JP2016151173A - Stator blade unit and blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator blade unit and a blower capable of changing a degree of dispersion or convergence of air flow while restricting a loss of air flow generated from an axial flow fan.SOLUTION: A stationary blade unit 50 is installed in front of an axial flow fan. The stationary blade unit has a plurality of rectifying flow blades 51 extending from a location near a rotating axis toward a radial outer direction and a changing-over mechanism 52 for changing-over positions of the rectifying flow blades. The changing-over mechanism changes over relative positions of the peripheral outer ends of the rectifying blades in respect to their inner ends and a depression angle of the rectifying flow blade in respect to a plane crossing at a right angle with the rotating axis by more than two stages. Upon abutment of direct advance component and swirl component of air stream generated from the axial flow fan against each of the rectifying blades, the direct advance component and swirl component of air stream change their orientations in response to attitudes of the rectifying blades. Due to this fact, a degree of dispersion or convergence of air flow can be changed by changing over relative positions of the peripheral outer ends of the rectifying blades in respect to their inner ends and the depression angle of the rectifying blades in respect to a plane crossing at a right angle with the rotating axis.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stationary blade unit and a blower.

  Conventionally, axial fans have been used for fans such as fans and circulators. The axial fan generates an air flow in a direction substantially parallel to the rotation shaft of the motor by rotating the impeller with a driving force from the motor. In these blowers, there are cases where it is desired to concentrate the wind in a specific direction, or to deliver the wind far away, and to diffuse the wind over a wide range, depending on the situation during use. For this reason, a structure for converging or diffusing the wind generated from the axial fan has been conventionally proposed.

A conventional blower is described in, for example, Japanese Utility Model Publication No. 1-11994. In the blower of the publication, a plurality of blades for adjusting the airflow are provided in front of the fan motor. Then, by rotating or horizontally moving the wind direction adjusting ring, the direction of each blade is changed to switch between diffused air blowing and air blowing in a specific direction.
Japanese Utility Model Publication No. 1-11994

  However, in the structure of Japanese Utility Model Publication No. 1-11994, the position of the blade is centered on the axis connecting the inner end portion and the outer end portion of each blade without changing the position of the inner end portion and the outer end portion of each blade. The air flow generated from the fan motor is adjusted by changing the angle. For this reason, depending on the angle of the blade, the loss of airflow may increase.

  The objective of this invention is providing the stationary blade unit and air blower which can change the spreading | diffusion or convergence degree of an airflow, suppressing the loss of the airflow which arises from an axial fan.

  An exemplary first invention of the present application is a stationary blade unit that is arranged substantially coaxially with a rotating shaft of an axial fan and adjusts an airflow generated from the axial fan, and is radially outward from the vicinity of the rotating shaft. A plurality of rectifying blades extending to and a switching mechanism for switching the positions of the plurality of rectifying blades, the switching mechanism including a relative position in the circumferential direction of an outer end portion with respect to an inner end portion of the rectifying blades, and The elevation angle of the rectifying blade with respect to a plane orthogonal to the rotation axis is switched between two or more stages.

  According to the first exemplary invention of the present application, the straight component and the swirl component of the airflow generated from the axial fan hit each rectifying blade of the stationary blade unit and change the direction. Thereby, the degree of air flow diffusion or convergence can be changed by switching the relative position in the circumferential direction of the outer end with respect to the inner end of the rectifying blade and the elevation angle with respect to the plane orthogonal to the rotation axis.

FIG. 1 is a side view of the electric fan. FIG. 2 is a perspective view of the stationary blade unit in the spot mode. FIG. 3 is a side view of the stationary blade unit in the spot mode. FIG. 4 is a front view of the stationary blade unit in the spot mode. FIG. 5 is a perspective view of the stationary blade unit in the wide mode. FIG. 6 is a side view of the stationary blade unit in the wide mode. FIG. 7 is a front view of the stationary blade unit in the wide mode. FIG. 8 is a perspective view of the switching mechanism. FIG. 9 is an exploded perspective view of the switching mechanism. FIG. 10 is a cross-sectional view of the connecting portion. FIG. 11 is a rear view of the switching mechanism in the spot mode. FIG. 12 is a rear view of the switching mechanism in the semi-spot mode. FIG. 13 is a rear view of the switching mechanism in the semi-wide mode. FIG. 14 is a rear view of the switching mechanism in the wide mode. FIG. 15 is an exploded perspective view of a switching mechanism according to a modification.

