WO2013045592A2 - Piston pump and piston assembly therefor - Google Patents
Piston pump and piston assembly therefor Download PDFInfo
- Publication number
- WO2013045592A2 WO2013045592A2 PCT/EP2012/069151 EP2012069151W WO2013045592A2 WO 2013045592 A2 WO2013045592 A2 WO 2013045592A2 EP 2012069151 W EP2012069151 W EP 2012069151W WO 2013045592 A2 WO2013045592 A2 WO 2013045592A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal
- pump
- piston
- piston assembly
- axis
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
-
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
Definitions
- the present invention relates principally to a piston pump and in particular to a piston assembly for such a pump.
- Embodiments of the invention provide a piston pump and piston assembly which address the problems mentioned above. Summary of the Invention
- a piston pump including: a cylinder having an inner wall surface formed around an axis of the cylinder; and a piston assembly for sliding along said cylinder axis, said piston assembly including a slideable flexible seal in generally sealing contact with said inner wall surface, and a seal mounting, said seal mounting having a plurality of circumferentially arranged members moveable radially of said axis to increase or decrease the size of the seal.
- said plurality of members each include a surface which collectively provide a conical formation and the piston assembly further includes an adjuster moveable along the axis thereby to act on the conical formation to cause said increase or decrease in size of the seal.
- the conical formation is male and the adjuster is female, and preferably, the piston further includes a rocker about which the members may pivot in use.
- the rocker has a stem for driving the piston, and the adjuster is mounted on the rocker at said stem.
- the plurality of members forming the seal mounting are resiliently attached together.
- the seal has a generally flat end supported by ends of the plurality of members.
- a piston assembly for sliding along a cylinder axis, said piston assembly including a slideable flexible seal for generally sealing contact with the cylinder wall surface, and a seal mounting, said seal mounting having a plurality of circumferentially arranged members moveable radially of said axis to increase or decrease the size of the seal.
- the piston assembly includes any one or more features of the first aspect.
- a piston seal when used in the pump of the first aspect, or the with the piston assembly of the second aspect.
- chromatography apparatus employing a pump according to the first aspect.
- FIG. 1 shows a piston pump 10.
- the pump includes a cylinder 20 which has an axis A, and a piston assembly 30.
- the piston can slide in the cylinder along axis A in the direction of the arrows B, in use, driven by a motor (not shown) or the like, connected to a stem 32 of the piston assembly 30.
- This motion provides pressure changes (including suction) at the head space 24 of the cylinder, which in turn can cause fluid flow into (or out of) bio-chemical apparatus, in this case chromatography apparatus 50.
- the piston assembly 30 has a flexible elastomeric seal 34 which seals and slides against an inner wall surface 22 of the cylinder.
- This seal has a flat leading face 36 which extends across the whole of the head space 24. This arrangement reduces the dead space when the piston reaches the end of its stroke.
- the flexible seal 34 is able to maintain its flat face 34 because it is supported by a seal mounting 44.
- the seal mounting 44 is formed from a plurality of resilient, or resiliently connected members 37, arranged circumferentially about the axis A, like the fingers of a machine tool collet. 12 members are envisaged, but more or less members will be adequate.
- the members of the mounting 44 are supported on a rocker 38 which is located at the end of the stem 32.
- the rocker acts as a pivot for each member at a pivot point 31 .
- the members extend beyond the pivot point 31 and at the ends distal from the seal, taper toward the axis A, together forming a male conical formation 33.
- the piston assembly includes also an adjuster 35, having a threaded portion 39 which engages with a threads 40 formed on the stem 32.
- the adjuster includes also a female conical formation 42 which engages with the male conical formation 33 formed by the members.
- the this force is adjustable by means of rotating the adjuster 35, to cause its movement on the threads 40, and movement relative to the stem 32 and rocker 38.
- Moving the adjuster toward the rocker 38 causes the conical formations to engage, and the upper ends of the members 37 to be forced in the direction of arrows C.
- the members 37 pivot about pivot point 31 and move radially outwardly at the seal 34 in the direction of arrows D. Opposite movements are generated when the adjuster is moved away from the rocker 38.
- the cylinder and seal will be generally circular in cross section, although other shapes are possible.
- metals and plastics materials will be employed for the cylinder and piston assembly, but other materials such as ceramic materials could be employed, for example where corrosive or invasive liquids need to be pumped.
