EP0367988A1 - Pompe à membrane - Google Patents

Pompe à membrane Download PDF

Info

Publication number
EP0367988A1
EP0367988A1 EP89118380A EP89118380A EP0367988A1 EP 0367988 A1 EP0367988 A1 EP 0367988A1 EP 89118380 A EP89118380 A EP 89118380A EP 89118380 A EP89118380 A EP 89118380A EP 0367988 A1 EP0367988 A1 EP 0367988A1
Authority
EP
European Patent Office
Prior art keywords
wall part
pump
diaphragm
shielding device
connecting rod
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
EP89118380A
Other languages
German (de)
English (en)
Other versions
EP0367988B1 (fr
Inventor
Erich Becker
Heinz Riedlinger
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.)
KNF Neuberger GmbH
Original Assignee
KNF Neuberger 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 KNF Neuberger GmbH filed Critical KNF Neuberger GmbH
Publication of EP0367988A1 publication Critical patent/EP0367988A1/fr
Application granted granted Critical
Publication of EP0367988B1 publication Critical patent/EP0367988B1/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
    • 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
    • F04B43/0081—Special features systems, control, safety measures
    • F04B43/009—Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid
    • 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

Definitions

  • the invention relates to a diaphragm pump according to the preamble of claim 1.
  • diaphragm pumps with a pump housing and a pump diaphragm clamped between parts of this pump housing and which is moved by a connecting rod (eg DE-OS 30 05 834) are already known.
  • Such diaphragm pumps are also manufactured in a double version with two pump parts and, for example, an electric motor in between.
  • Such diaphragm pumps have proven themselves well for numerous applications, for example for generating negative pressure or as a compressor.
  • Such pumps equipped with a pump membrane also have disadvantages, particularly with regard to their noise generation.
  • the pump membrane emits not insignificant noises, in particular because of the oscillatory movements imposed on it by the connecting rod, but also because of vibrations occurring on the pump membrane itself.
  • Diaphragm pumps of the type mentioned have been built for a long time and not seldom z. B. used in investigation laboratories and there in the presence of several, often highly precise and concentrated people working noise disturbing. This is especially true if e.g. B. a membrane pump is "driven" from the negative pressure area into the positive pressure area. This can lead to an increase in noise emissions of up to 40% compared to normal pump operation.
  • the solution to this problem according to the invention consists in particular in a diaphragm pump of the type mentioned at the outset that a noise shielding device is provided between the pump diaphragm and the part of the pump housing remote from the pump diaphragm, which protects the pump diaphragm seals off the distant part of the pump housing against the pump diaphragm.
  • the noise shielding device has a flexible, flat wall part, which is preferably attached with its outer edge in the pump housing and expediently with the edge of an approximately central opening on the connecting rod, expediently at the connecting rod head, in such a way that from the noise Shielding device emit at least lower noise-relevant vibrations than from the pump membrane, preferably practically no such vibrations.
  • the noise shielding device has an elastic spacer between the wall part and the connecting rod head or the like. This measure further reduces the noise-generating vibrations of the flat wall part of the noise shielding device.
  • the spacer consists of an elastic ring or the like. Made of foam rubber or the like. Resilient and at the same time sound-absorbing material. Then an additional damping of the sound emanating from the pump membrane takes place in the elastic ring made of foam rubber or the like. Sound-absorbing material.
  • the elastic spacer can also consist essentially of elastic projections, ribs or the like which are approximately perpendicular to the plane of the noise shielding device and are attached to the wall part, which is preferably formed by a circular disk.
  • the elastic spacer preferably the elastic projections, can be connected in one piece to the elastic wall part, in particular the pane, and essentially form the noise shielding device.
  • Both a continuous one-piece formation of elastic ring including its projections on the one hand in connection with the flat wall part and an adhesive connection between such parts is possible.
  • the continuous one-piece design simplifies both manufacture and assembly.
  • the gluing of an elastic ring, for example made of foam rubber, to the flat wall part enables the production of a coherent noise shielding device from two different working materials, each with advantageous material properties, and at the same time a simplified assembly.
  • Cooling in the crankcase is possible without increasing and even reducing the noise emission, and this means a longer service life for the pump diaphragm and the ball bearings.
  • a straight line of cooling air through the crankcase and the electric drive motor of the pump motor unit is also possible with two-head in-line pumps.
  • practically no change in the noise emissions emanating from the pump membrane occurs within different operating ranges, e.g. when generating different negative and / or positive pressures.
