JP6664126B2 - Blower - Google Patents

Description

  The present invention relates to a blower, and more particularly to a blower (fan) that can blow air to a space such as a room and can be used as a fan, a circulator, and the like.

  Japanese Unexamined Utility Model Publication No. 7-14194 (Patent Document 1) discloses a blower (fan) capable of sending wind to 360 degrees around. In this blower, blades are arranged inside a vertical housing, and by rotating the blades, air is taken into the housing from an intake port below the housing, and this air is discharged from an exhaust port above the housing to the surroundings 360. It discharges frequently.

Japanese Utility Model Publication No. 7-14194

  However, the blower of Patent Document 1 has a problem that the air volume is weak because the air taken in from the lower intake port is dispersed 360 degrees around from the upper exhaust port. Even if the rotation speed of the blades is increased to increase the air volume with this blower, the air volume discharged from the exhaust port is the same as the air volume taken in from the lower intake port.

  Therefore, an object of the present invention is to provide a blower that can increase the air volume without increasing the rotation speed of the blade.

  According to an embodiment of the present invention, there is provided a housing having a first intake port and an exhaust port, wherein the housing defines an air passage through which air flows from the first intake port to the exhaust port. (1) At least two blades arranged between an intake port and an exhaust port in an air passage direction in which air passes through an air passage at intervals, and by rotating, air flows from upstream to downstream in the air passage direction. At least two blades for feeding, and a rotation drive source for rotating the at least two blades, wherein the housing is intermediate between each of the at least two blades adjacent to each other in the air passing direction. An air blower having an air inlet is provided.

  In the present invention, by rotating at least two blades in a predetermined direction by a rotary drive source, air is taken into the housing from each of the first intake port and one or more intermediate intake ports, and the air is removed from the air in the housing. The passage can be sent downstream in the air passage direction and discharged from the exhaust port. In the present invention, the amount of air discharged from the exhaust port is substantially determined by the amount of air taken into the housing from the first intake port and the amount of air taken into the housing from one or more intermediate intake ports. Since it is possible to make the sum with the amount, the amount of air discharged from the exhaust port can be increased without increasing the rotation speed of each of the at least two blades. In this specification, a blower refers to a fan that can send out wind to a space such as a room, and can be used as a fan, a circulator for circulating air in a room or the like, and the like.

  In the present invention, at least two blades are arranged in the housing between the first intake port and the exhaust port at intervals in an air passage direction in which air passes through the air passage, and the housing is provided with the at least two blades. And an intermediate intake port between each two adjacent blades in the air passage direction. Therefore, in the case of two blades, only one intermediate intake port is provided between these two blades, and in the case of three blades, the intermediate intake port is provided between the most upstream blade and the intermediate blade in the air passing direction. And between the blade at the most downstream in the air passage direction and the intermediate blade, there are two in total.

  In one embodiment of the present invention, the at least two blades are configured such that an amount of air sent by a blade downstream of the air passage direction among the two blades adjacent in the air passage direction to the downstream (hereinafter, also referred to as “air feed amount”). ) Is set to be larger than the amount of air sent by the blades upstream in the air passage direction to the downstream side. In this case, of the two blades adjacent to each other in the air passage direction in the housing, the amount of air sent by the downstream blade in the air passage direction is larger than the amount of air sent by the upstream blade. Thereby, the air taken into the housing from the first intake port by the rotation of the most upstream blade in the air passage direction is prevented from leaking out of the housing from one or more intermediate intake ports as much as possible. The blades other than the blades additionally take in air into the housing from one or more intermediate intake ports, and merge the air taken into the housing from each of the first intake port and one or more intermediate intake ports to pass the air. Direction can be sent downstream. As a mode of increasing the air feed amount of each of the upstream blade and the downstream blade adjacent to each other in the air passing direction in the housing in the housing, the pitch angle of the downstream blade is set to the pitch of the upstream blade as described later. Examples include, but are not limited to, making the pitch angle larger than the pitch angle and making the rotation speed of the downstream blade higher than the rotation speed of the upstream blade.

