EP2058517B1 - Pumpe - Google Patents

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Publication number
EP2058517B1
EP2058517B1 EP07120132A EP07120132A EP2058517B1 EP 2058517 B1 EP2058517 B1 EP 2058517B1 EP 07120132 A EP07120132 A EP 07120132A EP 07120132 A EP07120132 A EP 07120132A EP 2058517 B1 EP2058517 B1 EP 2058517B1
Authority
EP
European Patent Office
Prior art keywords
membrane
inner chamber
pump
cavity
fluid
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
EP07120132A
Other languages
English (en)
French (fr)
Other versions
EP2058517A1 (de
Inventor
Carlo Alberto Cuneo
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.)
Idromeccanica Bertolini SpA
Original Assignee
Idromeccanica Bertolini 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 Idromeccanica Bertolini SpA filed Critical Idromeccanica Bertolini SpA
Priority to EP07120132A priority Critical patent/EP2058517B1/de
Priority to DE602007009120T priority patent/DE602007009120D1/de
Priority to AT07120132T priority patent/ATE480712T1/de
Publication of EP2058517A1 publication Critical patent/EP2058517A1/de
Application granted granted Critical
Publication of EP2058517B1 publication Critical patent/EP2058517B1/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
    • 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
    • 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
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod

Definitions

  • the present invention relates to a pump.
  • the present invention relates to a membrane pump.
  • the present invention can be advantageously used in the agricultural and/or gardening sector.
  • Membrane pumps consisting of a plurality of chambers intended to pump a fluid are known.
  • the arrangement of the chambers may vary depending on the type of pump employed and may have a circumferential, radial or in-line layout.
  • Each pump has a number of pumping chambers which may vary from at least one to a plurality of chambers, each having a movable deformable membrane.
  • the said deformable membrane is movable between a first operative position where the same, reaching a top dead centre, favours delivery of a fluid, and a second operative position where the same, reaching a bottom dead centre, favours intake of a fluid.
  • the chamber therefore has a variable volume.
  • Each chamber has an inlet opening, which forms the intake mouth, and an outlet opening, which forms the delivery mouth. Both the intake mouth and the delivery mouth are provided with a respective one-way valve.
  • Each movable membrane is connected to suitable movement means.
  • these movement means consist of a driving shaft arranged along a central axis of the pump.
  • a cam is situated in the vicinity of a central portion of the shaft and has a connecting rod connected thereto.
  • the connecting rod is connected to a piston by means of a pin.
  • the movement means impart an alternating linear movement to the membrane.
  • This membrane may be connected directly to the piston or may be connected to a first disk situated between the membrane and the piston.
  • the pump also comprises a second disk connected to the membrane and lying entirely inside the chamber, thus defining a movable wall.
  • the second disk facilitates recall of the membrane when the same reaches the bottom dead centre.
  • the pumps of the known type also comprise a main containing body for enclosing the movement means. This containing body defines an inner chamber.
  • the movement means are housed inside the inner chamber in a lubricating bath in order to ensure the necessary lubrication of the said means.
  • the piston displaces the membrane from the top dead centre, further away from the inner chamber, to the bottom dead centre, closer to the inner chamber. In this way, the volume of the chamber increases and a vacuum is created inside the chamber itself. A fluid then enters from the intake mouth into the chamber through the one-way intake valve.
  • document US 2007/0140878 A1 discloses a pump comprising a head-piece, a containing body and a membrane pinched between them and connected with means for executing reciprocating motion.
  • the membrane defines, together with the head-piece, a main chamber for pumping a fluid and, together with the containing body, an inner chamber filled with lubricant.
  • a refilling duct is provided in the containing body, which comes from an oil sump and opens out into the inner chamber via a lift-off valve.
