EP0108944B1 - Verdrängerteil einer Kolbenpumpe - Google Patents

Verdrängerteil einer Kolbenpumpe Download PDF

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Publication number
EP0108944B1
EP0108944B1 EP83110319A EP83110319A EP0108944B1 EP 0108944 B1 EP0108944 B1 EP 0108944B1 EP 83110319 A EP83110319 A EP 83110319A EP 83110319 A EP83110319 A EP 83110319A EP 0108944 B1 EP0108944 B1 EP 0108944B1
Authority
EP
European Patent Office
Prior art keywords
piston
blind hole
threaded
recess
adapter
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
EP83110319A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0108944A1 (de
Inventor
Wilhelm Libhafsky
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.)
Feldmuehle AG
Original Assignee
Feldmuehle AG
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 Feldmuehle AG filed Critical Feldmuehle AG
Priority to AT83110319T priority Critical patent/ATE18790T1/de
Publication of EP0108944A1 publication Critical patent/EP0108944A1/de
Application granted granted Critical
Publication of EP0108944B1 publication Critical patent/EP0108944B1/de
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
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/144—Adaptation of piston-rods
    • F04B53/147—Mounting or detaching of piston rod

Definitions

  • the invention relates to a displacement part of a piston pump for abrasive and / or corrosive liquids, consisting of a piston rod and a piston attached to it by means of a releasable connection made of an oxide-ceramic material, the piston having a blind hole running in the direction of the piston head.
  • Pump pistons of high-pressure pumps for washing units are subject to high loads.
  • the pumps are generally designed as piston pumps, in which 2-6 cylinders work on a crankshaft. They reach pressures between 80 and 180 bar. lie. Sharp alkalis are usually used as the cleaning liquid. The temperatures of the cleaning liquids are 80 and more degrees C.
  • the coated or hard chrome-plated steel sleeves previously used as pistons were connected to the piston rod by means of a clamping screw. As an alternative to these steel sleeves, corresponding sleeves made of sintered oxide ceramic were used, which were connected in an analogous manner.
  • a stainless material i.e. generally a high-alloy steel, was used as the metal for the piston rod.
  • the arrangement of the O-ring for the seal also required grinding a chamfer in the engagement area of the O-ring in the ceramic tube in order to prevent the risk of the O-ring being crushed during assembly.
  • the crushing resulted in a defective seal, which led to corrosion inside the piston or to the piston being destroyed by higher internal pressure in the suction stroke.
  • Even the attachment of the chamfer did not completely prevent the risk of an O-ring being crushed during quick assembly. Since the pistons have to be loosened after a certain working time in order to replace the worn sealing sleeves that slide on this piston, it is absolutely essential that the connection between the piston and the piston rod cannot corrode, i. H. must be completely separated from the medium.
  • oxide ceramic materials or oxide ceramics in the sense of the present invention is the short name for ceramics of pure oxides, oxide compounds and oxide mixtures, insofar as they are almost free of SiO 2 , this term serving as a differentiation from conventional silicate ceramics.
  • this term is to be understood as meaning sintered products made from the oxides of aluminum, beryllium, magnesium, zirconium and thorium as well as spinel, ie MgO, A1 2 0 3 .
  • the term also includes the titanates and uranium oxide, rare earth oxides, and some heavy metal oxides, all of which are used in high purity. However, the term high purity does not exclude that certain percentages of several oxides are mixed together and then sintered.
  • Oxide ceramic materials such as aluminum oxide
  • Oxide ceramic materials are sintered according to the aluminum oxide content of the materials at temperatures above 1,500 ° C.
  • the parts manufactured as green bodies initially shrink considerably. H. in the range of 18 to 23%.
  • this shrinkage is not completely uniform everywhere, especially not if there are different wall thicknesses.
  • such a complex method cannot be implemented for a simple body such as that represented by a pump piston for reasons of price.
  • the prior art therefore envisaged sintering ceramic tubes, which were ground on both faces and could be screwed onto the piston rod by means of a bolt.
  • the disadvantage of this construction is the complicated sealing, without which the piston cannot be released. It was also necessary to grind both end faces.
  • the invention is therefore based on the object of finding a connection between the piston and the piston rod, which can be released after a long period of time even when used in corrosive and abrasive media, and to reduce the grinding work during piston production.
  • the invention has a number of advantages. First the number after the sintering process. the area of the piston to be machined reduced to two, d. H. only the outer surface and the end face of the piston foot have to be machined.
  • the blind hole and the recess are made in the piston in the green state and, like the piston crown, do not require any reworking after the sintering process.
  • the tolerances of the blind hole and the recess are therefore relatively large, because the required fit, that is to say the alignment of the piston, only takes place on the adapter.
  • a preferred embodiment of the invention provides for the adapter to center the piston foot. It is therefore an external centering of the piston, in which there is enough play for the threaded elements without losing the accuracy of the centering.
  • the adapter is expediently provided with a threaded pin which is screwed through the blind hole into the threaded piece.
  • the threaded piece itself expediently consists of a simple piece of round steel which is drilled perpendicularly to its longitudinal extent and is threaded. Instead of a round steel, any profile steel can be used that has a threaded hole. It is only important that the threaded pin of the adapter has enough play in the blind hole and that the threaded piece in the recess has enough play to allow attachment.
  • the adapter is to be connected to the piston rod, which is expediently carried out by plugging the piston rod onto or into the adapter; however, it is also possible to provide this connection as a screw connection.
  • the piston 2 made of sintered oxide ceramic has a chamfer 17 in the region of the piston head 3, to which the jacket 6 of the piston 2 is connected.
  • a blind hole 5 extends from the piston foot 4 in the direction of the piston head 3, which was introduced in the green state of the piston 2, without a machining step following after the sintering process. This blind hole 5 is cut perpendicularly from the recess 7, which was also made by drilling in the green state of the piston 2.
  • this recess 7 is the threaded piece 8, a piece of round steel chamfered on both sides, which has been provided with a threaded bore 18 in the center.
  • the threaded pin 10, which is part of the adapter 9, is screwed into the threaded bore 18 of the threaded piece 8 and thereby connects the piston 2 to the adapter 9.
  • the adapter 9 in turn is provided with a threaded shoulder 11 on the side opposite the threaded pin 10 which the piston rod 1 is screwed on.
  • An alternative solution is shown in FIG. 2, where a machine screw 12 is used instead of the threaded pin 10, which penetrates the bore 13 in the adapter 9 and engages in the threaded piece 8.
  • a countersink 14 connects to the bore 13 and receives the head of the machine screw 12.
  • the adapter 9 is provided with a shoulder 16 onto which the piston rod 1, which is designed as a tube, is pushed and fastened by means of a notch pin 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)
  • Fertilizing (AREA)
  • Lubricants (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
EP83110319A 1982-10-19 1983-10-15 Verdrängerteil einer Kolbenpumpe Expired EP0108944B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110319T ATE18790T1 (de) 1982-10-19 1983-10-15 Verdraengerteil einer kolbenpumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3238667 1982-10-19
DE19823238667 DE3238667A1 (de) 1982-10-19 1982-10-19 Verdraengerteil einer kolbenpumpe

