EP3268607B1 - Hydraulic pump system for handling a slurry medium - Google Patents

Hydraulic pump system for handling a slurry medium Download PDF

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Publication number
EP3268607B1
EP3268607B1 EP16718503.2A EP16718503A EP3268607B1 EP 3268607 B1 EP3268607 B1 EP 3268607B1 EP 16718503 A EP16718503 A EP 16718503A EP 3268607 B1 EP3268607 B1 EP 3268607B1
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EP
European Patent Office
Prior art keywords
discharge
hydraulic
pump system
piston
valve
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.)
Active
Application number
EP16718503.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3268607A1 (en
Inventor
Arnoldus Gertrudis Hendrikus Wilmsen
Ronald Godefridus Anna KEIJERS
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.)
Weir Minerals Netherlands BV
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Weir Minerals Netherlands BV
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Publication date
Priority claimed from AU2015900822A external-priority patent/AU2015900822A0/en
Application filed by Weir Minerals Netherlands BV filed Critical Weir Minerals Netherlands BV
Publication of EP3268607A1 publication Critical patent/EP3268607A1/en
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Publication of EP3268607B1 publication Critical patent/EP3268607B1/en
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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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
    • 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

Definitions

  • US2006/159574A1 describes a double-acting piston pump with a reduced workspace inside the pump cylinder on both sides exhibiting a simultaneous intake and discharge action in both halves of the pump cycle.
  • a lever system is implemented to activate inlet valves and outlet valves, such that an alternate inlet and outlet valve are opened and closed for each double-acting intake and discharge action.
  • US4177016 describes a hydraulic pump system comprising a pump housing having one central inlet interconnecting several suction inlets in the pump housing as well as one central outlet interconnecting several discharge outlets in said pump housing.
  • JP2001-207952 describes a control device for a reciprocating piston pump in order to reduce shocks and generated noise when a liquid passage is switched.
  • Such reciprocating positive displacement pumps are used for pumping slurry media against relatively high pressure, when compared to single stage centrifugal pumps, for example. Further characteristics of such positive displacement pumps include high efficiency and an accurate flow output, but a relatively low flow capacity when compared to centrifugal pumps.
  • multiple positive displacement pumps can be arranged in parallel in a manner so that their suction inlets and/or discharge outlets are connected and combined into a single suction and/or discharge line. This means that the sum flow of the individual pumps can meet the total flow requirements of the application.
  • the combination of the individual displacement pumps and the interconnecting suction and discharge lines forms a pumping system.
  • a phase shift control system for a pump system comprised of multiple reciprocating positive displacement pumps, wherein the speed of the individual pumps is controlled such that a desired phase shift between the pump cycles of the individual pumps is obtained and maintained.
  • Each discharge outlet of the individual pumps is provided with a discharge valve, which is to be opened and closed at the right time during the individual pump cycles of the individual pumps.
  • the discharge valves also are closed and opened in a controlled manner, preferably such that the pressure across the discharge valve is zero.
  • said lever assembly comprises a lever having two ends, each end being hingely connected with the piston of one of said piston/cylinder driven valves.
  • piston/cylinder discharge valves are hydraulic piston/cylinder driven discharge valves and wherein said control means comprise a hydraulic line interconnecting both cylinders of said hydraulic piston/cylinder driven discharge valves.
  • the hydraulic line can interconnect both cylinders at the piston side thereof, whereas in another embodiment said hydraulic line interconnects both cylinders at the cylinder side thereof.
  • each hydraulic piston/cylinder driven discharge valve can comprise a first sensor for sensing the position of the piston in the closed position of the discharge valve as well as a second sensor for sensing the position of the piston in the open position of the discharge valve.