  In one embodiment of the present invention, the at least two blades have the same diameter, and a pitch angle of a blade downstream of the air passage direction among two blades adjacent to each other in the air passage direction is upstream of the air passage direction. It is set to be larger than the pitch angle of the blade. The pitch angle is the inclination of each blade with respect to the rotation plane (the plane perpendicular to the air passage direction). In this case, at the same rotational speed, the amount of air sent by the blade downstream of the air passage direction having the larger pitch angle is larger than the amount of air sent by the blade upstream of the air passage direction having the smaller pitch angle. Thereby, the most upstream blade in the air passage direction can be prevented from leaking the air taken into the housing from the first intake port to the outside of the housing from the one or more intermediate intake ports as much as possible by the rotation of the most upstream blade in the air passage direction. The air that has been taken into the housing from each of the first intake port and the one or more intermediate intake ports is merged while additionally introducing air into the housing from the one or more intermediate intake ports by the blades other than the air passage direction. Can be sent downstream.

  In one embodiment of the present invention, the at least two blades include a first blade upstream and a second blade downstream in the air passage direction. In this case, only one intermediate intake port is formed between the first blade and the second blade.

  In one embodiment of the present invention, the housing has a cylindrical shape whose axis extends in the vertical direction, and the exhaust port opens 360 degrees in a circumferential direction with respect to the axis of the housing. In this case, the air passage extends substantially in the vertical direction (axial direction of the housing), and the air taken into the housing from the first intake port and the intermediate intake port flows vertically in the housing, and flows from the exhaust port to the housing. Is discharged over 360 degrees in the circumferential direction with respect to the axis of. The first intake port and the intermediate intake port can also be opened at 360 degrees in the circumferential direction.

  In one embodiment of the present invention, the air conditioner further includes an airflow direction conversion unit for directing the air flowing in the housing in one of the up and down directions to the exhaust port that opens at 360 degrees in the circumferential direction. In this case, the direction of the air flowing in the housing in one of the up and down directions toward the exhaust port is changed by the air flow direction conversion unit so as to be directed toward the exhaust port, so that the air is smoothly exhausted from the exhaust port to 360 degrees around. be able to.

  In one embodiment of the present invention, the air flow redirection portion includes a conical surface, and the conical surface is located at an initial position where the amount of air discharged from the exhaust port is uniform over 360 degrees in the circumferential direction. And an inclined position where the amount of air exhausted from the exhaust port becomes uneven over 360 degrees in the circumferential direction. In this configuration, when the conical surface of the air flow redirector is in the initial position, the air is substantially uniformly discharged from the exhaust port over 360 degrees around the circumference. On the other hand, when the conical surface of the airflow redirection unit is in the inclined position, the amount of air discharged from the exhaust port becomes non-uniform at 360 degrees around, and the air volume becomes maximum at a certain point in the circumferential direction. However, the air volume is minimum at a point diametrically opposite to this point. The “tilt position” is not limited to one fixed position, but may be a plurality or various positions that change continuously or stepwise.

  In the present invention, the rotary drive source may be common to at least two blades, or may be separately provided for each blade. When the rotary drive source is shared by a plurality of blades, the manufacturing cost of the blower can be reduced. When a rotary drive source is provided for each blade, on / off control can be performed for each blade in addition to changing the rotation speed. Examples of the rotary drive source include a motor such as a DC motor.

  In one embodiment of the present invention, the housing includes a side portion on which the first intake port, the exhaust port, and the intermediate intake port are opened, and the side portion includes a portion other than the first intake port, the exhaust port, and the intermediate intake port. Including a covering cover, the opening area of the first intake port and / or the exhaust port and / or the intermediate intake port can be changed by shifting the cover. In this case, by displacing the cover on the side of the housing, the opening area of the first intake port and / or the exhaust port and / or the intermediate intake port can be changed as desired, and the amount of air flowing out of the exhaust port can be adjusted. Become. It is considered that it is desirable that the total opening area of all the intermediate intake ports be smaller than the opening area of the first intake port, but the present invention is not limited to this.

  In the present invention, the amount of air released from the exhaust port of the housing is substantially the amount of air taken into the housing from the first intake port and the amount of air taken into the housing from one or more intermediate intake ports. Since the sum of the air amount and the air amount can be obtained, the amount of air discharged from the exhaust port can be increased as compared with the case where only one air inlet is provided, without increasing the rotation speed of at least two blades.

