Blower device and dryer

Abstract

To provide a blower device and a dryer capable of suppressing noise.SOLUTION: A blower device 2 provided in a dryer 1 includes: an impeller 10 which has a plurality of blades 11 arranged in a rotation direction R; and a housing 30 for storing the impeller 10. The plurality of blades 11 extends in the radial direction of the impeller 10. The housing 30 includes: an inflow port 32 of a fluid; an outflow port 33 of a fluid; and a cover 20 for covering the inflow port 32. The cover 20 includes a plurality of extension parts 21 which are curved portions extending in the rotation direction R of the impeller 10. Out of the plurality of extension parts 21, between the two extension parts 21 adjacent to each other, an opening 22 is formed. The pressure of the fluid between the plurality of extension parts 21 and the impeller 10 is adjusted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blower device and a dryer. [Background technology]

[0002] The blower device is used in a dryer or the like (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-16094 A Summary of the Invention [Problem to be solved by the invention]

[0004] There has been a demand for a blower device that does not generate noise.

[0005] Therefore, an object of the present invention is to provide a blower and a dryer that can suppress noise. [Means for solving the problem]

[0006] A dryer according to one embodiment of the present invention comprises an impeller having a plurality of blades arranged in a rotational direction, and a housing that accommodates the impeller, the plurality of blades extending in a radial direction of the impeller, the housing having a fluid inlet, a fluid outlet, and a cover covering the inlet, the cover having a plurality of extension portions that are curved portions extending in the rotational direction of the impeller, an opening is formed between two adjacent extension portions of the plurality of extension portions, and the pressure of the fluid between the plurality of extension portions and the impeller is adjusted. [Brief description of the drawings]

[0007] [Figure 1]1 is a perspective view showing a schematic external appearance of a dryer according to an embodiment of the present invention, which is provided with a blower device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of the dryer of FIG. [Diagram 3] FIG. 2 is a rear view of the dryer of FIG. [Figure 4] FIG. 2 is a right side view of the dryer of FIG. 1. [Diagram 5] FIG. 2 is a left side view of the dryer of FIG. 1. [Figure 6] FIG. 2 is a plan view of the dryer of FIG. 1. [Figure 7] FIG. 2 is a bottom view of the dryer of FIG. 1. [Figure 8] 2 is a cross-sectional view showing a cross section perpendicular to the axis of a blower in the dryer of FIG. 1. [Figure 9] 2 is a cross-sectional view showing a cross section of the blower taken along a plane including an axis. FIG. [Figure 10] FIG. 2 is a perspective view of a cover provided in the blower device. [Figure 11] FIG. 2 is a perspective view of a cover provided in the blower device. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. 11 is a perspective view showing a cover according to a modified example. [Figure 15] 13 is a cross-sectional view showing a cross section perpendicular to the axis of a blower device including a cover according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view that shows a schematic appearance of a dryer 1 according to an embodiment of the present invention that includes a blower device 2 according to an embodiment of the present invention. FIGS. 2 to 7 are a front view, a rear view, a right side view, a left side view, a plan view, and a bottom view of the dryer 1 according to the embodiment of the present invention, respectively. FIG. 8 is a cross-sectional view showing a cross section perpendicular to the axis x of the blower device 2 in the dryer 1, and FIG. 9 is a cross-sectional view showing a cross section of the blower device 2 along a plane including the axis x. In the drawings, not all of the members are labeled with reference numerals, and some of the reference numerals may be omitted. The dryer 1 is a hair dryer intended to be used on hair. The dryer according to the present invention is not limited to a hair dryer, but also includes a dryer used for other purposes. The blower device according to the present invention is not limited to a dryer, but may also be applied to other devices such as an air conditioner equipped with a heater and a blower equipped with a heater.

