US3869225A - Metering apparatus - Google Patents

Metering apparatus Download PDF

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Publication number
US3869225A
US3869225A US265890A US26589072A US3869225A US 3869225 A US3869225 A US 3869225A US 265890 A US265890 A US 265890A US 26589072 A US26589072 A US 26589072A US 3869225 A US3869225 A US 3869225A
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US
United States
Prior art keywords
piston
bore
conduit
flexible member
pump body
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
US265890A
Other languages
English (en)
Inventor
Paul Sommer
Hansjorg Tschirky
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.)
F Hoffmann La Roche AG
Hoffmann La Roche Inc
Original Assignee
F Hoffmann La Roche AG
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 F Hoffmann La Roche AG filed Critical F Hoffmann La Roche AG
Application granted granted Critical
Publication of US3869225A publication Critical patent/US3869225A/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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0203—Burettes, i.e. for withdrawing and redistributing liquids through different conduits
    • B01L3/0206—Burettes, i.e. for withdrawing and redistributing liquids through different conduits of the plunger pump type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0289—Apparatus for withdrawing or distributing predetermined quantities of fluid
    • B01L3/0293—Apparatus for withdrawing or distributing predetermined quantities of fluid for liquids
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members
    • 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
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type

Definitions

  • the invention relates to a metering pump comprising a chemically inert pump body member having a bore formed therein, a delivery piston means operably positioned in said bore, a fluid receiving chamber associated with said pump body member, a portion of said fluid receiving chamber being defined by a wall comprising a part of said pump body member, another portion of said fluid receiving chamber being defined by the inner surface of a flexible member or diaphragm, portions of said flexible member or diaphragm being selectively movable, one end of an inlet conduit means, one end of a connecting conduit means and one end of an outlet conduit means opening into said fluid receiving chamber, the other end of said connecting conduit means being operably associated with said bore, the said flexible member or diaphragm having a first stoppering poriton in one position of the flexible member or diaphragm adapted to overlie said inlet or suction conduit, and
  • the invention in another aspect, relates to a sealing collar or cup seal means disposed around a delivery piston which comprises a fluid-tight housing or casing, a sealing collar or cup seal associated with said housing or casing and in partial contact with said delivery piston, ring means associated with said sealing collar or cup seal to hold the latter in position against said piston, whereby said housing or casing and said sealing collar or cup seal defines a fluid-retaining chamber having an opening in contact with said piston, an inflow conduit and an outflow conduit operably connected to said fluid-retaining chamber.
  • the present invention relates to a metering pump apparatus especially suitable for supplying corrosive medial.
  • the metering pump comprises a pump body member which possesses or defines at least one bore for receiving a delivery piston adapted for reciprocating movement along its vertical axis, at least one independent suction and delivery valve system or means, a crank mechanism or means connected to said piston and adapted with a control member, said crank mechanism with its rotation controls the actuating or operating members of the suction and delivery valve.
  • the suction and delivery valve means is controlled automatically in conjunction with the movement of said piston;
  • the dosage, sampling or metering pumps which generally find use for the measurement of liquids in the microliter region can be employed, for example, for the rapid and precise withdrawal and transfer of liquid specimens for analysis or reagent solutions for analysis.
  • Existing pumps have the disadvantage of having metallic parts which are attacked on contact with corrosive media and, moreover, blockage failures or drag faults occur on transfer.
  • the sealing collars or cup seals on the pumps now used commercially develop leaks with prolonged non-use of the pump due to evaporation of the solvent and the accompanying crystallization.
