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WO2017159730A1 - Hélice, machine tournante, et procédé de fabrication d'hélice - Google Patents

Hélice, machine tournante, et procédé de fabrication d'hélice Download PDF

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Publication number
WO2017159730A1
WO2017159730A1 PCT/JP2017/010391 JP2017010391W WO2017159730A1 WO 2017159730 A1 WO2017159730 A1 WO 2017159730A1 JP 2017010391 W JP2017010391 W JP 2017010391W WO 2017159730 A1 WO2017159730 A1 WO 2017159730A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
peripheral surface
axial direction
axis
blade
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.)
Ceased
Application number
PCT/JP2017/010391
Other languages
English (en)
Japanese (ja)
Inventor
山下　修一
伸一郎 得山
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.)
Mitsubishi Heavy Industries Ltd
Mitsubishi Heavy Industries Compressor Corp
Original Assignee
Mitsubishi Heavy Industries Ltd
Mitsubishi Heavy Industries Compressor Corp
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 Mitsubishi Heavy Industries Ltd, Mitsubishi Heavy Industries Compressor Corp filed Critical Mitsubishi Heavy Industries Ltd
Priority to US16/083,412 priority Critical patent/US20190078583A1/en
Priority to EP17766726.8A priority patent/EP3415767A4/fr
Publication of WO2017159730A1 publication Critical patent/WO2017159730A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/10—Manufacture by removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/301—Cross-section characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • F05B2250/71—Shape curved
    • F05B2250/711—Shape curved convex
    • 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
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade

Definitions

  • the present invention relates to an impeller, a rotating machine, and a method for manufacturing an impeller.
  • Patent Document 1 describes a centrifugal compressor having a so-called closed impeller in which a cover is integrally attached to a blade.
  • the cover, the blade, and the disk are not formed by the three-piece manufacturing method that is assembled after individually forming the cover, the blade, and the disk, or the cover, the blade, and the disk are formed from the beginning.
  • a one-piece manufacturing method of forming in an integrated state is adopted.
  • the working fluid is a corrosive gas
  • it is difficult to weld a corrosion-resistant material and thus a one-piece manufacturing method is often employed.
  • This one-piece manufacturing method is also adopted when the flow path width becomes extremely narrow, such as a small-diameter impeller, and the leg length of the welded portion becomes too large with respect to the flow path width, and there is a concern about performance reliability.
  • the closed impeller described in Patent Document 1 may require complicated machining, electrical discharge machining, or the like, particularly when trying to make a single piece.
  • this machining since the root of the tool is thick, the depth at which the tool can be inserted in the axial direction of the impeller between the blades is limited. For this reason, when machining the disk side or the cover side of the impeller, the tool is inserted obliquely with respect to the impeller axis line.
  • a cutting tool may interfere with the impeller cover or the like, and there is a problem that skill is required for processing the impeller.
  • electric discharge machining it is necessary to form the discharge electrode in a complicated shape, which may increase the cost.
  • An object of this invention is to provide the impeller which can be processed easily, a rotary machine, and the manufacturing method of an impeller.
  • the impeller includes a disk, a plurality of blades, and a cover.
  • the disc has a disk shape centered on the axis.
  • the plurality of blades are formed on the surface facing the first side in the axial direction of the disk at intervals in the circumferential direction of the axial line.
  • the cover surrounds the plurality of blades from the first side in the axial direction.
  • the cover has an inner peripheral surface and a tip surface.
  • the inner peripheral surface is reduced in diameter toward the first side from the other side in the axial direction and connected to the blade.
  • the distal end surface extends radially outward from the first axial end of the inner peripheral surface and faces the first axial direction.
  • a front edge portion which is a first edge portion in the axial direction of the blade, extends radially inward from a boundary between the inner peripheral surface and the tip surface.
  • the distal end surface according to the first aspect may include a convex curved surface that is disposed on the other side in the axial direction toward the radially inner side.
  • the edge according to the first or second aspect may be provided with a protruding edge that protrudes radially outward on the first side in the axial direction.
  • the protruding edge portion is provided on the radially outer portion of the front edge portion of the blade, the inner peripheral surface and the tip end are provided via the protruding edge portion regardless of the shape of the front edge portion of the blade.
  • the leading edge of the blade can be formed continuously from the boundary with the surface.
  • the rotating machine includes the impeller according to any one of the first to third aspects.
  • an impeller manufacturing method is an impeller manufacturing method including a disk, a plurality of blades, and a cover.
  • the disc has a disk shape centered on the axis.
  • the plurality of blades are formed on the surface facing the first side in the axial direction of the disk at intervals in the circumferential direction of the axial line.
  • the cover surrounds the plurality of blades from the first side in the axial direction.
  • the cover includes an inner peripheral surface and a tip surface.
  • the inner peripheral surface is reduced in diameter toward the first side from the other side in the axial direction and connected to the blade.
  • the distal end surface extends radially outward from the first axial end of the inner peripheral surface and faces the first axial direction.
  • a front edge which is a first edge in the axial direction of the blade, is formed so as to extend radially inward from the boundary between the inner peripheral surface and the tip surface. Process. By doing in this way, the interference of the tool to a disk can be suppressed. Therefore, the impeller can be easily manufactured.
  • FIG. 2 It is a block diagram which shows schematic structure of the centrifugal compressor in 1st embodiment of this invention. It is an enlarged view of the impeller in 1st embodiment of this invention. It is a graph in which the horizontal axis represents the position in the span direction relative to the blade (Span Normalized), and the vertical axis represents the absolute value (Vt_abs) of the circumferential speed of the gas. It is a flowchart which shows the manufacturing method of the impeller in 1st embodiment of this invention. It is an enlarged view equivalent to FIG. 2 in 2nd embodiment of this invention. It is an enlarged view equivalent to FIG. 2 in the modification of 1st embodiment of this invention.
  • FIG. 1 is a configuration diagram showing a schematic configuration of a centrifugal compressor in the first embodiment of the present invention.
  • the centrifugal compressor 1 includes a rotating shaft 2, an impeller 3 ⁇ / b> A, a journal bearing 5 ⁇ / b> A, a thrust bearing 5 ⁇ / b> B, and a casing 6.
  • the rotary shaft 2 is formed in a column shape extending in the axis O direction.
