Rotary device

Abstract

The present application provides a rotating device capable of easily adjusting the weight of an impeller and suppressing the increase in size and cost. A rotating device (1) according to an embodiment includes a shaft (30) as a rotating shaft, an impeller (20) having a base (21), a plurality of blades (22) provided to the base (21), and a top surface portion (23) opposite to the base (21), and a motor (40). An annular wall portion (24) extending in the direction of the rotating shaft is formed at the outer peripheral end of the top surface portion (23). A recess (24b) is formed in the annular wall portion (24).

Description

Technical Field

[0001] This invention relates to rotating devices. Background Technology

[0002] Previously, some vacuum cleaners and other appliances have incorporated rotating devices using centrifugal fans (impellers). Centrifugal fans rotate at high speeds, and therefore, even slight weight variations can cause vibrations during high-speed rotation. Consequently, it is necessary to adjust the weight balance of the centrifugal fan (for example, see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2000-154797

[0004] However, when adjusting the weight balance of the centrifugal fan disclosed in Patent Document 1, for example, a negative balance can be achieved by cutting a portion of the outer periphery of the front surface plate constituting the centrifugal fan, but this may require increasing the outer diameter of the front surface plate, resulting in a larger overall size of the centrifugal fan. Furthermore, if the front surface plate is made thicker, the weight of the centrifugal fan may increase, leading to higher costs. Summary of the Invention

[0005] This invention will provide a rotating device that allows for easy adjustment of the impeller weight and mitigates the problems of large size and increased cost as an example of the subject matter.

[0006] One aspect of the present invention relates to a rotating device comprising: a rotating shaft; an impeller having a base, a plurality of blades disposed on the base, and a top portion opposite to the base; and a motor. An annular wall extending in the direction of the rotating shaft is formed at the outer peripheral end of the top portion. A recess is formed in the annular wall.

[0007] According to one embodiment of the invention, the weight of the impeller can be easily adjusted, and the issues of increasing size and cost can be mitigated. Attached Figure Description

[0008] Figure 1 This is a perspective view of the rotating device involved in the implementation method.

[0009] Figure 2 yes Figure 1 A partially exploded perspective view of the rotating device shown.

[0010] Figure 3 It means Figure 2 The diagram shows a three-dimensional view of the impeller structure.

[0011] Figure 4 It means Figure 2 The diagram shows a side view of the impeller structure.

[0012] Figure 5This is a cross-sectional view showing the internal structure of the rotating device involved in the embodiment.

[0013] Figure 6 It means Figure 5 A partially enlarged sectional view of the internal structure of the main parts of the rotating device shown.

[0014] Figure 7 It means Figure 1 A three-dimensional view of the structure of the cylindrical section is shown.

[0015] Figure 8 It means to be housed in Figure 1 A perspective view of the structure of the motor inside the rotating device shown.

[0016] Figure 9 This is a partial perspective view showing the appearance of the rotating device involved in the modified embodiment.

[0017] Figure 10 It means Figure 9 A partial cross-sectional view of the internal structure of the rotating device shown.

[0018] Figure 11 It means Figure 9 A partially enlarged sectional view of the internal structure of the main parts of the rotating device shown.

[0019] Explanation of reference numerals in the attached figures

[0020] 1, 1A… Rotating equipment; 10, 10A… Shell; 11, 11A… Cover; 12… Cylinder; 20… Impeller; 21… Base; 22… Blade; 23… Top surface; 24… Wall; 24b… Recess; 30… Shaft; 40… Motor; 121… Support. Detailed Implementation

[0021] Hereinafter, the rotating device according to the embodiments will be described with reference to the accompanying drawings. However, the present invention is not limited by these embodiments. Furthermore, the dimensional relationships and ratios of the elements in the drawings may differ from reality. There may also be parts in the drawings with different dimensional relationships or ratios. In addition, the content described in one embodiment or modification is generally applicable to other embodiments and modifications as well.

[0022] (Implementation Method)

[0023] Figure 1 This is a perspective view of the rotating device involved in the implementation method. Figure 2 yes Figure 1 A partially exploded perspective view of the rotating device shown. Figure 3 It means Figure 2 The diagram shows a three-dimensional view of the impeller structure.

