JP2018053804A - Air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blower capable of improving blow efficiency.SOLUTION: An air blower has an impeller 10 rotating around a center axis extending upward and downward, and a housing for housing the impeller. The impeller has a base plate 11, and plural blades 12 arranged on the base plate at predetermined intervals in a peripheral direction. A top face of the housing is provided with intake ports covering an upper part of the impeller and penetrating in an axial direction, and a peripheral face of the housing covers a periphery of the impeller, and is provided with exhaust ports penetrating in a radial direction. The blade has an outer peripheral part 12b, and an inner peripheral part 12a arranged on the radial inner side than the outer peripheral part. An area of a gap projecting more upward than the outer peripheral part and connecting upper faces of the adjacent inner peripheral parts in a peripheral direction in the inner peripheral part is not less than an area of a gap connecting outer peripheral faces of the adjacent outer peripheral parts in a peripheral direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a blower.

  A conventional blower is disclosed in Patent Document 1. This blower has a multiblade centrifugal fan that rotates around a central axis that extends vertically, and a scroll casing that houses the multiblade centrifugal fan. An air inlet is provided on the upper wall of the scroll casing, and an air outlet is provided on the side wall of the scroll casing. The multiblade centrifugal fan has a hub that rotates about a central axis, and a plurality of blades that are arranged on the hub at predetermined intervals in the circumferential direction.

  In the blower configured as described above, when the multiblade centrifugal fan rotates, air flows into the scroll casing through the air suction port. The air that has flowed into the scroll casing flows between adjacent blades, and accelerates radially outward along the blades. The air accelerated toward the outside in the radial direction is blown out in the radial direction of the multiblade centrifugal fan, and is exhausted to the outside through the air outlet.

JP 2014-139412 A

  However, according to the blower disclosed in the above-mentioned patent document, a part of the air exhausted radially outward of the blades flows backward in the radial direction from the space between the adjacent blades. For this reason, the air resistance by the airflow which flowed back between adjacent blades generate | occur | produced, and there existed a problem which the ventilation efficiency of an air blower fell.

  An object of this invention is to provide the air blower which can improve ventilation efficiency.

  An exemplary blower of the present invention includes an impeller that rotates about a central axis that extends vertically, and a housing that houses the impeller, and the impeller has a base plate and a predetermined interval in the circumferential direction on the base plate. A plurality of blades disposed on the upper surface of the casing, the upper surface of the casing covers the upper side of the impeller, and is provided with an intake port penetrating in the axial direction. The peripheral surface of the casing is around the impeller An exhaust port penetrating in the radial direction is provided, and the blade has an outer peripheral portion and an inner peripheral portion disposed radially inward of the outer peripheral portion, and the inner peripheral portion is The area of the gap that protrudes upward from the outer peripheral portion and connects the upper surfaces of the adjacent inner peripheral portions in the circumferential direction is equal to or larger than the area of the gap that connects the outer peripheral surfaces of the adjacent outer peripheral portions in the circumferential direction.

  According to the exemplary present invention, a blower capable of improving the blowing efficiency can be provided.

FIG. 1 is an exploded perspective view of a blower according to an embodiment of the present invention. FIG. 2 is a top view of the inside of the blower according to the embodiment of the present invention. FIG. 3 is a side cross-sectional view of the blower according to the embodiment of the present invention. FIG. 4 is a perspective view of the impeller of the blower according to the embodiment of the present invention. FIG. 5 is a top view of the impeller of the blower according to the embodiment of the present invention. FIG. 6 is a side view of the impeller of the blower according to the embodiment of the present invention. FIG. 7 is a side cross-sectional view of a blower according to a first modification of the embodiment of the present invention. FIG. 8 is a side cross-sectional view of a blower according to a second modification of the embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction parallel to the central axis C of the blower 1 is “axial direction”, the direction orthogonal to the central axis C of the blower 1 is “radial direction”, and the arc is centered on the central axis C of the blower 1. The directions along the direction are respectively referred to as “circumferential directions”. Similarly, with respect to the impeller 10, the directions that coincide with the axial direction, the radial direction, and the circumferential direction of the blower 1 when incorporated in the blower 1 are simply “axial direction”, “radial direction”, and “circumferential direction”, respectively. Call it. Further, in the present specification, the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the intake port 3 side of the casing 2 as the upper side with respect to the impeller 10. The vertical direction is simply a name used for explanation, and does not limit the actual positional relationship and direction.

