WO2023181193A1 - 羽根車および送風機 - Google Patents

羽根車および送風機 Download PDF

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Publication number
WO2023181193A1
WO2023181193A1 PCT/JP2022/013588 JP2022013588W WO2023181193A1 WO 2023181193 A1 WO2023181193 A1 WO 2023181193A1 JP 2022013588 W JP2022013588 W JP 2022013588W WO 2023181193 A1 WO2023181193 A1 WO 2023181193A1
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WO
WIPO (PCT)
Prior art keywords
main plate
shaft
fixing member
axial direction
contact
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/JP2022/013588
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English (en)
French (fr)
Japanese (ja)
Inventor
一輝 岡本
勇児 秋場
和真 宮本
友祐 澤野
周平 横山
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 Electric Corp
Original Assignee
Mitsubishi Electric 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 Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2024509534A priority Critical patent/JP7599614B2/ja
Priority to PCT/JP2022/013588 priority patent/WO2023181193A1/ja
Publication of WO2023181193A1 publication Critical patent/WO2023181193A1/ja
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

Definitions

  • the present disclosure relates to an impeller including a main plate and a plurality of blades, and a blower including the impeller.
  • the impeller of the blower includes a main plate that rotates as the motor rotates, and a plurality of blades that are spaced apart from each other along the outer periphery of the main plate.
  • the main plate is attached to the motor shaft.
  • the direction parallel to the shaft of the motor will be referred to as the axial direction.
  • the axial position of the main plate on the shaft is fixed using a fixing member such as a washer that is passed through the motor shaft.
  • the present disclosure has been made in view of the above, and aims to provide an impeller that can reduce resonance without using a damping material.
  • an impeller includes a main plate having a main plate insertion hole into which a shaft is inserted, and a main plate provided at intervals along the outer periphery of the main plate. and a plurality of wings extending in the axial direction of the shaft.
  • a contact part provided at a position away from the main plate insertion hole in the radial direction, which is a direction perpendicular to the axial direction, and a contact part provided from the main plate insertion hole to the contact part.
  • a separation part is provided and located on the other side of the contact part along the axial direction.
  • the impeller according to the present disclosure has the effect that resonance can be reduced without using a damping material.
  • a perspective view showing a blower according to Embodiment 1 A cross-sectional view taken along the line II-II shown in Figure 1.
  • a perspective view showing an impeller according to Embodiment 1 A perspective view showing a motor and a fixing member according to Embodiment 1 2 is a cross-sectional view showing a blower according to a comparative example, and corresponds to a cross-sectional view taken along the line II-II shown in FIG. 1.
  • a perspective view showing an impeller according to a comparative example FIG. 2 is a perspective view showing a blower according to a second embodiment, and a perspective view showing a motor and a fixing member according to the second embodiment.
  • FIG. 2 is a cross-sectional view showing the blower according to the second embodiment, and corresponds to the cross-sectional view taken along the line II-II shown in FIG. 1.
  • a perspective view showing a fixing member according to a modification of the second embodiment 2 is a cross-sectional view showing the blower according to Embodiment 3, and corresponds to the cross-sectional view taken along the line II-II shown in FIG. 1.
  • this is a graph showing the relationship between the amount of deformation in the circumferential direction of the impeller and the natural frequency when the radial dimension of the fixed member is changed, and is a graph based on frequency response analysis.
  • 2 is a sectional view showing a blower according to Modification 1 of Embodiment 3, and corresponds to a sectional view taken along line II-II shown in FIG. 1.
  • a perspective view showing an impeller according to Modification 1 of Embodiment 3 2 is a cross-sectional view showing a blower according to a second modification of the third embodiment, and corresponds to a cross-sectional view taken along the line II-II shown in FIG. 1.
  • FIG. 2 is a sectional view showing the blower according to Embodiment 4, and corresponds to the sectional view taken along the line II-II shown in FIG. 1.
  • a perspective view showing an impeller according to Embodiment 4 A perspective view showing an impeller according to Modification 1 of Embodiment 4
  • FIG. 1 is a perspective view showing a blower 1 according to the first embodiment.
  • FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.
  • the outer appearance of the housing 2b is shown instead of a cross section for the sake of simplification.
  • the blower 1 includes a motor 2, an impeller 3, a fixing member 4, and a casing 5.
  • the motor 2 has a shaft 2a and a housing 2b.
  • the shaft 2a is formed into a cylindrical shape having a central axis C.
