EP0093691B1 - Pompe à piston pour liquides - Google Patents

Pompe à piston pour liquides Download PDF

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Publication number
EP0093691B1
EP0093691B1 EP83810165A EP83810165A EP0093691B1 EP 0093691 B1 EP0093691 B1 EP 0093691B1 EP 83810165 A EP83810165 A EP 83810165A EP 83810165 A EP83810165 A EP 83810165A EP 0093691 B1 EP0093691 B1 EP 0093691B1
Authority
EP
European Patent Office
Prior art keywords
piston
cover
cylinder
during
neck
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.)
Expired
Application number
EP83810165A
Other languages
German (de)
English (en)
Other versions
EP0093691A1 (fr
Inventor
Kurt Stauffer
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
Priority to AT83810165T priority Critical patent/ATE17158T1/de
Publication of EP0093691A1 publication Critical patent/EP0093691A1/fr
Application granted granted Critical
Publication of EP0093691B1 publication Critical patent/EP0093691B1/fr
Expired 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
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F7/00—Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein
    • 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
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston

Definitions

  • the invention is based on a piston pump for liquids, with a cylinder in which a piston and a piston cover separate from the piston, provided on the suction side of the piston and connected to the piston rod, are accommodated in a reciprocating manner, by means of which the reciprocating movement moves Liquid is sucked into the working chamber of the cylinder via an inlet and is pressed out of it via an outlet, the piston being perforated parallel to its axis and the piston cover having a smaller outside diameter than the inside diameter of the cylinder and the outside diameter of the piston and with the piston rod is connected in such a way that it lies tightly against the piston during the pressure and suction stroke and closes off the holes in the piston and is at a distance from the piston during the return stroke, as a result of which a space for the flow of the liquid passes through between the piston and the piston cover the piston is created.
  • a piston pump with a cylindrical body, in which a perforated piston displaceably arranged on a piston rod moves, is known from FR-A 1 323618.
  • a perforated disk which functions as a piston cover, is fastened, by means of which the path of displacement of the piston on the piston rod is limited.
  • DE-A 2 628 985 describes a liquid pump which likewise has a cylindrical body in which a perforated piston which is displaceably arranged on a piston rod and has a suction valve plate acting as a piston cover is arranged.
  • the suction valve plate has a smaller outside diameter than the inside diameter of the cylinder and the outside diameter of the piston.
  • the suction valve plate is fixed on the piston rod by means of a nut screwed onto the free end of the piston rod via a limiting plate and a spacer sleeve.
  • such an arrangement is costly and, moreover, it does not ensure that the hole in the piston is properly sealed.
  • the invention has for its object to provide a piston pump for liquids whose manufacturing costs are smaller than those of the liquid pump according to the prior art, wherein also 100 0 / o tightness is to be achieved during operation in such a piston pump, to increase performance.
  • the first feature eliminates the need for. B. the surface grinding of flat sealing surfaces, and by the second additional components are saved.
  • the piston pump shown in the figures can be used for various liquids, such as water, milk, cream.
  • the piston pump consists of a cylinder 1 and two end parts 14 and 16 screwed to the cylinder 1 by means of connecting screws 21.
  • One 14 of the end parts is provided with an inlet 15 for the liquid.
