EP0455696B1 - Positive-displacement pump - Google Patents

Positive-displacement pump Download PDF

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Publication number
EP0455696B1
EP0455696B1 EP90902412A EP90902412A EP0455696B1 EP 0455696 B1 EP0455696 B1 EP 0455696B1 EP 90902412 A EP90902412 A EP 90902412A EP 90902412 A EP90902412 A EP 90902412A EP 0455696 B1 EP0455696 B1 EP 0455696B1
Authority
EP
European Patent Office
Prior art keywords
pump
outlet
pump chamber
chamber
inlet
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
Application number
EP90902412A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0455696A1 (en
Inventor
Stig Lundbäck
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.)
Humanteknik AB
Original Assignee
Humanteknik AB
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 Humanteknik AB filed Critical Humanteknik AB
Publication of EP0455696A1 publication Critical patent/EP0455696A1/en
Application granted granted Critical
Publication of EP0455696B1 publication Critical patent/EP0455696B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0027—Special features without valves
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0018—Special features the periphery of the flexible member being not fixed to the pump-casing, but acting as a valve

Definitions

  • This invention relates to a positive-displacement pump and more particularly to a positive-displacement pump, comprising: (I) a submersible pump housing having at the lower portion thereof an inlet for liquid to be pumped, having at the upper portion thereof an outlet for liquid being pumped, and having a variable volume pump chamber communicating with the inlet and the outlet, (II) a pumping mechanism including a displacement member which is disposed in the pump housing and movable therein, and a driving device by means of which the displacement member can be actuated to reduce repetitively the volume of the pump chamber and which comprises a lifting member connected with the displacement member, (III) a one-way inlet valve provided between the inlet and the pump chamber, and (IV) a one-way outlet valve provided between the pump chamber and the outlet.
  • the pump according to the invention is useful as a submersible pump, i.e. a pump submerged in the body of liquid from which the liquid being pumped is taken and, accordingly, a pump which operates without suction head.
  • the pump may be lowered below the water level in a well, a pond or other water supply or in a tank or other liquid reservoir from which water is to be taken by means of the pump.
  • An object of the invention is to provide a simple and inexpensive submersible positive-displacement pump the pump chamber of which can be filled very rapidly by gravity flow from the surrounding body of water.
  • the pump is primarily characterised in that the inlet communicates with the pump chamber by way of an annular gap between the displacement member and a circumferentially extending pump housing side wall which defines the pump chamber, and in that the one-way inlet valve includes a flexible sealing collar which bridges the annular gap throughout the circumferential extension thereof and one circumferential end of which is sealingly affixed to the pump housing or the sealing member and the other circumferential end of which is movable in the pump chamber towards and away from the said pump housing wall under the influence of a pressure differential between the inlet and the pump chamber.
  • the illustrated pump is adapted for use as a well pump and, more particularly, is intended to be lowered to a position below the water table in a drilled well.
  • the pump comprises a housing which is circular in cross-section and comprised of a base part 10A and a top part 10B secured to the base part.
  • the base part 10A forms a generally cylindrical cage into which water may flow freely (without any significant pressure drop) from the body of water in which the pump is submerged. Openings 11 through which the water enters may be provided with a straining cloth (not shown) or may themselves form strainer apertures in the side wall of the base part.
  • a waist 13 is formed in the upper portion of the base part and retains within it the lower portion of the top part 10B; to this end the lower portion of the top part is provided with a complemental waist 14.
  • the waist 14 may readily be positioned within the waist 13 of the base part, the last-mentioned waist may be split so that it can readily be expanded.
  • a retaining ring 15 applied after the top part 10B has been mounted secures the top part reliably.
  • the waist 14 of the top part merges upwardly with an intermediate portion 16 which initially widens and then tapers upwardly towards.an outlet throat 17.
  • a riser tube or hose 18 is connected to the latter.
  • the intermediate portion 16 defines an outlet chamber 19 which chamber communicates with the base part 10A by way of the central circular opening 20 defined by the waist 14 of the top part.
  • a pump chamber 21 is provided in the pump housing 10A/10B. Laterally or horizontally, the pump chamber is defined partly by the inner side 22 of the lower portion of the waist 14 and partly by a sealing collar 23 which forms part of a bowl-shaped body 24 of flexible material and serves as an inlet valve. The bottom wall 25 of the bowl-shaped body 24 is domed and delimits the pump chamber downwardly.
  • the rotationally symmetrical sealing collar 23 when viewed in axial diametrical section, has an arcuate, outwardly convex contour such that the largest diameter of the collar is about halfway between the upper, free end or rim 23A of the collar and the lower end 23B which merges with the bottom wall 25 and such that the two ends 23A, 23B are of approximately equal diameters.
  • the shape and dimensions of the sealing collar 23 and the properties of the material the collar is made of are chosen and matched such that the collar moves away inwardly from the pump housing wall 22 as soon as the pressure of the liquid surrounding the collar exceeds the pressure within the pump chamber and is moved into sealing engagement with the surrounding pump housing wall 22 as soon as the pressure of the liquid within the pump chamber exceeds the pressure outside it. In other words, a very small pressure differential across the collar is sufficient to open or close the flow passage controlled by the collar.
  • the material of the collar has to possess such a strength and such a degree of inextensibility that the collar can endure the hydrostatic pressure resulting from the column of water in the riser hose.
