JP6483748B2 - Blower - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a blower installed on a ceiling surface in a room to circulate air.

  A conventional blower installed on a ceiling surface of a room to circulate the air in the room is disclosed in Patent Document 1. In this fan, a motor is fixed to a mounting bracket attached to a ceiling surface, and an impeller is attached to a motor shaft of the motor. The driving of the motor causes the impeller to rotate on the vertical rotation axis, and air circulation in the room is performed.

  In recent years, so-called ceiling lights for indoor lighting and a blower have been integrated, and a blower having a lighting unit around an impeller has been commercialized. The blower has a base attached to the ceiling surface. A power supply substrate is installed in the base portion, and a motor of an electric fan is attached. An impeller is attached to the motor shaft of the motor.

  The illumination part is formed in a ring shape having a cylindrical hollow part, forms an air communication port with the ceiling surface, and is attached to the base part by a support. The impeller is disposed in the cavity, and the opening at the lower end of the cavity is provided with a fan guard having a plurality of blades. The fan guard prevents contact between the impeller and the foreign matter, and the opening is formed to have an opening ratio corresponding to a desired wind speed.

  In the blower of the above configuration, when the lighting unit is turned on, indoor lighting is performed. When the impeller is rotated in a predetermined positive direction by the drive of the motor, the air supplied to the impeller through the flow port is sent downward from the opening to circulate the air in the room.

JP 2003-269385 A (Pages 2 to 7; FIG. 2)

  However, according to the conventional fan described above, since the illumination unit is disposed around the impeller, the flow path resistance of the air supplied to the impeller from the side becomes large. In addition, the fan guard increases the pressure loss of air. At this time, when the impeller rotates in the forward direction, a backflow phenomenon may occur in which air flows from the opening toward the circulation port. As a result, there has been a problem that air circulation in the room can not be normally performed.

  An object of the present invention is to provide a blower capable of normally performing indoor air circulation by preventing a backflow phenomenon.

In order to achieve the above object, according to the present invention, a base portion attached to a ceiling surface of a room, a motor fixed to the base portion, and a motor rotating on a rotation axis perpendicular to a mounting surface of the base portion An electric fan having an impeller, an annular portion formed in an annular shape having a cylindrical hollow portion in which the impeller is disposed, and an air flow opening between the ceiling surface and the annular portion A fan having a plurality of blades and disposed at a lower end surface of the hollow portion, wherein the fan blows downward when the impeller rotates in a predetermined positive direction,
The upper and lower ends of the impeller are disposed substantially in agreement with the upper and lower surfaces of the annular portion, the radius of the impeller is R, and the upper side of the impeller at a position of R / 2 in the radial direction from the rotation axis The length of the space in the direction perpendicular to the mounting surface is D1, the direction perpendicular to the mounting surface of the space above the impeller on the outer peripheral side than R / 2 in the radial direction from the rotation axis It is characterized in that D1 / R ≧ 0.07 and D2 ≧ D1 are satisfied, where D2 is a length.

  Further, the present invention is characterized in that D3 / R ≦ 0.08 is satisfied in the air blower of the above-described configuration, where a distance between a lower end of the impeller and an upper surface of the fan guard is D3.

  Further, according to the present invention, in the blower of the above configuration, a plurality of the blades are radially disposed, and both end surfaces in the circumferential direction of the blades are formed in a straight line or a curved line curved outward in the positive rotation direction. It is characterized by being

  Further, according to the present invention, in the fan having the above-mentioned configuration, a plurality of the blades are arranged concentrically.

  Further, the present invention is characterized in that, in the blower of the above-mentioned configuration, the annular portion is constituted of an illumination unit for illuminating.

Further, according to the present invention, there is provided an electric motor having a base portion attached to a ceiling surface in a room, a motor fixed to the base portion, and an impeller rotating on a rotation axis perpendicular to the mounting surface of the base portion by the motor. It has an annular part which is annularly formed with a fan, a cylindrical hollow part in which the impeller is disposed, and an air flow opening between the ceiling surface and the plurality of blades. And a fan guard disposed on the lower end surface of the hollow portion, wherein the fan blows downward when the impeller rotates forwardly,
The upper and lower ends of the impeller are arranged to substantially coincide with the upper and lower surfaces of the annular portion, and the radius of the impeller is R, and the distance between the lower end of the impeller and the upper surface of the fan guard is D3. , D3 / R ≦ 0.08 is satisfied.

  According to the present invention, the radius of the impeller is R, the length in the direction perpendicular to the mounting surface of the space above the impeller at the position R / 2 radially from the rotation axis is D1, and the diameter from the rotation axis When a length in a direction perpendicular to the mounting surface of the space above the impeller on the outer peripheral side than R / 2 in the direction is D2, D1 / R ≧ 0.07 and D2 ≧ D1 are satisfied. As a result, a large air volume can be obtained, the backflow phenomenon can be prevented, and the indoor air circulation can be performed normally.

  Further, according to the present invention, D3 / R ≦ 0.08 is satisfied, where the radius of the impeller is R and the distance between the lower end of the impeller and the upper surface of the fan guard is D3. Thereby, the backflow phenomenon can be prevented, and the air circulation in the room can be normally performed.

Front sectional drawing which shows the air blower of 1st Embodiment of this invention Bottom view showing a fan according to a first embodiment of the present invention An exploded perspective view showing a fan according to a first embodiment of the present invention An exploded perspective view showing a base part of a fan of a first embodiment of the present invention The perspective view which shows the motor part of the air blower of 1st Embodiment of this invention Schematic front sectional drawing which shows the other attachment structure of the motor part of the air blower of 1st Embodiment of this invention Schematic front sectional drawing which shows the other attachment structure of the motor part of the air blower of 1st Embodiment of this invention Front sectional view showing a blower according to a second embodiment of the present invention Front sectional drawing which shows the air blower of 3rd Embodiment of this invention The figure which shows the relationship of the space above the impeller of the fan of 1st-3rd embodiment of this invention, and an air volume. The figure which shows the relationship of the space above the impeller of the fan of 1st-3rd embodiment of this invention, and the minimum aperture ratio. The figure which shows the relationship under the clearance below the impeller of the fan of 1st Embodiment of this invention, the minimum aperture ratio, and the air volume. Bottom view showing a blower according to a fourth embodiment of the present invention Bottom view showing a fan according to a fifth embodiment of the present invention The figure which shows the relationship between the distance from the center of the air blower of 4th, 5th embodiment of this invention, and the wind speed. The partial bottom view which shows the principal part of the air blower of 6th Embodiment of this invention AA cross section of FIG. 16 Bottom view showing a blower according to a seventh embodiment of the present invention The partial bottom view which shows the principal part of the air blower of 8th Embodiment of this invention B-B cross-sectional view of FIG. Bottom view showing a fan guard of a blower according to a ninth embodiment of the present invention Front sectional view showing a fan guard of a blower according to a ninth embodiment of the present invention The perspective view which shows the attachment part of the impeller of the air blower of 10th Embodiment of this invention The front view which shows the attachment part of the impeller of the air blower of 10th Embodiment of this invention Side view showing a mounting portion of an impeller of a blower according to a tenth embodiment of the present invention The front view which shows the state at the time of attachment of the attaching part of the impeller of the air blower of 11th Embodiment of this invention. The perspective view which looked at the attaching part of the impeller of the air blower of 11th Embodiment of this invention from the downward direction The perspective view which looked at the attaching part of the impeller of the air blower of 11th Embodiment of this invention from upper direction An exploded perspective view of a mounting portion of an impeller of a blower according to an eleventh embodiment of the present invention Front sectional drawing of the attaching part of the impeller of the air blower of 11th Embodiment of this invention Front sectional view showing a fan according to a twelfth embodiment of the present invention Front sectional drawing which shows the room at the time of the downward blowing by the air blower of 12th Embodiment of this invention The figure which shows an example of the relationship between the installation function at the time of the downward blowing by the air blower of 12th Embodiment of this invention, and a room temperature difference. Front sectional drawing which shows the room at the time of the upper blowing by the air blower of 12th Embodiment of this invention Front sectional drawing which shows the room at the time of horizontal blowing by the air blower of 12th Embodiment of this invention Front sectional drawing which shows the air blower of 13th Embodiment of this invention Front sectional drawing which shows the air blower of 14th Embodiment of this invention Front sectional view showing a fan according to a fifteenth embodiment of the present invention A front sectional view showing a blower of a sixteenth embodiment of the present invention

First Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG.1, FIG.2, FIG.3 has shown front sectional drawing, the bottom view, and the disassembled perspective view of the air blower of 1st Embodiment. The blower 1 has a base portion 2 attached to the ceiling surface L via an attachment member 2a. For example, general hook sealing is used for the mounting member 2a. The base unit 2 is internally provided with a power supply substrate and a drive substrate for the illumination unit 5 and the electric fan 10 described later, and is covered with a truncated cone base cover 2b to form an outer peripheral portion on an inclined surface.

  An electric fan 10 is attached to the lower surface of the central portion of the base portion 2. The electric fan 10 is formed by an axial flow fan, and has a motor unit 11 and an impeller 20 for mounting the motor 12 (see FIG. 5). The impeller 20 is provided with a plurality of blades on the outer peripheral surface of the central boss 20a. The impeller 20 has the boss 20a inserted into the motor shaft 12a of the motor 12, and the fixing screw 21 is screwed to a screw formed on the motor shaft 12a. The fixing screw 21 is formed in a reverse screw with respect to the rotation direction (arrow G) of the impeller 20 described later.

  Thus, a space 6 in which air flows between the lower surface of the base portion 2 and the upper end of the impeller 20 is formed above the impeller 20. The impeller 20 rotates in the positive direction clockwise as viewed from the lower surface as shown by the arrow G around the rotation axis C perpendicular to the mounting surface (ceiling surface L) of the base 2 by the drive of the motor 12 and moves downward. Send out the air flow. The radius R of the impeller 20 is desirably about 160 mm, and the blade cross-section height of the impeller 20 is desirably about 50 mm.

  A plurality of columns 3 extend around the periphery of the base 2, and an air flow port 3 a is formed between the columns 3 so that the lighting unit 5 is attached to the lower end of the column 3. The illumination unit 5 includes a light source (not shown) such as an LED and is covered by the illumination cover 5a, and forms an annular portion having a tubular hollow portion 5b. The illumination cover 5a is formed of a light transmitting resin or the like, and the lower surface is formed in a polygonal cross-sectional shape of a plane.

  The impeller 20 is disposed in the hollow portion 5 b so that the upper and lower ends thereof substantially coincide with the upper and lower surfaces of the illumination unit 5. By forming the illumination unit 5 in an annular shape and arranging the impeller 20 in the hollow portion 5 b, the blower 1 can be made thinner and lighter, and the design can be improved. The illumination unit 5 may be divided in the circumferential direction and arranged annularly.

  A fan guard 40 having a plurality of blades 41 is provided in the opening 5c at the lower end of the hollow portion 5b. The fan guard 40 prevents contact between the impeller 20 and the foreign matter, and forms the opening 5 c at an opening ratio according to a desired wind speed.

  The blades 41 are radially disposed so as to bridge the ring portion 40a at the outer peripheral end of the fan guard 40 and the circular portion 40b covering the boss portion 20a. Both end surfaces in the circumferential direction of the blade 41 are formed in linear vertical surfaces along a center line perpendicular to the rotation axis C. The radius of the circular portion 40b is, for example, 0.25R, where R is the radius of the impeller 20.

  In the horizontal cross section on the blade 41, the open area ratio of the fan guard 40 is an annular area on the outer peripheral side of the boss 20a of the opening 5c (area of outer peripheral area-shielding of the outer peripheral area by the fan guard 40 It is defined by area / area of the outer peripheral area.

  Further, as shown in FIG. 1, the radius of the impeller 20 is R, and the length in the direction perpendicular to the mounting surface (ceiling surface L) of the space 6 at the position of R / 2 in the radial direction from the rotation axis C D1, the length in the direction perpendicular to the mounting surface (ceiling surface L) of the space 6 on the outer peripheral side than R / 2 in the radial direction from the rotation axis C is D2, the lower end of the impeller 20 and the upper surface of the fan guard 40 And the distance between them is D3. At this time, the base portion 2, the impeller 20 and the fan guard 40 are disposed so as to satisfy the expressions (1), (2) and (3).

D1 / R ≧ 0.07 (1)
D2 D D1 (2)
D3 / R ≦ 0.08 (3)

  Since the peripheral portion of the base portion 2 is formed into an inclined surface, the length D2 increases as it goes to the outer peripheral side, and it is apparent that the formula (2) is satisfied. In FIG. 1, since the length D2 changes depending on the peripheral portion of the base portion 2 formed of the inclined surface, the maximum value (D2max) of the length D2 is described.

  FIG. 4 shows an exploded perspective view of the base unit 2 and the motor unit 11. FIG. 5 is a perspective view of the motor unit 11 as viewed from above. The motor unit 11 incorporates the motor 12 inside the motor cover 13, and a flange portion 13 a having a plurality of duller holes 13 b is formed on the upper surface of the motor cover 13. A damping member (not shown) such as rubber is disposed on the upper surface of the flange portion 13a. On the lower surface of the base portion 2, a plurality of locking bolts 2c inserted in the dharma hole 13b are attached.

  When the motor unit 11 is attached, the lead wire 12 b led from the motor 12 is connected to a terminal (not shown) disposed at a predetermined position of the base unit 2. Next, the locking bolt 2c is inserted into the dharma hole 13b, and the motor unit 11 is rotated around the motor shaft 12a and locked by the locking bolt 2c. Then, the fixing screw 14 penetrating the flange portion 13a is screwed into the lower surface of the base portion 2, and the motor portion 11 is fixed.

  By this, before the motor unit 11 is fixed, it is temporarily fixed by the locking bolt 2c. For this reason, even if the operator releases the hand in the middle of the mounting operation of the motor unit 11, the motor unit 11 can be prevented from falling off. Therefore, the number of assembling steps and dismantling of the blower 1 can be improved.

  The motor unit 11 may be temporarily fixed by the snap lock 15, as shown in the front sectional view of the main part in FIG. That is, the hook portion 15a and the ring portion 15b of the snap lock 15 are provided on the base portion 2 and the flange portion 13a, and the insertion hole 13c of the hook portion 15a is provided on the flange portion 13a. Then, the hook portion 15a is inserted into the insertion hole 13c, and the motor portion 11 is temporarily fixed by the engagement between the hook portion 15a and the ring portion 15b.

  As a result, since the motor unit 11 is not rotated, a decrease in workability due to the friction between the damping member and the base unit 2 can be prevented, and the mountability of the motor unit 11 can be further improved. At this time, when the snap lock 15 has a spring property capable of holding the motor unit 11, the fixing screw 14 may be omitted and the motor unit 11 may be fixed by the snap lock 15.

  Further, as shown in the front cross-sectional view of the main part in FIG. 7, the motor 12 and the base part 2 may be electrically connected by the compression connector 16. That is, a terminal plate 12 c to which lead wires 12 b (see FIG. 5) of the motor 12 are connected is provided on the motor cover 13, and the compression connector 16 is attached to the base 2.

  When the motor unit 11 is attached to the base unit 2, the terminal plate 12 c contacts the terminal 16 a of the elastic body of the compression connector 16. As a result, it is possible to avoid the mounting operation in the state in which the motor unit 11 hangs down due to the lead wire 12 b, and to further improve the mountability of the motor unit 11.

  In the blower 1 of the said structure, indoor illumination will be performed if the illumination part 5 is lighted. When the impeller 20 is rotated in the positive direction indicated by the arrow G by the drive of the motor 12, indoor air is supplied to the intake side of the impeller 20 through the flow opening 3a as indicated by the arrow K1 (see FIG. 1). . The air passes through the fan guard 40 by the impeller 20 as shown by arrow K2 (see FIG. 1) and is delivered downward from the opening 5c. Thereby, indoor air circulation is performed.

Second Embodiment
Next, FIG. 8 has shown front sectional drawing of the air blower 1 of 2nd Embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the shape of the base 2. The other parts are the same as in the first embodiment.

  The base portion 2 is covered by a cylindrical base cover 2 b having a diameter smaller than that of the impeller 20. Therefore, the space 6 above the impeller 20 is formed between the lower surface of the base portion 2 and the upper end of the impeller 20 at the inner peripheral portion, and between the ceiling surface L and the upper end of the impeller 20 at the outer peripheral portion It is formed. At this time, as in the first embodiment, the base portion 2, the impeller 20, and the fan guard 40 are disposed so as to satisfy the above-described equations (1), (2), and (3).

  As in the first embodiment, the blower 1 of the present embodiment performs indoor lighting when the lighting unit 5 is turned on. Further, the impeller 20 is rotated by the drive of the motor 12 (see FIG. 5), and air circulation in the room is performed.

Third Embodiment
Next, FIG. 9 has shown front sectional drawing of the air blower 1 of 3rd Embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the shape of the base 2. The other parts are the same as in the first embodiment.

  The base portion 2 is covered by a cylindrical base cover 2 b having a diameter larger than that of the impeller 20. For this reason, the space 6 above the impeller 20 is formed between the lower surface of the base portion 2 and the upper end of the impeller 20. At this time, as in the first embodiment, the base portion 2, the impeller 20, and the fan guard 40 are disposed so as to satisfy the above-described equations (1), (2), and (3).

  As in the first embodiment, the blower 1 of the present embodiment performs indoor lighting when the lighting unit 5 is turned on. Further, the impeller 20 is rotated by the drive of the motor 12 (see FIG. 5), and air circulation in the room is performed.

Next, FIG. 10 is a figure which shows the relationship between the space 6 above the impeller 20 of the air blower 1 of 1st, 2nd, 3rd embodiment, and air volume. In FIG. 10, the vertical axis indicates the air volume (unit: m ³ / min), and the horizontal axis indicates D1 / R (no unit). In the drawing, S1, S2 and S3 respectively indicate the first, second and third embodiments, and the aperture ratio of the fan guard 40 is about 100%, and the distance D3 is 2 mm. Moreover, the air volume is measured based on JISC9601-1990.

  FIG. 11 is a view showing the relationship between the space 6 above the impeller 20 of the blower 1 of the first, second, and third embodiments and the minimum aperture ratio of the fan guard 40. In FIG. 11, the vertical axis indicates the minimum aperture ratio (unit:%), and the horizontal axis indicates D1 / R (no unit). In the figure, P1, P2 and P3 respectively indicate the first, second and third embodiments, and the distance D3 is 2 mm (D3 / R = 0.0125).

  When the area shielded by the blade 41 is large and the pressure loss of the fan guard 40 is large, a backflow phenomenon occurs in which air flows from the opening 5c toward the circulation port 3a while the impeller 20 rotates in the forward direction (arrow G). Do. At this time, the aperture ratio at which the backflow phenomenon occurs is taken as the minimum aperture ratio. In the minimum aperture ratio, the openings 5c are shielded at predetermined intervals by a fan-shaped shielding jig, and the aperture ratio at the time of occurrence of the backflow phenomenon is measured.

  According to FIG. 10, the air volume increases as D1 / R becomes larger, and when it becomes 0.16 or more, it becomes almost saturated and takes the maximum value. In addition, the air volume increases in the order of the third embodiment S3, the first embodiment S1, and the second embodiment S2. According to FIG. 11, the minimum aperture ratio decreases as D1 / R increases. The minimum aperture ratio decreases in the order of the third embodiment P3, the first embodiment P1, and the second embodiment P2.

  At this time, when D1 / R is set to 0.07 (E1 in the figure) or more, a large air volume of about 85% or more of the maximum air volume can be obtained. At this time, the minimum aperture ratio is lower than about 75% in the worst third embodiment P3.

  The aperture ratio of the fan guard 40 is set to 80% or more in order to obtain a desired air volume and wind speed. For this reason, by satisfying the formulas (1) and (2) described above, it is possible to realize the blower 1 capable of preventing the backflow phenomenon with a large air volume.

FIG. 12 is a view showing the relationship between the distance D3 below the impeller 20 of the first embodiment, the minimum aperture ratio, and the air volume. In FIG. 12, the vertical axis indicates the minimum aperture ratio (unit:%) and the air volume (unit: m ³ / min), and the horizontal axis indicates D3 / R (no unit). D1 / R is 0.16, and the aperture ratio at the time of air volume measurement is about 100%.

  According to the figure, the air volume hardly changes with respect to D3 / R, and the minimum aperture ratio increases as the distance D3 increases. In FIG. 11 described above, the minimum aperture ratio is lower than about 75% in the worst third embodiment P3 when D3 / R is 0.0125. When the aperture ratio of the fan guard 40 is 80% or more, the reverse flow phenomenon can be prevented even if the minimum aperture ratio is increased by about 5 points as compared with the case where D3 / R is 0.0125. Therefore, the backflow phenomenon can be reliably prevented by satisfying the above-mentioned equation (3) and setting D3 / R to 0.08 or less (E2 in the figure).

Fourth Embodiment
Next, FIG. 13 shows a bottom view of the blower 1 of the fourth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the shape of the blade 41 of the fan guard 40. The other parts are the same as in the first embodiment.

  The blades 41 are radially disposed so as to bridge the ring portion 40a at the outer peripheral end of the fan guard 40 and the circular portion 40b covering the boss portion 20a. Both end surfaces in the circumferential direction of the blade 41 are formed in a curved (curved) shape (hereinafter, may be referred to as a “forward spiral”) curved outward in the positive rotational direction (the direction of arrow G). The radius of the circular portion 40b is, for example, 0.25R, where R is the radius of the impeller 20.

  Generally, the vertical component of the wind direction blown out from the opening 5c by the electric fan 10 spreads downward with respect to the rotation axis C, and the horizontal component spreads in a centrifugal direction with respect to the rotation direction (arrow G). Since the blade 41 is formed in a forward spiral shape curved along the wind direction, the pressure loss of the fan guard 40 can be reduced compared to the first embodiment.

