High-noise-reduction-performance acoustic enclosure applied to roof of high-speed motor train unit

Abstract

The utility model relates to a high-noise-reduction sound insulation cover applied to a train roof of a high-speed motor train unit, and belongs to a sound insulation and noise reduction device above the train roof of the high-speed motor train unit. The sound-absorbing filling block is bonded and fixedly filled in the sound-insulating cover framework through an adhesive, and the light sound-insulating pad is respectively bonded with the surfaces of the sound-insulating cover framework and the sound-absorbing filling block to form a closed structure. The sound insulation board has the advantages that the structure is novel, and a more remarkable noise reduction effect is achieved through combined use of the sound insulation steel plate, the lightweight sound insulation pad in the sound absorption filling block, the sound absorption material glass wool board and the aluminum fiber sound absorption board. The framework reinforcing ribs are welded to the back of the metal skin sound insulation steel plate, and after the sound insulation cover and a train body are installed, bolt fastening force is dispersed on the whole framework reinforcing ribs instead of being only stressed on the skin, so that the strength of an installation structure is guaranteed, and the functionality and safety of a high-speed train at the position are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sound insulation and noise reduction device of high speed train roof, especially to a kind of high noise reduction performance sound shield applied to high speed motor train unit train roof. BACKGROUND

[0002] With the high-speed development of railway industry in our country, the demand for noise reduction of motor train unit is more urgent, compared with the running speed of traditional motor train unit, high speed motor train unit is faster, and the running speed is as high as 400km / h, so the noise generated by pantograph increases, the noise generated by pantograph is transmitted to passenger room through roof profile, which affects the comfort of passengers in passenger room, and through whole vehicle test, noise is mainly concentrated above 300Hz frequency under pantograph.

[0003] Since the sound shield is installed above the flat roof area of the vehicle body, directly below the pantograph, it is an external installation structure of the vehicle body, so the safety requirement standard of the sound shield is very high, while meeting the high noise reduction performance index, the overall structure safety after installation needs to be guaranteed, in order to meet the use conditions in the life cycle of vehicle, the stepping strength guarantee in the maintenance process needs to be met, two 100kg maintenance workers carrying 100kg maintenance equipment stepping on the sound shield need to ensure that the sound shield does not be damaged, and the installation safety and structural strength stability of the sound shield after installation are guaranteed.The existing structure is that metal skin is directly connected with vehicle body, and the installation stress of the whole sound shield is only on the metal skin, so it cannot effectively meet the structural safety requirement.

[0004] Therefore, in view of the current application demand, in response to the situation of noise increase after train speedup, a high noise reduction performance sound shield with stable structure safety and installed under pantograph is needed to reduce the noise generated by pantograph during train running, ensure the comfort of passengers in passenger room, ensure the safety and stability of structural design, and meet the use standard requirement of high speed motor train unit. SUMMARY

[0005] The utility model provides a kind of high noise reduction performance sound shield applied to high speed motor train unit train roof, to meet the structure safety and noise reduction requirement of high speed motor train unit.

[0006] The technical scheme adopted by the utility model is: including sound shield framework, sound-absorbing filling block and light sound insulation pad, wherein the sound-absorbing filling block is fixed and filled in the sound shield framework by adhesive bonding, and the light sound insulation pad is bonded with the surface of the sound shield framework and the sound-absorbing filling block to form a closed structure.

[0007] The sound shield framework includes sound insulation steel plate, edge frame and reinforcing rib, wherein the reinforcing rib is welded by aluminum profile, and the sound insulation steel plate is connected into an integral structure with the edge frame and the reinforcing rib by rivet connection.

[0008] The sound insulation steel plate comprises an outer steel plate, a viscoelastic polymer and an inner steel plate, wherein the outer surface and the inner surface of the viscoelastic polymer are integrally formed with the outer steel plate and the inner steel plate respectively through adhesive pressure bonding.

[0009] The sound absorption filling block comprises upper light sound insulation pads, glass wool boards, aluminum fiber sound absorption boards and lower light sound insulation pads, wherein the upper light sound insulation pads, the glass wool boards, the aluminum fiber sound absorption boards and the light sound insulation pads are integrally formed through an adhesive.

[0010] The upper light sound insulation pad is made of rubber plastic material, has a density of 1700-1800 kg / m³ and a sound insulation amount of 34-36 dB.

[0011] The glass wool board is a glass fiber composite material, has a density of 50-70 kg / m³ and a fiber diameter of 5.5-6.5 um, and has a reticular fiber structure.

