EP1577555A1 - Pumpvorrichtung für ein Fluid - Google Patents
Pumpvorrichtung für ein Fluid Download PDFInfo
- Publication number
- EP1577555A1 EP1577555A1 EP05001953A EP05001953A EP1577555A1 EP 1577555 A1 EP1577555 A1 EP 1577555A1 EP 05001953 A EP05001953 A EP 05001953A EP 05001953 A EP05001953 A EP 05001953A EP 1577555 A1 EP1577555 A1 EP 1577555A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- fluid
- pressure
- pumping device
- space
- 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
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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
- 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
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/143—Sealing provided on the piston
-
- 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
- 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
- F04B53/123—Flexible valves
Definitions
- the invention relates to a pumping device for a fluid, in particular for a grinding fluid, with a cylinder housing, a piston element, which in the cylinder housing below Volume change of a working space for the fluid displaced is, and a piston seal between the piston element and the cylinder housing for sealing the working space is arranged.
- the invention further relates to a Fluid grinding machine for material-removing machining with a grinding fluid and a method for conveying a Fluids, in particular a grinding fluid, with a pumping device.
- piston pumps For generating an abrasive medium flow through the nozzle channels usually piston pumps are used in which a trained as a piston displacer in a cylinder housing is retracted, whereby one with the abrasive medium filled working space reduced and the abrasive medium with a pressure is applied.
- piston seals on, between arranged the displacer and the cylinder housing are.
- a piston pump, also called a cylinder pump can be used to promote abrasive abrasives is known for example from DE 2 254 660 A.
- abrasive pumps during operation a comparatively subjected to high, continuous wear.
- a piston pump often occurs a particularly high Wear on the piston seals and on the walls the cylinder tubes on.
- Wear may depend on from the mode of operation to an intrusion and / or a passage of individual abrasive grains at the gap come between sealing element and cylinder tube.
- By a steady piston movement can penetrate a grain Material removal in the form of a scratch on the inner surface of the cylinder tube cause the piston seal after can not compensate for some time.
- This can the attack surface for the grinding fluid further increased resulting in a reduction in service life for the piston seal and the cylinder tube can lead.
- the object of the invention is to provide a pumping device for a fluid, a fluid grinding machine for material-removing machining with a grinding fluid and a method for conveying a fluid with a pumping device, which ensure a particularly long service life of the piston seal and / or the cylinder housing.
- a pump device is characterized that on the side facing away from the working space of the Piston seal a lock space for receiving a barrier fluid is provided, and that means for aligning the Pressure in the lock chamber to the pressure in the working space provided are.
- a basic idea of the invention is that a Pressure difference at the piston seal at least during insertion of the piston element reduced in the cylinder housing becomes. Such a pressure difference can result in forces have the fluid or components contained therein the working space out into the area of the piston seal Press while damaging the pumping device being able to lead.
- the piston seal thus stands on the one hand with the fluid in the working space, on the other hand with the Locking fluid in the lock chamber in contact.
- the pressure of the barrier fluid in the lock chamber at least when inserting the piston element in the Piston housing, i. with volume reduction of the working space, to match the pressure of the fluid in the working space.
- the pressure difference at the piston seal at least when inserting the piston element reduced in the cylinder housing and consequently a passage of fluid or its constituents on the piston seal largely prevented, in which case the piston seal in particular as a scraper for fluid or its components can work.
- the pressure difference as far as possible between the work area and the lock room to minimize can also be provided by the Means for equalizing the pressures of a predetermined residual pressure difference is set. Since usually the pressure in the Working space and thus the pressure difference at the piston seal when retracting the piston element in the cylinder housing is considerably higher than when pulling out the piston element from the cylinder housing can increase the service life the piston seal be sufficient that the Press in the lock chamber and in the workspace only when retracting be equalized to the piston element. It can, however be provided, the pressures even when pulling out of Piston element or, if this is stopped to equalize.
- the cylinder housing is tubular with approximately formed circular inner cross-section.
- the cylinder housing can be of any shape be designed, which is suitable for limiting a work space is.
- pressure in particular a fluid pressure understood become.
