FR2464740A1 - MIXING APPARATUS - Google Patents

Abstract

THE INVENTION RELATES TO A MIXING APPARATUS. ITS OBJECT A MIXING APPARATUS INCLUDING A SUPPLY CONNECTION FOR A FIRST RESERVE OF LIQUID, A BODY TO DELIVER A DOSED QUANTITY OF LIQUID FROM THE FIRST SUPPLY CONNECTION TO A FIRST MIXING CHAMBER, A BODY TO DELIVER A DOSED QUANTITY OF LIQUID FROM THE FIRST SUPPLY CONNECTION TO A FIRST MIXING CHAMBER IN THE SAID FIRST MIXING CHAMBER, A SUPPLY CONNECTION FOR A SECOND RESERVE OF LIQUID, A BODY FOR DELIVERING A DOSED QUANTITY OF LIQUID FROM THE SECOND SUPPLY CONNECTION TO THE said FIRST MIXING CHAMBER, AND A RELIVER OF LIQUID AT THE SAID FIRST MIXING CHAMBER. APPLICATION IN PARTICULAR TO THE PREPARATION OF MIXTURES OF LIQUID CHEMICAL SUBSTANCES.

Description

The present invention relates to a mixing apparatus for a

  set of different liquid substances. It has heretofore been proposed to deliver a set of fluid constituents to be combined with a

  receiver or to a common supply line

  mune. Such a system is shown in U.S. Patent No. 2,641,271. This may involve difficulties if one or more of the chemicals is incompatible and the necessary structure

is expensive.

  U.S. Patent No. 3,442,453 discloses a

similar structure.

  U.S. Patent No. 2,600,877 discloses a device for mixing fluids in which a main line has a switch

  interposed 24 to periodically interrupt the

  fluid bit passing through the main pipe 20. A secondary pipe 22 conducts in the main pipe through a one-way valve 23 in a mixing chamber 26 beyond the switch 24 so that the inertia from the previous column

  of liquid beyond the switch 24 creates a success

  to open the valve 23 and suck a small

  amount of liquid B from the pipe 22.

  In FIG. 3, two secondary pipes 22 and 28 are shown as being in series flow in the main pipe, thus requiring two mixing chambers 25 and 29, two inertia columns 21 and

30 and two switches 24 and 31.

  In Figure 4 is shown an apparatus for mixing a very small proportion of fluid B to another fluid A.

  The latter patent does not provide for the

  Positive yield of metered quantities of additives, or effective stirring to ensure mixing, nor

  control in the event of exhaustion of one of the

  to add or stop when a predetermined amount of the correct mixture is available. U.S. Patent No. 2,645,463 discloses a method and apparatus for continuous flow mixing. In Fig. 3, a common fluid conduit 3 has conduit elements 11, 12 and 13

  with discharge end portions 11a, 12a and.

  13a, respectively, opening into the duct 3.

  Each of the individual conduit members contains a structure for causing turbulent flow, orifice plates 11b, 12b and 13b are provided for this purpose. As shown, two fluid streams are introduced into the common duct 3 through the ducts 11 and 12 to be mixed in the zone 14. The stream progresses beyond ci-icanes to cause a turbulent flow in the previously combined stream and to homogenize the mixture in the zone 14 before introduction of fluid through the conduit 13 and its orifice plate 13b. The reference to homogenization indicates an attempt to combine essentially immiscible or miscible substances with difficulty rather than combining soluble chemicals. This patent appears to have a continuous flowing current and is silent as to how to deliver the fluid through the individual ducts and assures

  not the delivery of measured quantities of substances.

  A precise dimensioning of the main conduit of this patent, and duct elements with their orifices,

  would be necessary to cause turbulent

  It is slow to obtain the desired mixing and homogenization if this could actually be achieved. If the

  quantities to be introduced were very small

  tionally to fluid flow, a serious problem

  would arise as to the aptitude of these small quantities

  turbulence in a mixing zone and a serious doubt as to the effectiveness of the

  distribution of the substance thus added.

  This patent also does not provide for a shutdown if a substance to be added is exhausted or a stop

  when an adequate amount of the mixture is available.

  In accordance with the present invention, a

  mixing apparatus is described to add successively

  chemical substances to a carrier liquid, such as water, which may be a solvent and which constitutes the predominant quantity of substance and

  especially when some of the chemical substances

  In a cascade arrangement of liquid-filled chambers in series, the respective chemical substances can be delivered separately according to the proportions desired by pumps, preferably adjustable in their flow rate, which can be fed from a pump. comuune9 energy source the carrier liquid and a first

  substance being delivered to a first chamber

  mixture and mixed therein, the contents of the first mixing chamber being delivered to

  a second mixing chamber in which a second

  chemical substance is introduced and mixed,

  additional mixing chambers to

  The chemicals supplied to them are intended to meet the requirements for the number of chemical substances to be mixed, with organs being provided to prevent reflux and to stop operation when one of the substances to be added is exhausted and when an adequate quantity of the mixture is available, the mixing chambers comprising separate containers may be provided with tanks

  partitions, or can be pump housings.

  The main object of the present invention is to provide a mixing apparatus for the chemical substances to be added to a carrier liquid which is of a

  a simple and uncomplicated structure that adds

  are difficult to assemble and increase the cost.

  Another object of the present invention is to provide a mixing system which is of a structure

  in order to reduce operational problems

  is lying. Another object of the present invention is to provide a mixing apparatus.

  are of simple structure and easy to assemble.

  Another object of the present invention is to provide a mixing apparatus in which are provided

  organs in view of a judgment in the event of exhaustion

  one of the substances to be added.

  Another object of the present invention is to provide a mixing apparatus in which the final product is delivered to a receiver or a storage chamber and which is cut when an adequate amount

  liquid mixing is available.

  Another object of the present invention is to provide a mixing apparatus which, in one embodiment, has a closed storage chamber with air or gas trapped therein which is delivered from the storage chamber to room

  auxiliary material preferably in the form of a

  flable when the level of liquid in the room

  of storage rises and returns to the storage room.

  age when the liquid level drops.

  Another object of the invention is to provide, in one embodiment of the invention, a closed reservoir having a mixing chamber assembly and a storage chamber separated by partitions mounted in the reservoir and carried in part, if desired, by a lid on the tank. Another object of the invention is to provide a mixing apparatus in which a reflux of the liquid

mixed is prevented.

