Motor and blower device

Abstract

A rotor yoke 10 comprises: a flange part 14 which extends radially outward in an annular shape from a cylindrical part 12 and on which a blade part can be placed; and an engagement recess 30 where a portion of the flange part 14 is indented so as to protrude to the opposite side with respect to a cover part 50. The cover part 50 is attached to the flange part 14 of the rotor yoke 10. The cover part 50 comprises: an engagement protrusion 60 protruding to the flange part 14 side so as to engage with the indentation of the engagement recess 30; a nut holding space 64 where a nut can be held inside the engagement protrusion 60; and an insertion opening 66 for inserting the nut into the nut holding space 64 from the side of the engagement protrusion 60.

Description

Motor, blower

[0001] The present disclosure relates to a motor and a blower.

[0002] The blower rotates the blade portion by a motor. The blade portion is disposed below the motor and fixed to the motor by bolts and nuts (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2020-60150

[0004] When installing the blower on the ceiling, generally, after installing the motor on the ceiling, the blade portion is fixed to the motor. Specifically, while preventing the blade portion from falling by hand, it is necessary to screw the blade portion with a nut below the motor. As the blade portion becomes larger, the blade portion becomes heavier, so the assemblability is not good. Such a situation also occurs when the blade portion is fixed to the motor after removing the blade portion from the motor for maintenance of the blower.

[0005] Therefore, the present disclosure solves the above problems and aims to provide a technique for simplifying the fixing of the blade portion.

[0006] In order to solve the above problems, a motor according to an aspect of the present disclosure is a motor to which a blade portion is detachably fixed via a nut, and includes a cylindrical portion, and a flange portion that extends annularly radially outward from the cylindrical portion and on which the blade portion can be placed. A rotor yoke, a shaft that rotatably supports the rotor yoke, a stator connected to the shaft inside the cylindrical portion of the rotor yoke, and a cover portion attached to the flange portion of the rotor yoke and covering the stator together with the rotor yoke. The rotor yoke further includes an engagement concave portion that depresses a part of the flange portion so as to project to the side opposite to the cover portion. The cover portion includes an engagement convex portion that projects to the flange portion side so as to engage with the depression of the engagement concave portion, a nut holding space that can hold a nut inside the engagement convex portion, and an insertion opening for inserting the nut from the side of the engagement convex portion into the nut holding space.

[0007] According to the present disclosure, the fixing of the blade portion can be simplified.

[0008] Figure 1 is a perspective view showing the configuration of the blower according to this embodiment. Figure 2 is an exploded perspective view showing the configuration of the motor in Figure 1. Figure 3 is a partially enlarged view of the rotor yoke and cover in Figure 3. Figures 5(a)-5(c) are cross-sectional views showing the procedure for holding the nut by the engaging projection and engaging recess in Figure 3. Figure 3 is a cross-sectional view showing the configuration for holding the nut in the engaging projection and engaging recess. Figures 7(a)-5(d) are perspective views showing the configuration for holding the nut in the motor in Figure 2.

[0009] Before specifically describing the embodiments of this disclosure, an overview of the embodiments will be given. This embodiment relates to a blower installed on a ceiling. The blower includes a motor and a fan. When installing the blower on a ceiling, the motor is installed on the ceiling first, and then the fan is fixed to the motor. In such a blower, as the size and weight of the fan increase, it is required to make it easier to fix the fan to the motor.

[0010] In the blower according to this embodiment, the blades are fixed on the rotor yoke of the motor. With this configuration, the blades are fixed to the rotor yoke while being supported by the rotor yoke. As a result, even if the blades are heavy, they become easier to support by hand, and it becomes easier to fix the blades to the motor. Furthermore, when fixing the blades on the rotor yoke of the motor, a separate nut holder (resin part) is required to attach the blades, but in this embodiment, a space for holding the nut is provided in the rotor yoke and cover of the motor, so a nut holder is not required.