  • the system may further comprise an hydraulic refill means for adding hydraulic medium to a hydraulic piston/cylinder driven discharge valve based on signals generated by the first sensor of a discharge valve and the second sensor of the other discharge valve such that the combined hydraulic volume of both pistons chambers and the interconnecting hydraulic line is always so that the pistons will reach their extreme position during operation of the pump system.
  • an hydraulic refill means for adding hydraulic medium to a hydraulic piston/cylinder driven discharge valve based on signals generated by the first sensor of a discharge valve and the second sensor of the other discharge valve such that the combined hydraulic volume of both pistons chambers and the interconnecting hydraulic line is always so that the pistons will reach their extreme position during operation of the pump system.
  • the pump system can further comprise a pump housing having a central inlet interconnecting both suction inlets as well as a central outlet interconnecting both discharge outlets.
  • said pump housing can comprise two pump chambers, each pump chamber being interconnected with one of said reciprocating positive displacement pumps, and each pump chamber being provided with a suction inlet and a discharge outlet.
  • FIG. 1 and Figure 2a combined disclose a non-limitative embodiment of an hydraulic pump system.
  • the hydraulic pump system is denoted with reference numeral 10 and consists of at least two reciprocating positive displacement pumps 100 and 200 which are connected to a pump housing 11.
  • Each of the reciprocating positive displacement pumps 100 and 200 consist of a pump structure in which a displacement element 101 (201), shaped as a piston, is movable accommodated in a cylinder housing 104 (204).
  • the displacement element 101 (201) is connected via a piston rod 102 (202), which is displaced in a reciprocating manner using a pump drive mechanism 103 (203), not shown.
  • Such a reciprocating positive displacement pump is capable of pumping or handling a slurry medium against relatively high pressure when compared to other types of pumps, such as centrifugal pumps.
  • a positive displacement pump (as denoted with reference numeral 100 in Figure 1 ) can operate at a high pressure level and generate an accurate flow output of the slurry medium to be displaced, albeit with a relatively low flow capacity.
  • multiple reciprocating positive displacement pumps (in Figure 1 two of such pumps 100, 200 are shown) are used in a parallel manner as depicted in Figure 1 and their combined pump characteristic is used for obtaining the required and necessary increased discharge flow of the slurry medium.
  • the pump drive mechanism 103 (203) are driven in such a manner that the displacement elements 101 (201) are moving in a reciprocating manner, but also in an 'out-of-phase' manner. This means that one positive displacement pump performs its discharge stroke, whereas the other positive displacement pump performs its suction stroke.
  • the alternating suction and discharge strokes of the two positive displacement pumps results in a combined discharge flow of the individual pumps, the sum of which can meet the total flow requirements of the industrial application in which the hydraulic pump system is to be implemented.
  • FIG 2a discloses in more detail another part of the pump system 10 in particular the pump housing 11 to which both reciprocating positive displacement pumps 100 and 200 are connected.
  • the pump housing 11 is provided with a central suction inlet 12 and a central discharge outlet 18 for the intake and discharge of slurry medium to be pumped by the pump system 10.
  • the central suction inlet 12 is in fluid communication with suction inlet chambers 14a (14b) via suction inlets 13a (13b).
  • Each individual suction inlet 13a (13b) can be opened and closed by so-called hydraulic piston/cylinder driven suction valves 30a (30b).
  • Each suction valve 30a (30b) comprises a valve body 31a (31b) which cooperates with the seat of the individual suction inlet 13a (13b) when said suction valve 30a (30b) is in his closed position.
  • Each valve body 31a (31b) is mounted to a piston rod 32a' (32b'), which rod 32a' (32b') is provided with a piston element 32a (32b) which is movable accommodated in in a valve housing 30a' (30b').
  • the piston element 32a (32b) and the valve housing 30a' (30b') define a cylinder chamber 33a (33b) which is filled with a hydraulic medium.
  • the hydraulic medium can be introduced in an alternating manner on either side of the piston element 32a (32b) via hydraulic lines 34a -35a (34b-35b) and by means of a manifold valve 36a (36b) which connects to supply lines P2 and T2.
  • Supply line P2 contains a reservoir 40 for hydraulic medium.
  • Supply of hydraulic medium to either side of the piston element 32a (32b) causes the hydraulic valve 30a (30b) to open or close the respective suction inlet 13a (13b) by means of the valve body 31a (31b).
