Vibration reduction case of multi-layer composite gradient sandwich structure

Abstract

The invention discloses a vibration reduction case of a multi-layer composite gradient interlayer structure. The vibration reduction case comprises an upper cover plate, a rear panel, a first outer plate, a second outer plate, a front panel, a bottom plate and an interlayer assembly. The outermost layer plate of the case is made of high-strength aluminum alloy subjected to anodic oxidation treatment, so that the wear resistance and the corrosion resistance are enhanced. And the middle layer is a metal rubber interlayer made of metal wires with different wire diameters according to a specific proportion and a specific weaving mode. The wire diameter of one side, close to the outer layer, of the metal rubber interlayer is small, and the metal rubber interlayer is used for more sensitively capturing and buffering high-frequency tiny vibration. The diameter of the wire close to the inner layer is larger, and the wire focuses on coping with low-frequency large-amplitude vibration. The inner-layer plate of the case is made of high-purity copper materials, heat generated by hardware in the case is conducted to the metal rubber interlayer by means of the heat conduction performance of the inner-layer plate, then the metal rubber interlayer evenly disperses the heat and transmits the heat to the outer-layer aluminum alloy plate, and the effects of efficient heat dissipation and omni-directional vibration reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial chassis, and in particular relates to a vibration-damping chassis with a multi-layer composite gradient sandwich structure. Background Art

[0002] With the rapid development of aerospace, precision instruments, high-end equipment and other fields, electronic equipment chassis are facing increasingly harsh vibration environment challenges. According to statistics, the failure of electronic components caused by vibration under complex working conditions accounts for as much as 45%. Although traditional metal chassis have excellent structural strength, their inherent high stiffness characteristics result in a vibration transmission rate of more than 70%, which makes it difficult to meet the stringent requirements of precision equipment for micro-vibration environments. Although existing rubber vibration isolation devices can achieve a vibration attenuation of 20-40dB, their resistance to high and low temperatures (-60 to 200°C) and insufficient anti-aging performance have not been overcome, and their performance degradation rate is high in the vibration radiation environment of spacecraft.

[0003] Superelastic Metal Rubber (MR) is a new type of porous mesh metal elastomer. It uses a stainless steel wire spiral winding and compression molding process to create a three-dimensional interpenetrating network structure. It combines the weather resistance of a metal phase with the superelasticity of rubber (elastic modulus adjustable from 0.1 to 5 MPa), achieving a compression rebound rate exceeding 98%. Research has shown that MR can produce a unique "rigid-flexible coupling" effect in broadband vibration environments, achieving a vibration energy conversion rate of up to 60% through dry friction energy dissipation between the metal wires. However, MR is still not currently used as a vibration isolation layer in computer chassis.

[0004] The core problem facing current chassis vibration reduction design is that traditional rubber is difficult to adapt to complex working conditions with wide bandwidth and multi-directional random coupling. It is urgent to break through the technical bottlenecks of existing vibration reduction chassis in terms of vibration spectrum adaptability, environmental adaptability and service reliability through material-structure collaborative innovation.

[0005] Patent publication number CN107484379A discloses a general structure and method for improving vibration damping. The structure includes a circuit board disposed within a chassis, which is mounted on a circuit board mounting bracket via mounting posts. A vibration damping assembly is also disposed within the bracket. The vibration damper described in the patent generally employs a silicone damper, metal rubber, or a vibration-damping pad, which is installed within the general structure.

[0006] The patent document with announcement number CN114760807A discloses a server chassis and heat dissipation method with an integrated ultrasonic atomization phase change liquid cooling module, including a chassis body and an upper cover plate. The components are fixed and sealed by sealing gaskets and screws; the sealing gasket material can be silicone, polytetrafluoroethylene, nitrile rubber, metal rubber, etc.

[0007] The above patents all use metal rubber for shock absorption, but do not solve the technical problem of improving the adaptability of the vibration spectrum of metal rubber, and do not involve settings for enhancing the heat dissipation effect through metal rubber. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a vibration-damping chassis with a multi-layer composite gradient sandwich structure.

[0009] The present invention is achieved through the following technical solutions.

