

Publications (1)

Publication Number Publication Date
US20060159574A1 true US20060159574A1 (en) 2006-07-20

Family

ID=33557709

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/561,978 Abandoned US20060159574A1 (en) 2003-07-02 2004-06-01 Piston pump

Country Status (6)

Country Link
US (1) US20060159574A1 (zh)
EP (1) EP1680597A1 (zh)
JP (1) JP2007506895A (zh)
CN (1) CN100406723C (zh)
EA (1) EA007695B1 (zh)
WO (1) WO2005003559A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016144161A1 (en) * 2015-03-09 2016-09-15 Weir Minerals Netherlands B.V. Hydraulic pump system for handling a slurry medium
US11255316B2 (en) * 2018-02-15 2022-02-22 Jacobsen Innovations, Inc. Pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD640Z (ro) * 2012-11-16 2013-12-31 Институт Прикладной Физики Академии Наук Молдовы Pompă electrostatică cu piston (variante)
EP3207249B1 (en) * 2016-01-06 2018-05-09 Udiflow Limited A reciprocating pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US517589A (en) * 1894-04-03 Valve device
US1982770A (en) * 1929-07-17 1934-12-04 Wood Newspaper Mach Corp Constant volume pump
US2752862A (en) * 1951-04-19 1956-07-03 Boakes James Walter Valve operating system
US3565398A (en) * 1968-12-23 1971-02-23 Goodrich Co B F Pneumatic bag jack
US3597120A (en) * 1969-05-14 1971-08-03 John H Reed Injector-recirculation pump
US20020091697A1 (en) * 1998-12-07 2002-07-11 Erwin Steve Huang Virtual desktop in a computer network

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191208480A (en) * 1912-09-09 1913-05-22 Francis Barritt Vane Improvements in Valves and Valve Gear for Fluid Pressure Engines, Pumps, and the like.
FR551600A (fr) * 1922-05-18 1923-04-09 Pompe pour l'élévation de liquides chargés de matières solides mais tendres
SU8042A1 (ru) * 1927-01-13 1929-02-28 Д.И. Шпилев Поршневой насос дл загр зненных жидкостей
DE1177007B (de) * 1959-03-31 1964-08-27 Deka Sa Steuerung der Ein- und Auslassventile einer doppeltwirkenden Kolbenpumpe in gegenseitiger zwanglaeufiger Abhaengigkeit voneinander
SE327098B (zh) * 1968-01-12 1970-08-10 Linson Instr Ab
CN87205266U (zh) * 1987-12-09 1988-06-29 张德生 手压式双筒抽水器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US517589A (en) * 1894-04-03 Valve device
US1982770A (en) * 1929-07-17 1934-12-04 Wood Newspaper Mach Corp Constant volume pump
US2752862A (en) * 1951-04-19 1956-07-03 Boakes James Walter Valve operating system
US3565398A (en) * 1968-12-23 1971-02-23 Goodrich Co B F Pneumatic bag jack
US3597120A (en) * 1969-05-14 1971-08-03 John H Reed Injector-recirculation pump
US20020091697A1 (en) * 1998-12-07 2002-07-11 Erwin Steve Huang Virtual desktop in a computer network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016144161A1 (en) * 2015-03-09 2016-09-15 Weir Minerals Netherlands B.V. Hydraulic pump system for handling a slurry medium
AU2016229643B2 (en) * 2015-03-09 2020-10-01 Weir Minerals Netherlands B.V. Hydraulic pump system for handling a slurry medium
US11255316B2 (en) * 2018-02-15 2022-02-22 Jacobsen Innovations, Inc. Pump

Also Published As

Publication number Publication date
JP2007506895A (ja) 2007-03-22
EA200600151A1 (ru) 2006-06-30
WO2005003559A1 (de) 2005-01-13
EP1680597A1 (de) 2006-07-19
CN100406723C (zh) 2008-07-30
CN1813131A (zh) 2006-08-02
EA007695B1 (ru) 2006-12-29

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