FIG. 1 is a perspective view schematically showing a blower according to one embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional explanatory view of the blower of FIG. FIG. 3 is a perspective view schematically showing the upper airflow redirection unit, and the upper airflow redirection unit is in an initial position. FIG. 4 is a perspective view of the upper airflow direction conversion unit in the inclined position. FIG. 5 is an explanatory plan view showing air discharged from the exhaust port to the periphery when the upper airflow direction conversion unit is at the initial position. FIG. 6 is an explanatory plan view showing air discharged from the exhaust port to the periphery when the upper airflow direction conversion unit is at the inclined position in FIG. 4. FIG. 7 is a chart showing the measured wind speed corresponding to the air feed amount of the first blade. FIG. 8 is a chart showing the measured wind speed corresponding to the air feed amount of the second blade. FIG. 9 is a table in which the first and second blades are arranged in a cylinder having no intermediate (second) air inlet, and the wind speed is measured. FIG. 10 is a chart in which the first and second blades are arranged in a cylinder provided with the same opening as the second intake port, and the wind speed is measured. FIG. 11 is a schematic explanatory diagram of a blower according to another embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to such an embodiment, and those skilled in the art will recognize the claims and equivalents to the exemplary embodiment. Changes and the like can be appropriately made within the range. FIG. 1 is a perspective view schematically showing a blower 1 according to one embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional explanatory view of the blower 1.

  The blower 1 includes a cylindrical housing 10 having a diameter of about 220 mm, a first blade 20 and a second blade 21 (see FIG. 2), which are two blades arranged in the housing 10, and a first and a second blade 21. A DC motor 29 (see FIG. 2), which is a common rotary drive source for the two blades 20 and 21, is provided. The DC motor 29 is connected to a not-shown commercial power supply and a battery. The battery can be arranged, for example, inside a lower air direction conversion unit 16 described later. The housing 10 is of a vertical type that is arranged on the floor surface so that its axis extends vertically. The first and second blades 20 and 21 are arranged at an interval of about 200 mm in the vertical direction (axial direction) in the housing 10. Each of the first and second blades 20, 21 has, for example, five blades 20a, 21a (see FIG. 7 and the like), for example, and has the same diameter of about 190 mm. However, the pitch angle of each blade 21a of the second blade 21 is set to be larger than the pitch angle of each blade 20a of the first blade 20. In the present example, as an example, the pitch angle of the second blade 21 is 45 degrees, and the pitch angle of the first blade 20 is about 30 degrees, but is not limited thereto. As a result, the amount of air sent by the second blade 21 becomes larger than the amount of air sent by the first blade 20 at the same rotation speed. In the present embodiment, the pitch angle is the inclination of the blades 20a, 21a of the first and second blades 20, 21 with respect to a plane (rotation plane) perpendicular to the axis of the housing 10. The housing 10 includes a disc-shaped top plate 11 and a bottom plate 12, and a peripheral side portion (side portion) 13 extending between the periphery of the top plate 11 and the periphery of the bottom plate 12. The blower 1 is used with the bottom plate 12 of the housing 10 arranged on the floor. Reference numeral 16 in FIG. 1 denotes a handle that is held by the user when lifting the blower 1, and is omitted in FIG. The vertical length of the peripheral side portion 13 of the housing 10 is longer than the diameters of the top plate 11 and the bottom plate 12.