  Below, the example of an air blower and a stationary blade unit is disclosed. In the present disclosure, the direction parallel to the rotational axis of the axial fan is referred to as “axial direction”, the direction orthogonal to the rotational axis of the axial fan is defined as “radial direction”, and the arc is centered on the rotational axis of the axial fan. The direction along is called “circumferential direction”. Further, in the present disclosure, the shape and positional relationship of each part will be described with the axial direction being the front-rear direction and the stationary blade unit side in front of the axial fan. However, the definition of the front-rear direction is not intended to limit the installation direction when the blower and the stationary blade unit are used.

<1. Overall configuration of electric fan>
FIG. 1 is a side view of the electric fan 1 including the stationary blade unit 50. The electric fan 1 is a blower that rotates the impeller 40 with the power of the motor 10 and sends the wind forward in the axial direction. The electric fan 1 is placed, for example, on the floor of a home and used for the user to cool. As shown in FIG. 1, the electric fan 1 includes a motor 10, a motor cover 20, a leg 30, an impeller 40, a stationary blade unit 50, and a guard 60. In FIG. 1, in order to clearly show the impeller 40 and the stationary blade unit 50, the guard 60 is shown in a broken state.

  The motor 10 is a power source that supplies power for rotation to the impeller 40. The motor 10 is accommodated in a motor cover 20 that is a housing. The motor 10 includes a shaft 11 that extends forward in the axial direction along the rotation shaft 9. The front end portion of the shaft 11 protrudes forward in the axial direction from the front surface of the motor cover 20. When a drive current is supplied to the motor 10, torque about the rotation shaft 9 is generated by the magnetic force between the coil and the magnet disposed in the motor 10. As a result, the shaft 11 of the motor 10 rotates about the rotation shaft 9. A solid arrow R <b> 0 in FIG. 1 indicates the rotation direction of the shaft 11.

  For example, a brushless DC motor is used as the motor 10. A brushless DC motor has a longer life than a motor with a brush because there is no performance deterioration due to wear of the brush. In addition, the brushless DC motor is easier to perform shift control than the AC motor and consumes less power. However, instead of the brushless DC motor, a motor with a brush or an AC motor may be used.

  The leg portion 30 has a base portion 31 and a support column 32. The base portion 31 extends substantially horizontally below the motor cover 20. When the electric fan 1 is used, the lower surface of the base portion 31 is in contact with the floor surface. The support column 32 extends upward from the upper surface of the base portion 31, and its upper end portion is connected to the motor cover 20. Accordingly, the motor 10 and the motor cover 20 are supported at a certain height position from the floor surface.

  The impeller 40 is a member that generates an airflow directed forward in the axial direction by rotating about the rotation shaft 9. The impeller 40 is disposed in front of the motor cover 20 in the axial direction. As shown in FIG. 1, the impeller 40 includes a cup portion 41 located at the center and a plurality of rotating blades 42 extending radially outward from the cup portion 41. The cup portion 41 is fixed to the front end portion of the shaft 11 of the motor 10. The plurality of rotating blades 42 are arranged in the circumferential direction on the radially outer side of the cup portion 41. Each rotary blade 42 spreads obliquely with respect to the axial direction and the circumferential direction. The edge on the leading side in the rotational direction of each rotary blade 42 is positioned rearward in the axial direction from the edge on the tail side in the rotational direction.

  When the motor 10 is driven, the shaft 11 of the motor 10 and the impeller 40 fixed to the shaft 11 rotate about the rotation shaft 9 in the same direction as the rotation direction R0 of the shaft 11. If it does so, gas will be accelerated by the some rotary blade 42, and the airflow which goes to an axial front from the axial back is produced in the circumference | surroundings of the impeller 40. FIG. That is, in the electric fan 1, the motor 10 and the impeller 40 constitute an axial fan 70 that generates an airflow that is directed forward in the axial direction.