  Another object of the invention is to provide a mixing apparatus for chemical substances to be added to a carrier liquid, wherein, according to one embodiment, the mixing chambers are

rotary pump housings.

  Another object of the invention is to provide a mixing apparatus in which a high degree of

  fluid agitation is obtained in each of a plurality of

  ble steps for an intimate mixing of substances

added components.

  Another object of the invention is to provide a mixing apparatus which is filled with liquid, the addition of substances causing the progression

  through the device and the discharge for a user

tion.

  Other goals and features

  gers of the invention will emerge from the description

and claims.

  The nature and characteristics of the

  will be better understood when reading the

  description which follows, with reference to the drawings

  the accompanying. Figure 1 is a schematic view of a mixing apparatus according to the invention, Figure 2 is a view showing another

  embodiment of the invention.

  Figure 1A is a schematic view of a

  another form of mixing apparatus according to the invention.

  Figure 2A is a top plan view of a preferred embodiment of a mixing apparatus according to the invention, part of the lid

  being torn off to show the inside.

  Figure 3A is a longitudinal vertical section

  tudinal along line 3A-3A of Figure 2A.

  Figure 4A is a trans-

  versal along line 4A-4A of Figure 3A.

  Figures 5A is an exploded perspective view of the tank and lid shown on

Figures 1A to 4A.

  Figure 1B is a schematic view of another embodiment of a mixing apparatus

according to the invention.

  It will be realized, of course, that the description

  tion and the drawings are given purely as e-

  xample and that different modifications and variations can be made to the described structure without

depart from the scope of the invention.

  Identical reference numbers designate

  identical parts on different views.

  Referring now more particularly to Figure 1 which shows an embodiment

preferred embodiment of the invention.

  A supply connection 10 for a carrier liquid is provided, which can extend to a transparent bottle or other suitable container 11 to observe the presence of liquid from the supply connection 10. The nature of the carrier liquid will be determined by the substances to be added -7-

  and the end use to make the liquid mixture.

  For many applications, the carrier liquid will be water and will be the main constituent for some applications, but the mixing apparatus is not limited in its use for this particular liquid. Other carriers, including liquids

  organic, can be used.

  The container It is connected by a connection

  12 to a pump 13. The pump 15 can.

  It may be of any suitable type to deliver a metered quantity of the carrier liquid. For this purpose, a positive displacement bellows pump having an adjustable stroke to determine the metered quantity of liquid will be used for applications where a metered quantity of a few liters is provided. The pump 13 has a delivery connection 14 to a

  first container or mixing bottle 15.

  A first feed tank 20 is provided for a first chemical substance to be added and mixed, which is preferably connected by a

  such as a delivery pipe 21, by means of

  a stop valve 22 operable

  manually and a control apparatus 25 comprising

  bellow sensitive to the flow of liquid to interrupt mixing if the reservoir 20 is

  empty. Such a control apparatus for this application

  tion is shown in US Patent No.

4,118,150 on behalf of the applicants.

  The pipe 21 constitutes a feed connection

  The pump 25 may be of any suitable type to deliver a metered quantity of liquid from the reservoir 20. For this purpose, a positive displacement bellows pump having an adjustable stroke to determine the amount of -8delivered liquid can be used. The pump 25 is connected by a connector 26 to the first mixing container 15

  and preferably at the bottom of it.

  A check valve 27 may be provided in the delivery connector 26. The first mixing container 15 is connected by a connector 28 to a second mixing container or bottle 35, and preferably to the lower part thereof. . A check valve 29 may be provided

in the delivery connection 28.

  A second feed tank 34 is provided for a second chemical substance to be added and mixed in the mixing vessel 35. The reservoir 34 is preferably connected by a connection 36, such as a delivery pipe, by the intermediate of a manually operable shut-off valve 38 and a control apparatus 39 similar to the control apparatus 23. The liquid in the connection or pipe 36 is delivered to a pump 40 which is preferably

  similar to the pump 25. The pump 40 has a connection

  cord 41, such as a pipe, going to the second mixing vessel 35 and preferably the lower part thereof. A check valve 42 can

Be provided in fitting 41.

  The second mixing vessel 35 is connected

  by a connector 43 to a third container or

  mixing dough 50 and preferably at the bottom thereof. A check valve 44 can

be provided in the fitting 43.

  A third feed tank 51 is provided for a third chemical substance to be added and mixed in the mixing vessel 50. The reservoir 51 is preferably connected by a

  connection 52, such as a delivery pipe, by the

  -9- Intermediate of a stop valve 53 operable

  manually and a similar control apparatus 54

  The liquid in the fitting or hose 52 is fed to a pump 56, which is preferably similar to the pump 25. The pump 56 has a fitting or hose 58 extending to at the fourth mixing container

  bottle 62 and preferably to the lower part

  of it. A check valve 59 can be

provided in connection 58.

  A fourth feed tank 63 is provided for a fourth chemical substance to

  add and mix in the mixing container- 62.

  The reservoir 63 is preferably connected by a connector 64, such as a delivery pipe, via a manually operable shut-off valve 65 and a control apparatus 66 similar to the control apparatus 23. The liquid in the fitting or pipe 64 is delivered to a pump 68, which is preferably to the pump 25. The pump 68 has a fitting or pipe 69 extending to the fourth mixing vessel 62 and preferably at the lower part of it. A check valve 70 can

be provided in fitting 69.

  The mixing container 62 is preferably

  The invention relates to a connector 72 connected to a fluid receiver 73 which may be a reservoir, but is preferably an expandable bag. A check valve 74 and an adjustable flow control valve 75

  may be provided in the coupling 72.

  The pumps 13, 25, 40, 56 and 68 may be driven in any suitable manner, but it is preferable to provide a motor 77 with a shaft 78, shown schematically in dashed lines,

  to drive all pumps simultaneously.

  The motor 77 is equipped with a controller 79

  for purposes that will be explained later.

  To ensure proper agitation to intimately mix and disperse small amounts

  chemical substances introduced into

  mixing heads 15, 35, 50 and 62, each of these containers is equipped with a suitable stirrer. For this purpose, each of the mixing containers 15, 35, 50 and 62 may be equipped with a motor driven recirculation pump 80 with feed connections and

  return of fluid 81 and 82 at the base of each

  mixing container, the return fittings being preferably angularly disposed inside the containers for greater agitation, The motors of the pumps 80 are preferably connected by an excitation connection 84 from the controller 79 by means of a timer relay 85 to allow a continued operation of the pumps 80 moved by motor even if other parts of the apparatus ort

been arrested.

