EP0758053A1 - Pompe doseuse encapsulée - Google Patents

Pompe doseuse encapsulée Download PDF

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Publication number
EP0758053A1
EP0758053A1 EP96112488A EP96112488A EP0758053A1 EP 0758053 A1 EP0758053 A1 EP 0758053A1 EP 96112488 A EP96112488 A EP 96112488A EP 96112488 A EP96112488 A EP 96112488A EP 0758053 A1 EP0758053 A1 EP 0758053A1
Authority
EP
European Patent Office
Prior art keywords
capsule
capsule membrane
dosing pump
pump according
membrane
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.)
Granted
Application number
EP96112488A
Other languages
German (de)
English (en)
Other versions
EP0758053B1 (fr
Inventor
Gerhard Habla
Original Assignee
MH-Technik GmbH
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 MH-Technik GmbH filed Critical MH-Technik GmbH
Publication of EP0758053A1 publication Critical patent/EP0758053A1/fr
Application granted granted Critical
Publication of EP0758053B1 publication Critical patent/EP0758053B1/fr
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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0063—Special features particularities of the flexible members bell-shaped flexible members
    • 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

Definitions

  • the pump chamber is designed as a capsule, which is delimited on the one hand by a rigid wall and on the other hand by a movable wall in the form of a capsule membrane, which can be moved between a limit position with a minimum capsule volume and a limit position with a maximum capsule volume by means of an actuating plunger.
  • An inlet and an outlet are formed in the fixed capsule wall.
  • An inlet check valve is associated with the inlet and an outlet check valve is associated with the outlet.
  • the invention has for its object to design a capsule pump of the basic construction just explained as a metering pump.
  • a capsule pump is to be created which delivers a defined volume of liquid per stroke of the capsule membrane, i.e. has a maximum and minimum volume as precisely defined as possible in the corresponding extreme positions of the capsule membrane.
  • the invention starts with the knowledge that the problem with a conventional capsule pump does not represent the inadequate reproducibility of the maximum capsule volume, but rather the inadequate reproducibility of the minimum capsule volume. Because, assuming sufficiently precise movement strokes or extreme positions of the plunger actuating the capsule membrane, which is not a problem, a dimensionally reproducible maximum capsule volume is easily achieved due to the dimensioning and the bending behavior of the capsule membrane in its extreme position corresponding to the maximum capsule volume, while with the bulging capsule membrane , that is, in the extreme position corresponding to the minimum capsule volume, a capsule membrane shape which can be reproduced with sufficient accuracy can practically not be achieved, but this does not play a role in conventional capsule pumps which serve solely for the purpose of conveying.
  • the solution to the problem according to the invention is that the minimum volume of the pump capsule is approximately reduced to zero by forming the fixed capsule wall with a shape complementary to the bulging of the capsule membrane in the foremost position and by ensuring that the capsule membrane is in the foremost position lies essentially over the entire surface of the complementarily shaped, fixed capsule wall, so that no uncontrolled liquid pockets can form between them.
  • the housing of the embodiment shown in FIGS. 1 to 4 of a metering pump designed as a capsule pump consists of a front end flange 1 (on the left in FIG. 1), a rear flange 2 (on the right in FIG. 1), and a cylindrical tube wall 3 extending axially therebetween , which is sealed off from the front end flange 1 by means of a seal 4, and four tensioning rods 5 with washers 6 and nuts 7 running outside the tube wall 3 between the flanges 1 and 2.
  • a base piece 8 designed as a concave molded part 8 is attached to the front end flange 1 by means of screws 9 and seals 10.
  • the base piece 8 and the remaining inner end face of the front end flange 1 form the fixed capsule wall of the metering pump.
  • an inlet 11 and an outlet 12 are formed in the fixed capsule wall, namely in the front end flange 1, an inlet 11 and an outlet 12 are formed.
  • the associated inlet check valve or outlet check valve can be installed in the connected inlet or outlet line (not shown).
  • the movable capsule wall is formed by a capsule membrane 13, which is clamped with its rear end region between a conical circumferential region of the rear flange 2 and an outer, in axial section, wedge-shaped clamping ring 14 placed thereon.
  • the pipe wall 3 is also connected to the rear flange 2 via the clamping ring 14.
  • the capsule membrane 13 further has a cylindrical section lying on the inside of the tube wall 3 and a front working area which, in the front position shown, complements the concavely curved wall of the base piece 8 and is bent back in the rearmost position, as shown in dashed lines.
