Air blower

Abstract

To provide an air blower capable of effectively cooling a portion where heat is generated when a motor is driven.SOLUTION: An air blower is configured such that a suction port consists of a first suction port provided radially between a motor and a centrifugal fan, and a second suction port provided on an axial wall of the motor; the motor comprises a motor exhaust hole that radially penetrates a motor outer peripheral wall extending axially; and gas suctioned into the motor from the second suction port, passing through the motor, and exhausted from the motor exhaust hole, is merged with gas suctioned from the first suction port and is exhausted in a direction perpendicular to a central axis.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a blower, and more particularly to a blower comprising a motor that rotates around a central axis, and a centrifugal fan that is driven by the motor to rotate in the circumferential direction and that comprises a plurality of blades arranged at predetermined intervals circumferentially outside the motor in the radial direction of the central axis, and that draws in air through intake ports provided on one or both sides of the central axis in the axial direction as the centrifugal fan rotates, and exhausts air in a direction perpendicular to the central axis. [Background technology]

[0002] Various proposals have been made in the past regarding the above-described blower device.

[0003] For example, Patent Document 1 discloses a centrifugal fan including a fan having a motor unit rotating around a central axis and a plurality of blades arranged on the outer periphery of the motor unit, and a casing that houses the fan and has an air intake port axially aligned with the central axis and an air outlet perpendicular to the central axis. The proposed structure includes a plurality of blade groups, each having a notched portion on the end face facing the air intake port that is inclined toward the motor unit, where the notched portions start to slope at different positions in the direction from the tip of the blade toward the motor unit. This structure is said to be able to suppress noise generation.

[0004] Patent Document 2 discloses a blower including a centrifugal fan and an axial gap motor that drives the centrifugal fan. The motor includes a disk-shaped rotor, bearings that rotatably support the rotor or a shaft fixed to the rotor, and a stator having a stator core that faces the rotor in the axial direction of the rotor via an air gap. A first through-hole that penetrates the rotor in the axial direction is provided radially inward of the stator core. The blower also includes a circulation path that draws a portion of the air blown by the centrifugal fan from the radial outside of the air gap of the motor through the air gap and the first through-hole into the centrifugal fan. The blower is said to be able to efficiently cool the stator of an axial gap motor.

[0005] The blower device of the above-described form is used, for example, in an air conditioner, or inside a notebook PC, a desktop PC, a tablet PC, a smartphone, a game console, etc., to blow air for air conditioning or for dissipating heat and cooling the inside of the device. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-55133 [Patent Document 2] Japanese Patent Application Publication No. 2023-140000 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide an air blower that includes a motor that rotates around a central axis, and a centrifugal fan that is driven by the motor to rotate in the circumferential direction and consists of a plurality of blades arranged at predetermined intervals circumferentially outside the motor in the radial direction of the central axis, and that draws in air through intake ports provided on one or both sides of the central axis in the axial direction as the centrifugal fan rotates, and exhausts air in a direction perpendicular to the central axis, without causing large fluctuations in the exhaust temperature from the centrifugal fan, and that can effectively cool parts that are located within the motor and generate heat when the motor is running. [Means for solving the problem]

[0008] The present invention can be exemplified as follows. [1] a motor that rotates around a central axis; a centrifugal fan that is driven by the motor and rotates in the circumferential direction, the centrifugal fan including a plurality of blades arranged at predetermined intervals in the circumferential direction outside the motor in the radial direction of the central axis, A blower that, by rotation of the centrifugal fan, draws in air from an intake port provided on one or both sides of the central axis in the axial direction and exhausts it in a direction perpendicular to the central axis, the air intake includes a first air intake provided between the motor and the centrifugal fan in the radial direction, and a second air intake provided on a wall surface of the motor in the axial direction, The motor includes a motor exhaust hole extending radially through an axially extending outer peripheral wall of the motor, The gas drawn into the motor from the second intake port, passing through the motor, and exhausted from the motor exhaust port joins the gas drawn in from the first intake port and is exhausted in a direction perpendicular to the central axis. Blower.

[0009] [2] The air drawn into the motor through the second intake port comes into contact with a coil disposed within the motor and is then discharged through the motor exhaust port.

[0010] [3] The gas comes into contact with the coil through a coil cooling passage, which is a passage formed by a space within the motor and continues from the second air intake to the motor exhaust port. [2] A blower device.

[0011] [4] the motor outer peripheral wall is made of a rotor of the motor that rotates in a circumferential direction around the central axis, The centrifugal fan is supported by a fan support part that extends radially outward from the rotor and rotates together with the rotor.

