US3926095A - Piston pump - Google Patents

Piston pump Download PDF

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Publication number
US3926095A
US3926095A US469455A US46945574A US3926095A US 3926095 A US3926095 A US 3926095A US 469455 A US469455 A US 469455A US 46945574 A US46945574 A US 46945574A US 3926095 A US3926095 A US 3926095A
Authority
US
United States
Prior art keywords
piston
cylinder
annular groove
pump
decompression chamber
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.)
Expired - Lifetime
Application number
US469455A
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English (en)
Inventor
Dieter Weigle
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.)
Wepuko Pahnke GmbH
Original Assignee
Wepuko Pahnke 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 Wepuko Pahnke GmbH filed Critical Wepuko Pahnke GmbH
Application granted granted Critical
Publication of US3926095A publication Critical patent/US3926095A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F04B1/0408—Pistons

Definitions

  • a channel leads from the radial inner bottom surface of the annular groove to a decompression
  • the present invention relates to a piston pump having at least one piston reciprocally mounted in a piston cylinder and being provided with at least one piston ring, the outer peripheral surface of which slidingly contacts the wall surfaces of the cylinder.
  • the piston ring is mounted in an annular groove, the bottom of which is in communication ⁇ -with -a decompression chamber via a channel.
  • the piston is thus hydraulically balanced.
  • radial piston pumpsaswell'as axial piston pumps have slip shoes, cross-headsor pump plates of the pump piston directly hydraulically balanced on the support surfaces by means of a decompression chamber which is filled with hydraulic fluid.
  • decompression chambers generally were connected with the pressure chambers of the pertinent pump cylinders via channels extending and leading to the piston and thereto connected guide members of the piston.
  • an object of the present invention to provide an arrangement wherein the aforedescribed drawbacks occurring in the communication channels from the decompression chamber are avoided. It is a more specific object of the invention to provide an ar rangement wherein the clogging of the communication channels due to solid deposits is avoided even with increased working time of the pump and corresponding wear of the movable parts to the pump.
  • the hydraulic fluid which penetrates into the communication channel must traverse not only the annular space between the piston and cylinder wall surfaces but also the annular space between the piston ring and the 2 annular groove in which the'pisfon'ring is mounted.
  • the gap between the inner radial side of the piston ring and the bottom of the- 'annuIar groove in which the piston ring is mounted remains for, all practical purposes constant during the life of the pump.
  • the wear of the piston rings occurs on the outer radial side and not on the inner radial side which faces the bottom of the annular groove. Therefore, the filtering effect does'not change which is effected by the piston ring on the hydraulic fluid which exits from the mouth at the bottom of the piston ring groove.
  • the piston ring of course u ndergoes constant motion .during thev operation of the pump which brings about a self-cleaning action in the annular groove of the piston ring so that a free flow of the hydraulic fluid from the mouthof thecommunication channel is always present.
  • the aforedescribed arrangement is also advantageous from a constructional point of view, because the special groove for collecting leaking fluid that must be present at the mouth of the communication channel when said mouth is joined at the outer periphery of the piston, can be dispensed with.
  • FIGURE of the drawing constitutes a cross-sectional diagrammatic view in longitudinal sec tion of a piston of a radial piston pump.
  • FIGURE of the drawing illustrates a portion of a cylinder head 10 of a radial piston pump wherein there is a cylindrical bore 11.
  • a piston 12 is reciprocally mounted in the cylindrical bore 11.
  • the piston 12 is provided with two piston rings 13 and 14 which slide along the cylindrical wall surface of the bore 11. Both piston rings 13 and 14 are mounted with play in a known manner in the exterior annular grooves 15 and 16 of the piston 12.
  • the piston has a spherically shaped head portion 17 which is movable within a mating spherical bushing of a sliding block 18.
  • the sliding block 18 bears against a slide boss 19.
  • This decompression chamber 21 has a suitably sized cross-section and is in communication with a central communication channel 23 in the piston 12 via a communication channel 22 in the slide block 18.
  • the central communication channel 23 of the piston 12 communicates with a transverse channel 24 which ends into two diametrically opposite mouths located at the bottom of the annular groove 16 of the piston 12 in which the piston ring 14 is loosely mounted.
  • fluid may flow from the cylinder 11 through the annular gap 25 between the outer periphery of the piston 12 and the inner cylindrical wall surface of the bore 11, through the annular gap 26 between the piston ring 14 and the annular groove 16, through the transverse channel 24 and into the longitudinal central channel 23 of the piston 12 and then through the communication channel 22 in the slide block 11 and finally into the decompression chamber 21, wherein a hydraulic pressure release of the piston is effected.
  • the annular spaces 25 and 26 carry out the aforementioned filtering effect.
  • a high-pressure piston pump having a cylinder, a piston supported for reciprocation within the cylinder, a decompression chamber, means associated with the piston and in communication with the cylinder for defining a fluid throttling region, and means disposed in the piston and including a radial passage therethrough 4 for providing communication between the fluid throttling region and the decompression chamber, the improvement wherein the outer peripheral surface of the piston is provided with an annular groove aligned and communicating with the radial passage, and wherein the fluid throttling region defining means comprises a piston ring disposed loosely in the annular groove and extending outwardly thereof to a position adjacent the cylinder wall, the axial gap defined between one face of the piston and the adjacent side wall of the annular groove defining a self-wiping fluid throttling region that communicates with the radial gap between the outer peripheral surface of the adjacent forward portion of the piston and the surrounding cylinder wall.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US469455A 1973-05-18 1974-05-13 Piston pump Expired - Lifetime US3926095A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2325242A DE2325242B1 (de) 1973-05-18 1973-05-18 Einrichtung zur Versorgung des hydrostatischen Lagers eines Kolbens einer hydrostatischen Kolbenpumpe