  • the rear flange 2 of the metering pump represents a central flange, because it is adjoined (on the right in FIG. 1) by a pneumatic cylinder with a cylinder wall 20 which runs between the flange 2 and a cylinder end flange 21, the arrangement being held together by tie rods 22 .
  • the cylinder is designed as a pneumatic cylinder with a reciprocating double-acting piston 23, which is connected to the rear end of the actuating plunger 17 and drives it.
  • the right side of the piston 23 in FIG. 1 can be acted upon in order to move the actuating plunger 17 and thus the capsule membrane 13 into the foremost position, and via a compressed air connection 24 in the flange 2 and a subsequent axial bore the left side of the piston 23 in FIG. 1 can be pressurized in order to move the actuating plunger 17 and the capsule membrane 13 into the rearmost position.
  • the ball check valve 27 is, as shown, oriented so that when the piston 23 is pressurized on the right in FIG. 1, that is to say in the direction of forward movement, the ball check valve 27 opens and air through the axial tappet bore 25 and the radial outlet bore 26 into the space behind the capsule membrane 13 can emerge, which, like the right or rear side of the piston 23 in FIG. 1, is pressurized.
  • the capsule membrane 13 is therefore fully pressed against the bottom piece 8 so that no remaining liquid pockets can form between the bottom piece and the capsule membrane during the squeezing stroke.
  • a ball check valve 30, which is connected to the space behind the capsule membrane 13 and, seen from there, is biased in the closing direction, is inserted into the flange 2 and fastened to the flange 2 with screws 31. With this ball check valve 30, an outlet channel 32 is formed on the outlet side, formed in the flange 2, leading to the outside and shown in FIG. 4 (not visible in the sectional plane according to FIG. 1).
  • the outlet side of the ball check valve 31 is also connected via an axial bore 33 to the compressed air connection 24 formed in the flange 2, and a displaceable control piston 34 is seated in the bore 33.
  • the ball check valve 30 is biased in the closing direction so that when the space behind the capsule membrane 13 is pressurized, no compressed air can escape.
  • the control piston 34 in the bore 33 is designed so that when the compressed air connection 24 in the flange 2 is pressurized with compressed air on the right side in FIG. 1, it moves to the left and with its front end the valve ball of the ball check valve 30 counteracts the spring preload in the open position. So it is an unlockable ball check valve, and the function of the arrangement is as follows:
  • the piston 23 connected to the actuating plunger 17 is acted on in the forward direction (ie from the right in FIG. 1), namely by the compressed air connection 23 in the cylinder end flange 21, the capsule membrane 13 is pressed forward and at the same time the space behind the capsule membrane is pressurized.
  • the compressed air connection 24 in the flange 2 is depressurized.
  • the ball check valve 30 thus remains closed and the pressure behind the capsule membrane 13 cannot escape.
  • the outlet channel 32 serves to vent the space behind the capsule membrane 13.
  • the pressurization of the space behind the capsule membrane 13 during the forward stroke and the release of the pressure through the outlet channel 32 during the reverse stroke also causes a constant flushing of the space behind the capsule membrane, so that during operation Any small leakage that may occur does not remain in the pump and, even if it is aggressive substances, cannot attack or impair the pump mechanism.
  • seals 35, 36 and a lubrication groove 23a cooperating with the cylinder wall 20 and the plunger 17 are provided on the piston 23, and seals 37 and a lubrication groove 38 cooperating with the plunger on the flange 2.
  • FIG. 5 shows in axial section a modified embodiment of a metering pump designed as a capsule pump, which has further significant improvements compared to the embodiment described above with reference to FIGS. 1 to 4, which are described in more detail below.
  • the capsule pump embodiment according to FIG. 5 also has a front end flange 1, a rear flange 2, a cylindrical tube wall 3 running in between, seals 4, tension rods 5 with washers 6 and nuts 7, a base piece 8 and this fixing screws 9 and seals 10, an inlet 11 formed in the front end flange 1 and an outlet (not visible here), a capsule membrane 13 and a wedge-shaped clamping ring 14 which clamps them.
  • a pneumatic cylinder with a cylinder wall 20 and a rear cylinder end flange 21, in which a double-acting piston 23 is arranged, which is connected via an actuating plunger 17 the front part of the capsule membrane 13 is connected.
  • the actuating plunger 17 is fixed to the piston 23 by means of a nut 17a.
  • a compressed air connection 21a for acting on the piston 23 for the forward stroke is formed in the cylinder end flange 21; the compressed air connection to act on the other piston side for the reverse stroke is not shown because it is not in the plane of the drawing.