[0012] [5] the motor includes a magnet on an inner wall surface of the rotor, The blower device according to [4], wherein the magnet has a magnet exhaust hole that communicates with the motor exhaust hole.

[0013] [6] The motor comprises a coil fixedly arranged concentrically with respect to the central axis, and an inner yoke and an outer yoke that sandwich the coil radially therebetween, and the outer yoke constitutes the rotor. [4] A blower device.

[0014] [7] The magnet is arranged on the inner wall surface of the outer yoke. The blower device according to [6], wherein the magnet has a magnet exhaust hole that communicates with the motor exhaust hole.

[0015] [8] A magnet is provided on the outer wall surface of the inner yoke, The blower device according to [6], wherein the magnet has a magnet through-hole that passes through the magnet in the radial direction. [Effects of the Invention]

[0016] According to this invention, there is provided a blower comprising a motor that rotates around a central axis, and a centrifugal fan that is driven by the motor to rotate in the circumferential direction and that comprises a plurality of blades arranged at predetermined intervals circumferentially outside the motor in the radial direction of the central axis, and that draws in air through intake ports provided on one or both sides of the central axis in the axial direction as the centrifugal fan rotates, and exhausts air in a direction perpendicular to the central axis, and it is possible to provide a blower that can effectively cool parts that are located within the motor and generate heat when the motor is running, without causing large fluctuations in the exhaust temperature from the centrifugal fan. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view, with a portion omitted, illustrating an example of an internal structure of a blower according to an embodiment of the present invention. [Figure 2] 1. FIG. 4 is a partially omitted cross-sectional view illustrating another example of the structure of the blower device according to the embodiment shown in FIG. [Figure 3] 1. FIG. 4 is a partially omitted perspective view illustrating another example of the structure of the blower shown in FIG. [Figure 4] 1 is a diagram illustrating an example of an arrangement of a plurality of blades arranged at predetermined intervals in the circumferential direction around the central axis of a centrifugal fan constituting an air blower according to an embodiment of the present invention; [Figure 5] 1. FIG. 4 is a partially omitted cross-sectional view illustrating another example of the structure of the blower shown in FIG. [Figure 6] FIG. 10 is a partially omitted cross-sectional view illustrating an example of an internal structure of a blower according to another embodiment of the present invention. [Figure 7] 7 is a cross-sectional view, with some parts omitted, illustrating another example of the structure of the blower shown in FIG. 6. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, dimensions such as length, width, and thickness have been appropriately changed from the actual scale for the sake of clarity and simplification of the drawings, and do not represent actual relative dimensions.

[0019] (First embodiment) The blowers 1, 21, and 31 shown in FIGS. 1, 2, and 5 include a motor 3 and a centrifugal fan 4.

[0020] The motor 3 rotates around the central axis 2 in the direction of the arrow 60, for example.

[0021] The centrifugal fan 4 is composed of a plurality of blades 40a, 40b, 40c, 30d, ... (Figure 4) arranged at predetermined intervals in the circumferential direction outside the motor 3 in the radial direction of the central axis 2, and is driven by the motor 3 to rotate in the circumferential direction indicated by the arrow 60 in Figure 4.

[0022] FIG. 4 shows an example of the arrangement of the plurality of blades 40a, 40b, 40c, 30d, . . . that are arranged at predetermined intervals in the circumferential direction around the central axis 2 of the centrifugal fan 4.

[0023] In the blower devices 1, 21, and 31, the centrifugal fan 4 rotates around the central axis 2, for example, in the direction of arrow 60, to draw in air through intake ports provided on one or both sides of the axial direction of the central axis 2, and exhaust air in a direction perpendicular to the central axis 2.

[0024] FIG. 4 shows an example of an arrangement of a plurality of blades 40a, 40b, 40c, 30d, ... arranged at predetermined intervals in the circumferential direction around the central axis 2 of the centrifugal fan 4. However, any arrangement of blades that has been conventionally used for centrifugal fans that are driven by a motor 3 arranged radially inside to rotate in the circumferential direction of the central axis 2, draw in air through intake ports provided on one or both axial sides of the central axis 2, and exhaust air in a direction perpendicular to the central axis 2 can be used.

[0025] 1, 2, and 5, the air intakes are formed only in the radial direction between the motor 3 and the centrifugal fan 4, in the direction from top to bottom in FIGS. 1 and 2, along the axial direction of the central shaft 2. In the embodiment shown in FIG. 5, the air intakes are formed in the radial direction between the motor 3 and the centrifugal fan 4, in the axial direction of the central shaft 2, in both the direction from top to bottom and the direction from bottom to top in FIG.

