CN219891626U

CN219891626U - Heat abstractor with noise reduction mechanism

Info

Publication number: CN219891626U
Application number: CN202320768923.6U
Authority: CN
Inventors: 林俊宏
Original assignee: MICROLOOPS CORP; Huizhou Huiliqin Electronic Technology Co ltd
Current assignee: MICROLOOPS CORP; Huizhou Huiliqin Electronic Technology Co ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-10-24
Anticipated expiration: 2033-04-07

Abstract

The utility model relates to a heat dissipating device with a noise reduction mechanism, which comprises a base body, a cover body, a fan, a heat dissipating fin group and a noise reduction module, wherein the cover body corresponds to the cover of the base body and forms a containing cavity between the cover body and the cover body; the fan is arranged in the accommodating cavity and is configured corresponding to the air inlet, and the fan is provided with fan blades; the radiating fin group is arranged in the accommodating cavity and is configured corresponding to the air outlet; the noise reduction module can emit noise reduction sound, and is arranged on one of the cover body and the radiating fin group, so that the noise reduction sound can be noise emitted when the fan blades rotate. Therefore, the heat dissipation efficiency of the whole device is improved, and the noise problem of interference can be effectively overcome.

Description

Heat abstractor with noise reduction mechanism

Technical Field

The present utility model relates to a heat dissipating device, and more particularly to a heat dissipating device with noise reduction mechanism.

Background

At present, the display chip of the display card for processing images also greatly improves the operation capability due to the improvement of the drawing software and the display function thereof, and the heating problem and the heat dissipation problem of the Graphic Processing Unit (GPU) are correspondingly caused, so that the display card also becomes an important research subject; similarly, there are problems to be solved in a Central Processing Unit (CPU) of a motherboard for a computer.

In the conventional heat dissipation designs of display cards, besides the water cooling method, there are still some display cards that use air cooling (or air cooling) to dissipate heat, and the common method is to blow off the heat generated by the electronic heat source by a fan to achieve the purpose of heat dissipation, wherein a large amount of air flow is provided by increasing the rotation speed of the fan, which is the simplest and economical method. However, this method has a large noise generation.

Disclosure of Invention

An objective of the present utility model is to provide a heat dissipating device with a noise reduction mechanism, which not only improves the heat dissipating efficiency of the whole device, but also effectively overcomes the noise problem of interference by the arrangement of the noise reduction module.

In order to achieve the above-mentioned objective, the present utility model provides a heat dissipating device with noise reduction mechanism, comprising a base, a cover, a fan, a heat dissipating fin set and a noise reduction module, wherein the cover corresponds to the cover of the base and forms a cavity therebetween, and the cover is provided with an air inlet and an air outlet communicating with the cavity; the fan is arranged in the accommodating cavity and is configured corresponding to the air inlet, and the fan is provided with a plurality of fan blades; the radiating fin group is arranged in the accommodating cavity and is configured corresponding to the air outlet; the noise reduction module can emit noise reduction sound, and is arranged on one of the cover body and the radiating fin group, so that the noise reduction sound can cancel noise emitted by each fan blade when the fan blade rotates.

The utility model relates to a heat dissipating device with a noise reduction mechanism, wherein the noise reduction module comprises a reference microphone, an error microphone, an active noise reduction controller and a loudspeaker which are electrically connected with each other.

The cover body comprises a panel, and the noise reduction module is positioned on the inner side surface of the panel and is arranged adjacent to the air outlet.

The utility model relates to a heat dissipating device with a noise reduction mechanism, wherein the cover body comprises a panel, and the noise reduction module is positioned on the inner side surface of the panel and is adjacent to the fan.

The heat dissipating device with noise reducing mechanism includes several heat dissipating fins in interval arrangement, and the noise reducing module is set near the fan and outside the heat dissipating fins.

The heat dissipating device with the noise reducing mechanism comprises a plurality of heat dissipating fins arranged at intervals, wherein the noise reducing module is positioned on the outer surface of the outermost heat dissipating fin and is positioned in the middle.

The heat dissipating device with the noise reducing mechanism comprises a plurality of heat dissipating fins arranged at intervals, wherein the noise reducing module is positioned on the outer surface of the outermost heat dissipating fin and is adjacent to the air outlet.

As a heat dissipating device with a noise reduction mechanism, the noise reduction module is electrically connected with the fan.

As a heat dissipating device with a noise reduction mechanism, the noise reduction module is electrically connected with an electronic device.

The heat dissipating device with noise reducing mechanism includes several heat dissipating fins in interval arrangement, and one gas flow passage formed between two adjacent heat dissipating fins and parallel to each other.

Drawings

Fig. 1 is a perspective view of a heat sink assembly with noise reduction mechanism according to the present utility model.

Fig. 2 is a front view of a heat dissipating device assembly with noise reduction mechanism according to the present utility model.

Fig. 3 is a sectional view of a heat dissipating device with noise reduction mechanism according to the present utility model.

Fig. 4 is a combined front view of another embodiment of the present utility model.

Fig. 5 is a combined cross-sectional view of another embodiment of the present utility model.

FIG. 6 is a block diagram of a fan and noise reduction module according to the present utility model.

In the figure:

10, a seat body; 20, a cover body; a panel 21; 211, an air inlet; 212, an air outlet; 22, an upper side plate; 23, a lower side plate; 24, right side plate; 30, a fan; 31, fan blades; 40, radiating fin group; 41, radiating fins; 42, gas flow passage; 50, a noise reduction module; 51 a reference microphone; 52, error microphone; 53, an active noise reduction controller; 54, a speaker; 8, a display card; a is a containing cavity; d (n) noise signal; e (n) error signal; f (n) broadband noise signals; y (n) is an inverse noise signal; y' (n) corrected inverted noise signal; SMIC: speaker control signal.

Detailed Description

The detailed description and technical content of the present utility model are described below with reference to the drawings, which are, however, provided for reference and illustration only and are not intended to limit the present utility model.

Referring to fig. 1 to 3, the present utility model provides a heat dissipating device with a noise reduction mechanism, which can be applied to a display card 8, and mainly includes a base 10, a cover 20, a fan 30, a heat dissipating fin set 40 and a noise reduction module 50.

The base 10 is a rectangular frame, and is formed by connecting a plurality of (more than two) side plates and a plurality of supporting rods together, and a plurality of studs are arranged at corresponding positions of each side plate so as to provide the penetration and locking of locking elements such as screws.

The cover 20 is covered by the corresponding seat 10 and formed on one side thereof, and a cavity A is formed between the seat 10 and the cover 20. The cover 20 may be made of metal, and has a substantially rectangular shape, and mainly includes a panel 21, an upper side plate 22, a lower side plate 23 and a right side plate 24 extending perpendicularly from the panel 21, wherein the upper side plate 22 and the lower side plate 23 are in a corresponding side position relationship. An air inlet 211 communicating with the cavity a is provided in the middle of the panel 21, and an air outlet 212 is provided on the left sides of the panel 21, the upper side plate 22 and the lower side plate 23.

The fan 30 is disposed in the cavity a and is disposed corresponding to the air inlet 211, and the fan 30 has a plurality of blades 31, and each blade 31 may be made of metal. The fan 30 mainly uses a motor to drive each fan blade 31 to rotate, so as to bring cooler air into the cavity a from the air inlet 211, and discharge hotter air from the cavity a from the air outlet 212, thereby achieving the heat dissipation effect. In the present utility model, the fan 30 is operated according to the fan control signal, and the larger the fan control signal, the faster the motor speed in the fan 30, the stronger the heat dissipation effect, but the larger the noise is generated. In one embodiment, the fan control signal may be a pulse width modulated (Pulse Width Modulation, PWM) square wave signal, which adjusts the motor speed in the fan 30 by changing its duty cycle. In an embodiment, the fan 30 may include one or more axial fans or centrifugal fans. However, the number of fans, the type of fans, and the manner in which the fans 30 are driven do not limit the scope of the present utility model.