  • Each suction chamber 14a (14b) is in fluid communication with the cylinder chamber 104 (204) in which the displacement element 101 (201) is displaced in a reciprocating manner during operation.
  • Each individual suction chamber 14a (14b) is furthermore provided with a discharge outlet 15a (15b). Both discharge outlets 15a (15b) communicates in a combined discharge chamber 16 and further with the central discharge outlet 18.
  • Both individual discharge outlets 15a (15b) are arranged to be opened and closed by discharge valves 20a (20b).
  • Each discharge valve 20a (20b) comprises a valve body 21a (21b) which cooperates with the seat of the individual discharge outlet 15a (15b) when said discharge valve 20a (20b) is in his closed position.
  • the discharge valve 20b is depicted in its closed position where valve body 21b fits in the seat of the discharge outlet 15b thereby closing the suction chamber 14b from the combined discharge chamber 16.
  • the discharge valve 20a is in its open position allowing fluid communication between the suction chamber 14a and the central discharge chamber 16 (and hence the central discharge outlet 18).
  • suction valve 30a is in its closed position having a valve body 31a which closes the seat of the suction inlet 13a.
  • the other suction valve 30b is in its open condition allowing the suction inlet 13b to be in fluid communication with the central inlet 12 and the suction chamber 14b.
  • the positive displacement pump 100 performs its discharge stroke wherein the discharge element 101 is displaced in the cylinder 104 discharging any slurry medium contained in the suction chamber 14 via the discharge outlet 15a, the central discharge chamber 16 towards the central discharge outlet 18, and hence out of the pump system.
  • the positive displacement pump 200 performs its suction stroke wherein the displacement element 201 performs a movement which is contrary to the movement of the displacement element 101 of the positive displacement pump 100 during the discharge stroke.
  • slurry medium is taken from the central suction inlet 12 through the suction inlet 13b into the suction chamber 14b.
  • the intake amount of slurry via the suction inlet is defined by the amount of slurry medium being displaced by the previous discharge stroke of said positive displacement pump.
  • the suction valve 30b is closed under simultaneous opening of the suction valve 30a.
  • the discharge valve 20a is closed whereas the discharge valve 20b is opened.
  • the subsequent suction stroke of the positive displacement pump 100 causes slurry medium to be taken in the now discharged pump chamber 14a via the suction inlet 13a and the slurry medium contained in the other suction chamber 14b is now being discharged by the positive displacement pump 200 during its discharge stroke. Said discharged slurry medium is forced through the now open discharge outlet 15b into the combined discharge chamber 16 and towards the central discharge outlet 18.
  • the discharge valves are operated independently.
  • the valve body 21b together with the part of the piston rod 22b extending in the discharge chamber 16 represents a certain volume, which is not occupied by slurry medium present in the discharge chamber 16.
  • this volume previously occupied by the extended piston rod and valve body becomes available to the overall slurry medium volume in the discharge chamber 16. This extra volume becoming available causes a volume drop and hence a temporary pressure drop occurs.
  • each positive displacement pump performs a pre-compression stroke on the slurry medium to be discharged in their respective pumping chamber 14a (or 14b) prior to the opening of the respective valve body 21a (or 21b) of the discharge valves 20a (or 20b).
  • Such pre-compression stroke is depicted in Figure 3 , which discloses to the pump characteristic and sequence control of one displacement element 101 (201) of each positive displacement pump.
  • Each pump performs three stages in a sequential manner:
  • the pump system 10 as disclosed in Figure 1 and 2a is capable of generating a discharge flow of the displaced slurry medium through the central discharge outlet 18 with no pressure fluctuations resulting in a constant consistency of the biomass slurry medium. This leads to an improved and constant product quality of the biomass slurry medium for further processing in a biomass installation.
  • control means which control the alternate closing and opening of both piston/cylinder discharge valves 20a-20b, such that during operation no volume difference occurs in the discharge 18 of slurry medium.
  • said control means comprise a hydraulic line 24 which interconnects both cylinder chambers 23a and 23b of the discharge valves 20a and 20b.
