Magnetic field shielding structure for rail vehicles

Abstract

The present invention discloses a magnetic field shielding structure for a rail vehicle. By providing a casing having a carbon steel inner tube and an aluminum alloy outer tube, and allowing the traction power supply trunk line to pass through the inner tube, effective shielding of the low-frequency magnetic field and the high-frequency magnetic field around the traction power supply trunk line is achieved. By using a pipe plug to seal the annular inner cavity between the inner tube and the outer tube, the magnetic field shielding effect is further improved, and the pipe plug can also reduce the risk of damage to the inner tube and the outer tube. The use of a hanger enables the casing to be installed without punching, and by providing a through hole on the lower support of the hanger, the hanger also has the function of fixing the wire harness. By optimizing the structure of the hanger and allowing the inner tube to extend into the socket pipe in the junction box, etc., the magnetic field shielding effect and installation stability of the casing are improved, so that the casing can be stably and reliably installed on the rail vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a magnetic field shielding structure of a rail vehicle. Background Art

[0002] Rail vehicles typically use high-voltage, high-current electric traction technology to provide vehicle power. Electric traction technology generates large traction power, and therefore large traction current. This will generate a large low-frequency magnetic field around the traction power supply mains. The low-frequency magnetic field may have an adverse effect on passengers, especially those with implantable medical devices. Therefore, it is necessary to shield the low-frequency magnetic field.

[0003] At the same time, in order to control the traction force and speed of rail vehicles, rail vehicles are usually equipped with traction inverters, which are connected to the traction power supply trunk line. The traction inverter uses IGBT as the switching element. The switching process of the switching element will generate high-frequency interference. These high-frequency interferences will also be conducted in the traction power supply trunk line in the form of current and may be radiated. These radiations may interfere with the on-board electronic equipment and the electronic equipment near the track. Therefore, it is also necessary to shield the high-frequency magnetic field.

[0004] In view of this, how to shield the low-frequency magnetic field and the high-frequency magnetic field generated by the traction components of the rail vehicle is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a magnetic field shielding structure for a rail vehicle, wherein the rail vehicle includes a traction power supply trunk line connected to a traction inverter, and the magnetic field shielding structure includes a casing, wherein the casing includes an inner tube and an outer tube sleeved outside the inner tube, the inner tube is a carbon steel tube, and the outer tube is an aluminum alloy tube, and the traction power supply trunk line passes through the inside of the inner tube.

[0006] In one embodiment, an annular inner cavity is formed between the inner tube and the outer tube, and the sleeve includes a pipe plug made of a low-hardness material. The pipe plug includes an annular plug portion, and the annular plug portion is plugged into the end of the annular inner cavity to seal the annular inner cavity.

[0007] In one embodiment, the pipe plug further includes an annular limiting portion, which is arranged at one end of the annular plug portion and contacts the end face of the sleeve, and the outer circumference of the annular limiting portion protrudes outward from the outer circumference of the outer tube and / or the inner circumference of the annular limiting portion protrudes inward from the inner circumference of the inner tube.

[0008] In one embodiment, the magnetic field shielding structure also includes a hanger, which includes an upper hanging plate and a lower support. The upper hanging plate is fixed on the rail vehicle, and the lower support is hung below the upper hanging plate by fasteners. The outer peripheral surface of the sleeve is clamped between the upper hanging plate and the lower support.

[0009] In one embodiment, the lower support includes a base plate arranged approximately horizontally, the middle portion of the base plate bulges upward to form a support portion for supporting the sleeve, the top wall of the support portion is arranged to be a concave arc shape symmetrical about the vertical center line of the outer tube, and the top wall is in close contact with the outer peripheral surface of the sleeve.

[0010] In one embodiment, the side walls of the support portion and the top wall are an integrated thin-walled structure, the two side walls are located on both sides of the vertical center line of the outer tube, and the upper ends of the two side walls are inclined toward the vertical center line of the outer tube.

[0011] In one embodiment, the lower support also includes two side panels arranged approximately vertically, the lower ends of the two side panels are connected to the base plate, and the upper ends of the two side panels are connected to the upper hanging plate through fasteners, and the base plate and / or the side panels are provided with through holes for installing wiring harness fixing clips.

[0012] In one embodiment, the magnetic field shielding structure also includes a junction box, a socket pipe is provided inside the junction box, a through hole communicating with the socket pipe is provided on the box wall of the junction box, the upper hanging plate is fixed outside the box wall, the outer tube and the pipe plug of the sleeve are both located outside the junction box, and the inner tube of the sleeve passes through the through hole and extends into the socket pipe.

[0013] In one embodiment, the annular limiting portion of the pipe plug is clamped between the end surface of the outer tube and the box wall.

