High-speed train pantograph with low-noise sharp elliptical arm lever and insulator
By designing a pointed oval boom and insulator structure, the problem of pantograph aerodynamic noise in high-speed trains is solved, and the noise reduction effect is achieved is achieved, which improves riding comfort and environmental quality along the route.
Patent Information
- Application Number
- CN202421546752.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-02
AI Technical Summary
When high-speed trains are running, aerodynamic noise generated by the pantograph system becomes the main source of noise, affecting the comfort of trains and the lives of residents along the route. It is difficult for the existing technology to effectively reduce this noise.
The upper and lower arm rods and insulators with pointed elliptical shape are designed, with the incoming flow direction being the major axis of the pointed elliptical and the minor axis of the incoming flow direction being the minor axis of the pointed elliptical. It is connected through an articulated structure to reduce the pressure and vortex strength of the arm rods and insulators in the air flow.
At the same speed, the pantograph aerodynamic noise is reduced, especially in specific directions and far-field positions, and the sound pressure level is reduced by 3-5dB, improving riding comfort and reducing the noise impact on residents along the route.
Smart Images
Figure CN223058812U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of high-speed trains, and in particular relates to a low-noise pointed elliptical arm and an insulator pantograph for high-speed trains. Background Art
[0002] As the speed of high-speed trains continues to increase, aerodynamic noise will exceed the proportion of other noises of high-speed trains and become the main noise. Studies have shown that the aerodynamic noise of high-speed trains is proportional to the sixth power of the train speed. While aerodynamic noise affects the comfort of train rides, it also affects the lives of residents along the railway and the structure of railway facilities. The pantograph system is one of the main areas where aerodynamic noise of high-speed trains is generated.
[0003] When a high-speed train is running, the main part of the pantograph located on the roof is directly exposed to the air, and interacts with the air to generate strong aerodynamic noise. The utility model reasonably optimizes the noise reduction of the upper arm, lower arm and insulator structure of the pantograph of a high-speed train with large aerodynamic noise. Utility Model Content
[0004] The utility model aims to provide a low-noise pointed elliptical arm and insulator high-speed train pantograph, which, on the basis of maintaining the original structure of the high-speed train pantograph as much as possible, performs reasonable noise reduction optimization to achieve the purpose of reducing the aerodynamic noise of the high-speed train pantograph.
[0005] The utility model adopts the following technical scheme: On the one hand, the utility model provides a low-noise pointed elliptical arm and insulator high-speed train pantograph, which is installed on the roof of the train to receive current from the power grid. The cross-sections of the upper arm, lower arm and insulator of the pantograph are all pointed elliptical shapes, with the long axis of the pointed ellipse facing the incoming current direction and the short axis of the pointed ellipse perpendicular to the incoming current direction. The top of the upper arm is connected to the bow head component, the bottom of the upper arm is connected to the top of the lower arm through a hinged structure, and the bottom of the lower arm is connected to the base frame. The base frame is connected to three insulators.
[0006] On the other hand, the utility model provides a low-noise pointed elliptical arm and insulator high-speed train pantograph, which is mainly composed of a carbon slide plate, a bow angle, a balance rod, a pointed elliptical upper arm, an upper guide rod, a hinged structure, a pointed elliptical lower arm, a lower guide rod, a chassis, an airbag and a pointed elliptical insulator; the carbon slide plate is located at the top of the pantograph bow head, the bow angle is located at both ends of the bow head, the upper arm and the lower arm are components supporting the bow head, and the pantograph upper arm, lower arm and insulator adopt the above-mentioned pointed elliptical structure.
[0007] Compared with the prior art, the utility model has the following advantages:
[0008] 1) At the same running speed, the upper and lower arm rods of the pointed ellipse and the insulators of the pantograph, as well as the upper and lower arm rods and insulators of the streamlined pantograph, are subjected to less pressure on the flow-facing surface compared to the original pantograph rods. The vortex intensity in the rear area of the lower arm rods and insulators of the pointed ellipse and the streamlined pantograph is smaller, and the pressure fluctuations behind the lower arm rods and hinge parts of the pointed ellipse and the streamlined pantograph are reduced.
[0009] 2) When the running speed is 350 km / h, the maximum sound pressure level at 7.5 m in the xOy plane of the upper and lower arm rods and insulators of the pointed ellipse and the streamlined pantograph can be reduced by 3.51 dB, with a reduction rate of 4.15%. The noise reduction in the 150° direction in the yOz plane is 3.15 dB, with a reduction rate of 3.56%. The maximum noise reduction in the 150° direction in the xOz plane is approximately 3.9 dB, with a reduction rate of 4.45%.