- the lock space is complete filled with the barrier fluid, wherein the barrier fluid is preferred a liquid, in particular a lubricious working medium is.
- the piston seal suitably has at least one Seal element, which preferably designed as a piston ring is.
- Seal element which preferably designed as a piston ring is.
- several, in particular two, Provided sealing elements are provided.
- the blocking space at least partially provided outside of the cylinder housing.
- the lock space in the cylinder housing is arranged. This will be a particularly compact Received pumping device.
- a first preferred embodiment of the invention Pumping device is characterized in that in the cylinder housing on the side facing away from the working space of the Piston element is provided a locking piston element that the lock space of the piston member and the locking piston element is limited, and that the piston element for aligning the pressure in the lock chamber to the pressure in the working space is mounted floating relative to the locking piston element.
- This embodiment can also be described as a double piston device, the piston element as a floating piston and the locking piston element be referred to as a solid piston.
- the lock space between the piston element and the locking piston member provided. To the piston element On the one hand, the working space borders on the other hand the lock room.
- the Piston element Due to the floating storage of the Piston element acts as a stamp, at least during insertion of the piston element in the cylinder housing a compressive force due to the pressure in the working space on the Locking space transfers and thus to equalize the pressures in serves these two rooms.
- the piston element suitably rigid.
- this first preferred Embodiment have the means for matching the pressure in the lock chamber to the pressure in the work area so on the piston element.
- a particularly useful development of the double piston device is that a piston rod to move the piston element is provided and that the Locking piston element is attached to the piston rod.
- the piston element slidably on stored the piston rod.
- the dual piston device is further preferred further developed in that a stop is provided, the distance between the piston member and the locking piston element limited.
- the attack can in particular serve, a maximum displacement between the piston element and the locking piston element when retracting the Piston element and the locking piston element from the cylinder housing set and thus a predetermined volume pretend in the restricted area.
- a particularly useful embodiment of the invention is in that, in particular outside the cylinder housing a pendulum container for barrier fluid is arranged, the is in fluid communication with the lock chamber.
- This pendulum container can serve to reduce the amount of barrier fluid in the To keep the restricted area constant. Possible losses of barrier fluid from the lock chamber during operation of the pumping device due to leaks can thus be compensated.
- barrier fluid only upon retraction of the piston member from the cylinder housing to be fed from the pendulum container in the lock room, as in in this case pressure in a buffer room usually considerably is lower than when retracting the piston element and thus a supply of barrier fluid into the lock chamber with less Effort is possible.
- Barrier fluid by means of a negative pressure, which occurs during retraction of the piston element from the working space there sets and the over the floating piston element is passed into the lock room, to initiate the lock room.
- the pendulum container can also be used as an expansion tank be designated.
- a pendulum container it is special advantageous that between the lock chamber and the pendulum container a check valve is arranged, which only one directed by the pendulum container in the lock chamber Pass blocking fluid flow.
- An opposite denser barrier fluid flow into the pendulum container is By contrast, blocked by such a check valve.
- the check valve can basically be considered as any backflow preventer be educated.
- Double piston device is that a spring device is provided, through which the piston element opposite is spring loaded the locking piston element. Especially the spring device can the locking piston element from Press the piston element away against the stop. Such Spring device can be undesirable pressure surges in the lock chamber and diminish at the check valve.
- An alternative, second preferred embodiment of a Pumping device is characterized in that that the piston seal arranged on the cylinder housing is, and that on the cylinder housing on one of the working space opposite side of the piston seal arranged a barrier seal is, with the lock space from the piston seal and the barrier seal is limited.
- This embodiment in which the seal on the inner wall the cylinder housing sits, can also be used as a plunger device and the piston member then called a plunger become.
- a plunger device are the piston seal and / or the sealing seal in particular static, i. not movable on the cylinder housing arranged.
- the lock chamber is on the one hand by the piston seal and on the other hand limited by the barrier seal.
- the sealing seal suitably has at least one barrier sealing element on, which is preferably designed as a piston ring.
- a plunger device is the Sperr Hurm suitably designed as an annulus, the in the cylinder housing around the piston element runs around.
- a plunger device can in principle also a pendulum container for barrier fluid be provided with the lock chamber, preferably via a check valve, in Fluid connection is.
