WO2017122307A1 - 圧縮機インペラ及びその製造方法 - Google Patents
圧縮機インペラ及びその製造方法 Download PDFInfo
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- WO2017122307A1 WO2017122307A1 PCT/JP2016/050923 JP2016050923W WO2017122307A1 WO 2017122307 A1 WO2017122307 A1 WO 2017122307A1 JP 2016050923 W JP2016050923 W JP 2016050923W WO 2017122307 A1 WO2017122307 A1 WO 2017122307A1
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- Prior art keywords
- blade
- compressor impeller
- leading edge
- blades
- angle
- Prior art date
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- 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
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- 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
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- 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
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- 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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- 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
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- 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
- F05D2240/307—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 tip of a rotor blade
Definitions
- the present disclosure relates to a compressor impeller and a manufacturing method thereof.
- Compressors such as centrifugal compressors, axial flow compressors, and axial flow compressors are configured to impart kinetic energy to fluid by rotation of a compressor impeller and convert the kinetic energy into pressure to obtain a high-pressure fluid. ing.
- Such a compressor is required to have a high pressure ratio and high efficiency in a wide operating range, and various devices are applied.
- Patent Document 1 discloses a centrifugal compressor intended to suppress turning stall.
- Rotating stall is an unstable phenomenon in which the stall area generated in the blade propagates in the rotational direction from the blade to the blade at a speed slower than the peripheral speed of the impeller during operation in a low flow area.
- the compressor is provided on the inner peripheral surface of the casing or the outer peripheral surface of the rotation shaft of the impeller on the upstream side of the blade leading edge of the impeller, and rotates relative to the blade.
- a suppression member that suppresses the growth of the vortex of the fluid formed in the vicinity of the edge, the rotation stall is suppressed.
- This invention is made in view of the subject mentioned above, Comprising: It is providing the compressor impeller which can suppress a rotation stall with a simple structure, and its manufacturing method.
- a compressor impeller is a blade group including a hub and a plurality of blades arranged along the circumferential direction on the outer peripheral surface of the hub, and each of the blades A blade group configured so that the hub side ends of the leading edge are aligned on the same circle, wherein the plurality of blades have at least one first blade, and the shape of the first blade
- the blade angle of the leading edge of the first blade and the blade angle of the leading edge of the second blade are compared at the same position in the radial direction of the compressor impeller.
- the blade angle of the leading edge of the first blade is different from the blade angle of the leading edge of the second blade in at least a partial range in the radial direction of the compressor impeller.
- the blade angle of the leading edge of the first blade and the leading edge of the second blade of the blade group configured such that the hub side ends of the leading edge are aligned on the same circle.
- the blade angle of the leading edge of the first blade and the front of the second blade are at least partially in the radial direction of the compressor impeller.
- the edge wing angle is different.
- the stall characteristics of the first blade and the stall characteristics of the second blade can be made different from each other among the stall characteristics of a plurality of blades configured such that the hub side ends of the leading edge are aligned on the same circle.
- the at least one first blade includes a plurality of first blades
- the at least one second blade includes a plurality of first blades.
- the number of the second blades included in the blade group is smaller than the number of the first blades included in the blade group, and the plurality of second blades are arranged between the first blades. Includes a pair of second blades that are not disposed.
- the number of the second blades included in the blade group is the number of the first blades included in the blade group.
- the compressor impeller In at least a partial range in the radial direction, the blade angle of the leading edge of the second blade is larger than the blade angle of the leading edge of the second blade.
- the blade angle of the leading edge of the relatively large number of first blades is a relatively small blade angle considering the intake air volume on the large flow rate side.
- the blade angle of the leading edge of the second blade with a small number of sheets is a relatively large blade angle matched to the small flow rate side (it is difficult to stall even at low flow). Therefore, it is possible to inhibit the uniform propagation and development of the rotating stall while suppressing a reduction in the intake air volume of the compressor impeller.
- the blade angle at the tip side end of the leading edge of the second blade is at the tip side end of the leading edge of the first blade. Greater than wing angle.
- the rotational stall in the compressor impeller is likely to occur in the region on the tip side of the blade. For this reason, as described in the above (4), by making the blade angle at the tip side end of the leading edge of the second blade larger than the blade angle at the tip side end of the leading edge of the first blade, the turning stall is reduced. It can be effectively suppressed.