  • the axial direction is the axial direction of the shaft 2a of the motor 2.
  • the radial direction is a direction perpendicular to the axial direction.
  • the circumferential direction is the rotation direction of the shaft 2a.
  • the direction from the shaft 2a toward the housing 2b along the axial direction is defined as one side along the axial direction, and the side opposite to the one along the axial direction is defined as the other side along the axial direction.
  • the axial direction may coincide with the vertical direction, may coincide with the horizontal direction, or may intersect obliquely with respect to the vertical direction and the horizontal direction.
  • the casing 5 is a member that houses the impeller 3.
  • the casing 5 rectifies the airflow generated by the rotation of the impeller 3.
  • the casing 5 has a pair of casing side walls 5a, a casing peripheral wall 5b, and an air outlet 5c.
  • the pair of casing side walls 5a cover the impeller 3 from the axial direction.
  • the pair of casing side wall portions 5a are separated from each other in the axial direction.
  • the impeller 3 is arranged between the pair of casing side walls 5a.
  • a suction port 5d for sucking air into the casing 5 is formed in one of the casing side walls 5a.
  • a fixing hole 5e to which the motor 2 is attached is formed in the other casing side wall portion 5a.
  • the other casing side wall portion 5a serves as a fixing wall for fixing the motor 2.
  • the casing peripheral wall portion 5b covers the impeller 3 from the radial direction.
  • the air outlet 5c is a part for blowing out the airflow generated by the impeller 3 to the outside of the casing 5.
  • the air outlet 5c is formed by extending a part of the casing peripheral wall part 5b and a part of the casing side wall part 5a outward in the radial direction.
  • the casing peripheral wall portion 5b is not provided in the portion of the casing 5 where the air outlet 5c is formed.
  • the motor 2 is a member that rotates an impeller 3 disposed within the casing 5.
  • the housing 2b is a metal member that forms the outer shell of the motor 2.
  • the housing 2b accommodates a stator, a rotor, and the like in addition to a portion of the shaft 2a.
  • a flange portion 2c extending radially outward is formed on the outer peripheral surface of the housing 2b.
  • the housing 2b is inserted into the fixing hole 5e of the casing 5, and is installed across the inside and outside of the casing 5.
  • the flange portion 2c of the housing 2b and the casing side wall portion 5a are superimposed on each other and fixed with bolts or the like (not shown).
  • the suction port 5d and the fixing hole 5e are separated from each other in the axial direction.
  • the remainder of the shaft 2a protrudes to the outside of the housing 2b.
  • a main plate 6 of the impeller 3, which will be described later, is attached to a portion of the shaft 2a located outside the housing 2b. The main plate 6 rotates as the shaft 2a rotates.
  • the impeller 3 is a member that is rotated by the motor 2 with the central axis C as a rotation axis. As the impeller 3 rotates, air sucked in from the suction port 5d becomes an airflow and is blown out of the casing 5 from the blowout port 5c.
  • the impeller 3 is made of, for example, metal or resin.
  • FIG. 3 is a perspective view showing the impeller 3 according to the first embodiment.
  • the impeller 3 includes a main plate 6, a plurality of blades 7, and a reinforcing ring 8.
  • the main plate 6 has a circular shape when viewed along the axial direction.
  • the plurality of wings 7 are provided along the outer peripheral edge of the main plate 6 at intervals.
  • Each of the plurality of blades 7 extends in the axial direction.
  • the reinforcing ring 8 has an annular shape when viewed along the axial direction.
  • the reinforcing ring 8 is provided at a position apart from the main plate 6 in the axial direction.
  • the reinforcing ring 8 surrounds the plurality of wings 7.
  • the fixing member 4 is a member that is attached to the shaft 2a between the main plate 6 and the housing 2b, contacts the main plate 6, and fixes the axial position of the impeller 3.
  • the fixing member 4 is made of, for example, metal or resin.
  • the fixing member 4 is, for example, a washer.
  • FIG. 4 is a perspective view showing the motor 2 and fixing member 4 according to the first embodiment.
  • the shape of the fixing member 4 when viewed along the axial direction is circular.
  • a fixed insertion hole 4a through which the shaft 2a is inserted is formed in the center of the fixed member 4.
  • the fixed member 4 has a first fixed shaft end surface 4b and a second fixed shaft end surface 4c.
  • the first fixed shaft end surface 4b is a surface of the fixed member 4 that faces the other side along the axial direction.
