CN210629230U - Stator unit, motor, and blower - Google Patents

Abstract

Provided are a stator unit, a motor, and an air blowing device, wherein the stator unit comprises: a stator that can drive a rotor that can rotate around a central axis; a cover member having a cover cylinder shape, which accommodates at least an upper portion of the stator; a filling part filled between the cover member and the stator at least in the cover member; a covered cylindrical bracket part covering the lower end part of the cylindrical part; an extension portion extending in an axial direction from an end portion of one of the cylindrical portion of the cover member and the outer wall portion of the bracket portion, the one axial side being directed from the one axial portion toward the other axial portion; and a convex portion protruding inward from an inner side surface of the other of the cylindrical portion and the outer wall portion. The extending portion has a stopper portion provided at a position on one side in the axial direction than the protruding portion. The stopper portion is in contact with the convex portion in the axial direction, or the stopper portion is opposed to the convex portion in the axial direction.

Description

Stator unit, motor, and blower

Technical Field

The utility model relates to a stator unit, motor and air supply arrangement.

Background

In order to improve the waterproof property of the stator, the following techniques are known: the stator is covered with a cover member having a cover cylinder shape and a bracket portion covering an opening portion of the cover member. For example, japanese patent application laid-open No. 2007-174896 discloses a motor in which a stator is completely covered by joining a housing that houses the stator and a base. The housing is joined to the base by a screwing method, a fitting method, or the like. After the bonding, the gap of the base is filled with the filling material between the housing and the base.

Patent document 1: japanese laid-open patent publication No. 2007-174896

However, if a force acts on the housing (corresponding to the cover member) before the filler is cured, the housing may float in a direction away from the base (corresponding to the bracket portion). Thus, the housing may be detached from the base.

SUMMERY OF THE UTILITY MODEL

The utility model aims to prevent the cover component from separating from the bracket part.

The exemplary stator unit of the present invention has: a stator that can drive a rotor that can rotate around a central axis line extending in a vertical direction; a cover member having a cylindrical shape with a cover and a cylindrical portion extending in an axial direction, the cover member accommodating at least an upper portion of the stator; a filling part filled between the cover member and the stator at least inside the cover member; a bracket portion which is in a covered cylinder shape, has a cylindrical outer wall portion extending along the axial direction, and covers the lower end portion of the cylinder portion; an extension portion that extends in an axial direction from an end portion on one axial side of one of the cylindrical portion and the outer wall portion, the one axial side being directed from the one axial side toward the other axial side; and a convex portion that protrudes inward from an inner side surface of the other of the tube portion and the outer wall portion. The extension portion has a stopper portion provided on one side in the axial direction of the projection portion. The stopper portion is in contact with the convex portion in the axial direction, or the stopper portion is opposed to the convex portion in the axial direction.

In the above stator unit, the stopper portion and the convex portion may be axially opposed to each other, and a part of the filling portion may be provided between the stopper portion and the convex portion in the axial direction.

In the stator unit, a lower end portion of the cylindrical portion and an upper end portion of the outer wall portion are in contact with each other in the axial direction.

In the stator unit, the cover member further includes a wall portion extending downward from a lower end of the cylindrical portion, and the wall portion is in contact with a side surface of the outer wall portion via an elastic member in a radial direction.

In the above stator unit, the elastic member is any of an adhesive having elasticity and an elastic rubber.

In the stator unit, the bracket portion may further include a lower cover portion covering a lower end portion of the outer wall portion, the protruding portion may be provided on the outer wall portion, a hole portion penetrating the lower cover portion in the axial direction may be provided in the lower cover portion, and the hole portion may overlap the entire protruding portion as viewed in the axial direction.

In the above stator unit, the stopper portion and the convex portion are provided in plurality at equal intervals in the circumferential direction.

In addition, an exemplary motor of the present invention includes: a rotor that is rotatable about a central axis extending in a vertical direction; and the stator unit having a stator capable of driving the rotor.

In addition, an exemplary air supply device of the present invention includes: the above-mentioned motor; and a blade portion that is rotatable about a central axis line extending in the vertical direction together with the rotor of the motor.

According to the exemplary stator unit, motor, and blower of the present invention, the cover member can be prevented from being detached from the bracket portion.

Drawings

Fig. 1 is a sectional view showing a configuration example of an air blowing device according to an embodiment.

Fig. 2 is an enlarged view of the vicinity of the retaining portion of the air blowing device of the embodiment.

Fig. 3 is a perspective view showing the inside of the bracket portion of the embodiment.

Fig. 4 is a perspective view showing a lower surface of the bracket portion of the embodiment.

Fig. 5 is a sectional view showing a partial structural example of the vicinity of the retaining portion in modification 1.

Fig. 6 is a perspective view showing the inside of the bracket portion of modification 2.

Description of the reference symbols

100: an air supply device; 200: a blade section; 300: a housing; 301: a housing tube section; 302: a spoke portion; 1: a motor; 10: a rotor; 11: a shaft; 12: a shaft holder; 13: a holding member; 131: a rotor cover portion; 132: a rotor main body portion; 14: a yoke; 15: a magnet; 20: a stator unit; 21: a stator; 211: a stator core; 212: an insulating member; 213: a coil section; 30: a cover member; 31: a barrel portion; 311: a cover main body portion; 312: a flange portion; 312 a: a through hole; 313: a cover outer wall portion; 32: a cover portion; 33: a wall portion; 40: a substrate; 50: a filling section; 60: a bracket part; 61: a lower cover portion; 61 a: a through hole; 61 b: a hole portion; 62: a bearing holder holding portion; 63: an outer wall portion; 63 a: a bracket recess; 63 b: a peripheral wall portion; 63 c: a groove part; 631: an elastic member; 71: a bearing retainer; 710: a bearing; 72: a cap portion; 80: an anti-drop part; 81: an extension portion; 81 a: an opening; 81 b: a stopper portion; 82: a convex portion; CA: a central axis.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.