- the blade angle at the tip side end of the leading edge of the second blade is at the tip side end of the leading edge of the first blade. More than 5 degrees larger than the wing angle.
- the blade angle at the hub side end of the leading edge of the first blade may be the leading edge of the second blade. It is equal to the blade angle at the hub side end.
- the rotational stall in the compressor impeller is likely to occur in the region on the tip side of the blade, so the blade angle at the hub side end of the leading edge of the second blade is set at the hub side end of the leading edge of the first blade. Even if it is larger than the blade angle, the effect of suppressing the turning stall is relatively small.
- configuring the second blade so as to have a large blade angle matched to the small flow rate side in a wide range in the radial direction of the compressor impeller can cause a reduction in the intake air amount of the compressor impeller.
- the blade angle at the tip side end of the leading edge of the second blade is made larger than the blade angle at the tip side end of the leading edge of the first blade, as described in (6) above,
- the blade angle at the hub side end of the leading edge is made equal to the blade angle at the hub side end of the leading edge of the second blade, so that a reduction in the suction air volume of the compressor impeller is suppressed and uniform propagation of the rotation stall and Can inhibit development.
- the blade angle of the leading edge of the first blade and the blade angle of the leading edge of the second blade are set to the compressor impeller.
- the blade angle of the leading edge of the second blade is a tip from a predetermined position that is 50% or more of the blade height of the second blade in the radial direction of the compressor impeller.
- the first blade is larger than the blade angle of the leading edge of the first blade in the range to the side end. Is equal to the wing angle of the leading edge.
- the first blade and the second blade are in an axial direction of the compressor impeller. Only the shape on the upstream side from the reference position is different, and the shape on the downstream side from the reference position in the axial direction of the compressor impeller is the same.
- the first blade and the second blade have a shape on the leading edge side that is likely to contribute to the improvement of the rotating stall (upstream from the reference position in the axial direction of the compressor impeller).
- the shape of the trailing edge (the shape on the downstream side from the reference position in the axial direction of the compressor impeller) that is unlikely to contribute to the improvement of the turning stall and easily affects the blade element performance is the same. Has been. Thereby, since a turning stall can be suppressed, suppressing the fall of blade element performance, the performance of a compressor impeller can be improved effectively.
- the reference position is the tip side end of the leading edge of the blade adjacent to the suction surface side of the second blade. It is a position upstream from the intersection of the perpendicular drawn to the suction surface of the two blades and the suction surface.
- a manufacturing method for manufacturing a compressor impeller according to at least one embodiment of the present invention is a manufacturing method for manufacturing the compressor impeller according to any one of (1) to (9) above.
- a first blade forming step for forming a plurality of first blades having the same shape, and bending processing is performed on a front edge side portion of a part of the first blades among the plurality of first blades formed in the first blade forming step.
- a compressor impeller capable of suppressing a rotating stall with a simple configuration and a manufacturing method thereof are provided.
- FIG. 1 is an axial view of a compressor impeller 100 (100A) according to an embodiment. It is a figure showing a part of meridional section along an axis of compressor impeller 100 (100A) concerning one embodiment.
- FIG. 3 is a schematic diagram for explaining the shapes of a first blade 12 and a second blade 14.
- FIG. 3 is a blade development view schematically showing the positional relationship of a plurality of blades 4 on the tip side.
- a line indicating the blade 4 is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4.
- FIG. 3 is a blade row development view schematically showing a positional relationship of a plurality of blades 4 on the hub side.
- a line indicating the blade 4 is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4. It is a figure which shows typically the state of the turning stall in a comparison form.
- a line indicating the blade 4 is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4. It is a figure which shows typically the state of the turning stall in embodiment.
- a line indicating the blade 4 is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4. It is a figure which shows the comparison of the surge line in embodiment and a comparison form. It is the schematic for demonstrating the other example of the shape of the 1st braid
- FIG. 4 a line indicating the blade 4 is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4. It is an axial view of the compressor impeller 100 (100B) according to one embodiment. It is a figure showing a part of meridional section along an axis of compressor impeller 100 (100B) concerning one embodiment.
- FIG. 6 is a blade development diagram schematically showing an example of a positional relationship between a plurality of full blades 4f and a plurality of splitter blades 4s on the chip side.
- the line indicating the blade 4 (4f, 4s) is a camber line connecting the midpoint between the suction surface and the pressure surface of the blade 4 (4f, 4s).