[0026] In the embodiment shown in Figures 1 to 5, the motor 3 is a brushless, coreless type motor, as shown and described below.

[0027] The central shaft 2 is rotatably supported by a stator 13 via bearings 14, and the stator 13 supports a cylindrical coil 8 arranged concentrically about the central shaft 2. The central shaft 2 supports a cylindrical inner yoke 9 and a cylindrical outer yoke 10, which sandwich the cylindrical coil 8 between them in the radial direction. A magnet is disposed on the outer peripheral surface of the inner yoke 9 or the inner peripheral surface of the outer yoke 10, and a magnetic field with a circular cross section is formed with the cylindrical coil 8 sandwiched between them. In the embodiments shown in FIGS. 1, 2, and 5, the magnet 7 is disposed on the outer peripheral surface of the cylindrical inner yoke 9, but an embodiment in which a magnet is disposed on the inner peripheral surface of the cylindrical outer yoke 10 is also possible.

[0028] When a magnetic field with a circular cross section is formed as described above between the inner yoke 9 and the outer yoke 10, which sandwich the cylindrical coil 8 radially, and current is applied to the cylindrical coil 8, the central shaft 2, the inner yoke 9, and the outer yoke 10 rotate in the circumferential direction of the central shaft 2, as indicated by arrow 60 in Fig. 1, for example. Thus, in this embodiment, the inner yoke 9 and the outer yoke 10 supported by the central shaft 2 form a rotor that rotates in the circumferential direction around the central shaft 2 of the motor 3.

[0029] The structure and configuration of this type of brushless, coreless motor 3 are well known. Therefore, in Figures 1, 2, and 5, as described below, only the structural components characteristic of this embodiment are shown in a simplified form, except for the gas drawn into motor 3 through second intake ports 6, 6g-6j, flowing through coil cooling passages formed by spaces within motor 3 while coming into contact with the surface of coil 8, and being discharged through motor exhaust holes 10a-10d, 10e-10g. For example, circuit boards and the like are provided inside motor 3, as indicated by reference numerals 15 and 16, and connection wires to coil 8 and lead wires to the outside are connected to these, but these are not shown.

[0030] In the embodiment shown in Figures 1 to 5, the centrifugal fan 4 is supported by fan support parts 20 (Figures 1 to 3), 20a, 20b, 20c, 20d (Figure 5) that extend radially outward from the rotor of the motor 3 formed as described above, and is configured to rotate together with the rotor of the motor 3 formed as described above.

[0031] In the embodiment shown in Figures 1, 2 and 3, the centrifugal fan 4 is supported at the tip of a fan support part 20 (Figures 1 to 3) that extends radially outward from the axial lower end of the outer yoke 10 that constitutes the rotor (the lower end of the outer yoke 10 in Figures 1, 2 and 3).

[0032] In the embodiment shown in FIG. 5, in which air intakes are formed between the motor 3 and the centrifugal fan 4 in the radial direction, both in the direction from top to bottom (air intakes 5a, 5c) and in the direction from bottom to top (air intakes 5b, 5d) in the axial direction of the central axis 2, the centrifugal fan 4 is supported at the tips of fan support portions 20a, 20b, 20c, 20d that extend radially outward from the axial center of the outer yoke 10 that constitutes the rotor.

[0033] In the blower devices 1 (FIG. 1), 21 (FIG. 2), and 31 (FIG. 5) of the present embodiment, the motor 3 is provided with a motor exhaust hole that penetrates the outer peripheral wall of the motor extending in the axial direction in the radial direction.

[0034] In the embodiment of FIGS. 1 and 2, motor exhaust holes 10a, 10b, 10c, and 10d penetrate the outer peripheral wall of the motor 3 in the radial direction, the outer peripheral wall extending in the axial direction of the motor 3.

[0035] In the blower device 1a of FIG. 3, motor exhaust holes 10e, 10f, and 10g are formed at predetermined intervals in the circumferential direction, penetrating the outer peripheral wall of the motor 3 extending in the axial direction of the motor 3 in the radial direction.

[0036] 1 and 2, the motor exhaust holes 10a, 10b are formed at intervals in the axial direction of the motor 3. The motor exhaust holes 10a, 10b in FIGS. 1 and 2 can also be formed at intervals in the axial direction and at a predetermined interval in the circumferential direction, as shown in FIG.

[0037] As described above, in the embodiment of motor 3 shown in Figures 1 to 5, which is a brushless, coreless type motor, the cylindrical outer yoke 10 forms the radial outer wall portion of motor 3. Therefore, in the illustrated embodiment, motor exhaust holes 10a, 10b, 10c, and 10d that radially penetrate the motor outer wall extending in the axial direction are all formed in the cylindrical outer yoke 10 as shown in Figures 1, 2, 3, and 5.

[0038] In the blower devices 1 (FIG. 1), 21 (FIG. 2), 1a (FIG. 3), and 31 (FIG. 5) of this embodiment, the above-mentioned air intakes formed between the motor 3 and the centrifugal fan 4 in the radial direction, in a direction from top to bottom in the axial direction of the central axis 2, or in the reverse direction, or in both directions, consist of first air intakes 5, 5a, 5b, 5c, and 5d provided between the motor 3 and the centrifugal fan 4 in the radial direction, and second air intakes 6 (FIG. 1), 6a-6f (FIG. 3), and 6g-6j (FIG. 2) provided on the axial wall surface of the motor 3.

[0039] That is, second air intakes 6 (Fig. 1), 6a-6f (Fig. 3), 6g-6j (Fig. 2) that take in air in the same direction as the first air intakes 5, 5a, 5c are provided on the wall surface of the motor 3 extending in the axial direction.

[0040] In addition, when the first air intakes 5a, 5b, 5c, and 5d provided between the motor 3 and the centrifugal fan 4 in the radial direction are formed in both directions, from top to bottom along the axial direction of the central axis 2 and the reverse direction, the second air intakes formed in the axial wall surface of the motor 3 and taking in air in the same direction as the first air intakes can be configured to take in air in at least one of the directions as the first air intakes taking in air, as shown in Fig. 5. In the embodiment shown in Fig. 5, the second air intake 6 taking in air in the same direction as the first air intakes 5a and 5c is formed in the wall surface extending in the axial direction of the motor 3.

[0041] In all of the blower devices 1 (Figure 1), 21 (Figure 2), 1a (Figure 3), and 31 (Figure 5), the area of ​​the first air intakes 5, 5a to 5d provided between the motor 3 and the centrifugal fan 4 in the radial direction, as viewed in the axial direction, is larger than the sum of the areas of the second air intakes 6 (Figure 1), 6a to 6f (Figure 3), and 6g to 6j (Figure 2) provided on the axial wall surface of the motor 3, as viewed in the axial direction.

[0042] In the blower device 1 (Figure 1) and 31 (Figure 5) of this embodiment, the gas sucked into the motor 3 from the second air intake 6, passes through the motor 3, and is exhausted from the motor exhaust holes 10a to 10d, and then joins with the gas sucked in from the first air intake 5 and is exhausted in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c.

[0043] In the blower 21 (Fig. 2), the gas sucked into the motor 3 through the second intake ports 6g to 6j, passing through the motor 3, and exhausted from the motor exhaust holes 10a to 10d joins with the gas sucked in from the first intake port 5 (Fig. 2) and is exhausted in a direction perpendicular to the central axis 2, as shown by the arrows 54a to 54c.

[0044] In the blower 31 (Figure 5), the gas sucked into the motor 3 through the second intake port 6, passes through the motor 3, and is exhausted from the motor exhaust holes 10a to 10d, where it joins with the gas sucked in from the first intake ports 5a, 5c, 5b, and 5d, and is exhausted in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c.

[0045] That is, in any embodiment, the gas sucked into the motor 3 through the second intake ports 6, 6g to 6j comes into contact with the coil 8 arranged in the motor 3, and then is discharged through the motor exhaust holes 10a to 10d, where it joins with the gas sucked in through the first intake ports 5, 5a to 5d and is discharged in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c.

[0046] The gas sucked into the motor 3 through the second intake ports 6, 6g to 6j and before being exhausted from the motor 3 through the motor exhaust holes 10a to 10d increases in flow velocity in the narrow space within the motor 3 and flows while coming into contact with the surface of the coil 8 as shown in Figures 1, 22, and 5.

[0047] As a result, the coil 8, which generates heat in response to the energization to drive the motor 3, is cooled by the gas flowing over the surface.

[0048] Therefore, the space inside the motor 3, which is continuous from the second intake ports 6, 6g to 6j to the motor exhaust holes 10a to 10d, can be said to be a passage formed inside the motor 3 for cooling the coil.

[0049] The blowers 1, 21, and 31 of this embodiment draw air in through intake ports provided on one or both sides of the central axis 2 in the axial direction by the rotation of the centrifugal fan 4, and exhaust it in a direction perpendicular to the central axis 2.The main purpose of these blowers is to blow air for air conditioning and for heat dissipation and air cooling inside equipment.

