EP0211734B1 - Dosierpumpe - Google Patents

Dosierpumpe Download PDF

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Publication number
EP0211734B1
EP0211734B1 EP86401595A EP86401595A EP0211734B1 EP 0211734 B1 EP0211734 B1 EP 0211734B1 EP 86401595 A EP86401595 A EP 86401595A EP 86401595 A EP86401595 A EP 86401595A EP 0211734 B1 EP0211734 B1 EP 0211734B1
Authority
EP
European Patent Office
Prior art keywords
pump
valve
support
pumping volume
accordance
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
Application number
EP86401595A
Other languages
English (en)
French (fr)
Other versions
EP0211734A1 (de
Inventor
Michel Texier
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.)
ALPHA-PLASTIQUES
Original Assignee
ALPHA-PLASTIQUES
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Publication date
Application filed by ALPHA-PLASTIQUES filed Critical ALPHA-PLASTIQUES
Publication of EP0211734A1 publication Critical patent/EP0211734A1/de
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Expired 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
    • F04B43/04—Pumps having electric drive
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves

Definitions

  • the present invention relates to a metering pump, applicable in particular in the chemical industry for the supply of very low flow rates of liquid products, taken from a reserve and discharged to a device for use.
  • Knowing the volume of the enclosure it is thus possible, by adjusting the speed or the rate of movement of the diaphragm, to provide at the outlet of the pump beyond the discharge valve an exactly determined flow rate which can also be adjusted in a wide range of values at the user's discretion.
  • the subject of the present invention is a metering pump which makes it possible to avoid these drawbacks, by ensuring, even for a very low flow rate, for example less than one liter per hour, instant and guaranteed self-priming of the device, it can also be very small, which allows a cost price significantly reduced vis-à-vis comparable conventional solutions.
  • the metering pump considered comprising a pump body, part of which is constituted by a control membrane fixed in leaktight manner to the pump body and driven back and forth under the effect of a control, so as to periodically reduce and increase a pumping volume defined between the pump body and the diaphragm and two valves, respectively suction and discharge, joined for one to an inlet pipe and for the other to an outlet pipe for a liquid to be pumped, these valves being mounted in a support, integral with the pump body and separating the pumping volume communicating with the inlet pipe via the suction valve and a collecting capacity communicating with the pumping volume via the discharge valve and connected to the liquid outlet conduit, is characterized in that each valve consists in a manner known per se, of a flat and thin plate mounted with the interposition of a seal d sealing in a housing provided in the support, the housing of the two valves being open respectively to the pumping volume for the suction valve and to the collecting capacity for the discharge valve, the plates of the two valves each pressing against a first
  • the pumping volume on the one hand, the collecting capacity on the other hand, on each side of the valve support contain an assembly formed by a thin elastic washer against which a layer of porous foam is applied, of so that the liquid sucked in on one side, discharged on the other, crosses with each flapping of the membrane the corresponding assembly, coming from one side of the suction valve and leaving the other from the discharge valve .
  • the membrane comes at the end of its travel corresponding to the minimum dimensions of the pumping volume in direct contact with the layer of foam, which thus reduces the residual volume available.
  • the capillary effect created by the porous foam and the distribution of the liquid pressure created by the associated washer allows in all circumstances the self-priming of the pump, even for very limited liquid flow rates or significant pumping heights.
  • the inlet duct communicates with the housing of the suction valve and the pumping volume communicates with the housing of the discharge valve by bores machined in the support.
  • the layer of material elastic consists of polyurethane foam or the like, with open cells.
  • the thin washers disposed respectively in the pumping volume and in the collecting capacity against the suction and discharge valves are made of rubber and immobilized respectively by their periphery between on the one hand in the pumping volume, the support and a shoulder provided in the pump body and on the other hand in the collecting capacity between the support and a closing cover defining this capacity.
  • control membrane has a general shape of revolution around an axis perpendicular to the planes of the valves and is formed by an injected plastic material, this membrane comprising an external collar provided with a housing for a seal applied against a bearing surface of the pump body, the membrane being immobilized thereon by means of a counter-flange.
