EP1820966A2 - Pompe de dosage - Google Patents

Pompe de dosage Download PDF

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Publication number
EP1820966A2
EP1820966A2 EP07102398A EP07102398A EP1820966A2 EP 1820966 A2 EP1820966 A2 EP 1820966A2 EP 07102398 A EP07102398 A EP 07102398A EP 07102398 A EP07102398 A EP 07102398A EP 1820966 A2 EP1820966 A2 EP 1820966A2
Authority
EP
European Patent Office
Prior art keywords
dosage
stem
pump according
chamber
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07102398A
Other languages
German (de)
English (en)
Other versions
EP1820966A3 (fr
EP1820966A8 (fr
EP1820966A9 (fr
Inventor
Giovanni Rampazzo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1820966A2 publication Critical patent/EP1820966A2/fr
Publication of EP1820966A3 publication Critical patent/EP1820966A3/fr
Publication of EP1820966A8 publication Critical patent/EP1820966A8/fr
Publication of EP1820966A9 publication Critical patent/EP1820966A9/fr
Withdrawn legal-status Critical Current

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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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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

Definitions

  • the present invention relates to a dosage pump.
  • the pump is adapted particularly but not exclusively for proportionally dosing small amounts of liquids in order to feed them into a hydraulic circuit or a system for generating hot water.
  • heating systems are subject to the risk of scale and corrosion due to the presence of calcium and magnesium salts.
  • Dosage pumps such as the one disclosed and claimed in Italian patent No. 1336867 in the name of this same Applicant, which comprise, within a hollow body to be interposed between portions of piping of a hydraulic circuit, a vaned impeller which rotates by way of the flowing fluid and, by way of means for mechanical reduction and transmission of the rotary motion and means for converting the rotary motion into reciprocating rectilinear motion, moves mechanically associated means for drawing and pumping the liquid to be dosed.
  • These means for drawing and pumping the liquid to be dosed are arranged inside a containment vessel for said liquid, which is fixed to the hollow body, and comprise an injection stem which is moved by the motion conversion means so that its lower end enters and exits a dosage chamber.
  • the means for converting the rotary motion into a reciprocating rectilinear motion are constituted generally by a cam wheel, whose equidistant and identical protrusions which protrude from its perimeter act on a pusher which is perpendicular to the rotation shaft of the cam wheel and is formed by the upper end of the injection stem.
  • the injection stem is adapted to slide within a tubular element arranged within the liquid container, and its upper pusher end is pushed against the cam wheel by a spring arranged between an abutment inside the tubular element and a shoulder into which such pusher widens.
  • the injection stem moved by the motion conversion means, enters and exits with its lower end, which lies opposite the pusher, a dosage chamber, which on the opposite side with respect to the entry side for said injection stem is closed by a flow control element which is pushed closed by elastic means.
  • the entry and exit movement of the injection stem with respect to the dosage chamber produces the dosed injection of the liquid into the container toward a channel for connection to a pipe for the rise of the dosed liquid, which is connected to the dosage chamber on the side of the flow control element.
  • the cam wheel by acting only by pressing downward on the pusher and on the stem of which the pusher is a part, in fact entails the use of a return spring for the rise of the injection stem.
  • the continuous thrust applied by the spring to the pusher produces a snap action thereof when it exits a protrusion of the cam wheel, and said snap action, repeated continuously at each passage of the pusher over each protrusion of the cam wheel, in turn generates a ticking sound which can be unpleasant for a user who for any reason is in the vicinity of the pump.
  • the aim of the present invention is to provide a dosage pump which is capable of obviating the drawbacks shown by known types of pump.
  • an object of the present invention is to provide a dosage pump whose means for converting rotary motion into reciprocating rectilinear motion are more reliable and stronger than in known types of pump.
  • Another object of the present invention is to provide a pump which is quiet.
  • Another object of the present invention is to provide a pump which is constructively simple and can be assembled quickly.
  • Another object of the present invention is to provide a dosage pump which can be manufactured cheaply with known systems and technologies.
  • a dosage pump of the type which comprises a hollow body which is adapted to be interposed between portions of piping of a hydraulic circuit and is provided internally with a vaned rotary element, which rotates due to the flowing fluid and is associated with means for mechanical reduction and transmission of rotary motion and with means for converting rotary motion into reciprocating rectilinear motion, which in turn are connected to means for drawing and pumping the liquid to be dosed, which are provided, inside a container for said liquid, which is fixed to said hollow body, by an injection stem, which is moved by said motion conversion means so that it enters and exits, with its end, a dosage chamber which, on the opposite side with respect to the entry side for said injection stem, is closed by a flow control element which is pushed closed by elastic means, said chamber being connected to the inside of said container on the side of said injection stem and to a channel for connection to a pipe for the rise of the dosed liquid toward said hollow body on the side of said
  • a dosage pump according to the invention is generally designated by the reference numeral 10.
  • the pump 10 comprises a hollow body 11, which is adapted to be interposed between portions of piping of a hydraulic circuit.
  • the hollow body is provided internally with a vaned rotary element 12, which rotates due to the flowing fluid and is associated with means 13 for mechanical reduction and transmission of rotary motion and with means 14 for converting rotary motion into reciprocating rectilinear motion.
  • the drawing and pumping means 15 are provided, inside a container 16 for the liquid, by an injection stem 17, which is moved by the motion conversion means 14 so that it enters and exits, with its end 18, a dosage chamber 19.
  • the dosage chamber 19 is closed, on the opposite side with respect to the entry side for the injection stem 17, by a flow control element 20, which is pushed closed by elastic means 21.
