JP7341936B2 - Blower - Google Patents

Description

Embodiments of the present invention relate to a blower using, for example, a centrifugal fan.

For example, a blower using a centrifugal fan consists of a fan (hereinafter also referred to as a blade), a motor that rotates the blade, an intake port provided in the direction of the rotation axis of the blade, and a direction perpendicular to the intake port. Equipped with an exhaust port. When the blade is rotated by a motor, a pressure difference is generated between the upper surface side (intake port side) and the lower surface side in the direction of the blade's rotation axis, and the motor shaft and blade are rotated in the thrust direction (rotation axis direction). ) until the blades touch the blower housing.

A technique has been developed that equalizes the pressure difference between the upper and lower surfaces of the impeller by providing pressure chambers on the upper and lower surfaces of the impeller and a valve chamber adjacent to the pressure chambers (see, for example, Patent Document 1).

In addition, multiple ring-shaped blade holding plates are installed on the top and bottom surfaces of the impeller, and the air sucked in from the intake port is discharged from the discharge port, thereby equalizing the pressure difference between the top and bottom surfaces of the impeller. There is a technique (for example, see Patent Document 2).

Japanese Patent Application Publication No. 2006-129638 Patent No. 4716750

Embodiments of the present invention provide a blower that can suppress movement of blades in the thrust direction.

The blower according to the present embodiment includes a first case having a first intake port and a first exhaust port, a second intake port provided inside the first case and communicating with the first intake port, and the first case. a second case having a second exhaust port communicating with the exhaust port; and a centrifugal device provided inside the second case, the rotation axis of which is aligned with the central axis of the first intake port and the second intake port. It includes a blade as a fan, and a motor provided inside the second case to rotate the blade, the first intake port and the second intake port are arranged concentrically, and the first intake port two side surfaces between the mouth and the second intake port are parallel to the rotation axis, and a first Form a flow path.

FIG. 1 is a top view showing a blower according to an embodiment of the present invention. 2 is a sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is an exploded perspective view showing a part of FIG. 1; FIG. 2 is an exploded perspective view showing other parts of FIG. 1; FIG. 2 is a cross-sectional view taken along line V-V in FIG. 1, showing the effect of FIG. 1; FIG. 6 is an enlarged cross-sectional view of section A in FIG. 5;

Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same parts are designated by the same reference numerals.

FIG. 1 shows a blower 10 according to this embodiment. The blower 10 includes a top case 11 as a housing, and the top case 11 has a substantially cylindrical shape and includes an intake port (first intake port) 11a and an exhaust port (first exhaust port) 11b. The intake port 11a is arranged on the upper surface of the top case 11 and in the center, and the exhaust port 11b is arranged on the side surface of the top case 11 in a direction substantially perpendicular to the intake port 11a.

As shown in FIG. 2, an inner case 12 is provided inside the top case 11. The inner case 12 is divided into a first inner case 12-1 on the lower side and a second inner case 12-2 on the upper side. However, the inner case 12 does not necessarily need to be divided, and may be integrally configured. The inner case 12 includes an intake port (second intake port) 12a that communicates with the intake port 11a of the top case 11, and an exhaust port (second exhaust port) 12b that communicates with the exhaust port 11b of the top case 11. are doing.

The diameter of the intake port 12a of the inner case 12 is larger than the diameter of the intake port 11a of the top case 11, and the intake port 11a is arranged inside the intake port 12a. Therefore, the intake port 11a and the intake port 12a are arranged concentrically.

Further, a flow path (first flow path) (CH3), which will be described later, is provided between the inner case 12 and the top case 11. That is, a part of the inner case 12 is separated from the inner surface of the top case 11, and a flow path (CH3) is formed in this part.

A base 13 is attached to the lower portions of the top case 11 and the inner case 12 with a plurality of screws 14. A substrate 15 is provided between the lower portions of the top case 11 and inner case 12 and the base 13. The substrate 15 is fixed to the base 13 with a plurality of screws 16.

A ring-shaped packing 18 as a sealing member is provided between the periphery of the substrate 15 and the top case 11, and a ring-shaped packing 19 as a sealing member is also provided between the periphery of the substrate 15 and the base 13. It will be done. The packings 18 and 19 are made of an elastic body, such as rubber. The gasket 18 closes the gap between the top case 11 and the substrate 15, and the gasket 19 closes the gap between the base 13 and the substrate 15. Therefore, the top case 11 and the base 13 are sealed, and air is prevented from leaking from the top case 11 and the base 13 to the outside.

As shown in FIGS. 2 and 3, an opening 15a is provided in the center of the substrate 15, and a stator 17a of the motor 17 is disposed inside the opening 15a. The stator 17a has a cylindrical shape and is housed in a recess 13a provided in the center of the base 13.

