CN113375546B - Limiter probe system suitable for magnetic restraint devices - Google Patents
Limiter probe system suitable for magnetic restraint devices Download PDFInfo
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- CN113375546B CN113375546B CN202110635894.1A CN202110635894A CN113375546B CN 113375546 B CN113375546 B CN 113375546B CN 202110635894 A CN202110635894 A CN 202110635894A CN 113375546 B CN113375546 B CN 113375546B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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Abstract
The invention discloses a limiter probe system suitable for a magnetic restraint device, which comprises a heat sink base plate, graphite tiles and a probe assembly. The heat sink base plate is processed by chromium zirconium copper, and two water-cooling pipelines are arranged in the heat sink base plate. The graphite tile is made of high-density graphite and has high heat conductivity. The probe assembly consists of a graphite probe head, a ceramic shell, a copper connecting bolt, a fixing nut, a copper binding post, a spring washer, a locking nut and a wire, and is arranged in a probe hole in a graphite tile and a heat sink substrate. The probe assembly is connected in a threaded or wire pressing clamp crimping manner, so that the probe assembly has the advantages of being firm and stable mechanically and can work in a high-temperature environment. The probe adopts the ceramic shell as a matrix, and the internal components are in non-contact with the heat sink substrate, so that the insulation performance of the probe system is ensured. The invention adopts a modularized structure, can be integrally disassembled and assembled, and is easy to maintain. The restrictor probe array of the present invention provides a direct means for measuring the three-dimensional structure of the boundary plasma.
Description
Technical Field
The invention relates to the field of magnetic confinement plasma diagnosis, in particular to a limiter probe system suitable for a magnetic confinement device.
Background
The magnetic confinement plasma is characterized in that a magnetic field with a special form is utilized to confine quasi-neutral plasma in a specific space, and the magnetic confinement plasma is mainly applied to the field of magnetic confinement fusion and comprises a tokamak, a star simulator, a magnetic mirror, a pinch and other fusion devices. Fusion energy is a clean energy source and is a main way for solving the problem of human energy in the future. The interaction of the boundary plasma of a magneto-restrictive fusion device with the first wall material in the vacuum chamber is an important subject of fusion research, because fusion products and a part of high-temperature plasma need to be discharged from the confinement region, and can bring about high thermal load on the first wall material, and possibly cause material damage. In advanced configurations of tokamak and star simulators, boundary plasmas may exhibit three-dimensional structural features and are linked to core or boundary plasma instabilities. Measuring plasma parameters at the boundaries of magnetically confined fusion devices and their three-dimensional structural features is important for understanding and controlling the behavior of magnetically confined plasmas.
The limiter is a common component in magnetic confinement fusion devices, and can limit the configuration of plasma on one hand and protect other vacuum chamber components behind the limiter on the other hand. Generally, the limiter has a wider span in the polar direction, and the Langmuir probe array arranged along the polar direction can measure the three-dimensional structural characteristics of the boundary plasma.
Langmuir probes can measure electron temperature, electron density, ion saturation current and suspension potential of the plasma, and their fluctuations. Currently, the magnetic confinement fusion device such as a mid-plane rapid reciprocating probe and a divertor Langmuir probe array mounted on a divertor target plate are widely used, and provide extremely important information for boundary physical research. Patent CN108040415B proposes an integrated modular probe system suitable for tungsten copper target plates, which is detachable as a whole, has good insulation, and has more reliable and stable performance compared with the prior divertor probe system. Accordingly, the present absorption adopted the design scheme of patent CN108040415B for the divertor langmuir probe as a technical reference for the design of limiter probe.
Disclosure of Invention
The invention aims to provide a limiter probe system suitable for a magnetic confinement fusion device so as to realize measurement of boundary plasma parameters and three-dimensional structures.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a limiter probe system suitable for a magnetic confinement device, comprising a heat sink base plate 9, a graphite tile 10 and a probe assembly; the limiter probe system is characterized in that a plurality of arrays are symmetrically distributed in the circumferential direction, and each circumferential array is provided with a plurality of probes along the surface of the limiter in the polar direction; the graphite tile 10 and the heat sink base plate 9 are provided with probe holes, after the probe assembly is assembled, the probe assembly is inserted from the rear end of the heat sink base plate 9 and is fixed by a spring washer 7 and a locking nut 8; the graphite probe head 1 of the probe is flush with the inclined surface of the graphite tile 10; the graphite tile 10, the probe holes on the graphite tile 10 and the edges of the probe head 1 are all rounded.
