JP2020041480A - Air blower and air distribution device using the same - Google Patents

Abstract

To provide a blower and an air distribution device capable of increasing an air distribution amount while reducing generation of noise at an upstream-side end portion in a circumferential direction, of a first air channel and a second air channel.SOLUTION: A housing 5 of a blower has a first intake port 51 positioned at an axial one side with respect to a first impeller 3, a second intake port 52 positioned at the axial other side with respect to a second impeller 4, a single blowing port positioned at a radial outer side of a shaft 2a with respect to the first impeller and the second impeller, a first air channel 54 communicated with the first intake port and the blowing port, a second air channel 55 communicated with the second intake port and the blowing port, and a wall portion 56 axially partitioning the first air channel and the second air channel. The first air channel and the second air channel respectively have a first opening portion and a second opening portion at a most upstream side in each air flowing direction in the circumferential direction. An axial thickness of the wall portion is gradually reduced from a start end of the wall portion positioned at an upstream side in the air flowing direction in the circumferential direction toward a terminal end of the wall portion positioned at a downstream side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a blower and a blower using the same.

  Conventionally, a centrifugal blower having two impellers has been proposed. For example, in a blower disclosed in Patent Document 1, a first impeller and a second impeller are connected to both ends of a rotating shaft of a motor, respectively. When the first impeller and the second impeller are rotated, air is taken into the housing from both ends in the axial direction. The air travels circumferentially within the housing.

  A wind tunnel (hereinafter, also referred to as a first wind tunnel) that forms a flow path of air that travels inside the housing by rotation of the first impeller is provided inside the housing. Further, a wind tunnel (hereinafter, also referred to as a second wind tunnel) that forms a flow path of air that travels inside the apparatus by rotation of the second impeller is provided inside the housing. The first wind tunnel and the second wind tunnel are completely separated from each other, and each air flowing through the first wind tunnel and the second wind tunnel is discharged from a separate air outlet.

International Publication No. WO2006-170881A

  In a centrifugal blower having a first wind tunnel and a second wind tunnel, as a method of increasing the amount of blown air, for example, a method of shielding the upstream end of the first wind tunnel and the second wind tunnel in the circumferential direction of air flow. There is. It is considered that by shielding the end portion, the sucked air can be efficiently guided to the air blowing port to increase the blowing air volume. However, when the end is shielded, a large negative pressure is generated between the end and the impeller, and a noise is generated due to the negative pressure. Therefore, from the viewpoint of reducing the generation of noise, it is desirable to open the end.

  However, when the end is opened, an opening is formed at the end, so that the upstream side of the first wind tunnel is located between the downstream side of the first wind tunnel and the outside of the first wind tunnel through the opening. Is connected. In this case, there is a possibility that the air flowing from the upstream side to the downstream side in the first wind tunnel in the circumferential direction returns to the first wind tunnel again through the opening. When such rewinding occurs, the amount of air flowing from the downstream side of the first wind tunnel to the air outlet decreases, and the amount of air discharged from the air outlet (blowing air amount) decreases. When the end of the second wind tunnel is opened, there is a possibility that the amount of blown air may be reduced for the same reason as described above.

  In view of the above, the present invention provides a configuration in which air sucked in from the axial direction by two impellers is caused to advance in the circumferential direction inside the first wind tunnel and the second wind tunnel and discharged from the air outlet. It is an object of the present invention to provide a blower capable of increasing the amount of blown air while reducing the generation of noise at a circumferentially upstream end of a second wind tunnel, and a blower using the blower.

  An exemplary blower of the present invention includes a motor having a shaft that rotates about a central axis, first and second impellers connected to both ends of the shaft in the axial direction, the motor, the first impeller, And a housing accommodating the second impeller therein, wherein the housing has a first intake port located on one side in the axial direction from the first impeller, and another axial side on the other side in the axial direction from the second impeller. , A single air outlet located radially outward of the shaft from the first impeller and the second impeller, and a circumferential direction of the shaft communicating with the first air inlet. A first wind tunnel in which the most downstream side in the circumferential direction of air flow in the circumferential direction communicates with the air inlet; and a second air inlet which extends in the circumferential direction of the shaft. A second wind tunnel in which the most downstream side of the air flow direction in the direction is in communication with the blower port, and a wall extending in the circumferential direction and axially separating the first wind tunnel and the second wind tunnel, The first wind tunnel and the second wind tunnel each have a first opening and a second opening at the most upstream side in the circumferential direction of each air flow direction, and the axial thickness of the wall is in the circumferential direction. It becomes thinner from the starting end of the wall located on the upstream side in the flow direction of the air toward the end of the wall located on the downstream side.

  The thickness of the wall part separating the first wind tunnel and the second wind tunnel in the axial direction becomes thinner from the beginning to the end in the circumferential direction. Accordingly, even if the first opening and the second opening are provided on the most upstream side in the circumferential direction of the first wind tunnel and the second wind tunnel, respectively, in order to reduce noise and noise caused by the negative pressure, the first wind tunnel is provided. Further, it is possible to reduce that each air flowing in the circumferential direction inside the second wind tunnel returns to the first wind tunnel and the second wind tunnel via the first opening and the second opening. Therefore, while reducing the generation of noise due to negative pressure at the upstream end of the first wind tunnel and the second wind tunnel, each air is efficiently guided from the downstream side of the first wind tunnel and the second wind tunnel to the air outlet, The blowing air volume can be increased.

FIG. 1 is a perspective view of a blower according to an embodiment of the present invention. FIG. 2 is a side view of the blower. FIG. 3 is a perspective view of the blower viewed from a different angle from FIG. FIG. 4 is a front view of the blower. FIG. 5 is an exploded perspective view of the blower. FIG. 6 is a longitudinal sectional view of the blower cut along the line AA of FIG. 3 in the axial direction. FIG. 7 is a longitudinal sectional view of the blower cut in the axial direction along line BB in FIG. 3. FIG. 8 is a perspective view of the blower in a state where the illustration of the first upper case is omitted. FIG. 9 is a perspective view of the blower in a state where the illustration of the first upper case, the first lower case, and the second upper case is omitted. FIG. 10 is a plan view of the blower in a state where the illustration of the first upper case is omitted. FIG. 11 is a perspective view of the blower. FIG. 12 is a perspective view of the blower in a state where illustration of a housing and an internal blower is omitted. FIG. 13 is an exploded perspective view of the blower in a state where the illustration of the housing is omitted. FIG. 14 is a partial perspective view of the blowing device at the time of blowing. FIG. 15 is a side view of the blower when the inside of the housing in a state before the blower is rotated is viewed from the second intake port side. FIG. 16 is a side view of the blower when the inside of the housing in a state after the blower is rotated is viewed from the second intake port side.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this document, the axis that is the rotation center of the shaft of the motor is referred to as a “center axis”, and the direction in which the center axis extends is simply referred to as an “axial direction”. Further, a direction orthogonal to the center axis with the center axis as a starting point is simply referred to as a “radial direction”, and a direction along an arc drawn about the center axis is simply referred to as a “circumferential direction”.