The diameter of the opening 15a of the substrate 15 is equal to or slightly larger than the outer diameter of the stator 17a, and a plurality of recesses 15b are provided around the opening 15a. Therefore, a plurality of gaps are formed between the substrate 15 and the stator 17a by the plurality of recesses 15b.

Furthermore, a plurality of openings 15c are provided around the substrate 15. These openings 15c are located outside the inner case 12 and inside the top case 11, and are arranged to correspond to the plurality of recesses 13b provided in the base 13.

The recess 13b of the base 13, the recess 15b of the substrate 15, and the opening 15c constitute a flow path (CH2) that communicates with the flow path (CH3) between the inner case 12 and the top case 11 described above.

The motor 17 is arranged inside the inner case 12, specifically, inside the first inner case 12-1. The motor 17 includes the aforementioned stator 17a, sleeve 17b, shaft 17c, bearing 17d, multiple coils 17e, multiple yokes 17f, rotor holder 17g, permanent magnet 17h, and shaft holder 17i. Equipped with

Sleeve 17b is provided inside stator 17a, and shaft 17c is arranged inside sleeve 17b. A fixed portion of the bearing 17d is fixed inside the sleeve 17b, and a rotating portion of the bearing 17d is fixed to the first end of the shaft 17c. The shaft 17c is held in the thrust direction by magnetic force inside the sleeve 17b by the bearing 17d. Sleeve 17b and shaft 17c may constitute an air dynamic pressure bearing. A plurality of yokes 17f around which a plurality of coils 17e are wound are arranged around the stator 17a. The shaft holder 17i is fixed to the second end of the shaft 17c, and the rotor holder 17g is held inside the shaft holder 17i. The permanent magnet 17h has a cylindrical shape and is fixed inside the rotor holder 17g. The inner surface of the permanent magnet 17h is spaced apart from the plurality of yokes 17f.

The outer surface of the shaft holder 17i is spaced apart from the inner surface of the first inner case 12-1, and the gap formed between the outer surface of the shaft holder 17i and the inner surface of the first inner case 12-1 is connected to the flow path (CH1 ) to form.

Note that the configuration of the motor 17 is not limited to the above, and can be modified.

The blade 20 is arranged inside the second inner case 12-2 and attached to the upper part of the shaft holder 17i.

As shown in FIG. 4, the blade 20 is a centrifugal fan, for example, a so-called turbo fan. However, it is not limited to turbo fans.

The blade 20 includes an intake port (third intake port) 20a, a plurality of exhaust ports (third exhaust port) 20b, and a plurality of blades 20c. The intake port 20a is provided at the center of the upper surface (first surface) 20d of the blade 20, and the plurality of exhaust ports are arranged around the blade 20. The plurality of blades 20c are arranged between the upper surface 20d and the lower surface (second surface) 20e of the blade 20, and between the intake port 20a and the plurality of exhaust ports 20b.

Further, a ring-shaped protrusion 20f is provided on the upper surface 20d of the blade 20 around the intake port 20a.

As shown in FIG. 2, when the blade 20 is disposed inside the second inner case 12-2, the intake port 20a is opposed to the intake port 11a of the top case 11 and the intake port 12a of the inner case 12. . The upper surface 20d, lower surface 20e, and side surface provided with the exhaust port 20b of the blade 20 are spaced apart from the inner surface of the second inner case 12-2 to form a gap.

Furthermore, a ring-shaped recess 12c is provided around the intake port 12a on the inner surface of the second inner case 12-2, and the protrusion 20f of the blade 20 is arranged within the recess 12c. When the protrusion 20f is disposed in the recess 12c, there is a gap between the protrusion 20f and the recess 12c, which is provided between the upper surface 20d of the blade 20 and the inner surface of the second inner case 12-2. A communicating gap is formed. This gap forms a flow path (second flow path) (CH4). The gap formed by the recess 12c and the protrusion 20f communicates with the air intake port 11a of the top case 11 and the air intake port 12a of the inner case 12.

Specifically, a ring shape is formed between the inner surface of the intake port 11a of the top case 11, the inner surface of the intake port 12a of the inner case 12, the protrusion 20f of the blade 20, and the recess 12c of the second inner case 12-2. The gaps are parallel. Therefore, the direction of air exiting from the ring-shaped flow path is parallel to the direction of air flowing into the intake port 11a of the top case 11 and the intake port 12a of the second inner case 12-2.

Further, the gap between the upper surface 20d of the blade 20 and the second inner case 12-2 is a ring-shaped gap (radially (gap in the direction orthogonal to the axis of rotation) is wider and functions as a valve chamber to control airflow. A gap similar to the upper surface 20d of the blade 20 (part of the flow path CH3) is provided between the lower surface 20e of the blade 20 and the second inner case 12-2, and the gap on the upper surface 20d side of the blade 20 and the lower surface The pressure on the upper surface 20d and lower surface 20e of the blade 20 is maintained equally by the gap on the 20e side. Therefore, movement of the blade 20 in the thrust direction is suppressed.

