EP4390125A1 - Pompe à piston double avec piston de commande déplaçable axialement - Google Patents

Pompe à piston double avec piston de commande déplaçable axialement Download PDF

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Publication number
EP4390125A1
EP4390125A1 EP23215203.3A EP23215203A EP4390125A1 EP 4390125 A1 EP4390125 A1 EP 4390125A1 EP 23215203 A EP23215203 A EP 23215203A EP 4390125 A1 EP4390125 A1 EP 4390125A1
Authority
EP
European Patent Office
Prior art keywords
piston
piston pump
double
control piston
working
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.)
Pending
Application number
EP23215203.3A
Other languages
German (de)
English (en)
Inventor
Dirk Wenning
Chris Wenning
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.)
Puwe GmbH
Original Assignee
Puwe 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 Puwe GmbH filed Critical Puwe GmbH
Publication of EP4390125A1 publication Critical patent/EP4390125A1/fr
Pending 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B2015/026—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous with a priming plunger or piston ahead of the pumping piston and connected on the same piston rod

Definitions

  • the present invention relates to a double piston pump for conveying highly viscous media according to the feature in the preamble of claim 1.
  • a double piston pump is known in which two parallel pistons, also called working pistons, transport a highly viscous medium via the pressure and suction sides.
  • Such piston pumps are used in particular in agricultural facilities to transport highly viscous media such as animal excrement, liquid manure or solid manure as well as substrate from energy crops.
  • the media to be transported have almost solid-like properties and have In addition, clumps, impurities and foreign bodies, such as stones, are present.
  • the object of the present invention is therefore to provide a piston pump which has little wear during operation, requires little maintenance and, in particular, enables filtering or separation of foreign bodies during operation.
  • the double piston pump according to the invention is suitable for transporting highly viscous media. It has a base housing. Two pistons, also called working pistons, are arranged on the base housing. These pistons run in a working cylinder. The pistons can accommodate a relatively large volume. One piston always works in suction mode and the other piston in pressure mode. When the top dead center or bottom dead center is reached, the work allocations change. The working piston from suction mode goes into pressure mode and the piston coming from pressure mode goes into suction mode. The high-viscosity medium is sucked in from a suction channel and is then located in the cylinder of the working piston and is pushed out via the pressure side with the next stroke.
  • an axially displaceable control piston is provided, which is arranged in the base housing.
  • the base housing preferably has three adjacent working chambers.
  • the control piston is arranged to be axially displaceable, at least partially, through the working chambers.
  • the working chambers are separated by the control piston in such a way that two working chambers are connected to one another in a fluid-technical manner and the third working chamber is separated from it in a fluid-technical manner. If the control piston is moved from an axial movement to the opposite axial position, a middle working chamber, which was initially separated from the third working chamber, is connected to it in a fluid-technical manner. The other working chamber, which was previously connected to the middle working chamber, is separated from it in a fluid-technical manner. This ensures that the suction operation and pressure operation of the working piston are controlled in each case.
  • the working chambers are preferably arranged next to one another in the base housing in relation to the horizontal direction.
  • the working chambers are arranged above a central intake chamber.
  • the central intake chamber is connected to an external chamber in a fluid-technical manner.
  • the intake chamber is connected to or separated from the central working chamber via the control piston.
  • cylinder liners are provided, in particular two cylinder liners are arranged axially spaced from each other.
  • Each cylinder liner preferably has recesses or openings running radially around a central length section, depending on the position of the control piston.
  • the control piston itself preferably has two piston heads located opposite each other at axial ends.
  • the piston heads run into the Cylinder liners slide. This sliding occurs due to the liquid content of the highly viscous medium.
  • the radially circumferential openings of the cylinder liners are in particular designed to be circumferentially wave-shaped. This offers two advantages according to the invention, which are explained below.
  • a first advantage of the wave-shaped opening is the fact that when the control piston is moved from one position to the other, a scissor mechanism occurs due to the wave shape.
  • the highly viscous medium and in particular solids or clumps in the medium are broken down or removed from the liner using the scissor principle. Clogging or blocking is thus avoided and the abrasive wear that affects the control piston is also reduced.
  • the double piston pump according to the invention can therefore run error-free and with little maintenance, even in continuous delivery mode.
  • the horizontally arranged control piston has another fundamental advantage.
  • a pressure equalization occurs from the pressure side or overpressure side to the suction side or underpressure side.
  • This pressure equalization is controlled in particular according to the invention in such a way that a short pressure pulse occurs.
  • This pressure pulse sediments existing solids, in particular foreign bodies and particularly preferably stones or petrified substances, in such a way that they sink into the suction chamber located below in the vertical direction. This makes it possible to filter solids and foreign substances at the same time with the double piston pump. These foreign substances or stones can then be removed via inspection hatches or by opening the base housing.