  Accordingly, the minimum aperture ratio of the fan guard 40 can be made lower than in the first embodiment, and the margin for the risk of occurrence of the backflow phenomenon can be increased.

Fifth Embodiment
Next, FIG. 14 shows a bottom view of the blower 1 of the fifth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the shape of the blade 41 of the fan guard 40. The other parts are the same as in the first embodiment.

  The blades 41 are radially disposed so as to bridge the ring portion 40a at the outer peripheral end of the fan guard 40 and the circular portion 40b covering the boss portion 20a. Both end faces in the circumferential direction of the blade 41 are formed in a curved (curved reverse) shape with the outer circumferential side curved backward in the rotational direction in the positive direction (the direction of arrow G). The radius of the circular portion 40b is, for example, 0.25R, where R is the radius of the impeller 20.

  Since the blade 41 is formed in a reverse spiral shape that is curved in the opposite direction along the wind direction, the pressure loss of the fan guard 40 is larger than that in the first embodiment. Therefore, the margin for the risk of occurrence of the backflow phenomenon is smaller than that of the first embodiment, but the backflow phenomenon can be prevented by forming the aperture ratio large.

  FIG. 15 shows the relationship between the distance from the center of the blower 1 of the fourth embodiment and the fifth embodiment and the wind speed. In the figure, the vertical axis indicates the wind speed (unit: m / s), and the horizontal axis indicates the distance (unit: mm) from the center (rotation axis C). In the figure, "forward spiral" indicates the fourth embodiment, and "reverse spiral" indicates the fifth embodiment. Further, in the figure, “no fan guard” indicates a state in which the fan guard 40 is omitted for comparison.

  The wind speed is measured at a position of 960 mm downward from the lower surface of the fan guard 40, and the thickness in the vertical direction of the blade 41 is 8 mm, D1 / R1 = 0.16, D3 = 2 mm.

  According to the drawing, the maximum wind speed is the same in the case where the blade 41 has a forward spiral shape (fourth embodiment) and a reverse spiral shape (fifth embodiment). Further, when the blade 41 has a forward spiral shape or a reverse spiral shape, the maximum wind velocity is larger than that in a state where the fan guard 40 is omitted due to the rectifying action of the fan guard 40.

  Therefore, by providing the fan guard 40, the reach of the air flow can be extended. At this time, when the fan guard 40 has an aperture ratio close to 100%, the fan guard 40 is equivalent to the state where the fan guard 40 is omitted, so the fan guard 40 having an aperture ratio capable of obtaining a desired wind speed is disposed.

Further, the air volume at this time is 47 m ³ / min when the blade 41 has a normal spiral shape, and 26 m ³ / min when the blade 41 has a reverse spiral shape. For this reason, from the viewpoint of securing the air volume as well as the minimum aperture ratio, it is more desirable to use the forward spiral shape than the reverse spiral shape.

Sixth Embodiment
Next, FIG. 16 is a bottom view which shows the principal part of the fan guard of the air blower 1 of 6th Embodiment. Moreover, FIG. 17 has shown AA sectional drawing of FIG. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the shape of the blade 41 of the fan guard 40. The other parts are the same as in the first embodiment.

  Both end faces 41 a and 41 b in the circumferential direction of the blades 41 radially disposed are formed in a straight line along a center line perpendicular to the rotation axis C. Further, the end surfaces 41a and 41b are formed in an inclined surface which is inclined downward at an inclination angle α1 in the positive rotation direction (the direction of the arrow G) with respect to the vertical surface.

  As a result, the end faces 41a and 41b of the blade 41 are formed along the air flow (arrow K3) which is led downstream in the rotational direction by rotation of the impeller 20 (arrow K3). Therefore, the pressure loss of the fan guard 40 can be made smaller than that of the first embodiment. Therefore, the air volume can be further increased and the margin for the risk of occurrence of the backflow phenomenon can be further increased. Also in the fourth and fifth embodiments shown in FIGS. 14 and 15 described above, both end surfaces of the blade 41 may be formed as inclined surfaces.

Seventh Embodiment
Next, FIG. 18 is a bottom view which shows the principal part of the fan guard of the air blower 1 of 7th Embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. In the present embodiment, the shape of the blade 42 of the fan guard 40 is different from the blade 41 of the first embodiment. The other parts are the same as in the first embodiment.

  A plurality of blades 42 are provided concentrically around the rotation axis C on a bridge portion 40 c that bridges the ring portion 40 a and the circular portion 40 b of the fan guard 40. Both end surfaces in the radial direction of the blade 42 are formed in vertical surfaces. The radius of the circular portion 40b is, for example, 0.25R, where R is the radius of the impeller 20.

  Since the blades 42 are arranged concentrically, a swirling air flow formed by the impeller 20 rotating in the forward direction (arrow G) is delivered along the blades 42. For this reason, the pressure loss of the fan guard 40 can be reduced compared to the first embodiment. Accordingly, the minimum aperture ratio of the fan guard 40 can be made lower than in the first embodiment, and the margin for the risk of occurrence of the backflow phenomenon can be increased.

Eighth Embodiment
Next, FIG. 19 is a bottom view which shows the principal part of the fan guard of the air blower 1 of 8th Embodiment. Moreover, FIG. 20 has shown BB sectional drawing of FIG. For convenience of explanation, the same parts as those in the seventh embodiment shown in FIG. 18 described above are given the same reference numerals. The present embodiment differs from the seventh embodiment in the shape of the blade 42 of the fan guard 40. The other parts are the same as in the seventh embodiment.

  Both end surfaces 42a and 42b of the radial direction of the blade 42 disposed concentrically are formed in an inclined surface inclined downward at an outer peripheral side at an inclination angle α2 with respect to the vertical surface.

  As a result, the end faces 42a and 42b of the blade 42 are formed along the air flow (arrow K4) of which the downstream side is guided to the outer peripheral side by the centrifugal force as the impeller 20 rotates. Therefore, the pressure loss of the fan guard 40 can be smaller than that of the seventh embodiment. Therefore, the air volume can be further increased and the margin for the risk of occurrence of the backflow phenomenon can be further increased.

  Table 1 summarizes the characteristic comparison by the fan guard 40 of the air blower 1 of 1st, 4th, 5th, 7th embodiment. For comparison, the state in which the fan guard 40 is omitted is shown in parallel (Comparative Example 1). In Table 1, the crossing angle indicates the angle at which the swirling air flow intersects the blades 41 and 42 in the horizontal plane. In addition, the minimum aperture ratio indicates the case where D1 / R = 0.16 and D3 = 2 mm.

  According to the table, when the blades 41 and 42 are in the forward spiral shape and in the concentric shape, the air volume is large and the minimum aperture ratio is small, which has good characteristics. Next, when the blade 41 is linear, the characteristics of the air volume and the minimum aperture ratio are high. In addition, when the blade 41 is in the reverse spiral shape, the characteristics of the air volume and the minimum aperture ratio are lower than those in the linear shape, the normal spiral shape and the concentric shape.

The Ninth Embodiment
Next, FIG. 21 and FIG. 22 are a bottom view and a front sectional view showing the fan guard 40 of the blower 1 of the ninth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. The present embodiment differs from the first embodiment in the configuration of the fan guard 40. The other parts are the same as in the first embodiment.

