EP0249496A1 - Appareil pour mélanger des liquides - Google Patents

Appareil pour mélanger des liquides Download PDF

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Publication number
EP0249496A1
EP0249496A1 EP87305246A EP87305246A EP0249496A1 EP 0249496 A1 EP0249496 A1 EP 0249496A1 EP 87305246 A EP87305246 A EP 87305246A EP 87305246 A EP87305246 A EP 87305246A EP 0249496 A1 EP0249496 A1 EP 0249496A1
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EP
European Patent Office
Prior art keywords
reservoir
liquid
syphon
duct
looped portion
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Withdrawn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
EP87305246A
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German (de)
English (en)
Inventor
John Mackellar Ballany
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.)
Robert Young & Co Ltd
Original Assignee
Robert Young & Co Ltd
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 Robert Young & Co Ltd filed Critical Robert Young & Co Ltd
Publication of EP0249496A1 publication Critical patent/EP0249496A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying

Definitions

  • This invention relates to a device for mixing at least one liquid with another, particularly a concentrate with a diluent.
  • the invention is especially useful for continuously topping up a treatment bath, such as a sheep dip.
  • a known device which is intended to automatically top up a sheep dip with an aqueous solution of insecticide at the correct concentration comprises a pair of balanced pans located beneath an overhead central water supply and each connected to a reservoir of concentrated insecticide.
  • the operation of the device is such that after an initial manual priming of the device with insecticide, the water supply is continually switched from one pan to the other by the action of the heavier filling pan falling to a discharge position whilst the lighter discharged pan rises.
  • the falling pan is also used to pump a measured quantity of concentrate into the rising empty pan.
  • This device which is a constant replenishment device, has advantages over the traditional methods in that a particular concentrate can be delivered in a diluent at an effectively constant level. However, it has several moving parts which could fail if the device did not receive adequate maintenance and it does require manual priming. Further, it is not readily adaptable to deliver different concentration levels, or to operate at different delivery rates.
  • An object of this invention is to obviate or mitigate the disadvantages of traditional methods and provide a simple but effective liquid mixer, which can replenish the dipping bath continuously.
  • this invention provides liquid mixing apparatus which comprises a first reservoir for a first liquid, at least one further reservoir for another liquid which is to be mixed with the first liquid and continuous dosing means comprising a delivery duct through which the first liquid may be discharged from the first reservoir and at least one branch duct leading from the or each further reservoir and joining the delivery duct at a point intermediate its ends enabling in use the entrainment of the other liquid(s) by the first liquid and mixing thereof within the delivery duct whenever the first liquid is caused to flow from the first reservoir through the dosing means.
  • the first reservoir has a liquid supply inlet provided with liquid supply control means to provide for automatic filling of the first reservoir with liquid to a predetermined maximum level.
  • a float operated valve is used to regulate filling of the first reservoir,
  • the said further reservoir(s) may or may not contain the same liquid. Therefore the apparatus of this invention is suitable for mixing of two or more liquids.
  • the apparatus comprises a syphon conduit having an inlet end opening into the first reservoir at a level intermediate the predetermined maximum level and the minimum level of liquid in the first reservoir, said syphon conduit forming part of the duct for delivering liquid from the first reservoir and having a looped portion to which a further liquid is introduced from a further reservoir via a branch duct connected between the said further reservoir and said syphon conduit, the arrangement in use providing for the induction of a further liquid through the branch duct into an upper part of the looped portion of the syphon conduit whilst the first liquid is syphoned from the reservoir thereby introducing the further liquid into the first liquid and causing mixing thereof in the syphon conduit.
  • the looped portion of the syphon conduit is positioned in said first reservoir in a generally upstanding manner such that the upper part of the looped portion is substantially level with the inlet of the said syphon conduit.
  • said branch duct adjoins said syphon conduit at the uppermost part of the looped portion and is most preferably located slightly downstream of the highest point in said looped portion so that liquid introduced to said syphon loop tends to fall into the downstream part of the syphon loop.
  • the further reservoir is a vessel of high liquid surface area to low liquid depth ratio which is located within the first reservoir at a position substantially level with the uppermost part of the looped portion of the syphon conduit so that gravity plays little or no part in the introduction of the further liquid from the further reservoir to said syphon loop.
  • the branch duct has a curved portion rising above the level of connection with the further reservoir and the said syphon loop to avoid the possibility of draining of the further liquid into the syphon conduit should it become filled with air as a result of a break in the syphon effect should the first liquid supply fail, for example.
  • Alternative branch ducts of larger or smaller diameter may be substituted to vary concentration of mixed liquids.
  • the delivery duct comprises a venturi tube connected to the first reservoir at a suitable location to provide at least part of the delivery duct for drainage of liquid from the first reservoir and at least one branch duct connected to the further reservoir(s) and communicating with the venturi tube via at least one orifice adjacent to, and downstream of the vena contracta whereby a liquid contained in the further reservoir(s) will be caused to mix with a first liquid flowing through the venturi at a sufficiently high flow rate.
  • the flow rate required will depend on the liquids used and may be predicted from knowledge of the specific gravity of the respective liquids or determined by elementary trial and experimentation.
  • the first reservoir will normally contain a bulk volume of diluent whilst the further reservoir(s) will contain concentrate.
  • the invention is particularly useful in the preparation of aqueous solutions but is also applicable in the preparation of organic mixtures and solutions such as in the mixing of insecticide with diesel as a fogging agent, for example.
  • a convenient way of providing the head required at low flow rates is to provide a flotation chamber within the first reservoir to which the reservoir(s) for the other liquid(s) together with appropriate levelling and stabilising means may be attached whereby the reservoir(s) may be caused to maintain a constant head by floating upon and following the level of the first liquid in the first reservoir.
  • One way of controlling concentration of the mixture is by varying the orifice through which the second or further liquids pass into the dosing means, which may be achieved by providing exchangeable orifice plates or a manifold feeding multiple orifices.
  • the apparatus may include a plurality of venturi tubes to provide additional flexibility in control of mixture flow rates and concentration.
