BLOWER

Abstract

A blower includes a first axial fan, a second axial fan, a first current plate, and a holder. The second axial fan is located on one side in the axial direction with respect to the first axial fan. In the first current plate, first hollow cells partitioned by a lattice-shaped first partition wall and penetrating in the axial direction are two-dimensionally arranged. The holder holds the first current plate. The first axial fan is connected in series with the second axial fan in the axial direction via the first current plate and the holder. The holder includes a support portion that includes opening portions opened in the axial direction and is located on one side in the axial direction of the first current plate. Rigidity of the support portion is higher than rigidity of the first current plate.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2022-160043, filed on Oct. 4, 2022, the entire contents of which are hereby incorporated herein by reference.

1. FIELD OF THE INVENTION

The present disclosure relates to a blower.

2. BACKGROUND

A blower in which a plurality of axial fans are connected in series in an axial direction to increase the air blowing amount has been known conventionally. For example, a structure (for example, honeycomb structure) having a plurality of perforations is disposed between the exhaust port of a first axial fan at the preceding stage and the intake port of a second axial fan at the subsequent stage. The airflow delivered from the exhaust port of the first axial fan is rectified by the structure and flows into the intake port of the second axial fan.

However, conventionally, the structure is pushed by the airflow delivered from the first axial fan. The impeller of the second axial fan is disposed on the intake port side. Therefore, at least a part of the structure may move into the intake port of the second axial fan, and may interfere with the impeller of the second axial fan.

SUMMARY

An example embodiment of a blower according to the present disclosure includes a first axial fan, a second axial fan, a first current plate, and a holder. The second axial fan is located on one side in the axial direction with respect to the first axial fan. In the first current plate, first hollow cells which are partitioned by a lattice-shaped first partition wall and penetrating in the axial direction are two-dimensionally arranged. The holder holds the first current plate. The first axial fan is connected in series with the second axial fan in the axial direction via the first current plate and the holder. The holder includes a support portion. The support portion includes opening portions opened in the axial direction, and is located on one side in the axial direction of the first current plate. The rigidity of the support portion is higher than rigidity of the first current plate.

The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the example embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal sectional view illustrating a configuration of a blower according to an example embodiment of the present disclosure.

FIG. 2 is a perspective view illustrating the appearance of a blower.

FIG. 3 is a perspective view illustrating an example configuration a holder according to an example embodiment of the present disclosure.

FIG. 4 is a perspective view illustrating a configuration of a first modification of a holder according to an example embodiment of the present disclosure.

FIG. 5 is a perspective view illustrating a configuration of a second modification of a holder according to an example embodiment of the present disclosure.

DETAILED DESCRIPTION

Hereinafter, example embodiments will be described with reference to the drawings.

Note that in the present specification, in a blower 100, a direction parallel to a central axis CA is referred to as an “axial direction”. In the axial directions, a direction from a first axial fan 1 to a second axial fan 2 is referred to as “one axial direction D1”, and a direction from the second axial fan 2 to the first axial fan 1 is referred to as “the other axial direction D2”. In addition, a direction orthogonal to the central axis CA is referred to as a “radial direction”, and a rotational direction around the central axis CA is referred to as a “circumferential direction”. In the radial directions, a direction approaching the central axis CA is referred to as “radially inward”, and a direction away from the central axis CA is referred to as “radially outward”.

In this specification, an “annular shape” includes not only a shape continuously connected without any cut along the entire circumference in the circumferential direction around the central axis CA but also a shape having one or more cuts in a part of the entire circumference around the central axis CA. The “annular shape” also includes a shape having a closed curve on a curved surface that intersects the central axis CA around the central axis CA.

In addition, in a positional relationship between any one of an azimuth, a line, and a plane and another, “parallel” includes not only a state in which both of them do not intersect at all no matter how long they extend, but also a state in which they are substantially parallel. In addition, “perpendicular” and “orthogonal” include not only a state in which both of them intersect each other at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal. In other words, each of “parallel”, “perpendicular”, and “orthogonal” includes a state in which the positional relationship between the two of them permits an angular deviation to a degree not departing from the spirit of the present disclosure.

It is to be noted that the above names are names used merely for description, and are not intended to limit actual positional relationships, directions, names, and the like.

