A dual-coaxial crimped closed faraday probe

Abstract

The application provides a double-coaxial crimping type closed Faraday probe and relates to the technical field of electric propulsion.The collector member, the protection member and the support ring member are detachably connected through the threaded connection of the connecting nut on the threaded section of the collector member, the damaged or contaminated collector member and the protection member can be freely replaced, and the disassembly and assembly are more convenient.The ceramic ring is added between the collector and the protection ring to block the beam generated by the electric thruster from passing through the gap between the collector and the protection ring, and the ions on the side of the collector are eliminated.The wiring place is fully enclosed by the metal jacket, the probe does not collect the noise signal due to the exposure of the wiring place to the plasma environment, and the electric charge accumulation due to the exposure of the wiring does not cause the sparking with other metal objects in the experimental environment, the accuracy of the probe is improved, and the technical problems of the prior art, such as the complex assembly and disassembly of the traditional double-coaxial crimping type closed Faraday probe, the complex later maintenance and the inaccurate measured data, are solved.

Description

Technical Field

[0001] This invention relates to the field of electric propulsion technology, and in particular to a dual coaxial press-fit type sealed Faraday probe. Background Technology

[0002] Electric thrusters generate plasma by ionizing a working propellant and then use an electromagnetic field to accelerate the plasma to produce thrust. Compared to traditional chemical thrusters, they offer a higher specific impulse and significantly reduce the mass of the propellant required. Therefore, electric thrusters have shown great potential in missions requiring high total impulse, such as long-term orbit maintenance, lunar exploration, and deep space missions.

[0003] The discharge characteristics of electric thrusters are typically assessed using both contact and non-contact diagnostic techniques. Among these, the dual coaxial press-fit sealed Faraday probe, a contact diagnostic tool, is widely used to measure the ion current density in the plasma plume, thereby calculating key parameters of the electric thruster, such as ion current and beam divergence angle.

[0004] The working principle of the dual coaxial press-fit sealed Faraday probe is based on applying a negative bias voltage to repel electrons, enabling a planar collector to capture ions in the plume, thereby measuring the ion current density in a specific region. Its core components include a planar disk collector and a guard ring. To reduce secondary electron emission, the collector's front end is made of tungsten. The guard ring is a hollow cylinder made of metal, designed to shield against non-axial low-energy ions, ensuring the accuracy of the ion current density collected by the collector.

[0005] However, existing dual coaxial crimp-type sealed Faraday probes have the following problems:

[0006] 1. Currently, probes with simple shapes are relatively complex to assemble and disassemble, and their subsequent maintenance is also relatively complicated; while probes that are easier to assemble and disassemble are generally in the shape of a damaged cylinder, which has a large interference with the measurement field and poor electromagnetic shielding effect.

[0007] 2. The beam generated by the electric thruster may enter through the gap between the collector and the guard ring, causing the side of the guard ring to participate in ion collection. Although a correction factor can be used to correct this to some extent, it still cannot eliminate the problem of overestimating the measurement data.

[0008] 3. Existing dual coaxial crimp-type enclosed Faraday probe wiring mainly uses exposed wiring at the tail and side. These methods cannot avoid the collection of ions or electrons at the exposed wiring points, making the data measured by the dual coaxial crimp-type enclosed Faraday probe inaccurate and containing noise signals. Summary of the Invention

[0009] The purpose of this invention is to provide a dual coaxial crimp-type sealed Faraday probe, which alleviates the technical problems of complex assembly and disassembly, complex maintenance, and inaccurate measurement data of traditional dual coaxial crimp-type sealed Faraday probes in the prior art.

