WO2015128769A1 - Séparateur pour la séparation d'un liquide plus lourd d'un liquide plus léger - Google Patents

Séparateur pour la séparation d'un liquide plus lourd d'un liquide plus léger Download PDF

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Publication number
WO2015128769A1
WO2015128769A1 PCT/IB2015/051084 IB2015051084W WO2015128769A1 WO 2015128769 A1 WO2015128769 A1 WO 2015128769A1 IB 2015051084 W IB2015051084 W IB 2015051084W WO 2015128769 A1 WO2015128769 A1 WO 2015128769A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
separator
casing
liquid
pressure
Prior art date
Application number
PCT/IB2015/051084
Other languages
English (en)
Inventor
John Edgar Scragg
Original Assignee
John Edgar Scragg
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 John Edgar Scragg filed Critical John Edgar Scragg
Priority to GB1615217.5A priority Critical patent/GB2538904A/en
Publication of WO2015128769A1 publication Critical patent/WO2015128769A1/fr
Priority to ZA2016/06216A priority patent/ZA201606216B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits

Definitions

  • THIS INVENTION relates to a separator for separating a heavier liquid from a lighter liquid.
  • the Applicant is also aware of separators which include means for automatically discharging accumulated water.
  • Such separators must be fitted on the pressure side of a lift pump.
  • Many engine layouts include such a pump which draws fuel from the tank and feeds it to the fuel injection system. Once a sufficient quantity of water has accumulated, a float lifts a valve closure member off a seat thereby to open a drain outlet. If the fuel feed pump is running at the time, then the pressure in the separator assists in discharging the accumulated water. If the pump is not running then water merely flows out under the effects of gravity.
  • the separators with automatic water discharge of which the Applicant is aware cannot be used on the suction side of the pump.
  • separators on the suction side of the pump are most common and can be fitted more readily, but cannot include automatic discharge of accumulated water.
  • my South African Patent Specification No. 95/8579 there is disclosed a separator capable of operating on the suction side of the fuel pump, and having means for automatically dumping water that has accumulated.
  • This separator has a number of advantages over a separator without such a facility.
  • One such advantage is that, by dumping water automatically, it relieves the operator of the engine of all responsibility. If he forgets to drain a separator without automatic water dumping, water can be carried over to the engine. A unit that drains automatically prevents this happening even if the driver is neglectful.
  • separation occurs before the lift pump (if one is provided) and fuel / water emulsification at the pump is avoided.
  • the main object of the present invention is to improve the separator of South African Patent Specification No. 95/8579.
  • a separator for separating a heavier liquid from a lighter liquid that floats on the heavier liquid
  • the separator comprising a casing having an inlet for a mixture of lighter and heavier liquids, a first outlet for the lighter liquid and a second outlet for the heavier liquid, the second outlet being at the lower end of said casing so that the heavier liquid which has accumulated in the lower part of said casing can be discharged therethrough, a float structure including a float which floats on the heavier liquid and sinks in the lighter liquid, first closure means which shuts-off said second outlet until the float is lifted by an accumulation of heavier liquid in said casing, the float structure further including a member which is connected to said float so that it moves therewith and the separator further including a diaphragm which is subjected on one side thereof to atmospheric pressure and on the other side thereof to the pressure in said casing, the diaphragm, when the pressure in said casing is below atmospheric, holding said member and said float in a position
  • Spring means can be provided for pushing the diaphragm against the backing plate.
  • the portion of the diaphragm which seals said opening is preferably thicker than other parts of the diaphragm.
  • said backing plate is in the form of a dome with said opening in the centre of the dome, and the diaphragm has its periphery secured to the backing plate at a location remote from said opening. It is the portion of the diaphragm which presses on the centre of the dome to close said opening which is thicker than the portion that presses on the remainder of the dome.
  • the opening in the backing plate can be encircled by a valve seat, and a valve closure element protruding from the diaphragm can be provided which enters said opening and makes sealing contact with the valve seat upon the pressure in the casing being above atmospheric.
  • Said closure element can be conical and is preferably moulded integrally with the diaphragm.
  • Figure 1 illustrates a separator and storage tank combination
  • Figure 2 illustrates a detail of a modified form of the combination of Figure 1 .
  • the separator illustrated is generally designated 10 and comprises a casing 12.
  • the fuel storage tank is generally designated 14.
  • the separator 10 and the tank 14 are connected by a main flow line in the form of a pipe 16.
  • the entrance to the pipe 16 is close to the bottom of the tank 14 and the exit from the pipe 16 is at the inlet 18 to the casing 12 of the separator 10.
  • the casing 12 has an outlet 22 close to the upper end thereof for lighter liquid designated L2 and an outlet 24 at the lower end thereof for heavier liquid designated L1 .
  • the suction side of a pump (not shown) is connected to the outlet 22.
  • Reference numeral 26 designates a float structure which includes a float 28 which floats on the heavier liquid L1 but sinks in the lighter liquid L2. It will be noted that the heavier liquid L1 accumulates at the lower end of the casing 12 and the lighter liquid L2 floats on the heavier liquid L1 .
  • the float structure 26 further includes a member 30 which is attached at its lower end to the float 28. The upper end of the member 30 is in contact with, but is not attached to, a diaphragm 32.
  • the diaphragm 32 is located adjacent a backing plate 34 which is manufactured from a synthetic plastics material.
  • the backing plate 34 has an opening 36 in it encircled by a valve seat 38.
  • a breather pipe 42 leads from the chamber 40 to atmosphere.