  • a pump 1 shown in FIG. 1 is designed as a diaphragm pump. It has a pump housing 2, which essentially consists of a crankcase 3, a clamping plate 4 and a head plate 5. A pump membrane 6 is clamped on its outer edge between the clamping plate 4 and the top plate 5. Inlet and outlet ducts 8 and 9 open into the working space 7 delimited by the top plate 4 and the pump diaphragm 6.
  • the pump membrane 6 is connected to a connecting rod head 10, which in turn is attached to a connecting rod 11, which transmits the stroke movement coming from a crank drive 12 to the connecting rod head and the pump membrane.
  • a noise shielding device 13 is now provided between the pump membrane 6 and the part of the pump housing 2 remote from the pump membrane.
  • This shielding device 13 shields the pump-remote part of the pump housing from the pump diaphragm 6 in a sound-absorbing manner. Noises emanating from the pump diaphragm 6 are damped by this shielding device and kept away from the crank chamber 14. Noise emission to the outside is thus prevented even when cooling measures of the crank chamber 14 are provided. The cooling, in turn, enables a longer service life for the diaphragm and bearings.
  • FIG. 1 An embodiment of the noise shielding device 13 is shown in FIG. 1.
  • a membrane-like, flexible wall part 15 is provided, which is kept at a distance from the crank chamber-side underside 17 of the connecting rod head 10 by an elastic ring 16.
  • the elastic ring 16 forms a spacer 18.
  • the elastic ring 16 is dimensioned such that the wall part 15 which provides a noise-shielding is prestressed to such an extent that this preload is greater than the pressure alternating loads acting on the wall part 15 which emanate from the pump diaphragm 6.
  • the wall part 15 thus oscillates to match the connecting rod movement, but is virtually free of natural vibrations and thus does not represent a source of noise with respect to the crank chamber 14.
  • the elastic ring is preferably made of foam rubber or the like, as a result of which, on the one hand, the flexibility for the pretensioning of the wall part 15 and, at the same time, a sound-absorbing effect is achieved.
  • the membrane-like wall part 15 is clamped with its outer edge 19 between the crankcase 3 and the clamping plate 4.
  • the wall part 15 has a central opening 20 through which the connecting rod 11 extends. In this area it can also be seen that the inner edge of the wall part 15 rests on a connecting rod shoulder 21 at the opening 20 and is clamped from the other side by a sleeve 22 which is supported on the lower side of the connecting rod head 17.
  • the radial extension of the elastic ring 16 can protrude beyond that of the connecting rod head and, as indicated by dashed lines, can also approach the inner wall of the clamping plate 4. As a result, this noise-damping part is practically a ge The entire clear cross section of the damping part and the shielding part are present.
  • the outer diameter of the connecting rod head is denoted by d and that of the elastic ring by D.
  • FIGS. 2 and 3 show a modified embodiment of a noise shielding device 13a, in which the spacer 18 is integrally connected to the wall part 15 on the side of the connecting rod head 10 facing it.
  • the spacer 18 is formed here by rib-shaped and approximately radially extending elastic projections 23. These projections 23 rest against the shape-matched underside 17a under prestress, so that here too the membrane can practically not be excited by the vibrations of the pump membrane 6. This also ensures here that the damping membrane 14 adopts the stroke movement of the connecting rod 11, but on the other hand does not carry out any natural vibrations.
  • an insert part made of foam rubber or the like which may be in the form of a molded part, can also be provided in order to provide sound absorption in addition to the vibration damping of the wall part 15.
  • the position of the clamping points of the wall part 15 on the one hand on the outer edge 19 and on the other hand in the connecting rod 11 relative to the connecting rod underside 17 or 17a is dimensioned such that the space between the underside 17 or 17a and the relaxed wall part 15 is smaller than the thickness of the spacer 18.
  • the wall part 15 of the noise shielding device 13 can be pre-shaped or arched approximately in the shape of a plate, as can be seen in FIG. 1, but in particular in FIG. 2.
  • This preforming results in defined deformation ratios in the transverse movements occurring due to the connecting rod tilting movement. If one were to deflect a flat wall part in the lateral direction, this would oppose the deflection movement to a much greater rigidity.
  • the plate-shaped preforming reduces these resistance forces opposing the connecting rod deflection movement, since the "stiffness" of the wall part in the side deflection direction is significantly lower.
  • the power requirement for driving the pump is reduced accordingly.
  • the preforming can be achieved at the same time by the prestress provided, so that the wall part can form a flat plate before installation, which is then preformed and pre-stressed accordingly in the installed position. Excess material extension is provided in this plate 15 in the radial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP89118380A 1988-11-10 1989-10-04 Pompe à membrane Expired - Lifetime EP0367988B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3838141 1988-11-10
DE3838141A DE3838141C2 (de) 1988-11-10 1988-11-10 Membranpumpe

Publications (2)

Publication Number Publication Date
EP0367988A1 true EP0367988A1 (fr) 1990-05-16
EP0367988B1 EP0367988B1 (fr) 1992-08-05

Family

ID=6366888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118380A Expired - Lifetime EP0367988B1 (fr) 1988-11-10 1989-10-04 Pompe à membrane

Country Status (4)