FIG. 1 is a longitudinal sectional view illustrating an example configuration of the blower 100 according to an example embodiment. FIG. 2 is a perspective view illustrating the appearance of the blower 100. FIG. 3 is a perspective view illustrating an example configuration of a holder 4 to be described later. Note that FIG. 1 is a cross-sectional view of the blower 100 taken along an alternate long and short dash line I-I in FIG. 2, and shows a cross-sectional structure of the blower 100 taken along a virtual plane perpendicular to the axial direction. FIG. 3 illustrates a first axial fan 1, a current plate 3, and a holder 4, which will be described later, as viewed from one axial direction D1 toward the other axial direction D2. In other words, FIG. 3 is a perspective view of the blower 100 excluding a second axial fan 2 to be described later.

As illustrated in FIG. 1, the blower 100 includes the first axial fan 1, the second axial fan 2, the current plate 3, the holder 4, and a locking portion 5. The current plate 3 is an example of a “first current plate” of the present disclosure. The blower 100 is a serial axial fan in which the first axial fan 1 at a preceding stage and the second axial fan 2 at a subsequent stage are connected in series with the current plate 3 and the holder 4 interposed therebetween.

The first axial fan 1 is connected in series with the second axial fan 2 in the axial direction via the current plate 3 and the holder 4. The second axial fan 2 is disposed on the one axial direction D1 side with respect to the first axial fan 1. That is, the first axial fan 1 is disposed at the subsequent stage (the other axial direction D2 side) of the current plate 3 and the holder 4. The second axial fan is disposed at the preceding stage of the current plate 3 and the holder 4 (on the one axial direction D1 side). Each of the first axial fan 1 and the second axial fan 2 sucks an airflow F from the opening (that is, intake port) disposed at the other axial end, and sends out the airflow F in the one axial direction D1 from the opening (that is, exhaust port) disposed at the one axial end. The airflow F delivered from the first axial fan 1 is rectified by the current plate 3 and sucked by the second axial fan 2. The holder 4 holds the current plate 3. Specifically, the holder 4 includes a support portion 41. The support portion 41 has a plurality of opening portions 410 opened in the axial direction, and is disposed on the one axial direction D1 side of the current plate 3.

The intake port of the second axial fan 2 is connected to the exhaust port of the first axial fan 1 via the current plate 3 and the support portion 41. Thus, the airflow F delivered from the first axial fan 1 to the second axial fan 2 can be rectified. Therefore, noise generated when the airflow F flows can be reduced.

The rigidity of the support portion 41 is higher than the rigidity of the current plate 3. Thus, at least a part of the current plate 3 can be prevented from moving into the second axial fan 2. Therefore, it is possible to prevent the current plate 3 disposed between the axial fans 1 and 2 connected in series from interfering with the components (for example, a second impeller 21 to be described later, particularly a second rotor blade 211) in the second axial fan 2 at the subsequent stage. Accordingly, the life of the blower 100 can be extended.

The first axial fan 1 includes a first impeller 11 and a first motor 12. The first impeller 11 includes a first rotor blade 111. The first rotor blade 111 is rotatable about the central axis CA extending in the axial direction. The first motor 12 drives the first impeller 11 to rotate the first rotor blade 111. The first impeller 11 is an example of an “impeller” of the present disclosure. The first motor 12 is an example of a “motor” of the present disclosure. The first rotor blade 111 is an example of a “rotor blade” of the present disclosure.

The first motor 12 is disposed on the one axial direction D1 side with respect to the first impeller 11. One axial end of the first motor 12 opposes a part of the current plate 3 or the holder 4 with a gap in the axial direction. However, the present disclosure is not limited to this example, and one axial end of the first motor 12 may be in contact with a part of the current plate 3 or the holder 4.

The first axial fan 1 further includes a first housing 13. The first housing 13 is an example of a “housing” of the present disclosure. The first housing 13 has a tubular shape extending in the axial direction and accommodates the first impeller 11 and the first motor 12.

The first axial fan 1 further includes a first connecting portion 14. The first connecting portion 14 is an example of a “connecting portion” of the present disclosure. The first connecting portion 14 connects the first housing 13 and the first motor 12, and supports the first motor 12. A plurality of first connecting portions 14 are arranged in the circumferential direction. Each of the first connecting portions 14 extends at least in the radial direction. A radially inner end of the first connecting portion 14 is connected to the first motor 12. A radially outer end of the first connecting portion 14 is connected to the inner surface of the first housing 13. Each of the first connecting portions 14 extends in the axial direction and faces the current plate 3 in the axial direction. The first connecting portion 14 functions as a stator vane that rectifies the airflow F delivered from the first axial fan 1. In particular, at least one of the first connecting portions 14 may have an airfoil shape.