<1. Overall configuration of blower>
A blower according to an exemplary embodiment of the present invention will be described. FIG. 1 is an exploded perspective view of a blower 1 according to an embodiment of the present invention. FIG. 2 is a top view of the inside of the blower 1. FIG. 3 is a side sectional view of the blower 1. The blower 1 is mounted on various OA equipment, medical equipment, household electrical appliances, transportation equipment, and the like.

  The blower 1 has an impeller 10 and a motor 50 in a housing 2. The housing | casing 2 is a substantially cube shape, and has the cover part 2a and the accommodating part 2b. The cover portion 2a is provided with an intake port 3 penetrating in the axial direction. Further, the cover portion 2a has a bell mouth 31 that extends downward (side of the storage portion 2b) at the air inlet 3. The cover portion 2 a covers the upper side of the impeller 10 on the outer peripheral side of the intake port 3.

  The opening part of the storage part 2b is covered with the cover part 2a. One or a plurality of exhaust ports 4 are provided on the peripheral wall of the storage portion 2b. In the present embodiment, two exhaust ports 4 are provided. The exhaust port 4 penetrates the storage part 2b in the radial direction and is disposed on the side surfaces of the storage part 2b which are orthogonal to each other. The storage portion 2 b stores the impeller 10 and the motor 50 that rotate around the central axis C, and the peripheral surface of the storage portion 2 b covers the periphery of the impeller 10. The motor 50 is attached to the bottom surface of the storage portion 2b.

  Note that the air inlet 3 may be provided on the bottom surface of the storage portion 2b instead of the cover portion 2a, and the motor 50 may be attached to the cover portion 2a. That is, the intake port 3 and the exhaust port 4 may be appropriately provided for the members constituting the housing 2.

  An air passage 5 that connects the intake port 3 and the exhaust port 4 is provided in the housing 2, and the impeller 10 is disposed in the air passage 5.

  That is, the blower 1 includes an impeller 10 that rotates around a central axis C that extends vertically, and a housing 2 that houses the impeller 10. The upper surface of the housing 2 formed by the cover portion 2a is provided with an intake port 3 that covers the top of the impeller 10 and penetrates in the axial direction. The peripheral surface of the housing 2 formed by the storage portion 2b covers the periphery of the impeller 10 and is provided with an exhaust port 4 penetrating in the radial direction.

<2. Impeller configuration>
4 to 6 show a perspective view, a top view, and a side view of the impeller 10, respectively. The impeller 10 includes a base plate 11 and a plurality of blades 12. The base plate 11 is formed in a circular shape when viewed from above by a resin molded product. A protrusion 11 a that protrudes upward (toward the intake port 3) is formed at the center of the base plate 11. The upper surface of the protrusion 11 a is disposed above the lower end of the bell mouth 31.

  The motor 50 attached to the bottom surface of the storage portion 2b is disposed inside the protruding portion 11a. A through hole 11b into which the shaft portion 50a of the motor 50 is press-fitted is provided at the center (on the central axis C) of the protruding portion 11a. Thereby, the protrusion part 11a and the axial part 50a are connected, and the base plate 11 is supported rotatably about the central axis C. As will be described later, the base plate 11 rotates counterclockwise as viewed from above by driving the motor 50.

  The plurality of blades 12 are formed integrally with the base plate 11 and are arranged on the base plate 11 at predetermined intervals in the circumferential direction. The inner peripheral end of each blade 12 is disposed in front of the outer peripheral end in the rotational direction. Thereby, each blade | wing 12 inclines with respect to radial direction.

  The blade 12 has an outer peripheral part 12b and an inner peripheral part 12a arranged radially inward of the outer peripheral part 12b. The inner peripheral portion 12a protrudes upward (intake port 3 side) from the outer peripheral portion 12b toward the bell mouth 31 (see FIG. 3). The outer peripheral portion 12 b protrudes outward in the radial direction from the bell mouth 31.

  Further, the area of the gap A1 (see FIGS. 4 and 5) connecting the upper surfaces of the adjacent inner peripheral portions 12a in the circumferential direction is the gap A2 (FIGS. 4 and 6) connecting the outer peripheral surfaces of the adjacent outer peripheral portions 12b in the circumferential direction. The area of reference). That is, the area between the inner peripheral portions 12 a adjacent to each other on the end surface on the intake side of the blade 12 is equal to or larger than the area between the outer peripheral portions 12 b adjacent to each other on the end surface on the exhaust side of the blade 12.