[0010] The present invention provides a dual coaxial press-fit type closed Faraday probe, comprising: a collector component, a protective component, a support ring component, a connecting nut, and a metal jacket;

[0011] One end of the collector component extends into the metal jacket, and the other end of the collector component extends out of the metal jacket and is detachably connected to the support ring component;

[0012] One end face of the support ring component is connected to the protective component, and the other end face of the support ring component extends into the metal jacket;

[0013] The portion of the collector component that extends into the metal jacket is provided with a threaded section, and the connecting nut is threadedly connected to the threaded section, and the connecting nut can abut against the end face of the support ring component;

[0014] The end face of the protective component facing the support ring component can fix a coaxial shielding wire, and the threaded section can fix another coaxial shielding wire.

[0015] In an optional implementation,

[0016] The collector component includes a collector front end and a collector rear end;

[0017] One end of the collector extends into the metal casing, and the other end of the collector extends out of the metal casing;

[0018] The front end of the collector and the rear end of the collector away from the metal casing are detachably connected.

[0019] In an optional implementation,

[0020] The collector rear end includes a first connecting part, a second connecting part, and a stepped part;

[0021] The two end faces of the stepped portion are respectively connected to the first connecting portion and the second connecting portion;

[0022] The threaded section is provided on the second connecting part;

[0023] The collector has a slot at its front end, into which the first connecting portion extends.

[0024] In an optional implementation,

[0025] The protective component includes a ceramic ring and a protective ring;

[0026] The protective ring is fitted onto the ceramic ring, and the end of the second connecting part extending out of the metal outer sleeve passes through the protective ring and the ceramic ring in sequence;

[0027] The stepped portion, the first connecting portion, and the front end of the collector are all disposed within the ceramic ring.

[0028] In an optional implementation,

[0029] The protective ring has a groove on its end face near the support ring component, and the groove is used to fix the coaxial shielded wire.

[0030] In an optional implementation,

[0031] The support ring component includes a cap brim and an insertion portion;

[0032] The brim and the insertion part are connected to each other. The brim is connected to the end face of the metal jacket, and the insertion part extends into the metal jacket.

[0033] In an optional implementation,

[0034] The ceramic ring has a first central hole, the protective ring has a second central hole, and the support ring component has a third central hole;

[0035] The second connecting portion passes through the third center hole, the second center hole, and the first center hole in sequence, in the direction of extending out of the metal jacket.

[0036] In an optional implementation,

[0037] The outer diameter of the stepped portion is larger than the diameter of the first central hole.

[0038] In an optional implementation,

[0039] The support ring component has a insertion hole, one end of which is open on the end face of the insertion part, and the other end of which is open on the end face of the cap brim part. The insertion hole is used for the coaxial shielded wire to pass through, so that the coaxial shielded wire passes through the insertion hole and extends into the groove.

[0040] In an optional implementation,

[0041] The metal jacket includes a cylindrical portion and an outlet portion;

[0042] The brim is connected to the end of the cylindrical portion, and the insertion portion extends into the cylindrical portion;

[0043] The outlet is connected to the end of the cylindrical part away from the brim. Two coaxial shielding wires inside the cylindrical part pass through the outlet and are sealed by heat shrink tubing.

[0044] The dual-coaxial press-fit sealed Faraday probe provided by this invention is threadedly connected to the threaded section of the collector component via a connecting nut, enabling detachable connection of the collector component, protective component, and support ring component. This allows for easy replacement of damaged or contaminated collector and protective components, making assembly and disassembly more convenient. A ceramic ring is added between the collector and the protective ring to block the beam generated by the electric thruster from passing through the gap between the collector and the protective ring, completely preventing ions from being collected from the side of the collector and improving measurement accuracy. Furthermore, a metal jacket completely seals the wiring joint, preventing the wires at the wiring joint from receiving escaped ion pairs and simultaneously shielding against electromagnetic interference. This prevents the collection of clutter signals due to the wiring joint being exposed to the plasma environment, and also prevents charge accumulation due to exposed wiring from causing arcing with other metal objects in the experimental environment, thus improving probe accuracy. This invention alleviates the technical problems of traditional dual-coaxial press-fit sealed Faraday probes in the prior art, which are complex to assemble and disassemble, have complex maintenance processes, and produce inaccurate data. Attached Figure Description

