EP2304247A1 - Chambre d'accumulation et procede de realisation - Google Patents

Chambre d'accumulation et procede de realisation

Info

Publication number
EP2304247A1
EP2304247A1 EP09761361A EP09761361A EP2304247A1 EP 2304247 A1 EP2304247 A1 EP 2304247A1 EP 09761361 A EP09761361 A EP 09761361A EP 09761361 A EP09761361 A EP 09761361A EP 2304247 A1 EP2304247 A1 EP 2304247A1
Authority
EP
European Patent Office
Prior art keywords
groove
cutter
collecting space
circumferential direction
axis
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Withdrawn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
EP09761361A
Other languages
German (de)
English (en)
Inventor
Heinrich Albrecht
Michael Jeske
Werner Jonen
Daniel Wentzel
Jan Weule
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.)
Siemens AG
Original Assignee
Siemens 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
Priority claimed from DE102008025249A external-priority patent/DE102008025249A1/de
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP09761361A priority Critical patent/EP2304247A1/fr
Publication of EP2304247A1 publication Critical patent/EP2304247A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps

Definitions

  • the invention relates to a circumferentially alsweitender collecting chamber of a turbomachine which extends over at least a portion of the circumference of a machine axis, which collecting space is formed from at least one outer shell part and a contour insert, which contour insert one of the full milled in the circumferential direction extending at least laterally laterally limited groove having a groove bottom, which collecting space has a circumferentially extending first flow opening, which is formed substantially for axial flows, and at least one second flow opening, which is formed substantially for radial flows, wherein the groove has a first end in the circumferential direction and a second end in the circumferential direction, wherein the second end of the collecting space in the circumferential direction opens into the second flow opening.
  • Peripheral spaces of the above type are usually provided in turbomachines, such as turbines, expander or compressors in the region of the inflow or outflow. While the area of the rotating Strömungsleitkonturen, for example, the blades or the impeller are largely optimized in terms of flow, disproportionately high flow losses often take place in the surrounding areas. To counter this, the usually required 90 ° deflection in the region of an inflow or outflow was no longer designed as a simple radial inflow into an annular space, but as a preferably tangential inflow to a circumferentially tapered plenum, which also as spiral inflow or Spiral outflow is called formed.
  • This collecting space generally has an axially extending first flow opening in the circumferential direction and a second flow opening, which is designed for radial flows.
  • the compressed gas passes, for example, from the impeller into a radially oriented annular space and then into the collecting space regularly after a 90 ° deflection.
  • this collecting space is designed with a cross-section widening along the circumferential direction such that the cross-sectional maximum is in the region of a radial outflow or the second flow opening, where finally the entire outflowing or inflowing fluid collects to flow through.
  • this second flow opening is adjoined by a diffuser, which supplies the process gas, for example in the case of the compressor, to a further compressor stage, an intermediate cooling or another process.
  • DE 3040747 A1 shows a collecting chamber made of hard white cast iron of a round cross section, which widens in the circumferential direction.
  • the molded component is very expensive and creates a costly and unfavorable dependency of the machine manufacturer on the casting supplier.
  • the object of the invention to provide a plenum, which has in particular in the region of the second flow opening only low flow losses and yet is not cast construction.
  • the object is achieved by a collecting space with those listed in claim 1 features.
  • the invention solves the problem with the method for producing a groove in a contour insert according to claim 7.
  • the respective dependent claims contain advantageous developments of the invention.
  • the curved contour of the edge closing the groove in the circumferential direction provides in the case of the outflow for a more advantageous flow distribution and deflection of the moving in the circumferential direction fluid from the plenum in a radial flow direction, for example, a subsequent pipe. This applies to the case of the influx mutatis mutandis.
  • the edge may be bent so that it attaches to a flow contour of a subsequent component, such as a pipe, largely seamless.
  • a radial projection of the edge is round.
  • edge is concave.
  • Low flow losses in particular as a function of the subsequent flow-guiding component, can also provide an elliptical contour of the edge or it can be advantageous if at least one projection of the edge is of elliptical contour.
  • a projection of the edge that is tangential to the groove base may be round, elliptical or round in order to minimize the flow losses.
  • Particularly expedient for minimizing the flow losses is a bend of the edge, in particular in the region of the center of the groove.
  • the flow profile can be designed if at least one axial boundary contour of the groove forming the collecting space or a circumferentially extending edge of the groove is formed as a helix.
  • the axial extent of the groove can be used as a means for widening in the circumferential direction, so that despite an increasing volume flow, at least no increase in the velocity in the collecting space for outflow at a compressor or vice versa in a turbine or an expander.
  • a helix can also be used to form the groove over more than 360 ° of the circumference and in this way the radial outflow (in a compressor) or inflow of the flow influences To separate the first flow opening by this area is arranged axially adjacent to the narrowest region of the plenum, so considered in the initial direction overlaps with this.
  • the design can be superimposed as a helix and the design as a spiral to a spiral helix, so that the advantages of both training can be used.
  • a collecting chamber of the type according to the invention is produced by the method according to the invention, in which with the reaching of that end of the groove, which has a larger cross-section with respect to the other, a milling cutter axis about which the milling cutter rotates, moves from a more radial position to a more tangential position becomes.
  • the rotating circumference of the cutter works with a natural circular shape in such a way in the solid material of the contour insert, so that the desired curved edge of the boundary of the groove is achieved in Ümfangsraum.
