Rotating Equipment

Abstract

To provide a rotary apparatus that facilitates adjusting the weight of an impeller and suppresses increase in size and / or cost.SOLUTION: A face on a base 21 side of a first recess forms, in a rotary shaft direction, the first recess recessed in a first direction, and a face on the base 21 side of a second recess forms, in the rotary shaft direction, the second recess recessed in the first direction. A connection part is, in the rotary shaft direction, formed to protrude in a second direction. A face of a cover opposite the base 21 side is recessed toward an impeller 20 from a face opposite the base 21 side of the first recess to a face opposite the base 21 side of the second recess. An inner peripheral end of a top face part 23 extends in the rotary shaft direction, and an outer peripheral end of the top face part 23 extends in the rotary shaft direction. The inner peripheral end of the top face part is housed in the first recess, and the outer peripheral end of the top face part is housed in the second recess.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to rotating equipment. [Background technology]

[0002] BACKGROUND ART Conventionally, some vacuum cleaners and the like are equipped with a rotating device that uses a centrifugal fan (impeller) (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-154797 Summary of the Invention [Means for solving the problem]

[0004] A rotating device according to one aspect of the present invention includes a rotating shaft, an impeller, a motor, and a housing that accommodates the impeller and the motor. a first end and a second end in a rotation axis direction;The housing includes a cover that covers the impeller and a cylindrical portion that covers the motor. The impeller has a base, a plurality of blades provided on the base, and a top surface portion facing the base. The cover of the housing includes a first recess, a second recess, and a connecting portion that connects the first recess and the second recess. The base-side surface of the first recess forms a first recess that is recessed in a first direction in the rotational axis direction, and the base-side surface of the second recess forms a second recess that is recessed in the first direction in the rotational axis direction. The connecting portion is formed to be convex in a second direction in the rotational axis direction. The surface of the cover opposite to the base side is recessed toward the impeller, from the surface of the first recess opposite to the base side to the surface of the second recess opposite to the base side. An inner peripheral end of the top surface portion extends in the rotational axis direction, and an outer peripheral end of the top surface portion extends in the rotational axis direction. The connecting portion is located between the inner peripheral end of the top surface portion and the outer peripheral end of the top surface portion in the radial direction. The inner peripheral end of the top surface portion is housed in the first recess, and the outer peripheral end of the top surface portion is housed in the second recess. The cylindrical portion of the housing includes a holder that supports the motor, an annular wall portion that surrounds the motor, and a stator blade that connects the holder and the annular wall portion. The holder is located on the motor side of the base. The annular space, which forms part of an air passage communicating with the outside of the housing, is located on the second end side of the housing relative to the stator vanes. The holder for the cylindrical portion includes a plurality of pillars and a frame suspended from the plurality of pillars. The frame supports a bottom of the motor located on the second end side of the housing. In the radial direction, a portion of the annular space is formed by the outer periphery of the motor between the plurality of pillars and the annular wall portion. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is an external perspective view of a rotating device according to an embodiment. [Figure 2] FIG. 2 is a partially exploded perspective view of the rotating device shown in FIG. [Figure 3] FIG. 3 is a perspective view showing the configuration of the impeller shown in FIG. [Figure 4] FIG. 4 is a side view showing the configuration of the impeller shown in FIG. [Figure 5] FIG. 5 is a cross-sectional view showing the internal structure of the rotating device according to the embodiment. [Figure 6]6 is a partially enlarged cross-sectional view showing the internal structure of the main part of the rotating device shown in FIG. [Figure 7] FIG. 7 is a perspective view showing the configuration of the cylindrical portion shown in FIG. [Figure 8] FIG. 8 is a perspective view showing the configuration of a motor housed inside the rotating device shown in FIG. [Figure 9] FIG. 9 is a partial perspective view showing the appearance of a rotating device according to a modified example of the embodiment. [Figure 10] FIG. 10 is a partial cross-sectional view showing the internal structure of the rotating device shown in FIG. [Figure 11] 11 is a partially enlarged cross-sectional view showing the internal structure of the main part of the rotating device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0006] Rotating devices according to embodiments will be described below with reference to the drawings. Note that the present invention is not limited to these embodiments. Furthermore, the dimensional relationships and ratios of elements in the drawings may differ from reality. The dimensional relationships and ratios may differ between the drawings. Furthermore, the content described in one embodiment or modification also applies, in principle, to other embodiments or modifications.

