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CN-224218564-U - Cathode inner core of plasma generator with blunt body turbulent cooling structure

CN224218564UCN 224218564 UCN224218564 UCN 224218564UCN-224218564-U

Abstract

The utility model discloses a cathode inner core of a plasma generator with a blunt body turbulent flow cooling structure, belonging to the technical field of plasma generators. The cathode inner core comprises a blunt turbulent cathode head, an emitter and a cathode seat, wherein the blunt turbulent cathode head is an integrated special-shaped structure body, the blunt turbulent cathode head and the cathode seat are connected together to form a deep cup-shaped structure with a circular opening at one end and a horn opening at the other end, the length-diameter ratio of an inner hole of the cathode seat to an inner hole of the connecting end of the blunt turbulent cathode head is 5-15 times, and the emitter is embedded in the center of the inner hole of the blunt turbulent cathode head. The utility model has simple structure, small volume, low cost, convenient replacement and maintenance, high plasma temperature and reliable operation, can further reduce the working temperature of the cathode inner core, and can stably prolong the service life of the cathode inner core to more than 1200 hours.

Inventors

  • REN ZIKANG
  • JIA GANGJIAN
  • LU PEINING
  • GUO KAI
  • ZHU HONGSHENG
  • WANG QINZHI

Assignees

  • 徐州燃烧控制研究院有限公司

Dates

Publication Date
20260508
Application Date
20250324

Claims (9)

  1. 1. A cathode inner core of a plasma generator with a blunt body turbulent cooling structure is characterized by comprising a blunt body turbulent cathode head (1), an emitter (2) and a cathode seat (3), wherein the blunt body turbulent cathode head (1) is an integrated special-shaped structure, one side of the outer surface of the blunt body turbulent cathode head (1) is a cone, the other side of the cylindrical body is a cylinder, a hollow inner cylindrical opening with the diameter phi 1 is formed on the side end face of the cone of the blunt body turbulent cathode head (1), a circle of circular arc-shaped groove is formed at the bottom of the hollow inner cylindrical opening, a circle of inner protrusions surrounded by the circular arc-shaped groove are provided with a frustum blunt body with the spherical groove, a plurality of through holes with the diameter phi 2 are uniformly distributed on the circumference of the joint of the cylindrical body and the cone, a hollow inner cylindrical opening with the diameter phi 3 is formed on the end face of the side of the cylindrical body, the diameter phi 3 is larger than the diameter phi 1, a conical frustum with the top of the plane is formed on the center of the bottom of the hollow inner cylindrical opening, the emitter (2) is inlaid in a cylindrical blind hole, the diameter of the cylindrical blind hole is formed on the cylindrical opening, the diameter of the cylindrical opening is the same with the diameter of the cylindrical opening, the tubular cathode body is connected with the hollow cylindrical opening (1) at one end face of the inner end face of the tubular cathode body, the tubular turbulent cathode body is formed by connecting with the cylindrical opening (1), the length-diameter ratio of the inner hole of the cathode seat (3) and the inner hole of the connecting end of the blunt turbulent cathode head (1) is 5-15 times.
  2. 2. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the cone angle a of the cone on one side of the outer surface of the blunt body turbulent cathode head (1) is 10-70 degrees.
  3. 3. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the diameter phi 1 of the hollow inner cylindrical opening of the cone side end surface of the blunt body turbulent cathode head (1) is 12-20 mm.
  4. 4. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the distance D1 from the side end face of the cone of the blunt body turbulent cathode head (1) to the end face of the truncated cone with a top spherical groove is 3-8 mm.
  5. 5. The cathode inner core of the plasma generator with the blunt body turbulent cooling structure according to claim 1, wherein the distance D between the side end face of the cone of the blunt body turbulent cathode head (1) and the center of the through holes uniformly distributed on the circumference of the joint of the cylinder and the cone is 12-15 mm.
  6. 6. The cathode inner core of the plasma generator with the blunt body turbulent cooling structure according to claim 1, wherein the diameter phi 2 of circular through holes uniformly distributed on the circumference of the joint of the cylinder and the cone of the blunt body turbulent cathode head (1) is 1-5 mm, and the number of the circular through holes is 4-20.
  7. 7. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the radius SR of the spherical groove on the truncated cone body with the spherical groove in the hollow inner cylindrical opening of the cone side of the blunt body turbulent cathode head (1) is 2-6 mm, and the cone angle b of the truncated cone is 10-70 degrees.
  8. 8. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the height D2 of a frustum with a plane at the top of a protrusion in a cylindrical opening of a cylindrical side hollow of the blunt body turbulent cathode head (1) is 3-8 mm, and the cone angle c is 20-90 degrees.
  9. 9. The cathode core of a plasma generator with a blunt body turbulent cooling structure according to claim 1, wherein the emitter (2) is connected and fixed with the blunt body turbulent cathode head (1) in a brazing or interference fit manner, and the blunt body turbulent cathode head (1) is connected and fixed with the cathode base (3) in a welding or threaded manner.

