CN218768042U - Noise reduction desktop computer host case with Helmholtz resonant cavity - Google Patents
Noise reduction desktop computer host case with Helmholtz resonant cavity Download PDFInfo
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- CN218768042U CN218768042U CN202223171962.2U CN202223171962U CN218768042U CN 218768042 U CN218768042 U CN 218768042U CN 202223171962 U CN202223171962 U CN 202223171962U CN 218768042 U CN218768042 U CN 218768042U
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- resonant cavity
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- helmholtz
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Abstract
The utility model belongs to the computer computing field, in particular to desktop computer host computer machine case of making an uproar falls with helmholtz resonant cavity. The utility model provides a desktop computer host computer machine case of making an uproar falls with helmholtz resonant cavity, includes the case lid of box and box side, is provided with detachable helmholtz resonant cavity silencer on the case lid of left side wall and/or right side wall, helmholtz resonant cavity silencer realizes eliminating the noise of different frequency bands through adjusting the cavity size. The utility model discloses a mode that sets up the Helmholtz resonant cavity comes to fall the noise that quick-witted incasement portion produced and makes an uproar, realizes falling the pertinence of noise to different frequency channels through the volume that changes the Helmholtz resonant cavity and makes an uproar. The utility model provides the high effect of making an uproar and not influencing the heat dispersion of quick-witted case passively has higher practicality.
Description
Technical Field
The utility model belongs to the computer computing field, in particular to desktop computer host computer machine case of making an uproar falls with helmholtz resonant cavity.
Background
When the desktop computer runs, various fans used by hardware devices such as an underwater sound radiator, an air cooling radiator, a video card radiator and the like can generate noise, and peripheral operators are affected. At present, the desktop computer case with the noise reduction function is based on a passive noise reduction technology, noise is absorbed by additionally arranging a sound absorption material with a certain thickness in the computer host case, the noise volume is controlled by adjusting the thickness of the sound absorption material, the noise reduction mode cannot perform targeted noise reduction on certain frequency bands with concentrated noise energy, and the heat dissipation performance of the case is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of existing passive technique of making an uproar of falling and provide a desktop computer machine case of making an uproar falls with helmholtz resonant cavity.
The purpose of the utility model is realized like this: the utility model provides a desktop computer host computer machine case of making an uproar falls with helmholtz resonant cavity, includes the case lid of box and box side, is provided with detachable helmholtz resonant cavity silencer on the case lid of left side wall and/or right side wall, helmholtz resonant cavity silencer realizes eliminating the noise of different frequency bands through adjusting the cavity size.
Preferably, the helmholtz resonator muffler includes a communicating pipe and a helmholtz resonator; the Helmholtz resonant cavity is communicated with the tank body through the communicating pipe; and a cavity adjusting device is arranged in the Helmholtz resonant cavity.
Furthermore, the cavity adjusting device comprises a piston, an adjusting shifting sheet connected with the piston, a clamping groove and a cover sheet; the top of the Helmholtz resonant cavity is provided with a guide groove which is horizontally arranged; the piston is vertically arranged in the cavity, the top of the piston is connected with the adjusting shifting piece, and the adjusting shifting piece is positioned in the guide groove; a cover plate is arranged below the guide groove; two ends of the cover plate are connected with the side wall of the Helmholtz resonant cavity through springs; the piston penetrates through the cover plate and is connected with the cover plate in a sealing way, and the lower end of the piston is connected with the clamping groove in a contact way; the clamping groove is formed in the bottom of the Helmholtz resonant cavity.
Furthermore, the bottom, the top, the front side wall and the rear side wall of the box body are provided with miniature microphones for receiving noise inside the case.
Furthermore, the miniature microphone that the bottom of box set up passes through 3.5mm audio frequency mouth, the usb mouth of subsidiary on the wire connection box, with quick-witted case internal noise information transmission to computer mainboard and save and analysis.
Furthermore, the front side wall and the rear side wall of the box body are both provided with sound-absorbing cotton.
Furthermore, the sound-absorbing cotton is polyester fiber sound-absorbing cotton with the thickness of 5 mm.
The utility model discloses a mode that sets up the Helmholtz resonant cavity comes to fall the noise that quick-witted incasement portion produced and makes an uproar, realizes falling the pertinence of noise to different frequency channels through the volume that changes the Helmholtz resonant cavity and makes an uproar. The utility model provides the high effect of making an uproar and not influencing the heat dispersion of quick-witted case passively has higher practicality.