  The fluid receiver 73 is connected to a

  delivery channel 88 preferably by means of

  intermediate of an adjustable throttle valve 89 and a check valve 90, for use of the resulting fluid with the respective additives

  intimately mixed and distributed in this one.

  The fluid receiver 73 has pre-

  a control element responsive to its state of filling, such as a microswitch 92 which is connected by a conductor 93 to the controller 79 of the engine to stop the engine 77 when a sufficient amount

  fluid is available in the fluid receiver.

from 73.

  The liquid presence control elements 23, 38, 54 and 66 are connected by a conductor 94 to the engine controller 79 to stop the engine.

  77 in the case of exhaustion of chemical substances

  in any of the feed tanks

20,34,51 and 63.

  The operating mode of the

  mixture of Figures 1 to 5 will now be explained.

  The carrier liquid is delivered by the

  intermediate of the supply connection 12 to the pump 13, which delivers a metered quantity of carrier material via the hose 14 to the first mixing container 15. The contents of the container 15 are kept in a state of permanent stirring by its pump 80

driven by motor.

  The first chemical in liquid form to be added from the first feed tank 20 is delivered via the delivery pipe 21 through the valve 22 and the control unit 23 to the pump 25. This liquid delivered from the pump 25, as determined by the setting thereof, is delivered via the fluid delivery connector 26 to the container 15 and the stirred liquid therein. The liquid from the container 15 progresses, due to continuous additions thereto, through the fluid connection into the interior of the second container.

  mixture 35 and in the liquid therein. The con-

  The container 35 is held in a permanent stirring chamber by the motor driven pump 80. A second chemical in liquid form from the second feed tank 34 is delivered via the pipe 36, the manual shutoff valve 37 and the liquid presence control 38 to the pump 40. The metered amount of this liquid delivered from the pump 40, as determined by the adjustment thereof, is delivered through the pipe 41 into the second mixing vessel 35.

  and in the agitated liquid therein.

  A third chemical substance in form

  liquid from the third feed tank

  51 is delivered via the hose 52, the manual shutoff valve 53 and the liquid presence control 54 to the pump 56. A metered quantity of this liquid, delivered by the pump 56 as shown in FIG.

  determined by the adjustment of the latter, is

  driven through hose 57 to the third

mixing container 50.

  A fourth chemical substance in form

  liquid from the fourth fuel tank

  63 is delivered through the pipe 64, the manual shutoff valve 65 and the liquid presence control 66 to the pump 68. A metered amount of this liquid delivered by the pump 68, such as

  determined by the adjustment of the latter, is

  driven through the pipe 69 to the fourth

mixing container 62.

  The liquid from the fourth container.

  mixture 62 is delivered through the connector 72, controlled by the adjustable flow restricting valve 75, to the fluid receiver 73 for

  deliverance through channeling

88.

  It will be noted that the deliveries in

  Feeders 20,34,51 and 63 -13- are controlled by the valves 22,37,53 and 67, respectively. The absence of liquid available in the supply tanks 20, 34, 51 and 63, as determined by the controllers 23, 38, 54 and 66, causes a stop 77 by means of the motor control 79 in the case exhaustion of the contents of any of these feed tanks

  and thus avoids the waste of chemicals.

  It will also be noted that the pumps 13, 25, 40, 56 and 68, preferably all entrained together by the motor 77, are controlled

  also by the microswitch 92, but with a

  maintaining the operation of the motor-driven pumps 80 after the motor 77 has been cut to maintain agitation in the

mixture 15, 35, 50 and 62.

  Referring now to Figure 2, the structure shown therein is similar to

  previously described except that the measuring containers

  15,35,50 and 62, previously shown as separate containers are combined in a tank, with a set of partition walls 101,

  102 and 103, separating a mixing chamber assembly

  ge 15a, 35a, 50a and 62a, and with a lid 104 at the top. The partition walls 101, 102 and 103 have apertures 105, 106 and 107 for progressing the liquid respectively through the mixing chambers 15a, 35a, 50a and 62a for delivery, as previously via a

fitting 72.

  The carrier liquid is delivered, as aupa-

  by means of a connector 14 with the first added chemical substance delivered from the feed tank 20 via the

  connection 26 to the mixing chamber 15a.

  The chemical substances from the feed tanks 34, 51 and 63 are delivered

  to mixing chambers 35a, 50a and 62a through

  41,57 and 69, respectively.

  The operating mode is essentially the same as that described with reference to FIG. 1 with successive progression through the mixing chambers 15a, 35a, 50a and 62a through the openings, 106 and 107, with agitation of the liquid in

  each of the mixing chambers to provide a

  adequate mixture and distribution of added substances. The mixing apparatus shown on the

  Figures 1 and 2 is filled with liquid for a function

correctly.

  Referring now more particularly to Figure 1A which shows a schematic view of

  the invention, Figures 2A through 5A, inclusive,

  trant the details of the mixing tank 20 '.

  A supply connection 10 'for a carrier liquid is provided which can extend through a heating vessel 11' having a heating coil 12 'therein with an immersion thermocouple

  13 'connected to it, up to a controller

  14t and up to a suitable source of electrical energy to maintain the liquid temperature at the desired level. A thermometer 15 'carried by the lid 16' of the tank 11 'allows a visual observation of the temperature of the liquid in the tank 11'. The tank 11 'is preferably connected to a

  transparent bottle or other container 17 '

  pri4 to observe the presence of liquid from

  supply connection 10 '. The nature of the carrier liquid and the temperature at which it will be

  maintained will be determined by the substances to be added

  ter and the final destination of the liquid mixture.

  For many applications, the carrier liquid will be water, and will be the main constituent for some applications, but the mixing apparatus is not limited in its use to this liquid

  particular. Other carriers, including liquid

  organic, can be used.

  The container 17 'is connected by the connector 10i to a pump 189. The pump 18' can be of any suitable type to deliver a metered quantity of the carrier fluid, For this purpose, a positive displacement bellows pump having a stroke adjustable to determine the metered amount of liquid will be used for applications in which a metered quantity of a few liters is provided. The pump 18 'has a delivery connection 19' to

mixing tank 20 '.

  A first feed tank 25 'is provided for a first chemical to be added and mixed which is preferably connected by a

  connection, -bel that a delivery pipe 26 'by the in-

  intermediate of a stop valve 27 'operable

  manually and a controller 28 'com-

  taking a sensitive bellows to the flow of liquid for

  interrupt a mixture if the reservoir 25 is empty.