  In this document, for convenience of explanation, the axial direction is defined as the up-down direction, and the up-down direction of the blower is associated with the up-down direction in the axial direction, and the shape and positional relationship of each part will be described. At this time, one in the axial direction is “up” and the other in the axial direction is “down”. Further, one side in the axial direction is referred to as “upper side”, and the other side in the axial direction is referred to as “lower side”. According to this definition, for example, the “upper side” in the axial direction is the “first intake port side” of the blower, and the “lower side” is the “second intake port side”. Note that the definition of the vertical direction does not limit the orientation and the positional relationship when the blower and the blower are used.

  In this document, a section parallel to the axial direction is referred to as a “longitudinal section”. It should be noted that the term “parallel” used in this document does not represent parallel in a strict sense, but includes substantially parallel.

<1. Blower>
(1-1. Schematic Configuration of Blower)
FIG. 1 is a perspective view of a blower 1 according to an exemplary embodiment of the present invention, and FIG. 2 is a side view of the blower 1. FIG. 3 is a perspective view of the blower 1 viewed from a different angle from FIG. 1, and FIG. 4 is a front view of the blower 1. FIG. 5 is an exploded perspective view of the blower 1. Here, the direction in which the blower 1 is viewed from the direction opposite to the direction in which air is discharged from the blower port 53 of the blower 1 is referred to as “front”. The blower 1 is a centrifugal blower having a motor 2, a first impeller 3 and a second impeller 4, and a housing 5.

  The motor 2 has a shaft 2a that rotates about a central axis C. The shaft 2a is a columnar member made of, for example, a metal such as stainless steel and extending vertically in the axial direction. The motor 2 has a bearing, a stator, and a rotor in addition to the shaft 2a. The bearing rotatably supports the shaft 2a around the central axis C. The stator and the rotor rotate the shaft 2a by a change in magnetic flux due to the supply of the drive current. In addition, the motor 2 can be configured by a general motor, and is not particularly limited.

  The first impeller 3 is connected to one end (upper side) of the shaft 2a in the axial direction. The second impeller 4 is connected to the other end (lower side) of the shaft 2a in the axial direction. The first impeller 3 and the second impeller 4 rotate in the same circumferential direction with the rotation of the shaft 2a about the central axis C. The housing 5 is a case that houses the motor 2, the first impeller 3, and the second impeller 4, and is made of, for example, resin.

  That is, the blower 1 includes a motor 2 having a shaft 2a that rotates about a center axis C, a first impeller 3 connected to one end of the shaft 2a on one side in the axial direction, and an end on the other side in the axial direction. It has a second impeller 4 and a housing 5 that houses the motor 2, the first impeller 3, and the second impeller 4 therein.

  The housing 5 has a first air inlet 51, a second air inlet 52, an air outlet 53, a first air tunnel 54, a second air tunnel 55, and a wall 56. The first intake port 51 and the second intake port 52 are openings for introducing external air into the housing 5. In the housing 5, the first intake port 51 is located axially above the first impeller 3, and the second intake port 52 is located axially below the second impeller 4.

  The air outlet 53 is an opening for discharging air sucked into the housing 5 through the first air inlet 51 and the second air inlet 52 to the outside. The air outlet 53 is formed at a predetermined position on the outermost peripheral surface 5 a in the radial direction in the housing 5. Therefore, in the housing 5, the air outlet 53 is located radially outward of the shaft 2 a from the first impeller 3 and the second impeller 4. The number of air outlets 53, that is, the number of openings forming the air outlets 53 is one.

  The first wind tunnel 54 is a wind tunnel that forms an air flow path that guides the air sucked from the first air inlet 51 to the air outlet 53. The first wind tunnel 54 communicates with the first intake port 51 and extends in the circumferential direction of the shaft 2a. The most downstream side in the air flow direction in the circumferential direction of the first wind tunnel 54 communicates with the air outlet 53.

  The second wind tunnel 55 is a wind tunnel that forms a flow path of air that guides the air sucked from the second intake port 52 to the blow port 53. The second wind tunnel 55 communicates with the second air inlet 52 and extends in the circumferential direction of the shaft 2a. The most downstream side in the air flow direction in the circumferential direction of the second wind tunnel 55 communicates with the air outlet 53. The first wind tunnel 54 and the second wind tunnel 55 have a first opening 57 and a second opening 58 on the most upstream side in the flow direction of each air in the circumferential direction, respectively.

  A space S extending in the axial direction exists between the first opening 57 and the air outlet 53 and between the second opening 58 and the air outlet 53. Therefore, the first opening 57 and the second opening 58 are open facing the space S, and the air outlet 53 is also open facing the space S. Further, the first opening 57 and the second opening 58 are located radially outside (outer peripheral side) of the first impeller 3 and the second impeller 4, respectively, and are spaced apart in the axial direction. The downstream side of the first wind tunnel 54 and the downstream side of the second wind tunnel 55 are connected to the air outlet 53 via the space S. For this reason, the downstream side of the first wind tunnel 54 and the downstream side of the second wind tunnel 55 are also opened facing the space S.

  The wall portion 56 is a wall that separates the first wind tunnel 54 and the second wind tunnel 55 in the axial direction. In other words, the wall 56 is a wall for separating the first wind tunnel 54 and the second wind tunnel 55 in the axial direction. The wall 56 extends in the circumferential direction of the shaft 2a. The axial thickness of the wall portion 56 changes in the circumferential direction, which will be described later. In the present embodiment, in the wall portion 56, a position on the upstream side in the circumferential direction of the air flow is referred to as a starting end 56U, and a position on the downstream side is referred to as a terminal end 56D.

