EP0538123B1 - Membranpumpe mit einem zwischen Null- und Maximalwert kontinuierlich verstellbaren Durchfluss - Google Patents

Membranpumpe mit einem zwischen Null- und Maximalwert kontinuierlich verstellbaren Durchfluss Download PDF

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Publication number
EP0538123B1
EP0538123B1 EP92402807A EP92402807A EP0538123B1 EP 0538123 B1 EP0538123 B1 EP 0538123B1 EP 92402807 A EP92402807 A EP 92402807A EP 92402807 A EP92402807 A EP 92402807A EP 0538123 B1 EP0538123 B1 EP 0538123B1
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EP
European Patent Office
Prior art keywords
connecting rod
bearing
bearing surface
pump according
guide
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
EP92402807A
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English (en)
French (fr)
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EP0538123A1 (de
Inventor
Jean-Paul Papin
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.)
PCM Pompes
Original Assignee
PCM Pompes
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Publication date
Application filed by PCM Pompes filed Critical PCM Pompes
Publication of EP0538123A1 publication Critical patent/EP0538123A1/de
Application granted granted Critical
Publication of EP0538123B1 publication Critical patent/EP0538123B1/de
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
    • F04B43/02—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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/121—Lost-motion device in the driving mechanism

Definitions

  • the present invention relates generally to the field of adjustable flow pumps and more particularly it relates to improvements made to interrupted cycle diaphragm pumps, with continuously adjustable flow between a zero value and a maximum value, according to the preamble of the claim 1.
  • Pumps are known in which the pumping member is driven in a reciprocating linear movement by a connecting rod-crank system with variable eccentricity driven by a rotating shaft (output of electric motor or internal combustion via a reducer gears, for example worm gear).
  • a connecting rod-crank system with variable eccentricity driven by a rotating shaft output of electric motor or internal combustion via a reducer gears, for example worm gear.
  • the means to be used for adjusting the offset are often complex and require precise machining and complicated shapes. These means include fragile parts which limit the life of the mechanism.
  • the size due to the presence of the stroke adjustment means is in all cases very large in relation to the size of the machine.
  • the dead volume in the pumping head (that is to say the position, at the end of the compression stroke) of the pumping member linked to the connecting rod varies depending on the stroke amplitude used, and it corresponds substantially to the middle of the displacement (or stroke) when the flow rate is set to 0%.
  • the dead volume increases in the low settings, a notable drop in efficiency is often observed for low flow rates.
  • the main object of the invention is to remedy the drawbacks of currently known devices and to propose an improved pump arrangement which not only makes it possible to continuously adjust the flow rate between a zero value and a maximum value, including for the very weak. values, but which also implements less complex and more reliable means than current pumps and above all which requires less motor power and which ultimately turns out to be more economical than current pumps.
  • an interrupted cycle diaphragm pump with continuously adjustable flow rate between a zero value and a maximum value, of the type defined in the preamble, is essentially characterized, being arranged in accordance with the invention, in that the connecting rod head is provided with at least one slide (11) extending substantially in the extension of the connecting rod (5) opposite the membrane (2) and capable of supporting the above-mentioned bearing (10) with free sliding relative to the connecting rod head, and in that elastic return means (15) are provided for maintaining said bearing (10) at the bottom of the slide in the absence of antagonistic force exerted by the eccentric member on the bearing, said means elastic return acting on said bearing opposite the connecting rod.
  • the pump arranged in accordance with the invention implements a real bi-crank system, which is a simpler mechanical structure than the previous systems.
  • the bearing surface can be supported by the slide at the free end thereof and in the extension of the connecting rod.
  • the arrangement it is then desirable for the arrangement to be such that the bearing surface constitutes a displacement stop for the sliding bearing.
  • the elastic return means can bear on the bearing surface.
  • the means for controlling the movable stop comprising a threaded rod rotating in a fixed threaded bore, the end of the threaded rod constituting or supporting the stop.
  • a pump in particular a metering pump, is formed, the flow rate of which is adjustable, entirely continuously, between a zero flow rate and a maximum flow rate, the continuity of the existing adjustment even for very low flow rates.
  • the diaphragm always occupies the same position at the end of the compression stroke whatever the set flow rate and the problems of a variation in dead volume and a drop in efficiency at low flow rates, presented by previous pumps, no longer arise. .
  • the mechanical structure of the entire pump remains simple, including with regard to the flow control means, and not very subject to wear, which has a beneficial influence on the manufacturing and maintenance costs.
  • the pump motorization can be less powerful, and therefore less costly.
  • a hollowed-out part of the wall thereof receives a deformable membrane 2 secured in leaktight manner by its peripheral edge 3 to a casing 4.
  • the center of the membrane 2 is secured (optionally with freely rotating articulation) to one end of a connecting rod 5, the other end of which is coupled, by means indicated below, to an eccentric wheel 6 in continuous rotation.
  • the eccentric wheel 6 is integral with a rotating shaft 7 which is driven by motor means, for example by means of a worm reducer (suggested in the drawing by its axis 8 and its casing 9) and gear straight (not visible, wedged on the shaft 7).
  • an external bearing 10 with bearings, the outer shell of which fits between two arms or slide rods 11 supported by and integral with the connecting rod 5, said slide rods extending parallel to the axis of the connecting rod 5.
  • the connection of the slide rods 11 to the connecting rod is in the form of a semicircular part 12 attached to the end of the connecting rod or forming an integral part of it, the bearing 10 being able to be housed in the rounding of the part 12 (position shown in the figure).
  • the bearing 10 is equipped with two diametrically opposite flanges and respectively surrounding the slide rods 11 with free sliding; these two flanges can be joined in the form of a single support plate 13 engaged in free sliding on the rods 11.
  • the free ends of the slide rods 11 are braced by a connecting piece 14 of which another function will appear later, the piece 14 being located at a distance from the bearing 10 and / or from the support plate 13 when the bearing 10 is in contact of the rounded part 12.
  • the part 14 can thus also constitute an end-of-travel stop when the bearing 10 moves.
  • a threaded rod 16 rotating in a threaded bore 17 passing through the wall of the casing 4.
  • the internal end 18 of the threaded rod 16 constitutes a movable stop (the rotation of the rod 16 resulting in its axial displacement) capable of cooperating with the connecting piece 14 secured to the connecting rod 5 and which, as such, serves as a bearing surface for said connecting rod.
  • An external handle 19 makes it possible to turn the threaded rod 16.
  • To block the threaded rod 16 in any desired axial position it is possible to provide locking means with an eccentric ring 20, which surrounds the threaded rod and which can be actuated in rotation by a button. grip 21.
  • the operation is as follows.
  • the connecting piece 14 strikes this stopper after having traversed a fraction of the stroke of the connecting rod which is a function of the axial position of the stopper .
  • the connecting rod 5 is then blocked in its axial movement, while, under the thrust of the eccentric wheel 6 driven by the shaft 7, the bearing 10 completes its movement by sliding on the slides 11, with compression of the springs 15, in the direction of the connecting piece 14.
  • the diaphragm 2 is therefore driven only during a fraction of the stroke of the connecting rod and the flow rate of the pump is established at a value corresponding to said fraction of stroke, in other words at the axial position. of the stop.
  • the diaphragm 2 In all cases, whatever the effective stroke of the connecting rod 5, the diaphragm 2 always occupies the same axial position when the connecting rod is in left dead center (in the figure). The dead volume of the pump therefore remains constant whatever the flow rate of the pump, including for low flow rates or zero flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (8)