In one embodiment of the present invention, the contact surface between the graphite tile 10 and the plasma is divided into three surfaces, the foremost plane is parallel to the heat sink substrate 9, and the structures such as the heat sink substrate 9 at the rear are protected; the side surface of the graphite tile 10 is vertical to the front end plane, so that the internal structure of the limiter is protected from being struck by plasma; an inclined plane which is angled with the front plane is arranged between the front plane and the side surface, so that plasma incident along magnetic force lines forms an angle with the inclined plane, and a high heat load area is avoided; a groove parallel to the front end plane is formed in the graphite tile 10 corresponding to the rear of the front end plane and is used for placing a graphite fixing block 11; a through hole is arranged between the groove and the bottom of the graphite tile 10; the graphite tile 10 is connected with the heat sink substrate 9 through a graphite fixing block 11 and a screw, wherein the graphite fixing block 11 is formed by processing 316L stainless steel, is provided with a threaded hole and is connected with the heat sink substrate 9 through the screw; a through hole is formed at the joint of the inclined plane and the plane of the graphite tile 10, and is completely positioned in the inclined plane, and the graphite probe head 1 extends out from the through hole; the edges of the probe holes on the graphite tile 10 are rounded; the joint of the three surfaces of the graphite tile 10 and other edges of the surfaces are rounded; the size of the graphite fixing block 11 is smaller than that of the groove of the graphite tile 10, and the position of the graphite tile 10 can be finely adjusted in the installation process, so that the graphite probe head 1 can be positioned at the center of a probe hole; after the graphite tile 10 is finished, a silicon carbide coating is received to enhance the abrasion and ablation resistance of the surface of the graphite tile 10.
In one embodiment of the invention, the heat sink base plate 9 is made of chromium zirconium copper, and is internally provided with two circular water pipe channels along the polar direction for cooling the graphite tile 10 and the probe assembly; one end of each of the two water pipes is connected by a U-shaped copper pipe, and the connection part is welded by induction; the other ends of the two water pipes are respectively connected with the stainless steel water inlet pipe and the stainless steel water outlet pipe in a brazing way; a through hole is formed at the joint of the heat sink base plate 9 and the graphite tile 10, and the graphite tile 10 is fixed on the heat sink base plate 9 through a screw; a step hole is correspondingly formed in the heat sink base plate 9 at the rear of the inclined plane of the graphite tile 10, namely at the position of a probe hole of the graphite tile 10, and the aperture of a through hole at the front end is smaller than that of a through hole at the rear end; the rear end through hole is divided into two parts, the hole of the front part is unthreaded, the aperture of the rear part is larger than that of the front part and is a threaded hole; after the probe assembly is assembled, the probe assembly is inserted from the rear end of the stepped hole and then is screwed and fixed by using a spring washer 7 and a locking nut 8.
In one embodiment of the invention, the probe assembly comprises a graphite probe head 1, a copper connecting bolt 2, a ceramic housing 3, a fixing nut 4, a copper post 5, a spring washer 7, a lock nut 8 and a wire 6; after the graphite probe head 1, the copper connecting bolt 2, the ceramic shell 3, the fixing nut 4, the copper binding post 5 and the lead 6 are assembled, the whole body is inserted from the rear of the stepped hole of the chromium-zirconium-copper heat sink substrate 9, and then the graphite probe head is fixed by the spring washer 7 and the locking nut 8.
In one embodiment of the invention, the graphite probe head 1 is processed by graphite and is cylindrical, the top is processed into an inclined plane, the inclined plane is flush with the inclined plane of the graphite tile 10 after being installed, and the edge of the graphite probe head 1 is rounded; the rear half part of the graphite probe head 1 is provided with internal threads and is used for being connected with a copper connecting bolt 2; the bottom of the graphite probe head 1 has a larger cylindrical diameter than the rest of the graphite probe head 1, and is flattened symmetrically on both sides to the cylindrical surface of the rest of the graphite probe head 1 so as to mount or dismount the graphite probe head 1 using a jig.
In one embodiment of the invention, the copper connecting bolt 2 is divided into a front section, a middle section and a rear section, the front section is cylindrical and is provided with external threads, and the front section is connected with the graphite probe head 1; four sides of the middle section cylinder are flattened and used for screwing and fixing the copper connecting bolt 2, the fixing nut 4 and the ceramic shell 3 when the probe is assembled; the rear section cylinder is an external thread, and after the copper connecting bolt 2 is inserted into the ceramic shell 3 from front to back and is screwed with the fixing nut 4, the copper connecting bolt 2 is fixed on the ceramic shell 3; and the inside of the rear section cylinder is provided with internal threads for connecting with the copper binding post 5.
