US20050214139A1 - Liquid delivery pump for liquid chromatograph - Google Patents

Liquid delivery pump for liquid chromatograph Download PDF

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Publication number
US20050214139A1
US20050214139A1 US11/071,180 US7118005A US2005214139A1 US 20050214139 A1 US20050214139 A1 US 20050214139A1 US 7118005 A US7118005 A US 7118005A US 2005214139 A1 US2005214139 A1 US 2005214139A1
Authority
US
United States
Prior art keywords
plunger
crosshead
liquid
pump
ball
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.)
Abandoned
Application number
US11/071,180
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English (en)
Inventor
Yoshiaki Aso
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.)
SHIMAZDU Corp
Shimadzu Corp
Original Assignee
Shimadzu Corp
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 Shimadzu Corp filed Critical Shimadzu Corp
Assigned to SHIMAZDU CORPORATION reassignment SHIMAZDU CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASO, YOSHIAKI
Publication of US20050214139A1 publication Critical patent/US20050214139A1/en
Abandoned 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
    • 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
    • F04B53/144—Adaptation of piston-rods
    • F04B53/147—Mounting or detaching of piston rod

Definitions

  • the present invention relates to a liquid delivery pump for a liquid chromatograph, and more specifically, relates to a structure for holding a plunger moving reciprocally within a pump room.
  • FIG. 2 is a sectional view of a conventional liquid delivery pump for a liquid chromatograph.
  • reference numeral 1 is a pump head
  • reference numeral 2 is a plunger
  • reference numeral 3 is a sealing material for allowing the plunger 2 to slide while preventing leak
  • reference numeral 4 is a pump room formed within the pump head 1
  • reference numerals 5 and 6 are inlet and outlet for liquid to be delivered, respectively, and having check valves 5 a and 5 b
  • reference numeral 7 is a pump body
  • reference numeral 8 is a bearing
  • reference numeral 9 is a spring
  • reference numeral 10 is a crosshead
  • reference numeral 11 is a cam rotationally driven by a motor not shown in the figure
  • reference numeral 12 is a cam follower that rolls along the circumference of the cam 11 .
  • a tip side (left side in FIG. 2 ) of the plunger 2 is inserted into the pump room 4 through the sealing material 3 , and a base side (right side in FIG. 2 ) thereof is connected to the crosshead 10 .
  • the crosshead 10 axially supported by the bearing 8 moves reciprocally within the tubular pump body 7 with force imparted by the rotating cam 11 via the cam follower 12 in a forward direction (toward the left side in FIG. 2 ) and force imparted by the spring 9 in a retreating direction (toward the right side in FIG. 2 ).
  • the plunger 2 moves reciprocally within the pump room 4 accompanying with the movement of the crosshead 10 . Accordingly, the pump room 4 is alternately pressurized and depressurized, and associated operations of the check valves 5 a and 6 a cause liquid to flow from the inlet 5 to the outlet 6 , thereby delivering liquid.
  • the plunger 2 A is formed of a material with high hardness, and good wear and chemical resistance such as sapphire.
  • a metal having a surface coated with a ceramic film may be used (for example, see Patent Reference 1 ).
  • FIG. 3 illustrates a connecting structure between the plunger 2 and the crosshead 10 in more detail.
  • Reference numeral 15 is a plunger holder.
  • One end of the plunger holder 15 is fixed to the base side of the plunger 2 , and the other end thereof is machined to form a spherical end 15 a .
