US3760991A - Dosing device - Google Patents

Dosing device Download PDF

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Publication number
US3760991A
US3760991A US00226694A US3760991DA US3760991A US 3760991 A US3760991 A US 3760991A US 00226694 A US00226694 A US 00226694A US 3760991D A US3760991D A US 3760991DA US 3760991 A US3760991 A US 3760991A
Authority
US
United States
Prior art keywords
rotor
container
liquid
cover plate
tube
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
US00226694A
Other languages
English (en)
Inventor
G Brouwer
Dam J Van
W Lemmens
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3760991A publication Critical patent/US3760991A/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw 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
    • B01L3/0241—Drop counters; Drop formers
    • 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

Definitions

  • ABSTRACT A dosing device for the pulse-free and continuous supply of a very accurate small flow of liquid comprising a rotor which is enveloped by a housing and is coupled to a motor.
  • the rotor has shallow liquid pumping grooves and is vertically arranged.
  • One side of the housing is closed by a wall having an outlet aperture and the other side communicates with an auxiliary container.
  • the container has a cover plate carrying two tubes extending into the container.
  • One tube extends deeper down in said container than the other, and is cut 20 v M13 21 2 1.. 2H 3 1 M 2 M 2 2 2 2 2 1 a l m M 2 2 "m 2 "u m h 0 urm m L m m C d lm UhF 1: 1 2 8 555 [1.1.
  • the invention relates to a dosing device for the pulsefree and continuous supply of very accurately determined very small quantities of medium per unit time,
  • the device has a rotor enveloped by a housing and coupled to a driving mechanism.
  • the faces of rotor or housing facing each other have shallow liquid pumping grooves. Dosing devices of the above-indicated type are known.
  • This type of dosing devices is used, for example, in the microanalysis and in the automation of chemical analyses.
  • the quantities to be dosed are very small and cover the range from 30 cm per second to quantities smaller than 1 mm per second.
  • the liquid is forced to the pump outlet upon rotation of the rotor by the occurring viscous forces through the helically extending pumping grooves. It will be obvious that with the indicated very small quantities and the desirable great accuracy it is of importance to maintain the presble.
  • the invention provides an improved construction of a dosing device of the above-indicated type which is characterized in that the rotor with enveloping housing is arranged vertically, one end of the housing being closed by a wall having an outlet aperture and the other end of the housing communicating with an auxiliary container.
  • the container has a cover plate in which two tubes are incorporated the first of which extends deeper down in the auxiliary container than the second tube.
  • the second tube is wider than the first tube and its end within the auxiliary container is cut off at an angle.
  • the two tubes are capable of communication, if desirable via ducts, with the lower side of a closed container comprising the dosing liquid.
  • the container which comprises the liquid to be dosed may be constituted by a bottle as it can be normally obtained from the supplier.
  • a bottle should have a stopper which has two apertures which can be made to communicate with the first and the second tube.
  • the driving mechanism may be an electric motor arranged on the cover plate and coupled to the rotor via a flexible shaft.
  • the flexible shaft no great accuracy requirement need be imposed upon the alignment of the rotor housing and the motor.
  • This point is also of great importance in a further embodiment of the invention in which the rotor has a slightly conical construction. By slightly tilting the rotor and lowering it again, any air inclusions can be removed.
  • An additional advantage of a conical shape of the rotor is that it can be manufactured from a synthetic material in a self-detaching mould.
  • the shaft which is passed through the cover plate may be provided with a dishlike plate having an edge which is bent towards the cover plate.
  • Reference numeral 1 in the drawing denotes a rotor.
  • the rotor l is surrounded by a housing 2 which is sealed on the lower side by a wall 3 having an outlet aperture 4.
  • the housing 2 comprises on its inside a pattern of shallow helical grooves.
  • An auxiliary container 5 comprising a cover plate 6 is connected to the upperside of the housing 2.
  • a first tube 7 which container and a second tube 8 which terminates at a higher level in the auxiliary container.
  • the end 9 of the second tube 8 in the auxiliary container 5 is cut off at an angle, while the tube 8 furthermore is wider than the tube 7 and has a spigoted end.
  • the cover plate 6 furthermore comprises a seating 10 on which an electric motor 11 is arranged.
  • This electric motor 11 is connected to the rotor 1 via a flexible shaft 12.
  • a dish-like plate 13 of which the bent edge 14 is directed towards the cover plate 6 is provided on the shaft 12 passed through the cover plate.
  • the tubes 7 and 8 communicate via ducts l6 and 17, respectively, with two connections 18 and 19 in the stopper 20 of a bottle 21 which is arranged upside down and comprises the liquid to be dosed.
  • this dosing device is as follows.
  • liquid is pumped to the outlet 4 by the occurring viscous forces through the pattern of helical grooves.
  • air from the container 5 can flow to the bottle 21 so that in said bottle a smaller negative pressure adjusts above the liquid than corresponds to the hydrostatic pressure equilibrium.
  • this liquid flows from the bottle 21 via duct 16 and tube 7 into the container 5 until the liquid level again closes the end 9 of the tube 8.
  • the bottle 21 When the bottle 21 is empty, it may be replaced by a new one without interrupting the dosing. During said replacement of the bottle, the pump operates with the liquid still present in the auxiliary container 5.
  • a dosing device for providing a continuous supply of accurately determined quantities of dosing medium per unit of time comprising a housing, a lower wall having an outlet aperture closing one end of said housing, a vertically arranged rotor rotatably mounted within said housing, driving means coupled to said rotor for rotatably driving said rotor, a plurality of shallow liquid pumping grooves about the circumferential surface of said rotor, an auxiliary container communicating with the other end of said housing, a cover plate covering said auxiliary container, first and second liquid tubes carried by said cover plate, one end of each tube extending into said auxiliary container, said first tube being thinner than and extending deeper into said container than said second tube, said end of said second tube extended in said container having a truncated open end, the other end of said first and second tubes communicating with a supply of liquid to be dosed.
  • said driving means is an electric motor carried on said cover plate and coupled to said rotor by a flexible shaft.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Reciprocating Pumps (AREA)
  • Centrifugal Separators (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
US00226694A 1971-03-31 1972-02-16 Dosing device Expired - Lifetime US3760991A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7104264A NL7104264A (xx) 1971-03-31 1971-03-31

