US10385877B2 - Fluid machine - Google Patents
Fluid machine Download PDFInfo
- Publication number
- US10385877B2 US10385877B2 US15/421,845 US201715421845A US10385877B2 US 10385877 B2 US10385877 B2 US 10385877B2 US 201715421845 A US201715421845 A US 201715421845A US 10385877 B2 US10385877 B2 US 10385877B2
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- United States
- Prior art keywords
- shroud
- blades
- flow passage
- resonators
- hub
- 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.)
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Classifications
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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
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/685—Inducing localised fluid recirculation in the stator-rotor interface
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
-
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/526—Details of the casing section radially opposing blade tips
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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
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/914—Device to control boundary layer
Definitions
- Apparatuses consistent with exemplary embodiments relate to a fluid machine, and more particularly, to a fluid machine having improved aerodynamics performance and reduced noise generation.
- Compressors, expanders, or pumps which compress or expand fluid, have a fluid machine using a rotation element.
- a fluid machine has an impeller as a rotation element.
- the impeller transfers rotational dynamic energy to fluid thereby increasing the pressure of fluid.
- the impeller includes a plurality of blades that guide movement of fluid and transfer energy to the fluid.
- a shroud is arranged outside the impeller, and the shroud forms a passage for passing fluid together with the blades.
- aerodynamics performance in the passage formed by the impeller and the shroud needs to be enhanced.
- U.S. Pat. No. 5,256,031 discloses that a groove is formed on a casing wall to reduce vibration.
- a groove-forming technology such as this seriously increases aerodynamic loss.
- Japanese Publication No. 2007-218147 discloses technology by which a hole is formed in a shroud to reduce noise. As such, a simple structure in which a hole is formed in a wall of the shroud seriously increases aerodynamic loss.
- Japanese Publication No. 2002-537184, Korean Publication No. 1998-0060499, and U.S. Pat. No. 4,540,335 disclose technologies using a hole to improve noise or improve flow rate properties.
- a structure is used in which a hole is formed at a position of a casing corresponding to a tip (end portion) of a rotating blade, it is difficult to apply the structure to improve aerodynamics performance and reduce noise in a fluid machine using a shroud covering an upper surface of a rotating blade.
- One or more exemplary embodiments provide a fluid machine having reduced noise generation by arranging resonators on a shroud.
- One or more exemplary embodiments also provide a fluid machine having resonators for reducing noise and simultaneously having improved aerodynamics performance.
- a fluid machine may include a rotatable hub, a plurality of blades arranged around the hub and spaced apart from one another along a circumferential direction with respect to a rotation center of the hub, and a shroud extending along a circumferential direction with respect to the rotation center of the hub and covering the blades, the shroud including a flow passage, the flow passage formed to be concave with respect to an inner surface facing the blades, and a plurality of resonators arranged in the flow passage.
- Each of the plurality of resonators may include an opening opened in a surface of the flow passage facing the plurality of blades and a space portion connected to the opening and extending outwardly from the opening, forming a hollow space in the shroud.
- the fluid machine may further include a base arranged around the hub, extending along a circumferential direction with respect to the rotation center of the hub and supporting the plurality of blades.
- the shroud may include an inlet that guides an inflow of fluid toward the plurality of blades and an outlet that guides discharge of the fluid that has passed through the plurality of blades.
- the flow passage may extend from the inlet toward the outlet and may be formed in at least a partial section of the inner surface of the shroud.
- the plurality of resonators may be arranged in the flow passage with a uniform density in an entire area of the flow passage from the inlet of the shroud to the outlet.
- a density of the plurality of resonators arranged in the flow passage may increase from the inlet of the shroud toward the outlet.
- the plurality of resonators may be arranged only in a partial area of an entire area of the flow passage from the inlet of the shroud toward the outlet.
- the plurality of resonators may be arranged in an area of the flow passage located at a distance from the inlet of the shroud determined by a preset distance from the inlet of the shroud toward the outlet.