[0007] (Embodiment) FIG. 1 is an external perspective view of a rotating device according to an embodiment. FIG. 2 is a partially exploded perspective view of the rotating device shown in FIG. 1. FIG. 3 is a perspective view showing the configuration of an impeller shown in FIG. 2. FIG. 4 is a side view showing the configuration of the impeller shown in FIG. 2. FIG. 5 is a cross-sectional view showing the internal structure of a rotating device according to an embodiment. FIG. 6 is a partially enlarged cross-sectional view showing the internal structure of a main part of the rotating device shown in FIG. 5. FIG. 7 is a perspective view showing the configuration of a cylindrical part shown in FIG. 1. FIG. 8 is a perspective view showing the configuration of a motor accommodated inside the rotating device shown in FIG. 1. FIG. 2 shows a state in which a cover is removed from the rotating device shown in FIG. 1. FIG. 6 is an enlarged view of part A in FIG. 5.

[0008] The illustrated Z direction is the rotational axis direction of the rotating device in this embodiment. Of the rotational axis directions, the Z1 direction is the first direction, and the Z2 direction is the second direction. Also, of the rotational axis directions, the Z direction is the radial direction perpendicular to the rotational axis direction of the rotating device in this embodiment. Of the radial directions, the direction away from the axis X is the radially outward direction, and the direction toward the axis X is the radially inward direction. The illustrated axis X extends in the same direction as the rotational axis direction.

[0009] 1 is incorporated into, for example, a vacuum cleaner, a suction device, etc. As shown in FIG. 5, the rotating device 1 includes a housing 10, an impeller 20, a shaft 30, a motor 40, and a substrate 50.

[0010] The housing 10 accommodates at least the impeller 20, the shaft 30, and the motor 40 therein, and is partially formed by the substrate 50. The housing 10 is formed in a cylindrical shape and has two spaces 2 and 3 therein, with an air passage 5 formed inside. A portion of this air passage 5 is formed by the two spaces 2 and 3. Space 2 is the internal space of the housing 10 that accommodates at least the impeller 20. Space 3 is connected to space 2 and is the internal space of the housing 10 that accommodates at least the motor 40. Space 3 communicates with the external space through an opening 120a when the substrate 50 is assembled to the cylindrical portion 12. In other words, the air passage 5 communicates with the outside of the housing 10 through the opening 120a. The housing 10 includes a cover 11 and a cylindrical portion 12. The housing 10 has two ends in the rotational axis direction. Of the two ends of this housing 10, one end in the first direction is referred to as a first end, and the other end in the second direction is referred to as a second end.

[0011] As shown in Figures 1, 2, and 5, the cover 11 is a part that covers the impeller 20 housed in the housing 10. The cover 11 is a part of the housing 10, and is disposed on the first end side of the housing 10 in the direction of the rotation axis. In other words, the cover 11 is assembled to the tubular portion 12 from the first direction. The cover 11 is formed in a circular shape when viewed from the direction of the rotation axis. The cover 11 is formed of, for example, synthetic resin. The cover 11 has a ceiling portion 110 and an opening 115 that opens toward the first direction.

