US3583423A - Dosing device for gaseous or liquid substances - Google Patents

Dosing device for gaseous or liquid substances Download PDF

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Publication number
US3583423A
US3583423A US858444A US3583423DA US3583423A US 3583423 A US3583423 A US 3583423A US 858444 A US858444 A US 858444A US 3583423D A US3583423D A US 3583423DA US 3583423 A US3583423 A US 3583423A
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US
United States
Prior art keywords
piston
pressure
chamber
pistons
cylinder
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
US858444A
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English (en)
Inventor
Hillebrand Johannes J Kraakman
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 US3583423A publication Critical patent/US3583423A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive

Definitions

  • the invention relates to a dosing device for supplying or removing quantities of gaseous or liquid substances to or from a space.
  • the dosing device is meant for dosing any desirable, not too large, quantity, for example, from a few cm. per second to a quantity zero, in which the pressure of the closed quantity may be from less than 1 atm. to some tens of atmospheres.
  • a dosing device as described above is characterized in that a cylinder comprises a piston assembly consisting of two pistons of the same diameters, between which a piston of a larger diameter is situated and chambers are situated between the pistons.
  • One of the two pistons, having equal diameters, and the piston having the larger diameter, have a circumferential groove on their circumference.
  • a communication duct for the substance to be dosed opens into the two chambers, a communication duct debouching near each of the free end faces of the pistons having the same diameters, in one of which an adjustable control pressure prevails, the other duct communicating with the ambient pressure.
  • the largest piston situated in the center of the piston assembly has on its circumference at least one axial slit which forms a communication, depending upon the axial position of the piston assembly, of an adjustable size between the chamber which is situated near the piston, which does not comprise a circumferential groove, and an annular space present in the cylinder wall. This space communicates with a duct for removing the substance to be dosed. Open communications are provided between the two annular grooves present on the said pistons, and the chamber in which the slit opens. The pressure in the chamber with which the slit communicates is regulated by the position of the piston assembly in the cylinder.
  • This pressure also prevails in the two annular grooves, whereas in the other chamber the pressure prevails of the desirable volume flow, said other chamber communicating, through a narrow gap formed between the piston parts and the cylinder wall parts of both the larger and the smaller diameters, with the two circumferential grooves in which the regulated pressure prevails.
  • the various elements of piston assembly and the cylinder are made of materials having different coefficients of expansion, so that upon temperature variations, the variation of the gap height compensates for the change of the viscosity of the liquid or the gas.
  • FIGURE of which shows a cross-sectional view of a cylinder with piston assembly which is arranged therein so as to be axially movable.
  • Reference numeral 1 in the drawing denotes a cylinder to which a cylinder cover 2 is secured. On the right-hand side, three communication possibilities 3, 4 and 5 are shown; on the left-hand side a fourth communication possibility 6 is shown in, the cover 2.
  • the cylinder 1 comprises a piston assembly consisting of two equal pistons 7 and 8, having diameters d, and a larger piston 9, having a diameter D, between the pistons 7 and 8.
  • the piston 7 has an annular groove 10; the piston 9 has a similar groove 11.
  • a chamber 12 is situated between the end face of the piston 7 and the cover 2; furthermore, a chamber 13 is situated between the cover 2 and the other side of the piston 9.
  • Similar chambers which are denoted by 14 and 15 are situated between a side face of the piston 9 and the cylinder 1 and between the end face of the piston 8 and the end ofthe cylinder.
  • duct 16 Centrally located in the piston assembly a duct 16 is provided which is in open communication, through apertures l7,
  • a duct 20 which is in open communication with the chamber 13, through a duct 21, opens into the connection possibility 3.
  • the connection possibility 5 communicates with the chamber 14, through a duct 22.
  • four slits 23 are provided; these slits open on the one hand into the chamber 14 and produce a communication with an annular space 24 in the cylinder wall having a size which is dependent upon the position of the piston assembly.
  • the annular space 24 communicates through a duct 25 with the ambient pressure.
  • the gap between the circumferences of the pistons and the respective cylinder walls lies in the order of magnitude of 20 .t.
  • An oil duct communicates with the connection 6, at a pressure p; which will be termed control pressure. It should be possible to adjust said pressure in accordance with the desirable supply, for example, at high-pressure level with a pressure regulating valve and at low-pressure level, for example, with a liquid column.
  • An oil duct communicates with the connection possibility 5 at a pressure, the value p: of which is regulated in chamber 14, by the overlap of the slits 23 and the annular space 24.
  • the regulating pressure p is larger than the pressure p,.
  • the pressure p prevails in the chamber 12, since there is an open communication through duct 22, duct 16, and apertures l7, l8 and 19.
  • the emanating pressure 1 prevails in the chamber 13, since said chamber is in open communication with the emanating aperture 3.
  • a laminar flow occurs in the two annular gaps 26 and 27.
  • the differential pressure p p follows from the equilibrium of forces of the piston assembly, namely:
  • This supply deviation as a result of the deviation in viscosity can be compensated for by making the gap height H in gaps 26 and 27 likewise a function of the tem perature, so that H /ufrom the supply formula for laminar flow likewise remains constant.
  • This can be realized with a suitable choice of the material of the cylinder and the piston assembly.
  • a suitable choice of the dimensions of the piston diameter and the gap height can also contribute to suppressing supply variations as a result of temperature influences.
  • the dosed quantity is supplied to a space; when this quantity has to be removed from a space, the duct in which the pressure p prevails is connected to the communication 4 and communication 6 remains open.
  • a dosing device for supplying or removing quantities of liquid or gaseous substances to or from a space, characterized in that a piston assembly is present in a cylinder and consists of two pistons of equal diameters, between which a piston of a larger diameter is situated and chambers are situated between the pistons, one of the two equal pistons and the piston having the larger diameter comprising on their circumference a circumferential groove, a communication duct for the substance to be dosed opening into the two chambers, a communication duct opening near each of the free end faces of the pistons having equal diameters in one of which an adjustable control pressure prevails, the other duct communicating with the ambient pressure, the largest piston situated in the center of the piston assembly comprising on its circumference at least one axial slit which forms a communication of an adjustable size.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Lift Valve (AREA)
  • Flow Control (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US858444A 1968-09-18 1969-09-16 Dosing device for gaseous or liquid substances Expired - Lifetime US3583423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6813306A NL6813306A (xx) 1968-09-18 1968-09-18

