EP2434140A1 - Machine à piston hydraulique - Google Patents

Machine à piston hydraulique Download PDF

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Publication number
EP2434140A1
EP2434140A1 EP11182392A EP11182392A EP2434140A1 EP 2434140 A1 EP2434140 A1 EP 2434140A1 EP 11182392 A EP11182392 A EP 11182392A EP 11182392 A EP11182392 A EP 11182392A EP 2434140 A1 EP2434140 A1 EP 2434140A1
Authority
EP
European Patent Office
Prior art keywords
head
piston
machine
cylindrical seating
cylindrical
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
Application number
EP11182392A
Other languages
German (de)
English (en)
Other versions
EP2434140B1 (fr
Inventor
Fulvio Montipo'
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.)
Interpump Engineering SRL
Original Assignee
Interpump Engineering SRL
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 Interpump Engineering SRL filed Critical Interpump Engineering SRL
Publication of EP2434140A1 publication Critical patent/EP2434140A1/fr
Application granted granted Critical
Publication of EP2434140B1 publication Critical patent/EP2434140B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0428—Supporting and guiding means for the pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/061—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F03C1/0623—Details, component parts
    • F03C1/0626—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0644—Component parts
    • F03C1/0652—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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/143—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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2035—Cylinder barrels
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of 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
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners

Definitions

  • the present invention relates to a hydraulic machine with pistons of a type destined to function as a pump or a motor.
  • An advantageous application of the present invention is in piston hydraulic machines destined to function as high-pressure pumps, which are used in various industrial applications.
  • the lubricating liquid Apart from facilitating drilling by lubricating the drill tool, the lubricating liquid, generally highly viscous and including bentonite-type compounds, also has the task of consolidating the walls of the bore-hole.
  • a hydraulic piston pump comprises a casing destined to rotatably support a rotating shaft and internally of which is arranged a crank thrust mechanism of the crank-shaft type.
  • the crank is associated to the shaft and the con rod to a piston which projects externally of the casing and is slidably associated thereto.
  • the piston is destined to insert internally of a blind cylindrical seating housed in a head which is fixed to the casing, such as to define a variable-volume chamber.
  • An aspiration conduit and a delivery conduit are also housed in the head, which conduits communicate with the cylindrical chamber and are such as to connect, by means of retaining valves, with respective aspirating and delivery manifolds distinct from the head and fixed thereto by means of threaded organs.
  • retaining and guide organs are provided, which substantially snugly insert on the head of the piston.
  • the fluid is aspirated at low pressure through the aspirating conduit, is compressed by the piston moved by the suitably-motorised shaft, and is sent at high pressure through the delivery conduit.
  • the hydraulic piston machines of known type are not, however, free of drawbacks, among which the fact that each time an inspection has to be made, or an extra maintenance intervention on the cylindrical seating and/or the piston becomes necessary, the hydraulic machine has to be shut down, the delivery and aspiration conduits emptied, the connections with the relative circuit manifolds removed, when these too are at least partially emptied, removing the fastening organs of the whole head from the casing and removing the head itself from the piston. Finally, it is also necessary to inversely repeat the above steps in order to complete the re-mounting of the hydraulic machine once the eventual damaged components have been repaired or replaced.
  • An aim of the present invention is to resolve or reduce the above-mentioned drawbacks of the known solutions.
  • a further aim of the present invention is to attain the above-cited objectives with a solution that is simple, rational and relatively economical.
  • the invention provides a hydraulic machine which comprises a casing to which a head is fixed, provided with at least a cylindrical seating destined to house an axially-sliding piston.
  • the cylindrical seating is afforded in a body which is removably associated to the head and is removable in the sliding direction of the piston on the part opposite the casing.
  • This solution enables the inspection and maintenance operations on the cylindrical seating and the internal components thereof to be carried out rapidly.
  • the machine of the invention means that the whole head need not be demounted, with the ensuing above-described problems that operation implies, in order to perform inspections or replacements of components internal of the cylindrical seating.
  • the hydraulic machine comprises seal means interposed between the piston and the cylindrical seating.
  • the seal means advantageously comprise an annular seal associated to the cylindrical seating such as to insert substantially snugly onto the piston.
  • the machine of the invention thus enables rapid and advantageous replacement of the annular seal, which is the component that is most subject to wear in the hydraulic machine, and thus enables conditions of maximum seal and efficiency of the machine to be restored on all occasions.
  • the machine comprises blocking means for axially blocking the seal means in the cylindrical seating.
  • the body the cylindrical seating is afforded in is substantially beaker-formed.
  • the machine also comprises a guide organ of the piston with respect to the cylindrical seating, internally associated to the cylindrical seating itself and destined to insert snugly on the piston.
  • the blocking means and the guide organ coincide.
  • This solution enables optimal alignment of the piston with the cylindrical seating to be obtained, while at the same time, by means of a structural simplification, it enables the seal to be removed together with the bushing when it is to be replaced.
  • the machine comprises at least an aspiration conduit and a delivery conduit realised in the head, the body of the cylindrical seating comprising a pair of through-openings destined to be placed respectively in communication with the aspiration conduit and the delivery conduit.
  • the delivery and aspiration conduit can be compact and housed internally of the head, saving space.
  • the machine comprises fastening means for axially fixing the body of the cylindrical seating to the head.
  • cylindrical seating is stably fixed to the head when the machine is normally in use, as if it were a single piece there-with, while it can be demounted, as above-mentioned, when necessary.
  • the machine comprises a plurality of pistons and a respective plurality of the cylindrical seatings.
  • the above-mentioned fixing means for axially fastening the body of the cylindrical seating to the head advantageously comprise at least a closing cover of the head that is solidly associated to the head by means of first removable connecting means, and solidly associated to the body of each cylindrical seating by means of second removable connecting means.
  • 1 denotes in its entirety a hydraulic piston pump, in the example a high-pressure pump, usable for pressurising an operating fluid to more than 100 bar.
  • the pump 1 comprises a head 10, defining the body of the pump, which is provided with at least a cylindrical seating 20 destined to slidingly house a piston 30.
  • the head 10 is solidly associated to a casing 40 by means of interposing a holed spacer 41.
  • the head 10 is fixed to the casing 40 by means of interposing the spacer 41, by means of fastening screws 42.
  • the cylindrical seating 20, in particular, is afforded in a body 21 which is removably associated to the head 10 and can be removed therefrom in the sliding direction 30 of the piston, on the opposite side with respect to the casing 40.
  • the pump 1 further comprises seal means interposed between the piston 30 and the cylindrical seating 20; the seal means advantageously comprise an annular seal 22, for example made of at least a yielding material.
  • the annular seal 22 is in particular provided with a reinforcing core 23, for example made of metal or another material.
  • the annular seal 22 is associated to the cylindrical seating such as to insert substantially snugly on the head 31 of the piston 30 in order substantially to realise a seal for the operating fluid during the sliding of the piston 30 along the cylindrical seating 20.