  • the upper surface of the diaphragm 32 is thus subjected, through the opening 36, to atmospheric pressure whilst the lower surface thereof is subject to the pressure within the casing 12.
  • the opening 36 is closed by the upper surface of the diaphragm 32. This is as a result of any internal pressure within the casing 12 and the memory of the diaphragm 32.
  • This position of the diaphragm 32 is shown as the solid line in Figure 1 .
  • a spring or springs (not shown) can be used to urge the diaphragm 32 against the backing plate 34.
  • the surface of the backing plate 34 limits upward movement of the diaphragm 32. Furthermore, the backing plate 34 reduces the risk of failure of the diaphragm 32 by preventing the diaphragm 32 from being unnecessarily stretched in the event of the internal pressure inside the casing 12 becoming positive, either as a result of positive pump pressure or as a result of the fuel tank being located above the separator 10 to provide a head.
  • a guide rod 46 extends down from the float 28 into the sub-housing 44 and ensures that the float 26 moves along a vertical line.
  • the outlet 24 communicates by way of a passage 48 with the interior of the sub- housing 44.
  • a valve seat 50 encircles the entrance to the passage 48 and closure means in the form of a valve closure element 52 co-operates with the seat 50 to provide an outlet valve.
  • a pin 54 is fixed to the valve closure element 52 and extends upwardly through the top wall of the sub-housing 44.
  • the guide rod 46 and the pin 54 are connected to a cross member 56. More specifically the member 56 is connected to the rod 46 so that its left hand end lifts and drops with the rod 46. Some sliding action is permitted between the rod 46 and the member 56 so that the rod 46 is not pulled off a vertical line by the member 56 when it pivots. At the end thereof remote from the rod 46 the member 56 is pivotally mounted on the sub- housing 44.
  • the holes in the top wall of the sub-housing 44 through which the guide rod 46 and the pin 54 pass are slightly oversized.
  • the member 56 passes through a slightly oversized transverse hole in the pin 54.
  • the member 56 thus displaces the pin 54 vertically as it lifts and drops whilst the slight freedom of movement of the member 56 in the hole of the pin 54 prevents skewing of the pin 54 off its vertical line by the pivoting member 56.
  • the member 56 provides a mechanical advantage so that the pin 54 and closure element 52 have a force exerted on them which is sufficient to lift the element 52 clear of the seat to open the outlet valve and to hold the element 52 against the seat 50 to close the outlet valve.
  • a subsidiary flow line in the form of a pipe 58 leads from the bottom of the tank 14 to the bottom of the separator 10.
  • the pipe 58 It is possible for the pipe 58 to be open at all times or alternatively or can be opened automatically when the level of heavy liquid that has accumulated in the tank 14 exceeds a predetermined level.
  • the exit from the pipe 58 is above the level of the interface I between the heavy liquid L1 and the lighter liquid L2 and is below a baffle 60.
  • the tank 14 will normally contain fuel and it is well known that fuel becomes contaminated with water. Because the specific gravity of water is greater than that of the fuel the two liquids tend to separate and the fuel tends to float on the water.
  • the outlet 22 is connected to a fuel pump (not shown) which feeds fuel to the engine which is to use the fuel stored in the tank 14.
  • the pressure in the casing 12 is atmospheric or above, depending on the difference between the level in the tank 14 and the level of the interface I. If sufficient water has collected in the lower part of the casing 12, the float 28 lifts carrying the rod 46, cross member 56 and pin 54 up with it.
  • the valve closure element 52 thus lifts off the seat 50 and water flows through the outlet 24 until such time as the float 28 drops to a position in which the element 52 bears down on the valve seat 50.
  • the diaphragm 32 does not restrict this downward movement.
  • the function of the diaphragm 32 is simply to ensure that, when there is a sub-atmospheric pressure in the casing 12, the float 28 cannot lift.
  • the capacity of the casing 12 is such that, during normal operation, the quantity of water that collects will never be such that it will be carried out of the outlet 22.
  • discharge of water will invariably occur before there is any danger of it being carried over into the fuel pump and hence to the engine.
  • annular gaps between the top wall of the sub-housing 44 on the one hand and the guide rod 46 and pin 54 on the other hand are such that water can enter the sub-housing 44 but solid particles in the fuel are prevented from reaching the interior of the sub-housing 44 and hence the valve seat 50. Such particles, if they lodge between the valve seat 50 and the valve closure element 52, can prevent the outlet 24 being closed off properly.
  • the diaphragm's "memory” or the spring (or springs) provided ensures that the diaphragm 32 seals on the valve seat 38, thus preventing fuel leakage from the casing 12 via the breather pipe 42.
  • the only part of the diaphragm 32 that is exposed to atmospheric pressure is one side of the portion that spans across the valve seat 38.
  • FIG. 2 this illustrates a modified form of diaphragm and also illustrates the mounting of the diaphragm.
  • the diaphragm of Figure 2 is designated 62 and is moulded so as to have a main part with a thinner wall than that of a minor part.
  • the diaphragm 62 is in the form of a dome. Its edge zone is between the flange 64 of a closure plate 66 and a peripheral part 68 of the backing plate designated 70.
  • the backing plate 70 is also in the form of a dome with the opening 36 in the centre of the dome.
  • the thicker walled part of the diaphragm 62 is in the form of a disc 72 which is moulded integrally with a cone 74.
  • a strengthening plate 76 is secured, either by welding or by means of a number of bolts, to the backing plate 70.
  • the opening 36 is in the plate 76 and the valve seat 38 encircles the opening 36.
  • the cone 74 enters the opening 36 and contacts the valve seat 38 when the pressure in the casing 12 is above atmospheric.
  • the member which is equivalent to the member 30 is designated 78.
  • the thick walled disc 72 ensures that the outlet remains closed even if the thinner walled part of the diaphragm is ruptured.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Float Valves (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