[0045] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0046] Figure 1 This is a cross-sectional view of the overall structure of the dual coaxial press-fit sealed Faraday probe provided in an embodiment of the present invention;

[0047] Figure 2 This is an exploded view of the overall structure of the dual coaxial crimped sealed Faraday probe provided in an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the overall structure of the dual coaxial crimped sealed Faraday probe provided in an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the collector front end in a dual coaxial press-fit sealed Faraday probe provided in an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the collector rear end of the dual coaxial press-fit sealed Faraday probe provided in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the ceramic ring structure in the dual coaxial press-fit sealed Faraday probe provided in an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of the protective ring in the dual coaxial press-fit closed Faraday probe provided in an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the support ring component in the dual coaxial press-fit closed Faraday probe provided in an embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the metal jacket structure in the dual coaxial crimped closed Faraday probe provided in an embodiment of the present invention.

[0055] Icons: 100-Collector component; 110-Collector front end; 111-Slot; 120-Collector rear end; 121-First connecting part; 122-Second connecting part; 123-Stepped part; 130-Threaded section; 200-Protective component; 210-Ceramic ring; 211-First center hole; 220-Protective ring; 221-Groove; 222-Second center hole; 300-Support ring component; 310-Cap edge; 320-Insertion part; 330-Third center hole; 340-Socket; 400-Connecting nut; 500-Metal jacket; 510-Cylindrical part; 520-Outlet part. Detailed Implementation

[0056] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0060] like Figure 1 , Figure 2 , Figure 3 As shown, the dual coaxial crimp-type enclosed Faraday probe provided in this embodiment includes: a collector component 100, a protective component 200, a support ring component 300, a connecting nut 400, and a metal jacket 500; one end of the collector component 100 extends into the metal jacket 500, which is the rear end, and the other end of the collector component 100 extends out of the metal jacket 500, which is the front end, and is detachably connected to the support ring component 300; one end face of the support ring component 300 is connected to the protective component 200, and the other end face of the support ring component 300 extends into the metal jacket 500; the portion of the collector component 100 extending into the metal jacket 500 is provided with a threaded section 130, and the connecting nut 400 is threadedly connected to the threaded section 130, and the connecting nut 400 can abut against the end face of the support ring component 300; the end face of the protective component 200 facing the support ring component 300 can fix one coaxial shielded wire, and the threaded section 130 can fix another coaxial shielded wire, realizing a dual coaxial fully enclosed connection.

[0061] The dual coaxial press-fit sealed Faraday probe provided in this embodiment is threadedly connected to the threaded section 130 of the collector component 100 via a connecting nut 400, enabling a detachable connection between the collector component 100, the protective component 200, and the support ring component 300. This allows for the free replacement of damaged or contaminated collector component 100 and protective component 200, making assembly and disassembly more convenient. Furthermore, the metal jacket 500 completely seals the wiring points, minimizing the impact of electromagnetic interference on diagnostic results. Simultaneously, it prevents the probe from collecting clutter signals due to the rear wiring points being exposed to the plasma environment, and also prevents charge accumulation from exposed wiring from causing arcing with other metal objects in the experimental environment. This improves the accuracy of the probe and alleviates the technical problems of complex assembly and disassembly, complex maintenance, and inaccurate data obtained by traditional dual coaxial press-fit sealed Faraday probes in the prior art.

[0062] Regarding the structure and shape of collector component 100, specifically:

[0063] like Figure 4 , Figure 5 As shown, the collector component 100 includes a collector front end 110 and a collector rear end 120; one end of the collector rear end 120 extends into the metal jacket 500, the other end of the collector rear end 120 extends out of the metal jacket 500, and the collector front end 110 and the end of the collector rear end 120 away from the metal jacket 500 are detachably connected.