[0050] As described above, in the blower devices 1, 21, 1a, and 31 of this embodiment, the area of ​​the first air intakes 5, 5a to 5d provided between the motor 3 and the centrifugal fan 4 in the radial direction, as viewed in the axial direction, is larger than the sum of the areas of the second air intakes 6 (Figure 1), 6a to 6f (Figure 3), and 6g to 6j (Figure 2) provided on the axial wall surface of the motor 3, as viewed in the axial direction.

[0051] As a result, the volume of air drawn from first air intake ports 5, 5a to 5d in the direction in which central axis 2 extends is greater than the volume of air drawn into motor 3 in the direction in which central axis 2 extends for cooling coil 8. A large flow of gas drawn from first air intake ports 5, 5a to 5d in the direction in which central axis 2 extends and exhausted in a direction perpendicular to central axis 2 joins with a flow of gas drawn into motor 3 in the direction in which central axis 2 extends, passes through the coil cooling passage, and is exhausted from motor exhaust holes 10a to 10d in a direction perpendicular to central axis 2, resulting in an overall exhaust of air in a direction perpendicular to central axis 2.

[0052] This structure allows the coil 8, which generates heat to drive the motor 3, to be cooled within the motor 3, without interfering with the air conditioning and the air for heat dissipation and cooling inside the equipment.

[0053] In the embodiment shown in Figures 1, 2 and 5, magnets 7 are arranged on the outer peripheral wall surface of the inner yoke 9 that forms the rotor, and therefore exhaust holes 9a, 9b, 9c, and 9d are also formed in the inner yoke 9 in an arrangement similar to that in which motor exhaust holes 10a, 10b, 10c, 10d, and 10e to 10g (Figure 3) are formed in the outer yoke 10.

[0054] Magnet 7, which is disposed on the outer peripheral wall surface of inner yoke 9, also has exhaust holes 7a, 7b, 7c, and 7d formed in the locations corresponding to exhaust holes 9a, 9b, 9c, and 9d.

[0055] However, since it is sufficient that the gas drawn into the motor 3 through the second intake ports 6, 6g to 6j flows through the space within the motor 3 that forms the coil cooling passage so that it comes into contact with the surface of the cylindrical coil 8, the inner yoke 9 and magnet 7 may be configured without exhaust holes 9a, 9b, 9c, 9d and exhaust holes 7a, 7b, 7c, 7d.

[0056] Although not shown, if a magnet that forms a magnetic field with a circular cross section between the inner yoke 9 and the outer yoke 10, which sandwich the cylindrical coil 8 radially between them, is arranged on the inner peripheral wall surface of the outer yoke 10, exhaust holes that are continuous with the above-mentioned motor exhaust holes 10a, 10b, 10c, 10d, 10e to 10g (FIG. 3) formed in the outer yoke 10 must be formed in the magnet arranged on the inner peripheral wall surface of the outer yoke 10 at positions corresponding to the positions of the motor exhaust holes 10a, 10b, 10c, 10d, 10e to 10g (FIG. 3).

[0057] In the blower devices 1, 21, and 31 of this embodiment, the gas sucked into the motor 3 from the second air intakes 6, 6g to 6j comes into contact with the coil 8 arranged in the motor 3, and then is discharged from the motor exhaust holes 10a to 10d, where it joins with the gas sucked in from the first air intakes 5, 5a to 5d and is discharged in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c.

[0058] The exhaust volume and exhaust flow rate of the air discharged from the blowers 1, 21, 31 in a direction perpendicular to the central axis 2 as shown by arrows 54a to 54c are hardly reduced compared to when no flow passes through the motor 3, even though a flow occurs within the motor 3 via the second air intakes 6, 6g to 6j and the motor exhaust holes 10a to 10d, and there is no significant impact on the air discharged by the blowers 1, 21, 31 for air conditioning or for heat dissipation and air cooling within the equipment.

[0059] As described above, as the gas flows through the motor 3, it comes into contact with the coil 8 that generates heat inside the motor 3 and removes heat from the coil 8. However, the gas drawn into the motor 3 from the second air intakes 6, 6g to 6j comes into contact with the coil 8 disposed inside the motor 3, and then is discharged from the motor exhaust holes 10a to 10d, where it joins with the gas drawn in from the first air intakes 5, 5a to 5d and is discharged in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c. Therefore, compared to when there is no flow through the motor 3, there is no significant impact on the airflow for air conditioning by the air blowers 1, 21, 31 or the airflow for heat dissipation and air cooling inside the equipment.