Description

Cathode inner core of plasma generator with blunt body turbulent cooling structure Technical Field The utility model relates to the technical field of plasma generators, in particular to a cathode inner core of a plasma generator with a blunt body turbulent cooling structure, which is suitable for plasma ignition of a pulverized coal boiler. Background In the current technological field, the plasma technology is in the leading edge and the development situation is rapid. The method has the advantages of being widely penetrated into various industrial fields, for example, in the aspect of coal dust ignition, realizing more efficient combustion starting of coal dust through energy excitation of plasmas, improving energy utilization efficiency, in the aspects of hazardous waste treatment and garbage incineration, carrying out harmless and reduction treatment on harmful wastes and garbage by means of the high-temperature characteristics of the plasmas, effectively solving the problem of environmental pollution, in the field of steel cutting, utilizing the high energy density of the plasmas, realizing accurate and efficient cutting of steel, improving processing precision and production efficiency, in metal smelting, promoting metal purification and refining, improving metal performance, playing a key role in the aspects of surface spraying, nano material manufacturing and the like, and improving product quality and performance. The importance of the cathode as a core component of the plasma generator is self-evident. On one hand, the device bears severe conditions such as high temperature and high energy impact in the working process, belongs to vulnerable parts, and on the other hand, the device is a key attention object for prolonging service life and reducing cost due to the complex manufacturing process and high material cost. Under the aim of seeking for cost reduction and synergy of modern enterprises, it is important to optimize the performance of the cathode and reduce the loss cost thereof. Currently, there are some design problems of cathode core cooling structures in the prior art. In patent publication No. CN107529269a, the cooling water upstream surface of the cathode head has only one conical structure, and when the cooling water flows through the conical surface, the water flow state is relatively stable, and a turbulent flow effect is difficult to form. The turbulent flow can enhance the heat exchange coefficient between the fluid and the wall surface and improve the cooling efficiency. The cooling structure which cannot form turbulent flow effect causes unsatisfactory cooling effect, and is difficult to meet the requirement of the cathode on cooling performance under high-strength working condition, thereby influencing the overall performance and the service life of the plasma generator. Therefore, developing a cathode core structure of a plasma generator capable of forming turbulent flow effect and improving cooling efficiency has important practical significance and market demand. Disclosure of Invention The utility model aims to overcome the defects in the prior art and provide the cathode inner core of the plasma generator with the blunt body turbulent cooling structure, which has simple structure and good use effect. The technical scheme is that the cathode inner core of the plasma generator with the blunt body turbulent cooling structure comprises a blunt body turbulent cathode head, an emitter and a cathode seat, wherein the blunt body turbulent cathode head is of an integrated special-shaped structure, one side of the outer surface of the blunt body turbulent cathode head is a cone, the other side of the blunt body turbulent cathode head is a cylinder, a hollow inner cylindrical opening with the diameter phi 1 is formed in the side end face of the blunt body turbulent cathode head cone, a circle of circular arc-shaped groove is formed in the bottom of the hollow inner cylindrical opening, the circle surrounded by the circular arc-shaped groove is protruded, a frustum blunt body with the spherical groove at the top is arranged, through holes in the inner cylindrical openings of a plurality of communicating cones with the diameter phi 2 are uniformly distributed on the circumference of the joint of the cylinder and the cone, the end face of the cylinder side is provided with a hollow inner cylindrical opening with the diameter phi 3, the diameter phi 3 is larger than the diameter phi 1, the bottom of the hollow inner cylindrical opening is protruded to form a cylindrical blind hole, the emitter is inlaid in the cylindrical blind hole, the cathode seat is a circular inner hole with the diameter phi 1, and the inner diameter of the cylindrical opening is the hollow cylindrical opening, and the hollow cylindrical opening is connected with the hollow cylindrical opening (the hollow cylindrical opening is the hollow cylindrical opening with the hollow cylindrical opening end face with the diam