  • the plunger holder 15 is fixed to the crosshead 10 with a screw cap 16 , so that the plunger 2 and the crosshead 10 are connected.
  • the spherical end 15 a of the plunger 2 abuts against a flat end face 10 a of the crosshead 10 with point contact.
  • the plunger 2 freely rotates while moving reciprocally along the crosshead 10 .
  • Patent reference 1 Japanese Patent Publication (Kokai) NO.
  • an object of the present invention is to provide a liquid delivery pump for a liquid chromatograph with production and maintenance costs lower than those of the conventional device.
  • a plunger holder is formed in a ball, and a plunger is connected to the plunger holder with a screw.
  • a liquid delivery pump comprises a crosshead moving reciprocally accompanied with a rotational movement of a cam, and a plunger having a tip portion inserted into a pump room via a sealing material and a base portion connected to the crosshead so as to rotate freely.
  • the ball abuts against a flat end surface of the crosshead at a connection section between the crosshead and the plunger, and the base portion of the plunger is screwed in the ball.
  • FIG. 1 is a schematic view showing a liquid delivery pump according to an embodiment of the present invention
  • FIG. 2 is a schematic view showing a conventional liquid delivery pump
  • FIG. 3 is a detailed view showing the conventional liquid delivery pump.
  • FIG. 1 is a schematic view showing a liquid delivery pump according to an embodiment of the present invention.
  • FIG. 1 corresponds to FIG. 3 , and an overall structure of the liquid delivery pump is substantially the same as that shown in FIG. 2 .
  • the same reference numerals are used for elements functionally same as those in FIG. 3 , and descriptions thereof are omitted.
  • a difference from the conventional pump is that a plunger holder 15 is formed in a ball.
  • Manufacturing technology for a ball with a high degree of sphericity has been established in the field of bearings, and it is possible to produce balls at relatively low cost and high-quality.
  • Such a ball thus manufactured or obtained is provided with a screw hole 15 b for screwing a female screw to form the plunger holder 15 .
  • the plunger 2 is provided with a male screw 2 a at a base portion thereof, so that the male screw 2 a is screwed into the screw hole 15 b .
  • the plunger 2 and the plunger holder 15 are connected.
  • an operation of the pump constructed as described above is basically the same as the conventional pump shown in FIG. 3 .
  • a surface (spherical surface) of the plunger holder 15 abuts against a flat end surface 10 a of the crosshead 10 , so that the plunger 2 rotates freely.
  • the spherical body with a high degree of sphericity for example, a ball bearing
  • the plunger holder 15 is used as the plunger holder 15 , so that the plunger 2 moves smoothly and slides without grinding against the sealing material 3 shown in FIG. 2 , even when the sealing material 3 is slightly off-centered or deformed. As a result, it is possible to reduce wear of the plunger 2 and the sealing material 3 .
  • the plunger 2 is screwed in the plunger holder 15 , so that it is easy to replace the plunger 2 when it is worn out. It is necessary to replace only the plunger 2 , thereby reducing replacement cost as compared with the conventional pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US11/071,180 2004-03-25 2005-03-04 Liquid delivery pump for liquid chromatograph Abandoned US20050214139A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004088924A JP4086001B2 (ja) 2004-03-25 2004-03-25 液体クロマトグラフ用送液ポンプ
JP2004-088924 2004-03-25