In the present specification, a direction parallel to the center axis CA in the blower 100 is referred to as an "axial direction". In the axial direction, a direction from a later-described cap 72 toward the shaft holder 12 is referred to as "upper", and a direction from the shaft holder 12 toward the cap 72 is referred to as "lower". The upper end of each component is referred to as an "upper end", and the position of the upper end in the axial direction is referred to as an "upper end". The lower end is referred to as a "lower end", and the position of the lower end in the axial direction is referred to as a "lower end". Among the surfaces of the respective components, the surface facing upward is referred to as "upper surface", and the surface facing downward is referred to as "lower surface".

In addition, a direction perpendicular to the center axis CA is referred to as a "radial direction". A direction approaching the center axis CA in the radial direction is referred to as "inner side", and a direction away from the center axis CA is referred to as "outer side". The inner end of each component is referred to as an "inner end", and the position of the inner end in the radial direction is referred to as an "inner end". The outer end is referred to as an "outer end", and the position of the outer end in the radial direction is referred to as an "outer end". Among the side surfaces of the respective components, the side surface facing inward is referred to as "inner side surface", and the side surface facing outward is referred to as "outer side surface".

The rotational direction about the center axis CA is referred to as "circumferential direction".

In the present specification, the "annular shape" includes a shape that is continuous and integral without a slit over the entire circumference of the circumference around the central axis CA, and also includes an arc shape having a slit over a part of the entire circumference around the central axis CA.

The above-described names of directions, ends, positions, faces, and the like, and the definition of "ring" are definitions for the names and shapes used in the description of the present specification, and do not limit the names and shapes when assembled into an actual device.

< 1. embodiment >

< 1-1. air supply device

Fig. 1 is a sectional view showing a configuration example of an air blowing device 100 according to an embodiment. Fig. 1 shows a cross-sectional structure of air blower 100 when air blower 100 is cut along a virtual plane including central axis CA.

The blower 100 includes a blade 200 and a motor 1. The vane unit 200 is rotatable about a central axis CA extending in the vertical direction together with a rotor 10 of the motor 1, which will be described later. The motor 1 drives the blade 200 to rotate. The blower 100 generates an airflow flowing in the axial direction by the rotation of the blade 200.

Further, the air blowing device 100 includes a housing 300. The housing 300 includes a housing barrel portion 301 and spoke portions 302. The housing tube 301 has a tubular shape extending in the axial direction. The housing tube 301 houses the motor 1 and the blade unit 200. The housing tube 301 is connected to the lower portion of the motor 1 via spokes 302 at the lower portion in the axial direction of the blower 100. For example, the outer ends of the spoke portions 302 are connected to the inner surface of the housing tube portion 301. The inner end of the spoke 302 is connected to the outer end of a bracket portion 60 of the motor 1, which will be described later. The housing tube 301 supports the motor 1 via the spokes 302.

In the present embodiment, the air blower 100 is an axial fan that sends an airflow in the axial direction, but is not limited to this example. For example, the blower 100 may be a centrifugal fan that sends an airflow in the radial direction.

< 1-2. Motor >

Next, the structure of the motor 1 will be described with reference to fig. 1. The motor 1 has a rotor 10 and a stator unit 20. The rotor 10 is rotatable about a central axis CA extending in the vertical direction. The stator unit 20 includes a stator 21 described later that can drive the rotor 10.

< 1-2-1. rotor >

The rotor 10 includes a shaft 11, a shaft holder 12, a holding member 13, a yoke 14, and a magnet 15.

The shaft 11 is a rotation shaft of the rotor 10. The shaft 11 is rotatable about the center axis CA together with the shaft holder 12, the holding member 13, the yoke 14, the magnet 15, and the blade 200. In addition, the shaft 11 is not limited to this example, and may be a fixed shaft attached to the stator unit 20. In the case where the shaft 11 is a fixed shaft, a bearing is provided between the shaft 11 and the shaft holder 12.

The shaft holder 12 is attached to the shaft 11 at an upper portion in the axial direction of the motor 1. In the present embodiment, the shaft holder 12 is attached to the upper end portion of the shaft 11 and extends outward from the outer side surface of the shaft 11.

The holding member 13 has a lid cylinder shape. The holding member 13 includes a rotor cover portion 131 and a rotor body portion 132. The rotor cover 131 is annular and radially expanded plate-shaped around the center axis CA. The rotor cover 131 covers the upper end of the rotor body 132. The inner end of the rotor cover 131 is connected to the outer end of the shaft holder 12. The rotor body 132 is cylindrical and extends downward from an outer end of the rotor cover 131. A plurality of blade portions 200 are provided on the outer surface of the rotor body 132. The yoke 14 is provided on the inner surface of the rotor body 132.

The yoke 14 is formed in a cylindrical shape extending in the axial direction, and holds the magnet 15. A magnet 15 is provided on the inner surface of the yoke 14.

