Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
  • F04B7/0073—Piston machines or pumps characterised by having positively-driven valving the member being of the lost-motion type, e.g. friction-actuated members, or having means for pushing it against or pulling it from its seat
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/10—Valves; Arrangement of valves
  • F04B53/108—Valves characterised by the material
  • F04B53/1082—Valves characterised by the material magnetic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical

Definitions

• the present invention relates to a metering pump intended in particular to equip a machine for dosing liquid products.
• Metering pumps comprising a pump body delimiting a cylindrical pumping chamber having an inlet orifice and a discharge orifice situated at opposite ends of this chamber.
• a piston associated with an operating rod is mounted in the pumping chamber to slide in an alternating movement between the inlet port and the discharge port. This piston is traversed by a pumping orifice which is alternately open and closed by means of a non-return valve.
• a metering pump comprising a pump body delimiting a cylindrical pumping chamber having a longitudinal axis and having an inlet orifice and a discharge orifice situated at opposite ends, a piston crossed by a orifice pumping and mounted in the pumping chamber to slide in an alternating movement between the inlet port and the discharge port, a piston operating rod, and a valve mounted movable relative to the piston between an open position and a closed position of the pumping orifice, and a sleeve of non-magnetic material mounted fixed in the pump body parallel to the longitudinal axis of the pumping chamber and having a closed end situated inside the pump body and an open end opening to the outside of the pump body, the operating rod being equipped with a cooperating magnetic element, through the sleeve, with c a magnetic ring surrounding the sleeve and coupled to the piston.
• the operating rod which evolves inside the sleeve, is completely isolated by the latter from the flow inside the pumping chamber.
• the seal is only ensured between the sleeve and the pump body which are fixed relative to each other. There is therefore no risk of leakage or contamination of the product handled.
• the operating rod is equipped with a second magnetic element cooperating, through the sleeve, with a second magnetic ring surrounding the sleeve and integral with the valve.
• the valve and the second magnetic ring are mounted to slide on the sleeve and the second element magnetic is arranged to constantly return the valve to its closed position.
• the field generated between the second magnetic element and the second magnetic ring thus ensures a magnetic return of the valve.
• the magnetic force field decreases on opening and increases on closing, which improves the functioning of the non-return valve.
• valve and the second magnetic ring are mounted to pivot on the sleeve.
• the magnetic ring has at least two rings surrounding the sleeve and connected by a connecting member extending parallel to the sleeve, the magnetic element generating a magnetic field parallel to the axial direction of the sleeve and having two ends opposite which are arranged the rings of the magnetic ring.
• a magnetic loop is thus created: the magnetic field coming from one of the axial ends of the magnetic element is channeled by the connecting member in the direction of the opposite polarity end of the magnetic element.
• FIG. 1 is a sectional view through an axial plane of a magnetically controlled metering pump according to the invention
• FIG. 2 is an enlarged view of Box II of Figure 1;
• FIG. 3 is a partial sectional view through an axial plane, illustrating a first alternative embodiment of the piston and the valve;
• FIG. 4 is a schematic perspective view illustrating a second alternative embodiment of the piston and the valve.
• FIGs 1 and 2 there is shown a metering pump according to the invention.
• This pump comprises a pump body 1 delimiting a cylindrical pumping chamber 2 having a vertical longitudinal axis 3 and having an inlet orifice 4 and a discharge orifice 5, respectively located at the upper and lower ends of the chamber 2.
• a separating piston 6, here in the form of a disc, is mounted in the chamber 2 to slide longitudinally in an alternating movement between the inlet port 4 and the discharge port 5.
• the piston 6 is hollowed out at its center and has thus the shape of a flat ring whose internal edge delimits, with the external face of the sleeve 9, a central pumping orifice 7.
• the displacement of the piston 6 is controlled by a first operating rod 8 of non-magnetic material which is mounted in a sleeve 9 of non-magnetic material secured to the pump body 1 and extending coaxially and internally thereto.
• the sleeve 9 has a closed end 10 located inside the pumping chamber 2 near the delivery orifice 5 and an opposite open end 11 fixed to the pump body 1 and opening to the outside of this body. pump.
• the first operating rod 8 is connected outside the pump body 1 to an actuating device not shown and penetrates inside the sleeve 9 through the open end 11 of the latter.
• the first operating rod 8 is equipped with two first permanent annular magnets 12 generating a magnetic field of direction parallel to the axis 3 and framed by rings of magnetic material 51.
• the two magnets 12 and the associated rings 51 are fitted onto an end portion 8.1 of small diameter of the first operating rod 8 and are separated by a spacer 16 made of non-magnetic material.