- FIG. 6 is a blade development diagram schematically showing an example of a positional relationship between a plurality of full blades 4f and a plurality of splitter blades 4s on the chip side.
- the line indicating the blade 4 (4f, 4s) is a camber line connecting the intermediate points between the suction surface and the pressure surface of the blade 4 (4f, 4s).
- FIG. 6 is a blade development diagram schematically showing an example of a positional relationship between a plurality of full blades 4f and a plurality of splitter blades 4s on the chip side.
- the line indicating the blade 4 (4f, 4s) is a camber line connecting the midpoint between the suction surface and the pressure surface of the blade 4 (4f, 4s). It is a figure showing a part of meridional section along an axis of compressor impeller 100 concerning one embodiment.
- an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
- expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
- the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
- FIG. 1 is an axial view of a compressor impeller 100 (100A) according to an embodiment.
- FIG. 2 is a diagram showing a part of a meridional section along the axis of the compressor impeller 100 (100A) shown in FIG.
- the compressor impeller 100 is a blade group 6 including a hub 2 and a plurality of blades 4 arranged on the outer peripheral surface 2a of the hub 2 at intervals in the circumferential direction.
- a blade group 6 configured such that the front end hub side end 4A of each blade 4 is aligned on the same circle C1 centering on the rotation axis O of the compressor impeller.
- the blade group 6 is configured such that the positions of the hub side ends 4A of the plurality of blades 4 in the axial direction of the compressor impeller 100 are the same.
- the plurality of blades 4 include at least one first blade 12 and at least one second blade 14 having a shape different from that of the first blade 12.
- FIG. 3 is a schematic view for explaining the shapes of the first blade 12 and the second blade 14.
- FIG. 4 is a blade development diagram schematically showing the positional relationship of the plurality of blades 4 on the tip side.
- FIG. 5 is a blade development view schematically showing the positional relationship of the plurality of blades 4 on the hub side. 4 and 5, the horizontal axis indicates the position r ⁇ in the circumferential direction of the compressor impeller 100, and the vertical axis indicates the distance from the leading edge 12LE in the meridional surface direction m. As shown in FIG.
- the “meridional surface direction m” refers to a direction along a line connecting points having equal blade height ratios from the leading edge 12 LE to the trailing edge 12 TE of the blade 4 in the meridional section of the impeller 100. Means.
- the “blade height ratio” is defined as follows. First, as shown in FIG. 15, the meridian length from the position of the leading edge 12LE at the hub side end of the blade 4 to the position of the trailing edge 12TE is mh, and from the position of the leading edge 12LE at the tip end of the blade 4 The meridian length to the position of the trailing edge 12TE is assumed to be mt.
- the ratio of the meridional length from the position of the leading edge 12LE at the hub side end of the blade 4 to a certain position P divided by the meridional length mh and the position of the leading edge 12LE at the tip end of the blade 4 Position P and position Q such that the ratio of meridional length up to a certain position Q divided by meridional length mh is equal (for example, position P and position Q where the two ratios are 20%, respectively) )
- Is defined as the blade height h at a certain meridional surface position (%).
- a value y / h obtained by dividing the distance y from the outer peripheral surface 2a of the hub 2 in the blade height direction along the line segment by the blade height h is defined as a blade height ratio.
- the blade angle ⁇ 1 at the leading edge 12LE of the first blade 12 and the blade angle ⁇ 2 at the leading edge 14LE of the second blade 14 are compared at the same position r in the radial direction of the compressor impeller 100.
- the blade angle ⁇ 1 at the front edge 12LE of the first blade 12 and the blade angle ⁇ 2 at the front edge 14LE of the second blade 14 are different in at least a partial range w1 in the radial direction of the compressor impeller 100.
- the “blade angle ⁇ ” means an angle ⁇ (see, for example, FIG. 4) formed by the meridional surface direction m and the camber line at a certain blade height ratio y / h. It is defined by the following equation (1) using the position r ⁇ in the direction.
- the stall characteristics of the first blade 12 and the second blade among the stall characteristics of the plurality of blades 4 can be made different. Therefore, compared with the case where the shapes of the plurality of blades 4 are uniform, the uniform propagation and development of the turning stall can be inhibited. Thereby, the characteristics on the low flow rate side of the compressor can be improved. Further, since a restraining member as an additional part as described in the prior art (Japanese Patent Application Laid-Open No. 2014-118916) is not required, the configuration can be simplified as compared with the prior art.
