Rotary apparatus

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] 2. Description of the Related Art Conventionally, some vacuum cleaners and the like are equipped with a rotating device using a centrifugal fan (impeller) (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-154797 A Summary of the Invention [Means for solving the problem]

[0004] A rotating device according to an aspect of the present invention includes a rotating shaft, an impeller, a motor, and a cover that covers the impeller. The impeller has a base, a plurality of blades provided on the base, and a top surface portion that faces the base. The cover includes a first recess and a second recess, and a connecting portion that connects the first recess and the second recess. The surface of the first recess on the base side forms a first recess that is recessed in a first direction in the rotation axis direction, and the surface of the second recess on the base side forms a second recess that is recessed in the first direction in the rotation axis direction. The connecting portion is formed to be convex in a second direction in the rotation axis direction. The surface of the cover on the opposite side to the base side is recessed toward the impeller from the surface of the first recess on the opposite side to the base side to the surface of the second recess on the opposite side to the base side. An inner peripheral end of the top surface portion extends in the rotation axis direction, and an outer peripheral end of the top surface portion extends in the rotation 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 accommodated in the first recess, and the outer peripheral end of the top surface portion is accommodated in the second recess. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is an external perspective view of a rotating device according to an embodiment. [Diagram 2] FIG. 2 is a partial exploded perspective view of the rotating device shown in FIG. [Diagram 3] FIG. 3 is a perspective view showing a configuration of the impeller shown in FIG. [Figure 4] FIG. 4 is a side view showing the configuration of the impeller shown in FIG. [Diagram 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 a main part of the rotating device shown in FIG. [Figure 7] FIG. 7 is a perspective view showing a configuration of the cylindrical portion shown in FIG. [Figure 8] FIG. 8 is a perspective view showing the configuration of a motor accommodated 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] FIG. 11 is a partially enlarged cross-sectional view showing the internal structure of a main part of the rotating device shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] Hereinafter, a rotating device according to an embodiment will be described with reference to the drawings. Note that the present invention is not limited to the embodiment. In addition, the dimensional relationship between elements in the drawings, the ratio between elements, etc. may differ from reality. The drawings may also include parts with different dimensional relationships and ratios. In principle, the contents described in one embodiment or modified example are similarly applied to other embodiments or modified examples.

[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 a configuration of an impeller shown in FIG. 2. FIG. 4 is a side view showing a configuration of an impeller shown in FIG. 2. FIG. 5 is a cross-sectional view showing an internal structure of a rotating device according to an embodiment. FIG. 6 is a partially enlarged cross-sectional view showing an internal structure of a main part of the rotating device shown in FIG. 5. FIG. 7 is a perspective view showing a configuration of a cylindrical portion shown in FIG. 1. FIG. 8 is a perspective view showing a 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 direction of the rotation axis of the rotating device in this embodiment. Of the rotation axis directions, the Z1 direction is the first direction, and the Z2 direction is the second direction. Also, the Z direction is perpendicular to the rotation 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 rotation axis direction.

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

[0010] The housing 10 accommodates at least the impeller 20, the shaft 30, and the motor 40 therein, and is partially constituted by the substrate 50. The housing 10 is formed in a cylindrical shape, has two spaces 2 and 3 therein, and has an air passage 5 formed inside. A part of this air passage 5 is formed by the two spaces 2 and 3. The space 2 is an internal space of the housing 10 in which at least the impeller 20 is accommodated. The space 3 is an internal space of the housing 10 that communicates with the space 2 and accommodates at least the motor 40. The space 3 communicates with the external space through the 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 includes two ends in the rotation 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. That is, the cover 11 is assembled to the cylindrical 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, a synthetic resin. The cover 11 has a ceiling portion 110 and an opening portion 115 that opens toward the first direction.

[0012] The ceiling portion 110 is formed at a position facing the impeller 20 housed in the housing 10 in the rotation axis direction when the cover 11 is attached to the tubular portion 12. 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 on the tubular portion 12 side has recesses 111 and 112 recessed toward a first direction in the rotation axis direction. The recesses 111 and 112 are both formed in a groove shape over the entire circumference in the circumferential direction of the ceiling portion 110. The recesses 111 and 112 house a part of the impeller 20 housed in the housing 10 inside. The recesses 111 and 112 are connected to each other by a connecting portion 113 constituting the ceiling portion 110. The connecting portion 113 is formed in a convex shape toward a second direction in the rotation axis direction with respect to a bottom surface 111a of the recess 111 and a bottom surface 112a of the recess 112. The connecting portion 113 is formed around the entire circumferential direction of the ceiling portion 110 .