• magnets 12 cooperate with a first magnetic ring 13 which is mounted externally on the sleeve 9 to slide axially and which is coupled to the piston 6 by means of longitudinal connecting lugs 52 of small thickness.
• the magnetic ring 13 is made of a material of high magnetic permeability. It comprises here a plurality of bars 14 extending parallel to the axis 3 around the sleeve 9 and connected to four rings 15 surrounding the sleeve 9.
• the four rings 15 are mounted in pairs associated with each of the two magnets 12. As this is better visible in Figure 2, the rings 15 of each pair are spaced from each other and arranged opposite each of the two axial ends of the magnet
• each magnet 12 corresponding and the ring of associated magnetic material 51.
• the axial ends of each magnet 12 being of opposite polarities, a magnetic field loop is created circulating inside the magnet 12, rings 51, rings 15 and connecting bars 14, as symbolized by the bold line M.
• the displacement of the piston 6 inside the pumping chamber 2 is thus controlled by the first operating rod 8. It is understood that the looping magnetic M which is exerted between the magnets 12 and the magnetic ring
• the piston 6 is thus secured to the first operating rod 8 through the sleeve 9 and is therefore driven in the reciprocating movement of the rod 8.
• This arrangement offers the advantage of completely isolating the first rod from maneuver 8 of the flow inside of the pumping chamber 2, so that no seal is to be provided between this rod and the pump body 1.
• a non-return valve 17 is mounted on the sleeve 9 for sliding axially between an open position and a closed position of the pumping orifice 7 of the piston 6.
• This valve 17 is here in the form of a disc of complementary shape to the orifice 7.
• the valve 17 is connected, by means of connecting bars 18 parallel to the axis 3, to a ring 19.
• the valve 17, the bars 18 and the ring 19 are made up of a material of high magnetic permeability and thus form a second magnetic ring 20 similar to the ring 13 used to control the displacement of the piston 6.
• This magnetic ring 20 cooperates, through the sleeve 9, with a second annular magnet 21 fixed on the portion 8.1 of the first operating rod 8.
• the magnet 21 is spaced from the second magnet 12 by a spacer 22 made of magnetic material.
• the magnetic flux of the second magnet 12 is therefore divided in the spacer 22 into a flux part which forms a magnetic loop with the opposite ring 15 associated with the piston 6, and another part which reinforces the magnetic flux of the magnet 21 so as to constantly remind the magnetic ring 20 towards a closing of the pumping orifice 7 by the valve 17.
• a valve 23 is mounted on the sleeve 9 to slide along the axis 3 between an open position and a closing position of the discharge orifice 5.
• the valve 23 is integral with a third magnetic ring 24 similar to the magnetic rings 13 and 20 previously described.
• the ring 24 thus comprises two rings 25 of material of high magnetic permeability spaced from one another and connected by connecting bars 26 parallel to the axis 3.
• the valve 23 is fixed to one end of the bars 26.
• the magnetic ring 24 cooperates, through sleeve 9, with a third annular magnet 27 mounted for slide in the sleeve 9 and coupled to a second operating rod 28 which passes through the first operating rod 8 and can slide freely inside the latter.
• the magnet 27 is mounted between two flanges 29, 30 made of magnetic material integral with the rod 28.
• the valve 23 can therefore be opened or closed at will by acting on the second operating rod 28 independently of the first operating rod 8, the magnet 27, the flanges 29 and 30, and the magnetic ring 24 ensuring axial magnetic coupling of the valve 23 with the second operating rod 28.
• the intake orifice 4 is preferably charged, that is to say that the pumping chamber 2 is supplied with product under pressure, at a pressure which is determined so that the force exerted on the non-return valve 17 is slightly less than the restoring force exerted by the magnet 21 on the ring 20 for a closed position of the non-return valve. Whatever the position of the piston 6, the valve 17 is therefore kept closed.
• the piston 6 being at its bottom dead center, near the discharge orifice 5, the valve 23 is in the closed position and the pumping chamber is filled with product both above and below the piston 6.
• the pressure resulting from the displacement of the piston is added to the pressure resulting from the pressure supply so that the non-return valve 17 is separated from the pumping orifice 7, and this against the return force exerted by the magnet 21 on the magnetic ring 20.
• the return force exerted by the magnet 21 decreases in intensity with the distance from the magnetic ring 20.
• the intensity of the return force is therefore lower in the open position of the valve 17 than in the closed position.
• the valve 17 therefore opens quickly at full opening and the displacement of the piston 6 is thereby facilitated.