  • the second fixed shaft end surface 4c is a surface facing one side of the fixed member 4 along the axial direction.
  • the main plate 6 has a main plate bottom wall part 6a, a main plate side wall part 6b, and a main plate peripheral wall part 6c.
  • the main plate bottom wall portion 6a extends in the radial direction.
  • the main plate bottom wall portion 6a has a circular shape when viewed along the axial direction.
  • a boss portion 6d that is thicker in the axial direction than other portions is formed at the center of the main plate bottom wall portion 6a.
  • a main plate insertion hole 6e through which the shaft 2a is inserted is formed in the boss portion 6d. The main plate insertion hole 6e is formed to penetrate the main plate bottom wall portion 6a in the axial direction.
  • the main plate side wall portion 6b extends from the outer peripheral edge of the main plate bottom wall portion 6a toward the housing 2b, and reaches the radially outer side of the housing 2b.
  • the main plate side wall portion 6b is spaced apart from the housing 2b in the radial direction.
  • the main plate side wall portion 6b is formed in a tapered shape whose diameter increases from the outer peripheral edge of the main plate bottom wall portion 6a toward the housing 2b.
  • the main plate peripheral wall portion 6c extends radially outward from the tip edge of the main plate side wall portion 6b.
  • the main plate peripheral wall portion 6c has an annular shape when viewed along the axial direction.
  • the main plate bottom wall portion 6a has a main plate shaft end face 6f facing toward the fixing member 4.
  • the main plate axial end surface 6f is a surface facing one side of the main plate 6 along the axial direction.
  • a contact portion 6g and a separation portion 6h are formed on the main plate shaft end surface 6f.
  • the contact portion 6g is provided at a position apart from the shaft 2a in the radial direction and contacts the fixing member 4.
  • the contact portion 6g is an annular plane.
  • the separating portion 6h is provided from the shaft 2a to the contact portion 6g, and is separated from the fixing member 4 while the contact portion 6g is in contact with the fixing member 4.
  • the separating portion 6h is provided from the edge of the portion of the main plate insertion hole 6e that opens to the main plate shaft end face 6f to a plane that becomes the contact portion 6g.
  • the separation part 6h is located on the other side of the contact part 6g along the axial direction.
  • the separation part 6h is located on the side farther away from the housing 2b than the contact part 6g.
  • the separating portion 6h is an annular recessed portion recessed from one side toward the other along the axial direction.
  • the vibrations generated in the impeller 3 are mainly axial vibrations of shaft vibrations and torsional vibrations in the circumferential direction. Since the main plate 6 holds a plurality of blades 7 and the plurality of blades 7 are provided on the outer peripheral edge of the main plate 6 and the outer peripheral edge of the main plate 6 has a heavy mass, the main plate 6 is an impeller. 3. It has a large effect on the overall vibration.
  • the natural frequency of the impeller 3 can be changed by changing the location of the main plate 6 that contacts the fixed member 4, which affects this vibration.
  • the main plate shaft end surface 6f includes a contact portion 6g that is provided at a position radially away from the main plate insertion hole 6e and contacts the fixing member 4, and a contact portion 6g extending from the main plate insertion hole 6e to the contact portion 6g.
  • a separating part 6h is formed so that the contact part 6g is separated from the fixing member 4 while being in contact with the fixing member 4.
  • the natural frequency of the impeller 3 can be changed so as to deviate from the resonant frequency.
  • the impeller 3's characteristic The frequency can be removed from the resonant frequency. Therefore, the resonance in the blower 1 can be avoided or the resonance in the blower 1 can be reduced without using a damping material.
  • the amplitude of vibration of the impeller 3 can be changed.
  • the contact point between the main plate 6 and the fixing member 4 can be brought close to a large area. Thereby, the vibration of the impeller 3 can be suppressed from becoming dominant.
  • FIG. 5 is a cross-sectional view showing the blower 10 according to the comparative example, and corresponds to the cross-sectional view taken along the line II-II shown in FIG. 1.
  • FIG. 6 is a perspective view showing an impeller 3 according to a comparative example.
  • the main plate shaft end surface 6f does not have the separation part 6h, and the main plate shaft end surface 6f and the first fixed shaft end surface 4b are apparently flat.
  • the location where the main plate 6 and the fixed member 4 come into contact changes depending on the flatness of the main plate shaft end surface 6f and the first fixed shaft end surface 4b.
