WO1999051880A2 - Pompe a piston multicylindre - Google Patents

Pompe a piston multicylindre Download PDF

Info

Publication number
WO1999051880A2
WO1999051880A2 PCT/IB1999/000550 IB9900550W WO9951880A2 WO 1999051880 A2 WO1999051880 A2 WO 1999051880A2 IB 9900550 W IB9900550 W IB 9900550W WO 9951880 A2 WO9951880 A2 WO 9951880A2
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
cylinder piston
piston pump
pistons
pump according
Prior art date
Application number
PCT/IB1999/000550
Other languages
English (en)
Other versions
WO1999051880A3 (fr
Inventor
Allen Norman Geldenhuys
Leon Basil Geldenhuys
Daniel Lucas Geldenhuys
Original Assignee
Allen Norman Geldenhuys
Leon Basil Geldenhuys
Daniel Lucas Geldenhuys
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 Allen Norman Geldenhuys, Leon Basil Geldenhuys, Daniel Lucas Geldenhuys filed Critical Allen Norman Geldenhuys
Priority to AU28489/99A priority Critical patent/AU2848999A/en
Publication of WO1999051880A2 publication Critical patent/WO1999051880A2/fr
Publication of WO1999051880A3 publication Critical patent/WO1999051880A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C23/00—Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
    • A01C23/02—Special arrangements for delivering the liquid directly into the soil
    • A01C23/023—Special arrangements for delivering the liquid directly into the soil for liquid or gas fertilisers
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/146—Swash plates; Actuating elements
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/16—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having two or more sets of cylinders or pistons
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type