The noise source of the fan 30 during operation is from the air flow caused by the rotation of the motor, wherein the narrow frequency component may be derived from thickness noise caused by volumetric displacement generated by the movement of the blades 31, or BPF (blade passing frequency ) noise caused by the variable loading force (axial lift and fan plane tension) on the surfaces of the blades 31. Since the BPF and associated harmonics are related to the pressure disturbances generated as each blade 31 passes through a fixed reference point, a specific narrow frequency noise is generated when the tips of the blades 31 generate periodic pressure waves. On the other hand, when the air flows through the fan blade 31, it is peeled off from the boundary layer (boundary layer) of the fan blade 31 or from both sides of the blade tip to form an alternate vortex, which is called vortex peeling (vortex peeling). The vortex stripping can make the instantaneous speeds of the fluids at two sides of the fan blade 31 different, and the instantaneous pressures applied to two sides of the fan blade 31 at different fluid speeds also different, so that the fan blade 31 can vibrate to generate specific broadband noise.

The heat dissipation fin set 40 is disposed in the cavity a and corresponds to the air outlet 212, the heat dissipation fin set 40 includes a plurality of heat dissipation fins 41 arranged at intervals, and a gas flow channel 42 is formed between any two adjacent heat dissipation fins 41, and each gas flow channel 42 is parallel to each other and corresponds to the air flow blown by each fan blade 31 of the fan 30.

The noise reduction module 50 is disposed in one of the cover 20 and the heat radiation fin group 40; when provided in the housing 20, may be positioned on an inside surface of the panel 21 and disposed adjacent to the fan 30 (as shown in FIG. 3). When disposed on the fin set 40, the fin set may be disposed on the outer surface of the outermost fin 41 and adjacent to the fan 30, the middle of the fin 41 or the air outlet 212.

Referring to fig. 4 and 5, the heat dissipating device with noise reduction mechanism of the present utility model can be used in addition to the above embodiments, wherein the noise reduction module 50 can also be located on the inner surface of the panel 21 and is disposed adjacent to the air outlet 212; the rest of the architecture is the same as the previous embodiments.

Referring to fig. 6, the noise reduction module 50 mainly includes a reference microphone 51, an error microphone 52, an active noise reduction (Active Noise Cancellation, ANC) controller 53 and a speaker 54, and the above components are electrically connected through a circuit board or a conductive wire (not shown), wherein the noise reduction module 50 may be electrically connected to the fan 30, or may be electrically connected to the display card 8 or other peripheral electronic devices (not shown) if disposed at a position far from the fan 30.

The reference microphone 51 is disposed near each blade 31 of the fan 20, and is used for collecting noise generated during operation of the fan 20 and transmitting a measured broadband noise signal f (n) to the active noise reduction controller 53, wherein the broadband noise signal f (n) includes a broadband noise spectrum of airflow noise generated during operation of the fan 20. In one embodiment, the reference microphone 51 may be a digital micro-electromechanical system (Micro Electro Mechanical System, MEMS) microphone that has high heat resistance, high vibration resistance, high radio frequency interference resistance, and the like. However, the kind of the reference microphone 51 does not limit the scope of the present utility model.

The error microphone 52 is used for collecting the overall noise generated when each fan blade 31 of the fan 30 is operated, and outputting a corresponding error signal e (n) to the active noise reduction controller 53, wherein the noise signal d (n) represents the noise signal to be eliminated during the operation of each fan blade 31. Since fan 20 is the primary noise source, error microphone 52 may be positioned proximate to fan 30, wherein the distance between reference microphone 51 and active noise reduction controller 53 is greater than the distance between error microphone 52 and active noise reduction controller 53. Error microphone 52 may detect noise through a primary path and secondary paths: the main path is related to the signal transmission path between the fan 30 and the error microphone 52, through which the noise signal d (n) is collected; the secondary path is associated with the signal transfer path between speaker 54 and error microphone 52, through which a corrected inverted noise signal y' (n) is collected, which is one of the associated inverted noise signals y (n). More specifically, the error signal e (n) output from the error microphone 52 is the difference between the noise signal d (n) and the corrected inverted noise signal y' (n), and a smaller value of the error signal e (n) indicates a better noise reduction effect. In one embodiment, the error microphone 52 may be a digital MEMS microphone having high heat resistance, high vibration resistance, high radio frequency interference resistance, and the like. However, the type of error microphone 52 does not limit the scope of the present utility model.

