A buffer brush type noise reduction device

Abstract

The present invention relates to a buffer brush type noise reduction device, which is installed on the car body of a train and is used for vibration reduction and noise reduction of the running train. It includes: a brush hair mounting plate, which is connected to the car body of the train; brush hairs, which are evenly distributed on the brush hair mounting plate and one end of the brush hairs is fixedly connected to the brush hair mounting plate. The brush hair mounting plate is installed on the rear half part of the top of the bogie chamber of the train car body, the rear wall surface of the bogie chamber, and the trailing edge part of the bogie chamber. The brush hairs are arranged closely and have a certain gap at the same time. When the high-speed air flow impacts the top of the brush hairs, the speed will be reduced due to the obstruction of the brush hairs, and then the low-speed air flow enters the interior of the brush hairs and collides with the mounting plate, so that the sound source intensity is greatly reduced. Due to the obstruction of the brush hairs, the conduction of sound waves will also be disrupted, thereby greatly reducing the efficiency of sound propagation. Therefore, installing the buffer brush in the rear area of the bogie chamber will effectively reduce the sound radiation in the bogie area.

Description

Technical Field

[0001] The present invention relates to a noise reduction device, and more particularly to a buffer brush type noise reduction device. Background Art

[0002] Rail transit is one of the most commonly used transportation modes in daily life. When the running speed of a high-speed train exceeds 300 km / h, the aerodynamic noise generated by it will exceed the wheel-rail rolling noise and become the main noise source. The main aerodynamic sound sources of high-speed trains can be divided into the front of the train, the bogie area, the pantograph, the car body gap, and the turbulent area at the rear of the train. Since there are many bogies in the train, the contribution of the aerodynamic noise generated by them is particularly prominent. Some studies have shown that the aerodynamic noise generated by the bogie chamber is much higher than that generated by the bogie itself. Therefore, it is of great significance to reduce the sound radiation of the bogie chamber.

[0003] At present, the noise reduction methods in the bogie area mainly focus on passive noise reduction. Most of the means are to reduce the pressure fluctuation in the bogie area by interfering with the upstream flow state, so as to achieve the purpose of reducing aerodynamic noise. For example, installing flow blocking blocks upstream and reducing the height of the bottom of the bogie chamber to change the air flow direction. However, this noise reduction method will undoubtedly greatly change the structure of the bogie area and even the entire bottom of the train, thus increasing the drag coefficient and the operation cost of the train. Another method is to use a skirt to wrap the bogie chamber. Due to the presence of the skirt, the high-speed air flow entering the bogie chamber is reduced, so the pressure fluctuation is reduced, and the aerodynamic noise generated by it is also correspondingly reduced. However, the presence of the skirt leads to the mutual isolation of the left and right sides of the train, thus increasing the risk of rollover of the train in crosswind conditions. Another method is to install a sound absorption board with porous materials in the bogie chamber to block the propagation path of aerodynamic noise to achieve the purpose of reducing noise. However, this method has high requirements for the operating environment of the bogie and is not easy to maintain. Dust and other sundries are easy to block the sound absorption board, thus reducing its noise reduction effect.

[0004] In summary, there is currently a lack of an easy-to-maintain noise reduction device for high-speed trains. Summary of the Invention

[0005] The purpose of the present invention is to provide a buffer brush type noise reduction device to overcome the defects of being easily blocked and difficult to maintain in the existing technology.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a buffer brush type noise reduction device, which is installed on the car body of the train and is used for vibration reduction and noise reduction of the running train, including: a brush mounting plate connected to the car body of the train; and brushes evenly distributed on the brush mounting plate and one end of the brushes being fixedly connected to the brush mounting plate.

[0008] As a preferred technical solution, the positions where the bristle mounting plate is installed on the train car body include one or more of the following positions: the rear half of the top of the bogie chamber; the rear wall surface of the bogie chamber; the trailing edge part of the bogie chamber.

[0009] As a preferred technical solution, one or more screw holes are provided on the bristle mounting plate and are threadedly connected to the train car body.

[0010] As a preferred technical solution, the number of the screw holes is 4.

[0011] As a preferred technical solution, the screw holes are arranged on the side of the bristle mounting plate close to the edge.

[0012] As a preferred technical solution, the bristles are perpendicularly arranged to the bristle mounting plate.

[0013] As a preferred technical solution, the bristles are obliquely arranged to the bristle mounting plate, and the included angle is in the range of 30° - 60°.

[0014] As a preferred technical solution, the bristles are straight.

[0015] As a preferred technical solution, the bristles are curved.

[0016] As a preferred technical solution, the material of the bristles is steel.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) There is a certain gap between the bristles of the present invention. Due to the scouring of air flow, dust and other sundries are not easily attached, and the noise reduction device is not easily blocked after long-term use.

[0019] (2) During maintenance, it can be cleaned with a high-pressure water gun, which is convenient and fast. It adopts a modular design and is easy to replace when damaged.

[0020] (3) The noise reduction device is installed at the rear of the bogie chamber, so it will not greatly change its geometric structure and increase the drag coefficient.

