EP1443209A2 - Pompe á eau - Google Patents

Pompe á eau Download PDF

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Publication number
EP1443209A2
EP1443209A2 EP03078651A EP03078651A EP1443209A2 EP 1443209 A2 EP1443209 A2 EP 1443209A2 EP 03078651 A EP03078651 A EP 03078651A EP 03078651 A EP03078651 A EP 03078651A EP 1443209 A2 EP1443209 A2 EP 1443209A2
Authority
EP
European Patent Office
Prior art keywords
piston
pump
idle
eccentric cam
interposed
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Withdrawn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
EP03078651A
Other languages
German (de)
English (en)
Other versions
EP1443209A3 (fr
Inventor
Fulvio Montipo'
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.)
Interpump Engineering SRL
Original Assignee
Interpump Engineering 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 Interpump Engineering SRL filed Critical Interpump Engineering SRL
Publication of EP1443209A2 publication Critical patent/EP1443209A2/fr
Publication of EP1443209A3 publication Critical patent/EP1443209A3/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Withdrawn legal-status Critical Current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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams

Definitions

  • the present invention relates to a hydraulic pump, a typical but non-exclusive use for which is in the hobby and do-it-yourself field and in the semi-professional field.
  • the purpose of the invention is to patent a water pump and the apparatus which incorporates it, such as the said jet washers or other similar implementations.
  • the main object of the present invention is to provide a water pump able to overcome the aforedefined problem, i.e. able to operate with improved reliability, and which is of low cost, with consequent corresponding greater reliability and lower cost of the apparatus which incorporates it.
  • Another object of the invention is to achieve said objective within the context of a simple, compact and lightweight construction which is particularly reliable and of long life, as will be clarified hereinafter.
  • the pump comprises a casing carrying a rotatable shaft to be connected to a suitable drive unit, and having at least one cylindrical eccentric cam for operating at least one radial piston combined with elastic return means, and of which the operative chamber is connected to two headers, namely for intake and delivery respectively, by way of interposed automatic non-return valves.
  • At least two diametrically opposing pistons are provided, working in phase opposition.
  • the generally linear zone of mutual contact between said piston and said thrust member is misaligned with the longitudinal axis of the piston.
  • the thrust member presents only limited sliding on the piston head, because by virtue of the piston rotation, said thrust member acts on gradually differing peripheral regions of the piston.
  • a holed circular flange 10 provided to connect the pump to a suitable drive unit, generally an electric motor (not shown), the output shaft of which is indicated by 9 in Figure 2.
  • Said shaft 9 is rotatably mounted within said recess 2 via a bearing 8, beyond which it presents an eccentric cam 7 on which an idle annular thrust member 6 is mounted, described hereinafter.
  • the lesser-diameter central portion of the hole 5 communicates with an intake port 55 provided in the rib 3 ( Figures 1 and 4), the two greater-diameter terminal portions each containing an automatic intake valve 50 ( Figure 1).
  • the hole 4 has a lesser-diameter central portion which communicates with a delivery port 44 provided in the rib 3 ( Figures 1, 3 and 4), and two greater-diameter terminal portions which each contain an automatic delivery valve 40.
  • each delivery valve 50 comprises an annular body 51 which provides the seat for a cup-shaped valve 52, a thrust spring 53 arranged to constantly force the valve 52 towards its seat, and a generally cage-shaped guide element 54 which contains said valve 52 and said spring 53, and maintains said annular body 51 in position.
  • the guide element 54 is maintained in position by an intake and delivery header 56 ( Figures 1-4) which is fixed onto the respective side of the casing 1 by screws 57 ( Figures 3 and 4) by way of a gasket 58 ( Figure 3).
  • Two identical headers 56 are provided, with each of which an intake valve 50 and a delivery valve 40 are associated.
  • the delivery valve 40 is identical to the intake valve 50.
  • the two differ by being mounted mutually inverted, and are hence interchangeable.
  • each delivery valve comprises an annular body 41 similar to 51, a cup valve 42 similar to 52, a thrust spring 43 similar to 53, a guide element 44 similar to 54, and a gasket 48 similar to 58.
  • headers 56 are identical, each comprising an elongate flat profiled body having a through longitudinal conduit closed by two terminal plugs 60.
  • Said elongate body has, at its ends, two lateral ports communicating with the seats of the valves 50 and 40, and at its centre a cylindrical dome 59 which opens towards the eccentric cam 7 of the shaft 9.
  • Said dome 59 is coaxial with a hole of differential cross-section which is provided in the casing 1, to open within the recess 2, and has its longitudinal axis perpendicular to that of the shaft 9 ( Figure 1).
  • a jacket 12 acting as a guide for a flat headed piston 13 is housed in said hole and is retained therein by the respective header 56 by way of an interposed gasket 11.
  • the piston 13 is shaped as a cup which opens towards the respective header, against its base there resting the idle annular thrust member 6. Inside the piston 13 there is positioned a return spring 17 located between the base of said cup and a guide and friction reduction element 18 contained in the centre of the dome 59 of the header 56.
  • transverse dimensions of said guide element 18, which is of generally cylindrical shape, are less than the inner diameter of the cavity of the piston 13, so that said cavity can fill with water.
  • this consists of a ball bearing, well visible in Figure 1.
  • the outer face of the outer ring of said bearing is cylindrical, but there is nothing to prevent it from being shaped differently, for example as an annular sector of a spherical surface, of castor type.
  • the central or median point of the generally linear zone of mutual contact between the thrust member 6 and the head of the piston 13 is misaligned with respect to the longitudinal axis of said piston 13, namely towards the mouth of the recess 2 of the casing 1.
  • said misalignment is such that the outer side of the thrust member, or bearing, 6 is virtually tangential to the outer surface of the piston 13.
  • the described pump operates as follows.
  • the intake piston 13 presses against the bearing 6 with a force generally equal to the load of the respective return spring 17, and the delivery piston 13 presses against it with as force generally equal to the sum of the load of the spring plus the thrust determined by the pressure of the pumped water.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP03078651A 2003-01-16 2003-11-20 Pompe á eau Withdrawn EP1443209A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE20030001 2003-01-16
ITRE20030001 ITRE20030001U1 (it) 2003-01-16 2003-01-16 "pompa per acqua"