[0024] Figure 4 It means Figure 2 The diagram shows a side view of the impeller structure. Figure 5 This is a cross-sectional view showing the internal structure of the rotating device involved in the embodiment. Figure 6 It means Figure 5 A partially enlarged sectional view of the internal structure of the main parts of the rotating device shown. Figure 7 It means Figure 1 A three-dimensional view of the structure of the cylindrical section is shown. Figure 8 It means to be housed in Figure 1 A perspective view of the structure of the motor inside the rotating device is shown. Furthermore, Figure 2 Indicates from Figure 1 The rotating device shown is in the state where the cover has been removed. Figure 6 yes Figure 5 An enlarged view of part A in the image.

[0025] Furthermore, the Z direction shown in the illustration is defined as the rotation axis direction of the rotating device in this embodiment. Among the rotation axis directions, Z1 is defined as the first direction, and Z2 as the second direction. Additionally, the direction orthogonal to the rotation axis direction of the rotating device in this embodiment is defined as radial. Within the radial direction, the direction moving away from the axis X is defined as radially outward, and the direction moving towards the axis X is defined as radially inward. The axis X shown in the illustration extends in the same direction as the rotation axis direction.

[0026] Figure 1 The rotating device 1 shown is, for example, embedded in a vacuum cleaner, suction machine, etc. Figure 5 As shown, the rotating device 1 includes a housing 10, an impeller 20, a shaft 30, a motor 40, and a base plate 50.

[0027] The housing 10 houses at least the impeller 20, shaft 30, and motor 40 internally, and is partially formed by a base plate 50. The housing 10 is cylindrical and has two internal spaces 2 and 3, with a ventilation passage 5 formed on its inner side. A portion of the ventilation passage 5 is formed by the two spaces 2 and 3. Space 2 is the internal space of the housing 10 that houses at least the impeller 20. Space 3 is the internal space of the housing 10 that communicates with space 2 and houses at least the motor 40. With the base plate 50 assembled to the cylindrical portion 12, space 3 communicates with the external space via an opening 120a. In other words, the ventilation passage 5 communicates with the outside of the housing 10 via the opening 120a. The housing 10 includes a cover 11 and a cylindrical portion 12. The housing 10 has two ends in the direction of rotation. The end in the first direction is referred to as the first end, and the other end in the second direction is referred to as the second end.

[0028] like Figure 1 , Figure 2 as well as Figure 5 As shown, the cover 11 is the portion that covers the impeller 20 housed in the housing 10. The cover 11 is part of the housing 10 and is disposed on the first end side of the housing 10 in the direction of rotation axis. That is, the cover 11 is assembled to the cylindrical portion 12 in the first direction. When viewed from the direction of rotation axis, the cover 11 is formed into a circular shape. The cover 11 is formed, for example, from synthetic resin. The cover 11 has: a top 110; and an opening 115 that opens toward the first direction.

[0029] With the cover 11 assembled to the cylindrical portion 12, the top 110 is formed in the direction of rotation at a position opposite to the impeller 20 housed in the housing 10. The top 110 has a plurality of protrusions and recesses. For example... Figure 5 and Figure 6 As shown, the cylindrical portion 12 side surface of the top 110 has recesses 111 and 112 that are recessed in the first direction in the direction of rotation axis. Recesses 111 and 112 are both formed into a groove shape covering the entire circumference of the top 110. A portion of the impeller 20 housed in the housing 10 is housed within the recesses 111 and 112. Recesses 111 and 112 are connected by a connecting portion 113 constituting the top 110. The connecting portion 113 is formed convex in the second direction in the direction of rotation axis relative to the bottom surface 111a of recess 111 and the bottom surface 112a of recess 112. The connecting portion 113 is formed covering the entire circumference of the top 110.

[0030] The opening 115 is a through hole that extends through the top 110 in the direction of the rotation axis. When viewed from the direction of the rotation axis, the opening 115 is circular. The opening 115 is located at the center of the top 110 through which the axis X passes. The space 2 communicates with the external space via the opening 115. The opening 115 serves as the intake port for gas in the rotating device 1.

