EP4025770A1 - Method for selecting a radial profile of a cavity to be produced in a rear side of an impeller - Google Patents
Method for selecting a radial profile of a cavity to be produced in a rear side of an impellerInfo
- Publication number
- EP4025770A1 EP4025770A1 EP20765286.8A EP20765286A EP4025770A1 EP 4025770 A1 EP4025770 A1 EP 4025770A1 EP 20765286 A EP20765286 A EP 20765286A EP 4025770 A1 EP4025770 A1 EP 4025770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- value
- paddle wheel
- radial profile
- rear face
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010187 selection method Methods 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims description 15
- 238000003860 storage Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/027—Arrangements for balancing
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/662—Balancing of rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/40—Application in turbochargers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/15—Load balancing
Definitions
- the present invention relates to the technical field of balancing a paddle wheel by removing material. It relates more particularly to a method for selecting a radial profile of a cavity, to be produced in a rear face of a paddle wheel in order to modify the value of its unbalance.
- a turbocharger makes it possible to increase the efficiency of a heat engine.
- a turbocharger includes a turbine wheel, held at one end of a mechanical shaft, and a compressor wheel held at another end of said shaft.
- the turbine wheel is placed in the flow of exhaust gases from the engine to cause the compressor wheel to rotate through the mechanical shaft.
- the compressor wheel is placed in the engine's intake duct to compress the intake gases before they are injected into the engine.
- the rotational speed of the turbocharger can then reach very high speeds, of the order of 250,000 revolutions per minute. Therefore, a poor balance between the mechanical shaft and the turbine wheel can generate vibrations, which can cause noise nuisance in the form of hissing as well as premature wear of the turbocharger.
- turbine wheels are paddle wheels produced by a foundry.
- the rough surface of the paddle wheels does not favor its precise centering on the mechanical shaft when welding.
- the distribution of the filler metal is also not precisely controlled during their welding.
- the axis of rotation of the mechanical shaft is thus more or less offset from the center of inertia of the welded part.
- the current selection methods implement a step of modeling a radial profile of a cavity, located in the specific zone imposed by the manufacturer.
- the radial profile of the cavity is positioned so that the bottom of the cavity is level with the maximum depth of the specific area.
- the value of the surface of the radial profile of the cavity is subsequently compared with a reference value. If the difference is too large between these two values, the selection process changes the shape of the radial profile.
- the selection method wishes to increase the value of the surface of the radial profile, in order to tend towards the set value, the radial profile can only be enlarged in one direction, parallel to the rear face of the paddle wheel.
- the current methods of selecting the radial profile of a cavity favor profiles of cavities whose bottom is positioned at the level of the maximum depth of the specific zone.
- the radial profiles of the cavities offered are therefore often narrow and their construction difficult.
- the radial profiles of deep and narrow cavities significantly weaken the mechanical structure of the paddle wheels, compared to a wider and shallower radial profile.
- the invention aims to remedy the technical problems mentioned above, by proposing a method of selecting the radial profile of a cavity, to be provided in a specific zone of withdrawal of a paddle wheel, offering a greater variety of profile shapes in order to facilitate their implementation and better preserve the mechanical properties of a paddle wheel.
- the invention proposes a method for selecting a radial profile of a cavity to be formed in a rear face of a paddle wheel, in order to modify the value of its unbalance, the radial profile of the cavity comprising a first portion extending between a distal edge and a bottom of the cavity, and a second portion extending between the bottom and a proximal edge of the cavity, the cavity to be included in a specific area extending between a minimum radius and a maximum radius at the rear face of the paddle wheel, the depth of the specific area measured from the rear face of the paddle wheel being limited to a maximum depth.
- the invention is characterized in that the selection method implements the following steps a) positioning a radial profile of the cavity in the specific area; then b) calculating the value of the area of the radial profile of the cavity; then c) comparison of the calculated area value with a predefined setpoint value when the calculated area value is less than the setpoint value, the radial profile of the cavity is enlarged
- step b) In a direction normal or substantially normal to the rear face of the paddle wheel, when the bottom of the cavity is located at a depth greater than the intermediate depth; then d) the process reproduces step b).