- the at least one first blade 12 includes a plurality of first blades 12, and the at least one second blade 14 includes a plurality of second blades 14.
- the number of the second blades 14 included in the blade group 6 is smaller than the number of the first blades 12 included in the blade group 6.
- the plurality of second blades 14 include a pair of second blades 14 in which the first blades 12 are not disposed between each other in the circumferential direction of the compressor impeller 100.
- the blade group 6 includes six blades 4, and the six blades 4 include four first blades 12 and two second blades 14. Further, the first blade 12 is not disposed between the two second blades 14.
- the said effect to inhibit can be heightened.
- the blade angle ⁇ 1 of the leading edge 12LE of the first blade 12 and the blade angle ⁇ 2 of the leading edge 14LE of the second blade 14 are set in the radial direction of the compressor impeller 100.
- the blade angle ⁇ 2 of the leading edge 14LE of the second blade 14 is equal to the blade of the leading edge 12LE of the first blade 12 in at least a partial range w1 in the radial direction of the compressor impeller 100. It is larger than the angle ⁇ 1.
- leading edges 12LE of the first blades 12 have a relatively small blade angle ⁇ 1 in consideration of the intake air amount on the large flow rate side in the above range 21, the reduction in the intake air amount of the compressor impeller 100 is suppressed. be able to. For this reason, the fall of the suction
- the blade angle ⁇ 2 at the tip side end 14E of the leading edge 14LE of the second blade 14 is larger than the blade angle ⁇ 1 at the tip side end 12E of the leading edge 12LE of the first blade 12. .
- it is desirable that the blade angle ⁇ 2 at the tip side end 14E of the leading edge 14LE of the second blade 14 is larger than the blade angle ⁇ 1 at the tip side end 12E of the leading edge 12LE of the first blade 12 by 5 degrees or more.
- the rotating stall in the compressor impeller is likely to occur in the tip side region of the leading edge of the blade.
- the blade angle ⁇ 2 of the tip side end 14E of the leading edge 14LE of the second blade 14 is made larger than the blade angle ⁇ 1 of the tip side end 12E of the leading edge 12LE of the first blade 12, thereby turning. Stall can be effectively suppressed.
- the blade angle ⁇ 2 of the hub side end 14A of the leading edge 14LE of the second blade 14 is equal to the blade angle ⁇ 1 of the hub side end 12A of the leading edge 12LE of the first blade 12 in FIG. .
- the rotating stall in the compressor impeller is likely to occur in the tip side region of the blade, so the blade angle ⁇ 2 at the hub side end 14A of the leading edge 14LE of the second blade 14 is set to the leading edge of the first blade 12. Even if the blade angle is larger than the blade angle ⁇ 1 at the hub side end 12A of 12LE, the effect of suppressing the turning stall is relatively small. Further, configuring the second blade 14 so as to have a large blade angle ⁇ 2 matched to the small flow rate side in a wide range in the radial direction of the compressor impeller 100 can be a factor of reducing the intake air amount of the compressor impeller 100. .
- the blade angle ⁇ 2 at the tip side end 14E of the leading edge 14LE of the second blade 14 is made larger than the blade angle ⁇ 1 at the tip side end 12E of the leading edge 12LE of the first blade 12, while 2
- the blade angle at the hub side end 14A of the leading edge 14LE of the blade 14 equal to the blade angle ⁇ 1 at the hub side end 12A of the leading edge 12LE of the first blade 12
- the blade angle ⁇ 1 of the leading edge 12LE of the first blade 12 and the blade angle ⁇ 2 of the leading edge 14LE of the second blade 14 are the same in the radial direction of the compressor impeller 100.
- the blade angle ⁇ 2 of the leading edge 14LE of the second blade 14 is a predetermined position P1 (for example, the first blade 14h) of 50% or more of the blade height h of the second blade 14 in the radial direction of the compressor impeller 100.
- the blade angle ⁇ 1 of the leading edge 12LE of the first blade 12 is equal.
- the rotating stall in the compressor impeller is likely to occur in the tip side region of the leading edge of the blade, so the blade angle ⁇ 2 on the hub side of the leading edge 14LE of the second blade 14 is set to the leading edge of the first blade. Even if the blade angle is larger than the blade angle ⁇ 1 on the hub side of 12LE, the effect of suppressing the turning stall is relatively small. Further, configuring the second blade 14 so that the leading edge 14LE has a large blade angle ⁇ 2 matched to the small flow rate side in a wide range in the radial direction of the compressor impeller 100 reduces the intake air amount of the compressor impeller 100. Can be a factor.