  That is, the housing 5 includes a first intake port 51 located on one axial side of the first impeller 3, a second intake port 52 located on the other axial side of the second impeller 4, and a first impeller 3. And a single air outlet 53 located radially outward of the shaft 2a relative to the second impeller 4 and communicates with the first air inlet 51 to extend in the circumferential direction of the shaft 2a. A first wind tunnel 54 that communicates with the air outlet 53 at the most downstream side and a circumferential direction of the shaft 2 a that communicates with the second intake port 52, and a most downstream side of the air flow direction in the circumferential direction communicates with the air outlet 53. It has a second wind tunnel 55 and a wall 56 extending in the circumferential direction and separating the first wind tunnel 54 and the second wind tunnel 55 in the axial direction. The first wind tunnel 54 and the second wind tunnel 55 have a first opening 57 and a second opening 58 on the most upstream side in the flow direction of each air in the circumferential direction, respectively.

(1-2. Impeller case constituting housing)
Next, details of the above-described housing 5 will be described with reference to FIGS. 6 and 7 in addition to FIGS. FIG. 6 is a longitudinal sectional view of the blower 1 cut in the axial direction along the line AA in FIG. FIG. 7 is a longitudinal sectional view of the blower 1 cut in the axial direction along line BB in FIG. FIG. 7 is also a longitudinal sectional view passing through the terminal end 56D of the wall portion 56. Although the inside of the motor 2 is not shown in FIGS. 6 and 7, only the outer shape of the motor 2 is shown by a solid line for convenience. The motor 2 may be configured such that components such as a stator and a rotor are individually arranged inside the housing 5.

  The housing 5 has a first impeller case 6 and a second impeller case 7. The first impeller case 6 houses the first impeller 3, and the second impeller case 7 houses the second impeller 4. Therefore, the first impeller case 6 is located on one side (upper side) in the axial direction, and the second impeller case 7 is located on the other side (lower side) in the axial direction. The first impeller 3 and the first impeller case 6 and the second impeller 4 and the second impeller case 7 are symmetrical with respect to a plane L orthogonal to the central axis C and passing through the axial center of the wall 56. is there.

  The first impeller case 6 has a first divided wall portion 56a and a first divided air outlet 53a, in addition to the first intake port 51 and the first wind tunnel 54 described above. The first divided wall portion 56a is one of the two portions obtained by dividing the wall portion 56 up and down on a plane perpendicular to the axial direction. That is, the first divided wall portion 56a is the upper half of the wall portion 56. The first divided air outlet 53a is one of the two vertically divided air outlets 53 in a plane perpendicular to the axial direction. That is, the first divided air outlet 53 a is the upper half of the air outlet 53.

  The second impeller case 7 has a second divided wall portion 56b and a second divided air outlet 53b, in addition to the above-described second intake port 52 and the second wind tunnel 55. The second divided wall portion 56b is the other of the two vertically divided walls 56 in a plane perpendicular to the axial direction. That is, the second divided wall portion 56b is a lower half of the wall portion 56. The second divided air outlet 53b is the other of the two divided air outlets 53. That is, the second divided air outlet 53 b is the lower half of the air outlet 53.

  That is, the housing 5 has a first impeller case 6 that houses the first impeller 3 and a second impeller case 7 that houses the second impeller 4. The first impeller case 6 has a first intake port 51, a first wind tunnel 54, a first divided wall portion 56 a that is one of two divided wall portions 56, and one of two divided ventilating holes 53. And a first divided air outlet 53a. The second impeller case 7 includes a second intake port 52, a second wind tunnel 55, a second divided wall portion 56 b that is the other of the two divided wall portions 56, and the other of the two divided air outlets 53. And a second divided air outlet 53b. With this configuration, the first impeller case 6 and the second impeller case 7 can be separately formed, and these can be connected in the axial direction to easily realize the housing 5.

  Further, the first impeller case 6 has a first upper case 61 and a first lower case 62. The first upper case 61 has a first intake port 51. The first lower case 62 is located on the other axial side (lower side) than the first upper case 61, and is connected to the first upper case 61 in the axial direction.

  The second impeller case 7 has a second upper case 71 and a second lower case 72. The second lower case 72 has a second air inlet 52. The second upper case 71 is located between the first lower case 62 and the second lower case 72, and is connected to the first lower case 62 and the second lower case 72 in the axial direction.

  The first lower case 62 is provided with one first divided wall 56a constituting the wall 56, and the second upper case 71 is provided with the other second divided wall 56b constituting the wall 56. Is located. Thereby, the wall portion 56 is located over the first lower case 62 and the second upper case 71.

  That is, when one side in the axial direction is set to the upper side and the other side in the axial direction is set to the lower side, the first impeller case 6 includes the first upper case 61 having the first intake port 51 and the first upper case 61 in the axial direction. And a first lower case 62 to be connected. The second impeller case 7 has a second lower case 72 having a second air inlet 52, and a second upper case 71 connected to the first lower case 62 and the second lower case 72 in the axial direction. The wall portion 56 is located over the first lower case 62 and the second upper case 71.

  With this configuration, by connecting the first upper case 61, the first lower case 62, the second upper case 71, and the second lower case 72 in the axial direction, the first impeller case 6 and the second impeller case 7, and furthermore, The housing 5 having the wall 56 can be easily configured, and the assemblability of the housing 5 can be improved. Further, a space for disposing the motor 2 can be easily formed between the first lower case 62 and the second upper case 71, and the assemblability of the blower 1 can be improved.

  The first upper case 61 has a first upper wind tunnel 54a. The first lower case 62 has a first lower wind tunnel 54b. The first upper wind tunnel 54 a is a wind tunnel that forms a flow path of air communicating with the first intake port 51. The first lower wind tunnel 54b is a wind tunnel that forms an air flow passage communicating with the first upper wind tunnel 54a. The above-described first wind tunnel 54 is configured by aligning the first upper wind tunnel 54a and the first lower wind tunnel 54b in the axial direction.

  The second upper case 71 has a second upper wind tunnel 55a. The second lower case 72 has a second lower wind tunnel 55b. The second upper wind tunnel 55 a is a wind tunnel that forms a flow path of air that communicates with the second intake port 52. The second lower wind tunnel 55b is a wind tunnel that forms an air flow path communicating with the second upper wind tunnel 55a. The above-described second wind tunnel 55 is configured by aligning the second upper wind tunnel 55a and the second lower wind tunnel 55b in the axial direction. The first lower wind tunnel 54b of the first lower case 62 and the second upper wind tunnel 55a of the second upper case 71 are separated in the axial direction by the above-described wall portion 56.