  A distance L1 (see FIG. 5) between the inner peripheral end and the outer peripheral end of the inner peripheral portion 12a is longer than a distance L2 (see FIG. 5) between the inner peripheral end and the outer peripheral end of the outer peripheral portion 12b. The radial distance L5 between the inner peripheral end of the inner peripheral portion 12a and the upper end portion of the protruding portion 11a is shorter than the distance L6 obtained by projecting the distance L1 in the radial direction.

  The impeller 10 further includes an annular connecting member 13 that is connected to at least a part of the upper surface of the adjacent outer peripheral portion 12b. The connecting member 13 is disposed on the outer side in the radial direction on the outer peripheral portion 12 b and is formed integrally with the blade 12. The inner diameter D2 (see FIG. 3) of the connecting member 13 is equal to or larger than the outer diameter D3 (see FIG. 3) of the base plate 11. Thereby, when forming the impeller 10 which has the blade | wing 12 straddling the base plate 11 and the connection member 13, the mutual interference of an up-and-down metal mold | die (not shown) can be prevented. Therefore, it is possible to easily remove the molds on the upper side in the axial direction and the lower side in the axial direction. As a result, the impeller 10 can be integrally formed with a mold, and the mass productivity of the blower 1 can be improved.

  The length L3 (see FIG. 5) in the direction along the outer peripheral portion 12b of the connecting member 13 is equal to or longer than the length L4 (see FIG. 5) on the radially inner side of the connecting member 13 in the outer peripheral portion 12b. Further, the inner diameter D2 (see FIG. 3) of the connecting member 13 is equal to or larger than the diameter D1 (see FIG. 3) of the intake port 3.

<3. Operation of blower>
In the blower 1 configured as described above, when the motor 50 is driven, the impeller 10 rotates about the central axis C. Thereby, air is taken into the housing 2 from the air inlet 3.

  The air taken into the housing 2 passes between the inner peripheral portions 12a of the adjacent blades 12, and is accelerated radially outward by the rotating impeller 10. The air accelerated toward the outside in the radial direction flows between the connecting member 13 and the base plate 11 between the outer peripheral portions 12 b of the adjacent blades 12, and is blown out outward in the radial direction of the impeller 10. The air blown outward in the radial direction of the impeller 10 circulates between the inner peripheral wall of the storage portion 2 b and the impeller 10 and is exhausted from the exhaust port 4 to the outside of the housing 2.

  At this time, the protruding portion 11a protrudes above the lower end of the bell mouth 31, and the radial distance L5 between the inner peripheral end of the inner peripheral portion 12a and the upper end portion of the protruding portion 11a is a distance obtained by projecting the distance L1 in the radial direction. Shorter than L6. For this reason, the air flowing into the housing 2 from the air inlet 3 is guided between the inner peripheral portion 12a from above. Further, the inner peripheral portion 12a of the blade 12 protrudes upward from the outer peripheral portion 12b, and the area of the gap A1 that connects the upper surfaces of the adjacent inner peripheral portions 12a in the circumferential direction is equal to the outer peripheral surface of the adjacent outer peripheral portion 12b in the circumferential direction. It is more than the area of the gap A2 to be connected. For this reason, the flow path of the air guide | induced between the inner peripheral parts 12a is narrowed between the outer peripheral surfaces of the outer peripheral part 12b. Thereby, the wind pressure and the air volume of the airflow S flowing between the adjacent blades 12 are increased, and the backflow of the airflow S can be prevented. Therefore, the blowing efficiency of the blower 1 can be improved.

  The cover 2 a of the housing 2 has a bell mouth 31 that extends downward at the air inlet 3. And the inner periphery of the bellmouth 31 is located facing the outer peripheral end side of the inner peripheral part 12a of the blade 12. Thereby, even if the airflow S sucked from between the adjacent inner peripheral portions 12a spreads in the circumferential direction between the adjacent inner peripheral portions 12a, the air is rectified downward by the bell mouth 31. Therefore, the airflow S sucked from between the adjacent inner peripheral portions 12a can smoothly circulate toward the gap A2 that connects the outer peripheral surfaces of the adjacent outer peripheral portions 12b in the circumferential direction.

