Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
  • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
  • B05B11/02—Membranes or pistons acting on the contents inside the container, e.g. follower pistons
  • B05B11/028—Pistons separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container
  • B05B11/029—Pistons separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container located on top of the remaining content
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
  • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
  • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
  • B05B11/1028—Pumps having a pumping chamber with a deformable wall

Definitions

• the present invention relates to a pump and more particularly to a diaphragm pump.
• Conventional pumps generally include a body intended to communicate in the lower part with a dip tube via an inlet valve and to be connected in the upper part to the edge of a tank and containing a metering chamber sealed in the upper part by compression means provided with an exhaust valve and a return member capable of being actuated by manual support on a dispensing head provided with a discharge duct.
• said return member comprises an elastically deformable internal membrane carried by the dispensing head and cooperating with a rigid cup fixed under said head and delimiting with said membrane the dosing chamber.
• said membrane comprises at least one supply orifice as well as a central solid disc capable of coming to be sealed against the upper orifice of the dip tube by forming an intake valve.
• the central solid disc is connected to said membrane by three radial bridges delimiting between them as many supply orifices.
• said membrane has, in the free state, a U-shaped section and comprises a base c) * 'lind ⁇ que mounted coaxially and tightly around the upper part of the dip tube which projects into the metering chamber.
• said rigid cup comprises a central ejection channel opening into the discharge pipe of the dispensing head via said exhaust valve.
• the lower edge of said rigid cup is formed by a peripheral collar intended to come into deforming support against said membrane.
• said cup is housed at least partially inside said membrane.
• the free edge of said membrane is trapped by said cup inside the dispensing head.
• the external wall of said membrane comprises a peripheral rib ensuring both the setting of the lower edge of the dispensing head and a free couching with respect to the internal wall of the body.
• said exhaust valve consists of a flexible tongue carried transversely by the lower end of the discharge duct of the dispensing head.
• the pump of the invention has a very simple structure without any metallic element.
• FIGS. 1A and 1B represent views in vertical section respectively and along BB of an embodiment of the pump of the invention mounted on a tank and in the rest position;
• - Figure 2 shows a partial sectional view of the pump of Figures 1A and 1B in the initial phase of distribution; - Figure 3 shows a partial sectional view of the pump of Figure 2 in the final distribution phase; - Figure 4 shows a partial sectional view of the pump of Figure 2 in its phase of return to the rest position.
• the pump P of the invention shown in FIGS. 1A and 1B is intended for the distribution of liquid or pasty products contained in a reservoir R.
• This pump is here of the "airless” type, that is to say without air intake and is therefore associated with a movable bottom F ensuring, both the confinement of the product inside the tank R and the scraping of its inner wall.
• the bottom F is here capable of moving downward during the successive phases of dispensing from a high position for filling the reservoir R shown in FIG. 1A.
• the pump P comprises a body 1 intended to communicate, in the lower part via an inlet valve with a tube 2 immersed in the product, and to be connected, in the upper part, to the upper edge of the reservoir R.
• the body 1 is provided spacers E ensuring the blocking up of the movable bottom F when filling the reservoir R.
• the body 1 contains a metering chamber 10 closed in a sealed manner, in the upper part, by compression means provided with an exhaust valve and a return member.
• compression means forming a piston make it possible to exert pressure on the product filling the chamber 10 by being actuated by manual support on a dispensing head T which covers the pump P by forming a push button and which is provided with a conduit evacuation C.
• the return member comprises an internal membrane 3 made of an elastically deformable material such as an elastomer (silicone, rubber.) Carried by the head T and cooperating with a rigid cup 4 fixed under the head T and delimiting, with the membrane 3 the metering chamber 10.
• an elastomer silicone, rubber.
• the membrane 3 comprises at least one supply orifice 30 as well as a central solid disc 31 capable of coming to be sealed against the upper orifice 20 of the tube 2, thereby forming the intake valve.
• the disc 31 is connected to the membrane 3 by three radial bridges 32 delimiting between them as many supply orifices 30.
• the membrane 3 is made in one piece with the bridges 32 and the disc 31.
• the membrane 3 In the free state, the membrane 3 has a substantially U-shaped cross section defining an inverted bell shape and comprises a cylindrical base 33 mounted coxially and sealingly around the upper part of the dip tube 2 which projects inside. body 1.
• the upper part of the tube 2 is provided with a cylindrical shoulder 21 ensuring the connection with the bottom 11 of the body 1 and on which the base 33 is fitted with tight radial tightening.
• the rigid cup 4 comprises a central cylindrical channel 40 for ejection opening into the evacuation duct C of the head T via the exhaust valve.
• the channel 40 communicates in the lower part with the metering chamber 10 and is preferably fitted onto the conduit C of the head T.
• the cup 4 is housed, at least partially at the interior of the membrane 3 of U-shaped section.
• the lower edge of the cup 4 is formed by a peripheral collar 41 intended to come into deforming abutment against the internal wall of the membrane 3 as shown in FIGS. 2 and 3 during the product distribution phase.
• the free edge of the membrane is trapped by the cup 4 inside the head T.
• the free edge of the cup 4 is provided with a rim.
• transverse 42 snaps into a housing of corresponding profile formed on the internal wall of the head T, thereby wedging the membrane in an intermediate manner.
• the assembly consisting of the head T, the membrane 3 and the cup 4 is retained in the body 1 only by the radial clamping action of the base 33 of the membrane 3 on the connecting shoulder 21 of tube 2.
• the assembly will therefore be reinforced by welding or bonding of the base 33 to the shoulder 21 and / or to the bottom 11 of the body 1.
• the outer wall of the membrane 3 has a peripheral rib 34 ensuring both the setting of the lower edge of the head T and a free couhssement relative to the inner wall of the body 1 allowing free exhaust.
• the bottom 11 of the body 1 is equipped with axial fins 12 forming end-of-travel stops for the rib 34 of the membrane 3. The height of the fins 12 thus determines the maximum degree of deformation of the membrane 3 and therefore the volume of product. distributed by dose.
• the exhaust valve preferably consists of a flexible tongue f carried transversely by the end of the evacuation duct C of the head T.
• the end of the downward travel of the head T and of the cup 4 corresponds to the abutment contact of the rib 34 of the membrane 3 on the fins 12 of the body 1.
• the tongue f is folded back on its seat while closing the channel 40.
• the stopping of the manual support leads to the automatic raising of the head T and of the cup 4 because the membrane 3 has been elastically deformed and tends to return in the manner of a spring towards a free bell state (corresponding to its initial shape shown in FIG. 1A).
• the upward movement of the head T and the return of the membrane 3 to the rest position are accompanied by an increase in the volume of the chamber 10 creating a vacuum inside said chamber.
• This depression causes the inlet valve to open by axial displacement of the disc 31 of the membrane 3, towards the interior of the chamber 10.
• This movement of the disc 31 which is made possible by the flexibility of the bridges 32 allows the product to be sucked in via the supply orifices 30 until the chamber 10 (including the channel 40) is completely filled and the pressures balanced.
• Each distribution phase is accompanied by a displacement of the movable bottom F inside the tank R.

