EP0599738A1 - Fluiddichte Kolbenpumpe - Google Patents

Fluiddichte Kolbenpumpe Download PDF

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Publication number
EP0599738A1
EP0599738A1 EP93402871A EP93402871A EP0599738A1 EP 0599738 A1 EP0599738 A1 EP 0599738A1 EP 93402871 A EP93402871 A EP 93402871A EP 93402871 A EP93402871 A EP 93402871A EP 0599738 A1 EP0599738 A1 EP 0599738A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump body
face
pump
ring
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
EP93402871A
Other languages
English (en)
French (fr)
Other versions
EP0599738B1 (de
Inventor
Karim Cabinet Ballot-Schmit Benalikhodja
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.)
Markem Imaje SAS
Original Assignee
Imaje SA
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 Imaje SA filed Critical Imaje SA
Publication of EP0599738A1 publication Critical patent/EP0599738A1/de
Application granted granted Critical
Publication of EP0599738B1 publication Critical patent/EP0599738B1/de
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
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0466—Nickel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a sealed piston pump, in which the fluid to be conveyed is drawn in and discharged into a chamber with variable volume under the effect of the reciprocating movement of a piston in this chamber and for which the seal between the the pump and another room must be provided.
  • This seal must be compatible with the movement of the pump members such as the piston and must be preserved despite possible chemical attacks due for example to the chemical nature of the fluid under certain temperature and pressure conditions.
  • the piston pump with membranes described in US Pat. No. 4,357,617 to Sharp KK has a large number of stacked parts necessary for producing the assembly comprising the pump body, the piston and its sealing means and fluid connections.
  • This solution is expensive and unreliable because of its constitution: in fact, the membranes are wedged between two successive elements of the piston on the one hand and two flanges on the pump body on the other, which can cause them to rupture during binding operations.
  • patents FR 71 03002, DE 1 231 584, FR 1 432 594 describe systems for supporting membranes in piston devices, such as concentric rings bearing against the membrane on one side and against the 'mobile control member on the other, sliding into each other. They are also ribs, integral with the piston, on which rests on the membrane. These systems are complicated to assemble and unsuitable for application to inkjet printers.
  • the drawback of using waterproofing membranes available on the market is related to their method of manufacture, generally by cutting a regular chip on the periphery of a cylinder, which leaves traces of tool on the membrane as well. performed, favoring rupture zones.
  • current piston pumps usually include a metal piston, the walls of which run in contact with the pump body, generating filings which may wear or clog certain parts of the hydraulic circuit in which the pump is integrated.
  • the object of the invention is to overcome these drawbacks by proposing a sealed piston pump of simple design while guaranteeing an optimal compression rate for the pump, whatever the phase of the fluid conveyed, liquid - ink for example - , gas or two-phase.
  • the invention provides a one-piece piston-membrane-flange assembly molded in a single piece of synthetic material.
  • the one-piece assembly can be produced by sintering fine powders giving a homogeneous material making it possible to obtain an assembly of very good quality and reduced cost when it is produced in large series.
  • the piston-diaphragm-flange monobloc assembly is made of polyethylene tetrafluoride, thus avoiding the problems of running in of the piston since its shaping in the pump body is essentially by caulking.
  • the sealed piston pump according to the invention as shown in FIG. 1, comprises a pump body 2 at the center of one of the faces 27 from which an open cavity 1 is hollowed out, intended to receive a cylindrical piston, of dimensions substantially equal to those of the cavity 1. At least two holes 12 are drilled in the pump body, outside the cavity 1.
  • the pump also comprises a cylindrical piston 6, which is an integral part of a monobloc assembly 7 of circular shape which also comprises a ring 4 intended to be placed on the face 27 of the pump body 2 and a thinned deformable part 5, connecting the upper periphery 64 of the central piston 6 at the inner circumference of the ring 4.