  That is, the first wind tunnel 54 has a first upper wind tunnel 54a communicating with the first intake port 51 and a first lower wind tunnel 54b communicating with the first upper wind tunnel 54a. The second wind tunnel 55 has a second lower wind tunnel 55b communicating with the second intake port 52, and a second upper wind tunnel 55a communicating with the second lower wind tunnel 55b. The first upper case 61 has a first upper wind tunnel 54a. The first lower case 62 has a first lower wind tunnel 54b. The second upper case 71 has a second upper wind tunnel 55a. The second lower case 72 has a second lower wind tunnel 55b. The wall portion 56 axially separates the first lower wind tunnel 54b of the first lower case 62 and the second upper wind tunnel 55a of the second upper case 71.

  With this configuration, by connecting the first upper case 61 and the first lower case 62 in the axial direction, the first impeller case having the first wind tunnel 54 combined by the first upper wind tunnel 54a and the first lower wind tunnel 54b 6 can be realized. Further, by connecting the second upper case 71 and the second lower case 72 in the axial direction, the second impeller case 7 having the second wind tunnel 55 combined by the second upper wind tunnel 55a and the second lower wind tunnel 55b is provided. Can be realized. Furthermore, by connecting the first lower case 62 and the second upper case 71 in the axial direction, the housing 5 in which the first lower wind tunnel 54b and the second upper wind tunnel 55a are separated in the axial direction by the wall portion 56 is realized. be able to.

(1-3. Connection in the axial direction of each case constituting the housing)
As shown in FIGS. 1 to 5, the first lower case 62 has a convex portion 81. The protrusion 81 is a protrusion located on the outer peripheral surface 62 a on the radial outside of the first lower case 62. The upper surface of the convex portion 81 on the outer peripheral surface 62a is inclined downward on the outer peripheral side. On the other hand, the first upper case 61 has a hook portion 82. The hook portion 82 has elasticity, and is located on the outer peripheral surface 61 a on the radial outside of the first upper case 61. The hook portion 82 has a bent shape that projects from the position on the outer peripheral surface 61 a toward the first lower case 62 and bends along the outer shape of the convex portion 81. The outer peripheral surface 61a of the first upper case 61 and the outer peripheral surface 62a of the first lower case 62 are included in the outer peripheral surface 5a of the housing 5.

  When the first upper case 61 is moved closer to the first lower case 62 side from the upper side in the axial direction, the convex portion 81 of the first lower case 62 pushes up the hook portion 82 of the first upper case 61, and the hook portion 82 is slightly elastic. Deform. Then, when the lower end in the axial direction of the hook portion 82 passes through the convex portion 81, the pushing of the hook portion 82 by the convex portion 81 is released, and the hook portion 82 returns to the state before the elastic deformation by the restoring force. , The projection 81. As a result, the first upper case 61 is fixed to the first lower case 62 and does not come off in the axially upper direction with respect to the first lower case 62 unless the hook of the hook portion 82 is intentionally released.

  Similarly, the second upper case 71 has a convex portion 81. The convex portion 81 is a protrusion located on the outer peripheral surface 71 a on the radial outside of the second upper case 71. The lower surface of the convex portion 81 on the outer peripheral surface 71a is inclined upward on the outer peripheral side. On the other hand, the second lower case 72 has a hook portion 82. The hook portion 82 has elasticity and is located on the outer peripheral surface 72 a on the radially outer side of the second lower case 72. The hook portion 82 has a bent shape that protrudes from a position on the outer peripheral surface 72 a toward the second upper case 72 and bends along the outer shape of the convex portion 81. The outer peripheral surface 71a of the second upper case 71 and the outer peripheral surface 72a of the second lower case 72 are included in the outer peripheral surface 5a of the housing 5.

  When the second lower case 72 is moved closer to the second upper case 71 side from the lower side in the axial direction, the convex portion 81 of the second upper case 71 pushes up the hook portion 82 of the second lower case 72, and the hook portion 82 slightly Elastically deform. Then, when the upper end in the axial direction of the hook portion 82 has passed the convex portion 81, the lifting of the hook portion 82 by the convex portion 81 is released, and the hook portion 82 returns to the state before the elastic deformation by the restoring force. , The projection 81. As a result, the second lower case 72 is fixed to the second upper case 71 and does not come off in the axial lower direction with respect to the second upper case 71 unless the hook 82 is intentionally released.

  As described above, the first upper case 61 and the first lower case 62, and the second upper case 71 and the second lower case 72 are all fixed by hooking the hooks 82 on the protrusions 81. . A structure in which the two members are fastened by the convex portion 81 and the hook portion 82 having elasticity as described above is referred to as a snap fit 8.

  Therefore, in the above example, the first upper case 61 and the second upper case 71 are fixed to the first lower case 62 and the second lower case 72 by the snap fit 8, respectively. In this case, the first upper case 61 and the first lower case 62 can be easily connected with a simple configuration using the snap fit 8, and the second upper case 71 and the second lower case 72 can be easily connected. Can be connected. Therefore, the assemblability of the housing 5 and thus the blower 1 can be improved.

  The first upper case 61 and the first lower case 62, and the second upper case 71 and the second lower case 72 may be fixed with screws, an adhesive, or the like.

  A plurality of flanges 9 are provided at the lower end of the outer peripheral surface of the first lower case 62 and the upper end of the outer peripheral surface of the second upper case 71. By screwing the flange 9 of the first lower case 62 and the flange 9 of the second upper case 71, the first impeller case 6 and the second impeller case 7 are connected and fixed in the axial direction. Note that the first lower case 62 and the second upper case 71 may be fixed using a snap fit, an adhesive, or the like.

(1-4. Details of impeller)
Next, the details of the first impeller 3 and the second impeller 4 housed in the first impeller case 6 and the second impeller case 7, respectively, will be described mainly with reference to FIGS.

  The first impeller 3 has a first impeller base 31, a plurality of first blade portions 32, and a first shroud 33. The first impeller base 31 is a disk-shaped flat plate for supporting the plurality of first blade portions 32. At the center of the first impeller base 31, a first fixing portion 34 fixed to one end of the shaft 2a is formed. The first fixing part 34 may be configured to be fitted into the center of the first impeller base 31 or may be configured to be formed integrally with the first impeller base 31.

  The plurality of first blade portions 32 are fixed on the first impeller base 31 at radially outer positions than the first fixing portion 34 at equal intervals in the circumferential direction. The first shroud 33 has a first opening 33 a having a larger diameter than the first intake port 51, and is provided so as to sandwich the plurality of first blades 32 with the first impeller base 31.

  The second impeller 4 has a second impeller base 41, a plurality of second blade portions 42, and a second shroud 43. The second impeller base 41 is a disk-shaped flat plate for supporting the plurality of second blade portions 42. At the center of the second impeller base 41, a second fixing portion 44 fixed to the other end of the shaft 2a is formed. The second fixing portion 44 may be configured to be fitted into the center of the second impeller base 41, or may be configured to be formed integrally with the second impeller base 41.

  The plurality of second blade portions 42 are fixed on the second impeller base 41 at positions radially outside the second fixing portion 44 at equal intervals in the circumferential direction. The second shroud 43 has a second opening 43 a having a larger diameter than the second intake port 52, and is provided so as to sandwich the plurality of second blades 42 with the second impeller base 41.

  In the present embodiment, the number of the first blades 32 of the first impeller 3 and the number of the second blades 43 of the second impeller 4 are the same. The circumferential position of each first blade 32 and the circumferential position of each second blade 42 are the same. That is, the first impeller 3 and the second impeller 4 have the same number of the first blade portions 32 and the second blade portions 42, respectively, and the position of the first impeller 3 in the circumferential direction of the first blade portions 32 The position of the second impeller 4 in the circumferential direction of the second blade portion 42 is the same.

(1-4. Operation)
Next, the operation of the configuration of the blower 1 described above will be described with reference to FIGS. 6, 9 and 10 in addition to FIGS. FIG. 8 is a perspective view of the blower 1 in a state where the illustration of the first upper case 61 is omitted. FIG. 9 is a perspective view of the blower 1 in a state where the illustration of the first upper case 61, the first lower case 62, and the second upper case 71 is omitted. FIG. 10 is a plan view of the blower 1 in a state where the illustration of the first upper case 61 is omitted. Note that, in these drawings, arrows indicated by thick lines indicate directions in which air flows. Similarly, in other drawings, arrows indicated by thick lines indicate directions in which air flows. That is, the bold arrow in FIGS. 8 and 10 indicates the direction of air flowing through the first wind tunnel 54, and the bold arrow in FIG. 9 indicates the direction of air flowing through the second wind tunnel 55.

  When the first impeller 3 and the second impeller 4 are rotated by the motor 2, air is drawn into the blower 1 from the first intake port 51 and the second intake port 52 in the axial direction, respectively. More specifically, by the rotation of the first impeller 3, air is sucked downward from the first air inlet 51 in the axial direction and enters the first wind tunnel 54. The air that has entered the first wind tunnel 54 proceeds radially outward by the first impeller 3, and then flows in the circumferential direction toward the air outlet 53.

  On the other hand, due to the rotation of the second impeller 4, air is sucked from the second intake port 52 to the upper side in the axial direction and enters the second wind tunnel 55. The air that has entered the second wind tunnel 55 proceeds radially outward by the second impeller 4, and then flows in the circumferential direction toward the air outlet 53. The air flowing through the first wind tunnel 54 joins the air flowing through the second wind tunnel 55 near the air outlet 53. The air after the merging is discharged to the outside from the single blow port 53.

  Here, as shown in FIGS. 1, 8, 9, etc., the first wind tunnel 54 and the second wind tunnel 55 are provided with the first opening 57 and the second opening 57 at the most upstream side in the circumferential air flow direction. Since each of them has 58, the upstream side is open. Thereby, even if the first impeller 3 and the second impeller 4 rotate, it is possible to reduce the generation of a large negative pressure on the upstream side of the first wind tunnel 54 and the second wind tunnel 55. For this reason, generation of noise due to the negative pressure can be reduced.

<2. Configuration and Effect of Increasing Ventilation Air Volume>
In the configuration in which the first wind tunnel 54 has the first opening 57 on the upstream side as described above, the upstream side of the first wind tunnel 54 is connected to the downstream side of the first wind tunnel 54 and the first wind tunnel 54 through the first opening 57. Connect externally and spatially. In the configuration in which the second wind tunnel 55 has the second opening 58 on the upstream side, the upstream side of the second wind tunnel 55 is connected to the downstream side of the second wind tunnel 55 and the outside of the second wind tunnel 55 via the second opening 58. Connect spatially.

  Therefore, the air flowing from the upstream side to the downstream side in the circumferential direction inside the first wind tunnel 54 and the second wind tunnel 55 again flows through the first opening 57 or the second opening 58 to the first wind tunnel. There is a concern that the air blows back into the air passage 54 or the second wind tunnel 55, thereby reducing the amount of air blown from the air outlet 53.

  However, when the blower 1 also employs the following configuration or setting, it is possible to suppress the above-described decrease in the amount of blowing air, and to increase the amount of blowing air as compared to a case where the above configuration or setting is not adopted. .

(2-1. Setting of wall thickness)
For convenience of the description below, a portion of the wall portion 56 shown in FIG. 6 that is located on the upstream side in the air flow direction, that is, a portion closer to the start end 56U (see FIG. 3) is denoted by reference numeral 56M. . In the wall portion 56 shown in FIG. 6, a portion located on the downstream side in the air flow direction, that is, a portion closer to the terminal end 56D is denoted by reference numeral 56N. Further, in the wall shown in FIG. 7, a portion different from the terminal end 56D is indicated by reference numeral 56P. Note that the circumferential positional relationship between the starting end 56U, the part 56M, the part 56P, the part 56N, and the terminal end 56D of the wall 56 is as shown in FIG. That is, the starting end 56U, the part 56M, the part 56P, the part 56N, and the terminal end 56D of the wall 56 are located in this order from the upstream side to the downstream side in the circumferential air flow direction.