[0014] In one embodiment, a limiting flange is provided at the port of the socket pipe away from the through hole, and the limiting flange conflicts with the end face of the inner pipe.

[0015] The magnetic field shielding structure of the rail vehicle provided by the present invention realizes effective shielding of low-frequency and high-frequency magnetic fields around the traction power supply trunk line by providing a casing having a carbon steel inner tube and an aluminum alloy outer tube and allowing the traction power supply trunk line to pass through the inner tube.

[0016] The magnetic field shielding structure of the rail vehicle provided by the present invention has the technical effects of good magnetic field shielding effect, stable sleeve installation, and wire harness fixing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an embodiment of a magnetic field shielding structure for a rail vehicle provided by the present invention;

[0018] Figure 2 for Figure 1 Left view of;

[0019] Figure 3 Schematic diagram of another embodiment of the sleeve.

[0020] The following are the descriptions of the reference numerals:

[0021] 10 sleeve, 101 inner tube, 102 outer tube, 103 annular inner cavity, 104 pipe plug, 1041 annular plug portion, 1042 annular limiting portion;

[0022] 20 upper hanging plate, 201 fixed plate, 202 connecting plate;

[0023] 30 lower support, 301 bottom plate, 3011 top wall, 3012 side wall, 302 side plate, 303 through hole;

[0024] 40 junction box, 401 box wall, 4011 through hole, 402 socket pipe, 4021 limit flange. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Railway vehicles are equipped with traction power mains, which conduct traction current. The currents flowing in these mains are high, generating a large low-frequency magnetic field around them. Railway vehicles also have traction converters connected to them. The switching elements of these converters generate high-frequency interference during switching. This interference is also transmitted through the traction power mains as current, resulting in a large high-frequency magnetic field around them.

[0027] The present invention designs a magnetic field shielding structure for shielding low-frequency magnetic fields and high-frequency magnetic fields around a traction power supply trunk line to prevent the magnetic field from causing harm to passengers and surrounding electronic equipment.

[0028] like Figure 1 As shown, the magnetic field shielding structure includes a sleeve 10, which includes an inner tube 101 and an outer tube 102 sleeved outside the inner tube 101. The inner tube 101 is a carbon steel tube, and the outer tube 102 is an aluminum alloy tube. The traction power supply main line passes through the inside of the inner tube 101.

[0029] The carbon steel pipe has good magnetic permeability and can effectively shield low-frequency magnetic fields. The aluminum alloy pipe has low resistivity and can effectively shield high-frequency magnetic fields. In addition, since the body of a rail vehicle is mostly made of aluminum alloy, the aluminum alloy outer tube 102 can shield part of the carbon steel inner tube 101, reducing the risk of electrochemical corrosion caused by direct contact between the carbon steel inner tube 101 and the aluminum alloy body.

[0030] Specifically, an annular inner cavity 103 is formed between the inner tube 101 and the outer tube 102 . The sleeve 10 is further provided with a pipe plug 104 made of a low-hardness material, which may be plastic.

[0031] Pipe plug 104 includes an annular plug portion 1041, which is inserted into the end of annular inner cavity 103 to seal it. The sealed annular inner cavity 103 also shields the magnetic field, further enhancing the shielding effect. Annular plug portion 1041 not only seals annular inner cavity 103 but also supports inner tube 101 and outer tube 102.

[0032] The pipe plug 104 further includes an annular limiting portion 1042 , which is disposed at one end of the annular plug portion 1041 . The annular limiting portion 1042 abuts against the end surface of the sleeve 10 , thereby limiting the installation position of the pipe plug 104 .

[0033] The outer circumference of the annular limiting portion 1042 protrudes outward from the outer circumference of the outer tube 102 and / or the inner circumference of the annular limiting portion 1042 protrudes inward from the inner circumference of the inner tube 101. Figure 1 and Figure 3 understand. Figure 1 In the embodiment, the end face of the inner tube 101 is located outside the end face of the outer tube 102 , the outer periphery of the annular limiting portion 1042 protrudes outward from the outer periphery of the outer tube 102 , and the inner periphery of the annular limiting portion 1042 contacts the outer periphery of the inner tube 101 . Figure 3 In the embodiment, the end surface of the inner tube 101 is flush with the end surface of the outer tube 102 , the outer circumference of the annular limiting portion 1042 protrudes outward from the outer circumference of the outer tube 102 , and the inner circumference of the annular limiting portion 1042 protrudes inward from the inner circumference of the inner tube 101 .

[0034] Allowing the outer periphery of the annular limiting portion 1042 to protrude outward from the outer periphery of the outer tube 102 and / or the inner periphery of the annular limiting portion 1042 to protrude inward from the inner periphery of the inner tube 101 can protect the inner tube 101 and the outer tube 102, reduce the risk of damage to the inner tube 101 and the outer tube 102 during installation, and thus avoid the problem of poor magnetic field shielding effect due to damage to the inner tube 101 or the outer tube 102.