[0012] When the cover 11 is attached to the cylindrical portion 12, the ceiling portion 110 is formed at a position facing the impeller 20 housed in the housing 10 in the rotational axis direction. The ceiling portion 110 has a plurality of projections and recesses. As shown in FIGS. 5 and 6 , the surface of the ceiling portion 110 facing the cylindrical portion 12 has recesses 111 and 112 that are recessed in a first direction in the rotational axis direction. The recesses 111 and 112 are both formed as grooves extending around the entire circumferential direction of the ceiling portion 110. The recesses 111 and 112 house a portion of the impeller 20 housed in the housing 10 therein. The recesses 111 and 112 are connected by a connecting portion 113 that constitutes the ceiling portion 110. The connecting portion 113 is formed in a convex shape in a second direction in the rotational axis direction relative to a bottom surface 111 a of the recess 111 and a bottom surface 112 a of the recess 112. The connecting portion 113 is formed around the entire periphery of the ceiling portion 110 in the circumferential direction.

[0013] The opening 115 is a through-hole that penetrates the ceiling portion 110 in the rotation axis direction. When viewed from the rotation axis direction, the opening 115 is formed in a circular shape. The opening 115 is provided in the center of the ceiling portion 110, where the axis X passes. The space portion 2 communicates with the external space via the opening 115. The opening 115 is a portion that serves as a gas suction port in the rotating device 1.

[0014] As shown in FIG. 5 , the tubular portion 12 is a portion that covers the motor 40 accommodated in the housing 10. The tubular portion 12 is formed in a cylindrical shape. The tubular portion 12 is formed of, for example, synthetic resin. Note that the tubular portion 12 may also be formed of a metal material such as an aluminum alloy. The tubular portion 12 rotatably supports the shaft 30 via bearings 125 and 126 and holds the motor 40 accommodated therein. The bearing 125 is disposed inside a holder 121. The bearing 126 is disposed in a frame 123 that supports the motor 40 from a second direction in the rotational axis direction. In other words, the bearing 126 is supported by the frame 123. The tubular portion 12 has an annular wall portion (circumferential wall portion) 120 that surrounds the motor 40, a holder 121 that supports the motor 40 inside the peripheral wall portion 120, and a plurality of stator vanes 122 that connect the holder 121 and the peripheral wall portion 120. The holder 121 also includes a frame 123 that supports a portion of the motor 40 on the second end side of the housing 10, a bearing 126 supported by the frame 123, and a cover part 127 that is on the first end side of the housing 10 relative to the frame 123. The holder 121 is also disposed on the second end side of the housing 10 relative to the impeller 20.

[0015] The peripheral wall portion 120 is formed in a cylindrical shape. The cover 11 is attached to an end portion (first end portion) of the peripheral wall portion 120 located on the first end side of the housing 10. The end portion (second end portion) of the peripheral wall portion 120 located on the second end side of the housing 10 in the rotational axis direction has three openings 120a. The three openings 120a are formed at regular intervals in the circumferential direction. The openings 120a are formed so as to open in the radial direction in the tubular portion 12. In other words, the openings 120a are formed so as to open in the radial direction from the tubular portion 12 toward the outside. The openings 120a are formed so as to be recessed from the second end portion of the peripheral wall portion 120 toward the first end portion in the rotational axis direction. The openings 120a are formed in a substantially rectangular shape in the radial direction when viewed from the outside.

[0016] As shown in FIGS. 5 and 7 , the holder 121 is provided inside the tubular portion 12 when viewed in the rotational axis direction, and is formed in a substantially cylindrical (hollow) shape. The holder 121 is connected to the peripheral wall portion 120 in the radial direction via a plurality of stator vanes 122. The holder 121 holds the motor 40. The holder 121 is connected to the stator 42 of the motor 40 inside the housing 10. The holder 121 has a frame 123 suspended on the second end side of the housing 10 relative to the cover portion 127 via three pillars 130. The holder 121 supports a portion (bottom) of the motor 40 located on the second end side of the housing 10 by the frame 123 in the rotational axis direction. The motor 40 is held by the cover portion 127 and the frame 123 so that the motor 40 is sandwiched between the frame 123 and the cover portion 127 in the rotational axis direction. The holder 121 is disposed on the vane 122 side of the frame 123. The holder 121 has a through-hole 121a in its central portion, through which the axis X passes, through which the shaft 30 passes. The holder 121 rotatably supports the shaft 30 via bearings 125 and 126. When viewed from the rotational axis direction, the holder 121 defines an annular space 3a between the holder 121 and the housing 10. The annular space 3a constitutes part of the space 3 described above, but is located between the space 2 and the space 3 in the rotational axis direction. The annular space 3a is located on the air passage 5 for gas flowing from the impeller 20 to the motor 40 side, and is located downstream of the vane 122. As shown in FIG. 5 , the air passage 5 is a passage through which gas passes within the housing 10 due to the rotation of the impeller 20. The air passage 5 is formed along the rotational axis direction around the outer periphery of the motor 40 and can cool the motor 40.