  1. Membranpumpe mit kontinuierlich zwischen einem Nullwert und einem Maximalwert regelbarer Abgabe, umfassend:
    - ein kontiuierlichen drehbares, Exzenter-Antriebselement (6) ,
    - eine Triebstange (5), welche an einem ihrer Enden einen mit einem Lager (10) versehenen Triebstangenkopf (11-14) umfaßt, wobei das Lager (10) das Exzenter-Antriebselement (6) frei verdrehbar aufnimmt, und deren anderes Ende mit einem Zentralbereich der Membran (2) gekoppelt ist,
    - lösbare Kopplungsmittel, um den Triebstangenkopf im Verlauf eines kontinuierlich regelbaren, gewünschten Bruchteils des Hubs wahlweise mit dem Exzenter-Antriebselement (6) zu koppeln, und
    - Regelmittel (16-19) zur kontinuierlichen Regelung des gewünschten Bruchteils des Hubs der Triebstange (5) zwischen zwei Endstellungen, wobei die Regelmittel (16-19) bewegliche Anschlagmittel (18) umfassen, welche mit einem mit der Triebstange (5) verbundenen Anlageträger (14) zusammenwirken können;
    dadurch gekennzeichnet, daß der Triebstangenkopf mit wenigstens einer Gleitführung (11) versehen ist, welche sich im wesentlichen in der von der Membran (2) abgewandten Verlängerung der Triebstange (5) erstreckt und das vorgenannte Lager (10) relativ zum Triebstangenkopf frei verschiebbar halten kann, und daß elastische Rückstellmittel (15) vorgesehen sind, um das Lager (10) in Abwesenheit einer von dem Exzenterelement auf das Lager ausgeübten Gegenkraft auf dem Boden der Gleitführung zu halten, wobei die elastischen Rückstellmittel auf das Lager auf der der Triebstange entgegengesetzten Seite einwirken.
  2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Regelmittel umfassen:
    - einen mit der Triebstange (5) verbundenen Anlageträger (14),
    - einen verlagerbaren Anschlag (18), der mit dem Anlageträger (14) bei Bewegung der Triebstange zusammenwirken kann, wenn die Triebstange den gewünschten Bruchteil ihres Hubs durchlaufen hat, und
    - Steuermittel (16, 17, 19), um den Anschlag (18) zu verlagern und ihn in eine Stellung überzuführen, die es ihm erlaubt, den Hub der Triebstange auf den gewünschten Bruchteil zu begrenzen.
  3. Pumpe nach Anspruch 2, dadurch gekennzeichnet, daß der Anlageträger (14) von der Gleitführung am freien Ende derselben und in der Verlängerung der Triebstange gehalten ist.
  4. Pumpe nach Anspruch 3, dadurch gekennzeichnet, daß der Anlageträger ferner einen verlagerbaren Anschlag für das Gleitlager bildet.
  5. Pumpe nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die elastischen Rückstellmittel an dem Anlageträger anliegen.
  6. Pumpe nach Anspruch 5, dadurch gekennzeichnet,
    - daß die Gleitführung zwei Gleitschafte (11) umfaßt, welche von dem Triebstangenkopf gehalten und voneinander beabstandet sind, während sie sich in der Verlängerung der Triebstange erstrecken,
    - daß der Anlageträger (14) ein starres Teil ist, welches sich quer zur Triebstange (5) erstreckt und an den jeweils freien Ende der beiden Gleitschafte (11) befestigt ist,
    - daß das Gleitlager (10) auf den beiden Gleitschaften (11) frei verschiebbar angeflanscht (13) ist, und
    - daß die elastischen Rückstellmittel zwei Schraubenfeder (15) umfassen, welche die beiden Gleitschafte (11) jeweils umgeben und zwischen dem Lager (10) und dem Anlageträger (14) andeordnet sind.
  7. Pumpe nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß die Steuermittel für den beweglichen Anschlag einen Gewindeschaft (16) umfassen, der in eine feste Gewindeausnehmung (17) eingedreht ist, wobei das Ende des Gewindeschafts den Anschlag (18) bildet oder trägt.
  8. Pumpe nach Anspruch 7, dadurch gekennzeichnet, daß sie darüber hinaus Blockiermittel (20) umfaßt, welche den Gewindeschaft (16) in jeder gewünschten Axialstellung blockieren können.
EP92402807A 1991-10-17 1992-10-14 Membranpumpe mit einem zwischen Null- und Maximalwert kontinuierlich verstellbaren Durchfluss Expired - Lifetime EP0538123B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112820A FR2682720A1 (fr) 1991-10-17 1991-10-17 Procede de pompage a debit reglable continuement entre une valeur nulle et une valeur maximale et pompe a debit reglable mettant en óoeuvre ce procede.
FR9112820 1991-10-17