  • the rotary shaft 2 is rotatably supported by the journal bearing 5A on the first end portion 2a side (first side in the axial direction) and the second end portion 2b side (second side in the axial direction) in the axis O direction. ing. Further, the rotary shaft 2 has a first end 2a supported by a thrust bearing 5B.
  • a plurality of impellers 3A are provided in the direction of the axis O with respect to the rotating shaft 2. These impellers 3A are attached to the rotary shaft 2 by fitting or the like.
  • the impeller 3A includes a disk 3a, a blade 3b, and a cover 3c.
  • the disk 3a is formed in a disk shape centered on the axis O. More specifically, the disk 3a has a diameter centered on the axis O as it goes from the side near the first end 2a of the rotary shaft 2 toward the side close to the second end 2b of the rotary shaft 2 in the direction of the axis O. It is formed so as to gradually expand in the direction.
  • the central axis of the disk 3 a overlaps the axis O of the rotary shaft 2. Therefore, in the following description, the axis of the disk 3a is also referred to as “axis O”.
  • the blade 3b is formed on the surface of the disk 3a facing the first end 2a side in the axis O direction, and a plurality of blades 3b are formed at intervals in the circumferential direction of the axis O. These blades 3b extend away from the disk 3a and are arranged radially about the axis O.
  • the cover 3c covers the plurality of blades 3b from the first end 2a side in the axis O direction.
  • the cover 3c is provided so as to face the disk 3a with the blade 3b interposed therebetween.
  • the inner peripheral surface 11 of the cover 3c is formed so as to decrease in diameter from the side close to the second end 2b in the axis O direction toward the side close to the first end 2a. From the inner peripheral surface 11, the blade 3b described above extends toward the disk 3a.
  • the impeller 3A has a surface of the disk 3a facing the first end portion 2a in the axis O direction, the blade 3b, and the inner peripheral surface 11 of the cover 3c from the side close to the first end portion 2a in the axis O direction.
  • a flow path extending toward the radially outer side is formed toward the side closer to the second end 2b.
  • the rotary shaft 2 of the centrifugal compressor 1 in this embodiment is provided with a plurality of impellers 3A in the direction of the axis O, thereby constituting a multistage impeller group 3G.
  • the casing 6 is formed in a cylindrical shape and accommodates the rotating shaft 2, the impeller 3A, the journal bearing 5A, and the like.
  • the casing 6 rotatably supports the rotary shaft 2 via the journal bearing 5A.
  • the impeller 3A attached to the rotary shaft 2 can rotate relative to the casing 6.
  • the casing 6 includes a suction port 6a, a connection channel 6b, a casing channel 6c, a connection channel 6d, and a discharge port 6e.
  • the suction port 6a is formed on the side close to the first end 2a of the casing 6 in the axis O direction.
  • the suction port 6a receives gas supplied from the outside.
  • the suction port 6a is disposed on the outermost surface 6f of the casing 6 on the side closest to the first end portion 2a in the axis O direction.
  • connection flow path 6b connects the suction port 6a and the first stage impeller 3A arranged closest to the first end 2a among the plurality of impellers 3A. That is, the connection flow path 6b supplies the gas received by the suction port 6a to the first stage impeller 3A.
  • the casing flow path 6c connects the flow paths of the impellers 3A adjacent in the axis O direction. More specifically, the impeller accommodating space near the outer peripheral end of the impeller 3A arranged on the upstream side and the impeller accommodating space near the front end of the impeller 3A arranged on the downstream side are communicated.
  • the casing flow path 6c guides the gas boosted by the impeller 3A disposed on the upstream side to the radially outer side, then guides the gas to the radially inner side and supplies it to the front end portion of the impeller 3A disposed on the downstream side. Thereby, the gas flowing through the casing flow path 6c is stepped up stepwise by the plurality of impellers 3A.
  • a diffuser, a return vane, or the like may be provided in the casing flow path 6c.
  • connection flow path 6d connects the final stage impeller 3A disposed on the side closest to the second end 2b and the discharge port 6e. That is, the connection flow path 6d guides the gas boosted by the multistage impeller group 3G to the discharge port 6e.
  • the discharge port 6 e discharges the gas guided by the connection flow path 6 d to the outside of the casing 6.
  • the outlet 6e is disposed on the outermost surface 6f of the casing 6 on the side closest to the second end 2b in the axis O direction.
  • FIG. 2 is an enlarged view of the impeller in the first embodiment of the present invention.
  • the cover 3 c of the impeller 3 ⁇ / b> A includes an inner peripheral surface 11, an outer peripheral surface 12, a front end surface 13, and a rear end surface 14.
  • the inner peripheral surface 11 has a shape as described above, and is a convex curved surface in a cross section including the axis O shown in FIG.
  • the outer peripheral surface 12 is directed from the side close to the second end 2 b in the axis O direction (the right side in FIG. 2) to the side close to the first end 2 a (the left side in FIG. 2).
  • the diameter is reduced according to the above.
  • the outer peripheral surface 12 is a concave curved surface in a cross section including the axis O shown in FIG.
  • the outer peripheral surface 12 is disposed so as to face the inner peripheral surface 6g of the casing 6 in which the impeller 3A is accommodated via a slight gap.
  • the outer peripheral surface 12 is gradually separated from the inner peripheral surface 11 as it goes from the side close to the second end 2b in the direction of the axis O toward the side close to the first end 2a.
  • the cover 3c is formed so that its thickness gradually increases from the side close to the second end 2b toward the side close to the first end 2a.
