CN113644805B

CN113644805B - Superconducting magnetic suspension railway and traction coil and coreless traction coil inner frame thereof

Info

Publication number: CN113644805B
Application number: CN202110925796.1A
Authority: CN
Inventors: 张雅芝; 周黎民; 何云风; 裴亚伟; 张欣伟
Original assignee: CRRC Zhuzhou Electric Co Ltd
Current assignee: CRRC Zhuzhou Electric Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2023-04-14
Anticipated expiration: 2041-08-12
Also published as: CN113644805A

Abstract

The invention discloses a superconducting magnetic suspension railway and a traction coil and an inner frame of a coreless traction coil thereof; the inner frame of the coreless traction coil is a stressed structure of a coil main body, is made of glass fiber composite materials, and has the advantages of high strength, strong heat resistance, simple manufacturing process, low manufacturing cost and low requirement on the precision of a track mounting surface. The coreless traction coil inner frame comprises: the inner frame body is used for winding a conductor, and the metal bushing is embedded into the inner frame body, and the inner frame body is provided with a fixing structure matched with a lead of the conductor. In the scheme, the inner frame body can provide support for winding the lead of the traction coil, so that the lead can be wound more simply and more accurately; and the tight contact between every circle of conducting wire of the wound conductor can be fixed through the fixing structure of the inner frame body.

Description

Superconducting magnetic suspension railway and traction coil and coreless traction coil inner frame thereof

Technical Field

The invention relates to the technical field of superconducting magnetic suspension systems, in particular to a superconducting magnetic suspension railway and a traction coil and an inner frame of a coreless traction coil thereof.

Background

The superconducting magnetic suspension system is driven by a long stator synchronous linear motor, a motor rotor is a superconducting coil, long stator traction coils are laid on two sides of a circuit, and the long stator traction coils and the superconducting coil jointly act to provide traction force for a suspension vehicle. The traction coil is a key component in a superconducting magnetic suspension traction system, needs to be laid on a whole line, is large in quantity, and has great influence on the construction and running cost of magnetic suspension.

The existing traction coil is formed by integrally compressing or pouring and injecting resin on the surface of a conductor, and in addition, a metal lining is embedded for improving the partial strength of the fastening part of a coil bolt; however, the existing traction coil has the following defects:

1. the traction coil has no independent winding support structure, the winding difficulty of the lead is high, the precision is low, and the conductors are difficult to fix;

2. the flange on the end face of the metal bushing of the traction coil is circular, so that the allowance of bearing the bolt tightening torque is low;

3. when resin is compressed or poured or injection molded, a pin, a reinforcing pad or other devices are needed to fix the position of the conductor in the mold, and the molding process is complex;

4. the main structure material is thermoplastic resin material, and has low strength and poor heat resistance.

Disclosure of Invention

In view of the above, the invention provides an inner frame of a coreless traction coil, which is a stressed structure of a coil main body, is made of a glass fiber composite material, and has the advantages of high strength, strong heat resistance, simple manufacturing process, low manufacturing cost and low requirement on the precision of a track mounting surface. According to the scheme, the inner frame body can provide support for winding the lead of the traction coil, so that the lead can be wound more simply and more accurately; and the tight contact between every circle of conducting wire of the wound conductor can be fixed through the fixing structure of the inner frame body.

The invention provides a traction coil using the coreless traction coil inner frame.

The invention provides a superconducting magnetic suspension railway applying the traction coil.

In order to achieve the purpose, the invention provides the following technical scheme:

an inner frame for a coreless traction coil, comprising: the inner frame body is used for winding the conductor and is provided with a fixing structure matched with a lead of the conductor.

Preferably, the fixing structure comprises:

set up in the inside casing body for pass the ligature area in order to fix the ligature hole or the ligature groove of wire.

Preferably, the inner frame body is made of glass fiber resin matrix composite materials through a compression molding process.

Preferably, the method further comprises the following steps: and the bushing is embedded in the inner frame body.