[0009] As shown in Figs. 1 to 9, the blower 2 of the dryer 1 includes an impeller 10 having a plurality of blades 11 arranged in a rotation direction R, and a housing 30 that accommodates the impeller 10. The plurality of blades 11 extend in a radial direction of the impeller 10. The housing 30 includes an inlet 32 ​​for a fluid, an outlet 33 for a fluid, and a cover 20 that covers the inlet 32. The cover 20 includes a plurality of extensions 21 that are curved portions that extend in the rotation direction R of the impeller 10 along the outer edge of the inlet 32. An opening 22 is formed between two adjacent extensions 21 of the plurality of extensions. The pressure of the fluid between the plurality of extensions 21 and the impeller 10 is adjusted. The dryer 1 and the blower 2 will be specifically described below.

[0010] As shown in Figs. 1 and 8, the impeller 10 can rotate around the axis x. As shown in Fig. 8, for example, the fluid suction direction F1 and the fluid blowing direction F2 of the impeller 10 intersect. The impeller 10 extends long in the direction of the rotation axis (axis x direction). That is, the longitudinal direction of the impeller 10 is the axis x direction. As described above, the impeller 10 has a plurality of blades 11 extending in the radial direction, and the plurality of blades 11 extend long along the axis x, as shown in Figs. 1, 8, and 9. In the impeller 10, the plurality of blades 11 are arranged, for example, around the axis x. In this way, a space S extending in a substantially cylindrical shape is formed inside the plurality of blades 11, and the impeller 10 has a hollow shape. The shape of the blade 11 in a cross section perpendicular to the axis x is a curved shape (e.g., a circular arc shape) as shown in Fig. 8. Specifically, the blades 11 are arranged, for example, parallel or approximately parallel to the axis x, and arranged at a predetermined angle or at predetermined intervals around the axis x, and are arranged at equal or approximately equal angular intervals in the illustrated example. The impeller 10 is, for example, a crossflow fan.

[0011] As shown in Figs. 1 and 8, the housing 30 has a main body 31. As shown in Figs. 1 and 8, the main body 31 has an air passage 31a. The air passage 31a is a space in which the impeller 10 is accommodated, and is also a space through which a flow of fluid (airflow) F generated by the rotation of the impeller 10 passes. The main body 31 has two openings that open the air passage 31a. One of the two openings is an inlet 32, and the other is an outlet 33. Thus, the air passage 31a extends from the inlet 32 ​​to the outlet 33 in the rotation direction R of the impeller 10. The inlet 32 ​​of the fluid is an opening that allows gas as a fluid to be sucked into the impeller 10 from the outside of the housing 30. On the other hand, the outlet 33 is an opening that allows gas discharged by the impeller 10 to be blown out to the outside of the housing 30.

[0012] As shown in Figs. 1 and 8, the inlet 32 ​​is disposed outside the outer peripheral surface 10a (surface in the circumferential direction) of the impeller 10, and the inlet 32 ​​is formed to face the outer peripheral surface 10a of the impeller 10. In other words, the inlet 32 ​​is formed to face the ends 11a (inlet side) of the multiple blades 11 aligned in the rotation direction R. Here, the outer peripheral surface 10a of the impeller 10, in the illustrated example, is a surface formed by the ends 11a of the multiple blades 11 aligned in the rotation direction R, and has multiple openings due to the gaps between the multiple blades 11, and has a shape different from a continuous surface. The outer peripheral surface 10a of the impeller 10 may be a cylindrical virtual surface extending along the axis x tangent to the ends 11a of the multiple blades 11. The inlet 32 ​​is formed in the main body 31 so as to extend long along the axis x of the impeller 10, as shown in Fig. 1, and has a pair of ends 32a, 32b extending along the axis x, as shown in Fig. 8. The inlet 32 ​​is also formed in the main body 31 so as to extend long in the circumferential direction around the axis x. As shown in Fig. 8, the inlet 32 ​​has a pair of ends 32c, 32d extending in the rotational direction R.

[0013] As shown in Figs. 1 and 8, the area of ​​the inlet 32 ​​is larger than the area of ​​the outlet 33. The inlet 32 ​​is formed so that a large amount of gas is sucked into the impeller 10. The inlet 32 ​​is shaped so that, for example, 1 / 2 or 1 / 3 to 2 / 3 of the surface of the impeller 10 is exposed to the space outside the main body 31 in the circumferential direction. The inlet 32 ​​is shaped so that the entire outer peripheral surface of the impeller 10 or a part of the outer peripheral surface of the impeller 10 is exposed to the space outside the main body 31 in the axial x direction. Specifically, for example, as shown in Figs. 1 and 8, the inlet 32 ​​is opened so that the entire or a part of the outer peripheral surface 10a of the impeller 10 in the axial x direction and half or approximately half of the outer peripheral surface 10a of the impeller 10 in the circumferential direction are exposed to the space outside the main body 31. The size and shape of the inlet 32 ​​may be other sizes and shapes. In addition, the inlet 32 ​​may be covered with a filter to prevent foreign matter such as dust from entering the ventilation passage 31a.

[0014] As shown in Figs. 1 and 8, the outlet 33 is formed to face the outer peripheral surface 10a of the impeller 10 in a direction intersecting the radial direction of the impeller 10. The outlet 33 is formed in the main body 31 and extends long along the axis x of the impeller 10, as shown in Fig. 1, for example. The outlet 33 has a pair of ends 33a, 33b extending along the axis x, as shown in Figs. 1 and 8. The outlet 33 extends in the axis x direction, for example, the same or approximately the same as the impeller 10. The outlet 33 may extend in the axis x direction longer or shorter than the impeller 10 in the axis x direction. As shown in Fig. 8, the outlet 33 is formed to open a portion of the ventilation passage 31a on the opposite side of the inlet 32 ​​with respect to the impeller 10 in the radial direction of the impeller 10. The size and shape of the outlet 33 may be other sizes and shapes. The position of the outlet 33 relative to the inlet 32 ​​is not limited to the position shown in the figure and may be other positions. The outlet 33 may be covered with a filter, a lid having a honeycomb or multiple lattices, or the like. In the example shown in the figure, a lid 33c having a honeycomb extends over the outlet 33.

[0015] 1 and 8, for example, a nozzle 34 is formed in the main body 31. The nozzle 34 is formed in a portion of the ventilation passage 31a on the opposite side of the impeller 10 from the inlet 32 ​​in the radial direction of the impeller 10. The nozzle 34 extends along the rotation direction R of the impeller 10 and forms a flow path that moves away from the impeller 10 toward the outlet 33 (outside). The outlet 33 is formed at the tip (end) of the nozzle 34.

[0016] As shown in Figs. 1 and 8, the main body 31 has wall portions 35 and 36 which are portions forming the ventilation passage 31a in the radial direction. The wall portions 35 and 36 face the outer peripheral surface 10a of the impeller 10 and extend in the direction of the axis x. As shown in Fig. 8, the wall portion 35 is a portion of the main body 31 extending between an end 32a of the inlet 32 ​​and an end 33a of the outlet 33. The ends 32a and 33a are formed in the wall portion 35. Also, as shown in Fig. 8, the wall portion 36 is a portion of the main body 31 extending between an end 32b of the inlet 32 ​​and an end 33b of the outlet 33. The ends 32b and 33b are formed in the wall portion 36. The wall portion 35 has a shape (outer shape) recessed inwardly of the housing 30, and has a curved shape in cross section as shown in Fig. 8. As shown in FIG. 8, the wall portion 35 has a shape that is bent convexly toward the ventilation passage 31a. In this way, the portion of the main body 31 between the inlet 32 ​​and the outlet 33 has a bent shape. On the other hand, the cross section of the wall portion 36 is arc-shaped as shown in FIG. 8. The wall portion 36 extends in the circumferential direction of the impeller 10 so that the entire wall portion 36 faces the outer peripheral surface 10a of the impeller 10. As shown in FIG. 8, the wall portion 35 and the wall portion 36 face each other with the impeller 10 in between. The wall portion 35 may form a tongue of the ventilation passage 31a.

[0017] 1, 8 and 9, the main body 31 has wall portions 37 and 38 which form the ventilation passage 31a in the direction of the axis x. The wall portions 37 and 38 face each other in the direction of the axis x with the impeller 10 interposed therebetween, and the wall portions 35 and 36 are disposed between the wall portions 37 and 38. As shown in Fig. 8, the ends 32c and 32d of the inlet 32 ​​are formed in the wall portions 37 and 38, respectively, and the ends 32c and 32d face each other in the direction of the axis x.

[0018] The blower 2 has a heater 40 inside the main body 31. The heater 40 is disposed in the space S inside the impeller 10, as shown in FIG. 8, for example. The heater 40 extends along the axis x in the space S. The heater 40 is tubular (for example, cylindrical or substantially cylindrical) as shown in FIG. 8, for example, and the cross-sectional shape of the outer circumferential surface of the heater 240 is, for example, circular or substantially circular. The shape of the heater 40 is not limited to this shape. The illustrated shape of the heater 40 is a schematic representation of the shape of the space occupied by the components of the heater 40. The components of the heater 40 include, for example, a heating wire and a member supporting the heating wire. The heater 40 may be provided in another part of the main body 31. For example, the heater 40 may be provided in a part or all of the walls 35, 36, 37, and 38 of the main body 31. The heater 40 can be supplied with current by wiring electrically connected to a power source.

[0019] 10 and 11 are perspective views of the cover 20, each of which is a perspective view of the cover 20 seen from a different direction. As described above, the cover 20 is a member that covers the inlet 32 ​​and has a function of protecting the components of the blower device 2, such as the impeller 10. As shown in FIGS. 1 and 8, the cover 20 is curved so as to contact the main body 31 from the outside, for example, along the outer peripheral ends 25a and 26a of the cover support parts 25 and 26 that are members that support the cover 20, which will be described later. The cover 20 also has an area P1 facing the inlet 32, and this area P1 has a plurality of extension parts 21 and a plurality of openings 22. For example, the outer edge of the area P1 coincides or approximately coincides with the outer edge of the inlet 32, that is, the ends 32a, 32c, 32b, and 32d of the inlet 32, when viewed along the radial direction (see FIG. 8). The outer edge of the region P1 does not have to coincide with the outer edge of the inlet 32 ​​when viewed in the radial direction.

[0020] 8, the extension portion 21 extends along the edge 32c formed on the wall portion 37 or the edge 32d formed on the wall portion 38, which is the outer edge of the inlet 32, outside the inlet 32. As shown in FIG 8, the extension portion 21 extends across the inlet 32 ​​along the rotation direction R.

[0021] As described above, in the cover 20, the openings 22 are formed between two adjacent extension parts 21 among the multiple extension parts 21. That is, in the cover 20, the multiple extension parts 21 are arranged in the axis x direction at intervals. For example, the multiple extension parts 21 are arranged parallel to each other or approximately parallel to each other in the axis x direction. Note that the multiple extension parts 21 do not have to be arranged parallel to each other. Also, for example, the multiple extension parts 21 are arranged in the axis x direction at a predetermined interval, specifically at equal intervals or approximately equal intervals. In this case, the multiple openings 22 are also arranged in the axis x direction at equal intervals or approximately equal intervals.

[0022] Also, the width (width W1) of the extension portion 21 in the axis x direction (see FIG. 10) is, for example, uniform or approximately uniform in the rotation direction R. That is, the extension portion 21 is along a circular ring centered on the axis x. Also, the width (width W2) of the opening 22 in the axis x direction (see FIG. 10) is, for example, uniform or approximately uniform in the rotation direction R. The width of the extension portion 21 in the axis x direction may be uniform or approximately uniform in a direction inclined with respect to the rotation direction R. That is, the extension portion 21 may be along a spiral with the axis x as the central axis. In this case, the width of the opening 22 in the axis x direction is also uniform or approximately uniform in a direction inclined with respect to the rotation direction R. As described above, the extension portion 21 may extend linearly from one end to the other end when viewed in the radial direction, or may extend curvedly when viewed in the radial direction. For example, the extension portion 21 may extend in a serpentine manner along a circular ring centered on the axis x.

[0023] 8, the extension portion 21 is plate-shaped and has an inner peripheral surface 21a that faces the inner peripheral side and an outer peripheral surface 21b that faces the outer peripheral side. The inner peripheral surface 21a extends along the axis x, for example, parallel or substantially parallel to the axis x. The outer peripheral surface 21b extends parallel or substantially parallel to the inner peripheral surface 21a, and the thickness of the extension portion 21 is uniform or substantially uniform over the range of the extension portion 21 in the rotation direction R. The thickness of the extension portion 21 is the distance between the inner peripheral surface 21a and the outer peripheral surface 21b.

[0024] The width W1 of each extension 21 is smaller than the width W2 of each opening 22, for example. Moreover, the width W1 of the plurality of extensions 21 is smaller than the width W2 of the plurality of openings 22. That is, the sum of the widths W1 of all extensions 21 of the cover 20 is smaller than the sum of the widths W2 of all openings 22 of the cover 20. Moreover, the extension 21 is shaped to have a desired rigidity against a force from an airflow that flows into the ventilation passage 31a from the outside through the inlet 32, which is generated by the rotation of the impeller 10. Specifically, the width W1, thickness, and the like of the extension 21 are set so as to have such a desired rigidity.

[0025] As shown in Fig. 8, the inner circumferential surface 21a of the extension portion 21 is curved so as to face the space formed by the inlet 32 ​​from the outside. As shown in Fig. 8, the inner circumferential surface 21a of the extension portion 21 describes a circular arc or an approximately circular arc in cross section. As described above, the inner circumferential surface 21a extends parallel or approximately parallel to the axis x, and the outline of the inner circumferential surface 21a has the same or approximately the same shape over the entire width of the extension portion 21 in the axis x direction.

[0026] As shown in FIG. 8, a predetermined angle range between the end (end 21c) of the extension part 21 on the opposite side of the rotation direction R and the end (end 21d) of the extension part 21 on the rotation direction R side, centered on the axis x, is defined as a first angle range θ0. In addition, a predetermined angle range from the end 21c to a point at a certain distance in the rotation direction R in the first angle range θ0 is defined as a second angle range θ1, a predetermined angle range from the end 21d to a point at a certain distance in the opposite direction of the rotation direction R is defined as a fourth angle range θ3, and a predetermined angle range between the second angle range θ1 and the fourth angle range θ3 is defined as a third angle range θ2. As shown in FIG. 8, in a cross section perpendicular to the axis x, a distance D1 between the inner peripheral surface 21a of the extension part 21 and the outer peripheral surface 10a of the impeller 10 in the radial direction is larger in the second angle range θ1 than in the third angle range θ2. Moreover, the distance D1 in the fourth angle range θ3 is greater than the distance D1 in the third angle range θ2.

[0027] 8, for example, the distance D1 is constant or approximately constant in the third angle range θ2. In the second angle range θ1, the distance D1 increases toward the end 21c in the opposite direction to the rotation direction R, and is maximum at the end 21c. In the fourth angle range θ3, the distance D1 increases toward the end 21d in the rotation direction R, and is maximum at the end 21d.

[0028] As described above, the distance D1 between the ends 11a of the blades 11 of the impeller 10 and the extension portion 21 varies in the rotation direction R. As shown in Fig. 8, the distance D1a in the third angle range θ2, i.e., at the center (middle portion) of the inlet 32 ​​in the rotation direction R, may be smaller or larger than the distances D1b, D1c in the second or fourth angle range θ1 or θ3, i.e., at the ends of the inlet 32 ​​in the rotation direction R. Moreover, the distance D1 between the ends 11a of the blades 11 of the impeller 10 and the extension portion 21 may be the same or approximately the same in the first angle range θ0, i.e., across the rotation direction R.

[0029] 12 and 13 are partial exploded perspective views of the dryer 1. The cover 20 forms a part of the housing 30, and is adapted to be combined with the main body 31. For example, as shown in Figs. 8, 12 and 13, the main body 31 is formed with a recess 31b that spreads from the outer periphery side to cover the inlet 32, and the cover 20 is attached to the main body 31 by being accommodated in this recess 31b.

[0030] 12 and 13, in addition to the cover 20 and the main body 31, the housing 30 includes cover support parts 25 and 26 as side parts of the housing 30. The cover support parts 25 and 26 are members for supporting the cover 20 with respect to the main body 31 and for holding the cover 20 attached to the main body 31. The cover support parts 25 and 26 can be attached to, for example, ends 31c and 31d of the main body 31 in the direction of the axis x, respectively, and are attached to the ends 31c and 31d, respectively, to support the cover 20 accommodated in the recess 31b of the main body 31 with respect to the main body 31. The cover support part 26 is attached to an end 31d on the side of a handle 3 of the dryer 1 described later, and has a hole 26b through which the handle 3 passes.

[0031] Next, a description will be given of a specific example of the cover 20. As shown in Figures 10 and 11, the cover 20 is formed so as to cover the main body portion 31 from the inlet 32 ​​to the outlet 33, for example.

[0032] 10 and 11, the cover 20 has a frame-shaped frame portion 23 and a panel 24 that is a portion extending along the axis x within the frame portion 23. The frame portion 23 forms the outer edge of the cover 20. The panel 24 extends so as to divide the inside of the frame portion 23 into two regions, and extends along the axis x. One of the two regions is region P1, which corresponds to the inlet 32, and has a plurality of extension portions 21 and a plurality of openings 22 formed therein. The other of the two regions corresponds to the outlet 33, and has an opening 20a that is wider.

[0033] 10 and 11, the multiple extension portions 21 extend between the panel 24 and an upper frame portion 23a, which is a portion of the frame portion 23 facing the panel 24 on the side in the rotational direction R. The upper frame portion 23a extends along the axis x. Also, as shown in Figs. 10 and 11, an opening 20a extends between the panel 24 and a lower frame portion 23b, which is a portion of the frame portion 23 facing the panel 24 on the opposite side of the rotational direction R. The lower frame portion 23b extends along the axis x.

[0034] As shown in Figs. 10 and 11, in the frame 23, side frame portions 23c and 23d extend between both ends of the upper frame portion 23a and both ends of the lower frame portion 23b. The side frame portions 23c and 23d are connecting portions that connect the upper frame portion 23a and the lower frame portion 23b. The side frame portions 23c and 23d are portions of the frame 23 that extend between the upper frame portion 23a and the lower frame portion 23b, and extend along the rotation direction R. The side frame portions 23c and 23d are shaped along the main body portion 31, and are curved along the wall portion 36 of the main body portion 31 on the region P1 side (see Fig. 8). The panel 24 extends between the side frame portions 23c and 23d. The opening 20a extends between the side frame portions 23c and 23d in the direction of the axis x.

[0035] The shape and size of the opening 20a correspond to the shape and size of the space surrounded by the outlet 33, and the opening 20a covers the space inside the outlet 33. In other words, the ventilation passage 31a of the blower 2 communicates with the outside via the outlet 33 and the opening 20a of the cover 20. In addition, as shown in Fig. 8, the panel 24 is formed so as to cover the wall 35 of the main body 31 from the outside.

[0036] As shown in Fig. 8, the upper frame portion 23a contacts a portion of the wall portion 36 of the main body portion 31 that has a predetermined width from the end 32b of the inlet 32. Also, as shown in Fig. 8, the lower frame portion 23b contacts a portion of the wall portion 36 of the main body portion 31 that has a predetermined width from the end 33b of the outlet 33.

[0037] The cover 20 has the above-mentioned configuration, and the multiple extensions 21 cover the inlet 32, serving as a guard to prevent objects from entering the inlet 32 ​​from the outside. In addition, objects are prevented from entering the ventilation passage 31a from the outside through the inlet 32 ​​and damaging the components of the blower device 2, and the components of the blower device 2, such as the impeller 10, are protected.

[0038] 8, the extensions 21 extend along the rotation direction R of the impeller 10. Therefore, the distance D1 between the extensions 21 and the outer peripheral surface 10a of the impeller 10 is constant or changes smoothly in the rotation direction R of the impeller 10 within the first angle range θ0. Specifically, for example, in the first angle range θ0, the ratio (%) of the minimum value to the maximum value of the distance D1 is, for example, 80% or more, preferably 90% or more. As a result, the airflow generated by the rotation of the impeller 10 flows along the inner peripheral surface 21a of the extensions 21, and the occurrence of a predetermined pressure fluctuation or pressure pulsation in the airflow flowing between the extensions 21 and the outer peripheral surface 10a of the impeller 10 is suppressed. In this way, the pressure of the fluid between the multiple extensions 21 and the impeller 10 is adjusted, and the change in pressure generated in the fluid between the extensions 21 and the impeller 10 when the impeller 10 makes one rotation is constant or gradual. This gradual change in pressure is expressed, for example, as a ratio (%) of the minimum value to the maximum value of the pressure, and this ratio is, for example, 80% or more, preferably 90% or more. This prevents the multiple extensions 21 of the blower 2 from generating noise toward the surroundings.

[0039] As described above, according to the blower device 2 according to the embodiment of the present invention, it is possible to suppress the generation of noise.

[0040] Next, a modified example of the cover 20 will be described. FIG. 14 is a perspective view of a cover 20A according to a modified example of the cover 20, and FIG. 15 is a cross-sectional view showing a cross section perpendicular to the axis x of the blower 2 including the cover 20A according to the modified example. As shown in FIGS. 14 and 15, the cover 20A has an extension portion 27 that is another extension portion extending in the direction of the axis x of the impeller 10 along the inlet 32. The cover 20A has, for example, two extension portions 27. The two extension portions 27 are provided in the vicinity of the end 21c of the extension portion 21 and in the vicinity of the end 21d of the extension portion 21, respectively. Specifically, for example, the extension portion 27 is provided in a second angle range θ1 in the vicinity of the end 21c of the extension portion 21 and in a fourth angle range θ3 in the vicinity of the end 21d of the extension portion 21. The extension portion 27 can improve the rigidity of the multiple extension portions 21. In addition, the extension portion 27 extending along the axis x is provided in the region of the angle range θ1,3 where the distance D1 between the extension portion 21 and the circumferential surface 10a of the impeller 10 is large, so that the generation of noise due to the extension portion 27 is suppressed. In other words, the extension portion 27 suppresses the generation of pressure fluctuations or pressure pulsations in the airflow flowing along the outer circumferential surface 10a of the impeller 10. Note that the cover 20A may have the extension portion 27 in only one of the angle ranges θ1 and θ3. Also, the cover 20A may have a plurality of extension portions 27 in the angle range θ1, and may have a plurality of extension portions 27 in the angle range 2.

[0041] Next, the dryer 1 according to this embodiment will be described. As shown in Figs. 1 to 7, the dryer 1 has a blower 2 and a handle 3 attached to the blower 2. As shown in Figs. 9, 12, and 13, the handle 3 extends from an end 31d of the main body 31 along an axis x. The dryer 1 also has a motor 4, which is housed inside the handle 3. The motor 4 is connected to the impeller 10 so as to rotate the impeller 10. As a result, when the motor 4 rotates, the impeller 10 rotates.

