EP0103536A1 - Pompe à piston - Google Patents

Pompe à piston Download PDF

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Publication number
EP0103536A1
EP0103536A1 EP19830730085 EP83730085A EP0103536A1 EP 0103536 A1 EP0103536 A1 EP 0103536A1 EP 19830730085 EP19830730085 EP 19830730085 EP 83730085 A EP83730085 A EP 83730085A EP 0103536 A1 EP0103536 A1 EP 0103536A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump according
cylinder
piston pump
pump
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Withdrawn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
EP19830730085
Other languages
German (de)
English (en)
Inventor
Joachim Dr. Rer. Nat. Nagel
Lothar Heinze
Max Prof. Dr.-Ing. Schaldach
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0103536A1 publication Critical patent/EP0103536A1/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Withdrawn legal-status Critical Current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
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/003—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 free-piston type pumps
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/048—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing around the moving part of the motor

Definitions

  • the invention relates to a piston pump according to the preamble of claim 1.
  • Such a pump is known for example from DE-Al-27 41 348.
  • an intermediate serves Piston jacket surface and the cylinder in which the piston is mounted to move back and forth, part of the pumping medium located exclusively for the lubrication of the piston. Otherwise, the pump has the usual valves.
  • valve pumps are structurally complex and are limited in terms of their mechanical reliability, since valves form additional movable components which are subject to mechanical wear and tear and can fail.
  • the invention specified in Claim 1 is based on the object of specifying a piston pump which, with a simple mechanical construction, is highly reliable.
  • the invention is based on the knowledge that the main problem of Kolden pumps, namely to achieve the necessary piston sealing effect without increased drive expenditure, can be avoided by dispensing with a seal altogether and the liquid being conveyed by a piston which is freely movable in the cylinder.
  • the conveying effect is based on the displacement force of the piston moving forward in the direction of flow, the liquid which was sucked in during the delivery from a reservoir flowing along the piston along the piston through the gap between the piston and the cylinder wall and filling up the pump chamber.
  • a backflow of the conveyed liquid is prevented by a non-return valve, which is in use when using an overflow pipe or if there is a sufficient accumulation effect the inflow line can be dispensed with when the piston moves backward.
  • the gap flows back during the pumping phase, negligible compared to the volume conveyed, since the narrow gap represents a very high flow resistance when the piston is moving quickly.
  • the backward movement of the piston advantageously takes place slowly, the gap representing a low flow resistance and the liquid from the reservoir being able to flow into the pump chamber.
  • the power transmission to the piston can take place without contact, completely without the need for moving and sealing parts, and the pump - instead of as in the case of conventional pumps which have two valves - completely without valves or only can be done with a check valve.
  • the use of the pump according to the invention is particularly favorable for portable or implantable medication infusion systems which require precise medication delivery and offer high reliability with a simple mechanical construction.
  • pumps that consist of materials that do not influence the medication and are not attacked by the medication itself.
  • they must have a high dosing accuracy with low delivery rates and a high level of reliability and service life.
  • small dimensions, light weight and low power consumption are required.
  • Miniature pumps preferably in the form of roller and fuel pumps, have already been implemented for this purpose. However, these all have major disadvantages in terms of precision, reliability. Power consumption and refillability in the event of excessive wear of the mechanical parts in the aforementioned sense.
  • a version of the pump is favorable in which the piston cross section is large compared to the piston stroke, in particular with magnetic drive, the achievable high speed of a magnetically driven body can be favorable here use, the generation of the magnetic field only having to take place over a small path length, which accommodates the dimensioning of the snule (s) causing the magnetic field.
  • the pump according to the invention can be used for the most varied of applications without restrictions, the use as a ship drive, for example, also not being excluded.
  • the piston 3 has an outside diameter that is less than the inner diameter of the cylinder block 2, whereby a gap 4 is formed.
  • the piston 3 is moved in the direction of delivery (arrow 5).
  • the liquid is conveyed in the pumping direction (arrow 7) to a check valve, not shown.
  • Check valves of this type are available in many designs and can be selected by a person skilled in the art in view of the intended application.
  • the speed of the piston is selected so that the ratio of the amount of liquid that is conveyed to that flowing back along the piston, and thus the pressure generated by the pump, has a predetermined value.
  • the piston moves backwards at a low speed 6, which allows the liquid to flow past the piston through the gap 4 into the pump chamber 1.
  • FIG. 2 shows an embodiment of the pump in which the piston 8 is driven by means of external magnetic fields.
  • the piston 8 located in the cylinder 9 made of a drug-resistant material (plastic or titanium) consists of ferrite and is coated with plastic (Teflon).
  • plastic or titanium consists of ferrite and is coated with plastic (Teflon).
  • the piston 8 is drawn into the current-carrying coil 11 in the conveying direction 12.
  • the piston is retracted by the permanent magnet 10, whose attractive force is less than that of the current-carrying coil.
  • the liquid is sucked out of the reservoir 0 during the pumping.
  • a mechanical spring (not shown) or a second magnetic coil can also be provided.
  • the cylinder is moved counter to the conveying direction.
  • the relative movement between the piston and the cylinder takes place either due to the inertial forces of the piston or by a mechanical or magnetic locking of the piston.
  • FIG. 3 shows an embodiment in which to increase the efficiency and reduce the power requirement of the pump, the magnetic circuit of the drive coil 17 is closed with a ferrite 16 and in which a check valve is also provided in the housing 15 - described below.
  • the piston 18 consists of a coated ferrite.
  • the drive takes place by means of coil 17 and permanent magnet 13.
  • the liquid is sucked in via inlet 14 and outlet 21 is expelled.
  • the gap width 22 is in each case adapted to the viscosity of the liquid, the conveying force and the piston diameter.
  • the delivery rate per stroke is determined by the strength and duration of the current flowing in the coil 17, and the bias 20 of the sealing membrane 19.
  • the seal is made by means of a lip seal 24.
  • a stop 25 is provided in order to ensure a constant path of the piston. This makes the piston travel and thus the delivery rate independent of the position of the pump.
  • the inlet and outlet cross sections are dimensioned differently in such a way that the work of the piston is supported, i.e. they are dimensioned with regard to the gap cross-section and the viscosity or inertia of the medium to be conveyed so that a media flow corresponding to the different piston speeds takes place, which predominates in the conveying direction.
  • an overflow pipe in the form of a riser pipe is provided in the return line, which takes up medium that is transported against the conveying direction and builds up a pressure due to the height of the liquid level that counteracts the further conveying in the reverse direction. It can thus be seen that - even without using a check valve - a number of additional measures can be taken, which further increase the efficiency of the pump and its pumping action.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Reciprocating Pumps (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP19830730085 1982-09-04 1983-09-05 Pompe à piston Withdrawn EP0103536A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3233240 1982-09-04
DE19823233240 DE3233240A1 (de) 1982-09-04 1982-09-04 Kolbenpumpe