Preferably, the bush peripheral wall is provided with a flange;

the flange of one end of the bushing is of a polygonal structure, the flange of the other end of the bushing is of a circular structure, and the diameter of the circular structure is 0-2 mm smaller than that of an inscribed circle formed by the polygonal structure.

Preferably, one end of the bushing protrudes from the surface of the inner frame body close to the rail.

A traction coil comprising a conductor, further comprising: the coreless traction coil inner frame is described above;

the traction coil further includes: an inner terminal and an outer terminal;

the conductor is wound on the inner frame body; the inner terminal is connected to the innermost turn of the conductor; the outer terminal is connected to the outermost turn of the conductor.

Preferably, the method further comprises the following steps: the coil casting body is arranged on the surface of the conductor;

the edge of the surface of the inner frame body is provided with a step for lapping the end part of the coil casting body.

Preferably, a wire leading mechanism is further included; the first end of the lead wire mechanism is connected with the innermost turn of the lead wire of the conductor, and the second end of the lead wire mechanism is connected with the inner terminal;

the end face of the inner frame body is provided with a placing groove used for being matched with the first end of the lead mechanism.

A superconducting magnetic levitation railway, comprising: the traction device comprises a track and long stator traction coils laid on two sides of the track, wherein the long stator traction coils are the traction coils;

the traction coil includes: an upper layer traction coil and a lower layer traction coil;

the upper-layer traction coils and the lower-layer traction coils are sequentially and alternately laid on each side of the track, and each upper-layer traction coil is stacked between two adjacent lower-layer traction coils.

Preferably, a lower layer positioning and mounting structure matched with the rail is arranged between the rail and each lower layer traction coil;

the lower floor location mounting structure includes:

two positioning bosses arranged on the track;

the lower layer positioning groove is communicated with the inner frame body of the lower layer traction coil and is used for being matched with the lower parts of the two positioning bosses of the track;

a matched upper layer positioning and mounting structure is arranged between the track and each upper layer traction coil; the upper positioning and mounting structure comprises:

the upper parts of two adjacent positioning bosses corresponding to the two lower-layer traction coils adjacent to the upper-layer traction coil;

the inner frame body is communicated with the upper layer traction coil and is used for matching with the upper positioning grooves of the two adjacent positioning bosses.

According to the technical scheme, the iron-core-free traction coil inner frame provided by the invention can provide support for winding of a traction coil wire through the inner frame body, so that the wire can be wound more simply and more accurately; and the tight contact between every circle of conducting wire of the wound conductor can be fixed through the fixing structure of the inner frame body.

The invention also provides a traction coil, which has corresponding beneficial effects due to the adoption of the coreless traction coil inner frame, and specific reference can be made to the previous description, so that the description is not repeated.

The invention also provides a superconducting magnetic suspension railway, which has corresponding beneficial effects due to the adoption of the traction coil, and specific reference can be made to the foregoing description, so that the description is omitted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an inner frame of a coreless traction coil provided in an embodiment of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;

fig. 3 is a schematic structural view of an inner frame body according to an embodiment of the present invention;

fig. 4 is a structural top view of an inner frame body according to an embodiment of the present invention;

FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4;

FIG. 6 is a schematic diagram of a process arrangement of an inner frame SMC material of a coreless traction coil provided by an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an inner frame of a coreless traction coil according to another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a traction coil provided in an embodiment of the present invention;

FIG. 9 isbase:Sub>A cross-sectional view A-A of FIG. 8;

FIG. 10 is a schematic structural view (with lashing holes) of a traction coil provided in an embodiment of the present invention;

FIG. 11 is a schematic structural view of a traction coil (with a lashing slot) provided in an embodiment of the present invention;

FIG. 12 is a schematic ground layout of a traction coil provided in accordance with an embodiment of the present invention;

FIG. 13 is a schematic view of an installation of a pull coil provided by an embodiment of the present invention;

fig. 14 is a schematic structural diagram of an upper layer traction coil provided in an embodiment of the present invention;

FIG. 15 is a schematic view of a lower traction coil according to an embodiment of the present invention;

fig. 16 is a schematic diagram of connection between a coreless traction coil and a track according to an embodiment of the present invention.