  • the pump body member is formed or constructed as an integral block of chemically inert material which defines three ducts or conduits, each having an end or opening, preferably in one plane, and the other end or opening respectively, joined to a suction duct or inlet conduit, to a delivery piston bore through a connecting duct or conduit and to a delivery duct or outlet conduit, the three duct ends or conduit openings being covered by a flexible, chemically resistant member or diaphragm which operably joins the ends or openings of the three ducts or conduits and, in the region of the opening of the suction and delivery ducts, can in each case be pressed against the corresponding duct end or opening by an actuating or operating means, at at least actuating or operating means disposed in the region of the suction duct end or opening being firmly connected with the side of the flexible, chemically resistant diaphragm which faces away from the duct end or opening.
  • the pump body can be formed, for example, as a practically square-shaped polytetrafluoroethylene block and can be equipped with a glass piston.
  • the delivery piston is preferably sealed relative to the appropriate or corresponding bore of the pump body member by means of a flexible collar or cup seal which is pressed elasitcally or resiliently thrust against the piston surface, the said collar or cup being disposed in a fluid-tight housing or casing provided with an inlet means and an outlet means and containing a fluid or liquid such as water.
  • the diaphragm or flexible member is constructed of polytetrafluoroethylene and its edge is clamped by a capping attachment or member which possesses a recess in the region or zone of the three duct ends or openings on the surface of the pump body member and two bores for the said actuating members in its upper wall.
  • FIG. 1 is a vertical section of a dosage pump utilizable for measuring analysis samples and reagent solutions
  • FIG. 2 is a vertical section of an embodiment having two feed-pistons which allows for the intake of a liquid with subsequent expulsion and rinsing by means of a second liquid.
  • the metering pump illustrated in FIG. 1, omitting unessential details, comprises a pump body member 1 formed of a square-shaped polytetrafluoroethylene block.
  • a bore 2 defined by the pump body 1, forms the cylinder space for receiving glass piston 3 which is slidably supported therein.
  • the gap existing between delivery piston 3 and the edge of bore 2 is sealed by means of a polytetrafluoroethylene collar or cup seal 4 which is pressed or thrust against the piston surface by elastic O-rings S.
  • a suction line 6 connected to a supply source of the liquid to be drawn in, measured and delivered continues in suction duct or intake conduit 7 extending through the pump body member 1 and then opening at 8 on the upper boundary surface of the pump body member 1.
  • a second duct or connecting conduit 10 which starts from the lower section of the pump piston bore 2 and is connected thereto.
  • a third duct or outlet conduit 12 which is connected to or communicates with delivery line 13.
  • Capping attachment 15 which can be constructed, for example, of brass, acrylic resin or the like, possesses in the middle region of its inner surface turned towards the outer surface of flexible member or diaphragm 14 a recess 16.
  • Glass piston 3 is rigidly connected with piston rod 18, which is slidably guided along its vertical axis in support or bearing 17. On the upper portion of piston rod 18 there is pivoted one end of connecting rod 19. The opposite end of connecting rod 19 is rotatably connected or joined to control disc 20. Control disc 20, fixed rigidly along its horizontal axis to axle or shaft 21 to rotate and be driven uniformly on axle or shaft 21 by a power source means, thereby driving piston 3 by means of connecting rod 19 and piston rod 18.
  • a second actuating or operating rod 26 also projects or extends through capping attachment or member into recess 16, where it rests loosely above the duct end or opening 11 on the fflexible member or diaphragm 14 and presses or thrusts the latter in the operating position drawn against duct end or opening 11.
  • actuating or operating rod 26 is articulately or operably connected or hinged to lever 27 which can be swiveled or pivoted about horizontal shaft 28.
  • a spring 29 acting on lever 27 holds roller 30, rotatably supported on the lever, in constant contact with the specially shaped boundary or circumferential surface of control disc 20.
  • the metering pump or measuring apparatus described above works as follows:
  • suction duct end or opening 8 is maintained in the open position by actuating or operating rod 22.