  On the peripheral side portion 13 of the housing 10, a first intake port 30 is provided immediately above the bottom plate 12, and an exhaust port 31 is provided immediately below the top plate 11. Further, a second intake port 32 as an intermediate intake port is formed at a vertically intermediate portion of the peripheral side portion 13 of the housing 10. The first and second intake ports 30 and 32 and the exhaust port 31 are open at the peripheral side portion 13 in the circumferential direction with respect to the axis over 360 degrees. The peripheral side portion 13 of the housing 10 includes a base 13a formed of a vertical or horizontal frame made of metal or resin, and a non-breathable cover 13b that covers the base 13a. In regions corresponding to the first and second intake ports 30, 32 and the exhaust port 31, the cover 13b is removed and the base 13a is exposed, thereby forming respective openings. Therefore, it can be said that the cover 13b is divided into two, an upper cover 13b and a lower cover 13b. In the initial position of the cover 13b shown in FIGS. 1 and 2, the vertical opening of the first intake port 30 is 75 mm, and the vertical interval of the exhaust port 31 is 80 mm. Further, the interval between the vertical openings of the second intake port 32 is 50 mm. Therefore, the opening area of the second intake port 32 is smaller than the opening area of each of the first intake port 30 and the exhaust port 31. Also, the cover 13b which is separated vertically can be configured to be vertically displaced, and the opening areas of the first and second intake ports 30, 32 and the exhaust port 31 can be changed as desired. Can be. In this case, by displacing at least one of the upper and lower covers 13b, the opening area of the first and / or second intake ports 30, 32 and / or the exhaust port 31 is changed as desired, and the amount of air flowing out of the exhaust port 31 is adjusted. be able to. The upper and lower covers 13b are usually positioned such that the opening area of the second intake port 32 is smaller than the opening area of the first intake port 30.

  Inside the housing 10, air that takes in air taken into the housing 10 from the lower first intake port 30 to the upper exhaust port 31 by rotating the first and second blades 20 and 21 in a predetermined direction is provided inside the housing 10. A passage P (see FIG. 2) is defined. In the present embodiment, the air passage P substantially extends in the axial direction (vertical direction) of the housing 10. The air that has entered the housing 10 from the first intake port 30 flows through the air passage P from below, ie, upstream, to above, ie, downstream, and is then discharged from the exhaust port 31 over a 360 ° circumferential direction. Therefore, in the present embodiment, the “air passage direction” is the vertical direction in the housing, and the air is sent upward from below in the air passage direction.

  The first blade 20 is disposed immediately below the second air inlet 32 in the housing 10. The second blade 21 is disposed immediately above the second air inlet 32 in the housing 10. For this reason, in the present embodiment, the first and second blades 20 and 21 are spaced apart from each other in the housing 10 in the air passing direction by a distance (in the present embodiment, approximately 50 mm) in the vertical direction between the second intake ports 32. (About 200 mm).

  In this example, the DC motor 29 is a double-shaft motor in which both shafts serve as an output unit. The DC motor 29 is disposed between the first blade 20 and the second blade 21, and one output shaft of the DC motor 29 is connected to the second shaft. One blade 20 is connected to the other output shaft to the second blade 21. In the present embodiment, the DC motor 29 drives the first and second blades 20 and 21 at the same rotation speed (rotational speed). It is designed so that the rotation speed of the blades 20, 21 can be changed continuously or stepwise. Note that the DC motor 29 and the like are omitted in FIG. Although not shown, a motor that is not a dual-axis motor is disposed in a lower airflow direction conversion unit 16 described later, and the output shaft of the motor is extended upward along the axis of the housing 10 and is connected to the output shaft. The first and second blades 20, 21 may be fixed. By using one common motor as the rotation drive source for the first and second blades 20 and 21, the manufacturing cost of the blower 1 can be reduced as compared with the case where a motor is provided for each of the two blades.