  • Some elasticity of the material may be advantageous, but preferably at least the top or free end 23 is extendable only to a small extent.
  • the bowl-shaped body 24 which preferably is made of plastic by blow moulding, vacuum moulding or any other suitable process for making thin-walled plastic articles, is supported by, and preferably is secured to, the upper side of a displacement member in the form of a relatively heavy body 27 which is vertically movable in the base part 10A of the pump housing.
  • This body serves during its upward movement to contract the pump chamber 21, and thereby to displace liquid therein upwardly through the opening 20, and during its downward movement to cause the pump chamber to expand.
  • the displacement member 27 in turn is supported by a lifting element 28 in the form of a rod or cable extending centrally upwardly through the pump housing 10A/10B, the outlet throat 17 of the pump housing and the riser hose 18 to a driving device D which is not shown in detail.
  • a lifting element 28 in the form of a rod or cable extending centrally upwardly through the pump housing 10A/10B, the outlet throat 17 of the pump housing and the riser hose 18 to a driving device D which is not shown in detail.
  • the lifting element 28 and, accordingly, the displacement member 27 are reciprocated vertically over a certain distance in operation of the pump.
  • Abutments may be provided on the pump housing to limit the vertical movement in both directions.
  • the displacement member 27 varies the height, and thereby the flow-through cross-sectional area, of the annular gap 29 which is defined by the displacement member and the pump housing wall 22 and which is bridged by the sealing collar 23.
  • the gap 29 is wide enough to permit filling of the pump chamber 21 rapidly and substantially with no pressure drop
  • an outlet valve member 30 which is slidably movable along the lifting member 28 and comprises a tubular stem 31 and a valve disc 32 made integrally with the lower portion of the stem.
  • the valve disc 32 is adapted to be in sealing engagement with the inner side 33 of the upper portion of the waist 14 of the housing part 10B under the influence of the weight of the valve member and the hydrostatic pressure in the outlet chamber 19 when that pressure exceeds the pressure in the pump chamber 21.
  • the valve member 30 may be made of any suitable material, such as plastic, of greater density than water.
  • the pump is lowered to a position some distance below the water table in a well pipe or well hole B the wall of which is indicated by vertical phantom lines in the drawing.
  • the pump housing is clamped against the wall of the tube or hole at the intermediate portion 16 of the top part 10B of the pump housing under the influence of the hydro-static pressure in the pump housing resulting from the column of liquid in the riser hose 18.
  • the intermediate portion 16 can be expanded elastically in the radial direction.
  • the intermediate portion 16 of the pump housing is formed with vertical grooves defining passages which extend between the upper and lower end of the intermediate portion and are always open.
  • Fig. 1 shows the pump in a phase of operation in which the lifting member 28, and thus the displacing member 27 and the bowl-shaped body 24, are near the end point of the downward stroke. Accordingly, the pump chamber 21 approaches its condition of maximum volume, but water may still enter the pump chamber through the housing openings 11 and the annular passage 34 between the pump housing wall 22 and the sealing collar 23. The pressure resulting from the overlying column of liquid maintains the valve member 30 in closed position against the valve seat formed by the wall 33.
  • valve member 30 When the lifting member 28 and the displacement member 27 are then allowed to move downwardly, the valve member 30 again closes against the seat 33 so that the pump chamber 21 is isolated from the hydrostatic pressure in the outlet chamber 19.
  • the water around the pump housing 10A/10B can therefore displace the upper portion of the sealing collar 23 inwardly and flow through the annular passage 34 into the pump chamber 21 with substantially no pressure drop (see Fig. 1).
  • the passage 34 opens over a very large flow-through cross-sectional area. Since, in addition, the flow path of the water is very short, the pump chamber 21 is filled very rapidly; for practical purposes the filling time may always be taken as equal to the time the displacement member requires for its downward stroke. In practice, the pump can therefore always operate without filling problems at the rate at which the driving device is capable of moving the lifting member and the displacement member. Because the horizontal cross-sectional area of the pump chamber 21 can be nearly as large as the interior cross-sectional area of the base part 10A of the pump housing, the stroke volume may be large even when the stroke length is short.
  • the pump housing wall 22 serves as a stationary valve seat which coacts with the reciprocating sealing collar 23.
  • This arrangement is normally preferred, but it is possible within the scope of the invention to affix the sealing collar 23 to the pump housing wall 22 and arrange for its lower annular end 23B to coact with the displacement member 27 which then serves as a movable valve seat.
  • the sealing collar 23 is affixed to the pump housing wall 22 and arrange for its lower annular end 23B to coact with the displacement member 27 which then serves as a movable valve seat.
  • other modifications are also possible within the scope of the invention.
  • water may slowly leak between the valve member 30 and the lifting member 28 under the influence of the hydrostatic pressure resulting from the column of water in the riser hose 18.
  • This leakage is not sufficient, however, to increase the pressure within the pump chamber 21 and thereby cause the sealing collar 23 to engage the pump housing wall 22. Instead, the leaking water may flow past the sealing collar into the body of water around the pump.
  • the water column in the riser hose 18 may therefore sink slowly so that the pressure in the outlet chamber 19 is equalised and the clamping of the intermediate portion 16 against the wall of the well tube or well hole gradually disappears.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP90902412A 1989-01-24 1990-01-24 Positive-displacement pump Expired - Lifetime EP0455696B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8900237 1989-01-24
SE8900237A SE467795B (sv) 1989-01-24 1989-01-24 Deplacementpump foer vaesentligen vertikal uppfordring av vaetska

