EP2871362A1 - Pompe à diaphragme volumétrique alternative pour liquides - Google Patents

Pompe à diaphragme volumétrique alternative pour liquides Download PDF

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Publication number
EP2871362A1
EP2871362A1 EP20140187054 EP14187054A EP2871362A1 EP 2871362 A1 EP2871362 A1 EP 2871362A1 EP 20140187054 EP20140187054 EP 20140187054 EP 14187054 A EP14187054 A EP 14187054A EP 2871362 A1 EP2871362 A1 EP 2871362A1
Authority
EP
European Patent Office
Prior art keywords
piston
thrust
cylinder
chamber
pump
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.)
Granted
Application number
EP20140187054
Other languages
German (de)
English (en)
Other versions
EP2871362B1 (fr
Inventor
Antonio Bertazzoni
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.)
Imovilli Pompe Srl
Original Assignee
Imovilli Pompe Srl
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 Imovilli Pompe Srl filed Critical Imovilli Pompe Srl
Publication of EP2871362A1 publication Critical patent/EP2871362A1/fr
Application granted granted Critical
Publication of EP2871362B1 publication Critical patent/EP2871362B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • 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
    • F04B53/18—Lubricating

Definitions

  • the present invention relates to a reciprocating positive-displacement diaphragm pump for liquids, operating with flow rates from 5 to 500 litres/min and with pressures of from 0 to 100 Bar.
  • the typical sector of application is agriculture, with particular reference to the treatment and protection of crops; however it can be applied in other fields besides.
  • Figure 1 is an axial section of an example of a reciprocating positive-displacement diaphragm pump for liquids, made by the same Applicant, of a type that has been known for years.
  • the pump illustrated in figure 1 has two piston-cylinder groups axially opposite one another, each of which comprises:
  • the pump further comprises a thrust chamber 17, separated from the pump chamber 10, delimited between the diaphragm 15, the thrust surface 12a of the piston and the guide surface 11 b of the cylinder; the chamber 17 is sealedly closed and is filled with non-compressible thrust oil.
  • the piston 12 comprises an elastic wiper ring 13, which realizes the seal by acting against the guide surface 11 b of the cylinder 11.
  • the pump comprises a substantially cylindrical wall 21 which defines a rear tank 20 filled with thrust oil, which closes both the cylinder 11 and the piston 12, and is separated from and non-communicating with the thrust chamber 17.
  • a mechanism is comprised for actuating a reciprocating axial motion of the piston 12 in the cylinder 11, between a bottom dead centre (PMI) and a top dead centre (PMS) and vice versa; for example a drive shaft with a cam 23 is included, which acts on each piston 12 by means of a respective connecting rod 24.
  • PMI bottom dead centre
  • PMS top dead centre
  • the thrust needed for the pumping of the pressurised liquid (water) is exerted by the diaphragm (15) which is made of elastic material (typically rubber) and is subject to a reciprocating movement (typically induced by the crank mechanism driven by the shaft 22), which, together with a cylinder head 26 (cap-shaped) circumscribes a volume variable between a maximum value and a minimum value (capacity) into which the fluid enters and exits in a reciprocating motion, the flow being regulated by valves 27a and 27b of the unidirectional type, respectively aspirating and delivery, with automatic opening.
  • the diaphragm which is made of elastic material (typically rubber) and is subject to a reciprocating movement (typically induced by the crank mechanism driven by the shaft 22), which, together with a cylinder head 26 (cap-shaped) circumscribes a volume variable between a maximum value and a minimum value (capacity) into which the fluid enters and exits in a reciprocating motion, the flow being regulated by valves 27a
  • the pressure energy is transferred to the liquid (water) to be pumped directly from the diaphragm 15 which is pushed, during this phase, by the piston 12, in part by direct action, and in part by the mass of thrust oil enclosed in the thrust chamber 17.
  • This cycle is repeated in the same way at each turn of the drive shaft 22.
  • An aim of the present invention is to reduce the manufacturing costs of the pumps having the characteristics described above.
  • the wall which delimits the rear of the pump tank 12, in addition to fulfilling the function of oil containment also has the function of guiding the piston, thus rendering the guide cylinder unnecessary.
  • the invention relates to pumps with any number of piston-cylinder groups; only by way of example, the pump shown in figures 2-4 (and also the one shown in figure 1 ) comprises two piston-cylinder groups, arranged on the same axis; however the following description of the figures is focused on one only of these groups, the one placed on the left side in the figures, since the one on the right side exhibits the same characteristics.
  • Identical components of the piston-cylinder groups on the left side and right side are denoted using the same reference numeral.
  • the pump illustrated in figures 2-4 comprises, as mentioned above, two piston-cylinder groups.
  • the piston-cylinder group further comprises a thrust chamber 37, separate from the pump chamber 30, delimited between the diaphragm 35, the thrust surface 32a of the piston and the guide surface 31 b of the cylinder; the chamber 37 is sealedly closed and is filled with non-compressible thrust oil.
  • the piston 32 comprises a front edge seal 33a, defined by the front edge of an elastic wiper ring 33, borne by the piston 32, which realizes the oil seal between the piston and the cylinder by acting against the guide surface 31 b of the cylinder 31, the edge 33a of which defines the boundary of the thrust chamber 37 between the cylinder 31 and the piston 32.
  • the pump comprises an oil-filled rear reservoir 40 enclosing both the cylinder 31 and the piston 12, and is separate and not communicating with the thrust chamber 37.
  • the oil contained in the tank 40 serves both to lubricate the moving parts of the piston, also contained within the reservoir 40, and to provide return oil for the thrust chamber 37.
  • the rear tank 40 is delimited on the transversal section by at least one piston and on the lateral part by a tubular lateral wall 41 (wherein the term "tubular" means that every transversal section of the wall defines a circular closed loop), a front portion of which defines the guide cylinder 31; in particular, this front portion comprises an internal surface which defines the cylindrical guide surface 31 b of the piston 32 and a rear portion 41 a joined, preferably in a single body, to the front portion.
  • the tank 40 is delimited on both opposite front sides by the two pistons 32 and laterally by the tubular wall 41.
  • the pump comprises a mechanism, housed in the rear reservoir 40, for actuating a reciprocating axial movement of the piston 32 in the cylinder 31 thereof, between a bottom dead center (PMI) and a top dead center (TDC, and vice versa; in particular a drive shaft 42 with a cam 43 is provided, which acts on both the pistons 32 by means of respective connecting rods 44.
  • Each connecting rod 44 is connected by a pin 49 to the respective piston 32.
  • the volume of the pump chamber 30 is delimited on one side by an internal cap 47 (forming part of a cylinder head 46) and on the other side by the diaphragm 35.
  • the thrust necessary for the pumping of the liquid (water) pressure is exerted by the diaphragm 35, which is preferably made of an elastic material (typically rubber, and is subject to a reciprocating movement (typically induced by the crank mechanism activated by the drive shaft 42 so that the volume of the pump chamber 30 assumes a size variable between a maximum and a minimum (the difference of which defines the displacement); the liquid enters and leaves in a reciprocating motion, the flow in the chamber 30 being controlled by automatically-opening single-acting valves 53 and 54, respectively aspiration and delivery.
  • the pressure energy is transferred to the liquid to be pumped into the chamber 30 directly by the diaphragm 35, which is pushed by the piston 32, in part by direct action, and in part by the mass of thrust oil enclosed in the thrust chamber 37.
  • Each of the two pump chambers 30 communicates with an aspirating conduit 51 and with a delivery conduit 52, with the intake valve 53 and outlet 54 valve being interposed.
  • the aspirating conduit 51 is common to both chambers 30, as is the delivery conduit 52.
  • the lateral wall comprises one or more open-top grooves 48 (two in the figures) formed on the guide surface 31 b, and facing the lateral surface 32b of the piston, which develops substantially axially.
  • Each groove 48 has a rear end 48b connected with the rear tank 40 and a front end 48a which, when the piston 32 is located in the neighborhood of the piston-cylinder, exceeds, by a short stretch B, the sealing edge of the front 33a and communicates with the thrust chamber 37.
  • the chamber 37 is isolated from the tank 40, and the delivery stroke develops, as the chamber is hermetically closed, apart from, as mentioned, the leakage towards the tank 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP14187054.3A 2013-11-08 2014-09-30 Pompe à diaphragme volumétrique alternative pour liquides Active EP2871362B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000083A ITRE20130083A1 (it) 2013-11-08 2013-11-08 Pompa volumetrica alternativa a membrana per liquidi

