Air supply device and dust collector
阅读说明:本技术 送风装置和吸尘器 (Air supply device and dust collector ) 是由 山内亮二 于 2020-02-20 设计创作,主要内容包括:本发明提供送风装置和吸尘器,送风装置具有:转子,其具有沿上下延伸的中心轴线配置的轴;定子,其与所述转子在径向上对置;叶轮,其固定于所述轴,能够绕所述中心轴线旋转;以及壳体,其配置于比所述叶轮靠下方的位置。所述壳体具有:环状的内环状部,其与所述定子相固定;环状的外环状部,其配置于比所述内环状部靠径向外侧的位置,在该外环状部与所述内环状部的径向之间构成第1流路;以及第1肋,其连接所述内环状部与所述外环状部。所述定子在所述叶轮与所述内环状部的轴向之间处与所述第1肋的上部空间连通,所述第1肋的径向外端的周向长度与所述第1肋的径向内端的周向长度不同。(The invention provides a blower and a dust collector, the blower includes: a rotor having a shaft disposed along a central axis extending vertically; a stator that is radially opposed to the rotor; an impeller fixed to the shaft and rotatable about the central axis; and a casing disposed below the impeller. The housing has: an annular inner annular portion fixed to the stator; an annular outer annular portion disposed radially outward of the inner annular portion, and forming a 1 st flow path between the outer annular portion and the inner annular portion in a radial direction; and a 1 st rib connecting the inner annular portion and the outer annular portion. The stator communicates with an upper space of the 1 st rib at a position between the impeller and the inner annular portion in an axial direction, and a circumferential length of a radially outer end of the 1 st rib is different from a circumferential length of a radially inner end of the 1 st rib.)
1. An air supply device includes:
a rotor having a shaft disposed along a central axis extending vertically;
a stator that is radially opposed to the rotor;
an impeller fixed to the shaft and rotatable about the central axis; and
a casing disposed below the impeller,
the housing has:
an annular inner annular portion fixed to the stator;
an annular outer annular portion disposed radially outward of the inner annular portion, and forming a 1 st flow path between the outer annular portion and the inner annular portion in a radial direction; and
a 1 st rib connecting the inner annular portion and the outer annular portion,
it is characterized in that the preparation method is characterized in that,
the stator communicates with an upper space of the 1 st rib at a position between the impeller and the inner annular portion in an axial direction,
a circumferential length of a radially outer end of the 1 st rib is different from a circumferential length of a radially inner end of the 1 st rib.
2. The air supply arrangement according to claim 1,
the stator has:
a stator core having an annular core back and a plurality of teeth extending radially inward from the core back and arranged in a circumferential direction;
an insulator covering at least a portion of an upper surface of the tooth; and
a coil formed by winding a wire around the teeth with the insulator interposed therebetween,
the 1 st rib is disposed radially outward of the teeth.
3. The air supply arrangement of claim 2,
a circumferential length of a radially inner end of the 1 st rib is longer than a circumferential length of the tooth.
4. The air supply apparatus according to claim 2 or 3,
the housing further has a plurality of 2 nd ribs arranged in a circumferential direction, the plurality of 2 nd ribs extending from the inner annular portion in a direction close to the central axis,
the 2 nd rib is disposed between the plurality of coils in the circumferential direction.
5. The air supply apparatus according to any one of claims 1 to 4,
the inner annular portion, the outer annular portion, and the 1 st rib are formed of the same material by integral molding.
6. The air supply apparatus according to any one of claims 1 to 5,
a circumferential length of a radially outer end of the 1 st rib is shorter than a circumferential length of a radially inner end of the 1 st rib.
7. The air supply arrangement of claim 6,
the surface of the 1 st rib located on the rear side in the rotation direction of the impeller is arranged on the front side in the rotation direction as being closer to the radially outer side.
8. The air supply apparatus according to any one of claims 1 to 5,
a circumferential length of a radially inner end of the 1 st rib is shorter than a circumferential length of a radially outer end of the 1 st rib.
9. The air supply arrangement of claim 8,
the surface of the 1 st rib located on the rear side in the rotation direction of the impeller extends forward in the rotation direction as it approaches the radially inner side, and is a curved surface that protrudes rearward in the rotation direction.
10. The air supply apparatus according to any one of claims 1 to 9,
the blower device further includes a diffuser disposed below the impeller and above the inner annular portion,
the diffuser has:
a base portion that extends in a direction intersecting the center axis; and
and a plurality of 1 st stationary blades arranged in a circumferential direction on a lower surface of the base portion and extending forward in the rotational direction as approaching the center axis.
11. The air supply arrangement of claim 10,
the diffuser further includes a plurality of 2 nd stationary blades arranged in a circumferential direction at a position radially outward of a radially outer edge of the base portion and extending downward toward a front side in the rotation direction,
the 2 nd stationary blade is disposed above the 1 st flow path.
12. A dust collector is characterized in that a dust collector is provided,
the dust collector is provided with the air supply device of any one of claims 1 to 11.
Technical Field
The invention relates to a blowing device and a dust collector.
Background
An example of a conventional air blowing device is disclosed in japanese laid-open patent publication No. 2018-084151. The electric blower described in japanese laid-open patent publication No. 2018-084151 includes a centrifugal fan, a motor, and a rectifier. The motor has a rotor, a stator, and a frame. The rectifier has: an outer contour portion which constitutes an outer contour and supports the frame; a main body portion disposed inside the outer frame portion; and an air passage portion formed between the outer frame portion and the main body portion. The inner diameter of the air passage is larger than the outer diameter of at least a part of the stator core, and the outer diameter of the air passage is smaller than or equal to the inner diameter of the frame. Further, the frame has a restricting portion. The restricting portion positions the frame in a circumferential direction with respect to the stator by preventing the stator core from rotating.
Further, the above configuration can secure the air passage from the air passage portion to the exhaust air while suppressing an increase in size, and can improve the air blowing efficiency of the electric blower.
However, in the electric blower disclosed in japanese laid-open patent publication No. 2018-084151, it is difficult to cool the stator while suppressing a decrease in the blowing efficiency.
Disclosure of Invention
In view of the above circumstances, an object of the present invention is to provide an air blower capable of cooling a stator while suppressing a decrease in air blowing efficiency.
An exemplary embodiment of the present invention is an air blowing device including: a rotor having a shaft disposed along a central axis extending vertically; a stator that is radially opposed to the rotor; an impeller fixed to the shaft and rotatable about the central axis; and a casing disposed below the impeller. The housing has: an annular inner annular portion fixed to the stator; an annular outer annular portion disposed radially outward of the inner annular portion, and forming a 1 st flow path between the outer annular portion and the inner annular portion in a radial direction; and a 1 st rib connecting the inner annular portion and the outer annular portion. The stator communicates with an upper space of the 1 st rib at a position between the impeller and the inner annular portion in an axial direction, and a circumferential length of a radially outer end of the 1 st rib is different from a circumferential length of a radially inner end of the 1 st rib.
The vacuum cleaner according to the exemplary embodiment of the present invention includes the blower described above.
According to the air blowing device of the exemplary embodiment of the present invention, the stator can be cooled while suppressing a decrease in air blowing efficiency. In addition, according to the vacuum cleaner of the exemplary embodiment of the present invention, the stator can be cooled while suppressing a decrease in air blowing efficiency in the air blowing device included in the vacuum cleaner.
The above and other features, elements, steps, features and advantages of the present invention will be more clearly understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings.
Drawings
Fig. 1 is a perspective view of a vacuum cleaner according to an exemplary embodiment of the present invention.
Fig. 2 is a perspective view of an air blowing device according to an exemplary embodiment of the present invention.
Fig. 3 is a longitudinal sectional view of the blower according to the exemplary embodiment of the present invention.
Fig. 4 is a perspective view of a diffuser according to an exemplary embodiment of the present invention as viewed from above.
Fig. 5 is a perspective view of a diffuser according to an exemplary embodiment of the present invention as viewed from below.
Fig. 6 is a perspective view showing a housing and its periphery of an exemplary embodiment of the present invention.
Fig. 7 is a plan view showing a housing and its periphery of an exemplary embodiment of the present invention.
Fig. 8 is a cross-sectional view of a relaxed housing and its periphery of an exemplary embodiment of the present invention.
Fig. 9 is a plan view showing a housing and its periphery of an exemplary modification of the present invention.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present specification, the direction in which the central axis J of the air blowing device 100 extends is referred to as the "vertical direction" or the "axial direction", the direction perpendicular to the central axis J of the air blowing device 100 is referred to as the "radial direction", and the direction along an arc centered on the central axis J of the air blowing device 100 is referred to as the "circumferential direction". However, the "vertical direction" described above is not limited to the direction of the blower 100 when actually assembled in the apparatus. In the drawings, for convenience of understanding, the description contents of the drawings may be different from the actual structure.
In the present specification, the shape and positional relationship of each part will be described with reference to the direction toward the floor surface F as "downward" and the direction away from the floor surface F as "upward" in the vacuum cleaner a. These directions are names used for explanation only, and do not limit the actual positional relationship and directions. "upstream" and "downstream" respectively indicate upstream and downstream in the flow direction of the gas sucked from the air suction unit 103 when the blower 100 is driven.
A vacuum cleaner a according to an exemplary embodiment of the present invention will be described. Fig. 1 is a perspective view of a vacuum cleaner a according to an exemplary embodiment of the present invention. The vacuum cleaner a is a so-called stick type electric vacuum cleaner, and includes a housing 102 having an air suction unit 103 and an air discharge unit 104 formed on a lower surface and an upper surface, respectively. A power supply line (not shown) is led out from the back of the housing 102. The power cord is connected to a power outlet (not shown) provided on a side wall surface of the room, and supplies electric power to the cleaner a. The vacuum cleaner a may be a so-called robot type, canister type, or portable type electric vacuum cleaner.
An air passage (not shown) connecting the air intake unit 103 and the air discharge unit 104 is formed in the housing 102. A dust collecting unit (not shown), a filter (not shown), and an air blower 100 are arranged in this order from the upstream side toward the downstream side in the air passage. The blower 100 includes an impeller 30 described later. Dust such as dust contained in the gas flowing through the gas passage is filtered by the filter and collected in the dust collecting unit formed in a container shape. The dust collecting unit and the filter are configured to be detachable from the housing 102.
A grip 105 and an operation unit 106 are provided on the upper portion of the housing 102. The user can move the vacuum cleaner a by gripping the grip portion 105. The operation unit 106 includes a plurality of buttons 106a, and the operation setting of the cleaner a is performed by operating the buttons 106 a. For example, the start of driving, the stop of driving, and the change of the rotation speed of blower 100 are instructed by the operation of button 106 a. The downstream end (upper end in the figure) of the rod-like suction pipe 107 is connected to the suction unit 103. The suction nozzle 108 is detachably attached to the upstream end of the suction pipe 107. Debris on the floor surface F is sucked into the suction pipe 107 through the suction nozzle 108.
The vacuum cleaner a includes a blower 100 described later. Thus, in the vacuum cleaner a, the
Fig. 2 is a perspective view of air blower 100. Fig. 3 is a longitudinal sectional view of the blower device 100. Referring to fig. 2 and 3, the blower 100 includes a motor 1 and an impeller 30 rotationally driven by the motor 1. More specifically, the blower 100 includes a rotor 10, a
The motor 1 has a rotor 10 and a
Referring to fig. 3, 7, and 8,
The
The impeller 30 is fixed to the shaft 11. The impeller 30 has a main plate 31, a plurality of moving blades 32, and a shroud 33. The main plate 31 is a portion extending in a direction substantially perpendicular to the center axis J. The plurality of rotor blades 32 extend upward from the upper surface of the main plate 31 and are arranged at substantially equal intervals in the circumferential direction. The shroud 33 is disposed above the main plate 31, and the upper ends of the plurality of moving blades 32 are connected to the shroud 33.
The impeller 30 is fixed to an upper end portion of the shaft 11 by an annular boss 34. Thereby, the impeller 30 is fixed to the shaft 11 and is rotatable about the center axis J. The impeller may be a so-called diagonal flow impeller. That is, the main plate 31 may be a curved surface extending downward as it approaches the radially outer side. Further, the impeller may not have a shroud. The impeller 30 and the shaft 11 may be fixed by other means.
The shroud 33 has an opening 37 at the center that opens axially. Thus, when the motor 1 rotates and the impeller 30 rotates, the gas above the shroud 33 is drawn downward through the opening 37, flows radially outward through the moving blades 32, and is discharged radially outward of the impeller 30.
The impeller 30 is surrounded by an impeller shroud 70. That is, the impeller shroud 70 surrounds the radially outer side and above the impeller 30. An air inlet 71 is formed at the center of the impeller cover 70. The suction port 71 communicates with the opening 37. That is, the gas disposed near the inlet port 71 is sucked into the impeller cover 70 by the rotation of the impeller 30, and is sucked into the impeller 30 through the opening 37.
