EP0132913A1 - Pompe à membrane ou à piston - Google Patents

Pompe à membrane ou à piston Download PDF

Info

Publication number
EP0132913A1
EP0132913A1 EP84302390A EP84302390A EP0132913A1 EP 0132913 A1 EP0132913 A1 EP 0132913A1 EP 84302390 A EP84302390 A EP 84302390A EP 84302390 A EP84302390 A EP 84302390A EP 0132913 A1 EP0132913 A1 EP 0132913A1
Authority
EP
European Patent Office
Prior art keywords
diaphragms
chambers
pump
valve
partition member
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
EP84302390A
Other languages
German (de)
English (en)
Other versions
EP0132913B1 (fr
Inventor
Derek Noel Marchant
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.)
FLOTRONICS AG
Original Assignee
FLOTRONICS AG
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 FLOTRONICS AG filed Critical FLOTRONICS AG
Priority to AT84302390T priority Critical patent/ATE31966T1/de
Publication of EP0132913A1 publication Critical patent/EP0132913A1/fr
Application granted granted Critical
Publication of EP0132913B1 publication Critical patent/EP0132913B1/fr
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
    • F04B43/06—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 pumps and has a particularly useful but not exclusive application in pumps of the kind known as double diaphragm pumps.
  • a pump comprising a hollow casing closed at its ends, two diaphragms or pistons disposed within the casing and generally parallel to each other adjacent the respective end portions of the casing, each diaphragm or piston forming with its adjacent end portion of the casing a closed first chamber, a fixed internal partition member disposed between the diaphragm or pistons and forming two closed second chambers with the respective diaphragms or pistons, said second chambers having inlets thereto controlled by respective valves and outlets therefrom controlled by respective valves, a push rod extending in a sealing manner through the partition member to transmit axial displacing forces between the diaphragms or pistons, and valve means actuated in dependence on the position of the diaphragms and adapted to open passages for connecting each of the two first chambers alternately to a source of pressure fluid and to exhaust, thereby to cause the push rod and diaphragms or pistons to reciprocate in unison and to cause the di
  • inlet passages providing the inlets to said second chambers and outlet passages providing the outlets from said second chambers are formed in the partition chamber.
  • said inlet passages are constituted by branch passages extending from a common inlet opening in the casing
  • said outlet passages providing the outlets from said second chambers are constituted by branch passages extending from a common outlet opening in the casing, the valves associated with second chambers being mounted in the branch passages.
  • the two ends of said push rod may advantageously be in abutting relationship with the two diaphragms or pistons respectively and are not necessarily connected to the diaphragms.
  • said end portions of the casing are formed by respective end members which are detachably secured to the partition member, and the two diaphragms or pistons are respectively removably attached at their peripheries to the adjacent end members.
  • diaphragms may have a reinforcing plate embedded in the central region thereof.
  • the pump has an external casing formed by a hollow cylindrical support- ring 10 to opposite ends of which end covers 11, 12 are secured by tie bolts or, where frequent cleaning of the pump is necessary, quick-release clamps.
  • a cylindrical diaphragm ring 13 of the same axial length as the support ring 10 enclosed within the support ring and a transverse partition member 14 is in turn enclosed within the diaphragm ring.
  • Two diaphragms 16, 17 having a peripheral bead 18 are respectively clamped between opposite axial ends of the support ring 13 and partition member 14 at one side and the two end covers 11, 12 at the other side.
  • the bead 18 itself is accommodated in channel section grooves in the support ring and the end cover.
  • the groove in the end cover may have a dovetail section (not shown) and the bead may have a correspondly shaped portion which engages in the groove and serves to attach the diaphragm removably to the adjacent end cover.
  • Each diaphragm 16, 17 divides the space between the adjacent end cover 11, 12 and the partition member 14 into two chambers 19, 20.
  • the two axially outer chambers 19 constitute motor chambers and the two axially inner chambers 20 constitute pumping chambers.
  • Each diaphragm has its central region stiffened by a reinforcing disc 21 embedded in the diaphragm material and a push rod 22 which is a sliding sealing fit in two sealing rings 23 in the partition member has its ends in abutment with the two diaphragms respectively in operation of the pump.
  • a bush extending over the full axial length of the aperture in the partition member may be used instead of rings 23 if desired.
  • the partition member has formed in it two bifurcated passages 25, 26 serving respectively as inlets and outlets respectively for the pumped fluid, and each of the branches of each passage incorporates a non-return valve.
  • the two branches of the inlet passage are shown at 25a and 25b and extend from a common inlet at the outer periphery of the partition member 14 to the two pumping chambers 20 respectively.
  • Each of the branches has mounted in it a valve seating element 28 and a captive ball 29 together constituting the non-return valve.
  • the two branches 26a, 26b of the outlet passage extend from the respective pumping chambers 20 to a common outlet at the periphery of the partition member, and each branch incorporates a valve seating element 28 and a captive ball 29 constituting the non-return valve.
  • the partition member 14 is made in one piece from a plastics material such as PTFE and each seating element 28 is pressed into place through achordal aperture 28a in the member 14 and comprises a portion 28b which blanks off the aperture 28a and a portion 28c which provides a seat for the captive ball 29.
  • the inner face of portion 28b has an arch-like projecting rib 28d the limbs of which serve with the opposite wall of the passage to guide the ball for rectilinear movement.