- the pendulum can also serve to compensate barrier fluid losses from the lock space.
- a monitoring device for the amount of the lockroom located Provide barrier fluids.
- Such a monitoring device may preferably have a pressure gauge. By such Monitoring device can be detected in particular be whether fluid flows from the working space to the blocking space, which indicates a risk to the grinding process.
- a particularly preferred embodiment of the invention Pumping device is that the means for Adjusting the pressure in the lock chamber to the pressure in the working space
- a pressure equalization line which on the one hand with the work space and on the other hand with the lock room connected is.
- a pressure equalization line can especially advantageous in a plunger device.
- the pressure equalization line runs at least partially outside the cylinder housing.
- a pressure compensation line allows a particularly reliable Pressure equalization between the working room and the lock room at low expenditure on equipment.
- a fluid-blocking pressure transmission element in particular, a membrane is provided.
- a membrane is provided in the pressure equalization line.
- stamp in the pressure equalization line also Stamp be provided.
- a particularly advantageous embodiment of an inventive Pumping device is characterized that the fluid is a carrier fluid, in particular granular Having abrasive particles. Under a fluid can do this basically every flowable continuum can be understood.
- the fluid is one Liquid.
- the carrier fluid suitably has a mineral Oil on. It can be particularly magnetorheological, electrorheological and / or thixotropic properties exhibit.
- a particularly inexpensive development of Invention is that the barrier fluid also the Carrier fluid has.
- a fluid grinding machine according to the invention is characterized in that that at least one pumping device according to the invention is provided.
- a fluid grinding machine according to the invention especially for inner hole grinding be provided.
- An inventive method for conveying a fluid is performed with a pumping device according to the invention. It is characterized in that at least at Insertion of the piston element into the cylinder housing Pressure in the lock chamber matched to the pressure in the work area becomes.
- FIG. 1 A longitudinal section through a double piston device designed pumping device is shown in Fig. 1 and 2.
- the pumping device has a cylinder housing 15th in which a piston element 20 under volume reduction a working space 12 retractable and under increased volume of the working space 12 can be moved out.
- Fig. 1 is the piston member 20 in the cylinder housing 15 both left side in a fully retracted position as well right side in a fully retracted position shown.
- the working space 12 is during a filling stroke filled with abrasive fluid, which during a working stroke is discharged again.
- Piston seal 21 On the piston element 20 is designed as a sealing ring with two guide rings Piston seal 21 is provided, which the inner surfaces of the Cylinder housing 15 seals.
- the piston seal 21 runs while in a groove which rotates the piston member 20.
- the pumping device further comprises a locking piston element 24 on, seen from the working space 12 from behind the piston element 20 is arranged.
- a locking piston element 24 circumferential groove is used to seal the inner surfaces of the Cylinder housing 15 as a sealing ring with two guide rings trained piston seal 25 arranged.
- a bolt 29 is arranged, the coaxial and central to the cylinder housing 15 to the working space 12 to extend and an extension of a piston rod 26 represents.
- On the bolt 29 is the piston element 20 displaceable relative to the locking piston element 24th mounted, whereby the piston member 20 an axial compensation movement along the piston rod 26 in the direction of Locking piston element 24 can perform.
- Locking space 10 is formed for receiving a barrier fluid.
- the piston element 20 has an end cover 61 with a static sealing element, thereby preventing penetration of grinding fluid in the lock space 10 effectively prevented can be.
- the spaces of the pumping device can also as Chambers are called.
- This stop 28 serves to limit a displacement the piston member 20 against the locking piston element 24 with the bolt 29.
- This the working space 12 facing stop surface corresponds to a the work space 12th opposite abutment surface on the stop 28.
- a coil spring spring device 13 is provided which the piston member 20 from the locking piston element 24 away against the stop 28 presses.
- a pendulum container 17th provided for receiving barrier fluid. Via lines 18, 18 ', 18' 'is the pendulum container 17 with the lock chamber 10th in fluid communication.
- a check valve on the locking piston element 24 16 provided, which one from the lock chamber 10th in the pendulum container 17 directed barrier fluid flow blocks.
