FR2475152A1 - DOSING DEVICE AND PUMP FOR THIS DEVICE - Google Patents

Abstract

THE METERING DEVICE IS OF THE HYDRAULIC CONTROL TYPE. THIS 1 INCLUDES A PISTON 4 ANIMATED BY A BACK-AND-BACK MOVEMENT BY THE PRESSURE OF THE FLUID. ROD 12 OF PISTON 4 ACTS A PUMP 2 INTENDED TO PUMP THE PRODUCT TO MIX WITH THE LIQUID. THE HYDRAULIC CONTROL IS PRECEDED BY A SHUT-OFF VALVE 27 CONTROLLED SO AS TO AUTOMATICALLY INTERRUPT THE LIQUID SUPPLY WHEN THE QUANTITY OF PRODUCT IN TANK 22 IS NO LONGER SUFFICIENT. THE BODY OF THE PRODUCT PUMP 2 IS MOUNTED ON THE ROD 12 OF THE PISTON 4, AND IN RELATION TO THE HOUSING OF THE HYDRAULIC CONTROL 1 A CLEARANCE ADJUSTABLE IN THE DIRECTION OF THE ROD OF THE PISTON 4. IS SUBMITTED TO THE STROKE OF PISTON 4, THIS SET DETERMINES THE EFFECTIVE PUMPING STROKE OF PUMP 2, AND THEREFORE, THE RELATIONSHIP BETWEEN THE FLOW OF PUMP PRODUCT AND THE FLOW OF THE LIQUID, THAT IS, THE CONCENTRATION OF THE MIXTURE. USE TO CARRY OUT PRECISE DOSAGE IN LARGE QUANTITIES, WITHOUT RISK THAT THE CONCENTRATION OF THE MIXTURE IS AFFECTED BY PRODUCT EXHAUST, AND WITHOUT DEPENDING ON THE ELECTRICAL DISTRIBUTION NETWORK.

Description

The present invention relates to a controlled dosing device

  hydraulic, the latter comprising a piston driven by a back and forth movement by the pressure of the liquid,

  the piston rod actuating a product pump for

  change it to liquid in an adjustable proportion, the race

  said pump being adjustable, and the liquid

  both of the hydraulic control mixing with the product

exiting said pump.

  The present invention also relates to a pump

  produced for a metering device, in particular of the kind

  above. Such dosing devices are used to make utility dilutions of disinfectants, or to mix products such as water with water.

  detergents or flocculants, or to add

  veterinary growth products to animal feed

  ailments. For the preparation of utility solutions, mixing devices are known which operate according to the principle of the Venturi tube. The pressure created on one side of this tube acts on a rubber balloon

  is filled with concentrated disinfectant. In this

  positive, the accuracy is poor. It varies in these devices depending on the amount of product discharged and it is of course only valid for a certain viscosity. Small fluctuations in viscosity cause

  concentration differences in the utility solution.

  Measuring pumps are also known which measure

  the flow of water with a meter. This produces im-

  electrical pulses in proportion to the flow, and it electronically controls a piston metering pump that dose the supply of disinfectant. The fragility of the electrical device is important and the construction of such pumps is very complicated. Maintenance costs and dependence on the distribution grid

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are all disadvantages.

  Electrically actuated metering pumps are also known. These pumps are either diaphragm or piston. When it is necessary to make a dosage of proportions with these devices, it is necessary naturally to dose also the water.

  Except for an additional device, these pumps can not

  measure the dosage according to the water flow.

  In addition, a metering pump is known which is dis-

  placed inside a hydraulic-piston control, the body of said pump being installed inside the

  cylinder filled with water-hydraulic piston control.

  There is the disadvantage of water pollution if the dosing pump is not waterproof. Another disadvantage is that in case of interruption of the supply to the pump

  the piston hydraulic control system continues

  to make it impossible to dose quantitatively.

  The purpose of the present invention is to remedy

  disadvantages mentioned above by proposing a

  which allows precise dosing of the product to be mixed

  to the liquid, preventing any insufficiency of concen ---

  after adjusting it and avoiding an intrusion

product in the liquid.

  According to the invention, the metering device is

  characterized in that the hydraulic control is preceded by a mechanically actuable stop valve for the supply of liquid, said valve being able to assume two positions in

  depending on the quantity of product contained in a

  see product, and in that the product pump is in-

  talled outside the hydraulic control on the stem

  of the control piston, and connected to the product tank.

  This arrangement allows an automatic dosing of the

  the pre-set concentration is now

  accurately during the operation of the device.

