A server case shell with high stability

Abstract

The application discloses a server case shell with high stability, relates to the technical field of servers, and aims to solve the problems of weak protection ability, low heat dissipation efficiency, insufficient structural strength of a traditional single-layer case, and difficulty in adapting to the scene requirement of an industrial environment edge computing server, and comprises an outer shell body, an inner shell body, a supporting mechanism and a heat dissipation mechanism. The supporting mechanism has an end plate, a cover plate and vertically distributed first and second supporting members, can form a three-dimensional supporting frame, disperses external force and prevents impurities from entering; the heat dissipation mechanism forms high-efficiency air flow circulation through a heat conduction plate, an exhaust fan, a gas collecting cover and first and second air holes, and accelerates heat discharge; the base material of the inner shell body is an aluminum alloy which is passivated by phytic acid-aluminum salt and is closed by silane, the first composite coating on the inner surface has heat conduction and vibration resistance, and the second composite coating on the outer surface has heat dissipation and electromagnetic shielding. The application effectively adapts to the scene of the industrial environment edge computing server and maintains long-term stable operation of the server.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of servers, in particular to a server case shell with high stability. BACKGROUND

[0002] A server case is a shell specially designed to accommodate server hardware, and is usually larger and more robust than a general personal computer case, needs to accommodate more hardware components, and guarantees good heat dissipation, air flow and protection capability for hardware, especially in the industrial environment edge computing server scene (referring to the scene of deploying servers in industrial production sites to directly interface production equipment to undertake localized data processing and real-time control), which also needs to cope with complex working conditions such as high humidity, vibration and electromagnetic interference. However, the traditional server case adopts a single-layer case structure, which has many shortcomings:

[0003] On the one hand, the single-layer case has poor protection for the internal hardware, which is difficult to withstand the vibration during long-time operation of the server and the impact that may occur during the moving process, and the insufficient support strength easily leads to deformation of the case, and due to the lack of targeted corrosion and shielding design, the case is easily eroded by moisture in a high-humidity environment and cannot resist external electromagnetic interference, resulting in a decrease in the overall stability of the server;

[0004] On the other hand, the server generates a large amount of heat during operation, and the single-layer case only relies on its own heat dissipation, lacks efficient heat dissipation structure and heat conduction design, and the heat is difficult to quickly conduct out, which not only affects the performance and service life of the server, but also further aggravates the problem of insufficient support strength of the single-layer structure due to high temperature, and it is difficult to meet the needs of long-term stable operation of the industrial environment edge computing server. SUMMARY

[0005] The purpose of the present application is to provide a server case shell with high stability, which solves the problems of poor protection, weak heat dissipation and insufficient strength of the traditional single-layer case through the cooperation of the double-layer shell, the support mechanism and the heat dissipation mechanism, and the special treatment of the inner shell base material and the double-composite coating design, and adapts to the needs of the industrial environment edge computing server.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] A server case shell with high stability, comprising an outer shell, an inner shell arranged in the outer shell, a support mechanism arranged between the outer shell and the inner shell, and a heat dissipation mechanism arranged above the inner shell;

[0008] The support mechanism comprises an outer shell and an inner shell, an end plate welded at the end of the outer shell and the inner shell, a cover plate arranged at the side of the end plate, and a first support and a second support arranged between the outer shell and the inner shell; the side wall of the first support and the second support between the top wall of the outer shell and the top wall of the inner shell is provided with a plurality of first airflow through holes;

[0009] The heat dissipation mechanism comprises a plurality of heat-conducting plates welded on the upper surface of the inner shell, an exhaust fan installed at the top end of the heat-conducting plate, a gas collection cover welded on the inner top surface of the outer shell and covering the outside of the exhaust fan, and a first air-permeable hole and a second air-permeable hole opened on the top surface of the outer shell; the first air-permeable hole is located on the inner side of the gas collection cover, and the second air-permeable hole is located on the outer side of the gas collection cover.

[0010] The inner shell comprises a base material, a first composite coating arranged on the inner surface of the base material, and a second composite coating arranged on the outer surface of the base material.

[0011] The base material is an aluminum alloy plate, and the surface of the base material is sequentially subjected to phytic acid-aluminum salt composite passivation treatment and silane-nano silicon dioxide sealing agent spraying.

[0012] The first composite coating comprises epoxy-vegetable oil modified resin, inorganic nano heat-conducting filler, and heat-conducting polyurethane microspheres coated with an aluminum nitride layer on the surface.

[0013] The second composite coating comprises epoxy resin, nano aluminum oxide, aluminum nitride whiskers, and copper powder coated with an aluminum oxide layer on the surface.

[0014] Preferably, the heat-conducting plate is in an arc-shaped plate structure, and the heat-conducting plates are distributed at equal intervals.

[0015] Preferably, the second support is in a "U" shape structure, the first support is in a square ring structure, and the first support and the second support are both provided with grooves that are adapted to each other.

[0016] Preferably, the planes where the first support and the second support are located are perpendicular to each other.

