EP0434723A1 - Regulateur de debit - Google Patents

Regulateur de debit

Info

Publication number
EP0434723A1
EP0434723A1 EP19890910216 EP89910216A EP0434723A1 EP 0434723 A1 EP0434723 A1 EP 0434723A1 EP 19890910216 EP19890910216 EP 19890910216 EP 89910216 A EP89910216 A EP 89910216A EP 0434723 A1 EP0434723 A1 EP 0434723A1
Authority
EP
European Patent Office
Prior art keywords
flow
bodies
fluid
container
series
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.)
Ceased
Application number
EP19890910216
Other languages
German (de)
English (en)
Inventor
Lage Brodefors
Lars Irstam
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0434723A1 publication Critical patent/EP0434723A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0186—Control of flow without auxiliary power without moving parts
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow

Definitions

  • the method according to the invention serves to set a specific flow for a specific fluid flowing through a pipe, and the method is characterised by causing the fluid to flow through a porous body having predetermined flow resistance characteristics, and being selected to permit a through-flow in the desired flow interval, and also by setting the specific desired flow by adjusting the fluid pressure drop across the body.
  • One embodiment of the method comprises prefabricating various series of porous bodies having fluid through-flow characteristics, carefully predetermined within each series, designed to produce a predetermined flow for a specific fluid and a predetermined fluid pressure differ ⁇ ence above the body.
  • the method according to the invention also entails the advantage that many impurities in the fluid can be filtered out by the body. If the body becomes clogged by such impurities, this will result in the flow being re ⁇ stricted which in most applications is an advantage, if any deviation from rated flow appears.
  • the method according to the invention also permits the use of one body for each occasion, i.e. the bodies are of disposable nature.
  • the various series of bodies can thus be provided with markings corresponding to a certain flow interval.
  • the container in which the body is to be placed may be transparent to enable the marking on the body to be inspected after insertion in the container.
  • the container is naturally inserted in the pipe through which the fluid is flowing, its two ends suitably being joined to respective parts of the pipe, and a casing tightly sealed to the casing of the body, thus causing the fluid to flow through the body in predetermined manner.
  • the method as claimed is also based on the realization that porous bodies having all the properties mentioned above can be produced by sintering a compacted body made from a suitable powder.
  • a sintered body of stainless metallic powder is thus suitable and conventional methods of manufacturing such bodies give very slight variations in the flow characteristics for each type of body. It has been found, for instance, that sintered compacted bodies made of powder from stainless billets (e.g. steel or titanium) have predictable properties at compacting- and sintering, which are suitable and conventional for the materials in question. It has thus been found that a standard deviation curve with substantially vertical flanks can be obtained in the bodies, indicating that the charact- eristics in the bodies are extremely similar.
  • the bodies do not release any free particles which can be flushed away by the fluid flowing through them.
  • the porous bodies may advantageously be shaped as straight cylinders. It is of course desirable for the flow distri ⁇ bution to be constant across the fluid through-flow cross ⁇ ection of the body and it is relatively simple to achieve this by suitably chosen geometry for the body and suitable compacting conditions.
  • An apparatus for setting a desired flow for a specific fluid flowing through a pipe is characterised by a container with fluid flowing through it connected into the pipe, and a porous body inserted in the container, said body having predetermined fluid through-flow characteristics, and means for regulating the pressure difference across the body.
  • the porous body is a sintered compacted body of powder, particularly stainless metallic powder.
  • the body is suitabl of disposable nature and it is therefore advantageous to be able with simple means to produce a series of bodies with predetermined flow-resistance characterised, all the bodies in practice having almost identical through- flow characteristics, so that the pressure can be used as control magnitude to set a predetermined flow, particularly without any calibration of the bodies.
  • the apparatus may thus include at least two series of bodies, the bodies in each group having substantially constant flow characteristics and the bodies in the various groups having different and predetermined flow characteristics.
  • the bodies are suitably provided with markings corresponding to their flow characteristics.
  • the invention also encompasses the use of porous bodies with well defined flow-resistance characteristics, offering simple control of fluid flowing through them, by means of pressure-control equipment.
  • the invention can be described by stating that, thanks to its properties, the porous body determines the size of the flow due to the pressure drop over the body.
  • the flow can thus be controlled, using relatively simple means to control the pressure, provided the porous bodies are manufactured having identical fluid through-flow characteristics, particularly bodies having flow characteristics which can be predetermined.
  • the bodies are normally a few mm long and have a diameter of 3 - 8 mm.
  • Titanium is the alternative and this may be preferred if sterile porous bodies are required.
  • the bodies When being used for gas, the bodies may be provided with a sealing casing, ensuring that the flow will pass axially through the whole body.
  • the seal between the casing of the body and the surroundings (chamber wall or the like) is more efficient and the sintered bodies can therefore be used as they are.
  • predetermined porosity can be produced with great certaint if a specific fraction or distribution of grain size is used. Compacting the powder bodies will then result in a specified porosity within wide compacting pressure limits (e.g. up to about 4000 bar) and under normal sintering conditions for the material selected.
  • Bodies according to the invention may be cylindrical in shape with a length of about 3 - 6 mm and a diameter of about 3 - 6 mm.
  • a cylindrical body with diameter 6 mm, length 4 mm and porosity about 2 micron, using a glucose solution (Ringer-solution) will give a through-flow of 1.4-28 cc/min at a pressure drop of. 100 cm water column. A flow of up to 60 cc/min was obtained in some tests.
  • bodies according to the invention having diameter 3 - 6 mm and length 3 - 6 mm produce a
  • the bodies can be used to advantage as main components in simple, robust new designs for dosing equipment.
  • the complicated dosing pumps currently used for dosing insulin, cytotoxins, etc. can therefore perhaps be entirely avoided.
  • the bodies can also be used, for instance, for supplying gas to liquid, e.g. for oxygenating liquid (0 2 to water in fish farms) .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Powder Metallurgy (AREA)