Wherein, 1 is a bush, 1a is a convex part, and 1b is a through hole; 2, an inner frame body, 2a, 2b, 2c, 2d, 2e, 2f, 2h, 2i and 2i are round corners, groove shapes, steps, binding holes, binding grooves, lower-layer positioning grooves, placing grooves and upper-layer positioning grooves; 3 is a binding band; 4, a coil casting body, 4a, a groove structure and 4b, a casting boss; 5 is a conductor; 6 is a wrap angle; 7 is an inner terminal, and 7a is a groove structure; 8 is an outer terminal; 9 is a lead mechanism; 10 is a traction coil, 10a is an upper layer traction coil, 10a.1 is a coil boss, 10b is an upper layer traction coil, 10b.1 is a coil sinking platform, 10U is a U-phase traction coil, 10V is a V-phase traction coil, and 10W is a W-phase traction coil; 11 is a track, 11a is a positioning boss, and 11b is a track boss; 12 is a suspension guide coil; 13a is an upper V-phase cable, 13b is a middle W-phase cable, and 13c is a lower U-phase cable; 14 is a fastening bolt; SMC sheet (15).

Detailed Description

Aiming at the problems of the existing traction coil, the invention discloses an inner frame structure for winding and conductor support, which has the advantages of simple manufacturing process, high strength, low manufacturing cost and low requirement on the precision of a track mounting surface.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1, an inner frame of a coreless traction coil provided in an embodiment of the present invention includes: the inner frame body 2 is used for winding a conductor 5 (the structure of which is shown in fig. 9), and the inner frame body 2 is provided with a fixing structure used for being matched with a lead of the conductor 5.

In the present scheme, it should be noted that, as shown in fig. 1, the conducting wire of the conductor 5 is wound around the circumferential end surface of the inner frame body 2, and the inner frame body 2 provides support for winding the conducting wire of the conductor 5, so that the winding of the conducting wire is simpler and has high precision; in addition, the fixing structure of the inner frame body 2 is adopted, so that the conductor 5 can be fixed after being wound.

According to the technical scheme, in the coreless traction coil inner frame provided by the embodiment of the invention, the support can be provided for the winding of the lead of the traction coil through the inner frame body, so that the winding of the lead is simpler and the precision is higher; and the tight contact between every circle of conducting wire of the wound conductor can be fixed through the fixing structure of the inner frame body.

In this scheme, fixed knot constructs including:

and a binding hole 2d (as shown in fig. 7) or a binding groove 2e for passing through the binding band 3 to fix the wire is provided in the inner frame body 2. As shown in fig. 11, the binding grooves 2e are distributed on the inner end surface of the inner frame body 2 (the inner frame body 2 is a hollow structure) far from the conductor 5. Specifically, as shown in fig. 10 or fig. 11, the scheme passes through the binding holes 2d or the binding grooves 2e through the binding tapes 3, so that the turns of the conducting wires of the conductors 5 are bound with the inner frame body 2, and the scheme has the characteristics of simple structure, convenience and firmness in fixation and the like. Of course, the fixing structure of the inner frame body 2 can be at any position on each edge of the inner frame body 2, and the shape, size and number of the slots on the inner frame body 2 can be adjusted according to the binding requirement.

Specifically, in order to reduce the eddy current loss of the traction coil, the scheme uses a non-magnetic and non-conductive non-metallic material as a raw material of the inner frame body 2, and in order to reduce the production cost and improve the yield, the scheme is required to adopt a relatively simple manufacturing process to produce the inner frame body 2; preferably, the inner frame body 2 is made of a glass fiber resin-based composite material through a compression molding process. The design of the scheme has the characteristics of simple manufacturing process, high strength, strong heat resistance, low cost, high yield and the like. Of course, the inner frame body 2 in the present scheme may also adopt other production modes. For example, the inner frame body 2 may also adopt a molding manner of processing a laminate, that is, the inner frame body 2 adopts a molding process of the laminate, then an insert hole (i.e., an inner insert hole) of the embedded bushing 1 is processed, then the insert hole and the outer circle of the bushing are tapped, and finally the bushing 1 and the inner frame body 2 are fixed in a manner of screw thread and glue joint.

