TWI529310B - Fan noise elimination device - Google Patents

Description

Fan noise canceling device

The present invention relates to a noise canceling device, and more particularly to a fan noise canceling device.

When the fan is running, it is easy to form a turbulence at the end of the blade, thereby causing irregular vibration of the air and the blade to generate noise. In order to eliminate the noise generated by the operation of the fan, the prior art usually eliminates the noise by disrupting the turbulence at the end of the blade.

Referring to FIG. 1 , the noise reduction heat dissipation fan 1 disclosed in the new patent of Taiwan Patent No. 481437 includes a fan base 11 surrounding an accommodating space 110, and is disposed in the accommodating space 110 and has a plurality of The fan body 12 of the blade portion 121. The accommodating space 110 has an air outlet 111, and the slat 11 has an inner wall surface 112 surrounding the accommodating space 110. The inner wall surface 112 is spaced apart from the plurality of grooves 113. When the fan body 12 rotates and the air in the accommodating space 110 flows, the gap vortex generated by the blade portions 121 may cancel the eddy current generated in the grooves 113. Therefore, the ends of the blade portions 121 are less likely to generate irregular vibration due to the turbulence, so that the noise reduction effect can be achieved.

Referring to FIG. 2, the cooling fan 2 disclosed in the new patent No. M241515 of Taiwan includes a casing surrounding an installation space 20. The seat 21 and a fan wheel set 22 disposed in the installation space 20. The housing 21 is provided with a plurality of lateral air vents 211. When the fan wheel set 22 rotates, the airflow introduced from the lateral air vents 211 cancels the noise turbulence, so the fan wheel set 22 is less prone to spoiler, thereby reducing noise.

However, since the above methods all damage or cancel the turbulence generated when the fan rotates, when designing the structure that disrupts the turbulence, it must be designed in accordance with the type and rotation parameters of various fans, and it is not applicable to all types. State of the fan. Moreover, even if an air flow in the opposite direction to the spoiler is generated, it is difficult to cause the blade or the air to generate no vibration at all, so that the noise cannot be completely eliminated.

Accordingly, it is an object of the present invention to provide a fan noise canceling device that can be adjusted to eliminate noise with a fan type.

Therefore, the fan noise canceling device of the present invention is suitable for use with a fan, and includes a wind guiding unit surrounding an air guiding space, and an adjusting unit communicating with the air guiding space.

The air guiding space of the air guiding unit is used to guide the airflow of the fan, and has two openings on opposite sides, and the fan is sealed in one of the openings, and has an air inlet end and an air outlet end. The airflow is blown from the air inlet end of the fan and blown out from the air outlet end.

The adjusting unit is connected to a position between the openings of the air guiding unit, and surrounds an adjusting cavity that communicates with the air guiding space and can adjust the volume.

When the fan rotates, a first airflow first enters the wind guide The space re-enters the adjustment chamber and is reflected back from the adjustment chamber to the air guiding space to generate a second air flow. The vibration waveform of the second air flow can cancel the vibration waveform of the first air flow to cancel the noise. Adjusting the volume of the adjustment chamber can change the vibration waveform of the second airflow to match the rotation of various types of fans, and eliminate the noise generated when the fan rotates.

The effect of the invention is that the volume of the adjustment chamber of the adjustment unit is repeatedly adjusted repeatedly, and the vibration waveform of the second airflow can be continuously changed, when the vibration waveform of the second airflow and the vibration wave of the first airflow When the models can cancel each other out, the noise generated by the fan is eliminated by the vibration waveform being completely offset.