In one embodiment of the invention, the outer surface of the fixing nut 4 is quadrilateral, and is matched with the quadrilateral hole in the rear section cylinder of the ceramic shell 3 in size, and after the fixing nut 4 is placed into the quadrilateral hole of the ceramic shell 3, the fixing nut is limited in position so as not to rotate; the inside of the fixing nut 4 is provided with an internal thread which is matched with the external thread of the rear section of the copper connecting bolt 2, and after the fixing nut 4 is put into the quadrilateral hole of the ceramic shell 3, the copper connecting bolt 2, the ceramic shell 3 and the fixing nut 4 can be fixed by rotating and screwing the middle section nut of the copper connecting bolt 2.
In one embodiment of the invention, the copper binding post 5 is a cylinder, and is divided into a front section and a rear section, the front section cylinder is provided with external threads and is matched with the internal threads of the rear section of the copper connecting bolt 2, and the diameter of the front section cylinder is smaller than that of the rear section cylinder; the inside blind hole that opens of back end cylinder, after the sinle silk of wire 6 inserts the blind hole, compress tightly through the line ball pincers, can connect copper terminal 5 and wire 6.
In one embodiment of the invention, the wire 6 is a fire-resistant wire, the center is a nickel-plated copper wire conductor, and the periphery is sequentially wrapped with glass fiber, a fire-resistant mica tape and a glass fiber sintered layer from inside to outside.
In one embodiment of the invention, the ceramic shell 3 is a high temperature sintered ceramic suitable as a substrate for a probe. The ceramic shell 3 is in the shape of two sections of cylinders, the diameter of the front section of cylinder is larger than that of the rear section of cylinder, and the length of the front section of cylinder is shorter than that of the rear section of cylinder; the inside of the front section cylinder of the ceramic shell 3 is provided with a through hole, the aperture is larger than the outer diameter of the rear section of the copper connecting bolt 2 and smaller than the outer diameter of the middle section nut; a quadrilateral hole is formed in the rear section cylinder of the ceramic shell 3 and is used for placing and fixing the fixing nut 4; when the probe is installed, the front section cylinder of the ceramic shell 3 is inserted into the step hole of the chromium zirconium copper heat sink substrate 9 from the rear; the rear end cylinder and the threaded hole of the step hole are spaced, a spring washer 7 and a lock nut 8 are sequentially placed in the rear end cylinder and the threaded hole of the step hole, and the lock nut 8 is screwed down, so that the positions of the ceramic shell 3 and the probe assembly can be fixed.
In one embodiment of the invention, the surface of the lock nut 8 is an external thread, which corresponds to a threaded hole in the stepped hole of the chromium-zirconium-copper heat sink substrate 9; the lock nut 8 is internally provided with a through hole, and the inner diameter of the through hole is larger than the outer diameter of the rear section cylinder of the ceramic shell 3; two grooves are symmetrically formed at the bottom of the lock nut 8 so that the lock nut 8 can be tightened or loosened by using a tool.
The invention has the beneficial effects that:
the invention provides a limiter probe system suitable for a magnetic restraint device, which adopts an integrated modularized structure, integrates a probe assembly on a limiter and can realize integral disassembly and assembly. The probe system has the advantages that the water-cooling pipeline is arranged in the chromium-zirconium-copper heat sink substrate, and heat deposited on the graphite tile and the probe in the discharging process can be taken away, so that the probe system has the capacity of working under the steady-state long-pulse discharging condition. The probe assemblies are connected in a threaded or wire pressing clamp crimping mode, a welding-free mode is adopted, stable work can be achieved under the high-temperature condition, a certain part is convenient to detach or replace in the maintenance process, and the probe assemblies are convenient to replace integrally. In addition, the probe assembly is integrally installed in a reserved hole of the limiter after being assembled, and the assembly precision of the probe, the heat sink and the graphite tile can be ensured by combining the fine adjustment of the position of the graphite tile at the front end, so that the measurement precision and the reliability are improved. The graphite probe head and the graphite tile are made of high-density graphite materials, have similar material characteristics, can keep synchronous change of the surface of the probe head and the surface of the graphite tile under the bombardment of plasma, and ensure the reliability of measured data. According to the requirements of the magnetic confinement fusion device, the graphite tile and the graphite probe head can be replaced by metal materials, such as a tungsten sheet and a tungsten probe head respectively. The limiter probe is arranged at the forefront end of the inclined plane of the graphite tile, so that the information of boundary plasma can be measured, meanwhile, the characteristic that the plasma is mainly incident along the magnetic force line at a small angle is utilized to reduce the direct bombardment of the plasma on the graphite tile and the probe, the service life of a probe system is prolonged, and the system can operate under the high-performance steady-state long-pulse discharge condition. The size of a single limiter probe is small, the space utilization rate is high, a plurality of probe arrays can be installed on the limiter, and the direct measurement of boundary plasma parameters and polar and circumferential dissymmetry of the boundary plasma parameters is realized, so that the method is an important and effective means for boundary three-dimensional physical research. In addition, the limiter probe array can select the required working modes including single probe, suspension potential, saturated ion flow, three probes and other working modes according to experimental requirements through optimal combination, so that the flexibility of a probe system is improved.
