JP6745006B2 - Blower - Google Patents

Description

The present invention relates to a blower installed on a ceiling surface in a room to circulate air.

A conventional blower that is installed on a ceiling surface in a room and circulates air in the room is disclosed in Patent Document 1. In this blower, a motor is fixed to a mounting bracket attached to the ceiling surface, and an impeller is attached to the motor shaft of the motor. By driving the motor, the impeller rotates on a vertical rotating shaft, and air is circulated in the room.

In recent years, a blower has been commercialized in which a so-called ceiling light that illuminates the inside of a room and a blower are integrated, and an illumination unit is arranged around the impeller. This blower has a base portion attached to the ceiling surface. A power supply board is incorporated in the base part, and a motor of an electric fan is attached to the base part. An impeller is attached to the motor shaft of the motor.

The illuminating part is formed in an annular shape having a cylindrical hollow part, forms an air flow port with the ceiling surface, and is attached to the base part by a pillar. The impeller is arranged in the cavity, and a fan guard having a plurality of blades is provided at an opening at the lower end of the cavity. The fan guard prevents the impeller from coming into contact with foreign matter, and the opening is formed to have an opening ratio according to a desired wind speed.

In the blower having the above configuration, indoor lighting is performed when the lighting unit is turned on. When the impeller rotates in a predetermined forward direction by driving the motor, the air supplied to the impeller through the flow port is discharged downward from the opening to circulate the air in the room.

JP, 2003-269385, A

In the conventional case, when the cooling operation is performed by an air conditioner or the like in the summer, cold air is easily accumulated on the floor surface Z. For this reason, the user in the room feels heat in the upper body and is uncomfortable. When the heating operation is performed by the air conditioner or the like in the winter, warm air is easily accumulated on the ceiling surface L. Therefore, there is a problem that the user in the room feels cold in the lower half of the body and is uncomfortable.

An object of the present invention is to provide a blower that can make a room a comfortable environment regardless of whether it is summer or winter.

A blower according to one aspect is a base unit mounted on a ceiling surface in a room, an electric fan having an impeller rotated by a motor, and a base cover that covers the base unit and arranges the electric fan below the ceiling surface. And an illuminating section which is formed in an annular shape having a cylindrical hollow portion in which the impeller is arranged and which has an LED for performing illumination by forming an air circulation port with the ceiling surface. , delivery direction of the air current generated by the electric fan, viewed contains an inclined direction inclined to the ceiling surface, the electric fan, the axis of rotation of the impeller is tiltable with respect to the vertical direction , A plurality of columns that are rotatable so as to change the delivery direction, connect the upper surface of the lighting unit and the base unit, and form the air circulation port, the plurality of columns and the lighting The connection point with the part is located below the upper end of the impeller.

According to the present invention, air can be efficiently diffused during cooling and heating. As a result, it is possible to suppress temperature unevenness in the room, create a comfortable environment for the user, and save energy.

The front sectional view showing the fan of a 1st embodiment of the present invention. The bottom view which shows the air blower of 1st Embodiment of this invention. The disassembled perspective view which shows the air blower of 1st Embodiment of this invention. The disassembled perspective view which shows the base part of the air blower of 1st Embodiment of this invention. The perspective view which shows the motor part of the air blower of 1st Embodiment of this invention. FIG. 3 is a schematic front sectional view showing another mounting structure of the motor unit of the blower of the first embodiment of the present invention. FIG. 3 is a schematic front sectional view showing another mounting structure of the motor unit of the blower of the first embodiment of the present invention. The front sectional view showing the fan of a 2nd embodiment of the present invention. The front sectional view showing the fan of a 3rd embodiment of the present invention. The figure which shows the space above the impeller of the air blower of 1st-3rd embodiment of this invention, and the relationship of air volume. The figure which shows the relationship between the space above the impeller of the air blower of 1st-3rd embodiment of this invention, and minimum aperture ratio. The figure which shows the clearance gap below the impeller of the air blower of 1st Embodiment of this invention, and a minimum aperture ratio and an air volume. The bottom view which shows the air blower of 4th Embodiment of this invention. The bottom view which shows the air blower of 5th Embodiment of this 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 a wind speed. The partial bottom view showing the important section of the fan of a 6th embodiment of the present invention. FIG. 17 is a sectional view taken along line AA of FIG. 16. The bottom view which shows the air blower of 7th Embodiment of this invention. The partial bottom view showing the important section of the fan of an 8th embodiment of the present invention. FIG. 20 is a sectional view taken along line BB of FIG. 19. The bottom view which shows the fan guard of the air blower of 9th Embodiment of this invention. The front sectional view showing the fan guard of the fan of a 9th 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. The side 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 state at the time of attachment of the attachment part of the impeller of the air blower of 11th Embodiment of this invention. The perspective view which looked at the attachment part of the impeller of the fan of an 11th embodiment of the present invention from the lower part. The perspective view which looked at the attachment part of the impeller of the fan of an 11th embodiment of the present invention from the upper part. The disassembled perspective view of the attachment part of the impeller of the air blower of 11th Embodiment of this invention. The front cross-sectional view of the attachment part of the impeller of the air blower of 11th Embodiment of this invention. The front sectional view showing the fan of a 12th embodiment of the present invention. The front cross-sectional view which shows the room at the time of 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 downward blowing by the air blower of 12th Embodiment of this invention, and the indoor temperature difference. The front sectional view showing the room at the time of upper blow by the air blower of a 12th embodiment of the present invention. The front sectional view showing the room at the time of horizontal blowout by the fan of a 12th embodiment of the present invention. The front sectional view showing the fan of a 13th embodiment of the present invention. The front sectional view showing the fan of a 14th embodiment of the present invention. The front sectional view showing the fan of a 15th embodiment of the present invention. The front sectional view showing the fan of a 16th embodiment of the present invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. 1, 2, and 3 show a front sectional view, a bottom view, and an exploded perspective view of the blower of the first embodiment. The blower 1 has a base portion 2 mounted on the ceiling surface L via a mounting member 2a. For example, a general hook ceiling is used for the mounting member 2a. The base portion 2 has a power supply substrate and a drive substrate for the illumination unit 5 and the electric fan 10 which will be described later, and is covered with a truncated cone-shaped base cover 2b so that the outer peripheral portion is formed into 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 fan, and has a motor unit 11 that houses a motor 12 (see FIG. 5) and an impeller 20. The impeller 20 is provided with a plurality of blades on the outer peripheral surface of the central boss portion 20a. The impeller 20 is attached by inserting the boss portion 20a into the motor shaft 12a of the motor 12 and screwing a fixing screw 21 into a screw portion formed on the motor shaft 12a. The fixing screw 21 is formed as a reverse screw with respect to the rotation direction (arrow G) of the impeller 20 described later.

As a result, a space 6 is formed above the impeller 20 between the lower surface of the base portion 2 and the upper end of the impeller 20 to allow air to flow therethrough. The impeller 20 is driven by the motor 12 to rotate clockwise in a positive direction as viewed from the bottom surface as shown by an arrow G about a rotation axis C perpendicular to the mounting surface (ceiling surface L) of the base portion 2 and downward. Deliver an airflow. The radius R of the impeller 20 is preferably about 160 mm, and the blade cross-section height of the impeller 20 is preferably about 50 mm.

A plurality of support pillars 3 extend around the periphery of the base portion 2, an air flow port 3 a is formed between the support pillars 3, and the lighting unit 5 is attached to the lower end of the support pillar 3. The illuminating unit 5 is internally provided with a light source (not shown) such as an LED and is covered with an illuminating cover 5a to form an annular portion having a cylindrical hollow portion 5b. The illumination cover 5a is formed of a light-transmissive resin or the like, and the lower surface thereof is formed in a flat polygonal cross section.

The impeller 20 is disposed in the cavity 5b with its upper and lower ends substantially aligned with the upper and lower surfaces of the illumination unit 5. By forming the illumination unit 5 in an annular shape and disposing the impeller 20 in the cavity 5b, it is possible to reduce the thickness and weight of the blower 1 and improve the design. The illumination unit 5 may be divided in the circumferential direction and arranged in an annular shape.

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

The blades 41 are radially arranged 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 straight vertical plane 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.

The opening ratio of the fan guard 40 is defined as (the area of the outer peripheral region-the area of the outer peripheral region shielded by the fan guard 40 in the outer peripheral region of the annular region on the outer peripheral side of the boss portion 20a of the opening 5c in the horizontal section on the blade 41). Area)/(area of outer peripheral region).

In addition, as shown in FIG. 1, the radius of the impeller 20 is R, and the length of the space 6 at a position of R/2 in the radial direction from the rotation axis C in the direction perpendicular to the mounting surface (ceiling surface L) is shown. D1, the length in the direction perpendicular to the mounting surface (ceiling surface L) of the space 6 radially outward of R/2 from the rotation axis C, D2, the lower end of the impeller 20 and the upper surface of the fan guard 40. The distance from and is D3. At this time, the base portion 2, the impeller 20 and the fan guard 40 are arranged so as to satisfy the expressions (1), (2) and (3).

D1/R≧0.07 (1)
D2≧D1 (2)
D3/R≦0.08 (3)
Since the peripheral part of the base part 2 is formed as an inclined surface, the length D2 increases as it goes to the outer peripheral side, and it is clear that the formula (2) is satisfied. In addition, in FIG. 1, since the length D2 varies depending on the peripheral portion of the base portion 2 including the inclined surface, the maximum value (D2max) of the length D2 is shown.

FIG. 4 shows an exploded perspective view of the base portion 2 and the motor portion 11. FIG. 5 shows a perspective view of the motor unit 11 as seen from above. In the motor unit 11, the motor 12 is housed inside a motor cover 13, and a flange unit 13a having a plurality of Dharma holes 13b is formed on the upper surface of the motor cover 13. A vibration damping member (not shown) such as rubber is arranged on the upper surface of the flange portion 13a. On the lower surface of the base portion 2, a plurality of locking bolts 2c, which are inserted into the dharma holes 13b, are attached.

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

As a result, the motor portion 11 is temporarily fixed by the locking bolt 2c before being fixed. Therefore, it is possible to prevent the motor unit 11 from falling off even if the operator releases his hand during the work of mounting the motor unit 11. Therefore, the number of assembling steps and the dismantling property of the blower 1 can be improved.

Incidentally, as shown in the front sectional view of the main part in FIG. 6, the motor portion 11 may be temporarily fixed by the snap lock 15. That is, the hook portion 15a and the ring portion 15b of the snap lock 15 are provided in the base portion 2 and the flange portion 13a, respectively, and the insertion hole 13c of the hook portion 15a is provided in 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 of 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 friction between the vibration 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 sectional view of the main part in FIG. 7, the electric connection between the motor 12 and the base portion 2 may be made by the compression connector 16. That is, the terminal plate 12c to which the lead wire 12b (see FIG. 5) of the motor 12 is connected is provided on the motor cover 13, and the compression connector 16 is attached to the base portion 2.

When the motor portion 11 is attached to the base portion 2, the terminal plate 12c comes into contact with the elastic terminal 16a of the compression connector 16. As a result, it is possible to avoid the mounting work in the state where the motor portion 11 is hung down by the lead wire 12b, and it is possible to further improve the mountability of the motor portion 11.

In the blower 1 having the above configuration, when the lighting unit 5 is turned on, the room is illuminated. When the impeller 20 rotates in the positive direction indicated by the arrow G by driving the motor 12, the air in the room is supplied to the intake side of the impeller 20 through the circulation port 3a as indicated by the arrow K1 (see FIG. 1). .. The air is passed by the impeller 20 through the fan guard 40 as shown by an arrow K2 (see FIG. 1) and is discharged downward from the opening 5c. Thereby, the air circulation in the room is performed.

<Second Embodiment>
Next, FIG. 8 shows a front sectional view of the blower 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 are given the same reference numerals. In this embodiment, the shape of the base portion 2 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The base portion 2 is covered with a cylindrical base cover 2b 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, similarly to the first embodiment, the base portion 2, the impeller 20 and the fan guard 40 are arranged so as to satisfy the above-mentioned formulas (1), (2) and (3).