[0031] like Figure 5As shown, the cylindrical portion 12 covers the motor 40 housed within the housing 10. The cylindrical portion 12 is formed in a cylindrical shape. The cylindrical portion 12 is formed, for example, from synthetic resin. Alternatively, the cylindrical portion 12 may be formed from a metal material such as aluminum alloy. The cylindrical portion 12 supports the shaft 30 for free rotation via bearings 125 and 126, and holds the motor 40 housed inside. The bearing 125 is disposed inside the bracket 121. The bearing 126 is disposed on the frame 123, which supports the motor 40 in a second direction along the rotation axis. That is, the bearing 126 is supported by the frame 123. The cylindrical portion 12 has: an annular wall portion (peripheral wall portion) 120 surrounding the motor 40; a bracket 121 supporting the motor 40 inside the peripheral wall portion 120; and a plurality of stationary blades 122 connecting the bracket 121 and the peripheral wall portion 120. Additionally, the bracket 121 includes: a frame 123 supporting a portion of the motor 40 located at the second end of the housing 10; a bearing 126 supported by the frame 123; and a cover 127 located at the first end of the housing 10 relative to the frame 123. Furthermore, the bracket 121 is disposed at the second end of the housing 10 relative to the impeller 20.

[0032] The peripheral wall portion 120 is formed in a cylindrical shape. A cover 11 is assembled at the end of the peripheral wall portion 120 located at the first end of the housing 10. The end of the peripheral wall portion 120 located at the second end of the housing 10 in the direction of rotation has three openings 120a. The three openings 120a are formed at constant intervals in the circumferential direction. The openings 120a in the cylindrical portion 12 are formed to open radially. In other words, the openings 120a that open radially are formed from the cylindrical portion 12 toward the outside. The openings 120a are formed to be recessed from the second end of the peripheral wall portion 120 toward the first end in the direction of rotation. When viewed from the outside, the openings 120a are formed to be approximately rectangular in the radial direction.

[0033] like Figure 5 , Figure 7As shown, viewed from the direction of the rotation axis, the support 121 is disposed inside the cylindrical portion 12 and is formed into a generally cylindrical (hollow) shape. The support 121 is radially connected to the peripheral wall portion 120 via a plurality of stationary blades 122. The support 121 holds the motor 40. The support 121 is connected to the stator 42 of the motor 40 inside the housing 10. The support 121 has a frame 123 suspended relative to the cover portion 127 at the second end side of the housing 10 via three columns (supports) 130. The support 121 supports a portion (bottom) of the motor 40 located at the second end side of the housing 10 via the frame 123 in the direction of the rotation axis. The motor 40 is held in the direction of the rotation axis by the cover portion 127 and the frame 123 in such a way that the motor 40 is clamped between the frame 123 and the cover portion 127. The support 121 is disposed relative to the frame 123 on the side of the stationary blades 122. The bracket 121 has a through hole 121a at its central portion through which the axis X passes, for the shaft 30 to be inserted. The bracket 121 supports the shaft 30 for free rotation via bearings 125 and 126. Viewed from the direction of the rotation axis, the bracket 121 forms an annular space 3a between the bracket 121 and the housing 10. The annular space 3a constitutes part of the aforementioned space 3, but is located between space 2 and space 3 in the direction of the rotation axis. The annular space 3a is located on the ventilation path 5 for the gas flowing from the impeller 20 to the motor 40 side, and is located downstream of the stationary blade 122. Figure 5 As shown, the ventilation passage 5 is a passage through which gas passes within the housing 10 by the rotation of the impeller 20. The ventilation passage 5 is formed on the outer periphery of the motor 40 along the direction of rotation and is capable of cooling the motor 40.

[0034] Multiple stationary blades 122 connect the peripheral wall portion 120 and the support 121 radially. The multiple stationary blades 122 also serve as connecting portions. The multiple stationary blades 122 are formed by extending radially from the inner circumferential surface of the peripheral wall portion 120 toward the inner side (support 121) and connecting to the outer circumferential surface of the support 121. The multiple stationary blades 122 are arranged at constant intervals along the circumferential direction. Each of the multiple stationary blades 122 has a blade shape, and its cross-sectional shape, viewed radially, has a shape that is inclined from one side to the other in the circumferential direction. The multiple stationary blades 122 support the support 121 to the housing 10. When viewing the support 121 from the direction of rotation axis, a gap for gas passage is provided between adjacent stationary blades 122 in the circumferential direction. The gap formed by the multiple stationary blades 122 connects the space portion 2 and the space portion 3, forming part of the ventilation passage 5.