  • the pressure pulse can be generated in such a way that the axial distance between the openings of the respective cylinder liner of the piston head of the control piston is slightly greater than the axial length of the piston head.
  • these are the two maximum deflections of the waveform.
  • the cross-sectional area of the suction chamber is more than 2 times, preferably more than 2.5 times, in particular 3 times as large as the cross-section of the suction line.
  • the inflowing medium will therefore not pass through the entire cross-section of the suction chamber when flowing through the suction chamber into the work chambers above. This means that sedimented or deposited stones can collect on the bottom without being carried away by the flow.
  • the pump is designed to be low-wear and resistant to foreign bodies. It has a high suction power, which always corresponds to 0.6 to 0.8 bar. Overall, pressures of up to 10 bar are possible with low maintenance costs and flow reliability.
  • the double piston pump can provide 55 m 3 /h of highly viscous medium with an 11 kW drive.
  • FIG. 1 shows the double piston pump 1 according to the invention in a front view.
  • the double piston pump 1 has a base housing 2 arranged centrally at the bottom in relation to the vertical direction V.
  • the base housing 2 has the configuration of a trough.
  • a central suction chamber 3 is arranged at the bottom in relation to the vertical direction V.
  • at least three working chambers 4, 6 are arranged, which are not shown in detail, with a centrally arranged working chamber 5 being coupled on a pressure side to a discharge line 7 for discharging the sucked-in or pumped medium.
  • the two external working chambers are each connected to the suction chamber 3 in a fluid-technically conductive manner. Between them is a control piston 13, not shown in detail here.
  • the control piston 13 is mounted so that it can be moved axially in the horizontal direction H.
  • Two pistons 8, 9, in particular working pistons, are arranged on the base housing 2.
  • the pistons 8, 9 are used for suction and, by means of excess pressure, for pumping out the sucked-in medium.
  • stylized hydraulic piston rods are mounted in a housing above the pistons 8, 9, which cause the respective retraction and extension movement of the pistons in the axial direction.
  • Mounting arms 11 are arranged to protrude from the sides. Hydraulic cylinders 16 are also arranged in the mounting arms 11. The hydraulic cylinders 16 serve for the axial movement of the control piston 13 (not shown in detail) in the horizontal direction H.
  • FIG. 2 A medium (not shown in detail) is sucked into the central suction chamber 3 via the suction line 12.
  • the control piston 13 shown here has two piston heads 14 spaced axially from one another.
  • the piston heads 14 are coupled to one another via a piston rod 15.
  • Hydraulic drives arranged on the left and right cause a displacement of the control piston 13 in the horizontal direction H.
  • the right piston 9, related to the image plane, is in pressure mode
  • the left piston 8, related to the image plane is in suction mode.
  • a respective cylinder 17 of the pistons 8, 9 is thus either sucked full of a medium in the case of piston 8 or, in the case of piston 9, the medium is pushed out of piston 9.
  • working chambers 5 and 6 are fluidically connected to one another so that the medium is pumped out of cylinder 17 of piston 9 and conveyed through working chamber 6 into the central, middle working chamber 5 and then into discharge line 7.
  • the left piston head 14 separates the left working chamber 4 from the central working chamber 5.
  • the central suction chamber 3 or suction line 12 and piston 8 are fluidically connected to one another so that suction operation takes place here.
  • the working direction is changed.
  • the left piston 8 in relation to the image plane then pushes the previously sucked in medium into discharge line 7.
  • Piston 9 sucks in new medium.
  • the control piston 13 would be moved completely to the left-hand image plane, although this is not shown.
  • the working chambers 4 and 5 are then fluidically connected to one another and the working chamber 5 is separated from the working chamber 6.
  • two cylinder liners 18 are arranged at a distance from one another in the axial direction. These cylinder liners 18 have recesses or holes running radially around a middle length section 19. These holes can also be referred to as slots.
  • Remaining webs 20 connect a left and right part of the cylinder liner 18 to one another.
  • the respective piston head 14 of the control piston 13 passes through these recesses when the control piston 13 is adjusted in the axial direction.
  • the recesses are provided with a wave shape 21 running radially around. If, contrary to expectations, dirt or clumps get between the edge of the recess on the wave shape 21 and the piston head 14, they are sheared off according to the principle of scissors. This measure according to the invention prevents the piston 13 from jamming.
  • FIG. 3 A second aspect essential to the invention is Figure 3 shown.
  • the control piston 13 is in a middle position, so that a transition from the suction side to the pressure side can be seen on the respective piston 8, 9.
  • This pressure pulse 22 makes it possible to press impurities present in the medium, in particular sediments 23 or stones, out of the medium or into a lower corner shown here.
  • these impurities can be removed via an inspection flap (not shown in detail). This makes it possible to filter this highly viscous medium of a biogas plant.
  • Sediments 23 or stones are not fundamentally transported along, so that no oversaturation of stone material occurs during the continuous operation of a biogas plant at the subsequent processing stations or in the container of the biogas plant itself.
  • a distance 24 of the maximum deflection of the waveform 21 is slightly larger, preferably 1.01 to 1.1 times, particularly preferably 1.01 to 1.02 times, than the axial length 25 of the piston head 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP23215203.3A 2022-12-23 2023-12-08 Pompe à piston double avec piston de commande déplaçable axialement Pending EP4390125A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202022107228.0U DE202022107228U1 (de) 2022-12-23 2022-12-23 Doppelkolbenpumpe mit axial verschiebbarem Steuerkolben