[0042] The dryer 2 also includes wiring 5 that electrically connects the motor 4 to an external device such as an external power source. As shown in Fig. 8, the wiring 5 is housed in a recess 35a that is a bent portion of a wall 35 of the main body 31. The recess 35a extends along the axis x. As described above, the wall 35 is covered by the panel 24 of the cover 20. Therefore, the wiring 5 housed in the recess 35a of the wall 35 is covered by the panel 24, and the area exposed to the outside is reduced.

[0043] According to the dryer 1 according to the embodiment of the present invention, similarly to the blower device 2, the generation of noise can be suppressed.

[0044] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the claims that such modifications or improvements can also be included in the technical scope of the present invention.

[0045] The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. Moreover, the above-described embodiments do not limit the use of the present invention, and the present invention may include anything as its use. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those exemplified, and can be changed as appropriate. For example, the present invention includes differences that occur in the implementation of manufacturing tolerances, etc. Furthermore, the components shown in different embodiments can be partially replaced or combined with each other within a range that is not technically contradictory. Furthermore, each configuration can be appropriately and selectively combined so as to achieve at least a part of the above-described problems and effects. [Explanation of symbols]

[0046] 1 Dryer, 2 Blower, 3 Handle, 4 Motor, 10 Impeller, 10a Peripheral surface, 11 Blade, 11a End, 12, 13 End wall part, 12a, 13a Opening, 12b, 13b Support part, 12c, 13c Inner peripheral surface, 12d, 13d Outer peripheral surface, 20, 20A Cover, 20a Opening, 21 Extension part, 21a Inner peripheral surface, 21b Outer peripheral surface, 21c, 21d End, 22 Opening, 23 Frame part, 23a Upper frame part, 23b Lower frame part, 23c, 23d Side frame part, 24, 27 Extension part, 25, 26 Cover support part, 25a, 26a, Outer peripheral end, 26b Hole, 30 Housing, 31 Main body part, 31a Ventilation path, 31b Recess, 31c, 31d End, 32 Inlet, 32a, 32b, 32c, 32d End, 33 Outlet, 33a, 33b End, 33c Cover, 34 Nozzle, 35, 36, 37, 38 Wall part, 35a Recess, 40 Heater, D1, D1a, D1b, D1c Distance, F Airflow, F1 Suction direction, F2 Blowing direction, P1 Region, R Rotation direction, S Space, W1, W2 Width, x Axis line 1, θ0, θ1, θ2, θ3 Angle range

Claims

1. An impeller having multiple blades arranged in the direction of rotation, A housing for the impeller, Equipped with, The plurality of blades extend in the radial direction of the impeller, The housing comprises a fluid inlet, a fluid outlet, and a cover that covers the inlet. The cover comprises a plurality of extended portions, which are curved portions that extend in the direction of rotation of the impeller. Of the plurality of extensions, an opening is formed between two adjacent extensions. The fluid pressure between the plurality of extensions and the impeller is regulated. Blower.

2. In the axial direction of the impeller, the width of the extended portion is smaller than the width of the opening. The blower according to claim 1.

3. In the axial direction of the impeller, the width of the plurality of extensions is smaller than the width of the plurality of openings. The blower according to claim 1.

4. The cover comprises one or more other extending portions that extend in the axial direction of the impeller. A blower according to any one of claims 1 to 3.

5. The housing is equipped with a fluid ventilation passage, The fluid passage extends from the inlet to the outlet in the direction of rotation of the impeller. A blower according to any one of claims 1 to 3.

6. The device comprises a motor and wiring that electrically connects the motor to an external device, The portion of the housing between the inlet and the outlet has a curved shape, The aforementioned wiring is housed in the portion of the housing. A blower according to any one of claims 1 to 3.

7. A blower according to any one of claims 1 to 3, and a handle, Hair dryer.

8. The motor is housed inside the handle. The hair dryer according to claim 7.

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