[0012] The aluminum fiber sound absorption board has a density of 1.5-1.7 g / cm³ and a thickness of 1.6-1.7 mm.

[0013] The lower light sound insulation pad is made of rubber plastic material, has a density of 1700-1800 kg / m³ and a sound insulation amount of 34-36 dB.

[0014] The light sound insulation pad is made of rubber plastic material, has a density of 1700-1800 kg / m³ and a sound insulation amount of 34-36 dB.

[0015] The sound insulation steel plate comprises an outer steel plate, a viscoelastic polymer and an inner steel plate, wherein the outer surface and the inner surface of the viscoelastic polymer are integrally formed with the outer steel plate and the inner steel plate respectively through adhesive pressure bonding.

[0016] The sound insulation steel plate comprises an outer steel plate, a viscoelastic polymer and an inner steel plate, wherein the outer surface and the inner surface of the viscoelastic polymer are integrally formed with the outer steel plate and the inner steel plate respectively through adhesive pressure bonding. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the utility model;

[0018] Figure 2 is an assembly drawing of the utility model;

[0019] The sound insulation steel plate comprises an outer steel plate, a viscoelastic polymer and an inner steel plate, wherein the outer surface and the inner surface of the viscoelastic polymer are integrally formed with the outer steel plate and the inner steel plate respectively through adhesive pressure bonding.Figure 3 is Figure 1 A-A partial sectional view of the utility model;

[0020] Figure 4 is the structure diagram of the utility model soundproof cover framework;

[0021] Figure 5 is the structure diagram of the utility model soundproof steel plate;

[0022] Figure 6 is the structure diagram of the utility model sound-absorbing filling block;

[0023] Figure 7 is the sound insulation amount curve comparison diagram of the utility model and traditional soundproof cover:

[0024] Figure 8 is the sound insulation amount curve comparison diagram of the utility model soundproof steel plate and ordinary steel plate. DETAILED DESCRIPTION

[0025] Referring to Figure 1 , 2 , including soundproof cover framework 1, sound-absorbing filling block 2 and light sound insulation pad 3, wherein sound-absorbing filling block 2 is filled in soundproof cover framework 1 by adhesive bonding and fixing, light sound insulation pad 3 is respectively bonded with the surface of soundproof cover framework 1 and sound-absorbing filling block 2 to form a closed structure, so that the soundproof cover guarantees good sealing property.

[0026] Referring to Figure 3 , 4 , the soundproof cover framework 1 includes soundproof steel plate 1.1, edge frame 1.2 and reinforcing rib 1.3, wherein reinforcing rib 1.3 is welded by aluminum profile, and soundproof steel plate 1.1 is connected into an integral structure with edge frame 1.2 and reinforcing rib 1.3 by rivet.

[0027] Referring to Figure 5 , the soundproof steel plate 1.1 includes outer steel plate 1.1.1, viscoelastic polymer 1.1.2 and inner steel plate 1.1.3, wherein the outer surface and the inner surface of viscoelastic polymer 1.1.2 are respectively connected into an integral structure with outer steel plate 1.1.1 and inner steel plate 1.1.3 by adhesive pressure bonding, metal steel plate is used as external support structure, viscoelastic polymer is used as damping layer core material to bond and separate two metal plates, and good noise reduction effect is achieved in the noise frequency band above 300Hz.

[0028] Referring to Figure 3 , 6The sound-absorbing filling block 2 comprises an upper light sound insulation pad 2.1, a glass wool board 2.2, an aluminum fiber sound-absorbing board 2.3 and a lower light sound insulation pad 2.4, wherein the upper light sound insulation pad 2.1, the glass wool board 2.2, the aluminum fiber sound-absorbing board 2.3 and the light sound insulation pad 2.4 are integrally connected through an adhesive.

[0029] The upper light sound insulation pad 2.1 is made of rubber plastic material, has a density of 1700-1800 kg / m³, is 25% lighter than a traditional sound insulation pad, has a sound insulation amount of 34-36 dB, and realizes the light structure of the sound insulation cover through the material.

[0030] The glass wool board 2.2 is a glass fiber composite material, has a density of 50-70 kg / m³, a fiber diameter of 5.5-6.5 um, and a net fiber structure, which can improve the sound absorption function, enhance the noise reduction effect, and make the noise reduction coefficient NRC reach 0.4.