  An appropriate control device for this purpose is

  represented in US Patent No. 4,118,150.

  The pipe 26 'constitutes a feed connection

  for a pump 30 '. The pump 30 'can be of any suitable type to deliver a

  quantity of linuide from the tanker

see 25.

* For this purpose, a bellows pump with

  -16- positive with an adjustable stroke to determine

  the quantity of liquid delivered can be used.

  The pump 30 'is connected by a delivery connection

  31 'at a specific location in the mixing tank

  age 20 '. A second feed tank 34 'may be provided for a second chemical to be added and mixed in the mixing tank. The reservoir 34 'is preferably connected by a connection 36', such as a delivery pipe, via a stop valve, 7 'operable

  manually and a similar control apparatus 38 '.

  to the control apparatus 28 '. The liquid in the fitting or pipe 36 'is delivered to a pump 40' which is preferably similar to the pump 30 '. The pump 40 'has a connector 41', such as a pipe, at a predetermined location on the mixing tank 20 '. A check valve 42 '

  can be provided in the pipe 41 '.

  A third feed tank 45 'may be provided, if desired, for a third chemical substance to be added and mixed in the mixing tank 20. The reservoir 45' is preferably connected by a connector 46 ', such as a delivery pipe, via a manually operable shut-off valve 47 'and a control apparatus 48', similar to the control apparatus 28 '. The liquid in the fitting or pipe 46 'is delivered to a pump 49', preferably

  similar to the pump 30 '. The pump 49 'has a -

  fitting or pipe 50 'extending to a location

  predetermined manner on the mixing tank 20 '.

  A check valve 51 'can be provided in the

fitting 50 '.

  A fourth feed tank 55 'may be provided, if desired for a fourth chemical to be added and mixed in the mixing tank 20'. The reservoir 55 'is preferably connected by a connection 56', such as a delivery pipe, via a valve

  stop 57 'manually operable and a

  control wheel 58 ', similar to the control device

  The liquid in the connector or hose 56 'is delivered to a pump 59' which is preferably similar to the pump 30 '. The pump 59 'has a fitting or hose 60' extending up to

  a predetermined location on the reservoir of

  lange 20 '. A check valve 61 'can be provided

in the connection 60 '.

  The number of feed tanks and associated structures can be increased or decreased,

  at will, and to receive particular substances

  to be incorporated in the liquid finally obtained.

  The mixing tank 20 ', as shown in FIG.

  2A, 3A, 4A, and 5A, preferably have side walls 65 'and 66', end walls 67 'and 68', a bottom wall 69 'and an upper cover 70'. The top cover 70 'has a groove 71' with a gasket 72 'for contact with the upper edges of the walls 65', 66 ', 67' and 68 '. Screws 73 'engaged in threaded bosses 74' removably retain the top cover 70 'in a hermetic manner on

the tank 20 '.

  The tank 20 'has a set of fixed partition walls arranged internally 76', 77 ', 78' and 79 ', parallel to the end walls.

  67 'and 68', extending between and fixed at

-18-

  65 'and 66' and the bottom wall 69 'of the

  20 ', the partition walls 76', 77 ', 78'

  and 79 'each extending up to the neck

70 'circle.

  The lid 70 ', as shown in detail in FIG. 5A, has a tubing 80' mounted thereon with a downwardly extending tube 81 communicating with the interior of the tubing 80 'for delivery down from liquid substances, as explained hereinafter, in a chamber A. The tube 81 ', moving upwardly from the base thereof, has a horizontal plate 83' attached thereto at about one-third of the distance between the wall 69 'and the cover 70', measured from the bottom wall 69 ', the plate 83' having its side edges spaced apart from the end wall 67 'and adjacent portions of the side walls 65' and 66 '

  to allow a liquid to move from one

  right A below the plate 83 'to a place

  communicating A 'above the plate 83'.

  The space limited by the wall 67 ',

  adjacent walls 65 'and 66' and the partition wall 76 'constitutes a mixing space or space at A, below the plate 83',

  for introduction and mixing of the liquid

  delivered by the pump 18 'via

  a delivery connection 19 ', and a first subset

  chemical substance to be added, delivered by the pump 30 '

  via a delivery connection 31 '.

  Storage space or location A ', above

  of the plate 83 ', receives the liquid coming from the

placement A.

  The lid 70 'has vertical walls

  shims extending down 85 ', 86', and 87 ', fixed

  to this one, ending above the inferior wall

  69 'of the tank 20', each having a horizontal plate 88 ', 89' and 90 'attached thereto spaced from the bottom wall 69' of the tank 20 ', and arranged at about one third of the distance between the wall 69 'and the cover 70', measured since

bottom wall 697.

  A connector 92 'is provided at the base of the space A for liquid withdrawal and a return fitting 93' extending above the bottom wall and having a set of nozzle openings 93a '. directed to the wall 76 'in the space A, for a return of liquid for stirring

  in space A for a mixture. A 95 'pump

  born by electric motor is preferably interposed

between the connectors 92 'and 93'.

  The wall 85 is spaced from the wall 76 'and kept spaced by converging walls 96' extending downwards (see FIG. 4A) attached to the wall.

  wall 76 ', and spaced at the base for a connection 98'.

  The top cover 70 'has a slot 43' overlapping the upper edge of the wall 76 'which is covered with a plate 44' attached to the top cover 70 ', to avoid a transfer of air or gas to the next space and can be connected to the air

free if you wish.

  The top cover 70 'has the

  delivery cord 41 'extending therethrough for delivery of liquid into the liquid passing through the slot 43t above the upper edge of the wall 76' and into the top of the space between the walls 76 'and 85' and the converging walls 96 'for downward movement to the wall

  lower 69 'to the connection 98'. The lower part

-20-

  location B is also in communica-

with connection 98 '.

  The connector 98 'is connected via a motor-driven pump 99' to a return fitting 100 'extending above the bottom wall and having a plurality of nozzle openings 100a' directed therethrough. to wall 77 'for liquid return for agitation in location B for mixing. The plates 88 ', 89' and 90 ', like the plate 83', preferably have their side edges spaced from the side walls 65 'and 66' and

  separation 77 ', 78' and 79 'respectively, for

  put a rising flow from the slots

  respective B to B ', C to C'and D to D'.

