TWI735813B - Noise reduction fan device - Google Patents

Abstract

A noise reduction fan device includes a housing unit and a fan wheel. The housing unit includes a shell that defines an installation space, a perforated plate that divides the installation space into an airflow area and a noise reduction cavity spaced along an axis, and has a plurality of holes, and a porous plate connected to the airflow area The air inlet pipe, the shell has an air outlet opened along the direction perpendicular to the axis, and a perforation penetrating along the axis. The holes all penetrate in the direction of the wind, and the projection range of the noise reduction cavity toward the installation space overlaps with the installation space. The fan wheel is installed in the airflow area and between the perforated plate and the air inlet pipe, and can rotate around the axis to generate airflow, so that the noise wave in the airflow area is transmitted to the airflow area through the holes Noise reduction cavity, and reflect and offset the subsequent noise waves generated.

Description

Noise reduction fan device

The invention relates to a fan auxiliary equipment, in particular to a noise reduction fan device.

When a general fan is running, turbulence is easily formed at the end of the fan blade, which causes irregular vibration of the air and the fan blade. Due to the irregular vibration, the fan will make noise when it is running.

Referring to FIG. 1, there is an existing noise reduction device 1, which is suitable for being connected to a fan 10, and includes a frame cover 11 connected to the fan 10 and defining an inner space 110, and a frame cover 11 installed in the inner space 110 The passive fan blade 12, an annular plate 13 arranged in the inner space 110 and dividing the inner space 110 into a silencing chamber 130 surrounding the periphery, and a silencing material 14 filled in the silencing chamber 130. Wherein, the frame cover 11 has a plurality of through holes 111 in a penetrating shape, and the ring plate 13 has a plurality of through holes 131 in a penetrating shape and communicating between the inner space 110 and the muffler chamber 130. The air flow generated by the fan 10 is guided to the inner space 110 by the rotation of the passive fan blade 12, and then disperses the frequency through the through holes 111, or enters the silencing chamber 130 through the through holes 131 and is affected by the silencing material 14 absorption, thereby producing the effect of eliminating noise.

However, the above method requires an additional passive fan blade 12, and whether the passive fan blade 12 can be rotated by the air flow generated by the fan 10, and then the air flow is directed to the muffler chamber 130 or to the outside through the through holes 111 , It is necessary to properly adjust the parameters such as the rotation performance and overall shape of the fan 10. Therefore, not only the manufacturing process of the noise reduction device 1 is relatively complicated, but it is also doubtful whether it can produce the expected noise reduction effect if it is not properly designed.

Referring to FIG. 2, there is a conventional resonance noise reduction device 2 which is suitable for connecting a fan 20 and includes a resonance unit 21 connected to the fan 20 and a central processing unit 22 connected to the resonance unit 21 for information. Wherein, the resonance unit 21 includes a housing 211 defining an inner space 210 communicating with the fan 20, and a housing 211 disposed in the inner space 210 and separating the inner space 210 from a resonance cavity communicating with the fan 20 The partition 212 of 200, an elastic member 213 connected between the partition 212 and the housing 211 to enable the partition 212 to move relative to the housing 211, and two mounted on the partition 212 and The information is connected to the central processing unit 22 and used to sense the noise sensor 214. When the sensing elements 214 sense the noise generated by the operation of the fan 20, the central processing unit 22 adjusts the partition 212 and the elastic member 213 to move the partition 212 in the inner space 210. In this way, the volume of the resonant cavity 200 is changed, and the resonant volume is changed to achieve the effect of noise reduction.

However, the resonance unit 21 also needs to be connected to a central processing unit 22. The calculation of the central processing unit 22 can be used to generate adjustments for the fan 20. However, the central processing unit 22 not only occupies a large volume and high construction cost, but also has a complicated control mechanism, which is very inconvenient to use and construct.

Therefore, the object of the present invention is to provide a noise reduction fan device with a relatively simple configuration and capable of reliably achieving a noise reduction effect.

Therefore, the noise reduction fan device of the present invention includes a housing unit and a fan wheel.

The housing unit includes a shell that defines an installation space, a perforated plate that divides the installation space into an airflow area and a noise reduction chamber separated along an axis, and has a plurality of holes penetrating in the same direction, and a continuous The air inlet pipe leading to the airflow area has an air outlet opening along the direction perpendicular to the axis, and a through hole passing through the axis. The air inlet pipe is connected to the perforation and introduces air flow along an air inlet direction, the holes of the perforated plate are all through the air inlet direction, and the projection range of the noise reduction cavity toward the installation space overlaps the installation space .