Drawings
FIG. 1 is a front side view of a restrictor probe;
FIG. 2 is a cross-sectional view of the stopper probe in a horizontal plane;
FIG. 3 is a right side cross-sectional view of the restrictor probe;
wherein: the graphite probe comprises a graphite probe head 1, a copper connecting bolt 2, a ceramic shell 3, a fixing nut 4, a copper binding post 5, a lead 6, a spring washer 7, a locking nut 8, a heat sink substrate 9, a graphite tile 10 and a graphite fixing block 11.
Detailed Description
The technical solutions of 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, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without the inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
The restrictor probe system of the present invention suitable for use in a magnetic confinement device comprises a heat sink base plate 9, graphite tiles 10 and a probe assembly. As shown in FIG. 1, the limiter probe of the invention has two symmetrical annular arrays, each annular array is positioned at the forefront end of the inclined plane of the graphite tile 10 at two sides of the limiter, each annular array has 26 probes, the two annular arrays are closely distributed along the polar direction, and plasma information from two sides is measured respectively, so that the limiter probe has higher spatial resolution. Each graphite probe head 1 is flush with the inclined plane of the graphite tile 10, and the edge is provided with a round angle. The probe aperture edges of the graphite tiles 10 are also rounded. The edges of the graphite tile 10, as well as the junctions of the front flat, beveled and side surfaces, are rounded. The graphite tile 10 is made of highly dense graphite, and has high heat conductivity and high hardness.
The graphite tile 10 is made of high-density graphite, and has high heat conduction performance and high hardness. The contact surface of the graphite tile 10 and the plasma is divided into three surfaces, the forefront plane is parallel to the heat sink substrate 9, and the structures of the heat sink substrate 9 and the like at the rear are protected; the side surface of the graphite tile 10 is vertical to the front end plane, so that the internal structure of the limiter is protected from being struck by plasma; between the front plane and the side surface, a bevel is formed at a small angle with the front plane, so that plasma incident along the magnetic force lines forms a small angle with the bevel, and a high heat load area is avoided. A groove parallel to the front plane is formed in the graphite tile 10 corresponding to the rear of the front plane for placing the graphite fixing block 11. A through hole is provided between the recess and the bottom of the graphite tile 10. The graphite tile 10 is connected with the heat sink base plate 9 through a graphite fixing block 11 and screws, wherein the graphite fixing block 11 is formed by processing 316L stainless steel, is provided with threaded holes, and is connected with the heat sink base plate 9 through screws. At the junction of the inclined plane and the plane of the graphite tile 10, a through hole is opened, and the through hole is completely positioned in the inclined plane, from which the graphite probe head 1 protrudes. The probe hole edges on the graphite tile 10 are rounded. The joint of the three surfaces of the graphite tile 10 and other edges of the surfaces are rounded. The size of the graphite fixing block 11 is slightly smaller than the size of the graphite tile groove, and the position of the graphite tile 10 can be finely adjusted in the installation process, so that the graphite probe head 1 can be positioned at the center of the probe hole. After the graphite tile 10 is finished, a silicon carbide coating will be accepted to enhance the wear and erosion resistance of the graphite tile 10 surface.
As shown in fig. 2, the graphite tile 10 and the chromium-zirconium-copper heat sink base plate 9 are connected and fixed through a graphite fixing block 11 and screws. A step hole is correspondingly formed in the rear of the inclined plane of the graphite tile 10, namely the position of a probe hole of the graphite tile 10, and a through hole with a smaller aperture is formed at the front end of the chromium zirconium copper heat sink substrate 9; the rear end has larger aperture and is divided into two parts, the hole of the front part is unthreaded, and the hole of the rear part is slightly larger and is a threaded hole.
