EP0354883A1 - Pumping device for particularly abrasive slurries - Google Patents

Pumping device for particularly abrasive slurries Download PDF

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Publication number
EP0354883A1
EP0354883A1 EP89830355A EP89830355A EP0354883A1 EP 0354883 A1 EP0354883 A1 EP 0354883A1 EP 89830355 A EP89830355 A EP 89830355A EP 89830355 A EP89830355 A EP 89830355A EP 0354883 A1 EP0354883 A1 EP 0354883A1
Authority
EP
European Patent Office
Prior art keywords
chamber
abrasive
slurries
aggres
sive
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.)
Withdrawn
Application number
EP89830355A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ivo Ognibene
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.)
Ansaldo SpA
Original Assignee
Ansaldo SpA
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 Ansaldo SpA filed Critical Ansaldo SpA
Publication of EP0354883A1 publication Critical patent/EP0354883A1/en
Withdrawn legal-status Critical Current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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the second type has problems concerning wear of the seals, and requires special arrangements for continuous flushing with water.
  • the purpose of this invention is to overcome these drawbacks by eliminating all contact between the abrasive mixture in question and the reciprocally mobile stiff parts of the pumping device.
  • this aim is achieved by in­serting into the body of the pump a sealed flexible bag, so that the inside volume of the pump body is split up into two cavities: the first is connected to the intake and delivery ducts for the abrasive liquid, and it contains no stiff moving parts; the second con­tains a non-abrasive liquid, such as water, oil, glycerin or another similar liquid; the pumping effect is brought about by means for moving the flexible membrane causing a cyclic variation of the volume of the first chamber in both directions.
  • movement of the flexible membrane is obtained by means of a plung­ing piston which acts inside said second chamber.
  • a second form of embodiment calls instead for said second chamber to be connected alternately to means which force in and out the non-abrasive liquid con­tained in said second chamber.
  • 10 indicates a pump body equipped with an intake duct 11 and a delivery duct 12 for an abrasive liquid 13. These ducts are fitted with suitable check valves not shown in the drawing.
  • the pump body 10 is closed at the top by a cover 14 with a central hole fitted with a seal through which a plunging piston 15 passes. Between the cover 14 and the upper edge of the pump body 10 the outer rim 16 of a flexible and sealed bag 20 is tightened to form a seal.
  • the bag thus divides the inside volume of the pump body 10 into two chambers, one outer chamber indicated as 21 in which the abrasive liquid 13 is contained, and one inner chamber, 22, on the same axis as the first, in which a non-abrasive liquid 23 such as water, oil, glycerin and so on is contained.
  • a sealing ring 24 is arranged on top of the cover, around the hole through which the plunging piston 15 passes.
  • the liquid 23 inside the tank 26 functions as a reserve and means of controlling the sealing of the ring 24, as explained further below.
  • FIG. 2 again there are a pump body 10, intake and delivery ducts 11 and 12, and the sealed flexible bag 20; there is also a cover 114, through which a rod 117 passes through a sealing ring 124.
  • the inside volume of the pump body 10 is split up into two chambers 21 and 122 by the flexible bag 20.
  • the volume of the inner chamber 122 is not constant but variable, thanks to a duct 30 which cyclically forces in and out of the inner chamber 122 a predetermined quantity of non-abrasive liquid.
  • the suggested system provides the following advantages as compared to the currently used pumps: - lack of wear of parts submerged in the aggressive fluid, due to the absence of contact, and therefore of rubbing, between them; - very limited wear of the pumping element, that is to say the bag 20, on the aggressive fluid side, due to the low relative speeds of the fluid and the bag itself; - the mechanical resistance of the flexible pumping bag is very high since this is always at a balanced pressure; - the dynamic seals are of a conventional type, since they come into contact with a non-aggressive fluid; - ease of maintenance and replacement of worn parts, with consequent reduced stopping times; - no blowby of the liquid to be pumped from the delivery to the intake; - possibility of making either high-delivery low-head pumps for transferring or moving large masses or high-­ head pumps required, for example, for the thrust of coal-water slurry towards the burners.
  • the flexible membrane may be of any shape; - the membrane may be made of any metallic or non-­metallic material; - the pumping organ for the non-aggressive fluid may be either inside the membrane (as shown in figure 1) or outside it (as shown in figure 2); - the intake and delivery valves may be automatic or controlled, and may be located either inside the pump body or on line on the relevant pipe-lines; - the flow rate may be adjustable either by varying the actual average speed of the pumping organ or by varying the travel; - the pump body may have any number of cylinders and any specific piston displacement; - the non-aggressive fluid may be any fluid, as long as it is incompressible; - the power operation of the plunging piston in the version illustrated in figure 1 may be either mechani­cal (i.e.
  • the four-way two-position valve in the version il­lustrated in figure 2 may be of any type and may be fitted either in a fixed position or solid with the central rod, as in servo controls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP89830355A 1988-08-10 1989-08-01 Pumping device for particularly abrasive slurries Withdrawn EP0354883A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8812536A IT1225682B (it) 1988-08-10 1988-08-10 Dispositivo di pompaggio di miscele liquido-solide particolarmente abrasive
IT1253688 1988-08-10

