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CN-122000182-A - Non-adhesive conical high-voltage pulse transformer secondary coil and preparation method thereof

CN122000182ACN 122000182 ACN122000182 ACN 122000182ACN-122000182-A

Abstract

The invention discloses a glue-free conical high-voltage pulse transformer secondary coil and a preparation method thereof, which solve the technical problems that the secondary coil is easy to discharge and poor in operation stability due to the fact that solidified glue is adopted in the traditional conical high-voltage pulse transformer secondary coil, wherein the secondary coil only consists of a paper base cylinder and a coil winding layer, the structure is simpler, the winding process is more convenient, the uncertainty caused by human factors is reduced, the coil winding layer and a miniature spiral groove are mutually embedded, the accurate arrangement, uniformity and stability of electromagnetic wires are realized, no gelation is realized, and the electric field non-uniformity and a closed air gap possibly caused by introducing resin glue are avoided.

Inventors

  • WANG GANG
  • ZENG BO
  • HUANG HONGYANG
  • Shi Dingyuan
  • LIU YAO
  • XUE HONGTAO
  • LIU SHENG
  • PAN YAFENG

Assignees

  • 西北核技术研究所

Dates

Publication Date
20260508
Application Date
20260130

Claims (7)

  1. 1. The non-glue type conical high-voltage pulse transformer secondary coil is characterized by comprising a paper base cylinder (1) and a coil winding layer (2) which are coaxially arranged; the paper base cylinder (1) is of a paper cone-shaped structure prepared by adopting a wet integral molding process; The miniature spiral groove (3) has been seted up to the outer wall of paper base section of thick bamboo (1), coil winding layer (2) adopts the electromagnetic wire coiling to form, and the electromagnetic wire corresponds in embedding miniature spiral groove (3).
  2. 2. The secondary coil of the non-adhesive conical high-voltage pulse transformer according to claim 1, wherein the section of the miniature spiral groove (3) is trapezoidal, the width from the groove bottom to the groove opening is gradually contracted, and the depth is not smaller than the diameter of an electromagnetic wire of the coil winding layer (2).
  3. 3. The secondary coil of the non-adhesive conical high-voltage pulse transformer according to claim 1, wherein the section of the miniature spiral groove (3) is rectangular, and the depth is not smaller than the diameter of an electromagnetic wire of the coil winding layer (2).
  4. 4. A method for manufacturing a secondary coil of a non-adhesive conical high-voltage pulse transformer according to any one of claims 1-3, comprising the steps of: S1, manufacturing a vacuum mold according to the size of a required paper base cylinder (1), covering the surface of the vacuum mold by using a nylon net, uniformly applying the cut wet paper blank on the surface of the vacuum mold for a plurality of times, and sequentially compacting, vacuumizing, drying and trimming to take down the paper base cylinder (1); s2, adopting a numerical control lathe, selecting a groove width and a corresponding cutter head according to the diameter of an electromagnetic wire, and engraving a miniature spiral groove (3) on the conical surface of the paper base cylinder (1); S3, fixing the electromagnetic wire at one end of the paper base cylinder (1) according to the actual winding direction requirement of the high-voltage pulse transformer, and forcefully pulling the electromagnetic wire to enable the electromagnetic wire to be gradually pressed into the miniature spiral groove (3) until reaching the other end of the paper base cylinder (1), so as to obtain the coil winding layer (2).
  5. 5. The method for preparing the secondary coil of the non-adhesive conical high-voltage pulse transformer according to claim 4, wherein the step S1 is specifically as follows: s1.1, manufacturing a vacuum mold according to the size of a required paper base cylinder (1), and covering the surface of the vacuum mold by using a nylon net; S1.2, uniformly applying the cut wet paper blank on the surface of a vacuum die for a plurality of times, compacting by using an elastic band after each application, vacuumizing, and maintaining for 20-24 hours to enable the paper cylinder to be formed preliminarily; s1.3, placing the preliminarily formed paper tube and a die in a drying box together, setting the temperature to be 120-125 ℃, drying for 46-48 hours, taking out, compacting again by using an elastic band, placing in the drying box, continuously drying for 48 hours, taking out, trimming, finishing and surface polishing, and taking down the paper base tube (1).
  6. 6. The preparation method of the secondary coil of the non-adhesive conical high-voltage pulse transformer according to claim 4 or 5 is characterized in that in S1, the length and the outer diameter of the vacuum mold are the same as the length and the inner diameter of a required paper base cylinder (1), and the material is aluminum; One end of the vacuum mold is sealed, the other end of the vacuum mold is provided with a vacuumizing interface, the vacuumizing interface is used for connecting vacuumizing equipment, and the side wall of the vacuum mold is uniformly provided with a plurality of ventilation holes for vacuumizing the inner surface of the wet paper blank.
  7. 7. The method for manufacturing the secondary coil of the non-adhesive conical high-voltage pulse transformer is characterized in that S3 is characterized in that one end of a paper base tube (1) is coaxially and fixedly connected to an output shaft of a rotating device, an electromagnetic wire is fixed at one end of the paper base tube (1) according to the actual winding direction requirement of the high-voltage pulse transformer, the rotating device is started, the paper base tube (1) rotates around a central axis, the electromagnetic wire is pulled forcefully, and the electromagnetic wire is pressed into a miniature spiral groove (3) gradually until the other end of the paper base tube (1) is reached, and a coil winding layer (2) is obtained.