Preferably, one axial end of the first connecting portion 14 is in contact with the other axial end surface of the current plate 3. However, the present disclosure is not limited to this example, and at least some of the one axial ends of the first connecting portions 14 may face the other axial end surface of the current plate 3 with a gap therebetween.

The second axial fan 2 includes a second impeller 21, a second motor 22, a second housing 23, and a plurality of second connecting portions 24. The second impeller 21 includes a second rotor blade 211. The second rotor blade 211 is rotatable about the central axis CA extending in the axial direction. The second motor 22 drives the second impeller 21 to rotate the second rotor blade 211. As a result, the second axial fan 2 sucks the airflow F delivered from the first axial fan 1 via the current plate 3 at the other axial end of the second axial fan 2. The second axial fan 2 accelerates the flow velocity of the airflow F flowing in the one axial direction D1, and sends out the airflow F from the one axial end of the second axial fan 2 in the one axial direction D1 of the blower 100. The second connecting portion 24 functions as a stator vane that rectifies the airflow F delivered from the second axial fan 2. In particular, at least one of the second connecting portions 24 may have an airfoil shape.

The second impeller 21 is disposed on the other axial direction D2 side with respect to the second motor 22, and faces the current plate 3 and the support portion 41 with a gap in the axial direction. The second housing 23 has a tubular shape extending in the axial direction and accommodates the second impeller 21 and the second motor 22. Each of the second connecting portions 24 connects the second housing 23 and the second motor 22, and supports the second motor 22.

The current plate 3 rectifies the airflow F delivered from the first axial fan 1 in the one axial direction D1. The second axial fan 2 sucks the airflow F rectified by the current plate 3. The rectified airflow F has a small swirl component and easily flows in the axial direction by the second axial fan 2. Accordingly, the pressure and the air volume of the airflow F delivered from the second axial fan 2 are increased. As a result, the amount of air sucked or delivered by the blower 100 can be increased. Therefore, the air blowing efficiency of the blower 100 can be further improved. The material of the current plate 3 is aluminum in the present example embodiment, but is not limited to this example, and may be a resin material, another metal material, a ceramic material, or the like.

The current plate 3 includes a plurality of hollow cells 30 and a partition wall 31. The hollow cells 30 each are partitioned by the lattice-shaped partition wall 31, and penetrate in the axial direction. In the current plate 3, a plurality of hollow cells 30 are two-dimensionally arranged. The hollow cell 30 is an example of a “first hollow cell” of the present disclosure, and the partition wall 31 is an example of a “first partition wall” of the present disclosure. As described above, the blower 100 includes the current plate 3.

In the present example embodiment, the current plate 3 has a honeycomb structure in which hexagonal hollow cells 30 are two-dimensionally arranged when viewed from the axial direction. By adopting the honeycomb structure for the current plate 3, rigidity of the current plate 3 can be enhanced. In addition, the flow resistance of the airflow F can be reduced by improving the rectifying effect of the airflow F delivered from the first axial fan 1. Therefore, the pressure-air volume characteristics of the blower 100 can be enhanced. However, the present disclosure is not limited to this example. The shape of the hollow cell 30 as viewed from the axial direction may be a polygonal shape other than the hexagonal shape, a circular shape, or the like.

The holder 4 includes a base portion 42 and a holding tube portion 43 in addition to the support portion 41 described above.

The base portion 42 has a plate shape extending in a direction (for example, a radial direction) intersecting the axial direction. The base portion 42 overlaps the first motor 12 when viewed from the axial direction.

Preferably, the outer edge portion of the base portion 42 overlaps the outer edge portion of the other axial end of the first motor 12 when viewed from the axial direction. Alternatively, the outer edge portion of the base portion 42 is located radially inward of the outer edge portion of the other axial end of the first motor 12. With such a configuration, the interval between the base portion 42 and the holding tube portion 43 (that is, the radial width of the wind tunnel through which the airflow F flows) can be made equal to or larger than the interval between the first housing 13 and the outer edge portion of the other axial end of the first motor 12. Therefore, it is possible to prevent a decrease in the pressure-air volume characteristics of the blower 100. However, this example does not exclude a configuration in which the outer edge portion of the base portion 42 is located radially outward from the outer edge portion of the other axial end of the first motor 12.

