EP1972783B1 - Dosierpumpe, deren eine Wand oder hinterer Flansch der Dosierkammer mit einer isolierenden Membran ausgestattet ist - Google Patents

Dosierpumpe, deren eine Wand oder hinterer Flansch der Dosierkammer mit einer isolierenden Membran ausgestattet ist Download PDF

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Publication number
EP1972783B1
EP1972783B1 EP08290218A EP08290218A EP1972783B1 EP 1972783 B1 EP1972783 B1 EP 1972783B1 EP 08290218 A EP08290218 A EP 08290218A EP 08290218 A EP08290218 A EP 08290218A EP 1972783 B1 EP1972783 B1 EP 1972783B1
Authority
EP
European Patent Office
Prior art keywords
pump
sheet
fluid
chamber
side plate
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.)
Not-in-force
Application number
EP08290218A
Other languages
English (en)
French (fr)
Other versions
EP1972783A1 (de
Inventor
Rémy Lefebvre
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.)
Milton Roy Europe SA
Original Assignee
Milton Roy Europe SA
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 Milton Roy Europe SA filed Critical Milton Roy Europe SA
Publication of EP1972783A1 publication Critical patent/EP1972783A1/de
Application granted granted Critical
Publication of EP1972783B1 publication Critical patent/EP1972783B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • the invention relates to a pump for the dosing of an extremely corrosive product.
  • Such a pump conventionally comprises a pump head which defines a pumping chamber, that is to say a variable volume chamber by deformation or displacement of a wall of the head.
  • This chamber is secured to a frame that supports the pump head and the driving members coupled to the movable or deformable wall.
  • the aggressiveness of the pumped fluid leads to the use of noble materials for the parts in contact with the fluid: stainless steels, special alloys, titanium, etc. which are particularly expensive.
  • the most common structure of a pump head consists of a thick disk-shaped piece, hollowed out to define a concave cap that forms the pumping chamber on which the valve boxes are implanted. This cap is closed by the membrane, pinched between the workpiece and the frame of the pump.
  • the hollow part is a part that offers a large surface in contact with the pumped fluid. It is also a massive piece that, when it must be made of highly chemically unassailable material, is extremely expensive.
  • the coating of the surface of this part turned towards the pumping chamber by means of either a kind of vulcanization (cf. US2,753,804 ) or by a kind of skin, for example polyethylene tetrafluoride formed by molding and held by clipping into the pumping chamber (see US 3,000,320 ).
  • the preamble of independent claim 1 is based on the document US 3000,320 .
  • the invention proposes to solve the question of the passivation of this surface exposed to the pumped fluid, by proposing a coating of this surface by means of a skin perfectly coapted to the shape of the surface to be protected so that no degradation of mechanical origin or as a result of fatigue over time, can not affect this protection.
  • the subject of the invention is therefore a pump, in particular for chemically reactive fluid, in which a pump head comprises at least two walls between which is defined a pumping chamber for the fluid in question, one of the walls being fixed, the other being movable or deformable with respect to the fixed wall by means of a driving or deformation device, the at least one fixed wall being provided with a protective coating with respect to the fluid, characterized in that the coating consists of by a sheet of plastic material, sealingly pressed against the surface at the periphery thereof, the space between the protected surface and the covering sheet, within the line of their sealing contact being filled with an incompressible liquid.
  • the composite material formed of the liquid and the plastic sheet is a non-deformable material under the effect of alternating pressures and depressions that prevail in the chamber. Indeed, the liquid having completely filled the space between the surface and the sheet has chased away any bubble of gas which could, by its compressibility and therefore the variation of its volume, leave a freedom of deformation to the sheet with respect to the wall which it protects, deformation which would have reduced the cubic capacity of the pump and which would have constituted a stress of fatigue of the sheet leading quickly to its tearing.
  • This surface resistance can be imparted to the sheet in at least two different ways.
  • the first is to conform the sheet substantially spherical or conical cap, in congruence with the inner surface of the flange to marry it as accurately as possible, with the convexity of this shape facing the interior of the chamber.
  • the second is to set up a protective plate of the surface of the sheet turned on the side of the pumping chamber, protective plate of noble material having good corrosion resistance.
  • the pump is finally equipped with means for proceeding in a simple and correct way to the mounting of the protective sheet, either at the time of initial assembly of the pump, or at the time of reassembly thereof after regular maintenance operations.
  • These are two orifices which is equipped with the flange, opening in the immediate vicinity of the sealing line between the sheet and the pump head, one in the lowest part and the other in the most important part. top of the pumping chamber, each having a threaded plug for closure.
  • a protective cap of the cap covers each of them and rests on an outer surface of the flange by a bearing face having a sealing O-ring surrounding the plug and housed in a conical bottom groove, allowing the radial expansion of this seal under the effect of a fluid under pressure from the cap and the creation of a leakage of this fluid between the cover and the flange.
  • the pump head shown in figure 1 comprises, in known manner, a cylindrical ring 1 on the left flank of which is reported a flange 2, in the form of solid disc, by means of peripheral screws not shown while its right side is attached to a pump frame 3 which in closes and supports all the motor organs of this one.
  • a deformable membrane 4 is clamped between the crown and the frame.
  • the pumping chamber 5 is thus delimited by the ring 1, the flange 2 and the membrane 4.
  • a valve box 6 constitutes the connection means of the pumping chamber 5 to a suction pipe, not shown, through at least one unidirectional valve passing from the direction A.
  • the discharge of the pump also comprises a valve box 7 with a unidirectional valve whose tail 8 is seen, also passing in the direction A.
  • the membrane 4 is driven by a race suction in the direction B and a discharge stroke in the direction C by means of a hydraulic fluid contained in a chamber of Work 9 which also includes a conventional device 10 for compensating leaks.
  • the flange 2 is pierced with two orifices 22 and 23 which open into the chamber 5, for the one 22, in the lower part of the chamber at the boundary of the zone Z and for the other, in the upper part of the chamber, also at the edge of the zone Z. It is thus possible to introduce between the sheet 20 and the flange 2 a film of incompressible liquid, for example oil from the lower orifice 22.
  • the liquid is forced by means of a pump into this space so as to cause progressive invasion until it comes out of the The upper orifice 23. It is thus certain to have driven out all the interstitial air that remained between the sheet and the flange. These openings are then plugged.
  • the pump is then able to operate without loss of displacement and without mechanical stress and fatigue for the sheet 20.
  • the lower orifice 22 is adapted to receive a threaded plug provided with an O-ring seal 31 and a central channel 32 which opens through a transverse channel 32a in a section 22a of the orifice 22.
  • This section communicates with the final section 22b of this orifice 22 through a seat (shrink) 22c which can be closed by the conical end 30a of the threaded cap 30.
  • the free end of this plug has a six maneuvering faces 30b surmounted by a fir-tail connecting end 30c for the temporary connection of the orifice 22 to a source of pressurized fluid not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (5)