The magnet 15 is located outside the stator 21 of the stator unit 20 and radially faces the outer surface of the stator 21. The magnets 15 have mutually different magnetic poles. The magnetic poles are alternately arranged in the circumferential direction. The magnet 15 may have a ring shape centered on the central axis CA. Alternatively, the magnet 15 may be a plurality of magnet pieces arranged in the circumferential direction.

< 1-2-2. stator unit >

The stator unit 20 includes the cover member 30, the base plate 40, the filling portion 50, the bracket portion 60, the bearing holder 71, the cap portion 72, the extending portion 81, and the projection 82 in addition to the stator 21 described above. In addition, the stator unit 20 has a retaining portion 80 including an extending portion 81 and a protruding portion 82. The retaining portion 80, the extending portion 81, and the projecting portion 82 will be described later.

The stator 21 is annular about the center axis CA and is supported by a bearing holder 71. As described above, the stator unit 20 has the stator 21. The stator 21 can drive the rotor 10, and the rotor 10 can rotate around a central axis CA extending in the vertical direction. More specifically, the stator 21 drives the rotor 10 to rotate in the circumferential direction when the motor 1 is driven.

The stator 21 includes a stator core 211, an insulator 212, and a plurality of coil portions 213. The stator core 211 is an annular magnetic body centered on the central axis CA, and in the present embodiment, is a laminated body in which a plurality of plate-shaped electromagnetic steel plates are laminated. Stator core 211 is fixed to bearing holder 71. In the present embodiment, the inner end portion of the stator core 211 is fixed to the outer side surface of the bearing holder 71. The outer surface of stator core 211 is radially opposed to magnet 15. The insulator 212 is an insulating member made of a resin material or the like, and covers at least a part of the stator core 211. Each of the plurality of coil portions 213 is a winding member formed by winding a conductive wire around the stator core 211 with an insulator 212 interposed therebetween. The ends of the wires are electrically connected to the substrate 40.

The cover member 30 has a cylindrical shape with a lid, and has a cylindrical portion 31 extending in the axial direction, and the cover member 30 houses at least an upper portion of the stator 21. The cover member 30 further includes a cover portion 32 and a wall portion 33.

The cylinder 31 has a cover body 311 and a flange 312. The cover body 311 extends in the axial direction and covers the outer surface of the stator 21. The flange portion 312 extends outward from the lower end portion of the cover main body portion 311.

The lower end of the cylindrical portion 31 preferably contacts an upper end of an outer wall 63 of the bracket portion 60, which will be described later. In the present embodiment, the lower surface of the flange portion 312 directly contacts the upper end of the outer wall 63 of the bracket portion 60. However, the lower surface of the flange portion 312 is not limited to this example, and may indirectly contact the upper end portion of the outer wall portion 63 via an adhesive or the like. In this way, water and dust can be prevented from entering the stator unit 20 from the outside thereof through the space between the lower end of the cylindrical portion 31 and the upper end of the outer wall portion 63. Further, for example, leakage of the filling portion 50 before curing from the inside to the outside of the stator unit 20 through a gap between the lower end portion of the cylindrical portion 31 and the upper end portion of the outer wall portion 63 can be suppressed. In particular, if the entire lower end of the cylindrical portion 31 axially contacts the upper end of the outer wall portion 63, the entry of water and dust, the leakage of the filler 50 before curing, and the like as described above can be more effectively suppressed.

Next, the lid portion 32 covers the upper end portion of the tube portion 31, particularly the upper end portion of the lid main body portion 311. The outer end of the cover portion 32 is connected to the upper end of the cover body portion 311. The inner end of the cover portion 32 contacts the outer side surface of the bearing holder 71.

As described above, the cover member 30 further includes the wall portion 33. In the present embodiment, the wall portion 33 extends downward from the lower end of the cylindrical portion 31. More specifically, the wall portion 33 protrudes downward from the lower surface of the flange portion 312, and extends in the circumferential direction. In the present embodiment, the circumferential end of the wall portion 33 is connected to the extending portion 81.

Next, the substrate 40 is electrically connected to the lead wire of the coil portion 213 and a connection wire (not shown) led out to the outside of the case 300. In the present embodiment, the substrate 40 is disposed below the coil portion 213.

In addition, as described above, the stator unit 20 has the filling portion 50. The filling portion 50 is filled between the cover member 30 and the stator 21 at least inside the cover member 30. The filler of the filling portion 50 is a resin material such as silicone resin, for example. The filling portion 50 covers the surface of the stator 21 with a filling material. For example, the filling portion 50 covers the outer surface of the stator core 211, the insulator 212, the coil portion 213, and the like.

In addition, as described above, the stator unit 20 has the bracket portion 60. The bracket portion 60 has a cover cylindrical shape, and has a cylindrical outer wall portion 63 extending in the axial direction, and the bracket portion 60 covers the lower end portion of the cylindrical portion 31. The bracket portion 60 further includes a lower cover portion 61 and a bearing holder holding portion 62.

The lower cover portion 61 is annular and radially expanded plate-shaped about the center axis CA. A bearing holder holding portion 62 is provided at an inner end portion of the lower cover portion 61. An outer wall portion 63 is provided at an outer end portion of the lower cover portion 61. Thus, as described above, the bracket portion 60 further includes the lower cover portion 61. The lower cover portion 61 covers the lower end portion of the outer wall portion 63.

The lower cover 61 is provided with a through hole 61a and a hole 61 b. The through hole 61a and the hole 61b will be described later.