L'invention concerne un séparateur (10) pour la séparation d'un liquide plus lourd d'un liquide plus léger qui flotte sur le liquide plus lourd. Des liquides mélangés entrent dans le séparateur par une entrée (18). Il y a une sortie (22) pour le liquide plus léger et une sortie pour le liquide plus lourd (24). Il y a également un flotteur (28) qui flotte sur le liquide plus lourd et coule dans le liquide plus léger. Des éléments de fermeture (52) ferment la sortie (24) jusqu'à ce que le flotteur (28) soit soulevé par une accumulation de liquide plus lourd. Une tige de guidage (46) est reliée au flotteur de telle sorte qu'elle se déplace avec lui. Un diaphragme (32) est soumis d'un côté à la pression atmosphérique et de l'autre côté à la pression dans le séparateur. Le diaphragme, lorsque la pression dans le séparateur est au-dessous de la pression atmosphérique, maintient la tige et le flotteur dans une position dans laquelle l'élément (52) ferme la sortie (24). Une plaque support (34), contre laquelle le diaphragme (32) est pressé lorsque la pression dans le séparateur est supérieure ou égale à la pression atmosphérique, est disposée. La plaque support (34) comprend une ouverture qui expose le diaphragme à la pression atmosphérique.
PCT/IB2015/051084 2014-02-13 2015-02-13 Séparateur pour la séparation d'un liquide plus lourd d'un liquide plus léger WO2015128769A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1615217.5A GB2538904A (en) 2014-02-13 2015-02-13 A separator for separating a heavier liquid from a lighter liquid
ZA2016/06216A ZA201606216B (en) 2014-02-13 2016-09-07 A separator for separating a heavier liquid from a lighter liquid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201401103 2014-02-13
ZA2014/01103 2014-02-13