  • the shortest distance in the radial direction from the central axis C of the shaft 2a to the point where the main plate 6 and the fixed member 4 contact is not clearly determined. Therefore, since the natural frequency of the impeller 3 changes depending on the flatness of the main plate shaft end surface 6f and the first fixed shaft end surface 4b, the location where the electromagnetic vibration of the motor 2 is propagated to the impeller 3 is intentionally changed. It is difficult to intentionally change the natural frequency of the impeller 3.
  • a separation part 6h is formed on the main plate shaft end face 6f radially inward from the contact part 6g, so that the main plate 6 and the fixing member 4 can be connected to each other.
  • the main plate 6 and the fixing member 4 are reliably separated from each other on the radially inner side of the point where they contact each other. Therefore, the shortest distance L in the radial direction from the central axis C of the shaft 2a to the point where the main plate 6 and the fixed member 4 contact is clearly determined. Therefore, by intentionally changing the location where the electromagnetic vibrations of the motor 2 propagate to the impeller 3, the natural frequency of the impeller 3 can be intentionally changed.
  • the radially innermost location of the contact points between the main plate 6 and the fixing member 4 be sufficiently spaced radially outward from the central axis C of the shaft 2a.
  • the radius of the shaft 2a is R
  • the relationship L ⁇ 2 ⁇ R holds true. That is, of the locations where the main plate 6 and the fixing member 4 come into contact, it is desirable that the radially innermost location be located at least twice the radius R of the shaft 2a from the central axis C of the shaft 2a.
  • one of the main plate shaft end surface 6f and the fixing member 4 is provided at a position away from the shaft 2a in the radial direction, which is a direction perpendicular to the axial direction. It is only necessary that a contact portion 6g that contacts one or the other is formed. Further, either one of the main plate shaft end surface 6f and the fixing member 4 is provided extending from the shaft 2a to the contact portion 6g, so that the contact portion 6g contacts the other of the main plate shaft end surface 6f and the fixing member 4. It is only necessary that a separating portion 6h be formed to be separated from the other of the main plate shaft end surface 6f and the fixing member 4 in this state.
  • FIG. 7 is a perspective view showing the blower 1A according to the second embodiment, and is a perspective view showing the motor 2 and the fixing member 4 according to the second embodiment.
  • FIG. 8 is a cross-sectional view showing the blower 1A according to the second embodiment, and corresponds to the cross-sectional view taken along the line II-II shown in FIG.
  • the first fixed shaft end surface 4b is the surface of the fixed member 4 that faces the other side along the axial direction
  • the second fixed shaft end surface 4c is the surface of the fixed member 4 that faces the other side along the axial direction. This is the surface facing one side along the axial direction.
  • a plurality of contact portions 4d and a separation portion 4e are formed on the first fixed shaft end surface 4b.
  • the second fixed shaft end surface 4c is a plane extending in the radial direction.
  • the first fixed shaft end surface 4b and the second fixed shaft end surface 4c have an asymmetrical shape. That is, the shape of the fixing member 4 is not symmetrical between the front and the back.
  • the contact portion 4d is a protrusion portion 4f that protrudes toward the main plate shaft end surface 6f in this embodiment.
  • the protrusions 4f are provided at positions separated from the shaft 2a in the radial direction and spaced apart from each other along the circumferential direction.
  • the protruding portion 4f has a convex shape on the main plate shaft end face 6f side and a concave shape on the housing 2b side.
  • the protrusion 4f is provided by locally bending the fixing member 4 without changing the overall plate thickness of the fixing member 4. It may be provided. As shown in FIG.
  • the protruding portion 4f is formed in a truncated conical shape whose diameter decreases as it moves away from the first fixed shaft end surface 4b in the axial direction.
  • the tip of the protrusion 4f is a flat surface extending in the radial direction.
  • the number of protrusions 4f is eight in this embodiment. The eight protrusions 4f are arranged on the same circumference centered on the central axis C.
  • the separating portion 4e is provided extending from the shaft 2a to the protruding portion 4f.
  • the separating portion 4e is separated from the main plate shaft end surface 6f with the protruding portion 4f in contact with the main plate shaft end surface 6f.
  • the separating portion 4e is a plane extending in the radial direction.
  • the separating portion 4e is provided from the edge of the portion of the fixed insertion hole 4a that opens to the first fixed shaft end surface 4b to the protruding portion 4f.
