JP2013234644A - Fan device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial flow fan reduced in noise generated by a collision of an air flow on a harness and favorable in the balance of structure.SOLUTION: A fan device comprises a cylindrical outside housing 100 and an inside housing 200 supported by n fixed blades 101 at the inside of the outside housing 100 and supporting a motor. The fixed blades 101 are arranged in a state that one piece is removed from a plurality of n+1 pieces of the fixed blades 101, and a harness 300 for driving the motor is arranged in a portion in which one piece of the fixed blade 101 is removed in a shape similar to those of the surrounding fixed blades 101.

Description

  The present invention relates to a fan device characterized by a harness structure.

  Patent Document 1 discloses a structure in which lead wires are arranged from the motor portion to the outside of the housing in order to reduce noise generated when a plurality of lead wires of an axial fan collides with the air flow. ing.

JP 2009-264242 A

  The structure described in Patent Document 1 is not sufficiently effective in reducing noise caused by the flow of air striking the lead wire, and the structural balance is not good. In such a background, an object of the present invention is to provide a fan device in which noise generated by the air flow hitting the harness is reduced and the structural balance is good.

  The invention according to claim 1 includes a cylindrical outer housing, and an inner housing that is supported by n fixed blades inside the outer housing and supports a motor. A harness for driving the motor is fixed to a portion where one of the fixed blades is removed from a state where a plurality of the n + 1 fixed blades are evenly arranged in the direction. The fan device is arranged in the same shape as the blades. According to the first aspect of the present invention, since the harness is disposed in the portion where one of the fixed blades is conventionally disposed, the noise generated when the air flow hits the harness is reduced, and the balance is further improved. A structure is obtained.

  According to a second aspect of the present invention, in the first aspect of the present invention, the inner housing is formed with a first groove extending in the axial direction for accommodating the harness. According to a third aspect of the present invention, in the first or second aspect of the present invention, the outer housing is formed with a second groove for receiving the harness, and the second groove is another fixing member. They are arranged at the same angle as the blades. According to a fourth aspect of the present invention, in the third aspect of the present invention, the second groove has a step corresponding to a wire constituting the harness. According to invention of Claim 2 thru | or 4, a harness can be easily shape | molded in the shape similar to a fixed blade | wing, and a harness can be hold | maintained in the stable state.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the harness is hardened with resin. According to the fifth aspect of the present invention, since the harness is fixed with the resin and the surface is covered with the resin, the vibration of the harness is suppressed and the noise is further reduced. Further, when the harness is molded in accordance with the shape of the blade, the shape is fixed by the resin in a shape that approximates the blade, so that the noise reduction effect can be obtained more effectively.

  ADVANTAGE OF THE INVENTION According to this invention, the noise which arises when the flow of air hits a harness is reduced, and also the fan apparatus with a good structural balance is provided.

They are a top view (A), a side view (B), an enlarged side view (C), a side sectional view (D) and an enlarged side sectional view (E) of the housing. It is the perspective view (A), top view (B), and side sectional view (C) of the housing which attached the harness. They are a perspective view (A), a perspective view (B), a side view (C), a top view (D), and a side view (E) of the axial fan. It is a graph which shows the measured value of noise.

  FIG. 1 shows an outer housing 100 having a substantially cylindrical structure. 1A is a top view of the housing (A), FIG. 1B is a side view seen from the direction P, and FIG. 1C is an enlarged side view of the portion J in FIG. It is a figure, (D) is the sectional side view cut | disconnected by the line of GG in (A), (E) is the expanded side view which expanded the K part of (D).

  The outer housing 100 includes eight fixed blades (fixed wings) 101 inside thereof, and the inner housing 200 is held in the central portion of the outer housing 100 by the fixed blades. The outer housing 100, the inner housing 200, and the fixed blade 101 are integrally molded products made of resin, and constitute the housing of the fan device. The inner housing 200 functions as a motor base that supports a motor (not shown), and a motor board (not shown) on which a drive circuit that drives a motor (not shown) is mounted is attached.

  The eight fixed blades 101 are in an arrangement state in which one sheet is removed from the state in which nine sheets are evenly arranged in the circumferential direction. A portion indicated by an arrow 104 in FIG. 1A is a portion from which one of the blades is removed. A harness to be described later is arranged in a portion where one of the blades is removed.

  The outer housing 100 is provided with a groove 102 (an example of a second groove) through which a harness described later passes. The groove 102 extends in a direction along the cross-sectional shape of the surrounding fixed blade 101 (a direction oblique to the axis), and includes a step 103 into which each lead wire constituting the harness fits. The inner housing 200 is provided with a groove 201 (an example of a first groove) through which the harness passes. The groove 201 has a structure extending along the extending direction of the shaft.

  FIG. 2 shows a state where the harness 300 is attached to the housing. FIG. 2C shows a cross section taken along line AA in FIG. In this example, the harness 300 is composed of four lead wires (of course, the number of lead wires is not limited). A drive signal and power supply power are supplied from the outside to the motor board in the inner housing 200 by lead wires constituting the harness 300.