Publications (2)

Publication Number Publication Date
EP0538123A1 EP0538123A1 (de) 1993-04-21
EP0538123B1 true EP0538123B1 (de) 1994-11-30

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EP92402807A Expired - Lifetime EP0538123B1 (de) 1991-10-17 1992-10-14 Membranpumpe mit einem zwischen Null- und Maximalwert kontinuierlich verstellbaren Durchfluss

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Country Link
EP (1) EP0538123B1 (de)
DE (1) DE69200755T2 (de)
ES (1) ES2065764T3 (de)
FR (1) FR2682720A1 (de)
HK (1) HK1007343A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2442737B (en) * 2006-10-12 2010-12-15 Itt Mfg Enterprises Inc Self-priming centrifugal pump
WO2013156087A1 (en) * 2012-04-20 2013-10-24 Ecolab Inc. Diaphragm pump, in particular for use as a detergent dosage pump
CN113931828B (zh) * 2021-10-21 2023-06-23 气味王国(山东)科技有限公司 一种气腔压缩体积可调的气味涡圈高频喷射器动力装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895424A (en) * 1955-09-13 1959-07-21 Stewart Warner Corp Constant pressure liquid pump
US3661167A (en) * 1970-05-25 1972-05-09 A & D Fabricating Co Chemical feed pump with improved valve means
US3801232A (en) * 1972-08-15 1974-04-02 Precision Control Prod Corp Diaphragm pump
FR2660374B1 (fr) * 1990-03-29 1992-07-03 Milton Roy Dosapro Equipage mobile telescopique d'entrainement d'une pompe alternative.

Also Published As

Publication number Publication date
FR2682720A1 (fr) 1993-04-23
FR2682720B1 (de) 1995-05-24
DE69200755T2 (de) 1995-05-04
EP0538123A1 (de) 1993-04-21
HK1007343A1 (en) 1999-04-09
DE69200755D1 (de) 1995-01-12
ES2065764T3 (es) 1995-02-16

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