[0017] The plurality of stator vanes 122 connect the peripheral wall portion 120 and the holder 121 in the radial direction. The plurality of stator vanes 122 also serve as connecting portions. The plurality of stator vanes 122 extend radially from the inner peripheral surface of the peripheral wall portion 120 toward the inside (the holder 121) and are connected to the outer peripheral surface of the holder 121. The plurality of stator vanes 122 are arranged around the entire circumference at regular intervals along the circumferential direction. Each of the plurality of stator vanes 122 has a blade shape, and its cross-sectional shape as viewed from the radial direction is inclined from one side to the other in the circumferential direction. The plurality of stator vanes 122 support the holder 121 relative to the housing 10. When the holder 121 is viewed from the direction of the rotation axis, gaps are provided between adjacent stator vanes 122 in the circumferential direction, through which gas can pass. The gaps formed by the plurality of stator vanes 122 connect the space portion 2 and the space portion 3 and constitute part of the air passage 5.

[0018] The rotating device of this embodiment includes an impeller 20, which forms a so-called centrifugal fan as shown in FIGS. 2 to 4. The impeller 20 is formed of, for example, a metal member such as an aluminum alloy or stainless steel, or a resin member. As shown in FIG. 5, the impeller 20 is housed in a space 2 formed by a cover 11 and a cylindrical portion 12. The impeller 20 is driven by a motor 40, and rotates, for example, in the direction R shown in FIG. 2. The impeller 20 is fixed to a shaft 30 extending in the direction of the rotation axis of the motor 40, and rotates about an axis line X as a central axis when driven by the motor 40, generating an airflow from the direction of the rotation axis toward the outside in the radial direction. The impeller 20 of this embodiment includes a base 21, a plurality of blades 22, and a top surface portion 23.

[0019] The base 21 is formed in, for example, a disk shape. The base 21 has a through hole 21a, through which the shaft 30 is inserted, in a central portion passing through the axis X. The base 21 is fastened to the shaft 30 inserted into the through hole 21a by a fastening member such as a bolt.

[0020] The plurality of blades 22 connect the base 21 and the top surface 23 in the rotation axis direction. Each of the plurality of blades 22 extends from the base 21 toward a first end of the housing 10 (in a first direction) and is formed to be connected to the top surface 23. The plurality of blades 22 all have the same cross-sectional shape when viewed from the rotation axis direction. The cross section of the blade 22 when viewed from the rotation axis direction has a shape that is curved and inclined backward with respect to the rotation direction. The blade 22 is, for example, a backward-facing blade with respect to the rotation direction.

[0021] The top surface portion 23 is formed in an annular shape when viewed from the rotation axis direction. As shown in Figures 5 and 6, the cross section of the top surface portion 23 viewed from the radial direction has a U-shape that is recessed toward the second end (in the second direction) of the housing 10. The top surface portion 23 has an annular wall portion 24 and an opening 25.