  • the chamber 19 is connected to the inside of the container 16 on the side of the injection stem 17 and to a channel 22 for connection to a pipe 23 for the rise of the dosed liquid toward the hollow body 11 on the side of the flow control element 20.
  • the chamber 19 and the connecting channel 22 are formed on a single body 24, inside which the flow control element 20 with its elastic closure means 21 is also fitted.
  • the injection stem 17 is adapted to perform a translational motion within a tubular guiding element 25, which is rigidly coupled by a first upper end 26, by way of snap-acting quick-coupling means, to a lid 27 of the container 16; the lid 27 in turn is fixed to the hollow body 11.
  • the means 14 for converting rotary motion into reciprocating rectilinear motion are constituted by a cam 28, which is keyed onto a shaft 29 which is turned by the means 13 for transmission and speed reduction.
  • the cam 28 is inserted in a slot 30 which is formed on a head 31 of the injection stem 17.
  • the slot 30 has such a width as to allow the complete rotation of the cam 28 inside it so that the head 31 of the stem 17 is not pushed and moved transversely to the axis of the stem 17; further, the height of the slot 30 is such that the cam 28 can push the stem 17 both upward and downward.
  • the cam 28 is constituted by an eccentric disk whose diameter is substantially equal to the height of the slot 43.
  • the cam 28, like the stem 17 with the head 31 provided with the slot 30, can be obtained cheaply by molding plastic material.
  • the shaft 29 on which the cam 28 is keyed also supports a first gear 32, which is coupled to a second gear 33 which is keyed to a second shaft 34, which exits from a gear train 35 which belongs to the speed reduction and transmission means 13.
  • the gear train 35 together with the reduction ratio determined by the meshing of the second gear 33 with the first gear 32, sets a timing of the dosage which is proportional to the amount of water that flows through the vaned element 12.
  • the pump 10 allows precise and repeatable dosage between 3.2 and 3.7 ppm per liter.
  • the rotation of the cam 28 therefore acts by pushing alternately against the upper and lower edges of the slot 30.
  • the cam 28 pushes downward the injection stem 17 within the dosage chamber 19 during injection, and then, as its rotation continues, pushes it upward to release the chamber 19 and allow the inflow therein of a new dose of liquid.
  • the double action on the stem 17 prevents said stem from remaining stuck for any reason within the chamber 19, always ensuring full functionality to the pump 10.
  • the second lower end 36 of the tubular element 25 is arranged so as to press, within the single body 24, against a first annular sealing gasket 37 at the inlet of the dosage chamber 19.
  • the flow control element 20 is constituted by a ball and elastic means 21 that push it are constituted by a helical spring which rests against the bottom of a channel 38 for connection between the dosage chamber 19 and the channel 22 for connection to the riser pipe 23.
  • the ball is pushed against a second annular sealing gasket 39 arranged at the outlet of the dosage chamber 19.
  • a spacer ring 41 is further provided within the dosage chamber 19 and is interposed between the first annular sealing gasket 37, arranged at the inlet of the chamber 19, and the second annular sealing gasket 39, which is arranged in abutment against an underlying shoulder 40 at the outlet of the chamber 19; the hole of said spacer ring allows the passage without play of the end 18 of the injection stem 17.
  • the second lower end 36 of the tubular guiding element 25 is formed by protrusions 42 which act as a guide for the end 18 of the stem 17.
  • the protrusions 42 press against the first gasket 37.
  • the guiding protrusions 42 are arranged symmetrically so as to form between them slots 43 for the passage of the liquid to be dosed toward the dosage chamber 19.
  • the liquid passes within the single body 24 through two openings 44 provided in the single body 24 indeed at the slots 43.
  • the means for snap-action quick coupling of the tubular guiding element 25 to the lid 27 of the container 16 are constituted by at least two elastically deformable mutually opposite tabs 57, each of which has at its end a tooth 58 which is adapted to snap into engagement on an abutment edge 59 formed by the passage hole provided in the lid 27, for the first end 26 of the tubular guiding element 25.
  • Such quick-coupling means increase considerably the speed with which the pump 10 according to the invention is assembled, since it is sufficient to push the first end 26 of the tubular element 25 into the corresponding hole of the lid 27 to achieve the coupling of the two components.
  • the single body 24 is adapted to be assembled to the tubular guiding element 25 with a quick coupling of the bayonet type, which further increases the speed of the operations for assembling the pump 10 according to the invention.
  • Said bayonet coupling is constituted by two mutually opposite and symmetrical wings 45, which protrude radially from the second lower end 36 of the tubular element 25.
  • the wings 45 enter the single body 24 by means of two complementarily shaped openings 46, which extend in terms of depth along the direction of the axis of the single body 24 until they affect the openings 44 for the inflow of the liquid over a height which is at least equal to the thickness of the wings 45.
  • a generic opening 46 is therefore connected to the nearby and underlying opening 44; in this manner, the operator who assembles the two components merely inserts the wings 45 of the tubular element 25 in the corresponding openings 46, pushes them to the bottom of the openings 46 and then turns the single body 24 so that the wings 45 slide at the openings 44 in a configuration which prevents extraction and in which they abut against the upper edge 44a of said openings.
  • the present invention provides a dosage pump whose means for converting rotary motion into reciprocating rectilinear motion are more reliable and stronger than in known types of pump.
  • the present invention provides a pump which is quiet with respect to known types.
  • the present invention provides a pump which is constructively simple and quick to assemble.
  • the present invention provides a dosage pump which can be manufactured cheaply with known systems and technologies.
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Reciprocating Pumps (AREA)
EP07102398A 2006-02-16 2007-02-14 Pompe de dosage Withdrawn EP1820966A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPD20060026 ITPD20060026U1 (it) 2006-02-16 2006-02-16 Struttura perfezionata di pompa dosatrice