- the check valve 16 on a ball 8 the via a trained as a helical spring check valve spring 7 pressed against the lock-space-side end of the line 18 '' becomes.
- the check valve spring 7 is supported on its side facing away from the ball 8 on the piston element 20th from.
- the cylinder housing 15 is on the one hand of a ring-like Connecting flange 4, also referred to as a sealing piston can be completed, in which the line 18 'runs.
- a connecting flange 4 Through the connecting flange 4, the piston rod extends 26, for moving the piston member 20 and the locking piston member 24 firmly connected to the latter is.
- sealing members 62 Between the connecting flange 4 and the piston rod 26 while sealing members 62 are provided.
- a leakage connection 63 is provided.
- the piston rod 26 with a hydraulic piston element 3 of a hydraulic cylinder 2 connected to the movement of the piston rod 26 can be acted upon with hydraulic fluid.
- the hydraulic cylinder 2 has a hydraulic cylinder housing 5, the coaxial with the cylinder housing 15 and the piston rod 26th attached to the connecting flange 4.
- the Piston element 20 may together with the locking piston element 24 may also be referred to as a piston pack.
- FIGs. 3 and 4 A further embodiment of a pump device according to the invention is shown in Figs. 3 and 4.
- This as Plunger device formed pumping device has a designed as a plunger piston member 40, the under volume reduction of a working space 32 in a cylinder housing 35, 35 'retractable and under increased volume is extendable.
- the piston member 40 is both on the left in a fully retracted as also on the right side in a completely retracted position shown.
- the pump device For sealing the working space 32, the pump device as a sealing ring, in particular as a rod seal or double-acting rod seal pair trained Piston seal 41 on, which on the inner wall of the cylinder housing 35, 35 'is attached.
- a sealing ring On the work space 32nd opposite side of the piston seal 41 is on the inner wall the cylinder housing 35, 35 'further as a sealing ring, in particular as a rod seal or double-acting Rod seal pair trained locking seal 43 arranged.
- the barrier seal 43 and the piston seal 41 are executed identical construction and material. Between the Piston seal 41 and the sealing seal 43 is approximately arranged annularly shaped blocking space 30, which with a barrier fluid can be filled.
- the pressure in the lock chamber 30 at least when retracting the piston member 40 in the working space 32, i. at the working stroke, at the pressure in the Work room 32 are aligned.
- Such pressure equalization can in principle by a Control device take place, in which case the pressure in the working space 32 measured and accordingly the pressure in the lock chamber 30 can be actively regulated.
- the pressures provided a pressure equalization line 37, 37 ', with both the work space 32 and with the Locking space 30 is in communication.
- a pressure equalization line 37, 37 ' To prevent a Passage of fluid from the working space 32 in the lock chamber 30 is in the pressure equalization line 37, 37 'as a Membrane formed, fluid-tight pressure transmission element 36 arranged.
- During the working stroke produces the Feed of the piston element 40 a pressure in the working space 32, which transfer via the membrane to the barrier fluid is, whereby the pressure difference at the piston seal 41st is largely reduced.
- abrasive fluid through the piston seal 41 is pressed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Nozzles (AREA)
Abstract
Description
- Fig. 1
- einen Längsschnitt durch eine erfindungsgemäße, hydraulisch vorgesteuerte Pumpvorrichtung, die als Doppelkolbenvorrichtung ausgebildet ist;
- Fig. 2
- eine Detailansicht der Pumpvorrichtung aus Fig. 1;
- Fig. 3
- einen Längsschnitt durch eine erfindungsgemäße Pumpvorrichtung, die als Plungervorrichtung ausgebildet ist; und
- Fig. 4
- eine Detailansicht der Pumpvorrichtung aus Fig. 3.