The diffuser 40 is disposed below the impeller 30 and above the inner annular portion 51. The inner ring portion 51 will be described later. The diffuser 40 has a base portion 41 and a plurality of 1 st stationary vanes 42. The base portion 41 expands in a direction intersecting the center axis J. That is, the base portion 41 may be extended in a direction substantially perpendicular to the central axis J, and for example, the base portion 41 may have an inclined surface or a curved surface that is extended upward as it is separated from the central axis J. The plurality of 1 st stationary blades 42 are arranged in the circumferential direction on the lower surface of the base portion 41. In the present embodiment, the diffuser 40 further has the 2 nd stationary vanes 43 and the outer cylindrical portion 44. The outer tube portion 44 is a tubular portion extending in the axial direction at a position radially outward of the radially outer edge 411 of the base portion 41. The radially outer edge 411 of the base portion 41 and the outer cylindrical portion 44 are connected by the 2 nd stationary vane 43. The details of the diffuser 40 will be described later.
The
The
The outer
The
The 2
The inner annular portion 51, the outer
A lower case 58 is disposed below the
Next, the diffuser 40 will be described with reference to fig. 4 and 5. Fig. 4 is a perspective view of the diffuser 40 according to the exemplary embodiment of the present invention as viewed from above. Fig. 5 is a perspective view of the diffuser 40 according to the exemplary embodiment of the present invention as viewed from below.
The diffuser 40 has a base portion 41 and a plurality of 1 st stationary vanes 42. The base portion 41 expands from a direction intersecting the center axis J. In the present embodiment, the base portion 41 is expanded in a direction substantially perpendicular to the center axis J. The plurality of 1 st stationary blades 42 are arranged in the circumferential direction on the lower surface of the base portion 41. The plurality of 1 st stationary vanes 42 extend forward in the rotational direction R as they approach the center axis J. This forms the 2 nd flow path C2 that connects the radially outer side and the radially inner side of the inner annular portion 51. Thus, since a part of the gas flowing radially outward of the radially outer end 421 of the 1 st stationary vane 42 is smoothly guided in the direction closer to the central axis J by the 2 nd flow passage C2, the gas is blown to the
The diffuser 40 also has a plurality of 2 nd stationary blades 43 and an outer cylindrical portion 44. The plurality of 2 nd stationary blades 43 extend radially outward from the radially outer edge 411 of the base portion 41. The outer tube portion 44 is a tubular portion connected to the radially outer ends 433 of the plurality of 2 nd stationary blades 43 and extending in the axial direction. The outer cylindrical portion 44 is substantially coaxial with the outer
The diffuser 40 includes a plurality of 2 nd stationary blades 43 arranged in the circumferential direction at a position radially outward of the radially outer edge 411 of the base portion 41. The 2 nd stationary blade 43 extends downward toward the front in the rotation direction R. The 2 nd stationary blade 43 is disposed above the 1 st flow path C1. This allows the gas flowing radially outward of the base portion 41 to be smoothly guided downward. This improves the air blowing efficiency of the air blowing device 100. Further, the blowing efficiency of the gas flowing through the 1 st flow path C1 is improved. The 2 nd stationary blade 43 extends downward toward the front in the rotation direction R of the impeller 30. A flow path defined by the plurality of 2 nd stationary blades 43 in the circumferential direction is formed in a space radially outward of the radially outer edge 411 of the base portion 41.
Further, the
Preferably, at least a part of the 1 st stationary vane 42 and the inner annular portion 51 face each other with a gap therebetween in the axial direction. Accordingly, as compared with the case where the lower ends of the 1 st stationary blades 42 contact the upper surface of the inner annular portion 51, the gas smoothly flows in the 2 nd flow passage C2, and therefore, the cooling characteristics of the motor 1 are improved.
More specifically, the axial gap between the lower end of the 1 st stationary blade 42 and the upper surface of the inner annular portion 51 is preferably longer than half the axial length of the radially outer end 421 of the 1 st stationary blade 42. This makes it possible to increase the axial length of the 1 st stationary blade 42, increase the axial gap between the lower end of the 1 st stationary blade 42 and the upper surface of the inner ring-shaped portion 51, and improve the air blowing efficiency in the 2 nd flow path C2. This enables the motor 1 to be efficiently cooled.