  Further, the distance L1 (see FIG. 5) between the inner peripheral end and the outer peripheral end of the inner peripheral portion 12a is larger than the distance L2 (see FIG. 5) between the inner peripheral end and the outer peripheral end of the outer peripheral portion 12b. Thereby, the area of the blade | wing 12 can be enlarged in the vicinity of the inlet port 3. FIG. Therefore, the air volume of the blower 1 can be increased.

  Moreover, the length L3 (refer FIG. 5) of the connection member 13 in the direction along the outer peripheral part 12b is more than the length L4 (refer FIG. 5) inside radial direction rather than the connection member 13 in the outer peripheral part 12b. Thereby, the airflow S flowing between the outer peripheral portions 12 b of the adjacent blades 12 is suppressed from being diffused upward by the connecting member 13. For this reason, the airflow S can be prevented from flowing back between the blades 12 from above the connecting member 13. Therefore, the blowing efficiency of the blower 1 can be further improved.

  Further, the inner diameter D2 (see FIG. 3) of the connecting member 13 is equal to or larger than the diameter D1 (see FIG. 3) of the intake port 3. Thereby, the collision with the upper surface of the connection member 13 of the airflow S sucked from the intake port 3 can be prevented. Therefore, the air volume sent from the exhaust port 4 can be further increased.

<4. First Modification>
In addition, you may make it the structure from which the connection member 13 of the impeller 10 of the air blower 1 of this embodiment differs. As shown in FIG. 7, the connecting member 13 may be inclined upward (intake port 3 side) as it goes from the outer peripheral end toward the inner peripheral end. Thereby, a flow path can be narrowed so that it may go to the exhaust side between the outer peripheral parts 12b of the adjacent blade | wing 12, and a static pressure can be raised by a nozzle effect. Therefore, the reach of the airflow S can be lengthened, and the air volume can be maintained even if clogging occurs in the air passage 5.

<5. Second Modification>
Moreover, you may make it the structure from which the inner peripheral part 12a of the impeller 10 of the air blower 1 of this embodiment differs. As shown in FIG. 8, the inner peripheral portion 12 a may protrude upward in the axial direction (outward in the axial direction) with respect to the cover portion 2 a of the housing 2 through the air inlet 3. Thereby, the static pressure in the vicinity of the intake port 3 can be increased. Accordingly, the amount of air sent from the blower 1 can be further increased.

  According to the present embodiment, the inner peripheral portion 12a of the blade 12 projects upward from the outer peripheral portion 12b, and the area of the gap A1 that connects the upper surfaces of the adjacent inner peripheral portions 12a in the circumferential direction is the outer peripheral surface of the adjacent outer peripheral portion 12b. It is more than the area of the clearance gap A2 which connects to the circumferential direction. For this reason, the flow path of the air guide | induced between the inner peripheral parts 12a is narrowed between the outer peripheral surfaces of the outer peripheral part 12b. Thereby, the wind pressure and the air volume of the airflow S flowing between the adjacent blades 12 are increased, and the backflow of the airflow S can be prevented. Therefore, the blowing efficiency of the blower 1 can be improved.

  Further, the distance L1 between the inner peripheral end and the outer peripheral end of the inner peripheral portion 12a is larger than the distance L2 between the inner peripheral end and the outer peripheral end of the outer peripheral portion 12b. Thereby, the area of the blade | wing 12 in the vicinity of the inlet port 3 can be enlarged. Therefore, the air volume sent out by the blower 1 can be increased.

  Moreover, the length L3 of the direction along the outer peripheral part 12b in the connection member 13 is more than the length L4 inside radial direction rather than the connection member 13 in the outer peripheral part 12b. Thereby, the airflow S flowing between the outer peripheral portions 12 b of the adjacent blades 12 is suppressed from being diffused upward by the connecting member 13. For this reason, the airflow S can be prevented from flowing back between the blades 12 from above the connecting member 13. Therefore, the blowing efficiency of the blower 1 can be further improved.

  Further, the inner diameter D2 of the connecting member 13 is equal to or larger than the diameter D1 of the intake port 3. Thereby, the collision with the upper surface of the connection member 13 of the airflow S sucked from the intake port 3 can be prevented. Therefore, the air volume sent from the exhaust port 4 can be further increased.

  Further, the inner diameter D2 of the connecting member 13 is equal to or larger than the outer diameter D3 of the base plate 11. Thereby, when forming the impeller 10 which has the blade | wing 12 straddling the baseplate 11 and the connection member 13, the mutual interference of an up-and-down metal mold | die can be prevented. Therefore, it is possible to easily remove the molds on the upper side in the axial direction and the lower side in the axial direction. As a result, the impeller 10 can be integrally formed with a mold, and the mass productivity of the blower 1 can be improved.