  The axial thicknesses of the starting end 56U, the part 56M, the part 56P, the part 56N, and the terminal end 56D of the wall 56 are TU, T4, T3, T2, and T1, respectively. At this time, the unit of the thickness of the wall portion 56 in the axial direction is, for example, mm. In the present embodiment, the corner of the starting end 56U is chamfered (see FIG. 1 and the like). In this case, the axial thickness TU of the starting end 56U refers to the thickness of the axially thickest part of the chamfered portion of the starting end 56U.

  In the present embodiment, the axial thickness of the wall 56 is set as follows. That is, the thickness of the wall portion 56 in the axial direction decreases from the starting end 56U of the wall portion 56 located on the upstream side in the circumferential direction of the air flow toward the terminal end 56D of the wall portion 56 located on the downstream side. Therefore, the relationship between the axial thickness of the starting end 56U, the site 56M, the site 56P, the site 56N, and the end 56D of the wall 56 is TU> T4> T3> T2> T1>.

  As described above, the thickness of the wall portion 56 that separates the first wind tunnel 54 and the second wind tunnel 55 in the axial direction becomes thinner from the starting end 56U in the circumferential direction toward the end 56D. For this reason, each air flowing in the first wind tunnel 54 and the second wind tunnel 55 in the circumferential direction is concentrated on the inner side in the axial direction, that is, on the center side of the blower 1 from the starting end 56U side of the wall 56 toward the end 56D side. You.

  Thereby, each air discharged from the downstream side of the first wind tunnel 54 and the second wind tunnel 55 is exposed to the end face of the start end 56U thicker than the end 56D of the wall portion 56, that is, to the air outlet 53 side at the start end 56U. And collide with the surface P (see FIGS. 1 and 2). Thereafter, the air tends to advance to the blow port 53 side.

  For this reason, even if the first wind tunnel 54 and the second wind tunnel 55 have the first opening 57 and the second opening 58, respectively, in order to reduce the noise as described above, the air is supplied to the air outlet 53 side. Can be led to. Therefore, each air discharged from the downstream side of the first wind tunnel 54 and the second wind tunnel 55 reenters the first wind tunnel 54 or the second wind tunnel 55 through the first opening 57 or the second opening 58. Can be reduced.

  Therefore, even if the first opening 57 and the second opening 58 are provided to reduce noise, each air discharged from the downstream side of the first wind tunnel 54 and the second wind tunnel 55 is supplied to the air outlet 53. , And can be efficiently discharged from the air outlet 53. As a result, the flow rate of the blower 1 can be increased. That is, it is possible to increase the amount of air blown by the blower 1 while reducing the generation of noise due to the negative pressure at the upstream end of the first wind tunnel 54 and the second wind tunnel 55.

  In addition, since there is only one air outlet 53, the air collected in the central portion in the axial direction by setting the thickness of the wall portion 56 described above, that is, the air flowing through the first wind tunnel 54 and the second wind tunnel 55 is removed. It can be discharged from the single air outlet 53 in the state of being aggregated as it is. Accordingly, it is possible to suppress the dispersion of the air exhausted from the air outlet 53 and increase the amount of air blown in one direction. In addition, if there is only one blow port 53, the respective air collected in the central portion in the axial direction can be discharged as it is, so that a configuration for collecting the respective air in the axial direction, that is, a wall is provided. It is easy to adopt a configuration in which the thickness of the portion 56 is changed as described above.

  In addition, since the thickness of the wall portion 56 decreases from the circumferential start end 56U to the terminal end 56D, the ratio of the axial thickness TU of the start end 56U of the wall portion 56 to the axial thickness T1 of the terminal end 56D ( TU / T1) exceeds 1, but from the viewpoint of more easily exhibiting the above-mentioned effects, TU / T1 is preferably 1.5 or more, more preferably 2.0 or more, More preferably, it is 3.0 or more. Further, the axial thickness of the wall portion 56 may change at a constant rate from the upstream side to the downstream side in the circumferential direction, or may change more abruptly on the downstream side than on the upstream side, It may change more abruptly on the upstream side than on the downstream side. However, from the viewpoint of allowing the air to flow smoothly in the first wind tunnel 54 and the second wind tunnel 55, the axial thickness of the wall portion 56 is constant at a constant rate from the upstream in the circumferential direction to the downstream. It is desirable to change.

(2-2. Symmetry of impeller and impeller case)
As described above, in the present embodiment, the first blade portion 32 of the first impeller 3 and the second blade portion 42 of the second impeller 4 have the same number and the same circumferential position. Thus, when the first impeller 3 and the second impeller 4 are rotated at the same rotational speed, their rotations are synchronized. Thereby, the force for pushing out the air from the air outlet 53 increases, and the air flow rate can be further increased. Further, when the rotation of the first impeller 3 and the rotation of the second impeller 4 are synchronized, noise is reduced as compared with the case where the rotation is asynchronous.

  In the present embodiment, the first impeller 3 and the second impeller 4 are symmetrical with respect to the plane L, and have a first impeller case 6 having at least a first wind tunnel 54 and a second impeller having at least a second wind tunnel 55. The two impeller case 7 is symmetrical with respect to the plane L. Thereby, the air blowing capacity of each air can be made uniform between the first impeller case 6 and the second impeller case 7. Therefore, the force for pushing out the air from the air outlet 53 increases, and the air flow rate can be further increased. Further, since the difference in the air flow rate between the first impeller case 6 and the second impeller case 7 is reduced, it is possible to reduce the occurrence of noise due to the difference in the air flow rate.

<3. Configuration for reducing turbulence>
In the present embodiment, by employing the following configuration of the blower 1, it is possible to reduce turbulence generated in the vicinity of the air outlet 53 at the time of blowing, thereby reducing noise due to turbulence. Hereinafter, this will be described in more detail.

(3-1. Regarding the positional relationship between the end of the wall and the air outlet)
As shown in FIG. 10, the terminal end 56 </ b> D of the wall portion 56 is located upstream of the air outlet 53 in the air flow direction. Due to such a positional relationship between the terminal end 56D and the air outlet 53, air flowing in the first wind tunnel 54 in the circumferential direction toward the air outlet 53, and air flowing in the second wind tunnel 55 in the circumferential direction toward the air outlet 53, Can be merged between the terminal end 56D and the air outlet 53, that is, in the housing 5. Thereby, after the direction of the flow of the merged air is adjusted in the housing 5, the merged air can be discharged from the air outlet 53. As a result, it is possible to reduce the generation of turbulence at the blower port 53 and the generation of noise due to the turbulence.