The holding tube portion 43 has a tubular shape extending in the axial direction and surrounds the base portion 42. One axial end of the first housing 13 is connected to the other axial end of the second housing 23 in the axial direction via the holding tube portion 43. Alternatively, one axial end of the first housing 13 may be connected to the other axial end of the second housing 23 also via the radially outer end of the current plate 3.

In the present example embodiment, one axial end of the holding tube portion 43 abuts on the other axial end of the second housing 23. The other axial end of the holding tube portion 43 abuts on one axial end of the first housing 13. Thus, the airflow F can be prevented from flowing in the radial direction between the one axial end of the first housing 13 and the other axial end of the second housing 23. Therefore, it is possible to prevent a decrease in the air volume of the blower 100 and to prevent the occurrence of turbulence at one axial end (that is, exhaust port) of the first housing 13 and the other axial end (that is, intake port) of the second housing 23.

In the present example embodiment, the annular current plate 3 is disposed between the base portion 42 and the holding tube portion 43. At least a part of the radially inner end of the current plate 3 is in contact with the radially outer end of the base portion 42. At least a part of the radially outer end of the current plate 3 is in contact with the radially inner end of the base portion 42. In other words, the current plate 3 is fitted into an annular recess formed by the support portion 41, the base portion 42, and the holding tube portion 43. The recessed portion is recessed in the one axial direction D1 and extends in the circumferential direction.

All of the current plates 3 may be fitted in the recessed portion, or only some of the current plates 3 may be fitted in the recessed portion. That is, at least some of the current plates 3 may be annular and may be disposed between the base portion 42 and the holding tube portion 43. With such a configuration, the current plates 3 are held in a state where at least some of them are fitted between the base portion 42 and the holding tube portion 43. Therefore, positional displacement of the current plates 3 with respect to the holder 4 can be prevented. Furthermore, since the current plate 3 and the holder 4 can be handled as one assembly, the blower 100 can be easily assembled, and workability thereof is improved.

Next, the base portion 42 and the holding tube portion 43 are connected by a support portion 41. A radially inner end of the support portion 41 is connected to one axial end of the base portion 42. A radially outer end of the support portion 41 is connected to one axial end of the holding tube portion 43.

In the present example embodiment, the support portion 41 further includes a plurality of support ribs 411. The plurality of support ribs 411 extend from the radially outer end of the base portion 42 to the holding tube portion 43 and are arranged in the circumferential direction. At least a part of the radially outer end of the support rib 411 is connected to the radially inner surface of the holding tube portion 43. The opening portion 410 is a gap between the support ribs 411 adjacent in the circumferential direction. In other words, the opening portion 410 is a space surrounded by the support ribs 411 adjacent to each other in the circumferential direction, the radially outer end of the base portion 42, and the radially inner end of the holding tube portion 43. Thus, the one axial end of the current plate 3 can be supported by the plurality of support ribs 411 while widening the opening portion 410 formed between the support ribs 411 adjacent in the circumferential direction. Therefore, the holder 4 can hold the current plate 3 without deteriorating the pressure-air volume characteristics of the blower 100. Each support rib 411 may or may not have an airfoil shape.

Preferably, the other axial end of the support rib 411 is in contact with one axial end face of the current plate 3. Thus, the current plate 3 can be sandwiched and held between the first connecting portion 14 and the support rib 411. However, the present disclosure is not limited to this example, and the other axial ends of at least some of the support ribs 411 may face the one axial end surface of the current plate 3 with a gap.

Preferably, at least some of the opening portions 410 of the support portion 41 has a shape extending in the axial direction. In other words, in at least one set of the support ribs 411 adjacent to each other in the circumferential direction, the support ribs 411 extend in the axial direction. For example, the axial width of the support rib 411 (that is, opening portion 410) is equal to or larger than the circumferential width of the support rib 411. Thus, the support rib 411 can provide a rectifying effect to the airflow F passing through the opening portion 410. However, this example does not exclude a configuration in which all the opening portions 410 do not have a shape extending in the axial direction. For example, the axial width of all the support ribs 411 (that is, the opening portions 410) may be narrower than the circumferential width of the support ribs 411.

Preferably, a minimum opening area of the opening portion 410 is equal to or larger than a maximum opening area of the hollow cell 30 of the current plate 3 when viewed from the axial direction. By making the opening area of all the opening portions 410 equal to or larger than the hollow cell 30, the flow resistance of the airflow F passing through the opening portions 410 can be reduced. Therefore, it is possible to prevent a decrease in the pressure-air volume characteristics of the blower 100. However, this example does not exclude a configuration in which the minimum opening area of the opening portion 410 is less than the maximum opening area of the hollow cell 30 when viewed from the axial direction.

Next, in the present example embodiment, the support rib 411 extends in a direction opposite to the first connecting portion 14 of the first axial fan 1 in the circumferential direction. For example, as illustrated in FIG. 3, the first connecting portion 14 extends toward one circumferential direction as going radially outward. On the other hand, the support rib 411 extends toward the other circumferential direction as going radially outward. By reversing the direction in which the first connecting portion 14 and the support rib 411 extend in the circumferential direction, the swirling component (circumferential component) of the airflow F flowing in the axial direction can be reduced.

However, this example does not exclude a configuration in which the support rib 411 does not extend in the direction opposite to the first connecting portion 14 in the circumferential direction. FIG. 4 is a perspective view illustrating a configuration of a first modification of the holder 4. FIG. 5 is a perspective view illustrating a configuration of a second modification of the holder 4. FIGS. 4 and 5 illustrate the first axial fan 1, the current plate 3, and the holder 4 as viewed from one axial direction D1 to the other axial direction D2. In other words, FIGS. 4 and 5 are perspective views of the blower 100 excluding the second axial fan 2.

For example, as shown in FIG. 4, at least one support rib 411 may extend in the radial direction from the base portion 42. Thus, the length of the support rib 411 extending in the radial direction can be further shortened, so that the strength of the support portion 41 can be improved.

Alternatively, as illustrated in FIG. 5, the support portion 41 may further include a current plate 412. The current plate 412 is an example of a “second current plate” of the present disclosure, and is disposed between the base portion 42 and the holding tube portion 43. The current plate 412 includes a plurality of hollow cells 4120 and a partition wall 4121. The hollow cells 4120 each are partitioned by a lattice-shaped partition wall 4121 and penetrate in the axial direction. In the current plate 3, the hollow cells 4120 are two-dimensionally arranged. In FIG. 5, the opening portion 410 is the hollow cell 4120 of current plate 412. The hollow cell 4120 is an example of a “second hollow cell” of the present disclosure, and the partition wall 4121 is an example of a “second partition wall” of the present disclosure. Consequently, the strength of the support portion 41 can be improved by current plate 412. In addition, the flow resistance of the airflow F can be reduced by further improving the rectifying effect of the airflow F delivered from the first axial fan 1.

In FIG. 5, the current plate 412 has a honeycomb structure in which hexagonal hollow cells 4120 are two-dimensionally arranged when viewed from the axial direction. By adopting the honeycomb structure for the current plate 412, the strength of the current plate 412 and the support portion 41 can be further improved. In addition, the flow resistance of the airflow F can be reduced by further improving the rectifying effect of the airflow F through the current plate 3. Therefore, the pressure-air volume characteristics of the blower 100 can be further enhanced. However, the present disclosure is not limited to this example. The shape of the hollow cell 4120 as viewed from the axial direction may be a polygonal shape other than the hexagonal shape, a circular shape, or the like.

Note that the configurations of the support portions 41 in FIGS. 3 to 5 can be combined as long as there is no particular contradiction. For example, the current plate 412 may be disposed in at least a part of a region surrounded by the support rib 411, the base portion 42, and the holding tube portion 43 when viewed from the axial direction.

Next, the locking portion 5 locks the holder 4 and the first motor 12 (see FIG. 1). Specifically, the locking portion 5 has a so-called snap-fit structure and is disposed on the holder 4. For example, the locking portion 5 includes an elastic piece 51 and a claw portion 52. The elastic piece 51 has high elasticity and is bendable in the radial direction, and protrudes from the base portion 42 in the other axial direction D2. The claw portion 52 protrudes radially inward from the tip (the other end in the axial direction) of the elastic piece 51 and is locked to a locked portion (not illustrated) arranged on the radially outer surface of the first motor 12.

Note that the present disclosure is not limited to the example of the present example embodiment, and the locking portion 5 may be disposed in the first motor 12. That is, the elastic piece 51 may protrude from the first motor 12 in the one axial direction D1. The claw portion 52 may protrude radially inward from the tip (one end in the axial direction) of the elastic piece 51 and may be locked to the radially outer surface of the base portion 42 or a locked portion (not illustrated) arranged at the radially outer end.