[0035] like Figures 2-4 As shown, the rotating device in this embodiment includes an impeller 20, forming a so-called centrifugal fan. The impeller 20 is formed, for example, from a metal component such as aluminum alloy or stainless steel, or from a resin component. Figure 5As shown, the impeller 20 is housed in the space 2 formed by the cover 11 and the cylinder 12. The impeller 20 is driven by the motor 40, for example... Figure 2 The impeller 20 rotates in the R direction as shown. It is fixed to a shaft 30 extending in the direction of the rotation axis of the motor 40, and rotates about the axis X as a center axis driven by the motor 40, generating airflow radially outward from the direction of the rotation axis. In this embodiment, the impeller 20 has a base 21, multiple blades 22, and a top surface 23.

[0036] The base 21 is formed, for example, in the shape of a circular plate. The base 21 has a through hole 21a in the central portion through which the axis X passes, through which the shaft 30 is inserted. The base 21 is fastened relative to the shaft 30 inserted into the through hole 21a by fastening components such as bolts.

[0037] Multiple blades 22 connect the base 21 and the top surface 23 in the direction of rotation axis. Each blade 22 is formed by extending from the base 21 toward a first end (in a first direction) of the housing 10 and connecting to the top surface 23. All blades 22 have identical cross-sectional shapes when viewed from the direction of rotation axis. Each blade 22 has a cross-section that is curved and inclined rearward relative to the direction of rotation. For example, a blade 22 is a blade that is rearward relative to the direction of rotation.

[0038] When viewed from the direction of the rotation axis, the top surface 23 is formed in a ring shape. For example... Figure 5 , Figure 6 As shown, the top surface 23 has a U-shaped cross-sectional shape that is recessed towards the second end (in the second direction) of the housing 10 when viewed radially. The top surface 23 has an annular wall portion 24 and an opening portion 25.

[0039] The wall portion 24 is formed by extending from the outer peripheral end of the top portion 23 toward the first end (in the first direction) of the housing 10 in the direction of rotation axis. The wall portion 24 is formed orthogonal or substantially orthogonal to the base (hereinafter referred to as the flat portion) 23a of the top portion 23. The flat portion 23a of the top portion 23 extends radially orthogonal to the direction of rotation axis. The wall portion 24 is preferably formed by extending from the outer peripheral end of the top portion 23 in a direction different from the second direction in the direction of rotation axis. For example, the wall portion 24 is preferably formed so that it is not radially opposed to the plurality of blades 22. Figure 5 and Figure 6As shown, with the cover 11 assembled to the cylindrical portion 12, the wall portion 24 is housed inside the recess 111. With the cover 11 assembled to the cylindrical portion 12, the wall portion 24 is formed such that the wall end portion 24a on the first direction side faces the bottom surface 111a of the recess 111. With the cover 11 assembled to the cylindrical portion 12, the wall portion 24 has a gap I between itself and the bottom surface 111a of the recess 111. The wall portion 24 has a gap I of a certain length between itself and the recess 111 so that it does not contact the inner circumferential surface of the recess 111 due to the centrifugal force generated by the high-speed rotation of the impeller 20. The wall portion 24 sometimes forms a recess 24b. That is, for the impeller 20 in this embodiment, the wall portion 24 has a portion that can adjust the rotational balance through negative balance.

[0040] The recess 24b is formed to be recessed from the wall end 24a of the wall portion 24 toward the second end of the housing 10 (in the second direction toward the rotation axis). For example... Figure 4 As shown, the recess 24b has a semi-circular shape that curves towards the second direction when viewed radially. For example, the recess 24b may be provided at multiple locations, not just one around the wall portion 24.