  The impeller 40 is a single resin member obtained by injection molding, for example. However, the impeller 40 may be composed of a plurality of members. For example, the cup part 41 and the plurality of rotary blades 42 may be separate members. The impeller 40 may be made of a material other than resin.

  The stationary blade unit 50 is a mechanism for adjusting the airflow generated from the impeller 40. The stationary blade unit 50 is positioned in front of the axial fan 70 in the axial direction, and is disposed substantially coaxially with the rotary shaft 9 of the axial fan 70. The stationary blade unit 50 is separated from the shaft 11 and the impeller 40. Therefore, even when the shaft 11 and the impeller 40 are rotated, the stationary blade unit 50 is stationary without rotating. As shown in FIG. 1, the stationary blade unit 50 includes a plurality of rectifying blades 51 and a switching mechanism 52 that switches the positions of the rectifying blades 51.

  The user of the electric fan 1 can adjust the degree of convergence or diffusion of the airflow generated from the impeller 40 by operating the switching mechanism 52 and switching the positions of the plurality of rectifying blades 51. Hereinafter, the state in which the airflow generated from the impeller 40 is converged as compared with the case where there is no stationary blade unit 50 is referred to as “spot mode”. In the spot mode, a strong wind can be sent intensively to the user located in the axial direction of the electric fan 1. Further, the state in which the airflow generated from the impeller 40 is diffused more than in the case where there is no stationary blade unit 50 is hereinafter referred to as “wide mode”. In the wide mode, a gentle wind can be sent to a plurality of users located in a wide range.

  The guard 60 is a bowl-shaped frame that houses the impeller 40 and the stationary blade unit 50 therein. The guard 60 prevents the user from contacting the rotating impeller 40 while allowing the airflow generated by the impeller 40 to pass therethrough. As shown in FIG. 1, the guard 60 has an outer ring 61, a plurality of front spokes 62, and a plurality of rear spokes 63. The outer ring 61, the plurality of front spokes 62, and the plurality of rear spokes 63 are each made of a metal such as iron. However, the surface of these members may be covered with a resin thin film.

  The outer peripheral ring 61 surrounds the radially outer side of the impeller 40 in an annular shape. The plurality of front spokes 62 spread radially in front of the stationary blade unit 50 in the axial direction. The radially outer end of each front spoke 62 is fixed to the outer ring 61. In addition, the radially inner end of each front spoke 62 is fixed to the switching mechanism 52 of the stationary blade unit 50. The plurality of rear spokes 63 are radially spread on the rear side in the axial direction of the impeller 40. The radially outer end of each rear spoke 63 is fixed to the outer ring 61. Further, the radially inner end of each front spoke 62 is fixed to the motor cover 20.

<2. About the stator unit>
Next, a more detailed configuration of the stationary blade unit 50 will be described.

  2 and 5 are perspective views of the stationary blade unit 50. FIG. 3 and 6 are side views of the stationary blade unit 50. FIG. 4 and 7 are front views of the stationary blade unit 50. FIG. The airflow generated from the impeller 40 moves forward in the axial direction as a whole, as indicated by a broken-line arrow F1 in FIGS. However, the airflow has a swirl component that swirls in the same direction as the rotation direction R0 of the impeller 40, as indicated by a dashed arrow F2 in FIGS.

  As described above, the stationary blade unit 50 includes the plurality of rectifying blades 51 and the switching mechanism 52 that switches the positions of the rectifying blades 51.

  The plurality of rectifying blades 51 are arranged at substantially equal intervals in the circumferential direction around the switching mechanism 52. Each rectifying blade 51 is formed to extend radially outward from the vicinity of the rotating shaft 9. The shape of each rectifying blade 51 may be linear or arcuate. In the example of FIGS. 2 to 7, each rectifying blade 51 extends linearly outward in the radial direction.

  In addition, when the front spoke 62 of the guard 60 is inclined, the end edge on the front spoke 62 side of each rectifying blade 51 may be inclined along the inclination of the front spoke 62. For example, when the front spokes 62 are inclined so as to be displaced rearward in the axial direction as going outward in the radial direction, the end edges on the front spokes 62 side of the respective rectifying blades 51 are also axially extended toward the outer side in the radial direction. You may incline so that it may be displaced to the back side. In this way, the stationary blade unit 50 can be arranged by effectively using the space inside the guard 60. Therefore, the fan 1 can be saved in the axial direction.