Publications (2)

Publication Number Publication Date
EP0108944A1 EP0108944A1 (de) 1984-05-23
EP0108944B1 true EP0108944B1 (de) 1986-03-26

Family

ID=6176063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110319A Expired EP0108944B1 (de) 1982-10-19 1983-10-15 Verdrängerteil einer Kolbenpumpe

Country Status (5)

Country Link
EP (1) EP0108944B1 (da)
AT (1) ATE18790T1 (da)
DE (2) DE3238667A1 (da)
DK (1) DK452983A (da)
FI (1) FI73793C (da)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741254A (en) * 1986-06-12 1988-05-03 Taylor Julian S Pump plunger
DE3702446A1 (de) * 1987-01-28 1988-08-11 Kaercher Gmbh & Co Alfred Hochdruckreinigungsgeraet mit einer taumelscheibenkolbenpumpe
DE3914333A1 (de) * 1989-04-29 1990-10-31 Hoechst Ceram Tec Ag Pumpenkolben fuer axialkolbenpumpen
DE102012219348A1 (de) * 2012-10-23 2014-04-24 Robert Bosch Gmbh Pumpenelement für ein Hydraulikaggregat mit einem Pumpenkolben
IT201800004176A1 (it) * 2018-04-03 2019-10-03 Pistone in materiale ceramico
IT201900006680A1 (it) * 2019-05-09 2020-11-09 Annovi Reverberi Spa Pistone in materiale ceramico

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1195546A (en) * 1916-08-22 Pump-piston
DE2939284C2 (de) * 1979-09-28 1982-08-26 Feldmühle AG, 4000 Düsseldorf Verfahren zum Herstellen von Kolben aus gesinterter Oxidkeramik

Also Published As

Publication number Publication date
FI73793C (fi) 1987-11-09
FI833740L (fi) 1984-04-20
FI833740A0 (fi) 1983-10-14
DE3362709D1 (en) 1986-04-30
DK452983A (da) 1984-04-20
DK452983D0 (da) 1983-09-30
ATE18790T1 (de) 1986-04-15
DE3238667A1 (de) 1984-04-26
FI73793B (fi) 1987-07-31
EP0108944A1 (de) 1984-05-23

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