[0010] 3) The maximum sound pressure level at 25 m in the far field on the left side of the pantograph can be reduced by 3.1 dB, with a reduction rate of 4.1%. The maximum sound pressure level at 25 m in the far field on the right side of the pantograph can be reduced by 5.1 dB, with a reduction rate of 6.7%. Description of the Drawings
[0011] The schematic diagrams in the specification that form a part of this application are provided to further understand the present utility model and do not unduly limit the present utility model.
[0012] Figure 1 It is a schematic diagram of the structure of the pointed ellipse arm rod and insulator pantograph.
[0013] Figure 2 It is a schematic diagram of the structure of the upper and lower arm rods and insulators of the pointed ellipse.
[0014] Figure 3 It is the velocity distribution diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0015] Figure 4 It is the pressure distribution diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0016] Figure 5 It is the vorticity distribution diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0017] Figure 6 It is the pressure fluctuation distribution diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0018] Figure 7 It is the three-dimensional coherent structure diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0019] Figure 8 It is the aerodynamic noise directivity characteristic diagram of pantographs with arm rods and insulators of different shapes at the same speed.
[0020] Figure 9 The overall sound pressure level diagram of the pantograph at a distance of 25 m in the far field of the pantograph with different-shaped boom arms and insulators at the same speed.
[0021] Figure 10 The sound pressure level diagrams of various components of the pantograph at a distance of 25 m in the far field of the pantograph with different-shaped boom arms and insulators at the same speed.
[0022] Figure 10 The letters in the figure represent the pantograph components as follows: A - bow head; B - upper boom arm; C - upper guide rod; D - hinge structure; E - lower boom arm; F - lower guide rod; G - underframe; H - left insulator; I - right insulator; J - rear insulator; K - small insulator; L - car body.
[0023] Figure 1 The overall structural schematic diagram of the pantograph based on such upper and lower boom arms and insulators.
[0024] In the attached drawings: 1. Carbon sliding plate; 2. Balance rod; 3. Carbon sliding plate support; 4. Bow angle; 5. Upper guide rod; 6. Upper boom arm; 7. Hinge structure; 8. Lower guide rod; 9. Lower boom arm; 10. Small insulator; 11. Underframe; 12. Insulator; 13. Airbag front baffle; 14. Airbag. Detailed implementation manners
[0025] The present utility model provides a pantograph for a high-speed train with a low-noise sharp elliptical boom arm and insulator, wherein the cross-sections of the upper boom arm, the lower boom arm and the insulator are all sharp ellipses, the long axis of the sharp ellipse faces the oncoming flow direction, and the short axis of the sharp ellipse is perpendicular to the oncoming flow direction.
[0026] The cross-sections of the upper and lower boom arms and the insulator of a low-noise high-speed train pantograph are all sharp ellipses, and the ratio of the length of the long axis to the length of the short axis of the sharp ellipse is designed in the range of 1.5 to 2. The long axis of the sharp ellipse faces the oncoming flow direction, and the short axis of the sharp ellipse is perpendicular to the oncoming flow direction.
[0027] The design of the sharp elliptical boom arm reduces the pressure on the oncoming flow surface of the pantograph boom arm and insulator, and reduces the vortex intensity in the area behind the lower boom arm and insulator.
[0028] When the operating speed is the same, the pressure fluctuation in the area behind the lower boom arm and insulator of the pantograph with a sharp elliptical boom arm and insulator is reduced. The vortex speed behind the lower boom arm and insulator is weakened. Compared with the pantograph of the original structure, the pantograph with a sharp elliptical boom arm and insulator forms smaller-scale vortices behind the lower boom arm and insulator.
[0029] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A pantograph for a high-speed train with a low-noise sharp elliptical arm and insulator, characterized in that: The main components include a bow head, a pointed elliptical upper arm rod, a hinged structure, a pointed elliptical lower arm rod, a chassis, an airbag, and a pointed elliptical insulator. The bow head is connected to the top of the pointed elliptical upper arm rod. The bottom of the pointed elliptical upper arm rod is connected to the top of the pointed elliptical lower arm rod through a hinged structure. The bottom of the pointed elliptical lower arm rod is connected to the chassis, and the chassis is connected to the pointed elliptical insulator. The upper arm rod, the lower arm rod, and the insulator are of a pointed elliptical shape structure, with the long axis of the pointed ellipse facing the oncoming flow direction and the short axis perpendicular to the oncoming flow direction.
2. The pantograph for high-speed train with a low-noise sharp elliptical arm and insulator according to claim 1, characterized in that: The pointed ellipses of the upper arm rod, the lower arm rod, and the insulator are variable-diameter pointed ellipses.
3. A pantograph for a high-speed train with a low-noise sharp elliptical arm and insulator, according to claim 1, characterized in that: The upper arm rod, the lower arm rod, and the insulator vary due to different pantograph models and installation and mating requirements.