  • the counter-flange constitutes the support of an electromagnet, comprising a magnetic sheet carcass provided with an electrical winding and capable of attracting against one of its faces extending perpendicular to the axis of the membrane a flat magnetic piece, integral with a sliding rod axially passing through the winding and a passage, formed in the counter-flange facing the membrane, this rod being connected to the center of the latter along its axis by an end piece link.
  • the sliding rod comprises a support plate for a return spring of the flat magnetic part, opposing the attraction of the latter by the electromagnet, this spring being held against a bearing provided at the opposite on the counter flange.
  • the cover for closing the collecting capacity is extended by a threaded plug, provided with an axial passage through which the liquid supply duct passes, this plug being able to be secured by screwing with the end of a container or reserve of liquid to be pumped.
  • the pump considered consists mainly of a plastic pump body 1 on which is mounted a protective bell 2 of plastic or other material.
  • This bell 2 intended as will be seen below, to contain an electromagnet for controlling the pump, has a lateral extension 3, clamped at its end by means of a sealing collar 4 on electrical connection wires 5 of the electromagnet.
  • the pump body 1 is associated with a cover 6, provided at its lower end with a plug 7 axially traversed by a conduit 8 for sucking the liquid to be pumped, connecting directly to the interior of the pump body 1.
  • a conduit for discharging the same liquid discharged by the pump is designated by the reference 9, the latter being directly connected to the cover 6 applied against the body 1.
  • the end plug 7 is in particular intended to allow direct connection of the pump on the end of a can 10 or similar reserve, of the liquid to be pumped (fig. 2).
  • FIGs 3, 4 and 5 illustrate in more detail the embodiment of the pump considered and in particular of the valves thereof and the means associated therewith.
  • the body of the pump 1 comprises a transverse flange 11 against which a flange 12 applied internally against the corresponding end of the protective bell 2 is applied, this flange 12 being clamped between the flange 11 and a counter-flange 13 applied against the latter and assembled with the latter in the manner which will be described in more detail below, with reference to FIG. 6.
  • This counter-flange 13 includes a first cylindrical flange 14 against the upper end 15 from which the upper end face 16 of an electromagnet 17 is applied, the detail of which is of little importance to the invention and is in itself classic.
  • This electromagnet 17 comprises in particular an electric coil 18 joined directly inside the bell 2 to the connections 5, and has axially a bore 19 internally provided with bearings 20 and 21, allowing movement without play inside this bore 19 of a sliding rod 22.
  • This comprises at its end directed towards the bottom of the bell 2, a threaded extension 23 freely passing through a hole in the center of a magnetic piece 24 forming a magnet, able to be attracted by the electromagnet 17 when the latter is energized.
  • the part 24 is immobilized against a shoulder 25 formed at the end of the rod 22 and is locked against the latter by a washer 26 and a nut 27 engaged on the threaded extension 23.
  • the rod 22 rests on a transverse plate 28, itself serving as a stop at the end of a helical spring 29 mounted coaxially with the sliding rod 22, this spring 29 being housed inside a second cylindrical flange 30 formed in the counter-flange 13 inside the first flange 14.
  • the spring 29, immobilized between the central portion 31 of the counter-flange 13 and the plate 28, makes it possible to exert on the latter and consequently on the rod 22, an antagonistic force opposing the attraction of the electromagnet 17 with respect to the magnetic part 24, and in particular in the absence of electrical power on the coil 18, by pushing this piece into the position illustrated in the drawing.
  • a semi-rigid control membrane 32 made of a suitable preformed plastic material.
  • This membrane 32 comprises an end flange 33, trapped between the flange 11 and the counter-flange 13 and has an external groove 34 for housing an O-ring seal 35.
  • the membrane 32 comprises an end piece 37 disposed in the extension of the rod 22, this end piece 37 having a hollow profile internally threaded and into which is screwed a threaded part 38 provided at the corresponding end of the rod 22.
  • An O-ring 39 is mounted between the semi-rigid membrane 32 and the corresponding face of the counter-flange 14 in order to avoid, in the position of maximum displacement of the rod 22 under the effect of the electromagnet, a damaging crushing of the membrane.
  • the suction duct 8 penetrates inside the pump body 1 through a seal 40 and opens into a housing 41 in which is mounted a support 42 for the valves of the pump, as shown in more detail fig. 4.