[0017] Preferably, the thickness of the base material is 1.5-2.5 mm, the total thickness of the first composite coating is 100-200 μm, and the total thickness of the second composite coating is 40-80 μm.

[0018] Preferably, in the first composite coating, the epoxy-vegetable oil modified resin is epoxy-flaxseed oil modified resin, the mass ratio of flaxseed oil to epoxy resin is 1: (3-5), and the epoxy-vegetable oil modified resin is added with KH-550 coupling agent.

[0019] Preferably, in the first composite coating, the inorganic nano-thermal conductive filler is nano-aluminum nitride, the particle size of the nano-aluminum nitride is 40-100 nm, and the addition amount is 6-10 wt%; the thermal conductive polyurethane microspheres have a particle size of 5-15 mu m, and the addition amount is 8-10 wt%.

[0020] Preferably, in the second composite coating, the particle size of the nano-aluminum oxide is 0.8-3.5 mu m; the aspect ratio of the aluminum nitride whisker is (15-25):1; the particle size of the copper powder is 1.5-5.5 mu m, the mass ratio of the nano-aluminum oxide to the aluminum nitride whisker is (6-10):1, and the addition amount of the copper powder is 12-18 wt%.

[0021] Preferably, the surface of the second composite coating is further sprayed with a polyolefin oil-proof layer, and the spraying thickness of the polyolefin oil-proof layer is 8-20 mu m.

[0022] In the industrial environment edge computing server scene, there may be oil pollution in the workshop. By spraying a polyolefin oil-proof layer on the surface of the second composite coating, the oil pollution in the workshop can be effectively prevented from adhering to the surface of the coating, and the influence of the oil pollution on the heat conduction efficiency of the coating can be avoided.

[0023] Preferably, the bottom wall of the outer shell is provided with a plurality of third air permeable holes; the side walls of the first support and the second support between the bottom wall of the outer shell and the bottom wall of the inner shell are provided with a plurality of second airflow through holes; when the bottom wall of the outer shell is provided with the third air permeable holes, the epoxy resin in the second composite layer is a silicone modified epoxy resin.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The double-layer structure formed by the outer shell and the inner shell, in combination with the support mechanism and the heat dissipation mechanism, can realize the structural protection and efficient heat dissipation of the server in the industrial environment.

[0026] The support mechanism plays a role in stabilizing the structure: the end plates are respectively welded and fixed to the end portions of the outer shell and the inner shell, thereby building an end basic support frame for the double-layer shell; the cover plates are tightly connected to the end plates through flat head screws, which can not only block the same side openings of the double-layer shell to prevent dust and impurities in the industrial environment from entering the inner shell, but also further enhance the stability of the end structure. The first support and the second support can evenly disperse the vibration impact force generated during the server operation and the external force received during the handling process to different support members, thereby effectively preventing the deformation of the outer shell or the inner shell caused by excessive local stress; at the same time, the two supports can also provide stable support for the inner shell to prevent the inner shell from bending due to the weight of the internal hardware, thereby maintaining the stability and stability of the overall structure of the case.

[0027] By setting the heat dissipation mechanism composed of multiple heat-conducting plates, an exhaust fan, a gas collecting cover and first and second air permeable holes on the outer shell above the inner shell, the heat-conducting plates increase the contact area of the inner shell with air, the exhaust fan cooperates with the gas collecting cover to discharge hot air through the first air permeable hole, and external cold air enters the interlayer space through the second air permeable hole, so that the heat inside the case is efficiently discharged, and the performance and service life of the server are not affected by overheating.

[0028] 2. The inner shell can solve the core problems of the industrial environment edge computing server scene through the design of the base material and the double composite coating and the synergy of the components, and the specific solutions are as follows:

[0029] The inner shell base material is made of aluminum alloy plate, which can not only bear the weight of the internal hardware, but also resist impact during transportation and vibration generated by workshop equipment operation; at the same time, the surface of the base material is first subjected to phytic acid-aluminum salt composite passivation treatment to form a dense protective film to isolate external erosion, and then is sprayed with silane-nano silicon dioxide sealing agent to block the micropores of the passivation film, further improving the corrosion resistance, avoiding rusting of the base material caused by high humidity and dust impurities in the industrial environment, and prolonging the service life of the inner shell.

[0030] The first composite coating on the inner surface of the inner shell base material is based on epoxy-vegetable oil modified resin, which is closely combined with the surface of the base material to ensure that the first composite coating is not easy to fall off; nano aluminum nitride can quickly conduct the heat generated during hardware operation and timely transfer the heat to the base material; and the heat-conducting polyurethane microspheres coated with an aluminum nitride layer can absorb the vibration generated during hardware operation without affecting heat conduction, reducing the influence of vibration on hardware interfaces and components, so that the inner shell has high efficient heat conduction and vibration buffering capacity, and meets the dual requirements of heat and vibration during full load operation of the server.