  • the partition member is made in two halves which are clamped together axially between end covers and valve seating rings are located in grooves on the axially inner surfaces of the two halves.
  • the partition member is located with the common inlet and the common outlet in circumferential alignment with radial apertures in the diaphragm ring 13 by twoaxial pins 13a, and a liner in the form of a hollow bolt 30 extends through each of these apertures and an aligned aperture in the support ring 10, the head of the bolt-being countersunk in the diaphragm ring 13 and the shank of the bolt being in screw-threaded engagement in the aperture in the support ring.
  • a jointing boss extends about the outer end of each of these apertures in the support ring 10.
  • An air-supply/exhaust passage 40 shown in Figure 3A is formed in each end cover 11, 12 through which compressed air is admitted to and exhausted from the associated motor chamber 19 by way of a servo valve 39.
  • each end cover In the outer end of a bore extending centrally through each end cover is secured a pilot valve unit 33 which is screw-threaded into the end cover and which carries a pilot valve member 34 loaded lightly into sealing engagement with a valve seat 35 by a compression spring 36.
  • An intermediate enlarged portion of the bore forms a chamber 38 about the unit and each of the chambers communicates through a passage 41 with an associated pilot chamber 37 of a pneumatic servo changeover valve 39.
  • This valve (see Figure 3A) is of the kind comprising a valve body 42 having a bore in which a valve spool 44 is slidably mounted.
  • the chambers 37 at opposite ends of the spool are in permanently open but restricted communication with a source of compressed air through passages 45,
  • Electric solenoid devices may be provided which control movements of the spool valve member in both directions independently, similarly electric solenoid devices may be provided which control movements of the spool valve in both directions independently and which are also capable of moving the spool valve member into either of its end positions from a central position into which it is urged by centralising springs provided in the end chambers; in this case, the valve ports and lands are arranged so that both motor chambers 19 are connected to exhaust when the spool valve member is in its central position.
  • the ends of the push rod 22 are flat but may be suitably domed and profiled to avoid pressing sharp edges against the diaphragms whatever the attitude of the latter.
  • the diaphragms themselves may be made from any suitable materials, including PTFE, rubber, neoprene, viton and PTFE-faced rubber, and may be reinforced locally or across the full face of the diaphragm if required.
  • the diaphragms may be of the tandem or double-skin type with a liquid held captive between the two skins to transmit the pressures from one skin to the other, and a device responsive to the pressure of the liquid and/or to a change in the composition of the liquid may be provided to indicate rupture of one of the skins.
  • the diaphragms 16, 17 are secured to the ends of the push rod 22.
  • the partition member and the bolts 30 may be made from stainless steel, plastics, glass, wood or any material suitably resistant to corrosive properties of the fluid to be pumped, and it will be apparent that the diaphragms 16, 17 prevent leakage of the pumped fluid between the partition member 14 and the bolts 30, so that these five components jointly confine the pumped fluid during the whole of its passage through the pump.
  • Flap valves may be employed in place of the ball valves and may advantageously be arranged so as to enable the pumped fluid to enter by the top passage 26 and be delivered through the bottom passage 25.
  • a major advantage of the illustrated pump is that it enables dangerous or unpleasantr fluids to be pumped with relative safety in that the partition member 14 can be made of plastics, glass or wood or any other material which in itself is relatively fragile but which is appropriately resistant to the effects of the fluid, because the partition member is protected by the support ring and the end covers against accicental damage.
  • the partition member 14 can be made of plastics, glass or wood or any other material which in itself is relatively fragile but which is appropriately resistant to the effects of the fluid, because the partition member is protected by the support ring and the end covers against accicental damage.
  • the pumping chambers are at opposite ends of the pump and the air chambers are adjacent each other, and a pneumatic switching mechanism is disposed between the diaphragm and is consequently difficult of access, but in the illustrated pump the pneumatic switching mechanism can be conveniently mounted on the casing to be readily accessible and removable for servicing.
  • the air chambers are at the ends of the pump, the rod 22 extending between the diaphragm is never in tension so that it is in many cases unnecessary to connect the rod to the diaphragms.
  • the diaphragms can be unperforated and the simple abutment contact between the rod and the diaphragm allows the latter to find their natural position during pumping.
  • the length of the working stroke can be adjusted by altering the length of the pilot valve member 38 projecting into the cylinder.
  • the guide or rings may be omitted and the push rod attached to the diaphragms, a small clearance being left round the push rod where it passes through the partition member.
  • the clearance is determined having regard to the viscosity of the pumped fluid such that there is no significant leakage between the two axially inner chambers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Driven Valves (AREA)
  • Saccharide Compounds (AREA)
EP84302390A 1983-04-07 1984-04-06 Pompe à membrane ou à piston Expired EP0132913B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84302390T ATE31966T1 (de) 1983-04-07 1984-04-06 Membran- oder kolbenpumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8309426 1983-04-07
GB838309426A GB8309426D0 (en) 1983-04-07 1983-04-07 Pumps

