EP2101059A1 - Pompe électromagnétique avec piston à mouvement alternatif - Google Patents

Pompe électromagnétique avec piston à mouvement alternatif Download PDF

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Publication number
EP2101059A1
EP2101059A1 EP09155103A EP09155103A EP2101059A1 EP 2101059 A1 EP2101059 A1 EP 2101059A1 EP 09155103 A EP09155103 A EP 09155103A EP 09155103 A EP09155103 A EP 09155103A EP 2101059 A1 EP2101059 A1 EP 2101059A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
pump chamber
oscillating
bearing 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.)
Withdrawn
Application number
EP09155103A
Other languages
German (de)
English (en)
Inventor
Wolfgang Blaffert
Hans-Jörg Gasser
Ewald Lampl
Manfred Zucht
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.)
MSG Mechatronic Systems GmbH
Original Assignee
MSG Mechatronic Systems GmbH
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 MSG Mechatronic Systems GmbH filed Critical MSG Mechatronic Systems GmbH
Publication of EP2101059A1 publication Critical patent/EP2101059A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor

Definitions

  • the invention relates to a vibrating piston pump according to the preamble of claim 1 and a vending machine with such an oscillating piston pump.
  • Oscillating piston pumps having a gap between the pumping chamber and the piston, which gap is filled by the fluid during operation of the pump and acts as a fluid seal between the piston and the pumping chamber, are also referred to as liquid-sealed oscillating piston pumps.
  • Such oscillating piston pumps are used in particular in the automotive sector, for example, is from the WO-A1-03 / 027454 a urea pump for injecting urea into the exhaust system of a motor vehicle.
  • Vibrating piston pumps with liquid seal have the advantage that they compared to the usual oscillating piston pumps with O-ring seals (see. WO-A1-95 / 03198 ) have improved dry-running properties.
  • the known liquid seals also have disadvantages: High pressures, high flow rates and good dry suction can only be achieved by a very narrow gap between the lateral surface of the piston and the pump chamber and / or the liquid seal, must be over a long distance parallel to the longitudinal axis of the piston extend, ie the space required for the piston and thus for the whole pump is increased. The thinner the gap and the longer the gap the greater the risk that the piston is in operation tilted and then dragged on the pump chamber or even blocked.
  • the invention has for its object to provide a vibrating piston pump, which is inexpensive to produce, has good dry-running properties and a long life and yet generates a high discharge pressure.
  • the oscillating piston pump for pumping a fluid comprises at least one pump chamber having an inlet and an outlet, and at least one piston displaceable in the pump chamber parallel to its longitudinal axis. Between the pump chamber and the piston is a gap which is filled by the fluid during operation of the pump and (together with the fluid) acts as a fluid seal between the piston and the pump chamber.
  • On the jacket surface of the piston sits at least one bearing ring, preferably two bearing rings.
  • These bearing rings may be made of a non-magnetic material, such as an elastic plastic or a ceramic, which has a low coefficient of friction with respect to the material from which the pump chamber is made. Such bearing rings allow accurate guidance of the piston in the pump chamber. In addition, the risk of cold welding of the piston and pump chamber can be excluded. The otherwise necessary expensive coating of piston and / or pump chamber can be omitted.
  • Usual pump chambers are cylindrical and usual pistons correspondingly as well. Such parts can be manufactured with high precision at low cost as turned parts.
  • the liquid seal can be formed both between the lateral surface of the bearing ring and the pump chamber and / or through another gap between the piston and the pump chamber. If the gap between the outer surface of the bearing ring and the pump chamber does not or only slightly contributes to the liquid seal, then the bearing of the piston can be decoupled from the seal of the piston against the pump chamber, whereby the risk of overdetermined storage is further reduced.
  • the bearing ring is seated in a e.g. annular recess on the lateral surface of the piston, while the bearing ring can rest on one or on two opposite side surfaces and thereby fixed in the axial direction.
  • bearing ring If the bearing ring is slotted, it can be easily widened for placement on the outer surface of the piston.
  • the slot is arranged obliquely to the longitudinal axis of the piston. In addition, it can also run diagonally to the radial.
  • the slot is preferably not rectilinear, but rather corrugated and / or stepped.
  • Closed bearing rings can e.g. thermally expanded and then applied to the piston. After cooling, the bearing ring then sits tightly on the piston.
  • closed bearing rings can be pushed onto the piston and fixed with at least one pressed-on sleeve and / or at least one securing ring on the piston.
  • At least one sealing ring e.g. an O-ring.
  • the sealing ring can compensate for any irregularities of the pump chamber with its elasticity.
  • the sealing ring also ensures sufficient contact pressure of the bearing ring against the pump chamber. In addition, gap losses between the bearing ring and the piston can be avoided.
  • At least one of the two end outer edges of the bearing ring is preferably chamfered, so that the piston can be easily inserted into the pump chamber with mounted bearing ring.
  • Vending machines in which liquid-sealed oscillating piston pumps can be used include any type of hot and cold beverage dispensers or preparers, as e.g. are usually placed in self-service areas. Because of the good dry-running properties and the high achievable pressures of the liquid-sealed oscillating piston pumps, these are particularly suitable for hot water production in espresso machines.