Landscapes

• Reciprocating Pumps (AREA)
• Closures For Containers (AREA)
• External Artificial Organs (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8850763

Family Applications (1)

Country Status (14)

Families Citing this family (29)

Family Cites Families (10)

• 2000
  • 2000-05-30 FR FR0006894A patent/FR2809776B1/fr not_active Expired - Fee Related
• 2001
  • 2001-05-29 US US10/296,211 patent/US6712243B2/en not_active Expired - Fee Related
  • 2001-05-29 AT AT01940618T patent/ATE344107T1/de not_active IP Right Cessation
  • 2001-05-29 CA CA002410792A patent/CA2410792A1/en not_active Abandoned
  • 2001-05-29 DE DE60124244T patent/DE60124244T2/de not_active Expired - Lifetime
  • 2001-05-29 ES ES01940618T patent/ES2275688T3/es not_active Expired - Lifetime
  • 2001-05-29 BR BR0111481-6A patent/BR0111481A/pt active Search and Examination
  • 2001-05-29 WO PCT/FR2001/001654 patent/WO2001091913A1/fr active IP Right Grant
  • 2001-05-29 CN CNB018103472A patent/CN1162223C/zh not_active Expired - Fee Related
  • 2001-05-29 MX MXPA02011738A patent/MXPA02011738A/es active IP Right Grant
  • 2001-05-29 JP JP2001587918A patent/JP2003535250A/ja active Pending
  • 2001-05-29 EP EP01940618A patent/EP1284827B1/de not_active Expired - Lifetime
  • 2001-05-29 AU AU2001274139A patent/AU2001274139A1/en not_active Abandoned
• 2004
  • 2004-01-21 HK HK04100472A patent/HK1057717A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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