  The walls 77 'and 86' and 78 'and 87' have

  tooth of the walls converging down 96c 'and 96d'

  similar to the walls 96 'with connections of deli-

  higher fluid 50 'and 60', fittings

  lower fluid withdrawal 103 'and 104'

  as with locations C and D, and fluid return fittings 105 'and 106' with nozzle apertures 105a 'and 106a' directed to the walls 78 '

  and 79 'and pumps 109' and 110 'driven by

interposed.

  The top cover 70 'has a slot 52' and a plate 53 'attached to the top cover' and covering the slot 52 'above the wall 77', similar to the slot 43 'and the plate 44', a slot 62 'and a plate 63' attached to the top cover 70 'above the wall 78' and a

  slot 54 'and a plate 65' above the wall 79 '.

  Slots 52 ', 62' and 54 'function in an analogous manner.

logue to the slot 43 '.

  A collection and storage location E-21- is provided inside the tank 20 'bounded by the partition wall 79', the end wall 68 'and adjacent portions of the side walls 65'

  and 66 ', and to which liquid is delivered by the

  intermediate of the slot 54 'above the upper edge of the partition wall 79'. Location E has a fluid delivery connector 112 'in communication therewith for delivery of

  mixed substances for use.

  The lid 70 'has a pipe 1141 connected thereto which is in communication with a receiver 115', preferably an expandable chamber and which may be a bag, for the delivery of gas or steam trapped at the location E at the receiver 115 'when the level at the location E rises, and for the return of gas or steam

  imprisoned when the level drops.

  In the interior of the slot E, a vertical guide tube 116 'is provided having a float 117' on the inside with a magnet 118 'carried by the

  float 117 '. Proximity proximity switches

  and lower 119 'and 120' are provided, responsive to the magnet 118 'for a low level closure and a high level opening as determined by the position of the float 118'. The switches 119 '

  and 120 'are connected by a conductor 126' to a con-

motor throttle 122 '.

  Pumps 18 ', 30', 40 ', 49' and 59 'can be entrained in any suitable manner, but it is preferable to provide an electric motor.

  121 'having a controller 122' with a shaft 121a ',

  schematically presented in dotted lines, to train

  simultaneously all the pumps.

  The presence control elements of

  28 ', 38', 48 'and 58' are connected by a conductor

  1231 to the motor controller 122 'to stop the

  121t in the case of exhaustion of substances

  in any of the feed tanks

  25 ', 34', 45 'and 55' to avoid waste

of chemical substances.

  To ensure adequate agitation to intimately mix and disperse small amounts of chemicals introduced to locations A, B,

  C and D, circulation pumps driven by

  95 ', 99', 109 'and 110' are preferably connected

  by an excitation link 123 'coming from the contr8-

  their motor 122 'via a timer relay 124' to allow continued operation of the motor-driven pumps 95 ', 99', 109 'and 110', even if other parts of the apparatus

have been arrested.

  The mode of operation of the embodiment of the invention shown in the Figures

  1A to 5A, inclusive, will now be explained.

  The carrier liquid, heated if desired and at the desired temperature, is delivered via the connection 10 'to the pump 18' and thence to the closed mixing chamber 20 ', the pump 18' delivering a metered amount of carrier liquid, through the pipe 19 ', the tubing 80' and the pipe 81 ', at the first mixing location A while a metered quantity of the first chemical to be added from the first reservoir 25 'is supplied by the pump 30', as determined by its adjustment, to the tubing 'and the pipe 81' at the first mixing location A. Stirring is provided by the driven pump 95 '

by motor.

  -23- Liquid from slot A

  progresses beyond the plate 83 'to the location

  A 'and, due to the addition of carrier liquid and the first chemical additive, passes through the slot 32t above the upper edge of the wall of

Separation 76 '.

  A second chemical substance in liquid form from the second feed tank 34 'is delivered, via the delivery pipe 36', from the manual stop valve 37t and

  of the liquid presence control 38t, at the pump 40 '.

  A metered quantity of this liquid is delivered by the pump 40 ', as determined by the adjustment thereof, is delivered by the pipe 41' to the space limited by the walls 76 ', 85' and 96 'and is moves downwardly therein with the liquid also delivered into this space from the location B and passes through the connection or pipe 98t, under the action of the suction of the motor driven pump 99 ', and is brought back through the pipe 100 'into the location B, the pipe 100', like the other return pipes, having nozzle openings 100a 'directed towards the wall 77' for agitation of the liquid at the location B. The liquid from location B progresses past plate 88 'to location

  B ', and passes through the slot 52' above the upper edge.

  of the partition wall 77 '.

  A third chemical substance in liquid form from the third feed tank 45 'is delivered via the hose 46',

  the manual shut-off valve 47 'and the pre-control

  48t liquid, at the pump 49 '. A quantity

  of this liquid, delivered by the pump 49 ', such

  determined by the adjustment of the latter, is

  It is connected by the pipe 50 'to the space limited by the walls 774' and 86 'and the walls 96c' and moves downwards therein, where liquid is also delivered from the location C and crosses the connection or pipe 103 ', under the action of the suction of the pump 109' driven by motor, and is brought back through the pipe 105 'in the location C,

  the pipe 105 'as the other return pipes, pos-

  from nozzle openings 105a 'directed towards the

  wall 78 'for agitating the liquid at the location

C.

  The liquid from location C pro-

  gresse beyond the plate 89 'to the location C and cross the slot 52'- above the upper edge of

the partition wall 78 '.

  A fourth chemical in liquid form from the fourth feed tank is delivered through the hose 56 ', the manual shutoff valve 57', and the liquid presence check 58 '.

  at the pump 59 '. A metered quantity of this liquid, deli-

  pumped by the pump 59 ', as determined by the adjustment thereof, is delivered by the pipe 60' to the space limited by the walls 78 'and 87' and the walls

  96d 'and moves downwards o the liquid is also

  issued from location D and

  pour the connection or pipe 104 'under the action of aspira-

  of the motor-driven pump 110 'and is brought back through the pipe 106' into the location D, the pipe 106 ', like the other return pipes having nozzle openings 106a' directed towards the wall 79 'for a agitation of the liquid at location D. Liquid from location D

  progresses beyond the plate 90 'to the location

  D 'and passes through the slot 62', above the edge t464740 -25-

  upper partition wall 79? and in the

  E. The cover 70 'has a connector 114' extending from the top of the space E to the expandable chamber 115 'for a gas transfer

  to and from chamber 115 'to absorb

  the fluctuation of level in the space E. The delivery connection 112 'extends from the space E for a delivery of the mixture with a view to a

use.