Publications (1)

Publication Number Publication Date
US20050214139A1 true US20050214139A1 (en) 2005-09-29

Family

ID=34990054

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/071,180 Abandoned US20050214139A1 (en) 2004-03-25 2005-03-04 Liquid delivery pump for liquid chromatograph

Country Status (3)

Country Link
US (1) US20050214139A1 (zh)
JP (1) JP4086001B2 (zh)
CN (1) CN1317558C (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090104083A1 (en) * 2007-10-23 2009-04-23 Shimadzu Corporation Check valve, infusion device using the same, and method of manufacturing the same
US20110192277A1 (en) * 2010-02-08 2011-08-11 Masanori Fujiwara Cam mechanism and liquid sending pump having same
WO2015150908A1 (de) * 2014-04-02 2015-10-08 Agilent Technologies, Inc. Fluidpumpe mit lager mit seitlich kompaktem vermittlungskörper mit zwei gegenüberliegenden konvexen koppelkappen
US10955431B2 (en) * 2017-08-30 2021-03-23 Hitachi High-Tech Corporation Automatic analysis device with syringe pump
US11920582B2 (en) 2019-12-27 2024-03-05 Kyocera Corporation Plunger, pump, and liquid analysis device

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007292011A (ja) * 2006-04-27 2007-11-08 Shimadzu Corp 送液ポンプ及びその送液ポンプを用いた液体クロマトグラフ
JP4972613B2 (ja) * 2008-07-02 2012-07-11 株式会社日立ハイテクノロジーズ 送液装置および液体クロマトグラフ
KR101000853B1 (ko) 2008-10-24 2010-12-14 홍도의 고압 플런저 펌프
CN102052275B (zh) * 2009-10-30 2012-10-10 北京普析通用仪器有限责任公司 并联液相色谱泵
CN102312812A (zh) * 2010-06-29 2012-01-11 株式会社岛津制作所 供液泵
JP5370310B2 (ja) * 2010-08-03 2013-12-18 株式会社島津製作所 送液ポンプ
CN102155378B (zh) * 2011-03-17 2012-12-05 芜湖天乐分析仪器有限公司 一种液相色谱仪的高压恒流泵
JP6227308B2 (ja) * 2013-07-12 2017-11-08 三菱重工業株式会社 回転機械
CN105223298B (zh) * 2014-06-20 2019-01-08 苏州普源精电科技有限公司 一种具有柱塞结构的液相色谱仪
KR101887550B1 (ko) * 2017-03-13 2018-09-06 비씨태창산업(유) 고압 플런저 펌프
CN107387400B (zh) * 2017-08-08 2020-08-21 江苏同济分析仪器有限公司 一种液相色谱仪高压输液泵的柱塞机构的装配方法
RU178551U1 (ru) * 2017-12-04 2018-04-06 Акционерное общество "Научно-исследовательский институт Приборостроения имени В.В. Тихомирова" Волноводная нагрузка
JP6993303B2 (ja) * 2018-07-26 2022-01-13 京セラ株式会社 プランジャ、ポンプ、および液体分析装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736049B2 (en) * 2000-12-11 2004-05-18 Gilson, Inc. High pressure low volume pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2178285Y (zh) * 1993-12-11 1994-09-28 江汉大学 往复式螺旋双柱塞泵
JPH09292381A (ja) * 1996-04-26 1997-11-11 Shimadzu Corp 送液ポンプ
JPH09318611A (ja) * 1996-05-28 1997-12-12 Shimadzu Corp 液体クロマトグラフ用送液ポンプ
JP3988275B2 (ja) * 1998-09-29 2007-10-10 株式会社島津製作所 送液ポンプ
CN1152256C (zh) * 2001-04-06 2004-06-02 中国科学院大连化学物理研究所 电渗流驱动高压输液泵
CN1207568C (zh) * 2002-06-03 2005-06-22 复旦大学 一种热膨胀微流高压梯度泵及其使用方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736049B2 (en) * 2000-12-11 2004-05-18 Gilson, Inc. High pressure low volume pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090104083A1 (en) * 2007-10-23 2009-04-23 Shimadzu Corporation Check valve, infusion device using the same, and method of manufacturing the same
US8382454B2 (en) * 2007-10-23 2013-02-26 Shimadzu Corporation Check valve, infusion device using the same, and method of manufacturing the same
US20110192277A1 (en) * 2010-02-08 2011-08-11 Masanori Fujiwara Cam mechanism and liquid sending pump having same
US8863644B2 (en) 2010-02-08 2014-10-21 Shimadzu Corporation Cam mechanism and liquid sending pump having same
WO2015150908A1 (de) * 2014-04-02 2015-10-08 Agilent Technologies, Inc. Fluidpumpe mit lager mit seitlich kompaktem vermittlungskörper mit zwei gegenüberliegenden konvexen koppelkappen
US10955431B2 (en) * 2017-08-30 2021-03-23 Hitachi High-Tech Corporation Automatic analysis device with syringe pump
US11920582B2 (en) 2019-12-27 2024-03-05 Kyocera Corporation Plunger, pump, and liquid analysis device

Also Published As

Publication number Publication date
JP4086001B2 (ja) 2008-05-14
CN1317558C (zh) 2007-05-23
CN1673735A (zh) 2005-09-28
JP2005274391A (ja) 2005-10-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SHIMAZDU CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ASO, YOSHIAKI;REEL/FRAME:016348/0994

Effective date: 20050303

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION