CN105555103A - Single board and simulative single board based on balance between improvement of thermal dissipation capability and reduction of noise emission - Google Patents
Single board and simulative single board based on balance between improvement of thermal dissipation capability and reduction of noise emission Download PDFInfo
- Publication number
- CN105555103A CN105555103A CN201610009745.3A CN201610009745A CN105555103A CN 105555103 A CN105555103 A CN 105555103A CN 201610009745 A CN201610009745 A CN 201610009745A CN 105555103 A CN105555103 A CN 105555103A
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- noise reduction
- box body
- water conservancy
- conservancy diversion
- veneer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0213—Venting apertures; Constructional details thereof
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention discloses a single board and a simulative single board based on balance between improvement of thermal dissipation capability and reduction of noise emission. The single board based on balance between improvement of thermal dissipation capability and reduction of noise emission comprises a box body capable of providing air flow in the interior; the two ends of the box body are open to form an air inlet and an air outlet; noise reduction flow guide modules are arranged on any inner side faces of the box body in a protruding manner; and the protruding directions of the noise reduction flow guide modules are perpendicular to the air flow direction in the box body. According to the single board provided by the invention, different noise reduction flow guide modules perpendicular to the air flow direction are arranged in different communication equipment single boards, so that cooled air can pass through components and parts requiring to be cooled in an efficient and balanced manner; meanwhile, the noise reduction flow guide modules can eliminate noises generated in the cooling process; therefore, the contradiction between improvement of thermal dissipation capability and requirement for lowering noise emission existing in the communication equipment is solved; instead, the thermal dissipation capability of the equipment is improved while the noise emission of the equipment is lowered; and meanwhile, the occupied space of the equipment in installation is not enlarged.
Description
Technical field
The present invention relates to heat radiation and noise control technique, be specifically related to a kind of based on heat radiation balance with noise reduction the veneer and analog veneer that are coupled.
Background technology
Along with the power consumption of communication equipment constantly increases, the heat dissipation problem of equipment becomes more and more outstanding, and Traditional solutions is exactly constantly increase the rotating speed of radiator fan and blast to provide enough cooling-airs.But this method not only significantly adds power consumption, and the noise emission of equipment is sharply increased, the routine work of people, life and health are brought and has a strong impact on.Statistics shows, is exposed in the environment of sound pressure level 85dBA, and in 5 years, risk of hearing impairment for conversation sound is 1%, and to be exposed to sound pressure level be in the environment of 90dBA, and in 5 years, risk of hearing impairment for conversation sound reaches 4%.
For solving the noise problem of communication equipment, noise control technique progressively obtains application, such as, to fix a silencer structural member at equipment air outlet.And existing muffler mostly is the loose structure be interconnected, when sound wave incident is inner to deadener, excite the vibration of air molecule and deadener grain, due to the viscosity between air molecule and the rubbing action between air and grain, make the Conversion of Energy of sound wave be heat energy and loss.
In communication equipment noise reduction field, for reducing noise of equipment to the impact of environment, existing noise reduction schemes muffler being arranged on equipment air outlet side, such as Chinese invention patent CN102110442B discloses one " a kind of muffler device for single board zone of communication equipment ", this noise eliminator is the principle utilizing microperforated panel to eliminate the noise, the pcb board of equipment veneer is become micropunch plate muffler with the floor combination of equipment veneer, compare and fix a silencer at equipment air outlet, this scheme does not need the installing space of the denoising structure part outside occupying volume.
Although such scheme solves a part of noise problem of equipment, but still there are some application restriction and shortcomings, such as increase muffler at equipment air outlet, but muffler can take the channel space in the installing space of equipment within machine cabinet or machine room, thus reduce the space availability ratio of rack and machine room; Again due to the limited space between base plate and pcb board, the simultaneously wiring restriction of each layer of pcb board and the arrangement of micropunch and limited amount, the therefore noise reduction of this muffler and radiating effect not obvious.
Summary of the invention
Technical problem to be solved by this invention is the problem that the veneer of existing communication equipment can not have good thermal diffusivity and anti-acoustic capability concurrently.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention be to provide a kind of based on heat radiation balance with noise reduction the veneer be coupled, comprising inside can for the box body of air current flow, the open at both ends of described box body also forms air inlet and air outlet respectively, any medial surface of described box body is arranged in the prominent part of noise reduction water conservancy diversion module, the projected direction of described noise reduction water conservancy diversion module is perpendicular to the flow direction of air-flow in described box body.