[0013] The opening 115 is a through-hole that penetrates the ceiling portion 110 in the rotation axis direction. The opening 115 is formed in a circular shape when viewed from the rotation axis direction. The opening 115 is provided in the center of the ceiling portion 110 through which the axis X passes. The space portion 2 communicates with the outside 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 or the like. The tubular portion 12 may 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 the holder 121. The bearing 126 is disposed in a frame 123 that supports the motor 40 from the second direction in the rotation axis direction. That is, 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. Moreover, the holder 121 includes a frame 123 that supports a part 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 on the first end side of the housing 10 with respect to the frame 123. The holder 121 is also disposed on the second end side of the housing 10 with respect 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) of the peripheral wall portion 120 on the first end side of the housing 10. In the rotation axis direction, the end portion (second end portion of the peripheral wall portion 120) of the peripheral wall portion 120 on the second end side of the housing 10 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 rotation 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 FIG. 5 and FIG. 7, the holder 121 is provided inside the tube portion 12 and is formed in a substantially cylindrical shape (hollow shape) when viewed from the rotation axis direction. The holder 121 is connected to the peripheral wall portion 120 via a plurality of stator vanes 122 in the radial direction. 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 with respect to the cover portion 127 via three columns (pillars) 130. The holder 121 supports a part (bottom part) of the motor 40 on the second end side of the housing 10 by the frame 123 in the rotation 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 rotation axis direction. The holder 121 is disposed on the vane 122 side with respect to the frame 123. The holder 121 has a through hole 121a through which the shaft 30 is inserted in a central portion where the axis line X passes. The holder 121 rotatably supports the shaft 30 via bearings 125 and 126. When viewed from the rotation axis direction, the holder 121 forms a space portion 3a formed in an annular shape between the holder 121 and the housing 10. The annular space portion 3a constitutes a part of the space portion 3 described above, but is located between the space portion 2 and the space portion 3 in the rotation axis direction. The annular space portion 3a is located on the ventilation path 5 of the gas flowing from the impeller 20 to the motor 40 side, and is located downstream with respect to the vane 122. The ventilation path 5 is a passage through which the gas passes in the housing 10 by the rotation of the impeller 20, as shown in FIG. 5. The ventilation path 5 is formed along the rotation axis direction on the outer periphery side 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 a connecting portion. The plurality of stator vanes 122 extend in the radial direction from the inner peripheral surface of the peripheral wall portion 120 toward the inside (the holder 121), and are formed by connecting to the outer peripheral surface of the holder 121. The plurality of stator vanes 122 are arranged all around at regular intervals along the circumferential direction. Each of the plurality of stator vanes 122 has a blade shape, and a cross-sectional shape viewed from the radial direction has a shape that is inclined from one side to the other in the circumferential direction. The plurality of stator vanes 122 support the holder 121 with respect to the housing 10. When the holder 121 is viewed from the rotation axis direction, a gap through which gas passes is provided between the stator vanes 122 adjacent to each other in the circumferential direction. The gap formed by the plurality of stator vanes 122 communicates between the space portion 2 and the space portion 3, and constitutes a part of the air passage 5.

[0018] The rotating device in this embodiment includes an impeller 20, and 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 R direction shown in Fig. 2. The impeller 20 is fixed to a shaft 30 extending in the rotation axis direction of the motor 40, and rotates about an axis line X as a central axis by driving the motor 40, generating an airflow from the rotation axis direction toward the outside in the radial direction. The impeller 20 in this embodiment has a base 21, a plurality of blades 22, and a top surface portion 23.