  • This embodiment is designed to supply concentrated sheep dip from a shallow planar-configuration reservoir to be diluted with water held in a larger bulk reservoir.
  • the apparatus comprises a suitably supported water reservoir (1) having an inlet (2) in an upper region through which a water supply is controlled by means of float operated valve (3, 4) such as a ball cock, and a drain (12).
  • a float operated valve such as a ball cock
  • a drain in the reservoir (1) there is provided an upstanding syphon pipe (5) having a looped portion (15), an inlet end (6) opening into the reservoir (1) at a level beneath the surface of the water normally maintained in the reservoir in use and an outlet end (7) including a tap (8) providing a duct for delivering mixed sheep dip solution from the apparatus.
  • the looped portion (15) of the syphon pipe (5) is connected to a shallow second reservoir (11) by a replaceable narrow bore duct or tubing (9) including a tap (10).
  • the tubing (9) feeds into an upper part (16) of the looped portion (15) so that water syphoning off through the pipe (5) from reservoir (1) entrains or sucks in concentrate from the reservoir (11) whilst the respective taps (8,10) are open.
  • the mixture will continue to vent from the outlet (7) as long as the water level remains above the inlet (6) of the syphon pipe (5). When the water level drops lower than the inlet (6) the apparatus automatically shuts down.
  • the position of the reservoir (11) in this embodiment is within the reservoir (1) at a level adjacent the upper part (16) of the looped portion (15) of the syphon pipe (5). This reduces the effect of syphoning or gravity effects on the liquid concentrate in the reservoir (11).
  • the positioning is not critical if a metering device were to be incorporated in the tubing (9). Such a metering device would avoid the need to replace the tubing (9) with tubing of a different bore in order to vary the concentration of the mixture produced within the syphon pipe (5).
  • the tubing (9) it is preferred to locate the tubing (9) in a particular manner to obtain the optimum result.
  • the concentrate tubing (9) firstly curves upwards from the reservoir (11) and then downwards to enter the syphon loop (15) at the upper part (16).
  • movement of the connection thereof away from a position slightly forward (downstream) of the uppermost part (16) by say 1/8" either upstream or downstream results in reduced concentrate entrainment effect.
  • This second embodiment of the invention is also intended to supply concentrated sheep dip from at least one relatively shallow reservoir which is diluted during delivery with water held in a larger bulk reservoir.
  • This embodiment is capable of delivering a controlled concentration of sheep dip continuously at higher delivery rates than that of Example 1.
  • the apparatus comprises a suitably supported water reservoir (21) having an inlet (22) in an upper region of the water reservoir through which a water supply is controlled by means of a float operated valve (23, 24) such as a ball cock.
  • a sheep dip delivery duct which has an inlet end (26) opening into the reservoir (21), a central mixing and dosing portion (25) and an outlet end (27) provided with a valve (28) for controlled discharge of mixed sheep dip.
  • the central portion (25) houses a venturi tube to which there is connected a branch duct (29) which includes a valve (30) and an exchangeable dilution control orifice (39) for feeding concentrated liquid sheep dip from a smaller reservoir (31).
  • the branch duct (29) connects at one end with the venturi tube within the central portion (25) at a suitable point adjacent to, and downstream of the vena contracta to ensure that concentrate is entrained and mixed with water discharging through the delivery tube by the effect created by the flow of water through the venturi tube.
  • the other end passes through the wall of the reservoir (21) and continues with a with a flexible portion (29 ⁇ ) which is connected beneath the flotation chamber (32) to a conduit (35) communicating with the reservoir (31).
  • the diluent is water and in order to ensure that the correct amount of concentrate is entrained whenever the apparatus is to be operated at relatively low flow rates when the venturi effect will be negligible, a buoyancy or flotation chamber (32) is provided beneath the reservoir (31) to support same above the water level in the bulk diluent reservoir (21).
  • the concentrate reservoir (31) is provided with appropriate stabilising members (33,33 ⁇ ) and guide lugs (34,34 ⁇ ) allowing the concentrate reservoir (31) to rise and fall with the water level in the bulk diluent reservoir (21) so as to provide a pre-determined constant head of concentrate thereby ensuring a positive feed of concentrate into the delivery duct for mixing with diluent.
  • the flotation chamber (32) is of course simply an optional feature which is unnecessary at the higher flow rates which this embodiment is intended operate at. Less favourable but acceptable operation of the invention can be obtained without the flotation chamber (32) at low flow rates if the concentrate reservoir(s) (31) are located outside the bulk diluent reservoir (21) and so mounted as to provide a head of concentrate as required in consideration of the relative specific gravities of concentrate and diluent.
  • a further optional feature which is not shown in the drawings is that of providing linkages for ganged operation of the valves (28, 30) which enables the automatic turning on of concentrate feed whenever the delivery valve (28) is turned on.
  • the dilution control orifice (39) may be replaced by multiple orifices in a manifold arrangement and multiple venturi assemblies may be incorporated in the delivery duct to provide increased delivery rates and/or control over the delivery and mixing of concentrate/diluent.
  • the embodiment illustrated also includes a baffle (36) which surrounds the inlet (26) to the delivery duct and reduces the possibility of any foreign matter being drawn into the delivery duct.
  • the following test data relate to the performance of this embodiment.
  • the apparatus was run at various flow rates, increasing the flow rate every 30 minutes and simultaneously drawing off a sample of delivered mixture for analysis. Two trial runs were carried out and the average of the two runs was represented graphically against a plot of the theoretically predicted performance of the apparatus. The outcome of the trials was considered to be very favourable. Further trials at various flow rates up to 20 litres per minute were carried out and are reported in the table below and represented in a further graph (See Fig. 5). Thereafter trials were also carried out at constant flow rates for periods of 30 minutes using the same dip (Cora) as before and sampling at 10 minute intervals. The following table shows the results obtained which were considered to be quite satisfactory.
  • Comparative tests were then carried out by using a conventional method to provide a dip for 400 sheep and the continuous method of this invention using an apparatus similar to that described in Example 2 to deliver Cora (Trade Mark) sheep dip for dipping a further 400 sheep.
  • the following table shows the results of the dip bath wash analysis. Both sets of washes were taken from the same dip bath. As can be seen from the data presented in the table above, the continuous method provides less violent swings of concentration in the bath.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
EP87305246A 1986-06-13 1987-06-12 Appareil pour mélanger des liquides Withdrawn EP0249496A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868614486A GB8614486D0 (en) 1986-06-13 1986-06-13 Liquid mixer
GB8614486 1986-06-13