In such scheme, the section of described noise reduction water conservancy diversion module is isosceles trapezoid, the upper base of described noise reduction water conservancy diversion module is towards the inside of described box body, going to the bottom of described noise reduction water conservancy diversion module is connected with the inwall of described box body, and two waists of described noise reduction water conservancy diversion module are respectively towards described air inlet and air outlet.
In such scheme, the outside of described noise reduction water conservancy diversion module is protective layer, and the outer surface of described protective layer is evenly equipped with through hole, is filled with sound-absorbing material in described protective layer.
In such scheme, described box body is removably connected in turn by front panel, the rear board being configured with connector, upper cover plate and base plate and forms.
In such scheme, the components and parts being provided with pcb board in described box body and being located on described pcb board, described noise reduction flow-guiding structure is two and is arranged at the both sides of described components and parts.
In such scheme, the material of described protective layer is panel beating, plastic cement or glass fabric, and described sound-absorbing material is the polyurethane of loose structure, melamine, foaming or agglomerated material, and the fire-protection rating of described sound-absorbing material is more than HBF.
In such scheme, described pcb board is also provided with radiating module, described radiating module is located at the center of described box body.
This programme additionally provide a kind of based on heat radiation balance with noise reduction the analog veneer be coupled, can be made up of for the box body of air current flow inside, the two ends of described box body have opening and form air inlet and air outlet respectively, be furnished with several noise reduction water conservancy diversion modules in described box body, described noise reduction water conservancy diversion module is divided into several gas channels by described box body.
In such scheme, described noise reduction water conservancy diversion module is several bar shapes, and each described noise reduction water conservancy diversion module is uniform along the depth direction of described box body, forms gas channel between described noise reduction water conservancy diversion module and the inwall of described box body.
In such scheme, described noise reduction water conservancy diversion module is a plate body equal with described box body width, described noise reduction water conservancy diversion module is arranged along the short transverse of described box body and is posted by the bottom surface of described box body, forms a gas channel between described noise reduction water conservancy diversion module and the inwall of described box body.
The present invention, by vertical from air flow direction in different communication equipment veneers, different noise reduction water conservancy diversion modules is set, the components and parts of the needs heat radiation that cooling-air is efficiently balancedly passed through in box body, noise reduction water conservancy diversion module eliminates consequent noise simultaneously, the heat-sinking capability solved existing for communication equipment promotes and reduces the contradiction of noise emission demand, while lifting means heat-sinking capability, reduce the equipment discharge of noise, do not increase the space that equipment is shared when mounted simultaneously.
Accompanying drawing explanation
Fig. 1 is the communication equipment overall structure schematic diagram that in the present invention, plug-in mounting is configured with multiple veneer;
Internal structure schematic diagram when Fig. 2 is the unassembled noise reduction water conservancy diversion module of the first embodiment in the present invention;
Internal structure schematic diagram when Fig. 3 is the unassembled noise reduction water conservancy diversion module of the second embodiment in the present invention;
Internal structure schematic diagram when Fig. 4 is the unassembled noise reduction water conservancy diversion module of the third embodiment in the present invention;
Fig. 5 is the schematic diagram of the first embodiment in the present invention;
Schematic diagram when Fig. 6 is Fig. 5 unassembled upper cover plate;
Fig. 7 is the structural representation of noise reduction water conservancy diversion module in Fig. 6;
Fig. 8 is the schematic diagram under the upper cover plate of the second embodiment in the present invention is in disassembled form;
Fig. 9 is the schematic diagram under the upper cover plate of the third embodiment of the present invention is in disassembled form;
Figure 10 is the schematic diagram of the 4th kind of embodiment in the present invention.
Embodiment
As shown in Figure 1; in a communication equipment, usually can configure the multiple different veneer be arranged in parallel, veneer is after being inserted into the sub-frame of communication equipment; by the several independently air channel of box body structure design forming of veneer corresponding up and down, in veneer, usually there is the ventilating air for cooling.
As shown in Figure 2, Figure 3 and Figure 4, correspond to the internal structure of the analog veneer 10 of high-power veneer, small-power veneer and unassembled components and parts respectively, the power consumption of these veneers has very large otherness.Because device density, heat dissipation element are less etc. in usual low-power consumption veneer, less to the flow resistance of air, cause a large amount of cooling-airs can be preferential by these veneers, then less by the cooling-air ratio of large power consumption veneer, cause communication equipment heat radiation uneven.To the heat radiation of veneer high-power in guarantee equipment, then also need to improve the total blast volume by communication equipment, and then cause the increase of equipment cooling energy consumption, noise of equipment discharge value.In order to meet the requirement of equipment Homogeneouslly-radiating and noise reduction simultaneously, below in conjunction with Figure of description, the present invention is described in detail.