  1. Pumpe, insbesondere für ein chemisch reaktives Fluid, wobei ein Pumpenkopf mindestens zwei Wände (2, 4) umfasst, zwischen denen eine Pumpkammer (5) für das betreffende Fluid definiert ist, wobei eine (2) der Wände ortsfest und die andere (4) gegenüber der ortsfesten Wand (2) mit Hilfe einer Antriebs- oder Verformungsvorrichtung (9) beweglich oder verformbar ist, wobei mindestens die ortsfeste Wand (2) mit einem Schutzüberzug (20) zum Schutz vor dem Fluid versehen ist, wobei der Überzug aus einer Kunststofffolie (20) gebildet ist, die auf dichte Weise auf die ortsfeste Wand (2) an deren Umfang (Z) aufgebracht ist, dadurch gekennzeichnet, dass der Zwischenraum, der zwischen der geschützten Oberfläche (21) und der Überzugsfolie (20) vorhanden ist, innerhalb der Zone (Z) ihres dichten Kontakts mit einer nicht komprimierbaren Flüssigkeit gefüllt ist.
  2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Folie (20) die Form einer im Wesentlichen kugelschalenförmigen oder kegelförmigen Kalotte hat, in Übereinstimmung mit der inneren Oberfläche (21) des Flansches (2), um sich so genau wie möglich daran anzupassen, wobei die Konvexität dieser Form zum Inneren der Kammer (5) gerichtet ist.
  3. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass sie eine Schutzplatte (20b) zum Schutz der Oberfläche der Folie (20a) umfasst, die zu der Pumpkammer hin weist.
  4. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie Mittel zum Durchführen des Befüllens des Zwischenraums zwischen dem Flansch (2) und der Folie (20, 20a) mit Fluid umfasst, die aus zwei Öffnungen (22, 23) gebildet sind, mit denen der Flansch (2) ausgestattet ist und die in unmittelbarer Nähe der Abdichtungszone (Z) zwischen der Folie (20, 20a) und dem Pumpenkopf münden, eine (22) in dem untersten Teil und die andere (23) in dem obersten Teil der Pumpkammer (5), wobei jede einen Schraubverschluss (30, 35) für ihr Verschließen umfasst.
  5. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Schutzkappe (40) zum Schutz des Verschlusses (30, 35) jeden der Verschlüsse abdeckt und auf einer Außenfläche des Flansches (2) über eine Anlagefläche aufliegt, die eine O-Ring-Dichtung (41) umfasst, die den Verschluss (30, 35) umgibt und in einer Nut (42) mit einem konischen Boden (43) angeordnet ist, die die radiale Ausdehnung dieser Dichtung (41) unter der Wirkung eines vom Verschluss stammenden Druckfluids und die Erzeugung eines Leckstroms dieses Fluids zwischen der Kappe (40) und dem Flansch (2) ermöglicht.
EP08290218A 2007-03-13 2008-03-06 Dosierpumpe, deren eine Wand oder hinterer Flansch der Dosierkammer mit einer isolierenden Membran ausgestattet ist Not-in-force EP1972783B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0701786A FR2913732B1 (fr) 2007-03-13 2007-03-13 Pompe de dosage a membrane isolante d'une de ses parois ou flasque d'extremite de la chambre de dosage