[0031] In the second composite coating on the outer surface of the inner shell base material, epoxy resin is the bonding carrier, and nano aluminum oxide and aluminum nitride whiskers cooperate with each other to build a continuous heat conduction path in the second composite coating, accelerate the transfer of heat from the base material to the interlayer space between the outer shell and the inner shell, and help heat dissipation; copper powder blocks electromagnetic interference in the workshop environment, avoids interference signals affecting the calculation accuracy of the server, and realizes synchronous protection of heat dissipation and electromagnetic shielding.

[0032] In summary, the inner shell provided by the present application has a synergistic effect between the components, which can effectively adapt to the scene requirements of the industrial environment edge computing server and ensure long-term stable operation of the server. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0034] Figure 2 is a schematic diagram of the cross-sectional structure of the present application;

[0035] Figure 3 As Figure 1 Right side structural diagram;

[0036] Figure 4 As the structure diagram of each part in the application;

[0037] Figure 5 As the structure diagram of the heat-conducting plate, exhaust fan and gas collecting cover in the application;

[0038] Figure 6 As the structure diagram of the first support and the second support in the application.

[0039] Reference signs: 1, outer shell; 2, inner shell; 3, end plate; 4, cover plate; 5, flat head screw; 6, first support; 7, second support; 8, heat-conducting plate; 9, exhaust fan; 10, gas collecting cover; 11, first air-permeable hole; 12, second air-permeable hole. DETAILED DESCRIPTION

[0040] Example 1

[0041] A server case shell with high stability, as shown in the figure, comprises an outer shell 1 (304 stainless steel), an inner shell 2 arranged in the outer shell 1, a support mechanism arranged between the outer shell 1 and the inner shell 2, and a heat dissipation mechanism arranged above the inner shell 2; as shown in the figure, the outer shell 1 and the inner shell 2 are both square box-shaped structures and are open on the same side. Figures 1-6 Figures 1-4

[0042] As shown in the figure, the support mechanism comprises an end plate 3 welded at the end of the outer shell 1 and the inner shell 2, a cover plate 4 arranged on the side edge of the end plate 3 (blocking the opening of the outer shell 1 and the inner shell 2), and a first support 6 and a second support 7 arranged between the outer shell 1 and the inner shell 2 (the number of both in this embodiment is 2 respectively), the first support 6 and the second support 7 are fixed on the wall surface of the outer shell 1 and the inner shell 2 respectively by welding; as shown in the figure and Figures 1-4 Figure 3 Figure 4 As shown in the figure, screw holes are opened at the four corners of the end plate 3 (7075 aluminum alloy) and the cover plate 4, and flat head screws 5 are screwed in the screw holes. The side walls of the first support 6 (304 stainless steel) and the second support 7 (304 stainless steel) between the top wall of the outer shell 1 and the top wall of the inner shell 2 are provided with a plurality of first air flow holes (existing technology, not shown in the figure, circular holes, hole diameter 5mm). It can make the air flowing into the interlayer space (including the existing hot air and the air introduced from outside) circulate.

[0043] As shown in the figure, Figure 1 , Figure 2 and​​​​Figure 5 As shown, the heat dissipation mechanism includes a plurality of heat-conducting plates 8 (aluminum alloy, adjacent heat-conducting plates 8 are spaced 15 mm apart) welded on the upper surface of the inner housing 2, an exhaust fan 9 installed at the top end of the heat-conducting plate 8, a gas collection cover 10 welded on the inner top surface of the outer housing 1 and covering the outside of the exhaust fan 9, and a first air-permeable hole 11 (circular hole, hole diameter 6 mm) and a second air-permeable hole 12 (circular hole, hole diameter 5 mm) opened on the top surface of the outer housing 1; the first air-permeable hole 11 is located on the inner side of the gas collection cover 10, and the second air-permeable hole 12 is located on the outer side of the gas collection cover 10.

[0044] Further, as shown in Figure 5 The heat-conducting plate 8 is an arc-shaped plate structure, and the heat-conducting plates 8 are distributed at equal intervals.

[0045] Further, as shown in Figure 4 and Figure 5 The second support 7 is a "U" shaped structure, the first support 6 is a square ring structure, the first support 6 and the second support 7 are both provided with mutually adapted grooves; and the planes where the first support 6 and the second support 7 are located are perpendicular to each other, a three-dimensional support frame can be constructed between the outer housing 1 and the inner housing 2, the external force is dispersed to the supports in different directions, and local overloading is avoided to cause deformation of the box.

[0046] Working principle: when dissipating heat, the inner housing 2 quickly transfers the heat generated by the internal hardware operation to the outer surface, the plurality of arc-shaped heat-conducting plates 8 further accelerate the heat transfer of the inner housing 2 to the air in the interlayer space, so that the temperature of the interlayer air quickly rises. After the exhaust fan 9 is started, a negative pressure is formed inside the gas collection cover 10, the gas collection cover 10 concentrates the negative pressure suction force through wind gathering, and extracts the hot air in the interlayer space and the external air, which is finally discharged outside the case through the first air-permeable hole 11.

[0047] In summary, through the synergistic effect of the inner housing 2, the heat-conducting plates 8, the exhaust fan 9 and the gas collection cover 10, the heat generated by the hardware is efficiently transferred to the air and quickly discharged, the heat accumulation in the case is reduced, and the performance stability and service life of the server are effectively guaranteed.

