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
  • F01C21/08—Rotary pistons
  • F01C21/0809—Construction of vanes or vane holders
• • 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
  • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
  • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings
• • 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
  • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
  • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
  • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
  • F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
• • 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
  • F04C2230/90—Improving properties of machine parts
  • F04C2230/92—Surface treatment

Definitions

• the invention relates to a vane cell pump with a rotor which has radially movable vanes which are guided in slots, the vanes being movable along the inner contour of a contour ring arranged in a pump housing, the contour ring having a stroke contour for the vanes and with the vanes forms at least one suction and pressure chamber when the rotor rotates.
• Vane pumps of the type mentioned are known. When the rotor rotates, the vanes are guided along the ring contour by the centrifugal force that occurs and additionally by a pressure directed under the vanes and originating from the medium being conveyed. This leads to the well-known function of aspirating and ejecting any medium.
• the inner contour of the contour ring for the pump chambers has at least one suction area and at least one pressure area, which are each separated from one another by at least one separating area.
• the wing heads have a curved surface in the direction of rotation, this surface running along the inner contour of the contour ring, which thus forms the sliding surface for the wing heads.
• both the wing heads and the contour raceway are exposed to high frictional loads.
• the centrifugal forces acting on the wing and especially the pressure forces directed under the wing ensure high contact forces of the wing head against the ring contour, so that the load on the sliding pair of wing head / contour increases with increasing speed and pressure.
• the rings and the vanes show considerable wear. This means that with the known surfaces and the manufacturing and grinding processes used for the wings, wing heads and raceways of the contour ring, you cannot go beyond a certain pressure load limit.
• the object of the invention is therefore to improve the surfaces of the wing heads and / or the inner contour of the contour ring so that the wear remains uncritical or is significantly reduced even when the pressure is increased.
• a vane cell pump is proposed, the sliding surfaces of the wing and / or the contour ring are machined in such a way that an improvement in the known load share by more than three times is achieved.
• the treads of the wing heads and / or the treads of the contour rings are first provided with a finely ground surface with a roughness depth ⁇ 3 ⁇ m and then z. B. finished with a flow polishing process or sliding polishing process to a defined proportion of material. This results in an increase in the percentage of "load-bearing" material on the surfaces and an all-round smoothing and deburring of the profile tips.
• CBN crystalline boronitride ground blades are preferably used for use in the flow polishing device or slide polishing device.
• a vane cell pump with a rotor has slots which are guided by radially movable vanes and can be moved along the inner contour of a contour ring arranged in a pump housing, the contour ring having a stroke contour for the vanes and forming pump spaces with the vanes that at least represent a suction and at least one pressure chamber, the wing heads sliding along a path on the inside of the contour ring, at least a region of the wing heads and / or the contour ring which is in sliding contact with the other sliding partner or the respective running surface for the Along the rotation of the rotor with the blades and has a finely machined surface, this
• At least the area of the wing heads and / or the contour ring, which is in sliding contact with the respective other sliding partner, or who in each case forms the tread when sliding along when the rotor rotates, has a finely machined surface, this surface roughness essentially transverse to the aforementioned surface quality of Ra z ⁇ 0.15 ⁇ m and material proportions Rk z ⁇ 0.25 ⁇ m, Rpk z ⁇ 0.15 ⁇ m and Rvk z ⁇ 0.25 ⁇ m with engagement limits Mr1 ⁇ 15% and Mr2> 85%.
• the surface is achieved by flow grinding or flow polishing or surface grinding or surface polishing.
• the surface can be achieved by honing or finishing, such as brushing or felting.
• An embodiment is also preferred in which the surface is obtained by cold forming processes, such as drawing or rolling, or other processes.
• the surface is first pre-machined to a roughness R z ⁇ m 3.0 ⁇ m, as ground, and then to a roughness, possibly essentially in one direction, as previously described, and / or transverse to this direction, as previously described, edited.
• the method of producing a finely ground surface is combined with the previously described, final machining method to produce the surface.
• CBN crystalline bomitride ground blades are used for the abovementioned final processes.
• Wings with shaped ground treads are preferably used for the final methods mentioned.
• the blades and / or contour rings to be machined are arranged in packets in a flow grinding device.
• a plastic mass with an abrasive addition of abrasive is preferably pressed back and forth in the device over the surfaces to be machined.
• the pressure and the flow movement of the plastic mass produce the surface smoothing of the surface to be processed.