  The switching mechanism 52 has a relative position (hereinafter referred to as a phase angle) of an outer end portion with respect to an inner end portion of the rectifying blade 51 and an inclination (hereinafter referred to as an elevation angle) with respect to a plane perpendicular to the rotation axis 9 of the rectifying blade 51. Are simultaneously switched. Thereby, the position of the rectifying blade 51 is switched in multiple stages between the spot mode and the wide mode.

  2 to 4 show the stationary blade unit 50 in the spot mode. As shown in FIGS. 2 to 4, in the spot mode, the postures of the plurality of rectifying blades 51 are almost parallel to the axial direction. For this reason, in the spot mode, the straight component of the airflow generated from the impeller 40 is sent forward in the axial direction as indicated by the broken arrow F3 in FIG. Further, as shown in FIG. 4, the relative position in the circumferential direction of the outer end portion with respect to the inner end portion of the rectifying blade 51 is located in the direction opposite to the rotation direction R <b> 0 of the impeller 40. For this reason, when the swirl component of the airflow generated from the impeller 40 hits the rectifying blade 51, the flow direction changes radially inward as shown by the broken line arrow F4 in FIG.

  Therefore, in the spot mode, a straight traveling component is added to the swirl component of the airflow that has converged in the vicinity of the rotating shaft 9, and a strong wind can be sent intensively to the user positioned in the axial direction of the fan 1. Moreover, the airflow generated from the impeller 40 can be sent farther in the axial direction.

  5 to 7 show the stationary blade unit 50 in the wide mode. As shown in FIGS. 5 to 7, in the wide mode, the postures of the plurality of rectifying blades 51 are almost perpendicular to the axial direction. For this reason, in the wide mode, the straight traveling component of the airflow generated from the impeller 40 is diffused by the rectifying blades 51 and sent outward in the radial direction as indicated by the broken line arrow F5 in FIG. Further, as shown in FIG. 7, the circumferential relative position of the outer end portion with respect to the inner end portion of the rectifying blade 51 is located in the same direction as the rotation direction R <b> 0 of the impeller 40. For this reason, when the swirl component of the airflow generated from the impeller 40 hits the rectifying blade 51, the flow direction is changed radially outward as indicated by the broken arrow F6 in FIG.

  Therefore, in the wide mode, both the straight component and the diffusion component of the airflow generated from the impeller 40 are diffused, and a gentle wind can be given to a plurality of users located in a wide range in the axial direction of the fan 1. .

  As described above, in the electric fan 1, the linearly moving component and the swirling component of the airflow generated from the axial fan 70 strike the rectifying blades 51 of the stationary blade unit 50 to change the direction. Therefore, the degree of airflow diffusion or convergence can be changed by switching the phase angle and elevation angle of the rectifying blade 51.

  The plurality of rectifying blades 51 have a curved notch 51B at the radially inner end. Thereby, the wind near the inner ends of the plurality of rectifying blades 51 can easily pass forward in the axial direction. Therefore, the air volume near the rotating shaft 9 can be increased. As shown in FIG. 2, the notch 51 </ b> B is preferably located at the radially inner end of the rectifying blade 51 and on the front side in the axial direction of the rectifying blade 51 in the spot mode. Thereby, also in the spot mode, the distance between the rectifying blade 51 and the impeller 40 is kept constant, and the airflow generated from the impeller 40 can be uniformly applied to the rectifying blade 51.

  2, 3, 5, and 6, each of the plurality of rectifying blades 51 has a plurality of projections 51A on the surface on the impeller 40 side. The plurality of protrusions 51 </ b> A form a fine turbulent flow in a part of the airflow generated from the impeller 40, and can suppress a large wind separation due to the wind deviating from the rectifying blades 51. Thereby, the wind noise due to the separation of the wind is suppressed, and the noise during the blowing can be reduced. In the examples of FIGS. 2, 3, 5, and 6, protrusions 51 </ b> A are provided in the vicinity of the outer end portion and the inner end portion along the edge on the axially front side of each rectifying blade 51. Yes. However, similar protrusions 51 </ b> A may be provided at other positions of the rectifying blades 51.