3‧‧‧Fan noise canceling device

31‧‧‧Air guide unit

310‧‧‧Guide space

311‧‧‧ openings

32‧‧‧Adjustment unit

320‧‧‧Adjustment chamber

321‧‧‧Shell

322‧‧‧Separator

323‧‧‧ slots

4‧‧‧Fan

41‧‧‧Inlet

42‧‧‧ Wind outlet

A‧‧‧First airflow

B‧‧‧Second airflow

(a) ‧ ‧ vibration mode

(b) ‧‧‧Vibration waveforms

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view illustrating a noise reduction heat dissipation fan disclosed in the Taiwan Patent Publication No. 481437; FIG. A perspective view illustrating a heat dissipating fan disclosed in the Taiwan Patent Publication No. M241515; FIG. 3 is a perspective view showing an embodiment of the fan noise canceling apparatus of the present invention; FIGS. 4 and 5 are schematic views showing the air flow in the implementation FIG. 6 is an exploded perspective view showing an adjustment unit of the embodiment; and FIG. 7 is a waveform diagram illustrating the manner in which noise is eliminated in the embodiment.

Referring to FIG. 3, an embodiment of the fan noise canceling device 3 of the present invention is suitable for use with a fan 4, and includes an air guiding unit 31 surrounding an air guiding space 310, and an adjustment for communicating with the air guiding space 310. Unit 32. In this embodiment, the air guiding unit 31 is an air guiding duct, but the air guiding unit 31 can surround the air guiding space 310, and the air guiding body disclosed in the embodiment is not actually implemented. The tube is limited.

Referring to FIG. 3 to FIG. 5, the air guiding space 310 of the air guiding unit 31 is used to guide the airflow of the fan 4, and has two openings 311 on opposite sides, and the fan 4 is blocked in one of the openings 311. And has an air inlet end 41 and an air outlet end 42. The air flow is blown from the air inlet end 41 of the fan 4, and is blown out from the air outlet end 42. The direction in which the fan 4 is mounted can be directed toward the air guiding space 310 by the air inlet end 41 as shown in FIG. 4, and the air outlet end 42 can be directed toward the air guiding space 310 as shown in FIG. 5.

The adjusting unit 32 is connected to the position between the openings 311 of the air guiding unit 31, and surrounds an adjusting cavity 320 that communicates with the air guiding space 310 and can adjust the volume. The adjusting unit 32 includes a housing 321 surrounding the adjusting cavity 320 and at least one partition 322 disposed in the adjusting cavity 320. The housing 321 has a plurality of slots 323 which are spaced apart to insert the spacers 322 into the set positions. As shown in FIG. 6, when the spacers 322 are inserted into the slots 323, the spacers 322 can be changed. The position is set to separate the adjustment chamber 320 in various different ways, and thereby adjust the volume of the adjustment chamber 320 to communicate with the air guiding space 310. In addition, when the volume of the adjustment chamber 320 is adjusted, two or more separator sheets 322 can be used to generate a plurality of different separation modes. The adjustment chamber 320 performs a more diversified adjustment. It should be particularly noted that the manner of adjusting the adjustment cavity 320 is not limited to the manner in which the separation piece 322 is used for the separation. The manner in which the separation piece 322 is matched with the slots 323 is only one of the embodiments. For example, as long as the volume of the adjustment chamber 320 can be surely adjusted, it is not limited to this embodiment.

Referring to FIG. 4 and FIG. 6 , when the installation direction of the fan 4 is directed toward the air guiding space 310 by the air inlet end 41 , the rotation of the fan 4 causes a first airflow A to be opposite to the fan 4 . The opening 311 enters the air guiding space 310. A part of the first airflow A enters the adjusting cavity 320, and the rest is blown from the air outlet end 42 of the fan 4 through the fan 4. A portion of the first airflow A entering the adjustment chamber 320 is reflected by the adjustment chamber 320 back to the air guiding space 310 to generate a second airflow B. The vibration waveform of the second airflow B and the first airflow A The vibration wave patterns cancel each other to eliminate noise, and adjusting the volume of the adjustment chamber 320 can change the vibration waveform of the second air flow B to match the fan 4 to generate a vibration waveform capable of eliminating noise.