Publications (1)

Publication Number Publication Date
EP4390125A1 true EP4390125A1 (fr) 2024-06-26

Family

ID=89164464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23215203.3A Pending EP4390125A1 (fr) 2022-12-23 2023-12-08 Pompe à piston double avec piston de commande déplaçable axialement

Country Status (2)

Country Link
EP (1) EP4390125A1 (fr)
DE (1) DE202022107228U1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0633767B2 (ja) * 1983-07-04 1994-05-02 三菱重工業株式会社 スラリ−ポンプ
DE19503986A1 (de) * 1995-02-07 1996-08-08 Hudelmaier Ulrike Verfahren und Vorrichtung zum Fördern von Beton oder anderen Dickstoffen
DE102004054606A1 (de) 2003-11-14 2005-08-18 Franz Wenning Durchlaufsichere Kolbenpumpe
DE202008008060U1 (de) * 2008-06-18 2008-10-02 Leifert, Rudolf Doppelkolbenpumpe
US20170204840A1 (en) * 2016-01-20 2017-07-20 Weir Minerals Netherlands B.V. Hydraulic pump system for handling a slurry medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0633767B2 (ja) * 1983-07-04 1994-05-02 三菱重工業株式会社 スラリ−ポンプ
DE19503986A1 (de) * 1995-02-07 1996-08-08 Hudelmaier Ulrike Verfahren und Vorrichtung zum Fördern von Beton oder anderen Dickstoffen
DE102004054606A1 (de) 2003-11-14 2005-08-18 Franz Wenning Durchlaufsichere Kolbenpumpe
DE202008008060U1 (de) * 2008-06-18 2008-10-02 Leifert, Rudolf Doppelkolbenpumpe
US20170204840A1 (en) * 2016-01-20 2017-07-20 Weir Minerals Netherlands B.V. Hydraulic pump system for handling a slurry medium

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DE202022107228U1 (de) 2024-03-27

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