Drawings
FIG. 1 is a schematic structural diagram of a computer host case noise reduction device based on Helmholtz resonant cavity;
FIG. 2 is a schematic diagram of the internal structure of the noise reduction device of the computer mainframe based on the Helmholtz resonant cavity of the present invention;
FIG. 3 is a schematic view of a Helmholtz resonator muffler structure;
the microphone comprises a box body 1, a side cover 2, a micro microphone 3, sound absorbing cotton 4, a Helmholtz resonant cavity silencer 5, a communicating pipe 6, a Helmholtz resonant cavity 7, a piston 8, an adjusting plectrum 9, a guide groove 10, a spring 11, a cover plate 12 and a clamping groove 13.
Detailed Description
In order to facilitate understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
And the left side cover 2 and the right side cover 2 of the box body 1 are respectively provided with a helmholtz resonant cavity silencer 5 which can be detached. The cross section of the helmholtz resonant cavity muffler is shown in fig. 3, and comprises a communicating pipe 6 and a helmholtz resonant cavity 7 with adjustable volume, wherein the case 1 is connected into the helmholtz resonant cavity 7 through the communicating pipe 6.
In order to adjust the volume of the helmholtz resonant cavity 7, a piston 8 is arranged inside the helmholtz resonant cavity 7, a cover plate 12 and a spring 11 connected with the cover plate are arranged on the inner side of the top of the helmholtz resonant cavity 7, the other end of the spring is fixed on the inner side wall of the helmholtz resonant cavity 7, a clamping groove 13 is arranged at the bottom of the spring, and the lower end of the piston 8 is in contact fit with the clamping groove 13. The top of the piston 8 is provided with an adjusting plectrum 9.
A guide groove 10 for horizontally moving the adjustment paddle 9 is provided on the top of the Helmholtz resonance chamber 7 and above the cover plate 12. The adjustment plectrum 9 is pushed to move left and right along the guide groove 10, so that the position of the piston 8 can be changed, and the volume of the Helmholtz resonant cavity 7 is adjusted. In the horizontal movement process of the adjusting plectrum 9, the guide groove 10 is shielded by the cover plate 12 and the spring 11, so that the Helmholtz resonant cavity is always kept in a sealed state. The piston 8 passes through the inside of the cover plate 12 in a sealing connection, and the piston 8 can move in the vertical direction relative to the cover plate 12. The working process is expressed as follows: the adjusting poking piece 9 and the piston 8 which is hard connected with the adjusting poking piece need to be lifted slightly in the vertical direction, so that the lower end of the piston 8 leaves the clamping groove 13, when the adjusting poking piece 9 drives the piston 8 which is hard connected with the adjusting poking piece to move horizontally, the springs 11 and the cover plate 12 on two sides of the piston synchronously move horizontally along with the piston 8, and a gap generated by the fact that the guide groove 10 is formed in the top of the Helmholtz resonant cavity due to translation of the adjusting poking piece and the piston is shielded, so that the Helmholtz resonant cavity is always kept in a closed state. When the adjusting shifting piece 9 and the piston 8 move to proper positions, the piston 8 can be inserted into the corresponding position of the clamping groove 13 for fixing by pressing down the adjusting shifting piece 9, and all the above-mentioned structures are kept in a static state.
As shown in FIG. 3, communication pipe 6 has a cross-sectional area and a length A and l, respectively 1 The volume of the rear Helmholtz resonant cavity 7 is V, and the side lengths of the cross section of the case are d and l respectively 2 C is the speed of sound in air, and f is the frequency of noise in the cabinet. According to the working principle of the Helmholtz resonant cavity, the resonant frequency f of the Helmholtz resonant cavity silencer is known r And the transmission loss TL is given by:
according to the above formula, the frequency of the helmholtz resonator can be changed by the volume of the helmholtz resonator 7 and the cross-sectional area of the communicating pipe 6, and the noise reduction peak is at the resonance frequency. For example, 200-400hz of noise exists in the chassis, and the noise in the chassis is the most at f =300 according to software analysisAt a high value, the size of the Helmholtz resonator is varied, let f r =300, where attenuation TL (f = 300) is maximal, producing a noise reduction effect.
The volume of the helmholtz resonator is adjusted by shifting the position of the adjusting driver 9 disposed in the guide slot 10 to drive the piston 8 disposed in the helmholtz resonator 7. Through analyzing the size of common atx quick-witted case, m-atx quick-witted case, e-atx quick-witted case on the market, the utility model discloses in set up three grades of volume size adjustment gears, the helmholtz resonant cavity volume after the regulation is 0.875, 0.667 and 0.5 respectively with former volume ratio. During use, the adjusting plectrum can be stirred to a corresponding gear or can be manually adjusted more finely.