The ring-shaped gap between the protrusion 20f of the blade 20 and the recess 12c of the second inner case 12-2 is narrower than the gap between the upper surface 20d of the blade 20 and the second inner case 12-2, and narrows the airflow. It functions as a diaphragm (second diaphragm) 21.

Further, a ring-shaped gap between the inner surface of the intake port 12a of the second inner case 12-2 and the outer surface of the intake port 11a of the top case 11 is formed between the lower surface 20e of the blade 20 and the second inner case 12-2. It is narrower than the gap between the top case 11 and the inner case 12, and functions as a diaphragm (first diaphragm) 22 that narrows the airflow.

In this embodiment, the ring-shaped aperture 21 is arranged outside the inlet 11a and the inlet 12a, and the direction of the airflow coming out of the aperture 21 is the direction of the airflow sucked in from the inlet 11a and the inlet 12a. is parallel to In other words, the aperture 21 is arranged parallel to the inner surface of the intake port 11a of the top case 11 and the inner surface of the intake port 12a of the inner case 12.

The ring-shaped aperture 22 is arranged between the inlet 11a and the inlet 12a, and the direction of the airflow coming out of the aperture 22 is parallel to the direction of the airflow coming out of the inlet 11a, the inlet 12a, and the aperture 21. It is. That is, the aperture 22 is arranged parallel to the aperture 21.

(effect)
The operation of the blower 10 will be described with reference to FIGS. 5 and 6.

When the motor 17 is driven and the blade 20 is rotated, air introduced from the intake port 11a of the top case 11 and the intake port 12a of the inner case 12 is guided to the intake port 20a of the blade 20, and the air is discharged from the blade 20. The air is discharged from the port 20b, the exhaust port 12b of the inner case 12, and the exhaust port 11b of the top case 11.

On the other hand, a part of the air inside the inner case 12 flows through the flow path CH1 between the motor 17 and the inner case 12 (first inner case 12-1), the opening 15a of the substrate 15, the recess 15b, and the recess of the base 13. 13b, a flow path CH2 passing through the opening 15c of the substrate 15, a flow path CH3 between the top case 11 and the inner case 12, and an air intake port 11a of the top case 11 and the air intake port of the inner case 12 through the aperture 22. 12a and is introduced into the intake port 20a of the blade 20.

In this way, the air below the blade 20 passes through the channels CH1, CH2, CH3, and the throttle 22, is guided to the upper side of the inner case 12 (above the blade 20), and is introduced into the air intake port 11a of the top case 11. The air is introduced into the air intake port 20a of the blade 20 along with the air introduced from the air intake port 20a. Therefore, it is possible to suppress movement of the blade 20 in the thrust direction.

Furthermore, a part of the air in the inner case 12 flows through the flow path CH4 between the upper surface (first surface) 20d of the blade 20 and the inner case 12 (second inner case 12-2), and the aperture 21. The air is introduced into the air intake port 20a of the blade 20 along with the air passing through the channel CH3, the throttle 22, and the air introduced from the air intake port 11a of the top case 11. Furthermore, the direction of air introduced from the throttle 21 into the intake port 20a of the blade 20 is parallel to the direction of air passing through the throttle 22 and the direction of air introduced from the intake port 11a of the top case 11. Therefore, the airflow introduced from the intake port 11a of the top case 11, the airflow from the throttle 22, and the airflow from the throttle 21 are combined and introduced into the blades 20. Therefore, it is possible to further suppress movement of the blade 20 in the thrust direction.

(Effects of embodiment)
According to the above embodiment, the blower 10 includes the top case 11 and the inner case 12 provided inside the top case 11, and the motor 17 and the blade 20 are arranged inside the inner case 12. Flow paths CH1, CH2, and CH3 are formed between the top case 11 and the inner case 12, respectively. Therefore, air leaking from the inner case 12 into the top case 11 passes through the flow channels CH1, CH2, CH3 and the aperture 22 provided between the top case 11 and the inner case 12, and enters the top case 11. The air is guided to the air intake port 20a of the blade 20 from between the air intake port 11a and the air intake port 12a of the inner case 12. Therefore, movement of the blade 20 in the thrust direction can be suppressed, and the blade 20 can be prevented from contacting the inner case 12.

Moreover, the blower 10 has a double structure including a top case 11 and an inner case 12. Therefore, the air flow generated by the rotation of the blade 20 is exhausted from the exhaust port 11b of the top case 11, and air can be prevented from leaking from other parts of the top case 11.