[0064] Specifically, the collector rear end 120 includes a first connecting portion 121, a second connecting portion 122, and a stepped portion 123. The stepped portion 123 is located between the first connecting portion 121 and the second connecting portion 122. The outer diameter of the stepped portion 123 is larger than the outer diameters of both the first connecting portion 121 and the second connecting portion 122. The two end faces of the stepped portion 123 are connected to the first connecting portion 121 and the second connecting portion 122, respectively. The first connecting portion 121, the second connecting portion 122, and the stepped portion 123 are integrally formed. A threaded section 130 is provided on the second connecting portion 122.

[0065] The collector front end 110 has a slot 111, and a first connecting part 121 extends into the slot 111. The outer wall of the first connecting part 121 is in frictional engagement with the groove wall of the slot 111.

[0066] Regarding the structure and shape of the protective component 200, specifically:

[0067] like Figure 6 , Figure 7 As shown, the protective component 200 includes a ceramic ring 210 and a protective ring 220. The protective ring 220 is a cylindrical structure with one end open and the other end closed. The end near the support ring component 300 is a closed surface, and a second central hole 222 is opened in the center of the closed surface. The ceramic ring 210 has a similar shape to the protective ring 220. The ceramic ring 210 is placed inside the protective ring 220. The stepped portion 123, the first connecting portion 121, and the collector front end 110 are all disposed inside the ceramic ring 210. A first central hole 211 is opened in the center of the ceramic ring 210, and a third central hole 330 is opened in the center of the support ring component 300. The second connecting portion 122 passes through the third central hole 330, the second central hole 222, and the first central hole 211 in sequence in the direction of extending out of the metal jacket 500.

[0068] In an optional embodiment, the outer diameter of the step portion 123 is larger than the diameter of the first central hole 211, so that the step portion 123 cannot pass through the first central hole 211, thus restricting the movement direction of the step portion 123. The step surface is frictionally engaged with the groove wall of the ceramic ring 210, the outer wall of the collector front end 110 is frictionally engaged with the inner wall of the ceramic ring 210, and the outer wall of the ceramic ring 210 is frictionally engaged with the inner wall of the protective ring 220.

[0069] In an optional embodiment, a groove 221 is provided on the end face of the protective ring 220 near the support ring member 300. The groove 221 is annular and is used to fix the coaxial shielding wire. The coaxial shielding wire passing through the support ring member 300 is inserted into the groove 221 and ensures that the coaxial shielding wire does not exceed the end face of the protective ring 220 near the support ring member, thereby sealing the side of the probe.

[0070] The protective ring 220 is made of 304 stainless steel, the collector rear end 120 is made of copper, the collector front end 110 is made of tungsten or other high-melting-point metals, and the collector protective ring 220 is made of boron nitride ceramic.

[0071] Regarding the structure and shape of the support ring component 300, specifically:

[0072] like Figure 8 As shown, the support ring component 300 is made entirely of ceramic material. The support ring component 300 includes a brim portion 310 and an insertion portion 320. The brim portion 310 and the insertion portion 320 are connected to each other. The brim portion 310 is connected to the end face of the metal jacket 500. The insertion portion 320 extends into the metal jacket 500. The outer diameter of the brim portion 310 is larger than the inner diameter of the insertion portion 320, and the outer diameter of the brim portion 310 is larger than the inner diameter of the metal jacket 500, so that the brim portion 310 can overlap the end opening of the metal jacket 500.

[0073] The support ring component 300 is also provided with a socket 340. One end of the socket 340 is open on the end face of the insertion part 320, and the other end of the socket 340 is open on the end face of the cap rim part 310. That is, the socket 340 passes through the support ring component 300, and the socket 340 is arranged parallel to the third center hole 330. The socket 340 is used for the coaxial shielded wire to pass through, so that the coaxial shielded wire extends into the groove 221 after passing through the socket 340.