  • the discharge conduit 9 for its part enters the cover 6 through a seal 43 subjected to the action of a washer 44, itself held in place by a cover 45 blocked by means of a screw 46 on a bearing face 47 provided on the outside of the body 1, the seal between the cover 6 and the body 1 being produced during assembly by means of a seal 48.
  • the support 42 of the valves of the pump 1 delimits inside the assembly constituted by the pump body 1 and the cover 6, two separate regions constituting respectively the pumping volume 49 between the support and the control membrane 32 and a collecting capacity 50 where the pumped liquid is collected, between the support 42 and the cover 6.
  • the support 42 (fig. 4) has two pipes 51 and 52 respectively, the first of which putting in communication the housing 41 where the suction duct 8 opens with the pumping volume 49, while the second puts this same volume 49 in communication with the collecting capacity 50.
  • the support 42 also comprises, towards the end of the pipes 51 and 52 opening for one into the pumping volume 49 and the collecting capacity 50 for the other, two suction valves 53 and discharge 59 respectively, of which the detail is also illustrated in the perspective view of FIG. 5.
  • the suction valve 53 consists of a plate 54 made of a rigid material, of stainless steel or other, against which an O-ring seal 55 is applied.
  • the plate 54 is in abutment in its face directed towards the pumping volume 49 against a washer 56 of rubber or other similar thin material, having across its surface a set of communication holes 57.
  • On the opposite face of the washer 56 is also disposed a layer 58 of a material having an open and porous structure, advantageously made up of another washer made of polyurethane foam or the like.
  • the discharge valve 59 mounted at the opposite end of the pipe 52 to the collecting capacity 50 likewise comprises a plate 60, a seal 61, a rubber washer 62 whose surface is pierced with a set of communication holes 63 and a complementary piece or washer of polyurethane foam 64, mounted against the cover 6.
  • the dosing pump also comprises, as illustrated in FIG. 6, means allowing easy and rapid assembly of its main parts by means of a single fixing member.
  • the counter-flange 13 is associated with an anchoring part 65 having a flange 66 engaged in a housing 67 of the end face 16 of the electromagnet 17.
  • This part 65 comprises a threaded part 68 receiving the end of a stud 69 which thus rigidly assembles the cover 6, the pump body 1, the counter flange 13 and the bell 2.
  • the cover 6 is extended in the direction of the suction duct 8 by a flange 70 through which this duct passes and provided in its upper end with a flange 71, allowing both attachment and free rotation of the threaded plug 7, the latter comprising an internal thread 72 cooperating with the end 73 of the container or liquid reserve 10, in which the end of the duct 8 plunges.
  • An orifice 74 allows communication with the external atmosphere of the reserve .
  • the dosing pump shown mounted as illustrated in the drawings, is connected to a reserve or container 10 of any liquid product to be pumped.
  • the suction duct 8 penetrates below the level of the liquid, so that the energizing of the electromagnet 17 by means of a control device (not shown) successively supplying and cutting off the current , allows, at a determined rate, a movement of movement back and forth from the membrane 32.
  • the liquid sucked through the conduit 8 thus enters the housing 41 then, through the pipe 51, is routed to the valve suction 53.
  • this valve opens, allowing the introduction of a suitable quantity into the pumping volume, after the washer 56 has passed through its holes 57 and of the foam layer 58, when the movement of the rod 22 is reversed, the quantity of liquid thus sucked up is discharged through the pipe 52, the valve 53 being previously closed.
  • the second valve 59 opens, the liquid then being discharged through the washer 62 and the holes 63 thereof towards the layer of foam 64 and the collecting capacity 50, before leaving via the evacuation pipe 9.
  • the diameter of the seals 55 and 61 can be between 1.15 mm and 3.15 mm that of the valves 54 and 60 close to 4 mm, the rubber washers located behind these having a maximum diameter of 14 mm with a thickness of the order of a millimeter.
  • the layers of foam placed behind the rubber washers have a thickness of not more than 2 mm.
  • One of the main advantages of the metering pump thus produced consists in its self-priming whatever the requested flow rate, the rate of movement of the membrane, and the nature of the liquid to be pumped. Furthermore, the very simple construction of the pump and its relatively limited number of parts make it possible to significantly lower its cost price and in such a way that it can, as a general rule, constitute a simple accessory sold with cans or liquid reserves. considered, by providing the purchaser with a particularly appreciated advantage.