Publications (2)

Publication Number Publication Date
EP0455696A1 EP0455696A1 (en) 1991-11-13
EP0455696B1 true EP0455696B1 (en) 1993-08-04

Family

ID=20374835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90902412A Expired - Lifetime EP0455696B1 (en) 1989-01-24 1990-01-24 Positive-displacement pump

Country Status (10)

Country Link
EP (1) EP0455696B1 (pt)
JP (1) JPH04503985A (pt)
AT (1) ATE92593T1 (pt)
AU (1) AU631181B2 (pt)
BR (1) BR9007049A (pt)
DE (1) DE69002613T2 (pt)
DK (1) DK0455696T3 (pt)
ES (1) ES2044558T3 (pt)
SE (1) SE467795B (pt)
WO (1) WO1990008898A1 (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5527164A (en) * 1990-06-07 1996-06-18 Humanteknik Ab Positive-displacement pump with inlet float chamber
TW265430B (en) * 1994-06-30 1995-12-11 Intel Corp Ducted opposing bonded fin heat sink blower multi-microprocessor cooling system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE875142C (de) * 1944-04-22 1953-04-30 Messerschmitt A G Fluessigkeitsfoerdereinrichtung
JPS57153978A (en) * 1981-03-17 1982-09-22 Nitsusaku:Kk Pump for deep well
SE8600190L (sv) * 1986-01-16 1987-07-17 Olofsson Bjoern Pumpanordning, speciellt for att pumpa vatten ur djupa brunnar

Also Published As

Publication number Publication date
AU4952590A (en) 1990-08-24
AU631181B2 (en) 1992-11-19
DE69002613D1 (de) 1993-09-09
ES2044558T3 (es) 1994-01-01
BR9007049A (pt) 1991-11-05
SE8900237D0 (sv) 1989-01-24
SE467795B (sv) 1992-09-14
ATE92593T1 (de) 1993-08-15
EP0455696A1 (en) 1991-11-13
WO1990008898A1 (en) 1990-08-09
DE69002613T2 (de) 1994-01-13
DK0455696T3 (da) 1993-12-27
JPH04503985A (ja) 1992-07-16
SE8900237L (sv) 1990-07-25

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