The lower end 432 of the radially inner end 431 of the 2 nd stationary blade 43 is preferably arranged above the lower end 422 of the radially outer end 421 of the 1 st stationary blade 42. This allows the gas guided by the 2 nd stationary blade 43 to be guided more smoothly to the 2 nd flow path C2, and thus the motor 1 can be cooled efficiently.
In more detail, the axial length of the 2 nd stationary vane 43 at the radially inner end 431 of the 2 nd stationary vane 43 is preferably approximately half of the axial length of the radially outer end 421 of the 1 st stationary vane 42. This allows the gas guided by the 2 nd stationary blade 43 to be guided more smoothly to the 2 nd flow path C2.
The lower end 434 of the radially outer end 433 of the 2 nd stationary blade 43 is preferably disposed below the lower end 422 of the radially outer end 421 of the 1 st stationary blade 42. This makes it possible to increase the axial length of the 2 nd stationary vane 43 in the vicinity of the radially outer end 433 of the 2 nd stationary vane 43. This allows the gas flowing in the vicinity of the radially outer end 433 of the 2 nd stationary blade 43, of the gas flowing radially outward of the base portion 41, to be smoothly guided downward. This improves the air blowing efficiency of the air blowing device 100. Further, the blowing efficiency of the gas flowing through the 1 st flow path C1 is also improved.
The 1 st stationary vanes 42 are preferably arranged at equal intervals in the circumferential direction. Thus, the 2 nd flow passage C2 can be formed at equal intervals in the circumferential direction. This makes it possible to make the airflow flowing through the 2 nd flow path C2 nearly uniform in the circumferential direction, and to cool the motor 1 as uniformly as possible in the circumferential direction.
The 2 nd stationary vanes 43 are preferably arranged at equal intervals in the circumferential direction. As a result, the airflow guided downward by the 2 nd stationary blade 43 is made nearly uniform in the circumferential direction, and therefore, turbulence is suppressed from occurring in the flow path formed between the 2 nd stationary blade 43 in the circumferential direction, and the air blowing efficiency of the air blowing device 100 is improved.
Preferably, the number of the 1 st stationary blades 42 is equal to the number of the 2 nd stationary blades 43. Further, the circumferential position of the radially outer end 421 of each 1 st stationary blade 42 is preferably substantially the same as the circumferential position of the lower end of each 2 nd stationary blade 43. Accordingly, since the gas guided downward by the 2 nd stationary blades 43 is smoothly guided to the 2 nd flow path C2 by the 1 st stationary blade 42, the air blowing efficiency can be improved and the motor 1 can be cooled efficiently.
Next, the structure of the
Preferably, the
The 2
The circumferential length L1 of the radially outer end of the 1
The 1
The circumferential length L2 of the radially inner end of the 1
In the present embodiment, the circumferential length L1 of the radially outer end of the 1
A
A
The
The circumferential length of the 1
Fig. 9 is a plan view showing a housing 50A and its periphery according to an exemplary modification of the present invention. In the description of the modified examples, only the characteristic portions different from the above-described exemplary embodiments are described. The same reference numerals are given to the same components in the exemplary embodiment and the modified examples, and the description thereof may be omitted.
The circumferential length L2A of the radially inner end of the 1 st rib 53A is shorter than the circumferential length L1A of the radially outer end of the 1 st rib 53A. Accordingly, by enlarging the upper surface 531A of the 1 st rib 53A in the radially outer region where the flow rate is relatively high, more gas can be guided to the
The rear side surface 532A of the 1 st rib 53A in the rotation direction R of the impeller 30 extends forward in the rotation direction R as approaching radially inward, and is a curved surface projecting rearward in the rotation direction R. That is, the radially inner end of the rotation direction R rear side surface 532A is disposed forward in the rotation direction R than the radially outer end of the rotation direction R rear side surface 532A. Accordingly, for example, compared to a case where the rear side surface 532A extends from the radially inner end to the radially outer end in the substantially radial direction in the rotation direction R, the flow path cross-sectional area of the 1 st rib 53A is increased, and therefore, more air flow can be guided to the
The radially outer end of the rear side surface 532A in the rotational direction R is disposed rearward in the rotational direction R than the rear side surface in the rotational direction R of the
Various modifications and combinations can be added to the various technical features disclosed in the present specification without departing from the scope of the technical idea of the present invention.
The present invention can be used in, for example, a blower device and a vacuum cleaner.
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