The heat sink base plate 9 is made of chromium zirconium copper, and is internally provided with two circular water pipe channels along the polar direction for cooling the graphite tile 10 and the probe assembly. One end of each of the two water pipes is connected by a U-shaped copper pipe, and the connection part is welded by induction; the other ends of the two water pipes are respectively connected with the stainless steel water inlet pipe and the stainless steel water outlet pipe in a brazing way. The joint of the heat sink base plate 9 and the graphite tile 10 is provided with a through hole, and the graphite tile 10 is fixed on the heat sink base plate 9 through screws. A step hole is correspondingly formed in the heat sink base plate 9 at the rear of the inclined plane of the graphite tile 10, namely at the position of a probe hole of the graphite tile 10, and a through hole with a smaller aperture is formed at the front end of the heat sink base plate; the rear end has larger aperture and is divided into two parts, the hole of the front part is unthreaded, and the hole of the rear part is slightly larger and is a threaded hole. After the probe assembly is assembled, the probe assembly is inserted from the rear end of the stepped hole and then is screwed and fixed by using a spring washer 7 and a locking nut 8.
As shown in fig. 2 and 3, the probe assembly of the present invention is composed of a graphite probe head 1, a copper connection bolt 2, a ceramic housing 3, a fixing nut 4, a copper post 5, a wire 6, a spring washer 7 and a lock nut 8. After the graphite probe head 1, the copper connecting bolt 2, the ceramic shell 3, the fixing nut 4, the copper binding post 5 and the lead 6 are assembled, the whole body is inserted from the rear of the stepped hole of the chromium-zirconium-copper heat sink substrate 9, and then the graphite probe head is fixed by the spring washer 7 and the locking nut 8.
The graphite probe head 1 is formed by processing high-density graphite, is cylindrical, is processed into an inclined plane at the top, is flush with the inclined plane of the graphite tile 10 after being installed, and is subjected to fillet treatment at the edge of the graphite probe head 1. The graphite probe head 1 is cylindrical, the top is flush with the inclined plane of the graphite tile 10, and the edge is provided with a round angle. The rear half part of the graphite probe head 1 is provided with internal threads for connecting with a copper connecting bolt 2. The bottom cylinder diameter of the graphite probe head 1 is slightly larger than the rest of the graphite probe head 1, and both sides are symmetrically flattened to the cylinder surface of the rest of the graphite probe head 1 so as to mount or dismount the graphite probe head 1 using a special fixture.
The copper connecting bolt 2 is divided into three sections, namely a front section, a middle section and a rear section, the front section is cylindrical and is provided with external threads, and is connected with the graphite probe head 1 to fix the graphite probe head 1 on the probe assembly. Four sides of the middle section cylinder of the copper connecting bolt 2 are flattened into a nut shape, and the copper connecting bolt 2, the fixing nut 4 and the ceramic shell 3 are used for screwing and fixing when the probe is assembled. The outer part of the rear section cylinder is provided with external threads, and after the copper connecting bolt 2 is inserted into the ceramic shell 3 from front to back and is screwed with the fixing nut 4, the copper connecting bolt 2 is fixed on the ceramic shell 3. The rear section cylinder of the copper connecting bolt 2 is internally provided with an internal thread for being connected with a copper binding post 5.
The outer surface of the fixing nut 4 is quadrilateral, and is matched with the quadrilateral hole in the rear section cylinder of the ceramic shell 3 in size, and after the fixing nut 4 is placed into the quadrilateral hole of the ceramic shell 3, the position is limited so that the fixing nut cannot rotate. The fixing nut 4 is internally provided with an internal thread which is matched with the external thread of the rear section of the copper connecting bolt 2, and after the fixing nut 4 is put into the quadrilateral hole of the ceramic shell 3, the copper connecting bolt 2, the ceramic shell 3 and the fixing nut 4 can be fixed by rotating and screwing the middle section nut of the copper connecting bolt 2.