  • document US 3,680,981 describes a pump comprising a main chamber fed with liquid to be pumped, an inner chamber partially filled with lubricant and a membrane separating these chambers from each other.
  • the inner chamber is partially filled with lubricant to which driving pressure is intermittently applied and relieved by means of a cylindrical piston driven by a rotating wobble plate.
  • the inner chamber communicates with a container for the lubricant by means of a refill passage and an overflow passage containing a pressure limiting valve.
  • the membrane being subject to a continuous compression and expansion cycle, may break as a result of wear.
  • the membrane is the sole separating part between, the lubricant, contained in the inner chamber, and the pumped fluid, contained in the main chamber, the breakage thereof results in mixing of the lubricant and the pumped fluid, causing serious damage to the entire pump and subsequently producing the complete break-down thereof.
  • the lubricant contained in the inner chamber flows out, following tearing of the membrane, lubrication of the movement means is limited considerably, causing serious damage to the said means.
  • Mixing of the lubricant with the pumped fluid also causes contamination of the latter, resulting in a significant wastage of fluid.
  • the pumping fluids may contain plant protection products or other herbicidal/pesticidal agents, breakage of the membrane results in the concentrated dispersion in the environment of the pumped liquid, causing serious environmental pollution.
  • the technical object of the present invention is to propose a pump which does not possess the disadvantages of the pumps of the prior art.
  • the object of the present invention is to provide a pump in which, following breakage of the membrane, there is no mixing between the lubricating substance and the pumped fluid.
  • Another object of the present invention is to provide a pump in which, following breakage of the membrane, the wastage of fluid and at the same time the dispersion thereof is significantly reduced.
  • a further object of the present invention is to provide a pump which ensures a constant lubricating efficiency even following breakage of the membrane.
  • 1 denotes overall a pump according to the present invention.
  • the pump 1 comprises a containing body 2 and a closing flange 3 which define an inner chamber 4 containing a lubricant.
  • the pump 1 also comprises at least one main chamber 5.
  • the pump 1 comprises a variable number of main chambers 5.
  • the latter may be arranged in circular fashion, linearly or in other arrangements.
  • the main chambers 5 are arranged in circular fashion around a central axis "X" of the pump 1 and are spaced equidistantly from each other.
  • Each main chamber 5 comprises an intake mouth 6 provided with an associated one-way valve 7 and a delivery mouth 8 provided with an associated one-way valve 9. The fluid which must be pumped flows between the intake mouth 6 and the delivery mouth 8.
  • the main chamber 5 also comprises a flexible membrane 10 which isolates the inner chamber 4 and the main chamber 5 itself from each other. Moreover, the membrane 10 is deformable and movable between a top dead centre and a bottom dead centre. In other words, the membrane 10 is movable between a first operative position further away from the inner chamber 4 and a second operative position closer to the inner chamber 4.
  • Each main chamber 5 is delimited at the bottom by the membrane 10 and at the top by a head-piece 11 connected to the containing body 2.
  • each main chamber 5 has a semispherical shape and the membrane 10 is fixed between the main body 2 and the head-piece 11.
  • the membrane 10 has a circular shape.
  • the main chamber 5 has a variable volume.
  • a vacuum is created inside the main chamber 5 and draws the fluid inside the pump 1.
  • an overpressure is created inside the main chamber 5 and pushes the fluid outside the pump 1.
  • the pump 1 also comprises movement means 12 which are operationally connected to the membrane 10 and cause displacement of the membrane 10 movable between the first and second operative position.
  • the movement means 12 are connected to a movable wall 13 associated with the membrane 10.
  • the movable wall 13 comprises a first disk 14 arranged concentrically with the membrane 10 and situated on the opposite side to the main chamber 5.
  • the movable wall 13 also comprises a second disk 15 arranged concentrically with the membrane 10 and the first disk 14 and contained entirely inside the main chamber 5.