[0022] The wall portion 24 is formed to extend from the outer peripheral end of the top surface portion 23 toward a first end of the housing 10 in the rotational axis direction (in a first direction). The wall portion 24 is formed to be perpendicular or substantially perpendicular to a base (hereinafter referred to as a flat portion) 23a of the top surface portion 23. The flat portion 23a of the top surface portion 23 extends in a radial direction perpendicular to the rotational axis direction. The wall portion 24 is preferably formed to extend from the outer peripheral end of the top surface portion 23 in a direction different from the second direction in the rotational axis direction. For example, the wall portion 24 is preferably formed so as not to face the plurality of blades 22 in the radial direction. As shown in FIGS. 5 and 6 , the wall portion 24 is accommodated inside the recess 111 when the cover 11 is assembled to the tubular portion 12. The wall portion 24 is formed so that a wall end 24a on the first direction side faces a bottom surface 111a of the recess 111 when the cover 11 is assembled to the tubular portion 12. When the cover 11 is attached to the cylindrical portion 12, the wall portion 24 has a gap I between it and the bottom surface 111a of the recessed portion 111. A gap I of a certain length is provided between the wall portion 24 and the recessed portion 111 so that the wall portion 24 does not come into contact with the inner circumferential surface of the recessed portion 111 due to the centrifugal force caused by the high-speed rotation of the impeller 20. The wall portion 24 may have a recessed portion 24b formed therein. In other words, the impeller 20 in this embodiment has a portion where the wall portion 24 can adjust the rotational balance by negative balance.

[0023] The recess 24b is formed so as to recess from the wall end 24a of the wall 24 toward the second end of the housing 10 (toward the second direction of the rotational axis). As shown in Fig. 4, the recess 24b has a semicircular shape curved toward the second direction when viewed from the radial direction. The recess 24b may be provided in not only one place around the wall 24 but also in multiple places.

[0024] The opening 25 is a through-hole that penetrates the top surface portion 23 in the rotational axis direction. The opening 25 is formed in a circular shape when viewed from the rotational axis direction. The opening 25 is provided in the center portion of the top surface portion 23, where the axis X passes. The opening 25 is a portion that serves as a gas suction port in the impeller 20. The inner peripheral end of the opening 25 is formed to extend toward the first end of the housing 10 (toward the first direction in the rotational axis direction). The inner peripheral end of the opening 25 is housed inside the recess 112 when the cover 11 is assembled to the tubular portion 12. The height of the inner peripheral end of the opening 25 in the rotational axis direction may be any height, but is preferably equal to or greater than the height of the wall portion 24 in the rotational axis direction.

[0025] The shaft 30 is formed in a cylindrical shape, extends in the direction of the rotation axis, and is rotatably supported by the housing 10. The shaft 30 is made of a metal material such as stainless steel. The shaft 30 constitutes a part of a rotor 41, which will be described later. With the motor 40 held by the holder 121, the shaft 30 is inserted into a through-hole 121a of the holder 121, and the impeller 20 is fixed to the shaft 30. The shaft 30 is rotatably supported by bearings 125 and 126.

[0026] The motor 40 rotates the impeller 20 around the axis X, which is the rotation axis. The motor 40 rotates the impeller 20 via the shaft 30. The motor 40 is housed in the space 3 formed by the cylindrical portion 12 and the substrate 50. The motor 40 is held by a frame 123 suspended from the cover 127 via columns 130. The motor 40 has a rotor 41 and a stator 42. The rotor 41 is formed of a magnetic material equipped with a magnet and rotates relative to the stator 42 around the axis X, which is the rotation axis. As shown in FIG. 8, the stator 42 is composed of a stator core 42a, an insulator 42b, and a coil 42c. The stator core 42a is formed by laminating multiple electromagnetic steel plates (multiple magnetic materials). The coil 42c is formed by winding a wire through the insulator 42b.

[0027] The substrate 50 is supported by the housing 10 and fixed to the second end of the cylindrical portion 12 so as to close the opening of the cylindrical portion 12 on the second direction side. The substrate 50, while fixed to the housing 10, is disposed on the second end side of the housing 10 relative to the motor 40. The substrate 50 is electrically connected to the motor 40 via a connection terminal (not shown). The substrate 50 is formed of an insulating resin material such as epoxy. The substrate 50 faces the motor 40 in the direction of the rotation axis. The substrate 50 is electrically connected to the motor 40 via a connection terminal (not shown). The substrate 50 is connected to a power source external to the rotating device 1, converts power supplied from the power source into drive power, and supplies the power to the motor 40. Electronic components (not shown) are disposed on the substrate 50. The electronic components include, for example, an inverter and a control IC. The external power source may be, for example, a commercial power source or a battery.

