A jet-type noise reduction device for the pantograph slider of a rail transit vehicle

Abstract

The present invention relates to a jet noise reduction device for a pantograph slider of a rail transit vehicle. The device includes a first jet assembly and a second jet assembly arranged in parallel, and a gas collection assembly. The first jet assembly includes a first bow-shaped jet pipe (204) provided with a plurality of jet holes (205) and two first connecting pipes (202) mirror-symmetrically arranged at the bottom of the first bow-shaped jet pipe (204). The second jet assembly includes a second bow-shaped jet pipe (206) provided with a plurality of jet holes (205) and two second connecting pipes (203) mirror-symmetrically arranged at the bottom of the second bow-shaped jet pipe (206). The first bow-shaped jet pipe (204) and the second bow-shaped jet pipe (206) are connected to the gas collection assembly through the first connecting pipes (202) and the second connecting pipes (203). Compared with the prior art, the present invention collects gas by using the driving force of the train in front, without the need for an extra power device to provide the air pressure required for jetting; and the holes are relatively large and not easily blocked, without the need for excessive maintenance.

Description

Technical Field

[0001] The present invention relates to the field of pantograph-catenary systems, and particularly to a jet noise reduction device for a pantograph slider. Background Art

[0002] Rail transit has become an important way for urban residents to travel daily. When the operating 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 pantograph, bogie area, head, car body gap, and tail turbulence area. Since the pantograph is located on the top of the train, it is difficult to shield the aerodynamic noise generated by it by means such as a sound barrier, so it has attracted much attention. Some studies have shown that the main sound source parts of the pantograph can be divided into the bow head part, the upper and lower wall rod connection part, and the underframe part in turn. Therefore, reducing the sound radiation of the bow head part is of great significance.

[0003] At present, the noise reduction methods in the pantograph bow head area mainly focus on passive noise reduction. Most of the means are to reduce the aerodynamic noise by interfering with the vortex shedding of the slider. For example, porous materials are installed on the surface of the slider to reduce vortex shedding. However, this noise reduction method will greatly increase the weight of the bow head and increase the operating cost of the train. Moreover, the pores are easily blocked by dust in the air and require a lot of daily maintenance. Another method is to process the slider in the span direction into a wavy shape so that the phases of the vortices separated from the slider are staggered to cancel part of the sound pressure. But this method can only achieve good noise reduction effect on the noise at a certain angle. Another method is to open through holes on the surface of the slider to reduce the intensity of vortex shedding, thereby reducing the sound radiation. But this method will generate a howling sound from the front-to-back through holes after the train reaches a certain speed, which will instead increase the aerodynamic noise.

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

[0005] The purpose of the present invention is to provide a jet noise reduction device for a pantograph slider of a rail transit vehicle in order to overcome at least one of the defects existing in the above-mentioned prior art.

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

[0007] A jet-type noise reduction device for the pantograph slider of a rail transit vehicle. The device includes a first jet component and a second jet component arranged in parallel, and a gas collection component. The first jet component includes a first arcuate jet pipe provided with a plurality of jet holes and two first connecting pipes mirror-symmetrically arranged at the bottom of the first arcuate jet pipe. The second jet component includes a second arcuate jet pipe provided with a plurality of jet holes and two second connecting pipes mirror-symmetrically arranged at the bottom of the second arcuate jet pipe. The first arcuate jet pipe and the second arcuate jet pipe are connected to the gas collection component through the first connecting pipe and the second connecting pipe.

[0008] Further, the gas collection component mechanism includes a gas collection pipe. The opening on the side of the gas collection pipe for collecting gas faces the running direction of the rail transit vehicle. The opening on the other side of the gas collection pipe is connected to the first connecting pipe and the second connecting pipe.

[0009] Further, the gas collection pipe is of streamline design. More specifically, from the opening on the side of the gas collection pipe for collecting gas to the opening on the other side of the gas collection pipe connected to the first connecting pipe and the second connecting pipe, the pipe diameter gradually decreases.

[0010] Further, the first arcuate jet pipe, the second arcuate jet pipe, the first connecting pipe and the second connecting pipe are all rectangular pipes.

[0011] Further, the four corners of the inner wall of the rectangular pipe are passivated.

[0012] Further, the first arcuate jet pipe, the first connecting pipe and the gas collection pipe are interconnected; the second arcuate jet pipe, the second connecting pipe and the gas collection pipe are interconnected.

[0013] Further, the first arcuate jet pipe and the second arcuate jet pipe are both installed on the leeward side of the pantograph slider. More specifically, the first arcuate jet pipe and the second arcuate jet pipe are closely attached to the leeward side of the pantograph slider and fixed to the pantograph by spot welding.

[0014] Further, the jet holes are located on the side of the first arcuate jet pipe and the second arcuate jet pipe away from the pantograph slider.

[0015] Further, the jet holes are arranged in one of a single straight line arrangement, a double straight line arrangement, an up-and-down staggered arrangement or a wavy arrangement.

[0016] More specifically, the jet holes are arranged in a single straight line, with the number of jet holes being 10 - 15, the hole width being 3 - 5 mm, and the hole length being 10 - 20 mm. The jet holes are arranged in a double straight line, with the distance between the two rows of holes being 6 - 7 mm, the number of jet holes in each row being 10 - 15, the hole width being 2 - 3 mm, and the hole length being 10 - 20 mm. The jet holes are arranged in an up-and-down staggered pattern, with the distance between the two rows of holes being 6 - 7 mm, the number of jet holes in each row being 5 - 8, the hole width being 2 - 3 mm, and the hole length being 10 - 20 mm. The jet holes are arranged in a wavy pattern, with the number of jet holes being 3 - 5, the hole width being 2 - 3 mm, the wavy pitch being 15 - 25 mm, and the height being 7 - 9 mm.

[0017] Furthermore, the material of the device is one of aluminum, aluminum alloy, magnesium alloy or titanium alloy, preferably aluminum.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The production material of the present invention can be lightweight materials such as aluminum, aluminum alloy, magnesium alloy or titanium alloy, with a relatively light weight and low cost;

[0020] (2) The present invention uses the gas collected by the forward power of the rail transit vehicle, and there is no need for an extra power device to provide the air pressure required for jetting;

[0021] (3) The pore channels of the present invention are relatively large, not easily blocked, and do not require excessive maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Front view of the noise reduction device in Embodiment 1;

[0023] Figure 2 Rear view of the noise reduction device in Embodiment 1;

[0024] Figure 3 Schematic diagram of the air flow collection port in Embodiment 1;

[0025] Figure 4 Cross-sectional view of the air flow collection port in Embodiment 1;

[0026] Figure 5 Cross-sectional view of the connecting pipe in Embodiment 1;

[0027] Figure 6 Cross-sectional view of the jet pipe and jet holes in Embodiment 1;

[0028] Figure 7 Schematic diagrams of different forms of jet holes in Embodiments 1 - 4;

[0029] Figure 8 Schematic diagram of the installation position of the noise reduction device of the present invention;

[0030] As shown in the figure: 1 - pantograph; 2 - jet noise reduction device; 201 - air flow collection pipe; 202 - first connecting pipe; 203 - second connecting pipe; 204 - first arcuate jet pipe; 205 - jet hole; 206 - second arcuate jet pipe. Detailed implementation mode

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 should not be construed 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 Figures 1-7 shown, a jet noise reduction device for a pantograph slider of a rail transit vehicle, the device includes a first jet assembly and a second jet assembly arranged in parallel, and a gas collection assembly; the first jet assembly includes a first arcuate jet pipe 204 provided with a plurality of jet holes 205 and two first connecting pipes 202 mirror - arranged at the bottom of the first arcuate jet pipe 204; the second jet assembly includes a second arcuate jet pipe 206 provided with a plurality of jet holes 205 and two second connecting pipes 203 mirror - arranged at the bottom of the second arcuate jet pipe 206; the first arcuate jet pipe 204 and the second arcuate jet pipe 206 are connected to the gas collection assembly through the first connecting pipe 202 and the second connecting pipe 203.

[0035] The gas collection component mechanism includes a gas collection pipe 201; one side opening of the gas collection pipe 201 for collecting gas faces the running direction of the rail transit vehicle; the opening on the other side of the gas collection pipe 201 is connected to the first connecting pipe 202 and the second connecting pipe. The gas collection pipe 201 is designed in a streamlined shape. The first arcuate jet pipe 204, the second arcuate jet pipe 206, the first connecting pipe 202 and the second connecting pipe 203 are all rectangular pipes. The four corners of the inner wall of the rectangular pipe are passivated. The first arcuate jet pipe 204, the first connecting pipe 202 and the gas collection pipe 201 are interconnected; the second arcuate jet pipe 206, the second connecting pipe 203 and the gas collection pipe 201 are interconnected. The first arcuate jet pipe 204 and the second arcuate jet pipe 206 are both installed on the leeward side of the pantograph slider. The jet holes 205 are located on the side of the first arcuate jet pipe 204 and the second arcuate jet pipe 206 away from the pantograph slider. The jet holes 205 are arranged in a single straight line. The material of the device is aluminum.