[0011] The embodiments described below all represent preferred specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement and connection configurations of components, as well as the steps (processes) and their order shown in the following embodiments are examples and are not intended to limit the present disclosure. Accordingly, components in the following embodiments that are not described in the independent claims representing the highest-level concepts of the present disclosure will be described as optional components. In addition, substantially identical components are denoted by the same reference numerals in each figure, and redundant explanations are omitted or simplified.

[0012] Figure 1 is a perspective view showing the configuration of the blower 200. The blower 200 includes a motor 100 and four blades 150. The number of blades 150 included in the blower 200 is not limited to "4". The four blades 150 are detachably fixed to the motor 100 via nuts (not shown). The fixing of the blades 150 to the motor 100 will be described later. A rod-shaped shaft 40 extending upward is located in the center of the motor 100. The shaft 40 is rotatable in the circumferential direction D2 about an axis extending in the axial direction D1. Since the shaft 40 is fixed directly or indirectly to the ceiling, when the motor 100 is operated, the motor 100 and the blades 150 rotate. The direction radiating outward from the axis (axial direction D1) of the shaft 40 is indicated as the radial direction D3.

[0013] Figure 2 is a perspective view showing the configuration of the motor 100. This corresponds to the configuration of the blower 200 in Figure 1 with the blades 150 removed. Figure 3 is an exploded perspective view showing the configuration of the motor 100. The motor 100 includes a rotor yoke 10, a shaft 40, a stator 42, and a cover 50. Here, the combined state of the rotor yoke 10 and the cover 50 as shown in Figure 2 can be referred to as the rotor.

[0014] The rotor yoke 10 includes a cylindrical portion 12 and a flange portion 14. The cylindrical portion 12 is positioned in the central part of a horizontal plane and has a hollow cylindrical shape. The upper surface of the cylindrical portion 12 is sealed, but has a circular opening, a through hole 20, in the central part. On the other hand, the lower surface of the cylindrical portion 12 (not shown) is completely open.

[0015] The flange portion 14 extends in an annular shape outward in the radial direction D3 from the cylindrical edge portion 22 of the cylindrical portion 12. The flange portion 14 is provided with a plurality of engagement recesses 30. One example of the number of engagement recesses 30 is "8". The shape of the engagement recesses 30 will be described later. One wing portion 150 (Figure 1) can be placed in two adjacent engagement recesses 30.

[0016] The cover portion 50 is formed in the shape of a disc with a diameter equal to the annular outer diameter of the flange portion 14. The cover portion 50 is attached to the flange portion 14 from the lower side. The shaft 40 and stator 42 are arranged in the central part of the cover portion 50. The stator 42 is the stationary part of the motor 100 and, together with the rotor, is the main component of the motor 100. The stator 42 is the stationary part of the motor 100 and has a magnet around which a coil is wound. The rotor is the rotating part of the motor 100 and is supported by the shaft 40 via bearings. Permanent magnets (not shown) are arranged inside the rotor (for example, on the inner wall of the cylindrical portion 12), and when current is passed through the motor 100, the magnetic field formed inside the stator 42 and the magnetic field formed in the rotor act on each other, causing the rotor to rotate.

[0017] With the cover portion 50 attached to the flange portion 14, the cover portion 50 covers the stator 42 together with the cylindrical portion 12 of the rotor yoke 10. The stator 42 is fixed to the shaft 40 inside the cylindrical portion 12 of the rotor yoke 10. The shaft 40 rotatably supports the rotor yoke 10. As described above, since the shaft 40 is fixed to the ceiling, when the motor 100 rotates, the rotor yoke 10 and the cover portion 50 rotate.

[0018] The cover portion 50 is provided with multiple engaging protrusions 60. One example of the number of engaging protrusions 60 is "8". Each engaging protrusion 60 is positioned on the cover portion 50 to correspond to one engaging recess 30, and engages with the engaging recess 30 when the cover portion 50 is attached to the flange portion 14. The shape of the cover portion 50 will be described later. A nut 120 can be inserted into the inside of the engaging protrusion 60. The nut 120 is used to fix the wing portion 150.