  Since the device according to the invention stops

  mechanically of itself when the product contained in.

  the tank falls below a certain quantity,

  and because of the distance between the hydrau-

  the product pump, a leakage

  the latter does not affect the concentration of

  in the liquid, the accuracy of the assay is not affected by the disturbances that may occur in the

operation of the device.

  According to another particularity of the invention, the body of the product pump can slide on the rod of the control piston where it is installed, the piston of the product pump being formed by the end of the rod which

  out of the hydraulic control, said pump being capable of

  smooth up to a stop whose position is adjustable by

  compared to the hydraulic control. This configuration allows

  puts a very simple construction of the product pump, the

  stroke of said pump being defined by the stop. Because of

  the body movement of this pump, the number of

  rights o the watertightness must be ensured is reduced in the middle

  nimum. The invention further provides that the shut-off valve is constituted by an electromagnetic valve contiguous to the casing of the hydraulic control, on which is articulated

  a lever for controlling said valve, the weight of the

  product tank, at the thrust of a float provided in this tank, acting on said lever in opposition to the

  force exerted by a return spring. It is thus possible

  to obtain a complete shutdown of the device before the

  product tank is completely empty.

  According to another object, the invention relates to a product pump for a metering device, characterized in that, in a body, is disposed a piston driven by a movement

  back and forth in a room, carried by a rod of pistons

  your destiny to be connected to an order, and who shares

  the chamber in anterior and posterior

  the anterior blind is connected to an intake pipe

  equipped with a suction valve and, through an evacuation

  a product line with an evacuation valve.

  while the rear cylinder is connected to the front cylinder by a transfer channel opening into the product line downstream of the evacuation valve.

  This has the advantage that the dosage of

  product is not only accomplished during the going of the piston stroke, but also during its return. The dosage is therefore performed on both sides of the piston. We obtain

  a much more regular dosage, the contribution of product does not

  not interrupted during the return of the piston.

  According to a feature of the invention, the effective volume of the anterior displacement is twice the effective volume of the rear displacement. We thus arrive at

  a quasi-continuous supply of the product to the measuring device.

  Preferably, the section of the transfer channel is

  at least 50% and preferably 66% of the section of the original

Evacuation fice. -

  According to another feature of the invention, the

  the pump body is placed on the piston rod

  tone so that it can slide to a stop whose

  position is adjustable to allow volume adjustment

of displacement.

  This configuration allows a very simple construction of the product pump, the stroke of said pump being defined by the stop. Due to the body movement of this pump, the number of places where the seal must

  to be insured is reduced to a minimum.

  Other features and advantages of the invention

  will come out of the description below.

  In the accompanying drawings, given as non-limiting examples:

  fig. 1 is a diagram of the device according to

  vention; fig. 2 is a perspective view of an embodiment of the invention; - fig. 3 is a perspective view from the rear of the device of Figure 2; fig. 4 is a view similar to FIG. 2, of another embodiment;

  5. FIG. 5 is a sectional view of a mode of

  embodiment of the invention; fig. 6 is a section along lines B-B and C-C of FIG. 5; fig. 7 is a sectional view along the line A-A of Figure 5; fig. 8 is a sectional view of another embodiment of the invention; and FIG. 9 is a sectional view along the lines

B-B and C-C of Figure 8.

  In Figure 1 is shown a metering device,

  which comprises a hydraulic control 1, a pump

  duit 2, and a product reservoir 22.

  The hydraulic control 1 comprises a control piston 4 disposed in a housing and which is reciprocated in a cylinder 5 (Figure 5) by the pressure of the liquid. On either side of the control piston 4, the cylinder 5 communicates by means of. channels 6 with an inverting valve 7, which is connected by channels 8 (FIG. 7) with the intake and discharge orifices 9

10 of the housing.

  The cylinder 5 is closed towards the outside by a

  cover 11 which is crossed only by the rod 12 of the piston

  control tone 4. A switching arm 13 is attached to

  the control rod 12 to actuate the reversing valve.

  7 via a switching rod 14. This latter rod 14 is connected by a spring 15 with a distributor arm 16 fixed to the reversing valve 7 so that the latter, by the movement of the control piston 4, jumps

  from one to the other of two extreme positions.

  The outer end of the hollow rod 12 of the control piston 4 is closed and it carries the body 17 of the product pump 2. It is formed in the body 17 a cylindrical space 18 closed on one side, which cap with a certain play piston rod 12, which acts as piston of the pump product 2. At its open end, the

  of the cylindrical space 18 is ensured by a

  19. The body 17 carries laterally valves 20 -

  (Figure 6) connected by channels to the cylindrical space

that 18.