  • the oscillating piston pump 1 in FIG. 1 has a pump sleeve 20 which is fixed by means of two clamping sleeves 95.1, 95.2 in the opening of a magnetic coil 60.
  • the clamping sleeves 95.1, 95.2 each have an external thread 96.1, 96.2, which engages in a complementary internal thread of the magnetic coil 60 and a projection 97.1, 97.2, which is an abutment for the end face of the sleeve 20.
  • the supernatant 97.1 has an internal thread, which is screwed into a connection piece as an inlet 12 of the oscillating piston pump 1.
  • a magnetic armature 80 is screwed.
  • the armature 80 has a stepped recess 81 which connects its two end faces.
  • In the channel is in a region 85, a valve chamber for a non-illustrated check valve.
  • In the areas of the threads are as usual recesses in the O-rings (not shown) are inserted.
  • a piston 30 is made of a magnetic material.
  • the piston 30 has a channel 35 which connects its end faces.
  • the channel 35 is on the outlet side (also possible inlet side) extended to a valve chamber 36 in which a non-illustrated check valve sits.
  • the piston 30 is stepped tapers on the outlet side and sits with its tapered Bereic 34 in the inlet-side region of the recess of the armature 80th
  • the piston 30 When the solenoid 60 is energized, the piston 30 is displaced parallel to the common longitudinal axis 31 of the piston 30 and the sleeve 20 in the direction of the inlet 12 against the force of a spring 50. In this case, a pump chamber is released in the recess 81 and there is a negative pressure in the recess 81. Accordingly, the valve in the valve space 85 remains closed and the valve in the valve space 36 of the channel 35 opens, so that a fluid, for example air, a gas, oil and / or water flows into the pump chamber. When the magnet is turned off or - depending on the material of the piston 30 - is reversed polarity, then the piston 30 presses the fluid through the now-opening valve in the area 85.
  • a fluid for example air, a gas, oil and / or water
  • the piston has two axially spaced bearing rings 70, each in an annular recess 90 of the outlet side tapered portion of the piston sitting (see. Fig. 2 to Fig. 4 ).
  • the outer diameter of the bearing rings is slightly larger than the outer diameter of the outlet side tapered portion of the piston 30.
  • the bearing rings are a few 1/100 mm (less than 50/100 mm, preferably less 25/100 mm) over the lateral surface 37.4 of the piston 30 in his the outlet side tapered region and sit tight on the piston 30.
  • the bearing rings 70 are made of an elastic material which has the lowest possible coefficient of friction compared to the material of the armature 80.
  • the bearing rings 70 take over both the mechanical bearing (guide) of the piston 30, as well as in cooperation with the fluid, the sealing of the gap between the piston 30 and the recess 81st
  • FIGS. 5 to 10 show greatly simplified different ways of arranging the bearing rings on two piston types.
  • the pistons in the Figures 5 . 6 9 and 10 correspond to the piston in Figure 1 to 4 ,
  • This stepped piston 30 has a larger diameter portion 33 and a reduced diameter portion 34.
  • the region 33 has a larger diameter in order to achieve the largest possible magnetic flux through the piston 30.
  • Correspondingly large is the force exerted on the piston 30 magnetic force.
  • the area of the end face of the tapered region determines, for a given force, the pressure that can be maximally generated by the oscillating piston pump.
  • the liquid seal is formed between the lateral surface 37.4 of the tapered region and the pump chamber. If, as in the FIGS.
  • one or more bearing rings are arranged on the lateral surface 37.4 of the tapered portion 34, it must be ensured when dimensioning the bearing rings 70 that they not only mechanically support the piston 30, ie guide it in the pump chamber, but are also part of the fluid seal.
  • the optimum length of the bearing rings 70 in the axial direction depends on the viscosity of the fluid to be pumped, the thickness of the gap between the corresponding bearing ring 70 and the inner wall of the pump chamber and the maximum achievable pressure and must be determined from case to case by simple experiments ,
  • bearing rings 70 seated or seated on the lateral surface 37.3 of the region 33 of the piston 30 with the larger diameter, then these bearing rings 70 serve only the mechanical support or guidance of the Kolbem 30 in the pump chamber.
  • These bearing rings 70 can be designed accordingly without the limitations resulting from the liquid seal. In this case, of course, it is to be ensured that the gap between the tapered portion 34 and the inner wall of the pump chamber with the fluid forms a liquid seal according to the requirements.
  • FIGS. 7 and 8th each show a possibility for arrangement of one or two bearing rings 70 on a substantially cylindrical piston 30th
  • FIG. 11 For example, one way to mount non-slotted bearing rings 70 onto a piston is shown.
  • One end of the piston 30 is stepped reduced in diameter, so that a bearing ring 70 can be pushed onto the piston 30 to the stage that serves as a stop.
  • a fixing ring 75 is pressed onto the tapered end of the piston 30 and sets the Laggering 70 firmly.
  • a Seegering could be used as a fixing ring 75. It only needs to be noted that the fixing ring 75 does not project radially beyond the bearing ring. This method is particularly suitable for ceramic bearing rings.
  • FIG. 12 sits a bearing ring 70 in an annular groove on the lateral surface 37 of a piston 30. Between the piston 30 and the bearing ring 70 are two spaced apart sealing rings 76, here O-rings arranged. The sealing rings sit in annular recesses of the annular groove. Of course, the bearing ring 70 does not have to sit in an annular groove for it.
  • the sealing rings 76 are elastic and can compensate for any unevenness of the inner wall of the pump chamber.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
EP09155103A 2008-03-13 2009-03-13 Pompe électromagnétique avec piston à mouvement alternatif Withdrawn EP2101059A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008014011 2008-03-13