[0019] To further explain the engagement recess 30 and the shaft 40, Figure 4 is also used here. Figure 4 is a partially enlarged view of the rotor yoke 10 and the cover portion 50. The engagement recess 30 is formed by recessing a part of the flange portion 14 so as to protrude upward on the opposite side from the cover portion 50. The engagement recess 30 has a box shape and is fully open on one side in the circumferential direction D2 and on the bottom surface (not shown). The upper surface of the engagement recess 30 also has a circular opening, which is a through hole 32. The through hole 32 connects to the engagement recess internal space 34 located inside the engagement recess 30.

[0020] The engaging projection 60 is formed by causing a part of the cover portion 50 to protrude from the flange portion 14 side, i.e., the upper side, so as to engage with the recess of the engaging recess 30. The engaging projection 60 has a box shape and has a nut holding space 64 on the inside capable of holding a nut 120 (Figure 3). The engaging projection 60 also has an opening on one side in the circumferential direction D2 (hereinafter referred to as the "insertion opening 66") and an opening on the bottom surface (hereinafter referred to as the "cover portion opening 62"). The side with the insertion opening 66 is oriented in the same direction as the side of the engaging recess 30 that is completely open. The insertion opening 66 is an opening for inserting a nut into the nut holding space 64 from the circumferential direction D2, i.e., the side, of the disc shape of the engaging projection 60. Furthermore, the upper surface of the engaging projection 60 is partially open.

[0021] To further explain the retention of the nut 120 by the engaging projection 60 and the engaging recess 30, Figures 5(a)-(c) are also used here. Figures 5(a)-(c) are cross-sectional views showing the procedure for retaining the nut 120 by the engaging projection 60 and the engaging recess 30 of Figure 3. These are cross-sectional views along A-A' in Figure 3, that is, cross-sectional views in the circumferential direction D2. Figure 5(a) shows the configuration of the engaging projection 60. As described above, the engaging projection 60 is formed by recessing the cover portion 50 upwards. As a result, a cover portion opening 62 is located below the engaging projection 60, a nut holding space 64 is located inside the engaging projection 60, and an insertion opening 66 is located on one side of the engaging projection 60 in the circumferential direction D2.

[0022] Figure 5(b) shows the configuration when a nut 120 is inserted into the engaging projection 60 of Figure 5(a) through the insertion opening 66. The nut 120 is held in the nut holding space 64. The width of the cover opening 62, which is the lower opening of the nut holding space 64, is indicated as "A". The width of the nut 120 is indicated as "B". As shown in the figure, "A" is smaller than "B". Since "A" is smaller than "B", the nut 120 does not fall out of the cover opening 62. Here, in the cover 50, the difference between the width "A" of the cover opening 62 and the width "B" of the nut 120 is indicated as the fall suppression part 68. The fall suppression part 68 is a part that protrudes inward into the nut holding space 64 on the same plane as the disc shape of the cover 50, and is a part that suppresses the fall of the nut 120 from the cover opening 62.

[0023] Figure 5(c) shows the configuration when the engaging recess 30 is placed over the engaging projection 60 of Figure 5(b) from above. When the engaging recess 30 and the engaging projection 60 engage, the engaging recess 30 covers the engaging projection 60 and the nut 120. As described above, the entire side surface of the engaging recess 30 is open in the same direction as the side surface of the engaging projection 60 that has the insertion opening 66. The thickness of the flange portion 14 in that portion is indicated as the discharge suppression portion 38. The discharge suppression portion 38 covers a part of the insertion opening 66 when the engaging recess 30 and the engaging projection 60 are engaged. The discharge suppression portion 38 prevents the nut 120 from coming out of the insertion opening 66.

[0024] Furthermore, when the engaging projection 60 is engaged with the engaging recess 30, the tip of the projection abuts against the inside of the engaging recess 30. In other words, no gap is formed between the engaging projection 60 and the engaging recess 30. Because no gap is formed, the nut 120 is supported by both the rotor yoke 10 and the cover portion 50. As a result, the strength supporting the nut 120 is enhanced.