- the shroud may include a first plate arranged at a position contacting the plurality of blades and including the flow passage and the opening of each of the plurality of resonators, and a second plate arranged above the first plate and including the space portion of each of the plurality of resonators at a position corresponding to the opening of each of the plurality of resonators.
- a fluid machine may include a rotatable hub; a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud may include: a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and a plurality of resonators provided in the flow passage.
- Each of the plurality of resonators may include: an opening portion provided on a surface of the flow passage facing the plurality of blades; and a space portion connected to the opening and extending radially from the opening portion, the space portion forming a hollow space in the shroud.
- the fluid machine may further include a base arranged around the hub, extending along a circumferential direction with respect to the rotation center of the hub and supporting the plurality of blades.
- the shroud may include: an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades.
- the flow passage may extend from the inlet portion toward the outlet portion and is formed in at least a partial section of the inner surface of the shroud.
- the plurality of resonators may be arranged in the flow passage with a uniform density in an entire area of the flow passage from the inlet portion of the shroud to the outlet portion.
- a density of the plurality of resonators arranged in the flow passage may increase from the inlet portion of the shroud toward the outlet portion.
- the plurality of resonators may be arranged only in a partial area of an entire area of the flow passage.
- the plurality of resonators may be arranged in an area of the flow passage located at a distance from the inlet portion of the shroud determined by a preset distance from the inlet portion of the shroud toward the outlet.
- the shroud may include: a first plate arranged at a position contacting the plurality of blades and including the flow passage and the opening portion of each of the plurality of resonators; and a second plate provided on the first plate and including the space portion of each of the plurality of resonators at a position corresponding to the opening portion of each of the plurality of resonators.
- a fluid machine may include: a rotatable hub; a base connected to the hub and extending radially from the hub; a plurality of blades provided on the base and spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud including: an inner surface facing the base and contacting the plurality of blades; a flow passage formed to be recessed with respect to the inner surface of the shroud facing the base; and a plurality of resonators provided in the flow passage.
- the shroud may include: an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades.
- the flow passage may include: a first region in which the plurality of resonators are arranged; and a second region in which none of the plurality of resonators are provided in the flow passage.
- FIG. 1 is a perspective view of a structure of a fluid machine according to an exemplary embodiment, in which constituent elements are disassembled from each other;
- FIG. 2 is a perspective view illustrating an assembled state of the fluid machine of FIG. 1 ;
- FIG. 3 is a cross-sectional view taken along a line III-III of the fluid machine of FIG. 2 ;
- FIG. 4 is an enlarged cross-sectional view of a portion IV of the fluid machine of FIG. 3 ;
- FIG. 5 is a cross-sectional view taken along a line V-V of the fluid machine of FIG. 2 ;
- FIG. 6 is a plan view of the fluid machine of FIG. 2 ;
- FIG. 7 is an enlarged view of a portion of a shroud of the fluid machine of FIG. 1 ;
- FIG. 8 is an enlarged view of a portion of a shroud of a fluid machine according to an exemplary embodiment
- FIG. 9 is an enlarged view of a portion of a shroud of a fluid machine according to an exemplary embodiment
- FIG. 10 is a cross-sectional view of a shroud to illustrate a process of manufacturing the shrouds of the fluid machines of FIGS. 1 to 9 ;
- FIG. 11 is a cross-sectional view of a shroud to illustrate a process of manufacturing the shrouds of the fluid machines of FIGS. 1 to 9 ;
- FIG. 12 is a cross-sectional view of the shroud manufactured by the process of FIG. 11 ;
- FIG. 13 is an enlarged view of a portion of a shroud of a fluid machine according to an exemplary embodiment.
- FIG. 1 is a perspective view of a structure of a fluid machine 100 according to an exemplary embodiment, in which constituent elements are disassembled from each other.
- FIG. 2 is a perspective view illustrating an assembled state of the fluid machine 100 of FIG. 1 .