[0074] Regarding the structure and shape of the metal jacket 500, specifically:

[0075] like Figure 9As shown, the metal jacket 500 includes a cylindrical portion 510 and an outlet portion 520; the brim portion 310 is connected to the end of the cylindrical portion 510, the insertion portion 320 extends into the cylindrical portion 510, and the outlet portion 520 is connected to the end of the cylindrical portion 510 away from the brim portion 310. The outer diameter and inner diameter of the outlet portion 520 are both smaller than the outer diameter and inner diameter of the cylindrical portion 510. Two coaxial shielding wires inside the cylindrical portion 510 pass through the outlet portion 520, and the coaxial shielding wires passing through the outlet portion 520 are sealed by heat shrink tubing.

[0076] Based on the above, in general, the present invention uses coaxial coupling, with the collector rear end 120 as the axis, coaxially fitting the collector front end 110 at its front end, and sequentially fitting a ceramic ring 210, a protective ring 220, and a support ring component 300 at its rear end. The coaxial shielding wire is passed through the insertion hole 340, and the core wire is stripped out, wound around the ring, and inserted into the groove 221. Another coaxial shielding wire is wound around the threaded section 130 of the collector rear end 120. Then, a standard connecting nut 400 is used to press the entire front structure along the thread. The two coaxial shielding wires are passed through the tail outlet 520 of the metal jacket 500, and the cylindrical part 510 is fitted onto the cylindrical side of the support ring component 300. Finally, the coaxial shielding wire is sealed with heat shrink tubing after passing through the hole of the metal jacket 500 outlet 520.

[0077] The method for replacing the collector according to the present invention:

[0078] Remove the metal jacket 500, loosen the standard connecting nut 400 by hand, and pull out the support ring component 300, the protective ring 220, and the already connected coaxial shielded wire together. Remove the damaged or contaminated collector front end 110 and ceramic ring 210, and replace them with a new collector front end 110 and ceramic ring 210. Install the support ring component 300, the protective ring 220, and the already connected coaxial shielded wire assembly. Use the standard nut to tighten the entire front structure along the threads, put the metal jacket 500 back on, and use heat shrink tubing to seal the tail again.

[0079] How to use the dual coaxial crimp-type sealed Faraday probe of this invention:

[0080] 1. Complete the probe wiring and lead out using the wiring method described above. Connect the lead out to the circuit: Connect the protection ring 220 to a -30V bias voltage. A DC constant voltage power supply can be used for power supply. Connect the collector to the source meter. Set the source meter to apply a -30V bias voltage to the collector and be able to collect the current on the collector.

[0081] 2. Fix the dual coaxial crimped closed Faraday probe on the rotating platform, regard the thruster's central axis as 0 degrees, rotate and scan at a constant speed, and use a source meter to start collecting current and recording data.

[0082] To address the issue of cleanliness on the probe surface and ceramic surface, in this invention, the collector and other parts of the dual coaxial press-fit sealed Faraday probe are designed as separate structures to ensure convenient maintenance. If contamination, corrosion, or coverage is found on the front end 110 of the collector, or a metal deposition film is found on the support ring component 300, both can be directly replaced, greatly saving costs.

[0083] To improve the sealing of the probe, the present invention uses a metal shell to completely shield the wiring at the rear of the probe, and designs an outlet 520 with a tail shrink structure. After the probe is assembled, the wires should be sealed with heat shrink tubing after passing through the hole at the tail of the metal jacket 500, so that the wiring terminals are not exposed to the plasma environment.