  The housing 2 has a bell mouth 31 that extends downward (exhaust side) at the air inlet 3, and the inner peripheral portion 12 a projects into the bell mouth 31. Thereby, air can be rectified and smoothly taken into the housing 2. Further, since the blade 12 has an inner peripheral portion 12a that protrudes upward (intake side) from the outer peripheral portion 12b, even if the bell mouth 31 is provided, the area of the blade 12 is increased in the vicinity of the intake port 3, and the amount of air taken in is increased. can do.

  Further, since a plurality of exhaust ports 4 are provided, the blower 1 that sends out air in a plurality of directions while securing the air volume can be easily realized.

  The connecting member 13 may be inclined upward as it goes from the outer peripheral end to the inner peripheral end. Thereby, the flow path of the airflow S is narrowed toward the exhaust side between the adjacent blades 12, and the static pressure can be increased by the nozzle effect. Therefore, the reach of the airflow S can be lengthened, and the air volume can be maintained even if clogging occurs in the air passage 5.

  Further, the inner peripheral portion 12 a may protrude outward in the axial direction from the housing 2 through the air inlet 3. Thereby, the static pressure in the vicinity of the intake port 3 can be increased. Therefore, the air volume of the blower 1 can be increased.

  According to this invention, it can utilize for an air blower.

  DESCRIPTION OF SYMBOLS 1 ... Blower, 2 ... Housing, 2a ... Cover part, 2b ... Storage part, 3 ... Intake port, 4 ... Exhaust port, 5 ... Air passage, 10. .... Impeller, 11 ... Base plate, 11a ... Projection, 11b ... Through hole, 12 ... Blade, 12a ... Inner circumference, 12b ... Outer circumference, 13 ... Connection Member, 31 ... bell mouth, 50 ... motor, 50a ... shaft, A1 ... gap, A2 ... gap, L1 ... distance, L2 ... distance, L3 ... Distance, L4 ... Distance, L5 ... Distance, L6 ... Distance, D1 ... Diameter, D2 ... Inner diameter, D3 ... Outer diameter, C ... Center axis, S ... air flow

Claims (9)

A blower,
An impeller rotating around a central axis extending vertically;
A housing for housing the impeller;
Have
The impeller includes a base plate, and a plurality of blades arranged on the base plate at a predetermined interval in the circumferential direction,
The upper surface of the housing covers the top of the impeller and is provided with an air inlet that penetrates in the axial direction.
The peripheral surface of the housing covers the periphery of the impeller and is provided with an exhaust port penetrating in the radial direction.
The blade is
An outer periphery,
An inner periphery disposed radially inward of the outer periphery; and
Have
The inner peripheral portion projects upward from the outer peripheral portion,
The blower in which an area of a gap that connects the upper surfaces of the adjacent inner peripheral portions in the circumferential direction is equal to or greater than an area of a gap that connects the outer peripheral surfaces of the adjacent outer peripheral portions in the circumferential direction.   The blower according to claim 1, wherein a distance between an inner peripheral end and an outer peripheral end of the inner peripheral portion is larger than a distance between an inner peripheral end and the outer peripheral end of the outer peripheral portion. The impeller further includes an annular connecting member that is connected to at least a part of the upper surface of the adjacent outer peripheral portion,
The connecting member is disposed on a radially outer side on the outer peripheral portion,
3. The blower according to claim 1, wherein a length of the connecting member in a direction along the outer peripheral portion is equal to or longer than a length of the outer peripheral portion on the radially inner side than the connecting member. .   The blower according to claim 3, wherein an inner diameter of the connecting member is equal to or larger than a diameter of the intake port.   The blower according to claim 3 or 4, wherein the connecting member is inclined upward as it goes from the outer peripheral end toward the inner peripheral end.   The blower according to any one of claims 3 to 5, wherein an inner diameter of the connecting member is equal to or larger than an outer diameter of the base plate. The housing has a bell mouth extending downward at the air inlet,
The blower according to any one of claims 1 to 6, wherein the inner peripheral portion projects into the bell mouth.   The blower according to claim 7, wherein the inner peripheral portion protrudes axially outward from the housing through the intake port.   The blower according to any one of claims 1 to 8, wherein a plurality of the exhaust ports are provided.

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