  • the fixing member 4 may be manufactured by providing a protrusion 4f on a metal plate such as a flat washer, or may be manufactured from a resin material.
  • This embodiment also provides the same effects as the first embodiment described above.
  • a contact portion 4d and a separation portion 4e are formed on the first fixed shaft end surface 4b, and the second fixed shaft end surface 4c is a plane extending in the radial direction.
  • the fixing member 4 is attached to the shaft 2a so that the first fixed shaft end surface 4b faces the main plate shaft end surface 6f, or the second fixed shaft end surface 4c faces the main plate shaft end surface 6f.
  • the fixing member 4 By simply attaching the fixing member 4 to the shaft 2a, the shortest distance L in the radial direction from the central axis C of the shaft 2a to the point where the main plate 6 and the fixing member 4 contact can be changed. Therefore, the natural frequency of the impeller 3 can be easily changed by simply changing the location where the electromagnetic vibration of the motor 2 is propagated to the impeller 3.
  • FIG. 8 shows a case where the fixing member 4 is attached to the shaft 2a so that the first fixed shaft end surface 4b faces the main plate shaft end surface 6f.
  • the fixing member 4 is attached to the shaft 2a so that the second fixed shaft end surface 4c faces the main plate shaft end surface 6f
  • the first fixed shaft end surface 4b is attached to one of the fixing members 4 along the axial direction.
  • the second fixed shaft end surface 4c becomes the surface of the fixed member 4 that faces the other side along the axial direction.
  • the shortest radial distance L from the central axis C of the shaft 2a to the point where the main plate shaft end face 6f and the protrusion 4f of the fixing member 4 come into contact can be increased in the radial direction. Can be expanded.
  • the radial dimension of the fixed member 4 must be large enough to fit inside the plurality of blades 7 in the radial direction. It is desirable to set the
  • the location where the main plate shaft end surface 6f and the protruding portion 4f of the fixing member 4 come into contact serves as a fulcrum around which the impeller 3 rotates. Therefore, in order to suppress the vibration of the impeller 3 and stabilize the rotation of the impeller 3, it is desirable that the main plate shaft end surface 6f and the protruding portion 4f of the fixing member 4 contact each other in their planes.
  • the fixing member 4 may have the configuration shown in FIG. 9.
  • FIG. 9 is a perspective view showing a fixing member 4 according to a modification of the second embodiment.
  • the contact portion 4d is an annular plane.
  • the contact portion 4d is provided at a position apart from the shaft 2a shown in FIG. 8 in the radial direction and contacts the main plate shaft end surface 6f.
  • the separating portion 4e is a step-like stepped portion that is provided from the shaft 2a to the flat contact portion 4d, and is spaced apart from the main plate shaft end surface 6f as it goes from the outer side to the inner side in the radial direction. Even in this case, the same effects as in the first and second embodiments described above can be achieved.
  • FIG. 10 is a cross-sectional view showing the blower 1B according to the third embodiment, and corresponds to the cross-sectional view taken along the line II-II shown in FIG.
  • FIG. 11 is a perspective view showing the impeller 3 according to the third embodiment.
  • the central portion of the main plate shaft end surface 6f in the radial direction is formed in a step-like shape that becomes further away from the housing 2b from the outer side toward the inner side in the radial direction.
  • the main plate shaft end surface 6f is provided with a plurality of annular flat surfaces 61 arranged concentrically around the shaft 2a, and a stepped surface 62 connecting adjacent flat surfaces 61.
  • the thickness of the main plate bottom wall part 6a is made thicker than the thickness of the main plate side wall part 6b and the main plate peripheral wall part 6c, and the thickness of the main plate bottom wall part 6a is partially changed.
  • a plane 61 is formed.
  • Each of the plurality of planes 61 extends in the radial direction. Although the number of planes 61 may be increased or decreased as appropriate, it is three in this embodiment. When distinguishing the three planes 61, they are referred to as a plane 61a, a plane 61b, and a plane 61c in order from the outside in the radial direction to the inside.
  • the stepped surface 62 extends in the axial direction.
  • the stepped surface 62 connects the inner peripheral edge of the adjacent flat surface 61 and the outer peripheral edge of the flat surface 61.
  • the number of stepped surfaces 62 is two in this embodiment.
  • the number of stepped surfaces 62 increases or decreases depending on the number of flat surfaces 61. When distinguishing the two stepped surfaces 62, they are referred to as a stepped surface 62a and a stepped surface 62b in order from the one closest to the housing 2b in the axial direction.