Publications (1)

Publication Number Publication Date
US3926095A true US3926095A (en) 1975-12-16

Family

ID=5881361

Family Applications (1)

Application Number Title Priority Date Filing Date
US469455A Expired - Lifetime US3926095A (en) 1973-05-18 1974-05-13 Piston pump

Country Status (5)

Country Link
US (1) US3926095A (it)
JP (1) JPS5420003B2 (it)
DE (1) DE2325242B1 (it)
GB (1) GB1453690A (it)
IT (1) IT1014203B (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669369A (en) * 1984-01-12 1987-06-02 Ae Plc Piston and piston ring assemblies
EP3109468A1 (en) * 2015-06-26 2016-12-28 Danfoss A/S Hydraulic machine
US10288051B2 (en) 2015-06-26 2019-05-14 Danfoss A/S Hydraulic machine arrangement
US10352322B2 (en) 2015-06-26 2019-07-16 Danfoss A/S Vane cell machine with centric bore in ring insert in side wall
CN114929305A (zh) * 2019-12-23 2022-08-19 阿西斯特医药系统公司 流体输送系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10017780B4 (de) * 2000-04-10 2005-12-15 Brueninghaus Hydromatik Gmbh Kolbenmaschine
CN103582693A (zh) 2011-06-03 2014-02-12 格雷特波因特能源公司 碳质原料的加氢甲烷化

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1523572A (en) * 1923-07-16 1925-01-20 Agard Palmer Piston and ring
US1528817A (en) * 1924-08-18 1925-03-10 Dinnes John Piston
US3053197A (en) * 1959-12-24 1962-09-11 United Aircraft Corp Axial piston pump with balanced drive plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1523572A (en) * 1923-07-16 1925-01-20 Agard Palmer Piston and ring
US1528817A (en) * 1924-08-18 1925-03-10 Dinnes John Piston
US3053197A (en) * 1959-12-24 1962-09-11 United Aircraft Corp Axial piston pump with balanced drive plate

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669369A (en) * 1984-01-12 1987-06-02 Ae Plc Piston and piston ring assemblies
EP3109468A1 (en) * 2015-06-26 2016-12-28 Danfoss A/S Hydraulic machine
US10288051B2 (en) 2015-06-26 2019-05-14 Danfoss A/S Hydraulic machine arrangement
US10352322B2 (en) 2015-06-26 2019-07-16 Danfoss A/S Vane cell machine with centric bore in ring insert in side wall
US10711780B2 (en) 2015-06-26 2020-07-14 Danfoss A/S Hydraulic machine
CN114929305A (zh) * 2019-12-23 2022-08-19 阿西斯特医药系统公司 流体输送系统
CN114929305B (zh) * 2019-12-23 2024-03-15 阿西斯特医药系统公司 流体输送系统

Also Published As

Publication number Publication date
IT1014203B (it) 1977-04-20
JPS5420003B2 (it) 1979-07-19
GB1453690A (en) 1976-10-27
DE2325242B1 (de) 1974-10-03
JPS5042404A (it) 1975-04-17

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