  On the intake side, the product pump 2 is connected by a pipe 21 with the bottom of a reservoir of

  22. The latter rests on one end of a

  23 (Figure 3) articulated on the housing of the hydraulic control, while a spring 25 is hooked to the other end 24 of the lever. From this last end

  a control rod 26 connected to an electromagnetic valve

  27, the latter being arranged on the

  supply of the hydraulic control 1.

  The body 17 of the product pump 2 has a

  thread 28, on which is screwed an adjusting nut 29.

  Between the body 17 of the product pump and the control nut

  glage is mounted a stop 30 which surrounds with game the file-

  28 and which is fixed by rods 31 to the housing of the hydraulic control 1. The stop 30 carries a scale of

  dosage that reads the concentration that has been set.

  The metering device operates as follows:

  With a stop valve in a liquid line, for example in a water distribution network, the device is ready for operation. But it only works when a sufficient quantity of the substance to be mixed (disinfectant product, - detergent, flocculant, veterinary products

  to be added to animal feed).

  found in the product reservoir 22 .. In this case, the

  lever 23 opens the solenoid valve

  that and the water enters through the inversion valve 7 in the

  hydraulic control 1. Under water pressure, the pis-

  control tone 4 moves, and the switching arm 13 which is mounted on the piston rod 12 also moves

in the same direction.

  By the switching rod 14, the switching arm

  13 is connected to the inverting valve 7 via

  of the switching spring 15 and the distribu-

  16. If now, by the movement of the piston

  In the parts described above, the spring 15 exceeds the central axis of the reversing valve 7, this spring 15 pulls the distributor arm 16 to about 600 on the other

  side, the reversing valve 7 thus releases for evacuation.

  the piston side previously connected to the water supply, and simultaneously releases the opposite side of the piston

  for the supply of water from the distribution network.

  The rod 12 of the piston, which is at the same time the piston of the fluid pump 2, moves in the longitudinal axis with the control piston 4. Thus, according to the direction of movement of the piston, the product is alternately repressed and Drawn up in the cycle pump 2. Along the piston rod, the sucked product is either pressed against the valves 20 or sucked from these valves into the pump chamber. The piston of the product pump 2 has enough clearance in the pump body 17 so that the product can

  flow through this gap to the valves 20 or in

  come. The dosage is adjusted by adjusting the stroke length of the fluid pump 2 by a setting nut. The pump

  product 2 accompanies the control piston in its movement

  in the extent of the clearance left by the adjusting nut.

  Automatic shutdown of the device, when the weight

  the reservoir becomes insufficient, is obtained through

  of the electromagnetic valve which is actuated

  caniquement. Switching on or off is pro-

  evoked by the weight of the product tank.

  - Figures 8 and -9 represent a variant of a r -

product pump according to the invention.

  At the outer end of the hollow rod 12 of the piston

  4 is connected to a piston rod 40 which carries the body 17 of the product pump 2. In this body 17 is formed a cylindrical chamber 18 closed on one side,

  in which is disposed a piston 41 of the pump has pro-

  duit 2, carried by the piston rod 40. The sealing of the

  room 18 is secured at its open end by a

  19. The body 17 laterally carries valves which are connected by channels to the cylindrical chamber 18. On the intake side, the product pump 2 is connected to a

  conduit 36 via a suction valve 38.

  On the body 17 of the product pump 2 is realized

  a thread 28 on which is screwed an adjustment nut 29.

  Between the body 17 of the product pump and the control nut

  glage is mounted a stop 30 which surrounds with game the file-

  28 and which is fixed by rods 31 to the housing of the

  hydraulic control. Stop 30 carries a scale of

  wise that allows you to read the concentration that has been set.

  The cylindrical chamber 18 is shared by the piston

  41 in an anterior displacement 18 'and a cubic capacity pos-

  The anterior displacement 18 'is adjacent to the front wall of the piston 41, and the rear displacement 18' is adjacent to the piston rod 40. The volume of the

  anterior displacement 18 'is twice that of the

  posterior leg 18 "As the piston 41 advances, half of the product is discharged from the front cylinder 18 'to the rear cylinder 18" via a transfer channel 42, the other half being forced back through the product line 37. When the piston 41 returns, the quantity of product that had been

  sucked, during the advance of the piston, by the cubic capacity pos-

  18 "is also pushed outside through

the transfer channel 42.