<3. About switching mechanism>
Next, a more detailed configuration of the switching mechanism 52 will be described.

  The switching mechanism 52 is a mechanism that supports the plurality of rectifying blades 51 and switches the phase angle and the elevation angle of each rectifying blade 51 in multiple stages. 8 and 9 are diagrams schematically showing the configuration of the switching mechanism 52. In FIG. 8 and subsequent figures, only one rectifying blade 51 is drawn to clearly show the switching mechanism 52, but actually one or two or more rectifying blades are added to a single switching mechanism 52. 51 are connected.

  As shown in FIGS. 8 and 9, the switching mechanism 52 has a fixed base 521 and a movable ring 522. The movable ring 522 is connected to the fixed base 521 so as to be rotatable about the rotation shaft 9. The fixed base 521 and the movable ring 522 are each provided with a retaining portion. Hereinafter, the retaining portion provided in the fixed base 521 is referred to as a first retaining portion 531, and the retaining portion provided in the movable ring 522 is referred to as a second retaining portion 532.

  The rectifying blade 51 is provided with a connecting portion 540. The connecting portion 540 has a stopper portion corresponding to each of the first retaining portion 531 and the second retaining portion 532. In the example of FIGS. 8 and 9, the pair of stop portions of the connecting portion 540 are arranged in a direction different from the direction in which the inner end portion of the rectifying blade 51 extends. The connecting portion 540 may be integrally molded with the rectifying blade 51 or may be attached to the rectifying blade 51 as a separate member. Hereinafter, the stopper part corresponding to the first stopper part 531 is referred to as a first stopper part 541, and the stopper part corresponding to the second stopper part 532 is referred to as a second stopper part 542.

  The second stopper 542 is a cylindrical space extending in the axial direction so that the second stopper 532 can slide in the axial direction. On the other hand, in the first stop receiving portion 541, sliding of the first retaining portion 531 in the axial direction is restricted. Thus, in this example, the shape of the first stopper portion 541 and the shape of the second stopper portion 542 are different from each other.

  FIG. 10 is a cross-sectional view of the connecting portion 540 in a state where the retaining portion is inserted into the retaining portion. As shown in FIG. 10, the retaining portion has a spherical retaining tip 53A and a retaining shaft 53B extending from the retaining tip 53A toward the rotary shaft 9 side. The removal leading end portion 53A is held in a rotatable state within the stop receiving portion. In addition, an opening 543 is provided in each of the first stopper part 541 and the second stopper part 542 in the radial direction. The retaining shaft portion 53 </ b> B can rotate together with the retaining tip portion 53 </ b> A within the range of the opening 543.

  In the example of FIG. 10, the shape of the retaining front end portion 53A is spherical, but other shapes may be employed as long as the retaining front end portion 53A is rotatable within the retaining portion. For example, the retaining tip 53A may be hemispherical or polyhedral. However, it is preferable that either the outer surface of the retaining tip 53A or the inner surface of the retaining portion is spherical.

  When the user grips the movable ring 522 that is an operation member and rotates it in the radial direction, the first retaining portion 531 rotates inside the first retaining portion 541, and the first retaining portion 531 and the first retaining portion are rotated. The inner end of the rectifying blade 51 is displaced in the circumferential direction with the connection point with the portion 541 as a fulcrum. At the same time, the second retaining portion 532 slides along the cylindrical space of the second retaining portion 542 while the second retaining portion 532 rotates inside the second retaining portion 542. Thereby, the baffle blade 51 and the connection part 540 incline, maintaining a relative angle. If it does so, the attitude | position of each baffle blade 51 will change according to the inclination of a radial direction inner end part. As a result, the phase angle and elevation angle of the rectifying blade 51 are switched simultaneously.