  Note that the terminal end 56D of the wall portion 56 may be connected to the air outlet 53 in order to achieve the main purpose of the present embodiment of increasing the amount of air blown.

(3-2. Regarding the positional relationship between the end of the wall and the edge)
As shown in FIG. 10, the housing 5 has an edge 59. The edge portion 59 forms a downstream edge of the air outlet 53. The inner surface 59a, which is the inner surface in the radial direction of the edge portion 59, is a plane extending from the terminal end 56D of the wall portion 56 in the circumferential tangent direction of the outer peripheral surface 5a when viewed from the axial direction. That is, the housing 5 has an edge portion 59 that forms a downstream edge of the air outlet 53, and a radially inner surface of the edge portion 59 has an inner surface 59 a extending in a circumferential tangential direction from a terminal end 56 </ b> D of the wall portion 56. Have.

  As described above, since the housing 5 has the edge portion 59 and the edge portion 59 has the inner surface 59a, each air flowing through the first wind tunnel 54 and the second wind tunnel 55 flows downstream of the air outlet 53 at the edge portion 59. Along the inner surface 59a, that is, a plane perpendicular to the radial direction. Thereby, the straightness of the air discharged from the blower port 53 can be improved, and the generation of turbulence at the blower port 53 can be reduced, and the generation of noise due to the turbulent flow can be reduced. Further, since the straightness of the air is improved, it is possible to increase the air flow rate in one direction.

  In particular, the edge portion 59 protrudes toward the air outlet 53 from a position radially outside the terminal end 56D of the wall portion 56. Accordingly, each air flowing through the first wind tunnel 54 and the second wind tunnel 55 travels in the direction in which the edge 59 protrudes. That is, each of the above-mentioned airs travels straight from the terminal end 56 </ b> D of the wall portion 56 to the air outlet 53 along the inner surface 59 a of the edge portion 59. Therefore, the straightness of the air discharged from the air outlet 53 can be improved, and the air flow rate in one direction can be increased.

<4. Blower>
The blower 1 of the present embodiment can be applied to a blower such as an air purifier. Hereinafter, a blower to which the blower 1 can be applied will be described.

(4-1. Schematic configuration of blower)
FIG. 11 is a perspective view of the blower 100, and FIG. 12 is a perspective view of the blower 100 in a state where illustration of a housing and an internal blower is omitted. FIG. 13 is an exploded perspective view of the blower 100 in a state where a housing is not shown, and FIG. 14 is a partial perspective view of the blower 100 at the time of blowing. The blower 100 has a housing 200 and a filter 300 in addition to the blower 1 described in the present embodiment. The housing 200 houses the blower 1 therein. The housing 200 has a louver 201. The louver 201 is an outlet for guiding the air discharged from the blower 1 inside the housing 200 to the outside.

  The filter 300 is a dust collecting filter that removes dust, pollen, and the like in the air, and is axially outward with respect to the first intake port 51 and the second intake port 52 of the blower 1 disposed in the housing 2. Respectively. The filter 300 has, for example, a carbon filter 301 and a HEPA filter (High Efficiency Particulate Air Filter) 302. The carbon filter 301 is a general dust filter used for an air purifier. The HEPA filter 302 is a high-performance dust collection filter having a higher dust collection ability than the carbon filter 301. Note that the filter 300 may have a configuration including at least one of the carbon filter 301 and the HEPA filter 302. Further, the filter 300 may be configured to further include a higher-performance dust collection filter such as an ULPA filter (Ultra Low Penetration Air Filter).

  That is, the blower 100 includes the blower 1, the housing 200 that houses the blower 1, and the filter 300 that is disposed in the housing 200 at a position facing the first intake port 51 and the second intake port 52 of the blower 1. And Since the filter 300 is located at a position opposed to the first intake port 51 and the second intake port 52, which are the two intake ports of the blower 1, dust contained in air sucked from each intake port is filtered by each filter. The air blower 100 that removes clean air from the louver 201 by removing the air from the louver 201, for example, an air purifier can be realized.

(4-2. Rotating configuration of blower)
The above-described blower 100 has a rotating mechanism 400 that adjusts the blowing direction of the blower 1 by rotating the blower 1 with respect to the housing 200. Hereinafter, details of the rotation mechanism 400 will be described.

  FIGS. 15 and 16 are side views when the inside of the housing 200 of the blower 100 is viewed from the second intake port 52 side. FIG. 15 shows a state before the rotation of the blower 1. FIG. 16 shows a state after the rotation of the blower 1. 15 and 16, the outer shape of the housing 200 is indicated by broken lines for convenience. The rotation mechanism 400 has a main body side gear 401, a drive gear 402, and a support roller 403.

  The main body side gear 401 is formed on the outer peripheral surface 5a of the blower 1 along the circumferential direction. The main body side gear 401 may be formed over the entire outer circumferential surface 5a in the circumferential direction, or may be formed only on a part of the circumferential direction. The drive gear 402 meshes with the main body side gear 401 and rotates around a rotation shaft 402a positioned parallel to the central axis C. The rotating shaft 402a is supported by the housing 200 via a bearing (not shown). The support roller 403 is a roller that supports the blower 1 rotatably in the circumferential direction with respect to the housing 200. The support roller 403 is supported by the housing 200 so as to be parallel to the center axis C of the blower 1, and supports the blower 1 by contacting the outer peripheral surface 5 a of the blower 1. In the present embodiment, three support rollers 403 are provided. However, the number of support rollers 403 may be any number as long as the support rollers 403 can be supported, and is not limited to the above three.

  That is, the rotation mechanism 400 is configured such that the main body side gear 401 formed on the outer peripheral surface 5a of the blower 1 along the circumferential direction and the main body side gear 401 mesh with the rotation axis 402a parallel to the central axis C. It has a driving gear 402 that rotates and a support roller 403 that rotatably supports the blower 1 with respect to the housing 200. In this configuration, for example, when the drive gear 402 rotates in the direction E in FIG. 15, the rotational driving force of the drive gear 402 is transmitted to the blower 1 via the main body side gear 401, so that the blower 1 rotates in the G direction. I do. Thereby, the blowing direction from the blowing port 53 of the blower 1 changes downward. On the other hand, when the drive gear 402 rotates in the F direction in FIG. 16, the rotational driving force of the drive gear 402 is transmitted to the blower 1 via the main body side gear 401, and the blower 1 rotates in the H direction. Thereby, the blowing direction from the blowing port 53 of the blower 1 changes upward.