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

<Third Embodiment>
Next, FIG. 9 shows a front sectional view of the blower 1 of the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 are given the same reference numerals. In this embodiment, the shape of the base portion 2 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The base portion 2 is covered with a cylindrical base cover 2b having a diameter larger 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 this time, similarly to the first embodiment, the base portion 2, the impeller 20 and the fan guard 40 are arranged so as to satisfy the above-mentioned formulas (1), (2) and (3).

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

Next, FIG. 10 is a diagram showing the relationship between the space 6 above the impeller 20 of the blower 1 of the first, second, and third embodiments and the air volume. In FIG. 10, the vertical axis represents the air volume (unit: m ³ /min), and the horizontal axis represents D1/R (no unit). In the figure, S1, S2, and S3 indicate the first, second, and third embodiments, respectively, and the fan guard 40 has an aperture ratio of about 100% and a distance D3 of 2 mm. In addition, the air volume is measured based on JIS C9601-1990.

FIG. 11 is a diagram 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 represents the minimum aperture ratio (unit: %), and the horizontal axis represents D1/R (no unit). In the figure, P1, P2, and P3 indicate the first, second, and third embodiments, respectively, and the distance D3 is 2 mm (D3/R=0.125).

When the area covered by the blades 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 flow port 3a while the impeller 20 rotates in the forward direction (arrow G). To do. At this time, the aperture ratio when the backflow phenomenon occurs is the minimum aperture ratio. The minimum aperture ratio is measured by shielding the openings 5c at predetermined intervals with a fan-shaped shielding jig and measuring the aperture ratio when the backflow phenomenon occurs.

According to FIG. 10, the air volume increases as D1/R increases, and when it becomes 0.16 or more, it is substantially saturated and reaches the maximum value. 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. Further, 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 condition P3 of the third embodiment.

The opening ratio of the fan guard 40 is set to 80% or more in order to obtain a desired air volume and air velocity. Therefore, it is possible to realize the blower 1 capable of preventing the backflow phenomenon with a large air volume by satisfying the above-described equations (1) and (2).

FIG. 12 is a diagram 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 represents the minimum aperture ratio (unit: %) and the air volume (unit: m ³ /min), and the horizontal axis represents D3/R (no unit). D1/R is 0.16, and the aperture ratio when measuring the air volume 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, when D3/R is 0.0125, the minimum aperture ratio is lower than about 75% in the worst condition P3 of the third embodiment. When the aperture ratio of the fan guard 40 is 80% or more, the backflow phenomenon can be prevented even when the minimum aperture ratio is increased by about 5 points as compared with when D3/R is 0.0125. Therefore, the backflow phenomenon can be reliably prevented by satisfying the equation (3) and setting D3/R to 0.08 (E2 in the figure) or less.

<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 are given the same reference numerals. In this embodiment, the shape of the blade 41 of the fan guard 40 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The blades 41 are radially arranged 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 vertical surface (hereinafter, may be referred to as “forward spiral shape”) in which the outer peripheral side is curved forward in the forward direction (arrow G direction) in the rotational direction. 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 direction centrifugal 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 as compared with the first embodiment.

Therefore, the minimum aperture ratio of the fan guard 40 can be made lower than that of the first embodiment, and the margin for the risk 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 are given the same reference numerals. In this embodiment, the shape of the blade 41 of the fan guard 40 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The blades 41 are radially arranged 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 vertical surface (hereinafter, may be referred to as “reverse spiral shape”) in which the outer peripheral side is curved backward in the positive direction (arrow G direction) in the rotational direction. 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, although the margin for the risk of occurrence of the backflow phenomenon is smaller than that in the first embodiment, the backflow phenomenon can be prevented by forming the aperture ratio to be 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 represents the wind speed (unit: m/s), and the horizontal axis represents the distance from the center (rotation axis C) (unit: mm). In the figure, "forward spiral" indicates the fourth embodiment, and "reverse spiral" indicates the fifth embodiment. Further, in the figure, “without fan guard” indicates a state in which the fan guard 40 is omitted for comparison.

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

According to the figure, the maximum wind speed is the same when the blade 41 has a forward spiral shape (fourth embodiment) and a reverse spiral shape (fifth embodiment). When the blade 41 has a forward spiral shape and a reverse spiral shape, the maximum wind speed is higher than that in the state in which the fan guard 40 is omitted due to the rectifying action of the fan guard 40.

Therefore, by providing the fan guard 40, the reaching distance of the airflow can be extended. At this time, when the fan guard 40 has an opening ratio close to 100%, the fan guard 40 is equivalent to the state in which the fan guard 40 is omitted. Therefore, the fan guard 40 having the opening ratio capable of obtaining a desired wind speed is arranged.

Further, the air volume at this time is 47 m ³ /min when the blade 41 has a forward spiral shape and 26 m ³ /min when the blade 41 has a reverse spiral shape. Therefore, not only the minimum aperture ratio, but also the forward spiral shape is more preferable than the reverse spiral shape from the viewpoint of securing the air volume.

<Sixth Embodiment>
Next, FIG. 16 is a bottom view showing a main part of the fan guard of the blower 1 of the sixth embodiment. 17 is a sectional view taken along line AA of FIG. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 are given the same reference numerals. In this embodiment, the shape of the blade 41 of the fan guard 40 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

Both end surfaces 41a, 41b of the blade 41 arranged radially 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 as inclined surfaces that are inclined downward at the inclination angle α1 in the forward direction of rotation (direction of arrow G) with respect to the vertical surface.

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

<Seventh Embodiment>
Next, FIG. 18 is a bottom view showing the main part of the fan guard of the blower 1 of the seventh embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 are given the same reference numerals. In this embodiment, the shape of the blade 42 of the fan guard 40 is different from that of the blade 41 of the first embodiment. Other parts are the same as those in the first embodiment.

