Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/10—Outer members for co-operation with rotary pistons; Casings
  • F01C21/102—Adjustment of the interstices between moving and fixed parts of the machine by means other than fluid pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
  • F04C2/084—Toothed wheels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2230/00—Manufacture
  • F04C2230/60—Assembly methods
  • F04C2230/602—Gap; Clearance
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2230/00—Manufacture
  • F04C2230/80—Repairing methods

Definitions

• the invention relates to a pump with one or more rotatable pistons according to the preamble of claim 1 and a method for compensating wear-related wear of an outer polymer layer of a pump piston according to the preamble of claim 12.
• DE 20 02 518 C3 shows an elastomer coating for rotary lobes of pumps which are used for the conveyance of solids-laden suspensions.
• Such a coating can yield elastically, provided that solid particles penetrate into the gap between the piston and the wall or into the gap between the rotating pistons, which are as closely spaced as possible from one another. This prevents the rotational movement from being blocked by solids.
• EP 0 599 333 B1 therefore shows piston parts which can be replaced individually without having to replace the entire piston.
• the wing tips are designed as push-on sealing strips which are fastened in a dovetail-shaped guide and can be replaced if necessary.
• the manufacturing effort of such a configuration is very high.
• all the piston tips must be replaced simultaneously, so that the overall maintenance effort for such a replacement is increased, since the number of parts to be replaced has increased considerably compared to an exchange of a piston.
• the formation of such a dovetail guide is very complex in terms of production technology.
• the invention is based on the problem of counteracting the wear-related wear of an outer polymer layer of a pump piston with as little effort as possible.
• an adjustment of an outer wear layer of the piston is made possible.
• a support body into the recess provided, one can Material thinning of the polymer layer are taken into account in such a way that the recess is widened by introducing the support body and the polymer layer is thereby stretched to approximately its original thickness.
• Such a recess can extend both essentially along an abutment line of the piston against a wall of the pump chamber, i.e.
• FIG. 1 is a schematic top view of a two-bladed rotary piston pump, each with a polymer layer surrounding the piston and axially parallel supporting bodies,
• FIG. 2 shows a piston according to FIG. 1 in a perspective, partially broken-open representation
• Fig. 3 shows a twisted piston with its maximum radial
• Fig. 4 shows the schematic sequence of the original state, the outside worn polymer layer and expanded polymer layer by introducing an enlarged support body in a schematic, broken plan view, therein
• Fig. 4c enlarged the piston with the support body inserted
• FIG. 5 shows a rotary piston pump with a multi-winged and flexible rotary piston
• FIG. 6 shows a piston in a view similar to that in FIG. 1, the outer circumference of the piston and the polymer layer being matched to one another and held against one another in a rotationally secured manner 7 shows a view similar to FIG. 2 of a piston which has recesses for support bodies at axially spaced edge regions, the support bodies introduced extending transversely to the axial extent,
• FIG. 8 is a plan view along the line VIII-VIII in FIG. 7.
• the pump 1 according to the embodiment shown in FIG. 1 has a pump chamber 2 in which two pistons 3, 4 of the same design roll on one another and convey a liquid from an inlet gap 5 to an outlet opening 6.
• the pistons 3 and 4 are each formed with two leaves, but this is not mandatory.
• the pistons run in the direction of the arrows 7, 8 about the axes of rotation 9, 10 and are detachably held on the shafts 13, 14 by keys 11, 12.
• the wing tips 3a, 3b and 4a, 4b are guided past the walls 15, 16 of the pump chamber 2 and the respective other pistons 3 and 4 during the rotation at a close distance.
• the pistons 3, 4 are circumferentially surrounded by an elastic polymer layer, in particular an elastomer layer, at least on the highly loaded wing tips 3a, 3b or 4a, 4b. This seals the pistons 3, 4 against one another and against the walls 15, 16 of the pump chamber 2.
• an elastic polymer layer in particular an elastomer layer
• a recess is arranged in the wing tips 3a, 3b, 4a, 4b within the elastomer layer 17, 18, which extends parallel to the axis of rotation 9 and 10 and for receiving a support body 20 is provided.