- the seal material may be any flexible elastomeric material including polymers such as natural rubber, EPDM, Neoprene, Silicone, Urethane, Ethylene Propylene (EP) or the like, or combinations of said polymers.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details Of Reciprocating Pumps (AREA)
- Sealing Devices (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/344,713 US20140338527A1 (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly therefor |
JP2014532395A JP2014532139A (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly thereof |
CA2850056A CA2850056A1 (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly therefor |
CN201280047754.1A CN103827493A (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly therefor |
EP12766962.0A EP2761183A2 (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly therefor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB1116907.5A GB201116907D0 (en) | 2011-09-30 | 2011-09-30 | Piston pump and piston assembly therefor |
GB1116907.5 | 2011-09-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2013045592A2 true WO2013045592A2 (en) | 2013-04-04 |
WO2013045592A3 WO2013045592A3 (en) | 2014-01-03 |
Family
ID=45034968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2012/069151 WO2013045592A2 (en) | 2011-09-30 | 2012-09-27 | Piston pump and piston assembly therefor |
Country Status (7)
Country | Link |
---|---|
US (1) | US20140338527A1 (en) |
EP (1) | EP2761183A2 (en) |
JP (1) | JP2014532139A (en) |
CN (1) | CN103827493A (en) |
CA (1) | CA2850056A1 (en) |
GB (1) | GB201116907D0 (en) |
WO (1) | WO2013045592A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3138597A1 (en) * | 2015-09-03 | 2017-03-08 | F. Hoffmann-La Roche AG | Dosing unit with low radial sealing forces during storage |
CN110966480A (en) * | 2019-12-30 | 2020-04-07 | 武昌船舶重工集团有限公司 | Sealing device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US854672A (en) * | 1906-09-17 | 1907-05-21 | Charles B Shepard | Packing. |
US1338906A (en) * | 1919-07-29 | 1920-05-04 | William J Coulson | Pump-piston |
US1611449A (en) * | 1926-01-09 | 1926-12-21 | Granville A Humason | Pump |
GB638164A (en) * | 1947-04-25 | 1950-05-31 | Jean Alfred Troendle | Improvements relating to fluid-tight packing means |
US4317408A (en) * | 1978-06-22 | 1982-03-02 | Fmc Corporation | Wear resistant pump packing cup |
US4804290A (en) * | 1986-08-22 | 1989-02-14 | Peter J. Balsells | Latching and sealing device |
US5671928A (en) * | 1995-12-29 | 1997-09-30 | Millipore Investment Holdings Limited | Seal for chromatography column having ridges |
US6904784B2 (en) * | 2001-02-27 | 2005-06-14 | Teledyne Isco, Inc. | Liquid chromatographic method and system |
ITPC20040022A1 (en) * | 2004-05-26 | 2004-08-26 | Carlo Crespi | PISTON FOR DOSING EQUIPMENT IN PARTICULAR FOR THE FOOD AND / OR PHARMACEUTICAL SECTOR, WITH IMPROVED SEALING SYSTEMS |
DE102007047419A1 (en) * | 2007-10-04 | 2009-04-09 | Robert Bosch Gmbh | Piston pump for conveying a fluid and associated brake system |
CN101737316A (en) * | 2010-01-25 | 2010-06-16 | 大连三洋压缩机有限公司 | Piston with compound piston ring |
-
2011
- 2011-09-30 GB GBGB1116907.5A patent/GB201116907D0/en not_active Ceased
-
2012
- 2012-09-27 JP JP2014532395A patent/JP2014532139A/en active Pending
- 2012-09-27 WO PCT/EP2012/069151 patent/WO2013045592A2/en active Application Filing
- 2012-09-27 US US14/344,713 patent/US20140338527A1/en not_active Abandoned
- 2012-09-27 CN CN201280047754.1A patent/CN103827493A/en active Pending
- 2012-09-27 CA CA2850056A patent/CA2850056A1/en not_active Abandoned
- 2012-09-27 EP EP12766962.0A patent/EP2761183A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
None |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3138597A1 (en) * | 2015-09-03 | 2017-03-08 | F. Hoffmann-La Roche AG | Dosing unit with low radial sealing forces during storage |
WO2017036965A1 (en) * | 2015-09-03 | 2017-03-09 | Roche Diabetes Care Gmbh | Dosing unit with low radial sealing forces during storage |
US10980937B2 (en) | 2015-09-03 | 2021-04-20 | Roche Diabetes Care, Inc. | Dosing unit for use in ambulatory infusion systems |
CN110966480A (en) * | 2019-12-30 | 2020-04-07 | 武昌船舶重工集团有限公司 | Sealing device |
Also Published As
Publication number | Publication date |
---|---|
CA2850056A1 (en) | 2013-04-04 |
WO2013045592A3 (en) | 2014-01-03 |
GB201116907D0 (en) | 2011-11-16 |
US20140338527A1 (en) | 2014-11-20 |
CN103827493A (en) | 2014-05-28 |
JP2014532139A (en) | 2014-12-04 |
EP2761183A2 (en) | 2014-08-06 |
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