The bearing holder holding portion 62 protrudes upward from an inner end portion of the lower cover portion 61, and extends in the circumferential direction. The bearing holder holding portion 62 holds the bearing holder 71. In the present embodiment, the bearing holder holding portion 62 has a cylindrical shape extending in the axial direction about the center axis CA. The inner surface of the bearing holder holding portion 62 contacts the bearing holder 71.

The outer wall portion 63 protrudes upward from an outer end portion of the lower cover portion 61, and extends in the circumferential direction. In the present embodiment, the outer wall portion 63 has a cylindrical shape centered on the center axis CA. A bracket recess 63a is provided at the upper end of the outer wall 63.

In the present embodiment, as shown in fig. 1, the bracket recess 63a is recessed downward from the upper surface of the outer wall portion 63 at the inner end portion of the outer wall portion 63. In other words, the bracket recess 63a is recessed outward from the inner surface of the outer wall 63 at the upper end of the outer wall 63. Also, the bracket recess 63a extends in the circumferential direction. Further, by forming the bracket recess 63a, a peripheral wall 63b is formed at the upper end of the outer wall 63. In the present embodiment, the peripheral wall portion 63b has a cylindrical shape extending in the axial direction, and the outer end portion of the outer wall portion 63 protrudes upward from the upper surface of the outer wall portion 63.

The wall portion 33 is fitted into the bracket recess 63a in the axial direction. The inner surface of the peripheral wall 63b is radially opposed to the outer surface of the wall 33. An elastic member 631 is provided between the peripheral wall 63b and the wall 33. In other words, the wall 33 is in contact with the side surface of the outer wall 63 through the elastic member 631 in the radial direction, and in the present embodiment, the elastic member 631 is in contact with the inner side surface of the outer wall 63.

Thus, even if the cover member 30 moves in the direction of separating from the bracket portion 60, the wall portion 33 is not easily separated from the outer wall portion 63 in the above-described separating direction by the deformation of the elastic member 631. The above-mentioned separating direction is, for example, an axial direction, and is upward in fig. 1. Further, the elastic member 631 makes it difficult to form a gap between the wall portion 33 and the outer wall portion 63. Therefore, it is possible to further suppress water and dust from entering the stator unit 20 from the outside thereof through the space between the wall portion 33 and the outer wall portion 63. Further, for example, leakage of the filling portion 50 before curing from the inside to the outside of the stator unit 20 through the space between the wall portion 33 and the outer wall portion 63 can be further suppressed.

The elastic member 631 is preferably made of any of an adhesive having elasticity and an elastic rubber. For example, the outer surface of the wall portion 33 and the inner surface of the bracket recess 63a are bonded together by the adhesive. Alternatively, the outer surface of the wall portion 33 and the inner surface of the bracket recess 63a are sealed with an elastic rubber. In this way, for example, the wall 33 can be bonded to the side surface of the outer wall 63 using a silicone adhesive. Alternatively, the space between the wall portion 33 and the outer wall portion 63 may be sealed using a rubber O-ring or the like.

Further, a groove 63c is provided on the inner surface of the outer wall 63 (see fig. 2 described later). The groove 63c is recessed outward from the inner surface of the outer wall 63, and extends downward from the inner upper surface of the bracket recess 63 a.

Next, the bearing holder 71 is formed in a cylindrical shape extending in the axial direction, and is provided inside the bearing holder holding portion 62. The outer surface of the bearing holder 71 is in contact with the inner surface of the bearing holder holding portion 62. During assembly, the bearing holder 71 is inserted into the cylindrical bearing holder holding portion 62 of the bracket portion 60 and fixed to the bearing holder holding portion 62. Further, the bearing holder 71 supports the stator 21. The inner end portion of the stator 21 is fixed to the bearing holder 71. Inside the bearing holder 71, bearings 710 are provided at an upper portion and a lower portion in the axial direction of the motor 1. Further, the shaft 11 is inserted into the bearing holder 71 and the bearing 710. The bearing holder 71 rotatably supports the shaft 11 via a bearing 710. In the present embodiment, the bearing 710 is a ball bearing, but is not limited to this example, and may be a sleeve bearing, for example.

The cap 72 is fitted into the lower end of the bearing holder 71 and covers the lower end.

< 1-2-3 > anti-coming-off part comprising extended part and convex part

Next, the retaining portion 80 including the extending portion 81 and the protruding portion 82 will be described. Fig. 2 is an enlarged view of the vicinity of the retaining portion 80 of the air blower 100 according to the embodiment.

< 1-2-3-1. elongation >

As described above, the stator unit 20 has the extension 81. The extending portion 81 extends in the axial direction from an end portion on one axial side of one of the cylindrical portion 31 and the outer wall portion 63. Here, the one side in the axial direction is a direction from one of the cylindrical portion 31 and the outer wall portion 63 to the other in the axial direction. In the present embodiment, the extension 81 extends downward from the lower end of the tube 31. More specifically, the extension 81 extends downward from the lower surface of the flange 312. The extending portion 81 is inserted through the groove portion 63c in the axial direction and is accommodated in the groove portion 63 c. In the present embodiment, the extension 81 is formed integrally with the tube 31. However, the extension 81 is not limited to this example, and may be a member separate from the tube 31.

The extension 81 has an opening 81a and a stopper 81 b. The opening 81a penetrates the extension 81 in the radial direction. The projection 82 is located inside the opening 81 a. That is, when the cover member 30 is attached to the bracket portion 60, the opening 81a receives the projection 82. The stopper 81b will be described later.