- FIG. 3 is a cross-sectional view taken along a line III-III of the fluid machine 100 of FIG. 2 .
- the fluid machine 100 may include a hub 10 , a plurality of blades 21 arranged on and around the hub 10 , and a shroud 30 arranged to cover the blades 21 .
- a rotating machine may be any apparatus capable of changing the pressure and velocity of fluid by a rotation motion of an impeller.
- a rotating machine according to the exemplary embodiment may be implemented by an expander (turbine) for expanding fluid, a pump, or a blower.
- the hub 10 has a cylindrical shape and has a shaft coupling hole 10 a , in which a rotation shaft may be inserted.
- a base 22 is arranged around the hub 10 . Outer diameter of the base 22 increases along a vertical direction of the center of the hub 10 from the top to the bottom of the base 22 .
- the base 22 extends in a circumferential direction with respect to the center of the hub 10 .
- the base 22 is coupled to an outer surface of the hub 10 and the outer diameter of the base 22 increases along a vertical direction of the center of the hub 10 from the top to the bottom of the base 22 . Because a surface of the base 22 is an inclined curved surface, the surface of the base 22 forming a bottom surface of a passage for passing fluid is designed to enable a smooth flow of the fluid and to transfer maximum energy to the fluid.
- the blades 21 are arranged around the hub 10 to be spaced apart from one another in a preset interval in a circumferential direction with respect to a rotation center of the hub 10 .
- the blades 21 may be arranged on an upper surface of the base 22 and, as the base 22 is coupled to the outer surface of the hub 10 , the blades 21 may be arranged circumferentially around the hub 10 .
- the blades 21 extend outwardly from the hub 10 in the radial direction of the hub 10 .
- An impeller 20 including the hub 10 , the blades 21 , and the base 22 guides a flow of fluid while simultaneously transferring dynamic energy of the impeller 20 to the fluid.
- the shroud 30 has an inlet 38 for the fluid formed at an open upper end portion thereof and an outlet 39 for the fluid radially and downwardly extending from the inlet 38 at the open upper end portion.
- the shroud 30 forms a ceiling surface of the passage of the fluid.
- the shroud 30 forms the passage of the fluid with the base 22 and the blades 21 .
- the inlet 38 may be manufactured to function as an outlet, whereas the outlet 39 may be manufactured to function as an inlet.
- the inlet 38 of the shroud 30 guides the fluid to be input toward the blades 21 . Furthermore, the outlet 39 of the shroud 30 guides the fluid moved by the blades 21 to be discharged to the outside of the shroud 30 .
- the shroud 30 extends radially from the hub 10 and also extends in a circumferential direction with respect to the rotation center of the hub 10 and is arranged covering upper end portions of the blades 21 as shown in FIG. 2 .
- the shroud 30 and the blades 21 may be fixed to each other, for example, by a welding process or by using a coupling device such as rivets or bolts. When the shroud 30 and the blades 21 are fixed to each other, the hub 10 , the blades 21 , and the shroud 30 may rotate together.
- the shroud 30 may be fixed on an external structure instead of the blades 21 .
- the shroud 30 maintains the fixed position relative to the hub 10 and the blades 21 during the rotation of the hub 10 and the blades 21 , thereby forming part of the passage.
- the impeller 20 When the impeller 20 performs a rotation motion, the fluid incoming through the inlet 38 of the shroud 30 is discharged to the outside through the outlet 39 of the shroud 30 by a centrifugal force. In other words, the fluid is compressed to a high-pressure state and discharged through the outlet 39 by the centrifugal force according to rotational dynamic energy of the impeller 20 . While the fluid passes through a diffuser (not shown), for example, the velocity of the fluid discharged to the outside of the impeller 20 through the outlet 39 decreases and simultaneously the pressure of the fluid increases to a requested level.