A plurality of blades 42 are provided concentrically around the rotation axis C on a bridge portion 40c that bridges the ring portion 40a and the circular portion 40b of the fan guard 40. Both end surfaces of the blade 42 in the radial direction are formed as 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, the swirling airflow formed by the impeller 20 rotating in the positive direction (arrow G) is sent out along the blades 42. Therefore, the pressure loss of the fan guard 40 can be reduced as compared with the first embodiment. Therefore, the minimum aperture ratio of the fan guard 40 can be made lower than that of the first embodiment, and the margin for the risk of the backflow phenomenon can be increased.

<Eighth Embodiment>
Next, FIG. 19 is a bottom view showing the main part of the fan guard of the blower 1 of the eighth embodiment. 20 shows a cross-sectional view taken along the line BB of FIG. For convenience of explanation, the same parts as those in the above-described seventh embodiment shown in FIG. 18 are designated by the same reference numerals. In this embodiment, the shape of the blade 42 of the fan guard 40 is different from that of the seventh embodiment. Other parts are the same as in the seventh embodiment.

Both end surfaces 42a, 42b in the radial direction of the blade 42 arranged concentrically are formed as inclined surfaces which are inclined downward at the inclination angle α2 toward the outer peripheral side with respect to the vertical plane.

As a result, the end surfaces 42a and 42b of the blade 42 are formed along the air flow (arrow K4) whose downstream side is guided to the outer peripheral side by the centrifugal force due to the rotation of the impeller 20. Therefore, the pressure loss of the fan guard 40 can be made smaller than that in the seventh embodiment. Therefore, it is possible to further increase the air volume and increase the margin for the risk of occurrence of the backflow phenomenon.

Table 1 summarizes characteristic comparisons by the fan guard 40 of the blower 1 of the first, fourth, fifth, and seventh embodiments. For comparison, the state without the fan guard 40 is also shown (Comparative Example 1). In Table 1, the crossing angle indicates the angle at which the swirling airflow and the blades 41, 42 intersect in the horizontal plane. Further, the minimum aperture ratios are shown in the case of 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 the concentric shape, the air volume is large and the minimum aperture ratio is small, so that the blades 41 and 42 have good characteristics. Next, when the blade 41 is linear, the characteristics of the air volume and the minimum aperture ratio are high. Further, when the blade 41 has an inverse spiral shape, the characteristics of the air volume and the minimum aperture ratio are lower than those of the straight shape, the forward spiral shape and the concentric shape.

<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 are given the same reference numerals. The present embodiment is different from the first embodiment in the configuration of the fan guard 40. Other parts are the same as those in the first embodiment.

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

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

As a result, the backflow phenomenon can be intentionally generated while 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 exposed to the air, and the comfort is reduced. At this time, if the specification is such that the rotation direction of the motor 12 (see FIG. 5) can be reversed, the cost of motor control increases. Further, the fixing structure of the impeller 20 becomes complicated because the fixing screw 21 (see FIG. 3) may come off due to loosening. Therefore, by rotating the movable portion 44 to cause a reverse rotation phenomenon, the blowing direction of the blower 1 can be changed with an inexpensive structure to improve comfort.

<Tenth Embodiment>
Next, FIG. 23, FIG. 24, and FIG. 25 are a perspective view, a front sectional view, and a side sectional view showing the mounting portion 22 including the boss portion 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 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. Other parts are the same as those in the first embodiment. Although not shown in these drawings, a plurality of blades are provided on the outer peripheral surface of the boss portion 20a.

A pin 23 protruding vertically to the axial direction is attached to the motor shaft 12a of the motor 12. A fitting hole (not shown), into which the motor shaft 12a is fitted, passes through the rotation shaft C of the boss portion 20a. A V-shaped taper groove 20d extending in one direction is formed on the upper surface of the boss portion 20a. A recess 20b having a rectangular shape in 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 positions around the fitting hole on the seat surface of the recess 20b.

A pair of blade fixing members 24 is provided, and has a shaft portion 24d that horizontally protrudes from an extending portion 24e that extends in a direction toward each other. The blade fixing member 24 is rotatably arranged by fitting a hole (not shown) formed in the inner wall of the recess 20b and the shaft 24d. A lower end of the blade fixing member 24 is provided with a gripping portion 24a which projects from the lower surface of the boss portion 20a and extends outward. A compression spring 25 for urging the holding portion 24a toward the outer peripheral side is arranged between the two holding portions 24a. The blade fixing member 24 is restricted from pivoting in the direction in which the gripping portion 24a separates by contacting the upper surface of the extending portion 24e with the seating surface of the recess 20b.

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

In the blower 1 having the above configuration, the motor shaft 12a is inserted into the fitting hole with the direction of the pin 23 and the direction of the tapered groove 20d aligned when the impeller 20 is attached. As shown in FIG. 26, when the pin 23 comes into contact with the engaging claw 24c, the upper surface of the engaging claw 24c is formed into an inclined surface, so that the blade fixing member 24 rotates in the direction in which both the engaging claws 24c separate.

Then, as shown in FIG. 24, when the pin 23 comes into contact with the lower end of the taper groove 24d, the engagement claw 24c is engaged with the pin 23 by the bias of the compression spring 25. As a result, the boss portion 20a is biased by the compression spring 25 in the direction in which it is pressed against the pin 23, and the impeller 20 is held by the motor shaft 12a. By driving the motor 12, the impeller 20 rotates integrally with the motor shaft 12a.

When both gripping portions 24a are gripped in a direction in which they approach each other against the urging force of the compression spring 25, the engagement between the engaging claw 24c and the pin 23 is released. Then, the impeller 20 can be removed by pulling it downward while holding the holding portion 24a.

According to the present embodiment, the pin 23 is positioned so as to be engaged with the taper groove 20d, and the rotational force of the motor 12 is received by the taper groove 20d, so that the engaging claw 24c is not applied with force. Further, since the lift of the impeller 20 is suppressed by the tip end surface of the engaging claw 24c, the force does not act directly on the compression spring 25 arranged in the horizontal direction. Therefore, 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 when attaching and detaching the impeller 20 can be improved. In addition, even if the motor 12 is rotated in the direction opposite to the forward direction indicated by the arrow G (see FIG. 2 ), the impeller 20 can be prevented from falling off, and the blowing direction can be changed according to the indoor environment. it can.