  It will be noted that the deliveries from tanks 25 ', 34', 45 'and 55' are controlled by

  the valves 26 ', 36', 46 'and 56i, respectively.

  The lack of liquid available in the tanks

  25 ', 34', 45 'and 55', as determined by

  born by the controllers 28 ', 38', 48 'and 58', causes the engine 121 'to stop by means of the control 122' in the event of the exhaustion of the contents of any one of these storage tanks. 'food

  and thus avoids the waste of chemicals.

  It will be noted that pumps driven by

  motor 85 ', 99', 109 'and 110' are controlled by the

  driver 123 'and the timing relay

  124 'to continue the agitation in the

  these A, B, C and D for a predetermined time for a

correct mixture.

  The level in the space E, as determined by the positioning of the float 117 'with its magnet 118' in connection with the proximity switches 119 'and 120' via the conductor 126 also controls the stopping of the motor 121 when the float 117 'is in its upper position and causes operation when the float 117'

  is in its lower position.

-26-

  Referring now more specifically

  to the embodiment of the invention represented by

  In FIG. 1B, a supply connection 10 "for a carrier liquid is provided which is preferably connected to a transparent bottle or other container.

  appropriate to observe the presence of

  The nature of the carrier liquid will be determined by the substances to be added and by the definite use of the liquid mixture: for many applications, the carrier liquid will be water, and will be the main constituent for some applications, but the mixing device is not limited in its

  use to this particular liquid. Other por-

  including body fluids, may be used. The container 11 "is connected by the supply connection 10" to a pump 12 "The pump 12" can be of any suitable type to deliver a metered quantity of the carrier liquid. For this purpose, a positive displacement bellows pump having an adjustable stroke to determine the dosed amount of liquid will be used for applications where a metered quantity of liters is provided. Well

  only one pump 12 "is shown, if it is

  sire and if this is necessary to deliver a

  adequate quantity of the carrier liquid, several

  pes 12't can be used or a pump more

  suitable for use can be used

  See. The pump 12 "has a delivery connection 13". A first feed tank 15 "is provided for a first chemical substance to be added and mixed, which is preferably connected by means of a feedstock.

  connection, such as a delivery pipe 16 ", by the

  a 17 "shut-off valve

  manually and an 18 "1 control

  taking a sensitive bellows at a liquid flow rate to interrupt mixing if the reservoir 15 "is empty A suitable control apparatus for this purpose is shown in US Patent No. 4,118,150

on behalf of the applicants.

  The pipe 16 "constitutes a feed connection

  The pump 20 "may be of any suitable type for delivering a metered quantity of liquid from the tank 15." For this purpose, a positive displacement bellows pump having an adjustable stroke for the quantity of liquid delivered can be used The pump 20 "is connected by a delivery connection 21" by

  via a check valve 22 "to a first

  first fluid connection 23 "which connects a first outlet or delivery connection 24" of a first rotary pump 25 ", driven by a motor 26", to the suction connection 27 "of the pump 25". The connection 13 "is also connected to the circulating fluid connection 23" for introduction of the liquid

carrier in the fitting.

  An upstream withdrawal 28 "is provided for delivery of liquid from the first fluid connection 23" to a second fluid connection.

  circulating fluid 30 "which connects a coupling of

  or delivery 34 "of a second rotary pump

  35 ", driven by a 36" motor, to the suction fitting

37 "of the pump 35".

  A second 40 "feed tank can

  be provided for a second chemical substance to be added

  mix and mix in the 35 "pump and its fitting.

circulating fluid 30 ".

  The reservoir 40 "is preferably connected by a connection 41", such as a delivery pipe, by

  via a stop valve 42 "and an ap-

  control device 43 ", similar to the control unit 18". The liquid in the connection or pipe 41 "is delivered to a pump 44" which is preferably similar to the pump 20. The pump 44 "has a connection 45", such as a pipe, up to a downstream withdrawal on the second fluid connection in

  30 "circulation. A check valve 46" can be pre-

seen in the pipe 45 ".

  An upstream withdrawal 48 "is provided for delivery of liquid from the second circulating fluid connection 30" to a third circulating fluid connection 50 "which connects a fluid connection.

  output or delivery 54 "of a third rotary pump

  55 "drive, driven by a 56" motor to the

suction 57 "from pump 55".

  A third reservoir of chemical substance

  "may be provided, if desired, for a third

  me chemical substance to add and mix in pump 55 "and in its fluid connection in circulation". The reservoir 60 "is preferably connected by a

  61 "connection, such as a delivery pipe, by means of

  a stop valve 62 "operable

  manually and a control device 63 ", similar to

  to the control unit 18 ".

  The pump 64 "is supplied to a pump 64", which is preferably similar to the pump. "The pump 64" has a fitting or pipe 65 "extending to a downstream draw on the third fitting. circulating fluid 50 ". A check valve

  retainer 66 "can be provided in fitting 65".

  Upstream withdrawal 68 "is provided for delivery of liquid from the third circulating fluid connection 50" to a fourth circulating fluid connection 70 "1 which connects an outlet or delivery connector 74" of a fourth 75 "rotary pump driven by a 76" motor

suction pump 77 "of pump 75".

  A fourth feed tank 80 "may be provided, if desired, for a fourth chemical substance to be added and mixed in the

  75 "pump and in its circulating fluid connection

70 ".

  The reservoir 80 "is preferably connected by a connection 81", such as a delivery pipe,

  through a stop valve 82 "action-

  manually and a control apparatus 83 ", similar to the control apparatus 18". The liquid in the connection or pipe 81 "is delivered to a pump 84" which is preferably similar to the pump 20. The pump 84 "has a connection or pipe 85" extending to a downstream withdrawal on

  the fourth circulating fluid connection 70 ".

  A check valve 86 "can be provided in the connection 85". The fourth connection 70 "1 has an upstream withdrawal 88" for a delivery of the liquid

mixed for use.

  The number of feed tanks and associated structures can be increased or decreased,

  if desired, to receive the particular substances

  to be incorporated in the mixed liquid finally obtained

naked for use.

  Pumps 12 ", 20", 44 ", 64" and 84 "can be driven in any suitable manner, but it is preferable to provide an electric motor -30-" having a motor controller 91 "with a shaft 92 ", shown schematically in dotted lines, for

  simultaneously drive all the pumps.