  • Excellent results have been achieved in terms of minimizing the flow loss when the router is led out with the reaching of the second end of the groove with a tangential to the local groove base oriented cutter axis from the contour insert.
  • an advantageous development of the invention also provides that there is no direct connection between the incipient collecting space and the outlet from the collecting space into a subsequent discharge nozzle.
  • This in conventional configurations of the plenum usual connection, provides for asymmetries in the pressure curve, which cause forces on the impeller outlet and in this way the rotor shaft in the form of radial forces load, so that the shaft bearing radial bearings are charged higher.
  • Such a design of the outlet from the plenum in the radial direction in the discharge nozzle is particularly space-saving in the circumferential direction of the plenum, so that a slope of the helix of the plenum can turn out lower and thus also a smaller axial space requirement arises.
  • resulting from the radial outlet or the radial outlet of the pressure nozzle from a surrounding housing further advantages, especially in terms of strength and material requirements.
  • increasing the effective cutter diameter is desirable in that the cutter is guided on a path around a central axis that is parallel to the cutter axis during pivoting from the radial orientation to the more tangent orientation runs around a radius of eccentricity. This can be done such that the cutter axis describes a cylinder with one revolution of the circular motion. This cylinder can be a straight cylinder. The most fluid transitions are established as the radius of excentricity increases as the approach to the second end advances. In this case, a continuous increase can take place, e.g. monotonically increasing depending on the swivel angle or other parameter representing the approach to the second end.
  • FIG. 1 shows a longitudinal section through a part of a single-stage compressor with a collecting space according to the invention
  • FIG. 2 shows a contour insert according to the invention in a side view
  • 3 shows a contour insert according to the invention in one
  • FIG. 4 shows a perspective view of a contour insert according to the invention
  • Figure 5 is an end view of the contour insert according to the invention and the orientation of a
  • Figure 6 is a perspective view of a contour insert according to the invention, in which the
  • Collecting space has a radial outlet
  • Figure 7 is a sectional view according to section VII of Figure 6 a detail of the contour insert in the region of the radial outlet.
  • FIG. 1 shows a longitudinal section through part of a compressor 1 with a collecting space 2 according to the invention, which extends in the circumferential direction about a machine axis 3.
  • the compressor 1 has a rotor 4, at one end of which an impeller 5 (compressor stage of a centrifugal compressor) is mounted, which forms a free end of the shaft of the rotor 4.
  • the impeller 5 is flowed axially by an inflow 6 from a fluid 7 and conveys the compressed fluid radially outward into an annular space 8. After a further 90 ° deflection 9, the fluid 7 flows from the annular space 8 into the collecting space 2, collects there and occurs in a manner not shown separately in a continuing diffuser 10 (in the circumferential direction shows darg Hor).
  • the collecting space 2 is formed by means of an outer shell part 21 and a contour insert 22.
  • the recess in the Shell part 21, in which the contour insert 22 is used, is a cylindrical bore.
  • the contour insert 22 is fitted into the shell part 21 in such a way that an enclosed space which forms the annular space 8 remains axially on the end face of the contour insert 22.
  • the variant of the contour insert 22 shown in Figure 1 differs from that shown in Figure 2 to 5 in that it is not made in one piece, but the front end a diffuser disc 11 is provided, which is secured by means of dowel screws on the contour insert 22.
  • the contour insert 22 shown in Figure 2 is cylindrical in the base body 23, wherein a shoulder 24 with a recess 25 on the shell part 21 corresponds such that an axial abutment provides for an exact axial alignment to include a space for the annulus 8.
  • the contour insert 22 is provided with a circumferential groove 26.
  • a groove base 27, which bounds the groove 26 radially inward, is in an end view, so viewed in the direction of the machine axis, spirally formed so that the groove 26 in depth starting from a first end 28 to a second end 29 in Extended cross-section.
  • the Sammelra ⁇ m 2 has a circumferentially extending first flow opening 30 into which the fluid 7 flows substantially axially after the 90 ° deflection 9.
  • a second flow opening 31 for a radial flow direction is the confluence with the diffuser 10.
  • the second flow opening 31 is located at the second end 29 of the collecting space 2 or the groove 26.
  • the groove 26 is, as clearly visible in FIGS. 3 and 4, delimited at the second end 29 by a curved edge 33 in the circumferential direction. In a radial projection, the curved edge 33 has a round shape.
  • the groove 26 and the groove bottom 27 has a first peripheral portion 61 which includes the first end of the groove 26 and has an adjacent second peripheral portion which includes the second end of the groove 26, which groove bottom 27 approaching to the second flow opening 31 has an increase in a concave in the axial direction curvature.
  • FIG. 5 also shows how according to the invention
  • the bent edge 33 is generated by means of a milling cutter 35 rotating around a cutter axis 35.
  • the milling cutter 36 dips into the contour insert 22 with cutter axis 35 aligned radially with respect to the machine axis 3 (eg milling cutter position 40).
  • the cutter 36 remains in the radial orientation of the cutter axis 35, up to a certain circumferential position in the vicinity of the second end 29 of the groove 26.
  • Figure 6 shows a particularly advantageous embodiment of the contour insert 22 in perspective, the second end 29 of the plenum 2 - in a compressor 1 so an outlet 50 from the plenum 2 - is formed in the radial direction to the machine axis 3.
  • the collecting space 2 extending upstream of the outlet 50 describes with respect to its radially inwardly pointing
  • Boundary contour a 90 ° turn beginning upstream in the circumferential direction and ending downstream in the radial direction.
  • the deflection describes here, at least in a section axially in the middle of the collecting space 2, as shown in Figure 7, essentially a shape with a constant radius, ie a circular segment shape.
  • FIG. 7 shows an outlet connection 51 of a housing 52, through which exit connection 51 a process fluid emerges from the collecting space 2 after deflection from the circumferential direction in the radial direction.