<Eleventh Embodiment>
Next, FIG. 27, FIG. 28, and FIG. 29 are a perspective view from above and a perspective view from below of the mounting portion 32 including the boss portion 20a of the impeller 20 (see FIG. 1) of the blower 1 of the eleventh embodiment. The figure and an exploded perspective view are shown. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 7 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. Other parts are the same as those in the first embodiment. Although not shown in these drawings, a plurality of blades are provided on the outer peripheral surface of the boss portion 20a.

A through hole 20h penetrating in the axial direction is provided in the boss portion 20a, and a plurality of ribs 20j extending in the axial direction are arranged side by side 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 with the inner side lowered, and the lower surface of the rib 20j is arranged above the lower surface of the boss portion 20a. A flange portion 20k protruding in the radial direction is formed at the lower end of the boss portion 20a.

The shaft support portion 34 is inserted into the through hole 20h of the boss portion 20a. 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 ribs 34b extending in the axial direction are arranged side by side in the circumferential direction on the circumferential surface. The rib 34b is arranged between the ribs 20j of the boss portion 20a.

A flange portion 34e protruding in the radial direction is provided at the lower end of the shaft support portion 34. The compression spring 35 is arranged 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 portion 20a is biased upward with respect to the shaft support portion 34. An annular groove portion 34d is formed at the upper end of the shaft support portion 34, and the restraint ring 37 arranged in the groove portion 34d contacts the upper surface of the rib 20j to prevent the boss portion 20a from coming off.

A plurality of tapered holes 34c into which the balls 36 are fitted are opened in the peripheral surface between the ribs 34b of the shaft support portion 34. The tapered hole 34c is formed in a narrow tapered shape on the fitting hole 34a side, and has a size such that the ball 36 does not drop into the fitting hole 34a. Further, the balls 36 arranged in the tapered holes 34c are prevented from falling out by the ribs 20j of the boss portion 20a.

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

In the blower 1 having the above configuration, the boss portion 20a and the flange portions 20k and 34e of the shaft support portion 34 are gripped when the impeller 20 is attached, and are brought close to each other against the biasing force of the compression spring 35. As a result, the ball 36 is arranged above the upper surface of the rib 20j. Next, when the motor shaft 12a is inserted into the fitting hole 34a, the ball 36 is retracted to the outer peripheral side, and the lower end of the motor shaft 12a is arranged below the ball 36.

Next, when the fingers are released from the flange portion 34e, the boss portion 20a is urged upward by the compression spring 35 with respect to the flange portion 34e. At this time, since the ball 36 contacts the motor shaft 12a, it projects from the tapered hole 34c to the outer peripheral side and maintains the state of being arranged on the rib 20j. Then, as shown in FIG. 30, when the groove portion 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 into the groove portion 12e. At this time, the inner peripheral surface of the rib 20j prevents the ball 36 from falling off.

Then, the pin provided on the motor shaft 12a and the groove provided on the boss portion 20a are engaged with each other, and the impeller 20 rotates integrally with the motor shaft 12a when the motor 12 is driven.

Further, when the impeller 20 is removed, if the flange portion 20k of the boss portion 20a is pulled downward, the ball 36 is arranged above the rib 20j. When the boss portion 20a is further pulled, the ball 36 is pushed out to the outer peripheral side by the motor shaft 12a, and the impeller 20 can be pulled out from the motor shaft 12a and removed.

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

<Twelfth Embodiment>
Next, FIG. 31 shows a front 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 are given the same reference numerals. In this 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 when viewed from below) indicated by the arrow G (see FIG. 2 ). Other parts are the same as those in the first embodiment.

The wind direction plate 7 is rotatably provided. When the impeller 20 rotates in the forward direction by driving the motor 12 (see FIG. 5 ), the air in the room is supplied to the impeller 20 via the circulation port 3a as indicated by the arrow K1. When the wind direction plate 7 is inclined at a small angle with respect to the vertical, a downward blown state in which air is blown downward from the opening 5c as shown by an arrow K2. Further, when the wind direction plate 7 is tilted at a large angle with respect to the vertical, a horizontal blowing state is achieved in which the air is blown from the opening 5c in a substantially horizontal direction.

When the impeller 20 rotates in the opposite direction, the air in the room is supplied to the impeller 20 through the opening 5c as indicated by the arrow K11. The air is blown upward from the circulation port 3a as shown by an arrow K12, and is in an upward blowing state.

FIG. 32 shows the state of the air flow in the room at the time of downward blowing. The blower 1 is attached to the center of the ceiling surface L of the room R. The airflow blown downward from the opening 5c of the blower 1 reaches the floor surface Z and then flows along the floor surface Z as shown by an 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 airflow flows along the floor surface Z, the air near the floor surface Z can be efficiently diffused.

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

However, if the wind speed of the air flow sent from the blower 1 is too high, the indoor user may feel the wind and become uncomfortable. On the other hand, if the wind velocity of the air flow is too low, it is difficult to obtain a comfortable environment because the temperature distribution in the room is not eliminated. Therefore, it is necessary to set an appropriate wind speed.

At this time, the influence of the temperature distribution and the wind hitting the user also influences the size of the room R and the blowing direction. Therefore, the wind speed at the time of blowing out is v (m/s), the distance from the outlet (opening 5c) to the floor surface Z is b (m), and the angle of the air flow with respect to the horizontal plane is θ (°). F was defined as shown in equation (4). Here, since it is downward blowing, the delivery range H1 is set to a 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 so as to satisfy 0.1≦F≦100, it is possible to prevent user discomfort from the results of the temperature distribution measurement and the sensation test and obtain a comfortable indoor environment. Was found.

FIG. 33 shows an example of measuring the temperature distribution during 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 changed by changing the wind speed v with the distance b=2 m and the sending angle θ=70°.

The size of the room R is 8 tatami mats, and the temperature during heating operation by the air conditioner is measured. A plurality of temperature measuring points are provided in the room, each being 5 cm outside from each side wall W, and the difference between the highest temperature and the lowest temperature is the temperature difference ΔT. Before driving the electric fan 10 of the blower 1, the temperature near the ceiling was the highest and the temperature near the floor was the lowest, and the temperature difference at this time was about 9°C.