[0048] Embodiment 2

[0049] On the basis of embodiment 1, the preparation method of the material of the inner housing 2 is further limited, which is as follows:

[0050] S1. Pretreatment of the substrate:

[0051] ①Prepare a phytic acid solution with a concentration of 5wt% and an aluminum sulfate solution with a concentration of 1.0wt%, mix the two solutions in a volume ratio of 4:1 and stir uniformly;

[0052] ②Substrate (7075 series aluminum alloy plate with a thickness of 2.0 mm) was completely immersed in the mixed solution, and soaked at room temperature for 15 minutes. After the substrate was taken out, the residual solution on the surface was washed with deionized water, and then the substrate was placed in an oven at 50°C for drying for 40 minutes to obtain a substrate with a passivation film formed on the surface.

[0053] ③A silane-nano-silica sealing agent dispersion liquid was prepared by using γ-aminopropyl triethoxysilane as a base material, adding 3wt% of nano-silica with a particle size of 20 nm, and uniformly dispersing the mixture by using a high-speed dispersion machine. The sealing agent was uniformly sprayed on the surface of the passivation film of the substrate by using an air spray gun (nozzle diameter 1.5 mm, spraying pressure 0.3 MPa), and the spraying thickness was controlled to be 4 μm. After the spraying was completed, the substrate was placed in an oven at 80°C for curing for 1.5 hours, and the substrate was prepared after cooling.

[0054] S2. Preparation of the first composite coating (not shown in the figure):

[0055] ①Coating slurry preparation: linseed oil and bisphenol F type epoxy resin were weighed according to a mass ratio of 1:4, mixed, and then 0.5wt% of KH-550 coupling agent was added. The mixture was stirred in a water bath at 60°C for 40 minutes (rotating speed 800 r / min). Then, 8wt% of nano-aluminum nitride with a particle size of 60 nm was added to the resin system, and the stirring was continued for 60 minutes. Then, 9wt% of polyurethane microspheres coated with an aluminum nitride layer and having a particle size of 10 μm were added, and the mixture was ball milled by using a ball mill (ball-to-material ratio 5:1, rotating speed 300 r / min) for 2 hours to prepare a uniform first composite coating slurry.

[0056] ②The first composite coating slurry was coated on the inner surface of the substrate, and the wet film thickness was controlled to be 150 μm (total thickness after curing about 120 μm). After the coating was completed, the coated substrate was placed in a 75°C air-blowing oven for constant temperature curing for 4.5 hours, and then taken out and naturally cooled to room temperature to form the first composite coating.

[0057] S3. Preparation of the second composite coating (not shown in the figure):

[0058] ①Coating slurry preparation: bisphenol F type epoxy resin was selected as a base material, and nano-aluminum oxide with a particle size of 2.0 μm and aluminum nitride whiskers with an aspect ratio of 20:1 (mass ratio of the two 8:1) were added to the base material. Then, 15wt% of copper powder coated with an aluminum oxide layer and having a particle size of 3.0 μm was added. The mixture was placed in a planetary mixer and stirred at a rotating speed of 1500 r / min for 120 minutes to ensure that the fillers were uniformly dispersed, and a second composite coating slurry was prepared.

[0059] ②Coating and curing: the second composite coating slurry is coated on the outer surface of the substrate by electrostatic spraying process (spraying voltage 60 kV, spraying distance 20 cm), and the wet film thickness is controlled to be 60 μm (total thickness after curing is about 50 μm), and after curing, the substrate is taken out and naturally cooled to room temperature, and the preparation of the second composite coating is completed, and at this time, the inner shell 2 material is prepared.

[0060] It is worth noting that: the third air vent is not provided in this embodiment, and the epoxy resin in the second composite layer is bisphenol F type epoxy resin. This type of epoxy resin can meet the basic bonding, heat conduction and shielding performance requirements in the scene of long-term scouring of airflow without bottom.

[0061] In the above-mentioned inner shell 2, the preparation method of the heat-conducting polyurethane microspheres coated with an aluminum nitride layer is as follows:

[0062] ①100 parts of polyhexanediol adipate diol were added to a four-necked flask, heated to 60°C, and then 30 parts of toluene diisocyanate were added. After stirring, 5 parts of dimethylol propionic acid and 80 parts of N,N-dimethylformamide were added, and the temperature was raised to 70°C for 1.5 hours. Then the temperature was lowered to 40°C, 4 parts of triethylamine was added and stirred for 30 minutes, then the product was slowly dropped into 200 parts of deionized water containing 3 parts of sodium dodecyl sulfate, and at the same time, high-speed stirring was started at a speed of 2000 r / min, and emulsification was carried out for 30 minutes to form a stable polyurethane emulsion; 15 parts of nano-aluminum nitride and 2 parts of silane coupling agent KH-550 were mixed and stirred at 50°C for 60 minutes, then the obtained product was added to the polyurethane emulsion, uniformly dispersed, and then the temperature was raised to 50°C for 2 hours of stirring and insulation, so as to promote the polyurethane particles in the emulsion to solidify and form, then centrifugal separation was carried out, the microspheres were collected and washed, and finally the microspheres were placed in a 60°C air oven for drying for 4 hours, thereby obtaining heat-conducting polyurethane microspheres with a particle size of 5-15 μm.