The fan wheel is installed in the air flow zone and between the perforated plate and the air inlet pipe, and can rotate around the axis to generate air flow. The noise wave generated by the fan wheel in the air flow zone follows Part of the air flow is transmitted to the noise reduction cavity through the plurality of holes on the perforated plate, and is reflected to offset the subsequent noise waves.

The effect of the present invention is that when the fan wheel is running in the airflow area to generate airflow, part of the airflow will flow from the airflow area into the noise reduction cavity through the plurality of holes on the perforated plate, and at the same time, by avoiding the generation of resonance frequencies, And the mechanism of dispersing the airflow to reduce the wind shear, with a relatively simple configuration to achieve the effect of noise reduction.

3: housing unit

301: Airflow Zone

302: Noise reduction cavity

31: Shell

310: installation space

311: Shell

312: Pedestal

315: perforation

316: bottom plate

317: Through Hole

318: air outlet

319: side opening

32: perforated plate

321: inner hole

329: Hole

33: Inlet pipe

34: deflector

4: Fan wheel

5: Sound-absorbing material

A: axis

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a cross-sectional view illustrating an existing noise reduction device; Figure 2 is a schematic diagram of a system configuration, illustrating an existing Resonance noise reduction device; Figure 3 is a perspective exploded view illustrating a first embodiment of the noise reduction fan device of the present invention; Figure 4 is a perspective view illustrating the assembled form of the first embodiment; Figure 5 is a cross-sectional view Figure 6 is a cross-sectional view illustrating a second embodiment of the noise reduction fan device of the present invention; Figure 7 is a three-dimensional exploded view illustrating a first embodiment of the noise reduction fan device of the present invention Three embodiments; FIG. 8 is a cross-sectional view illustrating the effect of eliminating noise of the third embodiment; and FIG. 9 is a cross-sectional view illustrating a fourth embodiment of the noise reduction fan device of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIGS. 3 and 4, a first embodiment of the noise reduction fan device of the present invention includes a housing unit 3 and a fan wheel 4 arranged in the housing unit 3.

Referring to FIGS. 3 to 5 at the same time, the housing unit 3 includes a housing 31 that defines an installation space 310, and a housing 31 that divides the installation space 310 into an airflow area 301 and a noise reduction cavity 302 spaced along an axis A. The perforated plate 32, an air inlet pipe 33 connected to the air flow area 301, and a guide element 34 for guiding the air out. The housing 31 has a housing 311 surrounding the airflow area 301 and having a side opening 319, a set of bases 312 connected to the housing 311 and surrounding the noise reduction cavity 302, and a vertical axis A along the axis A The air outlet 318 opened in the direction. The air guide 34 is disposed at the air outlet 318, and is preferably a tapered shape that gradually appears radially inwardly outwards, so as to achieve the effect of concentrating the airflow to pressurize the air, but it is not limited to this type. .

The perforated plate 32 is disposed between the housing 311 and the base 312, and has a penetrating inner hole 321, so that the air inlet pipe 33 is connected to the inner hole 321 and penetrates the base 312. Extend to the outside of the shell cover 311. In addition, a plurality of through holes 329 are formed on the perforated plate 32 to allow part of the air flow in the air flow area 301 to flow to the noise reduction cavity 302. The fan wheel 4 is installed in the airflow zone 301 and can rotate around the axis A to generate airflow, so that part of the airflow in the airflow zone 301 flows through the holes 329 on the perforated plate 32 to the drop Noise cavity 302.

Referring to FIG. 5 and in conjunction with FIG. 3, when the fan wheel 4 is operating, external air will be introduced into the airflow area 301 through the air inlet pipe 33, and radially outward airflow will be generated due to the operation of the fan wheel 4. The airflow mainly exits from the airflow area 301 to the air outlet 318. Wherein, a part of the air flow will enter the noise reduction cavity 302 through the hole 329 formed in the perforated plate 32. Cooperating with the specific noise frequency that may be generated during the operation of the fan wheel 4, the noise reduction cavity 302 can be used to present a specific shape, or the volume of the noise reduction cavity 302 can be changed to avoid generating a specific resonance frequency. In addition, the airflow entering the noise reduction cavity 302 through the holes 329 can also produce a dispersion effect, avoiding wind shear at a specific location, and further achieving a noise reduction effect.