  At the same time, the renewed product is sucked into the front cylinder 18 'through the intake or suction valve 38. There is therefore a suction stroke, and the suction quantity is divided into two halves which

  are discharged to the outside from the

posterior and posterior.

  If the piston 4 with the rod 12 of the control hy-

  1, and the piston 41 of the product pump which. is

  attached to the stem, move forwards (the rod of

  your fate of the hydraulic control), the product which is in front of the piston 41 is expelled through the exhaust valve 39 (the suction valve 38 is closed). Through the transfer channel 42, which leads to the cubic capacity

  posterior 18 "on the rear face of the piston, 50% of the

  dumped in front of the piston 41 is greeted by the

  lume growing from the rear 18 "on the face

  rear of the piston. After reversing the hydraulic control

  which causes the return movement, there is on the one hand discharge of the product located behind the piston 41 towards the product discharge pipe 37 (the valve

  evacuation 39 adjacent to the castrate aeitieure18 'and fer-

  MEE). On the other hand, fresh product is sucked into the anterior cylinder 18 'through the suction valve

  38. After a further inversion of the hydraulic control

  that the process described above recommences.

  Dosage adjustment is done by adjusting the length

  from the stroke to the product pump 2 by a setting nut.

  Product pump 2 moves with the control piston

  as far as the clearance left by the adjusting nut is concerned.

  Of course, the invention is not limited to the examples shown, and many arrangements can

  be brought to these examples without departing from the framework of

  vention. In the exemplary embodiment shown in the drawings (FIGS. 8 and 9), the piston rod 40 of the product pump 2 according to the invention is removably connected.

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  by a pin 43 to the rod 12 of the piston of the hydraulic control 1. The two piston rods can also be

  screwed together or formed in one piece.

  In addition, it is also possible to provide another system for controlling the product pump than coupling directly to a hydraulic control. We can, for example,

  to drive the product pump according to the invention by means of a

  proportion of the flow of the liquid

  the dose of the product must be added.

Claims (7)

R E V E N D I C A T IO N S   1. A hydraulically controlled metering device   comprising a piston (4) animated by a movement of-and-   comes by the pressure of the liquid, the rod (12) of the piston (4) actuating a fluid pump (2) for mixing it with the liquid in an adjustable proportion, the effective stroke of said pump (2) being adjustable, and the liquid coming out of the hydraulic control (1) mixing with the product   out of said pump (2), characterized in that   hydraulic valve (1) is preceded by a stop valve (27) mechanically actuatable for the supply of liquid, said   valve can take two positions depending on the quantity   product contained in a product tank (22),   and in that the product pump (2) is installed in the   the hydraulic control (1) on the rod (12) of the control piston (4) and connected to the fluid reservoir (22).   2. Measuring device according to claim 1,   characterized in that the body of the fluid pump (2) is slidable on the rod (12) of the control piston (4) where it is installed, the piston of the fluid pump (2) being   formed by the end of the stem (12) coming out of the   hydraulic pump (1), said pump (2) being slidable to a stop (30) whose position is adjustable by compared to the hydraulic control.   3. Measuring device according to one of the claims   1 or 2, characterized in that the shut-off valve (27) is   constituted by an electromagnetic valve contiguous to the car-.   the hydraulic control (1), on which is articulated-   a lever (23) for controlling said valve, the weight of the product reservoir (22), or the thrust of a float   provided in this reservoir, acting on said lever oppo-   to the force exerted by a return spring (25).   4. Product pump for a metering device, no.   especially for a hydraulically controlled metering device   according to one of claims 1 to 3, characterized in that -   in a body (17), is mounted a piston (41) reciprocating in a chamber (18), carried by a piston rod (40) to be connected to means of control, and which shares the chamber (18) Y-in cy-   anterior and posterior (18 ', 18 "), the cylinder   anterior dome being connected to an intake pipe   (36) having a suction valve (38) and, by a first   discharge duct, to a product line (37) provided with an evacuation valve (39), while the rear displacement (18 ") is connected to the front cylinder (18 ') via a transfer channel ( 42) opening into the product line (37) downstream of the discharge valve (39). 5. Pump according to claim 4, characterized in that the effective volume of the anterior displacement (18 ')   is twice the effective volume of the engine displacement (18 ").   6. Pump according to one of claims 4 or 5,   characterized in that the section of the transfer channel (42) is at least 50% and preferably 66% of the section the drain hole.   7. Pump according to one of claims 4 to 6,   characterized in that the body (17) is slidably disposed on the piston rod (40) to a stop (30) whose position is adjustable to allow   the adjustment of the cubic capacity.