Description

Non-adhesive conical high-voltage pulse transformer secondary coil and preparation method thereof Technical Field The invention relates to a secondary coil and a preparation method thereof, in particular to a non-adhesive conical high-voltage pulse transformer secondary coil and a preparation method thereof. Background The Tesla transformer type pulse power driving source is widely applied in the field of high-power microwaves and is mainly characterized in that the Tesla transformer and a pulse forming wire are integrally constructed, namely, primary coils and secondary coils of the Tesla transformer are embedded between inner and outer open-circuit magnetic cores in the coaxial pulse forming wire. The primary capacitor stores energy through coupling resonance of primary and secondary coils of a Tesla transformer, is stored in a pulse forming line in an electric field mode, and is compressed through a gas switch to output high-power electric pulses. However, when the Tesla transformer charges the pulse forming wire, the voltage at two ends of the secondary coil is gradually increased, if a certain point is discharged to cause breakdown, the electromagnetic wire of the coil wire is cut off in a short time, and the transformer cannot work normally. The secondary coil is widely used because the cone coil has two structures, namely cone and column, and the cone coil does not influence the formation of line impedance distribution. The common cone-shaped secondary coil consists of an electrical paper board, a wire electromagnetic wire and a curing adhesive, wherein the surface of the paper board is coated with the adhesive, and the wire electromagnetic wire and the paper board are bonded together after curing. In the cone-shaped secondary coil winding process, after the surface of the paper board is covered by the adhesive layer, a closed air gap is easy to form. Experimental research shows that the electric field in the air gap in the adhesive layer is obviously enhanced, and the air discharge is most likely to occur in the air gap, so that small-scale explosion is formed, and the multi-turn wire electromagnetic wire is outwards protruded and even broken. In addition, the dielectric constant of the cured paste is not consistent with that of transformer oil. The introduction of the curing adhesive can cause local distortion of an electric field near the electromagnetic wire of the secondary coil due to non-uniform dielectric constants of the transformer oil and the curing adhesive, so that the electromagnetic wire of the wire at the local point location is more easy to generate turn-to-turn discharge. Therefore, in order to ensure the operation reliability of the secondary coil, the generation of a closed air gap and non-uniformity of dielectric constant is required to be avoided. On the other hand, the coil vibrates under a strong pulse current during operation. Under the action of long-term vibration, the electromagnetic wire of the wire can fall off and displace to reduce the inter-turn insulation distance, thereby triggering inter-turn discharge. Therefore, in order to ensure the long-term operation stability of the coil, the uniformity and stability of the arrangement of the electromagnetic wires of the wires in the coil are required to be ensured. Disclosure of Invention The invention aims to solve the technical problems that the secondary coil of the traditional conical high-voltage pulse transformer adopts solidified glue to cause easy discharge among electromagnetic wires and further cause poor operation stability of the secondary coil, and provides a glue-free conical high-voltage pulse transformer secondary coil and a preparation method thereof. In order to achieve the above purpose, the technical solution provided by the present invention is: the non-glue type conical high-voltage pulse transformer secondary coil is characterized by comprising a paper base cylinder and a coil winding layer which are coaxially arranged; The paper base cylinder is of a paper cone-shaped structure prepared by adopting a wet integral molding process; The outer wall of the paper base cylinder is provided with a miniature spiral groove, the coil winding layer is formed by winding electromagnetic wires, and the electromagnetic wires are correspondingly embedded into the miniature spiral groove. Further, the section of the miniature spiral groove is trapezoid, the width from the groove bottom to the groove opening is gradually contracted, and the depth is not smaller than the diameter of the electromagnetic wire of the coil winding layer. Further, the section of the miniature spiral groove is rectangular, and the depth is not smaller than the diameter of the electromagnetic wire of the coil winding layer. The preparation method of the secondary coil of the non-adhesive conical high-voltage pulse transformer is characterized by comprising the following steps of: S1, manufacturing a vacuum mold according to the size of a requi