EP0188461A1 - Regulateur de debit a piston equilibre par la pression pour fournir un debit constant - Google Patents

Regulateur de debit a piston equilibre par la pression pour fournir un debit constant

Info

Publication number
EP0188461A1
EP0188461A1 EP85903131A EP85903131A EP0188461A1 EP 0188461 A1 EP0188461 A1 EP 0188461A1 EP 85903131 A EP85903131 A EP 85903131A EP 85903131 A EP85903131 A EP 85903131A EP 0188461 A1 EP0188461 A1 EP 0188461A1
Authority
EP
European Patent Office
Prior art keywords
piston
flow
pressure
outlet
pressure sensing
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.)
Withdrawn
Application number
EP85903131A
Other languages
German (de)
English (en)
Other versions
EP0188461A4 (fr
Inventor
Preben H. Kent
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.)
Brunswick Valve and Control Inc
Original Assignee
Brunswick Valve and Control Inc
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 Brunswick Valve and Control Inc filed Critical Brunswick Valve and Control Inc
Publication of EP0188461A1 publication Critical patent/EP0188461A1/fr
Publication of EP0188461A4 publication Critical patent/EP0188461A4/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • This invention relates generally to proportion ⁇ al constant delivery fluid flow controllers, and more particularly to the type of controller wherein the pres- sures of the fluid supply and delivered fluid are applied to the opposite ends of a reciprocating piston in order to maintain constant volume flow to a load.
  • the device disclosed here is novel in that pro ⁇ portionality is achieved through pressure balancing a single reciprocating piston through the use of essential ⁇ ly equal pressure sensing areas on either end of the piston or closure member.
  • the units' inlet and outlet portions in fluid communication, i.e. connected across a flow control orifice, both delivered or outlet fluid pressure and inlet fluid pressure act on the common piston, thereby translating the piston in accordance with the pressure .drop occasioned by variations in supply pressure and/or demand.
  • the inlet portion of the control piston and its' surrounding housing define a variable control orifice and bypass port.
  • the proportional bypass flow con- troller is extremely simple in operation, employing two moving parts.
  • the novel pressure balanced piston allows the use of a relatively high rate balancing spring provid ⁇ ing an effective high proportional gain.
  • Figure 1 is a cross-sectional view of the regu ⁇ lator disclosed, particularly showing the reciprocating integral piston and poppet assembly, with input, output, and bypass ports, all in the closed or non-bypassing con ⁇ dition.
  • Figure 2 is an additional cross-sectional view of Figure 1 incorporated into a semi-schematic diagram of the regulator of the invention in a preferred hydraulic circuit, particularly showing an associated flow orifice.
  • Figure 3 is a diagram of the system particular ⁇ ly showing the functional equivalents of the regulator of the invention, and preferred system.
  • the con ⁇ troller of the invention utilizes a piston/damping assem ⁇ bly 6, mounted for reciprocal motion internal of the con ⁇ troller housing or body 4.
  • the piston assembly comprises a poppet closure portion 43 cooperating with an internal connoidal poppet seat 40.
  • the poppet closure 43 is inter ⁇ mediate a damping piston portion 50, and a piston barrel portion 44 of the piston assembly 6.
  • the barrel portion of the piston assembly defines a piston cavity 45 contain- ing the controller proportioning spring 48.
  • Adjacent the open end of the cavity 45 is a plug and spring retainer 8, " having an internal surface abutting the controller proportioning spring for establishing initial closure force for biasing or calibrating the poppet closure portion 43 of the piston assembly 6 against the cavity seat 40.
  • the controller body cavity 36 and the piston barrel cavity 45 are in fluid communication with the outlet fluid pressure exiting the orifice 24 via outlet port 12.
  • Bypass fluid flow enters the circumferential bypass flow volume 52 via the inlet orifice 10.
  • Bypass flow passing through the variable poppet control orifice 41 enters the circumferential bypass flow volume 38 and exits the flow controller through the bypass outlet port 14 for return to the sump 22 via conduit 28.
  • the controller 2 of the invention is shown having a fluid supply delivered by a pump 18 through a conduit 16 to the controller inlet port 10.
  • Fluid supplied by conduit 16 also passes through external orifice 24.
  • the fluid pressure at the outlet of orifice 24 is applied to the controller via outlet orifice 12.
  • the pressure of fluid exiting orifice 24 is sensed at 12, fluid is then transmitted to an external system (not shown) via conduit 26.
  • bypass fluid flow entering the inlet orifice 10 passes through flow volume 52 and a variable orifice 41 defined by the regulator cavity seat 40 and the poppet closure portion 43 of the fluid control piston assembly 6.