  • the piston 2 with the piston rod 11 is arranged to be reciprocable in the cylinder 1. Due to the back and forth movement, the liquid is sucked in via the inlet 15 in the first connection part 14 into the working space of the cylinder 1 and pressed out of the same via an outlet 17 provided in the cylinder 1 into a pressure line, not shown.
  • the piston 2 is provided on its peripheral surface with annular seals 4.
  • the piston 2 is further perforated parallel to its axis, as can be seen from FIG. 3.
  • the number of holes 3 can advantageously be three.
  • a circular piston cover 5 separate from the piston 2 is provided on the suction side of the piston 2, a circular piston cover 5 separate from the piston 2 is provided.
  • the diameter of the piston cover 5 does not exceed the diameter of the piston 2; it is advantageously a few millimeters smaller than that of the piston 2.
  • the piston cover 5 has a neck 6 with an internal thread 7 which passes through a central bore 22 of the piston 2 with play.
  • the Neck 6 of the piston cover 5 is screwed into a pin 12 with an external thread 13 of the piston rod 11.
  • the diameter of the piston rod 11 is larger than that of the pin 12 with an external thread 13 and that of the bore 22 in the piston 2.
  • the outside of the neck is coated with Teflon 8 against abrasion.
  • connection of the piston cover 5 with the piston rod 11 can be adjusted as desired.
  • This connection is such that the piston cover 5 is at a distance from the piston 2 during the return stroke of the piston 2 against the first end part 14 with inlet 15.
  • an intermediate space 24 is formed between the piston 2 and the piston cover 5 for the liquid to flow through the piston 2.
  • the distance between the piston cover 5 and the piston 2 is at most 2 mm and is given in that the piston rod 11 is supported against the pressure side of the piston 2 and presses it during the return stroke.
  • the piston cover 5 lies close to the piston 2, so that the holes 3 in the piston 2 are closed.
  • the piston 2 is pulled through the piston rod 11, a gap being formed between the edge of the piston rod 11 facing the piston 2 and the pressure side of the piston 2.
  • the liquid in the working space of the cylinder 1 flows through the gap 24 between the piston cover 5 and the piston 2 and through the holes 3 in Piston 2 in the working space of the cylinder 1, which is limited on the one hand by the pressure side of the piston 2.
  • the liquid is not displaced through the piston cover 5 through the inlet 15 from the working space of the cylinder 1, because the inlet consists of two mutually perpendicular channels, which have a relatively small diameter, so that the liquid through the inlet 15 is practical cannot leak.
  • the liquid can also not flow through the holes 3 in the piston 2, because they are sealed off by the piston cover 5.
  • the piston 2 is provided with a raised edge 9 on its suction side.
  • the edge of the piston cover is folded inwards on its side facing the piston 2.
  • the folded edge 10 of the piston cover 5 comes to rest against the raised edge 9 of the piston 2, so that the piston 2 forms a tight fit with the piston cover 5.
  • the outside diameter of the piston cover 5 is somewhat smaller than the outside diameter of the piston 2.
  • the second end part 16 has a sealed bore 19 through which the piston rod 11 is passed.
  • the piston rod 11 is then connected to a drive shaft 23 of an electric motor (not shown), advantageously eccentrically. With 18 and 20 seals are designated.
  • Such a piston pump can, for. B. be used in a device for making whipped cream.
  • the cream with air is fed into the pump through the inlet.
  • the piston which is driven by an electric motor at 1500 rpm, makes reciprocating movements, with the stroke length varying in the range of approximately 10 mm.
  • the cream with air sucked into the cylinders is forced out of the cylinder into a homogenizer, in which the blow occurs.
  • the pressure in the piston pump is around 6.7 atm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (2)

