EP0443665A1 - Druckpumpe - Google Patents

Druckpumpe Download PDF

Info

Publication number
EP0443665A1
EP0443665A1 EP91200297A EP91200297A EP0443665A1 EP 0443665 A1 EP0443665 A1 EP 0443665A1 EP 91200297 A EP91200297 A EP 91200297A EP 91200297 A EP91200297 A EP 91200297A EP 0443665 A1 EP0443665 A1 EP 0443665A1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
piston
working
stroke
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Withdrawn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
EP91200297A
Other languages
German (de)
English (en)
French (fr)
Inventor
Leo Betram
Hugo Dr. Schemmann
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0443665A1 publication Critical patent/EP0443665A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0075—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series
    • F04B11/0083—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series the pistons having different cross-sections

Definitions

  • the invention relates to a pressure pump for generating a pressure in a flowable medium in a device, in particular in an espresso machine, in which the force acting on a working piston in a working pump chamber increases to a maximum value during a pumping cycle during the pressure stroke and is low during the suction stroke.
  • a two-pole single-phase synchronous motor serving as the drive motor, which has a strongly changing motor torque depending on the rotor position and the current, and which has an eccentric slide which is driven directly by the permanent-magnet rotor without the interposition of a gear, alternately the working piston which can be moved in the working pump chamber moved back and forth in the pressure stroke and back in the suction stroke, inlet and outlet valves for the medium being provided in the wall of the working pump chamber.
  • a piston made of soft magnetic material is movable in a solenoid.
  • the coil is connected to the network via a diode so that current flows through it during one half-wave of the supply voltage, while it is de-energized during the other half-wave.
  • a force is exerted on the soft magnetic piston, which accelerates it against a mechanical return spring and the back pressure of the water in a piston chamber. If the pressure exceeds an adjustable limit, a valve opens and the water is pressed into the heating chamber, which is also under pressure, and from there is further pressed through the ground coffee.
  • a pressure pump which is driven by a single-phase synchronous motor and moves a piston via an eccentric or crank drive arrangement.
  • This pump which is used in an oral irrigator, is a single-phase synchronous motor of about 10 W with a permanent magnetic rotor that drives the piston. The engine returns the piston during the suction stroke.
  • This pressure pump works with flap valves. With this oral irrigation pump, an overpressure of about 2 to 4 bar can be achieved.
  • a metering pump which is actuated by an electric motor drive with a reduction gear.
  • the pressure stroke of the pump tappet takes place via an eccentric or cam disc, while the suction stroke is effected with the aid of a return spring.
  • the return spring is tensioned during the pressure stroke;
  • the greatest spring load on the motor occurs when the pump tappet is deflected to the maximum. Added to this is the operating load on the pump.
  • the motor is not loaded by the pump tappet during the suction stroke; rather, it is pushed through the return spring. Due to the reduction gear, the motor experiences a gradually increasing load during a number of revolutions during the pressure stroke, whereas it is not loaded by the piston for a few revolutions when the plunger returns.
  • the motor must be designed for the power that occurs at the end of the pressure stroke and is determined largely by the return spring, apart from the pump load. This high motor power is not required during the return.
  • the pump according to DE-PS 35 37 297 is additionally equipped with an arrangement for storing mechanical energy in the form of disc springs which can transmit a force directed against the force of the return spring to the pump tappet and which through the motor cam disk in the course of the suction stroke of the pump tappet is charged to a state of higher potential energy. During the pressure stroke against the return spring the disc spring supports the motor. Working against each other of return springs and energy storage spring reduces the performance of each of the spring systems.
  • the object is achieved according to the invention by use as a pump with valves for higher pump pressures from 8 to 18 bar, the pump being designed as a differential pump with an additional displacement piston in an additional displacement pump chamber, which is connected to the working pump chamber during the pressure stroke, the Pistons in the pump chambers alternately displace the flowable medium contained therein, and the cross section of the working piston in the working pump chamber is larger than the cross section of the displacement piston in the displacement pump chamber and thus, with the same piston stroke, the displaced volume in the working pump chamber is larger than the displaced volume in the displacement pump chamber.