Definitions

  • THIS invention relates to a multi-cylinder piston pump.
  • a pump according to the invention can be used to pump liquid fertiliser.
  • the pump would be mounted on an agricultural planter so as to pump accurate volumes of liquid fertiliser at required locations, for example where seeds are planted by the planter.
  • Pumps of generally peristaltic type have conventionally been used to pump liquid fertiliser in agricultural applications.
  • the pump is supplied from a header tank which is mounted on the planter and initially filled with the fertiliser in question.
  • the output of the known pump is dependent to some degree on the static head of fertiliser in the tank as determined by the level thereof, and this varies as the fertiliser is used up.
  • pumps of the known type are inconsistent and inaccurate in operation. This in turn may result in incorrect fertiliser coverage which is obviously undesirable.
  • a multi-cylinder piston pump comprising a cam rotatable about an axis and a plurality of pumping pistons which are reciprocable in cylinders spaced angularly apart from one another about the cam axis, the cam including a peripheral, waviform formation which engages the pistons to cause the pistons to reciprocate in their cylinders when the cam rotates.
  • the cam has an outwardly directed, waviform projection engaging in recesses in the pistons.
  • the pump comprises a pump casing in which the cylinders are located, the pump casing including an inlet for introducing liquid which is to be pumped into the cylinders and at least one outlet through which liquid is pumped from the cylinders by the pistons when the pistons reciprocate.
  • the pistons may be double-acting and there is preferably an outlet for each cylinder.
  • the pump may also include means for closing off at least some of the outlets to prevent liquid being pumped therethrough and for recirculating such liquid to the cylinders.
  • each cylinder There may be, at each end of each cylinder, a first check valve controlling entry of liquid into the cylinder and a second check valve controlling flow of pumped liquid to the associated outlet, the first check valve being open when the second check valve is closed and vice versa.
  • the check valves can include valve closures loaded by springs made of plastics material, and the pistons themselves may be made of plastics material.
  • seals are provided to seal a central region of each piston from working ends thereof which contact the liquid in use, seals being provided in the cylinders to seal the central region of each piston from its working ends.
  • a vent passage for venting to the outside of the pump casing, liquid which penetrates the seals.
  • the invention extends to the use of a multi-cylinder piston pump as summarised above when used to distribute liquid fertiliser and, in particular, when mounted on an agricultural vehicle and used to distribute liquid fertiliser, at least some outlets of the pump in such application being connected to spaced apart, independent fertiliser distribution nozzles of the vehicle.
  • a method of distributing liquid fertiliser on an agricultural land comprising the steps of moving a vehicle having a ground-engaging wheel over the land so that the ground-engaging wheel rotates, the vehicle having mounted thereon a multi-cylinder piston pump according to claim 5, driving the cam of the pump in rotation off the land-engaging wheel and directing liquid pumped by the pump from the outlets of the pump to independent, spaced apart distribution nozzles which direct the liquid onto the land.
  • Figure 1 shows a perspective view of a cam used in a multi- cylinder piston pump according to this invention
  • Figure 2 shows a cross-sectional view through a multi-cylinder piston pump according to the invention, the cross- section being at a position indicated by the line 2-2 in Figure 1;
  • Figure 3 shows a cross-section at the line 3-3 in Figure 2;
  • Figure 4 shows a cross-section at the line 4-4 in Figure 2;
  • Figure 5 shows a view, corresponding to that of Figure 2, of another embodiment of the invention.
  • FIG. 2 illustrates a multi-cylinder piston pump 10 which is suitable for accurately pumping liquid agricultural fertiliser. It will however be understood that the pump 10 could be used in many other applications other than pumping of agricultural fertiliser.
  • the pump 10 has a casing 12 including an inlet 14 leading to an internal pump cavity 15. In the specific application of pumping agricultural fertiliser, the inlet 14 will be fed through a suitable conduit from a header tank charged with the liquid fertiliser in question.
  • the cam has a circular disc 19 formed with a holed boss 20 through which the shaft passes and which is fastened to the shaft by a screw 22.
  • the outer surface of the disc 18 carries an outwardly directed projection 24 which has a smooth waviform profile as illustrated. In the illustrated case, the projection varies in a generally sinusoidal manner about a central plane of the disc.
  • the disc, boss and projection are integrally machined or cast.
  • Each aligned pair of cylinders accommodates a double-acting piston 30.
  • Each piston 30 has bore 32 extending into it from either end and is sealed with respect to the cylinder by O-rings 34. At their inner ends, the bores 32 intersect cross-bores 36 extending diametrically through the piston. At a position centrally along its length, each piston is formed with a tapered annular recess 38 which has a shape complemental to that of the projection 24 of the cam 18.
  • Each bore 32 has a stepped cross-section and includes an internal shoulder acting as a valve seat. Valve closures 40 are biased inwardly against the valve seats by compression springs, as illustrated, and act as one-way check valves.
  • each cylinder 28 accommodates a plug 46 formed with a bore 48.
  • Each bore 48 has a stepped cross-section and presents an internal shoulder acting as a valve seat against which a valve closure 50 acting as a one-way check valve is biased by a compression spring as shown.
  • the bores 48 in the plugs 46 on the left hand side of Figure 2 open into transverse passages 52 (see also Figure 3) which communicate with return bores 54 leading to transverse passages 56 at the right hand side.
  • the bores 48 in the plugs 46 on the right hand side of Figure 2 open into the transverse passages 56.
  • the transverse passages 56 communicate with the bores 48 in both the left and right hand plugs 46.
  • the passages 56 also communicate with outlets 58 in the right hand end wall of the pump casing which are aligned with the bores 48, and there is one such outlet 58 for each pair of cylinders 28.
  • the passages 56 communicate with return bores 60 leading to return inlets 62 in the casing structure which communicate with the interior of the pump cavity 15. As shown in Figure 2 the communication between a transverse passage 56 and the associated return bore 60 is normally blocked by an elongate plug 64 screwed into the right hand end wall of the pump casing from the exterior.
  • the operation of the illustrated pump is as follows, assuming that the inlet 14 is connected to a source of liquid such as liquid fertiliser and the pump cavity 15 is full of such liquid.
  • An external rotary drive (not shown) is applied to the shaft 16 to rotate the cam 18.
  • the shaft drive will typically be a mechanical drive operating off a land wheel of the planter which rolls over the ground.
  • the rotary speed of the cam 18 is determined by the rotary speed of the land wheel.
  • the engagement between the cam projection 24 and the pistons 30 and the waviform shape of the projection ensures that as the cam rotates the pistons are caused to reciprocate back and forth in the associated pairs of cylinders 28.
  • the projection 24 has four crests at 90E to one another with four valleys between them. Thus every four pistons which are spaced apart by 9 ⁇ Efrom one another will be in phase with one another.
  • the upper piston in Figure 2 is shown at the right hand end of its travel in the associated cylinders 28 and the lower piston at the left hand end of its travel. The next movement of the upper piston will be to the left. During this movement, the pressure of liquid in the space 64 at the left hand end of the piston 30 increases to a level which opens the valve closure 50. The associated valve closure 40 remains closed and liquid is expelled from the space 64 through the associated passage 52, return bore 54 and passage 56 to the outlet 58. At the same time, the corresponding space at the other end of the piston expands and the reduced pressure therein opens the associated valve closure 40 against its spring bias so that liquid is drawn into that space from the cavity 15 through the bores 36 and 32.
  • the pistons are double acting so as to pump liquid both on both forward and rearward strokes, and that on each full cycle by each piston similar volumes of liquid are pumped from the ends of the piston to the associated outlet 58.
  • the twelve pistons pump twenty-four volumes of liquid to the twelve outlets 58.
  • each of the twelve outlets 58 can be connected to a separate one of twelve distribution nozzles on the planter, so that each nozzle is supplied accurately with the same liquid volume. Because the pump acts with positive displacement of liquid, the volume of liquid delivered to the distribution nozzles remains constant, irrespective of the static head in the header tank.
  • the rotary speed of the cam which determines the flow rate through each outlet, is itself determined by the speed of the land wheel of the planter, the delivery of fertiliser by the pump is automatically determined by the velocity of the planter. A higher planter velocity results in a higher cam speed and accordingly a higher delivery flow rate, and vice versa. In the result, it can be expected that there will be constant and accurate delivery of fertiliser to each delivery site connected to an outlet 58.
  • Some planters may have less than twelve distribution nozzles. In this case, it is a simple matter to eliminate the required number of outlets 58. This is achieved by screwing stop plugs (not shown) into those outlets from which liquid delivery is not required, and removing the associated plugs 64. This prevents liquid pumped by the relevant pistons from passing through the associated outlet. Instead, the pumped liquid will be returned to the cavity 15 via the relevant passages 56, return bores 60 and inlets 62. Pumped liquid is delivered only through those outlets 58 which are open.
  • pistons 30 do not have to be double-acting.
  • Single-acting pistons could equally well be driven by a cam of the type described above. In this case, there would be a single cylinder for each piston.
  • Figure 5 illustrates another, currently preferred embodiment which operates in similar manner to the first embodiment described above.
  • Components in Figure 5 corresponding to components of the first embodiment are designated with the same reference numerals.
  • pumps according to the invention may have to handle fertiliser and other liquids of a highly corrosive nature.
  • components of the pump which are in contact with the liquid are preferably made of corrosion resistant material.
  • stainless steel or other suitable materials may be used.
  • the pistons are made of a suitable plastics material and slide in cast iron sleeves 74 which are isolated from the liquid by seals 76.
  • the valve closures 40 and 50 as well as the springs which bias them are also made of suitable corrosion resistant plastics material.
  • the pump includes a narrow passage 80 which serves to vent liquid to the exterior of the pump rather than permitting leakage thereof past the seals 76 into contact with the sleeves 74.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à piston multicylindre (10), comprenant une came (18) conçue pour pivoter autour d'un axe et une série de pistons de pompage (30) à mouvement alternatif, placés dans des cylindres (28) espacés autour de l'axe de ladite came. Cette came (18) présente une structure périphérique ondulée (24), destinée à entrer en contact avec lesdits pistons (30) afin d'amener ceux-ci à adopter un mouvement alternatif dans leurs cylindres (28), une fois que ladite came (18) pivote.
PCT/IB1999/000550 1998-04-03 1999-03-31 Pompe a piston multicylindre WO1999051880A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28489/99A AU2848999A (en) 1998-04-03 1999-03-31 Multi-cylinder piston pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA982855 1998-04-03
ZA98/2855 1998-04-03

