Air blower

Abstract

To provide an air blower that has increased static pressure (wind pressure) while suppressing increase in size of the air blower.SOLUTION: An air blower 1 of the present invention comprises a first air blower fan 2, a second air blower fan 3, a motor unit 4, and a casing 5 that houses the first air blower fan 2, the second air blower fan 3, and the motor unit 4. The first air blower fan 2 and the second air blower fan 3 are connected, the motor unit 4 is held in the casing 5, and the motor unit 4 allows the first air blower fan 2 and the second air blower fan 3 to rotate together.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a blower device in which a plurality of blower fans are housed in one housing. [Background technology]

[0002] A horizontally elongated fan motor equipped with multiple fans to increase the volume of airflow has been known (see Patent Document 1). The horizontally elongated fan motor (1) described in Patent Document 1 has fan housings (4) each housing a fan (3) connected by a connecting plate (32) to form a casing (5). Air is taken in through holes (13) in each fan housing (4) and exhausted through exhaust holes 12.

[0003] The horizontally elongated fan motor (1) described in Patent Document 1 can increase the overall airflow volume of the fan motor by providing multiple fans (3), but does not have a structure for increasing static pressure (wind pressure). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-240603 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, when the fan motor is installed in a device equipped with a filter, resistance increases when air is drawn in or exhausted through the filter, making it necessary to increase the rotation speed of the fan (3), the number of fans (3), or the size of the fan (3). Increasing the rotation speed of the fan (3) poses problems of increased power consumption and noise. In addition, increasing the number or size of the fans (3) increases the overall size of the horizontal fan motor (1).

[0006] Therefore, an object of the present invention is to solve the above problems and to provide a blower device that increases static pressure (wind pressure) while reducing the size of the blower device. [Means for solving the problem]

[0007] The blower device of the present invention comprises a first blower fan, a second blower fan, a motor unit, and a casing that houses the first blower fan, the second blower fan, and the motor unit, wherein the first blower fan and the second blower fan are connected to each other, the motor unit is held in the casing, and the motor unit allows the first blower fan and the second blower fan to rotate as a unit. [Effects of the Invention]

[0008] According to the present invention, the static pressure (wind pressure) can be increased while the size of the blower is reduced. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a blower device according to an embodiment of the present invention; [Figure 2] 2A is a plan view, FIG. 2B is a rear perspective view, and FIG. 2C is a front perspective view of cross section A in FIG. 1. [Figure 3] 2A is a plan view, FIG. 2B is a rear perspective view, and FIG. 2C is a front perspective view of the cross section B of FIG. 1. [Figure 4] 2A and 2B are a plan view and a front perspective view, respectively, of cross section C in FIG. 1. [Figure 5] 2A and 2B are a perspective view and a front view, respectively, of the cross section DD in FIG. 1. [Figure 6] 2A and 2B are a perspective view and a front view, respectively, of the first centrifugal fan and the second centrifugal fan before they are fixed together, taken along the line DD in FIG. 1; [Figure 7] 2A is a perspective view of the first centrifugal fan and the second centrifugal fan after they have been fixed together, and FIG. 2B is a front view of the cross section taken along the line DD in FIG. 1. [Figure 8]2 is a cross-sectional view of FIG. 1 taken along E-E axis. [Figure 9] FIG. 2 is a front perspective view showing the air flow of the embodiment of the present invention. [Figure 10] FIG. 2 is a perspective front view showing the air flow of an embodiment of the present invention. [Figure 11] FIG. 2 is a perspective rear view showing the air flow of the embodiment of the present invention; [Figure 12] FIG. 1 is an explanatory diagram showing PQ characteristics of a conventional blower and a blower according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of the blower device of the present invention will be described with reference to the accompanying drawings. Not all of the configurations described below are essential requirements of the present invention.

[0011] Fig. 1 shows the appearance of a blower device 1 of this embodiment. As shown in Fig. 5, the blower device 1 is configured to include a first blower fan 2, a second blower fan 3, a motor unit 4 as a drive source that provides rotational force to the first blower fan 2 and the second blower fan 3, and a casing 5 as a housing that houses the first blower fan 2, the second blower fan 3, and the motor unit 4. The blower device 1 can be used in various orientations, but in this embodiment, the top and bottom of Fig. 1 will be referred to as the top and bottom of the blower device 1.