< 1-2-3-2. convex part >

In addition, as described above, the stator unit 20 has the convex portion 82. The convex portion 82 protrudes inward from the inner side surface of the other of the tube portion 31 and the outer wall portion 63. In the present embodiment, the convex portion 82 is provided on the outer wall portion 63 and protrudes inward from the inner surface of the outer wall portion 63. More specifically, the convex portion 82 is provided on the inner side surface inside the groove portion 63c, and protrudes inward from the side surface. In the present embodiment, the convex portion 82 has a structure integrated with the outer wall portion 63. However, the convex portion 82 is not limited to this example, and may be a member separate from the outer wall portion 63.

Thus, the stopper 81b and the projection 82 are provided at positions inward of the outer wall 63. Therefore, an increase in the radial dimension of the stator unit 20 can be suppressed. In the present embodiment, the stator unit 20 is used for the motor 1 mounted on the air blowing device 100. In this case, the air flow can be prevented from being obstructed along the outer side surface of the stator unit 20. In addition, the convex portion 82 may protrude outward from the outer surface of the outer wall portion 63, not limited to this example.

< 1-2-3-3. stopper part >

As described above, the extending portion 81 has the stopper 81b provided at the one axial side of the protruding portion 82. The axial direction side is a direction from one of the cylindrical portion 31 and the outer wall portion 63 to the other in the axial direction. In the present embodiment, the stopper 81b is provided below the opening 81a and below the projection 82. In the present embodiment, the stopper 81b and the projection 82 axially face each other. For example, the stopper 81b has a space between its upper surface and the lower surface of the projection 82. Alternatively, the stopper 81b may contact the projection 82 in the axial direction, not limited to this example. For example, the stopper 81b may axially contact a part of the lower surface of the projection 82, or may axially contact the entire lower surface of the projection 82.

In this way, even if a force acts on the cover member 30, the stopper 81b is restrained from moving in the axial direction toward the projection 82 by the projection 82. For example, when the material of the filling portion 50 is injected, when the cover member 30 is treated before the filling portion 50 is cured, or when the filling portion 50 expands during the curing of the filling portion 50, a force acts on the cover member 30. At this time, if the attachment strength between the cover member 30 and the bracket portion 60 is low, the cover member 30 may move upward relative to the bracket portion 60. In this case, as shown in fig. 2, the stopper 81b of the extension 81 extending downward from the lower end of the tube 31 can be prevented from moving upward by the protrusion 82 protruding inward from the inner surface of the outer wall 63. Therefore, in particular, the cover member 30 is not easily detached from the bracket portion 60.

More specifically, as shown in fig. 1, when an upward force acts on the cover member 30 when the stopper 81b and the projection 82 axially face each other, the cover member 30 may move further upward relative to the bracket portion 60. At this time, the stopper 81b moves upward and approaches the convex portion 82. In fig. 1, the upper side is a direction in which the cover member 30 is separated from the bracket portion 60. By such movement, the upward force acting on the cover member 30 is alleviated. When the upward force is sufficiently reduced until the upper surface of the stopper 81b contacts the lower surface of the projection 82, the cover member 30 stops moving upward relative to the bracket portion 60. Alternatively, even if the upward force is not sufficiently reduced, when the upper surface of the stopper 81b contacts the lower surface of the projection 82, the upward movement of the stopper 81b is stopped by the projection 82, and therefore the upward movement of the cover member 30 with respect to the bracket portion 60 is stopped. Therefore, by reducing the force acting on the cover member 30, the cover member 30 can be more reliably prevented from coming off the bracket portion 60. That is, the cover member 30 can be more reliably prevented from coming off the bracket portion 60.

As shown in fig. 1, a space is provided between the stopper 81b and the projection 82 in the axial direction. Therefore, the gap can mitigate and absorb the influence of the dimensional tolerance and the positional tolerance of the components included in the retaining portion 80. Therefore, the stopper portion 80 can be more reliably provided at the attachment portion of the cover member 30 and the bracket portion 60 without being affected by these tolerances. That is, regardless of the dimensional tolerance of the protruding portion 82, the extending portion 81 including the opening 81a and the stopper 81b, the positional tolerance of the extending portion 81 and the protruding portion 82, and the like, the protruding portion 82 can be inserted into the opening 81a of the extending portion 81 and axially opposed to the stopper 81b when the cover member 30 is attached to the bracket portion 60. This can prevent the cover member 30 from coming off the bracket portion 60 without being affected by the above-described tolerance.

Alternatively, unlike fig. 1, when the stopper 81b and the projection 82 are in contact in the axial direction, even if an upward force acts on the cover member 30, the upward movement of the stopper 81b is prevented by the projection 82, and therefore the cover member 30 can be prevented from moving upward relative to the bracket portion 60. Therefore, the cover member 30 can be directly prevented from coming off the bracket portion 60. Moreover, the cover member 30 can be prevented from floating from the bracket portion 60.

As described above, the stopper 81b and the projection 82 axially face each other. In the present embodiment, a part of the filling portion 50 is provided between the stopper portion 81b and the convex portion 82 in the axial direction. More specifically, a part of the filling portion 50 is provided at least in a part of the interval between the stopper portion 81b and the convex portion 82. Thus, the occurrence of a gap between the stopper 81b and the projection 82 can be suppressed. Therefore, even if a force acts on the cover member 30, the stopper 81b can be prevented from moving toward the projection 82 in the axial direction by the filling portion 50 sandwiched between the stopper 81b and the projection 82. Therefore, the cover member 30 can be further prevented from coming off the bracket portion 60 in the axial direction. This makes the cover member 30 less likely to fall off the bracket portion 60. Further, the present embodiment is not limited to the example, and a part of the filling portion 50 may not be provided in the gap between the stopper portion 81b and the convex portion 82. That is, the stopper 81b and the projection 82 may be all provided with a gap.