- the shroud 30 may include a flow passage (or a flow passage surface; hereinafter “a flow passage”) 32 formed to be recessed (or sunken) with respect to an inner surface 30 a facing the blades 21 as FIG. 1 (and FIG. 4 ).
- the flow passage 32 radially extends from the inlet 38 of the shroud 30 toward the outlet 39 .
- the shroud 30 may also include a plurality of resonators 40 arranged in the flow passage 32 .
- the flow passage 32 formed in the shroud 30 guides a flow of the fluid that is moved and compressed by the rotation motion of the blades 21 , thereby enabling the fluid to move smoothly.
- the flow passage 32 radially extends from the hub 10 toward the outside in a direction in which the blades 21 are formed, and is formed to be curved in the circumferential direction. As such, aerodynamic loss of the fluid passing between the shroud 30 and the blades 21 may be reduced by the structure of the flow passage 32 formed in the shroud 30 .
- FIG. 4 is an enlarged cross-sectional view of a portion IV of the fluid machine 100 of FIG. 3 .
- FIG. 5 is a cross-sectional view taken along a line V-V of the fluid machine 100 of FIG. 2 .
- FIG. 6 is a plan view of the fluid machine 100 of FIG. 2 .
- Each of the plurality of resonators 40 may include an opening 41 (or an opening portion) opened in a surface of the flow passage 32 facing the blades 21 and a space portion 42 connected to the opening 41 and extending from the opening 41 to the outside, thereby forming an hollow space in the shroud 30 .
- Each of the opening 41 and the space portion 42 may have a circular or polygonal cross-section. Furthermore, the size of a cross-section of the space portion 42 is larger than the size of a cross-section of the opening 41 as shown in FIG. 4 .
- the resonators 40 are formed on the surface of the flow passage 32 that guides the flow of the fluid so that the fluid smoothly flows between the blades 21 and the shroud 30 , noise that may be generated by air compressed at high pressure between the blades 21 and the shroud 30 may be reduced.
- a sectional area, a size, and an arrangement position of the opening 41 and the space portion 42 of each of the resonators 40 are designed according to a frequency of noise generated between the shroud 30 and the blades 21 .
- values such as the length and the sectional area of the opening 41 formed from the surface of the flow passage 32 to the space portion 42 , and the volume of the space portion 42 may be experimentally designed according to a resonance frequency that may be generated between the shroud 30 and the blades 21 .
- FIG. 7 is an enlarged view of a portion of a shroud of the fluid machine 100 of FIG. 1 .
- the flow passage 32 formed in the shroud 30 is formed on an inner surface of in the shroud 30 (facing the base 22 ) and extends from the inlet 38 toward the outlet 39 .
- the flow passage 32 is formed in the entire section of the inner surface of the shroud 30 from the inlet 38 of the shroud 30 toward the outlet 39
- the length of the flow passage 32 is not limited thereto.
- the flow passage 32 may be formed only in a partial section of the inner surface of the shroud 30 from the inlet 38 of the shroud 30 toward the outlet 39 .
- the resonators 40 are arranged such that the resonators 40 have the uniform density in the entire area of the flow passage 32 from the inlet 38 of the shroud 30 toward the outlet 39 . Accordingly, as illustrated in FIG. 7 , a distance d between the resonators 40 arranged adjacent to the inlet 38 is the same as a distance d between the resonators 40 arranged adjacent to the outlet 39 . Accordingly, a noise reduction effect of the same level may be obtained with respect to the entire area of the flow passage 32 from the inlet 38 of the shroud 30 toward the outlet 39 .
- FIG. 8 is an enlarged view of a portion of a shroud 130 of a fluid machine 100 according to an exemplary embodiment.
- the shroud 130 of a fluid machine 100 has a similar structure to the structure of the shroud 30 of FIG. 7 , except for the arrangement density of a plurality of resonators 140 .
- the arrangement density of the resonators 140 varies in the entire area from an inlet 138 of the shroud 130 toward an outlet 139 .
