TW202016434A - Noise-reduction fan device capable of avoiding generation of resonant frequency and thus reducing noises generated when the fan impeller is operated - Google Patents

Abstract

A noise-reduction fan device includes a casing unit and a fan impeller. The casing unit includes a casing body that defines an installing space, a porous plate that is formed with a plurality of holes and that divides the installing space into an air-flowing zone and a noise-reduction chamber spaced apart from each other along an axis, and an air inlet tube that is in communication with the air-flowing zone. The casing body is provided with an air outlet port defined along a direction perpendicular to the axis. The fan impeller is installed in the air-flowing zone, and is rotatable to generate airflow by taking the axis as a center so that partial airflow in the air-flowing zone flows into the noise-reduction chamber through the plurality of holes of the porous plate, thereby avoiding generation of resonant frequency and thus reducing noises generated when the fan impeller is operated.

Description

Noise reduction fan device

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

During the operation of a general fan, turbulence is easily formed at the end of the blade, which causes irregular vibration of the air and the blade. Due to the irregular vibration, the fan will emit noise during operation.

Referring to FIG. 1, a conventional noise reduction device 1 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 The passive fan blade 12, a ring plate 13 disposed in the inner space 110 and separating the inner space 110 from a surrounding silencing chamber 130 surrounding the periphery, and a silencing material 14 filled in the silencing chamber 130. 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 airflow generated by the fan 10 is guided to the inner space 110 by the rotation of the passive blade 12, and then the frequency is dispersed through the through holes 111, or enters the muffler chamber 130 through the through holes 131 and is used by the muffler material 14 Absorption, thereby producing the effect of eliminating noise.

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

2, a conventional resonance noise reduction device 2 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. Wherein, the resonance unit 21 includes a casing 211 defining an inner space 210 communicating with the fan 20, a resonant cavity disposed in the inner space 210 and separating the inner space 210 from the fan 20 200, a partition 212, 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 is used to sense the noise sensor 214. When the sensor 214 senses 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 in order to generate adjustments for the fan 20 through calculation by the central processing unit 22. However, the central processing unit 22 not only occupies a large volume, has a high construction cost, but also has a complicated control mechanism, which is very inconvenient in use and construction.

Therefore, the object of the present invention is to provide a noise reduction fan device with a simpler 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 housing that defines an installation space, a porous plate that divides the installation space into an airflow region and a noise reduction cavity spaced along an axis, and has a plurality of holes, and a communication plate connected to the airflow region In the air inlet pipe, the casing has an air outlet opening in a direction perpendicular to the axis.

The fan wheel is installed in the airflow area, and can rotate to generate an airflow with the axis as the axis, so that part of the airflow in the airflow area flows to the noise reduction cavity through a plurality of holes in the porous plate.

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

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.

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 disposed 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, an airflow region 301 that partitions the installation space 310 along an axis A, and a noise reduction cavity 302 A perforated plate 32, an air inlet pipe 33 connected to the airflow area 301, and a flow guide 34 for guiding the wind out. The housing 31 has a housing 311 surrounding the airflow region 301 and having an opening 319 on one side, a set of bases 312 connected to the housing 311 and surrounding the noise reduction cavity 302, and a base along the axis A The air outlet 318 opened in the direction. The deflector 34 is disposed in the air outlet 318, and is preferably a tapered shape that gradually shrinks radially outward to achieve the effect of a concentrated air flow pressurizing 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 It extends beyond the shell 311. In addition, a plurality of through holes 329 are formed on the porous plate 32 to allow a part of the airflow in the airflow region 301 to flow to the noise reduction cavity 302. The fan wheel 4 is installed in the airflow region 301 and can rotate around the axis A to generate an airflow, so that part of the airflow in the airflow region 301 flows to the drop through the holes 329 in the porous plate 32 Noise chamber 302.

Referring to FIG. 5 and FIG. 3, when the fan wheel 4 is in operation, outside air is introduced into the airflow region 301 through the air inlet pipe 33, and a radially outward airflow is generated due to the operation of the fan wheel. The airflow mainly exits from the airflow area 301 to the air outlet 318. Wherein, a part of the airflow enters the noise reduction cavity 302 through the hole 329 formed in the porous plate 32. In conjunction with the specific noise frequency that may be generated when the fan wheel 4 is in operation, the noise reduction cavity 302 can be used in a specific form, or the volume of the noise reduction cavity 302 can be changed to avoid a specific resonance frequency. In addition, the airflow entering the noise reduction cavity 302 through the holes 329 can also produce a dispersion effect, avoid concentration of wind shear at a specific location, and can further achieve the noise reduction effect.