[0028] Next, the operation of the rotating device 1 will be described. The motor 40 starts to operate when a current flows from the substrate 50, causing the shaft 30 to rotate around the axis X. As the shaft 30 rotates, the impeller 20 starts to rotate. As the impeller 20 rotates, gas is sucked in through the opening 25 provided in the top surface 23, flows along the air passage 5, and is discharged radially outward through gaps between adjacent blades 22 and between the base 21 and the top surface 23. As the impeller 20 rotates, gas that has flowed in through the opening 115 in the cover 11 passes through the gaps formed by the multiple blades 22 and is discharged to the outside of the impeller 20. The gas discharged to the outside of the impeller 20 flows in the second direction along the inner circumferential surface of the cover 11 and flows into the space 3 through gaps formed by the multiple stator vanes 122. The gas flowing into the space 3 passes through the opening 120a and is directly discharged to the outside, or hits the substrate 50 and passes through the opening 120a and is indirectly discharged to the outside.

[0029] As described above, the rotating device 1 according to one aspect of the present invention includes the shaft 30, the impeller 20, and the motor 40 that rotates the impeller 20 around the shaft 30 as a rotation axis. The impeller 20 is formed with an annular wall portion 24 that extends from the outer peripheral end of the top surface portion 23 in one direction of the rotation axis. The wall portion 24 is formed with a recess 24b. By forming the recess 24b in the wall portion 24 in this manner, it is possible to achieve a negative balance of the impeller 20, making it easier to adjust the weight of the impeller 20. As described above, there is no need to increase the outer diameter of the front plate that constitutes the impeller or to thicken the front plate, which makes it possible to suppress an increase in the size of the rotating device 1 and an increase in costs due to an increase in material.

[0030] Because centrifugal fans rotate at high speeds, even a slight change in weight can cause vibrations during high-speed rotation, so it is necessary to adjust the weight balance of the centrifugal fan.

[0031] Incidentally, when adjusting the weight balance of the centrifugal fan disclosed in Patent Document 1, for example, it is possible to achieve a negative balance by cutting a portion of the outer periphery of the front plate that constitutes the centrifugal fan, but this requires increasing the outer diameter of the front plate, which may result in an increase in the size of the entire centrifugal fan.Furthermore, if the front plate is made thicker, the weight of the centrifugal fan may increase, which may result in an increase in costs.

[0032] An example of an object of the present invention is to provide a rotating device that allows for easy weight adjustment of an impeller and prevents an increase in size and cost.

[0033] According to one aspect of the present invention, it is possible to easily adjust the weight of the impeller, thereby preventing an increase in size and cost.

[0034] As described above, the rotating device 1 according to one aspect of the present invention includes the impeller 20, the motor 40 that rotates the impeller 20 about a rotation axis, and the cylindrical housing 10 that accommodates at least the impeller 20 and the motor 40. The housing 10 includes a holder 121 that holds the motor 40, and a plurality of stator vanes 122 that are connected to the holder 121 and coupled with the holder 121. The holder 121 is coupled to a stator 42 of the motor 40 inside the housing 10. When viewed from the direction of the rotation axis, the holder 121 forms an annular space 3a between the holder 121 and the housing 10. The annular space 3a is located on the air passage 5 for gas flowing from the impeller 20 to the motor 40, and is located on the second end side of the housing 10 with respect to the stator vanes 122, forming part of the air passage 5. In this way, by connecting the holder 121 and the housing 10 with the stator vanes 122, the stator vanes 122 are present on the air passage 5 inside the housing 10, and the rotating device 1 has a configuration in which there are no obstacles (e.g., spokes) that obstruct the flow of gas, thereby improving the flow of gas on the air passage 5. For example, by providing the stator vanes 122 on the air passage 5, the static pressure on the low flow rate side is improved. Furthermore, by providing the stator vanes 122 on the air passage 5, the number of parts can be reduced, resulting in reduced part costs and weight reduction. Furthermore, by using the stator vanes as airfoil-shaped connecting parts, the radial cross-sectional shape changes and the rigidity of the part connecting the holder 121 and the housing 10 is increased, making it possible to, for example, make it difficult for vibrations generated by driving the motor 40 to be transmitted to the housing 10. Furthermore, it becomes possible to integrally mold the holder 121, the stator vanes 122, and a portion of the housing 10, thereby improving the productivity of the rotating device 1.