[0063] Aluminum nitride powder (particle size 50 nm) and deionized water were weighed according to a mass ratio of 1:5, 0.3wt% of polyvinylpyrrolidone was added, and after being fully dispersed, an aluminum nitride dispersion liquid was prepared; then 0.5wt% of silane coupling agent KH-560 was added dropwise to the dispersion liquid, and stirring was carried out at 50°C water bath for 60 minutes, thereby obtaining an aluminum nitride coating liquid.

[0064] ②The heat-conducting polyurethane microspheres (particle size 10 μm) are added into the aluminum nitride coating solution, the mass ratio of the microspheres to the coating solution is 1:8, and the mixture is stirred at 30°C for 90 minutes (rotation speed 200 r / min); then the microspheres are separated by filtration, and are placed in an oven at 75°C for 2.5 hours to solidify, so as to form an aluminum nitride coating layer, and finally the heat-conducting polyurethane microspheres coated with an aluminum nitride layer are obtained.

[0065] The method for preparing the copper powder coated with an aluminum oxide layer is as follows:

[0066] An aluminum sulfate solution is prepared at a concentration of 0.1 mol / L, 0.2 wt% of trisodium citrate is added into the solution, and the solution is stirred until completely dissolved; then ammonia water is added dropwise to adjust the pH of the solution to 8.0, so as to form an aluminum hydroxide precursor solution.

[0067] Then, the copper powder (particle size 3.0 μm) is added into the aluminum hydroxide precursor solution, the mass ratio of the copper powder to the solution is 1:10, and the mixture is stirred in a water bath at 60°C for 180 minutes; then the copper powder is separated by filtration, is dried in an oven at 100°C for 3 hours, and is calcined in a muffle furnace at 450°C for 2 hours, so as to obtain the copper powder coated with an aluminum oxide layer.

[0068] Example 3

[0069] In Example 2, the heat dissipation mechanism only relies on the second air inlet hole 12 on the top surface of the outer shell 1 to introduce external air, which can form air circulation in cooperation with the first air inlet hole 11 and the exhaust fan 9. However, in the high-load operation scenario of the edge computing server in the industrial environment, the heat generated by the hardware in the interlayer space continuously accumulates. It is difficult to quickly fill the entire interlayer space and fully contact the outer surface of the inner shell 2 and the heat-conducting plate 8 through the single air inlet path on the top. As a result, the exhaust efficiency of the hot air in the interlayer is limited, and part of the heat is easily accumulated in the lower part of the interlayer, which cannot be extracted and discharged by the exhaust fan 9 in time. The overall heat dissipation efficiency is slow, and it is difficult to adapt to the complex working conditions of high temperature and high heat in the industrial environment.

[0070] Therefore, in this embodiment, the heat dissipation structure and the coating of the inner shell 2 are further optimized based on Example 2, as follows:

[0071] The bottom wall of the outer shell 1 is provided with a plurality of third air inlet holes (prior art, not shown in the figure, circular holes, hole diameter 6 mm); the side walls of the first support 6 and the second support 7 between the bottom wall of the outer shell 1 and the bottom wall of the inner shell 2 are provided with a plurality of second air flow holes (prior art, not shown in the figure, circular holes, hole diameter 5 mm); when the bottom wall of the outer shell 1 is provided with the third air inlet holes, the epoxy resin in the second composite layer is a silicone-modified epoxy resin.

[0072] Working principle: After the exhaust fan 9 is started, external air enters through the third air-permeable hole in the bottom wall of the outer shell 1, then diffuses to the entire interlayer through the second airflow passage, and after fully absorbing the heat transferred by the inner shell 2, the hot air flows upward and is discharged through the first air-permeable hole 11, while the second air-permeable hole 12 is blocked to ensure that cold air enters from the bottom first, solving the problem of heat accumulation in the lower part of the interlayer; for long-term airflow scouring at the bottom, the second composite coating uses silicone-modified epoxy resin, which has high wear resistance and temperature resistance due to the silicon-oxygen bond, reducing coating wear and aging caused by airflow scouring, ensuring stable coating heat conduction and shielding function, and adapting to industrial high-load working conditions.