[0012] 6 and 7, the first blower fan 2 has a substantially disk-shaped base 6 and a plurality of blades 7 arranged at equal intervals around the outer periphery of the base 6. The plurality of blades 7 all have the same shape, and are formed by bending a rectangular plate-like member into an arc.

[0013] A receiving portion 8 for mounting and fixing the second blower fan 3 is formed in the center of the base 6. The receiving portion 8 has a convex portion 10 that protrudes upward from an upper surface 9 of the base 6, and a cylindrical portion 12 that protrudes downward from a lower surface 11 of the base 8. An inner bottom portion 13 of the cylindrical portion 12 is located above the upper surface 9 of the base 6.

[0014] The second blower fan 3 has a cylindrical fan cup 14 with a bottom, a plate-shaped blade standing portion 15 extending outward from the lower end of the fan cup 14, and a plurality of blades 17 standing on the upper surface 16 of the blade standing portion 15.

[0015] A fixing portion 19 protruding upward is formed in the center of the top plate 18 of the fan cup 14. The fixing portion 19 has a columnar upper section 20 and a generally cylindrical lower section 21 with a larger diameter than the upper section 20. The inside of the lower section 21 is formed in a concave shape, and a shaft 22 serving as a rotation axis is inserted and fixed in the center of the inside of the lower section 21. A yoke 23 is also disposed on the inner surface of the fan cup 14. The upper section 20 of the fixing portion 19 is inserted into and fixed to the cylindrical section 12 of the first blower fan 2. Therefore, the rotation axis (not shown) of the first blower fan 2 and the rotation axis (not shown) of the second blower fan 3 are positioned coaxially.

[0016] The blade standing portion 15 has an inclined portion 24 inclined downward and a horizontal portion 25 extending horizontally. The blades 17 are erected on a part of the inclined portion 24 and the horizontal portion 25. The blade standing portion 15 has an annular shape, and multiple blades 17 are erected at equal intervals. All of the multiple blades 17 have the same shape, formed by curving a rectangular plate-like member into an arc. In this embodiment, the blades 7 and 17 have the same shape and are the same in number, but the size, shape, and number of the blades may differ between the first blower fan 2 and the second blower fan 3. In this embodiment, the diameter of the first blower fan 2 and the diameter of the second blower fan 3 are the same, but may be different.

[0017] As shown in FIGS. 5 and 8 , the motor unit 4 is disposed inside the fan cup 14 of the second blower fan 3. The motor unit 4 includes a permanent magnet 26 disposed on the inner surface of the yoke 23, a laminated core 28 attached to the outer periphery of a sleeve 27 formed in the casing 5, an upper cover 29 covering the upper side of the laminated core 28, a lower cover 30 covering the lower side of the laminated core 28, a winding (not shown) wound around the laminated core 28 from outside the upper cover 29 and the lower cover 30, and a printed circuit board (not shown) on which various electronic components are mounted and electrically connected to both ends of the winding. The second blower fan 3 equipped with the permanent magnet 26 rotates around the shaft 22 by receiving magnetic force from a stator 31 composed of the laminated core 28, the upper cover 29, the lower cover 30, and the winding. The first blower fan 2 fixed to the second blower fan 3 also rotates integrally with the second blower fan 3.

[0018] 1 to 5, the casing 5 integrally includes a substantially cylindrical scroll section 32 and a substantially rectangular tubular relay section 33. The casing 5 has a hollow structure with its interior divided into three sections, an upper section S1, a middle section S2, and a lower section S3.