Publications (4)

Publication Number Publication Date
EP1820966A2 true EP1820966A2 (fr) 2007-08-22
EP1820966A3 EP1820966A3 (fr) 2009-04-15
EP1820966A8 EP1820966A8 (fr) 2009-11-04
EP1820966A9 EP1820966A9 (fr) 2009-11-11

Family

ID=40243463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07102398A Withdrawn EP1820966A3 (fr) 2006-02-16 2007-02-14 Pompe de dosage

Country Status (2)

Country Link
EP (1) EP1820966A3 (fr)
IT (1) ITPD20060026U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20120118A1 (it) * 2012-09-24 2014-03-25 Gel S P A Dispositivo per l'immissione dosata di additivi liquidi all'interno di circuiti idraulici.
EP3176432A1 (fr) * 2015-12-03 2017-06-07 GEL S.r.l. Dispositif de pompage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1522281A (en) * 1923-04-19 1925-01-06 William N Weinman Pump
FR2247111A6 (en) * 1973-10-05 1975-05-02 Gurtner Sa Membrane pump for liquefied gas - pumping and safety membranes have concentric annular corrugations
GB1395206A (en) 1971-11-30 1975-05-21 Lang Apparatebau Gmbh 'easuring out or dosing device
FR2429463A1 (fr) 1978-06-23 1980-01-18 Pollard Jean Augustin Dispositif doseur pour introduire dans une conduite parcourue par un flux liquide une proportion constante d'un liquide additionnel
US4321938A (en) 1979-07-07 1982-03-30 Cillichemie Ernst Vogelman Gmbh & Co. Dosing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549048A (en) * 1968-07-25 1970-12-22 Charles R Goodman Chemical proportionating apparatus
DE2948582A1 (de) * 1979-12-03 1981-06-04 Lang Apparatebau Gmbh, 8221 Siegsdorf Dosiereinrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1522281A (en) * 1923-04-19 1925-01-06 William N Weinman Pump
GB1395206A (en) 1971-11-30 1975-05-21 Lang Apparatebau Gmbh 'easuring out or dosing device
FR2247111A6 (en) * 1973-10-05 1975-05-02 Gurtner Sa Membrane pump for liquefied gas - pumping and safety membranes have concentric annular corrugations
FR2429463A1 (fr) 1978-06-23 1980-01-18 Pollard Jean Augustin Dispositif doseur pour introduire dans une conduite parcourue par un flux liquide une proportion constante d'un liquide additionnel
US4321938A (en) 1979-07-07 1982-03-30 Cillichemie Ernst Vogelman Gmbh & Co. Dosing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20120118A1 (it) * 2012-09-24 2014-03-25 Gel S P A Dispositivo per l'immissione dosata di additivi liquidi all'interno di circuiti idraulici.
EP3176432A1 (fr) * 2015-12-03 2017-06-07 GEL S.r.l. Dispositif de pompage

Also Published As

Publication number Publication date
EP1820966A3 (fr) 2009-04-15
ITPD20060026U1 (it) 2007-08-17
EP1820966A8 (fr) 2009-11-04
EP1820966A9 (fr) 2009-11-11

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