[0036] As Figure 8 The above is a schematic installation diagram of the vibration reduction and noise reduction device. In this embodiment, the air flow collection pipe 201, the first connecting pipe 202, the second connecting pipe 203, the first arcuate jet pipe 204, the jet holes 205 and the second arcuate jet pipe 206 are assembled into a noise reduction device by welding, and the device is fixed to the bow head frame by welding. After the first arcuate jet pipe 204 and the second arcuate jet pipe 206 are attached to the leeward side of the pantograph slider, they are fixed by spot welding.

[0037] In this embodiment, the jet holes 205 open on the leeward side of the first arcuate jet pipe 204 and the second arcuate jet pipe 206 and are arranged in a straight line. The hole width is about 4 mm, and the length of each hole is about 10 - 20 mm. 10 - 15 openings are distributed on the leeward side of the jet pipe. After the air flow jets out from the jet holes, it occupies the rear part of the slider, forming an air flow barrier, which interferes with the formation of vortices at the trailing edge of the slider. Thus, it partially prevents the high-speed air flow separated from the leading edge from hitting the surface of the slider during the vortex formation process. The pressure fluctuation on the surface of the slider is thus reduced, and the lift fluctuation of the slider and the dipole sound source on its surface are also reduced by 40% - 50% accordingly, so as to achieve the purpose of reducing aerodynamic noise. The peak value of the aerodynamic noise spectrum is reduced by about 3 - 4 dB.

[0038] Embodiment 2

[0039] Compared with Embodiment 1, the jet holes 205 in this embodiment are arranged in a double row, as Figure 7 described. The hole width is about 2.5 mm, and the length of each hole is the same as that in Embodiment 1. The double-row hole pitch is about 7 mm.

[0040] Embodiment 3

[0041] Compared with Embodiment 1, the jet holes 205 in this embodiment are arranged in a staggered pattern, as Figure 7As described above. The hole width is about 2.5 mm, and the length of each hole is the same as that in Example 1. 5-8 openings are distributed in each column, and the double-column hole pitch is about 7 mm.

[0042] Example 4

[0043] Compared with Example 1, the jet holes 205 in this example are arranged in a wavy pattern, as Figure 7 described above. The hole width is about 2.5 mm. 3-5 openings are distributed on the leeward side of the jet pipe, the wave pitch is about 20 mm, and the height is about 8 mm.

[0044] The above is only a preferred embodiment of the present invention, and it is not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A jet - type noise reduction device for the pantograph slider of a rail transit vehicle, characterized in that, the device includes a first jet assembly and a second jet assembly arranged in parallel, and a gas collection assembly; the first jet assembly includes a first bow - shaped jet tube (204) provided with a number of jet holes (205) and two first connecting tubes (202) arranged in mirror symmetry at the bottom of the first bow - shaped jet tube (204); the second jet assembly includes a second bow - shaped jet tube (206) provided with a number of jet holes (205) and two second connecting tubes (203) arranged in mirror symmetry at the bottom of the second bow - shaped jet tube (206); the first bow - shaped jet tube (204) and the second bow - shaped jet tube (206) are connected to the gas collection assembly through the first connecting tube (202) and the second connecting tube (203); the gas collection assembly mechanism includes a gas collection tube (201); one side of the gas collection tube (201) for collecting gas has an opening facing the running direction of the rail transit vehicle; the opening on the other side of the gas collection tube (201) is connected to the first connecting tube (202) and the second connecting tube; the first bow - shaped jet tube (204), the first connecting tube (202) and the gas collection tube (201) are in mutual communication; the second bow - shaped jet tube (206), the second connecting tube (203) and the gas collection tube (201) are in mutual communication; both the first bow - shaped jet tube (204) and the second bow - shaped jet tube (206) are installed on the leeward side of the pantograph slider; the jet holes (205) are located on the side of the first bow - shaped jet tube (204) and the second bow - shaped jet tube (206) away from the pantograph slider.

2. The jet - type noise reduction device for the pantograph slider of a rail transit vehicle according to claim 1, characterized in that, the gas collection tube (201) is of streamline design.

3. The jet - type noise reduction device for the pantograph slider of a rail transit vehicle according to claim 1, characterized in that, the first bow - shaped jet tube (204), the second bow - shaped jet tube (206), the first connecting tube (202) and the second connecting tube (203) are all rectangular tubes.

4. The jet - type noise reduction device for the pantograph slider of a rail transit vehicle according to claim 3, characterized in that, the inner wall corners of the rectangular tubes are passivated.

5. The jet - type noise reduction device for the pantograph slider of a rail transit vehicle according to claim 1, characterized in that, the jet holes (205) are arranged in one of single - straight - line arrangement, double - straight - line arrangement, up - and - down staggered arrangement or wavy arrangement.

6. The jet - type noise reduction device for the pantograph slider of a rail transit vehicle according to claim 1, characterized in that, the material of the device is one of aluminum, aluminum alloy, magnesium alloy or titanium alloy.

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