EP0280070A2 - Pompe à membrane double - Google Patents

Pompe à membrane double Download PDF

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Publication number
EP0280070A2
EP0280070A2 EP88101422A EP88101422A EP0280070A2 EP 0280070 A2 EP0280070 A2 EP 0280070A2 EP 88101422 A EP88101422 A EP 88101422A EP 88101422 A EP88101422 A EP 88101422A EP 0280070 A2 EP0280070 A2 EP 0280070A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
membrane
pump
edge
pump according
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.)
Withdrawn
Application number
EP88101422A
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German (de)
English (en)
Inventor
Dirk Dipl.-Ing. Budde
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.)
DEPA Gesellschaft fuer Verfahrenstechnik mbH
Original Assignee
DEPA Gesellschaft fuer Verfahrenstechnik mbH
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 DEPA Gesellschaft fuer Verfahrenstechnik mbH filed Critical DEPA Gesellschaft fuer Verfahrenstechnik mbH
Publication of EP0280070A2 publication Critical patent/EP0280070A2/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel

Definitions

  • the invention relates to a double diaphragm pump, consisting of a pump housing with two two-part housing chambers, which are arranged next to each other at a distance and each have a membrane arrangement and are divided by this into a pump chamber and an air chamber, the air chambers being aligned with one another and between them Compressed air control device, which is able to alternately supply compressed air to the two air chambers or to discharge it from the air chambers, the pump chambers being connected via valve devices to a suction device and a delivery device, due to which the pumped due to the membrane movement that can be generated by the compressed air Material can be sucked into the pump chambers or pushed out of the pump chambers, and the membrane arrangement consists of an annular flexible membrane disk with a bead-like thickened area on the outer and / or inner ring edge, which membrane ring disk with its outer edge between the two halves of the associated housing chamber or with the inner Edge between membrane plates held by a piston rod is clamped pressure-tight.
  • Such a double diaphragm pump is already known, for example, from DE-OS 33 10 131 by the applicant.
  • a double diaphragm pump that works with a diaphragm that does not have thickenings is shown in US Pat. No. 4,381,180.
  • Both embodiments, as well as double diaphragm pumps that have already become known, work very reliably, but still have certain disadvantages in special applications. For example, when used in the food sector, in particular in the dairy industry, it has been found that blind spots form at the clamping points for the membrane, into which residues of the pumped material, for example thickened protein, are deposited and can lead to contamination of subsequently pumped material.
  • Another disadvantage of the known arrangement occurs when used in media containing solids. The solid particles can in turn deposit in the corners formed by the membrane and the clamping devices and lead to the fact that the membrane which is bent back and forth during the pumping process is weakened by abrasion at this point and the entire membrane is destroyed over time.
  • the object of the invention is to improve the double diaphragm pump of the type mentioned in such a way that the disadvantages described above no longer occur, ie that no spaces remain between the diaphragm and the devices clamping the diaphragm in which the diaphragm interferes with its movement and so that the membrane can hold destructive solid particles in the long run and in which even non-organic substances solidify under pressure and lead to disturbing deposits.
  • the pump should be suitable for conveying goods that are as sensitive as milk products, as a result of their particular consistency due to the action of pressure can be changed particularly easily in an unfavorable manner and can lead to deposits which decompose over time and infect the subsequent product.
  • the bead-like thickened edge on the ring side facing the pump chamber carries a thickening or stiffening which reduces the flexibility of the membrane and which forms an obtuse angle with the edge of the associated housing half or the associated membrane plate in all operating positions of the membrane.
  • This measure ensures that solid particles can not settle in the area between the membrane and membrane attachment, and sensitive organic materials that are to be promoted are not exposed to any pinching effect, so that, for example, there is no risk of milk being cheesed off by milk and deposits and after subsequent decomposition subsequent milk is infected with the decomposition products and bacteria.
  • the thickening can form a radial profile which, on the side facing the pump chamber, starting from the non-thickened membrane profile center, initially forms approximately a partial circle at the beginning of the thickening, which is tangential to the non-thickened membrane part on the one hand and tangential on the other hand opens into a line that is approximately parallel to the pump chamber axis.
  • This arrangement has proven to be particularly advantageous because, on the one hand, it moves the flexible area of the membrane and thus the area of the membrane that is moving during the pumping process away from the clamping points, on the other hand, this arrangement enables a tight transition with an obtuse angle to the enclosing ones Areas of the jigs.