[0019] The base 21 is formed, for example, in a disk shape. The base 21 has a through hole 21a through which the shaft 30 is inserted at 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 blades 22 connect the base 21 and the top surface portion 23 in the rotation axis direction. Each of the 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 portion 23. The blades 22 all have the same cross-sectional shape as viewed from the rotation axis direction. The cross-section of the blade 22 as 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 Fig. 5 and Fig. 6, the top surface portion 23 has a U-shaped cross section viewed from the radial direction that is recessed (in the second direction) toward the second end 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 extending from the outer peripheral end of the top surface portion 23 toward the first end of the housing 10 in the rotation axis direction (in the first direction). The wall portion 24 is formed so as to be perpendicular or substantially perpendicular to the base (hereinafter referred to as the 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 rotation axis direction. It is preferable that the wall portion 24 is formed extending from the outer peripheral end of the top surface portion 23 in a direction different from the second direction in the rotation axis direction. For example, it is preferable that the wall portion 24 is formed so as not to face the plurality of blades 22 in the radial direction. As shown in FIG. 5 and FIG. 6, the wall portion 24 is accommodated inside the recess 111 in a state where the cover 11 is assembled to the tube portion 12. The wall portion 24 is formed so that the wall end portion 24a on the first direction side faces the bottom surface 111a of the recess 111 in a state where the cover 11 is assembled to the tube 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 recess 111. A certain length of gap I is provided between the wall portion 24 and the recess 111 so that the wall portion 24 does not come into contact with the inner circumferential surface of the recess 111 due to the centrifugal force caused by the high-speed rotation of the impeller 20. The wall portion 24 may be formed with a recess 24b. 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 portion 24 toward the second end of the housing 10 (toward the second direction of the rotation 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 at not only one location around the wall portion 24 but also multiple locations.

[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 part of the top surface portion 23 through which the axis line X passes. The opening 25 is a part 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 accommodated inside the recess 112 in a state in which the cover 11 is assembled to the cylindrical portion 12. The height of the inner peripheral end of the opening 25 in the rotational axis direction may be any height, but it is preferable that the height is 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 formed of a metal material such as stainless steel. The shaft 30 constitutes a part of a rotor 41 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 thereto. 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 a cover portion 127 via a column 130. The motor 40 has a rotor 41 and a stator 42. The rotor 41 is formed of a magnetic material having a magnet, and rotates relatively 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 a plurality of electromagnetic steel plates (a plurality of magnetic materials). The coil 42c is formed by winding a winding 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 on the second direction side of the cylindrical portion 12. The substrate 50 is arranged on the second end side of the housing 10 with respect to the motor 40 while being fixed to the housing 10. The substrate 50 is electrically connected to the motor 40 by a connection terminal (not shown). The substrate 50 is formed of a resin member having insulating properties 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 by a connection terminal (not shown). The substrate 50 is connected to a power source outside the rotating device 1, and converts the power supplied from the power source into driving power and supplies it to the motor 40. Electronic components (not shown) are arranged 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 be driven when a current flows from the substrate 50, and rotates the shaft 30 around the axis line X. In response to the rotation of the shaft 30, the impeller 20 starts to rotate. As the impeller 20 rotates, gas is sucked in from the opening 25 provided in the top surface portion 23, flows along the air passage 5, and is discharged radially outward through the gaps between the adjacent blades 22 and between the base 21 and the top surface portion 23. When the impeller 20 rotates, gas that has flowed in from the opening 115 of 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 portion 3 through the gaps formed by the multiple stator vanes 122. The gas that has flowed 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 with the shaft 30 as a rotation axis. The impeller 20 is formed with an annular wall portion 24 extending from the outer circumferential end of the top surface portion 23 to one side in the rotation axis direction. The wall portion 24 is formed with a recess 24b. In this way, by forming the recess 24b in the wall portion 24, it is possible to achieve a negative balance of the impeller 20, and it becomes easy to adjust the weight of the impeller 20. As described above, it is not necessary to increase the outer diameter of the front plate constituting the impeller or to make the front plate thick, so that it is possible to suppress the increase in size of the rotating device 1 and the increase in costs due to an increase in materials.

[0030] Since 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 the above Patent Document 1, it is possible to achieve a negative balance by, for example, cutting a part of the outer periphery of the front plate constituting the centrifugal fan, but this requires increasing the outer diameter of the front plate, which may increase the size of the entire centrifugal fan. Also, if the front plate is made thicker, the weight of the centrifugal fan will increase, which may lead to an increase in costs.

[0032] An example of an object of the present invention is to provide a rotating device in which the weight of an impeller can be easily adjusted and an increase in size and cost can be suppressed.

[0033] According to one aspect of the present invention, the weight of the impeller can be easily adjusted, and increases in size and costs can be suppressed.