Publications (1)

Publication Number Publication Date
US3760991A true US3760991A (en) 1973-09-25

Family

ID=19812808

Family Applications (1)

Application Number Title Priority Date Filing Date
US00226694A Expired - Lifetime US3760991A (en) 1971-03-31 1972-02-16 Dosing device

Country Status (8)

Country Link
US (1) US3760991A (xx)
CA (1) CA952870A (xx)
DE (1) DE2211112A1 (xx)
FR (1) FR2132343B1 (xx)
GB (1) GB1386152A (xx)
IT (1) IT954818B (xx)
NL (1) NL7104264A (xx)
SE (1) SE386978B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11219328B2 (en) 2014-01-03 2022-01-11 Koninklijke Douwe Egberts B.V. System for preparing beverage consumptions

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3035340C2 (de) * 1980-09-19 1983-03-31 Boehringer Ingelheim Diagnostika GmbH, 8046 Garching Verfahren und Vorrichtung zur Verteilung von Proben aus Primärgefäßen
CA2381868C (en) 2002-04-16 2009-09-01 Hygiene-Technik Inc. Vacuum relief device
US7198175B2 (en) 2002-04-26 2007-04-03 Heiner Ophardt Manual or pump assist fluid dispenser
US7556178B2 (en) 2002-04-26 2009-07-07 Hygiene-Technik Inc. One-way valve and vacuum relief device
US7815076B2 (en) 2002-04-26 2010-10-19 Gotohti.Com Inc. Vacuum released valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539606A (en) * 1923-12-13 1925-05-26 Elmer H Smith Carbide-feeding means
US1870445A (en) * 1930-02-28 1932-08-09 Fractionator Company Apparatus for heat treating liquids
US3003641A (en) * 1958-07-25 1961-10-10 Minerals & Chem Philipp Corp Continuous percolation apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606186C (de) * 1933-07-18 1934-11-27 Albert Neumann Vorrichtung zur fortlaufenden Entnahme von Fluessigkeit aus einem Behaelter
FR1069380A (fr) * 1953-01-02 1954-07-07 Appareil destiné à maintenir un niveau constant dans un réservoir ou dans un carter de moteur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539606A (en) * 1923-12-13 1925-05-26 Elmer H Smith Carbide-feeding means
US1870445A (en) * 1930-02-28 1932-08-09 Fractionator Company Apparatus for heat treating liquids
US3003641A (en) * 1958-07-25 1961-10-10 Minerals & Chem Philipp Corp Continuous percolation apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11219328B2 (en) 2014-01-03 2022-01-11 Koninklijke Douwe Egberts B.V. System for preparing beverage consumptions

Also Published As

Publication number Publication date
DE2211112A1 (de) 1972-10-05
GB1386152A (en) 1975-03-05
IT954818B (it) 1973-09-15
CA952870A (en) 1974-08-13
FR2132343A1 (xx) 1972-11-17
FR2132343B1 (xx) 1975-06-13
SE386978B (sv) 1976-08-23
NL7104264A (xx) 1972-10-03

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