  The liquid presence control elements 18 ", 43", 63 "and 83" are connected by a conductor 93 "to the motor controller 91" to stop the motor 90 "in the case of exhaustion of the substances.

  in any of the feed tanks

  15 ", 40", 60 ", and 80" to avoid waste

of chemicals.

  26 ", 36", 56 "and 76" motors for pumps

  25 ", 35", 45 "1 and 75" are preferably connected by an excitation link 94 "from the controller of

  91 "motor via a timer relay.

  95 "to maintain pump operation

  driven by 25 ", 35", 55 "and 75" motors, even if

  many parts of the aircraft have been shut down.

  The mode of operation of the form of

  embodiment of the invention shown in FIG.

* will now be described.

  The system preferably works as a

  that system filled with liquid free of gas or air.

  The carrier liquid is delivered through

  10 "supply connection to pump 12" and from there through hose 13 "to the first

  circulating fluid 23 "and the first rotary pump

  25 ", the pump 12" delivering a metered quantity of carrier liquid. Simultaneously, a metered quantity of the first chemical substance to be added from the first feed tank 15 "is delivered by the pump 18" 1 as determined by the setting

  of this, through the connection of deli-

  21 "at the first fluid connection in circulation.

23 ".

-31-

  The carrier liquid is delivered through

  median of the 13 "pipe and the first chemical substance.

  is delivered through the pipe 21 "in the first structure

  stirring and mixing element comprising the first rotary pump 25 "and the first circulating fluid connection 23" from the pump outlet 24 "to the suction connection 26". The rapid and permanent circulation and the turbulent nature of the liquefied flow in the absence of air causes a mixture of the respective constituents. If the engine 26 "is one tenth of a chelael, operating at about 2000 revolutions / minute, and if the pump 25 "and the fitting 23" have a capacity of about

  one to two liters, the liquid will pass through the sen-

  Sibly closed pump 25 "t and fitting 23" about 16 times per minute with stirring shocks

  multiple by the fins of the pump 25 ".

  The introduction of measured quantities of liquid

  carrier and the first chemical substance by pulsing causes a displacement of the same quantities through the withdrawal 28 "and in the second connection of circulating liquid 30",

  In the second, third and fourth cycles

  keys, in the second, third and fourth pumps

  35 "'55" and 75 "rotary presses with their liquid connections.

  circulating 30 ', 50 "and 70", the action previously

  described is repeated with chemical substances

  complementarily delivered by the delivery connections 45 ", 65n and 85", and with

  progression from cycle to cycle by introduc-

  additional liquid supply and delivery of the mixed liquid via the connection 88 "

for use.

  In the case of depletion of one of the known substances in the 15 ", 40" chemical reservoirs,

  "and & 0", the pumps 20 ", 44", 65 "and 84" will be

  but the 26 ", 36", 56 "and 76" motors will continue to operate for agitation and mixing for a predetermined period of time set in the relay

timing 95 ".

Claims (37)