Further, in order to improve the overall strength of the inner frame body 2 and to enhance the structural strength of the bolt fastening part of the traction coil; correspondingly, as shown in fig. 1, an inner frame of a coreless traction coil provided in an embodiment of the present invention further includes: and a bush 1 embedded in the inner frame body 2.

Still further, as shown in fig. 3, the outer peripheral wall of the bush 1 is provided with a flange for increasing the contact strength with the inner frame body 2;

the flange at one end of the bushing 1 is of a polygonal structure, and the flange at the other end of the bushing is of a circular structure; as shown in fig. 3, the flange at one end of the bushing 1 is preferably hexagonal, so that one end of the bushing 1 has a certain torque resistance, which helps to increase the margin of the bushing to bear the bolt tightening torque, and further, the bushing 1 is not easy to loosen. In addition, in order to facilitate the quick installation of the bushing 1, the flange of the bushing 1 is designed to be a structure with one large end and the other small end; accordingly, as shown in fig. 4 and 5, the diameter of the circular structure is 0 to 2mm smaller than the diameter of the inscribed circle formed by the polygonal structure. Of course, as shown in fig. 1, the inner frame body 2 is provided with an inner embedding hole for matching with the bushing 1, one end of the inner embedding hole is a large end and is an circumscribed circle structure capable of accommodating the hexagonal flange of the bushing 1, and the other end of the inner embedding hole is a small end and is an inscribed circle structure with a diameter matching the diameter of the circular flange of the bushing 1.

In order to further optimize the above technical solution, as shown in fig. 2, one end of the bush 1 protrudes from the surface of the inner frame body 2 close to the rail 5, so that the contact of the traction coil and the rail installation surface is completed by the protruding portion 1a of the bush 1, which can help to reduce the manufacturing accuracy of the traction coil and the rail installation surface. Of course, in order to achieve smooth installation of the traction coil, it is required that the number of the bushings 1 is plural and distributed at the corners of the inner frame body 2 in a one-to-one correspondence. Specifically, as shown in fig. 1, in the present solution, the number of the bushings 1 is four, and the bushings are distributed at four sinking platforms of the inner frame body 2 in a one-to-one correspondence manner.

An embodiment of the present invention further provides a traction coil, as shown in fig. 8, including a conductor 5 (as shown in fig. 9), further including: the coreless traction coil inner frame is described above;

and the traction coil further comprises: a coil casting body 4, an inner terminal 7 and an outer terminal 8;

the conductor 5 is wound on the inner frame body 2; the inner terminal 7 is connected to the innermost turn of the conductor 5; the outer terminal 8 is connected to the outermost turn of the conductor 5; the coil casting body 4 is coated on the surface of the conductor 5. Because this scheme has adopted foretell no iron core traction coil inside casing, it also has corresponding beneficial effect, can refer to the preceding explanation specifically, and the no longer repeated description herein. In addition, the conductor 5 is wound on the inner frame body 2, and the inner frame body 2 is used as a support for the conductor 5 during winding, so that the difficulty in winding the large-section conductor 5 can be reduced, the conductor 5 is easy to wind and high in precision, the traction coil can have enough mechanical strength, the coil can be positioned based on the inner frame during casting, and the difficulty in the casting process is reduced; in addition, the inner terminal 7 and the outer terminal 8 are used as the terminals of the traction coil, are connected with the terminals of the traction coil through cables, and generate electromagnetic force which interacts with a superconducting coil on the vehicle after three-phase alternating current is introduced, so that the vehicle is pushed to run. In addition, the scheme adopts the coil casting body 4 so as to realize the electrical insulation of the traction coil, thereby ensuring the weather resistance and the protective performance of the traction coil.