  • Seals 35, 36 and a lubrication groove 23a which cooperate with the cylinder wall 20 or the plunger 17, and seals 37 and lubrication grooves 38, which cooperate with the plunger, are again provided on the piston 23.
  • FIG. 5 is now intended to show some possible modifications of the basic embodiment described with reference to FIGS. 1 to 4 and in particular two essential further improvements.
  • the first significant improvement consists in the design of the base piece 8.
  • this is designed as a solid ring body, the central opening of which is large enough to accommodate the holding structure (15, 16) of the front end portion of the capsule membrane 13.
  • the base piece 8 in the embodiment according to FIG. 5 is equipped with a ring-like arrangement of channels 8a, which the space connected to the inlet 11 in the central opening of the annular base piece 8 with the radially outer transition region between the base piece end face facing the capsule membrane 13 and the Connect the inner wall of the cylindrical tube wall 3.
  • the second significant improvement evident from the arrangement according to FIG. 5 relates to the formation of the capsule membrane 13.
  • the capsule membrane is perforated at its front end in the embodiment according to FIG. 1 in order to be received between the shaped bodies 15 and 16 by the front end of the actuating plunger 17, in the embodiment according to FIG. 5 the front part of the capsule membrane is, so to speak the bottom area of the cup formed by the capsule membrane, continuously closed and without any opening, which of course requires a special type of fastening on the front plunger end, which will be described.
  • This completely closed design of the capsule membrane 13 ensures absolutely 100% sealing of the space in front of the capsule membrane and the space behind the capsule membrane.
  • the front middle part 13a of the capsule membrane which is formed into a bead, is fixed on a knob-like front holding structure of the fastening plunger 17.
  • this knob-like holding structure consists of a bead ring 41, which consists of moldable, for example rubber-like plastic, a mushroom-shaped holding cap 42, which is screwed onto the front end part of the actuating plunger 13 by means of a screw 43, and an annular counter-holding disk 44 with a concave arch front face.
  • a ring 46 On the outside of the bead wedge 13a of the capsule membrane 13 sits a ring 46, the inside diameter of which is smaller than the largest outside diameter of the bead ring 41 and the counter-holding ring 44.
  • the assembly takes place as follows:
  • the nut 45 located in the drawing behind the counter-holding ring 44 is first screwed on and turned to the rearmost position, then the Counter ring 44 placed, then the ring 46 is placed, and finally the bead ring 41 with the retaining cap 42 is screwed onto the front end of the actuating plunger 17.
  • the capsule membrane 13 is put on by threading its rear edge ahead between the bead ring 41 and the ring 46 and the counter-holding disk 44 (which is located at an axial distance from the bead ring 41).
  • the nut 45 is tightened, ie it rotates forward on the thread of the front actuating plunger end and tensions the counter-holder ring 44 against the bead ring 41.
  • the knob-like holding structure is firmly clamped together with the bead 13a of the capsule membrane 13.
  • an adjusting device 48 is attached with an adjusting screw 49, with which the suction stroke and thus the respective metering volume can be adjusted.
  • the front end of the adjusting screw 49 serves as a travel limit stop for the rear end of the actuating plunger 17th
  • the embodiment according to FIG. 5 further differs from the embodiment according to FIG. 1 in a modification of the compressed air loading of the space between the rear flange 2 and the capsule membrane 13.
  • the more complicated design in the embodiment according to FIG. 1 for loading this space via the 5 is replaced in the embodiment according to FIG. 5 by a compressed air connection 50 formed in the flange 2, via which the space behind the capsule membrane 13 can be synchronized with the ejection stroke loading of the piston 23 and also (with appropriate valve control) ) the ventilation can take place synchronously with the suction stroke of the piston 23.
  • actuating plunger 17 via another drive element, for example hydraulically or by an electric motor, or instead of via a double-acting compressed air piston to drive mechanically in any other way.
  • the pressurized air or relief is then carried out in the manner shown in Fig. 5 in synchronism with the lifting movements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Closures For Containers (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP96112488A 1995-08-07 1996-08-02 Pompe doseuse encapsulée Expired - Lifetime EP0758053B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29512694U 1995-08-07
DE29512694U DE29512694U1 (de) 1995-08-07 1995-08-07 Als Kapselpumpe ausgebildete Dosierpumpe