  • the bypass fluid then enters the controller body cavity circumferential bypass flow area 38.
  • Cavity 38 is in fluid communication with the controller bypass outlet port 14 and is returned to the fluid sump 22 through bypass flow conduit 28.
  • the flow control piston barrel 44 incorporates a plurality of grooves 46 at its outer periphery. As the piston/cylinder diametral clearance is relatively small, these grooves act as a labyrinth seal between the cooper- ating surfaces of piston barrel and cylinder inner wall. The low friction characteristic of this type of fluid seal greatly reduces the force hysteresis or "stiction" opposing movement of the piston pressure sensing assembly 6 within the flow control body cavity or cylinder 36. This structure greatly increases the sensitivity of the disclosed controller to small variations in differential or flow pressure across the effective piston areas at or adjacent to the poppet closure member at 43, and the flow control barrel 45.
  • variable flow control ori ⁇ fice 41 When the piston upstream pressure exceeds a predetermined value, overcoming the spring biasing force, movement of the piston disengages the poppet closure por- tion 43 from its cooperating seat 40 allowing bypass flow to enter the cavity 38 through variable flow control ori ⁇ fice 41. Variations in pumped supply volume and pressure are therefore controlled through the piston motion, there ⁇ by bypassing varying quantities of fluid in order to main- tain a constant output or flow volume to the conduit 26. In the event that the outlet pressure sensed via outlet port 12 were to decrease, the motion of the piston assem ⁇ bly would further increase fluid bypass, thereby maintain ⁇ ing the constant volume flow. Conversely, should the outlet pressure increase, piston movement would decrease the amount of bypass fluid, thereby maintaining the outlet volume flow.
  • action of the biased piston assembly 6 acts as a proportional controller in that, fluid is bypassed in proportion to the pressure drop exerted on either end of the piston assembly, thus maintaining constant fluid output.
  • the controller disclosed due to the novel design of the poppet closure portion 43 as it cooperates with the body cavity seat 40, establishes a pressure balanced operating environment for the piston assembly 6.
  • the balanced nature of the piston is due to essentially equal diameters of the effective pressure sensing area at the poppet control orifice 41, and the effective pressure sensing areas of the piston barrel 44 adjacent the body cavity 36. Additionally, due to the large change in flow area of poppet control orifice 41 with small axial movements of piston 6, the proportional gain or proportionality constant between pressure differ ⁇ ential across the piston and bypassed fluid is high, re- suiting in a low droop or low proportional error control- ler. As indicated on the attached Table I, delivered fluid flow is controlled to close tolerances.
  • the piston assembly of the controller of this invention also incorporates a damping portion consisting of an integral damping piston 50, reciprocating in a re ⁇ quizd diameter portion 42 of the body 4.
  • the damping piston head 51 also incorporates a damping orifice 53.
  • a damping means insures that operation of the disclosed controller minimizes the possibility of pressure or fluid flow transients in the delivered fluid at the outlet of the controller.
  • the schematic system diagram o ' f Figure 3 dis ⁇ closes the functional aspect of the controller of the invention as used in a typical but not limiting applica ⁇ tion, wherein fluid is supplied through outlet conduit 26 to a system load 27, exhibiting a variable resistance to outlet fluid flow therethrough. As shown, in order to aid in disclosure, outlet of 27 is shown returned to the fluid sump 22. Those skilled in the art will readily recognize that this system is "typical" and that other types of varying demand would demonstrate the control function as well.
  • supply pump 18 deliveries fluid via 16 to the schematically depicted regulator 2 via con ⁇ duit 14. Fluid through conduit 16 is also supplied through variable orifice 24, to the outlet conduit 26. Outlet pressure of conduit 26 is supplied to the fluid control valve 2 via conduit 12. Elements of the analo- gous controller 2 corresponding to those in the flow controller of the invention are indicated as identical numbers carrying the prescript prime. Therefore, inlet pressure from conduit 12 acts on system barrel 44 prime, as does the inlet pressure at conduit 16 acts on effec- tive pressure sensing area 43 prime of the piston poppet assembly 6. Equivalent flow control seat 40 prime cooper ⁇ ates with piston control portion 43 prime to deliver a pressure sensitive bypass fluid flow via outlet port 10 prime, returning to the equivalent sump 22 prime.
  • the controller of the invention incorporates fea ⁇ tures of a novel structure, incorporating all of the fea ⁇ tures- of more expensive and complicated controllers, with a unit having two moving parts.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Flow Control (AREA)