[0041] The opening 25 is a through hole that penetrates the top portion 23 in the direction of rotation axis. Viewed from the direction of rotation axis, the opening 25 is circular. The opening 25 is located at the center of the top portion 23 through which the axis X passes. The opening 25 serves as the intake port for gas in the impeller 20. The inner circumferential end of the opening 25 extends toward the first end of the housing 10 (in the first direction toward the direction of rotation axis). With the cover 11 assembled to the cylinder portion 12, the inner circumferential end of the opening 25 is received inside the recess 112. The height of the inner circumferential end of the opening 25 in the direction of rotation axis can be arbitrary, but is preferably equal to or greater than the height of the wall portion 24 in the direction of rotation axis.

[0042] The shaft 30 is cylindrical and extends in the direction of rotation, and is rotatably supported on the housing 10. The shaft 30 is made of a metal material such as stainless steel. The shaft 30 forms part of the rotor 41 described later. With the motor 40 held in the bracket 121, the shaft 30 is inserted through the through hole 121a of the bracket 121 to fix the impeller 20. The shaft 30 is rotatably supported on bearings 125 and 126.

[0043] Motor 40 rotates impeller 20 around a rotation axis, i.e., axis X. Motor 40 rotates impeller 20 via shaft 30. Motor 40 is housed in space 3 formed by cylindrical portion 12 and base plate 50. Motor 40 is held by frame 123 suspended from cover portion 127 via column 130. Motor 40 has rotor 41 and stator 42. Rotor 41 is formed of a magnetic body with magnets and rotates relative to stator 42 around rotation axis, i.e., axis X. Figure 8 As shown, the stator 42 is composed of a stator core 42a, an insulator 42b, and a coil 42c. The stator core 42a is formed by stacking multiple electromagnetic steel plates (multiple magnetic bodies). The coil 42c is formed by winding a wire through the insulator 42b.

[0044] The substrate 50 is supported on the housing 10 and fixed to the second end of the cylindrical portion 12 to seal the opening on the second direction side of the cylindrical portion 12. With the substrate 50 fixed to the housing 10, it is positioned relative to the motor 40 at the second end of the housing 10. The substrate 50 is electrically connected to the motor 40 via a connection terminal (not shown). The substrate 50 is formed, for example, from an insulating resin component such as epoxy. The substrate 50 is positioned opposite the motor 40 in the rotation axis direction. 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 located outside the rotating device 1, converting the power supplied from the power source into drive power and supplying it to the motor 40. Electronic components (not shown) are disposed on the substrate 50. These electronic components include, for example, a frequency converter and a control IC. The external power source can be, for example, an industrial power source or a battery.

[0045] Next, the operation of the rotating device 1 will be explained. The motor 40 is driven by current flowing from the substrate 50, causing the shaft 30 to rotate about the axis X. Simultaneously with the rotation of the shaft 30, the impeller 20 begins to rotate. Due to the rotation of the impeller 20, gas is drawn in through the opening 25 provided on the top surface 23 and flows along the ventilation path 5, passing through the gap between adjacent blades 22, i.e., between the base 21 and the top surface 23, and is discharged radially outward. As the impeller 20 rotates, gas flowing in from the opening 115 of the cover 11 passes through the gap formed by the plurality of blades 22 and is discharged to the outside of the impeller 20. The gas discharged to the outside of the impeller 20 flows along the inner circumference of the cover 11 in the second direction, passes through the gap formed by the plurality of stationary blades 122, and flows into the space 3. The gas flowing into the space 3 is discharged directly to the outside through the opening 120a, or indirectly to the outside by colliding with the substrate 50 and passing through the opening 120a.

[0046] As described above, one embodiment of the rotating device 1 according to the present invention includes: a shaft 30; an impeller 20; and a motor 40, which rotates the impeller 20 about the shaft 30. The impeller 20 has an annular wall portion 24 extending from the outer peripheral end of the top portion 23 toward one side in the direction of the rotation axis. The wall portion 24 has a recess 24b. In this way, by forming the recess 24b in the wall portion 24, a negative balance of the impeller 20 can be achieved, and the weight adjustment of the impeller 20 becomes easy. As described above, it is not necessary to increase the outer diameter of the front surface plate constituting the impeller or to make the front surface plate thick, thus it is possible to suppress the increase in size of the rotating device 1 and the increase in cost due to the increase in materials.