  • the clamping is particularly effective and tight if, according to yet another embodiment, the radial profile has an approximately rectangular depression that springs back from the tangential line to the line parallel to the pump chamber axis.
  • one side of the depression can be formed perpendicular to the tangential line and the other side can spring back parallel to the tangential line, and the latter other side can merge into an oblique clamping surface via a rounded acute-angled bend. The latter facilitates pressure-tight and secure clamping and in this way increases the compressive strength of the arrangement without the risk that material to be pumped will penetrate into the clamping plane.
  • the thickening on the side facing the air chamber constitutes a partial circle with sloping or rounded end regions, the partial circle beginning in particular at the ring outer edge at the level of the recessed depression surface or at the inner ring edge of the Pitch circle forms a narrow, higher than wide bead.
  • the membrane can have a fabric insert that runs approximately in the center in the membrane profile middle area and in the thickened areas.
  • a fabric insert which is customary per se, can also be used with advantage in the subject matter of the invention because it increases the strength of the membrane considerably without significantly impairing the flexibility of the membrane.
  • the displacement of the bending areas away from the clamping surfaces can also be achieved in that near these clamping areas the material from which the membrane is made is less bendable has what can be achieved not only by thickening the material, but also by additional deposits of agents that increase the bending stiffness.
  • Special profile shapes have proven to be particularly favorable, for example an embodiment in which the diaphragm on the pump side is made of PTFE and a partial circle penetrating into the thickening at the level of the recessed depression surface is present to accommodate the thickened edge of an existing one made of elastomer , second diaphragm on the air chamber side.
  • a PTFE membrane is particularly suitable for aggressive materials to be pumped, which would only attack an elastomer membrane too strongly.
  • the elastomer membrane arranged behind is used to give the PTFE membrane sufficient dimensional stability.
  • the diaphragm plate will have an edge cross-section adapted to the diaphragm inner edge profile such that the plate outer edge surface merges directly into the diaphragm surface running tangentially parallel to the pump chamber axis or forms an obtuse angle.
  • the edge of the housing half on the pump side can also have an edge cross section adapted to the outer edge of the diaphragm, such that the edge of the housing merges with the surface of the diaphragm tangentially parallel to the axis of the pump housing or forms an obtuse angle.
  • Both embodiments are particularly inexpensive because they make a prior art pump particularly suitable for the above-described applications without much additional effort.
  • the plate on the pump chamber side can preferably be a cast body (for example made of cast stainless steel) with axially attached threaded bolts, which has the advantage that the membrane plate in the direction of the pump chamber manages without gaps and additional seals.
  • the membrane plate made of cast material preferably has stiffening ribs on the side facing the air chamber and a relatively smooth metal surface with rounded edges that can be easily polished.
  • the membrane plate head is provided with a somewhat protruding polygonal projection, again with rounded corners, such as in particular a square. A tool can be attached to this square if the diaphragm plate is to be screwed out of the piston rod with its bolt.
  • FIG. 1 shows, in a partially sectioned axial view and in a cross-sectional view, a compressed air-operated double diaphragm pump 10, consisting of a pump housing 12 with two spaced-apart housing chambers 14, each having a diaphragm device 16 and from this into a pump chamber 18 and an air chamber 20 are divided, the two air chambers 20 being aligned with one another and having between them a compressed air reversing block 22 which, for. B. supplied from above, pressurized working air, the two air chambers 20 alternately.
  • the pump chambers are connected via ball valve devices 30 to a common suction port 32, which in turn is connected to a storage container supplying the medium to be conveyed, and via further valve devices 28 to a common pressure port 34, which is connected to the device, which is connected to this promotional good is to be delivered.
  • the membrane devices 16 each comprise two membrane support plates 36, 37, which are each screwed onto the end of a membrane piston 38 and hold an annular membrane 40 made of flexible material on their inner border 41 between them, while the outer border 43 of the annular membrane 40 between the edges of correspondingly shaped parts of the pump housing 12, see e.g. B. the housing part 21 is kept pressure-tight.