Claims (14)
- Pumpvorrichtung für ein Fluid, insbesondere für ein Schleiffluid, miteinem Zylindergehäuse (15, 35),einem Kolbenelement (20, 40), das in dem Zylindergehäuse (15, 35) unter Volumenänderung eines Arbeitsraums (12, 32) für das Fluid verschiebbar ist, undeiner Kolbendichtung (21, 41) die zwischen dem Kolbenelement (20, 40) und dem Zylindergehäuse (15, 35) zur Abdichtung des Arbeitsraums (12, 32) angeordnet ist,dass an der dem Arbeitsraum (12, 32) abgewandten Seite der Kolbendichtung (21, 41) ein Sperrraum (10, 30) zur Aufnahme eines Sperrfluides vorgesehen ist, unddass Mittel zum Angleichen des Drucks im Sperrraum (10, 30) an den Druck im Arbeitsraum (12, 32) vorgesehen sind.
- Pumpvorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass der Sperrraum (10, 30) im Zylindergehäuse (15, 35) angeordnet ist. - Pumpvorrichtung nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,dass im Zylindergehäuse (15) auf der dem Arbeitsraum (12) abgewandten. Seite des Kolbenelements (20) ein Sperrkolbenelement (24) vorgesehen ist,dass der Sperrraum (10) von dem Kolbenelement (20) und dem Sperrkolbenelement (24) begrenzt wird, unddass das Kolbenelement (20) zum Angleichen des Drucks im Sperrraum (10) an den Druck im Arbeitsraum (12) schwimmend gegenüber dem Sperrkolbenelement (24) gelagert ist. - Pumpvorrichtung nach Anspruch 3,
dadurch gekennzeichnet,dass eine Kolbenstange (26) zum Verschieben des Kolbenelements (20) vorgesehen ist unddass das Sperrkolbenelement (24) an der Kolbenstange (26) befestigt ist. - Pumpvorrichtung nach einem der Ansprüche 3 oder 4,
dadurch gekennzeichnet, dass ein Anschlag (28) vorgesehen ist, der den Abstand zwischen dem Kolbenelement (20) und dem Sperrkolbenelement (24) begrenzt. - Pumpvorrichtung nach einem der Ansprüche 3 bis 5,
dadurch gekennzeichnet, dass insbesondere außerhalb des Zylindergehäuses (15) ein Pendelbehälter (17) für Sperrfluid angeordnet
ist, der mit dem Sperrraum (10) in Fluidverbindung steht. - Pumpvorrichtung nach Anspruch 6,
dadurch gekennzeichnet, dass zwischen dem Sperrraum (10) und dem Pendelbehälter (17) insbesondere am Sperrkolbenelement (24) ein Rückschlagventil (16) angeordnet ist, welches lediglich einen vom Pendelbehälter (17) in den Sperrraum (10) gerichteten Sperrfluidstrom passieren lässt. - Pumpvorrichtung nach einem der Ansprüche 3 bis 7,
dadurch gekennzeichnet, dass eine Federeinrichtung (13) vorgesehen ist, durch welche das Kolbenelement (20) gegenüber dem Sperrkolbenelement (24) federbelastet ist. - Pumpvorrichtung nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,dass die Kolbendichtung (41) am Zylindergehäuse (35) angeordnet ist, unddass am Zylindergehäuse (35) auf einer dem Arbeitsraum (32) abgewandten Seite der Kolbendichtung (41) eine Sperrdichtung (43) angeordnet ist, wobei der Sperrraum (30) von der Kolbendichtung (41) und der Sperrdichtung (43) begrenzt wird. - Pumpvorrichtung nach Anspruch 9,
dadurch gekennzeichnet, dass die Mittel zum Angleichen des Drucks im Sperrraum (30) an den Druck im Arbeitsraum (32) eine Druckausgleichsleitung (37, 37') aufweisen, welche einerseits mit dem Arbeitsraum (32) und andererseits mit dem Sperrraum (30) verbunden ist. - Pumpvorrichtung nach Anspruch 10,
dadurch gekennzeichnet, dass in der Druckausgleichsleitung (37, 37') ein fluidsperrendes Druckübertragungselement (36), insbesondere eine Membran, vorgesehen ist. - Pumpvorrichtung nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, dass das Fluid ein Trägerfluid mit Abrasivpartikeln aufweist und dass das Sperrfluid ebenfalls das Trägerfluid aufweist. - Fluidschleifmaschine zur materialabtragenden Bearbeitung mit einem Schleiffluid,