  • the stepped surface 62a connects the inner circumferential edge of the plane 61a and the outer circumferential edge of the plane 61b.
  • the stepped surface 62b connects the inner circumferential edge of the plane 61b and the outer circumferential edge of the plane 61c.
  • the step surface 62b is located radially inner than the step surface 62a.
  • the central axis C of the shaft 2a is the normal line and the plane passing through the housing 2b is the reference plane S
  • the axial distance D between the plane 61 and the reference plane S is Among them, the one located on the inner side in the radial direction is longer. Note that in FIG. 10, only the distance D in the axial direction between the plane 61a and the reference plane S is illustrated.
  • the fixing member 4 is in contact with the plane 61a in this embodiment, it may be in contact with the plane 61b. That is, by changing the radial dimension of the fixing member 4, it is possible to bring the fixing member 4 into contact with the plane 61a, and it is also possible to bring the fixing member 4 into contact with the plane 61b.
  • the flat surface 61a becomes the contact portion 6g
  • the portion of the main plate shaft end surface 6f that is radially inner than the flat surface 61a becomes the separation portion 6h.
  • the flat surface 61b becomes the contact portion 6g
  • the portion of the main plate shaft end surface 6f that is radially inner than the flat surface 61b becomes the separation portion 6h.
  • one of the plurality of planes 61a and 61b serves as the contact portion 6g.
  • the plurality of planes 61 provided on the main plate shaft end surface 6f are such that the inner side in the radial direction is further away from the casing 2b in the axial direction, and one of the plurality of planes 61 is located at the contact portion. It will be 6g.
  • the shortest distance L in the radial direction from the central axis C of the shaft 2a to the point where the main plate 6 and the fixing member 4 contact can be changed. Therefore, the natural frequency of the impeller 3 can be easily changed by simply changing the location where the electromagnetic vibration of the motor 2 is propagated to the impeller 3.
  • FIG. 12 is a graph showing the relationship between the amount of axial deformation of the impeller 3 and the natural frequency when the radial dimension of the fixed member 4 is changed in the blower 1B according to the third embodiment, This is a graph obtained by frequency response analysis.
  • FIG. 13 is a graph showing the relationship between the amount of deformation in the circumferential direction of the impeller 3 and the natural frequency when the radial dimension of the fixed member 4 is changed in the blower 1B according to the third embodiment, This is a graph obtained by frequency response analysis.
  • the frequency response analysis shown in FIGS. 12 and 13 was conducted under the conditions that the radial dimension of the impeller 3 in Embodiment 3 was 180 mm, and the axial dimension of the impeller 3 was 100 mm.
  • the impeller 3 has both an axial vibration mode that vibrates in the axial direction and a torsional vibration mode that vibrates torsionally in the circumferential direction, and the amplitude becomes large at the natural frequency. I understand that. It can also be seen that by changing the radial dimension of the fixed member 4, the natural frequency of the impeller 3 can be changed.
  • the radial dimension of the fixed member 4 is as follows. It is desirable to have a size that fits inside the plurality of blades 7 in the radial direction.
  • FIG. 14 is a cross-sectional view showing a blower 1C according to the first modification of the third embodiment, and corresponds to the cross-sectional view taken along the line II-II shown in FIG.
  • FIG. 15 is a perspective view showing an impeller 3 according to a first modification of the third embodiment.
  • the main plate shaft end surface 6f is provided with a plurality of cylindrical ribs 63 arranged concentrically around the shaft 2a. As shown in FIG. 15, a portion of the main plate shaft end surface 6f other than the rib 63 is a flat surface 64. As shown in FIG. The rib 63 projects further toward the housing 2b than the plane 64. The tip of the rib 63 facing toward the housing 2b is a flat surface 61 that extends in the radial direction. Although the number of ribs 63 may be increased or decreased as appropriate, it is two in this modification.
  • rib 63a and a rib 63b When distinguishing the two ribs 63, they are referred to as a rib 63a and a rib 63b in order from the outside in the radial direction to the inside.
  • the plurality of ribs 63 are axially farther away from the housing 2b as they are located on the inner side in the radial direction.
  • the distance D in the axial direction between each rib 63 and the reference plane S is longer as the rib 63 is located on the inner side in the radial direction.
  • FIG. 14 only the distance D in the axial direction between the plane 61 of the rib 63a and the reference plane S is illustrated.