[0019] An intake port 35, which is a circular through-hole, is formed in the top surface 34 of the casing 5. Furthermore, an arrangement hole 37, which is a through-hole through which the cylindrical portion 12 and the fixing portion 19 are inserted, is formed in the upper and middle partition portions 36. Furthermore, an intake hole 39, through which the fan cup 14 is inserted, is formed in the middle and lower partition portions 38. When the fan cup 14 is inserted into the intake hole 39, a gap is formed between the fan cup 14 and the partition portion 38, and air can flow through this gap (intake hole 39). Furthermore, a sleeve 27 that protrudes upward is formed in the bottom surface 40 of the casing 5. A cylindrical bearing 41 is housed within the sleeve 27, and a shaft 22 is inserted through this bearing 41. A tip end 42 of the shaft 22 abuts against a bottom portion 43 of the sleeve 27, and a base end 44 of the shaft 22 is fixed to the fixing portion 19.

[0020] A first blower fan 2 is arranged in the internal space S1, a motor unit 4 and the upper part of the fan cup 14 are arranged in the internal space S2, and a second blower fan 3 and a lower part of the motor unit 4 and the fan cup 14 are arranged in the internal space S3.

[0021] In the relay section 33 of the casing 5, an upper end 45 and a middle end 46 are closed, and an open exhaust port 48 is formed in a lower end 47. A path hole 49, which is a through hole that communicates between the internal space S1 and the internal space S2, is formed in the upper and middle partition sections 36 within the relay section 33. The path hole 49 is located outside the diameter of the first blower fan 2, and the air blown out from the first blower fan 2 is guided to the path hole 49.

[0022] The casing 5 is formed by joining a bottom surface portion 40, a first case 50, and a second case 51. The first case 50 and the second case 51 are joined at a joint 52. Therefore, after the first blower fan 2, the second blower fan 3, and the motor unit 4 are attached to the bottom surface portion 40, the bottom surface portion 40, the first case 50, and the second case 51 can be joined together. Note that, although the casing 5 is formed from three separate parts, namely the bottom surface portion 40, the first case 50, and the second case 51, in this embodiment, it may be formed from four or more separate parts.

[0023] Here, the air flow inside the casing 5 will be described with reference to FIGS. 8 to 11. Note that in FIGS. 9 to 11, reference numerals other than the main reference numerals are omitted. When the motor unit 4 is driven, the first blower fan 2 and the second blower fan 3 rotate together counterclockwise in a plan view. Then, outside air is taken into the casing 5 through the intake port 35, and the first blower fan 2 causes the air to flow counterclockwise through the internal space S1 of the scroll section 32 and into the path hole 49 of the relay section 33. The air that passes through the path hole 49 moves from the internal space S1 to the internal space S2 and flows into the internal space S3 through the intake port 39. The air that has flowed into the internal space S3 is caused to flow counterclockwise in a plan view inside the scroll section 33 by the second blower fan 3 and is exhausted to the outside of the casing 5 through the exhaust port 48 of the relay section 33.

[0024] It is preferable that the relationship be such that the opening area of ​​the path hole 49 is less than the opening area of ​​the intake hole 39 and less than the opening area of ​​the exhaust port 48. For example, if the opening area of ​​the path hole 49 is greater than the opening area of ​​the intake hole 39, the diameter of the second blower fan 3 can be made larger than the diameter of the first blower fan 2, and the static pressure and air volume of the entire blower device 1 can be adjusted.

[0025] Fig. 12 shows a comparison of the PQ characteristics (air volume-static pressure characteristics) of a conventional fan (not shown) and fan 1. The intake and exhaust resistance in Fig. 12 indicates the resistance to intake and exhaust when the conventional fan and fan 1 are mounted on equipment and driven, with the greater the slope of line L1 indicating the intake and exhaust resistance, the greater the resistance, and the smaller the slope, the smaller the resistance. For example, if a filter is provided in the air intake port (not shown) or air exhaust port (not shown) formed on the equipment to be mounted, the intake and exhaust resistance will be greater.

[0026] As shown in FIG. 12, the blower 1 according to the present invention has the characteristic that the amount of air blown is greater than that of a conventional blower when the intake / exhaust resistance is greater than a predetermined value (line L2).