• a vane cell pump is preferred in which the blades and / or contour rings to be machined are finish-ground to the above-mentioned surface qualities in a vibratory grinding device (trowal system), a grinding paste being used in addition to the sliding bodies (trowal bodies, trowal stones).
• a vane cell pump is also preferred in which the sliding bodies have the shape of obliquely cut-off cylinder bodies.
• a vane cell pump is preferred, in which the sliding body essentially as
• Spacers serve between the parts to be ground and the grinding process itself is essentially realized by the grinding paste.
• the invention also relates to a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps, at least the area of the wing heads and / or the contour ring that is in sliding contact with the other sliding partner or that Tread forms when sliding along with rotation of the rotor with the blades, has a finely machined surface, this surface roughness, possibly essentially in one direction, of Ra y ⁇ 0.07 microns and Material proportions Rk y ⁇ 0.12 ⁇ m, Rpk y ⁇ 0.1 ⁇ m and Rvk y ⁇ 0.15 ⁇ m with intervention limits MV1 ⁇ 10% and Mr2> 90%.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps in which at least the area of the wing heads and / or the contour ring that is in sliding contact with the other sliding partner or that respectively Tread forms when sliding along with rotation of the rotor with the blades, has a finely machined surface, this surface roughness essentially transverse to the aforementioned surface quality of Ra z ⁇ 0.15 ⁇ m and material components Rk z ⁇ 0.25 ⁇ m, Rpk z ⁇ 0, 15 ⁇ m and Rvk z ⁇ 0.25 ⁇ m with control limits Mr1 ⁇ 15% and Mr2 85%.
• a method according to the invention for producing and / or improving the surface of the slideways of wing heads and / or contoured rings of vane pumps achieves the surface by flow grinding or flow polishing or surface grinding or slide polishing.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps is further preferred, in which the surface is achieved by honing or finishing, such as brushing or felting.
• Another method according to the invention for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps achieves the surface by cold forming methods, such as drawing or rolling, or other methods.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps is preferred, in which the surface is first pre-machined, such as ground, to a roughness Rz ⁇ 3.0 ⁇ m and subsequently processed for roughness along and / or transversely to the machining direction according to the previously described methods.
• the invention further relates to a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps, in which the method of producing a finely ground surface (Rz ⁇ 3.0 ⁇ m) with the previously mentioned, for producing the surface Procedure is combined.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of vane pumps is also preferred, in which CBN (crystalline bomitride) ground blades are used for the aforementioned final methods.
• CBN crystalline bomitride
• a method according to the invention for producing and / or improving the surface of the slideways of wing heads and / or contour rings of flight egg pumps uses vanes with shaped ground treads for the aforementioned, final method.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of flight egg cell pumps is preferred, in which the wings and / or contour rings to be machined are arranged in packets in a flow grinding device.
• a plastic mass with an abrasive addition of abrasive is pressed back and forth in the device over the surfaces to be processed.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of flight egg pumps which produces the surface smoothing of the surface to be machined during flow grinding or polishing by the pressure and the flow movement of the plastic mass.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of flight egg pumps is preferred, in which the sliders have the shape of obliquely cut cylindrical bodies.
• a method for producing and / or improving the surface of the slideways of wing heads and / or contour rings of flight egg pumps is preferred, in which the sliders essentially serve as spacers between the parts to be ground and the grinding process itself is essentially carried out by the grinding paste.
• Figure 1 is a side view of the contour ring, rotor and blades
• Figure 2 shows a wing in side view
• Figure 3 shows a wing in front view
• Figure 4 shows a flow polishing device
• Figure 5 shows a slide grinding body
• Figure 6 is a graphic representation of the material proportions
• FIG. 1 shows the inner parts of a vane cell rotation group, consisting of the contour ring 1, the vanes 2 and the rotor 3.
• the vanes 2 are guided in corresponding slots 4 in the rotor 3 and slide with their vane heads 6 along the inner contour 7 of the contour ring 1.
• the vanes 2 are pressed by the centrifugal force which occurs and additionally by a pressure which is conducted under the vanes 2 and originates from the medium being conveyed and is guided along the ring contour 7.
• the wing heads 6 have curved surfaces in the direction of rotation, these surfaces running along the inner contour 7 of the contour ring 1, which thus forms the sliding surface for the wing heads 6.
• the centrifugal forces acting on the wing 2 and especially the pressure forces guided under the wing 2 into the lower wing regions 5 ensure high contact forces of the wing head 6 on the ring contour 7, so that the force load on the slideway of the wing head and contour increases with increasing speed and with increasing pressure increases.
• the guided in the slots 4, radially movable vanes 2 together with the contour ring 1 and the stroke contour 7 when moving out and in the slots 4 each form two pump rooms between the two wings, the corresponding suction and pressure spaces as well as separation spaces between suction and Represent pressure rooms.