  • the fixing member 4 is in contact with the flat surface 61 of the rib 63a in this modification, it may be in contact with the flat surface 61 of the rib 63b. That is, by changing the radial dimension of the fixing member 4, it is possible to bring the fixing member 4 into contact with the flat surface 61 of the rib 63a, and it is also possible to bring the fixing member 4 into contact with the flat surface 61 of the rib 63b. be.
  • the plurality of planes 61 may have the configuration shown in FIG. 16.
  • FIG. 16 is a sectional view showing a blower 1D according to a second modification of the third embodiment, and corresponds to a sectional view taken along the line II-II shown in FIG.
  • a plurality of flat surfaces 61 may be provided by locally bending the main plate 6 while keeping the thickness of the entire main plate 6 constant. The more the plurality of planes 61 are located on the inner side in the radial direction, the further apart they are from the housing 2b in the axial direction.
  • FIG. 17 is a cross-sectional view showing a blower 1E according to the fourth embodiment, and corresponds to a cross-sectional view taken along the line II-II shown in FIG.
  • FIG. 18 is a perspective view showing the impeller 3 according to the fourth embodiment.
  • the main plate shaft end surface 6f is provided with a plurality of ribs 65 that extend radially from the shaft 2a and protrude toward the housing 2b.
  • the plurality of ribs 65 are spaced apart from each other in the circumferential direction.
  • the number of ribs 65 may be increased or decreased as appropriate, it is six in this embodiment.
  • a plurality of rectangular flat surfaces 66 arranged along the radial direction and a step surface 67 connecting adjacent flat surfaces 66 are provided on the surface of each rib 65 facing the housing 2b.
  • the shape of the surface of each rib 65 facing toward the housing 2b is rotationally symmetrical with the central axis C of the shaft 2a as an axis of symmetry. That is, the positions of the planes 66 of all the ribs 65 in the radial direction are the same.
  • the plane 66 extends in the radial direction. Although the number of planes 66 may be increased or decreased as appropriate, it is three in this embodiment. When distinguishing the three planes 66, they are referred to as a plane 66a, a plane 66b, and a plane 66c in order from the outside in the radial direction to the inside.
  • the stepped surface 67 extends in the axial direction.
  • the step surface 67 connects the inner edge of the adjacent plane 66 and the outer edge of the plane 66.
  • the number of stepped surfaces 67 is two in this embodiment.
  • the number of stepped surfaces 67 increases or decreases depending on the number of flat surfaces 66. When distinguishing the two stepped surfaces 67, they are referred to as a stepped surface 67a and a stepped surface 67b in order from the one closest to the housing 2b in the axial direction.
  • the stepped surface 67a connects the inner edge of the plane 66a and the outer edge of the plane 66b.
  • the stepped surface 67b connects the inner edge of the plane 66b and the outer edge of the plane 66c.
  • the plurality of planes 66 are axially farther away from the housing 2b as they are located on the inner side in the radial direction.
  • the distance D in the axial direction between each plane 66 and the reference plane S is longer as the plane 66 is located on the inner side in the radial direction. Note that in FIG. 17, only the distance D in the axial direction between the plane 66a and the reference plane S is illustrated.
  • the fixing member 4 is in contact with the plane 66a in this embodiment, it may be in contact with the plane 66b. That is, by changing the radial dimension of the fixing member 4, it is possible to bring the fixing member 4 into contact with the plane 66a, and it is also possible to bring the fixing member 4 into contact with the plane 66b.
  • the flat surface 66a becomes the contact portion 6g, and the portion of the main plate shaft end face 6f that is radially inner than the flat surface 66a becomes the separation portion 6h.
  • the flat surface 66b becomes the contact portion 6g, and the portion of the main plate shaft end surface 6f that is radially inner than the flat surface 66b becomes the separation portion 6h.
  • one of the plurality of planes 66a and 66b serves as the contact portion 6g.
  • the present embodiment can also achieve the same effects as the first, second, and third embodiments described above.
  • the plurality of planes 66 provided on the main plate shaft end surface 6f are such that the radially inner side thereof is further away from the housing 2b in the axial direction.
  • One of the contact portions 66 becomes the contact portion 6g.
  • the main plate shaft end surface 6f is provided with a plurality of ribs 65 that extend radially from the shaft 2a and protrude toward the housing 2b.
  • the plurality of planes 66 provided on the facing surfaces are axially farther away from the housing 2b as the planes are located on the inner side in the radial direction.