According to the figure, when the installation 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, when F<0.1, the wind does not reach the floor surface Z and the temperature unevenness cannot be eliminated because the wind speed v is small, the distance b is large, or the delivery angle θ is small.

Further, when the installation function F exceeds 100, the wind hitting the user becomes strong, so that the environment is uncomfortable for the user. That is, when F≧100, the wind speed v is high, the distance b is short, or the delivery angle θ is large, so that the wind blows strongly on the user's feet, resulting in an uncomfortable 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 at the time of upward blowing. When the impeller 20 rotates in the opposite direction by rotating the motor 12 in the reverse direction of the downward blowing, the air blown upward from the blower 1 flows along the ceiling surface L as indicated by the arrow K15. Then, the airflow moves downward along the side wall W, flows on the floor surface Z, rises in the central portion of the room R, and is guided to the opening 5c (see FIG. 31). Thereby, the air on the ceiling surface L can be efficiently diffused.

For example, when heating operation is performed by an air conditioner or the like in winter, warm air is likely to be accumulated on the ceiling surface L. At this time, warm air can be delivered to the lower part 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.

Further, since the entire room R including the floor surface Z and the lower part of the side wall W is warmed, the temperature setting can be set low. Thereby, energy saving can be achieved. In addition, since the indoor user is not directly exposed to the wind, there is no discomfort and it is possible to eliminate uneven temperature distribution.

Also, usually in summer, downward blowing is performed to make you feel cool with a pleasant breeze. However, when the user in the room feels cold during the cooling operation, the air is blown upward so that the air can be efficiently circulated without feeling the wind.

In the blower 1 having the above-described configuration, if the wind speed of the air flow sent from the blower 1 is too low, the air does not circulate, and the uneven temperature distribution in the room cannot be eliminated. On the other hand, if the wind speed of the airflow is too high, the user in the room may feel the wind and become uncomfortable.

Therefore, the wind speed at the time of blowing out is v (m/s), the distance from the opening 5c to the ceiling surface L is d (m), the delivery angle of the air flow with respect to the horizontal plane is θ (°), and the installation function F is expressed by It was defined as shown in 5). Here, since the air is blown upward, 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 so as to satisfy 1≦F≦100, the same temperature distribution measurement and sensation test results as described above prevent the user from feeling uncomfortable and create a comfortable indoor environment. can get.

FIG. 35 shows the state of the 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 from that at the time of downward blowing, and the airflow is sent out from the opening 5c of the blower 1 in a substantially horizontal direction. When the airflow sent out from the opening 5c reaches the side wall W, it flows downward along the side wall W as shown by an arrow K6. Then, the airflow circulates on the floor surface Z, rises in the central portion of the room R, and is guided to the circulation port 3a.

The horizontal blowing makes it difficult for the user to directly hit the wind, and is therefore suitable when the user is a woman, an elderly person, a sick person, an infant or the like. Further, by eliminating the uneven temperature distribution in the room during the heating operation in winter, it is possible to improve comfort and save energy. In addition, unlike the downward blowing, strong wind is not blown locally on the floor surface Z, so that dust on the floor surface is less likely to scatter, and unlike the upward blowing, the ceiling surface L is not blown, so that the dust on the ceiling surface 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 room temperature becomes higher by agitating the heated air in the ceiling in winter, and thus the upward blowing is preferable. On the other hand, in the summer, the indoor temperature rises due to the agitated heated air in the ceiling, so horizontal blowing is preferable.

Further, even during the cooling operation in the summer, the user can feel the soft wind, although it is difficult for the wind to hit directly, which is an effective measure against overcooling. In addition, by performing downward blowing during cooling operation and horizontal blowing when the user feels cold, it is possible to efficiently circulate air without feeling the wind. Therefore, a good indoor environment can be provided throughout the year including winter and summer.

In the blower 1 having the above-described configuration, if the wind speed of the air flow sent from the blower 1 is too low, the air does not circulate, and the uneven temperature distribution in the room cannot be eliminated. On the other hand, if the wind speed of the airflow is too high, the user in the room may feel the wind and become uncomfortable.

Therefore, the wind speed at the time of blowing out is v (m/s), the distance from the opening 5c to the floor surface Z is b (m), the delivery angle of the airflow with respect to the horizontal plane is θ (°), and the installation function F is expressed by It was defined as shown in 6). The sending angle θ is positive in the lower part and negative in the upper part. Here, since it is horizontal blowing, the delivery range H3 is set to a 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, the same temperature distribution measurement and sensation test results as described above prevent the user from feeling uncomfortable and create a comfortable room. The environment is obtained.

In the present embodiment, the blower 1 can perform the downward blow, the upward blow, and the horizontal blow, but the blower 1 performing either one or two may be installed and operated based on the installation function F.

Further, although the downward blowing and the horizontal blowing are switched by the wind direction plate 7, they may be switched by another configuration. For example, the fan guards 40 may be double provided, and one of them may be movable between the outside of the opening 5c and immediately below the opening 5c by a linear guide or the like. At this time, the delivery angle θ can be set by, for example, the inclination of the end surfaces 42a and 42b of the blade 42 of the fan guard 40 as shown in FIG. Further, the electric fan 10 itself may be rotatably formed so as to change the delivery direction like a fan.

Further, in the present embodiment, since the impeller 20 is rotated 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.

<Thirteenth Embodiment>
Next, FIG. 36 shows a front sectional view of the 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 are given the same reference numerals. In this 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. Other parts are the same as those in the first embodiment.

The inner peripheral surface of the illumination cover 5a of the illumination unit 5 is formed into a cylindrical surface, and its cross-sectional shape is formed into a substantially elliptical shape. The ion generator 50 is installed on an inclined surface formed on the peripheral portion of the lower surface of the base cover 2b that covers the base portion 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 having an AC waveform or an impulse waveform is applied. A positive voltage is applied to one electrode, and water molecules in the air are ionized by corona discharge to generate hydrogen ions. The hydrogen ions cluster with water molecules in the air due to the solvation energy. As a result, positive ions of air ions composed 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 oxygen molecules or water molecules in the air are ionized by corona discharge to generate oxygen ions. The oxygen ions cluster with water molecules in the air due to the solvation energy. As a result, negative air ions of O ₂ ⁻ (H ₂ O)n (n is an arbitrary natural number) are released.