Publications (2)

Publication Number Publication Date
EP0758053A1 true EP0758053A1 (fr) 1997-02-12
EP0758053B1 EP0758053B1 (fr) 1999-10-06

Family

ID=8011484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96112488A Expired - Lifetime EP0758053B1 (fr) 1995-08-07 1996-08-02 Pompe doseuse encapsulée

Country Status (4)

Country Link
US (1) US5782617A (fr)
EP (1) EP0758053B1 (fr)
AT (1) ATE185402T1 (fr)
DE (3) DE29512694U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780451A1 (fr) * 1998-06-29 1999-12-31 Imaje Sa Pompe a membrane

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7097569B2 (en) * 2000-05-18 2006-08-29 Brobeck William I Restorable sand or pellet pile device
US6568926B1 (en) * 2001-10-31 2003-05-27 The Gorman-Rupp Company Fluid metering pump
WO2005001285A2 (fr) * 2003-06-26 2005-01-06 The Gorman-Rupp Company Pompe a membrane
US20090068032A1 (en) * 2005-05-10 2009-03-12 Pendotech Sanitary Diaphragm Pump for Critical Bioprocess Applications

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1767453A1 (de) * 1968-05-11 1971-09-16 Petrocarb Inc Verfahren und Vorrichtung zur pneumatischen Injektion fester Teilchen in eine Hochdruckzone
US3672791A (en) * 1970-07-17 1972-06-27 Ladish Co Pumping system with controlled liquid addition
FR2146019A5 (fr) * 1971-07-12 1973-02-23 Dorr Oliver Inc
FR2466640A1 (fr) * 1979-10-01 1981-04-10 Roser Erich Moteur a air comprime
EP0536818A1 (fr) * 1991-09-06 1993-04-14 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Pompe à membrane, en particulier pour des fluides contenant des gaz

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544239A (en) * 1968-11-25 1970-12-01 George C Graham Vacuum operated compound double-acting piston pump or compressor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1767453A1 (de) * 1968-05-11 1971-09-16 Petrocarb Inc Verfahren und Vorrichtung zur pneumatischen Injektion fester Teilchen in eine Hochdruckzone
US3672791A (en) * 1970-07-17 1972-06-27 Ladish Co Pumping system with controlled liquid addition
FR2146019A5 (fr) * 1971-07-12 1973-02-23 Dorr Oliver Inc
FR2466640A1 (fr) * 1979-10-01 1981-04-10 Roser Erich Moteur a air comprime
EP0536818A1 (fr) * 1991-09-06 1993-04-14 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Pompe à membrane, en particulier pour des fluides contenant des gaz

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780451A1 (fr) * 1998-06-29 1999-12-31 Imaje Sa Pompe a membrane
EP0969208A1 (fr) * 1998-06-29 2000-01-05 Imaje S.A. Pompe a membrane
US6267568B1 (en) 1998-06-29 2001-07-31 Imaje S.A. Diaphragm pump

Also Published As

Publication number Publication date
US5782617A (en) 1998-07-21
ATE185402T1 (de) 1999-10-15
DE29512694U1 (de) 1995-10-19
EP0758053B1 (fr) 1999-10-06
DE59603272D1 (de) 1999-11-11
DE29612987U1 (de) 1996-10-10

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