That is, the locking portion 5 is disposed on one member of the base portion 42 and the first motor 12, and is locked to the other member. Thus, the base portion 42 and the first motor 12 can be easily connected to each other by the locking portion 5 such as a snap-fit part. Therefore, the blower 100 can be easily assembled, and the workability is improved.

The example embodiments of the present disclosure have been described above. It is to be noted that the scope of the present disclosure is not limited to the above-described example embodiments. The present disclosure is implemented by adding various modifications to the above-described example embodiments within a range not departing from the spirit of the disclosure. In addition, the matters described in the above-described example embodiments are arbitrarily combined together as appropriate within a range where no inconsistency occurs.

Example embodiments of the present disclosure are useful in a device in which axial fans are connected in series.

Features of the above-described example embodiments and the modifications thereof may be combined appropriately as long as no conflict arises.

While example embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.

Claims

1. A blower comprising: a first axial fan;a second axial fan located on one side in an axial direction with respect to the first axial fan;a first current plate in which first hollow cells, partitioned by a lattice-shaped first partition wall and penetrating in the axial direction, are two-dimensionally arranged; anda holder that holds the first current plate; whereinthe first axial fan is connected in series with the second axial fan in the axial direction via the first current plate and the holder;the holder includes a support portion that includes opening portions opened in the axial direction and is located on one side in the axial direction of the first current plate; andrigidity of the support portion is higher than rigidity of the first current plate.

2. The blower according to claim 1, wherein an intake port of the second axial fan is connected to an exhaust port of the first axial fan via the first current plate and the support portion.

3. The blower according to claim 1, wherein at least some of the opening portions of the support portion have a shape extending in the axial direction.

4. The blower according to claim 1, wherein the first current plate includes a honeycomb structure in which the first hollow cells each having a hexagonal shape when viewed from the axial direction are two-dimensionally arranged.

5. The blower according to claim 1, wherein the first axial fan includes: an impeller including a rotor blade rotatable about a central axis extending in the axial direction;a motor that drives the impeller to rotate the rotor blade;a housing having a tubular shape extending in the axial direction and accommodating the impeller and the motor; anda connecting portion that connects the housing and the motor and supports the motor;the holder further includes: a base portion that overlaps the motor when viewed from the axial direction; anda holding tube portion that has a tubular shape extending in the axial direction and surrounds the base portion;the support portion further includes support ribs extending from a radially outer end of the base portion to the holding tube portion and arranged in a circumferential direction; andat least a portion of radially outer ends of the support ribs is connected to a radially inner surface of the holding tube portion.

6. The blower according to claim 5, wherein at least a portion of the first current plate has an annular shape, and is located between the base portion and the holding tube portion.

7. The blower according to claim 5, wherein at least one of the support ribs extends in the radial direction from the base portion.

8. The blower according to claim 5, wherein the connecting portion extends in one circumferential direction radially outward; andthe support ribs extend toward another circumferential direction radially outward.

9. The blower according to claim 1, wherein the first axial fan includes: an impeller including a rotor blade rotatable about a central axis extending in the axial direction; anda motor that drives the impeller to rotate the rotor blade;the holder further includes: a base portion that overlaps the motor when viewed from the axial direction; anda holding tube portion that has a tubular shape extending in the axial direction and surrounds the base portion;the support portion further includes a second current plate located between the base portion and the holding tube portion; andthe opening portions are second hollow cells of the second current plate, the second hollow cells being partitioned by a lattice-shaped second partition wall and two-dimensionally arranged.

10. The blower according to claim 9, wherein the second current plate has a honeycomb structure in which the second hollow cells each having a hexagonal shape when viewed from the axial direction are two-dimensionally arranged.

11. The blower according to claim 5, wherein a minimum opening area of the opening portions is equal to or larger than a maximum opening area of the first hollow cells of the first current plate when viewed from the axial direction.

12. The blower according to claim 5, wherein when viewed from the axial direction, an outer edge portion of the base portion:overlaps an outer edge portion of another axial end of the motor; oris located radially inward of the outer edge portion of the other axial end of the motor.

13. The blower according to claim 5, further comprising a lock provided on one of the base portion and the motor, and is locked to another one of the base portion and the motor.