  1, mixing apparatus, characterized in that   has a feed connection (10, 10 ") for a first   first liquid store (11, 17 ', 11 "), a member (12", 18', 13) for delivering a metered quantity of liquid from said   first supply connection (10, 10 ") to a first chamber   mixture (15, A, 25 "), a member (80, 95 ', 26") for agitating the liquid in said first mixing chamber (15, A, 25' '), a feed connection (21 , 26 ', 16 ") for a second liquid reserve (20, 25', 15"), a member (25,   ', 20' ') to deliver a metered quantity of liquid   from said second supply connection (21, 26 ', 16 ") to said first mixing chamber (15, A, 25"), and an   Liquid supply (26, 311, 21 ") connected to said first   first mixing chamber (15, A, 25 ").   Mixing apparatus according to claim 1, further characterized by a supply connection (36, 36 ') for a third liquid supply (34, 341), an   (28, 43 ') for delivering the liquid from said first   first mixing chamber (15, A) with a second mixing chamber (35, B); a member (40) for delivering a metered quantity of liquid from said third liquid supply (34, 34 ') to said second chamber of mixture (35, B),   and a member (80, 99 ') for agitating the liquid in said mixing chamber (35, B).   Mixing apparatus according to claim 1, characterized in that said member (13, 25) for delivering   a metered quantity of liquid is a pump (13, 25).   Mixing apparatus according to claim 3, characterized in that said pump (13, 25) is a pump driven by motor (77).   Mixing apparatus according to claim 3, characterized in that said pump (13, 25) is a pump bellows with adjustable flow.   Mixing apparatus according to claim 1, characterized in that said two members (13, 25) for   deliver a metered quantity of liquid are entrained   jointing. Mixing apparatus according to claim 1, characterized in that a member (23) is provided interposed between said second liquid supply (20) and said dispensing member (25) for de-energizing   said delivery member (25) during a depletion of   provided to said delivery organ (25).   Mixing apparatus according to claim 1,   characterized in that said member (80) for agitating the li-   in said first mixing chamber (15) comprises   a pump (80) driven by motor.   Mixing apparatus according to claim 8, characterized in that said stirring member (80) is a   pump (80) driven by motor connected to said mixing chamber   ge (15) for recirculating liquid inside (81, 82). Mixing apparatus according to claim 1, characterized in that said liquid delivery member (13,23) comprises a container (73) and elements (92) responsive to the amount of liquid in said container (73).   container (73) for de-energizing said member (13, 23) pouring a metered quantity.   Mixing apparatus according to claim 1, characterized in that said mixing chamber (15) is a separate container.   Mixing apparatus according to claim 1, characterized in that said mixing chamber (15) comprises a closed tank.   Mixing apparatus according to claim 2, characterized in that said two mixing chambers (15, ) are separate receptacles.   Mixing apparatus according to claim 2, characterized in that said two mixing chambers (15a,   35a) are arranged in a closed tank (100).   Mixing apparatus according to claim 2, characterized in that said mixing chambers (A, B) are arranged in tanks (20t), said second   mixing chamber (B) having an organ (43 ') for deli-   liquid is attached thereto, and a liquid storage member (E) is connected to said liquid delivery member (43 '). Mixing apparatus according to claim 15,   characterized in that it further comprises a feed connection   supplying (36 ') for a third supply of liquid (34'), a member (43 ') for supplying the liquid from said first part (A') of said reservoir (20 ') to a second part (B) of said reservoir , an organ (40) for delivering a   quantity of liquid from said third   serve as a liquid (34 ') to said second part (B) of said   reservoir (20 '), and a stirring member (99') for   from said first part (A ') of said reservation   see (20 ') and the liquid from said third reservoir ve of liquid (3! i ').   Mixing apparatus according to claim 16,   characterized in that a member (28 ', 38') is provided,   placed between said liquid reserves (25 ', 34') and said member for delivering a metered quantity for the purpose of de-energizing said delivery member (30 ', 40) during a depletion of   liquid supplied to said member (30 ', 40) for delivery.   Mixing apparatus according to claim 15, characterized in that said tank (20 ') comprises a tank having a set of vertical partition walls (761,   77, 78 ', 79', 85, 86 ', 87t) spaced horizontally in the direction of   to separate a set of parts (A, A ', B, B', C, C ', D, D', E) containing a liquid.   Mixing apparatus according to claim 18, characterized in that said reservoir (20 ') has a bottom wall (69') and at least some of said partitions (76t, 77, 78t, 79 ') extend upwards from said wall lower (69 ').   Mixing apparatus according to claim 18,   characterized in that said reservoir (20 ') has a neck   upper vane (70 ') and at least some of said partition walls (85, 86', 87 ') extend downwardly from said upper cover (70'). Mixing device according to Claim 18, characterized in that horizontal baffles (831, 88 ', 89', 90 ') are provided in each of the parts containing   liquid (A, A ', B, B', C, C ', D, DI).   22. Mixing apparatus according to claim 19, characterized in that said tank has a lid   (70 ') and at least some of the separating walls   (85, 86 ', 87') extend downwardly from said neck   upper ring (70 ') spaced from said separating walls   extending upwardly (76 ', 77, 78', 79 ').   23. Mixing apparatus according to claim 22, characterized in that supply connections (41 ', 50', ') for a liquid supply are connected to the gap (96, 96c', 96d ') between a contiguous pair of partition walls extending upward (76 ', 77, 78', 79 ') and down (85, 86 ', 87').   Mixing apparatus according to claim 22, characterized in that delivery connections (43 ', 52', 62 ', 54') are provided which communicate with the space (96, 96c ',   96d ') between a contiguous pair of partition walls se-   tending upwards (76 ', 77, 78', 79 ') and down (85,   86, 87 ') and a space (A,;', B, B ', C, C', D, D ', E) containing   adjacent liquid in said reservoir (20 ') for a withdrawal of liquid from it.   3é Mixing apparatus according to claim 24, characterized in that a pump (95 ', 991, 109', 110 ') is provided connected to each of said delivery connections (431, 52', 62 ', 54'). for returning liquid to said adjacent space (AI, B ', C', D ') containing a liquid for agitation liquid in said space.   26. Mixing apparatus according to claim 16, characterized in that a stirring member (95 ', 99', 109 ', t) is provided for stirring the liquid in said reservoir (20') as a result. the addition of an additional supply of liquid. 27. Mixing device according to claim 16 characterized in that said liquid storage member (E) comprises a receiving chamber (E) and has, associated with it, a member (117 ') sensitive to the liquid level.   in said receiving chamber (E) to cause the action   said organ (40) delivering a metered quantity of   quide. 28. Mixing apparatus according to claim 16, characterized in that said member (E) for storing liquid has a receiver (114 ') of gaseous fluid connected thereto for the reception of gaseous fluid during an elevation of   fluid level in said fluid storage member (E)   quide and for a return of gaseous fluid during the decline   the level of liquid in said storage member.   Mixing apparatus according to claim 1, characterized in that a mixing member is provided in which said first mixing chamber (25 ") comprises a rotary pump (25") with a first fluid connection (23 "). in circulation connecting the delivery (24 ") and suction (27") portions of said rotary pump (25 ") for permanent circulation of liquid, a member (12") for delivering dosed amounts of liquid from said first supply connection (10 ") to said mixing member, a member (20") for supplying metered quantities of liquid from said second supply connection (16 ") to said mixing member, and a delivery connection (28 ") for the liquid from said mixing member, the amounts of liquid supplied from said supply connections (10", 16 ") displacing a comparable amount of liquid from said first mixing member.   Mixing apparatus according to claim 29,   characterized in that it further comprises a feed connection   (41 ") for an additional delivery of liquid, a member (28") for delivering liquid from said mixing member to a second mixing member which comprises   a second rotary pump (35 ") and has a second   circulating fluid cord (30 ") connecting the delivery (34") and suction (37 ") portions of said second rotating pump (35") for permanent liquid circulation, a member (44 ") ) to deliver a metered quantity of liquid from an additional reserve of liquid   (40 ") to said second mixing member and a delta connection   supply (48 ") for the liquid from said second mixing member, the quantities of liquid delivered by said   supply connections (10 ", 16", 4! 1 ") moving a quantity   comparable liquid source from said mixing member. Mixing apparatus according to claim 30, characterized in that each of said members (12 ", 20", 44 ")   delivering a metered quantity of liquid is a pump.   Mixing apparatus according to claim 30,   characterized in that a member (18 ", 43") is provided,   placed between said liquid reserves (15 ", 40") and said members (20 ", 44") delivering a metered quantity to de-energize said delivery member (20 ", 44") during the exhaustion of   liquid supplied to said organ (20 ", 44") for delivery.   Mixing apparatus according to claim 30, characterized in that at least one of said members (12 ", 20", 44 ") delivering said dosed amounts of liquid is connected   to said connection (23 ", 30") of circulating fluid.   34. The mixing apparatus according to claim 30, wherein said two members (12 ", 20", 44 ") delivering   said dosed amounts of liquid are connected to said   cord (23 ", 30") of circulating fluid.   Mixing apparatus according to claim 30, characterized in that said delivery connection (28 ", 48")   is connected to said circulating fluid connection (23 ", 30").   36. Mixing apparatus according to claim 30,   characterized in that a member (18 ", 43") is provided,   placed between said second supply connector (16 ") and said additional liquid supply connector (41") and said units (20 ", 44") delivering metered quantities for de-energizing said delivery members (20 ", 41"); ";") when liquid is supplied to said members (20 ", 44") delivering dosed quantities.   37. Mixing apparatus according to claim 36, characterized in that a control member (95 ") is provided   to maintain the operation of those first and second   conde rotating pumps (25 ", 35") for a predetermined time interval when de-energizing said organs   (20 ", 44") delivering dosed amounts.