  • the pressurized working air passes from the connection 44, for example according to FIG. 1, into the right air chamber 20 on the air chamber side of the membrane device 16, whereupon the pressurized air moves the membrane device 16 to the outside and thus that Conveyed material from the pump chamber 18 via the upper ball valve 28 into the pressure port 34.
  • the membrane device on the other (left) side is pulled inwards and new product is sucked out of the suction port 32 through the lower, left ball valve into the left pump chamber.
  • the left air chamber 20 is connected via a channel to an outlet 46 which preferably opens into the free atmosphere.
  • a double diaphragm pump 10 according to the invention is shown in a partially axially sectioned view in FIG. 2, again showing the pump housing 12 with the two two-part housing chambers 14, which are arranged next to one another at a distance and one each of the housing chambers in a pump chamber 18 and have an air chamber 20 dividing membrane assembly 16.
  • the compressed air control device 22 can also be seen, with a compressed air inlet 44 and a compressed air ventilation or a compressed air outlet 46, which is designed here as a silencer to reduce the explosive outflow noise.
  • the membrane piston 38 is mounted in a sliding bush 35 in the housing 42 of the block-like compressed air reversing device 22.
  • the housing parts 21 on the air chamber side are fastened to the housing block 42 by means of countersunk screws 45, each with sealing washers 26 ensuring that no compressed air leakage losses occur.
  • an annular flexible membrane 40 is clamped with a bulge-like region 48 lying on the outer edge of the ring, the outer edges of the two housing parts 21, 23 being adapted to the shape of the bulge 48 and to the outside form a slightly tapered circumferential ring, which is enclosed by a profile tapering inwardly trough-shaped clamping ring 50.
  • the tensioning ring 50 is tensioned via a tensioning screw 52 which can be seen on the left-hand side of FIG. 2 and which pulls the two ends of the tensioning ring 50 towards one another.
  • the pump housing can have a drainage device for condensed water, an overpressure safety valve or a diaphragm rupture monitoring device, for example in the form of component 54.
  • this membrane is clamped between the membrane plates 36, 37, the edges of the membrane plates again having radial cross sections adapted to the bead shape of the membrane 40.
  • the diaphragm plate 36 on the pump side axially carries a screw bolt 58 which can be screwed into a corresponding axial threaded bore 60 of the piston 38, the diaphragm plate 36 thereby simultaneously pressing the diaphragm plate 37 against the front end of the piston 38.
  • the upper and lower halves of FIG. 2 are designed differently with regard to the membrane arrangement 16, in particular with respect to the actual membrane 40.
  • the upper half of the figure shows an embodiment in which an annular membrane 40 made of an elastomer is provided, while the lower half shows a membrane 140 consisting of an elastomer part 141 and a part 142 made of PTFE (polytetrafluoroethylene).
  • the lower embodiment is particularly suitable for aggressive media to be conveyed, such as solvent-containing substances.
  • the membrane plates 36, 37 are preferably made of metal, such as die-cast aluminum, chrome-plated brass or stainless steel. 1
  • both the inner (air chamber side) and the outer (pump side) diaphragm plate have an axial opening for receiving a fastening bolt 57 which presses the two diaphragm plates 36, 37 together and in turn presses this overall arrangement against the end face of the diaphragm piston 38.
  • a fastening bolt 57 which presses the two diaphragm plates 36, 37 together and in turn presses this overall arrangement against the end face of the diaphragm piston 38.
  • the prismatic circumferential shape has, for example is square, as in FIG. 4, a partial view from the left on the also in a partial sectional view reproduced individual representation of the outer membrane plate can be seen.
  • a tool can be attached to this prismatic attachment 62 and the plate can thereby be rotated.
  • a sleeve 66 extends from the bottom of the shoulder 62 and forms a threaded blind bore 68 in its interior into which a fastening bolt 58 can be screwed.
  • a screw bolt can also be pressed in, as is also shown in FIGS. 2, 3 and 4.
  • the outer membrane plate 36 according to FIG. 2 is designed somewhat differently than the embodiment shown in FIGS. 3 and 4, the plate according to FIG. 2 having a strong cup-like basic shape, this in adaptation to the likewise curved embodiment of the housing part 23, which housing shape allows particularly favorable flow conditions, which are particularly important for sensitive products such as milk products. In the case of a flat housing, as shown in FIG. 1, this feature of the diaphragm plate is of secondary importance.
  • the inner diaphragm plate 37 has an axial opening for receiving the bolt 58 and a frusto-conical projection 70 arranged around this opening, which results in an even more precise guidance of the diaphragm plate with respect to the bolt and possibly forms a stop surface for the end face of the sleeve 66 if one wants to ensure that the membrane bead 56 is provided with a precisely defined annular channel, formed by the opposing two membrane plates 36, 37, namely when the end face of the extension 70 on the end surface of the extension 66 when screwing the membrane plate combination onto the Piston 38 comes on.