• the recess 19 is complete according to the embodiment arranged within the elastomer layer 17 or 18. It is also possible to arrange such a recess 19 between the elastomer layer and the, in particular metallic, piston located underneath.
• FIG. 3 shows a twisted piston 103, which is likewise fixed on a shaft 113 by means of a feather key 111 and is rotatable about an axis of rotation 109.
• the recesses 119 are made spirally in the wing tips 103a, 103b, 103c, which also extend spirally with respect to the shaft 113.
• the introduced support bodies 120 shown here can be bendable or can be manufactured with a corresponding curvature.
• the piston 103 has three wings. Again, this is not mandatory.
• a plurality of pistons 103 can slide on one another in a pump 1.
• a multi-winged piston (eight-winged) 203 of a cell pump is shown, which is held on a shaft 213 and rotates in the direction 207 around an axis of rotation 209.
• the piston 203 shows a surface layer which consists entirely of a polymer and essentially completely surrounds the piston 203.
• recesses 219 are each formed axially parallel, which can serve to receive support bodies 220.
• FIG. 6 * shows a further piston 303, which overall corresponds essentially to the piston 3 in FIG. 1, but has indentations 321 and 322 on the wing tips 303a and 303b, in order thereby to provide a secure hold against the polymer layer 317 and to also ensure that the polymer layer 317 is secured against rotation.
• a recess 319 which is designed as an axially parallel channel, is shown before the introduction of a support body.
• a flattening of the outer polymer layer 317 due to wear is visible here.
• the situation after inserting a support body 320 is shown on the upper wing tip 303b, as a result of which the recess 319 is widened and thus causes the surrounding elastomer layer to expand in the direction of the arrow 323.
• a piston 403 is shown, the recesses 419 extending perpendicular to the axis of rotation 409, so that by introducing support bodies 420 an expansion of the upper and lower boundary plane, which is perpendicular to the axis of rotation 409, is effected, which then in place or in In addition to widening the wing tips, it is also possible to widen the transverse surfaces.
• FIG. 4 shows the sequence of the method according to the invention for compensating for wear of the outer polymer layer: in FIG. 4a the polymer layer 17 is also intact in the area of the wing tip 3a and has its full original width.
• the polymer layer 17 is thinned, a gap is formed between the wall 15 and the outer boundary of the piston 3.
• the support body 20 is removed and a support body 20a which is widened in circumference is inserted, which due to its larger diameter Expansion of the recess 19 and thus also the surrounding polymer layer 17 causes so that it closes the gap formed again (Fig. 4c).
• Either an existing support body 20 can be exchanged for an expanded support body 20a, or it is also possible that no support body 20 has originally been vulcanized into the recess 19. Then either an existing bore can be widened by introducing a support body 20a with an oversize, or a bore of, for example, 2 mm to 3 mm diameter is first made and an oversize support body 20a of, for example, 10 mm to 12 mm is inserted into the recess , Because in this method there is no need to push out the earlier supporting body 20, which has a smaller diameter, such a widening of the polymer layer 17 can take place without removing the respective piston 3,103,203,303,403.
• Supporting bodies with threads can also consist of different materials and can be curved if necessary.
• the support body does not have to have the circular cross-sectional shape shown in FIG. 4c, but can also have an oval, elliptical or other shaped peripheral shape, for example, in adaptation to the thinned area. It is also possible to provide several recesses 19 next to one another, as a result of which the expanded area is enlarged overall.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Laminated Bodies (AREA)
• Rotary Pumps (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (17)

• 2000
  • 2000-05-18 EP EP00941960A patent/EP1282777B1/fr not_active Expired - Lifetime
  • 2000-05-18 JP JP2003501000A patent/JP2004527689A/ja active Pending
  • 2000-05-18 DE DE50014574T patent/DE50014574D1/de not_active Expired - Lifetime
  • 2000-05-18 WO PCT/EP2000/004519 patent/WO2001088377A1/fr not_active Ceased
  • 2000-05-18 AT AT00941960T patent/ATE370329T1/de not_active IP Right Cessation
  • 2000-05-18 US US10/181,161 patent/US6827565B1/en not_active Expired - Lifetime

Non-Patent Citations (1)

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