Referring to FIG. 6, it 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 a porous material. Compared with the first embodiment, in addition to the noise reduction effect of the first embodiment, the second embodiment can further absorb noise through the sound absorbing material 5 to match the fan wheel 4 The specific frequency generated by the operation can achieve better noise reduction effect according to the demand. In addition, filling the sound-absorbing material 5 in the noise-reducing cavity 302 can also adjust and change the volume and shape of the noise-reducing cavity 302 with relatively simple filling means, so as to achieve adjustment in accordance with the shape of the housing unit 3, To avoid the purpose of generating resonance frequency.

7 and 8, it 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 an end located away from the housing 311 , And has a bottom plate 316 with a through hole 317 in a penetrating shape, and the air inlet pipe 33 is connected to the through hole 317. Compared with the first embodiment, the third embodiment only differs in the connection position of the air inlet pipe 33, and can also pass partial airflow from the airflow region 301 to the noise reduction cavity 302 to achieve This first embodiment has the same noise reduction effect.

9, 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 along the axis A and the The perforated plates 32 are respectively located in the through holes 315 on the opposite sides of the fan wheel 4, and the air inlet pipe 33 is connected to the through holes 315. In other words, based on the position of the fan wheel 4, the porous plate 32 and the air inlet pipe 33 are located on opposite sides of the fan wheel 4 respectively, 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, in addition to achieving the same noise reduction effect, it can also provide another kind of user Selection to improve the versatility of the noise reduction fan device of the present invention to be used with other equipment.

In summary, the noise reduction fan device of the present invention can operate the fan wheel 4 to generate part of the airflow, and flow into the noise reduction cavity 302 from the airflow region 301 through the porous plate 32, while avoiding the generation of resonance frequency, and The mechanism of dispersing the air flow and reducing the wind shear achieves the noise reduction effect 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, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

3: Housing unit 301: Air flow area 302: Noise reduction cavity 31: Housing 310: Installation space 311: Housing cover 312: Base 315: Perforated 316: Base plate 317: Through hole 318: Air outlet 319: Side opening 32: Multi-hole Plate 321: inner hole 329: hole 33: air inlet pipe 34: air guide 4: fan wheel 5: sound absorbing material A: axis

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a cross-sectional view illustrating an existing noise reduction device; FIG. 2 is a schematic diagram of a system configuration illustrating an existing Resonance noise reduction device; FIG. 3 is an exploded perspective view illustrating a first embodiment of the noise reduction fan device of the present invention; FIG. 4 is a perspective view illustrating the assembled form of the first embodiment; FIG. 5 is a cross-sectional view To illustrate the effectiveness of the first embodiment in eliminating noise; FIG. 6 is a cross-sectional view illustrating a second embodiment of the noise reduction fan device of the present invention; FIG. 7 is a perspective 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 noise elimination effect 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.

3: Shell unit

301: Airflow area

302: Noise reduction cavity

31: Shell

310: installation space

311: Shell

312: Base

318: Air outlet

319: Side opening

32: Multi-well plate

321: inner hole

329: Hole

33: Intake duct

34: Flow guide

4: fan wheel

A: axis

Claims (7)

A noise reduction fan device, including: a housing unit, including a housing defining an installation space, a porous plate having a plurality of holes and a plurality of holes that divide the installation space into an air flow region spaced along an axis and a noise reduction cavity , And an air inlet pipe connected to the airflow area, the casing has an air outlet opening in a direction perpendicular to the axis; and a fan wheel is installed in the airflow area and can use the axis as the axis and The airflow is generated by the rotation, so that part of the airflow in the airflow area flows to the noise reduction cavity through the plurality of holes in the porous plate. The noise reduction fan device according to claim 1, wherein the casing of the housing unit has a casing surrounding the airflow region and having one side opening, and a set of casings connected to the casing and surrounding the noise reduction cavity The base, the perforated plate is disposed between the shell and the base, and has a penetrating inner hole, and the air inlet pipe is connected to the inner hole. The noise reduction fan device according to claim 1, wherein the housing of the housing unit has a shell surrounding the airflow area and having one side opening, a set of bases connected to the shell and surrounding the noise reduction cavity The base, the perforated plate is disposed between the shell and the base, the base has a bottom plate located at one end away from the shell and having a through hole, the air inlet pipe is connected to The through hole. The noise reduction fan device according to claim 1, wherein the casing of the housing unit has a perforation along the axis and the porous plate on two opposite sides of the fan wheel respectively, and the air inlet pipe is connected to the perforation. The noise reduction fan device according to any one of claims 1 to 4, further comprising a sound absorbing material disposed in the noise reduction cavity. The noise reduction fan device according to claim 5, wherein the sound absorbing material is a porous material. The noise reduction fan device according to any one of claims 1 to 4, wherein the housing unit further includes a deflector disposed at the air outlet and used to guide the wind.

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