Further, according to the above embodiment, the inner case 12 has a ring-shaped recess 12c around the intake port 12a, and the blade 20 has a ring-shaped recess 12c around the intake port 20a. It has a protrusion 20f, and a ring-shaped aperture 21 is formed around the intake port 11a and the intake port 12a by the recess 12c and the protrusion 20f. Moreover, the direction of air introduced from the throttle 21 to the intake port 20a of the blade 20 is the direction of air passing through the throttle 22 between the top case 11 and the inner case 12, and the direction of air introduced from the intake port 11a of the top case 11. parallel to the direction of the air. Therefore, the airflow introduced from the intake port 11a of the top case 11, the airflow from the throttle 22, and the airflow from the throttle 21 are combined and introduced into the blades 20. Therefore, movement of the blade 20 in the thrust direction can be further suppressed, and contact between the blade 20 and the inner case 12 can be prevented.

Further, the direction of the aperture 21 is parallel to the aperture 22, the side surface of the air intake port 11a, and the side surface of the air intake port 12a. Therefore, even if the blade 20 moves in the thrust direction, the width of the gap between the concave portion 12c and the protrusion 20f that constitute the throttle 21 does not change in the direction intersecting the rotation axis. Therefore, when the rotation speed of the blade 20 is constant, the amount of air introduced from the throttle 21 to the intake port 20a can be kept constant, and the movement of the blade 20 in the thrust direction can be stably suppressed. At the same time, the dimensions of the diaphragm 21 can be easily managed.

The aperture 22 is formed by arranging the intake port 12a of the second inner case 12-2 concentrically with the intake port 11a of the top case 11. Therefore, similarly to the diaphragm 21, even when the second inner case 12-2 (inner case 12) is disposed offset in the thrust direction with respect to the top case 11, the width of the diaphragm 22 is the same as the rotation axis. does not change in the direction that intersects with Therefore, it is possible to easily manage the dimensions of the aperture 22.

Further, the direction of air introduced from the apertures 21 and 22 into the intake port 20a of the blade 20 is parallel to the direction of air introduced from the intake port 11a of the top case 11. Therefore, compared to the case where the throttle 21 and the throttle 22 are arranged perpendicularly (radially) to the intake port 11a of the top case 11, there is less flow loss, and furthermore, it is possible to reduce noise. .

Specifically, the air introduced from the air intake port 11a of the top case 11 to the air intake port 20a of the blade 20 gradually changes its direction in the right angle direction toward the exhaust port 20b. Therefore, the airflow from the throttle 22, which is closer to the intake port 20a than the throttle 21, is merged more smoothly with the airflow introduced from the intake port 20a than the airflow from the throttle 21, resulting in loss of flow rate and noise. is reduced.

In addition, the present invention is not limited to the above-mentioned embodiments as they are, and in the implementation stage, the constituent elements can be modified and embodied without departing from the spirit of the invention. Moreover, various inventions can be formed by appropriately combining the plurality of constituent elements disclosed in each of the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components of different embodiments may be combined as appropriate.

10...Blower, 11...Top case (first case), 11a...Intake port (first intake port), 11b...Exhaust port (first exhaust port), 12...Inner case (second case), 12a...Intake port (second intake port), 12b...exhaust port (second exhaust port), 17...motor, 18, 19...packing, 20...blade, 20a...intake port (third intake port), 20b...exhaust port (third exhaust port), CH1... channel, CH2... channel, CH3... first channel, CH4... second channel, 21... throttle (second throttle), 22... throttle (first throttle).

Claims (4)

a first case having a first intake port and a first exhaust port;
a second case provided inside the first case and having a second intake port communicating with the first intake port and a second exhaust port communicating with the first exhaust port;
a blade serving as a centrifugal fan installed inside the second case and having a rotation axis aligned with a central axis of the first intake port and the second intake port;
a motor provided inside the second case and rotating the blade;
Equipped with
The first intake port and the second intake port are arranged concentrically, and two side surfaces between the first intake port and the second intake port are parallel to the rotation axis, and the first case and the second intake port are parallel to the rotation axis. A blower characterized by forming a first flow path that guides air between two cases to the first intake port and the second intake port. The second case has a ring-shaped recess provided on a surface facing the blade around the second intake port,
The blade has a ring-shaped protrusion disposed in the recess on a first surface on the side of the first intake port and the second intake port,
Between the recessed portion and the protrusion, two side surfaces parallel to the rotation axis direct air from surfaces corresponding to the first intake port and the second intake port of the blade to the first intake port and the second intake port. The blower according to claim 1, characterized in that the blower is a second flow path leading to a second intake port. The blower according to claim 2, wherein the gap in the direction perpendicular to the rotation axis of the first flow path is narrower than the gap between the first case and the second case, and forms a first throttle. . The gap in the direction perpendicular to the rotation axis of the second flow path is narrower than the gap between the second case and a surface corresponding to the first intake port and the second intake port of the blade, and 4. The blower according to claim 3, further comprising a diaphragm.

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