• the rotor 3 is set in rotation in its center 8 by a shaft (not shown here) with corresponding toothing.
• the contour ring 1 is centered and fixed by means of bores 10, not shown here, by means of the bores 10 relative to the bearing housing of the wing cell pump.
• the contour ring 1 contains corresponding openings 9, which can pass both pressure-side fluid and suction-side fluid from one side of the ring to the other side of the ring, so that both the vane cell pump can be filled from both sides, so that it can also be pressurized on both sides can discharge ejected medium.
• Figure 2 shows a side view of a wing 2, which is shown in cross section as a thin, essentially rectangular leaflet with a rounded wing head 6.
• the right side surface 11, as well as the left side surface 12, which slide in the rotor slot, are ground in a grinding process in order to obtain a corresponding sliding surface for sliding in the rotor slot.
• the lower surface 13 is not subjected to any sliding movement against another component and therefore does not require any special surface treatment; only the pressure fed under the wing acts on the surface 13, which presses the wing with its wing head 6 against the stroke contour shown in FIG. Since the wing head 6 is pressed against this stroke contour with high force, the friction load and thus the wear load of this surface on the wing is greatest.
• the wing is shown in a front view, the wing 2 in turn with the wing underside 13, on which the under wing pressure acts, and with the wing top 6 with the rounded wing head, which also maintains a straight running edge over the entire width and on this Width with its leading edge must have a good "load-bearing" surface material content in order to interact with the stroke contour only a small one
• FIG. 4 schematically shows the structure of a flow polishing device 20 for the blades.
• the wings are shown enlarged again in detail X. It can be seen that the wings in several packages, such as package 21 or package 22, are placed one behind the other in the device 20 shown here in box form.
• the wing heads 23 of these packets come to lie approximately in the middle of a rectangular cavity 24 of the device.
• the device can also have other shapes, it is only important that the
• Abrasive material can be moved in the longitudinal direction of the wing heads. If in now In the direction of arrow 25 through the cavity containing the wing heads a special plastic mass is pressed back and forth, which is provided with appropriate abrasives, the surface of the wing heads 23 is produced by the combination of the pressure of this plastic mass and the flowing movement of this plastic mass.
• the advantage of this flow polishing by means of this plastic mass can also be seen in the fact that the material particles removed by the wing heads are absorbed by the plastic mass and thus removed from the wings, so that they no longer negatively affect the fine smoothing of the surface that has already taken place, like an additional abrasive-like material can influence.
• this plastic grinding process also known as flow polishing, achieves a particularly fine and smooth surface, which enables more than three times the "load-bearing" material content than known ground wing head surfaces.
• this grinding process it was possible for the first time to use the pumps with to develop these wing heads and / or with contour running surfaces of the contour rings ground using the same method to a pressure resistance of 180 bar.
• FIG. 5 A slide grinding body used for this method is shown in FIG. 5.
• the cylindrical body 30 with a central axis 33 is cut obliquely at both ends, so that elliptical end surfaces 31 result.
• Figure 5.1 shows a perspective view
• Figure 5.2 shows a cross section through the slide grinding body.
• FIG. 6 shows a graphic representation of material proportions corresponding to machined surfaces in accordance with DIN-EN-ISO 13565-2 from April 1998.
• This part of ISO 13565 defines a set of parameters that are based on the linear representation of the material proportion curve and that are used for the evaluation of the roughness profile defined in ISO 13565-1 with grooving suppression. It is based on a surface model in three height layers, with the peaks, the core area and the valleys being evaluated separately.
• Roughness core profile roughness profile without outstanding peaks and deep valleys
• Material fraction Mr1 Material fraction, in percent, determined by the cutting line that separates the outstanding peaks from the roughness core profile
• Material fraction Mr2 Material fraction, in percent, determined by the cutting line that separates the deep valleys from the roughness core profile
• Reduced peak height Rpk Average height of the outstanding Peaks above the roughness core profile
• Reduced groove depth Rvk Average depth of the troughs below the
• the core sizes shown in FIG. 6 can be used to define the surfaces according to the invention which can be produced by the methods according to the invention.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Rotary Pumps (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7639006

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (5)

Citations (4)

• 2001
  • 2001-04-11 WO PCT/DE2001/001439 patent/WO2001079659A1/de active Application Filing
  • 2001-04-11 DE DE10191459T patent/DE10191459D2/de not_active Ceased
  • 2001-04-11 DE DE10118103A patent/DE10118103A1/de not_active Withdrawn
  • 2001-04-11 AU AU2001258215A patent/AU2001258215A1/en not_active Abandoned
  • 2001-04-13 FR FR0105116A patent/FR2807792B1/fr not_active Expired - Fee Related
  • 2001-04-13 IT IT2001MI000815A patent/ITMI20010815A1/it unknown

Patent Citations (4)

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