[0035] Further, combined Figure 1 and Figure 2As shown, the magnetic field shielding structure also includes a hanger and a junction box 40. The hanger includes an upper hanging plate 20 and a lower support 30. The upper hanging plate 20 is fixed to the box wall 401 of the junction box 40, and the lower support 30 is suspended below the upper hanging plate 20 via fasteners. The outer circumference of the casing 10 is sandwiched between the upper hanging plate 20 and the lower support 30. This installation method does not require drilling holes in the casing 10 wall, thereby preventing the risk of magnetic field leakage through the holes in the casing 10 wall, thereby ensuring the magnetic field shielding effect.

[0036] It should be noted that the junction box 40 is a common component of rail vehicles, but not all rail vehicles are equipped with a junction box 40. For some rail vehicles that are not equipped with a junction box 40 or where there is no space to install a hanger at the location of the junction box 40, the upper hanging plate 20 of the hanger can also be fixed to other components of the rail vehicle.

[0037] Figure 1 and Figure 2 In the illustrated embodiment, a spigot 402 is installed within the junction box 40. A through-hole 401 is provided in the wall 401 of the junction box 40, communicating with the spigot 402. A stop flange 4021 is provided at the end of the spigot 402, distal from the through-hole 4011. The outer tube 102 and the plug 104 of the casing 10 are both located outside the junction box 40. The inner tube 101 of the casing 10 extends through the through-hole 4011 into the spigot 402, where it abuts against the stop flange 4021. The plug 104 of the casing 10 is sandwiched between the end face of the outer tube 102 and the wall 401 of the junction box 40.

[0038] The limiting flange 4021 serves to define the axial position of the inner tube 101. The pipe plug 104, sandwiched between the end face of the outer tube 102 and the wall 401 of the junction box 40, more tightly seals the annular inner cavity 103 of the sleeve 10 and prevents it from falling out. Extending the inner tube 101 into the spigot 402 within the junction box 40 enhances magnetic field shielding and secures the installation of the sleeve 10.

[0039] Specifically, the upper hanging plate 20 includes a connecting plate 202 and fixed plates 201 arranged at both ends of the connecting plate 202. The connecting plate 202 is arranged approximately horizontally, and the fixed plate 201 is arranged approximately vertically. Figure 2 As shown, from a side view, the connecting plate 202 and the fixed plate 201 are roughly L-shaped. The fixed plate 201 is in contact with and fixed to the wall 401 of the junction box 40, specifically by welding or fasteners. The connecting plate 202 has connection holes at both ends for connecting to the lower support 30.

[0040] Specifically, the lower support 30 includes a base plate 301 arranged approximately horizontally and two side plates 302 arranged approximately vertically. The lower ends of the two side plates 302 are connected to the base plate 301, and the upper ends of the two side plates 302 are connected to the connecting holes at both ends of the connecting plate 202 through fasteners.

[0041] The middle portion of the bottom plate 301 bulges upward to form a support portion for supporting the sleeve 10 . The support portion has a top wall 3011 and two side walls 3012 .

[0042] The top wall 3011 of the support portion is configured to be symmetrically concave about the vertical center line of the outer tube 102 so that the top wall 3011 can fit in contact with the outer circumference of the sleeve 10. In this way, the sleeve 10 can be supported more firmly, making the installation of the sleeve 10 more stable.

[0043] The two side walls 3012 and top wall 3011 of the support portion are an integrated thin-walled structure. The two side walls 3012 are located on either side of the vertical centerline of the outer tube 102, and the upper ends of both side walls 3012 are inclined toward the vertical centerline. This arrangement allows the support portion to elastically deform when supporting the sleeve 10. This elastic deformation of the support portion allows the sleeve 10 to be clamped more tightly, thereby ensuring a more secure installation.

[0044] The bottom plate 301 is provided with a through hole 303 for installing a harness fixing clamp. The harness fixing clamp fixes the branch harness to the lower support 30. By providing the through hole 303 on the bottom plate 301, the lower support 30 also has the function of fixing the harness, realizing multiple uses of one object.

[0045] In general, the magnetic field shielding structure of the rail vehicle provided by the present invention mainly makes the following improvements:

[0046] (1) By providing a casing 10 having a carbon steel inner tube 101 and an aluminum alloy outer tube 102 and allowing the traction power supply trunk line to pass through the inner tube 101, effective shielding of the low-frequency magnetic field and the high-frequency magnetic field around the traction power supply trunk line is achieved;

[0047] (2) By sealing the annular inner cavity 103 between the inner tube 101 and the outer tube 102 with the pipe plug 104, the magnetic field shielding effect is further improved. In addition, the pipe plug 104 can also reduce the risk of damage to the inner tube 101 and the outer tube 102.