Preferably, the material of the coil molded body 4 is mainly composed of an epoxy resin, and further includes a curing agent, a fine silica powder, and the like. The epoxy resin has the characteristics of high temperature resistance, small thickness, difficult cracking under high and low temperature impact, good molding manufacturability and the like; in addition, the coil can be positioned based on the inner frame body 2 during pouring, and the difficulty of the pouring process can be reduced.

As shown in fig. 9, the edge of the surface of the inner frame body 2 is provided with a step 2c for overlapping the end of the coil cast body 4; wherein, this step 2c is all equipped with at inside casing body 2 upper and lower surface edge. This scheme is so designed, the pouring of the coil pouring body 4 of not only being convenient for, but also has helped promoting the fastening nature of the pouring of the coil pouring body 4 pouring. In addition, this scheme can use the terminal surface of inside casing body 2 as the locating surface of traction coil at casting die when conductor 5 surface casting coil casting body 4, can make conductor 5 casting positioning accuracy higher. In addition, regardless of the designed distribution of the positions of the binding holes 2d or the binding grooves 2e, the coil molded body 4 is extended toward the above-described binding structure.

In particular, in order to achieve a good connection of the innermost turn of the wire of the conductor 5 with the inner terminal 7; the traction coil provided by the embodiment of the invention also comprises a lead mechanism 9; the first end of the lead mechanism 9 is connected with the innermost turn of the lead of the conductor 5, and the second end is connected with the inner terminal 7;

the end face of the inner frame body 2 is provided with a placing groove 2h matched with the first end of the lead mechanism 9. The scheme is that a notch is reserved on the end face of the inner frame body 2 and used for placing the first end of the lead mechanism 9, smooth connection between the first end of the lead mechanism 9 and the innermost turn lead of the conductor 5 can be ensured, and the scheme has the characteristics of compact structure, reasonable structural distribution and the like. Of course, in order to ensure the flatness of the coil cast body 4, the lead mechanism 9 in this embodiment is preferably a U-shaped plate, as shown in fig. 9; wherein the U-shaped plate is fitted upside down to the conductor 5 and one bent portion thereof is welded to the innermost turn of the wire of the conductor 5 and the other bent portion is welded to the inner terminal 7.

Further, as shown in fig. 8, the traction coil provided in the embodiment of the present invention further includes:

and the wrap angle 6 is used for filling the layer changing gap between the innermost turn of the conductor 5 and the adjacent turn of the conductor. Namely, the wrap angle 6 is used for filling a layer changing gap between a first turn of conducting wire and a second turn of conducting wire when the conductor 5 is wound so as to prevent the conductor 5 from having a wedge-shaped air gap between the head end of the first turn of conducting wire and the second turn of conducting wire and avoid the position from being easily deformed in the winding, transportation and subsequent processes.

An embodiment of the present invention further provides a superconducting magnetic levitation railway, as shown in fig. 12, including: the track 11 and long stator traction coils laid on two sides of the track 11, wherein the long stator traction coils are the traction coils;

as shown in fig. 12, the traction coil includes: an upper layer traction coil 10a and a lower layer traction coil 10b;

a plurality of upper layer traction coils 10a and a plurality of lower layer traction coils 10b are sequentially and alternately laid on each side of the track 11, and each upper layer traction coil 10a is stacked between two adjacent lower layer traction coils 10b. Because this scheme has adopted foretell traction coil, it also has corresponding beneficial effect, can refer to the preceding explanation specifically, and no longer repeated here. In addition, traction coil 10 in this scheme is bilayer structure, and the dislocation distributes, and this scheme so designs and has following beneficial effect:

(1) As shown in fig. 12, the adjacent lower, upper and lower three traction coils are a U-phase traction coil 10U, a V-phase traction coil 10V and a W-phase traction coil 10W, respectively, each single-phase traction coil is simple to wind, each coil is connected to a three-phase cable, and is arranged in an upper, middle and lower three layers in the gravity direction (vertical direction), that is, an upper V-phase cable 13a, a middle W-phase cable 13b and a lower U-phase cable 13c, respectively; the upper layer traction coil and the lower layer traction coil are alternately distributed, so that the cable arrangement can be staggered, and the cable arrangement difficulty is reduced;

(2) The scheme adopts a double-layer traction coil and staggered installation structure, and can adopt larger ampere turns within the same polar distance to provide larger traction force compared with a single-layer tiled coil; in addition, a more uniform three-phase alternating magnetic field of the rail ground can be realized, and the excitation to the superconducting coil is reduced, so that the vibration to the superconducting coil is reduced, and the vehicle body can run more smoothly;

(3) As shown in fig. 12, the upper and lower traction coils share a set of bolt fasteners and rail mounting screw holes, so that the number of fasteners is reduced, and the traction coils are more convenient to mount and overhaul;

(4) The upper layer traction coil and the lower layer traction coil are alternately arranged, so that a larger heat dissipation space is formed between the traction coils, and the heat dissipation performance of the coils is better;

(5) The traction coil 10 is of a hollow structure, and the upper and lower layers of traction coils are installed in a staggered manner to provide space on the track 11 so as to design a track boss 11b; the rail boss 11b is used for mounting the levitation guide coil 12.

In the scheme, as shown in fig. 12, a matched lower layer positioning and mounting structure is arranged between the track 11 and each lower layer traction coil 10b;

lower floor's location mounting structure includes:

two positioning bosses 11a provided on the rail 11, the structure of which can be seen in fig. 13;

a lower positioning groove 2f penetrating the inner frame body 2 provided on the lower traction coil 10b and adapted to be engaged with the lower portions of the two positioning bosses 11a of the rail 11, the structure of which is shown in fig. 15; namely, the matching of the positioning boss and the positioning groove is beneficial to realizing the quick installation of the lower traction coil 10b, and the device also has the characteristics of simple structure, convenient disassembly and assembly and the like;

a matched upper layer positioning and mounting structure is arranged between the track 11 and each upper layer traction coil 10 a; the upper positioning and mounting structure comprises:

the upper parts of two adjacent positioning bosses 11a corresponding to two lower traction coils 10b adjacent to the upper traction coil 10a can be seen in fig. 12;

an upper positioning groove 2i penetrating the inner frame body 2 provided in the upper traction coil 10a and engaging with the upper portions of the two adjacent positioning bosses 11a is configured as shown in fig. 14. Similarly, the upper layer traction coil 10a and the lower layer traction coil 10b are matched through the same structure, so that the rapid installation of the upper layer traction coil 10a is realized, and the upper layer traction coil 10a and the lower layer traction coil 10b share the positioning boss 11a, so that the utilization rate of the positioning installation structure is improved, and the installation structure of the traction coil on the track 11 is facilitated to be simplified. This scheme is so designed for traction coil's mounting means is simple, has improved the installation accuracy. Of course, as shown in fig. 12, the hollow structure of the traction coil and the staggered installation of the upper and lower layers of traction coils can provide a spatially designed rail boss 11b on the rail 11, and the rail boss 11b is used for installing the levitation guide coil 12. As shown in fig. 16, the upper-layer traction coil 10a is fitted into a coil sinking platform 10b.1 of the lower-layer traction coil 10b through a coil boss 10a.1, and then mounted on the rail 11 through the same set of fastening bolts 14, wherein the fastening bolts 14 pass through the bushings 1 of the upper-layer traction coil 10a and the lower-layer traction coil 10b at the same time, and are finally mounted into the mounting holes of the rail 11.

The scheme is further described by combining the specific embodiment as follows:

the technical problems solved by the invention are as follows:

1. the support is provided for winding the lead of the coreless traction coil, the stress generated when the thick-section aluminum lead is wound can be borne, and the size of an interface with a track is ensured;

2. the device provides fixed support for the installation of the coreless traction coil on the track, and can fix the conductor on the track and bear the working load of the traction coil;

3. in order to reduce eddy current loss, non-magnetic and non-conductive non-metallic materials are used as raw materials of the inner frame, and the eddy current loss is reduced under the condition of meeting the use strength.