[0035] Furthermore, in the rotating device 1 according to an aspect of the present invention, the impeller 20 is made of a metal material, which increases the strength of the impeller compared to an impeller made of a resin material, thereby improving durability during high-speed rotation, for example.

[0036] Furthermore, in the rotating device 1 according to one aspect of the present invention, the ventilation path 5 communicates with the outside of the housing 10 through at least one opening 120a formed in the radial direction of the cylindrical portion 12. As a result, gas passing through the ventilation path 5 is discharged from the space portion 3 to the outside through the opening 120a, so that the gas sucked into the housing 10 can be efficiently and easily discharged to the outside.

[0037] (Modification of the embodiment) Fig. 9 is a partial perspective view showing the appearance of a rotating device according to a modified example of the embodiment. Fig. 10 is a partial cross-sectional view showing the internal structure of the rotating device shown in Fig. 9. Fig. 11 is a partial enlarged cross-sectional view showing the internal structure of a main part of the rotating device shown in Fig. 9. Fig. 11 is an enlarged view of part B in Fig. 10.

[0038] A rotating device 1A according to a modified example of the embodiment differs from the above embodiment in that a ceiling portion 110A of a cover 11A does not have recesses 111, 112. A housing 10A includes a cover 11A and a cylindrical portion 12. The cover 11A is disposed on the first end side of the housing 10A and is fixed to the cylindrical portion 12. The cover 11A is formed in a circular shape when viewed from the direction of the rotation axis. The cover 11A has a ceiling portion 110A and an opening 115.

[0039] The ceiling portion 110A is formed in a position facing the impeller 20 housed in the housing 10A in the rotational axis direction when the cover 11A is assembled to the tubular portion 12. As shown in FIGS. 10 and 11 , the ceiling portion 110A is free of irregularities and has a base 116 (a flat portion formed flat in the radial direction perpendicular to the rotational axis direction). The base 116 is formed around the entire circumferential direction of the ceiling portion 110A. The base 116 is formed in a position facing the flat portion 23a of the impeller 20 in the radial direction when the cover 11A is assembled to the tubular portion 12. Because the ceiling portion 110A is free of irregularities, it is possible to prevent dust and the like from accumulating in, for example, recesses on the outside. Furthermore, the lack of irregularities in the ceiling portion 110A improves the durability of a mold required to mold the cover 11A.

[0040] Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the above embodiments and modifications, and various modifications are possible without departing from the spirit thereof. For example, in the above embodiments, the recess 24b has a semicircular shape curved toward the second end (second direction) of the housing 10, 10A when viewed from the radial direction. However, the recess 24b is not limited to this, and may have a rectangular, V-shaped, or U-shaped shape. Furthermore, the recess 24b is formed so as to be recessed from the wall end 24a of the wall 24 toward the second direction in the rotational axis direction. However, the recess 24b is not limited to this, and may be a through-hole penetrating the wall 24. In this case, the through-hole formed in the wall 24 is not cut out from the wall end 24a, but is circular.