The active noise reduction controller 53 may receive a synchronization signal including a qualification of the structure (e.g., number of fan blades) and operational settings (e.g., motor speed in different modes) of the associated fan 30, a wideband noise signal f (n) from the reference microphone 51, and an error signal e (n) from the error microphone 52. Based on the synchronization signal and the wideband noise signal f (n), the active noise reduction controller 53 can calculate wideband noise among noises generated by the fan module 20 during actual operation; based on the synchronization signal and the error signal e (n), the active noise reduction controller 53 can calculate the narrow-band noise among the noises generated by the fan 30 during the actual operation. Based on the calculated wide-band noise and narrow-band noise, the active noise reduction controller 53 may provide a speaker control signal to drive the speaker 54 in order to effectively cancel the noise signal d (n) by the inverted noise signal y (n) provided by the speaker 54, i.e., to reduce the error signal e (n) to 0 as much as possible.

The speaker 54 is an electronic component that converts an electronic signal into an acoustic signal, and generally includes a diaphragm (speaker) and a driving circuit composed of an electromagnet and a voice coil. The speaker 54 may operate according to a speaker control signal provided by the active noise reduction controller 53, when the current of the speaker control signal passes through the voice coil, the voice coil vibrates along with the frequency of the current, and the diaphragm connected to the voice coil naturally vibrates, so as to drive the surrounding air to vibrate to generate a noise reduction sound. In the embodiment of the present utility model, the diaphragm of the speaker 54 may generate an inverse noise signal y (n) according to the speaker control signal.

The above-described embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model. The protection scope of the utility model is subject to the claims.

Claims

1. A heat sink with noise reduction mechanism, comprising:

a base;

a cover body corresponding to the cover of the seat body and forming a containing cavity therebetween, wherein the cover body is provided with an air inlet and an air outlet communicated with the containing cavity;

the fan is arranged in the containing cavity and is configured corresponding to the air inlet, and the fan is provided with a plurality of fan blades;

the radiating fin group is arranged in the accommodating cavity and is configured corresponding to the air outlet; and

the noise reduction module can emit noise reduction, and is arranged on one of the cover body and the radiating fin group so that the noise reduction module can reduce noise emitted by each fan blade when the fan blade rotates.

2. The heat dissipating device with noise reduction mechanism of claim 1, wherein the noise reduction module comprises a reference microphone, an error microphone, an active noise reduction controller and a speaker electrically connected to each other.

3. The heat dissipating device with noise reduction mechanism as set forth in claim 1, wherein the cover comprises a panel, and the noise reduction module is disposed adjacent to the air outlet and on an inner surface of the panel.

4. The heat dissipating device with noise reduction mechanism of claim 1, wherein the housing comprises a panel, and the noise reduction module is disposed adjacent to the fan and on an inner surface of the panel.

5. The heat dissipating device with noise reduction mechanism of claim 1, wherein the set of heat dissipating fins comprises a plurality of heat dissipating fins arranged at intervals, and the noise reduction module is located on an outer surface of the outermost heat dissipating fin and is disposed adjacent to the fan.

6. The heat dissipating device with noise reduction mechanism of claim 1, wherein the set of heat dissipating fins comprises a plurality of heat dissipating fins arranged at intervals, and the noise reduction module is located at an outer surface of the outermost heat dissipating fin and at a middle.

7. The heat dissipating device with noise reduction mechanism as set forth in claim 1, wherein the heat dissipating fin set comprises a plurality of heat dissipating fins arranged at intervals, and the noise reducing module is located on an outer surface of the outermost heat dissipating fin and is disposed adjacent to the air outlet.

8. The heat dissipating device with noise reduction mechanism as set forth in claim 1, wherein the noise reduction module is electrically connected to the fan.

9. The heat dissipating device with noise reduction mechanism of claim 1, wherein the noise reduction module is electrically connected to an electronic device.

10. The heat dissipating device with noise reduction mechanism as set forth in claim 1, wherein the heat dissipating fin set comprises a plurality of heat dissipating fins arranged at intervals, and a gas flow passage is formed between any two adjacent heat dissipating fins, and each gas flow passage is parallel to each other.