Publications (1)

Publication Number Publication Date
US3583423A true US3583423A (en) 1971-06-08

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ID=19804689

Family Applications (1)

Application Number Title Priority Date Filing Date
US858444A Expired - Lifetime US3583423A (en) 1968-09-18 1969-09-16 Dosing device for gaseous or liquid substances

Country Status (7)

Country Link
US (1) US3583423A (xx)
JP (1) JPS5016944B1 (xx)
CH (1) CH504047A (xx)
FR (1) FR2018346A1 (xx)
GB (1) GB1287911A (xx)
NL (1) NL6813306A (xx)
SE (1) SE367076B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140360589A1 (en) * 2013-06-07 2014-12-11 Sonnax Industries, Inc. Multiple Pressure Ratio Valve Assembly
RU2592661C1 (ru) * 2015-04-21 2016-07-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный технический университет" Способ работы поршневой машины и устройство для его осуществления

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2518796C1 (ru) * 2013-01-09 2014-06-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный технический университет" Машина объемного действия

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320968A (en) * 1964-05-04 1967-05-23 Chrysler Corp Flow control device
US3411416A (en) * 1965-01-29 1968-11-19 Eton Yale & Towne Inc Adjustable, metered, directional flow control arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320968A (en) * 1964-05-04 1967-05-23 Chrysler Corp Flow control device
US3411416A (en) * 1965-01-29 1968-11-19 Eton Yale & Towne Inc Adjustable, metered, directional flow control arrangement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140360589A1 (en) * 2013-06-07 2014-12-11 Sonnax Industries, Inc. Multiple Pressure Ratio Valve Assembly
US8955533B2 (en) * 2013-06-07 2015-02-17 Sonnax Industries, Inc. Multiple pressure ratio valve assembly
RU2592661C1 (ru) * 2015-04-21 2016-07-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный технический университет" Способ работы поршневой машины и устройство для его осуществления

Also Published As

Publication number Publication date
DE1945787B2 (de) 1976-12-23
SE367076B (xx) 1974-05-13
DE1945787A1 (de) 1970-03-26
GB1287911A (xx) 1972-09-06
CH504047A (de) 1971-02-28
FR2018346A1 (xx) 1970-05-29
JPS5016944B1 (xx) 1975-06-17
NL6813306A (xx) 1970-03-20

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