The technical scheme of the invention is elaborated in detail:

the inner frame body 2 of the traction coil is made by adopting an SMC (sheet molding compound) mould pressing process, the used material is a glass fiber resin matrix composite material, and the inner frame body 2 is used as a main body stress structure, has high strength and strong heat resistance and can endure the temperature in the coil manufacturing process; in order to adapt to a boss on a track, the interior of the boss is designed to be hollow, and the corners of the boss are designed to be round-corner structures 2a, wherein the round-corner structures 2a are R20-R35, so that stress concentration during mould pressing is reduced; in addition, groove type 2b with the depth of 1-3 mm is arranged on four sides of the inner frame body 2, a groove type (namely a placing groove) with the depth of 3-7 mm is additionally reserved on one long side of the inner frame body and is used for placing a lead device (namely a lead mechanism 9), and a step 2c with the height of 4-8 mm is arranged on the periphery of the inner frame body 2 and is used for casting a subsequent coil; in addition, bushings 1 made of stainless steel materials are embedded in four sinking platforms of the inner frame body 2.

The bush 1 of the inner frame body 2 is provided with a flange structure for increasing the contact strength between the bush and the inner frame body 2; through-hole 1b is reserved in the middle of bush 1 for the fastening bolt assembly, except the pore wall of through-hole 1b, other faces increase the contact strength with inside casing body 2 through sandblast or other surface treatment modes that increase surface roughness. In addition, the end flange of the bushing 1 is in a hexagonal structure and has certain torque resistance. All edges of the flange at the end part of the bushing 1 need to be rounded at R0.5-R2, so that stress concentration is prevented during mould pressing and subsequent use.

In the SMC die pressing process, the SMC sheet laying scheme is as shown in figure 6, materials at the position of the bushing 1 are arranged around the bushing 1, meanwhile, the sheet at the fillet transition position is ensured to be continuous, the welding condition is avoided, and the welding microcrack at the fillet transition position during die pressing can be avoided.

The key points and points to be protected of the invention are as follows:

1. the inner frame is made by adopting an SMC (sheet molding compound) mould pressing process, the used material is a glass fiber resin matrix composite material, the resin material is thermosetting resin materials such as epoxy resin, unsaturated polyester, phenolic resin, modified resin and the like, and the wire is used as a support when being wound.

2. The inside casing has flange structure in the middle of the bush that inlays, and the tip flange is the hexagon structure, and each edge of bush tip flange all needs the fillet of falling R0.5 ~ R2.

3. The inner frame base body (namely the inner frame body) is provided with groove types with the depth of 1-3 mm on four sides.

4. The inner frame is additionally provided with a groove with the depth of 3-7 mm on one long side and used for placing a lead device.

5. The inner frame of the traction coil ensures that the sheets at the fillet transition position are continuous in the SMC die pressing process, so that the occurrence of micro-crack in die pressing forming is avoided.

The invention has the advantages that:

(1) The inner frame structure can be used for drawing a coil, firstly, an aluminum conductor is wound on an inner frame (namely an inner frame body 2), the conductors can be bound and fixed by a binding belt through the slotting position of the inner frame, and the conductors are easy to wind and high in precision;

(2) The inner frame is of a main body stress structure, is made of glass fiber resin matrix composite materials through compression molding, and is embedded with the metal bushing, so that the integral strength is high, the manufacturing process is simple, the cost is low, and the yield is high;

(3) When epoxy resin is poured on the surface of the conductor, the end face of the inner frame is used as a positioning face of the coil on a pouring mold, and the positioning precision of the conductor is high;

(4) The flange at the end part of the coil metal bushing is of a hexagonal structure, so that the coil metal bushing has certain torque resistance and is not easy to loosen;