[0060] In order for the gas drawn into the motor 3 through the second air intakes 6, 6g to 6j to flow through the coil cooling passage formed by the space within the motor 3 so as to come into contact with the surface of the cylindrical coil 8, it is desirable that the motor exhaust holes 10a, 10b, 10c, 10d, 10e to 10g (Figure 3) are located radially outward from the cylindrical coil 8, as shown, and the second air intake 6 is located radially inward from the cylindrical coil 8.

[0061] As shown in Figures 2 and 5, even if there are multiple second air intakes 6g, 6h, 6i, and 6j provided on the axial wall surface of motor 3 in the radial direction, it is desirable to have a configuration in which second air intakes are located radially inside cylindrical coil 8, such as second air intakes 6h and 6i, so that the gas sucked into motor 3 through the second air intakes flows through the coil cooling passage formed by the space within motor 3 so as to come into contact with the surface of cylindrical coil 8.

[0062] Furthermore, in order to more efficiently cool the cylindrical coil 8 by the flow of gas drawn into the motor 3 that comes into contact with the surface of the coil 8, the outer yoke 10 may be configured such that the motor exhaust holes are formed only on the side opposite to the side on the axial wall of the motor 3 where the second air intakes 6, 6g to 6j are formed, as shown in Figures 1, 2 and 5.

[0063] 1, 2, and 5, the second intake ports 6, 6g to 6j are formed on the upper side surface of the motor 3 in the axial direction as viewed in the drawings. Therefore, the outer yoke 10 may not be formed with motor exhaust holes 10a, 10c, and only motor exhaust holes 10b, 10d, which are on the lower side in the axial direction as viewed in the drawings, may be formed in the outer yoke 10.

[0064] In any case, in this embodiment, the motor 3 that drives the centrifugal fan 4 of the blower 1, 21, 31 is arranged axially inside the centrifugal fan 4. As a result, the size and thickness of the blower in the axial direction (the up-down direction in Figs. 1, 2, and 5) can be made smaller than in a structure in which the motor that drives the centrifugal fan that constitutes the blower is arranged axially outside the centrifugal fan.

[0065] Moreover, as described above, the motor 3 disposed inside the centrifugal fan 4 is provided with a coil cooling passage therein. The gas drawn into the motor 3 through the second air intakes 6, 6g to 6j of the motor 3 passes through the coil cooling passage in the motor 3, comes into contact with the coil 8 that generates heat by driving the centrifugal fan 4, flows inside the motor 3, is exhausted from the motor exhaust holes 10a to 10d, joins with the gas drawn in through the first air intakes 5 to 5d provided between the motor 3 and the centrifugal fan 4 in the radial direction, and is exhausted by the centrifugal fan 4 in a direction perpendicular to the central axis 2.

[0066] When the centrifugal fan 4 is driven, the coil 8 generates heat, and some of the gas is drawn in from the axial direction by the centrifugal fan 4, and is exhausted in a direction perpendicular to the axial direction. This gas is then drawn directly into the motor 3, comes into direct contact with the coil 8, and absorbs heat from the coil 8 before being exhausted.

[0067] In this way, the blower device of this embodiment has a reduced size and thickness in the axial direction (vertical direction in Figures 1, 2, and 5) of the blower device, and at the same time, it eliminates the risk of heat being trapped inside the motor 3, thereby suppressing heat generation by the motor 3.

[0068] Although not shown, the blower device described in this embodiment can also be used as a blower device by being disposed in a casing having an air outlet.

[0069] (Second embodiment) 6 and 7 are diagrams showing an example of an embodiment of fans 41 and 51 employing a brushless cored type motor 3a.

[0070] Since the coreless type motor 3 in the embodiment shown in Figures 1 to 5 has simply been changed to a cored type motor 3a, parts that are common to the embodiment shown in Figures 1 to 5 are given the same reference numerals and their description will be omitted.

[0071] 1 to 5 except for the configuration in which coil 18 is arranged around iron core 17, since this is a cored type. Note that the structure and configuration of brushless cored type motors are also publicly known, and therefore Figures 6 and 7 also show simplified illustrations of structural parts other than those characteristic of this embodiment, namely, the gas drawn into motor 3a through second intake ports 6g to 6j flows through coil cooling passages formed by spaces within motor 3a so as to come into contact with the surface of coil 18 and is then discharged from motor exhaust holes 10a to 10d.