[0025] Figure 6 is a cross-sectional view showing the configuration in which the nut 120 is held by the engaging projection 60 and the engaging recess 30. This is a cross-sectional view taken along line B-B' in Figure 3, that is, a cross-sectional view in the radial direction D3. As before, the engaging recess 30 and the engaging projection 60 engage, and the nut 120 is held in the nut holding space 64. However, there is no opening on the side. As a result, the nut 120 cannot be removed in the direction of the side or the radial direction D3.

[0026] As described above, the blade portion 150 is placed on the upper surface of the engaging recess 30. A screw (not shown) attached to the blade portion 150 passes through the through hole 32, the opening on the upper surface of the engaging projection 60, the through hole in the nut 120, and the opening 62 of the cover portion. In this state, the blade portion 150 is fixed to the motor 100 by screwing the screw and the nut 120 together. At this time, the weight of the blade portion 150 (Figure 1) applies a force to the nut 120 outward in the radial direction D3 and in the axial direction D1. Since the engaging recess 30 and the engaging projection 60 do not open in the radial direction D3, the nut 120 does not come out of the engaging recess 30 and the engaging projection 60 even when the weight of the blade portion 150 (Figure 1) is applied.

[0027] Figures 7(a)-7(d) are perspective views showing the configuration for holding the nut 120 in the motor 100. Figure 7(a) is a perspective view of the motor 100 seen from above, and is shown in the same way as in Figure 2. Figure 7(b) is an enlarged perspective view of the engagement recess 30 in Figure 7(a). The engagement projection 60 is positioned within the engagement recess space 34 of the engagement recess 30, and the nut 120 is held within the nut holding space 64 of the engagement projection 60. The nut 120 is exposed to the outside of the engagement projection 60 through the insertion opening 66, but the discharge suppression part 38 prevents the nut 120 from coming out.

[0028] Figure 7(c) is a perspective view of the motor 100 from below, and Figure 7(d) is an enlarged perspective view of the engaging projection 60 in Figure 7(c). The nut 120, which is held in the nut holding space 64, is exposed from the cover opening 62. The fall prevention part 68 prevents the nut 120 from falling.

[0029] In this embodiment, the engaging projection 60 is positioned in the space 34 within the engaging recess 30 on which the blade portion 150 is placed, and the nut 120 is held in the nut holding space 64 of the engaging projection 60, so that the blade portion 150 can be fixed on top of the motor 100. Also, since the blade portion 150 is fixed on top of the motor 100, fixing the blade portion 150 can be simplified. Since the nut 120 is held by the engaging recess 30 of the rotor yoke 10 and the engaging projection 60 of the cover portion 50, a separate nut holder can be eliminated.

[0030] Furthermore, since the nut 120 is inserted into the nut holding space 64 from the circumferential direction D2 of the cover portion 50, even if the weight of the wing portion 150 is applied to the engaging projection 60, the nut 120 is less likely to come off the engaging projection 60. Also, since the fall suppression portion 68 protrudes inward into the nut holding space 64, the nut 120 can be prevented from falling. In addition, since the discharge suppression portion 38 covers a part of the insertion opening 66 when the engaging recess 30 and the engaging projection 60 are engaged, the nut 120 can be prevented from coming out of the insertion opening 66. Furthermore, since the tip of the projection abuts against the inside of the engaging recess 30 when the engaging projection 60 and the engaging recess 30 are engaged, the strength supporting the nut 120 can be strengthened.

[0031] An overview of one aspect of this disclosure is as follows: (Item 1) A motor (100) on which a blade portion (150) is detachably fixed via a nut (120), comprising: a rotor yoke (10) having a cylindrical portion (12) and a flange portion (14) extending annularly outward radially (D3) from the cylindrical portion (12) on which the blade portion (150) can be mounted; a shaft (40) that rotatably supports the rotor yoke (10); a stator (42) connected to the shaft (40) inside the cylindrical portion (12) of the rotor yoke (10); and a cover portion (50) attached to the flange portion (14) of the rotor yoke (10) and covering the stator (42) together with the rotor yoke (10), wherein the rotor yoke (10) further comprises: an engagement recess (30) formed by recessing a part of the flange portion (14) so ​​as to protrude on the opposite side from the cover portion (50), and the cover portion (50) A motor (100) comprising: an engaging projection (60) projecting toward the flange portion (14) so ​​as to engage with the recess (30); a nut holding space (64) capable of holding the nut (120) inside the engaging projection (60); and an insertion opening (66) for inserting the nut (120) into the nut holding space (64) from the side of the engaging projection (60).