Publications (1)

Publication Number Publication Date
EP0249496A1 true EP0249496A1 (fr) 1987-12-16

Family

ID=10599442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305246A Withdrawn EP0249496A1 (fr) 1986-06-13 1987-06-12 Appareil pour mélanger des liquides

Country Status (3)

Country Link
EP (1) EP0249496A1 (fr)
AU (1) AU7423087A (fr)
GB (1) GB8614486D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108211830A (zh) * 2018-02-06 2018-06-29 姜赫 一种浓缩液快速饮用器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU454064B2 (en) * 1971-03-23 1974-09-25 Albright & Wilson (Australia) Limited Improvements relating to dosing apparatus anda valve therefor
FR2403725A7 (fr) * 1977-09-16 1979-04-13 Midtgaard Niels Disometre
GB2023016A (en) * 1979-07-10 1979-12-28 Humphries W R Mixing liquids in fliow
DE2918451A1 (de) * 1979-05-08 1980-11-20 Heidelberger Zement Ag Verfahren zum dosieren und gleichmaessigen einmischen von zusatzmitteln in eine fluessigkeit oder ein foerdermedium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU454064B2 (en) * 1971-03-23 1974-09-25 Albright & Wilson (Australia) Limited Improvements relating to dosing apparatus anda valve therefor
FR2403725A7 (fr) * 1977-09-16 1979-04-13 Midtgaard Niels Disometre
DE2918451A1 (de) * 1979-05-08 1980-11-20 Heidelberger Zement Ag Verfahren zum dosieren und gleichmaessigen einmischen von zusatzmitteln in eine fluessigkeit oder ein foerdermedium
GB2023016A (en) * 1979-07-10 1979-12-28 Humphries W R Mixing liquids in fliow

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108211830A (zh) * 2018-02-06 2018-06-29 姜赫 一种浓缩液快速饮用器

Also Published As

Publication number Publication date
GB8614486D0 (en) 1986-07-16
AU7423087A (en) 1987-12-17

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Inventor name: BALLANY, JOHN MACKELLAR