[0072] In the brushless cored type motor 3a, gas is drawn into the motor 3a through the second intake ports 6g-6j, flows through the coil cooling passage formed by the space inside the motor 3a so as to come into contact with the surface of the coil 18, and is discharged through the motor exhaust ports 10a-10d, also passing between the magnets inside the motor 3a. This results in a structure in which gas passes between the north and south poles of the magnets, for example.

[0073] In this embodiment, magnet 7 is arranged on the inner peripheral wall surface of yoke 30 that constitutes the rotor, and exhaust holes continuous with motor exhaust holes 10a, 10b, 10c, and 10d formed in yoke 30 are formed as exhaust holes 7a, 7b, 7c, and 7d in magnet 7 arranged on the inner peripheral wall surface of yoke 30 at positions corresponding to the positions of motor exhaust holes 10a, 10b, 10c, and 10d.

[0074] In this embodiment as well, in order for the gas drawn into the motor 3a through the second intake ports 6, 6g to 6j to flow through the coil cooling passage formed by the space within the motor 3a so as to come into contact with the surface of the coil 18, it is desirable that the exhaust holes 7a, 7b, 7c, 7d formed in the magnet and the motor exhaust holes 10a, 10b, 10c, 10d are located radially outward of the coil 18, as shown, and that the second intake port is located radially inward of the coil 18.

[0075] In the embodiment shown in Figures 6 and 7, there are multiple second air intakes 6g, 6h, 6i, and 6j provided on the axial wall surface of the motor 3a in the radial direction, and at least second air intakes such as second air intakes 6h and 6i are located radially inward of the coil 18.

[0076] Furthermore, as explained in the first embodiment, in order to more efficiently cool the coil 18 by the flow of gas drawn into the motor 3a in contact with the surface of the coil 18, the yoke 30 may be configured such that the motor exhaust holes are formed only on the side opposite to the side on which the second air intake ports 6g to 6j are formed in the axial wall of the motor 3a, as shown in Figures 6 and 7.

[0077] In the blower devices 41 and 51 of this embodiment, the gas sucked into the motor 3a from the second air intakes 6g to 6j comes into contact with the coil 18 arranged in the motor 3a, and then is discharged from the motor exhaust holes 10a to 10d, where it joins with the gas sucked in from the first air intakes 5, 5a to 5d and is discharged in a direction perpendicular to the central axis 2, as shown by the arrows 54a to 54c.

[0078] The exhaust volume and exhaust flow rate of the exhaust air from the blowers 41, 51 in the direction perpendicular to the central axis 2 as shown by the arrows 54a to 54c are hardly reduced compared to when no flow passes through the motor 3a, even though a flow occurs within the motor 3a via the second air intakes 6g to 6j and the motor exhaust holes 10a to 10d, and as in the first embodiment, there is no significant impact on the airflow by the blowers 41, 51 for air conditioning or for heat dissipation and air cooling inside the equipment.

[0079] In the present embodiment, the air blowers 41 and 51 also come into contact with the coils 18 that generate heat within the motor 3a as they flow through the motor 3a, removing heat from the coils 18. However, the gas drawn into the motor 3a from the second air intakes 6g to 6j comes into contact with the coils 18 arranged within the motor 3a, and is then discharged from the motor exhaust holes 10a to 10d, where it joins with the gas drawn in from the first air intakes 5a to 5d and is exhausted in a direction perpendicular to the central axis 2, as shown by arrows 54a to 54c. Therefore, as with the first embodiment, there is no significant impact on the air blown by the air blowers 41 and 51 for air conditioning or for heat dissipation and air cooling within the equipment, compared to when there is no flow through the motor 3a.

[0080] Also in this embodiment, the motor 3a that drives the centrifugal fan 4 of the blower 41, 51 is arranged in the axial direction inside the centrifugal fan 4, thereby reducing the size and thickness of the blower in the axial direction (the up and down direction in Figures 6 and 7). When the centrifugal fan 4 is driven, the coil 18 generates heat, and some of the gas that is drawn in from the axial direction by the driving of the centrifugal fan 4 and exhausted in a direction perpendicular to the axial direction is drawn directly into the motor 3a, comes into direct contact with the coil 18, absorbs heat from the coil 18, and is exhausted. This eliminates the risk of heat being trapped inside the motor 3a, and suppresses heat generation by the motor 3a, just like in the first embodiment.

[0081] Furthermore, in this embodiment, as in the first embodiment, the area in the axial direction of the first air intakes 5, 5a to 5d provided between the motor 3a and the centrifugal fan 4 in the radial direction is larger than the sum of the areas in the axial direction of the second air intakes 6g to 6j (Figures 6 and 7) provided on the axial wall surface of the motor 3a.