  The fan guard 40 includes a fixed portion 43 fixed to the illumination portion 5 (see FIG. 1), and a movable portion 44 rotatable around the rotation axis C with respect to the fixed portion 43. The fixed portion 43 and the movable portion 44 respectively have blades 41 and 45 radially disposed. Both circumferential end surfaces of the blades 41 and 45 are formed in a straight line along a center line perpendicular to the rotation axis C.

  The overlapping state of the blade 41 and the blade 45 is changed by the rotation of the movable portion 44, and the aperture ratio of the fan guard 40 is varied. At this time, the aperture ratio is larger than the minimum aperture ratio when the blade 41 and the blade 45 overlap, and smaller than the minimum aperture ratio when the blade 45 is disposed between the blades 41.

  Thereby, it is possible to intentionally generate the backflow phenomenon in a state where the impeller 20 (see FIG. 1) is rotated in the forward direction. For example, when the room temperature is low, if the air is blown directly below the blower 1, the user is directly hit by the wind and the comfort is reduced. At this time, if the rotation direction of the motor 12 (see FIG. 5) is set to be reversible, the cost of motor control increases. In addition, since there is a risk that the fixing screw 21 (see FIG. 3) may come off due to the loosening, the fixing structure of the impeller 20 is complicated. Therefore, by generating the reverse rotation phenomenon by the rotation of the movable portion 44, the blowing direction of the blower 1 can be changed with an inexpensive configuration, and the comfort can be improved.

Tenth Embodiment
Next, FIG. 23, FIG. 24, FIG. 25 are perspective views, front sectional views and side sectional views showing the mounting portion 22 including the boss 20a of the impeller 20 (see FIG. 1) of the blower 1 of the tenth embodiment. is there. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. In this embodiment, the fixing screw 21 (see FIG. 3) is omitted, and the mounting structure of the impeller 20 is different from that of the first embodiment. The other parts are the same as in the first embodiment. Although not shown in these drawings, a plurality of blades are provided on the outer peripheral surface of the boss 20a.

  A pin 23 projecting perpendicularly to the axial direction is attached to the motor shaft 12 a of the motor 12. A fitting hole (not shown) in which the motor shaft 12a is fitted passes through the rotation axis C of the boss portion 20a. A V-shaped tapered groove 20d extending in one direction is formed on the upper surface of the boss 20a. A recess 20b having a rectangular shape in a plan view is formed on the lower surface of the boss 20a. Through holes 24c through which the blade fixing members 24 are inserted are provided at four places around the fitting holes on the seat surface of the recess 20b.

  The blade fixing members 24 are provided in a pair, and have shaft portions 24 d that horizontally project from extension portions 24 e extending in the direction in which they approach each other. By fitting a hole (not shown) formed on the inner wall of the recess 20b with the shaft 24d, the blade fixing member 24 is rotatably disposed. The lower end of the blade fixing member 24 protrudes from the lower surface of the boss 20a, and is provided with a grip 24a extending outward. A compression spring 25 is disposed between the two grips 24a to bias the grips 24a outward. The blade fixing member 24 is restricted from pivoting in the direction in which the holding portion 24a is separated by the upper surface of the extension portion 24e abutting on the seat surface of the recess 20b.

  Further, the blade fixing member 24 is provided with a lever portion 24 b extending upward from the inner peripheral end of the holding portion 24 a. The lever portions 24b are provided at two places aligned with the blade fixing members 24 in a direction parallel to the tapered groove 20d, and the lever portions 24b are inserted into the through holes 24c. The upper end of the lever portion 24b is provided with an engagement claw 24c bent inward. The upper surface of the engagement claw 24c is formed in an inclined surface whose outer side is inclined upward.

  In the fan 1 of the above configuration, the motor shaft 12a is inserted into the fitting hole in a state where the direction of the pin 23 and the direction of the tapered groove 20d are aligned when the impeller 20 is attached. When the pin 23 abuts on the engaging claw 24c as shown in FIG. 26, the blade fixing member 24 pivots in the direction in which both the engaging claws 24c are separated since the upper surface of the engaging claw 24c is formed as an inclined surface.

  Then, as shown in FIG. 24, when the pin 23 abuts on the lower end of the tapered groove 24d, the engaging claw 24c engages with the pin 23 by the biasing of the compression spring 25. As a result, the boss 20a is urged in the direction of pressing the pin 23 by the compression spring 25, and the impeller 20 is held by the motor shaft 12a. The driving of the motor 12 rotates the impeller 20 integrally with the motor shaft 12a.

  In addition, when the both gripping portions 24 a are gripped in a direction approaching the biasing force of the compression spring 25, the engagement between the engagement claw 24 c and the pin 23 is released. And the impeller 20 can be pulled down and removed in the state which pinched the knob part 24a.

  According to the present embodiment, the pin 23 is positioned so as to be engaged with the tapered groove 20d, and the torque of the motor 12 is received by the tapered groove 20d so that no force is applied to the engaging claw 24c. Further, since the lift of the impeller 20 is held by the end face of the engagement claw 24c, the force does not act directly on the compression spring 25 disposed in the horizontal direction. Thus, the rotational force of the motor 12 can be reliably transmitted to the impeller 20, and the reliability of fixing the impeller 20 can be improved.

  Further, the user can easily attach and detach the impeller 20 with one hand, and the workability at the time of attaching and detaching the impeller 20 can be improved. In addition, the impeller 20 can be prevented from falling off even if the motor 12 is rotated in the direction opposite to the forward direction indicated by the arrow G (see FIG. 2), and the air blowing direction can be varied according to the indoor environment. it can.

Eleventh Embodiment
Next, FIG. 27, FIG. 28, FIG. 29 are perspective views of the mounting portion 32 including the boss 20a of the impeller 20 (see FIG. 1) of the blower 1 according to the eleventh embodiment. The figure and the disassembled perspective view are shown. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals.

  In this embodiment, the fixing screw 21 (see FIG. 3) is omitted, and the mounting structure of the impeller 20 is different from that of the first embodiment. The other parts are the same as in the first embodiment. Although not shown in these drawings, a plurality of blades are provided on the outer peripheral surface of the boss 20a.

  The boss portion 20a is provided with a through hole 20h penetrating in the axial direction, and a plurality of axially extending ribs 20j are provided in parallel in the circumferential direction on the inner surface of the through hole 20h. The upper surface of the rib 20j is formed as an inclined surface in which the inner side is lowered, and the lower surface of the rib 20j is disposed above the lower surface of the boss portion 20a. A radially projecting flange 20k is formed at the lower end of the boss 20a.

  The shaft support portion 34 is inserted into the through hole 20 h of the boss portion 20 a. The shaft support portion 34 has a fitting hole 34a into which the motor shaft 12a (see FIG. 30) is fitted, and a plurality of axially extending ribs 34b are circumferentially arranged in parallel on the circumferential surface. The ribs 34b are disposed between the ribs 20j of the boss 20a.

  At the lower end of the shaft support portion 34, a radially projecting flange portion 34e is provided. A compression spring 35 is disposed between the upper surface of the flange portion 34e and the lower surface of the rib 20j of the boss portion 20a. As a result, the boss 20 a is biased upward with respect to the shaft support 34. An annular groove 34d is formed at the upper end of the shaft support 34, and the restraining ring 37 disposed in the groove 34d abuts on the upper surface of the rib 20j to prevent the boss 20a from coming off.

  A plurality of tapered holes 34 c in which the balls 36 are fitted open in the circumferential surface between the ribs 34 b of the shaft support portion 34. The tapered hole 34c is formed in a tapered shape that is narrow on the side of the fitting hole 34a, and has a size that prevents the ball 36 from falling into the fitting hole 34a. Further, the balls 36 disposed in the tapered holes 34c are prevented from coming off to the outside by the ribs 20j of the boss portion 20a.