[0084] The present invention creates a wiring groove 221 at the rear end of the protective ring 220 and simultaneously opens a hole in the support ring component 300, making the wiring a dual coaxial method. This results in the probe having a regular cylindrical shape in the plasma environment, which is simple in appearance and causes little damage to the plume field. The present invention uses a ceramic ring 210 to fill the gap between the collector and the protective ring 220, which physically isolates low-energy ions from entering the collector from the side, thereby improving the measurement accuracy.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual coaxial crimp-type sealed Faraday probe, characterized in that, include: Collector component (100), protective component (200), support ring component (300), connecting nut (400) and metal sleeve (500); One end of the collector component (100) extends into the metal jacket (500), and the other end of the collector component (100) extends out of the metal jacket (500) and is detachably connected to the support ring component (300); One end face of the support ring member (300) is connected to the protective member (200), and the other end face of the support ring member (300) extends into the metal jacket (500); The portion of the collector component (100) extending into the metal jacket (500) is provided with a threaded section (130), and the connecting nut (400) is threadedly connected to the threaded section (130). The connecting nut (400) can abut against the end face of the support ring component (300). The end face of the protective member (200) facing the support ring member (300) can fix a coaxial shielding wire, and the threaded section (130) can fix another coaxial shielding wire; The collector component (100) includes a collector front end (110) and a collector rear end (120). One end of the collector rear end (120) extends into the metal jacket (500), and the other end of the collector rear end (120) extends out of the metal jacket (500). The front end (110) of the collector and the rear end (120) of the collector away from the metal jacket (500) are detachably connected; The collector rear end (120) includes a first connecting part (121), a second connecting part (122), and a stepped part (123). The two end faces of the stepped portion (123) are respectively connected to the first connecting portion (121) and the second connecting portion (122); The protective component (200) includes a ceramic ring (210) and a protective ring (220). The protective ring (220) is sleeved on the ceramic ring (210), and the second connecting part (122) extends out of the metal outer sleeve (500) and passes through the protective ring (220) and the ceramic ring (210) in sequence. The protective ring (220) has a groove (221) on its end face near the support ring component (300), and the groove (221) is used to fix the coaxial shielded wire.

2. The dual coaxial crimp-type sealed Faraday probe according to claim 1, characterized in that, The threaded section (130) is provided on the second connecting part (122); The collector front end (110) has a slot (111) into which the first connecting part (121) extends.

3. The dual coaxial crimp-type sealed Faraday probe according to claim 2, characterized in that, The stepped portion (123), the first connecting portion (121), and the front end of the collector (110) are all disposed within the ceramic ring (210).

4. The dual coaxial crimp-type sealed Faraday probe according to claim 3, characterized in that, The support ring component (300) includes a brim portion (310) and an insertion portion (320). The brim (310) and the insertion part (320) are connected to each other. The brim (310) is connected to the end face of the metal cover (500). The insertion part (320) extends into the metal cover (500).

5. The dual coaxial crimp-type sealed Faraday probe according to claim 4, characterized in that, The ceramic ring (210) has a first central hole (211), the protective ring (220) has a second central hole (222), and the support ring member (300) has a third central hole (330). The second connecting part (122) passes through the third central hole (330), the second central hole (222) and the first central hole (211) in sequence in the direction of extending out of the metal jacket (500).

6. The dual coaxial crimp-type sealed Faraday probe according to claim 5, characterized in that, The outer diameter of the stepped portion (123) is larger than the diameter of the first central hole (211).

7. The dual coaxial crimp-type sealed Faraday probe according to claim 4, characterized in that, The support ring component (300) has a socket (340), one end of which is open on the end face of the insertion part (320), and the other end of which is open on the end face of the cap brim part (310). The socket (340) is used for the coaxial shielded wire to pass through, so that the coaxial shielded wire extends into the groove (221) after passing through the socket (340).

8. The dual coaxial crimp-type sealed Faraday probe according to claim 4, characterized in that, The metal jacket (500) includes a cylindrical portion (510) and an outlet portion (520). The brim portion (310) is connected to the end of the cylindrical portion (510), and the insertion portion (320) extends into the cylindrical portion (510); The outlet (520) is connected to the end of the cylindrical part (510) away from the brim (310). Two coaxial shielding wires inside the cylindrical part (510) pass through the outlet (520), and the coaxial shielding wires passing through the outlet (520) are sealed by heat shrink tubing.

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