[0027] As described above, the blower device 1 of this embodiment includes the first blower fan 2, the second blower fan 3, the motor unit 4, and the casing 5 that houses the first blower fan 2, the second blower fan 3, and the motor unit 4. The first blower fan 2 and the second blower fan 3 are connected to each other, the motor unit 4 is held in the casing 5, and the first blower fan 2 and the second blower fan 3 can be rotated integrally by the motor unit 4. Therefore, even when two blower fans, the first blower fan 2 and the second blower fan 3, are used, the size of the blower device 1 can be reduced and the static pressure (wind pressure) can be increased.

[0028] Furthermore, in the blower device 1 of this embodiment, the diameter of the first blower fan 2 is the same as the diameter of the second blower fan 3. Therefore, the internal space of the casing 5 is less likely to be wasted.

[0029] Furthermore, in the blower device 1 of this embodiment, the rotation shaft of the first blower fan 2 and the rotation shaft of the second blower fan 3 are positioned coaxially. Therefore, the rotation shaft of the first blower fan 2 and the rotation shaft of the second blower fan 3 can be rotated by a single motor unit 4, and the overall size of the blower device 1 can be reduced.

[0030] Furthermore, in the blower device 1 of this embodiment, the casing 5 has a three-stage structure consisting of an upper stage, a middle stage, and a lower stage, and the casing 5 is formed with an air intake port 35 for taking in air and an air exhaust port 48 for exhausting air, and the air taken in through the air intake port 35 flows through the internal space S1 of the upper stage, the internal space S2 of the middle stage, and the internal space S3 of the lower stage, and is exhausted from the air exhaust port 48. Therefore, the air flows in one direction, and the static pressure can be increased by the first blower fan 2 and the second blower fan 3.

[0031] Furthermore, in the blower device 1 of this embodiment, a path hole 49 through which air passes is formed in the partition 36 that separates the upper internal space S1 from the middle internal space S2, and the path hole 49 is located outside the diameter of the first blower fan 2, so that air passes through the path hole 49 and flows into the middle internal space S2. Therefore, air blown outward from the first blower fan 2 can easily flow into the path hole 49.

[0032] In addition, in the blower device 1 of the present embodiment, the opening area of ​​the path hole 49 is equal to or larger than the opening area of ​​the exhaust port 48. Therefore, air can be discharged from the exhaust port 48 without reducing the amount of air passing through the path hole 49.

[0033] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the casing 5 may have a different shape, taking into consideration the shapes and sizes of the first blower fan 2 and the second blower fan 3, and the positions and shapes of the intake port 35 and the exhaust port 48. [Explanation of symbols]

[0034] 1. Blower 2 First blower fan 3 Second blower fan 4 Motor Unit 5 Casing 35 Air intake 36 Partition 48 Exhaust port 49 Pathway hole S1 Upper level interior space S2 Middle level interior space S3 Lower level interior space

Claims

1. a first blower fan; a second blower fan; A motor unit; a casing that houses the first blower fan, the second blower fan, and the motor unit, The first blower fan and the second blower fan are connected to each other, The motor unit is held in the casing, The blower device, characterized in that the first blower fan and the second blower fan can be rotated integrally by the motor unit.

2. 2. The blower device according to claim 1, wherein the diameter of the first blower fan and the diameter of the second blower fan are the same.

3. 2. The blower device according to claim 1, wherein the rotation shaft of the first blower fan and the rotation shaft of the second blower fan are coaxially positioned.

4. The casing has a three-stage structure consisting of an upper stage, a middle stage, and a lower stage, The casing is formed with an intake port for taking in air and an exhaust port for discharging the air, 2. The blower device according to claim 1, wherein the air taken in through the air intake flows through the internal space of the upper stage, the internal space of the middle stage, and the internal space of the lower stage, and is discharged through the exhaust port.

5. a partition separating the upper-stage internal space from the middle-stage internal space is formed with a path hole through which the air passes, the path hole is located outside the diameter of the first blower fan, The blower device according to claim 4, wherein the air passes through the path holes and flows into the internal space of the middle stage.

6. The blower device according to claim 5, wherein an opening area of ​​the path hole is equal to or larger than an opening area of ​​the exhaust port.

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