  The harness 300 is bundled so as to have the same shape as the surrounding fixed blades 101. Here, the harness 300 is passed through the groove 102 and the groove 201, is guided by the grooves 102 and 201, is twisted between the outer housing 100 and the inner housing 200, and is fixed to the fixed blade 101. It is formed to have a similar shape. Further, the harness 300 pulled out to the outer housing 100 is further pulled out to the outside as indicated by reference numeral 301.

  FIG. 3 shows the axial fan 400 in the assembled state. The axial fan 400 includes five rotating blades 500 on one surface in the axial direction, and includes fixed blades 101 on the other surface in the axial direction. The rotary blade 500 is driven and rotated by a motor not visible in the figure supported by the inner housing 200.

  As described above, the axial fan 400 according to the embodiment includes the cylindrical outer housing 100 and the inner housing 200 supported by the n fixed blades 101 inside the outer housing 100 and supporting the motor. The fixed blade 101 is arranged in a state in which one piece of the fixed blade 101 is removed from a state in which a plurality of n + 1 fixed blades 101 are evenly arranged in the circumferential direction, and the motor is driven to a portion where one fixed blade 101 is removed. The harness 300 has a structure arranged in the same shape as the surrounding fixed blades 101.

In summary, the axial fan 400 has the following characteristics.
(1) It has a structure in which one of fixed blades (fixed blades) that are equally arranged is removed.
(2) The harness is routed (lined) in a state where the harness is formed in the same shape as the fixed blade in the portion from which one fixed blade is removed.
(3) The inner housing that pulls out the harness from the motor board is provided with guide grooves arranged in a vertical row.
(4) The harness is provided with a guide groove in the outer housing so as to be easily routed (lined), and the guide groove is arranged substantially along the inclination angle of the blade.
(5) The routed (wired) harness may be hardened with resin.

According to this structure, the following advantages can be obtained.
(1) The part where the air flow hits is almost the same shape and balanced.
(2) A structural balance is ensured by matching the state of the harness to the removed blade shape.
(3) It is easy to pull out the harness from the motor board.
(4) With the guide groove, a bundle of lead wires drawn from the inner housing toward the outer housing can be easily arranged in the shape of a blade.
(5) The routed (wired) harness can be more firmly fixed.
(6) Since one fixed blade is removed and the harness is arranged there as one fixed blade, the fan efficiency does not decrease.

(Actual measurement data)
A sample having a structure in which a harness is simply drawn from the inner housing to the outer housing without removing one blade was produced as a comparative example. The axial fan of this comparative example and the axial fan of the embodiment were operated under the same conditions, and the generated operating sound was measured. As a result, it was confirmed that the harmonics of the NZ component can be reduced by using the structure of the present embodiment as compared with the comparative sample. The NZ component is a noise component due to fan motor blades, and has a peak at a frequency obtained by multiplying the rotation period of the motor by the number of blades. Since the NZ component generates a harmonic having itself as a fundamental wave, the greater the value, the higher the level of annoying noise.

  FIG. 4 shows the measurement data. In FIG. 4, an existing product is a comparative example, and a device is the present embodiment. FIG. 4 shows a state where the component (2NZ) twice the NZ component is reduced by about 5.6 dB.

(Other)
The number of fixed blades is not limited to eight, and may be four or six, for example. When the number of fixed blades is n, a structure using the present invention can be obtained by providing a structure in which n + 1 fixed blades are uniformly provided in the circumferential direction and one of them is removed. .

  The aspect of the present invention is not limited to the individual embodiments described above, and includes various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the contents described above. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

  The present invention can be used for a fan device.

  DESCRIPTION OF SYMBOLS 100 ... Outer housing, 200 ... Inner housing, 101 ... Fixed blade, 102 ... Groove, 103 ... Step, 104 ... Portion where one blade is removed, 200 ... Inner housing, 201 ... Groove, 300 ... Harness, 301 ... Harness drawn to the outside, 400... Axial flow fan, 500.

Claims (5)

A cylindrical outer housing;
An inner housing supported by n fixed blades inside the outer housing and supporting the motor,
The n fixed blades are arranged in a state in which one is removed from a state in which a plurality of n + 1 fixed blades are uniformly arranged in the circumferential direction,
A fan device, wherein a harness for driving the motor is arranged in the same shape as a surrounding fixed blade in a portion from which one fixed blade is removed.   2. The fan device according to claim 1, wherein a first groove extending in an axial direction in which the harness is accommodated is formed in the inner housing. A second groove for receiving the harness is formed in the outer housing,
3. The fan device according to claim 1, wherein the second grooves are arranged at an angle similar to that of other fixed blades.   4. The fan device according to claim 3, wherein the second groove has a step corresponding to a wire constituting the harness. 5.   The fan device according to any one of claims 1 to 4, wherein the harness is hardened with a resin.

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