  • the membrane 10 is arranged between the first disk 14 and the second disk 15.
  • the movement means 12 comprises a shaft 16 which is associated with a motor (not shown) and which extends along the central axis "X" and a piston 17 associated with the membrane 10.
  • the driving shaft 16 is supported on the containing body 2 and on the closing flange 3 by means of first ball bearings 18.
  • a connecting rod 19 is provided, being connected, respectively, to the piston 17, by means of a pin 20, and to a cam 21, by means of second ball bearings 22.
  • the movable wall 13 is fixed to the piston 17 by means of a screw 23.
  • the pump 1 also comprises sealing means 24 which define at least one cavity 25 in association with the membrane 10.
  • the cavity 25 is defined by the membrane 10 as well as by the said sealing means 24. Therefore, the pump 1 comprises at least one cavity 25 associated with each main chamber 5.
  • the sealing means 24 have the function of isolating the cavity 25 from the inner chamber 4. In this way it is not possible for the pumped fluid to mix with the lubricant in the event of breakage of the membrane 10.
  • the sealing means 24 are defined by a seal 26 which is arranged between the containing body 2 and the piston 17 and inside which the piston 17 is seated, in order to isolate the cavity 25 and the inner chamber 4 from each other.
  • the pump 1 has at least one hole 27 which facilitates the fluid communication between the cavity 25 and the exterior of the pump 1.
  • the hole 27 is formed in the containing body 2 opposite the cavity 25.
  • the hole 27 allows the passage of air which is drawn in or pumped during the movement of the membrane 10.
  • the hole 27 allows the outflow of the pumped fluid which seeps out from the main chamber 5 into the cavity 25. In this way the outflowing fluid is prevented from being able to break the seal 26, thus allowing mixing of the pumped fluid with the lubricant.
  • the pump 1 may also have, in the vicinity of the cavity 25, at least one tank 28 for collecting the fluid, communicating therewith via the hole 27.
  • the pump 1 may comprise at least one tank 28 associated with each cavity 25.
  • the pump 1 may comprise a single tank 28 situated so as to be connected to each cavity 25.
  • the tank 28 is formed along a side edge of the containing body 2.
  • the tank 28 is formed by means of suitable shaping of the containing body 2.
  • the storage tank 28 therefore has an annular shape.
  • the tank 28 also comprises a cover 29 which is connected directly to the containing body 2.
  • the tank 28 is also associated with a sensor 30 for detecting the presence of fluid in the tank 28.
  • This sensor 30 detects the presence of fluid in the tank 28.
  • the sensor 30 is advantageously connected to an acoustic or visual signalling system (not shown). Therefore, in the event of the membrane 10 associated with one of the main chambers 5 tearing and the tank 28 being filled with fluid, the signalling system signals the breakage of the membrane 10 which has occurred.
  • the storage tank 28 comprises a pipe 31 which prevents the accumulation of fluid in the tank 28. This pipe 31 is formed in the vicinity of a bottom portion 29a of the cover 29.
  • the present invention achieves the objects proposed and results in significant advantages.
  • the presence of the sealing means 24 prevents mixing of the pumped fluid with the lubricant contained in the inner chamber 4.
  • the pumped fluid which flows out of the main chamber 5 passes into the cavity 25.
  • the seal 26 prevents this fluid from penetrating into the inner chamber 4 and being mixed with the lubricant. Consequently, a further advantage which is obtained is that relating to the fact that, owing to the presence of the tank 28, any wastage of the pumped fluid is avoided, preventing moreover the latter from being dispersed into the surrounding environment, causing environmental pollution.
  • the sealing means 24 and the hole 27 ensure that the lubricant remains confined inside the inner chamber 4 and cannot flow out even following breakage of the membrane 10. In this way, the constant and efficient lubrication of the movement means 12 is ensured.
  • the presence of the sensor 30 allows rapid detection of a breakage of the membrane 10. The operator may therefore take prompt action and limit generally the damage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Driven Valves (AREA)
  • Eye Examination Apparatus (AREA)