(5) The bottom surface of the bushing protrudes out of the surface of the inner frame composite material, so that the contact with the track surface is ensured to be completed by the bushing, and the manufacturing precision of the coil and the track mounting surface can be reduced.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A traction coil comprising a conductor (5), characterized by further comprising: an ironless traction coil inner frame, the ironless traction coil inner frame comprising: the end face of the circumference of the inner frame body (2) is used for winding a conductor (5), the inner frame body (2) is of a hollow structure, and the inner frame body (2) is provided with a fixing structure which is used for being matched with a lead of the conductor (5);

the fixing structure includes:

the binding holes (2 d) or the binding grooves (2 e) are arranged on the inner frame body (2) and are used for penetrating through the binding belts (3) to fix the wires;

the coreless traction coil inner frame further comprises: a bushing (1) embedded in the inner frame body (2);

the peripheral wall of the bushing (1) is provided with a flange;

the flange at one end of the bushing (1) is of a polygonal structure, the flange at the other end of the bushing is of a circular structure, and the diameter of the circular structure is 0-2 mm smaller than that of an inscribed circle formed by the polygonal structure;

the traction coil further includes: a coil casting body (4), an inner terminal (7) and an outer terminal (8);

the conductor (5) is wound on the circumferential end face of the inner frame body (2); the inner terminal (7) is connected to the innermost turn of the conductor (5); the outer terminal (8) is connected to the outermost turn of the lead of the conductor (5); the coil casting body (4) is coated on the surface of the conductor (5);

the traction coil further comprises a lead mechanism (9); the first end of the lead wire mechanism (9) is connected with the innermost turn of the conductor (5), and the second end of the lead wire mechanism is connected with the inner terminal (7);

a placing groove (2 h) matched with the first end of the lead mechanism (9) is formed in the end face of the inner frame body (2);

the lead mechanism (9) is a U-shaped plate, the U-shaped plate is inversely arranged on the conductor (5), one bent part of the U-shaped plate is welded to the innermost turn of the conductor (5), and the other bent part of the U-shaped plate is welded to the inner terminal (7).

2. Traction coil according to claim 1, characterized in that the inner frame body (2) surface edge is provided with a step (2 c) for overlapping the coil cast body (4) end.

3. Traction coil according to claim 1, wherein the inner frame body (2) is made of a glass fiber resin based composite material by a compression moulding process.

4. The traction coil according to claim 1, wherein one end of the bushing (1) protrudes from the surface of the inner frame body (2) close to the track.

5. A superconducting magnetic levitation railway comprising: the track (11) and long stator traction coils laid on two sides of the track (11), wherein the long stator traction coils are the traction coils according to any one of claims 1 to 4;

the traction coil includes: an upper layer traction coil (10 a) and a lower layer traction coil (10 b);

the plurality of upper-layer traction coils (10 a) and the plurality of lower-layer traction coils (10 b) are sequentially and alternately laid on each side of the track (11), and each upper-layer traction coil (10 a) is stacked between two adjacent lower-layer traction coils (10 b).

6. A superconducting magnetic levitation railway as claimed in claim 5, wherein there is a cooperating lower positioning mounting structure between the track (11) and each lower traction coil (10 b);

lower floor's location mounting structure includes:

two positioning bosses (11 a) arranged on the track (11);

the lower layer positioning groove (2 f) penetrates through the inner frame body (2) arranged on the lower layer traction coil (10 b) and is used for being matched with the lower parts of the two positioning bosses (11 a) of the track (11);

a matched upper layer positioning and mounting structure is arranged between the track (11) and each upper layer traction coil (10 a); the upper positioning and mounting structure comprises:

the upper parts of two adjacent positioning bosses (11 a) corresponding to two lower-layer traction coils (10 b) adjacent to the upper-layer traction coil (10 a);

the inner frame body (2) is arranged on the upper layer traction coil (10 a) in a penetrating way and is used for matching with the upper positioning grooves (2 i) of the upper layers of the two adjacent positioning bosses (11 a).