Publications (2)

Publication Number Publication Date
WO1999051880A2 true WO1999051880A2 (fr) 1999-10-14
WO1999051880A3 WO1999051880A3 (fr) 1999-12-29

Family

ID=25586934

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000550 WO1999051880A2 (fr) 1998-04-03 1999-03-31 Pompe a piston multicylindre

Country Status (2)

Country Link
AU (1) AU2848999A (fr)
WO (1) WO1999051880A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249602A2 (fr) * 2001-04-12 2002-10-16 Robert Bosch Gmbh Pompe pour carburants alternatifs
EP2031247A1 (fr) * 2007-08-31 2009-03-04 Pfizer Inc. Pompe liquide
WO2016035037A1 (fr) * 2014-09-04 2016-03-10 Geldenhuys Leon Basil Système d'application d'un liquide agricole
CN114215714A (zh) * 2022-01-05 2022-03-22 多普医疗科技(郑州)有限公司 一种流体输送计量系统及流体输送装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105265084B (zh) * 2015-11-13 2017-03-29 江苏大学 一种水力驱动的定比例施肥泵

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB610428A (en) * 1946-04-04 1948-10-15 Charles Edgar Channing Improvements in and relating to reciprocating pumps
US3143076A (en) * 1962-10-11 1964-08-04 George L Pyritz Constant pressure, variable volume delivery pump
NL6512379A (fr) * 1965-09-23 1967-03-28
NL6901096A (fr) * 1969-01-23 1970-07-27
US3692052A (en) * 1970-03-27 1972-09-19 Hamish A G Cattanach Pressure controlled variable pump output by-pass system
DE3507014A1 (de) * 1985-02-28 1986-08-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
FR2660021B1 (fr) * 1990-03-26 1992-07-10 Craf Pompe modulaire a plusieurs sorties alimentees chacune par un element de pompage.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249602A2 (fr) * 2001-04-12 2002-10-16 Robert Bosch Gmbh Pompe pour carburants alternatifs
EP2031247A1 (fr) * 2007-08-31 2009-03-04 Pfizer Inc. Pompe liquide
WO2009027809A2 (fr) * 2007-08-31 2009-03-05 Pfizer Inc. Pompe à liquides
WO2009027809A3 (fr) * 2007-08-31 2009-09-24 Pfizer Inc. Pompe à liquides
KR101181084B1 (ko) * 2007-08-31 2012-09-07 화이자 인코포레이티드 액체 펌프
WO2016035037A1 (fr) * 2014-09-04 2016-03-10 Geldenhuys Leon Basil Système d'application d'un liquide agricole
CN114215714A (zh) * 2022-01-05 2022-03-22 多普医疗科技(郑州)有限公司 一种流体输送计量系统及流体输送装置
CN114215714B (zh) * 2022-01-05 2024-05-03 多普医疗科技(郑州)有限公司 一种流体输送计量系统及流体输送装置

Also Published As

Publication number Publication date
AU2848999A (en) 1999-10-25
WO1999051880A3 (fr) 1999-12-29

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