  • the liquid to be measured and delivered flows from suction line 6 through the suction duct or inlet conduit 7, ends or openings 8 and 9 and duct or connecting conduit 10 into the bore 2 of the pump body member.
  • the control edge 20a of the control disc 20 encounters or strikes the guide roller 30 and raises rod 26 thus causing duct end or opening 9 to open while the guide roller 46 rolls off the control edge or band 20b and in so doing presses rod 22 slightly in a downward direction so that the suction duct end or opening 8 is closed.
  • the liquid to be delivered comes into contact exclusively with material whch is resistant to chemicals, that is, glass, polytetrafluoroethylene or the like.
  • material whch is resistant to chemicals, that is, glass, polytetrafluoroethylene or the like.
  • sealing collar or cup seal 4 Depending on the composition of the solution to be delivered, there can take place in the region of the sealing collar or cup seal 4, at the wetted surface of the piston, an evaporation of the solvent as well as an undesired crystallization.
  • sealing collar or cup seal 4 is surrounded by a housing or casing 32 which is sealed by means of an O-ring against the reciprocating glass piston 3 which moves along its vertical axis. A certain amount of fluid or water is retained inside housing 32.
  • Housing or casing 32 is provided with two line-connections, an inflow or feed line 33 and an outflow or discharge line 34, so that the liquid filling of the housing or casing can be replaced from time to time as required. A strong dilution of the solution is hereby produced and the undesired crystallization is hindered or avoided at the sensitive sliding-points of the piston.
  • FIG. 2 A variant of the metering pump described above is shown diagrammatically in FIG. 2.
  • the reference symbols used in FIG. 1 are also used here for the corresponding parts.
  • the method of operating this pump embodiment does not differ fundamentally from the embodiment already described, so that all that has been said with reference to FIG. 1 also applies to the embodiment illustrated in FIG. 2.
  • a second piston 35 slidably supported in pump body member 1, coupled by means of piston rod 37, guided vertically in the support or bearing member 36, and a connecting rod 38 with a crank disc 39 adapted with a power source means.
  • Delivery duct or outlet conduit 12 opens or merges into bore 40, while a delivery duct 41 issuing from the latter is connected to a helical tube 42.
  • This twin-piston metering pump embodiment is provided in the event that initially a first liquid is to be drawn in, measured and conveyed, and the corresponding line is subsequently to be rinsed or flushed with a second liquid in order to avoid blockage failures or drag faults.
  • delivery line 6 is joined to a rinsing or flushing medium source, while the pipette tip 42a of the spiral tube 42 dips into the liquid sample or specimen.
  • piston 35 With the upward stroke of piston 35, a certain amount of sample or specimen is drawn into the pipette tip 420, while delivery piston 3 simultaneously suctions the rinsing agent into bore 2.
  • the downward stroke of the two pistons 3 and 35 the sample or specimen is first expelled from the spiral tube, whereupon the spiral tube, including the pipette tip, is washed with the rinsing or flushng medium flowing after.
  • the sealing collar or cup seal 4 which seals delivery piston 3 together with the diaphragm 14 may be constructed as an integral part or member.
  • a metering pump comprising a chemically inert pump body having a bore formed therein, a piston operably positioned in said bore, a fluid receiving chamber associated with said pump body, a portion of said fluid receiving chamber being defined by a wall comprising a part of said pump body, another portion of said fluid receiving chamber being defined by the inner surface of a flexible member, portions of said flexible member being selectively movable, one end of an inlet conduit means, a connecting conduit means and an outlet conduit means opening into said fluid receiving chamber, the other end of said connecting conduit means being operably associated with said bore, the said flexible member having a first stoppering portion in one position of the flexible member adapted to overlie said inlet conduit, and a second stoppering portion in another position of the flexible member adapted to overlie said outlet conduit, 21 first actuating member secured to said flexible member and adapted to move said first stoppering portion between positions, whereby said one end of said inlet conduit means is opened or closed, a second actuating member secured to said flexible member and