Publications (1)

Publication Number Publication Date
WO2015128769A1 true WO2015128769A1 (fr) 2015-09-03

Family

ID=54008244

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/051084 WO2015128769A1 (fr) 2014-02-13 2015-02-13 Séparateur pour la séparation d'un liquide plus lourd d'un liquide plus léger

Country Status (3)

Country Link
GB (1) GB2538904A (fr)
WO (1) WO2015128769A1 (fr)
ZA (1) ZA201606216B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105664536A (zh) * 2016-03-22 2016-06-15 沈阳化工大学 一种非均相混合液连续分离装置及其应用方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB419712A (en) * 1934-04-16 1934-11-16 Herbert Alexander Thompson Improvements in or relating to separators for liquids having different specific gravities
FR2236540A1 (en) * 1973-07-13 1975-02-07 Regel Lucien Automatic separation of immiscible fluids - of different densities particularly water and oil avoiding vibration or inclination losses
US4528094A (en) * 1981-08-06 1985-07-09 Scragg Edgar Peter Separation of two liquids
US4762614A (en) * 1980-12-24 1988-08-09 Allied-Signal Inc. Apparatus for removal of surface films from non-absorbent articles
DE19614829A1 (de) * 1994-10-13 1997-10-16 John Edgar Scragg Abscheider
US6479298B1 (en) * 1998-12-05 2002-11-12 Becton, Dickinson And Company Device and method for separating components of a fluid sample
US20070108118A1 (en) * 2005-11-14 2007-05-17 Driggers Matt G Fluid separation system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB419712A (en) * 1934-04-16 1934-11-16 Herbert Alexander Thompson Improvements in or relating to separators for liquids having different specific gravities
FR2236540A1 (en) * 1973-07-13 1975-02-07 Regel Lucien Automatic separation of immiscible fluids - of different densities particularly water and oil avoiding vibration or inclination losses
US4762614A (en) * 1980-12-24 1988-08-09 Allied-Signal Inc. Apparatus for removal of surface films from non-absorbent articles
US4528094A (en) * 1981-08-06 1985-07-09 Scragg Edgar Peter Separation of two liquids
DE19614829A1 (de) * 1994-10-13 1997-10-16 John Edgar Scragg Abscheider
US6479298B1 (en) * 1998-12-05 2002-11-12 Becton, Dickinson And Company Device and method for separating components of a fluid sample
US20070108118A1 (en) * 2005-11-14 2007-05-17 Driggers Matt G Fluid separation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105664536A (zh) * 2016-03-22 2016-06-15 沈阳化工大学 一种非均相混合液连续分离装置及其应用方法

Also Published As

Publication number Publication date
ZA201606216B (en) 2017-11-29
GB2538904A (en) 2016-11-30
GB201615217D0 (en) 2016-10-19

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