  Below the top plate 11, the direction in which the air rises inside the housing 10 and approaches the exhaust port 31 is gradually changed from above the axial direction toward the outside of the housing 10 from the exhaust port 31 toward the outside in the radial direction with respect to the axis. An upper airflow direction conversion unit 14 is provided to perform the operation. FIG. 3 is a perspective view schematically showing the upper airflow direction conversion unit 14. The upper airflow direction conversion unit 14 includes a substantially conical conversion unit main body 14a having a conical surface (hereinafter referred to as a “conical surface”) 14b whose outer diameter gradually decreases downward, and a conversion unit main body 14a. An annular holding plate 15 capable of holding the conversion portion main body 14a by receiving the conical surface 14b with the circular hole 15a. In FIG. 2, the holding plate 15 is omitted. The conversion unit main body 14a has a circular upper surface 14c. The holding plate 15 is connected to the top plate 11, but the top plate 11 may be configured to have the holding plate 15. The diameter of the circular hole 15a of the holding plate 15 is set to be slightly smaller than the maximum diameter (outer diameter of the upper surface 14c) of the conical surface 14b of the conversion portion main body 14a. The state shown in FIG. 3 is the initial position of the upper airflow direction conversion unit 14. In this initial position, the upper surface 14c of the conversion unit main body 14a extends vertically and horizontally along the axis of the housing 10, and the axis of the conversion unit main body 14a coincides with the axis of the housing 10. Therefore, the vertex (lower end point) of the conical surface 14 b is also on the axis of the housing 10. The upper airflow direction conversion unit 14 is configured so that the conversion unit main body 14a can be manually or tilted with respect to the holding plate 15 from the initial position as shown in FIG. 4, the upper surface 14c of the conversion unit main body 14a is inclined with respect to the horizontal, and the apex of the conical surface 14b is off the axis of the housing 10. The upper air flow redirection unit 14 at the initial position discharges air substantially uniformly from the exhaust port 31 over 360 degrees in the circumferential direction, as indicated by the arrow in FIG. On the other hand, at the inclined position in FIG. 4, as indicated by the arrow in FIG. 6, the amount of air exhausted from the exhaust port 31 becomes uneven over 360 degrees in the circumferential direction. More specifically, the exhaust port 31 is on the side where the angle of the conical surface 14b of the conversion unit main body 14a with respect to the horizontal is smaller (left side in FIG. 4) than on the side where the angle of the conical surface 14b with respect to the horizontal is large (right side in FIG. 4). The amount of air discharged from is increased. The inclination position in FIG. 4 is merely an example of the inclination position, and the conversion unit main body 14a can be set to various inclination positions by changing the inclination of the conical surface 14b of the conversion unit main body 14a with respect to the holding plate 15. Can be. In addition, the conical surface 14b described above has a vertical cross-section that is substantially an isosceles triangle with the apex angle at the lower end at the initial position, but as shown in the cross-section of FIG. It has a cross-sectional shape that is curved so as to be slightly depressed upward. In FIG. 4 and the like, for convenience of description, the conversion unit main body 14a is represented by a conical shape.

  In the blower 1, above the bottom plate 12, a lower airflow direction conversion unit for gradually changing the direction of air taken inward in the radial direction from the first intake port 30 into the housing 10 upward in the axial direction. 16 are provided. Similarly to the upper air flow redirector 14, the lower air flow redirector 16 also includes a conical surface whose outer diameter gradually decreases from below to above. Although not described in detail, the lower airflow direction conversion unit 16 can be configured to be able to be inclined from the initial position similarly to the upper airflow direction conversion unit 14.

  In the blower 1 configured as described above, when the DC motor 29 is turned on, the first and second blades 20 and 21 rotate at the same speed in a predetermined direction. As a result, the first blade 20 takes air into the housing 10 from the first air inlet 30 and sends the air upward (downstream in the air passage direction) inside the housing 10. In addition to this, air is taken into the housing 10 from the second air inlet 32 by the second blade 21, and this air also merges with air taken in from the first air inlet 30, and flows through the inside of the housing 10. It is sent further up. As described above, since the second blade 21 has a larger pitch angle than the first blade 20, the amount of air sent upward is larger than that of the first blade 20. Further, since the degree of opening (upper or lower space or opening area) of the second intake port 32 is smaller than that of the first intake port 30 at the initial position of the cover 13b, the air taken into the housing 10 from the first intake port 30 is The second blade 21 merges with the air taken in from the second intake port 32 and hardly leaks air from the second intake port 32, which is downstream of the first intake port 30 from the second intake port 32, in the air passage direction. Sent downstream in the direction. Next, the combined air is turned from the upper part in the axial direction to the outer side in the radial direction by the upper airflow direction conversion part 14 in which the conversion part main body 14a is at the initial position, and extends from the exhaust port 31 to 360 degrees around the outside of the housing 10. Released evenly. By setting the converter main body 14a at the inclined position, the amount of air discharged from the exhaust port 31 can be made uneven in the circumferential direction. The amount of air discharged from the exhaust port 31 is the sum of the amount of air taken into the housing 10 from the first intake port 30 and the amount of air taken into the housing 10 from the second intake port 32. The amount of air that is released 360 degrees from the surroundings increases when the housing 10 has only one intake port (only the first intake port 30) without increasing the rotation speed of each of the first and second blades 20, 21. Increase in comparison. Further, the air discharged from the exhaust port 31 is not the wind directly sent from the first and second blades 20 and 21, but the indirect wind whose direction is changed by the upper airflow direction conversion unit 14. It can be said.