[0031] The aluminum fiber sound-absorbing board 2.3 has a density of 1.5-1.7 g / cm³ and a thickness of 1.6-1.7 mm, and is a new type of sound-absorbing fiber material which can realize excellent noise reduction performance in combination with other sound insulation materials, has a noise reduction coefficient NRC of 0.6, and has good sound absorption effect.

[0032] The lower light sound insulation pad 2.4 is made of rubber plastic material, has a density of 1700-1800 kg / m³, is 25% lighter than a traditional sound insulation pad, has a sound insulation amount of 34-36 dB, and realizes the light structure of the sound insulation cover through the material.

[0033] The light sound insulation pad 3 is made of rubber plastic material, has a density of 1700-1800 kg / m³, is 25% lighter than a traditional sound insulation pad, has a sound insulation amount of 34-36 dB, and realizes the light structure of the sound insulation cover through the material.

[0034] The effect of the utility model is further illustrated by test data of a test experiment.

[0035] The utility model can satisfy that two 100kg maintenance workers hold 100kg maintenance equipment to step on the sound insulation cover to carry out periodic maintenance, ensure that the sound insulation cover is not damaged after maintenance, can bear a dynamic load fatigue test of pressure ±3500pa, frequency 4Hz and cycle 20 million times, ensure that the sound insulation cover has no permanent deformation and damage, and ensure the installation safety and stable structure strength of the sound insulation cover after installation through the above structure design.

[0036] Referring to Figure 7, the weighted sound insulation quantity of the traditional sound insulation cover is 39.6dB, the weighted sound insulation quantity of the utility model is 43dB, the overall sound insulation quantity is improved by 3.4dB, and the sound insulation quantity is improved significantly between the high frequencies in the noise frequency range 200Hz,

[0037] Referring to Figure 8 The sound insulation steel plate serves as a composite material for sound insulation and damping, and has a good noise reduction effect in the noise frequency range above 300Hz.

Claims

1. A high noise reduction performance sound shield applied to the roof of a high-speed EMU train, characterized in that: The soundproof cover framework, sound-absorbing filling block and light sound insulation pad are included, wherein the sound-absorbing filling block is fixedly filled in the soundproof cover framework by adhesive, and the light sound insulation pad is adhered to the surface of the soundproof cover framework and the sound-absorbing filling block to form a closed structure.

2. The high noise reduction performance sound shield for application to the roof of a high-speed train according to claim 1, characterized in that: The soundproof cover framework includes soundproof steel plate, edge frame and reinforcing rib, wherein the reinforcing rib is welded by aluminum profile, and the soundproof steel plate is connected with the edge frame and the reinforcing rib by rivet to form an integral structure.

3. The high noise reduction performance sound shield for application to the roof of a high-speed train according to claim 2, characterized in that: The soundproof steel plate includes outer steel plate, viscoelastic polymer and inner steel plate, wherein the outer surface and the inner surface of the viscoelastic polymer are integrally connected with the outer steel plate and the inner steel plate by adhesive pressure bonding.

4. The high noise reduction performance sound shield for application to the roof of a high-speed train according to claim 1, characterized in that: The sound-absorbing filling block includes upper light sound insulation pad, glass wool board, aluminum fiber sound-absorbing board and lower light sound insulation pad, wherein the upper light sound insulation pad, the glass wool board, the aluminum fiber sound-absorbing board and the light sound insulation pad are integrally connected by adhesive.

5. The high noise reduction performance sound shield for application to the roof of a high speed train according to claim 4, characterized in that: The upper light sound insulation pad is made of rubber plastic material, the density is 1700-1800 kg / m³, and the sound insulation amount is 34-36 dB.

6. The high noise reduction performance sound shield for application to the roof of a high speed train according to claim 4, characterized in that: The glass wool board is a glass fiber composite material, the density is 50-70 kg / m³, the fiber diameter is 5.5-6.5 um, and the structure is net-like fiber structure.

7. The high noise reduction performance sound shield for application to the roof of a high speed train according to claim 4, characterized in that: The aluminum fiber sound-absorbing board has a density of 1.5-1.7 g / cm³ and a thickness of 1.6-1.7 mm.

8. The high noise reduction performance sound shield for application to the roof of a high speed train set of claim 4, wherein: The lower light sound insulation pad is made of rubber plastic material, the density is 1700-1800 kg / m³, and the sound insulation amount is 34-36 dB.

9. The high noise reduction performance sound shield for application to the roof of a high speed train according to claim 1, characterized in that: The light sound insulation pad is made of rubber plastic material, the density is 1700-1800 kg / m³, and the sound insulation amount is 34-36 dB.

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