The polyester fiber sound absorption cotton 4 additionally arranged on the inner wall of the case body can effectively absorb medium-high frequency noise in the case, the micro microphones placed at the bottom, the top, the front side and the rear side of the case can collect the noise in the case after the sound absorption cotton absorbs the sound, the signals are transmitted to a computer, the fan rotating speed obtained by frequency analysis of computer audio software and combination of a computer fan sensor (which can be read out in a computer system and is marked and matched with a computer fan rotating speed sensor on most computer mainboards sold in the market) is obtained, the power spectral density function of the noise in the case is finally obtained, the peak frequency band of the noise in the case can be read out through a graph, and then the noise reduction in a specific frequency bandwidth range can be realized by adjusting the volume of a Helmholtz resonant cavity. In this embodiment, the helmholtz noise reduction adjustment dial can be used to perform targeted noise reduction according to different noise main bodies such as a cpu fan and a graphics card fan inside the computer.
To sum up, the beneficial effects of the utility model are that, simple structure, spare part installation are dismantled the volume of convenience, helmholtz resonant cavity and can be adjusted to the realization carries out effective noise reduction to a plurality of frequency channel noises.
The above embodiments are only examples of the present invention, and are not intended to limit the present invention, and to those skilled in the art, the present invention can be modified and changed in various ways, all within the spirit and principle of the present invention, and any modification, equivalent replacement, improvement, etc. should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a desktop computer host computer machine case of making an uproar falls with helmholtz resonant cavity, includes the case lid of box and box side, its characterized in that: the cabinet cover of the left side wall and/or the right side wall is/are provided with detachable Helmholtz resonant cavity silencers, and the Helmholtz resonant cavity silencers eliminate noises with different frequency bands by adjusting the size of the cavity; the Helmholtz resonant cavity muffler comprises a communicating pipe and a Helmholtz resonant cavity; the Helmholtz resonant cavity is communicated with the tank body through the communicating pipe; and a cavity adjusting device is arranged in the Helmholtz resonant cavity.
2. The noise-reducing desktop computer mainframe chassis with a helmholtz resonator of claim 1, wherein: the cavity adjusting device comprises a piston, an adjusting shifting sheet connected with the piston, a clamping groove and a cover sheet; the top of the Helmholtz resonant cavity is provided with a guide groove which is horizontally arranged; the piston is vertically arranged in the cavity, the top of the piston is connected with the adjusting shifting sheet, and the adjusting shifting sheet is positioned in the guide groove; a cover plate is arranged below the guide groove; two ends of the cover plate are connected with the side wall of the Helmholtz resonant cavity through springs; the piston penetrates through the cover plate and is connected with the cover plate in a sealing way, and the lower end of the piston is connected with the clamping groove in a contact way; the clamping groove is arranged at the bottom of the Helmholtz resonant cavity.
3. The noise-reducing desktop computer mainframe chassis with a helmholtz resonator of claim 1, wherein: the bottom, the top, the front side wall and the rear side wall of the box body are all provided with miniature microphones for receiving noise inside the case.
4. The noise-reducing desktop computer mainframe chassis with a Helmholtz resonant cavity of claim 3, wherein: the miniature microphone that the bottom of box set up passes through 3.5mm audio frequency mouth, the usb mouth of subsidiary on the wire connection box, with quick-witted incasement noise information transmission to computer mainboard save and analysis.
5. The noise reducing desktop computer mainframe chassis with a helmholtz resonator of claim 1, wherein: the front side wall and the rear side wall of the box body are both provided with sound-absorbing cotton.
6. The noise-reducing desktop computer mainframe chassis with a Helmholtz resonant cavity of claim 5, wherein: the sound-absorbing cotton is polyester fiber sound-absorbing cotton with the thickness of 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223171962.2U CN218768042U (en) | 2022-11-28 | 2022-11-28 | Noise reduction desktop computer host case with Helmholtz resonant cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223171962.2U CN218768042U (en) | 2022-11-28 | 2022-11-28 | Noise reduction desktop computer host case with Helmholtz resonant cavity |
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| CN218768042U true CN218768042U (en) | 2023-03-28 |
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| CN202223171962.2U Active CN218768042U (en) | 2022-11-28 | 2022-11-28 | Noise reduction desktop computer host case with Helmholtz resonant cavity |
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| CN (1) | CN218768042U (en) |
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- 2022-11-28 CN CN202223171962.2U patent/CN218768042U/en active Active
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