FIG. 7 is a chart in which the wind speed corresponding to the air feed amount of the first blade 20 is measured. The wind speed measured downstream of the first blade 20 at the rotation speed L1 of the DC motor 29 is L1. The rotation speed was 0.7 m / sec, the rotation speed was 1.2 m / sec for L2 at a medium speed, and the wind speed was 1.7 m / sec for L3 at a high rotation speed. In this experiment, the cylindrical body 10a having the same dimensions as the housing 10 was placed sideways. Incidentally, L1, L2, L3 of the air volume, the cross-sectional area of each wind speed × cylinder 10a: is ((a radius of about 220 mm / 2) × (about ^{220mm / 2) × 3.14m 2)} . FIG. 8 is a chart showing the measured wind speed corresponding to the air feed amount of the second blade 21 having a larger pitch angle than that of the first blade 20. At a low speed L1, the wind speed measured downstream of the second blade 21 is shown. Was 0.8 m / sec, the speed was 1.4 m / sec at medium speed L2, and the wind speed was 1.8 m / sec at high speed L3. From the above, it can be seen that the air feed amount of the second blade 21 is larger than the air feed amount of the first blade 20.

  FIG. 9 shows that the first and second blades 20 and 21 are arranged at an interval of about 200 mm in the cylindrical body 10 a without the intermediate (second) air inlet (32), and the downstream of the second blade 21. It is the chart which measured the wind speed similarly to the above. In this case, the wind speed was 0.8 m / sec for L1, 1.3 m / sec for L2, and 1.8 m / sec for L3. This result is almost the same as the case of the first blade 20 alone shown in FIG. FIG. 10 shows a state in which the first and second blades 20 and 21 are provided in the cylindrical body 10b provided with the opening 32a having the same width as the second intake port 32 (the width in the left-right direction in FIG. 10). 11 is a chart in which the wind speed is measured downstream of the second blade 21 in the same manner as described above. The opening 32a was formed between the first and second blades. In this case, the wind speed was 1.2 m / sec at L1, 1.9 m / sec at L2, and 2.3 m / sec at L3. By comparing this result with the result of FIG. 9, it can be seen that the amount of air discharged is increased by the amount of air taken in from the opening 32a. Therefore, in the blower 1 as well, the amount of air discharged from the exhaust port 31 is increased by the amount of air taken in from the second intake port 32 as compared with the case where the second intake port 32 is not provided.

  In the blower 1 described above, for example, by disposing the fragrance in the housing 10, the fragrance can be added to the air discharged from the exhaust port 31. Further, by providing a heating means such as a heater in the housing 10, the air heated by the heating means can be discharged from the exhaust port 31. In this case, the heated air is discharged from the lower exhaust port 31 or the first intake port 30 by turning the blower 1 upside down or by rotating the first and second blades 20 and 21 in reverse. It may be. Further, by adding a filter to the first and second intake ports 30 and 32, an air cleaning function can be added to the blower 1.

  In the blower 1 according to the above embodiment, the two blades 20 and 21 and the one intermediate intake port (second intake port) 32 are provided, but the present invention is not limited to this. FIG. 11 is a schematic explanatory diagram of a blower 41 according to another embodiment of the present invention. The blower 41 is provided on a cylindrical housing 50, three blades (first to third blades) 60, 61, and 62 disposed in the housing 50, and a peripheral portion (side portion) 53 of the housing 50. And two intermediate intake ports 72 and 73 provided. The first to third blades 60, 61, 62 are arranged in the housing 50 at intervals in the axial direction (air passage direction). The respective intermediate intake ports 72, 73 are provided between the first to third blades 60, 61, 62, respectively. The pitch angle of the most downstream third blade 62 is greater than the pitch angle of the intermediate second blade 61, and the pitch angle of the second blade 61 is greater than the pitch angle of the most upstream first blade 60. . In addition, the blower 41 includes a first intake port 70 provided at a lower end of the housing 50, an exhaust port 71 provided at an upper end of the housing 50, and a rotation common to the first to third blades 60, 61, 62. A motor (not shown) as a drive source. In the present example, the first intake port 70 and the exhaust port 71 are provided with the lower end face and the upper end face of the housing 50 completely open, but may have the same form as the blower 1 described above.