  • each discharge valve 20a comprises a valve body 21a (21b) which fits in the seat of the discharge outlet 15a (15b).
  • the valve body is mounted on a piston rod 22a' (22b') which ends with a piston element 22a (22b), which is movable accommodated in a valve housing 20a' (20b').
  • the piston element 22a (22b) and the valve housing 20a' (20b') define a cylinder chamber 23a (23b) which is filled with a hydraulic medium. Due to the hydraulic interconnection between both cylinder chambers 23a and 23b via the interconnecting hydraulic line 24, no volume difference between both discharge valves will occur during the simultaneous switching of both discharge valves 20a and 20b from their open and closed position.
  • the pre-compression stroke is fully completed at the moment the ramp up - ramp down action is initiated and the sum of the hydraulic medium flows of both cylinders is always 100%.
  • FIG 2a the hydraulic line 24 interconnects both valve housings 20a' and 20b' (cylinder chambers 23a and 23b) of the discharge valves 20a and 20b on the piston side thereof at the side of the piston elements 22a (22b).
  • Figure 2b another embodiment of a pump system is shown. The embodiment of Figure 2b is largely identical to the embodiment of the pump system disclosed in Figure 2a and described above and also its operation is identical.
  • reference numeral 24' depicts a hydraulic line, similar to the hydraulic line 24 of Figure 2a , which interconnects both valve housings 20a' and 20b' of the discharge valves 20a and 20b on the cylinder side thereof at the side of the piston rods 22a'-22b' opposite to the side of the piston elements 22a (22b).
  • valve housings 20a' and 20b' By interconnecting both valve housings 20a' and 20b' via the interconnecting hydraulic line 24-24', these small volume and pressure pulsations are no longer present as the displaced volume of one discharge valve is compensated by the same volume change created by the other discharge valve.
  • each discharge valve 20a (20b) is provided with sensors 25a-26a (25b-26b) which detect the extreme positions of the piston elements 22a (22b) within the cylinder chamber 23a (23b) when in fully closed or fully open position.
  • the sensor 25a (25b) will generate a signal when the valve body 21a (21b) is completely closing their respective discharge outlet 15a (15b) as the sensor 25a (25b) will properly detect the position of the piston element 22a (22b) in that extreme closing position.
  • sensor 26a (26b) will detect the piston element 22a (22b) in its other extreme position, meaning that the discharge valve 20a (20b) is fully open.
  • the control mechanisms of both of the discharge valves 20a-20b are interconnected.
  • Sensor 25a (which detects the fully closed position of the discharge valve 20a) is interconnected with the sensor 26b (which detects the fully open position of the discharge valve 20b) and likewise sensor 25b (which detects the fully closed position of the discharge valve 20b) is interconnected with the sensor 26a (which detects the fully open position of the discharge valve 20a).
  • the opening of say the hydraulic valve 20b (starting from the situation in Figure 2 ) will be detected by the sensor 25b and will simultaneously also be detected by sensor 26a as the discharge valve 20a is being moved towards its closed position.
  • the simultaneous actuation of the sensor 26b and 25a will trigger the fully open position of the discharge valve 20b and the fully closed position of the discharge valve 20a. Any deviation of the simultaneous actuation of both sensor pairs 25a-26b and 25b-26a will be a signal that a change in the volume occupied by the hydraulic medium in the cylinder chambers 23a and 23b and the hydraulic line 24-24' has occurred.
  • valve 29 Any shortage of hydraulic medium can be supplied via the valve 29 and interconnecting line 24 (24'). Likewise any surplus of hydraulic medium can be removed interconnecting line 24 (24') and valve 29.
  • lever assembly 240 comprises a lever 240 having two ends, each end being hingely connected with either piston element 22a (22b) of one of said piston/cylinder driven valves 20a-20b.
  • lever assembly 240 comprises two sub-lever elements 230a-230b, each connected to their respective piston element 22a-22b as well as with either end of the lever 240.
  • each connection is a hinge connection.
  • the lever 240 is hingely connected at its mid point 241a with the solid world.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP16718503.2A 2015-03-09 2016-03-03 Hydraulic pump system for handling a slurry medium Active EP3268607B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2015900822A AU2015900822A0 (en) 2015-03-09 Hydraulic pump system for handling a slurry medium
PCT/NL2016/050147 WO2016144161A1 (en) 2015-03-09 2016-03-03 Hydraulic pump system for handling a slurry medium