- the blade angle ⁇ 2 of the leading edge 14LE of the second blade 14 ranges from a predetermined position P1 of 50% or more of the blade height h of the second blade 14 in the radial direction of the compressor impeller 100 to the tip side end 14E.
- w1 in the range w2 from the hub side end 14A of the second blade 14 to the predetermined position P1 in the radial direction of the compressor impeller 100 while being larger than the blade angle ⁇ 1 of the leading edge 12LE of the first blade 12.
- the first blade 12 and the second blade 14 differ only in the shape of the upstream side from the reference position P2 in the axial direction of the compressor impeller 100, and the compressor The shape on the downstream side from the reference position P2 in the axial direction of the impeller 100 is the same.
- the shapes of the trailing edges of the plurality of blades 4 be uniform. That is, it is desirable that the shape of the trailing edge 12TE side of the blade 12 and the shape of the trailing edge 14TE side of the blade 14 are the same. For this reason, the first blade 12 and the second blade 14 are different only in the shape of the leading edge side (the shape on the upstream side from the reference position P2 in the axial direction of the compressor impeller 100) that easily contributes to the improvement of the turning stall.
- the trailing edge side shape (shape on the downstream side from the reference position P2 in the axial direction of the compressor impeller 100) that is unlikely to contribute to the improvement of the stall and easily affect the blade element performance is configured to be the same. Thereby, since a turning stall can be suppressed, suppressing the fall of blade element performance, the performance of the compressor impeller 100 can be improved effectively.
- the reference position P ⁇ b> 2 is the tip side end of the front edge of the blade 4 adjacent to the suction surface 14 ⁇ / b> S side of the second blade 14 (first shape in the illustrated form). This is a position upstream from the intersection P3 (the throat position of the second blade) between the normal line L drawn from the tip side end 12E of the leading edge 12LE of the blade 12 to the suction surface 14S of the second blade 14 and the suction surface 14S. .
- the throat between the blade 4 adjacent to the suction surface 14S side of the second blade 14 and the second blade 14 is provided. While suppressing the change of the width S, the blade angle ⁇ 1 of the first blade 12 and the blade angle ⁇ 2 of the second blade 14 can be made different as described above. Therefore, it is possible to suppress the turning stall while suppressing a decrease in the intake air volume of the compressor impeller 100.
- the above-described compressor impeller 100 can be manufactured by, for example, machining or casting, but a first blade forming step for forming a plurality of first blades 12 having the same shape, and a first blade formation Among the plurality of first blades 12 formed in the process, only a part 12P (see FIG. 3) on the tip side and the front edge side of some of the first blades 12 is smoothly curved in an arc shape on the pressure surface side.
- the second blade can be obtained simply by bending the first blade 12 created through the first blade forming step. 14 can be formed, the compressor impeller 100 can be easily manufactured.
- the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
- the first blade 12 and the second blade 14 differ only in the shape of the upstream side from the reference position P2 in the axial direction of the compressor impeller 100, and from the reference position P2 in the axial direction of the compressor impeller 100.
- the form where the downstream shape is the same is shown.
- the present invention is not limited to such a form.
- the second blade 14 is different from the first blade 12 in the entire range of the second blade 14 in the axial direction of the compressor impeller 100.
- You may have a shape.
- the blade angle ⁇ 1 at the leading edge 12LE of the first blade 12 and the blade angle ⁇ 2 at the leading edge 14LE of the second blade 14 are the same in the radial direction of the compressor impeller 100.
- the blade angle ⁇ 1 at the leading edge 12LE of the first blade 12 and the blade angle ⁇ 2 at the leading edge 14LE of the second blade 14 are different in at least a partial range in the radial direction of the compressor impeller 100. That's fine. Thereby, as mentioned above, uniform propagation and development of turning stall can be suppressed.
- the change in the throat width S between the blade 4 adjacent to the suction surface 14S side of the second blade 14 and the second blade 14 is suppressed as described above. Since the blade angle ⁇ 1 of the first blade 12 and the blade angle ⁇ 2 of the second blade 14 can be made different from each other, from the viewpoint of suppressing a reduction in the intake air volume of the compressor impeller 100, the configuration shown in FIG. Is preferable to the embodiment shown in FIG.