[0047] Furthermore, as described above, one embodiment of the rotating device 1 according to the present invention includes: an impeller 20; a motor 40 that rotates the impeller 20 about a rotation axis; and a cylindrical housing 10 that houses at least the impeller 20 and the motor 40. The housing 10 has: a support 121 that holds the motor 40; and a plurality of stationary blades 122 connected to and linked to the support 121. The support 121 is connected to the stator 42 of the motor 40 inside the housing 10. Viewed from the direction of the rotation axis, the support 121 forms an annular space 3a between the support 121 and the housing 10. The annular space 3a is located on a ventilation path 5 for gas flowing from the impeller 20 to the motor 40, and is located at the second end of the housing 10 relative to the stationary blades 122, forming a part of the ventilation path 5. In this way, by connecting the support 121 and the housing 10 with the stationary blade 122, the rotating device 1 has a structure in which the stationary blade 122 is present in the ventilation passage 5 inside the housing 10, and no obstructions (such as spokes) are found to hinder the flow of gas, thus improving the flow of gas in the ventilation passage 5. For example, by providing the stationary blade 122 in the ventilation passage 5, the static pressure on the low flow side is improved. In addition, by providing the stationary blade 122 in the ventilation passage 5, the number of components is reduced, and component costs can be reduced and the device can be made lighter. Furthermore, the connection part, i.e., the stationary blade, is blade-shaped, and the radial cross-sectional shape change increases the rigidity of the part connecting the support 121 and the housing 10, for example, making it difficult for vibrations caused by the drive of the motor 40 to be transmitted to the housing 10. In addition, the support 121, the stationary blade 122, and a part of the housing 10 can be integrally formed, which can improve the productivity of the rotating device 1.

[0048] Furthermore, in one embodiment of the rotating device 1, the impeller 20 is formed of a metallic material. This increases the strength compared to an impeller made of resin, for example, improving durability during high-speed rotation.

[0049] Furthermore, in one embodiment of the rotating device 1, the ventilation passage 5 communicates with the outside of the housing 10 via at least one opening 120a formed radially in the cylindrical portion 12. Thus, gas passing through the ventilation passage 5 is discharged from the space portion 3 to the outside via the opening 120a, thereby enabling efficient and easy discharge of gas drawn into the housing 10.

[0050] (Modifications of the implementation method)

[0051] Figure 9 This is a partial perspective view showing the appearance of the rotating device involved in the modified embodiment. Figure 10 It means Figure 9 A partial cross-sectional view of the internal structure of the rotating device shown. Figure 11 It means Figure 9A partially enlarged sectional view of the internal structure of the main parts of the rotating device shown. Furthermore, Figure 11 yes Figure 10 Enlarged view of part B in the image.

[0052] The rotating device 1A in the modified embodiment differs from the above embodiment in that the top 110A of the cover 11A does not have recesses 111 and 112. The housing 10A includes a cover 11A and a cylindrical portion 12. The cover 11A is disposed at the first end side of the housing 10A and fixed to the cylindrical portion 12. When viewed from the direction of the rotation axis, the cover 11A is formed into a circular shape. The cover 11A has a top 110A and an opening 115.

[0053] With the cover 11A assembled to the cylinder 12, the top 110A is formed in the direction of rotation at a position opposite to the impeller 20 housed in the housing 10A. Figure 10 and Figure 11 As shown, the top 110A does not have any irregularities, but has a base (a flat portion formed radially orthogonal to the rotation axis) 116. The base 116 is formed throughout the circumference of the top 110A. When the cover 11A is assembled to the cylinder 12, the base 116 is formed radially opposite the flat portion 23a of the impeller 20. Since the top 110A does not have any irregularities, it is possible to suppress the accumulation of dust in the outer recesses, for example. In addition, the absence of irregularities in the top 110A improves the durability of the metal mold required for molding the cover 11A.