< 1-2-3-4. anticreep part

The retaining portion 80 is a snap-fit mechanism of the stopper portion 81b of the extending portion 81 and the protrusion 82. More specifically, when the cover member 30 is attached to the bracket portion 60, the extending portion 81 is warped in the radial direction by elastic deformation, and the stopper portion 81b is fitted into the opening 81a over the projection 82 and axially faces the projection 82. Thus, even if the cover member 30 moves upward, the stopper 81b abuts the projection 82 in the axial direction, and the cover member 30 is prevented from coming off the bracket portion 60 in the axial direction. The retaining portion 80 is preferably covered with the filling portion 50.

The retaining portion 80 is preferably provided in plurality in the circumferential direction. More specifically, the stopper 81b and the projection 82 are preferably provided in plural numbers. For example, in the present embodiment, the number of the retaining portions 80, the stopper portions 81b, and the protruding portions 82 is 6. In this way, the retaining portions 80 can be provided at a plurality of positions in the circumferential direction. Therefore, the cover member 30 can be more effectively prevented from coming off the bracket portion 60 in the axial direction. This further improves the effect of preventing the cover member 30 from coming off the bracket portion 60. However, the number of the retaining portions 80 is not limited to this example, and may be 1.

The retaining portions 80 are preferably arranged at equal intervals in the circumferential direction. More specifically, the stopper portions 81b and the convex portions 82 are preferably provided at equal intervals in the circumferential direction. In this way, the circumferential position of the cover member 30 with respect to the bracket portion 60 is not limited during assembly, as compared to the case where the stopper portions 81b and the convex portions 82 are not provided at equal intervals in the circumferential direction. Therefore, the cover member 30 can be easily attached to the bracket portion 60. This improves workability in assembly. Further, as described above, by disposing the stopper portions 81b and the convex portions 82 at equal intervals in the circumferential direction, the snap-fit mechanism of the cover member 30 and the bracket portion 60 can be provided at equal intervals without variation in the circumferential direction. That is, the effect of preventing the cover member 30 from coming off the bracket portion 60 can be obtained uniformly in the circumferential direction. However, the stopper 80 is not limited to this example, and may be disposed at an unequal interval in the circumferential direction. That is, the stoppers 81b and the protrusions 82 may not be provided at equal intervals in the circumferential direction.

< 1-2-4. through hole, hole part >

Next, the through hole 61a and the hole 61b will be described with reference to fig. 3 and 4. Fig. 3 is a perspective view showing the inside of the bracket portion 60 of the embodiment. Fig. 4 is a perspective view showing a lower surface of the bracket portion 60 of the embodiment. In fig. 3, the motor 1 is cut by an imaginary plane perpendicular to the axial direction including a broken line a-a of fig. 1. In fig. 3, the filling portion 50 is not shown.

As shown in fig. 3 and 4, the through hole 61a and the hole 61b penetrate the lower cover 61 in the axial direction.

In the present embodiment, the through-hole 61a is provided at a position overlapping the entire convex portion 82 as viewed in the axial direction. In this way, when the convex portion 82 of the bracket portion 60 is molded using a mold, the mold can be detached in the vertical direction. That is, it is not necessary to use radially offset parts as part of the mold. Therefore, the bracket portion 60 is more easily molded.

The hole 61b is provided in the lower lid 61 for injecting the material of the filling portion. The opening area of the hole 61b is preferably larger than the opening area of the through hole 61 a. In the present embodiment, the radial position and the circumferential position of the hole portion 61b are different from those of the through hole 61 a.

< 1-3 > variation 1

Next, a 1 st modification of the embodiment will be described. In modification 1, the protruding portion 82 of the retaining portion 80 is provided on the cylindrical portion 31 side, and the stopper portion 81b of the retaining portion 80 is provided on the bracket portion 60 side. The following describes a configuration of modification 1 that is different from the above-described embodiment. The same components as those in the above embodiment are denoted by the same reference numerals and description thereof may be omitted.

Fig. 5 is a sectional view showing a partial structural example of the vicinity of the stopper portion 80 of modification 1. Fig. 5 corresponds to a cross section of the motor 1 of a portion B surrounded by a broken line in fig. 1.

In modification 1, as shown in fig. 5, the bracket recess 63a is recessed downward from the upper surface of the outer wall portion 63 at the outer end portion of the outer wall portion 63. In other words, the bracket recess 63a is recessed inward from the outer surface of the outer wall 63 at the upper end of the outer wall 63, and extends in the circumferential direction. Further, by forming the bracket recess 63a, a peripheral wall 63b is formed at the upper end of the outer wall 63. In modification 1, the peripheral wall 63b has a cylindrical shape extending in the axial direction, and an inner end portion of the outer wall 63 protrudes upward from the upper surface of the outer wall 63.

The tube 31 further has a cover outer wall 313. In other words, the cover member 30 has a cover outer wall portion 313. In modification 1, the cover outer wall portion 313 is formed in a tubular shape extending in the axial direction, and extends downward from the lower end of the tubular portion 31 at the outer end of the tubular portion 31. In other words, the cover outer wall portion 313 extends downward from the lower end of the flange portion 312 at the outer end of the flange portion 312.