- the invention thus proposes a new method for selecting the radial profile of a cavity to be formed in a rear face of a paddle wheel, allowing to enlarge the radial profile in two different directions, in a radial direction when the bottom of the cavity is located at an intermediate depth, or in a direction normal or substantially normal to the rear face of the paddle wheel when the bottom of the cavity is located at a depth greater than the intermediate depth.
- the selection method according to the invention thus promotes the widest possible radial occupation of the cavity, in a specific zone, before having to increase the depth of the cavity in order to increase the quantity of material withdrawn from the paddle wheel.
- the selection method according to the invention favors a radial cavity profile that is wider than it is deep, when the specific zone allows it. This advantageously makes it possible to better preserve the mechanical strength of the paddle wheel.
- the value of the intermediate depth is between 20% and 80% of the value of the maximum depth of the specific zone, preferably between 50% and 60%.
- the maximum depth of the specific zone is between 0.2 mm and 1.5 mm, preferably between 0.5 mm and 1 mm.
- the proximal edge and the distal edge of the cavity are respectfully located at the level of the minimum radius and at the level of the maximum radius of the specific area.
- the radial profile of the cavity is enlarged by inserting at least one intermediate portion between the bottom and the second portion of the profile of the cavity.
- at least one intermediate portion is rectilinear in shape.
- at least one intermediate portion is inclined relative to the rear face of the paddle wheel, the angle of inclination of the intermediate portion being between -12 ° and + 12 °, preferably between -6 ° and + 6 °.
- at least two intermediate portions are aligned.
- the radial profile of the cavity is enlarged in a direction normal or substantially normal to the rear face of the paddle wheel.
- the radial profile of the cavity is enlarged by translating the intermediate portion or portions of the radial profile of the cavity, between the first portion and the second portion of the radial profile of the cavity.
- the portion or the intermediate portions are translated in a direction normal to the rear face of the paddle wheel.
- the length of at least one intermediate portion is reduced when the intermediate portion or portions are translated in a direction normal to the rear face of the paddle wheel.
- the radial profile of the cavity is enlarged when the value of the calculated area is less than 95% of the set value, preferably less to 99% of the set value.
- the radial profile of the cavity is validated if the value of its surface is within a tolerance range of the set value, or the radial profile of the cavity is translated into direction of the rear face of the paddle wheel so as to reduce the value of its surface, when the latter is greater than the set value.
- the radial profile of the cavity is translated in the direction of the rear face of the paddle wheel so as to reduce the value of its surface, when the latter is greater than the set value, by preferably greater than 101% of the set value.
- the invention also relates to a method of selecting the profile of a cavity to be produced in a rear face of a paddle wheel, in order to modify the value of its unbalance, implementing at least one method of selecting the radial profile of a cavity as described above.
- the invention also relates to a device for balancing a paddle wheel, comprising means for storing a method for selecting the profile of a cavity described above, means for removing material at the level. of a rear face of a paddle wheel, a control unit capable of implementing the stored selection method, then producing in a rear face of a paddle wheel a cavity conforming to the profile determined by the selection method memorized.
- FIG. 1 represents a schematic and partial view of a radial section of a paddle wheel, illustrating the positioning of a specific material removal zone at the level of a rear face of the paddle wheel, including the positioning and dimensions are imposed by the manufacturer of the paddle wheel;
- FIG. 2 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising an example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 3 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising another example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 4 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising another example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 5 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising another example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 6 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising another example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 7 represents a schematic and partial view of the paddle wheel illustrated by FIG. 1, comprising another example of a cavity formed in the specific zone, with the aim of balancing the unbalance of the paddle wheel, the radial profile of which has been validated by the selection method according to the invention;
- FIG. 8 shows a schematic view of a balancing device for a paddle wheel, capable of implementing a method for selecting the radial profile of a cavity according to the invention, to be provided in a rear face of a paddle wheel to balance it.