  FIG. 30 shows a front sectional view of the mounting portion 32. As shown in FIG. An annular groove 12e is recessed in the motor shaft 12a of the motor 12 (see FIG. 5), and a pin (not shown) projecting in a direction perpendicular to the axial direction is provided. Further, a groove (not shown) engaged with the pin of the motor shaft 12a is provided on the upper surface of the boss 20a.

  In the fan 1 configured as described above, when the impeller 20 is attached, the bosses 20a and the flanges 20k and 34e of the shaft support 34 are held and brought close to each other against the biasing force of the compression spring 35. Thereby, the ball 36 is disposed above the upper surface of the rib 20 j. Next, when the motor shaft 12a is inserted into the fitting hole 34a, the ball 36 retracts to the outer peripheral side, and the lower end of the motor shaft 12a is disposed below the ball 36.

  Next, when the finger is released from the flange portion 34e, the boss portion 20a is urged upward with respect to the flange portion 34e by the compression spring 35. At this time, the ball 36 projects from the taper hole 34c to the outer peripheral side to abut the motor shaft 12a, and maintains the state of being disposed on the rib 20j. Then, as shown in FIG. 30, when the groove 12e of the motor shaft 12a inserted into the fitting hole 34a faces the ball 36, the ball 36 rolls on the upper surface of the rib 20j and fits in the groove 12e. At this time, the ball 36 is prevented from falling off by the inner peripheral surface of the rib 20 j.

  Then, a pin provided on the motor shaft 12a engages with a groove provided on the boss 20a, and the driving of the motor 12 rotates the impeller 20 integrally with the motor shaft 12a.

  When the flange 20k of the boss 20a is pulled downward when removing the impeller 20, the ball 36 is disposed above the rib 20j. Further, when the boss portion 20a is pulled, the ball 36 is pushed outward by the motor shaft 12a, and the impeller 20 can be pulled out and removed from the motor shaft 12a.

  According to this embodiment, the user can easily attach and detach the impeller 20 with one hand, and the workability at the time of attaching and detaching the impeller 20 can be improved. In addition, the impeller 20 can be prevented from falling off even if the motor 12 is rotated in the direction opposite to the forward direction indicated by the arrow G (see FIG. 2), and the air blowing direction can be varied according to the indoor environment. it can.

Twelfth Embodiment
Next, FIG. 31 shows a front cross-sectional view of the blower 1 of the twelfth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. In the present embodiment, the wind direction plate 7 is provided above the fan guard 40. Further, the impeller 20 of the present embodiment is rotatable in the forward direction and the reverse direction (counterclockwise as viewed from below) shown by the arrow G (see FIG. 2). The other parts are the same as in the first embodiment.

  The wind direction plate 7 is provided rotatably. When the impeller 20 rotates in the forward direction by the drive of the motor 12 (see FIG. 5), indoor air is supplied to the impeller 20 through the flow opening 3a as shown by the arrow K1. When the wind direction plate 7 is inclined at a small angle with respect to the vertical, as shown by the arrow K2, the downward blowing state where the air is blown downward from the opening 5c is obtained. In addition, when the wind direction plate 7 is inclined at a large angle with respect to the vertical, the air is blown out from the opening 5c in a substantially horizontal direction.

  Further, when the impeller 20 rotates in the reverse direction, indoor air is supplied to the impeller 20 through the opening 5 c as indicated by the arrow K11. The air is blown upward from the flow opening 3a as indicated by the arrow K12, and the air is blown upward.

  FIG. 32 shows the state of air flow in the room at the time of downward blowing. The blower 1 is attached to the central portion of the ceiling surface L of the room R. The air flow sent downward from the opening 5c of the blower 1 flows along the floor Z when it reaches the floor Z as shown by the arrow K5. Then, the air flow moves upward along the side wall W, and is guided to the circulation port 3a (see FIG. 31). At this time, since the air flow circulates along the floor Z, the air in the vicinity of the floor Z can be efficiently diffused.

  For example, when the cooling operation is performed by an air conditioner or the like in summer, cold air tends to be accumulated on the floor surface Z. For this reason, the user inside the room feels the heat in the upper body and is uncomfortable. At this time, since the cool air is diffused by blowing the air downward by the blower 1 and the temperature of the whole room becomes uniform, the room becomes a comfortable environment. In addition, when the user feels the wind by the air blowing, the sensible temperature is lowered, and the setting temperature of the cooling is set high or the cooling becomes unnecessary. Thereby, energy saving can be achieved.

  However, if the wind speed of the air flow sent from the blower 1 is too high, there is a possibility that the user in the room feels wind and is uncomfortable. On the other hand, when the wind speed of the air flow is too small, it is difficult to obtain a comfortable environment since the unevenness of the temperature distribution in the room is not eliminated. Therefore, it is necessary to set an appropriate wind speed.

  At this time, the temperature distribution and the influence of the wind hitting the user also affect the size of the room R and the blowing direction. Therefore, let v (m / s) be the wind speed at the time of blowout, b (m) be the distance from the outlet (opening 5c) to the floor Z, and θ (°) be the delivery angle of the air flow relative to the horizontal plane. F was defined as shown in equation (4). Here, since the downward blowing is performed, the delivery range H1 is in the range of 30 ° <θ ≦ 90 °. The delivery angle θ is set by the arrangement of the wind direction plate 7.

F (b, θ, v) = v ³ / b ² × tan (θ-30) (4)

  At this time, when the blower 1 is installed and operated to satisfy 0.1 ≦ F ≦ 100, a comfortable indoor environment can be obtained by preventing the user's discomfort from the results of the temperature distribution measurement and the sensation test. Was found.

  FIG. 33 shows an example of measuring the temperature distribution at the time of downward blowing, and shows the relationship between the installation function F and the temperature difference ΔT (° C.) in the room. In the figure, the vertical axis is the temperature difference ΔT, and the horizontal axis is the installation function F. The installation function F is varied by varying the wind speed v with the distance b = 2 m and the delivery angle θ = 70 °.

  In addition, the size of the room R is 8 tatami, and the temperature during heating operation by the air conditioner is measured. A plurality of temperature measurement points are provided in the room, each 5 cm from each side wall W as the outermost, and the difference between the maximum temperature and the minimum temperature is taken as the temperature difference ΔT. The maximum temperature in the vicinity of the ceiling and the minimum temperature in the vicinity of the floor surface before the driving of the electric fan 10 of the blower 1 were obtained, and the temperature difference at this time was about 9 ° C.

  According to the figure, when the setting function F is lower than 0.1, the temperature difference ΔT exceeds 3 ° C., and the unevenness of the temperature distribution is not eliminated. That is, in the case of F <0.1, the wind does not reach the floor Z due to the small wind speed v or the large distance b or the small delivery angle θ, and the temperature unevenness is not eliminated.

  In addition, when the setting function F exceeds 100, the wind hitting the user becomes strong, which is an environment in which the user feels uncomfortable. That is, in the case of F ≧ 100, the wind blows strongly to the feet of the user due to the large wind velocity v or the small distance b, or the large transmission angle θ, resulting in an unpleasant environment. Therefore, by satisfying 0.1 ≦ F ≦ 100, a comfortable environment can be obtained.