[0032] (Item 2) The motor (100) according to Item 1, wherein the cover portion (50) is formed in a disc shape having a diameter equal to the annular outer diameter of the flange portion (14), and the insertion opening (66) allows the nut (120) to be inserted into the nut holding space (64) from the circumferential direction of the disc shape.

[0033] (Item 3) The motor (100) according to Item 2, wherein the cover portion (50) is provided with a fall suppression portion (68) that protrudes inward into the nut holding space (64) on the same plane as the disc shape.

[0034] (Item 4) The motor (100) according to Item 1, wherein the flange portion (14) is provided with a discharge suppression portion (38) that covers a part of the insertion opening (66) when the engaging recess (30) and the engaging projection (60) are engaged.

[0035] (Item 5) The motor (100) according to Item 1, wherein the engaging projection (60) is engaged with the engaging recess (30) and the tip of the projection abuts against the inside of the engaging recess (30).

[0036] (Item 6) A blower (200) comprising the blade section (150) and the motor (100) described in Item 1.

[0037] Although the present disclosure has been explained above based on the examples, it can be easily inferred that the present disclosure is not limited in any way to the above examples, and that various improvements and modifications are possible without departing from the spirit of the present disclosure.

[0038] According to this disclosure, the fixing of the blade portion can be simplified.

[0039] D1 Axial direction, D2 Circumferential direction, D3 Radial direction, 10 Rotor yoke, 12 Cylindrical section, 14 Flange section, 20 Through hole, 22 Cylindrical edge, 30 Engaging recess, 32 Through hole, 34 Space inside the engaging recess, 38 Discharge suppression section, 40 Shaft, 42 Stator, 50 Cover section, 60 Engaging protrusion, 62 Cover section opening, 64 Nut holding space, 66 Insertion opening, 68 Drop suppression section, 100 Motor, 120 Nut, 150 Blade section, 200 Blower.

Claims

1. A motor in which a blade portion is detachably fixed via a nut, comprising: a rotor yoke having a cylindrical portion and a flange portion extending radially outward in an annular shape from the cylindrical portion and on which the blade portion can be mounted; a shaft that rotatably supports the rotor yoke; a stator connected to the shaft inside the cylindrical portion of the rotor yoke; and a cover portion attached to the flange portion of the rotor yoke and covering the stator together with the rotor yoke, wherein the rotor yoke further comprises an engagement recess formed by recessing a part of the flange portion so as to protrude on the opposite side from the cover portion; and the cover portion comprises an engagement projection protruding toward the flange portion so as to engage with the recess of the engagement recess, a nut holding space inside the engagement projection capable of holding the nut, and an insertion opening for inserting the nut into the nut holding space from the side of the engagement projection.

2. The motor according to claim 1, wherein the cover portion is formed in a disc shape having a diameter equal to the annular outer diameter of the flange portion, and the insertion opening allows the nut to be inserted into the nut holding space from the circumferential direction of the disc shape.

3. The motor according to claim 2, wherein the cover portion comprises a fall-prevention portion that protrudes inward into the nut-holding space on the same plane as the disc-shaped portion.

4. The motor according to any one of claims 1 to 3, wherein the flange portion includes a discharge suppression portion that covers a part of the insertion opening when the engaging recess and the engaging projection are engaged.

5. The motor according to any one of claims 1 to 4, wherein the tip of the engaging projection abuts against the inside of the engaging recess when the engaging projection is engaged with the engaging recess.

6. A blower comprising the blade portion and the motor according to any one of claims 1 to 5.

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