[0054] The embodiments and modifications of the present invention have been described above, but the present invention is not limited to the above embodiments and modifications. Various modifications can be made without departing from its spirit. For example, in the above embodiment, the recess 24b has a semi-circular shape that curves toward the second end (second direction) of the housing 10, 10A when viewed radially, but it is not limited to this; it may also be rectangular, V-shaped, or U-shaped. Furthermore, the recess 24b is formed to be recessed from the wall end 24a of the wall portion 24 toward the second direction of the rotation axis, but it is not limited to this; it may also be a through hole penetrating the wall portion 24. In this case, the through hole formed in the wall portion 24 is not cut from the wall end 24a, but is circular.

[0055] Furthermore, in the above embodiment, the impeller 20 is formed of a metallic material, but it is not limited to this. For example, the impeller 20 may also be formed of a synthetic resin with mechanical properties such as strength and heat resistance that are equal to or greater than those of metal. Additionally, the impeller 20 has an annular wall portion 24 extending from the outer peripheral end of the top surface portion 23 toward the first end side (first direction of the rotation axis) of the housings 10, 10A, but it is not limited to this. For example, the wall portion 24 may also be formed by extending from the outer peripheral end of the top surface portion 23 toward the second end side (second direction of the rotation axis) of the housings 10, 10A.

[0056] Furthermore, in the above embodiment, the support 121 is connected to the stator 42 of the motor 40 inside the housings 10 and 10A. When viewed from the direction of the rotation axis, an annular space 3a is formed between itself and the housings 10 and 10A, but this is not a limitation. That is, the annular space 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 of the stationary blade 122, but this is not a limitation. For example, multiple spokes connecting the support 121 and the housings 10 and 10A may be formed on the second end side of the housings 10 and 10A (downstream of the stationary blade 122) relative to the stationary blade 122.

[0057] Furthermore, the present invention is not limited to the above embodiments. Technical solutions constituted by appropriately combining the above-described structural elements are also included in the present invention. For example, when the impeller 20 has an annular wall portion 24 extending from the outer peripheral end of the top portion 23 toward one side (first direction or second direction) or both sides (first direction and second direction) in the direction of rotation, the support 121 and the housing 10 may be connected by stationary blades 122 and spokes, etc., and an annular space portion 3a may not be formed on the downstream side of the stationary blades 122. Alternatively, when the support 121 and the housing 10 are connected only by stationary blades 122, and an annular space portion 3a is formed on the downstream side of the stationary blades 122, the impeller 20 may not have an annular wall portion 24. Furthermore, further effects and modifications can be readily derived by those skilled in the art. Therefore, the broader forms of the present invention are not limited to the above-described embodiments, and various modifications are possible.

Claims

1. A rotating device, comprising: Rotation axis; An impeller has a base, an annular top surface having an outer peripheral end opposite to the outer peripheral end of the base, and a plurality of blades connecting the base and the top surface. Motor; and A cover, covering the impeller, The inner peripheral end of the top surface extends along the axis of rotation. An annular wall extending in the direction of rotation is formed at the outer peripheral end of the top surface. A portion of the cover located between the inner circumferential end of the top surface and the annular wall portion protrudes toward the top surface in the direction of rotation axis. The annular wall portion faces the inner circumference of a portion of the cover in the radial direction. In the direction of rotation axis, a recess is formed at a portion of the end of the annular wall portion. The shape of the recess, viewed radially, is a shape that is recessed relative to the other parts of the end of the annular wall.

2. The rotating device according to claim 1, The impeller is formed from metal or resin components.

3. The rotating device according to claim 1, The cover has a first recess and a second recess extending in the circumferential direction. The inner peripheral end of the top surface is received in the first recess of the cover. The end of the annular wall portion is received in the second recess of the cover.

4. The rotating device according to claim 3, The rotating device includes a housing having the cover and a cylindrical portion covering the motor. The shape of the recess, viewed radially, is a shape that is recessed towards the housing.

5. The rotating device according to claim 4, The housing has a first end and a second end located on the side of the cover in the direction of rotation axis. The rotating device includes a base plate disposed on the second end side of the housing relative to the motor.

6. The rotating device according to any one of claims 1 to 3, The rotating device includes a housing, the housing having a cylindrical portion for housing the motor. The motor has: a rotor fixed to the rotating shaft, and a stator surrounding the rotor. The housing has: a support for holding the stator, a stationary blade connecting the cylindrical portion and the support, and an annular space formed between the cylindrical portion and the support.

Images