Claims (8)

  1. Pumpe, umfassend:
    - ein Gehäuse (2) und einen Verschlussflansch (3), die eine Innenkammer (4) bilden, welche ein Schmiermittel enthält;
    - mindestens eine Hauptkammer (5), die auf der Unterseite von einer Membran (10) und auf der Oberseite von einem Kopf (11) begrenzt wird, die an das besagte Gehäuse (2) angeschlossen ist und eine Ansaugöffnung (6) und eine Auslassöffnung (8) für eine Flüssigkeit besitzt; wobei die Hauptkammer (5) die biegsame Membran (10)umfasst, welche die Hauptkammer (5) und die Innenkammer (4) voneinander trennt und sich zwischen einer ersten Arbeitsposition von der Innenkammer (4) heraus- und einer zweiten Arbeitsposition an die Innenkammer (4) heran bewegbar ist;
    - Mittel zur Bewegungsübertragung (12), die zumindest teilweise in der Innenkammer (4) enthalten sind und auf die bewegliche Membran (10) einwirken, um die bewegliche Membran (10) zu bewegen; wobei die Mittel zur Bewegungsübertragung (12) umfassen mindestens einen Kolben (17), der über eine bewegliche Wand (13) an die Membran (10) angeschlossen ist, um Letztere zwischen der ersten und der zweiten Position zu führen;
    dadurch gekennzeichnet, dass sie:
    - Mittel zum Abdichten (24), bestehend aus einer Dichtung (26), die zwischen dem Gehäuse (2) und dem Kolben (17) angebracht ist und sich im Inneren des Kolbens (17) befindet; die Mittel zum Abdichten (24), die zusammen mit der Membran (10) einen Zwischenraum (25) zwischen der Innenkammer (4) und der Hauptkammer (5) bilden und in der Lage sind, den Zwischenraum (25) von der Innenkammer (4) abzudichten;
    - wenigstens eine Öffnung (27) auf dem Gehäuse (2) auf Höhe des Zwischenraums (25), um die Flüssigkeitskommunikation zwischen dem Zwischenraum (25) und dem Pumpenäußeren zu begünstigen, umfasst.
  2. Pumpe gemäß Patentanspruch 1, dadurch gekennzeichnet, dass die bewegliche Wand (13) eine erste Scheibe (14) und eine zweite Scheibe (15) umfasst, die an den entgegengesetzten Seiten der Membran (10) anliegen; wobei die bewegliche Wand (13) mit einer Schraube (23) am Kolben (17) befestigt ist.
  3. Pumpe gemäß dem Patentanspruch 1, dadurch gekennzeichnet, dass sie außerdem mindestens einen Sammelbehälter (28) für die Flüssigkeit umfasst, der in Nähe des Zwischenraums (25) liegt und mit ihm über eine Öffnung (27) kommuniziert.
  4. Pumpe gemäß Patentanspruch 3, dadurch gekennzeichnet, dass der Behälter (28) außerdem einen Deckel (29) umfasst; wobei der Deckel (29) außerdem eine Leitung (31) umfasst, um zu vermeiden, dass sich Flüssigkeit im Behälter (28) ansammelt.
  5. Pumpe gemäß Patentanspruch 3, dadurch gekennzeichnet, dass sie außerdem einen Sensor (30) umfasst, um die Flüssigkeitsanwesenheit im Behälter (28) zu ermitteln.
  6. Pumpe gemäß Patentanspruch 1, dadurch gekennzeichnet, dass die Mittel zur Bewegungsübertragung (12) außerdem eine Antriebswelle (16) umfassen, die längs einer Mittelachse (x) der Pumpe (1) verläuft und über einen an einem zentralen Abschnitt der Welle (16) angebrachten Exzenter (21) verfügt.
  7. Pumpe gemäß Patentanspruch 6, dadurch gekennzeichnet, dass die Mittel zur Bewegungsübertragung (12) ausserdem mindestens einen, mit einem Stift (20) am Kolben (17) befestigten Pleuel (19) umfassen, wobei der Pleuel (19) mit dem Exzenter (21) verbunden ist.
  8. Pumpe gemäß Patentanspruch 1, dadurch gekennzeichnet, dass sie eine Vielzahl an winklig äquidistanten, mit dem Behälter (28) verbundenen Hauptkammern (5) umfasst.
EP07120132A 2007-11-07 2007-11-07 Pumpe Not-in-force EP2058517B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07120132A EP2058517B1 (de) 2007-11-07 2007-11-07 Pumpe
DE602007009120T DE602007009120D1 (de) 2007-11-07 2007-11-07 Pumpe
AT07120132T ATE480712T1 (de) 2007-11-07 2007-11-07 Pumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07120132A EP2058517B1 (de) 2007-11-07 2007-11-07 Pumpe

Publications (2)

Publication Number Publication Date
EP2058517A1 EP2058517A1 (de) 2009-05-13
EP2058517B1 true EP2058517B1 (de) 2010-09-08

Family

ID=39068996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07120132A Not-in-force EP2058517B1 (de) 2007-11-07 2007-11-07 Pumpe

Country Status (3)

Country Link
EP (1) EP2058517B1 (de)
AT (1) ATE480712T1 (de)
DE (1) DE602007009120D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103688055A (zh) * 2011-07-01 2014-03-26 罗伯特·博世有限公司 用于传输介质的薄膜

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1399533B1 (it) 2010-04-22 2013-04-19 Bertolini Idromeccanica Pompa alternativa
IT1399534B1 (it) * 2010-04-22 2013-04-19 Bertolini Idromeccanica Pompa alternativa
DE102015205060A1 (de) * 2015-03-20 2016-09-22 Continental Teves Ag & Co. Ohg Motorpumpenaggregat mit einer Membraneinheit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680981A (en) 1970-12-21 1972-08-01 Josef Wagner Pump and method of driving same
US4682937A (en) * 1981-11-12 1987-07-28 The Coca-Cola Company Double-acting diaphragm pump and reversing mechanism therefor
US5165869A (en) * 1991-01-16 1992-11-24 Warren Rupp, Inc. Diaphragm pump
FR2895036B1 (fr) 2005-12-20 2008-02-22 Milton Roy Europ Sa Pompe a membrane a actionnement hydraulique avec dispositif de compensation des fuites

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103688055A (zh) * 2011-07-01 2014-03-26 罗伯特·博世有限公司 用于传输介质的薄膜

Also Published As

Publication number Publication date
DE602007009120D1 (de) 2010-10-21
ATE480712T1 (de) 2010-09-15
EP2058517A1 (de) 2009-05-13

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