[0010] The present invention provides a vibration-damping chassis with a multi-layer composite gradient sandwich structure, comprising an upper cover plate, a rear panel, a first outer panel, a second outer panel, a front panel, a bottom plate and a sandwich assembly, wherein the upper cover plate is respectively connected to the top of the rear panel, the first outer panel, the second outer panel, the front panel and the sandwich assembly, and the bottom plate is respectively connected to the bottom of the rear panel, the first outer panel, the second outer panel, the front panel and the sandwich assembly, the first outer panel and the second outer panel are arranged between the rear panel and the front panel, and the sandwich assembly is respectively arranged on the first outer panel and the second outer panel.

[0011] Preferably, the sandwich assembly includes a first inner panel, a first interlayer, a second interlayer and a second inner panel, the first inner panel is connected to the first outer panel, the first interlayer is arranged between the first inner panel and the first outer panel, the second inner panel is connected to the second outer panel, and the second interlayer is arranged between the second inner panel and the second outer panel.

[0012] Preferably, the first interlayer and the second interlayer are made of filamentous material, and the diameter of the filamentous material increases sequentially from one side of the first interlayer and the second interlayer to the other side of the first interlayer and the second interlayer.

[0013] Preferably, the first interlayer and the second interlayer are made of metal wire material, and the first inner plate and the second inner plate are made of copper.

[0014] Preferably, the density of the first interlayer and the second interlayer is 4-2 g / cm from the inside to the outside. 3 The range gradually decreases.

[0015] Preferably, the first interlayer and the second interlayer both include a clamping portion and a protruding portion, both sides of the protruding portion are respectively connected to the clamping portion, and a clamping groove is provided on one side of the protruding portion.

[0016] Preferably, the cross section of the protruding portion is arc-shaped, and the cross section of the clamping portion is rectangular.

[0017] Preferably, a plurality of limiting rods are provided on the first inner plate and the second inner plate, and a weight-reducing groove is provided on the first inner plate and the second inner plate respectively.

[0018] Preferably, the first outer plate and the second outer plate are respectively provided with a plurality of grooves.

[0019] Preferably, a handle is provided on the front panel.

[0020] The beneficial effects of the present invention are:

[0021] The present invention embeds multiple metal rubber interlayers on the side panels of the chassis, and the outermost plate of the chassis is made of high-strength aluminum alloy that has been anodized to enhance wear resistance and corrosion resistance. The middle layer is a metal rubber interlayer made of metal wires of different wire diameters according to a specific proportion and weaving method. The wire diameter of the metal rubber interlayer close to the outer layer is thinner, which is used to more sensitively capture and buffer high-frequency micro-vibrations; the wire diameter close to the inner layer is slightly thicker, focusing on dealing with low-frequency and larger-amplitude vibrations. The inner plate of the chassis is made of high-purity copper material, and its thermal conductivity is used to conduct the heat generated by the hardware inside the chassis to the metal rubber interlayer, and then the metal rubber interlayer evenly disperses the heat and transfers it to the outer aluminum alloy plate, thereby improving the adaptability of the vibration spectrum and achieving efficient heat dissipation and all-round vibration reduction. The chassis of the present invention is suitable for aerospace, precision instruments, high-end equipment and other fields, providing a stable operating environment for electronic equipment and ensuring the reliability and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of the present invention;

[0023] Figure 2 It is a front view of the present invention;

[0024] Figure 3 It is a left side view of the present invention;

[0025] Figure 4 It is a schematic diagram of the AA cross-sectional structure of the present invention;

[0026] Figure 5 It is a schematic structural diagram of region A of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the second outer plate of the present invention;

[0028] Figure 7 is a schematic structural diagram of the first inner plate of the present invention;

[0029] Figure 8 is a schematic structural diagram of the second inner plate of the present invention;

[0030] Figure 9 is a front view of the first interlayer of the present invention;

[0031] Figure 10 is a top view of the first interlayer of the present invention;

[0032] Figure 11 is a side view of the first interlayer of the present invention;

[0033] In the figure: 1-upper cover, 2-back panel, 3-first inner panel, 4-first interlayer, 5-first outer panel, 6-second outer panel, 7-second interlayer, 8-second inner panel, 9-front panel, 11-bottom plate, 13-groove, 14-limiting rod, 15-weight reduction groove, 101-clamping portion, 102-protruding portion, 103-clamping slot. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0035] Example:

[0036] like Figures 1 to 11 As shown, a vibration-damping chassis with a multi-layer composite gradient sandwich structure includes an upper cover plate 1, a rear panel 2, a first outer panel 5, a second outer panel 6, a front panel 9, a bottom plate 11, and a sandwich assembly. The upper cover plate 1 is respectively connected to the rear panel 2, the first outer panel 5, the second outer panel 6, the front panel 9, and the top of the sandwich assembly. The bottom plate 11 is respectively connected to the rear panel 2, the first outer panel 5, the second outer panel 6, the front panel 9, and the bottom of the sandwich assembly. The first outer panel 5 and the second outer panel 6 are arranged between the rear panel 2 and the front panel 9. Both ends of the first outer panel 5 and the second outer panel 6 are respectively connected to the rear panel 2 and the front panel 9. The sandwich assembly is respectively arranged on the first outer panel 5 and the second outer panel 6. The first outer panel 5 and the second outer panel 6 have the same structure.

[0037] The upper cover 1, rear panel 2, front panel 9, and bottom panel 11 are made of aluminum alloy to achieve lightweight chassis. The chassis panels are connected and fixed with bolts.

[0038] The sandwich assembly includes a first inner panel 3, a first interlayer 4, a second interlayer 7, and a second inner panel 8. The first inner panel 3 is connected to the first outer panel 5, with several first interlayers 4 disposed between the first inner panel 3 and the first outer panel 5. The second inner panel 8 is connected to the second outer panel 6, with several second interlayers 7 disposed between the second inner panel 8 and the second outer panel 6. The first interlayer 4 and the second interlayer 7 are collectively referred to as the metal-rubber interlayer. The metal-rubber interlayer is strip-shaped, and the first interlayer 4 and the second interlayer 7 have the same structure. The first inner panel 3 and the second inner panel 8 have the same structure.

[0039] The first interlayer 4 and the second interlayer 7 are both made of metal wire materials with different wire diameters. The metal wires are cross-linked to form a metal rubber material with superelasticity. The wire diameter of the wire material increases from one side of the first interlayer 4 and the second interlayer 7 to the other side of the first interlayer 4 and the second interlayer 7. The wire diameter range is 0.15mm-0.3mm. Figure 9 As shown in the figure, the wire diameter of the metal rubber sandwich layer gradually decreases along the Y axis, and the density of the metal rubber sandwich layer is 4-2g / cm along the Y axis. 3The range gradually decreases. Metal wires of different diameters are arranged in a specific volume ratio of 3:1:0.15mm:0.3mm. This arrangement allows the smaller diameter areas of the metal-rubber interlayer to more sensitively capture and buffer high-frequency, minute vibrations, while the larger diameter areas of the metal-rubber interlayer focus on responding to low-frequency, larger vibrations, thus providing a buffer for components within the chassis.

[0040] For the vibration transmission of multi-layer structures, the vibration transmission rate can be used to measure its vibration reduction performance. Under simple harmonic vibration excitation, for a single degree of freedom vibration isolation system, the vibration transmission rate formula is:

[0041]

[0042] Where ξ is the damping ratio. In a multi-layer composite gradient functional metal rubber sandwich structure, the damping characteristics of the metal rubber sandwich determine the damping ratio of the entire structure. The metal rubber has a larger damping, which will increase the value, thereby affecting the vibration transmissibility. λ is the frequency ratio, ω is the excitation frequency, ω n is the natural frequency of the system.

[0043] In a multi-layer composite gradient functional metal rubber sandwich structure, because the metal rubber is made of wires of different diameters in a specific ratio and weave, its equivalent damping ratio varies with the structural and material properties. For example, the metal rubber with a thinner wire diameter of 0.15mm, close to the outer aluminum alloy layer, can more sensitively capture high-frequency micro-vibrations. Under high-frequency excitation (when λ is large), as the damping ratio ξ increases, the vibration transmissibility T decreases according to the above formula, indicating that the transmission of high-frequency vibrations can be effectively suppressed.

[0044] The first interlayer 4 and the second interlayer 7 are made of 06Cr17Ni12Mo2 stainless steel wire material, and the first inner plate 3 and the second inner plate 8 are made of copper, which has good thermal conductivity and conducts the heat in the chassis to the first interlayer 4 and the second interlayer 7.

[0045] The first interlayer 4 and the second interlayer 7 both include a clamping portion 101 and a protruding portion 102 . Both sides of the protruding portion 102 are connected to the clamping portion 101 , and a clamping groove 103 is provided on one side of the protruding portion 102 .

[0046] The protrusion 102 has an arc-shaped cross section, and the protrusion 102 protrudes in an arc shape toward the outside of the vibration damping chassis to facilitate heat conduction outward. The clamping portion 101 has a rectangular cross section and is used to fix the metal-rubber interlayer.

[0047] Several limiting rods 14 are provided on the first inner panel 3 and the second inner panel 8. The first inner panel 3 can be extended into the card slot 103 on the first interlayer 4 through the limiting rods 14 to realize the positioning and installation of the first interlayer 4. The second inner panel 8 can be extended into the card slot 103 on the second interlayer 7 through the limiting rods 14 to realize the positioning and installation of the second interlayer 7.

[0048] The first inner plate 3 and the second inner plate 8 are respectively provided with weight-reducing grooves 15 to reduce the weight of the chassis.

[0049] The first outer panel 5 and the second outer panel 6 are each provided with a plurality of grooves 13. The first interlayer 4 is provided in the grooves 13 of the first outer panel 5, and the second interlayer 7 is provided in the grooves 13 of the second outer panel 6. The outer panel is connected to the inner panel, and the metal rubber interlayer is clamped in the grooves 13.

[0050] A handle 10 is provided on the front panel 9 .

Claims

1. A vibration-damping chassis with a multi-layer composite gradient sandwich structure, characterized by: The invention comprises an upper cover plate (1), a rear panel (2), a first outer panel (5), a second outer panel (6), a front panel (9), a bottom plate (11) and a sandwich assembly, wherein the upper cover plate (1) is respectively connected to the top of the rear panel (2), the first outer panel (5), the second outer panel (6), the front panel (9) and the sandwich assembly, and the bottom plate (11) is respectively connected to the bottom of the rear panel (2), the first outer panel (5), the second outer panel (6), the front panel (9) and the sandwich assembly, the first outer panel (5) and the second outer panel (6) are arranged between the rear panel (2) and the front panel (9), and the sandwich assembly is respectively arranged on the first outer panel (5) and the second outer panel (6).

2. The vibration-damping chassis of a multi-layer composite gradient sandwich structure according to claim 1, characterized in that: The sandwich assembly comprises a first inner panel (3), a first sandwich (4), a second sandwich (7) and a second inner panel (8), wherein the first inner panel (3) is connected to the first outer panel (5), the first sandwich (4) is arranged between the first inner panel (3) and the first outer panel (5), the second inner panel (8) is connected to the second outer panel (6), and the second sandwich (7) is arranged between the second inner panel (8) and the second outer panel (6).

3. The vibration-damping chassis of a multi-layer composite gradient sandwich structure according to claim 2, characterized in that: The first interlayer (4) and the second interlayer (7) are made of filamentous material, and the diameter of the filamentous material increases from one side of the first interlayer (4) and the second interlayer (7) to the other side of the first interlayer (4) and the second interlayer (7).

4. The vibration-damping chassis of a multi-layer composite gradient sandwich structure according to claim 2, characterized in that: The first interlayer (4) and the second interlayer (7) are made of metal wire material, and the first inner plate (3) and the second inner plate (8) are made of copper.

5. A vibration damping chassis with a multi-layer composite gradient sandwich structure as claimed in claim 2, wherein the density of the first interlayer (4) and the second interlayer (7) is 4-2 g / cm from the inside to the outside. 3 The range gradually decreases.

6. The vibration-damping chassis with a multi-layer composite gradient sandwich structure according to claim 2, characterized in that: The first interlayer (4) and the second interlayer (7) both comprise a clamping portion (101) and a protruding portion (102); both sides of the protruding portion (102) are respectively connected to the clamping portion (101); and a clamping groove (103) is provided on one side of the protruding portion (102).

7. The vibration-damping chassis of the multi-layer composite gradient sandwich structure according to claim 6, characterized in that: The cross section of the protruding portion (102) is arc-shaped, and the cross section of the clamping portion (101) is rectangular.

8. The vibration-damping chassis with a multi-layer composite gradient sandwich structure according to claim 2, characterized in that: A plurality of limiting rods (14) are provided on the first inner plate (3) and the second inner plate (8), and weight-reducing grooves (15) are provided on the first inner plate (3) and the second inner plate (8), respectively.

9. The vibration-damping chassis with a multi-layer composite gradient sandwich structure according to claim 1, characterized in that: The first outer plate (5) and the second outer plate (6) are respectively provided with a plurality of grooves (13).

10. The vibration-damping chassis with a multi-layer composite gradient sandwich structure according to claim 1, characterized in that: A handle (10) is provided on the front panel (9).

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