[0048] (3) The hanging seat is used to realize the installation of the sleeve 10 without punching holes, and by providing a through hole 303 on the lower support 30 of the hanging seat, the hanging seat also has the function of fixing the wire harness.

[0049] (4) By optimizing the structure of the hanger and allowing the inner tube 101 to extend into the socket tube 402 in the junction box 40, the magnetic field shielding effect and installation stability of the sleeve 10 are improved, so that the sleeve 10 can be stably and reliably installed on the rail vehicle.

[0050] The magnetic field shielding structure of the rail vehicle provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A magnetic field shielding structure for a rail vehicle, the rail vehicle comprising a traction power supply main connected to a traction converter, characterized in that: The magnetic field shielding structure comprises a sleeve (10), the sleeve (10) comprising an inner tube (101) and an outer tube (102) sleeved outside the inner tube (101), the inner tube (101) being a carbon steel tube, the outer tube (102) being an aluminum alloy tube, and the traction power supply main line passing through the interior of the inner tube (101); an annular inner cavity (103) is formed between the inner tube (101) and the outer tube (102); the sleeve (10) comprising a pipe plug (104) made of a low-hardness material, the pipe plug (104) comprising an annular plug portion (1041), the annular plug portion (1041) being plugged into the end of the annular inner cavity (103) to seal the annular inner cavity (103); the end face of the inner tube (101) being located outside the end face of the outer tube (102) or the end face of the inner tube (101) being flush with the end face of the outer tube (102).

2. The magnetic field shielding structure of a rail vehicle according to claim 1, characterized in that: The pipe plug (104) further includes an annular limiting portion (1042), which is arranged at one end of the annular plug portion (1041) and contacts the end face of the sleeve (10), and the outer circumference of the annular limiting portion (1042) protrudes outward from the outer circumference of the outer tube (102) and / or the inner circumference of the annular limiting portion (1042) protrudes inward from the inner circumference of the inner tube (101).

3. The magnetic field shielding structure of a rail vehicle according to claim 2, characterized in that: The magnetic field shielding structure also includes a hanger, which includes an upper hanging plate (20) and a lower support (30). The upper hanging plate (20) is fixed on the rail vehicle, and the lower support (30) is hung below the upper hanging plate (20) through a fastener. The outer peripheral surface of the sleeve (10) is clamped between the upper hanging plate (20) and the lower support (30).

4. The magnetic field shielding structure of a rail vehicle according to claim 3, characterized in that: The lower support (30) includes a horizontally arranged bottom plate (301), the middle portion of the bottom plate (301) bulges upward to form a support portion for supporting the sleeve (10), the top wall (3011) of the support portion is arranged to be a concave arc shape symmetrical about the vertical center line of the outer tube (102), and the top wall (3011) is in close contact with the outer peripheral surface of the sleeve (10).

5. The magnetic field shielding structure for a rail vehicle according to claim 4, characterized in that: The side walls (3012) on both sides of the support portion and the top wall (3011) are an integrated thin-walled structure. The two side walls (3012) are located on both sides of the vertical center line of the outer tube (102), and the upper ends of the two side walls (3012) are inclined toward the vertical center line of the outer tube (102).

6. The magnetic field shielding structure for a rail vehicle according to claim 4, characterized in that: The lower support (30) further comprises two side panels (302) arranged vertically, the lower ends of the two side panels (302) being connected to the base panel (301), the upper ends of the two side panels (302) being connected to the upper hanging panel (20) via fasteners, and the base panel (301) and / or the side panels (302) being provided with through holes (303) for mounting a wiring harness fixing clip.

7. The magnetic field shielding structure for a rail vehicle according to claim 3, characterized in that: The magnetic field shielding structure also includes a junction box (40), a socket pipe (402) is provided inside the junction box (40), a through hole (4011) communicating with the socket pipe (402) is provided on the box wall (401) of the junction box (40), the upper hanging plate (20) is fixed outside the box wall (401), the outer tube (102) and the pipe plug (104) of the sleeve (10) are both located outside the junction box (40), and the inner tube (101) of the sleeve (10) passes through the through hole (4011) and extends into the socket pipe (402).

8. The magnetic field shielding structure for a rail vehicle according to claim 7, characterized in that: The annular limiting portion (1042) of the pipe plug (104) is clamped between the end surface of the outer tube (102) and the box wall (401).

9. The magnetic field shielding structure for a rail vehicle according to claim 8, characterized in that: A limiting flange (4021) is provided at the port of the bell pipe (402) away from the through hole (4011), and the limiting flange (4021) is in conflict with the end face of the inner pipe (101).

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