Publications (2)

Publication Number Publication Date
EP0132913A1 true EP0132913A1 (fr) 1985-02-13
EP0132913B1 EP0132913B1 (fr) 1988-01-13

Family

ID=10540757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84302390A Expired EP0132913B1 (fr) 1983-04-07 1984-04-06 Pompe à membrane ou à piston

Country Status (4)

Country Link
EP (1) EP0132913B1 (fr)
AT (1) ATE31966T1 (fr)
DE (1) DE3468727D1 (fr)
GB (1) GB8309426D0 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298615A2 (fr) * 1987-06-11 1989-01-11 Flotronic Controls Limited Double pompe à membrane
US4927335A (en) * 1987-11-04 1990-05-22 O.D.L. S.R.L. Pump for transferring liquids, in particular beer or carbonated beverages
US5053941A (en) * 1986-08-29 1991-10-01 Sun Microsystems, Inc. Asynchronous micro-machine/interface
GB2291470A (en) * 1994-07-18 1996-01-24 Outboard Marine Corp Fuel injected two-stroke engine fuel system
WO1996034201A1 (fr) * 1995-04-27 1996-10-31 Svante Bahrton Pompe a double effet
WO1996034202A1 (fr) * 1995-04-27 1996-10-31 Svante Bahrton Pompe a double effet
WO1999025999A1 (fr) * 1997-11-13 1999-05-27 Svante Bahrton Agencement de soupape
GB2357811A (en) * 1999-12-30 2001-07-04 Flotronic Pumps Ltd Double-diaphragm pump
WO2010125328A1 (fr) * 2009-04-29 2010-11-04 Flotronic Pumps Limited Pompes à double membrane
WO2011144772A1 (fr) 2010-05-18 2011-11-24 Samoa Industrial, S.A. Pompe à double membrane à flux central
CN107013442A (zh) * 2016-03-02 2017-08-04 上海方顿工业设备有限公司 一种外置气控阀的气动隔膜泵
US10477883B2 (en) 2015-08-25 2019-11-19 Cornelius, Inc. Gas injection assemblies for batch beverages having spargers
US10785996B2 (en) 2015-08-25 2020-09-29 Cornelius, Inc. Apparatuses, systems, and methods for inline injection of gases into liquids
US11040314B2 (en) 2019-01-08 2021-06-22 Marmon Foodservice Technologies, Inc. Apparatuses, systems, and methods for injecting gasses into beverages

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1920014A (en) * 1931-06-26 1933-07-25 Trico Products Corp Multiple diaphragm pump
GB481270A (en) * 1936-10-07 1938-03-08 Ettore Caretta Improved diaphragm pump with direct actuation by fluid
US2260306A (en) * 1938-04-16 1941-10-28 Sullivan Machinery Co Pump
GB837737A (en) * 1957-12-06 1960-06-15 Wm Butler & Co Bristol Ltd Improvements relating to hydraulically operated pumps
GB2085979A (en) * 1980-09-29 1982-05-06 Mccann Eng & Mfg Fluid powered reciprocating pumps
US4334837A (en) * 1979-01-19 1982-06-15 Aisin Seiki Kabushiki Kaisha Diaphragm air pump assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1920014A (en) * 1931-06-26 1933-07-25 Trico Products Corp Multiple diaphragm pump
GB481270A (en) * 1936-10-07 1938-03-08 Ettore Caretta Improved diaphragm pump with direct actuation by fluid
US2260306A (en) * 1938-04-16 1941-10-28 Sullivan Machinery Co Pump
GB837737A (en) * 1957-12-06 1960-06-15 Wm Butler & Co Bristol Ltd Improvements relating to hydraulically operated pumps
US4334837A (en) * 1979-01-19 1982-06-15 Aisin Seiki Kabushiki Kaisha Diaphragm air pump assembly
GB2085979A (en) * 1980-09-29 1982-05-06 Mccann Eng & Mfg Fluid powered reciprocating pumps