  • one (or preferably several, for example six, for example, six radially uniformly distributed) cams 74 could emanate from one of the membrane plates, for example from the inner membrane plate 37, which cam extends into a corresponding opening of an inner bead 56 of the membrane 40 again flatter part 76 is provided. If a two-part embodiment is used for the membrane, as shown in FIG.
  • an elastomeric membrane 40 can be seen in a radial sectional view, which is additionally provided with a fabric insert 80.
  • the inner thickening 41 (as well as the outer thickening 43) forms a radial profile starting on the side facing the pump chamber (according to the illustration in FIG. 5, this is the side to the right of the membrane) from the non-thickened center of the membrane profile, initially at the beginning of the thickening, approximately a pitch circle 82 or 83 with a radius of curvature which depends on the size of the membrane and is of the order of 4 mm in the membrane shown here, i.e.
  • the pitch circle 82 or 83 opens on the one hand tangentially into the non-thickened central membrane area, reference number 84, and on the other hand tangentially into a line 86 or 87 which is approximately parallel to the pump chamber axis 88. After assembly, the peripheral edge 90 of the outer membrane plate 36 or the inner edge 92 of the housing edge of the housing part 23 lies on this line.
  • the radial profile then forms an approximately rectangular depression 94 or 95, which springs back approximately perpendicularly from the tangential line 86 or 87 parallel to the pump chamber axis 88 and, during assembly, a corresponding annular nose 96 of the edge of the outer plate 36 or a corresponding annular nose 97 of the housing edge of the housing 23 receives.
  • This depression 94 or 95 is perpendicular to the tangential line 86 or 87, and the other side springing back parallel to this tangential line, the latter other side passing over a rounded acute-angled bend into an oblique clamping surface 98 or 99, which is formed by a correspondingly shaped clamping surface of the edge of the diaphragm plate 36 or the edge of the housing 23 is added.
  • the thickening on this area can be unproblematic with regard to the jamming of material particles by a pitch circle oblique or rounded end areas can be realized.
  • the partial circle is realized by the thickening area 100 and an obliquely tapering end area by the area 102.
  • the thickening in turn consists of a partial circle 104 which connects a first surface 106 perpendicular to the axis and a further surface 108 which slopes slightly inwards.
  • the pitch circle 100 begins at the level of the recessed depression surface 95. This has advantages in terms of fastening technology, since devices that generate fastening pressure are located on both sides opposite one another at approximately the same level.
  • the partial circle 104 lying on the inner bead 41 forms, as can also be seen, a narrow bead which has a greater height than its width and is therefore almost lip-like, which benefits the pressure tightness with respect to the drive compressed air.
  • the membrane edges are both on the outside and on the inside Bead axially cut off and the resulting edges 110, 112 are preferably of a width that could correspond to the radius of curvature of the partial circles 82, 83.
  • the PTFE membrane shown in FIG. 6 has essentially the same configuration in the direction of the pump chamber as was described for the membrane of FIG. 5.
  • the elastomer membrane to be attached on the air chamber side could then be designed such that the profile shape of FIG. 5 results from the combination of the PTFE membrane with the elastomer membrane. It has proven particularly useful to provide an annular depression 114 at least on the outer edge of the PTFE membrane, into which a correspondingly spherical bead 116 (see FIG. 2) of an elastomer membrane 141 can be inserted.
  • a corresponding design can also have the inner edge of the PTFE membrane according to FIG. 6, as can be seen in FIG. 2 at 118.
  • FIG. 7 A still further embodiment is shown in FIG. 7, in which the PTFE membrane 140 has the shape shown in FIG. 6, while the elastomer membrane 141 has an extension 120 that extends to the membrane plate axis.
  • the diaphragm plate 236 according to FIG. 3 is used in connection with an inner diaphragm plate 237, which is designed similarly to the diaphragm plate 37, but has an inclined contact surface 122 for the diaphragm extension 120.
  • the illustration in FIG. 7 shows particularly clearly that the design according to the invention of the membrane beads as well as the associated clamping devices in the area of the pump side only provides surfaces which are straight or have a relatively large radius of curvature; , see the reference numbers 124, 126. Thus there are no dead corners in which material can be held, and there are none Areas that constantly narrow and expand due to the membrane movement, and thus pinch material and - what happens with organic material - change in an undesired manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP88101422A 1987-02-26 1988-02-02 Pompe à membrane double Withdrawn EP0280070A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8702941U DE8702941U1 (de) 1987-02-26 1987-02-26 Doppelmembranpumpe
DE8702941U 1987-02-26