- the density of the resonators 140 arranged in the flow passage 132 increases from the inlet 138 of the shroud 130 toward the outlet 139 .
- a distance d 2 between the resonators 140 arranged adjacent to the outlet 139 is less than a distance d 1 between the resonators 140 arranged adjacent to the inlet 138 . Accordingly, the noise reduction effect of the resonators 140 is higher at the outlet 139 than the inlet 138 of the shroud 130 . As such, a structure in which the density of the resonators 140 arranged adjacent to the outlet 139 is higher than the density of the resonators 140 arranged adjacent to the inlet 138 may be applied to a case in which the noise generated at the outlet 139 is greater than the noise generated at the inlet 138 .
- FIG. 9 is an enlarged view of a portion of a shroud 230 of a fluid machine 100 according to an exemplary embodiment.
- the shroud 230 of a fluid machine 100 has a similar structure to the structure of the shroud 30 of FIG. 7 , except for the arrangement position of a plurality of resonators 240 .
- the resonators 240 are arranged only in a partial area of the entire area of a flow passage 232 from an inlet 238 of the shroud 230 to an outlet 239 .
- the resonators 240 are arranged in an area of the flow passage 232 located at a distance from the inlet 238 of the shroud 230 determined by a preset distance d 0 from the inlet 238 of the shroud 230 toward the outlet 239 .
- the density at which the resonators 240 are arranged in the flow passage 232 may be set to be uniform in the entire area of the flow passage 232 .
- a distance d 3 between the resonators 240 adjacent to the inlet 238 is the same as a distance d 4 between the resonators 240 adjacent to the outlet 239 .
- the present disclosure is not limited to the structure in which the density of the resonators 240 arranged in the flow passage 232 is uniform in the entire area of the flow passage 232 as illustrated in FIG. 9 .
- the distance d 3 between the resonators 240 adjacent to the inlet 238 may be designed to be different from the distance d 4 between the resonators 240 adjacent to the outlet 239 , by modifying the arrangement of the resonators 240 illustrated in FIG. 9 .
- the noise reduction effect may be increased by arranging the resonators 240 in an area of the flow passage 232 located at a distance from the inlet 238 of the shroud 230 determined by the preset distance d 0 from the inlet 238 of the shroud 230 toward the outlet 239 , the area corresponding to an area of the entire area of the flow passage 232 in which noise is much increased.
- the sizes, that is, the diameter, the length, and the volume of the opening, and the volume of the space portion, of the resonators formed in the shroud are described as being constant, the sizes of the resonators may be changed according to the positions of the resonators arranged in the flow passage of the shroud.
- the sizes of the openings and the space portions of the resonators arranged adjacent to the inlet of the shroud may be designed to be relatively small, whereas the sizes of the openings and the space portions of the resonators arranged adjacent to the outlet of the shroud may be designed to be relatively large.
- the sizes of the resonators may be modified to be gradually increased or decreased from the inlet of the shroud toward the outlet.
- FIG. 10 is a cross-sectional view of a shroud to illustrate a process of manufacturing the shrouds of the fluid machines of FIGS. 1 to 9 .
- FIG. 10 illustrates an example of a process of manufacturing a shroud 330 of a fluid machine using a mold.
- the shroud 330 having a flow passage 332 formed to be recessed (or sunken) in one surface thereof is completed.
- the resonators 340 which include an opening 341 in a surface of the flow passage 332 and a space portion 342 extending from the opening 341 to the outside and forming an inner space in the shroud 330 , are formed in a surface of the flow passage 332 of the shroud 330 .
- the upper mold 7 and the lower mold 8 are removed after the shroud 330 is cured, and the surface of the shroud 330 is washed out, thereby completing the manufacture of the shroud 330 .
- FIG. 11 is a cross-sectional view of a shroud to illustrate a process of manufacturing the shrouds of the fluid machines of FIGS. 1 to 9 .
- FIG. 12 is a cross-sectional view of the shroud manufactured by the process of FIG. 11 .