  • the body 21 the cylindrical seating it is made in is substantially beaker-formed.
  • the body 21 in which the cylindrical seating 20 is realised is generally defined as a bushing, and it will be thus-termed in the following; the piston 30 is slidably associated internally of the bushing 21.
  • the bushing 21 is inserted snugly in a through-seating 11, also cylindrical, which is realised in the head 10.
  • the bushing 21, the piston 30 and the through-seating 11 are substantially coaxial.
  • the bushing 21 exhibits an external diameter which is slightly smaller than the internal diameter of the through-seating 11, such as to be inserted internally thereof with a small degree of play.
  • the pump 1 advantageously comprises fastening means 50, 54 for axially fixing the bushing 21 to the head 10.
  • the fastening means 50, 54 comprise at least a closing cover 50 of the head 10 solidly associated to the head on the opposite side with respect to the casing 40.
  • first removable connecting means 51 i.e. connecting means that can be removed when so required, for example in order to remove and newly mount the cover 50 itself;
  • first removable connecting means 51 are for example fastening screws.
  • the cover 50 exhibits at least a flat zone 52 destined to function as an abutment and rest for the bottom 24 of the bushing 21, such as to axially block the bushing 21 in the direction of the demounting of the head 10 on an opposite side with respect to the casing 40.
  • cover 50 is solidly associated to the bottom 24 of the bushing 21, by means of second removable connecting means 53, which for example are fastening screws, bayonet-couplings or the like.
  • the pump 1 comprises blocking means destined to axially block the annular seal 22 to the cylindrical seating 20.
  • the pump 1 comprises a guide organ of the piston 30 with respect to the cylindrical seating 20, which is internally associated to the jacket 25 of the bushing 21.
  • the guide organ is destined to snugly insert on the head 31 of the piston 30 such as to guide the sliding of the piston 30 in the cylindrical seating 20; in particular, in the illustrated embodiment the guide organ enables the piston 30 to slide in the sliding direction while staying substantially coaxial to the bushing 21.
  • the guide organ comprises an annular element 60 the internal surface of which is substantially rectified and is such as substantially to snugly insert on the head 31 of the piston 30, while the blocking means comprise a Seeger ring 62 destined to insert in an annular seating 26 afforded in the jacket 25 of the bushing 21 and to axially block the annular element 60.
  • the blocking means and the guide organ coincide and comprise an annular element 60, the internal surface of which is substantially rectified and is such as substantially to insert snugly on the head 31 of the piston 30.
  • annular seating 61 destined to receive an o-ring 63, is afforded on the external surface of the annular element 60.
  • a respective annular seating 26 is further afforded on the jacket 25 of the bushing 21, which annular seating 26 is destined to house the o-ring 63 such that the o-ring prevents reciprocal sliding, in the axial sliding direction, of the annular element 60 and the bushing 21 itself during removal of the bushing 21 from the head 10.
  • the bushing 21 exhibits, at the open end thereof, a broadening of the section forming a step 27 which slides along the whole diameter thereof.
  • the step 27 is such as to restingly receive the annular seal 22.
  • the annular element 60 is such as to define a further abutment for the annular seal 22 on the opposite side of the step 27, such that the seal is axially blocked with respect to the bushing 21.
  • the fastening means 50, 54 further comprise a lock ring 54 solidly associable, for example by friction, to the head 10 on the casing 40 side, such as to exhibit an abutment surface for the bushing 21.
  • the lock ring 54 is such as to axially block the bushing 21 in the removal direction of the head 10 on the same side as the casing 40.
  • the locking ring 54 exhibits an annular flap 55 destined to insert with play internally of the broadening of the bushing 21; the frontal surface of the annular flap 55 rests on the annular element 60, such as to reinforce the axial blocking action thereof in use conditions of the pump itself.
  • the pump 1 further comprises at least an aspiration conduit 12 and a delivery conduit 13, which are directly realised in the head 10. These conduits are such as to be opened and closed respectively by an aspiration valve 14 and a delivery valve 15 which are housed internally of the head 10.
  • the aspiration and delivery valves 14 and 15 are of the retaining type, as known to the technical expert in the sector, and will not be further described in detail.
  • the bushing 21 comprises a pair of through-holes 28, which are realised on the jacket 25 of the bushing 21, in particular in a zone interposed between the step 27 and the bottom 24, which openings are destined, respectively, to be placed in communication with the aspiration conduit 12 and the delivery conduit 13.
  • the two openings 28 are in mutual communication via the compression chamber which is delimited, internally of the bushing 21, by the bottom 24 of the bushing 21, by the top of the piston 30 and, laterally by the jacket 25 of the bushing 21, as well as by the active lip of the annular seal 22 which projects from the bushing 21 and goes to contact the head 31 of the piston 30.
  • the pump 1 comprises three pistons and respectively three cylindrical seatings 20 as described herein above, each of which is in communication, via the respective openings 28, with the aspiration conduit 12 and the delivery conduit 13 realised in the head 10.
  • the closing cover 50 of the head 10 is singly associated to the bottom 24 of each of the bushings 21 by means of respective second removable connecting means 53, independent of one another.
  • each piston 30 is activated in alternating translating motion by a thrust crank mechanism formed by a con rod 32 rotatably associated to the piston and pivoted on a crank 33 constituted by a crankshaft 34.
  • crank shaft 34 is rotatably supported by the casing 40 and is appropriately motorised, as known to an expert in the field.
  • the casing 40 is substantially a closed box-shaped body which is sealedly closed, from which an end of the crank shaft 34 and the head of the pistons 30 project, which piston head 30 is destined to insert in the respective bushing 21 associated to the head 10.
  • the spacer 41 is such as to envelop the intermediate portion between the casing 40 and the head 10.
  • the present invention functions as follows.
  • the operating fluid is transferred by means of the motion of the piston 30 from the aspiration conduit 12 to the delivery conduit 13, without loss or leaks, passing through the compression chamber.
  • the annular element 60 retains the annular seal 22, which therefore remains associated to the bushing and is removed there-with.
EP20110182392 2010-09-28 2011-09-22 Machine à piston hydraulique Active EP2434140B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRE2010A000078A IT1402124B1 (it) 2010-09-28 2010-09-28 Una macchina idraulica a pistoni