• the product to be packaged thus passes through the piston 6 while remaining stationary without the product being discharged through the inlet orifice.
• the second operating rod 28 is actuated to control, by virtue of the magnetic coupling of the magnet 27 with the ring 24, the movement of the valve 23 in the open position of the discharge orifice 5.
• the first operating rod 8 is then actuated to push the piston 6 towards the discharge orifice 5.
• the force exerted by the product on the non-return valve return as a result of the displacement of the piston 6 then adds to the magnetic return force of the magnet 21 and closes the non-return valve 17.
• the piston 6 is moved at a speed substantially equal to the speed of flow of the product through the discharge orifice 5.
• the product is then substantially in pressure above and below the piston 6 which accompanies the product located inside the pumping chamber 2 in its flow towards the ref port only.
• the piston 6 is therefore not subject to the sealing requirements required for an ordinary piston exerting a pumping pressure. It can thus be devoid of sealing segment and be mounted with clearance in the chamber 2 as illustrated in FIG. 1.
• the second operating rod 28 is actuated to place the valve 23 in the closed position of the discharge port 5
• the dosing pump is ready for a new cycle.
• cleaning the pump just see the cleaning product under high pressure through the pump inlet while opening the valve 23.
• the pressure of the cleaning product opens the non-return valve 17 and keeps it open during the entire cleaning period .
• the clearance around the piston 6 also allows a flow of the cleaning product around the piston so that the pump is completely cleaned without it being necessary to disassemble it.
• FIG 3 there is shown a first alternative embodiment of the piston and the valve.
• the piston here designated by the reference 40 is directly fixed to the lower end of the bars 14 of the magnetic ring 13.
• the piston 40 no longer has a central pumping orifice, but is mounted centrally with a low functional clearance on the sleeve 9 and has an outside diameter substantially smaller than the inside diameter of the pump body 1, so that its peripheral edge defines, with the internal face of the pump body 1, a peripheral pumping orifice 41.
• FIG. 4 there is shown a second alternative embodiment of the piston and the valve.
• the piston here designated by the reference 30, has a pumping orifice 31 offset relative to the sleeve 9.
• the closure of the pumping orifice 31 is ensured by a valve 32 which is mounted on the sleeve 9 via a magnetic ring 33 to pivot around this sleeve.
• the magnetic ring 33 is made of a material of high magnetic permeability and comprises, like the ring 20 previously described, two rings 34, 35 connected by connecting bars 36 parallel to the sleeve 9.
• the ring 35 which is the most near the piston 30, is extended by a bracket 37 whose free end forms the valve 32.
• This valve 32 has a base 38 having a useful lower face which slides on a flat upper face 39 of the piston 30 when the magnetic ring 33 pivots around the sleeve 9.
• the base 38 of the valve 32 covers this opening in a lateral shearing movement, so as to expel or cut solid particles which could be at the edge of the pumping orifice 31.
• the movement of the magnetic ring 33 takes place in the same manner as previously by magnetic coupling of the ring 33 with a magnetic element secured to the rod 8.
• the coupling is no longer only axial but also angular, it is that is to say that the pivoting of the magnetic ring 33 is coupled to that of the first operating rod 8.
• the magnetic element associated with the rod 8 is therefore no longer constituted by an annular magnet, but consists for example of a plurality of magnets arranged radially inside the sleeve 9 in correspondence with the connecting bars 36 of the magnetic ring 33.
• the invention is not limited to the embodiments which come from be described, but on the contrary includes any variant incorporating, with equivalent means, the essential characteristics of the invention.
• the return magnet 21 of the non-return valve 17 has been illustrated in an embodiment where it is carried by the same control rod as the magnets 12 controlling the position of the piston 6, it is also possible to carry out the invention by mounting the magnet 21 on a separate control rod whose movements are synchronized with those of the piston to open or close the pumping orifice.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electromagnetic Pumps, Or The Like (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)
• Control Of Positive-Displacement Pumps (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9494048

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (8)

• 1996
  • 1996-07-15 FR FR9608816A patent/FR2751035B1/fr not_active Expired - Fee Related
• 1997
  • 1997-07-07 WO PCT/FR1997/001220 patent/WO1998002658A1/fr not_active Ceased
  • 1997-07-07 JP JP10505657A patent/JPH11514067A/ja active Pending
  • 1997-07-07 US US09/202,502 patent/US6132188A/en not_active Expired - Fee Related
  • 1997-07-07 EP EP97931886A patent/EP0912829A1/de not_active Withdrawn
  • 1997-07-07 BR BR9710281A patent/BR9710281A/pt not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events