The ceramic shell 3 is in the shape of two sections of cylinders, the diameter of the front section of cylinder is slightly larger, but the length of the front section of cylinder is shorter, a through hole is formed in the front section of cylinder, and the rear section of external thread of the copper connecting bolt 2 is inserted from the small hole; the rear section cylinder diameter is slightly little, but length is longer, and open inside has the quadrangle hole, with the size cooperation of fixation nut 4, after fixation nut 4 put into this quadrangle hole, thereby fixation nut 4 position is restricted and can not rotate, fixes copper connecting bolt 2 on ceramic shell 3 through the middle section nut of tightening copper connecting bolt 2. The ceramic shell 3 is a high temperature sintered ceramic, has high hardness and strength, and is suitable for being used as a base body of a probe. The inner part of the front section cylinder of the ceramic shell 3 is provided with a through hole, the aperture is larger than the outer diameter of the rear section of the copper connecting bolt 2 and smaller than the outer diameter of the middle section nut. When the probe is installed, the front section cylinder of the ceramic shell 3 is inserted into the step hole of the chromium zirconium copper heat sink substrate 9 from the rear; the rear end cylinder and the threaded hole of the step hole are spaced, a spring washer 7 and a lock nut 8 are sequentially placed in the rear end cylinder and the threaded hole of the step hole, and the lock nut 8 is screwed down, so that the positions of the ceramic shell 3 and the probe assembly can be fixed.
The copper binding post 5 is divided into a front section cylinder and a rear section cylinder, the diameter of the front section cylinder is slightly smaller, external threads are distributed on the front section cylinder, and the front section cylinder is matched with the internal threads of the rear section of the copper connecting bolt 2; the diameter of the rear section cylinder is slightly larger, a blind hole is formed in the rear section cylinder, and after the wire core of the lead 6 is inserted into the blind hole, the lead is tightly pressed through a wire pressing clamp, so that the connection between the copper binding post 5 and the lead 6 is completed.
The wire 6 is fire-resistant wire, the center is nickel-plated copper wire conductor, and the periphery is sequentially wrapped with glass fiber, fire-resistant mica tape and glass fiber sintered layer from inside to outside.
The surface of the lock nut 8 is an external thread, and corresponds to a threaded hole in the stepped hole of the chromium zirconium copper heat sink substrate 9. The lock nut 8 is internally provided with a through hole, and the inner diameter of the through hole is slightly larger than the outer diameter of the rear section cylinder of the ceramic shell 3. Two grooves are symmetrically formed at the bottom of the lock nut 8 so as to screw or unscrew the lock nut 8 by using a special tool.
The specific installation process of the limiter probe system is divided into two stages, wherein the first stage is the assembly of a probe assembly, and the assembly can be completed in a laboratory; the second stage is to mount the probe assembly to the limiter, which can be done in situ in the magnetically confined fusion device. The assembly process of the first stage probe assembly is as follows: placing a fixing nut 4 into a quadrilateral hole at the rear section of the ceramic shell 3; then the copper connecting bolt 2 is inserted into the through hole of the ceramic shell 3 from front to back, the middle nut of the copper connecting bolt 2 is rotated to be connected with the fixing nut 4, and the copper connecting bolt 2 is screwed to be fixed with the ceramic shell 3; inserting a wire core of the lead 6 into a blind hole at the rear end of the copper binding post 5, pressing the rear section of the copper binding post by using a wire pressing clamp, crimping the lead 6 and the copper binding post 5, screwing external threads at the front section of the copper binding post 5 into a threaded hole at the rear end of the copper connecting bolt 2, and screwing; the inner thread of the graphite probe head 1 is butted with the outer thread of the front section of the copper connecting bolt 2 and is screwed, so that the assembly of the probe assembly is completed. In the second stage, the probe assembly is mounted to the limiter as follows: inserting the assembled probe assembly into the stepped hole of the chromium-zirconium-copper heat sink substrate 9, adjusting the angle of the probe assembly to enable the top of the graphite probe head 1 to be flush with the inclined surface of the graphite tile 10, sequentially placing the spring washer 7 and the lock nut 8, screwing the lock nut 8 by a special tool, and preventing the lock nut 8 from loosening by utilizing the resilience force of the spring washer 7; the position of the graphite tile 10 is adjusted, so that the graphite probe head 1 is positioned at the center of a probe hole of the graphite tile 10, and the connecting screw of the graphite fixing block 11 is screwed down to fix the positions of the graphite tile 10 and the chromium-zirconium-copper heat sink substrate 9. To this end, the installation of the limiter probe is completed.
Parts of the invention not described in detail are well known in the art.
While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (9)
1. Limiter probe system suitable for magnetic restraint devices, characterized in that: comprises a heat sink base plate (9), a graphite tile (10) and a probe assembly; the limiter probe system is characterized in that a plurality of arrays are symmetrically distributed in the circumferential direction, and each circumferential array is provided with a plurality of probes along the surface of the limiter in the polar direction; the graphite tile (10) and the heat sink base plate (9) are provided with probe holes, and after the probe assembly is assembled, the probe assembly is inserted from the rear end of the heat sink base plate (9) and is fixed by a spring washer (7) and a locking nut (8); the graphite probe head (1) of the probe is flush with the inclined surface of the graphite tile (10); the graphite tile (10), a probe hole on the graphite tile (10) and the edge of the graphite probe head (1) are subjected to round corner treatment;
the contact surface of the graphite tile (10) and the plasma is divided into three surfaces, and the plane at the forefront end is parallel to the heat sink substrate (9) to protect the structure of the heat sink substrate (9) at the rear; the side surface of the graphite tile (10) is vertical to the front end plane, so that the internal structure of the limiter is protected from being struck by plasma; an inclined plane which is angled with the front plane is arranged between the front plane and the side surface, so that plasma incident along magnetic force lines forms an angle with the inclined plane, and a high heat load area is avoided; a groove parallel to the front end plane is formed in the graphite tile (10) corresponding to the rear of the front end plane and is used for placing a graphite fixing block (11); a through hole is formed between the groove and the bottom of the graphite tile (10); the graphite tile (10) is connected with the heat sink substrate (9) through a graphite fixing block (11) and a screw, wherein the graphite fixing block (11) is formed by processing 316L stainless steel, is provided with a threaded hole and is connected with the heat sink substrate (9) through the screw; a through hole is formed at the joint of the inclined plane and the plane of the graphite tile (10), and is completely positioned in the inclined plane, and the graphite probe head (1) extends out from the through hole; the edges of the probe holes on the graphite tiles (10) are subjected to fillet treatment; the joint of the three surfaces of the graphite tile (10) and other edges of the surfaces are rounded; the size of the graphite fixing block (11) is smaller than that of the groove of the graphite tile (10), and the position of the graphite tile (10) can be finely adjusted in the installation process, so that the graphite probe head (1) can be positioned at the center of a probe hole; after the graphite tile (10) is processed, a silicon carbide coating is received, so that the abrasion resistance and the ablation resistance of the surface of the graphite tile (10) are enhanced.
2. A restrictor probe system adapted for use in a magnetic restriction device according to claim 1, wherein: the heat sink substrate (9) is formed by processing chromium zirconium copper, and is internally provided with two circular water pipe channels along the polar direction for cooling the graphite tile (10) and the probe assembly; one end of each of the two water pipes is connected by a U-shaped copper pipe, and the connection part is welded by induction; the other ends of the two water pipes are respectively connected with the stainless steel water inlet pipe and the stainless steel water outlet pipe in a brazing way; a through hole is formed at the joint of the heat sink base plate (9) and the graphite tile (10), and the graphite tile (10) is fixed on the heat sink base plate (9) through a screw; a step hole is correspondingly formed in the heat sink substrate (9) at the rear of the inclined plane of the graphite tile (10), namely at the position of a probe hole of the graphite tile (10), and the aperture of a front through hole is smaller than that of a rear through hole; the rear end through hole is divided into two parts, the hole of the front part is unthreaded, the aperture of the rear part is larger than that of the front part and is a threaded hole; after the probe assembly is assembled, the probe assembly is inserted from the rear end of the stepped hole and then is screwed and fixed by a spring washer (7) and a locking nut (8).
3. A restrictor probe system adapted for use in a magnetic restriction device according to claim 2, wherein: the probe assembly comprises a graphite probe head (1), a copper connecting bolt (2), a ceramic shell (3), a fixing nut (4), a copper binding post (5), a spring washer (7), a locking nut (8) and a lead (6); after the graphite probe head (1), the copper connecting bolt (2), the ceramic shell (3), the fixing nut (4), the copper binding post (5) and the lead (6) are assembled, the graphite probe head is integrally inserted from the rear of the stepped hole of the chromium-zirconium-copper heat sink substrate (9), and then the graphite probe head is fixed by the spring washer (7) and the locking nut (8).
4. A restrictor probe system adapted for use in a magnetic restriction device according to claim 3, wherein: the graphite probe head (1) is processed by graphite and is cylindrical, the top of the graphite probe head is processed into an inclined plane, the inclined plane is flush with the inclined plane of the graphite tile (10) after the graphite probe head is installed, and the edge of the graphite probe head (1) is subjected to fillet treatment; the rear half part of the graphite probe head (1) is provided with internal threads and is used for being connected with a copper connecting bolt (2); the diameter of the cylinder at the bottom of the graphite probe head (1) is larger than that of the rest part of the graphite probe head (1), and the two sides of the cylinder are symmetrically flattened to the cylindrical surface of the rest part of the graphite probe head (1) so as to use a clamp to install or detach the graphite probe head (1).