  11 to 14 are rear views of the switching mechanism 52. FIGS. 11 to 14 show a state in which the spot mode is changed to the wide mode by rotating the movable ring 522. As shown in FIG. 11, in the spot mode, the rectifying blades 51 are substantially parallel to the axial direction. When the movable ring 522 is rotated, as shown in FIGS. 11 to 14, the phase angle and the elevation angle of the rectifying blade 51 are switched in stages. Thus, the plurality of rectifying blades 51 can be switched to the spot mode of FIG. 11, the semi-spot mode of FIG. 12, the semi-wide mode of FIG. 13, and the wide mode of FIG. Therefore, the degree of diffusion or convergence of the airflow generated from the electric fan 1 can be adjusted to a desired state according to the use situation. If the number of stages that can be switched by the switching mechanism 52 is increased, the degree of airflow diffusion or convergence can be adjusted more finely. The switching mechanism 52 may switch the positions of the plurality of rectifying blades 51 steplessly, that is, continuously.

<4. Modification>
As mentioned above, although exemplary embodiment of this invention was described, this invention is not limited to said embodiment.

  FIG. 15 shows an example of the switching mechanism 52 in the case where the fixed base 521 and the movable ring 522 are provided with screw threads or screw grooves 52A and 52B, respectively. The screw threads or screw grooves 52 </ b> A and 52 </ b> B each extend spirally around the rotation axis 9. Further, the screw thread or screw groove 52A of the fixed base 521 and the screw thread or screw groove 52B of the movable ring 522 are in contact with each other.

  When the movable ring 522 is rotated in the circumferential direction, the movable ring 522 moves in the axial direction with respect to the fixed base 521 in accordance with the thread or the groove 52A, 52B. Then, the inner end of the rectifying blade 51 is displaced in the circumferential direction with the connection point between the first retaining portion 531 and the first retaining portion 54A as a fulcrum. At the same time, the movable ring 522 moves in the axial direction with respect to the fixed base 521. Thereby, the connection point between the second retaining portion 532 and the second retaining portion 54B serves as a fulcrum, and the rectifying blade 51 and the coupling portion 540 are inclined while maintaining a relative angle. As a result, the phase angle and elevation angle of the rectifying blade 51 are switched simultaneously. In this case, since the movable ring 522 moves in the axial direction by the thread and the thread grooves 52A and 52B, the second retaining portion 532 does not need to slide in the second retaining portion 54B. Therefore, you may make the 1st stop part 54A and the 2nd stop part 54B into the same shape.

  Further, at least in the wide mode, the rectifying blade 51 may be inclined so that the surface on the impeller 40 side is separated from the impeller 40 toward the radially outer side. If it does so, the airflow which arises from the impeller 40 can be more efficiently diffused to radial direction outer side.

  In the above-described embodiment, the fixed base 521 and the movable ring 522 have a retaining portion, and the connecting portion 540 has a retaining portion. However, the connecting portion 540 may have a retaining portion, and the fixed base portion 521 and the movable ring 522 may have a retaining portion.

  Moreover, in said embodiment, the stationary blade unit 50 was arrange | positioned inside the guard 60 of the electric fan 1. As shown in FIG. However, the stationary blade unit of the present invention may be disposed outside the guard. Further, the stationary blade unit may be an accessory that can be attached to and detached from the electric fan main body, or may be sold separately from the electric fan main body.

  Moreover, in said embodiment, although what was called the swing function of the electric fan 1 was not mentioned, the air blower of this invention may have a swing function. If the swing function is further used while the stationary blade unit is switched to the wide mode, the wind generated from the impeller can be sent over a wider range.

  In the above embodiment, the example in which the stationary blade unit 50 is mounted on the electric fan 1 has been described. However, the blower on which the stationary blade unit of the present invention is mounted is not necessarily a fan for cooling purposes. May be. For example, the stationary blade unit of the present invention may be mounted on a blower such as a circulator intended to stir indoor air or a dryer intended to dry hair.

  Moreover, the shape of the detail of each member which comprises a stationary blade unit and an air blower may differ from the shape shown by each figure of this application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

  The present invention can be used for a stationary blade unit and a blower.