[0021] (4) The noise reduction device is composed of a bristle mounting plate and bristles, and can be made of common materials, with low cost. Description of the Drawings

[0022] Figure 1 It is the bottom view of the installation position of the noise reduction device in the embodiment;

[0023] Figure 2 It is the side view of the installation position of the noise reduction device in the embodiment;

[0024] Figure 3 Schematic diagram of the empty bogie chamber of the leading car of the train head

[0025] Figure 4 Front view of the noise reduction device in the embodiment

[0026] Figure 5 is Figure 4 Cross-sectional view at position A in

[0027] Figure 6 Side view of the noise reduction device in Embodiment 1

[0028] Figure 7 Side view of the noise reduction device in Embodiment 2

[0029] Figure 8 Side view of the noise reduction device in Embodiment 3

[0030] wherein, 1. Bogie chamber, 2. Buffer brush type noise reduction device, 201. Bristle mounting plate, 202. Bristles, 203. Screw hole Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined

[0033] Embodiment 1

[0034] As Figure 3The figure shows a schematic diagram of the empty bogie chamber of the leading car of a train. The noise reduction device in this embodiment is arranged at the rear half of the top of bogie chamber 1, the rear wall surface of bogie chamber 1, and the trailing edge part of bogie chamber 1. Since the covered area is irregular, multiple buffer devices are spliced. At the curved surface, the shape of the brush mounting plate is adjusted to make the noise reduction device match the installation area. The specific installation positions are as Figure 1 and Figure 2 described.

[0035] As Figure 4 and Figure 5 described, the buffer brush type noise reduction device in this embodiment includes: a brush mounting plate 201, which is connected to the car body of the train; brushes 202, which are evenly distributed on the brush mounting plate 201 and one end of the brush 202 is fixedly connected to the brush mounting plate 201. The brush mounting plate 201 is rectangular, and 4 screw holes 203 are arranged on one side of the brush mounting plate 201 close to the edge and are threadedly connected to the car body of the train.

[0036] As Figure 6 shown in the side view of the noise reduction device in this embodiment, the brushes 202 are perpendicular to the brush mounting plate 201. The brushes 202 are made of steel filaments, with a density of about 7.8e3 kg / m³, a diameter of about 1.5 mm - 3 mm, and a length of about 40 mm - 70 mm. The brushes are evenly distributed on the base, and the distribution density is about 15 - 20 per square centimeter. The steel wire brushes on the buffer brush type noise reduction device are arranged closely and have a certain gap. When the high-speed air flow impacts the top of the brushes, the speed will be reduced due to the obstruction of the brushes. Then the low-speed air flow enters the interior of the brushes and collides with the mounting plate, but the speed is much lower than the case without brushes, so the sound source intensity is greatly reduced. At the same time, due to the obstruction of the brushes, the conduction of sound waves will also be disrupted, so that the efficiency of sound propagation is greatly reduced. Therefore, installing the buffer brush in the rear area of the bogie chamber will reduce the sound radiation in the bogie area.

[0037] Embodiment 2

[0038] Compared with Embodiment 1, the brushes 202 in this embodiment are inclined to the brush mounting seat 201 at an angle of 45°. The side view of the noise reduction device is as Figure 7 described.

[0039] Embodiment 3

[0040] Compared with Embodiment 1, the brushes in this embodiment are curved, and the bending amplitude is 5 mm - 15 mm. The side view of the noise reduction device is as Figure 8 described.

[0041] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A buffer brush type noise reduction device, characterized in that, Installed on the car body of the train for vibration reduction and noise reduction during the operation of the train, including: A brush mounting plate (201), which is connected to the car body of the train; Brushes (202), evenly distributed on the brush mounting plate (201) and one end of the brushes (202) is fixedly connected to the brush mounting plate (201), The positions where the brush mounting plate (201) is installed on the train car body include the following positions: The rear half of the top of the bogie chamber; The rear wall surface of the bogie chamber; The trailing edge part of the bogie chamber, The material of the brushes is steel, The steel wire brushes (202) on the buffer brush type noise reduction device are arranged closely and have a certain gap. When the high-speed air flow impacts the top of the brushes (202), it is blocked by the brushes (202) and decelerates. The low-speed air flow enters the inside of the brushes (202) and collides with the brush mounting plate (201), and the speed is much lower than the case without brushes, thereby reducing the sound source intensity. At the same time, due to the blocking effect of the brushes (202), the conduction of sound waves is damaged, so that the efficiency of sound propagation decreases. One or more screw holes (203) are provided on the brush mounting plate (201) and are threadedly connected to the car body of the train, The number of the screw holes (203) is 4, The screw holes (203) are arranged on the side of the brush mounting plate (201) close to the edge, The brushes (202) are arranged perpendicular to the brush mounting plate (201), The brushes (202) are linear, made of steel filaments, with a density of 7.8e3 kg / m³, a diameter of 1.5 mm - 3 mm, a brush length of 40 mm - 70 mm, and the brushes are evenly distributed on the base with a distribution density of 15 - 20 per square centimeter.

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