  • a seal mechanism such as a labyrinth seal may be provided between the inner peripheral surface 6g of the casing 6 and the outer peripheral surface 12 of the cover 3c.
  • the front end surface 13 extends from the end portion 11a of the inner peripheral surface 11 on the side close to the first end portion 2a in the axis O direction toward the outer side in the radial direction with the axis O as the center. That is, the tip surface 13 faces the first end 2a side in the axis O direction.
  • the tip surface 13 is formed across the end 11a of the inner peripheral surface 11 and the end 12a of the outer peripheral surface 12 on the side close to the first end 2a in the axis O direction.
  • the tip surface 13 is formed by a plane perpendicular to the axis O.
  • a flat surface facing the tip surface 13 is formed on the inner peripheral surface 6g of the casing 6 in this embodiment.
  • the rear end surface 14 is formed so as to extend over the end portion 11b of the inner peripheral surface 11 and the end portion 12b of the outer peripheral surface 12 on the side close to the second end portion 2b in the axis O direction.
  • the blade 3b includes a front edge portion 20 that is an edge portion on the side close to the first end portion 2a in the axis O direction.
  • the front edge portion 20 extends from the boundary portion K where the inner peripheral surface 11 and the tip surface 13 intersect toward the radially inner side with the axis O as the center.
  • the front edge portion 20 can be formed so as to be continuous with the distal end surface 13.
  • the front edge portion 20 in this embodiment is formed in a slightly curved shape close to a straight line.
  • the front edge 20 is further inclined with respect to a plane perpendicular to the axis O so as to be arranged on the second end 2b side from the radially outer side centering on the axis O toward the inner side.
  • the boundary K described above includes not only the position where the inner peripheral surface 11 and the tip surface 13 intersect, but also includes, for example, a position shifted by about 1 mm to 2 mm from the position where the inner peripheral surface 11 and the tip surface 13 intersect. (The same applies to the second embodiment below).
  • FIG. 3 is a graph in which the horizontal axis represents the position in the span direction with respect to the blade (Span Normalized), and the vertical axis represents the absolute value (Vt_abs) of the circumferential velocity of the gas.
  • a broken line is a comparative example.
  • the front edge 20 of the blade 3b extends radially inward from a position closer to the second end 2b than the boundary K.
  • the solid line is the case of the above-described embodiment (example). As shown in FIG.
  • the front edge 20 extends from the boundary K toward the inside in the radial direction. Therefore, immediately before the front edge portion 20 of the blade 3b, an increase in the absolute value of the circumferential speed of the gas due to contact between the gas and the cover 3c does not occur.
  • FIG. 4 is a flowchart showing a method for manufacturing an impeller in the first embodiment of the present invention.
  • a base material on which the outer peripheral surface 12 and the front end surface 13 of the cover 3c are formed is formed of a metal such as stainless steel (step S01).
  • the blade 3b, the inner peripheral surface 11 of the cover 3c, and the disk 3a are formed by cutting using a cutting tool T as shown in FIG. 2 (step S02).
  • the blade 3b is formed by cutting so that the front edge portion 20 of the blade 3b extends radially inward from the boundary K between the inner peripheral surface 11 and the tip surface 13 of the cover 3c.
  • finishing processing such as surface polishing is performed as necessary.
  • the cover 3c it is possible to prevent the cover 3c from projecting toward the first end 2a side in the axis O direction from the front edge 20 of the blade 3b. Therefore, it can suppress that a tool interferes with cover 3c, and can process it easily. Further, the rotation of the cover 3c can reduce the swirling flow generated immediately before the front edge 20 of the blade 3b due to the rotation of the cover 3c. Therefore, the boundary layer in the vicinity of the front edge portion 20 of the blade 3b can be thinned on the cover 3c side, and the performance of the impeller 3A can be improved.
  • FIG. 5 is an enlarged view corresponding to FIG. 2 in the second embodiment of the present invention.
  • the impeller 3B in the second embodiment includes a disk 3a, a blade 3b, and a cover 103c.
  • the cover 103c covers the plurality of blades 3b from the side close to the first end 2a in the axis O direction (the left side in FIG. 3).
  • the cover 103c is provided so as to face the disk 3a, and includes an inner peripheral surface 11, an outer peripheral surface 12, a front end surface 113, and a rear end surface 14.
  • the inner peripheral surface 11, the outer peripheral surface 12, and the rear end surface 14 have the same configuration as in the first embodiment described above. That is, the inner peripheral surface 11 is formed so as to decrease in diameter from the side close to the second end 2b in the axis O direction (the right side in FIG. 3) toward the side close to the first end 2a. From this inner peripheral surface 11, the blade 3b extends toward the disk 3a.
  • the outer peripheral surface 12 is formed so that its diameter decreases from the side close to the second end 2b in the axis O direction toward the side close to the first end 2a.
  • the outer peripheral surface 12 is disposed so as to face the inner peripheral surface 6g of the casing 6 to be accommodated with a slight gap. Since the outer peripheral surface 12 is close to the second end 2b side in the axis O direction, the outer peripheral surface 12 is gradually separated from the inner peripheral surface 11 toward the side close to the first end 2a.
  • the rear end surface 14 is formed across the end 11b of the inner peripheral surface 11 and the end 12b of the outer peripheral surface 12 on the side close to the second end 2b in the axis O direction.