- Figure 1 illustrates a radial section of a specific area 2, present at a rear face 4 of a paddle wheel 6.
- the rear face 4 is substantially normal to an axis of pivot 8 passing through the center of the paddle wheel.
- the paddle wheel comprises fins 10 which are located on a face opposite to the rear face.
- the radial profile of the specific zone 2 is rectangular in shape.
- the specific zone 2 is characterized by a maximum depth Pmax and a radial width.
- the radial width is delimited by minimum radius Rmin and a maximum radius Rmax.
- the radii are measured relative to the center of the face rear 4 of the paddle wheel.
- the value of the maximum depth Pmax is between 0.2 mm and 1.5 mm, preferably between 0.5 mm and 1 mm.
- the value of the minimum radius Rmin, relative to the smallest outer radius of the rear face 4 is from 20% to 60%, preferably from 40% to 50%.
- the value of the maximum radius Rmax, relative to the smallest outer radius of the rear face 4 is between 50% and 100%, preferably 60% and 90%.
- the invention provides a method of selecting a radial profile of a cavity to be produced in the specific zone 2, making it possible to optimize the amount of material removed for a given depth in the specific zone.
- the invention proposes a method favoring the production of a cavity whose depth is less than the maximum depth of the specific zone 2, in order to best preserve the mechanical structure of the paddle wheel.
- the selection method according to the invention implements a first step, consisting in placing a radial profile of a cavity in the specific zone 2 as illustrated in FIG. 2.
- the radial profile of the cavity. cavity is constrained by the tool used to perform the material removal.
- FIG. 2 illustrates an example of the radial profile of a cavity 14, produced in a rear face of a paddle wheel 6, using a grinding disc.
- the radial profile 16 of the cavity consists of a first portion 18, extending between a distal edge 20 of the cavity 14 and a bottom 22 of the cavity, and of a second portion 24 extending between the bottom 22 and a proximal edge 26 of the cavity.
- distal and proximal respectively refer to an area far away and an area close to the center of the impeller.
- distal edge 20 of the cavity is the edge of the cavity closest to the periphery 28 of the rear face of the impeller.
- the radial profile 16 of the cavity is positioned so that the bottom 22 of the cavity is located at an intermediate depth Pint illustrated in FIG. 2.
- the value of the intermediate depth is between 20 % to 80% of the value of the maximum depth Pmax of the specific zone, preferably 50% to 60%.
- the radial profile 16 of the cavity is also placed so that the distal edge 20 of the cavity is located near or at the location of the edge of the specific zone 2 present at the level of the maximum radius Rmax. He It is preferable to position the cavity 14 in this way, in order to preserve the mechanical structure of the wheel.
- the selection method calculates the value of the area Vs of the radial profile of the cavity 14.
- the selection method compares the calculated value of the area Vs, with a predefined setpoint value Vc.
- the setpoint value Vc corresponds to a quantity of material that it is desired to remove in a radial plane of the paddle wheel 6, during a balancing process.
- the selection method implements a fourth step.
- the method implements the fourth step when the value of the calculated area Vs is less than the set value and excluded from a tolerance range limited to a value less than or equal to 95% of the set value, preferably limited to a value less than or equal to 99% of the set value.
- the selection process enlarges the radial profile 16 of the cavity, by moving the proximal edge 26 of the cavity towards the center of the wheel.
- the second portion 24 of the radial profile is translated in the direction of the pivot axis 8 of the paddle wheel.
- the selection method inserts an intermediate portion 30 between the second portion 24 of the radial profile and the bottom 22 of the cavity.
- a new radial profile 16B is thus obtained, illustrated in FIG. 3.