H ⁺ (H ₂ O)m and O ₂ ^- (H ₂ O)n aggregate on the surface of airborne bacteria and odorous components and surround them. Then, as shown in the formulas (8) to (10), the active species [.OH] (hydroxyl radical) and H ₂ O ₂ (hydrogen peroxide) are aggregated and produced on the surface of the microorganism by collision. Destroy floating bacteria and odorous components. Here, m′ and n′ are arbitrary natural numbers. Therefore, the interior of the room can be sterilized and the odor can be removed by sending the air flow containing positive ions and negative ions emitted from the ion generator 50 toward the space 6 through the opening 5c.

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 ion ejection direction is a direction orthogonal to the plane when the electrode is a flat surface, and a direction parallel to the extending direction of the electrode when the electrode is a needle. The ions released from the ion generator 50 are included in the air flowing into the flow port 3a as shown by the arrow K1. Thereby, the air flow sent out from the opening 5c can easily include ions.

<Fourteenth Embodiment>
Next, FIG. 37 shows a front sectional view of the blower 1 of the fourteenth embodiment. For convenience of explanation, the same parts as those in the thirteenth embodiment shown in FIG. 36 described above are denoted by the same reference numerals. In this embodiment, the shape of the base portion 2 is different from that of the thirteenth embodiment. Other parts are the same as in the thirteenth embodiment.

The base portion 2 is covered with a cylindrical base cover 2b having a diameter larger than that of the impeller 20 as in the third embodiment. The ion generator 50 is arranged around the base portion 2 and emits ions substantially vertically downward. Thereby, as in the thirteenth embodiment, the airflow sent out from the opening 5c can easily include ions.

<Fifteenth Embodiment>
Next, FIG. 38 shows a front sectional view of the blower 1 of the fifteenth embodiment. For convenience of explanation, the same parts as those of the fourteenth embodiment shown in FIG. 37 described above are denoted by the same reference numerals. This embodiment is different from the fourteenth embodiment in the arrangement of the ion generator 50. Other parts are the same as in the fourteenth embodiment.

The ion generator 50 is attached to the support column 3 and emits ions in a direction along the airflow flowing from the flow port 3a. As a result, ions can be easily included in the air flow delivered from the opening 5c. 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 the ions in a direction parallel to the airflow guided to the impeller 20 from the flow port 3a, because it is possible to reduce disappearance due to collision of the ions.

<Sixteenth Embodiment>
Next, FIG. 39 shows a front sectional view of the blower 1 of the sixteenth embodiment. For convenience of explanation, the same parts as those of the fourteenth embodiment shown in FIG. 37 described above are denoted by the same reference numerals. This embodiment is different from the fourteenth embodiment in the arrangement of the ion generator 50. 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, the air flow sent out from the opening 5c can easily include ions.

Next, in the blower 1 of the fourteenth to sixteenth embodiments, the wind speed of the airflow passing through the circulation port 3a was measured. The radius R of the impeller 20 is 160 mm, the diameter of the opening 5c 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 on 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 column 3 was 1.8 m/s. The wind speed on the upper surface of the illumination unit 5 was 1.1 m/s.

It is generally known that ions are widely diffused when they are ejected to a place where the flow velocity of air is high. For this reason, it is more desirable to dispose the ion generator 50 on the support 3 (15th embodiment) more uniformly than to dispose the ion generator 50 on the upper surface of the illumination unit 5 (16th embodiment). Further, it is more desirable to dispose the ion generator 50 on the lower surface of the base portion 2 (14th embodiment) than to dispose the ion generator 50 on the support column 3 (15th embodiment) because ions can be uniformly delivered. ..

In the present embodiment, the air flow containing positive ions and negative ions is sent from the blower 1, but the air flow containing either one of the ions may be sent. Thus, the electric charges of the ions can remove the electric potential of the object to be attached that floats in the room space. Also, the ion balance of the indoor space can be adjusted.

Further, the ion generator 50 may be a device that generates charged fine particle water containing a radical component, for example.

Although the blower including the annular illumination unit 5 is described in the first to sixteenth embodiments, the same is true for the blower 1 including the annular annular portion having the hollow portion 5b in which the impeller 20 is arranged. Similar effects can be obtained depending on the configuration.

[Appendix 1]
One aspect of the present invention includes a base portion that is attached to a ceiling surface in a room, a motor that is fixed to the base portion, and an impeller that is rotated by a rotation axis perpendicular to a mounting surface of the base portion by the motor. An electric fan that has, an annular portion that is formed in an annular shape having a cylindrical hollow portion in which the impeller is arranged and that is formed by forming an air flow port between the ceiling surface and a plurality of blades A fan guard having a fan guard disposed on the lower end surface of the hollow portion and blowing downward when the impeller rotates in a predetermined positive direction, wherein the upper and lower ends of the impeller are the annular portions. Of the impeller, the radius of the impeller is R, and the radius of the impeller is R/2 in the radial direction from the rotation axis and is perpendicular to the mounting surface in the space above the impeller. Let D1 be the length in the direction and D2 be the length in the direction perpendicular to the mounting surface in the space above the impeller on the outer peripheral side of R/2 in the radial direction from the rotation axis. It is characterized in that /R≧0.07 and D2≧D1 are satisfied.

According to the above configuration, the radius of the impeller is R, the length of the space above the impeller at the position of R/2 in the radial direction from the rotary shaft in the direction perpendicular to the mounting surface is D1, and the radius from the rotary shaft is D1/R≧0.07 and D2≧D1 are satisfied, where D2 is the length of the space above the impeller on the outer peripheral side of R/2 in the direction perpendicular to the mounting surface. As a result, a large air volume can be obtained, the backflow phenomenon can be prevented, and the air circulation in the room can be normally performed.

Further, one aspect of the present invention is characterized in that, in the blower having the above structure, when a distance between a lower end of the impeller and an upper surface of the fan guard is D3, D3/R≦0.08 is satisfied. Thereby, the backflow phenomenon can be prevented and the air circulation in the room can be normally performed.