1. Pompe à piston pour liquides, comprenant un cylindre (1) dans lequel sont disposés de façon mobile en va-et-vient un piston (2) et un couvercle de piston (5), ce dernier étant séparé du piston (2), sur le côté d'aspiration duquel il se trouve, et étant relié à la tige de piston (11), les mouvements de va-et-vient provoquant l'aspiration du liquide dans l'espace de travail du cylindre (1) par une entrée (15) et son refoulement hors de cet espace par une sortie (17), le piston (2) étant perforé parallèlement à son axe, et le couvercle de piston (5), dont le diamètre extérieur est plus petit que le diamètre intérieur du cylindre (1) et que le diamètre extérieur du piston (2), étant relié à la tige de piston (11) de façon telle que, lors de la course d'aspiration et de refoulement du piston (2), il s'appuie jointive- ment contre ce piston et bouche les perforations (3) de celui-ci, tandis que, lors de la course de retour du piston (2), le couvercle se trouve à distance du piston de façon qu'un espace (24) s'établit entre le piston (2) et le couvercle de piston (5) pour laisser passer le liquide à travers le piston (2), caractérisée en ce que le piston (2) présente, sur son côté aspirant, un rebord réhaussé (9), tandis que le couvercle de piston (5) présente un bord anglé vers l'intérieur (10) sur son côté dirigé vers le piston (2), de façon telle que, pendant sa course d'aspiration et de refoulement, le piston (2) forme, en relation avec le couvercle de piston (5), un siège fixe centré, et en ce que le couvercle de piston (5) est muni d'un cou (6) qui passe librement à travers un perçage (22) du piston (2) et qui présente un filetage intérieur (7) dans lequel est vissé un tampon (12), muni d'un filetage extérieur (13), de la tige de piston.
2. Pompe à piston selon la revendication, caractérisée en ce que le cou (6) du couvercle de piston (5) est revêtu de polytétrafluorétylène (8).
EP83810165A 1982-04-21 1983-04-20 Pompe à piston pour liquides Expired EP0093691B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810165T ATE17158T1 (de) 1982-04-21 1983-04-20 Kolbenpumpe fuer fluessigkeiten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH242082 1982-04-21
CH2420/82 1982-04-21

Publications (2)

Publication Number Publication Date
EP0093691A1 EP0093691A1 (fr) 1983-11-09
EP0093691B1 true EP0093691B1 (fr) 1985-12-27

Family

ID=4233390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810165A Expired EP0093691B1 (fr) 1982-04-21 1983-04-20 Pompe à piston pour liquides

Country Status (3)

Country Link
EP (1) EP0093691B1 (fr)
AT (1) ATE17158T1 (fr)
DE (1) DE3361613D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5127804A (en) * 1989-08-09 1992-07-07 Innovative Bicycle Products, Inc. Bicycle seat-tube pump with one-way valves
US5035440A (en) * 1989-08-09 1991-07-30 Chappell International, Inc. Pump
FR2689570B1 (fr) * 1992-04-07 1994-05-27 Serac Group Pompe volumetrique.
DE4442639A1 (de) 1994-11-30 1996-06-13 Peca Verbundtechnik Schalungselement
FR2817848B1 (fr) * 2000-12-12 2003-03-07 Rexam Sofab Micropompe electronique

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR489088A (fr) * 1917-02-16 1918-12-13 Georges Constantinesco Perfectionnements aux pompes
DE462509C (de) * 1926-03-10 1928-07-13 John Coard Franke Verfahren zum Heben von Fluessigkeiten mittels Pumpen mit Schoepfkolben
CH253083A (de) * 1946-05-10 1948-02-15 Maier Emilio Mit Trägheitskraft arbeitende Kolbenpumpe.
US2933050A (en) * 1957-05-23 1960-04-19 Reynolds Oil Well Pumps Inc Oil well pump
FR1323618A (fr) * 1962-02-27 1963-04-12 Perfectionnement aux pompes à piston
FR1592548A (fr) * 1968-06-21 1970-05-19
US3536424A (en) * 1968-11-12 1970-10-27 Hydro Seal Ltd Pump and piston assembly therefor
DE2263363C3 (de) * 1972-12-23 1975-10-09 Canada Tiefbohrgeraete- Und Maschinenfabrik Ing. S. Nadel U. A. Nadel, Wien Bodenventil für eine Tiefpumpe
DE2628985A1 (de) * 1976-06-28 1977-12-29 Speck Kolbenpumpen Fabrik Zylinder-kolbenanordnung fuer eine fluessigkeitspumpe

Also Published As

Publication number Publication date
ATE17158T1 (de) 1986-01-15
EP0093691A1 (fr) 1983-11-09
DE3361613D1 (en) 1986-02-06

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