- the selection method again calculates the value of the area Vs of the cavity 14 delimited by the new radial profile 16B, then compares it with the set value Vc. In the case where the value of the surface Vs is within the tolerance range defined above, the selection method validates this new radial profile 16B. Conversely, if the value of the surface Vs is less than the set value and excluded from the tolerance range, the second portion 24 of the radial profile is again translated in the direction of the pivot axis 8 of the wheel with vanes, in order to insert a new intermediate portion 30 between the second portion 24 and the bottom 22. A new radial profile 16C illustrated in FIG. 4 is then obtained.
- the selection method renews the calculation of the area of the radial profile 16C , in order to compare it with the setpoint Vc.
- the steps described above are repeated as many times as necessary, until the value of the surface Vs of the radial profile is included in the tolerance range and that the radial profile of the cavity 14 remains included in the specific zone 2.
- the radial profile is then validated by the selection method.
- the invention therefore proposes a variety of large radial profiles, the depth of which is less than the maximum depth Pmax of the specific zone. In other words, the invention favors the production of cavities whose radial profile is less likely to weaken the mechanical structure of the paddle wheel.
- the invention implements a step consisting in translating the bottom 22 as well as the intermediate portions 30, so as to increase the depth of the cavity 14 and obtain a new radial profile 16E illustrated in Figure 6.
- the positions of the proximal and distal edges are not changed or substantially the same, so that the cavity 16 occupies the entire specific area 2 at the rear face 4 of the impeller.
- the radial profile 16D of the cavity is translated in a first direction normal or substantially normal to the rear face 4, so as to increase the depth of the bottom 22 of the cavity from Pint to P1. If necessary, the length of the intermediate portions 30 are reduced so as to allow the tool used to remove material, to work in the specific zone 2, while respecting the limits of the specific zone.
- the method again implements a step of calculating the value of the surface area of the cavity 14, delimited by the new radial profile 16E, then compares this value with the setpoint value Vc. If the new value of the surface of the radial profile 16E is not included in the tolerance range mentioned above, the selection method again translates the bottom 22 as well as the intermediate portions 30, in order to increase the depth of the bottom 22 of the cavity, without modifying the position of the proximal and distal edges. These steps are reproduced until the value of the surface Vs of the profile of the cavity is within the tolerance range, the profile is then validated by the selection process.
- the selection method compares the value of the calculated area Vs, with a setpoint value Vc. If this value Vs is within the tolerance range defined above, the selection method validates the radial profile. The fourth step is then not necessary. In the cases where the value Vs is not included in the tolerance range and greater than the setpoint value, the selection method implements a fourth alternative step, illustrated by FIG. 7, consisting in translating the profile of the cavity 16 towards the rear face 4, so as to reduce the depth of the bottom 22 to a value P2. The selection method again calculates the value of the surface area of the new radial profile 16F and then reproduces the third step described above. These steps are reproduced until the value of the surface Vs of the profile of the cavity is within the tolerance range, the profile is then validated by the selection process.
- a fourth alternative step illustrated by FIG. 7, consisting in translating the profile of the cavity 16 towards the rear face 4, so as to reduce the depth of the bottom 22 to a value P2.
- the selection method again calculates the value of the surface area of the new radi
- the intermediate portions 30 mentioned above, introduced between the bottom 22 and the second portion 24 of the profile of the cavity, are preferably rectilinear and have the same inclination with respect to the rear face 4 of the paddle wheel or to the axis of rotation of said wheel. As illustrated by Figures 3 to 5, each intermediate portion 30 forms an acute angle a with the rear face 4 of the paddle wheel, the value of which is from -12 ° to + 12 °, preferably from - 6 ° to + 6 °.
- the intermediate portions are preferably aligned with one another and their length is from 0.01 mm to 1 mm.
- the first portion 18 of the radial profile of the cavity 14 is concave in shape, and its radius of curvature is between 10 mm and 100 mm, preferably between 20 mm and 80 mm.