  • the said piston is housed in the cavity 1 of the pump body 2.
  • This monobloc assembly 7 is made of flexible synthetic material, resistant to chemical agents and to friction , such as polyethylene tetrafluoride. The different parts of the assembly are obtained by machining or by molding thermocompressed powders.
  • the cylindrical piston 6 is pierced with a central hole in which is integrally housed a rod 3, which must be coupled to a member, not shown in the figure, for driving the piston according to an alternating movement back and forth according to the longitudinal axis 9 of said piston, with an authorized angular incidence.
  • This displacement of the piston between an extreme low position defined by the bottom of the cavity and an extreme high position, delimits a variable volume chamber 20, comprised between the bottom of the cavity 1 and the base of the piston 6.
  • FIG. 1 represents the pump according to the invention, the piston being in the low position for which the volume of the chamber is minimal and FIG. 2 represents it while the piston is in the high position for which the volume is maximum.
  • a shoulder 18 on the periphery of the base of the rod 3, facing the pump body 2 enables said rod to be secured to the piston 6, by means of a tightening nut 17.
  • the rod 3 can be made of the same material as the one-piece assembly 7, in which case it is simply a projection of the piston 6, outside the cavity 1 of the pump body 2.
  • the ring 4 is hollowed out, on its face 40 opposite the pump body 2, an annular channel 10, the bottom of which is drilled at the tapped holes 12 of the pump body, to allow the passage of fixing means, such as screw 11 for example.
  • An annular reinforcement flange 13 can be placed in the annular channel 10. This flange, which allows the tightening forces of the screws 11 to be distributed uniformly around the periphery of the ring 4, is above all made necessary by the plasticity of the polytetrafluoride.
  • ethylene it can be dispensed with when the one-piece assembly 7 is made of metal, for example steel or electrodeposited nickel.
  • the thinned part 5, which connects the upper periphery 64 of the piston 6 to the inner circumference of the ring 4, is flexible and deformable and its initial shape, when the piston is in the low position, perfectly matches the neck 22 of the cavity 1, slightly rounded in the figures. Its advantage comes from its deformation capacity to follow the movement of the piston 6 while the ring 4 remains integral with the pump body 2.
  • the thinned part minimizes the dead volume of the chamber 20 , thereby increasing the compression ratio of the pump.
  • part 5, which acts as the membrane of a conventional pump deforms but works essentially in bending and almost not in traction, which increases its service life .
  • variable volume chamber 20 can be ensured by a joint paste deposited between the facing faces of the pump body 2 and the monobloc assembly 7, or by a peripheral thread of the ring 4 provided with a oil seal.
  • the seal is ensured by two concentric circular ribs 14 and 15 which are arranged around the cavity 1 on the face 27 of the pump body 2 and which can be produced in two modes. .
  • said ribs are hollowed out in the pump body 2, under the ring 4 and at the level of the reinforcement flange 13.
  • An O-ring placed in each of these ribs seals the variable-volume chamber delimited by the cavity 1 of the pump body 2, the piston 6 and the thinned part 5 of the monobloc assembly 7.
  • said ribs are produced in relief on the face 27 of the pump body 2 or on the face 40 of the ring 4 facing the pump body, at the level of the flange 13.
  • the ribs 14 and 15 come to bite either the face 27 of the pump body or the face 40 of the ring 4 by very strong contact and allow the same chamber to be sealed with variable volume.
  • a second variable volume chamber 30 by placing on the monobloc assembly 7 a circular disk 16 of the same diameter as the assembly 7 and pierced in its center for the passage of the rod 3
  • This second chamber 30 is created between the one-piece assembly 7 and the disk 16.
  • the face 160 of this disk 16 opposite the assembly 7 has a shape complementary to that of said assembly 7 , that is to say that it comprises a central part producing a second piston 60 coaxial with the first, whose rounded neck 23 in contact with the thinned part 5 has a profile capable of permanently supporting the top of the convexity of said part 5 during the displacement of the piston 6.