A wall portion 33 is provided at the lower end portion of the cover outer wall portion 313. The wall portion 33 extends downward from the lower end of the cylindrical portion 31. More specifically, the wall portion 33 protrudes downward from the lower surface of the cover outer wall portion 313 at the outer end portion of the cover outer wall portion 313, and extends in the circumferential direction. In modification 1, the wall portion 33 has a cylindrical shape extending in the axial direction.

The wall portion 33 is fitted into the bracket recess 63a in the axial direction. The inner surface of the peripheral wall 63b is radially opposed to the inner surface of the wall 33. An elastic member 631 is provided therebetween. In other words, the wall 33 is in contact with the outer surface of the outer wall 63 through the elastic member 631 in the radial direction. More specifically, the wall 33 is in contact with the outer surface of the peripheral wall 63b via the elastic member 631. Thus, even if the cover member 30 moves in the direction of separating from the bracket portion 60, the wall portion 33 is not easily separated from the outer wall portion 63 in the above-described separating direction by the deformation of the elastic member 631. In fig. 5, the above-mentioned separating direction is upward. Further, the elastic member 631 makes it difficult to form a gap between the wall portion 33 and the outer wall portion 63. Therefore, it is possible to further suppress water and dust from entering the stator unit 20 from the outside thereof through the space between the wall portion 33 and the outer wall portion 63. Further, for example, leakage of the filling portion 50 before curing from the inside to the outside of the stator unit 20 through the space between the wall portion 33 and the outer wall portion 63 can be further suppressed.

In addition, in modification 1, the extending portion 81 extends upward from the upper end portion of the outer wall portion 63. More specifically, the extending portion 81 extends from the upper end portion of the peripheral wall portion 63 b. In the present embodiment, the extension 81 is formed integrally with the outer wall 63. However, the extension 81 is not limited to this example, and may be a member separate from the outer wall 63.

In addition, in modification 1, the convex portion 82 protrudes inward from the inner side surface of the tube portion 31. More specifically, the convex portion 82 is provided on the inner side surface of the cover outer wall portion 313 and protrudes inward from the inner side surface. In the present embodiment, the convex portion 82 is formed integrally with the cover outer wall portion 313 of the tube portion 31. However, the convex portion 82 is not limited to this example, and may be a member separate from the cover outer wall portion 313 of the tube portion 31.

Thus, the stopper 81b and the convex portion 82 are provided at positions inside the cover outer wall portion 313. Therefore, an increase in the radial dimension of the stator unit 20 can be suppressed. In modification 1, the stator unit 20 is used in the motor 1 mounted on the air blowing device 100. In this case, the air flow can be prevented from being obstructed along the outer side surface of the stator unit 20. Further, the convex portion 82 may protrude outward from the outer surface of the cover outer wall portion 313, not limited to this example.

The stopper 81b of the extension 81 is provided above the projection 82. In the present embodiment, the stopper 81b is provided above the opening 81a provided in the extension 81 and is positioned above the projection 82. In the present embodiment, the stopper 81b and the projection 82 axially face each other. For example, a space is provided between the lower surface of the stopper 81b and the upper surface of the projection 82. Alternatively, the stopper 81b may contact the projection 82 in the axial direction, not limited to this example. For example, the stopper 81b may axially contact a part of the upper surface of the projection 82, or may axially contact the entire upper surface of the projection 82. Thus, even if a force acts on the cover member 30, the movement of the stopper 81b in the axial direction toward the projection 82 is suppressed by the projection 82. For example, as shown in fig. 5, the stopper 81b of the extending portion 81 extending upward from the upper end of the outer wall portion 63 is prevented from moving downward by the convex portion 82 protruding inward from the inner surface of the tube portion 31. Therefore, the cover member 30 can be prevented from being separated upward from the bracket portion 60. Therefore, the cover member 30 is not easily detached from the bracket portion 60.

More specifically, as shown in fig. 5, when an upward force acts on the cover member 30 when the stopper 81b and the projection 82 axially face each other, the cover member 30 may move further upward relative to the bracket portion 60. At this time, the convex portion 82 moves upward and approaches the stopper 81 b. In fig. 5, the upper side is a direction in which the cover member 30 is detached from the bracket portion 60. By such movement, the upward force acting on the cover member 30 is alleviated. When the upward force is sufficiently reduced until the upper surface of the projection 82 contacts the lower surface of the stopper 81b, the upward movement of the cover member 30 relative to the bracket portion 60 is stopped. Alternatively, even if the upward force is not sufficiently reduced, when the upper surface of the convex portion 82 contacts the lower surface of the stopper 81b, the upward movement of the convex portion 82 is stopped by the stopper 81b, and therefore the upward movement of the cover member 30 with respect to the bracket portion 60 is stopped. Therefore, the cover member 30 can be more reliably prevented from coming off the bracket portion 60 by reducing the force acting on the cover member 30. That is, the cover member 30 can be more reliably prevented from coming off the bracket portion 60.