  As described above, since the blower 1 has the rotation mechanism 400, the blower 1 can be rotated by the rotation mechanism 400, and the direction of the air discharged from the blower port 53 of the blower 1 can be freely changed. , Convenience can be improved.

  In addition, for example, it is preferable that the outer peripheral surface of the housing 5 of the blower 1 of the present embodiment has a cylindrical shape extending in the direction of the central axis C. At this time, the plurality of support rollers 403 hold the housing 5 which is a cylindrical surface, and can easily rotate the blower 1. In particular, with the above-described configuration of the rotation mechanism 400, the blower 1 can be rotated in the circumferential direction with respect to the housing 200 in a state where the blower 1 is supported by the support rollers 403. Thereby, the blowing direction of the blower 1 can be easily adjusted in a plane perpendicular to the central axis C of the blower 1.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications can be made without departing from the gist of the invention. Further, the above-described embodiment and its modified examples can be arbitrarily combined as appropriate.

  The blower of the present invention can be used for a blower such as an air purifier.

REFERENCE SIGNS LIST 1 blower 2 motor 2a shaft 3 first impeller 4 second impeller 5 housing 6 first impeller case 7 second impeller case 8 snap fit 32 first blade section 42 second blade section 51 first intake port 52 second intake port 53 Blow port 53a First divided blow port 53b Second divided blow port 54 First wind tunnel 54a First upper wind tunnel 54b First lower wind tunnel 55 Second wind tunnel 55a Second upper wind tunnel 55b Second lower wind tunnel 56 Wall 56a First divided wall Part 56b Second divided wall part 56U Start end 56D End 57 First opening 58 Second opening 59 Edge 59a Inner surface 61 First upper case 62 First lower case 71 Second upper case 72 Second lower case 100 Blower 200 Housing 300 Filter 400 Rotating mechanism 401 Body side gear 402 Drive gear 403 Supporting roller C Central axis L Plane

Claims (13)

A motor having a shaft that rotates about a central axis;
A first impeller and a second impeller connected to one end in the axial direction and the other end in the axial direction of the shaft, respectively;
A housing for housing the motor, the first impeller and the second impeller therein,
The housing is
A first intake port located on one side in the axial direction with respect to the first impeller;
A second intake port located on the other axial side of the second impeller;
A single air outlet located radially outward of the shaft relative to the first impeller and the second impeller;
A first wind tunnel communicating with the first intake port and extending in a circumferential direction of the shaft, and a most downstream side in a circumferential direction of an air flow communicating with the blow port;
A second wind tunnel communicating with the second intake port and extending in a circumferential direction of the shaft, and a most downstream side of an air flow direction in the circumferential direction communicating with the blow port;
A wall extending in the circumferential direction and axially separating the first wind tunnel and the second wind tunnel;
The first wind tunnel and the second wind tunnel each have a first opening and a second opening on the most upstream side in the flow direction of each air in the circumferential direction,
The blower, wherein the thickness of the wall portion in the axial direction decreases from a starting end of the wall portion located on an upstream side in a flow direction of the air in a circumferential direction toward an end of the wall portion located on a downstream side.   2. The blower according to claim 1, wherein the terminal end of the wall portion is located upstream of the air outlet in a flow direction of the air. 3. The first impeller and the second impeller have the same number of first blades and second blades, respectively.
3. The blower according to claim 1, wherein a position of the first impeller in a circumferential direction of the first blade portion is the same as a position of the second impeller in a circumferential direction of the second blade portion. 4. The housing is
A first impeller case accommodating the first impeller;
A second impeller case accommodating the second impeller,
The first impeller case includes the first intake port, the first wind tunnel, a first divided wall portion that is one of the two divided wall portions, and one of the divided air outlets. A first divided blower port,
The second impeller case includes the second intake port, the second wind tunnel, a second divided wall portion that is the other of the two divided wall portions, and a second divided wall portion that is the second divided wall portion. The blower according to any one of claims 1 to 3, further comprising a certain second divided blower port.   The first impeller and the first impeller case, and the second impeller and the second impeller case are symmetrical with respect to a plane orthogonal to the center axis and passing through the axial center of the wall. The blower according to claim 4. When one side in the axial direction is up and the other side in the axial direction is down,
The first impeller case includes:
A first upper case having the first intake port;
A first lower case axially connected to the first upper case,
The second impeller case includes:
A second lower case having the second intake port;
A second upper case axially connected to the first lower case and the second lower case,
The blower according to claim 4, wherein the wall portion is located over the first lower case and the second upper case. The first wind tunnel has a first upper wind tunnel communicating with the first intake port, and a first lower wind tunnel communicating with the first upper wind tunnel.
The second wind tunnel has a second lower wind tunnel communicating with the second intake port, and a second upper wind tunnel communicating with the second lower wind tunnel.
The first upper case has the first upper wind tunnel,
The first lower case has the first lower wind tunnel,
The second upper case has the second upper wind tunnel,
The second lower case has the second lower wind tunnel,
The blower according to claim 6, wherein the wall portion axially separates the first lower wind tunnel of the first lower case and the second upper wind tunnel of the second upper case.   The blower according to claim 6, wherein the first upper case and the second upper case are fixed to the first lower case and the second lower case by snap fit, respectively. The housing has an edge forming a downstream edge of the air outlet,
The blower according to any one of claims 1 to 8, wherein a radially inner surface of the edge has an inner surface extending circumferentially tangentially from the terminal end of the wall.   The blower according to claim 9, wherein the edge protrudes from a position radially outward from the terminal end of the wall toward the blower port. A blower according to any one of claims 1 to 10,
A housing for housing the blower,
And a filter disposed in the housing at a position facing the first intake port and the second intake port of the blower.   The blower according to claim 11, further comprising a rotating mechanism that adjusts a blow direction of the blower by rotating the blower with respect to the housing. The rotating mechanism includes:
A body-side gear formed on the outer peripheral surface of the blower along the circumferential direction;
A drive gear that meshes with the main body side gear and rotates about a rotation axis parallel to the central axis;
The blower according to claim 12, further comprising: a support roller that rotatably supports the blower with respect to the housing.

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