Referring to FIG. 5 and FIG. 6 , when the fan 4 is installed in the direction of the air outlet 42 toward the air guiding space 310 , the fan 4 rotates to open a first airflow A from the same side of the fan 4 . The fan 311 enters the fan 4 and is blown out from the air outlet 42 of the fan 4 to enter the air guiding space 310. After the first airflow A enters the air guiding space 310 through the fan 4, a part of the airflow A enters the adjusting cavity 320, and is reflected by the adjusting cavity 320 back to the air guiding space 310 to generate a second airflow B. The vibration waveform of the second airflow B can cancel the vibration waveform of the first airflow A to eliminate noise. And adjusting the volume of the adjustment cavity 320 can change the vibration mode of the second airflow B.

Referring to FIG. 7 and FIG. 4 and FIG. 5, the fan 4 is mounted in the aspect of FIG. 4 or FIG. 5, and the reverse adjustment is performed a plurality of times to change the amplitude of the vibration waveform (b) of the second airflow B, When the vibration waveform (b) of the second airflow B is the same as the amplitude and frequency of the vibration waveform (a) of the first airflow A, the phase of the waveform after being reflected by the adjustment cavity 320 is sure to be Contrary to the pre-reflection, the vibration waveform (b) of the second airflow B can be surely offset from the vibrational waveform (a) of the first airflow A to eliminate the noise generated by the rotation of the fan 4.

It should be particularly noted that, in the actual adjustment operation, the insertion position of the at least one separator 322 can be repeatedly changed to adjust, and the effect of eliminating noise can be evaluated after each adjustment, and if the adjustment fails. By achieving the effect of eliminating noise, the adjustment mode of the adjustment chamber 320 can be changed again, and the test can be repeated to achieve the effect of eliminating noise for the installed fan 4.

In summary, by adjusting the volume of the adjustment cavity 320, the vibration waveform (b) generated by the second airflow B can be changed for various installed fans 4 to generate offsetting the first airflow A. The vibration mode (b) of the vibration mode (a) is used to eliminate the noise generated when the fan 4 rotates, and the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change and modification of the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

3‧‧‧Fan noise canceling device

31‧‧‧Air guide unit

310‧‧‧Guide space

311‧‧‧ openings

32‧‧‧Adjustment unit

320‧‧‧Adjustment chamber

321‧‧‧Shell

322‧‧‧Separator

323‧‧‧ slots

4‧‧‧Fan

Claims (5)

A fan noise canceling device is suitable for use with a fan, and includes: a wind guiding unit surrounding an air guiding space for guiding the airflow of the fan, the air guiding space having two openings on opposite sides, and The fan is sealed in one of the openings and has an air inlet end and an air outlet end; and an adjusting unit is connected to the position between the openings of the air guiding unit, and surrounds the wind guide An adjustment chamber that is connected to the space and capable of adjusting the volume, wherein the adjustment unit includes a housing surrounding the adjustment chamber, and at least one spacer disposed in the adjustment chamber, the spacer is configured to separate Adjusting the cavity to adjust the volume of the adjustment cavity to communicate with the air guiding space; when the fan rotates, a first airflow first enters the air guiding space and then enters the adjusting cavity, and is reflected back by the adjusting cavity The air guiding space generates a second air flow, the vibration wave pattern of the second air flow can cancel the vibration wave pattern of the first air flow to cancel the noise, and adjusting the volume of the adjusting cavity can change the second air flow. Moving wave. The fan noise canceling device of claim 1, wherein the housing has a plurality of slots spaced apart for the spacer to be inserted into the set position. The fan noise canceling device according to any one of claims 1 to 2, wherein the air inlet end of the fan faces the air guiding space. The fan noise canceling device according to any one of claims 1 to 2, wherein the air outlet end of the fan faces the air guiding space. The fan noise canceling device of claim 1, wherein the air guiding unit is an air guiding duct.