- one blade group 6 (one blade group 6 including a plurality of blades 4 arranged on the outer peripheral surface 2 a of the hub 2 at intervals in the circumferential direction,
- the compressor impeller 100 having the blade group 6) configured so that the hub side end 4A of the edge is aligned on the same circle C centering on the rotation axis O of the compressor impeller is illustrated.
- the compressor impeller 100 may include a plurality of blade groups.
- the compressor impeller 100 (100B) includes two blade groups, a full blade group 6f and a splitter blade group 6s.
- the full blade group 6f includes a plurality of full blades 4f arranged on the outer peripheral surface 2a of the hub 2 at intervals in the circumferential direction.
- the hub side end 4Af of the front edge in each of the full blades 4f is aligned on the same circle Cf around the rotation axis O of the compressor impeller.
- the splitter blade group 6s is composed of a plurality of splitter blades 4s arranged on the outer peripheral surface 2a of the hub 2 at intervals in the circumferential direction.
- the splitter blade 4s has a blade length shorter than that of the full blade 4f, and each of the plurality of splitter blades 4s is provided between two full blades 4f adjacent to each other.
- the hub-side end 4As at the front edge of each of the plurality of splitter blades 4s is aligned on the same circle Cs with the rotation axis O of the compressor impeller 100 as the center.
- the hub-side end 4As at the front edge of the plurality of splitter blades 4s is located downstream of the hub-side end 4Af at the front edge of the plurality of full blades 4f.
- the circle Cs has a larger radius than the circle Cf and is located downstream of the circle Cf in the suction direction of the compressor impeller 100.
- the invention relating to the blade group 6 of the compressor impeller 100 (100A) described with reference to FIGS. 1 to 9 is applied only to the full blade group 6f as shown in FIG. Alternatively, it may be applied only to the splitter blade group 6s as shown in FIG. 13, or may be applied to each of the full blade group 6f and the splitter blade group 6s as shown in FIG. .
- the plurality of full blades 4f constituting the full blade group 6f includes at least one first blade 12f and at least one second blade 14f having a shape different from that of the first blade 12f.
- the blade angle ⁇ 1f of the leading edge 12LEf of the first blade 12f and the blade angle ⁇ 2f of the leading edge 14LEf of the second blade 14f are compared at the same position in the radial direction of the compressor impeller 100, the compressor impeller
- the blade angle ⁇ 1f of the front edge 12LEf of the first blade 12f is different from the blade angle ⁇ 2f of the front edge 14LEf of the second blade 14f in at least a partial range in the radial direction of 100 (see range w1 in FIG. 3).
- the stall characteristics of the first blade 12f and the stall characteristics of the second blade 14f among the stall characteristics of the plurality of full blades 4f configured so that the hub side ends 4Af of the leading edge are aligned on the same circle. Can be different. Therefore, compared with the case where the shape of the plurality of full blades 4f is uniform, the uniform propagation and development of the turning stall can be inhibited. Thereby, the characteristics on the low flow rate side of the compressor can be improved. Further, since a restraining member as an additional part as described in the prior art (Japanese Patent Application Laid-Open No. 2014-118916) is not required, the configuration can be simplified as compared with the prior art.
- the plurality of splitter blades 4s constituting the splitter blade group 6s includes at least one first blade 12s and at least one second blade 14s having a shape different from that of the first blade 12s. Further, when the blade angle ⁇ 1s of the leading edge 12LEs of the first blade 12s and the blade angle ⁇ 2s of the leading edge 14LEs of the second blade 14s are compared at the same position in the radial direction of the compressor impeller 100, the compressor impeller The blade angle ⁇ 1s of the leading edge 12LEs of the first blade 12s and the blade angle ⁇ 2s of the leading edge 14LEs of the second blade 14s are different in at least a partial range in the radial direction of 100 (see the range w1 in FIG. 3).
- the stall characteristics of the first blade 12s and the stall characteristics of the second blade 14s among the stall characteristics of the plurality of splitter blades 4s configured so that the hub side ends 4As of the leading edge are aligned on the same circle. Can be different. Therefore, compared with the case where the shape of the plurality of splitter blades 4s is uniform, the uniform propagation and development of the rotation stall can be inhibited. Thereby, the characteristics on the low flow rate side of the compressor can be improved. Moreover, since the suppression member as an additional component as described in the above prior art is not required, the configuration can be simplified as compared with the prior art.