Publications (2)

Publication Number Publication Date
EP3268607A1 EP3268607A1 (en) 2018-01-17
EP3268607B1 true EP3268607B1 (en) 2020-10-28

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ID=55808818

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Application Number Title Priority Date Filing Date
EP16718503.2A Active EP3268607B1 (en) 2015-03-09 2016-03-03 Hydraulic pump system for handling a slurry medium

Country Status (8)

Country Link
EP (1) EP3268607B1 (zh)
JP (1) JP6701216B2 (zh)
CN (1) CN107407266B (zh)
AU (2) AU2016229643B2 (zh)
BR (1) BR112017019112B1 (zh)
CA (1) CA2977442C (zh)
WO (1) WO2016144161A1 (zh)
ZA (1) ZA201705784B (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2019357B1 (en) * 2017-07-27 2019-02-18 Weir Minerals Netherlands Bv Pump system for handling a slurry medium
FR3097010B1 (fr) 2019-06-07 2021-06-11 Continental Automotive Gmbh Procédé de validation d’une disparition de défaillance transitoire du signal issu d’un capteur de vilebrequin

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177016A (en) * 1978-04-17 1979-12-04 Bechtel International Corporation Self cleaning manifold connection for slurry pump
KR100281932B1 (ko) * 1998-10-10 2001-09-22 양재신 드라이브 실린더 유압장치
CN2578548Y (zh) * 2002-10-15 2003-10-08 吴利文 液压往复式泥浆泵
JP4335543B2 (ja) * 2003-01-27 2009-09-30 東京都 往復動複列型容積ポンプ
WO2005003559A1 (de) * 2003-07-02 2005-01-13 Gerhard Winiger Kolbenpumpe
DE102006015845B3 (de) * 2006-04-03 2007-07-05 Hofmann Gmbh Maschinenfabrik Und Vertrieb Verfahren zum Betreiben einer oszillierenden Verdrängerpumpe und oszillierende Verdrängerpumpe
EP2107241A3 (en) * 2008-04-02 2010-06-09 Flux Instruments AG A Piston Pump Having a Force Sensor and a Method for Controlling Said Pump
AU2011239051B2 (en) 2010-04-07 2015-12-24 Weir Minerals Netherlands B.V. Phase shift controller for a reciprocating pump system.
CN201661435U (zh) * 2010-04-16 2010-12-01 杨双元 自吸式液压水泥砂浆泵
CN103423139B (zh) * 2012-05-23 2016-04-27 中联重科股份有限公司 泵送机构及其控制方法以及混凝土泵送设备

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CA2977442A1 (en) 2016-09-15
JP6701216B2 (ja) 2020-05-27
BR112017019112A2 (pt) 2018-04-24
BR112017019112B1 (pt) 2023-02-14
AU2016229643A1 (en) 2017-09-07
AU2016229643B2 (en) 2020-10-01
WO2016144161A1 (en) 2016-09-15
CN107407266A (zh) 2017-11-28
EP3268607A1 (en) 2018-01-17
ZA201705784B (en) 2020-11-25
JP2018507979A (ja) 2018-03-22
CN107407266B (zh) 2021-06-08
CA2977442C (en) 2021-10-26
AU2020294221A1 (en) 2021-01-28

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