As shown in fig. 5, a space is provided between the stopper 81b and the projection 82 in the axial direction. Therefore, the gap can mitigate and absorb the influence of the dimensional tolerance and the positional tolerance of the components included in the retaining portion 80. Therefore, the stopper portion 80 can be more reliably provided at the attachment portion of the cover member 30 and the bracket portion 60 without being affected by these tolerances. That is, regardless of the dimensional tolerance of the protruding portion 82, the extending portion 81 including the opening 81a and the stopper 81b, the positional tolerance of the extending portion 81 and the protruding portion 82, and the like, the protruding portion 82 can be inserted into the opening 81a of the extending portion 81 and axially opposed to the stopper 81b when the cover member 30 is attached to the bracket portion 60. This can prevent the cover member 30 from coming off the bracket portion 60 without being affected by the above-described tolerance.

Alternatively, unlike fig. 5, when the stopper 81b and the projection 82 are in contact in the axial direction, even if an upward force acts on the cover member 30, the projection 82 is prevented from moving upward by the stopper 81b, and therefore the cover member 30 is prevented from moving upward relative to the bracket portion 60. Therefore, the cover member 30 can be directly prevented from coming off the bracket portion 60. Moreover, the cover member 30 can be prevented from floating from the bracket portion 60.

In modification 1, a through hole 312a is provided instead of the through hole 61a (see fig. 2). The through hole 312a axially penetrates the flange 312. The through hole 312a is provided at a position overlapping the entire convex portion 82 when viewed in the axial direction. In this way, when the convex portion 82 of the cover member 30 is molded using the mold, the mold can be detached in the vertical direction. That is, it is not necessary to use radially offset parts as part of the mold. Therefore, the cover member 30 is more easily molded.

< 1-4 > variation 2

Next, a modification of embodiment 2 will be described. The following describes a configuration of modification 2 that is different from the above-described embodiment and modification 1. The same components as those in the above embodiment are denoted by the same reference numerals and description thereof may be omitted.

Fig. 6 is a perspective view showing the inside of the bracket portion 60 of the 2 nd modification. In fig. 6, the motor 1 is cut by an imaginary plane perpendicular to the axial direction including a broken line a-a of fig. 1. In fig. 6, the filling portion 50 is not shown.

In modification 2, a hole 61b that penetrates the lower cover 61 in the axial direction is provided in the lower cover 61 instead of the at least one through hole 61 a. The hole 61b overlaps the entire projection 82 when viewed in the axial direction. That is, the circumferential position and the radial position of the hole portion 61b include the circumferential position and the radial position of the convex portion 82.

In this way, the hole 61b for injecting the material of the filling portion 50 can be provided at the same circumferential position and radial position as the convex portion 82. Therefore, the hole 61b may not be provided separately from the through hole 61a, and the through hole 61a may be used to pull out the mold up and down when the bracket portion 60 having the convex portion 82 on the side surface is formed using the mold. Therefore, the shape of the mold used in the process of forming the bracket portion 60 can be simplified.

< 2. other >)

The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by applying various modifications to the above-described embodiments within a scope not departing from the gist of the present invention. In addition, the matters described in the above embodiments can be arbitrarily combined as appropriate within a range in which no contradiction occurs.

[ industrial applicability ]

The present invention is useful for a motor and an air blower including a stator unit having a cover member attached to a stator.

Claims (9)

1. A stator unit, characterized in that,

the stator unit has:

a stator that can drive a rotor that can rotate around a central axis line extending in a vertical direction;

a cover member having a cylindrical shape with a cover and a cylindrical portion extending in an axial direction, the cover member accommodating at least an upper portion of the stator;

a filling part filled between the cover member and the stator at least inside the cover member;

a bracket portion which is in a covered cylinder shape, has a cylindrical outer wall portion extending along the axial direction, and covers the lower end portion of the cylinder portion;

an extension portion that extends in an axial direction from an end portion on one axial side of one of the cylindrical portion and the outer wall portion, the one axial side being directed from the one axial side toward the other axial side; and

a convex portion protruding inward from an inner side surface of the other of the tube portion and the outer wall portion,

the extension portion has a stopper portion provided on one side in the axial direction of the projection portion,

the stopper portion is in contact with the convex portion in the axial direction, or the stopper portion is opposed to the convex portion in the axial direction.

2. The stator unit according to claim 1,

the stopper portion is axially opposed to the convex portion,

a part of the filling portion is disposed between the stopper portion and the convex portion in the axial direction.

3. The stator unit according to claim 1,

the lower end of the cylindrical portion is in axial contact with the upper end of the outer wall portion.

4. The stator unit according to claim 1,

the cover member further includes a wall portion extending downward from a lower end portion of the cylindrical portion,

the wall portion is in contact with a side surface of the outer wall portion via an elastic member in a radial direction.

5. The stator unit according to claim 4,

the elastic member is any of an adhesive having elasticity and an elastic rubber.

6. The stator unit according to claim 1,

the bracket portion further has a lower cover portion covering a lower end portion of the outer wall portion,

the convex portion is provided on the outer wall portion,

the lower cover portion is provided with a hole portion axially penetrating the lower cover portion,

the hole portion overlaps with the entire projection portion as viewed in the axial direction.

7. The stator unit according to claim 1,

the stopper and the projection are provided in plurality at equal intervals in the circumferential direction.

8. A motor is characterized in that a motor is provided,

the motor has:

a rotor that is rotatable about a central axis extending in a vertical direction; and

a stator unit according to any one of claims 1 to 7 having a stator capable of driving the rotor.

9. An air supply device is characterized in that,

the air supply device comprises:

the motor of claim 8; and

and a blade portion that is rotatable about a central axis line extending in a vertical direction together with the rotor of the motor.

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