Publications (1)

Publication Number Publication Date
EP0103536A1 true EP0103536A1 (fr) 1984-03-21

Family

ID=6172659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830730085 Withdrawn EP0103536A1 (fr) 1982-09-04 1983-09-05 Pompe à piston

Country Status (2)

Country Link
EP (1) EP0103536A1 (fr)
DE (1) DE3233240A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287920A1 (fr) * 1987-04-22 1988-10-26 Siemens Aktiengesellschaft Pompe à piston pour le dosage de médicaments
US4808089A (en) * 1986-09-01 1989-02-28 Siemens Aktiengesellschaft Reciprocating pump for a medication administering device
DE19536491A1 (de) * 1995-09-29 1997-04-03 Siemens Ag Vorrichtung zur Förderung gasförmiger oder flüssiger Medien
US8241019B2 (en) 2006-07-05 2012-08-14 Hahn-Schickard-Gesellschaft Fuer Angewandte Forschung E.V. Pump element and pump having such a pump element

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348489A (en) * 1965-01-21 1967-10-24 Meyer Ernst Induction pump
DE1915094A1 (de) * 1968-03-26 1969-10-02 Ceskoslovenska Akademie Ved Elektromagnetische Mikropumpe fuer aggressive Fluesigkeiten
DE1653553A1 (de) * 1967-01-28 1971-11-25 Ernst Meyer Induktionspumpe
DE2144096A1 (de) * 1970-10-19 1972-04-20 Sherwood Medical Ind Inc Pumpeneinrichtung
US3884125A (en) * 1971-02-08 1975-05-20 Philip E Massie Variable displacement sealed pump
DE2741348A1 (de) * 1977-09-14 1979-03-15 Karl Kadletz Pumpe, insbesondere dosierpumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348489A (en) * 1965-01-21 1967-10-24 Meyer Ernst Induction pump
DE1653553A1 (de) * 1967-01-28 1971-11-25 Ernst Meyer Induktionspumpe
DE1915094A1 (de) * 1968-03-26 1969-10-02 Ceskoslovenska Akademie Ved Elektromagnetische Mikropumpe fuer aggressive Fluesigkeiten
DE2144096A1 (de) * 1970-10-19 1972-04-20 Sherwood Medical Ind Inc Pumpeneinrichtung
US3884125A (en) * 1971-02-08 1975-05-20 Philip E Massie Variable displacement sealed pump
DE2741348A1 (de) * 1977-09-14 1979-03-15 Karl Kadletz Pumpe, insbesondere dosierpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808089A (en) * 1986-09-01 1989-02-28 Siemens Aktiengesellschaft Reciprocating pump for a medication administering device
EP0287920A1 (fr) * 1987-04-22 1988-10-26 Siemens Aktiengesellschaft Pompe à piston pour le dosage de médicaments
US4883467A (en) * 1987-04-22 1989-11-28 Siemens Aktiengesellschaft Reciprocating pump for an implantable medication dosage device
DE19536491A1 (de) * 1995-09-29 1997-04-03 Siemens Ag Vorrichtung zur Förderung gasförmiger oder flüssiger Medien
US8241019B2 (en) 2006-07-05 2012-08-14 Hahn-Schickard-Gesellschaft Fuer Angewandte Forschung E.V. Pump element and pump having such a pump element

Also Published As

Publication number Publication date
DE3233240A1 (de) 1984-03-08

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19840919

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851213

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHALDACH, MAX, PROF. DR.-ING.

Inventor name: HEINZE, LOTHAR

Inventor name: NAGEL, JOACHIM, DR. RER. NAT.