Embodiment 1
As shown in Fig. 5, Fig. 6 and Fig. 7, provided by the invention a kind of based on heat radiation balance with noise reduction the high-power veneer be coupled, comprising inside can for the box body of air current flow, box body is removably connected in turn by front panel 1, the rear board 2 being configured with connector, upper cover plate 3 and base plate 4 or is welded to form, and the open at both ends of box body forms air inlet and air outlet respectively, pcb board 7 is provided with in box body, on pcb board, 7 are provided with electrical component, pcb board 7 is also provided with radiating module 6, and the center that radiating module 6 is preferably located at box body is beneficial to heat radiation.
Any medial surface of box body is arranged in the prominent part of noise reduction water conservancy diversion module 5 to tray interior, and the projected direction of noise reduction water conservancy diversion module 5 is perpendicular to the flow direction of air-flow in box body.According to actual conditions, in conjunction with the radiating requirements of the veneer of different power consumption and heat radiation, hydromechanical principle, can in box body the open area of the non-air flow direction of electrical component and radiating module 6 both sides, installation site and the planform of noise reduction flow-guiding structure 5 are specifically set.
As shown in Figure 7, in the present embodiment, the section of this noise reduction water conservancy diversion module 5 can be preferably designed for isosceles trapezoid, and the upper base of isosceles trapezoid is towards the inside of box body, and going to the bottom is connected with the inwall of box body, two waists of noise reduction water conservancy diversion module 5 form two guide faces 11 respectively, guide face 11 respectively towards and aim at air inlet and air outlet, this guide face 11 can reduce air flowing time flow resistance, increase systematic air flow, thus reduce rotating speed and the power of equipment fan, the noise of equipment is reduced from source.Further preferably, this noise reduction flow-guiding structure 5 is two and is arranged at the both sides of components and parts and radiating module 6 respectively.Like this, according to fluid mechanics principle, cooling-air is under the guide functions of guide face 11, can quickly and efficiently by the surface of radiating element 6 or the components and parts of correspondence, and the flow section of box body major part is intercepted by noise reduction water conservancy diversion module 5, cooling-air can pass along the surface of radiating element 6, thus reduces the reduction of the radiating efficiency that cooling-air bypass is brought widely, improves cooling effectiveness.In addition, the lateral surface of water conservancy diversion module 5 of making an uproar can also arrange projection 12, effectively strengthen noise absorbent area.
In the present embodiment; the external structure of noise reduction water conservancy diversion module 5 is preferably designed to layer protective layer 8; the outer surface of this protective layer 8 is evenly equipped with through hole 9; also preferably sound-absorbing material can be filled with in protective layer 8; in conjunction with actual conditions; the material of protective layer 8 can be panel beating, plastic cement or glass fabric; sound-absorbing material then can be loose structure and the polyurethane be interconnected between hole, melamine, foaming or agglomerated material; well, the fire-protection rating of sound-absorbing material is at least HBF for the resistance to elevated temperatures of this material and the acoustic absorptivity in whole frequency range.
When veneer is inserted in communication equipment; sound wave enters into the inside of noise reduction water conservancy diversion module 5 by the perforate 9 of protective layer 8; enter into again in the aperture of sound-absorbing material; air molecule in aperture and material grain are subject to exciting of sound wave and produce vibration; due to the viscosity between air molecule and the rubbing action between air and grain; make the Conversion of Energy of sound wave be heat energy and loss, the noise energy that communication equipment is produced is reduced, and then alleviates the discharge of noise of equipment to environment.By the present embodiment, the heat radiation achieving high-power veneer preferably balances with noise reduction and is coupled.
Embodiment 2
As shown in Figure 8, due to the present embodiment provide a kind of based on heat radiation balance with noise reduction the low-power veneer be coupled, therefore the difference of the present embodiment and embodiment 1 is mainly the small volume of the radiating element 6 of tray interior, the area of the flow section of cold-zone air is larger, flow resistance is less, cooling-air easily passes through, and causes cooling-air between low-power veneer with high-power veneer to distribute and does not mate.
In order to address this is that, the present embodiment comprises inside can for the box body of air current flow, box body is removably connected in turn by front panel 1, the rear board 2 being configured with connector, upper cover plate 3 and base plate 4 or is welded to form, and the open at both ends of box body forms air inlet and air outlet respectively, pcb board 7 is provided with in box body, on pcb board, 7 are provided with electrical component, and pcb board 7 is also provided with radiating module 6.