  In the blower 41 configured as described above, turning on the motor causes the first to third blades 60, 61, and 62 to rotate in the predetermined direction at the same speed. Thus, the first blades 60 take in air from the first air inlet 70 into the housing 50 and send the air upward (downstream in the air passage direction) through the housing 50. In addition to this, air is taken into the housing 50 from the two intermediate intake ports 72 and 73 by the second and third blades 61 and 62, and this air is also mixed with air taken in from the first intake port 70. They merge and are sent further upward in the housing 50. The second blade 61 has a larger pitch angle than the first blade 60, and the third blade 62 has a larger pitch angle than the second blade 61. Therefore, the air taken into the housing 50 from the first air inlet 70 hardly leaks to the outside of the housing 50 from the intermediate air inlets 72 and 73 downstream of the first air inlet 70 in the air passage direction. The third blades 61 and 62 respectively merge with the air taken in from the respective intermediate air inlets 72 and 73 and are sent further downstream in the air passage direction, and discharged from the housing 50 through the air outlet 71. Therefore, the amount of air discharged from the exhaust port 71 depends on the amount of air taken into the housing 50 from the first intake port 70 and the amount of air taken into the housing 50 from each of the two intermediate intake ports 72 and 73. Since the total sum is obtained, the amount of air discharged from the exhaust port 71 is increased as compared with the case where only the first intake port 70 is used, without increasing the rotation speed of each of the first to third blades 60, 61, and 62. Is done. The blower 41 may be used with the housing 50 arranged horizontally.

1, 41 Blower 10, 50 Housing 13, 53 Peripheral side part 14 Upper air flow direction conversion unit 20, 60 First blade 21, 61 Second blade 62 Third blade 29 DC motor (rotary drive source)
30, 70 First intake port 31, 71 Exhaust port 32 Second intake port (intermediate intake port)
72, 73 Intermediate intake port P Air passage

Claims (8)

A housing having a first intake port and an exhaust port, and internally defining an air passage through which air passes from the first intake port to the exhaust port;
At least two blades arranged between a first intake port and an exhaust port in a housing in an air passage direction in which air passes through an air passage. At least two blades for sending air to the
A rotation drive source for rotating the at least two blades,
Said housing, said at least two blades, have a middle inlet to each between two blades adjacent to each other in the air passage direction,
The at least two blades are configured such that the amount of air sent by the downstream blade in the air passage direction of the two blades adjacent to each other in the air passage direction is less than the amount of air sent by the upstream blade in the air passage direction. Blower set to be even larger . The at least two blades have the same diameter, and the pitch angle of the downstream blade in the air passage direction is larger than the pitch angle of the upstream blade in the air passage direction among the two blades adjacent in the air passage direction. The blower according to claim 1 , which is set as follows. 3. The blower according to claim 1, wherein the at least two blades include a first blade upstream and a second blade downstream in the air passage direction. 4. The blower according to any one of claims 1 to 3 , wherein the housing has a cylindrical shape whose axis extends in a vertical direction, and the exhaust port opens over 360 degrees in a circumferential direction with respect to the axis of the housing. 5. The blower according to claim 4 , further comprising an airflow direction conversion unit configured to direct air flowing in the housing in one of the up and down directions to the exhaust port that opens at 360 degrees in the circumferential direction. 6. The air flow redirection portion includes a conical surface, and the conical surface is discharged from the exhaust port at an initial position where the amount of air discharged from the exhaust port is uniform over 360 degrees in the circumferential direction. 6. The blower according to claim 5 , wherein the blower can take an inclined position at which the amount of air becomes uneven over 360 degrees in the circumferential direction. The rotary drive source, blower according to claim 1 or 2 wherein at least common to the two wings. The housing includes a side portion on which the first intake port, the exhaust port, and the intermediate intake port are opened, and the side portion includes a cover that covers a portion other than the first intake port, the exhaust port, and the intermediate intake port. The blower according to any one of claims 1 to 7 , wherein the opening area of the first intake port and / or the exhaust port and / or the intermediate intake port can be changed by shifting.

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