Further, according to an aspect of the present invention, in the blower having the above-mentioned configuration, the plurality of blades are radially arranged, and both end surfaces in the circumferential direction of the blades are straight or curved lines in which the outer peripheral side is curved forward in the positive direction rotational direction. It is characterized in that it is formed into a shape.

Another aspect of the present invention is characterized in that, in the blower having the above structure, the plurality of blades are concentrically arranged.

Further, according to one aspect of the present invention, in the blower having the above structure, the annular portion is an illumination portion for performing illumination.

Further, according to one aspect of the present invention, a base portion mounted on a ceiling surface in a room, a motor fixed to the base portion, and an impeller that is rotated by a rotation axis perpendicular to a mounting surface of the base portion by the motor. A plurality of electric fans, and an annular portion that is formed in an annular shape having a cylindrical hollow portion in which the impeller is arranged and that is formed by forming an air flow port between the ceiling surface and A fan having a blade and a fan guard arranged on the lower end surface of the hollow portion, and blowing air downward when the impeller rotates forward, wherein the upper and lower ends of the impeller are the upper and lower surfaces of the annular portion. When 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. It has a feature.

Further, according to one aspect of the present invention, a base portion mounted on a ceiling surface in a room, a motor fixed to the base portion, and an impeller that is rotated by a rotation axis perpendicular to a mounting surface of the base portion by the motor. And an annular portion formed in an annular shape having a cylindrical hollow portion in which the impeller is arranged and having an air flow port formed between the impeller and the ceiling surface and attached to the base portion. In the blower that blows downward when the impeller rotates in a predetermined forward direction, the base portion internally houses a power supply board and a drive board of the electric fan, and is covered by a base cover. An inclined surface is formed on a surface facing the fan so as to become lower as it is closer to the rotation axis of the impeller, a plurality of columns extend around the base portion, and the circulation port is formed between the columns, The annular portion is attached to the lower end of the support column, and the lower end of the support column is lower than the upper end of the impeller.

INDUSTRIAL APPLICABILITY According to the present invention, it can be used for a blower installed on a ceiling surface in a room to circulate air.

[Appendix 2]
However, according to the above-mentioned conventional blower, since the illumination unit is arranged 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 air pressure loss. At this time, a backflow phenomenon may occur in which air flows from the opening toward the flow port while the impeller rotates in the forward direction. Therefore, there is a problem that the air circulation in the room cannot be normally performed.

An object of the invention according to one aspect of the present invention is to provide a blower capable of preventing a backflow phenomenon and normally performing air circulation in a room.

According to one aspect of the present invention, a base portion mounted on a ceiling surface in a room, an electric fan having an impeller rotated by a motor on a rotation axis perpendicular to a mounting surface of the base portion, and the base portion. And a base cover in which a sloped surface is formed on a surface facing the impeller, the slope becoming higher with respect to the ceiling surface as it approaches the rotation axis of the impeller, and a cylindrical shape in which the impeller is arranged. An illumination unit that is formed in an annular shape having a hollow portion and that forms an air flow opening between the ceiling surface and performs illumination, and the impeller has a predetermined positive direction and the positive direction. It is configured to be rotatable in the opposite direction and to change the air blowing direction.

According to the invention of one embodiment of the present invention, a backflow phenomenon can be prevented and normal air circulation in a room can be performed.

A blower according to one aspect of the present invention includes a base portion mounted on a ceiling surface in a room, an electric fan having an impeller that is rotated by a motor on a rotation axis perpendicular to a mounting surface of the base portion, and an impeller. And a light-transmitting resin that covers the lighting portion, which is formed in an annular shape having a cylindrical hollow portion, and which has an LED for performing lighting by forming an air flow port between the ceiling surface and the ceiling surface. The illumination cover formed in 1. is provided, and the impeller can be rotated in a predetermined positive direction and in a direction opposite to the normal direction, and the blowing direction can be changed upward and downward.

1 Blower 2 Base part 2a Attachment member 2b Base cover 2c Locking bolt 3 Strut 5 Lighting part 5a Lighting cover 5b Cavity part 5c Opening part 6 Space 7 Wind vane 10 Electric fan 11 Motor part 12 Motor 12a Motor shaft 12b Lead wire 13 Motor Cover 13b Dharma hole 15 Snap lock 16 Compression connector 20 Impeller 20a Boss portions 20b, 20h Through hole 20c Recessed portion 20d Tapered groove 20j, 34b Rib 20k, 34e Flange portion 21 Fixing screw 22, 32 Mounting portion 23 Pin 24 Blade fixing member 24a Grasping part 24b Lever part 24c Engaging claw 25, 35 Compression spring 34 Shaft support part 34a Fitting hole 34c Tapered hole 36 Ball 37 Restraint ring 40 Fan guard 41, 42, 45 Blade 43 Fixed part 44 Movable part 50 Ion generator

Claims (4)

With a base part that can be attached to the ceiling surface
An electric fan having an impeller rotated by a motor,
A base cover that covers the base portion and that arranges the electric fan below the ceiling surface;
An illumination unit that is formed in an annular shape having a cylindrical hollow portion in which the impeller is arranged and that has an LED for performing illumination by forming an air flow port between the impeller and the ceiling surface;
Delivery direction of the air current generated by the electric fan, viewed contains an inclined direction inclined to the ceiling surface,
In the electric fan, the rotation axis of the impeller is tiltable with respect to the vertical direction, and the electric fan is rotatable so as to change the delivery direction.
It further comprises a plurality of pillars that connect the upper surface of the lighting section and the base section and form the air circulation port, and the connection point between the plurality of pillars and the lighting section is higher than the upper end of the impeller. Located below,
Blower. The flow direction of the airflow generated by the electric fan can be switched between a vertical direction perpendicular to the ceiling surface and the tilt direction.
The blower according to claim 1. An angle formed by the tilt direction and the vertical direction is smaller than 60°,
The blower according to claim 1 or 2. The impeller is rotatable in a predetermined positive direction and in a direction opposite to the positive direction.
Blower according to any one of claims 1-3.

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