Publications (1)

Publication Number Publication Date
EP2101059A1 true EP2101059A1 (fr) 2009-09-16

Family

ID=40809899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09155103A Withdrawn EP2101059A1 (fr) 2008-03-13 2009-03-13 Pompe électromagnétique avec piston à mouvement alternatif

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EP (1) EP2101059A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012107983A1 (de) 2011-08-29 2013-02-28 Jiming Lv Schwingkolbenpumpe
ITGE20120097A1 (it) * 2012-09-25 2014-03-26 A R S Elettromeccanica Srl Pompa a vibrazione
EP2873857A1 (fr) * 2013-11-15 2015-05-20 Defond Components Limited Pompe à fluides

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905351U (de) * 1964-08-28 1964-11-26 Hans Joachim Bamert Elektrische schwingkolbenpumpe.
WO1995003198A1 (fr) 1993-07-23 1995-02-02 Itt Automotive Europe Gmbh Systeme de freinage hydraulique avec regulation antiblocage et antipatinage
DE29518782U1 (de) * 1995-11-27 1997-03-27 Speck-Pumpen Walter Speck KG, 91154 Roth Elektromagnetische Kolbenpumpe
WO2003027454A1 (fr) 2001-09-25 2003-04-03 Argillon Gmbh Pompe a agents de reduction pour systeme de traitement de gaz d'echappement d'un moteur a combustion interne
DE102005048765A1 (de) * 2005-10-10 2007-04-12 Aweco Appliance Systems Gmbh & Co. Kg Schwingankerpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905351U (de) * 1964-08-28 1964-11-26 Hans Joachim Bamert Elektrische schwingkolbenpumpe.
WO1995003198A1 (fr) 1993-07-23 1995-02-02 Itt Automotive Europe Gmbh Systeme de freinage hydraulique avec regulation antiblocage et antipatinage
DE29518782U1 (de) * 1995-11-27 1997-03-27 Speck-Pumpen Walter Speck KG, 91154 Roth Elektromagnetische Kolbenpumpe
WO2003027454A1 (fr) 2001-09-25 2003-04-03 Argillon Gmbh Pompe a agents de reduction pour systeme de traitement de gaz d'echappement d'un moteur a combustion interne
DE102005048765A1 (de) * 2005-10-10 2007-04-12 Aweco Appliance Systems Gmbh & Co. Kg Schwingankerpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012107983A1 (de) 2011-08-29 2013-02-28 Jiming Lv Schwingkolbenpumpe
ITGE20120097A1 (it) * 2012-09-25 2014-03-26 A R S Elettromeccanica Srl Pompa a vibrazione
EP2711548A3 (fr) * 2012-09-25 2014-04-02 ARS Elettromeccanica S.r.l. Pompe à vibration
EP2873857A1 (fr) * 2013-11-15 2015-05-20 Defond Components Limited Pompe à fluides
CN104653448A (zh) * 2013-11-15 2015-05-27 东莞辰达电器有限公司 流体泵

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