FR2536471A1 - PUMP FOR DELIVERING MULTIPLE DIFFERENT PRODUCTS IN WELL-DEFINED PROPORTIONS - Google Patents

Abstract

THIS PUMP IS CONSTITUTED BY A SINGLE CYLINDER WHOSE PISTON 1, IN ITS DISCHARGE STROKE, SLIDES SIMULTANEOUSLY, AND OF THE SAME QUANTITY, A NUMBER OF PISTON 2, 6 EQUAL TO THAT OF THE MIXTURE CONSTITUENTS, PISTONS WHOSE DIPORAMETERS ARE PROPORTIONAL AT THE DESIRED FLOW FOR EACH OF THESE CONSTITUENTS IN CYLINDERS 9, 10 ALLOCATED TO EACH OF THEM, THE SUITABLE QUANTITIES OF WHICH MAY ESCAPE TOWARD THE POINT OF USE. IT ALSO INCLUDES MEANS SUCH THAT THE SLIDING OF THE PISTON OF THE CYLINDER IN THE DIRECTION OF THE DISCHARGE CAN ONLY BE CONTROLLED IF ALL THE CYLINDERS AFFECTED TO EACH OF THE COMPONENTS OF THE PRODUCTS TO BE MIXED ARE COMPLETELY FILLED IN PRELIMINARY. THE DISCONNECTION OF PISTON 2 FROM THE CYLINDER AND 5, 6 OF THE CYLINDERS 9, 10 CONTAINING THE PRODUCTS TO BE MIXED OCCURS AUTOMATICALLY FROM THE BEGINNING OF THE RETURN STROKE OF THE PISTON 2 OF THE CYLINDER 1.

Description

l 2536471 It often happens that we have to charge in proportions

  well defined several different products which, such as polymerizing compounds by action of reagents, paint or adhesive for example, cannot be mixed in advance, but only at the time of their use. To obtain this result, it is known to use a single cylinder whose piston, in its delivery stroke, slides simultaneously, and of the same quantity, a number of pistons equal to that of the constituents of the mixture, pistons whose diameters are proportional to the desired flow rate for each of these constituents, in cylinders assigned to each of them, the quantities of which are dosed appropriately can escape towards the point of use by pipes fitted with non-return valves, while that in

  its suction stroke the piston of the aforementioned cylinder, makes all

  slide simultaneously, and in the same quantity,

  same pistons in the cylinders assigned to each of the components

  sants, which are connected to the reserves of said components, by means of pipes fitted with non-return valve, the filling of these cylinders by suction being able to be

  accelerated by booster pumps assigned to each of them.

  However, if one of these cylinders is not whole-

  ment filled at the beginning of the delivery controlled by the piston of the jack, due in particular to the fact that the product which it contains is more viscous than the others and that the filling of the corresponding cylinder is consequently slower, it can

  cavitation phenomena such as the propor-

  tion of the product delivered by the cylinder in question is

not the one you want -

  Now it has been found, according to the present invention, that this drawback of pumps of the aforementioned known type can be avoided.

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  to deliver several different products in well-defined proportions, supplementing them by means such that the sliding of the piston of the cylinder in the direction of delivery can only be controlled if all the cylinders assigned to each of the components of the products to be mixed are fully full

beforehand.

  This result can be obtained in particular by the fact that the connection between the piston of the jack and those of the cylinders assigned to each of the components is automatically cut off at the start of the suction stroke of the jack's piston and is not re-established until after complete filling of each of these cylinders; This is how switches can be assigned to each of the pistons of the cylinders themselves assigned to the different products, these switches being arranged so that they are closed by the pistons of said cylinders, at the end of their strokes d suction, caused by the filling of their cylinders by their booster pump, and that they do not allow to control the displacement movement of the piston

  only when they are all closed.

  With such an arrangement, it is no longer necessary to slow down the suction speed of the piston of the jack to be sure that the filling of the cylinders assigned to each component takes place in a perfect manner; on the contrary, this ascent can be done at high speed and its descent controlling the simultaneous flow of the various constituents of the product in the desired proportions can start automatically, as soon as all the cylinders have been properly filled; filling time is thus reduced to a minimum and depends

  only pressures and flow rates of booster pumps.

  The attached drawing shows schematically, as

  example, an embodiment of the present invention.

  in the case where only two products must be debited

in a specified proportion.