- the plurality of full blades 4f constituting the full blade group 6f include at least one first blade 12f and at least one second blade 14f having a shape different from that of the first blade 12f.
- the blade angle ⁇ 1f of the leading edge 12LEf of the first blade 12f and the blade angle ⁇ 2f of the leading edge 14LEf of the second blade 14f are compared at the same position in the radial direction of the compressor impeller 100, the compressor impeller
- the blade angle ⁇ 1f of the front edge 12LEf of the first blade 12f is different from the blade angle ⁇ 2f of the front edge 14LEf of the second blade 14f in at least a partial range in the radial direction of 100 (see range w1 in FIG. 3).
- the plurality of splitter blades 4s constituting the splitter blade group 6s include at least one first blade 12s and at least one second blade 14s having a shape different from that of the first blade 12s.
- the blade angle ⁇ 1s of the leading edge 12LEs of the first blade 12s and the blade angle ⁇ 2s of the leading edge 14LEs of the second blade 14s are compared at the same position in the radial direction of the compressor impeller 100, the compressor impeller
- the blade angle ⁇ 1s of the leading edge 12LEs of the first blade 12s and the blade angle ⁇ 2s of the leading edge 14LEs of the second blade 14s are different in at least a partial range in the radial direction of 100 (see the range w1 in FIG. 3).
- the stall characteristics of the first blade 12f and the stall characteristics of the second blade 14f among the stall characteristics of the plurality of full blades 4f configured so that the hub side ends 4Af of the leading edge are aligned on the same circle. Can be different. Therefore, compared with the case where the shape of the plurality of full blades 4f is uniform, the uniform propagation and development of the turning stall can be inhibited. Further, among the stall characteristics of the plurality of splitter blades 4s configured such that the hub side end 4As of the leading edge is aligned on the same circle, the stall characteristics of the first blade 12s and the stall characteristics of the second blade 14s are made different. be able to.
- the configuration can be simplified as compared with the prior art.
- the centrifugal compressor is exemplified.
- the present invention is not limited to the centrifugal compressor, and may be applied to an axial flow compressor or a mixed flow compressor.
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Abstract
Description
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
例えば、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
一方、一の構成要素を「備える」、「具える」、「具備する」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。