  FIG. 34 shows the state of the air flow in the room when the air is blown upward. When the impeller 20 rotates in the reverse direction by rotating the motor 12 in the reverse direction to the downward blowing direction, the air delivered upward from the blower 1 circulates along the ceiling surface L as shown by the arrow K15. Then, the air flow moves downward along the side wall W to circulate on the floor surface Z, ascends the central portion of the room R and is guided to the opening 5 c (see FIG. 31). Thereby, the air of the ceiling surface L can be diffused efficiently.

  For example, when the heating operation is performed by an air conditioner or the like in the winter, warm air is easily accumulated on the ceiling surface L. At this time, warm air can be delivered to the lower side of the room by blowing air upward by the blower 1. As a result, the air in the lower part of the room R is warmed, and the comfort of the user in the room can be improved.

  Moreover, since the whole room R including the floor surface Z and the lower part of the side wall W is warmed, temperature setting can be set low. Thereby, energy saving can be achieved. In addition, since the wind does not directly hit the user inside the room, there is no discomfort and it is possible to eliminate the unevenness of the temperature distribution.

  Also, in summer, downward blowing is performed to make the user feel cool by a comfortable wind. However, when the user in the room feels cold during the cooling operation, the air can be efficiently circulated without causing the user to feel the wind by setting the upper blowout.

  In the fan 1 of the above configuration, when the wind speed of the air flow sent from the fan 1 is too small, the air does not circulate, so the unevenness of the temperature distribution in the room is not eliminated. On the other hand, if the wind speed of the air flow is too high, the user in the room may feel the wind and become uncomfortable.

  Therefore, let v (m / s) be the wind speed at the time of blowing, d (m) be the distance from the opening 5c to the ceiling surface L, θ (°) be the delivery angle of the air flow with respect to the horizontal plane, and It was defined as shown in 5). Here, since the upper blowing is performed, the delivery range H2 is in the range of 30 ° <θ ≦ 90 °.

F (d, θ, v) = v / d ² × tan (θ-30) (5)

  At this time, when the blower 1 is installed and operated to satisfy 1 ≦ F ≦ 100, a comfortable indoor environment is prevented by preventing the user's discomfort based on the results of the temperature distribution measurement and the sensation test similar to the above. can get.

  FIG. 35 shows the state of air flow in the room at the time of horizontal blowing. At the time of horizontal blowing, the arrangement of the wind direction plate 7 is changed with respect to the time of downward blowing, and an air flow is sent out from the opening 5 c of the blower 1 in a substantially horizontal direction. The air flow delivered from the opening 5 c flows downward along the side wall W when it reaches the side wall W, as shown by the arrow K 6. Then, the air flow circulates on the floor surface Z, and ascends to the central portion of the room R and is guided to the circulation port 3a.

  In the case of horizontal blowout, it is difficult for the user to hit the wind directly, so the user is suitable for women, elderly people, sick people, infants, etc. Moreover, energy saving can be achieved while improving comfort by eliminating the unevenness of the temperature distribution in the room during the heating operation in winter. In addition, since strong wind is not locally blown to the floor Z as in downward blowing, dust on the floor is unlikely to scatter, and wind is not blown to the ceiling as in upward blowing, so dust on the ceiling L is scattered. Hateful.

  Further, the upward blowing and the horizontal blowing may be switched. For example, when the ceiling is heated by solar radiation, the indoor temperature is further increased by agitating the heated air of the ceiling in the winter, so that the upward blowing is preferable. On the other hand, in summer, the room temperature is increased by agitating the heated air of the ceiling portion, so horizontal blowing is preferable.

  In addition, even during the cooling operation in summer, the user can not feel the wind directly but can feel the soft wind, which is effective for overcooling. In addition, air can be efficiently circulated without feeling wind by performing downward blowout at the time of cooling operation and performing horizontal blowout when the user feels cold. Therefore, a good indoor environment can be achieved throughout the year including winter and summer.

  In the fan 1 of the above configuration, when the wind speed of the air flow sent from the fan 1 is too small, the air does not circulate, so the unevenness of the temperature distribution in the room is not eliminated. On the other hand, if the wind speed of the air flow is too high, the user in the room may feel the wind and become uncomfortable.

  Therefore, let v (m / s) be the wind speed at the time of blowing, b (m) be the distance from the opening 5c to the floor Z, θ (°) be the delivery angle of the air flow with respect to the horizontal plane, and It was defined as shown in 6). The delivery angle θ is positive at the bottom and negative at the top. Here, since it is horizontal blowing, the sending range H3 is set as the range of -30 ° <θ ≦ 30 °.

F (b, θ, v) = v / b ² × cos θ (6)

  At this time, when the blower 1 is installed and operated so as to satisfy 0.5 ≦ F ≦ 100, a comfortable room is prevented by preventing the user's discomfort based on the result of the temperature distribution measurement and the sensation test similar to the above. Environment is obtained.

  In the present embodiment, although the blower 1 can blow downward and upward and horizontal blowout, installation and operation may be performed based on the installation function F in the blower 1 that performs either one or two.

  Moreover, although the downward blowing and the horizontal blowing are switched by the wind direction board 7, you may switch by another structure. For example, double fan guards 40 may be provided, and one of the fan guards 40 may be movable between the outside of the opening 5c and the position immediately below the opening 5c by a linear guide or the like. At this time, the delivery angle θ can be set, for example, by the inclination of the end faces 42 a and 42 b of the blade 42 of the fan guard 40 as shown in FIG. 20 described above. Further, the electric fan 10 may be formed so as to be rotatable so as to change the delivery direction like a fan.

  Further, in the present embodiment, in order to rotate the impeller 20 in the forward direction and the reverse direction, the impeller 20 is attached by the attaching portions 22 and 32 of the tenth and eleventh embodiments shown in FIGS. 23 to 30 described above. May be

13th Embodiment
Next, FIG. 36 shows a front cross sectional view of the air blower 1 of the thirteenth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 described above are given the same reference numerals. In the present embodiment, an ion generator 50 is provided. Further, the fan guard 40 (see FIG. 1) is omitted, and the shape of the illumination unit 5 is different from that of the first embodiment. The other parts are the same as in the first embodiment.

  The inner peripheral surface of the illumination cover 5a of the illumination unit 5 is formed in a cylindrical surface, and the cross-sectional shape is formed in a substantially elliptical shape. The ion generator 50 is installed on an inclined surface formed on the periphery of the lower surface of the base cover 2 b covering the base 2. A plurality of ion generators 50 may be provided.

The ion generator 50 has a pair of electrodes (not shown) to which a voltage consisting of an alternating current waveform or an impulse waveform is applied. A positive voltage is applied to one of the electrodes, and the corona discharge ionizes water molecules in the air to generate hydrogen ions. These hydrogen ions cluster with water molecules in the air by solvation energy. As a result, positive ions of air ions consisting of H ⁺ (H ₂ O) m (m is 0 or any natural number) are released.

A negative voltage is applied to the other electrode, and corona discharge ionizes oxygen molecules or water molecules in the air to generate oxygen ions. The oxygen ions cluster with water molecules in the air by solvation energy. ^{_{Thus, O 2 - (H 2 O}} ) n (n is an arbitrary natural number) negative ions of the air ions consisting of is released.