  • the system After switching on the pump, the system is filled with the flowable medium.
  • the differential force of the opposing forces acts on the eccentric drive during operation directed piston forces.
  • the force acting on the eccentric can be reduced to the desired value during the pressure stroke.
  • the displacement piston in the displacement pump chamber thus supports the working piston in the working pump chamber during the pressure stroke. While the piston force in the working pump chamber drops to approximately zero during the suction stroke, the displacement piston in the displacement pump chamber still has to displace the smaller volume of liquid with the smaller piston force.
  • a force also acts on the eccentric during the suction stroke, but this force is smaller than the pressure force peak on the working piston during the pressure stroke and depends on the surface of the displacement piston and on the pressure built up during the pressure stroke.
  • Differential pumps are known per se from DE-PS 256 603 and US-PS 33 30 217. With different working piston diameters or lifting speeds, a uniform power requirement is aimed for.
  • the cross section of the working piston in the working pump chamber is approximately twice as large as that of the displacement piston in the displacement pump chamber.
  • center lines of the pump chambers and the axes of the pistons which are displaceable in them, are aligned with one another and coincide in a center line. This creates a uniaxial structure that is easy to manufacture.
  • the pistons are arranged on mutually distant sides of the eccentric.
  • the drawing shows a pump housing 1 with a water inlet socket 3 and a water outlet socket 5.
  • the water ducts 3a and 5a in the water inlet socket 3 and 5 lead to valve seats 3b, 5b which can be closed by means of valve balls 3c and 5c with the aid of valve springs 3d and 5d.
  • a working pump chamber 7 Between the valves 3e and 5e thus formed there is a working pump chamber 7, in which a working piston 9 can be displaced in the pressure direction 10 and suction direction 11.
  • the working piston 9 is connected to a slide 12 which, together with the working piston 9, is displaceable along a center line 16 in a slide guide 13.
  • the working piston 9 is attached to a side surface 18 of the slide 12 by means of an extension 17.
  • a displacement piston 21 is provided on a side 19 of the slide lying away from the side surface 18 .
  • This displacement piston 21 works in a displacement pump chamber 22.
  • Working pump chamber 7 and displacement pump chamber 22 as well as working piston 9 and displacement piston 21 are in alignment, so that their center lines or axes coincide in the center line 16.
  • the piston cross section F V in the cylindrical displacement pump chamber 22 is half the size of the piston cross section F A in the working pump chamber 7, so that, with the same piston stroke, the displaced volume in the working pump chamber 7 is twice as large as the displaced volume in the displacement pump chamber 22.
  • the displacement pump chamber 22 opens into the water duct 5a, which, coming from the valve 5e, leads in an indicated manner to a pressure container 24 (heating chamber in an espresso machine) in a device 25.
  • a pressure container 24 heating chamber in an espresso machine
  • an excess pressure forms in the water duct 5a, in the displacement pump chamber 22 and in the pressure vessel 24 of the device 25.
  • transverse slot 26 which extends transversely to the center line 16.
  • An eccentric 27 engages in this slot and is flanged onto the shaft 28 of a single-phase synchronous motor, not shown.
  • the pressure pump now works in the following way. If the slide 12 is moved in the direction of the arrow 11, the suction valve 3e opens and flowable medium, for example water, is sucked into the working pump chamber 7. After the piston stroke has been completed, the suction process is completed and the suction valve 3e closes again. The slide 12 then moves in the pressure stroke direction in accordance with the Arrow 10 to the left, then the pressure valve 5e opens, and the flowable medium in the working pump chamber 7 is expelled into the water duct 5a. This initial pumping process leads to the flowable medium being pumped into the water duct 5a, into the displacement pump chamber 22 and into the pressure vessel 24, and the system pressure is then built up in this system.
  • flowable medium for example water
  • the displacement piston 21 with the cross section F V is also pressurized.
  • the displacement piston 21 simultaneously displaces the flowable medium under pressure from the displacement pump chamber 22 into the water duct 5a.
  • a force acts on the cross section F V of the displacement piston 21 in the displacement pump chamber 22, which is half the size of the pressure force on the working piston 9 in accordance with the mentioned cross section ratio F V / F A.
  • the pressure stroke in the direction of arrow 10 therefore acts Force of the displacement piston 21 against the pressure force of the working piston 9, so that only the differential force acts on the eccentric 27, which is also half the size of the working piston 9 in the working pump chamber in accordance with the present piston cross-sectional ratios.