5. The restrictor probe system adapted for use in a magnetic restriction device according to claim 4, wherein: the copper connecting bolt (2) is divided into a front section, a middle section and a rear section, the front section is cylindrical and is provided with external threads, and the front section is connected with the graphite probe head (1); four edges of the middle section cylinder are flattened, and are used for screwing and fixing the copper connecting bolt (2), the fixing nut (4) and the ceramic shell (3) when the probe is assembled; the rear section cylinder is an external thread, and after the copper connecting bolt (2) is inserted into the ceramic shell (3) from front to back and is screwed with the fixing nut (4), the copper connecting bolt (2) is fixed on the ceramic shell (3); and the inner part of the rear section cylinder is provided with an internal thread for connecting a copper binding post (5).
6. The restrictor probe system adapted for use in a magnetic restriction device according to claim 5, wherein: the outer surface of the fixing nut (4) is quadrilateral, and is matched with the quadrilateral hole in the rear section cylinder of the ceramic shell (3) in size, and after the fixing nut (4) is placed into the quadrilateral hole of the ceramic shell (3), the position is limited so that the fixing nut cannot rotate; the inside of the fixing nut (4) is provided with internal threads which are matched with external threads of the rear section of the copper connecting bolt (2), and after the fixing nut (4) is placed into a quadrilateral hole of the ceramic shell (3), the copper connecting bolt (2), the ceramic shell (3) and the fixing nut (4) can be fixed by rotating and tightening a middle-section nut of the copper connecting bolt (2).
7. The restrictor probe system adapted for use in a magnetic restriction device according to claim 5, wherein: the copper binding post (5) is a cylinder and is divided into a front section and a rear section, external threads are distributed on the front section cylinder and are matched with internal threads on the rear section of the copper connecting bolt (2), and the diameter of the front section cylinder is smaller than that of the rear section cylinder; the inside of the rear section cylinder is provided with a blind hole, and after the wire core of the lead (6) is inserted into the blind hole, the lead is tightly pressed by a wire pressing clamp, so that the copper binding post (5) and the lead (6) can be connected.
8. The restrictor probe system adapted for use in a magnetic restriction device according to claim 7, wherein: the wire (6) is a refractory wire, the center is a nickel-plated copper wire conductor, and the periphery is sequentially wrapped with glass fiber, a refractory mica tape and a glass fiber sintering layer from inside to outside.
9. The restrictor probe system adapted for use in a magnetic restriction device according to claim 5, wherein: the ceramic shell (3) is high-temperature sintered ceramic and is suitable for being used as a matrix of a probe; the ceramic shell (3) is in the shape of two sections of cylinders, the diameter of the front section of cylinder is larger than that of the rear section of cylinder, and the length of the front section of cylinder is shorter than that of the rear section of cylinder; the inside of the front section cylinder of the ceramic shell (3) is provided with a through hole, the aperture is larger than the outer diameter of the rear section of the copper connecting bolt (2) and smaller than the outer diameter of the middle section nut; a quadrilateral hole is formed in the rear section cylinder of the ceramic shell (3) and is used for placing and fixing the fixing nut (4); when the probe is installed, the front section cylinder of the ceramic shell (3) is inserted into the step hole of the chromium-zirconium-copper heat sink substrate (9) from the rear; the rear end cylinder is spaced from the threaded hole of the step hole, a spring washer (7) and a lock nut (8) are sequentially arranged in the rear end cylinder, the lock nut (8) is screwed, and the positions of the ceramic shell (3) and the probe assembly can be fixed; the surface of the lock nut (8) is an external thread and corresponds to a threaded hole in a stepped hole of the chromium-zirconium-copper heat sink substrate (9); the inside of the lock nut (8) is provided with a through hole, and the inner diameter of the lock nut is larger than the outer diameter of the rear section cylinder of the ceramic shell (3); two grooves are symmetrically formed in the bottom of the lock nut (8) so that the lock nut (8) can be screwed or unscrewed by using a tool.
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| CN114580217B (en) * | 2022-05-07 | 2022-07-26 | 西南交通大学 | Limiter for quasi-ring symmetric star simulator and design method thereof |
| CN117133482B (en) * | 2023-10-25 | 2024-02-13 | 陕西星环聚能科技有限公司 | Graphite tile limiter and fusion device |
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