[0082] The amount of air drawn in from the first air intakes 5, 5a to 5d in the direction in which the central axis 2 extends is greater than the amount of air drawn into the motor 3a in the direction in which the central axis 2 extends for cooling the coil 18. The large flow of gas drawn in from the first air intakes 5, 5a to 5d in the direction in which the central axis 2 extends and exhausted in a direction perpendicular to the central axis 2 merges with the flow of gas drawn into the motor 3 in the direction in which the central axis 2 extends, passes through the coil cooling passage, and is exhausted from the motor exhaust holes 10a to 10d in a direction perpendicular to the central axis 2, resulting in a structure in which, overall, air is exhausted in a direction perpendicular to the central axis 2.

[0083] Therefore, the coil 18, which generates heat to drive the motor 3a, is cooled within the motor 3a, while the structure does not interfere with the airflow for air conditioning or the airflow for heat dissipation and air cooling inside the equipment, as in the first embodiment described above.

[0084] In addition, although not shown, the blower device described in this embodiment can also be used by being placed inside a casing equipped with an air outlet. [Industrial Applicability]

[0085] The blower of the present invention can be used for air conditioning, or for blowing air for heat dissipation and cooling inside the equipment, by being employed inside air conditioners, notebook PCs, desktop PCs, tablet PCs, smartphones, game consoles, etc.

[0086] The blower device of the present invention comprises a motor that rotates around a central axis, and a centrifugal fan that is driven by the motor to rotate in the circumferential direction and consists of a plurality of blades arranged at predetermined intervals circumferentially outside the motor in the radial direction of the central axis.The rotation of the centrifugal fan draws in air through intake ports provided on one or both sides of the axial direction of the central axis and exhausts it in a direction perpendicular to the central axis, and the driving motor is arranged radially inside the centrifugal fan.

[0087] Therefore, compared to a structure in which the drive motor is disposed outside the centrifugal fan in the direction in which the central axis extends, the height of the centrifugal fan in the direction in which the central axis extends can be reduced.

[0088] Furthermore, the present invention can be used for the various applications described above as a blower device that is built into a motor and does not have the risk of heat being trapped inside the motor due to a coil that generates heat when the motor is driven.

Claims

1. a motor that rotates around a central axis; a centrifugal fan that is driven by the motor and rotates in the circumferential direction, the centrifugal fan including a plurality of blades arranged at predetermined intervals in the circumferential direction outside the motor in the radial direction of the central axis, A blower that, by rotation of the centrifugal fan, draws in air from an intake port provided on one or both sides of the central axis in the axial direction and exhausts it in a direction perpendicular to the central axis, the air intake includes a first air intake provided between the motor and the centrifugal fan in the radial direction, and a second air intake provided on a wall surface of the motor in the axial direction, The motor includes a motor exhaust hole extending radially through an axially extending outer peripheral wall of the motor, The gas drawn into the motor from the second intake port, passing through the motor, and exhausted from the motor exhaust port joins the gas drawn in from the first intake port and is exhausted in a direction perpendicular to the central axis. Blower.

2. 2. The blower device according to claim 1, wherein the gas drawn into the motor through the second intake port comes into contact with a coil disposed in the motor and is then discharged through the motor exhaust hole.

3. 3. The blower device according to claim 2, wherein the gas comes into contact with the coil through a coil cooling passage, which is a passage formed by a space within the motor and continues from the second air intake port to the motor exhaust port.

4. the motor outer peripheral wall is made of a rotor of the motor that rotates in a circumferential direction around the central axis, The centrifugal fan is supported by a fan support portion that extends radially outward from the rotor and rotates together with the rotor. The blower device according to any one of claims 1 to 3.

5. the motor includes a magnet on an inner wall surface of the rotor, The magnet has a magnet exhaust hole that communicates with the motor exhaust hole. The blower device according to claim 4.

6. The blower device of claim 4, wherein the motor comprises a coil fixedly arranged concentrically with respect to the central axis, and an inner yoke and an outer yoke sandwiching the coil radially therebetween, the outer yoke constituting the rotor.

7. The magnet is arranged on the inner wall surface of the outer yoke. The magnet has a magnet exhaust hole that communicates with the motor exhaust hole. The blower device according to claim 6.

8. A magnet is provided on the outer wall surface of the inner yoke, The magnet is provided with a magnet through-hole that passes through the magnet in the radial direction. The blower device according to claim 6.

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