[0073] The preparation method of the silicone-modified epoxy resin is as follows:

[0074] ① 100g of bisphenol F type epoxy resin is added to a four-necked flask, heated to melt the resin, then 30g of anhydrous ethanol is slowly added, and stirring is continued for 15 minutes to form a resin solution;

[0075] ② Take 12g of KH-560 and 5g of deionized water and add them to a beaker, place the beaker in a 50℃ water bath, start magnetic stirring (speed 200r / min), and keep stirring for 35 minutes to make the silane coupling agent fully hydrolyze to form an intermediate containing silicon hydroxyl groups; then slowly drop the hydrolyzed intermediate into the above four-necked flask, control the dropping rate to complete the dropping process within 40 minutes; after dropping is completed, 0.8g of dimethylbenzylamine catalyst is added to the flask, the temperature of the system is raised to 85℃, and stirring is continued for 2.5 hours to form a silicone-modified epoxy resin prepolymer, then the temperature of the system is lowered to 50℃, and stirring is continued at a speed of 300r / min for 30 minutes to eliminate small bubbles, and finally the silicone-modified epoxy resin is obtained.

[0076] In addition, it is worth noting that in this embodiment, the second air-permeable hole 12 needs to be completely blocked (such as using a cover plate 4 threaded at the top end of the outer shell 1), to ensure that only cold air from the bottom enters through the third air-permeable hole, forming a stable air flow circulation of bottom air intake → interlayer diffusion → top air exhaust, avoiding the influence of part of the cold air entering from the top on the interlayer heat dissipation efficiency.

[0077] In addition, as shown in Figure 6 , at this time the first support 6 and the second support 7 form a closed mouth-shaped shape at the bottom end, and the vertical upward projection of the third air-permeable hole is both inside and outside the mouth-shaped area.

[0078] At this time, a cover plate 4 is provided at the top end of the second air-permeable hole 12.

[0079] In this embodiment, to ensure that the third air vent can stably introduce sufficient external air, at least 5 cm of height of the air supply space is reserved below the third air vent of the bottom wall of the outer shell 1, to ensure that air can smoothly pass through the third air vent into the interlayer space between the outer shell 1 and the inner shell 2, and to provide sufficient air source for heat dissipation airflow circulation.

[0080] Comparative Example 1

[0081] Compared with Example 2, the heat-conductive polyurethane microspheres coated with an aluminum nitride layer are replaced with heat-conductive polyurethane microspheres, and the copper powder coated with an aluminum oxide layer is replaced with copper powder, and the remaining steps and parameters remain unchanged.

[0082] Comparative Example 2

[0083] Compared with Example 2, the substrate surface is not subjected to the phytic acid-aluminum salt composite passivation treatment and the silane-nano silicon dioxide sealant spraying treatment in sequence.

[0084] The remaining steps are the same as those in Example 2.

[0085] Comparative Example 3

[0086] Compared with Example 2, the epoxy-vegetable oil modified resin in the first composite coating is replaced with bisphenol F type epoxy resin.

[0087] The remaining steps are the same as those in Example 2.

[0088] Comparative Example 4

[0089] Compared with Example 3, the silicone modified epoxy resin in the second composite layer is replaced with bisphenol F type epoxy resin.

[0090] The remaining steps are the same as those in Example 3.

[0091] Experimental Example

[0092] To verify the core performance of the server case shell in Examples 2-3 and Comparative Examples 1-4 in the industrial environment edge computing scene, the server case shells in Examples 2, 3, Comparative Examples 1, 2, 3, and 4 are used as experimental samples (3 parallel samples are prepared for each group of samples to ensure data repeatability), and the following experiments are performed.

[0093] 1. Corrosion resistance detection (for the inner shell 2 substrate and coating)

[0094] Detection method: neutral salt spray test (5% NaCl solution, pH 6.5-7.2, temperature 35°C) is performed on the surface of the inner shell 2 of each group of samples, whether rust or coating peeling occurs on the surface of the inner shell 2 is observed, and the time when rust or coating peeling first occurs is recorded.

[0095] 2. Thermal conductivity detection (for inner shell 2)

[0096] Detection method: Take the inner shell 2 sample (size 30mm x 30mm) of each group, measure the thermal conductivity at room temperature 25°C.

[0097] 3. Electromagnetic shielding effectiveness detection (for inner shell 2)

[0098] Detection method: Using the coaxial transmission line method, measure the electromagnetic shielding effectiveness of each group of sample inner shell 2 in the frequency range of 30MHz-1GHz.

[0099] 4. Combined detection of heat dissipation efficiency and airflow effect on the second composite coating.

[0100] Detection method:

[0101] Experimental environment simulates industrial edge computing scene: constant temperature 40°C, no external forced airflow interference, each group of samples is placed with the same configuration server (CPU 150W, GPU 200W), the server is preset to full load operation mode (CPU usage rate 100%, GPU usage rate 95% is locked through professional software, simulating data processing peak working condition in industrial scene);

[0102] Case pretreatment: reserve a 8mm diameter temperature measurement window at the center of the CPU cooling fin on the outer shell, and install a calcium fluoride crystal sheet;

[0103] Heat dissipation and temperature monitoring: turn on the exhaust fan 9 (parameters: axial flow fan matching the size of the air collector 10, rated voltage 220V, rated power 30W, running speed 2800r / min, air volume 120m³ / h, air pressure 80Pa), form the air circulation of third air hole inlet wind → interlayer space → exhaust fan 9 → first air hole 11 exhaust air;