DESCRIPTION OF SYMBOLS 1 Fan 9 Rotating shaft 10 Motor 11 Shaft 20 Motor cover 30 Leg part 31 Base part 32 Support | pillar 40 Impeller 41 Cup part 42 Rotary blade 50 Stator blade unit 51 Rectification blade 52 Switching mechanism 60 Guard 61 Outer ring 62 Front spoke 63 Rear spoke 70 Axial fan 51A Protrusion 51B Notch 521 Fixed base 522 Movable ring 531 First retaining portion 532 Second retaining portion 53A Retaining tip portion 53B Retaining shaft portion 540 Connecting portion 541, 54A First retaining portion 542, 54B Second retaining portion Part 52A, 52B Thread or groove

Claims (11)

A stationary blade unit that is arranged substantially coaxially with the rotational axis of the axial fan and adjusts the airflow generated from the axial fan,
A plurality of rectifying blades extending radially outward from the vicinity of the rotating shaft;
A switching mechanism for switching the positions of the plurality of rectifying blades;
Have
The switching mechanism is a stationary blade unit that switches a relative position in a circumferential direction of an outer end portion with respect to an inner end portion of the rectifying blade and an elevation angle of the rectifying blade with respect to a plane orthogonal to the rotation axis in two or more stages. The stator blade unit according to claim 1, wherein
The switching mechanism has a single operation member to which the plurality of rectifying blades are coupled,
A stationary blade unit in which a relative position in a circumferential direction of an outer end portion with respect to an inner end portion of the rectifying blade and an elevation angle of the rectifying blade with respect to a plane orthogonal to the rotation axis are switched simultaneously by operation of the operation member. In the stator blade unit according to claim 1 or 2,
The switching mechanism is
A fixed base;
A movable ring coupled to the fixed base so as to be rotatable about the rotation axis;
A connecting portion of the rectifying blade;
Have
Either one of the fixed base and the connecting portion has a first retaining portion,
The other of the fixed base portion and the connecting portion has a first stopper portion that rotatably holds the first stopper portion,
Either one of the movable ring and the connecting portion has a second retaining portion disposed in the axially forward direction or the axially rearward direction of the first retaining portion,
The other of the movable ring and the connecting part has a second stopper part for rotatably holding the second stopper part,
A stationary blade unit in which the relative position in the circumferential direction of the outer end portion with respect to the inner end portion of the flow straightening blade and the elevation angle of the flow straightening blade with respect to a plane orthogonal to the rotation axis are simultaneously switched by rotating the movable ring. . The stationary blade unit according to claim 3,
The shape of the first stopper part is different from the shape of the second stopper part,
When the movable ring is rotated, the first retaining part or the second retaining part slides in the axial direction along with the rotation according to the shape of each of the first retaining part and the second retaining part. Thus, the stationary blade unit in which the relative position in the circumferential direction of the outer end portion with respect to the inner end portion of the rectifying blade and the elevation angle of the rectifying blade with respect to the plane orthogonal to the rotation axis are switched simultaneously. The stationary blade unit according to claim 3,
The fixed base includes a screw thread or a groove that extends spirally around the rotation axis,
The movable ring includes a screw groove that contacts the screw thread or a screw thread that contacts the screw groove,
A stationary blade unit in which the movable ring moves in the axial direction with respect to the fixed base by rotating the movable ring. In the stationary blade unit according to any one of claims 3 to 5,
The outer surface of the first retaining portion or the inner surface of the first retaining portion is spherical.
The outer surface of the second retaining portion or the inner surface of the second retaining portion is a stationary blade unit having a spherical shape. In the stationary blade unit according to any one of claims 1 to 6,
Each of the plurality of rectifying blades is a stationary blade unit having a notch at a radially inner end. The stator blade unit according to any one of claims 1 to 7,
Each of the plurality of rectifying blades is a stationary blade unit having a plurality of protrusions on a surface on the axial fan side. An impeller that rotates about the rotation axis;
A motor for rotating the impeller;
And an axial fan that generates an airflow directed forward in the axial direction,
The stationary blade unit according to any one of claims 1 to 8, which is disposed in front of the impeller in the axial direction.
With blower. The blower according to claim 9, wherein
The switching mechanism is
Rather than the case where there is no stationary blade unit, spot mode to converge the airflow generated from the impeller,
Compared to the case where there is no stationary blade unit, a wide mode for diffusing the airflow generated from the impeller, and
A blower for switching the position of the rectifying blades. The blower according to claim 10, wherein
At least in the wide mode, the blower in which the impeller side surface of each of the plurality of rectifying blades is inclined so as to be separated from the impeller as it goes radially outward.

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