Landscapes

  • Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP91200297A 1990-02-17 1991-02-13 Druckpumpe Withdrawn EP0443665A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4005110 1990-02-17
DE19904005110 DE4005110C1 (es) 1990-02-17 1990-02-17

Publications (1)

Publication Number Publication Date
EP0443665A1 true EP0443665A1 (de) 1991-08-28

Family

ID=6400447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200297A Withdrawn EP0443665A1 (de) 1990-02-17 1991-02-13 Druckpumpe

Country Status (3)

Country Link
EP (1) EP0443665A1 (es)
JP (1) JPH0743772U (es)
DE (1) DE4005110C1 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592943A1 (de) * 1992-10-15 1994-04-20 Braun Aktiengesellschaft Kaffeemaschine
WO2009070876A1 (en) * 2007-12-06 2009-06-11 Gerald Lesko Mud pump
CN109124354A (zh) * 2018-08-06 2019-01-04 上海机商实业有限公司 咖啡萃取装置、咖啡机及自动咖啡售卖机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19802043A1 (de) * 1997-11-21 1999-05-27 Itt Mfg Enterprises Inc Kolbenpumpe mit mindestens zwei in einem Pumpgehäuse angeordneten Pumpenzylinder
EP2608705B2 (en) * 2010-08-27 2024-03-06 Société des Produits Nestlé S.A. Controlled motorized brewing unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE56523C (de) * C. HOPPE in Berlin N., Gartenstr. 9 — 12 Doppelt saugende und drückende Differentialkolbenpumpe mit zwei Ventilen
US3330217A (en) * 1965-07-20 1967-07-11 Binks Mfg Co Pump
DE1951347A1 (de) * 1969-10-11 1971-04-22 Casimir Wolf Von Verfahren und Vorrichtung zum Pumpen einer Substanz
DE3419177C1 (de) * 1984-05-23 1985-01-31 Philips Patentverwaltung Gmbh, 2000 Hamburg Antriebsvorrichtung mit einem Rotationsantriebsmotor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE256603C (es) *
DE3537297A1 (de) * 1985-10-19 1987-04-23 Cillichemie Antriebsvorrichtung fuer eine pumpe, insbesondere eine fluessigkeitsdosierpumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE56523C (de) * C. HOPPE in Berlin N., Gartenstr. 9 — 12 Doppelt saugende und drückende Differentialkolbenpumpe mit zwei Ventilen
US3330217A (en) * 1965-07-20 1967-07-11 Binks Mfg Co Pump
DE1951347A1 (de) * 1969-10-11 1971-04-22 Casimir Wolf Von Verfahren und Vorrichtung zum Pumpen einer Substanz
DE3419177C1 (de) * 1984-05-23 1985-01-31 Philips Patentverwaltung Gmbh, 2000 Hamburg Antriebsvorrichtung mit einem Rotationsantriebsmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 120 (M-300)(1557) 06 Juni 1984, & JP-A-59 25095 (ASAHI KASEI KOGYO) 08 Februar 1984, *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592943A1 (de) * 1992-10-15 1994-04-20 Braun Aktiengesellschaft Kaffeemaschine
US5392694A (en) * 1992-10-15 1995-02-28 Braun Aktiengesellschaft Coffee maker
WO2009070876A1 (en) * 2007-12-06 2009-06-11 Gerald Lesko Mud pump
CN109124354A (zh) * 2018-08-06 2019-01-04 上海机商实业有限公司 咖啡萃取装置、咖啡机及自动咖啡售卖机

Also Published As

Publication number Publication date
JPH0743772U (ja) 1995-09-12
DE4005110C1 (es) 1991-07-25

Similar Documents

Publication Publication Date Title
EP1748188B1 (de) Dosierpumpe
DE69723071T2 (de) Hydraulisches regelsystem für den druck einer pumpe
DE3934124A1 (de) Druckluftgetriebene pumpenanordnung
DE2646583C2 (de) Selbstansaugende Kolbenpumpe
DE4005110C1 (es)
DE2431102A1 (de) Hydraulischer hochdruckuebersetzer und druckerzeuger als antriebsaggregat fuer stromerzeugende anlagen
DE102005060436B4 (de) Aktuator
DE2312967A1 (de) Hydraulisches system mit elektromotorisch angetriebener pumpe
EP0408127A2 (de) Druckpumpe für fliessfähige Medien
DE102018203367A1 (de) Hydrostatischer Linearantrieb
DE102004042208B4 (de) Kolbenpumpe zur Förderung eines Fluids
DE2509598B2 (de) Membranpumpe
DE102018113421A1 (de) Dosierpumpe mit Linearmotor
DE2404810A1 (de) Verdraengermaschine mit einem oszillierenden, durch einen elektromotor angetriebenen verdraenger
DE2212842A1 (de) Kolbenkompressor mit linearem elektrischem Antrieb
DE3338112C2 (es)
DE19924485A1 (de) Elektromagnetische Pumpeneinheit mit Pumpe und Ventil, beide als wesentlicher Bestandteil eingebaut
DE2117838A1 (de) Elektroverdichter mit geradliniger Bewegung
EP0237740A1 (de) Druckmittelbetriebene Zylinder-Pumpen-Baueinheit
DE19948443A1 (de) Plungerpumpenaggregat, vorzugsweise für hohe Betriebsdrücke (II)
DE1553026A1 (de) Elektrisch angetriebene Motorpumpe
AT233346B (de) Kolbenpumpe mit stufenlos veränderlicher Fördermenge und damit hergestelltes hydrostatisches Getriebe
DE3826359C2 (es)
DE821308C (de) Hydraulischer Arbeitskolben
CH364395A (de) Verfahren und Vorrichtung zur Steuerung der Bewegung eines durch ein Druckmedium bewegten Kolbens

Legal Events

Date Code Title Description
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

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19920228

17Q First examination report despatched

Effective date: 19930223

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19930623