- the second portion 24 of the radial profile of the cavity 14 is also concave in shape, and its radius of curvature is between 1 mm and 5 mm, preferably between 2 mm and 4 mm.
- the selection method comprises a step allowing an operator to select at least one of the following values: Rmin, Rmax, Pmax, Pint, the shape of the first portion 18 of the radial profile of the cavity 14 to be produced, the shape of the second portion 24 of the radial profile of said cavity, the length of a rectilinear portion 30 to be introduced between the bottom 22 and the second portion 24, the inclination of a rectilinear portion 30.
- the invention also relates to a balancing device 32 of a paddle wheel, illustrated by FIG. 8, comprising storage means 34 of a method for selecting the profile of a cavity as described below.
- material removal means 36 at the level of a rear face of a paddle wheel, a control unit 38 able to implement the stored selection method and perform in a rear face of a paddle wheel , a cavity whose radial profile conforms to the profile chosen by the stored selection method.
- the storage means 34 comprise at least one electronic storage unit.
- the withdrawal means 36 comprise an articulated arm holding at one of its ends a grinding wheel provided with an abrasion disc.
- the control unit 38 comprises a processor and, optionally, an interface allowing a user to modify at least one of the following values of the selection method described above, depending on the paddle wheel to be balanced: Rmin, Rmax, Pmax, Pint, the shape of the first portion 18 of the radial profile of the cavity 14 to be produced, the shape of the second portion 24 of the radial profile of said cavity, the length of a rectilinear portion 30 to be introduced between the bottom 22 and the second portion 24, the inclination of a rectilinear portion 30.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
- Hydraulic Turbines (AREA)
- Tires In General (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1909808A FR3100562B1 (en) | 2019-09-06 | 2019-09-06 | Method for selecting a radial profile of a cavity to be made in a rear face of a paddle wheel. |
PCT/EP2020/074849 WO2021044022A1 (en) | 2019-09-06 | 2020-09-04 | Method for selecting a radial profile of a cavity to be produced in a rear side of an impeller |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4025770A1 true EP4025770A1 (en) | 2022-07-13 |
Family
ID=68211107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20765286.8A Pending EP4025770A1 (en) | 2019-09-06 | 2020-09-04 | Method for selecting a radial profile of a cavity to be produced in a rear side of an impeller |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4025770A1 (en) |
FR (1) | FR3100562B1 (en) |
WO (1) | WO2021044022A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3086754B1 (en) * | 2018-10-02 | 2021-11-12 | Datatechnic Sas | PROCESS FOR BALANCING THE UNBALANCE OF A SHAFT-WHEEL ASSEMBLY |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002047944A (en) * | 2000-07-31 | 2002-02-15 | Toyota Motor Corp | High speed rotation type impeller |
JP2003302304A (en) * | 2002-04-09 | 2003-10-24 | Mitsubishi Heavy Ind Ltd | Method and apparatus for correcting balance of rotor work, and manufacturing method for rotor work |
JP6025962B2 (en) * | 2013-02-22 | 2016-11-16 | 三菱重工業株式会社 | Turbine rotor and turbocharger incorporating the turbine rotor |
US20160265359A1 (en) * | 2015-03-09 | 2016-09-15 | Caterpillar Inc. | Turbocharger wheel and method of balancing the same |
WO2016182688A1 (en) * | 2015-05-08 | 2016-11-17 | Balance Technology, Inc. | Abrasive water jet balancing appartus and method for rotating components |
-
2019
- 2019-09-06 FR FR1909808A patent/FR3100562B1/en active Active
-
2020
- 2020-09-04 EP EP20765286.8A patent/EP4025770A1/en active Pending
- 2020-09-04 WO PCT/EP2020/074849 patent/WO2021044022A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR3100562B1 (en) | 2023-02-24 |
WO2021044022A1 (en) | 2021-03-11 |
FR3100562A1 (en) | 2021-03-12 |
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