[0041] In the above embodiment, the impeller 20 is formed of a metal material, but this is not a limitation. For example, the impeller 20 may be formed of a synthetic resin whose mechanical properties, such as strength and heat resistance, are equivalent to or superior to those of metal. Furthermore, the impeller 20 is formed with an annular wall portion 24 extending from the outer peripheral end of the top surface portion 23 toward the first end of the housing 10, 10A (first direction along the rotational axis), but this is not a limitation. For example, the wall portion 24 may be formed to extend from the outer peripheral end of the top surface portion 23 toward the second end of the housing 10, 10A (second direction along the rotational axis).

[0042] Furthermore, in the above embodiment, the holder 121 is connected to the stator 42 of the motor 40 inside the housing 10, 10A, and forms an annular space 3a between the holder 121 and the housing 10, 10A when viewed in the direction of the rotation axis, but this is not limited to this. That is, the annular space 3a is located on the air passage 5 for the gas flowing from the impeller 20 to the motor 40 side, and is located downstream of the stator vanes 122, but this is not limited to this. For example, a plurality of spokes connecting the holder 121 and the housing 10, 10A may be formed on the second end side of the housing 10, 10A relative to the stator vanes 122 (downstream of the stator vanes 122).

[0043] Furthermore, the present invention is not limited to the above-described embodiment. The present invention also encompasses configurations in which the above-described components are appropriately combined. For example, if the impeller 20 has an annular wall portion 24 extending from the outer circumferential end of the top surface portion 23 in one (first direction or second direction) or both (first direction and second direction) directions along the rotation axis, the holder 121 and the housing 10 may be connected to the stator vanes 122 by spokes or the like, and the annular space 3a may not be formed downstream of the stator vanes 122. Furthermore, if the holder 121 and the housing 10 are connected only by the stator vanes 122 and the annular space 3a is formed downstream of the stator vanes 122, the impeller 20 may not have the annular wall portion 24. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-described embodiment, and various modifications are possible. [Explanation of symbols]

[0044] 1,1A Rotating device, 10,10A Housing, 11,11A Cover, 12 Cylinder, 20 Impeller, 21 Base, 22 Blade, 23 Top surface, 24 Wall, 24b Recess, 30 Shaft, 40 Motor, 121 Holder

Claims

1. A rotation axis; an impeller having a base, a plurality of blades provided on the base, and a top surface portion facing the base; A motor; a housing that accommodates the impeller and the motor; Equipped with the housing includes a cover that covers the impeller, a cylindrical portion that covers the motor, and a first end and a second end in a rotation axis direction, the cover of the housing includes a first recess, a second recess, and a connecting portion that connects the first recess and the second recess; a first recess formed in a surface of the first recess facing the base, the first recess being recessed in a first direction in the rotation axis direction; a second recess formed on a surface of the second recess facing the base, the second recess being recessed in a first direction in the rotation axis direction; The connecting portion is formed in a convex shape in a second direction in the rotation axis direction, a surface of the cover opposite to the base side is recessed toward the impeller from a surface of the first recess opposite to the base side to a surface of the second recess opposite to the base side, an inner peripheral end of the top surface portion extends in the direction of the rotation axis, The outer peripheral edge of the top surface portion extends in the direction of the rotation axis, The connecting portion is located between an inner peripheral end of the top surface portion and an outer peripheral end of the top surface portion in the radial direction, an inner peripheral edge of the top surface portion is accommodated in the first recess; an outer peripheral edge of the top surface portion is accommodated in the second recess; the cylindrical portion of the housing includes a holder that supports the motor, an annular wall that surrounds the motor, and a stator vane that connects the holder and the annular wall, the holder is disposed on the motor side with respect to the base, the annular space forming a part of an air passage communicating with the outside of the housing is located on a second end side of the housing with respect to the stator vane, the holder of the cylindrical portion includes a plurality of pillars and a frame suspended from the plurality of pillars, the frame supports a bottom portion of the motor on the second end side of the housing; a part of the annular space in the radial direction is formed by the outer periphery of the motor between the plurality of pillars and the annular wall portion; Rotating equipment.

2. The rotating device according to claim 1 , wherein the impeller is formed of a metal member or a resin member.

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