Publications (1)

Publication Number Publication Date
EP0280070A2 true EP0280070A2 (fr) 1988-08-31

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ID=6805218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101422A Withdrawn EP0280070A2 (fr) 1987-02-26 1988-02-02 Pompe à membrane double

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EP (1) EP0280070A2 (fr)
JP (1) JPS63230976A (fr)
DE (1) DE8702941U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550810A3 (fr) * 1991-11-08 1994-03-23 Almatec Tech Innovationen Gmbh
EP0775825A3 (fr) * 1995-11-27 1998-06-10 Ingersoll-Rand Company Membrane de pompe
EP0809028A3 (fr) * 1996-05-23 1999-06-02 Graco Inc. Membrane de pompe
EP0916846A3 (fr) * 1997-11-18 1999-06-09 Westinghouse Air Brake Company Anneau d'usure pour une membrane et support en forme de piston
WO2024115010A1 (fr) * 2022-12-01 2024-06-06 Robert Bosch Gmbh Pompe à diaphragme

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007932A1 (de) * 1990-03-13 1991-09-19 Knf Neuberger Gmbh Membranpumpe mit einer formmembrane
WO1993018305A1 (fr) * 1992-03-05 1993-09-16 Joe Santa & Associates Pty. Limited Pompe, soupape de commande et diaphragme

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550810A3 (fr) * 1991-11-08 1994-03-23 Almatec Tech Innovationen Gmbh
EP0775825A3 (fr) * 1995-11-27 1998-06-10 Ingersoll-Rand Company Membrane de pompe
EP0809028A3 (fr) * 1996-05-23 1999-06-02 Graco Inc. Membrane de pompe
EP0916846A3 (fr) * 1997-11-18 1999-06-09 Westinghouse Air Brake Company Anneau d'usure pour une membrane et support en forme de piston
WO2024115010A1 (fr) * 2022-12-01 2024-06-06 Robert Bosch Gmbh Pompe à diaphragme

Also Published As

Publication number Publication date
JPS63230976A (ja) 1988-09-27
DE8702941U1 (de) 1987-05-07

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