[0104] Initial stable temperature acquisition: after the experiment starts, every 15 minutes, use an infrared thermometer (D:S=50:1, temperature measurement accuracy ±0.5°C) to aim at the center of the CPU cooling fin through the window, and record the temperature; when the difference of continuous 3 times measurement is ≤1°C, it is determined as the initial stable maximum temperature;

[0105] Long-term stability monitoring: every 24 hours, measure the CPU temperature under the same environmental conditions (constant temperature 40°C, fan continuous running) at the same time period (such as 8:00) every day, and calculate the difference with the "initial stable maximum temperature";

[0106] Coating performance detection: after running for 1000 hours, the server and the fan are turned off, and the standby box is cooled to room temperature. Observe whether the second composite coating surface (the area near the third air hole at the bottom) is worn, peeled, or powdered. Use a 1mm grid knife to draw a grid on the coating surface (grid spacing 1mm, draw through the coating to the substrate). Use 3M tape to test and observe the coating peeling, and determine the adhesion level.

[0107] 5. Structural stability detection.

[0108] Detection method: Perform a sinusoidal vibration test on each group of cabinet samples (frequency 10-200Hz, acceleration 50m / s², 2 hours of vibration per axis). Before and after vibration, measure the dimensions of the key parts of the outer shell 1 and the inner shell 2 (the length of the top surface of the outer shell 1, the length of the bottom surface of the inner shell 2, and the height of the support) using a laser thickness gauge (measure each part 3 times and take the average). Calculate the size deviation value (deformation = size after vibration - size before vibration, the smaller the absolute value, the smaller the deformation). At the same time, measure the deflection of the middle part of the inner shell 2 using a dial gauge (after applying a pressure of 50N, the maximum sag of the inner shell 2).

[0109] The experimental results are shown in Table 1.

[0110] Table 1:

[0111]

[0112] It is worth noting that in Table 1, " / " means that the relevant experiment has not been performed.

[0113] From Table 1, we can see that:

[0114] In Example 2, the substrate is first treated with a phytic acid-aluminum salt composite passivation process to form a dense passivation film, which isolates moisture and impurities in the industrial environment. Then, a silane-nano silicon dioxide sealant is sprayed to block the pores of the passivation film, further strengthening the corrosion resistance to resist rust in high humidity environments. The first composite coating uses epoxy-flaxseed oil modified resin as the base material, which tightly bonds with the substrate. The added nano aluminum nitride can create a continuous basic heat conduction path, and the heat-conductive polyurethane microspheres with an aluminum nitride layer on the surface can absorb vibrations without disrupting the heat conduction continuity, providing both efficient heat conduction and vibration damping performance. The second composite coating uses epoxy resin as the carrier, and the nano aluminum oxide and aluminum nitride whiskers form a continuous heat conduction path, accelerating the transfer of substrate heat to the interlayer space to assist in heat dissipation. The copper powder with an aluminum oxide layer on the surface blocks external electromagnetic interference. At the same time, the first support 6 and the second support 7 in the support mechanism are perpendicular to each other and have adaptive slots, which can create a three-dimensional support frame to disperse vibration impact force and external force, maintain the overall structural stability of the shell, and prevent deformation.

[0115] Example 3: Based on Example 2, a third air vent is added to the bottom wall of the outer shell 1, and a second air flow hole is provided in the side wall of the support, while the second air vent 12 is blocked, so that the exhaust fan 9 forms a high-efficiency air flow circulation of bottom air inlet - interlayer diffusion - top air exhaust, reduces the heat accumulation in the interlayer space, and has better heat dissipation efficiency, which can quickly export a large amount of heat generated by hardware operation; the second composite coating uses silicone modified epoxy resin, and the silicon-oxygen bond improves the wear resistance and temperature resistance of the coating, so that it has stronger anti-airflow erosion performance, and the second composite coating is not easy to wear and peel off during long-term use; the components of the inner shell 2 and the optimized heat dissipation structure synergistically act, the corrosion resistance of the substrate provides a stable adhesion basis for the coating, and the heat conduction and shielding functions of the coating are suitable for industrial high-load scenes.

[0116] Comparative Example 1: The absence of an aluminum nitride coating layer on the thermally conductive elastic microspheres results in thermal interface resistance between the nano-aluminum nitride, and the copper powder lacks an aluminum oxide coating layer, which is easily oxidized to form an insulating layer, resulting in a significant decrease in thermal conductivity and electromagnetic shielding performance, which cannot efficiently transfer heat and block electromagnetic interference; at the same time, the decrease in thermal conductivity leads to a blockage of heat discharge in the interlayer space, further affecting the overall heat dissipation effect.

[0117] Comparative Example 2: The substrate lacks a dense passivation film and a sealing layer, on the one hand, the corrosion resistance of the substrate decreases, and moisture and impurities in the industrial environment easily penetrate through the small pores of the coating to the surface of the substrate, causing the substrate to rust after long-term operation; on the other hand, the untreated substrate surface has insufficient activity, and the adhesion between the first composite coating (epoxy - linseed oil modified resin system) and the second composite coating (epoxy resin system) is significantly weakened, which is prone to coating delamination and peeling.