Abstract

Un régulateur de débit (2) petit, léger, simple et extrêmement fiable comprend deux parties mobiles (6, 48), pour répartir un débit de fluide d'admission entre un orifice de sortie (26, 16) et d'admission. On obtient un débit constant de sortie dans une plage considérable de pressions et de débits d'entrée grâce à l'utilisation d'un piston (6) de régulation de débit à débit équilibré qui exécute un mouvement alternatif à l'intérieur d'un boîtier (4). Le piston équilibré est armé par un ressort (48) interne dans une plage prédéterminée de positionnement. L'unité opère normalement avec l'orifice de sortie détecteur de pression en communication fluide avec un orifice extérieur (24). Un orifice de dérivation (14) en communication avec l'orifice d'admission de régulateur adjacent au piston de régulation refoule l'excès de fluide au réservoir (22) d'un système de fluide pompé. Des augmentations du débit d'admission dans les régulateur/orifice combinés ont pour effet d'ajuster la position du piston équilibré et d'initier ou d'augmenter le débit à travers un orifice intégré de régulation de piston/assiette. La pression de sortie ou d'aval de l'orifice extérieur est détectée par une zone égale du piston située vers l'extrémité de l'assiette du cylindre et/ou du côté d'admission du piston. Un piston amortisseur (50) s'appuie contre cette partie de détection de pression d'admission du piston afin de réduire au maximum des mouvements transitoires du piston ou vibrations.
EP19850903131 1984-07-06 1985-06-10 Regulateur de debit a piston equilibre par la pression pour fournir un debit constant. Withdrawn EP0188461A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62833384A 1984-07-06 1984-07-06
US628333 1984-07-06

Publications (2)

Publication Number Publication Date
EP0188461A1 true EP0188461A1 (fr) 1986-07-30
EP0188461A4 EP0188461A4 (fr) 1987-07-06

Family

ID=24518451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850903131 Withdrawn EP0188461A4 (fr) 1984-07-06 1985-06-10 Regulateur de debit a piston equilibre par la pression pour fournir un debit constant.

Country Status (6)

Country Link
EP (1) EP0188461A4 (fr)
JP (1) JPS61502988A (fr)
BR (1) BR8506815A (fr)
CA (1) CA1243251A (fr)
IL (1) IL75557A0 (fr)
WO (1) WO1986000731A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887632A (en) * 1987-05-20 1989-12-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Flow control apparatus
US6752168B1 (en) 1999-11-10 2004-06-22 Aker Maritime Asa System for controlling the working conditions for mechanical pumps, and a regulation valve for such a system
CA2450994C (fr) * 2003-11-27 2010-08-10 Weatherford Canada Ltd. Methode et appareil pour controler le debit d'un fluide dans une canalisation
DE102010005524A1 (de) * 2010-01-23 2011-07-28 Robert Bosch GmbH, 70469 Stromregelventil mit Dämpfungskammer
DE102018220890A1 (de) * 2018-12-04 2020-06-04 B. Braun Melsungen Ag Infusionsanordnung zur Verabreichung eines medizinischen Fluids

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1804751A (en) * 1924-10-06 1931-05-12 Doble Steam Motors Corp Boiler feed water control device
US2748947A (en) * 1951-11-10 1956-06-05 A V Roe Canada Ltd Filter by-pass control
US3411416A (en) * 1965-01-29 1968-11-19 Eton Yale & Towne Inc Adjustable, metered, directional flow control arrangement

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No relevant documents have been disclosed. *
See also references of WO8600731A1 *

Also Published As

Publication number Publication date
CA1243251A (fr) 1988-10-18
WO1986000731A1 (fr) 1986-01-30
IL75557A0 (en) 1985-10-31
JPS61502988A (ja) 1986-12-18
BR8506815A (pt) 1986-11-25
EP0188461A4 (fr) 1987-07-06

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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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Inventor name: KENT, PREBEN, H.