図4及び図5では、横軸は圧縮機インペラ100の周方向における位置rθを示しており、縦軸は子午面方向mにおける前縁12LEからの距離を示している。なお、「子午面方向m」とは、図15に示すように、インペラ100の子午断面において、ブレード4の前縁12LEから後縁12TEにかけて翼高さ比が等しい点を結んだ線に沿う方向を意味する。ここで、「翼高さ比」とは、以下のように定義される。まず、図15に示すように、ブレード4のハブ側端における前縁12LEの位置から後縁12TEの位置までの子午面長さをmhとし、ブレード4のチップ側端における前縁12LEの位置から後縁12TEの位置までの子午面長さをmtとする。そして、ブレード4のハブ側端における前縁12LEの位置からある位置Pまでの子午面長さを上記子午面長さmhで除した割合と、ブレード4のチップ側端における前縁12LEの位置からある位置Qまでの子午面長さを上記子午面長さmhで除した割合とが等しくなるような位置Pと位置Q(例えば上記二つの割合がそれぞれ20%となるような位置Pと位置Q)について、位置Pと位置Qとを結ぶ線分の長さを、ある子午面方向位置(%)における翼高さhと定義する。そして、上記線分に沿った翼高さ方向におけるハブ2の外周面2aからの距離yを翼高さhで除した値y/hを翼高さ比と定義する。
2a 外周面
4 ブレード
4A 前縁のハブ側端
4f フルブレード
4s スプリッタブレード
6 ブレード群
6f フルブレード群
6s スプリッタブレード群
12 第1ブレード
12LE 前縁
12E 前縁のチップ側端
12A 前縁のハブ側端
12P 一部分
14 第2ブレード
14LE 前縁
14E 前縁のチップ側端
14A 前縁のハブ側端
14S 負圧面
100 圧縮機インペラ
C1 円
C2 円
L 垂線
O 回転軸線
P1 所定位置
P2 基準位置
P3 交点
w1,w2 範囲
r,z 位置
Claims (10)
- ハブと、
前記ハブの外周面に周方向に沿って配列された複数のブレードからなるブレード群であって、前記ブレードの各々における前縁のハブ側端が同一円上に揃うように構成されたブレード群と、を備える圧縮機インペラであって、
前記複数のブレードは、少なくとも一つの第1ブレードと、前記第1ブレードと形状が異なる少なくとも一つの第2ブレードとを含み、
前記第1ブレードの前縁の翼角と前記第2ブレードの前縁の翼角とを、前記圧縮機インペラの径方向における同一位置にて比較したときに、前記圧縮機インペラの径方向における少なくとも一部の範囲において、前記第1ブレードの前縁の翼角と前記第2ブレードの前縁の翼角とが異なる、圧縮機インペラ。 - 前記少なくとも一つの第1ブレードは、複数の第1ブレードを含み、
前記少なくとも一つの第2ブレードは、複数の第2ブレードを含み、
前記ブレード群が備える前記第2ブレードの枚数は、前記ブレード群が備える前記第1ブレードの枚数よりも少なく、
前記複数の第2ブレードは、互いの間に前記第1ブレードが配置されない一対の第2ブレードを含む、請求項1に記載の圧縮機インペラ。 - 前記ブレード群が備える前記第2ブレードの枚数は、前記ブレード群が備える前記第1ブレードの枚数よりも少なく、
前記第1ブレードの前縁の翼角と前記第2ブレードの前縁の翼角とを、前記圧縮機インペラの径方向における同一位置にて比較したときに、前記圧縮機インペラの径方向における少なくとも一部の範囲において、前記第2ブレードの前縁の翼角が前記第1ブレードの前縁の翼角より大きい、請求項1又は2に記載の圧縮機インペラ。 - 前記第2ブレードの前縁のチップ側端における翼角は、前記第1ブレードの前縁のチップ側端における翼角より大きい請求項3に記載の圧縮機インペラ。
- 前記第2ブレードの前縁のチップ側端における翼角は、前記第1ブレードの前縁のチップ側端における翼角より5度以上大きい、請求項4に記載の圧縮機インペラ。
- 前記第2ブレードの前縁のハブ側端における翼角は、前記第1ブレードの前縁のハブ側端における翼角と等しい、請求項4又は5に記載の圧縮機インペラ。
- 前記第1ブレードの前縁の翼角と前記第2ブレードの前縁の翼角とを、前記圧縮機インペラの径方向における同一位置にて比較したときに、
前記第2ブレードの前縁の翼角は、前記圧縮機インペラの径方向における前記第2ブレードの翼高さの50%以上の所定位置からチップ側端までの範囲において、前記第1ブレードの前縁の翼角よりも大きく、前記圧縮機インペラの径方向における前記第2ブレードのハブ側端から前記所定位置までの範囲において、前記第1ブレードの前縁の翼角と等しい、請求項6に記載の圧縮機インペラ。 - 前記第1ブレードと前記第2ブレードとは、前記圧縮機インペラの軸方向における基準位置から上流側の形状のみが異なり、前記圧縮機インペラの軸方向における前記基準位置から下流側の形状が同一である、請求項4乃至7の何れか1項に記載の圧縮機インペラ。
- 前記基準位置は、前記第2ブレードの負圧面側に隣接する前記ブレードの前縁のチップ側端から前記第2ブレードの前記負圧面に引いた垂線と、前記負圧面との交点より上流側の位置である、請求項8に記載の圧縮機インペラ。
- 請求項1乃至9の何れか1項に記載の圧縮機インペラを製造する製造方法であって、
同一形状を有する複数の第1ブレードを形成する第1ブレード形成工程と、
前記第1ブレード形成工程で形成した複数の第1ブレードのうち、一部の第1ブレードの前縁側部分に曲げ加工を施すことにより、前記少なくとも一つの第2ブレードを形成する第2ブレード形成工程と、
を備える圧縮機インペラの製造方法。
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CN201680069375.0A CN108603513B (zh) | 2016-01-14 | 2016-01-14 | 压缩机叶轮及其制造方法 |
PCT/JP2016/050923 WO2017122307A1 (ja) | 2016-01-14 | 2016-01-14 | 圧縮機インペラ及びその製造方法 |
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US11506059B2 (en) | 2020-08-07 | 2022-11-22 | Honeywell International Inc. | Compressor impeller with partially swept leading edge surface |
EP3951188B1 (en) * | 2020-08-07 | 2024-05-29 | Honeywell International Inc. | Compressor impeller with partially swept leading edge surface |
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