dadurch gekennzeichnet, dass mindestens eine Pumpeinrichtung nach einem der Ansprüche 1 bis 12 vorgesehen ist. - Verfahren zum Fördern eines Fluides, insbesondere eines Schleiffluides, mit einer Pumpvorrichtung nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet , dass zumindest beim Einschieben des Kolbenelements (20, 40) in das Zylindergehäuse (15, 35) der Druck im Sperrraum (10, 30) an den Druck im Arbeitsraum (12, 32) angeglichen wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004013142 | 2004-03-17 | ||
DE102004013142A DE102004013142A1 (de) | 2004-03-17 | 2004-03-17 | Pumpvorrichtung für ein Fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1577555A1 true EP1577555A1 (de) | 2005-09-21 |
EP1577555B1 EP1577555B1 (de) | 2008-01-02 |
Family
ID=34833156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05001953A Not-in-force EP1577555B1 (de) | 2004-03-17 | 2005-01-31 | Pumpvorrichtung für ein Fluid |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1577555B1 (de) |
AT (1) | ATE382794T1 (de) |
DE (2) | DE102004013142A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013117420A1 (de) * | 2012-02-07 | 2013-08-15 | Hedrich Gmbh | Verfahren und v0rrichtung, insbesondere dosierpumpvorrichtung, zum d0sierten abgeben von giessfähigen stoffen mit einer druckkammer |
CN106194628A (zh) * | 2016-07-08 | 2016-12-07 | 净化控股集团股份有限公司 | 液压泥饼柱塞泵 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018120582A1 (de) | 2018-08-23 | 2020-02-27 | Schwing Gmbh | Kolbenpumpe für Dickstoffe mit Wasserkasten |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2254660A1 (de) * | 1971-11-08 | 1973-05-10 | Honda Koki Kk | Hydraulisches schleifverfahren |
US4476771A (en) * | 1982-09-30 | 1984-10-16 | University Of Kentucky Research Foundation | Self-flushing piston assembly for slurry pump |
US20020141891A1 (en) * | 2001-03-28 | 2002-10-03 | Eric Gunderson | Abrasive liquid pump apparatus and method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1565879A (en) * | 1977-08-19 | 1980-04-23 | British Hydromechanics | High pressure piston pumps |
DE3725221A1 (de) * | 1987-07-30 | 1989-02-09 | Hausherr & Soehne Rudolf | Kolbenpumpe mit arbeitskolben zur verdichtung von fluessigkeiten und gasen |
DE10015875C2 (de) * | 2000-03-30 | 2002-02-07 | Sonplas Gmbh | Verfahren zur Bearbeitung eines Düsenelementes für Einspritzventile |
-
2004
- 2004-03-17 DE DE102004013142A patent/DE102004013142A1/de not_active Withdrawn
-
2005
- 2005-01-31 DE DE502005002368T patent/DE502005002368D1/de active Active
- 2005-01-31 EP EP05001953A patent/EP1577555B1/de not_active Not-in-force
- 2005-01-31 AT AT05001953T patent/ATE382794T1/de not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2254660A1 (de) * | 1971-11-08 | 1973-05-10 | Honda Koki Kk | Hydraulisches schleifverfahren |
US4476771A (en) * | 1982-09-30 | 1984-10-16 | University Of Kentucky Research Foundation | Self-flushing piston assembly for slurry pump |
US20020141891A1 (en) * | 2001-03-28 | 2002-10-03 | Eric Gunderson | Abrasive liquid pump apparatus and method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013117420A1 (de) * | 2012-02-07 | 2013-08-15 | Hedrich Gmbh | Verfahren und v0rrichtung, insbesondere dosierpumpvorrichtung, zum d0sierten abgeben von giessfähigen stoffen mit einer druckkammer |
CN106194628A (zh) * | 2016-07-08 | 2016-12-07 | 净化控股集团股份有限公司 | 液压泥饼柱塞泵 |
Also Published As
Publication number | Publication date |
---|---|
DE102004013142A1 (de) | 2005-10-06 |
DE502005002368D1 (de) | 2008-02-14 |
EP1577555B1 (de) | 2008-01-02 |
ATE382794T1 (de) | 2008-01-15 |
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