[0118] Comparative Example 3: The ordinary epoxy resin has poor elasticity and cannot absorb the vibration energy generated by the server operation, resulting in a decrease in vibration damping performance.

[0119] Comparative Example 4: The ordinary epoxy resin has insufficient wear resistance and temperature resistance, and the coating is prone to wear and peeling under the long-term scouring of the bottom air flow, which reduces the integrity and performance stability of the coating, making it difficult to adapt to long-term operation conditions in industrial environments.

[0120] In summary: Example 2 can meet the basic scene of conventional load and medium environmental complexity; Example 3 solves the problems of high-load heat accumulation and long-term airflow scouring, and is suitable for industrial complex working conditions; and each comparative example cannot meet the needs of industrial edge computing scenes due to the lack of key technical features.

Claims

1. A server chassis housing with high stability, characterized in that: The application relates to a server case shell. The support mechanism comprises end plates (3) welded at the ends of the outer shell (1) and the inner shell (2), cover plates (4) arranged at the sides of the end plates (3), and first support pieces (6) and second support pieces (7) arranged between the outer shell (1) and the inner shell (2); the side walls of the first support pieces (6) and the second support pieces (7) between the top wall of the outer shell (1) and the top wall of the inner shell (2) are each provided with a plurality of first airflow through holes. The heat dissipation mechanism comprises a plurality of heat conduction plates (8) welded on the upper surface of the inner shell (2), exhaust fans (9) installed at the top ends of the heat conduction plates (8), a gas collecting cover (10) welded on the inner top surface of the outer shell (1) and covering the outside of the exhaust fans (9), and first air permeation holes (11) and second air permeation holes (12) formed in the top surface of the outer shell (1); the first air permeation holes (11) are located on the inner side of the gas collecting cover (10), and the second air permeation holes (12) are located on the outer side of the gas collecting cover (10). The inner shell (2) comprises a base material, a first composite coating arranged on the inner surface of the base material, and a second composite coating arranged on the outer surface of the base material. The base material is an aluminum alloy plate, and the surface of the base material is sequentially subjected to phytic acid-aluminum salt composite passivation treatment and silane-nano silicon dioxide sealing agent spraying. The first composite coating comprises epoxy-vegetable oil modified resin, inorganic nano heat conductive filler, and heat conductive polyurethane microspheres coated with an aluminum nitride layer. The second composite coating comprises epoxy resin, nano aluminum oxide, aluminum nitride whiskers, and copper powder coated with an aluminum oxide layer. The server case shell is an industrial environment edge computing server shell.

2. The server case shell with high stability according to claim 1, characterized in that: The heat conduction plates (8) are arc-shaped plate structures and are distributed at equal intervals.

3. The server case shell with high stability of claim 1, wherein: The second support pieces (7) are U-shaped structures, the first support pieces (6) are square ring structures, and the first support pieces (6) and the second support pieces (7) are each provided with a groove matched with each other.

4. The server case housing with high stability of claim 3, wherein: The planes where the first support pieces (6) and the second support pieces (7) are located are perpendicular to each other.

5. The server case shell with high stability of claim 1, wherein: The thickness of the base material is 1.5-2.5 mm, the thickness of the first composite coating is 100-200 mu m, and the thickness of the second composite coating is 40-80 mu m. In the first composite coating, the epoxy-vegetable oil modified resin is epoxy-flaxseed oil modified resin, the mass ratio of flaxseed oil to epoxy resin is 1:(3-5), and the epoxy-vegetable oil modified resin is added with a KH-550 coupling agent.

6. The server case housing with high stability of claim 1, wherein: In the first composite coating, the inorganic nano heat conductive filler is nano aluminum nitride, the particle size of the nano aluminum nitride is 40-100 nm, the addition amount is 6-10 wt%, the particle size of the heat conductive polyurethane microspheres is 5-15 mu m, and the addition amount is 8-10 wt%.

7. The server case housing with high stability of claim 1, wherein: ​ 8. The server case housing with high stability of claim 1, wherein: The nano-aluminum oxide particle size in the second composite coating is 0.8-3.5 mu m; the length-diameter ratio of the aluminum nitride whisker is (15-25):1; the copper powder particle size is 1.5-5.5 mu m; the mass ratio of the nano-aluminum oxide and the aluminum nitride whisker is (6-10):1; and the copper powder addition amount is 12-18 wt%.

9. The server case housing with high stability of claim 1, wherein: The surface of the second composite coating is further sprayed with a polyolefin oil-proof layer, and the spraying thickness of the polyolefin oil-proof layer is 8-20 mu m.

10. The server case housing with high stability of claim 3, wherein: The bottom wall of the outer shell (1) is provided with a plurality of third air permeable holes; the side walls of the first support (6) and the second support (7) between the bottom wall of the outer shell (1) and the bottom wall of the inner shell (2) are provided with a plurality of second air flow through holes; when the bottom wall of the outer shell (1) is provided with the third air permeable holes, the epoxy resin in the second composite layer is a silicone modified epoxy resin.

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