  Figure 1 shows the pump during the emptying period.

  Figure 2 shows the same pump during the filling period. The pump shown comprises, in known manner, a cylinder in the cylinder 1 which can slide a piston 2 controlled appropriately; the sliding of this piston is integral, by its rod 3 and the coupling rod 4, with those of the two

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  pistons 5 and 6, of diameters proportional to the desired flow rates for components 7 and 8, contained in the cylinders 9 and 10 assigned to each of them The cylinders 9 and 10 are supplied, through the filling pipes 11 and 12, with the interposition of non-return valves 13 and 14, by

  unrepresented reserves of the two aforementioned constituents,

  by means of booster pumps; it is understood that, during its delivery stroke, in the direction indicated by the arrow in Figure 1, the piston 2 causes equal sliding of the pistons 5 and 6 in their cylinders 9 and 10 and, consequently, corresponding product flow rates 7 and 8, through the delivery pipes 15 and 16, with interposition of

  non-return valves 17 and 18, towards the point of use

  station. The pump according to the present invention is characterized in that it further comprises means such that the piston 2 of the cylinder 1 is automatically uncoupled from the pistons 5 and 6 of the cylinders 9 and 10 assigned to each of the products 7 and 8 from the start of its suction stroke, in the direction indicated

by the arrow in figure 2.

  In this way, the cylinders 9 and 10 can gradually and completely fill with the products 7 and 8 to which they are assigned, whatever the viscosities of these products which may be different, under the effect of pumps.

  corresponding feeding; -not shown.

  To avoid that the piston 2 of the cylinder 1 can start its delivery stroke, in the direction of the arrow shown in Figure 1, before the two cylinders 9 and 10 are fully filled, and that, consequently, one of '' they can start to flow before the other, we can use two switches 19 and 20, each assigned to one of the pistons 5 and 6, arranged in such a way that they do not allow the passage of the current controlling the stroke of delivery of piston 2 until they have both been closed by pistons 5 and 6

  at the end of their upward course caused by their filling

  wise under the effect of booster pumps.

  It is understood that the embodiment of the invention

  tion which has been described above with reference to the accompanying drawing has been given for information only and is in no way limitative 'and that many modifications can be made without

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  that we depart for this from the scope of the present invention;

  any arrangement such as the delivery is sufficient

  Placement of the piston 2 of the cylinder 1 and of the pistons 5 and 6 of the cylinders 9 and 10 can only take place when the two cylinders in question are completely filled and that, on the other hand, the uncoupling occurs automatically from the

  start of suction stroke of piston 2 of cylinder 1.

2536471

Claims (3)

CLAIMS -   1. Pump to deliver several different products   rents in well defined proportions using a single cylinder   that the piston (1), in its delivery stroke, makes   smooth simultaneously, and by the same amount, a number of   tones (2,6) equal to that of the constituents of the mixture, pistons   whose diameters are proportional to the desired flow for each   none of these constituents in cylinders (9,10) assigned to each of them, the quantities of which can be dosed appropriately   escape from it towards the point of use by canali-   sations fitted with non-return valves, while, in its suction stroke, the piston of the aforesaid jack always slides, simultaneously and in the same quantity, these same pistons in the cylinders assigned to each of the components which are connected to   reserves of said components, via pipelines   tions fitted with non-return valves, filling these cy-   lindres by aspiration which can be accelerated by pumps   force-feeding assigned to each of them, characterized in that it comprises   carries means such as sliding the Diston from the cylinder into   the direction of delivery can only be controlled if all the cycles   linders assigned to each of the components of the products to be mixed   are completely filled beforehand.   2. Pump according to claim 1 characterized in that means automatically cause the uncoupler of the piston (2) of the jack (1) and the pistons (5,6) of the cylinders (9,1 O) assigned to each of the products (7 , 8) as soon as the return stroke of said piston (2) begins and the re-coupling of these pistons occurs only after complete filling of these cylinders (9,10). 6 2536471   3. Pump according to any one of the claims.   1 and 2, characterized in that switches (19,20) assigned to each of the pistons (5,6) are arranged in such a way that they do not allow the passage of current controlling the delivery stroke of the piston (2 ) until they have both been closed by the pistons (5 and 6) at the end of their stroke   ascending caused by their filling under the effect of the pumps force-feeding pes.