- FIGS. 11 and 12 illustrate an example of a process of manufacturing a shroud 430 of a fluid machine 100 by a method of combining two metal plates.
- the process of manufacturing a shroud 430 may include preparing a first plate 430 a , preparing a second plate 430 b , and bonding the first plate 430 a and the second plate 430 b.
- the first plate 430 a is a constituent element forming an inner surface of the shroud 430 contacting a blade.
- the preparing of the first plate 430 a may include an operation of, for example, forming an opening 441 and a flow passage 432 by preparing a metal plate and applying at least one of various processing methods such as punching, hammering, pressing, and bending, to the metal plate.
- the second plate 430 b is a constituent element forming an outer surface of the shroud 430 opposite to the inner surface contacting the blade.
- the preparing of the second plate 430 b may include an operation of, for example, forming a space portion 442 by preparing a metal plate and applying at least one of various processing methods such as punching, hammering, pressing, and bending, to the metal plate.
- the positions of the first plate 430 a and the second plate 430 b are aligned to each other such that the opening 441 of the first plate 430 a and the space portion 442 of the second plate 430 b correspond to each other, and the first plate 430 a and the second plate 430 b are bonded to each other.
- the first plate 430 a and the second plate 430 b may be bonded to each other by various methods, for example, coating an adhesive between the first plate 430 a and the second plate 430 b , using a coupling device such as rivets or bolts penetrating through the first plate 430 a and the second plate 430 b , or welding edges of inner sides of the first plate 430 a and the second plate 430 b.
- the manufacture of the shroud 430 is arranged at a position contacting the blade and may include the first plate 430 a having the flow passage 432 and the opening 441 , and the second plate 430 b having the space portion 442 at a position corresponding to the opening 441 .
- the opening 441 of the first plate 430 a and the space portion 442 of the second plate 430 b are connected to each other so that a plurality of resonators 440 are formed.
- FIG. 13 is an enlarged view of a portion of a shroud 530 of a fluid machine 100 according to an exemplary embodiment.
- the shroud 530 may include a first plate 530 a having a flow passage 532 formed on an inner surface thereof and a second plate 530 b manufactured to have an outer shape corresponding to the flow passage 532 and having a plurality of holes 535 of a hexagonal shape having a beehive arrangement.
- the shroud 530 is thus completed, and the holes 535 having a hexagonal shape and a beehive arrangement are arranged on a surface of the flow passage 532 of the shroud 530 facing blades.
- the shroud 530 having the above structure, because the holes 535 in a beehive arrangement are provided on the flow passage 532 that smoothly guides a flow of fluid, a reduction in aerodynamic loss and a noise reduction effect may be obtained simultaneously.
- aerodynamic loss of fluid passing between the shroud and the blades may be reduced due to the structure of the flow passage formed in the shroud.
- the resonators are arranged in the surface of the flow passage that guides the flow of fluid so that the fluid may smoothly flows between the blades and the shroud, noise that may be generated between the blades and the shroud by air compressed at high pressure may be reduced.
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Abstract
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Claims (11)
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KR1020160012899A KR102488570B1 (en) | 2016-02-02 | 2016-02-02 | Fluid machine |
KR10-2016-0012899 | 2016-02-02 |
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US20170218979A1 US20170218979A1 (en) | 2017-08-03 |
US10385877B2 true US10385877B2 (en) | 2019-08-20 |
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RU2651911C1 (en) * | 2017-08-15 | 2018-04-24 | Алексей Юрьевич Криштафович | Centrifugal pump |
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US20220325720A1 (en) * | 2019-12-09 | 2022-10-13 | Danfoss A/S | Compressor shrouded impeller arrangement |
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Also Published As
Publication number | Publication date |
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KR102488570B1 (en) | 2023-01-13 |
US20170218979A1 (en) | 2017-08-03 |
KR20170091953A (en) | 2017-08-10 |
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