[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 a 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 to 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 a part of the air passage 5. In this way, by connecting the holder 121 and the housing 10 with the stator vane 122, the stator vane 122 is present on the air passage 5 in the housing 10, and the rotating device 1 has a configuration in which no obstacles (e.g., spokes, etc.) that obstruct the flow of gas are found, so that the flow of gas on the air passage 5 can be improved. For example, by providing the stator vane 122 on the air passage 5, the static pressure on the low flow rate side is improved. Also, by providing the stator vane 122 on the air passage 5, the number of parts can be reduced, and the cost of parts can be reduced and the weight can be reduced. Also, by using the stator vane as a wing-shaped connecting part, the cross-sectional shape in the radial direction changes, and the rigidity of the part connecting the holder 121 and the housing 10 increases, so that, for example, vibrations generated by driving the motor 40 can be made less likely to be transmitted to the housing 10. Also, it becomes possible to integrally mold the holder 121, the stator vane 122, and a part of the housing 10, and the productivity of the rotating device 1 can be improved.

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

[0036] Moreover, 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 a first end side of the housing 10A and fixed to the cylindrical portion 12. The cover 11A is formed in a circular shape when viewed from the rotation axis direction. The cover 11A includes a ceiling portion 110A and an opening 115.

[0039] The ceiling portion 110A is formed at a position facing the impeller 20 housed in the housing 10A in the rotation axis direction when the cover 11A is assembled to the tubular portion 12. As shown in Figs. 10 and 11, the ceiling portion 110A has no irregularities and has a base (flat portion formed flat in the radial direction perpendicular to the rotation axis direction). The base 116 is formed over the entire circumference of the ceiling portion 110A. The base 116 is formed at 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. Since the ceiling portion 110A has no irregularities, it is possible to suppress the accumulation of dust and the like in, for example, the recessed portion on the outside. Furthermore, the absence of irregularities in the ceiling portion 110A can improve the durability of a mold required for molding the cover 11A.

[0040] Although the embodiment and the modified examples of the present invention have been described above, the present invention is not limited to the above embodiment and modified examples, and various modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, 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, but is not limited to this, and may have a rectangular shape, a V-shape, or a U-shape. In addition, the recess 24b is formed so as to be recessed from the wall end 24a of the wall 24 toward the second direction side in the rotation axis direction, but 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 is not limited thereto. For example, the impeller 20 may be formed of a synthetic resin having mechanical properties such as strength and heat resistance equivalent to or greater than those of a metal. In addition, the impeller 20 is formed with an annular wall portion 24 extending from the outer circumferential end of the top surface portion 23 toward the first end side (first direction in the rotation axis direction) of the housing 10, 10A, but is not limited thereto. For example, the wall portion 24 may be formed extending from the outer circumferential end of the top surface portion 23 toward the second end side (second direction in the rotation axis direction) of the housing 10, 10A.

[0042] 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 housing 10, 10A and the holder 121 when viewed from the rotation shaft direction, but this is not limited to this. That is, the annular space 3a is located on the air passage 5 of 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 with respect to the stator vanes 122 (downstream of the stator vanes 122).

[0043] Moreover, the present invention is not limited by the above-mentioned embodiment. The present invention also includes a configuration in which the above-mentioned components are appropriately combined. For example, when 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) of the rotation axis direction, the holder 121 and the housing 10 may be connected by the stator vanes 122 and spokes, etc., and the annular space portion 3a may not be formed downstream of the stator vanes 122. Also, when the holder 121 and the housing 10 are connected only by the stator vanes 122, and the annular space portion 3a is formed downstream of the stator vanes 122, the impeller 20 may not have the annular wall portion 24. Further effects and modifications can be easily derived by a person skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-mentioned embodiment, and various modifications are possible. [Explanation of symbols]

[0044] 1,1A rotating device, 10,10A housing, 11,11A cover, 12 cylinder portion, 20 impeller, 21 base, 22 blade, 23 top surface portion, 24 wall portion, 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 cover that covers the impeller; Equipped with the cover 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 on the base side in a rotation axis direction, the first recess being recessed in a first direction; a second recess formed in a surface of the second recess on the base side in a rotation axis direction, the second recess being recessed in a first 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, The inner peripheral end of the top surface portion extends in the direction of the rotation axis, The outer circumferential end 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 a radial direction, An inner peripheral end of the top surface portion is received in the first recess, The outer circumferential edge of the top surface portion is accommodated in the second recess. Rotating equipment.

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

3. a housing that accommodates the impeller and the motor; The rotating device according to claim 1 , wherein the housing includes the cover and a cylindrical portion that covers the motor.

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