Abstract

La présente invention concerne une chambre d'accumulation (2) d'une turbomachine (compresseur 1), qui s'évase en direction périphérique, comprenant au moins une partie enveloppe extérieure (21) et un élément d'insertion profilé (22), l'élément d'insertion profilé (22) présentant une rainure (26) périphérique qui a de préférence la forme d'une spirale hélicoïdale. L'élément d'insertion profilé (22) est selon l'invention fraisé dans la masse et délimité à une extrémité en direction périphérique par une arête incurvée (33) de sorte que les pertes hydrauliques sont minimisées lors de la transition de la chambre d'accumulation à un diffuseur (10) situé en aval.
EP09761361A 2008-05-27 2009-05-08 Chambre d'accumulation et procede de realisation Withdrawn EP2304247A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09761361A EP2304247A1 (fr) 2008-05-27 2009-05-08 Chambre d'accumulation et procede de realisation

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102008025249A DE102008025249A1 (de) 2008-05-27 2008-05-27 Sammelraum und Verfahren zur Fertigung
PCT/EP2009/054869 WO2009144102A1 (fr) 2008-05-27 2009-04-23 Espace collecteur et procédé de fabrication
PCT/EP2009/003299 WO2009149798A1 (fr) 2008-05-27 2009-05-08 Chambre d'accumulation et procédé de réalisation
EP09761361A EP2304247A1 (fr) 2008-05-27 2009-05-08 Chambre d'accumulation et procede de realisation

Publications (1)

Publication Number Publication Date
EP2304247A1 true EP2304247A1 (fr) 2011-04-06

Family

ID=43629660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09761361A Withdrawn EP2304247A1 (fr) 2008-05-27 2009-05-08 Chambre d'accumulation et procede de realisation

Country Status (1)

Country Link
EP (1) EP2304247A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040747A1 (de) * 1979-10-29 1981-05-07 Rockwell International Corp., 90245 El Segundo, Calif. Zentrifugalpumpe und turbine fuer hohen druck und hohe temperatur
EP2183487A1 (fr) * 2007-09-07 2010-05-12 Man Turbo Ag Turbomachine et procédé de production d'une turbomachine de ce type

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040747A1 (de) * 1979-10-29 1981-05-07 Rockwell International Corp., 90245 El Segundo, Calif. Zentrifugalpumpe und turbine fuer hohen druck und hohe temperatur
EP2183487A1 (fr) * 2007-09-07 2010-05-12 Man Turbo Ag Turbomachine et procédé de production d'une turbomachine de ce type

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009149798A1 *

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