  • the contact point between the main plate 6 and the fixing member 4 can be changed not only in the radial direction but also in the circumferential direction. That is, by providing the main plate shaft end surface 6f with a plurality of ribs 65 that extend radially from the shaft 2a and protrude toward the housing 2b, the main plate 6 and the fixing member 4 are intermittently in contact with each other in the circumferential direction. do. Therefore, the natural frequency of the impeller 3 can be changed more finely.
  • FIG. 19 is a perspective view showing an impeller 3 according to a first modification of the fourth embodiment.
  • the positions of the planes 66 of each rib 65 in the radial direction are different from each other.
  • ribs 65 having a flat surface 66 on the radially outer portion of the rib 65 and ribs 65 having a flat surface 66 on the radially central portion of the rib 65 are alternately arranged in the circumferential direction. There is.
  • the ribs 65 adjacent to each other in the circumferential direction have flat surfaces 66 offset in the radial direction.
  • the point where the rib 65 and the fixing member 4 contact can be changed individually for each rib 65, and the radial direction from the central axis C of the shaft 2a to the point where the main plate 6 and the fixing member 4 make contact
  • the shortest distance L can be changed for each rib 65.
  • the main plate 6 may have the configuration shown in FIG. 20.
  • FIG. 20 is a perspective view showing an impeller 3 according to a second modification of the fourth embodiment.
  • the main plate side wall 6b is provided with an opening 6i that radially penetrates the main plate side wall 6b.
  • the opening 6i is provided for cooling the motor 2 with air. That is, a portion of the air sucked into the casing 5 from the suction port 5d hits the motor 2 through the opening 6i, thereby cooling the motor 2.
  • the contact point between the main plate 6 and the fixing member 4 can be changed not only in the radial direction but also in the circumferential direction. Therefore, even when the opening 6i is provided in the main plate 6, the location where the electromagnetic vibration of the motor 2 propagates to the impeller 3 is changed, and the natural frequency of the impeller 3 is changed so as to deviate from the resonant frequency. be able to. Therefore, the resonance in the blower 1 can be avoided or the resonance in the blower 1 can be reduced without using a damping material.
  • blowers 1 to 1E may be used for ventilation purposes, air conditioning purposes, and other purposes.
  • the impeller 3 is applied to a multi-blade blower, but the impeller 3 may be applied to a blower other than a multi-blade blower. That is, the impeller 3 is applicable to a general blower, regardless of whether it is a centrifugal blower or an axial blower.
  • blowers 1 to 1E are of the single suction type with one suction port 5d, but may be of the double suction type with two suction ports 5d.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2022/013588 2022-03-23 2022-03-23 羽根車および送風機 Ceased WO2023181193A1 (ja)

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JP2024509534A JP7599614B2 (ja) 2022-03-23 2022-03-23 送風機
PCT/JP2022/013588 WO2023181193A1 (ja) 2022-03-23 2022-03-23 羽根車および送風機

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019015206A (ja) * 2017-07-05 2019-01-31 日本電産株式会社 羽根車及び送風装置
JP2019203432A (ja) * 2018-05-22 2019-11-28 富士工業株式会社 回転体の取付装置、およびレンジフード
JP2020090913A (ja) * 2018-12-04 2020-06-11 リンナイ株式会社 遠心ファン
JP2020101153A (ja) * 2018-12-25 2020-07-02 リンナイ株式会社 送風ファン

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51163512U (https=) * 1975-06-20 1976-12-27
JPS5688999U (https=) * 1979-12-12 1981-07-16
JPH0649799U (ja) * 1992-12-10 1994-07-08 松下電器産業株式会社 電動送風機
JP4591619B1 (ja) * 2009-05-29 2010-12-01 ダイキン工業株式会社 圧縮機
JP5892569B2 (ja) * 2013-12-02 2016-03-23 株式会社飯塚鉄工所 スクリュー真空ポンプ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019015206A (ja) * 2017-07-05 2019-01-31 日本電産株式会社 羽根車及び送風装置
JP2019203432A (ja) * 2018-05-22 2019-11-28 富士工業株式会社 回転体の取付装置、およびレンジフード
JP2020090913A (ja) * 2018-12-04 2020-06-11 リンナイ株式会社 遠心ファン
JP2020101153A (ja) * 2018-12-25 2020-07-02 リンナイ株式会社 送風ファン

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