Country Link
US (1) US4993925A (fr)
EP (1) EP0367988B1 (fr)
JP (1) JP2848872B2 (fr)
DE (2) DE3838141C2 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5092224A (en) * 1990-01-26 1992-03-03 Thomas Industries Conical rod piston
DE4119228C2 (de) * 1991-06-14 1995-04-13 Knf Neuberger Gmbh Membranpumpe
DE4328559C5 (de) * 1993-08-25 2004-11-25 Knf-Neuberger Gmbh Membranpumpe mit wenigstens zwei Membranen
US5437218A (en) * 1994-04-04 1995-08-01 Pcm Pompes Diaphragm pump having variable displacement
DE19519763C2 (de) * 1995-05-30 1999-08-05 Pari Gmbh Inhalationsgerätekompressor mit verbessertem Membransatz
EP1048849B1 (fr) * 1996-06-07 2005-03-16 Hydro Leduc Pompe à haute pression pour tous liquides
US5894784A (en) * 1998-08-10 1999-04-20 Ingersoll-Rand Company Backup washers for diaphragms and diaphragm pump incorporating same
KR100291161B1 (ko) * 1998-08-14 2001-06-01 김성철 다이어프램펌프
FR2794811B1 (fr) * 1999-06-08 2003-02-07 Peugeot Citroen Automobiles Sa Pompe a haute pression a etancheite perfectionnee
US6279421B1 (en) * 1999-08-26 2001-08-28 Gast Manufacturing, Inc. Connecting rod assembly with reduced length variability
ATE368181T1 (de) * 2001-01-02 2007-08-15 Medela Holding Ag Membranpumpe
JP2005344569A (ja) * 2004-06-01 2005-12-15 Toyota Industries Corp ポンプ
JP4114639B2 (ja) * 2004-06-01 2008-07-09 株式会社豊田自動織機 ダイヤフラム型ポンプ
EP2196229A1 (fr) * 2008-12-12 2010-06-16 Koninklijke Philips Electronics N.V. Tête motorisée pour tire-lait
US8708308B2 (en) * 2009-08-05 2014-04-29 Itt Manufacturing Enterprises, Inc. Sealing arrangement for a diaphragm valve
TW201139849A (en) * 2010-05-13 2011-11-16 Tricore Corp Inflating pump with integrally formed air bag and inlet/outlet valve
EP2921705B1 (fr) * 2014-03-20 2018-09-05 Annovi Reverberi S.p.A. Groupe plaque-diaphragme pour pompes à membrane
EP3146211A4 (fr) * 2014-05-20 2018-02-14 Ying Lin Cai Structure de rondelle excentrique pour pompe à diaphragme de compression à effets multiples
US9677557B2 (en) * 2015-01-20 2017-06-13 Hao Hsu Sleeping system
CN105626487B (zh) * 2015-12-24 2018-04-20 广东基泰智能设备有限公司 无脉动柱塞泵

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE349867A (fr) *
US3263618A (en) * 1964-04-21 1966-08-02 Gen Motors Corp Windshield washer pump
US3877842A (en) * 1970-01-21 1975-04-15 Itt Air pumps
DE2502566A1 (de) * 1975-01-23 1976-07-29 Erich Becker Membran-pumpe
US4050861A (en) * 1974-05-30 1977-09-27 Toyota Jidosha Kogyo Kabushiki Kaisha Diaphragm pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035107A (en) * 1975-04-07 1977-07-12 Durotech Co. Pump system for high pressure abrasive liquids
DE2618786C2 (de) * 1976-04-29 1978-10-12 Bau- Und Industrietechnik Gmbh, 2000 Hamburg Verdrängungspumpe mit Membran
JPS5592089U (fr) * 1978-12-20 1980-06-25
DE3005834A1 (de) * 1980-02-16 1981-09-03 Becker, Erich, 7812 Bad Krozingen Pumpe mit von druckdifferenzen des gasfoermigen foerdermediums gesteuerten ventilen
FR2517378B1 (fr) * 1981-11-28 1988-03-11 Becker Erich Pompe a membrane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE349867A (fr) *
US3263618A (en) * 1964-04-21 1966-08-02 Gen Motors Corp Windshield washer pump
US3877842A (en) * 1970-01-21 1975-04-15 Itt Air pumps
US4050861A (en) * 1974-05-30 1977-09-27 Toyota Jidosha Kogyo Kabushiki Kaisha Diaphragm pump
DE2502566A1 (de) * 1975-01-23 1976-07-29 Erich Becker Membran-pumpe

Also Published As

Publication number Publication date
JPH02176172A (ja) 1990-07-09
DE3838141C2 (de) 1998-12-24
EP0367988B1 (fr) 1992-08-05
US4993925A (en) 1991-02-19
DE3838141A1 (de) 1990-05-17
JP2848872B2 (ja) 1999-01-20
DE58901989D1 (de) 1992-09-10

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