Publications (2)

Publication Number Publication Date
EP1972783A1 EP1972783A1 (de) 2008-09-24
EP1972783B1 true EP1972783B1 (de) 2010-05-12

Family

ID=38581918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08290218A Not-in-force EP1972783B1 (de) 2007-03-13 2008-03-06 Dosierpumpe, deren eine Wand oder hinterer Flansch der Dosierkammer mit einer isolierenden Membran ausgestattet ist

Country Status (5)

Country Link
US (1) US7836814B2 (de)
EP (1) EP1972783B1 (de)
DE (1) DE602008001184D1 (de)
ES (1) ES2344489T3 (de)
FR (1) FR2913732B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112309150B (zh) * 2020-12-07 2021-12-28 吉安市永安交通设施有限公司 一种可移动式交通信号灯

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496711A (en) * 1946-11-02 1950-02-07 Daniel And Florence Guggenheim Pumping apparatus for very cold liquids
US2753804A (en) * 1951-09-26 1956-07-10 Int Paper Box Machine Co Diaphragm pump
US3000320A (en) * 1957-07-18 1961-09-19 Ring Sandiford Pump
US3212448A (en) * 1963-04-22 1965-10-19 Clevite Corp Fluid apparatus
US3781141A (en) * 1971-07-12 1973-12-25 Dorr Oliver Inc Air pressure actuated single-acting diaphragm pump
GB1433758A (en) * 1973-10-23 1976-04-28 Hamilton T W Membrane pump
DE8525733U1 (de) * 1985-09-10 1987-01-15 Becker, Erich, 7812 Bad Krozingen Membranpumpe
DE10012902B4 (de) * 2000-03-16 2004-02-05 Lewa Herbert Ott Gmbh + Co. Atmungsfreie Membraneinspannung

Also Published As

Publication number Publication date
US7836814B2 (en) 2010-11-23
US20080226478A1 (en) 2008-09-18
FR2913732A1 (fr) 2008-09-19
FR2913732B1 (fr) 2012-08-17
DE602008001184D1 (de) 2010-06-24
EP1972783A1 (de) 2008-09-24
ES2344489T3 (es) 2010-08-27

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