Publications (2)

Publication Number Publication Date
EP2871362A1 true EP2871362A1 (fr) 2015-05-13
EP2871362B1 EP2871362B1 (fr) 2016-06-15

Family

ID=49780228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14187054.3A Active EP2871362B1 (fr) 2013-11-08 2014-09-30 Pompe à diaphragme volumétrique alternative pour liquides

Country Status (4)

Country Link
EP (1) EP2871362B1 (fr)
ES (1) ES2584284T3 (fr)
IT (1) ITRE20130083A1 (fr)
PL (1) PL2871362T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108613004A (zh) * 2018-07-03 2018-10-02 江苏艾联新能源智能装备有限公司 一种自动化浸油、甩油一体机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11434902B2 (en) * 2019-03-11 2022-09-06 Ingersoll-Rand Industrial U.S., Inc. Electric diaphragm pump with offset slider crank

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004106884A1 (fr) * 2003-05-16 2004-12-09 Wanner Engineering, Inc. Pompe a diaphragme
US20070140878A1 (en) * 2005-12-20 2007-06-21 Milton Roy Euroe Hydraulically-actuated diaphragm pump with a leak compensation device
EP2085614A1 (fr) * 2008-01-31 2009-08-05 J. Wagner AG Dispositif de pompage, en particulier pompe à double membrane avec entrainement par pompe à piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004106884A1 (fr) * 2003-05-16 2004-12-09 Wanner Engineering, Inc. Pompe a diaphragme
US20070140878A1 (en) * 2005-12-20 2007-06-21 Milton Roy Euroe Hydraulically-actuated diaphragm pump with a leak compensation device
EP2085614A1 (fr) * 2008-01-31 2009-08-05 J. Wagner AG Dispositif de pompage, en particulier pompe à double membrane avec entrainement par pompe à piston

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108613004A (zh) * 2018-07-03 2018-10-02 江苏艾联新能源智能装备有限公司 一种自动化浸油、甩油一体机

Also Published As

Publication number Publication date
PL2871362T3 (pl) 2016-12-30
EP2871362B1 (fr) 2016-06-15
ES2584284T3 (es) 2016-09-26
ITRE20130083A1 (it) 2015-05-09

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