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5053941A (en) * 1986-08-29 1991-10-01 Sun Microsystems, Inc. Asynchronous micro-machine/interface
EP0298615A3 (fr) * 1987-06-11 1989-11-15 Flotronic Controls Limited Double pompe à membrane
EP0298615A2 (fr) * 1987-06-11 1989-01-11 Flotronic Controls Limited Double pompe à membrane
US4927335A (en) * 1987-11-04 1990-05-22 O.D.L. S.R.L. Pump for transferring liquids, in particular beer or carbonated beverages
GB2291470A (en) * 1994-07-18 1996-01-24 Outboard Marine Corp Fuel injected two-stroke engine fuel system
US6299415B1 (en) 1995-04-27 2001-10-09 Svante Bahrton Double-acting pump
WO1996034201A1 (fr) * 1995-04-27 1996-10-31 Svante Bahrton Pompe a double effet
WO1996034202A1 (fr) * 1995-04-27 1996-10-31 Svante Bahrton Pompe a double effet
US6422834B1 (en) 1997-11-13 2002-07-23 Svante Bahrton Reversing valve for a diaphragm pump
AU734911B2 (en) * 1997-11-13 2001-06-28 Svante Bahrton A valve arrangement
WO1999025998A1 (fr) * 1997-11-13 1999-05-27 Svante Bahrton Agencement de soupape
AU740929B2 (en) * 1997-11-13 2001-11-15 Svante Bahrton A valve arrangement
US6419463B1 (en) 1997-11-13 2002-07-16 Svante Bahrton Reversing valve for a diaphragm pump
WO1999025999A1 (fr) * 1997-11-13 1999-05-27 Svante Bahrton Agencement de soupape
GB2357811A (en) * 1999-12-30 2001-07-04 Flotronic Pumps Ltd Double-diaphragm pump
EP1113174A2 (fr) 1999-12-30 2001-07-04 Flotronic Pumps Limited Pompe à membrane double
EP1113174A3 (fr) * 1999-12-30 2002-01-02 Flotronic Pumps Limited Pompe à membrane double
WO2010125328A1 (fr) * 2009-04-29 2010-11-04 Flotronic Pumps Limited Pompes à double membrane
GB2470348A (en) * 2009-04-29 2010-11-24 Flotronic Pumps Ltd Double diaphragm pump with unidirectional valve arrangement
GB2470348B (en) * 2009-04-29 2011-06-08 Flotronic Pumps Ltd Double-diaphragm pump with unidirectional valve arrangement
US8469681B2 (en) 2009-04-29 2013-06-25 Flotronic Pumps Limited Double-diaphragm pumps
ES2380260A1 (es) * 2010-05-18 2012-05-10 Samoa Industrial S.A. Bomba de doble membrana de flujo central.
CN103140679A (zh) * 2010-05-18 2013-06-05 萨摩亚工业股份公司 中央流双隔膜泵
WO2011144772A1 (fr) 2010-05-18 2011-11-24 Samoa Industrial, S.A. Pompe à double membrane à flux central
KR20130111224A (ko) * 2010-05-18 2013-10-10 사모아 인더스트리얼 에스.에이. 중앙 유동 이중 다이어프램 펌프
US8858195B2 (en) 2010-05-18 2014-10-14 Samoa Industrial S.A. Double-membrane central-flow pump
CN103140679B (zh) * 2010-05-18 2015-11-25 萨摩亚工业股份公司 中央流双隔膜泵
EP2573397A4 (fr) * 2010-05-18 2017-10-18 Samoa Industrial S.A. Pompe à double membrane à flux central
US10477883B2 (en) 2015-08-25 2019-11-19 Cornelius, Inc. Gas injection assemblies for batch beverages having spargers
US10785996B2 (en) 2015-08-25 2020-09-29 Cornelius, Inc. Apparatuses, systems, and methods for inline injection of gases into liquids
US11013247B2 (en) 2015-08-25 2021-05-25 Marmon Foodservice Technologies, Inc. Apparatuses, systems, and methods for inline injection of gases into liquids
CN107013442A (zh) * 2016-03-02 2017-08-04 上海方顿工业设备有限公司 一种外置气控阀的气动隔膜泵
US11040314B2 (en) 2019-01-08 2021-06-22 Marmon Foodservice Technologies, Inc. Apparatuses, systems, and methods for injecting gasses into beverages

Also Published As

Publication number Publication date
DE3468727D1 (en) 1988-02-18
GB8309426D0 (en) 1983-05-11
EP0132913B1 (fr) 1988-01-13
ATE31966T1 (de) 1988-01-15

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