  • the part 5 participates in the work of compression of the fluid to ensure its flow along the generatrices of the cylinders forming the piston 6 and the apex of the convexity of the part 5 is then anytime the most part fragile, because it is subjected simultaneously to a bending force and to the force of the pressure differential between its face opposite the piston 6 and that facing the piston 60.
  • Most of the compression work is carried out by the base of the piston 6.
  • the shape of the disc 16 thus defined has the additional advantage of perfectly matching the thinned part 5 when the piston 6, therefore the disc 16, are in the low position, thus reducing the dead volume in compression of the second chamber with variable volume 20.
  • the sealing of the second chamber 30 is conventionally ensured by a membrane 21 fixed to the disk 16 on the one hand and to the pump body 2 on the other hand, by a flange 210 for example.
  • a plate 201 is placed on the membrane 21 to ensure good mechanical strength of the assembly.
  • Each of the variable volume chambers 20 and 30 communicates with the fluid circuit for which the pump according to the invention is intended by means of valves housed in cavities C26 shown in FIG. 5 which will be described later.
  • the thinned part 5 of the monobloc assembly 7 comprises at least two folds 50 between the periphery 64 of the piston 6 and the ring 4, concentric to the axis 9 of the piston 6.
  • the part 5 is deformed by winding material.
  • the advantage offered by these folds 50 parallel to the axis 9 of the piston and therefore to the axis of its displacement lies in the tolerance of angular variations in the displacement of the piston, due to the great flexibility of the part 5 thus pleated.
  • the face 27 of the pump body is provided with bosses 25, in a number equal to that of the pleats 50, and of an adequate shape to fit fully into the plies in order to minimize the dead volume in compression when the piston is in the low position, a dead volume not participating in the compression of the fluid by the pump because it does not cause displacement of the piston.
  • bosses 25 support and guide the thinned part 5 during the displacement of the piston, during the operation of the pump.
  • the pump needs to include two variable volume chambers, it further comprises a disc 61 placed on the one-piece assembly 7 and the opposite face of the latter is flat, therefore easily achievable.
  • This type of pump according to the invention is particularly well suited for conveying multiphase fluids between different reservoirs by precisely controlling their pressures, in particular in ink supply circuits for inkjet printers such as that shown in the figure. 5.
  • This figure is a perspective view in longitudinal section of the pump according to the invention, integrated in a supply circuit of an ink jet print head, as described in French patent 2,624 795, filed in the name of the plaintiff.
  • the sealed pump according to the invention is located in the lower part of a device intended to receive a combination of two variable volume chambers and cooperates with a reservoir block 300. It is placed in a device 100 consisting of a solid monolithic block in which we find the following cavities.
  • a pipe C p connects a pressure sensor P with the variable volume chamber 20.
  • a flange holds this sensor P in place and includes profiles 140 serving as supports for the electromagnetic valves intended to be housed in the cavities C 26a .
  • a set of screws passing through holes t i holds the ring 4 and the flange 210 which respectively pinch the thinned part 5 and the membrane 21.
  • the piston 6 is connected via the base 600 to a connecting rod 500 connected by by means of an eccentric 301 supported by a bearing 181 to a motor carried by a motor support 171.
  • the monobloc tank block 300 is disposed between the motor block 170 and the pump, and has two compartments which perform the function of tanks ink recovery 71 and accumulation 81, and a passage 167 through which the connecting rod 500.
  • cartridge holders 157 On the sides of the pump are disposed cartridge holders 157, receiving the ink and solvent cartridges necessary for the operation of printer and are removable. The ink is taken at the level of a trocar 90 whose function is to penetrate a membrane provided for this purpose in the cartridge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP93402871A 1992-11-27 1993-11-26 Fluiddichte Kolbenpumpe Expired - Lifetime EP0599738B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214333 1992-11-27
FR9214333A FR2698665B1 (fr) 1992-11-27 1992-11-27 Pompe étanche à piston.

Publications (2)

Publication Number Publication Date
EP0599738A1 true EP0599738A1 (de) 1994-06-01
EP0599738B1 EP0599738B1 (de) 1996-03-20

Family

ID=9436000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402871A Expired - Lifetime EP0599738B1 (de) 1992-11-27 1993-11-26 Fluiddichte Kolbenpumpe

Country Status (5)

Country Link
US (1) US5468128A (de)
EP (1) EP0599738B1 (de)
JP (1) JPH06213146A (de)
DE (1) DE69301902T2 (de)
FR (1) FR2698665B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724080A (en) * 1993-12-20 1998-03-03 Canon Kabushiki Kaisha Non-sticking pump for use in recovery of ink jet recording apparatus
US6079959A (en) * 1996-07-15 2000-06-27 Saint-Gobain Performance Plastics Corporation Reciprocating pump
FR2780476B1 (fr) * 1998-06-30 2000-09-15 Peugeot Dispositif de transmission d'un volume de fluide sous pression et membrane pour un tel dispositif
US7335003B2 (en) * 2004-07-09 2008-02-26 Saint-Gobain Performance Plastics Corporation Precision dispense pump
JP4770424B2 (ja) * 2005-11-24 2011-09-14 株式会社豊田自動織機 ダイヤフラム型ポンプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR823680A (fr) * 1936-07-01 1938-01-25 Perfectionnements aux pompes à diaphragme
US2241056A (en) * 1937-11-30 1941-05-06 Wright Aeronautical Corp Hydraulic diaphragm
US2675758A (en) * 1949-01-06 1954-04-20 Infilco Inc Chemical feeder
US2928426A (en) * 1952-06-27 1960-03-15 Malsbary Mfg Company Diaphragm for pump
US3092032A (en) * 1960-12-21 1963-06-04 Prec Chemical Pump Corp Pump
FR1412473A (fr) * 1964-07-31 1965-10-01 Pompe
DE3813500A1 (de) * 1988-04-22 1989-11-02 Alkor Gmbh Membranpumpe oder membrankompressor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856047A (en) * 1952-02-07 1958-10-14 Dodge Mfg Corp Fluid pressure operated clutch
DE1231584B (de) * 1961-11-04 1966-12-29 Westinghouse Bremsen Apparate Bremskraftregler fuer Fahrzeuge, insbesondere Kraftfahrzeuge
FR1432594A (fr) * 1964-12-30 1966-03-25 Dispositif de soutien total et, éventuellement, d'asservissement d'une membrane
DE2004227B2 (de) * 1970-01-30 1973-05-24 Knorr Bremse GmbH, 8000 München Membrankolben
US4495947A (en) * 1982-09-23 1985-01-29 Imasco-Cdc Research Foundation High speed medical ventilator
GB8708417D0 (en) * 1987-04-08 1987-05-13 Eaton Sa Monaco Electric pump
FR2624795B1 (fr) * 1987-12-21 1990-04-13 Imaje Sa Dispositif destine a recevoir une combinaison de deux chambres a volume variable et d'une pluralite de valves pour circuit d'alimentation d'une tete d'impression a jet d'encre

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR823680A (fr) * 1936-07-01 1938-01-25 Perfectionnements aux pompes à diaphragme
US2241056A (en) * 1937-11-30 1941-05-06 Wright Aeronautical Corp Hydraulic diaphragm
US2675758A (en) * 1949-01-06 1954-04-20 Infilco Inc Chemical feeder
US2928426A (en) * 1952-06-27 1960-03-15 Malsbary Mfg Company Diaphragm for pump
US3092032A (en) * 1960-12-21 1963-06-04 Prec Chemical Pump Corp Pump
FR1412473A (fr) * 1964-07-31 1965-10-01 Pompe
DE3813500A1 (de) * 1988-04-22 1989-11-02 Alkor Gmbh Membranpumpe oder membrankompressor

Also Published As

Publication number Publication date
DE69301902T2 (de) 1996-09-26
EP0599738B1 (de) 1996-03-20
FR2698665B1 (fr) 1995-02-17
FR2698665A1 (fr) 1994-06-03
US5468128A (en) 1995-11-21
DE69301902D1 (de) 1996-04-25
JPH06213146A (ja) 1994-08-02

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