And the main distinction of the present embodiment and embodiment 1 is: preferably the width of noise reduction flow-guiding structure 5 is strengthened, that is noise reduction flow-guiding structure 5 extends into the open area of the non-air flow direction of the both sides of radiating element 6, the flow section area of cooling-air is reduced greatly, namely the flow resistance in the box body of low-power veneer is increased, reduce the bypass of cooling-air from low-power veneer, thus the flow resistance matching improved between different capacity veneer, cooling-air reasonable layout, makes more a high proportion of cooling-air by the power consuming devices in high-power veneer.
The concrete shape of the noise reduction flow-guiding structure 5 in the present embodiment, sets flexibly with the space of box body according to actual needs, as long as can reach the flow resistance matching between the different veneer of reasonable balance, its material and architectural characteristic can refer to embodiment 1 specific design.
In communication equipment application, after the various veneers being configured with management and service class, also have much vacant slot, for ensureing the heat radiation of these power veneers, vacant slot can configure analog veneer as shown in Figure 9 and Figure 10.Due in analog veneer without any device, it is negligible to the flow resistance of air for the power veneer of therefore opposing perimeter.For ensureing the versatility of multi-layer device and analog veneer, the ventilation-sectional area of General Requirements analog veneer is not less than 40%.But when analog veneer combinationally uses from different veneers, cooling-air can be aggravated and to distribute unmatched problem.
Embodiment 3
As shown in Figure 9, present embodiments provide a kind of based on heat radiation balance with noise reduction the analog veneer 10 be coupled, can be made up of for the box body of air current flow inside, the two ends of box body have opening and form air inlet and air outlet respectively, box body is furnished with the noise reduction water conservancy diversion module 5 of several side's bar shapeds, each noise reduction water conservancy diversion module 5 is uniform along the Width of box body, noise reduction water conservancy diversion module 5 will be divided into several gas channels 13 in box body, noise reduction water conservancy diversion module 5 along box body Width arrange time, due to the restriction of sound-absorbing material thickness, analog veneer 10 is to the low-frequency noise successful reducing equipment.
In analog veneer 10, sectional area shared by noise reduction water conservancy diversion module 5 is rationally arranged according to the radiating requirements of the flow resistance situation of periphery veneer and the top of phase cascade or bottom veneer.
The concrete shape of the noise reduction flow-guiding structure 5 in the present embodiment, sets flexibly with the space of box body according to actual needs, as long as can reach the flow resistance matching between the different veneer of reasonable balance, its material and architectural characteristic can refer to embodiment 1 specific design.
Embodiment 4
As shown in Figure 10, present embodiments provide another kind and balance with noise reduction the analog veneer 10 be coupled based on heat radiation, as different from Example 3, noise reduction water conservancy diversion module 5 is a plate body equal with box body width, noise reduction water conservancy diversion module 5 is arranged along the short transverse of box body and is posted by the bottom surface in box body, a gas channel 13 is formed between noise reduction water conservancy diversion module 5 and the inwall of box body, this design can obtain sound-absorbing material and the larger contact area of sound wave usually, being applicable to high frequency sound is main equipment, but be limited by the bulk restriction of analog veneer 10 short transverse, the thickness of noise reduction water conservancy diversion module 5 is relatively little, general at below 15mm, the reduction of equipment low-frequency noise is weakened.
In analog veneer 10, sectional area shared by noise reduction water conservancy diversion module 5 is rationally arranged according to the radiating requirements of the flow resistance situation of periphery veneer and the top of phase cascade or bottom veneer.
The concrete shape of the noise reduction flow-guiding structure 5 in the present embodiment, sets flexibly with the space of box body according to actual needs, as long as can reach the flow resistance matching between the different veneer of reasonable balance, its material and architectural characteristic can refer to embodiment 1 specific design.
In sum, can the radiating efficiency of effective lifting means by the present invention: the flow resistance characteristic difference can eliminated in communication equipment between different veneer makes more a high proportion of cooling-air by large power consumption veneer on the one hand; The cooling-air distribution can eliminating veneer inside is not on the other hand mated, and makes more a high proportion of cooling-air by the power consuming devices in veneer.
The present invention, by vertical from air flow direction in different communication equipment veneers, different noise reduction water conservancy diversion modules is set, the components and parts of the needs heat radiation that cooling-air is efficiently balancedly passed through in box body, noise reduction water conservancy diversion module eliminates consequent noise simultaneously, the heat-sinking capability solved existing for communication equipment promotes and reduces the contradiction of noise emission demand, while lifting means heat-sinking capability, reduce the equipment discharge of noise, do not increase the space that equipment is shared when mounted simultaneously.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (10)
1. one kind balances with noise reduction the veneer be coupled based on heat radiation, comprising inside can for the box body of air current flow, the open at both ends of described box body also forms air inlet and air outlet respectively, it is characterized in that, any medial surface of described box body is arranged in the prominent part of noise reduction water conservancy diversion module, the projected direction of described noise reduction water conservancy diversion module is perpendicular to the flow direction of air-flow in described box body.
2. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 1, it is characterized in that, the section of described noise reduction water conservancy diversion module is isosceles trapezoid, the upper base of described noise reduction water conservancy diversion module is towards the inside of described box body, going to the bottom of described noise reduction water conservancy diversion module is connected with the inwall of described box body, and two waists of described noise reduction water conservancy diversion module are respectively towards described air inlet and air outlet.
3. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 1, it is characterized in that, the outside of described noise reduction water conservancy diversion module is protective layer, and the outer surface of described protective layer is evenly equipped with through hole, is filled with sound-absorbing material in described protective layer.
4. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 1, it is characterized in that, described box body is removably connected in turn by front panel, the rear board being configured with connector, upper cover plate and base plate and forms.
5. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 1, it is characterized in that, the components and parts being provided with pcb board in described box body and being located on described pcb board, described noise reduction flow-guiding structure is two and is arranged at the both sides of described components and parts.
6. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 3; it is characterized in that; the material of described protective layer is panel beating, plastic cement or glass fabric; described sound-absorbing material is the polyurethane of loose structure, melamine, foaming or agglomerated material, and the fire-protection rating of described sound-absorbing material is more than HBF.
7. balance with noise reduction the veneer be coupled based on heat radiation as claimed in claim 5, it is characterized in that, described pcb board is also provided with radiating module, and described radiating module is located at the center of described box body.
8. one kind balances with noise reduction the analog veneer be coupled based on heat radiation, it is characterized in that, can be made up of for the box body of air current flow inside, the two ends of described box body have opening and form air inlet and air outlet respectively, it is characterized in that, be furnished with several noise reduction water conservancy diversion modules in described box body, described noise reduction water conservancy diversion module is divided into several gas channels by described box body.
9. balance with noise reduction the analog veneer be coupled based on heat radiation as claimed in claim 8, it is characterized in that, described noise reduction water conservancy diversion module is several bar shapes, each described noise reduction water conservancy diversion module is uniform along the depth direction of described box body, forms gas channel between described noise reduction water conservancy diversion module and the inwall of described box body.
10. balance with noise reduction the analog veneer be coupled based on heat radiation as claimed in claim 8, it is characterized in that, described noise reduction water conservancy diversion module is a plate body equal with described box body width, described noise reduction water conservancy diversion module is arranged along the short transverse of described box body and is posted by the bottom surface of described box body, forms a gas channel between described noise reduction water conservancy diversion module and the inwall of described box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009745.3A CN105555103B (en) | 2016-01-08 | 2016-01-08 | A kind of veneer and analog veneer coupled based on heat dissipation with noise reduction balance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009745.3A CN105555103B (en) | 2016-01-08 | 2016-01-08 | A kind of veneer and analog veneer coupled based on heat dissipation with noise reduction balance |
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| CN105555103A true CN105555103A (en) | 2016-05-04 |
| CN105555103B CN105555103B (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539221A (en) * | 2021-06-23 | 2021-10-22 | 南京立思辰智能设备有限公司 | LSU noise reduction and heat dissipation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201903825U (en) * | 2010-12-23 | 2011-07-20 | 北京中科大洋科技发展股份有限公司 | Integrated low-noise case of computer server |
| CN103021399A (en) * | 2012-11-21 | 2013-04-03 | 华为技术有限公司 | Sound-proof device and electronic equipment |
| CN105185369A (en) * | 2015-08-19 | 2015-12-23 | 哈尔滨城林科技股份有限公司 | Sound attenuating system for low-noise integrated equipment cabinet used for communication |
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2016
- 2016-01-08 CN CN201610009745.3A patent/CN105555103B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201903825U (en) * | 2010-12-23 | 2011-07-20 | 北京中科大洋科技发展股份有限公司 | Integrated low-noise case of computer server |
| CN103021399A (en) * | 2012-11-21 | 2013-04-03 | 华为技术有限公司 | Sound-proof device and electronic equipment |
| CN105185369A (en) * | 2015-08-19 | 2015-12-23 | 哈尔滨城林科技股份有限公司 | Sound attenuating system for low-noise integrated equipment cabinet used for communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539221A (en) * | 2021-06-23 | 2021-10-22 | 南京立思辰智能设备有限公司 | LSU noise reduction and heat dissipation method and device |
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