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Sampling And Sample Adjustment (AREA)
US265890A 1971-07-06 1972-06-23 Metering apparatus Expired - Lifetime US3869225A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH990671A CH541130A (de) 1971-07-06 1971-07-06 Dosierpumpe

Publications (1)

Publication Number Publication Date
US3869225A true US3869225A (en) 1975-03-04

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ID=4356966

Family Applications (1)

Application Number Title Priority Date Filing Date
US265890A Expired - Lifetime US3869225A (en) 1971-07-06 1972-06-23 Metering apparatus

Country Status (8)

Country Link
US (1) US3869225A (enrdf_load_stackoverflow)
CH (1) CH541130A (enrdf_load_stackoverflow)
DD (1) DD100882A5 (enrdf_load_stackoverflow)
DE (1) DE2233320A1 (enrdf_load_stackoverflow)
FR (1) FR2145289A5 (enrdf_load_stackoverflow)
GB (1) GB1400601A (enrdf_load_stackoverflow)
NL (1) NL7208182A (enrdf_load_stackoverflow)
SE (1) SE369096B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119348890A (zh) * 2024-12-26 2025-01-24 江苏尚纯自动化技术有限公司 一种半导体蚀刻液的自动化包装装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700800C3 (de) * 1977-01-11 1980-10-16 Herbert 4690 Herne Kuhlmann Steuerschieber für Betonpumpen
DK136378A (da) 1978-03-28 1979-09-29 Foss A S Doseringspumpe
US4303376A (en) * 1979-07-09 1981-12-01 Baxter Travenol Laboratories, Inc. Flow metering cassette and controller
FI70455C (fi) * 1982-02-10 1986-09-19 Rosenlew Ab Oy W Ventilmanoevreringsanordning foer en doseringspump foer en faergnyanseringsmaskin
SE449508B (sv) * 1982-03-09 1987-05-04 Lkb Produkter Ab Anordning vid en kolvpump for pumpning av ett pumpmedium
FR2523720B1 (fr) * 1982-03-19 1985-12-27 Remy & Cie E P Dispositif de dosage volumetrique
US4687426A (en) * 1984-07-31 1987-08-18 Fuji Techno Kogyo Kabushiki Kaisha Constant volume pulsation-free reciprocating pump

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308974A (en) * 1939-11-01 1943-01-19 Lyndus E Harper Positive displacement pump
US2330781A (en) * 1941-05-28 1943-09-28 Standard Oil Dev Co Conveying fluids containing solids
US2356738A (en) * 1943-02-12 1944-08-29 Hans C Brugger Pump
US2485208A (en) * 1947-11-17 1949-10-18 Chain Belt Co Concrete placement apparatus
US2678609A (en) * 1948-03-06 1954-05-18 Emsco Mfg Company Lubricating and sealing means
US3320901A (en) * 1965-09-15 1967-05-23 F W Gartner Company Concrete pump
US3333543A (en) * 1964-12-18 1967-08-01 Sarl Sonal Metering pump
US3606596A (en) * 1970-04-14 1971-09-20 Miles Lowell Edwards Drug dispensing pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308974A (en) * 1939-11-01 1943-01-19 Lyndus E Harper Positive displacement pump
US2330781A (en) * 1941-05-28 1943-09-28 Standard Oil Dev Co Conveying fluids containing solids
US2356738A (en) * 1943-02-12 1944-08-29 Hans C Brugger Pump
US2485208A (en) * 1947-11-17 1949-10-18 Chain Belt Co Concrete placement apparatus
US2678609A (en) * 1948-03-06 1954-05-18 Emsco Mfg Company Lubricating and sealing means
US3333543A (en) * 1964-12-18 1967-08-01 Sarl Sonal Metering pump
US3320901A (en) * 1965-09-15 1967-05-23 F W Gartner Company Concrete pump
US3606596A (en) * 1970-04-14 1971-09-20 Miles Lowell Edwards Drug dispensing pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119348890A (zh) * 2024-12-26 2025-01-24 江苏尚纯自动化技术有限公司 一种半导体蚀刻液的自动化包装装置

Also Published As

Publication number Publication date
DD100882A5 (enrdf_load_stackoverflow) 1973-10-12
GB1400601A (en) 1975-07-16
CH541130A (de) 1973-08-31
DE2233320A1 (de) 1973-01-18
FR2145289A5 (enrdf_load_stackoverflow) 1973-02-16
NL7208182A (enrdf_load_stackoverflow) 1973-01-09
SE369096B (enrdf_load_stackoverflow) 1974-08-05

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