EP0569262A1 - Volumetrische Pumpe - Google Patents

Volumetrische Pumpe Download PDF

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Publication number
EP0569262A1
EP0569262A1 EP93400864A EP93400864A EP0569262A1 EP 0569262 A1 EP0569262 A1 EP 0569262A1 EP 93400864 A EP93400864 A EP 93400864A EP 93400864 A EP93400864 A EP 93400864A EP 0569262 A1 EP0569262 A1 EP 0569262A1
Authority
EP
European Patent Office
Prior art keywords
piston
pumping
orifice
operating rod
closing
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
EP93400864A
Other languages
English (en)
French (fr)
Other versions
EP0569262B1 (de
Inventor
André Graffin
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.)
Societe dEtude et Realisation dApplications Composites SA SERAC
Original Assignee
Societe dEtude et Realisation dApplications Composites SA SERAC
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 Societe dEtude et Realisation dApplications Composites SA SERAC filed Critical Societe dEtude et Realisation dApplications Composites SA SERAC
Publication of EP0569262A1 publication Critical patent/EP0569262A1/de
Application granted granted Critical
Publication of EP0569262B1 publication Critical patent/EP0569262B1/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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston

Definitions

  • the present invention relates to a positive displacement pump intended in particular to equip a machine for metering a heterogeneous liquid or viscous product.
  • Numerous positive displacement pumps are known in which the product to be dosed is in contact with one of the sides of a piston mounted mobile in a cylindrical pumping chamber, the pump being equipped at one end with an opening which is alternately connected to a pipe. supply and a distribution pipe, or an intake opening and a distribution opening which are alternately open and closed.
  • the second side of the piston is in contact with the ambient environment and the risks of contamination of the product handled are significant.
  • Volumetric pumps are also known comprising an inlet opening at one end of the pumping chamber and a dispensing opening at an opposite end, the piston then being traversed by a pumping opening which is alternately open and closed by means of a non-return valve.
  • the product to be packaged is then in contact with the two faces of the piston so that the risks of contamination only appear at the level of the piston operating rod and are relatively easy to resolve.
  • a non-return valve which is not accessible without dismantling the pump makes cleaning and sterilization operations of the pump complex.
  • the pump can only operate for liquids without particles and without pieces because these would block the valve in the open position.
  • An object of the invention is to provide a positive displacement pump having a low risk of contamination of the packaged product and which can be easily cleaned and sterilized.
  • a positive displacement pump comprising a housing delimiting a cylindrical pumping chamber having a longitudinal axis and comprising a supply orifice and a distribution orifice at opposite ends, a piston pierced with a pumping orifice and associated with an operating rod for sliding in an alternating movement in the pumping chamber between the supply orifice and the dispensing orifice, and a device for closing the pumping orifice , in which the device for closing the pumping opening comprises a closing member mounted to pivot about an axis adjacent to the pumping opening and comprising a substantially planar closing surface facing the piston, and a maneuver connected to the closure member and extending outside the housing to ensure pivoting of the closure member between a position where the closure face of the closure member is applied to the pumping orifice and covers it in leaktight fashion, and a position where the closing face is released from the pumping orifice.
  • the pumping orifice is alternately open and closed by acting on the operating member of the closing member so that the product is packaged while benefiting from the advantages of contact of the product with the two faces of the piston and, for cleaning, the pumping orifice is kept open so that cleaning and sterilization liquid can be sent with a high flow rate through the pump to ensure complete cleaning of the latter without any disassembly.
  • the piston operating rod is mounted to pivot around a pivot axis parallel to the longitudinal axis of the pumping chamber, and the closing member and the operating member of the closing device of the pumping orifice are fixed in rotation to the piston operating rod.
  • the piston operating rod not only serves to control the alternating movements of the piston in the pumping chamber by a sliding movement in the longitudinal direction of the operating rod, but also to operate the closing member by a pivoting of the piston operating rod around its longitudinal axis.
  • the piston operating rod is eccentric relative to the piston.
  • the rotation of the piston is prevented from rotating on itself without it being necessary to provide a particular member for this purpose.
  • the piston operating rod is mounted to slide axially on a pivoting lug, and the closure member is rigidly fixed to the operating rod and is kept applied to the piston by a elastic support member supported by the piston.
  • the elastic member has a stop and the closure member has a cavity having a sufficient depth to allow movement of the piston relative to the closure member in an axial direction of the operating rod when the cavity the closure member is opposite the elastic support member.
  • closure member is normally applied in a sealed manner to the surface facing the piston, but when the cavity of the closure member is opposite the elastic support member, the latter abuts and the axial movement to which the piston can be subjected relative to the closing member then makes it possible to space the closing member of the piston and to ensure a cleaning and sterilization of the closure member on all of its faces.
  • the positive displacement pump comprises a housing 1 delimiting a cylindrical pumping chamber 2 having a longitudinal axis 3 and comprising a supply orifice 4 and a distribution orifice 5 at opposite ends.
  • a piston 6 pierced with a pumping orifice 7 is arranged to slide in an alternating movement in the pumping chamber 2 between the supply orifice 4 and the dispensing orifice 5.
  • the position of the piston 6 is controlled by an operating rod 8, the lower end of which is mounted to pivot on a pivoting pin 9 fixed on the upper face of the piston 6 eccentrically with respect thereto.
  • a closing member 10, in the form of a pallet in the illustrated embodiment, is integral with the rod operation 8.
  • the closure member 10 comprises a substantially planar lower closure face 11 facing the piston 6 and kept applied against the upper face of the piston 6 by a support member 12 in the form of a stud comprising a flange so biased elastic by a spring 13 to bear on the closure member 10.
  • the support member 12 is carried by a bracket 14 fixed to the piston 6.
  • the closure member 10 has on its face opposite the support member 12, a cavity 15, here a groove whose bottom forms an inclined ramp towards the edge of the closure member 10, which comes opposite the support member 12 when the closure 10 is pivoted according to a movement which will be explained in more detail below.
  • the operating rod 8 passes through the housing 1 passing through a guide ring 16.
  • the guide ring 16 comprises, as illustrated in FIG. 1 , seals 17 delimiting an annular chamber 18 swept by steam or sterile water sent into the annular chamber 18 by supply and discharge conduits 19.
  • the operating rod 18 comprises a grooved part 20 on which is engaged an operating member 21 comprising complementary grooves for driving the operating rod 8 according to a pivoting around the pivoting pin 9 when the member 21 is moved by a control member such as a pneumatic cylinder (not shown).
  • a control member such as a pneumatic cylinder (not shown).
  • the operating rod 8 is associated with a control member (not shown) such as a pneumatic cylinder to move it along its longitudinal axis in an alternating movement intended to move the piston 6 alternately in the cylindrical pumping chamber 2.
  • the operation of the pump according to the invention is as follows: the piston 6 having been brought into the high position as illustrated in FIG. 1 by an appropriate longitudinal displacement of the operating rod 8, the operating member 21 is controlled so that the closing member 10 comes to cover the pumping orifice 7 as illustrated in solid lines in FIG. 2.
  • the operating rod 8 is then controlled to lower the piston 6 so that the product to be conditioned is sucked up by the supply orifice 4 until the piston 6 is in the low position illustrated in thin dashed line in FIG. 1.
  • the operating member 21 is then controlled to pivot the closing member 10 as illustrated in line mixed end in FIG. 2 so as to release the pumping orifice 7.
  • the operating rod 8 is controlled to raise the piston 6 and the product to be conditioned passes through the pumping orifice 7 to come below the piston 6 of so that at the stroke of the pump according to a determined quantity of product corresponding to the volume swept by the piston is pushed through the dispensing orifice 5.
  • the pump is operated several times at start-up to fill the lower part of the housing 1 and the distribution pipe not shown.
  • usual means such as controlled valves are provided on the supply and distribution lines of the pump to avoid displacement of the product to be packaged in the opposite direction to that desired.
  • the piston 6 When it is desired to clean, and if necessary sterilize the pump, the piston 6 is brought into an extreme lower position in a part 23 of the housing 1 having a diameter greater than the diameter of the piston 6. This position is illustrated in FIG. 3. Simultaneously, the closure member 10 is pivoted until the cavity 15 of the closure member 10 is opposite the support member 12 as illustrated in FIG. 4. The support member 12 come then in contact with a stop 24 formed by the lower wing of the bracket 14 so that the distance between the lower end of the support member and the upper face of the piston is greater than the thickness of the piston at the level from the cavity 15. Cleaning and sterilization product is sent through the inlet port 4 and flows through the pumping port 7 and all around the piston 6.
  • the pressure of the cleaning liquid also ensures downward offset of the piston 6 relative to the closure member 10 until the lower end of the support member 12 is in contact with the bottom of the groove 15 as illustrated in FIG. 3.
  • the lower face 11 of the closure member 10 is then spaced from the upper face of the piston 6, which allows the passage of the cleaning product between the closure member 10 and the upper face of the piston 6.
  • the pump is located thus completely subject to the flow of cleaning liquid if it is necessary to disassemble.
  • FIG. 5 illustrates an alternative embodiment in which the operating rod 8 comprises a shoulder 25 bearing on the upper end of a bushing 26 integral with the piston 6.
  • the closing member 10 is this time placed below the piston 6 and is driven by the operating rod 8 by means of a square section portion 27 on which the closure member 10 is held by a nut 28.
  • the closure member 10 does not is therefore not susceptible to axial movement relative to the piston 6 and to ensure proper cleaning of the closing face 11 of the closing member 10 opposite the piston 6, the piston 6 has an extra thickness zone 29 surrounding the pumping orifice and the pivot axis of the operating rod 8.
  • the closing member 10 ensures a tight closure from the orifice pumping 7.
  • Au on the contrary, when the closure member 10 is offset from the pumping orifice 7, it is simultaneously offset from the additional thickness 29 so that, during cleaning, cleaning product can circulate between the closure face 11 and the underside of piston 6.
  • the operating rod 8 of the piston 6 serves simultaneously to rotate the closing member 10, it is possible to produce a pump comprising a separate operating rod for the closing member 10 .
  • an oversized zone 29 is shown extending continuously between the pumping orifice 7 and the pivot axis of the operating rod 8. It is of course possible to provide two separate extra thickness zones forming a rim of the same thickness around the operating rod 8 and the pumping orifice 7 in order to minimize the friction of the closure member 10 on the face of the piston 6.
  • the pump according to the invention can be produced with a pumping chamber of non-circular section, for example oval or elliptical. In this case there is no longer any risk of turning the piston on itself around the longitudinal axis of the pumping chamber and the operating rod 8 can therefore be arranged along the axis of the pumping chamber. .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
EP93400864A 1992-04-07 1993-04-02 Volumetrische Pumpe Expired - Lifetime EP0569262B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204232 1992-04-07
FR9204232A FR2689570B1 (fr) 1992-04-07 1992-04-07 Pompe volumetrique.

Publications (2)

Publication Number Publication Date
EP0569262A1 true EP0569262A1 (de) 1993-11-10
EP0569262B1 EP0569262B1 (de) 1995-07-05

Family

ID=9428581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400864A Expired - Lifetime EP0569262B1 (de) 1992-04-07 1993-04-02 Volumetrische Pumpe

Country Status (6)

Country Link
US (1) US5292236A (de)
EP (1) EP0569262B1 (de)
BR (1) BR9300903A (de)
DE (1) DE69300240T2 (de)
ES (1) ES2075765T3 (de)
FR (1) FR2689570B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3388921B2 (ja) * 1994-11-29 2003-03-24 株式会社東芝 集積回路カードの製造方法
JPH08326655A (ja) * 1995-06-05 1996-12-10 Calsonic Corp 斜板式コンプレッサ
FR2817848B1 (fr) * 2000-12-12 2003-03-07 Rexam Sofab Micropompe electronique
US10859071B2 (en) * 2018-08-14 2020-12-08 Stinger Oil Tools Llc Rotary traveling valve
IT201800009425A1 (it) * 2018-10-12 2020-04-12 Romaco Srl Dispositivo e apparecchiatura per l’erogazione di quantità dosate di un materiale liquido

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093691A1 (de) * 1982-04-21 1983-11-09 Kurt Stauffer Kolbenpumpe für Flüssigkeiten
DE3541708A1 (de) * 1985-08-16 1987-05-27 Heinz Buechner Kolbenpumpe ohne ein- und auslassventile

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1322552A (en) * 1919-11-25 Francis j
US1419151A (en) * 1920-06-25 1922-06-13 Christian S Kurtz Pump
US2175000A (en) * 1937-06-23 1939-10-03 Schlesinger Sigmund Apparatus for the picking up of loops or meshes dropped in hosiery and knitted goods
US2231941A (en) * 1939-09-05 1941-02-18 Nels M Ohman Vacuum gold dredge
US3981635A (en) * 1973-09-14 1976-09-21 Hedlund Manufacturing Co., Inc. Material handling system
JPS5751973A (en) * 1980-09-11 1982-03-27 Okimoto Tamada Piston pump
US4878819A (en) * 1988-04-14 1989-11-07 Edward Bozoyan OTR safety urinal pumps

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093691A1 (de) * 1982-04-21 1983-11-09 Kurt Stauffer Kolbenpumpe für Flüssigkeiten
DE3541708A1 (de) * 1985-08-16 1987-05-27 Heinz Buechner Kolbenpumpe ohne ein- und auslassventile

Also Published As

Publication number Publication date
US5292236A (en) 1994-03-08
ES2075765T3 (es) 1995-10-01
DE69300240D1 (de) 1995-08-10
EP0569262B1 (de) 1995-07-05
FR2689570A1 (fr) 1993-10-08
FR2689570B1 (fr) 1994-05-27
BR9300903A (pt) 1993-10-13
DE69300240T2 (de) 1996-04-04

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