H ⁺ (H ₂ O) m and _{^{O 2 - (H 2 O)}} n surrounds these aggregated on the surface of airborne bacteria and odor components in the air. Then, as shown in the formulas (8) to (10), by collision, [· OH] (hydroxyl radical) and H ₂ O ₂ (hydrogen peroxide) which are active species are aggregated and formed on the surface of a microorganism or the like. Destroy airborne bacteria and odorous components. Here, m 'and n' are arbitrary natural numbers. Therefore, sterilization and odor removal of a room can be performed by sending through the opening 5 c an air flow including positive ions and negative ions released from the ion generator 50 toward the space 6.

_{^{H + (H 2 O) m}} + O 2 - (H 2 O) n → · OH + 1 / 2O 2 + (m + n) H 2 O ··· (8)
_{^{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ 2 · OH + O ₂ + (m + m '+ n + n') H ₂ O (9)
_{^{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ H ₂ O ₂ + O ₂ + (m + m '+ n + n') H ₂ O (10)

  At this time, ions are emitted substantially vertically downward from the ion generator 50 installed on the peripheral portion of the lower surface of the base cover 2b. The emission direction of the ions is a direction orthogonal to the plane when the electrode is a plane, and is a direction parallel to the extending direction of the electrode when the electrode is needle-like. The ions released from the ion generating device 50 are included in the air flowing into the flow opening 3a as indicated by the arrow K1. Thereby, ions can be easily included in the air flow sent out from the opening 5 c.

Fourteenth Embodiment
Next, FIG. 37 shows a front cross-sectional view of the blower 1 of the fourteenth embodiment. For convenience of explanation, the same parts as those of the thirteenth embodiment shown in FIG. The present embodiment is different from the thirteenth embodiment in the shape of the base portion 2. The other parts are the same as in the thirteenth embodiment.

  The base portion 2 is covered by a cylindrical base cover 2 b having a diameter larger than that of the impeller 20 as in the third embodiment. The ion generator 50 is disposed on the periphery of the base 2 and emits ions substantially vertically downward. Thus, as in the thirteenth embodiment, ions can be easily included in the air flow sent out from the opening 5c.

The fifteenth embodiment
Next, FIG. 38 has shown front sectional drawing of the air blower 1 of 15th Embodiment. For convenience of explanation, the same parts as those in the fourteenth embodiment shown in FIG. 37 described above are given the same reference numerals. The present embodiment is different from the fourteenth embodiment in the arrangement of the ion generating device 50. The other parts are the same as in the fourteenth embodiment.

  The ion generator 50 is attached to the support 3 and emits ions in the direction along the air flow flowing in from the flow port 3a. Thereby, ions can be easily included in the air flow sent out from the opening 5 c. The ions may be emitted from the ion generator 50 in any direction between the horizontal direction and the vertically downward direction. At this time, it is more desirable to discharge ions in a direction parallel to the air flow introduced from the flow port 3a to the impeller 20, because the annihilation due to the collision of the ions can be reduced.

Sixteenth Embodiment
Next, FIG. 39 shows a front cross-sectional view of the blower 1 of the sixteenth embodiment. For convenience of explanation, the same parts as those in the fourteenth embodiment shown in FIG. 37 described above are given the same reference numerals. The present embodiment is different from the fourteenth embodiment in the arrangement of the ion generating device 50. The other parts are the same as in the fourteenth embodiment.

  The ion generator 50 is attached to the upper surface of the peripheral portion of the illumination unit 5 and emits ions substantially vertically upward. Thereby, ions can be easily included in the air flow sent out from the opening 5 c.

  Next, in the blower 1 of the fourteenth to sixteenth embodiments, the wind speed of the air flow passing through the flow port 3a was measured. The radius R of the impeller 20 is 160 mm, the diameter of the opening 5 c is 365 mm, and the distance between the lower surface of the base 2 and the ceiling surface L is 50 mm. As a result, the wind speed at the lower surface of the base portion 2 was 2.2 m / s. The wind speed at the midpoint in the vertical direction of the support 3 was 1.8 m / s. The wind speed at the upper surface of the illumination unit 5 was 1.1 m / s.

  In general, it is known that ions are widely diffused when released to a point where the flow velocity of air is high. For this reason, the case where the ion generator 50 is arranged on the support column 3 (the fifteenth embodiment) is more desirable than the case where the ion generator 50 is arranged on the upper surface of the illumination unit 5 (the sixteenth embodiment) because ions can be uniformly transmitted. Further, the ion generator 50 is more preferable because the ions can be more uniformly delivered (in the fourteenth embodiment) than in the case where the ion generator 50 is disposed in the support 3 (the fifteenth embodiment) than in the case where the ion generator 50 is disposed in the lower portion .

  In the present embodiment, the air flow containing positive ions and negative ions is sent out from the blower 1, but the air flow containing any one of the ions may be sent out. Thus, the charge of the ions can remove the potential of the object to be attached that is suspended in the space in the room. In addition, the ion balance of the indoor space can be adjusted.

  In addition, the ion generation device 50 may be, for example, a device that generates charged particulate water containing a radical component.

  In the first to sixteenth embodiments, the blower provided with the annular illumination unit 5 is described, but the same applies to the blower 1 provided with the annular annular portion having the hollow portion 5b in which the impeller 20 is disposed. The same effect can be obtained depending on the configuration.

  ADVANTAGE OF THE INVENTION According to this invention, it can install in the ceiling surface of a room | chamber interior, and can utilize for the air blower which air-circulates.

Reference Signs List 1 blower 2 base portion 2a mounting member 2b base cover 2c locking bolt 3 support 5 illumination portion 5a illumination cover 5b hollow portion 5c opening 6 space 7 wind direction plate 10 electric fan 11 motor 12 motor 12a motor shaft 12b lead 13 motor Cover 13b Dalma hole 15 Snap lock 16 Compression connector 20 Impeller 20a Boss 20b, 20h Through hole 20c Recess 20d Tapered groove 20j, 34b Rib 20k, 34e Flange 21 Fixing screw 22, 32 Mounting 23 Pin 24 Blade fixing member 24a Picking portion 24b Lever portion 24c Engaging claw 25, 35 Compression spring 34 Shaft support portion 34a Fitting hole 34c Tapered hole 36 Ball 37 Restraint ring 40 Fan guard 41, 42, 45 Blade 43 Fixed portion 44 Movable portion 50 Ion generator

Claims (3)

An electric fan having a base portion attached to a ceiling surface of a room, a motor fixed to the base portion, and an impeller rotating by a rotation axis perpendicular to the mounting surface of the base portion by the motor; An annular portion formed in an annular shape having a cylindrical hollow portion in which a vehicle is disposed and forming an air flow port between the ceiling surface and the annular portion attached to the base portion, and a plurality of blades A fan guard disposed on a lower end surface of the hollow portion, wherein the fan blows downward when the impeller rotates in a predetermined positive direction,
The fan guard is provided separately from the annular portion,
An outer peripheral end of the fan guard is attached to the annular portion;
The base unit includes a power supply substrate and a drive substrate of the electric fan and is covered with a truncated cone-shaped base cover so that the outer peripheral portion is formed into an inclined surface.
The large diameter portion of the truncated cone shape of the base cover is on the ceiling side,
A plurality of columns extend around the base portion, the flow openings are formed between the columns, the annular portion is attached to the lower ends of the columns, and the lower ends of the columns are lower than the upper ends of the impellers. A blower characterized by   The plurality of blades are radially disposed, and both end surfaces in the circumferential direction of the blades are formed in a straight line or a curved shape whose outer peripheral side is curved forward in the positive rotation direction. Blower as described.   The blower according to claim 1 or 2, wherein the annular portion comprises a lighting unit that performs lighting.