  • the front end surface 113 extends from the end portion 11a of the inner peripheral surface 11 near the first end portion 2a in the axis O direction toward the outside in the radial direction with the axis O as the center. This front end surface 113 faces the first end portion 2a side in the axis O direction.
  • the tip surface 113 is formed across the end portion 11a of the inner peripheral surface 11 and the end portion 12a on the side of the outer peripheral surface 12 near the first end portion 2a. At least a part of the front end surface 113 in the second embodiment is a convex curved surface in a cross section including the axis O.
  • the cover 103c in the second embodiment has an outer periphery on the side where the end 11a of the inner peripheral surface 11 on the side close to the first end 2a is close to the first end 2a in the axis O direction. It arrange
  • the tip surface 113 formed across the end portion 11a and the end portion 12a is a first inner portion in the axis O direction from the outer side in the radial direction toward the inner side in the radial direction around the axis O.
  • a convex curved surface is formed so as to curve from the side close to the end 2a toward the side close to the second end 2b.
  • the blade 3b extends from the boundary K between the tip surface 113 and the inner peripheral surface 11 inward in the radial direction with the axis O as the center, as in the first embodiment. Also in the second embodiment, the front edge portion 20 of the blade 3b is formed in a curved shape that is slightly curved close to a straight line. The blade 3b is further inclined with respect to a plane perpendicular to the axis O so as to be arranged closer to the second end portion 2b as it goes inward from the outer side in the radial direction around the axis O.
  • the tip surface 113 has a convex curved surface, so that interference of the cutting tool T can be suppressed when performing cutting or the like. Even if the cutting tool T interferes, since it is a convex curved surface, it is possible to suppress the movement of the cutting tool T or the like, or the cutting tool T from being damaged.
  • FIG. 6 is an enlarged view corresponding to FIG. 2 in a modification of the first embodiment of the present invention.
  • the front edge portion 20 ⁇ / b> C of the impeller 3 ⁇ / b> C may include a protruding edge portion 22 that protrudes on the outer side in the radial direction on the side close to the first end portion 2 a in the axis O direction.
  • the protruding edge portion 22 is formed so as to protrude toward the first end portion 2a side in the axis O direction from the extension line E of the remaining portion 20Cb of the front edge portion 20C, and the axis O is centered from the boundary K. It is formed so as to extend obliquely toward the inner side in the radial direction and closer to the second end 2b and to be continuous with the remaining portion 20Cb.
  • the front edge 20C cannot be arranged on the side close to the first end 2a in the direction of the axis O as in the first embodiment, for example.
  • the front edge portion 20C can be formed so as to extend from the boundary portion K inward in the radial direction with the axis O as the center.
  • the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
  • the centrifugal compressor has been described as an example.
  • the present invention is not limited to the compressor, and can be applied to a rotating machine such as a turbine.
  • the centrifugal compressor 1 only needs to have at least one impeller 3 ⁇ / b> A with respect to the rotating shaft 2.
  • the impellers 3B and 3C are provided, only one impeller 3B and 3C may be provided.
  • the impellers 3A, 3B, and 3C are cut has been described.
  • they may be formed by electric discharge machining.
  • it is not necessary to form the discharge electrode in a complicated shape, and an increase in cost can be suppressed.
  • This invention can be applied to an impeller. According to this invention, it becomes possible to process easily.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une hélice, qui comporte : un disque (3a) formant une forme discoïdale centrée autour d'une ligne axiale ; de multiples pales (3b) formées dans la direction périphérique de la ligne axiale, avec des intervalles entre ces dernières, sur la surface du disque (3a) faisant face à un premier côté dans la direction de la ligne axiale ; et un capot (3c) renfermant ces multiples pales (3b) à partir du premier côté dans la direction de la ligne axiale. Le capot (3c) a une surface périphérique interne (11) dont le diamètre diminue à partir du second côté vers le premier côté dans la direction de la ligne axiale, et qui est reliée aux pales (3b), et une surface d'extrémité de pointe (13) qui s'étend à partir de la partie d'extrémité de la surface périphérique interne (11) sur le premier côté dans la direction de la ligne axiale vers l'extérieur dans la direction radiale, et qui fait face au premier côté dans la direction de la ligne axiale. Une partie de bord avant (20), qui est la partie de bord des pales (3b) sur le premier côté dans la direction de la ligne axiale, s'étend à partir de la limite (K) de la surface périphérique interne (11) et de la surface d'extrémité de pointe (13) vers l'intérieur dans la direction radiale.
PCT/JP2017/010391 2016-03-18 2017-03-15 Hélice, machine tournante, et procédé de fabrication d'hélice Ceased WO2017159730A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/083,412 US20190078583A1 (en) 2016-03-18 2017-03-15 Impeller, rotary machine, and impeller manufacturing method
EP17766726.8A EP3415767A4 (fr) 2016-03-18 2017-03-15 Hélice, machine tournante, et procédé de fabrication d'hélice

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016056045A JP2017172344A (ja) 2016-03-18 2016-03-18 インペラ、回転機械、およびインペラの製造方法
JP2016-056045 2016-03-18

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CN116710660A (zh) * 2021-04-22 2023-09-05 株式会社Ihi 叶轮、离心压缩机以及叶轮的制造方法

Citations (2)

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JP2017172344A (ja) 2017-09-28

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