Publications (2)

Publication Number Publication Date
EP2434140A1 true EP2434140A1 (fr) 2012-03-28
EP2434140B1 EP2434140B1 (fr) 2014-08-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110182392 Active EP2434140B1 (fr) 2010-09-28 2011-09-22 Machine à piston hydraulique

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EP (1) EP2434140B1 (fr)
IT (1) IT1402124B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600064747A1 (it) * 2016-07-19 2018-01-19 Interpump Group S P A Pompa a pistoni
CN108397381A (zh) * 2018-05-10 2018-08-14 惠州海卓科赛医疗有限公司 一种医疗用柱塞泵及其腔室结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213482A (en) * 1990-09-01 1993-05-25 Alfred Teves Gmbh Hydraulic radial-type piston pump
US5232273A (en) * 1991-03-13 1993-08-03 Robert Bosch Gmbh Brake system pump with a damper chamber with leaf spring and cup closure
US6305265B1 (en) * 1999-06-03 2001-10-23 Bechtel Bwxt Idaho Llc Method and apparatus for pressurizing vaporous fluids
DE10322603A1 (de) * 2003-05-20 2004-12-09 Robert Bosch Gmbh Kolbenpumpe, insbesondere Hochdruck-Kolbenpumpe für Brennkraftmaschinen mit Direkteinspritzung
DE102006006555A1 (de) * 2006-02-13 2007-08-16 Siemens Ag Hochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213482A (en) * 1990-09-01 1993-05-25 Alfred Teves Gmbh Hydraulic radial-type piston pump
US5232273A (en) * 1991-03-13 1993-08-03 Robert Bosch Gmbh Brake system pump with a damper chamber with leaf spring and cup closure
US6305265B1 (en) * 1999-06-03 2001-10-23 Bechtel Bwxt Idaho Llc Method and apparatus for pressurizing vaporous fluids
DE10322603A1 (de) * 2003-05-20 2004-12-09 Robert Bosch Gmbh Kolbenpumpe, insbesondere Hochdruck-Kolbenpumpe für Brennkraftmaschinen mit Direkteinspritzung
DE102006006555A1 (de) * 2006-02-13 2007-08-16 Siemens Ag Hochdruckpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600064747A1 (it) * 2016-07-19 2018-01-19 Interpump Group S P A Pompa a pistoni
CN108397381A (zh) * 2018-05-10 2018-08-14 惠州海卓科赛医疗有限公司 一种医疗用柱塞泵及其腔室结构
CN108397381B (zh) * 2018-05-10 2019-08-27 惠州海卓科赛医疗有限公司 一种医疗用柱塞泵及其腔室结构
WO2019214261A1 (fr) * 2018-05-10 2019-11-14 惠州海卓科赛医疗有限公司 Pompe médicale à piston et structure de cavité associée
US11135372B2 (en) 2018-05-10 2021-10-05 Huizhou Hydro Caresys Medical Co., Ltd. Medical plunger pump and cavity structure thereof

Also Published As

Publication number Publication date
IT1402124B1 (it) 2013-08-28
ITRE20100078A1 (it) 2012-03-29
EP2434140B1 (fr) 2014-08-06

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