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

Claims (9)

1. Dosierpumpe mit einem Pumpenkörper (1), von welchem ein Teil von einer Steuermembran (32) gebildet ist, welche dicht an dem Pumpenkörper befestigt und unter Wirkung eines Steuerorgans (17) zu einer Hin- und Herbewegung angeregt ist, derart, daß ein von dem Pumpenkörper und der Membran begrenzter Pumpraum periodisch verkleinert und vergrößert wird, und mit zwei zum Ansaugen bzw. zur Verdrängung vorgesehenen Klappen (53-59), welche einerseits mit einem Eintrittsrohr (8) und andererseits mit einem Austrittsrohr (9) für eine zu pumpende Flüssigkeit verbunden sind, wobei diese Klappen in einem formschlüssig mit dem Pumpenkörper verbundenen Tragerteil (42) angebracht sind, welches den über die Ansaugklappe (53) mit dem Eintrittsrohr verbundenen Pumpraum von einem über die Verdrängungsklappe (59) mit dem Pumpraum in Verbindung stehenden Sammelraum (50) trennt und mit dem Austrittsrohr für die Flüssigkeit verbunden ist, dadurch gekennzeichnet, daß jede Klappe in an sich bekannter Weise durch ein ebenes und dünnes Plättchen (54-60) gebildet ist, weiches unter Zwischenschaltung einer Dichtverbindung (55-61) in einem in dem Trageteil vorgesehenen Sitz angeordnet ist, wobei die Sitze der beiden Klappen hinsichtlich der Ansaugklappe zu dem Pumpraum und hinsichtlich der Verdrängungsklappe zu dem Sammelraum offen sind, und die Plättchen der beiden Klappen jeweils gegen eine erste Fläche einer dünnen Scheibe (56-62) aus elastischem Material abgestützt sind, welche fest gegen das Trageteil anliegen und mit Verbindungslöchern (57-63) zur Verbindung mit dem Pumpraum bzw. dem Sammelraum versehen sind, wobei jede Scheibe mit ihrer dem Plättchen der Klappe gegenüberliegenden Fläche gegen eine Schicht (58-64) von geringer Dicke aus einem offenporigen elastischen Material anliegt.
2. Dosierpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Eintrittsrohr (8) mit dem Sitz der Ansaugklappe in Verbindung steht, und daß der Pumpraum (49) mit dem Sitz der Verdrängungsklappe über in das Trageteil (42) eingearbeitete Bohrungen (51-52) in Verbindung steht.
3. Dosierpumpe nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Schicht (58-64) aus elastischem Material aus Polyurethanschaum mit offenen Zellen gebildet ist.
4. Dosierpumpe nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die in dem Pumpraum (49 bzw. in dem Sammelraum (50) gegen die Ansaug- und Verdrängungsklappen anliegenden dünnen Scheiben (56-62) aus Kautschuk bestehen.
5. Dosierpumpe nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die dünnen Scheiben an ihrer Peripherie fest angebracht sind, und zwar einerseits in dem Pumpraum (49) zwischen dem Trageteil (42) und einer in dem Pumpenkörper vorgesehenen Schulter und andererseits in dem Sammelraum (50) zwischen dem Trageteil und einem diesen Raum begrenzenden Verschlußdeckel (6).
6. Dosierpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Steuermembran (32) als in bezug auf eine senkrecht zu den Klappenebenen liegende Achse gestalteter Rotationskörper und als Spritzgieß-Kunststoffteil ausgebildet ist, wobei diese Membran einen Außenrand (32) aufweist, der mit einem Sitz für ein gegen eine Auflagefläche des Pumpenkörpers angedrücktes Dichtverbindungsstück (34) versehen ist, wobei die Membran mittels eines Gegenflansches (13) relativ zu diesem fest angebracht ist.
7. Dosierpumpe nach Anspruch 6, dadurch gekennzeichnet, daß der Gegenflansch das Trageteil für einen Elektromagneten (17) bildet und ein mit einer elektrischen Wicklung (18) versehenes Gestell aus Magnetblechen aufweist und zum Anziehen eines ebenen Magnetstückes (24) gegen eine sich senkrecht zu der Membranachse erstreckende Fläche ausgebildet ist, wobei das Magnetstück fest mit einer Kulissenstange (22) verbunden ist, welche axial die Wicklung und eine in dem Gegenflansch (13) gegenüberliegend zu der Membran (32) vorgesehene Durchführung durchquerend angeordnet ist, wobei diese Stange in ihrer Achsrichtung über eine Verbindungstülle (38) mittig mit der Membran verbunden ist.
8. Dosierpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Kulissenstange (22) ein Stützplättchen (28) für eine Feder (29) zum Rückholen des ebenen Magnetstückes (24) aufweist, welche der Anziehungskraft des Elektromagneten auf dieses entgegenwirkt, wobei die Gegenhalterung dieser Feder an einer gegenüberliegend auf dem Gegenflansch (13) vorgesehen Auflagerung (31) erfolgt.
9. Dosierpumpe nach Anspruch 5, dadurch gekennzeichnet, daß der Verschlußdeckel (6) des Sammelraums durch eine mit Gewinde versehene Kappe (7) verlängert ist, welche eine axiale, von dem Eintrittsrohr (8) für die Flüssigkeit durchquerte Durchgangsöffnung aufweist, wobei diese Kappe durch eine Schraubenverbindung mit einem Behälter (10) oder einem Vorrat der zu pumpenden Flüssigkeit fest verbindbar ist.
EP86401595A 1985-08-06 1986-07-17 Dosierpumpe Expired EP0211734B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8512008A FR2586064B1 (fr) 1985-08-06 1985-08-06 Pompe doseuse
FR8512008 1985-08-06

Publications (2)

Publication Number Publication Date
EP0211734A1 EP0211734A1 (de) 1987-02-25
EP0211734B1 true EP0211734B1 (de) 1989-05-24

Family

ID=9322020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401595A Expired EP0211734B1 (de) 1985-08-06 1986-07-17 Dosierpumpe

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EP (1) EP0211734B1 (de)
DE (1) DE3663568D1 (de)
FR (1) FR2586064B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661955B1 (fr) * 1990-05-11 1992-07-24 Alpha Plastiques Pompe doseuse.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1224446A (fr) * 1958-05-10 1960-06-23 Soupapes avec siège en caoutchouc ou matière analogue, destinées aux pompes et en particulier à celles pour l'alimentation en combustible
DE2803471C2 (de) * 1978-01-27 1980-01-03 Dulger, Viktor, 6900 Heidelberg Dosierpumpenkopf
DE2855541C2 (de) * 1978-12-22 1982-05-19 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Druckventil für eine Kolbenpumpe

Also Published As

Publication number Publication date
FR2586064A1 (fr) 1987-02-13
EP0211734A1 (de) 1987-02-25
FR2586064B1 (fr) 1987-10-23
DE3663568D1 (en) 1989-06-29

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