Abstract

On peut produire, tout en utilisant des procédés de fabrication conventionnels, des corps poreux frittés faits de poudre compacte et ayant la forme de cylindres droits, qui présentent de très faibles variations de résistance à la circulation de liquides. L'invention prévoit de produire de tels corps en série, de sorte que, pour un fluide donné et pour une chute de pression donnée en amont du corps, on peut pré-établir un débit que l'on peut aisément réguler au moyen d'un dispositif simple de régulation de pression permettant de contrôler la chute de pression. L'appareil comprend un tube muni de dispositifs régulateurs de pression, un récipient pour le corps tel que décrit dans l'invention, et une série de corps qui présentant des résistances à la circulation différentes, permettant ainsi de fixer des écarts de débit différents dans le tube pour des fluides donnés. On décrit également un procédé permettant de fixer un débit précis, pour un fluide donné à une pression donnée, et l'utilisation de corps poreux bien définis permettant de fixer la pression désirée en régulant la chute de pression dans le corps.
EP19890910216 1988-09-16 1989-09-15 Regulateur de debit Ceased EP0434723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8803272 1988-09-16
SE8803272A SE464599B (sv) 1988-09-16 1988-09-16 Foerfarande och anordning foer instaellning av ett i foervaeg bestaemt fluidfloede

Publications (1)

Publication Number Publication Date
EP0434723A1 true EP0434723A1 (fr) 1991-07-03

Family

ID=20373349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890910216 Ceased EP0434723A1 (fr) 1988-09-16 1989-09-15 Regulateur de debit

Country Status (3)

Country Link
EP (1) EP0434723A1 (fr)
SE (1) SE464599B (fr)
WO (1) WO1990002988A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE896567C (de) * 1951-02-06 1953-11-12 Koppers Gmbh Heinrich Einrichtung zur Regelung des Gasmengenstromes
US3079796A (en) * 1960-02-04 1963-03-05 Daniel Orifice Fitting Company Orifice plate transfer apparatus
US3129582A (en) * 1963-02-20 1964-04-21 King Tester Corp Portable hardness tester
FR1492508A (fr) * 1966-09-09 1967-08-18 Teltov Geraete Regler Dispositif pour mesurer le débit de fluides gazeux ou liquides dans des conduites fermées
US3792609A (en) * 1971-05-10 1974-02-19 Tylan Corp Flow splitter
US3951377A (en) * 1974-11-07 1976-04-20 The United States Of America As Represented By The Secretary Of The Navy Rolling-gate, quiet-throttling, flow-control valve
US4393651A (en) * 1980-09-02 1983-07-19 Chandler Evans Inc. Fuel control method and apparatus
US4422339A (en) * 1982-10-25 1983-12-27 Mcjunkin Corporation Orifice fitting for a gas pressure differential-measuring system
DE3639161A1 (de) * 1985-11-28 1987-06-04 Volkswagen Ag Zumesseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9002988A1 *

Also Published As

Publication number Publication date
WO1990002988A1 (fr) 1990-03-22
SE8803272L (sv) 1990-03-17
SE464599B (sv) 1991-05-13
SE8803272D0 (sv) 1988-09-16

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19910313

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STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19940304