Refer to FIG. 6, which is a second embodiment of the noise reduction fan device of the present invention. The difference between the second embodiment and the first embodiment is that it further includes a sound absorbing material 5 disposed in the noise reduction cavity 302, and The sound absorbing material 5 is preferably made of porous material. Compared with the first embodiment, the second embodiment can not only achieve the noise reduction effect of the first embodiment, but also can further absorb noise by the sound-absorbing material 5 to match the fan wheel 4 The specific frequency generated by the operation can achieve a better noise reduction effect according to the demand. In addition, filling the sound-absorbing material 5 in the noise reduction cavity 302 can also adjust and change the volume and shape of the noise reduction cavity 302 with a relatively simple filling method, so as to achieve adjustment according to the shape of the housing unit 3. To avoid the purpose of resonant frequency.

Referring to Figures 7 and 8, there is a third embodiment of the noise reduction fan device of the present invention. The difference between the third embodiment and the first embodiment is that the base 312 has a The bottom plate 316 is located at an end away from the shell cover 311 and has a through hole 317 in a penetrating shape. The air inlet pipe 33 is connected to the through hole 317. Compared with the first embodiment, the third embodiment is only different in the connection position of the air inlet pipe 33, and it can also be achieved by the way in which part of the airflow flows from the airflow area 301 to the noise reduction chamber 302. The first embodiment has the same noise reduction effect.

9 is a fourth embodiment of the noise reduction fan device of the present invention. The difference between the fourth embodiment and the first embodiment is that the housing 31 of the housing unit 3 has a direction along the axis A and The perforated plates 32 are respectively located at the perforations 315 on two opposite sides of the fan wheel 4, and the air inlet pipe 33 is connected to the perforations 315. That is to say, based on the position of the fan wheel 4, the perforated plate 32 and the air inlet pipe 33 are respectively located on opposite sides of the fan wheel 4, so that the noise reduction cavity 302 is located on the air inlet pipe 33. On the opposite side. Compared with the first embodiment and the third embodiment, the fourth embodiment is that the position of the noise reduction cavity 302 is different, so that the noise wave generated by the fan wheel 4 in the airflow area 301 can follow Part of the air flow is transmitted to the noise reduction cavity 302 through the plurality of holes 329 on the perforated plate 32, and is reflected to offset the subsequent noise waves. In addition to achieving the same noise reduction effect, it can also provide users with another choice. , In order to improve the versatility of the noise reduction fan device of the present invention that can be used with other equipment.

In summary, the noise reduction fan device of the present invention can make the fan wheel 4 operate to generate a part of the air flow, which flows from the air flow area 301 into the noise reduction cavity 302 through the perforated plate 32, and at the same time avoids the generation of resonance frequencies, and The machine that disperses the airflow and reduces the wind cut It can achieve the effect of noise reduction with a relatively simple configuration, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

3: housing unit

301: Airflow Zone

302: Noise reduction cavity

31: Shell

310: installation space

311: Shell

312: Pedestal

318: air outlet

319: side opening

32: perforated plate

321: inner hole

329: Hole

33: Inlet pipe

34: deflector

4: Fan wheel

A: axis

Claims (4)

A noise reduction fan device includes: a housing unit, including a casing defining an installation space, a partition of the installation space into an airflow area separated by an interval along an axis, and a noise reduction cavity with plural oriented in the same direction A perforated plate with a through hole and an air inlet pipe connected to the air flow area. The shell has an air outlet opening in a direction perpendicular to the axis and a perforation penetrating along the axis. The air inlet pipe is connected Introduce airflow through the perforation and along an inlet direction, the holes of the perforated plate are all through to the inlet direction, and the projection range of the noise reduction cavity toward the installation space overlaps the installation space; and a wheel, Installed in the airflow area and between the perforated plate and the air inlet pipe, and can rotate around the axis to generate airflow. The noise wave generated by the fan wheel in the airflow area follows part of the airflow through The plurality of holes on the perforated plate are transmitted to the noise reduction cavity, and are reflected to offset subsequent noise waves. The noise reduction fan device according to claim 1, further comprising a sound absorbing material arranged in the noise reduction cavity. The noise reduction fan device according to claim 2, wherein the sound absorbing material is a porous material. The noise reduction fan device according to claim 1, wherein the housing unit further includes a guide member arranged at the air outlet and used to guide the wind.

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