Publications (2)

Publication Number Publication Date
EP1443209A2 true EP1443209A2 (fr) 2004-08-04
EP1443209A3 EP1443209A3 (fr) 2005-08-31

Family

ID=29267110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03078651A Withdrawn EP1443209A3 (fr) 2003-01-16 2003-11-20 Pompe á eau

Country Status (2)

Country Link
EP (1) EP1443209A3 (fr)
IT (1) ITRE20030001U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10968899B2 (en) 2015-11-20 2021-04-06 Positec Power Tools (Suzhou) Co., Ltd. Pump unit and handheld high pressure washer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491327A (en) * 1937-03-19 1938-08-31 John Maurice Towler Improvements in and relating to reciprocating ram pumps
US3570372A (en) * 1968-11-29 1971-03-16 John F Campbell Radial pump with hydrostatic load balance
US3885893A (en) * 1973-04-17 1975-05-27 Fichtel & Sachs Ag Multiple cylinder pump
US4997344A (en) * 1988-06-15 1991-03-05 Deere & Company Rotor bearing pre-load for a radial piston pump
US5156531A (en) * 1988-09-15 1992-10-20 Zahnradfabrik Friedrichshafen, Ag. Radial piston pump
DE4310062A1 (de) * 1993-03-27 1994-09-29 Teves Gmbh Alfred Radialkolbenmaschine
US6213729B1 (en) * 1997-03-13 2001-04-10 Luk Fahrzeung-Hydraulik Gmbh & Co., Kg Suction-throttled pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491327A (en) * 1937-03-19 1938-08-31 John Maurice Towler Improvements in and relating to reciprocating ram pumps
US3570372A (en) * 1968-11-29 1971-03-16 John F Campbell Radial pump with hydrostatic load balance
US3885893A (en) * 1973-04-17 1975-05-27 Fichtel & Sachs Ag Multiple cylinder pump
US4997344A (en) * 1988-06-15 1991-03-05 Deere & Company Rotor bearing pre-load for a radial piston pump
US5156531A (en) * 1988-09-15 1992-10-20 Zahnradfabrik Friedrichshafen, Ag. Radial piston pump
DE4310062A1 (de) * 1993-03-27 1994-09-29 Teves Gmbh Alfred Radialkolbenmaschine
US6213729B1 (en) * 1997-03-13 2001-04-10 Luk Fahrzeung-Hydraulik Gmbh & Co., Kg Suction-throttled pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10968899B2 (en) 2015-11-20 2021-04-06 Positec Power Tools (Suzhou) Co., Ltd. Pump unit and handheld high pressure washer
USRE49589E1 (en) 2015-11-20 2023-07-25 Positec Power Tools (Suzhou) Co., Ltd Pump unit and handheld high pressure washer

Also Published As

Publication number Publication date
ITRE20030001V0 (it) 2003-01-16
EP1443209A3 (fr) 2005-08-31
ITRE20030001U1 (it) 2004-07-17

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