Publications (1)

Publication Number Publication Date
EP0354883A1 true EP0354883A1 (en) 1990-02-14

Family

ID=11141308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830355A Withdrawn EP0354883A1 (en) 1988-08-10 1989-08-01 Pumping device for particularly abrasive slurries

Country Status (9)

Country Link
EP (1) EP0354883A1 (da)
JP (1) JPH0275780A (da)
DE (1) DE354883T1 (da)
DK (1) DK349989A (da)
ES (1) ES2015840A4 (da)
GR (1) GR900300105T1 (da)
IT (1) IT1225682B (da)
PL (1) PL161088B1 (da)
PT (1) PT91222A (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6568925B2 (en) 2001-03-28 2003-05-27 Eric Gunderson Abrasive liquid pump apparatus and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1445092A (en) * 1991-03-18 1992-10-21 Nordson Corporation Method for pumping liquid by multiple plunger pump and pump therefor
US6935013B1 (en) 2000-11-10 2005-08-30 Hitachi Global Storage Technologies Netherlands B.V. Apparatus and method for precise lapping of recessed and protruding elements in a workpiece

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB597106A (en) * 1945-08-09 1948-01-19 Norman Emile Mcclelland Improvements in or relating to diaphragm pumps
CH345800A (de) * 1955-09-22 1960-04-15 Reiners Walter Dr Ing Membranpumpe für nichtschmierende und chemisch aggressive Flüssigkeiten
GB875509A (en) * 1957-11-27 1961-08-23 Milton Roy Co Improvements in hydraulically actuated pumps
GB887774A (en) * 1959-06-26 1962-01-24 Charles Wilfred Simpson Improvements in and relating to diaphragm pumps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB597106A (en) * 1945-08-09 1948-01-19 Norman Emile Mcclelland Improvements in or relating to diaphragm pumps
CH345800A (de) * 1955-09-22 1960-04-15 Reiners Walter Dr Ing Membranpumpe für nichtschmierende und chemisch aggressive Flüssigkeiten
GB875509A (en) * 1957-11-27 1961-08-23 Milton Roy Co Improvements in hydraulically actuated pumps
GB887774A (en) * 1959-06-26 1962-01-24 Charles Wilfred Simpson Improvements in and relating to diaphragm pumps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6568925B2 (en) 2001-03-28 2003-05-27 Eric Gunderson Abrasive liquid pump apparatus and method

Also Published As

Publication number Publication date
PL161088B1 (pl) 1993-05-31
ES2015840A4 (es) 1990-09-16
JPH0275780A (ja) 1990-03-15
DK349989D0 (da) 1989-07-14
IT8812536A0 (it) 1988-08-10
DE354883T1 (de) 1990-10-18
IT1225682B (it) 1990-11-22
DK349989A (da) 1990-02-11
PT91222A (pt) 1990-03-08
GR900300105T1 (en) 1991-09-27

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